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 56 #include <asm/system.h> 57 #include <asm/uaccess.h> 58 59 #include "nfs4_fs.h" 60 #include "callback.h" 61 #include "delegation.h" 62 #include "iostat.h" 63 #include "internal.h" 64 #include "fscache.h" 65 #include "pnfs.h" 66 67 #define NFSDBG_FACILITY NFSDBG_VFS 68 69 #ifdef CONFIG_NFS_V3 70 #define NFS_DEFAULT_VERSION 3 71 #else 72 #define NFS_DEFAULT_VERSION 2 73 #endif 74 75 enum { 76 /* Mount options that take no arguments */ 77 Opt_soft, Opt_hard, 78 Opt_posix, Opt_noposix, 79 Opt_cto, Opt_nocto, 80 Opt_ac, Opt_noac, 81 Opt_lock, Opt_nolock, 82 Opt_v2, Opt_v3, Opt_v4, 83 Opt_udp, Opt_tcp, Opt_rdma, 84 Opt_acl, Opt_noacl, 85 Opt_rdirplus, Opt_nordirplus, 86 Opt_sharecache, Opt_nosharecache, 87 Opt_resvport, Opt_noresvport, 88 Opt_fscache, Opt_nofscache, 89 90 /* Mount options that take integer arguments */ 91 Opt_port, 92 Opt_rsize, Opt_wsize, Opt_bsize, 93 Opt_timeo, Opt_retrans, 94 Opt_acregmin, Opt_acregmax, 95 Opt_acdirmin, Opt_acdirmax, 96 Opt_actimeo, 97 Opt_namelen, 98 Opt_mountport, 99 Opt_mountvers, 100 Opt_nfsvers, 101 Opt_minorversion, 102 103 /* Mount options that take string arguments */ 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 105 Opt_addr, Opt_mountaddr, Opt_clientaddr, 106 Opt_lookupcache, 107 Opt_fscache_uniq, 108 Opt_local_lock, 109 110 /* Special mount options */ 111 Opt_userspace, Opt_deprecated, Opt_sloppy, 112 113 Opt_err 114 }; 115 116 static const match_table_t nfs_mount_option_tokens = { 117 { Opt_userspace, "bg" }, 118 { Opt_userspace, "fg" }, 119 { Opt_userspace, "retry=%s" }, 120 121 { Opt_sloppy, "sloppy" }, 122 123 { Opt_soft, "soft" }, 124 { Opt_hard, "hard" }, 125 { Opt_deprecated, "intr" }, 126 { Opt_deprecated, "nointr" }, 127 { Opt_posix, "posix" }, 128 { Opt_noposix, "noposix" }, 129 { Opt_cto, "cto" }, 130 { Opt_nocto, "nocto" }, 131 { Opt_ac, "ac" }, 132 { Opt_noac, "noac" }, 133 { Opt_lock, "lock" }, 134 { Opt_nolock, "nolock" }, 135 { Opt_v2, "v2" }, 136 { Opt_v3, "v3" }, 137 { Opt_v4, "v4" }, 138 { Opt_udp, "udp" }, 139 { Opt_tcp, "tcp" }, 140 { Opt_rdma, "rdma" }, 141 { Opt_acl, "acl" }, 142 { Opt_noacl, "noacl" }, 143 { Opt_rdirplus, "rdirplus" }, 144 { Opt_nordirplus, "nordirplus" }, 145 { Opt_sharecache, "sharecache" }, 146 { Opt_nosharecache, "nosharecache" }, 147 { Opt_resvport, "resvport" }, 148 { Opt_noresvport, "noresvport" }, 149 { Opt_fscache, "fsc" }, 150 { Opt_nofscache, "nofsc" }, 151 152 { Opt_port, "port=%s" }, 153 { Opt_rsize, "rsize=%s" }, 154 { Opt_wsize, "wsize=%s" }, 155 { Opt_bsize, "bsize=%s" }, 156 { Opt_timeo, "timeo=%s" }, 157 { Opt_retrans, "retrans=%s" }, 158 { Opt_acregmin, "acregmin=%s" }, 159 { Opt_acregmax, "acregmax=%s" }, 160 { Opt_acdirmin, "acdirmin=%s" }, 161 { Opt_acdirmax, "acdirmax=%s" }, 162 { Opt_actimeo, "actimeo=%s" }, 163 { Opt_namelen, "namlen=%s" }, 164 { Opt_mountport, "mountport=%s" }, 165 { Opt_mountvers, "mountvers=%s" }, 166 { Opt_nfsvers, "nfsvers=%s" }, 167 { Opt_nfsvers, "vers=%s" }, 168 { Opt_minorversion, "minorversion=%s" }, 169 170 { Opt_sec, "sec=%s" }, 171 { Opt_proto, "proto=%s" }, 172 { Opt_mountproto, "mountproto=%s" }, 173 { Opt_addr, "addr=%s" }, 174 { Opt_clientaddr, "clientaddr=%s" }, 175 { Opt_mounthost, "mounthost=%s" }, 176 { Opt_mountaddr, "mountaddr=%s" }, 177 178 { Opt_lookupcache, "lookupcache=%s" }, 179 { Opt_fscache_uniq, "fsc=%s" }, 180 { Opt_local_lock, "local_lock=%s" }, 181 182 { Opt_err, NULL } 183 }; 184 185 enum { 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 187 188 Opt_xprt_err 189 }; 190 191 static const match_table_t nfs_xprt_protocol_tokens = { 192 { Opt_xprt_udp, "udp" }, 193 { Opt_xprt_udp6, "udp6" }, 194 { Opt_xprt_tcp, "tcp" }, 195 { Opt_xprt_tcp6, "tcp6" }, 196 { Opt_xprt_rdma, "rdma" }, 197 198 { Opt_xprt_err, NULL } 199 }; 200 201 enum { 202 Opt_sec_none, Opt_sec_sys, 203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 206 207 Opt_sec_err 208 }; 209 210 static const match_table_t nfs_secflavor_tokens = { 211 { Opt_sec_none, "none" }, 212 { Opt_sec_none, "null" }, 213 { Opt_sec_sys, "sys" }, 214 215 { Opt_sec_krb5, "krb5" }, 216 { Opt_sec_krb5i, "krb5i" }, 217 { Opt_sec_krb5p, "krb5p" }, 218 219 { Opt_sec_lkey, "lkey" }, 220 { Opt_sec_lkeyi, "lkeyi" }, 221 { Opt_sec_lkeyp, "lkeyp" }, 222 223 { Opt_sec_spkm, "spkm3" }, 224 { Opt_sec_spkmi, "spkm3i" }, 225 { Opt_sec_spkmp, "spkm3p" }, 226 227 { Opt_sec_err, NULL } 228 }; 229 230 enum { 231 Opt_lookupcache_all, Opt_lookupcache_positive, 232 Opt_lookupcache_none, 233 234 Opt_lookupcache_err 235 }; 236 237 static match_table_t nfs_lookupcache_tokens = { 238 { Opt_lookupcache_all, "all" }, 239 { Opt_lookupcache_positive, "pos" }, 240 { Opt_lookupcache_positive, "positive" }, 241 { Opt_lookupcache_none, "none" }, 242 243 { Opt_lookupcache_err, NULL } 244 }; 245 246 enum { 247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 248 Opt_local_lock_none, 249 250 Opt_local_lock_err 251 }; 252 253 static match_table_t nfs_local_lock_tokens = { 254 { Opt_local_lock_all, "all" }, 255 { Opt_local_lock_flock, "flock" }, 256 { Opt_local_lock_posix, "posix" }, 257 { Opt_local_lock_none, "none" }, 258 259 { Opt_local_lock_err, NULL } 260 }; 261 262 263 static void nfs_umount_begin(struct super_block *); 264 static int nfs_statfs(struct dentry *, struct kstatfs *); 265 static int nfs_show_options(struct seq_file *, struct dentry *); 266 static int nfs_show_devname(struct seq_file *, struct dentry *); 267 static int nfs_show_path(struct seq_file *, struct dentry *); 268 static int nfs_show_stats(struct seq_file *, struct dentry *); 269 static struct dentry *nfs_fs_mount(struct file_system_type *, 270 int, const char *, void *); 271 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 272 int flags, const char *dev_name, void *raw_data); 273 static void nfs_put_super(struct super_block *); 274 static void nfs_kill_super(struct super_block *); 275 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 276 277 static struct file_system_type nfs_fs_type = { 278 .owner = THIS_MODULE, 279 .name = "nfs", 280 .mount = nfs_fs_mount, 281 .kill_sb = nfs_kill_super, 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 283 }; 284 285 struct file_system_type nfs_xdev_fs_type = { 286 .owner = THIS_MODULE, 287 .name = "nfs", 288 .mount = nfs_xdev_mount, 289 .kill_sb = nfs_kill_super, 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 291 }; 292 293 static const struct super_operations nfs_sops = { 294 .alloc_inode = nfs_alloc_inode, 295 .destroy_inode = nfs_destroy_inode, 296 .write_inode = nfs_write_inode, 297 .put_super = nfs_put_super, 298 .statfs = nfs_statfs, 299 .evict_inode = nfs_evict_inode, 300 .umount_begin = nfs_umount_begin, 301 .show_options = nfs_show_options, 302 .show_devname = nfs_show_devname, 303 .show_path = nfs_show_path, 304 .show_stats = nfs_show_stats, 305 .remount_fs = nfs_remount, 306 }; 307 308 #ifdef CONFIG_NFS_V4 309 static int nfs4_validate_text_mount_data(void *options, 310 struct nfs_parsed_mount_data *args, const char *dev_name); 311 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 312 struct nfs_parsed_mount_data *data); 313 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 314 int flags, const char *dev_name, void *raw_data); 315 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 316 int flags, const char *dev_name, void *raw_data); 317 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 318 int flags, const char *dev_name, void *raw_data); 319 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 320 int flags, const char *dev_name, void *raw_data); 321 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 322 int flags, const char *dev_name, void *raw_data); 323 static void nfs4_kill_super(struct super_block *sb); 324 325 static struct file_system_type nfs4_fs_type = { 326 .owner = THIS_MODULE, 327 .name = "nfs4", 328 .mount = nfs4_mount, 329 .kill_sb = nfs4_kill_super, 330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 331 }; 332 333 static struct file_system_type nfs4_remote_fs_type = { 334 .owner = THIS_MODULE, 335 .name = "nfs4", 336 .mount = nfs4_remote_mount, 337 .kill_sb = nfs4_kill_super, 338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 339 }; 340 341 struct file_system_type nfs4_xdev_fs_type = { 342 .owner = THIS_MODULE, 343 .name = "nfs4", 344 .mount = nfs4_xdev_mount, 345 .kill_sb = nfs4_kill_super, 346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 347 }; 348 349 static struct file_system_type nfs4_remote_referral_fs_type = { 350 .owner = THIS_MODULE, 351 .name = "nfs4", 352 .mount = nfs4_remote_referral_mount, 353 .kill_sb = nfs4_kill_super, 354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 355 }; 356 357 struct file_system_type nfs4_referral_fs_type = { 358 .owner = THIS_MODULE, 359 .name = "nfs4", 360 .mount = nfs4_referral_mount, 361 .kill_sb = nfs4_kill_super, 362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 363 }; 364 365 static const struct super_operations nfs4_sops = { 366 .alloc_inode = nfs_alloc_inode, 367 .destroy_inode = nfs_destroy_inode, 368 .write_inode = nfs_write_inode, 369 .put_super = nfs_put_super, 370 .statfs = nfs_statfs, 371 .evict_inode = nfs4_evict_inode, 372 .umount_begin = nfs_umount_begin, 373 .show_options = nfs_show_options, 374 .show_devname = nfs_show_devname, 375 .show_path = nfs_show_path, 376 .show_stats = nfs_show_stats, 377 .remount_fs = nfs_remount, 378 }; 379 #endif 380 381 static struct shrinker acl_shrinker = { 382 .shrink = nfs_access_cache_shrinker, 383 .seeks = DEFAULT_SEEKS, 384 }; 385 386 /* 387 * Register the NFS filesystems 388 */ 389 int __init register_nfs_fs(void) 390 { 391 int ret; 392 393 ret = register_filesystem(&nfs_fs_type); 394 if (ret < 0) 395 goto error_0; 396 397 ret = nfs_register_sysctl(); 398 if (ret < 0) 399 goto error_1; 400 #ifdef CONFIG_NFS_V4 401 ret = register_filesystem(&nfs4_fs_type); 402 if (ret < 0) 403 goto error_2; 404 #endif 405 register_shrinker(&acl_shrinker); 406 return 0; 407 408 #ifdef CONFIG_NFS_V4 409 error_2: 410 nfs_unregister_sysctl(); 411 #endif 412 error_1: 413 unregister_filesystem(&nfs_fs_type); 414 error_0: 415 return ret; 416 } 417 418 /* 419 * Unregister the NFS filesystems 420 */ 421 void __exit unregister_nfs_fs(void) 422 { 423 unregister_shrinker(&acl_shrinker); 424 #ifdef CONFIG_NFS_V4 425 unregister_filesystem(&nfs4_fs_type); 426 #endif 427 nfs_unregister_sysctl(); 428 unregister_filesystem(&nfs_fs_type); 429 } 430 431 void nfs_sb_active(struct super_block *sb) 432 { 433 struct nfs_server *server = NFS_SB(sb); 434 435 if (atomic_inc_return(&server->active) == 1) 436 atomic_inc(&sb->s_active); 437 } 438 439 void nfs_sb_deactive(struct super_block *sb) 440 { 441 struct nfs_server *server = NFS_SB(sb); 442 443 if (atomic_dec_and_test(&server->active)) 444 deactivate_super(sb); 445 } 446 447 /* 448 * Deliver file system statistics to userspace 449 */ 450 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 451 { 452 struct nfs_server *server = NFS_SB(dentry->d_sb); 453 unsigned char blockbits; 454 unsigned long blockres; 455 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 456 struct nfs_fsstat res; 457 int error = -ENOMEM; 458 459 res.fattr = nfs_alloc_fattr(); 460 if (res.fattr == NULL) 461 goto out_err; 462 463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 464 if (unlikely(error == -ESTALE)) { 465 struct dentry *pd_dentry; 466 467 pd_dentry = dget_parent(dentry); 468 if (pd_dentry != NULL) { 469 nfs_zap_caches(pd_dentry->d_inode); 470 dput(pd_dentry); 471 } 472 } 473 nfs_free_fattr(res.fattr); 474 if (error < 0) 475 goto out_err; 476 477 buf->f_type = NFS_SUPER_MAGIC; 478 479 /* 480 * Current versions of glibc do not correctly handle the 481 * case where f_frsize != f_bsize. Eventually we want to 482 * report the value of wtmult in this field. 