1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/smp_lock.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/mnt_namespace.h> 46 #include <linux/namei.h> 47 #include <linux/nfs_idmap.h> 48 #include <linux/vfs.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/slab.h> 52 #include <net/ipv6.h> 53 #include <linux/netdevice.h> 54 #include <linux/nfs_xdr.h> 55 #include <linux/magic.h> 56 #include <linux/parser.h> 57 58 #include <asm/system.h> 59 #include <asm/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 68 #define NFSDBG_FACILITY NFSDBG_VFS 69 70 enum { 71 /* Mount options that take no arguments */ 72 Opt_soft, Opt_hard, 73 Opt_posix, Opt_noposix, 74 Opt_cto, Opt_nocto, 75 Opt_ac, Opt_noac, 76 Opt_lock, Opt_nolock, 77 Opt_v2, Opt_v3, Opt_v4, 78 Opt_udp, Opt_tcp, Opt_rdma, 79 Opt_acl, Opt_noacl, 80 Opt_rdirplus, Opt_nordirplus, 81 Opt_sharecache, Opt_nosharecache, 82 Opt_resvport, Opt_noresvport, 83 Opt_fscache, Opt_nofscache, 84 85 /* Mount options that take integer arguments */ 86 Opt_port, 87 Opt_rsize, Opt_wsize, Opt_bsize, 88 Opt_timeo, Opt_retrans, 89 Opt_acregmin, Opt_acregmax, 90 Opt_acdirmin, Opt_acdirmax, 91 Opt_actimeo, 92 Opt_namelen, 93 Opt_mountport, 94 Opt_mountvers, 95 Opt_nfsvers, 96 Opt_minorversion, 97 98 /* Mount options that take string arguments */ 99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 100 Opt_addr, Opt_mountaddr, Opt_clientaddr, 101 Opt_lookupcache, 102 Opt_fscache_uniq, 103 Opt_local_lock, 104 105 /* Special mount options */ 106 Opt_userspace, Opt_deprecated, Opt_sloppy, 107 108 Opt_err 109 }; 110 111 static const match_table_t nfs_mount_option_tokens = { 112 { Opt_userspace, "bg" }, 113 { Opt_userspace, "fg" }, 114 { Opt_userspace, "retry=%s" }, 115 116 { Opt_sloppy, "sloppy" }, 117 118 { Opt_soft, "soft" }, 119 { Opt_hard, "hard" }, 120 { Opt_deprecated, "intr" }, 121 { Opt_deprecated, "nointr" }, 122 { Opt_posix, "posix" }, 123 { Opt_noposix, "noposix" }, 124 { Opt_cto, "cto" }, 125 { Opt_nocto, "nocto" }, 126 { Opt_ac, "ac" }, 127 { Opt_noac, "noac" }, 128 { Opt_lock, "lock" }, 129 { Opt_nolock, "nolock" }, 130 { Opt_v2, "v2" }, 131 { Opt_v3, "v3" }, 132 { Opt_v4, "v4" }, 133 { Opt_udp, "udp" }, 134 { Opt_tcp, "tcp" }, 135 { Opt_rdma, "rdma" }, 136 { Opt_acl, "acl" }, 137 { Opt_noacl, "noacl" }, 138 { Opt_rdirplus, "rdirplus" }, 139 { Opt_nordirplus, "nordirplus" }, 140 { Opt_sharecache, "sharecache" }, 141 { Opt_nosharecache, "nosharecache" }, 142 { Opt_resvport, "resvport" }, 143 { Opt_noresvport, "noresvport" }, 144 { Opt_fscache, "fsc" }, 145 { Opt_nofscache, "nofsc" }, 146 147 { Opt_port, "port=%s" }, 148 { Opt_rsize, "rsize=%s" }, 149 { Opt_wsize, "wsize=%s" }, 150 { Opt_bsize, "bsize=%s" }, 151 { Opt_timeo, "timeo=%s" }, 152 { Opt_retrans, "retrans=%s" }, 153 { Opt_acregmin, "acregmin=%s" }, 154 { Opt_acregmax, "acregmax=%s" }, 155 { Opt_acdirmin, "acdirmin=%s" }, 156 { Opt_acdirmax, "acdirmax=%s" }, 157 { Opt_actimeo, "actimeo=%s" }, 158 { Opt_namelen, "namlen=%s" }, 159 { Opt_mountport, "mountport=%s" }, 160 { Opt_mountvers, "mountvers=%s" }, 161 { Opt_nfsvers, "nfsvers=%s" }, 162 { Opt_nfsvers, "vers=%s" }, 163 { Opt_minorversion, "minorversion=%s" }, 164 165 { Opt_sec, "sec=%s" }, 166 { Opt_proto, "proto=%s" }, 167 { Opt_mountproto, "mountproto=%s" }, 168 { Opt_addr, "addr=%s" }, 169 { Opt_clientaddr, "clientaddr=%s" }, 170 { Opt_mounthost, "mounthost=%s" }, 171 { Opt_mountaddr, "mountaddr=%s" }, 172 173 { Opt_lookupcache, "lookupcache=%s" }, 174 { Opt_fscache_uniq, "fsc=%s" }, 175 { Opt_local_lock, "local_lock=%s" }, 176 177 { Opt_err, NULL } 178 }; 179 180 enum { 181 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 182 183 Opt_xprt_err 184 }; 185 186 static const match_table_t nfs_xprt_protocol_tokens = { 187 { Opt_xprt_udp, "udp" }, 188 { Opt_xprt_udp6, "udp6" }, 189 { Opt_xprt_tcp, "tcp" }, 190 { Opt_xprt_tcp6, "tcp6" }, 191 { Opt_xprt_rdma, "rdma" }, 192 193 { Opt_xprt_err, NULL } 194 }; 195 196 enum { 197 Opt_sec_none, Opt_sec_sys, 198 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 199 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 200 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 201 202 Opt_sec_err 203 }; 204 205 static const match_table_t nfs_secflavor_tokens = { 206 { Opt_sec_none, "none" }, 207 { Opt_sec_none, "null" }, 208 { Opt_sec_sys, "sys" }, 209 210 { Opt_sec_krb5, "krb5" }, 211 { Opt_sec_krb5i, "krb5i" }, 212 { Opt_sec_krb5p, "krb5p" }, 213 214 { Opt_sec_lkey, "lkey" }, 215 { Opt_sec_lkeyi, "lkeyi" }, 216 { Opt_sec_lkeyp, "lkeyp" }, 217 218 { Opt_sec_spkm, "spkm3" }, 219 { Opt_sec_spkmi, "spkm3i" }, 220 { Opt_sec_spkmp, "spkm3p" }, 221 222 { Opt_sec_err, NULL } 223 }; 224 225 enum { 226 Opt_lookupcache_all, Opt_lookupcache_positive, 227 Opt_lookupcache_none, 228 229 Opt_lookupcache_err 230 }; 231 232 static match_table_t nfs_lookupcache_tokens = { 233 { Opt_lookupcache_all, "all" }, 234 { Opt_lookupcache_positive, "pos" }, 235 { Opt_lookupcache_positive, "positive" }, 236 { Opt_lookupcache_none, "none" }, 237 238 { Opt_lookupcache_err, NULL } 239 }; 240 241 enum { 242 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 243 Opt_local_lock_none, 244 245 Opt_local_lock_err 246 }; 247 248 static match_table_t nfs_local_lock_tokens = { 249 { Opt_local_lock_all, "all" }, 250 { Opt_local_lock_flock, "flock" }, 251 { Opt_local_lock_posix, "posix" }, 252 { Opt_local_lock_none, "none" }, 253 254 { Opt_local_lock_err, NULL } 255 }; 256 257 258 static void nfs_umount_begin(struct super_block *); 259 static int nfs_statfs(struct dentry *, struct kstatfs *); 260 static int nfs_show_options(struct seq_file *, struct vfsmount *); 261 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 262 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 263 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 264 int flags, const char *dev_name, void *raw_data); 265 static void nfs_put_super(struct super_block *); 266 static void nfs_kill_super(struct super_block *); 267 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 268 269 static struct file_system_type nfs_fs_type = { 270 .owner = THIS_MODULE, 271 .name = "nfs", 272 .get_sb = nfs_get_sb, 273 .kill_sb = nfs_kill_super, 274 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 275 }; 276 277 struct file_system_type nfs_xdev_fs_type = { 278 .owner = THIS_MODULE, 279 .name = "nfs", 280 .mount = nfs_xdev_mount, 281 .kill_sb = nfs_kill_super, 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 283 }; 284 285 static const struct super_operations nfs_sops = { 286 .alloc_inode = nfs_alloc_inode, 287 .destroy_inode = nfs_destroy_inode, 288 .write_inode = nfs_write_inode, 289 .put_super = nfs_put_super, 290 .statfs = nfs_statfs, 291 .evict_inode = nfs_evict_inode, 292 .umount_begin = nfs_umount_begin, 293 .show_options = nfs_show_options, 294 .show_stats = nfs_show_stats, 295 .remount_fs = nfs_remount, 296 }; 297 298 #ifdef CONFIG_NFS_V4 299 static int nfs4_validate_text_mount_data(void *options, 300 struct nfs_parsed_mount_data *args, const char *dev_name); 301 static int nfs4_try_mount(int flags, const char *dev_name, 302 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 303 static int nfs4_get_sb(struct file_system_type *fs_type, 304 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 305 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 306 int flags, const char *dev_name, void *raw_data); 307 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 308 int flags, const char *dev_name, void *raw_data); 309 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 310 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 311 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 312 int flags, const char *dev_name, void *raw_data); 313 static void nfs4_kill_super(struct super_block *sb); 314 315 static struct file_system_type nfs4_fs_type = { 316 .owner = THIS_MODULE, 317 .name = "nfs4", 318 .get_sb = nfs4_get_sb, 319 .kill_sb = nfs4_kill_super, 320 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 321 }; 322 323 static struct file_system_type nfs4_remote_fs_type = { 324 .owner = THIS_MODULE, 325 .name = "nfs4", 326 .mount = nfs4_remote_mount, 327 .kill_sb = nfs4_kill_super, 328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 329 }; 330 331 struct file_system_type nfs4_xdev_fs_type = { 332 .owner = THIS_MODULE, 333 .name = "nfs4", 334 .mount = nfs4_xdev_mount, 335 .kill_sb = nfs4_kill_super, 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 337 }; 338 339 static struct file_system_type nfs4_remote_referral_fs_type = { 340 .owner = THIS_MODULE, 341 .name = "nfs4", 342 .mount = nfs4_remote_referral_mount, 343 .kill_sb = nfs4_kill_super, 344 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 345 }; 346 347 struct file_system_type nfs4_referral_fs_type = { 348 .owner = THIS_MODULE, 349 .name = "nfs4", 350 .get_sb = nfs4_referral_get_sb, 351 .kill_sb = nfs4_kill_super, 352 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 353 }; 354 355 static const struct super_operations nfs4_sops = { 356 .alloc_inode = nfs_alloc_inode, 357 .destroy_inode = nfs_destroy_inode, 358 .write_inode = nfs_write_inode, 359 .put_super = nfs_put_super, 360 .statfs = nfs_statfs, 361 .evict_inode = nfs4_evict_inode, 362 .umount_begin = nfs_umount_begin, 363 .show_options = nfs_show_options, 364 .show_stats = nfs_show_stats, 365 .remount_fs = nfs_remount, 366 }; 367 #endif 368 369 static struct shrinker acl_shrinker = { 370 .shrink = nfs_access_cache_shrinker, 371 .seeks = DEFAULT_SEEKS, 372 }; 373 374 /* 375 * Register the NFS filesystems 376 */ 377 int __init register_nfs_fs(void) 378 { 379 int ret; 380 381 ret = register_filesystem(&nfs_fs_type); 382 if (ret < 0) 383 goto error_0; 384 385 ret = nfs_register_sysctl(); 386 if (ret < 0) 387 goto error_1; 388 #ifdef CONFIG_NFS_V4 389 ret = register_filesystem(&nfs4_fs_type); 390 if (ret < 0) 391 goto error_2; 392 #endif 393 register_shrinker(&acl_shrinker); 394 return 0; 395 396 #ifdef CONFIG_NFS_V4 397 error_2: 398 nfs_unregister_sysctl(); 399 #endif 400 error_1: 401 unregister_filesystem(&nfs_fs_type); 402 error_0: 403 return ret; 404 } 405 406 /* 407 * Unregister the NFS filesystems 408 */ 409 void __exit unregister_nfs_fs(void) 410 { 411 unregister_shrinker(&acl_shrinker); 412 #ifdef CONFIG_NFS_V4 413 unregister_filesystem(&nfs4_fs_type); 414 #endif 415 nfs_unregister_sysctl(); 416 unregister_filesystem(&nfs_fs_type); 417 } 418 419 void nfs_sb_active(struct super_block *sb) 420 { 421 struct nfs_server *server = NFS_SB(sb); 422 423 if (atomic_inc_return(&server->active) == 1) 424 atomic_inc(&sb->s_active); 425 } 426 427 void nfs_sb_deactive(struct super_block *sb) 428 { 429 struct nfs_server *server = NFS_SB(sb); 430 431 if (atomic_dec_and_test(&server->active)) 432 deactivate_super(sb); 433 } 434 435 /* 436 * Deliver file system statistics to userspace 437 */ 438 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 439 { 440 struct nfs_server *server = NFS_SB(dentry->d_sb); 441 unsigned char blockbits; 442 unsigned long blockres; 443 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 444 struct nfs_fsstat res; 445 int error = -ENOMEM; 446 447 res.fattr = nfs_alloc_fattr(); 448 if (res.fattr == NULL) 449 goto out_err; 450 451 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 452 if (unlikely(error == -ESTALE)) { 453 struct dentry *pd_dentry; 454 455 pd_dentry = dget_parent(dentry); 456 if (pd_dentry != NULL) { 457 nfs_zap_caches(pd_dentry->d_inode); 458 dput(pd_dentry); 459 } 460 } 461 nfs_free_fattr(res.fattr); 462 if (error < 0) 463 goto out_err; 464 465 buf->f_type = NFS_SUPER_MAGIC; 466 467 /* 468 * Current versions of glibc do not correctly handle the 469 * case where f_frsize != f_bsize. Eventually we want to 470 * report the value of wtmult in this field. 