1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/smp_lock.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/mnt_namespace.h> 46 #include <linux/namei.h> 47 #include <linux/nfs_idmap.h> 48 #include <linux/vfs.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <net/ipv6.h> 52 #include <linux/netdevice.h> 53 #include <linux/nfs_xdr.h> 54 #include <linux/magic.h> 55 #include <linux/parser.h> 56 57 #include <asm/system.h> 58 #include <asm/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 67 #define NFSDBG_FACILITY NFSDBG_VFS 68 69 enum { 70 /* Mount options that take no arguments */ 71 Opt_soft, Opt_hard, 72 Opt_posix, Opt_noposix, 73 Opt_cto, Opt_nocto, 74 Opt_ac, Opt_noac, 75 Opt_lock, Opt_nolock, 76 Opt_v2, Opt_v3, Opt_v4, 77 Opt_udp, Opt_tcp, Opt_rdma, 78 Opt_acl, Opt_noacl, 79 Opt_rdirplus, Opt_nordirplus, 80 Opt_sharecache, Opt_nosharecache, 81 Opt_resvport, Opt_noresvport, 82 Opt_fscache, Opt_nofscache, 83 84 /* Mount options that take integer arguments */ 85 Opt_port, 86 Opt_rsize, Opt_wsize, Opt_bsize, 87 Opt_timeo, Opt_retrans, 88 Opt_acregmin, Opt_acregmax, 89 Opt_acdirmin, Opt_acdirmax, 90 Opt_actimeo, 91 Opt_namelen, 92 Opt_mountport, 93 Opt_mountvers, 94 Opt_nfsvers, 95 Opt_minorversion, 96 97 /* Mount options that take string arguments */ 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 99 Opt_addr, Opt_mountaddr, Opt_clientaddr, 100 Opt_lookupcache, 101 Opt_fscache_uniq, 102 103 /* Special mount options */ 104 Opt_userspace, Opt_deprecated, Opt_sloppy, 105 106 Opt_err 107 }; 108 109 static const match_table_t nfs_mount_option_tokens = { 110 { Opt_userspace, "bg" }, 111 { Opt_userspace, "fg" }, 112 { Opt_userspace, "retry=%s" }, 113 114 { Opt_sloppy, "sloppy" }, 115 116 { Opt_soft, "soft" }, 117 { Opt_hard, "hard" }, 118 { Opt_deprecated, "intr" }, 119 { Opt_deprecated, "nointr" }, 120 { Opt_posix, "posix" }, 121 { Opt_noposix, "noposix" }, 122 { Opt_cto, "cto" }, 123 { Opt_nocto, "nocto" }, 124 { Opt_ac, "ac" }, 125 { Opt_noac, "noac" }, 126 { Opt_lock, "lock" }, 127 { Opt_nolock, "nolock" }, 128 { Opt_v2, "v2" }, 129 { Opt_v3, "v3" }, 130 { Opt_v4, "v4" }, 131 { Opt_udp, "udp" }, 132 { Opt_tcp, "tcp" }, 133 { Opt_rdma, "rdma" }, 134 { Opt_acl, "acl" }, 135 { Opt_noacl, "noacl" }, 136 { Opt_rdirplus, "rdirplus" }, 137 { Opt_nordirplus, "nordirplus" }, 138 { Opt_sharecache, "sharecache" }, 139 { Opt_nosharecache, "nosharecache" }, 140 { Opt_resvport, "resvport" }, 141 { Opt_noresvport, "noresvport" }, 142 { Opt_fscache, "fsc" }, 143 { Opt_fscache_uniq, "fsc=%s" }, 144 { Opt_nofscache, "nofsc" }, 145 146 { Opt_port, "port=%s" }, 147 { Opt_rsize, "rsize=%s" }, 148 { Opt_wsize, "wsize=%s" }, 149 { Opt_bsize, "bsize=%s" }, 150 { Opt_timeo, "timeo=%s" }, 151 { Opt_retrans, "retrans=%s" }, 152 { Opt_acregmin, "acregmin=%s" }, 153 { Opt_acregmax, "acregmax=%s" }, 154 { Opt_acdirmin, "acdirmin=%s" }, 155 { Opt_acdirmax, "acdirmax=%s" }, 156 { Opt_actimeo, "actimeo=%s" }, 157 { Opt_namelen, "namlen=%s" }, 158 { Opt_mountport, "mountport=%s" }, 159 { Opt_mountvers, "mountvers=%s" }, 160 { Opt_nfsvers, "nfsvers=%s" }, 161 { Opt_nfsvers, "vers=%s" }, 162 { Opt_minorversion, "minorversion=%s" }, 163 164 { Opt_sec, "sec=%s" }, 165 { Opt_proto, "proto=%s" }, 166 { Opt_mountproto, "mountproto=%s" }, 167 { Opt_addr, "addr=%s" }, 168 { Opt_clientaddr, "clientaddr=%s" }, 169 { Opt_mounthost, "mounthost=%s" }, 170 { Opt_mountaddr, "mountaddr=%s" }, 171 172 { Opt_lookupcache, "lookupcache=%s" }, 173 174 { Opt_err, NULL } 175 }; 176 177 enum { 178 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 179 180 Opt_xprt_err 181 }; 182 183 static const match_table_t nfs_xprt_protocol_tokens = { 184 { Opt_xprt_udp, "udp" }, 185 { Opt_xprt_udp6, "udp6" }, 186 { Opt_xprt_tcp, "tcp" }, 187 { Opt_xprt_tcp6, "tcp6" }, 188 { Opt_xprt_rdma, "rdma" }, 189 190 { Opt_xprt_err, NULL } 191 }; 192 193 enum { 194 Opt_sec_none, Opt_sec_sys, 195 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 196 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 197 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 198 199 Opt_sec_err 200 }; 201 202 static const match_table_t nfs_secflavor_tokens = { 203 { Opt_sec_none, "none" }, 204 { Opt_sec_none, "null" }, 205 { Opt_sec_sys, "sys" }, 206 207 { Opt_sec_krb5, "krb5" }, 208 { Opt_sec_krb5i, "krb5i" }, 209 { Opt_sec_krb5p, "krb5p" }, 210 211 { Opt_sec_lkey, "lkey" }, 212 { Opt_sec_lkeyi, "lkeyi" }, 213 { Opt_sec_lkeyp, "lkeyp" }, 214 215 { Opt_sec_spkm, "spkm3" }, 216 { Opt_sec_spkmi, "spkm3i" }, 217 { Opt_sec_spkmp, "spkm3p" }, 218 219 { Opt_sec_err, NULL } 220 }; 221 222 enum { 223 Opt_lookupcache_all, Opt_lookupcache_positive, 224 Opt_lookupcache_none, 225 226 Opt_lookupcache_err 227 }; 228 229 static match_table_t nfs_lookupcache_tokens = { 230 { Opt_lookupcache_all, "all" }, 231 { Opt_lookupcache_positive, "pos" }, 232 { Opt_lookupcache_positive, "positive" }, 233 { Opt_lookupcache_none, "none" }, 234 235 { Opt_lookupcache_err, NULL } 236 }; 237 238 239 static void nfs_umount_begin(struct super_block *); 240 static int nfs_statfs(struct dentry *, struct kstatfs *); 241 static int nfs_show_options(struct seq_file *, struct vfsmount *); 242 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 243 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 244 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 246 static void nfs_put_super(struct super_block *); 247 static void nfs_kill_super(struct super_block *); 248 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 249 250 static struct file_system_type nfs_fs_type = { 251 .owner = THIS_MODULE, 252 .name = "nfs", 253 .get_sb = nfs_get_sb, 254 .kill_sb = nfs_kill_super, 255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 256 }; 257 258 struct file_system_type nfs_xdev_fs_type = { 259 .owner = THIS_MODULE, 260 .name = "nfs", 261 .get_sb = nfs_xdev_get_sb, 262 .kill_sb = nfs_kill_super, 263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 264 }; 265 266 static const struct super_operations nfs_sops = { 267 .alloc_inode = nfs_alloc_inode, 268 .destroy_inode = nfs_destroy_inode, 269 .write_inode = nfs_write_inode, 270 .put_super = nfs_put_super, 271 .statfs = nfs_statfs, 272 .clear_inode = nfs_clear_inode, 273 .umount_begin = nfs_umount_begin, 274 .show_options = nfs_show_options, 275 .show_stats = nfs_show_stats, 276 .remount_fs = nfs_remount, 277 }; 278 279 #ifdef CONFIG_NFS_V4 280 static int nfs4_validate_text_mount_data(void *options, 281 struct nfs_parsed_mount_data *args, const char *dev_name); 282 static int nfs4_try_mount(int flags, const char *dev_name, 283 struct nfs_parsed_mount_data *data, struct vfsmount *mnt); 284 static int nfs4_get_sb(struct file_system_type *fs_type, 285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 286 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 288 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 290 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 291 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 292 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 293 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 294 static void nfs4_kill_super(struct super_block *sb); 295 296 static struct file_system_type nfs4_fs_type = { 297 .owner = THIS_MODULE, 298 .name = "nfs4", 299 .get_sb = nfs4_get_sb, 300 .kill_sb = nfs4_kill_super, 301 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 302 }; 303 304 static struct file_system_type nfs4_remote_fs_type = { 305 .owner = THIS_MODULE, 306 .name = "nfs4", 307 .get_sb = nfs4_remote_get_sb, 308 .kill_sb = nfs4_kill_super, 309 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 310 }; 311 312 struct file_system_type nfs4_xdev_fs_type = { 313 .owner = THIS_MODULE, 314 .name = "nfs4", 315 .get_sb = nfs4_xdev_get_sb, 316 .kill_sb = nfs4_kill_super, 317 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 318 }; 319 320 static struct file_system_type nfs4_remote_referral_fs_type = { 321 .owner = THIS_MODULE, 322 .name = "nfs4", 323 .get_sb = nfs4_remote_referral_get_sb, 324 .kill_sb = nfs4_kill_super, 325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 326 }; 327 328 struct file_system_type nfs4_referral_fs_type = { 329 .owner = THIS_MODULE, 330 .name = "nfs4", 331 .get_sb = nfs4_referral_get_sb, 332 .kill_sb = nfs4_kill_super, 333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 334 }; 335 336 static const struct super_operations nfs4_sops = { 337 .alloc_inode = nfs_alloc_inode, 338 .destroy_inode = nfs_destroy_inode, 339 .write_inode = nfs_write_inode, 340 .put_super = nfs_put_super, 341 .statfs = nfs_statfs, 342 .clear_inode = nfs4_clear_inode, 343 .umount_begin = nfs_umount_begin, 344 .show_options = nfs_show_options, 345 .show_stats = nfs_show_stats, 346 .remount_fs = nfs_remount, 347 }; 348 #endif 349 350 static struct shrinker acl_shrinker = { 351 .shrink = nfs_access_cache_shrinker, 352 .seeks = DEFAULT_SEEKS, 353 }; 354 355 /* 356 * Register the NFS filesystems 357 */ 358 int __init register_nfs_fs(void) 359 { 360 int ret; 361 362 ret = register_filesystem(&nfs_fs_type); 363 if (ret < 0) 364 goto error_0; 365 366 ret = nfs_register_sysctl(); 367 if (ret < 0) 368 goto error_1; 369 #ifdef CONFIG_NFS_V4 370 ret = register_filesystem(&nfs4_fs_type); 371 if (ret < 0) 372 goto error_2; 373 #endif 374 register_shrinker(&acl_shrinker); 375 return 0; 376 377 #ifdef CONFIG_NFS_V4 378 error_2: 379 nfs_unregister_sysctl(); 380 #endif 381 error_1: 382 unregister_filesystem(&nfs_fs_type); 383 error_0: 384 return ret; 385 } 386 387 /* 388 * Unregister the NFS filesystems 389 */ 390 void __exit unregister_nfs_fs(void) 391 { 392 unregister_shrinker(&acl_shrinker); 393 #ifdef CONFIG_NFS_V4 394 unregister_filesystem(&nfs4_fs_type); 395 #endif 396 nfs_unregister_sysctl(); 397 unregister_filesystem(&nfs_fs_type); 398 } 399 400 void nfs_sb_active(struct super_block *sb) 401 { 402 struct nfs_server *server = NFS_SB(sb); 403 404 if (atomic_inc_return(&server->active) == 1) 405 atomic_inc(&sb->s_active); 406 } 407 408 void nfs_sb_deactive(struct super_block *sb) 409 { 410 struct nfs_server *server = NFS_SB(sb); 411 412 if (atomic_dec_and_test(&server->active)) 413 deactivate_super(sb); 414 } 415 416 /* 417 * Deliver file system statistics to userspace 418 */ 419 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 420 { 421 struct nfs_server *server = NFS_SB(dentry->d_sb); 422 unsigned char blockbits; 423 unsigned long blockres; 424 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 425 struct nfs_fattr fattr; 426 struct nfs_fsstat res = { 427 .fattr = &fattr, 428 }; 429 int error; 430 431 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 432 if (error < 0) 433 goto out_err; 434 buf->f_type = NFS_SUPER_MAGIC; 435 436 /* 437 * Current versions of glibc do not correctly handle the 438 * case where f_frsize != f_bsize. Eventually we want to 439 * report the value of wtmult in this field. 