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/seq_file.h> 43 #include <linux/mount.h> 44 #include <linux/mnt_namespace.h> 45 #include <linux/namei.h> 46 #include <linux/nfs_idmap.h> 47 #include <linux/vfs.h> 48 #include <linux/inet.h> 49 #include <linux/in6.h> 50 #include <linux/slab.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 #ifdef CONFIG_NFS_V3 70 #define NFS_DEFAULT_VERSION 3 71 #else 72 #define NFS_DEFAULT_VERSION 2 73 #endif 74 75 enum { 76 /* Mount options that take no arguments */ 77 Opt_soft, Opt_hard, 78 Opt_posix, Opt_noposix, 79 Opt_cto, Opt_nocto, 80 Opt_ac, Opt_noac, 81 Opt_lock, Opt_nolock, 82 Opt_v2, Opt_v3, Opt_v4, 83 Opt_udp, Opt_tcp, Opt_rdma, 84 Opt_acl, Opt_noacl, 85 Opt_rdirplus, Opt_nordirplus, 86 Opt_sharecache, Opt_nosharecache, 87 Opt_resvport, Opt_noresvport, 88 Opt_fscache, Opt_nofscache, 89 90 /* Mount options that take integer arguments */ 91 Opt_port, 92 Opt_rsize, Opt_wsize, Opt_bsize, 93 Opt_timeo, Opt_retrans, 94 Opt_acregmin, Opt_acregmax, 95 Opt_acdirmin, Opt_acdirmax, 96 Opt_actimeo, 97 Opt_namelen, 98 Opt_mountport, 99 Opt_mountvers, 100 Opt_nfsvers, 101 Opt_minorversion, 102 103 /* Mount options that take string arguments */ 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 105 Opt_addr, Opt_mountaddr, Opt_clientaddr, 106 Opt_lookupcache, 107 Opt_fscache_uniq, 108 Opt_local_lock, 109 110 /* Special mount options */ 111 Opt_userspace, Opt_deprecated, Opt_sloppy, 112 113 Opt_err 114 }; 115 116 static const match_table_t nfs_mount_option_tokens = { 117 { Opt_userspace, "bg" }, 118 { Opt_userspace, "fg" }, 119 { Opt_userspace, "retry=%s" }, 120 121 { Opt_sloppy, "sloppy" }, 122 123 { Opt_soft, "soft" }, 124 { Opt_hard, "hard" }, 125 { Opt_deprecated, "intr" }, 126 { Opt_deprecated, "nointr" }, 127 { Opt_posix, "posix" }, 128 { Opt_noposix, "noposix" }, 129 { Opt_cto, "cto" }, 130 { Opt_nocto, "nocto" }, 131 { Opt_ac, "ac" }, 132 { Opt_noac, "noac" }, 133 { Opt_lock, "lock" }, 134 { Opt_nolock, "nolock" }, 135 { Opt_v2, "v2" }, 136 { Opt_v3, "v3" }, 137 { Opt_v4, "v4" }, 138 { Opt_udp, "udp" }, 139 { Opt_tcp, "tcp" }, 140 { Opt_rdma, "rdma" }, 141 { Opt_acl, "acl" }, 142 { Opt_noacl, "noacl" }, 143 { Opt_rdirplus, "rdirplus" }, 144 { Opt_nordirplus, "nordirplus" }, 145 { Opt_sharecache, "sharecache" }, 146 { Opt_nosharecache, "nosharecache" }, 147 { Opt_resvport, "resvport" }, 148 { Opt_noresvport, "noresvport" }, 149 { Opt_fscache, "fsc" }, 150 { Opt_nofscache, "nofsc" }, 151 152 { Opt_port, "port=%s" }, 153 { Opt_rsize, "rsize=%s" }, 154 { Opt_wsize, "wsize=%s" }, 155 { Opt_bsize, "bsize=%s" }, 156 { Opt_timeo, "timeo=%s" }, 157 { Opt_retrans, "retrans=%s" }, 158 { Opt_acregmin, "acregmin=%s" }, 159 { Opt_acregmax, "acregmax=%s" }, 160 { Opt_acdirmin, "acdirmin=%s" }, 161 { Opt_acdirmax, "acdirmax=%s" }, 162 { Opt_actimeo, "actimeo=%s" }, 163 { Opt_namelen, "namlen=%s" }, 164 { Opt_mountport, "mountport=%s" }, 165 { Opt_mountvers, "mountvers=%s" }, 166 { Opt_nfsvers, "nfsvers=%s" }, 167 { Opt_nfsvers, "vers=%s" }, 168 { Opt_minorversion, "minorversion=%s" }, 169 170 { Opt_sec, "sec=%s" }, 171 { Opt_proto, "proto=%s" }, 172 { Opt_mountproto, "mountproto=%s" }, 173 { Opt_addr, "addr=%s" }, 174 { Opt_clientaddr, "clientaddr=%s" }, 175 { Opt_mounthost, "mounthost=%s" }, 176 { Opt_mountaddr, "mountaddr=%s" }, 177 178 { Opt_lookupcache, "lookupcache=%s" }, 179 { Opt_fscache_uniq, "fsc=%s" }, 180 { Opt_local_lock, "local_lock=%s" }, 181 182 { Opt_err, NULL } 183 }; 184 185 enum { 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 187 188 Opt_xprt_err 189 }; 190 191 static const match_table_t nfs_xprt_protocol_tokens = { 192 { Opt_xprt_udp, "udp" }, 193 { Opt_xprt_udp6, "udp6" }, 194 { Opt_xprt_tcp, "tcp" }, 195 { Opt_xprt_tcp6, "tcp6" }, 196 { Opt_xprt_rdma, "rdma" }, 197 198 { Opt_xprt_err, NULL } 199 }; 200 201 enum { 202 Opt_sec_none, Opt_sec_sys, 203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 206 207 Opt_sec_err 208 }; 209 210 static const match_table_t nfs_secflavor_tokens = { 211 { Opt_sec_none, "none" }, 212 { Opt_sec_none, "null" }, 213 { Opt_sec_sys, "sys" }, 214 215 { Opt_sec_krb5, "krb5" }, 216 { Opt_sec_krb5i, "krb5i" }, 217 { Opt_sec_krb5p, "krb5p" }, 218 219 { Opt_sec_lkey, "lkey" }, 220 { Opt_sec_lkeyi, "lkeyi" }, 221 { Opt_sec_lkeyp, "lkeyp" }, 222 223 { Opt_sec_spkm, "spkm3" }, 224 { Opt_sec_spkmi, "spkm3i" }, 225 { Opt_sec_spkmp, "spkm3p" }, 226 227 { Opt_sec_err, NULL } 228 }; 229 230 enum { 231 Opt_lookupcache_all, Opt_lookupcache_positive, 232 Opt_lookupcache_none, 233 234 Opt_lookupcache_err 235 }; 236 237 static match_table_t nfs_lookupcache_tokens = { 238 { Opt_lookupcache_all, "all" }, 239 { Opt_lookupcache_positive, "pos" }, 240 { Opt_lookupcache_positive, "positive" }, 241 { Opt_lookupcache_none, "none" }, 242 243 { Opt_lookupcache_err, NULL } 244 }; 245 246 enum { 247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 248 Opt_local_lock_none, 249 250 Opt_local_lock_err 251 }; 252 253 static match_table_t nfs_local_lock_tokens = { 254 { Opt_local_lock_all, "all" }, 255 { Opt_local_lock_flock, "flock" }, 256 { Opt_local_lock_posix, "posix" }, 257 { Opt_local_lock_none, "none" }, 258 259 { Opt_local_lock_err, NULL } 260 }; 261 262 263 static void nfs_umount_begin(struct super_block *); 264 static int nfs_statfs(struct dentry *, struct kstatfs *); 265 static int nfs_show_options(struct seq_file *, struct vfsmount *); 266 static int nfs_show_devname(struct seq_file *, struct vfsmount *); 267 static int nfs_show_path(struct seq_file *, struct vfsmount *); 268 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 269 static struct dentry *nfs_fs_mount(struct file_system_type *, 270 int, const char *, void *); 271 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 272 int flags, const char *dev_name, void *raw_data); 273 static void nfs_put_super(struct super_block *); 274 static void nfs_kill_super(struct super_block *); 275 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 276 277 static struct file_system_type nfs_fs_type = { 278 .owner = THIS_MODULE, 279 .name = "nfs", 280 .mount = nfs_fs_mount, 281 .kill_sb = nfs_kill_super, 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 283 }; 284 285 struct file_system_type nfs_xdev_fs_type = { 286 .owner = THIS_MODULE, 287 .name = "nfs", 288 .mount = nfs_xdev_mount, 289 .kill_sb = nfs_kill_super, 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 291 }; 292 293 static const struct super_operations nfs_sops = { 294 .alloc_inode = nfs_alloc_inode, 295 .destroy_inode = nfs_destroy_inode, 296 .write_inode = nfs_write_inode, 297 .put_super = nfs_put_super, 298 .statfs = nfs_statfs, 299 .evict_inode = nfs_evict_inode, 300 .umount_begin = nfs_umount_begin, 301 .show_options = nfs_show_options, 302 .show_devname = nfs_show_devname, 303 .show_path = nfs_show_path, 304 .show_stats = nfs_show_stats, 305 .remount_fs = nfs_remount, 306 }; 307 308 #ifdef CONFIG_NFS_V4 309 static int nfs4_validate_text_mount_data(void *options, 310 struct nfs_parsed_mount_data *args, const char *dev_name); 311 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 312 struct nfs_parsed_mount_data *data); 313 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 314 int flags, const char *dev_name, void *raw_data); 315 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type, 316 int flags, const char *dev_name, void *raw_data); 317 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type, 318 int flags, const char *dev_name, void *raw_data); 319 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 320 int flags, const char *dev_name, void *raw_data); 321 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type, 322 int flags, const char *dev_name, void *raw_data); 323 static void nfs4_kill_super(struct super_block *sb); 324 325 static struct file_system_type nfs4_fs_type = { 326 .owner = THIS_MODULE, 327 .name = "nfs4", 328 .mount = nfs4_mount, 329 .kill_sb = nfs4_kill_super, 330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 331 }; 332 333 static struct file_system_type nfs4_remote_fs_type = { 334 .owner = THIS_MODULE, 335 .name = "nfs4", 336 .mount = nfs4_remote_mount, 337 .kill_sb = nfs4_kill_super, 338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 339 }; 340 341 struct file_system_type nfs4_xdev_fs_type = { 342 .owner = THIS_MODULE, 343 .name = "nfs4", 344 .mount = nfs4_xdev_mount, 345 .kill_sb = nfs4_kill_super, 346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 347 }; 348 349 static struct file_system_type nfs4_remote_referral_fs_type = { 350 .owner = THIS_MODULE, 351 .name = "nfs4", 352 .mount = nfs4_remote_referral_mount, 353 .kill_sb = nfs4_kill_super, 354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 355 }; 356 357 struct file_system_type nfs4_referral_fs_type = { 358 .owner = THIS_MODULE, 359 .name = "nfs4", 360 .mount = nfs4_referral_mount, 361 .kill_sb = nfs4_kill_super, 362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 363 }; 364 365 static const struct super_operations nfs4_sops = { 366 .alloc_inode = nfs_alloc_inode, 367 .destroy_inode = nfs_destroy_inode, 368 .write_inode = nfs_write_inode, 369 .put_super = nfs_put_super, 370 .statfs = nfs_statfs, 371 .evict_inode = nfs4_evict_inode, 372 .umount_begin = nfs_umount_begin, 373 .show_options = nfs_show_options, 374 .show_devname = nfs_show_devname, 375 .show_path = nfs_show_path, 376 .show_stats = nfs_show_stats, 377 .remount_fs = nfs_remount, 378 }; 379 #endif 380 381 static struct shrinker acl_shrinker = { 382 .shrink = nfs_access_cache_shrinker, 383 .seeks = DEFAULT_SEEKS, 384 }; 385 386 /* 387 * Register the NFS filesystems 388 */ 389 int __init register_nfs_fs(void) 390 { 391 int ret; 392 393 ret = register_filesystem(&nfs_fs_type); 394 if (ret < 0) 395 goto error_0; 396 397 ret = nfs_register_sysctl(); 398 if (ret < 0) 399 goto error_1; 400 #ifdef CONFIG_NFS_V4 401 ret = register_filesystem(&nfs4_fs_type); 402 if (ret < 0) 403 goto error_2; 404 #endif 405 register_shrinker(&acl_shrinker); 406 return 0; 407 408 #ifdef CONFIG_NFS_V4 409 error_2: 410 nfs_unregister_sysctl(); 411 #endif 412 error_1: 413 unregister_filesystem(&nfs_fs_type); 414 error_0: 415 return ret; 416 } 417 418 /* 419 * Unregister the NFS filesystems 420 */ 421 void __exit unregister_nfs_fs(void) 422 { 423 unregister_shrinker(&acl_shrinker); 424 #ifdef CONFIG_NFS_V4 425 unregister_filesystem(&nfs4_fs_type); 426 #endif 427 nfs_unregister_sysctl(); 428 unregister_filesystem(&nfs_fs_type); 429 } 430 431 void nfs_sb_active(struct super_block *sb) 432 { 433 struct nfs_server *server = NFS_SB(sb); 434 435 if (atomic_inc_return(&server->active) == 1) 436 atomic_inc(&sb->s_active); 437 } 438 439 void nfs_sb_deactive(struct super_block *sb) 440 { 441 struct nfs_server *server = NFS_SB(sb); 442 443 if (atomic_dec_and_test(&server->active)) 444 deactivate_super(sb); 445 } 446 447 /* 448 * Deliver file system statistics to userspace 449 */ 450 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 451 { 452 struct nfs_server *server = NFS_SB(dentry->d_sb); 453 unsigned char blockbits; 454 unsigned long blockres; 455 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 456 struct nfs_fsstat res; 457 int error = -ENOMEM; 458 459 res.fattr = nfs_alloc_fattr(); 460 if (res.fattr == NULL) 461 goto out_err; 462 463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 464 if (unlikely(error == -ESTALE)) { 465 struct dentry *pd_dentry; 466 467 pd_dentry = dget_parent(dentry); 468 if (pd_dentry != NULL) { 469 nfs_zap_caches(pd_dentry->d_inode); 470 dput(pd_dentry); 471 } 472 } 473 nfs_free_fattr(res.fattr); 474 if (error < 0) 475 goto out_err; 476 477 buf->f_type = NFS_SUPER_MAGIC; 478 479 /* 480 * Current versions of glibc do not correctly handle the 481 * case where f_frsize != f_bsize. Eventually we want to 482 * report the value of wtmult in this field. 