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 <linux/slab.h> 52 #include <net/ipv6.h> 53 #include <linux/netdevice.h> 54 #include <linux/nfs_xdr.h> 55 #include <linux/magic.h> 56 #include <linux/parser.h> 57 58 #include <asm/system.h> 59 #include <asm/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 68 #define NFSDBG_FACILITY NFSDBG_VFS 69 70 enum { 71 /* Mount options that take no arguments */ 72 Opt_soft, Opt_hard, 73 Opt_posix, Opt_noposix, 74 Opt_cto, Opt_nocto, 75 Opt_ac, Opt_noac, 76 Opt_lock, Opt_nolock, 77 Opt_v2, Opt_v3, Opt_v4, 78 Opt_udp, Opt_tcp, Opt_rdma, 79 Opt_acl, Opt_noacl, 80 Opt_rdirplus, Opt_nordirplus, 81 Opt_sharecache, Opt_nosharecache, 82 Opt_resvport, Opt_noresvport, 83 Opt_fscache, Opt_nofscache, 84 85 /* Mount options that take integer arguments */ 86 Opt_port, 87 Opt_rsize, Opt_wsize, Opt_bsize, 88 Opt_timeo, Opt_retrans, 89 Opt_acregmin, Opt_acregmax, 90 Opt_acdirmin, Opt_acdirmax, 91 Opt_actimeo, 92 Opt_namelen, 93 Opt_mountport, 94 Opt_mountvers, 95 Opt_nfsvers, 96 Opt_minorversion, 97 98 /* Mount options that take string arguments */ 99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 100 Opt_addr, Opt_mountaddr, Opt_clientaddr, 101 Opt_lookupcache, 102 Opt_fscache_uniq, 103 104 /* Special mount options */ 105 Opt_userspace, Opt_deprecated, Opt_sloppy, 106 107 Opt_err 108 }; 109 110 static const match_table_t nfs_mount_option_tokens = { 111 { Opt_userspace, "bg" }, 112 { Opt_userspace, "fg" }, 113 { Opt_userspace, "retry=%s" }, 114 115 { Opt_sloppy, "sloppy" }, 116 117 { Opt_soft, "soft" }, 118 { Opt_hard, "hard" }, 119 { Opt_deprecated, "intr" }, 120 { Opt_deprecated, "nointr" }, 121 { Opt_posix, "posix" }, 122 { Opt_noposix, "noposix" }, 123 { Opt_cto, "cto" }, 124 { Opt_nocto, "nocto" }, 125 { Opt_ac, "ac" }, 126 { Opt_noac, "noac" }, 127 { Opt_lock, "lock" }, 128 { Opt_nolock, "nolock" }, 129 { Opt_v2, "v2" }, 130 { Opt_v3, "v3" }, 131 { Opt_v4, "v4" }, 132 { Opt_udp, "udp" }, 133 { Opt_tcp, "tcp" }, 134 { Opt_rdma, "rdma" }, 135 { Opt_acl, "acl" }, 136 { Opt_noacl, "noacl" }, 137 { Opt_rdirplus, "rdirplus" }, 138 { Opt_nordirplus, "nordirplus" }, 139 { Opt_sharecache, "sharecache" }, 140 { Opt_nosharecache, "nosharecache" }, 141 { Opt_resvport, "resvport" }, 142 { Opt_noresvport, "noresvport" }, 143 { Opt_fscache, "fsc" }, 144 { Opt_fscache_uniq, "fsc=%s" }, 145 { Opt_nofscache, "nofsc" }, 146 147 { Opt_port, "port=%s" }, 148 { Opt_rsize, "rsize=%s" }, 149 { Opt_wsize, "wsize=%s" }, 150 { Opt_bsize, "bsize=%s" }, 151 { Opt_timeo, "timeo=%s" }, 152 { Opt_retrans, "retrans=%s" }, 153 { Opt_acregmin, "acregmin=%s" }, 154 { Opt_acregmax, "acregmax=%s" }, 155 { Opt_acdirmin, "acdirmin=%s" }, 156 { Opt_acdirmax, "acdirmax=%s" }, 157 { Opt_actimeo, "actimeo=%s" }, 158 { Opt_namelen, "namlen=%s" }, 159 { Opt_mountport, "mountport=%s" }, 160 { Opt_mountvers, "mountvers=%s" }, 161 { Opt_nfsvers, "nfsvers=%s" }, 162 { Opt_nfsvers, "vers=%s" }, 163 { Opt_minorversion, "minorversion=%s" }, 164 165 { Opt_sec, "sec=%s" }, 166 { Opt_proto, "proto=%s" }, 167 { Opt_mountproto, "mountproto=%s" }, 168 { Opt_addr, "addr=%s" }, 169 { Opt_clientaddr, "clientaddr=%s" }, 170 { Opt_mounthost, "mounthost=%s" }, 171 { Opt_mountaddr, "mountaddr=%s" }, 172 173 { Opt_lookupcache, "lookupcache=%s" }, 174 175 { Opt_err, NULL } 176 }; 177 178 enum { 179 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 180 181 Opt_xprt_err 182 }; 183 184 static const match_table_t nfs_xprt_protocol_tokens = { 185 { Opt_xprt_udp, "udp" }, 186 { Opt_xprt_udp6, "udp6" }, 187 { Opt_xprt_tcp, "tcp" }, 188 { Opt_xprt_tcp6, "tcp6" }, 189 { Opt_xprt_rdma, "rdma" }, 190 191 { Opt_xprt_err, NULL } 192 }; 193 194 enum { 195 Opt_sec_none, Opt_sec_sys, 196 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 197 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 198 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 199 200 Opt_sec_err 201 }; 202 203 static const match_table_t nfs_secflavor_tokens = { 204 { Opt_sec_none, "none" }, 205 { Opt_sec_none, "null" }, 206 { Opt_sec_sys, "sys" }, 207 208 { Opt_sec_krb5, "krb5" }, 209 { Opt_sec_krb5i, "krb5i" }, 210 { Opt_sec_krb5p, "krb5p" }, 211 212 { Opt_sec_lkey, "lkey" }, 213 { Opt_sec_lkeyi, "lkeyi" }, 214 { Opt_sec_lkeyp, "lkeyp" }, 215 216 { Opt_sec_spkm, "spkm3" }, 217 { Opt_sec_spkmi, "spkm3i" }, 218 { Opt_sec_spkmp, "spkm3p" }, 219 220 { Opt_sec_err, NULL } 221 }; 222 223 enum { 224 Opt_lookupcache_all, Opt_lookupcache_positive, 225 Opt_lookupcache_none, 226 227 Opt_lookupcache_err 228 }; 229 230 static match_table_t nfs_lookupcache_tokens = { 231 { Opt_lookupcache_all, "all" }, 232 { Opt_lookupcache_positive, "pos" }, 233 { Opt_lookupcache_positive, "positive" }, 234 { Opt_lookupcache_none, "none" }, 235 236 { Opt_lookupcache_err, NULL } 237 }; 238 239 240 static void nfs_umount_begin(struct super_block *); 241 static int nfs_statfs(struct dentry *, struct kstatfs *); 242 static int nfs_show_options(struct seq_file *, struct vfsmount *); 243 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 244 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 245 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 247 static void nfs_put_super(struct super_block *); 248 static void nfs_kill_super(struct super_block *); 249 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 250 251 static struct file_system_type nfs_fs_type = { 252 .owner = THIS_MODULE, 253 .name = "nfs", 254 .get_sb = nfs_get_sb, 255 .kill_sb = nfs_kill_super, 256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 257 }; 258 259 struct file_system_type nfs_xdev_fs_type = { 260 .owner = THIS_MODULE, 261 .name = "nfs", 262 .get_sb = nfs_xdev_get_sb, 263 .kill_sb = nfs_kill_super, 264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 265 }; 266 267 static const struct super_operations nfs_sops = { 268 .alloc_inode = nfs_alloc_inode, 269 .destroy_inode = nfs_destroy_inode, 270 .write_inode = nfs_write_inode, 271 .put_super = nfs_put_super, 272 .statfs = nfs_statfs, 273 .clear_inode = nfs_clear_inode, 274 .umount_begin = nfs_umount_begin, 275 .show_options = nfs_show_options, 276 .show_stats = nfs_show_stats, 277 .remount_fs = nfs_remount, 278 }; 279 280 #ifdef CONFIG_NFS_V4 281 static int nfs4_validate_text_mount_data(void *options, 282 struct nfs_parsed_mount_data *args, const char *dev_name); 283 static int nfs4_try_mount(int flags, const char *dev_name, 284 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 285 static int nfs4_get_sb(struct file_system_type *fs_type, 286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 287 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 288 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 289 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 290 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 291 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 293 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 294 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 295 static void nfs4_kill_super(struct super_block *sb); 296 297 static struct file_system_type nfs4_fs_type = { 298 .owner = THIS_MODULE, 299 .name = "nfs4", 300 .get_sb = nfs4_get_sb, 301 .kill_sb = nfs4_kill_super, 302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 303 }; 304 305 static struct file_system_type nfs4_remote_fs_type = { 306 .owner = THIS_MODULE, 307 .name = "nfs4", 308 .get_sb = nfs4_remote_get_sb, 309 .kill_sb = nfs4_kill_super, 310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 311 }; 312 313 struct file_system_type nfs4_xdev_fs_type = { 314 .owner = THIS_MODULE, 315 .name = "nfs4", 316 .get_sb = nfs4_xdev_get_sb, 317 .kill_sb = nfs4_kill_super, 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 319 }; 320 321 static struct file_system_type nfs4_remote_referral_fs_type = { 322 .owner = THIS_MODULE, 323 .name = "nfs4", 324 .get_sb = nfs4_remote_referral_get_sb, 325 .kill_sb = nfs4_kill_super, 326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 327 }; 328 329 struct file_system_type nfs4_referral_fs_type = { 330 .owner = THIS_MODULE, 331 .name = "nfs4", 332 .get_sb = nfs4_referral_get_sb, 333 .kill_sb = nfs4_kill_super, 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 335 }; 336 337 static const struct super_operations nfs4_sops = { 338 .alloc_inode = nfs_alloc_inode, 339 .destroy_inode = nfs_destroy_inode, 340 .write_inode = nfs_write_inode, 341 .put_super = nfs_put_super, 342 .statfs = nfs_statfs, 343 .clear_inode = nfs4_clear_inode, 344 .umount_begin = nfs_umount_begin, 345 .show_options = nfs_show_options, 346 .show_stats = nfs_show_stats, 347 .remount_fs = nfs_remount, 348 }; 349 #endif 350 351 static struct shrinker acl_shrinker = { 352 .shrink = nfs_access_cache_shrinker, 353 .seeks = DEFAULT_SEEKS, 354 }; 355 356 /* 357 * Register the NFS filesystems 358 */ 359 int __init register_nfs_fs(void) 360 { 361 int ret; 362 363 ret = register_filesystem(&nfs_fs_type); 364 if (ret < 0) 365 goto error_0; 366 367 ret = nfs_register_sysctl(); 368 if (ret < 0) 369 goto error_1; 370 #ifdef CONFIG_NFS_V4 371 ret = register_filesystem(&nfs4_fs_type); 372 if (ret < 0) 373 goto error_2; 374 #endif 375 register_shrinker(&acl_shrinker); 376 return 0; 377 378 #ifdef CONFIG_NFS_V4 379 error_2: 380 nfs_unregister_sysctl(); 381 #endif 382 error_1: 383 unregister_filesystem(&nfs_fs_type); 384 error_0: 385 return ret; 386 } 387 388 /* 389 * Unregister the NFS filesystems 390 */ 391 void __exit unregister_nfs_fs(void) 392 { 393 unregister_shrinker(&acl_shrinker); 394 #ifdef CONFIG_NFS_V4 395 unregister_filesystem(&nfs4_fs_type); 396 #endif 397 nfs_unregister_sysctl(); 398 unregister_filesystem(&nfs_fs_type); 399 } 400 401 void nfs_sb_active(struct super_block *sb) 402 { 403 struct nfs_server *server = NFS_SB(sb); 404 405 if (atomic_inc_return(&server->active) == 1) 406 atomic_inc(&sb->s_active); 407 } 408 409 void nfs_sb_deactive(struct super_block *sb) 410 { 411 struct nfs_server *server = NFS_SB(sb); 412 413 if (atomic_dec_and_test(&server->active)) 414 deactivate_super(sb); 415 } 416 417 /* 418 * Deliver file system statistics to userspace 419 */ 420 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 421 { 422 struct nfs_server *server = NFS_SB(dentry->d_sb); 423 unsigned char blockbits; 424 unsigned long blockres; 425 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 426 struct nfs_fattr fattr; 427 struct nfs_fsstat res = { 428 .fattr = &fattr, 429 }; 430 int error; 431 432 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 433 if (error < 0) 434 goto out_err; 435 buf->f_type = NFS_SUPER_MAGIC; 436 437 /* 438 * Current versions of glibc do not correctly handle the 439 * case where f_frsize != f_bsize. Eventually we want to 440 * report the value of wtmult in this field. 