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->flags |= NFS_MOUNT_SECFLAVOUR; 1008 mnt->auth_flavor_len = 1; 1009 return 1; 1010 } 1011 1012 static int nfs_get_option_str(substring_t args[], char **option) 1013 { 1014 kfree(*option); 1015 *option = match_strdup(args); 1016 return !option; 1017 } 1018 1019 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1020 { 1021 int rc; 1022 char *string; 1023 1024 string = match_strdup(args); 1025 if (string == NULL) 1026 return -ENOMEM; 1027 rc = strict_strtoul(string, 10, option); 1028 kfree(string); 1029 1030 return rc; 1031 } 1032 1033 /* 1034 * Error-check and convert a string of mount options from user space into 1035 * a data structure. The whole mount string is processed; bad options are 1036 * skipped as they are encountered. If there were no errors, return 1; 1037 * otherwise return 0 (zero). 1038 */ 1039 static int nfs_parse_mount_options(char *raw, 1040 struct nfs_parsed_mount_data *mnt) 1041 { 1042 char *p, *string, *secdata; 1043 int rc, sloppy = 0, invalid_option = 0; 1044 unsigned short protofamily = AF_UNSPEC; 1045 unsigned short mountfamily = AF_UNSPEC; 1046 1047 if (!raw) { 1048 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1049 return 1; 1050 } 1051 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1052 1053 secdata = alloc_secdata(); 1054 if (!secdata) 1055 goto out_nomem; 1056 1057 rc = security_sb_copy_data(raw, secdata); 1058 if (rc) 1059 goto out_security_failure; 1060 1061 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1062 if (rc) 1063 goto out_security_failure; 1064 1065 free_secdata(secdata); 1066 1067 while ((p = strsep(&raw, ",")) != NULL) { 1068 substring_t args[MAX_OPT_ARGS]; 1069 unsigned long option; 1070 int token; 1071 1072 if (!*p) 1073 continue; 1074 1075 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1076 1077 token = match_token(p, nfs_mount_option_tokens, args); 1078 switch (token) { 1079 1080 /* 1081 * boolean options: foo/nofoo 1082 */ 1083 case Opt_soft: 1084 mnt->flags |= NFS_MOUNT_SOFT; 1085 break; 1086 case Opt_hard: 1087 mnt->flags &= ~NFS_MOUNT_SOFT; 1088 break; 1089 case Opt_posix: 1090 mnt->flags |= NFS_MOUNT_POSIX; 1091 break; 1092 case Opt_noposix: 1093 mnt->flags &= ~NFS_MOUNT_POSIX; 1094 break; 1095 case Opt_cto: 1096 mnt->flags &= ~NFS_MOUNT_NOCTO; 1097 break; 1098 case Opt_nocto: 1099 mnt->flags |= NFS_MOUNT_NOCTO; 1100 break; 1101 case Opt_ac: 1102 mnt->flags &= ~NFS_MOUNT_NOAC; 1103 break; 1104 case Opt_noac: 1105 mnt->flags |= NFS_MOUNT_NOAC; 1106 break; 1107 case Opt_lock: 1108 mnt->flags &= ~NFS_MOUNT_NONLM; 1109 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1110 NFS_MOUNT_LOCAL_FCNTL); 1111 break; 1112 case Opt_nolock: 1113 mnt->flags |= NFS_MOUNT_NONLM; 1114 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1115 NFS_MOUNT_LOCAL_FCNTL); 1116 break; 1117 case Opt_v2: 1118 mnt->flags &= ~NFS_MOUNT_VER3; 1119 mnt->version = 2; 1120 break; 1121 case Opt_v3: 1122 mnt->flags |= NFS_MOUNT_VER3; 1123 mnt->version = 3; 1124 break; 1125 case Opt_v4: 1126 mnt->flags &= ~NFS_MOUNT_VER3; 1127 mnt->version = 4; 1128 break; 1129 case Opt_udp: 1130 mnt->flags &= ~NFS_MOUNT_TCP; 1131 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1132 break; 1133 case Opt_tcp: 1134 mnt->flags |= NFS_MOUNT_TCP; 1135 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1136 break; 1137 case Opt_rdma: 1138 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1139 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1140 xprt_load_transport(p); 1141 break; 1142 case Opt_acl: 1143 mnt->flags &= ~NFS_MOUNT_NOACL; 1144 break; 1145 case Opt_noacl: 1146 mnt->flags |= NFS_MOUNT_NOACL; 1147 break; 1148 case Opt_rdirplus: 1149 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1150 break; 1151 case Opt_nordirplus: 1152 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1153 break; 1154 case Opt_sharecache: 1155 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1156 break; 1157 case Opt_nosharecache: 1158 mnt->flags |= NFS_MOUNT_UNSHARED; 1159 break; 1160 case Opt_resvport: 1161 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1162 break; 1163 case Opt_noresvport: 1164 mnt->flags |= NFS_MOUNT_NORESVPORT; 1165 break; 1166 case Opt_fscache: 1167 mnt->options |= NFS_OPTION_FSCACHE; 1168 kfree(mnt->fscache_uniq); 1169 mnt->fscache_uniq = NULL; 1170 break; 1171 case Opt_nofscache: 1172 mnt->options &= ~NFS_OPTION_FSCACHE; 1173 kfree(mnt->fscache_uniq); 1174 mnt->fscache_uniq = NULL; 1175 break; 1176 1177 /* 1178 * options that take numeric values 1179 */ 1180 case Opt_port: 1181 if (nfs_get_option_ul(args, &option) || 1182 option > USHRT_MAX) 1183 goto out_invalid_value; 1184 mnt->nfs_server.port = option; 1185 break; 1186 case Opt_rsize: 1187 if (nfs_get_option_ul(args, &option)) 1188 goto out_invalid_value; 1189 mnt->rsize = option; 1190 break; 1191 case Opt_wsize: 1192 if (nfs_get_option_ul(args, &option)) 1193 goto out_invalid_value; 1194 mnt->wsize = option; 1195 break; 1196 case Opt_bsize: 1197 if (nfs_get_option_ul(args, &option)) 1198 goto out_invalid_value; 1199 mnt->bsize = option; 1200 break; 1201 case Opt_timeo: 1202 if (nfs_get_option_ul(args, &option) || option == 0) 1203 goto out_invalid_value; 1204 mnt->timeo = option; 1205 break; 1206 case Opt_retrans: 1207 if (nfs_get_option_ul(args, &option) || option == 0) 1208 goto out_invalid_value; 1209 mnt->retrans = option; 1210 break; 1211 case Opt_acregmin: 1212 if (nfs_get_option_ul(args, &option)) 1213 goto out_invalid_value; 1214 mnt->acregmin = option; 1215 break; 1216 case Opt_acregmax: 1217 if (nfs_get_option_ul(args, &option)) 1218 goto out_invalid_value; 1219 mnt->acregmax = option; 1220 break; 1221 case Opt_acdirmin: 1222 if (nfs_get_option_ul(args, &option)) 1223 goto out_invalid_value; 1224 mnt->acdirmin = option; 1225 break; 1226 case Opt_acdirmax: 1227 if (nfs_get_option_ul(args, &option)) 1228 goto out_invalid_value; 1229 mnt->acdirmax = option; 1230 break; 1231 case Opt_actimeo: 1232 if (nfs_get_option_ul(args, &option)) 1233 goto out_invalid_value; 1234 mnt->acregmin = mnt->acregmax = 1235 mnt->acdirmin = mnt->acdirmax = option; 1236 break; 1237 case Opt_namelen: 1238 if (nfs_get_option_ul(args, &option)) 1239 goto out_invalid_value; 1240 mnt->namlen = option; 1241 break; 1242 case Opt_mountport: 1243 if (nfs_get_option_ul(args, &option) || 1244 option > USHRT_MAX) 1245 goto out_invalid_value; 1246 mnt->mount_server.port = option; 1247 break; 1248 case Opt_mountvers: 1249 if (nfs_get_option_ul(args, &option) || 1250 option < NFS_MNT_VERSION || 1251 option > NFS_MNT3_VERSION) 1252 goto out_invalid_value; 1253 mnt->mount_server.version = option; 1254 break; 1255 case Opt_nfsvers: 1256 if (nfs_get_option_ul(args, &option)) 1257 goto out_invalid_value; 1258 switch (option) { 1259 case NFS2_VERSION: 1260 mnt->flags &= ~NFS_MOUNT_VER3; 1261 mnt->version = 2; 1262 break; 1263 case NFS3_VERSION: 1264 mnt->flags |= NFS_MOUNT_VER3; 1265 mnt->version = 3; 1266 break; 1267 case NFS4_VERSION: 1268 mnt->flags &= ~NFS_MOUNT_VER3; 1269 mnt->version = 4; 1270 break; 1271 default: 1272 goto out_invalid_value; 1273 } 1274 break; 1275 case Opt_minorversion: 1276 if (nfs_get_option_ul(args, &option)) 1277 goto out_invalid_value; 1278 