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@lxorguk.ukuu.org.uk>, 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/mnt_namespace.h> 46 #include <linux/namei.h> 47 #include <linux/nfs_idmap.h> 48 #include <linux/vfs.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <net/ipv6.h> 52 #include <linux/netdevice.h> 53 #include <linux/nfs_xdr.h> 54 #include <linux/magic.h> 55 #include <linux/parser.h> 56 57 #include <asm/system.h> 58 #include <asm/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 67 #define NFSDBG_FACILITY NFSDBG_VFS 68 69 enum { 70 /* Mount options that take no arguments */ 71 Opt_soft, Opt_hard, 72 Opt_posix, Opt_noposix, 73 Opt_cto, Opt_nocto, 74 Opt_ac, Opt_noac, 75 Opt_lock, Opt_nolock, 76 Opt_v2, Opt_v3, Opt_v4, 77 Opt_udp, Opt_tcp, Opt_rdma, 78 Opt_acl, Opt_noacl, 79 Opt_rdirplus, Opt_nordirplus, 80 Opt_sharecache, Opt_nosharecache, 81 Opt_resvport, Opt_noresvport, 82 Opt_fscache, Opt_nofscache, 83 84 /* Mount options that take integer arguments */ 85 Opt_port, 86 Opt_rsize, Opt_wsize, Opt_bsize, 87 Opt_timeo, Opt_retrans, 88 Opt_acregmin, Opt_acregmax, 89 Opt_acdirmin, Opt_acdirmax, 90 Opt_actimeo, 91 Opt_namelen, 92 Opt_mountport, 93 Opt_mountvers, 94 Opt_nfsvers, 95 Opt_minorversion, 96 97 /* Mount options that take string arguments */ 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 99 Opt_addr, Opt_mountaddr, Opt_clientaddr, 100 Opt_lookupcache, 101 Opt_fscache_uniq, 102 103 /* Special mount options */ 104 Opt_userspace, Opt_deprecated, Opt_sloppy, 105 106 Opt_err 107 }; 108 109 static const match_table_t nfs_mount_option_tokens = { 110 { Opt_userspace, "bg" }, 111 { Opt_userspace, "fg" }, 112 { Opt_userspace, "retry=%s" }, 113 114 { Opt_sloppy, "sloppy" }, 115 116 { Opt_soft, "soft" }, 117 { Opt_hard, "hard" }, 118 { Opt_deprecated, "intr" }, 119 { Opt_deprecated, "nointr" }, 120 { Opt_posix, "posix" }, 121 { Opt_noposix, "noposix" }, 122 { Opt_cto, "cto" }, 123 { Opt_nocto, "nocto" }, 124 { Opt_ac, "ac" }, 125 { Opt_noac, "noac" }, 126 { Opt_lock, "lock" }, 127 { Opt_nolock, "nolock" }, 128 { Opt_v2, "v2" }, 129 { Opt_v3, "v3" }, 130 { Opt_v4, "v4" }, 131 { Opt_udp, "udp" }, 132 { Opt_tcp, "tcp" }, 133 { Opt_rdma, "rdma" }, 134 { Opt_acl, "acl" }, 135 { Opt_noacl, "noacl" }, 136 { Opt_rdirplus, "rdirplus" }, 137 { Opt_nordirplus, "nordirplus" }, 138 { Opt_sharecache, "sharecache" }, 139 { Opt_nosharecache, "nosharecache" }, 140 { Opt_resvport, "resvport" }, 141 { Opt_noresvport, "noresvport" }, 142 { Opt_fscache, "fsc" }, 143 { Opt_fscache_uniq, "fsc=%s" }, 144 { Opt_nofscache, "nofsc" }, 145 146 { Opt_port, "port=%s" }, 147 { Opt_rsize, "rsize=%s" }, 148 { Opt_wsize, "wsize=%s" }, 149 { Opt_bsize, "bsize=%s" }, 150 { Opt_timeo, "timeo=%s" }, 151 { Opt_retrans, "retrans=%s" }, 152 { Opt_acregmin, "acregmin=%s" }, 153 { Opt_acregmax, "acregmax=%s" }, 154 { Opt_acdirmin, "acdirmin=%s" }, 155 { Opt_acdirmax, "acdirmax=%s" }, 156 { Opt_actimeo, "actimeo=%s" }, 157 { Opt_namelen, "namlen=%s" }, 158 { Opt_mountport, "mountport=%s" }, 159 { Opt_mountvers, "mountvers=%s" }, 160 { Opt_nfsvers, "nfsvers=%s" }, 161 { Opt_nfsvers, "vers=%s" }, 162 { Opt_minorversion, "minorversion=%s" }, 163 164 { Opt_sec, "sec=%s" }, 165 { Opt_proto, "proto=%s" }, 166 { Opt_mountproto, "mountproto=%s" }, 167 { Opt_addr, "addr=%s" }, 168 { Opt_clientaddr, "clientaddr=%s" }, 169 { Opt_mounthost, "mounthost=%s" }, 170 { Opt_mountaddr, "mountaddr=%s" }, 171 172 { Opt_lookupcache, "lookupcache=%s" }, 173 174 { Opt_err, NULL } 175 }; 176 177 enum { 178 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, 179 180 Opt_xprt_err 181 }; 182 183 static const match_table_t nfs_xprt_protocol_tokens = { 184 { Opt_xprt_udp, "udp" }, 185 { Opt_xprt_tcp, "tcp" }, 186 { Opt_xprt_rdma, "rdma" }, 187 188 { Opt_xprt_err, NULL } 189 }; 190 191 enum { 192 Opt_sec_none, Opt_sec_sys, 193 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 194 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 195 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 196 197 Opt_sec_err 198 }; 199 200 static const match_table_t nfs_secflavor_tokens = { 201 { Opt_sec_none, "none" }, 202 { Opt_sec_none, "null" }, 203 { Opt_sec_sys, "sys" }, 204 205 { Opt_sec_krb5, "krb5" }, 206 { Opt_sec_krb5i, "krb5i" }, 207 { Opt_sec_krb5p, "krb5p" }, 208 209 { Opt_sec_lkey, "lkey" }, 210 { Opt_sec_lkeyi, "lkeyi" }, 211 { Opt_sec_lkeyp, "lkeyp" }, 212 213 { Opt_sec_spkm, "spkm3" }, 214 { Opt_sec_spkmi, "spkm3i" }, 215 { Opt_sec_spkmp, "spkm3p" }, 216 217 { Opt_sec_err, NULL } 218 }; 219 220 enum { 221 Opt_lookupcache_all, Opt_lookupcache_positive, 222 Opt_lookupcache_none, 223 224 Opt_lookupcache_err 225 }; 226 227 static match_table_t nfs_lookupcache_tokens = { 228 { Opt_lookupcache_all, "all" }, 229 { Opt_lookupcache_positive, "pos" }, 230 { Opt_lookupcache_positive, "positive" }, 231 { Opt_lookupcache_none, "none" }, 232 233 { Opt_lookupcache_err, NULL } 234 }; 235 236 237 static void nfs_umount_begin(struct super_block *); 238 static int nfs_statfs(struct dentry *, struct kstatfs *); 239 static int nfs_show_options(struct seq_file *, struct vfsmount *); 240 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 241 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 242 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 244 static void nfs_kill_super(struct super_block *); 245 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 246 247 static struct file_system_type nfs_fs_type = { 248 .owner = THIS_MODULE, 249 .name = "nfs", 250 .get_sb = nfs_get_sb, 251 .kill_sb = nfs_kill_super, 252 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 253 }; 254 255 struct file_system_type nfs_xdev_fs_type = { 256 .owner = THIS_MODULE, 257 .name = "nfs", 258 .get_sb = nfs_xdev_get_sb, 259 .kill_sb = nfs_kill_super, 260 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 261 }; 262 263 static const struct super_operations nfs_sops = { 264 .alloc_inode = nfs_alloc_inode, 265 .destroy_inode = nfs_destroy_inode, 266 .write_inode = nfs_write_inode, 267 .statfs = nfs_statfs, 268 .clear_inode = nfs_clear_inode, 269 .umount_begin = nfs_umount_begin, 270 .show_options = nfs_show_options, 271 .show_stats = nfs_show_stats, 272 .remount_fs = nfs_remount, 273 }; 274 275 #ifdef CONFIG_NFS_V4 276 static int nfs4_validate_text_mount_data(void *options, 277 struct nfs_parsed_mount_data *args, const char *dev_name); 278 static int nfs4_try_mount(int flags, const char *dev_name, 279 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 280 static int nfs4_get_sb(struct file_system_type *fs_type, 281 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 282 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 284 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 286 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 288 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 290 static void nfs4_kill_super(struct super_block *sb); 291 292 static struct file_system_type nfs4_fs_type = { 293 .owner = THIS_MODULE, 294 .name = "nfs4", 295 .get_sb = nfs4_get_sb, 296 .kill_sb = nfs4_kill_super, 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 298 }; 299 300 static struct file_system_type nfs4_remote_fs_type = { 301 .owner = THIS_MODULE, 302 .name = "nfs4", 303 .get_sb = nfs4_remote_get_sb, 304 .kill_sb = nfs4_kill_super, 305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 306 }; 307 308 struct file_system_type nfs4_xdev_fs_type = { 309 .owner = THIS_MODULE, 310 .name = "nfs4", 311 .get_sb = nfs4_xdev_get_sb, 312 .kill_sb = nfs4_kill_super, 313 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 314 }; 315 316 static struct file_system_type nfs4_remote_referral_fs_type = { 317 .owner = THIS_MODULE, 318 .name = "nfs4", 319 .get_sb = nfs4_remote_referral_get_sb, 320 .kill_sb = nfs4_kill_super, 321 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 322 }; 323 324 struct file_system_type nfs4_referral_fs_type = { 325 .owner = THIS_MODULE, 326 .name = "nfs4", 327 .get_sb = nfs4_referral_get_sb, 328 .kill_sb = nfs4_kill_super, 329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 330 }; 331 332 static const struct super_operations nfs4_sops = { 333 .alloc_inode = nfs_alloc_inode, 334 .destroy_inode = nfs_destroy_inode, 335 .write_inode = nfs_write_inode, 336 .statfs = nfs_statfs, 337 .clear_inode = nfs4_clear_inode, 338 .umount_begin = nfs_umount_begin, 339 .show_options = nfs_show_options, 340 .show_stats = nfs_show_stats, 341 .remount_fs = nfs_remount, 342 }; 343 #endif 344 345 static struct shrinker acl_shrinker = { 346 .shrink = nfs_access_cache_shrinker, 347 .seeks = DEFAULT_SEEKS, 348 }; 349 350 /* 351 * Register the NFS filesystems 352 */ 353 int __init register_nfs_fs(void) 354 { 355 int ret; 356 357 ret = register_filesystem(&nfs_fs_type); 358 if (ret < 0) 359 goto error_0; 360 361 ret = nfs_register_sysctl(); 362 if (ret < 0) 363 goto error_1; 364 #ifdef CONFIG_NFS_V4 365 ret = register_filesystem(&nfs4_fs_type); 366 if (ret < 0) 367 goto error_2; 368 #endif 369 register_shrinker(&acl_shrinker); 370 return 0; 371 372 #ifdef CONFIG_NFS_V4 373 error_2: 374 nfs_unregister_sysctl(); 375 #endif 376 error_1: 377 unregister_filesystem(&nfs_fs_type); 378 error_0: 379 return ret; 380 } 381 382 /* 383 * Unregister the NFS filesystems 384 */ 385 void __exit unregister_nfs_fs(void) 386 { 387 unregister_shrinker(&acl_shrinker); 388 #ifdef CONFIG_NFS_V4 389 unregister_filesystem(&nfs4_fs_type); 390 #endif 391 nfs_unregister_sysctl(); 392 unregister_filesystem(&nfs_fs_type); 393 } 394 395 void nfs_sb_active(struct super_block *sb) 396 { 397 struct nfs_server *server = NFS_SB(sb); 398 399 if (atomic_inc_return(&server->active) == 1) 400 atomic_inc(&sb->s_active); 401 } 402 403 void nfs_sb_deactive(struct super_block *sb) 404 { 405 struct nfs_server *server = NFS_SB(sb); 406 407 if (atomic_dec_and_test(&server->active)) 408 deactivate_super(sb); 409 } 410 411 /* 412 * Deliver file system statistics to userspace 413 */ 414 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 415 { 416 struct nfs_server *server = NFS_SB(dentry->d_sb); 417 unsigned char blockbits; 418 unsigned long blockres; 419 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 420 struct nfs_fattr fattr; 421 struct nfs_fsstat res = { 422 .fattr = &fattr, 423 }; 424 int error; 425 426 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 427 if (error < 0) 428 goto out_err; 429 buf->f_type = NFS_SUPER_MAGIC; 430 431 /* 432 * Current versions of glibc do not correctly handle the 433 * case where f_frsize != f_bsize. Eventually we want to 434 * report the value of wtmult in this field. 