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, Opt_v4, 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_v4, "v4" }, 131 { Opt_udp, "udp" }, 132 { Opt_tcp, "tcp" }, 133 { Opt_rdma, "rdma" }, 134 { Opt_acl, "acl" }, 135 { Opt_noacl, "noacl" }, 136 { Opt_rdirplus, "rdirplus" }, 137 { Opt_nordirplus, "nordirplus" }, 138 { Opt_sharecache, "sharecache" }, 139 { Opt_nosharecache, "nosharecache" }, 140 { Opt_resvport, "resvport" }, 141 { Opt_noresvport, "noresvport" }, 142 { Opt_fscache, "fsc" }, 143 { Opt_fscache_uniq, "fsc=%s" }, 144 { Opt_nofscache, "nofsc" }, 145 146 { Opt_port, "port=%s" }, 147 { Opt_rsize, "rsize=%s" }, 148 { Opt_wsize, "wsize=%s" }, 149 { Opt_bsize, "bsize=%s" }, 150 { Opt_timeo, "timeo=%s" }, 151 { Opt_retrans, "retrans=%s" }, 152 { Opt_acregmin, "acregmin=%s" }, 153 { Opt_acregmax, "acregmax=%s" }, 154 { Opt_acdirmin, "acdirmin=%s" }, 155 { Opt_acdirmax, "acdirmax=%s" }, 156 { Opt_actimeo, "actimeo=%s" }, 157 { Opt_namelen, "namlen=%s" }, 158 { Opt_mountport, "mountport=%s" }, 159 { Opt_mountvers, "mountvers=%s" }, 160 { Opt_nfsvers, "nfsvers=%s" }, 161 { Opt_nfsvers, "vers=%s" }, 162 { Opt_minorversion, "minorversion=%s" }, 163 164 { Opt_sec, "sec=%s" }, 165 { Opt_proto, "proto=%s" }, 166 { Opt_mountproto, "mountproto=%s" }, 167 { Opt_addr, "addr=%s" }, 168 { Opt_clientaddr, "clientaddr=%s" }, 169 { Opt_mounthost, "mounthost=%s" }, 170 { Opt_mountaddr, "mountaddr=%s" }, 171 172 { Opt_lookupcache, "lookupcache=%s" }, 173 174 { Opt_err, NULL } 175 }; 176 177 enum { 178 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 179 180 Opt_xprt_err 181 }; 182 183 static const match_table_t nfs_xprt_protocol_tokens = { 184 { Opt_xprt_udp, "udp" }, 185 { Opt_xprt_udp6, "udp6" }, 186 { Opt_xprt_tcp, "tcp" }, 187 { Opt_xprt_tcp6, "tcp6" }, 188 { Opt_xprt_rdma, "rdma" }, 189 190 { Opt_xprt_err, NULL } 191 }; 192 193 enum { 194 Opt_sec_none, Opt_sec_sys, 195 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 196 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 197 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 198 199 Opt_sec_err 200 }; 201 202 static const match_table_t nfs_secflavor_tokens = { 203 { Opt_sec_none, "none" }, 204 { Opt_sec_none, "null" }, 205 { Opt_sec_sys, "sys" }, 206 207 { Opt_sec_krb5, "krb5" }, 208 { Opt_sec_krb5i, "krb5i" }, 209 { Opt_sec_krb5p, "krb5p" }, 210 211 { Opt_sec_lkey, "lkey" }, 212 { Opt_sec_lkeyi, "lkeyi" }, 213 { Opt_sec_lkeyp, "lkeyp" }, 214 215 { Opt_sec_spkm, "spkm3" }, 216 { Opt_sec_spkmi, "spkm3i" }, 217 { Opt_sec_spkmp, "spkm3p" }, 218 219 { Opt_sec_err, NULL } 220 }; 221 222 enum { 223 Opt_lookupcache_all, Opt_lookupcache_positive, 224 Opt_lookupcache_none, 225 226 Opt_lookupcache_err 227 }; 228 229 static match_table_t nfs_lookupcache_tokens = { 230 { Opt_lookupcache_all, "all" }, 231 { Opt_lookupcache_positive, "pos" }, 232 { Opt_lookupcache_positive, "positive" }, 233 { Opt_lookupcache_none, "none" }, 234 235 { Opt_lookupcache_err, NULL } 236 }; 237 238 239 static void nfs_umount_begin(struct super_block *); 240 static int nfs_statfs(struct dentry *, struct kstatfs *); 241 static int nfs_show_options(struct seq_file *, struct vfsmount *); 242 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 243 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 244 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 246 static void nfs_kill_super(struct super_block *); 247 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 248 249 static struct file_system_type nfs_fs_type = { 250 .owner = THIS_MODULE, 251 .name = "nfs", 252 .get_sb = nfs_get_sb, 253 .kill_sb = nfs_kill_super, 254 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 255 }; 256 257 struct file_system_type nfs_xdev_fs_type = { 258 .owner = THIS_MODULE, 259 .name = "nfs", 260 .get_sb = nfs_xdev_get_sb, 261 .kill_sb = nfs_kill_super, 262 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 263 }; 264 265 static const struct super_operations nfs_sops = { 266 .alloc_inode = nfs_alloc_inode, 267 .destroy_inode = nfs_destroy_inode, 268 .write_inode = nfs_write_inode, 269 .statfs = nfs_statfs, 270 .clear_inode = nfs_clear_inode, 271 .umount_begin = nfs_umount_begin, 272 .show_options = nfs_show_options, 273 .show_stats = nfs_show_stats, 274 .remount_fs = nfs_remount, 275 }; 276 277 #ifdef CONFIG_NFS_V4 278 static int nfs4_validate_text_mount_data(void *options, 279 struct nfs_parsed_mount_data *args, const char *dev_name); 280 static int nfs4_try_mount(int flags, const char *dev_name, 281 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 282 static int nfs4_get_sb(struct file_system_type *fs_type, 283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 284 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 286 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 288 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 290 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 291 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 292 static void nfs4_kill_super(struct super_block *sb); 293 294 static struct file_system_type nfs4_fs_type = { 295 .owner = THIS_MODULE, 296 .name = "nfs4", 297 .get_sb = nfs4_get_sb, 298 .kill_sb = nfs4_kill_super, 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 300 }; 301 302 static struct file_system_type nfs4_remote_fs_type = { 303 .owner = THIS_MODULE, 304 .name = "nfs4", 305 .get_sb = nfs4_remote_get_sb, 306 .kill_sb = nfs4_kill_super, 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 308 }; 309 310 struct file_system_type nfs4_xdev_fs_type = { 311 .owner = THIS_MODULE, 312 .name = "nfs4", 313 .get_sb = nfs4_xdev_get_sb, 314 .kill_sb = nfs4_kill_super, 315 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 316 }; 317 318 static struct file_system_type nfs4_remote_referral_fs_type = { 319 .owner = THIS_MODULE, 320 .name = "nfs4", 321 .get_sb = nfs4_remote_referral_get_sb, 322 .kill_sb = nfs4_kill_super, 323 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 324 }; 325 326 struct file_system_type nfs4_referral_fs_type = { 327 .owner = THIS_MODULE, 328 .name = "nfs4", 329 .get_sb = nfs4_referral_get_sb, 330 .kill_sb = nfs4_kill_super, 331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 332 }; 333 334 static const struct super_operations nfs4_sops = { 335 .alloc_inode = nfs_alloc_inode, 336 .destroy_inode = nfs_destroy_inode, 337 .write_inode = nfs_write_inode, 338 .statfs = nfs_statfs, 339 .clear_inode = nfs4_clear_inode, 340 .umount_begin = nfs_umount_begin, 341 .show_options = nfs_show_options, 342 .show_stats = nfs_show_stats, 343 .remount_fs = nfs_remount, 344 }; 345 #endif 346 347 static struct shrinker acl_shrinker = { 348 .shrink = nfs_access_cache_shrinker, 349 .seeks = DEFAULT_SEEKS, 350 }; 351 352 /* 353 * Register the NFS filesystems 354 */ 355 int __init register_nfs_fs(void) 356 { 357 int ret; 358 359 ret = register_filesystem(&nfs_fs_type); 360 if (ret < 0) 361 goto error_0; 362 363 ret = nfs_register_sysctl(); 364 if (ret < 0) 365 goto error_1; 366 #ifdef CONFIG_NFS_V4 367 ret = register_filesystem(&nfs4_fs_type); 368 if (ret < 0) 369 goto error_2; 370 #endif 371 register_shrinker(&acl_shrinker); 372 return 0; 373 374 #ifdef CONFIG_NFS_V4 375 error_2: 376 nfs_unregister_sysctl(); 377 #endif 378 error_1: 379 unregister_filesystem(&nfs_fs_type); 380 error_0: 381 return ret; 382 } 383 384 /* 385 * Unregister the NFS filesystems 386 */ 387 void __exit unregister_nfs_fs(void) 388 { 389 unregister_shrinker(&acl_shrinker); 390 #ifdef CONFIG_NFS_V4 391 unregister_filesystem(&nfs4_fs_type); 392 #endif 393 nfs_unregister_sysctl(); 394 unregister_filesystem(&nfs_fs_type); 395 } 396 397 void nfs_sb_active(struct super_block *sb) 398 { 399 struct nfs_server *server = NFS_SB(sb); 400 401 if (atomic_inc_return(&server->active) == 1) 402 atomic_inc(&sb->s_active); 403 } 404 405 void nfs_sb_deactive(struct super_block *sb) 406 { 407 struct nfs_server *server = NFS_SB(sb); 408 409 if (atomic_dec_and_test(&server->active)) 410 deactivate_super(sb); 411 } 412 413 /* 414 * Deliver file system statistics to userspace 415 */ 416 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 417 { 418 struct nfs_server *server = NFS_SB(dentry->d_sb); 419 unsigned char blockbits; 420 unsigned long blockres; 421 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 422 struct nfs_fattr fattr; 423 struct nfs_fsstat res = { 424 .fattr = &fattr, 425 }; 426 int error; 427 428 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 429 if (error < 0) 430 goto out_err; 431 buf->f_type = NFS_SUPER_MAGIC; 432 433 /* 434 * Current versions of glibc do not correctly handle the 435 * case where f_frsize != f_bsize. Eventually we want to 436 * report the value of wtmult in this field. 437 */ 438 buf->f_frsize = dentry->d_sb->s_blocksize; 439 440 /* 441 * On most *nix systems, f_blocks, f_bfree, and f_bavail 442 * are reported in units of f_frsize. Linux hasn't had 443 * an f_frsize field in its statfs struct until recently, 444 * thus historically Linux's sys_statfs reports these 445 * fields in units of f_bsize. 