[PATCH 9/9] NFS: Support the mount context and fsopen()

From: David Howells
Date: Wed May 03 2017 - 12:06:27 EST

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Support the fsopen() system call in NFS, parsing the options and filling in
an nfs_parsed_mount_data struct attached to the mount_context struct. For
example:

mfd = fsopen("nfs4", -1, 0);
E_write(mfd, "d warthog:/root");
E_write(mfd, "o fsc");
E_write(mfd, "o sync");
E_write(mfd, "o intr");
E_write(mfd, "o foo");

Where E_write() is a wrapper around write() that determines the string
length and, if an error occurs, will read() back the error message and
print it.

A future patch will add the actual mounting part.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

fs/nfs/Makefile | 2
fs/nfs/client.c | 18
fs/nfs/internal.h | 127 ++-
fs/nfs/mount.c | 1539 ++++++++++++++++++++++++++++++++++++++++++
fs/nfs/namespace.c | 75 +-
fs/nfs/nfs3_fs.h | 2
fs/nfs/nfs3client.c | 6
fs/nfs/nfs3proc.c | 1
fs/nfs/nfs4_fs.h | 4
fs/nfs/nfs4client.c | 80 +-
fs/nfs/nfs4namespace.c | 207 ++++--
fs/nfs/nfs4proc.c | 1
fs/nfs/nfs4super.c | 184 ++---
fs/nfs/proc.c | 1
fs/nfs/super.c | 1729 +++--------------------------------------------
include/linux/nfs_xdr.h | 7
16 files changed, 2035 insertions(+), 1948 deletions(-)
create mode 100644 fs/nfs/mount.c

diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 6abdda209642..655fd5e72e60 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_NFS_FS) += nfs.o
CFLAGS_nfstrace.o += -I$(src)
nfs-y := client.o dir.o file.o getroot.o inode.o super.o \
io.o direct.o pagelist.o read.o symlink.o unlink.o \
- write.o namespace.o mount_clnt.o nfstrace.o
+ write.o namespace.o mount_clnt.o nfstrace.o mount.o
nfs-$(CONFIG_ROOT_NFS) += nfsroot.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 04d15a0045e3..a40dafacdc2d 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -652,17 +652,16 @@ EXPORT_SYMBOL_GPL(nfs_init_client);
* Create a version 2 or 3 client
*/
static int nfs_init_server(struct nfs_server *server,
- const struct nfs_parsed_mount_data *data,
- struct nfs_subversion *nfs_mod)
+ const struct nfs_mount_context *data)
{
struct rpc_timeout timeparms;
struct nfs_client_initdata cl_init = {
.hostname = data->nfs_server.hostname,
.addr = (const struct sockaddr *)&data->nfs_server.address,
.addrlen = data->nfs_server.addrlen,
- .nfs_mod = nfs_mod,
+ .nfs_mod = data->nfs_mod,
.proto = data->nfs_server.protocol,
- .net = data->net,
+ .net = data->mc.net_ns,
.timeparms = &timeparms,
};
struct nfs_client *clp;
@@ -954,8 +953,7 @@ EXPORT_SYMBOL_GPL(nfs_free_server);
* Create a version 2 or 3 volume record
* - keyed on server and FSID
*/
-struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs_create_server(struct nfs_mount_context *ctx)
{
struct nfs_server *server;
struct nfs_fattr *fattr;
@@ -971,18 +969,18 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
goto error;

/* Get a client representation */
- error = nfs_init_server(server, mount_info->parsed, nfs_mod);
+ error = nfs_init_server(server, ctx);
if (error < 0)
goto error;

/* Probe the root fh to retrieve its FSID */
- error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
+ error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
if (error < 0)
goto error;
if (server->nfs_client->rpc_ops->version == 3) {
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
- if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
+ if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
server->caps |= NFS_CAP_READDIRPLUS;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
@@ -990,7 +988,7 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
}

if (!(fattr->valid & NFS_ATTR_FATTR)) {
- error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
+ error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, fattr, NULL);
if (error < 0) {
dprintk("nfs_create_server: getattr error = %d\n", -error);
goto error;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 9dc65d7ae754..8575ed77ecd9 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -6,6 +6,7 @@
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/crc32.h>
+#include <linux/sunrpc/addr.h>
#include <linux/nfs_page.h>

#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
@@ -35,18 +36,6 @@ static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
return 1;
}

-struct nfs_clone_mount {
- const struct super_block *sb;
- const struct dentry *dentry;
- struct nfs_fh *fh;
- struct nfs_fattr *fattr;
- char *hostname;
- char *mnt_path;
- struct sockaddr *addr;
- size_t addrlen;
- rpc_authflavor_t authflavor;
-};
-
/*
* Note: RFC 1813 doesn't limit the number of auth flavors that
* a server can return, so make something up.
@@ -81,15 +70,27 @@ struct nfs_client_initdata {
const struct rpc_timeout *timeparms;
};

+enum nfs_mount_type {
+ NFS_MOUNT_ORDINARY,
+ NFS_MOUNT_CROSS_DEV,
+ NFS4_MOUNT_REMOTE,
+ NFS4_MOUNT_REFERRAL,
+ NFS4_MOUNT_REMOTE_REFERRAL,
+};
+
/*
* In-kernel mount arguments
*/
-struct nfs_parsed_mount_data {
- int flags;
+struct nfs_mount_context {
+ struct mount_context mc;
+ enum nfs_mount_type mount_type : 8;
+ bool skip_remount_option_check;
+ bool need_mount;
+ unsigned int flags; /* NFS{,4}_MOUNT_* flags */
unsigned int rsize, wsize;
unsigned int timeo, retrans;
- unsigned int acregmin, acregmax,
- acdirmin, acdirmax;
+ unsigned int acregmin, acregmax;
+ unsigned int acdirmin, acdirmax;
unsigned int namlen;
unsigned int options;
unsigned int bsize;
@@ -99,10 +100,14 @@ struct nfs_parsed_mount_data {
unsigned int version;
unsigned int minorversion;
char *fscache_uniq;
- bool need_mount;
+ unsigned short protofamily;
+ unsigned short mountfamily;

struct {
- struct sockaddr_storage address;
+ union {
+ struct sockaddr address;
+ struct sockaddr_storage _address;
+ };
size_t addrlen;
char *hostname;
u32 version;
@@ -111,16 +116,36 @@ struct nfs_parsed_mount_data {
} mount_server;

struct {
- struct sockaddr_storage address;
+ union {
+ struct sockaddr address;
+ struct sockaddr_storage _address;
+ };
size_t addrlen;
char *hostname;
char *export_path;
int port;
unsigned short protocol;
+ unsigned short export_path_len;
} nfs_server;

- struct security_mnt_opts lsm_opts;
- struct net *net;
+ struct nfs_fh *mntfh;
+ struct nfs_subversion *nfs_mod;
+
+ int (*set_security)(struct super_block *, struct dentry *,
+ struct nfs_mount_context *);
+
+ /* Information for a cloned mount. Possibly this should be either
+ * unioned with the information above or should be a separate
+ * mount_context derivative.
+ */
+ struct nfs_clone_mount {
+ struct super_block *sb;
+ struct dentry *dentry;
+ struct nfs_fattr *fattr;
+ bool cloned;
+ } clone_data;
+
+ char buf[32]; /* Parse buffer */
};

/* mount_clnt.c */
@@ -138,14 +163,6 @@ struct nfs_mount_request {
struct net *net;
};

-struct nfs_mount_info {
- int (*fill_super)(struct super_block *, struct nfs_mount_info *);
- int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
- struct nfs_parsed_mount_data *parsed;
- struct nfs_clone_mount *cloned;
- struct nfs_fh *mntfh;
-};
-
extern int nfs_mount(struct nfs_mount_request *info);
extern void nfs_umount(const struct nfs_mount_request *info);

@@ -171,13 +188,9 @@ extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
extern struct nfs_client *
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 struct nfs_server *nfs4_create_server(
- struct nfs_mount_info *,
- struct nfs_subversion *);
-extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
- struct nfs_fh *);
+extern struct nfs_server *nfs_create_server(struct nfs_mount_context *);
+extern struct nfs_server *nfs4_create_server(struct nfs_mount_context *);
+extern struct nfs_server *nfs4_create_referral_server(struct nfs_mount_context *);
extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
struct sockaddr *sap, size_t salen,
struct net *net);
@@ -229,6 +242,11 @@ extern struct svc_version nfs4_callback_version1;
extern struct svc_version nfs4_callback_version4;

struct nfs_pageio_descriptor;
+
+/* mount.c */
+extern const char nfs_slash[];
+extern struct dentry *nfs_general_mount(struct nfs_mount_context *ctx);
+
/* pagelist.c */
extern int __init nfs_init_nfspagecache(void);
extern void nfs_destroy_nfspagecache(void);
@@ -390,24 +408,13 @@ extern int nfs_wait_atomic_killable(atomic_t *p);
/* super.c */
extern const struct super_operations nfs_sops;
extern struct file_system_type nfs_fs_type;
-extern struct file_system_type nfs_xdev_fs_type;
-#if IS_ENABLED(CONFIG_NFS_V4)
-extern struct file_system_type nfs4_xdev_fs_type;
-extern struct file_system_type nfs4_referral_fs_type;
-#endif
bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
-struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
- struct nfs_subversion *);
-void nfs_initialise_sb(struct super_block *);
-int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
-int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
-struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
- struct nfs_mount_info *, struct nfs_subversion *);
-struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
-struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
- const char *, struct nfs_mount_info *);
+struct dentry *nfs_try_mount(struct nfs_mount_context *);
+int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_context *);
+int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_context *);
+struct dentry *nfs_fs_mount_common(struct nfs_server *, struct nfs_mount_context *);
void nfs_kill_super(struct super_block *);
-int nfs_fill_super(struct super_block *, struct nfs_mount_info *);
+int nfs_fill_super(struct super_block *, struct mount_context *);

extern struct rpc_stat nfs_rpcstat;

@@ -458,14 +465,13 @@ extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);

/* super.c */
-int nfs_clone_super(struct super_block *, struct nfs_mount_info *);
void nfs_umount_begin(struct super_block *);
int nfs_statfs(struct dentry *, struct kstatfs *);
int nfs_show_options(struct seq_file *, struct dentry *);
int nfs_show_devname(struct seq_file *, struct dentry *);
int nfs_show_path(struct seq_file *, struct dentry *);
int nfs_show_stats(struct seq_file *, struct dentry *);
-int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
+int nfs_remount(struct super_block *sb, struct mount_context *mc);

