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/mnt_namespace.h> 45 #include <linux/namei.h> 46 #include <linux/nfs_idmap.h> 47 #include <linux/vfs.h> 48 #include <linux/inet.h> 49 #include <linux/in6.h> 50 #include <linux/slab.h> 51 #include <net/ipv6.h> 52 #include <linux/netdevice.h> 53 #include <linux/nfs_xdr.h> 54 #include <linux/magic.h> 55 #include <linux/parser.h> 56 57 #include <asm/system.h> 58 #include <asm/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 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 vfsmount *); 266 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 267 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 268 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 269 int flags, const char *dev_name, void *raw_data); 270 static void nfs_put_super(struct super_block *); 271 static void nfs_kill_super(struct super_block *); 272 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 273 274 static struct file_system_type nfs_fs_type = { 275 .owner = THIS_MODULE, 276 .name = "nfs", 277 .get_sb = nfs_get_sb, 278 .kill_sb = nfs_kill_super, 279 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 280 }; 281 282 struct file_system_type nfs_xdev_fs_type = { 283 .owner = THIS_MODULE, 284 .name = "nfs", 285 .mount = nfs_xdev_mount, 286 .kill_sb = nfs_kill_super, 287 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 288 }; 289 290 static const struct super_operations nfs_sops = { 291 .alloc_inode = nfs_alloc_inode, 292 .destroy_inode = nfs_destroy_inode, 293 .write_inode = nfs_write_inode, 294 .put_super = nfs_put_super, 295 .statfs = nfs_statfs, 296 .evict_inode = nfs_evict_inode, 297 .umount_begin = nfs_umount_begin, 298 .show_options = nfs_show_options, 299 .show_stats = nfs_show_stats, 300 .remount_fs = nfs_remount, 301 }; 302 303 #ifdef CONFIG_NFS_V4 304 static int nfs4_validate_text_mount_data(void *options, 305 struct nfs_parsed_mount_data *args, const char *dev_name); 306 static int nfs4_try_mount(int flags, const char *dev_name, 307 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 308 static int nfs4_get_sb(struct file_system_type *fs_type, 309 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 310 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 311 int flags, const char *dev_name, void *raw_data); 312 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 313 int flags, const char *dev_name, void *raw_data); 314 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 315 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 316 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 317 int flags, const char *dev_name, void *raw_data); 318 static void nfs4_kill_super(struct super_block *sb); 319 320 static struct file_system_type nfs4_fs_type = { 321 .owner = THIS_MODULE, 322 .name = "nfs4", 323 .get_sb = nfs4_get_sb, 324 .kill_sb = nfs4_kill_super, 325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 326 }; 327 328 static struct file_system_type nfs4_remote_fs_type = { 329 .owner = THIS_MODULE, 330 .name = "nfs4", 331 .mount = nfs4_remote_mount, 332 .kill_sb = nfs4_kill_super, 333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 334 }; 335 336 struct file_system_type nfs4_xdev_fs_type = { 337 .owner = THIS_MODULE, 338 .name = "nfs4", 339 .mount = nfs4_xdev_mount, 340 .kill_sb = nfs4_kill_super, 341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 342 }; 343 344 static struct file_system_type nfs4_remote_referral_fs_type = { 345 .owner = THIS_MODULE, 346 .name = "nfs4", 347 .mount = nfs4_remote_referral_mount, 348 .kill_sb = nfs4_kill_super, 349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 350 }; 351 352 struct file_system_type nfs4_referral_fs_type = { 353 .owner = THIS_MODULE, 354 .name = "nfs4", 355 .get_sb = nfs4_referral_get_sb, 356 .kill_sb = nfs4_kill_super, 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 358 }; 359 360 static const struct super_operations nfs4_sops = { 361 .alloc_inode = nfs_alloc_inode, 362 .destroy_inode = nfs_destroy_inode, 363 .write_inode = nfs_write_inode, 364 .put_super = nfs_put_super, 365 .statfs = nfs_statfs, 366 .evict_inode = nfs4_evict_inode, 367 .umount_begin = nfs_umount_begin, 368 .show_options = nfs_show_options, 369 .show_stats = nfs_show_stats, 370 .remount_fs = nfs_remount, 371 }; 372 #endif 373 374 static struct shrinker acl_shrinker = { 375 .shrink = nfs_access_cache_shrinker, 376 .seeks = DEFAULT_SEEKS, 377 }; 378 379 /* 380 * Register the NFS filesystems 381 */ 382 int __init register_nfs_fs(void) 383 { 384 int ret; 385 386 ret = register_filesystem(&nfs_fs_type); 387 if (ret < 0) 388 goto error_0; 389 390 ret = nfs_register_sysctl(); 391 if (ret < 0) 392 goto error_1; 393 #ifdef CONFIG_NFS_V4 394 ret = register_filesystem(&nfs4_fs_type); 395 if (ret < 0) 396 goto error_2; 397 #endif 398 register_shrinker(&acl_shrinker); 399 return 0; 400 401 #ifdef CONFIG_NFS_V4 402 error_2: 403 nfs_unregister_sysctl(); 404 #endif 405 error_1: 406 unregister_filesystem(&nfs_fs_type); 407 error_0: 408 return ret; 409 } 410 411 /* 412 * Unregister the NFS filesystems 413 */ 414 void __exit unregister_nfs_fs(void) 415 { 416 unregister_shrinker(&acl_shrinker); 417 #ifdef CONFIG_NFS_V4 418 unregister_filesystem(&nfs4_fs_type); 419 #endif 420 nfs_unregister_sysctl(); 421 unregister_filesystem(&nfs_fs_type); 422 } 423 424 void nfs_sb_active(struct super_block *sb) 425 { 426 struct nfs_server *server = NFS_SB(sb); 427 428 if (atomic_inc_return(&server->active) == 1) 429 atomic_inc(&sb->s_active); 430 } 431 432 void nfs_sb_deactive(struct super_block *sb) 433 { 434 struct nfs_server *server = NFS_SB(sb); 435 436 if (atomic_dec_and_test(&server->active)) 437 deactivate_super(sb); 438 } 439 440 /* 441 * Deliver file system statistics to userspace 442 */ 443 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 444 { 445 struct nfs_server *server = NFS_SB(dentry->d_sb); 446 unsigned char blockbits; 447 unsigned long blockres; 448 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 449 struct nfs_fsstat res; 450 int error = -ENOMEM; 451 452 res.fattr = nfs_alloc_fattr(); 453 if (res.fattr == NULL) 454 goto out_err; 455 456 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 457 if (unlikely(error == -ESTALE)) { 458 struct dentry *pd_dentry; 459 460 pd_dentry = dget_parent(dentry); 461 if (pd_dentry != NULL) { 462 nfs_zap_caches(pd_dentry->d_inode); 463 dput(pd_dentry); 464 } 465 } 466 nfs_free_fattr(res.fattr); 467 if (error < 0) 468 goto out_err; 469 470 buf->f_type = NFS_SUPER_MAGIC; 471 472 /* 473 * Current versions of glibc do not correctly handle the 474 * case where f_frsize != f_bsize. Eventually we want to 475 * report the value of wtmult in this field. 476 */ 477 buf->f_frsize = dentry->d_sb->s_blocksize; 478 479 /* 480 * On most *nix systems, f_blocks, f_bfree, and f_bavail 481 * are reported in units of f_frsize. Linux hasn't had 482 * an f_frsize field in its statfs struct until recently, 483 * thus historically Linux's sys_statfs reports these 484 * fields in units of f_bsize. 485 */ 486 buf->f_bsize = dentry->d_sb->s_blocksize; 487 blockbits = dentry->d_sb->s_blocksize_bits; 488 blockres = (1 << blockbits) - 1; 489 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 490 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 491 buf->f_bavail = (res.abytes + blockres) >> blockbits; 492 493 buf->f_files = res.tfiles; 494 buf->f_ffree = res.afiles; 495 496 buf->f_namelen = server->namelen; 497 498 return 0; 499 500 out_err: 501 dprintk("%s: statfs error = %d\n", __func__, -error); 502 return error; 503 } 504 505 /* 506 * Map the security flavour number to a name 507 */ 508 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 509 { 510 static const struct { 511 rpc_authflavor_t flavour; 512 const char *str; 513 } sec_flavours[] = { 514 { RPC_AUTH_NULL, "null" }, 515 { RPC_AUTH_UNIX, "sys" }, 516 { RPC_AUTH_GSS_KRB5, "krb5" }, 517 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 518 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 519 { RPC_AUTH_GSS_LKEY, "lkey" }, 520 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 521 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 522 { RPC_AUTH_GSS_SPKM, "spkm" }, 523 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 524 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 525 { UINT_MAX, "unknown" } 526 }; 527 int i; 528 529 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 530 if (sec_flavours[i].flavour == flavour) 531 break; 532 } 533 return sec_flavours[i].str; 534 } 535 536 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 537 int showdefaults) 538 { 539 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 540 541 seq_printf(m, ",mountproto="); 542 switch (sap->sa_family) { 543 case AF_INET: 544 switch (nfss->mountd_protocol) { 545 case IPPROTO_UDP: 546 seq_printf(m, RPCBIND_NETID_UDP); 547 break; 548 case IPPROTO_TCP: 549 seq_printf(m, RPCBIND_NETID_TCP); 550 break; 551 default: 552 if (showdefaults) 553 seq_printf(m, "auto"); 554 } 555 break; 556 case AF_INET6: 557 switch (nfss->mountd_protocol) { 558 case IPPROTO_UDP: 559 seq_printf(m, RPCBIND_NETID_UDP6); 560 break; 561 case IPPROTO_TCP: 562 seq_printf(m, RPCBIND_NETID_TCP6); 563 break; 564 default: 565 if (showdefaults) 566 seq_printf(m, "auto"); 567 } 568 break; 569 default: 570 if (showdefaults) 571 seq_printf(m, "auto"); 572 } 573 } 574 575 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 576 int showdefaults) 577 { 578 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 579 580 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 581 return; 582 583 switch (sap->sa_family) { 584 case AF_INET: { 585 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 586 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 587 break; 588 } 589 case AF_INET6: { 590 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 591 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 592 break; 593 } 594 default: 595 if (showdefaults) 596 seq_printf(m, ",mountaddr=unspecified"); 597 } 598 599 if (nfss->mountd_version || showdefaults) 600 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 601 if ((nfss->mountd_port && 602 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 603 showdefaults) 604 