Quota subsystem has more and more files. It's time to create a dir for it.
Signed-off-by: Jan Kara <jack@suse.cz>
source "fs/notify/Kconfig"
-config QUOTA
- bool "Quota support"
- help
- If you say Y here, you will be able to set per user limits for disk
- usage (also called disk quotas). Currently, it works for the
- ext2, ext3, and reiserfs file system. ext3 also supports journalled
- quotas for which you don't need to run quotacheck(8) after an unclean
- shutdown.
- For further details, read the Quota mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>, or the documentation provided
- with the quota tools. Probably the quota support is only useful for
- multi user systems. If unsure, say N.
-
-config QUOTA_NETLINK_INTERFACE
- bool "Report quota messages through netlink interface"
- depends on QUOTA && NET
- help
- If you say Y here, quota warnings (about exceeding softlimit, reaching
- hardlimit, etc.) will be reported through netlink interface. If unsure,
- say Y.
-
-config PRINT_QUOTA_WARNING
- bool "Print quota warnings to console (OBSOLETE)"
- depends on QUOTA
- default y
- help
- If you say Y here, quota warnings (about exceeding softlimit, reaching
- hardlimit, etc.) will be printed to the process' controlling terminal.
- Note that this behavior is currently deprecated and may go away in
- future. Please use notification via netlink socket instead.
-
-# Generic support for tree structured quota files. Seleted when needed.
-config QUOTA_TREE
- tristate
-
-config QFMT_V1
- tristate "Old quota format support"
- depends on QUOTA
- help
- This quota format was (is) used by kernels earlier than 2.4.22. If
- you have quota working and you don't want to convert to new quota
- format say Y here.
-
-config QFMT_V2
- tristate "Quota format v2 support"
- depends on QUOTA
- select QUOTA_TREE
- help
- This quota format allows using quotas with 32-bit UIDs/GIDs. If you
- need this functionality say Y here.
-
-config QUOTACTL
- bool
- depends on XFS_QUOTA || QUOTA
- default y
+source "fs/quota/Kconfig"
source "fs/autofs/Kconfig"
source "fs/autofs4/Kconfig"
obj-$(CONFIG_NFS_COMMON) += nfs_common/
obj-$(CONFIG_GENERIC_ACL) += generic_acl.o
-obj-$(CONFIG_QUOTA) += dquot.o
-obj-$(CONFIG_QFMT_V1) += quota_v1.o
-obj-$(CONFIG_QFMT_V2) += quota_v2.o
-obj-$(CONFIG_QUOTA_TREE) += quota_tree.o
-obj-$(CONFIG_QUOTACTL) += quota.o
+obj-y += quota/
obj-$(CONFIG_PROC_FS) += proc/
obj-y += partitions/
+++ /dev/null
-/*
- * Implementation of the diskquota system for the LINUX operating system. QUOTA
- * is implemented using the BSD system call interface as the means of
- * communication with the user level. This file contains the generic routines
- * called by the different filesystems on allocation of an inode or block.
- * These routines take care of the administration needed to have a consistent
- * diskquota tracking system. The ideas of both user and group quotas are based
- * on the Melbourne quota system as used on BSD derived systems. The internal
- * implementation is based on one of the several variants of the LINUX
- * inode-subsystem with added complexity of the diskquota system.
- *
- * Author: Marco van Wieringen <mvw@planets.elm.net>
- *
- * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
- *
- * Revised list management to avoid races
- * -- Bill Hawes, <whawes@star.net>, 9/98
- *
- * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
- * As the consequence the locking was moved from dquot_decr_...(),
- * dquot_incr_...() to calling functions.
- * invalidate_dquots() now writes modified dquots.
- * Serialized quota_off() and quota_on() for mount point.
- * Fixed a few bugs in grow_dquots().
- * Fixed deadlock in write_dquot() - we no longer account quotas on
- * quota files
- * remove_dquot_ref() moved to inode.c - it now traverses through inodes
- * add_dquot_ref() restarts after blocking
- * Added check for bogus uid and fixed check for group in quotactl.
- * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
- *
- * Used struct list_head instead of own list struct
- * Invalidation of referenced dquots is no longer possible
- * Improved free_dquots list management
- * Quota and i_blocks are now updated in one place to avoid races
- * Warnings are now delayed so we won't block in critical section
- * Write updated not to require dquot lock
- * Jan Kara, <jack@suse.cz>, 9/2000
- *
- * Added dynamic quota structure allocation
- * Jan Kara <jack@suse.cz> 12/2000
- *
- * Rewritten quota interface. Implemented new quota format and
- * formats registering.
- * Jan Kara, <jack@suse.cz>, 2001,2002
- *
- * New SMP locking.
- * Jan Kara, <jack@suse.cz>, 10/2002
- *
- * Added journalled quota support, fix lock inversion problems
- * Jan Kara, <jack@suse.cz>, 2003,2004
- *
- * (C) Copyright 1994 - 1997 Marco van Wieringen
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/mm.h>
-#include <linux/time.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-#include <linux/sysctl.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/kmod.h>
-#include <linux/namei.h>
-#include <linux/buffer_head.h>
-#include <linux/capability.h>
-#include <linux/quotaops.h>
-#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-#include <net/netlink.h>
-#include <net/genetlink.h>
-#endif
-
-#include <asm/uaccess.h>
-
-#define __DQUOT_PARANOIA
-
-/*
- * There are three quota SMP locks. dq_list_lock protects all lists with quotas
- * and quota formats, dqstats structure containing statistics about the lists
- * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
- * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
- * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
- * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
- * modifications of quota state (on quotaon and quotaoff) and readers who care
- * about latest values take it as well.
- *
- * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
- * dq_list_lock > dq_state_lock
- *
- * Note that some things (eg. sb pointer, type, id) doesn't change during
- * the life of the dquot structure and so needn't to be protected by a lock
- *
- * Any operation working on dquots via inode pointers must hold dqptr_sem. If
- * operation is just reading pointers from inode (or not using them at all) the
- * read lock is enough. If pointers are altered function must hold write lock
- * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
- * for altering the flag i_mutex is also needed).
- *
- * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
- * from inodes (dquot_alloc_space() and such don't check the dq_lock).
- * Currently dquot is locked only when it is being read to memory (or space for
- * it is being allocated) on the first dqget() and when it is being released on
- * the last dqput(). The allocation and release oparations are serialized by
- * the dq_lock and by checking the use count in dquot_release(). Write
- * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
- * spinlock to internal buffers before writing.
- *
- * Lock ordering (including related VFS locks) is the following:
- * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
- * dqio_mutex
- * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
- * dqptr_sem. But filesystem has to count with the fact that functions such as
- * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
- * from inside a transaction to keep filesystem consistency after a crash. Also
- * filesystems usually want to do some IO on dquot from ->mark_dirty which is
- * called with dqptr_sem held.
- * i_mutex on quota files is special (it's below dqio_mutex)
- */
-
-static DEFINE_SPINLOCK(dq_list_lock);
-static DEFINE_SPINLOCK(dq_state_lock);
-DEFINE_SPINLOCK(dq_data_lock);
-EXPORT_SYMBOL(dq_data_lock);
-
-static char *quotatypes[] = INITQFNAMES;
-static struct quota_format_type *quota_formats; /* List of registered formats */
-static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
-
-/* SLAB cache for dquot structures */
-static struct kmem_cache *dquot_cachep;
-
-int register_quota_format(struct quota_format_type *fmt)
-{
- spin_lock(&dq_list_lock);
- fmt->qf_next = quota_formats;
- quota_formats = fmt;
- spin_unlock(&dq_list_lock);
- return 0;
-}
-EXPORT_SYMBOL(register_quota_format);
-
-void unregister_quota_format(struct quota_format_type *fmt)
-{
- struct quota_format_type **actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
- if (*actqf)
- *actqf = (*actqf)->qf_next;
- spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(unregister_quota_format);
-
-static struct quota_format_type *find_quota_format(int id)
-{
- struct quota_format_type *actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
- if (!actqf || !try_module_get(actqf->qf_owner)) {
- int qm;
-
- spin_unlock(&dq_list_lock);
-
- for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
- if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
- return NULL;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
- if (actqf && !try_module_get(actqf->qf_owner))
- actqf = NULL;
- }
- spin_unlock(&dq_list_lock);
- return actqf;
-}
-
-static void put_quota_format(struct quota_format_type *fmt)
-{
- module_put(fmt->qf_owner);
-}
-
-/*
- * Dquot List Management:
- * The quota code uses three lists for dquot management: the inuse_list,
- * free_dquots, and dquot_hash[] array. A single dquot structure may be
- * on all three lists, depending on its current state.
- *
- * All dquots are placed to the end of inuse_list when first created, and this
- * list is used for invalidate operation, which must look at every dquot.
- *
- * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
- * and this list is searched whenever we need an available dquot. Dquots are
- * removed from the list as soon as they are used again, and
- * dqstats.free_dquots gives the number of dquots on the list. When
- * dquot is invalidated it's completely released from memory.
- *
- * Dquots with a specific identity (device, type and id) are placed on
- * one of the dquot_hash[] hash chains. The provides an efficient search
- * mechanism to locate a specific dquot.
- */
-
-static LIST_HEAD(inuse_list);
-static LIST_HEAD(free_dquots);
-static unsigned int dq_hash_bits, dq_hash_mask;
-static struct hlist_head *dquot_hash;
-
-struct dqstats dqstats;
-EXPORT_SYMBOL(dqstats);
-
-static inline unsigned int
-hashfn(const struct super_block *sb, unsigned int id, int type)
-{
- unsigned long tmp;
-
- tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
- return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
-}
-
-/*
- * Following list functions expect dq_list_lock to be held
- */
-static inline void insert_dquot_hash(struct dquot *dquot)
-{
- struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
- hlist_add_head(&dquot->dq_hash, head);
-}
-
-static inline void remove_dquot_hash(struct dquot *dquot)
-{
- hlist_del_init(&dquot->dq_hash);
-}
-
-static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
-{
- struct hlist_node *node;
- struct dquot *dquot;
-
- hlist_for_each (node, dquot_hash+hashent) {
- dquot = hlist_entry(node, struct dquot, dq_hash);
- if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
- return dquot;
- }
- return NODQUOT;
-}
-
-/* Add a dquot to the tail of the free list */
-static inline void put_dquot_last(struct dquot *dquot)
-{
- list_add_tail(&dquot->dq_free, &free_dquots);
- dqstats.free_dquots++;
-}
-
-static inline void remove_free_dquot(struct dquot *dquot)
-{
- if (list_empty(&dquot->dq_free))
- return;
- list_del_init(&dquot->dq_free);
- dqstats.free_dquots--;
-}
-
-static inline void put_inuse(struct dquot *dquot)
-{
- /* We add to the back of inuse list so we don't have to restart
- * when traversing this list and we block */
- list_add_tail(&dquot->dq_inuse, &inuse_list);
- dqstats.allocated_dquots++;
-}
-
-static inline void remove_inuse(struct dquot *dquot)
-{
- dqstats.allocated_dquots--;
- list_del(&dquot->dq_inuse);
-}
-/*
- * End of list functions needing dq_list_lock
- */
-
-static void wait_on_dquot(struct dquot *dquot)
-{
- mutex_lock(&dquot->dq_lock);
- mutex_unlock(&dquot->dq_lock);
-}
-
-static inline int dquot_dirty(struct dquot *dquot)
-{
- return test_bit(DQ_MOD_B, &dquot->dq_flags);
-}
-
-static inline int mark_dquot_dirty(struct dquot *dquot)
-{
- return dquot->dq_sb->dq_op->mark_dirty(dquot);
-}
-
-int dquot_mark_dquot_dirty(struct dquot *dquot)
-{
- spin_lock(&dq_list_lock);
- if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
- list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
- info[dquot->dq_type].dqi_dirty_list);
- spin_unlock(&dq_list_lock);
- return 0;
-}
-EXPORT_SYMBOL(dquot_mark_dquot_dirty);
-
-/* This function needs dq_list_lock */
-static inline int clear_dquot_dirty(struct dquot *dquot)
-{
- if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
- return 0;
- list_del_init(&dquot->dq_dirty);
- return 1;
-}
-
-void mark_info_dirty(struct super_block *sb, int type)
-{
- set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
-}
-EXPORT_SYMBOL(mark_info_dirty);
-
-/*
- * Read dquot from disk and alloc space for it
- */
-
-int dquot_acquire(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- mutex_lock(&dqopt->dqio_mutex);
- if (!test_bit(DQ_READ_B, &dquot->dq_flags))
- ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
- if (ret < 0)
- goto out_iolock;
- set_bit(DQ_READ_B, &dquot->dq_flags);
- /* Instantiate dquot if needed */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- /* Write the info if needed */
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret < 0)
- goto out_iolock;
- if (ret2 < 0) {
- ret = ret2;
- goto out_iolock;
- }
- }
- set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-out_iolock:
- mutex_unlock(&dqopt->dqio_mutex);
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_acquire);
-
-/*
- * Write dquot to disk
- */
-int dquot_commit(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dqopt->dqio_mutex);
- spin_lock(&dq_list_lock);
- if (!clear_dquot_dirty(dquot)) {
- spin_unlock(&dq_list_lock);
- goto out_sem;
- }
- spin_unlock(&dq_list_lock);
- /* Inactive dquot can be only if there was error during read/init
- * => we have better not writing it */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret >= 0)
- ret = ret2;
- }
-out_sem:
- mutex_unlock(&dqopt->dqio_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_commit);
-
-/*
- * Release dquot
- */
-int dquot_release(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- /* Check whether we are not racing with some other dqget() */
- if (atomic_read(&dquot->dq_count) > 1)
- goto out_dqlock;
- mutex_lock(&dqopt->dqio_mutex);
- if (dqopt->ops[dquot->dq_type]->release_dqblk) {
- ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
- /* Write the info */
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret >= 0)
- ret = ret2;
- }
- clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
- mutex_unlock(&dqopt->dqio_mutex);
-out_dqlock:
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_release);
-
-void dquot_destroy(struct dquot *dquot)
-{
- kmem_cache_free(dquot_cachep, dquot);
-}
-EXPORT_SYMBOL(dquot_destroy);
-
-static inline void do_destroy_dquot(struct dquot *dquot)
-{
- dquot->dq_sb->dq_op->destroy_dquot(dquot);
-}
-
-/* Invalidate all dquots on the list. Note that this function is called after
- * quota is disabled and pointers from inodes removed so there cannot be new
- * quota users. There can still be some users of quotas due to inodes being
- * just deleted or pruned by prune_icache() (those are not attached to any
- * list) or parallel quotactl call. We have to wait for such users.
- */
-static void invalidate_dquots(struct super_block *sb, int type)
-{
- struct dquot *dquot, *tmp;
-
-restart:
- spin_lock(&dq_list_lock);
- list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
- if (dquot->dq_sb != sb)
- continue;
- if (dquot->dq_type != type)
- continue;
- /* Wait for dquot users */
- if (atomic_read(&dquot->dq_count)) {
- DEFINE_WAIT(wait);
-
- atomic_inc(&dquot->dq_count);
- prepare_to_wait(&dquot->dq_wait_unused, &wait,
- TASK_UNINTERRUPTIBLE);
- spin_unlock(&dq_list_lock);
- /* Once dqput() wakes us up, we know it's time to free
- * the dquot.
- * IMPORTANT: we rely on the fact that there is always
- * at most one process waiting for dquot to free.
- * Otherwise dq_count would be > 1 and we would never
- * wake up.
- */
- if (atomic_read(&dquot->dq_count) > 1)
- schedule();
- finish_wait(&dquot->dq_wait_unused, &wait);
- dqput(dquot);
- /* At this moment dquot() need not exist (it could be
- * reclaimed by prune_dqcache(). Hence we must
- * restart. */
- goto restart;
- }
- /*
- * Quota now has no users and it has been written on last
- * dqput()
- */
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- }
- spin_unlock(&dq_list_lock);
-}
-
-/* Call callback for every active dquot on given filesystem */
-int dquot_scan_active(struct super_block *sb,
- int (*fn)(struct dquot *dquot, unsigned long priv),
- unsigned long priv)
-{
- struct dquot *dquot, *old_dquot = NULL;
- int ret = 0;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- spin_lock(&dq_list_lock);
- list_for_each_entry(dquot, &inuse_list, dq_inuse) {
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
- continue;
- if (dquot->dq_sb != sb)
- continue;
- /* Now we have active dquot so we can just increase use count */
- atomic_inc(&dquot->dq_count);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- dqput(old_dquot);
- old_dquot = dquot;
- ret = fn(dquot, priv);
- if (ret < 0)
- goto out;
- spin_lock(&dq_list_lock);
- /* We are safe to continue now because our dquot could not
- * be moved out of the inuse list while we hold the reference */
- }
- spin_unlock(&dq_list_lock);
-out:
- dqput(old_dquot);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_scan_active);
-
-int vfs_quota_sync(struct super_block *sb, int type)
-{
- struct list_head *dirty;
- struct dquot *dquot;
- struct quota_info *dqopt = sb_dqopt(sb);
- int cnt;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- spin_lock(&dq_list_lock);
- dirty = &dqopt->info[cnt].dqi_dirty_list;
- while (!list_empty(dirty)) {
- dquot = list_first_entry(dirty, struct dquot, dq_dirty);
- /* Dirty and inactive can be only bad dquot... */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- clear_dquot_dirty(dquot);
- continue;
- }
- /* Now we have active dquot from which someone is
- * holding reference so we can safely just increase
- * use count */
- atomic_inc(&dquot->dq_count);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- sb->dq_op->write_dquot(dquot);
- dqput(dquot);
- spin_lock(&dq_list_lock);
- }
- spin_unlock(&dq_list_lock);
- }
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
- && info_dirty(&dqopt->info[cnt]))
- sb->dq_op->write_info(sb, cnt);
- spin_lock(&dq_list_lock);
- dqstats.syncs++;
- spin_unlock(&dq_list_lock);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- return 0;
-}
-EXPORT_SYMBOL(vfs_quota_sync);
-
-/* Free unused dquots from cache */
-static void prune_dqcache(int count)
-{
- struct list_head *head;
- struct dquot *dquot;
-
- head = free_dquots.prev;
- while (head != &free_dquots && count) {
- dquot = list_entry(head, struct dquot, dq_free);
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- count--;
- head = free_dquots.prev;
- }
-}
-
-/*
- * This is called from kswapd when we think we need some
- * more memory
- */
-
-static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
-{
- if (nr) {
- spin_lock(&dq_list_lock);
- prune_dqcache(nr);
- spin_unlock(&dq_list_lock);
- }
- return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
-}
-
-static struct shrinker dqcache_shrinker = {
- .shrink = shrink_dqcache_memory,
- .seeks = DEFAULT_SEEKS,
-};
-
-/*
- * Put reference to dquot
- * NOTE: If you change this function please check whether dqput_blocks() works right...
- */
-void dqput(struct dquot *dquot)
-{
- int ret;
-
- if (!dquot)
- return;
-#ifdef __DQUOT_PARANOIA
- if (!atomic_read(&dquot->dq_count)) {
- printk("VFS: dqput: trying to free free dquot\n");
- printk("VFS: device %s, dquot of %s %d\n",
- dquot->dq_sb->s_id,
- quotatypes[dquot->dq_type],
- dquot->dq_id);
- BUG();
- }
-#endif
-
- spin_lock(&dq_list_lock);
- dqstats.drops++;
- spin_unlock(&dq_list_lock);
-we_slept:
- spin_lock(&dq_list_lock);
- if (atomic_read(&dquot->dq_count) > 1) {
- /* We have more than one user... nothing to do */
- atomic_dec(&dquot->dq_count);
- /* Releasing dquot during quotaoff phase? */
- if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
- atomic_read(&dquot->dq_count) == 1)
- wake_up(&dquot->dq_wait_unused);
- spin_unlock(&dq_list_lock);
- return;
- }
- /* Need to release dquot? */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
- spin_unlock(&dq_list_lock);
- /* Commit dquot before releasing */
- ret = dquot->dq_sb->dq_op->write_dquot(dquot);
- if (ret < 0) {
- printk(KERN_ERR "VFS: cannot write quota structure on "
- "device %s (error %d). Quota may get out of "
- "sync!\n", dquot->dq_sb->s_id, ret);
- /*
- * We clear dirty bit anyway, so that we avoid
- * infinite loop here
- */
- spin_lock(&dq_list_lock);
- clear_dquot_dirty(dquot);
- spin_unlock(&dq_list_lock);
- }
- goto we_slept;
- }
- /* Clear flag in case dquot was inactive (something bad happened) */
- clear_dquot_dirty(dquot);
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- spin_unlock(&dq_list_lock);
- dquot->dq_sb->dq_op->release_dquot(dquot);
- goto we_slept;
- }
- atomic_dec(&dquot->dq_count);
-#ifdef __DQUOT_PARANOIA
- /* sanity check */
- BUG_ON(!list_empty(&dquot->dq_free));
-#endif
- put_dquot_last(dquot);
- spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(dqput);
-
-struct dquot *dquot_alloc(struct super_block *sb, int type)
-{
- return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
-}
-EXPORT_SYMBOL(dquot_alloc);
-
-static struct dquot *get_empty_dquot(struct super_block *sb, int type)
-{
- struct dquot *dquot;
-
- dquot = sb->dq_op->alloc_dquot(sb, type);
- if(!dquot)
- return NODQUOT;
-
- mutex_init(&dquot->dq_lock);
- INIT_LIST_HEAD(&dquot->dq_free);
- INIT_LIST_HEAD(&dquot->dq_inuse);
- INIT_HLIST_NODE(&dquot->dq_hash);
- INIT_LIST_HEAD(&dquot->dq_dirty);
- init_waitqueue_head(&dquot->dq_wait_unused);
- dquot->dq_sb = sb;
- dquot->dq_type = type;
- atomic_set(&dquot->dq_count, 1);
-
- return dquot;
-}
-
-/*
- * Get reference to dquot
- *
- * Locking is slightly tricky here. We are guarded from parallel quotaoff()
- * destroying our dquot by:
- * a) checking for quota flags under dq_list_lock and
- * b) getting a reference to dquot before we release dq_list_lock
- */
-struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
-{
- unsigned int hashent = hashfn(sb, id, type);
- struct dquot *dquot = NODQUOT, *empty = NODQUOT;
-
- if (!sb_has_quota_active(sb, type))
- return NODQUOT;
-we_slept:
- spin_lock(&dq_list_lock);
- spin_lock(&dq_state_lock);
- if (!sb_has_quota_active(sb, type)) {
- spin_unlock(&dq_state_lock);
- spin_unlock(&dq_list_lock);
- goto out;
- }
- spin_unlock(&dq_state_lock);
-
- if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
- if (empty == NODQUOT) {
- spin_unlock(&dq_list_lock);
- if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
- schedule(); /* Try to wait for a moment... */
- goto we_slept;
- }
- dquot = empty;
- empty = NODQUOT;
- dquot->dq_id = id;
- /* all dquots go on the inuse_list */
- put_inuse(dquot);
- /* hash it first so it can be found */
- insert_dquot_hash(dquot);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- } else {
- if (!atomic_read(&dquot->dq_count))
- remove_free_dquot(dquot);
- atomic_inc(&dquot->dq_count);
- dqstats.cache_hits++;
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- }
- /* Wait for dq_lock - after this we know that either dquot_release() is already
- * finished or it will be canceled due to dq_count > 1 test */
- wait_on_dquot(dquot);
- /* Read the dquot and instantiate it (everything done only if needed) */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
- dqput(dquot);
- dquot = NODQUOT;
- goto out;
- }
-#ifdef __DQUOT_PARANOIA
- BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
-#endif
-out:
- if (empty)
- do_destroy_dquot(empty);
-
- return dquot;
-}
-EXPORT_SYMBOL(dqget);
-
-static int dqinit_needed(struct inode *inode, int type)
-{
- int cnt;
-
- if (IS_NOQUOTA(inode))
- return 0;
- if (type != -1)
- return inode->i_dquot[type] == NODQUOT;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt] == NODQUOT)
- return 1;
- return 0;
-}
-
-/* This routine is guarded by dqonoff_mutex mutex */
-static void add_dquot_ref(struct super_block *sb, int type)
-{
- struct inode *inode, *old_inode = NULL;
-
- spin_lock(&inode_lock);
- list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
- if (!atomic_read(&inode->i_writecount))
- continue;
- if (!dqinit_needed(inode, type))
- continue;
- if (inode->i_state & (I_FREEING|I_WILL_FREE))
- continue;
-
- __iget(inode);
- spin_unlock(&inode_lock);
-
- iput(old_inode);
- sb->dq_op->initialize(inode, type);
- /* We hold a reference to 'inode' so it couldn't have been
- * removed from s_inodes list while we dropped the inode_lock.
- * We cannot iput the inode now as we can be holding the last
- * reference and we cannot iput it under inode_lock. So we
- * keep the reference and iput it later. */
- old_inode = inode;
- spin_lock(&inode_lock);
- }
- spin_unlock(&inode_lock);
- iput(old_inode);
-}
-
-/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
-static inline int dqput_blocks(struct dquot *dquot)
-{
- if (atomic_read(&dquot->dq_count) <= 1)
- return 1;
- return 0;
-}
-
-/* Remove references to dquots from inode - add dquot to list for freeing if needed */
-/* We can't race with anybody because we hold dqptr_sem for writing... */
-static int remove_inode_dquot_ref(struct inode *inode, int type,
- struct list_head *tofree_head)
-{
- struct dquot *dquot = inode->i_dquot[type];
-
- inode->i_dquot[type] = NODQUOT;
- if (dquot != NODQUOT) {
- if (dqput_blocks(dquot)) {
-#ifdef __DQUOT_PARANOIA
- if (atomic_read(&dquot->dq_count) != 1)
- printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
-#endif
- spin_lock(&dq_list_lock);
- list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
- spin_unlock(&dq_list_lock);
- return 1;
- }
- else
- dqput(dquot); /* We have guaranteed we won't block */
- }
- return 0;
-}
-
-/* Free list of dquots - called from inode.c */
-/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
-static void put_dquot_list(struct list_head *tofree_head)
-{
- struct list_head *act_head;
- struct dquot *dquot;
-
- act_head = tofree_head->next;
- /* So now we have dquots on the list... Just free them */
- while (act_head != tofree_head) {
- dquot = list_entry(act_head, struct dquot, dq_free);
- act_head = act_head->next;
- list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
- dqput(dquot);
- }
-}
-
-static void remove_dquot_ref(struct super_block *sb, int type,
- struct list_head *tofree_head)
-{
- struct inode *inode;
-
- spin_lock(&inode_lock);
- list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
- if (!IS_NOQUOTA(inode))
- remove_inode_dquot_ref(inode, type, tofree_head);
- }
- spin_unlock(&inode_lock);
-}
-
-/* Gather all references from inodes and drop them */
-static void drop_dquot_ref(struct super_block *sb, int type)
-{
- LIST_HEAD(tofree_head);
-
- if (sb->dq_op) {
- down_write(&sb_dqopt(sb)->dqptr_sem);
- remove_dquot_ref(sb, type, &tofree_head);
- up_write(&sb_dqopt(sb)->dqptr_sem);
- put_dquot_list(&tofree_head);
- }
-}
-
-static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curinodes += number;
-}
-
-static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curspace += number;
-}
-
-static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_rsvspace += number;
-}
-
-/*
- * Claim reserved quota space
- */
-static void dquot_claim_reserved_space(struct dquot *dquot,
- qsize_t number)
-{
- WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
- dquot->dq_dqb.dqb_curspace += number;
- dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline
-void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
-{
- if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
- dquot->dq_dqb.dqb_curinodes >= number)
- dquot->dq_dqb.dqb_curinodes -= number;
- else
- dquot->dq_dqb.dqb_curinodes = 0;
- if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
- dquot->dq_dqb.dqb_itime = (time_t) 0;
- clear_bit(DQ_INODES_B, &dquot->dq_flags);
-}
-
-static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
-{
- if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
- dquot->dq_dqb.dqb_curspace >= number)
- dquot->dq_dqb.dqb_curspace -= number;
- else
- dquot->dq_dqb.dqb_curspace = 0;
- if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
- dquot->dq_dqb.dqb_btime = (time_t) 0;
- clear_bit(DQ_BLKS_B, &dquot->dq_flags);
-}
-
-static int warning_issued(struct dquot *dquot, const int warntype)
-{
- int flag = (warntype == QUOTA_NL_BHARDWARN ||
- warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
- ((warntype == QUOTA_NL_IHARDWARN ||
- warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
-
- if (!flag)
- return 0;
- return test_and_set_bit(flag, &dquot->dq_flags);
-}
-
-#ifdef CONFIG_PRINT_QUOTA_WARNING
-static int flag_print_warnings = 1;
-
-static inline int need_print_warning(struct dquot *dquot)
-{
- if (!flag_print_warnings)
- return 0;
-
- switch (dquot->dq_type) {
- case USRQUOTA:
- return current_fsuid() == dquot->dq_id;
- case GRPQUOTA:
- return in_group_p(dquot->dq_id);
- }
- return 0;
-}
-
-/* Print warning to user which exceeded quota */
-static void print_warning(struct dquot *dquot, const int warntype)
-{
- char *msg = NULL;
- struct tty_struct *tty;
-
- if (warntype == QUOTA_NL_IHARDBELOW ||
- warntype == QUOTA_NL_ISOFTBELOW ||
- warntype == QUOTA_NL_BHARDBELOW ||
- warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
- return;
-
- tty = get_current_tty();
- if (!tty)
- return;
- tty_write_message(tty, dquot->dq_sb->s_id);
- if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
- tty_write_message(tty, ": warning, ");
- else
- tty_write_message(tty, ": write failed, ");
- tty_write_message(tty, quotatypes[dquot->dq_type]);
- switch (warntype) {
- case QUOTA_NL_IHARDWARN:
- msg = " file limit reached.\r\n";
- break;
- case QUOTA_NL_ISOFTLONGWARN:
- msg = " file quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_ISOFTWARN:
- msg = " file quota exceeded.\r\n";
- break;
- case QUOTA_NL_BHARDWARN:
- msg = " block limit reached.\r\n";
- break;
- case QUOTA_NL_BSOFTLONGWARN:
- msg = " block quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_BSOFTWARN:
- msg = " block quota exceeded.\r\n";
- break;
- }
- tty_write_message(tty, msg);
- tty_kref_put(tty);
-}
-#endif
-
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-
-/* Netlink family structure for quota */
-static struct genl_family quota_genl_family = {
- .id = GENL_ID_GENERATE,
- .hdrsize = 0,
- .name = "VFS_DQUOT",
- .version = 1,
- .maxattr = QUOTA_NL_A_MAX,
-};
-
-/* Send warning to userspace about user which exceeded quota */
-static void send_warning(const struct dquot *dquot, const char warntype)
-{
- static atomic_t seq;
- struct sk_buff *skb;
- void *msg_head;
- int ret;
- int msg_size = 4 * nla_total_size(sizeof(u32)) +
- 2 * nla_total_size(sizeof(u64));
-
- /* We have to allocate using GFP_NOFS as we are called from a
- * filesystem performing write and thus further recursion into
- * the fs to free some data could cause deadlocks. */
- skb = genlmsg_new(msg_size, GFP_NOFS);
- if (!skb) {
- printk(KERN_ERR
- "VFS: Not enough memory to send quota warning.\n");
- return;
- }
- msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
- "a_genl_family, 0, QUOTA_NL_C_WARNING);
- if (!msg_head) {
- printk(KERN_ERR
- "VFS: Cannot store netlink header in quota warning.\n");
- goto err_out;
- }
- ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
- MAJOR(dquot->dq_sb->s_dev));
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
- MINOR(dquot->dq_sb->s_dev));
- if (ret)
- goto attr_err_out;
- ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
- if (ret)
- goto attr_err_out;
- genlmsg_end(skb, msg_head);
-
- ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
- if (ret < 0 && ret != -ESRCH)
- printk(KERN_ERR
- "VFS: Failed to send notification message: %d\n", ret);
- return;
-attr_err_out:
- printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
-err_out:
- kfree_skb(skb);
-}
-#endif
-/*
- * Write warnings to the console and send warning messages over netlink.