/* write.c */
extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
@@ -765,3 +771,16 @@ static inline bool nfs_error_is_fatal(int err)
return false;
}
}
+
+/*
+ * Select between a default port value and a user-specified port value.
+ * If a zero value is set, then autobind will be used.
+ */
+static inline void nfs_set_port(struct sockaddr *sap, int *port,
+ const unsigned short default_port)
+{
+ if (*port == NFS_UNSPEC_PORT)
+ *port = default_port;
+
+ rpc_set_port(sap, *port);
+}
diff --git a/fs/nfs/mount.c b/fs/nfs/mount.c
new file mode 100644
index 000000000000..4716bb0d0fd2
--- /dev/null
+++ b/fs/nfs/mount.c
@@ -0,0 +1,1539 @@
+/* NFS mount handling.
+ *
+ * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@xxxxxxxxxx)
+ *
+ * Split from fs/nfs/super.c:
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/parser.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs4_mount.h>
+#include "nfs.h"
+#include "internal.h"
+
+#define NFSDBG_FACILITY NFSDBG_VFS
+
+#if IS_ENABLED(CONFIG_NFS_V3)
+#define NFS_DEFAULT_VERSION 3
+#else
+#define NFS_DEFAULT_VERSION 2
+#endif
+
+enum {
+ /* Mount options that take no arguments */
+ Opt_soft, Opt_hard,
+ Opt_posix, Opt_noposix,
+ Opt_cto, Opt_nocto,
+ Opt_ac, Opt_noac,
+ Opt_lock, Opt_nolock,
+ Opt_udp, Opt_tcp, Opt_rdma,
+ Opt_acl, Opt_noacl,
+ Opt_rdirplus, Opt_nordirplus,
+ Opt_sharecache, Opt_nosharecache,
+ Opt_resvport, Opt_noresvport,
+ Opt_fscache, Opt_nofscache,
+ Opt_migration, Opt_nomigration,
+
+ /* Mount options that take integer arguments */
+ Opt_port,
+ Opt_rsize, Opt_wsize, Opt_bsize,
+ Opt_timeo, Opt_retrans,
+ Opt_acregmin, Opt_acregmax,
+ Opt_acdirmin, Opt_acdirmax,
+ Opt_actimeo,
+ Opt_namelen,
+ Opt_mountport,
+ Opt_mountvers,
+ Opt_minorversion,
+
+ /* Mount options that take string arguments */
+ Opt_nfsvers,
+ Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
+ Opt_addr, Opt_mountaddr, Opt_clientaddr,
+ Opt_lookupcache,
+ Opt_fscache_uniq,
+ Opt_local_lock,
+
+ /* Special mount options */
+ Opt_userspace, Opt_deprecated, Opt_sloppy,
+
+ Opt_err
+};
+
+static const match_table_t nfs_mount_option_tokens = {
+ { Opt_userspace, "bg" },
+ { Opt_userspace, "fg" },
+ { Opt_userspace, "retry=%s" },
+
+ { Opt_sloppy, "sloppy" },
+
+ { Opt_soft, "soft" },
+ { Opt_hard, "hard" },
+ { Opt_deprecated, "intr" },
+ { Opt_deprecated, "nointr" },
+ { Opt_posix, "posix" },
+ { Opt_noposix, "noposix" },
+ { Opt_cto, "cto" },
+ { Opt_nocto, "nocto" },
+ { Opt_ac, "ac" },
+ { Opt_noac, "noac" },
+ { Opt_lock, "lock" },
+ { Opt_nolock, "nolock" },
+ { Opt_udp, "udp" },
+ { Opt_tcp, "tcp" },
+ { Opt_rdma, "rdma" },
+ { Opt_acl, "acl" },
+ { Opt_noacl, "noacl" },
+ { Opt_rdirplus, "rdirplus" },
+ { Opt_nordirplus, "nordirplus" },
+ { Opt_sharecache, "sharecache" },
+ { Opt_nosharecache, "nosharecache" },
+ { Opt_resvport, "resvport" },
+ { Opt_noresvport, "noresvport" },
+ { Opt_fscache, "fsc" },
+ { Opt_nofscache, "nofsc" },
+ { Opt_migration, "migration" },
+ { Opt_nomigration, "nomigration" },
+
+ { Opt_port, "port=%s" },
+ { Opt_rsize, "rsize=%s" },
+ { Opt_wsize, "wsize=%s" },
+ { Opt_bsize, "bsize=%s" },
+ { Opt_timeo, "timeo=%s" },
+ { Opt_retrans, "retrans=%s" },
+ { Opt_acregmin, "acregmin=%s" },
+ { Opt_acregmax, "acregmax=%s" },
+ { Opt_acdirmin, "acdirmin=%s" },
+ { Opt_acdirmax, "acdirmax=%s" },
+ { Opt_actimeo, "actimeo=%s" },
+ { Opt_namelen, "namlen=%s" },
+ { Opt_mountport, "mountport=%s" },
+ { Opt_mountvers, "mountvers=%s" },
+ { Opt_minorversion, "minorversion=%s" },
+
+ { Opt_nfsvers, "nfsvers=%s" },
+ { Opt_nfsvers, "vers=%s" },
+
+ { Opt_sec, "sec=%s" },
+ { Opt_proto, "proto=%s" },
+ { Opt_mountproto, "mountproto=%s" },
+ { Opt_addr, "addr=%s" },
+ { Opt_clientaddr, "clientaddr=%s" },
+ { Opt_mounthost, "mounthost=%s" },
+ { Opt_mountaddr, "mountaddr=%s" },
+
+ { Opt_lookupcache, "lookupcache=%s" },
+ { Opt_fscache_uniq, "fsc=%s" },
+ { Opt_local_lock, "local_lock=%s" },
+
+ /* The following needs to be listed after all other options */
+ { Opt_nfsvers, "v%s" },
+
+ { Opt_err, NULL }
+};
+
+enum {
+ Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
+ Opt_xprt_rdma6,
+
+ Opt_xprt_err
+};
+
+static const match_table_t nfs_xprt_protocol_tokens = {
+ { Opt_xprt_udp, "udp" },
+ { Opt_xprt_udp6, "udp6" },
+ { Opt_xprt_tcp, "tcp" },
+ { Opt_xprt_tcp6, "tcp6" },
+ { Opt_xprt_rdma, "rdma" },
+ { Opt_xprt_rdma6, "rdma6" },
+
+ { Opt_xprt_err, NULL }
+};
+
+enum {
+ Opt_sec_none, Opt_sec_sys,
+ Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
+ Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
+ Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
+
+ Opt_sec_err
+};
+
+static const match_table_t nfs_secflavor_tokens = {
+ { Opt_sec_none, "none" },
+ { Opt_sec_none, "null" },
+ { Opt_sec_sys, "sys" },
+
+ { Opt_sec_krb5, "krb5" },
+ { Opt_sec_krb5i, "krb5i" },
+ { Opt_sec_krb5p, "krb5p" },
+
+ { Opt_sec_lkey, "lkey" },
+ { Opt_sec_lkeyi, "lkeyi" },
+ { Opt_sec_lkeyp, "lkeyp" },
+
+ { Opt_sec_spkm, "spkm3" },
+ { Opt_sec_spkmi, "spkm3i" },
+ { Opt_sec_spkmp, "spkm3p" },
+
+ { Opt_sec_err, NULL }
+};
+
+enum {
+ Opt_lookupcache_all, Opt_lookupcache_positive,
+ Opt_lookupcache_none,
+
+ Opt_lookupcache_err
+};
+
+static const match_table_t nfs_lookupcache_tokens = {
+ { Opt_lookupcache_all, "all" },
+ { Opt_lookupcache_positive, "pos" },
+ { Opt_lookupcache_positive, "positive" },
+ { Opt_lookupcache_none, "none" },
+
+ { Opt_lookupcache_err, NULL }
+};
+
+enum {
+ Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
+ Opt_local_lock_none,
+
+ Opt_local_lock_err
+};
+
+static const match_table_t nfs_local_lock_tokens = {
+ { Opt_local_lock_all, "all" },
+ { Opt_local_lock_flock, "flock" },
+ { Opt_local_lock_posix, "posix" },
+ { Opt_local_lock_none, "none" },
+
+ { Opt_local_lock_err, NULL }
+};
+
+enum {
+ Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
+ Opt_vers_4_1, Opt_vers_4_2,
+
+ Opt_vers_err
+};
+
+static const match_table_t nfs_vers_tokens = {
+ { Opt_vers_2, "2" },
+ { Opt_vers_3, "3" },
+ { Opt_vers_4, "4" },
+ { Opt_vers_4_0, "4.0" },
+ { Opt_vers_4_1, "4.1" },
+ { Opt_vers_4_2, "4.2" },
+
+ { Opt_vers_err, NULL }
+};
+
+const char nfs_slash[] = "/";
+EXPORT_SYMBOL_GPL(nfs_slash);
+
+/*
+ * Sanity-check a server address provided by the mount command.
+ *
+ * Address family must be initialized, and address must not be
+ * the ANY address for that family.
+ */
+static int nfs_verify_server_address(struct sockaddr *addr)
+{
+ switch (addr->sa_family) {
+ case AF_INET: {
+ struct sockaddr_in *sa = (struct sockaddr_in *)addr;
+ return sa->sin_addr.s_addr != htonl(INADDR_ANY);
+ }
+ case AF_INET6: {
+ struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
+ return !ipv6_addr_any(sa);
+ }
+ }
+
+ dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
+ return 0;
+}
+
+/*
+ * Sanity check the NFS transport protocol.
+ *
+ */
+static void nfs_validate_transport_protocol(struct nfs_mount_context *mnt)
+{
+ switch (mnt->nfs_server.protocol) {
+ case XPRT_TRANSPORT_UDP:
+ case XPRT_TRANSPORT_TCP:
+ case XPRT_TRANSPORT_RDMA:
+ break;
+ default:
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+ }
+}
+
+/*
+ * For text based NFSv2/v3 mounts, the mount protocol transport default
+ * settings should depend upon the specified NFS transport.
+ */
+static void nfs_set_mount_transport_protocol(struct nfs_mount_context *mnt)
+{
+ nfs_validate_transport_protocol(mnt);
+
+ if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
+ mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
+ return;
+ switch (mnt->nfs_server.protocol) {
+ case XPRT_TRANSPORT_UDP:
+ mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
+ break;
+ case XPRT_TRANSPORT_TCP:
+ case XPRT_TRANSPORT_RDMA:
+ mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
+ }
+}
+
+/*
+ * Add 'flavor' to 'auth_info' if not already present.
+ * Returns true if 'flavor' ends up in the list, false otherwise
+ */
+static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
+ rpc_authflavor_t flavor)
+{
+ unsigned int i;
+ unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
+
+ /* make sure this flavor isn't already in the list */
+ for (i = 0; i < auth_info->flavor_len; i++) {
+ if (flavor == auth_info->flavors[i])
+ return true;
+ }
+
+ if (auth_info->flavor_len + 1 >= max_flavor_len) {
+ dfprintk(MOUNT, "NFS: too many sec= flavors\n");
+ return false;
+ }
+
+ auth_info->flavors[auth_info->flavor_len++] = flavor;
+ return true;
+}
+
+/*
+ * Parse the value of the 'sec=' option.
+ */
+static int nfs_parse_security_flavors(char *value,
+ struct nfs_mount_context *mnt)
+{
+ substring_t args[MAX_OPT_ARGS];
+ rpc_authflavor_t pseudoflavor;
+ char *p;
+
+ dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
+
+ while ((p = strsep(&value, ":")) != NULL) {
+ switch (match_token(p, nfs_secflavor_tokens, args)) {
+ case Opt_sec_none:
+ pseudoflavor = RPC_AUTH_NULL;
+ break;
+ case Opt_sec_sys:
+ pseudoflavor = RPC_AUTH_UNIX;
+ break;
+ case Opt_sec_krb5:
+ pseudoflavor = RPC_AUTH_GSS_KRB5;
+ break;
+ case Opt_sec_krb5i:
+ pseudoflavor = RPC_AUTH_GSS_KRB5I;
+ break;
+ case Opt_sec_krb5p:
+ pseudoflavor = RPC_AUTH_GSS_KRB5P;
+ break;
+ case Opt_sec_lkey:
+ pseudoflavor = RPC_AUTH_GSS_LKEY;
+ break;
+ case Opt_sec_lkeyi:
+ pseudoflavor = RPC_AUTH_GSS_LKEYI;
+ break;
+ case Opt_sec_lkeyp:
+ pseudoflavor = RPC_AUTH_GSS_LKEYP;
+ break;
+ case Opt_sec_spkm:
+ pseudoflavor = RPC_AUTH_GSS_SPKM;
+ break;
+ case Opt_sec_spkmi:
+ pseudoflavor = RPC_AUTH_GSS_SPKMI;
+ break;
+ case Opt_sec_spkmp:
+ pseudoflavor = RPC_AUTH_GSS_SPKMP;
+ break;
+ default:
+ dfprintk(MOUNT,
+ "NFS: sec= option '%s' not recognized\n", p);
+ return 0;
+ }
+
+ if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
+ return 0;
+ }
+
+ return 1;
+}
+
+static int nfs_parse_version_string(char *string,
+ struct nfs_mount_context *mnt,
+ substring_t *args)
+{
+ mnt->flags &= ~NFS_MOUNT_VER3;
+ switch (match_token(string, nfs_vers_tokens, args)) {
+ case Opt_vers_2:
+ mnt->version = 2;
+ break;
+ case Opt_vers_3:
+ mnt->flags |= NFS_MOUNT_VER3;
+ mnt->version = 3;
+ break;
+ case Opt_vers_4:
+ /* Backward compatibility option. In future,
+ * the mount program should always supply
+ * a NFSv4 minor version number.
+ */
+ mnt->version = 4;
+ break;
+ case Opt_vers_4_0:
+ mnt->version = 4;
+ mnt->minorversion = 0;
+ break;
+ case Opt_vers_4_1:
+ mnt->version = 4;
+ mnt->minorversion = 1;
+ break;
+ case Opt_vers_4_2:
+ mnt->version = 4;
+ mnt->minorversion = 2;
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+static int nfs_get_option_str(substring_t args[], char **option)
+{
+ kfree(*option);
+ *option = match_strdup(args);
+ return !*option;
+}
+
+static int nfs_get_option_ui(struct nfs_mount_context *mc,
+ substring_t args[], unsigned int *option)
+{
+ match_strlcpy(mc->buf, args, sizeof(mc->buf));
+ return kstrtouint(mc->buf, 10, option);
+}
+
+static int nfs_get_option_ui_bound(struct nfs_mount_context *mc,
+ substring_t args[], unsigned int *option,
+ unsigned int l_bound, unsigned u_bound)
+{
+ int ret;
+
+ match_strlcpy(mc->buf, args, sizeof(mc->buf));
+ ret = kstrtouint(mc->buf, 10, option);
+ if (ret < 0)
+ return ret;
+ if (*option < l_bound || *option > u_bound)
+ return -ERANGE;
+ return 0;
+}
+
+/*
+ * Split mc->device into "hostname:export_path".
+ *
+ * The leftmost colon demarks the split between the server's hostname
+ * and the export path. If the hostname starts with a left square
+ * bracket, then it may contain colons.
+ *
+ * Note: caller frees hostname and export path, even on error.
+ */
+static int nfs_parse_devname(struct nfs_mount_context *ctx,
+ size_t maxnamlen, size_t maxpathlen)
+{
+ char *dev_name = ctx->mc.device;
+ size_t len;
+ char *end;
+
+ /* Is the host name protected with square brakcets? */
+ if (*dev_name == '[') {
+ end = strchr(++dev_name, ']');
+ if (end == NULL || end[1] != ':')
+ goto out_bad_devname;
+
+ len = end - dev_name;
+ end++;
+ } else {
+ char *comma;
+
+ end = strchr(dev_name, ':');
+ if (end == NULL)
+ goto out_bad_devname;
+ len = end - dev_name;
+
+ /* kill possible hostname list: not supported */
+ comma = strchr(dev_name, ',');
+ if (comma != NULL && comma < end)
+ *comma = 0;
+ }
+
+ if (len > maxnamlen)
+ goto out_hostname;
+
+ /* N.B. caller will free nfs_server.hostname in all cases */
+ ctx->nfs_server.hostname = kstrcreate(dev_name, len, GFP_KERNEL);
+ if (!ctx->nfs_server.hostname)
+ goto out_nomem;
+ len = strlen(++end);
+ if (len > maxpathlen)
+ goto out_path;
+ ctx->nfs_server.export_path = kstrcreate(end, len, GFP_KERNEL);
+ if (!ctx->nfs_server.export_path)
+ goto out_nomem;
+
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
+ return 0;
+
+out_bad_devname:
+ ctx->mc.error = "NFS: device name not in host:path format";
+ return -EINVAL;
+out_nomem:
+ ctx->mc.error = "NFS: not enough memory to parse device name";
+ return -ENOMEM;
+out_hostname:
+ ctx->mc.error = "NFS: server hostname too long";
+ return -ENAMETOOLONG;
+out_path:
+ ctx->mc.error = "NFS: export pathname too long";
+ return -ENAMETOOLONG;
+}
+
+/*
+ * Parse monolithic NFS2/NFS3 mount data
+ * - fills in the mount root filehandle
+ *
+ * For option strings, user space handles the following behaviors:
+ *
+ * + DNS: mapping server host name to IP address ("addr=" option)
+ *
+ * + failure mode: how to behave if a mount request can't be handled
+ * immediately ("fg/bg" option)
+ *
+ * + retry: how often to retry a mount request ("retry=" option)
+ *
+ * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
+ * mountproto=tcp after mountproto=udp, and so on
+ */
+static int nfs23_monolithic_mount_data(struct mount_context *mc,
+ struct nfs_mount_data *data)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+ struct nfs_fh *mntfh = ctx->mntfh;
+ struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
+ int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
+ int ret;
+
+ if (data == NULL)
+ goto out_no_data;
+
+ ctx->version = NFS_DEFAULT_VERSION;
+ switch (data->version) {
+ case 1:
+ data->namlen = 0;
+ case 2:
+ data->bsize = 0;
+ case 3:
+ if (data->flags & NFS_MOUNT_VER3)
+ goto out_no_v3;
+ data->root.size = NFS2_FHSIZE;
+ memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
+ /* Turn off security negotiation */
+ extra_flags |= NFS_MOUNT_SECFLAVOUR;
+ case 4:
+ if (data->flags & NFS_MOUNT_SECFLAVOUR)
+ goto out_no_sec;
+ case 5:
+ memset(data->context, 0, sizeof(data->context));
+ case 6:
+ if (data->flags & NFS_MOUNT_VER3) {
+ if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
+ goto out_invalid_fh;
+ mntfh->size = data->root.size;
+ ctx->version = 3;
+ } else {
+ mntfh->size = NFS2_FHSIZE;
+ ctx->version = 2;
+ }
+
+ memcpy(mntfh->data, data->root.data, mntfh->size);
+ if (mntfh->size < sizeof(mntfh->data))
+ memset(mntfh->data + mntfh->size, 0,
+ sizeof(mntfh->data) - mntfh->size);
+
+ /*
+ * Translate to nfs_mount_context, which nfs_fill_super
+ * can deal with.
+ */
+ ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
+ ctx->flags |= extra_flags;
+ ctx->rsize = data->rsize;
+ ctx->wsize = data->wsize;
+ ctx->timeo = data->timeo;
+ ctx->retrans = data->retrans;
+ ctx->acregmin = data->acregmin;
+ ctx->acregmax = data->acregmax;
+ ctx->acdirmin = data->acdirmin;
+ ctx->acdirmax = data->acdirmax;
+ ctx->need_mount = false;
+
+ memcpy(sap, &data->addr, sizeof(data->addr));
+ ctx->nfs_server.addrlen = sizeof(data->addr);
+ ctx->nfs_server.port = ntohs(data->addr.sin_port);
+ if (!nfs_verify_server_address(sap))
+ goto out_no_address;
+
+ if (!(data->flags & NFS_MOUNT_TCP))
+ ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+ /* N.B. caller will free nfs_server.hostname in all cases */
+ ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
+ if (!ctx->nfs_server.hostname)
+ goto out_nomem;
+
+ ctx->namlen = data->namlen;
+ ctx->bsize = data->bsize;
+
+ if (data->flags & NFS_MOUNT_SECFLAVOUR)
+ ctx->selected_flavor = data->pseudoflavor;
+ else
+ ctx->selected_flavor = RPC_AUTH_UNIX;
+
+ if (!(data->flags & NFS_MOUNT_NONLM))
+ ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+ else
+ ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+
+ /* The legacy version 6 binary mount data from userspace has a
+ * field used only to transport selinux information into the
+ * the kernel. To continue to support that functionality we
+ * have a touch of selinux knowledge here in the NFS code. The
+ * userspace code converted context=blah to just blah so we are
+ * converting back to the full string selinux understands.
+ */
+ if (data->context[0]){
+#ifdef CONFIG_SECURITY_SELINUX
+ char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
+ if (!opts_str)
+ return -ENOMEM;
+ strcpy(opts_str, "context=");
+ data->context[NFS_MAX_CONTEXT_LEN] = '\0';
+ strcat(opts_str, &data->context[0]);
+ ret = vfs_mount_option(mc, opts_str);
+ kfree(opts_str);
+ if (ret)
+ return ret;
+#else
+ return -EINVAL;
+#endif
+ }
+
+ break;
+ default:
+ return generic_monolithic_mount_data(mc, data);
+ }
+
+ ctx->skip_remount_option_check = true;
+ return 0;
+
+out_no_data:
+ if (mc->ms_flags & MS_REMOUNT) {
+ ctx->skip_remount_option_check = true;
+ return 0;
+ }
+ mc->error = "NFS: mount program didn't pass any mount data";
+ return -EINVAL;
+
+out_no_v3:
+ mc->error = "NFS: nfs_mount_data version does not support v3";
+ return -EINVAL;
+
+out_no_sec:
+ mc->error = "NFS: nfs_mount_data version supports only AUTH_SYS";
+ return -EINVAL;
+
+out_nomem:
+ dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
+ return -ENOMEM;
+
+out_no_address:
+ mc->error = "NFS: mount program didn't pass remote address";
+ return -EINVAL;
+
+out_invalid_fh:
+ mc->error = "NFS: invalid root filehandle";
+ return -EINVAL;
+}
+
+/*
+ * Validate NFSv4 mount options
+ */
+static int nfs4_monolithic_mount_data(struct mount_context *mc,
+ struct nfs4_mount_data *data)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+ struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
+ char *c;
+
+ if (data == NULL)
+ goto out_no_data;
+
+ ctx->version = 4;
+
+ switch (data->version) {
+ case 1:
+ if (data->host_addrlen > sizeof(ctx->nfs_server.address))
+ goto out_no_address;
+ if (data->host_addrlen == 0)
+ goto out_no_address;
+ ctx->nfs_server.addrlen = data->host_addrlen;
+ if (copy_from_user(sap, data->host_addr, data->host_addrlen))
+ return -EFAULT;
+ if (!nfs_verify_server_address(sap))
+ goto out_no_address;
+ ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
+
+ if (data->auth_flavourlen) {
+ rpc_authflavor_t pseudoflavor;
+ if (data->auth_flavourlen > 1)
+ goto out_inval_auth;
+ if (copy_from_user(&pseudoflavor,
+ data->auth_flavours,
+ sizeof(pseudoflavor)))
+ return -EFAULT;
+ ctx->selected_flavor = pseudoflavor;
+ } else
+ ctx->selected_flavor = RPC_AUTH_UNIX;
+
+ c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ ctx->nfs_server.hostname = c;
+
+ c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ ctx->nfs_server.export_path = c;
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
+
+ c = strndup_user(data->client_addr.data, 16);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ ctx->client_address = c;
+
+ /*
+ * Translate to nfs_mount_context, which nfs4_fill_super
+ * can deal with.
+ */
+
+ ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
+ ctx->rsize = data->rsize;
+ ctx->wsize = data->wsize;
+ ctx->timeo = data->timeo;
+ ctx->retrans = data->retrans;
+ ctx->acregmin = data->acregmin;
+ ctx->acregmax = data->acregmax;
+ ctx->acdirmin = data->acdirmin;
+ ctx->acdirmax = data->acdirmax;
+ ctx->nfs_server.protocol = data->proto;
+ nfs_validate_transport_protocol(ctx);
+ if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
+ goto out_invalid_transport_udp;
+
+ break;
+ default:
+ return generic_monolithic_mount_data(mc, data);
+ }
+
+ ctx->skip_remount_option_check = true;
+ return 0;
+
+out_no_data:
+ if (mc->ms_flags & MS_REMOUNT) {
+ ctx->skip_remount_option_check = true;
+ return 0;
+ }
+ mc->error = "NFS4: mount program didn't pass any mount data";
