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 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 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 211
 212 static struct file_system_type nfs_fs_type = {
 213         .owner          = THIS_MODULE,
 214         .name           = "nfs",
 215         .get_sb         = nfs_get_sb,
 216         .kill_sb        = nfs_kill_super,
 217         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 218 };
 219
 220 struct file_system_type nfs_xdev_fs_type = {
 221         .owner          = THIS_MODULE,
 222         .name           = "nfs",
 223         .get_sb         = nfs_xdev_get_sb,
 224         .kill_sb        = nfs_kill_super,
 225         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 226 };
 227
 228 static const struct super_operations nfs_sops = {
 229         .alloc_inode    = nfs_alloc_inode,
 230         .destroy_inode  = nfs_destroy_inode,
 231         .write_inode    = nfs_write_inode,
 232         .put_super      = nfs_put_super,
 233         .statfs         = nfs_statfs,
 234         .clear_inode    = nfs_clear_inode,
 235         .umount_begin   = nfs_umount_begin,
 236         .show_options   = nfs_show_options,
 237         .show_stats     = nfs_show_stats,
 238         .remount_fs     = nfs_remount,
 239 };
 240
 241 #ifdef CONFIG_NFS_V4
 242 static int nfs4_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_xdev_get_sb(struct file_system_type *fs_type,
 245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 246 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 247         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 248 static void nfs4_kill_super(struct super_block *sb);
 249
 250 static struct file_system_type nfs4_fs_type = {
 251         .owner          = THIS_MODULE,
 252         .name           = "nfs4",
 253         .get_sb         = nfs4_get_sb,
 254         .kill_sb        = nfs4_kill_super,
 255         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 256 };
 257
 258 struct file_system_type nfs4_xdev_fs_type = {
 259         .owner          = THIS_MODULE,
 260         .name           = "nfs4",
 261         .get_sb         = nfs4_xdev_get_sb,
 262         .kill_sb        = nfs4_kill_super,
 263         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 264 };
 265
 266 struct file_system_type nfs4_referral_fs_type = {
 267         .owner          = THIS_MODULE,
 268         .name           = "nfs4",
 269         .get_sb         = nfs4_referral_get_sb,
 270         .kill_sb        = nfs4_kill_super,
 271         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 272 };
 273
 274 static const struct super_operations nfs4_sops = {
 275         .alloc_inode    = nfs_alloc_inode,
 276         .destroy_inode  = nfs_destroy_inode,
 277         .write_inode    = nfs_write_inode,
 278         .statfs         = nfs_statfs,
 279         .clear_inode    = nfs4_clear_inode,
 280         .umount_begin   = nfs_umount_begin,
 281         .show_options   = nfs_show_options,
 282         .show_stats     = nfs_show_stats,
 283         .remount_fs     = nfs_remount,
 284 };
 285 #endif
 286
 287 static struct shrinker acl_shrinker = {
 288         .shrink         = nfs_access_cache_shrinker,
 289         .seeks          = DEFAULT_SEEKS,
 290 };
 291
 292 /*
 293  * Register the NFS filesystems
 294  */
 295 int __init register_nfs_fs(void)
 296 {
 297         int ret;
 298
 299         ret = register_filesystem(&nfs_fs_type);
 300         if (ret < 0)
 301                 goto error_0;
 302
 303         ret = nfs_register_sysctl();
 304         if (ret < 0)
 305                 goto error_1;
 306 #ifdef CONFIG_NFS_V4
 307         ret = register_filesystem(&nfs4_fs_type);
 308         if (ret < 0)
 309                 goto error_2;
 310 #endif
 311         register_shrinker(&acl_shrinker);
 312         return 0;
 313
 314 #ifdef CONFIG_NFS_V4
 315 error_2:
 316         nfs_unregister_sysctl();
 317 #endif
 318 error_1:
 319         unregister_filesystem(&nfs_fs_type);
 320 error_0:
 321         return ret;
 322 }
 323
 324 /*
 325  * Unregister the NFS filesystems
 326  */
 327 void __exit unregister_nfs_fs(void)
 328 {
 329         unregister_shrinker(&acl_shrinker);
 330 #ifdef CONFIG_NFS_V4
 331         unregister_filesystem(&nfs4_fs_type);
 332 #endif
 333         nfs_unregister_sysctl();
 334         unregister_filesystem(&nfs_fs_type);
 335 }
 336
 337 void nfs_sb_active(struct nfs_server *server)
 338 {
 339         atomic_inc(&server->active);
 340 }
 341
 342 void nfs_sb_deactive(struct nfs_server *server)
 343 {
 344         if (atomic_dec_and_test(&server->active))
 345                 wake_up(&server->active_wq);
 346 }
 347
 348 static void nfs_put_super(struct super_block *sb)
 349 {
 350         struct nfs_server *server = NFS_SB(sb);
 351         /*
 352          * Make sure there are no outstanding ops to this server.
 353          * If so, wait for them to finish before allowing the
 354          * unmount to continue.
 355          */
 356         wait_event(server->active_wq, atomic_read(&server->active) == 0);
 357 }
 358
 359 /*
 360  * Deliver file system statistics to userspace
 361  */
 362 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 363 {
 364         struct nfs_server *server = NFS_SB(dentry->d_sb);
 365         unsigned char blockbits;
 366         unsigned long blockres;
 367         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 368         struct nfs_fattr fattr;
 369         struct nfs_fsstat res = {
 370                         .fattr = &fattr,
 371         };
 372         int error;
 373
 374         lock_kernel();
 375
 376         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 377         if (error < 0)
 378                 goto out_err;
 379         buf->f_type = NFS_SUPER_MAGIC;
 380
 381         /*
 382          * Current versions of glibc do not correctly handle the
 383          * case where f_frsize != f_bsize.  Eventually we want to
 384          * report the value of wtmult in this field.
 385          */
 386         buf->f_frsize = dentry->d_sb->s_blocksize;
 387
 388         /*
 389          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 390          * are reported in units of f_frsize.  Linux hasn't had
 391          * an f_frsize field in its statfs struct until recently,
 392          * thus historically Linux's sys_statfs reports these
 393          * fields in units of f_bsize.