seq_printf(m, ",mountport=%u", nfss->mountd_port); 605 606 nfs_show_mountd_netid(m, nfss, showdefaults); 607 } 608 609 #ifdef CONFIG_NFS_V4 610 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 611 int showdefaults) 612 { 613 struct nfs_client *clp = nfss->nfs_client; 614 615 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 616 seq_printf(m, ",minorversion=%u", clp->cl_minorversion); 617 } 618 #else 619 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 620 int showdefaults) 621 { 622 } 623 #endif 624 625 /* 626 * Describe the mount options in force on this server representation 627 */ 628 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 629 int showdefaults) 630 { 631 static const struct proc_nfs_info { 632 int flag; 633 const char *str; 634 const char *nostr; 635 } nfs_info[] = { 636 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 637 { NFS_MOUNT_POSIX, ",posix", "" }, 638 { NFS_MOUNT_NOCTO, ",nocto", "" }, 639 { NFS_MOUNT_NOAC, ",noac", "" }, 640 { NFS_MOUNT_NONLM, ",nolock", "" }, 641 { NFS_MOUNT_NOACL, ",noacl", "" }, 642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 645 { 0, NULL, NULL } 646 }; 647 const struct proc_nfs_info *nfs_infop; 648 struct nfs_client *clp = nfss->nfs_client; 649 u32 version = clp->rpc_ops->version; 650 int local_flock, local_fcntl; 651 652 seq_printf(m, ",vers=%u", version); 653 seq_printf(m, ",rsize=%u", nfss->rsize); 654 seq_printf(m, ",wsize=%u", nfss->wsize); 655 if (nfss->bsize != 0) 656 seq_printf(m, ",bsize=%u", nfss->bsize); 657 seq_printf(m, ",namlen=%u", nfss->namelen); 658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 667 if (nfss->flags & nfs_infop->flag) 668 seq_puts(m, nfs_infop->str); 669 else 670 seq_puts(m, nfs_infop->nostr); 671 } 672 seq_printf(m, ",proto=%s", 673 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 674 if (version == 4) { 675 if (nfss->port != NFS_PORT) 676 seq_printf(m, ",port=%u", nfss->port); 677 } else 678 if (nfss->port) 679 seq_printf(m, ",port=%u", nfss->port); 680 681 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 682 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 683 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 684 685 if (version != 4) 686 nfs_show_mountd_options(m, nfss, showdefaults); 687 else 688 nfs_show_nfsv4_options(m, nfss, showdefaults); 689 690 if (nfss->options & NFS_OPTION_FSCACHE) 691 seq_printf(m, ",fsc"); 692 693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 695 seq_printf(m, ",lookupcache=none"); 696 else 697 seq_printf(m, ",lookupcache=pos"); 698 } 699 700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 702 703 if (!local_flock && !local_fcntl) 704 seq_printf(m, ",local_lock=none"); 705 else if (local_flock && local_fcntl) 706 seq_printf(m, ",local_lock=all"); 707 else if (local_flock) 708 seq_printf(m, ",local_lock=flock"); 709 else 710 seq_printf(m, ",local_lock=posix"); 711 } 712 713 /* 714 * Describe the mount options on this VFS mountpoint 715 */ 716 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 717 { 718 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 719 720 nfs_show_mount_options(m, nfss, 0); 721 722 seq_printf(m, ",addr=%s", 723 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 724 RPC_DISPLAY_ADDR)); 725 726 return 0; 727 } 728 729 /* 730 * Present statistical information for this VFS mountpoint 731 */ 732 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 733 { 734 int i, cpu; 735 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 736 struct rpc_auth *auth = nfss->client->cl_auth; 737 struct nfs_iostats totals = { }; 738 739 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 740 741 /* 742 * Display all mount option settings 743 */ 744 seq_printf(m, "\n\topts:\t"); 745 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 746 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 747 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 748 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 749 nfs_show_mount_options(m, nfss, 1); 750 751 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 752 753 seq_printf(m, "\n\tcaps:\t"); 754 seq_printf(m, "caps=0x%x", nfss->caps); 755 seq_printf(m, ",wtmult=%u", nfss->wtmult); 756 seq_printf(m, ",dtsize=%u", nfss->dtsize); 757 seq_printf(m, ",bsize=%u", nfss->bsize); 758 seq_printf(m, ",namlen=%u", nfss->namelen); 759 760 #ifdef CONFIG_NFS_V4 761 if (nfss->nfs_client->rpc_ops->version == 4) { 762 seq_printf(m, "\n\tnfsv4:\t"); 763 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 764 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 765 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 766 } 767 #endif 768 769 /* 770 * Display security flavor in effect for this mount 771 */ 772 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 773 if (auth->au_flavor) 774 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 775 776 /* 777 * Display superblock I/O counters 778 */ 779 for_each_possible_cpu(cpu) { 780 struct nfs_iostats *stats; 781 782 preempt_disable(); 783 stats = per_cpu_ptr(nfss->io_stats, cpu); 784 785 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 786 totals.events[i] += stats->events[i]; 787 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 788 totals.bytes[i] += stats->bytes[i]; 789 #ifdef CONFIG_NFS_FSCACHE 790 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 791 totals.fscache[i] += stats->fscache[i]; 792 #endif 793 794 preempt_enable(); 795 } 796 797 seq_printf(m, "\n\tevents:\t"); 798 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 799 seq_printf(m, "%lu ", totals.events[i]); 800 seq_printf(m, "\n\tbytes:\t"); 801 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 802 seq_printf(m, "%Lu ", totals.bytes[i]); 803 #ifdef CONFIG_NFS_FSCACHE 804 if (nfss->options & NFS_OPTION_FSCACHE) { 805 seq_printf(m, "\n\tfsc:\t"); 806 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 807 seq_printf(m, "%Lu ", totals.bytes[i]); 808 } 809 #endif 810 seq_printf(m, "\n"); 811 812 rpc_print_iostats(m, nfss->client); 813 814 return 0; 815 } 816 817 /* 818 * Begin unmount by attempting to remove all automounted mountpoints we added 819 * in response to xdev traversals and referrals 820 */ 821 static void nfs_umount_begin(struct super_block *sb) 822 { 823 struct nfs_server *server; 824 struct rpc_clnt *rpc; 825 826 server = NFS_SB(sb); 827 /* -EIO all pending I/O */ 828 rpc = server->client_acl; 829 if (!IS_ERR(rpc)) 830 rpc_killall_tasks(rpc); 831 rpc = server->client; 832 if (!IS_ERR(rpc)) 833 rpc_killall_tasks(rpc); 834 } 835 836 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 837 { 838 struct nfs_parsed_mount_data *data; 839 840 data = kzalloc(sizeof(*data), GFP_KERNEL); 841 if (data) { 842 data->acregmin = NFS_DEF_ACREGMIN; 843 data->acregmax = NFS_DEF_ACREGMAX; 844 data->acdirmin = NFS_DEF_ACDIRMIN; 845 data->acdirmax = NFS_DEF_ACDIRMAX; 846 data->mount_server.port = NFS_UNSPEC_PORT; 847 data->nfs_server.port = NFS_UNSPEC_PORT; 848 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 849 data->auth_flavors[0] = RPC_AUTH_UNIX; 850 data->auth_flavor_len = 1; 851 data->version = version; 852 data->minorversion = 0; 853 } 854 return data; 855 } 856 857 /* 858 * Sanity-check a server address provided by the mount command. 859 * 860 * Address family must be initialized, and address must not be 861 * the ANY address for that family. 862 */ 863 static int nfs_verify_server_address(struct sockaddr *addr) 864 { 865 switch (addr->sa_family) { 866 case AF_INET: { 867 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 868 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 869 } 870 case AF_INET6: { 871 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 872 return !ipv6_addr_any(sa); 873 } 874 } 875 876 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 877 return 0; 878 } 879 880 /* 881 * Select between a default port value and a user-specified port value. 882 * If a zero value is set, then autobind will be used. 883 */ 884 static void nfs_set_port(struct sockaddr *sap, int *port, 885 const unsigned short default_port) 886 { 887 if (*port == NFS_UNSPEC_PORT) 888 *port = default_port; 889 890 rpc_set_port(sap, *port); 891 } 892 893 /* 894 * Sanity check the NFS transport protocol. 895 * 896 */ 897 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 898 { 899 switch (mnt->nfs_server.protocol) { 900 case XPRT_TRANSPORT_UDP: 901 case XPRT_TRANSPORT_TCP: 902 case XPRT_TRANSPORT_RDMA: 903 break; 904 default: 905 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 906 } 907 } 908 909 /* 910 * For text based NFSv2/v3 mounts, the mount protocol transport default 911 * settings should depend upon the specified NFS transport. 912 */ 913 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 914 { 915 nfs_validate_transport_protocol(mnt); 916 917 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 918 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 919 return; 920 switch (mnt->nfs_server.protocol) { 921 case XPRT_TRANSPORT_UDP: 922 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 923 break; 924 case XPRT_TRANSPORT_TCP: 925 case XPRT_TRANSPORT_RDMA: 926 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 927 } 928 } 929 930 /* 931 * Parse the value of the 'sec=' option. 932 */ 933 static int nfs_parse_security_flavors(char *value, 934 struct nfs_parsed_mount_data *mnt) 935 { 936 substring_t args[MAX_OPT_ARGS]; 937 938 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 939 940 switch (match_token(value, nfs_secflavor_tokens, args)) { 941 case Opt_sec_none: 942 mnt->auth_flavors[0] = RPC_AUTH_NULL; 943 break; 944 case Opt_sec_sys: 945 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 946 break; 947 case Opt_sec_krb5: 948 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 949 break; 950 case Opt_sec_krb5i: 951 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 952 break; 953 case Opt_sec_krb5p: 954 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 955 break; 956 case Opt_sec_lkey: 957 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 958 break; 959 case Opt_sec_lkeyi: 960 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 961 break; 962 case Opt_sec_lkeyp: 963 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 964 break; 965 case Opt_sec_spkm: 966 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 967 break; 968 case Opt_sec_spkmi: 969 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 970 break; 971 case Opt_sec_spkmp: 972 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 973 break; 974 default: 975 return 0; 976 } 977 978 mnt->auth_flavor_len = 1; 979 return 1; 980 } 981 982 /* 983 * Error-check and convert a string of mount options from user space into 984 * a data structure. The whole mount string is processed; bad options are 985 * skipped as they are encountered. If there were no errors, return 1; 986 * otherwise return 0 (zero). 