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         if (!(flags & MNT_FORCE))
 593                 return;
 594         /* -EIO all pending I/O */
 595         rpc = server->client_acl;
 596         if (!IS_ERR(rpc))
 597                 rpc_killall_tasks(rpc);
 598         rpc = server->client;
 599         if (!IS_ERR(rpc))
 600                 rpc_killall_tasks(rpc);
 601 }
 602
 603 /*
 604  * Set the port number in an address.  Be agnostic about the address family.
 605  */
 606 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
 607 {
 608         switch (sap->sa_family) {
 609         case AF_INET: {
 610                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 611                 ap->sin_port = htons(port);
 612                 break;
 613         }
 614         case AF_INET6: {
 615                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 616                 ap->sin6_port = htons(port);
 617                 break;
 618         }
 619         }
 620 }
 621
 622 /*
 623  * Sanity-check a server address provided by the mount command.
 624  *
 625  * Address family must be initialized, and address must not be
 626  * the ANY address for that family.
 627  */
 628 static int nfs_verify_server_address(struct sockaddr *addr)
 629 {
 630         switch (addr->sa_family) {
 631         case AF_INET: {
 632                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 633                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
 634         }
 635         case AF_INET6: {
 636                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 637                 return !ipv6_addr_any(sa);
 638         }
 639         }
 640
 641         return 0;
 642 }
 643
 644 /*
 645  * Parse string addresses passed in via a mount option,
 646  * and construct a sockaddr based on the result.
 647  *
 648  * If address parsing fails, set the sockaddr's address
 649  * family to AF_UNSPEC to force nfs_verify_server_address()
 650  * to punt the mount.
 651  */
 652 static void nfs_parse_server_address(char *value,
 653                                      struct sockaddr *sap,
 654                                      size_t *len)
 655 {
 656         if (strchr(value, ':')) {
 657                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
 658                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
 659
 660                 ap->sin6_family = AF_INET6;
 661                 *len = sizeof(*ap);
 662                 if (in6_pton(value, -1, addr, '\0', NULL))
 663                         return;
 664         } else {
 665                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 666                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
 667
 668                 ap->sin_family = AF_INET;
 669                 *len = sizeof(*ap);
 670                 if (in4_pton(value, -1, addr, '\0', NULL))
 671                         return;
 672         }
 673
 674         sap->sa_family = AF_UNSPEC;
 675         *len = 0;
 676 }
 677
 678 /*
 679  * Error-check and convert a string of mount options from user space into
 680  * a data structure
 681  */
 682 static int nfs_parse_mount_options(char *raw,
 683                                    struct nfs_parsed_mount_data *mnt)
 684 {
 685         char *p, *string, *secdata;
 686         unsigned short port = 0;
 687         int rc;
 688
 689         if (!raw) {
 690                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
 691                 return 1;
 692         }
 693         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 694
 695         secdata = alloc_secdata();
 696         if (!secdata)
 697                 goto out_nomem;
 698
 699         rc = security_sb_copy_data(raw, secdata);
 700         if (rc)
 701                 goto out_security_failure;
 702
 703         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
 704         if (rc)
 705                 goto out_security_failure;
 706
 707         free_secdata(secdata);
 708
 709         while ((p = strsep(&raw, ",")) != NULL) {
 710                 substring_t args[MAX_OPT_ARGS];
 711                 int option, token;
 712
 713                 if (!*p)
 714                         continue;
 715
 716                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
 717
 718                 token = match_token(p, nfs_mount_option_tokens, args);
 719                 switch (token) {
 720                 case Opt_soft:
 721                         mnt->flags |= NFS_MOUNT_SOFT;
 722                         break;
 723                 case Opt_hard:
 724                         mnt->flags &= ~NFS_MOUNT_SOFT;
 725                         break;
 726                 case Opt_intr:
 727                 case Opt_nointr:
 728                         break;
 729                 case Opt_posix:
 730                         mnt->flags |= NFS_MOUNT_POSIX;
 731                         break;
 732                 case Opt_noposix:
 733                         mnt->flags &= ~NFS_MOUNT_POSIX;
 734                         break;
 735                 case Opt_cto:
 736                         mnt->flags &= ~NFS_MOUNT_NOCTO;
 737                         break;
 738                 case Opt_nocto:
 739                         mnt->flags |= NFS_MOUNT_NOCTO;
 740                         break;
 741                 case Opt_ac:
 742                         mnt->flags &= ~NFS_MOUNT_NOAC;
 743                         break;
 744                 case Opt_noac:
 745                         mnt->flags |= NFS_MOUNT_NOAC;
 746                         break;
 747                 case Opt_lock:
 748                         mnt->flags &= ~NFS_MOUNT_NONLM;
 749                         break;
 750                 case Opt_nolock:
 751                         mnt->flags |= NFS_MOUNT_NONLM;
 752                         break;
 753                 case Opt_v2:
 754                         mnt->flags &= ~NFS_MOUNT_VER3;
 755                         break;
 756                 case Opt_v3:
 757                         mnt->flags |= NFS_MOUNT_VER3;
 758                         break;
 759                 case Opt_udp:
 760                         mnt->flags &= ~NFS_MOUNT_TCP;
 761                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 762                         mnt->timeo = 7;
 763                         mnt->retrans = 5;
 764                         break;
 765                 case Opt_tcp:
 766                         mnt->flags |= NFS_MOUNT_TCP;
 767                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 768                         mnt->timeo = 600;
 769                         mnt->retrans = 2;
 770                         break;
 771                 case Opt_rdma:
 772                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 773                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 774                         mnt->timeo = 600;
 775                         mnt->retrans = 2;
 776                         break;
 777                 case Opt_acl:
 778                         mnt->flags &= ~NFS_MOUNT_NOACL;
 779                         break;
 780                 case Opt_noacl:
 781                         mnt->flags |= NFS_MOUNT_NOACL;
 782                         break;
 783                 case Opt_rdirplus:
 784                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
 785                         break;
 786                 case Opt_nordirplus:
 787                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
 788                         break;
 789                 case Opt_sharecache:
 790                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
 791                         break;
 792                 case Opt_nosharecache:
 793                         mnt->flags |= NFS_MOUNT_UNSHARED;
 794                         break;
 795
 796                 case Opt_port:
 797                         if (match_int(args, &option))
 798                                 return 0;
 799                         if (option < 0 || option > 65535)
 800                                 return 0;
 801                         port = option;
 802                         break;
 803                 case Opt_rsize:
 804                         if (match_int(args, &mnt->rsize))
 805                                 return 0;
 806                         break;
 807                 case Opt_wsize:
 808                         if (match_int(args, &mnt->wsize))
 809                                 return 0;
 810                         break;
 811                 case Opt_bsize:
 812                         if (match_int(args, &option))
 813                                 return 0;
 814                         if (option < 0)
 815                                 return 0;
 816                         mnt->bsize = option;
 817                         break;