483 */ 484 buf->f_frsize = dentry->d_sb->s_blocksize; 485 486 /* 487 * On most *nix systems, f_blocks, f_bfree, and f_bavail 488 * are reported in units of f_frsize. Linux hasn't had 489 * an f_frsize field in its statfs struct until recently, 490 * thus historically Linux's sys_statfs reports these 491 * fields in units of f_bsize. 492 */ 493 buf->f_bsize = dentry->d_sb->s_blocksize; 494 blockbits = dentry->d_sb->s_blocksize_bits; 495 blockres = (1 << blockbits) - 1; 496 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 497 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 498 buf->f_bavail = (res.abytes + blockres) >> blockbits; 499 500 buf->f_files = res.tfiles; 501 buf->f_ffree = res.afiles; 502 503 buf->f_namelen = server->namelen; 504 505 return 0; 506 507 out_err: 508 dprintk("%s: statfs error = %d\n", __func__, -error); 509 return error; 510 } 511 512 /* 513 * Map the security flavour number to a name 514 */ 515 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 516 { 517 static const struct { 518 rpc_authflavor_t flavour; 519 const char *str; 520 } sec_flavours[] = { 521 { RPC_AUTH_NULL, "null" }, 522 { RPC_AUTH_UNIX, "sys" }, 523 { RPC_AUTH_GSS_KRB5, "krb5" }, 524 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 525 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 526 { RPC_AUTH_GSS_LKEY, "lkey" }, 527 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 528 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 529 { RPC_AUTH_GSS_SPKM, "spkm" }, 530 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 531 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 532 { UINT_MAX, "unknown" } 533 }; 534 int i; 535 536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 537 if (sec_flavours[i].flavour == flavour) 538 break; 539 } 540 return sec_flavours[i].str; 541 } 542 543 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 544 int showdefaults) 545 { 546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 547 548 seq_printf(m, ",mountproto="); 549 switch (sap->sa_family) { 550 case AF_INET: 551 switch (nfss->mountd_protocol) { 552 case IPPROTO_UDP: 553 seq_printf(m, RPCBIND_NETID_UDP); 554 break; 555 case IPPROTO_TCP: 556 seq_printf(m, RPCBIND_NETID_TCP); 557 break; 558 default: 559 if (showdefaults) 560 seq_printf(m, "auto"); 561 } 562 break; 563 case AF_INET6: 564 switch (nfss->mountd_protocol) { 565 case IPPROTO_UDP: 566 seq_printf(m, RPCBIND_NETID_UDP6); 567 break; 568 case IPPROTO_TCP: 569 seq_printf(m, RPCBIND_NETID_TCP6); 570 break; 571 default: 572 if (showdefaults) 573 seq_printf(m, "auto"); 574 } 575 break; 576 default: 577 if (showdefaults) 578 seq_printf(m, "auto"); 579 } 580 } 581 582 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 583 int showdefaults) 584 { 585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 586 587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 588 return; 589 590 switch (sap->sa_family) { 591 case AF_INET: { 592 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 594 break; 595 } 596 case AF_INET6: { 597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 599 break; 600 } 601 default: 602 if (showdefaults) 603 seq_printf(m, ",mountaddr=unspecified"); 604 } 605 606 if (nfss->mountd_version || showdefaults) 607 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 608 if ((nfss->mountd_port && 609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 610 showdefaults) 611 seq_printf(m, ",mountport=%u", nfss->mountd_port); 612 613 nfs_show_mountd_netid(m, nfss, showdefaults); 614 } 615 616 #ifdef CONFIG_NFS_V4 617 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 618 int showdefaults) 619 { 620 struct nfs_client *clp = nfss->nfs_client; 621 622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion); 624 } 625 #else 626 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 627 int showdefaults) 628 { 629 } 630 #endif 631 632 /* 633 * Describe the mount options in force on this server representation 634 */ 635 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 636 int showdefaults) 637 { 638 static const struct proc_nfs_info { 639 int flag; 640 const char *str; 641 const char *nostr; 642 } nfs_info[] = { 643 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 644 { NFS_MOUNT_POSIX, ",posix", "" }, 645 { NFS_MOUNT_NOCTO, ",nocto", "" }, 646 { NFS_MOUNT_NOAC, ",noac", "" }, 647 { NFS_MOUNT_NONLM, ",nolock", "" }, 648 { NFS_MOUNT_NOACL, ",noacl", "" }, 649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 652 { 0, NULL, NULL } 653 }; 654 const struct proc_nfs_info *nfs_infop; 655 struct nfs_client *clp = nfss->nfs_client; 656 u32 version = clp->rpc_ops->version; 657 int local_flock, local_fcntl; 658 659 seq_printf(m, ",vers=%u", version); 660 seq_printf(m, ",rsize=%u", nfss->rsize); 661 seq_printf(m, ",wsize=%u", nfss->wsize); 662 if (nfss->bsize != 0) 663 seq_printf(m, ",bsize=%u", nfss->bsize); 664 seq_printf(m, ",namlen=%u", nfss->namelen); 665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 674 if (nfss->flags & nfs_infop->flag) 675 seq_puts(m, nfs_infop->str); 676 else 677 seq_puts(m, nfs_infop->nostr); 678 } 679 seq_printf(m, ",proto=%s", 680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 681 if (version == 4) { 682 if (nfss->port != NFS_PORT) 683 seq_printf(m, ",port=%u", nfss->port); 684 } else 685 if (nfss->port) 686 seq_printf(m, ",port=%u", nfss->port); 687 688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 691 692 if (version != 4) 693 nfs_show_mountd_options(m, nfss, showdefaults); 694 else 695 nfs_show_nfsv4_options(m, nfss, showdefaults); 696 697 if (nfss->options & NFS_OPTION_FSCACHE) 698 seq_printf(m, ",fsc"); 699 700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 702 seq_printf(m, ",lookupcache=none"); 703 else 704 seq_printf(m, ",lookupcache=pos"); 705 } 706 707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 709 710 if (!local_flock && !local_fcntl) 711 seq_printf(m, ",local_lock=none"); 712 else if (local_flock && local_fcntl) 713 seq_printf(m, ",local_lock=all"); 714 else if (local_flock) 715 seq_printf(m, ",local_lock=flock"); 716 else 717 seq_printf(m, ",local_lock=posix"); 718 } 719 720 /* 721 * Describe the mount options on this VFS mountpoint 722 */ 723 static int nfs_show_options(struct seq_file *m, struct dentry *root) 724 { 725 struct nfs_server *nfss = NFS_SB(root->d_sb); 726 727 nfs_show_mount_options(m, nfss, 0); 728 729 seq_printf(m, ",addr=%s", 730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 731 RPC_DISPLAY_ADDR)); 732 733 return 0; 734 } 735 736 #ifdef CONFIG_NFS_V4 737 #ifdef CONFIG_NFS_V4_1 738 static void show_sessions(struct seq_file *m, struct nfs_server *server) 739 { 740 if (nfs4_has_session(server->nfs_client)) 741 seq_printf(m, ",sessions"); 742 } 743 #else 744 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 745 #endif 746 #endif 747 748 #ifdef CONFIG_NFS_V4 749 #ifdef CONFIG_NFS_V4_1 750 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 751 { 752 seq_printf(m, ",pnfs="); 753 if (server->pnfs_curr_ld) 754 seq_printf(m, "%s", server->pnfs_curr_ld->name); 755 else 756 seq_printf(m, "not configured"); 757 } 758 #else 759 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {} 760 #endif 761 #endif 762 763 static int nfs_show_devname(struct seq_file *m, struct dentry *root) 764 { 765 char *page = (char *) __get_free_page(GFP_KERNEL); 766 char *devname, *dummy; 767 int err = 0; 768 if (!page) 769 return -ENOMEM; 770 devname = nfs_path(&dummy, root, page, PAGE_SIZE); 771 if (IS_ERR(devname)) 772 err = PTR_ERR(devname); 773 else 774 seq_escape(m, devname, " \t\n\\"); 775 free_page((unsigned long)page); 776 return err; 777 } 778 779 static int nfs_show_path(struct seq_file *m, struct dentry *dentry) 780 { 781 seq_puts(m, "/"); 782 return 0; 783 } 784 785 /* 786 * Present statistical information for this VFS mountpoint 787 */ 788 static int nfs_show_stats(struct seq_file *m, struct dentry *root) 789 { 790 int i, cpu; 791 struct nfs_server *nfss = NFS_SB(root->d_sb); 792 struct rpc_auth *auth = nfss->client->cl_auth; 793 struct nfs_iostats totals = { }; 794 795 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 796 797 /* 798 * Display all mount option settings 799 */ 800 seq_printf(m, "\n\topts:\t"); 801 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 802 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 803 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 804 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 805 nfs_show_mount_options(m, nfss, 1); 806 807 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 808 809 seq_printf(m, "\n\tcaps:\t"); 810 seq_printf(m, "caps=0x%x", nfss->caps); 811 seq_printf(m, ",wtmult=%u", nfss->wtmult); 812 seq_printf(m, ",dtsize=%u", nfss->dtsize); 813 seq_printf(m, ",bsize=%u", nfss->bsize); 814 seq_printf(m, ",namlen=%u", nfss->namelen); 815 816 #ifdef CONFIG_NFS_V4 817 if (nfss->nfs_client->rpc_ops->version == 4) { 818 seq_printf(m, "\n\tnfsv4:\t"); 819 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 820 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 821 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 822 show_sessions(m, nfss); 823 show_pnfs(m, nfss); 824 } 825 #endif 826 827 /* 828 * Display security flavor in effect