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Btrfs: fix possible empty list access when flushing the delalloc inodes

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We didn't have a lock to protect the access to the delalloc inodes list, that is
we might access a empty delalloc inodes list if someone start flushing delalloc
inodes because the delalloc inodes were moved into a other list temporarily.
Fix it by wrapping the access with a lock.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Miao Xie 2014-03-06 13:55:03 +08:00 • committed by Josef Bacik
parent 31f3d255c6
commit 573bfb72f7
3 changed files with 8 additions and 0 deletions
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2
fs/btrfs/disk-io.c
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@ -1221,6 +1221,7 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
mutex_init(&root->objectid_mutex);
mutex_init(&root->log_mutex);
mutex_init(&root->ordered_extent_mutex);
mutex_init(&root->delalloc_mutex);
init_waitqueue_head(&root->log_writer_wait);
init_waitqueue_head(&root->log_commit_wait[0]);
init_waitqueue_head(&root->log_commit_wait[1]);
@ -2209,6 +2210,7 @@ int open_ctree(struct super_block *sb,
spin_lock_init(&fs_info->buffer_lock);
rwlock_init(&fs_info->tree_mod_log_lock);
mutex_init(&fs_info->reloc_mutex);
mutex_init(&fs_info->delalloc_root_mutex);
seqlock_init(&fs_info->profiles_lock);
init_completion(&fs_info->kobj_unregister);