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_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 { Opt_fscache_uniq, "fsc=%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_fsstat res; 427 int error = -ENOMEM; 428 429 res.fattr = nfs_alloc_fattr(); 430 if (res.fattr == NULL) 431 goto out_err; 432 433 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 434 435 nfs_free_fattr(res.fattr); 436 if (error < 0) 437 goto out_err; 438 439 buf->f_type = NFS_SUPER_MAGIC; 440 441 /* 442 * Current versions of glibc do not correctly handle the 443 * case where f_frsize != f_bsize. Eventually we want to 444 * report the value of wtmult in this field. 445 */ 446 buf->f_frsize = dentry->d_sb->s_blocksize; 447 448 /* 449 * On most *nix systems, f_blocks, f_bfree, and f_bavail 450 * are reported in units of f_frsize. Linux hasn't had 451 * an f_frsize field in its statfs struct until recently, 452 * thus historically Linux's sys_statfs reports these 453 * fields in units of f_bsize. 454 */ 455 buf->f_bsize = dentry->d_sb->s_blocksize; 456 blockbits = dentry->d_sb->s_blocksize_bits; 457 blockres = (1 << blockbits) - 1; 458 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 459 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 460 buf->f_bavail = (res.abytes + blockres) >> blockbits; 461 462 buf->f_files = res.tfiles; 463 buf->f_ffree = res.afiles; 464 465 buf->f_namelen = server->namelen; 466 467 return 0; 468 469 out_err: 470 dprintk("%s: statfs error = %d\n", __func__, -error); 471 return error; 472 } 473 474 /* 475 * Map the security flavour number to a name 476 */ 477 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 478 { 479 static const struct { 480 rpc_authflavor_t flavour; 481 const char *str; 482 } sec_flavours[] = { 483 { RPC_AUTH_NULL, "null" }, 484 { RPC_AUTH_UNIX, "sys" }, 485 { RPC_AUTH_GSS_KRB5, "krb5" }, 486 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 487 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 488 { RPC_AUTH_GSS_LKEY, "lkey" }, 489 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 490 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 491 { RPC_AUTH_GSS_SPKM, "spkm" }, 492 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 493 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 494 { UINT_MAX, "unknown" } 495 }; 496 int i; 497 498 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 499 if (sec_flavours[i].flavour == flavour) 500 break; 501 } 502 return sec_flavours[i].str; 503 } 504 505 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 506 int showdefaults) 507 { 508 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 509 510 seq_printf(m, ",mountproto="); 511 switch (sap->sa_family) { 512 case AF_INET: 513 switch (nfss->mountd_protocol) { 514 case IPPROTO_UDP: 515 seq_printf(m, RPCBIND_NETID_UDP); 516 break; 517 case IPPROTO_TCP: 518 seq_printf(m, RPCBIND_NETID_TCP); 519 break; 520 default: 521 if (showdefaults) 522 seq_printf(m, "auto"); 523 } 524 break; 525 case AF_INET6: 526 switch (nfss->mountd_protocol) { 527 case IPPROTO_UDP: 528 seq_printf(m, RPCBIND_NETID_UDP6); 529 break; 530 case IPPROTO_TCP: 531 seq_printf(m, RPCBIND_NETID_TCP6); 532 break; 533 default: 534 if (showdefaults) 535 seq_printf(m, "auto"); 536 } 537 break; 538 default: 539 if (showdefaults) 540 seq_printf(m, "auto"); 541 } 542 } 543 544 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 545 int showdefaults) 546 { 547 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 548 549 switch (sap->sa_family) { 550 case AF_INET: { 551 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 552 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 553 break; 554 } 555 case AF_INET6: { 556 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 557 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 558 break; 559 } 560 default: 561 if (showdefaults) 562 seq_printf(m, ",mountaddr=unspecified"); 563 } 564 565 if (nfss->mountd_version || showdefaults) 566 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 567 if (nfss->mountd_port || showdefaults) 568 seq_printf(m, ",mountport=%u", nfss->mountd_port); 569 570 nfs_show_mountd_netid(m, nfss, showdefaults); 571 } 572 573 /* 574 * Describe the mount options in force on this server representation 575 */ 576 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 577 int showdefaults) 578 { 579 static const struct proc_nfs_info { 580 int flag; 581 const char *str; 582 const char *nostr; 583 } nfs_info[] = { 584 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 585 { NFS_MOUNT_POSIX, ",posix", "" }, 586 { NFS_MOUNT_NOCTO, ",nocto", "" }, 587 { NFS_MOUNT_NOAC, ",noac", "" }, 588 { NFS_MOUNT_NONLM, ",nolock", "" }, 589 { NFS_MOUNT_NOACL, ",noacl", "" }, 590 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 591 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 592 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 593 { 0, NULL, NULL } 594 }; 595 const struct proc_nfs_info *nfs_infop; 596 struct nfs_client *clp = nfss->nfs_client; 597 u32 version = clp->rpc_ops->version; 598 599 seq_printf(m, ",vers=%u", version); 600 seq_printf(m, ",rsize=%u", nfss->rsize); 601 seq_printf(m, ",wsize=%u", nfss->wsize); 602 if (nfss->bsize != 0) 603 seq_printf(m, ",bsize=%u", nfss->bsize); 604 seq_printf(m, ",namlen=%u", nfss->namelen); 605 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 606 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 607 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 608 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 609 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 610 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 611 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 612 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 613 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 614 if (nfss->flags & nfs_infop->flag) 615 seq_puts(m, nfs_infop->str); 616 else 617 seq_puts(m, nfs_infop->nostr); 618 } 619 seq_printf(m, ",proto=%s", 620 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 621 if (version == 4) { 622 if (nfss->port != NFS_PORT) 623 seq_printf(m, ",port=%u", nfss->port); 624 } else 625 if (nfss->port) 626 seq_printf(m, ",port=%u", nfss->port); 627 628 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 629 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 630 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 631 632 if (version != 4) 633 nfs_show_mountd_options(m, nfss, showdefaults); 634 635 #ifdef CONFIG_NFS_V4 636 if (clp->rpc_ops->version == 4) 637 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 638 #endif 639 if (nfss->options & NFS_OPTION_FSCACHE) 640 seq_printf(m, ",fsc"); 641 } 642 643 /* 644 * Describe the mount options on this VFS mountpoint 645 */ 646 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 647 { 648 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 649 650 nfs_show_mount_options(m, nfss, 0); 651 652 seq_printf(m, ",addr=%s", 653 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 654 RPC_DISPLAY_ADDR)); 655 656 return 0; 657 } 658 659 /* 660 * Present statistical information for this VFS mountpoint 661 */ 662 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 663 { 664 int i, cpu; 665 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 666 struct rpc_auth *auth = nfss->client->cl_auth; 667 struct nfs_iostats totals = { }; 668 669 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 670 671 /* 672 * Display all mount option settings 673 */ 674 seq_printf(m, "\n\topts:\t"); 675 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 676 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 677 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 678 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 679 nfs_show_mount_options(m, nfss, 1); 680 681 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 682 683 seq_printf(m, "\n\tcaps:\t"); 684 seq_printf(m, "caps=0x%x", nfss->caps); 685 seq_printf(m, ",wtmult=%u", nfss->wtmult); 686 seq_printf(m, ",dtsize=%u", nfss->dtsize); 687 seq_printf(m, ",bsize=%u", nfss->bsize); 688 seq_printf(m, ",namlen=%u", nfss->namelen); 689 690 #ifdef