* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (37 commits)
Btrfs: Make sure dir is non-null before doing S_ISGID checks
Btrfs: Fix memory leak in cache_drop_leaf_ref
Btrfs: don't return congestion in write_cache_pages as often
Btrfs: Only prep for btree deletion balances when nodes are mostly empty
Btrfs: fix btrfs_unlock_up_safe to walk the entire path
Btrfs: change btrfs_del_leaf to drop locks earlier
Btrfs: Change btrfs_truncate_inode_items to stop when it hits the inode
Btrfs: Don't try to compress pages past i_size
Btrfs: join the transaction in __btrfs_setxattr
Btrfs: Handle SGID bit when creating inodes
Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks
Btrfs: Change btree locking to use explicit blocking points
Btrfs: hash_lock is no longer needed
Btrfs: disable leak debugging checks in extent_io.c
Btrfs: sort references by byte number during btrfs_inc_ref
Btrfs: async threads should try harder to find work
Btrfs: selinux support
Btrfs: make btrfs acls selectable
Btrfs: Catch missed bios in the async bio submission thread
Btrfs: fix readdir on 32 bit machines
...
W: http://bu3sch.de/btgpio.php
S: Maintained
+BTRFS FILE SYSTEM
+P: Chris Mason
+M: chris.mason@oracle.com
+L: linux-btrfs@vger.kernel.org
+W: http://btrfs.wiki.kernel.org/
+T: git kernel.org:/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
+S: Maintained
+
BTTV VIDEO4LINUX DRIVER
P: Mauro Carvalho Chehab
M: mchehab@infradead.org
module will be called btrfs.
If unsure, say N.
+
+config BTRFS_FS_POSIX_ACL
+ bool "Btrfs POSIX Access Control Lists"
+ depends on BTRFS_FS
+ select FS_POSIX_ACL
+ help
+ POSIX Access Control Lists (ACLs) support permissions for users and
+ groups beyond the owner/group/world scheme.
+
+ To learn more about Access Control Lists, visit the POSIX ACLs for
+ Linux website <http://acl.bestbits.at/>.
+
+ If you don't know what Access Control Lists are, say N
* Boston, MA 021110-1307, USA.
*/
-#include <linux/version.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/spinlock.h>
-# include <linux/freezer.h>
+#include <linux/freezer.h>
+#include <linux/ftrace.h>
#include "async-thread.h"
#define WORK_QUEUED_BIT 0
struct btrfs_work *work;
do {
spin_lock_irq(&worker->lock);
+again_locked:
while (!list_empty(&worker->pending)) {
cur = worker->pending.next;
work = list_entry(cur, struct btrfs_work, list);
check_idle_worker(worker);
}
- worker->working = 0;
if (freezing(current)) {
+ worker->working = 0;
+ spin_unlock_irq(&worker->lock);
refrigerator();
} else {
- set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(&worker->lock);
- if (!kthread_should_stop())
+ if (!kthread_should_stop()) {
+ cpu_relax();
+ /*
+ * we've dropped the lock, did someone else
+ * jump_in?
+ */
+ smp_mb();
+ if (!list_empty(&worker->pending))
+ continue;
+
+ /*
+ * this short schedule allows more work to
+ * come in without the queue functions
+ * needing to go through wake_up_process()
+ *
+ * worker->working is still 1, so nobody
+ * is going to try and wake us up
+ */
+ schedule_timeout(1);
+ smp_mb();
+ if (!list_empty(&worker->pending))
+ continue;
+
+ /* still no more work?, sleep for real */
+ spin_lock_irq(&worker->lock);
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!list_empty(&worker->pending))
+ goto again_locked;
+
+ /*
+ * this makes sure we get a wakeup when someone
+ * adds something new to the queue
+ */
+ worker->working = 0;
+ spin_unlock_irq(&worker->lock);
+
schedule();
+ }
__set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());
{
struct btrfs_worker_thread *worker = work->worker;
unsigned long flags;
+ int wake = 0;
if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags))
goto out;
spin_lock_irqsave(&worker->lock, flags);
- atomic_inc(&worker->num_pending);
list_add_tail(&work->list, &worker->pending);
+ atomic_inc(&worker->num_pending);
/* by definition we're busy, take ourselves off the idle
* list
&worker->workers->worker_list);
spin_unlock_irqrestore(&worker->workers->lock, flags);
}
+ if (!worker->working) {
+ wake = 1;
+ worker->working = 1;
+ }
spin_unlock_irqrestore(&worker->lock, flags);
-
+ if (wake)
+ wake_up_process(worker->task);
out:
+
return 0;
}
}
spin_lock_irqsave(&worker->lock, flags);
+
+ list_add_tail(&work->list, &worker->pending);
atomic_inc(&worker->num_pending);
check_busy_worker(worker);
- list_add_tail(&work->list, &worker->pending);
/*
* avoid calling into wake_up_process if this thread has already
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/bit_spinlock.h>
-#include <linux/version.h>
#include <linux/pagevec.h>
#include "compat.h"
#include "ctree.h"
return path;
}
+/*
+ * set all locked nodes in the path to blocking locks. This should
+ * be done before scheduling
+ */
+noinline void btrfs_set_path_blocking(struct btrfs_path *p)
+{
+ int i;
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (p->nodes[i] && p->locks[i])
+ btrfs_set_lock_blocking(p->nodes[i]);
+ }
+}
+
+/*
+ * reset all the locked nodes in the patch to spinning locks.
+ */
+noinline void btrfs_clear_path_blocking(struct btrfs_path *p)
+{
+ int i;
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (p->nodes[i] && p->locks[i])
+ btrfs_clear_lock_blocking(p->nodes[i]);
+ }
+}
+
/* this also releases the path */
void btrfs_free_path(struct btrfs_path *p)
{
if (IS_ERR(cow))
return PTR_ERR(cow);
+ /* cow is set to blocking by btrfs_init_new_buffer */
+
copy_extent_buffer(cow, buf, 0, 0, cow->len);
btrfs_set_header_bytenr(cow, cow->start);
btrfs_set_header_generation(cow, trans->transid);
WARN_ON(1);
}
- spin_lock(&root->fs_info->hash_lock);
if (btrfs_header_generation(buf) == trans->transid &&
btrfs_header_owner(buf) == root->root_key.objectid &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
*cow_ret = buf;
- spin_unlock(&root->fs_info->hash_lock);
WARN_ON(prealloc_dest);
return 0;
}
- spin_unlock(&root->fs_info->hash_lock);
+
search_start = buf->start & ~((u64)(1024 * 1024 * 1024) - 1);
+
+ if (parent)
+ btrfs_set_lock_blocking(parent);
+ btrfs_set_lock_blocking(buf);
+
ret = __btrfs_cow_block(trans, root, buf, parent,
parent_slot, cow_ret, search_start, 0,
prealloc_dest);
if (parent_nritems == 1)
return 0;
+ btrfs_set_lock_blocking(parent);
+
for (i = start_slot; i < end_slot; i++) {
int close = 1;
search_start = last_block;
btrfs_tree_lock(cur);
+ btrfs_set_lock_blocking(cur);
err = __btrfs_cow_block(trans, root, cur, parent, i,
&cur, search_start,
min(16 * blocksize,
return 0;
mid = path->nodes[level];
+
WARN_ON(!path->locks[level]);
WARN_ON(btrfs_header_generation(mid) != trans->transid);
/* promote the child to a root */
child = read_node_slot(root, mid, 0);
btrfs_tree_lock(child);
+ btrfs_set_lock_blocking(child);
BUG_ON(!child);
ret = btrfs_cow_block(trans, root, child, mid, 0, &child, 0);
BUG_ON(ret);
add_root_to_dirty_list(root);
btrfs_tree_unlock(child);
+
path->locks[level] = 0;
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
left = read_node_slot(root, parent, pslot - 1);
if (left) {
btrfs_tree_lock(left);
+ btrfs_set_lock_blocking(left);
wret = btrfs_cow_block(trans, root, left,
parent, pslot - 1, &left, 0);
if (wret) {
right = read_node_slot(root, parent, pslot + 1);
if (right) {
btrfs_tree_lock(right);
+ btrfs_set_lock_blocking(right);
wret = btrfs_cow_block(trans, root, right,
parent, pslot + 1, &right, 0);
if (wret) {
u32 left_nr;
btrfs_tree_lock(left);
+ btrfs_set_lock_blocking(left);
+
left_nr = btrfs_header_nritems(left);
if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
wret = 1;
*/
if (right) {
u32 right_nr;
+
btrfs_tree_lock(right);
+ btrfs_set_lock_blocking(right);
+
right_nr = btrfs_header_nritems(right);
if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
wret = 1;
struct btrfs_disk_key disk_key;
u32 nritems;
u64 search;
- u64 lowest_read;
- u64 highest_read;
+ u64 target;
u64 nread = 0;
int direction = path->reada;
struct extent_buffer *eb;
return;
}
- highest_read = search;
- lowest_read = search;
+ target = search;
nritems = btrfs_header_nritems(node);
nr = slot;
break;
}
search = btrfs_node_blockptr(node, nr);
- if ((search >= lowest_read && search <= highest_read) ||
- (search < lowest_read && lowest_read - search <= 16384) ||
- (search > highest_read && search - highest_read <= 16384)) {
+ if ((search <= target && target - search <= 65536) ||
+ (search > target && search - target <= 65536)) {
readahead_tree_block(root, search, blocksize,
btrfs_node_ptr_generation(node, nr));
nread += blocksize;
}
nscan++;
- if (path->reada < 2 && (nread > (64 * 1024) || nscan > 32))
+ if ((nread > 65536 || nscan > 32))
break;
+ }
+}
- if (nread > (256 * 1024) || nscan > 128)
- break;
+/*
+ * returns -EAGAIN if it had to drop the path, or zero if everything was in
+ * cache
+ */
+static noinline int reada_for_balance(struct btrfs_root *root,
+ struct btrfs_path *path, int level)
+{
+ int slot;
+ int nritems;
+ struct extent_buffer *parent;
+ struct extent_buffer *eb;
+ u64 gen;
+ u64 block1 = 0;
+ u64 block2 = 0;
+ int ret = 0;
+ int blocksize;
- if (search < lowest_read)
- lowest_read = search;
- if (search > highest_read)
- highest_read = search;
+ parent = path->nodes[level - 1];
+ if (!parent)
+ return 0;
+
+ nritems = btrfs_header_nritems(parent);
+ slot = path->slots[level];
+ blocksize = btrfs_level_size(root, level);
+
+ if (slot > 0) {
+ block1 = btrfs_node_blockptr(parent, slot - 1);
+ gen = btrfs_node_ptr_generation(parent, slot - 1);
+ eb = btrfs_find_tree_block(root, block1, blocksize);
+ if (eb && btrfs_buffer_uptodate(eb, gen))
+ block1 = 0;
+ free_extent_buffer(eb);
+ }
+ if (slot < nritems) {
+ block2 = btrfs_node_blockptr(parent, slot + 1);
+ gen = btrfs_node_ptr_generation(parent, slot + 1);
+ eb = btrfs_find_tree_block(root, block2, blocksize);
+ if (eb && btrfs_buffer_uptodate(eb, gen))
+ block2 = 0;
+ free_extent_buffer(eb);
+ }
+ if (block1 || block2) {
+ ret = -EAGAIN;
+ btrfs_release_path(root, path);
+ if (block1)
+ readahead_tree_block(root, block1, blocksize, 0);
+ if (block2)
+ readahead_tree_block(root, block2, blocksize, 0);
+
+ if (block1) {
+ eb = read_tree_block(root, block1, blocksize, 0);
+ free_extent_buffer(eb);
+ }
+ if (block1) {
+ eb = read_tree_block(root, block2, blocksize, 0);
+ free_extent_buffer(eb);
+ }
}
+ return ret;
}
+
/*
* when we walk down the tree, it is usually safe to unlock the higher layers
* in the tree. The exceptions are when our path goes through slot 0, because
}
}
+/*
+ * This releases any locks held in the path starting at level and
+ * going all the way up to the root.
