afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY

Mark a superblock that is for for an R/O or Backup volume as SB_RDONLY when
mounting it.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

diff --git a/fs/afs/super.c b/fs/afs/super.c
index e95fb4cb4fcd23d9c3635684171c9f1ba996a791..a01a0fb2cdbb5c472def4f5352a0ba3ced962cd1 100644 (file)
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -407,8 +407,10 @@ static int afs_validate_fc(struct fs_context *fc)
                        return PTR_ERR(volume);
 
                ctx->volume = volume;
-               if (volume->type != AFSVL_RWVOL)
+               if (volume->type != AFSVL_RWVOL) {
                        ctx->flock_mode = afs_flock_mode_local;
+                       fc->sb_flags |= SB_RDONLY;
+               }
        }
 
        return 0;