CONFIG_NFS_V4 691 if (nfss->nfs_client->rpc_ops->version == 4) { 692 seq_printf(m, "\n\tnfsv4:\t"); 693 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 694 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 695 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 696 } 697 #endif 698 699 /* 700 * Display security flavor in effect for this mount 701 */ 702 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 703 if (auth->au_flavor) 704 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 705 706 /* 707 * Display superblock I/O counters 708 */ 709 for_each_possible_cpu(cpu) { 710 struct nfs_iostats *stats; 711 712 preempt_disable(); 713 stats = per_cpu_ptr(nfss->io_stats, cpu); 714 715 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 716 totals.events[i] += stats->events[i]; 717 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 718 totals.bytes[i] += stats->bytes[i]; 719 #ifdef CONFIG_NFS_FSCACHE 720 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 721 totals.fscache[i] += stats->fscache[i]; 722 #endif 723 724 preempt_enable(); 725 } 726 727 seq_printf(m, "\n\tevents:\t"); 728 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 729 seq_printf(m, "%lu ", totals.events[i]); 730 seq_printf(m, "\n\tbytes:\t"); 731 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 732 seq_printf(m, "%Lu ", totals.bytes[i]); 733 #ifdef CONFIG_NFS_FSCACHE 734 if (nfss->options & NFS_OPTION_FSCACHE) { 735 seq_printf(m, "\n\tfsc:\t"); 736 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 737 seq_printf(m, "%Lu ", totals.bytes[i]); 738 } 739 #endif 740 seq_printf(m, "\n"); 741 742 rpc_print_iostats(m, nfss->client); 743 744 return 0; 745 } 746 747 /* 748 * Begin unmount by attempting to remove all automounted mountpoints we added 749 * in response to xdev traversals and referrals 750 */ 751 static void nfs_umount_begin(struct super_block *sb) 752 { 753 struct nfs_server *server; 754 struct rpc_clnt *rpc; 755 756 server = NFS_SB(sb); 757 /* -EIO all pending I/O */ 758 rpc = server->client_acl; 759 if (!IS_ERR(rpc)) 760 rpc_killall_tasks(rpc); 761 rpc = server->client; 762 if (!IS_ERR(rpc)) 763 rpc_killall_tasks(rpc); 764 } 765 766 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 767 { 768 struct nfs_parsed_mount_data *data; 769 770 data = kzalloc(sizeof(*data), GFP_KERNEL); 771 if (data) { 772 data->acregmin = NFS_DEF_ACREGMIN; 773 data->acregmax = NFS_DEF_ACREGMAX; 774 data->acdirmin = NFS_DEF_ACDIRMIN; 775 data->acdirmax = NFS_DEF_ACDIRMAX; 776 data->mount_server.port = NFS_UNSPEC_PORT; 777 data->nfs_server.port = NFS_UNSPEC_PORT; 778 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 779 data->auth_flavors[0] = RPC_AUTH_UNIX; 780 data->auth_flavor_len = 1; 781 data->version = version; 782 data->minorversion = 0; 783 } 784 return data; 785 } 786 787 /* 788 * Sanity-check a server address provided by the mount command. 789 * 790 * Address family must be initialized, and address must not be 791 * the ANY address for that family. 792 */ 793 static int nfs_verify_server_address(struct sockaddr *addr) 794 { 795 switch (addr->sa_family) { 796 case AF_INET: { 797 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 798 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 799 } 800 case AF_INET6: { 801 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 802 return !ipv6_addr_any(sa); 803 } 804 } 805 806 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 807 return 0; 808 } 809 810 /* 811 * Select between a default port value and a user-specified port value. 812 * If a zero value is set, then autobind will be used. 813 */ 814 static void nfs_set_port(struct sockaddr *sap, int *port, 815 const unsigned short default_port) 816 { 817 if (*port == NFS_UNSPEC_PORT) 818 *port = default_port; 819 820 rpc_set_port(sap, *port); 821 } 822 823 /* 824 * Sanity check the NFS transport protocol. 825 * 826 */ 827 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 828 { 829 switch (mnt->nfs_server.protocol) { 830 case XPRT_TRANSPORT_UDP: 831 case XPRT_TRANSPORT_TCP: 832 case XPRT_TRANSPORT_RDMA: 833 break; 834 default: 835 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 836 } 837 } 838 839 /* 840 * For text based NFSv2/v3 mounts, the mount protocol transport default 841 * settings should depend upon the specified NFS transport. 842 */ 843 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 844 { 845 nfs_validate_transport_protocol(mnt); 846 847 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 848 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 849 return; 850 switch (mnt->nfs_server.protocol) { 851 case XPRT_TRANSPORT_UDP: 852 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 853 break; 854 case XPRT_TRANSPORT_TCP: 855 case XPRT_TRANSPORT_RDMA: 856 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 857 } 858 } 859 860 /* 861 * Parse the value of the 'sec=' option. 862 */ 863 static int nfs_parse_security_flavors(char *value, 864 struct nfs_parsed_mount_data *mnt) 865 { 866 substring_t args[MAX_OPT_ARGS]; 867 868 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 869 870 switch (match_token(value, nfs_secflavor_tokens, args)) { 871 case Opt_sec_none: 872 mnt->auth_flavors[0] = RPC_AUTH_NULL; 873 break; 874 case Opt_sec_sys: 875 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 876 break; 877 case Opt_sec_krb5: 878 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 879 break; 880 case Opt_sec_krb5i: 881 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 882 break; 883 case Opt_sec_krb5p: 884 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 885 break; 886 case Opt_sec_lkey: 887 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 888 break; 889 case Opt_sec_lkeyi: 890 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 891 break; 892 case Opt_sec_lkeyp: 893 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 894 break; 895 case Opt_sec_spkm: 896 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 897 break; 898 case Opt_sec_spkmi: 899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 900 break; 901 case Opt_sec_spkmp: 902 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 903 break; 904 default: 905 return 0; 906 } 907 908 mnt->auth_flavor_len = 1; 909 return 1; 910 } 911 912 /* 913 * Error-check and convert a string of mount options from user space into 914 * a data structure. The whole mount string is processed; bad options are 915 * skipped as they are encountered. If there were no errors, return 1; 916 * otherwise return 0 (zero). 917 */ 918 static int nfs_parse_mount_options(char *raw, 919 struct nfs_parsed_mount_data *mnt) 920 { 921 char *p, *string, *secdata; 922 int rc, sloppy = 0, invalid_option = 0; 923 unsigned short protofamily = AF_UNSPEC; 924 unsigned short mountfamily = AF_UNSPEC; 925 926 if (!raw) { 927 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 928 return 1; 929 } 930 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 931 932 secdata = alloc_secdata(); 933 if (!secdata) 934 goto out_nomem; 935 936 rc = security_sb_copy_data(raw, secdata); 937 if (rc) 938 goto out_security_failure; 939 940 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 941 if (rc) 942 goto out_security_failure; 943 944 free_secdata(secdata); 945 946 while ((p = strsep(&raw, ",")) != NULL) { 947 substring_t args[MAX_OPT_ARGS]; 948 unsigned long option; 949 int token; 950 951 if (!