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/addr.h> 35 #include <linux/sunrpc/stats.h> 36 #include <linux/sunrpc/metrics.h> 37 #include <linux/sunrpc/xprtsock.h> 38 #include <linux/sunrpc/xprtrdma.h> 39 #include <linux/nfs_fs.h> 40 #include <linux/nfs_mount.h> 41 #include <linux/nfs4_mount.h> 42 #include <linux/lockd/bind.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/namei.h> 46 #include <linux/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/slab.h> 50 #include <net/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <linux/nfs_xdr.h> 53 #include <linux/magic.h> 54 #include <linux/parser.h> 55 #include <linux/nsproxy.h> 56 #include <linux/rcupdate.h> 57 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 #include "nfs4session.h" 67 #include "pnfs.h" 68 #include "nfs.h" 69 70 #define NFSDBG_FACILITY NFSDBG_VFS 71 #define NFS_TEXT_DATA 1 72 73 #if IS_ENABLED(CONFIG_NFS_V3) 74 #define NFS_DEFAULT_VERSION 3 75 #else 76 #define NFS_DEFAULT_VERSION 2 77 #endif 78 79 enum { 80 /* Mount options that take no arguments */ 81 Opt_soft, Opt_hard, 82 Opt_posix, Opt_noposix, 83 Opt_cto, Opt_nocto, 84 Opt_ac, Opt_noac, 85 Opt_lock, Opt_nolock, 86 Opt_udp, Opt_tcp, Opt_rdma, 87 Opt_acl, Opt_noacl, 88 Opt_rdirplus, Opt_nordirplus, 89 Opt_sharecache, Opt_nosharecache, 90 Opt_resvport, Opt_noresvport, 91 Opt_fscache, Opt_nofscache, 92 Opt_migration, Opt_nomigration, 93 94 /* Mount options that take integer arguments */ 95 Opt_port, 96 Opt_rsize, Opt_wsize, Opt_bsize, 97 Opt_timeo, Opt_retrans, 98 Opt_acregmin, Opt_acregmax, 99 Opt_acdirmin, Opt_acdirmax, 100 Opt_actimeo, 101 Opt_namelen, 102 Opt_mountport, 103 Opt_mountvers, 104 Opt_minorversion, 105 106 /* Mount options that take string arguments */ 107 Opt_nfsvers, 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 109 Opt_addr, Opt_mountaddr, Opt_clientaddr, 110 Opt_lookupcache, 111 Opt_fscache_uniq, 112 Opt_local_lock, 113 114 /* Special mount options */ 115 Opt_userspace, Opt_deprecated, Opt_sloppy, 116 117 Opt_err 118 }; 119 120 static const match_table_t nfs_mount_option_tokens = { 121 { Opt_userspace, "bg" }, 122 { Opt_userspace, "fg" }, 123 { Opt_userspace, "retry=%s" }, 124 125 { Opt_sloppy, "sloppy" }, 126 127 { Opt_soft, "soft" }, 128 { Opt_hard, "hard" }, 129 { Opt_deprecated, "intr" }, 130 { Opt_deprecated, "nointr" }, 131 { Opt_posix, "posix" }, 132 { Opt_noposix, "noposix" }, 133 { Opt_cto, "cto" }, 134 { Opt_nocto, "nocto" }, 135 { Opt_ac, "ac" }, 136 { Opt_noac, "noac" }, 137 { Opt_lock, "lock" }, 138 { Opt_nolock, "nolock" }, 139 { Opt_udp, "udp" }, 140 { Opt_tcp, "tcp" }, 141 { Opt_rdma, "rdma" }, 142 { Opt_acl, "acl" }, 143 { Opt_noacl, "noacl" }, 144 { Opt_rdirplus, "rdirplus" }, 145 { Opt_nordirplus, "nordirplus" }, 146 { Opt_sharecache, "sharecache" }, 147 { Opt_nosharecache, "nosharecache" }, 148 { Opt_resvport, "resvport" }, 149 { Opt_noresvport, "noresvport" }, 150 { Opt_fscache, "fsc" }, 151 { Opt_nofscache, "nofsc" }, 152 { Opt_migration, "migration" }, 153 { Opt_nomigration, "nomigration" }, 154 155 { Opt_port, "port=%s" }, 156 { Opt_rsize, "rsize=%s" }, 157 { Opt_wsize, "wsize=%s" }, 158 { Opt_bsize, "bsize=%s" }, 159 { Opt_timeo, "timeo=%s" }, 160 { Opt_retrans, "retrans=%s" }, 161 { Opt_acregmin, "acregmin=%s" }, 162 { Opt_acregmax, "acregmax=%s" }, 163 { Opt_acdirmin, "acdirmin=%s" }, 164 { Opt_acdirmax, "acdirmax=%s" }, 165 { Opt_actimeo, "actimeo=%s" }, 166 { Opt_namelen, "namlen=%s" }, 167 { Opt_mountport, "mountport=%s" }, 168 { Opt_mountvers, "mountvers=%s" }, 169 { Opt_minorversion, "minorversion=%s" }, 170 171 { Opt_nfsvers, "nfsvers=%s" }, 172 { Opt_nfsvers, "vers=%s" }, 173 174 { Opt_sec, "sec=%s" }, 175 { Opt_proto, "proto=%s" }, 176 { Opt_mountproto, "mountproto=%s" }, 177 { Opt_addr, "addr=%s" }, 178 { Opt_clientaddr, "clientaddr=%s" }, 179 { Opt_mounthost, "mounthost=%s" }, 180 { Opt_mountaddr, "mountaddr=%s" }, 181 182 { Opt_lookupcache, "lookupcache=%s" }, 183 { Opt_fscache_uniq, "fsc=%s" }, 184 { Opt_local_lock, "local_lock=%s" }, 185 186 /* The following needs to be listed after all other options */ 187 { Opt_nfsvers, "v%s" }, 188 189 { Opt_err, NULL } 190 }; 191 192 enum { 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 194 195 Opt_xprt_err 196 }; 197 198 static const match_table_t nfs_xprt_protocol_tokens = { 199 { Opt_xprt_udp, "udp" }, 200 { Opt_xprt_udp6, "udp6" }, 201 { Opt_xprt_tcp, "tcp" }, 202 { Opt_xprt_tcp6, "tcp6" }, 203 { Opt_xprt_rdma, "rdma" }, 204 205 { Opt_xprt_err, NULL } 206 }; 207 208 enum { 209 Opt_sec_none, Opt_sec_sys, 210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 213 214 Opt_sec_err 215 }; 216 217 static const match_table_t nfs_secflavor_tokens = { 218 { Opt_sec_none, "none" }, 219 { Opt_sec_none, "null" }, 220 { Opt_sec_sys, "sys" }, 221 222 { Opt_sec_krb5, "krb5" }, 223 { Opt_sec_krb5i, "krb5i" }, 224 { Opt_sec_krb5p, "krb5p" }, 225 226 { Opt_sec_lkey, "lkey" }, 227 { Opt_sec_lkeyi, "lkeyi" }, 228 { Opt_sec_lkeyp, "lkeyp" }, 229 230 { Opt_sec_spkm, "spkm3" }, 231 { Opt_sec_spkmi, "spkm3i" }, 232 { Opt_sec_spkmp, "spkm3p" }, 233 234 { Opt_sec_err, NULL } 235 }; 236 237 enum { 238 Opt_lookupcache_all, Opt_lookupcache_positive, 239 Opt_lookupcache_none, 240 241 Opt_lookupcache_err 242 }; 243 244 static match_table_t nfs_lookupcache_tokens = { 245 { Opt_lookupcache_all, "all" }, 246 { Opt_lookupcache_positive, "pos" }, 247 { Opt_lookupcache_positive, "positive" }, 248 { Opt_lookupcache_none, "none" }, 249 250 { Opt_lookupcache_err, NULL } 251 }; 252 253 enum { 254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 255 Opt_local_lock_none, 256 257 Opt_local_lock_err 258 }; 259 260 static match_table_t nfs_local_lock_tokens = { 261 { Opt_local_lock_all, "all" }, 262 { Opt_local_lock_flock, "flock" }, 263 { Opt_local_lock_posix, "posix" }, 264 { Opt_local_lock_none, "none" }, 265 266 { Opt_local_lock_err, NULL } 267 }; 268 269 enum { 270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 271 Opt_vers_4_1, Opt_vers_4_2, 272 273 Opt_vers_err 274 }; 275 276 static match_table_t nfs_vers_tokens = { 277 { Opt_vers_2, "2" }, 278 { Opt_vers_3, "3" }, 279 { Opt_vers_4, "4" }, 280 { Opt_vers_4_0, "4.0" }, 281 { Opt_vers_4_1, "4.1" }, 282 { Opt_vers_4_2, "4.2" }, 283 284 { Opt_vers_err, NULL } 285 }; 286 287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 288 int flags, const char *dev_name, void *raw_data); 289 290 struct file_system_type nfs_fs_type = { 291 .owner = THIS_MODULE, 292 .name = "nfs", 293 .mount = nfs_fs_mount, 294 .kill_sb = nfs_kill_super, 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 296 }; 297 MODULE_ALIAS_FS("nfs"); 298 EXPORT_SYMBOL_GPL(nfs_fs_type); 299 300 struct file_system_type nfs_xdev_fs_type = { 301 .owner = THIS_MODULE, 302 .name = "nfs", 303 .mount = nfs_xdev_mount, 304 .kill_sb = nfs_kill_super, 305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 306 }; 307 308 const struct super_operations nfs_sops = { 309 .alloc_inode = nfs_alloc_inode, 310 .destroy_inode = nfs_destroy_inode, 311 .write_inode = nfs_write_inode, 312 .drop_inode = nfs_drop_inode, 313 .statfs = nfs_statfs, 314 .evict_inode = nfs_evict_inode, 315 .umount_begin = nfs_umount_begin, 316 .show_options = nfs_show_options, 317 .show_devname = nfs_show_devname, 318 .show_path = nfs_show_path, 319 .show_stats = nfs_show_stats, 320 .remount_fs = nfs_remount, 321 }; 322 EXPORT_SYMBOL_GPL(nfs_sops); 323 324 #if IS_ENABLED(CONFIG_NFS_V4) 325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 326 static int nfs4_validate_mount_data(void *options, 327 struct nfs_parsed_mount_data *args, const char *dev_name); 328 329 struct file_system_type nfs4_fs_type = { 330 .owner = THIS_MODULE, 331 .name = "nfs4", 332 .mount = nfs_fs_mount, 333 .kill_sb = nfs_kill_super, 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 335 }; 336 MODULE_ALIAS_FS("nfs4"); 337 MODULE_ALIAS("nfs4"); 338 EXPORT_SYMBOL_GPL(nfs4_fs_type); 339 340 static int __init register_nfs4_fs(void) 341 { 342 return register_filesystem(&nfs4_fs_type); 343 } 344 345 static void unregister_nfs4_fs(void) 346 { 347 unregister_filesystem(&nfs4_fs_type); 348 } 349 #else 350 static int __init register_nfs4_fs(void) 351 { 352 return 0; 353 } 354 355 static void unregister_nfs4_fs(void) 356 { 357 } 358 #endif 359 360 static struct shrinker acl_shrinker = { 361 .count_objects = nfs_access_cache_count, 362 .scan_objects = nfs_access_cache_scan, 363 .seeks = DEFAULT_SEEKS, 364 }; 365 366 /* 367 * Register the NFS filesystems 368 */ 369 int __init register_nfs_fs(void) 370 { 371 int ret; 372 373 ret = register_filesystem(&nfs_fs_type); 374 if (ret < 0) 375 goto error_0; 376 377 ret = register_nfs4_fs(); 378 if (ret < 0) 379 goto error_1; 380 381 ret = nfs_register_sysctl(); 382 if (ret < 0) 383 goto error_2; 384 ret = register_shrinker(&acl_shrinker); 385 if (ret < 0) 386 goto error_3; 387 return 0; 388 error_3: 389 nfs_unregister_sysctl(); 390 error_2: 391 unregister_nfs4_fs(); 392 error_1: 393 unregister_filesystem(&nfs_fs_type); 394 error_0: 395 return ret; 396 } 397 398 /* 399 * Unregister the NFS filesystems 400 */ 401 void __exit unregister_nfs_fs(void) 402 { 403 unregister_shrinker(&acl_shrinker); 404 nfs_unregister_sysctl(); 405 unregister_nfs4_fs(); 406 unregister_filesystem(&nfs_fs_type); 407 } 408 409 bool nfs_sb_active(struct super_block *sb) 410 { 411 struct nfs_server *server = NFS_SB(sb); 412 413 if (!atomic_inc_not_zero(&sb->s_active)) 414 return false; 415 if (atomic_inc_return(&server->active) != 1) 416 atomic_dec(&sb->s_active); 417 return true; 418 } 419 EXPORT_SYMBOL_GPL(nfs_sb_active); 420 421 void nfs_sb_deactive(struct super_block *sb) 422 { 423 struct nfs_server *server = NFS_SB(sb); 424 425 if (atomic_dec_and_test(&server->active)) 426 deactivate_super(sb); 427 } 428 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 429 430 /* 431 * Deliver file system statistics to userspace 432 */ 433 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 434 { 435 struct nfs_server *server = NFS_SB(dentry->d_sb); 436 unsigned char blockbits; 437 unsigned long blockres; 438 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 439 struct nfs_fsstat res; 440 int error = -ENOMEM; 441 442 res.fattr = nfs_alloc_fattr(); 443 if (res.fattr == NULL) 444 goto out_err; 445 446 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 447 if (unlikely(error == -ESTALE)) { 448 struct dentry *pd_dentry; 449 450 pd_dentry = dget_parent(dentry); 451 if (pd_dentry != NULL) { 452 nfs_zap_caches(d_inode(pd_dentry)); 453 dput(pd_dentry); 454 } 455 } 456 nfs_free_fattr(res.fattr); 457 if (error < 0) 458 goto out_err; 459 460 buf->f_type = NFS_SUPER_MAGIC; 461 462 /* 463 * Current versions of glibc do not correctly handle the 464 * case where f_frsize != f_bsize. Eventually we want to 465 * report the value of wtmult in this field. 