for this mount 829 */ 830 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 831 if (auth->au_flavor) 832 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 833 834 /* 835 * Display superblock I/O counters 836 */ 837 for_each_possible_cpu(cpu) { 838 struct nfs_iostats *stats; 839 840 preempt_disable(); 841 stats = per_cpu_ptr(nfss->io_stats, cpu); 842 843 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 844 totals.events[i] += stats->events[i]; 845 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 846 totals.bytes[i] += stats->bytes[i]; 847 #ifdef CONFIG_NFS_FSCACHE 848 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 849 totals.fscache[i] += stats->fscache[i]; 850 #endif 851 852 preempt_enable(); 853 } 854 855 seq_printf(m, "\n\tevents:\t"); 856 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 857 seq_printf(m, "%lu ", totals.events[i]); 858 seq_printf(m, "\n\tbytes:\t"); 859 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 860 seq_printf(m, "%Lu ", totals.bytes[i]); 861 #ifdef CONFIG_NFS_FSCACHE 862 if (nfss->options & NFS_OPTION_FSCACHE) { 863 seq_printf(m, "\n\tfsc:\t"); 864 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 865 seq_printf(m, "%Lu ", totals.bytes[i]); 866 } 867 #endif 868 seq_printf(m, "\n"); 869 870 rpc_print_iostats(m, nfss->client); 871 872 return 0; 873 } 874 875 /* 876 * Begin unmount by attempting to remove all automounted mountpoints we added 877 * in response to xdev traversals and referrals 878 */ 879 static void nfs_umount_begin(struct super_block *sb) 880 { 881 struct nfs_server *server; 882 struct rpc_clnt *rpc; 883 884 server = NFS_SB(sb); 885 /* -EIO all pending I/O */ 886 rpc = server->client_acl; 887 if (!IS_ERR(rpc)) 888 rpc_killall_tasks(rpc); 889 rpc = server->client; 890 if (!IS_ERR(rpc)) 891 rpc_killall_tasks(rpc); 892 } 893 894 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 895 { 896 struct nfs_parsed_mount_data *data; 897 898 data = kzalloc(sizeof(*data), GFP_KERNEL); 899 if (data) { 900 data->acregmin = NFS_DEF_ACREGMIN; 901 data->acregmax = NFS_DEF_ACREGMAX; 902 data->acdirmin = NFS_DEF_ACDIRMIN; 903 data->acdirmax = NFS_DEF_ACDIRMAX; 904 data->mount_server.port = NFS_UNSPEC_PORT; 905 data->nfs_server.port = NFS_UNSPEC_PORT; 906 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 907 data->auth_flavors[0] = RPC_AUTH_UNIX; 908 data->auth_flavor_len = 1; 909 data->version = version; 910 data->minorversion = 0; 911 security_init_mnt_opts(&data->lsm_opts); 912 } 913 return data; 914 } 915 916 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 917 { 918 if (data) { 919 kfree(data->client_address); 920 kfree(data->mount_server.hostname); 921 kfree(data->nfs_server.export_path); 922 kfree(data->nfs_server.hostname); 923 kfree(data->fscache_uniq); 924 security_free_mnt_opts(&data->lsm_opts); 925 kfree(data); 926 } 927 } 928 929 /* 930 * Sanity-check a server address provided by the mount command. 931 * 932 * Address family must be initialized, and address must not be 933 * the ANY address for that family. 934 */ 935 static int nfs_verify_server_address(struct sockaddr *addr) 936 { 937 switch (addr->sa_family) { 938 case AF_INET: { 939 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 940 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 941 } 942 case AF_INET6: { 943 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 944 return !ipv6_addr_any(sa); 945 } 946 } 947 948 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 949 return 0; 950 } 951 952 /* 953 * Select between a default port value and a user-specified port value. 954 * If a zero value is set, then autobind will be used. 955 */ 956 static void nfs_set_port(struct sockaddr *sap, int *port, 957 const unsigned short default_port) 958 { 959 if (*port == NFS_UNSPEC_PORT) 960 *port = default_port; 961 962 rpc_set_port(sap, *port); 963 } 964 965 /* 966 * Sanity check the NFS transport protocol. 967 * 968 */ 969 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 970 { 971 switch (mnt->nfs_server.protocol) { 972 case XPRT_TRANSPORT_UDP: 973 case XPRT_TRANSPORT_TCP: 974 case XPRT_TRANSPORT_RDMA: 975 break; 976 default: 977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 978 } 979 } 980 981 /* 982 * For text based NFSv2/v3 mounts, the mount protocol transport default 983 * settings should depend upon the specified NFS transport. 984 */ 985 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 986 { 987 nfs_validate_transport_protocol(mnt); 988 989 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 990 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 991 return; 992 switch (mnt->nfs_server.protocol) { 993 case XPRT_TRANSPORT_UDP: 994 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 995 break; 996 case XPRT_TRANSPORT_TCP: 997 case XPRT_TRANSPORT_RDMA: 998 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 999 } 1000 } 1001 1002 /* 1003 * Parse the value of the 'sec=' option. 1004 */ 1005 static int nfs_parse_security_flavors(char *value, 1006 struct nfs_parsed_mount_data *mnt) 1007 { 1008 substring_t args[MAX_OPT_ARGS]; 1009 1010 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1011 1012 switch (match_token(value, nfs_secflavor_tokens, args)) { 1013 case Opt_sec_none: 1014 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1015 break; 1016 case Opt_sec_sys: 1017 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1018 break; 1019 case Opt_sec_krb5: 1020 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1021 break; 1022 case Opt_sec_krb5i: 1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1024 break; 1025 case Opt_sec_krb5p: 1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1027 break; 1028 case Opt_sec_lkey: 1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1030 break; 1031 case Opt_sec_lkeyi: 1032 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1033 break; 1034 case Opt_sec_lkeyp: 1035 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1036 break; 1037 case Opt_sec_spkm: 1038 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1039 break; 1040 case Opt_sec_spkmi: 1041 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1042 break; 1043 case Opt_sec_spkmp: 1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1045 break; 1046 default: 1047 return 0; 1048 } 1049 1050 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1051 mnt->auth_flavor_len = 1; 1052 return 1; 1053 } 1054 1055 static int nfs_get_option_str(substring_t args[], char **option) 1056 { 1057 kfree(*option); 1058 *option = match_strdup(args); 1059 return !option; 1060 } 1061 1062 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1063 { 1064 int rc; 1065 char *string; 1066 1067 string = match_strdup(args); 1068 if (string == NULL) 1069 return -ENOMEM; 1070 rc = strict_strtoul(string, 10, option); 1071 kfree(string); 1072 1073 return rc; 1074 } 1075 1076 /* 1077 * Error-check and convert a string of mount options from user space into 1078 * a data structure. The whole mount string is processed; bad options are 1079 * skipped as they are encountered. If there were no errors, return 1; 1080 * otherwise return 0 (zero). 1081 */ 1082 static int nfs_parse_mount_options(char *raw, 1083 struct nfs_parsed_mount_data *mnt) 1084 { 1085 char *p, *string, *secdata; 1086 int rc, sloppy = 0, invalid_option = 0; 1087 unsigned short protofamily = AF_UNSPEC; 1088 unsigned short mountfamily = AF_UNSPEC; 1089 1090 if (!raw) { 1091 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1092 return 1; 1093 } 1094 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1095 1096 secdata = alloc_secdata(); 1097 if (!secdata) 1098 goto out_nomem; 1099 1100 rc = security_sb_copy_data(raw, secdata); 1101 if (rc) 1102 goto out_security_failure; 1103 1104 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1105 if (rc) 1106 goto out_security_failure; 1107 1108 free_secdata(secdata); 1109 1110 while ((p = strsep(&raw, ",")) != NULL) { 1111 substring_t args[MAX_OPT_ARGS]; 1112 unsigned long option; 1113 int token; 1114 1115 if (!*p) 1116 continue; 1117 1118 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1119 1120 token = match_token(p, nfs_mount_option_tokens, args); 1121 switch (token) { 1122 1123 /* 1124 * boolean options: foo/nofoo 1125 */ 1126 case Opt_soft: 1127 mnt->flags |= NFS_MOUNT_SOFT; 1128 break; 1129 case Opt_hard: 1130 mnt->flags &= ~NFS_MOUNT_SOFT; 1131 break; 1132 case Opt_posix: 1133 mnt->flags |= NFS_MOUNT_POSIX; 1134 break; 1135 case Opt_noposix: 1136 mnt->flags &= ~NFS_MOUNT_POSIX; 1137 break; 1138 case Opt_cto: 1139 mnt->flags &= ~NFS_MOUNT_NOCTO; 1140 break; 1141 case Opt_nocto: 1142 mnt->flags |= NFS_MOUNT_NOCTO; 1143 break; 1144 case Opt_ac: 1145 mnt->flags &= ~NFS_MOUNT_NOAC; 1146 break; 1147 case Opt_noac: 1148 mnt->flags |= NFS_MOUNT_NOAC; 1149 break; 1150 case Opt_lock: 1151 mnt->flags &= ~NFS_MOUNT_NONLM; 1152 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1153 NFS_MOUNT_LOCAL_FCNTL); 1154 break; 1155 case Opt_nolock: 1156 mnt->flags |= NFS_MOUNT_NONLM; 1157 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1158 NFS_MOUNT_LOCAL_FCNTL); 1159 break; 1160 case Opt_v2: 1161 mnt->flags &= ~NFS_MOUNT_VER3; 1162 mnt->version = 2; 1163 break; 1164 case Opt_v3: 1165 mnt->flags |= NFS_MOUNT_VER3; 1166 mnt->version = 3; 1167 break; 1168 case Opt_v4: 1169 mnt->flags &= ~NFS_MOUNT_VER3; 1170 mnt->version = 4; 1171 break; 1172 case Opt_udp: 1173 mnt->flags &= ~NFS_MOUNT_TCP; 1174 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1175 break; 1176 case Opt_tcp: 1177 mnt->flags |= NFS_MOUNT_TCP; 1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1179 break; 1180 case Opt_rdma: 1181 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1182 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1183 xprt_load_transport(p); 1184 break; 1185 case Opt_acl: 1186 mnt->flags &= ~NFS_MOUNT_NOACL; 1187 break; 1188 case Opt_noacl: 1189 mnt->flags |= NFS_MOUNT_NOACL; 1190 break; 1191 case Opt_rdirplus: 1192 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1193 break; 1194 case Opt_nordirplus: 1195 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1196 break; 1197 case Opt_sharecache: 1198 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1199 break; 1200 case Opt_nosharecache: 1201 mnt->flags |= NFS_MOUNT_UNSHARED; 1202 break; 1203 case Opt_resvport: 1204 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1205 break; 1206 case Opt_noresvport: 1207 mnt->flags |= NFS_MOUNT_NORESVPORT; 1208 break; 1209 case Opt_fscache: 1210 mnt->options |= NFS_OPTION_FSCACHE; 1211 