- *
- * Note that this function can sleep.
- */
-static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
-{
- int i;
-
- for (i = 0; i < MAXQUOTAS; i++)
- if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
- !warning_issued(dquots[i], warntype[i])) {
-#ifdef CONFIG_PRINT_QUOTA_WARNING
- print_warning(dquots[i], warntype[i]);
-#endif
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
- send_warning(dquots[i], warntype[i]);
-#endif
- }
-}
-
-static inline char ignore_hardlimit(struct dquot *dquot)
-{
- struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
-
- return capable(CAP_SYS_RESOURCE) &&
- (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
-}
-
-/* needs dq_data_lock */
-static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
-{
- *warntype = QUOTA_NL_NOWARN;
- if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
- test_bit(DQ_FAKE_B, &dquot->dq_flags))
- return QUOTA_OK;
-
- if (dquot->dq_dqb.dqb_ihardlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
- !ignore_hardlimit(dquot)) {
- *warntype = QUOTA_NL_IHARDWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_isoftlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
- dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
- !ignore_hardlimit(dquot)) {
- *warntype = QUOTA_NL_ISOFTLONGWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_isoftlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
- dquot->dq_dqb.dqb_itime == 0) {
- *warntype = QUOTA_NL_ISOFTWARN;
- dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
- }
-
- return QUOTA_OK;
-}
-
-/* needs dq_data_lock */
-static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
-{
- qsize_t tspace;
-
- *warntype = QUOTA_NL_NOWARN;
- if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
- test_bit(DQ_FAKE_B, &dquot->dq_flags))
- return QUOTA_OK;
-
- tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
- + space;
-
- if (dquot->dq_dqb.dqb_bhardlimit &&
- tspace > dquot->dq_dqb.dqb_bhardlimit &&
- !ignore_hardlimit(dquot)) {
- if (!prealloc)
- *warntype = QUOTA_NL_BHARDWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_bsoftlimit &&
- tspace > dquot->dq_dqb.dqb_bsoftlimit &&
- dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
- !ignore_hardlimit(dquot)) {
- if (!prealloc)
- *warntype = QUOTA_NL_BSOFTLONGWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_bsoftlimit &&
- tspace > dquot->dq_dqb.dqb_bsoftlimit &&
- dquot->dq_dqb.dqb_btime == 0) {
- if (!prealloc) {
- *warntype = QUOTA_NL_BSOFTWARN;
- dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
- }
- else
- /*
- * We don't allow preallocation to exceed softlimit so exceeding will
- * be always printed
- */
- return NO_QUOTA;
- }
-
- return QUOTA_OK;
-}
-
-static int info_idq_free(struct dquot *dquot, qsize_t inodes)
-{
- if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
- dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
- !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
- return QUOTA_NL_NOWARN;
-
- if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
- return QUOTA_NL_ISOFTBELOW;
- if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
- dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit)
- return QUOTA_NL_IHARDBELOW;
- return QUOTA_NL_NOWARN;
-}
-
-static int info_bdq_free(struct dquot *dquot, qsize_t space)
-{
- if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
- dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
- return QUOTA_NL_NOWARN;
-
- if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
- return QUOTA_NL_BSOFTBELOW;
- if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
- dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
- return QUOTA_NL_BHARDBELOW;
- return QUOTA_NL_NOWARN;
-}
-/*
- * Initialize quota pointers in inode
- * We do things in a bit complicated way but by that we avoid calling
- * dqget() and thus filesystem callbacks under dqptr_sem.
- */
-int dquot_initialize(struct inode *inode, int type)
-{
- unsigned int id = 0;
- int cnt, ret = 0;
- struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT };
- struct super_block *sb = inode->i_sb;
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode))
- return 0;
-
- /* First get references to structures we might need. */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- switch (cnt) {
- case USRQUOTA:
- id = inode->i_uid;
- break;
- case GRPQUOTA:
- id = inode->i_gid;
- break;
- }
- got[cnt] = dqget(sb, id, cnt);
- }
-
- down_write(&sb_dqopt(sb)->dqptr_sem);
- /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
- if (IS_NOQUOTA(inode))
- goto out_err;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- /* Avoid races with quotaoff() */
- if (!sb_has_quota_active(sb, cnt))
- continue;
- if (inode->i_dquot[cnt] == NODQUOT) {
- inode->i_dquot[cnt] = got[cnt];
- got[cnt] = NODQUOT;
- }
- }
-out_err:
- up_write(&sb_dqopt(sb)->dqptr_sem);
- /* Drop unused references */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- dqput(got[cnt]);
- return ret;
-}
-EXPORT_SYMBOL(dquot_initialize);
-
-/*
- * Release all quotas referenced by inode
- */
-int dquot_drop(struct inode *inode)
-{
- int cnt;
- struct dquot *put[MAXQUOTAS];
-
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- put[cnt] = inode->i_dquot[cnt];
- inode->i_dquot[cnt] = NODQUOT;
- }
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- dqput(put[cnt]);
- return 0;
-}
-EXPORT_SYMBOL(dquot_drop);
-
-/* Wrapper to remove references to quota structures from inode */
-void vfs_dq_drop(struct inode *inode)
-{
- /* Here we can get arbitrary inode from clear_inode() so we have
- * to be careful. OTOH we don't need locking as quota operations
- * are allowed to change only at mount time */
- if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
- && inode->i_sb->dq_op->drop) {
- int cnt;
- /* Test before calling to rule out calls from proc and such
- * where we are not allowed to block. Note that this is
- * actually reliable test even without the lock - the caller
- * must assure that nobody can come after the DQUOT_DROP and
- * add quota pointers back anyway */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt] != NODQUOT)
- break;
- if (cnt < MAXQUOTAS)
- inode->i_sb->dq_op->drop(inode);
- }
-}
-EXPORT_SYMBOL(vfs_dq_drop);
-
-/*
- * Following four functions update i_blocks+i_bytes fields and
- * quota information (together with appropriate checks)
- * NOTE: We absolutely rely on the fact that caller dirties
- * the inode (usually macros in quotaops.h care about this) and
- * holds a handle for the current transaction so that dquot write and
- * inode write go into the same transaction.
- */
-
-/*
- * This operation can block, but only after everything is updated
- */
-int __dquot_alloc_space(struct inode *inode, qsize_t number,
- int warn, int reserve)
-{
- int cnt, ret = QUOTA_OK;
- char warntype[MAXQUOTAS];
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warntype[cnt] = QUOTA_NL_NOWARN;
-
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
- == NO_QUOTA) {
- ret = NO_QUOTA;
- goto out_unlock;
- }
- }
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (reserve)
- dquot_resv_space(inode->i_dquot[cnt], number);
- else
- dquot_incr_space(inode->i_dquot[cnt], number);
- }
- if (!reserve)
- inode_add_bytes(inode, number);
-out_unlock:
- spin_unlock(&dq_data_lock);
- flush_warnings(inode->i_dquot, warntype);
- return ret;
-}
-
-int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
-{
- int cnt, ret = QUOTA_OK;
-
- /*
- * First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex
- */
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out_unlock;
- }
-
- ret = __dquot_alloc_space(inode, number, warn, 0);
- if (ret == NO_QUOTA)
- goto out_unlock;
-
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_alloc_space);
-
-int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
-{
- int ret = QUOTA_OK;
-
- if (IS_NOQUOTA(inode))
- goto out;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode))
- goto out_unlock;
-
- ret = __dquot_alloc_space(inode, number, warn, 1);
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_reserve_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_alloc_inode(const struct inode *inode, qsize_t number)
-{
- int cnt, ret = NO_QUOTA;
- char warntype[MAXQUOTAS];
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode))
- return QUOTA_OK;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warntype[cnt] = QUOTA_NL_NOWARN;
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
- goto warn_put_all;
- }
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- dquot_incr_inodes(inode->i_dquot[cnt], number);
- }
- ret = QUOTA_OK;
-warn_put_all:
- spin_unlock(&dq_data_lock);
- if (ret == QUOTA_OK)
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return ret;
-}
-EXPORT_SYMBOL(dquot_alloc_inode);
-
-int dquot_claim_space(struct inode *inode, qsize_t number)
-{
- int cnt;
- int ret = QUOTA_OK;
-
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- inode_add_bytes(inode, number);
- goto out;
- }
-
- spin_lock(&dq_data_lock);
- /* Claim reserved quotas to allocated quotas */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] != NODQUOT)
- dquot_claim_reserved_space(inode->i_dquot[cnt],
- number);
- }
- /* Update inode bytes */
- inode_add_bytes(inode, number);
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_claim_space);
-
-/*
- * Release reserved quota space
- */
-void dquot_release_reserved_space(struct inode *inode, qsize_t number)
-{
- int cnt;
-
- if (IS_NOQUOTA(inode))
- goto out;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode))
- goto out_unlock;
-
- spin_lock(&dq_data_lock);
- /* Release reserved dquots */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] != NODQUOT)
- dquot_free_reserved_space(inode->i_dquot[cnt], number);
- }
- spin_unlock(&dq_data_lock);
-
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return;
-}
-EXPORT_SYMBOL(dquot_release_reserved_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_free_space(struct inode *inode, qsize_t number)
-{
- unsigned int cnt;
- char warntype[MAXQUOTAS];
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode)) {
-out_sub:
- inode_sub_bytes(inode, number);
- return QUOTA_OK;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- goto out_sub;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
- dquot_decr_space(inode->i_dquot[cnt], number);
- }
- inode_sub_bytes(inode, number);
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
-}
-EXPORT_SYMBOL(dquot_free_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_free_inode(const struct inode *inode, qsize_t number)
-{
- unsigned int cnt;
- char warntype[MAXQUOTAS];
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode))
- return QUOTA_OK;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
- dquot_decr_inodes(inode->i_dquot[cnt], number);
- }
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
-}
-EXPORT_SYMBOL(dquot_free_inode);
-
-/*
- * call back function, get reserved quota space from underlying fs
- */
-qsize_t dquot_get_reserved_space(struct inode *inode)
-{
- qsize_t reserved_space = 0;
-
- if (sb_any_quota_active(inode->i_sb) &&
- inode->i_sb->dq_op->get_reserved_space)
- reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
- return reserved_space;
-}
-
-/*
- * Transfer the number of inode and blocks from one diskquota to an other.
- *
- * This operation can block, but only after everything is updated
- * A transaction must be started when entering this function.
- */
-int dquot_transfer(struct inode *inode, struct iattr *iattr)
-{
- qsize_t space, cur_space;
- qsize_t rsv_space = 0;
- struct dquot *transfer_from[MAXQUOTAS];
- struct dquot *transfer_to[MAXQUOTAS];
- int cnt, ret = QUOTA_OK;
- int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
- chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
- char warntype_to[MAXQUOTAS];
- char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode))
- return QUOTA_OK;
- /* Initialize the arrays */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- transfer_from[cnt] = NODQUOT;
- transfer_to[cnt] = NODQUOT;
- warntype_to[cnt] = QUOTA_NL_NOWARN;
- switch (cnt) {
- case USRQUOTA:
- if (!chuid)
- continue;
- transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
- break;
- case GRPQUOTA:
- if (!chgid)
- continue;
- transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
- break;
- }
- }
-
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- goto put_all;
- }
- spin_lock(&dq_data_lock);
- cur_space = inode_get_bytes(inode);
- rsv_space = dquot_get_reserved_space(inode);
- space = cur_space + rsv_space;
- /* Build the transfer_from list and check the limits */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (transfer_to[cnt] == NODQUOT)
- continue;
- transfer_from[cnt] = inode->i_dquot[cnt];
- if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
- NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
- warntype_to + cnt) == NO_QUOTA)
- goto over_quota;
- }
-
- /*
- * Finally perform the needed transfer from transfer_from to transfer_to
- */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- /*
- * Skip changes for same uid or gid or for turned off quota-type.
- */
- if (transfer_to[cnt] == NODQUOT)
- continue;
-
- /* Due to IO error we might not have transfer_from[] structure */
- if (transfer_from[cnt]) {
- warntype_from_inodes[cnt] =
- info_idq_free(transfer_from[cnt], 1);
- warntype_from_space[cnt] =
- info_bdq_free(transfer_from[cnt], space);
- dquot_decr_inodes(transfer_from[cnt], 1);
- dquot_decr_space(transfer_from[cnt], cur_space);
- dquot_free_reserved_space(transfer_from[cnt],
- rsv_space);
- }
-
- dquot_incr_inodes(transfer_to[cnt], 1);
- dquot_incr_space(transfer_to[cnt], cur_space);
- dquot_resv_space(transfer_to[cnt], rsv_space);
-
- inode->i_dquot[cnt] = transfer_to[cnt];
- }
- spin_unlock(&dq_data_lock);
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
-
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (transfer_from[cnt])
- mark_dquot_dirty(transfer_from[cnt]);
- if (transfer_to[cnt]) {
- mark_dquot_dirty(transfer_to[cnt]);
- /* The reference we got is transferred to the inode */
- transfer_to[cnt] = NODQUOT;
- }
- }
-warn_put_all:
- flush_warnings(transfer_to, warntype_to);
- flush_warnings(transfer_from, warntype_from_inodes);
- flush_warnings(transfer_from, warntype_from_space);
-put_all:
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- dqput(transfer_from[cnt]);
- dqput(transfer_to[cnt]);
- }
- return ret;
-over_quota:
- spin_unlock(&dq_data_lock);
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Clear dquot pointers we don't want to dqput() */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- transfer_from[cnt] = NODQUOT;
- ret = NO_QUOTA;
- goto warn_put_all;
-}
-EXPORT_SYMBOL(dquot_transfer);
-
-/* Wrapper for transferring ownership of an inode */
-int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
-{
- if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
- vfs_dq_init(inode);
- if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
- return 1;
- }
- return 0;
-}
-EXPORT_SYMBOL(vfs_dq_transfer);
-
-/*
- * Write info of quota file to disk
- */
-int dquot_commit_info(struct super_block *sb, int type)
-{
- int ret;
- struct quota_info *dqopt = sb_dqopt(sb);
-
- mutex_lock(&dqopt->dqio_mutex);
- ret = dqopt->ops[type]->write_file_info(sb, type);
- mutex_unlock(&dqopt->dqio_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_commit_info);
-
-/*
- * Definitions of diskquota operations.
- */
-struct dquot_operations dquot_operations = {
- .initialize = dquot_initialize,
- .drop = dquot_drop,
- .alloc_space = dquot_alloc_space,
- .alloc_inode = dquot_alloc_inode,
- .free_space = dquot_free_space,
- .free_inode = dquot_free_inode,
- .transfer = dquot_transfer,
- .write_dquot = dquot_commit,
- .acquire_dquot = dquot_acquire,
- .release_dquot = dquot_release,
- .mark_dirty = dquot_mark_dquot_dirty,
- .write_info = dquot_commit_info,
- .alloc_dquot = dquot_alloc,
- .destroy_dquot = dquot_destroy,
-};
-
-/*
- * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
- */
-int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
-{
- int cnt, ret = 0;
- struct quota_info *dqopt = sb_dqopt(sb);
- struct inode *toputinode[MAXQUOTAS];
-
- /* Cannot turn off usage accounting without turning off limits, or
- * suspend quotas and simultaneously turn quotas off. */
- if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
- || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
- DQUOT_USAGE_ENABLED)))
- return -EINVAL;
-
- /* We need to serialize quota_off() for device */
- mutex_lock(&dqopt->dqonoff_mutex);
-
- /*
- * Skip everything if there's nothing to do. We have to do this because
- * sometimes we are called when fill_super() failed and calling
- * sync_fs() in such cases does no good.
- */
- if (!sb_any_quota_loaded(sb)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- return 0;
- }
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- toputinode[cnt] = NULL;
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_loaded(sb, cnt))
- continue;
-
- if (flags & DQUOT_SUSPENDED) {
- spin_lock(&dq_state_lock);
- dqopt->flags |=
- dquot_state_flag(DQUOT_SUSPENDED, cnt);
- spin_unlock(&dq_state_lock);
- } else {
- spin_lock(&dq_state_lock);
- dqopt->flags &= ~dquot_state_flag(flags, cnt);
- /* Turning off suspended quotas? */
- if (!sb_has_quota_loaded(sb, cnt) &&
- sb_has_quota_suspended(sb, cnt)) {
- dqopt->flags &= ~dquot_state_flag(
- DQUOT_SUSPENDED, cnt);
- spin_unlock(&dq_state_lock);
- iput(dqopt->files[cnt]);
- dqopt->files[cnt] = NULL;
- continue;
- }
- spin_unlock(&dq_state_lock);
- }
-
- /* We still have to keep quota loaded? */
- if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
- continue;
-
- /* Note: these are blocking operations */
- drop_dquot_ref(sb, cnt);
- invalidate_dquots(sb, cnt);
- /*
- * Now all dquots should be invalidated, all writes done so we should be only
- * users of the info. No locks needed.
- */
- if (info_dirty(&dqopt->info[cnt]))
- sb->dq_op->write_info(sb, cnt);
- if (dqopt->ops[cnt]->free_file_info)
- dqopt->ops[cnt]->free_file_info(sb, cnt);
- put_quota_format(dqopt->info[cnt].dqi_format);
-
- toputinode[cnt] = dqopt->files[cnt];
- if (!sb_has_quota_loaded(sb, cnt))
- dqopt->files[cnt] = NULL;
- dqopt->info[cnt].dqi_flags = 0;
- dqopt->info[cnt].dqi_igrace = 0;
- dqopt->info[cnt].dqi_bgrace = 0;
- dqopt->ops[cnt] = NULL;
- }
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- /* Skip syncing and setting flags if quota files are hidden */
- if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
- goto put_inodes;
-
- /* Sync the superblock so that buffers with quota data are written to
- * disk (and so userspace sees correct data afterwards). */
- if (sb->s_op->sync_fs)
- sb->s_op->sync_fs(sb, 1);
- sync_blockdev(sb->s_bdev);
- /* Now the quota files are just ordinary files and we can set the
- * inode flags back. Moreover we discard the pagecache so that
- * userspace sees the writes we did bypassing the pagecache. We
- * must also discard the blockdev buffers so that we see the
- * changes done by userspace on the next quotaon() */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (toputinode[cnt]) {
- mutex_lock(&dqopt->dqonoff_mutex);
- /* If quota was reenabled in the meantime, we have
- * nothing to do */
- if (!sb_has_quota_loaded(sb, cnt)) {
- mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
- toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
- S_NOATIME | S_NOQUOTA);
- truncate_inode_pages(&toputinode[cnt]->i_data, 0);
- mutex_unlock(&toputinode[cnt]->i_mutex);
- mark_inode_dirty(toputinode[cnt]);
- }
- mutex_unlock(&dqopt->dqonoff_mutex);
- }
- if (sb->s_bdev)
- invalidate_bdev(sb->s_bdev);
-put_inodes:
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (toputinode[cnt]) {
- /* On remount RO, we keep the inode pointer so that we
- * can reenable quota on the subsequent remount RW. We
- * have to check 'flags' variable and not use sb_has_
- * function because another quotaon / quotaoff could
- * change global state before we got here. We refuse
- * to suspend quotas when there is pending delete on
- * the quota file... */
- if (!(flags & DQUOT_SUSPENDED))
- iput(toputinode[cnt]);
- else if (!toputinode[cnt]->i_nlink)
- ret = -EBUSY;
- }
- return ret;
-}
-EXPORT_SYMBOL(vfs_quota_disable);
-
-int vfs_quota_off(struct super_block *sb, int type, int remount)
-{
- return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
- (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
-}
-EXPORT_SYMBOL(vfs_quota_off);
-/*
- * Turn quotas on on a device
- */
-
-/*
- * Helper function to turn quotas on when we already have the inode of
- * quota file and no quota information is loaded.
- */
-static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
- unsigned int flags)
-{
- struct quota_format_type *fmt = find_quota_format(format_id);
- struct super_block *sb = inode->i_sb;
- struct quota_info *dqopt = sb_dqopt(sb);
- int error;
- int oldflags = -1;
-
- if (!fmt)
- return -ESRCH;
- if (!S_ISREG(inode->i_mode)) {
- error = -EACCES;
- goto out_fmt;
- }
- if (IS_RDONLY(inode)) {
- error = -EROFS;
- goto out_fmt;
- }
- if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
- error = -EINVAL;
- goto out_fmt;
- }
- /* Usage always has to be set... */
- if (!(flags & DQUOT_USAGE_ENABLED)) {
- error = -EINVAL;
- goto out_fmt;
- }
-
- if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
- /* As we bypass the pagecache we must now flush the inode so
- * that we see all the changes from userspace... */
- write_inode_now(inode, 1);
- /* And now flush the block cache so that kernel sees the
- * changes */
- invalidate_bdev(sb->s_bdev);
- }
- mutex_lock(&inode->i_mutex);
- mutex_lock(&dqopt->dqonoff_mutex);
- if (sb_has_quota_loaded(sb, type)) {
- error = -EBUSY;
- goto out_lock;
- }
-
- if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
- /* We don't want quota and atime on quota files (deadlocks
- * possible) Also nobody should write to the file - we use
- * special IO operations which ignore the immutable bit. */
- down_write(&dqopt->dqptr_sem);
- oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
- inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
- up_write(&dqopt->dqptr_sem);
- sb->dq_op->drop(inode);
- }
-
- error = -EIO;
- dqopt->files[type] = igrab(inode);
- if (!dqopt->files[type])
- goto out_lock;
- error = -EINVAL;
- if (!fmt->qf_ops->check_quota_file(sb, type))
- goto out_file_init;
-
- dqopt->ops[type] = fmt->qf_ops;
- dqopt->info[type].dqi_format = fmt;
- dqopt->info[type].dqi_fmt_id = format_id;
- INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
- mutex_lock(&dqopt->dqio_mutex);
- if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
- mutex_unlock(&dqopt->dqio_mutex);
- goto out_file_init;
- }
- mutex_unlock(&dqopt->dqio_mutex);
- mutex_unlock(&inode->i_mutex);
- spin_lock(&dq_state_lock);
- dqopt->flags |= dquot_state_flag(flags, type);
- spin_unlock(&dq_state_lock);
-
- add_dquot_ref(sb, type);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- return 0;
-
-out_file_init:
- dqopt->files[type] = NULL;
- iput(inode);
-out_lock:
- mutex_unlock(&dqopt->dqonoff_mutex);
- if (oldflags != -1) {
- down_write(&dqopt->dqptr_sem);
- /* Set the flags back (in the case of accidental quotaon()
- * on a wrong file we don't want to mess up the flags) */
- inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
- inode->i_flags |= oldflags;
- up_write(&dqopt->dqptr_sem);
- }
- mutex_unlock(&inode->i_mutex);
-out_fmt:
- put_quota_format(fmt);
-
- return error;
-}
-
-/* Reenable quotas on remount RW */
-static int vfs_quota_on_remount(struct super_block *sb, int type)
-{
- struct quota_info *dqopt = sb_dqopt(sb);
- struct inode *inode;
- int ret;
- unsigned int flags;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- if (!sb_has_quota_suspended(sb, type)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- return 0;
- }
- inode = dqopt->files[type];
- dqopt->files[type] = NULL;
- spin_lock(&dq_state_lock);
- flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
- DQUOT_LIMITS_ENABLED, type);
- dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
- spin_unlock(&dq_state_lock);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- flags = dquot_generic_flag(flags, type);
- ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
- flags);
- iput(inode);
-
- return ret;
-}
-
-int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
- struct path *path)
-{
- int error = security_quota_on(path->dentry);
- if (error)
- return error;
- /* Quota file not on the same filesystem? */
- if (path->mnt->mnt_sb != sb)
- error = -EXDEV;
- else
- error = vfs_load_quota_inode(path->dentry->d_inode, type,
- format_id, DQUOT_USAGE_ENABLED |
- DQUOT_LIMITS_ENABLED);
- return error;
-}
-EXPORT_SYMBOL(vfs_quota_on_path);
-
-int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
- int remount)
-{
- struct path path;
- int error;
-
- if (remount)
- return vfs_quota_on_remount(sb, type);
-
- error = kern_path(name, LOOKUP_FOLLOW, &path);
- if (!error) {
- error = vfs_quota_on_path(sb, type, format_id, &path);
- path_put(&path);
- }
- return error;
-}
-EXPORT_SYMBOL(vfs_quota_on);
-
-/*
- * More powerful function for turning on quotas allowing setting
- * of individual quota flags
- */
-int vfs_quota_enable(struct inode *inode, int type, int format_id,
- unsigned int flags)
-{
- int ret = 0;
- struct super_block *sb = inode->i_sb;
- struct quota_info *dqopt = sb_dqopt(sb);
-
- /* Just unsuspend quotas? */
- if (flags & DQUOT_SUSPENDED)
- return vfs_quota_on_remount(sb, type);
- if (!flags)
- return 0;
- /* Just updating flags needed? */
- if (sb_has_quota_loaded(sb, type)) {
- mutex_lock(&dqopt->dqonoff_mutex);
- /* Now do a reliable test... */
- if (!sb_has_quota_loaded(sb, type)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- goto load_quota;
- }
- if (flags & DQUOT_USAGE_ENABLED &&
- sb_has_quota_usage_enabled(sb, type)) {
- ret = -EBUSY;
- goto out_lock;
- }
- if (flags & DQUOT_LIMITS_ENABLED &&
- sb_has_quota_limits_enabled(sb, type)) {
- ret = -EBUSY;
- goto out_lock;
- }
- spin_lock(&dq_state_lock);
- sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
- spin_unlock(&dq_state_lock);
-out_lock:
- mutex_unlock(&dqopt->dqonoff_mutex);
- return ret;
- }
-
-load_quota:
- return vfs_load_quota_inode(inode, type, format_id, flags);
-}
-EXPORT_SYMBOL(vfs_quota_enable);
-
-/*
- * This function is used when filesystem needs to initialize quotas
- * during mount time.