+ return -EINVAL;
+
+out_inval_auth:
+ mc->error = "NFS4: Invalid number of RPC auth flavours";
+ return -EINVAL;
+
+out_no_address:
+ mc->error = "NFS4: mount program didn't pass remote address";
+ return -EINVAL;
+
+out_invalid_transport_udp:
+ mc->error = "NFSv4: Unsupported transport protocol udp";
+ return -EINVAL;
+}
+
+/*
+ * Parse a monolithic block of data from sys_mount().
+ */
+static int nfs_monolithic_mount_data(struct mount_context *mc, void *data)
+{
+ if (mc->fs_type == &nfs_fs_type)
+ return nfs23_monolithic_mount_data(mc, data);
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+ if (mc->fs_type == &nfs4_fs_type)
+ return nfs4_monolithic_mount_data(mc, data);
+#endif
+
+ mc->error = "NFS: Unsupported monolithic data version";
+ return -EINVAL;
+}
+
+/*
+ * Parse a single mount option in "key[=val]" form.
+ */
+static int nfs_mount_ctx_option(struct mount_context *mc, char *p)
+{
+ struct nfs_mount_context *mnt =
+ container_of(mc, struct nfs_mount_context, mc);
+ substring_t args[MAX_OPT_ARGS];
+ char *string;
+ int rc = 0, token;
+
+ dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
+
+ token = match_token(p, nfs_mount_option_tokens, args);
+ switch (token) {
+ /*
+ * boolean options: foo/nofoo
+ */
+ case Opt_soft:
+ mnt->flags |= NFS_MOUNT_SOFT;
+ break;
+ case Opt_hard:
+ mnt->flags &= ~NFS_MOUNT_SOFT;
+ break;
+ case Opt_posix:
+ mnt->flags |= NFS_MOUNT_POSIX;
+ break;
+ case Opt_noposix:
+ mnt->flags &= ~NFS_MOUNT_POSIX;
+ break;
+ case Opt_cto:
+ mnt->flags &= ~NFS_MOUNT_NOCTO;
+ break;
+ case Opt_nocto:
+ mnt->flags |= NFS_MOUNT_NOCTO;
+ break;
+ case Opt_ac:
+ mnt->flags &= ~NFS_MOUNT_NOAC;
+ break;
+ case Opt_noac:
+ mnt->flags |= NFS_MOUNT_NOAC;
+ break;
+ case Opt_lock:
+ mnt->flags &= ~NFS_MOUNT_NONLM;
+ mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
+ break;
+ case Opt_nolock:
+ mnt->flags |= NFS_MOUNT_NONLM;
+ mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
+ break;
+ case Opt_udp:
+ mnt->flags &= ~NFS_MOUNT_TCP;
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+ break;
+ case Opt_tcp:
+ mnt->flags |= NFS_MOUNT_TCP;
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+ break;
+ case Opt_rdma:
+ mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+ xprt_load_transport(p);
+ break;
+ case Opt_acl:
+ mnt->flags &= ~NFS_MOUNT_NOACL;
+ break;
+ case Opt_noacl:
+ mnt->flags |= NFS_MOUNT_NOACL;
+ break;
+ case Opt_rdirplus:
+ mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
+ break;
+ case Opt_nordirplus:
+ mnt->flags |= NFS_MOUNT_NORDIRPLUS;
+ break;
+ case Opt_sharecache:
+ mnt->flags &= ~NFS_MOUNT_UNSHARED;
+ break;
+ case Opt_nosharecache:
+ mnt->flags |= NFS_MOUNT_UNSHARED;
+ break;
+ case Opt_resvport:
+ mnt->flags &= ~NFS_MOUNT_NORESVPORT;
+ break;
+ case Opt_noresvport:
+ mnt->flags |= NFS_MOUNT_NORESVPORT;
+ break;
+ case Opt_fscache:
+ mnt->options |= NFS_OPTION_FSCACHE;
+ kfree(mnt->fscache_uniq);
+ mnt->fscache_uniq = NULL;
+ break;
+ case Opt_nofscache:
+ mnt->options &= ~NFS_OPTION_FSCACHE;
+ kfree(mnt->fscache_uniq);
+ mnt->fscache_uniq = NULL;
+ break;
+ case Opt_migration:
+ mnt->options |= NFS_OPTION_MIGRATION;
+ break;
+ case Opt_nomigration:
+ mnt->options &= NFS_OPTION_MIGRATION;
+ break;
+
+ /*
+ * options that take numeric values
+ */
+ case Opt_port:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->nfs_server.port,
+ 0, USHRT_MAX))
+ goto out_invalid_value;
+ break;
+ case Opt_rsize:
+ if (nfs_get_option_ui(mnt, args, &mnt->rsize))
+ goto out_invalid_value;
+ break;
+ case Opt_wsize:
+ if (nfs_get_option_ui(mnt, args, &mnt->wsize))
+ goto out_invalid_value;
+ break;
+ case Opt_bsize:
+ if (nfs_get_option_ui(mnt, args, &mnt->bsize))
+ goto out_invalid_value;
+ break;
+ case Opt_timeo:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->timeo, 1, INT_MAX))
+ goto out_invalid_value;
+ break;
+ case Opt_retrans:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->retrans, 0, INT_MAX))
+ goto out_invalid_value;
+ break;
+ case Opt_acregmin:
+ if (nfs_get_option_ui(mnt, args, &mnt->acregmin))
+ goto out_invalid_value;
+ break;
+ case Opt_acregmax:
+ if (nfs_get_option_ui(mnt, args, &mnt->acregmax))
+ goto out_invalid_value;
+ break;
+ case Opt_acdirmin:
+ if (nfs_get_option_ui(mnt, args, &mnt->acdirmin))
+ goto out_invalid_value;
+ break;
+ case Opt_acdirmax:
+ if (nfs_get_option_ui(mnt, args, &mnt->acdirmax))
+ goto out_invalid_value;
+ break;
+ case Opt_actimeo:
+ if (nfs_get_option_ui(mnt, args, &mnt->acdirmax))
+ goto out_invalid_value;
+ mnt->acregmin = mnt->acregmax =
+ mnt->acdirmin = mnt->acdirmax;
+ break;
+ case Opt_namelen:
+ if (nfs_get_option_ui(mnt, args, &mnt->namlen))
+ goto out_invalid_value;
+ break;
+ case Opt_mountport:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->mount_server.port,
+ 0, USHRT_MAX))
+ goto out_invalid_value;
+ break;
+ case Opt_mountvers:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->mount_server.version,
+ NFS_MNT_VERSION, NFS_MNT3_VERSION))
+ goto out_invalid_value;
+ break;
+ case Opt_minorversion:
+ if (nfs_get_option_ui_bound(mnt, args, &mnt->minorversion,
+ 0, NFS4_MAX_MINOR_VERSION))
+ goto out_invalid_value;
+ break;
+
+ /*
+ * options that take text values
+ */
+ case Opt_nfsvers:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ rc = nfs_parse_version_string(string, mnt, args);
+ kfree(string);
+ if (!rc)
+ goto out_invalid_value;
+ break;
+ case Opt_sec:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ rc = nfs_parse_security_flavors(string, mnt);
+ kfree(string);
+ if (!rc) {
+ dfprintk(MOUNT, "NFS: unrecognized security flavor\n");
+ return -EINVAL;
+ }
+ break;
+ case Opt_proto:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ token = match_token(string, nfs_xprt_protocol_tokens, args);
+
+ mnt->protofamily = AF_INET;
+ switch (token) {
+ case Opt_xprt_udp6:
+ mnt->protofamily = AF_INET6;
+ case Opt_xprt_udp:
+ mnt->flags &= ~NFS_MOUNT_TCP;
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+ break;
+ case Opt_xprt_tcp6:
+ mnt->protofamily = AF_INET6;
+ case Opt_xprt_tcp:
+ mnt->flags |= NFS_MOUNT_TCP;
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+ break;
+ case Opt_xprt_rdma6:
+ mnt->protofamily = AF_INET6;
+ case Opt_xprt_rdma:
+ /* vector side protocols to TCP */
+ mnt->flags |= NFS_MOUNT_TCP;
+ mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+ xprt_load_transport(string);
+ break;
+ default:
+ dfprintk(MOUNT, "NFS: unrecognized transport protocol\n");
+ kfree(string);
+ return -EINVAL;
+ }
+ kfree(string);
+ break;
+ case Opt_mountproto:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ token = match_token(string, nfs_xprt_protocol_tokens, args);
+ kfree(string);
+
+ mnt->mountfamily = AF_INET;
+ switch (token) {
+ case Opt_xprt_udp6:
+ mnt->mountfamily = AF_INET6;
+ case Opt_xprt_udp:
+ mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
+ break;
+ case Opt_xprt_tcp6:
+ mnt->mountfamily = AF_INET6;
+ case Opt_xprt_tcp:
+ mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
+ break;
+ case Opt_xprt_rdma: /* not used for side protocols */
+ default:
+ mc->error = "NFS: Unrecognized transport protocol";
+ return -EINVAL;
+ }
+ break;
+ case Opt_addr:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ mnt->nfs_server.addrlen =
+ rpc_pton(mc->net_ns, string, strlen(string),
+ (struct sockaddr *)&mnt->nfs_server.address,
+ sizeof(mnt->nfs_server._address));
+ kfree(string);
+ if (mnt->nfs_server.addrlen == 0)
+ goto out_invalid_address;
+ break;
+ case Opt_clientaddr:
+ if (nfs_get_option_str(args, &mnt->client_address))
+ goto out_nomem;
+ break;
+ case Opt_mounthost:
+ if (nfs_get_option_str(args, &mnt->mount_server.hostname))
+ goto out_nomem;
+ break;
+ case Opt_mountaddr:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ mnt->mount_server.addrlen =
+ rpc_pton(mc->net_ns, string, strlen(string),
+ (struct sockaddr *)&mnt->mount_server.address,
+ sizeof(mnt->mount_server._address));
+ kfree(string);
+ if (mnt->mount_server.addrlen == 0)
+ goto out_invalid_address;
+ break;
+ case Opt_lookupcache:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ token = match_token(string, nfs_lookupcache_tokens, args);
+ kfree(string);
+ switch (token) {
+ case Opt_lookupcache_all:
+ mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
+ break;
+ case Opt_lookupcache_positive:
+ mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
+ mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
+ break;
+ case Opt_lookupcache_none:
+ mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
+ break;
+ default:
+ mc->error = "NFS: Invalid lookupcache argument";
+ return -EINVAL;
+ }
+ break;
+ case Opt_fscache_uniq:
+ if (nfs_get_option_str(args, &mnt->fscache_uniq))
+ goto out_nomem;
+ mnt->options |= NFS_OPTION_FSCACHE;
+ break;
+ case Opt_local_lock:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ token = match_token(string, nfs_local_lock_tokens, args);
+ kfree(string);
+ switch (token) {
+ case Opt_local_lock_all:
+ mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+ break;
+ case Opt_local_lock_flock:
+ mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
+ break;
+ case Opt_local_lock_posix:
+ mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
+ break;
+ case Opt_local_lock_none:
+ mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+ break;
+ default:
+ mc->error = "NFS: invalid local_lock argument";
+ return -EINVAL;
+ }
+ break;
+
+ /*
+ * Special options
+ */
+ case Opt_sloppy:
+ mc->sloppy = 1;
+ dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
+ break;
+ case Opt_userspace:
+ case Opt_deprecated:
+ dfprintk(MOUNT, "NFS: ignoring mount option '%s'\n", p);
+ break;
+
+ default:
+ dfprintk(MOUNT, "NFS: unrecognized mount option '%s'\n", p);
+ if (!mc->sloppy) {
+ mc->error = "NFS: Unrecognized mount option";
+ return -EINVAL;
+ }
+ break;
+ }
+
+ return 0;
+
+out_nomem:
+ printk(KERN_INFO "NFS: not enough memory to parse option\n");
+ return -ENOMEM;
+out_invalid_value:
+ mc->error = "NFS: Bad mount option value specified";
+ return -EINVAL;
+out_invalid_address:
+ mc->error = "NFS: Bad IP address specified";
+ return -EINVAL;
+}
+
+/*
+ * Validate the preparsed information in the mount context.
+ */
+static int nfs_mount_ctx_validate(struct mount_context *mc)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+ struct nfs_subversion *nfs_mod;
+ struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
+ int max_namelen = PAGE_SIZE;
+ int max_pathlen = NFS_MAXPATHLEN;
+ int port = 0;
+ int ret;
+
+ if (ctx->mc.mount_type & MOUNT_TYPE_REMOUNT)
+ return 0;
+
+ if (!ctx->mc.device)
+ goto out_no_device_name;
+
+ /* Check for sanity first. */
+ if (ctx->minorversion && ctx->version != 4)
+ goto out_minorversion_mismatch;
+
+ if (ctx->options & NFS_OPTION_MIGRATION &&
+ (ctx->version != 4 || ctx->minorversion != 0))
+ goto out_migration_misuse;
+
+ /* Verify that any proto=/mountproto= options match the address
+ * families in the addr=/mountaddr= options.
+ */
+ if (ctx->protofamily != AF_UNSPEC &&
+ ctx->protofamily != ctx->nfs_server.address.sa_family)
+ goto out_proto_mismatch;
+
+ if (ctx->mountfamily != AF_UNSPEC) {
+ if (ctx->mount_server.addrlen) {
+ if (ctx->mountfamily != ctx->mount_server.address.sa_family)
+ goto out_mountproto_mismatch;
+ } else {
+ if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
+ goto out_mountproto_mismatch;
+ }
+ }
+
+ if (!nfs_verify_server_address(sap))
+ goto out_no_address;
+
+ if (ctx->version == 4) {
+ if (IS_ENABLED(CONFIG_NFS_V4)) {
+ port = NFS_PORT;
+ max_namelen = NFS4_MAXNAMLEN;
+ max_pathlen = NFS4_MAXPATHLEN;
+ nfs_validate_transport_protocol(ctx);
+ if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
+ goto out_invalid_transport_udp;
+ ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
+ NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
+ NFS_MOUNT_LOCAL_FCNTL);
+ } else {
+ goto out_v4_not_compiled;
+ }
+ } else {
+ nfs_set_mount_transport_protocol(ctx);
+ }
+
+ nfs_set_port(sap, &ctx->nfs_server.port, port);
+
+ ret = nfs_parse_devname(ctx, max_namelen, max_pathlen);
+ if (ret < 0)
+ return ret;
+
+ /* Load the NFS protocol module if we haven't done so yet */
+ if (!ctx->nfs_mod) {
+ nfs_mod = get_nfs_version(ctx->version);
+ if (IS_ERR(nfs_mod)) {
+ ret = PTR_ERR(nfs_mod);
+ goto out_version_unavailable;
+ }
+ ctx->nfs_mod = nfs_mod;
+ }
+ return 0;
+
+out_no_device_name:
+ mc->error = "NFS: Device name not specified";
+ return -EINVAL;
+out_v4_not_compiled:
+ mc->error = "NFS: NFSv4 is not compiled into kernel";
+ return -EPROTONOSUPPORT;
+out_invalid_transport_udp:
+ mc->error = "NFSv4: Unsupported transport protocol udp";
+ return -EINVAL;
+out_no_address:
+ mc->error = "NFS: mount program didn't pass remote address";
+ return -EINVAL;
+out_mountproto_mismatch:
+ mc->error = "NFS: Mount server address does not match mountproto= option";
+ return -EINVAL;
+out_proto_mismatch:
+ mc->error = "NFS: Server address does not match proto= option";
+ return -EINVAL;
+out_minorversion_mismatch:
+ mc->error = "NFS: Mount option does not support minorversion";
+ return -EINVAL;
+out_migration_misuse:
+ mc->error = "NFS: 'Migration' not supported for this NFS version";
+ return -EINVAL;
+out_version_unavailable:
+ mc->error = "NFS: Version unavailable";
+ return ret;
+}
+
+/*
+ * Use the preparsed information in the mount context to effect a mount.
+ */
+static struct dentry *nfs_ordinary_mount(struct nfs_mount_context *ctx)
+{
+ ctx->set_security = nfs_set_sb_security;
+
+ return ctx->nfs_mod->rpc_ops->try_mount(ctx);
+}
+
+/*
+ * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
+ */
+static struct dentry *nfs_xdev_mount(struct nfs_mount_context *ctx)
+{
+ struct nfs_server *server;
+ struct dentry *mntroot = ERR_PTR(-ENOMEM);
+
+ dprintk("--> nfs_xdev_mount()\n");
+
+ ctx->set_security = nfs_clone_sb_security;
+
+ /* create a new volume representation */
+ server = ctx->nfs_mod->rpc_ops->clone_server(NFS_SB(ctx->clone_data.sb),
+ ctx->mntfh,
+ ctx->clone_data.fattr,
+ ctx->selected_flavor);
+
+ if (IS_ERR(server))
+ mntroot = ERR_CAST(server);
+ else
+ mntroot = nfs_fs_mount_common(server, ctx);
+
+ dprintk("<-- nfs_xdev_mount() = %ld\n",
+ IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
+ return mntroot;
+}
+
+/*
+ * Handle ordinary mounts inspired by the user and cross-FSID mounts.
+ */
+struct dentry *nfs_general_mount(struct nfs_mount_context *ctx)
+{
+ switch (ctx->mount_type) {
+ case NFS_MOUNT_ORDINARY:
+ return nfs_ordinary_mount(ctx);
+
+ case NFS_MOUNT_CROSS_DEV:
+ return nfs_xdev_mount(ctx);
+
+ default:
+ ctx->mc.error = "NFS: Unknown mount type";
+ return ERR_PTR(-ENOTSUPP);
+ }
+}
+EXPORT_SYMBOL_GPL(nfs_general_mount);
+
+static struct dentry *nfs_fs_mount(struct mount_context *mc)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+
+ if (!ctx->nfs_mod) {
+ pr_warn("Missing nfs_mod\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if (!ctx->nfs_mod->rpc_ops) {
+ pr_warn("Missing rpc_ops\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if (!ctx->nfs_mod->rpc_ops->mount) {
+ pr_warn("Missing mount\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ return ctx->nfs_mod->rpc_ops->mount(ctx);
+}
+
+/*
+ * Handle duplication of a mount context. The caller copied *src into *mc, but
+ * it can't deal with resource pointers in the filesystem context, so we have
+ * to do that. We need to clear pointers, copy data or get extra refs as
+ * appropriate.
+ */
+static int nfs_mount_ctx_dup(struct mount_context *mc, struct mount_context *src)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+
+ __module_get(ctx->nfs_mod->owner);
+ ctx->client_address = NULL;
+ ctx->mount_server.hostname = NULL;
+ ctx->nfs_server.export_path = NULL;
+ ctx->nfs_server.hostname = NULL;
+ ctx->fscache_uniq = NULL;
+
+ ctx->mntfh = nfs_alloc_fhandle();
+ if (!ctx->mntfh)
+ return -ENOMEM;
+ return 0;
+}
+
+static void nfs_mount_ctx_free(struct mount_context *mc)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+
+ if (ctx->nfs_mod)
+ put_nfs_version(ctx->nfs_mod);
+ kfree(ctx->client_address);
+ kfree(ctx->mount_server.hostname);
+ if (ctx->nfs_server.export_path != nfs_slash)
+ kfree(ctx->nfs_server.export_path);
+ kfree(ctx->nfs_server.hostname);
+ kfree(ctx->fscache_uniq);
+ nfs_free_fhandle(ctx->mntfh);
+}
+
+static const struct mount_context_operations nfs_mount_ctx_ops = {
+ .free = nfs_mount_ctx_free,
+ .dup = nfs_mount_ctx_dup,
+ .option = nfs_mount_ctx_option,
+ .monolithic_mount_data = nfs_monolithic_mount_data,
+ .validate = nfs_mount_ctx_validate,
+ .mount = nfs_fs_mount,
+ .fill_super = nfs_fill_super,
+};
+
+/*
+ * Initialise a mount context from an extant superblock for remounting.
+ */
+static int nfs_mount_init_from_sb(struct mount_context *mc,
+ struct super_block *sb)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+ struct nfs_server *nfss = sb->s_fs_info;
+ struct net *net = nfss->nfs_client->cl_net;
+
+ ctx->flags = nfss->flags;
+ ctx->rsize = nfss->rsize;
+ ctx->wsize = nfss->wsize;
+ ctx->retrans = nfss->client->cl_timeout->to_retries;
+ ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
+ ctx->acregmin = nfss->acregmin / HZ;
+ ctx->acregmax = nfss->acregmax / HZ;
+ ctx->acdirmin = nfss->acdirmin / HZ;
+ ctx->acdirmax = nfss->acdirmax / HZ;
+ ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
+ ctx->nfs_server.port = nfss->port;
+ ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
+ ctx->version = nfss->nfs_client->rpc_ops->version;
+ ctx->minorversion = nfss->nfs_client->cl_minorversion;
+
+ memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
+ ctx->nfs_server.addrlen);
+
+ if (ctx->mc.net_ns != net) {
+ put_net(ctx->mc.net_ns);
+ ctx->mc.net_ns = get_net(net);
+ }
+
+ ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
+ if (!try_module_get(ctx->nfs_mod->owner)) {
+ ctx->nfs_mod = NULL;
+ mc->error = "NFS: Protocol module not available";
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+/*
+ * Prepare mount context. We use the namespaces attached to the context. This
+ * may be the current process's namespaces, or it may be a container's
+ * namespaces.
+ */
+static int nfs_fs_fsopen(struct mount_context *mc, struct super_block *src_sb)
+{
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+
+ ctx->mntfh = nfs_alloc_fhandle();
+ if (!ctx->mntfh)
+ return -ENOMEM;
+
+ ctx->mc.ops = &nfs_mount_ctx_ops;
+ ctx->mount_type = NFS_MOUNT_ORDINARY;
+ ctx->protofamily = AF_UNSPEC;
+ ctx->mountfamily = AF_UNSPEC;
+ ctx->mount_server.port = NFS_UNSPEC_PORT;
+
+ if (!src_sb) {
+ ctx->timeo = NFS_UNSPEC_TIMEO;
+ ctx->retrans = NFS_UNSPEC_RETRANS;
+ ctx->acregmin = NFS_DEF_ACREGMIN;
+ ctx->acregmax = NFS_DEF_ACREGMAX;
+ ctx->acdirmin = NFS_DEF_ACDIRMIN;
+ ctx->acdirmax = NFS_DEF_ACDIRMAX;
+ ctx->nfs_server.port = NFS_UNSPEC_PORT;
+ ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+ ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
+ ctx->minorversion = 0;
+ ctx->need_mount = true;
+ return 0;
+ }
+
+ return nfs_mount_init_from_sb(mc, src_sb);
+}
+
+struct file_system_type nfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs",
+ .fsopen = nfs_fs_fsopen,
+ .mc_size = sizeof(struct nfs_mount_context),
+ .kill_sb = nfs_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+};
+MODULE_ALIAS_FS("nfs");
+EXPORT_SYMBOL_GPL(nfs_fs_type);
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+struct file_system_type nfs4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfs4",
+ .fsopen = nfs_fs_fsopen,
+ .mc_size = sizeof(struct nfs_mount_context),
+ .kill_sb = nfs_kill_super,
+ .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+};
+MODULE_ALIAS_FS("nfs4");
+MODULE_ALIAS("nfs4");
+EXPORT_SYMBOL_GPL(nfs4_fs_type);
+#endif /* CONFIG_NFS_V4 */
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 786f17580582..9be008f7072e 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -18,6 +18,7 @@
#include <linux/vfs.h>
#include <linux/sunrpc/gss_api.h>
#include "internal.h"
+#include "nfs.h"