if (option > NFS4_MAX_MINOR_VERSION) 1279 goto out_invalid_value; 1280 mnt->minorversion = option; 1281 break; 1282 1283 /* 1284 * options that take text values 1285 */ 1286 case Opt_sec: 1287 string = match_strdup(args); 1288 if (string == NULL) 1289 goto out_nomem; 1290 rc = nfs_parse_security_flavors(string, mnt); 1291 kfree(string); 1292 if (!rc) { 1293 dfprintk(MOUNT, "NFS: unrecognized " 1294 "security flavor\n"); 1295 return 0; 1296 } 1297 break; 1298 case Opt_proto: 1299 string = match_strdup(args); 1300 if (string == NULL) 1301 goto out_nomem; 1302 token = match_token(string, 1303 nfs_xprt_protocol_tokens, args); 1304 1305 protofamily = AF_INET; 1306 switch (token) { 1307 case Opt_xprt_udp6: 1308 protofamily = AF_INET6; 1309 case Opt_xprt_udp: 1310 mnt->flags &= ~NFS_MOUNT_TCP; 1311 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1312 break; 1313 case Opt_xprt_tcp6: 1314 protofamily = AF_INET6; 1315 case Opt_xprt_tcp: 1316 mnt->flags |= NFS_MOUNT_TCP; 1317 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1318 break; 1319 case Opt_xprt_rdma: 1320 /* vector side protocols to TCP */ 1321 mnt->flags |= NFS_MOUNT_TCP; 1322 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1323 xprt_load_transport(string); 1324 break; 1325 default: 1326 dfprintk(MOUNT, "NFS: unrecognized " 1327 "transport protocol\n"); 1328 kfree(string); 1329 return 0; 1330 } 1331 kfree(string); 1332 break; 1333 case Opt_mountproto: 1334 string = match_strdup(args); 1335 if (string == NULL) 1336 goto out_nomem; 1337 token = match_token(string, 1338 nfs_xprt_protocol_tokens, args); 1339 kfree(string); 1340 1341 mountfamily = AF_INET; 1342 switch (token) { 1343 case Opt_xprt_udp6: 1344 mountfamily = AF_INET6; 1345 case Opt_xprt_udp: 1346 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1347 break; 1348 case Opt_xprt_tcp6: 1349 mountfamily = AF_INET6; 1350 case Opt_xprt_tcp: 1351 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1352 break; 1353 case Opt_xprt_rdma: /* not used for side protocols */ 1354 default: 1355 dfprintk(MOUNT, "NFS: unrecognized " 1356 "transport protocol\n"); 1357 return 0; 1358 } 1359 break; 1360 case Opt_addr: 1361 string = match_strdup(args); 1362 if (string == NULL) 1363 goto out_nomem; 1364 mnt->nfs_server.addrlen = 1365 rpc_pton(string, strlen(string), 1366 (struct sockaddr *) 1367 &mnt->nfs_server.address, 1368 sizeof(mnt->nfs_server.address)); 1369 kfree(string); 1370 if (mnt->nfs_server.addrlen == 0) 1371 goto out_invalid_address; 1372 break; 1373 case Opt_clientaddr: 1374 if (nfs_get_option_str(args, &mnt->client_address)) 1375 goto out_nomem; 1376 break; 1377 case Opt_mounthost: 1378 if (nfs_get_option_str(args, 1379 &mnt->mount_server.hostname)) 1380 goto out_nomem; 1381 break; 1382 case Opt_mountaddr: 1383 string = match_strdup(args); 1384 if (string == NULL) 1385 goto out_nomem; 1386 mnt->mount_server.addrlen = 1387 rpc_pton(string, strlen(string), 1388 (struct sockaddr *) 1389 &mnt->mount_server.address, 1390 sizeof(mnt->mount_server.address)); 1391 kfree(string); 1392 if (mnt->mount_server.addrlen == 0) 1393 goto out_invalid_address; 1394 break; 1395 case Opt_lookupcache: 1396 string = match_strdup(args); 1397 if (string == NULL) 1398 goto out_nomem; 1399 token = match_token(string, 1400 nfs_lookupcache_tokens, args); 1401 kfree(string); 1402 switch (token) { 1403 case Opt_lookupcache_all: 1404 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1405 break; 1406 case Opt_lookupcache_positive: 1407 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1408 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1409 break; 1410 case Opt_lookupcache_none: 1411 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1412 break; 1413 default: 1414 dfprintk(MOUNT, "NFS: invalid " 1415 "lookupcache argument\n"); 1416 return 0; 1417 }; 1418 break; 1419 case Opt_fscache_uniq: 1420 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1421 goto out_nomem; 1422 mnt->options |= NFS_OPTION_FSCACHE; 1423 break; 1424 case Opt_local_lock: 1425 string = match_strdup(args); 1426 if (string == NULL) 1427 goto out_nomem; 1428 token = match_token(string, nfs_local_lock_tokens, 1429 args); 1430 kfree(string); 1431 switch (token) { 1432 case Opt_local_lock_all: 1433 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1434 NFS_MOUNT_LOCAL_FCNTL); 1435 break; 1436 case Opt_local_lock_flock: 1437 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1438 break; 1439 case Opt_local_lock_posix: 1440 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1441 break; 1442 case Opt_local_lock_none: 1443 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1444 NFS_MOUNT_LOCAL_FCNTL); 1445 break; 1446 default: 1447 dfprintk(MOUNT, "NFS: invalid " 1448 "local_lock argument\n"); 1449 return 0; 1450 }; 1451 break; 1452 1453 /* 1454 * Special options 1455 */ 1456 case Opt_sloppy: 1457 sloppy = 1; 1458 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1459 break; 1460 case Opt_userspace: 1461 case Opt_deprecated: 1462 dfprintk(MOUNT, "NFS: ignoring mount option " 1463 "'%s'\n", p); 1464 break; 1465 1466 default: 1467 invalid_option = 1; 1468 dfprintk(MOUNT, "NFS: unrecognized mount option " 1469 "'%s'\n", p); 1470 } 1471 } 1472 1473 if (!sloppy && invalid_option) 1474 return 0; 1475 1476 /* 1477 * verify that any proto=/mountproto= options match the address 1478 * familiies in the addr=/mountaddr= options. 1479 */ 1480 if (protofamily != AF_UNSPEC && 1481 protofamily != mnt->nfs_server.address.ss_family) 1482 goto out_proto_mismatch; 1483 1484 if (mountfamily != AF_UNSPEC) { 1485 if (mnt->mount_server.addrlen) { 1486 if (mountfamily != mnt->mount_server.address.ss_family) 1487 goto out_mountproto_mismatch; 1488 } else { 1489 if (mountfamily != mnt->nfs_server.address.ss_family) 1490 goto out_mountproto_mismatch; 1491 } 1492 } 1493 1494 return 1; 1495 1496 out_mountproto_mismatch: 1497 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1498 "option\n"); 1499 return 0; 1500 out_proto_mismatch: 1501 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1502 return 0; 1503 out_invalid_address: 1504 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1505 return 0; 1506 out_invalid_value: 1507 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1508 return 0; 1509 out_nomem: 1510 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1511 return 0; 1512 out_security_failure: 1513 free_secdata(secdata); 1514 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1515 return 0; 1516 } 1517 1518 /* 1519 * Match the requested auth flavors with the list returned by 1520 * the server. Returns zero and sets the mount's authentication 1521 * flavor on success; returns -EACCES if server does not support 1522 * the requested flavor. 1523 */ 1524 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1525 struct nfs_mount_request *request) 1526 { 1527 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1528 1529 /* 1530 * Certain releases of Linux's mountd return an empty 1531 * flavor list. To prevent behavioral regression with 1532 * these servers (ie. rejecting mounts that used to 1533 * succeed), revert to pre-2.6.32 behavior (no checking) 1534 * if the returned flavor list is empty. 