 818                 case Opt_timeo:
 819                         if (match_int(args, &mnt->timeo))
 820                                 return 0;
 821                         break;
 822                 case Opt_retrans:
 823                         if (match_int(args, &mnt->retrans))
 824                                 return 0;
 825                         break;
 826                 case Opt_acregmin:
 827                         if (match_int(args, &mnt->acregmin))
 828                                 return 0;
 829                         break;
 830                 case Opt_acregmax:
 831                         if (match_int(args, &mnt->acregmax))
 832                                 return 0;
 833                         break;
 834                 case Opt_acdirmin:
 835                         if (match_int(args, &mnt->acdirmin))
 836                                 return 0;
 837                         break;
 838                 case Opt_acdirmax:
 839                         if (match_int(args, &mnt->acdirmax))
 840                                 return 0;
 841                         break;
 842                 case Opt_actimeo:
 843                         if (match_int(args, &option))
 844                                 return 0;
 845                         if (option < 0)
 846                                 return 0;
 847                         mnt->acregmin =
 848                         mnt->acregmax =
 849                         mnt->acdirmin =
 850                         mnt->acdirmax = option;
 851                         break;
 852                 case Opt_namelen:
 853                         if (match_int(args, &mnt->namlen))
 854                                 return 0;
 855                         break;
 856                 case Opt_mountport:
 857                         if (match_int(args, &option))
 858                                 return 0;
 859                         if (option < 0 || option > 65535)
 860                                 return 0;
 861                         mnt->mount_server.port = option;
 862                         break;
 863                 case Opt_mountvers:
 864                         if (match_int(args, &option))
 865                                 return 0;
 866                         if (option < 0)
 867                                 return 0;
 868                         mnt->mount_server.version = option;
 869                         break;
 870                 case Opt_nfsvers:
 871                         if (match_int(args, &option))
 872                                 return 0;
 873                         switch (option) {
 874                         case 2:
 875                                 mnt->flags &= ~NFS_MOUNT_VER3;
 876                                 break;
 877                         case 3:
 878                                 mnt->flags |= NFS_MOUNT_VER3;
 879                                 break;
 880                         default:
 881                                 goto out_unrec_vers;
 882                         }
 883                         break;
 884
 885                 case Opt_sec:
 886                         string = match_strdup(args);
 887                         if (string == NULL)
 888                                 goto out_nomem;
 889                         token = match_token(string, nfs_secflavor_tokens, args);
 890                         kfree(string);
 891
 892                         /*
 893                          * The flags setting is for v2/v3.  The flavor_len
 894                          * setting is for v4.  v2/v3 also need to know the
 895                          * difference between NULL and UNIX.
 896                          */
 897                         switch (token) {
 898                         case Opt_sec_none:
 899                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 900                                 mnt->auth_flavor_len = 0;
 901                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
 902                                 break;
 903                         case Opt_sec_sys:
 904                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
 905                                 mnt->auth_flavor_len = 0;
 906                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
 907                                 break;
 908                         case Opt_sec_krb5:
 909                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 910                                 mnt->auth_flavor_len = 1;
 911                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
 912                                 break;
 913                         case Opt_sec_krb5i:
 914                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 915                                 mnt->auth_flavor_len = 1;
 916                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
 917                                 break;
 918                         case Opt_sec_krb5p:
 919                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 920                                 mnt->auth_flavor_len = 1;
 921                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
 922                                 break;
 923                         case Opt_sec_lkey:
 924                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 925                                 mnt->auth_flavor_len = 1;
 926                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
 927                                 break;
 928                         case Opt_sec_lkeyi:
 929                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 930                                 mnt->auth_flavor_len = 1;
 931                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
 932                                 break;
 933                         case Opt_sec_lkeyp:
 934                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 935                                 mnt->auth_flavor_len = 1;
 936                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
 937                                 break;
 938                         case Opt_sec_spkm:
 939                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 940                                 mnt->auth_flavor_len = 1;
 941                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
 942                                 break;
 943                         case Opt_sec_spkmi:
 944                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 945                                 mnt->auth_flavor_len = 1;
 946                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
 947                                 break;
 948                         case Opt_sec_spkmp:
 949                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 950                                 mnt->auth_flavor_len = 1;
 951                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
 952                                 break;
 953                         default:
 954                                 goto out_unrec_sec;
 955                         }
 956                         break;
 957                 case Opt_proto:
 958                         string = match_strdup(args);
 959                         if (string == NULL)
 960                                 goto out_nomem;
 961                         token = match_token(string,
 962                                             nfs_xprt_protocol_tokens, args);
 963                         kfree(string);
 964
 965                         switch (token) {
 966                         case Opt_xprt_udp:
 967                                 mnt->flags &= ~NFS_MOUNT_TCP;
 968                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 969                                 mnt->timeo = 7;
 970                                 mnt->retrans = 5;
 971                                 break;
 972                         case Opt_xprt_tcp:
 973                                 mnt->flags |= NFS_MOUNT_TCP;
 974                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 975                                 mnt->timeo = 600;
 976                                 mnt->retrans = 2;
 977                                 break;
 978                         case Opt_xprt_rdma:
 979                                 /* vector side protocols to TCP */
 980                                 mnt->flags |= NFS_MOUNT_TCP;
 981                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 982                                 mnt->timeo = 600;
 983                                 mnt->retrans = 2;
 984                                 break;
 985                         default:
 986                                 goto out_unrec_xprt;
 987                         }
 988                         break;
