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   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/nfs_fs.h>
  37 #include <linux/nfs_mount.h>
  38 #include <linux/nfs4_mount.h>
  39 #include <linux/lockd/bind.h>
  40 #include <linux/smp_lock.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/mount.h>
  43 #include <linux/nfs_idmap.h>
  44 #include <linux/vfs.h>
  45 #include <linux/inet.h>
  46 #include <linux/nfs_xdr.h>
  47 #include <linux/magic.h>
  48 #include <linux/parser.h>
  49
  50 #include <asm/system.h>
  51 #include <asm/uaccess.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "callback.h"
  55 #include "delegation.h"
  56 #include "iostat.h"
  57 #include "internal.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_VFS
  60
  61
  62 struct nfs_parsed_mount_data {
  63         int                     flags;
  64         int                     rsize, wsize;
  65         int                     timeo, retrans;
  66         int                     acregmin, acregmax,
  67                                 acdirmin, acdirmax;
  68         int                     namlen;
  69         unsigned int            bsize;
  70         unsigned int            auth_flavor_len;
  71         rpc_authflavor_t        auth_flavors[1];
  72         char                    *client_address;
  73
  74         struct {
  75                 struct sockaddr_in      address;
  76                 unsigned int            program;
  77                 unsigned int            version;
  78                 unsigned short          port;
  79                 int                     protocol;
  80         } mount_server;
  81
  82         struct {
  83                 struct sockaddr_in      address;
  84                 char                    *hostname;
  85                 char                    *export_path;
  86                 unsigned int            program;
  87                 int                     protocol;
  88         } nfs_server;
  89 };
  90
  91 enum {
  92         /* Mount options that take no arguments */
  93         Opt_soft, Opt_hard,
  94         Opt_intr, Opt_nointr,
  95         Opt_posix, Opt_noposix,
  96         Opt_cto, Opt_nocto,
  97         Opt_ac, Opt_noac,
  98         Opt_lock, Opt_nolock,
  99         Opt_v2, Opt_v3,
 100         Opt_udp, Opt_tcp,
 101         Opt_acl, Opt_noacl,
 102         Opt_rdirplus, Opt_nordirplus,
 103
 104         /* Mount options that take integer arguments */
 105         Opt_port,
 106         Opt_rsize, Opt_wsize, Opt_bsize,
 107         Opt_timeo, Opt_retrans,
 108         Opt_acregmin, Opt_acregmax,
 109         Opt_acdirmin, Opt_acdirmax,
 110         Opt_actimeo,
 111         Opt_namelen,
 112         Opt_mountport,
 113         Opt_mountprog, Opt_mountvers,
 114         Opt_nfsprog, Opt_nfsvers,
 115
 116         /* Mount options that take string arguments */
 117         Opt_sec, Opt_proto, Opt_mountproto,
 118         Opt_addr, Opt_mounthost, Opt_clientaddr,
 119
 120         /* Mount options that are ignored */
 121         Opt_userspace, Opt_deprecated,
 122
 123         Opt_err
 124 };
 125
 126 static match_table_t nfs_mount_option_tokens = {
 127         { Opt_userspace, "bg" },
 128         { Opt_userspace, "fg" },
 129         { Opt_soft, "soft" },
 130         { Opt_hard, "hard" },
 131         { Opt_intr, "intr" },
 132         { Opt_nointr, "nointr" },
 133         { Opt_posix, "posix" },
 134         { Opt_noposix, "noposix" },
 135         { Opt_cto, "cto" },
 136         { Opt_nocto, "nocto" },
 137         { Opt_ac, "ac" },
 138         { Opt_noac, "noac" },
 139         { Opt_lock, "lock" },
 140         { Opt_nolock, "nolock" },
 141         { Opt_v2, "v2" },
 142         { Opt_v3, "v3" },
 143         { Opt_udp, "udp" },
 144         { Opt_tcp, "tcp" },
 145         { Opt_acl, "acl" },
 146         { Opt_noacl, "noacl" },
 147         { Opt_rdirplus, "rdirplus" },
 148         { Opt_nordirplus, "nordirplus" },
 149
 150         { Opt_port, "port=%u" },
 151         { Opt_rsize, "rsize=%u" },
 152         { Opt_wsize, "wsize=%u" },
 153         { Opt_bsize, "bsize=%u" },
 154         { Opt_timeo, "timeo=%u" },
 155         { Opt_retrans, "retrans=%u" },
 156         { Opt_acregmin, "acregmin=%u" },
 157         { Opt_acregmax, "acregmax=%u" },
 158         { Opt_acdirmin, "acdirmin=%u" },
 159         { Opt_acdirmax, "acdirmax=%u" },
 160         { Opt_actimeo, "actimeo=%u" },
 161         { Opt_userspace, "retry=%u" },
 162         { Opt_namelen, "namlen=%u" },
 163         { Opt_mountport, "mountport=%u" },
 164         { Opt_mountprog, "mountprog=%u" },
 165         { Opt_mountvers, "mountvers=%u" },
 166         { Opt_nfsprog, "nfsprog=%u" },
 167         { Opt_nfsvers, "nfsvers=%u" },
 168         { Opt_nfsvers, "vers=%u" },
 169
 170         { Opt_sec, "sec=%s" },
 171         { Opt_proto, "proto=%s" },
 172         { Opt_mountproto, "mountproto=%s" },
 173         { Opt_addr, "addr=%s" },
 174         { Opt_clientaddr, "clientaddr=%s" },
 175         { Opt_mounthost, "mounthost=%s" },
 176
 177         { Opt_err, NULL }
 178 };
 179
 180 enum {
 181         Opt_xprt_udp, Opt_xprt_tcp,
 182
 183         Opt_xprt_err
 184 };
 185
 186 static match_table_t nfs_xprt_protocol_tokens = {
 187         { Opt_xprt_udp, "udp" },
 188         { Opt_xprt_tcp, "tcp" },
 189
 190         { Opt_xprt_err, NULL }
 191 };
 192
 193 enum {
 194         Opt_sec_none, Opt_sec_sys,
 195         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 196         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 197         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 198
 199         Opt_sec_err
 200 };
 201
 202 static match_table_t nfs_secflavor_tokens = {
 203         { Opt_sec_none, "none" },
 204         { Opt_sec_none, "null" },
 205         { Opt_sec_sys, "sys" },
 206
 207         { Opt_sec_krb5, "krb5" },
 208         { Opt_sec_krb5i, "krb5i" },
 209         { Opt_sec_krb5p, "krb5p" },
 210
 211         { Opt_sec_lkey, "lkey" },