441 */ 442 buf->f_frsize = dentry->d_sb->s_blocksize; 443 444 /* 445 * On most *nix systems, f_blocks, f_bfree, and f_bavail 446 * are reported in units of f_frsize. Linux hasn't had 447 * an f_frsize field in its statfs struct until recently, 448 * thus historically Linux's sys_statfs reports these 449 * fields in units of f_bsize. 450 */ 451 buf->f_bsize = dentry->d_sb->s_blocksize; 452 blockbits = dentry->d_sb->s_blocksize_bits; 453 blockres = (1 << blockbits) - 1; 454 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 455 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 456 buf->f_bavail = (res.abytes + blockres) >> blockbits; 457 458 buf->f_files = res.tfiles; 459 buf->f_ffree = res.afiles; 460 461 buf->f_namelen = server->namelen; 462 463 return 0; 464 465 out_err: 466 dprintk("%s: statfs error = %d\n", __func__, -error); 467 return error; 468 } 469 470 /* 471 * Map the security flavour number to a name 472 */ 473 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 474 { 475 static const struct { 476 rpc_authflavor_t flavour; 477 const char *str; 478 } sec_flavours[] = { 479 { RPC_AUTH_NULL, "null" }, 480 { RPC_AUTH_UNIX, "sys" }, 481 { RPC_AUTH_GSS_KRB5, "krb5" }, 482 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 483 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 484 { RPC_AUTH_GSS_LKEY, "lkey" }, 485 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 486 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 487 { RPC_AUTH_GSS_SPKM, "spkm" }, 488 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 489 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 490 { UINT_MAX, "unknown" } 491 }; 492 int i; 493 494 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 495 if (sec_flavours[i].flavour == flavour) 496 break; 497 } 498 return sec_flavours[i].str; 499 } 500 501 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 502 int showdefaults) 503 { 504 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 505 506 seq_printf(m, ",mountproto="); 507 switch (sap->sa_family) { 508 case AF_INET: 509 switch (nfss->mountd_protocol) { 510 case IPPROTO_UDP: 511 seq_printf(m, RPCBIND_NETID_UDP); 512 break; 513 case IPPROTO_TCP: 514 seq_printf(m, RPCBIND_NETID_TCP); 515 break; 516 default: 517 if (showdefaults) 518 seq_printf(m, "auto"); 519 } 520 break; 521 case AF_INET6: 522 switch (nfss->mountd_protocol) { 523 case IPPROTO_UDP: 524 seq_printf(m, RPCBIND_NETID_UDP6); 525 break; 526 case IPPROTO_TCP: 527 seq_printf(m, RPCBIND_NETID_TCP6); 528 break; 529 default: 530 if (showdefaults) 531 seq_printf(m, "auto"); 532 } 533 break; 534 default: 535 if (showdefaults) 536 seq_printf(m, "auto"); 537 } 538 } 539 540 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 541 int showdefaults) 542 { 543 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 544 545 switch (sap->sa_family) { 546 case AF_INET: { 547 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 548 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 549 break; 550 } 551 case AF_INET6: { 552 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 553 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 554 break; 555 } 556 default: 557 if (showdefaults) 558 seq_printf(m, ",mountaddr=unspecified"); 559 } 560 561 if (nfss->mountd_version || showdefaults) 562 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 563 if (nfss->mountd_port || showdefaults) 564 seq_printf(m, ",mountport=%u", nfss->mountd_port); 565 566 nfs_show_mountd_netid(m, nfss, showdefaults); 567 } 568 569 /* 570 * Describe the mount options in force on this server representation 571 */ 572 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 573 int showdefaults) 574 { 575 static const struct proc_nfs_info { 576 int flag; 577 const char *str; 578 const char *nostr; 579 } nfs_info[] = { 580 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 581 { NFS_MOUNT_POSIX, ",posix", "" }, 582 { NFS_MOUNT_NOCTO, ",nocto", "" }, 583 { NFS_MOUNT_NOAC, ",noac", "" }, 584 { NFS_MOUNT_NONLM, ",nolock", "" }, 585 { NFS_MOUNT_NOACL, ",noacl", "" }, 586 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 587 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 588 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 589 { 0, NULL, NULL } 590 }; 591 const struct proc_nfs_info *nfs_infop; 592 struct nfs_client *clp = nfss->nfs_client; 593 u32 version = clp->rpc_ops->version; 594 595 seq_printf(m, ",vers=%u", version); 596 seq_printf(m, ",rsize=%u", nfss->rsize); 597 seq_printf(m, ",wsize=%u", nfss->wsize); 598 if (nfss->bsize != 0) 599 seq_printf(m, ",bsize=%u", nfss->bsize); 600 seq_printf(m, ",namlen=%u", nfss->namelen); 601 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 602 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 603 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 604 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 605 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 606 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 607 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 608 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 609 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 610 if (nfss->flags & nfs_infop->flag) 611 seq_puts(m, nfs_infop->str); 612 else 613 seq_puts(m, nfs_infop->nostr); 614 } 615 seq_printf(m, ",proto=%s", 616 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 617 if (version == 4) { 618 if (nfss->port != NFS_PORT) 619 seq_printf(m, ",port=%u", nfss->port); 620 } else 621 if (nfss->port) 622 seq_printf(m, ",port=%u", nfss->port); 623 624 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 625 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 626 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 627 628 if (version != 4) 629 nfs_show_mountd_options(m, nfss, showdefaults); 630 631 #ifdef CONFIG_NFS_V4 632 if (clp->rpc_ops->version == 4) 633 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 634 #endif 635 if (nfss->options & NFS_OPTION_FSCACHE) 636 seq_printf(m, ",fsc"); 637 } 638 639 /* 640 * Describe the mount options on this VFS mountpoint 641 */ 642 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 643 { 644 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 645 646 nfs_show_mount_options(m, nfss, 0); 647 648 seq_printf(m, ",addr=%s", 649 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 650 RPC_DISPLAY_ADDR)); 651 652 return 0; 653 } 654 655 /* 656 * Present statistical information for this VFS mountpoint 657 */ 658 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 659 { 660 int i, cpu; 661 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 662 struct rpc_auth *auth = nfss->client->cl_auth; 663 struct nfs_iostats totals = { }; 664 665 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 666 667 /* 668 * Display all mount option settings 669 */ 670 seq_printf(m, "\n\topts:\t"); 671 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 672 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 673 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 674 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 675 nfs_show_mount_options(m, nfss, 1); 676 677 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 678 679 seq_printf(m, "\n\tcaps:\t"); 680 seq_printf(m, "caps=0x%x", nfss->caps); 681 seq_printf(m, ",wtmult=%u", nfss->wtmult); 682 seq_printf(m, ",dtsize=%u", nfss->dtsize); 683 seq_printf(m, ",bsize=%u", nfss->bsize); 684 seq_printf(m, ",namlen=%u", nfss->namelen); 685 686 #ifdef CONFIG_NFS_V4 687 if (nfss->nfs_client->rpc_ops->version == 4) { 688 seq_printf(m, "\n\tnfsv4:\t"); 689 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 690 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 691 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 692 } 693 #endif 694 695 /* 696 * Display security flavor in effect for this mount 697 */ 698 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 699 if (auth->au_flavor) 700 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 701 702 /* 703 * Display superblock I/O counters 704 */ 705 for_each_possible_cpu(cpu) { 706 struct nfs_iostats *stats; 707 708 preempt_disable(); 709 stats = per_cpu_ptr(nfss->io_stats, cpu); 710 711 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 712 totals.events[i] += stats->events[i]; 713 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 714 totals.bytes[i] += stats->bytes[i]; 715 #ifdef CONFIG_NFS_FSCACHE 716 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 717 totals.fscache[i] += stats->fscache[i]; 718 #endif 719 720 preempt_enable(); 721 } 722 723 seq_printf(m, "\n\tevents:\t"); 724 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 725 seq_printf(m, "%lu ", totals.events[i]); 726 seq_printf(m, "\n\tbytes:\t"); 727 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 728 seq_printf(m, "%Lu ", totals.bytes[i]); 729 #ifdef CONFIG_NFS_FSCACHE 730 if (nfss->options & NFS_OPTION_FSCACHE) { 731 seq_printf(m, "\n\tfsc:\t"); 732 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 733 seq_printf(m, "%Lu ", totals.bytes[i]); 734 } 735 #endif 736 seq_printf(m, "\n"); 737 738 rpc_print_iostats(m, nfss->client); 739 740 return 0; 741 } 742 743 /* 744 * Begin unmount by attempting to remove all automounted mountpoints we added 745 * in response to xdev traversals and referrals 746 */ 747 static void nfs_umount_begin(struct super_block *sb) 748 { 749 struct nfs_server *server; 750 struct rpc_clnt *rpc; 751 752 server = NFS_SB(sb); 753 /* -EIO all pending I/O */ 754 rpc = server->client_acl; 755 if (!IS_ERR(rpc)) 756 rpc_killall_tasks(rpc); 757 rpc = server->client; 758 if (!IS_ERR(rpc)) 759 rpc_killall_tasks(rpc); 760 } 761 762 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 763 { 764 struct nfs_parsed_mount_data *data; 765 766 data = kzalloc(sizeof(*data), GFP_KERNEL); 767 if (data) { 768 data->acregmin = NFS_DEF_ACREGMIN; 769 data->acregmax = NFS_DEF_ACREGMAX; 770 data->acdirmin = NFS_DEF_ACDIRMIN; 771 data->acdirmax = NFS_DEF_ACDIRMAX; 772 data->mount_server.port = NFS_UNSPEC_PORT; 773 data->nfs_server.port = NFS_UNSPEC_PORT; 774 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 775 data->auth_flavors[0] = RPC_AUTH_UNIX; 776 data->auth_flavor_len = 1; 777 data->version = version; 778 data->minorversion = 0; 779 } 780 return data; 781 } 782 783 /* 784 * Sanity-check a server address provided by the mount command. 