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 68 #define NFSDBG_FACILITY NFSDBG_VFS 69 70 #ifdef CONFIG_NFS_V3 71 #define NFS_DEFAULT_VERSION 3 72 #else 73 #define NFS_DEFAULT_VERSION 2 74 #endif 75 76 enum { 77 /* Mount options that take no arguments */ 78 Opt_soft, Opt_hard, 79 Opt_posix, Opt_noposix, 80 Opt_cto, Opt_nocto, 81 Opt_ac, Opt_noac, 82 Opt_lock, Opt_nolock, 83 Opt_udp, Opt_tcp, Opt_rdma, 84 Opt_acl, Opt_noacl, 85 Opt_rdirplus, Opt_nordirplus, 86 Opt_sharecache, Opt_nosharecache, 87 Opt_resvport, Opt_noresvport, 88 Opt_fscache, Opt_nofscache, 89 90 /* Mount options that take integer arguments */ 91 Opt_port, 92 Opt_rsize, Opt_wsize, Opt_bsize, 93 Opt_timeo, Opt_retrans, 94 Opt_acregmin, Opt_acregmax, 95 Opt_acdirmin, Opt_acdirmax, 96 Opt_actimeo, 97 Opt_namelen, 98 Opt_mountport, 99 Opt_mountvers, 100 Opt_minorversion, 101 102 /* Mount options that take string arguments */ 103 Opt_nfsvers, 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 105 Opt_addr, Opt_mountaddr, Opt_clientaddr, 106 Opt_lookupcache, 107 Opt_fscache_uniq, 108 Opt_local_lock, 109 110 /* Special mount options */ 111 Opt_userspace, Opt_deprecated, Opt_sloppy, 112 113 Opt_err 114 }; 115 116 static const match_table_t nfs_mount_option_tokens = { 117 { Opt_userspace, "bg" }, 118 { Opt_userspace, "fg" }, 119 { Opt_userspace, "retry=%s" }, 120 121 { Opt_sloppy, "sloppy" }, 122 123 { Opt_soft, "soft" }, 124 { Opt_hard, "hard" }, 125 { Opt_deprecated, "intr" }, 126 { Opt_deprecated, "nointr" }, 127 { Opt_posix, "posix" }, 128 { Opt_noposix, "noposix" }, 129 { Opt_cto, "cto" }, 130 { Opt_nocto, "nocto" }, 131 { Opt_ac, "ac" }, 132 { Opt_noac, "noac" }, 133 { Opt_lock, "lock" }, 134 { Opt_nolock, "nolock" }, 135 { Opt_udp, "udp" }, 136 { Opt_tcp, "tcp" }, 137 { Opt_rdma, "rdma" }, 138 { Opt_acl, "acl" }, 139 { Opt_noacl, "noacl" }, 140 { Opt_rdirplus, "rdirplus" }, 141 { Opt_nordirplus, "nordirplus" }, 142 { Opt_sharecache, "sharecache" }, 143 { Opt_nosharecache, "nosharecache" }, 144 { Opt_resvport, "resvport" }, 145 { Opt_noresvport, "noresvport" }, 146 { Opt_fscache, "fsc" }, 147 { Opt_nofscache, "nofsc" }, 148 149 { Opt_port, "port=%s" }, 150 { Opt_rsize, "rsize=%s" }, 151 { Opt_wsize, "wsize=%s" }, 152 { Opt_bsize, "bsize=%s" }, 153 { Opt_timeo, "timeo=%s" }, 154 { Opt_retrans, "retrans=%s" }, 155 { Opt_acregmin, "acregmin=%s" }, 156 { Opt_acregmax, "acregmax=%s" }, 157 { Opt_acdirmin, "acdirmin=%s" }, 158 { Opt_acdirmax, "acdirmax=%s" }, 159 { Opt_actimeo, "actimeo=%s" }, 160 { Opt_namelen, "namlen=%s" }, 161 { Opt_mountport, "mountport=%s" }, 162 { Opt_mountvers, "mountvers=%s" }, 163 { Opt_minorversion, "minorversion=%s" }, 164 165 { Opt_nfsvers, "nfsvers=%s" }, 166 { Opt_nfsvers, "vers=%s" }, 167 168 { Opt_sec, "sec=%s" }, 169 { Opt_proto, "proto=%s" }, 170 { Opt_mountproto, "mountproto=%s" }, 171 { Opt_addr, "addr=%s" }, 172 { Opt_clientaddr, "clientaddr=%s" }, 173 { Opt_mounthost, "mounthost=%s" }, 174 { Opt_mountaddr, "mountaddr=%s" }, 175 176 { Opt_lookupcache, "lookupcache=%s" }, 177 { Opt_fscache_uniq, "fsc=%s" }, 178 { Opt_local_lock, "local_lock=%s" }, 179 180 /* The following needs to be listed after all other options */ 181 { Opt_nfsvers, "v%s" }, 182 183 { Opt_err, NULL } 184 }; 185 186 enum { 187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 188 189 Opt_xprt_err 190 }; 191 192 static const match_table_t nfs_xprt_protocol_tokens = { 193 { Opt_xprt_udp, "udp" }, 194 { Opt_xprt_udp6, "udp6" }, 195 { Opt_xprt_tcp, "tcp" }, 196 { Opt_xprt_tcp6, "tcp6" }, 197 { Opt_xprt_rdma, "rdma" }, 198 199 { Opt_xprt_err, NULL } 200 }; 201 202 enum { 203 Opt_sec_none, Opt_sec_sys, 204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 207 208 Opt_sec_err 209 }; 210 211 static const match_table_t nfs_secflavor_tokens = { 212 { Opt_sec_none, "none" }, 213 { Opt_sec_none, "null" }, 214 { Opt_sec_sys, "sys" }, 215 216 { Opt_sec_krb5, "krb5" }, 217 { Opt_sec_krb5i, "krb5i" }, 218 { Opt_sec_krb5p, "krb5p" }, 219 220 { Opt_sec_lkey, "lkey" }, 221 { Opt_sec_lkeyi, "lkeyi" }, 222 { Opt_sec_lkeyp, "lkeyp" }, 223 224 { Opt_sec_spkm, "spkm3" }, 225 { Opt_sec_spkmi, "spkm3i" }, 226 { Opt_sec_spkmp, "spkm3p" }, 227 228 { Opt_sec_err, NULL } 229 }; 230 231 enum { 232 Opt_lookupcache_all, Opt_lookupcache_positive, 233 Opt_lookupcache_none, 234 235 Opt_lookupcache_err 236 }; 237 238 static match_table_t nfs_lookupcache_tokens = { 239 { Opt_lookupcache_all, "all" }, 240 { Opt_lookupcache_positive, "pos" }, 241 { Opt_lookupcache_positive, "positive" }, 242 { Opt_lookupcache_none, "none" }, 243 244 { Opt_lookupcache_err, NULL } 245 }; 246 247 enum { 248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 249 Opt_local_lock_none, 250 251 Opt_local_lock_err 252 }; 253 254 static match_table_t nfs_local_lock_tokens = { 255 { Opt_local_lock_all, "all" }, 256 { Opt_local_lock_flock, "flock" }, 257 { Opt_local_lock_posix, "posix" }, 258 { Opt_local_lock_none, "none" }, 259 260 { Opt_local_lock_err, NULL } 261 }; 262 263 enum { 264 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 265 Opt_vers_4_1, 266 267 Opt_vers_err 268 }; 269 270 static match_table_t nfs_vers_tokens = { 271 { Opt_vers_2, "2" }, 272 { Opt_vers_3, "3" }, 273 { Opt_vers_4, "4" }, 274 { Opt_vers_4_0, "4.0" }, 275 { Opt_vers_4_1, "4.1" }, 276 277 { Opt_vers_err, NULL } 278 }; 279 280 static void nfs_umount_begin(struct super_block *); 281 static int nfs_statfs(struct dentry *, struct kstatfs *); 282 static int nfs_show_options(struct seq_file *, struct dentry *); 283 static int nfs_show_devname(struct seq_file *, struct dentry *); 284 static int nfs_show_path(struct seq_file *, struct dentry *); 285 static int nfs_show_stats(struct seq_file *, struct dentry *); 286 static struct dentry *nfs_fs_mount(struct file_system_type *, 287 int, const char *, void *); 288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data); 290 static void nfs_put_super(struct super_block *); 291 static void nfs_kill_super(struct super_block *); 292 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 293 294 static struct file_system_type nfs_fs_type = { 295 .owner = THIS_MODULE, 296 .name = "nfs", 297 .mount = nfs_fs_mount, 298 .kill_sb = nfs_kill_super, 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 300 }; 301 302 struct file_system_type nfs_xdev_fs_type = { 303 .owner = THIS_MODULE, 304 .name = "nfs", 305 .mount = nfs_xdev_mount, 306 .kill_sb = nfs_kill_super, 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 308 }; 309 310 static const struct super_operations nfs_sops = { 311 .alloc_inode = nfs_alloc_inode, 312 .destroy_inode = nfs_destroy_inode, 313 .write_inode = nfs_write_inode, 314 .put_super = nfs_put_super, 315 .statfs = nfs_statfs, 316 .evict_inode = nfs_evict_inode, 317 .umount_begin = nfs_umount_begin, 318 .show_options = nfs_show_options, 319 .show_devname = nfs_show_devname, 320 .show_path = nfs_show_path, 321 .show_stats = nfs_show_stats, 322 .remount_fs = nfs_remount, 323 }; 324 325 #ifdef CONFIG_NFS_V4 326 static int nfs4_validate_text_mount_data(void *options, 327 struct nfs_parsed_mount_data *args, const char *dev_name); 328 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 329 struct nfs_parsed_mount_data *data); 330 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 331 int flags, const char *dev_name, void *raw_data); 332 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 333 int flags, const char *dev_name, void *raw_data); 334 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 335 int flags, const char *dev_name, void *raw_data); 336 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 337 int flags, const char *dev_name, void *raw_data); 338 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 339 int flags, const char *dev_name, void *raw_data); 340 static void nfs4_kill_super(struct super_block *sb); 341 342 static struct file_system_type nfs4_fs_type = { 343 .owner = THIS_MODULE, 344 .name = "nfs4", 345 .mount = nfs4_mount, 346 .kill_sb = nfs4_kill_super, 347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 348 }; 349 350 static struct file_system_type nfs4_remote_fs_type = { 351 .owner = THIS_MODULE, 352 .name = "nfs4", 353 .mount = nfs4_remote_mount, 354 .kill_sb = nfs4_kill_super, 355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 356 }; 357 358 struct file_system_type nfs4_xdev_fs_type = { 359 .owner = THIS_MODULE, 360 .name = "nfs4", 361 .mount = nfs4_xdev_mount, 362 .kill_sb = nfs4_kill_super, 363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 364 }; 365 366 static struct file_system_type nfs4_remote_referral_fs_type = { 367 .owner = THIS_MODULE, 368 .name = "nfs4", 369 .mount = nfs4_remote_referral_mount, 370 .kill_sb = nfs4_kill_super, 371 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 372 }; 373 374 struct file_system_type nfs4_referral_fs_type = { 375 .owner = THIS_MODULE, 376 .name = "nfs4", 377 .mount = nfs4_referral_mount, 378 .kill_sb = nfs4_kill_super, 379 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 380 }; 381 382 static const struct super_operations nfs4_sops = { 383 .alloc_inode = nfs_alloc_inode, 384 .destroy_inode = nfs_destroy_inode, 385 .write_inode = nfs_write_inode, 386 .put_super = nfs_put_super, 387 .statfs = nfs_statfs, 388 .evict_inode = nfs4_evict_inode, 389 .umount_begin = nfs_umount_begin, 390 .show_options = nfs_show_options, 391 .show_devname = nfs_show_devname, 392 .show_path = nfs_show_path, 393 .show_stats = nfs_show_stats, 394 .remount_fs = nfs_remount, 395 }; 396 #endif 397 398 static struct shrinker acl_shrinker = { 399 .shrink = nfs_access_cache_shrinker, 400 .seeks = DEFAULT_SEEKS, 401 }; 402 403 /* 404 * Register the NFS filesystems 405 */ 406 int __init register_nfs_fs(void) 407 { 408 int ret; 409 410 ret = register_filesystem(&nfs_fs_type); 411 if (ret < 0) 412 goto error_0; 413 414 ret = nfs_register_sysctl(); 415 if (ret < 0) 416 goto error_1; 417 #ifdef CONFIG_NFS_V4 418 ret = register_filesystem(&nfs4_fs_type); 419 if (ret < 0) 420 goto error_2; 421 #endif 422 register_shrinker(&acl_shrinker); 423 return 0; 424 425 #ifdef CONFIG_NFS_V4 426 error_2: 427 nfs_unregister_sysctl(); 428 #endif 429 error_1: 430 unregister_filesystem(&nfs_fs_type); 431 error_0: 432 return ret; 433 } 434 435 /* 436 * Unregister the NFS filesystems 437 */ 438 void __exit unregister_nfs_fs(void) 439 { 440 unregister_shrinker(&acl_shrinker); 441 #ifdef CONFIG_NFS_V4 442 unregister_filesystem(&nfs4_fs_type); 443 #endif 444 nfs_unregister_sysctl(); 445 unregister_filesystem(&nfs_fs_type); 446 } 447 448 void nfs_sb_active(struct super_block *sb) 449 { 450 struct nfs_server *server = NFS_SB(sb); 451 452 if (atomic_inc_return(&server->active) == 1) 453 atomic_inc(&sb->s_active); 454 } 455 456 void nfs_sb_deactive(struct super_block *sb) 457 { 458 struct nfs_server *server = NFS_SB(sb); 459 460 if (atomic_dec_and_test(&server->active)) 461 deactivate_super(sb); 462 } 463 464 /* 465 * Deliver file system statistics to userspace 466 */ 467 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 468 { 469 struct nfs_server *server = NFS_SB(dentry->d_sb); 470 unsigned char blockbits; 471 unsigned long blockres; 472 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 473 struct nfs_fsstat res; 474 int error = -ENOMEM; 475 476 res.fattr = nfs_alloc_fattr(); 477 if (res.fattr == NULL) 478 goto out_err; 479 480 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 481 if (unlikely(error == -ESTALE)) { 482 struct dentry *pd_dentry; 483 484 pd_dentry = dget_parent(dentry); 485 if (pd_dentry != NULL) { 486 nfs_zap_caches(pd_dentry->d_inode); 487 dput(pd_dentry); 488 } 489 } 490 nfs_free_fattr(res.fattr); 491 if (error < 0) 492 goto out_err; 493 494 buf->f_type = NFS_SUPER_MAGIC; 495 496 /* 497 * Current versions of glibc do not correctly handle the 498 * case where f_frsize != f_bsize. Eventually we want to 499 * report the value of wtmult in this field. 