483 */ 484 buf->f_frsize = dentry->d_sb->s_blocksize; 485 486 /* 487 * On most *nix systems, f_blocks, f_bfree, and f_bavail 488 * are reported in units of f_frsize. Linux hasn't had 489 * an f_frsize field in its statfs struct until recently, 490 * thus historically Linux's sys_statfs reports these 491 * fields in units of f_bsize. 492 */ 493 buf->f_bsize = dentry->d_sb->s_blocksize; 494 blockbits = dentry->d_sb->s_blocksize_bits; 495 blockres = (1 << blockbits) - 1; 496 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 497 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 498 buf->f_bavail = (res.abytes + blockres) >> blockbits; 499 500 buf->f_files = res.tfiles; 501 buf->f_ffree = res.afiles; 502 503 buf->f_namelen = server->namelen; 504 505 return 0; 506 507 out_err: 508 dprintk("%s: statfs error = %d\n", __func__, -error); 509 return error; 510 } 511 512 /* 513 * Map the security flavour number to a name 514 */ 515 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 516 { 517 static const struct { 518 rpc_authflavor_t flavour; 519 const char *str; 520 } sec_flavours[] = { 521 { RPC_AUTH_NULL, "null" }, 522 { RPC_AUTH_UNIX, "sys" }, 523 { RPC_AUTH_GSS_KRB5, "krb5" }, 524 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 525 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 526 { RPC_AUTH_GSS_LKEY, "lkey" }, 527 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 528 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 529 { RPC_AUTH_GSS_SPKM, "spkm" }, 530 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 531 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 532 { UINT_MAX, "unknown" } 533 }; 534 int i; 535 536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 537 if (sec_flavours[i].flavour == flavour) 538 break; 539 } 540 return sec_flavours[i].str; 541 } 542 543 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 544 int showdefaults) 545 { 546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 547 548 seq_printf(m, ",mountproto="); 549 switch (sap->sa_family) { 550 case AF_INET: 551 switch (nfss->mountd_protocol) { 552 case IPPROTO_UDP: 553 seq_printf(m, RPCBIND_NETID_UDP); 554 break; 555 case IPPROTO_TCP: 556 seq_printf(m, RPCBIND_NETID_TCP); 557 break; 558 default: 559 if (showdefaults) 560 seq_printf(m, "auto"); 561 } 562 break; 563 case AF_INET6: 564 switch (nfss->mountd_protocol) { 565 case IPPROTO_UDP: 566 seq_printf(m, RPCBIND_NETID_UDP6); 567 break; 568 case IPPROTO_TCP: 569 seq_printf(m, RPCBIND_NETID_TCP6); 570 break; 571 default: 572 if (showdefaults) 573 seq_printf(m, "auto"); 574 } 575 break; 576 default: 577 if (showdefaults) 578 seq_printf(m, "auto"); 579 } 580 } 581 582 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 583 int showdefaults) 584 { 585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 586 587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 588 return; 589 590 switch (sap->sa_family) { 591 case AF_INET: { 592 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 594 break; 595 } 596 case AF_INET6: { 597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 599 break; 600 } 601 default: 602 if (showdefaults) 603 seq_printf(m, ",mountaddr=unspecified"); 604 } 605 606 if (nfss->mountd_version || showdefaults) 607 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 608 if ((nfss->mountd_port && 609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 610 showdefaults) 611 seq_printf(m, ",mountport=%u", nfss->mountd_port); 612 613 nfs_show_mountd_netid(m, nfss, showdefaults); 614 } 615 616 #ifdef CONFIG_NFS_V4 617 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 618 int showdefaults) 619 { 620 struct nfs_client *clp = nfss->nfs_client; 621 622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion); 624 } 625 #else 626 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 627 int showdefaults) 628 { 629 } 630 #endif 631 632 /* 633 * Describe the mount options in force on this server representation 634 */ 635 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 636 int showdefaults) 637 { 638 static const struct proc_nfs_info { 639 int flag; 640 const char *str; 641 const char *nostr; 642 } nfs_info[] = { 643 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 644 { NFS_MOUNT_POSIX, ",posix", "" }, 645 { NFS_MOUNT_NOCTO, ",nocto", "" }, 646 { NFS_MOUNT_NOAC, ",noac", "" }, 647 { NFS_MOUNT_NONLM, ",nolock", "" }, 648 { NFS_MOUNT_NOACL, ",noacl", "" }, 649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 652 { 0, NULL, NULL } 653 }; 654 const struct proc_nfs_info *nfs_infop; 655 struct nfs_client *clp = nfss->nfs_client; 656 u32 version = clp->rpc_ops->version; 657 int local_flock, local_fcntl; 658 659 seq_printf(m, ",vers=%u", version); 660 seq_printf(m, ",rsize=%u", nfss->rsize); 661 seq_printf(m, ",wsize=%u", nfss->wsize); 662 if (nfss->bsize != 0) 663 seq_printf(m, ",bsize=%u", nfss->bsize); 664 seq_printf(m, ",namlen=%u", nfss->namelen); 665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 674 if (nfss->flags & nfs_infop->flag) 675 seq_puts(m, nfs_infop->str); 676 else 677 seq_puts(m, nfs_infop->nostr); 678 } 679 seq_printf(m, ",proto=%s", 680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 681 if (version == 4) { 682 if (nfss->port != NFS_PORT) 683 seq_printf(m, ",port=%u", nfss->port); 684 } else 685 if (nfss->port) 686 seq_printf(m, ",port=%u", nfss->port); 687 688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 691 692 if (version != 4) 693 nfs_show_mountd_options(m, nfss, showdefaults); 694 else 695 nfs_show_nfsv4_options(m, nfss, showdefaults); 696 697 if (nfss->options & NFS_OPTION_FSCACHE) 698 seq_printf(m, ",fsc"); 699 700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 702 seq_printf(m, ",lookupcache=none"); 703 else 704 seq_printf(m, ",lookupcache=pos"); 705 } 706 707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 709 710 if (!local_flock && !local_fcntl) 711 seq_printf(m, ",local_lock=none"); 712 else if (local_flock && local_fcntl) 713 seq_printf(m, ",local_lock=all"); 714 else if (local_flock) 715 seq_printf(m, ",local_lock=flock"); 716 else 717 seq_printf(m, ",local_lock=posix"); 718 } 719 720 /* 721 * Describe the mount options on this VFS mountpoint 722 */ 723 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 724 { 725 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 726 727 nfs_show_mount_options(m, nfss, 0); 728 729 seq_printf(m, ",addr=%s", 730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 731 RPC_DISPLAY_ADDR)); 732 733 return 0; 734 } 735 736 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt) 737 { 738 char *page = (char *) __get_free_page(GFP_KERNEL); 739 char *devname, *dummy; 740 int err = 0; 741 if (!page) 742 return -ENOMEM; 743 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE); 744 if (IS_ERR(devname)) 745 err = PTR_ERR(devname); 746 else 747 seq_escape(m, devname, " \t\n\\"); 748 free_page((unsigned long)page); 749 return err; 750 } 751 752 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt) 753 { 754 seq_puts(m, "/"); 755 return 0; 756 } 757 758 /* 759 * Present statistical information for this VFS mountpoint 760 */ 761 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 762 { 763 int i, cpu; 764 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 765 struct rpc_auth *auth = nfss->client->cl_auth; 766 struct nfs_iostats totals = { }; 767 768 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 769 770 /* 771 * Display all mount option settings 772 */ 773 seq_printf(m, "\n\topts:\t"); 774 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 775 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 776 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 777 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 778 nfs_show_mount_options(m, nfss, 1); 779 780 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 781 782 seq_printf(m, "\n\tcaps:\t"); 783 seq_printf(m, "caps=0x%x", nfss->caps); 784 seq_printf(m, ",wtmult=%u", nfss->wtmult); 785 seq_printf(m, ",dtsize=%u", nfss->dtsize); 786 seq_printf(m, ",bsize=%u", nfss->bsize); 787 seq_printf(m, ",namlen=%u", nfss->namelen); 788 789 #ifdef CONFIG_NFS_V4 790 if (nfss->nfs_client->rpc_ops->version == 4) { 791 seq_printf(m, "\n\tnfsv4:\t"); 792 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 793 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 794 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 795 } 796 #endif 797 798 /* 799 * Display security flavor in effect for this mount 800 */ 801 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 802 if (auth->au_flavor) 803 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 804 805 /* 806 * Display superblock I/O counters 807 */ 808 for_each_possible_cpu(cpu) { 809 struct nfs_iostats *stats; 810 811 preempt_disable(); 812 stats = per_cpu_ptr(nfss->io_stats, cpu); 813 814 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 815 totals.events[i] += stats->events[i]; 816 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 817 totals.bytes[i] += stats->bytes[i]; 