err.no Git - linux-2.6/blob - fs/nfs/super.c

   1 /*
   2  *  linux/fs/nfs/super.c
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  nfs superblock handling functions
   7  *
   8  *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
   9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10  *
  11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12  *  J.S.Peatfield@damtp.cam.ac.uk
  13  *
  14  *  Split from inode.c by David Howells <dhowells@redhat.com>
  15  *
  16  * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
  17  *   particular server are held in the same superblock
  18  * - NFS superblocks can have several effective roots to the dentry tree
  19  * - directory type roots are spliced into the tree when a path from one root reaches the root
  20  *   of another (see nfs_lookup())
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25
  26 #include <linux/time.h>
  27 #include <linux/kernel.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/stat.h>
  31 #include <linux/errno.h>
  32 #include <linux/unistd.h>
  33 #include <linux/sunrpc/clnt.h>
  34 #include <linux/sunrpc/stats.h>
  35 #include <linux/sunrpc/metrics.h>
  36 #include <linux/sunrpc/xprtsock.h>
  37 #include <linux/sunrpc/xprtrdma.h>
  38 #include <linux/nfs_fs.h>
  39 #include <linux/nfs_mount.h>
  40 #include <linux/nfs4_mount.h>
  41 #include <linux/lockd/bind.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/mount.h>
  45 #include <linux/nfs_idmap.h>
  46 #include <linux/vfs.h>
  47 #include <linux/inet.h>
  48 #include <linux/in6.h>
  49 #include <net/ipv6.h>
  50 #include <linux/nfs_xdr.h>
  51 #include <linux/magic.h>
  52 #include <linux/parser.h>
  53
  54 #include <asm/system.h>
  55 #include <asm/uaccess.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "callback.h"
  59 #include "delegation.h"
  60 #include "iostat.h"
  61 #include "internal.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_VFS
  64
  65 enum {
  66         /* Mount options that take no arguments */
  67         Opt_soft, Opt_hard,
  68         Opt_intr, Opt_nointr,
  69         Opt_posix, Opt_noposix,
  70         Opt_cto, Opt_nocto,
  71         Opt_ac, Opt_noac,
  72         Opt_lock, Opt_nolock,
  73         Opt_v2, Opt_v3,
  74         Opt_udp, Opt_tcp, Opt_rdma,
  75         Opt_acl, Opt_noacl,
  76         Opt_rdirplus, Opt_nordirplus,
  77         Opt_sharecache, Opt_nosharecache,
  78
  79         /* Mount options that take integer arguments */
  80         Opt_port,
  81         Opt_rsize, Opt_wsize, Opt_bsize,
  82         Opt_timeo, Opt_retrans,
  83         Opt_acregmin, Opt_acregmax,
  84         Opt_acdirmin, Opt_acdirmax,
  85         Opt_actimeo,
  86         Opt_namelen,
  87         Opt_mountport,
  88         Opt_mountvers,
  89         Opt_nfsvers,
  90
  91         /* Mount options that take string arguments */
  92         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
  93         Opt_addr, Opt_mountaddr, Opt_clientaddr,
  94
  95         /* Mount options that are ignored */
  96         Opt_userspace, Opt_deprecated,
  97
  98         Opt_err
  99 };
 100
 101 static match_table_t nfs_mount_option_tokens = {
 102         { Opt_userspace, "bg" },
 103         { Opt_userspace, "fg" },
 104         { Opt_soft, "soft" },
 105         { Opt_hard, "hard" },
 106         { Opt_intr, "intr" },
 107         { Opt_nointr, "nointr" },
 108         { Opt_posix, "posix" },
 109         { Opt_noposix, "noposix" },
 110         { Opt_cto, "cto" },
 111         { Opt_nocto, "nocto" },
 112         { Opt_ac, "ac" },
 113         { Opt_noac, "noac" },
 114         { Opt_lock, "lock" },
 115         { Opt_nolock, "nolock" },
 116         { Opt_v2, "v2" },
 117         { Opt_v3, "v3" },
 118         { Opt_udp, "udp" },
 119         { Opt_tcp, "tcp" },
 120         { Opt_rdma, "rdma" },
 121         { Opt_acl, "acl" },
 122         { Opt_noacl, "noacl" },
 123         { Opt_rdirplus, "rdirplus" },
 124         { Opt_nordirplus, "nordirplus" },
 125         { Opt_sharecache, "sharecache" },
 126         { Opt_nosharecache, "nosharecache" },
 127
 128         { Opt_port, "port=%u" },
 129         { Opt_rsize, "rsize=%u" },
 130         { Opt_wsize, "wsize=%u" },
 131         { Opt_bsize, "bsize=%u" },
 132         { Opt_timeo, "timeo=%u" },
 133         { Opt_retrans, "retrans=%u" },
 134         { Opt_acregmin, "acregmin=%u" },
 135         { Opt_acregmax, "acregmax=%u" },
 136         { Opt_acdirmin, "acdirmin=%u" },
 137         { Opt_acdirmax, "acdirmax=%u" },
 138         { Opt_actimeo, "actimeo=%u" },
 139         { Opt_userspace, "retry=%u" },
 140         { Opt_namelen, "namlen=%u" },
 141         { Opt_mountport, "mountport=%u" },
 142         { Opt_mountvers, "mountvers=%u" },
 143         { Opt_nfsvers, "nfsvers=%u" },
 144         { Opt_nfsvers, "vers=%u" },
 145
 146         { Opt_sec, "sec=%s" },
 147         { Opt_proto, "proto=%s" },
 148         { Opt_mountproto, "mountproto=%s" },
 149         { Opt_addr, "addr=%s" },
 150         { Opt_clientaddr, "clientaddr=%s" },
 151         { Opt_mounthost, "mounthost=%s" },
 152         { Opt_mountaddr, "mountaddr=%s" },
 153
 154         { Opt_err, NULL }
 155 };
 156
 157 enum {
 158         Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 159
 160         Opt_xprt_err
 161 };
 162
 163 static match_table_t nfs_xprt_protocol_tokens = {
 164         { Opt_xprt_udp, "udp" },
 165         { Opt_xprt_tcp, "tcp" },
 166         { Opt_xprt_rdma, "rdma" },
 167
 168         { Opt_xprt_err, NULL }
 169 };
 170
 171 enum {
 172         Opt_sec_none, Opt_sec_sys,
 173         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 174         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 175         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 176
 177         Opt_sec_err
 178 };
 179
 180 static match_table_t nfs_secflavor_tokens = {
 181         { Opt_sec_none, "none" },
 182         { Opt_sec_none, "null" },
 183         { Opt_sec_sys, "sys" },
 184
 185         { Opt_sec_krb5, "krb5" },
 186         { Opt_sec_krb5i, "krb5i" },
 187         { Opt_sec_krb5p, "krb5p" },
 188
 189         { Opt_sec_lkey, "lkey" },
 190         { Opt_sec_lkeyi, "lkeyi" },
 191         { Opt_sec_lkeyp, "lkeyp" },
 192
 193         { Opt_sec_spkm, "spkm3" },
 194         { Opt_sec_spkmi, "spkm3i" },
 195         { Opt_sec_spkmp, "spkm3p" },
 196
 197         { Opt_sec_err, NULL }
 198 };
 199
 200
 201 static void nfs_umount_begin(struct vfsmount *, int);
 202 static int  nfs_statfs(struct dentry *, struct kstatfs *);
 203 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
 204 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
 205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
 206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
 207                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 208 static void nfs_kill_super(struct super_block *);
 209 static void nfs_put_super(struct super_block *);
 210
 211 static struct file_system_type nfs_fs_type = {
 212         .owner          = THIS_MODULE,
 213         .name           = "nfs",
 214         .get_sb         = nfs_get_sb,
 215         .kill_sb        = nfs_kill_super,
 216         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 217 };
 218
 219 struct file_system_type nfs_xdev_fs_type = {
 220         .owner          = THIS_MODULE,
 221         .name           = "nfs",
 222         .get_sb         = nfs_xdev_get_sb,
 223         .kill_sb        = nfs_kill_super,
 224         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 225 };
 226
 227 static const struct super_operations nfs_sops = {
 228         .alloc_inode    = nfs_alloc_inode,
 229         .destroy_inode  = nfs_destroy_inode,
 230         .write_inode    = nfs_write_inode,
 231         .put_super      = nfs_put_super,
 232         .statfs         = nfs_statfs,
 233         .clear_inode    = nfs_clear_inode,
 234         .umount_begin   = nfs_umount_begin,
 235         .show_options   = nfs_show_options,
 236         .show_stats     = nfs_show_stats,
 237 };
 238
 239 #ifdef CONFIG_NFS_V4
 240 static int nfs4_get_sb(struct file_system_type *fs_type,
 241         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 242 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
 243         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 244 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
 245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
 246 static void nfs4_kill_super(struct super_block *sb);
 247
 248 static struct file_system_type nfs4_fs_type = {
 249         .owner          = THIS_MODULE,
 250         .name           = "nfs4",
 251         .get_sb         = nfs4_get_sb,
 252         .kill_sb        = nfs4_kill_super,
 253         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 254 };
 255
 256 struct file_system_type nfs4_xdev_fs_type = {
 257         .owner          = THIS_MODULE,
 258         .name           = "nfs4",
 259         .get_sb         = nfs4_xdev_get_sb,
 260         .kill_sb        = nfs4_kill_super,
 261         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 262 };
 263
 264 struct file_system_type nfs4_referral_fs_type = {
 265         .owner          = THIS_MODULE,
 266         .name           = "nfs4",
 267         .get_sb         = nfs4_referral_get_sb,
 268         .kill_sb        = nfs4_kill_super,
 269         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 270 };
 271
 272 static const struct super_operations nfs4_sops = {
 273         .alloc_inode    = nfs_alloc_inode,
 274         .destroy_inode  = nfs_destroy_inode,
 275         .write_inode    = nfs_write_inode,
 276         .statfs         = nfs_statfs,
 277         .clear_inode    = nfs4_clear_inode,
 278         .umount_begin   = nfs_umount_begin,
 279         .show_options   = nfs_show_options,
 280         .show_stats     = nfs_show_stats,
 281 };
 282 #endif
 283
 284 static struct shrinker acl_shrinker = {
 285         .shrink         = nfs_access_cache_shrinker,
 286         .seeks          = DEFAULT_SEEKS,
 287 };
 288
 289 /*
 290  * Register the NFS filesystems
 291  */
 292 int __init register_nfs_fs(void)
 293 {
 294         int ret;
 295
 296         ret = register_filesystem(&nfs_fs_type);
 297         if (ret < 0)
 298                 goto error_0;
 299
 300         ret = nfs_register_sysctl();
 301         if (ret < 0)
 302                 goto error_1;
 303 #ifdef CONFIG_NFS_V4
 304         ret = register_filesystem(&nfs4_fs_type);
 305         if (ret < 0)
 306                 goto error_2;
 307 #endif
 308         register_shrinker(&acl_shrinker);
 309         return 0;
 310
 311 #ifdef CONFIG_NFS_V4
 312 error_2:
 313         nfs_unregister_sysctl();
 314 #endif
 315 error_1:
 316         unregister_filesystem(&nfs_fs_type);