466 */ 467 buf->f_frsize = dentry->d_sb->s_blocksize; 468 469 /* 470 * On most *nix systems, f_blocks, f_bfree, and f_bavail 471 * are reported in units of f_frsize. Linux hasn't had 472 * an f_frsize field in its statfs struct until recently, 473 * thus historically Linux's sys_statfs reports these 474 * fields in units of f_bsize. 475 */ 476 buf->f_bsize = dentry->d_sb->s_blocksize; 477 blockbits = dentry->d_sb->s_blocksize_bits; 478 blockres = (1 << blockbits) - 1; 479 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 480 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 481 buf->f_bavail = (res.abytes + blockres) >> blockbits; 482 483 buf->f_files = res.tfiles; 484 buf->f_ffree = res.afiles; 485 486 buf->f_namelen = server->namelen; 487 488 return 0; 489 490 out_err: 491 dprintk("%s: statfs error = %d\n", __func__, -error); 492 return error; 493 } 494 EXPORT_SYMBOL_GPL(nfs_statfs); 495 496 /* 497 * Map the security flavour number to a name 498 */ 499 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 500 { 501 static const struct { 502 rpc_authflavor_t flavour; 503 const char *str; 504 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 505 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 506 { RPC_AUTH_NULL, "null" }, 507 { RPC_AUTH_UNIX, "sys" }, 508 { RPC_AUTH_GSS_KRB5, "krb5" }, 509 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 510 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 511 { RPC_AUTH_GSS_LKEY, "lkey" }, 512 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 513 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 514 { RPC_AUTH_GSS_SPKM, "spkm" }, 515 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 516 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 517 { UINT_MAX, "unknown" } 518 }; 519 int i; 520 521 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 522 if (sec_flavours[i].flavour == flavour) 523 break; 524 } 525 return sec_flavours[i].str; 526 } 527 528 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 529 int showdefaults) 530 { 531 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 532 533 seq_printf(m, ",mountproto="); 534 switch (sap->sa_family) { 535 case AF_INET: 536 switch (nfss->mountd_protocol) { 537 case IPPROTO_UDP: 538 seq_printf(m, RPCBIND_NETID_UDP); 539 break; 540 case IPPROTO_TCP: 541 seq_printf(m, RPCBIND_NETID_TCP); 542 break; 543 default: 544 if (showdefaults) 545 seq_printf(m, "auto"); 546 } 547 break; 548 case AF_INET6: 549 switch (nfss->mountd_protocol) { 550 case IPPROTO_UDP: 551 seq_printf(m, RPCBIND_NETID_UDP6); 552 break; 553 case IPPROTO_TCP: 554 seq_printf(m, RPCBIND_NETID_TCP6); 555 break; 556 default: 557 if (showdefaults) 558 seq_printf(m, "auto"); 559 } 560 break; 561 default: 562 if (showdefaults) 563 seq_printf(m, "auto"); 564 } 565 } 566 567 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 568 int showdefaults) 569 { 570 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 571 572 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 573 return; 574 575 switch (sap->sa_family) { 576 case AF_INET: { 577 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 578 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 579 break; 580 } 581 case AF_INET6: { 582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 583 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 584 break; 585 } 586 default: 587 if (showdefaults) 588 seq_printf(m, ",mountaddr=unspecified"); 589 } 590 591 if (nfss->mountd_version || showdefaults) 592 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 593 if ((nfss->mountd_port && 594 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 595 showdefaults) 596 seq_printf(m, ",mountport=%u", nfss->mountd_port); 597 598 nfs_show_mountd_netid(m, nfss, showdefaults); 599 } 600 601 #if IS_ENABLED(CONFIG_NFS_V4) 602 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 603 int showdefaults) 604 { 605 struct nfs_client *clp = nfss->nfs_client; 606 607 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 608 } 609 #else 610 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 611 int showdefaults) 612 { 613 } 614 #endif 615 616 static void nfs_show_nfs_version(struct seq_file *m, 617 unsigned int version, 618 unsigned int minorversion) 619 { 620 seq_printf(m, ",vers=%u", version); 621 if (version == 4) 622 seq_printf(m, ".%u", minorversion); 623 } 624 625 /* 626 * Describe the mount options in force on this server representation 627 */ 628 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 629 int showdefaults) 630 { 631 static const struct proc_nfs_info { 632 int flag; 633 const char *str; 634 const char *nostr; 635 } nfs_info[] = { 636 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 637 { NFS_MOUNT_POSIX, ",posix", "" }, 638 { NFS_MOUNT_NOCTO, ",nocto", "" }, 639 { NFS_MOUNT_NOAC, ",noac", "" }, 640 { NFS_MOUNT_NONLM, ",nolock", "" }, 641 { NFS_MOUNT_NOACL, ",noacl", "" }, 642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 645 { 0, NULL, NULL } 646 }; 647 const struct proc_nfs_info *nfs_infop; 648 struct nfs_client *clp = nfss->nfs_client; 649 u32 version = clp->rpc_ops->version; 650 int local_flock, local_fcntl; 651 652 nfs_show_nfs_version(m, version, clp->cl_minorversion); 653 seq_printf(m, ",rsize=%u", nfss->rsize); 654 seq_printf(m, ",wsize=%u", nfss->wsize); 655 if (nfss->bsize != 0) 656 seq_printf(m, ",bsize=%u", nfss->bsize); 657 seq_printf(m, ",namlen=%u", nfss->namelen); 658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 667 if (nfss->flags & nfs_infop->flag) 668 seq_puts(m, nfs_infop->str); 669 else 670 seq_puts(m, nfs_infop->nostr); 671 } 672 rcu_read_lock(); 673 seq_printf(m, ",proto=%s", 674 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 675 rcu_read_unlock(); 676 if (version == 4) { 677 if (nfss->port != NFS_PORT) 678 seq_printf(m, ",port=%u", nfss->port); 679 } else 680 if (nfss->port) 681 seq_printf(m, ",port=%u", nfss->port); 682 683 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 684 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 685 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 686 687 if (version != 4) 688 nfs_show_mountd_options(m, nfss, showdefaults); 689 else 690 nfs_show_nfsv4_options(m, nfss, showdefaults); 691 692 if (nfss->options & NFS_OPTION_FSCACHE) 693 seq_printf(m, ",fsc"); 694 695 if (nfss->options & NFS_OPTION_MIGRATION) 696 seq_printf(m, ",migration"); 697 698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 700 seq_printf(m, ",lookupcache=none"); 701 else 702 seq_printf(m, ",lookupcache=pos"); 703 } 704 705 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 706 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 707 708 if (!local_flock && !local_fcntl) 709 seq_printf(m, ",local_lock=none"); 710 else if (local_flock && local_fcntl) 711 seq_printf(m, ",local_lock=all"); 712 else if (local_flock) 713 seq_printf(m, ",local_lock=flock"); 714 else 715 seq_printf(m, ",local_lock=posix"); 716 } 717 718 /* 719 * Describe the mount options on this VFS mountpoint 720 */ 721 int nfs_show_options(struct seq_file *m, struct dentry *root) 722 { 723 struct nfs_server *nfss = NFS_SB(root->d_sb); 724 725 nfs_show_mount_options(m, nfss, 0); 726 727 rcu_read_lock(); 728 seq_printf(m, ",addr=%s", 729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 730 RPC_DISPLAY_ADDR)); 731 rcu_read_unlock(); 732 733 return 0; 734 } 735 EXPORT_SYMBOL_GPL(nfs_show_options); 736 737 #if IS_ENABLED(CONFIG_NFS_V4) 738 #ifdef CONFIG_NFS_V4_1 739 static void show_sessions(struct seq_file *m, struct nfs_server *server) 740 { 741 if (nfs4_has_session(server->nfs_client)) 742 seq_printf(m, ",sessions"); 743 } 744 #else 745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 746 #endif 747 #endif 748 749 #ifdef CONFIG_NFS_V4_1 750 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 751 { 752 seq_printf(m, ",pnfs="); 753 if (server->pnfs_curr_ld) 754 seq_printf(m, "%s", server->pnfs_curr_ld->name); 755 else 756 seq_printf(m, "not configured"); 757 } 758 759 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 760 { 761 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 762 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 763 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 764 "date='%llu,%u'", 765 impl_id->name, impl_id->domain, 766 impl_id->date.seconds, impl_id->date.nseconds); 767 } 768 } 769 #else 770 #if IS_ENABLED(CONFIG_NFS_V4) 771 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 772 { 773 } 774 #endif 775 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 776 { 777 } 778 #endif 779 780 int nfs_show_devname(struct seq_file *m, struct dentry *root) 781 { 782 char *page = (char *) __get_free_page(GFP_KERNEL); 783 char *devname, *dummy; 784 int err = 0; 785 if (!page) 786 return -ENOMEM; 787 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 788 if (IS_ERR(devname)) 789 err = PTR_ERR(devname); 790 else 791 seq_escape(m, devname, " \t\n\\"); 792 free_page((unsigned long)page); 793 return err; 794 } 795 EXPORT_SYMBOL_GPL(nfs_show_devname); 796 797 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 798 { 799 seq_puts(m, "/"); 800 return 0; 801 } 802 EXPORT_SYMBOL_GPL(nfs_show_path); 803 804 /* 805 * Present statistical information for this VFS mountpoint 806 */ 807 int nfs_show_stats(struct seq_file *m, struct dentry *root) 808 { 809 int i, cpu; 810 struct nfs_server *nfss = NFS_SB(root->d_sb); 811 struct rpc_auth *auth = nfss->client->cl_auth; 812 struct nfs_iostats totals = { }; 813 814 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 815 816 /* 817 * Display all mount option settings 818 */ 819 seq_printf(m, "\n\topts:\t"); 820 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 821 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 822 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 823 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 824 nfs_show_mount_options(m, nfss, 1); 825 826 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 827 828 show_implementation_id(m, nfss); 829 830 seq_printf(m, "\n\tcaps:\t"); 831 seq_printf(m, "caps=0x%x", nfss->caps); 832 seq_printf(m, ",wtmult=%u", nfss->wtmult); 833 seq_printf(m, ",dtsize=%u", nfss->dtsize); 834 seq_printf(m, ",bsize=%u", nfss->bsize); 835 seq_printf(m, ",namlen=%u", nfss->namelen); 836 837 #if IS_ENABLED(CONFIG_NFS_V4) 838 if (nfss->nfs_client->rpc_ops->version == 4) { 839 seq_printf(m, "\n\tnfsv4:\t"); 840 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 841 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 842 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 843 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 844 show_sessions(m, nfss); 845 show_pnfs(m, nfss); 846 } 847 #endif 848 849 /* 850 * Display security flavor in effect for this mount 851 */ 852 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 853 if (auth->au_flavor) 854 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 855 856 /* 857 * Display superblock I/O counters 858 */ 859 for_each_possible_cpu(cpu) { 860 struct nfs_iostats *stats; 861 862 preempt_disable(); 863 stats = per_cpu_ptr(nfss->io_stats, cpu); 864 865 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 866 totals.events[i] += stats->events[i]; 867 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 868 totals.bytes[i] += stats->bytes[i]; 869 #ifdef CONFIG_NFS_FSCACHE 870 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 871 totals.fscache[i] += stats->fscache[i]; 872 #endif 873 874 preempt_enable(); 875 } 876 877 seq_printf(m, "\n\tevents:\t"); 878 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 879 seq_printf(m, "%lu ", totals.events[i]); 880 seq_printf(m, "\n\tbytes:\t"); 881 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 882 seq_printf(m, "%Lu ", totals.bytes[i]); 883 #ifdef CONFIG_NFS_FSCACHE 884 if (nfss->options & NFS_OPTION_FSCACHE) { 885 seq_printf(m, "\n\tfsc:\t"); 886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 887 seq_printf(m, "%Lu ", totals.bytes[i]); 888 } 889 #endif 890 seq_printf(m, "\n"); 891 892 rpc_print_iostats(m, nfss->client); 893 894 return 0; 895 } 896 EXPORT_SYMBOL_GPL(nfs_show_stats); 897 898 /* 899 * Begin unmount by attempting to remove all automounted mountpoints we added 900 * in response to xdev traversals and referrals 901 */ 902 void nfs_umount_begin(struct super_block *sb) 903 { 904 struct nfs_server *server; 905 struct rpc_clnt *rpc; 906 907 server = NFS_SB(sb); 908 /* -EIO all pending I/O */ 909 rpc = server->client_acl; 910 if (!IS_ERR(rpc)) 911 rpc_killall_tasks(rpc); 912 rpc = server->client; 913 if (!IS_ERR(rpc)) 914 rpc_killall_tasks(rpc); 915 } 916 EXPORT_SYMBOL_GPL(nfs_umount_begin); 917 918 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 919 { 920 struct nfs_parsed_mount_data *data; 921 922 data = kzalloc(sizeof(*data), GFP_KERNEL); 923 if (data) { 924 data->acregmin = NFS_DEF_ACREGMIN; 925 data->acregmax = NFS_DEF_ACREGMAX; 926 data->acdirmin = NFS_DEF_ACDIRMIN; 927 data->acdirmax = NFS_DEF_ACDIRMAX; 928 data->mount_server.port = NFS_UNSPEC_PORT; 929 data->nfs_server.port = NFS_UNSPEC_PORT; 930 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 931 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 932 data->minorversion = 0; 933 data->need_mount = true; 934 data->net = current->nsproxy->net_ns; 935 security_init_mnt_opts(&data->lsm_opts); 936 } 937 return data; 938 } 939 940 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 941 { 942 if (data) { 943 kfree(data->client_address); 944 kfree(data->mount_server.hostname); 945 kfree(data->nfs_server.export_path); 946 kfree(data->nfs_server.hostname); 947 kfree(data->fscache_uniq); 948 security_free_mnt_opts(&data->lsm_opts); 949 kfree(data); 950 } 951 } 952 953 /* 954 * Sanity-check a server address provided by the mount command. 955 * 956 * Address family must be initialized, and address must not be 957 * the ANY address for that family. 958 */ 959 static int nfs_verify_server_address(struct sockaddr *addr) 960 { 961 switch (addr->sa_family) { 962 case AF_INET: { 963 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 964 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 965 } 966 case AF_INET6: { 967 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 968 return !ipv6_addr_any(sa); 969 } 970 } 971 972 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 973 return 0; 974 } 975 976 /* 977 * Select between a default port value and a user-specified port value. 978 * If a zero value is set, then autobind will be used. 979 */ 980 static void nfs_set_port(struct sockaddr *sap, int *port, 981 const unsigned short default_port) 982 { 983 if (*port == NFS_UNSPEC_PORT) 984 *port = default_port; 985 986 rpc_set_port(sap, *port); 987 } 988 989 /* 990 * Sanity check the NFS transport protocol. 991 * 992 */ 993 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 994 { 995 switch (mnt->nfs_server.protocol) { 996 case XPRT_TRANSPORT_UDP: 997 case XPRT_TRANSPORT_TCP: 998 case XPRT_TRANSPORT_RDMA: 999 break; 1000 default: 1001 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1002 } 1003 } 1004 1005 /* 1006 * For text based NFSv2/v3 mounts, the mount protocol transport default 1007 * settings should depend upon the specified NFS transport. 1008 */ 1009 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1010 { 1011 nfs_validate_transport_protocol(mnt); 1012 1013 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1014 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1015 return; 1016 switch (mnt->nfs_server.protocol) { 1017 case XPRT_TRANSPORT_UDP: 1018 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1019 break; 1020 case XPRT_TRANSPORT_TCP: 1021 case XPRT_TRANSPORT_RDMA: 1022 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1023 } 1024 } 1025 1026 /* 1027 * Add 'flavor' to 'auth_info' if not already present. 1028 * Returns true if 'flavor' ends up in the list, false otherwise 1029 */ 1030 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1031 rpc_authflavor_t flavor) 1032 { 1033 unsigned int i; 1034 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1035 1036 /* make sure this flavor isn't already in the list */ 1037 for (i = 0; i < auth_info->flavor_len; i++) { 1038 if (flavor == auth_info->flavors[i]) 1039 return true; 1040 } 1041 1042 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1043 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1044 return false; 1045 } 1046 1047 auth_info->flavors[auth_info->flavor_len++] = flavor; 1048 return true; 1049 } 1050 1051 /* 1052 * Return true if 'match' is in auth_info or auth_info is empty. 1053 * Return false otherwise. 1054 */ 1055 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1056 rpc_authflavor_t match) 1057 { 1058 int i; 1059 1060 if (!auth_info->flavor_len) 1061 return true; 1062 1063 for (i = 0; i < auth_info->flavor_len; i++) { 1064 if (auth_info->flavors[i] == match) 1065 return true; 1066 } 1067 return false; 1068 } 1069 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1070 1071 /* 1072 * Parse the value of the 'sec=' option. 1073 */ 1074 static int nfs_parse_security_flavors(char *value, 1075 struct nfs_parsed_mount_data *mnt) 1076 { 1077 substring_t args[MAX_OPT_ARGS]; 1078 rpc_authflavor_t pseudoflavor; 1079 char *p; 1080 1081 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1082 1083 while ((p = strsep(&value, ":")) != NULL) { 1084 switch (match_token(p, nfs_secflavor_tokens, args)) { 1085 case Opt_sec_none: 1086 pseudoflavor = RPC_AUTH_NULL; 1087 break; 1088 case Opt_sec_sys: 1089 pseudoflavor = RPC_AUTH_UNIX; 1090 break; 1091 case Opt_sec_krb5: 1092 pseudoflavor = RPC_AUTH_GSS_KRB5; 1093 break; 1094 case Opt_sec_krb5i: 1095 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1096 break; 1097 case Opt_sec_krb5p: 1098 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1099 break; 1100 case Opt_sec_lkey: 1101 pseudoflavor = RPC_AUTH_GSS_LKEY; 1102 break; 1103 case Opt_sec_lkeyi: 1104 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1105 break; 1106 case Opt_sec_lkeyp: 1107 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1108 break; 1109 case Opt_sec_spkm: 1110 pseudoflavor = RPC_AUTH_GSS_SPKM; 1111 break; 1112 case Opt_sec_spkmi: 1113 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1114 break; 1115 case Opt_sec_spkmp: 1116 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1117 break; 1118 default: 1119 dfprintk(MOUNT, 1120 "NFS: sec= option '%s' not recognized\n", p); 1121 return 0; 1122 } 1123 1124 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1125 return 0; 1126 } 1127 1128 return 1; 1129 } 1130 1131 static int nfs_parse_version_string(char *string, 1132 struct nfs_parsed_mount_data *mnt, 1133 substring_t *args) 1134 { 1135 mnt->flags &= ~NFS_MOUNT_VER3; 1136 switch (match_token(string, nfs_vers_tokens, args)) { 1137 case Opt_vers_2: 1138 mnt->version = 2; 1139 break; 1140 case Opt_vers_3: 1141 mnt->flags |= NFS_MOUNT_VER3; 1142 mnt->version = 3; 1143 break; 1144 case Opt_vers_4: 1145 /* Backward compatibility option. In future, 1146 * the mount program should always supply 1147 * a NFSv4 minor version number. 1148 */ 1149 mnt->version = 4; 1150 break; 1151 case Opt_vers_4_0: 1152 mnt->version = 4; 1153 mnt->minorversion = 0; 1154 break; 1155 case Opt_vers_4_1: 1156 mnt->version = 4; 1157 mnt->minorversion = 1; 1158 break; 1159 case Opt_vers_4_2: 1160 mnt->version = 4; 1161 mnt->minorversion = 2; 1162 break; 1163 default: 1164 return 0; 1165 } 1166 return 1; 1167 } 1168 1169 static int nfs_get_option_str(substring_t args[], char **option) 1170 { 1171 kfree(*option); 1172 *option = match_strdup(args); 1173 return !