818 #ifdef CONFIG_NFS_FSCACHE 819 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 820 totals.fscache[i] += stats->fscache[i]; 821 #endif 822 823 preempt_enable(); 824 } 825 826 seq_printf(m, "\n\tevents:\t"); 827 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 828 seq_printf(m, "%lu ", totals.events[i]); 829 seq_printf(m, "\n\tbytes:\t"); 830 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 831 seq_printf(m, "%Lu ", totals.bytes[i]); 832 #ifdef CONFIG_NFS_FSCACHE 833 if (nfss->options & NFS_OPTION_FSCACHE) { 834 seq_printf(m, "\n\tfsc:\t"); 835 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 836 seq_printf(m, "%Lu ", totals.bytes[i]); 837 } 838 #endif 839 seq_printf(m, "\n"); 840 841 rpc_print_iostats(m, nfss->client); 842 843 return 0; 844 } 845 846 /* 847 * Begin unmount by attempting to remove all automounted mountpoints we added 848 * in response to xdev traversals and referrals 849 */ 850 static void nfs_umount_begin(struct super_block *sb) 851 { 852 struct nfs_server *server; 853 struct rpc_clnt *rpc; 854 855 server = NFS_SB(sb); 856 /* -EIO all pending I/O */ 857 rpc = server->client_acl; 858 if (!IS_ERR(rpc)) 859 rpc_killall_tasks(rpc); 860 rpc = server->client; 861 if (!IS_ERR(rpc)) 862 rpc_killall_tasks(rpc); 863 } 864 865 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version) 866 { 867 struct nfs_parsed_mount_data *data; 868 869 data = kzalloc(sizeof(*data), GFP_KERNEL); 870 if (data) { 871 data->acregmin = NFS_DEF_ACREGMIN; 872 data->acregmax = NFS_DEF_ACREGMAX; 873 data->acdirmin = NFS_DEF_ACDIRMIN; 874 data->acdirmax = NFS_DEF_ACDIRMAX; 875 data->mount_server.port = NFS_UNSPEC_PORT; 876 data->nfs_server.port = NFS_UNSPEC_PORT; 877 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 878 data->auth_flavors[0] = RPC_AUTH_UNIX; 879 data->auth_flavor_len = 1; 880 data->version = version; 881 data->minorversion = 0; 882 } 883 return data; 884 } 885 886 /* 887 * Sanity-check a server address provided by the mount command. 888 * 889 * Address family must be initialized, and address must not be 890 * the ANY address for that family. 891 */ 892 static int nfs_verify_server_address(struct sockaddr *addr) 893 { 894 switch (addr->sa_family) { 895 case AF_INET: { 896 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 897 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 898 } 899 case AF_INET6: { 900 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 901 return !ipv6_addr_any(sa); 902 } 903 } 904 905 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 906 return 0; 907 } 908 909 /* 910 * Select between a default port value and a user-specified port value. 911 * If a zero value is set, then autobind will be used. 912 */ 913 static void nfs_set_port(struct sockaddr *sap, int *port, 914 const unsigned short default_port) 915 { 916 if (*port == NFS_UNSPEC_PORT) 917 *port = default_port; 918 919 rpc_set_port(sap, *port); 920 } 921 922 /* 923 * Sanity check the NFS transport protocol. 924 * 925 */ 926 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 927 { 928 switch (mnt->nfs_server.protocol) { 929 case XPRT_TRANSPORT_UDP: 930 case XPRT_TRANSPORT_TCP: 931 case XPRT_TRANSPORT_RDMA: 932 break; 933 default: 934 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 935 } 936 } 937 938 /* 939 * For text based NFSv2/v3 mounts, the mount protocol transport default 940 * settings should depend upon the specified NFS transport. 941 */ 942 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 943 { 944 nfs_validate_transport_protocol(mnt); 945 946 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 947 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 948 return; 949 switch (mnt->nfs_server.protocol) { 950 case XPRT_TRANSPORT_UDP: 951 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 952 break; 953 case XPRT_TRANSPORT_TCP: 954 case XPRT_TRANSPORT_RDMA: 955 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 956 } 957 } 958 959 /* 960 * Parse the value of the 'sec=' option. 961 */ 962 static int nfs_parse_security_flavors(char *value, 963 struct nfs_parsed_mount_data *mnt) 964 { 965 substring_t args[MAX_OPT_ARGS]; 966 967 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 968 969 switch (match_token(value, nfs_secflavor_tokens, args)) { 970 case Opt_sec_none: 971 mnt->auth_flavors[0] = RPC_AUTH_NULL; 972 break; 973 case Opt_sec_sys: 974 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 975 break; 976 case Opt_sec_krb5: 977 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 978 break; 979 case Opt_sec_krb5i: 980 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 981 break; 982 case Opt_sec_krb5p: 983 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 984 break; 985 case Opt_sec_lkey: 986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 987 break; 988 case Opt_sec_lkeyi: 989 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 990 break; 991 case Opt_sec_lkeyp: 992 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 993 break; 994 case Opt_sec_spkm: 995 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 996 break; 997 case Opt_sec_spkmi: 998 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 999 break; 1000 case Opt_sec_spkmp: 1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1002 break; 1003 default: 1004 return 0; 1005 } 1006 1007 mnt->auth_flavor_len = 1; 1008 return 1; 1009 } 1010 1011 static int nfs_get_option_str(substring_t args[], char **option) 1012 { 1013 kfree(*option); 1014 *option = match_strdup(args); 1015 return !option; 1016 } 1017 1018 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1019 { 1020 int rc; 1021 char *string; 1022 1023 string = match_strdup(args); 1024 if (string == NULL) 1025 return -ENOMEM; 1026 rc = strict_strtoul(string, 10, option); 1027 kfree(string); 1028 1029 return rc; 1030 } 1031 1032 /* 1033 * Error-check and convert a string of mount options from user space into 1034 * a data structure. The whole mount string is processed; bad options are 1035 * skipped as they are encountered. If there were no errors, return 1; 1036 * otherwise return 0 (zero). 1037 */ 1038 static int nfs_parse_mount_options(char *raw, 1039 struct nfs_parsed_mount_data *mnt) 1040 { 1041 char *p, *string, *secdata; 1042 int rc, sloppy = 0, invalid_option = 0; 1043 unsigned short protofamily = AF_UNSPEC; 1044 unsigned short mountfamily = AF_UNSPEC; 1045 1046 if (!raw) { 1047 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1048 return 1; 1049 } 1050 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1051 1052 secdata = alloc_secdata(); 1053 if (!secdata) 1054 goto out_nomem; 1055 1056 rc = security_sb_copy_data(raw, secdata); 1057 if (rc) 1058 goto out_security_failure; 1059 1060 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1061 if (rc) 1062 goto out_security_failure; 1063 1064 free_secdata(secdata); 1065 1066 while ((p = strsep(&raw, ",")) != NULL) { 1067 substring_t args[MAX_OPT_ARGS]; 1068 unsigned long option; 1069 int token; 1070 1071 if (!*p) 1072 continue; 1073 1074 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1075 1076 token = match_token(p, nfs_mount_option_tokens, args); 1077 switch (token) { 1078 1079 /* 1080 * boolean options: foo/nofoo 1081 */ 1082 case Opt_soft: 1083 mnt->flags |= NFS_MOUNT_SOFT; 1084 break; 1085 case Opt_hard: 1086 mnt->flags &= ~NFS_MOUNT_SOFT; 1087 break; 1088 case Opt_posix: 1089 mnt->flags |= NFS_MOUNT_POSIX; 1090 break; 1091 case Opt_noposix: 1092 mnt->flags &= ~NFS_MOUNT_POSIX; 1093 break; 1094 case Opt_cto: 1095 mnt->flags &= ~NFS_MOUNT_NOCTO; 1096 break; 1097 case Opt_nocto: 1098 mnt->flags |= NFS_MOUNT_NOCTO; 1099 break; 1100 case Opt_ac: 1101 mnt->flags &= ~NFS_MOUNT_NOAC; 1102 break; 1103 case Opt_noac: 1104 mnt->flags |= NFS_MOUNT_NOAC; 1105 break; 1106 case Opt_lock: 1107 mnt->flags &= ~NFS_MOUNT_NONLM; 1108 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1109 NFS_MOUNT_LOCAL_FCNTL); 1110 break; 1111 case Opt_nolock: 1112 mnt->flags |= NFS_MOUNT_NONLM; 1113 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1114 NFS_MOUNT_LOCAL_FCNTL); 1115 break; 1116 case Opt_v2: 1117 mnt->flags &= ~NFS_MOUNT_VER3; 1118 mnt->version = 2; 1119 break; 1120 case Opt_v3: 1121 mnt->flags |= NFS_MOUNT_VER3; 1122 mnt->version = 3; 1123 break; 1124 case Opt_v4: 1125 mnt->flags &= ~NFS_MOUNT_VER3; 1126 mnt->version = 4; 1127 break; 1128 case Opt_udp: 1129 mnt->flags &= ~NFS_MOUNT_TCP; 1130 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1131 break; 1132 case Opt_tcp: 1133 mnt->flags |= NFS_MOUNT_TCP; 1134 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1135 break; 1136 case Opt_rdma: 1137 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1138 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1139 xprt_load_transport(p); 1140 break; 1141 case Opt_acl: 1142 mnt->flags &= ~NFS_MOUNT_NOACL; 1143 break; 1144 case Opt_noacl: 1145 mnt->flags |= NFS_MOUNT_NOACL; 1146 break; 1147 case Opt_rdirplus: 1148 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1149 break; 1150 case Opt_nordirplus: 1151 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1152 break; 1153 case Opt_sharecache: 1154 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1155 break; 1156 case Opt_nosharecache: 1157 mnt->flags |= NFS_MOUNT_UNSHARED; 1158 break; 1159 case Opt_resvport: 1160 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1161 break; 1162 case Opt_noresvport: 1163 mnt->flags |= NFS_MOUNT_NORESVPORT; 1164 break; 1165 case Opt_fscache: 1166 mnt->options |= NFS_OPTION_FSCACHE; 1167 kfree(mnt->fscache_uniq); 1168 mnt->fscache_uniq = NULL; 1169 break; 1170 case Opt_nofscache: 1171 mnt->options &= ~NFS_OPTION_FSCACHE; 1172 kfree(mnt->fscache_uniq); 1173 mnt->fscache_uniq = NULL; 1174 break; 1175 1176 /* 1177 * options that take numeric values 1178 */ 1179 case Opt_port: 1180 if (nfs_get_option_ul(args, &option) || 1181 option > USHRT_MAX) 1182 goto out_invalid_value; 1183 mnt->nfs_server.port = option; 1184 break; 1185 case Opt_rsize: 1186 if (nfs_get_option_ul(args, &option)) 1187 goto out_invalid_value; 1188 mnt->rsize = option; 1189 break; 1190 case Opt_wsize: 1191 if (nfs_get_option_ul(args, &option)) 1192 goto out_invalid_value; 1193 mnt->wsize = option; 1194 break; 1195 case Opt_bsize: 1196 if (nfs_get_option_ul(args, &option)) 1197 goto out_invalid_value; 1198 mnt->bsize = option; 1199 break; 1200 case Opt_timeo: 1201 if (nfs_get_option_ul(args, &option) || option == 0) 1202 goto out_invalid_value; 1203 