 317 error_0:
 318         return ret;
 319 }
 320
 321 /*
 322  * Unregister the NFS filesystems
 323  */
 324 void __exit unregister_nfs_fs(void)
 325 {
 326         unregister_shrinker(&acl_shrinker);
 327 #ifdef CONFIG_NFS_V4
 328         unregister_filesystem(&nfs4_fs_type);
 329 #endif
 330         nfs_unregister_sysctl();
 331         unregister_filesystem(&nfs_fs_type);
 332 }
 333
 334 void nfs_sb_active(struct nfs_server *server)
 335 {
 336         atomic_inc(&server->active);
 337 }
 338
 339 void nfs_sb_deactive(struct nfs_server *server)
 340 {
 341         if (atomic_dec_and_test(&server->active))
 342                 wake_up(&server->active_wq);
 343 }
 344
 345 static void nfs_put_super(struct super_block *sb)
 346 {
 347         struct nfs_server *server = NFS_SB(sb);
 348         /*
 349          * Make sure there are no outstanding ops to this server.
 350          * If so, wait for them to finish before allowing the
 351          * unmount to continue.
 352          */
 353         wait_event(server->active_wq, atomic_read(&server->active) == 0);
 354 }
 355
 356 /*
 357  * Deliver file system statistics to userspace
 358  */
 359 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 360 {
 361         struct nfs_server *server = NFS_SB(dentry->d_sb);
 362         unsigned char blockbits;
 363         unsigned long blockres;
 364         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 365         struct nfs_fattr fattr;
 366         struct nfs_fsstat res = {
 367                         .fattr = &fattr,
 368         };
 369         int error;
 370
 371         lock_kernel();
 372
 373         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 374         if (error < 0)
 375                 goto out_err;
 376         buf->f_type = NFS_SUPER_MAGIC;
 377
 378         /*
 379          * Current versions of glibc do not correctly handle the
 380          * case where f_frsize != f_bsize.  Eventually we want to
 381          * report the value of wtmult in this field.
 382          */
 383         buf->f_frsize = dentry->d_sb->s_blocksize;
 384
 385         /*
 386          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 387          * are reported in units of f_frsize.  Linux hasn't had
 388          * an f_frsize field in its statfs struct until recently,
 389          * thus historically Linux's sys_statfs reports these
 390          * fields in units of f_bsize.
 391          */
 392         buf->f_bsize = dentry->d_sb->s_blocksize;
 393         blockbits = dentry->d_sb->s_blocksize_bits;
 394         blockres = (1 << blockbits) - 1;
 395         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 396         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 397         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 398
 399         buf->f_files = res.tfiles;
 400         buf->f_ffree = res.afiles;
 401
 402         buf->f_namelen = server->namelen;
 403
 404         unlock_kernel();
 405         return 0;
 406
 407  out_err:
 408         dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
 409         unlock_kernel();
 410         return error;
 411 }
 412
 413 /*
 414  * Map the security flavour number to a name
 415  */
 416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 417 {
 418         static const struct {
 419                 rpc_authflavor_t flavour;
 420                 const char *str;
 421         } sec_flavours[] = {
 422                 { RPC_AUTH_NULL, "null" },
 423                 { RPC_AUTH_UNIX, "sys" },
 424                 { RPC_AUTH_GSS_KRB5, "krb5" },
 425                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
 426                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
 427                 { RPC_AUTH_GSS_LKEY, "lkey" },
 428                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
 429                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
 430                 { RPC_AUTH_GSS_SPKM, "spkm" },
 431                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
 432                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
 433                 { UINT_MAX, "unknown" }
 434         };
 435         int i;
 436
 437         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 438                 if (sec_flavours[i].flavour == flavour)
 439                         break;
 440         }
 441         return sec_flavours[i].str;
 442 }
 443
 444 /*
 445  * Describe the mount options in force on this server representation
 446  */
 447 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
 448 {
 449         static const struct proc_nfs_info {
 450                 int flag;
 451                 const char *str;
 452                 const char *nostr;
 453         } nfs_info[] = {
 454                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 455                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 456                 { NFS_MOUNT_NOAC, ",noac", "" },
 457                 { NFS_MOUNT_NONLM, ",nolock", "" },
 458                 { NFS_MOUNT_NOACL, ",noacl", "" },
 459                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 460                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
 461                 { 0, NULL, NULL }
 462         };
 463         const struct proc_nfs_info *nfs_infop;
 464         struct nfs_client *clp = nfss->nfs_client;
 465
 466         seq_printf(m, ",vers=%d", clp->rpc_ops->version);
 467         seq_printf(m, ",rsize=%d", nfss->rsize);
 468         seq_printf(m, ",wsize=%d", nfss->wsize);
 469         if (nfss->acregmin != 3*HZ || showdefaults)
 470                 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
 471         if (nfss->acregmax != 60*HZ || showdefaults)
 472                 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
 473         if (nfss->acdirmin != 30*HZ || showdefaults)
 474                 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
 475         if (nfss->acdirmax != 60*HZ || showdefaults)
 476                 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
 477         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 478                 if (nfss->flags & nfs_infop->flag)
 479                         seq_puts(m, nfs_infop->str);
 480                 else
 481                         seq_puts(m, nfs_infop->nostr);
 482         }
 483         seq_printf(m, ",proto=%s",
 484                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 485         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 486         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 487         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 488 }
 489
 490 /*
 491  * Describe the mount options on this VFS mountpoint
 492  */
 493 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 494 {
 495         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 496
 497         nfs_show_mount_options(m, nfss, 0);
 498
 499         seq_printf(m, ",addr=%s",
 500                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 501                                                         RPC_DISPLAY_ADDR));
 502
 503         return 0;
 504 }
 505
 506 /*
 507  * Present statistical information for this VFS mountpoint
 508  */
 509 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
 510 {
 511         int i, cpu;
 512         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 513         struct rpc_auth *auth = nfss->client->cl_auth;
 514         struct nfs_iostats totals = { };
 515
 516         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 517
 518         /*
 519          * Display all mount option settings
 520          */
 521         seq_printf(m, "\n\topts:\t");
 522         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 523         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 524         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 525         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 526         nfs_show_mount_options(m, nfss, 1);
 527
 528         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 529
 530         seq_printf(m, "\n\tcaps:\t");
 531         seq_printf(m, "caps=0x%x", nfss->caps);
 532         seq_printf(m, ",wtmult=%d", nfss->wtmult);
 533         seq_printf(m, ",dtsize=%d", nfss->dtsize);
 534         seq_printf(m, ",bsize=%d", nfss->bsize);
 535         seq_printf(m, ",namelen=%d", nfss->namelen);
 536
 537 #ifdef CONFIG_NFS_V4
 538         if (nfss->nfs_client->rpc_ops->version == 4) {
 539                 seq_printf(m, "\n\tnfsv4:\t");
 540                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 541                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 542                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 543         }
 544 #endif
 545
 546         /*
 547          * Display security flavor in effect for this mount
 548          */
 549         seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
 550         if (auth->au_flavor)
 551                 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
 552
 553         /*
 554          * Display superblock I/O counters
 555          */
 556         for_each_possible_cpu(cpu) {
 557                 struct nfs_iostats *stats;
 558
 559                 preempt_disable();
 560                 stats = per_cpu_ptr(nfss->io_stats, cpu);
 561
 562                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 563                         totals.events[i] += stats->events[i];
 564                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 565                         totals.bytes[i] += stats->bytes[i];
 566
 567                 preempt_enable();
 568         }
 569
 570         seq_printf(m, "\n\tevents:\t");
 571         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 572                 seq_printf(m, "%lu ", totals.events[i]);
 573         seq_printf(m, "\n\tbytes:\t");
 574         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 575                 seq_printf(m, "%Lu ", totals.bytes[i]);
 576         seq_printf(m, "\n");
 577
 578         rpc_print_iostats(m, nfss->client);
 579
 580         return 0;
 581 }
 582
 583 /*
 584  * Begin unmount by attempting to remove all automounted mountpoints we added
 585  * in response to xdev traversals and referrals
 586  */
 587 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 588 {
 589         struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
 590         struct rpc_clnt *rpc;
 591
 592         shrink_submounts(vfsmnt, &nfs_automount_list);
 593
 594         if (!(flags & MNT_FORCE))
 595                 return;
 596         /* -EIO all pending I/O */
 597         rpc = server->client_acl;
