2900 lines
74 KiB
C
2900 lines
74 KiB
C
/*
|
|
* linux/fs/nfs/super.c
|
|
*
|
|
* Copyright (C) 1992 Rick Sladkey
|
|
*
|
|
* nfs superblock handling functions
|
|
*
|
|
* Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
|
|
* experimental NFS changes. Modularisation taken straight from SYS5 fs.
|
|
*
|
|
* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
|
|
* J.S.Peatfield@damtp.cam.ac.uk
|
|
*
|
|
* Split from inode.c by David Howells <dhowells@redhat.com>
|
|
*
|
|
* - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
|
|
* particular server are held in the same superblock
|
|
* - NFS superblocks can have several effective roots to the dentry tree
|
|
* - directory type roots are spliced into the tree when a path from one root reaches the root
|
|
* of another (see nfs_lookup())
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/sunrpc/addr.h>
|
|
#include <linux/sunrpc/stats.h>
|
|
#include <linux/sunrpc/metrics.h>
|
|
#include <linux/sunrpc/xprtsock.h>
|
|
#include <linux/sunrpc/xprtrdma.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/nfs_mount.h>
|
|
#include <linux/nfs4_mount.h>
|
|
#include <linux/lockd/bind.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/nfs_idmap.h>
|
|
#include <linux/vfs.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/slab.h>
|
|
#include <net/ipv6.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/nfs_xdr.h>
|
|
#include <linux/magic.h>
|
|
#include <linux/parser.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "nfs4_fs.h"
|
|
#include "callback.h"
|
|
#include "delegation.h"
|
|
#include "iostat.h"
|
|
#include "internal.h"
|
|
#include "fscache.h"
|
|
#include "nfs4session.h"
|
|
#include "pnfs.h"
|
|
#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_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_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,
|
|
.destroy_inode = nfs_destroy_inode,
|
|
.write_inode = nfs_write_inode,
|
|
.drop_inode = nfs_drop_inode,
|
|
.put_super = nfs_put_super,
|
|
.statfs = nfs_statfs,
|
|
.evict_inode = nfs_evict_inode,
|
|
.umount_begin = nfs_umount_begin,
|
|
.show_options = nfs_show_options,
|
|
.show_devname = nfs_show_devname,
|
|
.show_path = nfs_show_path,
|
|
.show_stats = nfs_show_stats,
|
|
.remount_fs = 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);
|
|
}
|
|
|
|
static void unregister_nfs4_fs(void)
|
|
{
|
|
unregister_filesystem(&nfs4_fs_type);
|
|
}
|
|
#else
|
|
static int __init register_nfs4_fs(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void unregister_nfs4_fs(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static struct shrinker acl_shrinker = {
|
|
.count_objects = nfs_access_cache_count,
|
|
.scan_objects = nfs_access_cache_scan,
|
|
.seeks = DEFAULT_SEEKS,
|
|
};
|
|
|
|
/*
|
|
* Register the NFS filesystems
|
|
*/
|
|
int __init register_nfs_fs(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_filesystem(&nfs_fs_type);
|
|
if (ret < 0)
|
|
goto error_0;
|
|
|
|
ret = register_nfs4_fs();
|
|
if (ret < 0)
|
|
goto error_1;
|
|
|
|
ret = nfs_register_sysctl();
|
|
if (ret < 0)
|
|
goto error_2;
|
|
register_shrinker(&acl_shrinker);
|
|
return 0;
|
|
|
|
error_2:
|
|
unregister_nfs4_fs();
|
|
error_1:
|
|
unregister_filesystem(&nfs_fs_type);
|
|
error_0:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Unregister the NFS filesystems
|
|
*/
|
|
void __exit unregister_nfs_fs(void)
|
|
{
|
|
unregister_shrinker(&acl_shrinker);
|
|
nfs_unregister_sysctl();
|
|
unregister_nfs4_fs();
|
|
unregister_filesystem(&nfs_fs_type);
|
|
}
|
|
|
|
void nfs_sb_active(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
if (atomic_inc_return(&server->active) == 1)
|
|
atomic_inc(&sb->s_active);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_sb_active);
|
|
|
|
void nfs_sb_deactive(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
if (atomic_dec_and_test(&server->active))
|
|
deactivate_super(sb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_sb_deactive);
|
|
|
|
/*
|
|
* Deliver file system statistics to userspace
|
|
*/
|
|
int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct nfs_server *server = NFS_SB(dentry->d_sb);
|
|
unsigned char blockbits;
|
|
unsigned long blockres;
|
|
struct nfs_fh *fh = NFS_FH(dentry->d_inode);
|
|
struct nfs_fsstat res;
|
|
int error = -ENOMEM;
|
|
|
|
res.fattr = nfs_alloc_fattr();
|
|
if (res.fattr == NULL)
|
|
goto out_err;
|
|
|
|
error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
|
|
if (unlikely(error == -ESTALE)) {
|
|
struct dentry *pd_dentry;
|
|
|
|
pd_dentry = dget_parent(dentry);
|
|
if (pd_dentry != NULL) {
|
|
nfs_zap_caches(pd_dentry->d_inode);
|
|
dput(pd_dentry);
|
|
}
|
|
}
|
|
nfs_free_fattr(res.fattr);
|
|
if (error < 0)
|
|
goto out_err;
|
|
|
|
buf->f_type = NFS_SUPER_MAGIC;
|
|
|
|
/*
|
|
* Current versions of glibc do not correctly handle the
|
|
* case where f_frsize != f_bsize. Eventually we want to
|
|
* report the value of wtmult in this field.
