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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/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/netdevice.h>
  51 #include <linux/nfs_xdr.h>
  52 #include <linux/magic.h>
  53 #include <linux/parser.h>
  54
  55 #include <asm/system.h>
  56 #include <asm/uaccess.h>
  57
  58 #include "nfs4_fs.h"
  59 #include "callback.h"
  60 #include "delegation.h"
  61 #include "iostat.h"
  62 #include "internal.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_VFS
  65
  66 enum {
  67         /* Mount options that take no arguments */
  68         Opt_soft, Opt_hard,
  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_deprecated, "intr" },
 109         { Opt_deprecated, "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 != NFS_DEF_ACREGMIN*HZ || showdefaults)
 522                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 523         if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
 524                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 525         if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
 526                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 527         if (nfss->acdirmax != NFS_DEF_ACDIRMAX*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 static void nfs_parse_ipv4_address(char *string, size_t str_len,
 710                                    struct sockaddr *sap, size_t *addr_len)
 711 {
 712         struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 713         u8 *addr = (u8 *)&sin->sin_addr.s_addr;
 714
 715         if (str_len <= INET_ADDRSTRLEN) {
 716                 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
 717                                 (int)str_len, string);
 718
 719                 sin->sin_family = AF_INET;
 720                 *addr_len = sizeof(*sin);
 721                 if (in4_pton(string, str_len, addr, '\0', NULL))
 722                         return;
 723         }
 724
 725         sap->sa_family = AF_UNSPEC;
 726         *addr_len = 0;
 727 }
 728
 729 #define IPV6_SCOPE_DELIMITER    '%'
 730
 731 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 732 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
 733                                     const char *delim,
 734                                     struct sockaddr_in6 *sin6)
 735 {
 736         char *p;
 737         size_t len;
 738
 739         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
 740                 return ;
 741         if (*delim != IPV6_SCOPE_DELIMITER)
 742                 return;
 743
 744         len = (string + str_len) - delim - 1;
 745         p = kstrndup(delim + 1, len, GFP_KERNEL);
 746         if (p) {
 747                 unsigned long scope_id = 0;
 748                 struct net_device *dev;
 749
 750                 dev = dev_get_by_name(&init_net, p);
 751                 if (dev != NULL) {
 752                         scope_id = dev->ifindex;
 753                         dev_put(dev);
 754                 } else {
 755                         /* scope_id is set to zero on error */
 756                         strict_strtoul(p, 10, &scope_id);
 757                 }
 758
 759                 kfree(p);
 760                 sin6->sin6_scope_id = scope_id;
 761                 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
 762         }
 763 }
 764
 765 static void nfs_parse_ipv6_address(char *string, size_t str_len,
 766                                    struct sockaddr *sap, size_t *addr_len)
 767 {
 768         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 769         u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
 770         const char *delim;
 771
 772         if (str_len <= INET6_ADDRSTRLEN) {
 773                 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
 774                                 (int)str_len, string);
 775
 776                 sin6->sin6_family = AF_INET6;
 777                 *addr_len = sizeof(*sin6);
 778                 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
 779                         nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
 780                         return;
 781                 }
 782         }
 783
 784         sap->sa_family = AF_UNSPEC;
 785         *addr_len = 0;
 786 }
 787 #else
 788 static void nfs_parse_ipv6_address(char *string, size_t str_len,
 789                                    struct sockaddr *sap, size_t *addr_len)
 790 {
 791         sap->sa_family = AF_UNSPEC;
 792         *addr_len = 0;
 793 }
 794 #endif
 795
 796 /*
 797  * Construct a sockaddr based on the contents of a string that contains
 798  * an IP address in presentation format.
 799  *
 800  * If there is a problem constructing the new sockaddr, set the address
 801  * family to AF_UNSPEC.
 802  */
 803 static void nfs_parse_ip_address(char *string, size_t str_len,
 804                                  struct sockaddr *sap, size_t *addr_len)
 805 {
 806         unsigned int i, colons;
 807
 808         colons = 0;
 809         for (i = 0; i < str_len; i++)
 810                 if (string[i] == ':')
 811                         colons++;
 812
 813         if (colons >= 2)
 814                 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
 815         else
 816                 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
 817 }
 818
 819 /*
 820  * Sanity check the NFS transport protocol.
 821  *
 822  */
 823 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
 824 {
 825         switch (mnt->nfs_server.protocol) {
 826         case XPRT_TRANSPORT_UDP:
 827         case XPRT_TRANSPORT_TCP:
 828         case XPRT_TRANSPORT_RDMA:
 829                 break;
 830         default:
 831                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 832         }
 833 }
 834
 835 /*
 836  * For text based NFSv2/v3 mounts, the mount protocol transport default
 837  * settings should depend upon the specified NFS transport.
 838  */
 839 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
 840 {
 841         nfs_validate_transport_protocol(mnt);
 842
 843         if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
 844             mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
 845                         return;
 846         switch (mnt->nfs_server.protocol) {
 847         case XPRT_TRANSPORT_UDP:
 848                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
 849                 break;
 850         case XPRT_TRANSPORT_TCP:
 851         case XPRT_TRANSPORT_RDMA:
 852                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
 853         }
 854 }
 855
 856 /*
 857  * Error-check and convert a string of mount options from user space into
 858  * a data structure
 859  */
 860 static int nfs_parse_mount_options(char *raw,
 861                                    struct nfs_parsed_mount_data *mnt)
 862 {
 863         char *p, *string, *secdata;
 864         int rc;
 865
 866         if (!raw) {
 867                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 868                 return 1;
 869         }
 870         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 871
 872         secdata = alloc_secdata();
 873         if (!secdata)
 874                 goto out_nomem;
 875
 876         rc = security_sb_copy_data(raw, secdata);
 877         if (rc)
 878                 goto out_security_failure;
 879
 880         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 881         if (rc)
 882                 goto out_security_failure;
 883
 884         free_secdata(secdata);
 885
 886         while ((p = strsep(&raw, ",")) != NULL) {
 887                 substring_t args[MAX_OPT_ARGS];
 888                 int option, token;
 889
 890                 if (!*p)
 891                         continue;
 892
 893                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 894
 895                 token = match_token(p, nfs_mount_option_tokens, args);
 896                 switch (token) {
 897                 case Opt_soft:
 898                         mnt->flags |= NFS_MOUNT_SOFT;
 899                         break;
 900                 case Opt_hard:
 901                         mnt->flags &= ~NFS_MOUNT_SOFT;
 902                         break;
 903                 case Opt_posix:
 904                         mnt->flags |= NFS_MOUNT_POSIX;
 905                         break;
 906                 case Opt_noposix:
 907                         mnt->flags &= ~NFS_MOUNT_POSIX;
 908                         break;
 909                 case Opt_cto:
 910                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 911                         break;
 912                 case Opt_nocto:
 913                         mnt->flags |= NFS_MOUNT_NOCTO;
 914                         break;
 915                 case Opt_ac:
 916                         mnt->flags &= ~NFS_MOUNT_NOAC;
 917                         break;
 918                 case Opt_noac:
 919                         mnt->flags |= NFS_MOUNT_NOAC;
 920                         break;
 921                 case Opt_lock:
 922                         mnt->flags &= ~NFS_MOUNT_NONLM;
 923                         break;
 924                 case Opt_nolock:
 925                         mnt->flags |= NFS_MOUNT_NONLM;
 926                         break;
 927                 case Opt_v2:
 928                         mnt->flags &= ~NFS_MOUNT_VER3;
 929                         break;
 930                 case Opt_v3:
 931                         mnt->flags |= NFS_MOUNT_VER3;
 932                         break;
 933                 case Opt_udp:
 934                         mnt->flags &= ~NFS_MOUNT_TCP;
 935                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 936                         break;
 937                 case Opt_tcp:
 938                         mnt->flags |= NFS_MOUNT_TCP;
 939                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 940                         break;
 941                 case Opt_rdma:
 942                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 943                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 944                         break;