1535 */ 1536 if (server_authlist_len == 0) 1537 return 0; 1538 1539 /* 1540 * We avoid sophisticated negotiating here, as there are 1541 * plenty of cases where we can get it wrong, providing 1542 * either too little or too much security. 1543 * 1544 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1545 * flavor listed first. However, some servers list 1546 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1547 * preferred default, in args->auth_flavors[0] if user 1548 * didn't specify sec= mount option. 1549 */ 1550 for (i = 0; i < args->auth_flavor_len; i++) 1551 for (j = 0; j < server_authlist_len; j++) 1552 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1553 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1554 request->auth_flavs[j]); 1555 args->auth_flavors[0] = request->auth_flavs[j]; 1556 return 0; 1557 } 1558 1559 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1560 nfs_umount(request); 1561 return -EACCES; 1562 } 1563 1564 /* 1565 * Use the remote server's MOUNT service to request the NFS file handle 1566 * corresponding to the provided path. 1567 */ 1568 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1569 struct nfs_fh *root_fh) 1570 { 1571 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1572 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1573 struct nfs_mount_request request = { 1574 .sap = (struct sockaddr *) 1575 &args->mount_server.address, 1576 .dirpath = args->nfs_server.export_path, 1577 .protocol = args->mount_server.protocol, 1578 .fh = root_fh, 1579 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1580 .auth_flav_len = &server_authlist_len, 1581 .auth_flavs = server_authlist, 1582 }; 1583 int status; 1584 1585 if (args->mount_server.version == 0) { 1586 switch (args->version) { 1587 default: 1588 args->mount_server.version = NFS_MNT3_VERSION; 1589 break; 1590 case 2: 1591 args->mount_server.version = NFS_MNT_VERSION; 1592 } 1593 } 1594 request.version = args->mount_server.version; 1595 1596 if (args->mount_server.hostname) 1597 request.hostname = args->mount_server.hostname; 1598 else 1599 request.hostname = args->nfs_server.hostname; 1600 1601 /* 1602 * Construct the mount server's address. 1603 */ 1604 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1605 memcpy(request.sap, &args->nfs_server.address, 1606 args->nfs_server.addrlen); 1607 args->mount_server.addrlen = args->nfs_server.addrlen; 1608 } 1609 request.salen = args->mount_server.addrlen; 1610 nfs_set_port(request.sap, &args->mount_server.port, 0); 1611 1612 /* 1613 * Now ask the mount server to map our export path 1614 * to a file handle. 1615 */ 1616 status = nfs_mount(&request); 1617 if (status != 0) { 1618 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1619 request.hostname, status); 1620 return status; 1621 } 1622 1623 /* 1624 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1625 */ 1626 if (args->mount_server.version != NFS_MNT3_VERSION) 1627 return 0; 1628 return nfs_walk_authlist(args, &request); 1629 } 1630 1631 /* 1632 * Split "dev_name" into "hostname:export_path". 1633 * 1634 * The leftmost colon demarks the split between the server's hostname 1635 * and the export path. If the hostname starts with a left square 1636 * bracket, then it may contain colons. 1637 * 1638 * Note: caller frees hostname and export path, even on error. 1639 */ 1640 static int nfs_parse_devname(const char *dev_name, 1641 char **hostname, size_t maxnamlen, 1642 char **export_path, size_t maxpathlen) 1643 { 1644 size_t len; 1645 char *end; 1646 1647 /* Is the host name protected with square brakcets? */ 1648 if (*dev_name == '[') { 1649 end = strchr(++dev_name, ']'); 1650 if (end == NULL || end[1] != ':') 1651 goto out_bad_devname; 1652 1653 len = end - dev_name; 1654 end++; 1655 } else { 1656 char *comma; 1657 1658 end = strchr(dev_name, ':'); 1659 if (end == NULL) 1660 goto out_bad_devname; 1661 len = end - dev_name; 1662 1663 /* kill possible hostname list: not supported */ 1664 comma = strchr(dev_name, ','); 1665 if (comma != NULL && comma < end) 1666 *comma = 0; 1667 } 1668 1669 if (len > maxnamlen) 1670 goto out_hostname; 1671 1672 /* N.B. caller will free nfs_server.hostname in all cases */ 1673 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1674 if (*hostname == NULL) 1675 goto out_nomem; 1676 len = strlen(++end); 1677 if (len > maxpathlen) 1678 goto out_path; 1679 *export_path = kstrndup(end, len, GFP_KERNEL); 1680 if (!*export_path) 1681 goto out_nomem; 1682 1683 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1684 return 0; 1685 1686 out_bad_devname: 1687 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1688 return -EINVAL; 1689 1690 out_nomem: 1691 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1692 return -ENOMEM; 1693 1694 out_hostname: 1695 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1696 return -ENAMETOOLONG; 1697 1698 out_path: 1699 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1700 return -ENAMETOOLONG; 1701 } 1702 1703 /* 1704 * Validate the NFS2/NFS3 mount data 1705 * - fills in the mount root filehandle 1706 * 1707 * For option strings, user space handles the following behaviors: 1708 * 1709 * + DNS: mapping server host name to IP address ("addr=" option) 1710 * 1711 * + failure mode: how to behave if a mount request can't be handled 1712 * immediately ("fg/bg" option) 1713 * 1714 * + retry: how often to retry a mount request ("retry=" option) 1715 * 1716 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1717 * mountproto=tcp after mountproto=udp, and so on 1718 */ 1719 static int nfs_validate_mount_data(void *options, 1720 struct nfs_parsed_mount_data *args, 1721 struct nfs_fh *mntfh, 1722 const char *dev_name) 1723 { 1724 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1725 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1726 1727 if (data == NULL) 1728 goto out_no_data; 1729 1730 switch (data->version) { 1731 case 1: 1732 data->namlen = 0; 1733 case 2: 1734 data->bsize = 0; 1735 case 3: 1736 if (data->flags & NFS_MOUNT_VER3) 1737 goto out_no_v3; 1738 data->root.size = NFS2_FHSIZE; 1739 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1740 case 4: 1741 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1742 goto out_no_sec; 1743 case 5: 1744 memset(data->context, 0, sizeof(data->context)); 1745 case 6: 1746 if (data->flags & NFS_MOUNT_VER3) { 1747 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1748 goto out_invalid_fh; 1749 mntfh->size = data->root.size; 1750 args->version = 3; 1751 } else { 1752 mntfh->size = NFS2_FHSIZE; 1753 args->version = 2; 1754 } 1755 1756 1757 memcpy(mntfh->data, data->root.data, mntfh->size); 1758 if (mntfh->size < sizeof(mntfh->data)) 1759 memset(mntfh->data + mntfh->size, 0, 1760 sizeof(mntfh->data) - mntfh->size); 1761 1762 /* 1763 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1764 * can deal with. 1765 */ 1766 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1767 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1768 args->rsize = data->rsize; 1769 args->wsize = data->wsize; 1770 args->timeo = data->timeo; 1771 args->retrans = data->retrans; 1772 args->acregmin = data->acregmin; 1773 args->acregmax = data->acregmax; 1774 args->acdirmin = data->acdirmin; 1775 args->acdirmax = data->acdirmax; 1776 1777 memcpy(sap, &data->addr, sizeof(data->addr)); 1778 args->nfs_server.addrlen = sizeof(data->addr); 1779 if (!nfs_verify_server_address(sap)) 1780 goto out_no_address; 1781 1782 if (!