|
|
*/
|
|
buf->f_frsize = dentry->d_sb->s_blocksize;
|
|
|
|
/*
|
|
* On most *nix systems, f_blocks, f_bfree, and f_bavail
|
|
* are reported in units of f_frsize. Linux hasn't had
|
|
* an f_frsize field in its statfs struct until recently,
|
|
* thus historically Linux's sys_statfs reports these
|
|
* fields in units of f_bsize.
|
|
*/
|
|
buf->f_bsize = dentry->d_sb->s_blocksize;
|
|
blockbits = dentry->d_sb->s_blocksize_bits;
|
|
blockres = (1 << blockbits) - 1;
|
|
buf->f_blocks = (res.tbytes + blockres) >> blockbits;
|
|
buf->f_bfree = (res.fbytes + blockres) >> blockbits;
|
|
buf->f_bavail = (res.abytes + blockres) >> blockbits;
|
|
|
|
buf->f_files = res.tfiles;
|
|
buf->f_ffree = res.afiles;
|
|
|
|
buf->f_namelen = server->namelen;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
dprintk("%s: statfs error = %d\n", __func__, -error);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_statfs);
|
|
|
|
/*
|
|
* Map the security flavour number to a name
|
|
*/
|
|
static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
|
|
{
|
|
static const struct {
|
|
rpc_authflavor_t flavour;
|
|
const char *str;
|
|
} sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
|
|
/* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
|
|
{ RPC_AUTH_NULL, "null" },
|
|
{ RPC_AUTH_UNIX, "sys" },
|
|
{ RPC_AUTH_GSS_KRB5, "krb5" },
|
|
{ RPC_AUTH_GSS_KRB5I, "krb5i" },
|
|
{ RPC_AUTH_GSS_KRB5P, "krb5p" },
|
|
{ RPC_AUTH_GSS_LKEY, "lkey" },
|
|
{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
|
|
{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
|
|
{ RPC_AUTH_GSS_SPKM, "spkm" },
|
|
{ RPC_AUTH_GSS_SPKMI, "spkmi" },
|
|
{ RPC_AUTH_GSS_SPKMP, "spkmp" },
|
|
{ UINT_MAX, "unknown" }
|
|
};
|
|
int i;
|
|
|
|
for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
|
|
if (sec_flavours[i].flavour == flavour)
|
|
break;
|
|
}
|
|
return sec_flavours[i].str;
|
|
}
|
|
|
|
static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
|
|
|
|
seq_printf(m, ",mountproto=");
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
switch (nfss->mountd_protocol) {
|
|
case IPPROTO_UDP:
|
|
seq_printf(m, RPCBIND_NETID_UDP);
|
|
break;
|
|
case IPPROTO_TCP:
|
|
seq_printf(m, RPCBIND_NETID_TCP);
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
break;
|
|
case AF_INET6:
|
|
switch (nfss->mountd_protocol) {
|
|
case IPPROTO_UDP:
|
|
seq_printf(m, RPCBIND_NETID_UDP6);
|
|
break;
|
|
case IPPROTO_TCP:
|
|
seq_printf(m, RPCBIND_NETID_TCP6);
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
}
|
|
|
|
static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
|
|
|
|
if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
|
|
return;
|
|
|
|
switch (sap->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)sap;
|
|
seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
|
|
seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
|
|
break;
|
|
}
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, ",mountaddr=unspecified");
|
|
}
|
|
|
|
if (nfss->mountd_version || showdefaults)
|
|
seq_printf(m, ",mountvers=%u", nfss->mountd_version);
|
|
if ((nfss->mountd_port &&
|
|
nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
|
|
showdefaults)
|
|
seq_printf(m, ",mountport=%u", nfss->mountd_port);
|
|
|
|
nfs_show_mountd_netid(m, nfss, showdefaults);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct nfs_client *clp = nfss->nfs_client;
|
|
|
|
seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
|
|
}
|
|
#else
|
|
static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void nfs_show_nfs_version(struct seq_file *m,
|
|
unsigned int version,
|
|
unsigned int minorversion)
|
|
{
|
|
seq_printf(m, ",vers=%u", version);
|
|
if (version == 4)
|
|
seq_printf(m, ".%u", minorversion);
|
|
}
|
|
|
|
/*
|
|
* Describe the mount options in force on this server representation
|
|
*/
|
|
static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
static const struct proc_nfs_info {
|
|
int flag;
|
|
const char *str;
|
|
const char *nostr;
|
|
} nfs_info[] = {
|
|
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
|
|
{ NFS_MOUNT_POSIX, ",posix", "" },
|
|
{ NFS_MOUNT_NOCTO, ",nocto", "" },
|
|
{ NFS_MOUNT_NOAC, ",noac", "" },
|
|
{ NFS_MOUNT_NONLM, ",nolock", "" },
|
|
{ NFS_MOUNT_NOACL, ",noacl", "" },
|
|