*p) 952 continue; 953 954 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 955 956 token = match_token(p, nfs_mount_option_tokens, args); 957 switch (token) { 958 959 /* 960 * boolean options: foo/nofoo 961 */ 962 case Opt_soft: 963 mnt->flags |= NFS_MOUNT_SOFT; 964 break; 965 case Opt_hard: 966 mnt->flags &= ~NFS_MOUNT_SOFT; 967 break; 968 case Opt_posix: 969 mnt->flags |= NFS_MOUNT_POSIX; 970 break; 971 case Opt_noposix: 972 mnt->flags &= ~NFS_MOUNT_POSIX; 973 break; 974 case Opt_cto: 975 mnt->flags &= ~NFS_MOUNT_NOCTO; 976 break; 977 case Opt_nocto: 978 mnt->flags |= NFS_MOUNT_NOCTO; 979 break; 980 case Opt_ac: 981 mnt->flags &= ~NFS_MOUNT_NOAC; 982 break; 983 case Opt_noac: 984 mnt->flags |= NFS_MOUNT_NOAC; 985 break; 986 case Opt_lock: 987 mnt->flags &= ~NFS_MOUNT_NONLM; 988 break; 989 case Opt_nolock: 990 mnt->flags |= NFS_MOUNT_NONLM; 991 break; 992 case Opt_v2: 993 mnt->flags &= ~NFS_MOUNT_VER3; 994 mnt->version = 2; 995 break; 996 case Opt_v3: 997 mnt->flags |= NFS_MOUNT_VER3; 998 mnt->version = 3; 999 break; 1000 #ifdef CONFIG_NFS_V4 1001 case Opt_v4: 1002 mnt->flags &= ~NFS_MOUNT_VER3; 1003 mnt->version = 4; 1004 break; 1005 #endif 1006 case Opt_udp: 1007 mnt->flags &= ~NFS_MOUNT_TCP; 1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1009 break; 1010 case Opt_tcp: 1011 mnt->flags |= NFS_MOUNT_TCP; 1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1013 break; 1014 case Opt_rdma: 1015 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1016 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1017 xprt_load_transport(p); 1018 break; 1019 case Opt_acl: 1020 mnt->flags &= ~NFS_MOUNT_NOACL; 1021 break; 1022 case Opt_noacl: 1023 mnt->flags |= NFS_MOUNT_NOACL; 1024 break; 1025 case Opt_rdirplus: 1026 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1027 break; 1028 case Opt_nordirplus: 1029 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1030 break; 1031 case Opt_sharecache: 1032 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1033 break; 1034 case Opt_nosharecache: 1035 mnt->flags |= NFS_MOUNT_UNSHARED; 1036 break; 1037 case Opt_resvport: 1038 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1039 break; 1040 case Opt_noresvport: 1041 mnt->flags |= NFS_MOUNT_NORESVPORT; 1042 break; 1043 case Opt_fscache: 1044 mnt->options |= NFS_OPTION_FSCACHE; 1045 kfree(mnt->fscache_uniq); 1046 mnt->fscache_uniq = NULL; 1047 break; 1048 case Opt_nofscache: 1049 mnt->options &= ~NFS_OPTION_FSCACHE; 1050 kfree(mnt->fscache_uniq); 1051 mnt->fscache_uniq = NULL; 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 > USHRT_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 > USHRT_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 case Opt_fscache_uniq: 1384 string = match_strdup(args); 1385 if (string == NULL) 1386 goto out_nomem; 1387 kfree(mnt->fscache_uniq); 1388 mnt->fscache_uniq = string; 1389 mnt->options |= NFS_OPTION_FSCACHE; 1390 break; 1391 1392 /* 1393 * Special options 1394 */ 1395 case Opt_sloppy: 1396 sloppy = 1; 1397 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1398 break; 1399 case Opt_userspace: 1400 case Opt_deprecated: 1401 dfprintk(MOUNT, "NFS: ignoring mount option " 1402 "'%s'\n", p); 1403 break; 1404 1405 default: 1406 invalid_option = 1; 1407 dfprintk(MOUNT, "NFS: unrecognized mount option " 1408 "'%s'\n", p); 1409 } 1410 } 1411 1412 if (!sloppy && invalid_option) 1413 return 0; 1414 1415 /* 1416 * verify that any proto=/mountproto= options match the address 1417 * familiies in the addr=/mountaddr= options. 1418 */ 1419 if (protofamily != AF_UNSPEC && 1420 protofamily != mnt->nfs_server.address.ss_family) 1421 goto out_proto_mismatch; 1422 1423 if (mountfamily != AF_UNSPEC) { 1424 if (mnt->mount_server.addrlen) { 1425 if (mountfamily != mnt->mount_server.address.ss_family) 1426 goto out_mountproto_mismatch; 1427 } else { 1428 if (mountfamily != mnt->nfs_server.address.ss_family) 1429 goto out_mountproto_mismatch; 1430 } 1431 } 1432 1433 return 1; 1434 1435 out_mountproto_mismatch: 1436 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1437 "option\n"); 1438 return 0; 1439 out_proto_mismatch: 1440 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1441 return 0; 1442 out_invalid_address: 1443 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1444 return 0; 1445 out_invalid_value: 1446 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1447 return 0; 1448 out_nomem: 1449 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1450 return 0; 1451 out_security_failure: 1452 free_secdata(secdata); 1453 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1454 return 0; 1455 } 1456 1457 /* 1458 * Match the requested auth flavors with the list returned by 1459 * the server. Returns zero and sets the mount's authentication 1460 * flavor on success; returns -EACCES if server does not support 1461 * the requested flavor. 1462 */ 1463 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1464 struct nfs_mount_request *request) 1465 { 1466 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1467 1468 /* 1469 * Certain releases of Linux's mountd return an empty 1470 * flavor list. To prevent behavioral regression with 1471 * these servers (ie. rejecting mounts that used to 1472 * succeed), revert to pre-2.6.32 behavior (no checking) 1473 * if the returned flavor list is empty. 1474 */ 1475 if (server_authlist_len == 0) 1476 return 0; 1477 1478 /* 1479 * We avoid sophisticated negotiating here, as there are 1480 * plenty of cases where we can get it wrong, providing 1481 * either too little or too much security. 1482 * 1483 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1484 * flavor listed first. However, some servers list 1485 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1486 * preferred default, in args->auth_flavors[0] if user 1487 * didn't specify sec= mount option. 1488 */ 1489 for (i = 0; i < args->auth_flavor_len; i++) 1490 for (j = 0; j < server_authlist_len; j++) 1491 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1492 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1493 request->auth_flavs[j]); 1494 args->auth_flavors[0] = request->auth_flavs[j]; 1495 return 0; 1496 } 1497 1498 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1499 nfs_umount(request); 1500 return -EACCES; 1501 } 1502 1503 /* 1504 * Use the remote server's MOUNT service to request the NFS file handle 1505 * corresponding to the provided path. 1506 */ 1507 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1508 struct nfs_fh *root_fh) 1509 { 1510 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1511 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1512 struct nfs_mount_request request = { 1513 .sap = (struct sockaddr *) 1514 &args->mount_server.address, 1515 .dirpath = args->nfs_server.export_path, 1516 .protocol = args->mount_server.protocol, 1517 .fh = root_fh, 1518 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1519 .auth_flav_len = &server_authlist_len, 1520 .auth_flavs = server_authlist, 1521 }; 1522 int status; 1523 1524 if (args->mount_server.version == 0) { 1525 switch (args->version) { 1526 default: 1527 args->mount_server.version = NFS_MNT3_VERSION; 1528 break; 1529 case 2: 1530 args->mount_server.version = NFS_MNT_VERSION; 1531 } 1532 } 1533 request.version = args->mount_server.version; 1534 1535 if (args->mount_server.hostname) 1536 request.hostname = args->mount_server.hostname; 1537 else 1538 request.hostname = args->nfs_server.hostname; 1539 1540 /* 1541 * Construct the mount server's address. 1542 */ 1543 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1544 memcpy(request.sap, &args->nfs_server.address, 1545 args->nfs_server.addrlen); 1546 args->mount_server.addrlen = args->nfs_server.addrlen; 1547 } 1548 request.salen = args->mount_server.addrlen; 1549 nfs_set_port(request.sap, &args->mount_server.port, 0); 1550 1551 /* 1552 * Now ask the mount server to map our export path 1553 * to a file handle. 1554 */ 1555 status = nfs_mount(&request); 1556 if (status != 0) { 1557 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1558 request.hostname, status); 1559 return status; 1560 } 1561 1562 /* 1563 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1564 */ 1565 if (args->mount_server.version != NFS_MNT3_VERSION) 1566 return 0; 1567 return nfs_walk_authlist(args, &request); 1568 } 1569 1570 static int nfs_parse_simple_hostname(const char *dev_name, 1571 char **hostname, size_t maxnamlen, 1572 char **export_path, size_t maxpathlen) 1573 { 1574 size_t len; 1575 char *colon, *comma; 1576 1577 colon = strchr(dev_name, ':'); 1578 if (colon == NULL) 1579 goto out_bad_devname; 1580 1581 len = colon - dev_name; 1582 if (len > maxnamlen) 1583 goto out_hostname; 1584 1585 /* N.B. caller will free nfs_server.hostname in all cases */ 1586 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1587 if (!