435 */ 436 buf->f_frsize = dentry->d_sb->s_blocksize; 437 438 /* 439 * On most *nix systems, f_blocks, f_bfree, and f_bavail 440 * are reported in units of f_frsize. Linux hasn't had 441 * an f_frsize field in its statfs struct until recently, 442 * thus historically Linux's sys_statfs reports these 443 * fields in units of f_bsize. 444 */ 445 buf->f_bsize = dentry->d_sb->s_blocksize; 446 blockbits = dentry->d_sb->s_blocksize_bits; 447 blockres = (1 << blockbits) - 1; 448 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 449 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 450 buf->f_bavail = (res.abytes + blockres) >> blockbits; 451 452 buf->f_files = res.tfiles; 453 buf->f_ffree = res.afiles; 454 455 buf->f_namelen = server->namelen; 456 457 return 0; 458 459 out_err: 460 dprintk("%s: statfs error = %d\n", __func__, -error); 461 return error; 462 } 463 464 /* 465 * Map the security flavour number to a name 466 */ 467 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 468 { 469 static const struct { 470 rpc_authflavor_t flavour; 471 const char *str; 472 } sec_flavours[] = { 473 { RPC_AUTH_NULL, "null" }, 474 { RPC_AUTH_UNIX, "sys" }, 475 { RPC_AUTH_GSS_KRB5, "krb5" }, 476 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 477 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 478 { RPC_AUTH_GSS_LKEY, "lkey" }, 479 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 480 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 481 { RPC_AUTH_GSS_SPKM, "spkm" }, 482 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 483 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 484 { UINT_MAX, "unknown" } 485 }; 486 int i; 487 488 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 489 if (sec_flavours[i].flavour == flavour) 490 break; 491 } 492 return sec_flavours[i].str; 493 } 494 495 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 496 int showdefaults) 497 { 498 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 499 500 switch (sap->sa_family) { 501 case AF_INET: { 502 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 503 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 504 break; 505 } 506 case AF_INET6: { 507 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 508 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr); 509 break; 510 } 511 default: 512 if (showdefaults) 513 seq_printf(m, ",mountaddr=unspecified"); 514 } 515 516 if (nfss->mountd_version || showdefaults) 517 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 518 if (nfss->mountd_port || showdefaults) 519 seq_printf(m, ",mountport=%u", nfss->mountd_port); 520 521 switch (nfss->mountd_protocol) { 522 case IPPROTO_UDP: 523 seq_printf(m, ",mountproto=udp"); 524 break; 525 case IPPROTO_TCP: 526 seq_printf(m, ",mountproto=tcp"); 527 break; 528 default: 529 if (showdefaults) 530 seq_printf(m, ",mountproto=auto"); 531 } 532 } 533 534 /* 535 * Describe the mount options in force on this server representation 536 */ 537 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 538 int showdefaults) 539 { 540 static const struct proc_nfs_info { 541 int flag; 542 const char *str; 543 const char *nostr; 544 } nfs_info[] = { 545 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 546 { NFS_MOUNT_POSIX, ",posix", "" }, 547 { NFS_MOUNT_NOCTO, ",nocto", "" }, 548 { NFS_MOUNT_NOAC, ",noac", "" }, 549 { NFS_MOUNT_NONLM, ",nolock", "" }, 550 { NFS_MOUNT_NOACL, ",noacl", "" }, 551 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 552 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 553 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 554 { 0, NULL, NULL } 555 }; 556 const struct proc_nfs_info *nfs_infop; 557 struct nfs_client *clp = nfss->nfs_client; 558 u32 version = clp->rpc_ops->version; 559 560 seq_printf(m, ",vers=%u", version); 561 seq_printf(m, ",rsize=%u", nfss->rsize); 562 seq_printf(m, ",wsize=%u", nfss->wsize); 563 if (nfss->bsize != 0) 564 seq_printf(m, ",bsize=%u", nfss->bsize); 565 seq_printf(m, ",namlen=%u", nfss->namelen); 566 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 567 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 568 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 569 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 570 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 571 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 572 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 573 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 574 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 575 if (nfss->flags & nfs_infop->flag) 576 seq_puts(m, nfs_infop->str); 577 else 578 seq_puts(m, nfs_infop->nostr); 579 } 580 seq_printf(m, ",proto=%s", 581 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); 582 if (version == 4) { 583 if (nfss->port != NFS_PORT) 584 seq_printf(m, ",port=%u", nfss->port); 585 } else 586 if (nfss->port) 587 seq_printf(m, ",port=%u", nfss->port); 588 589 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 590 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 591 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 592 593 if (version != 4) 594 nfs_show_mountd_options(m, nfss, showdefaults); 595 596 #ifdef CONFIG_NFS_V4 597 if (clp->rpc_ops->version == 4) 598 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 599 #endif 600 if (nfss->options & NFS_OPTION_FSCACHE) 601 seq_printf(m, ",fsc"); 602 } 603 604 /* 605 * Describe the mount options on this VFS mountpoint 606 */ 607 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 608 { 609 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 610 611 nfs_show_mount_options(m, nfss, 0); 612 613 seq_printf(m, ",addr=%s", 614 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 615 RPC_DISPLAY_ADDR)); 616 617 return 0; 618 } 619 620 /* 621 * Present statistical information for this VFS mountpoint 622 */ 623 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 624 { 625 int i, cpu; 626 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 627 struct rpc_auth *auth = nfss->client->cl_auth; 628 struct nfs_iostats totals = { }; 629 630 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 631 632 /* 633 * Display all mount option settings 634 */ 635 seq_printf(m, "\n\topts:\t"); 636 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 637 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 638 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 639 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 640 nfs_show_mount_options(m, nfss, 1); 641 642 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 643 644 seq_printf(m, "\n\tcaps:\t"); 645 seq_printf(m, "caps=0x%x", nfss->caps); 646 seq_printf(m, ",wtmult=%u", nfss->wtmult); 647 seq_printf(m, ",dtsize=%u", nfss->dtsize); 648 seq_printf(m, ",bsize=%u", nfss->bsize); 649 seq_printf(m, ",namlen=%u", nfss->namelen); 650 651 #ifdef CONFIG_NFS_V4 652 if (nfss->nfs_client->rpc_ops->version == 4) { 653 seq_printf(m, "\n\tnfsv4:\t"); 654 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 655 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 656 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 657 } 658 #endif 659 660 /* 661 * Display security flavor in effect for this mount 662 */ 663 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 664 if (auth->au_flavor) 665 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 666 667 /* 668 * Display superblock I/O counters 669 */ 670 for_each_possible_cpu(cpu) { 671 struct nfs_iostats *stats; 672 673 preempt_disable(); 674 stats = per_cpu_ptr(nfss->io_stats, cpu); 675 676 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 677 totals.events[i] += stats->events[i]; 678 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 679 totals.bytes[i] += stats->bytes[i]; 680 #ifdef CONFIG_NFS_FSCACHE 681 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 682 totals.fscache[i] += stats->fscache[i]; 683 #endif 684 685 preempt_enable(); 686 } 687 688 seq_printf(m, "\n\tevents:\t"); 689 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 690 seq_printf(m, "%lu ", totals.events[i]); 691 seq_printf(m, "\n\tbytes:\t"); 692 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 693 seq_printf(m, "%Lu ", totals.bytes[i]); 694 #ifdef CONFIG_NFS_FSCACHE 695 if (nfss->options & NFS_OPTION_FSCACHE) { 696 seq_printf(m, "\n\tfsc:\t"); 697 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 698 seq_printf(m, "%Lu ", totals.bytes[i]); 699 } 700 #endif 701 seq_printf(m, "\n"); 702 703 rpc_print_iostats(m, nfss->client); 704 705 return 0; 706 } 707 708 /* 709 * Begin unmount by attempting to remove all automounted mountpoints we added 710 * in response to xdev traversals and referrals 711 */ 712 static void nfs_umount_begin(struct super_block *sb) 713 { 714 struct nfs_server *server; 715 struct rpc_clnt *rpc; 716 717 lock_kernel(); 718 719 server = NFS_SB(sb); 720 /* -EIO all pending I/O */ 721 rpc = server->client_acl; 722 if (!IS_ERR(rpc)) 723 rpc_killall_tasks(rpc); 724 rpc = server->client; 725 if (!IS_ERR(rpc)) 726 rpc_killall_tasks(rpc); 727 728 unlock_kernel(); 729 } 730 731 /* 732 * Sanity-check a server address provided by the mount command. 733 * 734 * Address family must be initialized, and address must not be 735 * the ANY address for that family. 