 212         { Opt_sec_lkeyi, "lkeyi" },
 213         { Opt_sec_lkeyp, "lkeyp" },
 214
 215         { Opt_sec_err, NULL }
 216 };
 217
 218
 219 static void nfs_umount_begin(struct vfsmount *, int);
 220 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 221 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
 222 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
 223 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
 224 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
 225                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 226 static void nfs_kill_super(struct super_block *);
 227
 228 static struct file_system_type nfs_fs_type = {
 229         .owner          = THIS_MODULE,
 230         .name           = "nfs",
 231         .get_sb         = nfs_get_sb,
 232         .kill_sb        = nfs_kill_super,
 233         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 234 };
 235
 236 struct file_system_type nfs_xdev_fs_type = {
 237         .owner          = THIS_MODULE,
 238         .name           = "nfs",
 239         .get_sb         = nfs_xdev_get_sb,
 240         .kill_sb        = nfs_kill_super,
 241         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 242 };
 243
 244 static const struct super_operations nfs_sops = {
 245         .alloc_inode    = nfs_alloc_inode,
 246         .destroy_inode  = nfs_destroy_inode,
 247         .write_inode    = nfs_write_inode,
 248         .statfs         = nfs_statfs,
 249         .clear_inode    = nfs_clear_inode,
 250         .umount_begin   = nfs_umount_begin,
 251         .show_options   = nfs_show_options,
 252         .show_stats     = nfs_show_stats,
 253 };
 254
 255 #ifdef CONFIG_NFS_V4
 256 static int nfs4_get_sb(struct file_system_type *fs_type,
 257         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 258 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
 259         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 260 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 261         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 262 static void nfs4_kill_super(struct super_block *sb);
 263
 264 static struct file_system_type nfs4_fs_type = {
 265         .owner          = THIS_MODULE,
 266         .name           = "nfs4",
 267         .get_sb         = nfs4_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 struct file_system_type nfs4_xdev_fs_type = {
 273         .owner          = THIS_MODULE,
 274         .name           = "nfs4",
 275         .get_sb         = nfs4_xdev_get_sb,
 276         .kill_sb        = nfs4_kill_super,
 277         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 278 };
 279
 280 struct file_system_type nfs4_referral_fs_type = {
 281         .owner          = THIS_MODULE,
 282         .name           = "nfs4",
 283         .get_sb         = nfs4_referral_get_sb,
 284         .kill_sb        = nfs4_kill_super,
 285         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 286 };
 287
 288 static const struct super_operations nfs4_sops = {
 289         .alloc_inode    = nfs_alloc_inode,
 290         .destroy_inode  = nfs_destroy_inode,
 291         .write_inode    = nfs_write_inode,
 292         .statfs         = nfs_statfs,
 293         .clear_inode    = nfs4_clear_inode,
 294         .umount_begin   = nfs_umount_begin,
 295         .show_options   = nfs_show_options,
 296         .show_stats     = nfs_show_stats,
 297 };
 298 #endif
 299
 300 static struct shrinker *acl_shrinker;
 301
 302 /*
 303  * Register the NFS filesystems
 304  */
 305 int __init register_nfs_fs(void)
 306 {
 307         int ret;
 308
 309         ret = register_filesystem(&nfs_fs_type);
 310         if (ret < 0)
 311                 goto error_0;
 312
 313         ret = nfs_register_sysctl();
 314         if (ret < 0)
 315                 goto error_1;
 316 #ifdef CONFIG_NFS_V4
 317         ret = register_filesystem(&nfs4_fs_type);
 318         if (ret < 0)
 319                 goto error_2;
 320 #endif
 321         acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
 322         return 0;
 323
 324 #ifdef CONFIG_NFS_V4
 325 error_2:
 326         nfs_unregister_sysctl();
 327 #endif
 328 error_1:
 329         unregister_filesystem(&nfs_fs_type);
 330 error_0:
 331         return ret;
 332 }
 333
 334 /*
 335  * Unregister the NFS filesystems
 336  */
 337 void __exit unregister_nfs_fs(void)
 338 {
 339         if (acl_shrinker != NULL)
 340                 remove_shrinker(acl_shrinker);
 341 #ifdef CONFIG_NFS_V4
 342         unregister_filesystem(&nfs4_fs_type);
 343         nfs_unregister_sysctl();
 344 #endif
 345         unregister_filesystem(&nfs_fs_type);
 346 }
 347
 348 /*
 349  * Deliver file system statistics to userspace
 350  */
 351 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 352 {
 353         struct nfs_server *server = NFS_SB(dentry->d_sb);
 354         unsigned char blockbits;
 355         unsigned long blockres;
 356         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 357         struct nfs_fattr fattr;
 358         struct nfs_fsstat res = {
 359                         .fattr = &fattr,
 360         };
 361         int error;
 362
 363         lock_kernel();
 364
 365         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 366         if (error < 0)
 367                 goto out_err;
 368         buf->f_type = NFS_SUPER_MAGIC;
 369
 370         /*
 371          * Current versions of glibc do not correctly handle the
 372          * case where f_frsize != f_bsize.  Eventually we want to
 373          * report the value of wtmult in this field.
 374          */
 375         buf->f_frsize = dentry->d_sb->s_blocksize;
 376
 377         /*
 378          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 379          * are reported in units of f_frsize.  Linux hasn't had
 380          * an f_frsize field in its statfs struct until recently,
 381          * thus historically Linux's sys_statfs reports these
 382          * fields in units of f_bsize.
