[RFC][PATCH] Mount problem with the GFS2 code

[Srinivasa Ds <srinivasa@in.ibm.com>]

Hi all
 While mounting the gfs2 filesystem,our test team had a problem and we 
got this error message.
=======================================================

GFS2: fsid=: Trying to join cluster "lock_nolock", "dasde1"
GFS2: fsid=dasde1.0: Joined cluster. Now mounting FS...
GFS2: not a GFS2 filesystem
GFS2: fsid=dasde1.0: can't read superblock: -22

==========================================================================
On debugging further we found that problem is while reading the super 
block(gfs2_read_super) and comparing the magic number in it.
When I  replace the submit_bio() call(present in gfs2_read_super) with 
the sb_getblk() and ll_rw_block(), mount operation succeded.
On further analysis we found that before calling submit_bio(), 
bio->bi_sector was set to "sector" variable. This "sector" variable has 
the same value of bh->b_blocknr(block number). Hence there is a need to 
multiply this valuwith (blocksize >> 9)(9 because,sector size 
2^9,samething happens in ll_rw_block also, before calling submit_bio()).
So I have developed the patch which solves this problem. Please let me 
know your comments.
================================================================

Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>


 super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.19-rc6/fs/gfs2/super.c
===================================================================
--- linux-2.6.19-rc6.orig/fs/gfs2/super.c
+++ linux-2.6.19-rc6/fs/gfs2/super.c
@@ -199,7 +199,7 @@ struct page *gfs2_read_super(struct supe
 		return NULL;
 	}
 
-	bio->bi_sector = sector;
+	bio->bi_sector = sector * (sb->s_blocksize >> 9);
 	bio->bi_bdev = sb->s_bdev;
 	bio_add_page(bio, page, PAGE_SIZE, 0);