*option; 1174 } 1175 1176 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1177 { 1178 int rc; 1179 char *string; 1180 1181 string = match_strdup(args); 1182 if (string == NULL) 1183 return -ENOMEM; 1184 rc = kstrtoul(string, 10, option); 1185 kfree(string); 1186 1187 return rc; 1188 } 1189 1190 /* 1191 * Error-check and convert a string of mount options from user space into 1192 * a data structure. The whole mount string is processed; bad options are 1193 * skipped as they are encountered. If there were no errors, return 1; 1194 * otherwise return 0 (zero). 1195 */ 1196 static int nfs_parse_mount_options(char *raw, 1197 struct nfs_parsed_mount_data *mnt) 1198 { 1199 char *p, *string, *secdata; 1200 int rc, sloppy = 0, invalid_option = 0; 1201 unsigned short protofamily = AF_UNSPEC; 1202 unsigned short mountfamily = AF_UNSPEC; 1203 1204 if (!raw) { 1205 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1206 return 1; 1207 } 1208 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1209 1210 secdata = alloc_secdata(); 1211 if (!secdata) 1212 goto out_nomem; 1213 1214 rc = security_sb_copy_data(raw, secdata); 1215 if (rc) 1216 goto out_security_failure; 1217 1218 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1219 if (rc) 1220 goto out_security_failure; 1221 1222 free_secdata(secdata); 1223 1224 while ((p = strsep(&raw, ",")) != NULL) { 1225 substring_t args[MAX_OPT_ARGS]; 1226 unsigned long option; 1227 int token; 1228 1229 if (!*p) 1230 continue; 1231 1232 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1233 1234 token = match_token(p, nfs_mount_option_tokens, args); 1235 switch (token) { 1236 1237 /* 1238 * boolean options: foo/nofoo 1239 */ 1240 case Opt_soft: 1241 mnt->flags |= NFS_MOUNT_SOFT; 1242 break; 1243 case Opt_hard: 1244 mnt->flags &= ~NFS_MOUNT_SOFT; 1245 break; 1246 case Opt_posix: 1247 mnt->flags |= NFS_MOUNT_POSIX; 1248 break; 1249 case Opt_noposix: 1250 mnt->flags &= ~NFS_MOUNT_POSIX; 1251 break; 1252 case Opt_cto: 1253 mnt->flags &= ~NFS_MOUNT_NOCTO; 1254 break; 1255 case Opt_nocto: 1256 mnt->flags |= NFS_MOUNT_NOCTO; 1257 break; 1258 case Opt_ac: 1259 mnt->flags &= ~NFS_MOUNT_NOAC; 1260 break; 1261 case Opt_noac: 1262 mnt->flags |= NFS_MOUNT_NOAC; 1263 break; 1264 case Opt_lock: 1265 mnt->flags &= ~NFS_MOUNT_NONLM; 1266 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1267 NFS_MOUNT_LOCAL_FCNTL); 1268 break; 1269 case Opt_nolock: 1270 mnt->flags |= NFS_MOUNT_NONLM; 1271 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1272 NFS_MOUNT_LOCAL_FCNTL); 1273 break; 1274 case Opt_udp: 1275 mnt->flags &= ~NFS_MOUNT_TCP; 1276 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1277 break; 1278 case Opt_tcp: 1279 mnt->flags |= NFS_MOUNT_TCP; 1280 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1281 break; 1282 case Opt_rdma: 1283 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1285 xprt_load_transport(p); 1286 break; 1287 case Opt_acl: 1288 mnt->flags &= ~NFS_MOUNT_NOACL; 1289 break; 1290 case Opt_noacl: 1291 mnt->flags |= NFS_MOUNT_NOACL; 1292 break; 1293 case Opt_rdirplus: 1294 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1295 break; 1296 case Opt_nordirplus: 1297 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1298 break; 1299 case Opt_sharecache: 1300 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1301 break; 1302 case Opt_nosharecache: 1303 mnt->flags |= NFS_MOUNT_UNSHARED; 1304 break; 1305 case Opt_resvport: 1306 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1307 break; 1308 case Opt_noresvport: 1309 mnt->flags |= NFS_MOUNT_NORESVPORT; 1310 break; 1311 case Opt_fscache: 1312 mnt->options |= NFS_OPTION_FSCACHE; 1313 kfree(mnt->fscache_uniq); 1314 mnt->fscache_uniq = NULL; 1315 break; 1316 case Opt_nofscache: 1317 mnt->options &= ~NFS_OPTION_FSCACHE; 1318 kfree(mnt->fscache_uniq); 1319 mnt->fscache_uniq = NULL; 1320 break; 1321 case Opt_migration: 1322 mnt->options |= NFS_OPTION_MIGRATION; 1323 break; 1324 case Opt_nomigration: 1325 mnt->options &= NFS_OPTION_MIGRATION; 1326 break; 1327 1328 /* 1329 * options that take numeric values 1330 */ 1331 case Opt_port: 1332 if (nfs_get_option_ul(args, &option) || 1333 option > USHRT_MAX) 1334 goto out_invalid_value; 1335 mnt->nfs_server.port = option; 1336 break; 1337 case Opt_rsize: 1338 if (nfs_get_option_ul(args, &option)) 1339 goto out_invalid_value; 1340 mnt->rsize = option; 1341 break; 1342 case Opt_wsize: 1343 if (nfs_get_option_ul(args, &option)) 1344 goto out_invalid_value; 1345 mnt->wsize = option; 1346 break; 1347 case Opt_bsize: 1348 if (nfs_get_option_ul(args, &option)) 1349 goto out_invalid_value; 1350 mnt->bsize = option; 1351 break; 1352 case Opt_timeo: 1353 if (nfs_get_option_ul(args, &option) || option == 0) 1354 goto out_invalid_value; 1355 mnt->timeo = option; 1356 break; 1357 case Opt_retrans: 1358 if (nfs_get_option_ul(args, &option) || option == 0) 1359 goto out_invalid_value; 1360 mnt->retrans = option; 1361 break; 1362 case Opt_acregmin: 1363 if (nfs_get_option_ul(args, &option)) 1364 goto out_invalid_value; 1365 mnt->acregmin = option; 1366 break; 1367 case Opt_acregmax: 1368 if (nfs_get_option_ul(args, &option)) 1369 goto out_invalid_value; 1370 mnt->acregmax = option; 1371 break; 1372 case Opt_acdirmin: 1373 if (nfs_get_option_ul(args, &option)) 1374 goto out_invalid_value; 1375 mnt->acdirmin = option; 1376 break; 1377 case Opt_acdirmax: 1378 if (nfs_get_option_ul(args, &option)) 1379 goto out_invalid_value; 1380 mnt->acdirmax = option; 1381 break; 1382 case Opt_actimeo: 1383 if (nfs_get_option_ul(args, &option)) 1384 goto out_invalid_value; 1385 mnt->acregmin = mnt->acregmax = 1386 mnt->acdirmin = mnt->acdirmax = option; 1387 break; 1388 case Opt_namelen: 1389 if (nfs_get_option_ul(args, &option)) 1390 goto out_invalid_value; 1391 mnt->namlen = option; 1392 break; 1393 case Opt_mountport: 1394 if (nfs_get_option_ul(args, &option) || 1395 option > USHRT_MAX) 1396 goto out_invalid_value; 1397 mnt->mount_server.port = option; 1398 break; 1399 case Opt_mountvers: 1400 if (nfs_get_option_ul(args, &option) || 1401 option < NFS_MNT_VERSION || 1402 option > NFS_MNT3_VERSION) 1403 goto out_invalid_value; 1404 mnt->mount_server.version = option; 1405 break; 1406 case Opt_minorversion: 1407 if (nfs_get_option_ul(args, &option)) 1408 goto out_invalid_value; 1409 if (option > NFS4_MAX_MINOR_VERSION) 1410 goto out_invalid_value; 1411 mnt->minorversion = option; 1412 break; 1413 1414 /* 1415 * options that take text values 1416 */ 1417 case Opt_nfsvers: 1418 string = match_strdup(args); 1419 if (string == NULL) 1420 goto out_nomem; 1421 rc = nfs_parse_version_string(string, mnt, args); 1422 kfree(string); 1423 if (!rc) 1424 goto out_invalid_value; 1425 break; 1426 case Opt_sec: 1427 string = match_strdup(args); 1428 if (string == NULL) 1429 goto out_nomem; 1430 rc = nfs_parse_security_flavors(string, mnt); 1431 kfree(string); 1432 if (!rc) { 1433 dfprintk(MOUNT, "NFS: unrecognized " 1434 "security flavor\n"); 1435 return 0; 1436 } 1437 break; 1438 case Opt_proto: 1439 string = match_strdup(args); 1440 if (string == NULL) 1441 goto out_nomem; 1442 token = match_token(string, 1443 nfs_xprt_protocol_tokens, args); 1444 1445 protofamily = AF_INET; 1446 switch (token) { 1447 case Opt_xprt_udp6: 1448 protofamily = AF_INET6; 1449 case Opt_xprt_udp: 1450 mnt->flags &= ~NFS_MOUNT_TCP; 1451 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1452 break; 1453 case Opt_xprt_tcp6: 1454 protofamily = AF_INET6; 1455 case Opt_xprt_tcp: 1456 mnt->flags |= NFS_MOUNT_TCP; 1457 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1458 break; 1459 case Opt_xprt_rdma: 1460 /* vector side protocols to TCP */ 1461 mnt->flags |= NFS_MOUNT_TCP; 1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1463 xprt_load_transport(string); 1464 break; 1465 default: 1466 dfprintk(MOUNT, "NFS: unrecognized " 1467 "transport protocol\n"); 1468 kfree(string); 1469 return 0; 1470 } 1471 kfree(string); 1472 break; 1473 case Opt_mountproto: 1474 string = match_strdup(args); 1475 if (string == NULL) 1476 goto out_nomem; 1477 token = match_token(string, 1478 nfs_xprt_protocol_tokens, args); 1479 kfree(string); 1480 1481 mountfamily = AF_INET; 1482 switch (token) { 1483 case Opt_xprt_udp6: 1484 mountfamily = AF_INET6; 1485 case Opt_xprt_udp: 1486 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1487 break; 1488 case Opt_xprt_tcp6: 1489 mountfamily = AF_INET6; 1490 case Opt_xprt_tcp: 1491 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1492 break; 1493 case Opt_xprt_rdma: /* not used for side protocols */ 1494 default: 1495 dfprintk(MOUNT, "NFS: unrecognized " 1496 "transport protocol\n"); 1497 return 0; 1498 } 1499 break; 1500 case Opt_addr: 1501 string = match_strdup(args); 1502 if (string == NULL) 1503 goto out_nomem; 1504 mnt->nfs_server.addrlen = 1505 rpc_pton(mnt->net, string, strlen(string), 1506 (struct sockaddr *) 1507 &mnt->nfs_server.address, 1508 sizeof(mnt->nfs_server.address)); 1509 kfree(string); 1510 if (mnt->nfs_server.addrlen == 0) 1511 goto out_invalid_address; 1512 break; 1513 case Opt_clientaddr: 1514 if (nfs_get_option_str(args, &mnt->client_address)) 1515 goto out_nomem; 1516 break; 1517 case Opt_mounthost: 1518 if (nfs_get_option_str(args, 1519 &mnt->mount_server.hostname)) 1520 goto out_nomem; 1521 break; 1522 case Opt_mountaddr: 1523 string = match_strdup(args); 1524 if (string == NULL) 1525 goto out_nomem; 1526 mnt->mount_server.addrlen = 1527 rpc_pton(mnt->net, string, strlen(string), 1528 (struct sockaddr *) 1529 &mnt->mount_server.address, 1530 sizeof(mnt->mount_server.address)); 1531 kfree(string); 1532 if (mnt->mount_server.addrlen == 0) 1533 goto out_invalid_address; 1534 break; 1535 case Opt_lookupcache: 1536 string = match_strdup(args); 1537 if (string == NULL) 1538 goto out_nomem; 1539 token = match_token(string, 1540 nfs_lookupcache_tokens, args); 1541 kfree(string); 1542 switch (token) { 1543 case Opt_lookupcache_all: 1544 