[XFS] simplify xfs_lookup

Opencode xfs-kill-xfs_dir_lookup_int here, which gets rid of a lock
roundtrip, and lots of stack space. Also kill the di_mode == 0 check that
has been done in xfs_iget for a few years now.

SGI-PV: 976035
SGI-Modid: xfs-linux-melb:xfs-kern:30901a

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

1 files changed, 15 insertions, 7 deletions

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 7093d749589b..637fc1a2bb44 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -1636,8 +1636,7 @@ xfs_lookup(
         struct xfs_name         *name,
         xfs_inode_t             **ipp)
 {
-        xfs_inode_t             *ip;
-        xfs_ino_t               e_inum;
+        xfs_ino_t               inum;
         int                     error;
         uint                    lock_mode;
 
@@ -1647,12 +1646,21 @@ xfs_lookup(
                 return XFS_ERROR(EIO);
 
         lock_mode = xfs_ilock_map_shared(dp);
-        error = xfs_dir_lookup_int(dp, lock_mode, name, &e_inum, &ip);
-        if (!error) {
-                *ipp = ip;
-                xfs_itrace_ref(ip);
-        }
+        error = xfs_dir_lookup(NULL, dp, name, &inum);
         xfs_iunlock_map_shared(dp, lock_mode);
+
+        if (error)
+                goto out;
+
+        error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp, 0);
+        if (error)
+                goto out;
+
+        xfs_itrace_ref(*ipp);
+        return 0;
+
+ out:
+        *ipp = NULL;
         return error;
 }