*hostname) 1588 goto out_nomem; 1589 1590 /* kill possible hostname list: not supported */ 1591 comma = strchr(*hostname, ','); 1592 if (comma != NULL) { 1593 if (comma == *hostname) 1594 goto out_bad_devname; 1595 *comma = '\0'; 1596 } 1597 1598 colon++; 1599 len = strlen(colon); 1600 if (len > maxpathlen) 1601 goto out_path; 1602 *export_path = kstrndup(colon, len, GFP_KERNEL); 1603 if (!*export_path) 1604 goto out_nomem; 1605 1606 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1607 return 0; 1608 1609 out_bad_devname: 1610 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1611 return -EINVAL; 1612 1613 out_nomem: 1614 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1615 return -ENOMEM; 1616 1617 out_hostname: 1618 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1619 return -ENAMETOOLONG; 1620 1621 out_path: 1622 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1623 return -ENAMETOOLONG; 1624 } 1625 1626 /* 1627 * Hostname has square brackets around it because it contains one or 1628 * more colons. We look for the first closing square bracket, and a 1629 * colon must follow it. 1630 */ 1631 static int nfs_parse_protected_hostname(const char *dev_name, 1632 char **hostname, size_t maxnamlen, 1633 char **export_path, size_t maxpathlen) 1634 { 1635 size_t len; 1636 char *start, *end; 1637 1638 start = (char *)(dev_name + 1); 1639 1640 end = strchr(start, ']'); 1641 if (end == NULL) 1642 goto out_bad_devname; 1643 if (*(end + 1) != ':') 1644 goto out_bad_devname; 1645 1646 len = end - start; 1647 if (len > maxnamlen) 1648 goto out_hostname; 1649 1650 /* N.B. caller will free nfs_server.hostname in all cases */ 1651 *hostname = kstrndup(start, len, GFP_KERNEL); 1652 if (*hostname == NULL) 1653 goto out_nomem; 1654 1655 end += 2; 1656 len = strlen(end); 1657 if (len > maxpathlen) 1658 goto out_path; 1659 *export_path = kstrndup(end, len, GFP_KERNEL); 1660 if (!*export_path) 1661 goto out_nomem; 1662 1663 return 0; 1664 1665 out_bad_devname: 1666 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1667 return -EINVAL; 1668 1669 out_nomem: 1670 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1671 return -ENOMEM; 1672 1673 out_hostname: 1674 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1675 return -ENAMETOOLONG; 1676 1677 out_path: 1678 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1679 return -ENAMETOOLONG; 1680 } 1681 1682 /* 1683 * Split "dev_name" into "hostname:export_path". 1684 * 1685 * The leftmost colon demarks the split between the server's hostname 1686 * and the export path. If the hostname starts with a left square 1687 * bracket, then it may contain colons. 1688 * 1689 * Note: caller frees hostname and export path, even on error. 1690 */ 1691 static int nfs_parse_devname(const char *dev_name, 1692 char **hostname, size_t maxnamlen, 1693 char **export_path, size_t maxpathlen) 1694 { 1695 if (*dev_name == '[') 1696 return nfs_parse_protected_hostname(dev_name, 1697 hostname, maxnamlen, 1698 export_path, maxpathlen); 1699 1700 return nfs_parse_simple_hostname(dev_name, 1701 hostname, maxnamlen, 1702 export_path, maxpathlen); 1703 } 1704 1705 /* 1706 * Validate the NFS2/NFS3 mount data 1707 * - fills in the mount root filehandle 1708 * 1709 * For option strings, user space handles the following behaviors: 1710 * 1711 * + DNS: mapping server host name to IP address ("addr=" option) 1712 * 1713 * + failure mode: how to behave if a mount request can't be handled 1714 * immediately ("fg/bg" option) 1715 * 1716 * + retry: how often to retry a mount request ("retry=" option) 1717 * 1718 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1719 * mountproto=tcp after mountproto=udp, and so on 1720 */ 1721 static int nfs_validate_mount_data(void *options, 1722 struct nfs_parsed_mount_data *args, 1723 struct nfs_fh *mntfh, 1724 const char *dev_name) 1725 { 1726 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1727 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1728 1729 if (data == NULL) 1730 goto out_no_data; 1731 1732 switch (data->version) { 1733 case 1: 1734 data->namlen = 0; 1735 case 2: 1736 data->bsize = 0; 1737 case 3: 1738 if (data->flags & NFS_MOUNT_VER3) 1739 goto out_no_v3; 1740 data->root.size = NFS2_FHSIZE; 1741 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1742 case 4: 1743 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1744 goto out_no_sec; 1745 case 5: 1746 memset(data->context, 0, sizeof(data->context)); 1747 case 6: 1748 if (data->flags & NFS_MOUNT_VER3) { 1749 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1750 goto out_invalid_fh; 1751 mntfh->size = data->root.size; 1752 args->version = 3; 1753 } else { 1754 mntfh->size = NFS2_FHSIZE; 1755 args->version = 2; 1756 } 1757 1758 1759 memcpy(mntfh->data, data->root.data, mntfh->size); 1760 if (mntfh->size < sizeof(mntfh->data)) 1761 memset(mntfh->data + mntfh->size, 0, 1762 sizeof(mntfh->data) - mntfh->size); 1763 1764 /* 1765 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1766 * can deal with. 1767 */ 1768 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1769 args->rsize = data->rsize; 1770 args->wsize = data->wsize; 1771 args->timeo = data->timeo; 1772 args->retrans = data->retrans; 1773 args->acregmin = data->acregmin; 1774 args->acregmax = data->acregmax; 1775 args->acdirmin = data->acdirmin; 1776 args->acdirmax = data->acdirmax; 1777 1778 memcpy(sap, &data->addr, sizeof(data->addr)); 1779 args->nfs_server.addrlen = sizeof(data->addr); 1780 if (!nfs_verify_server_address(sap)) 1781 goto out_no_address; 1782 1783 if (!(data->flags & NFS_MOUNT_TCP)) 1784 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1785 /* N.B. caller will free nfs_server.hostname in all cases */ 1786 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1787 args->namlen = data->namlen; 1788 args->bsize = data->bsize; 1789 1790 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1791 args->auth_flavors[0] = data->pseudoflavor; 1792 if (!args->nfs_server.hostname) 1793 goto out_nomem; 1794 1795 /* 1796 * The legacy version 6 binary mount data from userspace has a 1797 * field used only to transport selinux information into the 1798 * the kernel. To continue to support that functionality we 1799 * have a touch of selinux knowledge here in the NFS code. The 1800 * userspace code converted context=blah to just blah so we are 1801 * converting back to the full string selinux understands. 1802 */ 1803 if (data->context[0]){ 1804 #ifdef CONFIG_SECURITY_SELINUX 1805 int rc; 1806 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1807 if (!opts_str) 1808 return -ENOMEM; 1809 strcpy(opts_str, "context="); 1810 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1811 strcat(opts_str, &data->context[0]); 1812 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1813 kfree(opts_str); 1814 if (rc) 1815 return rc; 1816 #else 1817 return -EINVAL; 1818 #endif 1819 } 1820 1821 break; 1822 default: { 1823 int status; 1824 1825 if (nfs_parse_mount_options((char *)options, args) == 0) 1826 return -EINVAL; 1827 1828 if (!nfs_verify_server_address(sap)) 1829 goto out_no_address; 1830 1831 if (args->version == 4) 1832 #ifdef CONFIG_NFS_V4 1833 return nfs4_validate_text_mount_data(options, 1834 args, dev_name); 1835 #else 1836 goto out_v4_not_compiled; 1837 #endif 1838 1839 nfs_set_port(sap, &args->nfs_server.port, 0); 1840 1841 nfs_set_mount_transport_protocol(args); 1842 1843 status = nfs_parse_devname(dev_name, 1844 &args->nfs_server.hostname, 1845 PAGE_SIZE, 1846 &args->nfs_server.export_path, 1847 NFS_MAXPATHLEN); 1848 if (!status) 1849 status = nfs_try_mount(args, mntfh); 1850 1851 kfree(args->nfs_server.export_path); 1852 args->nfs_server.export_path = NULL; 1853 1854 if (status) 1855 return status; 1856 1857 break; 1858 } 1859 } 1860 1861 #ifndef CONFIG_NFS_V3 1862 if (args->version == 3) 1863 goto out_v3_not_compiled; 1864 #endif /* !CONFIG_NFS_V3 */ 1865 1866 return 0; 1867 1868 out_no_data: 1869 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1870 return -EINVAL; 1871 1872 out_no_v3: 1873 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1874 data->version); 1875 return -EINVAL; 1876 1877 out_no_sec: 1878 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1879 