987 */ 988 static int nfs_parse_mount_options(char *raw, 989 struct nfs_parsed_mount_data *mnt) 990 { 991 char *p, *string, *secdata; 992 int rc, sloppy = 0, invalid_option = 0; 993 unsigned short protofamily = AF_UNSPEC; 994 unsigned short mountfamily = AF_UNSPEC; 995 996 if (!raw) { 997 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 998 return 1; 999 } 1000 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1001 1002 secdata = alloc_secdata(); 1003 if (!secdata) 1004 goto out_nomem; 1005 1006 rc = security_sb_copy_data(raw, secdata); 1007 if (rc) 1008 goto out_security_failure; 1009 1010 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1011 if (rc) 1012 goto out_security_failure; 1013 1014 free_secdata(secdata); 1015 1016 while ((p = strsep(&raw, ",")) != NULL) { 1017 substring_t args[MAX_OPT_ARGS]; 1018 unsigned long option; 1019 int token; 1020 1021 if (!*p) 1022 continue; 1023 1024 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1025 1026 token = match_token(p, nfs_mount_option_tokens, args); 1027 switch (token) { 1028 1029 /* 1030 * boolean options: foo/nofoo 1031 */ 1032 case Opt_soft: 1033 mnt->flags |= NFS_MOUNT_SOFT; 1034 break; 1035 case Opt_hard: 1036 mnt->flags &= ~NFS_MOUNT_SOFT; 1037 break; 1038 case Opt_posix: 1039 mnt->flags |= NFS_MOUNT_POSIX; 1040 break; 1041 case Opt_noposix: 1042 mnt->flags &= ~NFS_MOUNT_POSIX; 1043 break; 1044 case Opt_cto: 1045 mnt->flags &= ~NFS_MOUNT_NOCTO; 1046 break; 1047 case Opt_nocto: 1048 mnt->flags |= NFS_MOUNT_NOCTO; 1049 break; 1050 case Opt_ac: 1051 mnt->flags &= ~NFS_MOUNT_NOAC; 1052 break; 1053 case Opt_noac: 1054 mnt->flags |= NFS_MOUNT_NOAC; 1055 break; 1056 case Opt_lock: 1057 mnt->flags &= ~NFS_MOUNT_NONLM; 1058 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1059 NFS_MOUNT_LOCAL_FCNTL); 1060 break; 1061 case Opt_nolock: 1062 mnt->flags |= NFS_MOUNT_NONLM; 1063 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1064 NFS_MOUNT_LOCAL_FCNTL); 1065 break; 1066 case Opt_v2: 1067 mnt->flags &= ~NFS_MOUNT_VER3; 1068 mnt->version = 2; 1069 break; 1070 case Opt_v3: 1071 mnt->flags |= NFS_MOUNT_VER3; 1072 mnt->version = 3; 1073 break; 1074 case Opt_v4: 1075 mnt->flags &= ~NFS_MOUNT_VER3; 1076 mnt->version = 4; 1077 break; 1078 case Opt_udp: 1079 mnt->flags &= ~NFS_MOUNT_TCP; 1080 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1081 break; 1082 case Opt_tcp: 1083 mnt->flags |= NFS_MOUNT_TCP; 1084 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1085 break; 1086 case Opt_rdma: 1087 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1088 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1089 xprt_load_transport(p); 1090 break; 1091 case Opt_acl: 1092 mnt->flags &= ~NFS_MOUNT_NOACL; 1093 break; 1094 case Opt_noacl: 1095 mnt->flags |= NFS_MOUNT_NOACL; 1096 break; 1097 case Opt_rdirplus: 1098 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1099 break; 1100 case Opt_nordirplus: 1101 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1102 break; 1103 case Opt_sharecache: 1104 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1105 break; 1106 case Opt_nosharecache: 1107 mnt->flags |= NFS_MOUNT_UNSHARED; 1108 break; 1109 case Opt_resvport: 1110 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1111 break; 1112 case Opt_noresvport: 1113 mnt->flags |= NFS_MOUNT_NORESVPORT; 1114 break; 1115 case Opt_fscache: 1116 mnt->options |= NFS_OPTION_FSCACHE; 1117 kfree(mnt->fscache_uniq); 1118 mnt->fscache_uniq = NULL; 1119 break; 1120 case Opt_nofscache: 1121 mnt->options &= ~NFS_OPTION_FSCACHE; 1122 kfree(mnt->fscache_uniq); 1123 mnt->fscache_uniq = NULL; 1124 break; 1125 1126 /* 1127 * options that take numeric values 1128 */ 1129 case Opt_port: 1130 string = match_strdup(args); 1131 if (string == NULL) 1132 goto out_nomem; 1133 rc = strict_strtoul(string, 10, &option); 1134 kfree(string); 1135 if (rc != 0 || option > USHRT_MAX) 1136 goto out_invalid_value; 1137 mnt->nfs_server.port = option; 1138 break; 1139 case Opt_rsize: 1140 string = match_strdup(args); 1141 if (string == NULL) 1142 goto out_nomem; 1143 rc = strict_strtoul(string, 10, &option); 1144 kfree(string); 1145 if (rc != 0) 1146 goto out_invalid_value; 1147 mnt->rsize = option; 1148 break; 1149 case Opt_wsize: 1150 string = match_strdup(args); 1151 if (string == NULL) 1152 goto out_nomem; 1153 rc = strict_strtoul(string, 10, &option); 1154 kfree(string); 1155 if (rc != 0) 1156 goto out_invalid_value; 1157 mnt->wsize = option; 1158 break; 1159 case Opt_bsize: 1160 string = match_strdup(args); 1161 if (string == NULL) 1162 goto out_nomem; 1163 rc = strict_strtoul(string, 10, &option); 1164 kfree(string); 1165 if (rc != 0) 1166 goto out_invalid_value; 1167 mnt->bsize = option; 1168 break; 1169 case Opt_timeo: 1170 string = match_strdup(args); 1171 if (string == NULL) 1172 goto out_nomem; 1173 rc = strict_strtoul(string, 10, &option); 1174 kfree(string); 1175 if (rc != 0 || option == 0) 1176 goto out_invalid_value; 1177 mnt->timeo = option; 1178 break; 1179 case Opt_retrans: 1180 string = match_strdup(args); 1181 if (string == NULL) 1182 goto out_nomem; 1183 rc = strict_strtoul(string, 10, &option); 1184 kfree(string); 1185 if (rc != 0 || option == 0) 1186 goto out_invalid_value; 1187 mnt->retrans = option; 1188 break; 1189 case Opt_acregmin: 1190 string = match_strdup(args); 1191 if (string == NULL) 1192 goto out_nomem; 1193 rc = strict_strtoul(string, 10, &option); 1194 kfree(string); 1195 if (rc != 0) 1196 goto out_invalid_value; 1197 mnt->acregmin = option; 1198 break; 1199 case Opt_acregmax: 1200 string = match_strdup(args); 1201 if (string == NULL) 1202 goto out_nomem; 1203 rc = strict_strtoul(string, 10, &option); 1204 kfree(string); 1205 if (rc != 0) 1206 goto out_invalid_value; 1207 mnt->acregmax = option; 1208 break; 1209 case Opt_acdirmin: 1210 string = match_strdup(args); 1211 if (string == NULL) 1212 goto out_nomem; 1213 rc = strict_strtoul(string, 10, &option); 1214 kfree(string); 1215 if (rc != 0) 1216 goto out_invalid_value; 1217 mnt->acdirmin = option; 1218 break; 1219 case Opt_acdirmax: 1220 string = match_strdup(args); 1221 if (string == NULL) 1222 goto out_nomem; 1223 rc = strict_strtoul(string, 10, &option); 1224 kfree(string); 1225 if (rc != 0) 1226 goto out_invalid_value; 1227 mnt->acdirmax = option; 1228 break; 1229 case Opt_actimeo: 1230 string = match_strdup(args); 1231 if (string == NULL) 1232 goto out_nomem; 1233 rc = strict_strtoul(string, 10, &option); 1234 kfree(string); 1235 if (rc != 0) 1236 goto out_invalid_value; 1237 mnt->acregmin = mnt->acregmax = 1238 mnt->acdirmin = mnt->acdirmax = option; 1239 break; 1240 case Opt_namelen: 1241 string = match_strdup(args); 1242 if (string == NULL) 1243 goto out_nomem; 1244 rc = strict_strtoul(string, 10, &option); 1245 kfree(string); 1246 if (rc != 0) 1247 goto out_invalid_value; 1248 mnt->namlen = option; 1249 break; 1250 case Opt_mountport: 1251 string = match_strdup(args); 1252 if (string == NULL) 1253 goto out_nomem; 1254 rc = strict_strtoul(string, 10, &option); 1255 kfree(string); 1256 if (rc != 0 || option > USHRT_MAX) 1257 goto out_invalid_value; 1258 mnt->mount_server.port = option; 1259 break; 1260 case Opt_mountvers: 1261 string = match_strdup(args); 1262 if (string == NULL) 1263 goto out_nomem; 1264 rc = strict_strtoul(string, 10, &option); 1265 kfree(string); 1266 if (rc != 0 || 1267 option < NFS_MNT_VERSION || 1268 option > NFS_MNT3_VERSION) 1269 goto out_invalid_value; 1270 mnt->mount_server.version = option; 1271 break; 1272 case Opt_nfsvers: 1273 string = match_strdup(args); 1274 if (string == NULL) 1275 goto out_nomem; 1276 rc = strict_strtoul(string, 10, &option); 1277 kfree(string); 1278 if (rc != 0) 1279 goto out_invalid_value; 1280 switch (option) { 1281 case NFS2_VERSION: 1282 mnt->flags &= ~NFS_MOUNT_VER3; 1283 mnt->version = 2; 1284 break; 1285 case NFS3_VERSION: 1286 mnt->flags |= NFS_MOUNT_VER3; 1287 mnt->version = 3; 1288 break; 1289 case NFS4_VERSION: 1290 mnt->flags &= ~NFS_MOUNT_VER3; 1291 mnt->version = 4; 1292 break; 1293 default: 1294 goto out_invalid_value; 1295 } 1296 break; 1297 case Opt_minorversion: 1298 string = match_strdup(args); 1299 if (string == NULL) 1300 goto out_nomem; 1301 rc = strict_strtoul(string, 10, &option); 1302 kfree(string); 1303 if (rc != 0) 1304 goto out_invalid_value; 1305 if (option > NFS4_MAX_MINOR_VERSION) 1306 goto out_invalid_value; 1307 mnt->minorversion = option; 1308 break; 1309 1310 /* 1311 * options that take text values 1312 */ 1313 case Opt_sec: 1314 string = match_strdup(args); 1315 if (string == NULL) 1316 goto out_nomem; 1317 rc = nfs_parse_security_flavors(string, mnt); 1318 kfree(string); 1319 if (!rc) { 1320 dfprintk(MOUNT, "NFS: unrecognized " 1321 "security flavor\n"); 1322 return 0; 1323 } 1324 break; 1325 case Opt_proto: 1326 string = match_strdup(args); 1327 if (string == NULL) 1328 goto out_nomem; 1329 token = match_token(string, 1330 nfs_xprt_protocol_tokens, args); 1331 1332 protofamily = AF_INET; 1333 switch (token) { 1334 case Opt_xprt_udp6: 1335 protofamily = AF_INET6; 1336 case Opt_xprt_udp: 1337 mnt->flags &= ~NFS_MOUNT_TCP; 1338 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1339 kfree(string); 1340 break; 1341 case Opt_xprt_tcp6: 1342 protofamily = AF_INET6; 1343 case Opt_xprt_tcp: 1344 mnt->flags |= NFS_MOUNT_TCP; 1345 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1346 kfree(string); 1347 break; 1348 case Opt_xprt_rdma: 1349 /* vector side protocols to TCP */ 1350 mnt->flags |= NFS_MOUNT_TCP; 1351 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1352 xprt_load_transport(string); 1353 kfree(string); 1354 break; 1355 default: 1356 