Pileus Git - ~andy/linux/blob - fs/nfs/super.c

   1 /*
   2  *  linux/fs/nfs/super.c
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  nfs superblock handling functions
   7  *
   8  *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
   9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10  *
  11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12  *  J.S.Peatfield@damtp.cam.ac.uk
  13  *
  14  *  Split from inode.c by David Howells <dhowells@redhat.com>
  15  *
  16  * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
  17  *   particular server are held in the same superblock
  18  * - NFS superblocks can have several effective roots to the dentry tree
  19  * - directory type roots are spliced into the tree when a path from one root reaches the root
  20  *   of another (see nfs_lookup())
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25
  26 #include <linux/time.h>
  27 #include <linux/kernel.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/stat.h>
  31 #include <linux/errno.h>
  32 #include <linux/unistd.h>
  33 #include <linux/sunrpc/clnt.h>
  34 #include <linux/sunrpc/stats.h>
  35 #include <linux/sunrpc/metrics.h>
  36 #include <linux/sunrpc/xprtsock.h>
  37 #include <linux/sunrpc/xprtrdma.h>
  38 #include <linux/nfs_fs.h>
  39 #include <linux/nfs_mount.h>
  40 #include <linux/nfs4_mount.h>
  41 #include <linux/lockd/bind.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/mount.h>
  45 #include <linux/nfs_idmap.h>
  46 #include <linux/vfs.h>
  47 #include <linux/inet.h>
  48 #include <linux/in6.h>
  49 #include <net/ipv6.h>
  50 #include <linux/nfs_xdr.h>
  51 #include <linux/magic.h>
  52 #include <linux/parser.h>
  53
  54 #include <asm/system.h>
  55 #include <asm/uaccess.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "callback.h"
  59 #include "delegation.h"
  60 #include "iostat.h"
  61 #include "internal.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_VFS
  64
  65 enum {
  66         /* Mount options that take no arguments */
  67         Opt_soft, Opt_hard,
  68         Opt_intr, Opt_nointr,
  69         Opt_posix, Opt_noposix,
  70         Opt_cto, Opt_nocto,
  71         Opt_ac, Opt_noac,
  72         Opt_lock, Opt_nolock,
  73         Opt_v2, Opt_v3,
  74         Opt_udp, Opt_tcp, Opt_rdma,
  75         Opt_acl, Opt_noacl,
  76         Opt_rdirplus, Opt_nordirplus,
  77         Opt_sharecache, Opt_nosharecache,
  78
  79         /* Mount options that take integer arguments */
  80         Opt_port,
  81         Opt_rsize, Opt_wsize, Opt_bsize,
  82         Opt_timeo, Opt_retrans,
  83         Opt_acregmin, Opt_acregmax,
  84         Opt_acdirmin, Opt_acdirmax,
  85         Opt_actimeo,
  86         Opt_namelen,
  87         Opt_mountport,
  88         Opt_mountvers,
  89         Opt_nfsvers,
  90
  91         /* Mount options that take string arguments */
  92         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
  93         Opt_addr, Opt_mountaddr, Opt_clientaddr,
  94
  95         /* Mount options that are ignored */
  96         Opt_userspace, Opt_deprecated,
  97
  98         Opt_err
  99 };
 100
 101 static match_table_t nfs_mount_option_tokens = {
 102         { Opt_userspace, "bg" },
 103         { Opt_userspace, "fg" },
 104         { Opt_soft, "soft" },
 105         { Opt_hard, "hard" },
 106         { Opt_intr, "intr" },
 107         { Opt_nointr, "nointr" },
 108         { Opt_posix, "posix" },
 109         { Opt_noposix, "noposix" },
 110         { Opt_cto, "cto" },
 111         { Opt_nocto, "nocto" },
 112         { Opt_ac, "ac" },
 113         { Opt_noac, "noac" },
 114         { Opt_lock, "lock" },
 115         { Opt_nolock, "nolock" },
 116         { Opt_v2, "v2" },
 117         { Opt_v3, "v3" },
 118         { Opt_udp, "udp" },
 119         { Opt_tcp, "tcp" },
 120         { Opt_rdma, "rdma" },
 121         { Opt_acl, "acl" },
 122         { Opt_noacl, "noacl" },
 123         { Opt_rdirplus, "rdirplus" },
 124         { Opt_nordirplus, "nordirplus" },
 125         { Opt_sharecache, "sharecache" },
 126         { Opt_nosharecache, "nosharecache" },
 127
 128         { Opt_port, "port=%u" },
 129         { Opt_rsize, "rsize=%u" },
 130         { Opt_wsize, "wsize=%u" },
 131         { Opt_bsize, "bsize=%u" },
 132         { Opt_timeo, "timeo=%u" },
 133         { Opt_retrans, "retrans=%u" },
 134         { Opt_acregmin, "acregmin=%u" },
 135         { Opt_acregmax, "acregmax=%u" },
 136         { Opt_acdirmin, "acdirmin=%u" },
 137         { Opt_acdirmax, "acdirmax=%u" },
 138         { Opt_actimeo, "actimeo=%u" },
 139         { Opt_userspace, "retry=%u" },
 140         { Opt_namelen, "namlen=%u" },
 141         { Opt_mountport, "mountport=%u" },
 142         { Opt_mountvers, "mountvers=%u" },
 143         { Opt_nfsvers, "nfsvers=%u" },
 144         { Opt_nfsvers, "vers=%u" },
 145
 146         { Opt_sec, "sec=%s" },
 147         { Opt_proto, "proto=%s" },
 148         { Opt_mountproto, "mountproto=%s" },
 149         { Opt_addr, "addr=%s" },
 150         { Opt_clientaddr, "clientaddr=%s" },
 151         { Opt_mounthost, "mounthost=%s" },
 152         { Opt_mountaddr, "mountaddr=%s" },
 153
 154         { Opt_err, NULL }
 155 };
 156
 157 enum {
 158         Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 159
 160         Opt_xprt_err
 161 };
 162
 163 static match_table_t nfs_xprt_protocol_tokens = {
 164         { Opt_xprt_udp, "udp" },
 165         { Opt_xprt_tcp, "tcp" },
 166         { Opt_xprt_rdma, "rdma" },
 167
 168         { Opt_xprt_err, NULL }
 169 };
 170
 171 enum {
 172         Opt_sec_none, Opt_sec_sys,
 173         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 174         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 175         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 176
 177         Opt_sec_err
 178 };
 179
 180 static match_table_t nfs_secflavor_tokens = {
 181         { Opt_sec_none, "none" },
 182         { Opt_sec_none, "null" },
 183         { Opt_sec_sys, "sys" },
 184
 185         { Opt_sec_krb5, "krb5" },
 186         { Opt_sec_krb5i, "krb5i" },
 187         { Opt_sec_krb5p, "krb5p" },
 188
 189         { Opt_sec_lkey, "lkey" },
 190         { Opt_sec_lkeyi, "lkeyi" },
 191         { Opt_sec_lkeyp, "lkeyp" },
 192
 193         { Opt_sec_spkm, "spkm3" },
 194         { Opt_sec_spkmi, "spkm3i" },
 195         { Opt_sec_spkmp, "spkm3p" },
 196
 197         { Opt_sec_err, NULL }
 198 };
 199
 200
 201 static void nfs_umount_begin(struct vfsmount *, int);
 202 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 203 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
 204 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
 205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
 206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
 207                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 208 static void nfs_kill_super(struct super_block *);
 209 static void nfs_put_super(struct super_block *);
 210
 211 static struct file_system_type nfs_fs_type = {
 212         .owner          = THIS_MODULE,
 213         .name           = "nfs",
 214         .get_sb         = nfs_get_sb,
 215         .kill_sb        = nfs_kill_super,
 216         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 217 };
 218
 219 struct file_system_type nfs_xdev_fs_type = {
 220         .owner          = THIS_MODULE,
 221         .name           = "nfs",
 222         .get_sb         = nfs_xdev_get_sb,
 223         .kill_sb        = nfs_kill_super,
 224         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 225 };
 226
 227 static const struct super_operations nfs_sops = {
 228         .alloc_inode    = nfs_alloc_inode,
 229         .destroy_inode  = nfs_destroy_inode,
 230         .write_inode    = nfs_write_inode,
 231         .put_super      = nfs_put_super,
 232         .statfs         = nfs_statfs,
 233         .clear_inode    = nfs_clear_inode,
 234         .umount_begin   = nfs_umount_begin,
 235         .show_options   = nfs_show_options,
 236         .show_stats     = nfs_show_stats,
 237 };
 238
 239 #ifdef CONFIG_NFS_V4
 240 static int nfs4_get_sb(struct file_system_type *fs_type,
 241         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 242 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
 243         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 244 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 246 static void nfs4_kill_super(struct super_block *sb);
 247
 248 static struct file_system_type nfs4_fs_type = {
 249         .owner          = THIS_MODULE,
 250         .name           = "nfs4",