446 */ 447 buf->f_bsize = dentry->d_sb->s_blocksize; 448 blockbits = dentry->d_sb->s_blocksize_bits; 449 blockres = (1 << blockbits) - 1; 450 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 451 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 452 buf->f_bavail = (res.abytes + blockres) >> blockbits; 453 454 buf->f_files = res.tfiles; 455 buf->f_ffree = res.afiles; 456 457 buf->f_namelen = server->namelen; 458 459 return 0; 460 461 out_err: 462 dprintk("%s: statfs error = %d\n", __func__, -error); 463 return error; 464 } 465 466 /* 467 * Map the security flavour number to a name 468 */ 469 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 470 { 471 static const struct { 472 rpc_authflavor_t flavour; 473 const char *str; 474 } sec_flavours[] = { 475 { RPC_AUTH_NULL, "null" }, 476 { RPC_AUTH_UNIX, "sys" }, 477 { RPC_AUTH_GSS_KRB5, "krb5" }, 478 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 479 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 480 { RPC_AUTH_GSS_LKEY, "lkey" }, 481 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 482 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 483 { RPC_AUTH_GSS_SPKM, "spkm" }, 484 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 485 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 486 { UINT_MAX, "unknown" } 487 }; 488 int i; 489 490 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 491 if (sec_flavours[i].flavour == flavour) 492 break; 493 } 494 return sec_flavours[i].str; 495 } 496 497 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 498 int showdefaults) 499 { 500 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 501 502 seq_printf(m, ",mountproto="); 503 switch (sap->sa_family) { 504 case AF_INET: 505 switch (nfss->mountd_protocol) { 506 case IPPROTO_UDP: 507 seq_printf(m, RPCBIND_NETID_UDP); 508 break; 509 case IPPROTO_TCP: 510 seq_printf(m, RPCBIND_NETID_TCP); 511 break; 512 default: 513 if (showdefaults) 514 seq_printf(m, "auto"); 515 } 516 break; 517 case AF_INET6: 518 switch (nfss->mountd_protocol) { 519 case IPPROTO_UDP: 520 seq_printf(m, RPCBIND_NETID_UDP6); 521 break; 522 case IPPROTO_TCP: 523 seq_printf(m, RPCBIND_NETID_TCP6); 524 break; 525 default: 526 if (showdefaults) 527 seq_printf(m, "auto"); 528 } 529 break; 530 default: 531 if (showdefaults) 532 seq_printf(m, "auto"); 533 } 534 } 535 536 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 537 int showdefaults) 538 { 539 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 540 541 switch (sap->sa_family) { 542 case AF_INET: { 543 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 544 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 545 break; 546 } 547 case AF_INET6: { 548 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 549 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 550 break; 551 } 552 default: 553 if (showdefaults) 554 seq_printf(m, ",mountaddr=unspecified"); 555 } 556 557 if (nfss->mountd_version || showdefaults) 558 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 559 if (nfss->mountd_port || showdefaults) 560 seq_printf(m, ",mountport=%u", nfss->mountd_port); 561 562 nfs_show_mountd_netid(m, nfss, showdefaults); 563 } 564 565 /* 566 * Describe the mount options in force on this server representation 567 */ 568 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 569 int showdefaults) 570 { 571 static const struct proc_nfs_info { 572 int flag; 573 const char *str; 574 const char *nostr; 575 } nfs_info[] = { 576 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 577 { NFS_MOUNT_POSIX, ",posix", "" }, 578 { NFS_MOUNT_NOCTO, ",nocto", "" }, 579 { NFS_MOUNT_NOAC, ",noac", "" }, 580 { NFS_MOUNT_NONLM, ",nolock", "" }, 581 { NFS_MOUNT_NOACL, ",noacl", "" }, 582 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 583 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 584 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 585 { 0, NULL, NULL } 586 }; 587 const struct proc_nfs_info *nfs_infop; 588 struct nfs_client *clp = nfss->nfs_client; 589 u32 version = clp->rpc_ops->version; 590 591 seq_printf(m, ",vers=%u", version); 592 seq_printf(m, ",rsize=%u", nfss->rsize); 593 seq_printf(m, ",wsize=%u", nfss->wsize); 594 if (nfss->bsize != 0) 595 seq_printf(m, ",bsize=%u", nfss->bsize); 596 seq_printf(m, ",namlen=%u", nfss->namelen); 597 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 598 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 599 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 600 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 601 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 602 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 603 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 604 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 605 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 606 if (nfss->flags & nfs_infop->flag) 607 seq_puts(m, nfs_infop->str); 608 else 609 seq_puts(m, nfs_infop->nostr); 610 } 611 seq_printf(m, ",proto=%s", 612 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 613 if (version == 4) { 614 if (nfss->port != NFS_PORT) 615 seq_printf(m, ",port=%u", nfss->port); 616 } else 617 if (nfss->port) 618 seq_printf(m, ",port=%u", nfss->port); 619 620 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 621 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 622 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 623 624 if (version != 4) 625 nfs_show_mountd_options(m, nfss, showdefaults); 626 627 #ifdef CONFIG_NFS_V4 628 if (clp->rpc_ops->version == 4) 629 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 630 #endif 631 if (nfss->options & NFS_OPTION_FSCACHE) 632 seq_printf(m, ",fsc"); 633 } 634 635 /* 636 * Describe the mount options on this VFS mountpoint 637 */ 638 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 639 { 640 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 641 642 nfs_show_mount_options(m, nfss, 0); 643 644 seq_printf(m, ",addr=%s", 645 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 646 RPC_DISPLAY_ADDR)); 647 648 return 0; 649 } 650 651 /* 652 * Present statistical information for this VFS mountpoint 653 */ 654 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 655 { 656 int i, cpu; 657 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 658 struct rpc_auth *auth = nfss->client->cl_auth; 659 struct nfs_iostats totals = { }; 660 661 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 662 663 /* 664 * Display all mount option settings 665 */ 666 seq_printf(m, "\n\topts:\t"); 667 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 668 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 669 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 670 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 671 nfs_show_mount_options(m, nfss, 1); 672 673 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 674 675 seq_printf(m, "\n\tcaps:\t"); 676 seq_printf(m, "caps=0x%x", nfss->caps); 677 seq_printf(m, ",wtmult=%u", nfss->wtmult); 678 seq_printf(m, ",dtsize=%u", nfss->dtsize); 679 seq_printf(m, ",bsize=%u", nfss->bsize); 680 seq_printf(m, ",namlen=%u", nfss->namelen); 681 682 #ifdef CONFIG_NFS_V4 683 if (nfss->nfs_client->rpc_ops->version == 4) { 684 seq_printf(m, "\n\tnfsv4:\t"); 685 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 686 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 687 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 688 } 689 #endif 690 691 /* 692 * Display security flavor in effect for this mount 693 */ 694 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 695 if (auth->au_flavor) 696 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 697 698 /* 699 * Display superblock I/O counters 700 */ 701 for_each_possible_cpu(cpu) { 702 struct nfs_iostats *stats; 703 704 preempt_disable(); 705 stats = per_cpu_ptr(nfss->io_stats, cpu); 706 707 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 708 totals.events[i] += stats->events[i]; 709 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 710 totals.bytes[i] += stats->bytes[i]; 711 #ifdef CONFIG_NFS_FSCACHE 712 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 713 totals.fscache[i] += stats->fscache[i]; 714 #endif 715 716 preempt_enable(); 717 } 718 719 seq_printf(m, "\n\tevents:\t"); 720 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 721 seq_printf(m, "%lu ", totals.events[i]); 722 seq_printf(m, "\n\tbytes:\t"); 723 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 724 seq_printf(m, "%Lu ", totals.bytes[i]); 725 #ifdef CONFIG_NFS_FSCACHE 726 if (nfss->options & NFS_OPTION_FSCACHE) { 727 seq_printf(m, "\n\tfsc:\t"); 728 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 729 seq_printf(m, "%Lu ", totals.bytes[i]); 730 } 731 #endif 732 seq_printf(m, "\n"); 733 734 rpc_print_iostats(m, nfss->client); 735 736 return 0; 737 } 738 739 /* 740 * Begin unmount by attempting to remove all automounted mountpoints we added 741 * in response to xdev traversals and referrals 742 */ 743 static void nfs_umount_begin(struct super_block *sb) 744 { 745 struct nfs_server *server; 746 struct rpc_clnt *rpc; 747 748 server = NFS_SB(sb); 749 /* -EIO all pending I/O */ 750 rpc = server->client_acl; 751 if (!IS_ERR(rpc)) 752 rpc_killall_tasks(rpc); 753 rpc = server->client; 754 if (!IS_ERR(rpc)) 755 rpc_killall_tasks(rpc); 756 } 757 758 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 759 { 760 struct nfs_parsed_mount_data *data; 761 762 data = kzalloc(sizeof(*data), GFP_KERNEL); 763 if (data) { 764 data->acregmin = NFS_DEF_ACREGMIN; 765 data->acregmax = NFS_DEF_ACREGMAX; 766 data->acdirmin = NFS_DEF_ACDIRMIN; 767 data->acdirmax = NFS_DEF_ACDIRMAX; 768 data->mount_server.port = NFS_UNSPEC_PORT; 769 data->nfs_server.port = NFS_UNSPEC_PORT; 770 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 771 data->auth_flavors[0] = RPC_AUTH_UNIX; 772 data->auth_flavor_len = 1; 773 data->version = version; 774 data->minorversion = 0; 775 } 776 return data; 777 } 778 779 /* 780 * Sanity-check a server address provided by the mount command. 781 * 782 * Address family must be initialized, and address must not be 783 * the ANY address for that family. 