471 */ 472 buf->f_frsize = dentry->d_sb->s_blocksize; 473 474 /* 475 * On most *nix systems, f_blocks, f_bfree, and f_bavail 476 * are reported in units of f_frsize. Linux hasn't had 477 * an f_frsize field in its statfs struct until recently, 478 * thus historically Linux's sys_statfs reports these 479 * fields in units of f_bsize. 480 */ 481 buf->f_bsize = dentry->d_sb->s_blocksize; 482 blockbits = dentry->d_sb->s_blocksize_bits; 483 blockres = (1 << blockbits) - 1; 484 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 485 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 486 buf->f_bavail = (res.abytes + blockres) >> blockbits; 487 488 buf->f_files = res.tfiles; 489 buf->f_ffree = res.afiles; 490 491 buf->f_namelen = server->namelen; 492 493 return 0; 494 495 out_err: 496 dprintk("%s: statfs error = %d\n", __func__, -error); 497 return error; 498 } 499 500 /* 501 * Map the security flavour number to a name 502 */ 503 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 504 { 505 static const struct { 506 rpc_authflavor_t flavour; 507 const char *str; 508 } sec_flavours[] = { 509 { RPC_AUTH_NULL, "null" }, 510 { RPC_AUTH_UNIX, "sys" }, 511 { RPC_AUTH_GSS_KRB5, "krb5" }, 512 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 513 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 514 { RPC_AUTH_GSS_LKEY, "lkey" }, 515 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 516 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 517 { RPC_AUTH_GSS_SPKM, "spkm" }, 518 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 519 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 520 { UINT_MAX, "unknown" } 521 }; 522 int i; 523 524 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 525 if (sec_flavours[i].flavour == flavour) 526 break; 527 } 528 return sec_flavours[i].str; 529 } 530 531 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 532 int showdefaults) 533 { 534 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 535 536 seq_printf(m, ",mountproto="); 537 switch (sap->sa_family) { 538 case AF_INET: 539 switch (nfss->mountd_protocol) { 540 case IPPROTO_UDP: 541 seq_printf(m, RPCBIND_NETID_UDP); 542 break; 543 case IPPROTO_TCP: 544 seq_printf(m, RPCBIND_NETID_TCP); 545 break; 546 default: 547 if (showdefaults) 548 seq_printf(m, "auto"); 549 } 550 break; 551 case AF_INET6: 552 switch (nfss->mountd_protocol) { 553 case IPPROTO_UDP: 554 seq_printf(m, RPCBIND_NETID_UDP6); 555 break; 556 case IPPROTO_TCP: 557 seq_printf(m, RPCBIND_NETID_TCP6); 558 break; 559 default: 560 if (showdefaults) 561 seq_printf(m, "auto"); 562 } 563 break; 564 default: 565 if (showdefaults) 566 seq_printf(m, "auto"); 567 } 568 } 569 570 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 571 int showdefaults) 572 { 573 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 574 575 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 576 return; 577 578 switch (sap->sa_family) { 579 case AF_INET: { 580 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 581 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 582 break; 583 } 584 case AF_INET6: { 585 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 586 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 587 break; 588 } 589 default: 590 if (showdefaults) 591 seq_printf(m, ",mountaddr=unspecified"); 592 } 593 594 if (nfss->mountd_version || showdefaults) 595 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 596 if (nfss->mountd_port || showdefaults) 597 seq_printf(m, ",mountport=%u", nfss->mountd_port); 598 599 nfs_show_mountd_netid(m, nfss, showdefaults); 600 } 601 602 #ifdef CONFIG_NFS_V4 603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 604 int showdefaults) 605 { 606 struct nfs_client *clp = nfss->nfs_client; 607 608 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 609 seq_printf(m, ",minorversion=%u", clp->cl_minorversion); 610 } 611 #else 612 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 613 int showdefaults) 614 { 615 } 616 #endif 617 618 /* 619 * Describe the mount options in force on this server representation 620 */ 621 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 622 int showdefaults) 623 { 624 static const struct proc_nfs_info { 625 int flag; 626 const char *str; 627 const char *nostr; 628 } nfs_info[] = { 629 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 630 { NFS_MOUNT_POSIX, ",posix", "" }, 631 { NFS_MOUNT_NOCTO, ",nocto", "" }, 632 { NFS_MOUNT_NOAC, ",noac", "" }, 633 { NFS_MOUNT_NONLM, ",nolock", "" }, 634 { NFS_MOUNT_NOACL, ",noacl", "" }, 635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 638 { 0, NULL, NULL } 639 }; 640 const struct proc_nfs_info *nfs_infop; 641 struct nfs_client *clp = nfss->nfs_client; 642 u32 version = clp->rpc_ops->version; 643 int local_flock, local_fcntl; 644 645 seq_printf(m, ",vers=%u", version); 646 seq_printf(m, ",rsize=%u", nfss->rsize); 647 seq_printf(m, ",wsize=%u", nfss->wsize); 648 if (nfss->bsize != 0) 649 seq_printf(m, ",bsize=%u", nfss->bsize); 650 seq_printf(m, ",namlen=%u", nfss->namelen); 651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 660 if (nfss->flags & nfs_infop->flag) 661 seq_puts(m, nfs_infop->str); 662 else 663 seq_puts(m, nfs_infop->nostr); 664 } 665 seq_printf(m, ",proto=%s", 666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 667 if (version == 4) { 668 if (nfss->port != NFS_PORT) 669 seq_printf(m, ",port=%u", nfss->port); 670 } else 671 if (nfss->port) 672 seq_printf(m, ",port=%u", nfss->port); 673 674 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 675 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 676 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 677 678 if (version != 4) 679 nfs_show_mountd_options(m, nfss, showdefaults); 680 else 681 nfs_show_nfsv4_options(m, nfss, showdefaults); 682 683 if (nfss->options & NFS_OPTION_FSCACHE) 684 seq_printf(m, ",fsc"); 685 686 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 688 seq_printf(m, ",lookupcache=none"); 689 else 690 seq_printf(m, ",lookupcache=pos"); 691 } 692 693 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 694 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 695 696 if (!local_flock && !local_fcntl) 697 seq_printf(m, ",local_lock=none"); 698 else if (local_flock && local_fcntl) 699 seq_printf(m, ",local_lock=all"); 700 else if (local_flock) 701 seq_printf(m, ",local_lock=flock"); 702 else 703 seq_printf(m, ",local_lock=posix"); 704 } 705 706 /* 707 * Describe the mount options on this VFS mountpoint 708 */ 709 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 710 { 711 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 712 713 nfs_show_mount_options(m, nfss, 0); 714 715 seq_printf(m, ",addr=%s", 716 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 717 RPC_DISPLAY_ADDR)); 718 719 return 0; 720 } 721 722 /* 723 * Present statistical information for this VFS mountpoint 724 */ 725 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 726 { 727 int i, cpu; 728 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 729 struct rpc_auth *auth = nfss->client->cl_auth; 730 struct nfs_iostats totals = { }; 731 732 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 733 734 /* 735 * Display all mount option settings 736 */ 737 seq_printf(m, "\n\topts:\t"); 738 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 739 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 740 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 741 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 742 nfs_show_mount_options(m, nfss, 1); 743 744 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 745 746 seq_printf(m, "\n\tcaps:\t"); 747 seq_printf(m, "caps=0x%x", nfss->caps); 748 seq_printf(m, ",wtmult=%u", nfss->wtmult); 749 seq_printf(m, ",dtsize=%u", nfss->dtsize); 750 seq_printf(m, ",bsize=%u", nfss->bsize); 751 seq_printf(m, ",namlen=%u", nfss->namelen); 752 753 #ifdef CONFIG_NFS_V4 754 if (nfss->nfs_client->rpc_ops->version == 4) { 755 seq_printf(m, "\n\tnfsv4:\t"); 756 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 757 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 758 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 759 } 760 #endif 761 762 /* 763 * Display security flavor in effect for this mount 764 */ 765 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 766 if (auth->au_flavor) 767 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 768 769 /* 770 * Display superblock I/O counters 771 */ 772 for_each_possible_cpu(cpu) { 773 struct nfs_iostats *stats; 774 775 preempt_disable(); 776 stats = per_cpu_ptr(nfss->io_stats, cpu); 777 778 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 779 totals.events[i] += stats->events[i]; 780 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 781 totals.bytes[i] += stats->bytes[i]; 782 #ifdef CONFIG_NFS_FSCACHE 783 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 784 totals.fscache[i] += stats->fscache[i]; 785 #endif 786 787 preempt_enable(); 788 } 789 790 seq_printf(m, "\n\tevents:\t"); 791 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 792 seq_printf(m, "%lu ", totals.events[i]); 793 seq_printf(m, "\n\tbytes:\t"); 794 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 795 seq_printf(m, "%Lu ", totals.bytes[i]); 796 #ifdef CONFIG_NFS_FSCACHE 797 if (nfss->options & NFS_OPTION_FSCACHE) { 798 seq_printf(m, "\n\tfsc:\t"); 799 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 800 seq_printf(m, "%Lu ", totals.bytes[i]); 801 } 802 #endif 803 seq_printf(m, "\n"); 804 805 rpc_print_iostats(m, nfss->client); 806 807 return 0; 808 } 809 810 /* 811 * Begin unmount by attempting to remove all automounted mountpoints we added 812 * in response to xdev traversals and referrals 813 */ 814 static void nfs_umount_begin(struct super_block *sb) 815 { 816 struct nfs_server *server; 817 struct rpc_clnt *rpc; 818 819 server = NFS_SB(sb); 820 /* -EIO all pending I/O */ 821 rpc = server->client_acl; 822 if (!IS_ERR(rpc)) 823 rpc_killall_tasks(rpc); 824 rpc = server->client; 825 if (!IS_ERR(rpc)) 826 rpc_killall_tasks(rpc); 827 } 828 829 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 830 { 831 struct nfs_parsed_mount_data *data; 832 833 data = kzalloc(sizeof(*data), GFP_KERNEL); 834 if (data) { 835 data->acregmin = NFS_DEF_ACREGMIN; 836 data->acregmax = NFS_DEF_ACREGMAX; 837 data->acdirmin = NFS_DEF_ACDIRMIN; 838 data->acdirmax = NFS_DEF_ACDIRMAX; 839 data->mount_server.port = NFS_UNSPEC_PORT; 840 data->nfs_server.port = NFS_UNSPEC_PORT; 841 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 842 data->auth_flavors[0] = RPC_AUTH_UNIX; 843 data->auth_flavor_len = 1; 844 data->version = version; 845 data->minorversion = 0; 846 } 847 return data; 848 } 849 850 /* 851 * Sanity-check a server address provided by the mount command. 