500 */ 501 buf->f_frsize = dentry->d_sb->s_blocksize; 502 503 /* 504 * On most *nix systems, f_blocks, f_bfree, and f_bavail 505 * are reported in units of f_frsize. Linux hasn't had 506 * an f_frsize field in its statfs struct until recently, 507 * thus historically Linux's sys_statfs reports these 508 * fields in units of f_bsize. 509 */ 510 buf->f_bsize = dentry->d_sb->s_blocksize; 511 blockbits = dentry->d_sb->s_blocksize_bits; 512 blockres = (1 << blockbits) - 1; 513 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 514 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 515 buf->f_bavail = (res.abytes + blockres) >> blockbits; 516 517 buf->f_files = res.tfiles; 518 buf->f_ffree = res.afiles; 519 520 buf->f_namelen = server->namelen; 521 522 return 0; 523 524 out_err: 525 dprintk("%s: statfs error = %d\n", __func__, -error); 526 return error; 527 } 528 529 /* 530 * Map the security flavour number to a name 531 */ 532 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 533 { 534 static const struct { 535 rpc_authflavor_t flavour; 536 const char *str; 537 } sec_flavours[] = { 538 { RPC_AUTH_NULL, "null" }, 539 { RPC_AUTH_UNIX, "sys" }, 540 { RPC_AUTH_GSS_KRB5, "krb5" }, 541 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 542 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 543 { RPC_AUTH_GSS_LKEY, "lkey" }, 544 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 545 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 546 { RPC_AUTH_GSS_SPKM, "spkm" }, 547 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 548 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 549 { UINT_MAX, "unknown" } 550 }; 551 int i; 552 553 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 554 if (sec_flavours[i].flavour == flavour) 555 break; 556 } 557 return sec_flavours[i].str; 558 } 559 560 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 561 int showdefaults) 562 { 563 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 564 565 seq_printf(m, ",mountproto="); 566 switch (sap->sa_family) { 567 case AF_INET: 568 switch (nfss->mountd_protocol) { 569 case IPPROTO_UDP: 570 seq_printf(m, RPCBIND_NETID_UDP); 571 break; 572 case IPPROTO_TCP: 573 seq_printf(m, RPCBIND_NETID_TCP); 574 break; 575 default: 576 if (showdefaults) 577 seq_printf(m, "auto"); 578 } 579 break; 580 case AF_INET6: 581 switch (nfss->mountd_protocol) { 582 case IPPROTO_UDP: 583 seq_printf(m, RPCBIND_NETID_UDP6); 584 break; 585 case IPPROTO_TCP: 586 seq_printf(m, RPCBIND_NETID_TCP6); 587 break; 588 default: 589 if (showdefaults) 590 seq_printf(m, "auto"); 591 } 592 break; 593 default: 594 if (showdefaults) 595 seq_printf(m, "auto"); 596 } 597 } 598 599 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 600 int showdefaults) 601 { 602 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 603 604 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 605 return; 606 607 switch (sap->sa_family) { 608 case AF_INET: { 609 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 610 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 611 break; 612 } 613 case AF_INET6: { 614 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 615 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 616 break; 617 } 618 default: 619 if (showdefaults) 620 seq_printf(m, ",mountaddr=unspecified"); 621 } 622 623 if (nfss->mountd_version || showdefaults) 624 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 625 if ((nfss->mountd_port && 626 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 627 showdefaults) 628 seq_printf(m, ",mountport=%u", nfss->mountd_port); 629 630 nfs_show_mountd_netid(m, nfss, showdefaults); 631 } 632 633 #ifdef CONFIG_NFS_V4 634 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 635 int showdefaults) 636 { 637 struct nfs_client *clp = nfss->nfs_client; 638 639 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 640 } 641 #else 642 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 643 int showdefaults) 644 { 645 } 646 #endif 647 648 static void nfs_show_nfs_version(struct seq_file *m, 649 unsigned int version, 650 unsigned int minorversion) 651 { 652 seq_printf(m, ",vers=%u", version); 653 if (version == 4) 654 seq_printf(m, ".%u", minorversion); 655 } 656 657 /* 658 * Describe the mount options in force on this server representation 659 */ 660 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 661 int showdefaults) 662 { 663 static const struct proc_nfs_info { 664 int flag; 665 const char *str; 666 const char *nostr; 667 } nfs_info[] = { 668 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 669 { NFS_MOUNT_POSIX, ",posix", "" }, 670 { NFS_MOUNT_NOCTO, ",nocto", "" }, 671 { NFS_MOUNT_NOAC, ",noac", "" }, 672 { NFS_MOUNT_NONLM, ",nolock", "" }, 673 { NFS_MOUNT_NOACL, ",noacl", "" }, 674 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 675 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 676 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 677 { 0, NULL, NULL } 678 }; 679 const struct proc_nfs_info *nfs_infop; 680 struct nfs_client *clp = nfss->nfs_client; 681 u32 version = clp->rpc_ops->version; 682 int local_flock, local_fcntl; 683 684 nfs_show_nfs_version(m, version, clp->cl_minorversion); 685 seq_printf(m, ",rsize=%u", nfss->rsize); 686 seq_printf(m, ",wsize=%u", nfss->wsize); 687 if (nfss->bsize != 0) 688 seq_printf(m, ",bsize=%u", nfss->bsize); 689 seq_printf(m, ",namlen=%u", nfss->namelen); 690 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 691 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 692 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 693 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 694 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 695 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 696 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 697 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 698 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 699 if (nfss->flags & nfs_infop->flag) 700 seq_puts(m, nfs_infop->str); 701 else 702 seq_puts(m, nfs_infop->nostr); 703 } 704 rcu_read_lock(); 705 seq_printf(m, ",proto=%s", 706 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 707 rcu_read_unlock(); 708 if (version == 4) { 709 if (nfss->port != NFS_PORT) 710 seq_printf(m, ",port=%u", nfss->port); 711 } else 712 if (nfss->port) 713 seq_printf(m, ",port=%u", nfss->port); 714 715 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 716 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 717 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 718 719 if (version != 4) 720 nfs_show_mountd_options(m, nfss, showdefaults); 721 else 722 nfs_show_nfsv4_options(m, nfss, showdefaults); 723 724 if (nfss->options & NFS_OPTION_FSCACHE) 725 seq_printf(m, ",fsc"); 726 727 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 728 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 729 seq_printf(m, ",lookupcache=none"); 730 else 731 seq_printf(m, ",lookupcache=pos"); 732 } 733 734 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 735 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 736 737 if (!local_flock && !local_fcntl) 738 seq_printf(m, ",local_lock=none"); 739 else if (local_flock && local_fcntl) 740 seq_printf(m, ",local_lock=all"); 741 else if (local_flock) 742 seq_printf(m, ",local_lock=flock"); 743 else 744 seq_printf(m, ",local_lock=posix"); 745 } 746 747 /* 748 * Describe the mount options on this VFS mountpoint 749 */ 750 static int nfs_show_options(struct seq_file *m, struct dentry *root) 751 { 752 struct nfs_server *nfss = NFS_SB(root->d_sb); 753 754 nfs_show_mount_options(m, nfss, 0); 755 756 rcu_read_lock(); 757 seq_printf(m, ",addr=%s", 758 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 759 RPC_DISPLAY_ADDR)); 760 rcu_read_unlock(); 761 762 return 0; 763 } 764 765 #ifdef CONFIG_NFS_V4 766 #ifdef CONFIG_NFS_V4_1 767 static void show_sessions(struct seq_file *m, struct nfs_server *server) 768 { 769 if (nfs4_has_session(server->nfs_client)) 770 seq_printf(m, ",sessions"); 771 } 772 #else 773 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 774 #endif 775 #endif 776 777 #ifdef CONFIG_NFS_V4_1 778 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 779 { 780 seq_printf(m, ",pnfs="); 781 if (server->pnfs_curr_ld) 782 seq_printf(m, "%s", server->pnfs_curr_ld->name); 783 else 784 seq_printf(m, "not configured"); 785 } 786 787 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 788 { 789 if (nfss->nfs_client && nfss->nfs_client->impl_id) { 790 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id; 791 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 792 "date='%llu,%u'", 793 impl_id->name, impl_id->domain, 794 impl_id->date.seconds, impl_id->date.nseconds); 795 } 796 } 797 #else 798 #ifdef CONFIG_NFS_V4 799 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 800 { 801 } 802 #endif 803 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 804 { 805 } 806 #endif 807 808 static int nfs_show_devname(struct seq_file *m, struct dentry *root) 809 { 810 char *page = (char *) __get_free_page(GFP_KERNEL); 811 char *devname, *dummy; 812 int err = 0; 813 if (!page) 814 return -ENOMEM; 815 devname = nfs_path(&dummy, root, page, PAGE_SIZE); 816 if (IS_ERR(devname)) 817 err = PTR_ERR(devname); 818 else 819 seq_escape(m, devname, " \t\n\\"); 820 free_page((unsigned long)page); 821 return err; 822 } 823 824 static int nfs_show_path(struct seq_file *m, struct dentry *dentry) 825 { 826 seq_puts(m, "/"); 827 return 0; 828 } 829 830 /* 831 * Present statistical information for this VFS mountpoint 832 */ 833 static int nfs_show_stats(struct seq_file *m, struct dentry *root) 834 { 835 int i, cpu; 836 struct nfs_server *nfss = NFS_SB(root->d_sb); 837 struct rpc_auth *auth = nfss->client->cl_auth; 838 struct nfs_iostats totals = { }; 839 840 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 841 842 /* 843 * Display all mount option settings 844 */ 845 seq_printf(m, "\n\topts:\t"); 846 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 847 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 848 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 849 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 850 nfs_show_mount_options(m, nfss, 1); 851 852 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 853 854 show_implementation_id(m, nfss); 855 856 seq_printf(m, "\n\tcaps:\t"); 857 seq_printf(m, "caps=0x%x", nfss->caps); 858 seq_printf(m, ",wtmult=%u", nfss->wtmult); 859 seq_printf(m, ",dtsize=%u", nfss->dtsize); 860 seq_printf(m, ",bsize=%u", nfss->bsize); 861 seq_printf(m, ",namlen=%u", nfss->namelen); 862 863 #ifdef CONFIG_NFS_V4 864 if (nfss->nfs_client->rpc_ops->version == 4) { 865 seq_printf(m, "\n\tnfsv4:\t"); 866 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 867 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 868 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 869 show_sessions(m, nfss); 870 show_pnfs(m, nfss); 871 } 872 #endif 873 874 /* 875 * Display security flavor in effect for this mount 876 */ 877 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 878 if (auth->au_flavor) 879 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 880 881 /* 882 * Display superblock I/O counters 883 */ 884 for_each_possible_cpu(cpu) { 885 struct nfs_iostats *stats; 886 887 preempt_disable(); 888 stats = per_cpu_ptr(nfss->io_stats, cpu); 889 890 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 891 totals.events[i] += stats->events[i]; 892 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 893 totals.bytes[i] += stats->bytes[i]; 894 #ifdef CONFIG_NFS_FSCACHE 895 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 896 totals.fscache[i] += stats->fscache[i]; 897 #endif 898 899 preempt_enable(); 900 } 901 902 seq_printf(m, "\n\tevents:\t"); 903 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 904 seq_printf(m, "%lu ", totals.events[i]); 905 seq_printf(m, "\n\tbytes:\t"); 906 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 907 seq_printf(m, "%Lu ", totals.bytes[i]); 908 #ifdef CONFIG_NFS_FSCACHE 909 if (nfss->options & NFS_OPTION_FSCACHE) { 910 seq_printf(m, "\n\tfsc:\t"); 911 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 912 seq_printf(m, "%Lu ", totals.bytes[i]); 913 } 914 #endif 915 seq_printf(m, "\n"); 916 917 rpc_print_iostats(m, nfss->client); 918 919 return 0; 920 } 921 922 /* 923 * Begin unmount by attempting to remove all automounted mountpoints we added 924 * in response to xdev traversals and referrals 925 */ 926 static void nfs_umount_begin(struct super_block *sb) 927 { 928 struct nfs_server *server; 929 struct rpc_clnt *rpc; 930 931 server = NFS_SB(sb); 932 /* -EIO all pending I/O */ 933 rpc = server->client_acl; 934 if (!IS_ERR(rpc)) 935 rpc_killall_tasks(rpc); 936 rpc = server->client; 937 if (!IS_ERR(rpc)) 938 rpc_killall_tasks(rpc); 939 } 940 941 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 942 { 943 struct nfs_parsed_mount_data *data; 944 945 data = kzalloc(sizeof(*data), GFP_KERNEL); 946 if (data) { 947 data->acregmin = NFS_DEF_ACREGMIN; 948 data->acregmax = NFS_DEF_ACREGMAX; 949 data->acdirmin = NFS_DEF_ACDIRMIN; 950 data->acdirmax = NFS_DEF_ACDIRMAX; 951 data->mount_server.port = NFS_UNSPEC_PORT; 952 data->nfs_server.port = NFS_UNSPEC_PORT; 953 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 954 data->auth_flavors[0] = RPC_AUTH_UNIX; 955 data->auth_flavor_len = 1; 956 data->version = version; 957 data->minorversion = 0; 958 data->net = current->nsproxy->net_ns; 959 security_init_mnt_opts(&data->lsm_opts); 960 } 961 return data; 962 } 963 964 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 965 { 966 if (data) { 967 kfree(data->client_address); 968 kfree(data->mount_server.hostname); 969 kfree(data->nfs_server.export_path); 970 kfree(data->nfs_server.hostname); 971 kfree(data->fscache_uniq); 972 security_free_mnt_opts(&data->lsm_opts); 973 kfree(data); 974 } 975 } 976 977 /* 978 * Sanity-check a server address provided by the mount command. 979 * 980 * Address family must be initialized, and address must not be 981 * the ANY address for that family. 982 */ 983 static int nfs_verify_server_address(struct sockaddr *addr) 984 { 985 switch (addr->sa_family) { 986 case AF_INET: { 987 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 988 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 989 } 990 case AF_INET6: { 991 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 992 return !ipv6_addr_any(sa); 993 } 994 } 995 996 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 997 return 0; 998 } 999 1000 /* 1001 * Select between a default port value and a user-specified port value. 1002 * If a zero value is set, then autobind will be used. 1003 */ 1004 static void nfs_set_port(struct sockaddr *sap, int *port, 1005 const unsigned short default_port) 1006 { 1007 if (*port == NFS_UNSPEC_PORT) 1008 *port = default_port; 1009 1010 rpc_set_port(sap, *port); 1011 } 1012 1013 /* 1014 * Sanity check the NFS transport protocol. 1015 * 1016 */ 1017 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 1018 { 1019 switch (mnt->nfs_server.protocol) { 1020 case XPRT_TRANSPORT_UDP: 1021 case XPRT_TRANSPORT_TCP: 1022 case XPRT_TRANSPORT_RDMA: 1023 break; 1024 default: 1025 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1026 } 1027 } 1028 1029 /* 1030 * For text based NFSv2/v3 mounts, the mount protocol transport default 1031 * settings should depend upon the specified NFS transport. 1032 */ 1033 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1034 { 1035 nfs_validate_transport_protocol(mnt); 1036 1037 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1038 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1039 return; 1040 switch (mnt->nfs_server.protocol) { 1041 case XPRT_TRANSPORT_UDP: 1042 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1043 break; 1044 case XPRT_TRANSPORT_TCP: 1045 case XPRT_TRANSPORT_RDMA: 1046 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1047 } 1048 } 1049 1050 /* 1051 * Parse the value of the 'sec=' option. 1052 */ 1053 static int nfs_parse_security_flavors(char *value, 1054 struct nfs_parsed_mount_data *mnt) 1055 { 1056 substring_t args[MAX_OPT_ARGS]; 1057 1058 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1059 1060 switch (match_token(value, nfs_secflavor_tokens, args)) { 1061 case Opt_sec_none: 1062 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1063 break; 1064 case Opt_sec_sys: 1065 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1066 break; 1067 case Opt_sec_krb5: 1068 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1069 break; 1070 case Opt_sec_krb5i: 1071 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1072 break; 1073 case Opt_sec_krb5p: 1074 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1075 break; 1076 case Opt_sec_lkey: 1077 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1078 break; 1079 case Opt_sec_lkeyi: 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1081 break; 1082 case Opt_sec_lkeyp: 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1084 break; 1085 case Opt_sec_spkm: 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1087 break; 1088 case Opt_sec_spkmi: 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1090 break; 1091 case Opt_sec_spkmp: 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1093 break; 1094 default: 1095 return 0; 1096 } 1097 1098 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1099 mnt->auth_flavor_len = 1; 1100 return 1; 1101 } 1102 1103 static int nfs_parse_version_string(char *string, 1104 struct nfs_parsed_mount_data *mnt, 1105 substring_t *args) 1106 { 1107 mnt->flags &= ~NFS_MOUNT_VER3; 1108 switch (match_token(string, nfs_vers_tokens, args)) { 1109 case Opt_vers_2: 1110 mnt->version = 2; 1111 break; 1112 case Opt_vers_3: 1113 mnt->flags |= NFS_MOUNT_VER3; 1114 mnt->version = 3; 1115 break; 1116 case Opt_vers_4: 1117 /* Backward compatibility option. In future, 1118 * the mount program should always supply 1119 * a NFSv4 minor version number. 1120 */ 1121 mnt->version = 4; 1122 break; 1123 case Opt_vers_4_0: 1124 mnt->version = 4; 1125 mnt->minorversion = 0; 1126 break; 1127 case Opt_vers_4_1: 1128 mnt->version = 4; 1129 mnt->minorversion = 1; 1130 break; 1131 default: 1132 return 0; 1133 } 1134 return 1; 1135 } 1136 1137 static int nfs_get_option_str(substring_t args[], char **option) 1138 { 1139 kfree(*option); 1140 *option = match_strdup(args); 1141 return !option; 1142 } 1143 1144 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1145 { 1146 int rc; 1147 char *string; 1148 1149 string = match_strdup(args); 1150 if (string == NULL) 1151 return -ENOMEM; 1152 rc = strict_strtoul(string, 10, option); 1153 kfree(string); 1154 1155 return rc; 1156 } 1157 1158 /* 1159 * Error-check and convert a string of mount options from user space into 1160 * a data structure. The whole mount string is processed; bad options are 1161 * skipped as they are encountered. If there were no errors, return 1; 1162 * otherwise return 0 (zero). 1163 */ 1164 static int nfs_parse_mount_options(char *raw, 1165 struct nfs_parsed_mount_data *mnt) 1166 { 1167 char *p, *string, *secdata; 1168 int rc, sloppy = 0, invalid_option = 0; 1169 unsigned short protofamily = AF_UNSPEC; 1170 unsigned short mountfamily = AF_UNSPEC; 1171 1172 if (!raw) { 1173 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1174 return 1; 1175 } 1176 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1177 1178 secdata = alloc_secdata(); 1179 if (!secdata) 1180 goto out_nomem; 1181 1182 rc = security_sb_copy_data(raw, secdata); 1183 if (rc) 1184 goto out_security_failure; 1185 1186 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1187 if (rc) 1188 goto out_security_failure; 1189 1190 free_secdata(secdata); 1191 1192 while ((p = strsep(&raw, ",")) != NULL) { 1193 substring_t args[MAX_OPT_ARGS]; 1194 unsigned long option; 1195 int token; 1196 1197 if (!