linux-kernel - [PATCH 08/27] GFS2: Fix case where reservation finished at end of rgrp

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Date:	Wed, 26 Sep 2012 09:25:29 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 08/27] GFS2: Fix case where reservation finished at end of rgrp

One corner case which the original patch failed to take into
account was when there is a reservation which ended such that
the following block was one beyond the end of the rgrp in
question. This extra test fixes that case.

Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Reported-by: Bob Peterson <rpeterso@...hat.com>
Tested-by: Bob Peterson <rpeterso@...hat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 7ce22d8..c17029a 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1596,6 +1596,12 @@ find_next:
 			n += (rbm->bi - initial_bi);
 			goto find_next;
 		}
+		if (ret == -E2BIG) {
+			index = 0;
+			rbm->offset = 0;
+			n += (rbm->bi - initial_bi);
+			goto res_covered_end_of_rgrp;
+		}
 		return ret;
 
 bitmap_full:	/* Mark bitmap as full and fall through */
@@ -1608,6 +1614,7 @@ next_bitmap:	/* Find next bitmap in the rgrp */
 		index++;
 		if (index == rbm->rgd->rd_length)
 			index = 0;
+res_covered_end_of_rgrp:
 		rbm->bi = &rbm->rgd->rd_bits[index];
 		if ((index == 0) && nowrap)
 			break;
-- 
1.7.4

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