return -EINVAL; 1880 1881 #ifndef CONFIG_NFS_V3 1882 out_v3_not_compiled: 1883 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1884 return -EPROTONOSUPPORT; 1885 #endif /* !CONFIG_NFS_V3 */ 1886 1887 #ifndef CONFIG_NFS_V4 1888 out_v4_not_compiled: 1889 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1890 return -EPROTONOSUPPORT; 1891 #endif /* !CONFIG_NFS_V4 */ 1892 1893 out_nomem: 1894 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1895 return -ENOMEM; 1896 1897 out_no_address: 1898 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1899 return -EINVAL; 1900 1901 out_invalid_fh: 1902 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1903 return -EINVAL; 1904 } 1905 1906 static int 1907 nfs_compare_remount_data(struct nfs_server *nfss, 1908 struct nfs_parsed_mount_data *data) 1909 { 1910 if (data->flags != nfss->flags || 1911 data->rsize != nfss->rsize || 1912 data->wsize != nfss->wsize || 1913 data->retrans != nfss->client->cl_timeout->to_retries || 1914 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1915 data->acregmin != nfss->acregmin / HZ || 1916 data->acregmax != nfss->acregmax / HZ || 1917 data->acdirmin != nfss->acdirmin / HZ || 1918 data->acdirmax != nfss->acdirmax / HZ || 1919 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1920 data->nfs_server.port != nfss->port || 1921 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1922 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1923 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1924 return -EINVAL; 1925 1926 return 0; 1927 } 1928 1929 static int 1930 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1931 { 1932 int error; 1933 struct nfs_server *nfss = sb->s_fs_info; 1934 struct nfs_parsed_mount_data *data; 1935 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1936 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1937 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1938 1939 /* 1940 * Userspace mount programs that send binary options generally send 1941 * them populated with default values. We have no way to know which 1942 * ones were explicitly specified. Fall back to legacy behavior and 1943 * just return success. 1944 */ 1945 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1946 (nfsvers <= 3 && (!options || (options->version >= 1 && 1947 options->version <= 6)))) 1948 return 0; 1949 1950 data = kzalloc(sizeof(*data), GFP_KERNEL); 1951 if (data == NULL) 1952 return -ENOMEM; 1953 1954 /* fill out struct with values from existing mount */ 1955 data->flags = nfss->flags; 1956 data->rsize = nfss->rsize; 1957 data->wsize = nfss->wsize; 1958 data->retrans = nfss->client->cl_timeout->to_retries; 1959 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1960 data->acregmin = nfss->acregmin / HZ; 1961 data->acregmax = nfss->acregmax / HZ; 1962 data->acdirmin = nfss->acdirmin / HZ; 1963 data->acdirmax = nfss->acdirmax / HZ; 1964 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1965 data->nfs_server.port = nfss->port; 1966 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1967 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1968 data->nfs_server.addrlen); 1969 1970 /* overwrite those values with any that were specified */ 1971 error = nfs_parse_mount_options((char *)options, data); 1972 if (error < 0) 1973 goto out; 1974 1975 /* compare new mount options with old ones */ 1976 error = nfs_compare_remount_data(nfss, data); 1977 out: 1978 kfree(data); 1979 return error; 1980 } 1981 1982 /* 1983 * Initialise the common bits of the superblock 1984 */ 1985 static inline void nfs_initialise_sb(struct super_block *sb) 1986 { 1987 struct nfs_server *server = NFS_SB(sb); 1988 1989 sb->s_magic = NFS_SUPER_MAGIC; 1990 1991 /* We probably want something more informative here */ 1992 snprintf(sb->s_id, sizeof(sb->s_id), 1993 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1994 1995 if (sb->s_blocksize == 0) 1996 sb->s_blocksize = nfs_block_bits(server->wsize, 1997 &sb->s_blocksize_bits); 1998 1999 if (server->flags & NFS_MOUNT_NOAC) 2000 sb->s_flags |= MS_SYNCHRONOUS; 2001 2002 sb->s_bdi = &server->backing_dev_info; 2003 2004 nfs_super_set_maxbytes(sb, server->maxfilesize); 2005 } 2006 2007 /* 2008 * Finish setting up an NFS2/3 superblock 2009 */ 2010 static void nfs_fill_super(struct super_block *sb, 2011 struct nfs_parsed_mount_data *data) 2012 { 2013 struct nfs_server *server = NFS_SB(sb); 2014 2015 sb->s_blocksize_bits = 0; 2016 sb->s_blocksize = 0; 2017 if (data->bsize) 2018 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2019 2020 if (server->nfs_client->rpc_ops->version == 3) { 2021 /* The VFS shouldn't apply the umask to mode bits. We will do 2022 * so ourselves when necessary. 2023 */ 2024 sb->s_flags |= MS_POSIXACL; 2025 sb->s_time_gran = 1; 2026 } 2027 2028 sb->s_op = &nfs_sops; 2029 nfs_initialise_sb(sb); 2030 } 2031 2032 /* 2033 * Finish setting up a cloned NFS2/3 superblock 2034 */ 2035 static void nfs_clone_super(struct super_block *sb, 2036 const struct super_block *old_sb) 2037 { 2038 struct nfs_server *server = NFS_SB(sb); 2039 2040 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2041 sb->s_blocksize = old_sb->s_blocksize; 2042 sb->s_maxbytes = old_sb->s_maxbytes; 2043 2044 if (server->nfs_client->rpc_ops->version == 3) { 2045 /* The VFS shouldn't apply the umask to mode bits. We will do 2046 * so ourselves when necessary. 2047 */ 2048 sb->s_flags |= MS_POSIXACL; 2049 sb->s_time_gran = 1; 2050 } 2051 2052 sb->s_op = old_sb->s_op; 2053 nfs_initialise_sb(sb); 2054 } 2055 2056 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2057 { 2058 const struct nfs_server *a = s->s_fs_info; 2059 const struct rpc_clnt *clnt_a = a->client; 2060 const struct rpc_clnt *clnt_b = b->client; 2061 2062 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2063 goto Ebusy; 2064 if (a->nfs_client != b->nfs_client) 2065 goto Ebusy; 2066 if (a->flags != b->flags) 2067 goto Ebusy; 2068 if (a->wsize != b->wsize) 2069 goto Ebusy; 2070 if (a->rsize != b->rsize) 2071 goto Ebusy; 2072 if (a->acregmin != b->acregmin) 2073 goto Ebusy; 2074 if (a->acregmax != b->acregmax) 2075 goto Ebusy; 2076 if (a->acdirmin != b->acdirmin) 2077 goto Ebusy; 2078 if (a->acdirmax != b->acdirmax) 2079 goto Ebusy; 2080 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2081 goto Ebusy; 2082 return 1; 2083 Ebusy: 2084 return 0; 2085 } 2086 2087 struct nfs_sb_mountdata { 2088 struct nfs_server *server; 2089 int mntflags; 2090 }; 2091 2092 static int nfs_set_super(struct super_block *s, void *data) 2093 { 2094 struct nfs_sb_mountdata *sb_mntdata = data; 2095 struct nfs_server *server = sb_mntdata->server; 2096 int ret; 2097 2098 s->s_flags = sb_mntdata->mntflags; 2099 s->s_fs_info = server; 2100 ret = set_anon_super(s, server); 2101 if (ret == 0) 2102 server->s_dev = s->s_dev; 2103 return ret; 2104 } 2105 2106 static int nfs_compare_super_address(struct nfs_server *server1, 2107 struct nfs_server *server2) 2108 { 2109 struct sockaddr *sap1, *sap2; 2110 2111 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2112 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2113 2114 if (sap1->sa_family != sap2->sa_family) 2115 return 0; 2116 2117 switch (sap1->sa_family) { 2118 case AF_INET: { 2119 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2120 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2121 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2122 return 0; 2123 if (sin1->sin_port != sin2->sin_port) 2124 return 0; 2125 break; 2126 } 2127 case AF_INET6: { 2128 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2129 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2130 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2131 return 0; 2132 if (sin1->sin6_port != sin2->sin6_port) 2133 return 0; 2134 break; 2135 } 2136 default: 2137 return 0; 2138 } 2139 2140 return 1; 2141 } 2142 2143 static int nfs_compare_super(struct super_block *sb, void *data) 2144 { 2145 struct nfs_sb_mountdata *sb_mntdata = data; 2146 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2147 int mntflags = sb_mntdata->mntflags; 2148 2149 if (!nfs_compare_super_address(old, server)) 2150 