784 */ 785 static int nfs_verify_server_address(struct sockaddr *addr) 786 { 787 switch (addr->sa_family) { 788 case AF_INET: { 789 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 790 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 791 } 792 case AF_INET6: { 793 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 794 return !ipv6_addr_any(sa); 795 } 796 } 797 798 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 799 return 0; 800 } 801 802 /* 803 * Select between a default port value and a user-specified port value. 804 * If a zero value is set, then autobind will be used. 805 */ 806 static void nfs_set_port(struct sockaddr *sap, int *port, 807 const unsigned short default_port) 808 { 809 if (*port == NFS_UNSPEC_PORT) 810 *port = default_port; 811 812 rpc_set_port(sap, *port); 813 } 814 815 /* 816 * Sanity check the NFS transport protocol. 817 * 818 */ 819 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 820 { 821 switch (mnt->nfs_server.protocol) { 822 case XPRT_TRANSPORT_UDP: 823 case XPRT_TRANSPORT_TCP: 824 case XPRT_TRANSPORT_RDMA: 825 break; 826 default: 827 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 828 } 829 } 830 831 /* 832 * For text based NFSv2/v3 mounts, the mount protocol transport default 833 * settings should depend upon the specified NFS transport. 834 */ 835 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 836 { 837 nfs_validate_transport_protocol(mnt); 838 839 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 840 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 841 return; 842 switch (mnt->nfs_server.protocol) { 843 case XPRT_TRANSPORT_UDP: 844 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 845 break; 846 case XPRT_TRANSPORT_TCP: 847 case XPRT_TRANSPORT_RDMA: 848 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 849 } 850 } 851 852 /* 853 * Parse the value of the 'sec=' option. 854 */ 855 static int nfs_parse_security_flavors(char *value, 856 struct nfs_parsed_mount_data *mnt) 857 { 858 substring_t args[MAX_OPT_ARGS]; 859 860 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 861 862 switch (match_token(value, nfs_secflavor_tokens, args)) { 863 case Opt_sec_none: 864 mnt->auth_flavors[0] = RPC_AUTH_NULL; 865 break; 866 case Opt_sec_sys: 867 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 868 break; 869 case Opt_sec_krb5: 870 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 871 break; 872 case Opt_sec_krb5i: 873 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 874 break; 875 case Opt_sec_krb5p: 876 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 877 break; 878 case Opt_sec_lkey: 879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 880 break; 881 case Opt_sec_lkeyi: 882 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 883 break; 884 case Opt_sec_lkeyp: 885 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 886 break; 887 case Opt_sec_spkm: 888 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 889 break; 890 case Opt_sec_spkmi: 891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 892 break; 893 case Opt_sec_spkmp: 894 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 895 break; 896 default: 897 return 0; 898 } 899 900 mnt->auth_flavor_len = 1; 901 return 1; 902 } 903 904 /* 905 * Error-check and convert a string of mount options from user space into 906 * a data structure. The whole mount string is processed; bad options are 907 * skipped as they are encountered. If there were no errors, return 1; 908 * otherwise return 0 (zero). 909 */ 910 static int nfs_parse_mount_options(char *raw, 911 struct nfs_parsed_mount_data *mnt) 912 { 913 char *p, *string, *secdata; 914 int rc, sloppy = 0, invalid_option = 0; 915 unsigned short protofamily = AF_UNSPEC; 916 unsigned short mountfamily = AF_UNSPEC; 917 918 if (!raw) { 919 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 920 return 1; 921 } 922 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 923 924 secdata = alloc_secdata(); 925 if (!secdata) 926 goto out_nomem; 927 928 rc = security_sb_copy_data(raw, secdata); 929 if (rc) 930 goto out_security_failure; 931 932 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 933 if (rc) 934 goto out_security_failure; 935 936 free_secdata(secdata); 937 938 while ((p = strsep(&raw, ",")) != NULL) { 939 substring_t args[MAX_OPT_ARGS]; 940 unsigned long option; 941 int token; 942 943 if (!*p) 944 continue; 945 946 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 947 948 token = match_token(p, nfs_mount_option_tokens, args); 949 switch (token) { 950 951 /* 952 * boolean options: foo/nofoo 953 */ 954 case Opt_soft: 955 mnt->flags |= NFS_MOUNT_SOFT; 956 break; 957 case Opt_hard: 958 mnt->flags &= ~NFS_MOUNT_SOFT; 959 break; 960 case Opt_posix: 961 mnt->flags |= NFS_MOUNT_POSIX; 962 break; 963 case Opt_noposix: 964 mnt->flags &= ~NFS_MOUNT_POSIX; 965 break; 966 case Opt_cto: 967 mnt->flags &= ~NFS_MOUNT_NOCTO; 968 break; 969 case Opt_nocto: 970 mnt->flags |= NFS_MOUNT_NOCTO; 971 break; 972 case Opt_ac: 973 mnt->flags &= ~NFS_MOUNT_NOAC; 974 break; 975 case Opt_noac: 976 mnt->flags |= NFS_MOUNT_NOAC; 977 break; 978 case Opt_lock: 979 mnt->flags &= ~NFS_MOUNT_NONLM; 980 break; 981 case Opt_nolock: 982 mnt->flags |= NFS_MOUNT_NONLM; 983 break; 984 case Opt_v2: 985 mnt->flags &= ~NFS_MOUNT_VER3; 986 mnt->version = 2; 987 break; 988 case Opt_v3: 989 mnt->flags |= NFS_MOUNT_VER3; 990 mnt->version = 3; 991 break; 992 #ifdef CONFIG_NFS_V4 993 case Opt_v4: 994 mnt->flags &= ~NFS_MOUNT_VER3; 995 mnt->version = 4; 996 break; 997 #endif 998 case Opt_udp: 999 mnt->flags &= ~NFS_MOUNT_TCP; 1000 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1001 break; 1002 case Opt_tcp: 1003 mnt->flags |= NFS_MOUNT_TCP; 1004 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1005 break; 1006 case Opt_rdma: 1007 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1009 xprt_load_transport(p); 1010 break; 1011 case Opt_acl: 1012 mnt->flags &= ~NFS_MOUNT_NOACL; 1013 break; 1014 case Opt_noacl: 1015 mnt->flags |= NFS_MOUNT_NOACL; 1016 break; 1017 case Opt_rdirplus: 1018 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1019 break; 1020 case Opt_nordirplus: 1021 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1022 break; 1023 case Opt_sharecache: 1024 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1025 break; 1026 case Opt_nosharecache: 1027 mnt->flags |= NFS_MOUNT_UNSHARED; 1028 break; 1029 case Opt_resvport: 1030 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1031 break; 1032 case Opt_noresvport: 1033 mnt->flags |= NFS_MOUNT_NORESVPORT; 1034 break; 1035 case Opt_fscache: 1036 mnt->options |= NFS_OPTION_FSCACHE; 1037 kfree(mnt->fscache_uniq); 1038 mnt->fscache_uniq = NULL; 1039 break; 1040 case Opt_nofscache: 1041 mnt->options &= ~NFS_OPTION_FSCACHE; 1042 kfree(mnt->fscache_uniq); 1043 mnt->fscache_uniq = NULL; 1044 break; 1045 case Opt_fscache_uniq: 1046 string = match_strdup(args); 1047 if (!string) 1048 goto out_nomem; 1049 kfree(mnt->fscache_uniq); 1050 mnt->fscache_uniq = string; 1051 mnt->options |= NFS_OPTION_FSCACHE; 1052 break; 1053 1054 /* 1055 * options that take numeric values 1056 */ 1057 case Opt_port: 1058 string = match_strdup(args); 1059 if (string == NULL) 1060 goto out_nomem; 1061 rc = strict_strtoul(string, 10, &option); 1062 kfree(string); 1063 if (rc != 0 || option > USHORT_MAX) 1064 goto out_invalid_value; 1065 mnt->nfs_server.port = option; 1066 break; 1067 case Opt_rsize: 1068 string = match_strdup(args); 1069 if (string == NULL) 1070 goto out_nomem; 1071 rc = strict_strtoul(string, 10, &option); 1072 kfree(string); 1073 if (rc != 0) 1074 goto out_invalid_value; 1075 mnt->rsize = option; 1076 break; 1077 case Opt_wsize: 1078 string = match_strdup(args); 1079 if (string == NULL) 1080 goto out_nomem; 1081 rc = strict_strtoul(string, 10, &option); 1082 kfree(string); 1083 if (rc != 0) 1084 goto out_invalid_value; 1085 mnt->wsize = option; 1086 break; 1087 case Opt_bsize: 1088 string = match_strdup(args); 1089 if (string == NULL) 1090 goto out_nomem; 1091 rc = strict_strtoul(string, 10, &option); 1092 kfree(string); 1093 if (rc != 0) 1094 goto out_invalid_value; 1095 mnt->bsize = option; 1096 break; 1097 case Opt_timeo: 1098 string = match_strdup(args); 1099 if (string == NULL) 1100 goto out_nomem; 1101 rc = strict_strtoul(string, 10, &option); 1102 kfree(string); 1103 if (rc != 0 || option == 0) 1104 goto out_invalid_value; 1105 mnt->timeo = option; 1106 break; 1107 case Opt_retrans: 1108 string = match_strdup(args); 1109 if (string == NULL) 1110 goto out_nomem; 1111 rc = strict_strtoul(string, 10, &option); 1112 kfree(string); 1113 if (rc != 0 || option == 0) 1114 goto out_invalid_value; 1115 mnt->retrans = option; 1116 break; 1117 case Opt_acregmin: 1118 string = match_strdup(args); 1119 if (string == NULL) 1120 goto out_nomem; 1121 rc = strict_strtoul(string, 10, &option); 1122 kfree(string); 1123 if (rc != 0) 1124 goto out_invalid_value; 1125 mnt->acregmin = option; 1126 break; 1127 case Opt_acregmax: 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) 1134 goto out_invalid_value; 1135 mnt->acregmax = option; 1136 break; 1137 case Opt_acdirmin: 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->acdirmin = option; 1146 break; 1147 case Opt_acdirmax: 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->acdirmax = option; 1156 break; 1157 case Opt_actimeo: 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->acregmin = mnt->acregmax = 1166 mnt->acdirmin = mnt->acdirmax = option; 1167 break; 1168 case Opt_namelen: 1169 string = match_strdup(args); 1170 if (string == NULL) 1171 goto out_nomem; 1172 rc = strict_strtoul(string, 10, &option); 1173 kfree(string); 1174 if (rc != 0) 1175 goto out_invalid_value; 1176 mnt->namlen = option; 1177 break; 1178 case Opt_mountport: 1179 string = match_strdup(args); 1180 if (string == NULL) 1181 goto out_nomem; 1182 rc = strict_strtoul(string, 10, &option); 1183 kfree(string); 1184 if (rc != 0 || option > USHORT_MAX) 1185 