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1545 break; 1546 case Opt_lookupcache_positive: 1547 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1548 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1549 break; 1550 case Opt_lookupcache_none: 1551 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1552 break; 1553 default: 1554 dfprintk(MOUNT, "NFS: invalid " 1555 "lookupcache argument\n"); 1556 return 0; 1557 }; 1558 break; 1559 case Opt_fscache_uniq: 1560 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1561 goto out_nomem; 1562 mnt->options |= NFS_OPTION_FSCACHE; 1563 break; 1564 case Opt_local_lock: 1565 string = match_strdup(args); 1566 if (string == NULL) 1567 goto out_nomem; 1568 token = match_token(string, nfs_local_lock_tokens, 1569 args); 1570 kfree(string); 1571 switch (token) { 1572 case Opt_local_lock_all: 1573 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1574 NFS_MOUNT_LOCAL_FCNTL); 1575 break; 1576 case Opt_local_lock_flock: 1577 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1578 break; 1579 case Opt_local_lock_posix: 1580 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1581 break; 1582 case Opt_local_lock_none: 1583 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1584 NFS_MOUNT_LOCAL_FCNTL); 1585 break; 1586 default: 1587 dfprintk(MOUNT, "NFS: invalid " 1588 "local_lock argument\n"); 1589 return 0; 1590 }; 1591 break; 1592 1593 /* 1594 * Special options 1595 */ 1596 case Opt_sloppy: 1597 sloppy = 1; 1598 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1599 break; 1600 case Opt_userspace: 1601 case Opt_deprecated: 1602 dfprintk(MOUNT, "NFS: ignoring mount option " 1603 "'%s'\n", p); 1604 break; 1605 1606 default: 1607 invalid_option = 1; 1608 dfprintk(MOUNT, "NFS: unrecognized mount option " 1609 "'%s'\n", p); 1610 } 1611 } 1612 1613 if (!sloppy && invalid_option) 1614 return 0; 1615 1616 if (mnt->minorversion && mnt->version != 4) 1617 goto out_minorversion_mismatch; 1618 1619 if (mnt->options & NFS_OPTION_MIGRATION && 1620 (mnt->version != 4 || mnt->minorversion != 0)) 1621 goto out_migration_misuse; 1622 1623 /* 1624 * verify that any proto=/mountproto= options match the address 1625 * families in the addr=/mountaddr= options. 1626 */ 1627 if (protofamily != AF_UNSPEC && 1628 protofamily != mnt->nfs_server.address.ss_family) 1629 goto out_proto_mismatch; 1630 1631 if (mountfamily != AF_UNSPEC) { 1632 if (mnt->mount_server.addrlen) { 1633 if (mountfamily != mnt->mount_server.address.ss_family) 1634 goto out_mountproto_mismatch; 1635 } else { 1636 if (mountfamily != mnt->nfs_server.address.ss_family) 1637 goto out_mountproto_mismatch; 1638 } 1639 } 1640 1641 return 1; 1642 1643 out_mountproto_mismatch: 1644 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1645 "option\n"); 1646 return 0; 1647 out_proto_mismatch: 1648 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1649 return 0; 1650 out_invalid_address: 1651 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1652 return 0; 1653 out_invalid_value: 1654 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1655 return 0; 1656 out_minorversion_mismatch: 1657 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1658 "minorversion=%u\n", mnt->version, mnt->minorversion); 1659 return 0; 1660 out_migration_misuse: 1661 printk(KERN_INFO 1662 "NFS: 'migration' not supported for this NFS version\n"); 1663 return 0; 1664 out_nomem: 1665 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1666 return 0; 1667 out_security_failure: 1668 free_secdata(secdata); 1669 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1670 return 0; 1671 } 1672 1673 /* 1674 * Ensure that a specified authtype in args->auth_info is supported by 1675 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1676 * -EACCES if not. 1677 */ 1678 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1679 rpc_authflavor_t *server_authlist, unsigned int count) 1680 { 1681 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1682 unsigned int i; 1683 1684 /* 1685 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1686 * must be in the list returned by the server. 1687 * 1688 * AUTH_NULL has a special meaning when it's in the server list - it 1689 * means that the server will ignore the rpc creds, so any flavor 1690 * can be used. 1691 */ 1692 for (i = 0; i < count; i++) { 1693 flavor = server_authlist[i]; 1694 1695 if (nfs_auth_info_match(&args->auth_info, flavor) || 1696 flavor == RPC_AUTH_NULL) 1697 goto out; 1698 } 1699 1700 dfprintk(MOUNT, 1701 "NFS: specified auth flavors not supported by server\n"); 1702 return -EACCES; 1703 1704 out: 1705 args->selected_flavor = flavor; 1706 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1707 return 0; 1708 } 1709 1710 /* 1711 * Use the remote server's MOUNT service to request the NFS file handle 1712 * corresponding to the provided path. 1713 */ 1714 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1715 struct nfs_fh *root_fh, 1716 rpc_authflavor_t *server_authlist, 1717 unsigned int *server_authlist_len) 1718 { 1719 struct nfs_mount_request request = { 1720 .sap = (struct sockaddr *) 1721 &args->mount_server.address, 1722 .dirpath = args->nfs_server.export_path, 1723 .protocol = args->mount_server.protocol, 1724 .fh = root_fh, 1725 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1726 .auth_flav_len = server_authlist_len, 1727 .auth_flavs = server_authlist, 1728 .net = args->net, 1729 }; 1730 int status; 1731 1732 if (args->mount_server.version == 0) { 1733 switch (args->version) { 1734 default: 1735 args->mount_server.version = NFS_MNT3_VERSION; 1736 break; 1737 case 2: 1738 args->mount_server.version = NFS_MNT_VERSION; 1739 } 1740 } 1741 request.version = args->mount_server.version; 1742 1743 if (args->mount_server.hostname) 1744 request.hostname = args->mount_server.hostname; 1745 else 1746 request.hostname = args->nfs_server.hostname; 1747 1748 /* 1749 * Construct the mount server's address. 1750 */ 1751 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1752 memcpy(request.sap, &args->nfs_server.address, 1753 args->nfs_server.addrlen); 1754 args->mount_server.addrlen = args->nfs_server.addrlen; 1755 } 1756 request.salen = args->mount_server.addrlen; 1757 nfs_set_port(request.sap, &args->mount_server.port, 0); 1758 1759 /* 1760 * Now ask the mount server to map our export path 1761 * to a file handle. 1762 */ 1763 status = nfs_mount(&request); 1764 if (status != 0) { 1765 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1766 request.hostname, status); 1767 return status; 1768 } 1769 1770 return 0; 1771 } 1772 1773 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1774 struct nfs_subversion *nfs_mod) 1775 { 1776 int status; 1777 unsigned int i; 1778 bool tried_auth_unix = false; 1779 bool auth_null_in_list = false; 1780 struct nfs_server *server = ERR_PTR(-EACCES); 1781 struct nfs_parsed_mount_data *args = mount_info->parsed; 1782 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1783 unsigned int authlist_len = ARRAY_SIZE(authlist); 1784 1785 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1786 &authlist_len); 1787 if (status) 1788 return ERR_PTR(status); 1789 1790 /* 1791 * Was a sec= authflavor specified in the options? First, verify 1792 * whether the server supports it, and then just try to use it if so. 1793 */ 1794 if (args->auth_info.flavor_len > 0) { 1795 status = nfs_verify_authflavors(args, authlist, authlist_len); 1796 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1797 args->selected_flavor); 1798 if (status) 1799 return ERR_PTR(status); 1800 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1801 } 1802 1803 /* 1804 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1805 * SHOULD prefer the flavor listed first. However, some servers list 1806 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1807 */ 1808 for (i = 0; i < authlist_len; ++i) { 1809 rpc_authflavor_t flavor; 1810 struct rpcsec_gss_info info; 1811 1812 flavor = authlist[i]; 1813 switch (flavor) { 1814 case RPC_AUTH_UNIX: 1815 tried_auth_unix = true; 1816 break; 1817 case RPC_AUTH_NULL: 1818 auth_null_in_list = true; 1819 continue; 1820 default: 1821 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1822 continue; 1823 /* Fallthrough */ 1824 } 1825 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1826 args->selected_flavor = flavor; 1827 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1828 if (!IS_ERR(server)) 1829 return server; 1830 } 1831 1832 /* 1833 * Nothing we tried so far worked. At this point, give up if we've 1834 * already tried AUTH_UNIX or if the server's list doesn't contain 1835 * AUTH_NULL 1836 */ 1837 if (tried_auth_unix || !auth_null_in_list) 1838 return server; 1839 1840 /* Last chance! Try AUTH_UNIX */ 1841 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1842 args->selected_flavor = RPC_AUTH_UNIX; 1843 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1844 } 1845 1846 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1847 struct nfs_mount_info *mount_info, 1848 struct nfs_subversion *nfs_mod) 1849 { 1850 struct nfs_server *server; 1851 1852 if (mount_info->parsed->need_mount) 1853 server = nfs_try_mount_request(mount_info, nfs_mod); 1854 else 1855 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1856 1857 if (IS_ERR(server)) 1858 return ERR_CAST(server); 1859 1860 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1861 } 1862 EXPORT_SYMBOL_GPL(nfs_try_mount); 1863 1864 /* 1865 * Split "dev_name" into "hostname:export_path". 1866 * 1867 * The leftmost colon demarks the split between the server's hostname 1868 * and the export path. If the hostname starts with a left square 1869 * bracket, then it may contain colons. 1870 * 1871 * Note: caller frees hostname and export path, even on error. 