 251         .get_sb         = nfs4_get_sb,
 252         .kill_sb        = nfs4_kill_super,
 253         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 254 };
 255
 256 struct file_system_type nfs4_xdev_fs_type = {
 257         .owner          = THIS_MODULE,
 258         .name           = "nfs4",
 259         .get_sb         = nfs4_xdev_get_sb,
 260         .kill_sb        = nfs4_kill_super,
 261         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 262 };
 263
 264 struct file_system_type nfs4_referral_fs_type = {
 265         .owner          = THIS_MODULE,
 266         .name           = "nfs4",
 267         .get_sb         = nfs4_referral_get_sb,
 268         .kill_sb        = nfs4_kill_super,
 269         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 270 };
 271
 272 static const struct super_operations nfs4_sops = {
 273         .alloc_inode    = nfs_alloc_inode,
 274         .destroy_inode  = nfs_destroy_inode,
 275         .write_inode    = nfs_write_inode,
 276         .statfs         = nfs_statfs,
 277         .clear_inode    = nfs4_clear_inode,
 278         .umount_begin   = nfs_umount_begin,
 279         .show_options   = nfs_show_options,
 280         .show_stats     = nfs_show_stats,
 281 };
 282 #endif
 283
 284 static struct shrinker acl_shrinker = {
 285         .shrink         = nfs_access_cache_shrinker,
 286         .seeks          = DEFAULT_SEEKS,
 287 };
 288
 289 /*
 290  * Register the NFS filesystems
 291  */
 292 int __init register_nfs_fs(void)
 293 {
 294         int ret;
 295
 296         ret = register_filesystem(&nfs_fs_type);
 297         if (ret < 0)
 298                 goto error_0;
 299
 300         ret = nfs_register_sysctl();
 301         if (ret < 0)
 302                 goto error_1;
 303 #ifdef CONFIG_NFS_V4
 304         ret = register_filesystem(&nfs4_fs_type);
 305         if (ret < 0)
 306                 goto error_2;
 307 #endif
 308         register_shrinker(&acl_shrinker);
 309         return 0;
 310
 311 #ifdef CONFIG_NFS_V4
 312 error_2:
 313         nfs_unregister_sysctl();
 314 #endif
 315 error_1:
 316         unregister_filesystem(&nfs_fs_type);
 317 error_0:
 318         return ret;
 319 }
 320
 321 /*
 322  * Unregister the NFS filesystems
 323  */
 324 void __exit unregister_nfs_fs(void)
 325 {
 326         unregister_shrinker(&acl_shrinker);
 327 #ifdef CONFIG_NFS_V4
 328         unregister_filesystem(&nfs4_fs_type);
 329 #endif
 330         nfs_unregister_sysctl();
 331         unregister_filesystem(&nfs_fs_type);
 332 }
 333
 334 void nfs_sb_active(struct nfs_server *server)
 335 {
 336         atomic_inc(&server->active);
 337 }
 338
 339 void nfs_sb_deactive(struct nfs_server *server)
 340 {
 341         if (atomic_dec_and_test(&server->active))
 342                 wake_up(&server->active_wq);
 343 }
 344
 345 static void nfs_put_super(struct super_block *sb)
 346 {
 347         struct nfs_server *server = NFS_SB(sb);
 348         /*
 349          * Make sure there are no outstanding ops to this server.
 350          * If so, wait for them to finish before allowing the
 351          * unmount to continue.
 352          */
 353         wait_event(server->active_wq, atomic_read(&server->active) == 0);
 354 }
 355
 356 /*
 357  * Deliver file system statistics to userspace
 358  */
 359 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 360 {
 361         struct nfs_server *server = NFS_SB(dentry->d_sb);
 362         unsigned char blockbits;
 363         unsigned long blockres;
 364         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 365         struct nfs_fattr fattr;
 366         struct nfs_fsstat res = {
 367                         .fattr = &fattr,
 368         };
 369         int error;
 370
 371         lock_kernel();
 372
 373         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 374         if (error < 0)
 375                 goto out_err;
 376         buf->f_type = NFS_SUPER_MAGIC;
 377
 378         /*
 379          * Current versions of glibc do not correctly handle the
 380          * case where f_frsize != f_bsize.  Eventually we want to
 381          * report the value of wtmult in this field.
 382          */
 383         buf->f_frsize = dentry->d_sb->s_blocksize;
 384
 385         /*
 386          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 387          * are reported in units of f_frsize.  Linux hasn't had
 388          * an f_frsize field in its statfs struct until recently,
 389          * thus historically Linux's sys_statfs reports these
 390          * fields in units of f_bsize.
 391          */
 392         buf->f_bsize = dentry->d_sb->s_blocksize;
 393         blockbits = dentry->d_sb->s_blocksize_bits;
 394         blockres = (1 << blockbits) - 1;
 395         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 396         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 397         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 398
 399         buf->f_files = res.tfiles;
 400         buf->f_ffree = res.afiles;
 401
 402         buf->f_namelen = server->namelen;
 403
 404         unlock_kernel();
 405         return 0;
 406
 407  out_err:
 408         dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
 409         unlock_kernel();
 410         return error;
 411 }
 412
 413 /*
 414  * Map the security flavour number to a name
 415  */
 416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 417 {
 418         static const struct {
 419                 rpc_authflavor_t flavour;
 420                 const char *str;
 421         } sec_flavours[] = {
 422                 { RPC_AUTH_NULL, "null" },
 423                 { RPC_AUTH_UNIX, "sys" },
 424                 { RPC_AUTH_GSS_KRB5, "krb5" },
 425                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 426                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 427                 { RPC_AUTH_GSS_LKEY, "lkey" },
 428                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 429                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 430                 { RPC_AUTH_GSS_SPKM, "spkm" },
 431                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 432                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 433                 { UINT_MAX, "unknown" }
 434         };
 435         int i;
 436
 437         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 438                 if (sec_flavours[i].flavour == flavour)
 439                         break;
 440         }
 441         return sec_flavours[i].str;
 442 }
 443
 444 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 445                                     int showdefaults)
 446 {
 447         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
 448
 449         switch (sap->sa_family) {
 450         case AF_INET: {
 451                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 452                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
 453                                 NIPQUAD(sin->sin_addr.s_addr));
 454                 break;
 455         }
 456         case AF_INET6: {
 457                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 458                 seq_printf(m, ",mountaddr=" NIP6_FMT,
 459                                 NIP6(sin6->sin6_addr));
 460                 break;
 461         }
 462         default:
 463                 if (showdefaults)
 464                         seq_printf(m, ",mountaddr=unspecified");
 465         }
 466
 467         if (nfss->mountd_version || showdefaults)
 468                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
 469         if (nfss->mountd_port || showdefaults)
 470                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
 471
 472         switch (nfss->mountd_protocol) {
 473         case IPPROTO_UDP:
 474                 seq_printf(m, ",mountproto=udp");
 475                 break;
 476         case IPPROTO_TCP:
 477                 seq_printf(m, ",mountproto=tcp");
 478                 break;
 479         default:
 480                 if (showdefaults)
 481                         seq_printf(m, ",mountproto=auto");
 482         }
 483 }
 484
 485 /*
 486  * Describe the mount options in force on this server representation
 487  */
 488 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 489                                    int showdefaults)
 490 {
 491         static const struct proc_nfs_info {
 492                 int flag;
 493                 const char *str;
 494                 const char *nostr;
 495         } nfs_info[] = {
