[linux-2.6-block.git] / fs / afs / super.c

/* AFS superblock handling
 *
 * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
 *
 * This software may be freely redistributed under the terms of the
 * GNU General Public License.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Authors: David Howells <dhowells@redhat.com>
 *          David Woodhouse <dwmw2@infradead.org>
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/statfs.h>
#include <linux/sched.h>
#include <linux/nsproxy.h>
#include <linux/magic.h>
#include <net/net_namespace.h>
#include "internal.h"

static void afs_i_init_once(void *foo);
static struct dentry *afs_mount(struct file_system_type *fs_type,
		      int flags, const char *dev_name, void *data);
static void afs_kill_super(struct super_block *sb);
static struct inode *afs_alloc_inode(struct super_block *sb);
static void afs_destroy_inode(struct inode *inode);
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int afs_show_devname(struct seq_file *m, struct dentry *root);
static int afs_show_options(struct seq_file *m, struct dentry *root);

struct file_system_type afs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "afs",
	.mount		= afs_mount,
	.kill_sb	= afs_kill_super,
	.fs_flags	= 0,
};
MODULE_ALIAS_FS("afs");

static const struct super_operations afs_super_ops = {
	.statfs		= afs_statfs,
	.alloc_inode	= afs_alloc_inode,
	.drop_inode	= afs_drop_inode,
	.destroy_inode	= afs_destroy_inode,
	.evict_inode	= afs_evict_inode,
	.show_devname	= afs_show_devname,
	.show_options	= afs_show_options,
};

static struct kmem_cache *afs_inode_cachep;
static atomic_t afs_count_active_inodes;

enum {
	afs_no_opt,
	afs_opt_cell,
	afs_opt_dyn,
	afs_opt_rwpath,
	afs_opt_vol,
	afs_opt_autocell,
};

static const match_table_t afs_options_list = {
	{ afs_opt_cell,		"cell=%s"	},
	{ afs_opt_dyn,		"dyn"		},
	{ afs_opt_rwpath,	"rwpath"	},
	{ afs_opt_vol,		"vol=%s"	},
	{ afs_opt_autocell,	"autocell"	},
	{ afs_no_opt,		NULL		},
};

/*
 * initialise the filesystem
 */
int __init afs_fs_init(void)
{
	int ret;

	_enter("");

	/* create ourselves an inode cache */
	atomic_set(&afs_count_active_inodes, 0);

	ret = -ENOMEM;
	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
					     sizeof(struct afs_vnode),
					     0,
					     SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
					     afs_i_init_once);
	if (!afs_inode_cachep) {
		printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
		return ret;
	}

	/* now export our filesystem to lesser mortals */
	ret = register_filesystem(&afs_fs_type);
	if (ret < 0) {
		kmem_cache_destroy(afs_inode_cachep);
		_leave(" = %d", ret);
		return ret;
	}

	_leave(" = 0");
	return 0;
}

/*
 * clean up the filesystem
 */
void __exit afs_fs_exit(void)
{
	_enter("");

	afs_mntpt_kill_timer();
	unregister_filesystem(&afs_fs_type);

	if (atomic_read(&afs_count_active_inodes) != 0) {
		printk("kAFS: %d active inode objects still present\n",
		       atomic_read(&afs_count_active_inodes));
		BUG();
	}

	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(afs_inode_cachep);
	_leave("");
}

/*
 * Display the mount device name in /proc/mounts.
 */
static int afs_show_devname(struct seq_file *m, struct dentry *root)
{
	struct afs_super_info *as = AFS_FS_S(root->d_sb);
	struct afs_volume *volume = as->volume;
	struct afs_cell *cell = as->cell;
	const char *suf = "";
	char pref = '%';

	if (as->dyn_root) {
		seq_puts(m, "none");
		return 0;
	}
	
	switch (volume->type) {
	case AFSVL_RWVOL:
		break;
	case AFSVL_ROVOL:
		pref = '#';
		if (volume->type_force)
			suf = ".readonly";
		break;
	case AFSVL_BACKVOL:
		pref = '#';
		suf = ".backup";
		break;
	}

	seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
	return 0;
}

/*
 * Display the mount options in /proc/mounts.
 */
static int afs_show_options(struct seq_file *m, struct dentry *root)
{
	struct afs_super_info *as = AFS_FS_S(root->d_sb);

	if (as->dyn_root)
		seq_puts(m, ",dyn");
	if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
		seq_puts(m, ",autocell");
	return 0;
}

/*
 * parse the mount options
 * - this function has been shamelessly adapted from the ext3 fs which
 *   shamelessly adapted it from the msdos fs
 */
static int afs_parse_options(struct afs_mount_params *params,
			     char *options, const char **devname)
{
	struct afs_cell *cell;
	substring_t args[MAX_OPT_ARGS];
	char *p;
	int token;

	_enter("%s", options);

	options[PAGE_SIZE - 1] = 0;

	while ((p = strsep(&options, ","))) {
		if (!*p)
			continue;

		token = match_token(p, afs_options_list, args);
		switch (token) {
		case afs_opt_cell:
			rcu_read_lock();
			cell = afs_lookup_cell_rcu(params->net,
						   args[0].from,
						   args[0].to - args[0].from);
			rcu_read_unlock();
			if (IS_ERR(cell))
				return PTR_ERR(cell);
			afs_put_cell(params->net, params->cell);
			params->cell = cell;
			break;

		case afs_opt_rwpath:
			params->rwpath = true;
			break;

		case afs_opt_vol:
			*devname = args[0].from;
			break;

		case afs_opt_autocell:
			params->autocell = true;
			break;

		case afs_opt_dyn:
			params->dyn_root = true;
			break;

		default:
			printk(KERN_ERR "kAFS:"
			       " Unknown or invalid mount option: '%s'\n", p);
			return -EINVAL;
		}
	}

