vfs: don't use PARENT/CHILD lock classes for non-directories
Reserve I_MUTEX_PARENT and I_MUTEX_CHILD for locking of actual
directories.
(Also I_MUTEX_QUOTA isn't really a meaningful name for this locking
class any more; fixed in a later patch.)
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/inode.c b/fs/inode.c
index ef25afd..51f329b 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -951,16 +951,16 @@
{
WARN_ON_ONCE(S_ISDIR(inode1->i_mode));
if (inode1 == inode2 || !inode2) {
- mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
+ mutex_lock(&inode1->i_mutex);
return;
}
WARN_ON_ONCE(S_ISDIR(inode2->i_mode));
if (inode1 < inode2) {
- mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
- mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
+ mutex_lock(&inode1->i_mutex);
+ mutex_lock_nested(&inode2->i_mutex, I_MUTEX_QUOTA);
} else {
- mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
- mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
+ mutex_lock(&inode2->i_mutex);
+ mutex_lock_nested(&inode1->i_mutex, I_MUTEX_QUOTA);
}
}
EXPORT_SYMBOL(lock_two_nondirectories);