+ *
+ * btrfs_search_slot will keep the lock held on higher nodes in a few
+ * corner cases, such as COW of the block at slot zero in the node. This
+ * ignores those rules, and it should only be called when there are no
+ * more updates to be done higher up in the tree.
+ */
+noinline void btrfs_unlock_up_safe(struct btrfs_path *path, int level)
+{
+ int i;
+
+ if (path->keep_locks || path->lowest_level)
+ return;
+
+ for (i = level; i < BTRFS_MAX_LEVEL; i++) {
+ if (!path->nodes[i])
+ continue;
+ if (!path->locks[i])
+ continue;
+ btrfs_tree_unlock(path->nodes[i]);
+ path->locks[i] = 0;
+ }
+}
+
/*
* look for key in the tree. path is filled in with nodes along the way
* if key is found, we return zero and you can find the item in the leaf
int wret;
/* is a cow on this block not required */
- spin_lock(&root->fs_info->hash_lock);
if (btrfs_header_generation(b) == trans->transid &&
btrfs_header_owner(b) == root->root_key.objectid &&
!btrfs_header_flag(b, BTRFS_HEADER_FLAG_WRITTEN)) {
- spin_unlock(&root->fs_info->hash_lock);
goto cow_done;
}
- spin_unlock(&root->fs_info->hash_lock);
/* ok, we have to cow, is our old prealloc the right
* size?
*/
if (prealloc_block.objectid &&
prealloc_block.offset != b->len) {
+ btrfs_release_path(root, p);
btrfs_free_reserved_extent(root,
prealloc_block.objectid,
prealloc_block.offset);
prealloc_block.objectid = 0;
+ goto again;
}
/*
* for higher level blocks, try not to allocate blocks
* with the block and the parent locks held.
*/
- if (level > 1 && !prealloc_block.objectid &&
+ if (level > 0 && !prealloc_block.objectid &&
btrfs_path_lock_waiting(p, level)) {
u32 size = b->len;
u64 hint = b->start;
goto again;
}
+ btrfs_set_path_blocking(p);
+
wret = btrfs_cow_block(trans, root, b,
p->nodes[level + 1],
p->slots[level + 1],
if (!p->skip_locking)
p->locks[level] = 1;
+ btrfs_clear_path_blocking(p);
+
+ /*
+ * we have a lock on b and as long as we aren't changing
+ * the tree, there is no way to for the items in b to change.
+ * It is safe to drop the lock on our parent before we
+ * go through the expensive btree search on b.
+ *
+ * If cow is true, then we might be changing slot zero,
+ * which may require changing the parent. So, we can't
+ * drop the lock until after we know which slot we're
+ * operating on.
+ */
+ if (!cow)
+ btrfs_unlock_up_safe(p, level + 1);
+
ret = check_block(root, p, level);
if (ret) {
ret = -1;
}
ret = bin_search(b, key, level, &slot);
+
if (level != 0) {
if (ret && slot > 0)
slot -= 1;
if ((p->search_for_split || ins_len > 0) &&
btrfs_header_nritems(b) >=
BTRFS_NODEPTRS_PER_BLOCK(root) - 3) {
- int sret = split_node(trans, root, p, level);
+ int sret;
+
+ sret = reada_for_balance(root, p, level);
+ if (sret)
+ goto again;
+
+ btrfs_set_path_blocking(p);
+ sret = split_node(trans, root, p, level);
+ btrfs_clear_path_blocking(p);
+
BUG_ON(sret > 0);
if (sret) {
ret = sret;
}
b = p->nodes[level];
slot = p->slots[level];
- } else if (ins_len < 0) {
- int sret = balance_level(trans, root, p,
- level);
+ } else if (ins_len < 0 &&
+ btrfs_header_nritems(b) <
+ BTRFS_NODEPTRS_PER_BLOCK(root) / 4) {
+ int sret;
+
+ sret = reada_for_balance(root, p, level);
+ if (sret)
+ goto again;
+
+ btrfs_set_path_blocking(p);
+ sret = balance_level(trans, root, p, level);
+ btrfs_clear_path_blocking(p);
+
if (sret) {
ret = sret;
goto done;
* of the btree by dropping locks before
* we read.
*/
- if (level > 1) {
+ if (level > 0) {
btrfs_release_path(NULL, p);
if (tmp)
free_extent_buffer(tmp);
free_extent_buffer(tmp);
goto again;
} else {
+ btrfs_set_path_blocking(p);
if (tmp)
free_extent_buffer(tmp);
if (should_reada)
b = read_node_slot(root, b, slot);
}
}
- if (!p->skip_locking)
- btrfs_tree_lock(b);
+ if (!p->skip_locking) {
+ int lret;
+
+ btrfs_clear_path_blocking(p);
+ lret = btrfs_try_spin_lock(b);
+
+ if (!lret) {
+ btrfs_set_path_blocking(p);
+ btrfs_tree_lock(b);
+ btrfs_clear_path_blocking(p);
+ }
+ }
} else {
p->slots[level] = slot;
if (ins_len > 0 &&
btrfs_leaf_free_space(root, b) < ins_len) {
- int sret = split_leaf(trans, root, key,
+ int sret;
+
+ btrfs_set_path_blocking(p);
+ sret = split_leaf(trans, root, key,
p, ins_len, ret == 0);
+ btrfs_clear_path_blocking(p);
+
BUG_ON(sret > 0);
if (sret) {
ret = sret;
}
ret = 1;
done:
+ /*
+ * we don't really know what they plan on doing with the path
+ * from here on, so for now just mark it as blocking
+ */
+ btrfs_set_path_blocking(p);
if (prealloc_block.objectid) {
btrfs_free_reserved_extent(root,
prealloc_block.objectid,
prealloc_block.offset);
}
-
return ret;
}
ret = btrfs_cow_block(trans, root, eb, NULL, 0, &eb, 0);
BUG_ON(ret);
+ btrfs_set_lock_blocking(eb);
+
parent = eb;
while (1) {
level = btrfs_header_level(parent);
eb = read_tree_block(root, bytenr, blocksize,
generation);
btrfs_tree_lock(eb);
+ btrfs_set_lock_blocking(eb);
}
/*
eb = read_tree_block(root, bytenr, blocksize,
generation);
btrfs_tree_lock(eb);
+ btrfs_set_lock_blocking(eb);
}
ret = btrfs_cow_block(trans, root, eb, parent, slot,
right = read_node_slot(root, upper, slot + 1);
btrfs_tree_lock(right);
+ btrfs_set_lock_blocking(right);
+
free_space = btrfs_leaf_free_space(root, right);
if (free_space < data_size)
goto out_unlock;
left = read_node_slot(root, path->nodes[1], slot - 1);
btrfs_tree_lock(left);
+ btrfs_set_lock_blocking(left);
+
free_space = btrfs_leaf_free_space(root, left);
if (free_space < data_size) {
ret = 1;
path->keep_locks = 0;
BUG_ON(ret);
+ /*
+ * make sure any changes to the path from split_leaf leave it
+ * in a blocking state
+ */
+ btrfs_set_path_blocking(path);
+
leaf = path->nodes[0];
BUG_ON(btrfs_leaf_free_space(root, leaf) < sizeof(struct btrfs_item));
BUG();
}
out:
+ btrfs_unlock_up_safe(path, 1);
return ret;
}
{
int ret;
u64 root_gen = btrfs_header_generation(path->nodes[1]);
+ u64 parent_start = path->nodes[1]->start;
+ u64 parent_owner = btrfs_header_owner(path->nodes[1]);
ret = del_ptr(trans, root, path, 1, path->slots[1]);
if (ret)
return ret;
+ /*
+ * btrfs_free_extent is expensive, we want to make sure we
+ * aren't holding any locks when we call it
+ */
+ btrfs_unlock_up_safe(path, 0);
+
ret = btrfs_free_extent(trans, root, bytenr,
btrfs_level_size(root, 0),
- path->nodes[1]->start,
- btrfs_header_owner(path->nodes[1]),
+ parent_start, parent_owner,
root_gen, 0, 1);
return ret;
}
*/
if (slot >= nritems) {
path->slots[level] = slot;
+ btrfs_set_path_blocking(path);
sret = btrfs_find_next_key(root, path, min_key, level,
cache_only, min_trans);
if (sret == 0) {
btrfs_release_path(root, path);
goto again;
} else {
+ btrfs_clear_path_blocking(path);
goto out;
}
}
unlock_up(path, level, 1);
goto out;
}
+ btrfs_set_path_blocking(path);
cur = read_node_slot(root, cur, slot);
btrfs_tree_lock(cur);
+
path->locks[level - 1] = 1;
path->nodes[level - 1] = cur;
unlock_up(path, level, 1);
+ btrfs_clear_path_blocking(path);
}
out:
if (ret == 0)
memcpy(min_key, &found_key, sizeof(found_key));
+ btrfs_set_path_blocking(path);
return ret;
}
if (ret < 0)
return ret;
+ btrfs_set_path_blocking(path);
nritems = btrfs_header_nritems(path->nodes[0]);
/*
* by releasing the path above we dropped all our locks. A balance
free_extent_buffer(next);
}
+ /* the path was set to blocking above */
if (level == 1 && (path->locks[1] || path->skip_locking) &&
path->reada)
reada_for_search(root, path, level, slot, 0);
if (!path->skip_locking) {
WARN_ON(!btrfs_tree_locked(c));
btrfs_tree_lock(next);
+ btrfs_set_lock_blocking(next);
}
break;
}
path->locks[level] = 1;
if (!level)
break;
+
+ btrfs_set_path_blocking(path);
if (level == 1 && path->locks[1] && path->reada)
reada_for_search(root, path, level, slot, 0);
next = read_node_slot(root, next, 0);
if (!path->skip_locking) {
WARN_ON(!btrfs_tree_locked(path->nodes[level]));
btrfs_tree_lock(next);
+ btrfs_set_lock_blocking(next);
}
}
done:
while (1) {
if (path->slots[0] == 0) {
+ btrfs_set_path_blocking(path);
ret = btrfs_prev_leaf(root, path);
if (ret != 0)
return ret;
__le32 nsec;
} __attribute__ ((__packed__));
-typedef enum {
+enum btrfs_compression_type {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LAST = 2,
-} btrfs_compression_type;
-
-/* we don't understand any encryption methods right now */
-typedef enum {
- BTRFS_ENCRYPTION_NONE = 0,
- BTRFS_ENCRYPTION_LAST = 1,
-} btrfs_encryption_type;
+};
struct btrfs_inode_item {
/* nfs style generation number */
struct btrfs_transaction *running_transaction;
wait_queue_head_t transaction_throttle;
wait_queue_head_t transaction_wait;
-
wait_queue_head_t async_submit_wait;
- wait_queue_head_t tree_log_wait;
struct btrfs_super_block super_copy;
struct btrfs_super_block super_for_commit;
struct super_block *sb;
struct inode *btree_inode;
struct backing_dev_info bdi;
- spinlock_t hash_lock;
struct mutex trans_mutex;
struct mutex tree_log_mutex;
struct mutex transaction_kthread_mutex;
atomic_t async_submit_draining;
atomic_t nr_async_bios;
atomic_t async_delalloc_pages;
- atomic_t tree_log_writers;
- atomic_t tree_log_commit;
- unsigned long tree_log_batch;
- u64 tree_log_transid;
/*
* this is used by the balancing code to wait for all the pending
struct kobject root_kobj;
struct completion kobj_unregister;
struct mutex objectid_mutex;
+
struct mutex log_mutex;
+ wait_queue_head_t log_writer_wait;
+ wait_queue_head_t log_commit_wait[2];
+ atomic_t log_writers;
+ atomic_t log_commit[2];
+ unsigned long log_transid;
+ unsigned long log_batch;
u64 objectid;
u64 last_trans;
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
void btrfs_init_path(struct btrfs_path *p);
+void btrfs_set_path_blocking(struct btrfs_path *p);
+void btrfs_clear_path_blocking(struct btrfs_path *p);
+void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
+
int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int slot, int nr);
int btrfs_del_leaf(struct btrfs_trans_handle *trans,
* Boston, MA 021110-1307, USA.