mnt->timeo = option; 1204 break; 1205 case Opt_retrans: 1206 if (nfs_get_option_ul(args, &option) || option == 0) 1207 goto out_invalid_value; 1208 mnt->retrans = option; 1209 break; 1210 case Opt_acregmin: 1211 if (nfs_get_option_ul(args, &option)) 1212 goto out_invalid_value; 1213 mnt->acregmin = option; 1214 break; 1215 case Opt_acregmax: 1216 if (nfs_get_option_ul(args, &option)) 1217 goto out_invalid_value; 1218 mnt->acregmax = option; 1219 break; 1220 case Opt_acdirmin: 1221 if (nfs_get_option_ul(args, &option)) 1222 goto out_invalid_value; 1223 mnt->acdirmin = option; 1224 break; 1225 case Opt_acdirmax: 1226 if (nfs_get_option_ul(args, &option)) 1227 goto out_invalid_value; 1228 mnt->acdirmax = option; 1229 break; 1230 case Opt_actimeo: 1231 if (nfs_get_option_ul(args, &option)) 1232 goto out_invalid_value; 1233 mnt->acregmin = mnt->acregmax = 1234 mnt->acdirmin = mnt->acdirmax = option; 1235 break; 1236 case Opt_namelen: 1237 if (nfs_get_option_ul(args, &option)) 1238 goto out_invalid_value; 1239 mnt->namlen = option; 1240 break; 1241 case Opt_mountport: 1242 if (nfs_get_option_ul(args, &option) || 1243 option > USHRT_MAX) 1244 goto out_invalid_value; 1245 mnt->mount_server.port = option; 1246 break; 1247 case Opt_mountvers: 1248 if (nfs_get_option_ul(args, &option) || 1249 option < NFS_MNT_VERSION || 1250 option > NFS_MNT3_VERSION) 1251 goto out_invalid_value; 1252 mnt->mount_server.version = option; 1253 break; 1254 case Opt_nfsvers: 1255 if (nfs_get_option_ul(args, &option)) 1256 goto out_invalid_value; 1257 switch (option) { 1258 case NFS2_VERSION: 1259 mnt->flags &= ~NFS_MOUNT_VER3; 1260 mnt->version = 2; 1261 break; 1262 case NFS3_VERSION: 1263 mnt->flags |= NFS_MOUNT_VER3; 1264 mnt->version = 3; 1265 break; 1266 case NFS4_VERSION: 1267 mnt->flags &= ~NFS_MOUNT_VER3; 1268 mnt->version = 4; 1269 break; 1270 default: 1271 goto out_invalid_value; 1272 } 1273 break; 1274 case Opt_minorversion: 1275 if (nfs_get_option_ul(args, &option)) 1276 goto out_invalid_value; 1277 if (option > NFS4_MAX_MINOR_VERSION) 1278 goto out_invalid_value; 1279 mnt->minorversion = option; 1280 break; 1281 1282 /* 1283 * options that take text values 1284 */ 1285 case Opt_sec: 1286 string = match_strdup(args); 1287 if (string == NULL) 1288 goto out_nomem; 1289 rc = nfs_parse_security_flavors(string, mnt); 1290 kfree(string); 1291 if (!rc) { 1292 dfprintk(MOUNT, "NFS: unrecognized " 1293 "security flavor\n"); 1294 return 0; 1295 } 1296 break; 1297 case Opt_proto: 1298 string = match_strdup(args); 1299 if (string == NULL) 1300 goto out_nomem; 1301 token = match_token(string, 1302 nfs_xprt_protocol_tokens, args); 1303 1304 protofamily = AF_INET; 1305 switch (token) { 1306 case Opt_xprt_udp6: 1307 protofamily = AF_INET6; 1308 case Opt_xprt_udp: 1309 mnt->flags &= ~NFS_MOUNT_TCP; 1310 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1311 break; 1312 case Opt_xprt_tcp6: 1313 protofamily = AF_INET6; 1314 case Opt_xprt_tcp: 1315 mnt->flags |= NFS_MOUNT_TCP; 1316 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1317 break; 1318 case Opt_xprt_rdma: 1319 /* vector side protocols to TCP */ 1320 mnt->flags |= NFS_MOUNT_TCP; 1321 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1322 xprt_load_transport(string); 1323 break; 1324 default: 1325 dfprintk(MOUNT, "NFS: unrecognized " 1326 "transport protocol\n"); 1327 kfree(string); 1328 return 0; 1329 } 1330 kfree(string); 1331 break; 1332 case Opt_mountproto: 1333 string = match_strdup(args); 1334 if (string == NULL) 1335 goto out_nomem; 1336 token = match_token(string, 1337 nfs_xprt_protocol_tokens, args); 1338 kfree(string); 1339 1340 mountfamily = AF_INET; 1341 switch (token) { 1342 case Opt_xprt_udp6: 1343 mountfamily = AF_INET6; 1344 case Opt_xprt_udp: 1345 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1346 break; 1347 case Opt_xprt_tcp6: 1348 mountfamily = AF_INET6; 1349 case Opt_xprt_tcp: 1350 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1351 break; 1352 case Opt_xprt_rdma: /* not used for side protocols */ 1353 default: 1354 dfprintk(MOUNT, "NFS: unrecognized " 1355 "transport protocol\n"); 1356 return 0; 1357 } 1358 break; 1359 case Opt_addr: 1360 string = match_strdup(args); 1361 if (string == NULL) 1362 goto out_nomem; 1363 mnt->nfs_server.addrlen = 1364 rpc_pton(string, strlen(string), 1365 (struct sockaddr *) 1366 &mnt->nfs_server.address, 1367 sizeof(mnt->nfs_server.address)); 1368 kfree(string); 1369 if (mnt->nfs_server.addrlen == 0) 1370 goto out_invalid_address; 1371 break; 1372 case Opt_clientaddr: 1373 if (nfs_get_option_str(args, &mnt->client_address)) 1374 goto out_nomem; 1375 break; 1376 case Opt_mounthost: 1377 if (nfs_get_option_str(args, 1378 &mnt->mount_server.hostname)) 1379 goto out_nomem; 1380 break; 1381 case Opt_mountaddr: 1382 string = match_strdup(args); 1383 if (string == NULL) 1384 goto out_nomem; 1385 mnt->mount_server.addrlen = 1386 rpc_pton(string, strlen(string), 1387 (struct sockaddr *) 1388 &mnt->mount_server.address, 1389 sizeof(mnt->mount_server.address)); 1390 kfree(string); 1391 if (mnt->mount_server.addrlen == 0) 1392 goto out_invalid_address; 1393 break; 1394 case Opt_lookupcache: 1395 string = match_strdup(args); 1396 if (string == NULL) 1397 goto out_nomem; 1398 token = match_token(string, 1399 nfs_lookupcache_tokens, args); 1400 kfree(string); 1401 switch (token) { 1402 case Opt_lookupcache_all: 1403 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1404 break; 1405 case Opt_lookupcache_positive: 1406 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1407 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1408 break; 1409 case Opt_lookupcache_none: 1410 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1411 break; 1412 default: 1413 dfprintk(MOUNT, "NFS: invalid " 1414 "lookupcache argument\n"); 1415 return 0; 1416 }; 1417 break; 1418 case Opt_fscache_uniq: 1419 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1420 goto out_nomem; 1421 mnt->options |= NFS_OPTION_FSCACHE; 1422 break; 1423 case Opt_local_lock: 1424 string = match_strdup(args); 1425 if (string == NULL) 1426 goto out_nomem; 1427 token = match_token(string, nfs_local_lock_tokens, 1428 args); 1429 kfree(string); 1430 switch (token) { 1431 case Opt_local_lock_all: 1432 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1433 NFS_MOUNT_LOCAL_FCNTL); 1434 break; 1435 case Opt_local_lock_flock: 1436 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1437 break; 1438 case Opt_local_lock_posix: 1439 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1440 break; 1441 case Opt_local_lock_none: 1442 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1443 NFS_MOUNT_LOCAL_FCNTL); 1444 break; 1445 default: 1446 dfprintk(MOUNT, "NFS: invalid " 1447 "local_lock argument\n"); 1448 return 0; 1449 }; 1450 break; 1451 1452 /* 1453 * Special options 1454 */ 1455 case Opt_sloppy: 1456 sloppy = 1; 1457 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1458 break; 1459 case Opt_userspace: 1460 case Opt_deprecated: 1461 dfprintk(MOUNT, "NFS: ignoring mount option " 1462 "'%s'\n", p); 1463 break; 1464 1465 default: 1466 invalid_option = 1; 1467 dfprintk(MOUNT, "NFS: unrecognized mount option " 1468 "'%s'\n", p); 1469 } 1470 } 1471 1472 if (!sloppy && invalid_option) 1473 return 0; 1474 1475 /* 1476 * verify that any proto=/mountproto= options match the address 1477 * familiies in the addr=/mountaddr= options. 1478 */ 1479 if (protofamily != AF_UNSPEC && 1480 protofamily != mnt->nfs_server.address.ss_family) 1481 goto out_proto_mismatch; 1482 1483 if (mountfamily != AF_UNSPEC) { 1484 if (mnt->mount_server.addrlen) { 1485 if (mountfamily != mnt->mount_server.address.ss_family) 1486 goto out_mountproto_mismatch; 1487 } else { 1488 if (mountfamily != mnt->nfs_server.address.ss_family) 1489 goto out_mountproto_mismatch; 1490 } 1491 } 1492 1493 return 1; 1494 1495 out_mountproto_mismatch: 1496 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1497 "option\n"); 1498 return 0; 1499 out_proto_mismatch: 1500 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1501 return 0; 1502 out_invalid_address: 1503 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1504 return 0; 1505 out_invalid_value: 1506 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1507 return 0; 1508 out_nomem: 1509 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1510 return 0; 1511 out_security_failure: 1512 free_secdata(secdata); 1513 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1514 return 0; 1515 } 1516 1517 /* 1518 * Match the requested auth flavors with the list returned by 1519 * the server. Returns zero and sets the mount's authentication 1520 * flavor on success; returns -EACCES if server does not support 1521 * the requested flavor. 1522 */ 1523 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1524 struct nfs_mount_request *request) 1525 { 1526 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1527 1528 /* 1529 * Certain releases of Linux's mountd return an empty 1530 * flavor list. To prevent behavioral regression with 1531 * these servers (ie. rejecting mounts that used to 1532 * succeed), revert to pre-2.6.32 behavior (no checking) 1533 * if the returned flavor list is empty. 1534 */ 1535 if (server_authlist_len == 0) 1536 return 0; 1537 1538 /* 1539 * We avoid sophisticated negotiating here, as there are 1540 * plenty of cases where we can get it wrong, providing 1541 * either too little or too much security. 1542 * 1543 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1544 * flavor listed first. However, some servers list 1545 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1546 * preferred default, in args->auth_flavors[0] if user 1547 * didn't specify sec= mount option. 