#define NFSDBG_FACILITY NFSDBG_VFS

@@ -224,10 +225,9 @@ void nfs_release_automount_timer(void)
* Clone a mountpoint of the appropriate type
*/
static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
- const char *devname,
- struct nfs_clone_mount *mountdata)
+ struct nfs_mount_context *ctx)
{
- return vfs_submount(mountdata->dentry, &nfs_xdev_fs_type, devname, mountdata);
+ return vfs_submount_mc(ctx->clone_data.dentry, &ctx->mc);
}

/**
@@ -241,33 +241,56 @@ static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
struct nfs_fattr *fattr, rpc_authflavor_t authflavor)
{
- struct nfs_clone_mount mountdata = {
- .sb = dentry->d_sb,
- .dentry = dentry,
- .fh = fh,
- .fattr = fattr,
- .authflavor = authflavor,
- };
- struct vfsmount *mnt = ERR_PTR(-ENOMEM);
- char *page = (char *) __get_free_page(GFP_USER);
- char *devname;
+ struct nfs_mount_context *ctx;
+ struct mount_context *mc;
+ struct vfsmount *mnt;
+ char *buffer, *p;
+
+ /* Open a new mount context, transferring parameters from the parent
+ * superblock, including the network namespace.
+ */
+ mc = __vfs_fsopen(&nfs_fs_type, dentry->d_sb, 0, 0, MOUNT_TYPE_SUBMOUNT);
+ if (IS_ERR(mc))
+ return ERR_CAST(mc);
+ ctx = container_of(mc, struct nfs_mount_context, mc);
+
+ mnt = ERR_PTR(-ENOMEM);
+ buffer = kmalloc(4096, GFP_USER);
+ if (!buffer)
+ goto err_mc;
+
+ ctx->mount_type = NFS_MOUNT_CROSS_DEV;
+ ctx->selected_flavor = authflavor;
+ ctx->clone_data.sb = dentry->d_sb;
+ ctx->clone_data.dentry = dentry;
+ ctx->clone_data.fattr = fattr;
+ ctx->clone_data.cloned = true;
+
+ nfs_copy_fh(ctx->mntfh, fh);

dprintk("--> nfs_do_submount()\n");
+ dprintk("%s: submounting on %pd2\n", __func__, dentry);

- dprintk("%s: submounting on %pd2\n", __func__,
- dentry);
- if (page == NULL)
- goto out;
- devname = nfs_devname(dentry, page, PAGE_SIZE);
- mnt = (struct vfsmount *)devname;
- if (IS_ERR(devname))
- goto free_page;
- mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), devname, &mountdata);
-free_page:
- free_page((unsigned long)page);
-out:
- dprintk("%s: done\n", __func__);
+ p = nfs_devname(dentry, buffer, 4096);
+ if (IS_ERR(p)) {
+ mc->error = "NFS: Couldn't determine submount pathname";
+ mnt = ERR_CAST(p);
+ goto err_buffer;
+ }

+ ctx->mc.device = kmemdup(p, buffer + 4096 - p, GFP_KERNEL);
+ if (!ctx->mc.device)
+ goto err_buffer;
+ kfree(buffer);
+
+ mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), ctx);
+ goto err_mc;
+
+err_buffer:
+ kfree(buffer);
+err_mc:
+ put_mount_context(mc);
+ dprintk("%s: done\n", __func__);
dprintk("<-- nfs_do_submount() = %p\n", mnt);
return mnt;
}
diff --git a/fs/nfs/nfs3_fs.h b/fs/nfs/nfs3_fs.h
index e134d6548ab7..5f9902dfb54e 100644
--- a/fs/nfs/nfs3_fs.h
+++ b/fs/nfs/nfs3_fs.h
@@ -26,7 +26,7 @@ static inline int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
#endif /* CONFIG_NFS_V3_ACL */

/* nfs3client.c */
-struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
+struct nfs_server *nfs3_create_server(struct nfs_mount_context *);
struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);

diff --git a/fs/nfs/nfs3client.c b/fs/nfs/nfs3client.c
index 7879f2a0fcfd..ce54664e12b5 100644
--- a/fs/nfs/nfs3client.c
+++ b/fs/nfs/nfs3client.c
@@ -45,10 +45,10 @@ static inline void nfs_init_server_aclclient(struct nfs_server *server)
}
#endif

-struct nfs_server *nfs3_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs3_create_server(struct nfs_mount_context *ctx)
{
- struct nfs_server *server = nfs_create_server(mount_info, nfs_mod);
+ struct nfs_server *server = nfs_create_server(ctx);
+
/* Create a client RPC handle for the NFS v3 ACL management interface */
if (!IS_ERR(server))
nfs_init_server_aclclient(server);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index dc925b531f32..1e0349fc33ec 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -922,6 +922,7 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
.file_inode_ops = &nfs3_file_inode_operations,
.file_ops = &nfs_file_operations,
.getroot = nfs3_proc_get_root,
+ .mount = nfs_general_mount,
.submount = nfs_submount,
.try_mount = nfs_try_mount,
.getattr = nfs3_proc_getattr,
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index af285cc27ccf..e85429690089 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -467,7 +467,6 @@ extern const nfs4_stateid zero_stateid;
/* nfs4super.c */
struct nfs_mount_info;
extern struct nfs_subversion nfs_v4;
-struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
extern bool nfs4_disable_idmapping;
extern unsigned short max_session_slots;
extern unsigned short max_session_cb_slots;
@@ -477,6 +476,9 @@ extern bool recover_lost_locks;
#define NFS4_CLIENT_ID_UNIQ_LEN (64)
extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];

+extern struct dentry *nfs4_try_mount(struct nfs_mount_context *);
+extern struct dentry *nfs4_mount(struct nfs_mount_context *);
+
/* nfs4sysctl.c */
#ifdef CONFIG_SYSCTL
int nfs4_register_sysctl(void);
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 8346ccbf2d52..041d79b4c962 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1093,56 +1093,56 @@ static int nfs4_server_common_setup(struct nfs_server *server,
* Create a version 4 volume record
*/
static int nfs4_init_server(struct nfs_server *server,
- struct nfs_parsed_mount_data *data)
+ struct nfs_mount_context *ctx)
{
struct rpc_timeout timeparms;
int error;

dprintk("--> nfs4_init_server()\n");

- nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
- data->timeo, data->retrans);
+ nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
+ ctx->timeo, ctx->retrans);

/* Initialise the client representation from the mount data */
- server->flags = data->flags;
- server->options = data->options;
- server->auth_info = data->auth_info;
+ server->flags = ctx->flags;
+ server->options = ctx->options;
+ server->auth_info = ctx->auth_info;

/* Use the first specified auth flavor. If this flavor isn't
* allowed by the server, use the SECINFO path to try the
* other specified flavors */
- if (data->auth_info.flavor_len >= 1)
- data->selected_flavor = data->auth_info.flavors[0];
+ if (ctx->auth_info.flavor_len >= 1)
+ ctx->selected_flavor = ctx->auth_info.flavors[0];
else
- data->selected_flavor = RPC_AUTH_UNIX;
+ ctx->selected_flavor = RPC_AUTH_UNIX;

/* Get a client record */
error = nfs4_set_client(server,
- data->nfs_server.hostname,
- (const struct sockaddr *)&data->nfs_server.address,
- data->nfs_server.addrlen,
- data->client_address,
- data->nfs_server.protocol,
+ ctx->nfs_server.hostname,
+ (const struct sockaddr *)&ctx->nfs_server.address,
+ ctx->nfs_server.addrlen,
+ ctx->client_address,
+ ctx->nfs_server.protocol,
&timeparms,
- data->minorversion,
- data->net);
+ ctx->minorversion,
+ ctx->mc.net_ns);
if (error < 0)
goto error;

- if (data->rsize)
- server->rsize = nfs_block_size(data->rsize, NULL);
- if (data->wsize)
- server->wsize = nfs_block_size(data->wsize, NULL);
+ if (ctx->rsize)
+ server->rsize = nfs_block_size(ctx->rsize, NULL);
+ if (ctx->wsize)
+ server->wsize = nfs_block_size(ctx->wsize, NULL);

- server->acregmin = data->acregmin * HZ;
- server->acregmax = data->acregmax * HZ;
- server->acdirmin = data->acdirmin * HZ;
- server->acdirmax = data->acdirmax * HZ;
+ server->acregmin = ctx->acregmin * HZ;
+ server->acregmax = ctx->acregmax * HZ;
+ server->acdirmin = ctx->acdirmin * HZ;
+ server->acdirmax = ctx->acdirmax * HZ;

- server->port = data->nfs_server.port;
+ server->port = ctx->nfs_server.port;

error = nfs_init_server_rpcclient(server, &timeparms,
- data->selected_flavor);
+ ctx->selected_flavor);

error:
/* Done */
@@ -1154,10 +1154,7 @@ static int nfs4_init_server(struct nfs_server *server,
* Create a version 4 volume record
* - keyed on server and FSID
*/
-/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
- struct nfs_fh *mntfh)*/
-struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct nfs_server *nfs4_create_server(struct nfs_mount_context *ctx)
{
struct nfs_server *server;
bool auth_probe;
@@ -1169,14 +1166,14 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
if (!server)
return ERR_PTR(-ENOMEM);

- auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
+ auth_probe = ctx->auth_info.flavor_len < 1;

/* set up the general RPC client */
- error = nfs4_init_server(server, mount_info->parsed);
+ error = nfs4_init_server(server, ctx);
if (error < 0)
goto error;

- error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
+ error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
if (error < 0)
goto error;

@@ -1192,8 +1189,7 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
/*
* Create an NFS4 referral server record
*/
-struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
- struct nfs_fh *mntfh)
+struct nfs_server *nfs4_create_referral_server(struct nfs_mount_context *ctx)
{
struct nfs_client *parent_client;
struct nfs_server *server, *parent_server;
@@ -1206,7 +1202,7 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
if (!server)
return ERR_PTR(-ENOMEM);

- parent_server = NFS_SB(data->sb);
+ parent_server = NFS_SB(ctx->clone_data.sb);
parent_client = parent_server->nfs_client;

/* Initialise the client representation from the parent server */
@@ -1214,9 +1210,10 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,

/* Get a client representation.
* Note: NFSv4 always uses TCP, */
- error = nfs4_set_client(server, data->hostname,
- data->addr,
- data->addrlen,
+ error = nfs4_set_client(server,
+ ctx->nfs_server.hostname,
+ (const struct sockaddr *)&ctx->nfs_server.address,
+ ctx->nfs_server.addrlen,
parent_client->cl_ipaddr,
rpc_protocol(parent_server->client),
parent_server->client->cl_timeout,
@@ -1225,13 +1222,14 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
if (error < 0)
goto error;

- error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
+ error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
+ ctx->selected_flavor);
if (error < 0)
goto error;

auth_probe = parent_server->auth_info.flavor_len < 1;

- error = nfs4_server_common_setup(server, mntfh, auth_probe);
+ error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
if (error < 0)
goto error;

diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index d8b040bd9814..2f1af5bdf93a 100644
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -7,6 +7,7 @@
* NFSv4 namespace
*/

+#include <linux/module.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -20,37 +21,64 @@
#include <linux/inet.h>
#include "internal.h"
#include "nfs4_fs.h"
+#include "nfs.h"
#include "dns_resolve.h"

#define NFSDBG_FACILITY NFSDBG_VFS

/*
+ * Work out the length that an NFSv4 path would render to as a standard posix
+ * path, with a leading slash but no terminating slash.
+ */
+static ssize_t nfs4_pathname_len(const struct nfs4_pathname *pathname)
+{
+ ssize_t len;
+ int i;
+
+ for (i = 0; i < pathname->ncomponents; i++) {
+ const struct nfs4_string *component = &pathname->components[i];
+
+ if (component->len > NAME_MAX)
+ goto too_long;
+ len += 1 + component->len; /* Adding "/foo" */
+ if (len > PATH_MAX)
+ goto too_long;
+ }
+ return len;
+
+too_long:
+ return -ENAMETOOLONG;
+}
+
+/*
* Convert the NFSv4 pathname components into a standard posix path.
- *
- * Note that the resulting string will be placed at the end of the buffer
*/
-static inline char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
- char *buffer, ssize_t buflen)
+static char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
+ unsigned short *_len)
{
- char *end = buffer + buflen;
- int n;
+ ssize_t len;
+ char *buf, *p;
+ int i;

- *--end = '\0';
- buflen--;
-
- n = pathname->ncomponents;
- while (--n >= 0) {
- const struct nfs4_string *component = &pathname->components[n];
- buflen -= component->len + 1;
- if (buflen < 0)
- goto Elong;
- end -= component->len;
- memcpy(end, component->data, component->len);
- *--end = '/';
+ len = nfs4_pathname_len(pathname);
+ if (len < 0)
+ return ERR_PTR(len);
+ *_len = len;
+
+ p = buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < pathname->ncomponents; i++) {
+ const struct nfs4_string *component = &pathname->components[i];
+
+ *p++ = '/';
+ memcpy(p, component->data, component->len);
+ p += component->len;
}
- return end;
-Elong:
- return ERR_PTR(-ENAMETOOLONG);
+
+ *p = 0;
+ return buf;
}

/*
@@ -99,21 +127,25 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
*/
static int nfs4_validate_fspath(struct dentry *dentry,
const struct nfs4_fs_locations *locations,
- char *page, char *page2)
+ struct nfs_mount_context *ctx)
{
- const char *path, *fs_path;
+ const char *path;
+ char *buf;
+ int n;

- path = nfs4_path(dentry, page, PAGE_SIZE);
- if (IS_ERR(path))
+ buf = kmalloc(4096, GFP_KERNEL);
+ path = nfs4_path(dentry, buf, 4096);
+ if (IS_ERR(path)) {
+ kfree(buf);
return PTR_ERR(path);
+ }

- fs_path = nfs4_pathname_string(&locations->fs_path, page2, PAGE_SIZE);
- if (IS_ERR(fs_path))
- return PTR_ERR(fs_path);
-
- if (strncmp(path, fs_path, strlen(fs_path)) != 0) {
+ n = strncmp(path, ctx->nfs_server.export_path,
+ ctx->nfs_server.export_path_len);
+ kfree(buf);
+ if (n != 0) {
dprintk("%s: path %s does not begin with fsroot %s\n",
- __func__, path, fs_path);
+ __func__, path, ctx->nfs_server.export_path);
return -ENOENT;
}