736 */ 737 static int nfs_verify_server_address(struct sockaddr *addr) 738 { 739 switch (addr->sa_family) { 740 case AF_INET: { 741 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 742 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 743 } 744 case AF_INET6: { 745 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 746 return !ipv6_addr_any(sa); 747 } 748 } 749 750 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 751 return 0; 752 } 753 754 /* 755 * Select between a default port value and a user-specified port value. 756 * If a zero value is set, then autobind will be used. 757 */ 758 static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port, 759 const unsigned short default_port) 760 { 761 unsigned short port = default_port; 762 763 if (parsed_port != NFS_UNSPEC_PORT) 764 port = parsed_port; 765 766 rpc_set_port(sap, port); 767 } 768 769 /* 770 * Sanity check the NFS transport protocol. 771 * 772 */ 773 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 774 { 775 switch (mnt->nfs_server.protocol) { 776 case XPRT_TRANSPORT_UDP: 777 case XPRT_TRANSPORT_TCP: 778 case XPRT_TRANSPORT_RDMA: 779 break; 780 default: 781 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 782 } 783 } 784 785 /* 786 * For text based NFSv2/v3 mounts, the mount protocol transport default 787 * settings should depend upon the specified NFS transport. 788 */ 789 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 790 { 791 nfs_validate_transport_protocol(mnt); 792 793 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 794 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 795 return; 796 switch (mnt->nfs_server.protocol) { 797 case XPRT_TRANSPORT_UDP: 798 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 799 break; 800 case XPRT_TRANSPORT_TCP: 801 case XPRT_TRANSPORT_RDMA: 802 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 803 } 804 } 805 806 /* 807 * Parse the value of the 'sec=' option. 808 */ 809 static int nfs_parse_security_flavors(char *value, 810 struct nfs_parsed_mount_data *mnt) 811 { 812 substring_t args[MAX_OPT_ARGS]; 813 814 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 815 816 switch (match_token(value, nfs_secflavor_tokens, args)) { 817 case Opt_sec_none: 818 mnt->auth_flavors[0] = RPC_AUTH_NULL; 819 break; 820 case Opt_sec_sys: 821 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 822 break; 823 case Opt_sec_krb5: 824 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 825 break; 826 case Opt_sec_krb5i: 827 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 828 break; 829 case Opt_sec_krb5p: 830 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 831 break; 832 case Opt_sec_lkey: 833 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 834 break; 835 case Opt_sec_lkeyi: 836 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 837 break; 838 case Opt_sec_lkeyp: 839 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 840 break; 841 case Opt_sec_spkm: 842 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 843 break; 844 case Opt_sec_spkmi: 845 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 846 break; 847 case Opt_sec_spkmp: 848 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 849 break; 850 default: 851 return 0; 852 } 853 854 mnt->auth_flavor_len = 1; 855 return 1; 856 } 857 858 /* 859 * Error-check and convert a string of mount options from user space into 860 * a data structure. The whole mount string is processed; bad options are 861 * skipped as they are encountered. If there were no errors, return 1; 862 * otherwise return 0 (zero). 863 */ 864 static int nfs_parse_mount_options(char *raw, 865 struct nfs_parsed_mount_data *mnt) 866 { 867 char *p, *string, *secdata; 868 int rc, sloppy = 0, invalid_option = 0; 869 870 if (!raw) { 871 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 872 return 1; 873 } 874 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 875 876 secdata = alloc_secdata(); 877 if (!secdata) 878 goto out_nomem; 879 880 rc = security_sb_copy_data(raw, secdata); 881 if (rc) 882 goto out_security_failure; 883 884 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 885 if (rc) 886 goto out_security_failure; 887 888 free_secdata(secdata); 889 890 while ((p = strsep(&raw, ",")) != NULL) { 891 substring_t args[MAX_OPT_ARGS]; 892 unsigned long option; 893 int token; 894 895 if (!*p) 896 continue; 897 898 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 899 900 token = match_token(p, nfs_mount_option_tokens, args); 901 switch (token) { 902 903 /* 904 * boolean options: foo/nofoo 905 */ 906 case Opt_soft: 907 mnt->flags |= NFS_MOUNT_SOFT; 908 break; 909 case Opt_hard: 910 mnt->flags &= ~NFS_MOUNT_SOFT; 911 break; 912 case Opt_posix: 913 mnt->flags |= NFS_MOUNT_POSIX; 914 break; 915 case Opt_noposix: 916 mnt->flags &= ~NFS_MOUNT_POSIX; 917 break; 918 case Opt_cto: 919 mnt->flags &= ~NFS_MOUNT_NOCTO; 920 break; 921 case Opt_nocto: 922 mnt->flags |= NFS_MOUNT_NOCTO; 923 break; 924 case Opt_ac: 925 mnt->flags &= ~NFS_MOUNT_NOAC; 926 break; 927 case Opt_noac: 928 mnt->flags |= NFS_MOUNT_NOAC; 929 break; 930 case Opt_lock: 931 mnt->flags &= ~NFS_MOUNT_NONLM; 932 break; 933 case Opt_nolock: 934 mnt->flags |= NFS_MOUNT_NONLM; 935 break; 936 case Opt_v2: 937 mnt->flags &= ~NFS_MOUNT_VER3; 938 mnt->version = 2; 939 break; 940 case Opt_v3: 941 mnt->flags |= NFS_MOUNT_VER3; 942 mnt->version = 3; 943 break; 944 #ifdef CONFIG_NFS_V4 945 case Opt_v4: 946 mnt->flags &= ~NFS_MOUNT_VER3; 947 mnt->version = 4; 948 break; 949 #endif 950 case Opt_udp: 951 mnt->flags &= ~NFS_MOUNT_TCP; 952 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 953 break; 954 case Opt_tcp: 955 mnt->flags |= NFS_MOUNT_TCP; 956 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 957 break; 958 case Opt_rdma: 959 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 960 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 961 xprt_load_transport(p); 962 break; 963 case Opt_acl: 964 mnt->flags &= ~NFS_MOUNT_NOACL; 965 break; 966 case Opt_noacl: 967 mnt->flags |= NFS_MOUNT_NOACL; 968 break; 969 case Opt_rdirplus: 970 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 971 break; 972 case Opt_nordirplus: 973 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 974 break; 975 case Opt_sharecache: 976 mnt->flags &= ~NFS_MOUNT_UNSHARED; 977 break; 978 case Opt_nosharecache: 979 mnt->flags |= NFS_MOUNT_UNSHARED; 980 break; 981 case Opt_resvport: 982 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 983 break; 984 case Opt_noresvport: 985 mnt->flags |= NFS_MOUNT_NORESVPORT; 986 break; 987 case Opt_fscache: 988 mnt->options |= NFS_OPTION_FSCACHE; 989 kfree(mnt->fscache_uniq); 990 mnt->fscache_uniq = NULL; 991 break; 992 case Opt_nofscache: 993 mnt->options &= ~NFS_OPTION_FSCACHE; 994 kfree(mnt->fscache_uniq); 995 mnt->fscache_uniq = NULL; 996 break; 997 case Opt_fscache_uniq: 998 string = match_strdup(args); 999 if (!string) 1000 goto out_nomem; 1001 kfree(mnt->fscache_uniq); 1002 mnt->fscache_uniq = string; 1003 mnt->options |= NFS_OPTION_FSCACHE; 1004 break; 1005 1006 /* 1007 * options that take numeric values 1008 */ 1009 case Opt_port: 1010 string = match_strdup(args); 1011 if (string == NULL) 1012 goto out_nomem; 1013 rc = strict_strtoul(string, 10, &option); 1014 kfree(string); 1015 if (rc != 0 || option > USHORT_MAX) 1016 goto out_invalid_value; 1017 mnt->nfs_server.port = option; 1018 break; 1019 case Opt_rsize: 1020 string = match_strdup(args); 1021 if (string == NULL) 1022 goto out_nomem; 1023 rc = strict_strtoul(string, 10, &option); 1024 kfree(string); 1025 if (rc != 0) 1026 goto out_invalid_value; 1027 mnt->rsize = option; 1028 break; 1029 case Opt_wsize: 1030 string = match_strdup(args); 1031 if (string == NULL) 1032 goto out_nomem; 1033 rc = strict_strtoul(string, 10, &option); 1034 kfree(string); 1035 if (rc != 0) 1036 goto out_invalid_value; 1037 mnt->wsize = option; 1038 break; 1039 case Opt_bsize: 1040 string = match_strdup(args); 1041 if (string == NULL) 1042 goto out_nomem; 1043 rc = strict_strtoul(string, 10, &option); 1044 kfree(string); 1045 if (rc != 0) 1046 goto out_invalid_value; 1047 mnt->bsize = option; 1048 break; 1049 case Opt_timeo: 1050 string = match_strdup(args); 1051 if (string == NULL) 1052 goto out_nomem; 1053 rc = strict_strtoul(string, 10, &option); 1054 kfree(string); 1055 if (rc != 0 || option == 0) 1056 goto out_invalid_value; 1057 mnt->timeo = option; 1058 break; 1059 case Opt_retrans: 1060 string = match_strdup(args); 1061 if (string == NULL) 1062 goto out_nomem; 1063 rc = strict_strtoul(string, 10, &option); 1064 kfree(string); 1065 if (rc != 0 || option == 0) 1066 goto out_invalid_value; 1067 mnt->retrans = option; 1068 break; 1069 case Opt_acregmin: 1070 string = match_strdup(args); 1071 if (string == NULL) 1072 goto out_nomem; 1073 rc = strict_strtoul(string, 10, &option); 1074 kfree(string); 1075 if (rc != 0) 1076 goto out_invalid_value; 1077 mnt->acregmin = option; 1078 break; 1079 case Opt_acregmax: 1080 string = match_strdup(args); 1081 if (string == NULL) 1082 goto out_nomem; 1083 rc = strict_strtoul(string, 10, &option); 1084 kfree(string); 1085 if (rc != 0) 1086 goto out_invalid_value; 1087 mnt->acregmax = option; 1088 break; 1089 case Opt_acdirmin: 1090 string = match_strdup(args); 1091 if (string == NULL) 1092 goto out_nomem; 1093 rc = strict_strtoul(string, 10, &option); 1094 kfree(string); 1095 if (rc != 0) 1096 goto out_invalid_value; 1097 mnt->acdirmin = option; 1098 break; 1099 case Opt_acdirmax: 1100 string = match_strdup(args); 1101 if (string == NULL) 1102 goto out_nomem; 1103 rc = strict_strtoul(string, 10, &option); 1104 kfree(string); 1105 if (rc != 0) 1106 goto out_invalid_value; 1107 mnt->acdirmax = option; 1108 break; 1109 case Opt_actimeo: 1110 string = match_strdup(args); 1111 if (string == NULL) 1112 goto out_nomem; 1113 rc = strict_strtoul(string, 10, &option); 1114 