- */
-int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
- int format_id, int type)
-{
- struct dentry *dentry;
- int error;
-
- dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
-
- if (!dentry->d_inode) {
- error = -ENOENT;
- goto out;
- }
-
- error = security_quota_on(dentry);
- if (!error)
- error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
- DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
-
-out:
- dput(dentry);
- return error;
-}
-EXPORT_SYMBOL(vfs_quota_on_mount);
-
-/* Wrapper to turn on quotas when remounting rw */
-int vfs_dq_quota_on_remount(struct super_block *sb)
-{
- int cnt;
- int ret = 0, err;
-
- if (!sb->s_qcop || !sb->s_qcop->quota_on)
- return -ENOSYS;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
- if (err < 0 && !ret)
- ret = err;
- }
- return ret;
-}
-EXPORT_SYMBOL(vfs_dq_quota_on_remount);
-
-static inline qsize_t qbtos(qsize_t blocks)
-{
- return blocks << QIF_DQBLKSIZE_BITS;
-}
-
-static inline qsize_t stoqb(qsize_t space)
-{
- return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
-}
-
-/* Generic routine for getting common part of quota structure */
-static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
-{
- struct mem_dqblk *dm = &dquot->dq_dqb;
-
- spin_lock(&dq_data_lock);
- di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
- di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
- di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
- di->dqb_ihardlimit = dm->dqb_ihardlimit;
- di->dqb_isoftlimit = dm->dqb_isoftlimit;
- di->dqb_curinodes = dm->dqb_curinodes;
- di->dqb_btime = dm->dqb_btime;
- di->dqb_itime = dm->dqb_itime;
- di->dqb_valid = QIF_ALL;
- spin_unlock(&dq_data_lock);
-}
-
-int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
-{
- struct dquot *dquot;
-
- dquot = dqget(sb, id, type);
- if (dquot == NODQUOT)
- return -ESRCH;
- do_get_dqblk(dquot, di);
- dqput(dquot);
-
- return 0;
-}
-EXPORT_SYMBOL(vfs_get_dqblk);
-
-/* Generic routine for setting common part of quota structure */
-static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
-{
- struct mem_dqblk *dm = &dquot->dq_dqb;
- int check_blim = 0, check_ilim = 0;
- struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
-
- if ((di->dqb_valid & QIF_BLIMITS &&
- (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
- di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
- (di->dqb_valid & QIF_ILIMITS &&
- (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
- di->dqb_isoftlimit > dqi->dqi_maxilimit)))
- return -ERANGE;
-
- spin_lock(&dq_data_lock);
- if (di->dqb_valid & QIF_SPACE) {
- dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_BLIMITS) {
- dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
- dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_INODES) {
- dm->dqb_curinodes = di->dqb_curinodes;
- check_ilim = 1;
- __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_ILIMITS) {
- dm->dqb_isoftlimit = di->dqb_isoftlimit;
- dm->dqb_ihardlimit = di->dqb_ihardlimit;
- check_ilim = 1;
- __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_BTIME) {
- dm->dqb_btime = di->dqb_btime;
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_ITIME) {
- dm->dqb_itime = di->dqb_itime;
- check_ilim = 1;
- __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
- }
-
- if (check_blim) {
- if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) {
- dm->dqb_btime = 0;
- clear_bit(DQ_BLKS_B, &dquot->dq_flags);
- }
- else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
- dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
- }
- if (check_ilim) {
- if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
- dm->dqb_itime = 0;
- clear_bit(DQ_INODES_B, &dquot->dq_flags);
- }
- else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
- dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
- }
- if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
- clear_bit(DQ_FAKE_B, &dquot->dq_flags);
- else
- set_bit(DQ_FAKE_B, &dquot->dq_flags);
- spin_unlock(&dq_data_lock);
- mark_dquot_dirty(dquot);
-
- return 0;
-}
-
-int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
-{
- struct dquot *dquot;
- int rc;
-
- dquot = dqget(sb, id, type);
- if (!dquot) {
- rc = -ESRCH;
- goto out;
- }
- rc = do_set_dqblk(dquot, di);
- dqput(dquot);
-out:
- return rc;
-}
-EXPORT_SYMBOL(vfs_set_dqblk);
-
-/* Generic routine for getting common part of quota file information */
-int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
-{
- struct mem_dqinfo *mi;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- if (!sb_has_quota_active(sb, type)) {
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return -ESRCH;
- }
- mi = sb_dqopt(sb)->info + type;
- spin_lock(&dq_data_lock);
- ii->dqi_bgrace = mi->dqi_bgrace;
- ii->dqi_igrace = mi->dqi_igrace;
- ii->dqi_flags = mi->dqi_flags & DQF_MASK;
- ii->dqi_valid = IIF_ALL;
- spin_unlock(&dq_data_lock);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return 0;
-}
-EXPORT_SYMBOL(vfs_get_dqinfo);
-
-/* Generic routine for setting common part of quota file information */
-int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
-{
- struct mem_dqinfo *mi;
- int err = 0;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- if (!sb_has_quota_active(sb, type)) {
- err = -ESRCH;
- goto out;
- }
- mi = sb_dqopt(sb)->info + type;
- spin_lock(&dq_data_lock);
- if (ii->dqi_valid & IIF_BGRACE)
- mi->dqi_bgrace = ii->dqi_bgrace;
- if (ii->dqi_valid & IIF_IGRACE)
- mi->dqi_igrace = ii->dqi_igrace;
- if (ii->dqi_valid & IIF_FLAGS)
- mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
- spin_unlock(&dq_data_lock);
- mark_info_dirty(sb, type);
- /* Force write to disk */
- sb->dq_op->write_info(sb, type);
-out:
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return err;
-}
-EXPORT_SYMBOL(vfs_set_dqinfo);
-
-struct quotactl_ops vfs_quotactl_ops = {
- .quota_on = vfs_quota_on,
- .quota_off = vfs_quota_off,
- .quota_sync = vfs_quota_sync,
- .get_info = vfs_get_dqinfo,
- .set_info = vfs_set_dqinfo,
- .get_dqblk = vfs_get_dqblk,
- .set_dqblk = vfs_set_dqblk
-};
-
-static ctl_table fs_dqstats_table[] = {
- {
- .ctl_name = FS_DQ_LOOKUPS,
- .procname = "lookups",
- .data = &dqstats.lookups,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_DROPS,
- .procname = "drops",
- .data = &dqstats.drops,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_READS,
- .procname = "reads",
- .data = &dqstats.reads,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_WRITES,
- .procname = "writes",
- .data = &dqstats.writes,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_CACHE_HITS,
- .procname = "cache_hits",
- .data = &dqstats.cache_hits,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_ALLOCATED,
- .procname = "allocated_dquots",
- .data = &dqstats.allocated_dquots,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_FREE,
- .procname = "free_dquots",
- .data = &dqstats.free_dquots,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_SYNCS,
- .procname = "syncs",
- .data = &dqstats.syncs,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
-#ifdef CONFIG_PRINT_QUOTA_WARNING
- {
- .ctl_name = FS_DQ_WARNINGS,
- .procname = "warnings",
- .data = &flag_print_warnings,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
-#endif
- { .ctl_name = 0 },
-};
-
-static ctl_table fs_table[] = {
- {
- .ctl_name = FS_DQSTATS,
- .procname = "quota",
- .mode = 0555,
- .child = fs_dqstats_table,
- },
- { .ctl_name = 0 },
-};
-
-static ctl_table sys_table[] = {
- {
- .ctl_name = CTL_FS,
- .procname = "fs",
- .mode = 0555,
- .child = fs_table,
- },
- { .ctl_name = 0 },
-};
-
-static int __init dquot_init(void)
-{
- int i;
- unsigned long nr_hash, order;
-
- printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
-
- register_sysctl_table(sys_table);
-
- dquot_cachep = kmem_cache_create("dquot",
- sizeof(struct dquot), sizeof(unsigned long) * 4,
- (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD|SLAB_PANIC),
- NULL);
-
- order = 0;
- dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
- if (!dquot_hash)
- panic("Cannot create dquot hash table");
-
- /* Find power-of-two hlist_heads which can fit into allocation */
- nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
- dq_hash_bits = 0;
- do {
- dq_hash_bits++;
- } while (nr_hash >> dq_hash_bits);
- dq_hash_bits--;
-
- nr_hash = 1UL << dq_hash_bits;
- dq_hash_mask = nr_hash - 1;
- for (i = 0; i < nr_hash; i++)
- INIT_HLIST_HEAD(dquot_hash + i);
-
- printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
- nr_hash, order, (PAGE_SIZE << order));
-
- register_shrinker(&dqcache_shrinker);
-
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
- if (genl_register_family("a_genl_family) != 0)
- printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
-#endif
-
- return 0;
-}
-module_init(dquot_init);
+++ /dev/null
-/*
- * Quota code necessary even when VFS quota support is not compiled
- * into the kernel. The interesting stuff is over in dquot.c, here
- * we have symbols for initial quotactl(2) handling, the sysctl(2)
- * variables, etc - things needed even when quota support disabled.
- */
-
-#include <linux/fs.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-#include <asm/current.h>
-#include <asm/uaccess.h>
-#include <linux/compat.h>
-#include <linux/kernel.h>
-#include <linux/security.h>
-#include <linux/syscalls.h>
-#include <linux/buffer_head.h>
-#include <linux/capability.h>
-#include <linux/quotaops.h>
-#include <linux/types.h>
-
-/* Check validity of generic quotactl commands */
-static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
-{
- if (type >= MAXQUOTAS)
- return -EINVAL;
- if (!sb && cmd != Q_SYNC)
- return -ENODEV;
- /* Is operation supported? */
- if (sb && !sb->s_qcop)
- return -ENOSYS;
-
- switch (cmd) {
- case Q_GETFMT:
- break;
- case Q_QUOTAON:
- if (!sb->s_qcop->quota_on)
- return -ENOSYS;
- break;
- case Q_QUOTAOFF:
- if (!sb->s_qcop->quota_off)
- return -ENOSYS;
- break;
- case Q_SETINFO:
- if (!sb->s_qcop->set_info)
- return -ENOSYS;
- break;
- case Q_GETINFO:
- if (!sb->s_qcop->get_info)
- return -ENOSYS;
- break;
- case Q_SETQUOTA:
- if (!sb->s_qcop->set_dqblk)
- return -ENOSYS;
- break;
- case Q_GETQUOTA:
- if (!sb->s_qcop->get_dqblk)
- return -ENOSYS;
- break;
- case Q_SYNC:
- if (sb && !sb->s_qcop->quota_sync)
- return -ENOSYS;
- break;
- default:
- return -EINVAL;
- }
-
- /* Is quota turned on for commands which need it? */
- switch (cmd) {
- case Q_GETFMT:
- case Q_GETINFO:
- case Q_SETINFO:
- case Q_SETQUOTA:
- case Q_GETQUOTA:
- /* This is just informative test so we are satisfied without a lock */
- if (!sb_has_quota_active(sb, type))
- return -ESRCH;
- }
-
- /* Check privileges */
- if (cmd == Q_GETQUOTA) {
- if (((type == USRQUOTA && current_euid() != id) ||
- (type == GRPQUOTA && !in_egroup_p(id))) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- }
- else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO)
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- return 0;
-}
-
-/* Check validity of XFS Quota Manager commands */
-static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
-{
- if (type >= XQM_MAXQUOTAS)
- return -EINVAL;
- if (!sb)
- return -ENODEV;
- if (!sb->s_qcop)
- return -ENOSYS;
-
- switch (cmd) {
- case Q_XQUOTAON:
- case Q_XQUOTAOFF:
- case Q_XQUOTARM:
- if (!sb->s_qcop->set_xstate)
- return -ENOSYS;
- break;
- case Q_XGETQSTAT:
- if (!sb->s_qcop->get_xstate)
- return -ENOSYS;
- break;
- case Q_XSETQLIM:
- if (!sb->s_qcop->set_xquota)
- return -ENOSYS;
- break;
- case Q_XGETQUOTA:
- if (!sb->s_qcop->get_xquota)
- return -ENOSYS;
- break;
- case Q_XQUOTASYNC:
- if (!sb->s_qcop->quota_sync)
- return -ENOSYS;
- break;
- default:
- return -EINVAL;
- }
-
- /* Check privileges */
- if (cmd == Q_XGETQUOTA) {
- if (((type == XQM_USRQUOTA && current_euid() != id) ||
- (type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- }
-
- return 0;
-}
-
-static int check_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
-{
- int error;
-
- if (XQM_COMMAND(cmd))
- error = xqm_quotactl_valid(sb, type, cmd, id);
- else
- error = generic_quotactl_valid(sb, type, cmd, id);
- if (!error)
- error = security_quotactl(cmd, type, id, sb);
- return error;
-}
-
-static void quota_sync_sb(struct super_block *sb, int type)
-{
- int cnt;
-
- sb->s_qcop->quota_sync(sb, type);
-
- if (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)
- return;
- /* This is not very clever (and fast) but currently I don't know about
- * any other simple way of getting quota data to disk and we must get
- * them there for userspace to be visible... */
- if (sb->s_op->sync_fs)
- sb->s_op->sync_fs(sb, 1);
- sync_blockdev(sb->s_bdev);
-
- /*
- * Now when everything is written we can discard the pagecache so
- * that userspace sees the changes.
- */
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, I_MUTEX_QUOTA);
- truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
- mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
- }
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
-}
-
-void sync_dquots(struct super_block *sb, int type)
-{
- int cnt;
-
- if (sb) {
- if (sb->s_qcop->quota_sync)
- quota_sync_sb(sb, type);
- return;
- }
-
- spin_lock(&sb_lock);
-restart:
- list_for_each_entry(sb, &super_blocks, s_list) {
- /* This test just improves performance so it needn't be reliable... */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && type != cnt)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- if (!info_dirty(&sb_dqopt(sb)->info[cnt]) &&
- list_empty(&sb_dqopt(sb)->info[cnt].dqi_dirty_list))
- continue;
- break;
- }
- if (cnt == MAXQUOTAS)
- continue;
- sb->s_count++;
- spin_unlock(&sb_lock);
- down_read(&sb->s_umount);
- if (sb->s_root && sb->s_qcop->quota_sync)
- quota_sync_sb(sb, type);
- up_read(&sb->s_umount);
- spin_lock(&sb_lock);
- if (__put_super_and_need_restart(sb))
- goto restart;
- }
- spin_unlock(&sb_lock);
-}
-
-/* Copy parameters and call proper function */
-static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void __user *addr)
-{
- int ret;
-
- switch (cmd) {
- case Q_QUOTAON: {
- char *pathname;
-
- if (IS_ERR(pathname = getname(addr)))
- return PTR_ERR(pathname);
- ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
- putname(pathname);
- return ret;
- }
- case Q_QUOTAOFF:
- return sb->s_qcop->quota_off(sb, type, 0);
-
- case Q_GETFMT: {
- __u32 fmt;
-
- down_read(&sb_dqopt(sb)->dqptr_sem);
- if (!sb_has_quota_active(sb, type)) {
- up_read(&sb_dqopt(sb)->dqptr_sem);
- return -ESRCH;
- }
- fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
- up_read(&sb_dqopt(sb)->dqptr_sem);
- if (copy_to_user(addr, &fmt, sizeof(fmt)))
- return -EFAULT;
- return 0;
- }
- case Q_GETINFO: {
- struct if_dqinfo info;
-
- if ((ret = sb->s_qcop->get_info(sb, type, &info)))
- return ret;
- if (copy_to_user(addr, &info, sizeof(info)))
- return -EFAULT;
- return 0;
- }
- case Q_SETINFO: {
- struct if_dqinfo info;
-
- if (copy_from_user(&info, addr, sizeof(info)))
- return -EFAULT;
- return sb->s_qcop->set_info(sb, type, &info);
- }
- case Q_GETQUOTA: {
- struct if_dqblk idq;
-
- if ((ret = sb->s_qcop->get_dqblk(sb, type, id, &idq)))
- return ret;
- if (copy_to_user(addr, &idq, sizeof(idq)))
- return -EFAULT;
- return 0;
- }
- case Q_SETQUOTA: {
- struct if_dqblk idq;
-
- if (copy_from_user(&idq, addr, sizeof(idq)))
- return -EFAULT;
- return sb->s_qcop->set_dqblk(sb, type, id, &idq);
- }
- case Q_SYNC:
- sync_dquots(sb, type);
- return 0;
-
- case Q_XQUOTAON:
- case Q_XQUOTAOFF:
- case Q_XQUOTARM: {
- __u32 flags;
-
- if (copy_from_user(&flags, addr, sizeof(flags)))
- return -EFAULT;
- return sb->s_qcop->set_xstate(sb, flags, cmd);
- }
- case Q_XGETQSTAT: {
- struct fs_quota_stat fqs;
-
- if ((ret = sb->s_qcop->get_xstate(sb, &fqs)))
- return ret;
- if (copy_to_user(addr, &fqs, sizeof(fqs)))
- return -EFAULT;
- return 0;
- }
- case Q_XSETQLIM: {
- struct fs_disk_quota fdq;
-
- if (copy_from_user(&fdq, addr, sizeof(fdq)))
- return -EFAULT;
- return sb->s_qcop->set_xquota(sb, type, id, &fdq);
- }
- case Q_XGETQUOTA: {
- struct fs_disk_quota fdq;
-
- if ((ret = sb->s_qcop->get_xquota(sb, type, id, &fdq)))
- return ret;
- if (copy_to_user(addr, &fdq, sizeof(fdq)))
- return -EFAULT;
- return 0;
- }
- case Q_XQUOTASYNC:
- return sb->s_qcop->quota_sync(sb, type);
- /* We never reach here unless validity check is broken */
- default:
- BUG();
- }
- return 0;
-}
-
-/*
- * look up a superblock on which quota ops will be performed
- * - use the name of a block device to find the superblock thereon
- */
-static inline struct super_block *quotactl_block(const char __user *special)
-{
-#ifdef CONFIG_BLOCK
- struct block_device *bdev;
- struct super_block *sb;
- char *tmp = getname(special);
-
- if (IS_ERR(tmp))
- return ERR_CAST(tmp);
- bdev = lookup_bdev(tmp);
- putname(tmp);
- if (IS_ERR(bdev))
- return ERR_CAST(bdev);
- sb = get_super(bdev);
- bdput(bdev);
- if (!sb)
- return ERR_PTR(-ENODEV);
-
- return sb;
-#else
- return ERR_PTR(-ENODEV);
-#endif
-}
-
-/*
- * This is the system call interface. This communicates with
- * the user-level programs. Currently this only supports diskquota
- * calls. Maybe we need to add the process quotas etc. in the future,
- * but we probably should use rlimits for that.
- */
-SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
- qid_t, id, void __user *, addr)
-{
- uint cmds, type;
- struct super_block *sb = NULL;
- int ret;
-
- cmds = cmd >> SUBCMDSHIFT;
- type = cmd & SUBCMDMASK;
-
- if (cmds != Q_SYNC || special) {
- sb = quotactl_block(special);
- if (IS_ERR(sb))
- return PTR_ERR(sb);
- }
-
- ret = check_quotactl_valid(sb, type, cmds, id);
- if (ret >= 0)
- ret = do_quotactl(sb, type, cmds, id, addr);
- if (sb)
- drop_super(sb);
-
- return ret;
-}
-
-#if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT)
-/*
- * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
- * and is necessary due to alignment problems.
- */
-struct compat_if_dqblk {
- compat_u64 dqb_bhardlimit;
- compat_u64 dqb_bsoftlimit;
- compat_u64 dqb_curspace;
- compat_u64 dqb_ihardlimit;
- compat_u64 dqb_isoftlimit;
- compat_u64 dqb_curinodes;
- compat_u64 dqb_btime;
- compat_u64 dqb_itime;
- compat_uint_t dqb_valid;
-};
-
-/* XFS structures */
-struct compat_fs_qfilestat {
- compat_u64 dqb_bhardlimit;
- compat_u64 qfs_nblks;
- compat_uint_t qfs_nextents;
-};
-
-struct compat_fs_quota_stat {
- __s8 qs_version;
- __u16 qs_flags;
- __s8 qs_pad;
- struct compat_fs_qfilestat qs_uquota;
- struct compat_fs_qfilestat qs_gquota;
- compat_uint_t qs_incoredqs;
- compat_int_t qs_btimelimit;
- compat_int_t qs_itimelimit;
- compat_int_t qs_rtbtimelimit;
- __u16 qs_bwarnlimit;
- __u16 qs_iwarnlimit;
-};
-
-asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
- qid_t id, void __user *addr)
-{
- unsigned int cmds;
- struct if_dqblk __user *dqblk;
- struct compat_if_dqblk __user *compat_dqblk;
- struct fs_quota_stat __user *fsqstat;
- struct compat_fs_quota_stat __user *compat_fsqstat;
- compat_uint_t data;
- u16 xdata;
- long ret;
-
- cmds = cmd >> SUBCMDSHIFT;
-
- switch (cmds) {
- case Q_GETQUOTA:
- dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
- compat_dqblk = addr;
- ret = sys_quotactl(cmd, special, id, dqblk);
- if (ret)
- break;
- if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
- get_user(data, &dqblk->dqb_valid) ||
- put_user(data, &compat_dqblk->dqb_valid))
- ret = -EFAULT;
- break;
- case Q_SETQUOTA:
- dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
- compat_dqblk = addr;
- ret = -EFAULT;
- if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
- get_user(data, &compat_dqblk->dqb_valid) ||
- put_user(data, &dqblk->dqb_valid))
- break;
- ret = sys_quotactl(cmd, special, id, dqblk);
- break;
- case Q_XGETQSTAT:
- fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
- compat_fsqstat = addr;
- ret = sys_quotactl(cmd, special, id, fsqstat);
- if (ret)
- break;
- ret = -EFAULT;
- /* Copying qs_version, qs_flags, qs_pad */
- if (copy_in_user(compat_fsqstat, fsqstat,
- offsetof(struct compat_fs_quota_stat, qs_uquota)))
- break;
- /* Copying qs_uquota */
- if (copy_in_user(&compat_fsqstat->qs_uquota,
- &fsqstat->qs_uquota,
- sizeof(compat_fsqstat->qs_uquota)) ||
- get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
- put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
- break;
- /* Copying qs_gquota */
- if (copy_in_user(&compat_fsqstat->qs_gquota,
- &fsqstat->qs_gquota,
- sizeof(compat_fsqstat->qs_gquota)) ||
- get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
- put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
- break;
- /* Copying the rest */
- if (copy_in_user(&compat_fsqstat->qs_incoredqs,
- &fsqstat->qs_incoredqs,
- sizeof(struct compat_fs_quota_stat) -
- offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
- get_user(xdata, &fsqstat->qs_iwarnlimit) ||
- put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
- break;
- ret = 0;
- break;
- default:
- ret = sys_quotactl(cmd, special, id, addr);
- }
- return ret;
-}
-#endif
--- /dev/null
+#
+# Quota configuration
+#
+
+config QUOTA
+ bool "Quota support"
+ help
+ If you say Y here, you will be able to set per user limits for disk
+ usage (also called disk quotas). Currently, it works for the
+ ext2, ext3, and reiserfs file system. ext3 also supports journalled
+ quotas for which you don't need to run quotacheck(8) after an unclean
+ shutdown.
+ For further details, read the Quota mini-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>, or the documentation provided
+ with the quota tools. Probably the quota support is only useful for
+ multi user systems. If unsure, say N.
+
+config QUOTA_NETLINK_INTERFACE
+ bool "Report quota messages through netlink interface"
+ depends on QUOTA && NET
+ help
+ If you say Y here, quota warnings (about exceeding softlimit, reaching
+ hardlimit, etc.) will be reported through netlink interface. If unsure,
+ say Y.
+
+config PRINT_QUOTA_WARNING
+ bool "Print quota warnings to console (OBSOLETE)"
+ depends on QUOTA
+ default y
+ help
+ If you say Y here, quota warnings (about exceeding softlimit, reaching
+ hardlimit, etc.) will be printed to the process' controlling terminal.
+ Note that this behavior is currently deprecated and may go away in
+ future. Please use notification via netlink socket instead.
+
+# Generic support for tree structured quota files. Seleted when needed.
+config QUOTA_TREE
+ tristate
+
+config QFMT_V1
+ tristate "Old quota format support"
+ depends on QUOTA
+ help
+ This quota format was (is) used by kernels earlier than 2.4.22. If
+ you have quota working and you don't want to convert to new quota
+ format say Y here.
+
+config QFMT_V2
+ tristate "Quota format v2 support"
+ depends on QUOTA
+ select QUOTA_TREE
+ help
+ This quota format allows using quotas with 32-bit UIDs/GIDs. If you
+ need this functionality say Y here.
+
+config QUOTACTL
+ bool
+ depends on XFS_QUOTA || QUOTA
+ default y
--- /dev/null
+#
+# Makefile for the Linux filesystems.
+#
+# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-y :=
+
+obj-$(CONFIG_QUOTA) += dquot.o
+obj-$(CONFIG_QFMT_V1) += quota_v1.o
+obj-$(CONFIG_QFMT_V2) += quota_v2.o
+obj-$(CONFIG_QUOTA_TREE) += quota_tree.o
+obj-$(CONFIG_QUOTACTL) += quota.o
--- /dev/null
+/*
+ * Implementation of the diskquota system for the LINUX operating system. QUOTA
+ * is implemented using the BSD system call interface as the means of
+ * communication with the user level. This file contains the generic routines
+ * called by the different filesystems on allocation of an inode or block.
+ * These routines take care of the administration needed to have a consistent
+ * diskquota tracking system. The ideas of both user and group quotas are based
+ * on the Melbourne quota system as used on BSD derived systems. The internal
+ * implementation is based on one of the several variants of the LINUX
+ * inode-subsystem with added complexity of the diskquota system.
+ *
+ * Author: Marco van Wieringen <mvw@planets.elm.net>
+ *
+ * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
+ *
+ * Revised list management to avoid races
+ * -- Bill Hawes, <whawes@star.net>, 9/98
+ *
+ * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
+ * As the consequence the locking was moved from dquot_decr_...(),
+ * dquot_incr_...() to calling functions.
+ * invalidate_dquots() now writes modified dquots.
+ * Serialized quota_off() and quota_on() for mount point.
+ * Fixed a few bugs in grow_dquots().
+ * Fixed deadlock in write_dquot() - we no longer account quotas on
+ * quota files
+ * remove_dquot_ref() moved to inode.c - it now traverses through inodes
+ * add_dquot_ref() restarts after blocking
+ * Added check for bogus uid and fixed check for group in quotactl.
+ * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
+ *
+ * Used struct list_head instead of own list struct
+ * Invalidation of referenced dquots is no longer possible
+ * Improved free_dquots list management
+ * Quota and i_blocks are now updated in one place to avoid races
+ * Warnings are now delayed so we won't block in critical section
+ * Write updated not to require dquot lock
+ * Jan Kara, <jack@suse.cz>, 9/2000
+ *
+ * Added dynamic quota structure allocation
+ * Jan Kara <jack@suse.cz> 12/2000
+ *
+ * Rewritten quota interface. Implemented new quota format and
+ * formats registering.
+ * Jan Kara, <jack@suse.cz>, 2001,2002
+ *
+ * New SMP locking.
+ * Jan Kara, <jack@suse.cz>, 10/2002
+ *
+ * Added journalled quota support, fix lock inversion problems
+ * Jan Kara, <jack@suse.cz>, 2003,2004
+ *
+ * (C) Copyright 1994 - 1997 Marco van Wieringen
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/mm.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/tty.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/security.h>
+#include <linux/kmod.h>
+#include <linux/namei.h>
+#include <linux/buffer_head.h>
+#include <linux/capability.h>
+#include <linux/quotaops.h>
+#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
+#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#endif
+
+#include <asm/uaccess.h>
+
+#define __DQUOT_PARANOIA
+
+/*
+ * There are three quota SMP locks. dq_list_lock protects all lists with quotas
+ * and quota formats, dqstats structure containing statistics about the lists
+ * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
+ * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
+ * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
+ * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
+ * modifications of quota state (on quotaon and quotaoff) and readers who care
+ * about latest values take it as well.
+ *
+ * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
+ * dq_list_lock > dq_state_lock
+ *
+ * Note that some things (eg. sb pointer, type, id) doesn't change during
+ * the life of the dquot structure and so needn't to be protected by a lock
+ *
+ * Any operation working on dquots via inode pointers must hold dqptr_sem. If
+ * operation is just reading pointers from inode (or not using them at all) the
+ * read lock is enough. If pointers are altered function must hold write lock
+ * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
+ * for altering the flag i_mutex is also needed).
+ *
+ * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
+ * from inodes (dquot_alloc_space() and such don't check the dq_lock).
+ * Currently dquot is locked only when it is being read to memory (or space for
+ * it is being allocated) on the first dqget() and when it is being released on
+ * the last dqput(). The allocation and release oparations are serialized by
+ * the dq_lock and by checking the use count in dquot_release(). Write
+ * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
+ * spinlock to internal buffers before writing.
+ *
+ * Lock ordering (including related VFS locks) is the following:
+ * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
+ * dqio_mutex
+ * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
+ * dqptr_sem. But filesystem has to count with the fact that functions such as
+ * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
+ * from inside a transaction to keep filesystem consistency after a crash. Also
+ * filesystems usually want to do some IO on dquot from ->mark_dirty which is
+ * called with dqptr_sem held.
+ * i_mutex on quota files is special (it's below dqio_mutex)
+ */
+
+static DEFINE_SPINLOCK(dq_list_lock);
+static DEFINE_SPINLOCK(dq_state_lock);
+DEFINE_SPINLOCK(dq_data_lock);
+EXPORT_SYMBOL(dq_data_lock);
+
+static char *quotatypes[] = INITQFNAMES;
+static struct quota_format_type *quota_formats; /* List of registered formats */
+static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
+
+/* SLAB cache for dquot structures */
+static struct kmem_cache *dquot_cachep;
+
+int register_quota_format(struct quota_format_type *fmt)
+{
+ spin_lock(&dq_list_lock);
+ fmt->qf_next = quota_formats;
+ quota_formats = fmt;
+ spin_unlock(&dq_list_lock);
+ return 0;
+}
+EXPORT_SYMBOL(register_quota_format);
+
+void unregister_quota_format(struct quota_format_type *fmt)
+{
+ struct quota_format_type **actqf;
+
+ spin_lock(&dq_list_lock);
+ for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
+ if (*actqf)
+ *actqf = (*actqf)->qf_next;
+ spin_unlock(&dq_list_lock);
+}
+EXPORT_SYMBOL(unregister_quota_format);
+
+static struct quota_format_type *find_quota_format(int id)
+{
+ struct quota_format_type *actqf;
+
+ spin_lock(&dq_list_lock);
+ for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
+ if (!actqf || !try_module_get(actqf->qf_owner)) {
+ int qm;
+
+ spin_unlock(&dq_list_lock);
+
+ for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
+ if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
+ return NULL;
+
+ spin_lock(&dq_list_lock);
+ for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
+ if (actqf && !try_module_get(actqf->qf_owner))
+ actqf = NULL;
+ }
+ spin_unlock(&dq_list_lock);
+ return actqf;
+}
+
+static void put_quota_format(struct quota_format_type *fmt)
+{
+ module_put(fmt->qf_owner);
+}
+
+/*
+ * Dquot List Management:
+ * The quota code uses three lists for dquot management: the inuse_list,
+ * free_dquots, and dquot_hash[] array. A single dquot structure may be
+ * on all three lists, depending on its current state.
+ *
+ * All dquots are placed to the end of inuse_list when first created, and this
+ * list is used for invalidate operation, which must look at every dquot.
+ *
+ * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
+ * and this list is searched whenever we need an available dquot. Dquots are
+ * removed from the list as soon as they are used again, and
+ * dqstats.free_dquots gives the number of dquots on the list. When
+ * dquot is invalidated it's completely released from memory.
+ *
+ * Dquots with a specific identity (device, type and id) are placed on
+ * one of the dquot_hash[] hash chains. The provides an efficient search
+ * mechanism to locate a specific dquot.
