1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/smp_lock.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/mnt_namespace.h> 46 #include <linux/namei.h> 47 #include <linux/nfs_idmap.h> 48 #include <linux/vfs.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <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 enum { 70 /* Mount options that take no arguments */ 71 Opt_soft, Opt_hard, 72 Opt_posix, Opt_noposix, 73 Opt_cto, Opt_nocto, 74 Opt_ac, Opt_noac, 75 Opt_lock, Opt_nolock, 76 Opt_v2, Opt_v3, 77 Opt_udp, Opt_tcp, Opt_rdma, 78 Opt_acl, Opt_noacl, 79 Opt_rdirplus, Opt_nordirplus, 80 Opt_sharecache, Opt_nosharecache, 81 Opt_resvport, Opt_noresvport, 82 Opt_fscache, Opt_nofscache, 83 84 /* Mount options that take integer arguments */ 85 Opt_port, 86 Opt_rsize, Opt_wsize, Opt_bsize, 87 Opt_timeo, Opt_retrans, 88 Opt_acregmin, Opt_acregmax, 89 Opt_acdirmin, Opt_acdirmax, 90 Opt_actimeo, 91 Opt_namelen, 92 Opt_mountport, 93 Opt_mountvers, 94 Opt_nfsvers, 95 Opt_minorversion, 96 97 /* Mount options that take string arguments */ 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 99 Opt_addr, Opt_mountaddr, Opt_clientaddr, 100 Opt_lookupcache, 101 Opt_fscache_uniq, 102 103 /* Special mount options */ 104 Opt_userspace, Opt_deprecated, Opt_sloppy, 105 106 Opt_err 107 }; 108 109 static const match_table_t nfs_mount_option_tokens = { 110 { Opt_userspace, "bg" }, 111 { Opt_userspace, "fg" }, 112 { Opt_userspace, "retry=%s" }, 113 114 { Opt_sloppy, "sloppy" }, 115 116 { Opt_soft, "soft" }, 117 { Opt_hard, "hard" }, 118 { Opt_deprecated, "intr" }, 119 { Opt_deprecated, "nointr" }, 120 { Opt_posix, "posix" }, 121 { Opt_noposix, "noposix" }, 122 { Opt_cto, "cto" }, 123 { Opt_nocto, "nocto" }, 124 { Opt_ac, "ac" }, 125 { Opt_noac, "noac" }, 126 { Opt_lock, "lock" }, 127 { Opt_nolock, "nolock" }, 128 { Opt_v2, "v2" }, 129 { Opt_v3, "v3" }, 130 { Opt_udp, "udp" }, 131 { Opt_tcp, "tcp" }, 132 { Opt_rdma, "rdma" }, 133 { Opt_acl, "acl" }, 134 { Opt_noacl, "noacl" }, 135 { Opt_rdirplus, "rdirplus" }, 136 { Opt_nordirplus, "nordirplus" }, 137 { Opt_sharecache, "sharecache" }, 138 { Opt_nosharecache, "nosharecache" }, 139 { Opt_resvport, "resvport" }, 140 { Opt_noresvport, "noresvport" }, 141 { Opt_fscache, "fsc" }, 142 { Opt_fscache_uniq, "fsc=%s" }, 143 { Opt_nofscache, "nofsc" }, 144 145 { Opt_port, "port=%s" }, 146 { Opt_rsize, "rsize=%s" }, 147 { Opt_wsize, "wsize=%s" }, 148 { Opt_bsize, "bsize=%s" }, 149 { Opt_timeo, "timeo=%s" }, 150 { Opt_retrans, "retrans=%s" }, 151 { Opt_acregmin, "acregmin=%s" }, 152 { Opt_acregmax, "acregmax=%s" }, 153 { Opt_acdirmin, "acdirmin=%s" }, 154 { Opt_acdirmax, "acdirmax=%s" }, 155 { Opt_actimeo, "actimeo=%s" }, 156 { Opt_namelen, "namlen=%s" }, 157 { Opt_mountport, "mountport=%s" }, 158 { Opt_mountvers, "mountvers=%s" }, 159 { Opt_nfsvers, "nfsvers=%s" }, 160 { Opt_nfsvers, "vers=%s" }, 161 { Opt_minorversion, "minorversion=%u" }, 162 163 { Opt_sec, "sec=%s" }, 164 { Opt_proto, "proto=%s" }, 165 { Opt_mountproto, "mountproto=%s" }, 166 { Opt_addr, "addr=%s" }, 167 { Opt_clientaddr, "clientaddr=%s" }, 168 { Opt_mounthost, "mounthost=%s" }, 169 { Opt_mountaddr, "mountaddr=%s" }, 170 171 { Opt_lookupcache, "lookupcache=%s" }, 172 173 { Opt_err, NULL } 174 }; 175 176 enum { 177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, 178 179 Opt_xprt_err 180 }; 181 182 static const match_table_t nfs_xprt_protocol_tokens = { 183 { Opt_xprt_udp, "udp" }, 184 { Opt_xprt_tcp, "tcp" }, 185 { Opt_xprt_rdma, "rdma" }, 186 187 { Opt_xprt_err, NULL } 188 }; 189 190 enum { 191 Opt_sec_none, Opt_sec_sys, 192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 195 196 Opt_sec_err 197 }; 198 199 static const match_table_t nfs_secflavor_tokens = { 200 { Opt_sec_none, "none" }, 201 { Opt_sec_none, "null" }, 202 { Opt_sec_sys, "sys" }, 203 204 { Opt_sec_krb5, "krb5" }, 205 { Opt_sec_krb5i, "krb5i" }, 206 { Opt_sec_krb5p, "krb5p" }, 207 208 { Opt_sec_lkey, "lkey" }, 209 { Opt_sec_lkeyi, "lkeyi" }, 210 { Opt_sec_lkeyp, "lkeyp" }, 211 212 { Opt_sec_spkm, "spkm3" }, 213 { Opt_sec_spkmi, "spkm3i" }, 214 { Opt_sec_spkmp, "spkm3p" }, 215 216 { Opt_sec_err, NULL } 217 }; 218 219 enum { 220 Opt_lookupcache_all, Opt_lookupcache_positive, 221 Opt_lookupcache_none, 222 223 Opt_lookupcache_err 224 }; 225 226 static match_table_t nfs_lookupcache_tokens = { 227 { Opt_lookupcache_all, "all" }, 228 { Opt_lookupcache_positive, "pos" }, 229 { Opt_lookupcache_positive, "positive" }, 230 { Opt_lookupcache_none, "none" }, 231 232 { Opt_lookupcache_err, NULL } 233 }; 234 235 236 static void nfs_umount_begin(struct super_block *); 237 static int nfs_statfs(struct dentry *, struct kstatfs *); 238 static int nfs_show_options(struct seq_file *, struct vfsmount *); 239 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 240 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 241 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 243 static void nfs_kill_super(struct super_block *); 244 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 245 246 static struct file_system_type nfs_fs_type = { 247 .owner = THIS_MODULE, 248 .name = "nfs", 249 .get_sb = nfs_get_sb, 250 .kill_sb = nfs_kill_super, 251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 252 }; 253 254 struct file_system_type nfs_xdev_fs_type = { 255 .owner = THIS_MODULE, 256 .name = "nfs", 257 .get_sb = nfs_xdev_get_sb, 258 .kill_sb = nfs_kill_super, 259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 260 }; 261 262 static const struct super_operations nfs_sops = { 263 .alloc_inode = nfs_alloc_inode, 264 .destroy_inode = nfs_destroy_inode, 265 .write_inode = nfs_write_inode, 266 .statfs = nfs_statfs, 267 .clear_inode = nfs_clear_inode, 268 .umount_begin = nfs_umount_begin, 269 .show_options = nfs_show_options, 270 .show_stats = nfs_show_stats, 271 .remount_fs = nfs_remount, 272 }; 273 274 #ifdef CONFIG_NFS_V4 275 static int nfs4_get_sb(struct file_system_type *fs_type, 276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 277 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 279 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 281 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 283 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 285 static void nfs4_kill_super(struct super_block *sb); 286 287 static struct file_system_type nfs4_fs_type = { 288 .owner = THIS_MODULE, 289 .name = "nfs4", 290 .get_sb = nfs4_get_sb, 291 .kill_sb = nfs4_kill_super, 292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 293 }; 294 295 static struct file_system_type nfs4_remote_fs_type = { 296 .owner = THIS_MODULE, 297 .name = "nfs4", 298 .get_sb = nfs4_remote_get_sb, 299 .kill_sb = nfs4_kill_super, 300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 301 }; 302 303 struct file_system_type nfs4_xdev_fs_type = { 304 .owner = THIS_MODULE, 305 .name = "nfs4", 306 .get_sb = nfs4_xdev_get_sb, 307 .kill_sb = nfs4_kill_super, 308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 309 }; 310 311 static struct file_system_type nfs4_remote_referral_fs_type = { 312 .owner = THIS_MODULE, 313 .name = "nfs4", 314 .get_sb = nfs4_remote_referral_get_sb, 315 .kill_sb = nfs4_kill_super, 316 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 317 }; 318 319 struct file_system_type nfs4_referral_fs_type = { 320 .owner = THIS_MODULE, 321 .name = "nfs4", 322 .get_sb = nfs4_referral_get_sb, 323 .kill_sb = nfs4_kill_super, 324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 325 }; 326 327 static const struct super_operations nfs4_sops = { 328 .alloc_inode = nfs_alloc_inode, 329 .destroy_inode = nfs_destroy_inode, 330 .write_inode = nfs_write_inode, 331 .statfs = nfs_statfs, 332 .clear_inode = nfs4_clear_inode, 333 .umount_begin = nfs_umount_begin, 334 .show_options = nfs_show_options, 335 .show_stats = nfs_show_stats, 336 .remount_fs = nfs_remount, 337 }; 338 #endif 339 340 static struct shrinker acl_shrinker = { 341 .shrink = nfs_access_cache_shrinker, 342 .seeks = DEFAULT_SEEKS, 343 }; 344 345 /* 346 * Register the NFS filesystems 347 */ 348 int __init register_nfs_fs(void) 349 { 350 int ret; 351 352 ret = register_filesystem(&nfs_fs_type); 353 if (ret < 0) 354 goto error_0; 355 356 ret = nfs_register_sysctl(); 357 if (ret < 0) 358 goto error_1; 359 #ifdef CONFIG_NFS_V4 360 ret = register_filesystem(&nfs4_fs_type); 361 if (ret < 0) 362 goto error_2; 363 #endif 364 register_shrinker(&acl_shrinker); 365 return 0; 366 367 #ifdef CONFIG_NFS_V4 368 error_2: 369 nfs_unregister_sysctl(); 370 #endif 371 error_1: 372 unregister_filesystem(&nfs_fs_type); 373 error_0: 374 return ret; 375 } 376 377 /* 378 * Unregister the NFS filesystems 379 */ 380 void __exit unregister_nfs_fs(void) 381 { 382 unregister_shrinker(&acl_shrinker); 383 #ifdef CONFIG_NFS_V4 384 unregister_filesystem(&nfs4_fs_type); 385 #endif 386 nfs_unregister_sysctl(); 387 unregister_filesystem(&nfs_fs_type); 388 } 389 390 void nfs_sb_active(struct super_block *sb) 391 { 392 struct nfs_server *server = NFS_SB(sb); 393 394 if (atomic_inc_return(&server->active) == 1) 395 atomic_inc(&sb->s_active); 396 } 397 398 void nfs_sb_deactive(struct super_block *sb) 399 { 400 struct nfs_server *server = NFS_SB(sb); 401 402 if (atomic_dec_and_test(&server->active)) 403 deactivate_super(sb); 404 } 405 406 /* 407 * Deliver file system statistics to userspace 408 */ 409 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 410 { 411 struct nfs_server *server = NFS_SB(dentry->d_sb); 412 unsigned char blockbits; 413 unsigned long blockres; 414 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 415 struct nfs_fattr fattr; 416 struct nfs_fsstat res = { 417 .fattr = &fattr, 418 }; 419 int error; 420 421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 422 if (error < 0) 423 goto out_err; 424 buf->f_type = NFS_SUPER_MAGIC; 425 426 /* 427 * Current versions of glibc do not correctly handle the 428 * case where f_frsize != f_bsize. Eventually we want to 429 * report the value of wtmult in this field. 