1548 */ 1549 for (i = 0; i < args->auth_flavor_len; i++) 1550 for (j = 0; j < server_authlist_len; j++) 1551 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1552 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1553 request->auth_flavs[j]); 1554 args->auth_flavors[0] = request->auth_flavs[j]; 1555 return 0; 1556 } 1557 1558 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1559 nfs_umount(request); 1560 return -EACCES; 1561 } 1562 1563 /* 1564 * Use the remote server's MOUNT service to request the NFS file handle 1565 * corresponding to the provided path. 1566 */ 1567 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1568 struct nfs_fh *root_fh) 1569 { 1570 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1571 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1572 struct nfs_mount_request request = { 1573 .sap = (struct sockaddr *) 1574 &args->mount_server.address, 1575 .dirpath = args->nfs_server.export_path, 1576 .protocol = args->mount_server.protocol, 1577 .fh = root_fh, 1578 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1579 .auth_flav_len = &server_authlist_len, 1580 .auth_flavs = server_authlist, 1581 }; 1582 int status; 1583 1584 if (args->mount_server.version == 0) { 1585 switch (args->version) { 1586 default: 1587 args->mount_server.version = NFS_MNT3_VERSION; 1588 break; 1589 case 2: 1590 args->mount_server.version = NFS_MNT_VERSION; 1591 } 1592 } 1593 request.version = args->mount_server.version; 1594 1595 if (args->mount_server.hostname) 1596 request.hostname = args->mount_server.hostname; 1597 else 1598 request.hostname = args->nfs_server.hostname; 1599 1600 /* 1601 * Construct the mount server's address. 1602 */ 1603 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1604 memcpy(request.sap, &args->nfs_server.address, 1605 args->nfs_server.addrlen); 1606 args->mount_server.addrlen = args->nfs_server.addrlen; 1607 } 1608 request.salen = args->mount_server.addrlen; 1609 nfs_set_port(request.sap, &args->mount_server.port, 0); 1610 1611 /* 1612 * Now ask the mount server to map our export path 1613 * to a file handle. 1614 */ 1615 status = nfs_mount(&request); 1616 if (status != 0) { 1617 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1618 request.hostname, status); 1619 return status; 1620 } 1621 1622 /* 1623 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1624 */ 1625 if (args->mount_server.version != NFS_MNT3_VERSION) 1626 return 0; 1627 return nfs_walk_authlist(args, &request); 1628 } 1629 1630 /* 1631 * Split "dev_name" into "hostname:export_path". 1632 * 1633 * The leftmost colon demarks the split between the server's hostname 1634 * and the export path. If the hostname starts with a left square 1635 * bracket, then it may contain colons. 1636 * 1637 * Note: caller frees hostname and export path, even on error. 1638 */ 1639 static int nfs_parse_devname(const char *dev_name, 1640 char **hostname, size_t maxnamlen, 1641 char **export_path, size_t maxpathlen) 1642 { 1643 size_t len; 1644 char *end; 1645 1646 /* Is the host name protected with square brakcets? */ 1647 if (*dev_name == '[') { 1648 end = strchr(++dev_name, ']'); 1649 if (end == NULL || end[1] != ':') 1650 goto out_bad_devname; 1651 1652 len = end - dev_name; 1653 end++; 1654 } else { 1655 char *comma; 1656 1657 end = strchr(dev_name, ':'); 1658 if (end == NULL) 1659 goto out_bad_devname; 1660 len = end - dev_name; 1661 1662 /* kill possible hostname list: not supported */ 1663 comma = strchr(dev_name, ','); 1664 if (comma != NULL && comma < end) 1665 *comma = 0; 1666 } 1667 1668 if (len > maxnamlen) 1669 goto out_hostname; 1670 1671 /* N.B. caller will free nfs_server.hostname in all cases */ 1672 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1673 if (*hostname == NULL) 1674 goto out_nomem; 1675 len = strlen(++end); 1676 if (len > maxpathlen) 1677 goto out_path; 1678 *export_path = kstrndup(end, len, GFP_KERNEL); 1679 if (!*export_path) 1680 goto out_nomem; 1681 1682 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1683 return 0; 1684 1685 out_bad_devname: 1686 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1687 return -EINVAL; 1688 1689 out_nomem: 1690 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1691 return -ENOMEM; 1692 1693 out_hostname: 1694 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1695 return -ENAMETOOLONG; 1696 1697 out_path: 1698 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1699 return -ENAMETOOLONG; 1700 } 1701 1702 /* 1703 * Validate the NFS2/NFS3 mount data 1704 * - fills in the mount root filehandle 1705 * 1706 * For option strings, user space handles the following behaviors: 1707 * 1708 * + DNS: mapping server host name to IP address ("addr=" option) 1709 * 1710 * + failure mode: how to behave if a mount request can't be handled 1711 * immediately ("fg/bg" option) 1712 * 1713 * + retry: how often to retry a mount request ("retry=" option) 1714 * 1715 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1716 * mountproto=tcp after mountproto=udp, and so on 1717 */ 1718 static int nfs_validate_mount_data(void *options, 1719 struct nfs_parsed_mount_data *args, 1720 struct nfs_fh *mntfh, 1721 const char *dev_name) 1722 { 1723 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1724 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1725 1726 if (data == NULL) 1727 goto out_no_data; 1728 1729 switch (data->version) { 1730 case 1: 1731 data->namlen = 0; 1732 case 2: 1733 data->bsize = 0; 1734 case 3: 1735 if (data->flags & NFS_MOUNT_VER3) 1736 goto out_no_v3; 1737 data->root.size = NFS2_FHSIZE; 1738 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1739 case 4: 1740 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1741 goto out_no_sec; 1742 case 5: 1743 memset(data->context, 0, sizeof(data->context)); 1744 case 6: 1745 if (data->flags & NFS_MOUNT_VER3) { 1746 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1747 goto out_invalid_fh; 1748 mntfh->size = data->root.size; 1749 args->version = 3; 1750 } else { 1751 mntfh->size = NFS2_FHSIZE; 1752 args->version = 2; 1753 } 1754 1755 1756 memcpy(mntfh->data, data->root.data, mntfh->size); 1757 if (mntfh->size < sizeof(mntfh->data)) 1758 memset(mntfh->data + mntfh->size, 0, 1759 sizeof(mntfh->data) - mntfh->size); 1760 1761 /* 1762 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1763 * can deal with. 1764 */ 1765 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1766 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1767 args->rsize = data->rsize; 1768 args->wsize = data->wsize; 1769 args->timeo = data->timeo; 1770 args->retrans = data->retrans; 1771 args->acregmin = data->acregmin; 1772 args->acregmax = data->acregmax; 1773 args->acdirmin = data->acdirmin; 1774 args->acdirmax = data->acdirmax; 1775 1776 memcpy(sap, &data->addr, sizeof(data->addr)); 1777 args->nfs_server.addrlen = sizeof(data->addr); 1778 if (!nfs_verify_server_address(sap)) 1779 goto out_no_address; 1780 1781 if (!(data->flags & NFS_MOUNT_TCP)) 1782 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1783 /* N.B. caller will free nfs_server.hostname in all cases */ 1784 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1785 args->namlen = data->namlen; 1786 args->bsize = data->bsize; 1787 1788 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1789 args->auth_flavors[0] = data->pseudoflavor; 1790 if (!args->nfs_server.hostname) 1791 goto out_nomem; 1792 1793 if (!(data->flags & NFS_MOUNT_NONLM)) 1794 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1795 NFS_MOUNT_LOCAL_FCNTL); 1796 else 1797 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1798 NFS_MOUNT_LOCAL_FCNTL); 1799 /* 1800 * The legacy version 6 binary mount data from userspace has a 1801 * field used only to transport selinux information into the 1802 * the kernel. To continue to support that functionality we 1803 * have a touch of selinux knowledge here in the NFS code. The 1804 * userspace code converted context=blah to just blah so we are 1805 * converting back to the full string selinux understands. 1806 */ 1807 if (data->context[0]){ 1808 #ifdef CONFIG_SECURITY_SELINUX 1809 int rc; 1810 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1811 if (!opts_str) 1812 return -ENOMEM; 1813 strcpy(opts_str, "context="); 1814 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1815 strcat(opts_str, &data->context[0]); 1816 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1817 kfree(opts_str); 1818 if (rc) 1819 return rc; 1820 #else 1821 return -EINVAL; 1822 #endif 1823 } 1824 1825 break; 1826 default: { 1827 int status; 1828 1829 if (nfs_parse_mount_options((char *)options, args) == 0) 1830 return -EINVAL; 1831 1832 if (!nfs_verify_server_address(sap)) 1833 goto out_no_address; 1834 1835 if (args->version == 4) 1836 #ifdef CONFIG_NFS_V4 1837 return nfs4_validate_text_mount_data(options, 1838 args, dev_name); 1839 #else 1840 goto out_v4_not_compiled; 1841 #endif 1842 1843 nfs_set_port(sap, &args->nfs_server.port, 0); 1844 1845 nfs_set_mount_transport_protocol(args); 1846 1847 status = nfs_parse_devname(dev_name, 1848 &args->nfs_server.hostname, 1849 PAGE_SIZE, 1850 &args->nfs_server.export_path, 1851 NFS_MAXPATHLEN); 1852 if (!status) 1853 status = nfs_try_mount(args, mntfh); 1854 1855 kfree(args->nfs_server.export_path); 1856 args->nfs_server.export_path = NULL; 1857 1858 if (status) 1859 return status; 1860 1861 break; 1862 } 1863 } 1864 1865 #ifndef CONFIG_NFS_V3 1866 if (args->version == 3) 1867 goto out_v3_not_compiled; 1868 #endif /* !CONFIG_NFS_V3 */ 1869 1870 return 0; 1871 1872 out_no_data: 1873 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1874 return -EINVAL; 1875 1876 out_no_v3: 1877 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1878 data->version); 1879 return -EINVAL; 1880 1881 out_no_sec: 1882 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1883 return -EINVAL; 1884 1885 #ifndef CONFIG_NFS_V3 1886 out_v3_not_compiled: 1887 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1888 return -EPROTONOSUPPORT; 1889 #endif /* !CONFIG_NFS_V3 */ 1890 1891 #ifndef CONFIG_NFS_V4 1892 out_v4_not_compiled: 1893 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1894 return -EPROTONOSUPPORT; 1895 #endif /* !CONFIG_NFS_V4 */ 1896 1897 out_nomem: 1898 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1899 return -ENOMEM; 1900 1901 out_no_address: 1902 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1903 return -EINVAL; 1904 1905 out_invalid_fh: 1906 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1907 return -EINVAL; 1908 } 1909 1910 static int 1911 nfs_compare_remount_data(struct nfs_server *nfss, 1912 struct nfs_parsed_mount_data *data) 1913 { 1914 if (data->flags != nfss->flags || 1915 data->rsize != nfss->rsize || 1916 data->wsize != nfss->wsize || 1917 data->retrans != nfss->client->cl_timeout->to_retries || 1918 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1919 data->acregmin != nfss->acregmin / HZ || 1920 data->acregmax != nfss->acregmax / HZ || 1921 data->acdirmin != nfss->acdirmin / HZ || 1922 data->acdirmax != nfss->acdirmax / HZ || 1923 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1924 data->nfs_server.port != nfss->port || 1925 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1926 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1927 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1928 return -EINVAL; 1929 1930 return 0; 1931 } 1932 1933 static int 1934 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1935 { 1936 int error; 1937 struct nfs_server *nfss = sb->s_fs_info; 1938 struct nfs_parsed_mount_data *data; 1939 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1940 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1941 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1942 1943 /* 1944 * Userspace mount programs that send binary options generally send 1945 * them populated with default values. We have no way to know which 1946 * ones were explicitly specified. Fall back to legacy behavior and 1947 * just return success. 