fs/nfs/super.c

   1 /*
   2  *  linux/fs/nfs/super.c
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  nfs superblock handling functions
   7  *
   8  *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
   9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10  *
  11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12  *  J.S.Peatfield@damtp.cam.ac.uk
  13  *
  14  *  Split from inode.c by David Howells <dhowells@redhat.com>
  15  *
  16  * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
  17  *   particular server are held in the same superblock
  18  * - NFS superblocks can have several effective roots to the dentry tree
  19  * - directory type roots are spliced into the tree when a path from one root reaches the root
  20  *   of another (see nfs_lookup())
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25
  26 #include <linux/time.h>
  27 #include <linux/kernel.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/stat.h>
  31 #include <linux/errno.h>
  32 #include <linux/unistd.h>
  33 #include <linux/sunrpc/clnt.h>
  34 #include <linux/sunrpc/stats.h>
  35 #include <linux/sunrpc/metrics.h>
  36 #include <linux/sunrpc/xprtsock.h>
  37 #include <linux/sunrpc/xprtrdma.h>
  38 #include <linux/nfs_fs.h>
  39 #include <linux/nfs_mount.h>
  40 #include <linux/nfs4_mount.h>
  41 #include <linux/lockd/bind.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/mount.h>
  45 #include <linux/nfs_idmap.h>
  46 #include <linux/vfs.h>
  47 #include <linux/inet.h>
  48 #include <linux/in6.h>
  49 #include <net/ipv6.h>
  50 #include <linux/nfs_xdr.h>
  51 #include <linux/magic.h>
  52 #include <linux/parser.h>
  53
  54 #include <asm/system.h>
  55 #include <asm/uaccess.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "callback.h"
  59 #include "delegation.h"
  60 #include "iostat.h"
  61 #include "internal.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_VFS
  64
  65 enum {
  66         /* Mount options that take no arguments */
  67         Opt_soft, Opt_hard,
  68         Opt_intr, Opt_nointr,
  69         Opt_posix, Opt_noposix,
  70         Opt_cto, Opt_nocto,
  71         Opt_ac, Opt_noac,
  72         Opt_lock, Opt_nolock,
  73         Opt_v2, Opt_v3,
  74         Opt_udp, Opt_tcp, Opt_rdma,
  75         Opt_acl, Opt_noacl,
  76         Opt_rdirplus, Opt_nordirplus,
  77         Opt_sharecache, Opt_nosharecache,
  78
  79         /* Mount options that take integer arguments */
  80         Opt_port,
  81         Opt_rsize, Opt_wsize, Opt_bsize,
  82         Opt_timeo, Opt_retrans,
  83         Opt_acregmin, Opt_acregmax,
  84         Opt_acdirmin, Opt_acdirmax,
  85         Opt_actimeo,
  86         Opt_namelen,
  87         Opt_mountport,
  88         Opt_mountvers,
  89         Opt_nfsvers,
  90
  91         /* Mount options that take string arguments */
  92         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
  93         Opt_addr, Opt_mountaddr, Opt_clientaddr,
  94
  95         /* Mount options that are ignored */
  96         Opt_userspace, Opt_deprecated,
  97
  98         Opt_err
  99 };
 100
 101 static match_table_t nfs_mount_option_tokens = {
 102         { Opt_userspace, "bg" },
 103         { Opt_userspace, "fg" },
 104         { Opt_soft, "soft" },
 105         { Opt_hard, "hard" },
 106         { Opt_intr, "intr" },
 107         { Opt_nointr, "nointr" },
 108         { Opt_posix, "posix" },
 109         { Opt_noposix, "noposix" },
 110         { Opt_cto, "cto" },
 111         { Opt_nocto, "nocto" },
 112         { Opt_ac, "ac" },
 113         { Opt_noac, "noac" },
 114         { Opt_lock, "lock" },
 115         { Opt_nolock, "nolock" },
 116         { Opt_v2, "v2" },
 117         { Opt_v3, "v3" },
 118         { Opt_udp, "udp" },
 119         { Opt_tcp, "tcp" },
 120         { Opt_rdma, "rdma" },
 121         { Opt_acl, "acl" },
 122         { Opt_noacl, "noacl" },
 123         { Opt_rdirplus, "rdirplus" },
 124         { Opt_nordirplus, "nordirplus" },
 125         { Opt_sharecache, "sharecache" },
 126         { Opt_nosharecache, "nosharecache" },
 127
 128         { Opt_port, "port=%u" },
 129         { Opt_rsize, "rsize=%u" },
 130         { Opt_wsize, "wsize=%u" },
 131         { Opt_bsize, "bsize=%u" },
 132         { Opt_timeo, "timeo=%u" },
 133         { Opt_retrans, "retrans=%u" },
 134         { Opt_acregmin, "acregmin=%u" },
 135         { Opt_acregmax, "acregmax=%u" },
 136         { Opt_acdirmin, "acdirmin=%u" },
 137         { Opt_acdirmax, "acdirmax=%u" },
 138         { Opt_actimeo, "actimeo=%u" },
 139         { Opt_userspace, "retry=%u" },
 140         { Opt_namelen, "namlen=%u" },
 141         { Opt_mountport, "mountport=%u" },
 142         { Opt_mountvers, "mountvers=%u" },
 143         { Opt_nfsvers, "nfsvers=%u" },
 144         { Opt_nfsvers, "vers=%u" },
 145
 146         { Opt_sec, "sec=%s" },
 147         { Opt_proto, "proto=%s" },
 148         { Opt_mountproto, "mountproto=%s" },
 149         { Opt_addr, "addr=%s" },
 150         { Opt_clientaddr, "clientaddr=%s" },
 151         { Opt_mounthost, "mounthost=%s" },
 152         { Opt_mountaddr, "mountaddr=%s" },
 153
 154         { Opt_err, NULL }
 155 };
 156
 157 enum {
 158         Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 159
 160         Opt_xprt_err
 161 };
 162
 163 static match_table_t nfs_xprt_protocol_tokens = {
 164         { Opt_xprt_udp, "udp" },
 165         { Opt_xprt_tcp, "tcp" },
 166         { Opt_xprt_rdma, "rdma" },
 167
 168         { Opt_xprt_err, NULL }
 169 };
 170
 171 enum {
 172         Opt_sec_none, Opt_sec_sys,
 173         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 174         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 175         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 176
 177         Opt_sec_err
 178 };
 179
 180 static match_table_t nfs_secflavor_tokens = {
 181         { Opt_sec_none, "none" },
 182         { Opt_sec_none, "null" },
 183         { Opt_sec_sys, "sys" },
 184
 185         { Opt_sec_krb5, "krb5" },
 186         { Opt_sec_krb5i, "krb5i" },
 187         { Opt_sec_krb5p, "krb5p" },
 188
 189         { Opt_sec_lkey, "lkey" },
 190         { Opt_sec_lkeyi, "lkeyi" },
 191         { Opt_sec_lkeyp, "lkeyp" },
 192
 193         { Opt_sec_spkm, "spkm3" },
 194         { Opt_sec_spkmi, "spkm3i" },
 195         { Opt_sec_spkmp, "spkm3p" },
 196
 197         { Opt_sec_err, NULL }
 198 };
 199
 200
 201 static void nfs_umount_begin(struct vfsmount *, int);
 202 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 203 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
 204 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
 205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
 206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
 207                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 208 static void nfs_kill_super(struct super_block *);
 209 static void nfs_put_super(struct super_block *);
 210
 211 static struct file_system_type nfs_fs_type = {
 212         .owner          = THIS_MODULE,
 213         .name           = "nfs",
 214         .get_sb         = nfs_get_sb,
 215         .kill_sb        = nfs_kill_super,
 216         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 217 };
 218
 219 struct file_system_type nfs_xdev_fs_type = {
 220         .owner          = THIS_MODULE,
 221         .name           = "nfs",
 222         .get_sb         = nfs_xdev_get_sb,
 223         .kill_sb        = nfs_kill_super,
 224         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 225 };
 226
 227 static const struct super_operations nfs_sops = {
 228         .alloc_inode    = nfs_alloc_inode,
 229         .destroy_inode  = nfs_destroy_inode,
 230         .write_inode    = nfs_write_inode,
 231         .put_super      = nfs_put_super,
 232         .statfs         = nfs_statfs,
 233         .clear_inode    = nfs_clear_inode,
 234         .umount_begin   = nfs_umount_begin,
 235         .show_options   = nfs_show_options,
 236         .show_stats     = nfs_show_stats,
 237 };
 238
 239 #ifdef CONFIG_NFS_V4
 240 static int nfs4_get_sb(struct file_system_type *fs_type,
 241         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 242 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
 243         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 244 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 246 static void nfs4_kill_super(struct super_block *sb);
 247
 248 static struct file_system_type nfs4_fs_type = {
 249         .owner          = THIS_MODULE,
 250         .name           = "nfs4",
 251         .get_sb         = nfs4_get_sb,
