Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/ZLEXRJSZCFU6YYEWJWQ5CUFFOYGNQ34K/ 
When NFS_MOUNT_UNSHARED is not set, NFS forces the sharing of a
superblock among each filesystem that mounts sub-directories elonging to
a single exported root path.

To prevent interference between different filesystems, ignore SB_RDONLY
when mounting and remounting nfs.

Li Lingfeng (2):
  nfs: clear SB_RDONLY before getting superblock
  nfs: ignore SB_RDONLY when remounting nfs

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Changes in v2:
- Change the bugzilla tag to the gitee link.
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https://gitee.com/openeuler/kernel/issues/IB42W1 
 
Link:https://gitee.com/openeuler/kernel/pulls/15411

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Yuan Can <yuancan@huawei.com>
Signed-off-by: Yuan Can <yuancan@huawei.com>