430 */ 431 buf->f_frsize = dentry->d_sb->s_blocksize; 432 433 /* 434 * On most *nix systems, f_blocks, f_bfree, and f_bavail 435 * are reported in units of f_frsize. Linux hasn't had 436 * an f_frsize field in its statfs struct until recently, 437 * thus historically Linux's sys_statfs reports these 438 * fields in units of f_bsize. 439 */ 440 buf->f_bsize = dentry->d_sb->s_blocksize; 441 blockbits = dentry->d_sb->s_blocksize_bits; 442 blockres = (1 << blockbits) - 1; 443 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 444 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 445 buf->f_bavail = (res.abytes + blockres) >> blockbits; 446 447 buf->f_files = res.tfiles; 448 buf->f_ffree = res.afiles; 449 450 buf->f_namelen = server->namelen; 451 452 return 0; 453 454 out_err: 455 dprintk("%s: statfs error = %d\n", __func__, -error); 456 return error; 457 } 458 459 /* 460 * Map the security flavour number to a name 461 */ 462 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 463 { 464 static const struct { 465 rpc_authflavor_t flavour; 466 const char *str; 467 } sec_flavours[] = { 468 { RPC_AUTH_NULL, "null" }, 469 { RPC_AUTH_UNIX, "sys" }, 470 { RPC_AUTH_GSS_KRB5, "krb5" }, 471 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 472 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 473 { RPC_AUTH_GSS_LKEY, "lkey" }, 474 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 475 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 476 { RPC_AUTH_GSS_SPKM, "spkm" }, 477 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 478 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 479 { UINT_MAX, "unknown" } 480 }; 481 int i; 482 483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 484 if (sec_flavours[i].flavour == flavour) 485 break; 486 } 487 return sec_flavours[i].str; 488 } 489 490 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 491 int showdefaults) 492 { 493 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 494 495 switch (sap->sa_family) { 496 case AF_INET: { 497 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 499 break; 500 } 501 case AF_INET6: { 502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr); 504 break; 505 } 506 default: 507 if (showdefaults) 508 seq_printf(m, ",mountaddr=unspecified"); 509 } 510 511 if (nfss->mountd_version || showdefaults) 512 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 513 if (nfss->mountd_port || showdefaults) 514 seq_printf(m, ",mountport=%u", nfss->mountd_port); 515 516 switch (nfss->mountd_protocol) { 517 case IPPROTO_UDP: 518 seq_printf(m, ",mountproto=udp"); 519 break; 520 case IPPROTO_TCP: 521 seq_printf(m, ",mountproto=tcp"); 522 break; 523 default: 524 if (showdefaults) 525 seq_printf(m, ",mountproto=auto"); 526 } 527 } 528 529 /* 530 * Describe the mount options in force on this server representation 531 */ 532 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 533 int showdefaults) 534 { 535 static const struct proc_nfs_info { 536 int flag; 537 const char *str; 538 const char *nostr; 539 } nfs_info[] = { 540 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 541 { NFS_MOUNT_POSIX, ",posix", "" }, 542 { NFS_MOUNT_NOCTO, ",nocto", "" }, 543 { NFS_MOUNT_NOAC, ",noac", "" }, 544 { NFS_MOUNT_NONLM, ",nolock", "" }, 545 { NFS_MOUNT_NOACL, ",noacl", "" }, 546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 549 { 0, NULL, NULL } 550 }; 551 const struct proc_nfs_info *nfs_infop; 552 struct nfs_client *clp = nfss->nfs_client; 553 u32 version = clp->rpc_ops->version; 554 555 seq_printf(m, ",vers=%u", version); 556 seq_printf(m, ",rsize=%u", nfss->rsize); 557 seq_printf(m, ",wsize=%u", nfss->wsize); 558 if (nfss->bsize != 0) 559 seq_printf(m, ",bsize=%u", nfss->bsize); 560 seq_printf(m, ",namlen=%u", nfss->namelen); 561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 569 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 570 if (nfss->flags & nfs_infop->flag) 571 seq_puts(m, nfs_infop->str); 572 else 573 seq_puts(m, nfs_infop->nostr); 574 } 575 seq_printf(m, ",proto=%s", 576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); 577 if (version == 4) { 578 if (nfss->port != NFS_PORT) 579 seq_printf(m, ",port=%u", nfss->port); 580 } else 581 if (nfss->port) 582 seq_printf(m, ",port=%u", nfss->port); 583 584 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 585 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 587 588 if (version != 4) 589 nfs_show_mountd_options(m, nfss, showdefaults); 590 591 #ifdef CONFIG_NFS_V4 592 if (clp->rpc_ops->version == 4) 593 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 594 #endif 595 if (nfss->options & NFS_OPTION_FSCACHE) 596 seq_printf(m, ",fsc"); 597 } 598 599 /* 600 * Describe the mount options on this VFS mountpoint 601 */ 602 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 603 { 604 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 605 606 nfs_show_mount_options(m, nfss, 0); 607 608 seq_printf(m, ",addr=%s", 609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 610 RPC_DISPLAY_ADDR)); 611 612 return 0; 613 } 614 615 /* 616 * Present statistical information for this VFS mountpoint 617 */ 618 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 619 { 620 int i, cpu; 621 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 622 struct rpc_auth *auth = nfss->client->cl_auth; 623 struct nfs_iostats totals = { }; 624 625 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 626 627 /* 628 * Display all mount option settings 629 */ 630 seq_printf(m, "\n\topts:\t"); 631 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 632 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 633 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 634 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 635 nfs_show_mount_options(m, nfss, 1); 636 637 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 638 639 seq_printf(m, "\n\tcaps:\t"); 640 seq_printf(m, "caps=0x%x", nfss->caps); 641 seq_printf(m, ",wtmult=%u", nfss->wtmult); 642 seq_printf(m, ",dtsize=%u", nfss->dtsize); 643 seq_printf(m, ",bsize=%u", nfss->bsize); 644 seq_printf(m, ",namlen=%u", nfss->namelen); 645 646 #ifdef CONFIG_NFS_V4 647 if (nfss->nfs_client->rpc_ops->version == 4) { 648 seq_printf(m, "\n\tnfsv4:\t"); 649 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 650 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 652 } 653 #endif 654 655 /* 656 * Display security flavor in effect for this mount 657 */ 658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 659 if (auth->au_flavor) 660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 661 662 /* 663 * Display superblock I/O counters 664 */ 665 for_each_possible_cpu(cpu) { 666 struct nfs_iostats *stats; 667 668 preempt_disable(); 669 stats = per_cpu_ptr(nfss->io_stats, cpu); 670 671 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 672 totals.events[i] += stats->events[i]; 673 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 674 totals.bytes[i] += stats->bytes[i]; 675 #ifdef CONFIG_NFS_FSCACHE 676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 677 totals.fscache[i] += stats->fscache[i]; 678 #endif 679 680 preempt_enable(); 681 } 682 683 seq_printf(m, "\n\tevents:\t"); 684 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 685 seq_printf(m, "%lu ", totals.events[i]); 686 seq_printf(m, "\n\tbytes:\t"); 687 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 688 seq_printf(m, "%Lu ", totals.bytes[i]); 689 #ifdef CONFIG_NFS_FSCACHE 690 if (nfss->options & NFS_OPTION_FSCACHE) { 691 seq_printf(m, "\n\tfsc:\t"); 692 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 693 seq_printf(m, "%Lu ", totals.bytes[i]); 694 } 695 #endif 696 seq_printf(m, "\n"); 697 698 rpc_print_iostats(m, nfss->client); 699 700 return 0; 701 } 702 703 /* 704 * Begin unmount by attempting to remove all automounted mountpoints we added 705 * in response to xdev traversals and referrals 706 */ 707 static void nfs_umount_begin(struct super_block *sb) 708 { 709 struct nfs_server *server; 710 struct rpc_clnt *rpc; 711 712 lock_kernel(); 713 714 server = NFS_SB(sb); 715 /* -EIO all pending I/O */ 716 rpc = server->client_acl; 717 if (!IS_ERR(rpc)) 718 rpc_killall_tasks(rpc); 719 rpc = server->client; 720 if (!IS_ERR(rpc)) 721 rpc_killall_tasks(rpc); 722 723 unlock_kernel(); 724 } 725 726 /* 727 * Sanity-check a server address provided by the mount command. 728 * 729 * Address family must be initialized, and address must not be 730 * the ANY address for that family. 