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_userspace, "retry=%s" },
 105
 106         { Opt_soft, "soft" },
 107         { Opt_hard, "hard" },
 108         { Opt_intr, "intr" },
 109         { Opt_nointr, "nointr" },
 110         { Opt_posix, "posix" },
 111         { Opt_noposix, "noposix" },
 112         { Opt_cto, "cto" },
 113         { Opt_nocto, "nocto" },
 114         { Opt_ac, "ac" },
 115         { Opt_noac, "noac" },
 116         { Opt_lock, "lock" },
 117         { Opt_nolock, "nolock" },
 118         { Opt_v2, "v2" },
 119         { Opt_v3, "v3" },
 120         { Opt_udp, "udp" },
 121         { Opt_tcp, "tcp" },
 122         { Opt_rdma, "rdma" },
 123         { Opt_acl, "acl" },
 124         { Opt_noacl, "noacl" },
 125         { Opt_rdirplus, "rdirplus" },
 126         { Opt_nordirplus, "nordirplus" },
 127         { Opt_sharecache, "sharecache" },
 128         { Opt_nosharecache, "nosharecache" },
 129
 130         { Opt_port, "port=%u" },
 131         { Opt_rsize, "rsize=%u" },
 132         { Opt_wsize, "wsize=%u" },
 133         { Opt_bsize, "bsize=%u" },
 134         { Opt_timeo, "timeo=%u" },
 135         { Opt_retrans, "retrans=%u" },
 136         { Opt_acregmin, "acregmin=%u" },
 137         { Opt_acregmax, "acregmax=%u" },
 138         { Opt_acdirmin, "acdirmin=%u" },
 139         { Opt_acdirmax, "acdirmax=%u" },
 140         { Opt_actimeo, "actimeo=%u" },
 141         { Opt_namelen, "namlen=%u" },
 142         { Opt_mountport, "mountport=%u" },
 143         { Opt_mountvers, "mountvers=%u" },
 144         { Opt_nfsvers, "nfsvers=%u" },
 145         { Opt_nfsvers, "vers=%u" },
 146
 147         { Opt_sec, "sec=%s" },
 148         { Opt_proto, "proto=%s" },
 149         { Opt_mountproto, "mountproto=%s" },
 150         { Opt_addr, "addr=%s" },
 151         { Opt_clientaddr, "clientaddr=%s" },
 152         { Opt_mounthost, "mounthost=%s" },
 153         { Opt_mountaddr, "mountaddr=%s" },
 154
 155         { Opt_err, NULL }
 156 };
 157
 158 enum {
 159         Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 160
 161         Opt_xprt_err
 162 };
 163
 164 static match_table_t nfs_xprt_protocol_tokens = {
 165         { Opt_xprt_udp, "udp" },
 166         { Opt_xprt_tcp, "tcp" },
 167         { Opt_xprt_rdma, "rdma" },
 168
 169         { Opt_xprt_err, NULL }
 170 };
 171
 172 enum {
 173         Opt_sec_none, Opt_sec_sys,
 174         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 175         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 176         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 177
 178         Opt_sec_err
 179 };
 180
 181 static match_table_t nfs_secflavor_tokens = {
 182         { Opt_sec_none, "none" },
 183         { Opt_sec_none, "null" },
 184         { Opt_sec_sys, "sys" },
 185
 186         { Opt_sec_krb5, "krb5" },
 187         { Opt_sec_krb5i, "krb5i" },
 188         { Opt_sec_krb5p, "krb5p" },
 189
 190         { Opt_sec_lkey, "lkey" },
 191         { Opt_sec_lkeyi, "lkeyi" },
 192         { Opt_sec_lkeyp, "lkeyp" },
 193
 194         { Opt_sec_spkm, "spkm3" },
 195         { Opt_sec_spkmi, "spkm3i" },
 196         { Opt_sec_spkmp, "spkm3p" },
 197
 198         { Opt_sec_err, NULL }
 199 };
 200
 201
 202 static void nfs_umount_begin(struct super_block *);
 203 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 204 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
 205 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
 206 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
 207 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
 208                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 209 static void nfs_kill_super(struct super_block *);
 210 static void nfs_put_super(struct super_block *);
 211 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 212
 213 static struct file_system_type nfs_fs_type = {
 214         .owner          = THIS_MODULE,
 215         .name           = "nfs",
 216         .get_sb         = nfs_get_sb,
 217         .kill_sb        = nfs_kill_super,
 218         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 219 };
 220
 221 struct file_system_type nfs_xdev_fs_type = {
 222         .owner          = THIS_MODULE,
 223         .name           = "nfs",
 224         .get_sb         = nfs_xdev_get_sb,
 225         .kill_sb        = nfs_kill_super,
 226         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 227 };
 228
 229 static const struct super_operations nfs_sops = {
 230         .alloc_inode    = nfs_alloc_inode,
 231         .destroy_inode  = nfs_destroy_inode,
 232         .write_inode    = nfs_write_inode,
 233         .put_super      = nfs_put_super,
 234         .statfs         = nfs_statfs,
 235         .clear_inode    = nfs_clear_inode,
 236         .umount_begin   = nfs_umount_begin,
 237         .show_options   = nfs_show_options,
 238         .show_stats     = nfs_show_stats,
 239         .remount_fs     = nfs_remount,
 240 };
 241
 242 #ifdef CONFIG_NFS_V4
 243 static int nfs4_get_sb(struct file_system_type *fs_type,
 244         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 245 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
 246         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 247 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 248         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 249 static void nfs4_kill_super(struct super_block *sb);
 250
 251 static struct file_system_type nfs4_fs_type = {
 252         .owner          = THIS_MODULE,
 253         .name           = "nfs4",
 254         .get_sb         = nfs4_get_sb,
 255         .kill_sb        = nfs4_kill_super,
 256         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 257 };
 258
 259 struct file_system_type nfs4_xdev_fs_type = {
 260         .owner          = THIS_MODULE,
 261         .name           = "nfs4",
 262         .get_sb         = nfs4_xdev_get_sb,
 263         .kill_sb        = nfs4_kill_super,
 264         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 265 };
 266
 267 struct file_system_type nfs4_referral_fs_type = {
 268         .owner          = THIS_MODULE,
 269         .name           = "nfs4",
 270         .get_sb         = nfs4_referral_get_sb,
 271         .kill_sb        = nfs4_kill_super,
 272         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 273 };
 274
 275 static const struct super_operations nfs4_sops = {
 276         .alloc_inode    = nfs_alloc_inode,
 277         .destroy_inode  = nfs_destroy_inode,
 278         .write_inode    = nfs_write_inode,
 279         .statfs         = nfs_statfs,
 280         .clear_inode    = nfs4_clear_inode,
 281         .umount_begin   = nfs_umount_begin,
 282         .show_options   = nfs_show_options,
 283         .show_stats     = nfs_show_stats,
 284         .remount_fs     = nfs_remount,
 285 };
 286 #endif
 287
 288 static struct shrinker acl_shrinker = {
 289         .shrink         = nfs_access_cache_shrinker,
 290         .seeks          = DEFAULT_SEEKS,
 291 };
 292
 293 /*
 294  * Register the NFS filesystems
 295  */
 296 int __init register_nfs_fs(void)
 297 {
 298         int ret;
 299
 300         ret = register_filesystem(&nfs_fs_type);
 301         if (ret < 0)
 302                 goto error_0;
 303
 304         ret = nfs_register_sysctl();
 305         if (ret < 0)
 306                 goto error_1;
 307 #ifdef CONFIG_NFS_V4
 308         ret = register_filesystem(&nfs4_fs_type);
 309         if (ret < 0)
 310                 goto error_2;
 311 #endif
 312         register_shrinker(&acl_shrinker);
 313         return 0;
 314
 315 #ifdef CONFIG_NFS_V4
 316 error_2:
 317         nfs_unregister_sysctl();
 318 #endif
 319 error_1:
 320         unregister_filesystem(&nfs_fs_type);
 321 error_0:
 322         return ret;
 323 }
 324
 325 /*
 326  * Unregister the NFS filesystems
 327  */
 328 void __exit unregister_nfs_fs(void)
 329 {
 330         unregister_shrinker(&acl_shrinker);
 331 #ifdef CONFIG_NFS_V4
 332         unregister_filesystem(&nfs4_fs_type);
 333 #endif
 334         nfs_unregister_sysctl();
 335         unregister_filesystem(&nfs_fs_type);
 336 }
 337
 338 void nfs_sb_active(struct nfs_server *server)
 339 {
 340         atomic_inc(&server->active);
 341 }
 342
 343 void nfs_sb_deactive(struct nfs_server *server)
 344 {
 345         if (atomic_dec_and_test(&server->active))
 346                 wake_up(&server->active_wq);
 347 }
 348
 349 static void nfs_put_super(struct super_block *sb)
 350 {
 351         struct nfs_server *server = NFS_SB(sb);
 352         /*
 353          * Make sure there are no outstanding ops to this server.
 354          * If so, wait for them to finish before allowing the
 355          * unmount to continue.
 356          */
 357         wait_event(server->active_wq, atomic_read(&server->active) == 0);
 358 }
 359
 360 /*
 361  * Deliver file system statistics to userspace
 362  */
 363 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 364 {
 365         struct nfs_server *server = NFS_SB(dentry->d_sb);
 366         unsigned char blockbits;
 367         unsigned long blockres;
 368         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 369         struct nfs_fattr fattr;
 370         struct nfs_fsstat res = {
 371                         .fattr = &fattr,
 372         };
 373         int error;
 374
 375         lock_kernel();
 376
 377         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 378         if (error < 0)
 379                 goto out_err;
 380         buf->f_type = NFS_SUPER_MAGIC;
 381
 382         /*
 383          * Current versions of glibc do not correctly handle the
 384          * case where f_frsize != f_bsize.  Eventually we want to
 385          * report the value of wtmult in this field.
 386          */
 387         buf->f_frsize = dentry->d_sb->s_blocksize;
 388
 389         /*
 390          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 391          * are reported in units of f_frsize.  Linux hasn't had
 392          * an f_frsize field in its statfs struct until recently,
 393          * thus historically Linux's sys_statfs reports these
 394          * fields in units of f_bsize.
 395          */
 396         buf->f_bsize = dentry->d_sb->s_blocksize;
 397         blockbits = dentry->d_sb->s_blocksize_bits;
 398         blockres = (1 << blockbits) - 1;
 399         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 400         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 401         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 402
 403         buf->f_files = res.tfiles;
 404         buf->f_ffree = res.afiles;
 405
 406         buf->f_namelen = server->namelen;
 407
 408         unlock_kernel();
 409         return 0;
 410
 411  out_err:
 412         dprintk("%s: statfs error = %d\n", __func__, -error);
 413         unlock_kernel();
 414         return error;
 415 }
 416
 417 /*
 418  * Map the security flavour number to a name
 419  */
 420 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 421 {
 422         static const struct {
 423                 rpc_authflavor_t flavour;
 424                 const char *str;
 425         } sec_flavours[] = {
 426                 { RPC_AUTH_NULL, "null" },
 427                 { RPC_AUTH_UNIX, "sys" },
 428                 { RPC_AUTH_GSS_KRB5, "krb5" },
 429                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 430                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 431                 { RPC_AUTH_GSS_LKEY, "lkey" },
 432                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 433                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 434                 { RPC_AUTH_GSS_SPKM, "spkm" },
 435                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 436                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 437                 { UINT_MAX, "unknown" }
 438         };
 439         int i;
 440
 441         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 442                 if (sec_flavours[i].flavour == flavour)
 443                         break;
 444         }
 445         return sec_flavours[i].str;
 446 }
 447
 448 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 449                                     int showdefaults)
 450 {
 451         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
 452
 453         switch (sap->sa_family) {
 454         case AF_INET: {
 455                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 456                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
 457                                 NIPQUAD(sin->sin_addr.s_addr));
 458                 break;
 459         }
 460         case AF_INET6: {
 461                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 462                 seq_printf(m, ",mountaddr=" NIP6_FMT,
 463                                 NIP6(sin6->sin6_addr));
 464                 break;
 465         }
 466         default:
 467                 if (showdefaults)
 468                         seq_printf(m, ",mountaddr=unspecified");
 469         }
 470
 471         if (nfss->mountd_version || showdefaults)
 472                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
 473         if (nfss->mountd_port || showdefaults)
 474                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
 475
 476         switch (nfss->mountd_protocol) {
 477         case IPPROTO_UDP:
 478                 seq_printf(m, ",mountproto=udp");
 479                 break;
 480         case IPPROTO_TCP:
 481                 seq_printf(m, ",mountproto=tcp");
 482                 break;
 483         default:
 484                 if (showdefaults)
 485                         seq_printf(m, ",mountproto=auto");
 486         }
 487 }
 488
 489 /*
 490  * Describe the mount options in force on this server representation
 491  */
 492 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 493                                    int showdefaults)
 494 {
 495         static const struct proc_nfs_info {
 496                 int flag;
 497                 const char *str;
 498                 const char *nostr;
 499         } nfs_info[] = {
 500                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 501                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
 502                 { NFS_MOUNT_POSIX, ",posix", "" },
 503                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 504                 { NFS_MOUNT_NOAC, ",noac", "" },
 505                 { NFS_MOUNT_NONLM, ",nolock", "" },
 506                 { NFS_MOUNT_NOACL, ",noacl", "" },
 507                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 508                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
 509                 { 0, NULL, NULL }
 510         };
 511         const struct proc_nfs_info *nfs_infop;
 512         struct nfs_client *clp = nfss->nfs_client;
 513         u32 version = clp->rpc_ops->version;
 514
 515         seq_printf(m, ",vers=%u", version);
 516         seq_printf(m, ",rsize=%u", nfss->rsize);
 517         seq_printf(m, ",wsize=%u", nfss->wsize);
 518         if (nfss->bsize != 0)
 519                 seq_printf(m, ",bsize=%u", nfss->bsize);
 520         seq_printf(m, ",namlen=%u", nfss->namelen);
 521         if (nfss->acregmin != 3*HZ || showdefaults)
