xfs: asserting lock not held during freeing not valid

When we free an inode, we do so via RCU. As an RCU lookup can occur
at any time before we free an inode, and that lookup takes the inode
flags lock, we cannot safely assert that the flags lock is not held
just before marking it dead and running call_rcu() to free the
inode.

We check on allocation of a new inode structre that the lock is not
held, so we still have protection against locks being leaked and
hence not correctly initialised when allocated out of the slab.
Hence just remove the assert...

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 193206ba43582c0aecbea7afd1d23220bfff554f..474807a401c864e7681d3f8d0f111358c45536fc 100644 (file)
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -119,11 +119,6 @@ xfs_inode_free(
                ip->i_itemp = NULL;
        }
 
-       /* asserts to verify all state is correct here */
-       ASSERT(atomic_read(&ip->i_pincount) == 0);
-       ASSERT(!spin_is_locked(&ip->i_flags_lock));
-       ASSERT(!xfs_isiflocked(ip));
-
        /*
         * Because we use RCU freeing we need to ensure the inode always
         * appears to be reclaimed with an invalid inode number when in the
@@ -135,6 +130,10 @@ xfs_inode_free(
        ip->i_ino = 0;
        spin_unlock(&ip->i_flags_lock);
 
+       /* asserts to verify all state is correct here */
+       ASSERT(atomic_read(&ip->i_pincount) == 0);
+       ASSERT(!xfs_isiflocked(ip));
+
        call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
 }