(data->flags & NFS_MOUNT_TCP)) 1783 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1784 /* N.B. caller will free nfs_server.hostname in all cases */ 1785 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1786 args->namlen = data->namlen; 1787 args->bsize = data->bsize; 1788 1789 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1790 args->auth_flavors[0] = data->pseudoflavor; 1791 if (!args->nfs_server.hostname) 1792 goto out_nomem; 1793 1794 if (!(data->flags & NFS_MOUNT_NONLM)) 1795 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1796 NFS_MOUNT_LOCAL_FCNTL); 1797 else 1798 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1799 NFS_MOUNT_LOCAL_FCNTL); 1800 /* 1801 * The legacy version 6 binary mount data from userspace has a 1802 * field used only to transport selinux information into the 1803 * the kernel. To continue to support that functionality we 1804 * have a touch of selinux knowledge here in the NFS code. The 1805 * userspace code converted context=blah to just blah so we are 1806 * converting back to the full string selinux understands. 1807 */ 1808 if (data->context[0]){ 1809 #ifdef CONFIG_SECURITY_SELINUX 1810 int rc; 1811 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1812 if (!opts_str) 1813 return -ENOMEM; 1814 strcpy(opts_str, "context="); 1815 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1816 strcat(opts_str, &data->context[0]); 1817 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1818 kfree(opts_str); 1819 if (rc) 1820 return rc; 1821 #else 1822 return -EINVAL; 1823 #endif 1824 } 1825 1826 break; 1827 default: { 1828 int status; 1829 1830 if (nfs_parse_mount_options((char *)options, args) == 0) 1831 return -EINVAL; 1832 1833 if (!nfs_verify_server_address(sap)) 1834 goto out_no_address; 1835 1836 if (args->version == 4) 1837 #ifdef CONFIG_NFS_V4 1838 return nfs4_validate_text_mount_data(options, 1839 args, dev_name); 1840 #else 1841 goto out_v4_not_compiled; 1842 #endif 1843 1844 nfs_set_port(sap, &args->nfs_server.port, 0); 1845 1846 nfs_set_mount_transport_protocol(args); 1847 1848 status = nfs_parse_devname(dev_name, 1849 &args->nfs_server.hostname, 1850 PAGE_SIZE, 1851 &args->nfs_server.export_path, 1852 NFS_MAXPATHLEN); 1853 if (!status) 1854 status = nfs_try_mount(args, mntfh); 1855 1856 kfree(args->nfs_server.export_path); 1857 args->nfs_server.export_path = NULL; 1858 1859 if (status) 1860 return status; 1861 1862 break; 1863 } 1864 } 1865 1866 #ifndef CONFIG_NFS_V3 1867 if (args->version == 3) 1868 goto out_v3_not_compiled; 1869 #endif /* !CONFIG_NFS_V3 */ 1870 1871 return 0; 1872 1873 out_no_data: 1874 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1875 return -EINVAL; 1876 1877 out_no_v3: 1878 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1879 data->version); 1880 return -EINVAL; 1881 1882 out_no_sec: 1883 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1884 return -EINVAL; 1885 1886 #ifndef CONFIG_NFS_V3 1887 out_v3_not_compiled: 1888 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1889 return -EPROTONOSUPPORT; 1890 #endif /* !CONFIG_NFS_V3 */ 1891 1892 #ifndef CONFIG_NFS_V4 1893 out_v4_not_compiled: 1894 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 1895 return -EPROTONOSUPPORT; 1896 #endif /* !CONFIG_NFS_V4 */ 1897 1898 out_nomem: 1899 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1900 return -ENOMEM; 1901 1902 out_no_address: 1903 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1904 return -EINVAL; 1905 1906 out_invalid_fh: 1907 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1908 return -EINVAL; 1909 } 1910 1911 static int 1912 nfs_compare_remount_data(struct nfs_server *nfss, 1913 struct nfs_parsed_mount_data *data) 1914 { 1915 if (data->flags != nfss->flags || 1916 data->rsize != nfss->rsize || 1917 data->wsize != nfss->wsize || 1918 data->retrans != nfss->client->cl_timeout->to_retries || 1919 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 1920 data->acregmin != nfss->acregmin / HZ || 1921 data->acregmax != nfss->acregmax / HZ || 1922 data->acdirmin != nfss->acdirmin / HZ || 1923 data->acdirmax != nfss->acdirmax / HZ || 1924 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1925 data->nfs_server.port != nfss->port || 1926 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1927 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 1928 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1929 return -EINVAL; 1930 1931 return 0; 1932 } 1933 1934 static int 1935 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 1936 { 1937 int error; 1938 struct nfs_server *nfss = sb->s_fs_info; 1939 struct nfs_parsed_mount_data *data; 1940 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 1941 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 1942 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 1943 1944 /* 1945 * Userspace mount programs that send binary options generally send 1946 * them populated with default values. We have no way to know which 1947 * ones were explicitly specified. Fall back to legacy behavior and 1948 * just return success. 1949 */ 1950 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 1951 (nfsvers <= 3 && (!options || (options->version >= 1 && 1952 options->version <= 6)))) 1953 return 0; 1954 1955 data = kzalloc(sizeof(*data), GFP_KERNEL); 1956 if (data == NULL) 1957 return -ENOMEM; 1958 1959 /* fill out struct with values from existing mount */ 1960 data->flags = nfss->flags; 1961 data->rsize = nfss->rsize; 1962 data->wsize = nfss->wsize; 1963 data->retrans = nfss->client->cl_timeout->to_retries; 1964 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 1965 data->acregmin = nfss->acregmin / HZ; 1966 data->acregmax = nfss->acregmax / HZ; 1967 data->acdirmin = nfss->acdirmin / HZ; 1968 data->acdirmax = nfss->acdirmax / HZ; 1969 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1970 data->nfs_server.port = nfss->port; 1971 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1972 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 1973 data->nfs_server.addrlen); 1974 1975 /* overwrite those values with any that were specified */ 1976 error = nfs_parse_mount_options((char *)options, data); 1977 if (error < 0) 1978 goto out; 1979 1980 /* 1981 * noac is a special case. It implies -o sync, but that's not 1982 * necessarily reflected in the mtab options. do_remount_sb 1983 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 1984 * remount options, so we have to explicitly reset it. 1985 */ 1986 if (data->flags & NFS_MOUNT_NOAC) 1987 *flags |= MS_SYNCHRONOUS; 1988 1989 /* compare new mount options with old ones */ 1990 error = nfs_compare_remount_data(nfss, data); 1991 out: 1992 kfree(data); 1993 return error; 1994 } 1995 1996 /* 1997 * Initialise the common bits of the superblock 1998 */ 1999 static inline void nfs_initialise_sb(struct super_block *sb) 2000 { 2001 struct nfs_server *server = NFS_SB(sb); 2002 2003 sb->s_magic = NFS_SUPER_MAGIC; 2004 2005 /* We probably want something more informative here */ 2006 snprintf(sb->s_id, sizeof(sb->s_id), 2007 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2008 2009 if (sb->s_blocksize == 0) 2010 sb->s_blocksize = nfs_block_bits(server->wsize, 2011 &sb->s_blocksize_bits); 2012 2013 if (server->flags & NFS_MOUNT_NOAC) 2014 sb->s_flags |= MS_SYNCHRONOUS; 2015 2016 sb->s_bdi = &server->backing_dev_info; 2017 2018 nfs_super_set_maxbytes(sb, server->maxfilesize); 2019 } 2020 2021 /* 2022 * Finish setting up an NFS2/3 superblock 2023 */ 2024 static void nfs_fill_super(struct super_block *sb, 2025 struct nfs_parsed_mount_data *data) 2026 { 2027 struct nfs_server *server = NFS_SB(sb); 2028 2029 sb->s_blocksize_bits = 0; 2030 sb->s_blocksize = 0; 2031 if (data->bsize) 2032 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2033 2034 if (server->nfs_client->rpc_ops->version == 3) { 2035 /* The VFS shouldn't apply the umask to mode bits. We will do 2036 * so ourselves when necessary. 