afs: Fix directory format encoding struct

JIRA: https://issues.redhat.com/browse/RHEL-78388

commit 07a1076
Author: David Howells <dhowells@redhat.com>
Date:   Mon Dec 16 20:41:03 2024 +0000

    afs: Fix directory format encoding struct

    The AFS directory format structure, union afs_xdr_dir_block::meta, has too
	many alloc counter slots declared and so pushes the hash table along and
    over the data.  This doesn't cause a problem at the moment because I'm
    currently ignoring the hash table and only using the correct number of
    alloc_ctrs in the code anyway.  In future, however, I should start using
    the hash table to try and speed up afs_lookup().

    Fix this by using the correct constant to declare the counter array.

    Fixes: 4ea219a ("afs: Split the directory content defs into a header")
    Signed-off-by: David Howells <dhowells@redhat.com>
    Link: https://lore.kernel.org/r/20241216204124.3752367-14-dhowells@redhat.com
    cc: Marc Dionne <marc.dionne@auristor.com>
    cc: linux-afs@lists.infradead.org
    Signed-off-by: Christian Brauner <brauner@kernel.org>

Signed-off-by: Marc Dionne <mdionne@redhat.com>

Author: mdionne

fs/afs/xdr_fs.h

@@ -88,7 +88,7 @@ union afs_xdr_dir_block {
 
 	struct {
 		struct afs_xdr_dir_hdr	hdr;
-		u8			alloc_ctrs[AFS_DIR_MAX_BLOCKS];
+		u8			alloc_ctrs[AFS_DIR_BLOCKS_WITH_CTR];
 		__be16			hashtable[AFS_DIR_HASHTBL_SIZE];
 	} meta;