 945                 case Opt_acl:
 946                         mnt->flags &= ~NFS_MOUNT_NOACL;
 947                         break;
 948                 case Opt_noacl:
 949                         mnt->flags |= NFS_MOUNT_NOACL;
 950                         break;
 951                 case Opt_rdirplus:
 952                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 953                         break;
 954                 case Opt_nordirplus:
 955                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 956                         break;
 957                 case Opt_sharecache:
 958                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 959                         break;
 960                 case Opt_nosharecache:
 961                         mnt->flags |= NFS_MOUNT_UNSHARED;
 962                         break;
 963
 964                 case Opt_port:
 965                         if (match_int(args, &option))
 966                                 return 0;
 967                         if (option < 0 || option > 65535)
 968                                 return 0;
 969                         mnt->nfs_server.port = option;
 970                         break;
 971                 case Opt_rsize:
 972                         if (match_int(args, &mnt->rsize))
 973                                 return 0;
 974                         break;
 975                 case Opt_wsize:
 976                         if (match_int(args, &mnt->wsize))
 977                                 return 0;
 978                         break;
 979                 case Opt_bsize:
 980                         if (match_int(args, &option))
 981                                 return 0;
 982                         if (option < 0)
 983                                 return 0;
 984                         mnt->bsize = option;
 985                         break;
 986                 case Opt_timeo:
 987                         if (match_int(args, &mnt->timeo))
 988                                 return 0;
 989                         break;
 990                 case Opt_retrans:
 991                         if (match_int(args, &mnt->retrans))
 992                                 return 0;
 993                         break;
 994                 case Opt_acregmin:
 995                         if (match_int(args, &mnt->acregmin))
 996                                 return 0;
 997                         break;
 998                 case Opt_acregmax:
 999                         if (match_int(args, &mnt->acregmax))
1000                                 return 0;
1001                         break;
1002                 case Opt_acdirmin:
1003                         if (match_int(args, &mnt->acdirmin))
1004                                 return 0;
1005                         break;
1006                 case Opt_acdirmax:
1007                         if (match_int(args, &mnt->acdirmax))
1008                                 return 0;
1009                         break;
1010                 case Opt_actimeo:
1011                         if (match_int(args, &option))
1012                                 return 0;
1013                         if (option < 0)
1014                                 return 0;
1015                         mnt->acregmin =
1016                         mnt->acregmax =
1017                         mnt->acdirmin =
1018                         mnt->acdirmax = option;
1019                         break;
1020                 case Opt_namelen:
1021                         if (match_int(args, &mnt->namlen))
1022                                 return 0;
1023                         break;
1024                 case Opt_mountport:
1025                         if (match_int(args, &option))
1026                                 return 0;
1027                         if (option < 0 || option > 65535)
1028                                 return 0;
1029                         mnt->mount_server.port = option;
1030                         break;
1031                 case Opt_mountvers:
1032                         if (match_int(args, &option))
1033                                 return 0;
1034                         if (option < 0)
1035                                 return 0;
1036                         mnt->mount_server.version = option;
1037                         break;
1038                 case Opt_nfsvers:
1039                         if (match_int(args, &option))
1040                                 return 0;
1041                         switch (option) {
1042                         case 2:
1043                                 mnt->flags &= ~NFS_MOUNT_VER3;
1044                                 break;
1045                         case 3:
1046                                 mnt->flags |= NFS_MOUNT_VER3;
1047                                 break;
1048                         default:
1049                                 goto out_unrec_vers;
1050                         }
1051                         break;
1052
1053                 case Opt_sec:
1054                         string = match_strdup(args);
1055                         if (string == NULL)
1056                                 goto out_nomem;
1057                         token = match_token(string, nfs_secflavor_tokens, args);
1058                         kfree(string);
1059
1060                         /*
1061                          * The flags setting is for v2/v3.  The flavor_len
1062                          * setting is for v4.  v2/v3 also need to know the
1063                          * difference between NULL and UNIX.
1064                          */
1065                         switch (token) {
1066                         case Opt_sec_none:
1067                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
1068                                 mnt->auth_flavor_len = 0;
1069                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1070                                 break;
1071                         case Opt_sec_sys:
1072                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
1073                                 mnt->auth_flavor_len = 0;
1074                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1075                                 break;
1076                         case Opt_sec_krb5:
1077                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1078                                 mnt->auth_flavor_len = 1;
1079                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1080                                 break;
1081                         case Opt_sec_krb5i:
1082                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1083                                 mnt->auth_flavor_len = 1;
1084                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1085                                 break;
1086                         case Opt_sec_krb5p:
1087                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1088                                 mnt->auth_flavor_len = 1;
1089                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1090                                 break;
1091                         case Opt_sec_lkey:
1092                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1093                                 mnt->auth_flavor_len = 1;
1094                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1095                                 break;
1096                         case Opt_sec_lkeyi:
1097                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1098                                 mnt->auth_flavor_len = 1;
1099                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1100                                 break;
1101                         case Opt_sec_lkeyp:
1102                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1103                                 mnt->auth_flavor_len = 1;
1104                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1105                                 break;
1106                         case Opt_sec_spkm:
1107                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1108                                 mnt->auth_flavor_len = 1;
1109                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1110                                 break;
1111                         case Opt_sec_spkmi:
1112                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1113                                 mnt->auth_flavor_len = 1;
1114                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1115                                 break;
1116                         case Opt_sec_spkmp:
1117                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1118                                 mnt->auth_flavor_len = 1;
1119                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1120                                 break;
1121                         default:
1122                                 goto out_unrec_sec;
1123                         }
1124                         break;
1125                 case Opt_proto:
1126                         string = match_strdup(args);
1127                         if (string == NULL)
1128                                 goto out_nomem;
1129                         token = match_token(string,
1130                                             nfs_xprt_protocol_tokens, args);
1131                         kfree(string);
1132
1133                         switch (token) {
1134                         case Opt_xprt_udp:
1135                                 mnt->flags &= ~NFS_MOUNT_TCP;
1136                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1137                                 break;
1138                         case Opt_xprt_tcp:
1139                                 mnt->flags |= NFS_MOUNT_TCP;
1140                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1141                                 break;
1142                         case Opt_xprt_rdma:
1143                                 /* vector side protocols to TCP */