+ */
+
+static LIST_HEAD(inuse_list);
+static LIST_HEAD(free_dquots);
+static unsigned int dq_hash_bits, dq_hash_mask;
+static struct hlist_head *dquot_hash;
+
+struct dqstats dqstats;
+EXPORT_SYMBOL(dqstats);
+
+static inline unsigned int
+hashfn(const struct super_block *sb, unsigned int id, int type)
+{
+ unsigned long tmp;
+
+ tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
+ return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
+}
+
+/*
+ * Following list functions expect dq_list_lock to be held
+ */
+static inline void insert_dquot_hash(struct dquot *dquot)
+{
+ struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
+ hlist_add_head(&dquot->dq_hash, head);
+}
+
+static inline void remove_dquot_hash(struct dquot *dquot)
+{
+ hlist_del_init(&dquot->dq_hash);
+}
+
+static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
+{
+ struct hlist_node *node;
+ struct dquot *dquot;
+
+ hlist_for_each (node, dquot_hash+hashent) {
+ dquot = hlist_entry(node, struct dquot, dq_hash);
+ if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
+ return dquot;
+ }
+ return NODQUOT;
+}
+
+/* Add a dquot to the tail of the free list */
+static inline void put_dquot_last(struct dquot *dquot)
+{
+ list_add_tail(&dquot->dq_free, &free_dquots);
+ dqstats.free_dquots++;
+}
+
+static inline void remove_free_dquot(struct dquot *dquot)
+{
+ if (list_empty(&dquot->dq_free))
+ return;
+ list_del_init(&dquot->dq_free);
+ dqstats.free_dquots--;
+}
+
+static inline void put_inuse(struct dquot *dquot)
+{
+ /* We add to the back of inuse list so we don't have to restart
+ * when traversing this list and we block */
+ list_add_tail(&dquot->dq_inuse, &inuse_list);
+ dqstats.allocated_dquots++;
+}
+
+static inline void remove_inuse(struct dquot *dquot)
+{
+ dqstats.allocated_dquots--;
+ list_del(&dquot->dq_inuse);
+}
+/*
+ * End of list functions needing dq_list_lock
+ */
+
+static void wait_on_dquot(struct dquot *dquot)
+{
+ mutex_lock(&dquot->dq_lock);
+ mutex_unlock(&dquot->dq_lock);
+}
+
+static inline int dquot_dirty(struct dquot *dquot)
+{
+ return test_bit(DQ_MOD_B, &dquot->dq_flags);
+}
+
+static inline int mark_dquot_dirty(struct dquot *dquot)
+{
+ return dquot->dq_sb->dq_op->mark_dirty(dquot);
+}
+
+int dquot_mark_dquot_dirty(struct dquot *dquot)
+{
+ spin_lock(&dq_list_lock);
+ if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
+ list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
+ info[dquot->dq_type].dqi_dirty_list);
+ spin_unlock(&dq_list_lock);
+ return 0;
+}
+EXPORT_SYMBOL(dquot_mark_dquot_dirty);
+
+/* This function needs dq_list_lock */
+static inline int clear_dquot_dirty(struct dquot *dquot)
+{
+ if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
+ return 0;
+ list_del_init(&dquot->dq_dirty);
+ return 1;
+}
+
+void mark_info_dirty(struct super_block *sb, int type)
+{
+ set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
+}
+EXPORT_SYMBOL(mark_info_dirty);
+
+/*
+ * Read dquot from disk and alloc space for it
+ */
+
+int dquot_acquire(struct dquot *dquot)
+{
+ int ret = 0, ret2 = 0;
+ struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
+
+ mutex_lock(&dquot->dq_lock);
+ mutex_lock(&dqopt->dqio_mutex);
+ if (!test_bit(DQ_READ_B, &dquot->dq_flags))
+ ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
+ if (ret < 0)
+ goto out_iolock;
+ set_bit(DQ_READ_B, &dquot->dq_flags);
+ /* Instantiate dquot if needed */
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
+ ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
+ /* Write the info if needed */
+ if (info_dirty(&dqopt->info[dquot->dq_type]))
+ ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
+ if (ret < 0)
+ goto out_iolock;
+ if (ret2 < 0) {
+ ret = ret2;
+ goto out_iolock;
+ }
+ }
+ set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
+out_iolock:
+ mutex_unlock(&dqopt->dqio_mutex);
+ mutex_unlock(&dquot->dq_lock);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_acquire);
+
+/*
+ * Write dquot to disk
+ */
+int dquot_commit(struct dquot *dquot)
+{
+ int ret = 0, ret2 = 0;
+ struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
+
+ mutex_lock(&dqopt->dqio_mutex);
+ spin_lock(&dq_list_lock);
+ if (!clear_dquot_dirty(dquot)) {
+ spin_unlock(&dq_list_lock);
+ goto out_sem;
+ }
+ spin_unlock(&dq_list_lock);
+ /* Inactive dquot can be only if there was error during read/init
+ * => we have better not writing it */
+ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
+ ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
+ if (info_dirty(&dqopt->info[dquot->dq_type]))
+ ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
+ if (ret >= 0)
+ ret = ret2;
+ }
+out_sem:
+ mutex_unlock(&dqopt->dqio_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_commit);
+
+/*
+ * Release dquot
+ */
+int dquot_release(struct dquot *dquot)
+{
+ int ret = 0, ret2 = 0;
+ struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
+
+ mutex_lock(&dquot->dq_lock);
+ /* Check whether we are not racing with some other dqget() */
+ if (atomic_read(&dquot->dq_count) > 1)
+ goto out_dqlock;
+ mutex_lock(&dqopt->dqio_mutex);
+ if (dqopt->ops[dquot->dq_type]->release_dqblk) {
+ ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
+ /* Write the info */
+ if (info_dirty(&dqopt->info[dquot->dq_type]))
+ ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
+ if (ret >= 0)
+ ret = ret2;
+ }
+ clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
+ mutex_unlock(&dqopt->dqio_mutex);
+out_dqlock:
+ mutex_unlock(&dquot->dq_lock);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_release);
+
+void dquot_destroy(struct dquot *dquot)
+{
+ kmem_cache_free(dquot_cachep, dquot);
+}
+EXPORT_SYMBOL(dquot_destroy);
+
+static inline void do_destroy_dquot(struct dquot *dquot)
+{
+ dquot->dq_sb->dq_op->destroy_dquot(dquot);
+}
+
+/* Invalidate all dquots on the list. Note that this function is called after
+ * quota is disabled and pointers from inodes removed so there cannot be new
+ * quota users. There can still be some users of quotas due to inodes being
+ * just deleted or pruned by prune_icache() (those are not attached to any
+ * list) or parallel quotactl call. We have to wait for such users.
+ */
+static void invalidate_dquots(struct super_block *sb, int type)
+{
+ struct dquot *dquot, *tmp;
+
+restart:
+ spin_lock(&dq_list_lock);
+ list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
+ if (dquot->dq_sb != sb)
+ continue;
+ if (dquot->dq_type != type)
+ continue;
+ /* Wait for dquot users */
+ if (atomic_read(&dquot->dq_count)) {
+ DEFINE_WAIT(wait);
+
+ atomic_inc(&dquot->dq_count);
+ prepare_to_wait(&dquot->dq_wait_unused, &wait,
+ TASK_UNINTERRUPTIBLE);
+ spin_unlock(&dq_list_lock);
+ /* Once dqput() wakes us up, we know it's time to free
+ * the dquot.
+ * IMPORTANT: we rely on the fact that there is always
+ * at most one process waiting for dquot to free.
+ * Otherwise dq_count would be > 1 and we would never
+ * wake up.
+ */
+ if (atomic_read(&dquot->dq_count) > 1)
+ schedule();
+ finish_wait(&dquot->dq_wait_unused, &wait);
+ dqput(dquot);
+ /* At this moment dquot() need not exist (it could be
+ * reclaimed by prune_dqcache(). Hence we must
+ * restart. */
+ goto restart;
+ }
+ /*
+ * Quota now has no users and it has been written on last
+ * dqput()
+ */
+ remove_dquot_hash(dquot);
+ remove_free_dquot(dquot);
+ remove_inuse(dquot);
+ do_destroy_dquot(dquot);
+ }
+ spin_unlock(&dq_list_lock);
+}
+
+/* Call callback for every active dquot on given filesystem */
+int dquot_scan_active(struct super_block *sb,
+ int (*fn)(struct dquot *dquot, unsigned long priv),
+ unsigned long priv)
+{
+ struct dquot *dquot, *old_dquot = NULL;
+ int ret = 0;
+
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ spin_lock(&dq_list_lock);
+ list_for_each_entry(dquot, &inuse_list, dq_inuse) {
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
+ continue;
+ if (dquot->dq_sb != sb)
+ continue;
+ /* Now we have active dquot so we can just increase use count */
+ atomic_inc(&dquot->dq_count);
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ dqput(old_dquot);
+ old_dquot = dquot;
+ ret = fn(dquot, priv);
+ if (ret < 0)
+ goto out;
+ spin_lock(&dq_list_lock);
+ /* We are safe to continue now because our dquot could not
+ * be moved out of the inuse list while we hold the reference */
+ }
+ spin_unlock(&dq_list_lock);
+out:
+ dqput(old_dquot);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_scan_active);
+
+int vfs_quota_sync(struct super_block *sb, int type)
+{
+ struct list_head *dirty;
+ struct dquot *dquot;
+ struct quota_info *dqopt = sb_dqopt(sb);
+ int cnt;
+
+ mutex_lock(&dqopt->dqonoff_mutex);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ spin_lock(&dq_list_lock);
+ dirty = &dqopt->info[cnt].dqi_dirty_list;
+ while (!list_empty(dirty)) {
+ dquot = list_first_entry(dirty, struct dquot, dq_dirty);
+ /* Dirty and inactive can be only bad dquot... */
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
+ clear_dquot_dirty(dquot);
+ continue;
+ }
+ /* Now we have active dquot from which someone is
+ * holding reference so we can safely just increase
+ * use count */
+ atomic_inc(&dquot->dq_count);
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ sb->dq_op->write_dquot(dquot);
+ dqput(dquot);
+ spin_lock(&dq_list_lock);
+ }
+ spin_unlock(&dq_list_lock);
+ }
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
+ && info_dirty(&dqopt->info[cnt]))
+ sb->dq_op->write_info(sb, cnt);
+ spin_lock(&dq_list_lock);
+ dqstats.syncs++;
+ spin_unlock(&dq_list_lock);
+ mutex_unlock(&dqopt->dqonoff_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(vfs_quota_sync);
+
+/* Free unused dquots from cache */
+static void prune_dqcache(int count)
+{
+ struct list_head *head;
+ struct dquot *dquot;
+
+ head = free_dquots.prev;
+ while (head != &free_dquots && count) {
+ dquot = list_entry(head, struct dquot, dq_free);
+ remove_dquot_hash(dquot);
+ remove_free_dquot(dquot);
+ remove_inuse(dquot);
+ do_destroy_dquot(dquot);
+ count--;
+ head = free_dquots.prev;
+ }
+}
+
+/*
+ * This is called from kswapd when we think we need some
+ * more memory
+ */
+
+static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
+{
+ if (nr) {
+ spin_lock(&dq_list_lock);
+ prune_dqcache(nr);
+ spin_unlock(&dq_list_lock);
+ }
+ return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
+}
+
+static struct shrinker dqcache_shrinker = {
+ .shrink = shrink_dqcache_memory,
+ .seeks = DEFAULT_SEEKS,
+};
+
+/*
+ * Put reference to dquot
+ * NOTE: If you change this function please check whether dqput_blocks() works right...
+ */
+void dqput(struct dquot *dquot)
+{
+ int ret;
+
+ if (!dquot)
+ return;
+#ifdef __DQUOT_PARANOIA
+ if (!atomic_read(&dquot->dq_count)) {
+ printk("VFS: dqput: trying to free free dquot\n");
+ printk("VFS: device %s, dquot of %s %d\n",
+ dquot->dq_sb->s_id,
+ quotatypes[dquot->dq_type],
+ dquot->dq_id);
+ BUG();
+ }
+#endif
+
+ spin_lock(&dq_list_lock);
+ dqstats.drops++;
+ spin_unlock(&dq_list_lock);
+we_slept:
+ spin_lock(&dq_list_lock);
+ if (atomic_read(&dquot->dq_count) > 1) {
+ /* We have more than one user... nothing to do */
+ atomic_dec(&dquot->dq_count);
+ /* Releasing dquot during quotaoff phase? */
+ if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
+ atomic_read(&dquot->dq_count) == 1)
+ wake_up(&dquot->dq_wait_unused);
+ spin_unlock(&dq_list_lock);
+ return;
+ }
+ /* Need to release dquot? */
+ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
+ spin_unlock(&dq_list_lock);
+ /* Commit dquot before releasing */
+ ret = dquot->dq_sb->dq_op->write_dquot(dquot);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: cannot write quota structure on "
+ "device %s (error %d). Quota may get out of "
+ "sync!\n", dquot->dq_sb->s_id, ret);
+ /*
+ * We clear dirty bit anyway, so that we avoid
+ * infinite loop here
+ */
+ spin_lock(&dq_list_lock);
+ clear_dquot_dirty(dquot);
+ spin_unlock(&dq_list_lock);
+ }
+ goto we_slept;
+ }
+ /* Clear flag in case dquot was inactive (something bad happened) */
+ clear_dquot_dirty(dquot);
+ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
+ spin_unlock(&dq_list_lock);
+ dquot->dq_sb->dq_op->release_dquot(dquot);
+ goto we_slept;
+ }
+ atomic_dec(&dquot->dq_count);
+#ifdef __DQUOT_PARANOIA
+ /* sanity check */
+ BUG_ON(!list_empty(&dquot->dq_free));
+#endif
+ put_dquot_last(dquot);
+ spin_unlock(&dq_list_lock);
+}
+EXPORT_SYMBOL(dqput);
+
+struct dquot *dquot_alloc(struct super_block *sb, int type)
+{
+ return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
+}
+EXPORT_SYMBOL(dquot_alloc);
+
+static struct dquot *get_empty_dquot(struct super_block *sb, int type)
+{
+ struct dquot *dquot;
+
+ dquot = sb->dq_op->alloc_dquot(sb, type);
+ if(!dquot)
+ return NODQUOT;
+
+ mutex_init(&dquot->dq_lock);
+ INIT_LIST_HEAD(&dquot->dq_free);
+ INIT_LIST_HEAD(&dquot->dq_inuse);
+ INIT_HLIST_NODE(&dquot->dq_hash);
+ INIT_LIST_HEAD(&dquot->dq_dirty);
+ init_waitqueue_head(&dquot->dq_wait_unused);
+ dquot->dq_sb = sb;
+ dquot->dq_type = type;
+ atomic_set(&dquot->dq_count, 1);
+
+ return dquot;
+}
+
+/*
+ * Get reference to dquot
+ *
+ * Locking is slightly tricky here. We are guarded from parallel quotaoff()
+ * destroying our dquot by:
+ * a) checking for quota flags under dq_list_lock and
+ * b) getting a reference to dquot before we release dq_list_lock
+ */
+struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
+{
+ unsigned int hashent = hashfn(sb, id, type);
+ struct dquot *dquot = NODQUOT, *empty = NODQUOT;
+
+ if (!sb_has_quota_active(sb, type))
+ return NODQUOT;
+we_slept:
+ spin_lock(&dq_list_lock);
+ spin_lock(&dq_state_lock);
+ if (!sb_has_quota_active(sb, type)) {
+ spin_unlock(&dq_state_lock);
+ spin_unlock(&dq_list_lock);
+ goto out;
+ }
+ spin_unlock(&dq_state_lock);
+
+ if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
+ if (empty == NODQUOT) {
+ spin_unlock(&dq_list_lock);
+ if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
+ schedule(); /* Try to wait for a moment... */
+ goto we_slept;
+ }
+ dquot = empty;
+ empty = NODQUOT;
+ dquot->dq_id = id;
+ /* all dquots go on the inuse_list */
+ put_inuse(dquot);
+ /* hash it first so it can be found */
+ insert_dquot_hash(dquot);
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ } else {
+ if (!atomic_read(&dquot->dq_count))
+ remove_free_dquot(dquot);
+ atomic_inc(&dquot->dq_count);
+ dqstats.cache_hits++;
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ }
+ /* Wait for dq_lock - after this we know that either dquot_release() is already
+ * finished or it will be canceled due to dq_count > 1 test */
+ wait_on_dquot(dquot);
+ /* Read the dquot and instantiate it (everything done only if needed) */
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
+ dqput(dquot);
+ dquot = NODQUOT;
+ goto out;
+ }
+#ifdef __DQUOT_PARANOIA
+ BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
+#endif
+out:
+ if (empty)
+ do_destroy_dquot(empty);
+
+ return dquot;
+}
+EXPORT_SYMBOL(dqget);
+
+static int dqinit_needed(struct inode *inode, int type)
+{
+ int cnt;
+
+ if (IS_NOQUOTA(inode))
+ return 0;
+ if (type != -1)
+ return inode->i_dquot[type] == NODQUOT;
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt] == NODQUOT)
+ return 1;
+ return 0;
+}
+
+/* This routine is guarded by dqonoff_mutex mutex */
+static void add_dquot_ref(struct super_block *sb, int type)
+{
+ struct inode *inode, *old_inode = NULL;
+
+ spin_lock(&inode_lock);
+ list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+ if (!atomic_read(&inode->i_writecount))
+ continue;
+ if (!dqinit_needed(inode, type))
+ continue;
+ if (inode->i_state & (I_FREEING|I_WILL_FREE))
+ continue;
+
+ __iget(inode);
+ spin_unlock(&inode_lock);
+
+ iput(old_inode);
+ sb->dq_op->initialize(inode, type);
+ /* We hold a reference to 'inode' so it couldn't have been
+ * removed from s_inodes list while we dropped the inode_lock.
+ * We cannot iput the inode now as we can be holding the last
+ * reference and we cannot iput it under inode_lock. So we
+ * keep the reference and iput it later. */
+ old_inode = inode;
+ spin_lock(&inode_lock);
+ }
+ spin_unlock(&inode_lock);
+ iput(old_inode);
+}
+
+/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
+static inline int dqput_blocks(struct dquot *dquot)
+{
+ if (atomic_read(&dquot->dq_count) <= 1)
+ return 1;
+ return 0;
+}
+
+/* Remove references to dquots from inode - add dquot to list for freeing if needed */
+/* We can't race with anybody because we hold dqptr_sem for writing... */
+static int remove_inode_dquot_ref(struct inode *inode, int type,
+ struct list_head *tofree_head)
+{
+ struct dquot *dquot = inode->i_dquot[type];
+
+ inode->i_dquot[type] = NODQUOT;
+ if (dquot != NODQUOT) {
+ if (dqput_blocks(dquot)) {
+#ifdef __DQUOT_PARANOIA
+ if (atomic_read(&dquot->dq_count) != 1)
+ printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
+#endif
+ spin_lock(&dq_list_lock);
+ list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
+ spin_unlock(&dq_list_lock);
+ return 1;
+ }
+ else
+ dqput(dquot); /* We have guaranteed we won't block */
+ }
+ return 0;
+}
+
+/* Free list of dquots - called from inode.c */
+/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
+static void put_dquot_list(struct list_head *tofree_head)
+{
+ struct list_head *act_head;
+ struct dquot *dquot;
+
+ act_head = tofree_head->next;
+ /* So now we have dquots on the list... Just free them */
+ while (act_head != tofree_head) {
+ dquot = list_entry(act_head, struct dquot, dq_free);
+ act_head = act_head->next;
+ list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
+ dqput(dquot);
+ }
+}
+
+static void remove_dquot_ref(struct super_block *sb, int type,
+ struct list_head *tofree_head)
+{
+ struct inode *inode;
+
+ spin_lock(&inode_lock);
+ list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+ if (!IS_NOQUOTA(inode))
+ remove_inode_dquot_ref(inode, type, tofree_head);
+ }
+ spin_unlock(&inode_lock);
+}
+
+/* Gather all references from inodes and drop them */
+static void drop_dquot_ref(struct super_block *sb, int type)
+{
+ LIST_HEAD(tofree_head);
+
+ if (sb->dq_op) {
+ down_write(&sb_dqopt(sb)->dqptr_sem);
+ remove_dquot_ref(sb, type, &tofree_head);
+ up_write(&sb_dqopt(sb)->dqptr_sem);
+ put_dquot_list(&tofree_head);
+ }
+}
+
+static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
+{
+ dquot->dq_dqb.dqb_curinodes += number;
+}
+
+static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
+{
+ dquot->dq_dqb.dqb_curspace += number;
+}
+
+static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
+{
+ dquot->dq_dqb.dqb_rsvspace += number;
+}
+
+/*
+ * Claim reserved quota space
+ */
+static void dquot_claim_reserved_space(struct dquot *dquot,
+ qsize_t number)
+{
+ WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
+ dquot->dq_dqb.dqb_curspace += number;
+ dquot->dq_dqb.dqb_rsvspace -= number;
+}
+
+static inline
+void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
+{
+ dquot->dq_dqb.dqb_rsvspace -= number;
+}
+
+static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
+{
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
+ dquot->dq_dqb.dqb_curinodes >= number)
+ dquot->dq_dqb.dqb_curinodes -= number;
+ else
+ dquot->dq_dqb.dqb_curinodes = 0;
+ if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
+ dquot->dq_dqb.dqb_itime = (time_t) 0;
+ clear_bit(DQ_INODES_B, &dquot->dq_flags);
+}
+
+static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
+{
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
+ dquot->dq_dqb.dqb_curspace >= number)
+ dquot->dq_dqb.dqb_curspace -= number;
+ else
+ dquot->dq_dqb.dqb_curspace = 0;
+ if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
+ dquot->dq_dqb.dqb_btime = (time_t) 0;
+ clear_bit(DQ_BLKS_B, &dquot->dq_flags);
+}
+
+static int warning_issued(struct dquot *dquot, const int warntype)
+{
+ int flag = (warntype == QUOTA_NL_BHARDWARN ||
+ warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
+ ((warntype == QUOTA_NL_IHARDWARN ||
+ warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
+
+ if (!flag)
+ return 0;
+ return test_and_set_bit(flag, &dquot->dq_flags);
+}
+
+#ifdef CONFIG_PRINT_QUOTA_WARNING
+static int flag_print_warnings = 1;
+
+static inline int need_print_warning(struct dquot *dquot)
+{
+ if (!flag_print_warnings)
+ return 0;
+
+ switch (dquot->dq_type) {
+ case USRQUOTA:
+ return current_fsuid() == dquot->dq_id;
+ case GRPQUOTA:
+ return in_group_p(dquot->dq_id);
+ }
+ return 0;
+}
+
+/* Print warning to user which exceeded quota */
+static void print_warning(struct dquot *dquot, const int warntype)
+{
+ char *msg = NULL;
+ struct tty_struct *tty;
+
+ if (warntype == QUOTA_NL_IHARDBELOW ||
+ warntype == QUOTA_NL_ISOFTBELOW ||
+ warntype == QUOTA_NL_BHARDBELOW ||
+ warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
+ return;
+
+ tty = get_current_tty();
+ if (!tty)
+ return;
+ tty_write_message(tty, dquot->dq_sb->s_id);
+ if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
+ tty_write_message(tty, ": warning, ");
+ else
+ tty_write_message(tty, ": write failed, ");
+ tty_write_message(tty, quotatypes[dquot->dq_type]);
+ switch (warntype) {
+ case QUOTA_NL_IHARDWARN:
+ msg = " file limit reached.\r\n";
+ break;
+ case QUOTA_NL_ISOFTLONGWARN:
+ msg = " file quota exceeded too long.\r\n";
+ break;
+ case QUOTA_NL_ISOFTWARN:
+ msg = " file quota exceeded.\r\n";
+ break;
+ case QUOTA_NL_BHARDWARN:
+ msg = " block limit reached.\r\n";
+ break;
+ case QUOTA_NL_BSOFTLONGWARN:
+ msg = " block quota exceeded too long.\r\n";
+ break;
+ case QUOTA_NL_BSOFTWARN:
+ msg = " block quota exceeded.\r\n";
+ break;
+ }
+ tty_write_message(tty, msg);
+ tty_kref_put(tty);
+}
+#endif
+
+#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
+
+/* Netlink family structure for quota */
+static struct genl_family quota_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = 0,
+ .name = "VFS_DQUOT",
+ .version = 1,
+ .maxattr = QUOTA_NL_A_MAX,
+};
+
+/* Send warning to userspace about user which exceeded quota */
+static void send_warning(const struct dquot *dquot, const char warntype)
+{
+ static atomic_t seq;
+ struct sk_buff *skb;
+ void *msg_head;
+ int ret;
+ int msg_size = 4 * nla_total_size(sizeof(u32)) +
+ 2 * nla_total_size(sizeof(u64));
+
+ /* We have to allocate using GFP_NOFS as we are called from a
+ * filesystem performing write and thus further recursion into
+ * the fs to free some data could cause deadlocks. */
+ skb = genlmsg_new(msg_size, GFP_NOFS);
+ if (!skb) {
+ printk(KERN_ERR
+ "VFS: Not enough memory to send quota warning.\n");
+ return;
+ }
+ msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
+ "a_genl_family, 0, QUOTA_NL_C_WARNING);
+ if (!msg_head) {
+ printk(KERN_ERR
+ "VFS: Cannot store netlink header in quota warning.\n");
+ goto err_out;
+ }
+ ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
+ if (ret)
+ goto attr_err_out;
+ ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
+ if (ret)
+ goto attr_err_out;
+ ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
+ if (ret)
+ goto attr_err_out;
+ ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
+ MAJOR(dquot->dq_sb->s_dev));
+ if (ret)
+ goto attr_err_out;
+ ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
+ MINOR(dquot->dq_sb->s_dev));
+ if (ret)
+ goto attr_err_out;
+ ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
+ if (ret)
+ goto attr_err_out;
+ genlmsg_end(skb, msg_head);
+
+ ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
+ if (ret < 0 && ret != -ESRCH)
+ printk(KERN_ERR
+ "VFS: Failed to send notification message: %d\n", ret);
+ return;
+attr_err_out:
+ printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
+err_out:
+ kfree_skb(skb);
+}
+#endif
+/*
+ * Write warnings to the console and send warning messages over netlink.
+ *
+ * Note that this function can sleep.
+ */
+static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
+{
+ int i;
+
+ for (i = 0; i < MAXQUOTAS; i++)
+ if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
+ !warning_issued(dquots[i], warntype[i])) {
+#ifdef CONFIG_PRINT_QUOTA_WARNING
+ print_warning(dquots[i], warntype[i]);
+#endif
+#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
+ send_warning(dquots[i], warntype[i]);
+#endif
+ }
+}
+
+static inline char ignore_hardlimit(struct dquot *dquot)
+{
+ struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
+
+ return capable(CAP_SYS_RESOURCE) &&
+ (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
+}
+
+/* needs dq_data_lock */
+static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
+{
+ *warntype = QUOTA_NL_NOWARN;
+ if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
+ test_bit(DQ_FAKE_B, &dquot->dq_flags))
+ return QUOTA_OK;
+
+ if (dquot->dq_dqb.dqb_ihardlimit &&
+ (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
+ !ignore_hardlimit(dquot)) {
+ *warntype = QUOTA_NL_IHARDWARN;
+ return NO_QUOTA;
+ }
+
+ if (dquot->dq_dqb.dqb_isoftlimit &&
+ (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
+ dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
+ !ignore_hardlimit(dquot)) {
+ *warntype = QUOTA_NL_ISOFTLONGWARN;
+ return NO_QUOTA;
+ }
+
+ if (dquot->dq_dqb.dqb_isoftlimit &&
+ (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
+ dquot->dq_dqb.dqb_itime == 0) {
+ *warntype = QUOTA_NL_ISOFTWARN;
+ dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
+ }
+
+ return QUOTA_OK;
+}
+
+/* needs dq_data_lock */
+static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
+{
+ qsize_t tspace;
+
+ *warntype = QUOTA_NL_NOWARN;
+ if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
+ test_bit(DQ_FAKE_B, &dquot->dq_flags))
+ return QUOTA_OK;
+
+ tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
+ + space;
+
+ if (dquot->dq_dqb.dqb_bhardlimit &&
+ tspace > dquot->dq_dqb.dqb_bhardlimit &&
+ !ignore_hardlimit(dquot)) {
+ if (!prealloc)
+ *warntype = QUOTA_NL_BHARDWARN;
+ return NO_QUOTA;
+ }
+
+ if (dquot->dq_dqb.dqb_bsoftlimit &&
+ tspace > dquot->dq_dqb.dqb_bsoftlimit &&
+ dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
+ !ignore_hardlimit(dquot)) {
+ if (!prealloc)
+ *warntype = QUOTA_NL_BSOFTLONGWARN;
+ return NO_QUOTA;
+ }
+
+ if (dquot->dq_dqb.dqb_bsoftlimit &&
+ tspace > dquot->dq_dqb.dqb_bsoftlimit &&
+ dquot->dq_dqb.dqb_btime == 0) {
+ if (!prealloc) {
+ *warntype = QUOTA_NL_BSOFTWARN;
+ dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
+ }
+ else
+ /*
+ * We don't allow preallocation to exceed softlimit so exceeding will
+ * be always printed
+ */
+ return NO_QUOTA;
+ }
+
+ return QUOTA_OK;
+}
+
+static int info_idq_free(struct dquot *dquot, qsize_t inodes)
+{
+ if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
+ dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
+ !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
+ return QUOTA_NL_NOWARN;
+
+ if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
+ return QUOTA_NL_ISOFTBELOW;
+ if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
+ dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit)
+ return QUOTA_NL_IHARDBELOW;
+ return QUOTA_NL_NOWARN;
+}
+
+static int info_bdq_free(struct dquot *dquot, qsize_t space)
+{
+ if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
+ dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
+ return QUOTA_NL_NOWARN;
+
+ if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
+ return QUOTA_NL_BSOFTBELOW;
+ if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
+ dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
+ return QUOTA_NL_BHARDBELOW;
+ return QUOTA_NL_NOWARN;
+}
+/*
+ * Initialize quota pointers in inode
+ * We do things in a bit complicated way but by that we avoid calling
+ * dqget() and thus filesystem callbacks under dqptr_sem.