 598         if (!IS_ERR(rpc))
 599                 rpc_killall_tasks(rpc);
 600         rpc = server->client;
 601         if (!IS_ERR(rpc))
 602                 rpc_killall_tasks(rpc);
 603 }
 604
 605 /*
 606  * Set the port number in an address.  Be agnostic about the address family.
 607  */
 608 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 609 {
 610         switch (sap->sa_family) {
 611         case AF_INET: {
 612                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 613                 ap->sin_port = htons(port);
 614                 break;
 615         }
 616         case AF_INET6: {
 617                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 618                 ap->sin6_port = htons(port);
 619                 break;
 620         }
 621         }
 622 }
 623
 624 /*
 625  * Sanity-check a server address provided by the mount command.
 626  *
 627  * Address family must be initialized, and address must not be
 628  * the ANY address for that family.
 629  */
 630 static int nfs_verify_server_address(struct sockaddr *addr)
 631 {
 632         switch (addr->sa_family) {
 633         case AF_INET: {
 634                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 635                 return sa->sin_addr.s_addr != INADDR_ANY;
 636         }
 637         case AF_INET6: {
 638                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 639                 return !ipv6_addr_any(sa);
 640         }
 641         }
 642
 643         return 0;
 644 }
 645
 646 /*
 647  * Parse string addresses passed in via a mount option,
 648  * and construct a sockaddr based on the result.
 649  *
 650  * If address parsing fails, set the sockaddr's address
 651  * family to AF_UNSPEC to force nfs_verify_server_address()
 652  * to punt the mount.
 653  */
 654 static void nfs_parse_server_address(char *value,
 655                                      struct sockaddr *sap,
 656                                      size_t *len)
 657 {
 658         if (strchr(value, ':')) {
 659                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 660                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 661
 662                 ap->sin6_family = AF_INET6;
 663                 *len = sizeof(*ap);
 664                 if (in6_pton(value, -1, addr, '\0', NULL))
 665                         return;
 666         } else {
 667                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 668                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 669
 670                 ap->sin_family = AF_INET;
 671                 *len = sizeof(*ap);
 672                 if (in4_pton(value, -1, addr, '\0', NULL))
 673                         return;
 674         }
 675
 676         sap->sa_family = AF_UNSPEC;
 677         *len = 0;
 678 }
 679
 680 /*
 681  * Error-check and convert a string of mount options from user space into
 682  * a data structure
 683  */
 684 static int nfs_parse_mount_options(char *raw,
 685                                    struct nfs_parsed_mount_data *mnt)
 686 {
 687         char *p, *string, *secdata;
 688         unsigned short port = 0;
 689         int rc;
 690
 691         if (!raw) {
 692                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 693                 return 1;
 694         }
 695         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 696
 697         secdata = alloc_secdata();
 698         if (!secdata)
 699                 goto out_nomem;
 700
 701         rc = security_sb_copy_data(raw, secdata);
 702         if (rc)
 703                 goto out_security_failure;
 704
 705         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 706         if (rc)
 707                 goto out_security_failure;
 708
 709         free_secdata(secdata);
 710
 711         while ((p = strsep(&raw, ",")) != NULL) {
 712                 substring_t args[MAX_OPT_ARGS];
 713                 int option, token;
 714
 715                 if (!*p)
 716                         continue;
 717
 718                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 719
 720                 token = match_token(p, nfs_mount_option_tokens, args);
 721                 switch (token) {
 722                 case Opt_soft:
 723                         mnt->flags |= NFS_MOUNT_SOFT;
 724                         break;
 725                 case Opt_hard:
 726                         mnt->flags &= ~NFS_MOUNT_SOFT;
 727                         break;
 728                 case Opt_intr:
 729                 case Opt_nointr:
 730                         break;
 731                 case Opt_posix:
 732                         mnt->flags |= NFS_MOUNT_POSIX;
 733                         break;
 734                 case Opt_noposix:
 735                         mnt->flags &= ~NFS_MOUNT_POSIX;
 736                         break;
 737                 case Opt_cto:
 738                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 739                         break;
 740                 case Opt_nocto:
 741                         mnt->flags |= NFS_MOUNT_NOCTO;
 742                         break;
 743                 case Opt_ac:
 744                         mnt->flags &= ~NFS_MOUNT_NOAC;
 745                         break;
 746                 case Opt_noac:
 747                         mnt->flags |= NFS_MOUNT_NOAC;
 748                         break;
 749                 case Opt_lock:
 750                         mnt->flags &= ~NFS_MOUNT_NONLM;
 751                         break;
 752                 case Opt_nolock:
 753                         mnt->flags |= NFS_MOUNT_NONLM;
 754                         break;
 755                 case Opt_v2:
 756                         mnt->flags &= ~NFS_MOUNT_VER3;
 757                         break;
 758                 case Opt_v3:
 759                         mnt->flags |= NFS_MOUNT_VER3;
 760                         break;
 761                 case Opt_udp:
 762                         mnt->flags &= ~NFS_MOUNT_TCP;
 763                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 764                         mnt->timeo = 7;
 765                         mnt->retrans = 5;
 766                         break;
 767                 case Opt_tcp:
 768                         mnt->flags |= NFS_MOUNT_TCP;
 769                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 770                         mnt->timeo = 600;
 771                         mnt->retrans = 2;
 772                         break;
 773                 case Opt_rdma:
 774                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 775                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 776                         mnt->timeo = 600;
 777                         mnt->retrans = 2;
 778                         break;
 779                 case Opt_acl:
 780                         mnt->flags &= ~NFS_MOUNT_NOACL;
 781                         break;
 782                 case Opt_noacl:
 783                         mnt->flags |= NFS_MOUNT_NOACL;
 784                         break;
 785                 case Opt_rdirplus:
 786                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 787                         break;
 788                 case Opt_nordirplus:
 789                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 790                         break;
 791                 case Opt_sharecache:
 792                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 793                         break;
 794                 case Opt_nosharecache:
 795                         mnt->flags |= NFS_MOUNT_UNSHARED;
 796                         break;
 797
 798                 case Opt_port:
 799                         if (match_int(args, &option))
 800                                 return 0;
 801                         if (option < 0 || option > 65535)
 802                                 return 0;
 803                         port = option;
 804                         break;
 805                 case Opt_rsize:
 806                         if (match_int(args, &mnt->rsize))
 807                                 return 0;
 808                         break;
 809                 case Opt_wsize:
 810                         if (match_int(args, &mnt->wsize))
 811                                 return 0;
 812                         break;
 813                 case Opt_bsize:
 814                         if (match_int(args, &option))
 815                                 return 0;
 816                         if (option < 0)
 817                                 return 0;
 818                         mnt->bsize = option;
 819                         break;
 820                 case Opt_timeo:
 821                         if (match_int(args, &mnt->timeo))
 822                                 return 0;
 823                         break;
 824                 case Opt_retrans:
 825                         if (match_int(args, &mnt->retrans))
 826                                 return 0;
 827                         break;
 828                 case Opt_acregmin:
 829                         if (match_int(args, &mnt->acregmin))
 830                                 return 0;
 831                         break;
 832                 case Opt_acregmax:
 833                         if (match_int(args, &mnt->acregmax))
 834                                 return 0;
 835                         break;
 836                 case Opt_acdirmin:
 837                         if (match_int(args, &mnt->acdirmin))
 838                                 return 0;
 839                         break;
 840                 case Opt_acdirmax:
 841                         if (match_int(args, &mnt->acdirmax))
 842                                 return 0;
 843                         break;
 844                 case Opt_actimeo:
 845                         if (match_int(args, &option))
 846                                 return 0;
 847                         if (option < 0)
 848                                 return 0;
 849                         mnt->acregmin =
 850                         mnt->acregmax =
 851                         mnt->acdirmin =
 852                         mnt->acdirmax = option;
 853                         break;
 854                 case Opt_namelen:
 855                         if (match_int(args, &mnt->namlen))
 856                                 return 0;
 857                         break;
 858                 case Opt_mountport:
 859                         if (match_int(args, &option))
 860                                 return 0;
 861                         if (option < 0 || option > 65535)
 862                                 return 0;
 863                         mnt->mount_server.port = option;