goto out_invalid_value; 1186 mnt->mount_server.port = option; 1187 break; 1188 case Opt_mountvers: 1189 string = match_strdup(args); 1190 if (string == NULL) 1191 goto out_nomem; 1192 rc = strict_strtoul(string, 10, &option); 1193 kfree(string); 1194 if (rc != 0 || 1195 option < NFS_MNT_VERSION || 1196 option > NFS_MNT3_VERSION) 1197 goto out_invalid_value; 1198 mnt->mount_server.version = option; 1199 break; 1200 case Opt_nfsvers: 1201 string = match_strdup(args); 1202 if (string == NULL) 1203 goto out_nomem; 1204 rc = strict_strtoul(string, 10, &option); 1205 kfree(string); 1206 if (rc != 0) 1207 goto out_invalid_value; 1208 switch (option) { 1209 case NFS2_VERSION: 1210 mnt->flags &= ~NFS_MOUNT_VER3; 1211 mnt->version = 2; 1212 break; 1213 case NFS3_VERSION: 1214 mnt->flags |= NFS_MOUNT_VER3; 1215 mnt->version = 3; 1216 break; 1217 #ifdef CONFIG_NFS_V4 1218 case NFS4_VERSION: 1219 mnt->flags &= ~NFS_MOUNT_VER3; 1220 mnt->version = 4; 1221 break; 1222 #endif 1223 default: 1224 goto out_invalid_value; 1225 } 1226 break; 1227 case Opt_minorversion: 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 if (option > NFS4_MAX_MINOR_VERSION) 1236 goto out_invalid_value; 1237 mnt->minorversion = option; 1238 break; 1239 1240 /* 1241 * options that take text values 1242 */ 1243 case Opt_sec: 1244 string = match_strdup(args); 1245 if (string == NULL) 1246 goto out_nomem; 1247 rc = nfs_parse_security_flavors(string, mnt); 1248 kfree(string); 1249 if (!rc) { 1250 dfprintk(MOUNT, "NFS: unrecognized " 1251 "security flavor\n"); 1252 return 0; 1253 } 1254 break; 1255 case Opt_proto: 1256 string = match_strdup(args); 1257 if (string == NULL) 1258 goto out_nomem; 1259 token = match_token(string, 1260 nfs_xprt_protocol_tokens, args); 1261 1262 protofamily = AF_INET; 1263 switch (token) { 1264 case Opt_xprt_udp6: 1265 protofamily = AF_INET6; 1266 case Opt_xprt_udp: 1267 mnt->flags &= ~NFS_MOUNT_TCP; 1268 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1269 kfree(string); 1270 break; 1271 case Opt_xprt_tcp6: 1272 protofamily = AF_INET6; 1273 case Opt_xprt_tcp: 1274 mnt->flags |= NFS_MOUNT_TCP; 1275 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1276 kfree(string); 1277 break; 1278 case Opt_xprt_rdma: 1279 /* vector side protocols to TCP */ 1280 mnt->flags |= NFS_MOUNT_TCP; 1281 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1282 xprt_load_transport(string); 1283 kfree(string); 1284 break; 1285 default: 1286 dfprintk(MOUNT, "NFS: unrecognized " 1287 "transport protocol\n"); 1288 kfree(string); 1289 return 0; 1290 } 1291 break; 1292 case Opt_mountproto: 1293 string = match_strdup(args); 1294 if (string == NULL) 1295 goto out_nomem; 1296 token = match_token(string, 1297 nfs_xprt_protocol_tokens, args); 1298 kfree(string); 1299 1300 mountfamily = AF_INET; 1301 switch (token) { 1302 case Opt_xprt_udp6: 1303 mountfamily = AF_INET6; 1304 case Opt_xprt_udp: 1305 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1306 break; 1307 case Opt_xprt_tcp6: 1308 mountfamily = AF_INET6; 1309 case Opt_xprt_tcp: 1310 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1311 break; 1312 case Opt_xprt_rdma: /* not used for side protocols */ 1313 default: 1314 dfprintk(MOUNT, "NFS: unrecognized " 1315 "transport protocol\n"); 1316 return 0; 1317 } 1318 break; 1319 case Opt_addr: 1320 string = match_strdup(args); 1321 if (string == NULL) 1322 goto out_nomem; 1323 mnt->nfs_server.addrlen = 1324 rpc_pton(string, strlen(string), 1325 (struct sockaddr *) 1326 &mnt->nfs_server.address, 1327 sizeof(mnt->nfs_server.address)); 1328 kfree(string); 1329 if (mnt->nfs_server.addrlen == 0) 1330 goto out_invalid_address; 1331 break; 1332 case Opt_clientaddr: 1333 string = match_strdup(args); 1334 if (string == NULL) 1335 goto out_nomem; 1336 kfree(mnt->client_address); 1337 mnt->client_address = string; 1338 break; 1339 case Opt_mounthost: 1340 string = match_strdup(args); 1341 if (string == NULL) 1342 goto out_nomem; 1343 kfree(mnt->mount_server.hostname); 1344 mnt->mount_server.hostname = string; 1345 break; 1346 case Opt_mountaddr: 1347 string = match_strdup(args); 1348 if (string == NULL) 1349 goto out_nomem; 1350 mnt->mount_server.addrlen = 1351 rpc_pton(string, strlen(string), 1352 (struct sockaddr *) 1353 &mnt->mount_server.address, 1354 sizeof(mnt->mount_server.address)); 1355 kfree(string); 1356 if (mnt->mount_server.addrlen == 0) 1357 goto out_invalid_address; 1358 break; 1359 case Opt_lookupcache: 1360 string = match_strdup(args); 1361 if (string == NULL) 1362 goto out_nomem; 1363 token = match_token(string, 1364 nfs_lookupcache_tokens, args); 1365 kfree(string); 1366 switch (token) { 1367 case Opt_lookupcache_all: 1368 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1369 break; 1370 case Opt_lookupcache_positive: 1371 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1372 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1373 break; 1374 case Opt_lookupcache_none: 1375 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1376 break; 1377 default: 1378 dfprintk(MOUNT, "NFS: invalid " 1379 "lookupcache argument\n"); 1380 return 0; 1381 }; 1382 break; 1383 1384 /* 1385 * Special options 1386 */ 1387 case Opt_sloppy: 1388 sloppy = 1; 1389 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1390 break; 1391 case Opt_userspace: 1392 case Opt_deprecated: 1393 dfprintk(MOUNT, "NFS: ignoring mount option " 1394 "'%s'\n", p); 1395 break; 1396 1397 default: 1398 invalid_option = 1; 1399 dfprintk(MOUNT, "NFS: unrecognized mount option " 1400 "'%s'\n", p); 1401 } 1402 } 1403 1404 if (!sloppy && invalid_option) 1405 return 0; 1406 1407 /* 1408 * verify that any proto=/mountproto= options match the address 1409 * familiies in the addr=/mountaddr= options. 1410 */ 1411 if (protofamily != AF_UNSPEC && 1412 protofamily != mnt->nfs_server.address.ss_family) 1413 goto out_proto_mismatch; 1414 1415 if (mountfamily != AF_UNSPEC) { 1416 if (mnt->mount_server.addrlen) { 1417 if (mountfamily != mnt->mount_server.address.ss_family) 1418 goto out_mountproto_mismatch; 1419 } else { 1420 if (mountfamily != mnt->nfs_server.address.ss_family) 1421 goto out_mountproto_mismatch; 1422 } 1423 } 1424 1425 return 1; 1426 1427 out_mountproto_mismatch: 1428 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1429 "option\n"); 1430 return 0; 1431 out_proto_mismatch: 1432 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1433 return 0; 1434 out_invalid_address: 1435 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1436 return 0; 1437 out_invalid_value: 1438 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1439 return 0; 1440 out_nomem: 1441 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1442 return 0; 1443 out_security_failure: 1444 free_secdata(secdata); 1445 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1446 return 0; 1447 } 1448 1449 /* 1450 * Match the requested auth flavors with the list returned by 1451 * the server. Returns zero and sets the mount's authentication 1452 * flavor on success; returns -EACCES if server does not support 1453 * the requested flavor. 1454 */ 1455 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1456 struct nfs_mount_request *request) 1457 { 1458 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1459 1460 /* 1461 * Certain releases of Linux's mountd return an empty 1462 * flavor list. To prevent behavioral regression with 1463 * these servers (ie. rejecting mounts that used to 1464 * succeed), revert to pre-2.6.32 behavior (no checking) 1465 * if the returned flavor list is empty. 1466 */ 1467 if (server_authlist_len == 0) 1468 return 0; 1469 1470 /* 1471 * We avoid sophisticated negotiating here, as there are 1472 * plenty of cases where we can get it wrong, providing 1473 * either too little or too much security. 1474 * 1475 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1476 * flavor listed first. However, some servers list 1477 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1478 * preferred default, in args->auth_flavors[0] if user 1479 * didn't specify sec= mount option. 1480 */ 1481 for (i = 0; i < args->auth_flavor_len; i++) 1482 for (j = 0; j < server_authlist_len; j++) 1483 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1484 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1485 request->auth_flavs[j]); 1486 args->auth_flavors[0] = request->auth_flavs[j]; 1487 return 0; 1488 } 1489 1490 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1491 nfs_umount(request); 1492 return -EACCES; 1493 } 1494 1495 /* 1496 * Use the remote server's MOUNT service to request the NFS file handle 1497 * corresponding to the provided path. 1498 */ 1499 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1500 struct nfs_fh *root_fh) 1501 { 1502 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1503 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1504 struct nfs_mount_request request = { 1505 .sap = (struct sockaddr *) 1506 &args->mount_server.address, 1507 .dirpath = args->nfs_server.export_path, 1508 .protocol = args->mount_server.protocol, 1509 .fh = root_fh, 1510 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1511 .auth_flav_len = &server_authlist_len, 1512 .auth_flavs = server_authlist, 1513 }; 1514 int status; 1515 1516 if (args->mount_server.version == 0) { 1517 switch (args->version) { 1518 default: 1519 args->mount_server.version = NFS_MNT3_VERSION; 1520 break; 1521 case 2: 1522 args->mount_server.version = NFS_MNT_VERSION; 1523 } 1524 } 1525 request.version = args->mount_server.version; 1526 1527 if (args->mount_server.hostname) 1528 request.hostname = args->mount_server.hostname; 1529 else 1530 request.hostname = args->nfs_server.hostname; 1531 1532 /* 1533 * Construct the mount server's address. 