@@ -234,56 +266,66 @@ nfs4_negotiate_security(struct rpc_clnt *clnt, struct inode *inode,
return new;
}

-static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
- char *page, char *page2,
+static struct vfsmount *try_location(struct dentry *dentry,
+ struct nfs_mount_context *ctx,
const struct nfs4_fs_location *location)
{
- const size_t addr_bufsize = sizeof(struct sockaddr_storage);
- struct net *net = rpc_net_ns(NFS_SB(mountdata->sb)->client);
+ struct net *net = rpc_net_ns(NFS_SB(dentry->d_sb)->client);
struct vfsmount *mnt = ERR_PTR(-ENOENT);
- char *mnt_path;
- unsigned int maxbuflen;
- unsigned int s;
+ unsigned int len, s;
+ char *p;

- mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
- if (IS_ERR(mnt_path))
- return ERR_CAST(mnt_path);
- mountdata->mnt_path = mnt_path;
- maxbuflen = mnt_path - 1 - page2;
+ /* Allocate a buffer big enough to hold any of the hostnames plus a
+ * terminating char and also a buffer big enough to hold the hostname
+ * plus a colon plus the path.
+ */
+ len = 0;
+ for (s = 0; s < location->nservers; s++) {
+ const struct nfs4_string *buf = &location->servers[s];
+ if (buf->len > len)
+ len = buf->len;
+ }

- mountdata->addr = kmalloc(addr_bufsize, GFP_KERNEL);
- if (mountdata->addr == NULL)
+ ctx->nfs_server.hostname = kmalloc(len + 1, GFP_KERNEL);
+ if (!ctx->nfs_server.hostname)
return ERR_PTR(-ENOMEM);

+ ctx->mc.device = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1,
+ GFP_KERNEL);
+ if (!ctx->mc.device)
+ return ERR_PTR(-ENOMEM);
+
for (s = 0; s < location->nservers; s++) {
const struct nfs4_string *buf = &location->servers[s];

- if (buf->len <= 0 || buf->len >= maxbuflen)
- continue;
-
if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len))
continue;

- mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len,
- mountdata->addr, addr_bufsize, net);
- if (mountdata->addrlen == 0)
+ ctx->nfs_server.addrlen =
+ nfs_parse_server_name(buf->data, buf->len,
+ &ctx->nfs_server.address,
+ sizeof(ctx->nfs_server._address),
+ net);
+ if (ctx->nfs_server.addrlen == 0)
continue;

- rpc_set_port(mountdata->addr, NFS_PORT);
+ rpc_set_port(&ctx->nfs_server.address, NFS_PORT);

- memcpy(page2, buf->data, buf->len);
- page2[buf->len] = '\0';
- mountdata->hostname = page2;
+ memcpy(ctx->nfs_server.hostname, buf->data, buf->len);
+ ctx->nfs_server.hostname[buf->len] = '\0';

- snprintf(page, PAGE_SIZE, "%s:%s",
- mountdata->hostname,
- mountdata->mnt_path);
+ p = ctx->mc.device;
+ memcpy(p, buf->data, buf->len);
+ p += buf->len;
+ *p++ = ':';
+ memcpy(p, ctx->nfs_server.export_path, ctx->nfs_server.export_path_len);
+ p += ctx->nfs_server.export_path_len;
+ *p = 0;

- mnt = vfs_submount(mountdata->dentry, &nfs4_referral_fs_type, page, mountdata);
+ mnt = vfs_submount_mc(ctx->clone_data.dentry, &ctx->mc);
if (!IS_ERR(mnt))
break;
}
- kfree(mountdata->addr);
return mnt;
}

@@ -296,33 +338,42 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
static struct vfsmount *nfs_follow_referral(struct dentry *dentry,
const struct nfs4_fs_locations *locations)
{
- struct vfsmount *mnt = ERR_PTR(-ENOENT);
- struct nfs_clone_mount mountdata = {
- .sb = dentry->d_sb,
- .dentry = dentry,
- .authflavor = NFS_SB(dentry->d_sb)->client->cl_auth->au_flavor,
- };
- char *page = NULL, *page2 = NULL;
+ struct nfs_mount_context *ctx;
+ struct mount_context *mc;
+ struct vfsmount *mnt;
+ char *export_path;
int loc, error;

if (locations == NULL || locations->nlocations <= 0)
goto out;

+ mc = __vfs_fsopen(&nfs4_fs_type, dentry->d_sb, 0, 0, MOUNT_TYPE_SUBMOUNT);
+ if (IS_ERR(mc)) {
+ mnt = ERR_CAST(mc);
+ goto out;
+ }
+ ctx = container_of(mc, struct nfs_mount_context, mc);
+
dprintk("%s: referral at %pd2\n", __func__, dentry);

- page = (char *) __get_free_page(GFP_USER);
- if (!page)
- goto out;
+ ctx->mount_type = NFS4_MOUNT_REFERRAL;
+ ctx->clone_data.sb = dentry->d_sb;
+ ctx->clone_data.dentry = dentry;
+ ctx->clone_data.cloned = true;

- page2 = (char *) __get_free_page(GFP_USER);
- if (!page2)
- goto out;
+ export_path = nfs4_pathname_string(&locations->fs_path,
+ &ctx->nfs_server.export_path_len);
+ if (IS_ERR(export_path)) {
+ mnt = ERR_CAST(export_path);
+ goto out_mc;
+ }
+ ctx->nfs_server.export_path = export_path;

/* Ensure fs path is a prefix of current dentry path */
- error = nfs4_validate_fspath(dentry, locations, page, page2);
+ error = nfs4_validate_fspath(dentry, locations, ctx);
if (error < 0) {
mnt = ERR_PTR(error);
- goto out;
+ goto out_mc;
}

for (loc = 0; loc < locations->nlocations; loc++) {
@@ -332,14 +383,14 @@ static struct vfsmount *nfs_follow_referral(struct dentry *dentry,
location->rootpath.ncomponents == 0)
continue;

- mnt = try_location(&mountdata, page, page2, location);
+ mnt = try_location(ctx->clone_data.dentry, ctx, location);
if (!IS_ERR(mnt))
break;
}

+out_mc:
+ put_mount_context(mc);
out:
- free_page((unsigned long) page);
- free_page((unsigned long) page2);
dprintk("%s: done\n", __func__);
return mnt;
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 201ca3f2c4ba..32d8c10bc45e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -9318,6 +9318,7 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
.file_inode_ops = &nfs4_file_inode_operations,
.file_ops = &nfs4_file_operations,
.getroot = nfs4_proc_get_root,
+ .mount = nfs4_mount,
.submount = nfs4_submount,
.try_mount = nfs4_try_mount,
.getattr = nfs4_proc_getattr,
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index 6fb7cb6b3f4b..a71cea1ff0e1 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -17,36 +17,9 @@

static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc);
static void nfs4_evict_inode(struct inode *inode);
-static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-
-static struct file_system_type nfs4_remote_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-
-static struct file_system_type nfs4_remote_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_remote_referral_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-
-struct file_system_type nfs4_referral_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs4_referral_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
+static struct dentry *nfs4_remote_mount(struct nfs_mount_context *ctx);
+static struct dentry *nfs4_referral_mount(struct nfs_mount_context *ctx);
+static struct dentry *nfs4_remote_referral_mount(struct nfs_mount_context *ctx);

static const struct super_operations nfs4_sops = {
.alloc_inode = nfs_alloc_inode,
@@ -60,16 +33,16 @@ static const struct super_operations nfs4_sops = {
.show_devname = nfs_show_devname,
.show_path = nfs_show_path,
.show_stats = nfs_show_stats,
- .remount_fs = nfs_remount,
+ .remount_fs_mc = nfs_remount,
};

struct nfs_subversion nfs_v4 = {
- .owner = THIS_MODULE,
- .nfs_fs = &nfs4_fs_type,
- .rpc_vers = &nfs_version4,
- .rpc_ops = &nfs_v4_clientops,
- .sops = &nfs4_sops,
- .xattr = nfs4_xattr_handlers,
+ .owner = THIS_MODULE,
+ .nfs_fs = &nfs4_fs_type,
+ .rpc_vers = &nfs_version4,
+ .rpc_ops = &nfs_v4_clientops,
+ .sops = &nfs4_sops,
+ .xattr = nfs4_xattr_handlers,
};

static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc)
@@ -103,47 +76,58 @@ static void nfs4_evict_inode(struct inode *inode)
/*
* Get the superblock for the NFS4 root partition
*/
-static struct dentry *
-nfs4_remote_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *info)
+static struct dentry *nfs4_remote_mount(struct nfs_mount_context *ctx)
{
- struct nfs_mount_info *mount_info = info;
struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);

- mount_info->set_security = nfs_set_sb_security;
+ ctx->set_security = nfs_set_sb_security;

/* Get a volume representation */
- server = nfs4_create_server(mount_info, &nfs_v4);
- if (IS_ERR(server)) {
- mntroot = ERR_CAST(server);
- goto out;
- }
-
- mntroot = nfs_fs_mount_common(server, flags, dev_name, mount_info, &nfs_v4);
+ server = nfs4_create_server(ctx);
+ if (IS_ERR(server))
+ return ERR_CAST(server);

-out:
- return mntroot;
+ return nfs_fs_mount_common(server, ctx);
}

-static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
- int flags, void *data, const char *hostname)
+/*
+ * Create a mount for the root of the server. We copy the mount context we
+ * have for the parameters and set its hostname, path and type.
+ */
+static struct vfsmount *nfs_do_root_mount(struct nfs_mount_context *ctx,
+ const char *hostname,
+ enum nfs_mount_type type)
{
+ struct nfs_mount_context *root_ctx;
+ struct mount_context *root_mc;
struct vfsmount *root_mnt;
char *root_devname;
size_t len;

+ root_mc = vfs_dup_mount_context(&ctx->mc);
+ if (IS_ERR(root_mc))
+ return ERR_CAST(root_mc);
+ root_ctx = container_of(root_mc, struct nfs_mount_context, mc);
+
+ root_ctx->mount_type = type;
+ root_ctx->nfs_server.export_path = (char *)nfs_slash;
+
len = strlen(hostname) + 5;
+ root_mnt = ERR_PTR(-ENOMEM);
root_devname = kmalloc(len, GFP_KERNEL);
if (root_devname == NULL)
- return ERR_PTR(-ENOMEM);
+ goto out_mc;
+
/* Does hostname needs to be enclosed in brackets? */
if (strchr(hostname, ':'))
snprintf(root_devname, len, "[%s]:/", hostname);
else
snprintf(root_devname, len, "%s:/", hostname);
- root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
- kfree(root_devname);
+ root_ctx->mc.device = root_devname;
+
+ root_mnt = vfs_kern_mount_mc(&root_ctx->mc);
+out_mc:
+ put_mount_context(root_mc);
return root_mnt;
}

@@ -234,24 +218,24 @@ static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
return dentry;
}

-struct dentry *nfs4_try_mount(int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct dentry *nfs4_try_mount(struct nfs_mount_context *ctx)
{
- char *export_path;
struct vfsmount *root_mnt;
struct dentry *res;
- struct nfs_parsed_mount_data *data = mount_info->parsed;

dfprintk(MOUNT, "--> nfs4_try_mount()\n");

- export_path = data->nfs_server.export_path;
- data->nfs_server.export_path = "/";
- root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
- data->nfs_server.hostname);
- data->nfs_server.export_path = export_path;
+ /* We create a mount for the server's root, walk to the requested
+ * location and then create another mount for that.
+ */
+ root_mnt = nfs_do_root_mount(ctx, ctx->nfs_server.hostname,
+ NFS4_MOUNT_REMOTE);
+ if (IS_ERR(root_mnt))
+ return ERR_CAST(root_mnt);

- res = nfs_follow_remote_path(root_mnt, export_path);
+ res = nfs_follow_remote_path(root_mnt, ctx->nfs_server.export_path);
+ if (res < 0)
+ ctx->mc.error = "NFS4: Couldn't follow remote path";

dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n",
PTR_ERR_OR_ZERO(res),
@@ -259,64 +243,64 @@ struct dentry *nfs4_try_mount(int flags, const char *dev_name,
return res;
}

-static struct dentry *
-nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
+static struct dentry *nfs4_remote_referral_mount(struct nfs_mount_context *ctx)
{
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_fill_super,
- .set_security = nfs_clone_sb_security,
- .cloned = raw_data,
- };
struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);

dprintk("--> nfs4_referral_get_sb()\n");

- mount_info.mntfh = nfs_alloc_fhandle();
- if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
- goto out;
+ ctx->set_security = nfs_clone_sb_security;
+
+ if (!ctx->clone_data.cloned)
+ return ERR_PTR(-EINVAL);

/* create a new volume representation */
- server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
- if (IS_ERR(server)) {
- mntroot = ERR_CAST(server);
- goto out;
- }
+ server = nfs4_create_referral_server(ctx);
+ if (IS_ERR(server))
+ return ERR_CAST(server);

- mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, &nfs_v4);
-out:
- nfs_free_fhandle(mount_info.mntfh);
- return mntroot;
+ return nfs_fs_mount_common(server, ctx);
}

/*
* Create an NFS4 server record on referral traversal
*/
-static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
+static struct dentry *nfs4_referral_mount(struct nfs_mount_context *ctx)
{
- struct nfs_clone_mount *data = raw_data;
- char *export_path;
struct vfsmount *root_mnt;
struct dentry *res;

dprintk("--> nfs4_referral_mount()\n");

- export_path = data->mnt_path;
- data->mnt_path = "/";
-
- root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
- flags, data, data->hostname);
- data->mnt_path = export_path;
+ root_mnt = nfs_do_root_mount(ctx, ctx->nfs_server.hostname,
+ NFS4_MOUNT_REMOTE_REFERRAL);

- res = nfs_follow_remote_path(root_mnt, export_path);
+ res = nfs_follow_remote_path(root_mnt, ctx->nfs_server.export_path);
dprintk("<-- nfs4_referral_mount() = %d%s\n",
PTR_ERR_OR_ZERO(res),
IS_ERR(res) ? " [error]" : "");
return res;
}

+/*
+ * Handle special NFS4 mount types.
+ */
+struct dentry *nfs4_mount(struct nfs_mount_context *ctx)
+{
+ switch (ctx->mount_type) {
+ case NFS4_MOUNT_REMOTE:
+ return nfs4_remote_mount(ctx);
+
+ case NFS4_MOUNT_REFERRAL:
+ return nfs4_referral_mount(ctx);
+
+ case NFS4_MOUNT_REMOTE_REFERRAL:
+ return nfs4_remote_referral_mount(ctx);
+
+ default:
+ return nfs_general_mount(ctx);
+ }
+}

static int __init init_nfs_v4(void)
{
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index b7bca8303989..edae9cd50412 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -704,6 +704,7 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
.file_inode_ops = &nfs_file_inode_operations,
.file_ops = &nfs_file_operations,
.getroot = nfs_proc_get_root,
+ .mount = nfs_general_mount,
.submount = nfs_submount,
.try_mount = nfs_try_mount,
.getattr = nfs_proc_getattr,
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index dc69314d455e..82d4a3071517 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -68,244 +68,6 @@
#include "nfs.h"