 864                         break;
 865                 case Opt_mountvers:
 866                         if (match_int(args, &option))
 867                                 return 0;
 868                         if (option < 0)
 869                                 return 0;
 870                         mnt->mount_server.version = option;
 871                         break;
 872                 case Opt_nfsvers:
 873                         if (match_int(args, &option))
 874                                 return 0;
 875                         switch (option) {
 876                         case 2:
 877                                 mnt->flags &= ~NFS_MOUNT_VER3;
 878                                 break;
 879                         case 3:
 880                                 mnt->flags |= NFS_MOUNT_VER3;
 881                                 break;
 882                         default:
 883                                 goto out_unrec_vers;
 884                         }
 885                         break;
 886
 887                 case Opt_sec:
 888                         string = match_strdup(args);
 889                         if (string == NULL)
 890                                 goto out_nomem;
 891                         token = match_token(string, nfs_secflavor_tokens, args);
 892                         kfree(string);
 893
 894                         /*
 895                          * The flags setting is for v2/v3.  The flavor_len
 896                          * setting is for v4.  v2/v3 also need to know the
 897                          * difference between NULL and UNIX.
 898                          */
 899                         switch (token) {
 900                         case Opt_sec_none:
 901                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 902                                 mnt->auth_flavor_len = 0;
 903                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 904                                 break;
 905                         case Opt_sec_sys:
 906                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 907                                 mnt->auth_flavor_len = 0;
 908                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 909                                 break;
 910                         case Opt_sec_krb5:
 911                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 912                                 mnt->auth_flavor_len = 1;
 913                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 914                                 break;
 915                         case Opt_sec_krb5i:
 916                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 917                                 mnt->auth_flavor_len = 1;
 918                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 919                                 break;
 920                         case Opt_sec_krb5p:
 921                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 922                                 mnt->auth_flavor_len = 1;
 923                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 924                                 break;
 925                         case Opt_sec_lkey:
 926                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 927                                 mnt->auth_flavor_len = 1;
 928                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 929                                 break;
 930                         case Opt_sec_lkeyi:
 931                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 932                                 mnt->auth_flavor_len = 1;
 933                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 934                                 break;
 935                         case Opt_sec_lkeyp:
 936                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 937                                 mnt->auth_flavor_len = 1;
 938                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
 939                                 break;
 940                         case Opt_sec_spkm:
 941                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 942                                 mnt->auth_flavor_len = 1;
 943                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
 944                                 break;
 945                         case Opt_sec_spkmi:
 946                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 947                                 mnt->auth_flavor_len = 1;
 948                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
 949                                 break;
 950                         case Opt_sec_spkmp:
 951                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 952                                 mnt->auth_flavor_len = 1;
 953                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
 954                                 break;
 955                         default:
 956                                 goto out_unrec_sec;
 957                         }
 958                         break;
 959                 case Opt_proto:
 960                         string = match_strdup(args);
 961                         if (string == NULL)
 962                                 goto out_nomem;
 963                         token = match_token(string,
 964                                             nfs_xprt_protocol_tokens, args);
 965                         kfree(string);
 966
 967                         switch (token) {
 968                         case Opt_xprt_udp:
 969                                 mnt->flags &= ~NFS_MOUNT_TCP;
 970                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 971                                 mnt->timeo = 7;
 972                                 mnt->retrans = 5;
 973                                 break;
 974                         case Opt_xprt_tcp:
 975                                 mnt->flags |= NFS_MOUNT_TCP;
 976                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 977                                 mnt->timeo = 600;
 978                                 mnt->retrans = 2;
 979                                 break;
 980                         case Opt_xprt_rdma:
 981                                 /* vector side protocols to TCP */
 982                                 mnt->flags |= NFS_MOUNT_TCP;
 983                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 984                                 mnt->timeo = 600;
 985                                 mnt->retrans = 2;
 986                                 break;
 987                         default:
 988                                 goto out_unrec_xprt;
 989                         }
 990                         break;
 991                 case Opt_mountproto:
 992                         string = match_strdup(args);
 993                         if (string == NULL)
 994                                 goto out_nomem;
 995                         token = match_token(string,
 996                                             nfs_xprt_protocol_tokens, args);
 997                         kfree(string);
 998
 999                         switch (token) {
1000                         case Opt_xprt_udp:
1001                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1002                                 break;
1003                         case Opt_xprt_tcp:
1004                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1005                                 break;
1006                         case Opt_xprt_rdma: /* not used for side protocols */
1007                         default:
1008                                 goto out_unrec_xprt;
1009                         }
1010                         break;
1011                 case Opt_addr:
1012                         string = match_strdup(args);
1013                         if (string == NULL)
1014                                 goto out_nomem;
1015                         nfs_parse_server_address(string, (struct sockaddr *)
1016                                                  &mnt->nfs_server.address,
1017                                                  &mnt->nfs_server.addrlen);
1018                         kfree(string);
1019                         break;
1020                 case Opt_clientaddr:
1021                         string = match_strdup(args);
1022                         if (string == NULL)
1023                                 goto out_nomem;
1024                         kfree(mnt->client_address);
1025                         mnt->client_address = string;
1026                         break;
1027                 case Opt_mounthost:
1028                         string = match_strdup(args);
1029                         if (string == NULL)
1030                                 goto out_nomem;
1031                         kfree(mnt->mount_server.hostname);
1032                         mnt->mount_server.hostname = string;
1033                         break;
1034                 case Opt_mountaddr:
1035                         string = match_strdup(args);
1036                         if (string == NULL)
1037                                 goto out_nomem;
1038                         nfs_parse_server_address(string, (struct sockaddr *)
1039                                                  &mnt->mount_server.address,
1040                                                  &mnt->mount_server.addrlen);
1041                         kfree(string);
1042                         break;
1043
1044                 case Opt_userspace:
1045                 case Opt_deprecated:
1046                         break;
1047
1048                 default:
1049                         goto out_unknown;
1050                 }
1051         }
1052
1053         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port);
1054
1055         return 1;
1056
1057 out_nomem:
1058         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1059         return 0;
1060 out_security_failure:
1061         free_secdata(secdata);
1062         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1063         return 0;
1064 out_unrec_vers:
1065         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1066         return 0;
1067
1068 out_unrec_xprt:
1069         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1070         return 0;
1071
1072 out_unrec_sec:
1073         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1074         return 0;
1075
1076 out_unknown:
1077         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1078         return 0;
1079 }
1080
1081 /*
1082  * Use the remote server's MOUNT service to request the NFS file handle
1083  * corresponding to the provided path.
