6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Trond Myklebust trond.myklebust@hammerspace.com
[ Upstream commit 8675c69816e4276b979ff475ee5fac4688f80125 ]
When a filesystem is being automounted, it needs to preserve the user-set superblock mount options, such as the "ro" flag.
Reported-by: Li Lingfeng lilingfeng3@huawei.com Link: https://lore.kernel.org/all/20240604112636.236517-3-lilingfeng@huaweicloud.c... Fixes: f2aedb713c28 ("NFS: Add fs_context support.") Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/namespace.c | 6 ++++++ fs/nfs/super.c | 4 ---- 2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c index e7494cdd957e5..40d7163bca870 100644 --- a/fs/nfs/namespace.c +++ b/fs/nfs/namespace.c @@ -149,6 +149,7 @@ struct vfsmount *nfs_d_automount(struct path *path) struct vfsmount *mnt = ERR_PTR(-ENOMEM); struct nfs_server *server = NFS_SB(path->dentry->d_sb); struct nfs_client *client = server->nfs_client; + unsigned long s_flags = path->dentry->d_sb->s_flags; int timeout = READ_ONCE(nfs_mountpoint_expiry_timeout); int ret;
@@ -174,6 +175,11 @@ struct vfsmount *nfs_d_automount(struct path *path) fc->net_ns = get_net(client->cl_net); }
+ /* Inherit the flags covered by NFS_SB_MASK */ + fc->sb_flags_mask |= NFS_SB_MASK; + fc->sb_flags &= ~NFS_SB_MASK; + fc->sb_flags |= s_flags & NFS_SB_MASK; + /* for submounts we want the same server; referrals will reassign */ memcpy(&ctx->nfs_server._address, &client->cl_addr, client->cl_addrlen); ctx->nfs_server.addrlen = client->cl_addrlen; diff --git a/fs/nfs/super.c b/fs/nfs/super.c index e1bcad5906ae7..2115b0d8ccae7 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1284,10 +1284,6 @@ int nfs_get_tree_common(struct fs_context *fc) if (server->flags & NFS_MOUNT_NOAC) fc->sb_flags |= SB_SYNCHRONOUS;
- if (ctx->clone_data.sb) - if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) - fc->sb_flags |= SB_SYNCHRONOUS; - /* Get a superblock - note that we may end up sharing one that already exists */ fc->s_fs_info = server; s = sget_fc(fc, compare_super, nfs_set_super);