1144                                 mnt->flags |= NFS_MOUNT_TCP;
1145                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1146                                 break;
1147                         default:
1148                                 goto out_unrec_xprt;
1149                         }
1150                         break;
1151                 case Opt_mountproto:
1152                         string = match_strdup(args);
1153                         if (string == NULL)
1154                                 goto out_nomem;
1155                         token = match_token(string,
1156                                             nfs_xprt_protocol_tokens, args);
1157                         kfree(string);
1158
1159                         switch (token) {
1160                         case Opt_xprt_udp:
1161                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1162                                 break;
1163                         case Opt_xprt_tcp:
1164                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1165                                 break;
1166                         case Opt_xprt_rdma: /* not used for side protocols */
1167                         default:
1168                                 goto out_unrec_xprt;
1169                         }
1170                         break;
1171                 case Opt_addr:
1172                         string = match_strdup(args);
1173                         if (string == NULL)
1174                                 goto out_nomem;
1175                         nfs_parse_ip_address(string, strlen(string),
1176                                              (struct sockaddr *)
1177                                                 &mnt->nfs_server.address,
1178                                              &mnt->nfs_server.addrlen);
1179                         kfree(string);
1180                         break;
1181                 case Opt_clientaddr:
1182                         string = match_strdup(args);
1183                         if (string == NULL)
1184                                 goto out_nomem;
1185                         kfree(mnt->client_address);
1186                         mnt->client_address = string;
1187                         break;
1188                 case Opt_mounthost:
1189                         string = match_strdup(args);
1190                         if (string == NULL)
1191                                 goto out_nomem;
1192                         kfree(mnt->mount_server.hostname);
1193                         mnt->mount_server.hostname = string;
1194                         break;
1195                 case Opt_mountaddr:
1196                         string = match_strdup(args);
1197                         if (string == NULL)
1198                                 goto out_nomem;
1199                         nfs_parse_ip_address(string, strlen(string),
1200                                              (struct sockaddr *)
1201                                                 &mnt->mount_server.address,
1202                                              &mnt->mount_server.addrlen);
1203                         kfree(string);
1204                         break;
1205
1206                 case Opt_userspace:
1207                 case Opt_deprecated:
1208                         dfprintk(MOUNT, "NFS:   ignoring mount option "
1209                                         "'%s'\n", p);
1210                         break;
1211
1212                 default:
1213                         goto out_unknown;
1214                 }
1215         }
1216
1217         return 1;
1218
1219 out_nomem:
1220         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1221         return 0;
1222 out_security_failure:
1223         free_secdata(secdata);
1224         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1225         return 0;
1226 out_unrec_vers:
1227         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1228         return 0;
1229
1230 out_unrec_xprt:
1231         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1232         return 0;
1233
1234 out_unrec_sec:
1235         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1236         return 0;
1237
1238 out_unknown:
1239         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1240         return 0;
1241 }
1242
1243 /*
1244  * Use the remote server's MOUNT service to request the NFS file handle
1245  * corresponding to the provided path.
1246  */
1247 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1248                          struct nfs_fh *root_fh)
1249 {
1250         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1251         char *hostname;
1252         int status;
1253
1254         if (args->mount_server.version == 0) {
1255                 if (args->flags & NFS_MOUNT_VER3)
1256                         args->mount_server.version = NFS_MNT3_VERSION;
1257                 else
1258                         args->mount_server.version = NFS_MNT_VERSION;
1259         }
1260
1261         if (args->mount_server.hostname)
1262                 hostname = args->mount_server.hostname;
1263         else
1264                 hostname = args->nfs_server.hostname;
1265
1266         /*
1267          * Construct the mount server's address.
1268          */
1269         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1270                 memcpy(sap, &args->nfs_server.address,
1271                        args->nfs_server.addrlen);
1272                 args->mount_server.addrlen = args->nfs_server.addrlen;
1273         }
1274
1275         /*
1276          * autobind will be used if mount_server.port == 0
1277          */
1278         nfs_set_port(sap, args->mount_server.port);
1279
1280         /*
1281          * Now ask the mount server to map our export path
1282          * to a file handle.
1283          */
1284         status = nfs_mount(sap,
1285                            args->mount_server.addrlen,
1286                            hostname,
1287                            args->nfs_server.export_path,
1288                            args->mount_server.version,
1289                            args->mount_server.protocol,
1290                            root_fh);
1291         if (status == 0)
1292                 return 0;
1293
1294         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1295                         hostname, status);
1296         return status;
1297 }
1298
1299 static int nfs_parse_simple_hostname(const char *dev_name,
1300                                      char **hostname, size_t maxnamlen,
1301                                      char **export_path, size_t maxpathlen)
1302 {
1303         size_t len;
1304         char *colon, *comma;
1305
1306         colon = strchr(dev_name, ':');
1307         if (colon == NULL)
1308                 goto out_bad_devname;
1309
1310         len = colon - dev_name;
1311         if (len > maxnamlen)
1312                 goto out_hostname;
1313
1314         /* N.B. caller will free nfs_server.hostname in all cases */
1315         *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1316         if (!*hostname)
1317                 goto out_nomem;
1318
1319         /* kill possible hostname list: not supported */
1320         comma = strchr(*hostname, ',');
1321         if (comma != NULL) {
1322                 if (comma == *hostname)
1323                         goto out_bad_devname;
1324                 *comma = '\0';
1325         }
1326
1327         colon++;
1328         len = strlen(colon);
1329         if (len > maxpathlen)
1330                 goto out_path;
1331         *export_path = kstrndup(colon, len, GFP_KERNEL);
1332         if (!*export_path)
1333                 goto out_nomem;
1334
1335         dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1336         return 0;
1337
1338 out_bad_devname:
1339         dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1340         return -EINVAL;
1341
1342 out_nomem:
1343         dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1344         return -ENOMEM;
1345
1346 out_hostname:
1347         dfprintk(MOUNT, "NFS: server hostname too long\n");
1348         return -ENAMETOOLONG;
1349
1350 out_path:
1351         dfprintk(MOUNT, "NFS: export pathname too long\n");
1352         return -ENAMETOOLONG;
1353 }
1354
1355 /*
1356  * Hostname has square brackets around it because it contains one or
1357  * more colons.  We look for the first closing square bracket, and a
1358  * colon must follow it.
1359  */
1360 static int nfs_parse_protected_hostname(const char *dev_name,
1361                                         char **hostname, size_t maxnamlen,
1362                                         char **export_path, size_t maxpathlen)
1363 {
1364         size_t len;
1365         char *start, *end;
1366
1367         start = (char *)(dev_name + 1);
1368
1369         end = strchr(start, ']');
1370         if (end == NULL)
1371                 goto out_bad_devname;
1372         if (*(end + 1) != ':')
1373                 goto out_bad_devname;
1374
1375         len = end - start;
1376         if (len > maxnamlen)
1377                 goto out_hostname;
1378
1379         /* N.B. caller will free nfs_server.hostname in all cases */
1380         *hostname = kstrndup(start, len, GFP_KERNEL);
1381         if (*hostname == NULL)
1382                 goto out_nomem;
1383
1384         end += 2;
1385         len = strlen(end);
1386         if (len > maxpathlen)
1387                 goto out_path;
1388         *export_path = kstrndup(end, len, GFP_KERNEL);
1389         if (!*export_path)
1390                 goto out_nomem;
1391
1392         return 0;
1393
1394 out_bad_devname:
1395         dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1396         return -EINVAL;
1397
1398 out_nomem:
1399         dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1400         return -ENOMEM;
1401
1402 out_hostname:
1403         dfprintk(MOUNT, "NFS: server hostname too long\n");
1404         return -ENAMETOOLONG;
1405
1406 out_path:
1407         dfprintk(MOUNT, "NFS: export pathname too long\n");
1408         return -ENAMETOOLONG;
1409 }
1410
1411 /*
1412  * Split "dev_name" into "hostname:export_path".