+ */
+int dquot_initialize(struct inode *inode, int type)
+{
+ unsigned int id = 0;
+ int cnt, ret = 0;
+ struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT };
+ struct super_block *sb = inode->i_sb;
+
+ /* First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex */
+ if (IS_NOQUOTA(inode))
+ return 0;
+
+ /* First get references to structures we might need. */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ switch (cnt) {
+ case USRQUOTA:
+ id = inode->i_uid;
+ break;
+ case GRPQUOTA:
+ id = inode->i_gid;
+ break;
+ }
+ got[cnt] = dqget(sb, id, cnt);
+ }
+
+ down_write(&sb_dqopt(sb)->dqptr_sem);
+ /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
+ if (IS_NOQUOTA(inode))
+ goto out_err;
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ /* Avoid races with quotaoff() */
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ if (inode->i_dquot[cnt] == NODQUOT) {
+ inode->i_dquot[cnt] = got[cnt];
+ got[cnt] = NODQUOT;
+ }
+ }
+out_err:
+ up_write(&sb_dqopt(sb)->dqptr_sem);
+ /* Drop unused references */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ dqput(got[cnt]);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_initialize);
+
+/*
+ * Release all quotas referenced by inode
+ */
+int dquot_drop(struct inode *inode)
+{
+ int cnt;
+ struct dquot *put[MAXQUOTAS];
+
+ down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ put[cnt] = inode->i_dquot[cnt];
+ inode->i_dquot[cnt] = NODQUOT;
+ }
+ up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ dqput(put[cnt]);
+ return 0;
+}
+EXPORT_SYMBOL(dquot_drop);
+
+/* Wrapper to remove references to quota structures from inode */
+void vfs_dq_drop(struct inode *inode)
+{
+ /* Here we can get arbitrary inode from clear_inode() so we have
+ * to be careful. OTOH we don't need locking as quota operations
+ * are allowed to change only at mount time */
+ if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
+ && inode->i_sb->dq_op->drop) {
+ int cnt;
+ /* Test before calling to rule out calls from proc and such
+ * where we are not allowed to block. Note that this is
+ * actually reliable test even without the lock - the caller
+ * must assure that nobody can come after the DQUOT_DROP and
+ * add quota pointers back anyway */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt] != NODQUOT)
+ break;
+ if (cnt < MAXQUOTAS)
+ inode->i_sb->dq_op->drop(inode);
+ }
+}
+EXPORT_SYMBOL(vfs_dq_drop);
+
+/*
+ * Following four functions update i_blocks+i_bytes fields and
+ * quota information (together with appropriate checks)
+ * NOTE: We absolutely rely on the fact that caller dirties
+ * the inode (usually macros in quotaops.h care about this) and
+ * holds a handle for the current transaction so that dquot write and
+ * inode write go into the same transaction.
+ */
+
+/*
+ * This operation can block, but only after everything is updated
+ */
+int __dquot_alloc_space(struct inode *inode, qsize_t number,
+ int warn, int reserve)
+{
+ int cnt, ret = QUOTA_OK;
+ char warntype[MAXQUOTAS];
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ warntype[cnt] = QUOTA_NL_NOWARN;
+
+ spin_lock(&dq_data_lock);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
+ == NO_QUOTA) {
+ ret = NO_QUOTA;
+ goto out_unlock;
+ }
+ }
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ if (reserve)
+ dquot_resv_space(inode->i_dquot[cnt], number);
+ else
+ dquot_incr_space(inode->i_dquot[cnt], number);
+ }
+ if (!reserve)
+ inode_add_bytes(inode, number);
+out_unlock:
+ spin_unlock(&dq_data_lock);
+ flush_warnings(inode->i_dquot, warntype);
+ return ret;
+}
+
+int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
+{
+ int cnt, ret = QUOTA_OK;
+
+ /*
+ * First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex
+ */
+ if (IS_NOQUOTA(inode)) {
+ inode_add_bytes(inode, number);
+ goto out;
+ }
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode)) {
+ inode_add_bytes(inode, number);
+ goto out_unlock;
+ }
+
+ ret = __dquot_alloc_space(inode, number, warn, 0);
+ if (ret == NO_QUOTA)
+ goto out_unlock;
+
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+out_unlock:
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+ return ret;
+}
+EXPORT_SYMBOL(dquot_alloc_space);
+
+int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
+{
+ int ret = QUOTA_OK;
+
+ if (IS_NOQUOTA(inode))
+ goto out;
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode))
+ goto out_unlock;
+
+ ret = __dquot_alloc_space(inode, number, warn, 1);
+out_unlock:
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+ return ret;
+}
+EXPORT_SYMBOL(dquot_reserve_space);
+
+/*
+ * This operation can block, but only after everything is updated
+ */
+int dquot_alloc_inode(const struct inode *inode, qsize_t number)
+{
+ int cnt, ret = NO_QUOTA;
+ char warntype[MAXQUOTAS];
+
+ /* First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex */
+ if (IS_NOQUOTA(inode))
+ return QUOTA_OK;
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ warntype[cnt] = QUOTA_NL_NOWARN;
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode)) {
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return QUOTA_OK;
+ }
+ spin_lock(&dq_data_lock);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
+ goto warn_put_all;
+ }
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ dquot_incr_inodes(inode->i_dquot[cnt], number);
+ }
+ ret = QUOTA_OK;
+warn_put_all:
+ spin_unlock(&dq_data_lock);
+ if (ret == QUOTA_OK)
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+ flush_warnings(inode->i_dquot, warntype);
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_alloc_inode);
+
+int dquot_claim_space(struct inode *inode, qsize_t number)
+{
+ int cnt;
+ int ret = QUOTA_OK;
+
+ if (IS_NOQUOTA(inode)) {
+ inode_add_bytes(inode, number);
+ goto out;
+ }
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode)) {
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ inode_add_bytes(inode, number);
+ goto out;
+ }
+
+ spin_lock(&dq_data_lock);
+ /* Claim reserved quotas to allocated quotas */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] != NODQUOT)
+ dquot_claim_reserved_space(inode->i_dquot[cnt],
+ number);
+ }
+ /* Update inode bytes */
+ inode_add_bytes(inode, number);
+ spin_unlock(&dq_data_lock);
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+ return ret;
+}
+EXPORT_SYMBOL(dquot_claim_space);
+
+/*
+ * Release reserved quota space
+ */
+void dquot_release_reserved_space(struct inode *inode, qsize_t number)
+{
+ int cnt;
+
+ if (IS_NOQUOTA(inode))
+ goto out;
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode))
+ goto out_unlock;
+
+ spin_lock(&dq_data_lock);
+ /* Release reserved dquots */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] != NODQUOT)
+ dquot_free_reserved_space(inode->i_dquot[cnt], number);
+ }
+ spin_unlock(&dq_data_lock);
+
+out_unlock:
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+ return;
+}
+EXPORT_SYMBOL(dquot_release_reserved_space);
+
+/*
+ * This operation can block, but only after everything is updated
+ */
+int dquot_free_space(struct inode *inode, qsize_t number)
+{
+ unsigned int cnt;
+ char warntype[MAXQUOTAS];
+
+ /* First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex */
+ if (IS_NOQUOTA(inode)) {
+out_sub:
+ inode_sub_bytes(inode, number);
+ return QUOTA_OK;
+ }
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ /* Now recheck reliably when holding dqptr_sem */
+ if (IS_NOQUOTA(inode)) {
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ goto out_sub;
+ }
+ spin_lock(&dq_data_lock);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
+ dquot_decr_space(inode->i_dquot[cnt], number);
+ }
+ inode_sub_bytes(inode, number);
+ spin_unlock(&dq_data_lock);
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+ flush_warnings(inode->i_dquot, warntype);
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return QUOTA_OK;
+}
+EXPORT_SYMBOL(dquot_free_space);
+
+/*
+ * This operation can block, but only after everything is updated
+ */
+int dquot_free_inode(const struct inode *inode, qsize_t number)
+{
+ unsigned int cnt;
+ char warntype[MAXQUOTAS];
+
+ /* First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex */
+ if (IS_NOQUOTA(inode))
+ return QUOTA_OK;
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ /* Now recheck reliably when holding dqptr_sem */
+ if (IS_NOQUOTA(inode)) {
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return QUOTA_OK;
+ }
+ spin_lock(&dq_data_lock);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] == NODQUOT)
+ continue;
+ warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
+ dquot_decr_inodes(inode->i_dquot[cnt], number);
+ }
+ spin_unlock(&dq_data_lock);
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+ flush_warnings(inode->i_dquot, warntype);
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return QUOTA_OK;
+}
+EXPORT_SYMBOL(dquot_free_inode);
+
+/*
+ * call back function, get reserved quota space from underlying fs
+ */
+qsize_t dquot_get_reserved_space(struct inode *inode)
+{
+ qsize_t reserved_space = 0;
+
+ if (sb_any_quota_active(inode->i_sb) &&
+ inode->i_sb->dq_op->get_reserved_space)
+ reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
+ return reserved_space;
+}
+
+/*
+ * Transfer the number of inode and blocks from one diskquota to an other.
+ *
+ * This operation can block, but only after everything is updated
+ * A transaction must be started when entering this function.
+ */
+int dquot_transfer(struct inode *inode, struct iattr *iattr)
+{
+ qsize_t space, cur_space;
+ qsize_t rsv_space = 0;
+ struct dquot *transfer_from[MAXQUOTAS];
+ struct dquot *transfer_to[MAXQUOTAS];
+ int cnt, ret = QUOTA_OK;
+ int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
+ chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
+ char warntype_to[MAXQUOTAS];
+ char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
+
+ /* First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex */
+ if (IS_NOQUOTA(inode))
+ return QUOTA_OK;
+ /* Initialize the arrays */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ transfer_from[cnt] = NODQUOT;
+ transfer_to[cnt] = NODQUOT;
+ warntype_to[cnt] = QUOTA_NL_NOWARN;
+ switch (cnt) {
+ case USRQUOTA:
+ if (!chuid)
+ continue;
+ transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
+ break;
+ case GRPQUOTA:
+ if (!chgid)
+ continue;
+ transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
+ break;
+ }
+ }
+
+ down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ /* Now recheck reliably when holding dqptr_sem */
+ if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
+ up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ goto put_all;
+ }
+ spin_lock(&dq_data_lock);
+ cur_space = inode_get_bytes(inode);
+ rsv_space = dquot_get_reserved_space(inode);
+ space = cur_space + rsv_space;
+ /* Build the transfer_from list and check the limits */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (transfer_to[cnt] == NODQUOT)
+ continue;
+ transfer_from[cnt] = inode->i_dquot[cnt];
+ if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
+ NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
+ warntype_to + cnt) == NO_QUOTA)
+ goto over_quota;
+ }
+
+ /*
+ * Finally perform the needed transfer from transfer_from to transfer_to
+ */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ /*
+ * Skip changes for same uid or gid or for turned off quota-type.
+ */
+ if (transfer_to[cnt] == NODQUOT)
+ continue;
+
+ /* Due to IO error we might not have transfer_from[] structure */
+ if (transfer_from[cnt]) {
+ warntype_from_inodes[cnt] =
+ info_idq_free(transfer_from[cnt], 1);
+ warntype_from_space[cnt] =
+ info_bdq_free(transfer_from[cnt], space);
+ dquot_decr_inodes(transfer_from[cnt], 1);
+ dquot_decr_space(transfer_from[cnt], cur_space);
+ dquot_free_reserved_space(transfer_from[cnt],
+ rsv_space);
+ }
+
+ dquot_incr_inodes(transfer_to[cnt], 1);
+ dquot_incr_space(transfer_to[cnt], cur_space);
+ dquot_resv_space(transfer_to[cnt], rsv_space);
+
+ inode->i_dquot[cnt] = transfer_to[cnt];
+ }
+ spin_unlock(&dq_data_lock);
+ up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (transfer_from[cnt])
+ mark_dquot_dirty(transfer_from[cnt]);
+ if (transfer_to[cnt]) {
+ mark_dquot_dirty(transfer_to[cnt]);
+ /* The reference we got is transferred to the inode */
+ transfer_to[cnt] = NODQUOT;
+ }
+ }
+warn_put_all:
+ flush_warnings(transfer_to, warntype_to);
+ flush_warnings(transfer_from, warntype_from_inodes);
+ flush_warnings(transfer_from, warntype_from_space);
+put_all:
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ dqput(transfer_from[cnt]);
+ dqput(transfer_to[cnt]);
+ }
+ return ret;
+over_quota:
+ spin_unlock(&dq_data_lock);
+ up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ /* Clear dquot pointers we don't want to dqput() */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ transfer_from[cnt] = NODQUOT;
+ ret = NO_QUOTA;
+ goto warn_put_all;
+}
+EXPORT_SYMBOL(dquot_transfer);
+
+/* Wrapper for transferring ownership of an inode */
+int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
+{
+ if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
+ vfs_dq_init(inode);
+ if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(vfs_dq_transfer);
+
+/*
+ * Write info of quota file to disk
+ */
+int dquot_commit_info(struct super_block *sb, int type)
+{
+ int ret;
+ struct quota_info *dqopt = sb_dqopt(sb);
+
+ mutex_lock(&dqopt->dqio_mutex);
+ ret = dqopt->ops[type]->write_file_info(sb, type);
+ mutex_unlock(&dqopt->dqio_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(dquot_commit_info);
+
+/*
+ * Definitions of diskquota operations.
+ */
+struct dquot_operations dquot_operations = {
+ .initialize = dquot_initialize,
+ .drop = dquot_drop,
+ .alloc_space = dquot_alloc_space,
+ .alloc_inode = dquot_alloc_inode,
+ .free_space = dquot_free_space,
+ .free_inode = dquot_free_inode,
+ .transfer = dquot_transfer,
+ .write_dquot = dquot_commit,
+ .acquire_dquot = dquot_acquire,
+ .release_dquot = dquot_release,
+ .mark_dirty = dquot_mark_dquot_dirty,
+ .write_info = dquot_commit_info,
+ .alloc_dquot = dquot_alloc,
+ .destroy_dquot = dquot_destroy,
+};
+
+/*
+ * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
+ */
+int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
+{
+ int cnt, ret = 0;
+ struct quota_info *dqopt = sb_dqopt(sb);
+ struct inode *toputinode[MAXQUOTAS];
+
+ /* Cannot turn off usage accounting without turning off limits, or
+ * suspend quotas and simultaneously turn quotas off. */
+ if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
+ || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
+ DQUOT_USAGE_ENABLED)))
+ return -EINVAL;
+
+ /* We need to serialize quota_off() for device */
+ mutex_lock(&dqopt->dqonoff_mutex);
+
+ /*
+ * Skip everything if there's nothing to do. We have to do this because
+ * sometimes we are called when fill_super() failed and calling
+ * sync_fs() in such cases does no good.
+ */
+ if (!sb_any_quota_loaded(sb)) {
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ return 0;
+ }
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ toputinode[cnt] = NULL;
+ if (type != -1 && cnt != type)
+ continue;
+ if (!sb_has_quota_loaded(sb, cnt))
+ continue;
+
+ if (flags & DQUOT_SUSPENDED) {
+ spin_lock(&dq_state_lock);
+ dqopt->flags |=
+ dquot_state_flag(DQUOT_SUSPENDED, cnt);
+ spin_unlock(&dq_state_lock);
+ } else {
+ spin_lock(&dq_state_lock);
+ dqopt->flags &= ~dquot_state_flag(flags, cnt);
+ /* Turning off suspended quotas? */
+ if (!sb_has_quota_loaded(sb, cnt) &&
+ sb_has_quota_suspended(sb, cnt)) {
+ dqopt->flags &= ~dquot_state_flag(
+ DQUOT_SUSPENDED, cnt);
+ spin_unlock(&dq_state_lock);
+ iput(dqopt->files[cnt]);
+ dqopt->files[cnt] = NULL;
+ continue;
+ }
+ spin_unlock(&dq_state_lock);
+ }
+
+ /* We still have to keep quota loaded? */
+ if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
+ continue;
+
+ /* Note: these are blocking operations */
+ drop_dquot_ref(sb, cnt);
+ invalidate_dquots(sb, cnt);
+ /*
+ * Now all dquots should be invalidated, all writes done so we should be only
+ * users of the info. No locks needed.
+ */
+ if (info_dirty(&dqopt->info[cnt]))
+ sb->dq_op->write_info(sb, cnt);
+ if (dqopt->ops[cnt]->free_file_info)
+ dqopt->ops[cnt]->free_file_info(sb, cnt);
+ put_quota_format(dqopt->info[cnt].dqi_format);
+
+ toputinode[cnt] = dqopt->files[cnt];
+ if (!sb_has_quota_loaded(sb, cnt))
+ dqopt->files[cnt] = NULL;
+ dqopt->info[cnt].dqi_flags = 0;
+ dqopt->info[cnt].dqi_igrace = 0;
+ dqopt->info[cnt].dqi_bgrace = 0;
+ dqopt->ops[cnt] = NULL;
+ }
+ mutex_unlock(&dqopt->dqonoff_mutex);
+
+ /* Skip syncing and setting flags if quota files are hidden */
+ if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
+ goto put_inodes;
+
+ /* Sync the superblock so that buffers with quota data are written to
+ * disk (and so userspace sees correct data afterwards). */
+ if (sb->s_op->sync_fs)
+ sb->s_op->sync_fs(sb, 1);
+ sync_blockdev(sb->s_bdev);
+ /* Now the quota files are just ordinary files and we can set the
+ * inode flags back. Moreover we discard the pagecache so that
+ * userspace sees the writes we did bypassing the pagecache. We
+ * must also discard the blockdev buffers so that we see the
+ * changes done by userspace on the next quotaon() */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (toputinode[cnt]) {
+ mutex_lock(&dqopt->dqonoff_mutex);
+ /* If quota was reenabled in the meantime, we have
+ * nothing to do */
+ if (!sb_has_quota_loaded(sb, cnt)) {
+ mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
+ toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
+ S_NOATIME | S_NOQUOTA);
+ truncate_inode_pages(&toputinode[cnt]->i_data, 0);
+ mutex_unlock(&toputinode[cnt]->i_mutex);
+ mark_inode_dirty(toputinode[cnt]);
+ }
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ }
+ if (sb->s_bdev)
+ invalidate_bdev(sb->s_bdev);
+put_inodes:
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (toputinode[cnt]) {
+ /* On remount RO, we keep the inode pointer so that we
+ * can reenable quota on the subsequent remount RW. We
+ * have to check 'flags' variable and not use sb_has_
+ * function because another quotaon / quotaoff could
+ * change global state before we got here. We refuse
+ * to suspend quotas when there is pending delete on
+ * the quota file... */
+ if (!(flags & DQUOT_SUSPENDED))
+ iput(toputinode[cnt]);
+ else if (!toputinode[cnt]->i_nlink)
+ ret = -EBUSY;
+ }
+ return ret;
+}
+EXPORT_SYMBOL(vfs_quota_disable);
+
+int vfs_quota_off(struct super_block *sb, int type, int remount)
+{
+ return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
+ (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
+}
+EXPORT_SYMBOL(vfs_quota_off);
+/*
+ * Turn quotas on on a device
+ */
+
+/*
+ * Helper function to turn quotas on when we already have the inode of
+ * quota file and no quota information is loaded.
+ */
+static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
+ unsigned int flags)
+{
+ struct quota_format_type *fmt = find_quota_format(format_id);
+ struct super_block *sb = inode->i_sb;
+ struct quota_info *dqopt = sb_dqopt(sb);
+ int error;
+ int oldflags = -1;
+
+ if (!fmt)
+ return -ESRCH;
+ if (!S_ISREG(inode->i_mode)) {
+ error = -EACCES;
+ goto out_fmt;
+ }
+ if (IS_RDONLY(inode)) {
+ error = -EROFS;
+ goto out_fmt;
+ }
+ if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
+ error = -EINVAL;
+ goto out_fmt;
+ }
+ /* Usage always has to be set... */
+ if (!(flags & DQUOT_USAGE_ENABLED)) {
+ error = -EINVAL;
+ goto out_fmt;
+ }
+
+ if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
+ /* As we bypass the pagecache we must now flush the inode so
+ * that we see all the changes from userspace... */
+ write_inode_now(inode, 1);
+ /* And now flush the block cache so that kernel sees the
+ * changes */
+ invalidate_bdev(sb->s_bdev);
+ }
+ mutex_lock(&inode->i_mutex);
+ mutex_lock(&dqopt->dqonoff_mutex);
+ if (sb_has_quota_loaded(sb, type)) {
+ error = -EBUSY;
+ goto out_lock;
+ }
+
+ if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
+ /* We don't want quota and atime on quota files (deadlocks
+ * possible) Also nobody should write to the file - we use
+ * special IO operations which ignore the immutable bit. */
+ down_write(&dqopt->dqptr_sem);
+ oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
+ inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
+ up_write(&dqopt->dqptr_sem);
+ sb->dq_op->drop(inode);
+ }
+
+ error = -EIO;
+ dqopt->files[type] = igrab(inode);
+ if (!dqopt->files[type])
+ goto out_lock;
+ error = -EINVAL;
+ if (!fmt->qf_ops->check_quota_file(sb, type))
+ goto out_file_init;
+
+ dqopt->ops[type] = fmt->qf_ops;
+ dqopt->info[type].dqi_format = fmt;
+ dqopt->info[type].dqi_fmt_id = format_id;
+ INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
+ mutex_lock(&dqopt->dqio_mutex);
+ if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
+ mutex_unlock(&dqopt->dqio_mutex);
+ goto out_file_init;
+ }
+ mutex_unlock(&dqopt->dqio_mutex);
+ mutex_unlock(&inode->i_mutex);
+ spin_lock(&dq_state_lock);
+ dqopt->flags |= dquot_state_flag(flags, type);
+ spin_unlock(&dq_state_lock);
+
+ add_dquot_ref(sb, type);
+ mutex_unlock(&dqopt->dqonoff_mutex);
+
+ return 0;
+
+out_file_init:
+ dqopt->files[type] = NULL;
+ iput(inode);
+out_lock:
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ if (oldflags != -1) {
+ down_write(&dqopt->dqptr_sem);
+ /* Set the flags back (in the case of accidental quotaon()
+ * on a wrong file we don't want to mess up the flags) */
+ inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
+ inode->i_flags |= oldflags;
+ up_write(&dqopt->dqptr_sem);
+ }
+ mutex_unlock(&inode->i_mutex);
+out_fmt:
+ put_quota_format(fmt);
+
+ return error;
+}
+
+/* Reenable quotas on remount RW */
+static int vfs_quota_on_remount(struct super_block *sb, int type)
+{
+ struct quota_info *dqopt = sb_dqopt(sb);
+ struct inode *inode;
+ int ret;
+ unsigned int flags;
+
+ mutex_lock(&dqopt->dqonoff_mutex);
+ if (!sb_has_quota_suspended(sb, type)) {
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ return 0;
+ }
+ inode = dqopt->files[type];
+ dqopt->files[type] = NULL;
+ spin_lock(&dq_state_lock);
+ flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
+ DQUOT_LIMITS_ENABLED, type);
+ dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
+ spin_unlock(&dq_state_lock);
+ mutex_unlock(&dqopt->dqonoff_mutex);
+
+ flags = dquot_generic_flag(flags, type);
+ ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
+ flags);
+ iput(inode);
+
+ return ret;
+}
+
+int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
+ struct path *path)
+{
+ int error = security_quota_on(path->dentry);
+ if (error)
+ return error;
+ /* Quota file not on the same filesystem? */
+ if (path->mnt->mnt_sb != sb)
+ error = -EXDEV;
+ else
+ error = vfs_load_quota_inode(path->dentry->d_inode, type,
+ format_id, DQUOT_USAGE_ENABLED |
+ DQUOT_LIMITS_ENABLED);
+ return error;
+}
+EXPORT_SYMBOL(vfs_quota_on_path);
+
+int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
+ int remount)
+{
+ struct path path;
+ int error;
+
+ if (remount)
+ return vfs_quota_on_remount(sb, type);
+
+ error = kern_path(name, LOOKUP_FOLLOW, &path);
+ if (!error) {
+ error = vfs_quota_on_path(sb, type, format_id, &path);
+ path_put(&path);
+ }
+ return error;
+}
+EXPORT_SYMBOL(vfs_quota_on);
+
+/*
+ * More powerful function for turning on quotas allowing setting
+ * of individual quota flags
+ */
+int vfs_quota_enable(struct inode *inode, int type, int format_id,
+ unsigned int flags)
+{
+ int ret = 0;
+ struct super_block *sb = inode->i_sb;
+ struct quota_info *dqopt = sb_dqopt(sb);
+
+ /* Just unsuspend quotas? */
+ if (flags & DQUOT_SUSPENDED)
+ return vfs_quota_on_remount(sb, type);
+ if (!flags)
+ return 0;
+ /* Just updating flags needed? */
+ if (sb_has_quota_loaded(sb, type)) {
+ mutex_lock(&dqopt->dqonoff_mutex);
+ /* Now do a reliable test... */
+ if (!sb_has_quota_loaded(sb, type)) {
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ goto load_quota;
+ }
+ if (flags & DQUOT_USAGE_ENABLED &&
+ sb_has_quota_usage_enabled(sb, type)) {
+ ret = -EBUSY;
+ goto out_lock;
+ }
+ if (flags & DQUOT_LIMITS_ENABLED &&
+ sb_has_quota_limits_enabled(sb, type)) {
+ ret = -EBUSY;
+ goto out_lock;
+ }
+ spin_lock(&dq_state_lock);
+ sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
+ spin_unlock(&dq_state_lock);
+out_lock:
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ return ret;
+ }
+
+load_quota:
+ return vfs_load_quota_inode(inode, type, format_id, flags);
+}
+EXPORT_SYMBOL(vfs_quota_enable);
+
+/*
+ * This function is used when filesystem needs to initialize quotas
+ * during mount time.
+ */
+int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
+ int format_id, int type)
+{
+ struct dentry *dentry;
+ int error;
+
+ dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+
+ if (!dentry->d_inode) {
+ error = -ENOENT;
+ goto out;
+ }
+
+ error = security_quota_on(dentry);
+ if (!error)
+ error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
+ DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+
+out:
+ dput(dentry);
+ return error;
+}
+EXPORT_SYMBOL(vfs_quota_on_mount);
+
+/* Wrapper to turn on quotas when remounting rw */
+int vfs_dq_quota_on_remount(struct super_block *sb)
+{
+ int cnt;
+ int ret = 0, err;
+
+ if (!sb->s_qcop || !sb->s_qcop->quota_on)
+ return -ENOSYS;
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
+ if (err < 0 && !ret)
+ ret = err;
+ }
+ return ret;
+}
+EXPORT_SYMBOL(vfs_dq_quota_on_remount);
+
+static inline qsize_t qbtos(qsize_t blocks)
+{
+ return blocks << QIF_DQBLKSIZE_BITS;
+}
+
+static inline qsize_t stoqb(qsize_t space)
+{
+ return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
+}
+
+/* Generic routine for getting common part of quota structure */
+static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
+{
+ struct mem_dqblk *dm = &dquot->dq_dqb;
+
+ spin_lock(&dq_data_lock);
+ di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
+ di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
+ di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
+ di->dqb_ihardlimit = dm->dqb_ihardlimit;
+ di->dqb_isoftlimit = dm->dqb_isoftlimit;
+ di->dqb_curinodes = dm->dqb_curinodes;
+ di->dqb_btime = dm->dqb_btime;
+ di->dqb_itime = dm->dqb_itime;
+ di->dqb_valid = QIF_ALL;
+ spin_unlock(&dq_data_lock);
+}
+
+int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
+{
+ struct dquot *dquot;
+
+ dquot = dqget(sb, id, type);
+ if (dquot == NODQUOT)
+ return -ESRCH;
+ do_get_dqblk(dquot, di);
+ dqput(dquot);
+
+ return 0;
+}
+EXPORT_SYMBOL(vfs_get_dqblk);
+
+/* Generic routine for setting common part of quota structure */
+static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
+{
+ struct mem_dqblk *dm = &dquot->dq_dqb;
+ int check_blim = 0, check_ilim = 0;
+ struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
+
+ if ((di->dqb_valid & QIF_BLIMITS &&
+ (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
+ di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
+ (di->dqb_valid & QIF_ILIMITS &&
+ (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
+ di->dqb_isoftlimit > dqi->dqi_maxilimit)))
+ return -ERANGE;
+
+ spin_lock(&dq_data_lock);
+ if (di->dqb_valid & QIF_SPACE) {
+ dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
+ check_blim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_BLIMITS) {
+ dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
+ dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
+ check_blim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_INODES) {
+ dm->dqb_curinodes = di->dqb_curinodes;
+ check_ilim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_ILIMITS) {
+ dm->dqb_isoftlimit = di->dqb_isoftlimit;
+ dm->dqb_ihardlimit = di->dqb_ihardlimit;
+ check_ilim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_BTIME) {
+ dm->dqb_btime = di->dqb_btime;
+ check_blim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_ITIME) {
+ dm->dqb_itime = di->dqb_itime;
+ check_ilim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
+ }
+
+ if (check_blim) {
+ if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) {
+ dm->dqb_btime = 0;
+ clear_bit(DQ_BLKS_B, &dquot->dq_flags);
+ }
+ else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
+ dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
+ }
+ if (check_ilim) {
+ if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
+ dm->dqb_itime = 0;
+ clear_bit(DQ_INODES_B, &dquot->dq_flags);
+ }
+ else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
+ dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
+ }
+ if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
+ clear_bit(DQ_FAKE_B, &dquot->dq_flags);
+ else
+ set_bit(DQ_FAKE_B, &dquot->dq_flags);
+ spin_unlock(&dq_data_lock);
+ mark_dquot_dirty(dquot);
+
+ return 0;
+}
+
+int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
+{
+ struct dquot *dquot;
+ int rc;
+
+ dquot = dqget(sb, id, type);
+ if (!dquot) {
+ rc = -ESRCH;
+ goto out;
+ }
+ rc = do_set_dqblk(dquot, di);
+ dqput(dquot);
+out:
+ return rc;
+}
+EXPORT_SYMBOL(vfs_set_dqblk);
+
+/* Generic routine for getting common part of quota file information */
+int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
+{
+ struct mem_dqinfo *mi;
+
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ if (!sb_has_quota_active(sb, type)) {
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return -ESRCH;
+ }
+ mi = sb_dqopt(sb)->info + type;
+ spin_lock(&dq_data_lock);
+ ii->dqi_bgrace = mi->dqi_bgrace;
+ ii->dqi_igrace = mi->dqi_igrace;
+ ii->dqi_flags = mi->dqi_flags & DQF_MASK;
+ ii->dqi_valid = IIF_ALL;
+ spin_unlock(&dq_data_lock);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(vfs_get_dqinfo);
+
+/* Generic routine for setting common part of quota file information */
+int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
+{
+ struct mem_dqinfo *mi;
+ int err = 0;
+
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ if (!sb_has_quota_active(sb, type)) {
+ err = -ESRCH;
+ goto out;
+ }
+ mi = sb_dqopt(sb)->info + type;
+ spin_lock(&dq_data_lock);
+ if (ii->dqi_valid & IIF_BGRACE)
+ mi->dqi_bgrace = ii->dqi_bgrace;
+ if (ii->dqi_valid & IIF_IGRACE)
+ mi->dqi_igrace = ii->dqi_igrace;
+ if (ii->dqi_valid & IIF_FLAGS)
+ mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
+ spin_unlock(&dq_data_lock);
+ mark_info_dirty(sb, type);
+ /* Force write to disk */
+ sb->dq_op->write_info(sb, type);
+out:
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return err;
+}
+EXPORT_SYMBOL(vfs_set_dqinfo);
+
+struct quotactl_ops vfs_quotactl_ops = {
+ .quota_on = vfs_quota_on,
+ .quota_off = vfs_quota_off,
+ .quota_sync = vfs_quota_sync,
+ .get_info = vfs_get_dqinfo,
+ .set_info = vfs_set_dqinfo,
+ .get_dqblk = vfs_get_dqblk,
+ .set_dqblk = vfs_set_dqblk
+};
+
+static ctl_table fs_dqstats_table[] = {
+ {
+ .ctl_name = FS_DQ_LOOKUPS,
+ .procname = "lookups",
+ .data = &dqstats.lookups,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_DROPS,
+ .procname = "drops",
+ .data = &dqstats.drops,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_READS,
+ .procname = "reads",
+ .data = &dqstats.reads,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_WRITES,
+ .procname = "writes",
+ .data = &dqstats.writes,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_CACHE_HITS,
+ .procname = "cache_hits",
+ .data = &dqstats.cache_hits,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_ALLOCATED,
+ .procname = "allocated_dquots",
+ .data = &dqstats.allocated_dquots,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_FREE,
+ .procname = "free_dquots",
+ .data = &dqstats.free_dquots,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = FS_DQ_SYNCS,
+ .procname = "syncs",
+ .data = &dqstats.syncs,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+#ifdef CONFIG_PRINT_QUOTA_WARNING
+ {
+ .ctl_name = FS_DQ_WARNINGS,
+ .procname = "warnings",
+ .data = &flag_print_warnings,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
+ { .ctl_name = 0 },
+};
+
+static ctl_table fs_table[] = {
+ {
+ .ctl_name = FS_DQSTATS,
+ .procname = "quota",
+ .mode = 0555,
+ .child = fs_dqstats_table,
+ },
+ { .ctl_name = 0 },
+};
+
+static ctl_table sys_table[] = {
+ {
+ .ctl_name = CTL_FS,
+ .procname = "fs",
+ .mode = 0555,
+ .child = fs_table,
+ },
+ { .ctl_name = 0 },
+};
+
+static int __init dquot_init(void)
+{
+ int i;
+ unsigned long nr_hash, order;
+
+ printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
+
+ register_sysctl_table(sys_table);
+
+ dquot_cachep = kmem_cache_create("dquot",
+ sizeof(struct dquot), sizeof(unsigned long) * 4,
+ (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_PANIC),
+ NULL);
+
+ order = 0;
+ dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
+ if (!dquot_hash)
+ panic("Cannot create dquot hash table");
+
+ /* Find power-of-two hlist_heads which can fit into allocation */
+ nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
+ dq_hash_bits = 0;
+ do {
+ dq_hash_bits++;
+ } while (nr_hash >> dq_hash_bits);
+ dq_hash_bits--;
+
+ nr_hash = 1UL << dq_hash_bits;
+ dq_hash_mask = nr_hash - 1;
+ for (i = 0; i < nr_hash; i++)
+ INIT_HLIST_HEAD(dquot_hash + i);
+
+ printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
+ nr_hash, order, (PAGE_SIZE << order));
+
+ register_shrinker(&dqcache_shrinker);
+
+#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
+ if (genl_register_family("a_genl_family) != 0)
+ printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
+#endif
+
+ return 0;
+}
+module_init(dquot_init);
--- /dev/null
+/*
+ * Quota code necessary even when VFS quota support is not compiled
+ * into the kernel. The interesting stuff is over in dquot.c, here
+ * we have symbols for initial quotactl(2) handling, the sysctl(2)
+ * variables, etc - things needed even when quota support disabled.
+ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/slab.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+#include <linux/compat.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/buffer_head.h>
+#include <linux/capability.h>
+#include <linux/quotaops.h>
+#include <linux/types.h>
+
+/* Check validity of generic quotactl commands */
+static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
+{
+ if (type >= MAXQUOTAS)
+ return -EINVAL;
+ if (!sb && cmd != Q_SYNC)
+ return -ENODEV;
+ /* Is operation supported? */
+ if (sb && !sb->s_qcop)
+ return -ENOSYS;
+
+ switch (cmd) {
+ case Q_GETFMT:
+ break;
+ case Q_QUOTAON:
+ if (!sb->s_qcop->quota_on)
+ return -ENOSYS;
+ break;
+ case Q_QUOTAOFF:
+ if (!sb->s_qcop->quota_off)
+ return -ENOSYS;
+ break;
+ case Q_SETINFO:
+ if (!sb->s_qcop->set_info)
+ return -ENOSYS;
+ break;
+ case Q_GETINFO:
+ if (!sb->s_qcop->get_info)
+ return -ENOSYS;
+ break;
+ case Q_SETQUOTA:
+ if (!sb->s_qcop->set_dqblk)
+ return -ENOSYS;
+ break;
+ case Q_GETQUOTA:
+ if (!sb->s_qcop->get_dqblk)
+ return -ENOSYS;
+ break;
+ case Q_SYNC:
+ if (sb && !sb->s_qcop->quota_sync)
+ return -ENOSYS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Is quota turned on for commands which need it? */
+ switch (cmd) {
+ case Q_GETFMT:
+ case Q_GETINFO:
+ case Q_SETINFO:
+ case Q_SETQUOTA:
+ case Q_GETQUOTA:
+ /* This is just informative test so we are satisfied without a lock */
+ if (!sb_has_quota_active(sb, type))
+ return -ESRCH;
+ }
+
+ /* Check privileges */
+ if (cmd == Q_GETQUOTA) {
+ if (((type == USRQUOTA && current_euid() != id) ||
+ (type == GRPQUOTA && !in_egroup_p(id))) &&
+ !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ }
+ else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO)
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ return 0;
+}
+
+/* Check validity of XFS Quota Manager commands */
+static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
+{
+ if (type >= XQM_MAXQUOTAS)
+ return -EINVAL;
+ if (!sb)
+ return -ENODEV;
+ if (!sb->s_qcop)
+ return -ENOSYS;
+
+ switch (cmd) {
+ case Q_XQUOTAON:
+ case Q_XQUOTAOFF:
+ case Q_XQUOTARM:
+ if (!sb->s_qcop->set_xstate)
+ return -ENOSYS;
+ break;
+ case Q_XGETQSTAT:
+ if (!sb->s_qcop->get_xstate)
+ return -ENOSYS;
+ break;
+ case Q_XSETQLIM:
+ if (!sb->s_qcop->set_xquota)
+ return -ENOSYS;
+ break;
+ case Q_XGETQUOTA:
+ if (!sb->s_qcop->get_xquota)
+ return -ENOSYS;
+ break;
+ case Q_XQUOTASYNC:
+ if (!sb->s_qcop->quota_sync)
+ return -ENOSYS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Check privileges */
+ if (cmd == Q_XGETQUOTA) {
+ if (((type == XQM_USRQUOTA && current_euid() != id) ||
+ (type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
+ !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+static int check_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
+{
+ int error;
+
+ if (XQM_COMMAND(cmd))
+ error = xqm_quotactl_valid(sb, type, cmd, id);
+ else
+ error = generic_quotactl_valid(sb, type, cmd, id);
+ if (!error)
+ error = security_quotactl(cmd, type, id, sb);
+ return error;
+}
+
+static void quota_sync_sb(struct super_block *sb, int type)
+{
+ int cnt;
+
+ sb->s_qcop->quota_sync(sb, type);
+
+ if (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)
+ return;
+ /* This is not very clever (and fast) but currently I don't know about
+ * any other simple way of getting quota data to disk and we must get
+ * them there for userspace to be visible... */
+ if (sb->s_op->sync_fs)
+ sb->s_op->sync_fs(sb, 1);
+ sync_blockdev(sb->s_bdev);
+
+ /*
+ * Now when everything is written we can discard the pagecache so
+ * that userspace sees the changes.
+ */
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, I_MUTEX_QUOTA);
+ truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
+ mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
+ }
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+}
+
+void sync_dquots(struct super_block *sb, int type)
+{
+ int cnt;
+
+ if (sb) {
+ if (sb->s_qcop->quota_sync)
+ quota_sync_sb(sb, type);
+ return;
+ }
+
+ spin_lock(&sb_lock);
+restart:
+ list_for_each_entry(sb, &super_blocks, s_list) {
+ /* This test just improves performance so it needn't be reliable... */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && type != cnt)
+ continue;
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ if (!info_dirty(&sb_dqopt(sb)->info[cnt]) &&
+ list_empty(&sb_dqopt(sb)->info[cnt].dqi_dirty_list))
+ continue;
+ break;
+ }
+ if (cnt == MAXQUOTAS)
+ continue;
+ sb->s_count++;
+ spin_unlock(&sb_lock);
+ down_read(&sb->s_umount);
+ if (sb->s_root && sb->s_qcop->quota_sync)
+ quota_sync_sb(sb, type);
+ up_read(&sb->s_umount);
+ spin_lock(&sb_lock);
+ if (__put_super_and_need_restart(sb))
+ goto restart;
+ }
+ spin_unlock(&sb_lock);
+}
+
+/* Copy parameters and call proper function */
+static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void __user *addr)
+{
+ int ret;
+
+ switch (cmd) {
+ case Q_QUOTAON: {
+ char *pathname;
+
+ if (IS_ERR(pathname = getname(addr)))
+ return PTR_ERR(pathname);
+ ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
+ putname(pathname);
+ return ret;
+ }
+ case Q_QUOTAOFF:
+ return sb->s_qcop->quota_off(sb, type, 0);
+
+ case Q_GETFMT: {
+ __u32 fmt;
+
+ down_read(&sb_dqopt(sb)->dqptr_sem);
+ if (!sb_has_quota_active(sb, type)) {
+ up_read(&sb_dqopt(sb)->dqptr_sem);
+ return -ESRCH;
+ }
+ fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
+ up_read(&sb_dqopt(sb)->dqptr_sem);
+ if (copy_to_user(addr, &fmt, sizeof(fmt)))
+ return -EFAULT;
+ return 0;
+ }
+ case Q_GETINFO: {
+ struct if_dqinfo info;
+
+ if ((ret = sb->s_qcop->get_info(sb, type, &info)))
+ return ret;
+ if (copy_to_user(addr, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+ }
+ case Q_SETINFO: {
+ struct if_dqinfo info;
+
+ if (copy_from_user(&info, addr, sizeof(info)))
+ return -EFAULT;
+ return sb->s_qcop->set_info(sb, type, &info);
+ }
+ case Q_GETQUOTA: {
+ struct if_dqblk idq;
+
+ if ((ret = sb->s_qcop->get_dqblk(sb, type, id, &idq)))
+ return ret;
+ if (copy_to_user(addr, &idq, sizeof(idq)))
+ return -EFAULT;
+ return 0;
+ }
+ case Q_SETQUOTA: {
+ struct if_dqblk idq;
+
+ if (copy_from_user(&idq, addr, sizeof(idq)))
+ return -EFAULT;
+ return sb->s_qcop->set_dqblk(sb, type, id, &idq);
+ }
+ case Q_SYNC:
+ sync_dquots(sb, type);
+ return 0;
+
+ case Q_XQUOTAON:
+ case Q_XQUOTAOFF:
+ case Q_XQUOTARM: {
+ __u32 flags;
+
+ if (copy_from_user(&flags, addr, sizeof(flags)))
+ return -EFAULT;
+ return sb->s_qcop->set_xstate(sb, flags, cmd);
+ }
+ case Q_XGETQSTAT: {
+ struct fs_quota_stat fqs;
+
+ if ((ret = sb->s_qcop->get_xstate(sb, &fqs)))
+ return ret;
+ if (copy_to_user(addr, &fqs, sizeof(fqs)))
+ return -EFAULT;
+ return 0;
+ }
+ case Q_XSETQLIM: {
+ struct fs_disk_quota fdq;
+
+ if (copy_from_user(&fdq, addr, sizeof(fdq)))
+ return -EFAULT;
+ return sb->s_qcop->set_xquota(sb, type, id, &fdq);
+ }
+ case Q_XGETQUOTA: {
+ struct fs_disk_quota fdq;
+
+ if ((ret = sb->s_qcop->get_xquota(sb, type, id, &fdq)))
+ return ret;
+ if (copy_to_user(addr, &fdq, sizeof(fdq)))
+ return -EFAULT;
+ return 0;
+ }
+ case Q_XQUOTASYNC:
+ return sb->s_qcop->quota_sync(sb, type);
+ /* We never reach here unless validity check is broken */
+ default:
+ BUG();
+ }
+ return 0;
+}
+
+/*
+ * look up a superblock on which quota ops will be performed
+ * - use the name of a block device to find the superblock thereon
+ */
+static inline struct super_block *quotactl_block(const char __user *special)
+{
+#ifdef CONFIG_BLOCK
+ struct block_device *bdev;
+ struct super_block *sb;
+ char *tmp = getname(special);
+
+ if (IS_ERR(tmp))
+ return ERR_CAST(tmp);
+ bdev = lookup_bdev(tmp);
+ putname(tmp);
+ if (IS_ERR(bdev))
+ return ERR_CAST(bdev);
+ sb = get_super(bdev);
+ bdput(bdev);
+ if (!sb)
+ return ERR_PTR(-ENODEV);
+
+ return sb;
+#else
+ return ERR_PTR(-ENODEV);
+#endif
+}
+
+/*
+ * This is the system call interface. This communicates with
+ * the user-level programs. Currently this only supports diskquota
+ * calls. Maybe we need to add the process quotas etc. in the future,
+ * but we probably should use rlimits for that.
+ */
+SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
+ qid_t, id, void __user *, addr)
+{
+ uint cmds, type;
+ struct super_block *sb = NULL;
+ int ret;
+
+ cmds = cmd >> SUBCMDSHIFT;
+ type = cmd & SUBCMDMASK;
+
+ if (cmds != Q_SYNC || special) {
+ sb = quotactl_block(special);
+ if (IS_ERR(sb))
+ return PTR_ERR(sb);
+ }
+
+ ret = check_quotactl_valid(sb, type, cmds, id);
+ if (ret >= 0)
+ ret = do_quotactl(sb, type, cmds, id, addr);
+ if (sb)
+ drop_super(sb);
+
+ return ret;
+}
+
+#if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT)
+/*
+ * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
+ * and is necessary due to alignment problems.
+ */
+struct compat_if_dqblk {
+ compat_u64 dqb_bhardlimit;
+ compat_u64 dqb_bsoftlimit;
+ compat_u64 dqb_curspace;
+ compat_u64 dqb_ihardlimit;
+ compat_u64 dqb_isoftlimit;
+ compat_u64 dqb_curinodes;
+ compat_u64 dqb_btime;
+ compat_u64 dqb_itime;
+ compat_uint_t dqb_valid;
+};
+
+/* XFS structures */
+struct compat_fs_qfilestat {
+ compat_u64 dqb_bhardlimit;
+ compat_u64 qfs_nblks;
+ compat_uint_t qfs_nextents;
+};
+
+struct compat_fs_quota_stat {
+ __s8 qs_version;
+ __u16 qs_flags;
+ __s8 qs_pad;
+ struct compat_fs_qfilestat qs_uquota;
+ struct compat_fs_qfilestat qs_gquota;
+ compat_uint_t qs_incoredqs;
+ compat_int_t qs_btimelimit;
+ compat_int_t qs_itimelimit;
+ compat_int_t qs_rtbtimelimit;
+ __u16 qs_bwarnlimit;
+ __u16 qs_iwarnlimit;
+};
+
+asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
+ qid_t id, void __user *addr)
+{
+ unsigned int cmds;
+ struct if_dqblk __user *dqblk;
+ struct compat_if_dqblk __user *compat_dqblk;
+ struct fs_quota_stat __user *fsqstat;
+ struct compat_fs_quota_stat __user *compat_fsqstat;
+ compat_uint_t data;
+ u16 xdata;
+ long ret;
+
+ cmds = cmd >> SUBCMDSHIFT;
+
+ switch (cmds) {
+ case Q_GETQUOTA:
+ dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
+ compat_dqblk = addr;
+ ret = sys_quotactl(cmd, special, id, dqblk);
+ if (ret)
+ break;
+ if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
+ get_user(data, &dqblk->dqb_valid) ||
+ put_user(data, &compat_dqblk->dqb_valid))
+ ret = -EFAULT;
+ break;
+ case Q_SETQUOTA:
+ dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
+ compat_dqblk = addr;
+ ret = -EFAULT;
+ if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
+ get_user(data, &compat_dqblk->dqb_valid) ||
+ put_user(data, &dqblk->dqb_valid))
+ break;
+ ret = sys_quotactl(cmd, special, id, dqblk);
+ break;
+ case Q_XGETQSTAT:
+ fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
+ compat_fsqstat = addr;
+ ret = sys_quotactl(cmd, special, id, fsqstat);
+ if (ret)
+ break;
+ ret = -EFAULT;
+ /* Copying qs_version, qs_flags, qs_pad */
+ if (copy_in_user(compat_fsqstat, fsqstat,
+ offsetof(struct compat_fs_quota_stat, qs_uquota)))
+ break;
+ /* Copying qs_uquota */
+ if (copy_in_user(&compat_fsqstat->qs_uquota,
+ &fsqstat->qs_uquota,
+ sizeof(compat_fsqstat->qs_uquota)) ||
+ get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
+ put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
+ break;
+ /* Copying qs_gquota */
+ if (copy_in_user(&compat_fsqstat->qs_gquota,
+ &fsqstat->qs_gquota,
+ sizeof(compat_fsqstat->qs_gquota)) ||
+ get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
+ put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
+ break;
+ /* Copying the rest */
+ if (copy_in_user(&compat_fsqstat->qs_incoredqs,
+ &fsqstat->qs_incoredqs,
+ sizeof(struct compat_fs_quota_stat) -
+ offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
+ get_user(xdata, &fsqstat->qs_iwarnlimit) ||
+ put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
+ break;
+ ret = 0;
+ break;
+ default:
+ ret = sys_quotactl(cmd, special, id, addr);
+ }
+ return ret;
+}
+#endif
--- /dev/null
+/*
+ * vfsv0 quota IO operations on file
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/dqblk_v2.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/quotaops.h>
+
+#include <asm/byteorder.h>
+
+#include "quota_tree.h"
+
+MODULE_AUTHOR("Jan Kara");
+MODULE_DESCRIPTION("Quota trie support");
+MODULE_LICENSE("GPL");
+
+#define __QUOTA_QT_PARANOIA
+
+typedef char *dqbuf_t;
+
+static int get_index(struct qtree_mem_dqinfo *info, qid_t id, int depth)
+{
+ unsigned int epb = info->dqi_usable_bs >> 2;
+
+ depth = info->dqi_qtree_depth - depth - 1;
+ while (depth--)
+ id /= epb;
+ return id % epb;
+}
+
+/* Number of entries in one blocks */
+static inline int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info)
+{
+ return (info->dqi_usable_bs - sizeof(struct qt_disk_dqdbheader))
+ / info->dqi_entry_size;
+}
+
+static dqbuf_t getdqbuf(size_t size)
+{
+ dqbuf_t buf = kmalloc(size, GFP_NOFS);
+ if (!buf)
+ printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n");
+ return buf;
+}
+
+static inline void freedqbuf(dqbuf_t buf)
+{
+ kfree(buf);
+}
+
+static inline ssize_t read_blk(struct qtree_mem_dqinfo *info, uint blk, dqbuf_t buf)
+{
+ struct super_block *sb = info->dqi_sb;
+
+ memset(buf, 0, info->dqi_usable_bs);
+ return sb->s_op->quota_read(sb, info->dqi_type, (char *)buf,
+ info->dqi_usable_bs, blk << info->dqi_blocksize_bits);
+}
+
+static inline ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, dqbuf_t buf)
+{
+ struct super_block *sb = info->dqi_sb;
+
+ return sb->s_op->quota_write(sb, info->dqi_type, (char *)buf,
+ info->dqi_usable_bs, blk << info->dqi_blocksize_bits);
+}
+
+/* Remove empty block from list and return it */
+static int get_free_dqblk(struct qtree_mem_dqinfo *info)
+{
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
+ int ret, blk;
+
+ if (!buf)
+ return -ENOMEM;
+ if (info->dqi_free_blk) {
+ blk = info->dqi_free_blk;
+ ret = read_blk(info, blk, buf);
+ if (ret < 0)
+ goto out_buf;
+ info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
+ }
+ else {
+ memset(buf, 0, info->dqi_usable_bs);
+ /* Assure block allocation... */
+ ret = write_blk(info, info->dqi_blocks, buf);
+ if (ret < 0)
+ goto out_buf;
+ blk = info->dqi_blocks++;
+ }
+ mark_info_dirty(info->dqi_sb, info->dqi_type);
+ ret = blk;
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Insert empty block to the list */
+static int put_free_dqblk(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
+ int err;
+
+ dh->dqdh_next_free = cpu_to_le32(info->dqi_free_blk);
+ dh->dqdh_prev_free = cpu_to_le32(0);
+ dh->dqdh_entries = cpu_to_le16(0);
+ err = write_blk(info, blk, buf);
+ if (err < 0)
+ return err;
+ info->dqi_free_blk = blk;
+ mark_info_dirty(info->dqi_sb, info->dqi_type);
+ return 0;
+}
+
+/* Remove given block from the list of blocks with free entries */
+static int remove_free_dqentry(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ dqbuf_t tmpbuf = getdqbuf(info->dqi_usable_bs);
+ struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
+ uint nextblk = le32_to_cpu(dh->dqdh_next_free);
+ uint prevblk = le32_to_cpu(dh->dqdh_prev_free);
+ int err;
+
+ if (!tmpbuf)
+ return -ENOMEM;
+ if (nextblk) {
+ err = read_blk(info, nextblk, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free =
+ dh->dqdh_prev_free;
+ err = write_blk(info, nextblk, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ }
+ if (prevblk) {
+ err = read_blk(info, prevblk, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_next_free =
+ dh->dqdh_next_free;
+ err = write_blk(info, prevblk, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ } else {
+ info->dqi_free_entry = nextblk;
+ mark_info_dirty(info->dqi_sb, info->dqi_type);
+ }
+ freedqbuf(tmpbuf);
+ dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0);
+ /* No matter whether write succeeds block is out of list */
+ if (write_blk(info, blk, buf) < 0)
+ printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk);
+ return 0;
+out_buf:
+ freedqbuf(tmpbuf);
+ return err;
+}
+
+/* Insert given block to the beginning of list with free entries */
+static int insert_free_dqentry(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ dqbuf_t tmpbuf = getdqbuf(info->dqi_usable_bs);
+ struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
+ int err;
+
+ if (!tmpbuf)
+ return -ENOMEM;
+ dh->dqdh_next_free = cpu_to_le32(info->dqi_free_entry);
+ dh->dqdh_prev_free = cpu_to_le32(0);
+ err = write_blk(info, blk, buf);
+ if (err < 0)
+ goto out_buf;
+ if (info->dqi_free_entry) {
+ err = read_blk(info, info->dqi_free_entry, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free =
+ cpu_to_le32(blk);
+ err = write_blk(info, info->dqi_free_entry, tmpbuf);
+ if (err < 0)
+ goto out_buf;
+ }
+ freedqbuf(tmpbuf);
+ info->dqi_free_entry = blk;
+ mark_info_dirty(info->dqi_sb, info->dqi_type);
+ return 0;
+out_buf:
+ freedqbuf(tmpbuf);
+ return err;
+}
+
+/* Is the entry in the block free? */
+int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk)
+{
+ int i;
+
+ for (i = 0; i < info->dqi_entry_size; i++)
+ if (disk[i])
+ return 0;
+ return 1;
+}
+EXPORT_SYMBOL(qtree_entry_unused);
+
+/* Find space for dquot */
+static uint find_free_dqentry(struct qtree_mem_dqinfo *info,
+ struct dquot *dquot, int *err)
+{
+ uint blk, i;
+ struct qt_disk_dqdbheader *dh;
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ char *ddquot;
+
+ *err = 0;
+ if (!buf) {
+ *err = -ENOMEM;
+ return 0;
+ }
+ dh = (struct qt_disk_dqdbheader *)buf;
+ if (info->dqi_free_entry) {
+ blk = info->dqi_free_entry;
+ *err = read_blk(info, blk, buf);
+ if (*err < 0)
+ goto out_buf;
+ } else {
+ blk = get_free_dqblk(info);
+ if ((int)blk < 0) {
+ *err = blk;
+ freedqbuf(buf);
+ return 0;
+ }
+ memset(buf, 0, info->dqi_usable_bs);
+ /* This is enough as block is already zeroed and entry list is empty... */
+ info->dqi_free_entry = blk;
+ mark_info_dirty(dquot->dq_sb, dquot->dq_type);
+ }
+ /* Block will be full? */
+ if (le16_to_cpu(dh->dqdh_entries) + 1 >= qtree_dqstr_in_blk(info)) {
+ *err = remove_free_dqentry(info, buf, blk);
+ if (*err < 0) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Can't "
+ "remove block (%u) from entry free list.\n",
+ blk);
+ goto out_buf;
+ }
+ }
+ le16_add_cpu(&dh->dqdh_entries, 1);
+ /* Find free structure in block */
+ for (i = 0, ddquot = ((char *)buf) + sizeof(struct qt_disk_dqdbheader);
+ i < qtree_dqstr_in_blk(info) && !qtree_entry_unused(info, ddquot);
+ i++, ddquot += info->dqi_entry_size);
+#ifdef __QUOTA_QT_PARANOIA
+ if (i == qtree_dqstr_in_blk(info)) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Data block full "
+ "but it shouldn't.\n");
+ *err = -EIO;
+ goto out_buf;
+ }
+#endif
+ *err = write_blk(info, blk, buf);
+ if (*err < 0) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota "
+ "data block %u.\n", blk);
+ goto out_buf;
+ }
+ dquot->dq_off = (blk << info->dqi_blocksize_bits) +
+ sizeof(struct qt_disk_dqdbheader) +
+ i * info->dqi_entry_size;
+ freedqbuf(buf);
+ return blk;
+out_buf:
+ freedqbuf(buf);
+ return 0;
+}
+
+/* Insert reference to structure into the trie */
+static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
+ uint *treeblk, int depth)
+{
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ int ret = 0, newson = 0, newact = 0;
+ __le32 *ref;
+ uint newblk;
+
+ if (!buf)
+ return -ENOMEM;
+ if (!*treeblk) {
+ ret = get_free_dqblk(info);
+ if (ret < 0)
+ goto out_buf;
+ *treeblk = ret;
+ memset(buf, 0, info->dqi_usable_bs);
+ newact = 1;
+ } else {
+ ret = read_blk(info, *treeblk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't read tree quota block "
+ "%u.\n", *treeblk);
+ goto out_buf;
+ }
+ }
+ ref = (__le32 *)buf;
+ newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
+ if (!newblk)
+ newson = 1;
+ if (depth == info->dqi_qtree_depth - 1) {
+#ifdef __QUOTA_QT_PARANOIA
+ if (newblk) {
+ printk(KERN_ERR "VFS: Inserting already present quota "
+ "entry (block %u).\n",
+ le32_to_cpu(ref[get_index(info,
+ dquot->dq_id, depth)]));
+ ret = -EIO;
+ goto out_buf;
+ }
+#endif
+ newblk = find_free_dqentry(info, dquot, &ret);
+ } else {
+ ret = do_insert_tree(info, dquot, &newblk, depth+1);
+ }
+ if (newson && ret >= 0) {
+ ref[get_index(info, dquot->dq_id, depth)] =
+ cpu_to_le32(newblk);
+ ret = write_blk(info, *treeblk, buf);
+ } else if (newact && ret < 0) {
+ put_free_dqblk(info, buf, *treeblk);
+ }
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Wrapper for inserting quota structure into tree */
+static inline int dq_insert_tree(struct qtree_mem_dqinfo *info,
+ struct dquot *dquot)
+{
+ int tmp = QT_TREEOFF;
+ return do_insert_tree(info, dquot, &tmp, 0);
+}
+
+/*
+ * We don't have to be afraid of deadlocks as we never have quotas on quota files...