 496                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 497                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
 498                 { NFS_MOUNT_POSIX, ",posix", "" },
 499                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 500                 { NFS_MOUNT_NOAC, ",noac", "" },
 501                 { NFS_MOUNT_NONLM, ",nolock", "" },
 502                 { NFS_MOUNT_NOACL, ",noacl", "" },
 503                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 504                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
 505                 { 0, NULL, NULL }
 506         };
 507         const struct proc_nfs_info *nfs_infop;
 508         struct nfs_client *clp = nfss->nfs_client;
 509         u32 version = clp->rpc_ops->version;
 510
 511         seq_printf(m, ",vers=%u", version);
 512         seq_printf(m, ",rsize=%u", nfss->rsize);
 513         seq_printf(m, ",wsize=%u", nfss->wsize);
 514         if (nfss->bsize != 0)
 515                 seq_printf(m, ",bsize=%u", nfss->bsize);
 516         seq_printf(m, ",namlen=%u", nfss->namelen);
 517         if (nfss->acregmin != 3*HZ || showdefaults)
 518                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 519         if (nfss->acregmax != 60*HZ || showdefaults)
 520                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 521         if (nfss->acdirmin != 30*HZ || showdefaults)
 522                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 523         if (nfss->acdirmax != 60*HZ || showdefaults)
 524                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
 525         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 526                 if (nfss->flags & nfs_infop->flag)
 527                         seq_puts(m, nfs_infop->str);
 528                 else
 529                         seq_puts(m, nfs_infop->nostr);
 530         }
 531         seq_printf(m, ",proto=%s",
 532                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 533         if (version == 4) {
 534                 if (nfss->port != NFS_PORT)
 535                         seq_printf(m, ",port=%u", nfss->port);
 536         } else
 537                 if (nfss->port)
 538                         seq_printf(m, ",port=%u", nfss->port);
 539
 540         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 541         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 542         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 543
 544         if (version != 4)
 545                 nfs_show_mountd_options(m, nfss, showdefaults);
 546
 547 #ifdef CONFIG_NFS_V4
 548         if (clp->rpc_ops->version == 4)
 549                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
 550 #endif
 551 }
 552
 553 /*
 554  * Describe the mount options on this VFS mountpoint
 555  */
 556 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 557 {
 558         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 559
 560         nfs_show_mount_options(m, nfss, 0);
 561
 562         seq_printf(m, ",addr=%s",
 563                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 564                                                         RPC_DISPLAY_ADDR));
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Present statistical information for this VFS mountpoint
 571  */
 572 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 573 {
 574         int i, cpu;
 575         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 576         struct rpc_auth *auth = nfss->client->cl_auth;
 577         struct nfs_iostats totals = { };
 578
 579         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 580
 581         /*
 582          * Display all mount option settings
 583          */
 584         seq_printf(m, "\n\topts:\t");
 585         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 586         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 587         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 588         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 589         nfs_show_mount_options(m, nfss, 1);
 590
 591         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 592
 593         seq_printf(m, "\n\tcaps:\t");
 594         seq_printf(m, "caps=0x%x", nfss->caps);
 595         seq_printf(m, ",wtmult=%u", nfss->wtmult);
 596         seq_printf(m, ",dtsize=%u", nfss->dtsize);
 597         seq_printf(m, ",bsize=%u", nfss->bsize);
 598         seq_printf(m, ",namlen=%u", nfss->namelen);
 599
 600 #ifdef CONFIG_NFS_V4
 601         if (nfss->nfs_client->rpc_ops->version == 4) {
 602                 seq_printf(m, "\n\tnfsv4:\t");
 603                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 604                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 605                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 606         }
 607 #endif
 608
 609         /*
 610          * Display security flavor in effect for this mount
 611          */
 612         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
 613         if (auth->au_flavor)
 614                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
 615
 616         /*
 617          * Display superblock I/O counters
 618          */
 619         for_each_possible_cpu(cpu) {
 620                 struct nfs_iostats *stats;
 621
 622                 preempt_disable();
 623                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 624
 625                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 626                         totals.events[i] += stats->events[i];
 627                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 628                         totals.bytes[i] += stats->bytes[i];
 629
 630                 preempt_enable();
 631         }
 632
 633         seq_printf(m, "\n\tevents:\t");
 634         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 635                 seq_printf(m, "%lu ", totals.events[i]);
 636         seq_printf(m, "\n\tbytes:\t");
 637         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 638                 seq_printf(m, "%Lu ", totals.bytes[i]);
 639         seq_printf(m, "\n");
 640
 641         rpc_print_iostats(m, nfss->client);
 642
 643         return 0;
 644 }
 645
 646 /*
 647  * Begin unmount by attempting to remove all automounted mountpoints we added
 648  * in response to xdev traversals and referrals
 649  */
 650 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 651 {
 652         struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
 653         struct rpc_clnt *rpc;
 654
 655         shrink_submounts(vfsmnt, &nfs_automount_list);
 656
 657         if (!(flags & MNT_FORCE))
 658                 return;
 659         /* -EIO all pending I/O */
 660         rpc = server->client_acl;
 661         if (!IS_ERR(rpc))
 662                 rpc_killall_tasks(rpc);
 663         rpc = server->client;
 664         if (!IS_ERR(rpc))
 665                 rpc_killall_tasks(rpc);
 666 }
 667
 668 /*
 669  * Set the port number in an address.  Be agnostic about the address family.
 670  */
 671 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 672 {
 673         switch (sap->sa_family) {
 674         case AF_INET: {
 675                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 676                 ap->sin_port = htons(port);
 677                 break;
 678         }
 679         case AF_INET6: {
 680                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 681                 ap->sin6_port = htons(port);
 682                 break;
 683         }
 684         }
 685 }
 686
 687 /*
 688  * Sanity-check a server address provided by the mount command.
 689  *
 690  * Address family must be initialized, and address must not be
 691  * the ANY address for that family.
 692  */
 693 static int nfs_verify_server_address(struct sockaddr *addr)
 694 {
 695         switch (addr->sa_family) {
 696         case AF_INET: {
 697                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 698                 return sa->sin_addr.s_addr != INADDR_ANY;
 699         }
 700         case AF_INET6: {
 701                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 702                 return !ipv6_addr_any(sa);
 703         }
 704         }
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Parse string addresses passed in via a mount option,
 711  * and construct a sockaddr based on the result.
 712  *
 713  * If address parsing fails, set the sockaddr's address
 714  * family to AF_UNSPEC to force nfs_verify_server_address()
 715  * to punt the mount.