 394          */
 395         buf->f_bsize = dentry->d_sb->s_blocksize;
 396         blockbits = dentry->d_sb->s_blocksize_bits;
 397         blockres = (1 << blockbits) - 1;
 398         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 399         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 400         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 401
 402         buf->f_files = res.tfiles;
 403         buf->f_ffree = res.afiles;
 404
 405         buf->f_namelen = server->namelen;
 406
 407         unlock_kernel();
 408         return 0;
 409
 410  out_err:
 411         dprintk("%s: statfs error = %d\n", __func__, -error);
 412         unlock_kernel();
 413         return error;
 414 }
 415
 416 /*
 417  * Map the security flavour number to a name
 418  */
 419 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 420 {
 421         static const struct {
 422                 rpc_authflavor_t flavour;
 423                 const char *str;
 424         } sec_flavours[] = {
 425                 { RPC_AUTH_NULL, "null" },
 426                 { RPC_AUTH_UNIX, "sys" },
 427                 { RPC_AUTH_GSS_KRB5, "krb5" },
 428                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 429                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 430                 { RPC_AUTH_GSS_LKEY, "lkey" },
 431                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 432                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 433                 { RPC_AUTH_GSS_SPKM, "spkm" },
 434                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 435                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 436                 { UINT_MAX, "unknown" }
 437         };
 438         int i;
 439
 440         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 441                 if (sec_flavours[i].flavour == flavour)
 442                         break;
 443         }
 444         return sec_flavours[i].str;
 445 }
 446
 447 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 448                                     int showdefaults)
 449 {
 450         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
 451
 452         switch (sap->sa_family) {
 453         case AF_INET: {
 454                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 455                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
 456                                 NIPQUAD(sin->sin_addr.s_addr));
 457                 break;
 458         }
 459         case AF_INET6: {
 460                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 461                 seq_printf(m, ",mountaddr=" NIP6_FMT,
 462                                 NIP6(sin6->sin6_addr));
 463                 break;
 464         }
 465         default:
 466                 if (showdefaults)
 467                         seq_printf(m, ",mountaddr=unspecified");
 468         }
 469
 470         if (nfss->mountd_version || showdefaults)
 471                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
 472         if (nfss->mountd_port || showdefaults)
 473                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
 474
 475         switch (nfss->mountd_protocol) {
 476         case IPPROTO_UDP:
 477                 seq_printf(m, ",mountproto=udp");
 478                 break;
 479         case IPPROTO_TCP:
 480                 seq_printf(m, ",mountproto=tcp");
 481                 break;
 482         default:
 483                 if (showdefaults)
 484                         seq_printf(m, ",mountproto=auto");
 485         }
 486 }
 487
 488 /*
 489  * Describe the mount options in force on this server representation
 490  */
 491 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 492                                    int showdefaults)
 493 {
 494         static const struct proc_nfs_info {
 495                 int flag;
 496                 const char *str;
 497                 const char *nostr;
 498         } nfs_info[] = {
 499                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 500                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
 501                 { NFS_MOUNT_POSIX, ",posix", "" },
 502                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 503                 { NFS_MOUNT_NOAC, ",noac", "" },
 504                 { NFS_MOUNT_NONLM, ",nolock", "" },
 505                 { NFS_MOUNT_NOACL, ",noacl", "" },
 506                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 507                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
 508                 { 0, NULL, NULL }
 509         };
 510         const struct proc_nfs_info *nfs_infop;
 511         struct nfs_client *clp = nfss->nfs_client;
 512         u32 version = clp->rpc_ops->version;
 513
 514         seq_printf(m, ",vers=%u", version);
 515         seq_printf(m, ",rsize=%u", nfss->rsize);
 516         seq_printf(m, ",wsize=%u", nfss->wsize);
 517         if (nfss->bsize != 0)
 518                 seq_printf(m, ",bsize=%u", nfss->bsize);
 519         seq_printf(m, ",namlen=%u", nfss->namelen);
 520         if (nfss->acregmin != 3*HZ || showdefaults)
 521                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 522         if (nfss->acregmax != 60*HZ || showdefaults)
 523                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 524         if (nfss->acdirmin != 30*HZ || showdefaults)
 525                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 526         if (nfss->acdirmax != 60*HZ || showdefaults)
 527                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
 528         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 529                 if (nfss->flags & nfs_infop->flag)
 530                         seq_puts(m, nfs_infop->str);
 531                 else
 532                         seq_puts(m, nfs_infop->nostr);
 533         }
 534         seq_printf(m, ",proto=%s",
 535                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 536         if (version == 4) {
 537                 if (nfss->port != NFS_PORT)
 538                         seq_printf(m, ",port=%u", nfss->port);
 539         } else
 540                 if (nfss->port)
 541                         seq_printf(m, ",port=%u", nfss->port);
 542
 543         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 544         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 545         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 546
 547         if (version != 4)
 548                 nfs_show_mountd_options(m, nfss, showdefaults);
 549
 550 #ifdef CONFIG_NFS_V4
 551         if (clp->rpc_ops->version == 4)
 552                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
 553 #endif
 554 }
 555
 556 /*
 557  * Describe the mount options on this VFS mountpoint
 558  */
 559 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 560 {
 561         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 562
 563         nfs_show_mount_options(m, nfss, 0);
 564
 565         seq_printf(m, ",addr=%s",
 566                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 567                                                         RPC_DISPLAY_ADDR));
 568
 569         return 0;
 570 }
 571
 572 /*
 573  * Present statistical information for this VFS mountpoint
 574  */
 575 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 576 {
 577         int i, cpu;
 578         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 579         struct rpc_auth *auth = nfss->client->cl_auth;
 580         struct nfs_iostats totals = { };
 581
 582         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 583
 584         /*
 585          * Display all mount option settings
 586          */
 587         seq_printf(m, "\n\topts:\t");
 588         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 589         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 590         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 591         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 592         nfs_show_mount_options(m, nfss, 1);
 593
 594         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 595
 596         seq_printf(m, "\n\tcaps:\t");
 597         seq_printf(m, "caps=0x%x", nfss->caps);
 598         seq_printf(m, ",wtmult=%u", nfss->wtmult);
 599         seq_printf(m, ",dtsize=%u", nfss->dtsize);
 600         seq_printf(m, ",bsize=%u", nfss->bsize);
 601         seq_printf(m, ",namlen=%u", nfss->namelen);
 602
 603 #ifdef CONFIG_NFS_V4
 604         if (nfss->nfs_client->rpc_ops->version == 4) {
 605                 seq_printf(m, "\n\tnfsv4:\t");
 606                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 607                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 608                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 609         }
 610 #endif
 611
 612         /*
 613          * Display security flavor in effect for this mount
 614          */
 615         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
 616         if (auth->au_flavor)
 617                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
 618
 619         /*
 620          * Display superblock I/O counters
 621          */
 622         for_each_possible_cpu(cpu) {
 623                 struct nfs_iostats *stats;
 624
 625                 preempt_disable();
 626                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 627
 628                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 629                         totals.events[i] += stats->events[i];
 630                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 631                         totals.bytes[i] += stats->bytes[i];
 632
 633                 preempt_enable();
 634         }
 635
 636         seq_printf(m, "\n\tevents:\t");
 637         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 638                 seq_printf(m, "%lu ", totals.events[i]);
 639         seq_printf(m, "\n\tbytes:\t");
 640         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 641                 seq_printf(m, "%Lu ", totals.bytes[i]);
 642         seq_printf(m, "\n");
 643
 644         rpc_print_iostats(m, nfss->client);
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * Begin unmount by attempting to remove all automounted mountpoints we added
 651  * in response to xdev traversals and referrals
 652  */
 653 static void nfs_umount_begin(struct super_block *sb)
 654 {
 655         struct nfs_server *server = NFS_SB(sb);
 656         struct rpc_clnt *rpc;
 657
 658         /* -EIO all pending I/O */
 659         rpc = server->client_acl;
 660         if (!IS_ERR(rpc))
 661                 rpc_killall_tasks(rpc);
 662         rpc = server->client;
 663         if (!IS_ERR(rpc))
 664                 rpc_killall_tasks(rpc);
 665 }
 666
 667 /*
 668  * Set the port number in an address.  Be agnostic about the address family.
 669  */
 670 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 671 {
 672         switch (sap->sa_family) {
 673         case AF_INET: {
 674                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 675                 ap->sin_port = htons(port);
 676                 break;
 677         }
 678         case AF_INET6: {
 679                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 680                 ap->sin6_port = htons(port);
 681                 break;
 682         }
 683         }
 684 }
 685
 686 /*
 687  * Sanity-check a server address provided by the mount command.
 688  *
 689  * Address family must be initialized, and address must not be
 690  * the ANY address for that family.
 691  */
 692 static int nfs_verify_server_address(struct sockaddr *addr)
 693 {
 694         switch (addr->sa_family) {
 695         case AF_INET: {
 696                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 697                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
 698         }
 699         case AF_INET6: {
 700                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 701                 return !ipv6_addr_any(sa);
 702         }
 703         }
 704
 705         return 0;
 706 }
 707
 708 /*
 709  * Parse string addresses passed in via a mount option,
 710  * and construct a sockaddr based on the result.
 711  *
 712  * If address parsing fails, set the sockaddr's address
 713  * family to AF_UNSPEC to force nfs_verify_server_address()
 714  * to punt the mount.