+ */
+int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
+{
+ int type = dquot->dq_type;
+ struct super_block *sb = dquot->dq_sb;
+ ssize_t ret;
+ dqbuf_t ddquot = getdqbuf(info->dqi_entry_size);
+
+ if (!ddquot)
+ return -ENOMEM;
+
+ /* dq_off is guarded by dqio_mutex */
+ if (!dquot->dq_off) {
+ ret = dq_insert_tree(info, dquot);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Error %zd occurred while "
+ "creating quota.\n", ret);
+ freedqbuf(ddquot);
+ return ret;
+ }
+ }
+ spin_lock(&dq_data_lock);
+ info->dqi_ops->mem2disk_dqblk(ddquot, dquot);
+ spin_unlock(&dq_data_lock);
+ ret = sb->s_op->quota_write(sb, type, (char *)ddquot,
+ info->dqi_entry_size, dquot->dq_off);
+ if (ret != info->dqi_entry_size) {
+ printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
+ sb->s_id);
+ if (ret >= 0)
+ ret = -ENOSPC;
+ } else {
+ ret = 0;
+ }
+ dqstats.writes++;
+ freedqbuf(ddquot);
+
+ return ret;
+}
+EXPORT_SYMBOL(qtree_write_dquot);
+
+/* Free dquot entry in data block */
+static int free_dqentry(struct qtree_mem_dqinfo *info, struct dquot *dquot,
+ uint blk)
+{
+ struct qt_disk_dqdbheader *dh;
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ int ret = 0;
+
+ if (!buf)
+ return -ENOMEM;
+ if (dquot->dq_off >> info->dqi_blocksize_bits != blk) {
+ printk(KERN_ERR "VFS: Quota structure has offset to other "
+ "block (%u) than it should (%u).\n", blk,
+ (uint)(dquot->dq_off >> info->dqi_blocksize_bits));
+ goto out_buf;
+ }
+ ret = read_blk(info, blk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't read quota data block %u\n", blk);
+ goto out_buf;
+ }
+ dh = (struct qt_disk_dqdbheader *)buf;
+ le16_add_cpu(&dh->dqdh_entries, -1);
+ if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */
+ ret = remove_free_dqentry(info, buf, blk);
+ if (ret >= 0)
+ ret = put_free_dqblk(info, buf, blk);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't move quota data block (%u) "
+ "to free list.\n", blk);
+ goto out_buf;
+ }
+ } else {
+ memset(buf +
+ (dquot->dq_off & ((1 << info->dqi_blocksize_bits) - 1)),
+ 0, info->dqi_entry_size);
+ if (le16_to_cpu(dh->dqdh_entries) ==
+ qtree_dqstr_in_blk(info) - 1) {
+ /* Insert will write block itself */
+ ret = insert_free_dqentry(info, buf, blk);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't insert quota data "
+ "block (%u) to free entry list.\n", blk);
+ goto out_buf;
+ }
+ } else {
+ ret = write_blk(info, blk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't write quota data "
+ "block %u\n", blk);
+ goto out_buf;
+ }
+ }
+ }
+ dquot->dq_off = 0; /* Quota is now unattached */
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Remove reference to dquot from tree */
+static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
+ uint *blk, int depth)
+{
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ int ret = 0;
+ uint newblk;
+ __le32 *ref = (__le32 *)buf;
+
+ if (!buf)
+ return -ENOMEM;
+ ret = read_blk(info, *blk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't read quota data block %u\n", *blk);
+ goto out_buf;
+ }
+ newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
+ if (depth == info->dqi_qtree_depth - 1) {
+ ret = free_dqentry(info, dquot, newblk);
+ newblk = 0;
+ } else {
+ ret = remove_tree(info, dquot, &newblk, depth+1);
+ }
+ if (ret >= 0 && !newblk) {
+ int i;
+ ref[get_index(info, dquot->dq_id, depth)] = cpu_to_le32(0);
+ /* Block got empty? */
+ for (i = 0;
+ i < (info->dqi_usable_bs >> 2) && !ref[i];
+ i++);
+ /* Don't put the root block into the free block list */
+ if (i == (info->dqi_usable_bs >> 2)
+ && *blk != QT_TREEOFF) {
+ put_free_dqblk(info, buf, *blk);
+ *blk = 0;
+ } else {
+ ret = write_blk(info, *blk, buf);
+ if (ret < 0)
+ printk(KERN_ERR "VFS: Can't write quota tree "
+ "block %u.\n", *blk);
+ }
+ }
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Delete dquot from tree */
+int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
+{
+ uint tmp = QT_TREEOFF;
+
+ if (!dquot->dq_off) /* Even not allocated? */
+ return 0;
+ return remove_tree(info, dquot, &tmp, 0);
+}
+EXPORT_SYMBOL(qtree_delete_dquot);
+
+/* Find entry in block */
+static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info,
+ struct dquot *dquot, uint blk)
+{
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ loff_t ret = 0;
+ int i;
+ char *ddquot;
+
+ if (!buf)
+ return -ENOMEM;
+ ret = read_blk(info, blk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
+ goto out_buf;
+ }
+ for (i = 0, ddquot = ((char *)buf) + sizeof(struct qt_disk_dqdbheader);
+ i < qtree_dqstr_in_blk(info) && !info->dqi_ops->is_id(ddquot, dquot);
+ i++, ddquot += info->dqi_entry_size);
+ if (i == qtree_dqstr_in_blk(info)) {
+ printk(KERN_ERR "VFS: Quota for id %u referenced "
+ "but not present.\n", dquot->dq_id);
+ ret = -EIO;
+ goto out_buf;
+ } else {
+ ret = (blk << info->dqi_blocksize_bits) + sizeof(struct
+ qt_disk_dqdbheader) + i * info->dqi_entry_size;
+ }
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Find entry for given id in the tree */
+static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
+ struct dquot *dquot, uint blk, int depth)
+{
+ dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
+ loff_t ret = 0;
+ __le32 *ref = (__le32 *)buf;
+
+ if (!buf)
+ return -ENOMEM;
+ ret = read_blk(info, blk, buf);
+ if (ret < 0) {
+ printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
+ goto out_buf;
+ }
+ ret = 0;
+ blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
+ if (!blk) /* No reference? */
+ goto out_buf;
+ if (depth < info->dqi_qtree_depth - 1)
+ ret = find_tree_dqentry(info, dquot, blk, depth+1);
+ else
+ ret = find_block_dqentry(info, dquot, blk);
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Find entry for given id in the tree - wrapper function */
+static inline loff_t find_dqentry(struct qtree_mem_dqinfo *info,
+ struct dquot *dquot)
+{
+ return find_tree_dqentry(info, dquot, QT_TREEOFF, 0);
+}
+
+int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
+{
+ int type = dquot->dq_type;
+ struct super_block *sb = dquot->dq_sb;
+ loff_t offset;
+ dqbuf_t ddquot;
+ int ret = 0;
+
+#ifdef __QUOTA_QT_PARANOIA
+ /* Invalidated quota? */
+ if (!sb_dqopt(dquot->dq_sb)->files[type]) {
+ printk(KERN_ERR "VFS: Quota invalidated while reading!\n");
+ return -EIO;
+ }
+#endif
+ /* Do we know offset of the dquot entry in the quota file? */
+ if (!dquot->dq_off) {
+ offset = find_dqentry(info, dquot);
+ if (offset <= 0) { /* Entry not present? */
+ if (offset < 0)
+ printk(KERN_ERR "VFS: Can't read quota "
+ "structure for id %u.\n", dquot->dq_id);
+ dquot->dq_off = 0;
+ set_bit(DQ_FAKE_B, &dquot->dq_flags);
+ memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
+ ret = offset;
+ goto out;
+ }
+ dquot->dq_off = offset;
+ }
+ ddquot = getdqbuf(info->dqi_entry_size);
+ if (!ddquot)
+ return -ENOMEM;
+ ret = sb->s_op->quota_read(sb, type, (char *)ddquot,
+ info->dqi_entry_size, dquot->dq_off);
+ if (ret != info->dqi_entry_size) {
+ if (ret >= 0)
+ ret = -EIO;
+ printk(KERN_ERR "VFS: Error while reading quota "
+ "structure for id %u.\n", dquot->dq_id);
+ set_bit(DQ_FAKE_B, &dquot->dq_flags);
+ memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
+ freedqbuf(ddquot);
+ goto out;
+ }
+ spin_lock(&dq_data_lock);
+ info->dqi_ops->disk2mem_dqblk(dquot, ddquot);
+ if (!dquot->dq_dqb.dqb_bhardlimit &&
+ !dquot->dq_dqb.dqb_bsoftlimit &&
+ !dquot->dq_dqb.dqb_ihardlimit &&
+ !dquot->dq_dqb.dqb_isoftlimit)
+ set_bit(DQ_FAKE_B, &dquot->dq_flags);
+ spin_unlock(&dq_data_lock);
+ freedqbuf(ddquot);
+out:
+ dqstats.reads++;
+ return ret;
+}
+EXPORT_SYMBOL(qtree_read_dquot);
+
+/* Check whether dquot should not be deleted. We know we are
+ * the only one operating on dquot (thanks to dq_lock) */
+int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
+{
+ if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace))
+ return qtree_delete_dquot(info, dquot);
+ return 0;
+}
+EXPORT_SYMBOL(qtree_release_dquot);
--- /dev/null
+/*
+ * Definitions of structures for vfsv0 quota format
+ */
+
+#ifndef _LINUX_QUOTA_TREE_H
+#define _LINUX_QUOTA_TREE_H
+
+#include <linux/types.h>
+#include <linux/quota.h>
+
+/*
+ * Structure of header of block with quota structures. It is padded to 16 bytes so
+ * there will be space for exactly 21 quota-entries in a block
+ */
+struct qt_disk_dqdbheader {
+ __le32 dqdh_next_free; /* Number of next block with free entry */
+ __le32 dqdh_prev_free; /* Number of previous block with free entry */
+ __le16 dqdh_entries; /* Number of valid entries in block */
+ __le16 dqdh_pad1;
+ __le32 dqdh_pad2;
+};
+
+#define QT_TREEOFF 1 /* Offset of tree in file in blocks */
+
+#endif /* _LINUX_QUOTAIO_TREE_H */
--- /dev/null
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/quota.h>
+#include <linux/quotaops.h>
+#include <linux/dqblk_v1.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/byteorder.h>
+
+#include "quotaio_v1.h"
+
+MODULE_AUTHOR("Jan Kara");
+MODULE_DESCRIPTION("Old quota format support");
+MODULE_LICENSE("GPL");
+
+#define QUOTABLOCK_BITS 10
+#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
+
+static inline qsize_t v1_stoqb(qsize_t space)
+{
+ return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
+}
+
+static inline qsize_t v1_qbtos(qsize_t blocks)
+{
+ return blocks << QUOTABLOCK_BITS;
+}
+
+static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
+{
+ m->dqb_ihardlimit = d->dqb_ihardlimit;
+ m->dqb_isoftlimit = d->dqb_isoftlimit;
+ m->dqb_curinodes = d->dqb_curinodes;
+ m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
+ m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
+ m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
+ m->dqb_itime = d->dqb_itime;
+ m->dqb_btime = d->dqb_btime;
+}
+
+static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
+{
+ d->dqb_ihardlimit = m->dqb_ihardlimit;
+ d->dqb_isoftlimit = m->dqb_isoftlimit;
+ d->dqb_curinodes = m->dqb_curinodes;
+ d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
+ d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
+ d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
+ d->dqb_itime = m->dqb_itime;
+ d->dqb_btime = m->dqb_btime;
+}
+
+static int v1_read_dqblk(struct dquot *dquot)
+{
+ int type = dquot->dq_type;
+ struct v1_disk_dqblk dqblk;
+
+ if (!sb_dqopt(dquot->dq_sb)->files[type])
+ return -EINVAL;
+
+ /* Set structure to 0s in case read fails/is after end of file */
+ memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
+ dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
+
+ v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
+ if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
+ dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
+ set_bit(DQ_FAKE_B, &dquot->dq_flags);
+ dqstats.reads++;
+
+ return 0;
+}
+
+static int v1_commit_dqblk(struct dquot *dquot)
+{
+ short type = dquot->dq_type;
+ ssize_t ret;
+ struct v1_disk_dqblk dqblk;
+
+ v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
+ if (dquot->dq_id == 0) {
+ dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
+ dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
+ }
+ ret = 0;
+ if (sb_dqopt(dquot->dq_sb)->files[type])
+ ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
+ sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
+ if (ret != sizeof(struct v1_disk_dqblk)) {
+ printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
+ dquot->dq_sb->s_id);
+ if (ret >= 0)
+ ret = -EIO;
+ goto out;
+ }
+ ret = 0;
+
+out:
+ dqstats.writes++;
+
+ return ret;
+}
+
+/* Magics of new quota format */
+#define V2_INITQMAGICS {\
+ 0xd9c01f11, /* USRQUOTA */\
+ 0xd9c01927 /* GRPQUOTA */\
+}
+
+/* Header of new quota format */
+struct v2_disk_dqheader {
+ __le32 dqh_magic; /* Magic number identifying file */
+ __le32 dqh_version; /* File version */
+};
+
+static int v1_check_quota_file(struct super_block *sb, int type)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ ulong blocks;
+ size_t off;
+ struct v2_disk_dqheader dqhead;
+ ssize_t size;
+ loff_t isize;
+ static const uint quota_magics[] = V2_INITQMAGICS;
+
+ isize = i_size_read(inode);
+ if (!isize)
+ return 0;
+ blocks = isize >> BLOCK_SIZE_BITS;
+ off = isize & (BLOCK_SIZE - 1);
+ if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
+ return 0;
+ /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
+ size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
+ if (size != sizeof(struct v2_disk_dqheader))
+ return 1; /* Probably not new format */
+ if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
+ return 1; /* Definitely not new format */
+ printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);
+ return 0; /* Seems like a new format file -> refuse it */
+}
+
+static int v1_read_file_info(struct super_block *sb, int type)
+{
+ struct quota_info *dqopt = sb_dqopt(sb);
+ struct v1_disk_dqblk dqblk;
+ int ret;
+
+ if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto out;
+ }
+ ret = 0;
+ /* limits are stored as unsigned 32-bit data */
+ dqopt->info[type].dqi_maxblimit = 0xffffffff;
+ dqopt->info[type].dqi_maxilimit = 0xffffffff;
+ dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
+ dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
+out:
+ return ret;
+}
+
+static int v1_write_file_info(struct super_block *sb, int type)
+{
+ struct quota_info *dqopt = sb_dqopt(sb);
+ struct v1_disk_dqblk dqblk;
+ int ret;
+
+ dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
+ if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
+ sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto out;
+ }
+ dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
+ dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
+ ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
+ sizeof(struct v1_disk_dqblk), v1_dqoff(0));
+ if (ret == sizeof(struct v1_disk_dqblk))
+ ret = 0;
+ else if (ret > 0)
+ ret = -EIO;
+out:
+ return ret;
+}
+
+static struct quota_format_ops v1_format_ops = {
+ .check_quota_file = v1_check_quota_file,
+ .read_file_info = v1_read_file_info,
+ .write_file_info = v1_write_file_info,
+ .free_file_info = NULL,
+ .read_dqblk = v1_read_dqblk,
+ .commit_dqblk = v1_commit_dqblk,
+};
+
+static struct quota_format_type v1_quota_format = {
+ .qf_fmt_id = QFMT_VFS_OLD,
+ .qf_ops = &v1_format_ops,
+ .qf_owner = THIS_MODULE
+};
+
+static int __init init_v1_quota_format(void)
+{
+ return register_quota_format(&v1_quota_format);
+}
+
+static void __exit exit_v1_quota_format(void)
+{
+ unregister_quota_format(&v1_quota_format);
+}
+
+module_init(init_v1_quota_format);
+module_exit(exit_v1_quota_format);
+
--- /dev/null
+/*
+ * vfsv0 quota IO operations on file
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/dqblk_v2.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/quotaops.h>
+
+#include <asm/byteorder.h>
+
+#include "quota_tree.h"
+#include "quotaio_v2.h"
+
+MODULE_AUTHOR("Jan Kara");
+MODULE_DESCRIPTION("Quota format v2 support");
+MODULE_LICENSE("GPL");
+
+#define __QUOTA_V2_PARANOIA
+
+static void v2_mem2diskdqb(void *dp, struct dquot *dquot);
+static void v2_disk2memdqb(struct dquot *dquot, void *dp);
+static int v2_is_id(void *dp, struct dquot *dquot);
+
+static struct qtree_fmt_operations v2_qtree_ops = {
+ .mem2disk_dqblk = v2_mem2diskdqb,
+ .disk2mem_dqblk = v2_disk2memdqb,
+ .is_id = v2_is_id,
+};
+
+#define QUOTABLOCK_BITS 10
+#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
+
+static inline qsize_t v2_stoqb(qsize_t space)
+{
+ return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
+}
+
+static inline qsize_t v2_qbtos(qsize_t blocks)
+{
+ return blocks << QUOTABLOCK_BITS;
+}
+
+/* Check whether given file is really vfsv0 quotafile */
+static int v2_check_quota_file(struct super_block *sb, int type)
+{
+ struct v2_disk_dqheader dqhead;
+ ssize_t size;
+ static const uint quota_magics[] = V2_INITQMAGICS;
+ static const uint quota_versions[] = V2_INITQVERSIONS;
+
+ size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
+ if (size != sizeof(struct v2_disk_dqheader)) {
+ printk("quota_v2: failed read expected=%zd got=%zd\n",
+ sizeof(struct v2_disk_dqheader), size);
+ return 0;
+ }
+ if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
+ le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
+ return 0;
+ return 1;
+}
+
+/* Read information header from quota file */
+static int v2_read_file_info(struct super_block *sb, int type)
+{
+ struct v2_disk_dqinfo dinfo;
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct qtree_mem_dqinfo *qinfo;
+ ssize_t size;
+
+ size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
+ sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
+ if (size != sizeof(struct v2_disk_dqinfo)) {
+ printk(KERN_WARNING "Can't read info structure on device %s.\n",
+ sb->s_id);
+ return -1;
+ }
+ info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
+ if (!info->dqi_priv) {
+ printk(KERN_WARNING
+ "Not enough memory for quota information structure.\n");
+ return -1;
+ }
+ qinfo = info->dqi_priv;
+ /* limits are stored as unsigned 32-bit data */
+ info->dqi_maxblimit = 0xffffffff;
+ info->dqi_maxilimit = 0xffffffff;
+ info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
+ info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
+ info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
+ qinfo->dqi_sb = sb;
+ qinfo->dqi_type = type;
+ qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
+ qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
+ qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
+ qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
+ qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
+ qinfo->dqi_qtree_depth = qtree_depth(qinfo);
+ qinfo->dqi_entry_size = sizeof(struct v2_disk_dqblk);
+ qinfo->dqi_ops = &v2_qtree_ops;
+ return 0;
+}
+
+/* Write information header to quota file */
+static int v2_write_file_info(struct super_block *sb, int type)
+{
+ struct v2_disk_dqinfo dinfo;
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
+ ssize_t size;
+
+ spin_lock(&dq_data_lock);
+ info->dqi_flags &= ~DQF_INFO_DIRTY;
+ dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
+ dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
+ dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
+ spin_unlock(&dq_data_lock);
+ dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
+ dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
+ dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
+ size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
+ sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
+ if (size != sizeof(struct v2_disk_dqinfo)) {
+ printk(KERN_WARNING "Can't write info structure on device %s.\n",
+ sb->s_id);
+ return -1;
+ }
+ return 0;
+}
+
+static void v2_disk2memdqb(struct dquot *dquot, void *dp)
+{
+ struct v2_disk_dqblk *d = dp, empty;
+ struct mem_dqblk *m = &dquot->dq_dqb;
+
+ m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
+ m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
+ m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
+ m->dqb_itime = le64_to_cpu(d->dqb_itime);
+ m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
+ m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
+ m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
+ m->dqb_btime = le64_to_cpu(d->dqb_btime);
+ /* We need to escape back all-zero structure */
+ memset(&empty, 0, sizeof(struct v2_disk_dqblk));
+ empty.dqb_itime = cpu_to_le64(1);
+ if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk)))
+ m->dqb_itime = 0;
+}
+
+static void v2_mem2diskdqb(void *dp, struct dquot *dquot)
+{
+ struct v2_disk_dqblk *d = dp;
+ struct mem_dqblk *m = &dquot->dq_dqb;
+ struct qtree_mem_dqinfo *info =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+ d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
+ d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
+ d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
+ d->dqb_itime = cpu_to_le64(m->dqb_itime);
+ d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
+ d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
+ d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
+ d->dqb_btime = cpu_to_le64(m->dqb_btime);
+ d->dqb_id = cpu_to_le32(dquot->dq_id);
+ if (qtree_entry_unused(info, dp))
+ d->dqb_itime = cpu_to_le64(1);
+}
+
+static int v2_is_id(void *dp, struct dquot *dquot)
+{
+ struct v2_disk_dqblk *d = dp;
+ struct qtree_mem_dqinfo *info =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+ if (qtree_entry_unused(info, dp))
+ return 0;
+ return le32_to_cpu(d->dqb_id) == dquot->dq_id;
+}
+
+static int v2_read_dquot(struct dquot *dquot)
+{
+ return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
+}
+
+static int v2_write_dquot(struct dquot *dquot)
+{
+ return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
+}
+
+static int v2_release_dquot(struct dquot *dquot)
+{
+ return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
+}
+
+static int v2_free_file_info(struct super_block *sb, int type)
+{
+ kfree(sb_dqinfo(sb, type)->dqi_priv);
+ return 0;
+}
+
+static struct quota_format_ops v2_format_ops = {
+ .check_quota_file = v2_check_quota_file,
+ .read_file_info = v2_read_file_info,
+ .write_file_info = v2_write_file_info,
+ .free_file_info = v2_free_file_info,
+ .read_dqblk = v2_read_dquot,
+ .commit_dqblk = v2_write_dquot,
+ .release_dqblk = v2_release_dquot,
+};
+
+static struct quota_format_type v2_quota_format = {
+ .qf_fmt_id = QFMT_VFS_V0,
+ .qf_ops = &v2_format_ops,
+ .qf_owner = THIS_MODULE
+};
+
+static int __init init_v2_quota_format(void)
+{
+ return register_quota_format(&v2_quota_format);
+}
+
+static void __exit exit_v2_quota_format(void)
+{
+ unregister_quota_format(&v2_quota_format);
+}
+
+module_init(init_v2_quota_format);
+module_exit(exit_v2_quota_format);
--- /dev/null
+#ifndef _LINUX_QUOTAIO_V1_H
+#define _LINUX_QUOTAIO_V1_H
+
+#include <linux/types.h>
+
+/*
+ * The following constants define the amount of time given a user
+ * before the soft limits are treated as hard limits (usually resulting
+ * in an allocation failure). The timer is started when the user crosses
+ * their soft limit, it is reset when they go below their soft limit.
+ */
+#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */
+#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */
+
+/*
+ * The following structure defines the format of the disk quota file
+ * (as it appears on disk) - the file is an array of these structures
+ * indexed by user or group number.
+ */
+struct v1_disk_dqblk {
+ __u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
+ __u32 dqb_bsoftlimit; /* preferred limit on disk blks */
+ __u32 dqb_curblocks; /* current block count */
+ __u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
+ __u32 dqb_isoftlimit; /* preferred inode limit */
+ __u32 dqb_curinodes; /* current # allocated inodes */
+ time_t dqb_btime; /* time limit for excessive disk use */
+ time_t dqb_itime; /* time limit for excessive inode use */
+};
+
+#define v1_dqoff(UID) ((loff_t)((UID) * sizeof (struct v1_disk_dqblk)))
+
+#endif /* _LINUX_QUOTAIO_V1_H */
--- /dev/null
+/*
+ * Definitions of structures for vfsv0 quota format
+ */
+
+#ifndef _LINUX_QUOTAIO_V2_H
+#define _LINUX_QUOTAIO_V2_H
+
+#include <linux/types.h>
+#include <linux/quota.h>
+
+/*
+ * Definitions of magics and versions of current quota files
+ */
+#define V2_INITQMAGICS {\
+ 0xd9c01f11, /* USRQUOTA */\
+ 0xd9c01927 /* GRPQUOTA */\
+}
+
+#define V2_INITQVERSIONS {\
+ 0, /* USRQUOTA */\
+ 0 /* GRPQUOTA */\
+}
+
+/* First generic header */
+struct v2_disk_dqheader {
+ __le32 dqh_magic; /* Magic number identifying file */
+ __le32 dqh_version; /* File version */
+};
+
+/*
+ * The following structure defines the format of the disk quota file
+ * (as it appears on disk) - the file is a radix tree whose leaves point
+ * to blocks of these structures.
+ */
+struct v2_disk_dqblk {
+ __le32 dqb_id; /* id this quota applies to */
+ __le32 dqb_ihardlimit; /* absolute limit on allocated inodes */
+ __le32 dqb_isoftlimit; /* preferred inode limit */
+ __le32 dqb_curinodes; /* current # allocated inodes */
+ __le32 dqb_bhardlimit; /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
+ __le32 dqb_bsoftlimit; /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
+ __le64 dqb_curspace; /* current space occupied (in bytes) */
+ __le64 dqb_btime; /* time limit for excessive disk use */
+ __le64 dqb_itime; /* time limit for excessive inode use */
+};
+
+/* Header with type and version specific information */
+struct v2_disk_dqinfo {
+ __le32 dqi_bgrace; /* Time before block soft limit becomes hard limit */
+ __le32 dqi_igrace; /* Time before inode soft limit becomes hard limit */
+ __le32 dqi_flags; /* Flags for quotafile (DQF_*) */
+ __le32 dqi_blocks; /* Number of blocks in file */
+ __le32 dqi_free_blk; /* Number of first free block in the list */
+ __le32 dqi_free_entry; /* Number of block with at least one free entry */
+};
+
+#define V2_DQINFOOFF sizeof(struct v2_disk_dqheader) /* Offset of info header in file */
+#define V2_DQBLKSIZE_BITS 10 /* Size of leaf block in tree */
+
+#endif /* _LINUX_QUOTAIO_V2_H */
+++ /dev/null
-/*
- * vfsv0 quota IO operations on file
- */
-
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/dqblk_v2.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/quotaops.h>
-
-#include <asm/byteorder.h>
-
-#include "quota_tree.h"
-
-MODULE_AUTHOR("Jan Kara");
-MODULE_DESCRIPTION("Quota trie support");
-MODULE_LICENSE("GPL");
-
-#define __QUOTA_QT_PARANOIA
-
-typedef char *dqbuf_t;
-
-static int get_index(struct qtree_mem_dqinfo *info, qid_t id, int depth)
-{
- unsigned int epb = info->dqi_usable_bs >> 2;
-
- depth = info->dqi_qtree_depth - depth - 1;
- while (depth--)
- id /= epb;
- return id % epb;
-}
-
-/* Number of entries in one blocks */
-static inline int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info)
-{
- return (info->dqi_usable_bs - sizeof(struct qt_disk_dqdbheader))
- / info->dqi_entry_size;
-}
-
-static dqbuf_t getdqbuf(size_t size)
-{
- dqbuf_t buf = kmalloc(size, GFP_NOFS);
- if (!buf)
- printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n");
- return buf;
-}
-
-static inline void freedqbuf(dqbuf_t buf)
-{
- kfree(buf);
-}
-
-static inline ssize_t read_blk(struct qtree_mem_dqinfo *info, uint blk, dqbuf_t buf)
-{
- struct super_block *sb = info->dqi_sb;
-
- memset(buf, 0, info->dqi_usable_bs);
- return sb->s_op->quota_read(sb, info->dqi_type, (char *)buf,
- info->dqi_usable_bs, blk << info->dqi_blocksize_bits);
-}
-
-static inline ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, dqbuf_t buf)
-{
- struct super_block *sb = info->dqi_sb;
-
- return sb->s_op->quota_write(sb, info->dqi_type, (char *)buf,
- info->dqi_usable_bs, blk << info->dqi_blocksize_bits);
-}
-
-/* Remove empty block from list and return it */
-static int get_free_dqblk(struct qtree_mem_dqinfo *info)
-{
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
- int ret, blk;
-
- if (!buf)
- return -ENOMEM;
- if (info->dqi_free_blk) {
- blk = info->dqi_free_blk;
- ret = read_blk(info, blk, buf);
- if (ret < 0)
- goto out_buf;
- info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
- }
- else {
- memset(buf, 0, info->dqi_usable_bs);
- /* Assure block allocation... */
- ret = write_blk(info, info->dqi_blocks, buf);
- if (ret < 0)
- goto out_buf;
- blk = info->dqi_blocks++;
- }
- mark_info_dirty(info->dqi_sb, info->dqi_type);
- ret = blk;
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Insert empty block to the list */
-static int put_free_dqblk(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
-{
- struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
- int err;
-
- dh->dqdh_next_free = cpu_to_le32(info->dqi_free_blk);
- dh->dqdh_prev_free = cpu_to_le32(0);
- dh->dqdh_entries = cpu_to_le16(0);
- err = write_blk(info, blk, buf);
- if (err < 0)
- return err;
- info->dqi_free_blk = blk;
- mark_info_dirty(info->dqi_sb, info->dqi_type);
- return 0;
-}
-
-/* Remove given block from the list of blocks with free entries */
-static int remove_free_dqentry(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
-{
- dqbuf_t tmpbuf = getdqbuf(info->dqi_usable_bs);
- struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
- uint nextblk = le32_to_cpu(dh->dqdh_next_free);
- uint prevblk = le32_to_cpu(dh->dqdh_prev_free);
- int err;
-
- if (!tmpbuf)
- return -ENOMEM;
- if (nextblk) {
- err = read_blk(info, nextblk, tmpbuf);
- if (err < 0)
- goto out_buf;
- ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free =
- dh->dqdh_prev_free;
- err = write_blk(info, nextblk, tmpbuf);
- if (err < 0)
- goto out_buf;
- }
- if (prevblk) {
- err = read_blk(info, prevblk, tmpbuf);
- if (err < 0)
- goto out_buf;
- ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_next_free =
- dh->dqdh_next_free;
- err = write_blk(info, prevblk, tmpbuf);
- if (err < 0)
- goto out_buf;
- } else {
- info->dqi_free_entry = nextblk;
- mark_info_dirty(info->dqi_sb, info->dqi_type);
- }
- freedqbuf(tmpbuf);
- dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0);
- /* No matter whether write succeeds block is out of list */
- if (write_blk(info, blk, buf) < 0)
- printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk);
- return 0;
-out_buf:
- freedqbuf(tmpbuf);
- return err;
-}
-
-/* Insert given block to the beginning of list with free entries */
-static int insert_free_dqentry(struct qtree_mem_dqinfo *info, dqbuf_t buf, uint blk)
-{
- dqbuf_t tmpbuf = getdqbuf(info->dqi_usable_bs);
- struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf;
- int err;
-
- if (!tmpbuf)
- return -ENOMEM;
- dh->dqdh_next_free = cpu_to_le32(info->dqi_free_entry);
- dh->dqdh_prev_free = cpu_to_le32(0);
- err = write_blk(info, blk, buf);
- if (err < 0)
- goto out_buf;
- if (info->dqi_free_entry) {
- err = read_blk(info, info->dqi_free_entry, tmpbuf);
- if (err < 0)
- goto out_buf;
- ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free =
- cpu_to_le32(blk);
- err = write_blk(info, info->dqi_free_entry, tmpbuf);
- if (err < 0)
- goto out_buf;
- }
- freedqbuf(tmpbuf);
- info->dqi_free_entry = blk;
- mark_info_dirty(info->dqi_sb, info->dqi_type);
- return 0;
-out_buf:
- freedqbuf(tmpbuf);
- return err;
-}
-
-/* Is the entry in the block free? */
-int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk)
-{
- int i;
-
- for (i = 0; i < info->dqi_entry_size; i++)
- if (disk[i])
- return 0;
- return 1;
-}
-EXPORT_SYMBOL(qtree_entry_unused);
-
-/* Find space for dquot */
-static uint find_free_dqentry(struct qtree_mem_dqinfo *info,
- struct dquot *dquot, int *err)
-{
- uint blk, i;
- struct qt_disk_dqdbheader *dh;
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- char *ddquot;
-
- *err = 0;
- if (!buf) {
- *err = -ENOMEM;
- return 0;
- }
- dh = (struct qt_disk_dqdbheader *)buf;
- if (info->dqi_free_entry) {
- blk = info->dqi_free_entry;
- *err = read_blk(info, blk, buf);
- if (*err < 0)
- goto out_buf;
- } else {
- blk = get_free_dqblk(info);
- if ((int)blk < 0) {
- *err = blk;
- freedqbuf(buf);
- return 0;
- }
- memset(buf, 0, info->dqi_usable_bs);
- /* This is enough as block is already zeroed and entry list is empty... */
- info->dqi_free_entry = blk;
- mark_info_dirty(dquot->dq_sb, dquot->dq_type);
- }
- /* Block will be full? */
- if (le16_to_cpu(dh->dqdh_entries) + 1 >= qtree_dqstr_in_blk(info)) {
- *err = remove_free_dqentry(info, buf, blk);
- if (*err < 0) {
- printk(KERN_ERR "VFS: find_free_dqentry(): Can't "
- "remove block (%u) from entry free list.\n",
- blk);
- goto out_buf;
- }
- }
- le16_add_cpu(&dh->dqdh_entries, 1);
- /* Find free structure in block */
- for (i = 0, ddquot = ((char *)buf) + sizeof(struct qt_disk_dqdbheader);
- i < qtree_dqstr_in_blk(info) && !qtree_entry_unused(info, ddquot);
- i++, ddquot += info->dqi_entry_size);
-#ifdef __QUOTA_QT_PARANOIA
- if (i == qtree_dqstr_in_blk(info)) {
- printk(KERN_ERR "VFS: find_free_dqentry(): Data block full "
- "but it shouldn't.\n");
- *err = -EIO;
- goto out_buf;
- }
-#endif
- *err = write_blk(info, blk, buf);
- if (*err < 0) {
- printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota "
- "data block %u.\n", blk);
- goto out_buf;
- }
- dquot->dq_off = (blk << info->dqi_blocksize_bits) +
- sizeof(struct qt_disk_dqdbheader) +
- i * info->dqi_entry_size;
- freedqbuf(buf);
- return blk;
-out_buf:
- freedqbuf(buf);
- return 0;
-}
-
-/* Insert reference to structure into the trie */
-static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
- uint *treeblk, int depth)
-{
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- int ret = 0, newson = 0, newact = 0;
- __le32 *ref;
- uint newblk;
-
- if (!buf)
- return -ENOMEM;
- if (!*treeblk) {
- ret = get_free_dqblk(info);
- if (ret < 0)
- goto out_buf;
- *treeblk = ret;
- memset(buf, 0, info->dqi_usable_bs);
- newact = 1;
- } else {
- ret = read_blk(info, *treeblk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read tree quota block "
- "%u.\n", *treeblk);
- goto out_buf;
- }
- }
- ref = (__le32 *)buf;
- newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
- if (!newblk)
- newson = 1;
- if (depth == info->dqi_qtree_depth - 1) {
-#ifdef __QUOTA_QT_PARANOIA
- if (newblk) {
- printk(KERN_ERR "VFS: Inserting already present quota "
- "entry (block %u).\n",
- le32_to_cpu(ref[get_index(info,
- dquot->dq_id, depth)]));
- ret = -EIO;
- goto out_buf;
- }
-#endif
- newblk = find_free_dqentry(info, dquot, &ret);
- } else {
- ret = do_insert_tree(info, dquot, &newblk, depth+1);
- }
- if (newson && ret >= 0) {
- ref[get_index(info, dquot->dq_id, depth)] =
- cpu_to_le32(newblk);
- ret = write_blk(info, *treeblk, buf);
- } else if (newact && ret < 0) {
- put_free_dqblk(info, buf, *treeblk);
- }
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Wrapper for inserting quota structure into tree */
-static inline int dq_insert_tree(struct qtree_mem_dqinfo *info,
- struct dquot *dquot)
-{
- int tmp = QT_TREEOFF;
- return do_insert_tree(info, dquot, &tmp, 0);
-}
-
-/*
- * We don't have to be afraid of deadlocks as we never have quotas on quota files...