852 * 853 * Address family must be initialized, and address must not be 854 * the ANY address for that family. 855 */ 856 static int nfs_verify_server_address(struct sockaddr *addr) 857 { 858 switch (addr->sa_family) { 859 case AF_INET: { 860 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 861 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 862 } 863 case AF_INET6: { 864 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 865 return !ipv6_addr_any(sa); 866 } 867 } 868 869 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 870 return 0; 871 } 872 873 /* 874 * Select between a default port value and a user-specified port value. 875 * If a zero value is set, then autobind will be used. 876 */ 877 static void nfs_set_port(struct sockaddr *sap, int *port, 878 const unsigned short default_port) 879 { 880 if (*port == NFS_UNSPEC_PORT) 881 *port = default_port; 882 883 rpc_set_port(sap, *port); 884 } 885 886 /* 887 * Sanity check the NFS transport protocol. 888 * 889 */ 890 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 891 { 892 switch (mnt->nfs_server.protocol) { 893 case XPRT_TRANSPORT_UDP: 894 case XPRT_TRANSPORT_TCP: 895 case XPRT_TRANSPORT_RDMA: 896 break; 897 default: 898 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 899 } 900 } 901 902 /* 903 * For text based NFSv2/v3 mounts, the mount protocol transport default 904 * settings should depend upon the specified NFS transport. 905 */ 906 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 907 { 908 nfs_validate_transport_protocol(mnt); 909 910 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 911 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 912 return; 913 switch (mnt->nfs_server.protocol) { 914 case XPRT_TRANSPORT_UDP: 915 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 916 break; 917 case XPRT_TRANSPORT_TCP: 918 case XPRT_TRANSPORT_RDMA: 919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 920 } 921 } 922 923 /* 924 * Parse the value of the 'sec=' option. 925 */ 926 static int nfs_parse_security_flavors(char *value, 927 struct nfs_parsed_mount_data *mnt) 928 { 929 substring_t args[MAX_OPT_ARGS]; 930 931 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 932 933 switch (match_token(value, nfs_secflavor_tokens, args)) { 934 case Opt_sec_none: 935 mnt->auth_flavors[0] = RPC_AUTH_NULL; 936 break; 937 case Opt_sec_sys: 938 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 939 break; 940 case Opt_sec_krb5: 941 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 942 break; 943 case Opt_sec_krb5i: 944 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 945 break; 946 case Opt_sec_krb5p: 947 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 948 break; 949 case Opt_sec_lkey: 950 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 951 break; 952 case Opt_sec_lkeyi: 953 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 954 break; 955 case Opt_sec_lkeyp: 956 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 957 break; 958 case Opt_sec_spkm: 959 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 960 break; 961 case Opt_sec_spkmi: 962 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 963 break; 964 case Opt_sec_spkmp: 965 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 966 break; 967 default: 968 return 0; 969 } 970 971 mnt->auth_flavor_len = 1; 972 return 1; 973 } 974 975 /* 976 * Error-check and convert a string of mount options from user space into 977 * a data structure. The whole mount string is processed; bad options are 978 * skipped as they are encountered. If there were no errors, return 1; 979 * otherwise return 0 (zero). 980 */ 981 static int nfs_parse_mount_options(char *raw, 982 struct nfs_parsed_mount_data *mnt) 983 { 984 char *p, *string, *secdata; 985 int rc, sloppy = 0, invalid_option = 0; 986 unsigned short protofamily = AF_UNSPEC; 987 unsigned short mountfamily = AF_UNSPEC; 988 989 if (!raw) { 990 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 991 return 1; 992 } 993 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 994 995 secdata = alloc_secdata(); 996 if (!secdata) 997 goto out_nomem; 998 999 rc = security_sb_copy_data(raw, secdata); 1000 if (rc) 1001 goto out_security_failure; 1002 1003 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1004 if (rc) 1005 goto out_security_failure; 1006 1007 free_secdata(secdata); 1008 1009 while ((p = strsep(&raw, ",")) != NULL) { 1010 substring_t args[MAX_OPT_ARGS]; 1011 unsigned long option; 1012 int token; 1013 1014 if (!*p) 1015 continue; 1016 1017 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1018 1019 token = match_token(p, nfs_mount_option_tokens, args); 1020 switch (token) { 1021 1022 /* 1023 * boolean options: foo/nofoo 1024 */ 1025 case Opt_soft: 1026 mnt->flags |= NFS_MOUNT_SOFT; 1027 break; 1028 case Opt_hard: 1029 mnt->flags &= ~NFS_MOUNT_SOFT; 1030 break; 1031 case Opt_posix: 1032 mnt->flags |= NFS_MOUNT_POSIX; 1033 break; 1034 case Opt_noposix: 1035 mnt->flags &= ~NFS_MOUNT_POSIX; 1036 break; 1037 case Opt_cto: 1038 mnt->flags &= ~NFS_MOUNT_NOCTO; 1039 break; 1040 case Opt_nocto: 1041 mnt->flags |= NFS_MOUNT_NOCTO; 1042 break; 1043 case Opt_ac: 1044 mnt->flags &= ~NFS_MOUNT_NOAC; 1045 break; 1046 case Opt_noac: 1047 mnt->flags |= NFS_MOUNT_NOAC; 1048 break; 1049 case Opt_lock: 1050 mnt->flags &= ~NFS_MOUNT_NONLM; 1051 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1052 NFS_MOUNT_LOCAL_FCNTL); 1053 break; 1054 case Opt_nolock: 1055 mnt->flags |= NFS_MOUNT_NONLM; 1056 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1057 NFS_MOUNT_LOCAL_FCNTL); 1058 break; 1059 case Opt_v2: 1060 mnt->flags &= ~NFS_MOUNT_VER3; 1061 mnt->version = 2; 1062 break; 1063 case Opt_v3: 1064 mnt->flags |= NFS_MOUNT_VER3; 1065 mnt->version = 3; 1066 break; 1067 #ifdef CONFIG_NFS_V4 1068 case Opt_v4: 1069 mnt->flags &= ~NFS_MOUNT_VER3; 1070 mnt->version = 4; 1071 break; 1072 #endif 1073 case Opt_udp: 1074 mnt->flags &= ~NFS_MOUNT_TCP; 1075 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1076 break; 1077 case Opt_tcp: 1078 mnt->flags |= NFS_MOUNT_TCP; 1079 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1080 break; 1081 case Opt_rdma: 1082 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1083 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1084 xprt_load_transport(p); 1085 break; 1086 case Opt_acl: 1087 mnt->flags &= ~NFS_MOUNT_NOACL; 1088 break; 1089 case Opt_noacl: 1090 mnt->flags |= NFS_MOUNT_NOACL; 1091 break; 1092 case Opt_rdirplus: 1093 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1094 break; 1095 case Opt_nordirplus: 1096 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1097 break; 1098 case Opt_sharecache: 1099 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1100 break; 1101 case Opt_nosharecache: 1102 mnt->flags |= NFS_MOUNT_UNSHARED; 1103 break; 1104 case Opt_resvport: 1105 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1106 break; 1107 case Opt_noresvport: 1108 mnt->flags |= NFS_MOUNT_NORESVPORT; 1109 break; 1110 case Opt_fscache: 1111 mnt->options |= NFS_OPTION_FSCACHE; 1112 kfree(mnt->fscache_uniq); 1113 mnt->fscache_uniq = NULL; 1114 break; 1115 case Opt_nofscache: 1116 mnt->options &= ~NFS_OPTION_FSCACHE; 1117 kfree(mnt->fscache_uniq); 1118 mnt->fscache_uniq = NULL; 1119 break; 1120 1121 /* 1122 * options that take numeric values 1123 */ 1124 case Opt_port: 1125 string = match_strdup(args); 1126 if (string == NULL) 1127 goto out_nomem; 1128 rc = strict_strtoul(string, 10, &option); 1129 kfree(string); 1130 if (rc != 0 || option > USHRT_MAX) 1131 goto out_invalid_value; 1132 mnt->nfs_server.port = option; 1133 break; 1134 case Opt_rsize: 1135 string = match_strdup(args); 1136 if (string == NULL) 1137 goto out_nomem; 1138 rc = strict_strtoul(string, 10, &option); 1139 kfree(string); 1140 if (rc != 0) 1141 goto out_invalid_value; 1142 mnt->rsize = option; 1143 break; 1144 case Opt_wsize: 1145 string = match_strdup(args); 1146 if (string == NULL) 1147 goto out_nomem; 1148 rc = strict_strtoul(string, 10, &option); 1149 kfree(string); 1150 if (rc != 0) 1151 goto out_invalid_value; 1152 mnt->wsize = option; 1153 break; 1154 case Opt_bsize: 1155 string = match_strdup(args); 1156 if (string == NULL) 1157 goto out_nomem; 1158 rc = strict_strtoul(string, 10, &option); 1159 kfree(string); 1160 if (rc != 0) 1161 goto out_invalid_value; 1162 mnt->bsize = option; 1163 break; 1164 case Opt_timeo: 1165 string = match_strdup(args); 1166 if (string == NULL) 1167 goto out_nomem; 1168 rc = strict_strtoul(string, 10, &option); 1169 kfree(string); 1170 if (rc != 0 || option == 0) 1171 goto out_invalid_value; 1172 mnt->timeo = option; 1173 break; 1174 case Opt_retrans: 1175 string = match_strdup(args); 1176 if (string == NULL) 1177 goto out_nomem; 1178 rc = strict_strtoul(string, 10, &option); 1179 kfree(string); 1180 if (rc != 0 || option == 0) 1181 goto out_invalid_value; 1182 mnt->retrans = option; 1183 break; 1184 case Opt_acregmin: 1185 string = match_strdup(args); 1186 if (string == NULL) 1187 goto out_nomem; 1188 rc = strict_strtoul(string, 10, &option); 1189 kfree(string); 1190 if (rc != 0) 1191 goto out_invalid_value; 1192 mnt->acregmin = option; 1193 break; 1194 case Opt_acregmax: 1195 string = match_strdup(args); 1196 if (string == NULL) 1197 goto out_nomem; 1198 rc = strict_strtoul(string, 10, &option); 1199 kfree(string); 1200 if (rc != 0) 1201 goto out_invalid_value; 1202 mnt->acregmax = option; 1203 break; 1204 case Opt_acdirmin: 1205 string = match_strdup(args); 1206 if (string == NULL) 1207 goto out_nomem; 1208 rc = strict_strtoul(string, 10, &option); 1209 kfree(string); 1210 if (rc != 0) 1211 goto out_invalid_value; 1212 mnt->acdirmin = option; 1213 break; 1214 case Opt_acdirmax: 1215 string = match_strdup(args); 1216 if (string == NULL) 1217 goto out_nomem; 1218 rc = strict_strtoul(string, 10, &option); 1219 kfree(string); 1220 if (rc != 0) 1221 goto out_invalid_value; 1222 mnt->acdirmax = option; 1223 break; 1224 case