 715  */
 716 static void nfs_parse_server_address(char *value,
 717                                      struct sockaddr *sap,
 718                                      size_t *len)
 719 {
 720         if (strchr(value, ':')) {
 721                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 722                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 723
 724                 ap->sin6_family = AF_INET6;
 725                 *len = sizeof(*ap);
 726                 if (in6_pton(value, -1, addr, '\0', NULL))
 727                         return;
 728         } else {
 729                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 730                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 731
 732                 ap->sin_family = AF_INET;
 733                 *len = sizeof(*ap);
 734                 if (in4_pton(value, -1, addr, '\0', NULL))
 735                         return;
 736         }
 737
 738         sap->sa_family = AF_UNSPEC;
 739         *len = 0;
 740 }
 741
 742 /*
 743  * Error-check and convert a string of mount options from user space into
 744  * a data structure
 745  */
 746 static int nfs_parse_mount_options(char *raw,
 747                                    struct nfs_parsed_mount_data *mnt)
 748 {
 749         char *p, *string, *secdata;
 750         int rc;
 751
 752         if (!raw) {
 753                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 754                 return 1;
 755         }
 756         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 757
 758         secdata = alloc_secdata();
 759         if (!secdata)
 760                 goto out_nomem;
 761
 762         rc = security_sb_copy_data(raw, secdata);
 763         if (rc)
 764                 goto out_security_failure;
 765
 766         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 767         if (rc)
 768                 goto out_security_failure;
 769
 770         free_secdata(secdata);
 771
 772         while ((p = strsep(&raw, ",")) != NULL) {
 773                 substring_t args[MAX_OPT_ARGS];
 774                 int option, token;
 775
 776                 if (!*p)
 777                         continue;
 778
 779                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 780
 781                 token = match_token(p, nfs_mount_option_tokens, args);
 782                 switch (token) {
 783                 case Opt_soft:
 784                         mnt->flags |= NFS_MOUNT_SOFT;
 785                         break;
 786                 case Opt_hard:
 787                         mnt->flags &= ~NFS_MOUNT_SOFT;
 788                         break;
 789                 case Opt_intr:
 790                 case Opt_nointr:
 791                         break;
 792                 case Opt_posix:
 793                         mnt->flags |= NFS_MOUNT_POSIX;
 794                         break;
 795                 case Opt_noposix:
 796                         mnt->flags &= ~NFS_MOUNT_POSIX;
 797                         break;
 798                 case Opt_cto:
 799                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 800                         break;
 801                 case Opt_nocto:
 802                         mnt->flags |= NFS_MOUNT_NOCTO;
 803                         break;
 804                 case Opt_ac:
 805                         mnt->flags &= ~NFS_MOUNT_NOAC;
 806                         break;
 807                 case Opt_noac:
 808                         mnt->flags |= NFS_MOUNT_NOAC;
 809                         break;
 810                 case Opt_lock:
 811                         mnt->flags &= ~NFS_MOUNT_NONLM;
 812                         break;
 813                 case Opt_nolock:
 814                         mnt->flags |= NFS_MOUNT_NONLM;
 815                         break;
 816                 case Opt_v2:
 817                         mnt->flags &= ~NFS_MOUNT_VER3;
 818                         break;
 819                 case Opt_v3:
 820                         mnt->flags |= NFS_MOUNT_VER3;
 821                         break;
 822                 case Opt_udp:
 823                         mnt->flags &= ~NFS_MOUNT_TCP;
 824                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 825                         mnt->timeo = 7;
 826                         mnt->retrans = 5;
 827                         break;
 828                 case Opt_tcp:
 829                         mnt->flags |= NFS_MOUNT_TCP;
 830                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 831                         mnt->timeo = 600;
 832                         mnt->retrans = 2;
 833                         break;
 834                 case Opt_rdma:
 835                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 836                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 837                         mnt->timeo = 600;
 838                         mnt->retrans = 2;
 839                         break;
 840                 case Opt_acl:
 841                         mnt->flags &= ~NFS_MOUNT_NOACL;
 842                         break;
 843                 case Opt_noacl:
 844                         mnt->flags |= NFS_MOUNT_NOACL;
 845                         break;
 846                 case Opt_rdirplus:
 847                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 848                         break;
 849                 case Opt_nordirplus:
 850                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 851                         break;
 852                 case Opt_sharecache:
 853                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 854                         break;
 855                 case Opt_nosharecache:
 856                         mnt->flags |= NFS_MOUNT_UNSHARED;
 857                         break;
 858
 859                 case Opt_port:
 860                         if (match_int(args, &option))
 861                                 return 0;
 862                         if (option < 0 || option > 65535)
 863                                 return 0;
 864                         mnt->nfs_server.port = option;
 865                         break;
 866                 case Opt_rsize:
 867                         if (match_int(args, &mnt->rsize))
 868                                 return 0;
 869                         break;
 870                 case Opt_wsize:
 871                         if (match_int(args, &mnt->wsize))
 872                                 return 0;
 873                         break;
 874                 case Opt_bsize:
 875                         if (match_int(args, &option))
 876                                 return 0;
 877                         if (option < 0)
 878                                 return 0;
 879                         mnt->bsize = option;
 880                         break;
 881                 case Opt_timeo:
 882                         if (match_int(args, &mnt->timeo))
 883                                 return 0;
 884                         break;
 885                 case Opt_retrans:
 886                         if (match_int(args, &mnt->retrans))
 887                                 return 0;
 888                         break;
 889                 case Opt_acregmin:
 890                         if (match_int(args, &mnt->acregmin))
 891                                 return 0;
 892                         break;
 893                 case Opt_acregmax:
 894                         if (match_int(args, &mnt->acregmax))
 895                                 return 0;
 896                         break;
 897                 case Opt_acdirmin:
 898                         if (match_int(args, &mnt->acdirmin))
 899                                 return 0;
 900                         break;
 901                 case Opt_acdirmax:
 902                         if (match_int(args, &mnt->acdirmax))
 903                                 return 0;
 904                         break;
 905                 case Opt_actimeo:
 906                         if (match_int(args, &option))
 907                                 return 0;
 908                         if (option < 0)
 909                                 return 0;
 910                         mnt->acregmin =
 911                         mnt->acregmax =
 912                         mnt->acdirmin =
 913                         mnt->acdirmax = option;
 914                         break;
 915                 case Opt_namelen:
 916                         if (match_int(args, &mnt->namlen))
 917                                 return 0;
 918                         break;
 919                 case Opt_mountport:
 920                         if (match_int(args, &option))
 921                                 return 0;
 922                         if (option < 0 || option > 65535)
 923                                 return 0;
 924                         mnt->mount_server.port = option;
 925                         break;
 926                 case Opt_mountvers:
 927                         if (match_int(args, &option))
 928                                 return 0;
 929                         if (option < 0)
 930                                 return 0;
 931                         mnt->mount_server.version = option;
 932                         break;
 933                 case Opt_nfsvers:
 934                         if (match_int(args, &option))
 935                                 return 0;
 936                         switch (option) {
 937                         case 2:
 938                                 mnt->flags &= ~NFS_MOUNT_VER3;
 939                                 break;
 940                         case 3:
 941                                 mnt->flags |= NFS_MOUNT_VER3;
 942                                 break;
 943                         default:
 944                                 goto out_unrec_vers;
 945                         }
 946                         break;
 947
 948                 case Opt_sec:
 949                         string = match_strdup(args);
 950                         if (string == NULL)
 951                                 goto out_nomem;
 952                         token = match_token(string, nfs_secflavor_tokens, args);
 953                         kfree(string);
 954
 955                         /*
 956                          * The flags setting is for v2/v3.  The flavor_len
 957                          * setting is for v4.  v2/v3 also need to know the
 958                          * difference between NULL and UNIX.