*p) 1198 continue; 1199 1200 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1201 1202 token = match_token(p, nfs_mount_option_tokens, args); 1203 switch (token) { 1204 1205 /* 1206 * boolean options: foo/nofoo 1207 */ 1208 case Opt_soft: 1209 mnt->flags |= NFS_MOUNT_SOFT; 1210 break; 1211 case Opt_hard: 1212 mnt->flags &= ~NFS_MOUNT_SOFT; 1213 break; 1214 case Opt_posix: 1215 mnt->flags |= NFS_MOUNT_POSIX; 1216 break; 1217 case Opt_noposix: 1218 mnt->flags &= ~NFS_MOUNT_POSIX; 1219 break; 1220 case Opt_cto: 1221 mnt->flags &= ~NFS_MOUNT_NOCTO; 1222 break; 1223 case Opt_nocto: 1224 mnt->flags |= NFS_MOUNT_NOCTO; 1225 break; 1226 case Opt_ac: 1227 mnt->flags &= ~NFS_MOUNT_NOAC; 1228 break; 1229 case Opt_noac: 1230 mnt->flags |= NFS_MOUNT_NOAC; 1231 break; 1232 case Opt_lock: 1233 mnt->flags &= ~NFS_MOUNT_NONLM; 1234 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1235 NFS_MOUNT_LOCAL_FCNTL); 1236 break; 1237 case Opt_nolock: 1238 mnt->flags |= NFS_MOUNT_NONLM; 1239 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1240 NFS_MOUNT_LOCAL_FCNTL); 1241 break; 1242 case Opt_udp: 1243 mnt->flags &= ~NFS_MOUNT_TCP; 1244 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1245 break; 1246 case Opt_tcp: 1247 mnt->flags |= NFS_MOUNT_TCP; 1248 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1249 break; 1250 case Opt_rdma: 1251 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1252 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1253 xprt_load_transport(p); 1254 break; 1255 case Opt_acl: 1256 mnt->flags &= ~NFS_MOUNT_NOACL; 1257 break; 1258 case Opt_noacl: 1259 mnt->flags |= NFS_MOUNT_NOACL; 1260 break; 1261 case Opt_rdirplus: 1262 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1263 break; 1264 case Opt_nordirplus: 1265 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1266 break; 1267 case Opt_sharecache: 1268 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1269 break; 1270 case Opt_nosharecache: 1271 mnt->flags |= NFS_MOUNT_UNSHARED; 1272 break; 1273 case Opt_resvport: 1274 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1275 break; 1276 case Opt_noresvport: 1277 mnt->flags |= NFS_MOUNT_NORESVPORT; 1278 break; 1279 case Opt_fscache: 1280 mnt->options |= NFS_OPTION_FSCACHE; 1281 kfree(mnt->fscache_uniq); 1282 mnt->fscache_uniq = NULL; 1283 break; 1284 case Opt_nofscache: 1285 mnt->options &= ~NFS_OPTION_FSCACHE; 1286 kfree(mnt->fscache_uniq); 1287 mnt->fscache_uniq = NULL; 1288 break; 1289 1290 /* 1291 * options that take numeric values 1292 */ 1293 case Opt_port: 1294 if (nfs_get_option_ul(args, &option) || 1295 option > USHRT_MAX) 1296 goto out_invalid_value; 1297 mnt->nfs_server.port = option; 1298 break; 1299 case Opt_rsize: 1300 if (nfs_get_option_ul(args, &option)) 1301 goto out_invalid_value; 1302 mnt->rsize = option; 1303 break; 1304 case Opt_wsize: 1305 if (nfs_get_option_ul(args, &option)) 1306 goto out_invalid_value; 1307 mnt->wsize = option; 1308 break; 1309 case Opt_bsize: 1310 if (nfs_get_option_ul(args, &option)) 1311 goto out_invalid_value; 1312 mnt->bsize = option; 1313 break; 1314 case Opt_timeo: 1315 if (nfs_get_option_ul(args, &option) || option == 0) 1316 goto out_invalid_value; 1317 mnt->timeo = option; 1318 break; 1319 case Opt_retrans: 1320 if (nfs_get_option_ul(args, &option) || option == 0) 1321 goto out_invalid_value; 1322 mnt->retrans = option; 1323 break; 1324 case Opt_acregmin: 1325 if (nfs_get_option_ul(args, &option)) 1326 goto out_invalid_value; 1327 mnt->acregmin = option; 1328 break; 1329 case Opt_acregmax: 1330 if (nfs_get_option_ul(args, &option)) 1331 goto out_invalid_value; 1332 mnt->acregmax = option; 1333 break; 1334 case Opt_acdirmin: 1335 if (nfs_get_option_ul(args, &option)) 1336 goto out_invalid_value; 1337 mnt->acdirmin = option; 1338 break; 1339 case Opt_acdirmax: 1340 if (nfs_get_option_ul(args, &option)) 1341 goto out_invalid_value; 1342 mnt->acdirmax = option; 1343 break; 1344 case Opt_actimeo: 1345 if (nfs_get_option_ul(args, &option)) 1346 goto out_invalid_value; 1347 mnt->acregmin = mnt->acregmax = 1348 mnt->acdirmin = mnt->acdirmax = option; 1349 break; 1350 case Opt_namelen: 1351 if (nfs_get_option_ul(args, &option)) 1352 goto out_invalid_value; 1353 mnt->namlen = option; 1354 break; 1355 case Opt_mountport: 1356 if (nfs_get_option_ul(args, &option) || 1357 option > USHRT_MAX) 1358 goto out_invalid_value; 1359 mnt->mount_server.port = option; 1360 break; 1361 case Opt_mountvers: 1362 if (nfs_get_option_ul(args, &option) || 1363 option < NFS_MNT_VERSION || 1364 option > NFS_MNT3_VERSION) 1365 goto out_invalid_value; 1366 mnt->mount_server.version = option; 1367 break; 1368 case Opt_minorversion: 1369 if (nfs_get_option_ul(args, &option)) 1370 goto out_invalid_value; 1371 if (option > NFS4_MAX_MINOR_VERSION) 1372 goto out_invalid_value; 1373 mnt->minorversion = option; 1374 break; 1375 1376 /* 1377 * options that take text values 1378 */ 1379 case Opt_nfsvers: 1380 string = match_strdup(args); 1381 if (string == NULL) 1382 goto out_nomem; 1383 rc = nfs_parse_version_string(string, mnt, args); 1384 kfree(string); 1385 if (!rc) 1386 goto out_invalid_value; 1387 break; 1388 case Opt_sec: 1389 string = match_strdup(args); 1390 if (string == NULL) 1391 goto out_nomem; 1392 rc = nfs_parse_security_flavors(string, mnt); 1393 kfree(string); 1394 if (!rc) { 1395 dfprintk(MOUNT, "NFS: unrecognized " 1396 "security flavor\n"); 1397 return 0; 1398 } 1399 break; 1400 case Opt_proto: 1401 string = match_strdup(args); 1402 if (string == NULL) 1403 goto out_nomem; 1404 token = match_token(string, 1405 nfs_xprt_protocol_tokens, args); 1406 1407 protofamily = AF_INET; 1408 switch (token) { 1409 case Opt_xprt_udp6: 1410 protofamily = AF_INET6; 1411 case Opt_xprt_udp: 1412 mnt->flags &= ~NFS_MOUNT_TCP; 1413 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1414 break; 1415 case Opt_xprt_tcp6: 1416 protofamily = AF_INET6; 1417 case Opt_xprt_tcp: 1418 mnt->flags |= NFS_MOUNT_TCP; 1419 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1420 break; 1421 case Opt_xprt_rdma: 1422 /* vector side protocols to TCP */ 1423 mnt->flags |= NFS_MOUNT_TCP; 1424 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1425 xprt_load_transport(string); 1426 break; 1427 default: 1428 dfprintk(MOUNT, "NFS: unrecognized " 1429 "transport protocol\n"); 1430 kfree(string); 1431 return 0; 1432 } 1433 kfree(string); 1434 break; 1435 case Opt_mountproto: 1436 string = match_strdup(args); 1437 if (string == NULL) 1438 goto out_nomem; 1439 token = match_token(string, 1440 nfs_xprt_protocol_tokens, args); 1441 kfree(string); 1442 1443 mountfamily = AF_INET; 1444 switch (token) { 1445 case Opt_xprt_udp6: 1446 mountfamily = AF_INET6; 1447 case Opt_xprt_udp: 1448 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1449 break; 1450 case Opt_xprt_tcp6: 1451 mountfamily = AF_INET6; 1452 case Opt_xprt_tcp: 1453 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1454 break; 1455 case Opt_xprt_rdma: /* not used for side protocols */ 1456 default: 1457 dfprintk(MOUNT, "NFS: unrecognized " 1458 "transport protocol\n"); 1459 return 0; 1460 } 1461 break; 1462 case Opt_addr: 1463 string = match_strdup(args); 1464 if (string == NULL) 1465 goto out_nomem; 1466 mnt->nfs_server.addrlen = 1467 rpc_pton(mnt->net, string, strlen(string), 1468 (struct sockaddr *) 1469 &mnt->nfs_server.address, 1470 sizeof(mnt->nfs_server.address)); 1471 kfree(string); 1472 if (mnt->nfs_server.addrlen == 0) 1473 goto out_invalid_address; 1474 break; 1475 case Opt_clientaddr: 1476 if (nfs_get_option_str(args, &mnt->client_address)) 1477 goto out_nomem; 1478 break; 1479 case Opt_mounthost: 1480 if (nfs_get_option_str(args, 1481 &mnt->mount_server.hostname)) 1482 goto out_nomem; 1483 break; 1484 case Opt_mountaddr: 1485 string = match_strdup(args); 1486 if (string == NULL) 1487 goto out_nomem; 1488 mnt->mount_server.addrlen = 1489 rpc_pton(mnt->net, string, strlen(string), 1490 (struct sockaddr *) 1491 &mnt->mount_server.address, 1492 sizeof(mnt->mount_server.address)); 1493 kfree(string); 1494 if (mnt->mount_server.addrlen == 0) 1495 goto out_invalid_address; 1496 break; 1497 case Opt_lookupcache: 1498 string = match_strdup(args); 1499 if (string == NULL) 1500 goto out_nomem; 1501 token = match_token(string, 1502 nfs_lookupcache_tokens, args); 1503 kfree(string); 1504 switch (token) { 1505 case Opt_lookupcache_all: 1506 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1507 break; 1508 case Opt_lookupcache_positive: 1509 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1510 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1511 break; 1512 case Opt_lookupcache_none: 1513 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1514 break; 1515 default: 1516 dfprintk(MOUNT, "NFS: invalid " 1517 "lookupcache argument\n"); 1518 return 0; 1519 }; 1520 break; 1521 case Opt_fscache_uniq: 1522 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1523 goto out_nomem; 1524 mnt->options |= NFS_OPTION_FSCACHE; 1525 break; 1526 case Opt_local_lock: 1527 string = match_strdup(args); 1528 if (string == NULL) 1529 goto out_nomem; 1530 token = match_token(string, nfs_local_lock_tokens, 1531 args); 1532 kfree(string); 1533 switch (token) { 1534 case Opt_local_lock_all: 1535 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1536 NFS_MOUNT_LOCAL_FCNTL); 1537 break; 1538 case Opt_local_lock_flock: 1539 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1540 break; 1541 case Opt_local_lock_posix: 1542 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1543 break; 1544 case Opt_local_lock_none: 1545 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1546 NFS_MOUNT_LOCAL_FCNTL); 1547 break; 1548 default: 1549 dfprintk(MOUNT, "NFS: invalid " 1550 "local_lock argument\n"); 1551 return 0; 1552 }; 1553 break; 1554 1555 /* 1556 * Special options 1557 */ 1558 case Opt_sloppy: 1559 sloppy = 1; 1560 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1561 break; 1562 case Opt_userspace: 1563 case Opt_deprecated: 1564 dfprintk(MOUNT, "NFS: ignoring mount option " 1565 "'%s'\n", p); 1566 break; 1567 1568 default: 1569 invalid_option = 1; 1570 dfprintk(MOUNT, "NFS: unrecognized mount option " 1571 "'%s'\n", p); 1572 } 1573 } 1574 1575 if (!sloppy && invalid_option) 1576 return 0; 1577 1578 if (mnt->minorversion && mnt->version != 4) 1579 goto out_minorversion_mismatch; 1580 1581 /* 1582 * verify that any proto=/mountproto= options match the address 1583 * familiies in the addr=/mountaddr= options. 1584 */ 1585 if (protofamily != AF_UNSPEC && 1586 protofamily != mnt->nfs_server.address.ss_family) 1587 goto out_proto_mismatch; 1588 1589 if (mountfamily != AF_UNSPEC) { 1590 if (mnt->mount_server.addrlen) { 1591 if (mountfamily != mnt->mount_server.address.ss_family) 1592 goto out_mountproto_mismatch; 1593 } else { 1594 if (mountfamily != mnt->nfs_server.address.ss_family) 1595 goto out_mountproto_mismatch; 1596 } 1597 } 1598 1599 return 1; 1600 1601 out_mountproto_mismatch: 1602 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1603 "option\n"); 1604 return 0; 1605 out_proto_mismatch: 1606 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1607 return 0; 1608 out_invalid_address: 1609 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1610 return 0; 1611 out_invalid_value: 1612 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1613 return 0; 1614 out_minorversion_mismatch: 1615 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1616 "minorversion=%u\n", mnt->version, mnt->minorversion); 1617 return 0; 1618 out_nomem: 1619 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1620 return 0; 1621 out_security_failure: 1622 free_secdata(secdata); 1623 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1624 return 0; 1625 } 1626 1627 /* 1628 * Match the requested auth flavors with the list returned by 1629 * the server. Returns zero and sets the mount's authentication 1630 * flavor on success; returns -EACCES if server does not support 1631 * the requested flavor. 