 383          */
 384         buf->f_bsize = dentry->d_sb->s_blocksize;
 385         blockbits = dentry->d_sb->s_blocksize_bits;
 386         blockres = (1 << blockbits) - 1;
 387         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 388         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 389         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 390
 391         buf->f_files = res.tfiles;
 392         buf->f_ffree = res.afiles;
 393
 394         buf->f_namelen = server->namelen;
 395
 396         unlock_kernel();
 397         return 0;
 398
 399  out_err:
 400         dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
 401         unlock_kernel();
 402         return error;
 403 }
 404
 405 /*
 406  * Map the security flavour number to a name
 407  */
 408 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 409 {
 410         static const struct {
 411                 rpc_authflavor_t flavour;
 412                 const char *str;
 413         } sec_flavours[] = {
 414                 { RPC_AUTH_NULL, "null" },
 415                 { RPC_AUTH_UNIX, "sys" },
 416                 { RPC_AUTH_GSS_KRB5, "krb5" },
 417                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 418                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 419                 { RPC_AUTH_GSS_LKEY, "lkey" },
 420                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 421                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 422                 { RPC_AUTH_GSS_SPKM, "spkm" },
 423                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 424                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 425                 { UINT_MAX, "unknown" }
 426         };
 427         int i;
 428
 429         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 430                 if (sec_flavours[i].flavour == flavour)
 431                         break;
 432         }
 433         return sec_flavours[i].str;
 434 }
 435
 436 /*
 437  * Describe the mount options in force on this server representation
 438  */
 439 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
 440 {
 441         static const struct proc_nfs_info {
 442                 int flag;
 443                 const char *str;
 444                 const char *nostr;
 445         } nfs_info[] = {
 446                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 447                 { NFS_MOUNT_INTR, ",intr", "" },
 448                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 449                 { NFS_MOUNT_NOAC, ",noac", "" },
 450                 { NFS_MOUNT_NONLM, ",nolock", "" },
 451                 { NFS_MOUNT_NOACL, ",noacl", "" },
 452                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 453                 { 0, NULL, NULL }
 454         };
 455         const struct proc_nfs_info *nfs_infop;
 456         struct nfs_client *clp = nfss->nfs_client;
 457         char buf[12];
 458         const char *proto;
 459
 460         seq_printf(m, ",vers=%d", clp->rpc_ops->version);
 461         seq_printf(m, ",rsize=%d", nfss->rsize);
 462         seq_printf(m, ",wsize=%d", nfss->wsize);
 463         if (nfss->acregmin != 3*HZ || showdefaults)
 464                 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
 465         if (nfss->acregmax != 60*HZ || showdefaults)
 466                 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
 467         if (nfss->acdirmin != 30*HZ || showdefaults)
 468                 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
 469         if (nfss->acdirmax != 60*HZ || showdefaults)
 470                 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
 471         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 472                 if (nfss->flags & nfs_infop->flag)
 473                         seq_puts(m, nfs_infop->str);
 474                 else
 475                         seq_puts(m, nfs_infop->nostr);
 476         }
 477         switch (nfss->client->cl_xprt->prot) {
 478                 case IPPROTO_TCP:
 479                         proto = "tcp";
 480                         break;
 481                 case IPPROTO_UDP:
 482                         proto = "udp";
 483                         break;
 484                 default:
 485                         snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
 486                         proto = buf;
 487         }
 488         seq_printf(m, ",proto=%s", proto);
 489         seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
 490         seq_printf(m, ",retrans=%u", clp->retrans_count);
 491         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 492 }
 493
 494 /*
 495  * Describe the mount options on this VFS mountpoint
 496  */
 497 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 498 {
 499         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 500
 501         nfs_show_mount_options(m, nfss, 0);
 502
 503         seq_puts(m, ",addr=");
 504         seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
 505
 506         return 0;
 507 }
 508
 509 /*
 510  * Present statistical information for this VFS mountpoint
 511  */
 512 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 513 {
 514         int i, cpu;
 515         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 516         struct rpc_auth *auth = nfss->client->cl_auth;
 517         struct nfs_iostats totals = { };
 518
 519         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 520
 521         /*
 522          * Display all mount option settings
 523          */
 524         seq_printf(m, "\n\topts:\t");
 525         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 526         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 527         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 528         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 529         nfs_show_mount_options(m, nfss, 1);
 530
 531         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 532
 533         seq_printf(m, "\n\tcaps:\t");
 534         seq_printf(m, "caps=0x%x", nfss->caps);
 535         seq_printf(m, ",wtmult=%d", nfss->wtmult);
 536         seq_printf(m, ",dtsize=%d", nfss->dtsize);
 537         seq_printf(m, ",bsize=%d", nfss->bsize);
 538         seq_printf(m, ",namelen=%d", nfss->namelen);
 539
 540 #ifdef CONFIG_NFS_V4
 541         if (nfss->nfs_client->cl_nfsversion == 4) {
 542                 seq_printf(m, "\n\tnfsv4:\t");
 543                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 544                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 545                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 546         }
 547 #endif
 548
 549         /*
 550          * Display security flavor in effect for this mount
 551          */
 552         seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
 553         if (auth->au_flavor)
 554                 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
 555
 556         /*
 557          * Display superblock I/O counters
 558          */
 559         for_each_possible_cpu(cpu) {
 560                 struct nfs_iostats *stats;
 561
 562                 preempt_disable();
 563                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 564
 565                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 566                         totals.events[i] += stats->events[i];
 567                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 568                         totals.bytes[i] += stats->bytes[i];
 569
 570                 preempt_enable();
 571         }
 572
 573         seq_printf(m, "\n\tevents:\t");
 574         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 575                 seq_printf(m, "%lu ", totals.events[i]);
 576         seq_printf(m, "\n\tbytes:\t");
 577         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 578                 seq_printf(m, "%Lu ", totals.bytes[i]);
 579         seq_printf(m, "\n");
 580
 581         rpc_print_iostats(m, nfss->client);
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * Begin unmount by attempting to remove all automounted mountpoints we added
 588  * in response to xdev traversals and referrals
 589  */
 590 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 591 {
 592         struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
 593         struct rpc_clnt *rpc;
 594
 595         shrink_submounts(vfsmnt, &nfs_automount_list);
 596
 597         if (!(flags & MNT_FORCE))
 598                 return;
 599         /* -EIO all pending I/O */
 600         rpc = server->client_acl;
 601         if (!IS_ERR(rpc))
 602                 rpc_killall_tasks(rpc);
 603         rpc = server->client;
 604         if (!IS_ERR(rpc))
 605                 rpc_killall_tasks(rpc);
 606 }
 607
 608 /*
 609  * Sanity-check a server address provided by the mount command
 610  */
 611 static int nfs_verify_server_address(struct sockaddr *addr)
 612 {
 613         switch (addr->sa_family) {
 614         case AF_INET: {
 615                 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
 616                 if (sa->sin_addr.s_addr != INADDR_ANY)
 617                         return 1;
 618                 break;
 619         }
 620         }
 621
 622         return 0;
