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/seq_file.h> 43 #include <linux/mount.h> 44 #include <linux/namei.h> 45 #include <linux/nfs_idmap.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 "pnfs.h" 67 #include "nfs.h" 68 69 #define NFSDBG_FACILITY NFSDBG_VFS 70 #define NFS_TEXT_DATA 1 71 72 #if IS_ENABLED(CONFIG_NFS_V3) 73 #define NFS_DEFAULT_VERSION 3 74 #else 75 #define NFS_DEFAULT_VERSION 2 76 #endif 77 78 enum { 79 /* Mount options that take no arguments */ 80 Opt_soft, Opt_hard, 81 Opt_posix, Opt_noposix, 82 Opt_cto, Opt_nocto, 83 Opt_ac, Opt_noac, 84 Opt_lock, Opt_nolock, 85 Opt_udp, Opt_tcp, Opt_rdma, 86 Opt_acl, Opt_noacl, 87 Opt_rdirplus, Opt_nordirplus, 88 Opt_sharecache, Opt_nosharecache, 89 Opt_resvport, Opt_noresvport, 90 Opt_fscache, Opt_nofscache, 91 92 /* Mount options that take integer arguments */ 93 Opt_port, 94 Opt_rsize, Opt_wsize, Opt_bsize, 95 Opt_timeo, Opt_retrans, 96 Opt_acregmin, Opt_acregmax, 97 Opt_acdirmin, Opt_acdirmax, 98 Opt_actimeo, 99 Opt_namelen, 100 Opt_mountport, 101 Opt_mountvers, 102 Opt_minorversion, 103 104 /* Mount options that take string arguments */ 105 Opt_nfsvers, 106 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 107 Opt_addr, Opt_mountaddr, Opt_clientaddr, 108 Opt_lookupcache, 109 Opt_fscache_uniq, 110 Opt_local_lock, 111 112 /* Special mount options */ 113 Opt_userspace, Opt_deprecated, Opt_sloppy, 114 115 Opt_err 116 }; 117 118 static const match_table_t nfs_mount_option_tokens = { 119 { Opt_userspace, "bg" }, 120 { Opt_userspace, "fg" }, 121 { Opt_userspace, "retry=%s" }, 122 123 { Opt_sloppy, "sloppy" }, 124 125 { Opt_soft, "soft" }, 126 { Opt_hard, "hard" }, 127 { Opt_deprecated, "intr" }, 128 { Opt_deprecated, "nointr" }, 129 { Opt_posix, "posix" }, 130 { Opt_noposix, "noposix" }, 131 { Opt_cto, "cto" }, 132 { Opt_nocto, "nocto" }, 133 { Opt_ac, "ac" }, 134 { Opt_noac, "noac" }, 135 { Opt_lock, "lock" }, 136 { Opt_nolock, "nolock" }, 137 { Opt_udp, "udp" }, 138 { Opt_tcp, "tcp" }, 139 { Opt_rdma, "rdma" }, 140 { Opt_acl, "acl" }, 141 { Opt_noacl, "noacl" }, 142 { Opt_rdirplus, "rdirplus" }, 143 { Opt_nordirplus, "nordirplus" }, 144 { Opt_sharecache, "sharecache" }, 145 { Opt_nosharecache, "nosharecache" }, 146 { Opt_resvport, "resvport" }, 147 { Opt_noresvport, "noresvport" }, 148 { Opt_fscache, "fsc" }, 149 { Opt_nofscache, "nofsc" }, 150 151 { Opt_port, "port=%s" }, 152 { Opt_rsize, "rsize=%s" }, 153 { Opt_wsize, "wsize=%s" }, 154 { Opt_bsize, "bsize=%s" }, 155 { Opt_timeo, "timeo=%s" }, 156 { Opt_retrans, "retrans=%s" }, 157 { Opt_acregmin, "acregmin=%s" }, 158 { Opt_acregmax, "acregmax=%s" }, 159 { Opt_acdirmin, "acdirmin=%s" }, 160 { Opt_acdirmax, "acdirmax=%s" }, 161 { Opt_actimeo, "actimeo=%s" }, 162 { Opt_namelen, "namlen=%s" }, 163 { Opt_mountport, "mountport=%s" }, 164 { Opt_mountvers, "mountvers=%s" }, 165 { Opt_minorversion, "minorversion=%s" }, 166 167 { Opt_nfsvers, "nfsvers=%s" }, 168 { Opt_nfsvers, "vers=%s" }, 169 170 { Opt_sec, "sec=%s" }, 171 { Opt_proto, "proto=%s" }, 172 { Opt_mountproto, "mountproto=%s" }, 173 { Opt_addr, "addr=%s" }, 174 { Opt_clientaddr, "clientaddr=%s" }, 175 { Opt_mounthost, "mounthost=%s" }, 176 { Opt_mountaddr, "mountaddr=%s" }, 177 178 { Opt_lookupcache, "lookupcache=%s" }, 179 { Opt_fscache_uniq, "fsc=%s" }, 180 { Opt_local_lock, "local_lock=%s" }, 181 182 /* The following needs to be listed after all other options */ 183 { Opt_nfsvers, "v%s" }, 184 185 { Opt_err, NULL } 186 }; 187 188 enum { 189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 190 191 Opt_xprt_err 192 }; 193 194 static const match_table_t nfs_xprt_protocol_tokens = { 195 { Opt_xprt_udp, "udp" }, 196 { Opt_xprt_udp6, "udp6" }, 197 { Opt_xprt_tcp, "tcp" }, 198 { Opt_xprt_tcp6, "tcp6" }, 199 { Opt_xprt_rdma, "rdma" }, 200 201 { Opt_xprt_err, NULL } 202 }; 203 204 enum { 205 Opt_sec_none, Opt_sec_sys, 206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 209 210 Opt_sec_err 211 }; 212 213 static const match_table_t nfs_secflavor_tokens = { 214 { Opt_sec_none, "none" }, 215 { Opt_sec_none, "null" }, 216 { Opt_sec_sys, "sys" }, 217 218 { Opt_sec_krb5, "krb5" }, 219 { Opt_sec_krb5i, "krb5i" }, 220 { Opt_sec_krb5p, "krb5p" }, 221 222 { Opt_sec_lkey, "lkey" }, 223 { Opt_sec_lkeyi, "lkeyi" }, 224 { Opt_sec_lkeyp, "lkeyp" }, 225 226 { Opt_sec_spkm, "spkm3" }, 227 { Opt_sec_spkmi, "spkm3i" }, 228 { Opt_sec_spkmp, "spkm3p" }, 229 230 { Opt_sec_err, NULL } 231 }; 232 233 enum { 234 Opt_lookupcache_all, Opt_lookupcache_positive, 235 Opt_lookupcache_none, 236 237 Opt_lookupcache_err 238 }; 239 240 static match_table_t nfs_lookupcache_tokens = { 241 { Opt_lookupcache_all, "all" }, 242 { Opt_lookupcache_positive, "pos" }, 243 { Opt_lookupcache_positive, "positive" }, 244 { Opt_lookupcache_none, "none" }, 245 246 { Opt_lookupcache_err, NULL } 247 }; 248 249 enum { 250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 251 Opt_local_lock_none, 252 253 Opt_local_lock_err 254 }; 255 256 static match_table_t nfs_local_lock_tokens = { 257 { Opt_local_lock_all, "all" }, 258 { Opt_local_lock_flock, "flock" }, 259 { Opt_local_lock_posix, "posix" }, 260 { Opt_local_lock_none, "none" }, 261 262 { Opt_local_lock_err, NULL } 263 }; 264 265 enum { 266 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 267 Opt_vers_4_1, 268 269 Opt_vers_err 270 }; 271 272 static match_table_t nfs_vers_tokens = { 273 { Opt_vers_2, "2" }, 274 { Opt_vers_3, "3" }, 275 { Opt_vers_4, "4" }, 276 { Opt_vers_4_0, "4.0" }, 277 { Opt_vers_4_1, "4.1" }, 278 279 { Opt_vers_err, NULL } 280 }; 281 282 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 283 int flags, const char *dev_name, void *raw_data); 284 285 struct file_system_type nfs_fs_type = { 286 .owner = THIS_MODULE, 287 .name = "nfs", 288 .mount = nfs_fs_mount, 289 .kill_sb = nfs_kill_super, 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 291 }; 292 EXPORT_SYMBOL_GPL(nfs_fs_type); 293 294 struct file_system_type nfs_xdev_fs_type = { 295 .owner = THIS_MODULE, 296 .name = "nfs", 297 .mount = nfs_xdev_mount, 298 .kill_sb = nfs_kill_super, 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 300 }; 301 302 const struct super_operations nfs_sops = { 303 .alloc_inode = nfs_alloc_inode, 304 .destroy_inode = nfs_destroy_inode, 305 .write_inode = nfs_write_inode, 306 .put_super = nfs_put_super, 307 .statfs = nfs_statfs, 308 .evict_inode = nfs_evict_inode, 309 .umount_begin = nfs_umount_begin, 310 .show_options = nfs_show_options, 311 .show_devname = nfs_show_devname, 312 .show_path = nfs_show_path, 313 .show_stats = nfs_show_stats, 314 .remount_fs = nfs_remount, 315 }; 316 EXPORT_SYMBOL_GPL(nfs_sops); 317 318 #if IS_ENABLED(CONFIG_NFS_V4) 319 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 320 static int nfs4_validate_mount_data(void *options, 321 struct nfs_parsed_mount_data *args, const char *dev_name); 322 #endif 323 324 static struct shrinker acl_shrinker = { 325 .shrink = nfs_access_cache_shrinker, 326 .seeks = DEFAULT_SEEKS, 327 }; 328 329 /* 330 * Register the NFS filesystems 331 */ 332 int __init register_nfs_fs(void) 333 { 334 int ret; 335 336 ret = register_filesystem(&nfs_fs_type); 337 if (ret < 0) 338 goto error_0; 339 340 ret = nfs_register_sysctl(); 341 if (ret < 0) 342 goto error_1; 343 register_shrinker(&acl_shrinker); 344 return 0; 345 346 error_1: 347 unregister_filesystem(&nfs_fs_type); 348 error_0: 349 return ret; 350 } 351 352 /* 353 * Unregister the NFS filesystems 354 */ 355 void __exit unregister_nfs_fs(void) 356 { 357 unregister_shrinker(&acl_shrinker); 358 nfs_unregister_sysctl(); 359 unregister_filesystem(&nfs_fs_type); 360 } 361 362 void nfs_sb_active(struct super_block *sb) 363 { 364 struct nfs_server *server = NFS_SB(sb); 365 366 if (atomic_inc_return(&server->active) == 1) 367 atomic_inc(&sb->s_active); 368 } 369 EXPORT_SYMBOL_GPL(nfs_sb_active); 370 371 void nfs_sb_deactive(struct super_block *sb) 372 { 373 struct nfs_server *server = NFS_SB(sb); 374 375 if (atomic_dec_and_test(&server->active)) 376 deactivate_super(sb); 377 } 378 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 379 380 /* 381 * Deliver file system statistics to userspace 382 */ 383 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 384 { 385 struct nfs_server *server = NFS_SB(dentry->d_sb); 386 unsigned char blockbits; 387 unsigned long blockres; 388 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 389 struct nfs_fsstat res; 390 int error = -ENOMEM; 391 392 res.fattr = nfs_alloc_fattr(); 393 if (res.fattr == NULL) 394 goto out_err; 395 396 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 397 if (unlikely(error == -ESTALE)) { 398 struct dentry *pd_dentry; 399 400 pd_dentry = dget_parent(dentry); 401 if (pd_dentry != NULL) { 402 nfs_zap_caches(pd_dentry->d_inode); 403 dput(pd_dentry); 404 } 405 } 406 nfs_free_fattr(res.fattr); 407 if (error < 0) 408 goto out_err; 409 410 buf->f_type = NFS_SUPER_MAGIC; 411 412 /* 413 * Current versions of glibc do not correctly handle the 414 * case where f_frsize != f_bsize. Eventually we want to 415 * report the value of wtmult in this field. 416 */ 417 buf->f_frsize = dentry->d_sb->s_blocksize; 418 419 /* 420 * On most *nix systems, f_blocks, f_bfree, and f_bavail 421 * are reported in units of f_frsize. Linux hasn't had 422 * an f_frsize field in its statfs struct until recently, 423 * thus historically Linux's sys_statfs reports these 424 * fields in units of f_bsize. 