2037 */ 2038 sb->s_flags |= MS_POSIXACL; 2039 sb->s_time_gran = 1; 2040 } 2041 2042 sb->s_op = &nfs_sops; 2043 nfs_initialise_sb(sb); 2044 } 2045 2046 /* 2047 * Finish setting up a cloned NFS2/3 superblock 2048 */ 2049 static void nfs_clone_super(struct super_block *sb, 2050 const struct super_block *old_sb) 2051 { 2052 struct nfs_server *server = NFS_SB(sb); 2053 2054 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2055 sb->s_blocksize = old_sb->s_blocksize; 2056 sb->s_maxbytes = old_sb->s_maxbytes; 2057 2058 if (server->nfs_client->rpc_ops->version == 3) { 2059 /* The VFS shouldn't apply the umask to mode bits. We will do 2060 * so ourselves when necessary. 2061 */ 2062 sb->s_flags |= MS_POSIXACL; 2063 sb->s_time_gran = 1; 2064 } 2065 2066 sb->s_op = old_sb->s_op; 2067 nfs_initialise_sb(sb); 2068 } 2069 2070 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2071 { 2072 const struct nfs_server *a = s->s_fs_info; 2073 const struct rpc_clnt *clnt_a = a->client; 2074 const struct rpc_clnt *clnt_b = b->client; 2075 2076 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2077 goto Ebusy; 2078 if (a->nfs_client != b->nfs_client) 2079 goto Ebusy; 2080 if (a->flags != b->flags) 2081 goto Ebusy; 2082 if (a->wsize != b->wsize) 2083 goto Ebusy; 2084 if (a->rsize != b->rsize) 2085 goto Ebusy; 2086 if (a->acregmin != b->acregmin) 2087 goto Ebusy; 2088 if (a->acregmax != b->acregmax) 2089 goto Ebusy; 2090 if (a->acdirmin != b->acdirmin) 2091 goto Ebusy; 2092 if (a->acdirmax != b->acdirmax) 2093 goto Ebusy; 2094 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2095 goto Ebusy; 2096 return 1; 2097 Ebusy: 2098 return 0; 2099 } 2100 2101 struct nfs_sb_mountdata { 2102 struct nfs_server *server; 2103 int mntflags; 2104 }; 2105 2106 static int nfs_set_super(struct super_block *s, void *data) 2107 { 2108 struct nfs_sb_mountdata *sb_mntdata = data; 2109 struct nfs_server *server = sb_mntdata->server; 2110 int ret; 2111 2112 s->s_flags = sb_mntdata->mntflags; 2113 s->s_fs_info = server; 2114 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2115 ret = set_anon_super(s, server); 2116 if (ret == 0) 2117 server->s_dev = s->s_dev; 2118 return ret; 2119 } 2120 2121 static int nfs_compare_super_address(struct nfs_server *server1, 2122 struct nfs_server *server2) 2123 { 2124 struct sockaddr *sap1, *sap2; 2125 2126 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2127 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2128 2129 if (sap1->sa_family != sap2->sa_family) 2130 return 0; 2131 2132 switch (sap1->sa_family) { 2133 case AF_INET: { 2134 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2135 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2136 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2137 return 0; 2138 if (sin1->sin_port != sin2->sin_port) 2139 return 0; 2140 break; 2141 } 2142 case AF_INET6: { 2143 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2144 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2145 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2146 return 0; 2147 if (sin1->sin6_port != sin2->sin6_port) 2148 return 0; 2149 break; 2150 } 2151 default: 2152 return 0; 2153 } 2154 2155 return 1; 2156 } 2157 2158 static int nfs_compare_super(struct super_block *sb, void *data) 2159 { 2160 struct nfs_sb_mountdata *sb_mntdata = data; 2161 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2162 int mntflags = sb_mntdata->mntflags; 2163 2164 if (!nfs_compare_super_address(old, server)) 2165 return 0; 2166 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2167 if (old->flags & NFS_MOUNT_UNSHARED) 2168 return 0; 2169 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2170 return 0; 2171 return nfs_compare_mount_options(sb, server, mntflags); 2172 } 2173 2174 static int nfs_bdi_register(struct nfs_server *server) 2175 { 2176 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2177 } 2178 2179 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2180 int flags, const char *dev_name, void *raw_data) 2181 { 2182 struct nfs_server *server = NULL; 2183 struct super_block *s; 2184 struct nfs_parsed_mount_data *data; 2185 struct nfs_fh *mntfh; 2186 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2187 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2188 struct nfs_sb_mountdata sb_mntdata = { 2189 .mntflags = flags, 2190 }; 2191 int error; 2192 2193 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION); 2194 mntfh = nfs_alloc_fhandle(); 2195 if (data == NULL || mntfh == NULL) 2196 goto out_free_fh; 2197 2198 security_init_mnt_opts(&data->lsm_opts); 2199 2200 /* Validate the mount data */ 2201 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name); 2202 if (error < 0) { 2203 mntroot = ERR_PTR(error); 2204 goto out; 2205 } 2206 2207 #ifdef CONFIG_NFS_V4 2208 if (data->version == 4) { 2209 mntroot = nfs4_try_mount(flags, dev_name, data); 2210 kfree(data->client_address); 2211 kfree(data->nfs_server.export_path); 2212 goto out; 2213 } 2214 #endif /* CONFIG_NFS_V4 */ 2215 2216 /* Get a volume representation */ 2217 server = nfs_create_server(data, mntfh); 2218 if (IS_ERR(server)) { 2219 mntroot = ERR_CAST(server); 2220 goto out; 2221 } 2222 sb_mntdata.server = server; 2223 2224 if (server->flags & NFS_MOUNT_UNSHARED) 2225 compare_super = NULL; 2226 2227 /* Get a superblock - note that we may end up sharing one that already exists */ 2228 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 2229 if (IS_ERR(s)) { 2230 mntroot = ERR_CAST(s); 2231 goto out_err_nosb; 2232 } 2233 2234 if (s->s_fs_info != server) { 2235 nfs_free_server(server); 2236 server = NULL; 2237 } else { 2238 error = nfs_bdi_register(server); 2239 if (error) { 2240 mntroot = ERR_PTR(error); 2241 goto error_splat_bdi; 2242 } 2243 } 2244 2245 if (!s->s_root) { 2246 /* initial superblock/root creation */ 2247 nfs_fill_super(s, data); 2248 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL); 2249 } 2250 2251 mntroot = nfs_get_root(s, mntfh, dev_name); 2252 if (IS_ERR(mntroot)) 2253 goto error_splat_super; 2254 2255 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2256 if (error) 2257 goto error_splat_root; 2258 2259 s->s_flags |= MS_ACTIVE; 2260 2261 out: 2262 kfree(data->nfs_server.hostname); 2263 kfree(data->mount_server.hostname); 2264 kfree(data->fscache_uniq); 2265 security_free_mnt_opts(&data->lsm_opts); 2266 