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 #define NFS_TEXT_DATA 1 70 71 #ifdef CONFIG_NFS_V3 72 #define NFS_DEFAULT_VERSION 3 73 #else 74 #define NFS_DEFAULT_VERSION 2 75 #endif 76 77 enum { 78 /* Mount options that take no arguments */ 79 Opt_soft, Opt_hard, 80 Opt_posix, Opt_noposix, 81 Opt_cto, Opt_nocto, 82 Opt_ac, Opt_noac, 83 Opt_lock, Opt_nolock, 84 Opt_udp, Opt_tcp, Opt_rdma, 85 Opt_acl, Opt_noacl, 86 Opt_rdirplus, Opt_nordirplus, 87 Opt_sharecache, Opt_nosharecache, 88 Opt_resvport, Opt_noresvport, 89 Opt_fscache, Opt_nofscache, 90 91 /* Mount options that take integer arguments */ 92 Opt_port, 93 Opt_rsize, Opt_wsize, Opt_bsize, 94 Opt_timeo, Opt_retrans, 95 Opt_acregmin, Opt_acregmax, 96 Opt_acdirmin, Opt_acdirmax, 97 Opt_actimeo, 98 Opt_namelen, 99 Opt_mountport, 100 Opt_mountvers, 101 Opt_minorversion, 102 103 /* Mount options that take string arguments */ 104 Opt_nfsvers, 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 106 Opt_addr, Opt_mountaddr, Opt_clientaddr, 107 Opt_lookupcache, 108 Opt_fscache_uniq, 109 Opt_local_lock, 110 111 /* Special mount options */ 112 Opt_userspace, Opt_deprecated, Opt_sloppy, 113 114 Opt_err 115 }; 116 117 static const match_table_t nfs_mount_option_tokens = { 118 { Opt_userspace, "bg" }, 119 { Opt_userspace, "fg" }, 120 { Opt_userspace, "retry=%s" }, 121 122 { Opt_sloppy, "sloppy" }, 123 124 { Opt_soft, "soft" }, 125 { Opt_hard, "hard" }, 126 { Opt_deprecated, "intr" }, 127 { Opt_deprecated, "nointr" }, 128 { Opt_posix, "posix" }, 129 { Opt_noposix, "noposix" }, 130 { Opt_cto, "cto" }, 131 { Opt_nocto, "nocto" }, 132 { Opt_ac, "ac" }, 133 { Opt_noac, "noac" }, 134 { Opt_lock, "lock" }, 135 { Opt_nolock, "nolock" }, 136 { Opt_udp, "udp" }, 137 { Opt_tcp, "tcp" }, 138 { Opt_rdma, "rdma" }, 139 { Opt_acl, "acl" }, 140 { Opt_noacl, "noacl" }, 141 { Opt_rdirplus, "rdirplus" }, 142 { Opt_nordirplus, "nordirplus" }, 143 { Opt_sharecache, "sharecache" }, 144 { Opt_nosharecache, "nosharecache" }, 145 { Opt_resvport, "resvport" }, 146 { Opt_noresvport, "noresvport" }, 147 { Opt_fscache, "fsc" }, 148 { Opt_nofscache, "nofsc" }, 149 150 { Opt_port, "port=%s" }, 151 { Opt_rsize, "rsize=%s" }, 152 { Opt_wsize, "wsize=%s" }, 153 { Opt_bsize, "bsize=%s" }, 154 { Opt_timeo, "timeo=%s" }, 155 { Opt_retrans, "retrans=%s" }, 156 { Opt_acregmin, "acregmin=%s" }, 157 { Opt_acregmax, "acregmax=%s" }, 158 { Opt_acdirmin, "acdirmin=%s" }, 159 { Opt_acdirmax, "acdirmax=%s" }, 160 { Opt_actimeo, "actimeo=%s" }, 161 { Opt_namelen, "namlen=%s" }, 162 { Opt_mountport, "mountport=%s" }, 163 { Opt_mountvers, "mountvers=%s" }, 164 { Opt_minorversion, "minorversion=%s" }, 165 166 { Opt_nfsvers, "nfsvers=%s" }, 167 { Opt_nfsvers, "vers=%s" }, 168 169 { Opt_sec, "sec=%s" }, 170 { Opt_proto, "proto=%s" }, 171 { Opt_mountproto, "mountproto=%s" }, 172 { Opt_addr, "addr=%s" }, 173 { Opt_clientaddr, "clientaddr=%s" }, 174 { Opt_mounthost, "mounthost=%s" }, 175 { Opt_mountaddr, "mountaddr=%s" }, 176 177 { Opt_lookupcache, "lookupcache=%s" }, 178 { Opt_fscache_uniq, "fsc=%s" }, 179 { Opt_local_lock, "local_lock=%s" }, 180 181 /* The following needs to be listed after all other options */ 182 { Opt_nfsvers, "v%s" }, 183 184 { Opt_err, NULL } 185 }; 186 187 enum { 188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 189 190 Opt_xprt_err 191 }; 192 193 static const match_table_t nfs_xprt_protocol_tokens = { 194 { Opt_xprt_udp, "udp" }, 195 { Opt_xprt_udp6, "udp6" }, 196 { Opt_xprt_tcp, "tcp" }, 197 { Opt_xprt_tcp6, "tcp6" }, 198 { Opt_xprt_rdma, "rdma" }, 199 200 { Opt_xprt_err, NULL } 201 }; 202 203 enum { 204 Opt_sec_none, Opt_sec_sys, 205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 208 209 Opt_sec_err 210 }; 211 212 static const match_table_t nfs_secflavor_tokens = { 213 { Opt_sec_none, "none" }, 214 { Opt_sec_none, "null" }, 215 { Opt_sec_sys, "sys" }, 216 217 { Opt_sec_krb5, "krb5" }, 218 { Opt_sec_krb5i, "krb5i" }, 219 { Opt_sec_krb5p, "krb5p" }, 220 221 { Opt_sec_lkey, "lkey" }, 222 { Opt_sec_lkeyi, "lkeyi" }, 223 { Opt_sec_lkeyp, "lkeyp" }, 224 225 { Opt_sec_spkm, "spkm3" }, 226 { Opt_sec_spkmi, "spkm3i" }, 227 { Opt_sec_spkmp, "spkm3p" }, 228 229 { Opt_sec_err, NULL } 230 }; 231 232 enum { 233 Opt_lookupcache_all, Opt_lookupcache_positive, 234 Opt_lookupcache_none, 235 236 Opt_lookupcache_err 237 }; 238 239 static match_table_t nfs_lookupcache_tokens = { 240 { Opt_lookupcache_all, "all" }, 241 { Opt_lookupcache_positive, "pos" }, 242 { Opt_lookupcache_positive, "positive" }, 243 { Opt_lookupcache_none, "none" }, 244 245 { Opt_lookupcache_err, NULL } 246 }; 247 248 enum { 249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 250 Opt_local_lock_none, 251 252 Opt_local_lock_err 253 }; 254 255 static match_table_t nfs_local_lock_tokens = { 256 { Opt_local_lock_all, "all" }, 257 { Opt_local_lock_flock, "flock" }, 258 { Opt_local_lock_posix, "posix" }, 259 { Opt_local_lock_none, "none" }, 260 261 { Opt_local_lock_err, NULL } 262 }; 263 264 enum { 265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 266 Opt_vers_4_1, 267 268 Opt_vers_err 269 }; 270 271 static match_table_t nfs_vers_tokens = { 272 { Opt_vers_2, "2" }, 273 { Opt_vers_3, "3" }, 274 { Opt_vers_4, "4" }, 275 { Opt_vers_4_0, "4.0" }, 276 { Opt_vers_4_1, "4.1" }, 277 278 { Opt_vers_err, NULL } 279 }; 280 281 struct nfs_mount_info { 282 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 284 struct nfs_parsed_mount_data *parsed; 285 struct nfs_clone_mount *cloned; 286 struct nfs_fh *mntfh; 287 }; 288 289 static void nfs_umount_begin(struct super_block *); 290 static int nfs_statfs(struct dentry *, struct kstatfs *); 291 static int nfs_show_options(struct seq_file *, struct dentry *); 292 static int nfs_show_devname(struct seq_file *, struct dentry *); 293 static int nfs_show_path(struct seq_file *, struct dentry *); 294 static int nfs_show_stats(struct seq_file *, struct dentry *); 295 static struct dentry *nfs_fs_mount_common(struct file_system_type *, 296 struct nfs_server *, int, const char *, struct nfs_mount_info *); 297 static struct dentry *nfs_fs_mount(struct file_system_type *, 298 int, const char *, void *); 299 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 300 int flags, const char *dev_name, void *raw_data); 301 static void nfs_put_super(struct super_block *); 302 static void nfs_kill_super(struct super_block *); 303 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 304 305 static struct file_system_type nfs_fs_type = { 306 .owner = THIS_MODULE, 307 .name = "nfs", 308 .mount = nfs_fs_mount, 309 .kill_sb = nfs_kill_super, 310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 311 }; 312 313 struct file_system_type nfs_xdev_fs_type = { 314 .owner = THIS_MODULE, 315 .name = "nfs", 316 .mount = nfs_xdev_mount, 317 .kill_sb = nfs_kill_super, 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 319 }; 320 321 static const struct super_operations nfs_sops = { 322 .alloc_inode = nfs_alloc_inode, 323 .destroy_inode = nfs_destroy_inode, 324 .write_inode = nfs_write_inode, 325 .put_super = nfs_put_super, 326 .statfs = nfs_statfs, 327 .evict_inode = nfs_evict_inode, 328 .umount_begin = nfs_umount_begin, 329 .show_options = nfs_show_options, 330 .show_devname = nfs_show_devname, 331 .show_path = nfs_show_path, 332 .show_stats = nfs_show_stats, 333 .remount_fs = nfs_remount, 334 }; 335 336 #ifdef CONFIG_NFS_V4 337 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 338 static int nfs4_validate_mount_data(void *options, 339 struct nfs_parsed_mount_data *args, const char *dev_name); 340 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 341 struct nfs_mount_info *mount_info); 342 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 343 int flags, const char *dev_name, void *raw_data); 344 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 345 int flags, const char *dev_name, void *raw_data); 346 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 347 int flags, const char *dev_name, void *raw_data); 348 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 349 int flags, const char *dev_name, void *raw_data); 350 static void nfs4_kill_super(struct super_block *sb); 351 352 static struct file_system_type nfs4_fs_type = { 353 .owner = THIS_MODULE, 354 .name = "nfs4", 355 .mount = nfs_fs_mount, 356 .kill_sb = nfs4_kill_super, 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 358 }; 359 360 static struct file_system_type nfs4_remote_fs_type = { 361 .owner = THIS_MODULE, 362 .name = "nfs4", 363 .mount = nfs4_remote_mount, 364 .kill_sb = nfs4_kill_super, 365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 366 }; 367 368 struct file_system_type nfs4_xdev_fs_type = { 369 .owner = THIS_MODULE, 370 .name = "nfs4", 371 .mount = nfs4_xdev_mount, 372 .kill_sb = nfs4_kill_super, 373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 374 }; 375 376 static struct file_system_type nfs4_remote_referral_fs_type = { 377 .owner = THIS_MODULE, 378 .name = "nfs4", 379 .mount = nfs4_remote_referral_mount, 380 .kill_sb = nfs4_kill_super, 381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 382 }; 383 384 struct file_system_type nfs4_referral_fs_type = { 385 .owner = THIS_MODULE, 386 .name = "nfs4", 387 .mount = nfs4_referral_mount, 388 .kill_sb = nfs4_kill_super, 389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 390 }; 391 392 static const struct super_operations nfs4_sops = { 393 .alloc_inode = nfs_alloc_inode, 394 .destroy_inode = nfs_destroy_inode, 395 .write_inode = nfs_write_inode, 396 .put_super = nfs_put_super, 397 .statfs = nfs_statfs, 398 .evict_inode = nfs4_evict_inode, 399 .umount_begin = nfs_umount_begin, 400 .show_options = nfs_show_options, 401 .show_devname = nfs_show_devname, 402 .show_path = nfs_show_path, 403 .show_stats = nfs_show_stats, 404 .remount_fs = nfs_remount, 405 }; 406 #endif 407 408 static struct shrinker acl_shrinker = { 409 .shrink = nfs_access_cache_shrinker, 410 .seeks = DEFAULT_SEEKS, 411 }; 412 413 /* 414 * Register the NFS filesystems 415 */ 416 int __init register_nfs_fs(void) 417 { 418 int ret; 419 420 ret = register_filesystem(&nfs_fs_type); 421 if (ret < 0) 422 goto error_0; 423 424 ret = nfs_register_sysctl(); 425 if (ret < 0) 426 goto error_1; 427 #ifdef CONFIG_NFS_V4 428 ret = register_filesystem(&nfs4_fs_type); 429 if (ret < 0) 430 goto error_2; 431 #endif 432 register_shrinker(&acl_shrinker); 433 return 0; 434 435 #ifdef CONFIG_NFS_V4 436 error_2: 437 nfs_unregister_sysctl(); 438 #endif 439 error_1: 440 unregister_filesystem(&nfs_fs_type); 441 error_0: 442 return ret; 443 } 444 445 /* 446 * Unregister the NFS filesystems 447 */ 448 void __exit unregister_nfs_fs(void) 449 { 450 unregister_shrinker(&acl_shrinker); 451 #ifdef CONFIG_NFS_V4 452 unregister_filesystem(&nfs4_fs_type); 453 #endif 454 nfs_unregister_sysctl(); 455 unregister_filesystem(&nfs_fs_type); 456 } 457 458 void nfs_sb_active(struct super_block *sb) 459 { 460 struct nfs_server *server = NFS_SB(sb); 461 462 if (atomic_inc_return(&server->active) == 1) 463 atomic_inc(&sb->s_active); 464 } 465 466 void nfs_sb_deactive(struct super_block *sb) 467 { 468 struct nfs_server *server = NFS_SB(sb); 469 470 if (atomic_dec_and_test(&server->active)) 471 deactivate_super(sb); 472 } 473 474 /* 475 * Deliver file system statistics to userspace 476 */ 477 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 478 { 479 struct nfs_server *server = NFS_SB(dentry->d_sb); 480 unsigned char blockbits; 481 unsigned long blockres; 482 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 483 struct nfs_fsstat res; 484 int error = -ENOMEM; 485 486 res.fattr = nfs_alloc_fattr(); 487 if (res.fattr == NULL) 488 goto out_err; 489 490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 491 if (unlikely(error == -ESTALE)) { 492 struct dentry *pd_dentry; 493 494 pd_dentry = dget_parent(dentry); 495 if (pd_dentry != NULL) { 496 nfs_zap_caches(pd_dentry->d_inode); 497 dput(pd_dentry); 498 } 499 } 500 nfs_free_fattr(res.fattr); 501 if (error < 0) 502 goto out_err; 503 504 buf->f_type = NFS_SUPER_MAGIC; 505 506 /* 507 * Current versions of glibc do not correctly handle the 508 * case where f_frsize != f_bsize. Eventually we want to 509 * report the value of wtmult in this field. 510 */ 511 buf->f_frsize = dentry->d_sb->s_blocksize; 512 513 /* 514 * On most *nix systems, f_blocks, f_bfree, and f_bavail 515 * are reported in units of f_frsize. Linux hasn't had 516 * an f_frsize field in its statfs struct until recently, 517 * thus historically Linux's sys_statfs reports these 518 * fields in units of f_bsize. 519 */ 520 buf->f_bsize = dentry->d_sb->s_blocksize; 521 blockbits = dentry->d_sb->s_blocksize_bits; 522 blockres = (1 << blockbits) - 1; 523 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 524 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 525 buf->f_bavail = (res.abytes + blockres) >> blockbits; 526 527 buf->f_files = res.tfiles; 528 buf->f_ffree = res.afiles; 529 530 buf->f_namelen = server->namelen; 531 532 return 0; 533 534 out_err: 535 dprintk("%s: statfs error = %d\n", __func__, -error); 536 return error; 537 } 538 539 /* 540 * Map the security flavour number to a name 541 */ 542 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 543 { 544 static const struct { 545 rpc_authflavor_t flavour; 546 const char *str; 547 } sec_flavours[] = { 548 { RPC_AUTH_NULL, "null" }, 549 { RPC_AUTH_UNIX, "sys" }, 550 { RPC_AUTH_GSS_KRB5, "krb5" }, 551 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 552 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 553 { RPC_AUTH_GSS_LKEY, "lkey" }, 554 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 555 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 556 { RPC_AUTH_GSS_SPKM, "spkm" }, 557 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 558 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 559 { UINT_MAX, "unknown" } 560 }; 561 int i; 562 563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 564 if (sec_flavours[i].flavour == flavour) 565 break; 566 } 567 return sec_flavours[i].str; 568 } 569 570 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 571 int showdefaults) 572 { 573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 574 575 seq_printf(m, ",mountproto="); 576 switch (sap->sa_family) { 577 case AF_INET: 578 switch (nfss->mountd_protocol) { 579 case IPPROTO_UDP: 580 seq_printf(m, RPCBIND_NETID_UDP); 581 break; 582 case IPPROTO_TCP: 583 seq_printf(m, RPCBIND_NETID_TCP); 584 break; 585 default: 586 if (showdefaults) 587 seq_printf(m, "auto"); 588 } 589 break; 590 case AF_INET6: 591 switch (nfss->mountd_protocol) { 592 case IPPROTO_UDP: 593 seq_printf(m, RPCBIND_NETID_UDP6); 594 break; 595 case IPPROTO_TCP: 596 seq_printf(m, RPCBIND_NETID_TCP6); 597 break; 598 default: 599 if (showdefaults) 600 seq_printf(m, "auto"); 601 } 602 break; 603 default: 604 if (showdefaults) 605 seq_printf(m, "auto"); 606 } 607 } 608 609 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 610 int showdefaults) 611 { 612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 613 614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 615 return; 616 617 switch (sap->sa_family) { 618 case AF_INET: { 619 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 621 break; 622 } 623 case AF_INET6: { 624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 626 break; 627 } 628 default: 629 if (showdefaults) 630 seq_printf(m, ",mountaddr=unspecified"); 631 } 632 633 if (nfss->mountd_version || showdefaults) 634 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 635 if ((nfss->mountd_port && 636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 637 showdefaults) 638 seq_printf(m, ",mountport=%u", nfss->mountd_port); 639 640 nfs_show_mountd_netid(m, nfss, showdefaults); 641 } 642 643 #ifdef CONFIG_NFS_V4 644 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 645 int showdefaults) 646 { 647 struct nfs_client *clp = nfss->nfs_client; 648 649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 650 } 651 #else 652 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 653 int showdefaults) 654 { 655 } 656 #endif 657 658 static void nfs_show_nfs_version(struct seq_file *m, 659 unsigned int version, 660 unsigned int minorversion) 661 { 662 seq_printf(m, ",vers=%u", version); 663 if (version == 4) 664 seq_printf(m, ".%u", minorversion); 665 } 666 667 /* 668 * Describe the mount options in force on this server representation 669 */ 670 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 671 int showdefaults) 672 { 673 static const struct proc_nfs_info { 674 int flag; 675 const char *str; 676 const char *nostr; 677 } nfs_info[] = { 678 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 679 { NFS_MOUNT_POSIX, ",posix", "" }, 680 { NFS_MOUNT_NOCTO, ",nocto", "" }, 681 { NFS_MOUNT_NOAC, ",noac", "" }, 682 { NFS_MOUNT_NONLM, ",nolock", "" }, 683 { NFS_MOUNT_NOACL, ",noacl", "" }, 684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 687 { 0, NULL, NULL } 688 }; 689 const struct proc_nfs_info *nfs_infop; 690 struct nfs_client *clp = nfss->nfs_client; 691 u32 version = clp->rpc_ops->version; 692 int local_flock, local_fcntl; 693 694 nfs_show_nfs_version(m, version, clp->cl_minorversion); 695 seq_printf(m, ",rsize=%u", nfss->rsize); 696 seq_printf(m, ",wsize=%u", nfss->wsize); 697 if (nfss->bsize != 0) 698 seq_printf(m, ",bsize=%u", nfss->bsize); 699 seq_printf(m, ",namlen=%u", nfss->namelen); 700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 709 if (nfss->flags & nfs_infop->flag) 710 seq_puts(m, nfs_infop->str); 711 else 712 seq_puts(m, nfs_infop->nostr); 713 } 714 rcu_read_lock(); 715 seq_printf(m, ",proto=%s", 716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 717 rcu_read_unlock(); 718 if (version == 4) { 719 if (nfss->port != NFS_PORT) 720 seq_printf(m, ",port=%u", nfss->port); 721 } else 722 if (nfss->port) 723 seq_printf(m, ",port=%u", nfss->port); 724 725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 728 729 if (version != 4) 730 nfs_show_mountd_options(m, nfss, showdefaults); 731 else 732 nfs_show_nfsv4_options(m, nfss, showdefaults); 733 734 if (nfss->options & NFS_OPTION_FSCACHE) 735 seq_printf(m, ",fsc"); 736 737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 739 seq_printf(m, ",lookupcache=none"); 740 else 741 seq_printf(m, ",lookupcache=pos"); 742 } 743 744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 746 747 if (!local_flock && !local_fcntl) 748 seq_printf(m, ",local_lock=none"); 749 else if (local_flock && local_fcntl) 750 seq_printf(m, ",local_lock=all"); 751 else if (local_flock) 752 seq_printf(m, ",local_lock=flock"); 753 else 754 seq_printf(m, ",local_lock=posix"); 755 } 756 757 /* 758 * Describe the mount options on this VFS mountpoint 759 */ 760 static int nfs_show_options(struct seq_file *m, struct dentry *root) 761 { 762 struct nfs_server *nfss = NFS_SB(root->d_sb); 763 764 nfs_show_mount_options(m, nfss, 0); 765 766 rcu_read_lock(); 767 seq_printf(m, ",addr=%s", 768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 769 RPC_DISPLAY_ADDR)); 770 rcu_read_unlock(); 771 772 return 0; 773 } 774 775 #ifdef CONFIG_NFS_V4 776 #ifdef CONFIG_NFS_V4_1 777 static void show_sessions(struct seq_file *m, struct nfs_server *server) 778 { 779 if (nfs4_has_session(server->nfs_client)) 780 seq_printf(m, ",sessions"); 781 } 782 #else 783 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 784 #endif 785 #endif 786 787 #ifdef CONFIG_NFS_V4_1 788 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 789 { 790 seq_printf(m, ",pnfs="); 791 if (server->pnfs_curr_ld) 792 seq_printf(m, "%s", server->pnfs_curr_ld->name); 793 else 794 seq_printf(m, "not configured"); 795 } 796 797 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 798 { 799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 802 "date='%llu,%u'", 803 impl_id->name, impl_id->domain, 804 impl_id->date.seconds, impl_id->date.nseconds); 805 } 806 } 807 #else 808 #ifdef CONFIG_NFS_V4 809 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 810 { 811 } 812 #endif 813 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 814 { 815 } 816 #endif 817 818 static int nfs_show_devname(struct seq_file *m, struct dentry *root) 819 { 820 char *page = (char *) __get_free_page(GFP_KERNEL); 821 char *devname, *dummy; 822 int err = 0; 823 if (!page) 824 return -ENOMEM; 