1534 */ 1535 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1536 memcpy(request.sap, &args->nfs_server.address, 1537 args->nfs_server.addrlen); 1538 args->mount_server.addrlen = args->nfs_server.addrlen; 1539 } 1540 request.salen = args->mount_server.addrlen; 1541 nfs_set_port(request.sap, &args->mount_server.port, 0); 1542 1543 /* 1544 * Now ask the mount server to map our export path 1545 * to a file handle. 1546 */ 1547 status = nfs_mount(&request); 1548 if (status != 0) { 1549 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1550 request.hostname, status); 1551 return status; 1552 } 1553 1554 /* 1555 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1556 */ 1557 if (args->mount_server.version != NFS_MNT3_VERSION) 1558 return 0; 1559 return nfs_walk_authlist(args, &request); 1560 } 1561 1562 static int nfs_parse_simple_hostname(const char *dev_name, 1563 char **hostname, size_t maxnamlen, 1564 char **export_path, size_t maxpathlen) 1565 { 1566 size_t len; 1567 char *colon, *comma; 1568 1569 colon = strchr(dev_name, ':'); 1570 if (colon == NULL) 1571 goto out_bad_devname; 1572 1573 len = colon - dev_name; 1574 if (len > maxnamlen) 1575 goto out_hostname; 1576 1577 /* N.B. caller will free nfs_server.hostname in all cases */ 1578 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1579 if (!*hostname) 1580 goto out_nomem; 1581 1582 /* kill possible hostname list: not supported */ 1583 comma = strchr(*hostname, ','); 1584 if (comma != NULL) { 1585 if (comma == *hostname) 1586 goto out_bad_devname; 1587 *comma = '\0'; 1588 } 1589 1590 colon++; 1591 len = strlen(colon); 1592 if (len > maxpathlen) 1593 goto out_path; 1594 *export_path = kstrndup(colon, len, GFP_KERNEL); 1595 if (!*export_path) 1596 goto out_nomem; 1597 1598 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1599 return 0; 1600 1601 out_bad_devname: 1602 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1603 return -EINVAL; 1604 1605 out_nomem: 1606 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1607 return -ENOMEM; 1608 1609 out_hostname: 1610 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1611 return -ENAMETOOLONG; 1612 1613 out_path: 1614 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1615 return -ENAMETOOLONG; 1616 } 1617 1618 /* 1619 * Hostname has square brackets around it because it contains one or 1620 * more colons. We look for the first closing square bracket, and a 1621 * colon must follow it. 1622 */ 1623 static int nfs_parse_protected_hostname(const char *dev_name, 1624 char **hostname, size_t maxnamlen, 1625 char **export_path, size_t maxpathlen) 1626 { 1627 size_t len; 1628 char *start, *end; 1629 1630 start = (char *)(dev_name + 1); 1631 1632 end = strchr(start, ']'); 1633 if (end == NULL) 1634 goto out_bad_devname; 1635 if (*(end + 1) != ':') 1636 goto out_bad_devname; 1637 1638 len = end - start; 1639 if (len > maxnamlen) 1640 goto out_hostname; 1641 1642 /* N.B. caller will free nfs_server.hostname in all cases */ 1643 *hostname = kstrndup(start, len, GFP_KERNEL); 1644 if (*hostname == NULL) 1645 goto out_nomem; 1646 1647 end += 2; 1648 len = strlen(end); 1649 if (len > maxpathlen) 1650 goto out_path; 1651 *export_path = kstrndup(end, len, GFP_KERNEL); 1652 if (!*export_path) 1653 goto out_nomem; 1654 1655 return 0; 1656 1657 out_bad_devname: 1658 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1659 return -EINVAL; 1660 1661 out_nomem: 1662 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1663 return -ENOMEM; 1664 1665 out_hostname: 1666 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1667 return -ENAMETOOLONG; 1668 1669 out_path: 1670 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1671 return -ENAMETOOLONG; 1672 } 1673 1674 /* 1675 * Split "dev_name" into "hostname:export_path". 1676 * 1677 * The leftmost colon demarks the split between the server's hostname 1678 * and the export path. If the hostname starts with a left square 1679 * bracket, then it may contain colons. 1680 * 1681 * Note: caller frees hostname and export path, even on error. 1682 */ 1683 static int nfs_parse_devname(const char *dev_name, 1684 char **hostname, size_t maxnamlen, 1685 char **export_path, size_t maxpathlen) 1686 { 1687 if (*dev_name == '[') 1688 return nfs_parse_protected_hostname(dev_name, 1689 hostname, maxnamlen, 1690 export_path, maxpathlen); 1691 1692 return nfs_parse_simple_hostname(dev_name, 1693 hostname, maxnamlen, 1694 export_path, maxpathlen); 1695 } 1696 1697 /* 1698 * Validate the NFS2/NFS3 mount data 1699 * - fills in the mount root filehandle 1700 * 1701 * For option strings, user space handles the following behaviors: 1702 * 1703 * + DNS: mapping server host name to IP address ("addr=" option) 1704 * 1705 * + failure mode: how to behave if a mount request can't be handled 1706 * immediately ("fg/bg" option) 1707 * 1708 * + retry: how often to retry a mount request ("retry=" option) 1709 * 1710 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1711 * mountproto=tcp after mountproto=udp, and so on 1712 */ 1713 static int nfs_validate_mount_data(void *options, 1714 struct nfs_parsed_mount_data *args, 1715 struct nfs_fh *mntfh, 1716 const char *dev_name) 1717 { 1718 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1719 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1720 1721 if (data == NULL) 1722 goto out_no_data; 1723 1724 switch (data->version) { 1725 case 1: 1726 data->namlen = 0; 1727 case 2: 1728 data->bsize = 0; 1729 case 3: 1730 if (data->flags & NFS_MOUNT_VER3) 1731 goto out_no_v3; 1732 data->root.size = NFS2_FHSIZE; 1733 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1734 case 4: 1735 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1736 goto out_no_sec; 1737 case 5: 1738 memset(data->context, 0, sizeof(data->context)); 1739 case 6: 1740 if (data->flags & NFS_MOUNT_VER3) { 1741 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1742 goto out_invalid_fh; 1743 mntfh->size = data->root.size; 1744 args->version = 3; 1745 } else { 1746 mntfh->size = NFS2_FHSIZE; 1747 args->version = 2; 1748 } 1749 1750 1751 memcpy(mntfh->data, data->root.data, mntfh->size); 1752 if (mntfh->size < sizeof(mntfh->data)) 1753 memset(mntfh->data + mntfh->size, 0, 1754 sizeof(mntfh->data) - mntfh->size); 1755 1756 /* 1757 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1758 * can deal with. 1759 */ 1760 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1761 args->rsize = data->rsize; 1762 args->wsize = data->wsize; 1763 args->timeo = data->timeo; 1764 args->retrans = data->retrans; 1765 args->acregmin = data->acregmin; 1766 args->acregmax = data->acregmax; 1767 args->acdirmin = data->acdirmin; 1768 args->acdirmax = data->acdirmax; 1769 1770 memcpy(sap, &data->addr, sizeof(data->addr)); 1771 args->nfs_server.addrlen = sizeof(data->addr); 1772 if (!nfs_verify_server_address(sap)) 1773 goto out_no_address; 1774 1775 if (!(data->flags & NFS_MOUNT_TCP)) 1776 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1777 /* N.B. caller will free nfs_server.hostname in all cases */ 1778 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1779 args->namlen = data->namlen; 1780 args->bsize = data->bsize; 1781 1782 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1783 args->auth_flavors[0] = data->pseudoflavor; 1784 if (!args->nfs_server.hostname) 1785 goto out_nomem; 1786 1787 /* 1788 * The legacy version 6 binary mount data from userspace has a 1789 * field used only to transport selinux information into the 1790 * the kernel. To continue to support that functionality we 1791 * have a touch of selinux knowledge here in the NFS code. The 1792 * userspace code converted context=blah to just blah so we are 1793 * converting back to the full string selinux understands. 1794 */ 1795 if (data->context[0]){ 1796 #ifdef CONFIG_SECURITY_SELINUX 1797 int rc; 1798 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1799 if (!opts_str) 1800 return -ENOMEM; 1801 strcpy(opts_str, "context="); 1802 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1803 strcat(opts_str, &data->context[0]); 1804 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1805 kfree(opts_str); 1806 if (rc) 1807 return rc; 1808 #else 1809 return -EINVAL; 1810 #endif 1811 } 1812 1813 break; 1814 default: { 1815 int status; 1816 1817 if (nfs_parse_mount_options((char *)options, args) == 0) 1818 return -EINVAL; 1819 1820 if (!nfs_verify_server_address(sap)) 1821 goto out_no_address; 1822 1823 if (args->version == 4) 1824 #ifdef CONFIG_NFS_V4 1825 return nfs4_validate_text_mount_data(options, 1826 args, dev_name); 1827 #else 1828 goto out_v4_not_compiled; 1829 #endif 1830 1831 nfs_set_port(sap, &args->nfs_server.port, 0); 1832 1833 nfs_set_mount_transport_protocol(args); 1834 1835 status = nfs_parse_devname(dev_name, 1836 &args->nfs_server.hostname, 1837 PAGE_SIZE, 1838 &args->nfs_server.export_path, 1839 NFS_MAXPATHLEN); 1840 if (!status) 1841 status = nfs_try_mount(args, mntfh); 1842 1843 kfree(args->nfs_server.export_path); 1844 args->nfs_server.export_path = NULL; 1845 1846 if (status) 1847 return status; 1848 1849 break; 1850 } 1851 } 1852 1853 #ifndef CONFIG_NFS_V3 1854 if (args->version == 3) 1855 goto out_v3_not_compiled; 1856 #endif /* !CONFIG_NFS_V3 */ 1857 1858 return 0; 1859 1860 out_no_data: 1861 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1862 return -EINVAL; 1863 1864 out_no_v3: 1865 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1866 data->version); 1867 return -EINVAL; 1868 1869 out_no_sec: 1870 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1871 return -EINVAL; 1872 1873 #ifndef CONFIG_NFS_V3 1874 out_v3_not_compiled: 1875 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1876 return -EPROTONOSUPPORT; 