785 * 786 * Address family must be initialized, and address must not be 787 * the ANY address for that family. 788 */ 789 static int nfs_verify_server_address(struct sockaddr *addr) 790 { 791 switch (addr->sa_family) { 792 case AF_INET: { 793 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 794 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 795 } 796 case AF_INET6: { 797 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 798 return !ipv6_addr_any(sa); 799 } 800 } 801 802 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 803 return 0; 804 } 805 806 /* 807 * Select between a default port value and a user-specified port value. 808 * If a zero value is set, then autobind will be used. 809 */ 810 static void nfs_set_port(struct sockaddr *sap, int *port, 811 const unsigned short default_port) 812 { 813 if (*port == NFS_UNSPEC_PORT) 814 *port = default_port; 815 816 rpc_set_port(sap, *port); 817 } 818 819 /* 820 * Sanity check the NFS transport protocol. 821 * 822 */ 823 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 824 { 825 switch (mnt->nfs_server.protocol) { 826 case XPRT_TRANSPORT_UDP: 827 case XPRT_TRANSPORT_TCP: 828 case XPRT_TRANSPORT_RDMA: 829 break; 830 default: 831 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 832 } 833 } 834 835 /* 836 * For text based NFSv2/v3 mounts, the mount protocol transport default 837 * settings should depend upon the specified NFS transport. 838 */ 839 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 840 { 841 nfs_validate_transport_protocol(mnt); 842 843 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 844 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 845 return; 846 switch (mnt->nfs_server.protocol) { 847 case XPRT_TRANSPORT_UDP: 848 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 849 break; 850 case XPRT_TRANSPORT_TCP: 851 case XPRT_TRANSPORT_RDMA: 852 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 853 } 854 } 855 856 /* 857 * Parse the value of the 'sec=' option. 858 */ 859 static int nfs_parse_security_flavors(char *value, 860 struct nfs_parsed_mount_data *mnt) 861 { 862 substring_t args[MAX_OPT_ARGS]; 863 864 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 865 866 switch (match_token(value, nfs_secflavor_tokens, args)) { 867 case Opt_sec_none: 868 mnt->auth_flavors[0] = RPC_AUTH_NULL; 869 break; 870 case Opt_sec_sys: 871 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 872 break; 873 case Opt_sec_krb5: 874 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 875 break; 876 case Opt_sec_krb5i: 877 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 878 break; 879 case Opt_sec_krb5p: 880 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 881 break; 882 case Opt_sec_lkey: 883 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 884 break; 885 case Opt_sec_lkeyi: 886 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 887 break; 888 case Opt_sec_lkeyp: 889 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 890 break; 891 case Opt_sec_spkm: 892 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 893 break; 894 case Opt_sec_spkmi: 895 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 896 break; 897 case Opt_sec_spkmp: 898 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 899 break; 900 default: 901 return 0; 902 } 903 904 mnt->auth_flavor_len = 1; 905 return 1; 906 } 907 908 /* 909 * Error-check and convert a string of mount options from user space into 910 * a data structure. The whole mount string is processed; bad options are 911 * skipped as they are encountered. If there were no errors, return 1; 912 * otherwise return 0 (zero). 913 */ 914 static int nfs_parse_mount_options(char *raw, 915 struct nfs_parsed_mount_data *mnt) 916 { 917 char *p, *string, *secdata; 918 int rc, sloppy = 0, invalid_option = 0; 919 unsigned short protofamily = AF_UNSPEC; 920 unsigned short mountfamily = AF_UNSPEC; 921 922 if (!raw) { 923 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 924 return 1; 925 } 926 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 927 928 secdata = alloc_secdata(); 929 if (!secdata) 930 goto out_nomem; 931 932 rc = security_sb_copy_data(raw, secdata); 933 if (rc) 934 goto out_security_failure; 935 936 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 937 if (rc) 938 goto out_security_failure; 939 940 free_secdata(secdata); 941 942 while ((p = strsep(&raw, ",")) != NULL) { 943 substring_t args[MAX_OPT_ARGS]; 944 unsigned long option; 945 int token; 946 947 if (!*p) 948 continue; 949 950 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 951 952 token = match_token(p, nfs_mount_option_tokens, args); 953 switch (token) { 954 955 /* 956 * boolean options: foo/nofoo 957 */ 958 case Opt_soft: 959 mnt->flags |= NFS_MOUNT_SOFT; 960 break; 961 case Opt_hard: 962 mnt->flags &= ~NFS_MOUNT_SOFT; 963 break; 964 case Opt_posix: 965 mnt->flags |= NFS_MOUNT_POSIX; 966 break; 967 case Opt_noposix: 968 mnt->flags &= ~NFS_MOUNT_POSIX; 969 break; 970 case Opt_cto: 971 mnt->flags &= ~NFS_MOUNT_NOCTO; 972 break; 973 case Opt_nocto: 974 mnt->flags |= NFS_MOUNT_NOCTO; 975 break; 976 case Opt_ac: 977 mnt->flags &= ~NFS_MOUNT_NOAC; 978 break; 979 case Opt_noac: 980 mnt->flags |= NFS_MOUNT_NOAC; 981 break; 982 case Opt_lock: 983 mnt->flags &= ~NFS_MOUNT_NONLM; 984 break; 985 case Opt_nolock: 986 mnt->flags |= NFS_MOUNT_NONLM; 987 break; 988 case Opt_v2: 989 mnt->flags &= ~NFS_MOUNT_VER3; 990 mnt->version = 2; 991 break; 992 case Opt_v3: 993 mnt->flags |= NFS_MOUNT_VER3; 994 mnt->version = 3; 995 break; 996 #ifdef CONFIG_NFS_V4 997 case Opt_v4: 998 mnt->flags &= ~NFS_MOUNT_VER3; 999 mnt->version = 4; 1000 break; 1001 #endif 1002 case Opt_udp: 1003 mnt->flags &= ~NFS_MOUNT_TCP; 1004 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1005 break; 1006 case Opt_tcp: 1007 mnt->flags |= NFS_MOUNT_TCP; 1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1009 break; 1010 case Opt_rdma: 1011 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1013 xprt_load_transport(p); 1014 break; 1015 case Opt_acl: 1016 mnt->flags &= ~NFS_MOUNT_NOACL; 1017 break; 1018 case Opt_noacl: 1019 mnt->flags |= NFS_MOUNT_NOACL; 1020 break; 1021 case Opt_rdirplus: 1022 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1023 break; 1024 case Opt_nordirplus: 1025 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1026 break; 1027 case Opt_sharecache: 1028 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1029 break; 1030 case Opt_nosharecache: 1031 mnt->flags |= NFS_MOUNT_UNSHARED; 1032 break; 1033 case Opt_resvport: 1034 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1035 break; 1036 case Opt_noresvport: 1037 mnt->flags |= NFS_MOUNT_NORESVPORT; 1038 break; 1039 case Opt_fscache: 1040 mnt->options |= NFS_OPTION_FSCACHE; 1041 kfree(mnt->fscache_uniq); 1042 mnt->fscache_uniq = NULL; 1043 break; 1044 case Opt_nofscache: 1045 mnt->options &= ~NFS_OPTION_FSCACHE; 1046 kfree(mnt->fscache_uniq); 1047 mnt->fscache_uniq = NULL; 1048 break; 1049 case Opt_fscache_uniq: 1050 string = match_strdup(args); 1051 if (!string) 1052 goto out_nomem; 1053 kfree(mnt->fscache_uniq); 1054 mnt->fscache_uniq = string; 1055 mnt->options |= NFS_OPTION_FSCACHE; 1056 break; 1057 1058 /* 1059 * options that take numeric values 1060 */ 1061 case Opt_port: 1062 string = match_strdup(args); 1063 if (string == NULL) 1064 goto out_nomem; 1065 rc = strict_strtoul(string, 10, &option); 1066 kfree(string); 1067 if (rc != 0 || option > USHORT_MAX) 1068 goto out_invalid_value; 1069 mnt->nfs_server.port = option; 1070 break; 1071 case Opt_rsize: 1072 string = match_strdup(args); 1073 if (string == NULL) 1074 goto out_nomem; 1075 rc = strict_strtoul(string, 10, &option); 1076 kfree(string); 1077 if (rc != 0) 1078 goto out_invalid_value; 1079 mnt->rsize = option; 1080 break; 1081 case Opt_wsize: 1082 string = match_strdup(args); 1083 if (string == NULL) 1084 goto out_nomem; 1085 rc = strict_strtoul(string, 10, &option); 1086 kfree(string); 1087 if (rc != 0) 1088 goto out_invalid_value; 1089 mnt->wsize = option; 1090 break; 1091 case Opt_bsize: 1092 string = match_strdup(args); 1093 if (string == NULL) 1094 goto out_nomem; 1095 rc = strict_strtoul(string, 10, &option); 1096 kfree(string); 1097 if (rc != 0) 1098 goto out_invalid_value; 1099 mnt->bsize = option; 1100 break; 1101 case Opt_timeo: 1102 string = match_strdup(args); 1103 if (string == NULL) 1104 goto out_nomem; 1105 rc = strict_strtoul(string, 10, &option); 1106 kfree(string); 1107 if (rc != 0 || option == 0) 1108 goto out_invalid_value; 1109 mnt->timeo = option; 1110 break; 1111 case Opt_retrans: 1112 string = match_strdup(args); 1113 if (string == NULL) 1114 goto out_nomem; 1115 rc = strict_strtoul(string, 10, &option); 1116 kfree(string); 1117 if (rc != 0 || option == 0) 1118 goto out_invalid_value; 1119 mnt->retrans = option; 1120 break; 1121 case Opt_acregmin: 1122 string = match_strdup(args); 1123 if (string == NULL) 1124 goto out_nomem; 1125 rc = strict_strtoul(string, 10, &option); 1126 kfree(string); 1127 if (rc != 0) 1128 goto out_invalid_value; 1129 mnt->acregmin = option; 1130 break; 1131 case Opt_acregmax: 1132 string = match_strdup(args); 1133 if (string == NULL) 1134 goto out_nomem; 1135 rc = strict_strtoul(string, 10, &option); 1136 kfree(string); 1137 if (rc != 0) 1138 goto out_invalid_value; 1139 mnt->acregmax = option; 1140 break; 1141 case Opt_acdirmin: 1142 string = match_strdup(args); 1143 if (string == NULL) 1144 goto out_nomem; 1145 rc = strict_strtoul(string, 10, &option); 1146 kfree(string); 1147 if (rc != 0) 1148 goto