 959                          */
 960                         switch (token) {
 961                         case Opt_sec_none:
 962                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 963                                 mnt->auth_flavor_len = 0;
 964                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 965                                 break;
 966                         case Opt_sec_sys:
 967                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 968                                 mnt->auth_flavor_len = 0;
 969                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 970                                 break;
 971                         case Opt_sec_krb5:
 972                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 973                                 mnt->auth_flavor_len = 1;
 974                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 975                                 break;
 976                         case Opt_sec_krb5i:
 977                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 978                                 mnt->auth_flavor_len = 1;
 979                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 980                                 break;
 981                         case Opt_sec_krb5p:
 982                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 983                                 mnt->auth_flavor_len = 1;
 984                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 985                                 break;
 986                         case Opt_sec_lkey:
 987                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 988                                 mnt->auth_flavor_len = 1;
 989                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 990                                 break;
 991                         case Opt_sec_lkeyi:
 992                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 993                                 mnt->auth_flavor_len = 1;
 994                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 995                                 break;
 996                         case Opt_sec_lkeyp:
 997                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 998                                 mnt->auth_flavor_len = 1;
 999                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1000                                 break;
1001                         case Opt_sec_spkm:
1002                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1003                                 mnt->auth_flavor_len = 1;
1004                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1005                                 break;
1006                         case Opt_sec_spkmi:
1007                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1008                                 mnt->auth_flavor_len = 1;
1009                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1010                                 break;
1011                         case Opt_sec_spkmp:
1012                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1013                                 mnt->auth_flavor_len = 1;
1014                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1015                                 break;
1016                         default:
1017                                 goto out_unrec_sec;
1018                         }
1019                         break;
1020                 case Opt_proto:
1021                         string = match_strdup(args);
1022                         if (string == NULL)
1023                                 goto out_nomem;
1024                         token = match_token(string,
1025                                             nfs_xprt_protocol_tokens, args);
1026                         kfree(string);
1027
1028                         switch (token) {
1029                         case Opt_xprt_udp:
1030                                 mnt->flags &= ~NFS_MOUNT_TCP;
1031                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1032                                 mnt->timeo = 7;
1033                                 mnt->retrans = 5;
1034                                 break;
1035                         case Opt_xprt_tcp:
1036                                 mnt->flags |= NFS_MOUNT_TCP;
1037                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1038                                 mnt->timeo = 600;
1039                                 mnt->retrans = 2;
1040                                 break;
1041                         case Opt_xprt_rdma:
1042                                 /* vector side protocols to TCP */
1043                                 mnt->flags |= NFS_MOUNT_TCP;
1044                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1045                                 mnt->timeo = 600;
1046                                 mnt->retrans = 2;
1047                                 break;
1048                         default:
1049                                 goto out_unrec_xprt;
1050                         }
1051                         break;
1052                 case Opt_mountproto:
1053                         string = match_strdup(args);
1054                         if (string == NULL)
1055                                 goto out_nomem;
1056                         token = match_token(string,
1057                                             nfs_xprt_protocol_tokens, args);
1058                         kfree(string);
1059
1060                         switch (token) {
1061                         case Opt_xprt_udp:
1062                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1063                                 break;
1064                         case Opt_xprt_tcp:
1065                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1066                                 break;
1067                         case Opt_xprt_rdma: /* not used for side protocols */
1068                         default:
1069                                 goto out_unrec_xprt;
1070                         }
1071                         break;
1072                 case Opt_addr:
1073                         string = match_strdup(args);
1074                         if (string == NULL)
1075                                 goto out_nomem;
1076                         nfs_parse_server_address(string, (struct sockaddr *)
1077                                                  &mnt->nfs_server.address,
1078                                                  &mnt->nfs_server.addrlen);
1079                         kfree(string);
1080                         break;
1081                 case Opt_clientaddr:
1082                         string = match_strdup(args);
1083                         if (string == NULL)
1084                                 goto out_nomem;
1085                         kfree(mnt->client_address);
1086                         mnt->client_address = string;
1087                         break;
1088                 case Opt_mounthost:
1089                         string = match_strdup(args);
1090                         if (string == NULL)
1091                                 goto out_nomem;
1092                         kfree(mnt->mount_server.hostname);
1093                         mnt->mount_server.hostname = string;
1094                         break;
1095                 case Opt_mountaddr:
1096                         string = match_strdup(args);
1097                         if (string == NULL)
1098                                 goto out_nomem;
1099                         nfs_parse_server_address(string, (struct sockaddr *)
1100                                                  &mnt->mount_server.address,
1101                                                  &mnt->mount_server.addrlen);
1102                         kfree(string);
1103                         break;
1104
1105                 case Opt_userspace:
1106                 case Opt_deprecated:
1107                         break;
1108
1109                 default:
1110                         goto out_unknown;
1111                 }
1112         }
1113
1114         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1115                                 mnt->nfs_server.port);
1116
1117         return 1;
1118
1119 out_nomem:
1120         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1121         return 0;
1122 out_security_failure:
1123         free_secdata(secdata);
1124         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1125         return 0;
1126 out_unrec_vers:
1127         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1128         return 0;
1129
1130 out_unrec_xprt:
1131         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1132         return 0;
1133
1134 out_unrec_sec:
1135         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1136         return 0;
1137
1138 out_unknown:
1139         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1140         return 0;
1141 }
1142
1143 /*
1144  * Use the remote server's MOUNT service to request the NFS file handle
1145  * corresponding to the provided path.
1146  */
1147 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1148                          struct nfs_fh *root_fh)
1149 {
1150         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1151         char *hostname;
1152         int status;
1153
1154         if (args->mount_server.version == 0) {
1155                 if (args->flags & NFS_MOUNT_VER3)
1156                         args->mount_server.version = NFS_MNT3_VERSION;
1157                 else
1158                         args->mount_server.version = NFS_MNT_VERSION;
1159         }
1160
1161         if (args->mount_server.hostname)
1162                 hostname = args->mount_server.hostname;
1163         else
1164                 hostname = args->nfs_server.hostname;
1165
1166         /*
1167          * Construct the mount server's address.
1168          */
1169         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1170                 memcpy(sap, &args->nfs_server.address,
1171                        args->nfs_server.addrlen);
1172                 args->mount_server.addrlen = args->nfs_server.addrlen;
1173         }
1174
1175         /*
1176          * autobind will be used if mount_server.port == 0
1177          */
1178         nfs_set_port(sap, args->mount_server.port);
1179
1180         /*
1181          * Now ask the mount server to map our export path
1182          * to a file handle.
1183          */
1184         status = nfs_mount(sap,
1185                            args->mount_server.addrlen,
1186                            hostname,
1187                            args->nfs_server.export_path,
1188                            args->mount_server.version,
1189                            args->mount_server.protocol,
1190                            root_fh);
1191         if (status == 0)
1192                 return 0;
1193
1194         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1195                         hostname, status);
1196         return status;
1197 }
1198
1199 /*
1200  * Validate the NFS2/NFS3 mount data
1201  * - fills in the mount root filehandle
1202  *
1203  * For option strings, user space handles the following behaviors:
1204  *
1205  * + DNS: mapping server host name to IP address ("addr=" option)
1206  *
1207  * + failure mode: how to behave if a mount request can't be handled
1208  *   immediately ("fg/bg" option)
1209  *
1210  * + retry: how often to retry a mount request ("retry=" option)
1211  *
1212  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1213  *   mountproto=tcp after mountproto=udp, and so on
1214  */
1215 static int nfs_validate_mount_data(void *options,
1216                                    struct nfs_parsed_mount_data *args,
1217                                    struct nfs_fh *mntfh,
1218                                    const char *dev_name)
1219 {
1220         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1221
1222         if (data == NULL)
1223                 goto out_no_data;
1224
1225         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1226         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1227         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1228         args->timeo             = 600;
1229         args->retrans           = 2;
1230         args->acregmin          = 3;
1231         args->acregmax          = 60;
1232         args->acdirmin          = 30;
1233         args->acdirmax          = 60;
1234         args->mount_server.port = 0;    /* autobind unless user sets port */
1235         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1236         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1237         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1238
1239         switch (data->version) {
1240         case 1:
1241                 data->namlen = 0;
1242         case 2:
1243                 data->bsize = 0;
1244         case 3:
1245                 if (data->flags & NFS_MOUNT_VER3)
1246                         goto out_no_v3;
1247                 data->root.size = NFS2_FHSIZE;
1248                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1249         case 4:
1250                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1251                         goto out_no_sec;
1252         case 5:
1253                 memset(data->context, 0, sizeof(data->context));
1254         case 6:
1255                 if (data->flags & NFS_MOUNT_VER3) {
1256                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1257                                 goto out_invalid_fh;
1258                         mntfh->size = data->root.size;
1259                 } else
1260                         mntfh->size = NFS2_FHSIZE;
1261
1262
1263                 memcpy(mntfh->data, data->root.data, mntfh->size);
1264                 if (mntfh->size < sizeof(mntfh->data))
1265                         memset(mntfh->data + mntfh->size, 0,
1266                                sizeof(mntfh->data) - mntfh->size);
1267
1268                 /*
1269                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1270                  * can deal with.
