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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/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 super_block *);
 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", __func__, -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 super_block *sb)
 651 {
 652         struct nfs_server *server = NFS_SB(sb);
 653         struct rpc_clnt *rpc;
 654
 655         /* -EIO all pending I/O */
 656         rpc = server->client_acl;
 657         if (!IS_ERR(rpc))
 658                 rpc_killall_tasks(rpc);
 659         rpc = server->client;
 660         if (!IS_ERR(rpc))
 661                 rpc_killall_tasks(rpc);
 662 }
 663
 664 /*
 665  * Set the port number in an address.  Be agnostic about the address family.
 666  */
 667 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 668 {
 669         switch (sap->sa_family) {
 670         case AF_INET: {
 671                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 672                 ap->sin_port = htons(port);
 673                 break;
 674         }
 675         case AF_INET6: {
 676                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 677                 ap->sin6_port = htons(port);
 678                 break;
 679         }
 680         }
 681 }
 682
 683 /*
 684  * Sanity-check a server address provided by the mount command.
 685  *
 686  * Address family must be initialized, and address must not be
 687  * the ANY address for that family.
 688  */
 689 static int nfs_verify_server_address(struct sockaddr *addr)
 690 {
 691         switch (addr->sa_family) {
 692         case AF_INET: {
 693                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 694                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
 695         }
 696         case AF_INET6: {
 697                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 698                 return !ipv6_addr_any(sa);
 699         }
 700         }
 701
 702         return 0;
 703 }
 704
 705 /*
 706  * Parse string addresses passed in via a mount option,
 707  * and construct a sockaddr based on the result.
 708  *
 709  * If address parsing fails, set the sockaddr's address
 710  * family to AF_UNSPEC to force nfs_verify_server_address()
 711  * to punt the mount.
 712  */
 713 static void nfs_parse_server_address(char *value,
 714                                      struct sockaddr *sap,
 715                                      size_t *len)
 716 {
 717         if (strchr(value, ':')) {
 718                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 719                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 720
 721                 ap->sin6_family = AF_INET6;
 722                 *len = sizeof(*ap);
 723                 if (in6_pton(value, -1, addr, '\0', NULL))
 724                         return;
 725         } else {
 726                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 727                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 728
 729                 ap->sin_family = AF_INET;
 730                 *len = sizeof(*ap);
 731                 if (in4_pton(value, -1, addr, '\0', NULL))
 732                         return;
 733         }
 734
 735         sap->sa_family = AF_UNSPEC;
 736         *len = 0;
 737 }
 738
 739 /*
 740  * Error-check and convert a string of mount options from user space into
 741  * a data structure
 742  */
 743 static int nfs_parse_mount_options(char *raw,
 744                                    struct nfs_parsed_mount_data *mnt)
 745 {
 746         char *p, *string, *secdata;
 747         int rc;
 748
 749         if (!raw) {
 750                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 751                 return 1;
 752         }
 753         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 754
 755         secdata = alloc_secdata();
 756         if (!secdata)
 757                 goto out_nomem;
 758
 759         rc = security_sb_copy_data(raw, secdata);
 760         if (rc)
 761                 goto out_security_failure;
 762
 763         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 764         if (rc)
 765                 goto out_security_failure;
 766
 767         free_secdata(secdata);
 768
 769         while ((p = strsep(&raw, ",")) != NULL) {
 770                 substring_t args[MAX_OPT_ARGS];
 771                 int option, token;
 772
 773                 if (!*p)
 774                         continue;
 775
 776                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 777
 778                 token = match_token(p, nfs_mount_option_tokens, args);
 779                 switch (token) {
 780                 case Opt_soft:
 781                         mnt->flags |= NFS_MOUNT_SOFT;
 782                         break;
 783                 case Opt_hard:
 784                         mnt->flags &= ~NFS_MOUNT_SOFT;
 785                         break;
 786                 case Opt_intr:
 787                 case Opt_nointr:
 788                         break;
 789                 case Opt_posix:
 790                         mnt->flags |= NFS_MOUNT_POSIX;
 791                         break;
 792                 case Opt_noposix:
 793                         mnt->flags &= ~NFS_MOUNT_POSIX;
 794                         break;
 795                 case Opt_cto:
 796                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 797                         break;
 798                 case Opt_nocto:
 799                         mnt->flags |= NFS_MOUNT_NOCTO;
 800                         break;
 801                 case Opt_ac:
 802                         mnt->flags &= ~NFS_MOUNT_NOAC;
 803                         break;
 804                 case Opt_noac:
 805                         mnt->flags |= NFS_MOUNT_NOAC;
 806                         break;
 807                 case Opt_lock:
 808                         mnt->flags &= ~NFS_MOUNT_NONLM;
 809                         break;
 810                 case Opt_nolock:
 811                         mnt->flags |= NFS_MOUNT_NONLM;
 812                         break;
 813                 case Opt_v2:
 814                         mnt->flags &= ~NFS_MOUNT_VER3;
 815                         break;
 816                 case Opt_v3:
 817                         mnt->flags |= NFS_MOUNT_VER3;
 818                         break;
 819                 case Opt_udp:
 820                         mnt->flags &= ~NFS_MOUNT_TCP;
 821                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 822                         mnt->timeo = 7;
 823                         mnt->retrans = 5;
 824                         break;
 825                 case Opt_tcp:
 826                         mnt->flags |= NFS_MOUNT_TCP;
 827                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 828                         mnt->timeo = 600;
 829                         mnt->retrans = 2;
 830                         break;
 831                 case Opt_rdma:
 832                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 833                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 834                         mnt->timeo = 600;
 835                         mnt->retrans = 2;
 836                         break;
 837                 case Opt_acl:
 838                         mnt->flags &= ~NFS_MOUNT_NOACL;
 839                         break;
 840                 case Opt_noacl:
 841                         mnt->flags |= NFS_MOUNT_NOACL;
 842                         break;
 843                 case Opt_rdirplus:
 844                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 845                         break;
 846                 case Opt_nordirplus:
 847                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 848                         break;
 849                 case Opt_sharecache:
 850                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 851                         break;
 852                 case Opt_nosharecache:
 853                         mnt->flags |= NFS_MOUNT_UNSHARED;
 854                         break;
 855
 856                 case Opt_port:
 857                         if (match_int(args, &option))
 858                                 return 0;
 859                         if (option < 0 || option > 65535)
 860                                 return 0;
 861                         mnt->nfs_server.port = option;
 862                         break;
 863                 case Opt_rsize:
 864                         if (match_int(args, &mnt->rsize))
 865                                 return 0;
 866                         break;
 867                 case Opt_wsize:
 868                         if (match_int(args, &mnt->wsize))
 869                                 return 0;
 870                         break;
 871                 case Opt_bsize:
 872                         if (match_int(args, &option))
 873                                 return 0;
 874                         if (option < 0)
