[GFS2] Fix bug in directory code and tidy up

Due to a typo, the dir leaf split operation was (for the first
split in a directory) writing the new hash vaules at the
wrong offset. This is now fixed.

Also some other tidy ups are included:

 - We use GFS2's hash function for dentries (see ops_dentry.c) so that
   we don't have to keep recalculating the hash values.
 - A lot of common code is eliminated between the various directory
   lookup routines.
 - Better error checking on directory lookup (previously different
   routines checked for different errors)
 - The leaf split operation has a couple of redundant operations
   removed from it, so it should be faster.

There is still further scope for further clean ups in the directory
code, and readdir in particular could do with slimming down a bit.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 13 deletions

diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index c3fa6cfce16..0dd2a26626e 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -44,8 +44,8 @@ void gfs2_inode_destroy(struct gfs2_inode *ip);
 int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul);
 
 int gfs2_change_nlink(struct gfs2_inode *ip, int diff);
-int gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
-		 struct inode **ipp);
+struct inode *gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
+			   struct nameidata *nd);
 struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name,
 			   unsigned int mode);
 int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
@@ -66,17 +66,7 @@ int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
 
 int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd);
 
-static inline int gfs2_lookup_simple(struct inode *dip, char *name,
-				     struct inode **ipp)
-{
-	struct qstr qstr;
-	int err;
-	memset(&qstr, 0, sizeof(struct qstr));
-	qstr.name = name;
-	qstr.len = strlen(name);
-	err = gfs2_lookupi(dip, &qstr, 1, ipp);
-	return err;
-}
+struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
 
 #endif /* __INODE_DOT_H__ */