*/
-#include <linux/version.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
if (ret == 0)
- buf->flags |= EXTENT_UPTODATE;
+ set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
else
WARN_ON(1);
return buf;
if (btrfs_header_generation(buf) ==
root->fs_info->running_transaction->transid) {
WARN_ON(!btrfs_tree_locked(buf));
+
+ /* ugh, clear_extent_buffer_dirty can be expensive */
+ btrfs_set_lock_blocking(buf);
+
clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
buf);
}
spin_lock_init(&root->list_lock);
mutex_init(&root->objectid_mutex);
mutex_init(&root->log_mutex);
+ init_waitqueue_head(&root->log_writer_wait);
+ init_waitqueue_head(&root->log_commit_wait[0]);
+ init_waitqueue_head(&root->log_commit_wait[1]);
+ atomic_set(&root->log_commit[0], 0);
+ atomic_set(&root->log_commit[1], 0);
+ atomic_set(&root->log_writers, 0);
+ root->log_batch = 0;
+ root->log_transid = 0;
extent_io_tree_init(&root->dirty_log_pages,
fs_info->btree_inode->i_mapping, GFP_NOFS);
return 0;
}
-int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info)
+static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root;
struct btrfs_root *tree_root = fs_info->tree_root;
+ struct extent_buffer *leaf;
root = kzalloc(sizeof(*root), GFP_NOFS);
if (!root)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
__setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
+ /*
+ * log trees do not get reference counted because they go away
+ * before a real commit is actually done. They do store pointers
+ * to file data extents, and those reference counts still get
+ * updated (along with back refs to the log tree).
+ */
root->ref_cows = 0;
- root->node = btrfs_alloc_free_block(trans, root, root->leafsize,
- 0, BTRFS_TREE_LOG_OBJECTID,
- trans->transid, 0, 0, 0);
+ leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
+ 0, BTRFS_TREE_LOG_OBJECTID,
+ trans->transid, 0, 0, 0);
+ if (IS_ERR(leaf)) {
+ kfree(root);
+ return ERR_CAST(leaf);
+ }
+ root->node = leaf;
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
btrfs_set_header_bytenr(root->node, root->node->start);
BTRFS_FSID_SIZE);
btrfs_mark_buffer_dirty(root->node);
btrfs_tree_unlock(root->node);
- fs_info->log_root_tree = root;
+ return root;
+}
+
+int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *log_root;
+
+ log_root = alloc_log_tree(trans, fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+ WARN_ON(fs_info->log_root_tree);
+ fs_info->log_root_tree = log_root;
+ return 0;
+}
+
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_root *log_root;
+ struct btrfs_inode_item *inode_item;
+
+ log_root = alloc_log_tree(trans, root->fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+
+ log_root->last_trans = trans->transid;
+ log_root->root_key.offset = root->root_key.objectid;
+
+ inode_item = &log_root->root_item.inode;
+ inode_item->generation = cpu_to_le64(1);
+ inode_item->size = cpu_to_le64(3);
+ inode_item->nlink = cpu_to_le32(1);
+ inode_item->nbytes = cpu_to_le64(root->leafsize);
+ inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
+
+ btrfs_set_root_bytenr(&log_root->root_item, log_root->node->start);
+ btrfs_set_root_generation(&log_root->root_item, trans->transid);
+
+ WARN_ON(root->log_root);
+ root->log_root = log_root;
+ root->log_transid = 0;
return 0;
}
{
struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
int ret = 0;
- struct list_head *cur;
struct btrfs_device *device;
struct backing_dev_info *bdi;
#if 0
btrfs_congested_async(info, 0))
return 1;
#endif
- list_for_each(cur, &info->fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
bdi = blk_get_backing_dev_info(device->bdev);
*/
static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
- struct list_head *cur;
struct btrfs_device *device;
struct btrfs_fs_info *info;
info = (struct btrfs_fs_info *)bdi->unplug_io_data;
- list_for_each(cur, &info->fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
INIT_LIST_HEAD(&fs_info->dead_roots);
INIT_LIST_HEAD(&fs_info->hashers);
INIT_LIST_HEAD(&fs_info->delalloc_inodes);
- spin_lock_init(&fs_info->hash_lock);
spin_lock_init(&fs_info->delalloc_lock);
spin_lock_init(&fs_info->new_trans_lock);
spin_lock_init(&fs_info->ref_cache_lock);
init_waitqueue_head(&fs_info->transaction_throttle);
init_waitqueue_head(&fs_info->transaction_wait);
init_waitqueue_head(&fs_info->async_submit_wait);
- init_waitqueue_head(&fs_info->tree_log_wait);
- atomic_set(&fs_info->tree_log_commit, 0);
- atomic_set(&fs_info->tree_log_writers, 0);
- fs_info->tree_log_transid = 0;
__setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
* low idle thresh
*/
fs_info->endio_workers.idle_thresh = 4;
+ fs_info->endio_meta_workers.idle_thresh = 4;
+
fs_info->endio_write_workers.idle_thresh = 64;
fs_info->endio_meta_write_workers.idle_thresh = 64;
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
"btrfs-cleaner");
- if (!fs_info->cleaner_kthread)
+ if (IS_ERR(fs_info->cleaner_kthread))
goto fail_csum_root;
fs_info->transaction_kthread = kthread_run(transaction_kthread,
tree_root,
"btrfs-transaction");
- if (!fs_info->transaction_kthread)
+ if (IS_ERR(fs_info->transaction_kthread))
goto fail_cleaner;
if (btrfs_super_log_root(disk_super) != 0) {
fail_iput:
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
iput(fs_info->btree_inode);
-fail:
+
btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
+ bdi_destroy(&fs_info->bdi);
+fail:
kfree(extent_root);
kfree(tree_root);
- bdi_destroy(&fs_info->bdi);
kfree(fs_info);
kfree(chunk_root);
kfree(dev_root);
int write_all_supers(struct btrfs_root *root, int max_mirrors)
{
- struct list_head *cur;
struct list_head *head = &root->fs_info->fs_devices->devices;
struct btrfs_device *dev;
struct btrfs_super_block *sb;
sb = &root->fs_info->super_for_commit;
dev_item = &sb->dev_item;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (!dev->bdev) {
total_errors++;
continue;
}
total_errors = 0;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (!dev->bdev)
continue;
if (!dev->in_fs_metadata || !dev->writeable)
u64 transid = btrfs_header_generation(buf);
struct inode *btree_inode = root->fs_info->btree_inode;
+ btrfs_set_lock_blocking(buf);
+
WARN_ON(!btrfs_tree_locked(buf));
if (transid != root->fs_info->generation) {
printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
int ret;
ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
if (ret == 0)
- buf->flags |= EXTENT_UPTODATE;
+ set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
return ret;
}
int btree_lock_page_hook(struct page *page)
{
struct inode *inode = page->mapping->host;
- struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_buffer *eb;
unsigned long len;
goto out;
btrfs_tree_lock(eb);
- spin_lock(&root->fs_info->hash_lock);
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
- spin_unlock(&root->fs_info->hash_lock);
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
out:
struct btrfs_fs_info *fs_info);
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
int btree_lock_page_hook(struct page *page);
#endif
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
-#include <linux/version.h>
+#include <linux/sort.h>
#include "compat.h"
#include "hash.h"
#include "crc32c.h"
#include "volumes.h"
#include "locking.h"
#include "ref-cache.h"
-#include "compat.h"
#define PENDING_EXTENT_INSERT 0
#define PENDING_EXTENT_DELETE 1
u64 flags)
{
struct list_head *head = &info->space_info;
- struct list_head *cur;
struct btrfs_space_info *found;
- list_for_each(cur, head) {
- found = list_entry(cur, struct btrfs_space_info, list);
+ list_for_each_entry(found, head, list) {
if (found->flags == flags)
return found;
}
return ret;
}
-int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *orig_buf, struct extent_buffer *buf,
- u32 *nr_extents)
+/* when a block goes through cow, we update the reference counts of
+ * everything that block points to. The internal pointers of the block
+ * can be in just about any order, and it is likely to have clusters of
+ * things that are close together and clusters of things that are not.
+ *
+ * To help reduce the seeks that come with updating all of these reference
+ * counts, sort them by byte number before actual updates are done.
+ *
+ * struct refsort is used to match byte number to slot in the btree block.
+ * we sort based on the byte number and then use the slot to actually
+ * find the item.
+ *
+ * struct refsort is smaller than strcut btrfs_item and smaller than
+ * struct btrfs_key_ptr. Since we're currently limited to the page size
+ * for a btree block, there's no way for a kmalloc of refsorts for a
+ * single node to be bigger than a page.