	_leave(" = 0");
	return 0;
}

/*
 * parse a device name to get cell name, volume name, volume type and R/W
 * selector
 * - this can be one of the following:
 *	"%[cell:]volume[.]"		R/W volume
 *	"#[cell:]volume[.]"		R/O or R/W volume (rwpath=0),
 *					 or R/W (rwpath=1) volume
 *	"%[cell:]volume.readonly"	R/O volume
 *	"#[cell:]volume.readonly"	R/O volume
 *	"%[cell:]volume.backup"		Backup volume
 *	"#[cell:]volume.backup"		Backup volume
 */
static int afs_parse_device_name(struct afs_mount_params *params,
				 const char *name)
{
	struct afs_cell *cell;
	const char *cellname, *suffix;
	int cellnamesz;

	_enter(",%s", name);
	
	if (!name) {
		printk(KERN_ERR "kAFS: no volume name specified\n");
		return -EINVAL;
	}

	if ((name[0] != '%' && name[0] != '#') || !name[1]) {
		printk(KERN_ERR "kAFS: unparsable volume name\n");
		return -EINVAL;
	}

	/* determine the type of volume we're looking for */
	params->type = AFSVL_ROVOL;
	params->force = false;
	if (params->rwpath || name[0] == '%') {
		params->type = AFSVL_RWVOL;
		params->force = true;
	}
	name++;

	/* split the cell name out if there is one */
	params->volname = strchr(name, ':');
	if (params->volname) {
		cellname = name;
		cellnamesz = params->volname - name;
		params->volname++;
	} else {
		params->volname = name;
		cellname = NULL;
		cellnamesz = 0;
	}

	/* the volume type is further affected by a possible suffix */
	suffix = strrchr(params->volname, '.');
	if (suffix) {
		if (strcmp(suffix, ".readonly") == 0) {
			params->type = AFSVL_ROVOL;
			params->force = true;
		} else if (strcmp(suffix, ".backup") == 0) {
			params->type = AFSVL_BACKVOL;
			params->force = true;
		} else if (suffix[1] == 0) {
		} else {
			suffix = NULL;
		}
	}

	params->volnamesz = suffix ?
		suffix - params->volname : strlen(params->volname);

	_debug("cell %*.*s [%p]",
	       cellnamesz, cellnamesz, cellname ?: "", params->cell);

	/* lookup the cell record */
	if (cellname || !params->cell) {
		cell = afs_lookup_cell(params->net, cellname, cellnamesz,
				       NULL, false);
		if (IS_ERR(cell)) {
			printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
			       cellnamesz, cellnamesz, cellname ?: "");
			return PTR_ERR(cell);
		}
		afs_put_cell(params->net, params->cell);
		params->cell = cell;
	}

	_debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
	       params->cell->name, params->cell,
	       params->volnamesz, params->volnamesz, params->volname,
	       suffix ?: "-", params->type, params->force ? " FORCE" : "");

	return 0;
}

/*
 * check a superblock to see if it's the one we're looking for
 */
static int afs_test_super(struct super_block *sb, void *data)
{
	struct afs_super_info *as1 = data;
	struct afs_super_info *as = AFS_FS_S(sb);

	return (as->net == as1->net &&
		as->volume &&
		as->volume->vid == as1->volume->vid);
}

static int afs_dynroot_test_super(struct super_block *sb, void *data)
{
	return false;
}

static int afs_set_super(struct super_block *sb, void *data)
{
	struct afs_super_info *as = data;

	sb->s_fs_info = as;
	return set_anon_super(sb, NULL);
}

/*
 * fill in the superblock
 */
static int afs_fill_super(struct super_block *sb,
			  struct afs_mount_params *params)
{
	struct afs_super_info *as = AFS_FS_S(sb);
	struct afs_fid fid;
	struct inode *inode = NULL;
	int ret;

	_enter("");

	/* fill in the superblock */
	sb->s_blocksize		= PAGE_SIZE;
	sb->s_blocksize_bits	= PAGE_SHIFT;
	sb->s_magic		= AFS_FS_MAGIC;
	sb->s_op		= &afs_super_ops;
	if (!as->dyn_root)
		sb->s_xattr	= afs_xattr_handlers;
	ret = super_setup_bdi(sb);
	if (ret)
		return ret;
	sb->s_bdi->ra_pages	= VM_MAX_READAHEAD * 1024 / PAGE_SIZE;

	/* allocate the root inode and dentry */
	if (as->dyn_root) {
		inode = afs_iget_pseudo_dir(sb, true);
		sb->s_flags	|= SB_RDONLY;
	} else {
		sprintf(sb->s_id, "%u", as->volume->vid);
		afs_activate_volume(as->volume);
		fid.vid		= as->volume->vid;
		fid.vnode	= 1;
		fid.unique	= 1;
		inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
	}

	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (params->autocell || params->dyn_root)
		set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);

	ret = -ENOMEM;
	sb->s_root = d_make_root(inode);
	if (!sb->s_root)
		goto error;

	sb->s_d_op = &afs_fs_dentry_operations;

	_leave(" = 0");
	return 0;

error:
	_leave(" = %d", ret);
	return ret;
}

static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
{
	struct afs_super_info *as;

	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
	if (as) {
		as->net = afs_get_net(params->net);
		if (params->dyn_root)
			as->dyn_root = true;
		else
			as->cell = afs_get_cell(params->cell);
	}
	return as;
}

static void afs_destroy_sbi(struct afs_super_info *as)
{
	if (as) {
		afs_put_volume(as->cell, as->volume);
		afs_put_cell(as->net, as->cell);
		afs_put_net(as->net);
		kfree(as);
	}
}

/*
 * get an AFS superblock
 */
static struct dentry *afs_mount(struct file_system_type *fs_type,
				int flags, const char *dev_name, void *options)
{
	struct afs_mount_params params;
	struct super_block *sb;
	struct afs_volume *candidate;
	struct key *key;
	struct afs_super_info *as;
	int ret;