1271                  */
1272                 args->flags             = data->flags;
1273                 args->rsize             = data->rsize;
1274                 args->wsize             = data->wsize;
1275                 args->timeo             = data->timeo;
1276                 args->retrans           = data->retrans;
1277                 args->acregmin          = data->acregmin;
1278                 args->acregmax          = data->acregmax;
1279                 args->acdirmin          = data->acdirmin;
1280                 args->acdirmax          = data->acdirmax;
1281
1282                 memcpy(&args->nfs_server.address, &data->addr,
1283                        sizeof(data->addr));
1284                 args->nfs_server.addrlen = sizeof(data->addr);
1285                 if (!nfs_verify_server_address((struct sockaddr *)
1286                                                 &args->nfs_server.address))
1287                         goto out_no_address;
1288
1289                 if (!(data->flags & NFS_MOUNT_TCP))
1290                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1291                 /* N.B. caller will free nfs_server.hostname in all cases */
1292                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1293                 args->namlen            = data->namlen;
1294                 args->bsize             = data->bsize;
1295                 args->auth_flavors[0]   = data->pseudoflavor;
1296                 if (!args->nfs_server.hostname)
1297                         goto out_nomem;
1298
1299                 /*
1300                  * The legacy version 6 binary mount data from userspace has a
1301                  * field used only to transport selinux information into the
1302                  * the kernel.  To continue to support that functionality we
1303                  * have a touch of selinux knowledge here in the NFS code. The
1304                  * userspace code converted context=blah to just blah so we are
1305                  * converting back to the full string selinux understands.
1306                  */
1307                 if (data->context[0]){
1308 #ifdef CONFIG_SECURITY_SELINUX
1309                         int rc;
1310                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1311                         if (!opts_str)
1312                                 return -ENOMEM;
1313                         strcpy(opts_str, "context=");
1314                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1315                         strcat(opts_str, &data->context[0]);
1316                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1317                         kfree(opts_str);
1318                         if (rc)
1319                                 return rc;
1320 #else
1321                         return -EINVAL;
1322 #endif
1323                 }
1324
1325                 break;
1326         default: {
1327                 unsigned int len;
1328                 char *c;
1329                 int status;
1330
1331                 if (nfs_parse_mount_options((char *)options, args) == 0)
1332                         return -EINVAL;
1333
1334                 if (!nfs_verify_server_address((struct sockaddr *)
1335                                                 &args->nfs_server.address))
1336                         goto out_no_address;
1337
1338                 c = strchr(dev_name, ':');
1339                 if (c == NULL)
1340                         return -EINVAL;
1341                 len = c - dev_name;
1342                 /* N.B. caller will free nfs_server.hostname in all cases */
1343                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1344                 if (!args->nfs_server.hostname)
1345                         goto out_nomem;
1346
1347                 c++;
1348                 if (strlen(c) > NFS_MAXPATHLEN)
1349                         return -ENAMETOOLONG;
1350                 args->nfs_server.export_path = c;
1351
1352                 status = nfs_try_mount(args, mntfh);
1353                 if (status)
1354                         return status;
1355
1356                 break;
1357                 }
1358         }
1359
1360         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1361                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1362
1363 #ifndef CONFIG_NFS_V3
1364         if (args->flags & NFS_MOUNT_VER3)
1365                 goto out_v3_not_compiled;
1366 #endif /* !CONFIG_NFS_V3 */
1367
1368         return 0;
1369
1370 out_no_data:
1371         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1372         return -EINVAL;
1373
1374 out_no_v3:
1375         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1376                  data->version);
1377         return -EINVAL;
1378
1379 out_no_sec:
1380         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1381         return -EINVAL;
1382
1383 #ifndef CONFIG_NFS_V3
1384 out_v3_not_compiled:
1385         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1386         return -EPROTONOSUPPORT;
1387 #endif /* !CONFIG_NFS_V3 */
1388
1389 out_nomem:
1390         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1391         return -ENOMEM;
1392
1393 out_no_address:
1394         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1395         return -EINVAL;
1396
1397 out_invalid_fh:
1398         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1399         return -EINVAL;
1400 }
1401
1402 static int
1403 nfs_compare_remount_data(struct nfs_server *nfss,
1404                          struct nfs_parsed_mount_data *data)
1405 {
1406         if (data->flags != nfss->flags ||
1407             data->rsize != nfss->rsize ||
1408             data->wsize != nfss->wsize ||
1409             data->retrans != nfss->client->cl_timeout->to_retries ||
1410             data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1411             data->acregmin != nfss->acregmin / HZ ||
1412             data->acregmax != nfss->acregmax / HZ ||
1413             data->acdirmin != nfss->acdirmin / HZ ||
1414             data->acdirmax != nfss->acdirmax / HZ ||
1415             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1416             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1417             memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1418                    data->nfs_server.addrlen) != 0)
1419                 return -EINVAL;
1420
1421         return 0;
1422 }
1423
1424 static int
1425 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1426 {
1427         int error;
1428         struct nfs_server *nfss = sb->s_fs_info;
1429         struct nfs_parsed_mount_data *data;
1430         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1431         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1432
1433         /*
1434          * Userspace mount programs that send binary options generally send
1435          * them populated with default values. We have no way to know which
1436          * ones were explicitly specified. Fall back to legacy behavior and
1437          * just return success.
1438          */
1439         if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1440             (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1441              options->version <= 6))
1442                 return 0;
1443
1444         data = kzalloc(sizeof(*data), GFP_KERNEL);
1445         if (data == NULL)
1446                 return -ENOMEM;
1447
1448         /* fill out struct with values from existing mount */
1449         data->flags = nfss->flags;
1450         data->rsize = nfss->rsize;
1451         data->wsize = nfss->wsize;
1452         data->retrans = nfss->client->cl_timeout->to_retries;
1453         data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1454         data->acregmin = nfss->acregmin / HZ;
1455         data->acregmax = nfss->acregmax / HZ;
1456         data->acdirmin = nfss->acdirmin / HZ;
1457         data->acdirmax = nfss->acdirmax / HZ;
1458         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1459         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1460         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1461                 data->nfs_server.addrlen);
1462
1463         /* overwrite those values with any that were specified */
1464         error = nfs_parse_mount_options((char *)options, data);
1465         if (error < 0)
1466                 goto out;
1467
1468         /* compare new mount options with old ones */
1469         error = nfs_compare_remount_data(nfss, data);
1470 out:
1471         kfree(data);
1472         return error;
1473 }
1474
1475 /*
1476  * Initialise the common bits of the superblock
1477  */
1478 static inline void nfs_initialise_sb(struct super_block *sb)
1479 {
1480         struct nfs_server *server = NFS_SB(sb);
1481
1482         sb->s_magic = NFS_SUPER_MAGIC;
1483
1484         /* We probably want something more informative here */
1485         snprintf(sb->s_id, sizeof(sb->s_id),
1486                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1487
1488         if (sb->s_blocksize == 0)
1489                 sb->s_blocksize = nfs_block_bits(server->wsize,
1490                                                  &sb->s_blocksize_bits);
1491
1492         if (server->flags & NFS_MOUNT_NOAC)
1493                 sb->s_flags |= MS_SYNCHRONOUS;
1494
1495         nfs_super_set_maxbytes(sb, server->maxfilesize);
1496 }
1497
1498 /*
1499  * Finish setting up an NFS2/3 superblock
1500  */
1501 static void nfs_fill_super(struct super_block *sb,
1502                            struct nfs_parsed_mount_data *data)
1503 {
1504         struct nfs_server *server = NFS_SB(sb);
1505
1506         sb->s_blocksize_bits = 0;
1507         sb->s_blocksize = 0;
1508         if (data->bsize)
1509                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1510
1511         if (server->flags & NFS_MOUNT_VER3) {
1512                 /* The VFS shouldn't apply the umask to mode bits. We will do
1513                  * so ourselves when necessary.
