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authorFilipe David Borba Manana <fdmanana@gmail.com>2014-01-11 21:31:25 +0000
committerChris Mason <clm@fb.com>2014-01-28 13:20:30 -0800
commitc57c2b3ed248b3f1712e4172eb85b361199582f2 (patch)
tree7dc61c170e763cb469c0d11957152e702356093a /fs
parentf499e40fd97698a1c48d188279647009b21905fe (diff)
downloadop-kernel-dev-c57c2b3ed248b3f1712e4172eb85b361199582f2.zip
op-kernel-dev-c57c2b3ed248b3f1712e4172eb85b361199582f2.tar.gz
Btrfs: unlock inodes in correct order in clone ioctl
In the clone ioctl, when the source and target inodes are different, we can acquire their mutexes in 2 possible different orders. After we're done cloning, we were releasing the mutexes always in the same order - the most correct way of doing it is to release them by the reverse order they were acquired. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ioctl.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 332b624..5ed5bd0 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3263,9 +3263,17 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
out_unlock:
- mutex_unlock(&src->i_mutex);
- if (!same_inode)
- mutex_unlock(&inode->i_mutex);
+ if (!same_inode) {
+ if (inode < src) {
+ mutex_unlock(&src->i_mutex);
+ mutex_unlock(&inode->i_mutex);
+ } else {
+ mutex_unlock(&inode->i_mutex);
+ mutex_unlock(&src->i_mutex);
+ }
+ } else {
+ mutex_unlock(&src->i_mutex);
+ }
out_fput:
fdput(src_file);
out_drop_write:
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