[XFS] keep i_nlink updated and use proper accessors

To get the read-only bind mounts in -mm to work correctly with XFS we need
to call the drop_nlink and inc_nlink helpers to monitor the link count.
Add calls to these to xfs_bumplink and xfs_droplink and stop copying over
di_nlink to i_nlink in xfs_validate_fields and vn_revalidate.

SGI-PV: 971186
SGI-Modid: xfs-linux-melb:xfs-kern:30392a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/xfs/xfs_utils.c b/fs/xfs/xfs_utils.c
index 4df466fa3a40..45d740df53b7 100644
--- a/fs/xfs/xfs_utils.c
+++ b/fs/xfs/xfs_utils.c
@@ -302,6 +302,7 @@ xfs_droplink(
 
         ASSERT (ip->i_d.di_nlink > 0);
         ip->i_d.di_nlink--;
+        drop_nlink(ip->i_vnode);
         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 
         error = 0;
@@ -365,6 +366,7 @@ xfs_bumplink(
 
         ASSERT(ip->i_d.di_nlink > 0);
         ip->i_d.di_nlink++;
+        inc_nlink(ip->i_vnode);
         if ((ip->i_d.di_version == XFS_DINODE_VERSION_1) &&
             (ip->i_d.di_nlink > XFS_MAXLINK_1)) {
                 /*