 716  */
 717 static void nfs_parse_server_address(char *value,
 718                                      struct sockaddr *sap,
 719                                      size_t *len)
 720 {
 721         if (strchr(value, ':')) {
 722                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 723                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 724
 725                 ap->sin6_family = AF_INET6;
 726                 *len = sizeof(*ap);
 727                 if (in6_pton(value, -1, addr, '\0', NULL))
 728                         return;
 729         } else {
 730                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 731                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 732
 733                 ap->sin_family = AF_INET;
 734                 *len = sizeof(*ap);
 735                 if (in4_pton(value, -1, addr, '\0', NULL))
 736                         return;
 737         }
 738
 739         sap->sa_family = AF_UNSPEC;
 740         *len = 0;
 741 }
 742
 743 /*
 744  * Error-check and convert a string of mount options from user space into
 745  * a data structure
 746  */
 747 static int nfs_parse_mount_options(char *raw,
 748                                    struct nfs_parsed_mount_data *mnt)
 749 {
 750         char *p, *string, *secdata;
 751         int rc;
 752
 753         if (!raw) {
 754                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 755                 return 1;
 756         }
 757         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 758
 759         secdata = alloc_secdata();
 760         if (!secdata)
 761                 goto out_nomem;
 762
 763         rc = security_sb_copy_data(raw, secdata);
 764         if (rc)
 765                 goto out_security_failure;
 766
 767         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 768         if (rc)
 769                 goto out_security_failure;
 770
 771         free_secdata(secdata);
 772
 773         while ((p = strsep(&raw, ",")) != NULL) {
 774                 substring_t args[MAX_OPT_ARGS];
 775                 int option, token;
 776
 777                 if (!*p)
 778                         continue;
 779
 780                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 781
 782                 token = match_token(p, nfs_mount_option_tokens, args);
 783                 switch (token) {
 784                 case Opt_soft:
 785                         mnt->flags |= NFS_MOUNT_SOFT;
 786                         break;
 787                 case Opt_hard:
 788                         mnt->flags &= ~NFS_MOUNT_SOFT;
 789                         break;
 790                 case Opt_intr:
 791                 case Opt_nointr:
 792                         break;
 793                 case Opt_posix:
 794                         mnt->flags |= NFS_MOUNT_POSIX;
 795                         break;
 796                 case Opt_noposix:
 797                         mnt->flags &= ~NFS_MOUNT_POSIX;
 798                         break;
 799                 case Opt_cto:
 800                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 801                         break;
 802                 case Opt_nocto:
 803                         mnt->flags |= NFS_MOUNT_NOCTO;
 804                         break;
 805                 case Opt_ac:
 806                         mnt->flags &= ~NFS_MOUNT_NOAC;
 807                         break;
 808                 case Opt_noac:
 809                         mnt->flags |= NFS_MOUNT_NOAC;
 810                         break;
 811                 case Opt_lock:
 812                         mnt->flags &= ~NFS_MOUNT_NONLM;
 813                         break;
 814                 case Opt_nolock:
 815                         mnt->flags |= NFS_MOUNT_NONLM;
 816                         break;
 817                 case Opt_v2:
 818                         mnt->flags &= ~NFS_MOUNT_VER3;
 819                         break;
 820                 case Opt_v3:
 821                         mnt->flags |= NFS_MOUNT_VER3;
 822                         break;
 823                 case Opt_udp:
 824                         mnt->flags &= ~NFS_MOUNT_TCP;
 825                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 826                         mnt->timeo = 7;
 827                         mnt->retrans = 5;
 828                         break;
 829                 case Opt_tcp:
 830                         mnt->flags |= NFS_MOUNT_TCP;
 831                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 832                         mnt->timeo = 600;
 833                         mnt->retrans = 2;
 834                         break;
 835                 case Opt_rdma:
 836                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 837                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 838                         mnt->timeo = 600;
 839                         mnt->retrans = 2;
 840                         break;
 841                 case Opt_acl:
 842                         mnt->flags &= ~NFS_MOUNT_NOACL;
 843                         break;
 844                 case Opt_noacl:
 845                         mnt->flags |= NFS_MOUNT_NOACL;
 846                         break;
 847                 case Opt_rdirplus:
 848                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 849                         break;
 850                 case Opt_nordirplus:
 851                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 852                         break;
 853                 case Opt_sharecache:
 854                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 855                         break;
 856                 case Opt_nosharecache:
 857                         mnt->flags |= NFS_MOUNT_UNSHARED;
 858                         break;
 859
 860                 case Opt_port:
 861                         if (match_int(args, &option))
 862                                 return 0;
 863                         if (option < 0 || option > 65535)
 864                                 return 0;
 865                         mnt->nfs_server.port = option;
 866                         break;
 867                 case Opt_rsize:
 868                         if (match_int(args, &mnt->rsize))
 869                                 return 0;
 870                         break;
 871                 case Opt_wsize:
 872                         if (match_int(args, &mnt->wsize))
 873                                 return 0;
 874                         break;
 875                 case Opt_bsize:
 876                         if (match_int(args, &option))
 877                                 return 0;
 878                         if (option < 0)
 879                                 return 0;
 880                         mnt->bsize = option;
 881                         break;
 882                 case Opt_timeo:
 883                         if (match_int(args, &mnt->timeo))
 884                                 return 0;
 885                         break;
 886                 case Opt_retrans:
 887                         if (match_int(args, &mnt->retrans))
 888                                 return 0;
 889                         break;
 890                 case Opt_acregmin:
 891                         if (match_int(args, &mnt->acregmin))
 892                                 return 0;
 893                         break;
 894                 case Opt_acregmax:
 895                         if (match_int(args, &mnt->acregmax))
 896                                 return 0;
 897                         break;
 898                 case Opt_acdirmin:
 899                         if (match_int(args, &mnt->acdirmin))
 900                                 return 0;
 901                         break;
 902                 case Opt_acdirmax:
 903                         if (match_int(args, &mnt->acdirmax))
 904                                 return 0;
 905                         break;
 906                 case Opt_actimeo:
 907                         if (match_int(args, &option))
 908                                 return 0;
 909                         if (option < 0)
 910                                 return 0;
 911                         mnt->acregmin =
 912                         mnt->acregmax =
 913                         mnt->acdirmin =
 914                         mnt->acdirmax = option;
 915                         break;
 916                 case Opt_namelen:
 917                         if (match_int(args, &mnt->namlen))
 918                                 return 0;
 919                         break;
 920                 case Opt_mountport:
 921                         if (match_int(args, &option))
 922                                 return 0;
 923                         if (option < 0 || option > 65535)
 924                                 return 0;
 925                         mnt->mount_server.port = option;
 926                         break;
 927                 case Opt_mountvers:
 928                         if (match_int(args, &option))
 929                                 return 0;
 930                         if (option < 0)
 931                                 return 0;
 932                         mnt->mount_server.version = option;
 933                         break;
 934                 case Opt_nfsvers:
 935                         if (match_int(args, &option))
 936                                 return 0;
 937                         switch (option) {
 938                         case 2:
 939                                 mnt->flags &= ~NFS_MOUNT_VER3;
 940                                 break;
 941                         case 3:
 942                                 mnt->flags |= NFS_MOUNT_VER3;
 943                                 break;
 944                         default:
 945                                 goto out_unrec_vers;
 946                         }
 947                         break;
 948
 949                 case Opt_sec:
 950                         string = match_strdup(args);
 951                         if (string == NULL)
 952                                 goto out_nomem;
 953                         token = match_token(string, nfs_secflavor_tokens, args);
 954                         kfree(string);
 955
 956                         /*
 957                          * The flags setting is for v2/v3.  The flavor_len
 958                          * setting is for v4.  v2/v3 also need to know the
 959                          * difference between NULL and UNIX.
 960                          */
 961                         switch (token) {
 962                         case Opt_sec_none:
 963                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 964                                 mnt->auth_flavor_len = 0;
 965                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 966                                 break;
 967                         case Opt_sec_sys:
 968                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 969                                 mnt->auth_flavor_len = 0;
 970                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 971                                 break;
 972                         case Opt_sec_krb5:
 973                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 974                                 mnt->auth_flavor_len = 1;
 975                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 976                                 break;
 977                         case Opt_sec_krb5i:
 978                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 979                                 mnt->auth_flavor_len = 1;
 980                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 981                                 break;
 982                         case Opt_sec_krb5p:
 983                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 984                                 mnt->auth_flavor_len = 1;
 985                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 986                                 break;
 987                         case Opt_sec_lkey:
 988                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 989                                 mnt->auth_flavor_len = 1;
 990                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 991                                 break;
 992                         case Opt_sec_lkeyi:
 993                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 994                                 mnt->auth_flavor_len = 1;
 995                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 996                                 break;
 997                         case Opt_sec_lkeyp:
 998                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 999                                 mnt->auth_flavor_len = 1;
1000                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1001                                 break;
1002                         case Opt_sec_spkm:
1003                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1004                                 mnt->auth_flavor_len = 1;
1005                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1006                                 break;
1007                         case Opt_sec_spkmi:
1008                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1009                                 mnt->auth_flavor_len = 1;
1010                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1011                                 break;
1012                         case Opt_sec_spkmp:
1013                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1014                                 mnt->auth_flavor_len = 1;
1015                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1016                                 break;
1017                         default:
1018                                 goto out_unrec_sec;
1019                         }
1020                         break;
1021                 case Opt_proto:
1022                         string = match_strdup(args);
1023                         if (string == NULL)
1024                                 goto out_nomem;
1025                         token = match_token(string,
1026                                             nfs_xprt_protocol_tokens, args);
1027                         kfree(string);
1028
1029                         switch (token) {
1030                         case Opt_xprt_udp:
1031                                 mnt->flags &= ~NFS_MOUNT_TCP;
1032                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1033                                 mnt->timeo = 7;
1034                                 mnt->retrans = 5;
1035                                 break;
1036                         case Opt_xprt_tcp:
1037                                 mnt->flags |= NFS_MOUNT_TCP;
1038                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1039                                 mnt->timeo = 600;
1040                                 mnt->retrans = 2;
1041                                 break;
1042                         case Opt_xprt_rdma:
1043                                 /* vector side protocols to TCP */
1044                                 mnt->flags |= NFS_MOUNT_TCP;
1045                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1046                                 mnt->timeo = 600;
1047                                 mnt->retrans = 2;
1048                                 break;
1049                         default:
1050                                 goto out_unrec_xprt;
1051                         }
1052                         break;
1053                 case Opt_mountproto:
1054                         string = match_strdup(args);
1055                         if (string == NULL)
1056                                 goto out_nomem;
1057                         token = match_token(string,
1058                                             nfs_xprt_protocol_tokens, args);
1059                         kfree(string);
1060
1061                         switch (token) {
1062                         case Opt_xprt_udp:
1063                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1064                                 break;
1065                         case Opt_xprt_tcp:
1066                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1067                                 break;
1068                         case Opt_xprt_rdma: /* not used for side protocols */
1069                         default:
1070                                 goto out_unrec_xprt;
1071                         }
1072                         break;
1073                 case Opt_addr:
1074                         string = match_strdup(args);
1075                         if (string == NULL)
1076                                 goto out_nomem;
1077                         nfs_parse_server_address(string, (struct sockaddr *)
1078                                                  &mnt->nfs_server.address,
1079                                                  &mnt->nfs_server.addrlen);
1080                         kfree(string);
1081                         break;
1082                 case Opt_clientaddr:
1083                         string = match_strdup(args);
1084                         if (string == NULL)
1085                                 goto out_nomem;
1086                         kfree(mnt->client_address);
1087                         mnt->client_address = string;
1088                         break;
1089                 case Opt_mounthost:
1090                         string = match_strdup(args);
1091                         if (string == NULL)
1092                                 goto out_nomem;
1093                         kfree(mnt->mount_server.hostname);
1094                         mnt->mount_server.hostname = string;
1095                         break;
1096                 case Opt_mountaddr:
1097                         string = match_strdup(args);
1098                         if (string == NULL)
1099                                 goto out_nomem;
1100                         nfs_parse_server_address(string, (struct sockaddr *)
1101                                                  &mnt->mount_server.address,
1102                                                  &mnt->mount_server.addrlen);
1103                         kfree(string);
1104                         break;
1105
1106                 case Opt_userspace:
1107                 case Opt_deprecated:
1108                         break;
1109
1110                 default:
1111                         goto out_unknown;
1112                 }
1113         }
1114
1115         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1116                                 mnt->nfs_server.port);
1117
1118         return 1;
1119
1120 out_nomem:
1121         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1122         return 0;
1123 out_security_failure:
1124         free_secdata(secdata);
1125         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1126         return 0;
1127 out_unrec_vers:
1128         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1129         return 0;
1130
1131 out_unrec_xprt:
1132         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1133         return 0;
1134
1135 out_unrec_sec:
1136         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1137         return 0;
1138
1139 out_unknown:
1140         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1141         return 0;
1142 }
1143
1144 /*
1145  * Use the remote server's MOUNT service to request the NFS file handle
1146  * corresponding to the provided path.