1413  *
1414  * The leftmost colon demarks the split between the server's hostname
1415  * and the export path.  If the hostname starts with a left square
1416  * bracket, then it may contain colons.
1417  *
1418  * Note: caller frees hostname and export path, even on error.
1419  */
1420 static int nfs_parse_devname(const char *dev_name,
1421                              char **hostname, size_t maxnamlen,
1422                              char **export_path, size_t maxpathlen)
1423 {
1424         if (*dev_name == '[')
1425                 return nfs_parse_protected_hostname(dev_name,
1426                                                     hostname, maxnamlen,
1427                                                     export_path, maxpathlen);
1428
1429         return nfs_parse_simple_hostname(dev_name,
1430                                          hostname, maxnamlen,
1431                                          export_path, maxpathlen);
1432 }
1433
1434 /*
1435  * Validate the NFS2/NFS3 mount data
1436  * - fills in the mount root filehandle
1437  *
1438  * For option strings, user space handles the following behaviors:
1439  *
1440  * + DNS: mapping server host name to IP address ("addr=" option)
1441  *
1442  * + failure mode: how to behave if a mount request can't be handled
1443  *   immediately ("fg/bg" option)
1444  *
1445  * + retry: how often to retry a mount request ("retry=" option)
1446  *
1447  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1448  *   mountproto=tcp after mountproto=udp, and so on
1449  */
1450 static int nfs_validate_mount_data(void *options,
1451                                    struct nfs_parsed_mount_data *args,
1452                                    struct nfs_fh *mntfh,
1453                                    const char *dev_name)
1454 {
1455         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1456
1457         if (data == NULL)
1458                 goto out_no_data;
1459
1460         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1461         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1462         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1463         args->acregmin          = NFS_DEF_ACREGMIN;
1464         args->acregmax          = NFS_DEF_ACREGMAX;
1465         args->acdirmin          = NFS_DEF_ACDIRMIN;
1466         args->acdirmax          = NFS_DEF_ACDIRMAX;
1467         args->mount_server.port = 0;    /* autobind unless user sets port */
1468         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1469         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1470
1471         switch (data->version) {
1472         case 1:
1473                 data->namlen = 0;
1474         case 2:
1475                 data->bsize = 0;
1476         case 3:
1477                 if (data->flags & NFS_MOUNT_VER3)
1478                         goto out_no_v3;
1479                 data->root.size = NFS2_FHSIZE;
1480                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1481         case 4:
1482                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1483                         goto out_no_sec;
1484         case 5:
1485                 memset(data->context, 0, sizeof(data->context));
1486         case 6:
1487                 if (data->flags & NFS_MOUNT_VER3) {
1488                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1489                                 goto out_invalid_fh;
1490                         mntfh->size = data->root.size;
1491                 } else
1492                         mntfh->size = NFS2_FHSIZE;
1493
1494
1495                 memcpy(mntfh->data, data->root.data, mntfh->size);
1496                 if (mntfh->size < sizeof(mntfh->data))
1497                         memset(mntfh->data + mntfh->size, 0,
1498                                sizeof(mntfh->data) - mntfh->size);
1499
1500                 /*
1501                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1502                  * can deal with.
1503                  */
1504                 args->flags             = data->flags;
1505                 args->rsize             = data->rsize;
1506                 args->wsize             = data->wsize;
1507                 args->timeo             = data->timeo;
1508                 args->retrans           = data->retrans;
1509                 args->acregmin          = data->acregmin;
1510                 args->acregmax          = data->acregmax;
1511                 args->acdirmin          = data->acdirmin;
1512                 args->acdirmax          = data->acdirmax;
1513
1514                 memcpy(&args->nfs_server.address, &data->addr,
1515                        sizeof(data->addr));
1516                 args->nfs_server.addrlen = sizeof(data->addr);
1517                 if (!nfs_verify_server_address((struct sockaddr *)
1518                                                 &args->nfs_server.address))
1519                         goto out_no_address;
1520
1521                 if (!(data->flags & NFS_MOUNT_TCP))
1522                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1523                 /* N.B. caller will free nfs_server.hostname in all cases */
1524                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1525                 args->namlen            = data->namlen;
1526                 args->bsize             = data->bsize;
1527                 args->auth_flavors[0]   = data->pseudoflavor;
1528                 if (!args->nfs_server.hostname)
1529                         goto out_nomem;
1530
1531                 /*
1532                  * The legacy version 6 binary mount data from userspace has a
1533                  * field used only to transport selinux information into the
1534                  * the kernel.  To continue to support that functionality we
1535                  * have a touch of selinux knowledge here in the NFS code. The
1536                  * userspace code converted context=blah to just blah so we are
1537                  * converting back to the full string selinux understands.