#define NFSDBG_FACILITY NFSDBG_VFS
-#define NFS_TEXT_DATA 1
-
-#if IS_ENABLED(CONFIG_NFS_V3)
-#define NFS_DEFAULT_VERSION 3
-#else
-#define NFS_DEFAULT_VERSION 2
-#endif
-
-enum {
- /* Mount options that take no arguments */
- Opt_soft, Opt_hard,
- Opt_posix, Opt_noposix,
- Opt_cto, Opt_nocto,
- Opt_ac, Opt_noac,
- Opt_lock, Opt_nolock,
- Opt_udp, Opt_tcp, Opt_rdma,
- Opt_acl, Opt_noacl,
- Opt_rdirplus, Opt_nordirplus,
- Opt_sharecache, Opt_nosharecache,
- Opt_resvport, Opt_noresvport,
- Opt_fscache, Opt_nofscache,
- Opt_migration, Opt_nomigration,
-
- /* Mount options that take integer arguments */
- Opt_port,
- Opt_rsize, Opt_wsize, Opt_bsize,
- Opt_timeo, Opt_retrans,
- Opt_acregmin, Opt_acregmax,
- Opt_acdirmin, Opt_acdirmax,
- Opt_actimeo,
- Opt_namelen,
- Opt_mountport,
- Opt_mountvers,
- Opt_minorversion,
-
- /* Mount options that take string arguments */
- Opt_nfsvers,
- Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
- Opt_addr, Opt_mountaddr, Opt_clientaddr,
- Opt_lookupcache,
- Opt_fscache_uniq,
- Opt_local_lock,
-
- /* Special mount options */
- Opt_userspace, Opt_deprecated, Opt_sloppy,
-
- Opt_err
-};
-
-static const match_table_t nfs_mount_option_tokens = {
- { Opt_userspace, "bg" },
- { Opt_userspace, "fg" },
- { Opt_userspace, "retry=%s" },
-
- { Opt_sloppy, "sloppy" },
-
- { Opt_soft, "soft" },
- { Opt_hard, "hard" },
- { Opt_deprecated, "intr" },
- { Opt_deprecated, "nointr" },
- { Opt_posix, "posix" },
- { Opt_noposix, "noposix" },
- { Opt_cto, "cto" },
- { Opt_nocto, "nocto" },
- { Opt_ac, "ac" },
- { Opt_noac, "noac" },
- { Opt_lock, "lock" },
- { Opt_nolock, "nolock" },
- { Opt_udp, "udp" },
- { Opt_tcp, "tcp" },
- { Opt_rdma, "rdma" },
- { Opt_acl, "acl" },
- { Opt_noacl, "noacl" },
- { Opt_rdirplus, "rdirplus" },
- { Opt_nordirplus, "nordirplus" },
- { Opt_sharecache, "sharecache" },
- { Opt_nosharecache, "nosharecache" },
- { Opt_resvport, "resvport" },
- { Opt_noresvport, "noresvport" },
- { Opt_fscache, "fsc" },
- { Opt_nofscache, "nofsc" },
- { Opt_migration, "migration" },
- { Opt_nomigration, "nomigration" },
-
- { Opt_port, "port=%s" },
- { Opt_rsize, "rsize=%s" },
- { Opt_wsize, "wsize=%s" },
- { Opt_bsize, "bsize=%s" },
- { Opt_timeo, "timeo=%s" },
- { Opt_retrans, "retrans=%s" },
- { Opt_acregmin, "acregmin=%s" },
- { Opt_acregmax, "acregmax=%s" },
- { Opt_acdirmin, "acdirmin=%s" },
- { Opt_acdirmax, "acdirmax=%s" },
- { Opt_actimeo, "actimeo=%s" },
- { Opt_namelen, "namlen=%s" },
- { Opt_mountport, "mountport=%s" },
- { Opt_mountvers, "mountvers=%s" },
- { Opt_minorversion, "minorversion=%s" },
-
- { Opt_nfsvers, "nfsvers=%s" },
- { Opt_nfsvers, "vers=%s" },
-
- { Opt_sec, "sec=%s" },
- { Opt_proto, "proto=%s" },
- { Opt_mountproto, "mountproto=%s" },
- { Opt_addr, "addr=%s" },
- { Opt_clientaddr, "clientaddr=%s" },
- { Opt_mounthost, "mounthost=%s" },
- { Opt_mountaddr, "mountaddr=%s" },
-
- { Opt_lookupcache, "lookupcache=%s" },
- { Opt_fscache_uniq, "fsc=%s" },
- { Opt_local_lock, "local_lock=%s" },
-
- /* The following needs to be listed after all other options */
- { Opt_nfsvers, "v%s" },
-
- { Opt_err, NULL }
-};
-
-enum {
- Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
- Opt_xprt_rdma6,
-
- Opt_xprt_err
-};
-
-static const match_table_t nfs_xprt_protocol_tokens = {
- { Opt_xprt_udp, "udp" },
- { Opt_xprt_udp6, "udp6" },
- { Opt_xprt_tcp, "tcp" },
- { Opt_xprt_tcp6, "tcp6" },
- { Opt_xprt_rdma, "rdma" },
- { Opt_xprt_rdma6, "rdma6" },
-
- { Opt_xprt_err, NULL }
-};
-
-enum {
- Opt_sec_none, Opt_sec_sys,
- Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
- Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
- Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
-
- Opt_sec_err
-};
-
-static const match_table_t nfs_secflavor_tokens = {
- { Opt_sec_none, "none" },
- { Opt_sec_none, "null" },
- { Opt_sec_sys, "sys" },
-
- { Opt_sec_krb5, "krb5" },
- { Opt_sec_krb5i, "krb5i" },
- { Opt_sec_krb5p, "krb5p" },
-
- { Opt_sec_lkey, "lkey" },
- { Opt_sec_lkeyi, "lkeyi" },
- { Opt_sec_lkeyp, "lkeyp" },
-
- { Opt_sec_spkm, "spkm3" },
- { Opt_sec_spkmi, "spkm3i" },
- { Opt_sec_spkmp, "spkm3p" },
-
- { Opt_sec_err, NULL }
-};
-
-enum {
- Opt_lookupcache_all, Opt_lookupcache_positive,
- Opt_lookupcache_none,
-
- Opt_lookupcache_err
-};
-
-static match_table_t nfs_lookupcache_tokens = {
- { Opt_lookupcache_all, "all" },
- { Opt_lookupcache_positive, "pos" },
- { Opt_lookupcache_positive, "positive" },
- { Opt_lookupcache_none, "none" },
-
- { Opt_lookupcache_err, NULL }
-};
-
-enum {
- Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
- Opt_local_lock_none,
-
- Opt_local_lock_err
-};
-
-static match_table_t nfs_local_lock_tokens = {
- { Opt_local_lock_all, "all" },
- { Opt_local_lock_flock, "flock" },
- { Opt_local_lock_posix, "posix" },
- { Opt_local_lock_none, "none" },
-
- { Opt_local_lock_err, NULL }
-};
-
-enum {
- Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
- Opt_vers_4_1, Opt_vers_4_2,
-
- Opt_vers_err
-};
-
-static match_table_t nfs_vers_tokens = {
- { Opt_vers_2, "2" },
- { Opt_vers_3, "3" },
- { Opt_vers_4, "4" },
- { Opt_vers_4_0, "4.0" },
- { Opt_vers_4_1, "4.1" },
- { Opt_vers_4_2, "4.2" },
-
- { Opt_vers_err, NULL }
-};
-
-static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data);
-
-struct file_system_type nfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs",
- .mount = nfs_fs_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-MODULE_ALIAS_FS("nfs");
-EXPORT_SYMBOL_GPL(nfs_fs_type);
-
-struct file_system_type nfs_xdev_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs",
- .mount = nfs_xdev_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};

const struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
@@ -319,26 +81,11 @@ const struct super_operations nfs_sops = {
.show_devname = nfs_show_devname,
.show_path = nfs_show_path,
.show_stats = nfs_show_stats,
- .remount_fs = nfs_remount,
+ .remount_fs_mc = nfs_remount,
};
EXPORT_SYMBOL_GPL(nfs_sops);

#if IS_ENABLED(CONFIG_NFS_V4)
-static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
-static int nfs4_validate_mount_data(void *options,
- struct nfs_parsed_mount_data *args, const char *dev_name);
-
-struct file_system_type nfs4_fs_type = {
- .owner = THIS_MODULE,
- .name = "nfs4",
- .mount = nfs_fs_mount,
- .kill_sb = nfs_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
-};
-MODULE_ALIAS_FS("nfs4");
-MODULE_ALIAS("nfs4");
-EXPORT_SYMBOL_GPL(nfs4_fs_type);
-
static int __init register_nfs4_fs(void)
{
return register_filesystem(&nfs4_fs_type);
@@ -910,141 +657,6 @@ void nfs_umount_begin(struct super_block *sb)
}
EXPORT_SYMBOL_GPL(nfs_umount_begin);

-static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
-{
- struct nfs_parsed_mount_data *data;
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (data) {
- data->timeo = NFS_UNSPEC_TIMEO;
- data->retrans = NFS_UNSPEC_RETRANS;
- data->acregmin = NFS_DEF_ACREGMIN;
- data->acregmax = NFS_DEF_ACREGMAX;
- data->acdirmin = NFS_DEF_ACDIRMIN;
- data->acdirmax = NFS_DEF_ACDIRMAX;
- data->mount_server.port = NFS_UNSPEC_PORT;
- data->nfs_server.port = NFS_UNSPEC_PORT;
- data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- data->selected_flavor = RPC_AUTH_MAXFLAVOR;
- data->minorversion = 0;
- data->need_mount = true;
- data->net = current->nsproxy->net_ns;
- security_init_mnt_opts(&data->lsm_opts);
- }
- return data;
-}
-
-static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
-{
- if (data) {
- kfree(data->client_address);
- kfree(data->mount_server.hostname);
- kfree(data->nfs_server.export_path);
- kfree(data->nfs_server.hostname);
- kfree(data->fscache_uniq);
- security_free_mnt_opts(&data->lsm_opts);
- kfree(data);
- }
-}
-
-/*
- * Sanity-check a server address provided by the mount command.
- *
- * Address family must be initialized, and address must not be
- * the ANY address for that family.
- */
-static int nfs_verify_server_address(struct sockaddr *addr)
-{
- switch (addr->sa_family) {
- case AF_INET: {
- struct sockaddr_in *sa = (struct sockaddr_in *)addr;
- return sa->sin_addr.s_addr != htonl(INADDR_ANY);
- }
- case AF_INET6: {
- struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
- return !ipv6_addr_any(sa);
- }
- }
-
- dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
- return 0;
-}
-
-/*
- * Select between a default port value and a user-specified port value.
- * If a zero value is set, then autobind will be used.
- */
-static void nfs_set_port(struct sockaddr *sap, int *port,
- const unsigned short default_port)
-{
- if (*port == NFS_UNSPEC_PORT)
- *port = default_port;
-
- rpc_set_port(sap, *port);
-}
-
-/*
- * Sanity check the NFS transport protocol.
- *
- */
-static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
-{
- switch (mnt->nfs_server.protocol) {
- case XPRT_TRANSPORT_UDP:
- case XPRT_TRANSPORT_TCP:
- case XPRT_TRANSPORT_RDMA:
- break;
- default:
- mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- }
-}
-
-/*
- * For text based NFSv2/v3 mounts, the mount protocol transport default
- * settings should depend upon the specified NFS transport.
- */
-static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
-{
- nfs_validate_transport_protocol(mnt);
-
- if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
- mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
- return;
- switch (mnt->nfs_server.protocol) {
- case XPRT_TRANSPORT_UDP:
- mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case XPRT_TRANSPORT_TCP:
- case XPRT_TRANSPORT_RDMA:
- mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
- }
-}
-
-/*
- * Add 'flavor' to 'auth_info' if not already present.
- * Returns true if 'flavor' ends up in the list, false otherwise
- */
-static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
- rpc_authflavor_t flavor)
-{
- unsigned int i;
- unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
-
- /* make sure this flavor isn't already in the list */
- for (i = 0; i < auth_info->flavor_len; i++) {
- if (flavor == auth_info->flavors[i])
- return true;
- }
-
- if (auth_info->flavor_len + 1 >= max_flavor_len) {
- dfprintk(MOUNT, "NFS: too many sec= flavors\n");
- return false;
- }
-
- auth_info->flavors[auth_info->flavor_len++] = flavor;
- return true;
-}
-
/*
* Return true if 'match' is in auth_info or auth_info is empty.
* Return false otherwise.
@@ -1066,628 +678,11 @@ bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
EXPORT_SYMBOL_GPL(nfs_auth_info_match);

/*
- * Parse the value of the 'sec=' option.
- */
-static int nfs_parse_security_flavors(char *value,
- struct nfs_parsed_mount_data *mnt)
-{
- substring_t args[MAX_OPT_ARGS];
- rpc_authflavor_t pseudoflavor;
- char *p;
-
- dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
-
- while ((p = strsep(&value, ":")) != NULL) {
- switch (match_token(p, nfs_secflavor_tokens, args)) {
- case Opt_sec_none:
- pseudoflavor = RPC_AUTH_NULL;
- break;
- case Opt_sec_sys:
- pseudoflavor = RPC_AUTH_UNIX;
- break;
- case Opt_sec_krb5:
- pseudoflavor = RPC_AUTH_GSS_KRB5;
- break;
- case Opt_sec_krb5i:
- pseudoflavor = RPC_AUTH_GSS_KRB5I;
- break;
- case Opt_sec_krb5p:
- pseudoflavor = RPC_AUTH_GSS_KRB5P;
- break;
- case Opt_sec_lkey:
- pseudoflavor = RPC_AUTH_GSS_LKEY;
- break;
- case Opt_sec_lkeyi:
- pseudoflavor = RPC_AUTH_GSS_LKEYI;
- break;
- case Opt_sec_lkeyp:
- pseudoflavor = RPC_AUTH_GSS_LKEYP;
- break;
- case Opt_sec_spkm:
- pseudoflavor = RPC_AUTH_GSS_SPKM;
- break;
- case Opt_sec_spkmi:
- pseudoflavor = RPC_AUTH_GSS_SPKMI;
- break;
- case Opt_sec_spkmp:
- pseudoflavor = RPC_AUTH_GSS_SPKMP;
- break;
- default:
- dfprintk(MOUNT,
- "NFS: sec= option '%s' not recognized\n", p);
- return 0;
- }
-
- if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
- return 0;
- }
-
- return 1;
-}
-
-static int nfs_parse_version_string(char *string,
- struct nfs_parsed_mount_data *mnt,
- substring_t *args)
-{
- mnt->flags &= ~NFS_MOUNT_VER3;
- switch (match_token(string, nfs_vers_tokens, args)) {
- case Opt_vers_2:
- mnt->version = 2;
- break;
- case Opt_vers_3:
- mnt->flags |= NFS_MOUNT_VER3;
- mnt->version = 3;
- break;
- case Opt_vers_4:
- /* Backward compatibility option. In future,
- * the mount program should always supply
- * a NFSv4 minor version number.
- */
- mnt->version = 4;
- break;
- case Opt_vers_4_0:
- mnt->version = 4;
- mnt->minorversion = 0;
- break;
- case Opt_vers_4_1:
- mnt->version = 4;
- mnt->minorversion = 1;
- break;
- case Opt_vers_4_2:
- mnt->version = 4;
- mnt->minorversion = 2;
- break;
- default:
- return 0;
- }
- return 1;
-}
-
-static int nfs_get_option_str(substring_t args[], char **option)
-{
- kfree(*option);
- *option = match_strdup(args);
- return !*option;
-}
-
-static int nfs_get_option_ul(substring_t args[], unsigned long *option)
-{
- int rc;
- char *string;
-
- string = match_strdup(args);
- if (string == NULL)
- return -ENOMEM;
- rc = kstrtoul(string, 10, option);
- kfree(string);
-
- return rc;
-}
-
-static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
- unsigned long l_bound, unsigned long u_bound)
-{
- int ret;
-
- ret = nfs_get_option_ul(args, option);
- if (ret != 0)
- return ret;
- if (*option < l_bound || *option > u_bound)
- return -ERANGE;
- return 0;
-}
-
-/*
- * Error-check and convert a string of mount options from user space into
- * a data structure. The whole mount string is processed; bad options are
- * skipped as they are encountered. If there were no errors, return 1;
- * otherwise return 0 (zero).
- */
-static int nfs_parse_mount_options(char *raw,
- struct nfs_parsed_mount_data *mnt)
-{
- char *p, *string, *secdata;
- int rc, sloppy = 0, invalid_option = 0;
- unsigned short protofamily = AF_UNSPEC;
- unsigned short mountfamily = AF_UNSPEC;
-
- if (!raw) {
- dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
- return 1;
- }
- dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
-
- secdata = alloc_secdata();
- if (!secdata)
- goto out_nomem;
-
- rc = security_sb_copy_data(raw, secdata);
- if (rc)
- goto out_security_failure;
-
- rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
- if (rc)
- goto out_security_failure;
-
- free_secdata(secdata);
-
- while ((p = strsep(&raw, ",")) != NULL) {
- substring_t args[MAX_OPT_ARGS];
- unsigned long option;
- int token;
-
- if (!*p)
- continue;
-
- dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
-
- token = match_token(p, nfs_mount_option_tokens, args);
- switch (token) {
-
- /*
- * boolean options: foo/nofoo
- */
- case Opt_soft:
- mnt->flags |= NFS_MOUNT_SOFT;
- break;
- case Opt_hard:
- mnt->flags &= ~NFS_MOUNT_SOFT;
- break;
- case Opt_posix:
- mnt->flags |= NFS_MOUNT_POSIX;
- break;
- case Opt_noposix:
- mnt->flags &= ~NFS_MOUNT_POSIX;
- break;
- case Opt_cto:
- mnt->flags &= ~NFS_MOUNT_NOCTO;
- break;
- case Opt_nocto:
- mnt->flags |= NFS_MOUNT_NOCTO;
- break;
- case Opt_ac:
- mnt->flags &= ~NFS_MOUNT_NOAC;
- break;
- case Opt_noac:
- mnt->flags |= NFS_MOUNT_NOAC;
- break;
- case Opt_lock:
- mnt->flags &= ~NFS_MOUNT_NONLM;
- mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- case Opt_nolock:
- mnt->flags |= NFS_MOUNT_NONLM;
- mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- case Opt_udp:
- mnt->flags &= ~NFS_MOUNT_TCP;
- mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_tcp:
- mnt->flags |= NFS_MOUNT_TCP;
- mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_rdma:
- mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
- mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
- xprt_load_transport(p);
- break;
- case Opt_acl:
- mnt->flags &= ~NFS_MOUNT_NOACL;
- break;
- case Opt_noacl:
- mnt->flags |= NFS_MOUNT_NOACL;
- break;
- case Opt_rdirplus:
- mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
- break;
- case Opt_nordirplus:
- mnt->flags |= NFS_MOUNT_NORDIRPLUS;
- break;
- case Opt_sharecache:
- mnt->flags &= ~NFS_MOUNT_UNSHARED;
- break;
- case Opt_nosharecache:
- mnt->flags |= NFS_MOUNT_UNSHARED;
- break;
- case Opt_resvport:
- mnt->flags &= ~NFS_MOUNT_NORESVPORT;
- break;
- case Opt_noresvport:
- mnt->flags |= NFS_MOUNT_NORESVPORT;
- break;
- case Opt_fscache:
- mnt->options |= NFS_OPTION_FSCACHE;
- kfree(mnt->fscache_uniq);
- mnt->fscache_uniq = NULL;
- break;
- case Opt_nofscache:
- mnt->options &= ~NFS_OPTION_FSCACHE;
- kfree(mnt->fscache_uniq);
- mnt->fscache_uniq = NULL;
- break;
- case Opt_migration:
- mnt->options |= NFS_OPTION_MIGRATION;
- break;
- case Opt_nomigration:
- mnt->options &= NFS_OPTION_MIGRATION;
- break;
-
- /*
- * options that take numeric values
- */
- case Opt_port:
- if (nfs_get_option_ul(args, &option) ||
- option > USHRT_MAX)
- goto out_invalid_value;
- mnt->nfs_server.port = option;
- break;
- case Opt_rsize:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->rsize = option;
- break;
- case Opt_wsize:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->wsize = option;
- break;
- case Opt_bsize:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->bsize = option;
- break;
- case Opt_timeo:
- if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
- goto out_invalid_value;
- mnt->timeo = option;
- break;
- case Opt_retrans:
- if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
- goto out_invalid_value;
- mnt->retrans = option;
- break;
- case Opt_acregmin:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->acregmin = option;
- break;
- case Opt_acregmax:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->acregmax = option;
- break;
- case Opt_acdirmin:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->acdirmin = option;
- break;
- case Opt_acdirmax:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->acdirmax = option;
- break;
- case Opt_actimeo:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->acregmin = mnt->acregmax =
- mnt->acdirmin = mnt->acdirmax = option;
- break;
- case Opt_namelen:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- mnt->namlen = option;
- break;
- case Opt_mountport:
- if (nfs_get_option_ul(args, &option) ||
- option > USHRT_MAX)
- goto out_invalid_value;
- mnt->mount_server.port = option;
- break;
- case Opt_mountvers:
- if (nfs_get_option_ul(args, &option) ||
- option < NFS_MNT_VERSION ||
- option > NFS_MNT3_VERSION)
- goto out_invalid_value;
- mnt->mount_server.version = option;
- break;
- case Opt_minorversion:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- if (option > NFS4_MAX_MINOR_VERSION)
- goto out_invalid_value;
- mnt->minorversion = option;
- break;
-
- /*
- * options that take text values
- */
- case Opt_nfsvers:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = nfs_parse_version_string(string, mnt, args);
- kfree(string);
- if (!rc)
- goto out_invalid_value;
- break;
- case Opt_sec:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = nfs_parse_security_flavors(string, mnt);
- kfree(string);
- if (!rc) {
- dfprintk(MOUNT, "NFS: unrecognized "
- "security flavor\n");
- return 0;
- }
- break;
- case Opt_proto:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- token = match_token(string,
- nfs_xprt_protocol_tokens, args);
-
- protofamily = AF_INET;
- switch (token) {
- case Opt_xprt_udp6:
- protofamily = AF_INET6;
- case Opt_xprt_udp:
- mnt->flags &= ~NFS_MOUNT_TCP;
- mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_xprt_tcp6:
- protofamily = AF_INET6;
- case Opt_xprt_tcp:
- mnt->flags |= NFS_MOUNT_TCP;
- mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_xprt_rdma6:
- protofamily = AF_INET6;
- case Opt_xprt_rdma:
- /* vector side protocols to TCP */
- mnt->flags |= NFS_MOUNT_TCP;
- mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
- xprt_load_transport(string);
- break;
- default:
- dfprintk(MOUNT, "NFS: unrecognized "
- "transport protocol\n");
- kfree(string);
- return 0;
- }
- kfree(string);
- break;
- case Opt_mountproto:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- token = match_token(string,
- nfs_xprt_protocol_tokens, args);
- kfree(string);
-
- mountfamily = AF_INET;
- switch (token) {
- case Opt_xprt_udp6:
- mountfamily = AF_INET6;
- case Opt_xprt_udp:
- mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
- break;
- case Opt_xprt_tcp6:
- mountfamily = AF_INET6;
- case Opt_xprt_tcp:
- mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
- break;
- case Opt_xprt_rdma: /* not used for side protocols */
- default:
- dfprintk(MOUNT, "NFS: unrecognized "
- "transport protocol\n");
- return 0;
- }
- break;
- case Opt_addr:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- mnt->nfs_server.addrlen =
- rpc_pton(mnt->net, string, strlen(string),
- (struct sockaddr *)
- &mnt->nfs_server.address,
- sizeof(mnt->nfs_server.address));
- kfree(string);
- if (mnt->nfs_server.addrlen == 0)
- goto out_invalid_address;
- break;
- case Opt_clientaddr:
- if (nfs_get_option_str(args, &mnt->client_address))
- goto out_nomem;
- break;
- case Opt_mounthost:
- if (nfs_get_option_str(args,
- &mnt->mount_server.hostname))
- goto out_nomem;
- break;
- case Opt_mountaddr:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- mnt->mount_server.addrlen =
- rpc_pton(mnt->net, string, strlen(string),
- (struct sockaddr *)
- &mnt->mount_server.address,
- sizeof(mnt->mount_server.address));
- kfree(string);
- if (mnt->mount_server.addrlen == 0)
- goto out_invalid_address;
- break;
- case Opt_lookupcache:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- token = match_token(string,
- nfs_lookupcache_tokens, args);
- kfree(string);
- switch (token) {
- case Opt_lookupcache_all:
- mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
- break;
- case Opt_lookupcache_positive:
- mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
- mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
- break;
- case Opt_lookupcache_none:
- mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
- break;
- default:
- dfprintk(MOUNT, "NFS: invalid "
- "lookupcache argument\n");
- return 0;
- };
- break;
- case Opt_fscache_uniq:
- if (nfs_get_option_str(args, &mnt->fscache_uniq))
- goto out_nomem;
- mnt->options |= NFS_OPTION_FSCACHE;
- break;
- case Opt_local_lock:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- token = match_token(string, nfs_local_lock_tokens,
- args);
- kfree(string);
- switch (token) {
- case Opt_local_lock_all:
- mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- case Opt_local_lock_flock:
- mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
- break;
- case Opt_local_lock_posix:
- mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
- break;
- case Opt_local_lock_none:
- mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
- NFS_MOUNT_LOCAL_FCNTL);
- break;
- default:
- dfprintk(MOUNT, "NFS: invalid "
- "local_lock argument\n");
- return 0;
- };
- break;
-
- /*
- * Special options
- */
- case Opt_sloppy:
- sloppy = 1;
- dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
- break;
- case Opt_userspace:
- case Opt_deprecated:
- dfprintk(MOUNT, "NFS: ignoring mount option "
- "'%s'\n", p);
- break;
-
- default:
- invalid_option = 1;
- dfprintk(MOUNT, "NFS: unrecognized mount option "
- "'%s'\n", p);
- }
- }
-
- if (!sloppy && invalid_option)
- return 0;
-
- if (mnt->minorversion && mnt->version != 4)
- goto out_minorversion_mismatch;
-
- if (mnt->options & NFS_OPTION_MIGRATION &&
- (mnt->version != 4 || mnt->minorversion != 0))
- goto out_migration_misuse;
-
- /*
- * verify that any proto=/mountproto= options match the address
- * families in the addr=/mountaddr= options.
- */
- if (protofamily != AF_UNSPEC &&
- protofamily != mnt->nfs_server.address.ss_family)
- goto out_proto_mismatch;
-
- if (mountfamily != AF_UNSPEC) {
- if (mnt->mount_server.addrlen) {
- if (mountfamily != mnt->mount_server.address.ss_family)
- goto out_mountproto_mismatch;
- } else {
- if (mountfamily != mnt->nfs_server.address.ss_family)
- goto out_mountproto_mismatch;
- }
- }
-
- return 1;
-
-out_mountproto_mismatch:
- printk(KERN_INFO "NFS: mount server address does not match mountproto= "
- "option\n");
- return 0;
-out_proto_mismatch:
- printk(KERN_INFO "NFS: server address does not match proto= option\n");
- return 0;
-out_invalid_address:
- printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
- return 0;
-out_invalid_value:
- printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
- return 0;
-out_minorversion_mismatch:
- printk(KERN_INFO "NFS: mount option vers=%u does not support "
- "minorversion=%u\n", mnt->version, mnt->minorversion);
- return 0;
-out_migration_misuse:
- printk(KERN_INFO
- "NFS: 'migration' not supported for this NFS version\n");
- return 0;
-out_nomem:
- printk(KERN_INFO "NFS: not enough memory to parse option\n");
- return 0;
-out_security_failure:
- free_secdata(secdata);
- printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
- return 0;
-}
-
-/*
* Ensure that a specified authtype in args->auth_info is supported by
* the server. Returns 0 and sets args->selected_flavor if it's ok, and
* -EACCES if not.
*/
-static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
+static int nfs_verify_authflavors(struct nfs_mount_context *args,
rpc_authflavor_t *server_authlist, unsigned int count)
{
rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
@@ -1731,7 +726,7 @@ static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
* Use the remote server's MOUNT service to request the NFS file handle
* corresponding to the provided path.
*/
-static int nfs_request_mount(struct nfs_parsed_mount_data *args,
+static int nfs_request_mount(struct nfs_mount_context *args,
struct nfs_fh *root_fh,
rpc_authflavor_t *server_authlist,
unsigned int *server_authlist_len)
@@ -1745,7 +740,7 @@ static int nfs_request_mount(struct nfs_parsed_mount_data *args,
.noresvport = args->flags & NFS_MOUNT_NORESVPORT,
.auth_flav_len = server_authlist_len,
.auth_flavs = server_authlist,
- .net = args->net,
+ .net = args->mc.net_ns,
};
int status;