425 */ 426 buf->f_bsize = dentry->d_sb->s_blocksize; 427 blockbits = dentry->d_sb->s_blocksize_bits; 428 blockres = (1 << blockbits) - 1; 429 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 430 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 431 buf->f_bavail = (res.abytes + blockres) >> blockbits; 432 433 buf->f_files = res.tfiles; 434 buf->f_ffree = res.afiles; 435 436 buf->f_namelen = server->namelen; 437 438 return 0; 439 440 out_err: 441 dprintk("%s: statfs error = %d\n", __func__, -error); 442 return error; 443 } 444 EXPORT_SYMBOL_GPL(nfs_statfs); 445 446 /* 447 * Map the security flavour number to a name 448 */ 449 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 450 { 451 static const struct { 452 rpc_authflavor_t flavour; 453 const char *str; 454 } sec_flavours[] = { 455 { RPC_AUTH_NULL, "null" }, 456 { RPC_AUTH_UNIX, "sys" }, 457 { RPC_AUTH_GSS_KRB5, "krb5" }, 458 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 459 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 460 { RPC_AUTH_GSS_LKEY, "lkey" }, 461 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 462 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 463 { RPC_AUTH_GSS_SPKM, "spkm" }, 464 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 465 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 466 { UINT_MAX, "unknown" } 467 }; 468 int i; 469 470 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 471 if (sec_flavours[i].flavour == flavour) 472 break; 473 } 474 return sec_flavours[i].str; 475 } 476 477 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 478 int showdefaults) 479 { 480 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 481 482 seq_printf(m, ",mountproto="); 483 switch (sap->sa_family) { 484 case AF_INET: 485 switch (nfss->mountd_protocol) { 486 case IPPROTO_UDP: 487 seq_printf(m, RPCBIND_NETID_UDP); 488 break; 489 case IPPROTO_TCP: 490 seq_printf(m, RPCBIND_NETID_TCP); 491 break; 492 default: 493 if (showdefaults) 494 seq_printf(m, "auto"); 495 } 496 break; 497 case AF_INET6: 498 switch (nfss->mountd_protocol) { 499 case IPPROTO_UDP: 500 seq_printf(m, RPCBIND_NETID_UDP6); 501 break; 502 case IPPROTO_TCP: 503 seq_printf(m, RPCBIND_NETID_TCP6); 504 break; 505 default: 506 if (showdefaults) 507 seq_printf(m, "auto"); 508 } 509 break; 510 default: 511 if (showdefaults) 512 seq_printf(m, "auto"); 513 } 514 } 515 516 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 517 int showdefaults) 518 { 519 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 520 521 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 522 return; 523 524 switch (sap->sa_family) { 525 case AF_INET: { 526 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 527 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 528 break; 529 } 530 case AF_INET6: { 531 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 532 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 533 break; 534 } 535 default: 536 if (showdefaults) 537 seq_printf(m, ",mountaddr=unspecified"); 538 } 539 540 if (nfss->mountd_version || showdefaults) 541 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 542 if ((nfss->mountd_port && 543 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 544 showdefaults) 545 seq_printf(m, ",mountport=%u", nfss->mountd_port); 546 547 nfs_show_mountd_netid(m, nfss, showdefaults); 548 } 549 550 #if IS_ENABLED(CONFIG_NFS_V4) 551 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 552 int showdefaults) 553 { 554 struct nfs_client *clp = nfss->nfs_client; 555 556 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 557 } 558 #else 559 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 560 int showdefaults) 561 { 562 } 563 #endif 564 565 static void nfs_show_nfs_version(struct seq_file *m, 566 unsigned int version, 567 unsigned int minorversion) 568 { 569 seq_printf(m, ",vers=%u", version); 570 if (version == 4) 571 seq_printf(m, ".%u", minorversion); 572 } 573 574 /* 575 * Describe the mount options in force on this server representation 576 */ 577 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 578 int showdefaults) 579 { 580 static const struct proc_nfs_info { 581 int flag; 582 const char *str; 583 const char *nostr; 584 } nfs_info[] = { 585 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 586 { NFS_MOUNT_POSIX, ",posix", "" }, 587 { NFS_MOUNT_NOCTO, ",nocto", "" }, 588 { NFS_MOUNT_NOAC, ",noac", "" }, 589 { NFS_MOUNT_NONLM, ",nolock", "" }, 590 { NFS_MOUNT_NOACL, ",noacl", "" }, 591 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 592 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 593 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 594 { 0, NULL, NULL } 595 }; 596 const struct proc_nfs_info *nfs_infop; 597 struct nfs_client *clp = nfss->nfs_client; 598 u32 version = clp->rpc_ops->version; 599 int local_flock, local_fcntl; 600 601 nfs_show_nfs_version(m, version, clp->cl_minorversion); 602 seq_printf(m, ",rsize=%u", nfss->rsize); 603 seq_printf(m, ",wsize=%u", nfss->wsize); 604 if (nfss->bsize != 0) 605 seq_printf(m, ",bsize=%u", nfss->bsize); 606 seq_printf(m, ",namlen=%u", nfss->namelen); 607 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 608 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 609 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 610 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 611 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 612 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 613 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 614 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 615 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 616 if (nfss->flags & nfs_infop->flag) 617 seq_puts(m, nfs_infop->str); 618 else 619 seq_puts(m, nfs_infop->nostr); 620 } 621 rcu_read_lock(); 622 seq_printf(m, ",proto=%s", 623 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 624 rcu_read_unlock(); 625 if (version == 4) { 626 if (nfss->port != NFS_PORT) 627 seq_printf(m, ",port=%u", nfss->port); 628 } else 629 if (nfss->port) 630 seq_printf(m, ",port=%u", nfss->port); 631 632 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 633 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 634 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 635 636 if (version != 4) 637 nfs_show_mountd_options(m, nfss, showdefaults); 638 else 639 nfs_show_nfsv4_options(m, nfss, showdefaults); 640 641 if (nfss->options & NFS_OPTION_FSCACHE) 642 seq_printf(m, ",fsc"); 643 644 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 645 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 646 seq_printf(m, ",lookupcache=none"); 647 else 648 seq_printf(m, ",lookupcache=pos"); 649 } 650 651 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 652 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 653 654 if (!local_flock && !local_fcntl) 655 seq_printf(m, ",local_lock=none"); 656 else if (local_flock && local_fcntl) 657 seq_printf(m, ",local_lock=all"); 658 else if (local_flock) 659 seq_printf(m, ",local_lock=flock"); 660 else 661 seq_printf(m, ",local_lock=posix"); 662 } 663 664 /* 665 * Describe the mount options on this VFS mountpoint 666 */ 667 int nfs_show_options(struct seq_file *m, struct dentry *root) 668 { 669 struct nfs_server *nfss = NFS_SB(root->d_sb); 670 671 nfs_show_mount_options(m, nfss, 0); 672 673 rcu_read_lock(); 674 seq_printf(m, ",addr=%s", 675 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 676 RPC_DISPLAY_ADDR)); 677 rcu_read_unlock(); 678 679 return 0; 680 } 681 EXPORT_SYMBOL_GPL(nfs_show_options); 682 683 #if IS_ENABLED(CONFIG_NFS_V4) 684 #ifdef CONFIG_NFS_V4_1 685 static void show_sessions(struct seq_file *m, struct nfs_server *server) 686 { 687 if (nfs4_has_session(server->nfs_client)) 688 seq_printf(m, ",sessions"); 689 } 690 #else 691 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 692 #endif 693 #endif 694 695 #ifdef CONFIG_NFS_V4_1 696 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 697 { 698 seq_printf(m, ",pnfs="); 699 if (server->pnfs_curr_ld) 700 seq_printf(m, "%s", server->pnfs_curr_ld->name); 701 else 702 seq_printf(m, "not configured"); 703 } 704 705 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 706 { 707 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 708 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 709 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 710 "date='%llu,%u'", 711 impl_id->name, impl_id->domain, 712 impl_id->date.seconds, impl_id->date.nseconds); 713 } 714 } 715 #else 716 #if IS_ENABLED(CONFIG_NFS_V4) 717 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 718 { 719 } 720 #endif 721 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 722 { 723 } 724 #endif 725 726 int nfs_show_devname(struct seq_file *m, struct dentry *root) 727 { 728 char *page = (char *) __get_free_page(GFP_KERNEL); 729 char *devname, *dummy; 730 int err = 0; 731 if (!page) 732 return -ENOMEM; 733 devname = nfs_path(&dummy, root, page, PAGE_SIZE); 734 if (IS_ERR(devname)) 735 err = PTR_ERR(devname); 736 else 737 seq_escape(m, devname, " \t\n\\"); 738 free_page((unsigned long)page); 739 return err; 740 } 741 EXPORT_SYMBOL_GPL(nfs_show_devname); 742 743 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 744 { 745 seq_puts(m, "/"); 746 return 0; 747 } 748 EXPORT_SYMBOL_GPL(nfs_show_path); 749 750 /* 751 * Present statistical information for this VFS mountpoint 752 */ 753 int nfs_show_stats(struct seq_file *m, struct dentry *root) 754 { 755 int i, cpu; 756 struct nfs_server *nfss = NFS_SB(root->d_sb); 757 struct rpc_auth *auth = nfss->client->cl_auth; 758 struct nfs_iostats totals = { }; 759 760 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 761 762 /* 763 * Display all mount option settings 764 */ 765 seq_printf(m, "\n\topts:\t"); 766 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 767 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 768 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 769 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 770 nfs_show_mount_options(m, nfss, 1); 771 772 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 773 774 show_implementation_id(m, nfss); 775 776 seq_printf(m, "\n\tcaps:\t"); 777 seq_printf(m, "caps=0x%x", nfss->caps); 778 seq_printf(m, ",wtmult=%u", nfss->wtmult); 779 seq_printf(m, ",dtsize=%u", nfss->dtsize); 780 seq_printf(m, ",bsize=%u", nfss->bsize); 781 seq_printf(m, ",namlen=%u", nfss->namelen); 782 783 #if IS_ENABLED(CONFIG_NFS_V4) 784 if (nfss->nfs_client->rpc_ops->version == 4) { 785 seq_printf(m, "\n\tnfsv4:\t"); 786 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 787 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 788 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 789 show_sessions(m, nfss); 790 show_pnfs(m, nfss); 791 } 792 #endif 793 794 /* 795 * Display security flavor in effect for this mount 796 */ 797 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 798 if (auth->au_flavor) 799 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 800 801 /* 802 * Display superblock I/O counters 803 */ 804 for_each_possible_cpu(cpu) { 805 struct nfs_iostats *stats; 806 807 preempt_disable(); 808 stats = per_cpu_ptr(nfss->io_stats, cpu); 809 810 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 811 totals.events[i] += stats->events[i]; 812 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 813 totals.bytes[i] += stats->bytes[i]; 814 #ifdef CONFIG_NFS_FSCACHE 815 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 816 totals.fscache[i] += stats->fscache[i]; 817 #endif 818 819 preempt_enable(); 820 } 821 822 seq_printf(m, "\n\tevents:\t"); 823 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 824 seq_printf(m, "%lu ", totals.events[i]); 825 seq_printf(m, "\n\tbytes:\t"); 826 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 827 seq_printf(m, "%Lu ", totals.bytes[i]); 828 #ifdef CONFIG_NFS_FSCACHE 829 if (nfss->options & NFS_OPTION_FSCACHE) { 830 seq_printf(m, "\n\tfsc:\t"); 831 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 832 seq_printf(m, "%Lu ", totals.bytes[i]); 833 } 834 #endif 835 seq_printf(m, "\n"); 836 837 rpc_print_iostats(m, nfss->client); 838 839 return 0; 840 } 841 EXPORT_SYMBOL_GPL(nfs_show_stats); 842 843 /* 844 * Begin unmount by attempting to remove all automounted mountpoints we added 845 * in response to xdev traversals and referrals 846 */ 847 void nfs_umount_begin(struct super_block *sb) 848 { 849 struct nfs_server *server; 850 struct rpc_clnt *rpc; 851 852 server = NFS_SB(sb); 853 /* -EIO all pending I/O */ 854 rpc = server->client_acl; 855 if (!IS_ERR(rpc)) 856 rpc_killall_tasks(rpc); 857 rpc = server->client; 858 if (!IS_ERR(rpc)) 859 rpc_killall_tasks(rpc); 860 } 861 EXPORT_SYMBOL_GPL(nfs_umount_begin); 862 863 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 864 { 865 struct nfs_parsed_mount_data *data; 866 867 data = kzalloc(sizeof(*data), GFP_KERNEL); 868 if (data) { 869 data->acregmin = NFS_DEF_ACREGMIN; 870 data->acregmax = NFS_DEF_ACREGMAX; 871 data->acdirmin = NFS_DEF_ACDIRMIN; 872 data->acdirmax = NFS_DEF_ACDIRMAX; 873 data->mount_server.port = NFS_UNSPEC_PORT; 874 data->nfs_server.port = NFS_UNSPEC_PORT; 875 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 876 data->auth_flavors[0] = RPC_AUTH_UNIX; 877 data->auth_flavor_len = 1; 878 data->minorversion = 0; 879 data->need_mount = true; 880 data->net = current->nsproxy->net_ns; 881 security_init_mnt_opts(&data->lsm_opts); 882 } 883 return data; 884 } 885 886 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 887 { 888 if (data) { 889 kfree(data->client_address); 890 kfree(data->mount_server.hostname); 891 kfree(data->nfs_server.export_path); 892 kfree(data->nfs_server.hostname); 893 kfree(data->fscache_uniq); 894 security_free_mnt_opts(&data->lsm_opts); 895 kfree(data); 896 } 897 } 898 899 /* 900 * Sanity-check a server address provided by the mount command. 901 * 902 * Address family must be initialized, and address must not be 903 * the ANY address for that family. 904 */ 905 static int nfs_verify_server_address(struct sockaddr *addr) 906 { 907 switch (addr->sa_family) { 908 case AF_INET: { 909 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 910 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 911 } 912 case AF_INET6: { 913 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 914 return !ipv6_addr_any(sa); 915 } 916 } 917 918 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 919 return 0; 920 } 921 922 /* 923 * Select between a default port value and a user-specified port value. 924 * If a zero value is set, then autobind will be used. 925 */ 926 static void nfs_set_port(struct sockaddr *sap, int *port, 927 const unsigned short default_port) 928 { 929 if (*port == NFS_UNSPEC_PORT) 930 *port = default_port; 931 932 rpc_set_port(sap, *port); 933 } 934 935 /* 936 * Sanity check the NFS transport protocol. 937 * 938 */ 939 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 940 { 941 switch (mnt->nfs_server.protocol) { 942 case XPRT_TRANSPORT_UDP: 943 case XPRT_TRANSPORT_TCP: 944 case XPRT_TRANSPORT_RDMA: 945 break; 946 default: 947 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 948 } 949 } 950 951 /* 952 * For text based NFSv2/v3 mounts, the mount protocol transport default 953 * settings should depend upon the specified NFS transport. 954 */ 955 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 956 { 957 nfs_validate_transport_protocol(mnt); 958 959 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 960 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 961 return; 962 switch (mnt->nfs_server.protocol) { 963 case XPRT_TRANSPORT_UDP: 964 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 965 break; 966 case XPRT_TRANSPORT_TCP: 967 case XPRT_TRANSPORT_RDMA: 968 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 969 } 970 } 971 972 /* 973 * Parse the value of the 'sec=' option. 974 */ 975 static int nfs_parse_security_flavors(char *value, 976 struct nfs_parsed_mount_data *mnt) 977 { 978 substring_t args[MAX_OPT_ARGS]; 979 980 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 981 982 switch (match_token(value, nfs_secflavor_tokens, args)) { 983 case Opt_sec_none: 984 mnt->auth_flavors[0] = RPC_AUTH_NULL; 985 break; 986 case Opt_sec_sys: 987 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 988 break; 989 case Opt_sec_krb5: 990 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 991 break; 992 case Opt_sec_krb5i: 993 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 994 break; 995 case Opt_sec_krb5p: 996 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 997 break; 998 case Opt_sec_lkey: 999 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1000 break; 1001 case Opt_sec_lkeyi: 1002 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1003 break; 1004 case Opt_sec_lkeyp: 1005 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1006 break; 1007 case Opt_sec_spkm: 1008 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1009 break; 1010 case Opt_sec_spkmi: 1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1012 break; 1013 case Opt_sec_spkmp: 1014 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1015 break; 1016 default: 1017 return 0; 1018 } 1019 1020 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1021 mnt->auth_flavor_len = 1; 1022 return 1; 1023 } 1024 1025 static int nfs_parse_version_string(char *string, 1026 struct nfs_parsed_mount_data *mnt, 1027 substring_t *args) 1028 { 1029 mnt->flags &= ~NFS_MOUNT_VER3; 1030 switch (match_token(string, nfs_vers_tokens, args)) { 1031 case Opt_vers_2: 1032 mnt->version = 2; 1033 break; 1034 case Opt_vers_3: 1035 mnt->flags |= NFS_MOUNT_VER3; 1036 mnt->version = 3; 1037 break; 1038 case Opt_vers_4: 1039 /* Backward compatibility option. In future, 1040 * the mount program should always supply 1041 * a NFSv4 minor version number. 1042 */ 1043 mnt->version = 4; 1044 break; 1045 case Opt_vers_4_0: 1046 mnt->version = 4; 1047 mnt->minorversion = 0; 1048 break; 1049 case Opt_vers_4_1: 1050 mnt->version = 4; 1051 mnt->minorversion = 1; 1052 break; 1053 default: 1054 return 0; 1055 } 1056 return 1; 1057 } 1058 1059 static int nfs_get_option_str(substring_t args[], char **option) 1060 { 1061 kfree(*option); 1062 *option = match_strdup(args); 1063 return !option; 1064 } 1065 1066 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1067 { 1068 int rc; 1069 char *string; 1070 1071 string = match_strdup(args); 1072 if (string == NULL) 1073 return -ENOMEM; 1074 rc = strict_strtoul(string, 10, option); 1075 kfree(string); 1076 1077 return rc; 1078 } 1079 1080 /* 1081 * Error-check and convert a string of mount options from user space into 1082 * a data structure. The whole mount string is processed; bad options are 1083 * skipped as they are encountered. If there were no errors, return 1; 1084 * otherwise return 0 (zero). 