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authorMiao Xie <miaox@cn.fujitsu.com>2014-03-06 09:55:03 +0400
committerJosef Bacik <jbacik@fb.com>2014-03-10 23:17:29 +0400
commit573bfb72f7608eb7097d2dd036a714a6ab20cffe (patch)
tree5434c2e82299cf22af4470fef31d3890d209a0b9 /fs/btrfs/disk-io.c
parent31f3d255c677073f83daa1e0671bbf2157bf8edc (diff)
downloadlinux-573bfb72f7608eb7097d2dd036a714a6ab20cffe.tar.xz
Btrfs: fix possible empty list access when flushing the delalloc inodes
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>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 237b5b5a2200..d9698fda2d12 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -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);