731 */ 732 static int nfs_verify_server_address(struct sockaddr *addr) 733 { 734 switch (addr->sa_family) { 735 case AF_INET: { 736 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 737 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 738 } 739 case AF_INET6: { 740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 741 return !ipv6_addr_any(sa); 742 } 743 } 744 745 return 0; 746 } 747 748 static void nfs_parse_ipv4_address(char *string, size_t str_len, 749 struct sockaddr *sap, size_t *addr_len) 750 { 751 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 752 u8 *addr = (u8 *)&sin->sin_addr.s_addr; 753 754 if (str_len <= INET_ADDRSTRLEN) { 755 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n", 756 (int)str_len, string); 757 758 sin->sin_family = AF_INET; 759 *addr_len = sizeof(*sin); 760 if (in4_pton(string, str_len, addr, '\0', NULL)) 761 return; 762 } 763 764 sap->sa_family = AF_UNSPEC; 765 *addr_len = 0; 766 } 767 768 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 769 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len, 770 const char *delim, 771 struct sockaddr_in6 *sin6) 772 { 773 char *p; 774 size_t len; 775 776 if ((string + str_len) == delim) 777 return 1; 778 779 if (*delim != IPV6_SCOPE_DELIMITER) 780 return 0; 781 782 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)) 783 return 0; 784 785 len = (string + str_len) - delim - 1; 786 p = kstrndup(delim + 1, len, GFP_KERNEL); 787 if (p) { 788 unsigned long scope_id = 0; 789 struct net_device *dev; 790 791 dev = dev_get_by_name(&init_net, p); 792 if (dev != NULL) { 793 scope_id = dev->ifindex; 794 dev_put(dev); 795 } else { 796 if (strict_strtoul(p, 10, &scope_id) == 0) { 797 kfree(p); 798 return 0; 799 } 800 } 801 802 kfree(p); 803 804 sin6->sin6_scope_id = scope_id; 805 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id); 806 return 1; 807 } 808 809 return 0; 810 } 811 812 static void nfs_parse_ipv6_address(char *string, size_t str_len, 813 struct sockaddr *sap, size_t *addr_len) 814 { 815 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 816 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u; 817 const char *delim; 818 819 if (str_len <= INET6_ADDRSTRLEN) { 820 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n", 821 (int)str_len, string); 822 823 sin6->sin6_family = AF_INET6; 824 *addr_len = sizeof(*sin6); 825 if (in6_pton(string, str_len, addr, 826 IPV6_SCOPE_DELIMITER, &delim) != 0) { 827 if (nfs_parse_ipv6_scope_id(string, str_len, 828 delim, sin6) != 0) 829 return; 830 } 831 } 832 833 sap->sa_family = AF_UNSPEC; 834 *addr_len = 0; 835 } 836 #else 837 static void nfs_parse_ipv6_address(char *string, size_t str_len, 838 struct sockaddr *sap, size_t *addr_len) 839 { 840 sap->sa_family = AF_UNSPEC; 841 *addr_len = 0; 842 } 843 #endif 844 845 /* 846 * Construct a sockaddr based on the contents of a string that contains 847 * an IP address in presentation format. 848 * 849 * If there is a problem constructing the new sockaddr, set the address 850 * family to AF_UNSPEC. 851 */ 852 void nfs_parse_ip_address(char *string, size_t str_len, 853 struct sockaddr *sap, size_t *addr_len) 854 { 855 unsigned int i, colons; 856 857 colons = 0; 858 for (i = 0; i < str_len; i++) 859 if (string[i] == ':') 860 colons++; 861 862 if (colons >= 2) 863 nfs_parse_ipv6_address(string, str_len, sap, addr_len); 864 else 865 nfs_parse_ipv4_address(string, str_len, sap, addr_len); 866 } 867 868 /* 869 * Sanity check the NFS transport protocol. 870 * 871 */ 872 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 873 { 874 switch (mnt->nfs_server.protocol) { 875 case XPRT_TRANSPORT_UDP: 876 case XPRT_TRANSPORT_TCP: 877 case XPRT_TRANSPORT_RDMA: 878 break; 879 default: 880 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 881 } 882 } 883 884 /* 885 * For text based NFSv2/v3 mounts, the mount protocol transport default 886 * settings should depend upon the specified NFS transport. 887 */ 888 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 889 { 890 nfs_validate_transport_protocol(mnt); 891 892 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 893 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 894 return; 895 switch (mnt->nfs_server.protocol) { 896 case XPRT_TRANSPORT_UDP: 897 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 898 break; 899 case XPRT_TRANSPORT_TCP: 900 case XPRT_TRANSPORT_RDMA: 901 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 902 } 903 } 904 905 /* 906 * Parse the value of the 'sec=' option. 907 * 908 * The flavor_len setting is for v4 mounts. 909 */ 910 static int nfs_parse_security_flavors(char *value, 911 struct nfs_parsed_mount_data *mnt) 912 { 913 substring_t args[MAX_OPT_ARGS]; 914 915 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 916 917 switch (match_token(value, nfs_secflavor_tokens, args)) { 918 case Opt_sec_none: 919 mnt->auth_flavor_len = 0; 920 mnt->auth_flavors[0] = RPC_AUTH_NULL; 921 break; 922 case Opt_sec_sys: 923 mnt->auth_flavor_len = 0; 924 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 925 break; 926 case Opt_sec_krb5: 927 mnt->auth_flavor_len = 1; 928 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 929 break; 930 case Opt_sec_krb5i: 931 mnt->auth_flavor_len = 1; 932 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 933 break; 934 case Opt_sec_krb5p: 935 mnt->auth_flavor_len = 1; 936 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 937 break; 938 case Opt_sec_lkey: 939 mnt->auth_flavor_len = 1; 940 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 941 break; 942 case Opt_sec_lkeyi: 943 mnt->auth_flavor_len = 1; 944 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 945 break; 946 case Opt_sec_lkeyp: 947 mnt->auth_flavor_len = 1; 948 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 949 break; 950 case Opt_sec_spkm: 951 mnt->auth_flavor_len = 1; 952 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 953 break; 954 case Opt_sec_spkmi: 955 mnt->auth_flavor_len = 1; 956 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 957 break; 958 case Opt_sec_spkmp: 959 mnt->auth_flavor_len = 1; 960 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 961 break; 962 default: 963 return 0; 964 } 965 966 return 1; 967 } 968 969 /* 970 * Error-check and convert a string of mount options from user space into 971 * a data structure. The whole mount string is processed; bad options are 972 * skipped as they are encountered. If there were no errors, return 1; 973 * otherwise return 0 (zero). 974 */ 975 static int nfs_parse_mount_options(char *raw, 976 struct nfs_parsed_mount_data *mnt) 977 { 978 char *p, *string, *secdata; 979 int rc, sloppy = 0, invalid_option = 0; 980 981 if (!raw) { 982 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 983 return 1; 984 } 985 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 986 987 secdata = alloc_secdata(); 988 if (!secdata) 989 goto out_nomem; 990 991 rc = security_sb_copy_data(raw, secdata); 992 if (rc) 993 goto out_security_failure; 994 995 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 996 if (rc) 997 goto out_security_failure; 998 999 free_secdata(secdata); 1000 1001 while ((p = strsep(&raw, ",")) != NULL) { 1002 substring_t args[MAX_OPT_ARGS]; 1003 unsigned long option; 1004 int int_option; 1005 int token; 1006 1007 if (!*p) 1008 continue; 1009 1010 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1011 1012 token = match_token(p, nfs_mount_option_tokens, args); 1013 switch (token) { 1014 1015 /* 1016 * boolean options: foo/nofoo 1017 */ 1018 case Opt_soft: 1019 mnt->flags |= NFS_MOUNT_SOFT; 1020 break; 1021 case Opt_hard: 1022 mnt->flags &= ~NFS_MOUNT_SOFT; 1023 break; 1024 case Opt_posix: 1025 mnt->flags |= NFS_MOUNT_POSIX; 1026 break; 1027 case Opt_noposix: 1028 mnt->flags &= ~NFS_MOUNT_POSIX; 1029 break; 1030 case Opt_cto: 1031 mnt->flags &= ~NFS_MOUNT_NOCTO; 1032 break; 1033 case Opt_nocto: 1034 mnt->flags |= NFS_MOUNT_NOCTO; 1035 break; 1036 case Opt_ac: 1037 mnt->flags &= ~NFS_MOUNT_NOAC; 1038 break; 1039 case Opt_noac: 1040 mnt->flags |= NFS_MOUNT_NOAC; 1041 break; 1042 case Opt_lock: 1043 mnt->flags &= ~NFS_MOUNT_NONLM; 1044 break; 1045 case Opt_nolock: 1046 mnt->flags |= NFS_MOUNT_NONLM; 1047 break; 1048 case Opt_v2: 1049 mnt->flags &= ~NFS_MOUNT_VER3; 1050 break; 1051 case Opt_v3: 1052 mnt->flags |= NFS_MOUNT_VER3; 1053 break; 1054 case Opt_udp: 1055 mnt->flags &= ~NFS_MOUNT_TCP; 1056 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1057 break; 1058 case Opt_tcp: 1059 mnt->flags |= NFS_MOUNT_TCP; 1060 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1061 break; 1062 case Opt_rdma: 1063 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1064 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1065 xprt_load_transport(p); 1066 break; 1067 case Opt_acl: 1068 mnt->flags &= ~NFS_MOUNT_NOACL; 1069 break; 1070 case Opt_noacl: 1071 mnt->flags |= NFS_MOUNT_NOACL; 1072 break; 1073 case Opt_rdirplus: 1074 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1075 break; 1076 case Opt_nordirplus: 1077 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1078 break; 1079 case Opt_sharecache: 1080 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1081 break; 1082 case Opt_nosharecache: 1083 mnt->flags |= NFS_MOUNT_UNSHARED; 1084 break; 1085 case Opt_resvport: 1086 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1087 break; 1088 case Opt_noresvport: 1089 mnt->flags |= NFS_MOUNT_NORESVPORT; 1090 break; 1091 case Opt_fscache: 1092 mnt->options |= NFS_OPTION_FSCACHE; 1093 kfree(mnt->fscache_uniq); 1094 mnt->fscache_uniq = NULL; 1095 break; 1096 case Opt_nofscache: 1097 mnt->options &= ~NFS_OPTION_FSCACHE; 1098 kfree(mnt->fscache_uniq); 1099 mnt->fscache_uniq = NULL; 1100 break; 1101 case Opt_fscache_uniq: 1102 string = match_strdup(args); 1103 if (!string) 1104 goto out_nomem; 1105 kfree(mnt->fscache_uniq); 1106 mnt->fscache_uniq = string; 1107 mnt->options |= NFS_OPTION_FSCACHE; 1108 break; 1109 1110 /* 1111 * options that take numeric values 1112 */ 1113 case Opt_port: 1114 string = match_strdup(args); 1115 if (string == NULL) 1116 goto out_nomem; 1117 rc = strict_strtoul(string, 10, &option); 1118 kfree(string); 1119 if (rc != 0 || option > USHORT_MAX) 1120 goto out_invalid_value; 1121 mnt->nfs_server.port = option; 1122 break; 1123 case Opt_rsize: 1124 string = match_strdup(args); 1125 if (string == NULL) 1126 goto out_nomem; 1127 rc = strict_strtoul(string, 10, &option); 1128 kfree(string); 