+ */
+struct refsort {
+ u64 bytenr;
+ u32 slot;
+};
+
+/*
+ * for passing into sort()
+ */
+static int refsort_cmp(const void *a_void, const void *b_void)
+{
+ const struct refsort *a = a_void;
+ const struct refsort *b = b_void;
+
+ if (a->bytenr < b->bytenr)
+ return -1;
+ if (a->bytenr > b->bytenr)
+ return 1;
+ return 0;
+}
+
+
+noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *orig_buf,
+ struct extent_buffer *buf, u32 *nr_extents)
{
u64 bytenr;
u64 ref_root;
u64 orig_root;
u64 ref_generation;
u64 orig_generation;
+ struct refsort *sorted;
u32 nritems;
u32 nr_file_extents = 0;
struct btrfs_key key;
int level;
int ret = 0;
int faili = 0;
+ int refi = 0;
+ int slot;
int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
u64, u64, u64, u64, u64, u64, u64, u64);
nritems = btrfs_header_nritems(buf);
level = btrfs_header_level(buf);
+ sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS);
+ BUG_ON(!sorted);
+
if (root->ref_cows) {
process_func = __btrfs_inc_extent_ref;
} else {
process_func = __btrfs_update_extent_ref;
}
+ /*
+ * we make two passes through the items. In the first pass we
+ * only record the byte number and slot. Then we sort based on
+ * byte number and do the actual work based on the sorted results
+ */
for (i = 0; i < nritems; i++) {
cond_resched();
if (level == 0) {
continue;
nr_file_extents++;
+ sorted[refi].bytenr = bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ } else {
+ bytenr = btrfs_node_blockptr(buf, i);
+ sorted[refi].bytenr = bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ }
+ }
+ /*
+ * if refi == 0, we didn't actually put anything into the sorted
+ * array and we're done
+ */
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ for (i = 0; i < refi; i++) {
+ cond_resched();
+ slot = sorted[i].slot;
+ bytenr = sorted[i].bytenr;
+
+ if (level == 0) {
+ btrfs_item_key_to_cpu(buf, &key, slot);
ret = process_func(trans, root, bytenr,
orig_buf->start, buf->start,
key.objectid);
if (ret) {
- faili = i;
+ faili = slot;
WARN_ON(1);
goto fail;
}
} else {
- bytenr = btrfs_node_blockptr(buf, i);
ret = process_func(trans, root, bytenr,
orig_buf->start, buf->start,
orig_root, ref_root,
orig_generation, ref_generation,
level - 1);
if (ret) {
- faili = i;
+ faili = slot;
WARN_ON(1);
goto fail;
}
}
}
out:
+ kfree(sorted);
if (nr_extents) {
if (level == 0)
*nr_extents = nr_file_extents;
}
return 0;
fail:
+ kfree(sorted);
WARN_ON(1);
return ret;
}
ret = find_first_extent_bit(&info->extent_ins, search, &start,
&end, EXTENT_WRITEBACK);
if (ret) {
- if (skipped && all && !num_inserts) {
+ if (skipped && all && !num_inserts &&
+ list_empty(&update_list)) {
skipped = 0;
search = 0;
continue;
if (ret) {
if (all && skipped && !nr) {
search = 0;
+ skipped = 0;
continue;
}
mutex_unlock(&info->extent_ins_mutex);
/* if metadata always pin */
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
- struct btrfs_block_group_cache *cache;
-
- /* btrfs_free_reserved_extent */
- cache = btrfs_lookup_block_group(root->fs_info, bytenr);
- BUG_ON(!cache);
- btrfs_add_free_space(cache, bytenr, num_bytes);
- put_block_group(cache);
+ mutex_lock(&root->fs_info->pinned_mutex);
+ btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
+ mutex_unlock(&root->fs_info->pinned_mutex);
update_reserved_extents(root, bytenr, num_bytes, 0);
return 0;
}
static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
{
struct btrfs_block_group_cache *cache;
- struct list_head *l;
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
(unsigned long long)(info->total_bytes - info->bytes_used -
(info->full) ? "" : "not ");
down_read(&info->groups_sem);
- list_for_each(l, &info->block_groups) {
- cache = list_entry(l, struct btrfs_block_group_cache, list);
+ list_for_each_entry(cache, &info->block_groups, list) {
spin_lock(&cache->lock);
printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
"%llu pinned %llu reserved\n",
btrfs_set_header_generation(buf, trans->transid);
btrfs_tree_lock(buf);
clean_tree_block(trans, root, buf);
+
+ btrfs_set_lock_blocking(buf);
btrfs_set_buffer_uptodate(buf);
+
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
set_extent_dirty(&root->dirty_log_pages, buf->start,
buf->start + buf->len - 1, GFP_NOFS);
buf->start + buf->len - 1, GFP_NOFS);
}
trans->blocks_used++;
+ /* this returns a buffer locked for blocking */
return buf;
}
{
u64 leaf_owner;
u64 leaf_generation;
+ struct refsort *sorted;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
int nritems;
int ret;
+ int refi = 0;
+ int slot;
BUG_ON(!btrfs_is_leaf(leaf));
nritems = btrfs_header_nritems(leaf);
leaf_owner = btrfs_header_owner(leaf);
leaf_generation = btrfs_header_generation(leaf);
+ sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
+ /* we do this loop twice. The first time we build a list
+ * of the extents we have a reference on, then we sort the list
+ * by bytenr. The second time around we actually do the
+ * extent freeing.
+ */
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
cond_resched();
btrfs_item_key_to_cpu(leaf, &key, i);
+
+ /* only extents have references, skip everything else */
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
+
fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
+
+ /* inline extents live in the btree, they don't have refs */
if (btrfs_file_extent_type(leaf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- /*
- * FIXME make sure to insert a trans record that
- * repeats the snapshot del on crash
- */
+
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+
+ /* holes don't have refs */
if (disk_bytenr == 0)
continue;
+ sorted[refi].bytenr = disk_bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ }
+
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ for (i = 0; i < refi; i++) {
+ u64 disk_bytenr;
+
+ disk_bytenr = sorted[i].bytenr;
+ slot = sorted[i].slot;
+
+ cond_resched();
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+
ret = __btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi),
leaf->start, leaf_owner, leaf_generation,
wake_up(&root->fs_info->transaction_throttle);
cond_resched();
}
+out:
+ kfree(sorted);
return 0;
}
{
int i;
int ret;
- struct btrfs_extent_info *info = ref->extents;
+ struct btrfs_extent_info *info;
+ struct refsort *sorted;
+
+ if (ref->nritems == 0)
+ return 0;
+ sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS);
for (i = 0; i < ref->nritems; i++) {
+ sorted[i].bytenr = ref->extents[i].bytenr;
+ sorted[i].slot = i;
+ }
+ sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL);
+
+ /*
+ * the items in the ref were sorted when the ref was inserted
+ * into the ref cache, so this is already in order
+ */
+ for (i = 0; i < ref->nritems; i++) {
+ info = ref->extents + sorted[i].slot;
ret = __btrfs_free_extent(trans, root, info->bytenr,
info->num_bytes, ref->bytenr,
ref->owner, ref->generation,
info++;
}
+ kfree(sorted);
return 0;
}
return ret;
}
+/*
+ * this is used while deleting old snapshots, and it drops the refs
+ * on a whole subtree starting from a level 1 node.
+ *
+ * The idea is to sort all the leaf pointers, and then drop the
+ * ref on all the leaves in order. Most of the time the leaves
+ * will have ref cache entries, so no leaf IOs will be required to
+ * find the extents they have references on.
+ *
+ * For each leaf, any references it has are also dropped in order
+ *
+ * This ends up dropping the references in something close to optimal
+ * order for reading and modifying the extent allocation tree.
+ */
+static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ u64 bytenr;
+ u64 root_owner;
+ u64 root_gen;
+ struct extent_buffer *eb = path->nodes[1];
+ struct extent_buffer *leaf;
+ struct btrfs_leaf_ref *ref;
+ struct refsort *sorted = NULL;
+ int nritems = btrfs_header_nritems(eb);
+ int ret;
+ int i;
+ int refi = 0;
+ int slot = path->slots[1];
+ u32 blocksize = btrfs_level_size(root, 0);
+ u32 refs;
+
+ if (nritems == 0)
+ goto out;
+
+ root_owner = btrfs_header_owner(eb);
+ root_gen = btrfs_header_generation(eb);
+ sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
+
+ /*
+ * step one, sort all the leaf pointers so we don't scribble
+ * randomly into the extent allocation tree
+ */
+ for (i = slot; i < nritems; i++) {
+ sorted[refi].bytenr = btrfs_node_blockptr(eb, i);
+ sorted[refi].slot = i;
+ refi++;
+ }
+
+ /*
+ * nritems won't be zero, but if we're picking up drop_snapshot
+ * after a crash, slot might be > 0, so double check things
+ * just in case.
+ */
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ /*
+ * the first loop frees everything the leaves point to
+ */
+ for (i = 0; i < refi; i++) {
+ u64 ptr_gen;
+
+ bytenr = sorted[i].bytenr;
+
+ /*
+ * check the reference count on this leaf. If it is > 1
+ * we just decrement it below and don't update any
+ * of the refs the leaf points to.
+ */
+ ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
+ BUG_ON(ret);
+ if (refs != 1)
+ continue;
+
+ ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot);
+
+ /*
+ * the leaf only had one reference, which means the
+ * only thing pointing to this leaf is the snapshot
+ * we're deleting. It isn't possible for the reference
+ * count to increase again later
+ *
+ * The reference cache is checked for the leaf,
+ * and if found we'll be able to drop any refs held by
+ * the leaf without needing to read it in.
+ */
+ ref = btrfs_lookup_leaf_ref(root, bytenr);
+ if (ref && ref->generation != ptr_gen) {
+ btrfs_free_leaf_ref(root, ref);
+ ref = NULL;
+ }
+ if (ref) {
+ ret = cache_drop_leaf_ref(trans, root, ref);
+ BUG_ON(ret);
+ btrfs_remove_leaf_ref(root, ref);
+ btrfs_free_leaf_ref(root, ref);
+ } else {
+ /*
+ * the leaf wasn't in the reference cache, so
+ * we have to read it.
+ */
+ leaf = read_tree_block(root, bytenr, blocksize,
+ ptr_gen);
+ ret = btrfs_drop_leaf_ref(trans, root, leaf);
+ BUG_ON(ret);
+ free_extent_buffer(leaf);
+ }
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+ }
+
+ /*
+ * run through the loop again to free the refs on the leaves.
+ * This is faster than doing it in the loop above because
+ * the leaves are likely to be clustered together. We end up
+ * working in nice chunks on the extent allocation tree.
+ */
+ for (i = 0; i < refi; i++) {
+ bytenr = sorted[i].bytenr;
+ ret = __btrfs_free_extent(trans, root, bytenr,
+ blocksize, eb->start,
+ root_owner, root_gen, 0, 1);
+ BUG_ON(ret);
+
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+ }
+out:
+ kfree(sorted);
+
+ /*
+ * update the path to show we've processed the entire level 1
+ * node. This will get saved into the root's drop_snapshot_progress
+ * field so these drops are not repeated again if this transaction
+ * commits.
+ */
+ path->slots[1] = nritems;
+ return 0;
+}
+
/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
struct extent_buffer *next;
struct extent_buffer *cur;
struct extent_buffer *parent;
- struct btrfs_leaf_ref *ref;
u32 blocksize;
int ret;
u32 refs;
if (path->slots[*level] >=
btrfs_header_nritems(cur))
break;
+
+ /* the new code goes down to level 1 and does all the
+ * leaves pointed to that node in bulk. So, this check
+ * for level 0 will always be false.
+ *
+ * But, the disk format allows the drop_snapshot_progress
+ * field in the root to leave things in a state where
+ * a leaf will need cleaning up here. If someone crashes
+ * with the old code and then boots with the new code,
+ * we might find a leaf here.
+ */
if (*level == 0) {
ret = btrfs_drop_leaf_ref(trans, root, cur);
BUG_ON(ret);
break;
}
+
+ /*
+ * once we get to level one, process the whole node
+ * at once, including everything below it.
+ */
+ if (*level == 1) {
+ ret = drop_level_one_refs(trans, root, path);
+ BUG_ON(ret);
+ break;
+ }
+
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
blocksize = btrfs_level_size(root, *level - 1);
ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
BUG_ON(ret);
+
+ /*
+ * if there is more than one reference, we don't need
+ * to read that node to drop any references it has. We
+ * just drop the ref we hold on that node and move on to the
+ * next slot in this level.
+ */
if (refs != 1) {
parent = path->nodes[*level];
root_owner = btrfs_header_owner(parent);
continue;
}
+
/*
- * at this point, we have a single ref, and since the
- * only place referencing this extent is a dead root
- * the reference count should never go higher.
- * So, we don't need to check it again
+ * we need to keep freeing things in the next level down.
+ * read the block and loop around to process it
*/
- if (*level == 1) {
- ref = btrfs_lookup_leaf_ref(root, bytenr);
- if (ref && ref->generation != ptr_gen) {
- btrfs_free_leaf_ref(root, ref);
- ref = NULL;
- }
- if (ref) {
- ret = cache_drop_leaf_ref(trans, root, ref);
- BUG_ON(ret);
- btrfs_remove_leaf_ref(root, ref);
- btrfs_free_leaf_ref(root, ref);
- *level = 0;
- break;
- }
- }
- next = btrfs_find_tree_block(root, bytenr, blocksize);
- if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
- free_extent_buffer(next);
-
- next = read_tree_block(root, bytenr, blocksize,
- ptr_gen);
- cond_resched();
-#if 0
- /*
- * this is a debugging check and can go away
- * the ref should never go all the way down to 1
- * at this point
- */
- ret = lookup_extent_ref(NULL, root, bytenr, blocksize,
- &refs);
- BUG_ON(ret);
- WARN_ON(refs != 1);
-#endif
- }
+ next = read_tree_block(root, bytenr, blocksize, ptr_gen);
WARN_ON(*level <= 0);
if (path->nodes[*level-1])
free_extent_buffer(path->nodes[*level-1]);
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
+ /*
+ * cleanup and free the reference on the last node
+ * we processed
+ */
ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
parent->start, root_owner, root_gen,
*level, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
+
*level += 1;
BUG_ON(ret);
next = read_tree_block(root, bytenr, blocksize, ptr_gen);
btrfs_tree_lock(next);
+ btrfs_set_lock_blocking(next);
ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize,
&refs);
if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
struct extent_buffer *node;
struct btrfs_disk_key disk_key;
+
+ /*
+ * there is more work to do in this level.