1147  */
1148 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1149                          struct nfs_fh *root_fh)
1150 {
1151         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1152         char *hostname;
1153         int status;
1154
1155         if (args->mount_server.version == 0) {
1156                 if (args->flags & NFS_MOUNT_VER3)
1157                         args->mount_server.version = NFS_MNT3_VERSION;
1158                 else
1159                         args->mount_server.version = NFS_MNT_VERSION;
1160         }
1161
1162         if (args->mount_server.hostname)
1163                 hostname = args->mount_server.hostname;
1164         else
1165                 hostname = args->nfs_server.hostname;
1166
1167         /*
1168          * Construct the mount server's address.
1169          */
1170         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1171                 memcpy(sap, &args->nfs_server.address,
1172                        args->nfs_server.addrlen);
1173                 args->mount_server.addrlen = args->nfs_server.addrlen;
1174         }
1175
1176         /*
1177          * autobind will be used if mount_server.port == 0
1178          */
1179         nfs_set_port(sap, args->mount_server.port);
1180
1181         /*
1182          * Now ask the mount server to map our export path
1183          * to a file handle.
1184          */
1185         status = nfs_mount(sap,
1186                            args->mount_server.addrlen,
1187                            hostname,
1188                            args->nfs_server.export_path,
1189                            args->mount_server.version,
1190                            args->mount_server.protocol,
1191                            root_fh);
1192         if (status == 0)
1193                 return 0;
1194
1195         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1196                         hostname, status);
1197         return status;
1198 }
1199
1200 /*
1201  * Validate the NFS2/NFS3 mount data
1202  * - fills in the mount root filehandle
1203  *
1204  * For option strings, user space handles the following behaviors:
1205  *
1206  * + DNS: mapping server host name to IP address ("addr=" option)
1207  *
1208  * + failure mode: how to behave if a mount request can't be handled
1209  *   immediately ("fg/bg" option)
1210  *
1211  * + retry: how often to retry a mount request ("retry=" option)
1212  *
1213  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1214  *   mountproto=tcp after mountproto=udp, and so on
1215  */
1216 static int nfs_validate_mount_data(void *options,
1217                                    struct nfs_parsed_mount_data *args,
1218                                    struct nfs_fh *mntfh,
1219                                    const char *dev_name)
1220 {
1221         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1222
1223         memset(args, 0, sizeof(*args));
1224
1225         if (data == NULL)
1226                 goto out_no_data;
1227
1228         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1229         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1230         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1231         args->timeo             = 600;
1232         args->retrans           = 2;
1233         args->acregmin          = 3;
1234         args->acregmax          = 60;
1235         args->acdirmin          = 30;
1236         args->acdirmax          = 60;
1237         args->mount_server.port = 0;    /* autobind unless user sets port */
1238         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1239         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1240         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1241
1242         switch (data->version) {
1243         case 1:
1244                 data->namlen = 0;
1245         case 2:
1246                 data->bsize = 0;
1247         case 3:
1248                 if (data->flags & NFS_MOUNT_VER3)
1249                         goto out_no_v3;
1250                 data->root.size = NFS2_FHSIZE;
1251                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1252         case 4:
1253                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1254                         goto out_no_sec;
1255         case 5:
1256                 memset(data->context, 0, sizeof(data->context));
1257         case 6:
1258                 if (data->flags & NFS_MOUNT_VER3)
1259                         mntfh->size = data->root.size;
1260                 else
1261                         mntfh->size = NFS2_FHSIZE;
1262
1263                 if (mntfh->size > sizeof(mntfh->data))
1264                         goto out_invalid_fh;
1265
1266                 memcpy(mntfh->data, data->root.data, mntfh->size);
1267                 if (mntfh->size < sizeof(mntfh->data))
1268                         memset(mntfh->data + mntfh->size, 0,
1269                                sizeof(mntfh->data) - mntfh->size);
1270
1271                 /*
1272                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1273                  * can deal with.
1274                  */
1275                 args->flags             = data->flags;
1276                 args->rsize             = data->rsize;
1277                 args->wsize             = data->wsize;
1278                 args->flags             = data->flags;
1279                 args->timeo             = data->timeo;
1280                 args->retrans           = data->retrans;
1281                 args->acregmin          = data->acregmin;
1282                 args->acregmax          = data->acregmax;
1283                 args->acdirmin          = data->acdirmin;
1284                 args->acdirmax          = data->acdirmax;
1285
1286                 memcpy(&args->nfs_server.address, &data->addr,
1287                        sizeof(data->addr));
1288                 args->nfs_server.addrlen = sizeof(data->addr);
1289                 if (!nfs_verify_server_address((struct sockaddr *)
1290                                                 &args->nfs_server.address))
1291                         goto out_no_address;
1292
1293                 if (!(data->flags & NFS_MOUNT_TCP))
1294                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1295                 /* N.B. caller will free nfs_server.hostname in all cases */
1296                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1297                 args->namlen            = data->namlen;
1298                 args->bsize             = data->bsize;
1299                 args->auth_flavors[0]   = data->pseudoflavor;
1300                 if (!args->nfs_server.hostname)
1301                         goto out_nomem;
1302
1303                 /*
1304                  * The legacy version 6 binary mount data from userspace has a
1305                  * field used only to transport selinux information into the
1306                  * the kernel.  To continue to support that functionality we
1307                  * have a touch of selinux knowledge here in the NFS code. The
1308                  * userspace code converted context=blah to just blah so we are
1309                  * converting back to the full string selinux understands.