 252         .kill_sb        = nfs4_kill_super,
 253         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 254 };
 255
 256 struct file_system_type nfs4_xdev_fs_type = {
 257         .owner          = THIS_MODULE,
 258         .name           = "nfs4",
 259         .get_sb         = nfs4_xdev_get_sb,
 260         .kill_sb        = nfs4_kill_super,
 261         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 262 };
 263
 264 struct file_system_type nfs4_referral_fs_type = {
 265         .owner          = THIS_MODULE,
 266         .name           = "nfs4",
 267         .get_sb         = nfs4_referral_get_sb,
 268         .kill_sb        = nfs4_kill_super,
 269         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 270 };
 271
 272 static const struct super_operations nfs4_sops = {
 273         .alloc_inode    = nfs_alloc_inode,
 274         .destroy_inode  = nfs_destroy_inode,
 275         .write_inode    = nfs_write_inode,
 276         .statfs         = nfs_statfs,
 277         .clear_inode    = nfs4_clear_inode,
 278         .umount_begin   = nfs_umount_begin,
 279         .show_options   = nfs_show_options,
 280         .show_stats     = nfs_show_stats,
 281 };
 282 #endif
 283
 284 static struct shrinker acl_shrinker = {
 285         .shrink         = nfs_access_cache_shrinker,
 286         .seeks          = DEFAULT_SEEKS,
 287 };
 288
 289 /*
 290  * Register the NFS filesystems
 291  */
 292 int __init register_nfs_fs(void)
 293 {
 294         int ret;
 295
 296         ret = register_filesystem(&nfs_fs_type);
 297         if (ret < 0)
 298                 goto error_0;
 299
 300         ret = nfs_register_sysctl();
 301         if (ret < 0)
 302                 goto error_1;
 303 #ifdef CONFIG_NFS_V4
 304         ret = register_filesystem(&nfs4_fs_type);
 305         if (ret < 0)
 306                 goto error_2;
 307 #endif
 308         register_shrinker(&acl_shrinker);
 309         return 0;
 310
 311 #ifdef CONFIG_NFS_V4
 312 error_2:
 313         nfs_unregister_sysctl();
 314 #endif
 315 error_1:
 316         unregister_filesystem(&nfs_fs_type);
 317 error_0:
 318         return ret;
 319 }
 320
 321 /*
 322  * Unregister the NFS filesystems
 323  */
 324 void __exit unregister_nfs_fs(void)
 325 {
 326         unregister_shrinker(&acl_shrinker);
 327 #ifdef CONFIG_NFS_V4
 328         unregister_filesystem(&nfs4_fs_type);
 329 #endif
 330         nfs_unregister_sysctl();
 331         unregister_filesystem(&nfs_fs_type);
 332 }
 333
 334 void nfs_sb_active(struct nfs_server *server)
 335 {
 336         atomic_inc(&server->active);
 337 }
 338
 339 void nfs_sb_deactive(struct nfs_server *server)
 340 {
 341         if (atomic_dec_and_test(&server->active))
 342                 wake_up(&server->active_wq);
 343 }
 344
 345 static void nfs_put_super(struct super_block *sb)
 346 {
 347         struct nfs_server *server = NFS_SB(sb);
 348         /*
 349          * Make sure there are no outstanding ops to this server.
 350          * If so, wait for them to finish before allowing the
 351          * unmount to continue.
 352          */
 353         wait_event(server->active_wq, atomic_read(&server->active) == 0);
 354 }
 355
 356 /*
 357  * Deliver file system statistics to userspace
 358  */
 359 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 360 {
 361         struct nfs_server *server = NFS_SB(dentry->d_sb);
 362         unsigned char blockbits;
 363         unsigned long blockres;
 364         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 365         struct nfs_fattr fattr;
 366         struct nfs_fsstat res = {
 367                         .fattr = &fattr,
 368         };
 369         int error;
 370
 371         lock_kernel();
 372
 373         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 374         if (error < 0)
 375                 goto out_err;
 376         buf->f_type = NFS_SUPER_MAGIC;
 377
 378         /*
 379          * Current versions of glibc do not correctly handle the
 380          * case where f_frsize != f_bsize.  Eventually we want to
 381          * report the value of wtmult in this field.
 382          */
 383         buf->f_frsize = dentry->d_sb->s_blocksize;
 384
 385         /*
 386          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 387          * are reported in units of f_frsize.  Linux hasn't had
 388          * an f_frsize field in its statfs struct until recently,
 389          * thus historically Linux's sys_statfs reports these
 390          * fields in units of f_bsize.
 391          */
 392         buf->f_bsize = dentry->d_sb->s_blocksize;
 393         blockbits = dentry->d_sb->s_blocksize_bits;
 394         blockres = (1 << blockbits) - 1;
 395         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 396         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 397         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 398
 399         buf->f_files = res.tfiles;
 400         buf->f_ffree = res.afiles;
 401
 402         buf->f_namelen = server->namelen;
 403
 404         unlock_kernel();
 405         return 0;
 406
 407  out_err:
 408         dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
 409         unlock_kernel();
 410         return error;
 411 }
 412
 413 /*
 414  * Map the security flavour number to a name
 415  */
 416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 417 {
 418         static const struct {
 419                 rpc_authflavor_t flavour;
 420                 const char *str;
 421         } sec_flavours[] = {
 422                 { RPC_AUTH_NULL, "null" },
 423                 { RPC_AUTH_UNIX, "sys" },
 424                 { RPC_AUTH_GSS_KRB5, "krb5" },
 425                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 426                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 427                 { RPC_AUTH_GSS_LKEY, "lkey" },
 428                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 429                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 430                 { RPC_AUTH_GSS_SPKM, "spkm" },
 431                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 432                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 433                 { UINT_MAX, "unknown" }
 434         };
 435         int i;
 436
 437         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 438                 if (sec_flavours[i].flavour == flavour)
 439                         break;
 440         }
 441         return sec_flavours[i].str;
 442 }
 443
 444 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 445                                     int showdefaults)
 446 {
 447         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
 448
 449         switch (sap->sa_family) {
 450         case AF_INET: {
 451                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 452                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
 453                                 NIPQUAD(sin->sin_addr.s_addr));
 454                 break;
 455         }
 456         case AF_INET6: {
 457                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 458                 seq_printf(m, ",mountaddr=" NIP6_FMT,
 459                                 NIP6(sin6->sin6_addr));
 460                 break;
 461         }
 462         default:
 463                 if (showdefaults)
 464                         seq_printf(m, ",mountaddr=unspecified");
 465         }
 466
 467         if (nfss->mountd_version || showdefaults)
 468                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
 469         if (nfss->mountd_port || showdefaults)
 470                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
 471
 472         switch (nfss->mountd_protocol) {
 473         case IPPROTO_UDP:
 474                 seq_printf(m, ",mountproto=udp");
 475                 break;
 476         case IPPROTO_TCP:
 477                 seq_printf(m, ",mountproto=tcp");
 478                 break;
 479         default:
 480                 if (showdefaults)
 481                         seq_printf(m, ",mountproto=auto");
 482         }
 483 }
 484
 485 /*
 486  * Describe the mount options in force on this server representation
 487  */
 488 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 489                                    int showdefaults)
 490 {
 491         static const struct proc_nfs_info {
 492                 int flag;
 493                 const char *str;
 494                 const char *nostr;
 495         } nfs_info[] = {