+ * Update the drop_progress marker to reflect
+ * the work we've done so far, and then bump
+ * the slot number
+ */
node = path->nodes[i];
path->slots[i]++;
*level = i;
return 0;
} else {
struct extent_buffer *parent;
+
+ /*
+ * this whole node is done, free our reference
+ * on it and go up one level
+ */
if (path->nodes[*level] == root->node)
parent = path->nodes[*level];
else
u64 lock_end = 0;
u64 num_bytes;
u64 ext_offset;
- u64 first_pos;
+ u64 search_end = (u64)-1;
u32 nritems;
int nr_scaned = 0;
int extent_locked = 0;
int ret;
memcpy(&key, leaf_key, sizeof(key));
- first_pos = INT_LIMIT(loff_t) - extent_key->offset;
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
if (key.objectid < ref_path->owner_objectid ||
(key.objectid == ref_path->owner_objectid &&
if ((key.objectid > ref_path->owner_objectid) ||
(key.objectid == ref_path->owner_objectid &&
key.type > BTRFS_EXTENT_DATA_KEY) ||
- (key.offset >= first_pos + extent_key->offset))
+ key.offset >= search_end)
break;
}
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
ext_offset = btrfs_file_extent_offset(leaf, fi);
- if (first_pos > key.offset - ext_offset)
- first_pos = key.offset - ext_offset;
+ if (search_end == (u64)-1) {
+ search_end = key.offset - ext_offset +
+ btrfs_file_extent_ram_bytes(leaf, fi);
+ }
if (!extent_locked) {
lock_start = key.offset;
}
skip:
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS &&
- key.offset >= first_pos + extent_key->offset)
+ key.offset >= search_end)
break;
cond_resched();
ref->bytenr = buf->start;
ref->owner = btrfs_header_owner(buf);
ref->generation = btrfs_header_generation(buf);
+
ret = btrfs_add_leaf_ref(root, ref, 0);
WARN_ON(ret);
btrfs_free_leaf_ref(root, ref);
path = btrfs_alloc_path();
BUG_ON(!path);
- btrfs_remove_free_space_cache(block_group);
+ spin_lock(&root->fs_info->block_group_cache_lock);
rb_erase(&block_group->cache_node,
&root->fs_info->block_group_cache_tree);
+ spin_unlock(&root->fs_info->block_group_cache_lock);
+ btrfs_remove_free_space_cache(block_group);
down_write(&block_group->space_info->groups_sem);
list_del(&block_group->list);
up_write(&block_group->space_info->groups_sem);
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/swap.h>
-#include <linux/version.h>
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include "extent_io.h"
static LIST_HEAD(states);
#define LEAK_DEBUG 0
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
static DEFINE_SPINLOCK(leak_lock);
#endif
static struct extent_state *alloc_extent_state(gfp_t mask)
{
struct extent_state *state;
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
unsigned long flags;
#endif
state->state = 0;
state->private = 0;
state->tree = NULL;
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_add(&state->leak_list, &states);
spin_unlock_irqrestore(&leak_lock, flags);
if (!state)
return;
if (atomic_dec_and_test(&state->refs)) {
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
unsigned long flags;
#endif
WARN_ON(state->tree);
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_del(&state->leak_list);
spin_unlock_irqrestore(&leak_lock, flags);
int scanned = 0;
int range_whole = 0;
- if (wbc->nonblocking && bdi_write_congested(bdi)) {
- wbc->encountered_congestion = 1;
- return 0;
- }
-
pagevec_init(&pvec, 0);
if (wbc->range_cyclic) {
index = mapping->writeback_index; /* Start from prev offset */
return sector;
}
+int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len, get_extent_t *get_extent)
+{
+ int ret;
+ u64 off = start;
+ u64 max = start + len;
+ u32 flags = 0;
+ u64 disko = 0;
+ struct extent_map *em = NULL;
+ int end = 0;
+ u64 em_start = 0, em_len = 0;
+ unsigned long emflags;
+ ret = 0;
+
+ if (len == 0)
+ return -EINVAL;
+
+ lock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
+ GFP_NOFS);
+ em = get_extent(inode, NULL, 0, off, max - off, 0);
+ if (!em)
+ goto out;
+ if (IS_ERR(em)) {
+ ret = PTR_ERR(em);
+ goto out;
+ }
+ while (!end) {
+ off = em->start + em->len;
+ if (off >= max)
+ end = 1;
+
+ em_start = em->start;
+ em_len = em->len;
+
+ disko = 0;
+ flags = 0;
+
+ switch (em->block_start) {
+ case EXTENT_MAP_LAST_BYTE:
+ end = 1;
+ flags |= FIEMAP_EXTENT_LAST;
+ break;
+ case EXTENT_MAP_HOLE:
+ flags |= FIEMAP_EXTENT_UNWRITTEN;
+ break;
+ case EXTENT_MAP_INLINE:
+ flags |= (FIEMAP_EXTENT_DATA_INLINE |
+ FIEMAP_EXTENT_NOT_ALIGNED);
+ break;
+ case EXTENT_MAP_DELALLOC:
+ flags |= (FIEMAP_EXTENT_DELALLOC |
+ FIEMAP_EXTENT_UNKNOWN);
+ break;
+ default:
+ disko = em->block_start;
+ break;
+ }
+ if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
+ flags |= FIEMAP_EXTENT_ENCODED;
+
+ emflags = em->flags;
+ free_extent_map(em);
+ em = NULL;
+
+ if (!end) {
+ em = get_extent(inode, NULL, 0, off, max - off, 0);
+ if (!em)
+ goto out;
+ if (IS_ERR(em)) {
+ ret = PTR_ERR(em);
+ goto out;
+ }
+ emflags = em->flags;
+ }
+ if (test_bit(EXTENT_FLAG_VACANCY, &emflags)) {
+ flags |= FIEMAP_EXTENT_LAST;
+ end = 1;
+ }
+
+ ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
+ em_len, flags);
+ if (ret)
+ goto out_free;
+ }
+out_free:
+ free_extent_map(em);
+out:
+ unlock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
+ GFP_NOFS);
+ return ret;
+}
+
static inline struct page *extent_buffer_page(struct extent_buffer *eb,
unsigned long i)
{
gfp_t mask)
{
struct extent_buffer *eb = NULL;
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
unsigned long flags;
#endif
eb = kmem_cache_zalloc(extent_buffer_cache, mask);
eb->start = start;
eb->len = len;
- mutex_init(&eb->mutex);
-#ifdef LEAK_DEBUG
+ spin_lock_init(&eb->lock);
+ init_waitqueue_head(&eb->lock_wq);
+
+#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_add(&eb->leak_list, &buffers);
spin_unlock_irqrestore(&leak_lock, flags);
static void __free_extent_buffer(struct extent_buffer *eb)
{
-#ifdef LEAK_DEBUG
+#if LEAK_DEBUG
unsigned long flags;
spin_lock_irqsave(&leak_lock, flags);
list_del(&eb->leak_list);
unlock_page(p);
}
if (uptodate)
- eb->flags |= EXTENT_UPTODATE;
- eb->flags |= EXTENT_BUFFER_FILLED;
+ set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
spin_lock(&tree->buffer_lock);
exists = buffer_tree_insert(tree, start, &eb->rb_node);
unsigned long num_pages;
num_pages = num_extent_pages(eb->start, eb->len);
- eb->flags &= ~EXTENT_UPTODATE;
+ clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
clear_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
GFP_NOFS);
struct page *page;
int pg_uptodate = 1;
- if (eb->flags & EXTENT_UPTODATE)
+ if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
return 1;
ret = test_range_bit(tree, eb->start, eb->start + eb->len - 1,
struct bio *bio = NULL;
unsigned long bio_flags = 0;
- if (eb->flags & EXTENT_UPTODATE)
+ if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
return 0;
if (test_range_bit(tree, eb->start, eb->start + eb->len - 1,
}
if (all_uptodate) {
if (start_i == 0)
- eb->flags |= EXTENT_UPTODATE;
+ set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
goto unlock_exit;
}
}
if (!ret)
- eb->flags |= EXTENT_UPTODATE;
+ set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
return ret;
unlock_exit:
unmap_extent_buffer(eb, eb->map_token, km);
eb->map_token = NULL;
save = 1;
- WARN_ON(!mutex_is_locked(&eb->mutex));
}
err = map_private_extent_buffer(eb, start, min_len, token, map,
map_start, map_len, km);
/* flags for bio submission */
#define EXTENT_BIO_COMPRESSED 1
+/* these are bit numbers for test/set bit */
+#define EXTENT_BUFFER_UPTODATE 0
+#define EXTENT_BUFFER_BLOCKING 1
+
/*
* page->private values. Every page that is controlled by the extent
* map has page->private set to one.
unsigned long map_start;
unsigned long map_len;
struct page *first_page;
+ unsigned long bflags;
atomic_t refs;
- int flags;
struct list_head leak_list;
struct rb_node rb_node;
- struct mutex mutex;
+
+ /* the spinlock is used to protect most operations */
+ spinlock_t lock;
+
+ /*
+ * when we keep the lock held while blocking, waiters go onto
+ * the wq
+ */
+ wait_queue_head_t lock_wq;
};
struct extent_map_tree;
unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent);
+int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len, get_extent_t *get_extent);
int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/spinlock.h>
-#include <linux/version.h>
#include <linux/hardirq.h>
#include "extent_map.h"
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
-#include <linux/version.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
}
mutex_unlock(&root->fs_info->trans_mutex);
- root->fs_info->tree_log_batch++;
+ root->log_batch++;
filemap_fdatawrite(inode->i_mapping);
btrfs_wait_ordered_range(inode, 0, (u64)-1);
- root->fs_info->tree_log_batch++;
+ root->log_batch++;
/*
* ok we haven't committed the transaction yet, lets do a commit
#include <linux/statfs.h>
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
-#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/falloc.h>
#include "tree-log.h"
#include "ref-cache.h"
#include "compression.h"
+#include "locking.h"
struct btrfs_iget_args {
u64 ino;
u64 start, u64 end, int *page_started,
unsigned long *nr_written, int unlock);
+static int btrfs_init_inode_security(struct inode *inode, struct inode *dir)
+{
+ int err;
+
+ err = btrfs_init_acl(inode, dir);
+ if (!err)
+ err = btrfs_xattr_security_init(inode, dir);
+ return err;
+}
+
/*
* a very lame attempt at stopping writes when the FS is 85% full. There
* are countless ways this is incorrect, but it is better than nothing.
nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1;
nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE);
+ /*
+ * we don't want to send crud past the end of i_size through
+ * compression, that's just a waste of CPU time. So, if the
+ * end of the file is before the start of our current
+ * requested range of bytes, we bail out to the uncompressed
+ * cleanup code that can deal with all of this.
+ *
+ * It isn't really the fastest way to fix things, but this is a
+ * very uncommon corner.