@@ -1768,7 +763,7 @@ static int nfs_request_mount(struct nfs_parsed_mount_data *args,
/*
* Construct the mount server's address.
*/
- if (args->mount_server.address.ss_family == AF_UNSPEC) {
+ if (args->mount_server.address.sa_family == AF_UNSPEC) {
memcpy(request.sap, &args->nfs_server.address,
args->nfs_server.addrlen);
args->mount_server.addrlen = args->nfs_server.addrlen;
@@ -1790,20 +785,17 @@ static int nfs_request_mount(struct nfs_parsed_mount_data *args,
return 0;
}

-static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+static struct nfs_server *nfs_try_mount_request(struct nfs_mount_context *ctx)
{
int status;
unsigned int i;
bool tried_auth_unix = false;
bool auth_null_in_list = false;
struct nfs_server *server = ERR_PTR(-EACCES);
- struct nfs_parsed_mount_data *args = mount_info->parsed;
rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
unsigned int authlist_len = ARRAY_SIZE(authlist);

- status = nfs_request_mount(args, mount_info->mntfh, authlist,
- &authlist_len);
+ status = nfs_request_mount(ctx, ctx->mntfh, authlist, &authlist_len);
if (status)
return ERR_PTR(status);

@@ -1811,13 +803,13 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf
* Was a sec= authflavor specified in the options? First, verify
* whether the server supports it, and then just try to use it if so.
*/
- if (args->auth_info.flavor_len > 0) {
- status = nfs_verify_authflavors(args, authlist, authlist_len);
+ if (ctx->auth_info.flavor_len > 0) {
+ status = nfs_verify_authflavors(ctx, authlist, authlist_len);
dfprintk(MOUNT, "NFS: using auth flavor %u\n",
- args->selected_flavor);
+ ctx->selected_flavor);
if (status)
return ERR_PTR(status);
- return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ return ctx->nfs_mod->rpc_ops->create_server(ctx);
}

/*
@@ -1843,8 +835,8 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf
/* Fallthrough */
}
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
- args->selected_flavor = flavor;
- server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ ctx->selected_flavor = flavor;
+ server = ctx->nfs_mod->rpc_ops->create_server(ctx);
if (!IS_ERR(server))
return server;
}
@@ -1859,338 +851,30 @@ static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_inf

/* Last chance! Try AUTH_UNIX */
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
- args->selected_flavor = RPC_AUTH_UNIX;
- return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ ctx->selected_flavor = RPC_AUTH_UNIX;
+ return ctx->nfs_mod->rpc_ops->create_server(ctx);
}

-struct dentry *nfs_try_mount(int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+struct dentry *nfs_try_mount(struct nfs_mount_context *ctx)
{
struct nfs_server *server;

- if (mount_info->parsed->need_mount)
- server = nfs_try_mount_request(mount_info, nfs_mod);
+ pr_notice("*** nfs_try_mount\n");
+
+ if (ctx->need_mount)
+ server = nfs_try_mount_request(ctx);
else
- server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
+ server = ctx->nfs_mod->rpc_ops->create_server(ctx);

- if (IS_ERR(server))
+ if (IS_ERR(server)) {
+ ctx->mc.error = "NFS: Couldn't create server";
return ERR_CAST(server);
-
- return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
-}
-EXPORT_SYMBOL_GPL(nfs_try_mount);
-
-/*
- * Split "dev_name" into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path. If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
-static int nfs_parse_devname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
-{
- size_t len;
- char *end;
-
- /* Is the host name protected with square brakcets? */
- if (*dev_name == '[') {
- end = strchr(++dev_name, ']');
- if (end == NULL || end[1] != ':')
- goto out_bad_devname;
-
- len = end - dev_name;
- end++;
- } else {
- char *comma;
-
- end = strchr(dev_name, ':');
- if (end == NULL)
- goto out_bad_devname;
- len = end - dev_name;
-
- /* kill possible hostname list: not supported */
- comma = strchr(dev_name, ',');
- if (comma != NULL && comma < end)
- *comma = 0;
}

- if (len > maxnamlen)
- goto out_hostname;
-
- /* N.B. caller will free nfs_server.hostname in all cases */
- *hostname = kstrndup(dev_name, len, GFP_KERNEL);
- if (*hostname == NULL)
- goto out_nomem;
- len = strlen(++end);
- if (len > maxpathlen)
- goto out_path;
- *export_path = kstrndup(end, len, GFP_KERNEL);
- if (!*export_path)
- goto out_nomem;
-
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
- return 0;
-
-out_bad_devname:
- dfprintk(MOUNT, "NFS: device name not in host:path format\n");
- return -EINVAL;
-
-out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
- return -ENOMEM;
-
-out_hostname:
- dfprintk(MOUNT, "NFS: server hostname too long\n");
- return -ENAMETOOLONG;
-
-out_path:
- dfprintk(MOUNT, "NFS: export pathname too long\n");
- return -ENAMETOOLONG;
+ return nfs_fs_mount_common(server, ctx);
}
+EXPORT_SYMBOL_GPL(nfs_try_mount);

-/*
- * Validate the NFS2/NFS3 mount data
- * - fills in the mount root filehandle
- *
- * For option strings, user space handles the following behaviors:
- *
- * + DNS: mapping server host name to IP address ("addr=" option)
- *
- * + failure mode: how to behave if a mount request can't be handled
- * immediately ("fg/bg" option)
- *
- * + retry: how often to retry a mount request ("retry=" option)
- *
- * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
- * mountproto=tcp after mountproto=udp, and so on
- */
-static int nfs23_validate_mount_data(void *options,
- struct nfs_parsed_mount_data *args,
- struct nfs_fh *mntfh,
- const char *dev_name)
-{
- struct nfs_mount_data *data = (struct nfs_mount_data *)options;
- struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
- int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
-
- if (data == NULL)
- goto out_no_data;
-
- args->version = NFS_DEFAULT_VERSION;
- switch (data->version) {
- case 1:
- data->namlen = 0;
- case 2:
- data->bsize = 0;
- case 3:
- if (data->flags & NFS_MOUNT_VER3)
- goto out_no_v3;
- data->root.size = NFS2_FHSIZE;
- memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
- /* Turn off security negotiation */
- extra_flags |= NFS_MOUNT_SECFLAVOUR;
- case 4:
- if (data->flags & NFS_MOUNT_SECFLAVOUR)
- goto out_no_sec;
- case 5:
- memset(data->context, 0, sizeof(data->context));
- case 6:
- if (data->flags & NFS_MOUNT_VER3) {
- if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
- goto out_invalid_fh;
- mntfh->size = data->root.size;
- args->version = 3;
- } else {
- mntfh->size = NFS2_FHSIZE;
- args->version = 2;
- }
-
-
- memcpy(mntfh->data, data->root.data, mntfh->size);
- if (mntfh->size < sizeof(mntfh->data))
- memset(mntfh->data + mntfh->size, 0,
- sizeof(mntfh->data) - mntfh->size);
-
- /*
- * Translate to nfs_parsed_mount_data, which nfs_fill_super
- * can deal with.
- */
- args->flags = data->flags & NFS_MOUNT_FLAGMASK;
- args->flags |= extra_flags;
- args->rsize = data->rsize;
- args->wsize = data->wsize;
- args->timeo = data->timeo;
- args->retrans = data->retrans;
- args->acregmin = data->acregmin;
- args->acregmax = data->acregmax;
- args->acdirmin = data->acdirmin;
- args->acdirmax = data->acdirmax;
- args->need_mount = false;
-
- memcpy(sap, &data->addr, sizeof(data->addr));
- args->nfs_server.addrlen = sizeof(data->addr);
- args->nfs_server.port = ntohs(data->addr.sin_port);
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
-
- if (!(data->flags & NFS_MOUNT_TCP))
- args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- /* N.B. caller will free nfs_server.hostname in all cases */
- args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
- args->namlen = data->namlen;
- args->bsize = data->bsize;
-
- if (data->flags & NFS_MOUNT_SECFLAVOUR)
- args->selected_flavor = data->pseudoflavor;
- else
- args->selected_flavor = RPC_AUTH_UNIX;
- if (!args->nfs_server.hostname)
- goto out_nomem;
-
- if (!(data->flags & NFS_MOUNT_NONLM))
- args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
- NFS_MOUNT_LOCAL_FCNTL);
- else
- args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
- NFS_MOUNT_LOCAL_FCNTL);
- /*
- * The legacy version 6 binary mount data from userspace has a
- * field used only to transport selinux information into the
- * the kernel. To continue to support that functionality we
- * have a touch of selinux knowledge here in the NFS code. The
- * userspace code converted context=blah to just blah so we are
- * converting back to the full string selinux understands.
- */
- if (data->context[0]){
-#ifdef CONFIG_SECURITY_SELINUX
- int rc;
- char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
- if (!opts_str)
- return -ENOMEM;
- strcpy(opts_str, "context=");
- data->context[NFS_MAX_CONTEXT_LEN] = '\0';
- strcat(opts_str, &data->context[0]);
- rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
- kfree(opts_str);
- if (rc)
- return rc;
-#else
- return -EINVAL;
-#endif
- }
-
- break;
- default:
- return NFS_TEXT_DATA;
- }
-
- return 0;
-
-out_no_data:
- dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
- return -EINVAL;
-
-out_no_v3:
- dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
- data->version);
- return -EINVAL;
-
-out_no_sec:
- dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
- return -EINVAL;
-
-out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
- return -ENOMEM;
-
-out_no_address:
- dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
- return -EINVAL;
-
-out_invalid_fh:
- dfprintk(MOUNT, "NFS: invalid root filehandle\n");
- return -EINVAL;
-}
-
-#if IS_ENABLED(CONFIG_NFS_V4)
-static int nfs_validate_mount_data(struct file_system_type *fs_type,
- void *options,
- struct nfs_parsed_mount_data *args,
- struct nfs_fh *mntfh,
- const char *dev_name)
-{
- if (fs_type == &nfs_fs_type)
- return nfs23_validate_mount_data(options, args, mntfh, dev_name);
- return nfs4_validate_mount_data(options, args, dev_name);
-}
-#else
-static int nfs_validate_mount_data(struct file_system_type *fs_type,
- void *options,
- struct nfs_parsed_mount_data *args,
- struct nfs_fh *mntfh,
- const char *dev_name)
-{
- return nfs23_validate_mount_data(options, args, mntfh, dev_name);
-}
-#endif
-
-static int nfs_validate_text_mount_data(void *options,
- struct nfs_parsed_mount_data *args,
- const char *dev_name)
-{
- int port = 0;
- int max_namelen = PAGE_SIZE;
- int max_pathlen = NFS_MAXPATHLEN;
- struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
-
- if (nfs_parse_mount_options((char *)options, args) == 0)
- return -EINVAL;
-
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
-
- if (args->version == 4) {
-#if IS_ENABLED(CONFIG_NFS_V4)
- port = NFS_PORT;
- max_namelen = NFS4_MAXNAMLEN;
- max_pathlen = NFS4_MAXPATHLEN;
- nfs_validate_transport_protocol(args);
- if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
- nfs4_validate_mount_flags(args);
-#else
- goto out_v4_not_compiled;
-#endif /* CONFIG_NFS_V4 */
- } else
- nfs_set_mount_transport_protocol(args);
-
- nfs_set_port(sap, &args->nfs_server.port, port);
-
- return nfs_parse_devname(dev_name,
- &args->nfs_server.hostname,
- max_namelen,
- &args->nfs_server.export_path,
- max_pathlen);
-
-#if !IS_ENABLED(CONFIG_NFS_V4)
-out_v4_not_compiled:
- dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
- return -EPROTONOSUPPORT;
-#else
-out_invalid_transport_udp:
- dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
- return -EINVAL;
-#endif /* !CONFIG_NFS_V4 */
-
-out_no_address:
- dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
- return -EINVAL;
-}

