[PATCH] reiserfs: fix is_reusable bitmap check to not traverse the bitmap info array

There is a check in is_reusable to determine if a particular block is a bitmap
block.  It verifies this by going through the array of bitmap block buffer
heads and comparing the block number to each one.

Bitmap blocks are at defined locations on the disk in both old and current
formats.  Simply checking against the known good values is enough.

This is a trivial optimization for a non-production codepath, but this is the
first in a series of patches that will ultimately remove the buffer heads from
that array.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 80fc3b32802f..db2c581df766 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1818,6 +1818,8 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
         if (is_reiserfs_3_5(rs)
             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
                 set_bit(REISERFS_3_5, &(sbi->s_properties));
+        else if (old_format)
+                set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
         else
                 set_bit(REISERFS_3_6, &(sbi->s_properties));