kfree(mnt->fscache_uniq); 1212 mnt->fscache_uniq = NULL; 1213 break; 1214 case Opt_nofscache: 1215 mnt->options &= ~NFS_OPTION_FSCACHE; 1216 kfree(mnt->fscache_uniq); 1217 mnt->fscache_uniq = NULL; 1218 break; 1219 1220 /* 1221 * options that take numeric values 1222 */ 1223 case Opt_port: 1224 if (nfs_get_option_ul(args, &option) || 1225 option > USHRT_MAX) 1226 goto out_invalid_value; 1227 mnt->nfs_server.port = option; 1228 break; 1229 case Opt_rsize: 1230 if (nfs_get_option_ul(args, &option)) 1231 goto out_invalid_value; 1232 mnt->rsize = option; 1233 break; 1234 case Opt_wsize: 1235 if (nfs_get_option_ul(args, &option)) 1236 goto out_invalid_value; 1237 mnt->wsize = option; 1238 break; 1239 case Opt_bsize: 1240 if (nfs_get_option_ul(args, &option)) 1241 goto out_invalid_value; 1242 mnt->bsize = option; 1243 break; 1244 case Opt_timeo: 1245 if (nfs_get_option_ul(args, &option) || option == 0) 1246 goto out_invalid_value; 1247 mnt->timeo = option; 1248 break; 1249 case Opt_retrans: 1250 if (nfs_get_option_ul(args, &option) || option == 0) 1251 goto out_invalid_value; 1252 mnt->retrans = option; 1253 break; 1254 case Opt_acregmin: 1255 if (nfs_get_option_ul(args, &option)) 1256 goto out_invalid_value; 1257 mnt->acregmin = option; 1258 break; 1259 case Opt_acregmax: 1260 if (nfs_get_option_ul(args, &option)) 1261 goto out_invalid_value; 1262 mnt->acregmax = option; 1263 break; 1264 case Opt_acdirmin: 1265 if (nfs_get_option_ul(args, &option)) 1266 goto out_invalid_value; 1267 mnt->acdirmin = option; 1268 break; 1269 case Opt_acdirmax: 1270 if (nfs_get_option_ul(args, &option)) 1271 goto out_invalid_value; 1272 mnt->acdirmax = option; 1273 break; 1274 case Opt_actimeo: 1275 if (nfs_get_option_ul(args, &option)) 1276 goto out_invalid_value; 1277 mnt->acregmin = mnt->acregmax = 1278 mnt->acdirmin = mnt->acdirmax = option; 1279 break; 1280 case Opt_namelen: 1281 if (nfs_get_option_ul(args, &option)) 1282 goto out_invalid_value; 1283 mnt->namlen = option; 1284 break; 1285 case Opt_mountport: 1286 if (nfs_get_option_ul(args, &option) || 1287 option > USHRT_MAX) 1288 goto out_invalid_value; 1289 mnt->mount_server.port = option; 1290 break; 1291 case Opt_mountvers: 1292 if (nfs_get_option_ul(args, &option) || 1293 option < NFS_MNT_VERSION || 1294 option > NFS_MNT3_VERSION) 1295 goto out_invalid_value; 1296 mnt->mount_server.version = option; 1297 break; 1298 case Opt_nfsvers: 1299 if (nfs_get_option_ul(args, &option)) 1300 goto out_invalid_value; 1301 switch (option) { 1302 case NFS2_VERSION: 1303 mnt->flags &= ~NFS_MOUNT_VER3; 1304 mnt->version = 2; 1305 break; 1306 case NFS3_VERSION: 1307 mnt->flags |= NFS_MOUNT_VER3; 1308 mnt->version = 3; 1309 break; 1310 case NFS4_VERSION: 1311 mnt->flags &= ~NFS_MOUNT_VER3; 1312 mnt->version = 4; 1313 break; 1314 default: 1315 goto out_invalid_value; 1316 } 1317 break; 1318 case Opt_minorversion: 1319 if (nfs_get_option_ul(args, &option)) 1320 goto out_invalid_value; 1321 if (option > NFS4_MAX_MINOR_VERSION) 1322 goto out_invalid_value; 1323 mnt->minorversion = option; 1324 break; 1325 1326 /* 1327 * options that take text values 1328 */ 1329 case Opt_sec: 1330 string = match_strdup(args); 1331 if (string == NULL) 1332 goto out_nomem; 1333 rc = nfs_parse_security_flavors(string, mnt); 1334 kfree(string); 1335 if (!rc) { 1336 dfprintk(MOUNT, "NFS: unrecognized " 1337 "security flavor\n"); 1338 return 0; 1339 } 1340 break; 1341 case Opt_proto: 1342 string = match_strdup(args); 1343 if (string == NULL) 1344 goto out_nomem; 1345 token = match_token(string, 1346 nfs_xprt_protocol_tokens, args); 1347 1348 protofamily = AF_INET; 1349 switch (token) { 1350 case Opt_xprt_udp6: 1351 protofamily = AF_INET6; 1352 case Opt_xprt_udp: 1353 mnt->flags &= ~NFS_MOUNT_TCP; 1354 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1355 break; 1356 case Opt_xprt_tcp6: 1357 protofamily = AF_INET6; 1358 case Opt_xprt_tcp: 1359 mnt->flags |= NFS_MOUNT_TCP; 1360 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1361 break; 1362 case Opt_xprt_rdma: 1363 /* vector side protocols to TCP */ 1364 mnt->flags |= NFS_MOUNT_TCP; 1365 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1366 xprt_load_transport(string); 1367 break; 1368 default: 1369 dfprintk(MOUNT, "NFS: unrecognized " 1370 "transport protocol\n"); 1371 kfree(string); 1372 return 0; 1373 } 1374 kfree(string); 1375 break; 1376 case Opt_mountproto: 1377 string = match_strdup(args); 1378 if (string == NULL) 1379 goto out_nomem; 1380 token = match_token(string, 1381 nfs_xprt_protocol_tokens, args); 1382 kfree(string); 1383 1384 mountfamily = AF_INET; 1385 switch (token) { 1386 case Opt_xprt_udp6: 1387 mountfamily = AF_INET6; 1388 case Opt_xprt_udp: 1389 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1390 break; 1391 case Opt_xprt_tcp6: 1392 mountfamily = AF_INET6; 1393 case Opt_xprt_tcp: 1394 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1395 break; 1396 case Opt_xprt_rdma: /* not used for side protocols */ 1397 default: 1398 dfprintk(MOUNT, "NFS: unrecognized " 1399 "transport protocol\n"); 1400 return 0; 1401 } 1402 break; 1403 case Opt_addr: 1404 string = match_strdup(args); 1405 if (string == NULL) 1406 goto out_nomem; 1407 mnt->nfs_server.addrlen = 1408 rpc_pton(string, strlen(string), 1409 (struct sockaddr *) 1410 &mnt->nfs_server.address, 1411 sizeof(mnt->nfs_server.address)); 1412 kfree(string); 1413 if (mnt->nfs_server.addrlen == 0) 1414 goto out_invalid_address; 1415 break; 1416 case Opt_clientaddr: 1417 if (nfs_get_option_str(args, &mnt->client_address)) 1418 goto out_nomem; 1419 break; 1420 case Opt_mounthost: 1421 if (nfs_get_option_str(args, 1422 &mnt->mount_server.hostname)) 1423 goto out_nomem; 1424 break; 1425 case Opt_mountaddr: 1426 string = match_strdup(args); 1427 if (string == NULL) 1428 goto out_nomem; 1429 mnt->mount_server.addrlen = 1430 rpc_pton(string, strlen(string), 1431 (struct sockaddr *) 1432 &mnt->mount_server.address, 1433 sizeof(mnt->mount_server.address)); 1434 kfree(string); 1435 if (mnt->mount_server.addrlen == 0) 1436 goto out_invalid_address; 1437 break; 1438 case Opt_lookupcache: 1439 string = match_strdup(args); 1440 if (string == NULL) 1441 goto out_nomem; 1442 token = match_token(string, 1443 nfs_lookupcache_tokens, args); 1444 kfree(string); 1445 switch (token) { 1446 case Opt_lookupcache_all: 1447 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1448 break; 1449 case Opt_lookupcache_positive: 1450 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1451 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1452 break; 1453 case Opt_lookupcache_none: 1454 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1455 break; 1456 default: 1457 dfprintk(MOUNT, "NFS: invalid " 1458 "lookupcache argument\n"); 1459 return 0; 1460 }; 1461 break; 1462 case Opt_fscache_uniq: 1463 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1464 goto out_nomem; 1465 mnt->options |= NFS_OPTION_FSCACHE; 1466 break; 1467 case Opt_local_lock: 1468 string = match_strdup(args); 1469 if (string == NULL) 1470 goto out_nomem; 1471 token = match_token(string, nfs_local_lock_tokens, 1472 args); 1473 kfree(string); 1474 switch (token) { 1475 case Opt_local_lock_all: 1476 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1477 NFS_MOUNT_LOCAL_FCNTL); 1478 break; 1479 case Opt_local_lock_flock: 1480 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1481 break; 1482 case Opt_local_lock_posix: 1483 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1484 break; 1485 case Opt_local_lock_none: 1486 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1487 NFS_MOUNT_LOCAL_FCNTL); 1488 break; 1489 default: 1490 dfprintk(MOUNT, "NFS: invalid " 1491 "local_lock argument\n"); 1492 return 0; 1493 }; 1494 break; 1495 1496 /* 1497 * Special options 1498 */ 1499 case Opt_sloppy: 1500 sloppy = 1; 1501 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1502 break; 1503 case Opt_userspace: 1504 case Opt_deprecated: 1505 dfprintk(MOUNT, "NFS: ignoring mount option " 1506 "'%s'\n", p); 1507 break; 1508 1509 default: 1510 invalid_option = 1; 1511 dfprintk(MOUNT, "NFS: unrecognized mount option " 1512 "'%s'\n", p); 1513 } 1514 } 1515 1516 if (!sloppy && invalid_option) 1517 return 0; 1518 1519 /* 1520 * verify that any proto=/mountproto= options match the address 1521 * familiies in the addr=/mountaddr= options. 1522 */ 1523 if (protofamily != AF_UNSPEC && 1524 protofamily != mnt->nfs_server.address.ss_family) 1525 goto out_proto_mismatch; 1526 1527 if (mountfamily != AF_UNSPEC) { 1528 if (mnt->mount_server.addrlen) { 1529 if (mountfamily != mnt->mount_server.address.ss_family) 1530 goto out_mountproto_mismatch; 1531 } else { 1532 if (mountfamily != mnt->nfs_server.address.ss_family) 1533 goto out_mountproto_mismatch; 1534 } 1535 } 1536 1537 return 1; 1538 1539 out_mountproto_mismatch: 1540 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1541 "option\n"); 1542 return 0; 1543 out_proto_mismatch: 1544 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1545 return 0; 1546 out_invalid_address: 1547 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1548 return 0; 1549 out_invalid_value: 1550 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1551 return 0; 1552 out_nomem: 1553 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1554 return 0; 1555 out_security_failure: 1556 free_secdata(secdata); 1557 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1558 return 0; 1559 } 1560 1561 /* 1562 * Match the requested auth flavors with the list returned by 1563 * the server. Returns zero and sets the mount's authentication 1564 * flavor on success; returns -EACCES if server does not support 1565 * the requested flavor. 1566 */ 1567 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1568 struct nfs_mount_request *request) 1569 { 1570 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1571 1572 /* 1573 * Certain releases of Linux's mountd return an empty 1574 * flavor list. To prevent behavioral regression with 1575 * these servers (ie. rejecting mounts that used to 1576 * succeed), revert to pre-2.6.32 behavior (no checking) 1577 * if the returned flavor list is empty. 1578 */ 1579 if (server_authlist_len == 0) 1580 return 0; 1581 1582 /* 1583 * We avoid sophisticated negotiating here, as there are 1584 * plenty of cases where we can get it wrong, providing 1585 * either too little or too much security. 1586 * 1587 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1588 * flavor listed first. However, some servers list 1589 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1590 * preferred default, in args->auth_flavors[0] if user 1591 * didn't specify sec= mount option. 