1310                  */
1311                 if (data->context[0]){
1312 #ifdef CONFIG_SECURITY_SELINUX
1313                         int rc;
1314                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1315                         if (!opts_str)
1316                                 return -ENOMEM;
1317                         strcpy(opts_str, "context=");
1318                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1319                         strcat(opts_str, &data->context[0]);
1320                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1321                         kfree(opts_str);
1322                         if (rc)
1323                                 return rc;
1324 #else
1325                         return -EINVAL;
1326 #endif
1327                 }
1328
1329                 break;
1330         default: {
1331                 unsigned int len;
1332                 char *c;
1333                 int status;
1334
1335                 if (nfs_parse_mount_options((char *)options, args) == 0)
1336                         return -EINVAL;
1337
1338                 if (!nfs_verify_server_address((struct sockaddr *)
1339                                                 &args->nfs_server.address))
1340                         goto out_no_address;
1341
1342                 c = strchr(dev_name, ':');
1343                 if (c == NULL)
1344                         return -EINVAL;
1345                 len = c - dev_name;
1346                 /* N.B. caller will free nfs_server.hostname in all cases */
1347                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1348                 if (!args->nfs_server.hostname)
1349                         goto out_nomem;
1350
1351                 c++;
1352                 if (strlen(c) > NFS_MAXPATHLEN)
1353                         return -ENAMETOOLONG;
1354                 args->nfs_server.export_path = c;
1355
1356                 status = nfs_try_mount(args, mntfh);
1357                 if (status)
1358                         return status;
1359
1360                 break;
1361                 }
1362         }
1363
1364         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1365                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1366
1367 #ifndef CONFIG_NFS_V3
1368         if (args->flags & NFS_MOUNT_VER3)
1369                 goto out_v3_not_compiled;
1370 #endif /* !CONFIG_NFS_V3 */
1371
1372         return 0;
1373
1374 out_no_data:
1375         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1376         return -EINVAL;
1377
1378 out_no_v3:
1379         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1380                  data->version);
1381         return -EINVAL;
1382
1383 out_no_sec:
1384         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1385         return -EINVAL;
1386
1387 #ifndef CONFIG_NFS_V3
1388 out_v3_not_compiled:
1389         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1390         return -EPROTONOSUPPORT;
1391 #endif /* !CONFIG_NFS_V3 */
1392
1393 out_nomem:
1394         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1395         return -ENOMEM;
1396
1397 out_no_address:
1398         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1399         return -EINVAL;
1400
1401 out_invalid_fh:
1402         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1403         return -EINVAL;
1404 }
1405
1406 /*
1407  * Initialise the common bits of the superblock
1408  */
1409 static inline void nfs_initialise_sb(struct super_block *sb)
1410 {
1411         struct nfs_server *server = NFS_SB(sb);
1412
1413         sb->s_magic = NFS_SUPER_MAGIC;
1414
1415         /* We probably want something more informative here */
1416         snprintf(sb->s_id, sizeof(sb->s_id),
1417                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1418
1419         if (sb->s_blocksize == 0)
1420                 sb->s_blocksize = nfs_block_bits(server->wsize,
1421                                                  &sb->s_blocksize_bits);
1422
1423         if (server->flags & NFS_MOUNT_NOAC)
1424                 sb->s_flags |= MS_SYNCHRONOUS;
1425
1426         nfs_super_set_maxbytes(sb, server->maxfilesize);
1427 }
1428
1429 /*
1430  * Finish setting up an NFS2/3 superblock
1431  */
1432 static void nfs_fill_super(struct super_block *sb,
1433                            struct nfs_parsed_mount_data *data)
1434 {
1435         struct nfs_server *server = NFS_SB(sb);
1436
1437         sb->s_blocksize_bits = 0;
1438         sb->s_blocksize = 0;
1439         if (data->bsize)
1440                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1441
1442         if (server->flags & NFS_MOUNT_VER3) {
1443                 /* The VFS shouldn't apply the umask to mode bits. We will do
1444                  * so ourselves when necessary.
1445                  */
1446                 sb->s_flags |= MS_POSIXACL;
1447                 sb->s_time_gran = 1;
1448         }
1449
1450         sb->s_op = &nfs_sops;
1451         nfs_initialise_sb(sb);
1452 }
1453
1454 /*
1455  * Finish setting up a cloned NFS2/3 superblock
1456  */
1457 static void nfs_clone_super(struct super_block *sb,
1458                             const struct super_block *old_sb)
1459 {
1460         struct nfs_server *server = NFS_SB(sb);
1461
1462         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1463         sb->s_blocksize = old_sb->s_blocksize;
1464         sb->s_maxbytes = old_sb->s_maxbytes;
1465
1466         if (server->flags & NFS_MOUNT_VER3) {
1467                 /* The VFS shouldn't apply the umask to mode bits. We will do
1468                  * so ourselves when necessary.
1469                  */
1470                 sb->s_flags |= MS_POSIXACL;
1471                 sb->s_time_gran = 1;
1472         }
1473
1474         sb->s_op = old_sb->s_op;
1475         nfs_initialise_sb(sb);
1476 }
1477
1478 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1479
1480 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1481 {
1482         const struct nfs_server *a = s->s_fs_info;
1483         const struct rpc_clnt *clnt_a = a->client;
1484         const struct rpc_clnt *clnt_b = b->client;
1485
1486         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1487                 goto Ebusy;
1488         if (a->nfs_client != b->nfs_client)
1489                 goto Ebusy;
1490         if (a->flags != b->flags)
1491                 goto Ebusy;
1492         if (a->wsize != b->wsize)
1493                 goto Ebusy;
1494         if (a->rsize != b->rsize)
1495                 goto Ebusy;
1496         if (a->acregmin != b->acregmin)
1497                 goto Ebusy;
1498         if (a->acregmax != b->acregmax)
1499                 goto Ebusy;
1500         if (a->acdirmin != b->acdirmin)
1501                 goto Ebusy;
1502         if (a->acdirmax != b->acdirmax)
1503                 goto Ebusy;
1504         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1505                 goto Ebusy;
1506         return 1;
1507 Ebusy:
1508         return 0;
1509 }
1510
1511 struct nfs_sb_mountdata {
1512         struct nfs_server *server;
1513         int mntflags;
1514 };
1515
1516 static int nfs_set_super(struct super_block *s, void *data)
1517 {
1518         struct nfs_sb_mountdata *sb_mntdata = data;
1519         struct nfs_server *server = sb_mntdata->server;
1520         int ret;
1521
1522         s->s_flags = sb_mntdata->mntflags;
1523         s->s_fs_info = server;
1524         ret = set_anon_super(s, server);
1525         if (ret == 0)
1526                 server->s_dev = s->s_dev;
1527         return ret;
1528 }
1529
1530 static int nfs_compare_super_address(struct nfs_server *server1,
1531                                      struct nfs_server *server2)
1532 {
1533         struct sockaddr *sap1, *sap2;
1534
1535         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1536         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1537
1538         if (sap1->sa_family != sap2->sa_family)
1539                 return 0;
1540
1541         switch (sap1->sa_family) {
1542         case AF_INET: {
1543                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1544                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1545                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1546                         return 0;
1547                 if (sin1->sin_port != sin2->sin_port)
1548                         return 0;
1549                 break;
1550         }
1551         case AF_INET6: {
1552                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1553                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1554                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1555                         return 0;
1556                 if (sin1->sin6_port != sin2->sin6_port)
1557                         return 0;
1558                 break;
1559         }
1560         default:
1561                 return 0;
1562         }
1563
1564         return 1;
1565 }
1566
1567 static int nfs_compare_super(struct super_block *sb, void *data)
1568 {
1569         struct nfs_sb_mountdata *sb_mntdata = data;
1570         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1571         int mntflags = sb_mntdata->mntflags;
1572
1573         if (!nfs_compare_super_address(old, server))
1574                 return 0;
1575         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1576         if (old->flags & NFS_MOUNT_UNSHARED)
1577                 return 0;
1578         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1579                 return 0;
1580         return nfs_compare_mount_options(sb, server, mntflags);
1581 }
1582
1583 static int nfs_get_sb(struct file_system_type *fs_type,
1584         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1585 {
1586         struct nfs_server *server = NULL;
1587         struct super_block *s;
1588         struct nfs_fh mntfh;
1589         struct nfs_parsed_mount_data data;
1590         struct dentry *mntroot;
1591         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1592         struct nfs_sb_mountdata sb_mntdata = {
1593                 .mntflags = flags,
1594         };
1595         int error;
1596
1597         security_init_mnt_opts(&data.lsm_opts);
1598
1599         /* Validate the mount data */
1600         error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1601         if (error < 0)