825 devname = nfs_path(&dummy, root, page, PAGE_SIZE); 826 if (IS_ERR(devname)) 827 err = PTR_ERR(devname); 828 else 829 seq_escape(m, devname, " \t\n\\"); 830 free_page((unsigned long)page); 831 return err; 832 } 833 834 static int nfs_show_path(struct seq_file *m, struct dentry *dentry) 835 { 836 seq_puts(m, "/"); 837 return 0; 838 } 839 840 /* 841 * Present statistical information for this VFS mountpoint 842 */ 843 static int nfs_show_stats(struct seq_file *m, struct dentry *root) 844 { 845 int i, cpu; 846 struct nfs_server *nfss = NFS_SB(root->d_sb); 847 struct rpc_auth *auth = nfss->client->cl_auth; 848 struct nfs_iostats totals = { }; 849 850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 851 852 /* 853 * Display all mount option settings 854 */ 855 seq_printf(m, "\n\topts:\t"); 856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 860 nfs_show_mount_options(m, nfss, 1); 861 862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 863 864 show_implementation_id(m, nfss); 865 866 seq_printf(m, "\n\tcaps:\t"); 867 seq_printf(m, "caps=0x%x", nfss->caps); 868 seq_printf(m, ",wtmult=%u", nfss->wtmult); 869 seq_printf(m, ",dtsize=%u", nfss->dtsize); 870 seq_printf(m, ",bsize=%u", nfss->bsize); 871 seq_printf(m, ",namlen=%u", nfss->namelen); 872 873 #ifdef CONFIG_NFS_V4 874 if (nfss->nfs_client->rpc_ops->version == 4) { 875 seq_printf(m, "\n\tnfsv4:\t"); 876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 879 show_sessions(m, nfss); 880 show_pnfs(m, nfss); 881 } 882 #endif 883 884 /* 885 * Display security flavor in effect for this mount 886 */ 887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 888 if (auth->au_flavor) 889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 890 891 /* 892 * Display superblock I/O counters 893 */ 894 for_each_possible_cpu(cpu) { 895 struct nfs_iostats *stats; 896 897 preempt_disable(); 898 stats = per_cpu_ptr(nfss->io_stats, cpu); 899 900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 901 totals.events[i] += stats->events[i]; 902 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 903 totals.bytes[i] += stats->bytes[i]; 904 #ifdef CONFIG_NFS_FSCACHE 905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 906 totals.fscache[i] += stats->fscache[i]; 907 #endif 908 909 preempt_enable(); 910 } 911 912 seq_printf(m, "\n\tevents:\t"); 913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 914 seq_printf(m, "%lu ", totals.events[i]); 915 seq_printf(m, "\n\tbytes:\t"); 916 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 917 seq_printf(m, "%Lu ", totals.bytes[i]); 918 #ifdef CONFIG_NFS_FSCACHE 919 if (nfss->options & NFS_OPTION_FSCACHE) { 920 seq_printf(m, "\n\tfsc:\t"); 921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 922 seq_printf(m, "%Lu ", totals.bytes[i]); 923 } 924 #endif 925 seq_printf(m, "\n"); 926 927 rpc_print_iostats(m, nfss->client); 928 929 return 0; 930 } 931 932 /* 933 * Begin unmount by attempting to remove all automounted mountpoints we added 934 * in response to xdev traversals and referrals 935 */ 936 static void nfs_umount_begin(struct super_block *sb) 937 { 938 struct nfs_server *server; 939 struct rpc_clnt *rpc; 940 941 server = NFS_SB(sb); 942 /* -EIO all pending I/O */ 943 rpc = server->client_acl; 944 if (!IS_ERR(rpc)) 945 rpc_killall_tasks(rpc); 946 rpc = server->client; 947 if (!IS_ERR(rpc)) 948 rpc_killall_tasks(rpc); 949 } 950 951 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 952 { 953 struct nfs_parsed_mount_data *data; 954 955 data = kzalloc(sizeof(*data), GFP_KERNEL); 956 if (data) { 957 data->acregmin = NFS_DEF_ACREGMIN; 958 data->acregmax = NFS_DEF_ACREGMAX; 959 data->acdirmin = NFS_DEF_ACDIRMIN; 960 data->acdirmax = NFS_DEF_ACDIRMAX; 961 data->mount_server.port = NFS_UNSPEC_PORT; 962 data->nfs_server.port = NFS_UNSPEC_PORT; 963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 964 data->auth_flavors[0] = RPC_AUTH_UNIX; 965 data->auth_flavor_len = 1; 966 data->minorversion = 0; 967 data->need_mount = true; 968 data->net = current->nsproxy->net_ns; 969 security_init_mnt_opts(&data->lsm_opts); 970 } 971 return data; 972 } 973 974 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 975 { 976 if (data) { 977 kfree(data->client_address); 978 kfree(data->mount_server.hostname); 979 kfree(data->nfs_server.export_path); 980 kfree(data->nfs_server.hostname); 981 kfree(data->fscache_uniq); 982 security_free_mnt_opts(&data->lsm_opts); 983 kfree(data); 984 } 985 } 986 987 /* 988 * Sanity-check a server address provided by the mount command. 989 * 990 * Address family must be initialized, and address must not be 991 * the ANY address for that family. 992 */ 993 static int nfs_verify_server_address(struct sockaddr *addr) 994 { 995 switch (addr->sa_family) { 996 case AF_INET: { 997 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 998 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 999 } 1000 case AF_INET6: { 1001 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 1002 return !ipv6_addr_any(sa); 1003 } 1004 } 1005 1006 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 1007 return 0; 1008 } 1009 1010 /* 1011 * Select between a default port value and a user-specified port value. 1012 * If a zero value is set, then autobind will be used. 1013 */ 1014 static void nfs_set_port(struct sockaddr *sap, int *port, 1015 const unsigned short default_port) 1016 { 1017 if (*port == NFS_UNSPEC_PORT) 1018 *port = default_port; 1019 1020 rpc_set_port(sap, *port); 1021 } 1022 1023 /* 1024 * Sanity check the NFS transport protocol. 1025 * 1026 */ 1027 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 1028 { 1029 switch (mnt->nfs_server.protocol) { 1030 case XPRT_TRANSPORT_UDP: 1031 case XPRT_TRANSPORT_TCP: 1032 case XPRT_TRANSPORT_RDMA: 1033 break; 1034 default: 1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1036 } 1037 } 1038 1039 /* 1040 * For text based NFSv2/v3 mounts, the mount protocol transport default 1041 * settings should depend upon the specified NFS transport. 1042 */ 1043 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1044 { 1045 nfs_validate_transport_protocol(mnt); 1046 1047 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1048 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1049 return; 1050 switch (mnt->nfs_server.protocol) { 1051 case XPRT_TRANSPORT_UDP: 1052 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1053 break; 1054 case XPRT_TRANSPORT_TCP: 1055 case XPRT_TRANSPORT_RDMA: 1056 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1057 } 1058 } 1059 1060 /* 1061 * Parse the value of the 'sec=' option. 1062 */ 1063 static int nfs_parse_security_flavors(char *value, 1064 struct nfs_parsed_mount_data *mnt) 1065 { 1066 substring_t args[MAX_OPT_ARGS]; 1067 1068 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1069 1070 switch (match_token(value, nfs_secflavor_tokens, args)) { 1071 case Opt_sec_none: 1072 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1073 break; 1074 case Opt_sec_sys: 1075 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1076 break; 1077 case Opt_sec_krb5: 1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1079 break; 1080 case Opt_sec_krb5i: 1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1082 break; 1083 case Opt_sec_krb5p: 1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1085 break; 1086 case Opt_sec_lkey: 1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1088 break; 1089 case Opt_sec_lkeyi: 1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1091 break; 1092 case Opt_sec_lkeyp: 1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1094 break; 1095 case Opt_sec_spkm: 1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1097 break; 1098 case Opt_sec_spkmi: 1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1100 break; 1101 case Opt_sec_spkmp: 1102 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1103 break; 1104 default: 1105 return 0; 1106 } 1107 1108 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1109 mnt->auth_flavor_len = 1; 1110 return 1; 1111 } 1112 1113 static int nfs_parse_version_string(char *string, 1114 struct nfs_parsed_mount_data *mnt, 1115 substring_t *args) 1116 { 1117 mnt->flags &= ~NFS_MOUNT_VER3; 1118 switch (match_token(string, nfs_vers_tokens, args)) { 1119 case Opt_vers_2: 1120 mnt->version = 2; 1121 break; 1122 case Opt_vers_3: 1123 mnt->flags |= NFS_MOUNT_VER3; 1124 mnt->version = 3; 1125 break; 1126 case Opt_vers_4: 1127 /* Backward compatibility option. In future, 1128 * the mount program should always supply 1129 * a NFSv4 minor version number. 1130 */ 1131 mnt->version = 4; 1132 break; 1133 case Opt_vers_4_0: 1134 mnt->version = 4; 1135 mnt->minorversion = 0; 1136 break; 1137 case Opt_vers_4_1: 1138 mnt->version = 4; 1139 mnt->minorversion = 1; 1140 break; 1141 default: 1142 return 0; 1143 } 1144 return 1; 1145 } 1146 1147 static int nfs_get_option_str(substring_t args[], char **option) 1148 { 1149 kfree(*option); 1150 *option = match_strdup(args); 1151 return !option; 1152 } 1153 1154 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1155 { 1156 int rc; 1157 char *string; 1158 1159 string = match_strdup(args); 1160 if (string == NULL) 1161 return -ENOMEM; 1162 rc = strict_strtoul(string, 10, option); 1163 kfree(string); 1164 1165 return rc; 1166 } 1167 1168 /* 1169 * Error-check and convert a string of mount options from user space into 1170 * a data structure. The whole mount string is processed; bad options are 1171 * skipped as they are encountered. If there were no errors, return 1; 1172 * otherwise return 0 (zero). 1173 */ 1174 static int nfs_parse_mount_options(char *raw, 1175 struct nfs_parsed_mount_data *mnt) 1176 { 1177 char *p, *string, *secdata; 1178 int rc, sloppy = 0, invalid_option = 0; 1179 unsigned short protofamily = AF_UNSPEC; 1180 unsigned short mountfamily = AF_UNSPEC; 1181 1182 if (!raw) { 1183 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1184 return 1; 1185 } 1186 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1187 1188 secdata = alloc_secdata(); 1189 if (!secdata) 1190 goto out_nomem; 1191 1192 rc = security_sb_copy_data(raw, secdata); 1193 if (rc) 1194 goto out_security_failure; 1195 1196 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1197 if (rc) 1198 goto out_security_failure; 1199 1200 free_secdata(secdata); 1201 1202 while ((p = strsep(&raw, ",")) != NULL) { 1203 substring_t args[MAX_OPT_ARGS]; 1204 unsigned long option; 1205 int token; 1206 1207 if (!