1877 #endif /* !CONFIG_NFS_V3 */ 1878 1879 #ifndef CONFIG_NFS_V4 1880 out_v4_not_compiled: 1881 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1882 return -EPROTONOSUPPORT; 1883 #endif /* !CONFIG_NFS_V4 */ 1884 1885 out_nomem: 1886 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1887 return -ENOMEM; 1888 1889 out_no_address: 1890 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1891 return -EINVAL; 1892 1893 out_invalid_fh: 1894 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1895 return -EINVAL; 1896 } 1897 1898 static int 1899 nfs_compare_remount_data(struct nfs_server *nfss, 1900 struct nfs_parsed_mount_data *data) 1901 { 1902 if (data->flags != nfss->flags || 1903 data->rsize != nfss->rsize || 1904 data->wsize != nfss->wsize || 1905 data->retrans != nfss->client->cl_timeout->to_retries || 1906 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1907 data->acregmin != nfss->acregmin / HZ || 1908 data->acregmax != nfss->acregmax / HZ || 1909 data->acdirmin != nfss->acdirmin / HZ || 1910 data->acdirmax != nfss->acdirmax / HZ || 1911 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1912 data->nfs_server.port != nfss->port || 1913 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1914 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1915 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1916 return -EINVAL; 1917 1918 return 0; 1919 } 1920 1921 static int 1922 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1923 { 1924 int error; 1925 struct nfs_server *nfss = sb->s_fs_info; 1926 struct nfs_parsed_mount_data *data; 1927 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1928 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1929 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1930 1931 /* 1932 * Userspace mount programs that send binary options generally send 1933 * them populated with default values. We have no way to know which 1934 * ones were explicitly specified. Fall back to legacy behavior and 1935 * just return success. 1936 */ 1937 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1938 (nfsvers <= 3 && (!options || (options->version >= 1 && 1939 options->version <= 6)))) 1940 return 0; 1941 1942 data = kzalloc(sizeof(*data), GFP_KERNEL); 1943 if (data == NULL) 1944 return -ENOMEM; 1945 1946 /* fill out struct with values from existing mount */ 1947 data->flags = nfss->flags; 1948 data->rsize = nfss->rsize; 1949 data->wsize = nfss->wsize; 1950 data->retrans = nfss->client->cl_timeout->to_retries; 1951 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1952 data->acregmin = nfss->acregmin / HZ; 1953 data->acregmax = nfss->acregmax / HZ; 1954 data->acdirmin = nfss->acdirmin / HZ; 1955 data->acdirmax = nfss->acdirmax / HZ; 1956 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1957 data->nfs_server.port = nfss->port; 1958 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1959 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1960 data->nfs_server.addrlen); 1961 1962 /* overwrite those values with any that were specified */ 1963 error = nfs_parse_mount_options((char *)options, data); 1964 if (error < 0) 1965 goto out; 1966 1967 /* compare new mount options with old ones */ 1968 error = nfs_compare_remount_data(nfss, data); 1969 out: 1970 kfree(data); 1971 return error; 1972 } 1973 1974 /* 1975 * Initialise the common bits of the superblock 1976 */ 1977 static inline void nfs_initialise_sb(struct super_block *sb) 1978 { 1979 struct nfs_server *server = NFS_SB(sb); 1980 1981 sb->s_magic = NFS_SUPER_MAGIC; 1982 1983 /* We probably want something more informative here */ 1984 snprintf(sb->s_id, sizeof(sb->s_id), 1985 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1986 1987 if (sb->s_blocksize == 0) 1988 sb->s_blocksize = nfs_block_bits(server->wsize, 1989 &sb->s_blocksize_bits); 1990 1991 if (server->flags & NFS_MOUNT_NOAC) 1992 sb->s_flags |= MS_SYNCHRONOUS; 1993 1994 sb->s_bdi = &server->backing_dev_info; 1995 1996 nfs_super_set_maxbytes(sb, server->maxfilesize); 1997 } 1998 1999 /* 2000 * Finish setting up an NFS2/3 superblock 2001 */ 2002 static void nfs_fill_super(struct super_block *sb, 2003 struct nfs_parsed_mount_data *data) 2004 { 2005 struct nfs_server *server = NFS_SB(sb); 2006 2007 sb->s_blocksize_bits = 0; 2008 sb->s_blocksize = 0; 2009 if (data->bsize) 2010 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2011 2012 if (server->nfs_client->rpc_ops->version == 3) { 2013 /* The VFS shouldn't apply the umask to mode bits. We will do 2014 * so ourselves when necessary. 2015 */ 2016 sb->s_flags |= MS_POSIXACL; 2017 sb->s_time_gran = 1; 2018 } 2019 2020 sb->s_op = &nfs_sops; 2021 nfs_initialise_sb(sb); 2022 } 2023 2024 /* 2025 * Finish setting up a cloned NFS2/3 superblock 2026 */ 2027 static void nfs_clone_super(struct super_block *sb, 2028 const struct super_block *old_sb) 2029 { 2030 struct nfs_server *server = NFS_SB(sb); 2031 2032 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2033 sb->s_blocksize = old_sb->s_blocksize; 2034 sb->s_maxbytes = old_sb->s_maxbytes; 2035 2036 if (server->nfs_client->rpc_ops->version == 3) { 2037 /* The VFS shouldn't apply the umask to mode bits. We will do 2038 * so ourselves when necessary. 2039 */ 2040 sb->s_flags |= MS_POSIXACL; 2041 sb->s_time_gran = 1; 2042 } 2043 2044 sb->s_op = old_sb->s_op; 2045 nfs_initialise_sb(sb); 2046 } 2047 2048 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2049 { 2050 const struct nfs_server *a = s->s_fs_info; 2051 const struct rpc_clnt *clnt_a = a->client; 2052 const struct rpc_clnt *clnt_b = b->client; 2053 2054 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2055 goto Ebusy; 2056 if (a->nfs_client != b->nfs_client) 2057 goto Ebusy; 2058 if (a->flags != b->flags) 2059 goto Ebusy; 2060 if (a->wsize != b->wsize) 2061 goto Ebusy; 2062 if (a->rsize != b->rsize) 2063 goto Ebusy; 2064 if (a->acregmin != b->acregmin) 2065 goto Ebusy; 2066 if (a->acregmax != b->acregmax) 2067 goto Ebusy; 2068 if (a->acdirmin != b->acdirmin) 2069 goto Ebusy; 2070 if (a->acdirmax != b->acdirmax) 2071 goto Ebusy; 2072 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2073 goto Ebusy; 2074 return 1; 2075 Ebusy: 2076 return 0; 2077 } 2078 2079 struct nfs_sb_mountdata { 2080 struct nfs_server *server; 2081 int mntflags; 2082 }; 2083 2084 static int nfs_set_super(struct super_block *s, void *data) 2085 { 2086 struct nfs_sb_mountdata *sb_mntdata = data; 2087 struct nfs_server *server = sb_mntdata->server; 2088 int ret; 2089 2090 s->s_flags = sb_mntdata->mntflags; 2091 s->s_fs_info = server; 2092 ret = set_anon_super(s, server); 2093 if (ret == 0) 2094 server->s_dev = s->s_dev; 2095 return ret; 2096 } 2097 2098 static int nfs_compare_super_address(struct nfs_server *server1, 2099 struct nfs_server *server2) 2100 { 2101 struct sockaddr *sap1, *sap2; 2102 2103 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2104 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2105 2106 if (sap1->sa_family != sap2->sa_family) 2107 return 0; 2108 2109 switch (sap1->sa_family) { 2110 case AF_INET: { 2111 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2112 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2113 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2114 return 0; 2115 if (sin1->sin_port != sin2->sin_port) 2116 return 0; 2117 break; 2118 } 2119 case AF_INET6: { 2120 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2121 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2122 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2123 return 0; 2124 if (sin1->sin6_port != sin2->sin6_port) 2125 return 0; 2126 break; 2127 } 2128 default: 2129 return 0; 2130 } 2131 2132 return 1; 2133 } 2134 2135 static int nfs_compare_super(struct super_block *sb, void *data) 2136 { 2137 struct nfs_sb_mountdata *sb_mntdata = data; 2138 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2139 int mntflags = sb_mntdata->mntflags; 2140 2141 if (!nfs_compare_super_address(old, server)) 2142 return 0; 2143 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2144 if (old->flags & NFS_MOUNT_UNSHARED) 2145 return 0; 2146 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2147 return 0; 2148 return nfs_compare_mount_options(sb, server, mntflags); 2149 } 2150 2151 static int nfs_bdi_register(struct nfs_server *server) 2152 { 2153 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2154 } 2155 2156 static int nfs_get_sb(struct file_system_type *fs_type, 2157 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2158 { 2159 struct nfs_server *server = NULL; 2160 struct super_block *s; 2161 struct nfs_parsed_mount_data *data; 2162 struct nfs_fh *mntfh; 2163 struct dentry *mntroot; 2164 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2165 struct nfs_sb_mountdata sb_mntdata = { 2166 .mntflags = flags, 2167 }; 2168 int error = -ENOMEM; 2169 2170 data = nfs_alloc_parsed_mount_data(3); 2171 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2172 if (data == NULL || mntfh == NULL) 2173 goto out_free_fh; 2174 2175 security_init_mnt_opts(&data->lsm_opts); 2176 2177 /* Validate the mount data */ 2178 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2179 if (error < 0) 2180 goto out; 2181 2182 #ifdef CONFIG_NFS_V4 2183 if (data->version == 4) { 2184 error = nfs4_try_mount(flags, dev_name, data, mnt); 2185 kfree(data->client_address); 2186 goto out; 2187 } 2188 #endif /* CONFIG_NFS_V4 */ 2189 2190 /* Get a volume representation */ 2191 server = nfs_create_server(data, mntfh); 2192 if (IS_ERR(server)) { 2193 error = PTR_ERR(server); 2194 goto out; 2195 } 2196 sb_mntdata.server = server; 2197 2198 if (server->flags & NFS_MOUNT_UNSHARED) 2199 compare_super = NULL; 2200 2201 /* Get a superblock - note that we may end up