1538                  */
1539                 if (data->context[0]){
1540 #ifdef CONFIG_SECURITY_SELINUX
1541                         int rc;
1542                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1543                         if (!opts_str)
1544                                 return -ENOMEM;
1545                         strcpy(opts_str, "context=");
1546                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1547                         strcat(opts_str, &data->context[0]);
1548                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1549                         kfree(opts_str);
1550                         if (rc)
1551                                 return rc;
1552 #else
1553                         return -EINVAL;
1554 #endif
1555                 }
1556
1557                 break;
1558         default: {
1559                 int status;
1560
1561                 if (nfs_parse_mount_options((char *)options, args) == 0)
1562                         return -EINVAL;
1563
1564                 if (!nfs_verify_server_address((struct sockaddr *)
1565                                                 &args->nfs_server.address))
1566                         goto out_no_address;
1567
1568                 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1569                                 args->nfs_server.port);
1570
1571                 nfs_set_mount_transport_protocol(args);
1572
1573                 status = nfs_parse_devname(dev_name,
1574                                            &args->nfs_server.hostname,
1575                                            PAGE_SIZE,
1576                                            &args->nfs_server.export_path,
1577                                            NFS_MAXPATHLEN);
1578                 if (!status)
1579                         status = nfs_try_mount(args, mntfh);
1580
1581                 kfree(args->nfs_server.export_path);
1582                 args->nfs_server.export_path = NULL;
1583
1584                 if (status)
1585                         return status;
1586
1587                 break;
1588                 }
1589         }
1590
1591         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1592                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1593
1594 #ifndef CONFIG_NFS_V3
1595         if (args->flags & NFS_MOUNT_VER3)
1596                 goto out_v3_not_compiled;
1597 #endif /* !CONFIG_NFS_V3 */
1598
1599         return 0;
1600
1601 out_no_data:
1602         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1603         return -EINVAL;
1604
1605 out_no_v3:
1606         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1607                  data->version);
1608         return -EINVAL;
1609
1610 out_no_sec:
1611         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1612         return -EINVAL;
1613
1614 #ifndef CONFIG_NFS_V3
1615 out_v3_not_compiled:
1616         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1617         return -EPROTONOSUPPORT;
1618 #endif /* !CONFIG_NFS_V3 */
1619
1620 out_nomem:
1621         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1622         return -ENOMEM;
1623
1624 out_no_address:
1625         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1626         return -EINVAL;
1627
1628 out_invalid_fh:
1629         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1630         return -EINVAL;
1631 }
1632
1633 static int
1634 nfs_compare_remount_data(struct nfs_server *nfss,
1635                          struct nfs_parsed_mount_data *data)
1636 {
1637         if (data->flags != nfss->flags ||
1638             data->rsize != nfss->rsize ||
1639             data->wsize != nfss->wsize ||
1640             data->retrans != nfss->client->cl_timeout->to_retries ||
1641             data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1642             data->acregmin != nfss->acregmin / HZ ||
1643             data->acregmax != nfss->acregmax / HZ ||
1644             data->acdirmin != nfss->acdirmin / HZ ||
1645             data->acdirmax != nfss->acdirmax / HZ ||
1646             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1647             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1648             memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1649                    data->nfs_server.addrlen) != 0)
1650                 return -EINVAL;
1651
1652         return 0;
1653 }
1654
1655 static int
1656 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1657 {
1658         int error;
1659         struct nfs_server *nfss = sb->s_fs_info;
1660         struct nfs_parsed_mount_data *data;
1661         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1662         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1663         u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1664
1665         /*
1666          * Userspace mount programs that send binary options generally send
1667          * them populated with default values. We have no way to know which
1668          * ones were explicitly specified. Fall back to legacy behavior and
1669          * just return success.
1670          */
1671         if ((nfsvers == 4 && options4->version == 1) ||
1672             (nfsvers <= 3 && options->version >= 1 &&
1673              options->version <= 6))
1674                 return 0;
1675
1676         data = kzalloc(sizeof(*data), GFP_KERNEL);
1677         if (data == NULL)
1678                 return -ENOMEM;
1679
1680         /* fill out struct with values from existing mount */
1681         data->flags = nfss->flags;
1682         data->rsize = nfss->rsize;
1683         data->wsize = nfss->wsize;
1684         data->retrans = nfss->client->cl_timeout->to_retries;
1685         data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1686         data->acregmin = nfss->acregmin / HZ;
1687         data->acregmax = nfss->acregmax / HZ;
1688         data->acdirmin = nfss->acdirmin / HZ;
1689         data->acdirmax = nfss->acdirmax / HZ;
1690         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1691         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1692         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1693                 data->nfs_server.addrlen);
1694
1695         /* overwrite those values with any that were specified */
1696         error = nfs_parse_mount_options((char *)options, data);
1697         if (error < 0)
1698                 goto out;
1699
1700         /* compare new mount options with old ones */
1701         error = nfs_compare_remount_data(nfss, data);
1702 out:
1703         kfree(data);
1704         return error;
1705 }
1706
1707 /*
1708  * Initialise the common bits of the superblock
1709  */
1710 static inline void nfs_initialise_sb(struct super_block *sb)
1711 {
1712         struct nfs_server *server = NFS_SB(sb);
1713
1714         sb->s_magic = NFS_SUPER_MAGIC;
1715
1716         /* We probably want something more informative here */
1717         snprintf(sb->s_id, sizeof(sb->s_id),
1718                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1719
1720         if (sb->s_blocksize == 0)
1721                 sb->s_blocksize = nfs_block_bits(server->wsize,
1722                                                  &sb->s_blocksize_bits);
1723
1724         if (server->flags & NFS_MOUNT_NOAC)
1725                 sb->s_flags |= MS_SYNCHRONOUS;
1726
1727         nfs_super_set_maxbytes(sb, server->maxfilesize);
1728 }
1729
1730 /*
1731  * Finish setting up an NFS2/3 superblock
1732  */
1733 static void nfs_fill_super(struct super_block *sb,
1734                            struct nfs_parsed_mount_data *data)
1735 {
1736         struct nfs_server *server = NFS_SB(sb);
1737
1738         sb->s_blocksize_bits = 0;
1739         sb->s_blocksize = 0;
1740         if (data->bsize)
1741                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1742
1743         if (server->flags & NFS_MOUNT_VER3) {
1744                 /* The VFS shouldn't apply the umask to mode bits. We will do
1745                  * so ourselves when necessary.
1746                  */
1747                 sb->s_flags |= MS_POSIXACL;
1748                 sb->s_time_gran = 1;
1749         }
1750
1751         sb->s_op = &nfs_sops;
1752         nfs_initialise_sb(sb);
1753 }
1754
1755 /*
1756  * Finish setting up a cloned NFS2/3 superblock
1757  */
1758 static void nfs_clone_super(struct super_block *sb,
1759                             const struct super_block *old_sb)
1760 {
1761         struct nfs_server *server = NFS_SB(sb);
1762
1763         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1764         sb->s_blocksize = old_sb->s_blocksize;
1765         sb->s_maxbytes = old_sb->s_maxbytes;
1766
1767         if (server->flags & NFS_MOUNT_VER3) {
1768                 /* The VFS shouldn't apply the umask to mode bits. We will do
1769                  * so ourselves when necessary.