1872 */ 1873 static int nfs_parse_devname(const char *dev_name, 1874 char **hostname, size_t maxnamlen, 1875 char **export_path, size_t maxpathlen) 1876 { 1877 size_t len; 1878 char *end; 1879 1880 /* Is the host name protected with square brakcets? */ 1881 if (*dev_name == '[') { 1882 end = strchr(++dev_name, ']'); 1883 if (end == NULL || end[1] != ':') 1884 goto out_bad_devname; 1885 1886 len = end - dev_name; 1887 end++; 1888 } else { 1889 char *comma; 1890 1891 end = strchr(dev_name, ':'); 1892 if (end == NULL) 1893 goto out_bad_devname; 1894 len = end - dev_name; 1895 1896 /* kill possible hostname list: not supported */ 1897 comma = strchr(dev_name, ','); 1898 if (comma != NULL && comma < end) 1899 *comma = 0; 1900 } 1901 1902 if (len > maxnamlen) 1903 goto out_hostname; 1904 1905 /* N.B. caller will free nfs_server.hostname in all cases */ 1906 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1907 if (*hostname == NULL) 1908 goto out_nomem; 1909 len = strlen(++end); 1910 if (len > maxpathlen) 1911 goto out_path; 1912 *export_path = kstrndup(end, len, GFP_KERNEL); 1913 if (!*export_path) 1914 goto out_nomem; 1915 1916 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1917 return 0; 1918 1919 out_bad_devname: 1920 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1921 return -EINVAL; 1922 1923 out_nomem: 1924 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1925 return -ENOMEM; 1926 1927 out_hostname: 1928 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1929 return -ENAMETOOLONG; 1930 1931 out_path: 1932 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1933 return -ENAMETOOLONG; 1934 } 1935 1936 /* 1937 * Validate the NFS2/NFS3 mount data 1938 * - fills in the mount root filehandle 1939 * 1940 * For option strings, user space handles the following behaviors: 1941 * 1942 * + DNS: mapping server host name to IP address ("addr=" option) 1943 * 1944 * + failure mode: how to behave if a mount request can't be handled 1945 * immediately ("fg/bg" option) 1946 * 1947 * + retry: how often to retry a mount request ("retry=" option) 1948 * 1949 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1950 * mountproto=tcp after mountproto=udp, and so on 1951 */ 1952 static int nfs23_validate_mount_data(void *options, 1953 struct nfs_parsed_mount_data *args, 1954 struct nfs_fh *mntfh, 1955 const char *dev_name) 1956 { 1957 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1958 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1959 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1960 1961 if (data == NULL) 1962 goto out_no_data; 1963 1964 args->version = NFS_DEFAULT_VERSION; 1965 switch (data->version) { 1966 case 1: 1967 data->namlen = 0; 1968 case 2: 1969 data->bsize = 0; 1970 case 3: 1971 if (data->flags & NFS_MOUNT_VER3) 1972 goto out_no_v3; 1973 data->root.size = NFS2_FHSIZE; 1974 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1975 /* Turn off security negotiation */ 1976 extra_flags |= NFS_MOUNT_SECFLAVOUR; 1977 case 4: 1978 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1979 goto out_no_sec; 1980 case 5: 1981 memset(data->context, 0, sizeof(data->context)); 1982 case 6: 1983 if (data->flags & NFS_MOUNT_VER3) { 1984 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1985 goto out_invalid_fh; 1986 mntfh->size = data->root.size; 1987 args->version = 3; 1988 } else { 1989 mntfh->size = NFS2_FHSIZE; 1990 args->version = 2; 1991 } 1992 1993 1994 memcpy(mntfh->data, data->root.data, mntfh->size); 1995 if (mntfh->size < sizeof(mntfh->data)) 1996 memset(mntfh->data + mntfh->size, 0, 1997 sizeof(mntfh->data) - mntfh->size); 1998 1999 /* 2000 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2001 * can deal with. 2002 */ 2003 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2004 args->flags |= extra_flags; 2005 args->rsize = data->rsize; 2006 args->wsize = data->wsize; 2007 args->timeo = data->timeo; 2008 args->retrans = data->retrans; 2009 args->acregmin = data->acregmin; 2010 args->acregmax = data->acregmax; 2011 args->acdirmin = data->acdirmin; 2012 args->acdirmax = data->acdirmax; 2013 args->need_mount = false; 2014 2015 memcpy(sap, &data->addr, sizeof(data->addr)); 2016 args->nfs_server.addrlen = sizeof(data->addr); 2017 args->nfs_server.port = ntohs(data->addr.sin_port); 2018 if (!nfs_verify_server_address(sap)) 2019 goto out_no_address; 2020 2021 if (!(data->flags & NFS_MOUNT_TCP)) 2022 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2023 /* N.B. caller will free nfs_server.hostname in all cases */ 2024 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2025 args->namlen = data->namlen; 2026 args->bsize = data->bsize; 2027 2028 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2029 args->selected_flavor = data->pseudoflavor; 2030 else 2031 args->selected_flavor = RPC_AUTH_UNIX; 2032 if (!args->nfs_server.hostname) 2033 goto out_nomem; 2034 2035 if (!(data->flags & NFS_MOUNT_NONLM)) 2036 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2037 NFS_MOUNT_LOCAL_FCNTL); 2038 else 2039 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2040 NFS_MOUNT_LOCAL_FCNTL); 2041 /* 2042 * The legacy version 6 binary mount data from userspace has a 2043 * field used only to transport selinux information into the 2044 * the kernel. To continue to support that functionality we 2045 * have a touch of selinux knowledge here in the NFS code. The 2046 * userspace code converted context=blah to just blah so we are 2047 * converting back to the full string selinux understands. 2048 */ 2049 if (data->context[0]){ 2050 #ifdef CONFIG_SECURITY_SELINUX 2051 int rc; 2052 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 2053 if (!opts_str) 2054 return -ENOMEM; 2055 strcpy(opts_str, "context="); 2056 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2057 strcat(opts_str, &data->context[0]); 2058 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2059 kfree(opts_str); 2060 if (rc) 2061 return rc; 2062 #else 2063 return -EINVAL; 2064 #endif 2065 } 2066 2067 break; 2068 default: 2069 return NFS_TEXT_DATA; 2070 } 2071 2072 return 0; 2073 2074 out_no_data: 2075 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2076 return -EINVAL; 2077 2078 out_no_v3: 2079 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2080 data->version); 2081 return -EINVAL; 2082 2083 out_no_sec: 2084 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2085 return -EINVAL; 2086 2087 out_nomem: 2088 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2089 return -ENOMEM; 2090 2091 out_no_address: 2092 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2093 return -EINVAL; 2094 2095 out_invalid_fh: 2096 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2097 return -EINVAL; 2098 } 2099 2100 #if IS_ENABLED(CONFIG_NFS_V4) 2101 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2102 void *options, 2103 struct nfs_parsed_mount_data *args, 2104 struct nfs_fh *mntfh, 2105 const char *dev_name) 2106 { 2107 if (fs_type == &nfs_fs_type) 2108 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2109 return nfs4_validate_mount_data(options, args, dev_name); 2110 } 2111 #else 2112 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2113 void *options, 2114 struct nfs_parsed_mount_data *args, 2115 struct nfs_fh *mntfh, 2116 const char *dev_name) 2117 { 2118 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2119 } 2120 #endif 2121 2122 static int nfs_validate_text_mount_data(void *options, 2123 struct nfs_parsed_mount_data *args, 2124 const char *dev_name) 2125 { 2126 int port = 0; 2127 int max_namelen = PAGE_SIZE; 2128 int max_pathlen = NFS_MAXPATHLEN; 2129 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2130 2131 if (nfs_parse_mount_options((char *)options, args) == 0) 2132 return -EINVAL; 2133 2134 if (!nfs_verify_server_address(sap)) 2135 goto out_no_address; 2136 2137 if (args->version == 4) { 2138 #if IS_ENABLED(CONFIG_NFS_V4) 2139 port = NFS_PORT; 2140 max_namelen = NFS4_MAXNAMLEN; 2141 max_pathlen = NFS4_MAXPATHLEN; 2142 nfs_validate_transport_protocol(args); 2143 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2144 goto out_invalid_transport_udp; 2145 nfs4_validate_mount_flags(args); 2146 #else 2147 goto out_v4_not_compiled; 2148 #endif /* CONFIG_NFS_V4 */ 2149 } else 2150 nfs_set_mount_transport_protocol(args); 2151 2152 nfs_set_port(sap, &args->nfs_server.port, port); 2153 2154 return nfs_parse_devname(dev_name, 2155 &args->nfs_server.hostname, 2156 max_namelen, 2157 &args->nfs_server.export_path, 2158 max_pathlen); 2159 2160 #if !IS_ENABLED(CONFIG_NFS_V4) 2161 out_v4_not_compiled: 2162 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2163 return -EPROTONOSUPPORT; 2164 #else 2165 out_invalid_transport_udp: 2166 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2167 return -EINVAL; 2168 #endif /* !CONFIG_NFS_V4 */ 2169 2170 out_no_address: 2171 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2172 return -EINVAL; 2173 } 2174 2175 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2176 | NFS_MOUNT_SECURE \ 2177 | NFS_MOUNT_TCP \ 2178 | NFS_MOUNT_VER3 \ 2179 | NFS_MOUNT_KERBEROS \ 2180 | NFS_MOUNT_NONLM \ 2181 | NFS_MOUNT_BROKEN_SUID \ 2182 | NFS_MOUNT_STRICTLOCK \ 2183 | NFS_MOUNT_LEGACY_INTERFACE) 2184 2185 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2186 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2187 2188 static int 2189 nfs_compare_remount_data(struct nfs_server *nfss, 2190 struct nfs_parsed_mount_data *data) 2191 { 2192 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2193 data->rsize != nfss->rsize || 2194 data->wsize != nfss->wsize || 2195 data->version != nfss->nfs_client->rpc_ops->version || 2196 data->minorversion != nfss->nfs_client->cl_minorversion || 2197 data->retrans != nfss->client->cl_timeout->to_retries || 2198 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2199 data->acregmin != nfss->acregmin / HZ || 2200 data->acregmax != nfss->acregmax / HZ || 2201 data->acdirmin != nfss->acdirmin / HZ || 2202 data->acdirmax != nfss->acdirmax / HZ || 2203 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2204 data->nfs_server.port != nfss->port || 2205 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2206 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2207 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2208 return -EINVAL; 2209 2210 return 0; 2211 } 2212 2213 int 2214 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2215 { 2216 int error; 2217 struct nfs_server *nfss = sb->s_fs_info; 2218 struct nfs_parsed_mount_data *data; 2219 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2220 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2221 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2222 2223 sync_filesystem(sb); 2224 2225 /* 2226 * Userspace mount programs that send binary options generally send 2227 * them populated with default values. We have no way to know which 2228 * ones were explicitly specified. Fall back to legacy behavior and 2229 * just return success. 