out_invalid_value; 1149 mnt->acdirmin = option; 1150 break; 1151 case Opt_acdirmax: 1152 string = match_strdup(args); 1153 if (string == NULL) 1154 goto out_nomem; 1155 rc = strict_strtoul(string, 10, &option); 1156 kfree(string); 1157 if (rc != 0) 1158 goto out_invalid_value; 1159 mnt->acdirmax = option; 1160 break; 1161 case Opt_actimeo: 1162 string = match_strdup(args); 1163 if (string == NULL) 1164 goto out_nomem; 1165 rc = strict_strtoul(string, 10, &option); 1166 kfree(string); 1167 if (rc != 0) 1168 goto out_invalid_value; 1169 mnt->acregmin = mnt->acregmax = 1170 mnt->acdirmin = mnt->acdirmax = option; 1171 break; 1172 case Opt_namelen: 1173 string = match_strdup(args); 1174 if (string == NULL) 1175 goto out_nomem; 1176 rc = strict_strtoul(string, 10, &option); 1177 kfree(string); 1178 if (rc != 0) 1179 goto out_invalid_value; 1180 mnt->namlen = option; 1181 break; 1182 case Opt_mountport: 1183 string = match_strdup(args); 1184 if (string == NULL) 1185 goto out_nomem; 1186 rc = strict_strtoul(string, 10, &option); 1187 kfree(string); 1188 if (rc != 0 || option > USHORT_MAX) 1189 goto out_invalid_value; 1190 mnt->mount_server.port = option; 1191 break; 1192 case Opt_mountvers: 1193 string = match_strdup(args); 1194 if (string == NULL) 1195 goto out_nomem; 1196 rc = strict_strtoul(string, 10, &option); 1197 kfree(string); 1198 if (rc != 0 || 1199 option < NFS_MNT_VERSION || 1200 option > NFS_MNT3_VERSION) 1201 goto out_invalid_value; 1202 mnt->mount_server.version = option; 1203 break; 1204 case Opt_nfsvers: 1205 string = match_strdup(args); 1206 if (string == NULL) 1207 goto out_nomem; 1208 rc = strict_strtoul(string, 10, &option); 1209 kfree(string); 1210 if (rc != 0) 1211 goto out_invalid_value; 1212 switch (option) { 1213 case NFS2_VERSION: 1214 mnt->flags &= ~NFS_MOUNT_VER3; 1215 mnt->version = 2; 1216 break; 1217 case NFS3_VERSION: 1218 mnt->flags |= NFS_MOUNT_VER3; 1219 mnt->version = 3; 1220 break; 1221 #ifdef CONFIG_NFS_V4 1222 case NFS4_VERSION: 1223 mnt->flags &= ~NFS_MOUNT_VER3; 1224 mnt->version = 4; 1225 break; 1226 #endif 1227 default: 1228 goto out_invalid_value; 1229 } 1230 break; 1231 case Opt_minorversion: 1232 string = match_strdup(args); 1233 if (string == NULL) 1234 goto out_nomem; 1235 rc = strict_strtoul(string, 10, &option); 1236 kfree(string); 1237 if (rc != 0) 1238 goto out_invalid_value; 1239 if (option > NFS4_MAX_MINOR_VERSION) 1240 goto out_invalid_value; 1241 mnt->minorversion = option; 1242 break; 1243 1244 /* 1245 * options that take text values 1246 */ 1247 case Opt_sec: 1248 string = match_strdup(args); 1249 if (string == NULL) 1250 goto out_nomem; 1251 rc = nfs_parse_security_flavors(string, mnt); 1252 kfree(string); 1253 if (!rc) { 1254 dfprintk(MOUNT, "NFS: unrecognized " 1255 "security flavor\n"); 1256 return 0; 1257 } 1258 break; 1259 case Opt_proto: 1260 string = match_strdup(args); 1261 if (string == NULL) 1262 goto out_nomem; 1263 token = match_token(string, 1264 nfs_xprt_protocol_tokens, args); 1265 1266 protofamily = AF_INET; 1267 switch (token) { 1268 case Opt_xprt_udp6: 1269 protofamily = AF_INET6; 1270 case Opt_xprt_udp: 1271 mnt->flags &= ~NFS_MOUNT_TCP; 1272 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1273 kfree(string); 1274 break; 1275 case Opt_xprt_tcp6: 1276 protofamily = AF_INET6; 1277 case Opt_xprt_tcp: 1278 mnt->flags |= NFS_MOUNT_TCP; 1279 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1280 kfree(string); 1281 break; 1282 case Opt_xprt_rdma: 1283 /* vector side protocols to TCP */ 1284 mnt->flags |= NFS_MOUNT_TCP; 1285 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1286 xprt_load_transport(string); 1287 kfree(string); 1288 break; 1289 default: 1290 dfprintk(MOUNT, "NFS: unrecognized " 1291 "transport protocol\n"); 1292 kfree(string); 1293 return 0; 1294 } 1295 break; 1296 case Opt_mountproto: 1297 string = match_strdup(args); 1298 if (string == NULL) 1299 goto out_nomem; 1300 token = match_token(string, 1301 nfs_xprt_protocol_tokens, args); 1302 kfree(string); 1303 1304 mountfamily = AF_INET; 1305 switch (token) { 1306 case Opt_xprt_udp6: 1307 mountfamily = AF_INET6; 1308 case Opt_xprt_udp: 1309 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1310 break; 1311 case Opt_xprt_tcp6: 1312 mountfamily = AF_INET6; 1313 case Opt_xprt_tcp: 1314 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1315 break; 1316 case Opt_xprt_rdma: /* not used for side protocols */ 1317 default: 1318 dfprintk(MOUNT, "NFS: unrecognized " 1319 "transport protocol\n"); 1320 return 0; 1321 } 1322 break; 1323 case Opt_addr: 1324 string = match_strdup(args); 1325 if (string == NULL) 1326 goto out_nomem; 1327 mnt->nfs_server.addrlen = 1328 rpc_pton(string, strlen(string), 1329 (struct sockaddr *) 1330 &mnt->nfs_server.address, 1331 sizeof(mnt->nfs_server.address)); 1332 kfree(string); 1333 if (mnt->nfs_server.addrlen == 0) 1334 goto out_invalid_address; 1335 break; 1336 case Opt_clientaddr: 1337 string = match_strdup(args); 1338 if (string == NULL) 1339 goto out_nomem; 1340 kfree(mnt->client_address); 1341 mnt->client_address = string; 1342 break; 1343 case Opt_mounthost: 1344 string = match_strdup(args); 1345 if (string == NULL) 1346 goto out_nomem; 1347 kfree(mnt->mount_server.hostname); 1348 mnt->mount_server.hostname = string; 1349 break; 1350 case Opt_mountaddr: 1351 string = match_strdup(args); 1352 if (string == NULL) 1353 goto out_nomem; 1354 mnt->mount_server.addrlen = 1355 rpc_pton(string, strlen(string), 1356 (struct sockaddr *) 1357 &mnt->mount_server.address, 1358 sizeof(mnt->mount_server.address)); 1359 kfree(string); 1360 if (mnt->mount_server.addrlen == 0) 1361 goto out_invalid_address; 1362 break; 1363 case Opt_lookupcache: 1364 string = match_strdup(args); 1365 if (string == NULL) 1366 goto out_nomem; 1367 token = match_token(string, 1368 nfs_lookupcache_tokens, args); 1369 kfree(string); 1370 switch (token) { 1371 case Opt_lookupcache_all: 1372 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1373 break; 1374 case Opt_lookupcache_positive: 1375 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1376 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1377 break; 1378 case Opt_lookupcache_none: 1379 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1380 break; 1381 default: 1382 dfprintk(MOUNT, "NFS: invalid " 1383 "lookupcache argument\n"); 1384 return 0; 1385 }; 1386 break; 1387 1388 /* 1389 * Special options 1390 */ 1391 case Opt_sloppy: 1392 sloppy = 1; 1393 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1394 break; 1395 case Opt_userspace: 1396 case Opt_deprecated: 1397 dfprintk(MOUNT, "NFS: ignoring mount option " 1398 "'%s'\n", p); 1399 break; 1400 1401 default: 1402 invalid_option = 1; 1403 dfprintk(MOUNT, "NFS: unrecognized mount option " 1404 "'%s'\n", p); 1405 } 1406 } 1407 1408 if (!sloppy && invalid_option) 1409 return 0; 1410 1411 /* 1412 * verify that any proto=/mountproto= options match the address 1413 * familiies in the addr=/mountaddr= options. 1414 */ 1415 if (protofamily != AF_UNSPEC && 1416 protofamily != mnt->nfs_server.address.ss_family) 1417 goto out_proto_mismatch; 1418 1419 if (mountfamily != AF_UNSPEC) { 1420 if (mnt->mount_server.addrlen) { 1421 if (mountfamily != mnt->mount_server.address.ss_family) 1422 goto out_mountproto_mismatch; 1423 } else { 1424 if (mountfamily != mnt->nfs_server.address.ss_family) 1425 goto out_mountproto_mismatch; 1426 } 1427 } 1428 1429 return 1; 1430 1431 out_mountproto_mismatch: 1432 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1433 "option\n"); 1434 return 0; 1435 out_proto_mismatch: 1436 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1437 return 0; 1438 out_invalid_address: 1439 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1440 return 0; 1441 out_invalid_value: 1442 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1443 return 0; 1444 out_nomem: 1445 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1446 return 0; 1447 out_security_failure: 1448 free_secdata(secdata); 1449 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1450 return 0; 1451 } 1452 1453 /* 1454 * Match the requested auth flavors with the list returned by 1455 * the server. Returns zero and sets the mount's authentication 1456 * flavor on success; returns -EACCES if server does not support 1457 * the requested flavor. 1458 */ 1459 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1460 struct nfs_mount_request *request) 1461 { 1462 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1463 1464 /* 1465 * Certain releases of Linux's mountd return an empty 1466 * flavor list. To prevent behavioral regression with 1467 * these servers (ie. rejecting mounts that used to 1468 * succeed), revert to pre-2.6.32 behavior (no checking) 1469 * if the returned flavor list is empty. 1470 */ 1471 if (server_authlist_len == 0) 1472 return 0; 1473 1474 /* 1475 * We avoid sophisticated negotiating here, as there are 1476 * plenty of cases where we can get it wrong, providing 1477 * either too little or too much security. 1478 * 1479 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1480 * flavor listed first. However, some servers list 1481 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1482 * preferred default, in args->auth_flavors[0] if user 1483 * didn't specify sec= mount option. 1484 */ 1485 for (i = 0; i < args->auth_flavor_len; i++) 1486 for (j = 0; j < server_authlist_len; j++) 1487 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1488 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1489 request->auth_flavs[j]); 1490 args->auth_flavors[0] = request->auth_flavs[j]; 1491 return 0; 1492 } 1493 1494 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1495 nfs_umount(request); 1496 return -EACCES; 1497 } 1498 1499 /* 1500 * Use the remote server's MOUNT service to request the NFS file handle 1501 * corresponding to the provided path. 1502 */ 1503 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1504 struct nfs_fh *root_fh) 1505 { 1506 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1507 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1508 struct nfs_mount_request request = { 1509 .sap = (struct sockaddr *) 1510 &args->mount_server.address, 1511 .dirpath = args->nfs_server.export_path, 1512 .protocol = args->mount_server.protocol, 1513 .fh = root_fh, 1514 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1515 .auth_flav_len = &server_authlist_len, 1516 .auth_flavs = server_authlist, 1517 }; 1518 int status; 1519 1520 if (args->mount_server.version == 0) { 1521 switch (args->version) { 1522 default: 1523 args->mount_server.version = NFS_MNT3_VERSION; 1524 break; 1525 case 2: 1526 args->mount_server.version = NFS_MNT_VERSION; 1527 } 1528 } 1529 request.version = args->mount_server.version; 1530 1531 if (args->mount_server.hostname) 1532 request.hostname = args->mount_server.hostname; 1533 else 1534 request.hostname = args->nfs_server.hostname; 1535 1536 /* 1537 * Construct the mount server's address. 