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f2fs: avoid potential deadlock in f2fs_move_file_range

Browse Source 
Thread A			Thread B
- inode_lock fileA
				- inode_lock fileB
				 - inode_lock fileA
 - inode_lock fileB

We may encounter above potential deadlock during moving file range in
concurrent scenario. This patch fixes the issue by using inode_trylock
instead.

Signed-off-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Chao Yu authored and Jaegeuk Kim committed 2016-08-19 11:15:08 +09:00
1 parent fe8494bfc8
commit 20a3d61d46
1 file changed
+7 -2
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fs/f2fs/file.c
+7 -2
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@@ -2093,8 +2093,12 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
return -EOPNOTSUPP;
inode_lock(src);
if (src != dst)
inode_lock(dst);
if (src != dst) {
if (!inode_trylock(dst)) {
ret = -EBUSY;
goto out;
}
}
ret = -EINVAL;
if (pos_in + len > src->i_size || pos_in + len < pos_in)
@@ -2152,6 +2156,7 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
out_unlock:
if (src != dst)
inode_unlock(dst);
out:
inode_unlock(src);
return ret;
}