1084  */
1085 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1086                          struct nfs_fh *root_fh)
1087 {
1088         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1089         char *hostname;
1090         int status;
1091
1092         if (args->mount_server.version == 0) {
1093                 if (args->flags & NFS_MOUNT_VER3)
1094                         args->mount_server.version = NFS_MNT3_VERSION;
1095                 else
1096                         args->mount_server.version = NFS_MNT_VERSION;
1097         }
1098
1099         if (args->mount_server.hostname)
1100                 hostname = args->mount_server.hostname;
1101         else
1102                 hostname = args->nfs_server.hostname;
1103
1104         /*
1105          * Construct the mount server's address.
1106          */
1107         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1108                 memcpy(sap, &args->nfs_server.address,
1109                        args->nfs_server.addrlen);
1110                 args->mount_server.addrlen = args->nfs_server.addrlen;
1111         }
1112
1113         /*
1114          * autobind will be used if mount_server.port == 0
1115          */
1116         nfs_set_port(sap, args->mount_server.port);
1117
1118         /*
1119          * Now ask the mount server to map our export path
1120          * to a file handle.
1121          */
1122         status = nfs_mount(sap,
1123                            args->mount_server.addrlen,
1124                            hostname,
1125                            args->nfs_server.export_path,
1126                            args->mount_server.version,
1127                            args->mount_server.protocol,
1128                            root_fh);
1129         if (status == 0)
1130                 return 0;
1131
1132         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1133                         hostname, status);
1134         return status;
1135 }
1136
1137 /*
1138  * Validate the NFS2/NFS3 mount data
1139  * - fills in the mount root filehandle
1140  *
1141  * For option strings, user space handles the following behaviors:
1142  *
1143  * + DNS: mapping server host name to IP address ("addr=" option)
1144  *
1145  * + failure mode: how to behave if a mount request can't be handled
1146  *   immediately ("fg/bg" option)
1147  *
1148  * + retry: how often to retry a mount request ("retry=" option)
1149  *
1150  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1151  *   mountproto=tcp after mountproto=udp, and so on
1152  */
1153 static int nfs_validate_mount_data(void *options,
1154                                    struct nfs_parsed_mount_data *args,
1155                                    struct nfs_fh *mntfh,
1156                                    const char *dev_name)
1157 {
1158         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1159
1160         memset(args, 0, sizeof(*args));
1161
1162         if (data == NULL)
1163                 goto out_no_data;
1164
1165         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1166         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1167         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1168         args->timeo             = 600;
1169         args->retrans           = 2;
1170         args->acregmin          = 3;
1171         args->acregmax          = 60;
1172         args->acdirmin          = 30;
1173         args->acdirmax          = 60;
1174         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1175         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1176
1177         switch (data->version) {
1178         case 1:
1179                 data->namlen = 0;
1180         case 2:
1181                 data->bsize = 0;
1182         case 3:
1183                 if (data->flags & NFS_MOUNT_VER3)
1184                         goto out_no_v3;
1185                 data->root.size = NFS2_FHSIZE;
1186                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1187         case 4:
1188                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1189                         goto out_no_sec;
1190         case 5:
1191                 memset(data->context, 0, sizeof(data->context));
1192         case 6:
1193                 if (data->flags & NFS_MOUNT_VER3)
1194                         mntfh->size = data->root.size;
1195                 else
1196                         mntfh->size = NFS2_FHSIZE;
1197
1198                 if (mntfh->size > sizeof(mntfh->data))
1199                         goto out_invalid_fh;
1200
1201                 memcpy(mntfh->data, data->root.data, mntfh->size);
1202                 if (mntfh->size < sizeof(mntfh->data))
1203                         memset(mntfh->data + mntfh->size, 0,
1204                                sizeof(mntfh->data) - mntfh->size);
1205
1206                 /*
1207                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1208                  * can deal with.
1209                  */
1210                 args->flags             = data->flags;
1211                 args->rsize             = data->rsize;
1212                 args->wsize             = data->wsize;
1213                 args->flags             = data->flags;
1214                 args->timeo             = data->timeo;
1215                 args->retrans           = data->retrans;
1216                 args->acregmin          = data->acregmin;
1217                 args->acregmax          = data->acregmax;
1218                 args->acdirmin          = data->acdirmin;
1219                 args->acdirmax          = data->acdirmax;
1220
1221                 memcpy(&args->nfs_server.address, &data->addr,
1222                        sizeof(data->addr));
1223                 args->nfs_server.addrlen = sizeof(data->addr);
1224                 if (!nfs_verify_server_address((struct sockaddr *)
1225                                                 &args->nfs_server.address))
1226                         goto out_no_address;
1227
1228                 if (!(data->flags & NFS_MOUNT_TCP))
1229                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1230                 /* N.B. caller will free nfs_server.hostname in all cases */
1231                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1232                 args->namlen            = data->namlen;
1233                 args->bsize             = data->bsize;
1234                 args->auth_flavors[0]   = data->pseudoflavor;
1235
1236                 /*
1237                  * The legacy version 6 binary mount data from userspace has a
1238                  * field used only to transport selinux information into the
1239                  * the kernel.  To continue to support that functionality we
1240                  * have a touch of selinux knowledge here in the NFS code. The
1241                  * userspace code converted context=blah to just blah so we are
1242                  * converting back to the full string selinux understands.