1514                  */
1515                 sb->s_flags |= MS_POSIXACL;
1516                 sb->s_time_gran = 1;
1517         }
1518
1519         sb->s_op = &nfs_sops;
1520         nfs_initialise_sb(sb);
1521 }
1522
1523 /*
1524  * Finish setting up a cloned NFS2/3 superblock
1525  */
1526 static void nfs_clone_super(struct super_block *sb,
1527                             const struct super_block *old_sb)
1528 {
1529         struct nfs_server *server = NFS_SB(sb);
1530
1531         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1532         sb->s_blocksize = old_sb->s_blocksize;
1533         sb->s_maxbytes = old_sb->s_maxbytes;
1534
1535         if (server->flags & NFS_MOUNT_VER3) {
1536                 /* The VFS shouldn't apply the umask to mode bits. We will do
1537                  * so ourselves when necessary.
1538                  */
1539                 sb->s_flags |= MS_POSIXACL;
1540                 sb->s_time_gran = 1;
1541         }
1542
1543         sb->s_op = old_sb->s_op;
1544         nfs_initialise_sb(sb);
1545 }
1546
1547 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1548
1549 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1550 {
1551         const struct nfs_server *a = s->s_fs_info;
1552         const struct rpc_clnt *clnt_a = a->client;
1553         const struct rpc_clnt *clnt_b = b->client;
1554
1555         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1556                 goto Ebusy;
1557         if (a->nfs_client != b->nfs_client)
1558                 goto Ebusy;
1559         if (a->flags != b->flags)
1560                 goto Ebusy;
1561         if (a->wsize != b->wsize)
1562                 goto Ebusy;
1563         if (a->rsize != b->rsize)
1564                 goto Ebusy;
1565         if (a->acregmin != b->acregmin)
1566                 goto Ebusy;
1567         if (a->acregmax != b->acregmax)
1568                 goto Ebusy;
1569         if (a->acdirmin != b->acdirmin)
1570                 goto Ebusy;
1571         if (a->acdirmax != b->acdirmax)
1572                 goto Ebusy;
1573         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1574                 goto Ebusy;
1575         return 1;
1576 Ebusy:
1577         return 0;
1578 }
1579
1580 struct nfs_sb_mountdata {
1581         struct nfs_server *server;
1582         int mntflags;
1583 };
1584
1585 static int nfs_set_super(struct super_block *s, void *data)
1586 {
1587         struct nfs_sb_mountdata *sb_mntdata = data;
1588         struct nfs_server *server = sb_mntdata->server;
1589         int ret;
1590
1591         s->s_flags = sb_mntdata->mntflags;
1592         s->s_fs_info = server;
1593         ret = set_anon_super(s, server);
1594         if (ret == 0)
1595                 server->s_dev = s->s_dev;
1596         return ret;
1597 }
1598
1599 static int nfs_compare_super_address(struct nfs_server *server1,
1600                                      struct nfs_server *server2)
1601 {
1602         struct sockaddr *sap1, *sap2;
1603
1604         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1605         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1606
1607         if (sap1->sa_family != sap2->sa_family)
1608                 return 0;
1609
1610         switch (sap1->sa_family) {
1611         case AF_INET: {
1612                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1613                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1614                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1615                         return 0;
1616                 if (sin1->sin_port != sin2->sin_port)
1617                         return 0;
1618                 break;
1619         }
1620         case AF_INET6: {
1621                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1622                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1623                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1624                         return 0;
1625                 if (sin1->sin6_port != sin2->sin6_port)
1626                         return 0;
1627                 break;
1628         }
1629         default:
1630                 return 0;
1631         }
1632
1633         return 1;
1634 }
1635
1636 static int nfs_compare_super(struct super_block *sb, void *data)
1637 {
1638         struct nfs_sb_mountdata *sb_mntdata = data;
1639         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1640         int mntflags = sb_mntdata->mntflags;
1641
1642         if (!nfs_compare_super_address(old, server))
1643                 return 0;
1644         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1645         if (old->flags & NFS_MOUNT_UNSHARED)
1646                 return 0;
1647         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1648                 return 0;
1649         return nfs_compare_mount_options(sb, server, mntflags);
1650 }
1651
1652 static int nfs_bdi_register(struct nfs_server *server)
1653 {
1654         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1655 }
1656
1657 static int nfs_get_sb(struct file_system_type *fs_type,
1658         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1659 {
1660         struct nfs_server *server = NULL;
1661         struct super_block *s;
1662         struct nfs_parsed_mount_data *data;
1663         struct nfs_fh *mntfh;
1664         struct dentry *mntroot;
1665         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1666         struct nfs_sb_mountdata sb_mntdata = {
1667                 .mntflags = flags,
1668         };
1669         int error = -ENOMEM;
1670
1671         data = kzalloc(sizeof(*data), GFP_KERNEL);
1672         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1673         if (data == NULL || mntfh == NULL)
1674                 goto out_free_fh;
1675
1676         security_init_mnt_opts(&data->lsm_opts);
1677
1678         /* Validate the mount data */
1679         error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1680         if (error < 0)
1681                 goto out;
1682
1683         /* Get a volume representation */
1684         server = nfs_create_server(data, mntfh);
1685         if (IS_ERR(server)) {
1686                 error = PTR_ERR(server);
1687                 goto out;
1688         }
1689         sb_mntdata.server = server;
1690
1691         if (server->flags & NFS_MOUNT_UNSHARED)
1692                 compare_super = NULL;
1693
1694         /* Get a superblock - note that we may end up sharing one that already exists */
1695         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1696         if (IS_ERR(s)) {
1697                 error = PTR_ERR(s);
1698                 goto out_err_nosb;
1699         }
1700
1701         if (s->s_fs_info != server) {
1702                 nfs_free_server(server);
1703                 server = NULL;
1704         } else {
1705                 error = nfs_bdi_register(server);
1706                 if (error)
1707                         goto error_splat_super;
1708         }
1709
1710         if (!s->s_root) {
1711                 /* initial superblock/root creation */
1712                 nfs_fill_super(s, data);
1713         }
1714
1715         mntroot = nfs_get_root(s, mntfh);
1716         if (IS_ERR(mntroot)) {
1717                 error = PTR_ERR(mntroot);
1718                 goto error_splat_super;
1719         }
1720
1721         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1722         if (error)
1723                 goto error_splat_root;
1724
1725         s->s_flags |= MS_ACTIVE;
1726         mnt->mnt_sb = s;
1727         mnt->mnt_root = mntroot;
1728         error = 0;
1729
1730 out:
1731         kfree(data->nfs_server.hostname);
1732         kfree(data->mount_server.hostname);
1733         security_free_mnt_opts(&data->lsm_opts);
1734 out_free_fh:
1735         kfree(mntfh);
1736         kfree(data);
1737         return error;
1738
1739 out_err_nosb:
1740         nfs_free_server(server);
1741         goto out;
1742
1743 error_splat_root:
1744         dput(mntroot);
1745 error_splat_super:
1746         up_write(&s->s_umount);
1747         deactivate_super(s);
1748         goto out;
1749 }
1750
1751 /*
1752  * Destroy an NFS2/3 superblock
1753  */
1754 static void nfs_kill_super(struct super_block *s)
1755 {
1756         struct nfs_server *server = NFS_SB(s);
1757
1758         bdi_unregister(&server->backing_dev_info);
1759         kill_anon_super(s);