 623 }
 624
 625 /*
 626  * Error-check and convert a string of mount options from user space into
 627  * a data structure
 628  */
 629 static int nfs_parse_mount_options(char *raw,
 630                                    struct nfs_parsed_mount_data *mnt)
 631 {
 632         char *p, *string;
 633
 634         if (!raw) {
 635                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 636                 return 1;
 637         }
 638         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 639
 640         while ((p = strsep(&raw, ",")) != NULL) {
 641                 substring_t args[MAX_OPT_ARGS];
 642                 int option, token;
 643
 644                 if (!*p)
 645                         continue;
 646
 647                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 648
 649                 token = match_token(p, nfs_mount_option_tokens, args);
 650                 switch (token) {
 651                 case Opt_soft:
 652                         mnt->flags |= NFS_MOUNT_SOFT;
 653                         break;
 654                 case Opt_hard:
 655                         mnt->flags &= ~NFS_MOUNT_SOFT;
 656                         break;
 657                 case Opt_intr:
 658                         mnt->flags |= NFS_MOUNT_INTR;
 659                         break;
 660                 case Opt_nointr:
 661                         mnt->flags &= ~NFS_MOUNT_INTR;
 662                         break;
 663                 case Opt_posix:
 664                         mnt->flags |= NFS_MOUNT_POSIX;
 665                         break;
 666                 case Opt_noposix:
 667                         mnt->flags &= ~NFS_MOUNT_POSIX;
 668                         break;
 669                 case Opt_cto:
 670                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 671                         break;
 672                 case Opt_nocto:
 673                         mnt->flags |= NFS_MOUNT_NOCTO;
 674                         break;
 675                 case Opt_ac:
 676                         mnt->flags &= ~NFS_MOUNT_NOAC;
 677                         break;
 678                 case Opt_noac:
 679                         mnt->flags |= NFS_MOUNT_NOAC;
 680                         break;
 681                 case Opt_lock:
 682                         mnt->flags &= ~NFS_MOUNT_NONLM;
 683                         break;
 684                 case Opt_nolock:
 685                         mnt->flags |= NFS_MOUNT_NONLM;
 686                         break;
 687                 case Opt_v2:
 688                         mnt->flags &= ~NFS_MOUNT_VER3;
 689                         break;
 690                 case Opt_v3:
 691                         mnt->flags |= NFS_MOUNT_VER3;
 692                         break;
 693                 case Opt_udp:
 694                         mnt->flags &= ~NFS_MOUNT_TCP;
 695                         mnt->nfs_server.protocol = IPPROTO_UDP;
 696                         mnt->timeo = 7;
 697                         mnt->retrans = 5;
 698                         break;
 699                 case Opt_tcp:
 700                         mnt->flags |= NFS_MOUNT_TCP;
 701                         mnt->nfs_server.protocol = IPPROTO_TCP;
 702                         mnt->timeo = 600;
 703                         mnt->retrans = 2;
 704                         break;
 705                 case Opt_acl:
 706                         mnt->flags &= ~NFS_MOUNT_NOACL;
 707                         break;
 708                 case Opt_noacl:
 709                         mnt->flags |= NFS_MOUNT_NOACL;
 710                         break;
 711                 case Opt_rdirplus:
 712                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 713                         break;
 714                 case Opt_nordirplus:
 715                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 716                         break;
 717
 718                 case Opt_port:
 719                         if (match_int(args, &option))
 720                                 return 0;
 721                         if (option < 0 || option > 65535)
 722                                 return 0;
 723                         mnt->nfs_server.address.sin_port = htonl(option);
 724                         break;
 725                 case Opt_rsize:
 726                         if (match_int(args, &mnt->rsize))
 727                                 return 0;
 728                         break;
 729                 case Opt_wsize:
 730                         if (match_int(args, &mnt->wsize))
 731                                 return 0;
 732                         break;
 733                 case Opt_bsize:
 734                         if (match_int(args, &option))
 735                                 return 0;
 736                         if (option < 0)
 737                                 return 0;
 738                         mnt->bsize = option;
 739                         break;
 740                 case Opt_timeo:
 741                         if (match_int(args, &mnt->timeo))
 742                                 return 0;
 743                         break;
 744                 case Opt_retrans:
 745                         if (match_int(args, &mnt->retrans))
 746                                 return 0;
 747                         break;
 748                 case Opt_acregmin:
 749                         if (match_int(args, &mnt->acregmin))
 750                                 return 0;
 751                         break;
 752                 case Opt_acregmax:
 753                         if (match_int(args, &mnt->acregmax))
 754                                 return 0;
 755                         break;
 756                 case Opt_acdirmin:
 757                         if (match_int(args, &mnt->acdirmin))
 758                                 return 0;
 759                         break;
 760                 case Opt_acdirmax:
 761                         if (match_int(args, &mnt->acdirmax))
 762                                 return 0;
 763                         break;
 764                 case Opt_actimeo:
 765                         if (match_int(args, &option))
 766                                 return 0;
 767                         if (option < 0)
 768                                 return 0;
 769                         mnt->acregmin =
 770                         mnt->acregmax =
 771                         mnt->acdirmin =
 772                         mnt->acdirmax = option;
 773                         break;
 774                 case Opt_namelen:
 775                         if (match_int(args, &mnt->namlen))
 776                                 return 0;
 777                         break;
 778                 case Opt_mountport:
 779                         if (match_int(args, &option))
 780                                 return 0;
 781                         if (option < 0 || option > 65535)
 782                                 return 0;
 783                         mnt->mount_server.port = option;
 784                         break;
 785                 case Opt_mountprog:
 786                         if (match_int(args, &option))
 787                                 return 0;
 788                         if (option < 0)
 789                                 return 0;
 790                         mnt->mount_server.program = option;
 791                         break;
 792                 case Opt_mountvers:
 793                         if (match_int(args, &option))
 794                                 return 0;
 795                         if (option < 0)
 796                                 return 0;
 797                         mnt->mount_server.version = option;
 798                         break;
 799                 case Opt_nfsprog:
 800                         if (match_int(args, &option))
 801                                 return 0;
 802                         if (option < 0)
 803                                 return 0;
 804                         mnt->nfs_server.program = option;
 805                         break;
 806                 case Opt_nfsvers:
 807                         if (match_int(args, &option))
 808                                 return 0;
 809                         switch (option) {
 810                         case 2:
 811                                 mnt->flags &= ~NFS_MOUNT_VER3;
 812                                 break;
 813                         case 3:
 814                                 mnt->flags |= NFS_MOUNT_VER3;
 815                                 break;
 816                         default:
 817                                 goto out_unrec_vers;
 818                         }
 819                         break;
 820
 821                 case Opt_sec:
 822                         string = match_strdup(args);
 823                         if (string == NULL)
 824                                 goto out_nomem;
 825                         token = match_token(string, nfs_secflavor_tokens, args);
 826                         kfree(string);
 827
 828                         /*
 829                          * The flags setting is for v2/v3.  The flavor_len
 830                          * setting is for v4.  v2/v3 also need to know the
 831                          * difference between NULL and UNIX.