dfprintk(MOUNT, "NFS: unrecognized " 1357 "transport protocol\n"); 1358 kfree(string); 1359 return 0; 1360 } 1361 break; 1362 case Opt_mountproto: 1363 string = match_strdup(args); 1364 if (string == NULL) 1365 goto out_nomem; 1366 token = match_token(string, 1367 nfs_xprt_protocol_tokens, args); 1368 kfree(string); 1369 1370 mountfamily = AF_INET; 1371 switch (token) { 1372 case Opt_xprt_udp6: 1373 mountfamily = AF_INET6; 1374 case Opt_xprt_udp: 1375 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1376 break; 1377 case Opt_xprt_tcp6: 1378 mountfamily = AF_INET6; 1379 case Opt_xprt_tcp: 1380 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1381 break; 1382 case Opt_xprt_rdma: /* not used for side protocols */ 1383 default: 1384 dfprintk(MOUNT, "NFS: unrecognized " 1385 "transport protocol\n"); 1386 return 0; 1387 } 1388 break; 1389 case Opt_addr: 1390 string = match_strdup(args); 1391 if (string == NULL) 1392 goto out_nomem; 1393 mnt->nfs_server.addrlen = 1394 rpc_pton(string, strlen(string), 1395 (struct sockaddr *) 1396 &mnt->nfs_server.address, 1397 sizeof(mnt->nfs_server.address)); 1398 kfree(string); 1399 if (mnt->nfs_server.addrlen == 0) 1400 goto out_invalid_address; 1401 break; 1402 case Opt_clientaddr: 1403 string = match_strdup(args); 1404 if (string == NULL) 1405 goto out_nomem; 1406 kfree(mnt->client_address); 1407 mnt->client_address = string; 1408 break; 1409 case Opt_mounthost: 1410 string = match_strdup(args); 1411 if (string == NULL) 1412 goto out_nomem; 1413 kfree(mnt->mount_server.hostname); 1414 mnt->mount_server.hostname = string; 1415 break; 1416 case Opt_mountaddr: 1417 string = match_strdup(args); 1418 if (string == NULL) 1419 goto out_nomem; 1420 mnt->mount_server.addrlen = 1421 rpc_pton(string, strlen(string), 1422 (struct sockaddr *) 1423 &mnt->mount_server.address, 1424 sizeof(mnt->mount_server.address)); 1425 kfree(string); 1426 if (mnt->mount_server.addrlen == 0) 1427 goto out_invalid_address; 1428 break; 1429 case Opt_lookupcache: 1430 string = match_strdup(args); 1431 if (string == NULL) 1432 goto out_nomem; 1433 token = match_token(string, 1434 nfs_lookupcache_tokens, args); 1435 kfree(string); 1436 switch (token) { 1437 case Opt_lookupcache_all: 1438 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1439 break; 1440 case Opt_lookupcache_positive: 1441 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1443 break; 1444 case Opt_lookupcache_none: 1445 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1446 break; 1447 default: 1448 dfprintk(MOUNT, "NFS: invalid " 1449 "lookupcache argument\n"); 1450 return 0; 1451 }; 1452 break; 1453 case Opt_fscache_uniq: 1454 string = match_strdup(args); 1455 if (string == NULL) 1456 goto out_nomem; 1457 kfree(mnt->fscache_uniq); 1458 mnt->fscache_uniq = string; 1459 mnt->options |= NFS_OPTION_FSCACHE; 1460 break; 1461 case Opt_local_lock: 1462 string = match_strdup(args); 1463 if (string == NULL) 1464 goto out_nomem; 1465 token = match_token(string, nfs_local_lock_tokens, 1466 args); 1467 kfree(string); 1468 switch (token) { 1469 case Opt_local_lock_all: 1470 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1471 NFS_MOUNT_LOCAL_FCNTL); 1472 break; 1473 case Opt_local_lock_flock: 1474 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1475 break; 1476 case Opt_local_lock_posix: 1477 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1478 break; 1479 case Opt_local_lock_none: 1480 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1481 NFS_MOUNT_LOCAL_FCNTL); 1482 break; 1483 default: 1484 dfprintk(MOUNT, "NFS: invalid " 1485 "local_lock argument\n"); 1486 return 0; 1487 }; 1488 break; 1489 1490 /* 1491 * Special options 1492 */ 1493 case Opt_sloppy: 1494 sloppy = 1; 1495 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1496 break; 1497 case Opt_userspace: 1498 case Opt_deprecated: 1499 dfprintk(MOUNT, "NFS: ignoring mount option " 1500 "'%s'\n", p); 1501 break; 1502 1503 default: 1504 invalid_option = 1; 1505 dfprintk(MOUNT, "NFS: unrecognized mount option " 1506 "'%s'\n", p); 1507 } 1508 } 1509 1510 if (!sloppy && invalid_option) 1511 return 0; 1512 1513 /* 1514 * verify that any proto=/mountproto= options match the address 1515 * familiies in the addr=/mountaddr= options. 1516 */ 1517 if (protofamily != AF_UNSPEC && 1518 protofamily != mnt->nfs_server.address.ss_family) 1519 goto out_proto_mismatch; 1520 1521 if (mountfamily != AF_UNSPEC) { 1522 if (mnt->mount_server.addrlen) { 1523 if (mountfamily != mnt->mount_server.address.ss_family) 1524 goto out_mountproto_mismatch; 1525 } else { 1526 if (mountfamily != mnt->nfs_server.address.ss_family) 1527 goto out_mountproto_mismatch; 1528 } 1529 } 1530 1531 return 1; 1532 1533 out_mountproto_mismatch: 1534 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1535 "option\n"); 1536 return 0; 1537 out_proto_mismatch: 1538 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1539 return 0; 1540 out_invalid_address: 1541 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1542 return 0; 1543 out_invalid_value: 1544 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1545 return 0; 1546 out_nomem: 1547 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1548 return 0; 1549 out_security_failure: 1550 free_secdata(secdata); 1551 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1552 return 0; 1553 } 1554 1555 /* 1556 * Match the requested auth flavors with the list returned by 1557 * the server. Returns zero and sets the mount's authentication 1558 * flavor on success; returns -EACCES if server does not support 1559 * the requested flavor. 1560 */ 1561 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1562 struct nfs_mount_request *request) 1563 { 1564 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1565 1566 /* 1567 * Certain releases of Linux's mountd return an empty 1568 * flavor list. To prevent behavioral regression with 1569 * these servers (ie. rejecting mounts that used to 1570 * succeed), revert to pre-2.6.32 behavior (no checking) 1571 * if the returned flavor list is empty. 1572 */ 1573 if (server_authlist_len == 0) 1574 return 0; 1575 1576 /* 1577 * We avoid sophisticated negotiating here, as there are 1578 * plenty of cases where we can get it wrong, providing 1579 * either too little or too much security. 1580 * 1581 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1582 * flavor listed first. However, some servers list 1583 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1584 * preferred default, in args->auth_flavors[0] if user 1585 * didn't specify sec= mount option. 1586 */ 1587 for (i = 0; i < args->auth_flavor_len; i++) 1588 for (j = 0; j < server_authlist_len; j++) 1589 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1590 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1591 request->auth_flavs[j]); 1592 args->auth_flavors[0] = request->auth_flavs[j]; 1593 return 0; 1594 } 1595 1596 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1597 nfs_umount(request); 1598 return -EACCES; 1599 } 1600 1601 /* 1602 * Use the remote server's MOUNT service to request the NFS file handle 1603 * corresponding to the provided path. 1604 */ 1605 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1606 struct nfs_fh *root_fh) 1607 { 1608 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1609 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1610 struct nfs_mount_request request = { 1611 .sap = (struct sockaddr *) 1612 &args->mount_server.address, 1613 .dirpath = args->nfs_server.export_path, 1614 .protocol = args->mount_server.protocol, 1615 .fh = root_fh, 1616 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1617 .auth_flav_len = &server_authlist_len, 1618 .auth_flavs = server_authlist, 1619 }; 1620 int status; 1621 1622 if (args->mount_server.version == 0) { 1623 switch (args->version) { 1624 default: 1625 args->mount_server.version = NFS_MNT3_VERSION; 1626 break; 1627 case 2: 1628 args->mount_server.version = NFS_MNT_VERSION; 1629 } 1630 } 1631 request.version = args->mount_server.version; 1632 1633 if (args->mount_server.hostname) 1634 request.hostname = args->mount_server.hostname; 1635 else 1636 request.hostname = args->nfs_server.hostname; 1637 1638 /* 1639 * Construct the mount server's address. 1640 */ 1641 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1642 memcpy(request.sap, &args->nfs_server.address, 1643 args->nfs_server.addrlen); 1644 args->mount_server.addrlen = args->nfs_server.addrlen; 1645 } 1646 request.salen = args->mount_server.addrlen; 1647 nfs_set_port(request.sap, &args->mount_server.port, 0); 1648 1649 /* 1650 * Now ask the mount server to map our export path 1651 * to a file handle. 1652 */ 1653 status = nfs_mount(&request); 1654 if (status != 0) { 1655 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1656 request.hostname, status); 1657 return status; 1658 } 1659 1660 /* 1661 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1662 */ 1663 if (args->mount_server.version != NFS_MNT3_VERSION) 1664 return 0; 1665 return nfs_walk_authlist(args, &request); 1666 } 1667 1668 static int nfs_parse_simple_hostname(const char *dev_name, 1669 char **hostname, size_t maxnamlen, 1670 char **export_path, size_t maxpathlen) 1671 { 1672 size_t len; 1673 char *colon, *comma; 1674 1675 colon = strchr(dev_name, ':'); 1676 if (colon == NULL) 1677 goto out_bad_devname; 1678 1679 len = colon - dev_name; 1680 if (len > maxnamlen) 1681 goto out_hostname; 1682 1683 /* N.B. caller will free nfs_server.hostname in all cases */ 1684 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1685 if (!*hostname) 1686 goto out_nomem; 1687 1688 /* kill possible hostname list: not supported */ 1689 comma = strchr(*hostname, ','); 1690 if (comma != NULL) { 1691 if (comma == *hostname) 1692 goto out_bad_devname; 1693 *comma = '\0'; 1694 } 1695 1696 colon++; 1697 len = strlen(colon); 1698 if (len > maxpathlen) 1699 goto out_path; 1700 *export_path = kstrndup(colon, len, GFP_KERNEL); 1701 if (!