kfree(string); 1115 if (rc != 0) 1116 goto out_invalid_value; 1117 mnt->acregmin = mnt->acregmax = 1118 mnt->acdirmin = mnt->acdirmax = option; 1119 break; 1120 case Opt_namelen: 1121 string = match_strdup(args); 1122 if (string == NULL) 1123 goto out_nomem; 1124 rc = strict_strtoul(string, 10, &option); 1125 kfree(string); 1126 if (rc != 0) 1127 goto out_invalid_value; 1128 mnt->namlen = option; 1129 break; 1130 case Opt_mountport: 1131 string = match_strdup(args); 1132 if (string == NULL) 1133 goto out_nomem; 1134 rc = strict_strtoul(string, 10, &option); 1135 kfree(string); 1136 if (rc != 0 || option > USHORT_MAX) 1137 goto out_invalid_value; 1138 mnt->mount_server.port = option; 1139 break; 1140 case Opt_mountvers: 1141 string = match_strdup(args); 1142 if (string == NULL) 1143 goto out_nomem; 1144 rc = strict_strtoul(string, 10, &option); 1145 kfree(string); 1146 if (rc != 0 || 1147 option < NFS_MNT_VERSION || 1148 option > NFS_MNT3_VERSION) 1149 goto out_invalid_value; 1150 mnt->mount_server.version = option; 1151 break; 1152 case Opt_nfsvers: 1153 string = match_strdup(args); 1154 if (string == NULL) 1155 goto out_nomem; 1156 rc = strict_strtoul(string, 10, &option); 1157 kfree(string); 1158 if (rc != 0) 1159 goto out_invalid_value; 1160 switch (option) { 1161 case NFS2_VERSION: 1162 mnt->flags &= ~NFS_MOUNT_VER3; 1163 mnt->version = 2; 1164 break; 1165 case NFS3_VERSION: 1166 mnt->flags |= NFS_MOUNT_VER3; 1167 mnt->version = 3; 1168 break; 1169 #ifdef CONFIG_NFS_V4 1170 case NFS4_VERSION: 1171 mnt->flags &= ~NFS_MOUNT_VER3; 1172 mnt->version = 4; 1173 break; 1174 #endif 1175 default: 1176 goto out_invalid_value; 1177 } 1178 break; 1179 case Opt_minorversion: 1180 string = match_strdup(args); 1181 if (string == NULL) 1182 goto out_nomem; 1183 rc = strict_strtoul(string, 10, &option); 1184 kfree(string); 1185 if (rc != 0) 1186 goto out_invalid_value; 1187 if (option > NFS4_MAX_MINOR_VERSION) 1188 goto out_invalid_value; 1189 mnt->minorversion = option; 1190 break; 1191 1192 /* 1193 * options that take text values 1194 */ 1195 case Opt_sec: 1196 string = match_strdup(args); 1197 if (string == NULL) 1198 goto out_nomem; 1199 rc = nfs_parse_security_flavors(string, mnt); 1200 kfree(string); 1201 if (!rc) { 1202 dfprintk(MOUNT, "NFS: unrecognized " 1203 "security flavor\n"); 1204 return 0; 1205 } 1206 break; 1207 case Opt_proto: 1208 string = match_strdup(args); 1209 if (string == NULL) 1210 goto out_nomem; 1211 token = match_token(string, 1212 nfs_xprt_protocol_tokens, args); 1213 1214 switch (token) { 1215 case Opt_xprt_udp: 1216 mnt->flags &= ~NFS_MOUNT_TCP; 1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1218 kfree(string); 1219 break; 1220 case Opt_xprt_tcp: 1221 mnt->flags |= NFS_MOUNT_TCP; 1222 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1223 kfree(string); 1224 break; 1225 case Opt_xprt_rdma: 1226 /* vector side protocols to TCP */ 1227 mnt->flags |= NFS_MOUNT_TCP; 1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1229 xprt_load_transport(string); 1230 kfree(string); 1231 break; 1232 default: 1233 dfprintk(MOUNT, "NFS: unrecognized " 1234 "transport protocol\n"); 1235 return 0; 1236 } 1237 break; 1238 case Opt_mountproto: 1239 string = match_strdup(args); 1240 if (string == NULL) 1241 goto out_nomem; 1242 token = match_token(string, 1243 nfs_xprt_protocol_tokens, args); 1244 kfree(string); 1245 1246 switch (token) { 1247 case Opt_xprt_udp: 1248 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1249 break; 1250 case Opt_xprt_tcp: 1251 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1252 break; 1253 case Opt_xprt_rdma: /* not used for side protocols */ 1254 default: 1255 dfprintk(MOUNT, "NFS: unrecognized " 1256 "transport protocol\n"); 1257 return 0; 1258 } 1259 break; 1260 case Opt_addr: 1261 string = match_strdup(args); 1262 if (string == NULL) 1263 goto out_nomem; 1264 mnt->nfs_server.addrlen = 1265 rpc_pton(string, strlen(string), 1266 (struct sockaddr *) 1267 &mnt->nfs_server.address, 1268 sizeof(mnt->nfs_server.address)); 1269 kfree(string); 1270 if (mnt->nfs_server.addrlen == 0) 1271 goto out_invalid_address; 1272 break; 1273 case Opt_clientaddr: 1274 string = match_strdup(args); 1275 if (string == NULL) 1276 goto out_nomem; 1277 kfree(mnt->client_address); 1278 mnt->client_address = string; 1279 break; 1280 case Opt_mounthost: 1281 string = match_strdup(args); 1282 if (string == NULL) 1283 goto out_nomem; 1284 kfree(mnt->mount_server.hostname); 1285 mnt->mount_server.hostname = string; 1286 break; 1287 case Opt_mountaddr: 1288 string = match_strdup(args); 1289 if (string == NULL) 1290 goto out_nomem; 1291 mnt->mount_server.addrlen = 1292 rpc_pton(string, strlen(string), 1293 (struct sockaddr *) 1294 &mnt->mount_server.address, 1295 sizeof(mnt->mount_server.address)); 1296 kfree(string); 1297 if (mnt->mount_server.addrlen == 0) 1298 goto out_invalid_address; 1299 break; 1300 case Opt_lookupcache: 1301 string = match_strdup(args); 1302 if (string == NULL) 1303 goto out_nomem; 1304 token = match_token(string, 1305 nfs_lookupcache_tokens, args); 1306 kfree(string); 1307 switch (token) { 1308 case Opt_lookupcache_all: 1309 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1310 break; 1311 case Opt_lookupcache_positive: 1312 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1313 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1314 break; 1315 case Opt_lookupcache_none: 1316 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1317 break; 1318 default: 1319 dfprintk(MOUNT, "NFS: invalid " 1320 "lookupcache argument\n"); 1321 return 0; 1322 }; 1323 break; 1324 1325 /* 1326 * Special options 1327 */ 1328 case Opt_sloppy: 1329 sloppy = 1; 1330 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1331 break; 1332 case Opt_userspace: 1333 case Opt_deprecated: 1334 dfprintk(MOUNT, "NFS: ignoring mount option " 1335 "'%s'\n", p); 1336 break; 1337 1338 default: 1339 invalid_option = 1; 1340 dfprintk(MOUNT, "NFS: unrecognized mount option " 1341 "'%s'\n", p); 1342 } 1343 } 1344 1345 if (!sloppy && invalid_option) 1346 return 0; 1347 1348 return 1; 1349 1350 out_invalid_address: 1351 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1352 return 0; 1353 out_invalid_value: 1354 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1355 return 0; 1356 out_nomem: 1357 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1358 return 0; 1359 out_security_failure: 1360 free_secdata(secdata); 1361 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1362 return 0; 1363 } 1364 1365 /* 1366 * Match the requested auth flavors with the list returned by 1367 * the server. Returns zero and sets the mount's authentication 1368 * flavor on success; returns -EACCES if server does not support 1369 * the requested flavor. 1370 */ 1371 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1372 struct nfs_mount_request *request) 1373 { 1374 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1375 1376 /* 1377 * Certain releases of Linux's mountd return an empty 1378 * flavor list. To prevent behavioral regression with 1379 * these servers (ie. rejecting mounts that used to 1380 * succeed), revert to pre-2.6.32 behavior (no checking) 1381 * if the returned flavor list is empty. 1382 */ 1383 if (server_authlist_len == 0) 1384 return 0; 1385 1386 /* 1387 * We avoid sophisticated negotiating here, as there are 1388 * plenty of cases where we can get it wrong, providing 1389 * either too little or too much security. 1390 * 1391 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1392 * flavor listed first. However, some servers list 1393 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1394 * preferred default, in args->auth_flavors[0] if user 1395 * didn't specify sec= mount option. 1396 */ 1397 for (i = 0; i < args->auth_flavor_len; i++) 1398 for (j = 0; j < server_authlist_len; j++) 1399 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1400 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1401 request->auth_flavs[j]); 1402 args->auth_flavors[0] = request->auth_flavs[j]; 1403 return 0; 1404 } 1405 1406 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1407 nfs_umount(request); 1408 return -EACCES; 1409 } 1410 1411 /* 1412 * Use the remote server's MOUNT service to request the NFS file handle 1413 * corresponding to the provided path. 1414 */ 1415 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1416 struct nfs_fh *root_fh) 1417 { 1418 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1419 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1420 struct nfs_mount_request request = { 1421 .sap = (struct sockaddr *) 1422 &args->mount_server.address, 1423 .dirpath = args->nfs_server.export_path, 1424 .protocol = args->mount_server.protocol, 1425 .fh = root_fh, 1426 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1427 .auth_flav_len = &server_authlist_len, 1428 .auth_flavs = server_authlist, 1429 }; 1430 int status; 1431 1432 if (args->mount_server.version == 0) { 1433 if (args->flags & NFS_MOUNT_VER3) 1434 args->mount_server.version = NFS_MNT3_VERSION; 1435 else 1436 args->mount_server.version = NFS_MNT_VERSION; 1437 } 1438 request.version = args->mount_server.version; 1439 1440 if (args->mount_server.hostname) 1441 request.hostname = args->mount_server.hostname; 1442 else 1443 request.hostname = args->nfs_server.hostname; 1444 1445 /* 1446 * Construct the mount server's address. 1447 */ 1448 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1449 memcpy(request.sap, &args->nfs_server.address, 1450 args->nfs_server.addrlen); 1451 args->mount_server.addrlen = args->nfs_server.addrlen; 1452 } 1453 request.salen = args->mount_server.addrlen; 1454 nfs_set_default_port(request.sap, args->mount_server.port, 0); 1455 1456 /* 1457 * Now ask the mount server to map our export path 1458 * to a file handle. 