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