*p) 1208 continue; 1209 1210 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1211 1212 token = match_token(p, nfs_mount_option_tokens, args); 1213 switch (token) { 1214 1215 /* 1216 * boolean options: foo/nofoo 1217 */ 1218 case Opt_soft: 1219 mnt->flags |= NFS_MOUNT_SOFT; 1220 break; 1221 case Opt_hard: 1222 mnt->flags &= ~NFS_MOUNT_SOFT; 1223 break; 1224 case Opt_posix: 1225 mnt->flags |= NFS_MOUNT_POSIX; 1226 break; 1227 case Opt_noposix: 1228 mnt->flags &= ~NFS_MOUNT_POSIX; 1229 break; 1230 case Opt_cto: 1231 mnt->flags &= ~NFS_MOUNT_NOCTO; 1232 break; 1233 case Opt_nocto: 1234 mnt->flags |= NFS_MOUNT_NOCTO; 1235 break; 1236 case Opt_ac: 1237 mnt->flags &= ~NFS_MOUNT_NOAC; 1238 break; 1239 case Opt_noac: 1240 mnt->flags |= NFS_MOUNT_NOAC; 1241 break; 1242 case Opt_lock: 1243 mnt->flags &= ~NFS_MOUNT_NONLM; 1244 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1245 NFS_MOUNT_LOCAL_FCNTL); 1246 break; 1247 case Opt_nolock: 1248 mnt->flags |= NFS_MOUNT_NONLM; 1249 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1250 NFS_MOUNT_LOCAL_FCNTL); 1251 break; 1252 case Opt_udp: 1253 mnt->flags &= ~NFS_MOUNT_TCP; 1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1255 break; 1256 case Opt_tcp: 1257 mnt->flags |= NFS_MOUNT_TCP; 1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1259 break; 1260 case Opt_rdma: 1261 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1263 xprt_load_transport(p); 1264 break; 1265 case Opt_acl: 1266 mnt->flags &= ~NFS_MOUNT_NOACL; 1267 break; 1268 case Opt_noacl: 1269 mnt->flags |= NFS_MOUNT_NOACL; 1270 break; 1271 case Opt_rdirplus: 1272 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1273 break; 1274 case Opt_nordirplus: 1275 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1276 break; 1277 case Opt_sharecache: 1278 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1279 break; 1280 case Opt_nosharecache: 1281 mnt->flags |= NFS_MOUNT_UNSHARED; 1282 break; 1283 case Opt_resvport: 1284 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1285 break; 1286 case Opt_noresvport: 1287 mnt->flags |= NFS_MOUNT_NORESVPORT; 1288 break; 1289 case Opt_fscache: 1290 mnt->options |= NFS_OPTION_FSCACHE; 1291 kfree(mnt->fscache_uniq); 1292 mnt->fscache_uniq = NULL; 1293 break; 1294 case Opt_nofscache: 1295 mnt->options &= ~NFS_OPTION_FSCACHE; 1296 kfree(mnt->fscache_uniq); 1297 mnt->fscache_uniq = NULL; 1298 break; 1299 1300 /* 1301 * options that take numeric values 1302 */ 1303 case Opt_port: 1304 if (nfs_get_option_ul(args, &option) || 1305 option > USHRT_MAX) 1306 goto out_invalid_value; 1307 mnt->nfs_server.port = option; 1308 break; 1309 case Opt_rsize: 1310 if (nfs_get_option_ul(args, &option)) 1311 goto out_invalid_value; 1312 mnt->rsize = option; 1313 break; 1314 case Opt_wsize: 1315 if (nfs_get_option_ul(args, &option)) 1316 goto out_invalid_value; 1317 mnt->wsize = option; 1318 break; 1319 case Opt_bsize: 1320 if (nfs_get_option_ul(args, &option)) 1321 goto out_invalid_value; 1322 mnt->bsize = option; 1323 break; 1324 case Opt_timeo: 1325 if (nfs_get_option_ul(args, &option) || option == 0) 1326 goto out_invalid_value; 1327 mnt->timeo = option; 1328 break; 1329 case Opt_retrans: 1330 if (nfs_get_option_ul(args, &option) || option == 0) 1331 goto out_invalid_value; 1332 mnt->retrans = option; 1333 break; 1334 case Opt_acregmin: 1335 if (nfs_get_option_ul(args, &option)) 1336 goto out_invalid_value; 1337 mnt->acregmin = option; 1338 break; 1339 case Opt_acregmax: 1340 if (nfs_get_option_ul(args, &option)) 1341 goto out_invalid_value; 1342 mnt->acregmax = option; 1343 break; 1344 case Opt_acdirmin: 1345 if (nfs_get_option_ul(args, &option)) 1346 goto out_invalid_value; 1347 mnt->acdirmin = option; 1348 break; 1349 case Opt_acdirmax: 1350 if (nfs_get_option_ul(args, &option)) 1351 goto out_invalid_value; 1352 mnt->acdirmax = option; 1353 break; 1354 case Opt_actimeo: 1355 if (nfs_get_option_ul(args, &option)) 1356 goto out_invalid_value; 1357 mnt->acregmin = mnt->acregmax = 1358 mnt->acdirmin = mnt->acdirmax = option; 1359 break; 1360 case Opt_namelen: 1361 if (nfs_get_option_ul(args, &option)) 1362 goto out_invalid_value; 1363 mnt->namlen = option; 1364 break; 1365 case Opt_mountport: 1366 if (nfs_get_option_ul(args, &option) || 1367 option > USHRT_MAX) 1368 goto out_invalid_value; 1369 mnt->mount_server.port = option; 1370 break; 1371 case Opt_mountvers: 1372 if (nfs_get_option_ul(args, &option) || 1373 option < NFS_MNT_VERSION || 1374 option > NFS_MNT3_VERSION) 1375 goto out_invalid_value; 1376 mnt->mount_server.version = option; 1377 break; 1378 case Opt_minorversion: 1379 if (nfs_get_option_ul(args, &option)) 1380 goto out_invalid_value; 1381 if (option > NFS4_MAX_MINOR_VERSION) 1382 goto out_invalid_value; 1383 mnt->minorversion = option; 1384 break; 1385 1386 /* 1387 * options that take text values 1388 */ 1389 case Opt_nfsvers: 1390 string = match_strdup(args); 1391 if (string == NULL) 1392 goto out_nomem; 1393 rc = nfs_parse_version_string(string, mnt, args); 1394 kfree(string); 1395 if (!rc) 1396 goto out_invalid_value; 1397 break; 1398 case Opt_sec: 1399 string = match_strdup(args); 1400 if (string == NULL) 1401 goto out_nomem; 1402 rc = nfs_parse_security_flavors(string, mnt); 1403 kfree(string); 1404 if (!rc) { 1405 dfprintk(MOUNT, "NFS: unrecognized " 1406 "security flavor\n"); 1407 return 0; 1408 } 1409 break; 1410 case Opt_proto: 1411 string = match_strdup(args); 1412 if (string == NULL) 1413 goto out_nomem; 1414 token = match_token(string, 1415 nfs_xprt_protocol_tokens, args); 1416 1417 protofamily = AF_INET; 1418 switch (token) { 1419 case Opt_xprt_udp6: 1420 protofamily = AF_INET6; 1421 case Opt_xprt_udp: 1422 mnt->flags &= ~NFS_MOUNT_TCP; 1423 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1424 break; 1425 case Opt_xprt_tcp6: 1426 protofamily = AF_INET6; 1427 case Opt_xprt_tcp: 1428 mnt->flags |= NFS_MOUNT_TCP; 1429 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1430 break; 1431 case Opt_xprt_rdma: 1432 /* vector side protocols to TCP */ 1433 mnt->flags |= NFS_MOUNT_TCP; 1434 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1435 xprt_load_transport(string); 1436 break; 1437 default: 1438 dfprintk(MOUNT, "NFS: unrecognized " 1439 "transport protocol\n"); 1440 kfree(string); 1441 return 0; 1442 } 1443 kfree(string); 1444 break; 1445 case Opt_mountproto: 1446 string = match_strdup(args); 1447 if (string == NULL) 1448 goto out_nomem; 1449 token = match_token(string, 1450 nfs_xprt_protocol_tokens, args); 1451 kfree(string); 1452 1453 mountfamily = AF_INET; 1454 switch (token) { 1455 case Opt_xprt_udp6: 1456 mountfamily = AF_INET6; 1457 case Opt_xprt_udp: 1458 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1459 break; 1460 case Opt_xprt_tcp6: 1461 mountfamily = AF_INET6; 1462 case Opt_xprt_tcp: 1463 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1464 break; 1465 case Opt_xprt_rdma: /* not used for side protocols */ 1466 default: 1467 dfprintk(MOUNT, "NFS: unrecognized " 1468 "transport protocol\n"); 1469 return 0; 1470 } 1471 break; 1472 case Opt_addr: 1473 string = match_strdup(args); 1474 if (string == NULL) 1475 goto out_nomem; 1476 mnt->nfs_server.addrlen = 1477 rpc_pton(mnt->net, string, strlen(string), 1478 (struct sockaddr *) 1479 &mnt->nfs_server.address, 1480 sizeof(mnt->nfs_server.address)); 1481 kfree(string); 1482 if (mnt->nfs_server.addrlen == 0) 1483 goto out_invalid_address; 1484 break; 1485 case Opt_clientaddr: 1486 if (nfs_get_option_str(args, &mnt->client_address)) 1487 goto out_nomem; 1488 break; 1489 case Opt_mounthost: 1490 if (nfs_get_option_str(args, 1491 &mnt->mount_server.hostname)) 1492 goto out_nomem; 1493 break; 1494 case Opt_mountaddr: 1495 string = match_strdup(args); 1496 if (string == NULL) 1497 goto out_nomem; 1498 mnt->mount_server.addrlen = 1499 rpc_pton(mnt->net, string, strlen(string), 1500 (struct sockaddr *) 1501 &mnt->mount_server.address, 1502 sizeof(mnt->mount_server.address)); 1503 kfree(string); 1504 if (mnt->mount_server.addrlen == 0) 1505 goto out_invalid_address; 1506 break; 1507 case Opt_lookupcache: 1508 string = match_strdup(args); 1509 if (string == NULL) 1510 goto out_nomem; 1511 token = match_token(string, 1512 nfs_lookupcache_tokens, args); 1513 kfree(string); 1514 switch (token) { 1515 case Opt_lookupcache_all: 1516 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1517 break; 1518 case Opt_lookupcache_positive: 1519 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1521 break; 1522 case Opt_lookupcache_none: 1523 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1524 break; 1525 default: 1526 dfprintk(MOUNT, "NFS: invalid " 1527 "lookupcache argument\n"); 1528 return 0; 1529 }; 1530 break; 1531 case Opt_fscache_uniq: 1532 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1533 goto out_nomem; 1534 mnt->options |= NFS_OPTION_FSCACHE; 1535 break; 1536 case Opt_local_lock: 1537 string = match_strdup(args); 1538 if (string == NULL) 1539 goto out_nomem; 1540 token = match_token(string, nfs_local_lock_tokens, 1541 args); 1542 kfree(string); 1543 switch (token) { 1544 case Opt_local_lock_all: 1545 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1546 NFS_MOUNT_LOCAL_FCNTL); 1547 break; 1548 case Opt_local_lock_flock: 1549 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1550 break; 1551 case Opt_local_lock_posix: 1552 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1553 break; 1554 case Opt_local_lock_none: 1555 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1556 NFS_MOUNT_LOCAL_FCNTL); 1557 break; 1558 default: 1559 dfprintk(MOUNT, "NFS: invalid " 1560 "local_lock argument\n"); 1561 return 0; 1562 }; 1563 break; 1564 1565 /* 1566 * Special options 1567 */ 1568 case Opt_sloppy: 1569 sloppy = 1; 1570 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1571 break; 1572 case Opt_userspace: 1573 case Opt_deprecated: 1574 dfprintk(MOUNT, "NFS: ignoring mount option " 1575 "'%s'\n", p); 1576 break; 1577 1578 default: 1579 invalid_option = 1; 1580 dfprintk(MOUNT, "NFS: unrecognized mount option " 1581 "'%s'\n", p); 1582 } 1583 } 1584 1585 if (!sloppy && invalid_option) 1586 return 0; 1587 1588 if (mnt->minorversion && mnt->version != 4) 1589 goto out_minorversion_mismatch; 1590 1591 /* 1592 * verify that any proto=/mountproto= options match the address 1593 * familiies in the addr=/mountaddr= options. 