	_enter(",,%s,%p", dev_name, options);

	memset(&params, 0, sizeof(params));
	params.net = &__afs_net;

	ret = -EINVAL;
	if (current->nsproxy->net_ns != &init_net)
		goto error;

	/* parse the options and device name */
	if (options) {
		ret = afs_parse_options(&params, options, &dev_name);
		if (ret < 0)
			goto error;
	}

	if (!params.dyn_root) {
		ret = afs_parse_device_name(&params, dev_name);
		if (ret < 0)
			goto error;

		/* try and do the mount securely */
		key = afs_request_key(params.cell);
		if (IS_ERR(key)) {
			_leave(" = %ld [key]", PTR_ERR(key));
			ret = PTR_ERR(key);
			goto error;
		}
		params.key = key;
	}

	/* allocate a superblock info record */
	ret = -ENOMEM;
	as = afs_alloc_sbi(&params);
	if (!as)
		goto error_key;

	if (!params.dyn_root) {
		/* Assume we're going to need a volume record; at the very
		 * least we can use it to update the volume record if we have
		 * one already.  This checks that the volume exists within the
		 * cell.
		 */
		candidate = afs_create_volume(&params);
		if (IS_ERR(candidate)) {
			ret = PTR_ERR(candidate);
			goto error_as;
		}

		as->volume = candidate;
	}

	/* allocate a deviceless superblock */
	sb = sget(fs_type,
		  as->dyn_root ? afs_dynroot_test_super : afs_test_super,
		  afs_set_super, flags, as);
	if (IS_ERR(sb)) {
		ret = PTR_ERR(sb);
		goto error_as;
	}

	if (!sb->s_root) {
		/* initial superblock/root creation */
		_debug("create");
		ret = afs_fill_super(sb, &params);
		if (ret < 0)
			goto error_sb;
		as = NULL;
		sb->s_flags |= SB_ACTIVE;
	} else {
		_debug("reuse");
		ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
		afs_destroy_sbi(as);
		as = NULL;
	}

	afs_put_cell(params.net, params.cell);
	key_put(params.key);
	_leave(" = 0 [%p]", sb);
	return dget(sb->s_root);

error_sb:
	deactivate_locked_super(sb);
	goto error_key;
error_as:
	afs_destroy_sbi(as);
error_key:
	key_put(params.key);
error:
	afs_put_cell(params.net, params.cell);
	_leave(" = %d", ret);
	return ERR_PTR(ret);
}

static void afs_kill_super(struct super_block *sb)
{
	struct afs_super_info *as = AFS_FS_S(sb);

	/* Clear the callback interests (which will do ilookup5) before
	 * deactivating the superblock.
	 */
	if (as->volume)
		afs_clear_callback_interests(as->net, as->volume->servers);
	kill_anon_super(sb);
	if (as->volume)
		afs_deactivate_volume(as->volume);
	afs_destroy_sbi(as);
}

/*
 * Initialise an inode cache slab element prior to any use.  Note that
 * afs_alloc_inode() *must* reset anything that could incorrectly leak from one
 * inode to another.
 */
static void afs_i_init_once(void *_vnode)
{
	struct afs_vnode *vnode = _vnode;

	memset(vnode, 0, sizeof(*vnode));
	inode_init_once(&vnode->vfs_inode);
	mutex_init(&vnode->io_lock);
	mutex_init(&vnode->validate_lock);
	spin_lock_init(&vnode->wb_lock);
	spin_lock_init(&vnode->lock);
	INIT_LIST_HEAD(&vnode->wb_keys);
	INIT_LIST_HEAD(&vnode->pending_locks);
	INIT_LIST_HEAD(&vnode->granted_locks);
	INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
	seqlock_init(&vnode->cb_lock);
}

/*
 * allocate an AFS inode struct from our slab cache
 */
static struct inode *afs_alloc_inode(struct super_block *sb)
{
	struct afs_vnode *vnode;

	vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
	if (!vnode)
		return NULL;

	atomic_inc(&afs_count_active_inodes);

	/* Reset anything that shouldn't leak from one inode to the next. */
	memset(&vnode->fid, 0, sizeof(vnode->fid));
	memset(&vnode->status, 0, sizeof(vnode->status));

	vnode->volume		= NULL;
	vnode->lock_key		= NULL;
	vnode->permit_cache	= NULL;
	vnode->cb_interest	= NULL;
#ifdef CONFIG_AFS_FSCACHE
	vnode->cache		= NULL;
#endif

	vnode->flags		= 1 << AFS_VNODE_UNSET;
	vnode->cb_type		= 0;
	vnode->lock_state	= AFS_VNODE_LOCK_NONE;

	_leave(" = %p", &vnode->vfs_inode);
	return &vnode->vfs_inode;
}

static void afs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	struct afs_vnode *vnode = AFS_FS_I(inode);
	kmem_cache_free(afs_inode_cachep, vnode);
}

/*
 * destroy an AFS inode struct
 */
static void afs_destroy_inode(struct inode *inode)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);

	_enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);

	_debug("DESTROY INODE %p", inode);

	ASSERTCMP(vnode->cb_interest, ==, NULL);

	call_rcu(&inode->i_rcu, afs_i_callback);
	atomic_dec(&afs_count_active_inodes);
}

/*
 * return information about an AFS volume
 */
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
	struct afs_fs_cursor fc;
	struct afs_volume_status vs;
	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
	struct key *key;
	int ret;

	buf->f_type	= dentry->d_sb->s_magic;
	buf->f_bsize	= AFS_BLOCK_SIZE;
	buf->f_namelen	= AFSNAMEMAX - 1;

	if (as->dyn_root) {
		buf->f_blocks	= 1;
		buf->f_bavail	= 0;
		buf->f_bfree	= 0;
		return 0;
	}
	
	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key))
		return PTR_ERR(key);

