Commit 584dca34 authored Mar 25, 2016 by jiangyiwen Committed by Linus Torvalds Mar 25, 2016

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 <jiangyiwen@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Xue jiufei <xuejiufei@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 35ddf78e

fs/ocfs2/resize.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -196,7 +196,7 @@ static int update_backups(struct inode * inode, u32 clusters, char *data)
		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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