 832                          */
 833                         switch (token) {
 834                         case Opt_sec_none:
 835                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 836                                 mnt->auth_flavor_len = 0;
 837                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 838                                 break;
 839                         case Opt_sec_sys:
 840                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 841                                 mnt->auth_flavor_len = 0;
 842                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 843                                 break;
 844                         case Opt_sec_krb5:
 845                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 846                                 mnt->auth_flavor_len = 1;
 847                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 848                                 break;
 849                         case Opt_sec_krb5i:
 850                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 851                                 mnt->auth_flavor_len = 1;
 852                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 853                                 break;
 854                         case Opt_sec_krb5p:
 855                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 856                                 mnt->auth_flavor_len = 1;
 857                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 858                                 break;
 859                         case Opt_sec_lkey:
 860                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 861                                 mnt->auth_flavor_len = 1;
 862                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 863                                 break;
 864                         case Opt_sec_lkeyi:
 865                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 866                                 mnt->auth_flavor_len = 1;
 867                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 868                                 break;
 869                         case Opt_sec_lkeyp:
 870                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 871                                 mnt->auth_flavor_len = 1;
 872                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
 873                                 break;
 874                         case Opt_sec_spkm:
 875                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 876                                 mnt->auth_flavor_len = 1;
 877                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
 878                                 break;
 879                         case Opt_sec_spkmi:
 880                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 881                                 mnt->auth_flavor_len = 1;
 882                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
 883                                 break;
 884                         case Opt_sec_spkmp:
 885                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 886                                 mnt->auth_flavor_len = 1;
 887                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
 888                                 break;
 889                         default:
 890                                 goto out_unrec_sec;
 891                         }
 892                         break;
 893                 case Opt_proto:
 894                         string = match_strdup(args);
 895                         if (string == NULL)
 896                                 goto out_nomem;
 897                         token = match_token(string,
 898                                             nfs_xprt_protocol_tokens, args);
 899                         kfree(string);
 900
 901                         switch (token) {
 902                         case Opt_udp:
 903                                 mnt->flags &= ~NFS_MOUNT_TCP;
 904                                 mnt->nfs_server.protocol = IPPROTO_UDP;
 905                                 mnt->timeo = 7;
 906                                 mnt->retrans = 5;
 907                                 break;
 908                         case Opt_tcp:
 909                                 mnt->flags |= NFS_MOUNT_TCP;
 910                                 mnt->nfs_server.protocol = IPPROTO_TCP;
 911                                 mnt->timeo = 600;
 912                                 mnt->retrans = 2;
 913                                 break;
 914                         default:
 915                                 goto out_unrec_xprt;
 916                         }
 917                         break;
 918                 case Opt_mountproto:
 919                         string = match_strdup(args);
 920                         if (string == NULL)
 921                                 goto out_nomem;
 922                         token = match_token(string,
 923                                             nfs_xprt_protocol_tokens, args);
 924                         kfree(string);
 925
 926                         switch (token) {
 927                         case Opt_udp:
 928                                 mnt->mount_server.protocol = IPPROTO_UDP;
 929                                 break;
 930                         case Opt_tcp:
 931                                 mnt->mount_server.protocol = IPPROTO_TCP;
 932                                 break;
 933                         default:
 934                                 goto out_unrec_xprt;
 935                         }
 936                         break;
 937                 case Opt_addr:
 938                         string = match_strdup(args);
 939                         if (string == NULL)
 940                                 goto out_nomem;
 941                         mnt->nfs_server.address.sin_family = AF_INET;
 942                         mnt->nfs_server.address.sin_addr.s_addr =
 943                                                         in_aton(string);
 944                         kfree(string);
 945                         break;
 946                 case Opt_clientaddr:
 947                         string = match_strdup(args);
 948                         if (string == NULL)
 949                                 goto out_nomem;
 950                         mnt->client_address = string;
 951                         break;
 952                 case Opt_mounthost:
 953                         string = match_strdup(args);
 954                         if (string == NULL)
 955                                 goto out_nomem;
 956                         mnt->mount_server.address.sin_family = AF_INET;
 957                         mnt->mount_server.address.sin_addr.s_addr =
 958                                                         in_aton(string);
 959                         kfree(string);
 960                         break;
 961
 962                 case Opt_userspace:
 963                 case Opt_deprecated:
 964                         break;
 965
 966                 default:
 967                         goto out_unknown;
 968                 }
 969         }
 970
 971         return 1;
 972
 973 out_nomem:
 974         printk(KERN_INFO "NFS: not enough memory to parse option\n");
 975         return 0;
 976
 977 out_unrec_vers:
 978         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
 979         return 0;
 980
 981 out_unrec_xprt:
 982         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
 983         return 0;
 984
 985 out_unrec_sec:
 986         printk(KERN_INFO "NFS: unrecognized security flavor\n");
 987         return 0;
 988
 989 out_unknown:
 990         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
 991         return 0;
 992 }
 993
 994 /*
 995  * Use the remote server's MOUNT service to request the NFS file handle
 996  * corresponding to the provided path.
 997  */
 998 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
 999                          struct nfs_fh *root_fh)
1000 {
1001         struct sockaddr_in sin;
1002         int status;
1003
1004         if (args->mount_server.version == 0) {
1005                 if (args->flags & NFS_MOUNT_VER3)
1006                         args->mount_server.version = NFS_MNT3_VERSION;
1007                 else
1008                         args->mount_server.version = NFS_MNT_VERSION;
1009         }
1010
1011         /*
1012          * Construct the mount server's address.
1013          */
1014         if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1015                 sin = args->mount_server.address;
1016         else
1017                 sin = args->nfs_server.address;
1018         if (args->mount_server.port == 0) {
1019                 status = rpcb_getport_sync(&sin,
1020                                            args->mount_server.program,
1021                                            args->mount_server.version,
1022                                            args->mount_server.protocol);
1023                 if (status < 0)
1024                         goto out_err;
1025                 sin.sin_port = htons(status);
1026         } else
1027                 sin.sin_port = htons(args->mount_server.port);
1028
1029         /*
1030          * Now ask the mount server to map our export path
1031          * to a file handle.