{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
|
|
{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
|
|
{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
|
|
{ 0, NULL, NULL }
|
|
};
|
|
const struct proc_nfs_info *nfs_infop;
|
|
struct nfs_client *clp = nfss->nfs_client;
|
|
u32 version = clp->rpc_ops->version;
|
|
int local_flock, local_fcntl;
|
|
|
|
nfs_show_nfs_version(m, version, clp->cl_minorversion);
|
|
seq_printf(m, ",rsize=%u", nfss->rsize);
|
|
seq_printf(m, ",wsize=%u", nfss->wsize);
|
|
if (nfss->bsize != 0)
|
|
seq_printf(m, ",bsize=%u", nfss->bsize);
|
|
seq_printf(m, ",namlen=%u", nfss->namelen);
|
|
if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
|
|
seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
|
|
if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
|
|
seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
|
|
if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
|
|
if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
|
|
for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
|
|
if (nfss->flags & nfs_infop->flag)
|
|
seq_puts(m, nfs_infop->str);
|
|
else
|
|
seq_puts(m, nfs_infop->nostr);
|
|
}
|
|
rcu_read_lock();
|
|
seq_printf(m, ",proto=%s",
|
|
rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
|
|
rcu_read_unlock();
|
|
if (version == 4) {
|
|
if (nfss->port != NFS_PORT)
|
|
seq_printf(m, ",port=%u", nfss->port);
|
|
} else
|
|
if (nfss->port)
|
|
seq_printf(m, ",port=%u", nfss->port);
|
|
|
|
seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
|
|
seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
|
|
seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
|
|
|
|
if (version != 4)
|
|
nfs_show_mountd_options(m, nfss, showdefaults);
|
|
else
|
|
nfs_show_nfsv4_options(m, nfss, showdefaults);
|
|
|
|
if (nfss->options & NFS_OPTION_FSCACHE)
|
|
seq_printf(m, ",fsc");
|
|
|
|
if (nfss->options & NFS_OPTION_MIGRATION)
|
|
seq_printf(m, ",migration");
|
|
|
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
|
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
|
|
seq_printf(m, ",lookupcache=none");
|
|
else
|
|
seq_printf(m, ",lookupcache=pos");
|
|
}
|
|
|
|
local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
|
|
local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
|
|
|
|
if (!local_flock && !local_fcntl)
|
|
seq_printf(m, ",local_lock=none");
|
|
else if (local_flock && local_fcntl)
|
|
seq_printf(m, ",local_lock=all");
|
|
else if (local_flock)
|
|
seq_printf(m, ",local_lock=flock");
|
|
else
|
|
seq_printf(m, ",local_lock=posix");
|
|
}
|
|
|
|
/*
|
|
* Describe the mount options on this VFS mountpoint
|
|
*/
|
|
int nfs_show_options(struct seq_file *m, struct dentry *root)
|
|
{
|
|
struct nfs_server *nfss = NFS_SB(root->d_sb);
|
|
|
|
nfs_show_mount_options(m, nfss, 0);
|
|
|
|
rcu_read_lock();
|
|
seq_printf(m, ",addr=%s",
|
|
rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
|
|
RPC_DISPLAY_ADDR));
|
|
rcu_read_unlock();
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_show_options);
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
#ifdef CONFIG_NFS_V4_1
|
|
static void show_sessions(struct seq_file *m, struct nfs_server *server)
|
|
{
|
|
if (nfs4_has_session(server->nfs_client))
|
|
seq_printf(m, ",sessions");
|
|
}
|
|
#else
|
|
static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_NFS_V4_1
|
|
static void show_pnfs(struct seq_file *m, struct nfs_server *server)
|
|
{
|
|
seq_printf(m, ",pnfs=");
|
|
if (server->pnfs_curr_ld)
|
|
seq_printf(m, "%s", server->pnfs_curr_ld->name);
|
|
else
|
|
seq_printf(m, "not configured");
|
|
}
|
|
|
|
static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
|
|
{
|
|
if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
|
|
struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
|
|
seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
|
|
"date='%llu,%u'",
|
|
impl_id->name, impl_id->domain,
|
|
impl_id->date.seconds, impl_id->date.nseconds);
|
|
}
|
|
}
|
|
#else
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
static void show_pnfs(struct seq_file *m, struct nfs_server *server)
|
|
{
|
|
}
|
|
#endif
|
|
static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
int nfs_show_devname(struct seq_file *m, struct dentry *root)
|