1129 if (rc != 0) 1130 goto out_invalid_value; 1131 mnt->rsize = option; 1132 break; 1133 case Opt_wsize: 1134 string = match_strdup(args); 1135 if (string == NULL) 1136 goto out_nomem; 1137 rc = strict_strtoul(string, 10, &option); 1138 kfree(string); 1139 if (rc != 0) 1140 goto out_invalid_value; 1141 mnt->wsize = option; 1142 break; 1143 case Opt_bsize: 1144 string = match_strdup(args); 1145 if (string == NULL) 1146 goto out_nomem; 1147 rc = strict_strtoul(string, 10, &option); 1148 kfree(string); 1149 if (rc != 0) 1150 goto out_invalid_value; 1151 mnt->bsize = option; 1152 break; 1153 case Opt_timeo: 1154 string = match_strdup(args); 1155 if (string == NULL) 1156 goto out_nomem; 1157 rc = strict_strtoul(string, 10, &option); 1158 kfree(string); 1159 if (rc != 0 || option == 0) 1160 goto out_invalid_value; 1161 mnt->timeo = option; 1162 break; 1163 case Opt_retrans: 1164 string = match_strdup(args); 1165 if (string == NULL) 1166 goto out_nomem; 1167 rc = strict_strtoul(string, 10, &option); 1168 kfree(string); 1169 if (rc != 0 || option == 0) 1170 goto out_invalid_value; 1171 mnt->retrans = option; 1172 break; 1173 case Opt_acregmin: 1174 string = match_strdup(args); 1175 if (string == NULL) 1176 goto out_nomem; 1177 rc = strict_strtoul(string, 10, &option); 1178 kfree(string); 1179 if (rc != 0) 1180 goto out_invalid_value; 1181 mnt->acregmin = option; 1182 break; 1183 case Opt_acregmax: 1184 string = match_strdup(args); 1185 if (string == NULL) 1186 goto out_nomem; 1187 rc = strict_strtoul(string, 10, &option); 1188 kfree(string); 1189 if (rc != 0) 1190 goto out_invalid_value; 1191 mnt->acregmax = option; 1192 break; 1193 case Opt_acdirmin: 1194 string = match_strdup(args); 1195 if (string == NULL) 1196 goto out_nomem; 1197 rc = strict_strtoul(string, 10, &option); 1198 kfree(string); 1199 if (rc != 0) 1200 goto out_invalid_value; 1201 mnt->acdirmin = option; 1202 break; 1203 case Opt_acdirmax: 1204 string = match_strdup(args); 1205 if (string == NULL) 1206 goto out_nomem; 1207 rc = strict_strtoul(string, 10, &option); 1208 kfree(string); 1209 if (rc != 0) 1210 goto out_invalid_value; 1211 mnt->acdirmax = option; 1212 break; 1213 case Opt_actimeo: 1214 string = match_strdup(args); 1215 if (string == NULL) 1216 goto out_nomem; 1217 rc = strict_strtoul(string, 10, &option); 1218 kfree(string); 1219 if (rc != 0) 1220 goto out_invalid_value; 1221 mnt->acregmin = mnt->acregmax = 1222 mnt->acdirmin = mnt->acdirmax = option; 1223 break; 1224 case Opt_namelen: 1225 string = match_strdup(args); 1226 if (string == NULL) 1227 goto out_nomem; 1228 rc = strict_strtoul(string, 10, &option); 1229 kfree(string); 1230 if (rc != 0) 1231 goto out_invalid_value; 1232 mnt->namlen = option; 1233 break; 1234 case Opt_mountport: 1235 string = match_strdup(args); 1236 if (string == NULL) 1237 goto out_nomem; 1238 rc = strict_strtoul(string, 10, &option); 1239 kfree(string); 1240 if (rc != 0 || option > USHORT_MAX) 1241 goto out_invalid_value; 1242 mnt->mount_server.port = option; 1243 break; 1244 case Opt_mountvers: 1245 string = match_strdup(args); 1246 if (string == NULL) 1247 goto out_nomem; 1248 rc = strict_strtoul(string, 10, &option); 1249 kfree(string); 1250 if (rc != 0 || 1251 option < NFS_MNT_VERSION || 1252 option > NFS_MNT3_VERSION) 1253 goto out_invalid_value; 1254 mnt->mount_server.version = option; 1255 break; 1256 case Opt_nfsvers: 1257 string = match_strdup(args); 1258 if (string == NULL) 1259 goto out_nomem; 1260 rc = strict_strtoul(string, 10, &option); 1261 kfree(string); 1262 if (rc != 0) 1263 goto out_invalid_value; 1264 switch (option) { 1265 case NFS2_VERSION: 1266 mnt->flags &= ~NFS_MOUNT_VER3; 1267 break; 1268 case NFS3_VERSION: 1269 mnt->flags |= NFS_MOUNT_VER3; 1270 break; 1271 default: 1272 goto out_invalid_value; 1273 } 1274 break; 1275 case Opt_minorversion: 1276 if (match_int(args, &int_option)) 1277 return 0; 1278 if (int_option < 0 || int_option > NFS4_MAX_MINOR_VERSION) 1279 return 0; 1280 mnt->minorversion = int_option; 1281 break; 1282 1283 /* 1284 * options that take text values 1285 */ 1286 case Opt_sec: 1287 string = match_strdup(args); 1288 if (string == NULL) 1289 goto out_nomem; 1290 rc = nfs_parse_security_flavors(string, mnt); 1291 kfree(string); 1292 if (!rc) { 1293 dfprintk(MOUNT, "NFS: unrecognized " 1294 "security flavor\n"); 1295 return 0; 1296 } 1297 break; 1298 case Opt_proto: 1299 string = match_strdup(args); 1300 if (string == NULL) 1301 goto out_nomem; 1302 token = match_token(string, 1303 nfs_xprt_protocol_tokens, args); 1304 1305 switch (token) { 1306 case Opt_xprt_udp: 1307 mnt->flags &= ~NFS_MOUNT_TCP; 1308 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1309 kfree(string); 1310 break; 1311 case Opt_xprt_tcp: 1312 mnt->flags |= NFS_MOUNT_TCP; 1313 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1314 kfree(string); 1315 break; 1316 case Opt_xprt_rdma: 1317 /* vector side protocols to TCP */ 1318 mnt->flags |= NFS_MOUNT_TCP; 1319 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1320 xprt_load_transport(string); 1321 kfree(string); 1322 break; 1323 default: 1324 dfprintk(MOUNT, "NFS: unrecognized " 1325 "transport protocol\n"); 1326 return 0; 1327 } 1328 break; 1329 case Opt_mountproto: 1330 string = match_strdup(args); 1331 if (string == NULL) 1332 goto out_nomem; 1333 token = match_token(string, 1334 nfs_xprt_protocol_tokens, args); 1335 kfree(string); 1336 1337 switch (token) { 1338 case Opt_xprt_udp: 1339 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1340 break; 1341 case Opt_xprt_tcp: 1342 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1343 break; 1344 case Opt_xprt_rdma: /* not used for side protocols */ 1345 default: 1346 dfprintk(MOUNT, "NFS: unrecognized " 1347 "transport protocol\n"); 1348 return 0; 1349 } 1350 break; 1351 case Opt_addr: 1352 string = match_strdup(args); 1353 if (string == NULL) 1354 goto out_nomem; 1355 nfs_parse_ip_address(string, strlen(string), 1356 (struct sockaddr *) 1357 &mnt->nfs_server.address, 1358 &mnt->nfs_server.addrlen); 1359 kfree(string); 1360 break; 1361 case Opt_clientaddr: 1362 string = match_strdup(args); 1363 if (string == NULL) 1364 goto out_nomem; 1365 kfree(mnt->client_address); 1366 mnt->client_address = string; 1367 break; 1368 case Opt_mounthost: 1369 string = match_strdup(args); 1370 if (string == NULL) 1371 goto out_nomem; 1372 kfree(mnt->mount_server.hostname); 1373 mnt->mount_server.hostname = string; 1374 break; 1375 case Opt_mountaddr: 1376 string = match_strdup(args); 1377 if (string == NULL) 1378 goto out_nomem; 1379 nfs_parse_ip_address(string, strlen(string), 1380 (struct sockaddr *) 1381 &mnt->mount_server.address, 1382 &mnt->mount_server.addrlen); 1383 kfree(string); 1384 break; 1385 case Opt_lookupcache: 1386 string = match_strdup(args); 1387 if (string == NULL) 1388 goto out_nomem; 1389 token = match_token(string, 1390 nfs_lookupcache_tokens, args); 1391 kfree(string); 1392 switch (token) { 1393 case Opt_lookupcache_all: 1394 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1395 break; 1396 case Opt_lookupcache_positive: 1397 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1398 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1399 break; 1400 case Opt_lookupcache_none: 1401 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1402 break; 1403 default: 1404 dfprintk(MOUNT, "NFS: invalid " 1405 "lookupcache argument\n"); 1406 return 0; 1407 }; 1408 break; 1409 1410 /* 1411 * Special options 1412 */ 1413 case Opt_sloppy: 1414 sloppy = 1; 1415 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1416 break; 1417 case Opt_userspace: 1418 case Opt_deprecated: 1419 dfprintk(MOUNT, "NFS: ignoring mount option " 1420 "'%s'\n", p); 1421 break; 1422 1423 default: 1424 invalid_option = 1; 1425 dfprintk(MOUNT, "NFS: unrecognized mount option " 1426 "'%s'\n", p); 1427 } 1428 } 1429 1430 if (!sloppy && invalid_option) 1431 return 0; 1432 1433 return 1; 1434 1435 out_invalid_value: 1436 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p); 1437 return 0; 1438 out_nomem: 1439 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1440 return 0; 1441 out_security_failure: 1442 free_secdata(secdata); 1443 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1444 return 0; 1445 } 1446 1447 /* 1448 * Use the remote server's MOUNT service to request the NFS file handle 1449 * corresponding to the provided path. 1450 */ 1451 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1452 struct nfs_fh *root_fh) 1453 { 1454 unsigned int auth_flavor_len = 0; 1455 struct nfs_mount_request request = { 1456 .sap = (struct sockaddr *) 1457 &args->mount_server.address, 1458 .dirpath = args->nfs_server.export_path, 1459 .protocol = args->mount_server.protocol, 1460 .fh = root_fh, 1461 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1462 .auth_flav_len = &auth_flavor_len, 1463 }; 1464 int status; 1465 1466 if (args->mount_server.version == 0) { 1467 if (args->flags & NFS_MOUNT_VER3) 1468 args->mount_server.version = NFS_MNT3_VERSION; 1469 else 1470 args->mount_server.version = NFS_MNT_VERSION; 1471 } 1472 request.version = args->mount_server.version; 1473 1474 if (args->mount_server.hostname) 1475 request.hostname = args->mount_server.hostname; 1476 else 1477 request.hostname = args->nfs_server.hostname; 1478 1479 /* 1480 * Construct the mount server's address. 1481 */ 1482 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1483 memcpy(request.sap, &args->nfs_server.address, 1484 args->nfs_server.addrlen); 1485 args->mount_server.addrlen = args->nfs_server.addrlen; 1486 } 1487 request.salen = args->mount_server.addrlen; 1488 1489 /* 1490 * autobind will be used if mount_server.port == 0 1491 */ 1492 nfs_set_port(request.sap, args->mount_server.port); 1493 1494 /* 1495 * Now ask the mount server to map our export path 1496 * to a file handle. 