#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
| NFS_MOUNT_SECURE \
@@ -2207,7 +891,7 @@ static int nfs_validate_text_mount_data(void *options,

static int
nfs_compare_remount_data(struct nfs_server *nfss,
- struct nfs_parsed_mount_data *data)
+ struct nfs_mount_context *data)
{
if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
data->rsize != nfss->rsize ||
@@ -2230,15 +914,11 @@ nfs_compare_remount_data(struct nfs_server *nfss,
return 0;
}

-int
-nfs_remount(struct super_block *sb, int *flags, char *raw_data)
+int nfs_remount(struct super_block *sb, struct mount_context *mc)
{
- int error;
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
struct nfs_server *nfss = sb->s_fs_info;
- struct nfs_parsed_mount_data *data;
- struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
- struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
- u32 nfsvers = nfss->nfs_client->rpc_ops->version;

sync_filesystem(sb);

@@ -2248,60 +928,27 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
* ones were explicitly specified. Fall back to legacy behavior and
* just return success.
*/
- if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
- (nfsvers <= 3 && (!options || (options->version >= 1 &&
- options->version <= 6))))
+ if (ctx->skip_remount_option_check)
return 0;

- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- /* fill out struct with values from existing mount */
- data->flags = nfss->flags;
- data->rsize = nfss->rsize;
- data->wsize = nfss->wsize;
- data->retrans = nfss->client->cl_timeout->to_retries;
- data->selected_flavor = nfss->client->cl_auth->au_flavor;
- data->acregmin = nfss->acregmin / HZ;
- data->acregmax = nfss->acregmax / HZ;
- data->acdirmin = nfss->acdirmin / HZ;
- data->acdirmax = nfss->acdirmax / HZ;
- data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
- data->nfs_server.port = nfss->port;
- data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
- data->version = nfsvers;
- data->minorversion = nfss->nfs_client->cl_minorversion;
- data->net = current->nsproxy->net_ns;
- memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
- data->nfs_server.addrlen);
-
- /* overwrite those values with any that were specified */
- error = -EINVAL;
- if (!nfs_parse_mount_options((char *)options, data))
- goto out;
-
/*
* noac is a special case. It implies -o sync, but that's not
* necessarily reflected in the mtab options. do_remount_sb
* will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
* remount options, so we have to explicitly reset it.
*/
- if (data->flags & NFS_MOUNT_NOAC)
- *flags |= MS_SYNCHRONOUS;
+ if (ctx->flags & NFS_MOUNT_NOAC)
+ ctx->mc.ms_flags |= MS_SYNCHRONOUS;

/* compare new mount options with old ones */
- error = nfs_compare_remount_data(nfss, data);
-out:
- kfree(data);
- return error;
+ return nfs_compare_remount_data(nfss, ctx);
}
EXPORT_SYMBOL_GPL(nfs_remount);

/*
* Initialise the common bits of the superblock
*/
-inline void nfs_initialise_sb(struct super_block *sb)
+static inline void nfs_initialise_sb(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);

@@ -2319,69 +966,75 @@ inline void nfs_initialise_sb(struct super_block *sb)
}

/*
- * Finish setting up an NFS2/3 superblock
+ * Finish setting up a cloned NFS2/3/4 superblock
*/
-int nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
+static int nfs_clone_super(struct super_block *sb, struct mount_context *mc)
{
- struct nfs_parsed_mount_data *data = mount_info->parsed;
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
+ const struct super_block *old_sb = ctx->clone_data.sb;
struct nfs_server *server = NFS_SB(sb);
- int ret;

- sb->s_blocksize_bits = 0;
- sb->s_blocksize = 0;
- sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
- sb->s_op = server->nfs_client->cl_nfs_mod->sops;
- if (data && data->bsize)
- sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
+ sb->s_blocksize_bits = old_sb->s_blocksize_bits;
+ sb->s_blocksize = old_sb->s_blocksize;
+ sb->s_maxbytes = old_sb->s_maxbytes;
+ sb->s_xattr = old_sb->s_xattr;
+ sb->s_op = old_sb->s_op;
+ sb->s_time_gran = 1;

if (server->nfs_client->rpc_ops->version != 2) {
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
sb->s_flags |= MS_POSIXACL;
- sb->s_time_gran = 1;
}

nfs_initialise_sb(sb);

- ret = super_setup_bdi_name(sb, "%u:%u", MAJOR(server->s_dev),
- MINOR(server->s_dev));
- if (ret)
- return ret;
- sb->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
- return 0;
+ sb->s_bdi = bdi_get(old_sb->s_bdi);

+ return 0;
}
-EXPORT_SYMBOL_GPL(nfs_fill_super);

/*
- * Finish setting up a cloned NFS2/3/4 superblock
+ * Finish setting up an NFS2/3 superblock
*/
-int nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
+int nfs_fill_super(struct super_block *sb, struct mount_context *mc)
{
- const struct super_block *old_sb = mount_info->cloned->sb;
+ struct nfs_mount_context *ctx =
+ container_of(mc, struct nfs_mount_context, mc);
struct nfs_server *server = NFS_SB(sb);
+ int ret;

- sb->s_blocksize_bits = old_sb->s_blocksize_bits;
- sb->s_blocksize = old_sb->s_blocksize;
- sb->s_maxbytes = old_sb->s_maxbytes;
- sb->s_xattr = old_sb->s_xattr;
- sb->s_op = old_sb->s_op;
- sb->s_time_gran = 1;
+ if (ctx->clone_data.sb)
+ return nfs_clone_super(sb, mc);
+
+ sb->s_blocksize_bits = 0;
+ sb->s_blocksize = 0;
+ sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
+ sb->s_op = server->nfs_client->cl_nfs_mod->sops;
+ if (ctx->bsize)
+ sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);

if (server->nfs_client->rpc_ops->version != 2) {
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
sb->s_flags |= MS_POSIXACL;
+ sb->s_time_gran = 1;
}

nfs_initialise_sb(sb);

- sb->s_bdi = bdi_get(old_sb->s_bdi);
-
+ ret = super_setup_bdi_name(sb, "%u:%u", MAJOR(server->s_dev),
+ MINOR(server->s_dev));
+ if (ret)
+ return ret;
+ sb->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
return 0;
+
}
+EXPORT_SYMBOL_GPL(nfs_fill_super);

static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
{
@@ -2495,8 +1148,7 @@ static int nfs_compare_super(struct super_block *sb, void *data)

#ifdef CONFIG_NFS_FSCACHE
static void nfs_get_cache_cookie(struct super_block *sb,
- struct nfs_parsed_mount_data *parsed,
- struct nfs_clone_mount *cloned)
+ struct nfs_mount_context *ctx)
{
struct nfs_server *nfss = NFS_SB(sb);
char *uniq = NULL;
@@ -2505,21 +1157,21 @@ static void nfs_get_cache_cookie(struct super_block *sb,
nfss->fscache_key = NULL;
nfss->fscache = NULL;

- if (parsed) {
- if (!(parsed->options & NFS_OPTION_FSCACHE))
+ if (ctx) {
+ if (!(ctx->options & NFS_OPTION_FSCACHE))
return;
- if (parsed->fscache_uniq) {
- uniq = parsed->fscache_uniq;
- ulen = strlen(parsed->fscache_uniq);
+ if (ctx->fscache_uniq) {
+ uniq = ctx->fscache_uniq;
+ ulen = strlen(ctx->fscache_uniq);
}
- } else if (cloned) {
- struct nfs_server *mnt_s = NFS_SB(cloned->sb);
+ } else if (ctx->clone_data.cloned) {
+ struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
if (!(mnt_s->options & NFS_OPTION_FSCACHE))
return;
if (mnt_s->fscache_key) {
uniq = mnt_s->fscache_key->key.uniquifier;
ulen = mnt_s->fscache_key->key.uniq_len;
- };
+ }
} else
return;

@@ -2527,22 +1179,22 @@ static void nfs_get_cache_cookie(struct super_block *sb,
}
#else
static void nfs_get_cache_cookie(struct super_block *sb,
- struct nfs_parsed_mount_data *parsed,
- struct nfs_clone_mount *cloned)
+ struct nfs_mount_context *ctx)
{
}
#endif

int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
- struct nfs_mount_info *mount_info)
+ struct nfs_mount_context *ctx)
{
int error;
unsigned long kflags = 0, kflags_out = 0;
+
if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
kflags |= SECURITY_LSM_NATIVE_LABELS;

- error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
- kflags, &kflags_out);
+ error = security_sb_set_mnt_opts(s, ctx->mc.security,
+ kflags, &kflags_out);
if (error)
goto err;

@@ -2555,25 +1207,23 @@ int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
EXPORT_SYMBOL_GPL(nfs_set_sb_security);

int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
- struct nfs_mount_info *mount_info)
+ struct nfs_mount_context *ctx)
{
/* clone any lsm security options from the parent to the new sb */
if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
return -ESTALE;
- return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
+ return security_sb_clone_mnt_opts(ctx->clone_data.sb, s);
}
EXPORT_SYMBOL_GPL(nfs_clone_sb_security);

struct dentry *nfs_fs_mount_common(struct nfs_server *server,
- int flags, const char *dev_name,
- struct nfs_mount_info *mount_info,
- struct nfs_subversion *nfs_mod)
+ struct nfs_mount_context *ctx)
{
struct super_block *s;
struct dentry *mntroot = ERR_PTR(-ENOMEM);
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
+ .mntflags = ctx->mc.ms_flags,
.server = server,
};
int error;
@@ -2585,14 +1235,16 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
if (server->flags & NFS_MOUNT_NOAC)
sb_mntdata.mntflags |= MS_SYNCHRONOUS;

- if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
- if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
+ if (ctx->clone_data.cloned && ctx->clone_data.sb != NULL)
+ if (ctx->clone_data.sb->s_flags & MS_SYNCHRONOUS)
sb_mntdata.mntflags |= MS_SYNCHRONOUS;

/* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
+ s = sget(ctx->nfs_mod->nfs_fs, compare_super, nfs_set_super, ctx->mc.ms_flags,
+ &sb_mntdata);
if (IS_ERR(s)) {
mntroot = ERR_CAST(s);
+ ctx->mc.error = "NFS: Couldn't get superblock";
goto out_err_nosb;
}

@@ -2605,17 +1257,17 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,

if (!s->s_root) {
/* initial superblock/root creation */
- error = mount_info->fill_super(s, mount_info);
- if (error)
- goto error_splat_super;
- nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
+ ctx->mc.ops->fill_super(s, &ctx->mc);
+ nfs_get_cache_cookie(s, ctx);
}

- mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
- if (IS_ERR(mntroot))
+ mntroot = nfs_get_root(s, ctx->mntfh, ctx->mc.device);
+ if (IS_ERR(mntroot)) {
+ ctx->mc.error = "NFS: Couldn't get root dentry";
goto error_splat_super;
+ }

- error = mount_info->set_security(s, mntroot, mount_info);
+ error = ctx->set_security(s, mntroot, ctx);
if (error)
goto error_splat_root;

@@ -2637,47 +1289,6 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
}
EXPORT_SYMBOL_GPL(nfs_fs_mount_common);

-struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *raw_data)
-{
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_fill_super,
- .set_security = nfs_set_sb_security,
- };
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- struct nfs_subversion *nfs_mod;
- int error;
-
- mount_info.parsed = nfs_alloc_parsed_mount_data();
- mount_info.mntfh = nfs_alloc_fhandle();
- if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
- goto out;
-
- /* Validate the mount data */
- error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
- if (error == NFS_TEXT_DATA)
- error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
- if (error < 0) {
- mntroot = ERR_PTR(error);
- goto out;
- }
-
- nfs_mod = get_nfs_version(mount_info.parsed->version);
- if (IS_ERR(nfs_mod)) {
- mntroot = ERR_CAST(nfs_mod);
- goto out;
- }
-
- mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
-
- put_nfs_version(nfs_mod);
-out:
- nfs_free_parsed_mount_data(mount_info.parsed);
- nfs_free_fhandle(mount_info.mntfh);
- return mntroot;
-}
-EXPORT_SYMBOL_GPL(nfs_fs_mount);
-
/*
* Destroy an NFS2/3 superblock
*/
@@ -2695,150 +1306,8 @@ void nfs_kill_super(struct super_block *s)
}
EXPORT_SYMBOL_GPL(nfs_kill_super);

-/*
- * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
- */
-static struct dentry *
-nfs_xdev_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
-{
- struct nfs_clone_mount *data = raw_data;
- struct nfs_mount_info mount_info = {
- .fill_super = nfs_clone_super,
- .set_security = nfs_clone_sb_security,
- .cloned = data,
- };
- struct nfs_server *server;
- struct dentry *mntroot = ERR_PTR(-ENOMEM);
- struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
-
- dprintk("--> nfs_xdev_mount()\n");
-
- mount_info.mntfh = mount_info.cloned->fh;
-
- /* create a new volume representation */
- server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-
- if (IS_ERR(server))
- mntroot = ERR_CAST(server);
- else
- mntroot = nfs_fs_mount_common(server, flags,
- dev_name, &mount_info, nfs_mod);
-
- dprintk("<-- nfs_xdev_mount() = %ld\n",
- IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
- return mntroot;
-}
-
#if IS_ENABLED(CONFIG_NFS_V4)

-static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
-{
- args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
- NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
-}
-
-/*
- * Validate NFSv4 mount options
- */
-static int nfs4_validate_mount_data(void *options,
- struct nfs_parsed_mount_data *args,
- const char *dev_name)
-{
- struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
- struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
- char *c;
-
- if (data == NULL)
- goto out_no_data;
-
- args->version = 4;
-
- switch (data->version) {
- case 1:
- if (data->host_addrlen > sizeof(args->nfs_server.address))
- goto out_no_address;
- if (data->host_addrlen == 0)
- goto out_no_address;
- args->nfs_server.addrlen = data->host_addrlen;
- if (copy_from_user(sap, data->host_addr, data->host_addrlen))
- return -EFAULT;
- if (!nfs_verify_server_address(sap))
- goto out_no_address;
- args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
-
- if (data->auth_flavourlen) {
- rpc_authflavor_t pseudoflavor;
- if (data->auth_flavourlen > 1)
- goto out_inval_auth;
- if (copy_from_user(&pseudoflavor,
- data->auth_flavours,
- sizeof(pseudoflavor)))
- return -EFAULT;
- args->selected_flavor = pseudoflavor;
- } else
- args->selected_flavor = RPC_AUTH_UNIX;
-
- c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->nfs_server.hostname = c;
-
- c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->nfs_server.export_path = c;
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
-
- c = strndup_user(data->client_addr.data, 16);
- if (IS_ERR(c))
- return PTR_ERR(c);
- args->client_address = c;
-
- /*
- * Translate to nfs_parsed_mount_data, which nfs4_fill_super
- * can deal with.
- */
-
- args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
- args->rsize = data->rsize;
- args->wsize = data->wsize;
- args->timeo = data->timeo;
- args->retrans = data->retrans;
- args->acregmin = data->acregmin;
- args->acregmax = data->acregmax;
- args->acdirmin = data->acdirmin;
- args->acdirmax = data->acdirmax;
- args->nfs_server.protocol = data->proto;
- nfs_validate_transport_protocol(args);
- if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
- goto out_invalid_transport_udp;
-
- break;
- default:
- return NFS_TEXT_DATA;
- }
-
- return 0;
-
-out_no_data:
- dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
- return -EINVAL;
-
-out_inval_auth:
- dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
- data->auth_flavourlen);
- return -EINVAL;
-
-out_no_address:
- dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
- return -EINVAL;
-
-out_invalid_transport_udp:
- dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
- return -EINVAL;
-}
-
/*
* NFS v4 module parameters need to stay in the
* NFS client for backwards compatibility
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 348f7c158084..ca0e3793cb50 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1540,6 +1540,7 @@ struct nfs_subversion;
struct nfs_mount_info;
struct nfs_client_initdata;
struct nfs_pageio_descriptor;
+struct nfs_mount_context;

/*
* RPC procedure vector for NFSv2/NFSv3 demuxing
@@ -1553,10 +1554,10 @@ struct nfs_rpc_ops {

int (*getroot) (struct nfs_server *, struct nfs_fh *,
struct nfs_fsinfo *);
+ struct dentry *(*mount)(struct nfs_mount_context *);
struct vfsmount *(*submount) (struct nfs_server *, struct dentry *,
struct nfs_fh *, struct nfs_fattr *);
- struct dentry *(*try_mount) (int, const char *, struct nfs_mount_info *,
- struct nfs_subversion *);
+ struct dentry *(*try_mount) (struct nfs_mount_context *);
int (*getattr) (struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, struct nfs4_label *);
int (*setattr) (struct dentry *, struct nfs_fattr *,
@@ -1617,7 +1618,7 @@ struct nfs_rpc_ops {
struct nfs_client *(*init_client) (struct nfs_client *,
const struct nfs_client_initdata *);
void (*free_client) (struct nfs_client *);
- struct nfs_server *(*create_server)(struct nfs_mount_info *, struct nfs_subversion *);
+ struct nfs_server *(*create_server)(struct nfs_mount_context *);
struct nfs_server *(*clone_server)(struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);
};

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