linux-kernel - [RFC][PATCH] Mount problem with the GFS2 code

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Date:	Thu, 30 Nov 2006 15:04:55 +0530
From:	Srinivasa Ds <srinivasa@...ibm.com>
To:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>, swhiteho@...hat.com,
	fabbione@...ntu.com, bunk@...sta.de, aarora@...ux.vnet.ibm.com,
	aarora@...ibm.com
Subject: [RFC][PATCH] Mount problem with the GFS2 code

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@...ibm.com>

View attachment "gfs2.fix" of type "text/plain" (489 bytes)