1497 */ 1498 status = nfs_mount(&request); 1499 if (status == 0) 1500 return 0; 1501 1502 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1503 request.hostname, status); 1504 return status; 1505 } 1506 1507 static int nfs_parse_simple_hostname(const char *dev_name, 1508 char **hostname, size_t maxnamlen, 1509 char **export_path, size_t maxpathlen) 1510 { 1511 size_t len; 1512 char *colon, *comma; 1513 1514 colon = strchr(dev_name, ':'); 1515 if (colon == NULL) 1516 goto out_bad_devname; 1517 1518 len = colon - dev_name; 1519 if (len > maxnamlen) 1520 goto out_hostname; 1521 1522 /* N.B. caller will free nfs_server.hostname in all cases */ 1523 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1524 if (!*hostname) 1525 goto out_nomem; 1526 1527 /* kill possible hostname list: not supported */ 1528 comma = strchr(*hostname, ','); 1529 if (comma != NULL) { 1530 if (comma == *hostname) 1531 goto out_bad_devname; 1532 *comma = '\0'; 1533 } 1534 1535 colon++; 1536 len = strlen(colon); 1537 if (len > maxpathlen) 1538 goto out_path; 1539 *export_path = kstrndup(colon, len, GFP_KERNEL); 1540 if (!*export_path) 1541 goto out_nomem; 1542 1543 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1544 return 0; 1545 1546 out_bad_devname: 1547 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1548 return -EINVAL; 1549 1550 out_nomem: 1551 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1552 return -ENOMEM; 1553 1554 out_hostname: 1555 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1556 return -ENAMETOOLONG; 1557 1558 out_path: 1559 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1560 return -ENAMETOOLONG; 1561 } 1562 1563 /* 1564 * Hostname has square brackets around it because it contains one or 1565 * more colons. We look for the first closing square bracket, and a 1566 * colon must follow it. 1567 */ 1568 static int nfs_parse_protected_hostname(const char *dev_name, 1569 char **hostname, size_t maxnamlen, 1570 char **export_path, size_t maxpathlen) 1571 { 1572 size_t len; 1573 char *start, *end; 1574 1575 start = (char *)(dev_name + 1); 1576 1577 end = strchr(start, ']'); 1578 if (end == NULL) 1579 goto out_bad_devname; 1580 if (*(end + 1) != ':') 1581 goto out_bad_devname; 1582 1583 len = end - start; 1584 if (len > maxnamlen) 1585 goto out_hostname; 1586 1587 /* N.B. caller will free nfs_server.hostname in all cases */ 1588 *hostname = kstrndup(start, len, GFP_KERNEL); 1589 if (*hostname == NULL) 1590 goto out_nomem; 1591 1592 end += 2; 1593 len = strlen(end); 1594 if (len > maxpathlen) 1595 goto out_path; 1596 *export_path = kstrndup(end, len, GFP_KERNEL); 1597 if (!*export_path) 1598 goto out_nomem; 1599 1600 return 0; 1601 1602 out_bad_devname: 1603 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1604 return -EINVAL; 1605 1606 out_nomem: 1607 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1608 return -ENOMEM; 1609 1610 out_hostname: 1611 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1612 return -ENAMETOOLONG; 1613 1614 out_path: 1615 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1616 return -ENAMETOOLONG; 1617 } 1618 1619 /* 1620 * Split "dev_name" into "hostname:export_path". 1621 * 1622 * The leftmost colon demarks the split between the server's hostname 1623 * and the export path. If the hostname starts with a left square 1624 * bracket, then it may contain colons. 1625 * 1626 * Note: caller frees hostname and export path, even on error. 1627 */ 1628 static int nfs_parse_devname(const char *dev_name, 1629 char **hostname, size_t maxnamlen, 1630 char **export_path, size_t maxpathlen) 1631 { 1632 if (*dev_name == '[') 1633 return nfs_parse_protected_hostname(dev_name, 1634 hostname, maxnamlen, 1635 export_path, maxpathlen); 1636 1637 return nfs_parse_simple_hostname(dev_name, 1638 hostname, maxnamlen, 1639 export_path, maxpathlen); 1640 } 1641 1642 /* 1643 * Validate the NFS2/NFS3 mount data 1644 * - fills in the mount root filehandle 1645 * 1646 * For option strings, user space handles the following behaviors: 1647 * 1648 * + DNS: mapping server host name to IP address ("addr=" option) 1649 * 1650 * + failure mode: how to behave if a mount request can't be handled 1651 * immediately ("fg/bg" option) 1652 * 1653 * + retry: how often to retry a mount request ("retry=" option) 1654 * 1655 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1656 * mountproto=tcp after mountproto=udp, and so on 1657 */ 1658 static int nfs_validate_mount_data(void *options, 1659 struct nfs_parsed_mount_data *args, 1660 struct nfs_fh *mntfh, 1661 const char *dev_name) 1662 { 1663 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1664 1665 if (data == NULL) 1666 goto out_no_data; 1667 1668 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); 1669 args->rsize = NFS_MAX_FILE_IO_SIZE; 1670 args->wsize = NFS_MAX_FILE_IO_SIZE; 1671 args->acregmin = NFS_DEF_ACREGMIN; 1672 args->acregmax = NFS_DEF_ACREGMAX; 1673 args->acdirmin = NFS_DEF_ACDIRMIN; 1674 args->acdirmax = NFS_DEF_ACDIRMAX; 1675 args->mount_server.port = 0; /* autobind unless user sets port */ 1676 args->nfs_server.port = 0; /* autobind unless user sets port */ 1677 args->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1678 args->auth_flavors[0] = RPC_AUTH_UNIX; 1679 1680 switch (data->version) { 1681 case 1: 1682 data->namlen = 0; 1683 case 2: 1684 data->bsize = 0; 1685 case 3: 1686 if (data->flags & NFS_MOUNT_VER3) 1687 goto out_no_v3; 1688 data->root.size = NFS2_FHSIZE; 1689 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1690 case 4: 1691 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1692 goto out_no_sec; 1693 case 5: 1694 memset(data->context, 0, sizeof(data->context)); 1695 case 6: 1696 if (data->flags & NFS_MOUNT_VER3) { 1697 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1698 goto out_invalid_fh; 1699 mntfh->size = data->root.size; 1700 } else 1701 mntfh->size = NFS2_FHSIZE; 1702 1703 1704 memcpy(mntfh->data, data->root.data, mntfh->size); 1705 if (mntfh->size < sizeof(mntfh->data)) 1706 memset(mntfh->data + mntfh->size, 0, 1707 sizeof(mntfh->data) - mntfh->size); 1708 1709 /* 1710 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1711 * can deal with. 1712 */ 1713 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1714 args->rsize = data->rsize; 1715 args->wsize = data->wsize; 1716 args->timeo = data->timeo; 1717 args->retrans = data->retrans; 1718 args->acregmin = data->acregmin; 1719 args->acregmax = data->acregmax; 1720 args->acdirmin = data->acdirmin; 1721 args->acdirmax = data->acdirmax; 1722 1723 memcpy(&args->nfs_server.address, &data->addr, 1724 sizeof(data->addr)); 1725 args->nfs_server.addrlen = sizeof(data->addr); 1726 if (!nfs_verify_server_address((struct sockaddr *) 1727 &args->nfs_server.address)) 1728 goto out_no_address; 1729 1730 if (!(data->flags & NFS_MOUNT_TCP)) 1731 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1732 /* N.B. caller will free nfs_server.hostname in all cases */ 1733 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1734 args->namlen = data->namlen; 1735 args->bsize = data->bsize; 1736 1737 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1738 args->auth_flavors[0] = data->pseudoflavor; 1739 if (!args->nfs_server.hostname) 1740 goto out_nomem; 1741 1742 /* 1743 * The legacy version 6 binary mount data from userspace has a 1744 * field used only to transport selinux information into the 1745 * the kernel. To continue to support that functionality we 1746 * have a touch of selinux knowledge here in the NFS code. The 1747 * userspace code converted context=blah to just blah so we are 1748 * converting back to the full string selinux understands. 1749 */ 1750 if (data->context[0]){ 1751 #ifdef CONFIG_SECURITY_SELINUX 1752 int rc; 1753 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1754 if (!opts_str) 1755 return -ENOMEM; 1756 strcpy(opts_str, "context="); 1757 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1758 strcat(opts_str, &data->context[0]); 1759 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1760 kfree(opts_str); 1761 if (rc) 1762 return rc; 1763 #else 1764 return -EINVAL; 1765 #endif 1766 } 1767 1768 break; 1769 default: { 1770 int status; 1771 1772 if (nfs_parse_mount_options((char *)options, args) == 0) 1773 return -EINVAL; 1774 1775 if (!nfs_verify_server_address((struct sockaddr *) 1776 &args->nfs_server.address)) 1777 goto out_no_address; 1778 1779 nfs_set_port((struct sockaddr *)&args->nfs_server.address, 1780 args->nfs_server.port); 1781 1782 nfs_set_mount_transport_protocol(args); 1783 1784 status = nfs_parse_devname(dev_name, 1785 &args->nfs_server.hostname, 1786 PAGE_SIZE, 1787 &args->nfs_server.export_path, 1788 NFS_MAXPATHLEN); 1789 if (!status) 1790 status = nfs_try_mount(args, mntfh); 1791 1792 kfree(args->nfs_server.export_path); 1793 args->nfs_server.export_path = NULL; 1794 1795 if (status) 1796 return status; 1797 1798 break; 1799 } 1800 } 1801 1802 #ifndef CONFIG_NFS_V3 1803 if (args->flags & NFS_MOUNT_VER3) 1804 goto out_v3_not_compiled; 1805 #endif /* !CONFIG_NFS_V3 */ 1806 1807 return 0; 1808 1809 out_no_data: 1810 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1811 return -EINVAL; 1812 1813 out_no_v3: 1814 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1815 data->version); 1816 return -EINVAL; 1817 1818 out_no_sec: 1819 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1820 return -EINVAL; 1821 1822 #ifndef CONFIG_NFS_V3 