 522                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 523         if (nfss->acregmax != 60*HZ || showdefaults)
 524                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 525         if (nfss->acdirmin != 30*HZ || showdefaults)
 526                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 527         if (nfss->acdirmax != 60*HZ || showdefaults)
 528                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
 529         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 530                 if (nfss->flags & nfs_infop->flag)
 531                         seq_puts(m, nfs_infop->str);
 532                 else
 533                         seq_puts(m, nfs_infop->nostr);
 534         }
 535         seq_printf(m, ",proto=%s",
 536                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 537         if (version == 4) {
 538                 if (nfss->port != NFS_PORT)
 539                         seq_printf(m, ",port=%u", nfss->port);
 540         } else
 541                 if (nfss->port)
 542                         seq_printf(m, ",port=%u", nfss->port);
 543
 544         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 545         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 546         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 547
 548         if (version != 4)
 549                 nfs_show_mountd_options(m, nfss, showdefaults);
 550
 551 #ifdef CONFIG_NFS_V4
 552         if (clp->rpc_ops->version == 4)
 553                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
 554 #endif
 555 }
 556
 557 /*
 558  * Describe the mount options on this VFS mountpoint
 559  */
 560 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 561 {
 562         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 563
 564         nfs_show_mount_options(m, nfss, 0);
 565
 566         seq_printf(m, ",addr=%s",
 567                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 568                                                         RPC_DISPLAY_ADDR));
 569
 570         return 0;
 571 }
 572
 573 /*
 574  * Present statistical information for this VFS mountpoint
 575  */
 576 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 577 {
 578         int i, cpu;
 579         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 580         struct rpc_auth *auth = nfss->client->cl_auth;
 581         struct nfs_iostats totals = { };
 582
 583         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 584
 585         /*
 586          * Display all mount option settings
 587          */
 588         seq_printf(m, "\n\topts:\t");
 589         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 590         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 591         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 592         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 593         nfs_show_mount_options(m, nfss, 1);
 594
 595         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 596
 597         seq_printf(m, "\n\tcaps:\t");
 598         seq_printf(m, "caps=0x%x", nfss->caps);
 599         seq_printf(m, ",wtmult=%u", nfss->wtmult);
 600         seq_printf(m, ",dtsize=%u", nfss->dtsize);
 601         seq_printf(m, ",bsize=%u", nfss->bsize);
 602         seq_printf(m, ",namlen=%u", nfss->namelen);
 603
 604 #ifdef CONFIG_NFS_V4
 605         if (nfss->nfs_client->rpc_ops->version == 4) {
 606                 seq_printf(m, "\n\tnfsv4:\t");
 607                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 608                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 609                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 610         }
 611 #endif
 612
 613         /*
 614          * Display security flavor in effect for this mount
 615          */
 616         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
 617         if (auth->au_flavor)
 618                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
 619
 620         /*
 621          * Display superblock I/O counters
 622          */
 623         for_each_possible_cpu(cpu) {
 624                 struct nfs_iostats *stats;
 625
 626                 preempt_disable();
 627                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 628
 629                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 630                         totals.events[i] += stats->events[i];
 631                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 632                         totals.bytes[i] += stats->bytes[i];
 633
 634                 preempt_enable();
 635         }
 636
 637         seq_printf(m, "\n\tevents:\t");
 638         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 639                 seq_printf(m, "%lu ", totals.events[i]);
 640         seq_printf(m, "\n\tbytes:\t");
 641         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 642                 seq_printf(m, "%Lu ", totals.bytes[i]);
 643         seq_printf(m, "\n");
 644
 645         rpc_print_iostats(m, nfss->client);
 646
 647         return 0;
 648 }
 649
 650 /*
 651  * Begin unmount by attempting to remove all automounted mountpoints we added
 652  * in response to xdev traversals and referrals
 653  */
 654 static void nfs_umount_begin(struct super_block *sb)
 655 {
 656         struct nfs_server *server = NFS_SB(sb);
 657         struct rpc_clnt *rpc;
 658
 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 != htonl(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         if (data == NULL)
1224                 goto out_no_data;
1225
1226         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1227         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1228         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1229         args->timeo             = 600;
1230         args->retrans           = 2;
1231         args->acregmin          = 3;
1232         args->acregmax          = 60;
1233         args->acdirmin          = 30;
1234         args->acdirmax          = 60;
1235         args->mount_server.port = 0;    /* autobind unless user sets port */
1236         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1237         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1238         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1239
1240         switch (data->version) {
1241         case 1:
1242                 data->namlen = 0;
1243         case 2:
1244                 data->bsize = 0;
1245         case 3:
1246                 if (data->flags & NFS_MOUNT_VER3)
1247                         goto out_no_v3;
1248                 data->root.size = NFS2_FHSIZE;
1249                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1250         case 4:
1251                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1252                         goto out_no_sec;
1253         case 5:
1254                 memset(data->context, 0, sizeof(data->context));
1255         case 6:
1256                 if (data->flags & NFS_MOUNT_VER3) {
1257                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1258                                 goto out_invalid_fh;
1259                         mntfh->size = data->root.size;
1260                 } else
1261                         mntfh->size = NFS2_FHSIZE;
1262
1263
1264                 memcpy(mntfh->data, data->root.data, mntfh->size);
1265                 if (mntfh->size < sizeof(mntfh->data))
1266                         memset(mntfh->data + mntfh->size, 0,
1267                                sizeof(mntfh->data) - mntfh->size);
1268
1269                 /*
1270                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1271                  * can deal with.