1632 */ 1633 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1634 struct nfs_mount_request *request) 1635 { 1636 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1637 1638 /* 1639 * Certain releases of Linux's mountd return an empty 1640 * flavor list. To prevent behavioral regression with 1641 * these servers (ie. rejecting mounts that used to 1642 * succeed), revert to pre-2.6.32 behavior (no checking) 1643 * if the returned flavor list is empty. 1644 */ 1645 if (server_authlist_len == 0) 1646 return 0; 1647 1648 /* 1649 * We avoid sophisticated negotiating here, as there are 1650 * plenty of cases where we can get it wrong, providing 1651 * either too little or too much security. 1652 * 1653 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1654 * flavor listed first. However, some servers list 1655 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1656 * preferred default, in args->auth_flavors[0] if user 1657 * didn't specify sec= mount option. 1658 */ 1659 for (i = 0; i < args->auth_flavor_len; i++) 1660 for (j = 0; j < server_authlist_len; j++) 1661 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1662 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1663 request->auth_flavs[j]); 1664 args->auth_flavors[0] = request->auth_flavs[j]; 1665 return 0; 1666 } 1667 1668 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1669 nfs_umount(request); 1670 return -EACCES; 1671 } 1672 1673 /* 1674 * Use the remote server's MOUNT service to request the NFS file handle 1675 * corresponding to the provided path. 1676 */ 1677 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1678 struct nfs_fh *root_fh) 1679 { 1680 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1681 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1682 struct nfs_mount_request request = { 1683 .sap = (struct sockaddr *) 1684 &args->mount_server.address, 1685 .dirpath = args->nfs_server.export_path, 1686 .protocol = args->mount_server.protocol, 1687 .fh = root_fh, 1688 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1689 .auth_flav_len = &server_authlist_len, 1690 .auth_flavs = server_authlist, 1691 .net = args->net, 1692 }; 1693 int status; 1694 1695 if (args->mount_server.version == 0) { 1696 switch (args->version) { 1697 default: 1698 args->mount_server.version = NFS_MNT3_VERSION; 1699 break; 1700 case 2: 1701 args->mount_server.version = NFS_MNT_VERSION; 1702 } 1703 } 1704 request.version = args->mount_server.version; 1705 1706 if (args->mount_server.hostname) 1707 request.hostname = args->mount_server.hostname; 1708 else 1709 request.hostname = args->nfs_server.hostname; 1710 1711 /* 1712 * Construct the mount server's address. 1713 */ 1714 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1715 memcpy(request.sap, &args->nfs_server.address, 1716 args->nfs_server.addrlen); 1717 args->mount_server.addrlen = args->nfs_server.addrlen; 1718 } 1719 request.salen = args->mount_server.addrlen; 1720 nfs_set_port(request.sap, &args->mount_server.port, 0); 1721 1722 /* 1723 * Now ask the mount server to map our export path 1724 * to a file handle. 1725 */ 1726 status = nfs_mount(&request); 1727 if (status != 0) { 1728 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1729 request.hostname, status); 1730 return status; 1731 } 1732 1733 /* 1734 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1735 */ 1736 if (args->mount_server.version != NFS_MNT3_VERSION) 1737 return 0; 1738 return nfs_walk_authlist(args, &request); 1739 } 1740 1741 /* 1742 * Split "dev_name" into "hostname:export_path". 1743 * 1744 * The leftmost colon demarks the split between the server's hostname 1745 * and the export path. If the hostname starts with a left square 1746 * bracket, then it may contain colons. 1747 * 1748 * Note: caller frees hostname and export path, even on error. 1749 */ 1750 static int nfs_parse_devname(const char *dev_name, 1751 char **hostname, size_t maxnamlen, 1752 char **export_path, size_t maxpathlen) 1753 { 1754 size_t len; 1755 char *end; 1756 1757 /* Is the host name protected with square brakcets? */ 1758 if (*dev_name == '[') { 1759 end = strchr(++dev_name, ']'); 1760 if (end == NULL || end[1] != ':') 1761 goto out_bad_devname; 1762 1763 len = end - dev_name; 1764 end++; 1765 } else { 1766 char *comma; 1767 1768 end = strchr(dev_name, ':'); 1769 if (end == NULL) 1770 goto out_bad_devname; 1771 len = end - dev_name; 1772 1773 /* kill possible hostname list: not supported */ 1774 comma = strchr(dev_name, ','); 1775 if (comma != NULL && comma < end) 1776 *comma = 0; 1777 } 1778 1779 if (len > maxnamlen) 1780 goto out_hostname; 1781 1782 /* N.B. caller will free nfs_server.hostname in all cases */ 1783 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1784 if (*hostname == NULL) 1785 goto out_nomem; 1786 len = strlen(++end); 1787 if (len > maxpathlen) 1788 goto out_path; 1789 *export_path = kstrndup(end, len, GFP_KERNEL); 1790 if (!*export_path) 1791 goto out_nomem; 1792 1793 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1794 return 0; 1795 1796 out_bad_devname: 1797 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1798 return -EINVAL; 1799 1800 out_nomem: 1801 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1802 return -ENOMEM; 1803 1804 out_hostname: 1805 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1806 return -ENAMETOOLONG; 1807 1808 out_path: 1809 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1810 return -ENAMETOOLONG; 1811 } 1812 1813 /* 1814 * Validate the NFS2/NFS3 mount data 1815 * - fills in the mount root filehandle 1816 * 1817 * For option strings, user space handles the following behaviors: 1818 * 1819 * + DNS: mapping server host name to IP address ("addr=" option) 1820 * 1821 * + failure mode: how to behave if a mount request can't be handled 1822 * immediately ("fg/bg" option) 1823 * 1824 * + retry: how often to retry a mount request ("retry=" option) 1825 * 1826 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1827 * mountproto=tcp after mountproto=udp, and so on 1828 */ 1829 static int nfs_validate_mount_data(void *options, 1830 struct nfs_parsed_mount_data *args, 1831 struct nfs_fh *mntfh, 1832 const char *dev_name) 1833 { 1834 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1835 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1836 1837 if (data == NULL) 1838 goto out_no_data; 1839 1840 switch (data->version) { 1841 case 1: 1842 data->namlen = 0; 1843 case 2: 1844 data->bsize = 0; 1845 case 3: 1846 if (data->flags & NFS_MOUNT_VER3) 1847 goto out_no_v3; 1848 data->root.size = NFS2_FHSIZE; 1849 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1850 case 4: 1851 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1852 goto out_no_sec; 1853 case 5: 1854 memset(data->context, 0, sizeof(data->context)); 1855 case 6: 1856 if (data->flags & NFS_MOUNT_VER3) { 1857 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1858 goto out_invalid_fh; 1859 mntfh->size = data->root.size; 1860 args->version = 3; 1861 } else { 1862 mntfh->size = NFS2_FHSIZE; 1863 args->version = 2; 1864 } 1865 1866 1867 memcpy(mntfh->data, data->root.data, mntfh->size); 1868 if (mntfh->size < sizeof(mntfh->data)) 1869 memset(mntfh->data + mntfh->size, 0, 1870 sizeof(mntfh->data) - mntfh->size); 1871 1872 /* 1873 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1874 * can deal with. 1875 */ 1876 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1877 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1878 args->rsize = data->rsize; 1879 args->wsize = data->wsize; 1880 args->timeo = data->timeo; 1881 args->retrans = data->retrans; 1882 args->acregmin = data->acregmin; 1883 args->acregmax = data->acregmax; 1884 args->acdirmin = data->acdirmin; 1885 args->acdirmax = data->acdirmax; 1886 1887 memcpy(sap, &data->addr, sizeof(data->addr)); 1888 args->nfs_server.addrlen = sizeof(data->addr); 1889 if (!nfs_verify_server_address(sap)) 1890 goto out_no_address; 1891 1892 if (!(data->flags & NFS_MOUNT_TCP)) 1893 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1894 /* N.B. caller will free nfs_server.hostname in all cases */ 1895 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1896 args->namlen = data->namlen; 1897 args->bsize = data->bsize; 1898 1899 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1900 args->auth_flavors[0] = data->pseudoflavor; 1901 if (!args->nfs_server.hostname) 1902 goto out_nomem; 1903 1904 if (!(data->flags & NFS_MOUNT_NONLM)) 1905 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1906 NFS_MOUNT_LOCAL_FCNTL); 1907 else 1908 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1909 NFS_MOUNT_LOCAL_FCNTL); 1910 /* 1911 * The legacy version 6 binary mount data from userspace has a 1912 * field used only to transport selinux information into the 1913 * the kernel. To continue to support that functionality we 1914 * have a touch of selinux knowledge here in the NFS code. The 1915 * userspace code converted context=blah to just blah so we are 1916 * converting back to the full string selinux understands. 