*export_path) 1702 goto out_nomem; 1703 1704 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1705 return 0; 1706 1707 out_bad_devname: 1708 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1709 return -EINVAL; 1710 1711 out_nomem: 1712 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1713 return -ENOMEM; 1714 1715 out_hostname: 1716 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1717 return -ENAMETOOLONG; 1718 1719 out_path: 1720 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1721 return -ENAMETOOLONG; 1722 } 1723 1724 /* 1725 * Hostname has square brackets around it because it contains one or 1726 * more colons. We look for the first closing square bracket, and a 1727 * colon must follow it. 1728 */ 1729 static int nfs_parse_protected_hostname(const char *dev_name, 1730 char **hostname, size_t maxnamlen, 1731 char **export_path, size_t maxpathlen) 1732 { 1733 size_t len; 1734 char *start, *end; 1735 1736 start = (char *)(dev_name + 1); 1737 1738 end = strchr(start, ']'); 1739 if (end == NULL) 1740 goto out_bad_devname; 1741 if (*(end + 1) != ':') 1742 goto out_bad_devname; 1743 1744 len = end - start; 1745 if (len > maxnamlen) 1746 goto out_hostname; 1747 1748 /* N.B. caller will free nfs_server.hostname in all cases */ 1749 *hostname = kstrndup(start, len, GFP_KERNEL); 1750 if (*hostname == NULL) 1751 goto out_nomem; 1752 1753 end += 2; 1754 len = strlen(end); 1755 if (len > maxpathlen) 1756 goto out_path; 1757 *export_path = kstrndup(end, len, GFP_KERNEL); 1758 if (!*export_path) 1759 goto out_nomem; 1760 1761 return 0; 1762 1763 out_bad_devname: 1764 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1765 return -EINVAL; 1766 1767 out_nomem: 1768 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1769 return -ENOMEM; 1770 1771 out_hostname: 1772 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1773 return -ENAMETOOLONG; 1774 1775 out_path: 1776 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1777 return -ENAMETOOLONG; 1778 } 1779 1780 /* 1781 * Split "dev_name" into "hostname:export_path". 1782 * 1783 * The leftmost colon demarks the split between the server's hostname 1784 * and the export path. If the hostname starts with a left square 1785 * bracket, then it may contain colons. 1786 * 1787 * Note: caller frees hostname and export path, even on error. 1788 */ 1789 static int nfs_parse_devname(const char *dev_name, 1790 char **hostname, size_t maxnamlen, 1791 char **export_path, size_t maxpathlen) 1792 { 1793 if (*dev_name == '[') 1794 return nfs_parse_protected_hostname(dev_name, 1795 hostname, maxnamlen, 1796 export_path, maxpathlen); 1797 1798 return nfs_parse_simple_hostname(dev_name, 1799 hostname, maxnamlen, 1800 export_path, maxpathlen); 1801 } 1802 1803 /* 1804 * Validate the NFS2/NFS3 mount data 1805 * - fills in the mount root filehandle 1806 * 1807 * For option strings, user space handles the following behaviors: 1808 * 1809 * + DNS: mapping server host name to IP address ("addr=" option) 1810 * 1811 * + failure mode: how to behave if a mount request can't be handled 1812 * immediately ("fg/bg" option) 1813 * 1814 * + retry: how often to retry a mount request ("retry=" option) 1815 * 1816 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1817 * mountproto=tcp after mountproto=udp, and so on 1818 */ 1819 static int nfs_validate_mount_data(void *options, 1820 struct nfs_parsed_mount_data *args, 1821 struct nfs_fh *mntfh, 1822 const char *dev_name) 1823 { 1824 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1825 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1826 1827 if (data == NULL) 1828 goto out_no_data; 1829 1830 switch (data->version) { 1831 case 1: 1832 data->namlen = 0; 1833 case 2: 1834 data->bsize = 0; 1835 case 3: 1836 if (data->flags & NFS_MOUNT_VER3) 1837 goto out_no_v3; 1838 data->root.size = NFS2_FHSIZE; 1839 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1840 case 4: 1841 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1842 goto out_no_sec; 1843 case 5: 1844 memset(data->context, 0, sizeof(data->context)); 1845 case 6: 1846 if (data->flags & NFS_MOUNT_VER3) { 1847 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1848 goto out_invalid_fh; 1849 mntfh->size = data->root.size; 1850 args->version = 3; 1851 } else { 1852 mntfh->size = NFS2_FHSIZE; 1853 args->version = 2; 1854 } 1855 1856 1857 memcpy(mntfh->data, data->root.data, mntfh->size); 1858 if (mntfh->size < sizeof(mntfh->data)) 1859 memset(mntfh->data + mntfh->size, 0, 1860 sizeof(mntfh->data) - mntfh->size); 1861 1862 /* 1863 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1864 * can deal with. 1865 */ 1866 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1867 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1868 args->rsize = data->rsize; 1869 args->wsize = data->wsize; 1870 args->timeo = data->timeo; 1871 args->retrans = data->retrans; 1872 args->acregmin = data->acregmin; 1873 args->acregmax = data->acregmax; 1874 args->acdirmin = data->acdirmin; 1875 args->acdirmax = data->acdirmax; 1876 1877 memcpy(sap, &data->addr, sizeof(data->addr)); 1878 args->nfs_server.addrlen = sizeof(data->addr); 1879 if (!nfs_verify_server_address(sap)) 1880 goto out_no_address; 1881 1882 if (!(data->flags & NFS_MOUNT_TCP)) 1883 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1884 /* N.B. caller will free nfs_server.hostname in all cases */ 1885 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1886 args->namlen = data->namlen; 1887 args->bsize = data->bsize; 1888 1889 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1890 args->auth_flavors[0] = data->pseudoflavor; 1891 if (!args->nfs_server.hostname) 1892 goto out_nomem; 1893 1894 if (!(data->flags & NFS_MOUNT_NONLM)) 1895 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1896 NFS_MOUNT_LOCAL_FCNTL); 1897 else 1898 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1899 NFS_MOUNT_LOCAL_FCNTL); 1900 /* 1901 * The legacy version 6 binary mount data from userspace has a 1902 * field used only to transport selinux information into the 1903 * the kernel. To continue to support that functionality we 1904 * have a touch of selinux knowledge here in the NFS code. The 1905 * userspace code converted context=blah to just blah so we are 1906 * converting back to the full string selinux understands. 1907 */ 1908 if (data->context[0]){ 1909 #ifdef CONFIG_SECURITY_SELINUX 1910 int rc; 1911 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1912 if (!opts_str) 1913 return -ENOMEM; 1914 strcpy(opts_str, "context="); 1915 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1916 strcat(opts_str, &data->context[0]); 1917 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1918 kfree(opts_str); 1919 if (rc) 1920 return rc; 1921 #else 1922 return -EINVAL; 1923 #endif 1924 } 1925 1926 break; 1927 default: { 1928 int status; 1929 1930 if (nfs_parse_mount_options((char *)options, args) == 0) 1931 return -EINVAL; 1932 1933 if (!nfs_verify_server_address(sap)) 1934 goto out_no_address; 1935 1936 if (args->version == 4) 1937 #ifdef CONFIG_NFS_V4 1938 return nfs4_validate_text_mount_data(options, 1939 args, dev_name); 1940 #else 1941 goto out_v4_not_compiled; 1942 #endif 1943 1944 nfs_set_port(sap, &args->nfs_server.port, 0); 1945 1946 nfs_set_mount_transport_protocol(args); 1947 1948 status = nfs_parse_devname(dev_name, 1949 &args->nfs_server.hostname, 1950 PAGE_SIZE, 1951 &args->nfs_server.export_path, 1952 NFS_MAXPATHLEN); 1953 if (!status) 1954 status = nfs_try_mount(args, mntfh); 1955 1956 kfree(args->nfs_server.export_path); 1957 args->nfs_server.export_path = NULL; 1958 1959 if (status) 1960 return status; 1961 1962 break; 1963 } 1964 } 1965 1966 #ifndef CONFIG_NFS_V3 1967 if (args->version == 3) 1968 goto out_v3_not_compiled; 1969 #endif /* !CONFIG_NFS_V3 */ 1970 1971 return 0; 1972 1973 out_no_data: 1974 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1975 return -EINVAL; 1976 1977 out_no_v3: 1978 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1979 data->version); 1980 return -EINVAL; 1981 1982 out_no_sec: 1983 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1984 return -EINVAL; 1985 1986 #ifndef CONFIG_NFS_V3 1987 out_v3_not_compiled: 1988 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1989 return -EPROTONOSUPPORT; 1990 #endif /* !CONFIG_NFS_V3 */ 1991 1992 #ifndef CONFIG_NFS_V4 1993 out_v4_not_compiled: 1994 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1995 return -EPROTONOSUPPORT; 1996 #endif /* !CONFIG_NFS_V4 */ 1997 1998 out_nomem: 1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2000 return -ENOMEM; 2001 2002 out_no_address: 2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2004 return -EINVAL; 2005 2006 out_invalid_fh: 2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2008 return -EINVAL; 2009 } 2010 2011 static int 2012 nfs_compare_remount_data(struct nfs_server *nfss, 2013 struct nfs_parsed_mount_data *data) 2014 { 2015 if (data->flags != nfss->flags || 2016 data->rsize != nfss->rsize || 2017 data->wsize != nfss->wsize || 2018 data->retrans != nfss->client->cl_timeout->to_retries || 2019 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2020 data->acregmin != nfss->acregmin / HZ || 2021 data->acregmax != nfss->acregmax / HZ || 2022 data->acdirmin != nfss->acdirmin / HZ || 2023 data->acdirmax != nfss->acdirmax / HZ || 2024 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2025 data->nfs_server.port != nfss->port || 2026 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2027 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2028 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2029 return -EINVAL; 2030 2031 return 0; 2032 } 2033 2034 static int 2035 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2036 { 2037 int error; 2038 struct nfs_server *nfss = sb->s_fs_info; 2039 struct nfs_parsed_mount_data *data; 2040 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2041 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2042 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2043 2044 /* 2045 * Userspace mount programs that send binary options generally send 2046 * them populated with default values. We have no way to know which 2047 * ones were explicitly specified. Fall back to legacy behavior and 2048 * just return success. 