Opt_actimeo: 1225 string = match_strdup(args); 1226 if (string == NULL) 1227 goto out_nomem; 1228 rc = strict_strtoul(string, 10, &option); 1229 kfree(string); 1230 if (rc != 0) 1231 goto out_invalid_value; 1232 mnt->acregmin = mnt->acregmax = 1233 mnt->acdirmin = mnt->acdirmax = option; 1234 break; 1235 case Opt_namelen: 1236 string = match_strdup(args); 1237 if (string == NULL) 1238 goto out_nomem; 1239 rc = strict_strtoul(string, 10, &option); 1240 kfree(string); 1241 if (rc != 0) 1242 goto out_invalid_value; 1243 mnt->namlen = option; 1244 break; 1245 case Opt_mountport: 1246 string = match_strdup(args); 1247 if (string == NULL) 1248 goto out_nomem; 1249 rc = strict_strtoul(string, 10, &option); 1250 kfree(string); 1251 if (rc != 0 || option > USHRT_MAX) 1252 goto out_invalid_value; 1253 mnt->mount_server.port = option; 1254 break; 1255 case Opt_mountvers: 1256 string = match_strdup(args); 1257 if (string == NULL) 1258 goto out_nomem; 1259 rc = strict_strtoul(string, 10, &option); 1260 kfree(string); 1261 if (rc != 0 || 1262 option < NFS_MNT_VERSION || 1263 option > NFS_MNT3_VERSION) 1264 goto out_invalid_value; 1265 mnt->mount_server.version = option; 1266 break; 1267 case Opt_nfsvers: 1268 string = match_strdup(args); 1269 if (string == NULL) 1270 goto out_nomem; 1271 rc = strict_strtoul(string, 10, &option); 1272 kfree(string); 1273 if (rc != 0) 1274 goto out_invalid_value; 1275 switch (option) { 1276 case NFS2_VERSION: 1277 mnt->flags &= ~NFS_MOUNT_VER3; 1278 mnt->version = 2; 1279 break; 1280 case NFS3_VERSION: 1281 mnt->flags |= NFS_MOUNT_VER3; 1282 mnt->version = 3; 1283 break; 1284 #ifdef CONFIG_NFS_V4 1285 case NFS4_VERSION: 1286 mnt->flags &= ~NFS_MOUNT_VER3; 1287 mnt->version = 4; 1288 break; 1289 #endif 1290 default: 1291 goto out_invalid_value; 1292 } 1293 break; 1294 case Opt_minorversion: 1295 string = match_strdup(args); 1296 if (string == NULL) 1297 goto out_nomem; 1298 rc = strict_strtoul(string, 10, &option); 1299 kfree(string); 1300 if (rc != 0) 1301 goto out_invalid_value; 1302 if (option > NFS4_MAX_MINOR_VERSION) 1303 goto out_invalid_value; 1304 mnt->minorversion = option; 1305 break; 1306 1307 /* 1308 * options that take text values 1309 */ 1310 case Opt_sec: 1311 string = match_strdup(args); 1312 if (string == NULL) 1313 goto out_nomem; 1314 rc = nfs_parse_security_flavors(string, mnt); 1315 kfree(string); 1316 if (!rc) { 1317 dfprintk(MOUNT, "NFS: unrecognized " 1318 "security flavor\n"); 1319 return 0; 1320 } 1321 break; 1322 case Opt_proto: 1323 string = match_strdup(args); 1324 if (string == NULL) 1325 goto out_nomem; 1326 token = match_token(string, 1327 nfs_xprt_protocol_tokens, args); 1328 1329 protofamily = AF_INET; 1330 switch (token) { 1331 case Opt_xprt_udp6: 1332 protofamily = AF_INET6; 1333 case Opt_xprt_udp: 1334 mnt->flags &= ~NFS_MOUNT_TCP; 1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1336 kfree(string); 1337 break; 1338 case Opt_xprt_tcp6: 1339 protofamily = AF_INET6; 1340 case Opt_xprt_tcp: 1341 mnt->flags |= NFS_MOUNT_TCP; 1342 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1343 kfree(string); 1344 break; 1345 case Opt_xprt_rdma: 1346 /* vector side protocols to TCP */ 1347 mnt->flags |= NFS_MOUNT_TCP; 1348 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1349 xprt_load_transport(string); 1350 kfree(string); 1351 break; 1352 default: 1353 dfprintk(MOUNT, "NFS: unrecognized " 1354 "transport protocol\n"); 1355 kfree(string); 1356 return 0; 1357 } 1358 break; 1359 case Opt_mountproto: 1360 string = match_strdup(args); 1361 if (string == NULL) 1362 goto out_nomem; 1363 token = match_token(string, 1364 nfs_xprt_protocol_tokens, args); 1365 kfree(string); 1366 1367 mountfamily = AF_INET; 1368 switch (token) { 1369 case Opt_xprt_udp6: 1370 mountfamily = AF_INET6; 1371 case Opt_xprt_udp: 1372 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1373 break; 1374 case Opt_xprt_tcp6: 1375 mountfamily = AF_INET6; 1376 case Opt_xprt_tcp: 1377 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1378 break; 1379 case Opt_xprt_rdma: /* not used for side protocols */ 1380 default: 1381 dfprintk(MOUNT, "NFS: unrecognized " 1382 "transport protocol\n"); 1383 return 0; 1384 } 1385 break; 1386 case Opt_addr: 1387 string = match_strdup(args); 1388 if (string == NULL) 1389 goto out_nomem; 1390 mnt->nfs_server.addrlen = 1391 rpc_pton(string, strlen(string), 1392 (struct sockaddr *) 1393 &mnt->nfs_server.address, 1394 sizeof(mnt->nfs_server.address)); 1395 kfree(string); 1396 if (mnt->nfs_server.addrlen == 0) 1397 goto out_invalid_address; 1398 break; 1399 case Opt_clientaddr: 1400 string = match_strdup(args); 1401 if (string == NULL) 1402 goto out_nomem; 1403 kfree(mnt->client_address); 1404 mnt->client_address = string; 1405 break; 1406 case Opt_mounthost: 1407 string = match_strdup(args); 1408 if (string == NULL) 1409 goto out_nomem; 1410 kfree(mnt->mount_server.hostname); 1411 mnt->mount_server.hostname = string; 1412 break; 1413 case Opt_mountaddr: 1414 string = match_strdup(args); 1415 if (string == NULL) 1416 goto out_nomem; 1417 mnt->mount_server.addrlen = 1418 rpc_pton(string, strlen(string), 1419 (struct sockaddr *) 1420 &mnt->mount_server.address, 1421 sizeof(mnt->mount_server.address)); 1422 kfree(string); 1423 if (mnt->mount_server.addrlen == 0) 1424 goto out_invalid_address; 1425 break; 1426 case Opt_lookupcache: 1427 string = match_strdup(args); 1428 if (string == NULL) 1429 goto out_nomem; 1430 token = match_token(string, 1431 nfs_lookupcache_tokens, args); 1432 kfree(string); 1433 switch (token) { 1434 case Opt_lookupcache_all: 1435 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1436 break; 1437 case Opt_lookupcache_positive: 1438 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1439 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1440 break; 1441 case Opt_lookupcache_none: 1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1443 break; 1444 default: 1445 dfprintk(MOUNT, "NFS: invalid " 1446 "lookupcache argument\n"); 1447 return 0; 1448 }; 1449 break; 1450 case Opt_fscache_uniq: 1451 string = match_strdup(args); 1452 if (string == NULL) 1453 goto out_nomem; 1454 kfree(mnt->fscache_uniq); 1455 mnt->fscache_uniq = string; 1456 mnt->options |= NFS_OPTION_FSCACHE; 1457 break; 1458 case Opt_local_lock: 1459 string = match_strdup(args); 1460 if (string == NULL) 1461 goto out_nomem; 1462 token = match_token(string, nfs_local_lock_tokens, 1463 args); 1464 kfree(string); 1465 switch (token) { 1466 case Opt_local_lock_all: 1467 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1468 NFS_MOUNT_LOCAL_FCNTL); 1469 break; 1470 case Opt_local_lock_flock: 1471 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1472 break; 1473 case Opt_local_lock_posix: 1474 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1475 break; 1476 case Opt_local_lock_none: 1477 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1478 NFS_MOUNT_LOCAL_FCNTL); 1479 break; 1480 default: 1481 dfprintk(MOUNT, "NFS: invalid " 1482 "local_lock argument\n"); 1483 return 0; 1484 }; 1485 break; 1486 1487 /* 1488 * Special options 1489 */ 1490 case Opt_sloppy: 1491 sloppy = 1; 1492 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1493 break; 1494 case Opt_userspace: 1495 case Opt_deprecated: 1496 dfprintk(MOUNT, "NFS: ignoring mount option " 1497 "'%s'\n", p); 1498 break; 1499 1500 default: 1501 invalid_option = 1; 1502 dfprintk(MOUNT, "NFS: unrecognized mount option " 1503 "'%s'\n", p); 1504 } 1505 } 1506 1507 if (!sloppy && invalid_option) 1508 return 0; 1509 1510 /* 1511 * verify that any proto=/mountproto= options match the address 1512 * familiies in the addr=/mountaddr= options. 1513 */ 1514 if (protofamily != AF_UNSPEC && 1515 protofamily != mnt->nfs_server.address.ss_family) 1516 goto out_proto_mismatch; 1517 1518 if (mountfamily != AF_UNSPEC) { 1519 if (mnt->mount_server.addrlen) { 1520 if (mountfamily != mnt->mount_server.address.ss_family) 1521 goto out_mountproto_mismatch; 1522 } else { 1523 if (mountfamily != mnt->nfs_server.address.ss_family) 1524 goto out_mountproto_mismatch; 1525 } 1526 } 1527 1528 return 1; 1529 1530 out_mountproto_mismatch: 1531 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1532 "option\n"); 1533 return 0; 1534 out_proto_mismatch: 1535 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1536 return 0; 1537 out_invalid_address: 1538 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1539 return 0; 1540 out_invalid_value: 1541 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1542 return 0; 1543 out_nomem: 1544 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1545 return 0; 1546 out_security_failure: 1547 free_secdata(secdata); 1548 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1549 return 0; 1550 } 1551 1552 /* 1553 * Match the requested auth flavors with the list returned by 1554 * the server. Returns zero and sets the mount's authentication 1555 * flavor on success; returns -EACCES if server does not support 1556 * the requested flavor. 1557 */ 1558 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1559 struct nfs_mount_request *request) 1560 { 1561 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1562 1563 /* 1564 * Certain releases of Linux's mountd return an empty 1565 * flavor list. To prevent behavioral regression with 1566 * these servers (ie. rejecting mounts that used to 1567 * succeed), revert to pre-2.6.32 behavior (no checking) 1568 * if the returned flavor list is empty. 1569 */ 1570 if (server_authlist_len == 0) 1571 return 0; 1572 1573 /* 1574 * We avoid sophisticated negotiating here, as there are 1575 * plenty of cases where we can get it wrong, providing 1576 * either too little or too much security. 1577 * 1578 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1579 * flavor listed first. However, some servers list 1580 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1581 * preferred default, in args->auth_flavors[0] if user 1582 * didn't specify sec= mount option. 1583 */ 1584 for (i = 0; i < args->auth_flavor_len; i++) 1585 for (j = 0; j < server_authlist_len; j++) 1586 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1587 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1588 request->auth_flavs[j]); 1589 args->auth_flavors[0] = request->auth_flavs[j]; 1590 return 0; 1591 } 1592 1593 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1594 nfs_umount(request); 1595 return -EACCES; 1596 } 1597 1598 /* 1599 * Use the remote server's MOUNT service to request the NFS file handle 1600 * corresponding to the provided path. 1601 */ 1602 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1603 struct nfs_fh *root_fh) 1604 { 1605 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1606 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1607 struct nfs_mount_request request = { 1608 .sap = (struct sockaddr *) 1609 &args->mount_server.address, 1610 .dirpath = args->nfs_server.export_path, 1611 .protocol = args->mount_server.protocol, 1612 .fh = root_fh, 1613 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1614 .auth_flav_len = &server_authlist_len, 1615 .auth_flavs = server_authlist, 1616 }; 1617 int status; 1618 1619 if (args->mount_server.version == 0) { 1620 switch (args->version) { 1621 default: 1622 args->mount_server.version = NFS_MNT3_VERSION; 1623 break; 1624 case 2: 1625 args->mount_server.version = NFS_MNT_VERSION; 1626 } 1627 } 1628 request.version = args->mount_server.version; 1629 1630 if (args->mount_server.hostname) 1631 request.hostname = args->mount_server.hostname; 1632 else 1633 request.hostname = args->nfs_server.hostname; 1634 1635 /* 1636 * Construct the mount server's address. 