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, vnode, key)) {
		fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
		while (afs_select_fileserver(&fc)) {
			fc.cb_break = vnode->cb_break + vnode->cb_s_break;
			afs_fs_get_volume_status(&fc, &vs);
		}

		afs_check_for_remote_deletion(&fc, fc.vnode);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
		ret = afs_end_vnode_operation(&fc);
	}

	key_put(key);

	if (ret == 0) {
		if (vs.max_quota == 0)
			buf->f_blocks = vs.part_max_blocks;
		else
			buf->f_blocks = vs.max_quota;
		buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
	}

	return ret;
}
Commit	Line	Data
ec26815a DH	1	/* AFS superblock handling
ec26815a DH	2	*
08e0e7c8	3	* Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
1da177e4 LT	4	*
	5	* This software may be freely redistributed under the terms of the
	6	* GNU General Public License.
	7	*
	8	* You should have received a copy of the GNU General Public License
	9	* along with this program; if not, write to the Free Software
	10	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	11	*
	12	* Authors: David Howells <dhowells@redhat.com>
44d1b980	13	* David Woodhouse <dwmw2@infradead.org>
1da177e4 LT	14	*
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
bec5eb61	19	#include <linux/mount.h>
1da177e4 LT	20	#include <linux/init.h>
	21	#include <linux/slab.h>
	22	#include <linux/fs.h>
	23	#include <linux/pagemap.h>
80c72fe4	24	#include <linux/parser.h>
45222b9e	25	#include <linux/statfs.h>
e8edc6e0	26	#include <linux/sched.h>
f74f70f8	27	#include <linux/nsproxy.h>
f044c884	28	#include <linux/magic.h>
f74f70f8	29	#include <net/net_namespace.h>
1da177e4 LT	30	#include "internal.h"
1da177e4 LT	31
51cc5068	32	static void afs_i_init_once(void *foo);
f7442b3b AV	33	static struct dentry afs_mount(struct file_system_type fs_type,
f7442b3b AV	34	int flags, const char dev_name, void data);
dde194a6	35	static void afs_kill_super(struct super_block *sb);
1da177e4	36	static struct inode afs_alloc_inode(struct super_block sb);
1da177e4	37	static void afs_destroy_inode(struct inode *inode);
45222b9e	38	static int afs_statfs(struct dentry dentry, struct kstatfs buf);
677018a6 DH	39	static int afs_show_devname(struct seq_file m, struct dentry root);
677018a6 DH	40	static int afs_show_options(struct seq_file m, struct dentry root);
1da177e4	41
1f5ce9e9	42	struct file_system_type afs_fs_type = {
1da177e4 LT	43	.owner = THIS_MODULE,
1da177e4 LT	44	.name = "afs",
f7442b3b	45	.mount = afs_mount,
dde194a6	46	.kill_sb = afs_kill_super,
80c72fe4	47	.fs_flags = 0,
1da177e4	48	};
7f78e035	49	MODULE_ALIAS_FS("afs");
1da177e4	50
ee9b6d61	51	static const struct super_operations afs_super_ops = {
45222b9e	52	.statfs = afs_statfs,
1da177e4	53	.alloc_inode = afs_alloc_inode,
bec5eb61	54	.drop_inode = afs_drop_inode,
1da177e4	55	.destroy_inode = afs_destroy_inode,
b57922d9	56	.evict_inode = afs_evict_inode,
677018a6 DH	57	.show_devname = afs_show_devname,
677018a6 DH	58	.show_options = afs_show_options,
1da177e4 LT	59	};
1da177e4 LT	60
e18b890b	61	static struct kmem_cache *afs_inode_cachep;
1da177e4 LT	62	static atomic_t afs_count_active_inodes;
1da177e4 LT	63
80c72fe4 DH	64	enum {
	65	afs_no_opt,
	66	afs_opt_cell,
4d673da1	67	afs_opt_dyn,
80c72fe4 DH	68	afs_opt_rwpath,
80c72fe4 DH	69	afs_opt_vol,
bec5eb61	70	afs_opt_autocell,
80c72fe4 DH	71	};
80c72fe4 DH	72
a447c093	73	static const match_table_t afs_options_list = {
80c72fe4	74	{ afs_opt_cell, "cell=%s" },
4d673da1	75	{ afs_opt_dyn, "dyn" },
80c72fe4 DH	76	{ afs_opt_rwpath, "rwpath" },
80c72fe4 DH	77	{ afs_opt_vol, "vol=%s" },
bec5eb61	78	{ afs_opt_autocell, "autocell" },
80c72fe4 DH	79	{ afs_no_opt, NULL },
	80	};
	81
1da177e4 LT	82	/*
	83	* initialise the filesystem
	84	*/
	85	int __init afs_fs_init(void)
	86	{
	87	int ret;
	88
	89	_enter("");
	90
1da177e4 LT	91	/* create ourselves an inode cache */
	92	atomic_set(&afs_count_active_inodes, 0);
	93
	94	ret = -ENOMEM;
	95	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
	96	sizeof(struct afs_vnode),
	97	0,
5d097056	98	SLAB_HWCACHE_ALIGN\|SLAB_ACCOUNT,
20c2df83	99	afs_i_init_once);
1da177e4 LT	100	if (!afs_inode_cachep) {
	101	printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
	102	return ret;
	103	}
	104
	105	/* now export our filesystem to lesser mortals */
	106	ret = register_filesystem(&afs_fs_type);
	107	if (ret < 0) {
	108	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	109	_leave(" = %d", ret);
1da177e4 LT	110	return ret;
	111	}
	112
08e0e7c8	113	_leave(" = 0");