2049 */ 2050 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2051 (nfsvers <= 3 && (!options || (options->version >= 1 && 2052 options->version <= 6)))) 2053 return 0; 2054 2055 data = kzalloc(sizeof(*data), GFP_KERNEL); 2056 if (data == NULL) 2057 return -ENOMEM; 2058 2059 /* fill out struct with values from existing mount */ 2060 data->flags = nfss->flags; 2061 data->rsize = nfss->rsize; 2062 data->wsize = nfss->wsize; 2063 data->retrans = nfss->client->cl_timeout->to_retries; 2064 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2065 data->acregmin = nfss->acregmin / HZ; 2066 data->acregmax = nfss->acregmax / HZ; 2067 data->acdirmin = nfss->acdirmin / HZ; 2068 data->acdirmax = nfss->acdirmax / HZ; 2069 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2070 data->nfs_server.port = nfss->port; 2071 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2072 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2073 data->nfs_server.addrlen); 2074 2075 /* overwrite those values with any that were specified */ 2076 error = nfs_parse_mount_options((char *)options, data); 2077 if (error < 0) 2078 goto out; 2079 2080 /* compare new mount options with old ones */ 2081 error = nfs_compare_remount_data(nfss, data); 2082 out: 2083 kfree(data); 2084 return error; 2085 } 2086 2087 /* 2088 * Initialise the common bits of the superblock 2089 */ 2090 static inline void nfs_initialise_sb(struct super_block *sb) 2091 { 2092 struct nfs_server *server = NFS_SB(sb); 2093 2094 sb->s_magic = NFS_SUPER_MAGIC; 2095 2096 /* We probably want something more informative here */ 2097 snprintf(sb->s_id, sizeof(sb->s_id), 2098 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2099 2100 if (sb->s_blocksize == 0) 2101 sb->s_blocksize = nfs_block_bits(server->wsize, 2102 &sb->s_blocksize_bits); 2103 2104 if (server->flags & NFS_MOUNT_NOAC) 2105 sb->s_flags |= MS_SYNCHRONOUS; 2106 2107 sb->s_bdi = &server->backing_dev_info; 2108 2109 nfs_super_set_maxbytes(sb, server->maxfilesize); 2110 } 2111 2112 /* 2113 * Finish setting up an NFS2/3 superblock 2114 */ 2115 static void nfs_fill_super(struct super_block *sb, 2116 struct nfs_parsed_mount_data *data) 2117 { 2118 struct nfs_server *server = NFS_SB(sb); 2119 2120 sb->s_blocksize_bits = 0; 2121 sb->s_blocksize = 0; 2122 if (data->bsize) 2123 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2124 2125 if (server->nfs_client->rpc_ops->version == 3) { 2126 /* The VFS shouldn't apply the umask to mode bits. We will do 2127 * so ourselves when necessary. 2128 */ 2129 sb->s_flags |= MS_POSIXACL; 2130 sb->s_time_gran = 1; 2131 } 2132 2133 sb->s_op = &nfs_sops; 2134 nfs_initialise_sb(sb); 2135 } 2136 2137 /* 2138 * Finish setting up a cloned NFS2/3 superblock 2139 */ 2140 static void nfs_clone_super(struct super_block *sb, 2141 const struct super_block *old_sb) 2142 { 2143 struct nfs_server *server = NFS_SB(sb); 2144 2145 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2146 sb->s_blocksize = old_sb->s_blocksize; 2147 sb->s_maxbytes = old_sb->s_maxbytes; 2148 2149 if (server->nfs_client->rpc_ops->version == 3) { 2150 /* The VFS shouldn't apply the umask to mode bits. We will do 2151 * so ourselves when necessary. 2152 */ 2153 sb->s_flags |= MS_POSIXACL; 2154 sb->s_time_gran = 1; 2155 } 2156 2157 sb->s_op = old_sb->s_op; 2158 nfs_initialise_sb(sb); 2159 } 2160 2161 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2162 { 2163 const struct nfs_server *a = s->s_fs_info; 2164 const struct rpc_clnt *clnt_a = a->client; 2165 const struct rpc_clnt *clnt_b = b->client; 2166 2167 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2168 goto Ebusy; 2169 if (a->nfs_client != b->nfs_client) 2170 goto Ebusy; 2171 if (a->flags != b->flags) 2172 goto Ebusy; 2173 if (a->wsize != b->wsize) 2174 goto Ebusy; 2175 if (a->rsize != b->rsize) 2176 goto Ebusy; 2177 if (a->acregmin != b->acregmin) 2178 goto Ebusy; 2179 if (a->acregmax != b->acregmax) 2180 goto Ebusy; 2181 if (a->acdirmin != b->acdirmin) 2182 goto Ebusy; 2183 if (a->acdirmax != b->acdirmax) 2184 goto Ebusy; 2185 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2186 goto Ebusy; 2187 return 1; 2188 Ebusy: 2189 return 0; 2190 } 2191 2192 struct nfs_sb_mountdata { 2193 struct nfs_server *server; 2194 int mntflags; 2195 }; 2196 2197 static int nfs_set_super(struct super_block *s, void *data) 2198 { 2199 struct nfs_sb_mountdata *sb_mntdata = data; 2200 struct nfs_server *server = sb_mntdata->server; 2201 int ret; 2202 2203 s->s_flags = sb_mntdata->mntflags; 2204 s->s_fs_info = server; 2205 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2206 ret = set_anon_super(s, server); 2207 if (ret == 0) 2208 server->s_dev = s->s_dev; 2209 return ret; 2210 } 2211 2212 static int nfs_compare_super_address(struct nfs_server *server1, 2213 struct nfs_server *server2) 2214 { 2215 struct sockaddr *sap1, *sap2; 2216 2217 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2218 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2219 2220 if (sap1->sa_family != sap2->sa_family) 2221 return 0; 2222 2223 switch (sap1->sa_family) { 2224 case AF_INET: { 2225 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2226 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2227 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2228 return 0; 2229 if (sin1->sin_port != sin2->sin_port) 2230 return 0; 2231 break; 2232 } 2233 case AF_INET6: { 2234 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2235 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2236 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2237 return 0; 2238 if (sin1->sin6_port != sin2->sin6_port) 2239 return 0; 2240 break; 2241 } 2242 default: 2243 return 0; 2244 } 2245 2246 return 1; 2247 } 2248 2249 static int nfs_compare_super(struct super_block *sb, void *data) 2250 { 2251 struct nfs_sb_mountdata *sb_mntdata = data; 2252 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2253 int mntflags = sb_mntdata->mntflags; 2254 2255 if (!nfs_compare_super_address(old, server)) 2256 return 0; 2257 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2258 if (old->flags & NFS_MOUNT_UNSHARED) 2259 return 0; 2260 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2261 return 0; 2262 return nfs_compare_mount_options(sb, server, mntflags); 2263 } 2264 2265 static int nfs_bdi_register(struct nfs_server *server) 2266 { 2267 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2268 } 2269 2270 static int nfs_get_sb(struct file_system_type *fs_type, 2271 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2272 { 2273 struct nfs_server *server = NULL; 2274 struct super_block *s; 2275 struct nfs_parsed_mount_data *data; 2276 struct nfs_fh *mntfh; 2277 struct dentry *mntroot; 2278 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2279 struct nfs_sb_mountdata sb_mntdata = { 2280 .mntflags = flags, 2281 }; 2282 int error = -ENOMEM; 2283 2284 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); 2285 mntfh = nfs_alloc_fhandle(); 2286 if (data == NULL || mntfh == NULL) 2287 goto out_free_fh; 2288 2289 security_init_mnt_opts(&data->lsm_opts); 2290 2291 /* Validate the mount data */ 2292 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2293 if (error < 0) 2294 goto out; 2295 2296 #ifdef CONFIG_NFS_V4 2297 if (data->version == 4) { 2298 error = nfs4_try_mount(flags, dev_name, data, mnt); 2299 kfree(data->client_address); 2300 kfree(data->nfs_server.export_path); 2301 goto out; 2302 } 2303 #endif /* CONFIG_NFS_V4 */ 2304 2305 /* Get a volume representation */ 2306 server = nfs_create_server(data, mntfh); 2307 if (IS_ERR(server)) { 2308 error = PTR_ERR(server); 2309 goto out; 2310 } 2311 sb_mntdata.server = server; 2312 2313 if (server->flags & NFS_MOUNT_UNSHARED) 2314 compare_super = NULL; 2315 2316 /* Get a superblock - note that we may end up sharing one that already exists */ 2317 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2318 if (IS_ERR(s)) { 2319 error = PTR_ERR(s); 2320 goto out_err_nosb; 2321 } 2322 2323 if (s->s_fs_info != server) { 2324 nfs_free_server(server); 2325 server = NULL; 2326 } else { 2327 error = nfs_bdi_register(server); 2328 if (error) 2329 goto error_splat_bdi; 2330 } 2331 2332 if (!s->s_root) { 2333 /* initial superblock/root creation */ 2334 nfs_fill_super(s, data); 2335 nfs_fscache_get_super_cookie( 2336 s, data ? data->fscache_uniq : NULL, NULL); 2337 } 2338 2339 mntroot = nfs_get_root(s, mntfh); 2340 if (IS_ERR(mntroot)) { 2341 error = PTR_ERR(mntroot); 2342 goto error_splat_super; 2343 } 2344 2345 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2346 if (error) 2347 goto error_splat_root; 2348 2349 s->s_flags |= MS_ACTIVE; 2350 mnt->mnt_sb = s; 2351 mnt->mnt_root = mntroot; 2352 error = 0; 2353 2354 out: 2355 kfree(data->nfs_server.hostname); 2356 kfree(data->mount_server.hostname); 2357 kfree(data->fscache_uniq); 2358 security_free_mnt_opts(&data->lsm_opts); 2359 out_free_fh: 2360 nfs_free_fhandle(mntfh); 2361 kfree(data); 2362 return error; 2363 2364 out_err_nosb: 2365 nfs_free_server(server); 2366 goto out; 2367 2368 error_splat_root: 2369 dput(mntroot); 2370 error_splat_super: 2371 if (server && !s->s_root) 2372 bdi_unregister(&server->backing_dev_info); 2373 error_splat_bdi: 2374 deactivate_locked_super(s); 2375 goto out; 2376 } 2377 2378 /* 2379 * Ensure that we unregister the bdi before kill_anon_super 2380 * releases the device name 2381 */ 2382 static void nfs_put_super(struct super_block *s) 2383 { 2384 struct nfs_server *server = NFS_SB(s); 2385 2386 bdi_unregister(&server->backing_dev_info); 2387 } 2388 2389 /* 2390 * Destroy an NFS2/3 superblock 2391 */ 2392 static void nfs_kill_super(struct super_block *s) 2393 { 2394 struct nfs_server *server = NFS_SB(s); 2395 2396 kill_anon_super(s); 2397 nfs_fscache_release_super_cookie(s); 2398 nfs_free_server(server); 2399 } 2400 2401 /* 2402 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2403 */ 2404 static struct dentry * 2405 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2406 const char *dev_name, void *raw_data) 2407 { 2408 struct nfs_clone_mount *data = raw_data; 2409 struct super_block *s; 2410 struct nfs_server *server; 2411 struct dentry *mntroot; 2412 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2413 struct nfs_sb_mountdata sb_mntdata = { 2414 .mntflags = flags, 2415 }; 2416 int error; 2417 2418 dprintk("--> nfs_xdev_mount()\n"); 2419 2420 /* create a new volume representation */ 2421 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2422 if (IS_ERR(server)) { 