1770                  */
1771                 sb->s_flags |= MS_POSIXACL;
1772                 sb->s_time_gran = 1;
1773         }
1774
1775         sb->s_op = old_sb->s_op;
1776         nfs_initialise_sb(sb);
1777 }
1778
1779 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1780
1781 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1782 {
1783         const struct nfs_server *a = s->s_fs_info;
1784         const struct rpc_clnt *clnt_a = a->client;
1785         const struct rpc_clnt *clnt_b = b->client;
1786
1787         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1788                 goto Ebusy;
1789         if (a->nfs_client != b->nfs_client)
1790                 goto Ebusy;
1791         if (a->flags != b->flags)
1792                 goto Ebusy;
1793         if (a->wsize != b->wsize)
1794                 goto Ebusy;
1795         if (a->rsize != b->rsize)
1796                 goto Ebusy;
1797         if (a->acregmin != b->acregmin)
1798                 goto Ebusy;
1799         if (a->acregmax != b->acregmax)
1800                 goto Ebusy;
1801         if (a->acdirmin != b->acdirmin)
1802                 goto Ebusy;
1803         if (a->acdirmax != b->acdirmax)
1804                 goto Ebusy;
1805         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1806                 goto Ebusy;
1807         return 1;
1808 Ebusy:
1809         return 0;
1810 }
1811
1812 struct nfs_sb_mountdata {
1813         struct nfs_server *server;
1814         int mntflags;
1815 };
1816
1817 static int nfs_set_super(struct super_block *s, void *data)
1818 {
1819         struct nfs_sb_mountdata *sb_mntdata = data;
1820         struct nfs_server *server = sb_mntdata->server;
1821         int ret;
1822
1823         s->s_flags = sb_mntdata->mntflags;
1824         s->s_fs_info = server;
1825         ret = set_anon_super(s, server);
1826         if (ret == 0)
1827                 server->s_dev = s->s_dev;
1828         return ret;
1829 }
1830
1831 static int nfs_compare_super_address(struct nfs_server *server1,
1832                                      struct nfs_server *server2)
1833 {
1834         struct sockaddr *sap1, *sap2;
1835
1836         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1837         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1838
1839         if (sap1->sa_family != sap2->sa_family)
1840                 return 0;
1841
1842         switch (sap1->sa_family) {
1843         case AF_INET: {
1844                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1845                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1846                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1847                         return 0;
1848                 if (sin1->sin_port != sin2->sin_port)
1849                         return 0;
1850                 break;
1851         }
1852         case AF_INET6: {
1853                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1854                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1855                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1856                         return 0;
1857                 if (sin1->sin6_port != sin2->sin6_port)
1858                         return 0;
1859                 break;
1860         }
1861         default:
1862                 return 0;
1863         }
1864
1865         return 1;
1866 }
1867
1868 static int nfs_compare_super(struct super_block *sb, void *data)
1869 {
1870         struct nfs_sb_mountdata *sb_mntdata = data;
1871         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1872         int mntflags = sb_mntdata->mntflags;
1873
1874         if (!nfs_compare_super_address(old, server))
1875                 return 0;
1876         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1877         if (old->flags & NFS_MOUNT_UNSHARED)
1878                 return 0;
1879         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1880                 return 0;
1881         return nfs_compare_mount_options(sb, server, mntflags);
1882 }
1883
1884 static int nfs_bdi_register(struct nfs_server *server)
1885 {
1886         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1887 }
1888
1889 static int nfs_get_sb(struct file_system_type *fs_type,
1890         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1891 {
1892         struct nfs_server *server = NULL;
1893         struct super_block *s;
1894         struct nfs_parsed_mount_data *data;
1895         struct nfs_fh *mntfh;
1896         struct dentry *mntroot;
1897         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1898         struct nfs_sb_mountdata sb_mntdata = {
1899                 .mntflags = flags,
1900         };
1901         int error = -ENOMEM;
1902
1903         data = kzalloc(sizeof(*data), GFP_KERNEL);
1904         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1905         if (data == NULL || mntfh == NULL)
1906                 goto out_free_fh;
1907
1908         security_init_mnt_opts(&data->lsm_opts);
1909
1910         /* Validate the mount data */
1911         error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1912         if (error < 0)
1913                 goto out;
1914
1915         /* Get a volume representation */
1916         server = nfs_create_server(data, mntfh);
1917         if (IS_ERR(server)) {
1918                 error = PTR_ERR(server);
1919                 goto out;
1920         }
1921         sb_mntdata.server = server;
1922
1923         if (server->flags & NFS_MOUNT_UNSHARED)
1924                 compare_super = NULL;
1925
1926         /* Get a superblock - note that we may end up sharing one that already exists */
1927         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1928         if (IS_ERR(s)) {
1929                 error = PTR_ERR(s);
1930                 goto out_err_nosb;
1931         }
1932
1933         if (s->s_fs_info != server) {
1934                 nfs_free_server(server);
1935                 server = NULL;
1936         } else {
1937                 error = nfs_bdi_register(server);
1938                 if (error)
1939                         goto error_splat_super;
1940         }
1941
1942         if (!s->s_root) {
1943                 /* initial superblock/root creation */
1944                 nfs_fill_super(s, data);
1945         }
1946
1947         mntroot = nfs_get_root(s, mntfh);
1948         if (IS_ERR(mntroot)) {
1949                 error = PTR_ERR(mntroot);
1950                 goto error_splat_super;
1951         }
1952
1953         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1954         if (error)
1955                 goto error_splat_root;
1956
1957         s->s_flags |= MS_ACTIVE;
1958         mnt->mnt_sb = s;
1959         mnt->mnt_root = mntroot;
1960         error = 0;
1961
1962 out:
1963         kfree(data->nfs_server.hostname);
1964         kfree(data->mount_server.hostname);
1965         security_free_mnt_opts(&data->lsm_opts);
1966 out_free_fh:
1967         kfree(mntfh);
1968         kfree(data);
1969         return error;
1970
1971 out_err_nosb:
1972         nfs_free_server(server);
1973         goto out;
1974
1975 error_splat_root:
1976         dput(mntroot);
1977 error_splat_super:
1978         up_write(&s->s_umount);
1979         deactivate_super(s);
1980         goto out;
1981 }
1982
1983 /*
1984  * Destroy an NFS2/3 superblock
1985  */
1986 static void nfs_kill_super(struct super_block *s)
1987 {
1988         struct nfs_server *server = NFS_SB(s);
1989
1990         bdi_unregister(&server->backing_dev_info);
1991         kill_anon_super(s);
1992         nfs_free_server(server);
1993 }
1994
1995 /*
1996  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1997  */
1998 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1999                            const char *dev_name, void *raw_data,
2000                            struct vfsmount *mnt)
2001 {
2002         struct nfs_clone_mount *data = raw_data;
2003         struct super_block *s;
2004         struct nfs_server *server;
2005         struct dentry *mntroot;
2006         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2007         struct nfs_sb_mountdata sb_mntdata = {
2008                 .mntflags = flags,
2009         };
2010         int error;
2011
2012         dprintk("--> nfs_xdev_get_sb()\n");
2013
2014         /* create a new volume representation */
2015         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2016         if (IS_ERR(server)) {
2017                 error = PTR_ERR(server);
2018                 goto out_err_noserver;
2019         }
2020         sb_mntdata.server = server;
2021
2022         if (server->flags & NFS_MOUNT_UNSHARED)
2023                 compare_super = NULL;
2024
2025         /* Get a superblock - note that we may end up sharing one that already exists */
2026         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2027         if (IS_ERR(s)) {