1594 */ 1595 if (protofamily != AF_UNSPEC && 1596 protofamily != mnt->nfs_server.address.ss_family) 1597 goto out_proto_mismatch; 1598 1599 if (mountfamily != AF_UNSPEC) { 1600 if (mnt->mount_server.addrlen) { 1601 if (mountfamily != mnt->mount_server.address.ss_family) 1602 goto out_mountproto_mismatch; 1603 } else { 1604 if (mountfamily != mnt->nfs_server.address.ss_family) 1605 goto out_mountproto_mismatch; 1606 } 1607 } 1608 1609 return 1; 1610 1611 out_mountproto_mismatch: 1612 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1613 "option\n"); 1614 return 0; 1615 out_proto_mismatch: 1616 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1617 return 0; 1618 out_invalid_address: 1619 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1620 return 0; 1621 out_invalid_value: 1622 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1623 return 0; 1624 out_minorversion_mismatch: 1625 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1626 "minorversion=%u\n", mnt->version, mnt->minorversion); 1627 return 0; 1628 out_nomem: 1629 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1630 return 0; 1631 out_security_failure: 1632 free_secdata(secdata); 1633 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1634 return 0; 1635 } 1636 1637 /* 1638 * Match the requested auth flavors with the list returned by 1639 * the server. Returns zero and sets the mount's authentication 1640 * flavor on success; returns -EACCES if server does not support 1641 * the requested flavor. 1642 */ 1643 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1644 struct nfs_mount_request *request) 1645 { 1646 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1647 1648 /* 1649 * Certain releases of Linux's mountd return an empty 1650 * flavor list. To prevent behavioral regression with 1651 * these servers (ie. rejecting mounts that used to 1652 * succeed), revert to pre-2.6.32 behavior (no checking) 1653 * if the returned flavor list is empty. 1654 */ 1655 if (server_authlist_len == 0) 1656 return 0; 1657 1658 /* 1659 * We avoid sophisticated negotiating here, as there are 1660 * plenty of cases where we can get it wrong, providing 1661 * either too little or too much security. 1662 * 1663 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1664 * flavor listed first. However, some servers list 1665 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1666 * preferred default, in args->auth_flavors[0] if user 1667 * didn't specify sec= mount option. 1668 */ 1669 for (i = 0; i < args->auth_flavor_len; i++) 1670 for (j = 0; j < server_authlist_len; j++) 1671 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1672 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1673 request->auth_flavs[j]); 1674 args->auth_flavors[0] = request->auth_flavs[j]; 1675 return 0; 1676 } 1677 1678 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1679 nfs_umount(request); 1680 return -EACCES; 1681 } 1682 1683 /* 1684 * Use the remote server's MOUNT service to request the NFS file handle 1685 * corresponding to the provided path. 1686 */ 1687 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1688 struct nfs_fh *root_fh) 1689 { 1690 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1691 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1692 struct nfs_mount_request request = { 1693 .sap = (struct sockaddr *) 1694 &args->mount_server.address, 1695 .dirpath = args->nfs_server.export_path, 1696 .protocol = args->mount_server.protocol, 1697 .fh = root_fh, 1698 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1699 .auth_flav_len = &server_authlist_len, 1700 .auth_flavs = server_authlist, 1701 .net = args->net, 1702 }; 1703 int status; 1704 1705 if (args->mount_server.version == 0) { 1706 switch (args->version) { 1707 default: 1708 args->mount_server.version = NFS_MNT3_VERSION; 1709 break; 1710 case 2: 1711 args->mount_server.version = NFS_MNT_VERSION; 1712 } 1713 } 1714 request.version = args->mount_server.version; 1715 1716 if (args->mount_server.hostname) 1717 request.hostname = args->mount_server.hostname; 1718 else 1719 request.hostname = args->nfs_server.hostname; 1720 1721 /* 1722 * Construct the mount server's address. 1723 */ 1724 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1725 memcpy(request.sap, &args->nfs_server.address, 1726 args->nfs_server.addrlen); 1727 args->mount_server.addrlen = args->nfs_server.addrlen; 1728 } 1729 request.salen = args->mount_server.addrlen; 1730 nfs_set_port(request.sap, &args->mount_server.port, 0); 1731 1732 /* 1733 * Now ask the mount server to map our export path 1734 * to a file handle. 1735 */ 1736 status = nfs_mount(&request); 1737 if (status != 0) { 1738 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1739 request.hostname, status); 1740 return status; 1741 } 1742 1743 /* 1744 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1745 */ 1746 if (args->mount_server.version != NFS_MNT3_VERSION) 1747 return 0; 1748 return nfs_walk_authlist(args, &request); 1749 } 1750 1751 static struct dentry *nfs_try_mount(int flags, const char *dev_name, 1752 struct nfs_mount_info *mount_info) 1753 { 1754 int status; 1755 struct nfs_server *server; 1756 1757 if (mount_info->parsed->need_mount) { 1758 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1759 if (status) 1760 return ERR_PTR(status); 1761 } 1762 1763 /* Get a volume representation */ 1764 server = nfs_create_server(mount_info->parsed, mount_info->mntfh); 1765 if (IS_ERR(server)) 1766 return ERR_CAST(server); 1767 1768 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info); 1769 } 1770 1771 /* 1772 * Split "dev_name" into "hostname:export_path". 1773 * 1774 * The leftmost colon demarks the split between the server's hostname 1775 * and the export path. If the hostname starts with a left square 1776 * bracket, then it may contain colons. 1777 * 1778 * Note: caller frees hostname and export path, even on error. 1779 */ 1780 static int nfs_parse_devname(const char *dev_name, 1781 char **hostname, size_t maxnamlen, 1782 char **export_path, size_t maxpathlen) 1783 { 1784 size_t len; 1785 char *end; 1786 1787 /* Is the host name protected with square brakcets? */ 1788 if (*dev_name == '[') { 1789 end = strchr(++dev_name, ']'); 1790 if (end == NULL || end[1] != ':') 1791 goto out_bad_devname; 1792 1793 len = end - dev_name; 1794 end++; 1795 } else { 1796 char *comma; 1797 1798 end = strchr(dev_name, ':'); 1799 if (end == NULL) 1800 goto out_bad_devname; 1801 len = end - dev_name; 1802 1803 /* kill possible hostname list: not supported */ 1804 comma = strchr(dev_name, ','); 1805 if (comma != NULL && comma < end) 1806 *comma = 0; 1807 } 1808 1809 if (len > maxnamlen) 1810 goto out_hostname; 1811 1812 /* N.B. caller will free nfs_server.hostname in all cases */ 1813 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1814 if (*hostname == NULL) 1815 goto out_nomem; 1816 len = strlen(++end); 1817 if (len > maxpathlen) 1818 goto out_path; 1819 *export_path = kstrndup(end, len, GFP_KERNEL); 1820 if (!*export_path) 1821 goto out_nomem; 1822 1823 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1824 return 0; 1825 1826 out_bad_devname: 1827 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1828 return -EINVAL; 1829 1830 out_nomem: 1831 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1832 return -ENOMEM; 1833 1834 out_hostname: 1835 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1836 return -ENAMETOOLONG; 1837 1838 out_path: 1839 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1840 return -ENAMETOOLONG; 1841 } 1842 1843 /* 1844 * Validate the NFS2/NFS3 mount data 1845 * - fills in the mount root filehandle 1846 * 1847 * For option strings, user space handles the following behaviors: 1848 * 1849 * + DNS: mapping server host name to IP address ("addr=" option) 1850 * 1851 * + failure mode: how to behave if a mount request can't be handled 1852 * immediately ("fg/bg" option) 1853 * 1854 * + retry: how often to retry a mount request ("retry=" option) 1855 * 1856 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1857 * mountproto=tcp after mountproto=udp, and so on 1858 */ 1859 static int nfs23_validate_mount_data(void *options, 1860 struct nfs_parsed_mount_data *args, 1861 struct nfs_fh *mntfh, 1862 const char *dev_name) 1863 { 1864 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1865 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1866 1867 if (data == NULL) 1868 goto out_no_data; 1869 1870 args->version = NFS_DEFAULT_VERSION; 1871 switch (data->version) { 1872 case 1: 1873 data->namlen = 0; 1874 case 2: 1875 data->bsize = 0; 1876 case 3: 1877 if (data->flags & NFS_MOUNT_VER3) 1878 goto out_no_v3; 1879 data->root.size = NFS2_FHSIZE; 1880 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1881 case 4: 1882 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1883 goto out_no_sec; 1884 case 5: 1885 memset(data->context, 0, sizeof(data->context)); 1886 case 6: 1887 if (data->flags & NFS_MOUNT_VER3) { 1888 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1889 goto out_invalid_fh; 1890 mntfh->size = data->root.size; 1891 args->version = 3; 1892 } else { 1893 mntfh->size = NFS2_FHSIZE; 1894 args->version = 2; 1895 } 1896 1897 1898 memcpy(mntfh->data, data->root.data, mntfh->size); 1899 if (mntfh->size < sizeof(mntfh->data)) 1900 memset(mntfh->data + mntfh->size, 0, 1901 sizeof(mntfh->data) - mntfh->size); 1902 1903 /* 1904 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1905 * can deal with. 1906 */ 1907 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1908 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1909 args->rsize = data->rsize; 1910 args->wsize = data->wsize; 1911 args->timeo = data->timeo; 1912 args->retrans = data->retrans; 1913 args->acregmin = data->acregmin; 1914 args->acregmax = data->acregmax; 1915 args->acdirmin = data->acdirmin; 1916 args->acdirmax = data->acdirmax; 1917 args->need_mount = false; 1918 1919 memcpy(sap, &data->addr, sizeof(data->addr)); 1920 args->nfs_server.addrlen = sizeof(data->addr); 1921 if (!nfs_verify_server_address(sap)) 1922 goto out_no_address; 1923 1924 if (!