440 */ 441 buf->f_frsize = dentry->d_sb->s_blocksize; 442 443 /* 444 * On most *nix systems, f_blocks, f_bfree, and f_bavail 445 * are reported in units of f_frsize. Linux hasn't had 446 * an f_frsize field in its statfs struct until recently, 447 * thus historically Linux's sys_statfs reports these 448 * fields in units of f_bsize. 449 */ 450 buf->f_bsize = dentry->d_sb->s_blocksize; 451 blockbits = dentry->d_sb->s_blocksize_bits; 452 blockres = (1 << blockbits) - 1; 453 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 454 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 455 buf->f_bavail = (res.abytes + blockres) >> blockbits; 456 457 buf->f_files = res.tfiles; 458 buf->f_ffree = res.afiles; 459 460 buf->f_namelen = server->namelen; 461 462 return 0; 463 464 out_err: 465 dprintk("%s: statfs error = %d\n", __func__, -error); 466 return error; 467 } 468 469 /* 470 * Map the security flavour number to a name 471 */ 472 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 473 { 474 static const struct { 475 rpc_authflavor_t flavour; 476 const char *str; 477 } sec_flavours[] = { 478 { RPC_AUTH_NULL, "null" }, 479 { RPC_AUTH_UNIX, "sys" }, 480 { RPC_AUTH_GSS_KRB5, "krb5" }, 481 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 482 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 483 { RPC_AUTH_GSS_LKEY, "lkey" }, 484 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 485 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 486 { RPC_AUTH_GSS_SPKM, "spkm" }, 487 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 488 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 489 { UINT_MAX, "unknown" } 490 }; 491 int i; 492 493 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 494 if (sec_flavours[i].flavour == flavour) 495 break; 496 } 497 return sec_flavours[i].str; 498 } 499 500 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 501 int showdefaults) 502 { 503 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 504 505 seq_printf(m, ",mountproto="); 506 switch (sap->sa_family) { 507 case AF_INET: 508 switch (nfss->mountd_protocol) { 509 case IPPROTO_UDP: 510 seq_printf(m, RPCBIND_NETID_UDP); 511 break; 512 case IPPROTO_TCP: 513 seq_printf(m, RPCBIND_NETID_TCP); 514 break; 515 default: 516 if (showdefaults) 517 seq_printf(m, "auto"); 518 } 519 break; 520 case AF_INET6: 521 switch (nfss->mountd_protocol) { 522 case IPPROTO_UDP: 523 seq_printf(m, RPCBIND_NETID_UDP6); 524 break; 525 case IPPROTO_TCP: 526 seq_printf(m, RPCBIND_NETID_TCP6); 527 break; 528 default: 529 if (showdefaults) 530 seq_printf(m, "auto"); 531 } 532 break; 533 default: 534 if (showdefaults) 535 seq_printf(m, "auto"); 536 } 537 } 538 539 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 540 int showdefaults) 541 { 542 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 543 544 switch (sap->sa_family) { 545 case AF_INET: { 546 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 547 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 548 break; 549 } 550 case AF_INET6: { 551 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 552 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 553 break; 554 } 555 default: 556 if (showdefaults) 557 seq_printf(m, ",mountaddr=unspecified"); 558 } 559 560 if (nfss->mountd_version || showdefaults) 561 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 562 if (nfss->mountd_port || showdefaults) 563 seq_printf(m, ",mountport=%u", nfss->mountd_port); 564 565 nfs_show_mountd_netid(m, nfss, showdefaults); 566 } 567 568 /* 569 * Describe the mount options in force on this server representation 570 */ 571 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 572 int showdefaults) 573 { 574 static const struct proc_nfs_info { 575 int flag; 576 const char *str; 577 const char *nostr; 578 } nfs_info[] = { 579 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 580 { NFS_MOUNT_POSIX, ",posix", "" }, 581 { NFS_MOUNT_NOCTO, ",nocto", "" }, 582 { NFS_MOUNT_NOAC, ",noac", "" }, 583 { NFS_MOUNT_NONLM, ",nolock", "" }, 584 { NFS_MOUNT_NOACL, ",noacl", "" }, 585 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 586 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 587 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 588 { 0, NULL, NULL } 589 }; 590 const struct proc_nfs_info *nfs_infop; 591 struct nfs_client *clp = nfss->nfs_client; 592 u32 version = clp->rpc_ops->version; 593 594 seq_printf(m, ",vers=%u", version); 595 seq_printf(m, ",rsize=%u", nfss->rsize); 596 seq_printf(m, ",wsize=%u", nfss->wsize); 597 if (nfss->bsize != 0) 598 seq_printf(m, ",bsize=%u", nfss->bsize); 599 seq_printf(m, ",namlen=%u", nfss->namelen); 600 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 601 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 602 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 603 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 604 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 605 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 606 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 607 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 608 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 609 if (nfss->flags & nfs_infop->flag) 610 seq_puts(m, nfs_infop->str); 611 else 612 seq_puts(m, nfs_infop->nostr); 613 } 614 seq_printf(m, ",proto=%s", 615 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 616 if (version == 4) { 617 if (nfss->port != NFS_PORT) 618 seq_printf(m, ",port=%u", nfss->port); 619 } else 620 if (nfss->port) 621 seq_printf(m, ",port=%u", nfss->port); 622 623 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 624 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 625 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 626 627 if (version != 4) 628 nfs_show_mountd_options(m, nfss, showdefaults); 629 630 #ifdef CONFIG_NFS_V4 631 if (clp->rpc_ops->version == 4) 632 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 633 #endif 634 if (nfss->options & NFS_OPTION_FSCACHE) 635 seq_printf(m, ",fsc"); 636 } 637 638 /* 639 * Describe the mount options on this VFS mountpoint 640 */ 641 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 642 { 643 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 644 645 nfs_show_mount_options(m, nfss, 0); 646 647 seq_printf(m, ",addr=%s", 648 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 649 RPC_DISPLAY_ADDR)); 650 651 return 0; 652 } 653 654 /* 655 * Present statistical information for this VFS mountpoint 656 */ 657 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 658 { 659 int i, cpu; 660 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 661 struct rpc_auth *auth = nfss->client->cl_auth; 662 struct nfs_iostats totals = { }; 663 664 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 665 666 /* 667 * Display all mount option settings 668 */ 669 seq_printf(m, "\n\topts:\t"); 670 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 671 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 672 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 673 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 674 nfs_show_mount_options(m, nfss, 1); 675 676 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 677 678 seq_printf(m, "\n\tcaps:\t"); 679 seq_printf(m, "caps=0x%x", nfss->caps); 680 seq_printf(m, ",wtmult=%u", nfss->wtmult); 681 seq_printf(m, ",dtsize=%u", nfss->dtsize); 682 seq_printf(m, ",bsize=%u", nfss->bsize); 683 seq_printf(m, ",namlen=%u", nfss->namelen); 684 685 #ifdef CONFIG_NFS_V4 686 if (nfss->nfs_client->rpc_ops->version == 4) { 687 seq_printf(m, "\n\tnfsv4:\t"); 688 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 689 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 690 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 691 } 692 #endif 693 694 /* 695 * Display security flavor in effect for this mount 696 */ 697 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 698 if (auth->au_flavor) 699 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 700 701 /* 702 * Display superblock I/O counters 703 */ 704 for_each_possible_cpu(cpu) { 705 struct nfs_iostats *stats; 706 707 preempt_disable(); 708 stats = per_cpu_ptr(nfss->io_stats, cpu); 709 710 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 711 totals.events[i] += stats->events[i]; 712 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 713 totals.bytes[i] += stats->bytes[i]; 714 #ifdef CONFIG_NFS_FSCACHE 715 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 716 totals.fscache[i] += stats->fscache[i]; 717 #endif 718 719 preempt_enable(); 720 } 721 722 seq_printf(m, "\n\tevents:\t"); 723 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 724 seq_printf(m, "%lu ", totals.events[i]); 725 seq_printf(m, "\n\tbytes:\t"); 726 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 727 seq_printf(m, "%Lu ", totals.bytes[i]); 728 #ifdef CONFIG_NFS_FSCACHE 729 if (nfss->options & NFS_OPTION_FSCACHE) { 730 seq_printf(m, "\n\tfsc:\t"); 731 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 732 seq_printf(m, "%Lu ", totals.bytes[i]); 733 } 734 #endif 735 seq_printf(m, "\n"); 736 737 rpc_print_iostats(m, nfss->client); 738 739 return 0; 740 } 741 742 /* 743 * Begin unmount by attempting to remove all automounted mountpoints we added 744 * in response to xdev traversals and referrals 745 */ 746 static void nfs_umount_begin(struct super_block *sb) 747 { 748 struct nfs_server *server; 749 struct rpc_clnt *rpc; 750 751 server = NFS_SB(sb); 752 /* -EIO all pending I/O */ 753 rpc = server->client_acl; 754 if (!IS_ERR(rpc)) 755 rpc_killall_tasks(rpc); 756 rpc = server->client; 757 if (!IS_ERR(rpc)) 758 rpc_killall_tasks(rpc); 759 } 760 761 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 762 { 763 struct nfs_parsed_mount_data *data; 764 765 data = kzalloc(sizeof(*data), GFP_KERNEL); 766 if (data) { 767 data->acregmin = NFS_DEF_ACREGMIN; 768 data->acregmax = NFS_DEF_ACREGMAX; 769 data->acdirmin = NFS_DEF_ACDIRMIN; 770 data->acdirmax = NFS_DEF_ACDIRMAX; 771 data->mount_server.port = NFS_UNSPEC_PORT; 772 data->nfs_server.port = NFS_UNSPEC_PORT; 773 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 774 data->auth_flavors[0] = RPC_AUTH_UNIX; 775 data->auth_flavor_len = 1; 776 data->version = version; 777 data->minorversion = 0; 778 } 779 return data; 780 } 781 782 /* 783 * Sanity-check a server address provided by the mount command. 