1459 */ 1460 status = nfs_mount(&request); 1461 if (status != 0) { 1462 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1463 request.hostname, status); 1464 return status; 1465 } 1466 1467 /* 1468 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1469 */ 1470 if (args->mount_server.version != NFS_MNT3_VERSION) 1471 return 0; 1472 return nfs_walk_authlist(args, &request); 1473 } 1474 1475 static int nfs_parse_simple_hostname(const char *dev_name, 1476 char **hostname, size_t maxnamlen, 1477 char **export_path, size_t maxpathlen) 1478 { 1479 size_t len; 1480 char *colon, *comma; 1481 1482 colon = strchr(dev_name, ':'); 1483 if (colon == NULL) 1484 goto out_bad_devname; 1485 1486 len = colon - dev_name; 1487 if (len > maxnamlen) 1488 goto out_hostname; 1489 1490 /* N.B. caller will free nfs_server.hostname in all cases */ 1491 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1492 if (!*hostname) 1493 goto out_nomem; 1494 1495 /* kill possible hostname list: not supported */ 1496 comma = strchr(*hostname, ','); 1497 if (comma != NULL) { 1498 if (comma == *hostname) 1499 goto out_bad_devname; 1500 *comma = '\0'; 1501 } 1502 1503 colon++; 1504 len = strlen(colon); 1505 if (len > maxpathlen) 1506 goto out_path; 1507 *export_path = kstrndup(colon, len, GFP_KERNEL); 1508 if (!*export_path) 1509 goto out_nomem; 1510 1511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1512 return 0; 1513 1514 out_bad_devname: 1515 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1516 return -EINVAL; 1517 1518 out_nomem: 1519 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1520 return -ENOMEM; 1521 1522 out_hostname: 1523 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1524 return -ENAMETOOLONG; 1525 1526 out_path: 1527 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1528 return -ENAMETOOLONG; 1529 } 1530 1531 /* 1532 * Hostname has square brackets around it because it contains one or 1533 * more colons. We look for the first closing square bracket, and a 1534 * colon must follow it. 1535 */ 1536 static int nfs_parse_protected_hostname(const char *dev_name, 1537 char **hostname, size_t maxnamlen, 1538 char **export_path, size_t maxpathlen) 1539 { 1540 size_t len; 1541 char *start, *end; 1542 1543 start = (char *)(dev_name + 1); 1544 1545 end = strchr(start, ']'); 1546 if (end == NULL) 1547 goto out_bad_devname; 1548 if (*(end + 1) != ':') 1549 goto out_bad_devname; 1550 1551 len = end - start; 1552 if (len > maxnamlen) 1553 goto out_hostname; 1554 1555 /* N.B. caller will free nfs_server.hostname in all cases */ 1556 *hostname = kstrndup(start, len, GFP_KERNEL); 1557 if (*hostname == NULL) 1558 goto out_nomem; 1559 1560 end += 2; 1561 len = strlen(end); 1562 if (len > maxpathlen) 1563 goto out_path; 1564 *export_path = kstrndup(end, len, GFP_KERNEL); 1565 if (!*export_path) 1566 goto out_nomem; 1567 1568 return 0; 1569 1570 out_bad_devname: 1571 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1572 return -EINVAL; 1573 1574 out_nomem: 1575 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1576 return -ENOMEM; 1577 1578 out_hostname: 1579 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1580 return -ENAMETOOLONG; 1581 1582 out_path: 1583 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1584 return -ENAMETOOLONG; 1585 } 1586 1587 /* 1588 * Split "dev_name" into "hostname:export_path". 1589 * 1590 * The leftmost colon demarks the split between the server's hostname 1591 * and the export path. If the hostname starts with a left square 1592 * bracket, then it may contain colons. 1593 * 1594 * Note: caller frees hostname and export path, even on error. 1595 */ 1596 static int nfs_parse_devname(const char *dev_name, 1597 char **hostname, size_t maxnamlen, 1598 char **export_path, size_t maxpathlen) 1599 { 1600 if (*dev_name == '[') 1601 return nfs_parse_protected_hostname(dev_name, 1602 hostname, maxnamlen, 1603 export_path, maxpathlen); 1604 1605 return nfs_parse_simple_hostname(dev_name, 1606 hostname, maxnamlen, 1607 export_path, maxpathlen); 1608 } 1609 1610 /* 1611 * Validate the NFS2/NFS3 mount data 1612 * - fills in the mount root filehandle 1613 * 1614 * For option strings, user space handles the following behaviors: 1615 * 1616 * + DNS: mapping server host name to IP address ("addr=" option) 1617 * 1618 * + failure mode: how to behave if a mount request can't be handled 1619 * immediately ("fg/bg" option) 1620 * 1621 * + retry: how often to retry a mount request ("retry=" option) 1622 * 1623 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1624 * mountproto=tcp after mountproto=udp, and so on 1625 */ 1626 static int nfs_validate_mount_data(void *options, 1627 struct nfs_parsed_mount_data *args, 1628 struct nfs_fh *mntfh, 1629 const char *dev_name) 1630 { 1631 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1632 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1633 1634 if (data == NULL) 1635 goto out_no_data; 1636 1637 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); 1638 args->rsize = NFS_MAX_FILE_IO_SIZE; 1639 args->wsize = NFS_MAX_FILE_IO_SIZE; 1640 args->acregmin = NFS_DEF_ACREGMIN; 1641 args->acregmax = NFS_DEF_ACREGMAX; 1642 args->acdirmin = NFS_DEF_ACDIRMIN; 1643 args->acdirmax = NFS_DEF_ACDIRMAX; 1644 args->mount_server.port = NFS_UNSPEC_PORT; 1645 args->nfs_server.port = NFS_UNSPEC_PORT; 1646 args->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1647 args->auth_flavors[0] = RPC_AUTH_UNIX; 1648 args->auth_flavor_len = 1; 1649 args->minorversion = 0; 1650 1651 switch (data->version) { 1652 case 1: 1653 data->namlen = 0; 1654 case 2: 1655 data->bsize = 0; 1656 case 3: 1657 if (data->flags & NFS_MOUNT_VER3) 1658 goto out_no_v3; 1659 data->root.size = NFS2_FHSIZE; 1660 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1661 case 4: 1662 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1663 goto out_no_sec; 1664 case 5: 1665 memset(data->context, 0, sizeof(data->context)); 1666 case 6: 1667 if (data->flags & NFS_MOUNT_VER3) { 1668 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1669 goto out_invalid_fh; 1670 mntfh->size = data->root.size; 1671 args->version = 3; 1672 } else { 1673 mntfh->size = NFS2_FHSIZE; 1674 args->version = 2; 1675 } 1676 1677 1678 memcpy(mntfh->data, data->root.data, mntfh->size); 1679 if (mntfh->size < sizeof(mntfh->data)) 1680 memset(mntfh->data + mntfh->size, 0, 1681 sizeof(mntfh->data) - mntfh->size); 1682 1683 /* 1684 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1685 * can deal with. 1686 */ 1687 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1688 args->rsize = data->rsize; 1689 args->wsize = data->wsize; 1690 args->timeo = data->timeo; 1691 args->retrans = data->retrans; 1692 args->acregmin = data->acregmin; 1693 args->acregmax = data->acregmax; 1694 args->acdirmin = data->acdirmin; 1695 args->acdirmax = data->acdirmax; 1696 1697 memcpy(sap, &data->addr, sizeof(data->addr)); 1698 args->nfs_server.addrlen = sizeof(data->addr); 1699 if (!nfs_verify_server_address(sap)) 1700 goto out_no_address; 1701 1702 if (!(data->flags & NFS_MOUNT_TCP)) 1703 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1704 /* N.B. caller will free nfs_server.hostname in all cases */ 1705 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1706 args->namlen = data->namlen; 1707 args->bsize = data->bsize; 1708 1709 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1710 args->auth_flavors[0] = data->pseudoflavor; 1711 if (!args->nfs_server.hostname) 1712 goto out_nomem; 1713 1714 /* 1715 * The legacy version 6 binary mount data from userspace has a 1716 * field used only to transport selinux information into the 1717 * the kernel. To continue to support that functionality we 1718 * have a touch of selinux knowledge here in the NFS code. The 1719 * userspace code converted context=blah to just blah so we are 1720 * converting back to the full string selinux understands. 1721 */ 1722 if (data->context[0]){ 1723 #ifdef CONFIG_SECURITY_SELINUX 1724 int rc; 1725 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1726 if (!opts_str) 1727 return -ENOMEM; 1728 strcpy(opts_str, "context="); 1729 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1730 strcat(opts_str, &data->context[0]); 1731 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1732 kfree(opts_str); 1733 if (rc) 1734 return rc; 1735 #else 1736 return -EINVAL; 1737 #endif 1738 } 1739 1740 break; 1741 default: { 1742 int status; 1743 1744 if (nfs_parse_mount_options((char *)options, args) == 0) 1745 return -EINVAL; 1746 1747 if (!nfs_verify_server_address(sap)) 1748 goto out_no_address; 1749 1750 if (args->version == 4) 1751 #ifdef CONFIG_NFS_V4 1752 return nfs4_validate_text_mount_data(options, 1753 args, dev_name); 1754 #else 1755 goto out_v4_not_compiled; 1756 #endif 1757 1758 nfs_set_default_port(sap, args->nfs_server.port, 0); 1759 1760 nfs_set_mount_transport_protocol(args); 1761 1762 status = nfs_parse_devname(dev_name, 1763 &args->nfs_server.hostname, 1764 PAGE_SIZE, 1765 &args->nfs_server.export_path, 1766 NFS_MAXPATHLEN); 1767 if (!status) 1768 status = nfs_try_mount(args, mntfh); 1769 1770 kfree(args->nfs_server.export_path); 1771 args->nfs_server.export_path = NULL; 1772 1773 if (status) 1774 return status; 1775 1776 break; 1777 } 1778 } 1779 1780 #ifndef CONFIG_NFS_V3 1781 if (args->flags & NFS_MOUNT_VER3) 1782 goto out_v3_not_compiled; 1783 #endif /* !CONFIG_NFS_V3 */ 1784 1785 return 0; 1786 1787 out_no_data: 1788 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1789 return -EINVAL; 1790 1791 out_no_v3: 1792 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1793 data->version); 1794 return -EINVAL; 1795 1796 out_no_sec: 1797 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1798 return -EINVAL; 1799 1800 #ifndef CONFIG_NFS_V3 1801 out_v3_not_compiled: 1802 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1803 return -EPROTONOSUPPORT; 1804 #endif /* !CONFIG_NFS_V3 */ 1805 1806 #ifndef CONFIG_NFS_V4 1807 out_v4_not_compiled: 1808 