kill-the-bkl/reiserfs: acquire the inode mutex safely

While searching a pathname, an inode mutex can be acquired
in do_lookup() which calls reiserfs_lookup() which in turn
acquires the write lock.

On the other side reiserfs_fill_super() can acquire the write_lock
and then call reiserfs_lookup_privroot() which can acquire an
inode mutex (the root of the mount point).

So we theoretically risk an AB - BA lock inversion that could lead
to a deadlock.

As for other lock dependencies found since the bkl to mutex
conversion, the fix is to use reiserfs_mutex_lock_safe() which
drops the lock dependency to the write lock.

[ Impact: fix a possible deadlock with reiserfs ]

Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 6925b835a43b..59870a4751cc 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -975,7 +975,7 @@ int reiserfs_lookup_privroot(struct super_block *s)
         int err = 0;
 
         /* If we don't have the privroot located yet - go find it */
-        mutex_lock(&s->s_root->d_inode->i_mutex);
+        reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
         dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
                                 strlen(PRIVROOT_NAME));
         if (!IS_ERR(dentry)) {
@@ -1011,7 +1011,7 @@ int reiserfs_xattr_init(struct super_block *s, int mount_flags)
 
         if (privroot->d_inode) {
                 s->s_xattr = reiserfs_xattr_handlers;
-                mutex_lock(&privroot->d_inode->i_mutex);
+                reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s);
                 if (!REISERFS_SB(s)->xattr_root) {
                         struct dentry *dentry;
                         dentry = lookup_one_len(XAROOT_NAME, privroot,