 875                                 return 0;
 876                         mnt->bsize = option;
 877                         break;
 878                 case Opt_timeo:
 879                         if (match_int(args, &mnt->timeo))
 880                                 return 0;
 881                         break;
 882                 case Opt_retrans:
 883                         if (match_int(args, &mnt->retrans))
 884                                 return 0;
 885                         break;
 886                 case Opt_acregmin:
 887                         if (match_int(args, &mnt->acregmin))
 888                                 return 0;
 889                         break;
 890                 case Opt_acregmax:
 891                         if (match_int(args, &mnt->acregmax))
 892                                 return 0;
 893                         break;
 894                 case Opt_acdirmin:
 895                         if (match_int(args, &mnt->acdirmin))
 896                                 return 0;
 897                         break;
 898                 case Opt_acdirmax:
 899                         if (match_int(args, &mnt->acdirmax))
 900                                 return 0;
 901                         break;
 902                 case Opt_actimeo:
 903                         if (match_int(args, &option))
 904                                 return 0;
 905                         if (option < 0)
 906                                 return 0;
 907                         mnt->acregmin =
 908                         mnt->acregmax =
 909                         mnt->acdirmin =
 910                         mnt->acdirmax = option;
 911                         break;
 912                 case Opt_namelen:
 913                         if (match_int(args, &mnt->namlen))
 914                                 return 0;
 915                         break;
 916                 case Opt_mountport:
 917                         if (match_int(args, &option))
 918                                 return 0;
 919                         if (option < 0 || option > 65535)
 920                                 return 0;
 921                         mnt->mount_server.port = option;
 922                         break;
 923                 case Opt_mountvers:
 924                         if (match_int(args, &option))
 925                                 return 0;
 926                         if (option < 0)
 927                                 return 0;
 928                         mnt->mount_server.version = option;
 929                         break;
 930                 case Opt_nfsvers:
 931                         if (match_int(args, &option))
 932                                 return 0;
 933                         switch (option) {
 934                         case 2:
 935                                 mnt->flags &= ~NFS_MOUNT_VER3;
 936                                 break;
 937                         case 3:
 938                                 mnt->flags |= NFS_MOUNT_VER3;
 939                                 break;
 940                         default:
 941                                 goto out_unrec_vers;
 942                         }
 943                         break;
 944
 945                 case Opt_sec:
 946                         string = match_strdup(args);
 947                         if (string == NULL)
 948                                 goto out_nomem;
 949                         token = match_token(string, nfs_secflavor_tokens, args);
 950                         kfree(string);
 951
 952                         /*
 953                          * The flags setting is for v2/v3.  The flavor_len
 954                          * setting is for v4.  v2/v3 also need to know the
 955                          * difference between NULL and UNIX.
 956                          */
 957                         switch (token) {
 958                         case Opt_sec_none:
 959                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 960                                 mnt->auth_flavor_len = 0;
 961                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 962                                 break;
 963                         case Opt_sec_sys:
 964                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 965                                 mnt->auth_flavor_len = 0;
 966                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 967                                 break;
 968                         case Opt_sec_krb5:
 969                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 970                                 mnt->auth_flavor_len = 1;
 971                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 972                                 break;
 973                         case Opt_sec_krb5i:
 974                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 975                                 mnt->auth_flavor_len = 1;
 976                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 977                                 break;
 978                         case Opt_sec_krb5p:
 979                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 980                                 mnt->auth_flavor_len = 1;
 981                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 982                                 break;
 983                         case Opt_sec_lkey:
 984                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 985                                 mnt->auth_flavor_len = 1;
 986                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 987                                 break;
 988                         case Opt_sec_lkeyi:
 989                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 990                                 mnt->auth_flavor_len = 1;
 991                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 992                                 break;
 993                         case Opt_sec_lkeyp:
 994                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 995                                 mnt->auth_flavor_len = 1;
 996                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
 997                                 break;
 998                         case Opt_sec_spkm:
 999                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1000                                 mnt->auth_flavor_len = 1;
1001                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1002                                 break;
1003                         case Opt_sec_spkmi:
1004                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1005                                 mnt->auth_flavor_len = 1;
1006                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1007                                 break;
1008                         case Opt_sec_spkmp:
1009                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010                                 mnt->auth_flavor_len = 1;
1011                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1012                                 break;
1013                         default:
1014                                 goto out_unrec_sec;
1015                         }
1016                         break;
1017                 case Opt_proto:
1018                         string = match_strdup(args);
1019                         if (string == NULL)
1020                                 goto out_nomem;
1021                         token = match_token(string,
1022                                             nfs_xprt_protocol_tokens, args);
1023                         kfree(string);
1024
1025                         switch (token) {
1026                         case Opt_xprt_udp:
1027                                 mnt->flags &= ~NFS_MOUNT_TCP;
1028                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1029                                 mnt->timeo = 7;
1030                                 mnt->retrans = 5;
1031                                 break;
1032                         case Opt_xprt_tcp:
1033                                 mnt->flags |= NFS_MOUNT_TCP;
1034                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035                                 mnt->timeo = 600;
1036                                 mnt->retrans = 2;
1037                                 break;
1038                         case Opt_xprt_rdma:
1039                                 /* vector side protocols to TCP */
1040                                 mnt->flags |= NFS_MOUNT_TCP;
1041                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1042                                 mnt->timeo = 600;
1043                                 mnt->retrans = 2;
1044                                 break;
1045                         default:
1046                                 goto out_unrec_xprt;
1047                         }
1048                         break;
1049                 case Opt_mountproto:
1050                         string = match_strdup(args);
1051                         if (string == NULL)
1052                                 goto out_nomem;
1053                         token = match_token(string,
1054                                             nfs_xprt_protocol_tokens, args);
1055                         kfree(string);
1056
1057                         switch (token) {
1058                         case Opt_xprt_udp:
1059                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1060                                 break;
1061                         case Opt_xprt_tcp:
1062                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1063                                 break;
1064                         case Opt_xprt_rdma: /* not used for side protocols */
1065                         default:
1066                                 goto out_unrec_xprt;
1067                         }
1068                         break;
1069                 case Opt_addr:
1070                         string = match_strdup(args);
1071                         if (string == NULL)
1072                                 goto out_nomem;
1073                         nfs_parse_server_address(string, (struct sockaddr *)
1074                                                  &mnt->nfs_server.address,
1075                                                  &mnt->nfs_server.addrlen);
1076                         kfree(string);
1077                         break;
1078                 case Opt_clientaddr:
1079                         string = match_strdup(args);
1080                         if (string == NULL)
1081                                 goto out_nomem;
1082                         kfree(mnt->client_address);
1083                         mnt->client_address = string;
1084                         break;
1085                 case Opt_mounthost:
1086                         string = match_strdup(args);
1087                         if (string == NULL)
1088                                 goto out_nomem;
1089                         kfree(mnt->mount_server.hostname);
1090                         mnt->mount_server.hostname = string;
1091                         break;
1092                 case Opt_mountaddr:
1093                         string = match_strdup(args);
1094                         if (string == NULL)
1095                                 goto out_nomem;
1096                         nfs_parse_server_address(string, (struct sockaddr *)
1097                                                  &mnt->mount_server.address,
1098                                                  &mnt->mount_server.addrlen);
1099                         kfree(string);
1100                         break;
1101
1102                 case Opt_userspace:
1103                 case Opt_deprecated:
1104                         break;
1105
1106                 default:
1107                         goto out_unknown;
1108                 }
1109         }
1110
1111         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1112                                 mnt->nfs_server.port);
1113
1114         return 1;
1115
1116 out_nomem:
1117         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1118         return 0;
1119 out_security_failure:
1120         free_secdata(secdata);
1121         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1122         return 0;
1123 out_unrec_vers:
1124         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1125         return 0;
1126
1127 out_unrec_xprt:
1128         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1129         return 0;
1130
1131 out_unrec_sec:
1132         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1133         return 0;
1134
1135 out_unknown:
1136         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1137         return 0;
1138 }
1139
1140 /*
1141  * Use the remote server's MOUNT service to request the NFS file handle
1142  * corresponding to the provided path.
1143  */
1144 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1145                          struct nfs_fh *root_fh)
1146 {
1147         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1148         char *hostname;
1149         int status;
1150
1151         if (args->mount_server.version == 0) {
1152                 if (args->flags & NFS_MOUNT_VER3)
1153                         args->mount_server.version = NFS_MNT3_VERSION;
1154                 else
1155                         args->mount_server.version = NFS_MNT_VERSION;
1156         }
1157
1158         if (args->mount_server.hostname)
1159                 hostname = args->mount_server.hostname;
1160         else
1161                 hostname = args->nfs_server.hostname;
1162
1163         /*
1164          * Construct the mount server's address.
1165          */
1166         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1167                 memcpy(sap, &args->nfs_server.address,
1168                        args->nfs_server.addrlen);
1169                 args->mount_server.addrlen = args->nfs_server.addrlen;
1170         }
1171
1172         /*
1173          * autobind will be used if mount_server.port == 0
1174          */
1175         nfs_set_port(sap, args->mount_server.port);
1176
1177         /*
1178          * Now ask the mount server to map our export path
1179          * to a file handle.
1180          */
1181         status = nfs_mount(sap,
1182                            args->mount_server.addrlen,
1183                            hostname,
1184                            args->nfs_server.export_path,
1185                            args->mount_server.version,
1186                            args->mount_server.protocol,
1187                            root_fh);
1188         if (status == 0)
1189                 return 0;
1190
1191         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1192                         hostname, status);
1193         return status;
1194 }
1195
1196 /*
1197  * Validate the NFS2/NFS3 mount data
1198  * - fills in the mount root filehandle
1199  *
1200  * For option strings, user space handles the following behaviors:
1201  *
1202  * + DNS: mapping server host name to IP address ("addr=" option)
1203  *
1204  * + failure mode: how to behave if a mount request can't be handled
1205  *   immediately ("fg/bg" option)
1206  *
1207  * + retry: how often to retry a mount request ("retry=" option)
1208  *
1209  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1210  *   mountproto=tcp after mountproto=udp, and so on
1211  */
1212 static int nfs_validate_mount_data(void *options,
1213                                    struct nfs_parsed_mount_data *args,
1214                                    struct nfs_fh *mntfh,
1215                                    const char *dev_name)
1216 {
1217         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1218
1219         if (data == NULL)
1220                 goto out_no_data;
1221
1222         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1223         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1224         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1225         args->timeo             = 600;
1226         args->retrans           = 2;
1227         args->acregmin          = 3;
1228         args->acregmax          = 60;
1229         args->acdirmin          = 30;
1230         args->acdirmax          = 60;
1231         args->mount_server.port = 0;    /* autobind unless user sets port */
1232         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1233         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1234         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1235
1236         switch (data->version) {
1237         case 1:
1238                 data->namlen = 0;
1239         case 2:
1240                 data->bsize = 0;
1241         case 3:
1242                 if (data->flags & NFS_MOUNT_VER3)
1243                         goto out_no_v3;
1244                 data->root.size = NFS2_FHSIZE;
1245                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1246         case 4:
1247                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1248                         goto out_no_sec;
1249         case 5:
1250                 memset(data->context, 0, sizeof(data->context));
1251         case 6:
1252                 if (data->flags & NFS_MOUNT_VER3) {
1253                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1254                                 goto out_invalid_fh;
1255                         mntfh->size = data->root.size;
1256                 } else
1257                         mntfh->size = NFS2_FHSIZE;
1258
1259
1260                 memcpy(mntfh->data, data->root.data, mntfh->size);
1261                 if (mntfh->size < sizeof(mntfh->data))
1262                         memset(mntfh->data + mntfh->size, 0,
1263                                sizeof(mntfh->data) - mntfh->size);
1264
1265                 /*
1266                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1267                  * can deal with.