1032          */
1033         status = nfs_mount((struct sockaddr *) &sin,
1034                            sizeof(sin),
1035                            args->nfs_server.hostname,
1036                            args->nfs_server.export_path,
1037                            args->mount_server.version,
1038                            args->mount_server.protocol,
1039                            root_fh);
1040         if (status < 0)
1041                 goto out_err;
1042
1043         return status;
1044
1045 out_err:
1046         dfprintk(MOUNT, "NFS: unable to contact server on host "
1047                  NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr));
1048         return status;
1049 }
1050
1051 /*
1052  * Validate the NFS2/NFS3 mount data
1053  * - fills in the mount root filehandle
1054  */
1055 static int nfs_validate_mount_data(struct nfs_mount_data *data,
1056                                    struct nfs_fh *mntfh)
1057 {
1058         if (data == NULL)
1059                 goto out_no_data;
1060
1061         switch (data->version) {
1062         case 1:
1063                 data->namlen = 0;
1064         case 2:
1065                 data->bsize = 0;
1066         case 3:
1067                 if (data->flags & NFS_MOUNT_VER3)
1068                         goto out_no_v3;
1069                 data->root.size = NFS2_FHSIZE;
1070                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1071         case 4:
1072                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1073                         goto out_no_sec;
1074         case 5:
1075                 memset(data->context, 0, sizeof(data->context));
1076         case 6:
1077                 if (data->flags & NFS_MOUNT_VER3)
1078                         mntfh->size = data->root.size;
1079                 else
1080                         mntfh->size = NFS2_FHSIZE;
1081
1082                 if (mntfh->size > sizeof(mntfh->data))
1083                         goto out_invalid_fh;
1084
1085                 memcpy(mntfh->data, data->root.data, mntfh->size);
1086                 if (mntfh->size < sizeof(mntfh->data))
1087                         memset(mntfh->data + mntfh->size, 0,
1088                                sizeof(mntfh->data) - mntfh->size);
1089                 break;
1090         default:
1091                 goto out_bad_version;
1092         }
1093
1094         if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
1095                 data->pseudoflavor = RPC_AUTH_UNIX;
1096
1097 #ifndef CONFIG_NFS_V3
1098         if (data->flags & NFS_MOUNT_VER3)
1099                 goto out_v3_not_compiled;
1100 #endif /* !CONFIG_NFS_V3 */
1101
1102         if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1103                 goto out_no_address;
1104
1105         return 0;
1106
1107 out_no_data:
1108         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1109         return -EINVAL;
1110
1111 out_no_v3:
1112         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1113                  data->version);
1114         return -EINVAL;
1115
1116 out_no_sec:
1117         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1118         return -EINVAL;
1119
1120 out_bad_version:
1121         dfprintk(MOUNT, "NFS: bad nfs_mount_data version %d\n",
1122                  data->version);
1123         return -EINVAL;
1124
1125 #ifndef CONFIG_NFS_V3
1126 out_v3_not_compiled:
1127         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1128         return -EPROTONOSUPPORT;
1129 #endif /* !CONFIG_NFS_V3 */
1130
1131 out_no_address:
1132         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1133         return -EINVAL;
1134
1135 out_invalid_fh:
1136         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1137         return -EINVAL;
1138 }
1139
1140 /*
1141  * Initialise the common bits of the superblock
1142  */
1143 static inline void nfs_initialise_sb(struct super_block *sb)
1144 {
1145         struct nfs_server *server = NFS_SB(sb);
1146
1147         sb->s_magic = NFS_SUPER_MAGIC;
1148
1149         /* We probably want something more informative here */
1150         snprintf(sb->s_id, sizeof(sb->s_id),
1151                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1152
1153         if (sb->s_blocksize == 0)
1154                 sb->s_blocksize = nfs_block_bits(server->wsize,
1155                                                  &sb->s_blocksize_bits);
1156
1157         if (server->flags & NFS_MOUNT_NOAC)
1158                 sb->s_flags |= MS_SYNCHRONOUS;
1159
1160         nfs_super_set_maxbytes(sb, server->maxfilesize);
1161 }
1162
1163 /*
1164  * Finish setting up an NFS2/3 superblock
1165  */
1166 static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
1167 {
1168         struct nfs_server *server = NFS_SB(sb);
1169
1170         sb->s_blocksize_bits = 0;
1171         sb->s_blocksize = 0;
1172         if (data->bsize)
1173                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1174
1175         if (server->flags & NFS_MOUNT_VER3) {
1176                 /* The VFS shouldn't apply the umask to mode bits. We will do
1177                  * so ourselves when necessary.
1178                  */
1179                 sb->s_flags |= MS_POSIXACL;
1180                 sb->s_time_gran = 1;
1181         }
1182
1183         sb->s_op = &nfs_sops;
1184         nfs_initialise_sb(sb);
1185 }
1186
1187 /*
1188  * Finish setting up a cloned NFS2/3 superblock
1189  */
1190 static void nfs_clone_super(struct super_block *sb,
1191                             const struct super_block *old_sb)
1192 {
1193         struct nfs_server *server = NFS_SB(sb);
1194
1195         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1196         sb->s_blocksize = old_sb->s_blocksize;
1197         sb->s_maxbytes = old_sb->s_maxbytes;
1198
1199         if (server->flags & NFS_MOUNT_VER3) {
1200                 /* The VFS shouldn't apply the umask to mode bits. We will do
1201                  * so ourselves when necessary.