 496                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 497                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
 498                 { NFS_MOUNT_POSIX, ",posix", "" },
 499                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 500                 { NFS_MOUNT_NOAC, ",noac", "" },
 501                 { NFS_MOUNT_NONLM, ",nolock", "" },
 502                 { NFS_MOUNT_NOACL, ",noacl", "" },
 503                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 504                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
 505                 { 0, NULL, NULL }
 506         };
 507         const struct proc_nfs_info *nfs_infop;
 508         struct nfs_client *clp = nfss->nfs_client;
 509         u32 version = clp->rpc_ops->version;
 510
 511         seq_printf(m, ",vers=%u", version);
 512         seq_printf(m, ",rsize=%u", nfss->rsize);
 513         seq_printf(m, ",wsize=%u", nfss->wsize);
 514         if (nfss->bsize != 0)
 515                 seq_printf(m, ",bsize=%u", nfss->bsize);
 516         seq_printf(m, ",namlen=%u", nfss->namelen);
 517         if (nfss->acregmin != 3*HZ || showdefaults)
 518                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 519         if (nfss->acregmax != 60*HZ || showdefaults)
 520                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 521         if (nfss->acdirmin != 30*HZ || showdefaults)
 522                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 523         if (nfss->acdirmax != 60*HZ || showdefaults)
 524                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
 525         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 526                 if (nfss->flags & nfs_infop->flag)
 527                         seq_puts(m, nfs_infop->str);
 528                 else
 529                         seq_puts(m, nfs_infop->nostr);
 530         }
 531         seq_printf(m, ",proto=%s",
 532                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 533         if (version == 4) {
 534                 if (nfss->port != NFS_PORT)
 535                         seq_printf(m, ",port=%u", nfss->port);
 536         } else
 537                 if (nfss->port)
 538                         seq_printf(m, ",port=%u", nfss->port);
 539
 540         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 541         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 542         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 543
 544         if (version != 4)
 545                 nfs_show_mountd_options(m, nfss, showdefaults);
 546
 547 #ifdef CONFIG_NFS_V4
 548         if (clp->rpc_ops->version == 4)
 549                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
 550 #endif
 551 }
 552
 553 /*
 554  * Describe the mount options on this VFS mountpoint
 555  */
 556 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 557 {
 558         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 559
 560         nfs_show_mount_options(m, nfss, 0);
 561
 562         seq_printf(m, ",addr=%s",
 563                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 564                                                         RPC_DISPLAY_ADDR));
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Present statistical information for this VFS mountpoint
 571  */
 572 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 573 {
 574         int i, cpu;
 575         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 576         struct rpc_auth *auth = nfss->client->cl_auth;
 577         struct nfs_iostats totals = { };
 578
 579         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 580
 581         /*
 582          * Display all mount option settings
 583          */
 584         seq_printf(m, "\n\topts:\t");
 585         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 586         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 587         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 588         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 589         nfs_show_mount_options(m, nfss, 1);
 590
 591         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 592
 593         seq_printf(m, "\n\tcaps:\t");
 594         seq_printf(m, "caps=0x%x", nfss->caps);
 595         seq_printf(m, ",wtmult=%u", nfss->wtmult);
 596         seq_printf(m, ",dtsize=%u", nfss->dtsize);
 597         seq_printf(m, ",bsize=%u", nfss->bsize);
 598         seq_printf(m, ",namlen=%u", nfss->namelen);
 599
 600 #ifdef CONFIG_NFS_V4
 601         if (nfss->nfs_client->rpc_ops->version == 4) {
 602                 seq_printf(m, "\n\tnfsv4:\t");
 603                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 604                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 605                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 606         }
 607 #endif
 608
 609         /*
 610          * Display security flavor in effect for this mount
 611          */
 612         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
 613         if (auth->au_flavor)
 614                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
 615
 616         /*
 617          * Display superblock I/O counters
 618          */
 619         for_each_possible_cpu(cpu) {
 620                 struct nfs_iostats *stats;
 621
 622                 preempt_disable();
 623                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 624
 625                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 626                         totals.events[i] += stats->events[i];
 627                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 628                         totals.bytes[i] += stats->bytes[i];
 629
 630                 preempt_enable();
 631         }
 632
 633         seq_printf(m, "\n\tevents:\t");
 634         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 635                 seq_printf(m, "%lu ", totals.events[i]);
 636         seq_printf(m, "\n\tbytes:\t");
 637         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 638                 seq_printf(m, "%Lu ", totals.bytes[i]);
 639         seq_printf(m, "\n");
 640
 641         rpc_print_iostats(m, nfss->client);
 642
 643         return 0;
 644 }
 645
 646 /*
 647  * Begin unmount by attempting to remove all automounted mountpoints we added
 648  * in response to xdev traversals and referrals
 649  */
 650 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 651 {
 652         struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
 653         struct rpc_clnt *rpc;
 654
 655         shrink_submounts(vfsmnt, &nfs_automount_list);
 656
 657         if (!(flags & MNT_FORCE))
 658                 return;
 659         /* -EIO all pending I/O */
 660         rpc = server->client_acl;
 661         if (!IS_ERR(rpc))
 662                 rpc_killall_tasks(rpc);
 663         rpc = server->client;
 664         if (!IS_ERR(rpc))
 665                 rpc_killall_tasks(rpc);
 666 }
 667
 668 /*
 669  * Set the port number in an address.  Be agnostic about the address family.
 670  */
 671 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 672 {
 673         switch (sap->sa_family) {
 674         case AF_INET: {
 675                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 676                 ap->sin_port = htons(port);
 677                 break;
 678         }
 679         case AF_INET6: {
 680                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 681                 ap->sin6_port = htons(port);
 682                 break;
 683         }
 684         }
 685 }
 686
 687 /*
 688  * Sanity-check a server address provided by the mount command.
 689  *
 690  * Address family must be initialized, and address must not be
 691  * the ANY address for that family.
 692  */
 693 static int nfs_verify_server_address(struct sockaddr *addr)
 694 {
 695         switch (addr->sa_family) {
 696         case AF_INET: {
 697                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 698                 return sa->sin_addr.s_addr != INADDR_ANY;
 699         }
 700         case AF_INET6: {
 701                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 702                 return !ipv6_addr_any(sa);
 703         }
 704         }
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Parse string addresses passed in via a mount option,
 711  * and construct a sockaddr based on the result.
 712  *
 713  * If address parsing fails, set the sockaddr's address
 714  * family to AF_UNSPEC to force nfs_verify_server_address()
 715  * to punt the mount.