1592 */ 1593 for (i = 0; i < args->auth_flavor_len; i++) 1594 for (j = 0; j < server_authlist_len; j++) 1595 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1596 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1597 request->auth_flavs[j]); 1598 args->auth_flavors[0] = request->auth_flavs[j]; 1599 return 0; 1600 } 1601 1602 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1603 nfs_umount(request); 1604 return -EACCES; 1605 } 1606 1607 /* 1608 * Use the remote server's MOUNT service to request the NFS file handle 1609 * corresponding to the provided path. 1610 */ 1611 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1612 struct nfs_fh *root_fh) 1613 { 1614 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1615 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1616 struct nfs_mount_request request = { 1617 .sap = (struct sockaddr *) 1618 &args->mount_server.address, 1619 .dirpath = args->nfs_server.export_path, 1620 .protocol = args->mount_server.protocol, 1621 .fh = root_fh, 1622 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1623 .auth_flav_len = &server_authlist_len, 1624 .auth_flavs = server_authlist, 1625 }; 1626 int status; 1627 1628 if (args->mount_server.version == 0) { 1629 switch (args->version) { 1630 default: 1631 args->mount_server.version = NFS_MNT3_VERSION; 1632 break; 1633 case 2: 1634 args->mount_server.version = NFS_MNT_VERSION; 1635 } 1636 } 1637 request.version = args->mount_server.version; 1638 1639 if (args->mount_server.hostname) 1640 request.hostname = args->mount_server.hostname; 1641 else 1642 request.hostname = args->nfs_server.hostname; 1643 1644 /* 1645 * Construct the mount server's address. 1646 */ 1647 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1648 memcpy(request.sap, &args->nfs_server.address, 1649 args->nfs_server.addrlen); 1650 args->mount_server.addrlen = args->nfs_server.addrlen; 1651 } 1652 request.salen = args->mount_server.addrlen; 1653 nfs_set_port(request.sap, &args->mount_server.port, 0); 1654 1655 /* 1656 * Now ask the mount server to map our export path 1657 * to a file handle. 1658 */ 1659 status = nfs_mount(&request); 1660 if (status != 0) { 1661 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1662 request.hostname, status); 1663 return status; 1664 } 1665 1666 /* 1667 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1668 */ 1669 if (args->mount_server.version != NFS_MNT3_VERSION) 1670 return 0; 1671 return nfs_walk_authlist(args, &request); 1672 } 1673 1674 /* 1675 * Split "dev_name" into "hostname:export_path". 1676 * 1677 * The leftmost colon demarks the split between the server's hostname 1678 * and the export path. If the hostname starts with a left square 1679 * bracket, then it may contain colons. 1680 * 1681 * Note: caller frees hostname and export path, even on error. 1682 */ 1683 static int nfs_parse_devname(const char *dev_name, 1684 char **hostname, size_t maxnamlen, 1685 char **export_path, size_t maxpathlen) 1686 { 1687 size_t len; 1688 char *end; 1689 1690 /* Is the host name protected with square brakcets? */ 1691 if (*dev_name == '[') { 1692 end = strchr(++dev_name, ']'); 1693 if (end == NULL || end[1] != ':') 1694 goto out_bad_devname; 1695 1696 len = end - dev_name; 1697 end++; 1698 } else { 1699 char *comma; 1700 1701 end = strchr(dev_name, ':'); 1702 if (end == NULL) 1703 goto out_bad_devname; 1704 len = end - dev_name; 1705 1706 /* kill possible hostname list: not supported */ 1707 comma = strchr(dev_name, ','); 1708 if (comma != NULL && comma < end) 1709 *comma = 0; 1710 } 1711 1712 if (len > maxnamlen) 1713 goto out_hostname; 1714 1715 /* N.B. caller will free nfs_server.hostname in all cases */ 1716 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1717 if (*hostname == NULL) 1718 goto out_nomem; 1719 len = strlen(++end); 1720 if (len > maxpathlen) 1721 goto out_path; 1722 *export_path = kstrndup(end, len, GFP_KERNEL); 1723 if (!*export_path) 1724 goto out_nomem; 1725 1726 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1727 return 0; 1728 1729 out_bad_devname: 1730 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1731 return -EINVAL; 1732 1733 out_nomem: 1734 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1735 return -ENOMEM; 1736 1737 out_hostname: 1738 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1739 return -ENAMETOOLONG; 1740 1741 out_path: 1742 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1743 return -ENAMETOOLONG; 1744 } 1745 1746 /* 1747 * Validate the NFS2/NFS3 mount data 1748 * - fills in the mount root filehandle 1749 * 1750 * For option strings, user space handles the following behaviors: 1751 * 1752 * + DNS: mapping server host name to IP address ("addr=" option) 1753 * 1754 * + failure mode: how to behave if a mount request can't be handled 1755 * immediately ("fg/bg" option) 1756 * 1757 * + retry: how often to retry a mount request ("retry=" option) 1758 * 1759 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1760 * mountproto=tcp after mountproto=udp, and so on 1761 */ 1762 static int nfs_validate_mount_data(void *options, 1763 struct nfs_parsed_mount_data *args, 1764 struct nfs_fh *mntfh, 1765 const char *dev_name) 1766 { 1767 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1768 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1769 1770 if (data == NULL) 1771 goto out_no_data; 1772 1773 switch (data->version) { 1774 case 1: 1775 data->namlen = 0; 1776 case 2: 1777 data->bsize = 0; 1778 case 3: 1779 if (data->flags & NFS_MOUNT_VER3) 1780 goto out_no_v3; 1781 data->root.size = NFS2_FHSIZE; 1782 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1783 case 4: 1784 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1785 goto out_no_sec; 1786 case 5: 1787 memset(data->context, 0, sizeof(data->context)); 1788 case 6: 1789 if (data->flags & NFS_MOUNT_VER3) { 1790 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1791 goto out_invalid_fh; 1792 mntfh->size = data->root.size; 1793 args->version = 3; 1794 } else { 1795 mntfh->size = NFS2_FHSIZE; 1796 args->version = 2; 1797 } 1798 1799 1800 memcpy(mntfh->data, data->root.data, mntfh->size); 1801 if (mntfh->size < sizeof(mntfh->data)) 1802 memset(mntfh->data + mntfh->size, 0, 1803 sizeof(mntfh->data) - mntfh->size); 1804 1805 /* 1806 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1807 * can deal with. 1808 */ 1809 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1810 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1811 args->rsize = data->rsize; 1812 args->wsize = data->wsize; 1813 args->timeo = data->timeo; 1814 args->retrans = data->retrans; 1815 args->acregmin = data->acregmin; 1816 args->acregmax = data->acregmax; 1817 args->acdirmin = data->acdirmin; 1818 args->acdirmax = data->acdirmax; 1819 1820 memcpy(sap, &data->addr, sizeof(data->addr)); 1821 args->nfs_server.addrlen = sizeof(data->addr); 1822 if (!nfs_verify_server_address(sap)) 1823 goto out_no_address; 1824 1825 if (!(data->flags & NFS_MOUNT_TCP)) 1826 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1827 /* N.B. caller will free nfs_server.hostname in all cases */ 1828 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1829 args->namlen = data->namlen; 1830 args->bsize = data->bsize; 1831 1832 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1833 args->auth_flavors[0] = data->pseudoflavor; 1834 if (!args->nfs_server.hostname) 1835 goto out_nomem; 1836 1837 if (!(data->flags & NFS_MOUNT_NONLM)) 1838 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1839 NFS_MOUNT_LOCAL_FCNTL); 1840 else 1841 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1842 NFS_MOUNT_LOCAL_FCNTL); 1843 /* 1844 * The legacy version 6 binary mount data from userspace has a 1845 * field used only to transport selinux information into the 1846 * the kernel. To continue to support that functionality we 1847 * have a touch of selinux knowledge here in the NFS code. The 1848 * userspace code converted context=blah to just blah so we are 1849 * converting back to the full string selinux understands. 1850 */ 1851 if (data->context[0]){ 1852 #ifdef CONFIG_SECURITY_SELINUX 1853 int rc; 1854 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1855 if (!opts_str) 1856 return -ENOMEM; 1857 strcpy(opts_str, "context="); 1858 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1859 strcat(opts_str, &data->context[0]); 1860 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1861 kfree(opts_str); 1862 if (rc) 1863 return rc; 1864 #else 1865 return -EINVAL; 1866 #endif 1867 } 1868 1869 break; 1870 default: { 1871 int status; 1872 1873 if (nfs_parse_mount_options((char *)options, args) == 0) 1874 return -EINVAL; 1875 1876 if (!nfs_verify_server_address(sap)) 1877 goto out_no_address; 1878 1879 if (args->version == 4) 1880 #ifdef CONFIG_NFS_V4 1881 return nfs4_validate_text_mount_data(options, 1882 args, dev_name); 1883 #else 1884 goto out_v4_not_compiled; 1885 #endif 1886 1887 nfs_set_port(sap, &args->nfs_server.port, 0); 1888 1889 nfs_set_mount_transport_protocol(args); 1890 1891 status = nfs_parse_devname(dev_name, 1892 &args->nfs_server.hostname, 1893 PAGE_SIZE, 1894 &args->nfs_server.export_path, 1895 NFS_MAXPATHLEN); 1896 if (!status) 1897 status = nfs_try_mount(args, mntfh); 1898 1899 kfree(args->nfs_server.export_path); 1900 args->nfs_server.export_path = NULL; 1901 1902 if (status) 1903 return status; 1904 1905 break; 1906 } 1907 } 1908 1909 #ifndef CONFIG_NFS_V3 1910 if (args->version == 3) 1911 goto out_v3_not_compiled; 1912 #endif /* !CONFIG_NFS_V3 */ 1913 1914 return 0; 1915 1916 out_no_data: 1917 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1918 return -EINVAL; 1919 1920 out_no_v3: 1921 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1922 data->version); 1923 return -EINVAL; 1924 1925 out_no_sec: 1926 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1927 return -EINVAL; 1928 1929 #ifndef CONFIG_NFS_V3 1930 out_v3_not_compiled: 1931 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1932 return -EPROTONOSUPPORT; 1933 #endif /* !CONFIG_NFS_V3 */ 1934 1935 #ifndef CONFIG_NFS_V4 1936 out_v4_not_compiled: 1937 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1938 return -EPROTONOSUPPORT; 1939 #endif /* !CONFIG_NFS_V4 */ 1940 1941 out_nomem: 1942 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1943 return -ENOMEM; 1944 1945 out_no_address: 1946 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1947 