1272                  */
1273                 args->flags             = data->flags;
1274                 args->rsize             = data->rsize;
1275                 args->wsize             = data->wsize;
1276                 args->timeo             = data->timeo;
1277                 args->retrans           = data->retrans;
1278                 args->acregmin          = data->acregmin;
1279                 args->acregmax          = data->acregmax;
1280                 args->acdirmin          = data->acdirmin;
1281                 args->acdirmax          = data->acdirmax;
1282
1283                 memcpy(&args->nfs_server.address, &data->addr,
1284                        sizeof(data->addr));
1285                 args->nfs_server.addrlen = sizeof(data->addr);
1286                 if (!nfs_verify_server_address((struct sockaddr *)
1287                                                 &args->nfs_server.address))
1288                         goto out_no_address;
1289
1290                 if (!(data->flags & NFS_MOUNT_TCP))
1291                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1292                 /* N.B. caller will free nfs_server.hostname in all cases */
1293                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1294                 args->namlen            = data->namlen;
1295                 args->bsize             = data->bsize;
1296                 args->auth_flavors[0]   = data->pseudoflavor;
1297                 if (!args->nfs_server.hostname)
1298                         goto out_nomem;
1299
1300                 /*
1301                  * The legacy version 6 binary mount data from userspace has a
1302                  * field used only to transport selinux information into the
1303                  * the kernel.  To continue to support that functionality we
1304                  * have a touch of selinux knowledge here in the NFS code. The
1305                  * userspace code converted context=blah to just blah so we are
1306                  * converting back to the full string selinux understands.
1307                  */
1308                 if (data->context[0]){
1309 #ifdef CONFIG_SECURITY_SELINUX
1310                         int rc;
1311                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1312                         if (!opts_str)
1313                                 return -ENOMEM;
1314                         strcpy(opts_str, "context=");
1315                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1316                         strcat(opts_str, &data->context[0]);
1317                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1318                         kfree(opts_str);
1319                         if (rc)
1320                                 return rc;
1321 #else
1322                         return -EINVAL;
1323 #endif
1324                 }
1325
1326                 break;
1327         default: {
1328                 unsigned int len;
1329                 char *c;
1330                 int status;
1331
1332                 if (nfs_parse_mount_options((char *)options, args) == 0)
1333                         return -EINVAL;
1334
1335                 if (!nfs_verify_server_address((struct sockaddr *)
1336                                                 &args->nfs_server.address))
1337                         goto out_no_address;
1338
1339                 c = strchr(dev_name, ':');
1340                 if (c == NULL)
1341                         return -EINVAL;
1342                 len = c - dev_name;
1343                 /* N.B. caller will free nfs_server.hostname in all cases */
1344                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1345                 if (!args->nfs_server.hostname)
1346                         goto out_nomem;
1347
1348                 c++;
1349                 if (strlen(c) > NFS_MAXPATHLEN)
1350                         return -ENAMETOOLONG;
1351                 args->nfs_server.export_path = c;
1352
1353                 status = nfs_try_mount(args, mntfh);
1354                 if (status)
1355                         return status;
1356
1357                 break;
1358                 }
1359         }
1360
1361         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1362                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1363
1364 #ifndef CONFIG_NFS_V3
1365         if (args->flags & NFS_MOUNT_VER3)
1366                 goto out_v3_not_compiled;
1367 #endif /* !CONFIG_NFS_V3 */
1368
1369         return 0;
1370
1371 out_no_data:
1372         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1373         return -EINVAL;
1374
1375 out_no_v3:
1376         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1377                  data->version);
1378         return -EINVAL;
1379
1380 out_no_sec:
1381         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1382         return -EINVAL;
1383
1384 #ifndef CONFIG_NFS_V3
1385 out_v3_not_compiled:
1386         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1387         return -EPROTONOSUPPORT;
1388 #endif /* !CONFIG_NFS_V3 */
1389
1390 out_nomem:
1391         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1392         return -ENOMEM;
1393
1394 out_no_address:
1395         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1396         return -EINVAL;
1397
1398 out_invalid_fh:
1399         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1400         return -EINVAL;
1401 }
1402
1403 static int
1404 nfs_compare_remount_data(struct nfs_server *nfss,
1405                          struct nfs_parsed_mount_data *data)
1406 {
1407         if (data->flags != nfss->flags ||
1408             data->rsize != nfss->rsize ||
1409             data->wsize != nfss->wsize ||
1410             data->retrans != nfss->client->cl_timeout->to_retries ||
1411             data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1412             data->acregmin != nfss->acregmin / HZ ||
1413             data->acregmax != nfss->acregmax / HZ ||
1414             data->acdirmin != nfss->acdirmin / HZ ||
1415             data->acdirmax != nfss->acdirmax / HZ ||
1416             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1417             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1418             memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1419                    data->nfs_server.addrlen) != 0)
1420                 return -EINVAL;
1421
1422         return 0;
1423 }
1424
1425 static int
1426 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1427 {
1428         int error;
1429         struct nfs_server *nfss = sb->s_fs_info;
1430         struct nfs_parsed_mount_data *data;
1431         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1432         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1433
1434         /*
1435          * Userspace mount programs that send binary options generally send
1436          * them populated with default values. We have no way to know which
1437          * ones were explicitly specified. Fall back to legacy behavior and
1438          * just return success.