 989                 case Opt_mountproto:
 990                         string = match_strdup(args);
 991                         if (string == NULL)
 992                                 goto out_nomem;
 993                         token = match_token(string,
 994                                             nfs_xprt_protocol_tokens, args);
 995                         kfree(string);
 996
 997                         switch (token) {
 998                         case Opt_xprt_udp:
 999                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1000                                 break;
1001                         case Opt_xprt_tcp:
1002                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1003                                 break;
1004                         case Opt_xprt_rdma: /* not used for side protocols */
1005                         default:
1006                                 goto out_unrec_xprt;
1007                         }
1008                         break;
1009                 case Opt_addr:
1010                         string = match_strdup(args);
1011                         if (string == NULL)
1012                                 goto out_nomem;
1013                         nfs_parse_server_address(string, (struct sockaddr *)
1014                                                  &mnt->nfs_server.address,
1015                                                  &mnt->nfs_server.addrlen);
1016                         kfree(string);
1017                         break;
1018                 case Opt_clientaddr:
1019                         string = match_strdup(args);
1020                         if (string == NULL)
1021                                 goto out_nomem;
1022                         kfree(mnt->client_address);
1023                         mnt->client_address = string;
1024                         break;
1025                 case Opt_mounthost:
1026                         string = match_strdup(args);
1027                         if (string == NULL)
1028                                 goto out_nomem;
1029                         kfree(mnt->mount_server.hostname);
1030                         mnt->mount_server.hostname = string;
1031                         break;
1032                 case Opt_mountaddr:
1033                         string = match_strdup(args);
1034                         if (string == NULL)
1035                                 goto out_nomem;
1036                         nfs_parse_server_address(string, (struct sockaddr *)
1037                                                  &mnt->mount_server.address,
1038                                                  &mnt->mount_server.addrlen);
1039                         kfree(string);
1040                         break;
1041
1042                 case Opt_userspace:
1043                 case Opt_deprecated:
1044                         break;
1045
1046                 default:
1047                         goto out_unknown;
1048                 }
1049         }
1050
1051         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port);
1052
1053         return 1;
1054
1055 out_nomem:
1056         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1057         return 0;
1058 out_security_failure:
1059         free_secdata(secdata);
1060         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1061         return 0;
1062 out_unrec_vers:
1063         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1064         return 0;
1065
1066 out_unrec_xprt:
1067         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1068         return 0;
1069
1070 out_unrec_sec:
1071         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1072         return 0;
1073
1074 out_unknown:
1075         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1076         return 0;
1077 }
1078
1079 /*
1080  * Use the remote server's MOUNT service to request the NFS file handle
1081  * corresponding to the provided path.
1082  */
1083 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1084                          struct nfs_fh *root_fh)
1085 {
1086         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1087         char *hostname;
1088         int status;
1089
1090         if (args->mount_server.version == 0) {
1091                 if (args->flags & NFS_MOUNT_VER3)
1092                         args->mount_server.version = NFS_MNT3_VERSION;
1093                 else
1094                         args->mount_server.version = NFS_MNT_VERSION;
1095         }
1096
1097         if (args->mount_server.hostname)
1098                 hostname = args->mount_server.hostname;
1099         else
1100                 hostname = args->nfs_server.hostname;
1101
1102         /*
1103          * Construct the mount server's address.
1104          */
1105         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1106                 memcpy(sap, &args->nfs_server.address,
1107                        args->nfs_server.addrlen);
1108                 args->mount_server.addrlen = args->nfs_server.addrlen;
1109         }
1110
1111         /*
1112          * autobind will be used if mount_server.port == 0
1113          */
1114         nfs_set_port(sap, args->mount_server.port);
1115
1116         /*
1117          * Now ask the mount server to map our export path
1118          * to a file handle.
1119          */
1120         status = nfs_mount(sap,
1121                            args->mount_server.addrlen,
1122                            hostname,
1123                            args->nfs_server.export_path,
1124                            args->mount_server.version,
1125                            args->mount_server.protocol,
1126                            root_fh);
1127         if (status == 0)
1128                 return 0;
1129
1130         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1131                         hostname, status);
1132         return status;
1133 }
1134
1135 /*
1136  * Validate the NFS2/NFS3 mount data
1137  * - fills in the mount root filehandle
1138  *
1139  * For option strings, user space handles the following behaviors:
1140  *
1141  * + DNS: mapping server host name to IP address ("addr=" option)
1142  *
1143  * + failure mode: how to behave if a mount request can't be handled
1144  *   immediately ("fg/bg" option)
1145  *
1146  * + retry: how often to retry a mount request ("retry=" option)
1147  *
1148  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1149  *   mountproto=tcp after mountproto=udp, and so on
1150  */
1151 static int nfs_validate_mount_data(void *options,
1152                                    struct nfs_parsed_mount_data *args,
1153                                    struct nfs_fh *mntfh,
1154                                    const char *dev_name)
1155 {
1156         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1157
1158         memset(args, 0, sizeof(*args));
1159
1160         if (data == NULL)
1161                 goto out_no_data;
1162
1163         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1164         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1165         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1166         args->timeo             = 600;
1167         args->retrans           = 2;
1168         args->acregmin          = 3;
1169         args->acregmax          = 60;
1170         args->acdirmin          = 30;
1171         args->acdirmax          = 60;
1172         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1173         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1174
1175         switch (data->version) {
1176         case 1:
1177                 data->namlen = 0;
1178         case 2:
1179                 data->bsize = 0;
1180         case 3:
1181                 if (data->flags & NFS_MOUNT_VER3)
1182                         goto out_no_v3;
1183                 data->root.size = NFS2_FHSIZE;
1184                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1185         case 4:
1186                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1187                         goto out_no_sec;
1188         case 5:
1189                 memset(data->context, 0, sizeof(data->context));
1190         case 6:
1191                 if (data->flags & NFS_MOUNT_VER3)
1192                         mntfh->size = data->root.size;
1193                 else
1194                         mntfh->size = NFS2_FHSIZE;
1195
1196                 if (mntfh->size > sizeof(mntfh->data))
1197                         goto out_invalid_fh;
1198
1199                 memcpy(mntfh->data, data->root.data, mntfh->size);
1200                 if (mntfh->size < sizeof(mntfh->data))
1201                         memset(mntfh->data + mntfh->size, 0,
1202                                sizeof(mntfh->data) - mntfh->size);
1203
1204                 /*
1205                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1206                  * can deal with.