1823 out_v3_not_compiled: 1824 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1825 return -EPROTONOSUPPORT; 1826 #endif /* !CONFIG_NFS_V3 */ 1827 1828 out_nomem: 1829 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1830 return -ENOMEM; 1831 1832 out_no_address: 1833 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1834 return -EINVAL; 1835 1836 out_invalid_fh: 1837 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1838 return -EINVAL; 1839 } 1840 1841 static int 1842 nfs_compare_remount_data(struct nfs_server *nfss, 1843 struct nfs_parsed_mount_data *data) 1844 { 1845 if (data->flags != nfss->flags || 1846 data->rsize != nfss->rsize || 1847 data->wsize != nfss->wsize || 1848 data->retrans != nfss->client->cl_timeout->to_retries || 1849 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1850 data->acregmin != nfss->acregmin / HZ || 1851 data->acregmax != nfss->acregmax / HZ || 1852 data->acdirmin != nfss->acdirmin / HZ || 1853 data->acdirmax != nfss->acdirmax / HZ || 1854 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1855 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1856 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1857 data->nfs_server.addrlen) != 0) 1858 return -EINVAL; 1859 1860 return 0; 1861 } 1862 1863 static int 1864 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1865 { 1866 int error; 1867 struct nfs_server *nfss = sb->s_fs_info; 1868 struct nfs_parsed_mount_data *data; 1869 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1870 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1871 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1872 1873 /* 1874 * Userspace mount programs that send binary options generally send 1875 * them populated with default values. We have no way to know which 1876 * ones were explicitly specified. Fall back to legacy behavior and 1877 * just return success. 1878 */ 1879 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1880 (nfsvers <= 3 && (!options || (options->version >= 1 && 1881 options->version <= 6)))) 1882 return 0; 1883 1884 data = kzalloc(sizeof(*data), GFP_KERNEL); 1885 if (data == NULL) 1886 return -ENOMEM; 1887 1888 lock_kernel(); 1889 /* fill out struct with values from existing mount */ 1890 data->flags = nfss->flags; 1891 data->rsize = nfss->rsize; 1892 data->wsize = nfss->wsize; 1893 data->retrans = nfss->client->cl_timeout->to_retries; 1894 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1895 data->acregmin = nfss->acregmin / HZ; 1896 data->acregmax = nfss->acregmax / HZ; 1897 data->acdirmin = nfss->acdirmin / HZ; 1898 data->acdirmax = nfss->acdirmax / HZ; 1899 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1900 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1901 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1902 data->nfs_server.addrlen); 1903 1904 /* overwrite those values with any that were specified */ 1905 error = nfs_parse_mount_options((char *)options, data); 1906 if (error < 0) 1907 goto out; 1908 1909 /* compare new mount options with old ones */ 1910 error = nfs_compare_remount_data(nfss, data); 1911 out: 1912 kfree(data); 1913 unlock_kernel(); 1914 return error; 1915 } 1916 1917 /* 1918 * Initialise the common bits of the superblock 1919 */ 1920 static inline void nfs_initialise_sb(struct super_block *sb) 1921 { 1922 struct nfs_server *server = NFS_SB(sb); 1923 1924 sb->s_magic = NFS_SUPER_MAGIC; 1925 1926 /* We probably want something more informative here */ 1927 snprintf(sb->s_id, sizeof(sb->s_id), 1928 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1929 1930 if (sb->s_blocksize == 0) 1931 sb->s_blocksize = nfs_block_bits(server->wsize, 1932 &sb->s_blocksize_bits); 1933 1934 if (server->flags & NFS_MOUNT_NOAC) 1935 sb->s_flags |= MS_SYNCHRONOUS; 1936 1937 nfs_super_set_maxbytes(sb, server->maxfilesize); 1938 } 1939 1940 /* 1941 * Finish setting up an NFS2/3 superblock 1942 */ 1943 static void nfs_fill_super(struct super_block *sb, 1944 struct nfs_parsed_mount_data *data) 1945 { 1946 struct nfs_server *server = NFS_SB(sb); 1947 1948 sb->s_blocksize_bits = 0; 1949 sb->s_blocksize = 0; 1950 if (data->bsize) 1951 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 1952 1953 if (server->flags & NFS_MOUNT_VER3) { 1954 /* The VFS shouldn't apply the umask to mode bits. We will do 1955 * so ourselves when necessary. 1956 */ 1957 sb->s_flags |= MS_POSIXACL; 1958 sb->s_time_gran = 1; 1959 } 1960 1961 sb->s_op = &nfs_sops; 1962 nfs_initialise_sb(sb); 1963 } 1964 1965 /* 1966 * Finish setting up a cloned NFS2/3 superblock 1967 */ 1968 static void nfs_clone_super(struct super_block *sb, 1969 const struct super_block *old_sb) 1970 { 1971 struct nfs_server *server = NFS_SB(sb); 1972 1973 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 1974 sb->s_blocksize = old_sb->s_blocksize; 1975 sb->s_maxbytes = old_sb->s_maxbytes; 1976 1977 if (server->flags & NFS_MOUNT_VER3) { 1978 /* The VFS shouldn't apply the umask to mode bits. We will do 1979 * so ourselves when necessary. 1980 */ 1981 sb->s_flags |= MS_POSIXACL; 1982 sb->s_time_gran = 1; 1983 } 1984 1985 sb->s_op = old_sb->s_op; 1986 nfs_initialise_sb(sb); 1987 } 1988 1989 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 1990 { 1991 const struct nfs_server *a = s->s_fs_info; 1992 const struct rpc_clnt *clnt_a = a->client; 1993 const struct rpc_clnt *clnt_b = b->client; 1994 1995 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 1996 goto Ebusy; 1997 if (a->nfs_client != b->nfs_client) 1998 goto Ebusy; 1999 if (a->flags != b->flags) 2000 goto Ebusy; 2001 if (a->wsize != b->wsize) 2002 goto Ebusy; 2003 if (a->rsize != b->rsize) 2004 goto Ebusy; 2005 if (a->acregmin != b->acregmin) 2006 goto Ebusy; 2007 if (a->acregmax != b->acregmax) 2008 goto Ebusy; 2009 if (a->acdirmin != b->acdirmin) 2010 goto Ebusy; 2011 if (a->acdirmax != b->acdirmax) 2012 goto Ebusy; 2013 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2014 goto Ebusy; 2015 return 1; 2016 Ebusy: 2017 return 0; 2018 } 2019 2020 struct nfs_sb_mountdata { 2021 struct nfs_server *server; 2022 int mntflags; 2023 }; 2024 2025 static int nfs_set_super(struct super_block *s, void *data) 2026 { 2027 struct nfs_sb_mountdata *sb_mntdata = data; 2028 struct nfs_server *server = sb_mntdata->server; 2029 int ret; 2030 2031 s->s_flags = sb_mntdata->mntflags; 2032 s->s_fs_info = server; 2033 ret = set_anon_super(s, server); 2034 if (ret == 0) 2035 server->s_dev = s->s_dev; 2036 return ret; 2037 } 2038 2039 static int nfs_compare_super_address(struct nfs_server *server1, 2040 struct nfs_server *server2) 2041 { 2042 struct sockaddr *sap1, *sap2; 2043 2044 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2045 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2046 2047 if (sap1->sa_family != sap2->sa_family) 2048 return 0; 2049 2050 switch (sap1->sa_family) { 2051 case AF_INET: { 2052 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2053 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2054 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2055 return 0; 2056 if (sin1->sin_port != sin2->sin_port) 2057 return 0; 2058 break; 2059 } 2060 case AF_INET6: { 2061 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2062 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2063 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2064 return 0; 2065 if (sin1->sin6_port != sin2->sin6_port) 2066 return 0; 2067 break; 2068 } 2069 default: 2070 return 0; 2071 } 2072 2073 return 1; 2074 } 2075 2076 static int nfs_compare_super(struct super_block *sb, void *data) 2077 { 2078 struct nfs_sb_mountdata *sb_mntdata = data; 2079 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2080 int mntflags = sb_mntdata->mntflags; 2081 2082 if (!nfs_compare_super_address(old, server)) 2083 return 0; 2084 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2085 if (old->flags & NFS_MOUNT_UNSHARED) 2086 return 0; 2087 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2088 return 0; 2089 return nfs_compare_mount_options(sb, server, mntflags); 2090 } 2091 2092 static int nfs_bdi_register(struct nfs_server *server) 2093 { 2094 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2095 } 2096 2097 static int nfs_get_sb(struct file_system_type *fs_type, 2098 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2099 { 2100 struct nfs_server *server = NULL; 2101 struct super_block *s; 2102 struct nfs_parsed_mount_data *data; 2103 struct nfs_fh *mntfh; 2104 struct dentry *mntroot; 2105 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2106 struct nfs_sb_mountdata sb_mntdata = { 2107 .mntflags = flags, 2108 }; 2109 int error = -ENOMEM; 2110 2111 data = kzalloc(sizeof(*data), GFP_KERNEL); 2112 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2113 if (data == NULL || mntfh == NULL) 2114 goto out_free_fh; 2115 2116 security_init_mnt_opts(&data->lsm_opts); 2117 2118 /* Validate the mount data */ 2119 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2120 if (error < 0) 2121 goto out; 2122 2123 /* Get a volume representation */ 2124 server = nfs_create_server(data, mntfh); 2125 if (IS_ERR(server)) { 2126 error = PTR_ERR(server); 2127 goto out; 2128 } 2129 sb_mntdata.server = server; 2130 2131 if (server->flags & NFS_MOUNT_UNSHARED) 2132 compare_super = NULL; 2133 2134 /* Get a superblock - note that we may end up sharing one that already exists */ 2135 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2136 if (IS_ERR(s)) { 2137 error = PTR_ERR(s); 2138 goto out_err_nosb; 2139 } 2140 2141 if (s->s_fs_info != server) { 2142 nfs_free_server(server); 2143 server = NULL; 2144 } else { 2145 error = nfs_bdi_register(server); 