1268                  */
1269                 args->flags             = data->flags;
1270                 args->rsize             = data->rsize;
1271                 args->wsize             = data->wsize;
1272                 args->timeo             = data->timeo;
1273                 args->retrans           = data->retrans;
1274                 args->acregmin          = data->acregmin;
1275                 args->acregmax          = data->acregmax;
1276                 args->acdirmin          = data->acdirmin;
1277                 args->acdirmax          = data->acdirmax;
1278
1279                 memcpy(&args->nfs_server.address, &data->addr,
1280                        sizeof(data->addr));
1281                 args->nfs_server.addrlen = sizeof(data->addr);
1282                 if (!nfs_verify_server_address((struct sockaddr *)
1283                                                 &args->nfs_server.address))
1284                         goto out_no_address;
1285
1286                 if (!(data->flags & NFS_MOUNT_TCP))
1287                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1288                 /* N.B. caller will free nfs_server.hostname in all cases */
1289                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1290                 args->namlen            = data->namlen;
1291                 args->bsize             = data->bsize;
1292                 args->auth_flavors[0]   = data->pseudoflavor;
1293                 if (!args->nfs_server.hostname)
1294                         goto out_nomem;
1295
1296                 /*
1297                  * The legacy version 6 binary mount data from userspace has a
1298                  * field used only to transport selinux information into the
1299                  * the kernel.  To continue to support that functionality we
1300                  * have a touch of selinux knowledge here in the NFS code. The
1301                  * userspace code converted context=blah to just blah so we are
1302                  * converting back to the full string selinux understands.
1303                  */
1304                 if (data->context[0]){
1305 #ifdef CONFIG_SECURITY_SELINUX
1306                         int rc;
1307                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1308                         if (!opts_str)
1309                                 return -ENOMEM;
1310                         strcpy(opts_str, "context=");
1311                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1312                         strcat(opts_str, &data->context[0]);
1313                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1314                         kfree(opts_str);
1315                         if (rc)
1316                                 return rc;
1317 #else
1318                         return -EINVAL;
1319 #endif
1320                 }
1321
1322                 break;
1323         default: {
1324                 unsigned int len;
1325                 char *c;
1326                 int status;
1327
1328                 if (nfs_parse_mount_options((char *)options, args) == 0)
1329                         return -EINVAL;
1330
1331                 if (!nfs_verify_server_address((struct sockaddr *)
1332                                                 &args->nfs_server.address))
1333                         goto out_no_address;
1334
1335                 c = strchr(dev_name, ':');
1336                 if (c == NULL)
1337                         return -EINVAL;
1338                 len = c - dev_name;
1339                 /* N.B. caller will free nfs_server.hostname in all cases */
1340                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1341                 if (!args->nfs_server.hostname)
1342                         goto out_nomem;
1343
1344                 c++;
1345                 if (strlen(c) > NFS_MAXPATHLEN)
1346                         return -ENAMETOOLONG;
1347                 args->nfs_server.export_path = c;
1348
1349                 status = nfs_try_mount(args, mntfh);
1350                 if (status)
1351                         return status;
1352
1353                 break;
1354                 }
1355         }
1356
1357         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1358                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1359
1360 #ifndef CONFIG_NFS_V3
1361         if (args->flags & NFS_MOUNT_VER3)
1362                 goto out_v3_not_compiled;
1363 #endif /* !CONFIG_NFS_V3 */
1364
1365         return 0;
1366
1367 out_no_data:
1368         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1369         return -EINVAL;
1370
1371 out_no_v3:
1372         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1373                  data->version);
1374         return -EINVAL;
1375
1376 out_no_sec:
1377         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1378         return -EINVAL;
1379
1380 #ifndef CONFIG_NFS_V3
1381 out_v3_not_compiled:
1382         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1383         return -EPROTONOSUPPORT;
1384 #endif /* !CONFIG_NFS_V3 */
1385
1386 out_nomem:
1387         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1388         return -ENOMEM;
1389
1390 out_no_address:
1391         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1392         return -EINVAL;
1393
1394 out_invalid_fh:
1395         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1396         return -EINVAL;
1397 }
1398
1399 /*
1400  * Initialise the common bits of the superblock
1401  */
1402 static inline void nfs_initialise_sb(struct super_block *sb)
1403 {
1404         struct nfs_server *server = NFS_SB(sb);
1405
1406         sb->s_magic = NFS_SUPER_MAGIC;
1407
1408         /* We probably want something more informative here */
1409         snprintf(sb->s_id, sizeof(sb->s_id),
1410                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1411
1412         if (sb->s_blocksize == 0)
1413                 sb->s_blocksize = nfs_block_bits(server->wsize,
1414                                                  &sb->s_blocksize_bits);
1415
1416         if (server->flags & NFS_MOUNT_NOAC)
1417                 sb->s_flags |= MS_SYNCHRONOUS;
1418
1419         nfs_super_set_maxbytes(sb, server->maxfilesize);
1420 }
1421
1422 /*
1423  * Finish setting up an NFS2/3 superblock
1424  */
1425 static void nfs_fill_super(struct super_block *sb,
1426                            struct nfs_parsed_mount_data *data)
1427 {
1428         struct nfs_server *server = NFS_SB(sb);
1429
1430         sb->s_blocksize_bits = 0;
1431         sb->s_blocksize = 0;
1432         if (data->bsize)
1433                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1434
1435         if (server->flags & NFS_MOUNT_VER3) {
1436                 /* The VFS shouldn't apply the umask to mode bits. We will do
1437                  * so ourselves when necessary.