|
{
|
|
char *page = (char *) __get_free_page(GFP_KERNEL);
|
|
char *devname, *dummy;
|
|
int err = 0;
|
|
if (!page)
|
|
return -ENOMEM;
|
|
devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
|
|
if (IS_ERR(devname))
|
|
err = PTR_ERR(devname);
|
|
else
|
|
seq_escape(m, devname, " \t\n\\");
|
|
free_page((unsigned long)page);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_show_devname);
|
|
|
|
int nfs_show_path(struct seq_file *m, struct dentry *dentry)
|
|
{
|
|
seq_puts(m, "/");
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_show_path);
|
|
|
|
/*
|
|
* Present statistical information for this VFS mountpoint
|
|
*/
|
|
int nfs_show_stats(struct seq_file *m, struct dentry *root)
|
|
{
|
|
int i, cpu;
|
|
struct nfs_server *nfss = NFS_SB(root->d_sb);
|
|
struct rpc_auth *auth = nfss->client->cl_auth;
|
|
struct nfs_iostats totals = { };
|
|
|
|
seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
|
|
|
|
/*
|
|
* Display all mount option settings
|
|
*/
|
|
seq_printf(m, "\n\topts:\t");
|
|
seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
|
|
seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
|
|
seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
|
|
seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
|
|
nfs_show_mount_options(m, nfss, 1);
|
|
|
|
seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
|
|
|
|
show_implementation_id(m, nfss);
|
|
|
|
seq_printf(m, "\n\tcaps:\t");
|
|
seq_printf(m, "caps=0x%x", nfss->caps);
|
|
seq_printf(m, ",wtmult=%u", nfss->wtmult);
|
|
seq_printf(m, ",dtsize=%u", nfss->dtsize);
|
|
seq_printf(m, ",bsize=%u", nfss->bsize);
|
|
seq_printf(m, ",namlen=%u", nfss->namelen);
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
if (nfss->nfs_client->rpc_ops->version == 4) {
|
|
seq_printf(m, "\n\tnfsv4:\t");
|
|
seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
|
|
seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
|
|
seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
|
|
seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
|
|
show_sessions(m, nfss);
|
|
show_pnfs(m, nfss);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Display security flavor in effect for this mount
|
|
*/
|
|
seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
|
|
if (auth->au_flavor)
|
|
seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
|
|
|
|
/*
|
|
* Display superblock I/O counters
|
|
*/
|
|
for_each_possible_cpu(cpu) {
|
|
struct nfs_iostats *stats;
|
|
|
|
preempt_disable();
|
|
stats = per_cpu_ptr(nfss->io_stats, cpu);
|
|
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
totals.events[i] += stats->events[i];
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
totals.bytes[i] += stats->bytes[i];
|
|
#ifdef CONFIG_NFS_FSCACHE
|
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
|
|
totals.fscache[i] += stats->fscache[i];
|
|
#endif
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
seq_printf(m, "\n\tevents:\t");
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
seq_printf(m, "%lu ", totals.events[i]);
|
|
seq_printf(m, "\n\tbytes:\t");
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
seq_printf(m, "%Lu ", totals.bytes[i]);
|
|
#ifdef CONFIG_NFS_FSCACHE
|
|
if (nfss->options & NFS_OPTION_FSCACHE) {
|
|
seq_printf(m, "\n\tfsc:\t");
|
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
|
|
seq_printf(m, "%Lu ", totals.bytes[i]);
|
|
}
|
|
#endif
|
|
seq_printf(m, "\n");
|
|
|
|
rpc_print_iostats(m, nfss->client);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_show_stats);
|
|
|
|
/*
|
|
* Begin unmount by attempting to remove all automounted mountpoints we added
|
|
* in response to xdev traversals and referrals
|
|
*/
|
|
void nfs_umount_begin(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server;
|
|
struct rpc_clnt *rpc;
|
|
|
|
server = NFS_SB(sb);
|
|
/* -EIO all pending I/O */
|
|
rpc = server->client_acl;
|
|
if (!IS_ERR(rpc))
|
|
rpc_killall_tasks(rpc);
|
|
rpc = server->client;
|
|
if (!IS_ERR(rpc))
|
|
rpc_killall_tasks(rpc);
|
|
}
|
|
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->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 = (sizeof(auth_info->flavors) /
|
|
sizeof(auth_info->flavors[0]));
|
|
|
|
/* 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.