out_free_fh: 2267 nfs_free_fhandle(mntfh); 2268 kfree(data); 2269 return mntroot; 2270 2271 out_err_nosb: 2272 nfs_free_server(server); 2273 goto out; 2274 2275 error_splat_root: 2276 dput(mntroot); 2277 mntroot = ERR_PTR(error); 2278 error_splat_super: 2279 if (server && !s->s_root) 2280 bdi_unregister(&server->backing_dev_info); 2281 error_splat_bdi: 2282 deactivate_locked_super(s); 2283 goto out; 2284 } 2285 2286 /* 2287 * Ensure that we unregister the bdi before kill_anon_super 2288 * releases the device name 2289 */ 2290 static void nfs_put_super(struct super_block *s) 2291 { 2292 struct nfs_server *server = NFS_SB(s); 2293 2294 bdi_unregister(&server->backing_dev_info); 2295 } 2296 2297 /* 2298 * Destroy an NFS2/3 superblock 2299 */ 2300 static void nfs_kill_super(struct super_block *s) 2301 { 2302 struct nfs_server *server = NFS_SB(s); 2303 2304 kill_anon_super(s); 2305 nfs_fscache_release_super_cookie(s); 2306 nfs_free_server(server); 2307 } 2308 2309 /* 2310 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 2311 */ 2312 static struct dentry * 2313 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2314 const char *dev_name, void *raw_data) 2315 { 2316 struct nfs_clone_mount *data = raw_data; 2317 struct super_block *s; 2318 struct nfs_server *server; 2319 struct dentry *mntroot; 2320 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2321 struct nfs_sb_mountdata sb_mntdata = { 2322 .mntflags = flags, 2323 }; 2324 int error; 2325 2326 dprintk("--> nfs_xdev_mount()\n"); 2327 2328 /* create a new volume representation */ 2329 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2330 if (IS_ERR(server)) { 2331 error = PTR_ERR(server); 2332 goto out_err_noserver; 2333 } 2334 sb_mntdata.server = server; 2335 2336 if (server->flags & NFS_MOUNT_UNSHARED) 2337 compare_super = NULL; 2338 2339 /* Get a superblock - note that we may end up sharing one that already exists */ 2340 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2341 if (IS_ERR(s)) { 2342 error = PTR_ERR(s); 2343 goto out_err_nosb; 2344 } 2345 2346 if (s->s_fs_info != server) { 2347 nfs_free_server(server); 2348 server = NULL; 2349 } else { 2350 error = nfs_bdi_register(server); 2351 if (error) 2352 goto error_splat_bdi; 2353 } 2354 2355 if (!s->s_root) { 2356 /* initial superblock/root creation */ 2357 nfs_clone_super(s, data->sb); 2358 nfs_fscache_get_super_cookie(s, NULL, data); 2359 } 2360 2361 mntroot = nfs_get_root(s, data->fh, dev_name); 2362 if (IS_ERR(mntroot)) { 2363 error = PTR_ERR(mntroot); 2364 goto error_splat_super; 2365 } 2366 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2367 dput(mntroot); 2368 error = -ESTALE; 2369 goto error_splat_super; 2370 } 2371 2372 s->s_flags |= MS_ACTIVE; 2373 2374 /* clone any lsm security options from the parent to the new sb */ 2375 security_sb_clone_mnt_opts(data->sb, s); 2376 2377 dprintk("<-- nfs_xdev_mount() = 0\n"); 2378 return mntroot; 2379 2380 out_err_nosb: 2381 nfs_free_server(server); 2382 out_err_noserver: 2383 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error); 2384 return ERR_PTR(error); 2385 2386 error_splat_super: 2387 if (server && !s->s_root) 2388 bdi_unregister(&server->backing_dev_info); 2389 error_splat_bdi: 2390 deactivate_locked_super(s); 2391 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error); 2392 return ERR_PTR(error); 2393 } 2394 2395 #ifdef CONFIG_NFS_V4 2396 2397 /* 2398 * Finish setting up a cloned NFS4 superblock 2399 */ 2400 static void nfs4_clone_super(struct super_block *sb, 2401 const struct super_block *old_sb) 2402 { 2403 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2404 sb->s_blocksize = old_sb->s_blocksize; 2405 sb->s_maxbytes = old_sb->s_maxbytes; 2406 sb->s_time_gran = 1; 2407 sb->s_op = old_sb->s_op; 2408 /* 2409 * The VFS shouldn't apply the umask to mode bits. We will do 2410 * so ourselves when necessary. 2411 */ 2412 sb->s_flags |= MS_POSIXACL; 2413 sb->s_xattr = old_sb->s_xattr; 2414 nfs_initialise_sb(sb); 2415 } 2416 2417 /* 2418 * Set up an NFS4 superblock 2419 */ 2420 static void nfs4_fill_super(struct super_block *sb) 2421 { 2422 sb->s_time_gran = 1; 2423 sb->s_op = &nfs4_sops; 2424 /* 2425 * The VFS shouldn't apply the umask to mode bits. We will do 2426 * so ourselves when necessary. 2427 */ 2428 sb->s_flags |= MS_POSIXACL; 2429 sb->s_xattr = nfs4_xattr_handlers; 2430 nfs_initialise_sb(sb); 2431 } 2432 2433 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2434 { 2435 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2436 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2437 } 2438 2439 static int nfs4_validate_text_mount_data(void *options, 2440 struct nfs_parsed_mount_data *args, 2441 const char *dev_name) 2442 { 2443 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2444 2445 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT); 2446 2447 nfs_validate_transport_protocol(args); 2448 2449 nfs4_validate_mount_flags(args); 2450 2451 if (args->version != 4) { 2452 dfprintk(MOUNT, 2453 "NFS4: Illegal mount version\n"); 2454 return -EINVAL; 2455 } 2456 2457 if (args->auth_flavor_len > 1) { 2458 dfprintk(MOUNT, 2459 "NFS4: Too many RPC auth flavours specified\n"); 2460 return -EINVAL; 2461 } 2462 2463 if (args->client_address == NULL) { 2464 dfprintk(MOUNT, 2465 "NFS4: mount program didn't pass callback address\n"); 2466 return -EINVAL; 2467 } 2468 2469 return nfs_parse_devname(dev_name, 2470 &args->nfs_server.hostname, 2471 NFS4_MAXNAMLEN, 2472 &args->nfs_server.export_path, 2473 NFS4_MAXPATHLEN); 2474 } 2475 2476 /* 2477 * Validate NFSv4 mount options 2478 */ 2479 static int nfs4_validate_mount_data(void *options, 2480 struct nfs_parsed_mount_data *args, 2481 const char *dev_name) 2482 { 2483 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2484 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2485 char *c; 2486 2487 if (data == NULL) 2488 goto out_no_data; 2489 2490 switch (data->version) { 2491 case 1: 2492 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2493 goto out_no_address; 2494 if (data->host_addrlen == 0) 2495 goto out_no_address; 2496 args->nfs_server.addrlen = data->host_addrlen; 2497 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2498 return -EFAULT; 2499 if (!nfs_verify_server_address(sap)) 2500 goto out_no_address; 2501 2502 if (data->auth_flavourlen) { 2503 if (data->auth_flavourlen > 1) 2504 goto out_inval_auth; 2505 if (copy_from_user(&args->auth_flavors[0], 2506 data->auth_flavours, 2507 sizeof(args->auth_flavors[0]))) 2508 return -EFAULT; 2509 } 2510 2511 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2512 if (IS_ERR(c)) 2513 return PTR_ERR(c); 2514 args->nfs_server.hostname = c; 2515 2516 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2517 if (IS_ERR(c)) 2518 return PTR_ERR(c); 2519 args->nfs_server.export_path = c; 2520 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2521 2522 c = strndup_user(data->client_addr.data, 16); 2523 if (IS_ERR(c)) 2524 return PTR_ERR(c); 2525 args->client_address = c; 2526 2527 /* 2528 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2529 * can deal with. 2530 */ 2531 2532 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2533 args->rsize = data->rsize; 2534 args->wsize = data->wsize; 2535 