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-rw-r--r--fs/namei.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 2a5a7aa..88cec03 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3918,7 +3918,8 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
* That's where 4.4 screws up. Current fix: serialization on
* sb->s_vfs_rename_mutex. We might be more accurate, but that's another
* story.
- * c) we have to lock _three_ objects - parents and victim (if it exists).
+ * c) we have to lock _four_ objects - parents and victim (if it exists),
+ * and source (if it is not a directory).
* And that - after we got ->i_mutex on parents (until then we don't know
* whether the target exists). Solution: try to be smart with locking
* order for inodes. We rely on the fact that tree topology may change
@@ -3994,6 +3995,7 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct inode *target = new_dentry->d_inode;
+ struct inode *source = old_dentry->d_inode;
int error;
error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
@@ -4001,8 +4003,7 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
return error;
dget(new_dentry);
- if (target)
- mutex_lock(&target->i_mutex);
+ lock_two_nondirectories(source, target);
error = -EBUSY;
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
@@ -4017,8 +4018,7 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry, new_dentry);
out:
- if (target)
- mutex_unlock(&target->i_mutex);
+ unlock_two_nondirectories(source, target);
dput(new_dentry);
return error;
}
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