784 * 785 * Address family must be initialized, and address must not be 786 * the ANY address for that family. 787 */ 788 static int nfs_verify_server_address(struct sockaddr *addr) 789 { 790 switch (addr->sa_family) { 791 case AF_INET: { 792 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 793 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 794 } 795 case AF_INET6: { 796 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 797 return !ipv6_addr_any(sa); 798 } 799 } 800 801 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 802 return 0; 803 } 804 805 /* 806 * Select between a default port value and a user-specified port value. 807 * If a zero value is set, then autobind will be used. 808 */ 809 static void nfs_set_port(struct sockaddr *sap, int *port, 810 const unsigned short default_port) 811 { 812 if (*port == NFS_UNSPEC_PORT) 813 *port = default_port; 814 815 rpc_set_port(sap, *port); 816 } 817 818 /* 819 * Sanity check the NFS transport protocol. 820 * 821 */ 822 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 823 { 824 switch (mnt->nfs_server.protocol) { 825 case XPRT_TRANSPORT_UDP: 826 case XPRT_TRANSPORT_TCP: 827 case XPRT_TRANSPORT_RDMA: 828 break; 829 default: 830 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 831 } 832 } 833 834 /* 835 * For text based NFSv2/v3 mounts, the mount protocol transport default 836 * settings should depend upon the specified NFS transport. 837 */ 838 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 839 { 840 nfs_validate_transport_protocol(mnt); 841 842 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 843 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 844 return; 845 switch (mnt->nfs_server.protocol) { 846 case XPRT_TRANSPORT_UDP: 847 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 848 break; 849 case XPRT_TRANSPORT_TCP: 850 case XPRT_TRANSPORT_RDMA: 851 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 852 } 853 } 854 855 /* 856 * Parse the value of the 'sec=' option. 857 */ 858 static int nfs_parse_security_flavors(char *value, 859 struct nfs_parsed_mount_data *mnt) 860 { 861 substring_t args[MAX_OPT_ARGS]; 862 863 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 864 865 switch (match_token(value, nfs_secflavor_tokens, args)) { 866 case Opt_sec_none: 867 mnt->auth_flavors[0] = RPC_AUTH_NULL; 868 break; 869 case Opt_sec_sys: 870 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 871 break; 872 case Opt_sec_krb5: 873 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 874 break; 875 case Opt_sec_krb5i: 876 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 877 break; 878 case Opt_sec_krb5p: 879 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 880 break; 881 case Opt_sec_lkey: 882 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 883 break; 884 case Opt_sec_lkeyi: 885 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 886 break; 887 case Opt_sec_lkeyp: 888 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 889 break; 890 case Opt_sec_spkm: 891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 892 break; 893 case Opt_sec_spkmi: 894 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 895 break; 896 case Opt_sec_spkmp: 897 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 898 break; 899 default: 900 return 0; 901 } 902 903 mnt->auth_flavor_len = 1; 904 return 1; 905 } 906 907 /* 908 * Error-check and convert a string of mount options from user space into 909 * a data structure. The whole mount string is processed; bad options are 910 * skipped as they are encountered. If there were no errors, return 1; 911 * otherwise return 0 (zero). 912 */ 913 static int nfs_parse_mount_options(char *raw, 914 struct nfs_parsed_mount_data *mnt) 915 { 916 char *p, *string, *secdata; 917 int rc, sloppy = 0, invalid_option = 0; 918 unsigned short protofamily = AF_UNSPEC; 919 unsigned short mountfamily = AF_UNSPEC; 920 921 if (!raw) { 922 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 923 return 1; 924 } 925 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 926 927 secdata = alloc_secdata(); 928 if (!secdata) 929 goto out_nomem; 930 931 rc = security_sb_copy_data(raw, secdata); 932 if (rc) 933 goto out_security_failure; 934 935 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 936 if (rc) 937 goto out_security_failure; 938 939 free_secdata(secdata); 940 941 while ((p = strsep(&raw, ",")) != NULL) { 942 substring_t args[MAX_OPT_ARGS]; 943 unsigned long option; 944 int token; 945 946 if (!*p) 947 continue; 948 949 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 950 951 token = match_token(p, nfs_mount_option_tokens, args); 952 switch (token) { 953 954 /* 955 * boolean options: foo/nofoo 956 */ 957 case Opt_soft: 958 mnt->flags |= NFS_MOUNT_SOFT; 959 break; 960 case Opt_hard: 961 mnt->flags &= ~NFS_MOUNT_SOFT; 962 break; 963 case Opt_posix: 964 mnt->flags |= NFS_MOUNT_POSIX; 965 break; 966 case Opt_noposix: 967 mnt->flags &= ~NFS_MOUNT_POSIX; 968 break; 969 case Opt_cto: 970 mnt->flags &= ~NFS_MOUNT_NOCTO; 971 break; 972 case Opt_nocto: 973 mnt->flags |= NFS_MOUNT_NOCTO; 974 break; 975 case Opt_ac: 976 mnt->flags &= ~NFS_MOUNT_NOAC; 977 break; 978 case Opt_noac: 979 mnt->flags |= NFS_MOUNT_NOAC; 980 break; 981 case Opt_lock: 982 mnt->flags &= ~NFS_MOUNT_NONLM; 983 break; 984 case Opt_nolock: 985 mnt->flags |= NFS_MOUNT_NONLM; 986 break; 987 case Opt_v2: 988 mnt->flags &= ~NFS_MOUNT_VER3; 989 mnt->version = 2; 990 break; 991 case Opt_v3: 992 mnt->flags |= NFS_MOUNT_VER3; 993 mnt->version = 3; 994 break; 995 #ifdef CONFIG_NFS_V4 996 case Opt_v4: 997 mnt->flags &= ~NFS_MOUNT_VER3; 998 mnt->version = 4; 999 break; 1000 #endif 1001 case Opt_udp: 1002 mnt->flags &= ~NFS_MOUNT_TCP; 1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1004 break; 1005 case Opt_tcp: 1006 mnt->flags |= NFS_MOUNT_TCP; 1007 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1008 break; 1009 case Opt_rdma: 1010 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1011 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1012 xprt_load_transport(p); 1013 break; 1014 case Opt_acl: 1015 mnt->flags &= ~NFS_MOUNT_NOACL; 1016 break; 1017 case Opt_noacl: 1018 mnt->flags |= NFS_MOUNT_NOACL; 1019 break; 1020 case Opt_rdirplus: 1021 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1022 break; 1023 case Opt_nordirplus: 1024 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1025 break; 1026 case Opt_sharecache: 1027 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1028 break; 1029 case Opt_nosharecache: 1030 mnt->flags |= NFS_MOUNT_UNSHARED; 1031 break; 1032 case Opt_resvport: 1033 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1034 break; 1035 case Opt_noresvport: 1036 mnt->flags |= NFS_MOUNT_NORESVPORT; 1037 break; 1038 case Opt_fscache: 1039 mnt->options |= NFS_OPTION_FSCACHE; 1040 kfree(mnt->fscache_uniq); 1041 mnt->fscache_uniq = NULL; 1042 break; 1043 case Opt_nofscache: 1044 mnt->options &= ~NFS_OPTION_FSCACHE; 1045 kfree(mnt->fscache_uniq); 1046 mnt->fscache_uniq = NULL; 1047 break; 1048 case Opt_fscache_uniq: 1049 string = match_strdup(args); 1050 if (!string) 1051 goto out_nomem; 1052 kfree(mnt->fscache_uniq); 1053 mnt->fscache_uniq = string; 1054 mnt->options |= NFS_OPTION_FSCACHE; 1055 break; 1056 1057 /* 1058 * options that take numeric values 1059 */ 1060 case Opt_port: 1061 string = match_strdup(args); 1062 if (string == NULL) 1063 goto out_nomem; 1064 rc = strict_strtoul(string, 10, &option); 1065 kfree(string); 1066 if (rc != 0 || option > USHORT_MAX) 1067 goto out_invalid_value; 1068 mnt->nfs_server.port = option; 1069 break; 1070 case Opt_rsize: 1071 string = match_strdup(args); 1072 if (string == NULL) 1073 goto out_nomem; 1074 rc = strict_strtoul(string, 10, &option); 1075 kfree(string); 1076 if (rc != 0) 1077 goto out_invalid_value; 1078 mnt->rsize = option; 1079 break; 1080 case Opt_wsize: 1081 string = match_strdup(args); 1082 if (string == NULL) 1083 goto out_nomem; 1084 rc = strict_strtoul(string, 10, &option); 1085 kfree(string); 1086 if (rc != 0) 1087 goto out_invalid_value; 1088 mnt->wsize = option; 1089 break; 1090 case Opt_bsize: 1091 string = match_strdup(args); 1092 if (string == NULL) 1093 goto out_nomem; 1094 rc = strict_strtoul(string, 10, &option); 1095 kfree(string); 1096 if (rc != 0) 1097 goto out_invalid_value; 1098 mnt->bsize = option; 1099 break; 1100 case Opt_timeo: 1101 string = match_strdup(args); 1102 if (string == NULL) 1103 goto out_nomem; 1104 rc = strict_strtoul(string, 10, &option); 1105 kfree(string); 1106 if (rc != 0 || option == 0) 1107 goto out_invalid_value; 1108 mnt->timeo = option; 1109 break; 1110 case Opt_retrans: 1111 string = match_strdup(args); 1112 if (string == NULL) 1113 goto out_nomem; 1114 rc = strict_strtoul(string, 10, &option); 1115 kfree(string); 1116 if (rc != 0 || option == 0) 1117 goto out_invalid_value; 1118 mnt->retrans = option; 1119 break; 1120 case Opt_acregmin: 1121 string = match_strdup(args); 1122 if (string == NULL) 1123 goto out_nomem; 1124 rc = strict_strtoul(string, 10, &option); 1125 kfree(string); 1126 if (rc != 0) 1127 goto out_invalid_value; 1128 mnt->acregmin = option; 1129 break; 1130 case Opt_acregmax: 1131 string = match_strdup(args); 1132 if (string == NULL) 1133 goto out_nomem; 1134 rc = strict_strtoul(string, 10, &option); 1135 kfree(string); 