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1809 return -EPROTONOSUPPORT; 1810 #endif /* !CONFIG_NFS_V4 */ 1811 1812 out_nomem: 1813 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1814 return -ENOMEM; 1815 1816 out_no_address: 1817 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1818 return -EINVAL; 1819 1820 out_invalid_fh: 1821 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1822 return -EINVAL; 1823 } 1824 1825 static int 1826 nfs_compare_remount_data(struct nfs_server *nfss, 1827 struct nfs_parsed_mount_data *data) 1828 { 1829 if (data->flags != nfss->flags || 1830 data->rsize != nfss->rsize || 1831 data->wsize != nfss->wsize || 1832 data->retrans != nfss->client->cl_timeout->to_retries || 1833 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1834 data->acregmin != nfss->acregmin / HZ || 1835 data->acregmax != nfss->acregmax / HZ || 1836 data->acdirmin != nfss->acdirmin / HZ || 1837 data->acdirmax != nfss->acdirmax / HZ || 1838 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1839 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1840 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1841 data->nfs_server.addrlen) != 0) 1842 return -EINVAL; 1843 1844 return 0; 1845 } 1846 1847 static int 1848 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1849 { 1850 int error; 1851 struct nfs_server *nfss = sb->s_fs_info; 1852 struct nfs_parsed_mount_data *data; 1853 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1854 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1855 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1856 1857 /* 1858 * Userspace mount programs that send binary options generally send 1859 * them populated with default values. We have no way to know which 1860 * ones were explicitly specified. Fall back to legacy behavior and 1861 * just return success. 1862 */ 1863 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1864 (nfsvers <= 3 && (!options || (options->version >= 1 && 1865 options->version <= 6)))) 1866 return 0; 1867 1868 data = kzalloc(sizeof(*data), GFP_KERNEL); 1869 if (data == NULL) 1870 return -ENOMEM; 1871 1872 lock_kernel(); 1873 /* fill out struct with values from existing mount */ 1874 data->flags = nfss->flags; 1875 data->rsize = nfss->rsize; 1876 data->wsize = nfss->wsize; 1877 data->retrans = nfss->client->cl_timeout->to_retries; 1878 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1879 data->acregmin = nfss->acregmin / HZ; 1880 data->acregmax = nfss->acregmax / HZ; 1881 data->acdirmin = nfss->acdirmin / HZ; 1882 data->acdirmax = nfss->acdirmax / HZ; 1883 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1884 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1885 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1886 data->nfs_server.addrlen); 1887 1888 /* overwrite those values with any that were specified */ 1889 error = nfs_parse_mount_options((char *)options, data); 1890 if (error < 0) 1891 goto out; 1892 1893 /* compare new mount options with old ones */ 1894 error = nfs_compare_remount_data(nfss, data); 1895 out: 1896 kfree(data); 1897 unlock_kernel(); 1898 return error; 1899 } 1900 1901 /* 1902 * Initialise the common bits of the superblock 1903 */ 1904 static inline void nfs_initialise_sb(struct super_block *sb) 1905 { 1906 struct nfs_server *server = NFS_SB(sb); 1907 1908 sb->s_magic = NFS_SUPER_MAGIC; 1909 1910 /* We probably want something more informative here */ 1911 snprintf(sb->s_id, sizeof(sb->s_id), 1912 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1913 1914 if (sb->s_blocksize == 0) 1915 sb->s_blocksize = nfs_block_bits(server->wsize, 1916 &sb->s_blocksize_bits); 1917 1918 if (server->flags & NFS_MOUNT_NOAC) 1919 sb->s_flags |= MS_SYNCHRONOUS; 1920 1921 sb->s_bdi = &server->backing_dev_info; 1922 1923 nfs_super_set_maxbytes(sb, server->maxfilesize); 1924 } 1925 1926 /* 1927 * Finish setting up an NFS2/3 superblock 1928 */ 1929 static void nfs_fill_super(struct super_block *sb, 1930 struct nfs_parsed_mount_data *data) 1931 { 1932 struct nfs_server *server = NFS_SB(sb); 1933 1934 sb->s_blocksize_bits = 0; 1935 sb->s_blocksize = 0; 1936 if (data->bsize) 1937 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 1938 1939 if (server->flags & NFS_MOUNT_VER3) { 1940 /* The VFS shouldn't apply the umask to mode bits. We will do 1941 * so ourselves when necessary. 1942 */ 1943 sb->s_flags |= MS_POSIXACL; 1944 sb->s_time_gran = 1; 1945 } 1946 1947 sb->s_op = &nfs_sops; 1948 nfs_initialise_sb(sb); 1949 } 1950 1951 /* 1952 * Finish setting up a cloned NFS2/3 superblock 1953 */ 1954 static void nfs_clone_super(struct super_block *sb, 1955 const struct super_block *old_sb) 1956 { 1957 struct nfs_server *server = NFS_SB(sb); 1958 1959 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 1960 sb->s_blocksize = old_sb->s_blocksize; 1961 sb->s_maxbytes = old_sb->s_maxbytes; 1962 1963 if (server->flags & NFS_MOUNT_VER3) { 1964 /* The VFS shouldn't apply the umask to mode bits. We will do 1965 * so ourselves when necessary. 1966 */ 1967 sb->s_flags |= MS_POSIXACL; 1968 sb->s_time_gran = 1; 1969 } 1970 1971 sb->s_op = old_sb->s_op; 1972 nfs_initialise_sb(sb); 1973 } 1974 1975 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 1976 { 1977 const struct nfs_server *a = s->s_fs_info; 1978 const struct rpc_clnt *clnt_a = a->client; 1979 const struct rpc_clnt *clnt_b = b->client; 1980 1981 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 1982 goto Ebusy; 1983 if (a->nfs_client != b->nfs_client) 1984 goto Ebusy; 1985 if (a->flags != b->flags) 1986 goto Ebusy; 1987 if (a->wsize != b->wsize) 1988 goto Ebusy; 1989 if (a->rsize != b->rsize) 1990 goto Ebusy; 1991 if (a->acregmin != b->acregmin) 1992 goto Ebusy; 1993 if (a->acregmax != b->acregmax) 1994 goto Ebusy; 1995 if (a->acdirmin != b->acdirmin) 1996 goto Ebusy; 1997 if (a->acdirmax != b->acdirmax) 1998 goto Ebusy; 1999 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2000 goto Ebusy; 2001 return 1; 2002 Ebusy: 2003 return 0; 2004 } 2005 2006 struct nfs_sb_mountdata { 2007 struct nfs_server *server; 2008 int mntflags; 2009 }; 2010 2011 static int nfs_set_super(struct super_block *s, void *data) 2012 { 2013 struct nfs_sb_mountdata *sb_mntdata = data; 2014 struct nfs_server *server = sb_mntdata->server; 2015 int ret; 2016 2017 s->s_flags = sb_mntdata->mntflags; 2018 s->s_fs_info = server; 2019 ret = set_anon_super(s, server); 2020 if (ret == 0) 2021 server->s_dev = s->s_dev; 2022 return ret; 2023 } 2024 2025 static int nfs_compare_super_address(struct nfs_server *server1, 2026 struct nfs_server *server2) 2027 { 2028 struct sockaddr *sap1, *sap2; 2029 2030 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2031 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2032 2033 if (sap1->sa_family != sap2->sa_family) 2034 return 0; 2035 2036 switch (sap1->sa_family) { 2037 case AF_INET: { 2038 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2039 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2040 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2041 return 0; 2042 if (sin1->sin_port != sin2->sin_port) 2043 return 0; 2044 break; 2045 } 2046 case AF_INET6: { 2047 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2048 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2049 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2050 return 0; 2051 if (sin1->sin6_port != sin2->sin6_port) 2052 return 0; 2053 break; 2054 } 2055 default: 2056 return 0; 2057 } 2058 2059 return 1; 2060 } 2061 2062 static int nfs_compare_super(struct super_block *sb, void *data) 2063 { 2064 struct nfs_sb_mountdata *sb_mntdata = data; 2065 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2066 int mntflags = sb_mntdata->mntflags; 2067 2068 if (!nfs_compare_super_address(old, server)) 2069 return 0; 2070 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2071 if (old->flags & NFS_MOUNT_UNSHARED) 2072 return 0; 2073 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2074 return 0; 2075 return nfs_compare_mount_options(sb, server, mntflags); 2076 } 2077 2078 static int nfs_bdi_register(struct nfs_server *server) 2079 { 2080 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2081 } 2082 2083 static int nfs_get_sb(struct file_system_type *fs_type, 2084 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2085 { 2086 struct nfs_server *server = NULL; 2087 struct super_block *s; 2088 struct nfs_parsed_mount_data *data; 2089 struct nfs_fh *mntfh; 2090 struct dentry *mntroot; 2091 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2092 struct nfs_sb_mountdata sb_mntdata = { 2093 .mntflags = flags, 2094 }; 2095 int error = -ENOMEM; 2096 2097 data = kzalloc(sizeof(*data), GFP_KERNEL); 2098 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2099 if (data == NULL || mntfh == NULL) 2100 goto out_free_fh; 2101 2102 security_init_mnt_opts(&data->lsm_opts); 2103 2104 /* Validate the mount data */ 2105 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2106 if (error < 0) 2107 goto out; 2108 2109 #ifdef CONFIG_NFS_V4 2110 if (data->version == 4) { 2111 error = nfs4_try_mount(flags, dev_name, data, mnt); 2112 kfree(data->client_address); 2113 goto out; 2114 } 2115 #endif /* CONFIG_NFS_V4 */ 2116 2117 /* Get a volume representation */ 2118 server = nfs_create_server(data, mntfh); 2119 if (IS_ERR(server)) { 2120 error = PTR_ERR(server); 2121 goto out; 2122 } 2123 sb_mntdata.server = server; 2124 2125 if (server->flags & NFS_MOUNT_UNSHARED) 2126 compare_super = NULL; 2127 2128 /* Get a superblock - note that we may end up sharing one that already exists */ 2129 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2130 if (IS_ERR(s)) { 2131 error = PTR_ERR(s); 2132 goto out_err_nosb; 2133 } 2134 2135 if (s->s_fs_info != server) { 2136 nfs_free_server(server); 2137 server = NULL; 2138 } else { 2139 error = nfs_bdi_register(server); 2140 if (error) 2141 goto error_splat_super; 2142 } 2143 2144 if (!s->s_root) { 2145 /* initial superblock/root creation */ 2146 nfs_fill_super(s, data); 2147 nfs_fscache_get_super_cookie(s, data); 2148 } 2149 2150 mntroot = nfs_get_root(s, mntfh); 2151 if (IS_ERR(mntroot)) { 2152 error = PTR_ERR(mntroot); 2153 goto error_splat_super; 2154 } 2155 2156 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2157 if (error) 2158 goto error_splat_root; 2159 2160 s->s_flags |= MS_ACTIVE; 2161 mnt->mnt_sb = s; 2162 mnt->mnt_root = mntroot; 2163 error = 0; 2164 2165 out: 2166 kfree(data->nfs_server.hostname); 2167 kfree(data->mount_server.hostname); 2168 kfree(data->fscache_uniq); 2169 security_free_mnt_opts(&data->lsm_opts); 2170 out_free_fh: 2171 kfree(mntfh); 2172 kfree(data); 2173 return error; 2174 2175 out_err_nosb: 2176 nfs_free_server(server); 2177 goto out; 2178 2179 error_splat_root: 2180 dput(mntroot); 2181 error_splat_super: 2182 deactivate_locked_super(s); 2183 goto out; 2184 } 2185 2186 /* 2187 * Destroy an NFS2/3 superblock 2188 */ 2189 static void nfs_kill_super(struct super_block *s) 2190 { 2191 struct nfs_server *server = NFS_SB(s); 2192 2193 kill_anon_super(s); 2194 bdi_unregister(&server->backing_dev_info); 2195 nfs_fscache_release_super_cookie(s); 2196 nfs_free_server(server); 2197 } 2198 2199 /* 2200 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2201 */ 2202 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2203 const char *dev_name, void *raw_data, 2204 struct vfsmount *mnt) 2205 { 2206 struct nfs_clone_mount *data = raw_data; 2207 struct super_block *s; 2208 struct nfs_server *server; 2209 struct dentry *mntroot; 2210 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2211 struct nfs_sb_mountdata sb_mntdata = { 2212 .mntflags = flags, 2213 }; 2214 int error; 2215 2216 dprintk("--> nfs_xdev_get_sb()\n"); 2217 2218 /* create a new volume representation */ 2219 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2220 if (IS_ERR(server)) { 2221 error = PTR_ERR(server); 2222 goto out_err_noserver; 2223 } 2224 sb_mntdata.server = server; 2225 2226 if (server->flags & NFS_MOUNT_UNSHARED) 2227 compare_super = NULL; 2228 2229 /* Get a superblock - note that we may end up sharing one that already exists */ 2230 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2231 if (IS_ERR(s)) { 2232 error = PTR_ERR(s); 2233 goto out_err_nosb; 2234 } 2235 2236 if (s->s_fs_info != server) { 2237 nfs_free_server(server); 2238 server = NULL; 2239 } else { 2240 error = nfs_bdi_register(server); 2241 if (error) 2242 goto error_splat_super; 2243 } 2244 2245 if (!s->s_root) { 2246 /* initial superblock/root creation */ 2247 nfs_clone_super(s, data->sb); 2248 } 2249 2250 mntroot = nfs_get_root(s, data->fh); 2251 if (IS_ERR(mntroot)) { 2252 error = PTR_ERR(mntroot); 2253 goto error_splat_super; 2254 } 2255 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2256 dput(mntroot); 2257 error = -ESTALE; 2258 goto error_splat_super; 2259 } 2260 2261 s->s_flags |= MS_ACTIVE; 2262 mnt->mnt_sb = s; 2263 mnt->mnt_root = mntroot; 2264 2265 /* clone any lsm security options from the parent to the new sb */ 2266 security_sb_clone_mnt_opts(data->sb, s); 2267 2268 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2269 return 0; 2270 2271 out_err_nosb: 2272 nfs_free_server(server); 2273 out_err_noserver: 2274 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2275 return error; 2276 2277 error_splat_super: 2278 deactivate_locked_super(s); 2279 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2280 return error; 2281 } 2282 2283 #ifdef CONFIG_NFS_V4 2284 2285 /* 2286 * Finish setting up a cloned NFS4 superblock 2287 */ 2288 static void nfs4_clone_super(struct super_block *sb, 2289 const struct super_block *old_sb) 2290 { 2291 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2292 sb->s_blocksize = old_sb->s_blocksize; 2293 sb->s_maxbytes = old_sb->s_maxbytes; 2294 sb->s_time_gran = 1; 2295 sb->s_op = old_sb->s_op; 2296 nfs_initialise_sb(sb); 2297 } 2298 2299 /* 2300 * Set up an NFS4 superblock 2301 */ 2302 static void nfs4_fill_super(struct super_block *sb) 2303 { 2304 sb->s_time_gran = 1; 2305 sb->s_op = &nfs4_sops; 2306 nfs_initialise_sb(sb); 2307 } 2308 2309 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2310 { 2311 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2312 } 2313 2314 static int nfs4_validate_text_mount_data(void *options, 2315 struct nfs_parsed_mount_data *args, 2316 const char *dev_name) 2317 { 2318 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2319 2320 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT); 2321 2322 nfs_validate_transport_protocol(args); 2323 2324 nfs4_validate_mount_flags(args); 2325 2326 if (args->version != 4) { 2327 dfprintk(MOUNT, 2328 "NFS4: Illegal mount version\n"); 2329 return -EINVAL; 2330 } 2331 2332 if (args->auth_flavor_len > 1) { 2333 dfprintk(MOUNT, 2334 "NFS4: Too many RPC auth flavours specified\n"); 2335 return -EINVAL; 2336 } 2337 2338 if (args->client_address == NULL) { 2339 dfprintk(MOUNT, 2340 "NFS4: mount program didn't pass callback address\n"); 2341 return -EINVAL; 2342 } 2343 2344 return nfs_parse_devname(dev_name, 2345 &args->nfs_server.hostname, 2346 NFS4_MAXNAMLEN, 2347 &args->nfs_server.export_path, 2348 NFS4_MAXPATHLEN); 2349 } 2350 2351 /* 2352 * Validate NFSv4 mount options 2353 */ 2354 static int nfs4_validate_mount_data(void *options, 2355 struct nfs_parsed_mount_data *args, 2356 const char *dev_name) 2357 { 2358 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2359 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2360 char *c; 2361 2362 if (data == NULL) 2363 goto out_no_data; 2364 2365 args->rsize = NFS_MAX_FILE_IO_SIZE; 2366 args->wsize = NFS_MAX_FILE_IO_SIZE; 2367 args->acregmin = NFS_DEF_ACREGMIN; 2368 args->acregmax = NFS_DEF_ACREGMAX; 2369 args->acdirmin = NFS_DEF_ACDIRMIN; 2370 args->acdirmax = NFS_DEF_ACDIRMAX; 2371 args->nfs_server.port = NFS_UNSPEC_PORT; 2372 args->auth_flavors[0] = RPC_AUTH_UNIX; 2373 args->auth_flavor_len = 1; 2374 args->version = 4; 2375 args->minorversion = 0; 2376 2377 switch (data->version) { 2378 case 1: 2379 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2380 goto out_no_address; 2381 if (data->host_addrlen == 0) 2382 goto out_no_address; 2383 args->nfs_server.addrlen = data->host_addrlen; 2384 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2385 return -EFAULT; 2386 if (!nfs_verify_server_address(sap)) 2387 goto out_no_address; 2388 2389 if (data->auth_flavourlen) { 2390 if (data->auth_flavourlen > 1) 2391 goto out_inval_auth; 2392 if (copy_from_user(&args->auth_flavors[0], 2393 data->auth_flavours, 2394 sizeof(args->auth_flavors[0]))) 2395 return -EFAULT; 2396 } 2397 2398 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2399 if (IS_ERR(c)) 2400 return PTR_ERR(c); 2401 args->nfs_server.hostname = c; 2402 2403 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2404 if (IS_ERR(c)) 2405 return PTR_ERR(c); 2406 args->nfs_server.export_path = c; 2407 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2408 2409 c = strndup_user(data->client_addr.data, 16); 2410 if (IS_ERR(c)) 2411 return PTR_ERR(c); 2412 args->client_address = c; 2413 2414 /* 2415 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2416 * can deal with. 2417 */ 2418 2419 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2420 args->rsize = data->rsize; 2421 args->wsize = data->wsize; 2422 args->timeo = data->timeo; 2423 args->retrans = data->retrans; 2424 args->acregmin = data->acregmin; 2425 args->acregmax = data->acregmax; 2426 args->acdirmin = data->acdirmin; 2427 args->acdirmax = data->acdirmax; 2428 args->nfs_server.protocol = data->proto; 2429 nfs_validate_transport_protocol(args); 2430 2431 break; 2432 default: 2433 if (nfs_parse_mount_options((char *)options, args) == 0) 2434 return -EINVAL; 2435 2436 if (!nfs_verify_server_address(sap)) 2437 return -EINVAL; 2438 2439 return nfs4_validate_text_mount_data(options, args, dev_name); 2440 } 2441 2442 return 0; 2443 2444 out_no_data: 2445 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2446 return -EINVAL; 2447 2448 out_inval_auth: 2449 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2450 data->auth_flavourlen); 2451 return -EINVAL; 2452 2453 out_no_address: 2454 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2455 return -EINVAL; 2456 } 2457 2458 /* 2459 * Get the superblock for the NFS4 root partition 2460 */ 2461 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2462 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2463 { 2464 struct nfs_parsed_mount_data *data = raw_data; 2465 struct super_block *s; 2466 struct nfs_server *server; 2467 struct nfs_fh *mntfh; 2468 struct dentry *mntroot; 2469 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2470 struct nfs_sb_mountdata sb_mntdata = { 2471 .mntflags = flags, 2472 }; 2473 int error = -ENOMEM; 2474 2475 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2476 if (data == NULL || mntfh == NULL) 2477 goto out_free_fh; 2478 2479 security_init_mnt_opts(&data->lsm_opts); 2480 2481 /* Get a volume representation */ 2482 server = nfs4_create_server(data, mntfh); 2483 if (IS_ERR(server)) { 2484 error = PTR_ERR(server); 2485 goto out; 2486 } 2487 sb_mntdata.server = server; 2488 2489 if (server->flags & NFS4_MOUNT_UNSHARED) 2490 compare_super = NULL; 2491 2492 /* Get a superblock - note that we may end up sharing one that already exists */ 2493 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2494 if (IS_ERR(s)) { 2495 error = PTR_ERR(s); 2496 goto out_free; 2497 } 2498 2499 if (s->s_fs_info != server) { 2500 nfs_free_server(server); 2501 server = NULL; 2502 } else { 2503 error = nfs_bdi_register(server); 2504 if (error) 2505 goto error_splat_super; 2506 } 2507 2508 if (!s->s_root) { 2509 /* initial superblock/root creation */ 2510 nfs4_fill_super(s); 2511 nfs_fscache_get_super_cookie(s, data); 2512 } 2513 2514 mntroot = nfs4_get_root(s, mntfh); 2515 if (IS_ERR(mntroot)) { 2516 error = PTR_ERR(mntroot); 2517 goto error_splat_super; 2518 } 2519 2520 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2521 if (error) 2522 goto error_splat_root; 2523 2524 s->s_flags |= MS_ACTIVE; 2525 mnt->mnt_sb = s; 2526 mnt->mnt_root = mntroot; 2527 error = 0; 2528 2529 out: 2530 security_free_mnt_opts(&data->lsm_opts); 2531 out_free_fh: 2532 kfree(mntfh); 2533 return error; 2534 2535 out_free: 2536 nfs_free_server(server); 2537 goto out; 2538 2539 error_splat_root: 2540 dput(mntroot); 2541 error_splat_super: 2542 deactivate_locked_super(s); 2543 goto out; 2544 } 2545 2546 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2547 int flags, void *data, const char *hostname) 2548 { 2549 struct vfsmount *root_mnt; 2550 char *root_devname; 2551 size_t len; 2552 2553 len = strlen(hostname) + 3; 2554 root_devname = kmalloc(len, GFP_KERNEL); 2555 if (root_devname == NULL) 2556 return ERR_PTR(-ENOMEM); 2557 snprintf(root_devname, len, "%s:/", hostname); 2558 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2559 kfree(root_devname); 2560 return root_mnt; 2561 } 2562 2563 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2564 { 2565 char *page = (char *) __get_free_page(GFP_KERNEL); 2566 char *devname, *tmp; 2567 2568 if (page == NULL) 2569 return; 2570 devname = nfs_path(path->mnt->mnt_devname, 2571 path->mnt->mnt_root, path->dentry, 2572 page, PAGE_SIZE); 2573 if (devname == NULL) 2574 goto out_freepage; 2575 tmp = kstrdup(devname, GFP_KERNEL); 2576 if (tmp == NULL) 2577 goto out_freepage; 2578 kfree(mnt->mnt_devname); 2579 mnt->mnt_devname = tmp; 2580 out_freepage: 2581 free_page((unsigned long)page); 2582 } 2583 2584 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2585 const char *export_path, struct vfsmount *mnt_target) 2586 { 2587 struct mnt_namespace *ns_private; 2588 struct nameidata nd; 2589 struct super_block *s; 2590 int ret; 2591 2592 ns_private = create_mnt_ns(root_mnt); 2593 ret = PTR_ERR(ns_private); 2594 if (IS_ERR(ns_private)) 2595 goto out_mntput; 2596 2597 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2598 export_path, LOOKUP_FOLLOW, &nd); 2599 2600 put_mnt_ns(ns_private); 2601 2602 if (ret != 0) 2603 goto out_err; 2604 2605 s = nd.path.mnt->mnt_sb; 2606 atomic_inc(&s->s_active); 2607 mnt_target->mnt_sb = s; 2608 mnt_target->mnt_root = dget(nd.path.dentry); 2609 2610 /* Correct the device pathname */ 2611 nfs_fix_devname(&nd.path, mnt_target); 2612 2613 path_put(&nd.path); 2614 down_write(&s->s_umount); 2615 return 0; 2616 out_mntput: 2617 mntput(root_mnt); 2618 out_err: 2619 return ret; 2620 } 2621 2622 static int nfs4_try_mount(int flags, const char *dev_name, 2623 struct nfs_parsed_mount_data *data, 2624 struct vfsmount *mnt) 2625 { 2626 char *export_path; 2627 struct vfsmount *root_mnt; 2628 int error; 2629 2630 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2631 2632 export_path = data->nfs_server.export_path; 2633 data->nfs_server.export_path = "/"; 2634 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2635 data->nfs_server.hostname); 2636 data->nfs_server.export_path = export_path; 2637 2638 error = PTR_ERR(root_mnt); 2639 if (IS_ERR(root_mnt)) 2640 goto out; 2641 2642 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2643 2644 out: 2645 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2646 error != 0 ? " [error]" : ""); 2647 return error; 2648 } 2649 2650 /* 2651 * Get the superblock for an NFS4 mountpoint 2652 */ 2653 static int nfs4_get_sb(struct file_system_type *fs_type, 2654 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2655 { 2656 struct nfs_parsed_mount_data *data; 2657 int error = -ENOMEM; 2658 2659 data = kzalloc(sizeof(*data), GFP_KERNEL); 2660 if (data == NULL) 2661 goto out_free_data; 2662 2663 /* Validate the mount data */ 2664 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2665 if (error < 0) 2666 goto out; 2667 2668 error = nfs4_try_mount(flags, dev_name, data, mnt); 2669 2670 out: 2671 kfree(data->client_address); 2672 kfree(data->nfs_server.export_path); 2673 kfree(data->nfs_server.hostname); 2674 kfree(data->fscache_uniq); 2675 out_free_data: 2676 kfree(data); 2677 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2678 error != 0 ? " [error]" : ""); 2679 return error; 2680 } 2681 2682 static void nfs4_kill_super(struct super_block *sb) 2683 { 2684 struct nfs_server *server = NFS_SB(sb); 2685 2686 dprintk("--> %s\n", __func__); 2687 nfs_super_return_all_delegations(sb); 2688 kill_anon_super(sb); 2689 nfs4_renewd_prepare_shutdown(server); 2690 nfs_fscache_release_super_cookie(sb); 2691 nfs_free_server(server); 2692 dprintk("<-- %s\n", __func__); 2693 } 2694 2695 /* 2696 * Clone an NFS4 server record on xdev traversal (FSID-change) 2697 */ 2698 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2699 const char *dev_name, void *raw_data, 2700 struct vfsmount *mnt) 2701 { 2702 struct nfs_clone_mount *data = raw_data; 2703 struct super_block *s; 2704 struct nfs_server *server; 2705 struct dentry *mntroot; 2706 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2707 struct nfs_sb_mountdata sb_mntdata = { 2708 .mntflags = flags, 2709 }; 2710 int error; 2711 2712 dprintk("--> nfs4_xdev_get_sb()\n"); 2713 2714 /* create a new volume representation */ 2715 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2716 if (IS_ERR(server)) { 2717 error = PTR_ERR(server); 2718 goto out_err_noserver; 2719 } 2720 sb_mntdata.server = server; 2721 2722 if (server->flags & NFS4_MOUNT_UNSHARED) 2723 compare_super = NULL; 2724 2725 /* Get a superblock - note that we may end up sharing one that already exists */ 2726 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2727 if (IS_ERR(s)) { 2728 error = PTR_ERR(s); 2729 goto out_err_nosb; 2730 } 2731 2732 if (s->s_fs_info != server) { 2733 nfs_free_server(server); 2734 server = NULL; 2735 } else { 2736 error = nfs_bdi_register(server); 2737 if (error) 2738 goto error_splat_super; 2739 } 2740 2741 if (!s->s_root) { 2742 /* initial superblock/root creation */ 2743 nfs4_clone_super(s, data->sb); 2744 } 2745 2746 mntroot = nfs4_get_root(s, data->fh); 2747 if (IS_ERR(mntroot)) { 2748 error = PTR_ERR(mntroot); 2749 goto error_splat_super; 2750 } 2751 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2752 dput(mntroot); 2753 error = -ESTALE; 2754 goto error_splat_super; 2755 } 2756 2757 s->s_flags |= MS_ACTIVE; 2758 mnt->mnt_sb = s; 2759 mnt->mnt_root = mntroot; 2760 2761 security_sb_clone_mnt_opts(data->sb, s); 2762 2763 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 2764 return 0; 2765 2766 out_err_nosb: 2767 nfs_free_server(server); 2768 out_err_noserver: 2769 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2770 return error; 2771 2772 error_splat_super: 2773 deactivate_locked_super(s); 2774 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2775 return error; 2776 } 2777 2778 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2779 int flags, const char *dev_name, void *raw_data, 2780 struct vfsmount *mnt) 2781 { 2782 struct nfs_clone_mount *data = raw_data; 2783 struct super_block *s; 2784 struct nfs_server *server; 2785 struct dentry *mntroot; 2786 struct nfs_fh mntfh; 2787 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2788 struct nfs_sb_mountdata sb_mntdata = { 2789 .mntflags = flags, 2790 }; 2791 int error; 2792 2793 dprintk("--> nfs4_referral_get_sb()\n"); 2794 2795 /* create a new volume representation */ 2796 server = nfs4_create_referral_server(data, &mntfh); 2797 if (IS_ERR(server)) { 2798 error = PTR_ERR(server); 2799 goto out_err_noserver; 2800 } 2801 sb_mntdata.server = server; 2802 2803 if (server->flags & NFS4_MOUNT_UNSHARED) 2804 compare_super = NULL; 2805 2806 /* Get a superblock - note that we may end up sharing one that already exists */ 2807 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2808 if (IS_ERR(s)) { 2809 error = PTR_ERR(s); 2810 goto out_err_nosb; 2811 } 2812 2813 if (s->s_fs_info != server) { 2814 nfs_free_server(server); 2815 server = NULL; 2816 } else { 2817 error = nfs_bdi_register(server); 2818 if (error) 2819 goto error_splat_super; 2820 } 2821 2822 if (!s->s_root) { 2823 /* initial superblock/root creation */ 2824 nfs4_fill_super(s); 2825 } 2826 2827 mntroot = nfs4_get_root(s, &mntfh); 2828 if (IS_ERR(mntroot)) { 2829 error = PTR_ERR(mntroot); 2830 goto error_splat_super; 2831 } 2832 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2833 dput(mntroot); 2834 error = -ESTALE; 2835 goto error_splat_super; 2836 } 2837 2838 s->s_flags |= MS_ACTIVE; 2839 mnt->mnt_sb = s; 2840 mnt->mnt_root = mntroot; 2841 2842 security_sb_clone_mnt_opts(data->sb, s); 2843 2844 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2845 return 0; 2846 2847 out_err_nosb: 2848 nfs_free_server(server); 2849 out_err_noserver: 2850 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2851 return error; 2852 2853 error_splat_super: 2854 deactivate_locked_super(s); 2855 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2856 return error; 2857 } 2858 2859 /* 2860 * Create an NFS4 server record on referral traversal 2861 */ 2862 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 2863 int flags, const char *dev_name, void *raw_data, 2864 struct vfsmount *mnt) 2865 { 2866 struct nfs_clone_mount *data = raw_data; 2867 char *export_path; 2868 struct vfsmount *root_mnt; 2869 int error; 2870 2871 dprintk("--> nfs4_referral_get_sb()\n"); 2872 2873 export_path = data->mnt_path; 2874 data->mnt_path = "/"; 2875 2876 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2877 flags, data, data->hostname); 2878 data->mnt_path = export_path; 2879 2880 error = PTR_ERR(root_mnt); 2881 if (IS_ERR(root_mnt)) 2882 goto out; 2883 2884 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2885 out: 2886 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 2887 error != 0 ? " [error]" : ""); 2888 return error; 2889 } 2890 2891 #endif /* CONFIG_NFS_V4 */ 2892