1760         nfs_free_server(server);
1761 }
1762
1763 /*
1764  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1765  */
1766 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1767                            const char *dev_name, void *raw_data,
1768                            struct vfsmount *mnt)
1769 {
1770         struct nfs_clone_mount *data = raw_data;
1771         struct super_block *s;
1772         struct nfs_server *server;
1773         struct dentry *mntroot;
1774         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1775         struct nfs_sb_mountdata sb_mntdata = {
1776                 .mntflags = flags,
1777         };
1778         int error;
1779
1780         dprintk("--> nfs_xdev_get_sb()\n");
1781
1782         /* create a new volume representation */
1783         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1784         if (IS_ERR(server)) {
1785                 error = PTR_ERR(server);
1786                 goto out_err_noserver;
1787         }
1788         sb_mntdata.server = server;
1789
1790         if (server->flags & NFS_MOUNT_UNSHARED)
1791                 compare_super = NULL;
1792
1793         /* Get a superblock - note that we may end up sharing one that already exists */
1794         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1795         if (IS_ERR(s)) {
1796                 error = PTR_ERR(s);
1797                 goto out_err_nosb;
1798         }
1799
1800         if (s->s_fs_info != server) {
1801                 nfs_free_server(server);
1802                 server = NULL;
1803         } else {
1804                 error = nfs_bdi_register(server);
1805                 if (error)
1806                         goto error_splat_super;
1807         }
1808
1809         if (!s->s_root) {
1810                 /* initial superblock/root creation */
1811                 nfs_clone_super(s, data->sb);
1812         }
1813
1814         mntroot = nfs_get_root(s, data->fh);
1815         if (IS_ERR(mntroot)) {
1816                 error = PTR_ERR(mntroot);
1817                 goto error_splat_super;
1818         }
1819         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1820                 dput(mntroot);
1821                 error = -ESTALE;
1822                 goto error_splat_super;
1823         }
1824
1825         s->s_flags |= MS_ACTIVE;
1826         mnt->mnt_sb = s;
1827         mnt->mnt_root = mntroot;
1828
1829         /* clone any lsm security options from the parent to the new sb */
1830         security_sb_clone_mnt_opts(data->sb, s);
1831
1832         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1833         return 0;
1834
1835 out_err_nosb:
1836         nfs_free_server(server);
1837 out_err_noserver:
1838         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1839         return error;
1840
1841 error_splat_super:
1842         up_write(&s->s_umount);
1843         deactivate_super(s);
1844         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1845         return error;
1846 }
1847
1848 #ifdef CONFIG_NFS_V4
1849
1850 /*
1851  * Finish setting up a cloned NFS4 superblock
1852  */
1853 static void nfs4_clone_super(struct super_block *sb,
1854                             const struct super_block *old_sb)
1855 {
1856         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1857         sb->s_blocksize = old_sb->s_blocksize;
1858         sb->s_maxbytes = old_sb->s_maxbytes;
1859         sb->s_time_gran = 1;
1860         sb->s_op = old_sb->s_op;
1861         nfs_initialise_sb(sb);
1862 }
1863
1864 /*
1865  * Set up an NFS4 superblock
1866  */
1867 static void nfs4_fill_super(struct super_block *sb)
1868 {
1869         sb->s_time_gran = 1;
1870         sb->s_op = &nfs4_sops;
1871         nfs_initialise_sb(sb);
1872 }
1873
1874 /*
1875  * Validate NFSv4 mount options
1876  */
1877 static int nfs4_validate_mount_data(void *options,
1878                                     struct nfs_parsed_mount_data *args,
1879                                     const char *dev_name)
1880 {
1881         struct sockaddr_in *ap;
1882         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1883         char *c;
1884
1885         if (data == NULL)
1886                 goto out_no_data;
1887
1888         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1889         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1890         args->timeo             = 600;
1891         args->retrans           = 2;
1892         args->acregmin          = 3;
1893         args->acregmax          = 60;
1894         args->acdirmin          = 30;
1895         args->acdirmax          = 60;
1896         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1897         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1898
1899         switch (data->version) {
1900         case 1:
1901                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1902                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1903                         goto out_no_address;
1904                 if (data->host_addrlen == 0)
1905                         goto out_no_address;
1906                 args->nfs_server.addrlen = data->host_addrlen;
1907                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1908                         return -EFAULT;
1909                 if (!nfs_verify_server_address((struct sockaddr *)
1910                                                 &args->nfs_server.address))
1911                         goto out_no_address;
1912
1913                 switch (data->auth_flavourlen) {
1914                 case 0:
1915                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1916                         break;
1917                 case 1:
1918                         if (copy_from_user(&args->auth_flavors[0],
1919                                            data->auth_flavours,
1920                                            sizeof(args->auth_flavors[0])))
1921                                 return -EFAULT;
1922                         break;
1923                 default:
1924                         goto out_inval_auth;
1925                 }
1926
1927                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1928                 if (IS_ERR(c))
1929                         return PTR_ERR(c);
1930                 args->nfs_server.hostname = c;
1931
1932                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1933                 if (IS_ERR(c))
1934                         return PTR_ERR(c);
1935                 args->nfs_server.export_path = c;
1936                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1937
1938                 c = strndup_user(data->client_addr.data, 16);
1939                 if (IS_ERR(c))
1940                         return PTR_ERR(c);
1941                 args->client_address = c;
1942
1943                 /*
1944                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1945                  * can deal with.
1946                  */
1947
1948                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1949                 args->rsize     = data->rsize;
1950                 args->wsize     = data->wsize;
1951                 args->timeo     = data->timeo;
1952                 args->retrans   = data->retrans;
1953                 args->acregmin  = data->acregmin;
1954                 args->acregmax  = data->acregmax;
1955                 args->acdirmin  = data->acdirmin;
1956                 args->acdirmax  = data->acdirmax;
1957                 args->nfs_server.protocol = data->proto;
1958
1959                 break;
1960         default: {
1961                 unsigned int len;
1962
1963                 if (nfs_parse_mount_options((char *)options, args) == 0)
1964                         return -EINVAL;
1965
1966                 if (!nfs_verify_server_address((struct sockaddr *)
1967                                                 &args->nfs_server.address))
1968                         return -EINVAL;
1969
1970                 switch (args->auth_flavor_len) {
1971                 case 0:
1972                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1973                         break;
1974                 case 1:
1975                         break;
1976                 default:
1977                         goto out_inval_auth;
1978                 }
1979
1980                 /*
1981                  * Split "dev_name" into "hostname:mntpath".