 716  */
 717 static void nfs_parse_server_address(char *value,
 718                                      struct sockaddr *sap,
 719                                      size_t *len)
 720 {
 721         if (strchr(value, ':')) {
 722                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 723                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 724
 725                 ap->sin6_family = AF_INET6;
 726                 *len = sizeof(*ap);
 727                 if (in6_pton(value, -1, addr, '\0', NULL))
 728                         return;
 729         } else {
 730                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 731                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 732
 733                 ap->sin_family = AF_INET;
 734                 *len = sizeof(*ap);
 735                 if (in4_pton(value, -1, addr, '\0', NULL))
 736                         return;
 737         }
 738
 739         sap->sa_family = AF_UNSPEC;
 740         *len = 0;
 741 }
 742
 743 /*
 744  * Error-check and convert a string of mount options from user space into
 745  * a data structure
 746  */
 747 static int nfs_parse_mount_options(char *raw,
 748                                    struct nfs_parsed_mount_data *mnt)
 749 {
 750         char *p, *string, *secdata;
 751         int rc;
 752
 753         if (!raw) {
 754                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 755                 return 1;
 756         }
 757         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 758
 759         secdata = alloc_secdata();
 760         if (!secdata)
 761                 goto out_nomem;
 762
 763         rc = security_sb_copy_data(raw, secdata);
 764         if (rc)
 765                 goto out_security_failure;
 766
 767         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 768         if (rc)
 769                 goto out_security_failure;
 770
 771         free_secdata(secdata);
 772
 773         while ((p = strsep(&raw, ",")) != NULL) {
 774                 substring_t args[MAX_OPT_ARGS];
 775                 int option, token;
 776
 777                 if (!*p)
 778                         continue;
 779
 780                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 781
 782                 token = match_token(p, nfs_mount_option_tokens, args);
 783                 switch (token) {
 784                 case Opt_soft:
 785                         mnt->flags |= NFS_MOUNT_SOFT;
 786                         break;
 787                 case Opt_hard:
 788                         mnt->flags &= ~NFS_MOUNT_SOFT;
 789                         break;
 790                 case Opt_intr:
 791                 case Opt_nointr:
 792                         break;
 793                 case Opt_posix:
 794                         mnt->flags |= NFS_MOUNT_POSIX;
 795                         break;
 796                 case Opt_noposix:
 797                         mnt->flags &= ~NFS_MOUNT_POSIX;
 798                         break;
 799                 case Opt_cto:
 800                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 801                         break;
 802                 case Opt_nocto:
 803                         mnt->flags |= NFS_MOUNT_NOCTO;
 804                         break;
 805                 case Opt_ac:
 806                         mnt->flags &= ~NFS_MOUNT_NOAC;
 807                         break;
 808                 case Opt_noac:
 809                         mnt->flags |= NFS_MOUNT_NOAC;
 810                         break;
 811                 case Opt_lock:
 812                         mnt->flags &= ~NFS_MOUNT_NONLM;
 813                         break;
 814                 case Opt_nolock:
 815                         mnt->flags |= NFS_MOUNT_NONLM;
 816                         break;
 817                 case Opt_v2:
 818                         mnt->flags &= ~NFS_MOUNT_VER3;
 819                         break;
 820                 case Opt_v3:
 821                         mnt->flags |= NFS_MOUNT_VER3;
 822                         break;
 823                 case Opt_udp:
 824                         mnt->flags &= ~NFS_MOUNT_TCP;
 825                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 826                         mnt->timeo = 7;
 827                         mnt->retrans = 5;
 828                         break;
 829                 case Opt_tcp:
 830                         mnt->flags |= NFS_MOUNT_TCP;
 831                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 832                         mnt->timeo = 600;
 833                         mnt->retrans = 2;
 834                         break;
 835                 case Opt_rdma:
 836                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 837                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 838                         mnt->timeo = 600;
 839                         mnt->retrans = 2;
 840                         break;
 841                 case Opt_acl:
 842                         mnt->flags &= ~NFS_MOUNT_NOACL;
 843                         break;
 844                 case Opt_noacl:
 845                         mnt->flags |= NFS_MOUNT_NOACL;
 846                         break;
 847                 case Opt_rdirplus:
 848                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 849                         break;
 850                 case Opt_nordirplus:
 851                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 852                         break;
 853                 case Opt_sharecache:
 854                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 855                         break;
 856                 case Opt_nosharecache:
 857                         mnt->flags |= NFS_MOUNT_UNSHARED;
 858                         break;
 859
 860                 case Opt_port:
 861                         if (match_int(args, &option))
 862                                 return 0;
 863                         if (option < 0 || option > 65535)
 864                                 return 0;
 865                         mnt->nfs_server.port = option;
 866                         break;
 867                 case Opt_rsize:
 868                         if (match_int(args, &mnt->rsize))
 869                                 return 0;
 870                         break;
 871                 case Opt_wsize:
 872                         if (match_int(args, &mnt->wsize))
 873                                 return 0;
 874                         break;
 875                 case Opt_bsize:
 876                         if (match_int(args, &option))
 877                                 return 0;
 878                         if (option < 0)
 879                                 return 0;
 880                         mnt->bsize = option;
 881                         break;
 882                 case Opt_timeo:
 883                         if (match_int(args, &mnt->timeo))
 884                                 return 0;
 885                         break;
 886                 case Opt_retrans:
 887                         if (match_int(args, &mnt->retrans))
 888                                 return 0;
 889                         break;
 890                 case Opt_acregmin:
 891                         if (match_int(args, &mnt->acregmin))
 892                                 return 0;
 893                         break;
 894                 case Opt_acregmax:
 895                         if (match_int(args, &mnt->acregmax))
 896                                 return 0;
 897                         break;
 898                 case Opt_acdirmin:
 899                         if (match_int(args, &mnt->acdirmin))
 900                                 return 0;
 901                         break;
 902                 case Opt_acdirmax:
 903                         if (match_int(args, &mnt->acdirmax))
 904                                 return 0;
 905                         break;
 906                 case Opt_actimeo:
 907                         if (match_int(args, &option))
 908                                 return 0;
 909                         if (option < 0)
 910                                 return 0;
 911                         mnt->acregmin =
 912                         mnt->acregmax =
 913                         mnt->acdirmin =
 914                         mnt->acdirmax = option;
 915                         break;
 916                 case Opt_namelen:
 917                         if (match_int(args, &mnt->namlen))
 918                                 return 0;
 919                         break;
 920                 case Opt_mountport:
 921                         if (match_int(args, &option))
 922                                 return 0;
 923                         if (option < 0 || option > 65535)
 924                                 return 0;
 925                         mnt->mount_server.port = option;
 926                         break;
 927                 case Opt_mountvers:
 928                         if (match_int(args, &option))
 929                                 return 0;
 930                         if (option < 0)
 931                                 return 0;
 932                         mnt->mount_server.version = option;
 933                         break;
 934                 case Opt_nfsvers:
 935                         if (match_int(args, &option))
 936                                 return 0;
 937                         switch (option) {
 938                         case 2:
 939                                 mnt->flags &= ~NFS_MOUNT_VER3;
 940                                 break;
 941                         case 3:
 942                                 mnt->flags |= NFS_MOUNT_VER3;
 943                                 break;
 944                         default:
 945                                 goto out_unrec_vers;
 946                         }
 947                         break;
 948
 949                 case Opt_sec:
 950                         string = match_strdup(args);
 951                         if (string == NULL)
 952                                 goto out_nomem;
 953                         token = match_token(string, nfs_secflavor_tokens, args);
 954                         kfree(string);
 955
 956                         /*
 957                          * The flags setting is for v2/v3.  The flavor_len
 958                          * setting is for v4.  v2/v3 also need to know the
 959                          * difference between NULL and UNIX.
 960                          */
 961                         switch (token) {
 962                         case Opt_sec_none:
 963                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 964                                 mnt->auth_flavor_len = 0;
 965                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 966                                 break;
 967                         case Opt_sec_sys:
 968                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 969                                 mnt->auth_flavor_len = 0;
 970                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 971                                 break;
 972                         case Opt_sec_krb5:
 973                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 974                                 mnt->auth_flavor_len = 1;
 975                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 976                                 break;
 977                         case Opt_sec_krb5i:
 978                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 979                                 mnt->auth_flavor_len = 1;
 980                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 981                                 break;
 982                         case Opt_sec_krb5p:
 983                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 984                                 mnt->auth_flavor_len = 1;
 985                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 986                                 break;
 987                         case Opt_sec_lkey:
 988                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 989                                 mnt->auth_flavor_len = 1;
 990                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 991                                 break;
 992                         case Opt_sec_lkeyi:
 993                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 994                                 mnt->auth_flavor_len = 1;
 995                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 996                                 break;
 997                         case Opt_sec_lkeyp:
 998                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 999                                 mnt->auth_flavor_len = 1;
1000                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1001                                 break;
1002                         case Opt_sec_spkm:
1003                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1004                                 mnt->auth_flavor_len = 1;
1005                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1006                                 break;
1007                         case Opt_sec_spkmi:
1008                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1009                                 mnt->auth_flavor_len = 1;