1207                  */
1208                 args->flags             = data->flags;
1209                 args->rsize             = data->rsize;
1210                 args->wsize             = data->wsize;
1211                 args->flags             = data->flags;
1212                 args->timeo             = data->timeo;
1213                 args->retrans           = data->retrans;
1214                 args->acregmin          = data->acregmin;
1215                 args->acregmax          = data->acregmax;
1216                 args->acdirmin          = data->acdirmin;
1217                 args->acdirmax          = data->acdirmax;
1218
1219                 memcpy(&args->nfs_server.address, &data->addr,
1220                        sizeof(data->addr));
1221                 args->nfs_server.addrlen = sizeof(data->addr);
1222                 if (!nfs_verify_server_address((struct sockaddr *)
1223                                                 &args->nfs_server.address))
1224                         goto out_no_address;
1225
1226                 if (!(data->flags & NFS_MOUNT_TCP))
1227                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1228                 /* N.B. caller will free nfs_server.hostname in all cases */
1229                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1230                 args->namlen            = data->namlen;
1231                 args->bsize             = data->bsize;
1232                 args->auth_flavors[0]   = data->pseudoflavor;
1233
1234                 /*
1235                  * The legacy version 6 binary mount data from userspace has a
1236                  * field used only to transport selinux information into the
1237                  * the kernel.  To continue to support that functionality we
1238                  * have a touch of selinux knowledge here in the NFS code. The
1239                  * userspace code converted context=blah to just blah so we are
1240                  * converting back to the full string selinux understands.
1241                  */
1242                 if (data->context[0]){
1243 #ifdef CONFIG_SECURITY_SELINUX
1244                         int rc;
1245                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1246                         if (!opts_str)
1247                                 return -ENOMEM;
1248                         strcpy(opts_str, "context=");
1249                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1250                         strcat(opts_str, &data->context[0]);
1251                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1252                         kfree(opts_str);
1253                         if (rc)
1254                                 return rc;
1255 #else
1256                         return -EINVAL;
1257 #endif
1258                 }
1259
1260                 break;
1261         default: {
1262                 unsigned int len;
1263                 char *c;
1264                 int status;
1265
1266                 if (nfs_parse_mount_options((char *)options, args) == 0)
1267                         return -EINVAL;
1268
1269                 if (!nfs_verify_server_address((struct sockaddr *)
1270                                                 &args->nfs_server.address))
1271                         goto out_no_address;
1272
1273                 c = strchr(dev_name, ':');
1274                 if (c == NULL)
1275                         return -EINVAL;
1276                 len = c - dev_name;
1277                 /* N.B. caller will free nfs_server.hostname in all cases */
1278                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1279
1280                 c++;
1281                 if (strlen(c) > NFS_MAXPATHLEN)
1282                         return -ENAMETOOLONG;
1283                 args->nfs_server.export_path = c;
1284
1285                 status = nfs_try_mount(args, mntfh);
1286                 if (status)
1287                         return status;
1288
1289                 break;
1290                 }
1291         }
1292
1293         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1294                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1295
1296 #ifndef CONFIG_NFS_V3
1297         if (args->flags & NFS_MOUNT_VER3)
1298                 goto out_v3_not_compiled;
1299 #endif /* !CONFIG_NFS_V3 */
1300
1301         return 0;
1302
1303 out_no_data:
1304         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1305         return -EINVAL;
1306
1307 out_no_v3:
1308         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1309                  data->version);
1310         return -EINVAL;
1311
1312 out_no_sec:
1313         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1314         return -EINVAL;
1315
1316 #ifndef CONFIG_NFS_V3
1317 out_v3_not_compiled:
1318         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1319         return -EPROTONOSUPPORT;
1320 #endif /* !CONFIG_NFS_V3 */
1321
1322 out_no_address:
1323         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1324         return -EINVAL;
1325
1326 out_invalid_fh:
1327         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1328         return -EINVAL;
1329 }
1330
1331 /*
1332  * Initialise the common bits of the superblock
1333  */
1334 static inline void nfs_initialise_sb(struct super_block *sb)
1335 {
1336         struct nfs_server *server = NFS_SB(sb);
1337
1338         sb->s_magic = NFS_SUPER_MAGIC;
1339
1340         /* We probably want something more informative here */
1341         snprintf(sb->s_id, sizeof(sb->s_id),
1342                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1343
1344         if (sb->s_blocksize == 0)
1345                 sb->s_blocksize = nfs_block_bits(server->wsize,
1346                                                  &sb->s_blocksize_bits);
1347
1348         if (server->flags & NFS_MOUNT_NOAC)
1349                 sb->s_flags |= MS_SYNCHRONOUS;
1350
1351         nfs_super_set_maxbytes(sb, server->maxfilesize);
1352 }
1353
1354 /*
1355  * Finish setting up an NFS2/3 superblock
1356  */
1357 static void nfs_fill_super(struct super_block *sb,
1358                            struct nfs_parsed_mount_data *data)
1359 {
1360         struct nfs_server *server = NFS_SB(sb);
1361
1362         sb->s_blocksize_bits = 0;
1363         sb->s_blocksize = 0;
1364         if (data->bsize)
1365                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1366
1367         if (server->flags & NFS_MOUNT_VER3) {
1368                 /* The VFS shouldn't apply the umask to mode bits. We will do
1369                  * so ourselves when necessary.