(data->flags & NFS_MOUNT_TCP)) 1925 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1926 /* N.B. caller will free nfs_server.hostname in all cases */ 1927 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1928 args->namlen = data->namlen; 1929 args->bsize = data->bsize; 1930 1931 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1932 args->auth_flavors[0] = data->pseudoflavor; 1933 if (!args->nfs_server.hostname) 1934 goto out_nomem; 1935 1936 if (!(data->flags & NFS_MOUNT_NONLM)) 1937 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1938 NFS_MOUNT_LOCAL_FCNTL); 1939 else 1940 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1941 NFS_MOUNT_LOCAL_FCNTL); 1942 /* 1943 * The legacy version 6 binary mount data from userspace has a 1944 * field used only to transport selinux information into the 1945 * the kernel. To continue to support that functionality we 1946 * have a touch of selinux knowledge here in the NFS code. The 1947 * userspace code converted context=blah to just blah so we are 1948 * converting back to the full string selinux understands. 1949 */ 1950 if (data->context[0]){ 1951 #ifdef CONFIG_SECURITY_SELINUX 1952 int rc; 1953 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1954 if (!opts_str) 1955 return -ENOMEM; 1956 strcpy(opts_str, "context="); 1957 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1958 strcat(opts_str, &data->context[0]); 1959 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1960 kfree(opts_str); 1961 if (rc) 1962 return rc; 1963 #else 1964 return -EINVAL; 1965 #endif 1966 } 1967 1968 break; 1969 default: 1970 return NFS_TEXT_DATA; 1971 } 1972 1973 #ifndef CONFIG_NFS_V3 1974 if (args->version == 3) 1975 goto out_v3_not_compiled; 1976 #endif /* !CONFIG_NFS_V3 */ 1977 1978 return 0; 1979 1980 out_no_data: 1981 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1982 return -EINVAL; 1983 1984 out_no_v3: 1985 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1986 data->version); 1987 return -EINVAL; 1988 1989 out_no_sec: 1990 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1991 return -EINVAL; 1992 1993 #ifndef CONFIG_NFS_V3 1994 out_v3_not_compiled: 1995 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1996 return -EPROTONOSUPPORT; 1997 #endif /* !CONFIG_NFS_V3 */ 1998 1999 out_nomem: 2000 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2001 return -ENOMEM; 2002 2003 out_no_address: 2004 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2005 return -EINVAL; 2006 2007 out_invalid_fh: 2008 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2009 return -EINVAL; 2010 } 2011 2012 #ifdef CONFIG_NFS_V4 2013 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2014 void *options, 2015 struct nfs_parsed_mount_data *args, 2016 struct nfs_fh *mntfh, 2017 const char *dev_name) 2018 { 2019 if (fs_type == &nfs_fs_type) 2020 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2021 return nfs4_validate_mount_data(options, args, dev_name); 2022 } 2023 #else 2024 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2025 void *options, 2026 struct nfs_parsed_mount_data *args, 2027 struct nfs_fh *mntfh, 2028 const char *dev_name) 2029 { 2030 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2031 } 2032 #endif 2033 2034 static int nfs_validate_text_mount_data(void *options, 2035 struct nfs_parsed_mount_data *args, 2036 const char *dev_name) 2037 { 2038 int port = 0; 2039 int max_namelen = PAGE_SIZE; 2040 int max_pathlen = NFS_MAXPATHLEN; 2041 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2042 2043 if (nfs_parse_mount_options((char *)options, args) == 0) 2044 return -EINVAL; 2045 2046 if (!nfs_verify_server_address(sap)) 2047 goto out_no_address; 2048 2049 if (args->version == 4) { 2050 #ifdef CONFIG_NFS_V4 2051 port = NFS_PORT; 2052 max_namelen = NFS4_MAXNAMLEN; 2053 max_pathlen = NFS4_MAXPATHLEN; 2054 nfs_validate_transport_protocol(args); 2055 nfs4_validate_mount_flags(args); 2056 #else 2057 goto out_v4_not_compiled; 2058 #endif /* CONFIG_NFS_V4 */ 2059 } else 2060 nfs_set_mount_transport_protocol(args); 2061 2062 nfs_set_port(sap, &args->nfs_server.port, port); 2063 2064 if (args->auth_flavor_len > 1) 2065 goto out_bad_auth; 2066 2067 return nfs_parse_devname(dev_name, 2068 &args->nfs_server.hostname, 2069 max_namelen, 2070 &args->nfs_server.export_path, 2071 max_pathlen); 2072 2073 #ifndef CONFIG_NFS_V4 2074 out_v4_not_compiled: 2075 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2076 return -EPROTONOSUPPORT; 2077 #endif /* !CONFIG_NFS_V4 */ 2078 2079 out_no_address: 2080 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2081 return -EINVAL; 2082 2083 out_bad_auth: 2084 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2085 return -EINVAL; 2086 } 2087 2088 static int 2089 nfs_compare_remount_data(struct nfs_server *nfss, 2090 struct nfs_parsed_mount_data *data) 2091 { 2092 if (data->flags != nfss->flags || 2093 data->rsize != nfss->rsize || 2094 data->wsize != nfss->wsize || 2095 data->retrans != nfss->client->cl_timeout->to_retries || 2096 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2097 data->acregmin != nfss->acregmin / HZ || 2098 data->acregmax != nfss->acregmax / HZ || 2099 data->acdirmin != nfss->acdirmin / HZ || 2100 data->acdirmax != nfss->acdirmax / HZ || 2101 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2102 data->nfs_server.port != nfss->port || 2103 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2104 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2105 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2106 return -EINVAL; 2107 2108 return 0; 2109 } 2110 2111 static int 2112 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2113 { 2114 int error; 2115 struct nfs_server *nfss = sb->s_fs_info; 2116 struct nfs_parsed_mount_data *data; 2117 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2118 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2119 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2120 2121 /* 2122 * Userspace mount programs that send binary options generally send 2123 * them populated with default values. We have no way to know which 2124 * ones were explicitly specified. Fall back to legacy behavior and 2125 * just return success. 2126 */ 2127 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2128 (nfsvers <= 3 && (!options || (options->version >= 1 && 2129 options->version <= 6)))) 2130 return 0; 2131 2132 data = kzalloc(sizeof(*data), GFP_KERNEL); 2133 if (data == NULL) 2134 return -ENOMEM; 2135 2136 /* fill out struct with values from existing mount */ 2137 data->flags = nfss->flags; 2138 data->rsize = nfss->rsize; 2139 data->wsize = nfss->wsize; 2140 data->retrans = nfss->client->cl_timeout->to_retries; 2141 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2142 data->acregmin = nfss->acregmin / HZ; 2143 data->acregmax = nfss->acregmax / HZ; 2144 data->acdirmin = nfss->acdirmin / HZ; 2145 data->acdirmax = nfss->acdirmax / HZ; 2146 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2147 data->nfs_server.port = nfss->port; 2148 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2149 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2150 data->nfs_server.addrlen); 2151 2152 /* overwrite those values with any that were specified */ 2153 error = nfs_parse_mount_options((char *)options, data); 2154 if (error < 0) 2155 goto out; 2156 2157 /* 2158 * noac is a special case. It implies -o sync, but that's not 2159 * necessarily reflected in the mtab options. do_remount_sb 2160 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2161 * remount options, so we have to explicitly reset it. 2162 */ 2163 if (data->flags & NFS_MOUNT_NOAC) 2164 *flags |= MS_SYNCHRONOUS; 2165 2166 /* compare new mount options with old ones */ 2167 error = nfs_compare_remount_data(nfss, data); 2168 out: 2169 kfree(data); 2170 return error; 2171 } 2172 2173 /* 2174 * Initialise the common bits of the superblock 2175 */ 2176 static inline void nfs_initialise_sb(struct super_block *sb) 2177 { 2178 struct nfs_server *server = NFS_SB(sb); 2179 2180 sb->s_magic = NFS_SUPER_MAGIC; 2181 2182 /* We probably want something more informative here */ 2183 snprintf(sb->s_id, sizeof(sb->s_id), 2184 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2185 2186 if (sb->s_blocksize == 0) 2187 sb->s_blocksize = nfs_block_bits(server->wsize, 2188 &sb->s_blocksize_bits); 2189 2190 sb->s_bdi = &server->backing_dev_info; 2191 2192 nfs_super_set_maxbytes(sb, server->maxfilesize); 2193 } 2194 2195 /* 2196 * Finish setting up an NFS2/3 superblock 2197 */ 2198 static void nfs_fill_super(struct super_block *sb, 2199 struct nfs_mount_info *mount_info) 2200 { 2201 struct nfs_parsed_mount_data *data = mount_info->parsed; 2202 struct nfs_server *server = NFS_SB(sb); 2203 2204 sb->s_blocksize_bits = 0; 2205 sb->s_blocksize = 0; 2206 if (data->bsize) 2207 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2208 2209 if (server->nfs_client->rpc_ops->version == 3) { 2210 /* The VFS shouldn't apply the umask to mode bits. We will do 2211 * so ourselves when necessary. 2212 */ 2213 sb->s_flags |= MS_POSIXACL; 2214 sb->s_time_gran = 1; 2215 } 2216 2217 sb->s_op = &nfs_sops; 2218 nfs_initialise_sb(sb); 2219 } 2220 2221 /* 2222 * Finish setting up a cloned NFS2/3 superblock 2223 */ 2224 static void nfs_clone_super(struct super_block *sb, 2225 struct nfs_mount_info *mount_info) 2226 { 2227 const struct super_block *old_sb = mount_info->cloned->sb; 2228 struct nfs_server *server = NFS_SB(sb); 2229 2230 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2231 sb->s_blocksize = old_sb->s_blocksize; 2232 sb->s_maxbytes = old_sb->s_maxbytes; 2233 2234 if (server->nfs_client->rpc_ops->version == 3) { 2235 /* The VFS shouldn't apply the umask to mode bits. We will do 2236 * so ourselves when necessary. 