1439          */
1440         if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1441             (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1442              options->version <= 6))
1443                 return 0;
1444
1445         data = kzalloc(sizeof(*data), GFP_KERNEL);
1446         if (data == NULL)
1447                 return -ENOMEM;
1448
1449         /* fill out struct with values from existing mount */
1450         data->flags = nfss->flags;
1451         data->rsize = nfss->rsize;
1452         data->wsize = nfss->wsize;
1453         data->retrans = nfss->client->cl_timeout->to_retries;
1454         data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1455         data->acregmin = nfss->acregmin / HZ;
1456         data->acregmax = nfss->acregmax / HZ;
1457         data->acdirmin = nfss->acdirmin / HZ;
1458         data->acdirmax = nfss->acdirmax / HZ;
1459         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1460         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1461         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1462                 data->nfs_server.addrlen);
1463
1464         /* overwrite those values with any that were specified */
1465         error = nfs_parse_mount_options((char *)options, data);
1466         if (error < 0)
1467                 goto out;
1468
1469         /* compare new mount options with old ones */
1470         error = nfs_compare_remount_data(nfss, data);
1471 out:
1472         kfree(data);
1473         return error;
1474 }
1475
1476 /*
1477  * Initialise the common bits of the superblock
1478  */
1479 static inline void nfs_initialise_sb(struct super_block *sb)
1480 {
1481         struct nfs_server *server = NFS_SB(sb);
1482
1483         sb->s_magic = NFS_SUPER_MAGIC;
1484
1485         /* We probably want something more informative here */
1486         snprintf(sb->s_id, sizeof(sb->s_id),
1487                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1488
1489         if (sb->s_blocksize == 0)
1490                 sb->s_blocksize = nfs_block_bits(server->wsize,
1491                                                  &sb->s_blocksize_bits);
1492
1493         if (server->flags & NFS_MOUNT_NOAC)
1494                 sb->s_flags |= MS_SYNCHRONOUS;
1495
1496         nfs_super_set_maxbytes(sb, server->maxfilesize);
1497 }
1498
1499 /*
1500  * Finish setting up an NFS2/3 superblock
1501  */
1502 static void nfs_fill_super(struct super_block *sb,
1503                            struct nfs_parsed_mount_data *data)
1504 {
1505         struct nfs_server *server = NFS_SB(sb);
1506
1507         sb->s_blocksize_bits = 0;
1508         sb->s_blocksize = 0;
1509         if (data->bsize)
1510                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1511
1512         if (server->flags & NFS_MOUNT_VER3) {
1513                 /* The VFS shouldn't apply the umask to mode bits. We will do
1514                  * so ourselves when necessary.
1515                  */
1516                 sb->s_flags |= MS_POSIXACL;
1517                 sb->s_time_gran = 1;
1518         }
1519
1520         sb->s_op = &nfs_sops;
1521         nfs_initialise_sb(sb);
1522 }
1523
1524 /*
1525  * Finish setting up a cloned NFS2/3 superblock
1526  */
1527 static void nfs_clone_super(struct super_block *sb,
1528                             const struct super_block *old_sb)
1529 {
1530         struct nfs_server *server = NFS_SB(sb);
1531
1532         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1533         sb->s_blocksize = old_sb->s_blocksize;
1534         sb->s_maxbytes = old_sb->s_maxbytes;
1535
1536         if (server->flags & NFS_MOUNT_VER3) {
1537                 /* The VFS shouldn't apply the umask to mode bits. We will do
1538                  * so ourselves when necessary.
1539                  */
1540                 sb->s_flags |= MS_POSIXACL;
1541                 sb->s_time_gran = 1;
1542         }
1543
1544         sb->s_op = old_sb->s_op;
1545         nfs_initialise_sb(sb);
1546 }
1547
1548 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1549
1550 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1551 {
1552         const struct nfs_server *a = s->s_fs_info;
1553         const struct rpc_clnt *clnt_a = a->client;
1554         const struct rpc_clnt *clnt_b = b->client;
1555
1556         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1557                 goto Ebusy;
1558         if (a->nfs_client != b->nfs_client)
1559                 goto Ebusy;
1560         if (a->flags != b->flags)
1561                 goto Ebusy;
1562         if (a->wsize != b->wsize)
1563                 goto Ebusy;
1564         if (a->rsize != b->rsize)
1565                 goto Ebusy;
1566         if (a->acregmin != b->acregmin)
1567                 goto Ebusy;
1568         if (a->acregmax != b->acregmax)
1569                 goto Ebusy;
1570         if (a->acdirmin != b->acdirmin)
1571                 goto Ebusy;
1572         if (a->acdirmax != b->acdirmax)
1573                 goto Ebusy;
1574         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1575                 goto Ebusy;
1576         return 1;
1577 Ebusy:
1578         return 0;
1579 }
1580
1581 struct nfs_sb_mountdata {
1582         struct nfs_server *server;
1583         int mntflags;
1584 };
1585
1586 static int nfs_set_super(struct super_block *s, void *data)
1587 {
1588         struct nfs_sb_mountdata *sb_mntdata = data;
1589         struct nfs_server *server = sb_mntdata->server;
1590         int ret;
1591
1592         s->s_flags = sb_mntdata->mntflags;
1593         s->s_fs_info = server;
1594         ret = set_anon_super(s, server);
1595         if (ret == 0)
1596                 server->s_dev = s->s_dev;
1597         return ret;
1598 }
1599
1600 static int nfs_compare_super_address(struct nfs_server *server1,
1601                                      struct nfs_server *server2)
1602 {
1603         struct sockaddr *sap1, *sap2;
1604
1605         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1606         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1607
1608         if (sap1->sa_family != sap2->sa_family)
1609                 return 0;
1610
1611         switch (sap1->sa_family) {
1612         case AF_INET: {
1613                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1614                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1615                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1616                         return 0;
1617                 if (sin1->sin_port != sin2->sin_port)
1618                         return 0;
1619                 break;
1620         }
1621         case AF_INET6: {
1622                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1623                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1624                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1625                         return 0;
1626                 if (sin1->sin6_port != sin2->sin6_port)
1627                         return 0;
1628                 break;
1629         }
1630         default:
1631                 return 0;
1632         }
1633
1634         return 1;
1635 }
1636
1637 static int nfs_compare_super(struct super_block *sb, void *data)
1638 {
1639         struct nfs_sb_mountdata *sb_mntdata = data;
1640         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1641         int mntflags = sb_mntdata->mntflags;
1642
1643         if (!nfs_compare_super_address(old, server))
1644                 return 0;
1645         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1646         if (old->flags & NFS_MOUNT_UNSHARED)
1647                 return 0;
1648         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1649                 return 0;