+ */
+ if (actual_end <= start)
+ goto cleanup_and_bail_uncompressed;
+
total_compressed = actual_end - start;
/* we want to make sure that amount of ram required to uncompress
goto again;
}
} else {
+cleanup_and_bail_uncompressed:
/*
* No compression, but we still need to write the pages in
* the file we've been given so far. redirty the locked
struct inode *inode, u64 file_offset,
struct list_head *list)
{
- struct list_head *cur;
struct btrfs_ordered_sum *sum;
btrfs_set_trans_block_group(trans, inode);
- list_for_each(cur, list) {
- sum = list_entry(cur, struct btrfs_ordered_sum, list);
+
+ list_for_each_entry(sum, list, list) {
btrfs_csum_file_blocks(trans,
BTRFS_I(inode)->root->fs_info->csum_root, sum);
}
BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
+
BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0,
alloc_group_block, 0);
btrfs_free_path(path);
inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
break;
default:
+ inode->i_op = &btrfs_special_inode_operations;
init_special_inode(inode, inode->i_mode, rdev);
break;
}
goto failed;
}
+ btrfs_unlock_up_safe(path, 1);
leaf = path->nodes[0];
inode_item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_inode_item);
ref->generation = leaf_gen;
ref->nritems = 0;
+ btrfs_sort_leaf_ref(ref);
+
ret = btrfs_add_leaf_ref(root, ref, 0);
WARN_ON(ret);
btrfs_free_leaf_ref(root, ref);
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key found_key;
- u32 found_type;
+ u32 found_type = (u8)-1;
struct extent_buffer *leaf;
struct btrfs_file_extent_item *fi;
u64 extent_start = 0;
if (pending_del_nr)
goto del_pending;
btrfs_release_path(root, path);
+ if (found_type == BTRFS_INODE_ITEM_KEY)
+ break;
goto search_again;
}
BUG_ON(ret);
pending_del_nr = 0;
btrfs_release_path(root, path);
+ if (found_type == BTRFS_INODE_ITEM_KEY)
+ break;
goto search_again;
}
}
/* Reached end of directory/root. Bump pos past the last item. */
if (key_type == BTRFS_DIR_INDEX_KEY)
- filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
+ filp->f_pos = INT_LIMIT(off_t);
else
filp->f_pos++;
nopos:
root->highest_inode = objectid;
inode->i_uid = current_fsuid();
- inode->i_gid = current_fsgid();
+
+ if (dir && (dir->i_mode & S_ISGID)) {
+ inode->i_gid = dir->i_gid;
+ if (S_ISDIR(mode))
+ mode |= S_ISGID;
+ } else
+ inode->i_gid = current_fsgid();
+
inode->i_mode = mode;
inode->i_ino = objectid;
inode_set_bytes(inode, 0);
if (IS_ERR(inode))
goto out_unlock;
- err = btrfs_init_acl(inode, dir);
+ err = btrfs_init_inode_security(inode, dir);
if (err) {
drop_inode = 1;
goto out_unlock;
if (IS_ERR(inode))
goto out_unlock;
- err = btrfs_init_acl(inode, dir);
+ err = btrfs_init_inode_security(inode, dir);
if (err) {
drop_inode = 1;
goto out_unlock;
drop_on_err = 1;
- err = btrfs_init_acl(inode, dir);
+ err = btrfs_init_inode_security(inode, dir);
if (err)
goto out_fail;
return -EINVAL;
}
-static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
+static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len)
{
- return extent_bmap(mapping, iblock, btrfs_get_extent);
+ return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent);
}
int btrfs_readpage(struct file *file, struct page *page)
if (IS_ERR(inode))
goto out_unlock;
- err = btrfs_init_acl(inode, dir);
+ err = btrfs_init_inode_security(inode, dir);
if (err) {
drop_inode = 1;
goto out_unlock;
.clear_bit_hook = btrfs_clear_bit_hook,
};
+/*
+ * btrfs doesn't support the bmap operation because swapfiles
+ * use bmap to make a mapping of extents in the file. They assume
+ * these extents won't change over the life of the file and they
+ * use the bmap result to do IO directly to the drive.
+ *
+ * the btrfs bmap call would return logical addresses that aren't
+ * suitable for IO and they also will change frequently as COW
+ * operations happen. So, swapfile + btrfs == corruption.
+ *
+ * For now we're avoiding this by dropping bmap.
+ */
static struct address_space_operations btrfs_aops = {
.readpage = btrfs_readpage,
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
.readpages = btrfs_readpages,
.sync_page = block_sync_page,
- .bmap = btrfs_bmap,
.direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
.removexattr = btrfs_removexattr,
.permission = btrfs_permission,
.fallocate = btrfs_fallocate,
+ .fiemap = btrfs_fiemap,
};
static struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.permission = btrfs_permission,
+ .setxattr = btrfs_setxattr,
+ .getxattr = btrfs_getxattr,
+ .listxattr = btrfs_listxattr,
+ .removexattr = btrfs_removexattr,
};
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
#include <linux/security.h>
-#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include "compat.h"
#include "locking.h"
/*
- * locks the per buffer mutex in an extent buffer. This uses adaptive locks
- * and the spin is not tuned very extensively. The spinning does make a big
- * difference in almost every workload, but spinning for the right amount of
- * time needs some help.
- *
- * In general, we want to spin as long as the lock holder is doing btree
- * searches, and we should give up if they are in more expensive code.
+ * btrfs_header_level() isn't free, so don't call it when lockdep isn't
+ * on
*/
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static inline void spin_nested(struct extent_buffer *eb)
+{
+ spin_lock_nested(&eb->lock, BTRFS_MAX_LEVEL - btrfs_header_level(eb));
+}
+#else
+static inline void spin_nested(struct extent_buffer *eb)
+{
+ spin_lock(&eb->lock);
+}
+#endif
-int btrfs_tree_lock(struct extent_buffer *eb)
+/*
+ * Setting a lock to blocking will drop the spinlock and set the
+ * flag that forces other procs who want the lock to wait. After
+ * this you can safely schedule with the lock held.
+ */
+void btrfs_set_lock_blocking(struct extent_buffer *eb)
{
- int i;
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags)) {
+ set_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags);
+ spin_unlock(&eb->lock);
+ }
+ /* exit with the spin lock released and the bit set */
+}
- if (mutex_trylock(&eb->mutex))
- return 0;
+/*
+ * clearing the blocking flag will take the spinlock again.
+ * After this you can't safely schedule
+ */
+void btrfs_clear_lock_blocking(struct extent_buffer *eb)
+{
+ if (test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags)) {
+ spin_nested(eb);
+ clear_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags);
+ smp_mb__after_clear_bit();
+ }
+ /* exit with the spin lock held */
+}
+
+/*
+ * unfortunately, many of the places that currently set a lock to blocking
+ * don't end up blocking for every long, and often they don't block
+ * at all. For a dbench 50 run, if we don't spin one the blocking bit
+ * at all, the context switch rate can jump up to 400,000/sec or more.
+ *
+ * So, we're still stuck with this crummy spin on the blocking bit,
+ * at least until the most common causes of the short blocks
+ * can be dealt with.
+ */
+static int btrfs_spin_on_block(struct extent_buffer *eb)
+{
+ int i;
for (i = 0; i < 512; i++) {
cpu_relax();
- if (mutex_trylock(&eb->mutex))
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ return 1;
+ if (need_resched())
+ break;
+ }
+ return 0;
+}
+
+/*
+ * This is somewhat different from trylock. It will take the
+ * spinlock but if it finds the lock is set to blocking, it will
+ * return without the lock held.
+ *
+ * returns 1 if it was able to take the lock and zero otherwise
+ *
+ * After this call, scheduling is not safe without first calling
+ * btrfs_set_lock_blocking()
+ */
+int btrfs_try_spin_lock(struct extent_buffer *eb)
+{
+ int i;
+
+ spin_nested(eb);
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ return 1;
+ spin_unlock(&eb->lock);
+
+ /* spin for a bit on the BLOCKING flag */
+ for (i = 0; i < 2; i++) {
+ if (!btrfs_spin_on_block(eb))
+ break;
+
+ spin_nested(eb);
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ return 1;
+ spin_unlock(&eb->lock);
+ }
+ return 0;
+}
+
+/*
+ * the autoremove wake function will return 0 if it tried to wake up
+ * a process that was already awake, which means that process won't
+ * count as an exclusive wakeup. The waitq code will continue waking
+ * procs until it finds one that was actually sleeping.
+ *
+ * For btrfs, this isn't quite what we want. We want a single proc
+ * to be notified that the lock is ready for taking. If that proc
+ * already happen to be awake, great, it will loop around and try for
+ * the lock.
+ *
+ * So, btrfs_wake_function always returns 1, even when the proc that we
+ * tried to wake up was already awake.
+ */
+static int btrfs_wake_function(wait_queue_t *wait, unsigned mode,
+ int sync, void *key)
+{
+ autoremove_wake_function(wait, mode, sync, key);
+ return 1;
+}
+
+/*
+ * returns with the extent buffer spinlocked.
+ *
+ * This will spin and/or wait as required to take the lock, and then
+ * return with the spinlock held.
+ *
+ * After this call, scheduling is not safe without first calling
+ * btrfs_set_lock_blocking()
+ */
+int btrfs_tree_lock(struct extent_buffer *eb)
+{
+ DEFINE_WAIT(wait);
+ wait.func = btrfs_wake_function;
+
+ while(1) {
+ spin_nested(eb);
+
+ /* nobody is blocking, exit with the spinlock held */
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
return 0;
+
+ /*
+ * we have the spinlock, but the real owner is blocking.
+ * wait for them
+ */
+ spin_unlock(&eb->lock);
+
+ /*
+ * spin for a bit, and if the blocking flag goes away,
+ * loop around
+ */
+ if (btrfs_spin_on_block(eb))
+ continue;
+
+ prepare_to_wait_exclusive(&eb->lock_wq, &wait,
+ TASK_UNINTERRUPTIBLE);
+
+ if (test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ schedule();
+
+ finish_wait(&eb->lock_wq, &wait);
}
- cpu_relax();
- mutex_lock_nested(&eb->mutex, BTRFS_MAX_LEVEL - btrfs_header_level(eb));
return 0;
}
+/*
+ * Very quick trylock, this does not spin or schedule. It returns
+ * 1 with the spinlock held if it was able to take the lock, or it
+ * returns zero if it was unable to take the lock.