1085 */ 1086 static int nfs_parse_mount_options(char *raw, 1087 struct nfs_parsed_mount_data *mnt) 1088 { 1089 char *p, *string, *secdata; 1090 int rc, sloppy = 0, invalid_option = 0; 1091 unsigned short protofamily = AF_UNSPEC; 1092 unsigned short mountfamily = AF_UNSPEC; 1093 1094 if (!raw) { 1095 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1096 return 1; 1097 } 1098 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1099 1100 secdata = alloc_secdata(); 1101 if (!secdata) 1102 goto out_nomem; 1103 1104 rc = security_sb_copy_data(raw, secdata); 1105 if (rc) 1106 goto out_security_failure; 1107 1108 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1109 if (rc) 1110 goto out_security_failure; 1111 1112 free_secdata(secdata); 1113 1114 while ((p = strsep(&raw, ",")) != NULL) { 1115 substring_t args[MAX_OPT_ARGS]; 1116 unsigned long option; 1117 int token; 1118 1119 if (!*p) 1120 continue; 1121 1122 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1123 1124 token = match_token(p, nfs_mount_option_tokens, args); 1125 switch (token) { 1126 1127 /* 1128 * boolean options: foo/nofoo 1129 */ 1130 case Opt_soft: 1131 mnt->flags |= NFS_MOUNT_SOFT; 1132 break; 1133 case Opt_hard: 1134 mnt->flags &= ~NFS_MOUNT_SOFT; 1135 break; 1136 case Opt_posix: 1137 mnt->flags |= NFS_MOUNT_POSIX; 1138 break; 1139 case Opt_noposix: 1140 mnt->flags &= ~NFS_MOUNT_POSIX; 1141 break; 1142 case Opt_cto: 1143 mnt->flags &= ~NFS_MOUNT_NOCTO; 1144 break; 1145 case Opt_nocto: 1146 mnt->flags |= NFS_MOUNT_NOCTO; 1147 break; 1148 case Opt_ac: 1149 mnt->flags &= ~NFS_MOUNT_NOAC; 1150 break; 1151 case Opt_noac: 1152 mnt->flags |= NFS_MOUNT_NOAC; 1153 break; 1154 case Opt_lock: 1155 mnt->flags &= ~NFS_MOUNT_NONLM; 1156 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1157 NFS_MOUNT_LOCAL_FCNTL); 1158 break; 1159 case Opt_nolock: 1160 mnt->flags |= NFS_MOUNT_NONLM; 1161 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1162 NFS_MOUNT_LOCAL_FCNTL); 1163 break; 1164 case Opt_udp: 1165 mnt->flags &= ~NFS_MOUNT_TCP; 1166 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1167 break; 1168 case Opt_tcp: 1169 mnt->flags |= NFS_MOUNT_TCP; 1170 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1171 break; 1172 case Opt_rdma: 1173 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1174 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1175 xprt_load_transport(p); 1176 break; 1177 case Opt_acl: 1178 mnt->flags &= ~NFS_MOUNT_NOACL; 1179 break; 1180 case Opt_noacl: 1181 mnt->flags |= NFS_MOUNT_NOACL; 1182 break; 1183 case Opt_rdirplus: 1184 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1185 break; 1186 case Opt_nordirplus: 1187 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1188 break; 1189 case Opt_sharecache: 1190 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1191 break; 1192 case Opt_nosharecache: 1193 mnt->flags |= NFS_MOUNT_UNSHARED; 1194 break; 1195 case Opt_resvport: 1196 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1197 break; 1198 case Opt_noresvport: 1199 mnt->flags |= NFS_MOUNT_NORESVPORT; 1200 break; 1201 case Opt_fscache: 1202 mnt->options |= NFS_OPTION_FSCACHE; 1203 kfree(mnt->fscache_uniq); 1204 mnt->fscache_uniq = NULL; 1205 break; 1206 case Opt_nofscache: 1207 mnt->options &= ~NFS_OPTION_FSCACHE; 1208 kfree(mnt->fscache_uniq); 1209 mnt->fscache_uniq = NULL; 1210 break; 1211 1212 /* 1213 * options that take numeric values 1214 */ 1215 case Opt_port: 1216 if (nfs_get_option_ul(args, &option) || 1217 option > USHRT_MAX) 1218 goto out_invalid_value; 1219 mnt->nfs_server.port = option; 1220 break; 1221 case Opt_rsize: 1222 if (nfs_get_option_ul(args, &option)) 1223 goto out_invalid_value; 1224 mnt->rsize = option; 1225 break; 1226 case Opt_wsize: 1227 if (nfs_get_option_ul(args, &option)) 1228 goto out_invalid_value; 1229 mnt->wsize = option; 1230 break; 1231 case Opt_bsize: 1232 if (nfs_get_option_ul(args, &option)) 1233 goto out_invalid_value; 1234 mnt->bsize = option; 1235 break; 1236 case Opt_timeo: 1237 if (nfs_get_option_ul(args, &option) || option == 0) 1238 goto out_invalid_value; 1239 mnt->timeo = option; 1240 break; 1241 case Opt_retrans: 1242 if (nfs_get_option_ul(args, &option) || option == 0) 1243 goto out_invalid_value; 1244 mnt->retrans = option; 1245 break; 1246 case Opt_acregmin: 1247 if (nfs_get_option_ul(args, &option)) 1248 goto out_invalid_value; 1249 mnt->acregmin = option; 1250 break; 1251 case Opt_acregmax: 1252 if (nfs_get_option_ul(args, &option)) 1253 goto out_invalid_value; 1254 mnt->acregmax = option; 1255 break; 1256 case Opt_acdirmin: 1257 if (nfs_get_option_ul(args, &option)) 1258 goto out_invalid_value; 1259 mnt->acdirmin = option; 1260 break; 1261 case Opt_acdirmax: 1262 if (nfs_get_option_ul(args, &option)) 1263 goto out_invalid_value; 1264 mnt->acdirmax = option; 1265 break; 1266 case Opt_actimeo: 1267 if (nfs_get_option_ul(args, &option)) 1268 goto out_invalid_value; 1269 mnt->acregmin = mnt->acregmax = 1270 mnt->acdirmin = mnt->acdirmax = option; 1271 break; 1272 case Opt_namelen: 1273 if (nfs_get_option_ul(args, &option)) 1274 goto out_invalid_value; 1275 mnt->namlen = option; 1276 break; 1277 case Opt_mountport: 1278 if (nfs_get_option_ul(args, &option) || 1279 option > USHRT_MAX) 1280 goto out_invalid_value; 1281 mnt->mount_server.port = option; 1282 break; 1283 case Opt_mountvers: 1284 if (nfs_get_option_ul(args, &option) || 1285 option < NFS_MNT_VERSION || 1286 option > NFS_MNT3_VERSION) 1287 goto out_invalid_value; 1288 mnt->mount_server.version = option; 1289 break; 1290 case Opt_minorversion: 1291 if (nfs_get_option_ul(args, &option)) 1292 goto out_invalid_value; 1293 if (option > NFS4_MAX_MINOR_VERSION) 1294 goto out_invalid_value; 1295 mnt->minorversion = option; 1296 break; 1297 1298 /* 1299 * options that take text values 1300 */ 1301 case Opt_nfsvers: 1302 string = match_strdup(args); 1303 if (string == NULL) 1304 goto out_nomem; 1305 rc = nfs_parse_version_string(string, mnt, args); 1306 kfree(string); 1307 if (!rc) 1308 goto out_invalid_value; 1309 break; 1310 case Opt_sec: 1311 string = match_strdup(args); 1312 if (string == NULL) 1313 goto out_nomem; 1314 rc = nfs_parse_security_flavors(string, mnt); 1315 kfree(string); 1316 if (!rc) { 1317 dfprintk(MOUNT, "NFS: unrecognized " 1318 "security flavor\n"); 1319 return 0; 1320 } 1321 break; 1322 case Opt_proto: 1323 string = match_strdup(args); 1324 if (string == NULL) 1325 goto out_nomem; 1326 token = match_token(string, 1327 nfs_xprt_protocol_tokens, args); 1328 1329 protofamily = AF_INET; 1330 switch (token) { 1331 case Opt_xprt_udp6: 1332 protofamily = AF_INET6; 1333 case Opt_xprt_udp: 1334 mnt->flags &= ~NFS_MOUNT_TCP; 1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1336 break; 1337 case Opt_xprt_tcp6: 1338 protofamily = AF_INET6; 1339 case Opt_xprt_tcp: 1340 mnt->flags |= NFS_MOUNT_TCP; 1341 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1342 break; 1343 case Opt_xprt_rdma: 1344 /* vector side protocols to TCP */ 1345 mnt->flags |= NFS_MOUNT_TCP; 1346 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1347 xprt_load_transport(string); 1348 break; 1349 default: 1350 dfprintk(MOUNT, "NFS: unrecognized " 1351 "transport protocol\n"); 1352 kfree(string); 1353 return 0; 1354 } 1355 kfree(string); 1356 break; 1357 case Opt_mountproto: 1358 string = match_strdup(args); 1359 if (string == NULL) 1360 goto out_nomem; 1361 token = match_token(string, 1362 nfs_xprt_protocol_tokens, args); 1363 kfree(string); 1364 1365 mountfamily = AF_INET; 1366 switch (token) { 1367 case Opt_xprt_udp6: 1368 mountfamily = AF_INET6; 1369 case Opt_xprt_udp: 1370 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1371 break; 1372 case Opt_xprt_tcp6: 1373 mountfamily = AF_INET6; 1374 case Opt_xprt_tcp: 1375 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1376 break; 1377 case Opt_xprt_rdma: /* not used for side protocols */ 1378 default: 1379 dfprintk(MOUNT, "NFS: unrecognized " 1380 "transport protocol\n"); 1381 return 0; 1382 } 1383 break; 1384 case Opt_addr: 1385 string = match_strdup(args); 1386 if (string == NULL) 1387 goto out_nomem; 1388 mnt->nfs_server.addrlen = 1389 rpc_pton(mnt->net, string, strlen(string), 1390 (struct sockaddr *) 1391 &mnt->nfs_server.address, 1392 sizeof(mnt->nfs_server.address)); 1393 kfree(string); 1394 if (mnt->nfs_server.addrlen == 0) 1395 goto out_invalid_address; 1396 break; 1397 case Opt_clientaddr: 1398 if (nfs_get_option_str(args, &mnt->client_address)) 1399 goto out_nomem; 1400 break; 1401 case Opt_mounthost: 1402 if (nfs_get_option_str(args, 1403 &mnt->mount_server.hostname)) 1404 goto out_nomem; 1405 break; 1406 case Opt_mountaddr: 1407 string = match_strdup(args); 1408 if (string == NULL) 1409 goto out_nomem; 1410 mnt->mount_server.addrlen = 1411 rpc_pton(mnt->net, string, strlen(string), 