1136 if (rc != 0) 1137 goto out_invalid_value; 1138 mnt->acregmax = option; 1139 break; 1140 case Opt_acdirmin: 1141 string = match_strdup(args); 1142 if (string == NULL) 1143 goto out_nomem; 1144 rc = strict_strtoul(string, 10, &option); 1145 kfree(string); 1146 if (rc != 0) 1147 goto out_invalid_value; 1148 mnt->acdirmin = option; 1149 break; 1150 case Opt_acdirmax: 1151 string = match_strdup(args); 1152 if (string == NULL) 1153 goto out_nomem; 1154 rc = strict_strtoul(string, 10, &option); 1155 kfree(string); 1156 if (rc != 0) 1157 goto out_invalid_value; 1158 mnt->acdirmax = option; 1159 break; 1160 case Opt_actimeo: 1161 string = match_strdup(args); 1162 if (string == NULL) 1163 goto out_nomem; 1164 rc = strict_strtoul(string, 10, &option); 1165 kfree(string); 1166 if (rc != 0) 1167 goto out_invalid_value; 1168 mnt->acregmin = mnt->acregmax = 1169 mnt->acdirmin = mnt->acdirmax = option; 1170 break; 1171 case Opt_namelen: 1172 string = match_strdup(args); 1173 if (string == NULL) 1174 goto out_nomem; 1175 rc = strict_strtoul(string, 10, &option); 1176 kfree(string); 1177 if (rc != 0) 1178 goto out_invalid_value; 1179 mnt->namlen = option; 1180 break; 1181 case Opt_mountport: 1182 string = match_strdup(args); 1183 if (string == NULL) 1184 goto out_nomem; 1185 rc = strict_strtoul(string, 10, &option); 1186 kfree(string); 1187 if (rc != 0 || option > USHORT_MAX) 1188 goto out_invalid_value; 1189 mnt->mount_server.port = option; 1190 break; 1191 case Opt_mountvers: 1192 string = match_strdup(args); 1193 if (string == NULL) 1194 goto out_nomem; 1195 rc = strict_strtoul(string, 10, &option); 1196 kfree(string); 1197 if (rc != 0 || 1198 option < NFS_MNT_VERSION || 1199 option > NFS_MNT3_VERSION) 1200 goto out_invalid_value; 1201 mnt->mount_server.version = option; 1202 break; 1203 case Opt_nfsvers: 1204 string = match_strdup(args); 1205 if (string == NULL) 1206 goto out_nomem; 1207 rc = strict_strtoul(string, 10, &option); 1208 kfree(string); 1209 if (rc != 0) 1210 goto out_invalid_value; 1211 switch (option) { 1212 case NFS2_VERSION: 1213 mnt->flags &= ~NFS_MOUNT_VER3; 1214 mnt->version = 2; 1215 break; 1216 case NFS3_VERSION: 1217 mnt->flags |= NFS_MOUNT_VER3; 1218 mnt->version = 3; 1219 break; 1220 #ifdef CONFIG_NFS_V4 1221 case NFS4_VERSION: 1222 mnt->flags &= ~NFS_MOUNT_VER3; 1223 mnt->version = 4; 1224 break; 1225 #endif 1226 default: 1227 goto out_invalid_value; 1228 } 1229 break; 1230 case Opt_minorversion: 1231 string = match_strdup(args); 1232 if (string == NULL) 1233 goto out_nomem; 1234 rc = strict_strtoul(string, 10, &option); 1235 kfree(string); 1236 if (rc != 0) 1237 goto out_invalid_value; 1238 if (option > NFS4_MAX_MINOR_VERSION) 1239 goto out_invalid_value; 1240 mnt->minorversion = option; 1241 break; 1242 1243 /* 1244 * options that take text values 1245 */ 1246 case Opt_sec: 1247 string = match_strdup(args); 1248 if (string == NULL) 1249 goto out_nomem; 1250 rc = nfs_parse_security_flavors(string, mnt); 1251 kfree(string); 1252 if (!rc) { 1253 dfprintk(MOUNT, "NFS: unrecognized " 1254 "security flavor\n"); 1255 return 0; 1256 } 1257 break; 1258 case Opt_proto: 1259 string = match_strdup(args); 1260 if (string == NULL) 1261 goto out_nomem; 1262 token = match_token(string, 1263 nfs_xprt_protocol_tokens, args); 1264 1265 protofamily = AF_INET; 1266 switch (token) { 1267 case Opt_xprt_udp6: 1268 protofamily = AF_INET6; 1269 case Opt_xprt_udp: 1270 mnt->flags &= ~NFS_MOUNT_TCP; 1271 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1272 kfree(string); 1273 break; 1274 case Opt_xprt_tcp6: 1275 protofamily = AF_INET6; 1276 case Opt_xprt_tcp: 1277 mnt->flags |= NFS_MOUNT_TCP; 1278 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1279 kfree(string); 1280 break; 1281 case Opt_xprt_rdma: 1282 /* vector side protocols to TCP */ 1283 mnt->flags |= NFS_MOUNT_TCP; 1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1285 xprt_load_transport(string); 1286 kfree(string); 1287 break; 1288 default: 1289 dfprintk(MOUNT, "NFS: unrecognized " 1290 "transport protocol\n"); 1291 kfree(string); 1292 return 0; 1293 } 1294 break; 1295 case Opt_mountproto: 1296 string = match_strdup(args); 1297 if (string == NULL) 1298 goto out_nomem; 1299 token = match_token(string, 1300 nfs_xprt_protocol_tokens, args); 1301 kfree(string); 1302 1303 mountfamily = AF_INET; 1304 switch (token) { 1305 case Opt_xprt_udp6: 1306 mountfamily = AF_INET6; 1307 case Opt_xprt_udp: 1308 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1309 break; 1310 case Opt_xprt_tcp6: 1311 mountfamily = AF_INET6; 1312 case Opt_xprt_tcp: 1313 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1314 break; 1315 case Opt_xprt_rdma: /* not used for side protocols */ 1316 default: 1317 dfprintk(MOUNT, "NFS: unrecognized " 1318 "transport protocol\n"); 1319 return 0; 1320 } 1321 break; 1322 case Opt_addr: 1323 string = match_strdup(args); 1324 if (string == NULL) 1325 goto out_nomem; 1326 mnt->nfs_server.addrlen = 1327 rpc_pton(string, strlen(string), 1328 (struct sockaddr *) 1329 &mnt->nfs_server.address, 1330 sizeof(mnt->nfs_server.address)); 1331 kfree(string); 1332 if (mnt->nfs_server.addrlen == 0) 1333 goto out_invalid_address; 1334 break; 1335 case Opt_clientaddr: 1336 string = match_strdup(args); 1337 if (string == NULL) 1338 goto out_nomem; 1339 kfree(mnt->client_address); 1340 mnt->client_address = string; 1341 break; 1342 case Opt_mounthost: 1343 string = match_strdup(args); 1344 if (string == NULL) 1345 goto out_nomem; 1346 kfree(mnt->mount_server.hostname); 1347 mnt->mount_server.hostname = string; 1348 break; 1349 case Opt_mountaddr: 1350 string = match_strdup(args); 1351 if (string == NULL) 1352 goto out_nomem; 1353 mnt->mount_server.addrlen = 1354 rpc_pton(string, strlen(string), 1355 (struct sockaddr *) 1356 &mnt->mount_server.address, 1357 sizeof(mnt->mount_server.address)); 1358 kfree(string); 1359 if (mnt->mount_server.addrlen == 0) 1360 goto out_invalid_address; 1361 break; 1362 case Opt_lookupcache: 1363 string = match_strdup(args); 1364 if (string == NULL) 1365 goto out_nomem; 1366 token = match_token(string, 1367 nfs_lookupcache_tokens, args); 1368 kfree(string); 1369 switch (token) { 1370 case Opt_lookupcache_all: 1371 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1372 break; 1373 case Opt_lookupcache_positive: 1374 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1375 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1376 break; 1377 case Opt_lookupcache_none: 1378 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1379 break; 1380 default: 1381 dfprintk(MOUNT, "NFS: invalid " 1382 "lookupcache argument\n"); 1383 return 0; 1384 }; 1385 break; 1386 1387 /* 1388 * Special options 1389 */ 1390 case Opt_sloppy: 1391 sloppy = 1; 1392 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1393 break; 1394 case Opt_userspace: 1395 case Opt_deprecated: 1396 dfprintk(MOUNT, "NFS: ignoring mount option " 1397 "'%s'\n", p); 1398 break; 1399 1400 default: 1401 invalid_option = 1; 1402 dfprintk(MOUNT, "NFS: unrecognized mount option " 1403 "'%s'\n", p); 1404 } 1405 } 1406 1407 if (!sloppy && invalid_option) 1408 return 0; 1409 1410 /* 1411 * verify that any proto=/mountproto= options match the address 1412 * familiies in the addr=/mountaddr= options. 1413 */ 1414 if (protofamily != AF_UNSPEC && 1415 protofamily != mnt->nfs_server.address.ss_family) 1416 goto out_proto_mismatch; 1417 1418 if (mountfamily != AF_UNSPEC) { 1419 if (mnt->mount_server.addrlen) { 1420 if (mountfamily != mnt->mount_server.address.ss_family) 1421 goto out_mountproto_mismatch; 1422 } else { 1423 if (mountfamily != mnt->nfs_server.address.ss_family) 1424 goto out_mountproto_mismatch; 1425 } 1426 } 1427 1428 return 1; 1429 1430 out_mountproto_mismatch: 1431 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1432 "option\n"); 1433 return 0; 1434 out_proto_mismatch: 1435 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1436 return 0; 1437 out_invalid_address: 1438 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1439 return 0; 1440 out_invalid_value: 1441 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1442 return 0; 1443 out_nomem: 1444 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1445 return 0; 1446 out_security_failure: 1447 free_secdata(secdata); 1448 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1449 return 0; 1450 } 1451 1452 /* 1453 * Match the requested auth flavors with the list returned by 1454 * the server. Returns zero and sets the mount's authentication 1455 * flavor on success; returns -EACCES if server does not support 1456 * the requested flavor. 1457 */ 1458 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1459 struct nfs_mount_request *request) 1460 { 1461 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1462 1463 /* 1464 * Certain releases of Linux's mountd return an empty 1465 * flavor list. To prevent behavioral regression with 1466 * these servers (ie. rejecting mounts that used to 1467 * succeed), revert to pre-2.6.32 behavior (no checking) 1468 * if the returned flavor list is empty. 1469 */ 1470 if (server_authlist_len == 0) 1471 return 0; 1472 1473 /* 1474 * We avoid sophisticated negotiating here, as there are 1475 * plenty of cases where we can get it wrong, providing 1476 * either too little or too much security. 1477 * 1478 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1479 * flavor listed first. However, some servers list 1480 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1481 * preferred default, in args->auth_flavors[0] if user 1482 * didn't specify sec= mount option. 