1917 */ 1918 if (data->context[0]){ 1919 #ifdef CONFIG_SECURITY_SELINUX 1920 int rc; 1921 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1922 if (!opts_str) 1923 return -ENOMEM; 1924 strcpy(opts_str, "context="); 1925 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1926 strcat(opts_str, &data->context[0]); 1927 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1928 kfree(opts_str); 1929 if (rc) 1930 return rc; 1931 #else 1932 return -EINVAL; 1933 #endif 1934 } 1935 1936 break; 1937 default: { 1938 int status; 1939 1940 if (nfs_parse_mount_options((char *)options, args) == 0) 1941 return -EINVAL; 1942 1943 if (!nfs_verify_server_address(sap)) 1944 goto out_no_address; 1945 1946 if (args->version == 4) 1947 #ifdef CONFIG_NFS_V4 1948 return nfs4_validate_text_mount_data(options, 1949 args, dev_name); 1950 #else 1951 goto out_v4_not_compiled; 1952 #endif 1953 1954 nfs_set_port(sap, &args->nfs_server.port, 0); 1955 1956 nfs_set_mount_transport_protocol(args); 1957 1958 status = nfs_parse_devname(dev_name, 1959 &args->nfs_server.hostname, 1960 PAGE_SIZE, 1961 &args->nfs_server.export_path, 1962 NFS_MAXPATHLEN); 1963 if (!status) 1964 status = nfs_try_mount(args, mntfh); 1965 1966 kfree(args->nfs_server.export_path); 1967 args->nfs_server.export_path = NULL; 1968 1969 if (status) 1970 return status; 1971 1972 break; 1973 } 1974 } 1975 1976 #ifndef CONFIG_NFS_V3 1977 if (args->version == 3) 1978 goto out_v3_not_compiled; 1979 #endif /* !CONFIG_NFS_V3 */ 1980 1981 return 0; 1982 1983 out_no_data: 1984 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1985 return -EINVAL; 1986 1987 out_no_v3: 1988 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1989 data->version); 1990 return -EINVAL; 1991 1992 out_no_sec: 1993 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1994 return -EINVAL; 1995 1996 #ifndef CONFIG_NFS_V3 1997 out_v3_not_compiled: 1998 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1999 return -EPROTONOSUPPORT; 2000 #endif /* !CONFIG_NFS_V3 */ 2001 2002 #ifndef CONFIG_NFS_V4 2003 out_v4_not_compiled: 2004 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2005 return -EPROTONOSUPPORT; 2006 #endif /* !CONFIG_NFS_V4 */ 2007 2008 out_nomem: 2009 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2010 return -ENOMEM; 2011 2012 out_no_address: 2013 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2014 return -EINVAL; 2015 2016 out_invalid_fh: 2017 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2018 return -EINVAL; 2019 } 2020 2021 static int 2022 nfs_compare_remount_data(struct nfs_server *nfss, 2023 struct nfs_parsed_mount_data *data) 2024 { 2025 if (data->flags != nfss->flags || 2026 data->rsize != nfss->rsize || 2027 data->wsize != nfss->wsize || 2028 data->retrans != nfss->client->cl_timeout->to_retries || 2029 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2030 data->acregmin != nfss->acregmin / HZ || 2031 data->acregmax != nfss->acregmax / HZ || 2032 data->acdirmin != nfss->acdirmin / HZ || 2033 data->acdirmax != nfss->acdirmax / HZ || 2034 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2035 data->nfs_server.port != nfss->port || 2036 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2037 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2038 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2039 return -EINVAL; 2040 2041 return 0; 2042 } 2043 2044 static int 2045 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2046 { 2047 int error; 2048 struct nfs_server *nfss = sb->s_fs_info; 2049 struct nfs_parsed_mount_data *data; 2050 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2051 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2052 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2053 2054 /* 2055 * Userspace mount programs that send binary options generally send 2056 * them populated with default values. We have no way to know which 2057 * ones were explicitly specified. Fall back to legacy behavior and 2058 * just return success. 2059 */ 2060 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2061 (nfsvers <= 3 && (!options || (options->version >= 1 && 2062 options->version <= 6)))) 2063 return 0; 2064 2065 data = kzalloc(sizeof(*data), GFP_KERNEL); 2066 if (data == NULL) 2067 return -ENOMEM; 2068 2069 /* fill out struct with values from existing mount */ 2070 data->flags = nfss->flags; 2071 data->rsize = nfss->rsize; 2072 data->wsize = nfss->wsize; 2073 data->retrans = nfss->client->cl_timeout->to_retries; 2074 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2075 data->acregmin = nfss->acregmin / HZ; 2076 data->acregmax = nfss->acregmax / HZ; 2077 data->acdirmin = nfss->acdirmin / HZ; 2078 data->acdirmax = nfss->acdirmax / HZ; 2079 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2080 data->nfs_server.port = nfss->port; 2081 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2082 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2083 data->nfs_server.addrlen); 2084 2085 /* overwrite those values with any that were specified */ 2086 error = nfs_parse_mount_options((char *)options, data); 2087 if (error < 0) 2088 goto out; 2089 2090 /* 2091 * noac is a special case. It implies -o sync, but that's not 2092 * necessarily reflected in the mtab options. do_remount_sb 2093 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2094 * remount options, so we have to explicitly reset it. 2095 */ 2096 if (data->flags & NFS_MOUNT_NOAC) 2097 *flags |= MS_SYNCHRONOUS; 2098 2099 /* compare new mount options with old ones */ 2100 error = nfs_compare_remount_data(nfss, data); 2101 out: 2102 kfree(data); 2103 return error; 2104 } 2105 2106 /* 2107 * Initialise the common bits of the superblock 2108 */ 2109 static inline void nfs_initialise_sb(struct super_block *sb) 2110 { 2111 struct nfs_server *server = NFS_SB(sb); 2112 2113 sb->s_magic = NFS_SUPER_MAGIC; 2114 2115 /* We probably want something more informative here */ 2116 snprintf(sb->s_id, sizeof(sb->s_id), 2117 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2118 2119 if (sb->s_blocksize == 0) 2120 sb->s_blocksize = nfs_block_bits(server->wsize, 2121 &sb->s_blocksize_bits); 2122 2123 sb->s_bdi = &server->backing_dev_info; 2124 2125 nfs_super_set_maxbytes(sb, server->maxfilesize); 2126 } 2127 2128 /* 2129 * Finish setting up an NFS2/3 superblock 2130 */ 2131 static void nfs_fill_super(struct super_block *sb, 2132 struct nfs_parsed_mount_data *data) 2133 { 2134 struct nfs_server *server = NFS_SB(sb); 2135 2136 sb->s_blocksize_bits = 0; 2137 sb->s_blocksize = 0; 2138 if (data->bsize) 2139 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2140 2141 if (server->nfs_client->rpc_ops->version == 3) { 2142 /* The VFS shouldn't apply the umask to mode bits. We will do 2143 * so ourselves when necessary. 2144 */ 2145 sb->s_flags |= MS_POSIXACL; 2146 sb->s_time_gran = 1; 2147 } 2148 2149 sb->s_op = &nfs_sops; 2150 nfs_initialise_sb(sb); 2151 } 2152 2153 /* 2154 * Finish setting up a cloned NFS2/3 superblock 2155 */ 2156 static void nfs_clone_super(struct super_block *sb, 2157 const struct super_block *old_sb) 2158 { 2159 struct nfs_server *server = NFS_SB(sb); 2160 2161 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2162 sb->s_blocksize = old_sb->s_blocksize; 2163 sb->s_maxbytes = old_sb->s_maxbytes; 2164 2165 if (server->nfs_client->rpc_ops->version == 3) { 2166 /* The VFS shouldn't apply the umask to mode bits. We will do 2167 * so ourselves when necessary. 2168 */ 2169 sb->s_flags |= MS_POSIXACL; 2170 sb->s_time_gran = 1; 2171 } 2172 2173 sb->s_op = old_sb->s_op; 2174 nfs_initialise_sb(sb); 2175 } 2176 2177 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2178 { 2179 const struct nfs_server *a = s->s_fs_info; 2180 const struct rpc_clnt *clnt_a = a->client; 2181 const struct rpc_clnt *clnt_b = b->client; 2182 2183 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2184 goto Ebusy; 2185 if (a->nfs_client != b->nfs_client) 2186 goto Ebusy; 2187 if (a->flags != b->flags) 2188 goto Ebusy; 2189 if (a->wsize != b->wsize) 2190 goto Ebusy; 2191 if (a->rsize != b->rsize) 2192 goto Ebusy; 2193 if (a->acregmin != b->acregmin) 2194 goto Ebusy; 2195 if (a->acregmax != b->acregmax) 2196 goto Ebusy; 2197 if (a->acdirmin != b->acdirmin) 2198 goto Ebusy; 2199 if (a->acdirmax != b->acdirmax) 2200 goto Ebusy; 2201 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2202 goto Ebusy; 2203 return 1; 2204 Ebusy: 2205 return 0; 2206 } 2207 2208 struct nfs_sb_mountdata { 2209 struct nfs_server *server; 2210 int mntflags; 2211 }; 2212 2213 static int nfs_set_super(struct super_block *s, void *data) 2214 { 2215 struct nfs_sb_mountdata *sb_mntdata = data; 2216 struct nfs_server *server = sb_mntdata->server; 2217 int ret; 2218 2219 s->s_flags = sb_mntdata->mntflags; 2220 s->s_fs_info = server; 2221 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2222 ret = set_anon_super(s, server); 2223 if (ret == 0) 2224 server->s_dev = s->s_dev; 2225 return ret; 2226 } 2227 2228 static int nfs_compare_super_address(struct nfs_server *server1, 2229 struct nfs_server *server2) 2230 { 2231 struct sockaddr *sap1, *sap2; 2232 2233 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2234 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2235 2236 if (sap1->sa_family != sap2->sa_family) 2237 return 0; 2238 2239 switch (sap1->sa_family) { 2240 case AF_INET: { 2241 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2242 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2243 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2244 return 0; 2245 if (sin1->sin_port != sin2->sin_port) 2246 return 0; 2247 break; 2248 } 2249 case AF_INET6: { 2250 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2251 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2252 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2253 return 0; 2254 if (sin1->sin6_port != sin2->sin6_port) 2255 return 0; 2256 break; 2257 } 2258 default: 2259 return 0; 2260 } 2261 2262 return 1; 2263 } 2264 2265 static int nfs_compare_super(struct super_block *sb, void *data) 2266 { 2267 struct nfs_sb_mountdata *sb_mntdata = data; 2268 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2269 int mntflags = sb_mntdata->mntflags; 2270 2271 if (!nfs_compare_super_address(old, server)) 2272 return 0; 2273 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2274 if (old->flags & NFS_MOUNT_UNSHARED) 2275 return 0; 2276 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2277 return 0; 2278 return nfs_compare_mount_options(sb, server, mntflags); 2279 } 2280 2281 static int nfs_bdi_register(struct nfs_server *server) 2282 { 2283 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2284 } 2285 2286 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2287 int flags, const char *dev_name, void *raw_data) 2288 { 2289 struct nfs_server *server = NULL; 2290 struct super_block *s; 2291 struct nfs_parsed_mount_data *data; 2292 struct nfs_fh *mntfh; 2293 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2294 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2295 struct nfs_sb_mountdata sb_mntdata = { 2296 .mntflags = flags, 2297 }; 2298 int error; 2299 2300 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); 2301 mntfh = nfs_alloc_fhandle(); 2302 if (data == NULL || mntfh == NULL) 2303 goto out; 2304 2305 /* Validate the mount data */ 2306 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2307 if (error < 0) { 2308 mntroot = ERR_PTR(error); 2309 goto out; 2310 } 2311 2312 #ifdef CONFIG_NFS_V4 2313 if (data->version == 4) { 2314 mntroot = nfs4_try_mount(flags, dev_name, data); 2315 goto out; 2316 } 2317 #endif /* CONFIG_NFS_V4 */ 2318 2319 /* Get a volume representation */ 2320 server = nfs_create_server(data, mntfh); 2321 if (IS_ERR(server)) { 2322 mntroot = ERR_CAST(server); 2323 goto out; 2324 } 2325 sb_mntdata.server = server; 2326 2327 if (server->flags & NFS_MOUNT_UNSHARED) 2328 compare_super = NULL; 2329 2330 /* -o noac implies -o sync */ 2331 if (server->flags & NFS_MOUNT_NOAC) 2332 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2333 2334 /* Get a superblock - note that we may end up sharing one that already exists */ 2335 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2336 if (IS_ERR(s)) { 2337 mntroot = ERR_CAST(s); 2338 goto