1010                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1011                                 break;
1012                         case Opt_sec_spkmp:
1013                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1014                                 mnt->auth_flavor_len = 1;
1015                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1016                                 break;
1017                         default:
1018                                 goto out_unrec_sec;
1019                         }
1020                         break;
1021                 case Opt_proto:
1022                         string = match_strdup(args);
1023                         if (string == NULL)
1024                                 goto out_nomem;
1025                         token = match_token(string,
1026                                             nfs_xprt_protocol_tokens, args);
1027                         kfree(string);
1028
1029                         switch (token) {
1030                         case Opt_xprt_udp:
1031                                 mnt->flags &= ~NFS_MOUNT_TCP;
1032                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1033                                 mnt->timeo = 7;
1034                                 mnt->retrans = 5;
1035                                 break;
1036                         case Opt_xprt_tcp:
1037                                 mnt->flags |= NFS_MOUNT_TCP;
1038                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1039                                 mnt->timeo = 600;
1040                                 mnt->retrans = 2;
1041                                 break;
1042                         case Opt_xprt_rdma:
1043                                 /* vector side protocols to TCP */
1044                                 mnt->flags |= NFS_MOUNT_TCP;
1045                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1046                                 mnt->timeo = 600;
1047                                 mnt->retrans = 2;
1048                                 break;
1049                         default:
1050                                 goto out_unrec_xprt;
1051                         }
1052                         break;
1053                 case Opt_mountproto:
1054                         string = match_strdup(args);
1055                         if (string == NULL)
1056                                 goto out_nomem;
1057                         token = match_token(string,
1058                                             nfs_xprt_protocol_tokens, args);
1059                         kfree(string);
1060
1061                         switch (token) {
1062                         case Opt_xprt_udp:
1063                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1064                                 break;
1065                         case Opt_xprt_tcp:
1066                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1067                                 break;
1068                         case Opt_xprt_rdma: /* not used for side protocols */
1069                         default:
1070                                 goto out_unrec_xprt;
1071                         }
1072                         break;
1073                 case Opt_addr:
1074                         string = match_strdup(args);
1075                         if (string == NULL)
1076                                 goto out_nomem;
1077                         nfs_parse_server_address(string, (struct sockaddr *)
1078                                                  &mnt->nfs_server.address,
1079                                                  &mnt->nfs_server.addrlen);
1080                         kfree(string);
1081                         break;
1082                 case Opt_clientaddr:
1083                         string = match_strdup(args);
1084                         if (string == NULL)
1085                                 goto out_nomem;
1086                         kfree(mnt->client_address);
1087                         mnt->client_address = string;
1088                         break;
1089                 case Opt_mounthost:
1090                         string = match_strdup(args);
1091                         if (string == NULL)
1092                                 goto out_nomem;
1093                         kfree(mnt->mount_server.hostname);
1094                         mnt->mount_server.hostname = string;
1095                         break;
1096                 case Opt_mountaddr:
1097                         string = match_strdup(args);
1098                         if (string == NULL)
1099                                 goto out_nomem;
1100                         nfs_parse_server_address(string, (struct sockaddr *)
1101                                                  &mnt->mount_server.address,
1102                                                  &mnt->mount_server.addrlen);
1103                         kfree(string);
1104                         break;
1105
1106                 case Opt_userspace:
1107                 case Opt_deprecated:
1108                         break;
1109
1110                 default:
1111                         goto out_unknown;
1112                 }
1113         }
1114
1115         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1116                                 mnt->nfs_server.port);
1117
1118         return 1;
1119
1120 out_nomem:
1121         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1122         return 0;
1123 out_security_failure:
1124         free_secdata(secdata);
1125         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1126         return 0;
1127 out_unrec_vers:
1128         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1129         return 0;
1130
1131 out_unrec_xprt:
1132         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1133         return 0;
1134
1135 out_unrec_sec:
1136         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1137         return 0;
1138
1139 out_unknown:
1140         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1141         return 0;
1142 }
1143
1144 /*
1145  * Use the remote server's MOUNT service to request the NFS file handle
1146  * corresponding to the provided path.
1147  */
1148 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1149                          struct nfs_fh *root_fh)
1150 {
1151         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1152         char *hostname;
1153         int status;
1154
1155         if (args->mount_server.version == 0) {
1156                 if (args->flags & NFS_MOUNT_VER3)
1157                         args->mount_server.version = NFS_MNT3_VERSION;
1158                 else
1159                         args->mount_server.version = NFS_MNT_VERSION;
1160         }
1161
1162         if (args->mount_server.hostname)
1163                 hostname = args->mount_server.hostname;
1164         else
1165                 hostname = args->nfs_server.hostname;
1166
1167         /*
1168          * Construct the mount server's address.
1169          */
1170         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1171                 memcpy(sap, &args->nfs_server.address,
1172                        args->nfs_server.addrlen);
1173                 args->mount_server.addrlen = args->nfs_server.addrlen;
1174         }
1175
1176         /*
1177          * autobind will be used if mount_server.port == 0
1178          */
1179         nfs_set_port(sap, args->mount_server.port);
1180
1181         /*
1182          * Now ask the mount server to map our export path
1183          * to a file handle.
1184          */
1185         status = nfs_mount(sap,
1186                            args->mount_server.addrlen,
1187                            hostname,
1188                            args->nfs_server.export_path,
1189                            args->mount_server.version,
1190                            args->mount_server.protocol,
1191                            root_fh);
1192         if (status == 0)
1193                 return 0;
1194
1195         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1196                         hostname, status);
1197         return status;
1198 }
1199
1200 /*
1201  * Validate the NFS2/NFS3 mount data
1202  * - fills in the mount root filehandle
1203  *
1204  * For option strings, user space handles the following behaviors:
1205  *
1206  * + DNS: mapping server host name to IP address ("addr=" option)
1207  *
1208  * + failure mode: how to behave if a mount request can't be handled
1209  *   immediately ("fg/bg" option)
1210  *
1211  * + retry: how often to retry a mount request ("retry=" option)
1212  *
1213  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1214  *   mountproto=tcp after mountproto=udp, and so on
1215  */
1216 static int nfs_validate_mount_data(void *options,
1217                                    struct nfs_parsed_mount_data *args,
1218                                    struct nfs_fh *mntfh,
1219                                    const char *dev_name)
1220 {
1221         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1222
1223         memset(args, 0, sizeof(*args));
1224
1225         if (data == NULL)
1226                 goto out_no_data;
1227
1228         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1229         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1230         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1231         args->timeo             = 600;
1232         args->retrans           = 2;
1233         args->acregmin          = 3;
1234         args->acregmax          = 60;
1235         args->acdirmin          = 30;
1236         args->acdirmax          = 60;
1237         args->mount_server.port = 0;    /* autobind unless user sets port */
1238         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1239         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1240         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1241
1242         switch (data->version) {
1243         case 1:
1244                 data->namlen = 0;
1245         case 2:
1246                 data->bsize = 0;
1247         case 3:
1248                 if (data->flags & NFS_MOUNT_VER3)
1249                         goto out_no_v3;
1250                 data->root.size = NFS2_FHSIZE;
1251                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1252         case 4:
1253                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1254                         goto out_no_sec;
1255         case 5:
1256                 memset(data->context, 0, sizeof(data->context));
1257         case 6:
1258                 if (data->flags & NFS_MOUNT_VER3)
1259                         mntfh->size = data->root.size;
1260                 else
1261                         mntfh->size = NFS2_FHSIZE;
1262
1263                 if (mntfh->size > sizeof(mntfh->data))
1264                         goto out_invalid_fh;
1265
1266                 memcpy(mntfh->data, data->root.data, mntfh->size);
1267                 if (mntfh->size < sizeof(mntfh->data))
1268                         memset(mntfh->data + mntfh->size, 0,
1269                                sizeof(mntfh->data) - mntfh->size);
1270
1271                 /*
1272                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1273                  * can deal with.
1274                  */
1275                 args->flags             = data->flags;
1276                 args->rsize             = data->rsize;
1277                 args->wsize             = data->wsize;
1278                 args->flags             = data->flags;
1279                 args->timeo             = data->timeo;
1280                 args->retrans           = data->retrans;
1281                 args->acregmin          = data->acregmin;
1282                 args->acregmax          = data->acregmax;
1283                 args->acdirmin          = data->acdirmin;
1284                 args->acdirmax          = data->acdirmax;
1285
1286                 memcpy(&args->nfs_server.address, &data->addr,
1287                        sizeof(data->addr));
1288                 args->nfs_server.addrlen = sizeof(data->addr);
1289                 if (!nfs_verify_server_address((struct sockaddr *)
1290                                                 &args->nfs_server.address))
1291                         goto out_no_address;
1292
1293                 if (!(data->flags & NFS_MOUNT_TCP))
1294                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1295                 /* N.B. caller will free nfs_server.hostname in all cases */
1296                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1297                 args->namlen            = data->namlen;
1298                 args->bsize             = data->bsize;
1299                 args->auth_flavors[0]   = data->pseudoflavor;
1300
1301                 /*
1302                  * The legacy version 6 binary mount data from userspace has a
1303                  * field used only to transport selinux information into the
1304                  * the kernel.  To continue to support that functionality we
1305                  * have a touch of selinux knowledge here in the NFS code. The
1306                  * userspace code converted context=blah to just blah so we are
1307                  * converting back to the full string selinux understands.