1637 */ 1638 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1639 memcpy(request.sap, &args->nfs_server.address, 1640 args->nfs_server.addrlen); 1641 args->mount_server.addrlen = args->nfs_server.addrlen; 1642 } 1643 request.salen = args->mount_server.addrlen; 1644 nfs_set_port(request.sap, &args->mount_server.port, 0); 1645 1646 /* 1647 * Now ask the mount server to map our export path 1648 * to a file handle. 1649 */ 1650 status = nfs_mount(&request); 1651 if (status != 0) { 1652 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1653 request.hostname, status); 1654 return status; 1655 } 1656 1657 /* 1658 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1659 */ 1660 if (args->mount_server.version != NFS_MNT3_VERSION) 1661 return 0; 1662 return nfs_walk_authlist(args, &request); 1663 } 1664 1665 static int nfs_parse_simple_hostname(const char *dev_name, 1666 char **hostname, size_t maxnamlen, 1667 char **export_path, size_t maxpathlen) 1668 { 1669 size_t len; 1670 char *colon, *comma; 1671 1672 colon = strchr(dev_name, ':'); 1673 if (colon == NULL) 1674 goto out_bad_devname; 1675 1676 len = colon - dev_name; 1677 if (len > maxnamlen) 1678 goto out_hostname; 1679 1680 /* N.B. caller will free nfs_server.hostname in all cases */ 1681 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1682 if (!*hostname) 1683 goto out_nomem; 1684 1685 /* kill possible hostname list: not supported */ 1686 comma = strchr(*hostname, ','); 1687 if (comma != NULL) { 1688 if (comma == *hostname) 1689 goto out_bad_devname; 1690 *comma = '\0'; 1691 } 1692 1693 colon++; 1694 len = strlen(colon); 1695 if (len > maxpathlen) 1696 goto out_path; 1697 *export_path = kstrndup(colon, len, GFP_KERNEL); 1698 if (!*export_path) 1699 goto out_nomem; 1700 1701 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1702 return 0; 1703 1704 out_bad_devname: 1705 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1706 return -EINVAL; 1707 1708 out_nomem: 1709 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1710 return -ENOMEM; 1711 1712 out_hostname: 1713 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1714 return -ENAMETOOLONG; 1715 1716 out_path: 1717 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1718 return -ENAMETOOLONG; 1719 } 1720 1721 /* 1722 * Hostname has square brackets around it because it contains one or 1723 * more colons. We look for the first closing square bracket, and a 1724 * colon must follow it. 1725 */ 1726 static int nfs_parse_protected_hostname(const char *dev_name, 1727 char **hostname, size_t maxnamlen, 1728 char **export_path, size_t maxpathlen) 1729 { 1730 size_t len; 1731 char *start, *end; 1732 1733 start = (char *)(dev_name + 1); 1734 1735 end = strchr(start, ']'); 1736 if (end == NULL) 1737 goto out_bad_devname; 1738 if (*(end + 1) != ':') 1739 goto out_bad_devname; 1740 1741 len = end - start; 1742 if (len > maxnamlen) 1743 goto out_hostname; 1744 1745 /* N.B. caller will free nfs_server.hostname in all cases */ 1746 *hostname = kstrndup(start, len, GFP_KERNEL); 1747 if (*hostname == NULL) 1748 goto out_nomem; 1749 1750 end += 2; 1751 len = strlen(end); 1752 if (len > maxpathlen) 1753 goto out_path; 1754 *export_path = kstrndup(end, len, GFP_KERNEL); 1755 if (!*export_path) 1756 goto out_nomem; 1757 1758 return 0; 1759 1760 out_bad_devname: 1761 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1762 return -EINVAL; 1763 1764 out_nomem: 1765 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1766 return -ENOMEM; 1767 1768 out_hostname: 1769 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1770 return -ENAMETOOLONG; 1771 1772 out_path: 1773 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1774 return -ENAMETOOLONG; 1775 } 1776 1777 /* 1778 * Split "dev_name" into "hostname:export_path". 1779 * 1780 * The leftmost colon demarks the split between the server's hostname 1781 * and the export path. If the hostname starts with a left square 1782 * bracket, then it may contain colons. 1783 * 1784 * Note: caller frees hostname and export path, even on error. 1785 */ 1786 static int nfs_parse_devname(const char *dev_name, 1787 char **hostname, size_t maxnamlen, 1788 char **export_path, size_t maxpathlen) 1789 { 1790 if (*dev_name == '[') 1791 return nfs_parse_protected_hostname(dev_name, 1792 hostname, maxnamlen, 1793 export_path, maxpathlen); 1794 1795 return nfs_parse_simple_hostname(dev_name, 1796 hostname, maxnamlen, 1797 export_path, maxpathlen); 1798 } 1799 1800 /* 1801 * Validate the NFS2/NFS3 mount data 1802 * - fills in the mount root filehandle 1803 * 1804 * For option strings, user space handles the following behaviors: 1805 * 1806 * + DNS: mapping server host name to IP address ("addr=" option) 1807 * 1808 * + failure mode: how to behave if a mount request can't be handled 1809 * immediately ("fg/bg" option) 1810 * 1811 * + retry: how often to retry a mount request ("retry=" option) 1812 * 1813 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1814 * mountproto=tcp after mountproto=udp, and so on 1815 */ 1816 static int nfs_validate_mount_data(void *options, 1817 struct nfs_parsed_mount_data *args, 1818 struct nfs_fh *mntfh, 1819 const char *dev_name) 1820 { 1821 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1822 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1823 1824 if (data == NULL) 1825 goto out_no_data; 1826 1827 switch (data->version) { 1828 case 1: 1829 data->namlen = 0; 1830 case 2: 1831 data->bsize = 0; 1832 case 3: 1833 if (data->flags & NFS_MOUNT_VER3) 1834 goto out_no_v3; 1835 data->root.size = NFS2_FHSIZE; 1836 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1837 case 4: 1838 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1839 goto out_no_sec; 1840 case 5: 1841 memset(data->context, 0, sizeof(data->context)); 1842 case 6: 1843 if (data->flags & NFS_MOUNT_VER3) { 1844 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1845 goto out_invalid_fh; 1846 mntfh->size = data->root.size; 1847 args->version = 3; 1848 } else { 1849 mntfh->size = NFS2_FHSIZE; 1850 args->version = 2; 1851 } 1852 1853 1854 memcpy(mntfh->data, data->root.data, mntfh->size); 1855 if (mntfh->size < sizeof(mntfh->data)) 1856 memset(mntfh->data + mntfh->size, 0, 1857 sizeof(mntfh->data) - mntfh->size); 1858 1859 /* 1860 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1861 * can deal with. 1862 */ 1863 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1864 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1865 args->rsize = data->rsize; 1866 args->wsize = data->wsize; 1867 args->timeo = data->timeo; 1868 args->retrans = data->retrans; 1869 args->acregmin = data->acregmin; 1870 args->acregmax = data->acregmax; 1871 args->acdirmin = data->acdirmin; 1872 args->acdirmax = data->acdirmax; 1873 1874 memcpy(sap, &data->addr, sizeof(data->addr)); 1875 args->nfs_server.addrlen = sizeof(data->addr); 1876 if (!nfs_verify_server_address(sap)) 1877 goto out_no_address; 1878 1879 if (!(data->flags & NFS_MOUNT_TCP)) 1880 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1881 /* N.B. caller will free nfs_server.hostname in all cases */ 1882 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1883 args->namlen = data->namlen; 1884 args->bsize = data->bsize; 1885 1886 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1887 args->auth_flavors[0] = data->pseudoflavor; 1888 if (!args->nfs_server.hostname) 1889 goto out_nomem; 1890 1891 if (!(data->flags & NFS_MOUNT_NONLM)) 1892 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1893 NFS_MOUNT_LOCAL_FCNTL); 1894 else 1895 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1896 NFS_MOUNT_LOCAL_FCNTL); 1897 /* 1898 * The legacy version 6 binary mount data from userspace has a 1899 * field used only to transport selinux information into the 1900 * the kernel. To continue to support that functionality we 1901 * have a touch of selinux knowledge here in the NFS code. The 1902 * userspace code converted context=blah to just blah so we are 1903 * converting back to the full string selinux understands. 1904 */ 1905 if (data->context[0]){ 1906 #ifdef CONFIG_SECURITY_SELINUX 1907 int rc; 1908 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1909 if (!opts_str) 1910 return -ENOMEM; 1911 strcpy(opts_str, "context="); 1912 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1913 strcat(opts_str, &data->context[0]); 1914 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1915 kfree(opts_str); 1916 if (rc) 1917 return rc; 1918 #else 1919 return -EINVAL; 1920 #endif 1921 } 1922 1923 break; 1924 default: { 1925 int status; 1926 1927 if (nfs_parse_mount_options((char *)options, args) == 0) 1928 return -EINVAL; 1929 1930 if (!nfs_verify_server_address(sap)) 1931 goto out_no_address; 1932 1933 if (args->version == 4) 1934 #ifdef CONFIG_NFS_V4 1935 return nfs4_validate_text_mount_data(options, 1936 args, dev_name); 1937 #else 1938 goto out_v4_not_compiled; 1939 #endif 1940 1941 nfs_set_port(sap, &args->nfs_server.port, 0); 1942 1943 nfs_set_mount_transport_protocol(args); 1944 1945 status = nfs_parse_devname(dev_name, 1946 &args->nfs_server.hostname, 1947 PAGE_SIZE, 1948 &args->nfs_server.export_path, 1949 NFS_MAXPATHLEN); 1950 if (!status) 1951 status = nfs_try_mount(args, mntfh); 1952 1953 kfree(args->nfs_server.export_path); 1954 args->nfs_server.export_path = NULL; 1955 1956 if (status) 1957 return status; 1958 1959 break; 1960 } 1961 } 1962 1963 #ifndef CONFIG_NFS_V3 1964 if (args->version == 3) 1965 goto out_v3_not_compiled; 1966 #endif /* !CONFIG_NFS_V3 */ 1967 1968 return 0; 1969 1970 out_no_data: 1971 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1972 return -EINVAL; 1973 1974 out_no_v3: 1975 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1976 data->version); 1977 return -EINVAL; 1978 1979 out_no_sec: 1980 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1981 return -EINVAL; 1982 1983 #ifndef CONFIG_NFS_V3 1984 out_v3_not_compiled: 1985 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1986 return -EPROTONOSUPPORT; 1987 #endif /* !CONFIG_NFS_V3 */ 1988 1989 #ifndef CONFIG_NFS_V4 1990 out_v4_not_compiled: 1991 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1992 return -EPROTONOSUPPORT; 1993 #endif /* !CONFIG_NFS_V4 */ 1994 1995 out_nomem: 1996 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1997 return -ENOMEM; 1998 1999 out_no_address: 2000 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2001 return -EINVAL; 2002 2003 out_invalid_fh: 2004 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2005 return -EINVAL; 2006 } 2007 2008 static int 2009 nfs_compare_remount_data(struct nfs_server *nfss, 2010 struct nfs_parsed_mount_data *data) 2011 { 2012 if (data->flags != nfss->flags || 2013 data->rsize != nfss->rsize || 2014 data->wsize != nfss->wsize || 2015 data->retrans != nfss->client->cl_timeout->to_retries || 2016 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2017 data->acregmin != nfss->acregmin / HZ || 2018 data->acregmax != nfss->acregmax / HZ || 2019 data->acdirmin != nfss->acdirmin / HZ || 2020 data->acdirmax != nfss->acdirmax / HZ || 2021 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2022 data->nfs_server.port != nfss->port || 2023 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2024 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2025 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2026 return -EINVAL; 2027 2028 return 0; 2029 } 2030 2031 static int 2032 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2033 { 2034 int error; 2035 struct nfs_server *nfss = sb->s_fs_info; 2036 struct nfs_parsed_mount_data *data; 2037 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2038 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2039 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2040 2041 /* 2042 * Userspace mount programs that send binary options generally send 2043 * them populated with default values. We have no way to know which 2044 * ones were explicitly specified. Fall back to legacy behavior and 2045 * just return success. 2046 */ 2047 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2048 (nfsvers <= 3 && (!options || (options->version >= 1 && 2049 options->version <= 6)))) 2050 return 0; 2051 2052 data = kzalloc(sizeof(*data), GFP_KERNEL); 2053 if (data == NULL) 2054 return -ENOMEM; 2055 2056 /* fill out struct with values from existing mount */ 2057 data->flags = nfss->flags; 2058 data->rsize = nfss->rsize; 2059 data->wsize = nfss->wsize; 2060 data->retrans = nfss->client->cl_timeout->to_retries; 2061 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2062 data->acregmin = nfss->acregmin / HZ; 2063 data->acregmax = nfss->acregmax / HZ; 2064 data->acdirmin = nfss->acdirmin / HZ; 2065 data->acdirmax = nfss->acdirmax / HZ; 2066 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2067 data->nfs_server.port = nfss->port; 2068 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2069 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2070 data->nfs_server.addrlen); 2071 2072 /* overwrite those values with any that were specified */ 2073 error = nfs_parse_mount_options((char *)options, data); 2074 if (error < 0) 2075 goto out; 2076 2077 /* compare new mount options with old ones */ 2078 error = nfs_compare_remount_data(nfss, data); 2079 out: 2080 kfree(data); 2081 return error; 2082 } 2083 2084 /* 2085 * Initialise the common bits of the superblock 2086 */ 2087 static inline void nfs_initialise_sb(struct super_block *sb) 2088 { 2089 struct nfs_server *server = NFS_SB(sb); 2090 2091 sb->s_magic = NFS_SUPER_MAGIC; 2092 2093 /* We probably want something more informative here */ 2094 snprintf(sb->s_id, sizeof(sb->s_id), 2095 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2096 2097 if (sb->s_blocksize == 0) 2098 sb->s_blocksize = nfs_block_bits(server->wsize, 2099 &sb->s_blocksize_bits); 2100 2101 if (server->flags & NFS_MOUNT_NOAC) 2102 sb->s_flags |= MS_SYNCHRONOUS; 2103 2104 sb->s_bdi = &server->backing_dev_info; 2105 2106 nfs_super_set_maxbytes(sb, server->maxfilesize); 2107 } 2108 2109 /* 2110 * Finish setting up an NFS2/3 superblock 2111 */ 2112 static void nfs_fill_super(struct super_block *sb, 2113 struct nfs_parsed_mount_data *data) 2114 { 2115 struct nfs_server *server = NFS_SB(sb); 2116 2117 sb->s_blocksize_bits = 0; 2118 sb->s_blocksize = 0; 2119 if (data->bsize) 2120 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2121 2122 if (server->nfs_client->rpc_ops->version == 3) { 2123 /* The VFS shouldn't apply the umask to mode bits. We will do 2124 * so ourselves when necessary. 2125 */ 2126 sb->s_flags |= MS_POSIXACL; 2127 sb->s_time_gran = 1; 2128 } 2129 2130 sb->s_op = &nfs_sops; 2131 nfs_initialise_sb(sb); 2132 } 2133 2134 /* 2135 * Finish setting up a cloned NFS2/3 superblock 2136 */ 2137 static void nfs_clone_super(struct super_block *sb, 2138 const struct super_block *old_sb) 2139 { 2140 struct nfs_server *server = NFS_SB(sb); 2141 2142 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2143 sb->s_blocksize = old_sb->s_blocksize; 2144 sb->s_maxbytes = old_sb->s_maxbytes; 2145 2146 if (server->nfs_client->rpc_ops->version == 3) { 2147 /* The VFS shouldn't apply the umask to mode bits. We will do 2148 * so ourselves when necessary. 2149 */ 2150 sb->s_flags |= MS_POSIXACL; 2151 sb->s_time_gran = 1; 2152 } 2153 2154 sb->s_op = old_sb->s_op; 2155 nfs_initialise_sb(sb); 2156 } 2157 2158 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2159 { 2160 const struct nfs_server *a = s->s_fs_info; 2161 const struct rpc_clnt *clnt_a = a->client; 2162 const struct rpc_clnt *clnt_b = b->client; 2163 2164 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2165 goto Ebusy; 2166 if (a->nfs_client != b->nfs_client) 2167 goto Ebusy; 2168 if (a->flags != b->flags) 2169 goto Ebusy; 2170 if (a->wsize != b->wsize) 2171 goto Ebusy; 2172 if (a->rsize != b->rsize) 2173 goto Ebusy; 2174 if (a->acregmin != b->acregmin) 2175 goto Ebusy; 2176 if (a->acregmax != b->acregmax) 2177 goto Ebusy; 2178 if (a->acdirmin != b->acdirmin) 2179 goto Ebusy; 2180 if (a->acdirmax != b->acdirmax) 2181 goto Ebusy; 2182 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2183 goto Ebusy; 2184 return 1; 2185 Ebusy: 2186 return 0; 2187 } 2188 2189 struct nfs_sb_mountdata { 2190 struct nfs_server *server; 2191 int mntflags; 2192 }; 2193 2194 static int nfs_set_super(struct super_block *s, void *data) 2195 { 2196 struct nfs_sb_mountdata *sb_mntdata = data; 2197 struct nfs_server *server = sb_mntdata->server; 2198 int ret; 2199 2200 s->s_flags = sb_mntdata->mntflags; 2201 s->s_fs_info = server; 2202 ret = set_anon_super(s, server); 2203 if (ret == 0) 2204 server->s_dev = s->s_dev; 2205 return ret; 2206 } 2207 2208 static int nfs_compare_super_address(struct nfs_server *server1, 2209 struct nfs_server *server2) 2210 { 2211 struct sockaddr *sap1, *sap2; 2212 2213 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2214 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2215 2216 if (sap1->sa_family != sap2->sa_family) 2217 return 0; 2218 2219 switch (sap1->sa_family) { 2220 case AF_INET: { 2221 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2222 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2223 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2224 return 0; 2225 if (sin1->sin_port != sin2->sin_port) 2226 return 0; 2227 break; 2228 } 2229 case AF_INET6: { 2230 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2231 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2232 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2233 return 0; 2234 if (sin1->sin6_port != sin2->sin6_port) 2235 return 0; 2236 break; 2237 } 2238 default: 2239 return 0; 2240 } 2241 2242 return 1; 2243 } 2244 2245 static int nfs_compare_super(struct super_block *sb, void *data) 2246 { 2247 struct nfs_sb_mountdata *sb_mntdata = data; 2248 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2249 int mntflags = sb_mntdata->mntflags; 2250 2251 if (!nfs_compare_super_address(old, server)) 2252 return 0; 2253 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2254 if (old->flags & NFS_MOUNT_UNSHARED) 2255 return 0; 2256 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2257 return 0; 2258 return nfs_compare_mount_options(sb, server, mntflags); 2259 } 2260 2261 static int nfs_bdi_register(struct nfs_server *server) 2262 { 2263 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2264 } 2265 2266 static int nfs_get_sb(struct file_system_type *fs_type, 2267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2268 { 2269 struct nfs_server *server = NULL; 2270 struct super_block *s; 2271 struct nfs_parsed_mount_data *data; 2272 struct nfs_fh *mntfh; 2273 struct dentry *mntroot; 2274 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2275 struct nfs_sb_mountdata sb_mntdata = { 2276 .mntflags = flags, 2277 }; 2278 int error = -ENOMEM; 2279 2280 data = nfs_alloc_parsed_mount_data(3); 2281 mntfh = nfs_alloc_fhandle(); 2282 if (data == NULL || mntfh == NULL) 2283 goto out_free_fh; 2284 2285 security_init_mnt_opts(&data->lsm_opts); 2286 2287 /* Validate the mount data */ 2288 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2289 if (error < 0) 2290 goto out; 2291 2292 #ifdef CONFIG_NFS_V4 2293 if (data->version == 4) { 2294 error = nfs4_try_mount(flags, dev_name, data, mnt); 2295 kfree(data->client_address); 2296 kfree(data->nfs_server.export_path); 2297 goto out; 2298 } 2299 #endif /* CONFIG_NFS_V4 */ 2300 2301 /* Get a volume representation */ 2302 server = nfs_create_server(data, mntfh); 2303 if (IS_ERR(server)) { 2304 error = PTR_ERR(server); 2305 goto out; 2306 } 2307 sb_mntdata.server = server; 2308 2309 if (server->flags & NFS_MOUNT_UNSHARED) 2310 compare_super = NULL; 2311 2312 /* Get a superblock - note that we may end up sharing one that already exists */ 2313 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2314 if (IS_ERR(s)) { 2315 error = PTR_ERR(s); 2316 goto out_err_nosb; 2317 } 2318 2319 if (s->s_fs_info != server) { 2320 nfs_free_server(server); 2321 server = NULL; 2322 } else { 2323 error = nfs_bdi_register(server); 2324 if (error) 2325 goto error_splat_bdi; 2326 } 2327 2328 if (!s->s_root) { 2329 /* initial superblock/root creation */ 2330 nfs_fill_super(s, data); 2331 nfs_fscache_get_super_cookie( 2332 s, data ? data->fscache_uniq : NULL, NULL); 2333 } 2334 2335 mntroot = nfs_get_root(s, mntfh); 2336 if (IS_ERR(mntroot)) { 2337 error = PTR_ERR(mntroot); 2338 goto error_splat_super; 2339 } 2340 2341 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2342 if (error) 2343 goto error_splat_root; 2344 2345 s->s_flags |= MS_ACTIVE; 2346 mnt->mnt_sb = s; 2347 mnt->mnt_root = mntroot; 2348 error = 0; 2349 2350 out: 2351 kfree(data->nfs_server.hostname); 2352 kfree(data->mount_server.hostname); 2353 kfree(data->fscache_uniq); 2354 security_free_mnt_opts(&data->lsm_opts); 2355 out_free_fh: 2356 nfs_free_fhandle(mntfh); 