befs: add check for ag_shift in superblock

ag_shift and blocks_per_ag contain the same information in different ways,
same as block_shift and block_size do. It is worth checking this two are
consistent, but since blocks_per_ag isn't documented as mandatory to use
some implementations of befs don't enforce this, so making it non-fatal if
they don't match and just having it as a warning.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Salah Triki <salah.triki@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/befs/super.c b/fs/befs/super.c
index dc13df8de3e8..c36745d2b45f 100644
--- a/fs/befs/super.c
+++ b/fs/befs/super.c
@@ -103,6 +103,13 @@ befs_check_sb(struct super_block *sb)
                 return BEFS_ERR;
         }
 
+
+        /* ag_shift also encodes the same information as blocks_per_ag in a
+         * different way, non-fatal consistency check
+         */
+        if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)
+                befs_error(sb, "ag_shift disagrees with blocks_per_ag.");
+
         if (befs_sb->log_start != befs_sb->log_end || befs_sb->flags == BEFS_DIRTY) {
                 befs_error(sb, "Filesystem not clean! There are blocks in the "
                            "journal. You must boot into BeOS and mount this volume "