return -EINVAL; 1948 1949 out_invalid_fh: 1950 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1951 return -EINVAL; 1952 } 1953 1954 static int 1955 nfs_compare_remount_data(struct nfs_server *nfss, 1956 struct nfs_parsed_mount_data *data) 1957 { 1958 if (data->flags != nfss->flags || 1959 data->rsize != nfss->rsize || 1960 data->wsize != nfss->wsize || 1961 data->retrans != nfss->client->cl_timeout->to_retries || 1962 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1963 data->acregmin != nfss->acregmin / HZ || 1964 data->acregmax != nfss->acregmax / HZ || 1965 data->acdirmin != nfss->acdirmin / HZ || 1966 data->acdirmax != nfss->acdirmax / HZ || 1967 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1968 data->nfs_server.port != nfss->port || 1969 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1970 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1971 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1972 return -EINVAL; 1973 1974 return 0; 1975 } 1976 1977 static int 1978 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1979 { 1980 int error; 1981 struct nfs_server *nfss = sb->s_fs_info; 1982 struct nfs_parsed_mount_data *data; 1983 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1984 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1985 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1986 1987 /* 1988 * Userspace mount programs that send binary options generally send 1989 * them populated with default values. We have no way to know which 1990 * ones were explicitly specified. Fall back to legacy behavior and 1991 * just return success. 1992 */ 1993 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1994 (nfsvers <= 3 && (!options || (options->version >= 1 && 1995 options->version <= 6)))) 1996 return 0; 1997 1998 data = kzalloc(sizeof(*data), GFP_KERNEL); 1999 if (data == NULL) 2000 return -ENOMEM; 2001 2002 /* fill out struct with values from existing mount */ 2003 data->flags = nfss->flags; 2004 data->rsize = nfss->rsize; 2005 data->wsize = nfss->wsize; 2006 data->retrans = nfss->client->cl_timeout->to_retries; 2007 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2008 data->acregmin = nfss->acregmin / HZ; 2009 data->acregmax = nfss->acregmax / HZ; 2010 data->acdirmin = nfss->acdirmin / HZ; 2011 data->acdirmax = nfss->acdirmax / HZ; 2012 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2013 data->nfs_server.port = nfss->port; 2014 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2015 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2016 data->nfs_server.addrlen); 2017 2018 /* overwrite those values with any that were specified */ 2019 error = nfs_parse_mount_options((char *)options, data); 2020 if (error < 0) 2021 goto out; 2022 2023 /* 2024 * noac is a special case. It implies -o sync, but that's not 2025 * necessarily reflected in the mtab options. do_remount_sb 2026 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2027 * remount options, so we have to explicitly reset it. 2028 */ 2029 if (data->flags & NFS_MOUNT_NOAC) 2030 *flags |= MS_SYNCHRONOUS; 2031 2032 /* compare new mount options with old ones */ 2033 error = nfs_compare_remount_data(nfss, data); 2034 out: 2035 kfree(data); 2036 return error; 2037 } 2038 2039 /* 2040 * Initialise the common bits of the superblock 2041 */ 2042 static inline void nfs_initialise_sb(struct super_block *sb) 2043 { 2044 struct nfs_server *server = NFS_SB(sb); 2045 2046 sb->s_magic = NFS_SUPER_MAGIC; 2047 2048 /* We probably want something more informative here */ 2049 snprintf(sb->s_id, sizeof(sb->s_id), 2050 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2051 2052 if (sb->s_blocksize == 0) 2053 sb->s_blocksize = nfs_block_bits(server->wsize, 2054 &sb->s_blocksize_bits); 2055 2056 sb->s_bdi = &server->backing_dev_info; 2057 2058 nfs_super_set_maxbytes(sb, server->maxfilesize); 2059 } 2060 2061 /* 2062 * Finish setting up an NFS2/3 superblock 2063 */ 2064 static void nfs_fill_super(struct super_block *sb, 2065 struct nfs_parsed_mount_data *data) 2066 { 2067 struct nfs_server *server = NFS_SB(sb); 2068 2069 sb->s_blocksize_bits = 0; 2070 sb->s_blocksize = 0; 2071 if (data->bsize) 2072 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2073 2074 if (server->nfs_client->rpc_ops->version == 3) { 2075 /* The VFS shouldn't apply the umask to mode bits. We will do 2076 * so ourselves when necessary. 2077 */ 2078 sb->s_flags |= MS_POSIXACL; 2079 sb->s_time_gran = 1; 2080 } 2081 2082 sb->s_op = &nfs_sops; 2083 nfs_initialise_sb(sb); 2084 } 2085 2086 /* 2087 * Finish setting up a cloned NFS2/3 superblock 2088 */ 2089 static void nfs_clone_super(struct super_block *sb, 2090 const struct super_block *old_sb) 2091 { 2092 struct nfs_server *server = NFS_SB(sb); 2093 2094 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2095 sb->s_blocksize = old_sb->s_blocksize; 2096 sb->s_maxbytes = old_sb->s_maxbytes; 2097 2098 if (server->nfs_client->rpc_ops->version == 3) { 2099 /* The VFS shouldn't apply the umask to mode bits. We will do 2100 * so ourselves when necessary. 2101 */ 2102 sb->s_flags |= MS_POSIXACL; 2103 sb->s_time_gran = 1; 2104 } 2105 2106 sb->s_op = old_sb->s_op; 2107 nfs_initialise_sb(sb); 2108 } 2109 2110 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2111 { 2112 const struct nfs_server *a = s->s_fs_info; 2113 const struct rpc_clnt *clnt_a = a->client; 2114 const struct rpc_clnt *clnt_b = b->client; 2115 2116 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2117 goto Ebusy; 2118 if (a->nfs_client != b->nfs_client) 2119 goto Ebusy; 2120 if (a->flags != b->flags) 2121 goto Ebusy; 2122 if (a->wsize != b->wsize) 2123 goto Ebusy; 2124 if (a->rsize != b->rsize) 2125 goto Ebusy; 2126 if (a->acregmin != b->acregmin) 2127 goto Ebusy; 2128 if (a->acregmax != b->acregmax) 2129 goto Ebusy; 2130 if (a->acdirmin != b->acdirmin) 2131 goto Ebusy; 2132 if (a->acdirmax != b->acdirmax) 2133 goto Ebusy; 2134 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2135 goto Ebusy; 2136 return 1; 2137 Ebusy: 2138 return 0; 2139 } 2140 2141 struct nfs_sb_mountdata { 2142 struct nfs_server *server; 2143 int mntflags; 2144 }; 2145 2146 static int nfs_set_super(struct super_block *s, void *data) 2147 { 2148 struct nfs_sb_mountdata *sb_mntdata = data; 2149 struct nfs_server *server = sb_mntdata->server; 2150 int ret; 2151 2152 s->s_flags = sb_mntdata->mntflags; 2153 s->s_fs_info = server; 2154 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2155 ret = set_anon_super(s, server); 2156 if (ret == 0) 2157 server->s_dev = s->s_dev; 2158 return ret; 2159 } 2160 2161 static int nfs_compare_super_address(struct nfs_server *server1, 2162 struct nfs_server *server2) 2163 { 2164 struct sockaddr *sap1, *sap2; 2165 2166 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2167 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2168 2169 if (sap1->sa_family != sap2->sa_family) 2170 return 0; 2171 2172 switch (sap1->sa_family) { 2173 case AF_INET: { 2174 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2175 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2176 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2177 return 0; 2178 if (sin1->sin_port != sin2->sin_port) 2179 return 0; 2180 break; 2181 } 2182 case AF_INET6: { 2183 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2184 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2185 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2186 return 0; 2187 if (sin1->sin6_port != sin2->sin6_port) 2188 return 0; 2189 break; 2190 } 2191 default: 2192 return 0; 2193 } 2194 2195 return 1; 2196 } 2197 2198 static int nfs_compare_super(struct super_block *sb, void *data) 2199 { 2200 struct nfs_sb_mountdata *sb_mntdata = data; 2201 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2202 int mntflags = sb_mntdata->mntflags; 2203 2204 if (!nfs_compare_super_address(old, server)) 2205 return 0; 2206 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2207 if (old->flags & NFS_MOUNT_UNSHARED) 2208 return 0; 2209 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2210 return 0; 2211 return nfs_compare_mount_options(sb, server, mntflags); 2212 } 2213 2214 static int nfs_bdi_register(struct nfs_server *server) 2215 { 2216 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2217 } 2218 2219 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2220 int flags, const char *dev_name, void *raw_data) 2221 { 2222 struct nfs_server *server = NULL; 2223 struct super_block *s; 2224 struct nfs_parsed_mount_data *data; 2225 struct nfs_fh *mntfh; 2226 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2227 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2228 struct nfs_sb_mountdata sb_mntdata = { 2229 .mntflags = flags, 2230 }; 2231 int error; 2232 2233 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); 2234 mntfh = nfs_alloc_fhandle(); 2235 if (data == NULL || mntfh == NULL) 2236 goto out; 2237 2238 /* Validate the mount data */ 2239 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2240 if (error < 0) { 2241 mntroot = ERR_PTR(error); 2242 goto out; 2243 } 2244 2245 #ifdef CONFIG_NFS_V4 2246 if (data->version == 4) { 2247 mntroot = nfs4_try_mount(flags, dev_name, data); 2248 goto out; 2249 } 2250 #endif /* CONFIG_NFS_V4 */ 2251 2252 /* Get a volume representation */ 2253 server = nfs_create_server(data, mntfh); 2254 if (IS_ERR(server)) { 2255 mntroot = ERR_CAST(server); 2256 goto out; 2257 } 2258 sb_mntdata.server = server; 2259 2260 if (server->flags & NFS_MOUNT_UNSHARED) 2261 compare_super = NULL; 2262 2263 /* -o noac implies -o sync */ 2264 if (server->flags & NFS_MOUNT_NOAC) 2265 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2266 2267 /* Get a superblock - note that we may end up sharing one that already exists */ 2268 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2269 if (IS_ERR(s)) { 2270 mntroot = ERR_CAST(s); 2271 goto out_err_nosb; 2272 } 2273 2274 if (s->s_fs_info != server) { 2275 nfs_free_server(server); 2276 server = NULL; 2277 } else { 2278 error = nfs_bdi_register(server); 2279 if (error) { 2280 mntroot = ERR_PTR(error); 2281 goto error_splat_bdi; 2282 } 2283 } 2284 2285 if (!s->s_root) { 2286 /* initial superblock/root creation */ 2287 nfs_fill_super(s, data); 2288 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL); 2289 } 2290 2291 mntroot = nfs_get_root(s, mntfh, dev_name); 2292 if (IS_ERR(mntroot)) 2293 goto error_splat_super; 2294 2295 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2296 if (error) 2297 goto error_splat_root; 2298 