From: jiangyiwen <jiangyi...@huawei.com>
Subject: ocfs2: solve a problem of crossing the boundary in updating backups
In update_backups() there exists a problem of crossing the boundary
as follows:
we assume that lun will be resized to 1TB(cluster_size is 32kb),
it will include 0~33554431 cluster, in update_backups func,
it will backup super block in location of 1TB which is the 33554432th
cluster, so the phenomenon of crossing the boundary happens.
Signed-off-by: Yiwen Jiang <jiangyi...@huawei.com>
Reviewed-by: Joseph Qi <joseph...@huawei.com>
Cc: Xue jiufei <xuejiu...@huawei.com>
Cc: Mark Fasheh <mfas...@suse.de>
Cc: Joel Becker <jl...@evilplan.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
fs/ocfs2/resize.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN
fs/ocfs2/resize.c~ocfs2-solve-a-problem-of-crossing-the-boundary-in-updating-backups
fs/ocfs2/resize.c
---
a/fs/ocfs2/resize.c~ocfs2-solve-a-problem-of-crossing-the-boundary-in-updating-backups
+++ a/fs/ocfs2/resize.c
@@ -196,7 +196,7 @@ static int update_backups(struct inode *
for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
- if (cluster > clusters)
+ if (cluster >= clusters)
break;
ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
_
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