args->timeo = data->timeo; 2536 args->retrans = data->retrans; 2537 args->acregmin = data->acregmin; 2538 args->acregmax = data->acregmax; 2539 args->acdirmin = data->acdirmin; 2540 args->acdirmax = data->acdirmax; 2541 args->nfs_server.protocol = data->proto; 2542 nfs_validate_transport_protocol(args); 2543 2544 break; 2545 default: 2546 if (nfs_parse_mount_options((char *)options, args) == 0) 2547 return -EINVAL; 2548 2549 if (!nfs_verify_server_address(sap)) 2550 return -EINVAL; 2551 2552 return nfs4_validate_text_mount_data(options, args, dev_name); 2553 } 2554 2555 return 0; 2556 2557 out_no_data: 2558 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2559 return -EINVAL; 2560 2561 out_inval_auth: 2562 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2563 data->auth_flavourlen); 2564 return -EINVAL; 2565 2566 out_no_address: 2567 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2568 return -EINVAL; 2569 } 2570 2571 /* 2572 * Get the superblock for the NFS4 root partition 2573 */ 2574 static struct dentry * 2575 nfs4_remote_mount(struct file_system_type *fs_type, int flags, 2576 const char *dev_name, void *raw_data) 2577 { 2578 struct nfs_parsed_mount_data *data = raw_data; 2579 struct super_block *s; 2580 struct nfs_server *server; 2581 struct nfs_fh *mntfh; 2582 struct dentry *mntroot; 2583 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2584 struct nfs_sb_mountdata sb_mntdata = { 2585 .mntflags = flags, 2586 }; 2587 int error = -ENOMEM; 2588 2589 mntfh = nfs_alloc_fhandle(); 2590 if (data == NULL || mntfh == NULL) 2591 goto out_free_fh; 2592 2593 security_init_mnt_opts(&data->lsm_opts); 2594 2595 /* Get a volume representation */ 2596 server = nfs4_create_server(data, mntfh); 2597 if (IS_ERR(server)) { 2598 error = PTR_ERR(server); 2599 goto out; 2600 } 2601 sb_mntdata.server = server; 2602 2603 if (server->flags & NFS4_MOUNT_UNSHARED) 2604 compare_super = NULL; 2605 2606 /* Get a superblock - note that we may end up sharing one that already exists */ 2607 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2608 if (IS_ERR(s)) { 2609 error = PTR_ERR(s); 2610 goto out_free; 2611 } 2612 2613 if (s->s_fs_info != server) { 2614 nfs_free_server(server); 2615 server = NULL; 2616 } else { 2617 error = nfs_bdi_register(server); 2618 if (error) 2619 goto error_splat_bdi; 2620 } 2621 2622 if (!s->s_root) { 2623 /* initial superblock/root creation */ 2624 nfs4_fill_super(s); 2625 nfs_fscache_get_super_cookie( 2626 s, data ? data->fscache_uniq : NULL, NULL); 2627 } 2628 2629 mntroot = nfs4_get_root(s, mntfh, dev_name); 2630 if (IS_ERR(mntroot)) { 2631 error = PTR_ERR(mntroot); 2632 goto error_splat_super; 2633 } 2634 2635 error = security_sb_set_mnt_opts(s, &data->lsm_opts); 2636 if (error) 2637 goto error_splat_root; 2638 2639 s->s_flags |= MS_ACTIVE; 2640 2641 security_free_mnt_opts(&data->lsm_opts); 2642 nfs_free_fhandle(mntfh); 2643 return mntroot; 2644 2645 out: 2646 security_free_mnt_opts(&data->lsm_opts); 2647 out_free_fh: 2648 nfs_free_fhandle(mntfh); 2649 return ERR_PTR(error); 2650 2651 out_free: 2652 nfs_free_server(server); 2653 goto out; 2654 2655 error_splat_root: 2656 dput(mntroot); 2657 error_splat_super: 2658 if (server && !s->s_root) 2659 bdi_unregister(&server->backing_dev_info); 2660 error_splat_bdi: 2661 deactivate_locked_super(s); 2662 goto out; 2663 } 2664 2665 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type, 2666 int flags, void *data, const char *hostname) 2667 { 2668 struct vfsmount *root_mnt; 2669 char *root_devname; 2670 size_t len; 2671 2672 len = strlen(hostname) + 3; 2673 root_devname = kmalloc(len, GFP_KERNEL); 2674 if (root_devname == NULL) 2675 return ERR_PTR(-ENOMEM); 2676 snprintf(root_devname, len, "%s:/", hostname); 2677 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data); 2678 kfree(root_devname); 2679 return root_mnt; 2680 } 2681 2682 struct nfs_referral_count { 2683 struct list_head list; 2684 const struct task_struct *task; 2685 unsigned int referral_count; 2686 }; 2687 2688 static LIST_HEAD(nfs_referral_count_list); 2689 static DEFINE_SPINLOCK(nfs_referral_count_list_lock); 2690 2691 static struct nfs_referral_count *nfs_find_referral_count(void) 2692 { 2693 struct nfs_referral_count *p; 2694 2695 list_for_each_entry(p, &nfs_referral_count_list, list) { 2696 if (p->task == current) 2697 return p; 2698 } 2699 return NULL; 2700 } 2701 2702 #define NFS_MAX_NESTED_REFERRALS 2 2703 2704 static int nfs_referral_loop_protect(void) 2705 { 2706 struct nfs_referral_count *p, *new; 2707 int ret = -ENOMEM; 2708 2709 new = kmalloc(sizeof(*new), GFP_KERNEL); 2710 if (!new) 2711 goto out; 2712 new->task = current; 2713 new->referral_count = 1; 2714 2715 ret = 0; 2716 spin_lock(&nfs_referral_count_list_lock); 2717 p = nfs_find_referral_count(); 2718 if (p != NULL) { 2719 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS) 2720 ret = -ELOOP; 2721 else 2722 p->referral_count++; 2723 } else { 2724 list_add(&new->list, &nfs_referral_count_list); 2725 new = NULL; 2726 } 2727 spin_unlock(&nfs_referral_count_list_lock); 2728 kfree(new); 2729 out: 2730 return ret; 2731 } 2732 2733 static void nfs_referral_loop_unprotect(void) 2734 { 2735 struct nfs_referral_count *p; 2736 2737 spin_lock(&nfs_referral_count_list_lock); 2738 p = nfs_find_referral_count(); 2739 p->referral_count--; 2740 if (p->referral_count == 0) 2741 list_del(&p->list); 2742 else 2743 p = NULL; 2744 spin_unlock(&nfs_referral_count_list_lock); 2745 kfree(p); 2746 } 2747 2748 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt, 2749 const char *export_path) 2750 { 2751 struct nameidata *nd = NULL; 2752 struct mnt_namespace *ns_private; 2753 struct super_block *s; 2754 struct dentry *dentry; 2755 int ret; 2756 2757 nd = kmalloc(sizeof(*nd), GFP_KERNEL); 2758 if (nd == NULL) 2759 return ERR_PTR(-ENOMEM); 2760 2761 ns_private = create_mnt_ns(root_mnt); 2762 ret = PTR_ERR(ns_private); 2763 if (IS_ERR(ns_private)) 2764 goto out_mntput; 2765 2766 ret = nfs_referral_loop_protect(); 2767 if (ret != 0) 2768 goto out_put_mnt_ns; 2769 2770 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 2771 export_path, LOOKUP_FOLLOW, nd); 2772 2773 nfs_referral_loop_unprotect(); 2774 put_mnt_ns(ns_private); 2775 2776 if (ret != 0) 2777 goto out_err; 2778 2779 s = nd->path.mnt->mnt_sb; 2780 atomic_inc(&s->s_active); 2781 dentry = dget(nd->path.dentry); 2782 2783 path_put(&nd->path); 2784 kfree(nd); 2785 down_write(&s->s_umount); 2786 return dentry; 2787 out_put_mnt_ns: 2788 put_mnt_ns(ns_private); 2789 out_mntput: 2790 mntput(root_mnt); 2791 out_err: 2792 kfree(nd); 2793 return ERR_PTR(ret); 2794 } 2795 2796 static struct dentry *nfs4_try_mount(int flags, const char *dev_name, 2797 struct nfs_parsed_mount_data *data) 2798 { 2799 char *export_path; 2800 struct vfsmount *root_mnt; 2801 struct dentry *res; 2802 2803 dfprintk(MOUNT, "--> nfs4_try_mount()\n"); 2804 2805 export_path = data->nfs_server.export_path; 2806 data->nfs_server.export_path = "/"; 2807 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data, 2808 data->nfs_server.hostname); 2809 data->nfs_server.export_path = export_path; 2810 2811 res = ERR_CAST(root_mnt); 2812 if (!IS_ERR(root_mnt)) 2813 res = nfs_follow_remote_path(root_mnt, export_path); 