1243                  */
1244                 if (data->context[0]){
1245 #ifdef CONFIG_SECURITY_SELINUX
1246                         int rc;
1247                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1248                         if (!opts_str)
1249                                 return -ENOMEM;
1250                         strcpy(opts_str, "context=");
1251                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1252                         strcat(opts_str, &data->context[0]);
1253                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1254                         kfree(opts_str);
1255                         if (rc)
1256                                 return rc;
1257 #else
1258                         return -EINVAL;
1259 #endif
1260                 }
1261
1262                 break;
1263         default: {
1264                 unsigned int len;
1265                 char *c;
1266                 int status;
1267
1268                 if (nfs_parse_mount_options((char *)options, args) == 0)
1269                         return -EINVAL;
1270
1271                 if (!nfs_verify_server_address((struct sockaddr *)
1272                                                 &args->nfs_server.address))
1273                         goto out_no_address;
1274
1275                 c = strchr(dev_name, ':');
1276                 if (c == NULL)
1277                         return -EINVAL;
1278                 len = c - dev_name;
1279                 /* N.B. caller will free nfs_server.hostname in all cases */
1280                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1281
1282                 c++;
1283                 if (strlen(c) > NFS_MAXPATHLEN)
1284                         return -ENAMETOOLONG;
1285                 args->nfs_server.export_path = c;
1286
1287                 status = nfs_try_mount(args, mntfh);
1288                 if (status)
1289                         return status;
1290
1291                 break;
1292                 }
1293         }
1294
1295         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1296                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1297
1298 #ifndef CONFIG_NFS_V3
1299         if (args->flags & NFS_MOUNT_VER3)
1300                 goto out_v3_not_compiled;
1301 #endif /* !CONFIG_NFS_V3 */
1302
1303         return 0;
1304
1305 out_no_data:
1306         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1307         return -EINVAL;
1308
1309 out_no_v3:
1310         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1311                  data->version);
1312         return -EINVAL;
1313
1314 out_no_sec:
1315         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1316         return -EINVAL;
1317
1318 #ifndef CONFIG_NFS_V3
1319 out_v3_not_compiled:
1320         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1321         return -EPROTONOSUPPORT;
1322 #endif /* !CONFIG_NFS_V3 */
1323
1324 out_no_address:
1325         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1326         return -EINVAL;
1327
1328 out_invalid_fh:
1329         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1330         return -EINVAL;
1331 }
1332
1333 /*
1334  * Initialise the common bits of the superblock
1335  */
1336 static inline void nfs_initialise_sb(struct super_block *sb)
1337 {
1338         struct nfs_server *server = NFS_SB(sb);
1339
1340         sb->s_magic = NFS_SUPER_MAGIC;
1341
1342         /* We probably want something more informative here */
1343         snprintf(sb->s_id, sizeof(sb->s_id),
1344                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1345
1346         if (sb->s_blocksize == 0)
1347                 sb->s_blocksize = nfs_block_bits(server->wsize,
1348                                                  &sb->s_blocksize_bits);
1349
1350         if (server->flags & NFS_MOUNT_NOAC)
1351                 sb->s_flags |= MS_SYNCHRONOUS;
1352
1353         nfs_super_set_maxbytes(sb, server->maxfilesize);
1354 }
1355
1356 /*
1357  * Finish setting up an NFS2/3 superblock
1358  */
1359 static void nfs_fill_super(struct super_block *sb,
1360                            struct nfs_parsed_mount_data *data)
1361 {
1362         struct nfs_server *server = NFS_SB(sb);
1363
1364         sb->s_blocksize_bits = 0;
1365         sb->s_blocksize = 0;
1366         if (data->bsize)
1367                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1368
1369         if (server->flags & NFS_MOUNT_VER3) {
1370                 /* The VFS shouldn't apply the umask to mode bits. We will do
1371                  * so ourselves when necessary.
1372                  */
1373                 sb->s_flags |= MS_POSIXACL;
1374                 sb->s_time_gran = 1;
1375         }
1376
1377         sb->s_op = &nfs_sops;
1378         nfs_initialise_sb(sb);
1379 }
1380
1381 /*
1382  * Finish setting up a cloned NFS2/3 superblock
1383  */
1384 static void nfs_clone_super(struct super_block *sb,
1385                             const struct super_block *old_sb)
1386 {
1387         struct nfs_server *server = NFS_SB(sb);
1388
1389         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1390         sb->s_blocksize = old_sb->s_blocksize;
1391         sb->s_maxbytes = old_sb->s_maxbytes;
1392
1393         if (server->flags & NFS_MOUNT_VER3) {
1394                 /* The VFS shouldn't apply the umask to mode bits. We will do
1395                  * so ourselves when necessary.
1396                  */
1397                 sb->s_flags |= MS_POSIXACL;
1398                 sb->s_time_gran = 1;
1399         }
1400
1401         sb->s_op = old_sb->s_op;
1402         nfs_initialise_sb(sb);
1403 }
1404
1405 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1406
1407 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1408 {
1409         const struct nfs_server *a = s->s_fs_info;
1410         const struct rpc_clnt *clnt_a = a->client;
1411         const struct rpc_clnt *clnt_b = b->client;
1412
1413         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1414                 goto Ebusy;
1415         if (a->nfs_client != b->nfs_client)
1416                 goto Ebusy;
1417         if (a->flags != b->flags)
1418                 goto Ebusy;
1419         if (a->wsize != b->wsize)
1420                 goto Ebusy;
1421         if (a->rsize != b->rsize)
1422                 goto Ebusy;
1423         if (a->acregmin != b->acregmin)
1424                 goto Ebusy;
1425         if (a->acregmax != b->acregmax)
1426                 goto Ebusy;
1427         if (a->acdirmin != b->acdirmin)
1428                 goto Ebusy;
1429         if (a->acdirmax != b->acdirmax)
1430                 goto Ebusy;
1431         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1432                 goto Ebusy;
1433         return 1;
1434 Ebusy:
1435         return 0;
1436 }
1437
1438 struct nfs_sb_mountdata {
1439         struct nfs_server *server;
1440         int mntflags;
1441 };
1442
1443 static int nfs_set_super(struct super_block *s, void *data)
1444 {
1445         struct nfs_sb_mountdata *sb_mntdata = data;
1446         struct nfs_server *server = sb_mntdata->server;
1447         int ret;
1448
1449         s->s_flags = sb_mntdata->mntflags;
1450         s->s_fs_info = server;
1451         ret = set_anon_super(s, server);
1452         if (ret == 0)
1453                 server->s_dev = s->s_dev;
1454         return ret;
1455 }
1456
1457 static int nfs_compare_super_address(struct nfs_server *server1,
1458                                      struct nfs_server *server2)
1459 {
1460         struct sockaddr *sap1, *sap2;
1461
1462         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1463         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1464
1465         if (sap1->sa_family != sap2->sa_family)
1466                 return 0;
1467
1468         switch (sap1->sa_family) {
1469         case AF_INET: {
1470                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1471                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1472                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1473                         return 0;
1474                 if (sin1->sin_port != sin2->sin_port)
1475                         return 0;
1476                 break;
1477         }
1478         case AF_INET6: {
1479                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1480                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1481                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1482                         return 0;
1483                 if (sin1->sin6_port != sin2->sin6_port)
1484                         return 0;
1485                 break;
1486         }
1487         default:
1488                 return 0;
1489         }
1490
1491         return 1;
1492 }
1493
1494 static int nfs_compare_super(struct super_block *sb, void *data)
1495 {
1496         struct nfs_sb_mountdata *sb_mntdata = data;
1497         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1498         int mntflags = sb_mntdata->mntflags;
1499
1500         if (!nfs_compare_super_address(old, server))
1501                 return 0;
1502         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1503         if (old->flags & NFS_MOUNT_UNSHARED)
1504                 return 0;
1505         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1506                 return 0;
1507         return nfs_compare_mount_options(sb, server, mntflags);
1508 }
1509
1510 static int nfs_get_sb(struct file_system_type *fs_type,
1511         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1512 {
1513         struct nfs_server *server = NULL;
1514         struct super_block *s;
1515         struct nfs_fh mntfh;
1516         struct nfs_parsed_mount_data data;
1517         struct dentry *mntroot;
1518         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1519         struct nfs_sb_mountdata sb_mntdata = {
1520                 .mntflags = flags,
1521         };
1522         int error;
1523
1524         security_init_mnt_opts(&data.lsm_opts);
1525
1526         /* Validate the mount data */
1527         error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1528         if (error < 0)
1529                 goto out;
1530
1531         /* Get a volume representation */
1532         server = nfs_create_server(&data, &mntfh);
1533         if (IS_ERR(server)) {
1534                 error = PTR_ERR(server);
1535                 goto out;
1536         }
1537         sb_mntdata.server = server;
1538
1539         if (server->flags & NFS_MOUNT_UNSHARED)
1540                 compare_super = NULL;
1541
1542         /* Get a superblock - note that we may end up sharing one that already exists */
1543         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1544         if (IS_ERR(s)) {