1538 */ 1539 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1540 memcpy(request.sap, &args->nfs_server.address, 1541 args->nfs_server.addrlen); 1542 args->mount_server.addrlen = args->nfs_server.addrlen; 1543 } 1544 request.salen = args->mount_server.addrlen; 1545 nfs_set_port(request.sap, &args->mount_server.port, 0); 1546 1547 /* 1548 * Now ask the mount server to map our export path 1549 * to a file handle. 1550 */ 1551 status = nfs_mount(&request); 1552 if (status != 0) { 1553 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1554 request.hostname, status); 1555 return status; 1556 } 1557 1558 /* 1559 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1560 */ 1561 if (args->mount_server.version != NFS_MNT3_VERSION) 1562 return 0; 1563 return nfs_walk_authlist(args, &request); 1564 } 1565 1566 static int nfs_parse_simple_hostname(const char *dev_name, 1567 char **hostname, size_t maxnamlen, 1568 char **export_path, size_t maxpathlen) 1569 { 1570 size_t len; 1571 char *colon, *comma; 1572 1573 colon = strchr(dev_name, ':'); 1574 if (colon == NULL) 1575 goto out_bad_devname; 1576 1577 len = colon - dev_name; 1578 if (len > maxnamlen) 1579 goto out_hostname; 1580 1581 /* N.B. caller will free nfs_server.hostname in all cases */ 1582 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1583 if (!*hostname) 1584 goto out_nomem; 1585 1586 /* kill possible hostname list: not supported */ 1587 comma = strchr(*hostname, ','); 1588 if (comma != NULL) { 1589 if (comma == *hostname) 1590 goto out_bad_devname; 1591 *comma = '\0'; 1592 } 1593 1594 colon++; 1595 len = strlen(colon); 1596 if (len > maxpathlen) 1597 goto out_path; 1598 *export_path = kstrndup(colon, len, GFP_KERNEL); 1599 if (!*export_path) 1600 goto out_nomem; 1601 1602 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1603 return 0; 1604 1605 out_bad_devname: 1606 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1607 return -EINVAL; 1608 1609 out_nomem: 1610 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1611 return -ENOMEM; 1612 1613 out_hostname: 1614 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1615 return -ENAMETOOLONG; 1616 1617 out_path: 1618 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1619 return -ENAMETOOLONG; 1620 } 1621 1622 /* 1623 * Hostname has square brackets around it because it contains one or 1624 * more colons. We look for the first closing square bracket, and a 1625 * colon must follow it. 1626 */ 1627 static int nfs_parse_protected_hostname(const char *dev_name, 1628 char **hostname, size_t maxnamlen, 1629 char **export_path, size_t maxpathlen) 1630 { 1631 size_t len; 1632 char *start, *end; 1633 1634 start = (char *)(dev_name + 1); 1635 1636 end = strchr(start, ']'); 1637 if (end == NULL) 1638 goto out_bad_devname; 1639 if (*(end + 1) != ':') 1640 goto out_bad_devname; 1641 1642 len = end - start; 1643 if (len > maxnamlen) 1644 goto out_hostname; 1645 1646 /* N.B. caller will free nfs_server.hostname in all cases */ 1647 *hostname = kstrndup(start, len, GFP_KERNEL); 1648 if (*hostname == NULL) 1649 goto out_nomem; 1650 1651 end += 2; 1652 len = strlen(end); 1653 if (len > maxpathlen) 1654 goto out_path; 1655 *export_path = kstrndup(end, len, GFP_KERNEL); 1656 if (!*export_path) 1657 goto out_nomem; 1658 1659 return 0; 1660 1661 out_bad_devname: 1662 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1663 return -EINVAL; 1664 1665 out_nomem: 1666 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1667 return -ENOMEM; 1668 1669 out_hostname: 1670 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1671 return -ENAMETOOLONG; 1672 1673 out_path: 1674 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1675 return -ENAMETOOLONG; 1676 } 1677 1678 /* 1679 * Split "dev_name" into "hostname:export_path". 1680 * 1681 * The leftmost colon demarks the split between the server's hostname 1682 * and the export path. If the hostname starts with a left square 1683 * bracket, then it may contain colons. 1684 * 1685 * Note: caller frees hostname and export path, even on error. 1686 */ 1687 static int nfs_parse_devname(const char *dev_name, 1688 char **hostname, size_t maxnamlen, 1689 char **export_path, size_t maxpathlen) 1690 { 1691 if (*dev_name == '[') 1692 return nfs_parse_protected_hostname(dev_name, 1693 hostname, maxnamlen, 1694 export_path, maxpathlen); 1695 1696 return nfs_parse_simple_hostname(dev_name, 1697 hostname, maxnamlen, 1698 export_path, maxpathlen); 1699 } 1700 1701 /* 1702 * Validate the NFS2/NFS3 mount data 1703 * - fills in the mount root filehandle 1704 * 1705 * For option strings, user space handles the following behaviors: 1706 * 1707 * + DNS: mapping server host name to IP address ("addr=" option) 1708 * 1709 * + failure mode: how to behave if a mount request can't be handled 1710 * immediately ("fg/bg" option) 1711 * 1712 * + retry: how often to retry a mount request ("retry=" option) 1713 * 1714 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1715 * mountproto=tcp after mountproto=udp, and so on 1716 */ 1717 static int nfs_validate_mount_data(void *options, 1718 struct nfs_parsed_mount_data *args, 1719 struct nfs_fh *mntfh, 1720 const char *dev_name) 1721 { 1722 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1723 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1724 1725 if (data == NULL) 1726 goto out_no_data; 1727 1728 switch (data->version) { 1729 case 1: 1730 data->namlen = 0; 1731 case 2: 1732 data->bsize = 0; 1733 case 3: 1734 if (data->flags & NFS_MOUNT_VER3) 1735 goto out_no_v3; 1736 data->root.size = NFS2_FHSIZE; 1737 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1738 case 4: 1739 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1740 goto out_no_sec; 1741 case 5: 1742 memset(data->context, 0, sizeof(data->context)); 1743 case 6: 1744 if (data->flags & NFS_MOUNT_VER3) { 1745 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1746 goto out_invalid_fh; 1747 mntfh->size = data->root.size; 1748 args->version = 3; 1749 } else { 1750 mntfh->size = NFS2_FHSIZE; 1751 args->version = 2; 1752 } 1753 1754 1755 memcpy(mntfh->data, data->root.data, mntfh->size); 1756 if (mntfh->size < sizeof(mntfh->data)) 1757 memset(mntfh->data + mntfh->size, 0, 1758 sizeof(mntfh->data) - mntfh->size); 1759 1760 /* 1761 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1762 * can deal with. 1763 */ 1764 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1765 args->rsize = data->rsize; 1766 args->wsize = data->wsize; 1767 args->timeo = data->timeo; 1768 args->retrans = data->retrans; 1769 args->acregmin = data->acregmin; 1770 args->acregmax = data->acregmax; 1771 args->acdirmin = data->acdirmin; 1772 args->acdirmax = data->acdirmax; 1773 1774 memcpy(sap, &data->addr, sizeof(data->addr)); 1775 args->nfs_server.addrlen = sizeof(data->addr); 1776 if (!nfs_verify_server_address(sap)) 1777 goto out_no_address; 1778 1779 if (!(data->flags & NFS_MOUNT_TCP)) 1780 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1781 /* N.B. caller will free nfs_server.hostname in all cases */ 1782 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1783 args->namlen = data->namlen; 1784 args->bsize = data->bsize; 1785 1786 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1787 args->auth_flavors[0] = data->pseudoflavor; 1788 if (!args->nfs_server.hostname) 1789 goto out_nomem; 1790 1791 /* 1792 * The legacy version 6 binary mount data from userspace has a 1793 * field used only to transport selinux information into the 1794 * the kernel. To continue to support that functionality we 1795 * have a touch of selinux knowledge here in the NFS code. The 1796 * userspace code converted context=blah to just blah so we are 1797 * converting back to the full string selinux understands. 1798 */ 1799 if (data->context[0]){ 1800 #ifdef CONFIG_SECURITY_SELINUX 1801 int rc; 1802 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1803 if (!opts_str) 1804 return -ENOMEM; 1805 strcpy(opts_str, "context="); 1806 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1807 strcat(opts_str, &data->context[0]); 1808 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1809 kfree(opts_str); 1810 if (rc) 1811 return rc; 1812 #else 1813 return -EINVAL; 1814 #endif 1815 } 1816 1817 break; 1818 default: { 1819 int status; 1820 1821 if (nfs_parse_mount_options((char *)options, args) == 0) 1822 return -EINVAL; 1823 1824 if (!nfs_verify_server_address(sap)) 1825 goto out_no_address; 1826 1827 if (args->version == 4) 1828 #ifdef CONFIG_NFS_V4 1829 return nfs4_validate_text_mount_data(options, 1830 args, dev_name); 1831 #else 1832 goto out_v4_not_compiled; 1833 #endif 1834 1835 nfs_set_port(sap, &args->nfs_server.port, 0); 1836 1837 nfs_set_mount_transport_protocol(args); 1838 1839 status = nfs_parse_devname(dev_name, 1840 &args->nfs_server.hostname, 1841 PAGE_SIZE, 1842 &args->nfs_server.export_path, 1843 NFS_MAXPATHLEN); 1844 if (!status) 1845 status = nfs_try_mount(args, mntfh); 1846 1847 kfree(args->nfs_server.export_path); 1848 args->nfs_server.export_path = NULL; 1849 1850 if (status) 1851 return status; 1852 1853 break; 1854 } 1855 } 1856 1857 #ifndef CONFIG_NFS_V3 1858 if (args->version == 3) 1859 goto out_v3_not_compiled; 1860 #endif /* !CONFIG_NFS_V3 */ 1861 1862 return 0; 1863 1864 out_no_data: 1865 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1866 return -EINVAL; 1867 1868 out_no_v3: 1869 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1870 data->version); 1871 return -EINVAL; 1872 1873 out_no_sec: 1874 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1875 return -EINVAL; 1876 1877 #ifndef CONFIG_NFS_V3 1878 out_v3_not_compiled: 1879 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1880 return -EPROTONOSUPPORT; 1881 #endif /* !CONFIG_NFS_V3 */ 1882 1883 #ifndef CONFIG_NFS_V4 1884 out_v4_not_compiled: 1885 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1886 return -EPROTONOSUPPORT; 1887 #endif /* !CONFIG_NFS_V4 */ 1888 1889 out_nomem: 1890 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1891 return -ENOMEM; 1892 1893 out_no_address: 1894 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1895 return -EINVAL; 1896 1897 out_invalid_fh: 1898 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1899 return -EINVAL; 1900 } 1901 1902 static int 1903 nfs_compare_remount_data(struct nfs_server *nfss, 1904 struct nfs_parsed_mount_data *data) 1905 { 1906 if (data->flags != nfss->flags || 1907 data->rsize != nfss->rsize || 1908 data->wsize != nfss->wsize || 1909 data->retrans != nfss->client->cl_timeout->to_retries || 1910 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1911 data->acregmin != nfss->acregmin / HZ || 1912 data->acregmax != nfss->acregmax / HZ || 1913 data->acdirmin != nfss->acdirmin / HZ || 1914 data->acdirmax != nfss->acdirmax / HZ || 1915 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1916 data->nfs_server.port != nfss->port || 1917 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1918 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1919 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1920 return -EINVAL; 1921 1922 return 0; 1923 } 1924 1925 static int 1926 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1927 { 1928 int error; 1929 struct nfs_server *nfss = sb->s_fs_info; 1930 struct nfs_parsed_mount_data *data; 1931 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1932 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1933 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1934 1935 /* 1936 * Userspace mount programs that send binary options generally send 1937 * them populated with default values. We have no way to know which 1938 * ones were explicitly specified. Fall back to legacy behavior and 1939 * just return success. 1940 */ 1941 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1942 (nfsvers <= 3 && (!options || (options->version >= 1 && 1943 options->version <= 6)))) 1944 return 0; 1945 1946 data = kzalloc(sizeof(*data), GFP_KERNEL); 1947 if (data == NULL) 1948 return -ENOMEM; 1949 1950 /* fill out struct with values from existing mount */ 1951 data->flags = nfss->flags; 1952 data->rsize = nfss->rsize; 1953 data->wsize = nfss->wsize; 1954 data->retrans = nfss->client->cl_timeout->to_retries; 1955 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1956 data->acregmin = nfss->acregmin / HZ; 1957 data->acregmax = nfss->acregmax / HZ; 1958 data->acdirmin = nfss->acdirmin / HZ; 1959 data->acdirmax = nfss->acdirmax / HZ; 1960 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1961 data->nfs_server.port = nfss->port; 1962 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1963 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1964 data->nfs_server.addrlen); 1965 1966 /* overwrite those values with any that were specified */ 1967 error = nfs_parse_mount_options((char *)options, data); 1968 if (error < 0) 1969 goto out; 1970 1971 /* compare new mount options with old ones */ 1972 error = nfs_compare_remount_data(nfss, data); 1973 out: 1974 kfree(data); 1975 return error; 1976 } 1977 1978 /* 1979 * Initialise the common bits of the superblock 1980 */ 1981 static inline void nfs_initialise_sb(struct super_block *sb) 1982 { 1983 struct nfs_server *server = NFS_SB(sb); 1984 1985 sb->s_magic = NFS_SUPER_MAGIC; 1986 1987 /* We probably want something more informative here */ 1988 snprintf(sb->s_id, sizeof(sb->s_id), 1989 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1990 1991 if (sb->s_blocksize == 0) 1992 sb->s_blocksize = nfs_block_bits(server->wsize, 1993 &sb->s_blocksize_bits); 1994 1995 if (server->flags & NFS_MOUNT_NOAC) 1996 sb->s_flags |= MS_SYNCHRONOUS; 1997 1998 sb->s_bdi = &server->backing_dev_info; 1999 2000 nfs_super_set_maxbytes(sb, server->maxfilesize); 2001 } 2002 2003 /* 2004 * Finish setting up an NFS2/3 superblock 2005 */ 2006 static void nfs_fill_super(struct super_block *sb, 2007 struct nfs_parsed_mount_data *data) 2008 { 2009 struct nfs_server *server = NFS_SB(sb); 2010 2011 sb->s_blocksize_bits = 0; 2012 sb->s_blocksize = 0; 2013 if (data->bsize) 2014 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2015 2016 if (server->nfs_client->rpc_ops->version == 3) { 2017 /* The VFS shouldn't apply the umask to mode bits. We will do 2018 * so ourselves when necessary. 2019 */ 2020 sb->s_flags |= MS_POSIXACL; 2021 sb->s_time_gran = 1; 2022 } 2023 2024 sb->s_op = &nfs_sops; 2025 nfs_initialise_sb(sb); 2026 } 2027 2028 /* 2029 * Finish setting up a cloned NFS2/3 superblock 2030 */ 2031 static void nfs_clone_super(struct super_block *sb, 2032 const struct super_block *old_sb) 2033 { 2034 struct nfs_server *server = NFS_SB(sb); 2035 2036 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2037 sb->s_blocksize = old_sb->s_blocksize; 2038 sb->s_maxbytes = old_sb->s_maxbytes; 2039 2040 if (server->nfs_client->rpc_ops->version == 3) { 2041 /* The VFS shouldn't apply the umask to mode bits. We will do 2042 * so ourselves when necessary. 2043 */ 2044 sb->s_flags |= MS_POSIXACL; 2045 sb->s_time_gran = 1; 2046 } 2047 2048 sb->s_op = old_sb->s_op; 2049 nfs_initialise_sb(sb); 2050 } 2051 2052 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2053 { 2054 const struct nfs_server *a = s->s_fs_info; 2055 const struct rpc_clnt *clnt_a = a->client; 2056 const struct rpc_clnt *clnt_b = b->client; 2057 2058 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2059 goto Ebusy; 2060 if (a->nfs_client != b->nfs_client) 2061 goto Ebusy; 2062 if (a->flags != b->flags) 2063 goto Ebusy; 2064 if (a->wsize != b->wsize) 2065 goto Ebusy; 2066 if (a->rsize != b->rsize) 2067 goto Ebusy; 2068 if (a->acregmin != b->acregmin) 2069 goto Ebusy; 2070 if (a->acregmax != b->acregmax) 2071 goto Ebusy; 2072 if (a->acdirmin != b->acdirmin) 2073 goto Ebusy; 2074 if (a->acdirmax != b->acdirmax) 2075 goto Ebusy; 2076 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2077 goto Ebusy; 2078 return 1; 2079 Ebusy: 2080 return 0; 2081 } 2082 2083 struct nfs_sb_mountdata { 2084 struct nfs_server *server; 2085 int mntflags; 2086 }; 2087 2088 static int nfs_set_super(struct super_block *s, void *data) 2089 { 2090 struct nfs_sb_mountdata *sb_mntdata = data; 2091 struct nfs_server *server = sb_mntdata->server; 2092 int ret; 2093 2094 s->s_flags = sb_mntdata->mntflags; 2095 s->s_fs_info = server; 2096 ret = set_anon_super(s, server); 2097 if (ret == 0) 2098 server->s_dev = s->s_dev; 2099 return ret; 2100 } 2101 2102 static int nfs_compare_super_address(struct nfs_server *server1, 2103 struct nfs_server *server2) 2104 { 2105 struct sockaddr *sap1, *sap2; 2106 2107 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2108 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2109 2110 if (sap1->sa_family != sap2->sa_family) 2111 return 0; 2112 2113 switch (sap1->sa_family) { 2114 case AF_INET: { 2115 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2116 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2117 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2118 return 0; 2119 if (sin1->sin_port != sin2->sin_port) 2120 return 0; 2121 break; 2122 } 2123 case AF_INET6: { 2124 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2125 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2126 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2127 return 0; 2128 if (sin1->sin6_port != sin2->sin6_port) 2129 return 0; 2130 break; 2131 } 2132 default: 2133 return 0; 2134 } 2135 2136 return 1; 2137 } 2138 2139 static int nfs_compare_super(struct super_block *sb, void *data) 2140 { 2141 struct nfs_sb_mountdata *sb_mntdata = data; 2142 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2143 int mntflags = sb_mntdata->mntflags; 2144 2145 if (!nfs_compare_super_address(old, server)) 2146 return 0; 2147 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2148 if (old->flags & NFS_MOUNT_UNSHARED) 2149 return 0; 2150 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2151 return 0; 2152 return nfs_compare_mount_options(sb, server, mntflags); 2153 } 2154 2155 static int nfs_bdi_register(struct nfs_server *server) 2156 { 2157 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2158 } 2159 2160 static int nfs_get_sb(struct file_system_type *fs_type, 2161 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2162 { 2163 struct nfs_server *server = NULL; 2164 struct super_block *s; 2165 struct nfs_parsed_mount_data *data; 2166 struct nfs_fh *mntfh; 2167 struct dentry *mntroot; 2168 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2169 struct nfs_sb_mountdata sb_mntdata = { 2170 .mntflags = flags, 2171 }; 2172 int error = -ENOMEM; 2173 2174 data = nfs_alloc_parsed_mount_data(3); 2175 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2176 if (data == NULL || mntfh == NULL) 2177 goto out_free_fh; 2178 2179 security_init_mnt_opts(&data->lsm_opts); 2180 2181 /* Validate the mount data */ 2182 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2183 if (error < 0) 2184 goto out; 2185 2186 #ifdef CONFIG_NFS_V4 2187 if (data->version == 4) { 2188 error = nfs4_try_mount(flags, dev_name, data, mnt); 2189 kfree(data->client_address); 2190 goto out; 2191 } 2192 #endif /* CONFIG_NFS_V4 */ 2193 2194 /* Get a volume representation */ 2195 server = nfs_create_server(data, mntfh); 2196 if (IS_ERR(server)) { 2197 error = PTR_ERR(server); 2198 goto out; 2199 } 2200 sb_mntdata.server = server; 2201 2202 if (server->flags & NFS_MOUNT_UNSHARED) 2203 compare_super = NULL; 2204 2205 /* Get a superblock - note that we may end up sharing one that already exists */ 2206 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2207 if (IS_ERR(s)) { 2208 error = PTR_ERR(s); 2209 goto out_err_nosb; 2210 } 2211 2212 if (s->s_fs_info != server) { 2213 nfs_free_server(server); 2214 