1438                  */
1439                 sb->s_flags |= MS_POSIXACL;
1440                 sb->s_time_gran = 1;
1441         }
1442
1443         sb->s_op = &nfs_sops;
1444         nfs_initialise_sb(sb);
1445 }
1446
1447 /*
1448  * Finish setting up a cloned NFS2/3 superblock
1449  */
1450 static void nfs_clone_super(struct super_block *sb,
1451                             const struct super_block *old_sb)
1452 {
1453         struct nfs_server *server = NFS_SB(sb);
1454
1455         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1456         sb->s_blocksize = old_sb->s_blocksize;
1457         sb->s_maxbytes = old_sb->s_maxbytes;
1458
1459         if (server->flags & NFS_MOUNT_VER3) {
1460                 /* The VFS shouldn't apply the umask to mode bits. We will do
1461                  * so ourselves when necessary.
1462                  */
1463                 sb->s_flags |= MS_POSIXACL;
1464                 sb->s_time_gran = 1;
1465         }
1466
1467         sb->s_op = old_sb->s_op;
1468         nfs_initialise_sb(sb);
1469 }
1470
1471 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1472
1473 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1474 {
1475         const struct nfs_server *a = s->s_fs_info;
1476         const struct rpc_clnt *clnt_a = a->client;
1477         const struct rpc_clnt *clnt_b = b->client;
1478
1479         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1480                 goto Ebusy;
1481         if (a->nfs_client != b->nfs_client)
1482                 goto Ebusy;
1483         if (a->flags != b->flags)
1484                 goto Ebusy;
1485         if (a->wsize != b->wsize)
1486                 goto Ebusy;
1487         if (a->rsize != b->rsize)
1488                 goto Ebusy;
1489         if (a->acregmin != b->acregmin)
1490                 goto Ebusy;
1491         if (a->acregmax != b->acregmax)
1492                 goto Ebusy;
1493         if (a->acdirmin != b->acdirmin)
1494                 goto Ebusy;
1495         if (a->acdirmax != b->acdirmax)
1496                 goto Ebusy;
1497         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1498                 goto Ebusy;
1499         return 1;
1500 Ebusy:
1501         return 0;
1502 }
1503
1504 struct nfs_sb_mountdata {
1505         struct nfs_server *server;
1506         int mntflags;
1507 };
1508
1509 static int nfs_set_super(struct super_block *s, void *data)
1510 {
1511         struct nfs_sb_mountdata *sb_mntdata = data;
1512         struct nfs_server *server = sb_mntdata->server;
1513         int ret;
1514
1515         s->s_flags = sb_mntdata->mntflags;
1516         s->s_fs_info = server;
1517         ret = set_anon_super(s, server);
1518         if (ret == 0)
1519                 server->s_dev = s->s_dev;
1520         return ret;
1521 }
1522
1523 static int nfs_compare_super_address(struct nfs_server *server1,
1524                                      struct nfs_server *server2)
1525 {
1526         struct sockaddr *sap1, *sap2;
1527
1528         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1529         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1530
1531         if (sap1->sa_family != sap2->sa_family)
1532                 return 0;
1533
1534         switch (sap1->sa_family) {
1535         case AF_INET: {
1536                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1537                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1538                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1539                         return 0;
1540                 if (sin1->sin_port != sin2->sin_port)
1541                         return 0;
1542                 break;
1543         }
1544         case AF_INET6: {
1545                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1546                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1547                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1548                         return 0;
1549                 if (sin1->sin6_port != sin2->sin6_port)
1550                         return 0;
1551                 break;
1552         }
1553         default:
1554                 return 0;
1555         }
1556
1557         return 1;
1558 }
1559
1560 static int nfs_compare_super(struct super_block *sb, void *data)
1561 {
1562         struct nfs_sb_mountdata *sb_mntdata = data;
1563         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1564         int mntflags = sb_mntdata->mntflags;
1565
1566         if (!nfs_compare_super_address(old, server))
1567                 return 0;
1568         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1569         if (old->flags & NFS_MOUNT_UNSHARED)
1570                 return 0;
1571         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1572                 return 0;
1573         return nfs_compare_mount_options(sb, server, mntflags);
1574 }
1575
1576 static int nfs_bdi_register(struct nfs_server *server)
1577 {
1578         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1579 }
1580
1581 static int nfs_get_sb(struct file_system_type *fs_type,
1582         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1583 {
1584         struct nfs_server *server = NULL;
1585         struct super_block *s;
1586         struct nfs_parsed_mount_data *data;
1587         struct nfs_fh *mntfh;
1588         struct dentry *mntroot;
1589         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1590         struct nfs_sb_mountdata sb_mntdata = {
1591                 .mntflags = flags,
1592         };
1593         int error = -ENOMEM;
1594
1595         data = kzalloc(sizeof(*data), GFP_KERNEL);
1596         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1597         if (data == NULL || mntfh == NULL)
1598                 goto out_free_fh;
1599
1600         security_init_mnt_opts(&data->lsm_opts);
1601
1602         /* Validate the mount data */
1603         error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1604         if (error < 0)
1605                 goto out;
1606
1607         /* Get a volume representation */
1608         server = nfs_create_server(data, mntfh);
1609         if (IS_ERR(server)) {
1610                 error = PTR_ERR(server);
1611                 goto out;
1612         }
1613         sb_mntdata.server = server;
1614
1615         if (server->flags & NFS_MOUNT_UNSHARED)
1616                 compare_super = NULL;
1617
1618         /* Get a superblock - note that we may end up sharing one that already exists */
1619         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1620         if (IS_ERR(s)) {
1621                 error = PTR_ERR(s);
1622                 goto out_err_nosb;
1623         }
1624
1625         if (s->s_fs_info != server) {
1626                 nfs_free_server(server);
1627                 server = NULL;
1628         } else {
1629                 error = nfs_bdi_register(server);
1630                 if (error)
1631                         goto error_splat_super;
1632         }
1633
1634         if (!s->s_root) {
1635                 /* initial superblock/root creation */
1636                 nfs_fill_super(s, data);
1637         }
1638
1639         mntroot = nfs_get_root(s, mntfh);
1640         if (IS_ERR(mntroot)) {
1641                 error = PTR_ERR(mntroot);
1642                 goto error_splat_super;
1643         }
1644
1645         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1646         if (error)
1647                 goto error_splat_root;
1648
1649         s->s_flags |= MS_ACTIVE;
1650         mnt->mnt_sb = s;
1651         mnt->mnt_root = mntroot;
1652         error = 0;
1653
1654 out:
1655         kfree(data->nfs_server.hostname);