1982                  */
1983                 c = strchr(dev_name, ':');
1984                 if (c == NULL)
1985                         return -EINVAL;
1986                 /* while calculating len, pretend ':' is '\0' */
1987                 len = c - dev_name;
1988                 if (len > NFS4_MAXNAMLEN)
1989                         return -ENAMETOOLONG;
1990                 /* N.B. caller will free nfs_server.hostname in all cases */
1991                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1992                 if (!args->nfs_server.hostname)
1993                         goto out_nomem;
1994
1995                 c++;                    /* step over the ':' */
1996                 len = strlen(c);
1997                 if (len > NFS4_MAXPATHLEN)
1998                         return -ENAMETOOLONG;
1999                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
2000                 if (!args->nfs_server.export_path)
2001                         goto out_nomem;
2002
2003                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2004
2005                 if (args->client_address == NULL)
2006                         goto out_no_client_address;
2007
2008                 break;
2009                 }
2010         }
2011
2012         return 0;
2013
2014 out_no_data:
2015         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2016         return -EINVAL;
2017
2018 out_inval_auth:
2019         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2020                  data->auth_flavourlen);
2021         return -EINVAL;
2022
2023 out_nomem:
2024         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2025         return -ENOMEM;
2026
2027 out_no_address:
2028         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2029         return -EINVAL;
2030
2031 out_no_client_address:
2032         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2033         return -EINVAL;
2034 }
2035
2036 /*
2037  * Get the superblock for an NFS4 mountpoint
2038  */
2039 static int nfs4_get_sb(struct file_system_type *fs_type,
2040         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2041 {
2042         struct nfs_parsed_mount_data *data;
2043         struct super_block *s;
2044         struct nfs_server *server;
2045         struct nfs_fh *mntfh;
2046         struct dentry *mntroot;
2047         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2048         struct nfs_sb_mountdata sb_mntdata = {
2049                 .mntflags = flags,
2050         };
2051         int error = -ENOMEM;
2052
2053         data = kzalloc(sizeof(*data), GFP_KERNEL);
2054         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2055         if (data == NULL || mntfh == NULL)
2056                 goto out_free_fh;
2057
2058         security_init_mnt_opts(&data->lsm_opts);
2059
2060         /* Validate the mount data */
2061         error = nfs4_validate_mount_data(raw_data, data, dev_name);
2062         if (error < 0)
2063                 goto out;
2064
2065         /* Get a volume representation */
2066         server = nfs4_create_server(data, mntfh);
2067         if (IS_ERR(server)) {
2068                 error = PTR_ERR(server);
2069                 goto out;
2070         }
2071         sb_mntdata.server = server;
2072
2073         if (server->flags & NFS4_MOUNT_UNSHARED)
2074                 compare_super = NULL;
2075
2076         /* Get a superblock - note that we may end up sharing one that already exists */
2077         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2078         if (IS_ERR(s)) {
2079                 error = PTR_ERR(s);
2080                 goto out_free;
2081         }
2082
2083         if (s->s_fs_info != server) {
2084                 nfs_free_server(server);
2085                 server = NULL;
2086         } else {
2087                 error = nfs_bdi_register(server);
2088                 if (error)
2089                         goto error_splat_super;
2090         }
2091
2092         if (!s->s_root) {
2093                 /* initial superblock/root creation */
2094                 nfs4_fill_super(s);
2095         }
2096
2097         mntroot = nfs4_get_root(s, mntfh);
2098         if (IS_ERR(mntroot)) {
2099                 error = PTR_ERR(mntroot);
2100                 goto error_splat_super;
2101         }
2102
2103         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2104         if (error)
2105                 goto error_splat_root;
2106
2107         s->s_flags |= MS_ACTIVE;
2108         mnt->mnt_sb = s;
2109         mnt->mnt_root = mntroot;
2110         error = 0;
2111
2112 out:
2113         kfree(data->client_address);
2114         kfree(data->nfs_server.export_path);
2115         kfree(data->nfs_server.hostname);
2116         security_free_mnt_opts(&data->lsm_opts);
2117 out_free_fh:
2118         kfree(mntfh);
2119         kfree(data);
2120         return error;
2121
2122 out_free:
2123         nfs_free_server(server);
2124         goto out;
2125
2126 error_splat_root:
2127         dput(mntroot);
2128 error_splat_super:
2129         up_write(&s->s_umount);
2130         deactivate_super(s);
2131         goto out;
2132 }
2133
2134 static void nfs4_kill_super(struct super_block *sb)
2135 {
2136         struct nfs_server *server = NFS_SB(sb);
2137
2138         nfs_return_all_delegations(sb);
2139         kill_anon_super(sb);
2140
2141         nfs4_renewd_prepare_shutdown(server);
2142         nfs_free_server(server);
2143 }
2144
2145 /*
2146  * Clone an NFS4 server record on xdev traversal (FSID-change)
2147  */
2148 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2149                             const char *dev_name, void *raw_data,
2150                             struct vfsmount *mnt)
2151 {
2152         struct nfs_clone_mount *data = raw_data;
2153         struct super_block *s;
2154         struct nfs_server *server;
2155         struct dentry *mntroot;
2156         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2157         struct nfs_sb_mountdata sb_mntdata = {
2158                 .mntflags = flags,
2159         };
2160         int error;
2161
2162         dprintk("--> nfs4_xdev_get_sb()\n");
2163
2164         /* create a new volume representation */
2165         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2166         if (IS_ERR(server)) {
2167                 error = PTR_ERR(server);
2168                 goto out_err_noserver;
2169         }
2170         sb_mntdata.server = server;
2171
2172         if (server->flags & NFS4_MOUNT_UNSHARED)
2173                 compare_super = NULL;
2174
2175         /* Get a superblock - note that we may end up sharing one that already exists */
2176         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2177         if (IS_ERR(s)) {
2178                 error = PTR_ERR(s);
2179                 goto out_err_nosb;
2180         }
2181
2182         if (s->s_fs_info != server) {
2183                 nfs_free_server(server);
2184                 server = NULL;
2185         } else {
2186                 error = nfs_bdi_register(server);
2187                 if (error)
2188                         goto error_splat_super;
2189         }
2190
2191         if (!s->s_root) {
2192                 /* initial superblock/root creation */
2193                 nfs4_clone_super(s, data->sb);
2194         }
2195
2196         mntroot = nfs4_get_root(s, data->fh);
2197         if (IS_ERR(mntroot)) {
2198                 error = PTR_ERR(mntroot);
2199                 goto error_splat_super;
2200         }
2201         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2202                 dput(mntroot);
2203                 error = -ESTALE;
2204                 goto error_splat_super;
2205         }
2206
2207         s->s_flags |= MS_ACTIVE;
2208         mnt->mnt_sb = s;
2209         mnt->mnt_root = mntroot;
2210
2211         security_sb_clone_mnt_opts(data->sb, s);
2212
2213         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2214         return 0;
2215
2216 out_err_nosb:
2217         nfs_free_server(server);
2218 out_err_noserver:
2219         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2220         return error;
2221
2222 error_splat_super:
2223         up_write(&s->s_umount);
2224         deactivate_super(s);
2225         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2226         return error;
2227 }
2228
2229 /*
2230  * Create an NFS4 server record on referral traversal
2231  */
2232 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2233                                 const char *dev_name, void *raw_data,
2234                                 struct vfsmount *mnt)
2235 {
2236         struct nfs_clone_mount *data = raw_data;
2237         struct super_block *s;
2238         struct nfs_server *server;
2239         struct dentry *mntroot;
2240         struct nfs_fh mntfh;
2241         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2242         struct nfs_sb_mountdata sb_mntdata = {
2243                 .mntflags = flags,
2244         };
2245         int error;
2246
2247         dprintk("--> nfs4_referral_get_sb()\n");
2248
2249         /* create a new volume representation */
2250         server = nfs4_create_referral_server(data, &mntfh);
2251         if (IS_ERR(server)) {
2252                 error = PTR_ERR(server);
2253                 goto out_err_noserver;
2254         }
2255         sb_mntdata.server = server;
2256
2257         if (server->flags & NFS4_MOUNT_UNSHARED)
2258                 compare_super = NULL;
2259
2260         /* Get a superblock - note that we may end up sharing one that already exists */
2261         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2262         if (IS_ERR(s)) {
2263                 error = PTR_ERR(s);
2264                 goto out_err_nosb;
2265         }
2266
2267         if (s->s_fs_info != server) {
2268                 nfs_free_server(server);
2269                 server = NULL;
2270         } else {
2271                 error = nfs_bdi_register(server);
2272                 if (error)
2273                         goto error_splat_super;
2274         }
2275
2276         if (!s->s_root) {
2277                 /* initial superblock/root creation */
2278                 nfs4_fill_super(s);
2279         }
2280
2281         mntroot = nfs4_get_root(s, &mntfh);
2282         if (IS_ERR(mntroot)) {
2283                 error = PTR_ERR(mntroot);
2284                 goto error_splat_super;
2285         }
2286         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2287                 dput(mntroot);
2288                 error = -ESTALE;
2289                 goto error_splat_super;
2290         }
2291
2292         s->s_flags |= MS_ACTIVE;
2293         mnt->mnt_sb = s;
2294         mnt->mnt_root = mntroot;
2295
2296         security_sb_clone_mnt_opts(data->sb, s);
2297
2298         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2299         return 0;
2300
2301 out_err_nosb:
2302         nfs_free_server(server);
2303 out_err_noserver:
2304         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2305         return error;
2306
2307 error_splat_super:
2308         up_write(&s->s_umount);
2309         deactivate_super(s);
2310         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2311         return error;
2312 }
2313
2314 #endif /* CONFIG_NFS_V4 */