|
|
*/
|
|
bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
|
|
rpc_authflavor_t match)
|
|
{
|
|
int i;
|
|
|
|
if (!auth_info->flavor_len)
|
|
return true;
|
|
|
|
for (i = 0; i < auth_info->flavor_len; i++) {
|
|
if (auth_info->flavors[i] == match)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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(args, &option) || option == 0)
|
|
goto out_invalid_value;
|
|
mnt->timeo = option;
|
|
break;
|
|
case Opt_retrans:
|
|
if (nfs_get_option_ul(args, &option) || option == 0)
|
|
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_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,
|
|
rpc_authflavor_t *server_authlist, unsigned int count)
|
|
{
|
|
rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* If the sec= mount option is used, the specified flavor or AUTH_NULL
|
|
* must be in the list returned by the server.
|
|
*
|
|
* AUTH_NULL has a special meaning when it's in the server list - it
|
|
* means that the server will ignore the rpc creds, so any flavor
|
|
* can be used.
|
|
*/
|
|
for (i = 0; i < count; i++) {
|
|
flavor = server_authlist[i];
|
|
|
|
if (nfs_auth_info_match(&args->auth_info, flavor) ||
|
|
flavor == RPC_AUTH_NULL)
|
|
goto out;
|
|
}
|
|
|
|
dfprintk(MOUNT,
|
|
"NFS: specified auth flavors not supported by server\n");
|
|
return -EACCES;
|
|
|
|
out:
|
|
args->selected_flavor = flavor;
|
|
dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
struct nfs_fh *root_fh,
|
|
rpc_authflavor_t *server_authlist,
|
|
unsigned int *server_authlist_len)
|
|
{
|
|
struct nfs_mount_request request = {
|
|
.sap = (struct sockaddr *)
|
|
&args->mount_server.address,
|
|
.dirpath = args->nfs_server.export_path,
|
|
.protocol = args->mount_server.protocol,
|
|
.fh = root_fh,
|
|
.noresvport = args->flags & NFS_MOUNT_NORESVPORT,
|
|
.auth_flav_len = server_authlist_len,
|
|
.auth_flavs = server_authlist,
|
|
.net = args->net,
|
|
};
|
|
int status;
|
|
|
|
if (args->mount_server.version == 0) {
|
|
switch (args->version) {
|
|
default:
|
|
args->mount_server.version = NFS_MNT3_VERSION;
|
|
break;
|
|
case 2:
|
|
args->mount_server.version = NFS_MNT_VERSION;
|
|
}
|
|
}
|
|
request.version = args->mount_server.version;
|
|
|
|
if (args->mount_server.hostname)
|
|
request.hostname = args->mount_server.hostname;
|
|
else
|
|
request.hostname = args->nfs_server.hostname;
|
|
|
|
/*
|
|
* Construct the mount server's address.
|
|
*/
|
|
if (args->mount_server.address.ss_family == AF_UNSPEC) {
|
|
memcpy(request.sap, &args->nfs_server.address,
|
|
args->nfs_server.addrlen);
|
|
args->mount_server.addrlen = args->nfs_server.addrlen;
|
|
}
|
|
request.salen = args->mount_server.addrlen;
|
|
nfs_set_port(request.sap, &args->mount_server.port, 0);
|
|
|
|
/*
|
|
* Now ask the mount server to map our export path
|
|
* to a file handle.
|
|
*/
|
|
status = nfs_mount(&request);
|
|
if (status != 0) {
|
|
dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
|
|
request.hostname, status);
|
|
return status;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
|
|
struct nfs_subversion *nfs_mod)
|
|
{
|
|
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);
|
|
if (status)
|
|
return ERR_PTR(status);
|
|
|
|
/*
|
|
* 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);
|
|
dfprintk(MOUNT, "NFS: using auth flavor %u\n",
|
|
args->selected_flavor);
|
|
if (status)
|
|
return ERR_PTR(status);
|
|
return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
|
|
}
|
|
|
|
/*
|
|
* No sec= option was provided. RFC 2623, section 2.7 suggests we
|
|
* SHOULD prefer the flavor listed first. However, some servers list
|
|
* AUTH_NULL first. Avoid ever choosing AUTH_NULL.