return 0; 2151 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2152 if (old->flags & NFS_MOUNT_UNSHARED) 2153 return 0; 2154 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2155 return 0; 2156 return nfs_compare_mount_options(sb, server, mntflags); 2157 } 2158 2159 static int nfs_bdi_register(struct nfs_server *server) 2160 { 2161 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2162 } 2163 2164 static int nfs_get_sb(struct file_system_type *fs_type, 2165 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2166 { 2167 struct nfs_server *server = NULL; 2168 struct super_block *s; 2169 struct nfs_parsed_mount_data *data; 2170 struct nfs_fh *mntfh; 2171 struct dentry *mntroot; 2172 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2173 struct nfs_sb_mountdata sb_mntdata = { 2174 .mntflags = flags, 2175 }; 2176 int error = -ENOMEM; 2177 2178 data = nfs_alloc_parsed_mount_data(3); 2179 mntfh = nfs_alloc_fhandle(); 2180 if (data == NULL || mntfh == NULL) 2181 goto out_free_fh; 2182 2183 security_init_mnt_opts(&data->lsm_opts); 2184 2185 /* Validate the mount data */ 2186 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2187 if (error < 0) 2188 goto out; 2189 2190 #ifdef CONFIG_NFS_V4 2191 if (data->version == 4) { 2192 error = nfs4_try_mount(flags, dev_name, data, mnt); 2193 kfree(data->client_address); 2194 kfree(data->nfs_server.export_path); 2195 goto out; 2196 } 2197 #endif /* CONFIG_NFS_V4 */ 2198 2199 /* Get a volume representation */ 2200 server = nfs_create_server(data, mntfh); 2201 if (IS_ERR(server)) { 2202 error = PTR_ERR(server); 2203 goto out; 2204 } 2205 sb_mntdata.server = server; 2206 2207 if (server->flags & NFS_MOUNT_UNSHARED) 2208 compare_super = NULL; 2209 2210 /* Get a superblock - note that we may end up sharing one that already exists */ 2211 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2212 if (IS_ERR(s)) { 2213 error = PTR_ERR(s); 2214 goto out_err_nosb; 2215 } 2216 2217 if (s->s_fs_info != server) { 2218 nfs_free_server(server); 2219 server = NULL; 2220 } else { 2221 error = nfs_bdi_register(server); 2222 if (error) 2223 goto error_splat_bdi; 2224 } 2225 2226 if (!s->s_root) { 2227 /* initial superblock/root creation */ 2228 nfs_fill_super(s, data); 2229 nfs_fscache_get_super_cookie( 2230 s, data ? data->fscache_uniq : NULL, NULL); 2231 } 2232 2233 mntroot = nfs_get_root(s, mntfh); 2234 if (IS_ERR(mntroot)) { 2235 error = PTR_ERR(mntroot); 2236 goto error_splat_super; 2237 } 2238 2239 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2240 if (error) 2241 goto error_splat_root; 2242 2243 s->s_flags |= MS_ACTIVE; 2244 mnt->mnt_sb = s; 2245 mnt->mnt_root = mntroot; 2246 error = 0; 2247 2248 out: 2249 kfree(data->nfs_server.hostname); 2250 kfree(data->mount_server.hostname); 2251 kfree(data->fscache_uniq); 2252 security_free_mnt_opts(&data->lsm_opts); 2253 out_free_fh: 2254 nfs_free_fhandle(mntfh); 2255 kfree(data); 2256 return error; 2257 2258 out_err_nosb: 2259 nfs_free_server(server); 2260 goto out; 2261 2262 error_splat_root: 2263 dput(mntroot); 2264 error_splat_super: 2265 if (server && !s->s_root) 2266 bdi_unregister(&server->backing_dev_info); 2267 error_splat_bdi: 2268 deactivate_locked_super(s); 2269 goto out; 2270 } 2271 2272 /* 2273 * Ensure that we unregister the bdi before kill_anon_super 2274 * releases the device name 2275 */ 2276 static void nfs_put_super(struct super_block *s) 2277 { 2278 struct nfs_server *server = NFS_SB(s); 2279 2280 bdi_unregister(&server->backing_dev_info); 2281 } 2282 2283 /* 2284 * Destroy an NFS2/3 superblock 2285 */ 2286 static void nfs_kill_super(struct super_block *s) 2287 { 2288 struct nfs_server *server = NFS_SB(s); 2289 2290 kill_anon_super(s); 2291 nfs_fscache_release_super_cookie(s); 2292 nfs_free_server(server); 2293 } 2294 2295 /* 2296 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2297 */ 2298 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2299 const char *dev_name, void *raw_data, 2300 struct vfsmount *mnt) 2301 { 2302 struct nfs_clone_mount *data = raw_data; 2303 struct super_block *s; 2304 struct nfs_server *server; 2305 struct dentry *mntroot; 2306 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2307 struct nfs_sb_mountdata sb_mntdata = { 2308 .mntflags = flags, 2309 }; 2310 int error; 2311 2312 dprintk("--> nfs_xdev_get_sb()\n"); 2313 2314 /* create a new volume representation */ 2315 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2316 if (IS_ERR(server)) { 2317 error = PTR_ERR(server); 2318 goto out_err_noserver; 2319 } 2320 sb_mntdata.server = server; 2321 2322 if (server->flags & NFS_MOUNT_UNSHARED) 2323 compare_super = NULL; 2324 2325 /* Get a superblock - note that we may end up sharing one that already exists */ 2326 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2327 if (IS_ERR(s)) { 2328 error = PTR_ERR(s); 2329 goto out_err_nosb; 2330 } 2331 2332 if (s->s_fs_info != server) { 2333 nfs_free_server(server); 2334 server = NULL; 2335 } else { 2336 error = nfs_bdi_register(server); 2337 if (error) 2338 goto error_splat_bdi; 2339 } 2340 2341 if (!s->s_root) { 2342 /* initial superblock/root creation */ 2343 nfs_clone_super(s, data->sb); 2344 nfs_fscache_get_super_cookie(s, NULL, data); 2345 } 2346 2347 mntroot = nfs_get_root(s, data->fh); 2348 if (IS_ERR(mntroot)) { 2349 error = PTR_ERR(mntroot); 2350 goto error_splat_super; 2351 } 2352 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2353 dput(mntroot); 2354 error = -ESTALE; 2355 goto error_splat_super; 2356 } 2357 2358 s->s_flags |= MS_ACTIVE; 2359 mnt->mnt_sb = s; 2360 mnt->mnt_root = mntroot; 2361 2362 /* clone any lsm security options from the parent to the new sb */ 2363 security_sb_clone_mnt_opts(data->sb, s); 2364 2365 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2366 return 0; 2367 2368 out_err_nosb: 2369 nfs_free_server(server); 2370 out_err_noserver: 2371 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2372 return error; 2373 2374 error_splat_super: 2375 if (server && !s->s_root) 2376 bdi_unregister(&server->backing_dev_info); 2377 error_splat_bdi: 2378 deactivate_locked_super(s); 2379 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2380 return error; 2381 } 2382 2383 #ifdef CONFIG_NFS_V4 2384 2385 /* 2386 * Finish setting up a cloned NFS4 superblock 2387 */ 2388 static void nfs4_clone_super(struct super_block *sb, 2389 const struct super_block *old_sb) 2390 { 2391 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2392 sb->s_blocksize = old_sb->s_blocksize; 2393 sb->s_maxbytes = old_sb->s_maxbytes; 2394 sb->s_time_gran = 1; 2395 sb->s_op = old_sb->s_op; 2396 nfs_initialise_sb(sb); 2397 } 2398 2399 /* 2400 * Set up an NFS4 superblock 2401 */ 2402 static void nfs4_fill_super(struct super_block *sb) 2403 { 2404 sb->s_time_gran = 1; 2405 sb->s_op = &nfs4_sops; 2406 nfs_initialise_sb(sb); 2407 } 2408 2409 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2410 { 2411 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2412 } 2413 2414 static int nfs4_validate_text_mount_data(void *options, 2415 struct nfs_parsed_mount_data *args, 2416 const char *dev_name) 2417 { 2418 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2419 2420 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2421 2422 nfs_validate_transport_protocol(args); 2423 2424 nfs4_validate_mount_flags(args); 2425 2426 if (args->version != 4) { 2427 dfprintk(MOUNT, 2428 "NFS4: Illegal mount version\n"); 2429 return -EINVAL; 2430 } 2431 2432 if (args->auth_flavor_len > 1) { 2433 dfprintk(MOUNT, 2434 "NFS4: Too many RPC auth flavours specified\n"); 2435 return -EINVAL; 2436 } 2437 2438 if (args->client_address == NULL) { 2439 dfprintk(MOUNT, 2440 "NFS4: mount program didn't pass callback address\n"); 2441 return -EINVAL; 2442 } 2443 2444 return nfs_parse_devname(dev_name, 2445 &args->nfs_server.hostname, 2446 NFS4_MAXNAMLEN, 2447 &args->nfs_server.export_path, 2448 NFS4_MAXPATHLEN); 2449 } 2450 2451 /* 2452 * Validate NFSv4 mount options 2453 */ 2454 static int nfs4_validate_mount_data(void *options, 2455 struct nfs_parsed_mount_data *args, 2456 const char *dev_name) 2457 { 2458 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2459 