1da177e4	114	return 0;
ec26815a	115	}
1da177e4	116
1da177e4 LT	117	/*
	118	* clean up the filesystem
	119	*/
	120	void __exit afs_fs_exit(void)
	121	{
08e0e7c8 DH	122	_enter("");
	123
	124	afs_mntpt_kill_timer();
1da177e4 LT	125	unregister_filesystem(&afs_fs_type);
	126
	127	if (atomic_read(&afs_count_active_inodes) != 0) {
	128	printk("kAFS: %d active inode objects still present\n",
	129	atomic_read(&afs_count_active_inodes));
	130	BUG();
	131	}
	132
8c0a8537 KS	133	/*
	134	* Make sure all delayed rcu free inodes are flushed before we
	135	* destroy cache.
	136	*/
	137	rcu_barrier();
1da177e4	138	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	139	_leave("");
ec26815a	140	}
1da177e4	141
677018a6 DH	142	/*
	143	* Display the mount device name in /proc/mounts.
	144	*/
	145	static int afs_show_devname(struct seq_file m, struct dentry root)
	146	{
d2ddc776	147	struct afs_super_info *as = AFS_FS_S(root->d_sb);
677018a6	148	struct afs_volume *volume = as->volume;
d2ddc776	149	struct afs_cell *cell = as->cell;
677018a6 DH	150	const char *suf = "";
	151	char pref = '%';
	152
4d673da1 DH	153	if (as->dyn_root) {
	154	seq_puts(m, "none");
	155	return 0;
	156	}
	157
677018a6 DH	158	switch (volume->type) {
	159	case AFSVL_RWVOL:
	160	break;
	161	case AFSVL_ROVOL:
	162	pref = '#';
	163	if (volume->type_force)
	164	suf = ".readonly";
	165	break;
	166	case AFSVL_BACKVOL:
	167	pref = '#';
	168	suf = ".backup";
	169	break;
	170	}
	171
d2ddc776	172	seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
677018a6 DH	173	return 0;
	174	}
	175
	176	/*
	177	* Display the mount options in /proc/mounts.
	178	*/
	179	static int afs_show_options(struct seq_file m, struct dentry root)
	180	{
4d673da1 DH	181	struct afs_super_info *as = AFS_FS_S(root->d_sb);
	182
	183	if (as->dyn_root)
	184	seq_puts(m, ",dyn");
677018a6	185	if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
4d673da1	186	seq_puts(m, ",autocell");
677018a6 DH	187	return 0;
	188	}
	189
1da177e4 LT	190	/*
	191	* parse the mount options
	192	* - this function has been shamelessly adapted from the ext3 fs which
	193	* shamelessly adapted it from the msdos fs
	194	*/
00d3b7a4 DH	195	static int afs_parse_options(struct afs_mount_params *params,
00d3b7a4 DH	196	char options, const char *devname)
1da177e4	197	{
08e0e7c8	198	struct afs_cell *cell;
80c72fe4 DH	199	substring_t args[MAX_OPT_ARGS];
	200	char *p;
	201	int token;
1da177e4 LT	202
	203	_enter("%s", options);
	204
	205	options[PAGE_SIZE - 1] = 0;
	206
80c72fe4 DH	207	while ((p = strsep(&options, ","))) {
	208	if (!*p)
	209	continue;
1da177e4	210
80c72fe4 DH	211	token = match_token(p, afs_options_list, args);
	212	switch (token) {
	213	case afs_opt_cell:
989782dc DH	214	rcu_read_lock();
	215	cell = afs_lookup_cell_rcu(params->net,
	216	args[0].from,
	217	args[0].to - args[0].from);
	218	rcu_read_unlock();
08e0e7c8 DH	219	if (IS_ERR(cell))
08e0e7c8 DH	220	return PTR_ERR(cell);
9ed900b1	221	afs_put_cell(params->net, params->cell);
00d3b7a4	222	params->cell = cell;
80c72fe4 DH	223	break;
	224
	225	case afs_opt_rwpath:
4d673da1	226	params->rwpath = true;
80c72fe4 DH	227	break;
	228
	229	case afs_opt_vol:
	230	*devname = args[0].from;
	231	break;
	232
bec5eb61	233	case afs_opt_autocell:
4d673da1 DH	234	params->autocell = true;
	235	break;
	236
	237	case afs_opt_dyn:
	238	params->dyn_root = true;
bec5eb61	239	break;
bec5eb61	240
80c72fe4 DH	241	default:
	242	printk(KERN_ERR "kAFS:"
	243	" Unknown or invalid mount option: '%s'\n", p);
	244	return -EINVAL;
1da177e4	245	}
1da177e4 LT	246	}
1da177e4 LT	247
80c72fe4 DH	248	_leave(" = 0");
80c72fe4 DH	249	return 0;
ec26815a	250	}
1da177e4	251
00d3b7a4 DH	252	/*
	253	* parse a device name to get cell name, volume name, volume type and R/W
	254	* selector
	255	* - this can be one of the following:
	256	* "%[cell:]volume[.]" R/W volume
	257	* "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
	258	* or R/W (rwpath=1) volume
	259	* "%[cell:]volume.readonly" R/O volume
	260	* "#[cell:]volume.readonly" R/O volume
	261	* "%[cell:]volume.backup" Backup volume
	262	* "#[cell:]volume.backup" Backup volume
	263	*/
	264	static int afs_parse_device_name(struct afs_mount_params *params,
	265	const char *name)
	266	{
	267	struct afs_cell *cell;
	268	const char cellname, suffix;
	269	int cellnamesz;
	270
	271	_enter(",%s", name);
4d673da1	272
00d3b7a4 DH	273	if (!name) {
	274	printk(KERN_ERR "kAFS: no volume name specified\n");
	275	return -EINVAL;
	276	}
	277
	278	if ((name[0] != '%' && name[0] != '#') \|\| !name[1]) {