1602                 goto out;
1603
1604         /* Get a volume representation */
1605         server = nfs_create_server(&data, &mntfh);
1606         if (IS_ERR(server)) {
1607                 error = PTR_ERR(server);
1608                 goto out;
1609         }
1610         sb_mntdata.server = server;
1611
1612         if (server->flags & NFS_MOUNT_UNSHARED)
1613                 compare_super = NULL;
1614
1615         /* Get a superblock - note that we may end up sharing one that already exists */
1616         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1617         if (IS_ERR(s)) {
1618                 error = PTR_ERR(s);
1619                 goto out_err_nosb;
1620         }
1621
1622         if (s->s_fs_info != server) {
1623                 nfs_free_server(server);
1624                 server = NULL;
1625         }
1626
1627         if (!s->s_root) {
1628                 /* initial superblock/root creation */
1629                 nfs_fill_super(s, &data);
1630         }
1631
1632         mntroot = nfs_get_root(s, &mntfh);
1633         if (IS_ERR(mntroot)) {
1634                 error = PTR_ERR(mntroot);
1635                 goto error_splat_super;
1636         }
1637
1638         error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1639         if (error)
1640                 goto error_splat_root;
1641
1642         s->s_flags |= MS_ACTIVE;
1643         mnt->mnt_sb = s;
1644         mnt->mnt_root = mntroot;
1645         error = 0;
1646
1647 out:
1648         kfree(data.nfs_server.hostname);
1649         kfree(data.mount_server.hostname);
1650         security_free_mnt_opts(&data.lsm_opts);
1651         return error;
1652
1653 out_err_nosb:
1654         nfs_free_server(server);
1655         goto out;
1656
1657 error_splat_root:
1658         dput(mntroot);
1659 error_splat_super:
1660         up_write(&s->s_umount);
1661         deactivate_super(s);
1662         goto out;
1663 }
1664
1665 /*
1666  * Destroy an NFS2/3 superblock
1667  */
1668 static void nfs_kill_super(struct super_block *s)
1669 {
1670         struct nfs_server *server = NFS_SB(s);
1671
1672         kill_anon_super(s);
1673         nfs_free_server(server);
1674 }
1675
1676 /*
1677  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1678  */
1679 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1680                            const char *dev_name, void *raw_data,
1681                            struct vfsmount *mnt)
1682 {
1683         struct nfs_clone_mount *data = raw_data;
1684         struct super_block *s;
1685         struct nfs_server *server;
1686         struct dentry *mntroot;
1687         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1688         struct nfs_sb_mountdata sb_mntdata = {
1689                 .mntflags = flags,
1690         };
1691         int error;
1692
1693         dprintk("--> nfs_xdev_get_sb()\n");
1694
1695         /* create a new volume representation */
1696         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1697         if (IS_ERR(server)) {
1698                 error = PTR_ERR(server);
1699                 goto out_err_noserver;
1700         }
1701         sb_mntdata.server = server;
1702
1703         if (server->flags & NFS_MOUNT_UNSHARED)
1704                 compare_super = NULL;
1705
1706         /* Get a superblock - note that we may end up sharing one that already exists */
1707         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1708         if (IS_ERR(s)) {
1709                 error = PTR_ERR(s);
1710                 goto out_err_nosb;
1711         }
1712
1713         if (s->s_fs_info != server) {
1714                 nfs_free_server(server);
1715                 server = NULL;
1716         }
1717
1718         if (!s->s_root) {
1719                 /* initial superblock/root creation */
1720                 nfs_clone_super(s, data->sb);
1721         }
1722
1723         mntroot = nfs_get_root(s, data->fh);
1724         if (IS_ERR(mntroot)) {
1725                 error = PTR_ERR(mntroot);
1726                 goto error_splat_super;
1727         }
1728         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1729                 dput(mntroot);
1730                 error = -ESTALE;
1731                 goto error_splat_super;
1732         }
1733
1734         s->s_flags |= MS_ACTIVE;
1735         mnt->mnt_sb = s;
1736         mnt->mnt_root = mntroot;
1737
1738         /* clone any lsm security options from the parent to the new sb */
1739         security_sb_clone_mnt_opts(data->sb, s);
1740
1741         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1742         return 0;
1743
1744 out_err_nosb:
1745         nfs_free_server(server);
1746 out_err_noserver:
1747         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1748         return error;
1749
1750 error_splat_super:
1751         up_write(&s->s_umount);
1752         deactivate_super(s);
1753         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1754         return error;
1755 }
1756
1757 #ifdef CONFIG_NFS_V4
1758
1759 /*
1760  * Finish setting up a cloned NFS4 superblock
1761  */
1762 static void nfs4_clone_super(struct super_block *sb,
1763                             const struct super_block *old_sb)
1764 {
1765         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1766         sb->s_blocksize = old_sb->s_blocksize;
1767         sb->s_maxbytes = old_sb->s_maxbytes;
1768         sb->s_time_gran = 1;
1769         sb->s_op = old_sb->s_op;
1770         nfs_initialise_sb(sb);
1771 }
1772
1773 /*
1774  * Set up an NFS4 superblock
1775  */
1776 static void nfs4_fill_super(struct super_block *sb)
1777 {
1778         sb->s_time_gran = 1;
1779         sb->s_op = &nfs4_sops;
1780         nfs_initialise_sb(sb);
1781 }
1782
1783 /*
1784  * Validate NFSv4 mount options
1785  */
1786 static int nfs4_validate_mount_data(void *options,
1787                                     struct nfs_parsed_mount_data *args,
1788                                     const char *dev_name)
1789 {
1790         struct sockaddr_in *ap;
1791         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1792         char *c;
1793
1794         memset(args, 0, sizeof(*args));
1795
1796         if (data == NULL)
1797                 goto out_no_data;
1798
1799         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1800         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1801         args->timeo             = 600;
1802         args->retrans           = 2;
1803         args->acregmin          = 3;
1804         args->acregmax          = 60;
1805         args->acdirmin          = 30;
1806         args->acdirmax          = 60;
1807         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1808         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1809
1810         switch (data->version) {
1811         case 1:
1812                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1813                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1814                         goto out_no_address;
1815                 if (data->host_addrlen == 0)
1816                         goto out_no_address;
1817                 args->nfs_server.addrlen = data->host_addrlen;
1818                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1819                         return -EFAULT;
1820                 if (!nfs_verify_server_address((struct sockaddr *)
1821                                                 &args->nfs_server.address))
1822                         goto out_no_address;
1823
1824                 switch (data->auth_flavourlen) {
1825                 case 0:
1826                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1827                         break;
1828                 case 1:
1829                         if (copy_from_user(&args->auth_flavors[0],
1830                                            data->auth_flavours,
1831                                            sizeof(args->auth_flavors[0])))
1832                                 return -EFAULT;
1833                         break;
1834                 default:
1835                         goto out_inval_auth;
1836                 }
1837
1838                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1839                 if (IS_ERR(c))
1840                         return PTR_ERR(c);
1841                 args->nfs_server.hostname = c;
1842
1843                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1844                 if (IS_ERR(c))
1845                         return PTR_ERR(c);
1846                 args->nfs_server.export_path = c;
1847                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1848
1849                 c = strndup_user(data->client_addr.data, 16);
1850                 if (IS_ERR(c))
1851                         return PTR_ERR(c);
1852                 args->client_address = c;
1853
1854                 /*
1855                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1856                  * can deal with.
1857                  */
1858
1859                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1860                 args->rsize     = data->rsize;
1861                 args->wsize     = data->wsize;
1862                 args->timeo     = data->timeo;
1863                 args->retrans   = data->retrans;
1864                 args->acregmin  = data->acregmin;
1865                 args->acregmax  = data->acregmax;
1866                 args->acdirmin  = data->acdirmin;
1867                 args->acdirmax  = data->acdirmax;
1868                 args->nfs_server.protocol = data->proto;
1869
1870                 break;
1871         default: {
1872                 unsigned int len;
1873
1874                 if (nfs_parse_mount_options((char *)options, args) == 0)
1875                         return -EINVAL;
1876
1877                 if (!nfs_verify_server_address((struct sockaddr *)
1878                                                 &args->nfs_server.address))
1879                         return -EINVAL;
1880
1881                 switch (args->auth_flavor_len) {
1882                 case 0:
1883                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1884                         break;
1885                 case 1:
1886                         break;
1887                 default:
1888                         goto out_inval_auth;
1889                 }
1890
1891                 /*
1892                  * Split "dev_name" into "hostname:mntpath".