1412 (struct sockaddr *) 1413 &mnt->mount_server.address, 1414 sizeof(mnt->mount_server.address)); 1415 kfree(string); 1416 if (mnt->mount_server.addrlen == 0) 1417 goto out_invalid_address; 1418 break; 1419 case Opt_lookupcache: 1420 string = match_strdup(args); 1421 if (string == NULL) 1422 goto out_nomem; 1423 token = match_token(string, 1424 nfs_lookupcache_tokens, args); 1425 kfree(string); 1426 switch (token) { 1427 case Opt_lookupcache_all: 1428 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1429 break; 1430 case Opt_lookupcache_positive: 1431 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1432 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1433 break; 1434 case Opt_lookupcache_none: 1435 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1436 break; 1437 default: 1438 dfprintk(MOUNT, "NFS: invalid " 1439 "lookupcache argument\n"); 1440 return 0; 1441 }; 1442 break; 1443 case Opt_fscache_uniq: 1444 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1445 goto out_nomem; 1446 mnt->options |= NFS_OPTION_FSCACHE; 1447 break; 1448 case Opt_local_lock: 1449 string = match_strdup(args); 1450 if (string == NULL) 1451 goto out_nomem; 1452 token = match_token(string, nfs_local_lock_tokens, 1453 args); 1454 kfree(string); 1455 switch (token) { 1456 case Opt_local_lock_all: 1457 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1458 NFS_MOUNT_LOCAL_FCNTL); 1459 break; 1460 case Opt_local_lock_flock: 1461 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1462 break; 1463 case Opt_local_lock_posix: 1464 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1465 break; 1466 case Opt_local_lock_none: 1467 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1468 NFS_MOUNT_LOCAL_FCNTL); 1469 break; 1470 default: 1471 dfprintk(MOUNT, "NFS: invalid " 1472 "local_lock argument\n"); 1473 return 0; 1474 }; 1475 break; 1476 1477 /* 1478 * Special options 1479 */ 1480 case Opt_sloppy: 1481 sloppy = 1; 1482 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1483 break; 1484 case Opt_userspace: 1485 case Opt_deprecated: 1486 dfprintk(MOUNT, "NFS: ignoring mount option " 1487 "'%s'\n", p); 1488 break; 1489 1490 default: 1491 invalid_option = 1; 1492 dfprintk(MOUNT, "NFS: unrecognized mount option " 1493 "'%s'\n", p); 1494 } 1495 } 1496 1497 if (!sloppy && invalid_option) 1498 return 0; 1499 1500 if (mnt->minorversion && mnt->version != 4) 1501 goto out_minorversion_mismatch; 1502 1503 /* 1504 * verify that any proto=/mountproto= options match the address 1505 * familiies in the addr=/mountaddr= options. 1506 */ 1507 if (protofamily != AF_UNSPEC && 1508 protofamily != mnt->nfs_server.address.ss_family) 1509 goto out_proto_mismatch; 1510 1511 if (mountfamily != AF_UNSPEC) { 1512 if (mnt->mount_server.addrlen) { 1513 if (mountfamily != mnt->mount_server.address.ss_family) 1514 goto out_mountproto_mismatch; 1515 } else { 1516 if (mountfamily != mnt->nfs_server.address.ss_family) 1517 goto out_mountproto_mismatch; 1518 } 1519 } 1520 1521 return 1; 1522 1523 out_mountproto_mismatch: 1524 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1525 "option\n"); 1526 return 0; 1527 out_proto_mismatch: 1528 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1529 return 0; 1530 out_invalid_address: 1531 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1532 return 0; 1533 out_invalid_value: 1534 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1535 return 0; 1536 out_minorversion_mismatch: 1537 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1538 "minorversion=%u\n", mnt->version, mnt->minorversion); 1539 return 0; 1540 out_nomem: 1541 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1542 return 0; 1543 out_security_failure: 1544 free_secdata(secdata); 1545 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1546 return 0; 1547 } 1548 1549 /* 1550 * Match the requested auth flavors with the list returned by 1551 * the server. Returns zero and sets the mount's authentication 1552 * flavor on success; returns -EACCES if server does not support 1553 * the requested flavor. 1554 */ 1555 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1556 struct nfs_mount_request *request) 1557 { 1558 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1559 1560 /* 1561 * Certain releases of Linux's mountd return an empty 1562 * flavor list. To prevent behavioral regression with 1563 * these servers (ie. rejecting mounts that used to 1564 * succeed), revert to pre-2.6.32 behavior (no checking) 1565 * if the returned flavor list is empty. 1566 */ 1567 if (server_authlist_len == 0) 1568 return 0; 1569 1570 /* 1571 * We avoid sophisticated negotiating here, as there are 1572 * plenty of cases where we can get it wrong, providing 1573 * either too little or too much security. 1574 * 1575 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1576 * flavor listed first. However, some servers list 1577 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1578 * preferred default, in args->auth_flavors[0] if user 1579 * didn't specify sec= mount option. 1580 */ 1581 for (i = 0; i < args->auth_flavor_len; i++) 1582 for (j = 0; j < server_authlist_len; j++) 1583 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1584 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1585 request->auth_flavs[j]); 1586 args->auth_flavors[0] = request->auth_flavs[j]; 1587 return 0; 1588 } 1589 1590 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1591 nfs_umount(request); 1592 return -EACCES; 1593 } 1594 1595 /* 1596 * Use the remote server's MOUNT service to request the NFS file handle 1597 * corresponding to the provided path. 1598 */ 1599 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1600 struct nfs_fh *root_fh) 1601 { 1602 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1603 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1604 struct nfs_mount_request request = { 1605 .sap = (struct sockaddr *) 1606 &args->mount_server.address, 1607 .dirpath = args->nfs_server.export_path, 1608 .protocol = args->mount_server.protocol, 1609 .fh = root_fh, 1610 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1611 .auth_flav_len = &server_authlist_len, 1612 .auth_flavs = server_authlist, 1613 .net = args->net, 1614 }; 1615 int status; 1616 1617 if (args->mount_server.version == 0) { 1618 switch (args->version) { 1619 default: 1620 args->mount_server.version = NFS_MNT3_VERSION; 1621 break; 1622 case 2: 1623 args->mount_server.version = NFS_MNT_VERSION; 1624 } 1625 } 1626 request.version = args->mount_server.version; 1627 1628 if (args->mount_server.hostname) 1629 request.hostname = args->mount_server.hostname; 1630 else 1631 request.hostname = args->nfs_server.hostname; 1632 1633 /* 1634 * Construct the mount server's address. 1635 */ 1636 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1637 memcpy(request.sap, &args->nfs_server.address, 1638 args->nfs_server.addrlen); 1639 args->mount_server.addrlen = args->nfs_server.addrlen; 1640 } 1641 request.salen = args->mount_server.addrlen; 1642 nfs_set_port(request.sap, &args->mount_server.port, 0); 1643 1644 /* 1645 * Now ask the mount server to map our export path 1646 * to a file handle. 1647 */ 1648 status = nfs_mount(&request); 1649 if (status != 0) { 1650 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1651 request.hostname, status); 1652 return status; 1653 } 1654 1655 /* 1656 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1657 */ 1658 if (args->mount_server.version != NFS_MNT3_VERSION) 1659 return 0; 1660 return nfs_walk_authlist(args, &request); 1661 } 1662 1663 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1664 struct nfs_mount_info *mount_info, 1665 struct nfs_subversion *nfs_mod) 1666 { 1667 int status; 1668 struct nfs_server *server; 1669 1670 if (mount_info->parsed->need_mount) { 1671 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1672 if (status) 1673 return ERR_PTR(status); 1674 } 1675 1676 /* Get a volume representation */ 1677 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1678 if (IS_ERR(server)) 1679 return ERR_CAST(server); 1680 1681 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1682 } 1683 EXPORT_SYMBOL_GPL(nfs_try_mount); 1684 1685 /* 1686 * Split "dev_name" into "hostname:export_path". 1687 * 1688 * The leftmost colon demarks the split between the server's hostname 1689 * and the export path. If the hostname starts with a left square 1690 * bracket, then it may contain colons. 1691 * 1692 * Note: caller frees hostname and export path, even on error. 1693 */ 1694 static int nfs_parse_devname(const char *dev_name, 1695 char **hostname, size_t maxnamlen, 1696 char **export_path, size_t maxpathlen) 1697 { 1698 size_t len; 1699 char *end; 1700 1701 /* Is the host name protected with square brakcets? */ 1702 if (*dev_name == '[') { 1703 end = strchr(++dev_name, ']'); 1704 if (end == NULL || end[1] != ':') 1705 goto out_bad_devname; 1706 1707 len = end - dev_name; 1708 end++; 1709 } else { 1710 char *comma; 1711 1712 end = strchr(dev_name, ':'); 1713 if (end == NULL) 1714 goto out_bad_devname; 1715 len = end - dev_name; 1716 1717 /* kill possible hostname list: not supported */ 1718 comma = strchr(dev_name, ','); 1719 if (comma != NULL && comma < end) 1720 *comma = 0; 1721 } 1722 1723 if (len > maxnamlen) 1724 goto out_hostname; 1725 1726 /* N.B. caller will free nfs_server.hostname in all cases */ 1727 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1728 if (*hostname == NULL) 1729 goto out_nomem; 1730 len = strlen(++end); 1731 if (len > maxpathlen) 1732 goto out_path; 1733 *export_path = kstrndup(end, len, GFP_KERNEL); 1734 if (!