1308                  */
1309                 if (data->context[0]){
1310 #ifdef CONFIG_SECURITY_SELINUX
1311                         int rc;
1312                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1313                         if (!opts_str)
1314                                 return -ENOMEM;
1315                         strcpy(opts_str, "context=");
1316                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1317                         strcat(opts_str, &data->context[0]);
1318                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1319                         kfree(opts_str);
1320                         if (rc)
1321                                 return rc;
1322 #else
1323                         return -EINVAL;
1324 #endif
1325                 }
1326
1327                 break;
1328         default: {
1329                 unsigned int len;
1330                 char *c;
1331                 int status;
1332
1333                 if (nfs_parse_mount_options((char *)options, args) == 0)
1334                         return -EINVAL;
1335
1336                 if (!nfs_verify_server_address((struct sockaddr *)
1337                                                 &args->nfs_server.address))
1338                         goto out_no_address;
1339
1340                 c = strchr(dev_name, ':');
1341                 if (c == NULL)
1342                         return -EINVAL;
1343                 len = c - dev_name;
1344                 /* N.B. caller will free nfs_server.hostname in all cases */
1345                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1346
1347                 c++;
1348                 if (strlen(c) > NFS_MAXPATHLEN)
1349                         return -ENAMETOOLONG;
1350                 args->nfs_server.export_path = c;
1351
1352                 status = nfs_try_mount(args, mntfh);
1353                 if (status)
1354                         return status;
1355
1356                 break;
1357                 }
1358         }
1359
1360         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1361                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1362
1363 #ifndef CONFIG_NFS_V3
1364         if (args->flags & NFS_MOUNT_VER3)
1365                 goto out_v3_not_compiled;
1366 #endif /* !CONFIG_NFS_V3 */
1367
1368         return 0;
1369
1370 out_no_data:
1371         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1372         return -EINVAL;
1373
1374 out_no_v3:
1375         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1376                  data->version);
1377         return -EINVAL;
1378
1379 out_no_sec:
1380         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1381         return -EINVAL;
1382
1383 #ifndef CONFIG_NFS_V3
1384 out_v3_not_compiled:
1385         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1386         return -EPROTONOSUPPORT;
1387 #endif /* !CONFIG_NFS_V3 */
1388
1389 out_no_address:
1390         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1391         return -EINVAL;
1392
1393 out_invalid_fh:
1394         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1395         return -EINVAL;
1396 }
1397
1398 /*
1399  * Initialise the common bits of the superblock
1400  */
1401 static inline void nfs_initialise_sb(struct super_block *sb)
1402 {
1403         struct nfs_server *server = NFS_SB(sb);
1404
1405         sb->s_magic = NFS_SUPER_MAGIC;
1406
1407         /* We probably want something more informative here */
1408         snprintf(sb->s_id, sizeof(sb->s_id),
1409                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1410
1411         if (sb->s_blocksize == 0)
1412                 sb->s_blocksize = nfs_block_bits(server->wsize,
1413                                                  &sb->s_blocksize_bits);
1414
1415         if (server->flags & NFS_MOUNT_NOAC)
1416                 sb->s_flags |= MS_SYNCHRONOUS;
1417
1418         nfs_super_set_maxbytes(sb, server->maxfilesize);
1419 }
1420
1421 /*
1422  * Finish setting up an NFS2/3 superblock
1423  */
1424 static void nfs_fill_super(struct super_block *sb,
1425                            struct nfs_parsed_mount_data *data)
1426 {
1427         struct nfs_server *server = NFS_SB(sb);
1428
1429         sb->s_blocksize_bits = 0;
1430         sb->s_blocksize = 0;
1431         if (data->bsize)
1432                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1433
1434         if (server->flags & NFS_MOUNT_VER3) {
1435                 /* The VFS shouldn't apply the umask to mode bits. We will do
1436                  * so ourselves when necessary.
1437                  */
1438                 sb->s_flags |= MS_POSIXACL;
1439                 sb->s_time_gran = 1;
1440         }
1441
1442         sb->s_op = &nfs_sops;
1443         nfs_initialise_sb(sb);
1444 }
1445
1446 /*
1447  * Finish setting up a cloned NFS2/3 superblock
1448  */
1449 static void nfs_clone_super(struct super_block *sb,
1450                             const struct super_block *old_sb)
1451 {
1452         struct nfs_server *server = NFS_SB(sb);
1453
1454         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1455         sb->s_blocksize = old_sb->s_blocksize;
1456         sb->s_maxbytes = old_sb->s_maxbytes;
1457
1458         if (server->flags & NFS_MOUNT_VER3) {
1459                 /* The VFS shouldn't apply the umask to mode bits. We will do
1460                  * so ourselves when necessary.
1461                  */
1462                 sb->s_flags |= MS_POSIXACL;
1463                 sb->s_time_gran = 1;
1464         }
1465
1466         sb->s_op = old_sb->s_op;
1467         nfs_initialise_sb(sb);
1468 }
1469
1470 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1471
1472 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1473 {
1474         const struct nfs_server *a = s->s_fs_info;
1475         const struct rpc_clnt *clnt_a = a->client;
1476         const struct rpc_clnt *clnt_b = b->client;
1477
1478         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1479                 goto Ebusy;
1480         if (a->nfs_client != b->nfs_client)
1481                 goto Ebusy;
1482         if (a->flags != b->flags)
1483                 goto Ebusy;
1484         if (a->wsize != b->wsize)
1485                 goto Ebusy;
1486         if (a->rsize != b->rsize)
1487                 goto Ebusy;
1488         if (a->acregmin != b->acregmin)
1489                 goto Ebusy;
1490         if (a->acregmax != b->acregmax)
1491                 goto Ebusy;
1492         if (a->acdirmin != b->acdirmin)
1493                 goto Ebusy;
1494         if (a->acdirmax != b->acdirmax)
1495                 goto Ebusy;
1496         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1497                 goto Ebusy;
1498         return 1;
1499 Ebusy:
1500         return 0;
1501 }
1502
1503 struct nfs_sb_mountdata {
1504         struct nfs_server *server;
1505         int mntflags;
1506 };
1507
1508 static int nfs_set_super(struct super_block *s, void *data)
1509 {
1510         struct nfs_sb_mountdata *sb_mntdata = data;
1511         struct nfs_server *server = sb_mntdata->server;
1512         int ret;
1513
1514         s->s_flags = sb_mntdata->mntflags;
1515         s->s_fs_info = server;
1516         ret = set_anon_super(s, server);
1517         if (ret == 0)
1518                 server->s_dev = s->s_dev;
1519         return ret;
1520 }
1521
1522 static int nfs_compare_super_address(struct nfs_server *server1,
1523                                      struct nfs_server *server2)
1524 {
1525         struct sockaddr *sap1, *sap2;
1526
1527         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1528         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1529
1530         if (sap1->sa_family != sap2->sa_family)
1531                 return 0;
1532
1533         switch (sap1->sa_family) {
1534         case AF_INET: {
1535                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1536                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1537                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1538                         return 0;
1539                 if (sin1->sin_port != sin2->sin_port)
1540                         return 0;
1541                 break;
1542         }
1543         case AF_INET6: {
1544                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1545                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1546                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1547                         return 0;
1548                 if (sin1->sin6_port != sin2->sin6_port)
1549                         return 0;
1550                 break;
1551         }
1552         default:
1553                 return 0;
1554         }
1555
1556         return 1;
1557 }
1558
1559 static int nfs_compare_super(struct super_block *sb, void *data)
1560 {
1561         struct nfs_sb_mountdata *sb_mntdata = data;
1562         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1563         int mntflags = sb_mntdata->mntflags;
1564
1565         if (!nfs_compare_super_address(old, server))
1566                 return 0;
1567         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1568         if (old->flags & NFS_MOUNT_UNSHARED)
1569                 return 0;
1570         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1571                 return 0;
1572         return nfs_compare_mount_options(sb, server, mntflags);
1573 }
1574
1575 static int nfs_get_sb(struct file_system_type *fs_type,
1576         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1577 {
1578         struct nfs_server *server = NULL;
1579         struct super_block *s;
1580         struct nfs_fh mntfh;
1581         struct nfs_parsed_mount_data data;
1582         struct dentry *mntroot;
1583         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1584         struct nfs_sb_mountdata sb_mntdata = {
1585                 .mntflags = flags,
1586         };
1587         int error;
1588
1589         security_init_mnt_opts(&data.lsm_opts);
1590
1591         /* Validate the mount data */
1592         error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1593         if (error < 0)
1594                 goto out;
1595
1596         /* Get a volume representation */
1597         server = nfs_create_server(&data, &mntfh);
