1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/nfs/super.c 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * 7 * nfs superblock handling functions 8 * 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 11 * 12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 13 * J.S.Peatfield@damtp.cam.ac.uk 14 * 15 * Split from inode.c by David Howells <dhowells@redhat.com> 16 * 17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 18 * particular server are held in the same superblock 19 * - NFS superblocks can have several effective roots to the dentry tree 20 * - directory type roots are spliced into the tree when a path from one root reaches the root 21 * of another (see nfs_lookup()) 22 */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 27 #include <linux/time.h> 28 #include <linux/kernel.h> 29 #include <linux/mm.h> 30 #include <linux/string.h> 31 #include <linux/stat.h> 32 #include <linux/errno.h> 33 #include <linux/unistd.h> 34 #include <linux/sunrpc/clnt.h> 35 #include <linux/sunrpc/addr.h> 36 #include <linux/sunrpc/stats.h> 37 #include <linux/sunrpc/metrics.h> 38 #include <linux/sunrpc/xprtsock.h> 39 #include <linux/sunrpc/xprtrdma.h> 40 #include <linux/nfs_fs.h> 41 #include <linux/nfs_mount.h> 42 #include <linux/nfs4_mount.h> 43 #include <linux/lockd/bind.h> 44 #include <linux/seq_file.h> 45 #include <linux/mount.h> 46 #include <linux/namei.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 #include <linux/nsproxy.h> 57 #include <linux/rcupdate.h> 58 59 #include <linux/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 #include "nfs4session.h" 68 #include "pnfs.h" 69 #include "nfs.h" 70 71 #define NFSDBG_FACILITY NFSDBG_VFS 72 73 const struct super_operations nfs_sops = { 74 .alloc_inode = nfs_alloc_inode, 75 .free_inode = nfs_free_inode, 76 .write_inode = nfs_write_inode, 77 .drop_inode = nfs_drop_inode, 78 .statfs = nfs_statfs, 79 .evict_inode = nfs_evict_inode, 80 .umount_begin = nfs_umount_begin, 81 .show_options = nfs_show_options, 82 .show_devname = nfs_show_devname, 83 .show_path = nfs_show_path, 84 .show_stats = nfs_show_stats, 85 }; 86 EXPORT_SYMBOL_GPL(nfs_sops); 87 88 #if IS_ENABLED(CONFIG_NFS_V4) 89 static int __init register_nfs4_fs(void) 90 { 91 return register_filesystem(&nfs4_fs_type); 92 } 93 94 static void unregister_nfs4_fs(void) 95 { 96 unregister_filesystem(&nfs4_fs_type); 97 } 98 #else 99 static int __init register_nfs4_fs(void) 100 { 101 return 0; 102 } 103 104 static void unregister_nfs4_fs(void) 105 { 106 } 107 #endif 108 109 static struct shrinker acl_shrinker = { 110 .count_objects = nfs_access_cache_count, 111 .scan_objects = nfs_access_cache_scan, 112 .seeks = DEFAULT_SEEKS, 113 }; 114 115 /* 116 * Register the NFS filesystems 117 */ 118 int __init register_nfs_fs(void) 119 { 120 int ret; 121 122 ret = register_filesystem(&nfs_fs_type); 123 if (ret < 0) 124 goto error_0; 125 126 ret = register_nfs4_fs(); 127 if (ret < 0) 128 goto error_1; 129 130 ret = nfs_register_sysctl(); 131 if (ret < 0) 132 goto error_2; 133 ret = register_shrinker(&acl_shrinker); 134 if (ret < 0) 135 goto error_3; 136 return 0; 137 error_3: 138 nfs_unregister_sysctl(); 139 error_2: 140 unregister_nfs4_fs(); 141 error_1: 142 unregister_filesystem(&nfs_fs_type); 143 error_0: 144 return ret; 145 } 146 147 /* 148 * Unregister the NFS filesystems 149 */ 150 void __exit unregister_nfs_fs(void) 151 { 152 unregister_shrinker(&acl_shrinker); 153 nfs_unregister_sysctl(); 154 unregister_nfs4_fs(); 155 unregister_filesystem(&nfs_fs_type); 156 } 157 158 bool nfs_sb_active(struct super_block *sb) 159 { 160 struct nfs_server *server = NFS_SB(sb); 161 162 if (!atomic_inc_not_zero(&sb->s_active)) 163 return false; 164 if (atomic_inc_return(&server->active) != 1) 165 atomic_dec(&sb->s_active); 166 return true; 167 } 168 EXPORT_SYMBOL_GPL(nfs_sb_active); 169 170 void nfs_sb_deactive(struct super_block *sb) 171 { 172 struct nfs_server *server = NFS_SB(sb); 173 174 if (atomic_dec_and_test(&server->active)) 175 deactivate_super(sb); 176 } 177 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 178 179 static int __nfs_list_for_each_server(struct list_head *head, 180 int (*fn)(struct nfs_server *, void *), 181 void *data) 182 { 183 struct nfs_server *server, *last = NULL; 184 int ret = 0; 185 186 rcu_read_lock(); 187 list_for_each_entry_rcu(server, head, client_link) { 188 if (!