2146 if (error) 2147 goto error_splat_super; 2148 } 2149 2150 if (!s->s_root) { 2151 /* initial superblock/root creation */ 2152 nfs_fill_super(s, data); 2153 nfs_fscache_get_super_cookie(s, data); 2154 } 2155 2156 mntroot = nfs_get_root(s, mntfh); 2157 if (IS_ERR(mntroot)) { 2158 error = PTR_ERR(mntroot); 2159 goto error_splat_super; 2160 } 2161 2162 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2163 if (error) 2164 goto error_splat_root; 2165 2166 s->s_flags |= MS_ACTIVE; 2167 mnt->mnt_sb = s; 2168 mnt->mnt_root = mntroot; 2169 error = 0; 2170 2171 out: 2172 kfree(data->nfs_server.hostname); 2173 kfree(data->mount_server.hostname); 2174 kfree(data->fscache_uniq); 2175 security_free_mnt_opts(&data->lsm_opts); 2176 out_free_fh: 2177 kfree(mntfh); 2178 kfree(data); 2179 return error; 2180 2181 out_err_nosb: 2182 nfs_free_server(server); 2183 goto out; 2184 2185 error_splat_root: 2186 dput(mntroot); 2187 error_splat_super: 2188 deactivate_locked_super(s); 2189 goto out; 2190 } 2191 2192 /* 2193 * Destroy an NFS2/3 superblock 2194 */ 2195 static void nfs_kill_super(struct super_block *s) 2196 { 2197 struct nfs_server *server = NFS_SB(s); 2198 2199 bdi_unregister(&server->backing_dev_info); 2200 kill_anon_super(s); 2201 nfs_fscache_release_super_cookie(s); 2202 nfs_free_server(server); 2203 } 2204 2205 /* 2206 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2207 */ 2208 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2209 const char *dev_name, void *raw_data, 2210 struct vfsmount *mnt) 2211 { 2212 struct nfs_clone_mount *data = raw_data; 2213 struct super_block *s; 2214 struct nfs_server *server; 2215 struct dentry *mntroot; 2216 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2217 struct nfs_sb_mountdata sb_mntdata = { 2218 .mntflags = flags, 2219 }; 2220 int error; 2221 2222 dprintk("--> nfs_xdev_get_sb()\n"); 2223 2224 /* create a new volume representation */ 2225 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2226 if (IS_ERR(server)) { 2227 error = PTR_ERR(server); 2228 goto out_err_noserver; 2229 } 2230 sb_mntdata.server = server; 2231 2232 if (server->flags & NFS_MOUNT_UNSHARED) 2233 compare_super = NULL; 2234 2235 /* Get a superblock - note that we may end up sharing one that already exists */ 2236 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2237 if (IS_ERR(s)) { 2238 error = PTR_ERR(s); 2239 goto out_err_nosb; 2240 } 2241 2242 if (s->s_fs_info != server) { 2243 nfs_free_server(server); 2244 server = NULL; 2245 } else { 2246 error = nfs_bdi_register(server); 2247 if (error) 2248 goto error_splat_super; 2249 } 2250 2251 if (!s->s_root) { 2252 /* initial superblock/root creation */ 2253 nfs_clone_super(s, data->sb); 2254 } 2255 2256 mntroot = nfs_get_root(s, data->fh); 2257 if (IS_ERR(mntroot)) { 2258 error = PTR_ERR(mntroot); 2259 goto error_splat_super; 2260 } 2261 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2262 dput(mntroot); 2263 error = -ESTALE; 2264 goto error_splat_super; 2265 } 2266 2267 s->s_flags |= MS_ACTIVE; 2268 mnt->mnt_sb = s; 2269 mnt->mnt_root = mntroot; 2270 2271 /* clone any lsm security options from the parent to the new sb */ 2272 security_sb_clone_mnt_opts(data->sb, s); 2273 2274 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2275 return 0; 2276 2277 out_err_nosb: 2278 nfs_free_server(server); 2279 out_err_noserver: 2280 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2281 return error; 2282 2283 error_splat_super: 2284 deactivate_locked_super(s); 2285 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2286 return error; 2287 } 2288 2289 #ifdef CONFIG_NFS_V4 2290 2291 /* 2292 * Finish setting up a cloned NFS4 superblock 2293 */ 2294 static void nfs4_clone_super(struct super_block *sb, 2295 const struct super_block *old_sb) 2296 { 2297 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2298 sb->s_blocksize = old_sb->s_blocksize; 2299 sb->s_maxbytes = old_sb->s_maxbytes; 2300 sb->s_time_gran = 1; 2301 sb->s_op = old_sb->s_op; 2302 nfs_initialise_sb(sb); 2303 } 2304 2305 /* 2306 * Set up an NFS4 superblock 2307 */ 2308 static void nfs4_fill_super(struct super_block *sb) 2309 { 2310 sb->s_time_gran = 1; 2311 sb->s_op = &nfs4_sops; 2312 nfs_initialise_sb(sb); 2313 } 2314 2315 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2316 { 2317 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2318 } 2319 2320 /* 2321 * Validate NFSv4 mount options 2322 */ 2323 static int nfs4_validate_mount_data(void *options, 2324 struct nfs_parsed_mount_data *args, 2325 const char *dev_name) 2326 { 2327 struct sockaddr_in *ap; 2328 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2329 char *c; 2330 2331 if (data == NULL) 2332 goto out_no_data; 2333 2334 args->rsize = NFS_MAX_FILE_IO_SIZE; 2335 args->wsize = NFS_MAX_FILE_IO_SIZE; 2336 args->acregmin = NFS_DEF_ACREGMIN; 2337 args->acregmax = NFS_DEF_ACREGMAX; 2338 args->acdirmin = NFS_DEF_ACDIRMIN; 2339 args->acdirmax = NFS_DEF_ACDIRMAX; 2340 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */ 2341 args->auth_flavors[0] = RPC_AUTH_UNIX; 2342 args->auth_flavor_len = 0; 2343 args->minorversion = 0; 2344 2345 switch (data->version) { 2346 case 1: 2347 ap = (struct sockaddr_in *)&args->nfs_server.address; 2348 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2349 goto out_no_address; 2350 if (data->host_addrlen == 0) 2351 goto out_no_address; 2352 args->nfs_server.addrlen = data->host_addrlen; 2353 if (copy_from_user(ap, data->host_addr, data->host_addrlen)) 2354 return -EFAULT; 2355 if (!nfs_verify_server_address((struct sockaddr *) 2356 &args->nfs_server.address)) 2357 goto out_no_address; 2358 2359 if (data->auth_flavourlen) { 2360 if (data->auth_flavourlen > 1) 2361 goto out_inval_auth; 2362 if (copy_from_user(&args->auth_flavors[0], 2363 data->auth_flavours, 2364 sizeof(args->auth_flavors[0]))) 2365 return -EFAULT; 2366 } 2367 2368 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2369 if (IS_ERR(c)) 2370 return PTR_ERR(c); 2371 args->nfs_server.hostname = c; 2372 2373 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2374 if (IS_ERR(c)) 2375 return PTR_ERR(c); 2376 args->nfs_server.export_path = c; 2377 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2378 2379 c = strndup_user(data->client_addr.data, 16); 2380 if (IS_ERR(c)) 2381 return PTR_ERR(c); 2382 args->client_address = c; 2383 2384 /* 2385 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2386 * can deal with. 2387 */ 2388 2389 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2390 args->rsize = data->rsize; 2391 args->wsize = data->wsize; 2392 args->timeo = data->timeo; 2393 args->retrans = data->retrans; 2394 args->acregmin = data->acregmin; 2395 args->acregmax = data->acregmax; 2396 args->acdirmin = data->acdirmin; 2397 args->acdirmax = data->acdirmax; 2398 args->nfs_server.protocol = data->proto; 2399 nfs_validate_transport_protocol(args); 2400 2401 break; 2402 default: { 2403 int status; 2404 2405 if (nfs_parse_mount_options((char *)options, args) == 0) 2406 return -EINVAL; 2407 2408 if (!nfs_verify_server_address((struct sockaddr *) 2409 &args->nfs_server.address)) 2410 return -EINVAL; 2411 2412 nfs_set_port((struct sockaddr *)&args->nfs_server.address, 2413 args->nfs_server.port); 2414 2415 nfs_validate_transport_protocol(args); 2416 2417 nfs4_validate_mount_flags(args); 2418 2419 if (args->auth_flavor_len > 1) 2420 goto out_inval_auth; 2421 2422 if (args->client_address == NULL) 2423 goto out_no_client_address; 2424 2425 status = nfs_parse_devname(dev_name, 2426 &args->nfs_server.hostname, 2427 NFS4_MAXNAMLEN, 2428 &args->nfs_server.export_path, 2429 NFS4_MAXPATHLEN); 2430 if (status < 0) 2431 return status; 2432 2433 break; 2434 } 2435 } 2436 2437 return 0; 2438 2439 out_no_data: 2440 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2441 return -EINVAL; 2442 2443 out_inval_auth: 2444 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2445 data->auth_flavourlen); 2446 return -EINVAL; 2447 2448 out_no_address: 2449 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2450 return -EINVAL; 2451 2452 out_no_client_address: 2453 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n"); 2454 return -EINVAL; 2455 } 2456 2457 /* 2458 * Get the superblock for the NFS4 root partition 2459 */ 2460 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2461 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2462 { 2463 struct nfs_parsed_mount_data *data = raw_data; 2464 struct super_block *s; 2465 struct nfs_server *server; 2466 struct nfs_fh *mntfh; 2467 struct dentry *mntroot; 2468 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2469 struct nfs_sb_mountdata sb_mntdata = { 2470 .mntflags = flags, 2471 }; 2472 int error = -ENOMEM; 2473 2474 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2475 if (data == NULL || mntfh == NULL) 2476 goto out_free_fh; 2477 2478 security_init_mnt_opts(&data->lsm_opts); 2479 2480 /* Get a volume representation */ 2481 server = nfs4_create_server(data, mntfh); 2482 if (IS_ERR(server)) { 2483 error = PTR_ERR(server); 2484 goto out; 2485 } 2486 sb_mntdata.server = server; 2487 2488 if (server->flags & NFS4_MOUNT_UNSHARED) 2489 compare_super = NULL; 2490 2491 /* Get a superblock - note that we may end up sharing one that already exists */ 2492 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2493 if (IS_ERR(s)) { 2494 error = PTR_ERR(s); 2495 goto out_free; 2496 } 2497 2498 if (s->s_fs_info != server) { 2499 nfs_free_server(server); 2500 server = NULL; 2501 } else { 2502 error = nfs_bdi_register(server); 2503 if (error) 2504 goto error_splat_super; 2505 } 2506 2507 if (!s->s_root) { 2508 /* initial superblock/root