[GFS2] Clean up inode number handling

This patch cleans up the inode number handling code. The main difference
is that instead of looking up the inodes using a struct gfs2_inum_host
we now use just the no_addr member of this structure. The tests relating
to no_formal_ino can then be done by the calling code. This has
advantages in that we want to do different things in different code
paths if the no_formal_ino doesn't match. In the NFS patch we want to
return -ESTALE, but in the ->lookup() path, its a bug in the fs if the
no_formal_ino doesn't match and thus we can withdraw in this case.

In order to later fix bz #201012, we need to be able to look up an inode
without knowing no_formal_ino, as the only information that is known to
us is the on-disk location of the inode in question.

This patch will also help us to fix bz #236099 at a later date by
cleaning up a lot of the code in that area.

There are no user visible changes as a result of this patch and there
are no changes to the on-disk format either.

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

1 files changed, 2 insertions, 9 deletions

diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index 8b7e4c1e32a..a82ec8c62ef 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -59,13 +59,6 @@ struct gfs2_inum_host {
 	__u64 no_addr;
 };
 
-static inline int gfs2_inum_equal(const struct gfs2_inum_host *ino1,
-				  const struct gfs2_inum_host *ino2)
-{
-	return ino1->no_formal_ino == ino2->no_formal_ino &&
-	       ino1->no_addr == ino2->no_addr;
-}
-
 /*
  * Generic metadata head structure
  * Every inplace buffer logged in the journal must start with this.
@@ -509,9 +502,9 @@ struct gfs2_quota_change_host {
 
 #ifdef __KERNEL__
 /* Translation functions */
+struct gfs2_inode;
 
-extern void gfs2_inum_in(struct gfs2_inum_host *no, const void *buf);
-extern void gfs2_inum_out(const struct gfs2_inum_host *no, void *buf);
+extern void gfs2_inum_out(const struct gfs2_inode *ip, struct gfs2_dirent *dent);
 extern void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf);
 extern void gfs2_rindex_in(struct gfs2_rindex_host *ri, const void *buf);
 extern void gfs2_rindex_out(const struct gfs2_rindex_host *ri, void *buf);