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authorDavid Chinner <david@fromorbit.com>2008-09-17 16:51:21 +1000
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-09-17 16:51:21 +1000
commitf9114eba1eb08ee75fd0f1eee780f0290fb3c043 (patch)
treecfdb27e38eb600f84a4278744b19e1576ca5e7d3 /fs/xfs/xfs_vnodeops.c
parentb5b8c9acd547244eb2b7d0280ba38b9dd01971cc (diff)
downloadlinux-f9114eba1eb08ee75fd0f1eee780f0290fb3c043.tar.bz2
[XFS] Prevent lockdep false positives when locking two inodes.
If we call xfs_lock_two_inodes() to grab both the iolock and the ilock, then drop the ilocks on both inodes, then grab them again (as xfs_swap_extents() does) then lockdep will report a locking order problem. This is a false positive. To avoid this, disallow xfs_lock_two_inodes() fom locking both inode locks at once - force calers to make two separate calls. This means that nested dropping and regaining of the ilocks will retain the same lockdep subclass and so lockdep will not see anything wrong with this code. SGI-PV: 986238 SGI-Modid: xfs-linux-melb:xfs-kern:31999a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Peter Leckie <pleckie@sgi.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_vnodeops.c')
-rw-r--r--fs/xfs/xfs_vnodeops.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index aa238c8fbd7a..98a0aecafddc 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -1838,6 +1838,12 @@ again:
#endif
}
+/*
+ * xfs_lock_two_inodes() can only be used to lock one type of lock
+ * at a time - the iolock or the ilock, but not both at once. If
+ * we lock both at once, lockdep will report false positives saying
+ * we have violated locking orders.
+ */
void
xfs_lock_two_inodes(
xfs_inode_t *ip0,
@@ -1848,6 +1854,8 @@ xfs_lock_two_inodes(
int attempts = 0;
xfs_log_item_t *lp;
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
ASSERT(ip0->i_ino != ip1->i_ino);
if (ip0->i_ino > ip1->i_ino) {