1650         return nfs_compare_mount_options(sb, server, mntflags);
1651 }
1652
1653 static int nfs_bdi_register(struct nfs_server *server)
1654 {
1655         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1656 }
1657
1658 static int nfs_get_sb(struct file_system_type *fs_type,
1659         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1660 {
1661         struct nfs_server *server = NULL;
1662         struct super_block *s;
1663         struct nfs_parsed_mount_data *data;
1664         struct nfs_fh *mntfh;
1665         struct dentry *mntroot;
1666         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1667         struct nfs_sb_mountdata sb_mntdata = {
1668                 .mntflags = flags,
1669         };
1670         int error = -ENOMEM;
1671
1672         data = kzalloc(sizeof(*data), GFP_KERNEL);
1673         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1674         if (data == NULL || mntfh == NULL)
1675                 goto out_free_fh;
1676
1677         security_init_mnt_opts(&data->lsm_opts);
1678
1679         /* Validate the mount data */
1680         error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1681         if (error < 0)
1682                 goto out;
1683
1684         /* Get a volume representation */
1685         server = nfs_create_server(data, mntfh);
1686         if (IS_ERR(server)) {
1687                 error = PTR_ERR(server);
1688                 goto out;
1689         }
1690         sb_mntdata.server = server;
1691
1692         if (server->flags & NFS_MOUNT_UNSHARED)
1693                 compare_super = NULL;
1694
1695         /* Get a superblock - note that we may end up sharing one that already exists */
1696         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1697         if (IS_ERR(s)) {
1698                 error = PTR_ERR(s);
1699                 goto out_err_nosb;
1700         }
1701
1702         if (s->s_fs_info != server) {
1703                 nfs_free_server(server);
1704                 server = NULL;
1705         } else {
1706                 error = nfs_bdi_register(server);
1707                 if (error)
1708                         goto error_splat_super;
1709         }
1710
1711         if (!s->s_root) {
1712                 /* initial superblock/root creation */
1713                 nfs_fill_super(s, data);
1714         }
1715
1716         mntroot = nfs_get_root(s, mntfh);
1717         if (IS_ERR(mntroot)) {
1718                 error = PTR_ERR(mntroot);
1719                 goto error_splat_super;
1720         }
1721
1722         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1723         if (error)
1724                 goto error_splat_root;
1725
1726         s->s_flags |= MS_ACTIVE;
1727         mnt->mnt_sb = s;
1728         mnt->mnt_root = mntroot;
1729         error = 0;
1730
1731 out:
1732         kfree(data->nfs_server.hostname);
1733         kfree(data->mount_server.hostname);
1734         security_free_mnt_opts(&data->lsm_opts);
1735 out_free_fh:
1736         kfree(mntfh);
1737         kfree(data);
1738         return error;
1739
1740 out_err_nosb:
1741         nfs_free_server(server);
1742         goto out;
1743
1744 error_splat_root:
1745         dput(mntroot);
1746 error_splat_super:
1747         up_write(&s->s_umount);
1748         deactivate_super(s);
1749         goto out;
1750 }
1751
1752 /*
1753  * Destroy an NFS2/3 superblock
1754  */
1755 static void nfs_kill_super(struct super_block *s)
1756 {
1757         struct nfs_server *server = NFS_SB(s);
1758
1759         bdi_unregister(&server->backing_dev_info);
1760         kill_anon_super(s);
1761         nfs_free_server(server);
1762 }
1763
1764 /*
1765  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1766  */
1767 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1768                            const char *dev_name, void *raw_data,
1769                            struct vfsmount *mnt)
1770 {
1771         struct nfs_clone_mount *data = raw_data;
1772         struct super_block *s;
1773         struct nfs_server *server;
1774         struct dentry *mntroot;
1775         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1776         struct nfs_sb_mountdata sb_mntdata = {
1777                 .mntflags = flags,
1778         };
1779         int error;
1780
1781         dprintk("--> nfs_xdev_get_sb()\n");
1782
1783         /* create a new volume representation */
1784         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1785         if (IS_ERR(server)) {
1786                 error = PTR_ERR(server);
1787                 goto out_err_noserver;
1788         }
1789         sb_mntdata.server = server;
1790
1791         if (server->flags & NFS_MOUNT_UNSHARED)
1792                 compare_super = NULL;
1793
1794         /* Get a superblock - note that we may end up sharing one that already exists */
1795         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1796         if (IS_ERR(s)) {
1797                 error = PTR_ERR(s);
1798                 goto out_err_nosb;
1799         }
1800
1801         if (s->s_fs_info != server) {
1802                 nfs_free_server(server);
1803                 server = NULL;
1804         } else {
1805                 error = nfs_bdi_register(server);
1806                 if (error)
1807                         goto error_splat_super;
1808         }
1809
1810         if (!s->s_root) {
1811                 /* initial superblock/root creation */
1812                 nfs_clone_super(s, data->sb);
1813         }
1814
1815         mntroot = nfs_get_root(s, data->fh);
1816         if (IS_ERR(mntroot)) {
1817                 error = PTR_ERR(mntroot);
1818                 goto error_splat_super;
1819         }
1820         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1821                 dput(mntroot);
1822                 error = -ESTALE;
1823                 goto error_splat_super;
1824         }
1825
1826         s->s_flags |= MS_ACTIVE;
1827         mnt->mnt_sb = s;
1828         mnt->mnt_root = mntroot;
1829
1830         /* clone any lsm security options from the parent to the new sb */
1831         security_sb_clone_mnt_opts(data->sb, s);
1832
1833         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1834         return 0;
1835
1836 out_err_nosb:
1837         nfs_free_server(server);
1838 out_err_noserver:
1839         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1840         return error;
1841
1842 error_splat_super:
1843         up_write(&s->s_umount);
1844         deactivate_super(s);
1845         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1846         return error;
1847 }
1848
1849 #ifdef CONFIG_NFS_V4
1850
1851 /*
1852  * Finish setting up a cloned NFS4 superblock
1853  */
1854 static void nfs4_clone_super(struct super_block *sb,
1855                             const struct super_block *old_sb)
1856 {
1857         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1858         sb->s_blocksize = old_sb->s_blocksize;
1859         sb->s_maxbytes = old_sb->s_maxbytes;
1860         sb->s_time_gran = 1;
1861         sb->s_op = old_sb->s_op;
1862         nfs_initialise_sb(sb);
1863 }
1864
1865 /*
1866  * Set up an NFS4 superblock
1867  */
1868 static void nfs4_fill_super(struct super_block *sb)
1869 {
1870         sb->s_time_gran = 1;
1871         sb->s_op = &nfs4_sops;
1872         nfs_initialise_sb(sb);
1873 }
1874
1875 /*
1876  * Validate NFSv4 mount options
1877  */
1878 static int nfs4_validate_mount_data(void *options,
1879                                     struct nfs_parsed_mount_data *args,
1880                                     const char *dev_name)
1881 {
1882         struct sockaddr_in *ap;
1883         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1884         char *c;
1885
1886         if (data == NULL)