|
|
*/
|
|
for (i = 0; i < authlist_len; ++i) {
|
|
rpc_authflavor_t flavor;
|
|
struct rpcsec_gss_info info;
|
|
|
|
flavor = authlist[i];
|
|
switch (flavor) {
|
|
case RPC_AUTH_UNIX:
|
|
tried_auth_unix = true;
|
|
break;
|
|
case RPC_AUTH_NULL:
|
|
auth_null_in_list = true;
|
|
continue;
|
|
default:
|
|
if (rpcauth_get_gssinfo(flavor, &info) != 0)
|
|
continue;
|
|
/* 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);
|
|
if (!IS_ERR(server))
|
|
return server;
|
|
}
|
|
|
|
/*
|
|
* Nothing we tried so far worked. At this point, give up if we've
|
|
* already tried AUTH_UNIX or if the server's list doesn't contain
|
|
* AUTH_NULL
|
|
*/
|
|
if (tried_auth_unix || !auth_null_in_list)
|
|
return server;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
struct dentry *nfs_try_mount(int flags, const char *dev_name,
|
|
struct nfs_mount_info *mount_info,
|
|
struct nfs_subversion *nfs_mod)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
if (mount_info->parsed->need_mount)
|
|
server = nfs_try_mount_request(mount_info, nfs_mod);
|
|
else
|
|
server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
|
|
|
|
if (IS_ERR(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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#if !IS_ENABLED(CONFIG_NFS_V3)
|
|
if (args->version == 3)
|
|
goto out_v3_not_compiled;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
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;
|
|
|
|
#if !IS_ENABLED(CONFIG_NFS_V3)
|
|
out_v3_not_compiled:
|
|
dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
|
|
return -EPROTONOSUPPORT;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
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_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
|
|
| NFS_MOUNT_SECURE \
|
|
| NFS_MOUNT_TCP \
|
|
| NFS_MOUNT_VER3 \
|
|
| NFS_MOUNT_KERBEROS \
|
|
| NFS_MOUNT_NONLM \
|
|
| NFS_MOUNT_BROKEN_SUID \
|
|
| NFS_MOUNT_STRICTLOCK \
|
|
| NFS_MOUNT_UNSHARED \
|
|
| NFS_MOUNT_NORESVPORT \
|
|
| NFS_MOUNT_LEGACY_INTERFACE)
|
|
|
|
static int
|
|
nfs_compare_remount_data(struct nfs_server *nfss,
|
|
struct nfs_parsed_mount_data *data)
|
|
{
|
|
if ((data->flags ^ nfss->flags) & NFS_MOUNT_CMP_FLAGMASK ||
|
|
data->rsize != nfss->rsize ||
|
|
data->wsize != nfss->wsize ||
|
|
data->version != nfss->nfs_client->rpc_ops->version ||
|
|
data->minorversion != nfss->nfs_client->cl_minorversion ||
|
|
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 ||
|
|
!rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
|
|
(struct sockaddr *)&nfss->nfs_client->cl_addr))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
nfs_remount(struct super_block *sb, int *flags, char *raw_data)
|
|
{
|
|
int error;
|
|
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);
|
|
|
|
/*
|
|
* Userspace mount programs that send binary options generally send
|
|
* them populated with default values. We have no way to know which
|
|
* 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))))
|
|
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->auth_info = nfss->auth_info;
|
|
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;
|
|
|
|
/* compare new mount options with old ones */
|
|
error = nfs_compare_remount_data(nfss, data);
|
|
out:
|
|
kfree(data);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_remount);
|
|
|
|
/*
|
|
* Initialise the common bits of the superblock
|
|
*/
|
|
inline void nfs_initialise_sb(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
sb->s_magic = NFS_SUPER_MAGIC;
|
|
|
|
/* We probably want something more informative here */
|
|
snprintf(sb->s_id, sizeof(sb->s_id),
|
|
"%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
|
|
|
|
if (sb->s_blocksize == 0)
|
|
sb->s_blocksize = nfs_block_bits(server->wsize,
|
|
&sb->s_blocksize_bits);
|
|
|
|
sb->s_bdi = &server->backing_dev_info;
|
|
|
|
nfs_super_set_maxbytes(sb, server->maxfilesize);
|
|
}
|
|
|
|
/*
|
|
* Finish setting up an NFS2/3 superblock
|
|
*/
|
|
void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
|
|
{
|
|
struct nfs_parsed_mount_data *data = mount_info->parsed;
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_fill_super);
|
|
|
|
/*
|
|
* Finish setting up a cloned NFS2/3/4 superblock
|
|
*/
|
|
void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
|
|
{
|
|
const struct super_block *old_sb = mount_info->cloned->sb;
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