out_err_nosb; 2339 } 2340 2341 if (s->s_fs_info != server) { 2342 nfs_free_server(server); 2343 server = NULL; 2344 } else { 2345 error = nfs_bdi_register(server); 2346 if (error) { 2347 mntroot = ERR_PTR(error); 2348 goto error_splat_bdi; 2349 } 2350 } 2351 2352 if (!s->s_root) { 2353 /* initial superblock/root creation */ 2354 nfs_fill_super(s, data); 2355 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL); 2356 } 2357 2358 mntroot = nfs_get_root(s, mntfh, dev_name); 2359 if (IS_ERR(mntroot)) 2360 goto error_splat_super; 2361 2362 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2363 if (error) 2364 goto error_splat_root; 2365 2366 s->s_flags |= MS_ACTIVE; 2367 2368 out: 2369 nfs_free_parsed_mount_data(data); 2370 nfs_free_fhandle(mntfh); 2371 return mntroot; 2372 2373 out_err_nosb: 2374 nfs_free_server(server); 2375 goto out; 2376 2377 error_splat_root: 2378 dput(mntroot); 2379 mntroot = ERR_PTR(error); 2380 error_splat_super: 2381 if (server && !s->s_root) 2382 bdi_unregister(&server->backing_dev_info); 2383 error_splat_bdi: 2384 deactivate_locked_super(s); 2385 goto out; 2386 } 2387 2388 /* 2389 * Ensure that we unregister the bdi before kill_anon_super 2390 * releases the device name 2391 */ 2392 static void nfs_put_super(struct super_block *s) 2393 { 2394 struct nfs_server *server = NFS_SB(s); 2395 2396 bdi_unregister(&server->backing_dev_info); 2397 } 2398 2399 /* 2400 * Destroy an NFS2/3 superblock 2401 */ 2402 static void nfs_kill_super(struct super_block *s) 2403 { 2404 struct nfs_server *server = NFS_SB(s); 2405 2406 kill_anon_super(s); 2407 nfs_fscache_release_super_cookie(s); 2408 nfs_free_server(server); 2409 } 2410 2411 /* 2412 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2413 */ 2414 static struct dentry * 2415 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2416 const char *dev_name, void *raw_data) 2417 { 2418 struct nfs_clone_mount *data = raw_data; 2419 struct super_block *s; 2420 struct nfs_server *server; 2421 struct dentry *mntroot; 2422 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2423 struct nfs_sb_mountdata sb_mntdata = { 2424 .mntflags = flags, 2425 }; 2426 int error; 2427 2428 dprintk("--> nfs_xdev_mount()\n"); 2429 2430 /* create a new volume representation */ 2431 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2432 if (IS_ERR(server)) { 2433 error = PTR_ERR(server); 2434 goto out_err_noserver; 2435 } 2436 sb_mntdata.server = server; 2437 2438 if (server->flags & NFS_MOUNT_UNSHARED) 2439 compare_super = NULL; 2440 2441 /* -o noac implies -o sync */ 2442 if (server->flags & NFS_MOUNT_NOAC) 2443 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2444 2445 /* Get a superblock - note that we may end up sharing one that already exists */ 2446 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2447 if (IS_ERR(s)) { 2448 error = PTR_ERR(s); 2449 goto out_err_nosb; 2450 } 2451 2452 if (s->s_fs_info != server) { 2453 nfs_free_server(server); 2454 server = NULL; 2455 } else { 2456 error = nfs_bdi_register(server); 2457 if (error) 2458 goto error_splat_bdi; 2459 } 2460 2461 if (!s->s_root) { 2462 /* initial superblock/root creation */ 2463 nfs_clone_super(s, data->sb); 2464 nfs_fscache_get_super_cookie(s, NULL, data); 2465 } 2466 2467 mntroot = nfs_get_root(s, data->fh, dev_name); 2468 if (IS_ERR(mntroot)) { 2469 error = PTR_ERR(mntroot); 2470 goto error_splat_super; 2471 } 2472 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2473 dput(mntroot); 2474 error = -ESTALE; 2475 goto error_splat_super; 2476 } 2477 2478 s->s_flags |= MS_ACTIVE; 2479 2480 /* clone any lsm security options from the parent to the new sb */ 2481 security_sb_clone_mnt_opts(data->sb, s); 2482 2483 dprintk("<-- nfs_xdev_mount() = 0\n"); 2484 return mntroot; 2485 2486 out_err_nosb: 2487 nfs_free_server(server); 2488 out_err_noserver: 2489 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2490 return ERR_PTR(error); 2491 2492 error_splat_super: 2493 if (server && !s->s_root) 2494 bdi_unregister(&server->backing_dev_info); 2495 error_splat_bdi: 2496 deactivate_locked_super(s); 2497 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2498 return ERR_PTR(error); 2499 } 2500 2501 #ifdef CONFIG_NFS_V4 2502 2503 /* 2504 * Finish setting up a cloned NFS4 superblock 2505 */ 2506 static void nfs4_clone_super(struct super_block *sb, 2507 const struct super_block *old_sb) 2508 { 2509 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2510 sb->s_blocksize = old_sb->s_blocksize; 2511 sb->s_maxbytes = old_sb->s_maxbytes; 2512 sb->s_time_gran = 1; 2513 sb->s_op = old_sb->s_op; 2514 /* 2515 * The VFS shouldn't apply the umask to mode bits. We will do 2516 * so ourselves when necessary. 2517 */ 2518 sb->s_flags |= MS_POSIXACL; 2519 sb->s_xattr = old_sb->s_xattr; 2520 nfs_initialise_sb(sb); 2521 } 2522 2523 /* 2524 * Set up an NFS4 superblock 2525 */ 2526 static void nfs4_fill_super(struct super_block *sb) 2527 { 2528 sb->s_time_gran = 1; 2529 sb->s_op = &nfs4_sops; 2530 /* 2531 * The VFS shouldn't apply the umask to mode bits. We will do 2532 * so ourselves when necessary. 2533 */ 2534 sb->s_flags |= MS_POSIXACL; 2535 sb->s_xattr = nfs4_xattr_handlers; 2536 nfs_initialise_sb(sb); 2537 } 2538 2539 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2540 { 2541 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2542 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2543 } 2544 2545 static int nfs4_validate_text_mount_data(void *options, 2546 struct nfs_parsed_mount_data *args, 2547 const char *dev_name) 2548 { 2549 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2550 2551 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2552 2553 nfs_validate_transport_protocol(args); 2554 2555 nfs4_validate_mount_flags(args); 2556 2557 if (args->version != 4) { 2558 dfprintk(MOUNT, 2559 "NFS4: Illegal mount version\n"); 2560 return -EINVAL; 2561 } 2562 2563 if (args->auth_flavor_len > 1) { 2564 dfprintk(MOUNT, 2565 "NFS4: Too many RPC auth flavours specified\n"); 2566 return -EINVAL; 2567 } 2568 2569 return nfs_parse_devname(dev_name, 2570 &args->nfs_server.hostname, 2571 NFS4_MAXNAMLEN, 2572 &args->nfs_server.export_path, 2573 NFS4_MAXPATHLEN); 2574 } 2575 2576 /* 2577 * Validate NFSv4 mount options 2578 */ 2579 static int nfs4_validate_mount_data(void *options, 2580 struct nfs_parsed_mount_data *args, 2581 const char *dev_name) 2582 { 2583 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2584 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2585 char *c; 2586 2587 if (data == NULL) 2588 goto out_no_data; 2589 2590 switch (data->version) { 2591 case 1: 2592 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2593 goto out_no_address; 2594 if (data->host_addrlen == 0) 2595 goto out_no_address; 2596 args->nfs_server.addrlen = data->host_addrlen; 2597 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2598 return -EFAULT; 2599 if (!nfs_verify_server_address(sap)) 2600 goto out_no_address; 2601 2602 if (data->auth_flavourlen) { 2603 if (data->auth_flavourlen > 1) 2604 goto out_inval_auth; 2605 if (copy_from_user(&args->auth_flavors[0], 2606 data->auth_flavours, 2607 sizeof(args->auth_flavors[0]))) 2608 return -EFAULT; 2609 } 2610 2611 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2612 if (IS_ERR(c)) 2613 return PTR_ERR(c); 2614 args->nfs_server.hostname = c; 2615 2616 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2617 if (IS_ERR(c)) 2618 return PTR_ERR(c); 2619 args->nfs_server.export_path = c; 2620 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2621 2622 c = strndup_user(data->client_addr.data, 16); 2623 if (IS_ERR(c)) 2624 return PTR_ERR(c); 2625 args->client_address = c; 2626 2627 /* 2628 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2629 * can deal with. 2630 */ 2631 2632 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2633 args->rsize = data->rsize; 2634 args->wsize = data->wsize; 2635 args->timeo = data->timeo; 2636 args->retrans = data->retrans; 2637 args->acregmin = data->acregmin; 2638 args->acregmax = data->acregmax; 2639 args->acdirmin = data->acdirmin; 2640 args->acdirmax = data->acdirmax; 2641 args->nfs_server.protocol = data->proto; 2642 nfs_validate_transport_protocol(args); 2643 2644 break; 2645 default: 2646 if (nfs_parse_mount_options((char *)options, args) == 0) 2647 return -EINVAL; 2648 2649 if (!nfs_verify_server_address(sap)) 2650 return -EINVAL; 2651 2652 return nfs4_validate_text_mount_data(options, args, dev_name); 2653 } 2654 2655 return 0; 2656 2657 out_no_data: 2658 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2659 return -EINVAL; 2660 2661 out_inval_auth: 2662 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2663 data->auth_flavourlen); 2664 return -EINVAL; 2665 2666 out_no_address: 2667 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2668 return -EINVAL; 2669 } 2670 2671 /* 2672 * Get the superblock for the NFS4 root partition 2673 */ 2674 static struct dentry * 2675 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2676 const char *dev_name, void *raw_data) 2677 { 2678 struct nfs_parsed_mount_data *data = raw_data; 2679 struct super_block *s; 2680 struct nfs_server *server; 2681 struct nfs_fh *mntfh; 2682 struct dentry *mntroot; 2683 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2684 struct nfs_sb_mountdata sb_mntdata = { 2685 .mntflags = flags, 2686 }; 2687 int error = -ENOMEM; 2688 2689 mntfh = nfs_alloc_fhandle(); 2690 if (data == NULL || mntfh == NULL) 2691 goto out; 2692 2693 /* Get a volume representation */ 2694 server = nfs4_create_server(data, mntfh); 2695 if (IS_ERR(server)) { 2696 error = PTR_ERR(server); 2697 goto out; 2698 } 2699 sb_mntdata.server = server; 2700 2701 if (server->flags & NFS4_MOUNT_UNSHARED) 2702 compare_super = NULL; 2703 2704 /* -o noac implies -o sync */ 2705 if (server->flags & NFS_MOUNT_NOAC) 2706 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2707 2708 /* Get a superblock - note that we may end up sharing one that already exists */ 2709 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2710 if (IS_ERR(s)) { 2711 error = PTR_ERR(s); 2712 goto out_free; 2713 } 2714 2715 if (s->s_fs_info != server) { 2716 nfs_free_server(server); 2717 server = NULL; 2718 } else { 2719 error = nfs_bdi_register(server); 2720 if (error) 2721 goto error_splat_bdi; 2722 } 2723 2724 if (!s->s_root) { 2725 /* initial superblock/root creation */ 2726 nfs4_fill_super(s); 2727 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL); 2728 } 2729 2730 mntroot = nfs4_get_root(s, mntfh, dev_name); 2731 if (IS_ERR(mntroot)) { 2732 error = PTR_ERR(mntroot); 2733 goto error_splat_super; 2734 } 2735 2736 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2737 if (error) 2738 goto error_splat_root; 2739 2740 s->s_flags |= MS_ACTIVE; 2741 2742 nfs_free_fhandle(mntfh); 2743 return mntroot; 2744 2745 out: 2746 