1483 */ 1484 for (i = 0; i < args->auth_flavor_len; i++) 1485 for (j = 0; j < server_authlist_len; j++) 1486 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1487 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1488 request->auth_flavs[j]); 1489 args->auth_flavors[0] = request->auth_flavs[j]; 1490 return 0; 1491 } 1492 1493 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1494 nfs_umount(request); 1495 return -EACCES; 1496 } 1497 1498 /* 1499 * Use the remote server's MOUNT service to request the NFS file handle 1500 * corresponding to the provided path. 1501 */ 1502 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1503 struct nfs_fh *root_fh) 1504 { 1505 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1506 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1507 struct nfs_mount_request request = { 1508 .sap = (struct sockaddr *) 1509 &args->mount_server.address, 1510 .dirpath = args->nfs_server.export_path, 1511 .protocol = args->mount_server.protocol, 1512 .fh = root_fh, 1513 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1514 .auth_flav_len = &server_authlist_len, 1515 .auth_flavs = server_authlist, 1516 }; 1517 int status; 1518 1519 if (args->mount_server.version == 0) { 1520 switch (args->version) { 1521 default: 1522 args->mount_server.version = NFS_MNT3_VERSION; 1523 break; 1524 case 2: 1525 args->mount_server.version = NFS_MNT_VERSION; 1526 } 1527 } 1528 request.version = args->mount_server.version; 1529 1530 if (args->mount_server.hostname) 1531 request.hostname = args->mount_server.hostname; 1532 else 1533 request.hostname = args->nfs_server.hostname; 1534 1535 /* 1536 * Construct the mount server's address. 1537 */ 1538 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1539 memcpy(request.sap, &args->nfs_server.address, 1540 args->nfs_server.addrlen); 1541 args->mount_server.addrlen = args->nfs_server.addrlen; 1542 } 1543 request.salen = args->mount_server.addrlen; 1544 nfs_set_port(request.sap, &args->mount_server.port, 0); 1545 1546 /* 1547 * Now ask the mount server to map our export path 1548 * to a file handle. 1549 */ 1550 status = nfs_mount(&request); 1551 if (status != 0) { 1552 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1553 request.hostname, status); 1554 return status; 1555 } 1556 1557 /* 1558 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1559 */ 1560 if (args->mount_server.version != NFS_MNT3_VERSION) 1561 return 0; 1562 return nfs_walk_authlist(args, &request); 1563 } 1564 1565 static int nfs_parse_simple_hostname(const char *dev_name, 1566 char **hostname, size_t maxnamlen, 1567 char **export_path, size_t maxpathlen) 1568 { 1569 size_t len; 1570 char *colon, *comma; 1571 1572 colon = strchr(dev_name, ':'); 1573 if (colon == NULL) 1574 goto out_bad_devname; 1575 1576 len = colon - dev_name; 1577 if (len > maxnamlen) 1578 goto out_hostname; 1579 1580 /* N.B. caller will free nfs_server.hostname in all cases */ 1581 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1582 if (!*hostname) 1583 goto out_nomem; 1584 1585 /* kill possible hostname list: not supported */ 1586 comma = strchr(*hostname, ','); 1587 if (comma != NULL) { 1588 if (comma == *hostname) 1589 goto out_bad_devname; 1590 *comma = '\0'; 1591 } 1592 1593 colon++; 1594 len = strlen(colon); 1595 if (len > maxpathlen) 1596 goto out_path; 1597 *export_path = kstrndup(colon, len, GFP_KERNEL); 1598 if (!*export_path) 1599 goto out_nomem; 1600 1601 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1602 return 0; 1603 1604 out_bad_devname: 1605 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1606 return -EINVAL; 1607 1608 out_nomem: 1609 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1610 return -ENOMEM; 1611 1612 out_hostname: 1613 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1614 return -ENAMETOOLONG; 1615 1616 out_path: 1617 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1618 return -ENAMETOOLONG; 1619 } 1620 1621 /* 1622 * Hostname has square brackets around it because it contains one or 1623 * more colons. We look for the first closing square bracket, and a 1624 * colon must follow it. 1625 */ 1626 static int nfs_parse_protected_hostname(const char *dev_name, 1627 char **hostname, size_t maxnamlen, 1628 char **export_path, size_t maxpathlen) 1629 { 1630 size_t len; 1631 char *start, *end; 1632 1633 start = (char *)(dev_name + 1); 1634 1635 end = strchr(start, ']'); 1636 if (end == NULL) 1637 goto out_bad_devname; 1638 if (*(end + 1) != ':') 1639 goto out_bad_devname; 1640 1641 len = end - start; 1642 if (len > maxnamlen) 1643 goto out_hostname; 1644 1645 /* N.B. caller will free nfs_server.hostname in all cases */ 1646 *hostname = kstrndup(start, len, GFP_KERNEL); 1647 if (*hostname == NULL) 1648 goto out_nomem; 1649 1650 end += 2; 1651 len = strlen(end); 1652 if (len > maxpathlen) 1653 goto out_path; 1654 *export_path = kstrndup(end, len, GFP_KERNEL); 1655 if (!*export_path) 1656 goto out_nomem; 1657 1658 return 0; 1659 1660 out_bad_devname: 1661 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1662 return -EINVAL; 1663 1664 out_nomem: 1665 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1666 return -ENOMEM; 1667 1668 out_hostname: 1669 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1670 return -ENAMETOOLONG; 1671 1672 out_path: 1673 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1674 return -ENAMETOOLONG; 1675 } 1676 1677 /* 1678 * Split "dev_name" into "hostname:export_path". 1679 * 1680 * The leftmost colon demarks the split between the server's hostname 1681 * and the export path. If the hostname starts with a left square 1682 * bracket, then it may contain colons. 1683 * 1684 * Note: caller frees hostname and export path, even on error. 1685 */ 1686 static int nfs_parse_devname(const char *dev_name, 1687 char **hostname, size_t maxnamlen, 1688 char **export_path, size_t maxpathlen) 1689 { 1690 if (*dev_name == '[') 1691 return nfs_parse_protected_hostname(dev_name, 1692 hostname, maxnamlen, 1693 export_path, maxpathlen); 1694 1695 return nfs_parse_simple_hostname(dev_name, 1696 hostname, maxnamlen, 1697 export_path, maxpathlen); 1698 } 1699 1700 /* 1701 * Validate the NFS2/NFS3 mount data 1702 * - fills in the mount root filehandle 1703 * 1704 * For option strings, user space handles the following behaviors: 1705 * 1706 * + DNS: mapping server host name to IP address ("addr=" option) 1707 * 1708 * + failure mode: how to behave if a mount request can't be handled 1709 * immediately ("fg/bg" option) 1710 * 1711 * + retry: how often to retry a mount request ("retry=" option) 1712 * 1713 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1714 * mountproto=tcp after mountproto=udp, and so on 1715 */ 1716 static int nfs_validate_mount_data(void *options, 1717 struct nfs_parsed_mount_data *args, 1718 struct nfs_fh *mntfh, 1719 const char *dev_name) 1720 { 1721 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1722 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1723 1724 if (data == NULL) 1725 goto out_no_data; 1726 1727 switch (data->version) { 1728 case 1: 1729 data->namlen = 0; 1730 case 2: 1731 data->bsize = 0; 1732 case 3: 1733 if (data->flags & NFS_MOUNT_VER3) 1734 goto out_no_v3; 1735 data->root.size = NFS2_FHSIZE; 1736 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1737 case 4: 1738 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1739 goto out_no_sec; 1740 case 5: 1741 memset(data->context, 0, sizeof(data->context)); 1742 case 6: 1743 if (data->flags & NFS_MOUNT_VER3) { 1744 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1745 goto out_invalid_fh; 1746 mntfh->size = data->root.size; 1747 args->version = 3; 1748 } else { 1749 mntfh->size = NFS2_FHSIZE; 1750 args->version = 2; 1751 } 1752 1753 1754 memcpy(mntfh->data, data->root.data, mntfh->size); 1755 if (mntfh->size < sizeof(mntfh->data)) 1756 memset(mntfh->data + mntfh->size, 0, 1757 sizeof(mntfh->data) - mntfh->size); 1758 1759 /* 1760 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1761 * can deal with. 1762 */ 1763 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1764 args->rsize = data->rsize; 1765 args->wsize = data->wsize; 1766 args->timeo = data->timeo; 1767 args->retrans = data->retrans; 1768 args->acregmin = data->acregmin; 1769 args->acregmax = data->acregmax; 1770 args->acdirmin = data->acdirmin; 1771 args->acdirmax = data->acdirmax; 1772 1773 memcpy(sap, &data->addr, sizeof(data->addr)); 1774 args->nfs_server.addrlen = sizeof(data->addr); 1775 if (!nfs_verify_server_address(sap)) 1776 goto out_no_address; 1777 1778 if (!(data->flags & NFS_MOUNT_TCP)) 1779 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1780 /* N.B. caller will free nfs_server.hostname in all cases */ 1781 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1782 args->namlen = data->namlen; 1783 args->bsize = data->bsize; 1784 1785 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1786 args->auth_flavors[0] = data->pseudoflavor; 1787 if (!args->nfs_server.hostname) 1788 goto out_nomem; 1789 1790 /* 1791 * The legacy version 6 binary mount data from userspace has a 1792 * field used only to transport selinux information into the 1793 * the kernel. To continue to support that functionality we 1794 * have a touch of selinux knowledge here in the NFS code. The 1795 * userspace code converted context=blah to just blah so we are 1796 * converting back to the full string selinux understands. 