- */
-int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
-{
- int type = dquot->dq_type;
- struct super_block *sb = dquot->dq_sb;
- ssize_t ret;
- dqbuf_t ddquot = getdqbuf(info->dqi_entry_size);
-
- if (!ddquot)
- return -ENOMEM;
-
- /* dq_off is guarded by dqio_mutex */
- if (!dquot->dq_off) {
- ret = dq_insert_tree(info, dquot);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Error %zd occurred while "
- "creating quota.\n", ret);
- freedqbuf(ddquot);
- return ret;
- }
- }
- spin_lock(&dq_data_lock);
- info->dqi_ops->mem2disk_dqblk(ddquot, dquot);
- spin_unlock(&dq_data_lock);
- ret = sb->s_op->quota_write(sb, type, (char *)ddquot,
- info->dqi_entry_size, dquot->dq_off);
- if (ret != info->dqi_entry_size) {
- printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
- sb->s_id);
- if (ret >= 0)
- ret = -ENOSPC;
- } else {
- ret = 0;
- }
- dqstats.writes++;
- freedqbuf(ddquot);
-
- return ret;
-}
-EXPORT_SYMBOL(qtree_write_dquot);
-
-/* Free dquot entry in data block */
-static int free_dqentry(struct qtree_mem_dqinfo *info, struct dquot *dquot,
- uint blk)
-{
- struct qt_disk_dqdbheader *dh;
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- int ret = 0;
-
- if (!buf)
- return -ENOMEM;
- if (dquot->dq_off >> info->dqi_blocksize_bits != blk) {
- printk(KERN_ERR "VFS: Quota structure has offset to other "
- "block (%u) than it should (%u).\n", blk,
- (uint)(dquot->dq_off >> info->dqi_blocksize_bits));
- goto out_buf;
- }
- ret = read_blk(info, blk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota data block %u\n", blk);
- goto out_buf;
- }
- dh = (struct qt_disk_dqdbheader *)buf;
- le16_add_cpu(&dh->dqdh_entries, -1);
- if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */
- ret = remove_free_dqentry(info, buf, blk);
- if (ret >= 0)
- ret = put_free_dqblk(info, buf, blk);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't move quota data block (%u) "
- "to free list.\n", blk);
- goto out_buf;
- }
- } else {
- memset(buf +
- (dquot->dq_off & ((1 << info->dqi_blocksize_bits) - 1)),
- 0, info->dqi_entry_size);
- if (le16_to_cpu(dh->dqdh_entries) ==
- qtree_dqstr_in_blk(info) - 1) {
- /* Insert will write block itself */
- ret = insert_free_dqentry(info, buf, blk);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't insert quota data "
- "block (%u) to free entry list.\n", blk);
- goto out_buf;
- }
- } else {
- ret = write_blk(info, blk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't write quota data "
- "block %u\n", blk);
- goto out_buf;
- }
- }
- }
- dquot->dq_off = 0; /* Quota is now unattached */
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Remove reference to dquot from tree */
-static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
- uint *blk, int depth)
-{
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- int ret = 0;
- uint newblk;
- __le32 *ref = (__le32 *)buf;
-
- if (!buf)
- return -ENOMEM;
- ret = read_blk(info, *blk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota data block %u\n", *blk);
- goto out_buf;
- }
- newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
- if (depth == info->dqi_qtree_depth - 1) {
- ret = free_dqentry(info, dquot, newblk);
- newblk = 0;
- } else {
- ret = remove_tree(info, dquot, &newblk, depth+1);
- }
- if (ret >= 0 && !newblk) {
- int i;
- ref[get_index(info, dquot->dq_id, depth)] = cpu_to_le32(0);
- /* Block got empty? */
- for (i = 0;
- i < (info->dqi_usable_bs >> 2) && !ref[i];
- i++);
- /* Don't put the root block into the free block list */
- if (i == (info->dqi_usable_bs >> 2)
- && *blk != QT_TREEOFF) {
- put_free_dqblk(info, buf, *blk);
- *blk = 0;
- } else {
- ret = write_blk(info, *blk, buf);
- if (ret < 0)
- printk(KERN_ERR "VFS: Can't write quota tree "
- "block %u.\n", *blk);
- }
- }
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Delete dquot from tree */
-int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
-{
- uint tmp = QT_TREEOFF;
-
- if (!dquot->dq_off) /* Even not allocated? */
- return 0;
- return remove_tree(info, dquot, &tmp, 0);
-}
-EXPORT_SYMBOL(qtree_delete_dquot);
-
-/* Find entry in block */
-static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info,
- struct dquot *dquot, uint blk)
-{
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- loff_t ret = 0;
- int i;
- char *ddquot;
-
- if (!buf)
- return -ENOMEM;
- ret = read_blk(info, blk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
- goto out_buf;
- }
- for (i = 0, ddquot = ((char *)buf) + sizeof(struct qt_disk_dqdbheader);
- i < qtree_dqstr_in_blk(info) && !info->dqi_ops->is_id(ddquot, dquot);
- i++, ddquot += info->dqi_entry_size);
- if (i == qtree_dqstr_in_blk(info)) {
- printk(KERN_ERR "VFS: Quota for id %u referenced "
- "but not present.\n", dquot->dq_id);
- ret = -EIO;
- goto out_buf;
- } else {
- ret = (blk << info->dqi_blocksize_bits) + sizeof(struct
- qt_disk_dqdbheader) + i * info->dqi_entry_size;
- }
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Find entry for given id in the tree */
-static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
- struct dquot *dquot, uint blk, int depth)
-{
- dqbuf_t buf = getdqbuf(info->dqi_usable_bs);
- loff_t ret = 0;
- __le32 *ref = (__le32 *)buf;
-
- if (!buf)
- return -ENOMEM;
- ret = read_blk(info, blk, buf);
- if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
- goto out_buf;
- }
- ret = 0;
- blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
- if (!blk) /* No reference? */
- goto out_buf;
- if (depth < info->dqi_qtree_depth - 1)
- ret = find_tree_dqentry(info, dquot, blk, depth+1);
- else
- ret = find_block_dqentry(info, dquot, blk);
-out_buf:
- freedqbuf(buf);
- return ret;
-}
-
-/* Find entry for given id in the tree - wrapper function */
-static inline loff_t find_dqentry(struct qtree_mem_dqinfo *info,
- struct dquot *dquot)
-{
- return find_tree_dqentry(info, dquot, QT_TREEOFF, 0);
-}
-
-int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
-{
- int type = dquot->dq_type;
- struct super_block *sb = dquot->dq_sb;
- loff_t offset;
- dqbuf_t ddquot;
- int ret = 0;
-
-#ifdef __QUOTA_QT_PARANOIA
- /* Invalidated quota? */
- if (!sb_dqopt(dquot->dq_sb)->files[type]) {
- printk(KERN_ERR "VFS: Quota invalidated while reading!\n");
- return -EIO;
- }
-#endif
- /* Do we know offset of the dquot entry in the quota file? */
- if (!dquot->dq_off) {
- offset = find_dqentry(info, dquot);
- if (offset <= 0) { /* Entry not present? */
- if (offset < 0)
- printk(KERN_ERR "VFS: Can't read quota "
- "structure for id %u.\n", dquot->dq_id);
- dquot->dq_off = 0;
- set_bit(DQ_FAKE_B, &dquot->dq_flags);
- memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
- ret = offset;
- goto out;
- }
- dquot->dq_off = offset;
- }
- ddquot = getdqbuf(info->dqi_entry_size);
- if (!ddquot)
- return -ENOMEM;
- ret = sb->s_op->quota_read(sb, type, (char *)ddquot,
- info->dqi_entry_size, dquot->dq_off);
- if (ret != info->dqi_entry_size) {
- if (ret >= 0)
- ret = -EIO;
- printk(KERN_ERR "VFS: Error while reading quota "
- "structure for id %u.\n", dquot->dq_id);
- set_bit(DQ_FAKE_B, &dquot->dq_flags);
- memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
- freedqbuf(ddquot);
- goto out;
- }
- spin_lock(&dq_data_lock);
- info->dqi_ops->disk2mem_dqblk(dquot, ddquot);
- if (!dquot->dq_dqb.dqb_bhardlimit &&
- !dquot->dq_dqb.dqb_bsoftlimit &&
- !dquot->dq_dqb.dqb_ihardlimit &&
- !dquot->dq_dqb.dqb_isoftlimit)
- set_bit(DQ_FAKE_B, &dquot->dq_flags);
- spin_unlock(&dq_data_lock);
- freedqbuf(ddquot);
-out:
- dqstats.reads++;
- return ret;
-}
-EXPORT_SYMBOL(qtree_read_dquot);
-
-/* Check whether dquot should not be deleted. We know we are
- * the only one operating on dquot (thanks to dq_lock) */
-int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
-{
- if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace))
- return qtree_delete_dquot(info, dquot);
- return 0;
-}
-EXPORT_SYMBOL(qtree_release_dquot);
+++ /dev/null
-/*
- * Definitions of structures for vfsv0 quota format
- */
-
-#ifndef _LINUX_QUOTA_TREE_H
-#define _LINUX_QUOTA_TREE_H
-
-#include <linux/types.h>
-#include <linux/quota.h>
-
-/*
- * Structure of header of block with quota structures. It is padded to 16 bytes so
- * there will be space for exactly 21 quota-entries in a block
- */
-struct qt_disk_dqdbheader {
- __le32 dqdh_next_free; /* Number of next block with free entry */
- __le32 dqdh_prev_free; /* Number of previous block with free entry */
- __le16 dqdh_entries; /* Number of valid entries in block */
- __le16 dqdh_pad1;
- __le32 dqdh_pad2;
-};
-
-#define QT_TREEOFF 1 /* Offset of tree in file in blocks */
-
-#endif /* _LINUX_QUOTAIO_TREE_H */
+++ /dev/null
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/quota.h>
-#include <linux/quotaops.h>
-#include <linux/dqblk_v1.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-
-#include <asm/byteorder.h>
-
-#include "quotaio_v1.h"
-
-MODULE_AUTHOR("Jan Kara");
-MODULE_DESCRIPTION("Old quota format support");
-MODULE_LICENSE("GPL");
-
-#define QUOTABLOCK_BITS 10
-#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
-
-static inline qsize_t v1_stoqb(qsize_t space)
-{
- return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
-}
-
-static inline qsize_t v1_qbtos(qsize_t blocks)
-{
- return blocks << QUOTABLOCK_BITS;
-}
-
-static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
-{
- m->dqb_ihardlimit = d->dqb_ihardlimit;
- m->dqb_isoftlimit = d->dqb_isoftlimit;
- m->dqb_curinodes = d->dqb_curinodes;
- m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
- m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
- m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
- m->dqb_itime = d->dqb_itime;
- m->dqb_btime = d->dqb_btime;
-}
-
-static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
-{
- d->dqb_ihardlimit = m->dqb_ihardlimit;
- d->dqb_isoftlimit = m->dqb_isoftlimit;
- d->dqb_curinodes = m->dqb_curinodes;
- d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
- d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
- d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
- d->dqb_itime = m->dqb_itime;
- d->dqb_btime = m->dqb_btime;
-}
-
-static int v1_read_dqblk(struct dquot *dquot)
-{
- int type = dquot->dq_type;
- struct v1_disk_dqblk dqblk;
-
- if (!sb_dqopt(dquot->dq_sb)->files[type])
- return -EINVAL;
-
- /* Set structure to 0s in case read fails/is after end of file */
- memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
- dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
-
- v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
- if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
- dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
- set_bit(DQ_FAKE_B, &dquot->dq_flags);
- dqstats.reads++;
-
- return 0;
-}
-
-static int v1_commit_dqblk(struct dquot *dquot)
-{
- short type = dquot->dq_type;
- ssize_t ret;
- struct v1_disk_dqblk dqblk;
-
- v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
- if (dquot->dq_id == 0) {
- dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
- dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
- }
- ret = 0;
- if (sb_dqopt(dquot->dq_sb)->files[type])
- ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
- sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
- if (ret != sizeof(struct v1_disk_dqblk)) {
- printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
- dquot->dq_sb->s_id);
- if (ret >= 0)
- ret = -EIO;
- goto out;
- }
- ret = 0;
-
-out:
- dqstats.writes++;
-
- return ret;
-}
-
-/* Magics of new quota format */
-#define V2_INITQMAGICS {\
- 0xd9c01f11, /* USRQUOTA */\
- 0xd9c01927 /* GRPQUOTA */\
-}
-
-/* Header of new quota format */
-struct v2_disk_dqheader {
- __le32 dqh_magic; /* Magic number identifying file */
- __le32 dqh_version; /* File version */
-};
-
-static int v1_check_quota_file(struct super_block *sb, int type)
-{
- struct inode *inode = sb_dqopt(sb)->files[type];
- ulong blocks;
- size_t off;
- struct v2_disk_dqheader dqhead;
- ssize_t size;
- loff_t isize;
- static const uint quota_magics[] = V2_INITQMAGICS;
-
- isize = i_size_read(inode);
- if (!isize)
- return 0;
- blocks = isize >> BLOCK_SIZE_BITS;
- off = isize & (BLOCK_SIZE - 1);
- if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
- return 0;
- /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
- size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
- if (size != sizeof(struct v2_disk_dqheader))
- return 1; /* Probably not new format */
- if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
- return 1; /* Definitely not new format */
- printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);
- return 0; /* Seems like a new format file -> refuse it */
-}
-
-static int v1_read_file_info(struct super_block *sb, int type)
-{
- struct quota_info *dqopt = sb_dqopt(sb);
- struct v1_disk_dqblk dqblk;
- int ret;
-
- if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
- if (ret >= 0)
- ret = -EIO;
- goto out;
- }
- ret = 0;
- /* limits are stored as unsigned 32-bit data */
- dqopt->info[type].dqi_maxblimit = 0xffffffff;
- dqopt->info[type].dqi_maxilimit = 0xffffffff;
- dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
- dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
-out:
- return ret;
-}
-
-static int v1_write_file_info(struct super_block *sb, int type)
-{
- struct quota_info *dqopt = sb_dqopt(sb);
- struct v1_disk_dqblk dqblk;
- int ret;
-
- dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
- if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
- sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
- if (ret >= 0)
- ret = -EIO;
- goto out;
- }
- dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
- dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
- ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
- sizeof(struct v1_disk_dqblk), v1_dqoff(0));
- if (ret == sizeof(struct v1_disk_dqblk))
- ret = 0;
- else if (ret > 0)
- ret = -EIO;
-out:
- return ret;
-}
-
-static struct quota_format_ops v1_format_ops = {
- .check_quota_file = v1_check_quota_file,
- .read_file_info = v1_read_file_info,
- .write_file_info = v1_write_file_info,
- .free_file_info = NULL,
- .read_dqblk = v1_read_dqblk,
- .commit_dqblk = v1_commit_dqblk,
-};
-
-static struct quota_format_type v1_quota_format = {
- .qf_fmt_id = QFMT_VFS_OLD,
- .qf_ops = &v1_format_ops,
- .qf_owner = THIS_MODULE
-};
-
-static int __init init_v1_quota_format(void)
-{
- return register_quota_format(&v1_quota_format);
-}
-
-static void __exit exit_v1_quota_format(void)
-{
- unregister_quota_format(&v1_quota_format);
-}
-
-module_init(init_v1_quota_format);
-module_exit(exit_v1_quota_format);
-
+++ /dev/null
-/*
- * vfsv0 quota IO operations on file
- */
-
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/dqblk_v2.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/quotaops.h>
-
-#include <asm/byteorder.h>
-
-#include "quota_tree.h"
-#include "quotaio_v2.h"
-
-MODULE_AUTHOR("Jan Kara");
-MODULE_DESCRIPTION("Quota format v2 support");
-MODULE_LICENSE("GPL");
-
-#define __QUOTA_V2_PARANOIA
-
-static void v2_mem2diskdqb(void *dp, struct dquot *dquot);
-static void v2_disk2memdqb(struct dquot *dquot, void *dp);
-static int v2_is_id(void *dp, struct dquot *dquot);
-
-static struct qtree_fmt_operations v2_qtree_ops = {
- .mem2disk_dqblk = v2_mem2diskdqb,
- .disk2mem_dqblk = v2_disk2memdqb,
- .is_id = v2_is_id,
-};
-
-#define QUOTABLOCK_BITS 10
-#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
-
-static inline qsize_t v2_stoqb(qsize_t space)
-{
- return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
-}
-
-static inline qsize_t v2_qbtos(qsize_t blocks)
-{
- return blocks << QUOTABLOCK_BITS;
-}
-
-/* Check whether given file is really vfsv0 quotafile */
-static int v2_check_quota_file(struct super_block *sb, int type)
-{
- struct v2_disk_dqheader dqhead;
- ssize_t size;
- static const uint quota_magics[] = V2_INITQMAGICS;
- static const uint quota_versions[] = V2_INITQVERSIONS;
-
- size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
- if (size != sizeof(struct v2_disk_dqheader)) {
- printk("quota_v2: failed read expected=%zd got=%zd\n",
- sizeof(struct v2_disk_dqheader), size);
- return 0;
- }
- if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
- le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
- return 0;
- return 1;
-}
-
-/* Read information header from quota file */
-static int v2_read_file_info(struct super_block *sb, int type)
-{
- struct v2_disk_dqinfo dinfo;
- struct mem_dqinfo *info = sb_dqinfo(sb, type);
- struct qtree_mem_dqinfo *qinfo;
- ssize_t size;
-
- size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
- sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
- if (size != sizeof(struct v2_disk_dqinfo)) {
- printk(KERN_WARNING "Can't read info structure on device %s.\n",
- sb->s_id);
- return -1;
- }
- info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
- if (!info->dqi_priv) {
- printk(KERN_WARNING
- "Not enough memory for quota information structure.\n");
- return -1;
- }
- qinfo = info->dqi_priv;
- /* limits are stored as unsigned 32-bit data */
- info->dqi_maxblimit = 0xffffffff;
- info->dqi_maxilimit = 0xffffffff;
- info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
- info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
- info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
- qinfo->dqi_sb = sb;
- qinfo->dqi_type = type;
- qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
- qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
- qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
- qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
- qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
- qinfo->dqi_qtree_depth = qtree_depth(qinfo);
- qinfo->dqi_entry_size = sizeof(struct v2_disk_dqblk);
- qinfo->dqi_ops = &v2_qtree_ops;
- return 0;
-}
-
-/* Write information header to quota file */
-static int v2_write_file_info(struct super_block *sb, int type)
-{
- struct v2_disk_dqinfo dinfo;
- struct mem_dqinfo *info = sb_dqinfo(sb, type);
- struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
- ssize_t size;
-
- spin_lock(&dq_data_lock);
- info->dqi_flags &= ~DQF_INFO_DIRTY;
- dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
- dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
- dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
- spin_unlock(&dq_data_lock);
- dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
- dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
- dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
- size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
- sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
- if (size != sizeof(struct v2_disk_dqinfo)) {
- printk(KERN_WARNING "Can't write info structure on device %s.\n",
- sb->s_id);
- return -1;
- }
- return 0;
-}
-
-static void v2_disk2memdqb(struct dquot *dquot, void *dp)
-{
- struct v2_disk_dqblk *d = dp, empty;
- struct mem_dqblk *m = &dquot->dq_dqb;
-
- m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
- m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
- m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
- m->dqb_itime = le64_to_cpu(d->dqb_itime);
- m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
- m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
- m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
- m->dqb_btime = le64_to_cpu(d->dqb_btime);
- /* We need to escape back all-zero structure */
- memset(&empty, 0, sizeof(struct v2_disk_dqblk));
- empty.dqb_itime = cpu_to_le64(1);
- if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk)))
- m->dqb_itime = 0;
-}
-
-static void v2_mem2diskdqb(void *dp, struct dquot *dquot)
-{
- struct v2_disk_dqblk *d = dp;
- struct mem_dqblk *m = &dquot->dq_dqb;
- struct qtree_mem_dqinfo *info =
- sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
-
- d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
- d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
- d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
- d->dqb_itime = cpu_to_le64(m->dqb_itime);
- d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
- d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
- d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
- d->dqb_btime = cpu_to_le64(m->dqb_btime);
- d->dqb_id = cpu_to_le32(dquot->dq_id);
- if (qtree_entry_unused(info, dp))
- d->dqb_itime = cpu_to_le64(1);
-}
-
-static int v2_is_id(void *dp, struct dquot *dquot)
-{
- struct v2_disk_dqblk *d = dp;
- struct qtree_mem_dqinfo *info =
- sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
-
- if (qtree_entry_unused(info, dp))
- return 0;
- return le32_to_cpu(d->dqb_id) == dquot->dq_id;
-}
-
-static int v2_read_dquot(struct dquot *dquot)
-{
- return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
-}
-
-static int v2_write_dquot(struct dquot *dquot)
-{
- return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
-}
-
-static int v2_release_dquot(struct dquot *dquot)
-{
- return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
-}
-
-static int v2_free_file_info(struct super_block *sb, int type)
-{
- kfree(sb_dqinfo(sb, type)->dqi_priv);
- return 0;
-}
-
-static struct quota_format_ops v2_format_ops = {
- .check_quota_file = v2_check_quota_file,
- .read_file_info = v2_read_file_info,
- .write_file_info = v2_write_file_info,
- .free_file_info = v2_free_file_info,
- .read_dqblk = v2_read_dquot,
- .commit_dqblk = v2_write_dquot,
- .release_dqblk = v2_release_dquot,
-};
-
-static struct quota_format_type v2_quota_format = {
- .qf_fmt_id = QFMT_VFS_V0,
- .qf_ops = &v2_format_ops,
- .qf_owner = THIS_MODULE
-};
-
-static int __init init_v2_quota_format(void)
-{
- return register_quota_format(&v2_quota_format);
-}
-
-static void __exit exit_v2_quota_format(void)
-{
- unregister_quota_format(&v2_quota_format);
-}
-
-module_init(init_v2_quota_format);
-module_exit(exit_v2_quota_format);
+++ /dev/null
-#ifndef _LINUX_QUOTAIO_V1_H
-#define _LINUX_QUOTAIO_V1_H
-
-#include <linux/types.h>
-
-/*
- * The following constants define the amount of time given a user
- * before the soft limits are treated as hard limits (usually resulting
- * in an allocation failure). The timer is started when the user crosses
- * their soft limit, it is reset when they go below their soft limit.
- */
-#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */
-#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */
-
-/*
- * The following structure defines the format of the disk quota file
- * (as it appears on disk) - the file is an array of these structures
- * indexed by user or group number.
- */
-struct v1_disk_dqblk {
- __u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
- __u32 dqb_bsoftlimit; /* preferred limit on disk blks */
- __u32 dqb_curblocks; /* current block count */
- __u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
- __u32 dqb_isoftlimit; /* preferred inode limit */
- __u32 dqb_curinodes; /* current # allocated inodes */
- time_t dqb_btime; /* time limit for excessive disk use */
- time_t dqb_itime; /* time limit for excessive inode use */
-};
-
-#define v1_dqoff(UID) ((loff_t)((UID) * sizeof (struct v1_disk_dqblk)))
-
-#endif /* _LINUX_QUOTAIO_V1_H */
+++ /dev/null
-/*
- * Definitions of structures for vfsv0 quota format
- */
-
-#ifndef _LINUX_QUOTAIO_V2_H
-#define _LINUX_QUOTAIO_V2_H
-
-#include <linux/types.h>
-#include <linux/quota.h>
-
-/*
- * Definitions of magics and versions of current quota files
- */
-#define V2_INITQMAGICS {\
- 0xd9c01f11, /* USRQUOTA */\
- 0xd9c01927 /* GRPQUOTA */\
-}
-
-#define V2_INITQVERSIONS {\
- 0, /* USRQUOTA */\
- 0 /* GRPQUOTA */\
-}
-
-/* First generic header */
-struct v2_disk_dqheader {
- __le32 dqh_magic; /* Magic number identifying file */
- __le32 dqh_version; /* File version */
-};
-
-/*
- * The following structure defines the format of the disk quota file
- * (as it appears on disk) - the file is a radix tree whose leaves point
- * to blocks of these structures.
- */
-struct v2_disk_dqblk {
- __le32 dqb_id; /* id this quota applies to */
- __le32 dqb_ihardlimit; /* absolute limit on allocated inodes */
- __le32 dqb_isoftlimit; /* preferred inode limit */
- __le32 dqb_curinodes; /* current # allocated inodes */
- __le32 dqb_bhardlimit; /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
- __le32 dqb_bsoftlimit; /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
- __le64 dqb_curspace; /* current space occupied (in bytes) */
- __le64 dqb_btime; /* time limit for excessive disk use */
- __le64 dqb_itime; /* time limit for excessive inode use */
-};
-
-/* Header with type and version specific information */
-struct v2_disk_dqinfo {
- __le32 dqi_bgrace; /* Time before block soft limit becomes hard limit */
- __le32 dqi_igrace; /* Time before inode soft limit becomes hard limit */
- __le32 dqi_flags; /* Flags for quotafile (DQF_*) */
- __le32 dqi_blocks; /* Number of blocks in file */
- __le32 dqi_free_blk; /* Number of first free block in the list */
- __le32 dqi_free_entry; /* Number of block with at least one free entry */
-};
-
-#define V2_DQINFOOFF sizeof(struct v2_disk_dqheader) /* Offset of info header in file */
-#define V2_DQBLKSIZE_BITS 10 /* Size of leaf block in tree */
-
-#endif /* _LINUX_QUOTAIO_V2_H */
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