1887                 goto out_no_data;
1888
1889         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1890         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1891         args->timeo             = 600;
1892         args->retrans           = 2;
1893         args->acregmin          = 3;
1894         args->acregmax          = 60;
1895         args->acdirmin          = 30;
1896         args->acdirmax          = 60;
1897         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1898         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1899
1900         switch (data->version) {
1901         case 1:
1902                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1903                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1904                         goto out_no_address;
1905                 if (data->host_addrlen == 0)
1906                         goto out_no_address;
1907                 args->nfs_server.addrlen = data->host_addrlen;
1908                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1909                         return -EFAULT;
1910                 if (!nfs_verify_server_address((struct sockaddr *)
1911                                                 &args->nfs_server.address))
1912                         goto out_no_address;
1913
1914                 switch (data->auth_flavourlen) {
1915                 case 0:
1916                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1917                         break;
1918                 case 1:
1919                         if (copy_from_user(&args->auth_flavors[0],
1920                                            data->auth_flavours,
1921                                            sizeof(args->auth_flavors[0])))
1922                                 return -EFAULT;
1923                         break;
1924                 default:
1925                         goto out_inval_auth;
1926                 }
1927
1928                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1929                 if (IS_ERR(c))
1930                         return PTR_ERR(c);
1931                 args->nfs_server.hostname = c;
1932
1933                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1934                 if (IS_ERR(c))
1935                         return PTR_ERR(c);
1936                 args->nfs_server.export_path = c;
1937                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1938
1939                 c = strndup_user(data->client_addr.data, 16);
1940                 if (IS_ERR(c))
1941                         return PTR_ERR(c);
1942                 args->client_address = c;
1943
1944                 /*
1945                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1946                  * can deal with.
1947                  */
1948
1949                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1950                 args->rsize     = data->rsize;
1951                 args->wsize     = data->wsize;
1952                 args->timeo     = data->timeo;
1953                 args->retrans   = data->retrans;
1954                 args->acregmin  = data->acregmin;
1955                 args->acregmax  = data->acregmax;
1956                 args->acdirmin  = data->acdirmin;
1957                 args->acdirmax  = data->acdirmax;
1958                 args->nfs_server.protocol = data->proto;
1959
1960                 break;
1961         default: {
1962                 unsigned int len;
1963
1964                 if (nfs_parse_mount_options((char *)options, args) == 0)
1965                         return -EINVAL;
1966
1967                 if (!nfs_verify_server_address((struct sockaddr *)
1968                                                 &args->nfs_server.address))
1969                         return -EINVAL;
1970
1971                 switch (args->auth_flavor_len) {
1972                 case 0:
1973                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1974                         break;
1975                 case 1:
1976                         break;
1977                 default:
1978                         goto out_inval_auth;
1979                 }
1980
1981                 /*
1982                  * Split "dev_name" into "hostname:mntpath".
1983                  */
1984                 c = strchr(dev_name, ':');
1985                 if (c == NULL)
1986                         return -EINVAL;
1987                 /* while calculating len, pretend ':' is '\0' */
1988                 len = c - dev_name;
1989                 if (len > NFS4_MAXNAMLEN)
1990                         return -ENAMETOOLONG;
1991                 /* N.B. caller will free nfs_server.hostname in all cases */
1992                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1993                 if (!args->nfs_server.hostname)
1994                         goto out_nomem;
1995
1996                 c++;                    /* step over the ':' */
1997                 len = strlen(c);
1998                 if (len > NFS4_MAXPATHLEN)
1999                         return -ENAMETOOLONG;
2000                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
2001                 if (!args->nfs_server.export_path)
2002                         goto out_nomem;
2003
2004                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2005
2006                 if (args->client_address == NULL)
2007                         goto out_no_client_address;
2008
2009                 break;
2010                 }
2011         }
2012
2013         return 0;
2014
2015 out_no_data:
2016         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2017         return -EINVAL;
2018
2019 out_inval_auth:
2020         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2021                  data->auth_flavourlen);
2022         return -EINVAL;
2023
2024 out_nomem:
2025         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2026         return -ENOMEM;
2027
2028 out_no_address:
2029         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2030         return -EINVAL;
2031
2032 out_no_client_address:
2033         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2034         return -EINVAL;
2035 }
2036
2037 /*
2038  * Get the superblock for an NFS4 mountpoint
2039  */
2040 static int nfs4_get_sb(struct file_system_type *fs_type,
2041         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2042 {
2043         struct nfs_parsed_mount_data *data;
2044         struct super_block *s;
2045         struct nfs_server *server;
2046         struct nfs_fh *mntfh;
2047         struct dentry *mntroot;
2048         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2049         struct nfs_sb_mountdata sb_mntdata = {
2050                 .mntflags = flags,
2051         };
2052         int error = -ENOMEM;
2053
2054         data = kzalloc(sizeof(*data), GFP_KERNEL);
2055         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2056         if (data == NULL || mntfh == NULL)
2057                 goto out_free_fh;
2058
2059         security_init_mnt_opts(&data->lsm_opts);
2060
2061         /* Validate the mount data */
2062         error = nfs4_validate_mount_data(raw_data, data, dev_name);
2063         if (error < 0)
2064                 goto out;
2065
2066         /* Get a volume representation */
2067         server = nfs4_create_server(data, mntfh);
2068         if (IS_ERR(server)) {
2069                 error = PTR_ERR(server);
2070                 goto out;
2071         }
2072         sb_mntdata.server = server;
2073
2074         if (server->flags & NFS4_MOUNT_UNSHARED)
2075                 compare_super = NULL;
2076
2077         /* Get a superblock - note that we may end up sharing one that already exists */
2078         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2079         if (IS_ERR(s)) {