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;
|
|
}
|
|
|
|
nfs_initialise_sb(sb);
|
|
}
|
|
|
|
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
|
|
{
|
|
const struct nfs_server *a = s->s_fs_info;
|
|
const struct rpc_clnt *clnt_a = a->client;
|
|
const struct rpc_clnt *clnt_b = b->client;
|
|
|
|
if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
|
|
goto Ebusy;
|
|
if (a->nfs_client != b->nfs_client)
|
|
goto Ebusy;
|
|
if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
|
|
goto Ebusy;
|
|
if (a->wsize != b->wsize)
|
|
goto Ebusy;
|
|
if (a->rsize != b->rsize)
|
|
goto Ebusy;
|
|
if (a->acregmin != b->acregmin)
|
|
goto Ebusy;
|
|
if (a->acregmax != b->acregmax)
|
|
goto Ebusy;
|
|
if (a->acdirmin != b->acdirmin)
|
|
goto Ebusy;
|
|
if (a->acdirmax != b->acdirmax)
|
|
goto Ebusy;
|
|
if (b->auth_info.flavor_len > 0 &&
|
|
clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
|
|
goto Ebusy;
|
|
return 1;
|
|
Ebusy:
|
|
return 0;
|
|
}
|
|
|
|
struct nfs_sb_mountdata {
|
|
struct nfs_server *server;
|
|
int mntflags;
|
|
};
|
|
|
|
static int nfs_set_super(struct super_block *s, void *data)
|
|
{
|
|
struct nfs_sb_mountdata *sb_mntdata = data;
|
|
struct nfs_server *server = sb_mntdata->server;
|
|
int ret;
|
|
|
|
s->s_flags = sb_mntdata->mntflags;
|
|
s->s_fs_info = server;
|
|
s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
|
|
ret = set_anon_super(s, server);
|
|
if (ret == 0)
|
|
server->s_dev = s->s_dev;
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_compare_super_address(struct nfs_server *server1,
|
|
struct nfs_server *server2)
|
|
{
|
|
struct sockaddr *sap1, *sap2;
|
|
|
|
sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
|
|
sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
|
|
|
|
if (sap1->sa_family != sap2->sa_family)
|
|
return 0;
|
|
|
|
switch (sap1->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
|
|
struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
|
|
if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
|
|
return 0;
|
|
if (sin1->sin_port != sin2->sin_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
|
|
struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
|
|
if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
|
|
return 0;
|
|
if (sin1->sin6_port != sin2->sin6_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int nfs_compare_super(struct super_block *sb, void *data)
|
|
{
|
|
struct nfs_sb_mountdata *sb_mntdata = data;
|
|
struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
|
|
int mntflags = sb_mntdata->mntflags;
|
|
|
|
if (!nfs_compare_super_address(old, server))
|
|
return 0;
|
|
/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
|
|
if (old->flags & NFS_MOUNT_UNSHARED)
|
|
return 0;
|
|
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
|
|
return 0;
|
|
return nfs_compare_mount_options(sb, server, mntflags);
|
|
}
|
|
|
|
#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_server *nfss = NFS_SB(sb);
|
|
char *uniq = NULL;
|
|
int ulen = 0;
|
|
|
|
nfss->fscache_key = NULL;
|
|
nfss->fscache = NULL;
|
|
|
|
if (parsed) {
|
|
if (!(parsed->options & NFS_OPTION_FSCACHE))
|
|
return;
|
|
if (parsed->fscache_uniq) {
|
|
uniq = parsed->fscache_uniq;
|
|
ulen = strlen(parsed->fscache_uniq);
|
|
}
|
|
} else if (cloned) {
|
|
struct nfs_server *mnt_s = NFS_SB(cloned->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;
|
|
|
|
nfs_fscache_get_super_cookie(sb, uniq, ulen);
|
|
}
|
|
#else
|
|
static void nfs_get_cache_cookie(struct super_block *sb,
|
|
struct nfs_parsed_mount_data *parsed,
|
|
struct nfs_clone_mount *cloned)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int nfs_bdi_register(struct nfs_server *server)
|
|
{
|
|
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
|
|
}
|
|
|
|
int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
|
|
struct nfs_mount_info *mount_info)
|
|
{
|
|
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);
|
|
if (error)
|
|
goto err;
|
|
|
|
if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
|
|
!(kflags_out & SECURITY_LSM_NATIVE_LABELS))
|
|
NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
|
|
err:
|
|
return error;
|
|
}
|
|
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)
|
|
{
|
|
/* clone any lsm security options from the parent to the new sb */
|
|
if (mntroot->d_inode->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);
|
|
}
|
|