1202                  */
1203                 sb->s_flags |= MS_POSIXACL;
1204                 sb->s_time_gran = 1;
1205         }
1206
1207         sb->s_op = old_sb->s_op;
1208         nfs_initialise_sb(sb);
1209 }
1210
1211 static int nfs_set_super(struct super_block *s, void *_server)
1212 {
1213         struct nfs_server *server = _server;
1214         int ret;
1215
1216         s->s_fs_info = server;
1217         ret = set_anon_super(s, server);
1218         if (ret == 0)
1219                 server->s_dev = s->s_dev;
1220         return ret;
1221 }
1222
1223 static int nfs_compare_super(struct super_block *sb, void *data)
1224 {
1225         struct nfs_server *server = data, *old = NFS_SB(sb);
1226
1227         if (old->nfs_client != server->nfs_client)
1228                 return 0;
1229         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1230                 return 0;
1231         return 1;
1232 }
1233
1234 static int nfs_get_sb(struct file_system_type *fs_type,
1235         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1236 {
1237         struct nfs_server *server = NULL;
1238         struct super_block *s;
1239         struct nfs_fh mntfh;
1240         struct nfs_mount_data *data = raw_data;
1241         struct dentry *mntroot;
1242         int error;
1243
1244         /* Validate the mount data */
1245         error = nfs_validate_mount_data(data, &mntfh);
1246         if (error < 0)
1247                 goto out;
1248
1249         /* Get a volume representation */
1250         server = nfs_create_server(data, &mntfh);
1251         if (IS_ERR(server)) {
1252                 error = PTR_ERR(server);
1253                 goto out;
1254         }
1255
1256         /* Get a superblock - note that we may end up sharing one that already exists */
1257         s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1258         if (IS_ERR(s)) {
1259                 error = PTR_ERR(s);
1260                 goto out_err_nosb;
1261         }
1262
1263         if (s->s_fs_info != server) {
1264                 nfs_free_server(server);
1265                 server = NULL;
1266         }
1267
1268         if (!s->s_root) {
1269                 /* initial superblock/root creation */
1270                 s->s_flags = flags;
1271                 nfs_fill_super(s, data);
1272         }
1273
1274         mntroot = nfs_get_root(s, &mntfh);
1275         if (IS_ERR(mntroot)) {
1276                 error = PTR_ERR(mntroot);
1277                 goto error_splat_super;
1278         }
1279
1280         s->s_flags |= MS_ACTIVE;
1281         mnt->mnt_sb = s;
1282         mnt->mnt_root = mntroot;
1283         error = 0;
1284
1285 out:
1286         return error;
1287
1288 out_err_nosb:
1289         nfs_free_server(server);
1290         goto out;
1291
1292 error_splat_super:
1293         up_write(&s->s_umount);
1294         deactivate_super(s);
1295         goto out;
1296 }
1297
1298 /*
1299  * Destroy an NFS2/3 superblock
1300  */
1301 static void nfs_kill_super(struct super_block *s)
1302 {
1303         struct nfs_server *server = NFS_SB(s);
1304
1305         kill_anon_super(s);
1306         nfs_free_server(server);
1307 }
1308
1309 /*
1310  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1311  */
1312 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1313                            const char *dev_name, void *raw_data,
1314                            struct vfsmount *mnt)
1315 {
1316         struct nfs_clone_mount *data = raw_data;
1317         struct super_block *s;
1318         struct nfs_server *server;
1319         struct dentry *mntroot;
1320         int error;
1321
1322         dprintk("--> nfs_xdev_get_sb()\n");
1323
1324         /* create a new volume representation */
1325         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1326         if (IS_ERR(server)) {
1327                 error = PTR_ERR(server);
1328                 goto out_err_noserver;
1329         }
1330
1331         /* Get a superblock - note that we may end up sharing one that already exists */
1332         s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1333         if (IS_ERR(s)) {
1334                 error = PTR_ERR(s);
1335                 goto out_err_nosb;
1336         }
1337
1338         if (s->s_fs_info != server) {
1339                 nfs_free_server(server);
1340                 server = NULL;
1341         }
1342
1343         if (!s->s_root) {
1344                 /* initial superblock/root creation */
1345                 s->s_flags = flags;
1346                 nfs_clone_super(s, data->sb);
1347         }
1348
1349         mntroot = nfs_get_root(s, data->fh);
1350         if (IS_ERR(mntroot)) {
1351                 error = PTR_ERR(mntroot);
1352                 goto error_splat_super;
1353         }
1354
1355         s->s_flags |= MS_ACTIVE;
1356         mnt->mnt_sb = s;
1357         mnt->mnt_root = mntroot;
1358
1359         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1360         return 0;
1361
1362 out_err_nosb:
1363         nfs_free_server(server);
1364 out_err_noserver:
1365         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1366         return error;
1367
1368 error_splat_super:
1369         up_write(&s->s_umount);
1370         deactivate_super(s);
1371         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1372         return error;
1373 }
1374
1375 #ifdef CONFIG_NFS_V4
1376
1377 /*
1378  * Finish setting up a cloned NFS4 superblock
1379  */
1380 static void nfs4_clone_super(struct super_block *sb,
1381                             const struct super_block *old_sb)
1382 {
1383         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1384         sb->s_blocksize = old_sb->s_blocksize;
1385         sb->s_maxbytes = old_sb->s_maxbytes;
1386         sb->s_time_gran = 1;
1387         sb->s_op = old_sb->s_op;
1388         nfs_initialise_sb(sb);
1389 }
1390
1391 /*
1392  * Set up an NFS4 superblock
1393  */
1394 static void nfs4_fill_super(struct super_block *sb)
1395 {
1396         sb->s_time_gran = 1;
1397         sb->s_op = &nfs4_sops;
1398         nfs_initialise_sb(sb);
1399 }
1400
1401 /*
1402  * Validate NFSv4 mount options
1403  */
1404 static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
1405                                     const char *dev_name,
1406                                     struct sockaddr_in *addr,
1407                                     rpc_authflavor_t *authflavour,
1408                                     char **hostname,
1409                                     char **mntpath,
1410                                     char **ip_addr)
1411 {
1412         struct nfs4_mount_data *data = *options;
1413         char *c;
1414
1415         if (data == NULL)
1416                 goto out_no_data;
1417
1418         switch (data->version) {
1419         case 1:
1420                 if (data->host_addrlen != sizeof(*addr))
1421                         goto out_no_address;
1422                 if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
1423                         return -EFAULT;
1424                 if (addr->sin_port == 0)
1425                         addr->sin_port = htons(NFS_PORT);
1426                 if (!nfs_verify_server_address((struct sockaddr *) addr))
1427                         goto out_no_address;
1428
1429                 switch (data->auth_flavourlen) {
1430                 case 0:
1431                         *authflavour = RPC_AUTH_UNIX;
1432                         break;
1433                 case 1:
1434                         if (copy_from_user(authflavour, data->auth_flavours,
1435                                            sizeof(*authflavour)))
1436                                 return -EFAULT;
1437                         break;
1438                 default:
1439                         goto out_inval_auth;
1440                 }
1441
1442                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1443                 if (IS_ERR(c))
1444                         return PTR_ERR(c);
1445                 *hostname = c;
1446
1447                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1448                 if (IS_ERR(c))
1449                         return PTR_ERR(c);