1370                  */
1371                 sb->s_flags |= MS_POSIXACL;
1372                 sb->s_time_gran = 1;
1373         }
1374
1375         sb->s_op = &nfs_sops;
1376         nfs_initialise_sb(sb);
1377 }
1378
1379 /*
1380  * Finish setting up a cloned NFS2/3 superblock
1381  */
1382 static void nfs_clone_super(struct super_block *sb,
1383                             const struct super_block *old_sb)
1384 {
1385         struct nfs_server *server = NFS_SB(sb);
1386
1387         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1388         sb->s_blocksize = old_sb->s_blocksize;
1389         sb->s_maxbytes = old_sb->s_maxbytes;
1390
1391         if (server->flags & NFS_MOUNT_VER3) {
1392                 /* The VFS shouldn't apply the umask to mode bits. We will do
1393                  * so ourselves when necessary.
1394                  */
1395                 sb->s_flags |= MS_POSIXACL;
1396                 sb->s_time_gran = 1;
1397         }
1398
1399         sb->s_op = old_sb->s_op;
1400         nfs_initialise_sb(sb);
1401 }
1402
1403 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1404
1405 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1406 {
1407         const struct nfs_server *a = s->s_fs_info;
1408         const struct rpc_clnt *clnt_a = a->client;
1409         const struct rpc_clnt *clnt_b = b->client;
1410
1411         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1412                 goto Ebusy;
1413         if (a->nfs_client != b->nfs_client)
1414                 goto Ebusy;
1415         if (a->flags != b->flags)
1416                 goto Ebusy;
1417         if (a->wsize != b->wsize)
1418                 goto Ebusy;
1419         if (a->rsize != b->rsize)
1420                 goto Ebusy;
1421         if (a->acregmin != b->acregmin)
1422                 goto Ebusy;
1423         if (a->acregmax != b->acregmax)
1424                 goto Ebusy;
1425         if (a->acdirmin != b->acdirmin)
1426                 goto Ebusy;
1427         if (a->acdirmax != b->acdirmax)
1428                 goto Ebusy;
1429         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1430                 goto Ebusy;
1431         return 1;
1432 Ebusy:
1433         return 0;
1434 }
1435
1436 struct nfs_sb_mountdata {
1437         struct nfs_server *server;
1438         int mntflags;
1439 };
1440
1441 static int nfs_set_super(struct super_block *s, void *data)
1442 {
1443         struct nfs_sb_mountdata *sb_mntdata = data;
1444         struct nfs_server *server = sb_mntdata->server;
1445         int ret;
1446
1447         s->s_flags = sb_mntdata->mntflags;
1448         s->s_fs_info = server;
1449         ret = set_anon_super(s, server);
1450         if (ret == 0)
1451                 server->s_dev = s->s_dev;
1452         return ret;
1453 }
1454
1455 static int nfs_compare_super_address(struct nfs_server *server1,
1456                                      struct nfs_server *server2)
1457 {
1458         struct sockaddr *sap1, *sap2;
1459
1460         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1461         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1462
1463         if (sap1->sa_family != sap2->sa_family)
1464                 return 0;
1465
1466         switch (sap1->sa_family) {
1467         case AF_INET: {
1468                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1469                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1470                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1471                         return 0;
1472                 if (sin1->sin_port != sin2->sin_port)
1473                         return 0;
1474                 break;
1475         }
1476         case AF_INET6: {
1477                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1478                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1479                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1480                         return 0;
1481                 if (sin1->sin6_port != sin2->sin6_port)
1482                         return 0;
1483                 break;
1484         }
1485         default:
1486                 return 0;
1487         }
1488
1489         return 1;
1490 }
1491
1492 static int nfs_compare_super(struct super_block *sb, void *data)
1493 {
1494         struct nfs_sb_mountdata *sb_mntdata = data;
1495         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1496         int mntflags = sb_mntdata->mntflags;
1497
1498         if (!nfs_compare_super_address(old, server))
1499                 return 0;
1500         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1501         if (old->flags & NFS_MOUNT_UNSHARED)
1502                 return 0;
1503         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1504                 return 0;
1505         return nfs_compare_mount_options(sb, server, mntflags);
1506 }
1507
1508 static int nfs_get_sb(struct file_system_type *fs_type,
1509         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1510 {
1511         struct nfs_server *server = NULL;
1512         struct super_block *s;
1513         struct nfs_fh mntfh;
1514         struct nfs_parsed_mount_data data;
1515         struct dentry *mntroot;
1516         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1517         struct nfs_sb_mountdata sb_mntdata = {
1518                 .mntflags = flags,
1519         };
1520         int error;
1521
1522         security_init_mnt_opts(&data.lsm_opts);
1523
1524         /* Validate the mount data */
1525         error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1526         if (error < 0)
1527                 goto out;
1528
1529         /* Get a volume representation */
1530         server = nfs_create_server(&data, &mntfh);