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2460 char *c; 2461 2462 if (data == NULL) 2463 goto out_no_data; 2464 2465 switch (data->version) { 2466 case 1: 2467 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2468 goto out_no_address; 2469 if (data->host_addrlen == 0) 2470 goto out_no_address; 2471 args->nfs_server.addrlen = data->host_addrlen; 2472 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2473 return -EFAULT; 2474 if (!nfs_verify_server_address(sap)) 2475 goto out_no_address; 2476 2477 if (data->auth_flavourlen) { 2478 if (data->auth_flavourlen > 1) 2479 goto out_inval_auth; 2480 if (copy_from_user(&args->auth_flavors[0], 2481 data->auth_flavours, 2482 sizeof(args->auth_flavors[0]))) 2483 return -EFAULT; 2484 } 2485 2486 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2487 if (IS_ERR(c)) 2488 return PTR_ERR(c); 2489 args->nfs_server.hostname = c; 2490 2491 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2492 if (IS_ERR(c)) 2493 return PTR_ERR(c); 2494 args->nfs_server.export_path = c; 2495 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2496 2497 c = strndup_user(data->client_addr.data, 16); 2498 if (IS_ERR(c)) 2499 return PTR_ERR(c); 2500 args->client_address = c; 2501 2502 /* 2503 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2504 * can deal with. 2505 */ 2506 2507 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2508 args->rsize = data->rsize; 2509 args->wsize = data->wsize; 2510 args->timeo = data->timeo; 2511 args->retrans = data->retrans; 2512 args->acregmin = data->acregmin; 2513 args->acregmax = data->acregmax; 2514 args->acdirmin = data->acdirmin; 2515 args->acdirmax = data->acdirmax; 2516 args->nfs_server.protocol = data->proto; 2517 nfs_validate_transport_protocol(args); 2518 2519 break; 2520 default: 2521 if (nfs_parse_mount_options((char *)options, args) == 0) 2522 return -EINVAL; 2523 2524 if (!nfs_verify_server_address(sap)) 2525 return -EINVAL; 2526 2527 return nfs4_validate_text_mount_data(options, args, dev_name); 2528 } 2529 2530 return 0; 2531 2532 out_no_data: 2533 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2534 return -EINVAL; 2535 2536 out_inval_auth: 2537 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2538 data->auth_flavourlen); 2539 return -EINVAL; 2540 2541 out_no_address: 2542 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2543 return -EINVAL; 2544 } 2545 2546 /* 2547 * Get the superblock for the NFS4 root partition 2548 */ 2549 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2550 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2551 { 2552 struct nfs_parsed_mount_data *data = raw_data; 2553 struct super_block *s; 2554 struct nfs_server *server; 2555 struct nfs_fh *mntfh; 2556 struct dentry *mntroot; 2557 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2558 struct nfs_sb_mountdata sb_mntdata = { 2559 .mntflags = flags, 2560 }; 2561 int error = -ENOMEM; 2562 2563 mntfh = nfs_alloc_fhandle(); 2564 if (data == NULL || mntfh == NULL) 2565 goto out_free_fh; 2566 2567 security_init_mnt_opts(&data->lsm_opts); 2568 2569 /* Get a volume representation */ 2570 server = nfs4_create_server(data, mntfh); 2571 if (IS_ERR(server)) { 2572 error = PTR_ERR(server); 2573 goto out; 2574 } 2575 sb_mntdata.server = server; 2576 2577 if (server->flags & NFS4_MOUNT_UNSHARED) 2578 compare_super = NULL; 2579 2580 /* Get a superblock - note that we may end up sharing one that already exists */ 2581 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2582 if (IS_ERR(s)) { 2583 error = PTR_ERR(s); 2584 goto out_free; 2585 } 2586 2587 if (s->s_fs_info != server) { 2588 nfs_free_server(server); 2589 server = NULL; 2590 } else { 2591 error = nfs_bdi_register(server); 2592 if (error) 2593 goto error_splat_bdi; 2594 } 2595 2596 if (!s->s_root) { 2597 /* initial superblock/root creation */ 2598 nfs4_fill_super(s); 2599 nfs_fscache_get_super_cookie( 2600 s, data ? data->fscache_uniq : NULL, NULL); 2601 } 2602 2603 mntroot = nfs4_get_root(s, mntfh); 2604 if (IS_ERR(mntroot)) { 2605 error = PTR_ERR(mntroot); 2606 goto error_splat_super; 2607 } 2608 2609 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2610 if (error) 2611 goto error_splat_root; 2612 2613 s->s_flags |= MS_ACTIVE; 2614 mnt->mnt_sb = s; 2615 mnt->mnt_root = mntroot; 2616 error = 0; 2617 2618 out: 2619 security_free_mnt_opts(&data->lsm_opts); 2620 out_free_fh: 2621 nfs_free_fhandle(mntfh); 2622 return error; 2623 2624 out_free: 2625 nfs_free_server(server); 2626 goto out; 2627 2628 error_splat_root: 2629 dput(mntroot); 2630 error_splat_super: 2631 if (server && !s->s_root) 2632 bdi_unregister(&server->backing_dev_info); 2633 error_splat_bdi: 2634 deactivate_locked_super(s); 2635 goto out; 2636 } 2637 2638 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2639 int flags, void *data, const char *hostname) 2640 { 2641 struct vfsmount *root_mnt; 2642 char *root_devname; 2643 size_t len; 2644 2645 len = strlen(hostname) + 3; 2646 root_devname = kmalloc(len, GFP_KERNEL); 2647 if (root_devname == NULL) 2648 return ERR_PTR(-ENOMEM); 2649 snprintf(root_devname, len, "%s:/", hostname); 2650 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2651 kfree(root_devname); 2652 return root_mnt; 2653 } 2654 2655 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2656 { 2657 char *page = (char *) __get_free_page(GFP_KERNEL); 2658 char *devname, *tmp; 2659 2660 if (page == NULL) 2661 return; 2662 devname = nfs_path(path->mnt->mnt_devname, 2663 path->mnt->mnt_root, path->dentry, 2664 page, PAGE_SIZE); 2665 if (IS_ERR(devname)) 2666 goto out_freepage; 2667 tmp = kstrdup(devname, GFP_KERNEL); 2668 if (tmp == NULL) 2669 goto out_freepage; 2670 kfree(mnt->mnt_devname); 2671 mnt->mnt_devname = tmp; 2672 out_freepage: 2673 free_page((unsigned long)page); 2674 } 2675 2676 struct nfs_referral_count { 2677 struct list_head list; 2678 const struct task_struct *task; 2679 unsigned int referral_count; 2680 }; 2681 2682 static LIST_HEAD(nfs_referral_count_list); 2683 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2684 2685 static struct nfs_referral_count *nfs_find_referral_count(void) 2686 { 2687 struct nfs_referral_count *p; 2688 2689 list_for_each_entry(p, &nfs_referral_count_list, list) { 2690 if (p->task == current) 2691 return p; 2692 } 2693 return NULL; 2694 } 2695 2696 #define NFS_MAX_NESTED_REFERRALS 2 2697 2698 static int nfs_referral_loop_protect(void) 2699 { 2700 struct nfs_referral_count *p, *new; 2701 int ret = -ENOMEM; 2702 2703 new = kmalloc(sizeof(*new), GFP_KERNEL); 2704 if (!new) 2705 goto out; 2706 new->task = current; 2707 new->referral_count = 1; 2708 2709 ret = 0; 2710 spin_lock(&nfs_referral_count_list_lock); 2711 p = nfs_find_referral_count(); 2712 if (p != NULL) { 2713 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2714 ret = -ELOOP; 2715 else 2716 p->referral_count++; 2717 } else { 2718 list_add(&new->list, &nfs_referral_count_list); 2719 new = NULL; 2720 } 2721 spin_unlock(&nfs_referral_count_list_lock); 2722 kfree(new); 2723 out: 2724 return ret; 2725 } 2726 2727 static void nfs_referral_loop_unprotect(void) 2728 { 2729 struct nfs_referral_count *p; 2730 2731 spin_lock(&nfs_referral_count_list_lock); 2732 p = nfs_find_referral_count(); 2733 p->referral_count--; 2734 if (p->referral_count == 0) 2735 list_del(&p->list); 2736 else 2737 p = NULL; 2738 spin_unlock(&nfs_referral_count_list_lock); 2739 kfree(p); 2740 } 2741 2742 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2743 const char *export_path, struct vfsmount *mnt_target) 2744 { 2745 struct nameidata *nd = NULL; 2746 struct mnt_namespace *ns_private; 2747 struct super_block *s; 2748 int ret; 2749 2750 nd = kmalloc(sizeof(*nd), GFP_KERNEL); 2751 if (nd == NULL) 2752 return -ENOMEM; 2753 2754 ns_private = create_mnt_ns(root_mnt); 2755 ret = PTR_ERR(ns_private); 2756 if (IS_ERR(ns_private)) 2757 goto out_mntput; 2758 2759 ret = nfs_referral_loop_protect(); 2760 if (ret != 0) 2761 goto out_put_mnt_ns; 2762 2763 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2764 export_path, LOOKUP_FOLLOW, nd); 2765 2766 nfs_referral_loop_unprotect(); 2767 