1893                  */
1894                 c = strchr(dev_name, ':');
1895                 if (c == NULL)
1896                         return -EINVAL;
1897                 /* while calculating len, pretend ':' is '\0' */
1898                 len = c - dev_name;
1899                 if (len > NFS4_MAXNAMLEN)
1900                         return -ENAMETOOLONG;
1901                 /* N.B. caller will free nfs_server.hostname in all cases */
1902                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1903                 if (!args->nfs_server.hostname)
1904                         goto out_nomem;
1905
1906                 c++;                    /* step over the ':' */
1907                 len = strlen(c);
1908                 if (len > NFS4_MAXPATHLEN)
1909                         return -ENAMETOOLONG;
1910                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1911                 if (!args->nfs_server.export_path)
1912                         goto out_nomem;
1913
1914                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1915
1916                 if (args->client_address == NULL)
1917                         goto out_no_client_address;
1918
1919                 break;
1920                 }
1921         }
1922
1923         return 0;
1924
1925 out_no_data:
1926         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1927         return -EINVAL;
1928
1929 out_inval_auth:
1930         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1931                  data->auth_flavourlen);
1932         return -EINVAL;
1933
1934 out_nomem:
1935         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1936         return -ENOMEM;
1937
1938 out_no_address:
1939         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1940         return -EINVAL;
1941
1942 out_no_client_address:
1943         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1944         return -EINVAL;
1945 }
1946
1947 /*
1948  * Get the superblock for an NFS4 mountpoint
1949  */
1950 static int nfs4_get_sb(struct file_system_type *fs_type,
1951         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1952 {
1953         struct nfs_parsed_mount_data data;
1954         struct super_block *s;
1955         struct nfs_server *server;
1956         struct nfs_fh mntfh;
1957         struct dentry *mntroot;
1958         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1959         struct nfs_sb_mountdata sb_mntdata = {
1960                 .mntflags = flags,
1961         };
1962         int error;
1963
1964         security_init_mnt_opts(&data.lsm_opts);
1965
1966         /* Validate the mount data */
1967         error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1968         if (error < 0)
1969                 goto out;
1970
1971         /* Get a volume representation */
1972         server = nfs4_create_server(&data, &mntfh);
1973         if (IS_ERR(server)) {
1974                 error = PTR_ERR(server);
1975                 goto out;
1976         }
1977         sb_mntdata.server = server;
1978
1979         if (server->flags & NFS4_MOUNT_UNSHARED)
1980                 compare_super = NULL;
1981
1982         /* Get a superblock - note that we may end up sharing one that already exists */
1983         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1984         if (IS_ERR(s)) {
1985                 error = PTR_ERR(s);
1986                 goto out_free;
1987         }
1988
1989         if (s->s_fs_info != server) {
1990                 nfs_free_server(server);
1991                 server = NULL;
1992         }
1993
1994         if (!s->s_root) {
1995                 /* initial superblock/root creation */
1996                 nfs4_fill_super(s);
1997         }
1998
1999         mntroot = nfs4_get_root(s, &mntfh);
2000         if (IS_ERR(mntroot)) {
2001                 error = PTR_ERR(mntroot);
2002                 goto error_splat_super;
2003         }
2004
2005         s->s_flags |= MS_ACTIVE;
2006         mnt->mnt_sb = s;
2007         mnt->mnt_root = mntroot;
2008         error = 0;
2009
2010 out:
2011         kfree(data.client_address);
2012         kfree(data.nfs_server.export_path);
2013         kfree(data.nfs_server.hostname);
2014         security_free_mnt_opts(&data.lsm_opts);
2015         return error;
2016
2017 out_free:
2018         nfs_free_server(server);
2019         goto out;
2020
2021 error_splat_super:
2022         up_write(&s->s_umount);
2023         deactivate_super(s);
2024         goto out;
2025 }
2026
2027 static void nfs4_kill_super(struct super_block *sb)
2028 {
2029         struct nfs_server *server = NFS_SB(sb);
2030
2031         nfs_return_all_delegations(sb);
2032         kill_anon_super(sb);
2033
2034         nfs4_renewd_prepare_shutdown(server);
2035         nfs_free_server(server);
2036 }
2037
2038 /*
2039  * Clone an NFS4 server record on xdev traversal (FSID-change)
2040  */
2041 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2042                             const char *dev_name, void *raw_data,
2043                             struct vfsmount *mnt)
2044 {
2045         struct nfs_clone_mount *data = raw_data;
2046         struct super_block *s;
2047         struct nfs_server *server;
2048         struct dentry *mntroot;
2049         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2050         struct nfs_sb_mountdata sb_mntdata = {
2051                 .mntflags = flags,
2052         };
2053         int error;
2054
2055         dprintk("--> nfs4_xdev_get_sb()\n");
2056
2057         /* create a new volume representation */
2058         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2059         if (IS_ERR(server)) {
2060                 error = PTR_ERR(server);
2061                 goto out_err_noserver;
2062         }
2063         sb_mntdata.server = server;
2064
2065         if (server->flags & NFS4_MOUNT_UNSHARED)
2066                 compare_super = NULL;
2067
2068         /* Get a superblock - note that we may end up sharing one that already exists */
2069         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2070         if (IS_ERR(s)) {
2071                 error = PTR_ERR(s);
2072                 goto out_err_nosb;
2073         }
2074
2075         if (s->s_fs_info != server) {
2076                 nfs_free_server(server);
2077                 server = NULL;
2078         }
2079
2080         if (!s->s_root) {
2081                 /* initial superblock/root creation */
2082                 nfs4_clone_super(s, data->sb);
2083         }
2084
2085         mntroot = nfs4_get_root(s, data->fh);
2086         if (IS_ERR(mntroot)) {
2087                 error = PTR_ERR(mntroot);
2088                 goto error_splat_super;
2089         }
2090         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2091                 dput(mntroot);
2092                 error = -ESTALE;
2093                 goto error_splat_super;
2094         }
2095
2096         s->s_flags |= MS_ACTIVE;
2097         mnt->mnt_sb = s;
2098         mnt->mnt_root = mntroot;
2099
2100         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2101         return 0;
2102
2103 out_err_nosb:
2104         nfs_free_server(server);
2105 out_err_noserver:
2106         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2107         return error;
2108
2109 error_splat_super:
2110         up_write(&s->s_umount);
2111         deactivate_super(s);
2112         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2113         return error;
2114 }
2115
2116 /*
2117  * Create an NFS4 server record on referral traversal
2118  */
2119 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2120                                 const char *dev_name, void *raw_data,
2121                                 struct vfsmount *mnt)
2122 {
2123         struct nfs_clone_mount *data = raw_data;
2124         struct super_block *s;
2125         struct nfs_server *server;
2126         struct dentry *mntroot;
2127         struct nfs_fh mntfh;
2128         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2129         struct nfs_sb_mountdata sb_mntdata = {
2130                 .mntflags = flags,
2131         };
2132         int error;
2133
2134         dprintk("--> nfs4_referral_get_sb()\n");
2135
2136         /* create a new volume representation */
2137         server = nfs4_create_referral_server(data, &mntfh);
2138         if (IS_ERR(server)) {
2139                 error = PTR_ERR(server);
2140                 goto out_err_noserver;
2141         }
2142         sb_mntdata.server = server;
2143
2144         if (server->flags & NFS4_MOUNT_UNSHARED)
2145                 compare_super = NULL;
2146
2147         /* Get a superblock - note that we may end up sharing one that already exists */
2148         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2149         if (IS_ERR(s)) {
2150                 error = PTR_ERR(s);
2151                 goto out_err_nosb;
2152         }
2153
2154         if (s->s_fs_info != server) {
2155                 nfs_free_server(server);
2156                 server = NULL;
2157         }
2158
2159         if (!s->s_root) {
2160                 /* initial superblock/root creation */
2161                 nfs4_fill_super(s);
2162         }
2163
2164         mntroot = nfs4_get_root(s, &mntfh);
2165         if (IS_ERR(mntroot)) {
2166                 error = PTR_ERR(mntroot);
2167                 goto error_splat_super;
2168         }
2169         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2170                 dput(mntroot);
2171                 error = -ESTALE;
2172                 goto error_splat_super;
2173         }
2174
2175         s->s_flags |= MS_ACTIVE;
2176         mnt->mnt_sb = s;
2177         mnt->mnt_root = mntroot;
2178
2179         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2180         return 0;
2181
2182 out_err_nosb:
2183         nfs_free_server(server);
2184 out_err_noserver:
2185         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2186         return error;
2187
2188 error_splat_super:
2189         up_write(&s->s_umount);
2190         deactivate_super(s);
2191         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2192         return error;
2193 }
2194
2195 #endif /* CONFIG_NFS_V4 */