1598         if (IS_ERR(server)) {
1599                 error = PTR_ERR(server);
1600                 goto out;
1601         }
1602         sb_mntdata.server = server;
1603
1604         if (server->flags & NFS_MOUNT_UNSHARED)
1605                 compare_super = NULL;
1606
1607         /* Get a superblock - note that we may end up sharing one that already exists */
1608         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1609         if (IS_ERR(s)) {
1610                 error = PTR_ERR(s);
1611                 goto out_err_nosb;
1612         }
1613
1614         if (s->s_fs_info != server) {
1615                 nfs_free_server(server);
1616                 server = NULL;
1617         }
1618
1619         if (!s->s_root) {
1620                 /* initial superblock/root creation */
1621                 nfs_fill_super(s, &data);
1622         }
1623
1624         mntroot = nfs_get_root(s, &mntfh);
1625         if (IS_ERR(mntroot)) {
1626                 error = PTR_ERR(mntroot);
1627                 goto error_splat_super;
1628         }
1629
1630         error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1631         if (error)
1632                 goto error_splat_root;
1633
1634         s->s_flags |= MS_ACTIVE;
1635         mnt->mnt_sb = s;
1636         mnt->mnt_root = mntroot;
1637         error = 0;
1638
1639 out:
1640         kfree(data.nfs_server.hostname);
1641         kfree(data.mount_server.hostname);
1642         security_free_mnt_opts(&data.lsm_opts);
1643         return error;
1644
1645 out_err_nosb:
1646         nfs_free_server(server);
1647         goto out;
1648
1649 error_splat_root:
1650         dput(mntroot);
1651 error_splat_super:
1652         up_write(&s->s_umount);
1653         deactivate_super(s);
1654         goto out;
1655 }
1656
1657 /*
1658  * Destroy an NFS2/3 superblock
1659  */
1660 static void nfs_kill_super(struct super_block *s)
1661 {
1662         struct nfs_server *server = NFS_SB(s);
1663
1664         kill_anon_super(s);
1665         nfs_free_server(server);
1666 }
1667
1668 /*
1669  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1670  */
1671 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1672                            const char *dev_name, void *raw_data,
1673                            struct vfsmount *mnt)
1674 {
1675         struct nfs_clone_mount *data = raw_data;
1676         struct super_block *s;
1677         struct nfs_server *server;
1678         struct dentry *mntroot;
1679         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1680         struct nfs_sb_mountdata sb_mntdata = {
1681                 .mntflags = flags,
1682         };
1683         int error;
1684
1685         dprintk("--> nfs_xdev_get_sb()\n");
1686
1687         /* create a new volume representation */
1688         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1689         if (IS_ERR(server)) {
1690                 error = PTR_ERR(server);
1691                 goto out_err_noserver;
1692         }
1693         sb_mntdata.server = server;
1694
1695         if (server->flags & NFS_MOUNT_UNSHARED)
1696                 compare_super = NULL;
1697
1698         /* Get a superblock - note that we may end up sharing one that already exists */
1699         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1700         if (IS_ERR(s)) {
1701                 error = PTR_ERR(s);
1702                 goto out_err_nosb;
1703         }
1704
1705         if (s->s_fs_info != server) {
1706                 nfs_free_server(server);
1707                 server = NULL;
1708         }
1709
1710         if (!s->s_root) {
1711                 /* initial superblock/root creation */
1712                 nfs_clone_super(s, data->sb);
1713         }
1714
1715         mntroot = nfs_get_root(s, data->fh);
1716         if (IS_ERR(mntroot)) {
1717                 error = PTR_ERR(mntroot);
1718                 goto error_splat_super;
1719         }
1720         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1721                 dput(mntroot);
1722                 error = -ESTALE;
1723                 goto error_splat_super;
1724         }
1725
1726         s->s_flags |= MS_ACTIVE;
1727         mnt->mnt_sb = s;
1728         mnt->mnt_root = mntroot;
1729
1730         /* clone any lsm security options from the parent to the new sb */
1731         security_sb_clone_mnt_opts(data->sb, s);
1732
1733         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1734         return 0;
1735
1736 out_err_nosb:
1737         nfs_free_server(server);
1738 out_err_noserver:
1739         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1740         return error;
1741
1742 error_splat_super:
1743         up_write(&s->s_umount);
1744         deactivate_super(s);
1745         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1746         return error;
1747 }
1748
1749 #ifdef CONFIG_NFS_V4
1750
1751 /*
1752  * Finish setting up a cloned NFS4 superblock
1753  */
1754 static void nfs4_clone_super(struct super_block *sb,
1755                             const struct super_block *old_sb)
1756 {
1757         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1758         sb->s_blocksize = old_sb->s_blocksize;
1759         sb->s_maxbytes = old_sb->s_maxbytes;
1760         sb->s_time_gran = 1;
1761         sb->s_op = old_sb->s_op;
1762         nfs_initialise_sb(sb);
1763 }
1764
1765 /*
1766  * Set up an NFS4 superblock
1767  */
1768 static void nfs4_fill_super(struct super_block *sb)
1769 {
1770         sb->s_time_gran = 1;
1771         sb->s_op = &nfs4_sops;
1772         nfs_initialise_sb(sb);
1773 }
1774
1775 /*
1776  * Validate NFSv4 mount options
1777  */
1778 static int nfs4_validate_mount_data(void *options,
1779                                     struct nfs_parsed_mount_data *args,
1780                                     const char *dev_name)
1781 {
1782         struct sockaddr_in *ap;
1783         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1784         char *c;
1785
1786         memset(args, 0, sizeof(*args));
1787
1788         if (data == NULL)
1789                 goto out_no_data;
1790
1791         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1792         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1793         args->timeo             = 600;
1794         args->retrans           = 2;
1795         args->acregmin          = 3;
1796         args->acregmax          = 60;
1797         args->acdirmin          = 30;
1798         args->acdirmax          = 60;
1799         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1800         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1801
1802         switch (data->version) {
1803         case 1:
1804                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1805                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1806                         goto out_no_address;
1807                 if (data->host_addrlen == 0)
1808                         goto out_no_address;
1809                 args->nfs_server.addrlen = data->host_addrlen;
1810                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1811                         return -EFAULT;
1812                 if (!nfs_verify_server_address((struct sockaddr *)
1813                                                 &args->nfs_server.address))
1814                         goto out_no_address;
1815
1816                 switch (data->auth_flavourlen) {
1817                 case 0:
1818                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1819                         break;
1820                 case 1:
1821                         if (copy_from_user(&args->auth_flavors[0],
1822                                            data->auth_flavours,
1823                                            sizeof(args->auth_flavors[0])))
1824                                 return -EFAULT;
1825                         break;
1826                 default:
1827                         goto out_inval_auth;
1828                 }
1829
1830                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1831                 if (IS_ERR(c))
1832                         return PTR_ERR(c);
1833                 args->nfs_server.hostname = c;
1834
1835                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1836                 if (IS_ERR(c))
1837                         return PTR_ERR(c);
1838                 args->nfs_server.export_path = c;
1839                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1840
1841                 c = strndup_user(data->client_addr.data, 16);
1842                 if (IS_ERR(c))
1843                         return PTR_ERR(c);
1844                 args->client_address = c;
1845
1846                 /*
1847                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1848                  * can deal with.
1849                  */
1850
1851                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1852                 args->rsize     = data->rsize;
1853                 args->wsize     = data->wsize;
1854                 args->timeo     = data->timeo;
1855                 args->retrans   = data->retrans;
1856                 args->acregmin  = data->acregmin;
1857                 args->acregmax  = data->acregmax;
1858                 args->acdirmin  = data->acdirmin;
1859                 args->acdirmax  = data->acdirmax;
1860                 args->nfs_server.protocol = data->proto;
1861
1862                 break;
1863         default: {
1864                 unsigned int len;
1865
1866                 if (nfs_parse_mount_options((char *)options, args) == 0)
1867                         return -EINVAL;
1868
1869                 if (!nfs_verify_server_address((struct sockaddr *)
1870                                                 &args->nfs_server.address))
1871                         return -EINVAL;
1872
1873                 switch (args->auth_flavor_len) {
1874                 case 0:
1875                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1876                         break;
1877                 case 1:
1878                         break;
1879                 default:
1880                         goto out_inval_auth;
1881                 }
1882
1883                 /*
1884                  * Split "dev_name" into "hostname:mntpath".