2357 kfree(data); 2358 return error; 2359 2360 out_err_nosb: 2361 nfs_free_server(server); 2362 goto out; 2363 2364 error_splat_root: 2365 dput(mntroot); 2366 error_splat_super: 2367 if (server && !s->s_root) 2368 bdi_unregister(&server->backing_dev_info); 2369 error_splat_bdi: 2370 deactivate_locked_super(s); 2371 goto out; 2372 } 2373 2374 /* 2375 * Ensure that we unregister the bdi before kill_anon_super 2376 * releases the device name 2377 */ 2378 static void nfs_put_super(struct super_block *s) 2379 { 2380 struct nfs_server *server = NFS_SB(s); 2381 2382 bdi_unregister(&server->backing_dev_info); 2383 } 2384 2385 /* 2386 * Destroy an NFS2/3 superblock 2387 */ 2388 static void nfs_kill_super(struct super_block *s) 2389 { 2390 struct nfs_server *server = NFS_SB(s); 2391 2392 kill_anon_super(s); 2393 nfs_fscache_release_super_cookie(s); 2394 nfs_free_server(server); 2395 } 2396 2397 /* 2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2399 */ 2400 static struct dentry * 2401 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2402 const char *dev_name, void *raw_data) 2403 { 2404 struct nfs_clone_mount *data = raw_data; 2405 struct super_block *s; 2406 struct nfs_server *server; 2407 struct dentry *mntroot; 2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2409 struct nfs_sb_mountdata sb_mntdata = { 2410 .mntflags = flags, 2411 }; 2412 int error; 2413 2414 dprintk("--> nfs_xdev_mount()\n"); 2415 2416 /* create a new volume representation */ 2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2418 if (IS_ERR(server)) { 2419 error = PTR_ERR(server); 2420 goto out_err_noserver; 2421 } 2422 sb_mntdata.server = server; 2423 2424 if (server->flags & NFS_MOUNT_UNSHARED) 2425 compare_super = NULL; 2426 2427 /* Get a superblock - note that we may end up sharing one that already exists */ 2428 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2429 if (IS_ERR(s)) { 2430 error = PTR_ERR(s); 2431 goto out_err_nosb; 2432 } 2433 2434 if (s->s_fs_info != server) { 2435 nfs_free_server(server); 2436 server = NULL; 2437 } else { 2438 error = nfs_bdi_register(server); 2439 if (error) 2440 goto error_splat_bdi; 2441 } 2442 2443 if (!s->s_root) { 2444 /* initial superblock/root creation */ 2445 nfs_clone_super(s, data->sb); 2446 nfs_fscache_get_super_cookie(s, NULL, data); 2447 } 2448 2449 mntroot = nfs_get_root(s, data->fh); 2450 if (IS_ERR(mntroot)) { 2451 error = PTR_ERR(mntroot); 2452 goto error_splat_super; 2453 } 2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2455 dput(mntroot); 2456 error = -ESTALE; 2457 goto error_splat_super; 2458 } 2459 2460 s->s_flags |= MS_ACTIVE; 2461 2462 /* clone any lsm security options from the parent to the new sb */ 2463 security_sb_clone_mnt_opts(data->sb, s); 2464 2465 dprintk("<-- nfs_xdev_mount() = 0\n"); 2466 return mntroot; 2467 2468 out_err_nosb: 2469 nfs_free_server(server); 2470 out_err_noserver: 2471 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2472 return ERR_PTR(error); 2473 2474 error_splat_super: 2475 if (server && !s->s_root) 2476 bdi_unregister(&server->backing_dev_info); 2477 error_splat_bdi: 2478 deactivate_locked_super(s); 2479 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2480 return ERR_PTR(error); 2481 } 2482 2483 #ifdef CONFIG_NFS_V4 2484 2485 /* 2486 * Finish setting up a cloned NFS4 superblock 2487 */ 2488 static void nfs4_clone_super(struct super_block *sb, 2489 const struct super_block *old_sb) 2490 { 2491 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2492 sb->s_blocksize = old_sb->s_blocksize; 2493 sb->s_maxbytes = old_sb->s_maxbytes; 2494 sb->s_time_gran = 1; 2495 sb->s_op = old_sb->s_op; 2496 nfs_initialise_sb(sb); 2497 } 2498 2499 /* 2500 * Set up an NFS4 superblock 2501 */ 2502 static void nfs4_fill_super(struct super_block *sb) 2503 { 2504 sb->s_time_gran = 1; 2505 sb->s_op = &nfs4_sops; 2506 nfs_initialise_sb(sb); 2507 } 2508 2509 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2510 { 2511 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2512 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2513 } 2514 2515 static int nfs4_validate_text_mount_data(void *options, 2516 struct nfs_parsed_mount_data *args, 2517 const char *dev_name) 2518 { 2519 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2520 2521 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2522 2523 nfs_validate_transport_protocol(args); 2524 2525 nfs4_validate_mount_flags(args); 2526 2527 if (args->version != 4) { 2528 dfprintk(MOUNT, 2529 "NFS4: Illegal mount version\n"); 2530 return -EINVAL; 2531 } 2532 2533 if (args->auth_flavor_len > 1) { 2534 dfprintk(MOUNT, 2535 "NFS4: Too many RPC auth flavours specified\n"); 2536 return -EINVAL; 2537 } 2538 2539 if (args->client_address == NULL) { 2540 dfprintk(MOUNT, 2541 "NFS4: mount program didn't pass callback address\n"); 2542 return -EINVAL; 2543 } 2544 2545 return nfs_parse_devname(dev_name, 2546 &args->nfs_server.hostname, 2547 NFS4_MAXNAMLEN, 2548 &args->nfs_server.export_path, 2549 NFS4_MAXPATHLEN); 2550 } 2551 2552 /* 2553 * Validate NFSv4 mount options 2554 */ 2555 static int nfs4_validate_mount_data(void *options, 2556 struct nfs_parsed_mount_data *args, 2557 const char *dev_name) 2558 { 2559 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2560 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2561 char *c; 2562 2563 if (data == NULL) 2564 goto out_no_data; 2565 2566 switch (data->version) { 2567 case 1: 2568 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2569 goto out_no_address; 2570 if (data->host_addrlen == 0) 2571 goto out_no_address; 2572 args->nfs_server.addrlen = data->host_addrlen; 2573 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2574 return -EFAULT; 2575 if (!nfs_verify_server_address(sap)) 2576 goto out_no_address; 2577 2578 if (data->auth_flavourlen) { 2579 if (data->auth_flavourlen > 1) 2580 goto out_inval_auth; 2581 if (copy_from_user(&args->auth_flavors[0], 2582 data->auth_flavours, 2583 sizeof(args->auth_flavors[0]))) 2584 return -EFAULT; 2585 } 2586 2587 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2588 if (IS_ERR(c)) 2589 return PTR_ERR(c); 2590 args->nfs_server.hostname = c; 2591 2592 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2593 if (IS_ERR(c)) 2594 return PTR_ERR(c); 2595 args->nfs_server.export_path = c; 2596 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2597 2598 c = strndup_user(data->client_addr.data, 16); 2599 if (IS_ERR(c)) 2600 return PTR_ERR(c); 2601 args->client_address = c; 2602 2603 /* 2604 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2605 * can deal with. 2606 */ 2607 2608 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2609 args->rsize = data->rsize; 2610 args->wsize = data->wsize; 2611 args->timeo = data->timeo; 2612 args->retrans = data->retrans; 2613 args->acregmin = data->acregmin; 2614 args->acregmax = data->acregmax; 2615 args->acdirmin = data->acdirmin; 2616 args->acdirmax = data->acdirmax; 2617 args->nfs_server.protocol = data->proto; 2618 nfs_validate_transport_protocol(args); 2619 2620 break; 2621 default: 2622 if (nfs_parse_mount_options((char *)options, args) == 0) 2623 return -EINVAL; 2624 2625 if (!nfs_verify_server_address(sap)) 2626 return -EINVAL; 2627 2628 return nfs4_validate_text_mount_data(options, args, dev_name); 2629 } 2630 2631 return 0; 2632 2633 out_no_data: 2634 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2635 return -EINVAL; 2636 2637 out_inval_auth: 2638 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2639 data->auth_flavourlen); 2640 return -EINVAL; 2641 2642 out_no_address: 2643 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2644 return -EINVAL; 2645 } 2646 2647 /* 2648 * Get the superblock for the NFS4 root partition 2649 */ 2650 static struct dentry * 2651 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2652 const char *dev_name, void *raw_data) 2653 { 2654 struct nfs_parsed_mount_data *data = raw_data; 2655 struct super_block *s; 2656 struct nfs_server *server; 2657 struct nfs_fh *mntfh; 2658 struct dentry *mntroot; 2659 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2660 struct nfs_sb_mountdata sb_mntdata = { 2661 .mntflags = flags, 2662 }; 2663 int error = -ENOMEM; 2664 2665 mntfh = nfs_alloc_fhandle(); 2666 if (data == NULL || mntfh == NULL) 2667 goto out_free_fh; 2668 2669 security_init_mnt_opts(&data->lsm_opts); 2670 2671 /* Get a volume representation */ 2672 server = nfs4_create_server(data, mntfh); 2673 if (IS_ERR(server)) { 2674 error = PTR_ERR(server); 2675 goto out; 2676 } 2677 sb_mntdata.server = server; 2678 2679 if (server->flags & NFS4_MOUNT_UNSHARED) 2680 compare_super = NULL; 2681 2682 /* Get a superblock - note that we may end up sharing one that already exists */ 2683 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2684 if (IS_ERR(s)) { 2685 error = PTR_ERR(s); 2686 goto out_free; 2687 } 2688 2689 if (s->s_fs_info != server) { 2690 nfs_free_server(server); 2691 server = NULL; 2692 } else { 2693 error = nfs_bdi_register(server); 2694 if (error) 2695 goto error_splat_bdi; 2696 } 2697 2698 if (!s->s_root) { 2699 /* initial superblock/root creation */ 2700 nfs4_fill_super(s); 2701 nfs_fscache_get_super_cookie( 2702 s, data ? data->fscache_uniq : NULL, NULL); 2703 } 2704 2705 mntroot = nfs4_get_root(s, mntfh); 2706 if (IS_ERR(mntroot)) { 2707 error = PTR_ERR(mntroot); 2708 goto error_splat_super; 2709 } 2710 2711 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2712 if (error) 2713 goto error_splat_root; 2714 2715 s->s_flags |= MS_ACTIVE; 2716 2717 security_free_mnt_opts(&data->lsm_opts); 2718 nfs_free_fhandle(mntfh); 2719 return mntroot; 2720 2721 out: 2722 security_free_mnt_opts(&data->lsm_opts); 2723 out_free_fh: 2724 nfs_free_fhandle(mntfh); 2725 return ERR_PTR(error); 2726 2727 out_free: 2728 nfs_free_server(server); 2729 goto out; 2730 2731 error_splat_root: 2732 dput(mntroot); 2733 error_splat_super: 2734 if (server && !s->s_root) 2735 bdi_unregister(&server->backing_dev_info); 2736 error_splat_bdi: 2737 deactivate_locked_super(s); 2738 goto out; 2739 } 2740 2741 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2742 int flags, void *data, const char *hostname) 2743 { 2744 struct vfsmount *root_mnt; 2745 char *root_devname; 2746 size_t len; 2747 2748 len = strlen(hostname) + 3; 2749 root_devname = kmalloc(len, GFP_KERNEL); 2750 if (root_devname == NULL) 2751 return ERR_PTR(-ENOMEM); 2752 snprintf(root_devname, len, "%s:/", hostname); 2753 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2754 kfree(root_devname); 2755 return root_mnt; 2756 } 2757 2758 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2759 { 2760 char *page = (char *) __get_free_page(GFP_KERNEL); 2761 char *devname, *tmp; 2762 2763 if (page == NULL) 2764 return; 2765 devname = nfs_path(path->mnt->mnt_devname, 2766 path->mnt->mnt_root, path->dentry, 