+ *
+ * After this call, scheduling is not safe without first calling
+ * btrfs_set_lock_blocking()
+ */
int btrfs_try_tree_lock(struct extent_buffer *eb)
{
- return mutex_trylock(&eb->mutex);
+ if (spin_trylock(&eb->lock)) {
+ if (test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags)) {
+ /*
+ * we've got the spinlock, but the real owner is
+ * blocking. Drop the spinlock and return failure
+ */
+ spin_unlock(&eb->lock);
+ return 0;
+ }
+ return 1;
+ }
+ /* someone else has the spinlock giveup */
+ return 0;
}
int btrfs_tree_unlock(struct extent_buffer *eb)
{
- mutex_unlock(&eb->mutex);
+ /*
+ * if we were a blocking owner, we don't have the spinlock held
+ * just clear the bit and look for waiters
+ */
+ if (test_and_clear_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ smp_mb__after_clear_bit();
+ else
+ spin_unlock(&eb->lock);
+
+ if (waitqueue_active(&eb->lock_wq))
+ wake_up(&eb->lock_wq);
return 0;
}
int btrfs_tree_locked(struct extent_buffer *eb)
{
- return mutex_is_locked(&eb->mutex);
+ return test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags) ||
+ spin_is_locked(&eb->lock);
}
/*
{
int i;
struct extent_buffer *eb;
+
for (i = level; i <= level + 1 && i < BTRFS_MAX_LEVEL; i++) {
eb = path->nodes[i];
if (!eb)
break;
smp_mb();
- if (!list_empty(&eb->mutex.wait_list))
+ if (spin_is_contended(&eb->lock) ||
+ waitqueue_active(&eb->lock_wq))
return 1;
}
return 0;
int btrfs_tree_lock(struct extent_buffer *eb);
int btrfs_tree_unlock(struct extent_buffer *eb);
int btrfs_tree_locked(struct extent_buffer *eb);
+
int btrfs_try_tree_lock(struct extent_buffer *eb);
+int btrfs_try_spin_lock(struct extent_buffer *eb);
+
int btrfs_path_lock_waiting(struct btrfs_path *path, int level);
+
+void btrfs_set_lock_blocking(struct extent_buffer *eb);
+void btrfs_clear_lock_blocking(struct extent_buffer *eb);
#endif
struct btrfs_sector_sum *sector_sums;
struct btrfs_ordered_extent *ordered;
struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
- struct list_head *cur;
unsigned long num_sectors;
unsigned long i;
u32 sectorsize = BTRFS_I(inode)->root->sectorsize;
return 1;
mutex_lock(&tree->mutex);
- list_for_each_prev(cur, &ordered->list) {
- ordered_sum = list_entry(cur, struct btrfs_ordered_sum, list);
+ list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
if (disk_bytenr >= ordered_sum->bytenr) {
num_sectors = ordered_sum->len / sectorsize;
sector_sums = ordered_sum->sums;
*/
#include <linux/sched.h>
+#include <linux/sort.h>
#include "ctree.h"
#include "ref-cache.h"
#include "transaction.h"
int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen,
int shared);
int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
-
#endif
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/miscdevice.h>
-#include <linux/version.h>
#include <linux/magic.h>
#include "compat.h"
#include "ctree.h"
struct btrfs_ioctl_vol_args *vol;
struct btrfs_fs_devices *fs_devices;
int ret = -ENOTTY;
- int len;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+ if (!vol)
+ return -ENOMEM;
+
if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
ret = -EFAULT;
goto out;
}
- len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
switch (cmd) {
case BTRFS_IOC_SCAN_DEV:
{
struct btrfs_pending_snapshot *pending;
struct list_head *head = &trans->transaction->pending_snapshots;
- struct list_head *cur;
int ret;
- list_for_each(cur, head) {
- pending = list_entry(cur, struct btrfs_pending_snapshot, list);
+ list_for_each_entry(pending, head, list) {
ret = create_pending_snapshot(trans, fs_info, pending);
BUG_ON(ret);
}
u32 nritems;
root_node = btrfs_lock_root_node(root);
+ btrfs_set_lock_blocking(root_node);
nritems = btrfs_header_nritems(root_node);
root->defrag_max.objectid = 0;
/* from above we know this is not a leaf */
* and once to do all the other items.
*/
-/*
- * btrfs_add_log_tree adds a new per-subvolume log tree into the
- * tree of log tree roots. This must be called with a tree log transaction
- * running (see start_log_trans).
- */
-static int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- struct btrfs_key key;
- struct btrfs_root_item root_item;
- struct btrfs_inode_item *inode_item;
- struct extent_buffer *leaf;
- struct btrfs_root *new_root = root;
- int ret;
- u64 objectid = root->root_key.objectid;
-
- leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
- BTRFS_TREE_LOG_OBJECTID,
- trans->transid, 0, 0, 0);
- if (IS_ERR(leaf)) {
- ret = PTR_ERR(leaf);
- return ret;
- }
-
- btrfs_set_header_nritems(leaf, 0);
- btrfs_set_header_level(leaf, 0);
- btrfs_set_header_bytenr(leaf, leaf->start);
- btrfs_set_header_generation(leaf, trans->transid);
- btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
-
- write_extent_buffer(leaf, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(leaf),
- BTRFS_FSID_SIZE);
- btrfs_mark_buffer_dirty(leaf);
-
- inode_item = &root_item.inode;
- memset(inode_item, 0, sizeof(*inode_item));
- inode_item->generation = cpu_to_le64(1);
- inode_item->size = cpu_to_le64(3);
- inode_item->nlink = cpu_to_le32(1);
- inode_item->nbytes = cpu_to_le64(root->leafsize);
- inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
-
- btrfs_set_root_bytenr(&root_item, leaf->start);
- btrfs_set_root_generation(&root_item, trans->transid);
- btrfs_set_root_level(&root_item, 0);
- btrfs_set_root_refs(&root_item, 0);
- btrfs_set_root_used(&root_item, 0);
-
- memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
- root_item.drop_level = 0;
-
- btrfs_tree_unlock(leaf);
- free_extent_buffer(leaf);
- leaf = NULL;
-
- btrfs_set_root_dirid(&root_item, 0);
-
- key.objectid = BTRFS_TREE_LOG_OBJECTID;
- key.offset = objectid;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- ret = btrfs_insert_root(trans, root->fs_info->log_root_tree, &key,
- &root_item);
- if (ret)
- goto fail;
-
- new_root = btrfs_read_fs_root_no_radix(root->fs_info->log_root_tree,
- &key);
- BUG_ON(!new_root);
-
- WARN_ON(root->log_root);
- root->log_root = new_root;
-
- /*
- * log trees do not get reference counted because they go away
- * before a real commit is actually done. They do store pointers
- * to file data extents, and those reference counts still get
- * updated (along with back refs to the log tree).
- */
- new_root->ref_cows = 0;
- new_root->last_trans = trans->transid;
-
- /*
- * we need to make sure the root block for this new tree
- * is marked as dirty in the dirty_log_pages tree. This
- * is how it gets flushed down to disk at tree log commit time.
- *
- * the tree logging mutex keeps others from coming in and changing
- * the new_root->node, so we can safely access it here
- */
- set_extent_dirty(&new_root->dirty_log_pages, new_root->node->start,
- new_root->node->start + new_root->node->len - 1,
- GFP_NOFS);
-
-fail:
- return ret;
-}
-
/*
* start a sub transaction and setup the log tree
* this increments the log tree writer count to make the people
struct btrfs_root *root)
{
int ret;
+
+ mutex_lock(&root->log_mutex);
+ if (root->log_root) {
+ root->log_batch++;
+ atomic_inc(&root->log_writers);
+ mutex_unlock(&root->log_mutex);
+ return 0;
+ }
mutex_lock(&root->fs_info->tree_log_mutex);
if (!root->fs_info->log_root_tree) {
ret = btrfs_init_log_root_tree(trans, root->fs_info);
ret = btrfs_add_log_tree(trans, root);
BUG_ON(ret);
}
- atomic_inc(&root->fs_info->tree_log_writers);
- root->fs_info->tree_log_batch++;
mutex_unlock(&root->fs_info->tree_log_mutex);
+ root->log_batch++;
+ atomic_inc(&root->log_writers);
+ mutex_unlock(&root->log_mutex);
return 0;
}
if (!root->log_root)
return -ENOENT;
- mutex_lock(&root->fs_info->tree_log_mutex);
+ mutex_lock(&root->log_mutex);
if (root->log_root) {
ret = 0;
- atomic_inc(&root->fs_info->tree_log_writers);
- root->fs_info->tree_log_batch++;
+ atomic_inc(&root->log_writers);
}
- mutex_unlock(&root->fs_info->tree_log_mutex);
+ mutex_unlock(&root->log_mutex);
return ret;
}
*/
static int end_log_trans(struct btrfs_root *root)
{
- atomic_dec(&root->fs_info->tree_log_writers);
- smp_mb();
- if (waitqueue_active(&root->fs_info->tree_log_wait))
- wake_up(&root->fs_info->tree_log_wait);
+ if (atomic_dec_and_test(&root->log_writers)) {
+ smp_mb();
+ if (waitqueue_active(&root->log_writer_wait))
+ wake_up(&root->log_writer_wait);
+ }
return 0;
}
btrfs_tree_lock(next);
clean_tree_block(trans, root, next);
+ btrfs_set_lock_blocking(next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
next = path->nodes[*level];
btrfs_tree_lock(next);
clean_tree_block(trans, root, next);
+ btrfs_set_lock_blocking(next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
btrfs_tree_lock(next);
clean_tree_block(trans, root, next);
+ btrfs_set_lock_blocking(next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
btrfs_tree_lock(next);
clean_tree_block(trans, log, next);
+ btrfs_set_lock_blocking(next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
}
}
btrfs_free_path(path);
- if (wc->free)
- free_extent_buffer(log->node);
return ret;
}
-static int wait_log_commit(struct btrfs_root *log)
+/*
+ * helper function to update the item for a given subvolumes log root
+ * in the tree of log roots
+ */
+static int update_log_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *log)
+{
+ int ret;
+
+ if (log->log_transid == 1) {
+ /* insert root item on the first sync */
+ ret = btrfs_insert_root(trans, log->fs_info->log_root_tree,
+ &log->root_key, &log->root_item);
+ } else {
+ ret = btrfs_update_root(trans, log->fs_info->log_root_tree,
+ &log->root_key, &log->root_item);
+ }
+ return ret;
+}
+
+static int wait_log_commit(struct btrfs_root *root, unsigned long transid)
{
DEFINE_WAIT(wait);
- u64 transid = log->fs_info->tree_log_transid;
+ int index = transid % 2;
+ /*
+ * we only allow two pending log transactions at a time,
+ * so we know that if ours is more than 2 older than the
+ * current transaction, we're done
+ */
do {
- prepare_to_wait(&log->fs_info->tree_log_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- mutex_unlock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_commit))
+ prepare_to_wait(&root->log_commit_wait[index],
+ &wait, TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&root->log_mutex);
+ if (root->log_transid < transid + 2 &&
+ atomic_read(&root->log_commit[index]))
schedule();
- finish_wait(&log->fs_info->tree_log_wait, &wait);
- mutex_lock(&log->fs_info->tree_log_mutex);
- } while (transid == log->fs_info->tree_log_transid &&
- atomic_read(&log->fs_info->tree_log_commit));
+ finish_wait(&root->log_commit_wait[index], &wait);
+ mutex_lock(&root->log_mutex);
+ } while (root->log_transid < transid + 2 &&
+ atomic_read(&root->log_commit[index]));
+ return 0;
+}
+
+static int wait_for_writer(struct btrfs_root *root)
+{
+ DEFINE_WAIT(wait);
+ while (atomic_read(&root->log_writers)) {
+ prepare_to_wait(&root->log_writer_wait,
+ &wait, TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&root->log_mutex);
+ if (atomic_read(&root->log_writers))
+ schedule();
+ mutex_lock(&root->log_mutex);
+ finish_wait(&root->log_writer_wait, &wait);
+ }
return 0;
}
int btrfs_sync_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
+ int index1;
+ int index2;
int ret;
- unsigned long batch;
struct btrfs_root *log = root->log_root;
+ struct btrfs_root *log_root_tree = root->fs_info->log_root_tree;
- mutex_lock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_commit)) {
- wait_log_commit(log);
- goto out;
+ mutex_lock(&root->log_mutex);
+ index1 = root->log_transid % 2;
+ if (atomic_read(&root->log_commit[index1])) {
+ wait_log_commit(root, root->log_transid);
+ mutex_unlock(&root->log_mutex);
+ return 0;
}
- atomic_set(&log->fs_info->tree_log_commit, 1);
+ atomic_set(&root->log_commit[index1], 1);
+
+ /* wait for previous tree log sync to complete */
+ if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
+ wait_log_commit(root, root->log_transid - 1);
while (1) {
- batch = log->fs_info->tree_log_batch;
- mutex_unlock(&log->fs_info->tree_log_mutex);
+ unsigned long batch = root->log_batch;
+ mutex_unlock(&root->log_mutex);
schedule_timeout_uninterruptible(1);
- mutex_lock(&log->fs_info->tree_log_mutex);
-
- while (atomic_read(&log->fs_info->tree_log_writers)) {
- DEFINE_WAIT(wait);
- prepare_to_wait(&log->fs_info->tree_log_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- mutex_unlock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_writers))
- schedule();
- mutex_lock(&log->fs_info->tree_log_mutex);
- finish_wait(&log->fs_info->tree_log_wait, &wait);
- }
- if (batch == log->fs_info->tree_log_batch)
+ mutex_lock(&root->log_mutex);
+ wait_for_writer(root);
+ if (batch == root->log_batch)
break;
}
ret = btrfs_write_and_wait_marked_extents(log, &log->dirty_log_pages);
BUG_ON(ret);
- ret = btrfs_write_and_wait_marked_extents(root->fs_info->log_root_tree,
- &root->fs_info->log_root_tree->dirty_log_pages);
+
+ btrfs_set_root_bytenr(&log->root_item, log->node->start);
+ btrfs_set_root_generation(&log->root_item, trans->transid);
+ btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node));
+
+ root->log_batch = 0;
+ root->log_transid++;
+ log->log_transid = root->log_transid;
+ smp_mb();
+ /*
+ * log tree has been flushed to disk, new modifications of
+ * the log will be written to new positions. so it's safe to
+ * allow log writers to go in.