1656         kfree(data->mount_server.hostname);
1657         security_free_mnt_opts(&data->lsm_opts);
1658 out_free_fh:
1659         kfree(mntfh);
1660         kfree(data);
1661         return error;
1662
1663 out_err_nosb:
1664         nfs_free_server(server);
1665         goto out;
1666
1667 error_splat_root:
1668         dput(mntroot);
1669 error_splat_super:
1670         up_write(&s->s_umount);
1671         deactivate_super(s);
1672         goto out;
1673 }
1674
1675 /*
1676  * Destroy an NFS2/3 superblock
1677  */
1678 static void nfs_kill_super(struct super_block *s)
1679 {
1680         struct nfs_server *server = NFS_SB(s);
1681
1682         bdi_unregister(&server->backing_dev_info);
1683         kill_anon_super(s);
1684         nfs_free_server(server);
1685 }
1686
1687 /*
1688  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1689  */
1690 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1691                            const char *dev_name, void *raw_data,
1692                            struct vfsmount *mnt)
1693 {
1694         struct nfs_clone_mount *data = raw_data;
1695         struct super_block *s;
1696         struct nfs_server *server;
1697         struct dentry *mntroot;
1698         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1699         struct nfs_sb_mountdata sb_mntdata = {
1700                 .mntflags = flags,
1701         };
1702         int error;
1703
1704         dprintk("--> nfs_xdev_get_sb()\n");
1705
1706         /* create a new volume representation */
1707         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1708         if (IS_ERR(server)) {
1709                 error = PTR_ERR(server);
1710                 goto out_err_noserver;
1711         }
1712         sb_mntdata.server = server;
1713
1714         if (server->flags & NFS_MOUNT_UNSHARED)
1715                 compare_super = NULL;
1716
1717         /* Get a superblock - note that we may end up sharing one that already exists */
1718         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1719         if (IS_ERR(s)) {
1720                 error = PTR_ERR(s);
1721                 goto out_err_nosb;
1722         }
1723
1724         if (s->s_fs_info != server) {
1725                 nfs_free_server(server);
1726                 server = NULL;
1727         } else {
1728                 error = nfs_bdi_register(server);
1729                 if (error)
1730                         goto error_splat_super;
1731         }
1732
1733         if (!s->s_root) {
1734                 /* initial superblock/root creation */
1735                 nfs_clone_super(s, data->sb);
1736         }
1737
1738         mntroot = nfs_get_root(s, data->fh);
1739         if (IS_ERR(mntroot)) {
1740                 error = PTR_ERR(mntroot);
1741                 goto error_splat_super;
1742         }
1743         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1744                 dput(mntroot);
1745                 error = -ESTALE;
1746                 goto error_splat_super;
1747         }
1748
1749         s->s_flags |= MS_ACTIVE;
1750         mnt->mnt_sb = s;
1751         mnt->mnt_root = mntroot;
1752
1753         /* clone any lsm security options from the parent to the new sb */
1754         security_sb_clone_mnt_opts(data->sb, s);
1755
1756         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1757         return 0;
1758
1759 out_err_nosb:
1760         nfs_free_server(server);
1761 out_err_noserver:
1762         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1763         return error;
1764
1765 error_splat_super:
1766         up_write(&s->s_umount);
1767         deactivate_super(s);
1768         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1769         return error;
1770 }
1771
1772 #ifdef CONFIG_NFS_V4
1773
1774 /*
1775  * Finish setting up a cloned NFS4 superblock
1776  */
1777 static void nfs4_clone_super(struct super_block *sb,
1778                             const struct super_block *old_sb)
1779 {
1780         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1781         sb->s_blocksize = old_sb->s_blocksize;
1782         sb->s_maxbytes = old_sb->s_maxbytes;
1783         sb->s_time_gran = 1;
1784         sb->s_op = old_sb->s_op;
1785         nfs_initialise_sb(sb);
1786 }
1787
1788 /*
1789  * Set up an NFS4 superblock
1790  */
1791 static void nfs4_fill_super(struct super_block *sb)
1792 {
1793         sb->s_time_gran = 1;
1794         sb->s_op = &nfs4_sops;
1795         nfs_initialise_sb(sb);
1796 }
1797
1798 /*
1799  * Validate NFSv4 mount options
1800  */
1801 static int nfs4_validate_mount_data(void *options,
1802                                     struct nfs_parsed_mount_data *args,
1803                                     const char *dev_name)
1804 {
1805         struct sockaddr_in *ap;
1806         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1807         char *c;
1808
1809         if (data == NULL)
1810                 goto out_no_data;
1811
1812         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1813         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1814         args->timeo             = 600;
1815         args->retrans           = 2;
1816         args->acregmin          = 3;
1817         args->acregmax          = 60;
1818         args->acdirmin          = 30;
1819         args->acdirmax          = 60;
1820         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1821         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1822
1823         switch (data->version) {
1824         case 1:
1825                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1826                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1827                         goto out_no_address;
1828                 if (data->host_addrlen == 0)
1829                         goto out_no_address;
1830                 args->nfs_server.addrlen = data->host_addrlen;
1831                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1832                         return -EFAULT;
1833                 if (!nfs_verify_server_address((struct sockaddr *)
1834                                                 &args->nfs_server.address))
1835                         goto out_no_address;
1836
1837                 switch (data->auth_flavourlen) {
1838                 case 0:
1839                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1840                         break;
1841                 case 1:
1842                         if (copy_from_user(&args->auth_flavors[0],
1843                                            data->auth_flavours,
1844                                            sizeof(args->auth_flavors[0])))
1845                                 return -EFAULT;
1846                         break;
1847                 default:
1848                         goto out_inval_auth;
1849                 }
1850
1851                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1852                 if (IS_ERR(c))
1853                         return PTR_ERR(c);
1854                 args->nfs_server.hostname = c;
1855
1856                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1857                 if (IS_ERR(c))
1858                         return PTR_ERR(c);
1859                 args->nfs_server.export_path = c;
1860                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1861
1862                 c = strndup_user(data->client_addr.data, 16);
1863                 if (IS_ERR(c))
1864                         return PTR_ERR(c);
1865                 args->client_address = c;
1866
1867                 /*
1868                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1869                  * can deal with.