2423 error = PTR_ERR(server); 2424 goto out_err_noserver; 2425 } 2426 sb_mntdata.server = server; 2427 2428 if (server->flags & NFS_MOUNT_UNSHARED) 2429 compare_super = NULL; 2430 2431 /* Get a superblock - note that we may end up sharing one that already exists */ 2432 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2433 if (IS_ERR(s)) { 2434 error = PTR_ERR(s); 2435 goto out_err_nosb; 2436 } 2437 2438 if (s->s_fs_info != server) { 2439 nfs_free_server(server); 2440 server = NULL; 2441 } else { 2442 error = nfs_bdi_register(server); 2443 if (error) 2444 goto error_splat_bdi; 2445 } 2446 2447 if (!s->s_root) { 2448 /* initial superblock/root creation */ 2449 nfs_clone_super(s, data->sb); 2450 nfs_fscache_get_super_cookie(s, NULL, data); 2451 } 2452 2453 mntroot = nfs_get_root(s, data->fh); 2454 if (IS_ERR(mntroot)) { 2455 error = PTR_ERR(mntroot); 2456 goto error_splat_super; 2457 } 2458 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2459 dput(mntroot); 2460 error = -ESTALE; 2461 goto error_splat_super; 2462 } 2463 2464 s->s_flags |= MS_ACTIVE; 2465 2466 /* clone any lsm security options from the parent to the new sb */ 2467 security_sb_clone_mnt_opts(data->sb, s); 2468 2469 dprintk("<-- nfs_xdev_mount() = 0\n"); 2470 return mntroot; 2471 2472 out_err_nosb: 2473 nfs_free_server(server); 2474 out_err_noserver: 2475 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2476 return ERR_PTR(error); 2477 2478 error_splat_super: 2479 if (server && !s->s_root) 2480 bdi_unregister(&server->backing_dev_info); 2481 error_splat_bdi: 2482 deactivate_locked_super(s); 2483 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2484 return ERR_PTR(error); 2485 } 2486 2487 #ifdef CONFIG_NFS_V4 2488 2489 /* 2490 * Finish setting up a cloned NFS4 superblock 2491 */ 2492 static void nfs4_clone_super(struct super_block *sb, 2493 const struct super_block *old_sb) 2494 { 2495 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2496 sb->s_blocksize = old_sb->s_blocksize; 2497 sb->s_maxbytes = old_sb->s_maxbytes; 2498 sb->s_time_gran = 1; 2499 sb->s_op = old_sb->s_op; 2500 /* 2501 * The VFS shouldn't apply the umask to mode bits. We will do 2502 * so ourselves when necessary. 2503 */ 2504 sb->s_flags |= MS_POSIXACL; 2505 sb->s_xattr = old_sb->s_xattr; 2506 nfs_initialise_sb(sb); 2507 } 2508 2509 /* 2510 * Set up an NFS4 superblock 2511 */ 2512 static void nfs4_fill_super(struct super_block *sb) 2513 { 2514 sb->s_time_gran = 1; 2515 sb->s_op = &nfs4_sops; 2516 /* 2517 * The VFS shouldn't apply the umask to mode bits. We will do 2518 * so ourselves when necessary. 2519 */ 2520 sb->s_flags |= MS_POSIXACL; 2521 sb->s_xattr = nfs4_xattr_handlers; 2522 nfs_initialise_sb(sb); 2523 } 2524 2525 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2526 { 2527 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2528 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2529 } 2530 2531 static int nfs4_validate_text_mount_data(void *options, 2532 struct nfs_parsed_mount_data *args, 2533 const char *dev_name) 2534 { 2535 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2536 2537 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2538 2539 nfs_validate_transport_protocol(args); 2540 2541 nfs4_validate_mount_flags(args); 2542 2543 if (args->version != 4) { 2544 dfprintk(MOUNT, 2545 "NFS4: Illegal mount version\n"); 2546 return -EINVAL; 2547 } 2548 2549 if (args->auth_flavor_len > 1) { 2550 dfprintk(MOUNT, 2551 "NFS4: Too many RPC auth flavours specified\n"); 2552 return -EINVAL; 2553 } 2554 2555 if (args->client_address == NULL) { 2556 dfprintk(MOUNT, 2557 "NFS4: mount program didn't pass callback address\n"); 2558 return -EINVAL; 2559 } 2560 2561 return nfs_parse_devname(dev_name, 2562 &args->nfs_server.hostname, 2563 NFS4_MAXNAMLEN, 2564 &args->nfs_server.export_path, 2565 NFS4_MAXPATHLEN); 2566 } 2567 2568 /* 2569 * Validate NFSv4 mount options 2570 */ 2571 static int nfs4_validate_mount_data(void *options, 2572 struct nfs_parsed_mount_data *args, 2573 const char *dev_name) 2574 { 2575 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2576 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2577 char *c; 2578 2579 if (data == NULL) 2580 goto out_no_data; 2581 2582 switch (data->version) { 2583 case 1: 2584 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2585 goto out_no_address; 2586 if (data->host_addrlen == 0) 2587 goto out_no_address; 2588 args->nfs_server.addrlen = data->host_addrlen; 2589 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2590 return -EFAULT; 2591 if (!nfs_verify_server_address(sap)) 2592 goto out_no_address; 2593 2594 if (data->auth_flavourlen) { 2595 if (data->auth_flavourlen > 1) 2596 goto out_inval_auth; 2597 if (copy_from_user(&args->auth_flavors[0], 2598 data->auth_flavours, 2599 sizeof(args->auth_flavors[0]))) 2600 return -EFAULT; 2601 } 2602 2603 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2604 if (IS_ERR(c)) 2605 return PTR_ERR(c); 2606 args->nfs_server.hostname = c; 2607 2608 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2609 if (IS_ERR(c)) 2610 return PTR_ERR(c); 2611 args->nfs_server.export_path = c; 2612 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2613 2614 c = strndup_user(data->client_addr.data, 16); 2615 if (IS_ERR(c)) 2616 return PTR_ERR(c); 2617 args->client_address = c; 2618 2619 /* 2620 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2621 * can deal with. 2622 */ 2623 2624 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2625 args->rsize = data->rsize; 2626 args->wsize = data->wsize; 2627 args->timeo = data->timeo; 2628 args->retrans = data->retrans; 2629 args->acregmin = data->acregmin; 2630 args->acregmax = data->acregmax; 2631 args->acdirmin = data->acdirmin; 2632 args->acdirmax = data->acdirmax; 2633 args->nfs_server.protocol = data->proto; 2634 nfs_validate_transport_protocol(args); 2635 2636 break; 2637 default: 2638 if (nfs_parse_mount_options((char *)options, args) == 0) 2639 return -EINVAL; 2640 2641 if (!nfs_verify_server_address(sap)) 2642 return -EINVAL; 2643 2644 return nfs4_validate_text_mount_data(options, args, dev_name); 2645 } 2646 2647 return 0; 2648 2649 out_no_data: 2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2651 return -EINVAL; 2652 2653 out_inval_auth: 2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2655 data->auth_flavourlen); 2656 return -EINVAL; 2657 2658 out_no_address: 2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2660 return -EINVAL; 2661 } 2662 2663 /* 2664 * Get the superblock for the NFS4 root partition 2665 */ 2666 static struct dentry * 2667 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2668 const char *dev_name, void *raw_data) 2669 { 2670 struct nfs_parsed_mount_data *data = raw_data; 2671 struct super_block *s; 2672 struct nfs_server *server; 2673 struct nfs_fh *mntfh; 2674 struct dentry *mntroot; 2675 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2676 struct nfs_sb_mountdata sb_mntdata = { 2677 .mntflags = flags, 2678 }; 2679 int error = -ENOMEM; 2680 2681 mntfh = nfs_alloc_fhandle(); 2682 if (data == NULL || mntfh == NULL) 2683 goto out_free_fh; 2684 2685 security_init_mnt_opts(&data->lsm_opts); 2686 2687 /* Get a volume representation */ 2688 server = nfs4_create_server(data, mntfh); 2689 if (IS_ERR(server)) { 2690 error = PTR_ERR(server); 2691 goto out; 2692 } 2693 sb_mntdata.server = server; 2694 2695 if (server->flags & NFS4_MOUNT_UNSHARED) 2696 compare_super = NULL; 2697 2698 /* Get a superblock - note that we may end up sharing one that already exists */ 2699 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2700 if (IS_ERR(s)) { 2701 error = PTR_ERR(s); 2702 goto out_free; 2703 } 2704 2705 if (s->s_fs_info != server) { 2706 nfs_free_server(server); 2707 server = NULL; 2708 } else { 2709 error = nfs_bdi_register(server); 2710 if (error) 2711 goto error_splat_bdi; 2712 } 2713 2714 if (!s->s_root) { 2715 /* initial superblock/root creation */ 2716 nfs4_fill_super(s); 2717 nfs_fscache_get_super_cookie( 2718 s, data ? data->fscache_uniq : NULL, NULL); 2719 } 2720 2721 mntroot = nfs4_get_root(s, mntfh); 2722 if (IS_ERR(mntroot)) { 2723 error = PTR_ERR(mntroot); 2724 goto error_splat_super; 2725 } 2726 2727 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2728 if (error) 2729 goto error_splat_root; 2730 2731 s->s_flags |= MS_ACTIVE; 2732 2733 security_free_mnt_opts(&data->lsm_opts); 2734 nfs_free_fhandle(mntfh); 2735 return mntroot; 2736 2737 out: 2738 security_free_mnt_opts(&data->lsm_opts); 2739 out_free_fh: 2740 nfs_free_fhandle(mntfh); 2741 return ERR_PTR(error); 2742 2743 out_free: 2744 nfs_free_server(server); 2745 goto out; 2746 2747 error_splat_root: 2748 dput(mntroot); 2749 error_splat_super: 2750 if (server && !s->s_root) 2751 bdi_unregister(&server->backing_dev_info); 2752 error_splat_bdi: 2753 deactivate_locked_super(s); 2754 goto out; 2755 } 2756 2757 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2758 int flags, void *data, const char *hostname) 2759 { 2760 struct vfsmount *root_mnt; 2761 char *root_devname; 2762 size_t len; 2763 2764 len = strlen(hostname) + 3; 2765 root_devname = kmalloc(len, GFP_KERNEL); 2766 if (root_devname == NULL) 2767 return ERR_PTR(-ENOMEM); 2768 snprintf(root_devname, len, "%s:/", hostname); 2769 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2770 kfree(root_devname); 2771 return root_mnt; 2772 } 2773 2774 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2775 { 2776 char *page = (char *) __get_free_page(GFP_KERNEL); 2777 char *devname, *tmp; 2778 2779 if (page == NULL) 2780 return; 2781 devname = nfs_path(path->mnt->mnt_devname, 2782 path->mnt->mnt_root, path->dentry, 2783 page, PAGE_SIZE); 2784 if (IS_ERR(devname)) 2785 goto out_freepage; 2786 tmp = kstrdup(devname, GFP_KERNEL); 2787 if (tmp == NULL) 2788 goto out_freepage; 2789 kfree(mnt->mnt_devname); 2790 mnt->mnt_devname = tmp; 2791 out_freepage: 2792 free_page((unsigned long)page); 2793 } 2794 2795 struct nfs_referral_count { 2796 struct list_head list; 2797 const struct task_struct *task; 2798 unsigned int referral_count; 2799 }; 2800 2801 static LIST_HEAD(nfs_referral_count_list); 2802 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2803 2804 static struct nfs_referral_count *nfs_find_referral_count(void) 2805 { 2806 struct nfs_referral_count *p; 2807 2808 list_for_each_entry(p, &nfs_referral_count_list, list) { 2809 if (p->task == current) 2810 return p; 2811 } 2812 return NULL; 2813 } 2814 2815 #define NFS_MAX_NESTED_REFERRALS 2 2816 2817 static int nfs_referral_loop_protect(void) 2818 { 2819 struct nfs_referral_count *p, *new; 2820 int ret = -ENOMEM; 2821 2822 new = kmalloc(sizeof(*new), GFP_KERNEL); 2823 if (!new) 2824 goto out; 2825 new->task = current; 2826 new->referral_count = 1; 2827 2828 ret = 0; 2829 spin_lock(&nfs_referral_count_list_lock); 2830 p = nfs_find_referral_count(); 2831 if (p != NULL) { 2832 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2833 ret = -ELOOP; 2834 else 2835 p->referral_count++; 2836 } else { 2837 list_add(&new->list, &nfs_referral_count_list); 2838 new = NULL; 2839 } 2840 spin_unlock(&nfs_referral_count_list_lock); 2841 kfree(new); 2842 out: 2843 return ret; 2844 } 2845 2846 static void nfs_referral_loop_unprotect(void) 2847 { 2848 struct nfs_referral_count *p; 2849 2850 spin_lock(&nfs_referral_count_list_lock); 2851 p = nfs_find_referral_count(); 2852 p->referral_count--; 2853 if (p->referral_count == 0) 2854 list_del(&p->list); 2855 else 2856 p = NULL; 2857 spin_unlock(&nfs_referral_count_list_lock); 2858 kfree(p); 2859 } 2860 2861 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2862 const char *export_path, struct vfsmount *mnt_target) 2863 { 2864 struct nameidata *nd = NULL; 2865 struct mnt_namespace *ns_private; 2866 struct super_block *s; 2867 int ret; 2868 2869 nd = kmalloc(sizeof(*nd), GFP_KERNEL); 2870 if (nd == NULL) 2871 return -ENOMEM; 2872 2873 ns_private = create_mnt_ns(root_mnt); 2874 ret = PTR_ERR(ns_private); 2875 if (IS_ERR(ns_private)) 2876 goto out_mntput; 2877 2878 ret = nfs_referral_loop_protect(); 2879 if (ret != 0) 2880 goto out_put_mnt_ns; 2881 2882 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2883 export_path, LOOKUP_FOLLOW, nd); 2884 2885 nfs_referral_loop_unprotect(); 2886 put_mnt_ns(ns_private); 2887 2888 if (ret != 0) 2889 goto out_err; 2890 2891 s = nd->path.mnt->mnt_sb; 2892 atomic_inc(&s->s_active); 2893 mnt_target->mnt_sb = s; 2894 mnt_target->mnt_root = dget(nd->path.dentry); 2895 2896 /* Correct the device pathname */ 2897 nfs_fix_devname(&nd->path, mnt_target); 2898 2899 path_put(&nd->path); 2900 kfree(nd); 2901 down_write(&s->s_umount); 2902 return 0; 2903 out_put_mnt_ns: 2904 put_mnt_ns(ns_private); 2905 out_mntput: 2906 mntput(root_mnt); 2907 out_err: 2908 kfree(nd); 2909 return ret; 2910 } 2911 2912 static int nfs4_try_mount(int flags, const char *dev_name, 2913 struct nfs_parsed_mount_data *data, 2914 struct vfsmount *mnt) 2915 { 2916 char *export_path; 2917 struct vfsmount *root_mnt; 2918 int error; 2919 2920 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2921 2922 export_path = data->nfs_server.export_path; 2923 data->nfs_server.export_path = "/"; 2924 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2925 data->nfs_server.hostname); 2926 data->nfs_server.export_path = export_path; 2927 2928 error = PTR_ERR(root_mnt); 2929 if (IS_ERR(root_mnt)) 2930 goto out; 2931 2932 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2933 2934 out: 2935 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2936 error != 0 ? " [error]" : ""); 2937 return error; 2938 } 2939 2940 /* 2941 * Get the superblock for an NFS4 mountpoint 2942 */ 2943 static int nfs4_get_sb(struct file_system_type *fs_type, 2944 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2945 { 2946 struct nfs_parsed_mount_data *data; 2947 int error = -ENOMEM; 2948 2949 data = nfs_alloc_parsed_mount_data(4); 2950 if (data == NULL) 2951 goto out_free_data; 2952 2953 /* Validate the mount data */ 2954 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2955 if (error < 0) 2956 goto out; 2957 2958 error = nfs4_try_mount(flags, dev_name, data, mnt); 2959 2960 out: 2961 kfree(data->client_address); 2962 kfree(data->nfs_server.export_path); 2963 kfree(data->nfs_server.hostname); 2964 kfree(data->fscache_uniq); 2965 out_free_data: 2966 kfree(data); 2967 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2968 error != 0 ? " [error]" : ""); 2969 return error; 2970 } 2971 2972 static void nfs4_kill_super(struct super_block *sb) 2973 { 2974 struct nfs_server *server = NFS_SB(sb); 2975 2976 dprintk("--> %s\n", __func__); 2977 nfs_super_return_all_delegations(sb); 2978 kill_anon_super(sb); 2979 nfs_fscache_release_super_cookie(sb); 2980 nfs_free_server(server); 2981 dprintk("<-- %s\n", __func__); 2982 } 2983 2984 /* 2985 * Clone an NFS4 server record on xdev traversal (FSID-change) 2986 */ 2987 static struct dentry * 2988 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2989 const char *dev_name, void *raw_data) 2990 { 2991 struct nfs_clone_mount *data = raw_data; 2992 struct super_block *s; 2993 struct nfs_server *server; 2994 struct dentry *mntroot; 2995 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2996 struct nfs_sb_mountdata sb_mntdata = { 2997 .mntflags = flags, 2998 }; 2999 int error; 3000 3001 dprintk("--> nfs4_xdev_mount()\n"); 3002 3003 /* create a new volume representation */ 3004 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 3005 if (IS_ERR(server)) { 3006 error = PTR_ERR(server); 3007 goto out_err_noserver; 3008 } 3009 sb_mntdata.server = server; 3010 3011 if (server->flags & NFS4_MOUNT_UNSHARED) 3012 compare_super = NULL; 3013 3014 /* Get a superblock - note that we may end up sharing one that already exists */ 3015 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3016 if (IS_ERR(s)) { 3017 error = PTR_ERR(s); 3018 goto out_err_nosb; 3019 } 3020 3021 if (s->s_fs_info != server) { 3022 nfs_free_server(server); 3023 server = NULL; 3024 } else { 3025 error = nfs_bdi_register(server); 3026 if (error) 3027 goto error_splat_bdi; 3028 } 3029 3030 if (!s->s_root) { 3031 /* initial superblock/root creation */ 3032 nfs4_clone_super(s, data->sb); 3033 nfs_fscache_get_super_cookie(s, NULL, data); 3034 } 3035 3036 mntroot = nfs4_get_root(s, data->fh); 3037 if (IS_ERR(mntroot)) { 3038 error = PTR_ERR(mntroot); 3039 goto error_splat_super; 3040 } 3041 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3042 dput(mntroot); 3043 error = -ESTALE; 3044 goto error_splat_super; 3045 } 3046 3047 s->s_flags |= MS_ACTIVE; 3048 3049 security_sb_clone_mnt_opts(data->sb, s); 3050 3051 dprintk("<-- nfs4_xdev_mount() = 0\n"); 3052 return mntroot; 3053 3054 out_err_nosb: 3055 nfs_free_server(server); 3056 out_err_noserver: 3057 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 3058 return ERR_PTR(error); 3059 3060 error_splat_super: 3061 if (server && !s->s_root) 3062 bdi_unregister(&server->backing_dev_info); 3063 error_splat_bdi: 3064 deactivate_locked_super(s); 3065 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 3066 return ERR_PTR(error); 3067 } 3068 3069 static struct dentry * 3070 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 3071 const char *dev_name, void *raw_data) 3072 { 3073 struct nfs_clone_mount *data = raw_data; 3074 struct super_block *s; 3075 struct nfs_server *server; 3076 struct dentry *mntroot; 3077 struct nfs_fh *mntfh; 3078 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 3079 struct nfs_sb_mountdata sb_mntdata = { 3080 .mntflags = flags, 3081 }; 3082 int error = -ENOMEM; 3083 3084 dprintk("--> nfs4_referral_get_sb()\n"); 3085 3086 mntfh = nfs_alloc_fhandle(); 3087 if (mntfh == NULL) 3088 goto out_err_nofh; 3089 3090 /* create a new volume representation */ 3091 server = nfs4_create_referral_server(data, mntfh); 3092 if (IS_ERR(server)) { 3093 error = PTR_ERR(server); 3094 goto out_err_noserver; 3095 } 3096 sb_mntdata.server = server; 3097 3098 if (server->flags & NFS4_MOUNT_UNSHARED) 3099 compare_super = NULL; 3100 3101 /* Get a superblock - note that we may end up sharing one that already exists */ 3102 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 3103 if (IS_ERR(s)) { 3104 error = PTR_ERR(s); 3105 goto out_err_nosb; 3106 } 3107 3108 if (s->s_fs_info != server) { 3109 nfs_free_server(server); 3110 server = NULL; 3111 } else { 3112 error = nfs_bdi_register(server); 3113 if (error) 3114 goto error_splat_bdi; 3115 } 3116 3117 if (!s->s_root) { 3118 /* initial superblock/root creation */ 3119 nfs4_fill_super(s); 3120 nfs_fscache_get_super_cookie(s, NULL, data); 3121 } 3122 3123 mntroot = nfs4_get_root(s, mntfh); 3124 if (IS_ERR(mntroot)) { 3125 error = PTR_ERR(mntroot); 3126 goto error_splat_super; 3127 } 3128 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3129 dput(mntroot); 3130 error = -ESTALE; 3131 goto error_splat_super; 3132 } 3133 3134 s->s_flags |= MS_ACTIVE; 3135 3136 security_sb_clone_mnt_opts(data->sb, s); 3137 3138 nfs_free_fhandle(mntfh); 3139 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3140 return mntroot; 3141 3142 out_err_nosb: 3143 nfs_free_server(server); 3144 out_err_noserver: 3145 nfs_free_fhandle(mntfh); 3146 out_err_nofh: 3147 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3148 return ERR_PTR(error); 3149 3150 error_splat_super: 3151 if (server && !s->s_root) 3152 bdi_unregister(&server->backing_dev_info); 3153 error_splat_bdi: 3154 deactivate_locked_super(s); 3155 nfs_free_fhandle(mntfh); 3156 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3157 return ERR_PTR(error); 3158 } 3159 3160 /* 3161 * Create an NFS4 server record on referral traversal 3162 */ 3163 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 3164 int flags, const char *dev_name, void *raw_data, 3165 struct vfsmount *mnt) 3166 { 3167 struct nfs_clone_mount *data = raw_data; 3168 char *export_path; 3169 struct vfsmount *root_mnt; 3170 int error; 3171 3172 dprintk("--> nfs4_referral_get_sb()\n"); 3173 3174 export_path = data->mnt_path; 3175 data->mnt_path = "/"; 3176 3177 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3178 flags, data, data->hostname); 3179 data->mnt_path = export_path; 3180 3181 error = PTR_ERR(root_mnt); 3182 if (IS_ERR(root_mnt)) 3183 goto out; 3184 3185 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 3186 out: 3187 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 3188 error != 0 ? " [error]" : ""); 3189 return error; 3190 } 3191 3192 #endif /* CONFIG_NFS_V4 */ 3193