nfs_free_fhandle(mntfh); 2747 return ERR_PTR(error); 2748 2749 out_free: 2750 nfs_free_server(server); 2751 goto out; 2752 2753 error_splat_root: 2754 dput(mntroot); 2755 error_splat_super: 2756 if (server && !s->s_root) 2757 bdi_unregister(&server->backing_dev_info); 2758 error_splat_bdi: 2759 deactivate_locked_super(s); 2760 goto out; 2761 } 2762 2763 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2764 int flags, void *data, const char *hostname) 2765 { 2766 struct vfsmount *root_mnt; 2767 char *root_devname; 2768 size_t len; 2769 2770 len = strlen(hostname) + 5; 2771 root_devname = kmalloc(len, GFP_KERNEL); 2772 if (root_devname == NULL) 2773 return ERR_PTR(-ENOMEM); 2774 /* Does hostname needs to be enclosed in brackets? */ 2775 if (strchr(hostname, ':')) 2776 snprintf(root_devname, len, "[%s]:/", hostname); 2777 else 2778 snprintf(root_devname, len, "%s:/", hostname); 2779 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2780 kfree(root_devname); 2781 return root_mnt; 2782 } 2783 2784 struct nfs_referral_count { 2785 struct list_head list; 2786 const struct task_struct *task; 2787 unsigned int referral_count; 2788 }; 2789 2790 static LIST_HEAD(nfs_referral_count_list); 2791 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2792 2793 static struct nfs_referral_count *nfs_find_referral_count(void) 2794 { 2795 struct nfs_referral_count *p; 2796 2797 list_for_each_entry(p, &nfs_referral_count_list, list) { 2798 if (p->task == current) 2799 return p; 2800 } 2801 return NULL; 2802 } 2803 2804 #define NFS_MAX_NESTED_REFERRALS 2 2805 2806 static int nfs_referral_loop_protect(void) 2807 { 2808 struct nfs_referral_count *p, *new; 2809 int ret = -ENOMEM; 2810 2811 new = kmalloc(sizeof(*new), GFP_KERNEL); 2812 if (!new) 2813 goto out; 2814 new->task = current; 2815 new->referral_count = 1; 2816 2817 ret = 0; 2818 spin_lock(&nfs_referral_count_list_lock); 2819 p = nfs_find_referral_count(); 2820 if (p != NULL) { 2821 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2822 ret = -ELOOP; 2823 else 2824 p->referral_count++; 2825 } else { 2826 list_add(&new->list, &nfs_referral_count_list); 2827 new = NULL; 2828 } 2829 spin_unlock(&nfs_referral_count_list_lock); 2830 kfree(new); 2831 out: 2832 return ret; 2833 } 2834 2835 static void nfs_referral_loop_unprotect(void) 2836 { 2837 struct nfs_referral_count *p; 2838 2839 spin_lock(&nfs_referral_count_list_lock); 2840 p = nfs_find_referral_count(); 2841 p->referral_count--; 2842 if (p->referral_count == 0) 2843 list_del(&p->list); 2844 else 2845 p = NULL; 2846 spin_unlock(&nfs_referral_count_list_lock); 2847 kfree(p); 2848 } 2849 2850 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, 2851 const char *export_path) 2852 { 2853 struct dentry *dentry; 2854 int err; 2855 2856 if (IS_ERR(root_mnt)) 2857 return ERR_CAST(root_mnt); 2858 2859 err = nfs_referral_loop_protect(); 2860 if (err) { 2861 mntput(root_mnt); 2862 return ERR_PTR(err); 2863 } 2864 2865 dentry = mount_subtree(root_mnt, export_path); 2866 nfs_referral_loop_unprotect(); 2867 2868 return dentry; 2869 } 2870 2871 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 2872 struct nfs_parsed_mount_data *data) 2873 { 2874 char *export_path; 2875 struct vfsmount *root_mnt; 2876 struct dentry *res; 2877 2878 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2879 2880 export_path = data->nfs_server.export_path; 2881 data->nfs_server.export_path = "/"; 2882 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2883 data->nfs_server.hostname); 2884 data->nfs_server.export_path = export_path; 2885 2886 res = nfs_follow_remote_path(root_mnt, export_path); 2887 2888 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", 2889 IS_ERR(res) ? PTR_ERR(res) : 0, 2890 IS_ERR(res) ? " [error]" : ""); 2891 return res; 2892 } 2893 2894 /* 2895 * Get the superblock for an NFS4 mountpoint 2896 */ 2897 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 2898 int flags, const char *dev_name, void *raw_data) 2899 { 2900 struct nfs_parsed_mount_data *data; 2901 int error = -ENOMEM; 2902 struct dentry *res = ERR_PTR(-ENOMEM); 2903 2904 data = nfs_alloc_parsed_mount_data(4); 2905 if (data == NULL) 2906 goto out; 2907 2908 /* Validate the mount data */ 2909 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2910 if (error < 0) { 2911 res = ERR_PTR(error); 2912 goto out; 2913 } 2914 2915 res = nfs4_try_mount(flags, dev_name, data); 2916 if (IS_ERR(res)) 2917 error = PTR_ERR(res); 2918 2919 out: 2920 nfs_free_parsed_mount_data(data); 2921 dprintk("<-- nfs4_mount() = %d%s\n", error, 2922 error != 0 ? " [error]" : ""); 2923 return res; 2924 } 2925 2926 static void nfs4_kill_super(struct super_block *sb) 2927 { 2928 struct nfs_server *server = NFS_SB(sb); 2929 2930 dprintk("--> %s\n", __func__); 2931 nfs_super_return_all_delegations(sb); 2932 kill_anon_super(sb); 2933 nfs_fscache_release_super_cookie(sb); 2934 nfs_free_server(server); 2935 dprintk("<-- %s\n", __func__); 2936 } 2937 2938 /* 2939 * Clone an NFS4 server record on xdev traversal (FSID-change) 2940 */ 2941 static struct dentry * 2942 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2943 const char *dev_name, void *raw_data) 2944 { 2945 struct nfs_clone_mount *data = raw_data; 2946 struct super_block *s; 2947 struct nfs_server *server; 2948 struct dentry *mntroot; 2949 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2950 struct nfs_sb_mountdata sb_mntdata = { 2951 .mntflags = flags, 2952 }; 2953 int error; 2954 2955 dprintk("--> nfs4_xdev_mount()\n"); 2956 2957 /* create a new volume representation */ 2958 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2959 if (IS_ERR(server)) { 2960 error = PTR_ERR(server); 2961 goto out_err_noserver; 2962 } 2963 sb_mntdata.server = server; 2964 2965 if (server->flags & NFS4_MOUNT_UNSHARED) 2966 compare_super = NULL; 2967 2968 /* -o noac implies -o sync */ 2969 if (server->flags & NFS_MOUNT_NOAC) 2970 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2971 2972 /* Get a superblock - note that we may end up sharing one that already exists */ 2973 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2974 if (IS_ERR(s)) { 2975 error = PTR_ERR(s); 2976 goto out_err_nosb; 2977 } 2978 2979 if (s->s_fs_info != server) { 2980 nfs_free_server(server); 2981 server = NULL; 2982 } else { 2983 error = nfs_bdi_register(server); 2984 if (error) 2985 goto error_splat_bdi; 2986 } 2987 2988 if (!s->s_root) { 2989 /* initial superblock/root creation */ 2990 nfs4_clone_super(s, data->sb); 2991 nfs_fscache_get_super_cookie(s, NULL, data); 2992 } 2993 2994 mntroot = nfs4_get_root(s, data->fh, dev_name); 2995 if (IS_ERR(mntroot)) { 2996 error = PTR_ERR(mntroot); 2997 goto error_splat_super; 2998 } 2999 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3000 dput(mntroot); 3001 error = -ESTALE; 3002 goto error_splat_super; 3003 } 3004 3005 s->s_flags |= MS_ACTIVE; 3006 3007 security_sb_clone_mnt_opts(data->sb, s); 3008 3009 dprintk("<-- nfs4_xdev_mount() = 0\n"); 3010 return mntroot; 3011 3012 out_err_nosb: 3013 nfs_free_server(server); 3014 out_err_noserver: 3015 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 3016 return ERR_PTR(error); 3017 3018 error_splat_super: 3019 if (server && !s->s_root) 3020 bdi_unregister(&server->backing_dev_info); 3021 error_splat_bdi: 3022 deactivate_locked_super(s); 3023 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 3024 return ERR_PTR(error); 3025 } 3026 3027 static struct dentry * 3028 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 3029 const char *dev_name, void *raw_data) 3030 { 3031 struct nfs_clone_mount *data = raw_data; 3032 struct super_block *s; 3033 struct nfs_server *server; 3034 struct dentry *mntroot; 3035 struct nfs_fh *mntfh; 3036 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 3037 struct nfs_sb_mountdata sb_mntdata = { 3038 .mntflags = flags, 3039 }; 3040 int error = -ENOMEM; 3041 3042 dprintk("--> nfs4_referral_get_sb()\n"); 3043 3044 mntfh = nfs_alloc_fhandle(); 3045 if (mntfh == NULL) 3046 goto out_err_nofh; 3047 3048 /* create a new volume representation */ 3049 server = nfs4_create_referral_server(data, mntfh); 3050 if (IS_ERR(server)) { 3051 error = PTR_ERR(server); 3052 goto out_err_noserver; 3053 } 3054 sb_mntdata.server = server; 3055 3056 if (server->flags & NFS4_MOUNT_UNSHARED) 3057 compare_super = NULL; 3058 3059 /* -o noac implies -o sync */ 3060 if (server->flags & NFS_MOUNT_NOAC) 3061 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 3062 3063 /* Get a superblock - note that we may end up sharing one that already exists */ 3064 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3065 if (IS_ERR(s)) { 3066 error = PTR_ERR(s); 3067 goto out_err_nosb; 3068 } 3069 3070 if (s->s_fs_info != server) { 3071 nfs_free_server(server); 3072 server = NULL; 3073 } else { 3074 error = nfs_bdi_register(server); 3075 if (error) 3076 goto error_splat_bdi; 3077 } 3078 3079 if (!s->s_root) { 3080 /* initial superblock/root creation */ 3081 nfs4_fill_super(s); 3082 nfs_fscache_get_super_cookie(s, NULL, data); 3083 } 3084 3085 mntroot = nfs4_get_root(s, mntfh, dev_name); 3086 if (IS_ERR(mntroot)) { 3087 error = PTR_ERR(mntroot); 3088 goto error_splat_super; 3089 } 3090 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3091 dput(mntroot); 3092 error = -ESTALE; 3093 goto error_splat_super; 3094 } 3095 3096 s->s_flags |= MS_ACTIVE; 3097 3098 security_sb_clone_mnt_opts(data->sb, s); 3099 3100 nfs_free_fhandle(mntfh); 3101 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3102 return mntroot; 3103 3104 out_err_nosb: 3105 nfs_free_server(server); 3106 out_err_noserver: 3107 nfs_free_fhandle(mntfh); 3108 out_err_nofh: 3109 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3110 return ERR_PTR(error); 3111 3112 error_splat_super: 3113 if (server && !s->s_root) 3114 bdi_unregister(&server->backing_dev_info); 3115 error_splat_bdi: 3116 deactivate_locked_super(s); 3117 nfs_free_fhandle(mntfh); 3118 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3119 return ERR_PTR(error); 3120 } 3121 3122 /* 3123 * Create an NFS4 server record on referral traversal 3124 */ 3125 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 3126 int flags, const char *dev_name, void *raw_data) 3127 { 3128 struct nfs_clone_mount *data = raw_data; 3129 char *export_path; 3130 struct vfsmount *root_mnt; 3131 struct dentry *res; 3132 3133 dprintk("--> nfs4_referral_mount()\n"); 3134 3135 export_path = data->mnt_path; 3136 data->mnt_path = "/"; 3137 3138 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3139 flags, data, data->hostname); 3140 data->mnt_path = export_path; 3141 3142 res = nfs_follow_remote_path(root_mnt, export_path); 3143 dprintk("<-- nfs4_referral_mount() = %ld%s\n", 3144 IS_ERR(res) ? PTR_ERR(res) : 0, 3145 IS_ERR(res) ? " [error]" : ""); 3146 return res; 3147 } 3148 3149 #endif /* CONFIG_NFS_V4 */ 3150