1450                 *mntpath = c;
1451                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
1452
1453                 c = strndup_user(data->client_addr.data, 16);
1454                 if (IS_ERR(c))
1455                         return PTR_ERR(c);
1456                 *ip_addr = c;
1457
1458                 break;
1459         default:
1460                 goto out_bad_version;
1461         }
1462
1463         return 0;
1464
1465 out_no_data:
1466         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1467         return -EINVAL;
1468
1469 out_inval_auth:
1470         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1471                  data->auth_flavourlen);
1472         return -EINVAL;
1473
1474 out_no_address:
1475         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1476         return -EINVAL;
1477
1478 out_bad_version:
1479         dfprintk(MOUNT, "NFS4: bad nfs_mount_data version %d\n",
1480                  data->version);
1481         return -EINVAL;
1482 }
1483
1484 /*
1485  * Get the superblock for an NFS4 mountpoint
1486  */
1487 static int nfs4_get_sb(struct file_system_type *fs_type,
1488         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1489 {
1490         struct nfs4_mount_data *data = raw_data;
1491         struct super_block *s;
1492         struct nfs_server *server;
1493         struct sockaddr_in addr;
1494         rpc_authflavor_t authflavour;
1495         struct nfs_fh mntfh;
1496         struct dentry *mntroot;
1497         char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
1498         int error;
1499
1500         /* Validate the mount data */
1501         error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
1502                                          &hostname, &mntpath, &ip_addr);
1503         if (error < 0)
1504                 goto out;
1505
1506         /* Get a volume representation */
1507         server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
1508                                     authflavour, &mntfh);
1509         if (IS_ERR(server)) {
1510                 error = PTR_ERR(server);
1511                 goto out;
1512         }
1513
1514         /* Get a superblock - note that we may end up sharing one that already exists */
1515         s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1516         if (IS_ERR(s)) {
1517                 error = PTR_ERR(s);
1518                 goto out_free;
1519         }
1520
1521         if (s->s_fs_info != server) {
1522                 nfs_free_server(server);
1523                 server = NULL;
1524         }
1525
1526         if (!s->s_root) {
1527                 /* initial superblock/root creation */
1528                 s->s_flags = flags;
1529                 nfs4_fill_super(s);
1530         }
1531
1532         mntroot = nfs4_get_root(s, &mntfh);
1533         if (IS_ERR(mntroot)) {
1534                 error = PTR_ERR(mntroot);
1535                 goto error_splat_super;
1536         }
1537
1538         s->s_flags |= MS_ACTIVE;
1539         mnt->mnt_sb = s;
1540         mnt->mnt_root = mntroot;
1541         error = 0;
1542
1543 out:
1544         kfree(ip_addr);
1545         kfree(mntpath);
1546         kfree(hostname);
1547         return error;
1548
1549 out_free:
1550         nfs_free_server(server);
1551         goto out;
1552
1553 error_splat_super:
1554         up_write(&s->s_umount);
1555         deactivate_super(s);
1556         goto out;
1557 }
1558
1559 static void nfs4_kill_super(struct super_block *sb)
1560 {
1561         struct nfs_server *server = NFS_SB(sb);
1562
1563         nfs_return_all_delegations(sb);
1564         kill_anon_super(sb);
1565
1566         nfs4_renewd_prepare_shutdown(server);
1567         nfs_free_server(server);
1568 }
1569
1570 /*
1571  * Clone an NFS4 server record on xdev traversal (FSID-change)
1572  */
1573 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1574                             const char *dev_name, void *raw_data,
1575                             struct vfsmount *mnt)
1576 {
1577         struct nfs_clone_mount *data = raw_data;
1578         struct super_block *s;
1579         struct nfs_server *server;
1580         struct dentry *mntroot;
1581         int error;
1582
1583         dprintk("--> nfs4_xdev_get_sb()\n");
1584
1585         /* create a new volume representation */
1586         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1587         if (IS_ERR(server)) {
1588                 error = PTR_ERR(server);
1589                 goto out_err_noserver;
1590         }
1591
1592         /* Get a superblock - note that we may end up sharing one that already exists */
1593         s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1594         if (IS_ERR(s)) {
1595                 error = PTR_ERR(s);
1596                 goto out_err_nosb;
1597         }
1598
1599         if (s->s_fs_info != server) {
1600                 nfs_free_server(server);
1601                 server = NULL;
1602         }
1603
1604         if (!s->s_root) {
1605                 /* initial superblock/root creation */
1606                 s->s_flags = flags;
1607                 nfs4_clone_super(s, data->sb);
1608         }
1609
1610         mntroot = nfs4_get_root(s, data->fh);
1611         if (IS_ERR(mntroot)) {
1612                 error = PTR_ERR(mntroot);
1613                 goto error_splat_super;
1614         }
1615
1616         s->s_flags |= MS_ACTIVE;
1617         mnt->mnt_sb = s;
1618         mnt->mnt_root = mntroot;
1619
1620         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1621         return 0;
1622
1623 out_err_nosb:
1624         nfs_free_server(server);
1625 out_err_noserver:
1626         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1627         return error;
1628
1629 error_splat_super:
1630         up_write(&s->s_umount);
1631         deactivate_super(s);
1632         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1633         return error;
1634 }
1635
1636 /*
1637  * Create an NFS4 server record on referral traversal
1638  */
1639 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1640                                 const char *dev_name, void *raw_data,
1641                                 struct vfsmount *mnt)
1642 {
1643         struct nfs_clone_mount *data = raw_data;
1644         struct super_block *s;
1645         struct nfs_server *server;
1646         struct dentry *mntroot;
1647         struct nfs_fh mntfh;
1648         int error;
1649
1650         dprintk("--> nfs4_referral_get_sb()\n");
1651
1652         /* create a new volume representation */
1653         server = nfs4_create_referral_server(data, &mntfh);
1654         if (IS_ERR(server)) {
1655                 error = PTR_ERR(server);
1656                 goto out_err_noserver;
1657         }
1658
1659         /* Get a superblock - note that we may end up sharing one that already exists */
1660         s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1661         if (IS_ERR(s)) {
1662                 error = PTR_ERR(s);
1663                 goto out_err_nosb;
1664         }
1665
1666         if (s->s_fs_info != server) {
1667                 nfs_free_server(server);
1668                 server = NULL;
1669         }
1670
1671         if (!s->s_root) {
1672                 /* initial superblock/root creation */
1673                 s->s_flags = flags;
1674                 nfs4_fill_super(s);
1675         }
1676
1677         mntroot = nfs4_get_root(s, &mntfh);
1678         if (IS_ERR(mntroot)) {
1679                 error = PTR_ERR(mntroot);
1680                 goto error_splat_super;
1681         }
1682
1683         s->s_flags |= MS_ACTIVE;
1684         mnt->mnt_sb = s;
1685         mnt->mnt_root = mntroot;
1686
1687         dprintk("<-- nfs4_referral_get_sb() = 0\n");
1688         return 0;
1689
1690 out_err_nosb:
1691         nfs_free_server(server);
1692 out_err_noserver:
1693         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1694         return error;
1695
1696 error_splat_super:
1697         up_write(&s->s_umount);
1698         deactivate_super(s);
1699         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1700         return error;
1701 }
1702
1703 #endif /* CONFIG_NFS_V4 */