*export_path) 1735 goto out_nomem; 1736 1737 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1738 return 0; 1739 1740 out_bad_devname: 1741 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1742 return -EINVAL; 1743 1744 out_nomem: 1745 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1746 return -ENOMEM; 1747 1748 out_hostname: 1749 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1750 return -ENAMETOOLONG; 1751 1752 out_path: 1753 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1754 return -ENAMETOOLONG; 1755 } 1756 1757 /* 1758 * Validate the NFS2/NFS3 mount data 1759 * - fills in the mount root filehandle 1760 * 1761 * For option strings, user space handles the following behaviors: 1762 * 1763 * + DNS: mapping server host name to IP address ("addr=" option) 1764 * 1765 * + failure mode: how to behave if a mount request can't be handled 1766 * immediately ("fg/bg" option) 1767 * 1768 * + retry: how often to retry a mount request ("retry=" option) 1769 * 1770 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1771 * mountproto=tcp after mountproto=udp, and so on 1772 */ 1773 static int nfs23_validate_mount_data(void *options, 1774 struct nfs_parsed_mount_data *args, 1775 struct nfs_fh *mntfh, 1776 const char *dev_name) 1777 { 1778 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1779 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1780 1781 if (data == NULL) 1782 goto out_no_data; 1783 1784 args->version = NFS_DEFAULT_VERSION; 1785 switch (data->version) { 1786 case 1: 1787 data->namlen = 0; 1788 case 2: 1789 data->bsize = 0; 1790 case 3: 1791 if (data->flags & NFS_MOUNT_VER3) 1792 goto out_no_v3; 1793 data->root.size = NFS2_FHSIZE; 1794 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1795 case 4: 1796 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1797 goto out_no_sec; 1798 case 5: 1799 memset(data->context, 0, sizeof(data->context)); 1800 case 6: 1801 if (data->flags & NFS_MOUNT_VER3) { 1802 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1803 goto out_invalid_fh; 1804 mntfh->size = data->root.size; 1805 args->version = 3; 1806 } else { 1807 mntfh->size = NFS2_FHSIZE; 1808 args->version = 2; 1809 } 1810 1811 1812 memcpy(mntfh->data, data->root.data, mntfh->size); 1813 if (mntfh->size < sizeof(mntfh->data)) 1814 memset(mntfh->data + mntfh->size, 0, 1815 sizeof(mntfh->data) - mntfh->size); 1816 1817 /* 1818 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1819 * can deal with. 1820 */ 1821 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1822 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1823 args->rsize = data->rsize; 1824 args->wsize = data->wsize; 1825 args->timeo = data->timeo; 1826 args->retrans = data->retrans; 1827 args->acregmin = data->acregmin; 1828 args->acregmax = data->acregmax; 1829 args->acdirmin = data->acdirmin; 1830 args->acdirmax = data->acdirmax; 1831 args->need_mount = false; 1832 1833 memcpy(sap, &data->addr, sizeof(data->addr)); 1834 args->nfs_server.addrlen = sizeof(data->addr); 1835 if (!nfs_verify_server_address(sap)) 1836 goto out_no_address; 1837 1838 if (!(data->flags & NFS_MOUNT_TCP)) 1839 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1840 /* N.B. caller will free nfs_server.hostname in all cases */ 1841 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1842 args->namlen = data->namlen; 1843 args->bsize = data->bsize; 1844 1845 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1846 args->auth_flavors[0] = data->pseudoflavor; 1847 if (!args->nfs_server.hostname) 1848 goto out_nomem; 1849 1850 if (!(data->flags & NFS_MOUNT_NONLM)) 1851 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1852 NFS_MOUNT_LOCAL_FCNTL); 1853 else 1854 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1855 NFS_MOUNT_LOCAL_FCNTL); 1856 /* 1857 * The legacy version 6 binary mount data from userspace has a 1858 * field used only to transport selinux information into the 1859 * the kernel. To continue to support that functionality we 1860 * have a touch of selinux knowledge here in the NFS code. The 1861 * userspace code converted context=blah to just blah so we are 1862 * converting back to the full string selinux understands. 1863 */ 1864 if (data->context[0]){ 1865 #ifdef CONFIG_SECURITY_SELINUX 1866 int rc; 1867 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1868 if (!opts_str) 1869 return -ENOMEM; 1870 strcpy(opts_str, "context="); 1871 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1872 strcat(opts_str, &data->context[0]); 1873 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1874 kfree(opts_str); 1875 if (rc) 1876 return rc; 1877 #else 1878 return -EINVAL; 1879 #endif 1880 } 1881 1882 break; 1883 default: 1884 return NFS_TEXT_DATA; 1885 } 1886 1887 #if !IS_ENABLED(CONFIG_NFS_V3) 1888 if (args->version == 3) 1889 goto out_v3_not_compiled; 1890 #endif /* !CONFIG_NFS_V3 */ 1891 1892 return 0; 1893 1894 out_no_data: 1895 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1896 return -EINVAL; 1897 1898 out_no_v3: 1899 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1900 data->version); 1901 return -EINVAL; 1902 1903 out_no_sec: 1904 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1905 return -EINVAL; 1906 1907 #if !IS_ENABLED(CONFIG_NFS_V3) 1908 out_v3_not_compiled: 1909 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1910 return -EPROTONOSUPPORT; 1911 #endif /* !CONFIG_NFS_V3 */ 1912 1913 out_nomem: 1914 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1915 return -ENOMEM; 1916 1917 out_no_address: 1918 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1919 return -EINVAL; 1920 1921 out_invalid_fh: 1922 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1923 return -EINVAL; 1924 } 1925 1926 #if IS_ENABLED(CONFIG_NFS_V4) 1927 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1928 void *options, 1929 struct nfs_parsed_mount_data *args, 1930 struct nfs_fh *mntfh, 1931 const char *dev_name) 1932 { 1933 if (fs_type == &nfs_fs_type) 1934 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 1935 return nfs4_validate_mount_data(options, args, dev_name); 1936 } 1937 #else 1938 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1939 void *options, 1940 struct nfs_parsed_mount_data *args, 1941 struct nfs_fh *mntfh, 1942 const char *dev_name) 1943 { 1944 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 1945 } 1946 #endif 1947 1948 static int nfs_validate_text_mount_data(void *options, 1949 struct nfs_parsed_mount_data *args, 1950 const char *dev_name) 1951 { 1952 int port = 0; 1953 int max_namelen = PAGE_SIZE; 1954 int max_pathlen = NFS_MAXPATHLEN; 1955 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1956 1957 if (nfs_parse_mount_options((char *)options, args) == 0) 1958 return -EINVAL; 1959 1960 if (!nfs_verify_server_address(sap)) 1961 goto out_no_address; 1962 1963 if (args->version == 4) { 1964 #if IS_ENABLED(CONFIG_NFS_V4) 1965 port = NFS_PORT; 1966 max_namelen = NFS4_MAXNAMLEN; 1967 max_pathlen = NFS4_MAXPATHLEN; 1968 nfs_validate_transport_protocol(args); 1969 nfs4_validate_mount_flags(args); 1970 #else 1971 goto out_v4_not_compiled; 1972 #endif /* CONFIG_NFS_V4 */ 1973 } else 1974 nfs_set_mount_transport_protocol(args); 1975 1976 nfs_set_port(sap, &args->nfs_server.port, port); 1977 1978 if (args->auth_flavor_len > 1) 1979 goto out_bad_auth; 1980 1981 return nfs_parse_devname(dev_name, 1982 &args->nfs_server.hostname, 1983 max_namelen, 1984 &args->nfs_server.export_path, 1985 max_pathlen); 1986 1987 #if !IS_ENABLED(CONFIG_NFS_V4) 1988 out_v4_not_compiled: 1989 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1990 return -EPROTONOSUPPORT; 1991 #endif /* !CONFIG_NFS_V4 */ 1992 1993 out_no_address: 1994 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1995 return -EINVAL; 1996 1997 out_bad_auth: 1998 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 1999 return -EINVAL; 2000 } 2001 2002 static int 2003 nfs_compare_remount_data(struct nfs_server *nfss, 2004 struct nfs_parsed_mount_data *data) 2005 { 2006 if (data->flags != nfss->flags || 2007 data->rsize != nfss->rsize || 2008 data->wsize != nfss->wsize || 2009 data->retrans != nfss->client->cl_timeout->to_retries || 2010 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2011 data->acregmin != nfss->acregmin / HZ || 2012 data->acregmax != nfss->acregmax / HZ || 2013 data->acdirmin != nfss->acdirmin / HZ || 2014 data->acdirmax != nfss->acdirmax / HZ || 2015 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2016 data->nfs_server.port != nfss->port || 2017 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2018 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2019 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2020 return -EINVAL; 2021 2022 return 0; 2023 } 2024 2025 int 2026 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2027 { 2028 int error; 2029 struct nfs_server *nfss = sb->s_fs_info; 2030 struct nfs_parsed_mount_data *data; 2031 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2032 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2033 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2034 2035 /* 2036 * Userspace mount programs that send binary options generally send 2037 * them populated with default values. We have no way to know which 2038 * ones were explicitly specified. Fall back to legacy behavior and 2039 * just return success. 