(server->super && nfs_sb_active(server->super))) 189 continue; 190 rcu_read_unlock(); 191 if (last) 192 nfs_sb_deactive(last->super); 193 last = server; 194 ret = fn(server, data); 195 if (ret) 196 goto out; 197 rcu_read_lock(); 198 } 199 rcu_read_unlock(); 200 out: 201 if (last) 202 nfs_sb_deactive(last->super); 203 return ret; 204 } 205 206 int nfs_client_for_each_server(struct nfs_client *clp, 207 int (*fn)(struct nfs_server *, void *), 208 void *data) 209 { 210 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); 211 } 212 EXPORT_SYMBOL_GPL(nfs_client_for_each_server); 213 214 /* 215 * Deliver file system statistics to userspace 216 */ 217 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 218 { 219 struct nfs_server *server = NFS_SB(dentry->d_sb); 220 unsigned char blockbits; 221 unsigned long blockres; 222 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 223 struct nfs_fsstat res; 224 int error = -ENOMEM; 225 226 res.fattr = nfs_alloc_fattr(); 227 if (res.fattr == NULL) 228 goto out_err; 229 230 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 231 if (unlikely(error == -ESTALE)) { 232 struct dentry *pd_dentry; 233 234 pd_dentry = dget_parent(dentry); 235 nfs_zap_caches(d_inode(pd_dentry)); 236 dput(pd_dentry); 237 } 238 nfs_free_fattr(res.fattr); 239 if (error < 0) 240 goto out_err; 241 242 buf->f_type = NFS_SUPER_MAGIC; 243 244 /* 245 * Current versions of glibc do not correctly handle the 246 * case where f_frsize != f_bsize. Eventually we want to 247 * report the value of wtmult in this field. 248 */ 249 buf->f_frsize = dentry->d_sb->s_blocksize; 250 251 /* 252 * On most *nix systems, f_blocks, f_bfree, and f_bavail 253 * are reported in units of f_frsize. Linux hasn't had 254 * an f_frsize field in its statfs struct until recently, 255 * thus historically Linux's sys_statfs reports these 256 * fields in units of f_bsize. 257 */ 258 buf->f_bsize = dentry->d_sb->s_blocksize; 259 blockbits = dentry->d_sb->s_blocksize_bits; 260 blockres = (1 << blockbits) - 1; 261 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 262 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 263 buf->f_bavail = (res.abytes + blockres) >> blockbits; 264 265 buf->f_files = res.tfiles; 266 buf->f_ffree = res.afiles; 267 268 buf->f_namelen = server->namelen; 269 270 return 0; 271 272 out_err: 273 dprintk("%s: statfs error = %d\n", __func__, -error); 274 return error; 275 } 276 EXPORT_SYMBOL_GPL(nfs_statfs); 277 278 /* 279 * Map the security flavour number to a name 280 */ 281 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 282 { 283 static const struct { 284 rpc_authflavor_t flavour; 285 const char *str; 286 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 287 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 288 { RPC_AUTH_NULL, "null" }, 289 { RPC_AUTH_UNIX, "sys" }, 290 { RPC_AUTH_GSS_KRB5, "krb5" }, 291 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 292 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 293 { RPC_AUTH_GSS_LKEY, "lkey" }, 294 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 295 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 296 { RPC_AUTH_GSS_SPKM, "spkm" }, 297 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 298 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 299 { UINT_MAX, "unknown" } 300 }; 301 int i; 302 303 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 304 if (sec_flavours[i].flavour == flavour) 305 break; 306 } 307 return sec_flavours[i].str; 308 } 309 310 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 311 int showdefaults) 312 { 313 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 314 char *proto = NULL; 315 316 switch (sap->sa_family) { 317 case AF_INET: 318 switch (nfss->mountd_protocol) { 319 case IPPROTO_UDP: 320 proto = RPCBIND_NETID_UDP; 321 break; 322 case IPPROTO_TCP: 323 proto = RPCBIND_NETID_TCP; 324 break; 325 } 326 break; 327 case AF_INET6: 328 switch (nfss->mountd_protocol) { 329 case IPPROTO_UDP: 330 proto = RPCBIND_NETID_UDP6; 331 break; 332 case IPPROTO_TCP: 333 proto = RPCBIND_NETID_TCP6; 334 break; 335 } 336 break; 337 } 338 if (proto || showdefaults) 339 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 340 } 341 342 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 343 int showdefaults) 344 { 345 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 346 347 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 