1797 */ 1798 if (data->context[0]){ 1799 #ifdef CONFIG_SECURITY_SELINUX 1800 int rc; 1801 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1802 if (!opts_str) 1803 return -ENOMEM; 1804 strcpy(opts_str, "context="); 1805 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1806 strcat(opts_str, &data->context[0]); 1807 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1808 kfree(opts_str); 1809 if (rc) 1810 return rc; 1811 #else 1812 return -EINVAL; 1813 #endif 1814 } 1815 1816 break; 1817 default: { 1818 int status; 1819 1820 if (nfs_parse_mount_options((char *)options, args) == 0) 1821 return -EINVAL; 1822 1823 if (!nfs_verify_server_address(sap)) 1824 goto out_no_address; 1825 1826 if (args->version == 4) 1827 #ifdef CONFIG_NFS_V4 1828 return nfs4_validate_text_mount_data(options, 1829 args, dev_name); 1830 #else 1831 goto out_v4_not_compiled; 1832 #endif 1833 1834 nfs_set_port(sap, &args->nfs_server.port, 0); 1835 1836 nfs_set_mount_transport_protocol(args); 1837 1838 status = nfs_parse_devname(dev_name, 1839 &args->nfs_server.hostname, 1840 PAGE_SIZE, 1841 &args->nfs_server.export_path, 1842 NFS_MAXPATHLEN); 1843 if (!status) 1844 status = nfs_try_mount(args, mntfh); 1845 1846 kfree(args->nfs_server.export_path); 1847 args->nfs_server.export_path = NULL; 1848 1849 if (status) 1850 return status; 1851 1852 break; 1853 } 1854 } 1855 1856 #ifndef CONFIG_NFS_V3 1857 if (args->version == 3) 1858 goto out_v3_not_compiled; 1859 #endif /* !CONFIG_NFS_V3 */ 1860 1861 return 0; 1862 1863 out_no_data: 1864 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1865 return -EINVAL; 1866 1867 out_no_v3: 1868 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1869 data->version); 1870 return -EINVAL; 1871 1872 out_no_sec: 1873 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1874 return -EINVAL; 1875 1876 #ifndef CONFIG_NFS_V3 1877 out_v3_not_compiled: 1878 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1879 return -EPROTONOSUPPORT; 1880 #endif /* !CONFIG_NFS_V3 */ 1881 1882 #ifndef CONFIG_NFS_V4 1883 out_v4_not_compiled: 1884 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1885 return -EPROTONOSUPPORT; 1886 #endif /* !CONFIG_NFS_V4 */ 1887 1888 out_nomem: 1889 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1890 return -ENOMEM; 1891 1892 out_no_address: 1893 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1894 return -EINVAL; 1895 1896 out_invalid_fh: 1897 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1898 return -EINVAL; 1899 } 1900 1901 static int 1902 nfs_compare_remount_data(struct nfs_server *nfss, 1903 struct nfs_parsed_mount_data *data) 1904 { 1905 if (data->flags != nfss->flags || 1906 data->rsize != nfss->rsize || 1907 data->wsize != nfss->wsize || 1908 data->retrans != nfss->client->cl_timeout->to_retries || 1909 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1910 data->acregmin != nfss->acregmin / HZ || 1911 data->acregmax != nfss->acregmax / HZ || 1912 data->acdirmin != nfss->acdirmin / HZ || 1913 data->acdirmax != nfss->acdirmax / HZ || 1914 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1915 data->nfs_server.port != nfss->port || 1916 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1917 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1918 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1919 return -EINVAL; 1920 1921 return 0; 1922 } 1923 1924 static int 1925 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1926 { 1927 int error; 1928 struct nfs_server *nfss = sb->s_fs_info; 1929 struct nfs_parsed_mount_data *data; 1930 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1931 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1932 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1933 1934 /* 1935 * Userspace mount programs that send binary options generally send 1936 * them populated with default values. We have no way to know which 1937 * ones were explicitly specified. Fall back to legacy behavior and 1938 * just return success. 1939 */ 1940 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1941 (nfsvers <= 3 && (!options || (options->version >= 1 && 1942 options->version <= 6)))) 1943 return 0; 1944 1945 data = kzalloc(sizeof(*data), GFP_KERNEL); 1946 if (data == NULL) 1947 return -ENOMEM; 1948 1949 /* fill out struct with values from existing mount */ 1950 data->flags = nfss->flags; 1951 data->rsize = nfss->rsize; 1952 data->wsize = nfss->wsize; 1953 data->retrans = nfss->client->cl_timeout->to_retries; 1954 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1955 data->acregmin = nfss->acregmin / HZ; 1956 data->acregmax = nfss->acregmax / HZ; 1957 data->acdirmin = nfss->acdirmin / HZ; 1958 data->acdirmax = nfss->acdirmax / HZ; 1959 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1960 data->nfs_server.port = nfss->port; 1961 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1962 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1963 data->nfs_server.addrlen); 1964 1965 /* overwrite those values with any that were specified */ 1966 error = nfs_parse_mount_options((char *)options, data); 1967 if (error < 0) 1968 goto out; 1969 1970 /* compare new mount options with old ones */ 1971 error = nfs_compare_remount_data(nfss, data); 1972 out: 1973 kfree(data); 1974 return error; 1975 } 1976 1977 /* 1978 * Initialise the common bits of the superblock 1979 */ 1980 static inline void nfs_initialise_sb(struct super_block *sb) 1981 { 1982 struct nfs_server *server = NFS_SB(sb); 1983 1984 sb->s_magic = NFS_SUPER_MAGIC; 1985 1986 /* We probably want something more informative here */ 1987 snprintf(sb->s_id, sizeof(sb->s_id), 1988 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1989 1990 if (sb->s_blocksize == 0) 1991 sb->s_blocksize = nfs_block_bits(server->wsize, 1992 &sb->s_blocksize_bits); 1993 1994 if (server->flags & NFS_MOUNT_NOAC) 1995 sb->s_flags |= MS_SYNCHRONOUS; 1996 1997 sb->s_bdi = &server->backing_dev_info; 1998 1999 nfs_super_set_maxbytes(sb, server->maxfilesize); 2000 } 2001 2002 /* 2003 * Finish setting up an NFS2/3 superblock 2004 */ 2005 static void nfs_fill_super(struct super_block *sb, 2006 struct nfs_parsed_mount_data *data) 2007 { 2008 struct nfs_server *server = NFS_SB(sb); 2009 2010 sb->s_blocksize_bits = 0; 2011 sb->s_blocksize = 0; 2012 if (data->bsize) 2013 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2014 2015 if (server->nfs_client->rpc_ops->version == 3) { 2016 /* The VFS shouldn't apply the umask to mode bits. We will do 2017 * so ourselves when necessary. 2018 */ 2019 sb->s_flags |= MS_POSIXACL; 2020 sb->s_time_gran = 1; 2021 } 2022 2023 sb->s_op = &nfs_sops; 2024 nfs_initialise_sb(sb); 2025 } 2026 2027 /* 2028 * Finish setting up a cloned NFS2/3 superblock 2029 */ 2030 static void nfs_clone_super(struct super_block *sb, 2031 const struct super_block *old_sb) 2032 { 2033 struct nfs_server *server = NFS_SB(sb); 2034 2035 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2036 sb->s_blocksize = old_sb->s_blocksize; 2037 sb->s_maxbytes = old_sb->s_maxbytes; 2038 2039 if (server->nfs_client->rpc_ops->version == 3) { 2040 /* The VFS shouldn't apply the umask to mode bits. We will do 2041 * so ourselves when necessary. 2042 */ 2043 sb->s_flags |= MS_POSIXACL; 2044 sb->s_time_gran = 1; 2045 } 2046 2047 sb->s_op = old_sb->s_op; 2048 nfs_initialise_sb(sb); 2049 } 2050 2051 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2052 { 2053 const struct nfs_server *a = s->s_fs_info; 2054 const struct rpc_clnt *clnt_a = a->client; 2055 const struct rpc_clnt *clnt_b = b->client; 2056 2057 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2058 goto Ebusy; 2059 if (a->nfs_client != b->nfs_client) 2060 goto Ebusy; 2061 if (a->flags != b->flags) 2062 goto Ebusy; 2063 if (a->wsize != b->wsize) 2064 goto Ebusy; 2065 if (a->rsize != b->rsize) 2066 goto Ebusy; 2067 if (a->acregmin != b->acregmin) 2068 goto Ebusy; 2069 if (a->acregmax != b->acregmax) 2070 goto Ebusy; 2071 if (a->acdirmin != b->acdirmin) 2072 goto Ebusy; 2073 if (a->acdirmax != b->acdirmax) 2074 goto Ebusy; 2075 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2076 goto Ebusy; 2077 return 1; 2078 Ebusy: 2079 return 0; 2080 } 2081 2082 struct nfs_sb_mountdata { 2083 struct nfs_server *server; 2084 int mntflags; 2085 }; 2086 2087 static int nfs_set_super(struct super_block *s, void *data) 2088 { 2089 struct nfs_sb_mountdata *sb_mntdata = data; 2090 struct nfs_server *server = sb_mntdata->server; 2091 int ret; 2092 2093 s->s_flags = sb_mntdata->mntflags; 2094 s->s_fs_info = server; 2095 ret = set_anon_super(s, server); 2096 if (ret == 0) 2097 server->s_dev = s->s_dev; 2098 return ret; 2099 } 2100 2101 static int nfs_compare_super_address(struct nfs_server *server1, 2102 struct nfs_server *server2) 2103 { 2104 struct sockaddr *sap1, *sap2; 2105 2106 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2107 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2108 2109 if (sap1->sa_family != sap2->sa_family) 2110 return 0; 2111 2112 switch (sap1->sa_family) { 2113 case AF_INET: { 2114 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2115 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2116 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2117 return 0; 2118 if (sin1->sin_port != sin2->sin_port) 2119 return 0; 2120 break; 2121 } 2122 case AF_INET6: { 2123 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2124 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2125 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2126 return 0; 2127 if (sin1->sin6_port != sin2->sin6_port) 2128 return 0; 2129 break; 2130 } 2131 default: 2132 return 0; 2133 } 2134 2135 return 1; 2136 } 2137 2138 static int nfs_compare_super(struct super_block *sb, void *data) 2139 { 2140 struct nfs_sb_mountdata *sb_mntdata = data; 2141 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2142 int mntflags = sb_mntdata->mntflags; 2143 2144 if (!nfs_compare_super_address(old, server)) 2145 return 0; 2146 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2147 if (old->flags & NFS_MOUNT_UNSHARED) 2148 return 0; 2149 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2150 return 0; 2151 return nfs_compare_mount_options(sb, server, mntflags); 2152 } 2153 2154 static int nfs_bdi_register(struct nfs_server *server) 2155 { 2156 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2157 } 2158 2159 static int nfs_get_sb(struct file_system_type *fs_type, 2160 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2161 { 2162 struct nfs_server *server = NULL; 2163 struct super_block *s; 2164 struct nfs_parsed_mount_data *data; 2165 struct nfs_fh *mntfh; 2166 struct dentry *mntroot; 2167 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2168 struct nfs_sb_mountdata sb_mntdata = { 2169 .mntflags = flags, 2170 }; 2171 int error = -ENOMEM; 2172 2173 data = nfs_alloc_parsed_mount_data(3); 2174 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2175 if (data == NULL || mntfh == NULL) 2176 goto out_free_fh; 2177 2178 security_init_mnt_opts(&data->lsm_opts); 2179 2180 /* Validate the mount data */ 2181 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2182 if (error < 0) 2183 goto out; 2184 2185 #ifdef CONFIG_NFS_V4 2186 if (data->version == 4) { 2187 error = nfs4_try_mount(flags, dev_name, data, mnt); 2188 kfree(data->client_address); 2189 goto out; 2190 } 2191 #endif /* CONFIG_NFS_V4 */ 2192 2193 /* Get a volume representation */ 2194 server = nfs_create_server(data, mntfh); 2195 if (IS_ERR(server)) { 2196 error = PTR_ERR(server); 2197 goto out; 2198 } 2199 sb_mntdata.server = server; 