2237 */ 2238 sb->s_flags |= MS_POSIXACL; 2239 sb->s_time_gran = 1; 2240 } 2241 2242 sb->s_op = old_sb->s_op; 2243 nfs_initialise_sb(sb); 2244 } 2245 2246 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2247 { 2248 const struct nfs_server *a = s->s_fs_info; 2249 const struct rpc_clnt *clnt_a = a->client; 2250 const struct rpc_clnt *clnt_b = b->client; 2251 2252 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2253 goto Ebusy; 2254 if (a->nfs_client != b->nfs_client) 2255 goto Ebusy; 2256 if (a->flags != b->flags) 2257 goto Ebusy; 2258 if (a->wsize != b->wsize) 2259 goto Ebusy; 2260 if (a->rsize != b->rsize) 2261 goto Ebusy; 2262 if (a->acregmin != b->acregmin) 2263 goto Ebusy; 2264 if (a->acregmax != b->acregmax) 2265 goto Ebusy; 2266 if (a->acdirmin != b->acdirmin) 2267 goto Ebusy; 2268 if (a->acdirmax != b->acdirmax) 2269 goto Ebusy; 2270 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2271 goto Ebusy; 2272 return 1; 2273 Ebusy: 2274 return 0; 2275 } 2276 2277 struct nfs_sb_mountdata { 2278 struct nfs_server *server; 2279 int mntflags; 2280 }; 2281 2282 static int nfs_set_super(struct super_block *s, void *data) 2283 { 2284 struct nfs_sb_mountdata *sb_mntdata = data; 2285 struct nfs_server *server = sb_mntdata->server; 2286 int ret; 2287 2288 s->s_flags = sb_mntdata->mntflags; 2289 s->s_fs_info = server; 2290 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2291 ret = set_anon_super(s, server); 2292 if (ret == 0) 2293 server->s_dev = s->s_dev; 2294 return ret; 2295 } 2296 2297 static int nfs_compare_super_address(struct nfs_server *server1, 2298 struct nfs_server *server2) 2299 { 2300 struct sockaddr *sap1, *sap2; 2301 2302 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2303 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2304 2305 if (sap1->sa_family != sap2->sa_family) 2306 return 0; 2307 2308 switch (sap1->sa_family) { 2309 case AF_INET: { 2310 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2311 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2312 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2313 return 0; 2314 if (sin1->sin_port != sin2->sin_port) 2315 return 0; 2316 break; 2317 } 2318 case AF_INET6: { 2319 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2320 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2321 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2322 return 0; 2323 if (sin1->sin6_port != sin2->sin6_port) 2324 return 0; 2325 break; 2326 } 2327 default: 2328 return 0; 2329 } 2330 2331 return 1; 2332 } 2333 2334 static int nfs_compare_super(struct super_block *sb, void *data) 2335 { 2336 struct nfs_sb_mountdata *sb_mntdata = data; 2337 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2338 int mntflags = sb_mntdata->mntflags; 2339 2340 if (!nfs_compare_super_address(old, server)) 2341 return 0; 2342 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2343 if (old->flags & NFS_MOUNT_UNSHARED) 2344 return 0; 2345 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2346 return 0; 2347 return nfs_compare_mount_options(sb, server, mntflags); 2348 } 2349 2350 #ifdef CONFIG_NFS_FSCACHE 2351 static void nfs_get_cache_cookie(struct super_block *sb, 2352 struct nfs_parsed_mount_data *parsed, 2353 struct nfs_clone_mount *cloned) 2354 { 2355 char *uniq = NULL; 2356 int ulen = 0; 2357 2358 if (parsed && parsed->fscache_uniq) { 2359 uniq = parsed->fscache_uniq; 2360 ulen = strlen(parsed->fscache_uniq); 2361 } else if (cloned) { 2362 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2363 if (mnt_s->fscache_key) { 2364 uniq = mnt_s->fscache_key->key.uniquifier; 2365 ulen = mnt_s->fscache_key->key.uniq_len; 2366 }; 2367 } 2368 2369 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2370 } 2371 #else 2372 static void nfs_get_cache_cookie(struct super_block *sb, 2373 struct nfs_parsed_mount_data *parsed, 2374 struct nfs_clone_mount *cloned) 2375 { 2376 } 2377 #endif 2378 2379 static int nfs_bdi_register(struct nfs_server *server) 2380 { 2381 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2382 } 2383 2384 static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2385 struct nfs_mount_info *mount_info) 2386 { 2387 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2388 } 2389 2390 static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2391 struct nfs_mount_info *mount_info) 2392 { 2393 /* clone any lsm security options from the parent to the new sb */ 2394 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2395 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2396 return -ESTALE; 2397 return 0; 2398 } 2399 2400 static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type, 2401 struct nfs_server *server, 2402 int flags, const char *dev_name, 2403 struct nfs_mount_info *mount_info) 2404 { 2405 struct super_block *s; 2406 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2407 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2408 struct nfs_sb_mountdata sb_mntdata = { 2409 .mntflags = flags, 2410 .server = server, 2411 }; 2412 int error; 2413 2414 if (server->flags & NFS_MOUNT_UNSHARED) 2415 compare_super = NULL; 2416 2417 /* -o noac implies -o sync */ 2418 if (server->flags & NFS_MOUNT_NOAC) 2419 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2420 2421 /* Get a superblock - note that we may end up sharing one that already exists */ 2422 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2423 if (IS_ERR(s)) { 2424 mntroot = ERR_CAST(s); 2425 goto out_err_nosb; 2426 } 2427 2428 if (s->s_fs_info != server) { 2429 nfs_free_server(server); 2430 server = NULL; 2431 } else { 2432 error = nfs_bdi_register(server); 2433 if (error) { 2434 mntroot = ERR_PTR(error); 2435 goto error_splat_bdi; 2436 } 2437 } 2438 2439 if (!s->s_root) { 2440 /* initial superblock/root creation */ 2441 mount_info->fill_super(s, mount_info); 2442 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2443 } 2444 2445 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2446 if (IS_ERR(mntroot)) 2447 goto error_splat_super; 2448 2449 error = mount_info->set_security(s, mntroot, mount_info); 2450 if (error) 2451 goto error_splat_root; 2452 2453 s->s_flags |= MS_ACTIVE; 2454 2455 out: 2456 return mntroot; 2457 2458 out_err_nosb: 2459 nfs_free_server(server); 2460 goto out; 2461 2462 error_splat_root: 2463 dput(mntroot); 2464 mntroot = ERR_PTR(error); 2465 error_splat_super: 2466 if (server && !s->s_root) 2467 bdi_unregister(&server->backing_dev_info); 2468 error_splat_bdi: 2469 deactivate_locked_super(s); 2470 goto out; 2471 } 2472 2473 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2474 int flags, const char *dev_name, void *raw_data) 2475 { 2476 struct nfs_mount_info mount_info = { 2477 .fill_super = nfs_fill_super, 2478 .set_security = nfs_set_sb_security, 2479 }; 2480 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2481 int error; 2482 2483 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2484 mount_info.mntfh = nfs_alloc_fhandle(); 2485 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2486 goto out; 2487 2488 /* Validate the mount data */ 2489 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2490 if (error == NFS_TEXT_DATA) 2491 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2492 if (error < 0) { 2493 mntroot = ERR_PTR(error); 2494 goto out; 2495 } 2496 2497 #ifdef CONFIG_NFS_V4 2498 if (mount_info.parsed->version == 4) 2499 mntroot = nfs4_try_mount(flags, dev_name, &mount_info); 2500 else 2501 #endif /* CONFIG_NFS_V4 */ 2502 mntroot = nfs_try_mount(flags, dev_name, &mount_info); 2503 2504 out: 2505 nfs_free_parsed_mount_data(mount_info.parsed); 2506 nfs_free_fhandle(mount_info.mntfh); 2507 return mntroot; 2508 } 2509 2510 /* 2511 * Ensure that we unregister the bdi before kill_anon_super 2512 * releases the device name 2513 */ 2514 static void nfs_put_super(struct super_block *s) 2515 { 2516 struct nfs_server *server = NFS_SB(s); 2517 2518 bdi_unregister(&server->backing_dev_info); 2519 } 2520 2521 /* 2522 * Destroy an NFS2/3 superblock 2523 */ 2524 static void nfs_kill_super(struct super_block *s) 2525 { 2526 struct nfs_server *server = NFS_SB(s); 2527 2528 kill_anon_super(s); 2529 nfs_fscache_release_super_cookie(s); 2530 nfs_free_server(server); 2531 } 2532 2533 /* 2534 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2535 */ 2536 static struct dentry * 2537 nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, 2538 const char *dev_name, struct nfs_mount_info *mount_info) 2539 { 2540 struct nfs_clone_mount *data = mount_info->cloned; 2541 struct nfs_server *server; 2542 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2543 int error; 2544 2545 dprintk("--> nfs_xdev_mount_common()\n"); 2546 2547 mount_info->mntfh = data->fh; 2548 2549 /* create a new volume representation */ 2550 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2551 if (IS_ERR(server)) { 2552 error = PTR_ERR(server); 2553 goto out_err; 2554 } 2555 2556 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); 2557 dprintk("<-- nfs_xdev_mount_common() = 0\n"); 2558 out: 2559 return mntroot; 2560 2561 out_err: 2562 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); 2563 goto out; 2564 } 2565 2566 /* 2567 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2568 */ 2569 static struct dentry * 2570 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2571 const char *dev_name, void *raw_data) 2572 { 2573 struct nfs_mount_info mount_info = { 2574 .fill_super = nfs_clone_super, 2575 .set_security = nfs_clone_sb_security, 2576 .cloned = raw_data, 2577 }; 2578 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info); 2579 } 2580 2581 #ifdef CONFIG_NFS_V4 2582 2583 /* 2584 * Finish setting up a cloned NFS4 superblock 2585 */ 2586 static void nfs4_clone_super(struct super_block *sb, 2587 struct nfs_mount_info *mount_info) 2588 { 2589 const struct super_block *old_sb = mount_info->cloned->sb; 2590 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2591 sb->s_blocksize = old_sb->s_blocksize; 2592 sb->s_maxbytes = old_sb->s_maxbytes; 2593 sb->s_time_gran = 1; 2594 sb->s_op = old_sb->s_op; 2595 /* 2596 * The VFS shouldn't apply the umask to mode bits. We will do 2597 * so ourselves when necessary. 