1870                  */
1871
1872                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1873                 args->rsize     = data->rsize;
1874                 args->wsize     = data->wsize;
1875                 args->timeo     = data->timeo;
1876                 args->retrans   = data->retrans;
1877                 args->acregmin  = data->acregmin;
1878                 args->acregmax  = data->acregmax;
1879                 args->acdirmin  = data->acdirmin;
1880                 args->acdirmax  = data->acdirmax;
1881                 args->nfs_server.protocol = data->proto;
1882
1883                 break;
1884         default: {
1885                 unsigned int len;
1886
1887                 if (nfs_parse_mount_options((char *)options, args) == 0)
1888                         return -EINVAL;
1889
1890                 if (!nfs_verify_server_address((struct sockaddr *)
1891                                                 &args->nfs_server.address))
1892                         return -EINVAL;
1893
1894                 switch (args->auth_flavor_len) {
1895                 case 0:
1896                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1897                         break;
1898                 case 1:
1899                         break;
1900                 default:
1901                         goto out_inval_auth;
1902                 }
1903
1904                 /*
1905                  * Split "dev_name" into "hostname:mntpath".
1906                  */
1907                 c = strchr(dev_name, ':');
1908                 if (c == NULL)
1909                         return -EINVAL;
1910                 /* while calculating len, pretend ':' is '\0' */
1911                 len = c - dev_name;
1912                 if (len > NFS4_MAXNAMLEN)
1913                         return -ENAMETOOLONG;
1914                 /* N.B. caller will free nfs_server.hostname in all cases */
1915                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1916                 if (!args->nfs_server.hostname)
1917                         goto out_nomem;
1918
1919                 c++;                    /* step over the ':' */
1920                 len = strlen(c);
1921                 if (len > NFS4_MAXPATHLEN)
1922                         return -ENAMETOOLONG;
1923                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1924                 if (!args->nfs_server.export_path)
1925                         goto out_nomem;
1926
1927                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1928
1929                 if (args->client_address == NULL)
1930                         goto out_no_client_address;
1931
1932                 break;
1933                 }
1934         }
1935
1936         return 0;
1937
1938 out_no_data:
1939         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1940         return -EINVAL;
1941
1942 out_inval_auth:
1943         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1944                  data->auth_flavourlen);
1945         return -EINVAL;
1946
1947 out_nomem:
1948         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1949         return -ENOMEM;
1950
1951 out_no_address:
1952         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1953         return -EINVAL;
1954
1955 out_no_client_address:
1956         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1957         return -EINVAL;
1958 }
1959
1960 /*
1961  * Get the superblock for an NFS4 mountpoint
1962  */
1963 static int nfs4_get_sb(struct file_system_type *fs_type,
1964         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1965 {
1966         struct nfs_parsed_mount_data *data;
1967         struct super_block *s;
1968         struct nfs_server *server;
1969         struct nfs_fh *mntfh;
1970         struct dentry *mntroot;
1971         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1972         struct nfs_sb_mountdata sb_mntdata = {
1973                 .mntflags = flags,
1974         };
1975         int error = -ENOMEM;
1976
1977         data = kzalloc(sizeof(*data), GFP_KERNEL);
1978         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1979         if (data == NULL || mntfh == NULL)
1980                 goto out_free_fh;
1981
1982         security_init_mnt_opts(&data->lsm_opts);
1983
1984         /* Validate the mount data */
1985         error = nfs4_validate_mount_data(raw_data, data, dev_name);
1986         if (error < 0)
1987                 goto out;
1988
1989         /* Get a volume representation */
1990         server = nfs4_create_server(data, mntfh);
1991         if (IS_ERR(server)) {
1992                 error = PTR_ERR(server);
1993                 goto out;
1994         }
1995         sb_mntdata.server = server;
1996
1997         if (server->flags & NFS4_MOUNT_UNSHARED)
1998                 compare_super = NULL;
1999
2000         /* Get a superblock - note that we may end up sharing one that already exists */
2001         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2002         if (IS_ERR(s)) {
2003                 error = PTR_ERR(s);
2004                 goto out_free;
2005         }
2006
2007         if (s->s_fs_info != server) {
2008                 nfs_free_server(server);
2009                 server = NULL;
2010         } else {
2011                 error = nfs_bdi_register(server);
2012                 if (error)
2013                         goto error_splat_super;
2014         }
2015
2016         if (!s->s_root) {
2017                 /* initial superblock/root creation */
2018                 nfs4_fill_super(s);
2019         }
2020
2021         mntroot = nfs4_get_root(s, mntfh);
2022         if (IS_ERR(mntroot)) {
2023                 error = PTR_ERR(mntroot);
2024                 goto error_splat_super;
2025         }
2026
2027         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2028         if (error)
2029                 goto error_splat_root;
2030
2031         s->s_flags |= MS_ACTIVE;
2032         mnt->mnt_sb = s;
2033         mnt->mnt_root = mntroot;
2034         error = 0;
2035
2036 out:
2037         kfree(data->client_address);
2038         kfree(data->nfs_server.export_path);
2039         kfree(data->nfs_server.hostname);
2040         security_free_mnt_opts(&data->lsm_opts);
2041 out_free_fh:
2042         kfree(mntfh);
2043         kfree(data);
2044         return error;
2045
2046 out_free:
