[Ocfs2-devel] [PATCH] ocfs2: Solve a problem of crossing the boundary in updating backups

[Ocfs2-devel] [PATCH] ocfs2: Solve a problem of crossing the boundary in updating backups

[jiangyiwen]

In update_backups func, it 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 is happened.

Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
---
 fs/ocfs2/resize.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c
index d5da6f6..10ad87b 100644
--- a/fs/ocfs2/resize.c
+++ b/fs/ocfs2/resize.c
@@ -187,7 +187,7 @@ 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);
-- 
1.8.4.3

[Ocfs2-devel] [PATCH] ocfs2: Solve a problem of crossing the boundary in updating backups

[Joseph Qi]

On 2015/10/5 11:50, jiangyiwen wrote:
> In update_backups func, it 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 is happened.
> 
> Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
> ---
>  fs/ocfs2/resize.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c
> index d5da6f6..10ad87b 100644
> --- a/fs/ocfs2/resize.c
> +++ b/fs/ocfs2/resize.c
> @@ -187,7 +187,7 @@ 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);
>