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 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,
|
|
.server = server,
|
|
};
|
|
int error;
|
|
|
|
if (server->flags & NFS_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* -o noac implies -o sync */
|
|
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)
|
|
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);
|
|
if (IS_ERR(s)) {
|
|
mntroot = ERR_CAST(s);
|
|
goto out_err_nosb;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error) {
|
|
mntroot = ERR_PTR(error);
|
|
goto error_splat_bdi;
|
|
}
|
|
server->super = s;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
mount_info->fill_super(s, mount_info);
|
|
nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
|
|
}
|
|
|
|
mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
|
|
if (IS_ERR(mntroot))
|
|
goto error_splat_super;
|
|
|
|
error = mount_info->set_security(s, mntroot, mount_info);
|
|
if (error)
|
|
goto error_splat_root;
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
|
|
out:
|
|
return mntroot;
|
|
|
|
out_err_nosb:
|
|
nfs_free_server(server);
|
|
goto out;
|
|
|
|
error_splat_root:
|
|
dput(mntroot);
|
|
mntroot = ERR_PTR(error);
|
|
error_splat_super:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_super(s);
|
|
goto out;
|
|
}
|
|
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);
|
|
|
|
/*
|
|
* Ensure that we unregister the bdi before kill_anon_super
|
|
* releases the device name
|
|
*/
|
|
void nfs_put_super(struct super_block *s)
|
|
{
|
|
struct nfs_server *server = NFS_SB(s);
|
|
|
|
bdi_unregister(&server->backing_dev_info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_put_super);
|
|
|
|
/*
|
|
* Destroy an NFS2/3 superblock
|
|
*/
|
|
void nfs_kill_super(struct super_block *s)
|
|
{
|
|
struct nfs_server *server = NFS_SB(s);
|
|
|
|
kill_anon_super(s);
|
|
nfs_fscache_release_super_cookie(s);
|
|
nfs_free_server(server);
|
|
}
|
|
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
|
|
*/
|
|
unsigned int nfs_callback_set_tcpport;
|
|
unsigned short nfs_callback_tcpport;
|
|
/* Default cache timeout is 10 minutes */
|
|
unsigned int nfs_idmap_cache_timeout = 600;
|
|
/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
|
|
bool nfs4_disable_idmapping = true;
|
|
unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
|
|
unsigned short send_implementation_id = 1;
|
|
char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
|
|
bool recover_lost_locks = false;
|
|
|
|
EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
|
|
EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
|
|
EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
|
|
EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
|
|
EXPORT_SYMBOL_GPL(max_session_slots);
|
|
EXPORT_SYMBOL_GPL(send_implementation_id);
|
|
EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
|
|
EXPORT_SYMBOL_GPL(recover_lost_locks);
|
|
|
|
#define NFS_CALLBACK_MAXPORTNR (65535U)
|
|
|
|
static int param_set_portnr(const char *val, const struct kernel_param *kp)
|
|
{
|
|
unsigned long num;
|
|
int ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
ret = kstrtoul(val, 0, &num);
|
|
if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
|
|
return -EINVAL;
|
|
*((unsigned int *)kp->arg) = num;
|
|
return 0;
|
|
}
|
|
static struct kernel_param_ops param_ops_portnr = {
|
|
.set = param_set_portnr,
|
|
.get = param_get_uint,
|
|
};
|
|
#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
|
|
|
|
module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
|
|
module_param(nfs_idmap_cache_timeout, int, 0644);
|
|
module_param(nfs4_disable_idmapping, bool, 0644);
|
|
module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
|
|
NFS4_CLIENT_ID_UNIQ_LEN, 0600);
|
|
MODULE_PARM_DESC(nfs4_disable_idmapping,
|
|
"Turn off NFSv4 idmapping when using 'sec=sys'");
|
|
module_param(max_session_slots, ushort, 0644);
|
|
MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
|
|
"requests the client will negotiate");
|
|
module_param(send_implementation_id, ushort, 0644);
|
|
MODULE_PARM_DESC(send_implementation_id,
|
|
"Send implementation ID with NFSv4.1 exchange_id");
|
|
MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
|
|
|
|
module_param(recover_lost_locks, bool, 0644);
|
|
MODULE_PARM_DESC(recover_lost_locks,
|
|
"If the server reports that a lock might be lost, "
|
|
"try to recover it risking data corruption.");
|
|
|
|
|
|
#endif /* CONFIG_NFS_V4 */
|