2200 2201 if (server->flags & NFS_MOUNT_UNSHARED) 2202 compare_super = NULL; 2203 2204 /* Get a superblock - note that we may end up sharing one that already exists */ 2205 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2206 if (IS_ERR(s)) { 2207 error = PTR_ERR(s); 2208 goto out_err_nosb; 2209 } 2210 2211 if (s->s_fs_info != server) { 2212 nfs_free_server(server); 2213 server = NULL; 2214 } else { 2215 error = nfs_bdi_register(server); 2216 if (error) 2217 goto error_splat_super; 2218 } 2219 2220 if (!s->s_root) { 2221 /* initial superblock/root creation */ 2222 nfs_fill_super(s, data); 2223 nfs_fscache_get_super_cookie( 2224 s, data ? data->fscache_uniq : NULL, NULL); 2225 } 2226 2227 mntroot = nfs_get_root(s, mntfh); 2228 if (IS_ERR(mntroot)) { 2229 error = PTR_ERR(mntroot); 2230 goto error_splat_super; 2231 } 2232 2233 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2234 if (error) 2235 goto error_splat_root; 2236 2237 s->s_flags |= MS_ACTIVE; 2238 mnt->mnt_sb = s; 2239 mnt->mnt_root = mntroot; 2240 error = 0; 2241 2242 out: 2243 kfree(data->nfs_server.hostname); 2244 kfree(data->mount_server.hostname); 2245 kfree(data->fscache_uniq); 2246 security_free_mnt_opts(&data->lsm_opts); 2247 out_free_fh: 2248 kfree(mntfh); 2249 kfree(data); 2250 return error; 2251 2252 out_err_nosb: 2253 nfs_free_server(server); 2254 goto out; 2255 2256 error_splat_root: 2257 dput(mntroot); 2258 error_splat_super: 2259 deactivate_locked_super(s); 2260 goto out; 2261 } 2262 2263 /* 2264 * Ensure that we unregister the bdi before kill_anon_super 2265 * releases the device name 2266 */ 2267 static void nfs_put_super(struct super_block *s) 2268 { 2269 struct nfs_server *server = NFS_SB(s); 2270 2271 bdi_unregister(&server->backing_dev_info); 2272 } 2273 2274 /* 2275 * Destroy an NFS2/3 superblock 2276 */ 2277 static void nfs_kill_super(struct super_block *s) 2278 { 2279 struct nfs_server *server = NFS_SB(s); 2280 2281 kill_anon_super(s); 2282 nfs_fscache_release_super_cookie(s); 2283 nfs_free_server(server); 2284 } 2285 2286 /* 2287 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2288 */ 2289 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 2290 const char *dev_name, void *raw_data, 2291 struct vfsmount *mnt) 2292 { 2293 struct nfs_clone_mount *data = raw_data; 2294 struct super_block *s; 2295 struct nfs_server *server; 2296 struct dentry *mntroot; 2297 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2298 struct nfs_sb_mountdata sb_mntdata = { 2299 .mntflags = flags, 2300 }; 2301 int error; 2302 2303 dprintk("--> nfs_xdev_get_sb()\n"); 2304 2305 /* create a new volume representation */ 2306 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2307 if (IS_ERR(server)) { 2308 error = PTR_ERR(server); 2309 goto out_err_noserver; 2310 } 2311 sb_mntdata.server = server; 2312 2313 if (server->flags & NFS_MOUNT_UNSHARED) 2314 compare_super = NULL; 2315 2316 /* Get a superblock - note that we may end up sharing one that already exists */ 2317 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2318 if (IS_ERR(s)) { 2319 error = PTR_ERR(s); 2320 goto out_err_nosb; 2321 } 2322 2323 if (s->s_fs_info != server) { 2324 nfs_free_server(server); 2325 server = NULL; 2326 } else { 2327 error = nfs_bdi_register(server); 2328 if (error) 2329 goto error_splat_super; 2330 } 2331 2332 if (!s->s_root) { 2333 /* initial superblock/root creation */ 2334 nfs_clone_super(s, data->sb); 2335 nfs_fscache_get_super_cookie(s, NULL, data); 2336 } 2337 2338 mntroot = nfs_get_root(s, data->fh); 2339 if (IS_ERR(mntroot)) { 2340 error = PTR_ERR(mntroot); 2341 goto error_splat_super; 2342 } 2343 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2344 dput(mntroot); 2345 error = -ESTALE; 2346 goto error_splat_super; 2347 } 2348 2349 s->s_flags |= MS_ACTIVE; 2350 mnt->mnt_sb = s; 2351 mnt->mnt_root = mntroot; 2352 2353 /* clone any lsm security options from the parent to the new sb */ 2354 security_sb_clone_mnt_opts(data->sb, s); 2355 2356 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 2357 return 0; 2358 2359 out_err_nosb: 2360 nfs_free_server(server); 2361 out_err_noserver: 2362 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 2363 return error; 2364 2365 error_splat_super: 2366 deactivate_locked_super(s); 2367 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 2368 return error; 2369 } 2370 2371 #ifdef CONFIG_NFS_V4 2372 2373 /* 2374 * Finish setting up a cloned NFS4 superblock 2375 */ 2376 static void nfs4_clone_super(struct super_block *sb, 2377 const struct super_block *old_sb) 2378 { 2379 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2380 sb->s_blocksize = old_sb->s_blocksize; 2381 sb->s_maxbytes = old_sb->s_maxbytes; 2382 sb->s_time_gran = 1; 2383 sb->s_op = old_sb->s_op; 2384 nfs_initialise_sb(sb); 2385 } 2386 2387 /* 2388 * Set up an NFS4 superblock 2389 */ 2390 static void nfs4_fill_super(struct super_block *sb) 2391 { 2392 sb->s_time_gran = 1; 2393 sb->s_op = &nfs4_sops; 2394 nfs_initialise_sb(sb); 2395 } 2396 2397 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2398 { 2399 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3); 2400 } 2401 2402 static int nfs4_validate_text_mount_data(void *options, 2403 struct nfs_parsed_mount_data *args, 2404 const char *dev_name) 2405 { 2406 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2407 2408 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2409 2410 nfs_validate_transport_protocol(args); 2411 2412 nfs4_validate_mount_flags(args); 2413 2414 if (args->version != 4) { 2415 dfprintk(MOUNT, 2416 "NFS4: Illegal mount version\n"); 2417 return -EINVAL; 2418 } 2419 2420 if (args->auth_flavor_len > 1) { 2421 dfprintk(MOUNT, 2422 "NFS4: Too many RPC auth flavours specified\n"); 2423 return -EINVAL; 2424 } 2425 2426 if (args->client_address == NULL) { 2427 dfprintk(MOUNT, 2428 "NFS4: mount program didn't pass callback address\n"); 2429 return -EINVAL; 2430 } 2431 2432 return nfs_parse_devname(dev_name, 2433 &args->nfs_server.hostname, 2434 NFS4_MAXNAMLEN, 2435 &args->nfs_server.export_path, 2436 NFS4_MAXPATHLEN); 2437 } 2438 2439 /* 2440 * Validate NFSv4 mount options 2441 */ 2442 static int nfs4_validate_mount_data(void *options, 2443 struct nfs_parsed_mount_data *args, 2444 const char *dev_name) 2445 { 2446 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2447 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2448 char *c; 2449 2450 if (data == NULL) 2451 goto out_no_data; 2452 2453 switch (data->version) { 2454 case 1: 2455 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2456 goto out_no_address; 2457 if (data->host_addrlen == 0) 2458 goto out_no_address; 2459 args->nfs_server.addrlen = data->host_addrlen; 2460 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2461 return -EFAULT; 2462 if (!nfs_verify_server_address(sap)) 2463 goto out_no_address; 2464 2465 if (data->auth_flavourlen) { 2466 if (data->auth_flavourlen > 1) 2467 goto out_inval_auth; 2468 if (copy_from_user(&args->auth_flavors[0], 2469 data->auth_flavours, 2470 sizeof(args->auth_flavors[0]))) 2471 return -EFAULT; 2472 } 2473 2474 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2475 if (IS_ERR(c)) 2476 return PTR_ERR(c); 2477 args->nfs_server.hostname = c; 2478 2479 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2480 if (IS_ERR(c)) 2481 return PTR_ERR(c); 2482 args->nfs_server.export_path = c; 2483 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2484 2485 c = strndup_user(data->client_addr.data, 16); 2486 if (IS_ERR(c)) 2487 return PTR_ERR(c); 2488 args->client_address = c; 2489 2490 /* 2491 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2492 * can deal with. 2493 */ 2494 2495 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2496 args->rsize = data->rsize; 2497 args->wsize = data->wsize; 2498 args->timeo = data->timeo; 2499 args->retrans = data->retrans; 2500 args->acregmin = data->acregmin; 2501 args->acregmax = data->acregmax; 2502 args->acdirmin = data->acdirmin; 2503 args->acdirmax = data->acdirmax; 2504 args->nfs_server.protocol = data->proto; 2505 nfs_validate_transport_protocol(args); 2506 2507 break; 2508 default: 2509 if (nfs_parse_mount_options((char *)options, args) == 0) 2510 return -EINVAL; 2511 2512 if (!nfs_verify_server_address(sap)) 2513 return -EINVAL; 2514 2515 return nfs4_validate_text_mount_data(options, args, dev_name); 2516 } 2517 2518 return 0; 2519 2520 out_no_data: 2521 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2522 return -EINVAL; 2523 2524 out_inval_auth: 2525 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2526 data->auth_flavourlen); 2527 return -EINVAL; 2528 2529 out_no_address: 2530 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2531 return -EINVAL; 2532 } 2533 2534 /* 2535 * Get the superblock for the NFS4 root partition 2536 */ 2537 static int nfs4_remote_get_sb(struct file_system_type *fs_type, 2538 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2539 { 2540 struct nfs_parsed_mount_data *data = raw_data; 2541 struct super_block *s; 2542 struct nfs_server *server; 2543 struct nfs_fh *mntfh; 2544 struct dentry *mntroot; 2545 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2546 struct nfs_sb_mountdata sb_mntdata = { 2547 .mntflags = flags, 2548 }; 2549 int error = -ENOMEM; 2550 2551 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL); 2552 if (data == NULL || mntfh == NULL) 2553 goto out_free_fh; 2554 2555 security_init_mnt_opts(&data->lsm_opts); 2556 2557 /* Get a volume representation */ 2558 server = nfs4_create_server(data, mntfh); 2559 if (IS_ERR(server)) { 2560 error = PTR_ERR(server); 2561 goto out; 2562 } 2563 sb_mntdata.server = server; 2564 2565 if (server->flags & NFS4_MOUNT_UNSHARED) 2566 compare_super = NULL; 2567 2568 /* Get a superblock - note that we may end up sharing one that already exists */ 2569 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2570 if (IS_ERR(s)) { 2571 error = PTR_ERR(s); 2572 goto out_free; 2573 } 2574 2575 if (s->s_fs_info != server) { 2576 nfs_free_server(server); 2577 server = NULL; 2578 } else { 2579 error = nfs_bdi_register(server); 2580 if (error) 2581 goto error_splat_super; 2582 } 2583 2584 if (!s->s_root) { 2585 /* initial