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btrfs: Fix the bug that fs_info->pending_changes is never cleared.

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Fs_info->pending_changes is never cleared since the original code uses
cmpxchg(&fs_info->pending_changes, 0, 0), which will only clear it if
pending_changes is already 0.

This will cause a lot of problem when mount it with inode_cache mount
option.
If the btrfs is mounted as inode_cache, pending_changes will always be
1, even when the fs is frozen.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-01-20 17:05:33 +08:00 committed by Chris Mason
parent 6e1103a6e9
commit 6c9fe14f9d
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/transaction.c
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@ -2118,7 +2118,7 @@ void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info)
unsigned long prev;
unsigned long bit;
prev = cmpxchg(&fs_info->pending_changes, 0, 0);
prev = xchg(&fs_info->pending_changes, 0);
if (!prev)
return;