1948 */ 1949 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1950 (nfsvers <= 3 && (!options || (options->version >= 1 && 1951 options->version <= 6)))) 1952 return 0; 1953 1954 data = kzalloc(sizeof(*data), GFP_KERNEL); 1955 if (data == NULL) 1956 return -ENOMEM; 1957 1958 /* fill out struct with values from existing mount */ 1959 data->flags = nfss->flags; 1960 data->rsize = nfss->rsize; 1961 data->wsize = nfss->wsize; 1962 data->retrans = nfss->client->cl_timeout->to_retries; 1963 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1964 data->acregmin = nfss->acregmin / HZ; 1965 data->acregmax = nfss->acregmax / HZ; 1966 data->acdirmin = nfss->acdirmin / HZ; 1967 data->acdirmax = nfss->acdirmax / HZ; 1968 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1969 data->nfs_server.port = nfss->port; 1970 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1971 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1972 data->nfs_server.addrlen); 1973 1974 /* overwrite those values with any that were specified */ 1975 error = nfs_parse_mount_options((char *)options, data); 1976 if (error < 0) 1977 goto out; 1978 1979 /* compare new mount options with old ones */ 1980 error = nfs_compare_remount_data(nfss, data); 1981 out: 1982 kfree(data); 1983 return error; 1984 } 1985 1986 /* 1987 * Initialise the common bits of the superblock 1988 */ 1989 static inline void nfs_initialise_sb(struct super_block *sb) 1990 { 1991 struct nfs_server *server = NFS_SB(sb); 1992 1993 sb->s_magic = NFS_SUPER_MAGIC; 1994 1995 /* We probably want something more informative here */ 1996 snprintf(sb->s_id, sizeof(sb->s_id), 1997 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1998 1999 if (sb->s_blocksize == 0) 2000 sb->s_blocksize = nfs_block_bits(server->wsize, 2001 &sb->s_blocksize_bits); 2002 2003 if (server->flags & NFS_MOUNT_NOAC) 2004 sb->s_flags |= MS_SYNCHRONOUS; 2005 2006 sb->s_bdi = &server->backing_dev_info; 2007 2008 nfs_super_set_maxbytes(sb, server->maxfilesize); 2009 } 2010 2011 /* 2012 * Finish setting up an NFS2/3 superblock 2013 */ 2014 static void nfs_fill_super(struct super_block *sb, 2015 struct nfs_parsed_mount_data *data) 2016 { 2017 struct nfs_server *server = NFS_SB(sb); 2018 2019 sb->s_blocksize_bits = 0; 2020 sb->s_blocksize = 0; 2021 if (data->bsize) 2022 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2023 2024 if (server->nfs_client->rpc_ops->version == 3) { 2025 /* The VFS shouldn't apply the umask to mode bits. We will do 2026 * so ourselves when necessary. 2027 */ 2028 sb->s_flags |= MS_POSIXACL; 2029 sb->s_time_gran = 1; 2030 } 2031 2032 sb->s_op = &nfs_sops; 2033 nfs_initialise_sb(sb); 2034 } 2035 2036 /* 2037 * Finish setting up a cloned NFS2/3 superblock 2038 */ 2039 static void nfs_clone_super(struct super_block *sb, 2040 const struct super_block *old_sb) 2041 { 2042 struct nfs_server *server = NFS_SB(sb); 2043 2044 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2045 sb->s_blocksize = old_sb->s_blocksize; 2046 sb->s_maxbytes = old_sb->s_maxbytes; 2047 2048 if (server->nfs_client->rpc_ops->version == 3) { 2049 /* The VFS shouldn't apply the umask to mode bits. We will do 2050 * so ourselves when necessary. 2051 */ 2052 sb->s_flags |= MS_POSIXACL; 2053 sb->s_time_gran = 1; 2054 } 2055 2056 sb->s_op = old_sb->s_op; 2057 nfs_initialise_sb(sb); 2058 } 2059 2060 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2061 { 2062 const struct nfs_server *a = s->s_fs_info; 2063 const struct rpc_clnt *clnt_a = a->client; 2064 const struct rpc_clnt *clnt_b = b->client; 2065 2066 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2067 goto Ebusy; 2068 if (a->nfs_client != b->nfs_client) 2069 goto Ebusy; 2070 if (a->flags != b->flags) 2071 goto Ebusy; 2072 if (a->wsize != b->wsize) 2073 goto Ebusy; 2074 if (a->rsize != b->rsize) 2075 goto Ebusy; 2076 if (a->acregmin != b->acregmin) 2077 goto Ebusy; 2078 if (a->acregmax != b->acregmax) 2079 goto Ebusy; 2080 if (a->acdirmin != b->acdirmin) 2081 goto Ebusy; 2082 if (a->acdirmax != b->acdirmax) 2083 goto Ebusy; 2084 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2085 goto Ebusy; 2086 return 1; 2087 Ebusy: 2088 return 0; 2089 } 2090 2091 struct nfs_sb_mountdata { 2092 struct nfs_server *server; 2093 int mntflags; 2094 }; 2095 2096 static int nfs_set_super(struct super_block *s, void *data) 2097 { 2098 struct nfs_sb_mountdata *sb_mntdata = data; 2099 struct nfs_server *server = sb_mntdata->server; 2100 int ret; 2101 2102 s->s_flags = sb_mntdata->mntflags; 2103 s->s_fs_info = server; 2104 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2105 ret = set_anon_super(s, server); 2106 if (ret == 0) 2107 server->s_dev = s->s_dev; 2108 return ret; 2109 } 2110 2111 static int nfs_compare_super_address(struct nfs_server *server1, 2112 struct nfs_server *server2) 2113 { 2114 struct sockaddr *sap1, *sap2; 2115 2116 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2117 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2118 2119 if (sap1->sa_family != sap2->sa_family) 2120 return 0; 2121 2122 switch (sap1->sa_family) { 2123 case AF_INET: { 2124 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2125 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2126 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2127 return 0; 2128 if (sin1->sin_port != sin2->sin_port) 2129 return 0; 2130 break; 2131 } 2132 case AF_INET6: { 2133 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2134 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2135 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2136 return 0; 2137 if (sin1->sin6_port != sin2->sin6_port) 2138 return 0; 2139 break; 2140 } 2141 default: 2142 return 0; 2143 } 2144 2145 return 1; 2146 } 2147 2148 static int nfs_compare_super(struct super_block *sb, void *data) 2149 { 2150 struct nfs_sb_mountdata *sb_mntdata = data; 2151 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2152 int mntflags = sb_mntdata->mntflags; 2153 2154 if (!nfs_compare_super_address(old, server)) 2155 return 0; 2156 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2157 if (old->flags & NFS_MOUNT_UNSHARED) 2158 return 0; 2159 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2160 return 0; 2161 return nfs_compare_mount_options(sb, server, mntflags); 2162 } 2163 2164 static int nfs_bdi_register(struct nfs_server *server) 2165 { 2166 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2167 } 2168 2169 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2170 int flags, const char *dev_name, void *raw_data) 2171 { 2172 struct nfs_server *server = NULL; 2173 struct super_block *s; 2174 struct nfs_parsed_mount_data *data; 2175 struct nfs_fh *mntfh; 2176 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2177 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2178 struct nfs_sb_mountdata sb_mntdata = { 2179 .mntflags = flags, 2180 }; 2181 int error; 2182 2183 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); 2184 mntfh = nfs_alloc_fhandle(); 2185 if (data == NULL || mntfh == NULL) 2186 goto out_free_fh; 2187 2188 security_init_mnt_opts(&data->lsm_opts); 2189 2190 /* Validate the mount data */ 2191 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2192 if (error < 0) { 2193 mntroot = ERR_PTR(error); 2194 goto out; 2195 } 2196 2197 #ifdef CONFIG_NFS_V4 2198 if (data->version == 4) { 2199 mntroot = nfs4_try_mount(flags, dev_name, data); 2200 kfree(data->client_address); 2201 kfree(data->nfs_server.export_path); 2202 goto out; 2203 } 2204 #endif /* CONFIG_NFS_V4 */ 2205 2206 /* Get a volume representation */ 2207 server = nfs_create_server(data, mntfh); 2208 if (IS_ERR(server)) { 2209 mntroot = ERR_CAST(server); 2210 goto out; 2211 } 2212 sb_mntdata.server = server; 2213 2214 if (server->flags & NFS_MOUNT_UNSHARED) 2215 compare_super = NULL; 2216 2217 /* Get a superblock - note that we may end up sharing one that already exists */ 2218 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2219 if (IS_ERR(s)) { 2220 mntroot = ERR_CAST(s); 2221 goto out_err_nosb; 2222 } 2223 2224 if (s->s_fs_info != server) { 2225 nfs_free_server(server); 2226 server = NULL; 2227 } else { 2228 error = nfs_bdi_register(server); 2229 if (error) { 2230 mntroot = ERR_PTR(error); 2231 goto error_splat_bdi; 2232 } 2233 } 2234 2235 if (!s->s_root) { 2236 /* initial superblock/root creation */ 2237 nfs_fill_super(s, data); 2238 nfs_fscache_get_super_cookie( 2239 s, data ? data->fscache_uniq : NULL, NULL); 2240 } 2241 2242 mntroot = nfs_get_root(s, mntfh, dev_name); 2243 if (IS_ERR(mntroot)) 2244 goto error_splat_super; 2245 2246 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2247 if (error) 2248 goto error_splat_root; 2249 2250 s->s_flags |= MS_ACTIVE; 2251 2252 out: 2253 kfree(data->nfs_server.hostname); 2254 kfree(data->mount_server.hostname); 2255 kfree(data->fscache_uniq); 2256 security_free_mnt_opts(&data->lsm_opts); 2257 out_free_fh: 2258 nfs_free_fhandle(mntfh); 2259 kfree(data); 2260 return mntroot; 2261 2262 out_err_nosb: 2263 nfs_free_server(server); 2264 goto out; 2265 2266 error_splat_root: 2267 dput(mntroot); 2268 mntroot = ERR_PTR(error); 2269 error_splat_super: 2270 if (server && !s->s_root) 2271 bdi_unregister(&server->backing_dev_info); 2272 error_splat_bdi: 2273 deactivate_locked_super(s); 2274 goto out; 2275 } 2276 2277 /* 2278 * Ensure that we unregister the bdi before kill_anon_super 2279 * releases the device name 2280 */ 2281 static void nfs_put_super(struct super_block *s) 2282 { 2283 struct nfs_server *server = NFS_SB(s); 2284 2285 bdi_unregister(&server->backing_dev_info); 2286 } 2287 2288 /* 2289 * Destroy an NFS2/3 superblock 2290 */ 2291 static void nfs_kill_super(struct super_block *s) 2292 { 2293 struct nfs_server *server = NFS_SB(s); 2294 2295 kill_anon_super(s); 2296 nfs_fscache_release_super_cookie(s); 2297 nfs_free_server(server); 2298 } 2299 2300 /* 2301 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2302 */ 2303 static struct dentry * 2304 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2305 const char *dev_name, void *raw_data) 2306 { 2307 struct nfs_clone_mount *data = raw_data; 2308 struct super_block *s; 2309 struct nfs_server *server; 2310 struct dentry *mntroot; 2311 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2312 struct nfs_sb_mountdata sb_mntdata = { 2313 .mntflags = flags, 2314 }; 2315 int error; 2316 2317 dprintk("--> nfs_xdev_mount()\n"); 2318 2319 /* create a new volume representation */ 2320 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2321 if (IS_ERR(server)) { 2322 error = PTR_ERR(server); 2323 goto out_err_noserver; 2324 } 2325 sb_mntdata.server = server; 2326 2327 if (server->flags & NFS_MOUNT_UNSHARED) 2328 compare_super = NULL; 2329 2330 /* Get a superblock - note that we may end up sharing one that already exists */ 2331 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2332 if (IS_ERR(s)) { 2333 error = PTR_ERR(s); 2334 goto out_err_nosb; 2335 } 2336 2337 if (s->s_fs_info != server) { 2338 nfs_free_server(server); 2339 server = NULL; 2340 } else { 2341 error = nfs_bdi_register(server); 2342 if (error) 2343 goto error_splat_bdi; 2344 } 2345 2346 if (!s->s_root) { 2347 /* initial superblock/root creation */ 2348 nfs_clone_super(s, data->sb); 2349 nfs_fscache_get_super_cookie(s, NULL, data); 2350 } 2351 2352 mntroot = nfs_get_root(s, data->fh, dev_name); 2353 if (IS_ERR(mntroot)) { 2354 error = PTR_ERR(mntroot); 2355 goto error_splat_super; 2356 } 2357 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2358 dput(mntroot); 2359 error = -ESTALE; 2360 goto error_splat_super; 2361 } 2362 2363 s->s_flags |= MS_ACTIVE; 2364 2365 /* clone any lsm security options from the parent to the new sb */ 2366 security_sb_clone_mnt_opts(data->sb, s); 2367 2368 dprintk("<-- nfs_xdev_mount() = 0\n"); 2369 return mntroot; 2370 2371 out_err_nosb: 2372 nfs_free_server(server); 2373 out_err_noserver: 2374 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2375 return ERR_PTR(error); 2376 2377 error_splat_super: 2378 if (server && !s->s_root) 2379 bdi_unregister(&server->backing_dev_info); 2380 error_splat_bdi: 2381 deactivate_locked_super(s); 2382 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2383 return ERR_PTR(error); 2384 } 2385 2386 #ifdef CONFIG_NFS_V4 2387 2388 /* 2389 * Finish setting up a cloned NFS4 superblock 2390 */ 2391 static void nfs4_clone_super(struct super_block *sb, 2392 const struct super_block *old_sb) 2393 { 2394 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2395 sb->s_blocksize = old_sb->s_blocksize; 2396 sb->s_maxbytes = old_sb->s_maxbytes; 2397 sb->s_time_gran = 1; 2398 sb->s_op = old_sb->s_op; 2399 /* 2400 * The VFS shouldn't apply the umask to mode bits. We will do 2401 * so ourselves when necessary. 2402 */ 2403 sb->s_flags |= MS_POSIXACL; 2404 sb->s_xattr = old_sb->s_xattr; 2405 nfs_initialise_sb(sb); 2406 } 2407 2408 /* 2409 * Set up an NFS4 superblock 2410 */ 2411 static void nfs4_fill_super(struct super_block *sb) 2412 { 2413 sb->s_time_gran = 1; 2414 sb->s_op = &nfs4_sops; 2415 /* 2416 * The VFS shouldn't apply the umask to mode bits. We will do 2417 * so ourselves when necessary. 2418 */ 2419 sb->s_flags |= MS_POSIXACL; 2420 sb->s_xattr = nfs4_xattr_handlers; 2421 nfs_initialise_sb(sb); 2422 } 2423 2424 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2425 { 2426 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2427 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2428 } 2429 2430 static int nfs4_validate_text_mount_data(void *options, 2431 struct nfs_parsed_mount_data *args, 2432 const char *dev_name) 2433 { 2434 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2435 2436 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2437 2438 nfs_validate_transport_protocol(args); 2439 2440 nfs4_validate_mount_flags(args); 2441 2442 if (args->version != 4) { 2443 dfprintk(MOUNT, 2444 "NFS4: Illegal mount version\n"); 2445 return -EINVAL; 2446 } 2447 2448 if (args->auth_flavor_len > 1) { 2449 dfprintk(MOUNT, 2450 "NFS4: Too many RPC auth flavours specified\n"); 2451 return -EINVAL; 2452 } 2453 2454 if (args->client_address == NULL) { 2455 dfprintk(MOUNT, 2456 "NFS4: mount program didn't pass callback address\n"); 2457 return -EINVAL; 2458 } 2459 2460 return nfs_parse_devname(dev_name, 2461 &args->nfs_server.hostname, 2462 NFS4_MAXNAMLEN, 2463 &args->nfs_server.export_path, 2464 NFS4_MAXPATHLEN); 2465 } 2466 2467 /* 2468 * Validate NFSv4 mount options 2469 */ 2470 static int nfs4_validate_mount_data(void *options, 2471 struct nfs_parsed_mount_data *args, 2472 const char *dev_name) 2473 { 2474 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2475 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2476 char *c; 2477 2478 if (data == NULL) 2479 goto out_no_data; 2480 2481 switch (data->version) { 2482 case 1: 2483 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2484 goto out_no_address; 2485 if (data->host_addrlen == 0) 2486 goto out_no_address; 2487 args->nfs_server.addrlen = data->host_addrlen; 2488 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2489 return -EFAULT; 2490 if (!nfs_verify_server_address(sap)) 2491 goto out_no_address; 2492 2493 if (data->auth_flavourlen) { 2494 if (data->auth_flavourlen > 1) 2495 goto out_inval_auth; 2496 if (copy_from_user(&args->auth_flavors[0], 2497 data->auth_flavours, 2498 sizeof(args->auth_flavors[0]))) 2499 return -EFAULT; 2500 } 2501 2502 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2503 if (IS_ERR(c)) 2504 return PTR_ERR(c); 2505 args->nfs_server.hostname = c; 2506 2507 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2508 if (IS_ERR(c)) 2509 return PTR_ERR(c); 2510 args->nfs_server.export_path = c; 2511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2512 2513 c = strndup_user(data->client_addr.data, 16); 2514 if (IS_ERR(c)) 2515 return PTR_ERR(c); 2516 args->client_address = c; 2517 2518 /* 2519 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2520 * can deal with. 2521 */ 2522 2523 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2524 args->rsize = data->rsize; 2525 args->wsize = data->wsize; 2526 args->timeo = data->timeo; 2527 args->retrans = data->retrans; 2528 args->acregmin = data->acregmin; 2529 args->acregmax = data->acregmax; 2530 args->acdirmin = data->acdirmin; 2531 args->acdirmax = data->acdirmax; 2532 args->nfs_server.protocol = data->proto; 2533 nfs_validate_transport_protocol(args); 2534 2535 break; 2536 default: 2537 if (nfs_parse_mount_options((char *)options, args) == 0) 2538 return -EINVAL; 2539 2540 if (!nfs_verify_server_address(sap)) 2541 return -EINVAL; 2542 2543 return nfs4_validate_text_mount_data(options, args, dev_name); 2544 } 2545 2546 return 0; 2547 2548 out_no_data: 2549 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2550 return -EINVAL; 2551 2552 out_inval_auth: 2553 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2554 data->auth_flavourlen); 2555 return -EINVAL; 2556 2557 out_no_address: 2558 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2559 return -EINVAL; 2560 } 2561 2562 /* 2563 * Get the superblock for the NFS4 root partition 2564 */ 2565 static struct dentry * 2566 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2567 const char *dev_name, void *raw_data) 2568 { 2569 struct nfs_parsed_mount_data *data = raw_data; 2570 struct super_block *s; 2571 struct nfs_server *server; 2572 struct nfs_fh *mntfh; 2573 struct dentry *mntroot; 2574 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2575 struct nfs_sb_mountdata sb_mntdata = { 2576 .mntflags = flags, 2577 }; 2578 int error = -ENOMEM; 2579 2580 mntfh = nfs_alloc_fhandle(); 2581 if (data == NULL || mntfh == NULL) 2582 goto out_free_fh; 2583 2584 security_init_mnt_opts(&data->lsm_opts); 2585 2586 /* Get a volume representation */ 2587 server = nfs4_create_server(data, mntfh); 2588 if (IS_ERR(server)) { 2589 error = PTR_ERR(server); 2590 goto out; 2591 } 2592 sb_mntdata.server = server; 2593 2594 if (server->flags & NFS4_MOUNT_UNSHARED) 2595 compare_super = NULL; 2596 2597 /* Get a superblock - note that we may end up sharing one that already exists */ 2598 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2599 if (IS_ERR(s)) { 2600 error = PTR_ERR(s); 2601 goto out_free; 2602 } 2603 2604 if (s->s_fs_info != server) { 2605 nfs_free_server(server); 2606 server = NULL; 2607 } else { 2608 error = nfs_bdi_register(server); 2609 if (error) 2610 goto error_splat_bdi; 2611 } 2612 2613 if (!s->s_root) { 2614 /* initial superblock/root creation */ 2615 nfs4_fill_super(s); 2616 nfs_fscache_get_super_cookie( 2617 s, data ? data->fscache_uniq : NULL, NULL); 2618 } 2619 2620 mntroot = nfs4_get_root(s, mntfh, dev_name); 2621 if (IS_ERR(mntroot)) { 2622 error = PTR_ERR(mntroot); 2623 goto error_splat_super; 2624 } 2625 2626 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2627 if (error) 2628 goto error_splat_root; 2629 2630 s->s_flags |= MS_ACTIVE; 2631 2632 security_free_mnt_opts(&data->lsm_opts); 2633 nfs_free_fhandle(mntfh); 2634 return mntroot; 2635 2636 out: 2637 security_free_mnt_opts(&data->lsm_opts); 2638 out_free_fh: 2639 nfs_free_fhandle(mntfh); 2640 return ERR_PTR(error); 2641 2642 out_free: 2643 nfs_free_server(server); 2644 goto out; 2645 2646 error_splat_root: 2647 dput(mntroot); 2648 error_splat_super: 2649 if (server && !s->s_root) 2650 bdi_unregister(&server->backing_dev_info); 2651 error_splat_bdi: 2652 deactivate_locked_super(s); 2653 goto out; 2654 } 2655 2656 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2657 int flags, void *data, const char *hostname) 2658 { 2659 struct vfsmount *root_mnt; 2660 char *root_devname; 2661 size_t len; 2662 2663 len = strlen(hostname) + 3; 2664 root_devname = kmalloc(len, GFP_KERNEL); 2665 if (root_devname == NULL) 2666 return ERR_PTR(-ENOMEM); 2667 snprintf(root_devname, len, "%s:/", hostname); 2668 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2669 kfree(root_devname); 2670 return root_mnt; 2671 } 2672 2673 struct nfs_referral_count { 2674 struct list_head list; 2675 const struct