sharing one that already exists */ 2202 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2203 if (IS_ERR(s)) { 2204 error = PTR_ERR(s); 2205 goto out_err_nosb; 2206 } 2207 2208 if (s->s_fs_info != server) { 2209 nfs_free_server(server); 2210 server = NULL; 2211 } else { 2212 error = nfs_bdi_register(server); 2213 if (error) 2214 goto error_splat_super; 2215 } 2216 2217 if (!s->s_root) { 2218 /* initial superblock/root creation */ 2219 nfs_fill_super(s, data); 2220 nfs_fscache_get_super_cookie( 2221 s, data ? data->fscache_uniq : NULL, NULL); 2222 } 2223 2224 mntroot = nfs_get_root(s, mntfh); 2225 if (IS_ERR(mntroot)) { 2226 error = PTR_ERR(mntroot); 2227 goto error_splat_super; 2228 } 2229 2230 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2231 if (error) 2232 goto error_splat_root; 2233 2234 s->s_flags |= MS_ACTIVE; 2235 mnt->mnt_sb = s; 2236 mnt->mnt_root = mntroot; 2237 error = 0; 2238 2239 out: 2240 kfree(data->nfs_server.hostname); 2241 kfree(data->mount_server.hostname); 2242 kfree(data->fscache_uniq); 2243 security_free_mnt_opts(&data->lsm_opts); 2244 out_free_fh: 2245 kfree(mntfh); 2246 kfree(data); 2247 return error; 2248 2249 out_err_nosb: 2250 nfs_free_server(server); 2251 goto out; 2252 2253 error_splat_root: 2254 dput(mntroot); 2255 error_splat_super: 2256 deactivate_locked_super(s); 2257 goto out; 2258 } 2259 2260 /* 2261 * Destroy an NFS2/3 superblock 2262 */ 2263 static void nfs_kill_super(struct super_block *s) 2264 { 2265 struct nfs_server *server = NFS_SB(s); 2266 2267 kill_anon_super(s); 2268 bdi_unregister(&server->backing_dev_info); 2269 nfs_fscache_release_super_cookie(s); 2270 nfs_free_server(server); 2271 } 2272 2273 /* 2274 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2275 */ 2276 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2277 const char *dev_name, void *raw_data, 2278 struct vfsmount *mnt) 2279 { 2280 struct nfs_clone_mount *data = raw_data; 2281 struct super_block *s; 2282 struct nfs_server *server; 2283 struct dentry *mntroot; 2284 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2285 struct nfs_sb_mountdata sb_mntdata = { 2286 .mntflags = flags, 2287 }; 2288 int error; 2289 2290 dprintk("--> nfs_xdev_get_sb()\n"); 2291 2292 /* create a new volume representation */ 2293 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2294 if (IS_ERR(server)) { 2295 error = PTR_ERR(server); 2296 goto out_err_noserver; 2297 } 2298 sb_mntdata.server = server; 2299 2300 if (server->flags & NFS_MOUNT_UNSHARED) 2301 compare_super = NULL; 2302 2303 /* Get a superblock - note that we may end up sharing one that already exists */ 2304 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2305 if (IS_ERR(s)) { 2306 error = PTR_ERR(s); 2307 goto out_err_nosb; 2308 } 2309 2310 if (s->s_fs_info != server) { 2311 nfs_free_server(server); 2312 server = NULL; 2313 } else { 2314 error = nfs_bdi_register(server); 2315 if (error) 2316 goto error_splat_super; 2317 } 2318 2319 if (!s->s_root) { 2320 /* initial superblock/root creation */ 2321 nfs_clone_super(s, data->sb); 2322 nfs_fscache_get_super_cookie(s, NULL, data); 2323 } 2324 2325 mntroot = nfs_get_root(s, data->fh); 2326 if (IS_ERR(mntroot)) { 2327 error = PTR_ERR(mntroot); 2328 goto error_splat_super; 2329 } 2330 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2331 dput(mntroot); 2332 error = -ESTALE; 2333 goto error_splat_super; 2334 } 2335 2336 s->s_flags |= MS_ACTIVE; 2337 mnt->mnt_sb = s; 2338 mnt->mnt_root = mntroot; 2339 2340 /* clone any lsm security options from the parent to the new sb */ 2341 security_sb_clone_mnt_opts(data->sb, s); 2342 2343 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2344 return 0; 2345 2346 out_err_nosb: 2347 nfs_free_server(server); 2348 out_err_noserver: 2349 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2350 return error; 2351 2352 error_splat_super: 2353 deactivate_locked_super(s); 2354 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2355 return error; 2356 } 2357 2358 #ifdef CONFIG_NFS_V4 2359 2360 /* 2361 * Finish setting up a cloned NFS4 superblock 2362 */ 2363 static void nfs4_clone_super(struct super_block *sb, 2364 const struct super_block *old_sb) 2365 { 2366 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2367 sb->s_blocksize = old_sb->s_blocksize; 2368 sb->s_maxbytes = old_sb->s_maxbytes; 2369 sb->s_time_gran = 1; 2370 sb->s_op = old_sb->s_op; 2371 nfs_initialise_sb(sb); 2372 } 2373 2374 /* 2375 * Set up an NFS4 superblock 2376 */ 2377 static void nfs4_fill_super(struct super_block *sb) 2378 { 2379 sb->s_time_gran = 1; 2380 sb->s_op = &nfs4_sops; 2381 nfs_initialise_sb(sb); 2382 } 2383 2384 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2385 { 2386 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2387 } 2388 2389 static int nfs4_validate_text_mount_data(void *options, 2390 struct nfs_parsed_mount_data *args, 2391 const char *dev_name) 2392 { 2393 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2394 2395 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2396 2397 nfs_validate_transport_protocol(args); 2398 2399 nfs4_validate_mount_flags(args); 2400 2401 if (args->version != 4) { 2402 dfprintk(MOUNT, 2403 "NFS4: Illegal mount version\n"); 2404 return -EINVAL; 2405 } 2406 2407 if (args->auth_flavor_len > 1) { 2408 dfprintk(MOUNT, 2409 "NFS4: Too many RPC auth flavours specified\n"); 2410 return -EINVAL; 2411 } 2412 2413 if (args->client_address == NULL) { 2414 dfprintk(MOUNT, 2415 "NFS4: mount program didn't pass callback address\n"); 2416 return -EINVAL; 2417 } 2418 2419 return nfs_parse_devname(dev_name, 2420 &args->nfs_server.hostname, 2421 NFS4_MAXNAMLEN, 2422 &args->nfs_server.export_path, 2423 NFS4_MAXPATHLEN); 2424 } 2425 2426 /* 2427 * Validate NFSv4 mount options 2428 */ 2429 static int nfs4_validate_mount_data(void *options, 2430 struct nfs_parsed_mount_data *args, 2431 const char *dev_name) 2432 { 2433 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2434 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2435 char *c; 2436 2437 if (data == NULL) 2438 goto out_no_data; 2439 2440 switch (data->version) { 2441 case 1: 2442 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2443 goto out_no_address; 2444 if (data->host_addrlen == 0) 2445 goto out_no_address; 2446 args->nfs_server.addrlen = data->host_addrlen; 2447 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2448 return -EFAULT; 2449 if (!nfs_verify_server_address(sap)) 2450 goto out_no_address; 2451 2452 if (data->auth_flavourlen) { 2453 if (data->auth_flavourlen > 1) 2454 goto out_inval_auth; 2455 if (copy_from_user(&args->auth_flavors[0], 2456 data->auth_flavours, 2457 sizeof(args->auth_flavors[0]))) 2458 return -EFAULT; 2459 } 2460 2461 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2462 if (IS_ERR(c)) 2463 return PTR_ERR(c); 2464 args->nfs_server.hostname = c; 2465 2466 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2467 if (IS_ERR(c)) 2468 return PTR_ERR(c); 2469 args->nfs_server.export_path = c; 2470 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2471 2472 c = strndup_user(data->client_addr.data, 16); 2473 if (IS_ERR(c)) 2474 return PTR_ERR(c); 2475 args->client_address = c; 2476 2477 /* 2478 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2479 * can deal with. 2480 */ 2481 2482 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2483 args->rsize = data->rsize; 2484 args->wsize = data->wsize; 2485 args->timeo = data->timeo; 2486 args->retrans = data->retrans; 2487 args->acregmin = data->acregmin; 2488 args->acregmax = data->acregmax; 2489 args->acdirmin = data->acdirmin; 2490 args->acdirmax = data->acdirmax; 2491 args->nfs_server.protocol = data->proto; 2492 nfs_validate_transport_protocol(args); 2493 2494 break; 2495 default: 2496 if (nfs_parse_mount_options((char *)options, args) == 0) 2497 return -EINVAL; 2498 2499 if (!nfs_verify_server_address(sap)) 2500 return -EINVAL; 2501 2502 return nfs4_validate_text_mount_data(options, args, dev_name); 2503 } 2504 2505 return 0; 2506 2507 out_no_data: 2508 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2509 return -EINVAL; 2510 2511 out_inval_auth: 2512 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2513 data->auth_flavourlen); 2514 return -EINVAL; 2515 2516 out_no_address: 2517 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2518 return -EINVAL; 2519 } 2520 2521 /* 2522 * Get the superblock for the NFS4 root partition 2523 */ 2524 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2525 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2526 { 2527 struct nfs_parsed_mount_data *data = raw_data; 2528 struct super_block *s; 2529 struct nfs_server *server; 2530 struct nfs_fh *mntfh; 2531 struct dentry *mntroot; 2532 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2533 struct nfs_sb_mountdata sb_mntdata = { 2534 .mntflags = flags, 2535 }; 2536 int error = -ENOMEM; 2537 2538 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2539 if (data == NULL || mntfh == NULL) 2540 goto out_free_fh; 2541 2542 security_init_mnt_opts(&data->lsm_opts); 2543 2544 /* Get a volume representation */ 2545 server = nfs4_create_server(data, mntfh); 2546 if (IS_ERR(server)) { 2547 error = PTR_ERR(server); 2548 goto out; 2549 } 2550 sb_mntdata.server = server; 2551 2552 if (server->flags & NFS4_MOUNT_UNSHARED) 2553 compare_super = NULL; 2554 2555 /* Get a superblock - note that we may end up sharing one that already exists */ 2556 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2557 if (IS_ERR(s)) { 2558 error = PTR_ERR(s); 2559 goto out_free; 2560 } 2561 2562 if (s->s_fs_info != server) { 2563 nfs_free_server(server); 2564 server = NULL; 2565 } else { 2566 error = nfs_bdi_register(server); 2567 if (error) 2568 