2299 s->s_flags |= MS_ACTIVE; 2300 2301 out: 2302 nfs_free_parsed_mount_data(data); 2303 nfs_free_fhandle(mntfh); 2304 return mntroot; 2305 2306 out_err_nosb: 2307 nfs_free_server(server); 2308 goto out; 2309 2310 error_splat_root: 2311 dput(mntroot); 2312 mntroot = ERR_PTR(error); 2313 error_splat_super: 2314 if (server && !s->s_root) 2315 bdi_unregister(&server->backing_dev_info); 2316 error_splat_bdi: 2317 deactivate_locked_super(s); 2318 goto out; 2319 } 2320 2321 /* 2322 * Ensure that we unregister the bdi before kill_anon_super 2323 * releases the device name 2324 */ 2325 static void nfs_put_super(struct super_block *s) 2326 { 2327 struct nfs_server *server = NFS_SB(s); 2328 2329 bdi_unregister(&server->backing_dev_info); 2330 } 2331 2332 /* 2333 * Destroy an NFS2/3 superblock 2334 */ 2335 static void nfs_kill_super(struct super_block *s) 2336 { 2337 struct nfs_server *server = NFS_SB(s); 2338 2339 kill_anon_super(s); 2340 nfs_fscache_release_super_cookie(s); 2341 nfs_free_server(server); 2342 } 2343 2344 /* 2345 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2346 */ 2347 static struct dentry * 2348 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2349 const char *dev_name, void *raw_data) 2350 { 2351 struct nfs_clone_mount *data = raw_data; 2352 struct super_block *s; 2353 struct nfs_server *server; 2354 struct dentry *mntroot; 2355 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2356 struct nfs_sb_mountdata sb_mntdata = { 2357 .mntflags = flags, 2358 }; 2359 int error; 2360 2361 dprintk("--> nfs_xdev_mount()\n"); 2362 2363 /* create a new volume representation */ 2364 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2365 if (IS_ERR(server)) { 2366 error = PTR_ERR(server); 2367 goto out_err_noserver; 2368 } 2369 sb_mntdata.server = server; 2370 2371 if (server->flags & NFS_MOUNT_UNSHARED) 2372 compare_super = NULL; 2373 2374 /* -o noac implies -o sync */ 2375 if (server->flags & NFS_MOUNT_NOAC) 2376 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2377 2378 /* Get a superblock - note that we may end up sharing one that already exists */ 2379 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2380 if (IS_ERR(s)) { 2381 error = PTR_ERR(s); 2382 goto out_err_nosb; 2383 } 2384 2385 if (s->s_fs_info != server) { 2386 nfs_free_server(server); 2387 server = NULL; 2388 } else { 2389 error = nfs_bdi_register(server); 2390 if (error) 2391 goto error_splat_bdi; 2392 } 2393 2394 if (!s->s_root) { 2395 /* initial superblock/root creation */ 2396 nfs_clone_super(s, data->sb); 2397 nfs_fscache_get_super_cookie(s, NULL, data); 2398 } 2399 2400 mntroot = nfs_get_root(s, data->fh, dev_name); 2401 if (IS_ERR(mntroot)) { 2402 error = PTR_ERR(mntroot); 2403 goto error_splat_super; 2404 } 2405 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2406 dput(mntroot); 2407 error = -ESTALE; 2408 goto error_splat_super; 2409 } 2410 2411 s->s_flags |= MS_ACTIVE; 2412 2413 /* clone any lsm security options from the parent to the new sb */ 2414 security_sb_clone_mnt_opts(data->sb, s); 2415 2416 dprintk("<-- nfs_xdev_mount() = 0\n"); 2417 return mntroot; 2418 2419 out_err_nosb: 2420 nfs_free_server(server); 2421 out_err_noserver: 2422 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2423 return ERR_PTR(error); 2424 2425 error_splat_super: 2426 if (server && !s->s_root) 2427 bdi_unregister(&server->backing_dev_info); 2428 error_splat_bdi: 2429 deactivate_locked_super(s); 2430 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2431 return ERR_PTR(error); 2432 } 2433 2434 #ifdef CONFIG_NFS_V4 2435 2436 /* 2437 * Finish setting up a cloned NFS4 superblock 2438 */ 2439 static void nfs4_clone_super(struct super_block *sb, 2440 const struct super_block *old_sb) 2441 { 2442 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2443 sb->s_blocksize = old_sb->s_blocksize; 2444 sb->s_maxbytes = old_sb->s_maxbytes; 2445 sb->s_time_gran = 1; 2446 sb->s_op = old_sb->s_op; 2447 /* 2448 * The VFS shouldn't apply the umask to mode bits. We will do 2449 * so ourselves when necessary. 2450 */ 2451 sb->s_flags |= MS_POSIXACL; 2452 sb->s_xattr = old_sb->s_xattr; 2453 nfs_initialise_sb(sb); 2454 } 2455 2456 /* 2457 * Set up an NFS4 superblock 2458 */ 2459 static void nfs4_fill_super(struct super_block *sb) 2460 { 2461 sb->s_time_gran = 1; 2462 sb->s_op = &nfs4_sops; 2463 /* 2464 * The VFS shouldn't apply the umask to mode bits. We will do 2465 * so ourselves when necessary. 2466 */ 2467 sb->s_flags |= MS_POSIXACL; 2468 sb->s_xattr = nfs4_xattr_handlers; 2469 nfs_initialise_sb(sb); 2470 } 2471 2472 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2473 { 2474 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2475 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2476 } 2477 2478 static int nfs4_validate_text_mount_data(void *options, 2479 struct nfs_parsed_mount_data *args, 2480 const char *dev_name) 2481 { 2482 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2483 2484 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2485 2486 nfs_validate_transport_protocol(args); 2487 2488 nfs4_validate_mount_flags(args); 2489 2490 if (args->version != 4) { 2491 dfprintk(MOUNT, 2492 "NFS4: Illegal mount version\n"); 2493 return -EINVAL; 2494 } 2495 2496 if (args->auth_flavor_len > 1) { 2497 dfprintk(MOUNT, 2498 "NFS4: Too many RPC auth flavours specified\n"); 2499 return -EINVAL; 2500 } 2501 2502 if (args->client_address == NULL) { 2503 dfprintk(MOUNT, 2504 "NFS4: mount program didn't pass callback address\n"); 2505 return -EINVAL; 2506 } 2507 2508 return nfs_parse_devname(dev_name, 2509 &args->nfs_server.hostname, 2510 NFS4_MAXNAMLEN, 2511 &args->nfs_server.export_path, 2512 NFS4_MAXPATHLEN); 2513 } 2514 2515 /* 2516 * Validate NFSv4 mount options 2517 */ 2518 static int nfs4_validate_mount_data(void *options, 2519 struct nfs_parsed_mount_data *args, 2520 const char *dev_name) 2521 { 2522 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2523 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2524 char *c; 2525 2526 if (data == NULL) 2527 goto out_no_data; 2528 2529 switch (data->version) { 2530 case 1: 2531 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2532 goto out_no_address; 2533 if (data->host_addrlen == 0) 2534 goto out_no_address; 2535 args->nfs_server.addrlen = data->host_addrlen; 2536 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2537 return -EFAULT; 2538 if (!nfs_verify_server_address(sap)) 2539 goto out_no_address; 2540 2541 if (data->auth_flavourlen) { 2542 if (data->auth_flavourlen > 1) 2543 goto out_inval_auth; 2544 if (copy_from_user(&args->auth_flavors[0], 2545 data->auth_flavours, 2546 sizeof(args->auth_flavors[0]))) 2547 return -EFAULT; 2548 } 2549 2550 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2551 if (IS_ERR(c)) 2552 return PTR_ERR(c); 2553 args->nfs_server.hostname = c; 2554 2555 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2556 if (IS_ERR(c)) 2557 return PTR_ERR(c); 2558 args->nfs_server.export_path = c; 2559 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2560 2561 c = strndup_user(data->client_addr.data, 16); 2562 if (IS_ERR(c)) 2563 return PTR_ERR(c); 2564 args->client_address = c; 2565 2566 /* 2567 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2568 * can deal with. 2569 */ 2570 2571 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2572 args->rsize = data->rsize; 2573 args->wsize = data->wsize; 2574 args->timeo = data->timeo; 2575 args->retrans = data->retrans; 2576 args->acregmin = data->acregmin; 2577 args->acregmax = data->acregmax; 2578 args->acdirmin = data->acdirmin; 2579 args->acdirmax = data->acdirmax; 2580 args->nfs_server.protocol = data->proto; 2581 nfs_validate_transport_protocol(args); 2582 2583 break; 2584 default: 2585 if (nfs_parse_mount_options((char *)options, args) == 0) 2586 return -EINVAL; 2587 2588 if (!nfs_verify_server_address(sap)) 2589 return -EINVAL; 2590 2591 return nfs4_validate_text_mount_data(options, args, dev_name); 2592 } 2593 2594 return 0; 2595 2596 out_no_data: 2597 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2598 return -EINVAL; 2599 2600 out_inval_auth: 2601 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2602 data->auth_flavourlen); 2603 return -EINVAL; 2604 2605 out_no_address: 2606 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2607 return -EINVAL; 2608 } 2609 2610 /* 2611 * Get the superblock for the NFS4 root partition 2612 */ 2613 static struct dentry * 2614 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2615 const char *dev_name, void *raw_data) 2616 { 2617 struct nfs_parsed_mount_data *data = raw_data; 2618 struct super_block *s; 2619 struct nfs_server *server; 2620 struct nfs_fh *mntfh; 2621 struct dentry *mntroot; 2622 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2623 struct nfs_sb_mountdata sb_mntdata = { 2624 .mntflags = flags, 2625 }; 2626 int error = -ENOMEM; 2627 2628 mntfh = nfs_alloc_fhandle(); 2629 if (data == NULL || mntfh == NULL) 2630 goto out; 2631 2632 /* Get a volume representation */ 2633 server = nfs4_create_server(data, mntfh); 2634 if (IS_ERR(server)) { 2635 error = PTR_ERR(server); 2636 goto out; 2637 } 2638 sb_mntdata.server = server; 2639 2640 if (server->flags & NFS4_MOUNT_UNSHARED) 2641 compare_super = NULL; 2642 2643 /* -o noac implies -o sync */ 2644 if (server->flags & NFS_MOUNT_NOAC) 2645 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2646 2647 /* Get a superblock - note that we may end up sharing one that already exists */ 2648 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2649 if (IS_ERR(s)) { 2650 error = PTR_ERR(s); 2651 goto out_free; 2652 } 2653 2654 if (s->s_fs_info != server) { 2655 nfs_free_server(server); 2656 server = NULL; 2657 } else { 2658 error = nfs_bdi_register(server); 2659 if (error) 2660 goto error_splat_bdi; 2661 } 2662 2663 if (!s->s_root) { 2664 /* initial superblock/root creation */ 2665 nfs4_fill_super(s); 2666 nfs_fscache_get_super_cookie( 2667 s, data ? data->fscache_uniq : NULL, NULL); 2668 } 2669 2670 mntroot = nfs4_get_root(s, mntfh, dev_name); 2671 if (IS_ERR(mntroot)) { 2672 error = PTR_ERR(mntroot); 2673 goto error_splat_super; 2674 } 2675 2676 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2677 if (error) 2678 goto error_splat_root; 2679 2680 s->s_flags |= MS_ACTIVE; 2681 2682 nfs_free_fhandle(mntfh); 2683 return mntroot; 2684 2685 out: 2686 nfs_free_fhandle(mntfh); 2687 return ERR_PTR(error); 2688 2689 out_free: 2690 nfs_free_server(server); 2691 goto out; 2692 2693 error_splat_root: 2694 dput(mntroot); 