task_struct *task; 2676 unsigned int referral_count; 2677 }; 2678 2679 static LIST_HEAD(nfs_referral_count_list); 2680 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2681 2682 static struct nfs_referral_count *nfs_find_referral_count(void) 2683 { 2684 struct nfs_referral_count *p; 2685 2686 list_for_each_entry(p, &nfs_referral_count_list, list) { 2687 if (p->task == current) 2688 return p; 2689 } 2690 return NULL; 2691 } 2692 2693 #define NFS_MAX_NESTED_REFERRALS 2 2694 2695 static int nfs_referral_loop_protect(void) 2696 { 2697 struct nfs_referral_count *p, *new; 2698 int ret = -ENOMEM; 2699 2700 new = kmalloc(sizeof(*new), GFP_KERNEL); 2701 if (!new) 2702 goto out; 2703 new->task = current; 2704 new->referral_count = 1; 2705 2706 ret = 0; 2707 spin_lock(&nfs_referral_count_list_lock); 2708 p = nfs_find_referral_count(); 2709 if (p != NULL) { 2710 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2711 ret = -ELOOP; 2712 else 2713 p->referral_count++; 2714 } else { 2715 list_add(&new->list, &nfs_referral_count_list); 2716 new = NULL; 2717 } 2718 spin_unlock(&nfs_referral_count_list_lock); 2719 kfree(new); 2720 out: 2721 return ret; 2722 } 2723 2724 static void nfs_referral_loop_unprotect(void) 2725 { 2726 struct nfs_referral_count *p; 2727 2728 spin_lock(&nfs_referral_count_list_lock); 2729 p = nfs_find_referral_count(); 2730 p->referral_count--; 2731 if (p->referral_count == 0) 2732 list_del(&p->list); 2733 else 2734 p = NULL; 2735 spin_unlock(&nfs_referral_count_list_lock); 2736 kfree(p); 2737 } 2738 2739 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, 2740 const char *export_path) 2741 { 2742 struct nameidata *nd = NULL; 2743 struct mnt_namespace *ns_private; 2744 struct super_block *s; 2745 struct dentry *dentry; 2746 int ret; 2747 2748 nd = kmalloc(sizeof(*nd), GFP_KERNEL); 2749 if (nd == NULL) 2750 return ERR_PTR(-ENOMEM); 2751 2752 ns_private = create_mnt_ns(root_mnt); 2753 ret = PTR_ERR(ns_private); 2754 if (IS_ERR(ns_private)) 2755 goto out_mntput; 2756 2757 ret = nfs_referral_loop_protect(); 2758 if (ret != 0) 2759 goto out_put_mnt_ns; 2760 2761 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2762 export_path, LOOKUP_FOLLOW, nd); 2763 2764 nfs_referral_loop_unprotect(); 2765 put_mnt_ns(ns_private); 2766 2767 if (ret != 0) 2768 goto out_err; 2769 2770 s = nd->path.mnt->mnt_sb; 2771 atomic_inc(&s->s_active); 2772 dentry = dget(nd->path.dentry); 2773 2774 path_put(&nd->path); 2775 kfree(nd); 2776 down_write(&s->s_umount); 2777 return dentry; 2778 out_put_mnt_ns: 2779 put_mnt_ns(ns_private); 2780 out_mntput: 2781 mntput(root_mnt); 2782 out_err: 2783 kfree(nd); 2784 return ERR_PTR(ret); 2785 } 2786 2787 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 2788 struct nfs_parsed_mount_data *data) 2789 { 2790 char *export_path; 2791 struct vfsmount *root_mnt; 2792 struct dentry *res; 2793 2794 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2795 2796 export_path = data->nfs_server.export_path; 2797 data->nfs_server.export_path = "/"; 2798 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2799 data->nfs_server.hostname); 2800 data->nfs_server.export_path = export_path; 2801 2802 res = ERR_CAST(root_mnt); 2803 if (!IS_ERR(root_mnt)) 2804 res = nfs_follow_remote_path(root_mnt, export_path); 2805 2806 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", 2807 IS_ERR(res) ? PTR_ERR(res) : 0, 2808 IS_ERR(res) ? " [error]" : ""); 2809 return res; 2810 } 2811 2812 /* 2813 * Get the superblock for an NFS4 mountpoint 2814 */ 2815 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 2816 int flags, const char *dev_name, void *raw_data) 2817 { 2818 struct nfs_parsed_mount_data *data; 2819 int error = -ENOMEM; 2820 struct dentry *res = ERR_PTR(-ENOMEM); 2821 2822 data = nfs_alloc_parsed_mount_data(4); 2823 if (data == NULL) 2824 goto out_free_data; 2825 2826 /* Validate the mount data */ 2827 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2828 if (error < 0) { 2829 res = ERR_PTR(error); 2830 goto out; 2831 } 2832 2833 res = nfs4_try_mount(flags, dev_name, data); 2834 if (IS_ERR(res)) 2835 error = PTR_ERR(res); 2836 2837 out: 2838 kfree(data->client_address); 2839 kfree(data->nfs_server.export_path); 2840 kfree(data->nfs_server.hostname); 2841 kfree(data->fscache_uniq); 2842 out_free_data: 2843 kfree(data); 2844 dprintk("<-- nfs4_mount() = %d%s\n", error, 2845 error != 0 ? " [error]" : ""); 2846 return res; 2847 } 2848 2849 static void nfs4_kill_super(struct super_block *sb) 2850 { 2851 struct nfs_server *server = NFS_SB(sb); 2852 2853 dprintk("--> %s\n", __func__); 2854 nfs_super_return_all_delegations(sb); 2855 kill_anon_super(sb); 2856 nfs_fscache_release_super_cookie(sb); 2857 nfs_free_server(server); 2858 dprintk("<-- %s\n", __func__); 2859 } 2860 2861 /* 2862 * Clone an NFS4 server record on xdev traversal (FSID-change) 2863 */ 2864 static struct dentry * 2865 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2866 const char *dev_name, void *raw_data) 2867 { 2868 struct nfs_clone_mount *data = raw_data; 2869 struct super_block *s; 2870 struct nfs_server *server; 2871 struct dentry *mntroot; 2872 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2873 struct nfs_sb_mountdata sb_mntdata = { 2874 .mntflags = flags, 2875 }; 2876 int error; 2877 2878 dprintk("--> nfs4_xdev_mount()\n"); 2879 2880 /* create a new volume representation */ 2881 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2882 if (IS_ERR(server)) { 2883 error = PTR_ERR(server); 2884 goto out_err_noserver; 2885 } 2886 sb_mntdata.server = server; 2887 2888 if (server->flags & NFS4_MOUNT_UNSHARED) 2889 compare_super = NULL; 2890 2891 /* Get a superblock - note that we may end up sharing one that already exists */ 2892 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2893 if (IS_ERR(s)) { 2894 error = PTR_ERR(s); 2895 goto out_err_nosb; 2896 } 2897 2898 if (s->s_fs_info != server) { 2899 nfs_free_server(server); 2900 server = NULL; 2901 } else { 2902 error = nfs_bdi_register(server); 2903 if (error) 2904 goto error_splat_bdi; 2905 } 2906 2907 if (!s->s_root) { 2908 /* initial superblock/root creation */ 2909 nfs4_clone_super(s, data->sb); 2910 nfs_fscache_get_super_cookie(s, NULL, data); 2911 } 2912 2913 mntroot = nfs4_get_root(s, data->fh, dev_name); 2914 if (IS_ERR(mntroot)) { 2915 error = PTR_ERR(mntroot); 2916 goto error_splat_super; 2917 } 2918 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2919 dput(mntroot); 2920 error = -ESTALE; 2921 goto error_splat_super; 2922 } 2923 2924 s->s_flags |= MS_ACTIVE; 2925 2926 security_sb_clone_mnt_opts(data->sb, s); 2927 2928 dprintk("<-- nfs4_xdev_mount() = 0\n"); 2929 return mntroot; 2930 2931 out_err_nosb: 2932 nfs_free_server(server); 2933 out_err_noserver: 2934 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 2935 return ERR_PTR(error); 2936 2937 error_splat_super: 2938 if (server && !s->s_root) 2939 bdi_unregister(&server->backing_dev_info); 2940 error_splat_bdi: 2941 deactivate_locked_super(s); 2942 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 2943 return ERR_PTR(error); 2944 } 2945 2946 static struct dentry * 2947 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 2948 const char *dev_name, void *raw_data) 2949 { 2950 struct nfs_clone_mount *data = raw_data; 2951 struct super_block *s; 2952 struct nfs_server *server; 2953 struct dentry *mntroot; 2954 struct nfs_fh *mntfh; 2955 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2956 struct nfs_sb_mountdata sb_mntdata = { 2957 .mntflags = flags, 2958 }; 2959 int error = -ENOMEM; 2960 2961 dprintk("--> nfs4_referral_get_sb()\n"); 2962 2963 mntfh = nfs_alloc_fhandle(); 2964 if (mntfh == NULL) 2965 goto out_err_nofh; 2966 2967 /* create a new volume representation */ 2968 server = nfs4_create_referral_server(data, mntfh); 2969 if (IS_ERR(server)) { 2970 error = PTR_ERR(server); 2971 goto out_err_noserver; 2972 } 2973 sb_mntdata.server = server; 2974 2975 if (server->flags & NFS4_MOUNT_UNSHARED) 2976 compare_super = NULL; 2977 2978 /* Get a superblock - note that we may end up sharing one that already exists */ 2979 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2980 if (IS_ERR(s)) { 2981 error = PTR_ERR(s); 2982 goto out_err_nosb; 2983 } 2984 2985 if (s->s_fs_info != server) { 2986 nfs_free_server(server); 2987 server = NULL; 2988 } else { 2989 error = nfs_bdi_register(server); 2990 if (error) 2991 goto error_splat_bdi; 2992 } 2993 2994 if (!s->s_root) { 2995 /* initial superblock/root creation */ 2996 nfs4_fill_super(s); 2997 nfs_fscache_get_super_cookie(s, NULL, data); 2998 } 2999 3000 mntroot = nfs4_get_root(s, mntfh, dev_name); 3001 if (IS_ERR(mntroot)) { 3002 error = PTR_ERR(mntroot); 3003 goto error_splat_super; 3004 } 3005 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3006 dput(mntroot); 3007 error = -ESTALE; 3008 goto error_splat_super; 3009 } 3010 3011 s->s_flags |= MS_ACTIVE; 3012 3013 security_sb_clone_mnt_opts(data->sb, s); 3014 3015 nfs_free_fhandle(mntfh); 3016 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3017 return mntroot; 3018 3019 out_err_nosb: 3020 nfs_free_server(server); 3021 out_err_noserver: 3022 nfs_free_fhandle(mntfh); 3023 out_err_nofh: 3024 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3025 return ERR_PTR(error); 3026 3027 error_splat_super: 3028 if (server && !s->s_root) 3029 bdi_unregister(&server->backing_dev_info); 3030 error_splat_bdi: 3031 deactivate_locked_super(s); 3032 nfs_free_fhandle(mntfh); 3033 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3034 return ERR_PTR(error); 3035 } 3036 3037 /* 3038 * Create an NFS4 server record on referral traversal 3039 */ 3040 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 3041 int flags, const char *dev_name, void *raw_data) 3042 { 3043 struct nfs_clone_mount *data = raw_data; 3044 char *export_path; 3045 struct vfsmount *root_mnt; 3046 struct dentry *res; 3047 3048 dprintk("--> nfs4_referral_mount()\n"); 3049 3050 export_path = data->mnt_path; 3051 data->mnt_path = "/"; 3052 3053 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3054 flags, data, data->hostname); 3055 data->mnt_path = export_path; 3056 3057 res = ERR_CAST(root_mnt); 3058 if (!IS_ERR(root_mnt)) 3059 res = nfs_follow_remote_path(root_mnt, export_path); 3060 dprintk("<-- nfs4_referral_mount() = %ld%s\n", 3061 IS_ERR(res) ? PTR_ERR(res) : 0, 3062 IS_ERR(res) ? " [error]" : ""); 3063 return res; 3064 } 3065 3066 #endif /* CONFIG_NFS_V4 */ 3067