1531         if (IS_ERR(server)) {
1532                 error = PTR_ERR(server);
1533                 goto out;
1534         }
1535         sb_mntdata.server = server;
1536
1537         if (server->flags & NFS_MOUNT_UNSHARED)
1538                 compare_super = NULL;
1539
1540         /* Get a superblock - note that we may end up sharing one that already exists */
1541         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1542         if (IS_ERR(s)) {
1543                 error = PTR_ERR(s);
1544                 goto out_err_nosb;
1545         }
1546
1547         if (s->s_fs_info != server) {
1548                 nfs_free_server(server);
1549                 server = NULL;
1550         }
1551
1552         if (!s->s_root) {
1553                 /* initial superblock/root creation */
1554                 nfs_fill_super(s, &data);
1555         }
1556
1557         mntroot = nfs_get_root(s, &mntfh);
1558         if (IS_ERR(mntroot)) {
1559                 error = PTR_ERR(mntroot);
1560                 goto error_splat_super;
1561         }
1562
1563         error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1564         if (error)
1565                 goto error_splat_root;
1566
1567         s->s_flags |= MS_ACTIVE;
1568         mnt->mnt_sb = s;
1569         mnt->mnt_root = mntroot;
1570         error = 0;
1571
1572 out:
1573         kfree(data.nfs_server.hostname);
1574         kfree(data.mount_server.hostname);
1575         security_free_mnt_opts(&data.lsm_opts);
1576         return error;
1577
1578 out_err_nosb:
1579         nfs_free_server(server);
1580         goto out;
1581
1582 error_splat_root:
1583         dput(mntroot);
1584 error_splat_super:
1585         up_write(&s->s_umount);
1586         deactivate_super(s);
1587         goto out;
1588 }
1589
1590 /*
1591  * Destroy an NFS2/3 superblock
1592  */
1593 static void nfs_kill_super(struct super_block *s)
1594 {
1595         struct nfs_server *server = NFS_SB(s);
1596
1597         kill_anon_super(s);
1598         nfs_free_server(server);
1599 }
1600
1601 /*
1602  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1603  */
1604 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1605                            const char *dev_name, void *raw_data,
1606                            struct vfsmount *mnt)
1607 {
1608         struct nfs_clone_mount *data = raw_data;
1609         struct super_block *s;
1610         struct nfs_server *server;
1611         struct dentry *mntroot;
1612         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1613         struct nfs_sb_mountdata sb_mntdata = {
1614                 .mntflags = flags,
1615         };
1616         int error;
1617
1618         dprintk("--> nfs_xdev_get_sb()\n");
1619
1620         /* create a new volume representation */
1621         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1622         if (IS_ERR(server)) {
1623                 error = PTR_ERR(server);
1624                 goto out_err_noserver;
1625         }
1626         sb_mntdata.server = server;
1627
1628         if (server->flags & NFS_MOUNT_UNSHARED)
1629                 compare_super = NULL;
1630
1631         /* Get a superblock - note that we may end up sharing one that already exists */
1632         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1633         if (IS_ERR(s)) {
1634                 error = PTR_ERR(s);
1635                 goto out_err_nosb;
1636         }
1637
1638         if (s->s_fs_info != server) {
1639                 nfs_free_server(server);
1640                 server = NULL;
1641         }
1642
1643         if (!s->s_root) {
1644                 /* initial superblock/root creation */
1645                 nfs_clone_super(s, data->sb);
1646         }
1647
1648         mntroot = nfs_get_root(s, data->fh);
1649         if (IS_ERR(mntroot)) {
1650                 error = PTR_ERR(mntroot);
1651                 goto error_splat_super;
1652         }
1653         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1654                 dput(mntroot);
1655                 error = -ESTALE;
1656                 goto error_splat_super;
1657         }
1658
1659         s->s_flags |= MS_ACTIVE;
1660         mnt->mnt_sb = s;
1661         mnt->mnt_root = mntroot;
1662
1663         /* clone any lsm security options from the parent to the new sb */
1664         security_sb_clone_mnt_opts(data->sb, s);
1665
1666         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1667         return 0;
1668
1669 out_err_nosb:
1670         nfs_free_server(server);
1671 out_err_noserver:
1672         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1673         return error;
1674
1675 error_splat_super:
1676         up_write(&s->s_umount);
1677         deactivate_super(s);
1678         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1679         return error;
1680 }
1681
1682 #ifdef CONFIG_NFS_V4
1683
1684 /*
1685  * Finish setting up a cloned NFS4 superblock
1686  */
1687 static void nfs4_clone_super(struct super_block *sb,
1688                             const struct super_block *old_sb)
1689 {
1690         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1691         sb->s_blocksize = old_sb->s_blocksize;
1692         sb->s_maxbytes = old_sb->s_maxbytes;
1693         sb->s_time_gran = 1;
1694         sb->s_op = old_sb->s_op;
1695         nfs_initialise_sb(sb);
1696 }
1697
1698 /*
1699  * Set up an NFS4 superblock
1700  */
1701 static void nfs4_fill_super(struct super_block *sb)
1702 {
1703         sb->s_time_gran = 1;
1704         sb->s_op = &nfs4_sops;
1705         nfs_initialise_sb(sb);
1706 }
1707
1708 /*
1709  * If the user didn't specify a port, set the port number to
1710  * the NFS version 4 default port.