2028                 error = PTR_ERR(s);
2029                 goto out_err_nosb;
2030         }
2031
2032         if (s->s_fs_info != server) {
2033                 nfs_free_server(server);
2034                 server = NULL;
2035         } else {
2036                 error = nfs_bdi_register(server);
2037                 if (error)
2038                         goto error_splat_super;
2039         }
2040
2041         if (!s->s_root) {
2042                 /* initial superblock/root creation */
2043                 nfs_clone_super(s, data->sb);
2044         }
2045
2046         mntroot = nfs_get_root(s, data->fh);
2047         if (IS_ERR(mntroot)) {
2048                 error = PTR_ERR(mntroot);
2049                 goto error_splat_super;
2050         }
2051         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2052                 dput(mntroot);
2053                 error = -ESTALE;
2054                 goto error_splat_super;
2055         }
2056
2057         s->s_flags |= MS_ACTIVE;
2058         mnt->mnt_sb = s;
2059         mnt->mnt_root = mntroot;
2060
2061         /* clone any lsm security options from the parent to the new sb */
2062         security_sb_clone_mnt_opts(data->sb, s);
2063
2064         dprintk("<-- nfs_xdev_get_sb() = 0\n");
2065         return 0;
2066
2067 out_err_nosb:
2068         nfs_free_server(server);
2069 out_err_noserver:
2070         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2071         return error;
2072
2073 error_splat_super:
2074         up_write(&s->s_umount);
2075         deactivate_super(s);
2076         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2077         return error;
2078 }
2079
2080 #ifdef CONFIG_NFS_V4
2081
2082 /*
2083  * Finish setting up a cloned NFS4 superblock
2084  */
2085 static void nfs4_clone_super(struct super_block *sb,
2086                             const struct super_block *old_sb)
2087 {
2088         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2089         sb->s_blocksize = old_sb->s_blocksize;
2090         sb->s_maxbytes = old_sb->s_maxbytes;
2091         sb->s_time_gran = 1;
2092         sb->s_op = old_sb->s_op;
2093         nfs_initialise_sb(sb);
2094 }
2095
2096 /*
2097  * Set up an NFS4 superblock
2098  */
2099 static void nfs4_fill_super(struct super_block *sb)
2100 {
2101         sb->s_time_gran = 1;
2102         sb->s_op = &nfs4_sops;
2103         nfs_initialise_sb(sb);
2104 }
2105
2106 /*
2107  * Validate NFSv4 mount options
2108  */
2109 static int nfs4_validate_mount_data(void *options,
2110                                     struct nfs_parsed_mount_data *args,
2111                                     const char *dev_name)
2112 {
2113         struct sockaddr_in *ap;
2114         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2115         char *c;
2116
2117         if (data == NULL)
2118                 goto out_no_data;
2119
2120         args->rsize             = NFS_MAX_FILE_IO_SIZE;
2121         args->wsize             = NFS_MAX_FILE_IO_SIZE;
2122         args->acregmin          = NFS_DEF_ACREGMIN;
2123         args->acregmax          = NFS_DEF_ACREGMAX;
2124         args->acdirmin          = NFS_DEF_ACDIRMIN;
2125         args->acdirmax          = NFS_DEF_ACDIRMAX;
2126         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
2127
2128         switch (data->version) {
2129         case 1:
2130                 ap = (struct sockaddr_in *)&args->nfs_server.address;
2131                 if (data->host_addrlen > sizeof(args->nfs_server.address))
2132                         goto out_no_address;
2133                 if (data->host_addrlen == 0)
2134                         goto out_no_address;
2135                 args->nfs_server.addrlen = data->host_addrlen;
2136                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2137                         return -EFAULT;
2138                 if (!nfs_verify_server_address((struct sockaddr *)
2139                                                 &args->nfs_server.address))
2140                         goto out_no_address;
2141
2142                 switch (data->auth_flavourlen) {
2143                 case 0:
2144                         args->auth_flavors[0] = RPC_AUTH_UNIX;
2145                         break;
2146                 case 1:
2147                         if (copy_from_user(&args->auth_flavors[0],
2148                                            data->auth_flavours,
2149                                            sizeof(args->auth_flavors[0])))
2150                                 return -EFAULT;
2151                         break;
2152                 default:
2153                         goto out_inval_auth;
2154                 }
2155
2156                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2157                 if (IS_ERR(c))
2158                         return PTR_ERR(c);
2159                 args->nfs_server.hostname = c;
2160
2161                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2162                 if (IS_ERR(c))
2163                         return PTR_ERR(c);
2164                 args->nfs_server.export_path = c;
2165                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2166
2167                 c = strndup_user(data->client_addr.data, 16);
2168                 if (IS_ERR(c))
2169                         return PTR_ERR(c);
2170                 args->client_address = c;
2171
2172                 /*
2173                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2174                  * can deal with.
2175                  */
2176
2177                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
2178                 args->rsize     = data->rsize;
2179                 args->wsize     = data->wsize;
2180                 args->timeo     = data->timeo;
2181                 args->retrans   = data->retrans;
2182                 args->acregmin  = data->acregmin;
2183                 args->acregmax  = data->acregmax;
2184                 args->acdirmin  = data->acdirmin;
2185                 args->acdirmax  = data->acdirmax;
2186                 args->nfs_server.protocol = data->proto;
2187                 nfs_validate_transport_protocol(args);
2188
2189                 break;
2190         default: {
2191                 int status;
2192
2193                 if (nfs_parse_mount_options((char *)options, args) == 0)
2194                         return -EINVAL;
2195
2196                 if (!nfs_verify_server_address((struct sockaddr *)
2197                                                 &args->nfs_server.address))
2198                         return -EINVAL;
2199
2200                 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2201                                 args->nfs_server.port);
2202
2203                 nfs_validate_transport_protocol(args);
2204
2205                 switch (args->auth_flavor_len) {
2206                 case 0:
2207                         args->auth_flavors[0] = RPC_AUTH_UNIX;
2208                         break;
2209                 case 1:
2210                         break;
2211                 default:
2212                         goto out_inval_auth;
2213                 }
2214
2215                 if (args->client_address == NULL)
2216                         goto out_no_client_address;
2217
2218                 status = nfs_parse_devname(dev_name,
2219                                            &args->nfs_server.hostname,
2220                                            NFS4_MAXNAMLEN,
2221                                            &args->nfs_server.export_path,
2222                                            NFS4_MAXPATHLEN);
2223                 if (status < 0)
2224                         return status;
2225
2226                 break;
2227                 }
2228         }
2229
2230         return 0;
2231
2232 out_no_data:
2233         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2234         return -EINVAL;
2235
2236 out_inval_auth:
2237         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2238                  data->auth_flavourlen);
2239         return -EINVAL;
2240
2241 out_no_address:
2242         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2243         return -EINVAL;
2244
2245 out_no_client_address:
2246         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2247         return -EINVAL;
2248 }
2249
2250 /*
2251  * Get the superblock for an NFS4 mountpoint
2252  */
2253 static int nfs4_get_sb(struct file_system_type *fs_type,
2254         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2255 {
2256         struct nfs_parsed_mount_data *data;
2257         struct super_block *s;
2258         struct nfs_server *server;
2259         struct nfs_fh *mntfh;
2260         struct dentry *mntroot;
2261         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2262         struct nfs_sb_mountdata sb_mntdata = {