2047         nfs_free_server(server);
2048         goto out;
2049
2050 error_splat_root:
2051         dput(mntroot);
2052 error_splat_super:
2053         up_write(&s->s_umount);
2054         deactivate_super(s);
2055         goto out;
2056 }
2057
2058 static void nfs4_kill_super(struct super_block *sb)
2059 {
2060         struct nfs_server *server = NFS_SB(sb);
2061
2062         nfs_return_all_delegations(sb);
2063         kill_anon_super(sb);
2064
2065         nfs4_renewd_prepare_shutdown(server);
2066         nfs_free_server(server);
2067 }
2068
2069 /*
2070  * Clone an NFS4 server record on xdev traversal (FSID-change)
2071  */
2072 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2073                             const char *dev_name, void *raw_data,
2074                             struct vfsmount *mnt)
2075 {
2076         struct nfs_clone_mount *data = raw_data;
2077         struct super_block *s;
2078         struct nfs_server *server;
2079         struct dentry *mntroot;
2080         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2081         struct nfs_sb_mountdata sb_mntdata = {
2082                 .mntflags = flags,
2083         };
2084         int error;
2085
2086         dprintk("--> nfs4_xdev_get_sb()\n");
2087
2088         /* create a new volume representation */
2089         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2090         if (IS_ERR(server)) {
2091                 error = PTR_ERR(server);
2092                 goto out_err_noserver;
2093         }
2094         sb_mntdata.server = server;
2095
2096         if (server->flags & NFS4_MOUNT_UNSHARED)
2097                 compare_super = NULL;
2098
2099         /* Get a superblock - note that we may end up sharing one that already exists */
2100         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2101         if (IS_ERR(s)) {
2102                 error = PTR_ERR(s);
2103                 goto out_err_nosb;
2104         }
2105
2106         if (s->s_fs_info != server) {
2107                 nfs_free_server(server);
2108                 server = NULL;
2109         } else {
2110                 error = nfs_bdi_register(server);
2111                 if (error)
2112                         goto error_splat_super;
2113         }
2114
2115         if (!s->s_root) {
2116                 /* initial superblock/root creation */
2117                 nfs4_clone_super(s, data->sb);
2118         }
2119
2120         mntroot = nfs4_get_root(s, data->fh);
2121         if (IS_ERR(mntroot)) {
2122                 error = PTR_ERR(mntroot);
2123                 goto error_splat_super;
2124         }
2125         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2126                 dput(mntroot);
2127                 error = -ESTALE;
2128                 goto error_splat_super;
2129         }
2130
2131         s->s_flags |= MS_ACTIVE;
2132         mnt->mnt_sb = s;
2133         mnt->mnt_root = mntroot;
2134
2135         security_sb_clone_mnt_opts(data->sb, s);
2136
2137         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2138         return 0;
2139
2140 out_err_nosb:
2141         nfs_free_server(server);
2142 out_err_noserver:
2143         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2144         return error;
2145
2146 error_splat_super:
2147         up_write(&s->s_umount);
2148         deactivate_super(s);
2149         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2150         return error;
2151 }
2152
2153 /*
2154  * Create an NFS4 server record on referral traversal
2155  */
2156 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2157                                 const char *dev_name, void *raw_data,
2158                                 struct vfsmount *mnt)
2159 {
2160         struct nfs_clone_mount *data = raw_data;
2161         struct super_block *s;
2162         struct nfs_server *server;
2163         struct dentry *mntroot;
2164         struct nfs_fh mntfh;
2165         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2166         struct nfs_sb_mountdata sb_mntdata = {
2167                 .mntflags = flags,
2168         };
2169         int error;
2170
2171         dprintk("--> nfs4_referral_get_sb()\n");
2172
2173         /* create a new volume representation */
2174         server = nfs4_create_referral_server(data, &mntfh);
2175         if (IS_ERR(server)) {
2176                 error = PTR_ERR(server);
2177                 goto out_err_noserver;
2178         }
2179         sb_mntdata.server = server;
2180
2181         if (server->flags & NFS4_MOUNT_UNSHARED)
2182                 compare_super = NULL;
2183
2184         /* Get a superblock - note that we may end up sharing one that already exists */
2185         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2186         if (IS_ERR(s)) {
2187                 error = PTR_ERR(s);
2188                 goto out_err_nosb;
2189         }
2190
2191         if (s->s_fs_info != server) {
2192                 nfs_free_server(server);
2193                 server = NULL;
2194         } else {
2195                 error = nfs_bdi_register(server);
2196                 if (error)
2197                         goto error_splat_super;
2198         }
2199
2200         if (!s->s_root) {
2201                 /* initial superblock/root creation */
2202                 nfs4_fill_super(s);
2203         }
2204
2205         mntroot = nfs4_get_root(s, &mntfh);
2206         if (IS_ERR(mntroot)) {
2207                 error = PTR_ERR(mntroot);
2208                 goto error_splat_super;
2209         }
2210         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2211                 dput(mntroot);
2212                 error = -ESTALE;
2213                 goto error_splat_super;
2214         }
2215
2216         s->s_flags |= MS_ACTIVE;
2217         mnt->mnt_sb = s;
2218         mnt->mnt_root = mntroot;
2219
2220         security_sb_clone_mnt_opts(data->sb, s);
2221
2222         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2223         return 0;
2224
2225 out_err_nosb:
2226         nfs_free_server(server);
2227 out_err_noserver:
2228         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2229         return error;
2230
2231 error_splat_super:
2232         up_write(&s->s_umount);
2233         deactivate_super(s);
2234         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2235         return error;
2236 }
2237
2238 #endif /* CONFIG_NFS_V4 */