superblock/root creation */ 2586 nfs4_fill_super(s); 2587 nfs_fscache_get_super_cookie( 2588 s, data ? data->fscache_uniq : NULL, NULL); 2589 } 2590 2591 mntroot = nfs4_get_root(s, mntfh); 2592 if (IS_ERR(mntroot)) { 2593 error = PTR_ERR(mntroot); 2594 goto error_splat_super; 2595 } 2596 2597 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2598 if (error) 2599 goto error_splat_root; 2600 2601 s->s_flags |= MS_ACTIVE; 2602 mnt->mnt_sb = s; 2603 mnt->mnt_root = mntroot; 2604 error = 0; 2605 2606 out: 2607 security_free_mnt_opts(&data->lsm_opts); 2608 out_free_fh: 2609 kfree(mntfh); 2610 return error; 2611 2612 out_free: 2613 nfs_free_server(server); 2614 goto out; 2615 2616 error_splat_root: 2617 dput(mntroot); 2618 error_splat_super: 2619 deactivate_locked_super(s); 2620 goto out; 2621 } 2622 2623 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2624 int flags, void *data, const char *hostname) 2625 { 2626 struct vfsmount *root_mnt; 2627 char *root_devname; 2628 size_t len; 2629 2630 len = strlen(hostname) + 3; 2631 root_devname = kmalloc(len, GFP_KERNEL); 2632 if (root_devname == NULL) 2633 return ERR_PTR(-ENOMEM); 2634 snprintf(root_devname, len, "%s:/", hostname); 2635 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2636 kfree(root_devname); 2637 return root_mnt; 2638 } 2639 2640 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt) 2641 { 2642 char *page = (char *) __get_free_page(GFP_KERNEL); 2643 char *devname, *tmp; 2644 2645 if (page == NULL) 2646 return; 2647 devname = nfs_path(path->mnt->mnt_devname, 2648 path->mnt->mnt_root, path->dentry, 2649 page, PAGE_SIZE); 2650 if (devname == NULL) 2651 goto out_freepage; 2652 tmp = kstrdup(devname, GFP_KERNEL); 2653 if (tmp == NULL) 2654 goto out_freepage; 2655 kfree(mnt->mnt_devname); 2656 mnt->mnt_devname = tmp; 2657 out_freepage: 2658 free_page((unsigned long)page); 2659 } 2660 2661 static int nfs_follow_remote_path(struct vfsmount *root_mnt, 2662 const char *export_path, struct vfsmount *mnt_target) 2663 { 2664 struct mnt_namespace *ns_private; 2665 struct nameidata nd; 2666 struct super_block *s; 2667 int ret; 2668 2669 ns_private = create_mnt_ns(root_mnt); 2670 ret = PTR_ERR(ns_private); 2671 if (IS_ERR(ns_private)) 2672 goto out_mntput; 2673 2674 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2675 export_path, LOOKUP_FOLLOW, &nd); 2676 2677 put_mnt_ns(ns_private); 2678 2679 if (ret != 0) 2680 goto out_err; 2681 2682 s = nd.path.mnt->mnt_sb; 2683 atomic_inc(&s->s_active); 2684 mnt_target->mnt_sb = s; 2685 mnt_target->mnt_root = dget(nd.path.dentry); 2686 2687 /* Correct the device pathname */ 2688 nfs_fix_devname(&nd.path, mnt_target); 2689 2690 path_put(&nd.path); 2691 down_write(&s->s_umount); 2692 return 0; 2693 out_mntput: 2694 mntput(root_mnt); 2695 out_err: 2696 return ret; 2697 } 2698 2699 static int nfs4_try_mount(int flags, const char *dev_name, 2700 struct nfs_parsed_mount_data *data, 2701 struct vfsmount *mnt) 2702 { 2703 char *export_path; 2704 struct vfsmount *root_mnt; 2705 int error; 2706 2707 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2708 2709 export_path = data->nfs_server.export_path; 2710 data->nfs_server.export_path = "/"; 2711 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2712 data->nfs_server.hostname); 2713 data->nfs_server.export_path = export_path; 2714 2715 error = PTR_ERR(root_mnt); 2716 if (IS_ERR(root_mnt)) 2717 goto out; 2718 2719 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2720 2721 out: 2722 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error, 2723 error != 0 ? " [error]" : ""); 2724 return error; 2725 } 2726 2727 /* 2728 * Get the superblock for an NFS4 mountpoint 2729 */ 2730 static int nfs4_get_sb(struct file_system_type *fs_type, 2731 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 2732 { 2733 struct nfs_parsed_mount_data *data; 2734 int error = -ENOMEM; 2735 2736 data = nfs_alloc_parsed_mount_data(4); 2737 if (data == NULL) 2738 goto out_free_data; 2739 2740 /* Validate the mount data */ 2741 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2742 if (error < 0) 2743 goto out; 2744 2745 error = nfs4_try_mount(flags, dev_name, data, mnt); 2746 2747 out: 2748 kfree(data->client_address); 2749 kfree(data->nfs_server.export_path); 2750 kfree(data->nfs_server.hostname); 2751 kfree(data->fscache_uniq); 2752 out_free_data: 2753 kfree(data); 2754 dprintk("<-- nfs4_get_sb() = %d%s\n", error, 2755 error != 0 ? " [error]" : ""); 2756 return error; 2757 } 2758 2759 static void nfs4_kill_super(struct super_block *sb) 2760 { 2761 struct nfs_server *server = NFS_SB(sb); 2762 2763 dprintk("--> %s\n", __func__); 2764 nfs_super_return_all_delegations(sb); 2765 kill_anon_super(sb); 2766 nfs_fscache_release_super_cookie(sb); 2767 nfs_free_server(server); 2768 dprintk("<-- %s\n", __func__); 2769 } 2770 2771 /* 2772 * Clone an NFS4 server record on xdev traversal (FSID-change) 2773 */ 2774 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 2775 const char *dev_name, void *raw_data, 2776 struct vfsmount *mnt) 2777 { 2778 struct nfs_clone_mount *data = raw_data; 2779 struct super_block *s; 2780 struct nfs_server *server; 2781 struct dentry *mntroot; 2782 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2783 struct nfs_sb_mountdata sb_mntdata = { 2784 .mntflags = flags, 2785 }; 2786 int error; 2787 2788 dprintk("--> nfs4_xdev_get_sb()\n"); 2789 2790 /* create a new volume representation */ 2791 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2792 if (IS_ERR(server)) { 2793 error = PTR_ERR(server); 2794 goto out_err_noserver; 2795 } 2796 sb_mntdata.server = server; 2797 2798 if (server->flags & NFS4_MOUNT_UNSHARED) 2799 compare_super = NULL; 2800 2801 /* Get a superblock - note that we may end up sharing one that already exists */ 2802 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2803 if (IS_ERR(s)) { 2804 error = PTR_ERR(s); 2805 goto out_err_nosb; 2806 } 2807 2808 if (s->s_fs_info != server) { 2809 nfs_free_server(server); 2810 server = NULL; 2811 } else { 2812 error = nfs_bdi_register(server); 2813 if (error) 2814 goto error_splat_super; 2815 } 2816 2817 if (!s->s_root) { 2818 /* initial superblock/root creation */ 2819 nfs4_clone_super(s, data->sb); 2820 nfs_fscache_get_super_cookie(s, NULL, data); 2821 } 2822 2823 mntroot = nfs4_get_root(s, data->fh); 2824 if (IS_ERR(mntroot)) { 2825 error = PTR_ERR(mntroot); 2826 goto error_splat_super; 2827 } 2828 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2829 dput(mntroot); 2830 error = -ESTALE; 2831 goto error_splat_super; 2832 } 2833 2834 s->s_flags |= MS_ACTIVE; 2835 mnt->mnt_sb = s; 2836 mnt->mnt_root = mntroot; 2837 2838 security_sb_clone_mnt_opts(data->sb, s); 2839 2840 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 2841 return 0; 2842 2843 out_err_nosb: 2844 nfs_free_server(server); 2845 out_err_noserver: 2846 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 2847 return error; 2848 2849 error_splat_super: 2850 deactivate_locked_super(s); 2851 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 2852 return error; 2853 } 2854 2855 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type, 2856 int flags, const char *dev_name, void *raw_data, 2857 struct vfsmount *mnt) 2858 { 2859 struct nfs_clone_mount *data = raw_data; 2860 struct super_block *s; 2861 struct nfs_server *server; 2862 struct dentry *mntroot; 2863 struct nfs_fh mntfh; 2864 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2865 struct nfs_sb_mountdata sb_mntdata = { 2866 .mntflags = flags, 2867 }; 2868 int error; 2869 2870 dprintk("--> nfs4_referral_get_sb()\n"); 2871 2872 /* create a new volume representation */ 2873 server = nfs4_create_referral_server(data, &mntfh); 2874 if (IS_ERR(server)) { 2875 error = PTR_ERR(server); 2876 goto out_err_noserver; 2877 } 2878 sb_mntdata.server = server; 2879 2880 if (server->flags & NFS4_MOUNT_UNSHARED) 2881 compare_super = NULL; 2882 2883 /* Get a superblock - note that we may end up sharing one that already exists */ 2884 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2885 if (IS_ERR(s)) { 2886 error = PTR_ERR(s); 2887 goto out_err_nosb; 2888 } 2889 2890 if (s->s_fs_info != server) { 2891 nfs_free_server(server); 2892 server = NULL; 2893 } else { 2894 error = nfs_bdi_register(server); 2895 if (error) 2896 goto error_splat_super; 2897 } 2898 2899 if (!s->s_root) { 2900 /* initial superblock/root creation */ 2901 nfs4_fill_super(s); 2902 nfs_fscache_get_super_cookie(s, NULL, data); 2903 } 2904 2905 mntroot = nfs4_get_root(s, &mntfh); 2906 if (IS_ERR(mntroot)) { 2907 error = PTR_ERR(mntroot); 2908 goto error_splat_super; 2909 } 2910 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2911 dput(mntroot); 2912 error = -ESTALE; 2913 goto error_splat_super; 2914 } 2915 2916 s->s_flags |= MS_ACTIVE; 2917 mnt->mnt_sb = s; 2918 mnt->mnt_root = mntroot; 2919 2920 security_sb_clone_mnt_opts(data->sb, s); 2921 2922 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2923 return 0; 2924 2925 out_err_nosb: 2926 nfs_free_server(server); 2927 out_err_noserver: 2928 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2929 return error; 2930 2931 error_splat_super: 2932 deactivate_locked_super(s); 2933 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2934 return error; 2935 } 2936 2937 /* 2938 * Create an NFS4 server record on referral traversal 2939 */ 2940 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 2941 int flags, const char *dev_name, void *raw_data, 2942 struct vfsmount *mnt) 2943 { 2944 struct nfs_clone_mount *data = raw_data; 2945 char *export_path; 2946 struct vfsmount *root_mnt; 2947 int error; 2948 2949 dprintk("--> nfs4_referral_get_sb()\n"); 2950 2951 export_path = data->mnt_path; 2952 data->mnt_path = "/"; 2953 2954 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 2955 flags, data, data->hostname); 2956 data->mnt_path = export_path; 2957 2958 error = PTR_ERR(root_mnt); 2959 if (IS_ERR(root_mnt)) 2960 goto out; 2961 2962 error = nfs_follow_remote_path(root_mnt, export_path, mnt); 2963 out: 2964 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error, 2965 error != 0 ? " [error]" : ""); 2966 return error; 2967 } 2968 2969 #endif /* CONFIG_NFS_V4 */ 2970