creation */ 2509 nfs4_fill_super(s); 2510 nfs_fscache_get_super_cookie(s, data); 2511 } 2512 2513 mntroot = nfs4_get_root(s, mntfh); 2514 if (IS_ERR(mntroot)) { 2515 error = PTR_ERR(mntroot); 2516 goto error_splat_super; 2517 } 2518 2519 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2520 if (error) 2521 goto error_splat_root; 2522 2523 s->s_flags |= MS_ACTIVE; 2524 mnt->mnt_sb = s; 2525 mnt->mnt_root = mntroot; 2526 error = 0; 2527 2528 out: 2529 security_free_mnt_opts(&data->lsm_opts); 2530 out_free_fh: 2531 kfree(mntfh); 2532 return error; 2533 2534 out_free: 2535 nfs_free_server(server); 2536 goto out; 2537 2538 error_splat_root: 2539 dput(mntroot); 2540 error_splat_super: 2541 deactivate_locked_super(s); 2542 goto out; 2543 } 2544 2545 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2546 int flags, void *data, const char *hostname) 2547 { 2548 struct vfsmount *root_mnt; 2549 char *root_devname; 2550 size_t len; 2551 2552 len = strlen(hostname) + 3; 2553 root_devname = kmalloc(len, GFP_KERNEL); 2554 if (root_devname == NULL) 2555 return ERR_PTR(-ENOMEM); 2556 snprintf(root_devname, len, "%s:/", hostname); 2557 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2558 kfree(root_devname); 2559 return root_mnt; 2560 } 2561 2562 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2563 { 2564 char *page = (char *) __get_free_page(GFP_KERNEL); 2565 char *devname, *tmp; 2566 2567 if (page == NULL) 2568 return; 2569 devname = nfs_path(path->mnt->mnt_devname, 2570 path->mnt->mnt_root, path->dentry, 2571 page, PAGE_SIZE); 2572 if (devname == NULL) 2573 goto out_freepage; 2574 tmp = kstrdup(devname, GFP_KERNEL); 2575 if (tmp == NULL) 2576 goto out_freepage; 2577 kfree(mnt->mnt_devname); 2578 mnt->mnt_devname = tmp; 2579 out_freepage: 2580 free_page((unsigned long)page); 2581 } 2582 2583 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2584 const char *export_path, struct vfsmount *mnt_target) 2585 { 2586 struct mnt_namespace *ns_private; 2587 struct nameidata nd; 2588 struct super_block *s; 2589 int ret; 2590 2591 ns_private = create_mnt_ns(root_mnt); 2592 ret = PTR_ERR(ns_private); 2593 if (IS_ERR(ns_private)) 2594 goto out_mntput; 2595 2596 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2597 export_path, LOOKUP_FOLLOW, &nd); 2598 2599 put_mnt_ns(ns_private); 2600 2601 if (ret != 0) 2602 goto out_err; 2603 2604 s = nd.path.mnt->mnt_sb; 2605 atomic_inc(&s->s_active); 2606 mnt_target->mnt_sb = s; 2607 mnt_target->mnt_root = dget(nd.path.dentry); 2608 2609 /* Correct the device pathname */ 2610 nfs_fix_devname(&nd.path, mnt_target); 2611 2612 path_put(&nd.path); 2613 down_write(&s->s_umount); 2614 return 0; 2615 out_mntput: 2616 mntput(root_mnt); 2617 out_err: 2618 return ret; 2619 } 2620 2621 /* 2622 * Get the superblock for an NFS4 mountpoint 2623 */ 2624 static int nfs4_get_sb(struct file_system_type *fs_type, 2625 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2626 { 2627 struct nfs_parsed_mount_data *data; 2628 char *export_path; 2629 struct vfsmount *root_mnt; 2630 int error = -ENOMEM; 2631 2632 data = kzalloc(sizeof(*data), GFP_KERNEL); 2633 if (data == NULL) 2634 goto out_free_data; 2635 2636 /* Validate the mount data */ 2637 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2638 if (error < 0) 2639 goto out; 2640 2641 export_path = data->nfs_server.export_path; 2642 data->nfs_server.export_path = "/"; 2643 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2644 data->nfs_server.hostname); 2645 data->nfs_server.export_path = export_path; 2646 2647 error = PTR_ERR(root_mnt); 2648 if (IS_ERR(root_mnt)) 2649 goto out; 2650 2651 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2652 2653 out: 2654 kfree(data->client_address); 2655 kfree(data->nfs_server.export_path); 2656 kfree(data->nfs_server.hostname); 2657 kfree(data->fscache_uniq); 2658 out_free_data: 2659 kfree(data); 2660 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2661 error != 0 ? " [error]" : ""); 2662 return error; 2663 } 2664 2665 static void nfs4_kill_super(struct super_block *sb) 2666 { 2667 struct nfs_server *server = NFS_SB(sb); 2668 2669 dprintk("--> %s\n", __func__); 2670 nfs_super_return_all_delegations(sb); 2671 kill_anon_super(sb); 2672 nfs4_renewd_prepare_shutdown(server); 2673 nfs_fscache_release_super_cookie(sb); 2674 nfs_free_server(server); 2675 dprintk("<-- %s\n", __func__); 2676 } 2677 2678 /* 2679 * Clone an NFS4 server record on xdev traversal (FSID-change) 2680 */ 2681 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2682 const char *dev_name, void *raw_data, 2683 struct vfsmount *mnt) 2684 { 2685 struct nfs_clone_mount *data = raw_data; 2686 struct super_block *s; 2687 struct nfs_server *server; 2688 struct dentry *mntroot; 2689 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2690 struct nfs_sb_mountdata sb_mntdata = { 2691 .mntflags = flags, 2692 }; 2693 int error; 2694 2695 dprintk("--> nfs4_xdev_get_sb()\n"); 2696 2697 /* create a new volume representation */ 2698 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2699 if (IS_ERR(server)) { 2700 error = PTR_ERR(server); 2701 goto out_err_noserver; 2702 } 2703 sb_mntdata.server = server; 2704 2705 if (server->flags & NFS4_MOUNT_UNSHARED) 2706 compare_super = NULL; 2707 2708 /* Get a superblock - note that we may end up sharing one that already exists */ 2709 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2710 if (IS_ERR(s)) { 2711 error = PTR_ERR(s); 2712 goto out_err_nosb; 2713 } 2714 2715 if (s->s_fs_info != server) { 2716 nfs_free_server(server); 2717 server = NULL; 2718 } else { 2719 error = nfs_bdi_register(server); 2720 if (error) 2721 goto error_splat_super; 2722 } 2723 2724 if (!s->s_root) { 2725 /* initial superblock/root creation */ 2726 nfs4_clone_super(s, data->sb); 2727 } 2728 2729 mntroot = nfs4_get_root(s, data->fh); 2730 if (IS_ERR(mntroot)) { 2731 error = PTR_ERR(mntroot); 2732 goto error_splat_super; 2733 } 2734 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2735 dput(mntroot); 2736 error = -ESTALE; 2737 goto error_splat_super; 2738 } 2739 2740 s->s_flags |= MS_ACTIVE; 2741 mnt->mnt_sb = s; 2742 mnt->mnt_root = mntroot; 2743 2744 security_sb_clone_mnt_opts(data->sb, s); 2745 2746 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 2747 return 0; 2748 2749 out_err_nosb: 2750 nfs_free_server(server); 2751 out_err_noserver: 2752 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2753 return error; 2754 2755 error_splat_super: 2756 deactivate_locked_super(s); 2757 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2758 return error; 2759 } 2760 2761 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2762 int flags, const char *dev_name, void *raw_data, 2763 struct vfsmount *mnt) 2764 { 2765 struct nfs_clone_mount *data = raw_data; 2766 struct super_block *s; 2767 struct nfs_server *server; 2768 struct dentry *mntroot; 2769 struct nfs_fh mntfh; 2770 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2771 struct nfs_sb_mountdata sb_mntdata = { 2772 .mntflags = flags, 2773 }; 2774 int error; 2775 2776 dprintk("--> nfs4_referral_get_sb()\n"); 2777 2778 /* create a new volume representation */ 2779 server = nfs4_create_referral_server(data, &mntfh); 2780 if (IS_ERR(server)) { 2781 error = PTR_ERR(server); 2782 goto out_err_noserver; 2783 } 2784 sb_mntdata.server = server; 2785 2786 if (server->flags & NFS4_MOUNT_UNSHARED) 2787 compare_super = NULL; 2788 2789 /* Get a superblock - note that we may end up sharing one that already exists */ 2790 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2791 if (IS_ERR(s)) { 2792 error = PTR_ERR(s); 2793 goto out_err_nosb; 2794 } 2795 2796 if (s->s_fs_info != server) { 2797 nfs_free_server(server); 2798 server = NULL; 2799 } else { 2800 error = nfs_bdi_register(server); 2801 if (error) 2802 goto error_splat_super; 2803 } 2804 2805 if (!s->s_root) { 2806 /* initial superblock/root creation */ 2807 nfs4_fill_super(s); 2808 } 2809 2810 mntroot = nfs4_get_root(s, &mntfh); 2811 if (IS_ERR(mntroot)) { 2812 error = PTR_ERR(mntroot); 2813 goto error_splat_super; 2814 } 2815 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2816 dput(mntroot); 2817 error = -ESTALE; 2818 goto error_splat_super; 2819 } 2820 2821 s->s_flags |= MS_ACTIVE; 2822 mnt->mnt_sb = s; 2823 mnt->mnt_root = mntroot; 2824 2825 security_sb_clone_mnt_opts(data->sb, s); 2826 2827 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2828 return 0; 2829 2830 out_err_nosb: 2831 nfs_free_server(server); 2832 out_err_noserver: 2833 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2834 return error; 2835 2836 error_splat_super: 2837 deactivate_locked_super(s); 2838 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2839 return error; 2840 } 2841 2842 /* 2843 * Create an NFS4 server record on referral traversal 2844 */ 2845 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 2846 int flags, const char *dev_name, void *raw_data, 2847 struct vfsmount *mnt) 2848 { 2849 struct nfs_clone_mount *data = raw_data; 2850 char *export_path; 2851 struct vfsmount *root_mnt; 2852 int error; 2853 2854 dprintk("--> nfs4_referral_get_sb()\n"); 2855 2856 export_path = data->mnt_path; 2857 data->mnt_path = "/"; 2858 2859 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2860 flags, data, data->hostname); 2861 data->mnt_path = export_path; 2862 2863 error = PTR_ERR(root_mnt); 2864 if (IS_ERR(root_mnt)) 2865 goto out; 2866 2867 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2868 out: 2869 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 2870 error != 0 ? " [error]" : ""); 2871 return error; 2872 } 2873 2874 #endif /* CONFIG_NFS_V4 */ 2875