2263                 .mntflags = flags,
2264         };
2265         int error = -ENOMEM;
2266
2267         data = kzalloc(sizeof(*data), GFP_KERNEL);
2268         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2269         if (data == NULL || mntfh == NULL)
2270                 goto out_free_fh;
2271
2272         security_init_mnt_opts(&data->lsm_opts);
2273
2274         /* Validate the mount data */
2275         error = nfs4_validate_mount_data(raw_data, data, dev_name);
2276         if (error < 0)
2277                 goto out;
2278
2279         /* Get a volume representation */
2280         server = nfs4_create_server(data, mntfh);
2281         if (IS_ERR(server)) {
2282                 error = PTR_ERR(server);
2283                 goto out;
2284         }
2285         sb_mntdata.server = server;
2286
2287         if (server->flags & NFS4_MOUNT_UNSHARED)
2288                 compare_super = NULL;
2289
2290         /* Get a superblock - note that we may end up sharing one that already exists */
2291         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2292         if (IS_ERR(s)) {
2293                 error = PTR_ERR(s);
2294                 goto out_free;
2295         }
2296
2297         if (s->s_fs_info != server) {
2298                 nfs_free_server(server);
2299                 server = NULL;
2300         } else {
2301                 error = nfs_bdi_register(server);
2302                 if (error)
2303                         goto error_splat_super;
2304         }
2305
2306         if (!s->s_root) {
2307                 /* initial superblock/root creation */
2308                 nfs4_fill_super(s);
2309         }
2310
2311         mntroot = nfs4_get_root(s, mntfh);
2312         if (IS_ERR(mntroot)) {
2313                 error = PTR_ERR(mntroot);
2314                 goto error_splat_super;
2315         }
2316
2317         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2318         if (error)
2319                 goto error_splat_root;
2320
2321         s->s_flags |= MS_ACTIVE;
2322         mnt->mnt_sb = s;
2323         mnt->mnt_root = mntroot;
2324         error = 0;
2325
2326 out:
2327         kfree(data->client_address);
2328         kfree(data->nfs_server.export_path);
2329         kfree(data->nfs_server.hostname);
2330         security_free_mnt_opts(&data->lsm_opts);
2331 out_free_fh:
2332         kfree(mntfh);
2333         kfree(data);
2334         return error;
2335
2336 out_free:
2337         nfs_free_server(server);
2338         goto out;
2339
2340 error_splat_root:
2341         dput(mntroot);
2342 error_splat_super:
2343         up_write(&s->s_umount);
2344         deactivate_super(s);
2345         goto out;
2346 }
2347
2348 static void nfs4_kill_super(struct super_block *sb)
2349 {
2350         struct nfs_server *server = NFS_SB(sb);
2351
2352         nfs_return_all_delegations(sb);
2353         kill_anon_super(sb);
2354
2355         nfs4_renewd_prepare_shutdown(server);
2356         nfs_free_server(server);
2357 }
2358
2359 /*
2360  * Clone an NFS4 server record on xdev traversal (FSID-change)
2361  */
2362 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2363                             const char *dev_name, void *raw_data,
2364                             struct vfsmount *mnt)
2365 {
2366         struct nfs_clone_mount *data = raw_data;
2367         struct super_block *s;
2368         struct nfs_server *server;
2369         struct dentry *mntroot;
2370         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2371         struct nfs_sb_mountdata sb_mntdata = {
2372                 .mntflags = flags,
2373         };
2374         int error;
2375
2376         dprintk("--> nfs4_xdev_get_sb()\n");
2377
2378         /* create a new volume representation */
2379         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2380         if (IS_ERR(server)) {
2381                 error = PTR_ERR(server);
2382                 goto out_err_noserver;
2383         }
2384         sb_mntdata.server = server;
2385
2386         if (server->flags & NFS4_MOUNT_UNSHARED)
2387                 compare_super = NULL;
2388
2389         /* Get a superblock - note that we may end up sharing one that already exists */
2390         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2391         if (IS_ERR(s)) {
2392                 error = PTR_ERR(s);
2393                 goto out_err_nosb;
2394         }
2395
2396         if (s->s_fs_info != server) {
2397                 nfs_free_server(server);
2398                 server = NULL;
2399         } else {
2400                 error = nfs_bdi_register(server);
2401                 if (error)
2402                         goto error_splat_super;
2403         }
2404
2405         if (!s->s_root) {
2406                 /* initial superblock/root creation */
2407                 nfs4_clone_super(s, data->sb);
2408         }
2409
2410         mntroot = nfs4_get_root(s, data->fh);
2411         if (IS_ERR(mntroot)) {
2412                 error = PTR_ERR(mntroot);
2413                 goto error_splat_super;
2414         }
2415         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2416                 dput(mntroot);
2417                 error = -ESTALE;
2418                 goto error_splat_super;
2419         }
2420
2421         s->s_flags |= MS_ACTIVE;
2422         mnt->mnt_sb = s;
2423         mnt->mnt_root = mntroot;
2424
2425         security_sb_clone_mnt_opts(data->sb, s);
2426
2427         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2428         return 0;
2429
2430 out_err_nosb:
2431         nfs_free_server(server);
2432 out_err_noserver:
2433         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2434         return error;
2435
2436 error_splat_super:
2437         up_write(&s->s_umount);
2438         deactivate_super(s);
2439         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2440         return error;
2441 }
2442
2443 /*
2444  * Create an NFS4 server record on referral traversal
2445  */
2446 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2447                                 const char *dev_name, void *raw_data,
2448                                 struct vfsmount *mnt)
2449 {
2450         struct nfs_clone_mount *data = raw_data;
2451         struct super_block *s;
2452         struct nfs_server *server;
2453         struct dentry *mntroot;
2454         struct nfs_fh mntfh;
2455         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2456         struct nfs_sb_mountdata sb_mntdata = {
2457                 .mntflags = flags,
2458         };
2459         int error;
2460
2461         dprintk("--> nfs4_referral_get_sb()\n");
2462
2463         /* create a new volume representation */
2464         server = nfs4_create_referral_server(data, &mntfh);
2465         if (IS_ERR(server)) {
2466                 error = PTR_ERR(server);
2467                 goto out_err_noserver;
2468         }
2469         sb_mntdata.server = server;
2470
2471         if (server->flags & NFS4_MOUNT_UNSHARED)
2472                 compare_super = NULL;
2473
2474         /* Get a superblock - note that we may end up sharing one that already exists */
2475         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2476         if (IS_ERR(s)) {
2477                 error = PTR_ERR(s);
2478                 goto out_err_nosb;
2479         }
2480
2481         if (s->s_fs_info != server) {
2482                 nfs_free_server(server);
2483                 server = NULL;
2484         } else {
2485                 error = nfs_bdi_register(server);
2486                 if (error)
2487                         goto error_splat_super;
2488         }
2489
2490         if (!s->s_root) {
2491                 /* initial superblock/root creation */
2492                 nfs4_fill_super(s);
2493         }
2494
2495         mntroot = nfs4_get_root(s, &mntfh);
2496         if (IS_ERR(mntroot)) {
2497                 error = PTR_ERR(mntroot);
2498                 goto error_splat_super;
2499         }
2500         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2501                 dput(mntroot);
2502                 error = -ESTALE;
2503                 goto error_splat_super;
2504         }
2505
2506         s->s_flags |= MS_ACTIVE;
2507         mnt->mnt_sb = s;
2508         mnt->mnt_root = mntroot;
2509
2510         security_sb_clone_mnt_opts(data->sb, s);
2511
2512         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2513         return 0;
2514
2515 out_err_nosb:
2516         nfs_free_server(server);
2517 out_err_noserver:
2518         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2519         return error;
2520
2521 error_splat_super:
2522         up_write(&s->s_umount);
2523         deactivate_super(s);
2524         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2525         return error;
2526 }
2527
2528 #endif /* CONFIG_NFS_V4 */