2230 */ 2231 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2232 (nfsvers <= 3 && (!options || (options->version >= 1 && 2233 options->version <= 6)))) 2234 return 0; 2235 2236 data = kzalloc(sizeof(*data), GFP_KERNEL); 2237 if (data == NULL) 2238 return -ENOMEM; 2239 2240 /* fill out struct with values from existing mount */ 2241 data->flags = nfss->flags; 2242 data->rsize = nfss->rsize; 2243 data->wsize = nfss->wsize; 2244 data->retrans = nfss->client->cl_timeout->to_retries; 2245 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2246 data->acregmin = nfss->acregmin / HZ; 2247 data->acregmax = nfss->acregmax / HZ; 2248 data->acdirmin = nfss->acdirmin / HZ; 2249 data->acdirmax = nfss->acdirmax / HZ; 2250 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2251 data->nfs_server.port = nfss->port; 2252 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2253 data->version = nfsvers; 2254 data->minorversion = nfss->nfs_client->cl_minorversion; 2255 data->net = current->nsproxy->net_ns; 2256 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2257 data->nfs_server.addrlen); 2258 2259 /* overwrite those values with any that were specified */ 2260 error = -EINVAL; 2261 if (!nfs_parse_mount_options((char *)options, data)) 2262 goto out; 2263 2264 /* 2265 * noac is a special case. It implies -o sync, but that's not 2266 * necessarily reflected in the mtab options. do_remount_sb 2267 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2268 * remount options, so we have to explicitly reset it. 2269 */ 2270 if (data->flags & NFS_MOUNT_NOAC) 2271 *flags |= MS_SYNCHRONOUS; 2272 2273 /* compare new mount options with old ones */ 2274 error = nfs_compare_remount_data(nfss, data); 2275 out: 2276 kfree(data); 2277 return error; 2278 } 2279 EXPORT_SYMBOL_GPL(nfs_remount); 2280 2281 /* 2282 * Initialise the common bits of the superblock 2283 */ 2284 inline void nfs_initialise_sb(struct super_block *sb) 2285 { 2286 struct nfs_server *server = NFS_SB(sb); 2287 2288 sb->s_magic = NFS_SUPER_MAGIC; 2289 2290 /* We probably want something more informative here */ 2291 snprintf(sb->s_id, sizeof(sb->s_id), 2292 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2293 2294 if (sb->s_blocksize == 0) 2295 sb->s_blocksize = nfs_block_bits(server->wsize, 2296 &sb->s_blocksize_bits); 2297 2298 sb->s_bdi = &server->backing_dev_info; 2299 2300 nfs_super_set_maxbytes(sb, server->maxfilesize); 2301 } 2302 2303 /* 2304 * Finish setting up an NFS2/3 superblock 2305 */ 2306 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2307 { 2308 struct nfs_parsed_mount_data *data = mount_info->parsed; 2309 struct nfs_server *server = NFS_SB(sb); 2310 2311 sb->s_blocksize_bits = 0; 2312 sb->s_blocksize = 0; 2313 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2314 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2315 if (data && data->bsize) 2316 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2317 2318 if (server->nfs_client->rpc_ops->version != 2) { 2319 /* The VFS shouldn't apply the umask to mode bits. We will do 2320 * so ourselves when necessary. 2321 */ 2322 sb->s_flags |= MS_POSIXACL; 2323 sb->s_time_gran = 1; 2324 } 2325 2326 nfs_initialise_sb(sb); 2327 } 2328 EXPORT_SYMBOL_GPL(nfs_fill_super); 2329 2330 /* 2331 * Finish setting up a cloned NFS2/3/4 superblock 2332 */ 2333 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2334 { 2335 const struct super_block *old_sb = mount_info->cloned->sb; 2336 struct nfs_server *server = NFS_SB(sb); 2337 2338 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2339 sb->s_blocksize = old_sb->s_blocksize; 2340 sb->s_maxbytes = old_sb->s_maxbytes; 2341 sb->s_xattr = old_sb->s_xattr; 2342 sb->s_op = old_sb->s_op; 2343 sb->s_time_gran = 1; 2344 2345 if (server->nfs_client->rpc_ops->version != 2) { 2346 /* The VFS shouldn't apply the umask to mode bits. We will do 2347 * so ourselves when necessary. 2348 */ 2349 sb->s_flags |= MS_POSIXACL; 2350 } 2351 2352 nfs_initialise_sb(sb); 2353 } 2354 2355 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2356 { 2357 const struct nfs_server *a = s->s_fs_info; 2358 const struct rpc_clnt *clnt_a = a->client; 2359 const struct rpc_clnt *clnt_b = b->client; 2360 2361 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2362 goto Ebusy; 2363 if (a->nfs_client != b->nfs_client) 2364 goto Ebusy; 2365 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2366 goto Ebusy; 2367 if (a->wsize != b->wsize) 2368 goto Ebusy; 2369 if (a->rsize != b->rsize) 2370 goto Ebusy; 2371 if (a->acregmin != b->acregmin) 2372 goto Ebusy; 2373 if (a->acregmax != b->acregmax) 2374 goto Ebusy; 2375 if (a->acdirmin != b->acdirmin) 2376 goto Ebusy; 2377 if (a->acdirmax != b->acdirmax) 2378 goto Ebusy; 2379 if (b->auth_info.flavor_len > 0 && 2380 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2381 goto Ebusy; 2382 return 1; 2383 Ebusy: 2384 return 0; 2385 } 2386 2387 struct nfs_sb_mountdata { 2388 struct nfs_server *server; 2389 int mntflags; 2390 }; 2391 2392 static int nfs_set_super(struct super_block *s, void *data) 2393 { 2394 struct nfs_sb_mountdata *sb_mntdata = data; 2395 struct nfs_server *server = sb_mntdata->server; 2396 int ret; 2397 2398 s->s_flags = sb_mntdata->mntflags; 2399 s->s_fs_info = server; 2400 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2401 ret = set_anon_super(s, server); 2402 if (ret == 0) 2403 server->s_dev = s->s_dev; 2404 return ret; 2405 } 2406 2407 static int nfs_compare_super_address(struct nfs_server *server1, 2408 struct nfs_server *server2) 2409 { 2410 struct sockaddr *sap1, *sap2; 2411 2412 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2413 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2414 2415 if (sap1->sa_family != sap2->sa_family) 2416 return 0; 2417 2418 switch (sap1->sa_family) { 2419 case AF_INET: { 2420 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2421 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2422 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2423 return 0; 2424 if (sin1->sin_port != sin2->sin_port) 2425 return 0; 2426 break; 2427 } 2428 case AF_INET6: { 2429 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2430 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2431 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2432 return 0; 2433 if (sin1->sin6_port != sin2->sin6_port) 2434 return 0; 2435 break; 2436 } 2437 default: 2438 return 0; 2439 } 2440 2441 return 1; 2442 } 2443 2444 static int nfs_compare_super(struct super_block *sb, void *data) 2445 { 2446 struct nfs_sb_mountdata *sb_mntdata = data; 2447 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2448 int mntflags = sb_mntdata->mntflags; 2449 2450 if (!nfs_compare_super_address(old, server)) 2451 return 0; 2452 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2453 if (old->flags & NFS_MOUNT_UNSHARED) 2454 return 0; 2455 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2456 return 0; 2457 return nfs_compare_mount_options(sb, server, mntflags); 2458 } 2459 2460 #ifdef CONFIG_NFS_FSCACHE 2461 static void nfs_get_cache_cookie(struct super_block *sb, 2462 struct nfs_parsed_mount_data *parsed, 2463 struct nfs_clone_mount *cloned) 2464 { 2465 struct nfs_server *nfss = NFS_SB(sb); 2466 char *uniq = NULL; 2467 int ulen = 0; 2468 2469 nfss->fscache_key = NULL; 2470 nfss->fscache = NULL; 2471 2472 if (parsed) { 2473 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2474 return; 2475 if (parsed->fscache_uniq) { 2476 uniq = parsed->fscache_uniq; 2477 ulen = strlen(parsed->fscache_uniq); 2478 } 2479 } else if (cloned) { 2480 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2481 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2482 return; 2483 if (mnt_s->fscache_key) { 2484 uniq = mnt_s->fscache_key->key.uniquifier; 2485 ulen = mnt_s->fscache_key->key.uniq_len; 2486 }; 2487 } else 2488 return; 2489 2490 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2491 } 2492 #else 2493 static void nfs_get_cache_cookie(struct super_block *sb, 2494 struct nfs_parsed_mount_data *parsed, 2495 struct nfs_clone_mount *cloned) 2496 { 2497 } 2498 #endif 2499 2500 static int nfs_bdi_register(struct nfs_server *server) 2501 { 2502 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2503 } 2504 2505 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2506 struct nfs_mount_info *mount_info) 2507 { 2508 int error; 2509 unsigned long kflags = 0, kflags_out = 0; 2510 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2511 kflags |= SECURITY_LSM_NATIVE_LABELS; 2512 2513 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2514 kflags, &kflags_out); 2515 if (error) 2516 goto err; 2517 2518 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2519 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2520 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2521 err: 2522 return error; 2523 } 2524 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2525 2526 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2527 struct nfs_mount_info *mount_info) 2528 { 2529 /* clone any lsm security options from the parent to the new sb */ 2530 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2531 return -ESTALE; 2532 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2533 } 2534 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2535 2536 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2537 int flags, const char *dev_name, 2538 struct nfs_mount_info *mount_info, 2539 struct nfs_subversion *nfs_mod) 2540 { 2541 struct super_block *s; 2542 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2543 