+ */
+ mutex_unlock(&root->log_mutex);
+
+ mutex_lock(&log_root_tree->log_mutex);
+ log_root_tree->log_batch++;
+ atomic_inc(&log_root_tree->log_writers);
+ mutex_unlock(&log_root_tree->log_mutex);
+
+ ret = update_log_root(trans, log);
+ BUG_ON(ret);
+
+ mutex_lock(&log_root_tree->log_mutex);
+ if (atomic_dec_and_test(&log_root_tree->log_writers)) {
+ smp_mb();
+ if (waitqueue_active(&log_root_tree->log_writer_wait))
+ wake_up(&log_root_tree->log_writer_wait);
+ }
+
+ index2 = log_root_tree->log_transid % 2;
+ if (atomic_read(&log_root_tree->log_commit[index2])) {
+ wait_log_commit(log_root_tree, log_root_tree->log_transid);
+ mutex_unlock(&log_root_tree->log_mutex);
+ goto out;
+ }
+ atomic_set(&log_root_tree->log_commit[index2], 1);
+
+ if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2]))
+ wait_log_commit(log_root_tree, log_root_tree->log_transid - 1);
+
+ wait_for_writer(log_root_tree);
+
+ ret = btrfs_write_and_wait_marked_extents(log_root_tree,
+ &log_root_tree->dirty_log_pages);
BUG_ON(ret);
btrfs_set_super_log_root(&root->fs_info->super_for_commit,
- log->fs_info->log_root_tree->node->start);
+ log_root_tree->node->start);
btrfs_set_super_log_root_level(&root->fs_info->super_for_commit,
- btrfs_header_level(log->fs_info->log_root_tree->node));
+ btrfs_header_level(log_root_tree->node));
+
+ log_root_tree->log_batch = 0;
+ log_root_tree->log_transid++;
+ smp_mb();
+
+ mutex_unlock(&log_root_tree->log_mutex);
+
+ /*
+ * nobody else is going to jump in and write the the ctree
+ * super here because the log_commit atomic below is protecting
+ * us. We must be called with a transaction handle pinning
+ * the running transaction open, so a full commit can't hop
+ * in and cause problems either.
+ */
+ write_ctree_super(trans, root->fs_info->tree_root, 2);
- write_ctree_super(trans, log->fs_info->tree_root, 2);
- log->fs_info->tree_log_transid++;
- log->fs_info->tree_log_batch = 0;
- atomic_set(&log->fs_info->tree_log_commit, 0);
+ atomic_set(&log_root_tree->log_commit[index2], 0);
smp_mb();
- if (waitqueue_active(&log->fs_info->tree_log_wait))
- wake_up(&log->fs_info->tree_log_wait);
+ if (waitqueue_active(&log_root_tree->log_commit_wait[index2]))
+ wake_up(&log_root_tree->log_commit_wait[index2]);
out:
- mutex_unlock(&log->fs_info->tree_log_mutex);
+ atomic_set(&root->log_commit[index1], 0);
+ smp_mb();
+ if (waitqueue_active(&root->log_commit_wait[index1]))
+ wake_up(&root->log_commit_wait[index1]);
return 0;
}
start, end, GFP_NOFS);
}
- log = root->log_root;
- ret = btrfs_del_root(trans, root->fs_info->log_root_tree,
- &log->root_key);
- BUG_ON(ret);
+ if (log->log_transid > 0) {
+ ret = btrfs_del_root(trans, root->fs_info->log_root_tree,
+ &log->root_key);
+ BUG_ON(ret);
+ }
root->log_root = NULL;
- kfree(root->log_root);
+ free_extent_buffer(log->node);
+ kfree(log);
return 0;
}
-/*
- * helper function to update the item for a given subvolumes log root
- * in the tree of log roots
- */
-static int update_log_root(struct btrfs_trans_handle *trans,
- struct btrfs_root *log)
-{
- u64 bytenr = btrfs_root_bytenr(&log->root_item);
- int ret;
-
- if (log->node->start == bytenr)
- return 0;
-
- btrfs_set_root_bytenr(&log->root_item, log->node->start);
- btrfs_set_root_generation(&log->root_item, trans->transid);
- btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node));
- ret = btrfs_update_root(trans, log->fs_info->log_root_tree,
- &log->root_key, &log->root_item);
- BUG_ON(ret);
- return ret;
-}
-
/*
* If both a file and directory are logged, and unlinks or renames are
* mixed in, we have a few interesting corners:
btrfs_free_path(path);
btrfs_free_path(dst_path);
-
- mutex_lock(&root->fs_info->tree_log_mutex);
- ret = update_log_root(trans, log);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->tree_log_mutex);
out:
return 0;
}
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/random.h>
-#include <linux/version.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
u64 devid, u8 *uuid)
{
struct btrfs_device *dev;
- struct list_head *cur;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (dev->devid == devid &&
(!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
{
- struct list_head *cur;
struct btrfs_fs_devices *fs_devices;
- list_for_each(cur, &fs_uuids) {
- fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
+ list_for_each_entry(fs_devices, &fs_uuids, list) {
if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
return fs_devices;
}
loop:
spin_lock(&device->io_lock);
+loop_lock:
/* take all the bios off the list at once and process them
* later on (without the lock held). But, remember the
* tail and other pointers so the bios can be properly reinserted
* is now congested. Back off and let other work structs
* run instead
*/
- if (pending && bdi_write_congested(bdi) &&
+ if (pending && bdi_write_congested(bdi) && num_run > 16 &&
fs_info->fs_devices->open_devices > 1) {
struct bio *old_head;
tail->bi_next = old_head;
else
device->pending_bio_tail = tail;
- device->running_pending = 0;
+
+ device->running_pending = 1;
spin_unlock(&device->io_lock);
btrfs_requeue_work(&device->work);
}
if (again)
goto loop;
+
+ spin_lock(&device->io_lock);
+ if (device->pending_bios)
+ goto loop_lock;
+ spin_unlock(&device->io_lock);
done:
return 0;
}
int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *tmp;
- struct list_head *cur;
- struct btrfs_device *device;
+ struct btrfs_device *device, *next;
mutex_lock(&uuid_mutex);
again:
- list_for_each_safe(cur, tmp, &fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
if (device->in_fs_metadata)
continue;
static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *cur;
struct btrfs_device *device;
if (--fs_devices->opened > 0)
return 0;
- list_for_each(cur, &fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (device->bdev) {
close_bdev_exclusive(device->bdev, device->mode);
fs_devices->open_devices--;
{
struct block_device *bdev;
struct list_head *head = &fs_devices->devices;
- struct list_head *cur;
struct btrfs_device *device;
struct block_device *latest_bdev = NULL;
struct buffer_head *bh;
int seeding = 1;
int ret = 0;
- list_for_each(cur, head) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, head, dev_list) {
if (device->bdev)
continue;
if (!device->name)
*(unsigned long long *)disk_super->fsid,
*(unsigned long long *)(disk_super->fsid + 8));
}
- printk(KERN_INFO "devid %llu transid %llu %s\n",
+ printk(KERN_CONT "devid %llu transid %llu %s\n",
(unsigned long long)devid, (unsigned long long)transid, path);
ret = device_list_add(path, disk_super, devid, fs_devices_ret);
}
if (strcmp(device_path, "missing") == 0) {
- struct list_head *cur;
struct list_head *devices;
struct btrfs_device *tmp;
device = NULL;
devices = &root->fs_info->fs_devices->devices;
- list_for_each(cur, devices) {
- tmp = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(tmp, devices, dev_list) {
if (tmp->in_fs_metadata && !tmp->bdev) {
device = tmp;
break;
struct btrfs_trans_handle *trans;
struct btrfs_device *device;
struct block_device *bdev;
- struct list_head *cur;
struct list_head *devices;
struct super_block *sb = root->fs_info->sb;
u64 total_bytes;
mutex_lock(&root->fs_info->volume_mutex);
devices = &root->fs_info->fs_devices->devices;
- list_for_each(cur, devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, devices, dev_list) {
if (device->bdev == bdev) {
ret = -EEXIST;
goto error;
int btrfs_balance(struct btrfs_root *dev_root)
{
int ret;
- struct list_head *cur;
struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
struct btrfs_device *device;
u64 old_size;
dev_root = dev_root->fs_info->dev_root;
/* step one make some room on all the devices */
- list_for_each(cur, devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, devices, dev_list) {
old_size = device->total_bytes;
size_to_free = div_factor(old_size, 1);
size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/xattr.h>
+#include <linux/security.h>
#include "ctree.h"
#include "btrfs_inode.h"
#include "transaction.h"
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
strlen(name), 0);
- if (!di || IS_ERR(di)) {
+ if (!di) {
ret = -ENODATA;
goto out;
+ } else if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out;
}
leaf = path->nodes[0];
ret = -ERANGE;
goto out;
}
+
+ /*
+ * The way things are packed into the leaf is like this
+ * |struct btrfs_dir_item|name|data|
+ * where name is the xattr name, so security.foo, and data is the
+ * content of the xattr. data_ptr points to the location in memory
+ * where the data starts in the in memory leaf
+ */
data_ptr = (unsigned long)((char *)(di + 1) +
btrfs_dir_name_len(leaf, di));
read_extent_buffer(leaf, buffer, data_ptr,
if (!path)
return -ENOMEM;
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_join_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
/* first lets see if we already have this xattr */
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto err;
- ret = 0;
advance = 0;
while (1) {
leaf = path->nodes[0];
return -EOPNOTSUPP;
return __btrfs_setxattr(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
}
+
+int btrfs_xattr_security_init(struct inode *inode, struct inode *dir)
+{
+ int err;
+ size_t len;
+ void *value;
+ char *suffix;
+ char *name;
+
+ err = security_inode_init_security(inode, dir, &suffix, &value, &len);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ name = kmalloc(XATTR_SECURITY_PREFIX_LEN + strlen(suffix) + 1,
+ GFP_NOFS);
+ if (!name) {
+ err = -ENOMEM;
+ } else {
+ strcpy(name, XATTR_SECURITY_PREFIX);
+ strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
+ err = __btrfs_setxattr(inode, name, value, len, 0);
+ kfree(name);
+ }
+
+ kfree(suffix);
+ kfree(value);
+ return err;
+}
const void *value, size_t size, int flags);
extern int btrfs_removexattr(struct dentry *dentry, const char *name);
+extern int btrfs_xattr_security_init(struct inode *inode, struct inode *dir);
+
#endif /* __XATTR__ */
projects / linux-2.6-block.git / commitdiff