server = NULL; 2215 } else { 2216 error = nfs_bdi_register(server); 2217 if (error) 2218 goto error_splat_bdi; 2219 } 2220 2221 if (!s->s_root) { 2222 /* initial superblock/root creation */ 2223 nfs_fill_super(s, data); 2224 nfs_fscache_get_super_cookie( 2225 s, data ? data->fscache_uniq : NULL, NULL); 2226 } 2227 2228 mntroot = nfs_get_root(s, mntfh); 2229 if (IS_ERR(mntroot)) { 2230 error = PTR_ERR(mntroot); 2231 goto error_splat_super; 2232 } 2233 2234 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2235 if (error) 2236 goto error_splat_root; 2237 2238 s->s_flags |= MS_ACTIVE; 2239 mnt->mnt_sb = s; 2240 mnt->mnt_root = mntroot; 2241 error = 0; 2242 2243 out: 2244 kfree(data->nfs_server.hostname); 2245 kfree(data->mount_server.hostname); 2246 kfree(data->fscache_uniq); 2247 security_free_mnt_opts(&data->lsm_opts); 2248 out_free_fh: 2249 kfree(mntfh); 2250 kfree(data); 2251 return error; 2252 2253 out_err_nosb: 2254 nfs_free_server(server); 2255 goto out; 2256 2257 error_splat_root: 2258 dput(mntroot); 2259 error_splat_super: 2260 if (server && !s->s_root) 2261 bdi_unregister(&server->backing_dev_info); 2262 error_splat_bdi: 2263 deactivate_locked_super(s); 2264 goto out; 2265 } 2266 2267 /* 2268 * Ensure that we unregister the bdi before kill_anon_super 2269 * releases the device name 2270 */ 2271 static void nfs_put_super(struct super_block *s) 2272 { 2273 struct nfs_server *server = NFS_SB(s); 2274 2275 bdi_unregister(&server->backing_dev_info); 2276 } 2277 2278 /* 2279 * Destroy an NFS2/3 superblock 2280 */ 2281 static void nfs_kill_super(struct super_block *s) 2282 { 2283 struct nfs_server *server = NFS_SB(s); 2284 2285 kill_anon_super(s); 2286 nfs_fscache_release_super_cookie(s); 2287 nfs_free_server(server); 2288 } 2289 2290 /* 2291 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2292 */ 2293 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2294 const char *dev_name, void *raw_data, 2295 struct vfsmount *mnt) 2296 { 2297 struct nfs_clone_mount *data = raw_data; 2298 struct super_block *s; 2299 struct nfs_server *server; 2300 struct dentry *mntroot; 2301 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2302 struct nfs_sb_mountdata sb_mntdata = { 2303 .mntflags = flags, 2304 }; 2305 int error; 2306 2307 dprintk("--> nfs_xdev_get_sb()\n"); 2308 2309 /* create a new volume representation */ 2310 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2311 if (IS_ERR(server)) { 2312 error = PTR_ERR(server); 2313 goto out_err_noserver; 2314 } 2315 sb_mntdata.server = server; 2316 2317 if (server->flags & NFS_MOUNT_UNSHARED) 2318 compare_super = NULL; 2319 2320 /* Get a superblock - note that we may end up sharing one that already exists */ 2321 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2322 if (IS_ERR(s)) { 2323 error = PTR_ERR(s); 2324 goto out_err_nosb; 2325 } 2326 2327 if (s->s_fs_info != server) { 2328 nfs_free_server(server); 2329 server = NULL; 2330 } else { 2331 error = nfs_bdi_register(server); 2332 if (error) 2333 goto error_splat_bdi; 2334 } 2335 2336 if (!s->s_root) { 2337 /* initial superblock/root creation */ 2338 nfs_clone_super(s, data->sb); 2339 nfs_fscache_get_super_cookie(s, NULL, data); 2340 } 2341 2342 mntroot = nfs_get_root(s, data->fh); 2343 if (IS_ERR(mntroot)) { 2344 error = PTR_ERR(mntroot); 2345 goto error_splat_super; 2346 } 2347 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2348 dput(mntroot); 2349 error = -ESTALE; 2350 goto error_splat_super; 2351 } 2352 2353 s->s_flags |= MS_ACTIVE; 2354 mnt->mnt_sb = s; 2355 mnt->mnt_root = mntroot; 2356 2357 /* clone any lsm security options from the parent to the new sb */ 2358 security_sb_clone_mnt_opts(data->sb, s); 2359 2360 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2361 return 0; 2362 2363 out_err_nosb: 2364 nfs_free_server(server); 2365 out_err_noserver: 2366 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2367 return error; 2368 2369 error_splat_super: 2370 if (server && !s->s_root) 2371 bdi_unregister(&server->backing_dev_info); 2372 error_splat_bdi: 2373 deactivate_locked_super(s); 2374 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2375 return error; 2376 } 2377 2378 #ifdef CONFIG_NFS_V4 2379 2380 /* 2381 * Finish setting up a cloned NFS4 superblock 2382 */ 2383 static void nfs4_clone_super(struct super_block *sb, 2384 const struct super_block *old_sb) 2385 { 2386 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2387 sb->s_blocksize = old_sb->s_blocksize; 2388 sb->s_maxbytes = old_sb->s_maxbytes; 2389 sb->s_time_gran = 1; 2390 sb->s_op = old_sb->s_op; 2391 nfs_initialise_sb(sb); 2392 } 2393 2394 /* 2395 * Set up an NFS4 superblock 2396 */ 2397 static void nfs4_fill_super(struct super_block *sb) 2398 { 2399 sb->s_time_gran = 1; 2400 sb->s_op = &nfs4_sops; 2401 nfs_initialise_sb(sb); 2402 } 2403 2404 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2405 { 2406 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2407 } 2408 2409 static int nfs4_validate_text_mount_data(void *options, 2410 struct nfs_parsed_mount_data *args, 2411 const char *dev_name) 2412 { 2413 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2414 2415 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2416 2417 nfs_validate_transport_protocol(args); 2418 2419 nfs4_validate_mount_flags(args); 2420 2421 if (args->version != 4) { 2422 dfprintk(MOUNT, 2423 "NFS4: Illegal mount version\n"); 2424 return -EINVAL; 2425 } 2426 2427 if (args->auth_flavor_len > 1) { 2428 dfprintk(MOUNT, 2429 "NFS4: Too many RPC auth flavours specified\n"); 2430 return -EINVAL; 2431 } 2432 2433 if (args->client_address == NULL) { 2434 dfprintk(MOUNT, 2435 "NFS4: mount program didn't pass callback address\n"); 2436 return -EINVAL; 2437 } 2438 2439 return nfs_parse_devname(dev_name, 2440 &args->nfs_server.hostname, 2441 NFS4_MAXNAMLEN, 2442 &args->nfs_server.export_path, 2443 NFS4_MAXPATHLEN); 2444 } 2445 2446 /* 2447 * Validate NFSv4 mount options 2448 */ 2449 static int nfs4_validate_mount_data(void *options, 2450 struct nfs_parsed_mount_data *args, 2451 const char *dev_name) 2452 { 2453 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2454 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2455 char *c; 2456 2457 if (data == NULL) 2458 goto out_no_data; 2459 2460 switch (data->version) { 2461 case 1: 2462 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2463 goto out_no_address; 2464 if (data->host_addrlen == 0) 2465 goto out_no_address; 2466 args->nfs_server.addrlen = data->host_addrlen; 2467 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2468 return -EFAULT; 2469 if (!nfs_verify_server_address(sap)) 2470 goto out_no_address; 2471 2472 if (data->auth_flavourlen) { 2473 if (data->auth_flavourlen > 1) 2474 goto out_inval_auth; 2475 if (copy_from_user(&args->auth_flavors[0], 2476 data->auth_flavours, 2477 sizeof(args->auth_flavors[0]))) 2478 return -EFAULT; 2479 } 2480 2481 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2482 if (IS_ERR(c)) 2483 return PTR_ERR(c); 2484 args->nfs_server.hostname = c; 2485 2486 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2487 if (IS_ERR(c)) 2488 return PTR_ERR(c); 2489 args->nfs_server.export_path = c; 2490 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2491 2492 c = strndup_user(data->client_addr.data, 16); 2493 if (IS_ERR(c)) 2494 return PTR_ERR(c); 2495 args->client_address = c; 2496 2497 /* 2498 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2499 * can deal with. 2500 */ 2501 2502 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2503 args->rsize = data->rsize; 2504 args->wsize = data->wsize; 2505 args->timeo = data->timeo; 2506 args->retrans = data->retrans; 2507 args->acregmin = data->acregmin; 2508 args->acregmax = data->acregmax; 2509 args->acdirmin = data->acdirmin; 2510 args->acdirmax = data->acdirmax; 2511 args->nfs_server.protocol = data->proto; 2512 nfs_validate_transport_protocol(args); 2513 2514 break; 2515 default: 2516 if (nfs_parse_mount_options((char *)options, args) == 0) 2517 return -EINVAL; 2518 2519 if (!nfs_verify_server_address(sap)) 2520 return -EINVAL; 2521 2522 return nfs4_validate_text_mount_data(options, args, dev_name); 2523 } 2524 2525 return 0; 2526 2527 out_no_data: 2528 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2529 return -EINVAL; 2530 2531 out_inval_auth: 2532 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2533 data->auth_flavourlen); 2534 return -EINVAL; 2535 2536 out_no_address: 2537 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2538 return -EINVAL; 2539 } 2540 2541 /* 2542 * Get the superblock for the NFS4 root partition 2543 */ 2544 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2545 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2546 { 2547 struct nfs_parsed_mount_data *data = raw_data; 2548 struct super_block *s; 2549 struct nfs_server *server; 2550 struct nfs_fh *mntfh; 2551 struct dentry *mntroot; 2552 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2553 struct nfs_sb_mountdata sb_mntdata = { 2554 .mntflags = flags, 2555 }; 2556 int error = -ENOMEM; 2557 2558 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2559 if (data == NULL || mntfh == NULL) 2560 goto out_free_fh; 2561 2562 security_init_mnt_opts(&data->lsm_opts); 2563 2564 /* Get a volume representation */ 2565 server = nfs4_create_server(data, mntfh); 2566 if (IS_ERR(server)) { 2567 error = PTR_ERR(server); 2568 goto out; 2569 } 2570 sb_mntdata.server = server; 2571 2572 if (server->flags & NFS4_MOUNT_UNSHARED) 2573 compare_super = NULL; 2574 2575 /* Get a superblock - note that we may end up sharing one that already exists */ 2576 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2577 if (IS_ERR(s)) { 2578 error = PTR_ERR(s); 2579 goto out_free; 2580 } 2581 2582 if (s->s_fs_info != server) { 2583 nfs_free_server(server); 2584 server = NULL; 2585 } else { 2586 error = nfs_bdi_register(server); 2587 if (error) 2588 goto error_splat_bdi; 2589 } 2590 2591 if (!s->s_root) { 2592 /* initial superblock/root creation */ 2593 nfs4_fill_super(s); 2594 nfs_fscache_get_super_cookie( 2595 s, data ? data->fscache_uniq : NULL, NULL); 2596 } 2597 2598 mntroot = nfs4_get_root(s, mntfh); 2599 if (IS_ERR(mntroot)) { 2600 error = PTR_ERR(mntroot); 