1545                 error = PTR_ERR(s);
1546                 goto out_err_nosb;
1547         }
1548
1549         if (s->s_fs_info != server) {
1550                 nfs_free_server(server);
1551                 server = NULL;
1552         }
1553
1554         if (!s->s_root) {
1555                 /* initial superblock/root creation */
1556                 nfs_fill_super(s, &data);
1557         }
1558
1559         mntroot = nfs_get_root(s, &mntfh);
1560         if (IS_ERR(mntroot)) {
1561                 error = PTR_ERR(mntroot);
1562                 goto error_splat_super;
1563         }
1564
1565         error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1566         if (error)
1567                 goto error_splat_root;
1568
1569         s->s_flags |= MS_ACTIVE;
1570         mnt->mnt_sb = s;
1571         mnt->mnt_root = mntroot;
1572         error = 0;
1573
1574 out:
1575         kfree(data.nfs_server.hostname);
1576         kfree(data.mount_server.hostname);
1577         security_free_mnt_opts(&data.lsm_opts);
1578         return error;
1579
1580 out_err_nosb:
1581         nfs_free_server(server);
1582         goto out;
1583
1584 error_splat_root:
1585         dput(mntroot);
1586 error_splat_super:
1587         up_write(&s->s_umount);
1588         deactivate_super(s);
1589         goto out;
1590 }
1591
1592 /*
1593  * Destroy an NFS2/3 superblock
1594  */
1595 static void nfs_kill_super(struct super_block *s)
1596 {
1597         struct nfs_server *server = NFS_SB(s);
1598
1599         kill_anon_super(s);
1600         nfs_free_server(server);
1601 }
1602
1603 /*
1604  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1605  */
1606 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1607                            const char *dev_name, void *raw_data,
1608                            struct vfsmount *mnt)
1609 {
1610         struct nfs_clone_mount *data = raw_data;
1611         struct super_block *s;
1612         struct nfs_server *server;
1613         struct dentry *mntroot;
1614         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1615         struct nfs_sb_mountdata sb_mntdata = {
1616                 .mntflags = flags,
1617         };
1618         int error;
1619
1620         dprintk("--> nfs_xdev_get_sb()\n");
1621
1622         /* create a new volume representation */
1623         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1624         if (IS_ERR(server)) {
1625                 error = PTR_ERR(server);
1626                 goto out_err_noserver;
1627         }
1628         sb_mntdata.server = server;
1629
1630         if (server->flags & NFS_MOUNT_UNSHARED)
1631                 compare_super = NULL;
1632
1633         /* Get a superblock - note that we may end up sharing one that already exists */
1634         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1635         if (IS_ERR(s)) {
1636                 error = PTR_ERR(s);
1637                 goto out_err_nosb;
1638         }
1639
1640         if (s->s_fs_info != server) {
1641                 nfs_free_server(server);
1642                 server = NULL;
1643         }
1644
1645         if (!s->s_root) {
1646                 /* initial superblock/root creation */
1647                 nfs_clone_super(s, data->sb);
1648         }
1649
1650         mntroot = nfs_get_root(s, data->fh);
1651         if (IS_ERR(mntroot)) {
1652                 error = PTR_ERR(mntroot);
1653                 goto error_splat_super;
1654         }
1655         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1656                 dput(mntroot);
1657                 error = -ESTALE;
1658                 goto error_splat_super;
1659         }
1660
1661         s->s_flags |= MS_ACTIVE;
1662         mnt->mnt_sb = s;
1663         mnt->mnt_root = mntroot;
1664
1665         /* clone any lsm security options from the parent to the new sb */
1666         security_sb_clone_mnt_opts(data->sb, s);
1667
1668         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1669         return 0;
1670
1671 out_err_nosb:
1672         nfs_free_server(server);
1673 out_err_noserver:
1674         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1675         return error;
1676
1677 error_splat_super:
1678         up_write(&s->s_umount);
1679         deactivate_super(s);
1680         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1681         return error;
1682 }
1683
1684 #ifdef CONFIG_NFS_V4
1685
1686 /*
1687  * Finish setting up a cloned NFS4 superblock
1688  */
1689 static void nfs4_clone_super(struct super_block *sb,
1690                             const struct super_block *old_sb)
1691 {
1692         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1693         sb->s_blocksize = old_sb->s_blocksize;
1694         sb->s_maxbytes = old_sb->s_maxbytes;
1695         sb->s_time_gran = 1;
1696         sb->s_op = old_sb->s_op;
1697         nfs_initialise_sb(sb);
1698 }
1699
1700 /*
1701  * Set up an NFS4 superblock
1702  */
1703 static void nfs4_fill_super(struct super_block *sb)
1704 {
1705         sb->s_time_gran = 1;
1706         sb->s_op = &nfs4_sops;
1707         nfs_initialise_sb(sb);
1708 }
1709
1710 /*
1711  * If the user didn't specify a port, set the port number to
1712  * the NFS version 4 default port.
1713  */
1714 static void nfs4_default_port(struct sockaddr *sap)
1715 {
1716         switch (sap->sa_family) {
1717         case AF_INET: {
1718                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
1719                 if (ap->sin_port == 0)
1720                         ap->sin_port = htons(NFS_PORT);
1721                 break;
1722         }
1723         case AF_INET6: {
1724                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
1725                 if (ap->sin6_port == 0)
1726                         ap->sin6_port = htons(NFS_PORT);
1727                 break;
1728         }
1729         }
1730 }
1731
1732 /*
1733  * Validate NFSv4 mount options
1734  */
1735 static int nfs4_validate_mount_data(void *options,
1736                                     struct nfs_parsed_mount_data *args,
1737                                     const char *dev_name)
1738 {
1739         struct sockaddr_in *ap;
1740         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1741         char *c;
1742
1743         memset(args, 0, sizeof(*args));
1744
1745         if (data == NULL)
1746                 goto out_no_data;
1747
1748         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1749         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1750         args->timeo             = 600;
1751         args->retrans           = 2;
1752         args->acregmin          = 3;
1753         args->acregmax          = 60;
1754         args->acdirmin          = 30;
1755         args->acdirmax          = 60;
1756         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1757
1758         switch (data->version) {
1759         case 1:
1760                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1761                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1762                         goto out_no_address;
1763                 if (data->host_addrlen == 0)
1764                         goto out_no_address;
1765                 args->nfs_server.addrlen = data->host_addrlen;
1766                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1767                         return -EFAULT;
1768                 if (!nfs_verify_server_address((struct sockaddr *)
1769                                                 &args->nfs_server.address))
1770                         goto out_no_address;
1771
1772                 nfs4_default_port((struct sockaddr *)
1773                                   &args->nfs_server.address);
1774
1775                 switch (data->auth_flavourlen) {
1776                 case 0:
1777                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1778                         break;
1779                 case 1:
1780                         if (copy_from_user(&args->auth_flavors[0],
1781                                            data->auth_flavours,
1782                                            sizeof(args->auth_flavors[0])))
1783                                 return -EFAULT;
1784                         break;
1785                 default:
1786                         goto out_inval_auth;
1787                 }
1788
1789                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1790                 if (IS_ERR(c))
1791                         return PTR_ERR(c);
1792                 args->nfs_server.hostname = c;
1793
1794                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1795                 if (IS_ERR(c))
1796                         return PTR_ERR(c);
1797                 args->nfs_server.export_path = c;
1798                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1799
1800                 c = strndup_user(data->client_addr.data, 16);
1801                 if (IS_ERR(c))
1802                         return PTR_ERR(c);
1803                 args->client_address = c;
1804
1805                 /*
1806                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1807                  * can deal with.
1808                  */
1809
1810                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1811                 args->rsize     = data->rsize;
1812                 args->wsize     = data->wsize;
1813                 args->timeo     = data->timeo;
1814                 args->retrans   = data->retrans;
1815                 args->acregmin  = data->acregmin;
1816                 args->acregmax  = data->acregmax;
1817                 args->acdirmin  = data->acdirmin;
1818                 args->acdirmax  = data->acdirmax;
1819                 args->nfs_server.protocol = data->proto;
1820
1821                 break;
1822         default: {
1823                 unsigned int len;
1824
1825                 if (nfs_parse_mount_options((char *)options, args) == 0)
1826                         return -EINVAL;
1827
1828                 if (!nfs_verify_server_address((struct sockaddr *)
1829                                                 &args->nfs_server.address))
1830                         return -EINVAL;
1831
1832                 nfs4_default_port((struct sockaddr *)
1833                                   &args->nfs_server.address);
1834
1835                 switch (args->auth_flavor_len) {
1836                 case 0:
1837                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1838                         break;
1839                 case 1:
1840                         break;
1841                 default:
1842                         goto out_inval_auth;
1843                 }
1844
1845                 /*
1846                  * Split "dev_name" into "hostname:mntpath".