1885                  */
1886                 c = strchr(dev_name, ':');
1887                 if (c == NULL)
1888                         return -EINVAL;
1889                 /* while calculating len, pretend ':' is '\0' */
1890                 len = c - dev_name;
1891                 if (len > NFS4_MAXNAMLEN)
1892                         return -ENAMETOOLONG;
1893                 /* N.B. caller will free nfs_server.hostname in all cases */
1894                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1895
1896                 c++;                    /* step over the ':' */
1897                 len = strlen(c);
1898                 if (len > NFS4_MAXPATHLEN)
1899                         return -ENAMETOOLONG;
1900                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1901
1902                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1903
1904                 if (args->client_address == NULL)
1905                         goto out_no_client_address;
1906
1907                 break;
1908                 }
1909         }
1910
1911         return 0;
1912
1913 out_no_data:
1914         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1915         return -EINVAL;
1916
1917 out_inval_auth:
1918         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1919                  data->auth_flavourlen);
1920         return -EINVAL;
1921
1922 out_no_address:
1923         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1924         return -EINVAL;
1925
1926 out_no_client_address:
1927         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1928         return -EINVAL;
1929 }
1930
1931 /*
1932  * Get the superblock for an NFS4 mountpoint
1933  */
1934 static int nfs4_get_sb(struct file_system_type *fs_type,
1935         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1936 {
1937         struct nfs_parsed_mount_data data;
1938         struct super_block *s;
1939         struct nfs_server *server;
1940         struct nfs_fh mntfh;
1941         struct dentry *mntroot;
1942         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1943         struct nfs_sb_mountdata sb_mntdata = {
1944                 .mntflags = flags,
1945         };
1946         int error;
1947
1948         security_init_mnt_opts(&data.lsm_opts);
1949
1950         /* Validate the mount data */
1951         error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1952         if (error < 0)
1953                 goto out;
1954
1955         /* Get a volume representation */
1956         server = nfs4_create_server(&data, &mntfh);
1957         if (IS_ERR(server)) {
1958                 error = PTR_ERR(server);
1959                 goto out;
1960         }
1961         sb_mntdata.server = server;
1962
1963         if (server->flags & NFS4_MOUNT_UNSHARED)
1964                 compare_super = NULL;
1965
1966         /* Get a superblock - note that we may end up sharing one that already exists */
1967         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1968         if (IS_ERR(s)) {
1969                 error = PTR_ERR(s);
1970                 goto out_free;
1971         }
1972
1973         if (s->s_fs_info != server) {
1974                 nfs_free_server(server);
1975                 server = NULL;
1976         }
1977
1978         if (!s->s_root) {
1979                 /* initial superblock/root creation */
1980                 nfs4_fill_super(s);
1981         }
1982
1983         mntroot = nfs4_get_root(s, &mntfh);
1984         if (IS_ERR(mntroot)) {
1985                 error = PTR_ERR(mntroot);
1986                 goto error_splat_super;
1987         }
1988
1989         s->s_flags |= MS_ACTIVE;
1990         mnt->mnt_sb = s;
1991         mnt->mnt_root = mntroot;
1992         error = 0;
1993
1994 out:
1995         kfree(data.client_address);
1996         kfree(data.nfs_server.export_path);
1997         kfree(data.nfs_server.hostname);
1998         security_free_mnt_opts(&data.lsm_opts);
1999         return error;
2000
2001 out_free:
2002         nfs_free_server(server);
2003         goto out;
2004
2005 error_splat_super:
2006         up_write(&s->s_umount);
2007         deactivate_super(s);
2008         goto out;
2009 }
2010
2011 static void nfs4_kill_super(struct super_block *sb)
2012 {
2013         struct nfs_server *server = NFS_SB(sb);
2014
2015         nfs_return_all_delegations(sb);
2016         kill_anon_super(sb);
2017
2018         nfs4_renewd_prepare_shutdown(server);
2019         nfs_free_server(server);
2020 }
2021
2022 /*
2023  * Clone an NFS4 server record on xdev traversal (FSID-change)
2024  */
2025 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2026                             const char *dev_name, void *raw_data,
2027                             struct vfsmount *mnt)
2028 {
2029         struct nfs_clone_mount *data = raw_data;
2030         struct super_block *s;
2031         struct nfs_server *server;
2032         struct dentry *mntroot;
2033         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2034         struct nfs_sb_mountdata sb_mntdata = {
2035                 .mntflags = flags,
2036         };
2037         int error;
2038
2039         dprintk("--> nfs4_xdev_get_sb()\n");
2040
2041         /* create a new volume representation */
2042         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2043         if (IS_ERR(server)) {
2044                 error = PTR_ERR(server);
2045                 goto out_err_noserver;
2046         }
2047         sb_mntdata.server = server;
2048
2049         if (server->flags & NFS4_MOUNT_UNSHARED)
2050                 compare_super = NULL;
2051
2052         /* Get a superblock - note that we may end up sharing one that already exists */
2053         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2054         if (IS_ERR(s)) {
2055                 error = PTR_ERR(s);
2056                 goto out_err_nosb;
2057         }
2058
2059         if (s->s_fs_info != server) {
2060                 nfs_free_server(server);
2061                 server = NULL;
2062         }
2063
2064         if (!s->s_root) {
2065                 /* initial superblock/root creation */
2066                 nfs4_clone_super(s, data->sb);
2067         }
2068
2069         mntroot = nfs4_get_root(s, data->fh);
2070         if (IS_ERR(mntroot)) {
2071                 error = PTR_ERR(mntroot);
2072                 goto error_splat_super;
2073         }
2074         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2075                 dput(mntroot);
2076                 error = -ESTALE;
2077                 goto error_splat_super;
2078         }
2079
2080         s->s_flags |= MS_ACTIVE;
2081         mnt->mnt_sb = s;
2082         mnt->mnt_root = mntroot;
2083
2084         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2085         return 0;
2086
2087 out_err_nosb:
2088         nfs_free_server(server);
2089 out_err_noserver:
2090         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2091         return error;
2092
2093 error_splat_super:
2094         up_write(&s->s_umount);
2095         deactivate_super(s);
2096         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2097         return error;
2098 }
2099
2100 /*
2101  * Create an NFS4 server record on referral traversal
2102  */
2103 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2104                                 const char *dev_name, void *raw_data,
2105                                 struct vfsmount *mnt)
2106 {
2107         struct nfs_clone_mount *data = raw_data;
2108         struct super_block *s;
2109         struct nfs_server *server;
2110         struct dentry *mntroot;
2111         struct nfs_fh mntfh;
2112         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2113         struct nfs_sb_mountdata sb_mntdata = {
2114                 .mntflags = flags,
2115         };
2116         int error;
2117
2118         dprintk("--> nfs4_referral_get_sb()\n");
2119
2120         /* create a new volume representation */
2121         server = nfs4_create_referral_server(data, &mntfh);
2122         if (IS_ERR(server)) {
2123                 error = PTR_ERR(server);
2124                 goto out_err_noserver;
2125         }
2126         sb_mntdata.server = server;
2127
2128         if (server->flags & NFS4_MOUNT_UNSHARED)
2129                 compare_super = NULL;
2130
2131         /* Get a superblock - note that we may end up sharing one that already exists */
2132         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2133         if (IS_ERR(s)) {
2134                 error = PTR_ERR(s);
2135                 goto out_err_nosb;
2136         }
2137
2138         if (s->s_fs_info != server) {
2139                 nfs_free_server(server);
2140                 server = NULL;
2141         }
2142
2143         if (!s->s_root) {
2144                 /* initial superblock/root creation */
2145                 nfs4_fill_super(s);
2146         }
2147
2148         mntroot = nfs4_get_root(s, &mntfh);
2149         if (IS_ERR(mntroot)) {
2150                 error = PTR_ERR(mntroot);
2151                 goto error_splat_super;
2152         }
2153         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2154                 dput(mntroot);
2155                 error = -ESTALE;
2156                 goto error_splat_super;
2157         }
2158
2159         s->s_flags |= MS_ACTIVE;
2160         mnt->mnt_sb = s;
2161         mnt->mnt_root = mntroot;
2162
2163         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2164         return 0;
2165
2166 out_err_nosb:
2167         nfs_free_server(server);
2168 out_err_noserver:
2169         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2170         return error;
2171
2172 error_splat_super:
2173         up_write(&s->s_umount);
2174         deactivate_super(s);
2175         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2176         return error;
2177 }
2178
2179 #endif /* CONFIG_NFS_V4 */