2601 goto error_splat_super; 2602 } 2603 2604 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2605 if (error) 2606 goto error_splat_root; 2607 2608 s->s_flags |= MS_ACTIVE; 2609 mnt->mnt_sb = s; 2610 mnt->mnt_root = mntroot; 2611 error = 0; 2612 2613 out: 2614 security_free_mnt_opts(&data->lsm_opts); 2615 out_free_fh: 2616 kfree(mntfh); 2617 return error; 2618 2619 out_free: 2620 nfs_free_server(server); 2621 goto out; 2622 2623 error_splat_root: 2624 dput(mntroot); 2625 error_splat_super: 2626 if (server && !s->s_root) 2627 bdi_unregister(&server->backing_dev_info); 2628 error_splat_bdi: 2629 deactivate_locked_super(s); 2630 goto out; 2631 } 2632 2633 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2634 int flags, void *data, const char *hostname) 2635 { 2636 struct vfsmount *root_mnt; 2637 char *root_devname; 2638 size_t len; 2639 2640 len = strlen(hostname) + 3; 2641 root_devname = kmalloc(len, GFP_KERNEL); 2642 if (root_devname == NULL) 2643 return ERR_PTR(-ENOMEM); 2644 snprintf(root_devname, len, "%s:/", hostname); 2645 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2646 kfree(root_devname); 2647 return root_mnt; 2648 } 2649 2650 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2651 { 2652 char *page = (char *) __get_free_page(GFP_KERNEL); 2653 char *devname, *tmp; 2654 2655 if (page == NULL) 2656 return; 2657 devname = nfs_path(path->mnt->mnt_devname, 2658 path->mnt->mnt_root, path->dentry, 2659 page, PAGE_SIZE); 2660 if (devname == NULL) 2661 goto out_freepage; 2662 tmp = kstrdup(devname, GFP_KERNEL); 2663 if (tmp == NULL) 2664 goto out_freepage; 2665 kfree(mnt->mnt_devname); 2666 mnt->mnt_devname = tmp; 2667 out_freepage: 2668 free_page((unsigned long)page); 2669 } 2670 2671 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2672 const char *export_path, struct vfsmount *mnt_target) 2673 { 2674 struct mnt_namespace *ns_private; 2675 struct nameidata nd; 2676 struct super_block *s; 2677 int ret; 2678 2679 ns_private = create_mnt_ns(root_mnt); 2680 ret = PTR_ERR(ns_private); 2681 if (IS_ERR(ns_private)) 2682 goto out_mntput; 2683 2684 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2685 export_path, LOOKUP_FOLLOW, &nd); 2686 2687 put_mnt_ns(ns_private); 2688 2689 if (ret != 0) 2690 goto out_err; 2691 2692 s = nd.path.mnt->mnt_sb; 2693 atomic_inc(&s->s_active); 2694 mnt_target->mnt_sb = s; 2695 mnt_target->mnt_root = dget(nd.path.dentry); 2696 2697 /* Correct the device pathname */ 2698 nfs_fix_devname(&nd.path, mnt_target); 2699 2700 path_put(&nd.path); 2701 down_write(&s->s_umount); 2702 return 0; 2703 out_mntput: 2704 mntput(root_mnt); 2705 out_err: 2706 return ret; 2707 } 2708 2709 static int nfs4_try_mount(int flags, const char *dev_name, 2710 struct nfs_parsed_mount_data *data, 2711 struct vfsmount *mnt) 2712 { 2713 char *export_path; 2714 struct vfsmount *root_mnt; 2715 int error; 2716 2717 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2718 2719 export_path = data->nfs_server.export_path; 2720 data->nfs_server.export_path = "/"; 2721 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2722 data->nfs_server.hostname); 2723 data->nfs_server.export_path = export_path; 2724 2725 error = PTR_ERR(root_mnt); 2726 if (IS_ERR(root_mnt)) 2727 goto out; 2728 2729 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2730 2731 out: 2732 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2733 error != 0 ? " [error]" : ""); 2734 return error; 2735 } 2736 2737 /* 2738 * Get the superblock for an NFS4 mountpoint 2739 */ 2740 static int nfs4_get_sb(struct file_system_type *fs_type, 2741 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2742 { 2743 struct nfs_parsed_mount_data *data; 2744 int error = -ENOMEM; 2745 2746 data = nfs_alloc_parsed_mount_data(4); 2747 if (data == NULL) 2748 goto out_free_data; 2749 2750 /* Validate the mount data */ 2751 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2752 if (error < 0) 2753 goto out; 2754 2755 error = nfs4_try_mount(flags, dev_name, data, mnt); 2756 2757 out: 2758 kfree(data->client_address); 2759 kfree(data->nfs_server.export_path); 2760 kfree(data->nfs_server.hostname); 2761 kfree(data->fscache_uniq); 2762 out_free_data: 2763 kfree(data); 2764 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2765 error != 0 ? " [error]" : ""); 2766 return error; 2767 } 2768 2769 static void nfs4_kill_super(struct super_block *sb) 2770 { 2771 struct nfs_server *server = NFS_SB(sb); 2772 2773 dprintk("--> %s\n", __func__); 2774 nfs_super_return_all_delegations(sb); 2775 kill_anon_super(sb); 2776 nfs_fscache_release_super_cookie(sb); 2777 nfs_free_server(server); 2778 dprintk("<-- %s\n", __func__); 2779 } 2780 2781 /* 2782 * Clone an NFS4 server record on xdev traversal (FSID-change) 2783 */ 2784 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2785 const char *dev_name, void *raw_data, 2786 struct vfsmount *mnt) 2787 { 2788 struct nfs_clone_mount *data = raw_data; 2789 struct super_block *s; 2790 struct nfs_server *server; 2791 struct dentry *mntroot; 2792 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2793 struct nfs_sb_mountdata sb_mntdata = { 2794 .mntflags = flags, 2795 }; 2796 int error; 2797 2798 dprintk("--> nfs4_xdev_get_sb()\n"); 2799 2800 /* create a new volume representation */ 2801 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2802 if (IS_ERR(server)) { 2803 error = PTR_ERR(server); 2804 goto out_err_noserver; 2805 } 2806 sb_mntdata.server = server; 2807 2808 if (server->flags & NFS4_MOUNT_UNSHARED) 2809 compare_super = NULL; 2810 2811 /* Get a superblock - note that we may end up sharing one that already exists */ 2812 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2813 if (IS_ERR(s)) { 2814 error = PTR_ERR(s); 2815 goto out_err_nosb; 2816 } 2817 2818 if (s->s_fs_info != server) { 2819 nfs_free_server(server); 2820 server = NULL; 2821 } else { 2822 error = nfs_bdi_register(server); 2823 if (error) 2824 goto error_splat_bdi; 2825 } 2826 2827 if (!s->s_root) { 2828 /* initial superblock/root creation */ 2829 nfs4_clone_super(s, data->sb); 2830 nfs_fscache_get_super_cookie(s, NULL, data); 2831 } 2832 2833 mntroot = nfs4_get_root(s, data->fh); 2834 if (IS_ERR(mntroot)) { 2835 error = PTR_ERR(mntroot); 2836 goto error_splat_super; 2837 } 2838 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2839 dput(mntroot); 2840 error = -ESTALE; 2841 goto error_splat_super; 2842 } 2843 2844 s->s_flags |= MS_ACTIVE; 2845 mnt->mnt_sb = s; 2846 mnt->mnt_root = mntroot; 2847 2848 security_sb_clone_mnt_opts(data->sb, s); 2849 2850 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 2851 return 0; 2852 2853 out_err_nosb: 2854 nfs_free_server(server); 2855 out_err_noserver: 2856 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2857 return error; 2858 2859 error_splat_super: 2860 if (server && !s->s_root) 2861 bdi_unregister(&server->backing_dev_info); 2862 error_splat_bdi: 2863 deactivate_locked_super(s); 2864 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2865 return error; 2866 } 2867 2868 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2869 int flags, const char *dev_name, void *raw_data, 2870 struct vfsmount *mnt) 2871 { 2872 struct nfs_clone_mount *data = raw_data; 2873 struct super_block *s; 2874 struct nfs_server *server; 2875 struct dentry *mntroot; 2876 struct nfs_fh mntfh; 2877 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2878 struct nfs_sb_mountdata sb_mntdata = { 2879 .mntflags = flags, 2880 }; 2881 int error; 2882 2883 dprintk("--> nfs4_referral_get_sb()\n"); 2884 2885 /* create a new volume representation */ 2886 server = nfs4_create_referral_server(data, &mntfh); 2887 if (IS_ERR(server)) { 2888 error = PTR_ERR(server); 2889 goto out_err_noserver; 2890 } 2891 sb_mntdata.server = server; 2892 2893 if (server->flags & NFS4_MOUNT_UNSHARED) 2894 compare_super = NULL; 2895 2896 /* Get a superblock - note that we may end up sharing one that already exists */ 2897 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2898 if (IS_ERR(s)) { 2899 error = PTR_ERR(s); 2900 goto out_err_nosb; 2901 } 2902 2903 if (s->s_fs_info != server) { 2904 nfs_free_server(server); 2905 server = NULL; 2906 } else { 2907 error = nfs_bdi_register(server); 2908 if (error) 2909 goto error_splat_bdi; 2910 } 2911 2912 if (!s->s_root) { 2913 /* initial superblock/root creation */ 2914 nfs4_fill_super(s); 2915 nfs_fscache_get_super_cookie(s, NULL, data); 2916 } 2917 2918 mntroot = nfs4_get_root(s, &mntfh); 2919 if (IS_ERR(mntroot)) { 2920 error = PTR_ERR(mntroot); 2921 goto error_splat_super; 2922 } 2923 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2924 dput(mntroot); 2925 error = -ESTALE; 2926 goto error_splat_super; 2927 } 2928 2929 s->s_flags |= MS_ACTIVE; 2930 mnt->mnt_sb = s; 2931 mnt->mnt_root = mntroot; 2932 2933 security_sb_clone_mnt_opts(data->sb, s); 2934 2935 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2936 return 0; 2937 2938 out_err_nosb: 2939 nfs_free_server(server); 2940 out_err_noserver: 2941 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2942 return error; 2943 2944 error_splat_super: 2945 if (server && !s->s_root) 2946 bdi_unregister(&server->backing_dev_info); 2947 error_splat_bdi: 2948 deactivate_locked_super(s); 2949 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2950 return error; 2951 } 2952 2953 /* 2954 * Create an NFS4 server record on referral traversal 2955 */ 2956 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 2957 int flags, const char *dev_name, void *raw_data, 2958 struct vfsmount *mnt) 2959 { 2960 struct nfs_clone_mount *data = raw_data; 2961 char *export_path; 2962 struct vfsmount *root_mnt; 2963 int error; 2964 2965 dprintk("--> nfs4_referral_get_sb()\n"); 2966 2967 export_path = data->mnt_path; 2968 data->mnt_path = "/"; 2969 2970 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2971 flags, data, data->hostname); 2972 data->mnt_path = export_path; 2973 2974 error = PTR_ERR(root_mnt); 2975 if (IS_ERR(root_mnt)) 2976 goto out; 2977 2978 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2979 out: 2980 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 2981 error != 0 ? " [error]" : ""); 2982 return error; 2983 } 2984 2985 #endif /* CONFIG_NFS_V4 */ 2986