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NFS: Fix the setting of capabilities when automounting a new filesystem

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[ Upstream commit b01f21cacde9f2878492cf318fee61bf4ccad323 ]

Capabilities cannot be inherited when we cross into a new filesystem.
They need to be reset to the minimal defaults, and then probed for
again.

Fixes: 54ceac4515 ("NFS: Share NFS superblocks per-protocol per-server per-FSID")
Cc: stable@vger.kernel.org
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[ adapted to older fs_context-less API structures ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2025-08-16 22:28:12 -04:00 • committed by Greg Kroah-Hartman
commit 95eb0d97ab
4 changed files with 44 additions and 16 deletions
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44
fs/nfs/client.c
View file

@ -646,6 +646,42 @@ struct nfs_client *nfs_init_client(struct nfs_client *clp,
}
EXPORT_SYMBOL_GPL(nfs_init_client);
static void nfs4_server_set_init_caps(struct nfs_server *server)
{
#if IS_ENABLED(CONFIG_NFS_V4)
/* Set the basic capabilities */
server->caps = server->nfs_client->cl_mvops->init_caps;
if (server->flags & NFS_MOUNT_NORDIRPLUS)
server->caps &= ~NFS_CAP_READDIRPLUS;
/*
* Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
* authentication.
*/
if (nfs4_disable_idmapping &&
server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
server->caps |= NFS_CAP_UIDGID_NOMAP;
#endif
}
void nfs_server_set_init_caps(struct nfs_server *server)
{
switch (server->nfs_client->rpc_ops->version) {
case 2:
server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
break;
case 3:
server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
if (!(server->flags & NFS_MOUNT_NORDIRPLUS))
server->caps |= NFS_CAP_READDIRPLUS;
break;
default:
nfs4_server_set_init_caps(server);
break;
}
}
EXPORT_SYMBOL_GPL(nfs_server_set_init_caps);
/*
* Create a version 2 or 3 client
*/
@ -683,9 +719,6 @@ static int nfs_init_server(struct nfs_server *server,
/* Initialise the client representation from the mount data */
server->flags = data->flags;
server->options = data->options;
server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
if (data->rsize)
server->rsize = nfs_block_size(data->rsize, NULL);
@ -710,6 +743,8 @@ static int nfs_init_server(struct nfs_server *server,
if (error < 0)
goto error;
nfs_server_set_init_caps(server);
/* Preserve the values of mount_server-related mount options */
if (data->mount_server.addrlen) {
memcpy(&server->mountd_address, &data->mount_server.address,
@ -834,7 +869,6 @@ void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *sour
target->acregmax = source->acregmax;
target->acdirmin = source->acdirmin;
target->acdirmax = source->acdirmax;
target->caps = source->caps;
target->options = source->options;
target->auth_info = source->auth_info;
target->port = source->port;
@ -1042,6 +1076,8 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
if (error < 0)
goto out_free_server;
nfs_server_set_init_caps(server);
/* probe the filesystem info for this server filesystem */
error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
if (error < 0)

1
fs/nfs/internal.h
View file

@ -172,6 +172,7 @@ nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
struct nfs4_sessionid *, u32);
extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
struct nfs_subversion *);
extern void nfs_server_set_init_caps(struct nfs_server *);
extern struct nfs_server *nfs4_create_server(
struct nfs_mount_info *,
struct nfs_subversion *);

13
fs/nfs/nfs4client.c
View file

@ -1011,18 +1011,7 @@ static int nfs4_server_common_setup(struct nfs_server *server,
if (error < 0)
goto out;
/* Set the basic capabilities */
server->caps |= server->nfs_client->cl_mvops->init_caps;
if (server->flags & NFS_MOUNT_NORDIRPLUS)
server->caps &= ~NFS_CAP_READDIRPLUS;
/*
* Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
* authentication.
*/
if (nfs4_disable_idmapping &&
server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
server->caps |= NFS_CAP_UIDGID_NOMAP;
nfs_server_set_init_caps(server);
/* Probe the root fh to retrieve its FSID and filehandle */
error = nfs4_get_rootfh(server, mntfh, auth_probe);

2
fs/nfs/nfs4proc.c
View file

@ -3884,6 +3884,8 @@ int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
.interruptible = true,
};
int err;
nfs_server_set_init_caps(server);
do {
err = nfs4_handle_exception(server,
_nfs4_server_capabilities(server, fhandle),