2695 error_splat_super: 2696 if (server && !s->s_root) 2697 bdi_unregister(&server->backing_dev_info); 2698 error_splat_bdi: 2699 deactivate_locked_super(s); 2700 goto out; 2701 } 2702 2703 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2704 int flags, void *data, const char *hostname) 2705 { 2706 struct vfsmount *root_mnt; 2707 char *root_devname; 2708 size_t len; 2709 2710 len = strlen(hostname) + 3; 2711 root_devname = kmalloc(len, GFP_KERNEL); 2712 if (root_devname == NULL) 2713 return ERR_PTR(-ENOMEM); 2714 snprintf(root_devname, len, "%s:/", hostname); 2715 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2716 kfree(root_devname); 2717 return root_mnt; 2718 } 2719 2720 struct nfs_referral_count { 2721 struct list_head list; 2722 const struct task_struct *task; 2723 unsigned int referral_count; 2724 }; 2725 2726 static LIST_HEAD(nfs_referral_count_list); 2727 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2728 2729 static struct nfs_referral_count *nfs_find_referral_count(void) 2730 { 2731 struct nfs_referral_count *p; 2732 2733 list_for_each_entry(p, &nfs_referral_count_list, list) { 2734 if (p->task == current) 2735 return p; 2736 } 2737 return NULL; 2738 } 2739 2740 #define NFS_MAX_NESTED_REFERRALS 2 2741 2742 static int nfs_referral_loop_protect(void) 2743 { 2744 struct nfs_referral_count *p, *new; 2745 int ret = -ENOMEM; 2746 2747 new = kmalloc(sizeof(*new), GFP_KERNEL); 2748 if (!new) 2749 goto out; 2750 new->task = current; 2751 new->referral_count = 1; 2752 2753 ret = 0; 2754 spin_lock(&nfs_referral_count_list_lock); 2755 p = nfs_find_referral_count(); 2756 if (p != NULL) { 2757 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2758 ret = -ELOOP; 2759 else 2760 p->referral_count++; 2761 } else { 2762 list_add(&new->list, &nfs_referral_count_list); 2763 new = NULL; 2764 } 2765 spin_unlock(&nfs_referral_count_list_lock); 2766 kfree(new); 2767 out: 2768 return ret; 2769 } 2770 2771 static void nfs_referral_loop_unprotect(void) 2772 { 2773 struct nfs_referral_count *p; 2774 2775 spin_lock(&nfs_referral_count_list_lock); 2776 p = nfs_find_referral_count(); 2777 p->referral_count--; 2778 if (p->referral_count == 0) 2779 list_del(&p->list); 2780 else 2781 p = NULL; 2782 spin_unlock(&nfs_referral_count_list_lock); 2783 kfree(p); 2784 } 2785 2786 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, 2787 const char *export_path) 2788 { 2789 struct dentry *dentry; 2790 int err; 2791 2792 if (IS_ERR(root_mnt)) 2793 return ERR_CAST(root_mnt); 2794 2795 err = nfs_referral_loop_protect(); 2796 if (err) { 2797 mntput(root_mnt); 2798 return ERR_PTR(err); 2799 } 2800 2801 dentry = mount_subtree(root_mnt, export_path); 2802 nfs_referral_loop_unprotect(); 2803 2804 return dentry; 2805 } 2806 2807 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 2808 struct nfs_parsed_mount_data *data) 2809 { 2810 char *export_path; 2811 struct vfsmount *root_mnt; 2812 struct dentry *res; 2813 2814 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2815 2816 export_path = data->nfs_server.export_path; 2817 data->nfs_server.export_path = "/"; 2818 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2819 data->nfs_server.hostname); 2820 data->nfs_server.export_path = export_path; 2821 2822 res = nfs_follow_remote_path(root_mnt, export_path); 2823 2824 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", 2825 IS_ERR(res) ? PTR_ERR(res) : 0, 2826 IS_ERR(res) ? " [error]" : ""); 2827 return res; 2828 } 2829 2830 /* 2831 * Get the superblock for an NFS4 mountpoint 2832 */ 2833 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 2834 int flags, const char *dev_name, void *raw_data) 2835 { 2836 struct nfs_parsed_mount_data *data; 2837 int error = -ENOMEM; 2838 struct dentry *res = ERR_PTR(-ENOMEM); 2839 2840 data = nfs_alloc_parsed_mount_data(4); 2841 if (data == NULL) 2842 goto out; 2843 2844 /* Validate the mount data */ 2845 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2846 if (error < 0) { 2847 res = ERR_PTR(error); 2848 goto out; 2849 } 2850 2851 res = nfs4_try_mount(flags, dev_name, data); 2852 if (IS_ERR(res)) 2853 error = PTR_ERR(res); 2854 2855 out: 2856 nfs_free_parsed_mount_data(data); 2857 dprintk("<-- nfs4_mount() = %d%s\n", error, 2858 error != 0 ? " [error]" : ""); 2859 return res; 2860 } 2861 2862 static void nfs4_kill_super(struct super_block *sb) 2863 { 2864 struct nfs_server *server = NFS_SB(sb); 2865 2866 dprintk("--> %s\n", __func__); 2867 nfs_super_return_all_delegations(sb); 2868 kill_anon_super(sb); 2869 nfs_fscache_release_super_cookie(sb); 2870 nfs_free_server(server); 2871 dprintk("<-- %s\n", __func__); 2872 } 2873 2874 /* 2875 * Clone an NFS4 server record on xdev traversal (FSID-change) 2876 */ 2877 static struct dentry * 2878 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2879 const char *dev_name, void *raw_data) 2880 { 2881 struct nfs_clone_mount *data = raw_data; 2882 struct super_block *s; 2883 struct nfs_server *server; 2884 struct dentry *mntroot; 2885 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2886 struct nfs_sb_mountdata sb_mntdata = { 2887 .mntflags = flags, 2888 }; 2889 int error; 2890 2891 dprintk("--> nfs4_xdev_mount()\n"); 2892 2893 /* create a new volume representation */ 2894 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2895 if (IS_ERR(server)) { 2896 error = PTR_ERR(server); 2897 goto out_err_noserver; 2898 } 2899 sb_mntdata.server = server; 2900 2901 if (server->flags & NFS4_MOUNT_UNSHARED) 2902 compare_super = NULL; 2903 2904 /* -o noac implies -o sync */ 2905 if (server->flags & NFS_MOUNT_NOAC) 2906 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2907 2908 /* Get a superblock - note that we may end up sharing one that already exists */ 2909 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2910 if (IS_ERR(s)) { 2911 error = PTR_ERR(s); 2912 goto out_err_nosb; 2913 } 2914 2915 if (s->s_fs_info != server) { 2916 nfs_free_server(server); 2917 server = NULL; 2918 } else { 2919 error = nfs_bdi_register(server); 2920 if (error) 2921 goto error_splat_bdi; 2922 } 2923 2924 if (!s->s_root) { 2925 /* initial superblock/root creation */ 2926 nfs4_clone_super(s, data->sb); 2927 nfs_fscache_get_super_cookie(s, NULL, data); 2928 } 2929 2930 mntroot = nfs4_get_root(s, data->fh, dev_name); 2931 if (IS_ERR(mntroot)) { 2932 error = PTR_ERR(mntroot); 2933 goto error_splat_super; 2934 } 2935 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2936 dput(mntroot); 2937 error = -ESTALE; 2938 goto error_splat_super; 2939 } 2940 2941 s->s_flags |= MS_ACTIVE; 2942 2943 security_sb_clone_mnt_opts(data->sb, s); 2944 2945 dprintk("<-- nfs4_xdev_mount() = 0\n"); 2946 return mntroot; 2947 2948 out_err_nosb: 2949 nfs_free_server(server); 2950 out_err_noserver: 2951 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 2952 return ERR_PTR(error); 2953 2954 error_splat_super: 2955 if (server && !s->s_root) 2956 bdi_unregister(&server->backing_dev_info); 2957 error_splat_bdi: 2958 deactivate_locked_super(s); 2959 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 2960 return ERR_PTR(error); 2961 } 2962 2963 static struct dentry * 2964 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 2965 const char *dev_name, void *raw_data) 2966 { 2967 struct nfs_clone_mount *data = raw_data; 2968 struct super_block *s; 2969 struct nfs_server *server; 2970 struct dentry *mntroot; 2971 struct nfs_fh *mntfh; 2972 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2973 struct nfs_sb_mountdata sb_mntdata = { 2974 .mntflags = flags, 2975 }; 2976 int error = -ENOMEM; 2977 2978 dprintk("--> nfs4_referral_get_sb()\n"); 2979 2980 mntfh = nfs_alloc_fhandle(); 2981 if (mntfh == NULL) 2982 goto out_err_nofh; 2983 2984 /* create a new volume representation */ 2985 server = nfs4_create_referral_server(data, mntfh); 2986 if (IS_ERR(server)) { 2987 error = PTR_ERR(server); 2988 goto out_err_noserver; 2989 } 2990 sb_mntdata.server = server; 2991 2992 if (server->flags & NFS4_MOUNT_UNSHARED) 2993 compare_super = NULL; 2994 2995 /* -o noac implies -o sync */ 2996 if (server->flags & NFS_MOUNT_NOAC) 2997 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2998 2999 /* Get a superblock - note that we may end up sharing one that already exists */ 3000 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3001 if (IS_ERR(s)) { 3002 error = PTR_ERR(s); 3003 goto out_err_nosb; 3004 } 3005 3006 if (s->s_fs_info != server) { 3007 nfs_free_server(server); 3008 server = NULL; 3009 } else { 3010 error = nfs_bdi_register(server); 3011 if (error) 3012 goto error_splat_bdi; 3013 } 3014 3015 if (!s->s_root) { 3016 /* initial superblock/root creation */ 3017 nfs4_fill_super(s); 3018 nfs_fscache_get_super_cookie(s, NULL, data); 3019 } 3020 3021 mntroot = nfs4_get_root(s, mntfh, dev_name); 3022 if (IS_ERR(mntroot)) { 3023 error = PTR_ERR(mntroot); 3024 goto error_splat_super; 3025 } 3026 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3027 dput(mntroot); 3028 error = -ESTALE; 3029 goto error_splat_super; 3030 } 3031 3032 s->s_flags |= MS_ACTIVE; 3033 3034 security_sb_clone_mnt_opts(data->sb, s); 3035 3036 nfs_free_fhandle(mntfh); 3037 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3038 return mntroot; 3039 3040 out_err_nosb: 3041 nfs_free_server(server); 3042 out_err_noserver: 3043 nfs_free_fhandle(mntfh); 3044 out_err_nofh: 3045 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3046 return ERR_PTR(error); 3047 3048 error_splat_super: 3049 if (server && !s->s_root) 3050 bdi_unregister(&server->backing_dev_info); 3051 error_splat_bdi: 3052 deactivate_locked_super(s); 3053 nfs_free_fhandle(mntfh); 3054 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3055 return ERR_PTR(error); 3056 } 3057 3058 /* 3059 * Create an NFS4 server record on referral traversal 3060 */ 3061 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 3062 int flags, const char *dev_name, void *raw_data) 3063 { 3064 struct nfs_clone_mount *data = raw_data; 3065 char *export_path; 3066 struct vfsmount *root_mnt; 3067 struct dentry *res; 3068 3069 dprintk("--> nfs4_referral_mount()\n"); 3070 3071 export_path = data->mnt_path; 3072 data->mnt_path = "/"; 3073 3074 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3075 flags, data, data->hostname); 3076 data->mnt_path = export_path; 3077 3078 res = nfs_follow_remote_path(root_mnt, export_path); 3079 dprintk("<-- nfs4_referral_mount() = %ld%s\n", 3080 IS_ERR(res) ? PTR_ERR(res) : 0, 3081 IS_ERR(res) ? " [error]" : ""); 3082 return res; 3083 } 3084 3085 #endif /* CONFIG_NFS_V4 */ 3086