hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IB42W1
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During the process of mounting an NFSv4 client, two superblocks will be created in sequence. The first superblock corresponds to the root directory exported by the server, and the second superblock corresponds to the directory that will be actually mounted. The first superblock will eventually be destroyed. The flag passed from user mode will only be passed to the first superblock, resulting in the actual used superblock not carrying the flag passed from user mode(fs_context_for_submount() will set sb_flags as 0).
Since the superblock of NFS does not carry the ro tag, the file system status displayed by /proc/self/mountstats shows that NFS is always in the rw state, which may mislead users.
Pass sb_flags of the fc which carry flags passed by user to second superblock to fix it.
Fixes: 281cad46b34d ("NFS: Create a submount rpc_op") Signed-off-by: Li Lingfeng lilingfeng3@huawei.com --- fs/nfs/nfs4super.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c index d09bcfd7db89..bb13894ad152 100644 --- a/fs/nfs/nfs4super.c +++ b/fs/nfs/nfs4super.c @@ -209,6 +209,7 @@ static int do_nfs4_mount(struct nfs_server *server, if (IS_ERR(dentry)) return PTR_ERR(dentry);
+ dentry->d_sb->s_flags = fc->sb_flags; fc->root = dentry; return 0; }