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2544 struct nfs_sb_mountdata sb_mntdata = { 2545 .mntflags = flags, 2546 .server = server, 2547 }; 2548 int error; 2549 2550 if (server->flags & NFS_MOUNT_UNSHARED) 2551 compare_super = NULL; 2552 2553 /* -o noac implies -o sync */ 2554 if (server->flags & NFS_MOUNT_NOAC) 2555 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2556 2557 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2558 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2559 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2560 2561 /* Get a superblock - note that we may end up sharing one that already exists */ 2562 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2563 if (IS_ERR(s)) { 2564 mntroot = ERR_CAST(s); 2565 goto out_err_nosb; 2566 } 2567 2568 if (s->s_fs_info != server) { 2569 nfs_free_server(server); 2570 server = NULL; 2571 } else { 2572 error = nfs_bdi_register(server); 2573 if (error) { 2574 mntroot = ERR_PTR(error); 2575 goto error_splat_super; 2576 } 2577 server->super = s; 2578 } 2579 2580 if (!s->s_root) { 2581 /* initial superblock/root creation */ 2582 mount_info->fill_super(s, mount_info); 2583 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2584 } 2585 2586 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2587 if (IS_ERR(mntroot)) 2588 goto error_splat_super; 2589 2590 error = mount_info->set_security(s, mntroot, mount_info); 2591 if (error) 2592 goto error_splat_root; 2593 2594 s->s_flags |= MS_ACTIVE; 2595 2596 out: 2597 return mntroot; 2598 2599 out_err_nosb: 2600 nfs_free_server(server); 2601 goto out; 2602 2603 error_splat_root: 2604 dput(mntroot); 2605 mntroot = ERR_PTR(error); 2606 error_splat_super: 2607 deactivate_locked_super(s); 2608 goto out; 2609 } 2610 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2611 2612 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2613 int flags, const char *dev_name, void *raw_data) 2614 { 2615 struct nfs_mount_info mount_info = { 2616 .fill_super = nfs_fill_super, 2617 .set_security = nfs_set_sb_security, 2618 }; 2619 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2620 struct nfs_subversion *nfs_mod; 2621 int error; 2622 2623 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2624 mount_info.mntfh = nfs_alloc_fhandle(); 2625 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2626 goto out; 2627 2628 /* Validate the mount data */ 2629 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2630 if (error == NFS_TEXT_DATA) 2631 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2632 if (error < 0) { 2633 mntroot = ERR_PTR(error); 2634 goto out; 2635 } 2636 2637 nfs_mod = get_nfs_version(mount_info.parsed->version); 2638 if (IS_ERR(nfs_mod)) { 2639 mntroot = ERR_CAST(nfs_mod); 2640 goto out; 2641 } 2642 2643 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2644 2645 put_nfs_version(nfs_mod); 2646 out: 2647 nfs_free_parsed_mount_data(mount_info.parsed); 2648 nfs_free_fhandle(mount_info.mntfh); 2649 return mntroot; 2650 } 2651 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2652 2653 /* 2654 * Destroy an NFS2/3 superblock 2655 */ 2656 void nfs_kill_super(struct super_block *s) 2657 { 2658 struct nfs_server *server = NFS_SB(s); 2659 dev_t dev = s->s_dev; 2660 2661 generic_shutdown_super(s); 2662 2663 nfs_fscache_release_super_cookie(s); 2664 2665 nfs_free_server(server); 2666 free_anon_bdev(dev); 2667 } 2668 EXPORT_SYMBOL_GPL(nfs_kill_super); 2669 2670 /* 2671 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2672 */ 2673 static struct dentry * 2674 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2675 const char *dev_name, void *raw_data) 2676 { 2677 struct nfs_clone_mount *data = raw_data; 2678 struct nfs_mount_info mount_info = { 2679 .fill_super = nfs_clone_super, 2680 .set_security = nfs_clone_sb_security, 2681 .cloned = data, 2682 }; 2683 struct nfs_server *server; 2684 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2685 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2686 2687 dprintk("--> nfs_xdev_mount()\n"); 2688 2689 mount_info.mntfh = mount_info.cloned->fh; 2690 2691 /* create a new volume representation */ 2692 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2693 2694 if (IS_ERR(server)) 2695 mntroot = ERR_CAST(server); 2696 else 2697 mntroot = nfs_fs_mount_common(server, flags, 2698 dev_name, &mount_info, nfs_mod); 2699 2700 dprintk("<-- nfs_xdev_mount() = %ld\n", 2701 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2702 return mntroot; 2703 } 2704 2705 #if IS_ENABLED(CONFIG_NFS_V4) 2706 2707 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2708 { 2709 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2710 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2711 } 2712 2713 /* 2714 * Validate NFSv4 mount options 2715 */ 2716 static int nfs4_validate_mount_data(void *options, 2717 struct nfs_parsed_mount_data *args, 2718 const char *dev_name) 2719 { 2720 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2721 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2722 char *c; 2723 2724 if (data == NULL) 2725 goto out_no_data; 2726 2727 args->version = 4; 2728 2729 switch (data->version) { 2730 case 1: 2731 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2732 goto out_no_address; 2733 if (data->host_addrlen == 0) 2734 goto out_no_address; 2735 args->nfs_server.addrlen = data->host_addrlen; 2736 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2737 return -EFAULT; 2738 if (!nfs_verify_server_address(sap)) 2739 goto out_no_address; 2740 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2741 2742 if (data->auth_flavourlen) { 2743 rpc_authflavor_t pseudoflavor; 2744 if (data->auth_flavourlen > 1) 2745 goto out_inval_auth; 2746 if (copy_from_user(&pseudoflavor, 2747 data->auth_flavours, 2748 sizeof(pseudoflavor))) 2749 return -EFAULT; 2750 args->selected_flavor = pseudoflavor; 2751 } else 2752 args->selected_flavor = RPC_AUTH_UNIX; 2753 2754 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2755 if (IS_ERR(c)) 2756 return PTR_ERR(c); 2757 args->nfs_server.hostname = c; 2758 2759 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2760 if (IS_ERR(c)) 2761 return PTR_ERR(c); 2762 args->nfs_server.export_path = c; 2763 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2764 2765 c = strndup_user(data->client_addr.data, 16); 2766 if (IS_ERR(c)) 2767 return PTR_ERR(c); 2768 args->client_address = c; 2769 2770 /* 2771 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2772 * can deal with. 2773 */ 2774 2775 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2776 args->rsize = data->rsize; 2777 args->wsize = data->wsize; 2778 args->timeo = data->timeo; 2779 args->retrans = data->retrans; 2780 args->acregmin = data->acregmin; 2781 args->acregmax = data->acregmax; 2782 args->acdirmin = data->acdirmin; 2783 args->acdirmax = data->acdirmax; 2784 args->nfs_server.protocol = data->proto; 2785 nfs_validate_transport_protocol(args); 2786 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2787 goto out_invalid_transport_udp; 2788 2789 break; 2790 default: 2791 return NFS_TEXT_DATA; 2792 } 2793 2794 return 0; 2795 2796 out_no_data: 2797 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2798 return -EINVAL; 2799 2800 out_inval_auth: 2801 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2802 data->auth_flavourlen); 2803 return -EINVAL; 2804 2805 out_no_address: 2806 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2807 return -EINVAL; 2808 2809 out_invalid_transport_udp: 2810 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2811 return -EINVAL; 2812 } 2813 2814 /* 2815 * NFS v4 module parameters need to stay in the 2816 * NFS client for backwards compatibility 2817 */ 2818 unsigned int nfs_callback_set_tcpport; 2819 /* Default cache timeout is 10 minutes */ 2820 unsigned int nfs_idmap_cache_timeout = 600; 2821 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2822 bool nfs4_disable_idmapping = true; 2823 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2824 unsigned short send_implementation_id = 1; 2825 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2826 bool recover_lost_locks = false; 2827 2828 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2829 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2830 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2831 EXPORT_SYMBOL_GPL(max_session_slots); 2832 EXPORT_SYMBOL_GPL(send_implementation_id); 2833 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2834 EXPORT_SYMBOL_GPL(recover_lost_locks); 2835 2836 #define NFS_CALLBACK_MAXPORTNR (65535U) 2837 2838 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2839 { 2840 unsigned long num; 2841 int ret; 2842 2843 if (!val) 2844 return -EINVAL; 2845 ret = kstrtoul(val, 0, &num); 2846 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2847 return -EINVAL; 2848 *((unsigned int *)kp->arg) = num; 2849 return 0; 2850 } 2851 static const struct kernel_param_ops param_ops_portnr = { 2852 .set = param_set_portnr, 2853 .get = param_get_uint, 2854 }; 2855 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2856 2857 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2858 module_param(nfs_idmap_cache_timeout, int, 0644); 2859 module_param(nfs4_disable_idmapping, bool, 0644); 2860 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2861 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2862 MODULE_PARM_DESC(nfs4_disable_idmapping, 2863 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2864 module_param(max_session_slots, ushort, 0644); 2865 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2866 "requests the client will negotiate"); 2867 module_param(send_implementation_id, ushort, 0644); 2868 MODULE_PARM_DESC(send_implementation_id, 2869 "Send implementation ID with NFSv4.1 exchange_id"); 2870 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2871 2872 module_param(recover_lost_locks, bool, 0644); 2873 MODULE_PARM_DESC(recover_lost_locks, 2874 "If the server reports that a lock might be lost, " 2875 "try to recover it risking data corruption."); 2876 2877 2878 #endif /* CONFIG_NFS_V4 */ 2879