From: Steven Whitehouse <swhiteho@redhat.com>
Date: Tue, 7 Aug 2012 12:47:12 +0000 (+0100)
Subject: GFS2: Fix case where reservation finished at end of rgrp
X-Git-Tag: upstream/snapshot3+hdmi~6626^2~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5d50d5324612d28c47b9361e5424f13a19c888cd;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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@redhat.com>
Reported-by: Bob Peterson <rpeterso@redhat.com>
Tested-by: Bob Peterson <rpeterso@redhat.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;