2080                 error = PTR_ERR(s);
2081                 goto out_free;
2082         }
2083
2084         if (s->s_fs_info != server) {
2085                 nfs_free_server(server);
2086                 server = NULL;
2087         } else {
2088                 error = nfs_bdi_register(server);
2089                 if (error)
2090                         goto error_splat_super;
2091         }
2092
2093         if (!s->s_root) {
2094                 /* initial superblock/root creation */
2095                 nfs4_fill_super(s);
2096         }
2097
2098         mntroot = nfs4_get_root(s, mntfh);
2099         if (IS_ERR(mntroot)) {
2100                 error = PTR_ERR(mntroot);
2101                 goto error_splat_super;
2102         }
2103
2104         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2105         if (error)
2106                 goto error_splat_root;
2107
2108         s->s_flags |= MS_ACTIVE;
2109         mnt->mnt_sb = s;
2110         mnt->mnt_root = mntroot;
2111         error = 0;
2112
2113 out:
2114         kfree(data->client_address);
2115         kfree(data->nfs_server.export_path);
2116         kfree(data->nfs_server.hostname);
2117         security_free_mnt_opts(&data->lsm_opts);
2118 out_free_fh:
2119         kfree(mntfh);
2120         kfree(data);
2121         return error;
2122
2123 out_free:
2124         nfs_free_server(server);
2125         goto out;
2126
2127 error_splat_root:
2128         dput(mntroot);
2129 error_splat_super:
2130         up_write(&s->s_umount);
2131         deactivate_super(s);
2132         goto out;
2133 }
2134
2135 static void nfs4_kill_super(struct super_block *sb)
2136 {
2137         struct nfs_server *server = NFS_SB(sb);
2138
2139         nfs_return_all_delegations(sb);
2140         kill_anon_super(sb);
2141
2142         nfs4_renewd_prepare_shutdown(server);
2143         nfs_free_server(server);
2144 }
2145
2146 /*
2147  * Clone an NFS4 server record on xdev traversal (FSID-change)
2148  */
2149 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2150                             const char *dev_name, void *raw_data,
2151                             struct vfsmount *mnt)
2152 {
2153         struct nfs_clone_mount *data = raw_data;
2154         struct super_block *s;
2155         struct nfs_server *server;
2156         struct dentry *mntroot;
2157         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2158         struct nfs_sb_mountdata sb_mntdata = {
2159                 .mntflags = flags,
2160         };
2161         int error;
2162
2163         dprintk("--> nfs4_xdev_get_sb()\n");
2164
2165         /* create a new volume representation */
2166         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2167         if (IS_ERR(server)) {
2168                 error = PTR_ERR(server);
2169                 goto out_err_noserver;
2170         }
2171         sb_mntdata.server = server;
2172
2173         if (server->flags & NFS4_MOUNT_UNSHARED)
2174                 compare_super = NULL;
2175
2176         /* Get a superblock - note that we may end up sharing one that already exists */
2177         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2178         if (IS_ERR(s)) {
2179                 error = PTR_ERR(s);
2180                 goto out_err_nosb;
2181         }
2182
2183         if (s->s_fs_info != server) {
2184                 nfs_free_server(server);
2185                 server = NULL;
2186         } else {
2187                 error = nfs_bdi_register(server);
2188                 if (error)
2189                         goto error_splat_super;
2190         }
2191
2192         if (!s->s_root) {
2193                 /* initial superblock/root creation */
2194                 nfs4_clone_super(s, data->sb);
2195         }
2196
2197         mntroot = nfs4_get_root(s, data->fh);
2198         if (IS_ERR(mntroot)) {
2199                 error = PTR_ERR(mntroot);
2200                 goto error_splat_super;
2201         }
2202         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2203                 dput(mntroot);
2204                 error = -ESTALE;
2205                 goto error_splat_super;
2206         }
2207
2208         s->s_flags |= MS_ACTIVE;
2209         mnt->mnt_sb = s;
2210         mnt->mnt_root = mntroot;
2211
2212         security_sb_clone_mnt_opts(data->sb, s);
2213
2214         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2215         return 0;
2216
2217 out_err_nosb:
2218         nfs_free_server(server);
2219 out_err_noserver:
2220         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2221         return error;
2222
2223 error_splat_super:
2224         up_write(&s->s_umount);
2225         deactivate_super(s);
2226         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2227         return error;
2228 }
2229
2230 /*
2231  * Create an NFS4 server record on referral traversal
2232  */
2233 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2234                                 const char *dev_name, void *raw_data,
2235                                 struct vfsmount *mnt)
2236 {
2237         struct nfs_clone_mount *data = raw_data;
2238         struct super_block *s;
2239         struct nfs_server *server;
2240         struct dentry *mntroot;
2241         struct nfs_fh mntfh;
2242         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2243         struct nfs_sb_mountdata sb_mntdata = {
2244                 .mntflags = flags,
2245         };
2246         int error;
2247
2248         dprintk("--> nfs4_referral_get_sb()\n");
2249
2250         /* create a new volume representation */
2251         server = nfs4_create_referral_server(data, &mntfh);
2252         if (IS_ERR(server)) {
2253                 error = PTR_ERR(server);
2254                 goto out_err_noserver;
2255         }
2256         sb_mntdata.server = server;
2257
2258         if (server->flags & NFS4_MOUNT_UNSHARED)
2259                 compare_super = NULL;
2260
2261         /* Get a superblock - note that we may end up sharing one that already exists */
2262         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2263         if (IS_ERR(s)) {
2264                 error = PTR_ERR(s);
2265                 goto out_err_nosb;
2266         }
2267
2268         if (s->s_fs_info != server) {
2269                 nfs_free_server(server);
2270                 server = NULL;
2271         } else {
2272                 error = nfs_bdi_register(server);
2273                 if (error)
2274                         goto error_splat_super;
2275         }
2276
2277         if (!s->s_root) {
2278                 /* initial superblock/root creation */
2279                 nfs4_fill_super(s);
2280         }
2281
2282         mntroot = nfs4_get_root(s, &mntfh);
2283         if (IS_ERR(mntroot)) {
2284                 error = PTR_ERR(mntroot);
2285                 goto error_splat_super;
2286         }
2287         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2288                 dput(mntroot);
2289                 error = -ESTALE;
2290                 goto error_splat_super;
2291         }
2292
2293         s->s_flags |= MS_ACTIVE;
2294         mnt->mnt_sb = s;
2295         mnt->mnt_root = mntroot;
2296
2297         security_sb_clone_mnt_opts(data->sb, s);
2298
2299         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2300         return 0;
2301
2302 out_err_nosb:
2303         nfs_free_server(server);
2304 out_err_noserver:
2305         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2306         return error;
2307
2308 error_splat_super:
2309         up_write(&s->s_umount);
2310         deactivate_super(s);
2311         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2312         return error;
2313 }
2314
2315 #endif /* CONFIG_NFS_V4 */