1711  */
1712 static void nfs4_default_port(struct sockaddr *sap)
1713 {
1714         switch (sap->sa_family) {
1715         case AF_INET: {
1716                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
1717                 if (ap->sin_port == 0)
1718                         ap->sin_port = htons(NFS_PORT);
1719                 break;
1720         }
1721         case AF_INET6: {
1722                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
1723                 if (ap->sin6_port == 0)
1724                         ap->sin6_port = htons(NFS_PORT);
1725                 break;
1726         }
1727         }
1728 }
1729
1730 /*
1731  * Validate NFSv4 mount options
1732  */
1733 static int nfs4_validate_mount_data(void *options,
1734                                     struct nfs_parsed_mount_data *args,
1735                                     const char *dev_name)
1736 {
1737         struct sockaddr_in *ap;
1738         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1739         char *c;
1740
1741         memset(args, 0, sizeof(*args));
1742
1743         if (data == NULL)
1744                 goto out_no_data;
1745
1746         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1747         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1748         args->timeo             = 600;
1749         args->retrans           = 2;
1750         args->acregmin          = 3;
1751         args->acregmax          = 60;
1752         args->acdirmin          = 30;
1753         args->acdirmax          = 60;
1754         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1755
1756         switch (data->version) {
1757         case 1:
1758                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1759                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1760                         goto out_no_address;
1761                 if (data->host_addrlen == 0)
1762                         goto out_no_address;
1763                 args->nfs_server.addrlen = data->host_addrlen;
1764                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1765                         return -EFAULT;
1766                 if (!nfs_verify_server_address((struct sockaddr *)
1767                                                 &args->nfs_server.address))
1768                         goto out_no_address;
1769
1770                 nfs4_default_port((struct sockaddr *)
1771                                   &args->nfs_server.address);
1772
1773                 switch (data->auth_flavourlen) {
1774                 case 0:
1775                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1776                         break;
1777                 case 1:
1778                         if (copy_from_user(&args->auth_flavors[0],
1779                                            data->auth_flavours,
1780                                            sizeof(args->auth_flavors[0])))
1781                                 return -EFAULT;
1782                         break;
1783                 default:
1784                         goto out_inval_auth;
1785                 }
1786
1787                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1788                 if (IS_ERR(c))
1789                         return PTR_ERR(c);
1790                 args->nfs_server.hostname = c;
1791
1792                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1793                 if (IS_ERR(c))
1794                         return PTR_ERR(c);
1795                 args->nfs_server.export_path = c;
1796                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1797
1798                 c = strndup_user(data->client_addr.data, 16);
1799                 if (IS_ERR(c))
1800                         return PTR_ERR(c);
1801                 args->client_address = c;
1802
1803                 /*
1804                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1805                  * can deal with.
1806                  */
1807
1808                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1809                 args->rsize     = data->rsize;
1810                 args->wsize     = data->wsize;
1811                 args->timeo     = data->timeo;
1812                 args->retrans   = data->retrans;
1813                 args->acregmin  = data->acregmin;
1814                 args->acregmax  = data->acregmax;
1815                 args->acdirmin  = data->acdirmin;
1816                 args->acdirmax  = data->acdirmax;
1817                 args->nfs_server.protocol = data->proto;
1818
1819                 break;
1820         default: {
1821                 unsigned int len;
1822
1823                 if (nfs_parse_mount_options((char *)options, args) == 0)
1824                         return -EINVAL;
1825
1826                 if (!nfs_verify_server_address((struct sockaddr *)
1827                                                 &args->nfs_server.address))
1828                         return -EINVAL;
1829
1830                 nfs4_default_port((struct sockaddr *)
1831                                   &args->nfs_server.address);
1832
1833                 switch (args->auth_flavor_len) {
1834                 case 0:
1835                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1836                         break;
1837                 case 1:
1838                         break;
1839                 default:
1840                         goto out_inval_auth;
1841                 }
1842
1843                 /*
1844                  * Split "dev_name" into "hostname:mntpath".
1845                  */
1846                 c = strchr(dev_name, ':');
1847                 if (c == NULL)
1848                         return -EINVAL;
1849                 /* while calculating len, pretend ':' is '\0' */
1850                 len = c - dev_name;
1851                 if (len > NFS4_MAXNAMLEN)
1852                         return -ENAMETOOLONG;
1853                 /* N.B. caller will free nfs_server.hostname in all cases */
1854                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1855
1856                 c++;                    /* step over the ':' */
1857                 len = strlen(c);
1858                 if (len > NFS4_MAXPATHLEN)
1859                         return -ENAMETOOLONG;
1860                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1861
1862                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1863
1864                 if (args->client_address == NULL)
1865                         goto out_no_client_address;
1866
1867                 break;
1868                 }
1869         }
1870
1871         return 0;
1872
1873 out_no_data:
1874         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1875         return -EINVAL;
1876
1877 out_inval_auth:
1878         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1879                  data->auth_flavourlen);
1880         return -EINVAL;
1881
1882 out_no_address:
1883         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1884         return -EINVAL;
1885
1886 out_no_client_address:
1887         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1888         return -EINVAL;
1889 }
1890
1891 /*
1892  * Get the superblock for an NFS4 mountpoint
1893  */
1894 static int nfs4_get_sb(struct file_system_type *fs_type,
1895         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1896 {
1897         struct nfs_parsed_mount_data data;
1898         struct super_block *s;
1899         struct nfs_server *server;
1900         struct nfs_fh mntfh;
1901         struct dentry *mntroot;
1902         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1903         struct nfs_sb_mountdata sb_mntdata = {
1904                 .mntflags = flags,
