ocfs2: limit cluster bitmap information saved at mount

We were storing cluster count on the ocfs2_super structure, but never
actually using it so remove that. Also, we don't want to populate the
uptodate cache with the unlocked block read - it is technically safe as is,
but we should change it for correctness.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index cd4a6f253d13..d52100d49b6c 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -197,7 +197,6 @@ struct ocfs2_super
         struct ocfs2_node_map recovery_map;
         struct ocfs2_node_map umount_map;
 
-        u32 num_clusters;
         u64 root_blkno;
         u64 system_dir_blkno;
         u64 bitmap_blkno;
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 382706a67ffd..d17e33e66a1e 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1442,8 +1442,13 @@ static int ocfs2_initialize_super(struct super_block *sb,
 
         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
 
+        /* We don't have a cluster lock on the bitmap here because
+         * we're only interested in static information and the extra
+         * complexity at mount time isn't worht it. Don't pass the
+         * inode in to the read function though as we don't want it to
+         * be put in the cache. */
         status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
-                                  inode);
+                                  NULL);
         iput(inode);
         if (status < 0) {
                 mlog_errno(status);
@@ -1452,7 +1457,6 @@ static int ocfs2_initialize_super(struct super_block *sb,
 
         di = (struct ocfs2_dinode *) bitmap_bh->b_data;
         osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
-        osb->num_clusters = le32_to_cpu(di->id1.bitmap1.i_total);
         brelse(bitmap_bh);
         mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
              (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);