2040 */ 2041 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2042 (nfsvers <= 3 && (!options || (options->version >= 1 && 2043 options->version <= 6)))) 2044 return 0; 2045 2046 data = kzalloc(sizeof(*data), GFP_KERNEL); 2047 if (data == NULL) 2048 return -ENOMEM; 2049 2050 /* fill out struct with values from existing mount */ 2051 data->flags = nfss->flags; 2052 data->rsize = nfss->rsize; 2053 data->wsize = nfss->wsize; 2054 data->retrans = nfss->client->cl_timeout->to_retries; 2055 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2056 data->acregmin = nfss->acregmin / HZ; 2057 data->acregmax = nfss->acregmax / HZ; 2058 data->acdirmin = nfss->acdirmin / HZ; 2059 data->acdirmax = nfss->acdirmax / HZ; 2060 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2061 data->nfs_server.port = nfss->port; 2062 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2063 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2064 data->nfs_server.addrlen); 2065 2066 /* overwrite those values with any that were specified */ 2067 error = nfs_parse_mount_options((char *)options, data); 2068 if (error < 0) 2069 goto out; 2070 2071 /* 2072 * noac is a special case. It implies -o sync, but that's not 2073 * necessarily reflected in the mtab options. do_remount_sb 2074 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2075 * remount options, so we have to explicitly reset it. 2076 */ 2077 if (data->flags & NFS_MOUNT_NOAC) 2078 *flags |= MS_SYNCHRONOUS; 2079 2080 /* compare new mount options with old ones */ 2081 error = nfs_compare_remount_data(nfss, data); 2082 out: 2083 kfree(data); 2084 return error; 2085 } 2086 EXPORT_SYMBOL_GPL(nfs_remount); 2087 2088 /* 2089 * Initialise the common bits of the superblock 2090 */ 2091 inline void nfs_initialise_sb(struct super_block *sb) 2092 { 2093 struct nfs_server *server = NFS_SB(sb); 2094 2095 sb->s_magic = NFS_SUPER_MAGIC; 2096 2097 /* We probably want something more informative here */ 2098 snprintf(sb->s_id, sizeof(sb->s_id), 2099 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2100 2101 if (sb->s_blocksize == 0) 2102 sb->s_blocksize = nfs_block_bits(server->wsize, 2103 &sb->s_blocksize_bits); 2104 2105 sb->s_bdi = &server->backing_dev_info; 2106 2107 nfs_super_set_maxbytes(sb, server->maxfilesize); 2108 } 2109 2110 /* 2111 * Finish setting up an NFS2/3 superblock 2112 */ 2113 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2114 { 2115 struct nfs_parsed_mount_data *data = mount_info->parsed; 2116 struct nfs_server *server = NFS_SB(sb); 2117 2118 sb->s_blocksize_bits = 0; 2119 sb->s_blocksize = 0; 2120 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2121 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2122 if (data && data->bsize) 2123 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2124 2125 if (server->nfs_client->rpc_ops->version != 2) { 2126 /* The VFS shouldn't apply the umask to mode bits. We will do 2127 * so ourselves when necessary. 2128 */ 2129 sb->s_flags |= MS_POSIXACL; 2130 sb->s_time_gran = 1; 2131 } 2132 2133 nfs_initialise_sb(sb); 2134 } 2135 EXPORT_SYMBOL_GPL(nfs_fill_super); 2136 2137 /* 2138 * Finish setting up a cloned NFS2/3/4 superblock 2139 */ 2140 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2141 { 2142 const struct super_block *old_sb = mount_info->cloned->sb; 2143 struct nfs_server *server = NFS_SB(sb); 2144 2145 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2146 sb->s_blocksize = old_sb->s_blocksize; 2147 sb->s_maxbytes = old_sb->s_maxbytes; 2148 sb->s_xattr = old_sb->s_xattr; 2149 sb->s_op = old_sb->s_op; 2150 sb->s_time_gran = 1; 2151 2152 if (server->nfs_client->rpc_ops->version != 2) { 2153 /* The VFS shouldn't apply the umask to mode bits. We will do 2154 * so ourselves when necessary. 2155 */ 2156 sb->s_flags |= MS_POSIXACL; 2157 } 2158 2159 nfs_initialise_sb(sb); 2160 } 2161 2162 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2163 { 2164 const struct nfs_server *a = s->s_fs_info; 2165 const struct rpc_clnt *clnt_a = a->client; 2166 const struct rpc_clnt *clnt_b = b->client; 2167 2168 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2169 goto Ebusy; 2170 if (a->nfs_client != b->nfs_client) 2171 goto Ebusy; 2172 if (a->flags != b->flags) 2173 goto Ebusy; 2174 if (a->wsize != b->wsize) 2175 goto Ebusy; 2176 if (a->rsize != b->rsize) 2177 goto Ebusy; 2178 if (a->acregmin != b->acregmin) 2179 goto Ebusy; 2180 if (a->acregmax != b->acregmax) 2181 goto Ebusy; 2182 if (a->acdirmin != b->acdirmin) 2183 goto Ebusy; 2184 if (a->acdirmax != b->acdirmax) 2185 goto Ebusy; 2186 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2187 goto Ebusy; 2188 return 1; 2189 Ebusy: 2190 return 0; 2191 } 2192 2193 struct nfs_sb_mountdata { 2194 struct nfs_server *server; 2195 int mntflags; 2196 }; 2197 2198 static int nfs_set_super(struct super_block *s, void *data) 2199 { 2200 struct nfs_sb_mountdata *sb_mntdata = data; 2201 struct nfs_server *server = sb_mntdata->server; 2202 int ret; 2203 2204 s->s_flags = sb_mntdata->mntflags; 2205 s->s_fs_info = server; 2206 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2207 ret = set_anon_super(s, server); 2208 if (ret == 0) 2209 server->s_dev = s->s_dev; 2210 return ret; 2211 } 2212 2213 static int nfs_compare_super_address(struct nfs_server *server1, 2214 struct nfs_server *server2) 2215 { 2216 struct sockaddr *sap1, *sap2; 2217 2218 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2219 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2220 2221 if (sap1->sa_family != sap2->sa_family) 2222 return 0; 2223 2224 switch (sap1->sa_family) { 2225 case AF_INET: { 2226 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2227 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2228 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2229 return 0; 2230 if (sin1->sin_port != sin2->sin_port) 2231 return 0; 2232 break; 2233 } 2234 case AF_INET6: { 2235 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2236 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2237 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2238 return 0; 2239 if (sin1->sin6_port != sin2->sin6_port) 2240 return 0; 2241 break; 2242 } 2243 default: 2244 return 0; 2245 } 2246 2247 return 1; 2248 } 2249 2250 static int nfs_compare_super(struct super_block *sb, void *data) 2251 { 2252 struct nfs_sb_mountdata *sb_mntdata = data; 2253 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2254 int mntflags = sb_mntdata->mntflags; 2255 2256 if (!nfs_compare_super_address(old, server)) 2257 return 0; 2258 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2259 if (old->flags & NFS_MOUNT_UNSHARED) 2260 return 0; 2261 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2262 return 0; 2263 return nfs_compare_mount_options(sb, server, mntflags); 2264 } 2265 2266 #ifdef CONFIG_NFS_FSCACHE 2267 static void nfs_get_cache_cookie(struct super_block *sb, 2268 struct nfs_parsed_mount_data *parsed, 2269 struct nfs_clone_mount *cloned) 2270 { 2271 char *uniq = NULL; 2272 int ulen = 0; 2273 2274 if (parsed && parsed->fscache_uniq) { 2275 uniq = parsed->fscache_uniq; 2276 ulen = strlen(parsed->fscache_uniq); 2277 } else if (cloned) { 2278 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2279 if (mnt_s->fscache_key) { 2280 uniq = mnt_s->fscache_key->key.uniquifier; 2281 ulen = mnt_s->fscache_key->key.uniq_len; 2282 }; 2283 } 2284 2285 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2286 } 2287 #else 2288 static void nfs_get_cache_cookie(struct super_block *sb, 2289 struct nfs_parsed_mount_data *parsed, 2290 struct nfs_clone_mount *cloned) 2291 { 2292 } 2293 #endif 2294 2295 static int nfs_bdi_register(struct nfs_server *server) 2296 { 2297 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2298 } 2299 2300 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2301 struct nfs_mount_info *mount_info) 2302 { 2303 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2304 } 2305 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2306 2307 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2308 struct nfs_mount_info *mount_info) 2309 { 2310 /* clone any lsm security options from the parent to the new sb */ 2311 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2312 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2313 return -ESTALE; 2314 return 0; 2315 } 2316 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2317 2318 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2319 int flags, const char *dev_name, 2320 struct nfs_mount_info *mount_info, 2321 struct nfs_subversion *nfs_mod) 2322 { 2323 struct super_block *s; 2324 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2325 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2326 struct nfs_sb_mountdata sb_mntdata = { 2327 .mntflags = flags, 2328 .server = server, 2329 }; 2330 int error; 