1905         };
1906         int error;
1907
1908         security_init_mnt_opts(&data.lsm_opts);
1909
1910         /* Validate the mount data */
1911         error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1912         if (error < 0)
1913                 goto out;
1914
1915         /* Get a volume representation */
1916         server = nfs4_create_server(&data, &mntfh);
1917         if (IS_ERR(server)) {
1918                 error = PTR_ERR(server);
1919                 goto out;
1920         }
1921         sb_mntdata.server = server;
1922
1923         if (server->flags & NFS4_MOUNT_UNSHARED)
1924                 compare_super = NULL;
1925
1926         /* Get a superblock - note that we may end up sharing one that already exists */
1927         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1928         if (IS_ERR(s)) {
1929                 error = PTR_ERR(s);
1930                 goto out_free;
1931         }
1932
1933         if (s->s_fs_info != server) {
1934                 nfs_free_server(server);
1935                 server = NULL;
1936         }
1937
1938         if (!s->s_root) {
1939                 /* initial superblock/root creation */
1940                 nfs4_fill_super(s);
1941         }
1942
1943         mntroot = nfs4_get_root(s, &mntfh);
1944         if (IS_ERR(mntroot)) {
1945                 error = PTR_ERR(mntroot);
1946                 goto error_splat_super;
1947         }
1948
1949         s->s_flags |= MS_ACTIVE;
1950         mnt->mnt_sb = s;
1951         mnt->mnt_root = mntroot;
1952         error = 0;
1953
1954 out:
1955         kfree(data.client_address);
1956         kfree(data.nfs_server.export_path);
1957         kfree(data.nfs_server.hostname);
1958         security_free_mnt_opts(&data.lsm_opts);
1959         return error;
1960
1961 out_free:
1962         nfs_free_server(server);
1963         goto out;
1964
1965 error_splat_super:
1966         up_write(&s->s_umount);
1967         deactivate_super(s);
1968         goto out;
1969 }
1970
1971 static void nfs4_kill_super(struct super_block *sb)
1972 {
1973         struct nfs_server *server = NFS_SB(sb);
1974
1975         nfs_return_all_delegations(sb);
1976         kill_anon_super(sb);
1977
1978         nfs4_renewd_prepare_shutdown(server);
1979         nfs_free_server(server);
1980 }
1981
1982 /*
1983  * Clone an NFS4 server record on xdev traversal (FSID-change)
1984  */
1985 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1986                             const char *dev_name, void *raw_data,
1987                             struct vfsmount *mnt)
1988 {
1989         struct nfs_clone_mount *data = raw_data;
1990         struct super_block *s;
1991         struct nfs_server *server;
1992         struct dentry *mntroot;
1993         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1994         struct nfs_sb_mountdata sb_mntdata = {
1995                 .mntflags = flags,
1996         };
1997         int error;
1998
1999         dprintk("--> nfs4_xdev_get_sb()\n");
2000
2001         /* create a new volume representation */
2002         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2003         if (IS_ERR(server)) {
2004                 error = PTR_ERR(server);
2005                 goto out_err_noserver;
2006         }
2007         sb_mntdata.server = server;
2008
2009         if (server->flags & NFS4_MOUNT_UNSHARED)
2010                 compare_super = NULL;
2011
2012         /* Get a superblock - note that we may end up sharing one that already exists */
2013         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2014         if (IS_ERR(s)) {
2015                 error = PTR_ERR(s);
2016                 goto out_err_nosb;
2017         }
2018
2019         if (s->s_fs_info != server) {
2020                 nfs_free_server(server);
2021                 server = NULL;
2022         }
2023
2024         if (!s->s_root) {
2025                 /* initial superblock/root creation */
2026                 nfs4_clone_super(s, data->sb);
2027         }
2028
2029         mntroot = nfs4_get_root(s, data->fh);
2030         if (IS_ERR(mntroot)) {
2031                 error = PTR_ERR(mntroot);
2032                 goto error_splat_super;
2033         }
2034         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2035                 dput(mntroot);
2036                 error = -ESTALE;
2037                 goto error_splat_super;
2038         }
2039
2040         s->s_flags |= MS_ACTIVE;
2041         mnt->mnt_sb = s;
2042         mnt->mnt_root = mntroot;
2043
2044         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2045         return 0;
2046
2047 out_err_nosb:
2048         nfs_free_server(server);
2049 out_err_noserver:
2050         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2051         return error;
2052
2053 error_splat_super:
2054         up_write(&s->s_umount);
2055         deactivate_super(s);
2056         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2057         return error;
2058 }
2059
2060 /*
2061  * Create an NFS4 server record on referral traversal
2062  */
2063 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2064                                 const char *dev_name, void *raw_data,
2065                                 struct vfsmount *mnt)
2066 {
2067         struct nfs_clone_mount *data = raw_data;
2068         struct super_block *s;
2069         struct nfs_server *server;
2070         struct dentry *mntroot;
2071         struct nfs_fh mntfh;
2072         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2073         struct nfs_sb_mountdata sb_mntdata = {
2074                 .mntflags = flags,
2075         };
2076         int error;
2077
2078         dprintk("--> nfs4_referral_get_sb()\n");
2079
2080         /* create a new volume representation */
2081         server = nfs4_create_referral_server(data, &mntfh);
2082         if (IS_ERR(server)) {
2083                 error = PTR_ERR(server);
2084                 goto out_err_noserver;
2085         }
2086         sb_mntdata.server = server;
2087
2088         if (server->flags & NFS4_MOUNT_UNSHARED)
2089                 compare_super = NULL;
2090
2091         /* Get a superblock - note that we may end up sharing one that already exists */
2092         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2093         if (IS_ERR(s)) {
2094                 error = PTR_ERR(s);
2095                 goto out_err_nosb;
2096         }
2097
2098         if (s->s_fs_info != server) {
2099                 nfs_free_server(server);
2100                 server = NULL;
2101         }
2102
2103         if (!s->s_root) {
2104                 /* initial superblock/root creation */
2105                 nfs4_fill_super(s);
2106         }
2107
2108         mntroot = nfs4_get_root(s, &mntfh);
2109         if (IS_ERR(mntroot)) {
2110                 error = PTR_ERR(mntroot);
2111                 goto error_splat_super;
2112         }
2113         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2114                 dput(mntroot);
2115                 error = -ESTALE;
2116                 goto error_splat_super;
2117         }
2118
2119         s->s_flags |= MS_ACTIVE;
2120         mnt->mnt_sb = s;
2121         mnt->mnt_root = mntroot;
2122
2123         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2124         return 0;
2125
2126 out_err_nosb:
2127         nfs_free_server(server);
2128 out_err_noserver:
2129         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2130         return error;
2131
2132 error_splat_super:
2133         up_write(&s->s_umount);
2134         deactivate_super(s);
2135         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2136         return error;
2137 }
2138
2139 #endif /* CONFIG_NFS_V4 */