goto error_splat_super; 2569 } 2570 2571 if (!s->s_root) { 2572 /* initial superblock/root creation */ 2573 nfs4_fill_super(s); 2574 nfs_fscache_get_super_cookie( 2575 s, data ? data->fscache_uniq : NULL, NULL); 2576 } 2577 2578 mntroot = nfs4_get_root(s, mntfh); 2579 if (IS_ERR(mntroot)) { 2580 error = PTR_ERR(mntroot); 2581 goto error_splat_super; 2582 } 2583 2584 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2585 if (error) 2586 goto error_splat_root; 2587 2588 s->s_flags |= MS_ACTIVE; 2589 mnt->mnt_sb = s; 2590 mnt->mnt_root = mntroot; 2591 error = 0; 2592 2593 out: 2594 security_free_mnt_opts(&data->lsm_opts); 2595 out_free_fh: 2596 kfree(mntfh); 2597 return error; 2598 2599 out_free: 2600 nfs_free_server(server); 2601 goto out; 2602 2603 error_splat_root: 2604 dput(mntroot); 2605 error_splat_super: 2606 deactivate_locked_super(s); 2607 goto out; 2608 } 2609 2610 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2611 int flags, void *data, const char *hostname) 2612 { 2613 struct vfsmount *root_mnt; 2614 char *root_devname; 2615 size_t len; 2616 2617 len = strlen(hostname) + 3; 2618 root_devname = kmalloc(len, GFP_KERNEL); 2619 if (root_devname == NULL) 2620 return ERR_PTR(-ENOMEM); 2621 snprintf(root_devname, len, "%s:/", hostname); 2622 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2623 kfree(root_devname); 2624 return root_mnt; 2625 } 2626 2627 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2628 { 2629 char *page = (char *) __get_free_page(GFP_KERNEL); 2630 char *devname, *tmp; 2631 2632 if (page == NULL) 2633 return; 2634 devname = nfs_path(path->mnt->mnt_devname, 2635 path->mnt->mnt_root, path->dentry, 2636 page, PAGE_SIZE); 2637 if (devname == NULL) 2638 goto out_freepage; 2639 tmp = kstrdup(devname, GFP_KERNEL); 2640 if (tmp == NULL) 2641 goto out_freepage; 2642 kfree(mnt->mnt_devname); 2643 mnt->mnt_devname = tmp; 2644 out_freepage: 2645 free_page((unsigned long)page); 2646 } 2647 2648 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2649 const char *export_path, struct vfsmount *mnt_target) 2650 { 2651 struct mnt_namespace *ns_private; 2652 struct nameidata nd; 2653 struct super_block *s; 2654 int ret; 2655 2656 ns_private = create_mnt_ns(root_mnt); 2657 ret = PTR_ERR(ns_private); 2658 if (IS_ERR(ns_private)) 2659 goto out_mntput; 2660 2661 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2662 export_path, LOOKUP_FOLLOW, &nd); 2663 2664 put_mnt_ns(ns_private); 2665 2666 if (ret != 0) 2667 goto out_err; 2668 2669 s = nd.path.mnt->mnt_sb; 2670 atomic_inc(&s->s_active); 2671 mnt_target->mnt_sb = s; 2672 mnt_target->mnt_root = dget(nd.path.dentry); 2673 2674 /* Correct the device pathname */ 2675 nfs_fix_devname(&nd.path, mnt_target); 2676 2677 path_put(&nd.path); 2678 down_write(&s->s_umount); 2679 return 0; 2680 out_mntput: 2681 mntput(root_mnt); 2682 out_err: 2683 return ret; 2684 } 2685 2686 static int nfs4_try_mount(int flags, const char *dev_name, 2687 struct nfs_parsed_mount_data *data, 2688 struct vfsmount *mnt) 2689 { 2690 char *export_path; 2691 struct vfsmount *root_mnt; 2692 int error; 2693 2694 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2695 2696 export_path = data->nfs_server.export_path; 2697 data->nfs_server.export_path = "/"; 2698 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2699 data->nfs_server.hostname); 2700 data->nfs_server.export_path = export_path; 2701 2702 error = PTR_ERR(root_mnt); 2703 if (IS_ERR(root_mnt)) 2704 goto out; 2705 2706 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2707 2708 out: 2709 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2710 error != 0 ? " [error]" : ""); 2711 return error; 2712 } 2713 2714 /* 2715 * Get the superblock for an NFS4 mountpoint 2716 */ 2717 static int nfs4_get_sb(struct file_system_type *fs_type, 2718 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2719 { 2720 struct nfs_parsed_mount_data *data; 2721 int error = -ENOMEM; 2722 2723 data = nfs_alloc_parsed_mount_data(4); 2724 if (data == NULL) 2725 goto out_free_data; 2726 2727 /* Validate the mount data */ 2728 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2729 if (error < 0) 2730 goto out; 2731 2732 error = nfs4_try_mount(flags, dev_name, data, mnt); 2733 2734 out: 2735 kfree(data->client_address); 2736 kfree(data->nfs_server.export_path); 2737 kfree(data->nfs_server.hostname); 2738 kfree(data->fscache_uniq); 2739 out_free_data: 2740 kfree(data); 2741 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2742 error != 0 ? " [error]" : ""); 2743 return error; 2744 } 2745 2746 static void nfs4_kill_super(struct super_block *sb) 2747 { 2748 struct nfs_server *server = NFS_SB(sb); 2749 2750 dprintk("--> %s\n", __func__); 2751 nfs_super_return_all_delegations(sb); 2752 kill_anon_super(sb); 2753 nfs_fscache_release_super_cookie(sb); 2754 nfs_free_server(server); 2755 dprintk("<-- %s\n", __func__); 2756 } 2757 2758 /* 2759 * Clone an NFS4 server record on xdev traversal (FSID-change) 2760 */ 2761 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2762 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 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2770 struct nfs_sb_mountdata sb_mntdata = { 2771 .mntflags = flags, 2772 }; 2773 int error; 2774 2775 dprintk("--> nfs4_xdev_get_sb()\n"); 2776 2777 /* create a new volume representation */ 2778 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2779 if (IS_ERR(server)) { 2780 error = PTR_ERR(server); 2781 goto out_err_noserver; 2782 } 2783 sb_mntdata.server = server; 2784 2785 if (server->flags & NFS4_MOUNT_UNSHARED) 2786 compare_super = NULL; 2787 2788 /* Get a superblock - note that we may end up sharing one that already exists */ 2789 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2790 if (IS_ERR(s)) { 2791 error = PTR_ERR(s); 2792 goto out_err_nosb; 2793 } 2794 2795 if (s->s_fs_info != server) { 2796 nfs_free_server(server); 2797 server = NULL; 2798 } else { 2799 error = nfs_bdi_register(server); 2800 if (error) 2801 goto error_splat_super; 2802 } 2803 2804 if (!s->s_root) { 2805 /* initial superblock/root creation */ 2806 nfs4_clone_super(s, data->sb); 2807 nfs_fscache_get_super_cookie(s, NULL, data); 2808 } 2809 2810 mntroot = nfs4_get_root(s, data->fh); 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_xdev_get_sb() = 0\n"); 2828 return 0; 2829 2830 out_err_nosb: 2831 nfs_free_server(server); 2832 out_err_noserver: 2833 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2834 return error; 2835 2836 error_splat_super: 2837 deactivate_locked_super(s); 2838 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2839 return error; 2840 } 2841 2842 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2843 int flags, const char *dev_name, void *raw_data, 2844 struct vfsmount *mnt) 2845 { 2846 struct nfs_clone_mount *data = raw_data; 2847 struct super_block *s; 2848 struct nfs_server *server; 2849 struct dentry *mntroot; 2850 struct nfs_fh mntfh; 2851 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2852 struct nfs_sb_mountdata sb_mntdata = { 2853 .mntflags = flags, 2854 }; 2855 int error; 2856 2857 dprintk("--> nfs4_referral_get_sb()\n"); 2858 2859 /* create a new volume representation */ 2860 server = nfs4_create_referral_server(data, &mntfh); 2861 if (IS_ERR(server)) { 2862 error = PTR_ERR(server); 2863 goto out_err_noserver; 2864 } 2865 sb_mntdata.server = server; 2866 2867 if (server->flags & NFS4_MOUNT_UNSHARED) 2868 compare_super = NULL; 2869 2870 /* Get a superblock - note that we may end up sharing one that already exists */ 2871 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2872 if (IS_ERR(s)) { 2873 error = PTR_ERR(s); 2874 goto out_err_nosb; 2875 } 2876 2877 if (s->s_fs_info != server) { 2878 nfs_free_server(server); 2879 server = NULL; 2880 } else { 2881 error = nfs_bdi_register(server); 2882 if (error) 2883 goto error_splat_super; 2884 } 2885 2886 if (!s->s_root) { 2887 /* initial superblock/root creation */ 2888 nfs4_fill_super(s); 2889 nfs_fscache_get_super_cookie(s, NULL, data); 2890 } 2891 2892 mntroot = nfs4_get_root(s, &mntfh); 2893 if (IS_ERR(mntroot)) { 2894 error = PTR_ERR(mntroot); 2895 goto error_splat_super; 2896 } 2897 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2898 dput(mntroot); 2899 error = -ESTALE; 2900 goto error_splat_super; 2901 } 2902 2903 s->s_flags |= MS_ACTIVE; 2904 mnt->mnt_sb = s; 2905 mnt->mnt_root = mntroot; 2906 2907 security_sb_clone_mnt_opts(data->sb, s); 2908 2909 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2910 return 0; 2911 2912 out_err_nosb: 2913 nfs_free_server(server); 2914 out_err_noserver: 2915 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2916 return error; 2917 2918 error_splat_super: 2919 deactivate_locked_super(s); 2920 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2921 return error; 2922 } 2923 2924 /* 2925 * Create an NFS4 server record on referral traversal 2926 */ 2927 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 2928 int flags, const char *dev_name, void *raw_data, 2929 struct vfsmount *mnt) 2930 { 2931 struct nfs_clone_mount *data = raw_data; 2932 char *export_path; 2933 struct vfsmount *root_mnt; 2934 int error; 2935 2936 dprintk("--> nfs4_referral_get_sb()\n"); 2937 2938 export_path = data->mnt_path; 2939 data->mnt_path = "/"; 2940 2941 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2942 flags, data, data->hostname); 2943 data->mnt_path = export_path; 2944 2945 error = PTR_ERR(root_mnt); 2946 if (IS_ERR(root_mnt)) 2947 goto out; 2948 2949 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2950 out: 2951 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 2952 error != 0 ? " [error]" : ""); 2953 return error; 2954 } 2955 2956 #endif /* CONFIG_NFS_V4 */ 2957