1847                  */
1848                 c = strchr(dev_name, ':');
1849                 if (c == NULL)
1850                         return -EINVAL;
1851                 /* while calculating len, pretend ':' is '\0' */
1852                 len = c - dev_name;
1853                 if (len > NFS4_MAXNAMLEN)
1854                         return -ENAMETOOLONG;
1855                 /* N.B. caller will free nfs_server.hostname in all cases */
1856                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1857
1858                 c++;                    /* step over the ':' */
1859                 len = strlen(c);
1860                 if (len > NFS4_MAXPATHLEN)
1861                         return -ENAMETOOLONG;
1862                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1863
1864                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1865
1866                 if (args->client_address == NULL)
1867                         goto out_no_client_address;
1868
1869                 break;
1870                 }
1871         }
1872
1873         return 0;
1874
1875 out_no_data:
1876         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1877         return -EINVAL;
1878
1879 out_inval_auth:
1880         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1881                  data->auth_flavourlen);
1882         return -EINVAL;
1883
1884 out_no_address:
1885         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1886         return -EINVAL;
1887
1888 out_no_client_address:
1889         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1890         return -EINVAL;
1891 }
1892
1893 /*
1894  * Get the superblock for an NFS4 mountpoint
1895  */
1896 static int nfs4_get_sb(struct file_system_type *fs_type,
1897         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1898 {
1899         struct nfs_parsed_mount_data data;
1900         struct super_block *s;
1901         struct nfs_server *server;
1902         struct nfs_fh mntfh;
1903         struct dentry *mntroot;
1904         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1905         struct nfs_sb_mountdata sb_mntdata = {
1906                 .mntflags = flags,
1907         };
1908         int error;
1909
1910         security_init_mnt_opts(&data.lsm_opts);
1911
1912         /* Validate the mount data */
1913         error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1914         if (error < 0)
1915                 goto out;
1916
1917         /* Get a volume representation */
1918         server = nfs4_create_server(&data, &mntfh);
1919         if (IS_ERR(server)) {
1920                 error = PTR_ERR(server);
1921                 goto out;
1922         }
1923         sb_mntdata.server = server;
1924
1925         if (server->flags & NFS4_MOUNT_UNSHARED)
1926                 compare_super = NULL;
1927
1928         /* Get a superblock - note that we may end up sharing one that already exists */
1929         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1930         if (IS_ERR(s)) {
1931                 error = PTR_ERR(s);
1932                 goto out_free;
1933         }
1934
1935         if (s->s_fs_info != server) {
1936                 nfs_free_server(server);
1937                 server = NULL;
1938         }
1939
1940         if (!s->s_root) {
1941                 /* initial superblock/root creation */
1942                 nfs4_fill_super(s);
1943         }
1944
1945         mntroot = nfs4_get_root(s, &mntfh);
1946         if (IS_ERR(mntroot)) {
1947                 error = PTR_ERR(mntroot);
1948                 goto error_splat_super;
1949         }
1950
1951         s->s_flags |= MS_ACTIVE;
1952         mnt->mnt_sb = s;
1953         mnt->mnt_root = mntroot;
1954         error = 0;
1955
1956 out:
1957         kfree(data.client_address);
1958         kfree(data.nfs_server.export_path);
1959         kfree(data.nfs_server.hostname);
1960         security_free_mnt_opts(&data.lsm_opts);
1961         return error;
1962
1963 out_free:
1964         nfs_free_server(server);
1965         goto out;
1966
1967 error_splat_super:
1968         up_write(&s->s_umount);
1969         deactivate_super(s);
1970         goto out;
1971 }
1972
1973 static void nfs4_kill_super(struct super_block *sb)
1974 {
1975         struct nfs_server *server = NFS_SB(sb);
1976
1977         nfs_return_all_delegations(sb);
1978         kill_anon_super(sb);
1979
1980         nfs4_renewd_prepare_shutdown(server);
1981         nfs_free_server(server);
1982 }
1983
1984 /*
1985  * Clone an NFS4 server record on xdev traversal (FSID-change)
1986  */
1987 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1988                             const char *dev_name, void *raw_data,
1989                             struct vfsmount *mnt)
1990 {
1991         struct nfs_clone_mount *data = raw_data;
1992         struct super_block *s;
1993         struct nfs_server *server;
1994         struct dentry *mntroot;
1995         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1996         struct nfs_sb_mountdata sb_mntdata = {
1997                 .mntflags = flags,
1998         };
1999         int error;
2000
2001         dprintk("--> nfs4_xdev_get_sb()\n");
2002
2003         /* create a new volume representation */
2004         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2005         if (IS_ERR(server)) {
2006                 error = PTR_ERR(server);
2007                 goto out_err_noserver;
2008         }
2009         sb_mntdata.server = server;
2010
2011         if (server->flags & NFS4_MOUNT_UNSHARED)
2012                 compare_super = NULL;
2013
2014         /* Get a superblock - note that we may end up sharing one that already exists */
2015         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2016         if (IS_ERR(s)) {
2017                 error = PTR_ERR(s);
2018                 goto out_err_nosb;
2019         }
2020
2021         if (s->s_fs_info != server) {
2022                 nfs_free_server(server);
2023                 server = NULL;
2024         }
2025
2026         if (!s->s_root) {
2027                 /* initial superblock/root creation */
2028                 nfs4_clone_super(s, data->sb);
2029         }
2030
2031         mntroot = nfs4_get_root(s, data->fh);
2032         if (IS_ERR(mntroot)) {
2033                 error = PTR_ERR(mntroot);
2034                 goto error_splat_super;
2035         }
2036         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2037                 dput(mntroot);
2038                 error = -ESTALE;
2039                 goto error_splat_super;
2040         }
2041
2042         s->s_flags |= MS_ACTIVE;
2043         mnt->mnt_sb = s;
2044         mnt->mnt_root = mntroot;
2045
2046         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2047         return 0;
2048
2049 out_err_nosb:
2050         nfs_free_server(server);
2051 out_err_noserver:
2052         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2053         return error;
2054
2055 error_splat_super:
2056         up_write(&s->s_umount);
2057         deactivate_super(s);
2058         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2059         return error;
2060 }
2061
2062 /*
2063  * Create an NFS4 server record on referral traversal
2064  */
2065 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2066                                 const char *dev_name, void *raw_data,
2067                                 struct vfsmount *mnt)
2068 {
2069         struct nfs_clone_mount *data = raw_data;
2070         struct super_block *s;
2071         struct nfs_server *server;
2072         struct dentry *mntroot;
2073         struct nfs_fh mntfh;
2074         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2075         struct nfs_sb_mountdata sb_mntdata = {
2076                 .mntflags = flags,
2077         };
2078         int error;
2079
2080         dprintk("--> nfs4_referral_get_sb()\n");
2081
2082         /* create a new volume representation */
2083         server = nfs4_create_referral_server(data, &mntfh);
2084         if (IS_ERR(server)) {
2085                 error = PTR_ERR(server);
2086                 goto out_err_noserver;
2087         }
2088         sb_mntdata.server = server;
2089
2090         if (server->flags & NFS4_MOUNT_UNSHARED)
2091                 compare_super = NULL;
2092
2093         /* Get a superblock - note that we may end up sharing one that already exists */
2094         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2095         if (IS_ERR(s)) {
2096                 error = PTR_ERR(s);
2097                 goto out_err_nosb;
2098         }
2099
2100         if (s->s_fs_info != server) {
2101                 nfs_free_server(server);
2102                 server = NULL;
2103         }
2104
2105         if (!s->s_root) {
2106                 /* initial superblock/root creation */
2107                 nfs4_fill_super(s);
2108         }
2109
2110         mntroot = nfs4_get_root(s, &mntfh);
2111         if (IS_ERR(mntroot)) {
2112                 error = PTR_ERR(mntroot);
2113                 goto error_splat_super;
2114         }
2115         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2116                 dput(mntroot);
2117                 error = -ESTALE;
2118                 goto error_splat_super;
2119         }
2120
2121         s->s_flags |= MS_ACTIVE;
2122         mnt->mnt_sb = s;
2123         mnt->mnt_root = mntroot;
2124
2125         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2126         return 0;
2127
2128 out_err_nosb:
2129         nfs_free_server(server);
2130 out_err_noserver:
2131         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2132         return error;
2133
2134 error_splat_super:
2135         up_write(&s->s_umount);
2136         deactivate_super(s);
2137         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2138         return error;
2139 }
2140
2141 #endif /* CONFIG_NFS_V4 */