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authorDave Chinner <dchinner@redhat.com>2013-09-24 16:01:14 +1000
committerBen Myers <bpm@sgi.com>2013-09-24 12:32:57 -0500
commitb313a5f1cb0bf3276d5457b52b9f75a940e7b5e9 (patch)
tree141a0a2764099ed5dfb31ea40324433fcfded028 /fs
parent4885235806bb95c3fad5a5238e323cb746c3a49b (diff)
downloadop-kernel-dev-b313a5f1cb0bf3276d5457b52b9f75a940e7b5e9.zip
op-kernel-dev-b313a5f1cb0bf3276d5457b52b9f75a940e7b5e9.tar.gz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_icache.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 193206b..474807a 100644
--- 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);
}
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