put_mnt_ns(ns_private); 2768 2769 if (ret != 0) 2770 goto out_err; 2771 2772 s = nd->path.mnt->mnt_sb; 2773 atomic_inc(&s->s_active); 2774 mnt_target->mnt_sb = s; 2775 mnt_target->mnt_root = dget(nd->path.dentry); 2776 2777 /* Correct the device pathname */ 2778 nfs_fix_devname(&nd->path, mnt_target); 2779 2780 path_put(&nd->path); 2781 kfree(nd); 2782 down_write(&s->s_umount); 2783 return 0; 2784 out_put_mnt_ns: 2785 put_mnt_ns(ns_private); 2786 out_mntput: 2787 mntput(root_mnt); 2788 out_err: 2789 kfree(nd); 2790 return ret; 2791 } 2792 2793 static int nfs4_try_mount(int flags, const char *dev_name, 2794 struct nfs_parsed_mount_data *data, 2795 struct vfsmount *mnt) 2796 { 2797 char *export_path; 2798 struct vfsmount *root_mnt; 2799 int error; 2800 2801 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2802 2803 export_path = data->nfs_server.export_path; 2804 data->nfs_server.export_path = "/"; 2805 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2806 data->nfs_server.hostname); 2807 data->nfs_server.export_path = export_path; 2808 2809 error = PTR_ERR(root_mnt); 2810 if (IS_ERR(root_mnt)) 2811 goto out; 2812 2813 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2814 2815 out: 2816 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2817 error != 0 ? " [error]" : ""); 2818 return error; 2819 } 2820 2821 /* 2822 * Get the superblock for an NFS4 mountpoint 2823 */ 2824 static int nfs4_get_sb(struct file_system_type *fs_type, 2825 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2826 { 2827 struct nfs_parsed_mount_data *data; 2828 int error = -ENOMEM; 2829 2830 data = nfs_alloc_parsed_mount_data(4); 2831 if (data == NULL) 2832 goto out_free_data; 2833 2834 /* Validate the mount data */ 2835 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2836 if (error < 0) 2837 goto out; 2838 2839 error = nfs4_try_mount(flags, dev_name, data, mnt); 2840 2841 out: 2842 kfree(data->client_address); 2843 kfree(data->nfs_server.export_path); 2844 kfree(data->nfs_server.hostname); 2845 kfree(data->fscache_uniq); 2846 out_free_data: 2847 kfree(data); 2848 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2849 error != 0 ? " [error]" : ""); 2850 return error; 2851 } 2852 2853 static void nfs4_kill_super(struct super_block *sb) 2854 { 2855 struct nfs_server *server = NFS_SB(sb); 2856 2857 dprintk("--> %s\n", __func__); 2858 nfs_super_return_all_delegations(sb); 2859 kill_anon_super(sb); 2860 nfs_fscache_release_super_cookie(sb); 2861 nfs_free_server(server); 2862 dprintk("<-- %s\n", __func__); 2863 } 2864 2865 /* 2866 * Clone an NFS4 server record on xdev traversal (FSID-change) 2867 */ 2868 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2869 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 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2877 struct nfs_sb_mountdata sb_mntdata = { 2878 .mntflags = flags, 2879 }; 2880 int error; 2881 2882 dprintk("--> nfs4_xdev_get_sb()\n"); 2883 2884 /* create a new volume representation */ 2885 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2886 if (IS_ERR(server)) { 2887 error = PTR_ERR(server); 2888 goto out_err_noserver; 2889 } 2890 sb_mntdata.server = server; 2891 2892 if (server->flags & NFS4_MOUNT_UNSHARED) 2893 compare_super = NULL; 2894 2895 /* Get a superblock - note that we may end up sharing one that already exists */ 2896 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2897 if (IS_ERR(s)) { 2898 error = PTR_ERR(s); 2899 goto out_err_nosb; 2900 } 2901 2902 if (s->s_fs_info != server) { 2903 nfs_free_server(server); 2904 server = NULL; 2905 } else { 2906 error = nfs_bdi_register(server); 2907 if (error) 2908 goto error_splat_bdi; 2909 } 2910 2911 if (!s->s_root) { 2912 /* initial superblock/root creation */ 2913 nfs4_clone_super(s, data->sb); 2914 nfs_fscache_get_super_cookie(s, NULL, data); 2915 } 2916 2917 mntroot = nfs4_get_root(s, data->fh); 2918 if (IS_ERR(mntroot)) { 2919 error = PTR_ERR(mntroot); 2920 goto error_splat_super; 2921 } 2922 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2923 dput(mntroot); 2924 error = -ESTALE; 2925 goto error_splat_super; 2926 } 2927 2928 s->s_flags |= MS_ACTIVE; 2929 mnt->mnt_sb = s; 2930 mnt->mnt_root = mntroot; 2931 2932 security_sb_clone_mnt_opts(data->sb, s); 2933 2934 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 2935 return 0; 2936 2937 out_err_nosb: 2938 nfs_free_server(server); 2939 out_err_noserver: 2940 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2941 return error; 2942 2943 error_splat_super: 2944 if (server && !s->s_root) 2945 bdi_unregister(&server->backing_dev_info); 2946 error_splat_bdi: 2947 deactivate_locked_super(s); 2948 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2949 return error; 2950 } 2951 2952 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2953 int flags, const char *dev_name, void *raw_data, 2954 struct vfsmount *mnt) 2955 { 2956 struct nfs_clone_mount *data = raw_data; 2957 struct super_block *s; 2958 struct nfs_server *server; 2959 struct dentry *mntroot; 2960 struct nfs_fh *mntfh; 2961 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2962 struct nfs_sb_mountdata sb_mntdata = { 2963 .mntflags = flags, 2964 }; 2965 int error = -ENOMEM; 2966 2967 dprintk("--> nfs4_referral_get_sb()\n"); 2968 2969 mntfh = nfs_alloc_fhandle(); 2970 if (mntfh == NULL) 2971 goto out_err_nofh; 2972 2973 /* create a new volume representation */ 2974 server = nfs4_create_referral_server(data, mntfh); 2975 if (IS_ERR(server)) { 2976 error = PTR_ERR(server); 2977 goto out_err_noserver; 2978 } 2979 sb_mntdata.server = server; 2980 2981 if (server->flags & NFS4_MOUNT_UNSHARED) 2982 compare_super = NULL; 2983 2984 /* Get a superblock - note that we may end up sharing one that already exists */ 2985 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2986 if (IS_ERR(s)) { 2987 error = PTR_ERR(s); 2988 goto out_err_nosb; 2989 } 2990 2991 if (s->s_fs_info != server) { 2992 nfs_free_server(server); 2993 server = NULL; 2994 } else { 2995 error = nfs_bdi_register(server); 2996 if (error) 2997 goto error_splat_bdi; 2998 } 2999 3000 if (!s->s_root) { 3001 /* initial superblock/root creation */ 3002 nfs4_fill_super(s); 3003 nfs_fscache_get_super_cookie(s, NULL, data); 3004 } 3005 3006 mntroot = nfs4_get_root(s, mntfh); 3007 if (IS_ERR(mntroot)) { 3008 error = PTR_ERR(mntroot); 3009 goto error_splat_super; 3010 } 3011 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3012 dput(mntroot); 3013 error = -ESTALE; 3014 goto error_splat_super; 3015 } 3016 3017 s->s_flags |= MS_ACTIVE; 3018 mnt->mnt_sb = s; 3019 mnt->mnt_root = mntroot; 3020 3021 security_sb_clone_mnt_opts(data->sb, s); 3022 3023 nfs_free_fhandle(mntfh); 3024 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3025 return 0; 3026 3027 out_err_nosb: 3028 nfs_free_server(server); 3029 out_err_noserver: 3030 nfs_free_fhandle(mntfh); 3031 out_err_nofh: 3032 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3033 return error; 3034 3035 error_splat_super: 3036 if (server && !s->s_root) 3037 bdi_unregister(&server->backing_dev_info); 3038 error_splat_bdi: 3039 deactivate_locked_super(s); 3040 nfs_free_fhandle(mntfh); 3041 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3042 return error; 3043 } 3044 3045 /* 3046 * Create an NFS4 server record on referral traversal 3047 */ 3048 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 3049 int flags, const char *dev_name, void *raw_data, 3050 struct vfsmount *mnt) 3051 { 3052 struct nfs_clone_mount *data = raw_data; 3053 char *export_path; 3054 struct vfsmount *root_mnt; 3055 int error; 3056 3057 dprintk("--> nfs4_referral_get_sb()\n"); 3058 3059 export_path = data->mnt_path; 3060 data->mnt_path = "/"; 3061 3062 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3063 flags, data, data->hostname); 3064 data->mnt_path = export_path; 3065 3066 error = PTR_ERR(root_mnt); 3067 if (IS_ERR(root_mnt)) 3068 goto out; 3069 3070 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 3071 out: 3072 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 3073 error != 0 ? " [error]" : ""); 3074 return error; 3075 } 3076 3077 #endif /* CONFIG_NFS_V4 */ 3078