Commit 0da3585e authored Nov 30, 2006 by Srinivasa Ds Committed by Steven Whitehouse Nov 30, 2006

[GFS2] Mount problem with the GFS2 code



  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>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

parent 77386e1f

fs/gfs2/super.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -199,7 +199,7 @@ struct page gfs2_read_super(struct super_block sb, sector_t sector)
		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);

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