	279	printk(KERN_ERR "kAFS: unparsable volume name\n");
	280	return -EINVAL;
	281	}
	282
	283	/* determine the type of volume we're looking for */
	284	params->type = AFSVL_ROVOL;
	285	params->force = false;
	286	if (params->rwpath \|\| name[0] == '%') {
	287	params->type = AFSVL_RWVOL;
	288	params->force = true;
	289	}
	290	name++;
	291
	292	/* split the cell name out if there is one */
	293	params->volname = strchr(name, ':');
	294	if (params->volname) {
	295	cellname = name;
	296	cellnamesz = params->volname - name;
	297	params->volname++;
	298	} else {
	299	params->volname = name;
	300	cellname = NULL;
	301	cellnamesz = 0;
	302	}
	303
	304	/* the volume type is further affected by a possible suffix */
	305	suffix = strrchr(params->volname, '.');
	306	if (suffix) {
	307	if (strcmp(suffix, ".readonly") == 0) {
	308	params->type = AFSVL_ROVOL;
	309	params->force = true;
	310	} else if (strcmp(suffix, ".backup") == 0) {
	311	params->type = AFSVL_BACKVOL;
	312	params->force = true;
	313	} else if (suffix[1] == 0) {
	314	} else {
	315	suffix = NULL;
	316	}
	317	}
	318
	319	params->volnamesz = suffix ?
	320	suffix - params->volname : strlen(params->volname);
	321
	322	_debug("cell %.s [%p]",
	323	cellnamesz, cellnamesz, cellname ?: "", params->cell);
	324
	325	/* lookup the cell record */
	326	if (cellname \|\| !params->cell) {
989782dc DH	327	cell = afs_lookup_cell(params->net, cellname, cellnamesz,
989782dc DH	328	NULL, false);
00d3b7a4	329	if (IS_ERR(cell)) {
bec5eb61	330	printk(KERN_ERR "kAFS: unable to lookup cell '%.s'\n",
bec5eb61	331	cellnamesz, cellnamesz, cellname ?: "");
00d3b7a4 DH	332	return PTR_ERR(cell);
00d3b7a4 DH	333	}
9ed900b1	334	afs_put_cell(params->net, params->cell);
00d3b7a4 DH	335	params->cell = cell;
	336	}
	337
	338	_debug("CELL:%s [%p] VOLUME:%.s SUFFIX:%s TYPE:%d%s",
	339	params->cell->name, params->cell,
	340	params->volnamesz, params->volnamesz, params->volname,
	341	suffix ?: "-", params->type, params->force ? " FORCE" : "");
	342
	343	return 0;
	344	}
	345
1da177e4 LT	346	/*
	347	* check a superblock to see if it's the one we're looking for
	348	*/
	349	static int afs_test_super(struct super_block sb, void data)
	350	{
dde194a6	351	struct afs_super_info *as1 = data;
d2ddc776	352	struct afs_super_info *as = AFS_FS_S(sb);
1da177e4	353
4d673da1 DH	354	return (as->net == as1->net &&
	355	as->volume &&
	356	as->volume->vid == as1->volume->vid);
	357	}
	358
	359	static int afs_dynroot_test_super(struct super_block sb, void data)
	360	{
	361	return false;
dde194a6 AV	362	}
	363
	364	static int afs_set_super(struct super_block sb, void data)
	365	{
d2ddc776 DH	366	struct afs_super_info *as = data;
	367
	368	sb->s_fs_info = as;
dde194a6	369	return set_anon_super(sb, NULL);
ec26815a	370	}
1da177e4	371
1da177e4 LT	372	/*
	373	* fill in the superblock
	374	*/
dde194a6 AV	375	static int afs_fill_super(struct super_block *sb,
dde194a6 AV	376	struct afs_mount_params *params)
1da177e4	377	{
d2ddc776	378	struct afs_super_info *as = AFS_FS_S(sb);
1da177e4	379	struct afs_fid fid;
1da177e4 LT	380	struct inode *inode = NULL;
	381	int ret;
	382
08e0e7c8	383	_enter("");
1da177e4	384
1da177e4	385	/* fill in the superblock */
09cbfeaf KS	386	sb->s_blocksize = PAGE_SIZE;
09cbfeaf KS	387	sb->s_blocksize_bits = PAGE_SHIFT;
1da177e4 LT	388	sb->s_magic = AFS_FS_MAGIC;
1da177e4 LT	389	sb->s_op = &afs_super_ops;
4d673da1 DH	390	if (!as->dyn_root)
4d673da1 DH	391	sb->s_xattr = afs_xattr_handlers;
edd3ba94 JK	392	ret = super_setup_bdi(sb);
	393	if (ret)
	394	return ret;
	395	sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
1da177e4 LT	396
1da177e4 LT	397	/* allocate the root inode and dentry */
4d673da1 DH	398	if (as->dyn_root) {
	399	inode = afs_iget_pseudo_dir(sb, true);
	400	sb->s_flags \|= SB_RDONLY;
	401	} else {
	402	sprintf(sb->s_id, "%u", as->volume->vid);
	403	afs_activate_volume(as->volume);
	404	fid.vid = as->volume->vid;
	405	fid.vnode = 1;
	406	fid.unique = 1;
	407	inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
	408	}
	409
08e0e7c8	410	if (IS_ERR(inode))
dde194a6	411	return PTR_ERR(inode);
1da177e4	412
4d673da1	413	if (params->autocell \|\| params->dyn_root)
bec5eb61	414	set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
bec5eb61	415
1da177e4	416	ret = -ENOMEM;
48fde701 AV	417	sb->s_root = d_make_root(inode);
48fde701 AV	418	if (!sb->s_root)
1da177e4 LT	419	goto error;
1da177e4 LT	420
d61dcce2	421	sb->s_d_op = &afs_fs_dentry_operations;
1da177e4	422
08e0e7c8	423	_leave(" = 0");