2814 2815 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n", 2816 IS_ERR(res) ? PTR_ERR(res) : 0, 2817 IS_ERR(res) ? " [error]" : ""); 2818 return res; 2819 } 2820 2821 /* 2822 * Get the superblock for an NFS4 mountpoint 2823 */ 2824 static struct dentry *nfs4_mount(struct file_system_type *fs_type, 2825 int flags, const char *dev_name, void *raw_data) 2826 { 2827 struct nfs_parsed_mount_data *data; 2828 int error = -ENOMEM; 2829 struct dentry *res = ERR_PTR(-ENOMEM); 2830 2831 data = nfs_alloc_parsed_mount_data(4); 2832 if (data == NULL) 2833 goto out_free_data; 2834 2835 /* Validate the mount data */ 2836 error = nfs4_validate_mount_data(raw_data, data, dev_name); 2837 if (error < 0) { 2838 res = ERR_PTR(error); 2839 goto out; 2840 } 2841 2842 res = nfs4_try_mount(flags, dev_name, data); 2843 if (IS_ERR(res)) 2844 error = PTR_ERR(res); 2845 2846 out: 2847 kfree(data->client_address); 2848 kfree(data->nfs_server.export_path); 2849 kfree(data->nfs_server.hostname); 2850 kfree(data->fscache_uniq); 2851 out_free_data: 2852 kfree(data); 2853 dprintk("<-- nfs4_mount() = %d%s\n", error, 2854 error != 0 ? " [error]" : ""); 2855 return res; 2856 } 2857 2858 static void nfs4_kill_super(struct super_block *sb) 2859 { 2860 struct nfs_server *server = NFS_SB(sb); 2861 2862 dprintk("--> %s\n", __func__); 2863 nfs_super_return_all_delegations(sb); 2864 kill_anon_super(sb); 2865 nfs_fscache_release_super_cookie(sb); 2866 nfs_free_server(server); 2867 dprintk("<-- %s\n", __func__); 2868 } 2869 2870 /* 2871 * Clone an NFS4 server record on xdev traversal (FSID-change) 2872 */ 2873 static struct dentry * 2874 nfs4_xdev_mount(struct file_system_type *fs_type, int flags, 2875 const char *dev_name, void *raw_data) 2876 { 2877 struct nfs_clone_mount *data = raw_data; 2878 struct super_block *s; 2879 struct nfs_server *server; 2880 struct dentry *mntroot; 2881 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2882 struct nfs_sb_mountdata sb_mntdata = { 2883 .mntflags = flags, 2884 }; 2885 int error; 2886 2887 dprintk("--> nfs4_xdev_mount()\n"); 2888 2889 /* create a new volume representation */ 2890 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 2891 if (IS_ERR(server)) { 2892 error = PTR_ERR(server); 2893 goto out_err_noserver; 2894 } 2895 sb_mntdata.server = server; 2896 2897 if (server->flags & NFS4_MOUNT_UNSHARED) 2898 compare_super = NULL; 2899 2900 /* Get a superblock - note that we may end up sharing one that already exists */ 2901 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2902 if (IS_ERR(s)) { 2903 error = PTR_ERR(s); 2904 goto out_err_nosb; 2905 } 2906 2907 if (s->s_fs_info != server) { 2908 nfs_free_server(server); 2909 server = NULL; 2910 } else { 2911 error = nfs_bdi_register(server); 2912 if (error) 2913 goto error_splat_bdi; 2914 } 2915 2916 if (!s->s_root) { 2917 /* initial superblock/root creation */ 2918 nfs4_clone_super(s, data->sb); 2919 nfs_fscache_get_super_cookie(s, NULL, data); 2920 } 2921 2922 mntroot = nfs4_get_root(s, data->fh, dev_name); 2923 if (IS_ERR(mntroot)) { 2924 error = PTR_ERR(mntroot); 2925 goto error_splat_super; 2926 } 2927 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2928 dput(mntroot); 2929 error = -ESTALE; 2930 goto error_splat_super; 2931 } 2932 2933 s->s_flags |= MS_ACTIVE; 2934 2935 security_sb_clone_mnt_opts(data->sb, s); 2936 2937 dprintk("<-- nfs4_xdev_mount() = 0\n"); 2938 return mntroot; 2939 2940 out_err_nosb: 2941 nfs_free_server(server); 2942 out_err_noserver: 2943 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error); 2944 return ERR_PTR(error); 2945 2946 error_splat_super: 2947 if (server && !s->s_root) 2948 bdi_unregister(&server->backing_dev_info); 2949 error_splat_bdi: 2950 deactivate_locked_super(s); 2951 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error); 2952 return ERR_PTR(error); 2953 } 2954 2955 static struct dentry * 2956 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags, 2957 const char *dev_name, void *raw_data) 2958 { 2959 struct nfs_clone_mount *data = raw_data; 2960 struct super_block *s; 2961 struct nfs_server *server; 2962 struct dentry *mntroot; 2963 struct nfs_fh *mntfh; 2964 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2965 struct nfs_sb_mountdata sb_mntdata = { 2966 .mntflags = flags, 2967 }; 2968 int error = -ENOMEM; 2969 2970 dprintk("--> nfs4_referral_get_sb()\n"); 2971 2972 mntfh = nfs_alloc_fhandle(); 2973 if (mntfh == NULL) 2974 goto out_err_nofh; 2975 2976 /* create a new volume representation */ 2977 server = nfs4_create_referral_server(data, mntfh); 2978 if (IS_ERR(server)) { 2979 error = PTR_ERR(server); 2980 goto out_err_noserver; 2981 } 2982 sb_mntdata.server = server; 2983 2984 if (server->flags & NFS4_MOUNT_UNSHARED) 2985 compare_super = NULL; 2986 2987 /* Get a superblock - note that we may end up sharing one that already exists */ 2988 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2989 if (IS_ERR(s)) { 2990 error = PTR_ERR(s); 2991 goto out_err_nosb; 2992 } 2993 2994 if (s->s_fs_info != server) { 2995 nfs_free_server(server); 2996 server = NULL; 2997 } else { 2998 error = nfs_bdi_register(server); 2999 if (error) 3000 goto error_splat_bdi; 3001 } 3002 3003 if (!s->s_root) { 3004 /* initial superblock/root creation */ 3005 nfs4_fill_super(s); 3006 nfs_fscache_get_super_cookie(s, NULL, data); 3007 } 3008 3009 mntroot = nfs4_get_root(s, mntfh, dev_name); 3010 if (IS_ERR(mntroot)) { 3011 error = PTR_ERR(mntroot); 3012 goto error_splat_super; 3013 } 3014 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 3015 dput(mntroot); 3016 error = -ESTALE; 3017 goto error_splat_super; 3018 } 3019 3020 s->s_flags |= MS_ACTIVE; 3021 3022 security_sb_clone_mnt_opts(data->sb, s); 3023 3024 nfs_free_fhandle(mntfh); 3025 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 3026 return mntroot; 3027 3028 out_err_nosb: 3029 nfs_free_server(server); 3030 out_err_noserver: 3031 nfs_free_fhandle(mntfh); 3032 out_err_nofh: 3033 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 3034 return ERR_PTR(error); 3035 3036 error_splat_super: 3037 if (server && !s->s_root) 3038 bdi_unregister(&server->backing_dev_info); 3039 error_splat_bdi: 3040 deactivate_locked_super(s); 3041 nfs_free_fhandle(mntfh); 3042 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 3043 return ERR_PTR(error); 3044 } 3045 3046 /* 3047 * Create an NFS4 server record on referral traversal 3048 */ 3049 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type, 3050 int flags, const char *dev_name, void *raw_data) 3051 { 3052 struct nfs_clone_mount *data = raw_data; 3053 char *export_path; 3054 struct vfsmount *root_mnt; 3055 struct dentry *res; 3056 3057 dprintk("--> nfs4_referral_mount()\n"); 3058 3059 export_path = data->mnt_path; 3060 data->mnt_path = "/"; 3061 3062 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type, 3063 flags, data, data->hostname); 3064 data->mnt_path = export_path; 3065 3066 res = ERR_CAST(root_mnt); 3067 if (!IS_ERR(root_mnt)) 3068 res = nfs_follow_remote_path(root_mnt, export_path); 3069 dprintk("<-- nfs4_referral_mount() = %ld%s\n", 3070 IS_ERR(res) ? PTR_ERR(res) : 0, 3071 IS_ERR(res) ? " [error]" : ""); 3072 return res; 3073 } 3074 3075 #endif /* CONFIG_NFS_V4 */ 3076