2767 page, PAGE_SIZE); 2768 if (IS_ERR(devname)) 2769 goto out_freepage; 2770 tmp = kstrdup(devname, GFP_KERNEL); 2771 if (tmp == NULL) 2772 goto out_freepage; 2773 kfree(mnt->mnt_devname); 2774 mnt->mnt_devname = tmp; 2775 out_freepage: 2776 free_page((unsigned long)page); 2777 } 2778 2779 struct nfs_referral_count { 2780 struct list_head list; 2781 const struct task_struct *task; 2782 unsigned int referral_count; 2783 }; 2784 2785 static LIST_HEAD(nfs_referral_count_list); 2786 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2787 2788 static struct nfs_referral_count *nfs_find_referral_count(void) 2789 { 2790 struct nfs_referral_count *p; 2791 2792 list_for_each_entry(p, &nfs_referral_count_list, list) { 2793 if (p->task == current) 2794 return p; 2795 } 2796 return NULL; 2797 } 2798 2799 #define NFS_MAX_NESTED_REFERRALS 2 2800 2801 static int nfs_referral_loop_protect(void) 2802 { 2803 struct nfs_referral_count *p, *new; 2804 int ret = -ENOMEM; 2805 2806 new = kmalloc(sizeof(*new), GFP_KERNEL); 2807 if (!new) 2808 goto out; 2809 new->task = current; 2810 new->referral_count = 1; 2811 2812 ret = 0; 2813 spin_lock(&nfs_referral_count_list_lock); 2814 p = nfs_find_referral_count(); 2815 if (p != NULL) { 2816 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2817 ret = -ELOOP; 2818 else 2819 p->referral_count++; 2820 } else { 2821 list_add(&new->list, &nfs_referral_count_list); 2822 new = NULL; 2823 } 2824 spin_unlock(&nfs_referral_count_list_lock); 2825 kfree(new); 2826 out: 2827 return ret; 2828 } 2829 2830 static void nfs_referral_loop_unprotect(void) 2831 { 2832 struct nfs_referral_count *p; 2833 2834 spin_lock(&nfs_referral_count_list_lock); 2835 p = nfs_find_referral_count(); 2836 p->referral_count--; 2837 if (p->referral_count == 0) 2838 list_del(&p->list); 2839 else 2840 p = NULL; 2841 spin_unlock(&nfs_referral_count_list_lock); 2842 kfree(p); 2843 } 2844 2845 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2846 const char *export_path, struct vfsmount *mnt_target) 2847 { 2848 struct nameidata *nd = NULL; 2849 struct mnt_namespace *ns_private; 2850 struct super_block *s; 2851 int ret; 2852 2853 nd = kmalloc(sizeof(*nd), GFP_KERNEL); 2854 if (nd == NULL) 2855 return -ENOMEM; 2856 2857 ns_private = create_mnt_ns(root_mnt); 2858 ret = PTR_ERR(ns_private); 2859 if (IS_ERR(ns_private)) 2860 goto out_mntput; 2861 2862 ret = nfs_referral_loop_protect(); 2863 if (ret != 0) 2864 goto out_put_mnt_ns; 2865 2866 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2867 export_path, LOOKUP_FOLLOW, nd); 2868 2869 nfs_referral_loop_unprotect(); 2870 put_mnt_ns(ns_private); 2871 2872 if (ret != 0) 2873 goto out_err; 2874 2875 s = nd->path.mnt->mnt_sb; 2876 atomic_inc(&s->s_active); 2877 mnt_target->mnt_sb = s; 2878 mnt_target->mnt_root = dget(nd->path.dentry); 2879 2880 /* Correct the device pathname */ 2881 nfs_fix_devname(&nd->path, mnt_target); 2882 2883 path_put(&nd->path); 2884 kfree(nd); 2885 down_write(&s->s_umount); 2886 return 0; 2887 out_put_mnt_ns: 2888 put_mnt_ns(ns_private); 2889 out_mntput: 2890 mntput(root_mnt); 2891 out_err: 2892 kfree(nd); 2893 return ret; 2894 } 2895 2896 static int nfs4_try_mount(int flags, const char *dev_name, 2897 struct nfs_parsed_mount_data *data, 2898 struct vfsmount *mnt) 2899 { 2900 char *export_path; 2901 struct vfsmount *root_mnt; 2902 int error; 2903 2904 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2905 2906 export_path = data->nfs_server.export_path; 2907 data->nfs_server.export_path = "/"; 2908 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2909 data->nfs_server.hostname); 2910 data->nfs_server.export_path = export_path; 2911 2912 error = PTR_ERR(root_mnt); 2913 if (IS_ERR(root_mnt)) 2914 goto out; 2915 2916 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2917 2918 out: 2919 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2920 error != 0 ? " [error]" : ""); 2921 return error; 2922 } 2923 2924 /* 2925 * Get the superblock for an NFS4 mountpoint 2926 */ 2927 static int nfs4_get_sb(struct file_system_type *fs_type, 2928 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2929 { 2930 struct nfs_parsed_mount_data *data; 2931 int error = -ENOMEM; 2932 2933 data = nfs_alloc_parsed_mount_data(4); 2934 if (data == NULL) 2935 goto out_free_data; 2936 2937 /* Validate the mount data */ 2938 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2939 if (error < 0) 2940 goto out; 2941 2942 error = nfs4_try_mount(flags, dev_name, data, mnt); 2943 2944 out: 2945 kfree(data->client_address); 2946 kfree(data->nfs_server.export_path); 2947 kfree(data->nfs_server.hostname); 2948 kfree(data->fscache_uniq); 2949 out_free_data: 2950 kfree(data); 2951 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2952 error != 0 ? " [error]" : ""); 2953 return error; 2954 } 2955 2956 static void nfs4_kill_super(struct super_block *sb) 2957 { 2958 struct nfs_server *server = NFS_SB(sb); 2959 2960 dprintk("--> %s\n", __func__); 2961 nfs_super_return_all_delegations(sb); 2962 kill_anon_super(sb); 2963 nfs_fscache_release_super_cookie(sb); 2964 nfs_free_server(server); 2965 dprintk("<-- %s\n", __func__); 2966 } 2967 2968 /* 2969 * Clone an NFS4 server record on xdev traversal (FSID-change) 2970 */ 2971 static struct dentry * 2972 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2973 const char *dev_name, void *raw_data) 2974 { 2975 struct nfs_clone_mount *data = raw_data; 2976 struct super_block *s; 2977 struct nfs_server *server; 2978 struct dentry *mntroot; 2979 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2980 struct nfs_sb_mountdata sb_mntdata = { 2981 .mntflags = flags, 2982 }; 2983 int error; 2984 2985 dprintk("--> nfs4_xdev_mount()\n"); 2986 2987 /* create a new volume representation */ 2988 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2989 if (IS_ERR(server)) { 2990 error = PTR_ERR(server); 2991 goto out_err_noserver; 2992 } 2993 sb_mntdata.server = server; 2994 2995 if (server->flags & NFS4_MOUNT_UNSHARED) 2996 compare_super = NULL; 2997 2998 /* Get a superblock - note that we may end up sharing one that already exists */ 2999 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3000 if (IS_ERR(s)) { 3001 error = PTR_ERR(s); 3002 goto out_err_nosb; 3003 } 3004 3005 if (s->s_fs_info != server) { 3006 nfs_free_server(server); 3007 server = NULL; 3008 } else { 3009 error = nfs_bdi_register(server); 3010 if (error) 3011 goto error_splat_bdi; 3012 } 3013 3014 if (!s->s_root) { 3015 /* initial superblock/root creation */ 3016 nfs4_clone_super(s, data->sb); 3017 nfs_fscache_get_super_cookie(s, NULL, data); 3018 } 3019 3020 mntroot = nfs4_get_root(s, data->fh); 3021 if (IS_ERR(mntroot)) { 3022 error = PTR_ERR(mntroot); 3023 goto error_splat_super; 3024 } 3025 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3026 dput(mntroot); 3027 error = -ESTALE; 3028 goto error_splat_super; 3029 } 3030 3031 s->s_flags |= MS_ACTIVE; 3032 3033 security_sb_clone_mnt_opts(data->sb, s); 3034 3035 dprintk("<-- nfs4_xdev_mount() = 0\n"); 3036 return mntroot; 3037 3038 out_err_nosb: 3039 nfs_free_server(server); 3040 out_err_noserver: 3041 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 3042 return ERR_PTR(error); 3043 3044 error_splat_super: 3045 if (server && !s->s_root) 3046 bdi_unregister(&server->backing_dev_info); 3047 error_splat_bdi: 3048 deactivate_locked_super(s); 3049 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 3050 return ERR_PTR(error); 3051 } 3052 3053 static struct dentry * 3054 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 3055 const char *dev_name, void *raw_data) 3056 { 3057 struct nfs_clone_mount *data = raw_data; 3058 struct super_block *s; 3059 struct nfs_server *server; 3060 struct dentry *mntroot; 3061 struct nfs_fh *mntfh; 3062 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 3063 struct nfs_sb_mountdata sb_mntdata = { 3064 .mntflags = flags, 3065 }; 3066 int error = -ENOMEM; 3067 3068 dprintk("--> nfs4_referral_get_sb()\n"); 3069 3070 mntfh = nfs_alloc_fhandle(); 3071 if (mntfh == NULL) 3072 goto out_err_nofh; 3073 3074 /* create a new volume representation */ 3075 server = nfs4_create_referral_server(data, mntfh); 3076 if (IS_ERR(server)) { 3077 error = PTR_ERR(server); 3078 goto out_err_noserver; 3079 } 3080 sb_mntdata.server = server; 3081 3082 if (server->flags & NFS4_MOUNT_UNSHARED) 3083 compare_super = NULL; 3084 3085 /* Get a superblock - note that we may end up sharing one that already exists */ 3086 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3087 if (IS_ERR(s)) { 3088 error = PTR_ERR(s); 3089 goto out_err_nosb; 3090 } 3091 3092 if (s->s_fs_info != server) { 3093 nfs_free_server(server); 3094 server = NULL; 3095 } else { 3096 error = nfs_bdi_register(server); 3097 if (error) 3098 goto error_splat_bdi; 3099 } 3100 3101 if (!s->s_root) { 3102 /* initial superblock/root creation */ 3103 nfs4_fill_super(s); 3104 nfs_fscache_get_super_cookie(s, NULL, data); 3105 } 3106 3107 mntroot = nfs4_get_root(s, mntfh); 3108 if (IS_ERR(mntroot)) { 3109 error = PTR_ERR(mntroot); 3110 goto error_splat_super; 3111 } 3112 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3113 dput(mntroot); 3114 error = -ESTALE; 3115 goto error_splat_super; 3116 } 3117 3118 s->s_flags |= MS_ACTIVE; 3119 3120 security_sb_clone_mnt_opts(data->sb, s); 3121 3122 nfs_free_fhandle(mntfh); 3123 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3124 return mntroot; 3125 3126 out_err_nosb: 3127 nfs_free_server(server); 3128 out_err_noserver: 3129 nfs_free_fhandle(mntfh); 3130 out_err_nofh: 3131 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3132 return ERR_PTR(error); 3133 3134 error_splat_super: 3135 if (server && !s->s_root) 3136 bdi_unregister(&server->backing_dev_info); 3137 error_splat_bdi: 3138 deactivate_locked_super(s); 3139 nfs_free_fhandle(mntfh); 3140 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3141 return ERR_PTR(error); 3142 } 3143 3144 /* 3145 * Create an NFS4 server record on referral traversal 3146 */ 3147 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 3148 int flags, const char *dev_name, void *raw_data, 3149 struct vfsmount *mnt) 3150 { 3151 struct nfs_clone_mount *data = raw_data; 3152 char *export_path; 3153 struct vfsmount *root_mnt; 3154 int error; 3155 3156 dprintk("--> nfs4_referral_get_sb()\n"); 3157 3158 export_path = data->mnt_path; 3159 data->mnt_path = "/"; 3160 3161 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3162 flags, data, data->hostname); 3163 data->mnt_path = export_path; 3164 3165 error = PTR_ERR(root_mnt); 3166 if (IS_ERR(root_mnt)) 3167 goto out; 3168 3169 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 3170 out: 3171 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 3172 error != 0 ? " [error]" : ""); 3173 return error; 3174 } 3175 3176 #endif /* CONFIG_NFS_V4 */ 3177