2598 */ 2599 sb->s_flags |= MS_POSIXACL; 2600 sb->s_xattr = old_sb->s_xattr; 2601 nfs_initialise_sb(sb); 2602 } 2603 2604 /* 2605 * Set up an NFS4 superblock 2606 */ 2607 static void nfs4_fill_super(struct super_block *sb, 2608 struct nfs_mount_info *mount_info) 2609 { 2610 sb->s_time_gran = 1; 2611 sb->s_op = &nfs4_sops; 2612 /* 2613 * The VFS shouldn't apply the umask to mode bits. We will do 2614 * so ourselves when necessary. 2615 */ 2616 sb->s_flags |= MS_POSIXACL; 2617 sb->s_xattr = nfs4_xattr_handlers; 2618 nfs_initialise_sb(sb); 2619 } 2620 2621 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2622 { 2623 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2624 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2625 } 2626 2627 /* 2628 * Validate NFSv4 mount options 2629 */ 2630 static int nfs4_validate_mount_data(void *options, 2631 struct nfs_parsed_mount_data *args, 2632 const char *dev_name) 2633 { 2634 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2635 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2636 char *c; 2637 2638 if (data == NULL) 2639 goto out_no_data; 2640 2641 args->version = 4; 2642 2643 switch (data->version) { 2644 case 1: 2645 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2646 goto out_no_address; 2647 if (data->host_addrlen == 0) 2648 goto out_no_address; 2649 args->nfs_server.addrlen = data->host_addrlen; 2650 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2651 return -EFAULT; 2652 if (!nfs_verify_server_address(sap)) 2653 goto out_no_address; 2654 2655 if (data->auth_flavourlen) { 2656 if (data->auth_flavourlen > 1) 2657 goto out_inval_auth; 2658 if (copy_from_user(&args->auth_flavors[0], 2659 data->auth_flavours, 2660 sizeof(args->auth_flavors[0]))) 2661 return -EFAULT; 2662 } 2663 2664 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2665 if (IS_ERR(c)) 2666 return PTR_ERR(c); 2667 args->nfs_server.hostname = c; 2668 2669 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2670 if (IS_ERR(c)) 2671 return PTR_ERR(c); 2672 args->nfs_server.export_path = c; 2673 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2674 2675 c = strndup_user(data->client_addr.data, 16); 2676 if (IS_ERR(c)) 2677 return PTR_ERR(c); 2678 args->client_address = c; 2679 2680 /* 2681 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2682 * can deal with. 2683 */ 2684 2685 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2686 args->rsize = data->rsize; 2687 args->wsize = data->wsize; 2688 args->timeo = data->timeo; 2689 args->retrans = data->retrans; 2690 args->acregmin = data->acregmin; 2691 args->acregmax = data->acregmax; 2692 args->acdirmin = data->acdirmin; 2693 args->acdirmax = data->acdirmax; 2694 args->nfs_server.protocol = data->proto; 2695 nfs_validate_transport_protocol(args); 2696 2697 break; 2698 default: 2699 return NFS_TEXT_DATA; 2700 } 2701 2702 return 0; 2703 2704 out_no_data: 2705 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2706 return -EINVAL; 2707 2708 out_inval_auth: 2709 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2710 data->auth_flavourlen); 2711 return -EINVAL; 2712 2713 out_no_address: 2714 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2715 return -EINVAL; 2716 } 2717 2718 /* 2719 * Get the superblock for the NFS4 root partition 2720 */ 2721 static struct dentry * 2722 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2723 const char *dev_name, void *info) 2724 { 2725 struct nfs_mount_info *mount_info = info; 2726 struct nfs_server *server; 2727 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2728 2729 mount_info->fill_super = nfs4_fill_super; 2730 mount_info->set_security = nfs_set_sb_security; 2731 2732 /* Get a volume representation */ 2733 server = nfs4_create_server(mount_info->parsed, mount_info->mntfh); 2734 if (IS_ERR(server)) { 2735 mntroot = ERR_CAST(server); 2736 goto out; 2737 } 2738 2739 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); 2740 2741 out: 2742 return mntroot; 2743 } 2744 2745 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2746 int flags, void *data, const char *hostname) 2747 { 2748 struct vfsmount *root_mnt; 2749 char *root_devname; 2750 size_t len; 2751 2752 len = strlen(hostname) + 5; 2753 root_devname = kmalloc(len, GFP_KERNEL); 2754 if (root_devname == NULL) 2755 return ERR_PTR(-ENOMEM); 2756 /* Does hostname needs to be enclosed in brackets? */ 2757 if (strchr(hostname, ':')) 2758 snprintf(root_devname, len, "[%s]:/", hostname); 2759 else 2760 snprintf(root_devname, len, "%s:/", hostname); 2761 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2762 kfree(root_devname); 2763 return root_mnt; 2764 } 2765 2766 struct nfs_referral_count { 2767 struct list_head list; 2768 const struct task_struct *task; 2769 unsigned int referral_count; 2770 }; 2771 2772 static LIST_HEAD(nfs_referral_count_list); 2773 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2774 2775 static struct nfs_referral_count *nfs_find_referral_count(void) 2776 { 2777 struct nfs_referral_count *p; 2778 2779 list_for_each_entry(p, &nfs_referral_count_list, list) { 2780 if (p->task == current) 2781 return p; 2782 } 2783 return NULL; 2784 } 2785 2786 #define NFS_MAX_NESTED_REFERRALS 2 2787 2788 static int nfs_referral_loop_protect(void) 2789 { 2790 struct nfs_referral_count *p, *new; 2791 int ret = -ENOMEM; 2792 2793 new = kmalloc(sizeof(*new), GFP_KERNEL); 2794 if (!new) 2795 goto out; 2796 new->task = current; 2797 new->referral_count = 1; 2798 2799 ret = 0; 2800 spin_lock(&nfs_referral_count_list_lock); 2801 p = nfs_find_referral_count(); 2802 if (p != NULL) { 2803 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2804 ret = -ELOOP; 2805 else 2806 p->referral_count++; 2807 } else { 2808 list_add(&new->list, &nfs_referral_count_list); 2809 new = NULL; 2810 } 2811 spin_unlock(&nfs_referral_count_list_lock); 2812 kfree(new); 2813 out: 2814 return ret; 2815 } 2816 2817 static void nfs_referral_loop_unprotect(void) 2818 { 2819 struct nfs_referral_count *p; 2820 2821 spin_lock(&nfs_referral_count_list_lock); 2822 p = nfs_find_referral_count(); 2823 p->referral_count--; 2824 if (p->referral_count == 0) 2825 list_del(&p->list); 2826 else 2827 p = NULL; 2828 spin_unlock(&nfs_referral_count_list_lock); 2829 kfree(p); 2830 } 2831 2832 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, 2833 const char *export_path) 2834 { 2835 struct dentry *dentry; 2836 int err; 2837 2838 if (IS_ERR(root_mnt)) 2839 return ERR_CAST(root_mnt); 2840 2841 err = nfs_referral_loop_protect(); 2842 if (err) { 2843 mntput(root_mnt); 2844 return ERR_PTR(err); 2845 } 2846 2847 dentry = mount_subtree(root_mnt, export_path); 2848 nfs_referral_loop_unprotect(); 2849 2850 return dentry; 2851 } 2852 2853 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 2854 struct nfs_mount_info *mount_info) 2855 { 2856 char *export_path; 2857 struct vfsmount *root_mnt; 2858 struct dentry *res; 2859 struct nfs_parsed_mount_data *data = mount_info->parsed; 2860 2861 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2862 2863 export_path = data->nfs_server.export_path; 2864 data->nfs_server.export_path = "/"; 2865 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info, 2866 data->nfs_server.hostname); 2867 data->nfs_server.export_path = export_path; 2868 2869 res = nfs_follow_remote_path(root_mnt, export_path); 2870 2871 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", 2872 IS_ERR(res) ? PTR_ERR(res) : 0, 2873 IS_ERR(res) ? " [error]" : ""); 2874 return res; 2875 } 2876 2877 static void nfs4_kill_super(struct super_block *sb) 2878 { 2879 struct nfs_server *server = NFS_SB(sb); 2880 2881 dprintk("--> %s\n", __func__); 2882 nfs_super_return_all_delegations(sb); 2883 kill_anon_super(sb); 2884 nfs_fscache_release_super_cookie(sb); 2885 nfs_free_server(server); 2886 dprintk("<-- %s\n", __func__); 2887 } 2888 2889 /* 2890 * Clone an NFS4 server record on xdev traversal (FSID-change) 2891 */ 2892 static struct dentry * 2893 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2894 const char *dev_name, void *raw_data) 2895 { 2896 struct nfs_mount_info mount_info = { 2897 .fill_super = nfs4_clone_super, 2898 .set_security = nfs_clone_sb_security, 2899 .cloned = raw_data, 2900 }; 2901 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info); 2902 } 2903 2904 static struct dentry * 2905 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 2906 const char *dev_name, void *raw_data) 2907 { 2908 struct nfs_mount_info mount_info = { 2909 .fill_super = nfs4_fill_super, 2910 .set_security = nfs_clone_sb_security, 2911 .cloned = raw_data, 2912 }; 2913 struct nfs_server *server; 2914 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2915 2916 dprintk("--> nfs4_referral_get_sb()\n"); 2917 2918 mount_info.mntfh = nfs_alloc_fhandle(); 2919 if (mount_info.cloned == NULL || mount_info.mntfh == NULL) 2920 goto out; 2921 2922 /* create a new volume representation */ 2923 server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh); 2924 if (IS_ERR(server)) { 2925 mntroot = ERR_CAST(server); 2926 goto out; 2927 } 2928 2929 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info); 2930 out: 2931 nfs_free_fhandle(mount_info.mntfh); 2932 return mntroot; 2933 } 2934 2935 /* 2936 * Create an NFS4 server record on referral traversal 2937 */ 2938 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 2939 int flags, const char *dev_name, void *raw_data) 2940 { 2941 struct nfs_clone_mount *data = raw_data; 2942 char *export_path; 2943 struct vfsmount *root_mnt; 2944 struct dentry *res; 2945 2946 dprintk("--> nfs4_referral_mount()\n"); 2947 2948 export_path = data->mnt_path; 2949 data->mnt_path = "/"; 2950 2951 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2952 flags, data, data->hostname); 2953 data->mnt_path = export_path; 2954 2955 res = nfs_follow_remote_path(root_mnt, export_path); 2956 dprintk("<-- nfs4_referral_mount() = %ld%s\n", 2957 IS_ERR(res) ? PTR_ERR(res) : 0, 2958 IS_ERR(res) ? " [error]" : ""); 2959 return res; 2960 } 2961 2962 #endif /* CONFIG_NFS_V4 */ 2963