1da177e4 LT	424	return 0;
1da177e4 LT	425
ec26815a	426	error:
08e0e7c8	427	_leave(" = %d", ret);
1da177e4	428	return ret;
ec26815a	429	}
1da177e4	430
49566f6f DH	431	static struct afs_super_info afs_alloc_sbi(struct afs_mount_params params)
	432	{
	433	struct afs_super_info *as;
	434
	435	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
	436	if (as) {
	437	as->net = afs_get_net(params->net);
4d673da1 DH	438	if (params->dyn_root)
	439	as->dyn_root = true;
	440	else
	441	as->cell = afs_get_cell(params->cell);
49566f6f DH	442	}
	443	return as;
	444	}
	445
	446	static void afs_destroy_sbi(struct afs_super_info *as)
	447	{
	448	if (as) {
9ed900b1 DH	449	afs_put_volume(as->cell, as->volume);
9ed900b1 DH	450	afs_put_cell(as->net, as->cell);
49566f6f DH	451	afs_put_net(as->net);
	452	kfree(as);
	453	}
	454	}
	455
1da177e4 LT	456	/*
1da177e4 LT	457	* get an AFS superblock
1da177e4	458	*/
f7442b3b	459	static struct dentry afs_mount(struct file_system_type fs_type,
49566f6f	460	int flags, const char dev_name, void options)
1da177e4 LT	461	{
	462	struct afs_mount_params params;
	463	struct super_block *sb;
d2ddc776	464	struct afs_volume *candidate;
00d3b7a4	465	struct key *key;
dde194a6	466	struct afs_super_info *as;
1da177e4 LT	467	int ret;
	468
	469	_enter(",,%s,%p", dev_name, options);
	470
	471	memset(&params, 0, sizeof(params));
f044c884	472	params.net = &__afs_net;
1da177e4	473
f74f70f8 EB	474	ret = -EINVAL;
	475	if (current->nsproxy->net_ns != &init_net)
	476	goto error;
	477
00d3b7a4	478	/* parse the options and device name */
1da177e4	479	if (options) {
00d3b7a4	480	ret = afs_parse_options(&params, options, &dev_name);
1da177e4 LT	481	if (ret < 0)
1da177e4 LT	482	goto error;
1da177e4 LT	483	}
1da177e4 LT	484
4d673da1 DH	485	if (!params.dyn_root) {
	486	ret = afs_parse_device_name(&params, dev_name);
	487	if (ret < 0)
	488	goto error;
00d3b7a4	489
4d673da1 DH	490	/* try and do the mount securely */
	491	key = afs_request_key(params.cell);
	492	if (IS_ERR(key)) {
	493	_leave(" = %ld [key]", PTR_ERR(key));
	494	ret = PTR_ERR(key);
	495	goto error;
	496	}
	497	params.key = key;
00d3b7a4	498	}
00d3b7a4	499
49566f6f DH	500	/* allocate a superblock info record */
	501	ret = -ENOMEM;
	502	as = afs_alloc_sbi(&params);
	503	if (!as)
d2ddc776	504	goto error_key;
49566f6f	505
4d673da1 DH	506	if (!params.dyn_root) {
	507	/* Assume we're going to need a volume record; at the very
	508	* least we can use it to update the volume record if we have
	509	* one already. This checks that the volume exists within the
	510	* cell.
	511	*/
	512	candidate = afs_create_volume(&params);
	513	if (IS_ERR(candidate)) {
	514	ret = PTR_ERR(candidate);
	515	goto error_as;
	516	}
d2ddc776	517
4d673da1 DH	518	as->volume = candidate;
4d673da1 DH	519	}
1da177e4 LT	520
1da177e4 LT	521	/* allocate a deviceless superblock */
4d673da1 DH	522	sb = sget(fs_type,
	523	as->dyn_root ? afs_dynroot_test_super : afs_test_super,
	524	afs_set_super, flags, as);
08e0e7c8 DH	525	if (IS_ERR(sb)) {
08e0e7c8 DH	526	ret = PTR_ERR(sb);
f044c884	527	goto error_as;
08e0e7c8	528	}
1da177e4	529
436058a4 DH	530	if (!sb->s_root) {
	531	/* initial superblock/root creation */
	532	_debug("create");
436058a4	533	ret = afs_fill_super(sb, &params);
f044c884 DH	534	if (ret < 0)
f044c884 DH	535	goto error_sb;
49566f6f	536	as = NULL;
1751e8a6	537	sb->s_flags \|= SB_ACTIVE;
436058a4 DH	538	} else {
436058a4 DH	539	_debug("reuse");
1751e8a6	540	ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
49566f6f DH	541	afs_destroy_sbi(as);
49566f6f DH	542	as = NULL;
1da177e4	543	}
1da177e4	544
9ed900b1	545	afs_put_cell(params.net, params.cell);
49566f6f	546	key_put(params.key);
08e0e7c8	547	_leave(" = 0 [%p]", sb);
f7442b3b	548	return dget(sb->s_root);
1da177e4	549
f044c884 DH	550	error_sb:
f044c884 DH	551	deactivate_locked_super(sb);
d2ddc776	552	goto error_key;
f044c884	553	error_as:
49566f6f	554	afs_destroy_sbi(as);
d2ddc776 DH	555	error_key:
d2ddc776 DH	556	key_put(params.key);
ec26815a	557	error:
9ed900b1	558	afs_put_cell(params.net, params.cell);
1da177e4	559	_leave(" = %d", ret);
f7442b3b	560	return ERR_PTR(ret);
ec26815a	561	}
1da177e4	562
dde194a6	563	static void afs_kill_super(struct super_block *sb)
1da177e4	564	{
c435ee34	565	struct afs_super_info *as = AFS_FS_S(sb);
f044c884	566
c435ee34 DH	567	/* Clear the callback interests (which will do ilookup5) before
	568	* deactivating the superblock.
	569	*/
4d673da1 DH	570	if (as->volume)
4d673da1 DH	571	afs_clear_callback_interests(as->net, as->volume->servers);