2331 2332 if (server->flags & NFS_MOUNT_UNSHARED) 2333 compare_super = NULL; 2334 2335 /* -o noac implies -o sync */ 2336 if (server->flags & NFS_MOUNT_NOAC) 2337 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2338 2339 /* Get a superblock - note that we may end up sharing one that already exists */ 2340 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2341 if (IS_ERR(s)) { 2342 mntroot = ERR_CAST(s); 2343 goto out_err_nosb; 2344 } 2345 2346 if (s->s_fs_info != server) { 2347 nfs_free_server(server); 2348 server = NULL; 2349 } else { 2350 error = nfs_bdi_register(server); 2351 if (error) { 2352 mntroot = ERR_PTR(error); 2353 goto error_splat_bdi; 2354 } 2355 } 2356 2357 if (!s->s_root) { 2358 /* initial superblock/root creation */ 2359 mount_info->fill_super(s, mount_info); 2360 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2361 } 2362 2363 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2364 if (IS_ERR(mntroot)) 2365 goto error_splat_super; 2366 2367 error = mount_info->set_security(s, mntroot, mount_info); 2368 if (error) 2369 goto error_splat_root; 2370 2371 s->s_flags |= MS_ACTIVE; 2372 2373 out: 2374 return mntroot; 2375 2376 out_err_nosb: 2377 nfs_free_server(server); 2378 goto out; 2379 2380 error_splat_root: 2381 dput(mntroot); 2382 mntroot = ERR_PTR(error); 2383 error_splat_super: 2384 if (server && !s->s_root) 2385 bdi_unregister(&server->backing_dev_info); 2386 error_splat_bdi: 2387 deactivate_locked_super(s); 2388 goto out; 2389 } 2390 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2391 2392 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2393 int flags, const char *dev_name, void *raw_data) 2394 { 2395 struct nfs_mount_info mount_info = { 2396 .fill_super = nfs_fill_super, 2397 .set_security = nfs_set_sb_security, 2398 }; 2399 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2400 struct nfs_subversion *nfs_mod; 2401 int error; 2402 2403 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2404 mount_info.mntfh = nfs_alloc_fhandle(); 2405 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2406 goto out; 2407 2408 /* Validate the mount data */ 2409 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2410 if (error == NFS_TEXT_DATA) 2411 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2412 if (error < 0) { 2413 mntroot = ERR_PTR(error); 2414 goto out; 2415 } 2416 2417 nfs_mod = get_nfs_version(mount_info.parsed->version); 2418 if (IS_ERR(nfs_mod)) { 2419 mntroot = ERR_CAST(nfs_mod); 2420 goto out; 2421 } 2422 2423 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2424 2425 put_nfs_version(nfs_mod); 2426 out: 2427 nfs_free_parsed_mount_data(mount_info.parsed); 2428 nfs_free_fhandle(mount_info.mntfh); 2429 return mntroot; 2430 } 2431 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2432 2433 /* 2434 * Ensure that we unregister the bdi before kill_anon_super 2435 * releases the device name 2436 */ 2437 void nfs_put_super(struct super_block *s) 2438 { 2439 struct nfs_server *server = NFS_SB(s); 2440 2441 bdi_unregister(&server->backing_dev_info); 2442 } 2443 EXPORT_SYMBOL_GPL(nfs_put_super); 2444 2445 /* 2446 * Destroy an NFS2/3 superblock 2447 */ 2448 void nfs_kill_super(struct super_block *s) 2449 { 2450 struct nfs_server *server = NFS_SB(s); 2451 2452 kill_anon_super(s); 2453 nfs_fscache_release_super_cookie(s); 2454 nfs_free_server(server); 2455 } 2456 EXPORT_SYMBOL_GPL(nfs_kill_super); 2457 2458 /* 2459 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2460 */ 2461 struct dentry * 2462 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2463 const char *dev_name, void *raw_data) 2464 { 2465 struct nfs_clone_mount *data = raw_data; 2466 struct nfs_mount_info mount_info = { 2467 .fill_super = nfs_clone_super, 2468 .set_security = nfs_clone_sb_security, 2469 .cloned = data, 2470 }; 2471 struct nfs_server *server; 2472 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2473 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2474 int error; 2475 2476 dprintk("--> nfs_xdev_mount_common()\n"); 2477 2478 mount_info.mntfh = mount_info.cloned->fh; 2479 2480 /* create a new volume representation */ 2481 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2482 if (IS_ERR(server)) { 2483 error = PTR_ERR(server); 2484 goto out_err; 2485 } 2486 2487 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod); 2488 dprintk("<-- nfs_xdev_mount_common() = 0\n"); 2489 out: 2490 return mntroot; 2491 2492 out_err: 2493 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); 2494 goto out; 2495 } 2496 2497 #if IS_ENABLED(CONFIG_NFS_V4) 2498 2499 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2500 { 2501 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2502 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2503 } 2504 2505 /* 2506 * Validate NFSv4 mount options 2507 */ 2508 static int nfs4_validate_mount_data(void *options, 2509 struct nfs_parsed_mount_data *args, 2510 const char *dev_name) 2511 { 2512 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2513 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2514 char *c; 2515 2516 if (data == NULL) 2517 goto out_no_data; 2518 2519 args->version = 4; 2520 2521 switch (data->version) { 2522 case 1: 2523 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2524 goto out_no_address; 2525 if (data->host_addrlen == 0) 2526 goto out_no_address; 2527 args->nfs_server.addrlen = data->host_addrlen; 2528 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2529 return -EFAULT; 2530 if (!nfs_verify_server_address(sap)) 2531 goto out_no_address; 2532 2533 if (data->auth_flavourlen) { 2534 if (data->auth_flavourlen > 1) 2535 goto out_inval_auth; 2536 if (copy_from_user(&args->auth_flavors[0], 2537 data->auth_flavours, 2538 sizeof(args->auth_flavors[0]))) 2539 return -EFAULT; 2540 } 2541 2542 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2543 if (IS_ERR(c)) 2544 return PTR_ERR(c); 2545 args->nfs_server.hostname = c; 2546 2547 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2548 if (IS_ERR(c)) 2549 return PTR_ERR(c); 2550 args->nfs_server.export_path = c; 2551 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2552 2553 c = strndup_user(data->client_addr.data, 16); 2554 if (IS_ERR(c)) 2555 return PTR_ERR(c); 2556 args->client_address = c; 2557 2558 /* 2559 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2560 * can deal with. 2561 */ 2562 2563 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2564 args->rsize = data->rsize; 2565 args->wsize = data->wsize; 2566 args->timeo = data->timeo; 2567 args->retrans = data->retrans; 2568 args->acregmin = data->acregmin; 2569 args->acregmax = data->acregmax; 2570 args->acdirmin = data->acdirmin; 2571 args->acdirmax = data->acdirmax; 2572 args->nfs_server.protocol = data->proto; 2573 nfs_validate_transport_protocol(args); 2574 2575 break; 2576 default: 2577 return NFS_TEXT_DATA; 2578 } 2579 2580 return 0; 2581 2582 out_no_data: 2583 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2584 return -EINVAL; 2585 2586 out_inval_auth: 2587 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2588 data->auth_flavourlen); 2589 return -EINVAL; 2590 2591 out_no_address: 2592 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2593 return -EINVAL; 2594 } 2595 2596 /* 2597 * NFS v4 module parameters need to stay in the 2598 * NFS client for backwards compatibility 2599 */ 2600 unsigned int nfs_callback_set_tcpport; 2601 unsigned short nfs_callback_tcpport; 2602 /* Default cache timeout is 10 minutes */ 2603 unsigned int nfs_idmap_cache_timeout = 600; 2604 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2605 bool nfs4_disable_idmapping = true; 2606 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2607 unsigned short send_implementation_id = 1; 2608 2609 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2610 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2611 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2612 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2613 EXPORT_SYMBOL_GPL(max_session_slots); 2614 EXPORT_SYMBOL_GPL(send_implementation_id); 2615 2616 #define NFS_CALLBACK_MAXPORTNR (65535U) 2617 2618 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2619 { 2620 unsigned long num; 2621 int ret; 2622 2623 if (!val) 2624 return -EINVAL; 2625 ret = strict_strtoul(val, 0, &num); 2626 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2627 return -EINVAL; 2628 *((unsigned int *)kp->arg) = num; 2629 return 0; 2630 } 2631 static struct kernel_param_ops param_ops_portnr = { 2632 .set = param_set_portnr, 2633 .get = param_get_uint, 2634 }; 2635 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2636 2637 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2638 module_param(nfs_idmap_cache_timeout, int, 0644); 2639 module_param(nfs4_disable_idmapping, bool, 0644); 2640 MODULE_PARM_DESC(nfs4_disable_idmapping, 2641 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2642 module_param(max_session_slots, ushort, 0644); 2643 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2644 "requests the client will negotiate"); 2645 module_param(send_implementation_id, ushort, 0644); 2646 MODULE_PARM_DESC(send_implementation_id, 2647 "Send implementation ID with NFSv4.1 exchange_id"); 2648 #endif /* CONFIG_NFS_V4 */ 2649