dde194a6	572	kill_anon_super(sb);
4d673da1 DH	573	if (as->volume)
4d673da1 DH	574	afs_deactivate_volume(as->volume);
49566f6f	575	afs_destroy_sbi(as);
ec26815a	576	}
1da177e4	577
1da177e4	578	/*
f8de483e DH	579	* Initialise an inode cache slab element prior to any use. Note that
	580	* afs_alloc_inode() must reset anything that could incorrectly leak from one
	581	* inode to another.
1da177e4	582	*/
51cc5068	583	static void afs_i_init_once(void *_vnode)
1da177e4	584	{
ec26815a	585	struct afs_vnode *vnode = _vnode;
1da177e4	586
a35afb83 CL	587	memset(vnode, 0, sizeof(*vnode));
a35afb83 CL	588	inode_init_once(&vnode->vfs_inode);
d2ddc776	589	mutex_init(&vnode->io_lock);
a35afb83	590	mutex_init(&vnode->validate_lock);
4343d008	591	spin_lock_init(&vnode->wb_lock);
a35afb83	592	spin_lock_init(&vnode->lock);
4343d008	593	INIT_LIST_HEAD(&vnode->wb_keys);
e8d6c554 DH	594	INIT_LIST_HEAD(&vnode->pending_locks);
	595	INIT_LIST_HEAD(&vnode->granted_locks);
	596	INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
c435ee34	597	seqlock_init(&vnode->cb_lock);
ec26815a	598	}
1da177e4	599
1da177e4 LT	600	/*
	601	* allocate an AFS inode struct from our slab cache
	602	*/
	603	static struct inode afs_alloc_inode(struct super_block sb)
	604	{
	605	struct afs_vnode *vnode;
	606
ec26815a	607	vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
1da177e4 LT	608	if (!vnode)
	609	return NULL;
	610
	611	atomic_inc(&afs_count_active_inodes);
	612
f8de483e	613	/* Reset anything that shouldn't leak from one inode to the next. */
1da177e4 LT	614	memset(&vnode->fid, 0, sizeof(vnode->fid));
	615	memset(&vnode->status, 0, sizeof(vnode->status));
	616
	617	vnode->volume = NULL;
f8de483e DH	618	vnode->lock_key = NULL;
	619	vnode->permit_cache = NULL;
	620	vnode->cb_interest = NULL;
	621	#ifdef CONFIG_AFS_FSCACHE
	622	vnode->cache = NULL;
	623	#endif
	624
260a9803	625	vnode->flags = 1 << AFS_VNODE_UNSET;
f8de483e DH	626	vnode->cb_type = 0;
f8de483e DH	627	vnode->lock_state = AFS_VNODE_LOCK_NONE;
1da177e4	628
0f300ca9	629	_leave(" = %p", &vnode->vfs_inode);
1da177e4	630	return &vnode->vfs_inode;
ec26815a	631	}
1da177e4	632
fa0d7e3d NP	633	static void afs_i_callback(struct rcu_head *head)
	634	{
	635	struct inode *inode = container_of(head, struct inode, i_rcu);
	636	struct afs_vnode *vnode = AFS_FS_I(inode);
fa0d7e3d NP	637	kmem_cache_free(afs_inode_cachep, vnode);
	638	}
	639
1da177e4 LT	640	/*
	641	* destroy an AFS inode struct
	642	*/
	643	static void afs_destroy_inode(struct inode *inode)
	644	{
08e0e7c8 DH	645	struct afs_vnode *vnode = AFS_FS_I(inode);
08e0e7c8 DH	646
0f300ca9	647	_enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
1da177e4	648
08e0e7c8 DH	649	_debug("DESTROY INODE %p", inode);
08e0e7c8 DH	650
c435ee34	651	ASSERTCMP(vnode->cb_interest, ==, NULL);
08e0e7c8	652
fa0d7e3d	653	call_rcu(&inode->i_rcu, afs_i_callback);
1da177e4	654	atomic_dec(&afs_count_active_inodes);
ec26815a	655	}
45222b9e DH	656
	657	/*
	658	* return information about an AFS volume
	659	*/
	660	static int afs_statfs(struct dentry dentry, struct kstatfs buf)
	661	{
4d673da1	662	struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
d2ddc776	663	struct afs_fs_cursor fc;
45222b9e	664	struct afs_volume_status vs;
2b0143b5	665	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
45222b9e DH	666	struct key *key;
	667	int ret;
	668
4d673da1 DH	669	buf->f_type = dentry->d_sb->s_magic;
	670	buf->f_bsize = AFS_BLOCK_SIZE;
	671	buf->f_namelen = AFSNAMEMAX - 1;
	672
	673	if (as->dyn_root) {
	674	buf->f_blocks = 1;
	675	buf->f_bavail = 0;
	676	buf->f_bfree = 0;
	677	return 0;
	678	}
	679
45222b9e DH	680	key = afs_request_key(vnode->volume->cell);
	681	if (IS_ERR(key))
	682	return PTR_ERR(key);
	683
d2ddc776 DH	684	ret = -ERESTARTSYS;
	685	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	686	fc.flags \|= AFS_FS_CURSOR_NO_VSLEEP;
	687	while (afs_select_fileserver(&fc)) {
	688	fc.cb_break = vnode->cb_break + vnode->cb_s_break;
	689	afs_fs_get_volume_status(&fc, &vs);
	690	}
	691
	692	afs_check_for_remote_deletion(&fc, fc.vnode);
	693	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	694	ret = afs_end_vnode_operation(&fc);
45222b9e DH	695	}
45222b9e DH	696
d2ddc776	697	key_put(key);
45222b9e	698
d2ddc776	699	if (ret == 0) {
d2ddc776 DH	700	if (vs.max_quota == 0)
	701	buf->f_blocks = vs.part_max_blocks;
	702	else
	703	buf->f_blocks = vs.max_quota;
	704	buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
	705	}
	706
	707	return ret;
45222b9e	708	}