348 return; 349 350 switch (sap->sa_family) { 351 case AF_INET: { 352 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 353 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 354 break; 355 } 356 case AF_INET6: { 357 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 358 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 359 break; 360 } 361 default: 362 if (showdefaults) 363 seq_puts(m, ",mountaddr=unspecified"); 364 } 365 366 if (nfss->mountd_version || showdefaults) 367 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 368 if ((nfss->mountd_port && 369 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 370 showdefaults) 371 seq_printf(m, ",mountport=%u", nfss->mountd_port); 372 373 nfs_show_mountd_netid(m, nfss, showdefaults); 374 } 375 376 #if IS_ENABLED(CONFIG_NFS_V4) 377 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 378 int showdefaults) 379 { 380 struct nfs_client *clp = nfss->nfs_client; 381 382 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 383 } 384 #else 385 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 386 int showdefaults) 387 { 388 } 389 #endif 390 391 static void nfs_show_nfs_version(struct seq_file *m, 392 unsigned int version, 393 unsigned int minorversion) 394 { 395 seq_printf(m, ",vers=%u", version); 396 if (version == 4) 397 seq_printf(m, ".%u", minorversion); 398 } 399 400 /* 401 * Describe the mount options in force on this server representation 402 */ 403 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 404 int showdefaults) 405 { 406 static const struct proc_nfs_info { 407 int flag; 408 const char *str; 409 const char *nostr; 410 } nfs_info[] = { 411 { NFS_MOUNT_SOFT, ",soft", "" }, 412 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 413 { NFS_MOUNT_SOFTREVAL, ",softreval", "" }, 414 { NFS_MOUNT_POSIX, ",posix", "" }, 415 { NFS_MOUNT_NOCTO, ",nocto", "" }, 416 { NFS_MOUNT_NOAC, ",noac", "" }, 417 { NFS_MOUNT_NONLM, ",nolock", "" }, 418 { NFS_MOUNT_NOACL, ",noacl", "" }, 419 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 420 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 421 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 422 { 0, NULL, NULL } 423 }; 424 const struct proc_nfs_info *nfs_infop; 425 struct nfs_client *clp = nfss->nfs_client; 426 u32 version = clp->rpc_ops->version; 427 int local_flock, local_fcntl; 428 429 nfs_show_nfs_version(m, version, clp->cl_minorversion); 430 seq_printf(m, ",rsize=%u", nfss->rsize); 431 seq_printf(m, ",wsize=%u", nfss->wsize); 432 if (nfss->bsize != 0) 433 seq_printf(m, ",bsize=%u", nfss->bsize); 434 seq_printf(m, ",namlen=%u", nfss->namelen); 435 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 436 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 437 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 438 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 439 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 440 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 441 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 442 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 443 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 444 seq_puts(m, ",hard"); 445 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 446 if (nfss->flags & nfs_infop->flag) 447 seq_puts(m, nfs_infop->str); 448 else 449 seq_puts(m, nfs_infop->nostr); 450 } 451 rcu_read_lock(); 452 seq_printf(m, ",proto=%s", 453 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 454 rcu_read_unlock(); 455 if (clp->cl_nconnect > 0) 456 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 457 if (version == 4) { 458 if (nfss->port != NFS_PORT) 459 seq_printf(m, ",port=%u", nfss->port); 460 } else 461 if (nfss->port) 462 seq_printf(m, ",port=%u", nfss->port); 463 464 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 465 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 466 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 467 468 if (version != 4) 469 nfs_show_mountd_options(m, nfss, showdefaults); 470 else 471 nfs_show_nfsv4_options(m, nfss, showdefaults); 472 473 if (nfss->options & NFS_OPTION_FSCACHE) 474 seq_puts(m, ",fsc"); 475 476 if (nfss->options & NFS_OPTION_MIGRATION) 477 seq_puts(m, ",migration"); 478 479 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 480 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 481 seq_puts(m, ",lookupcache=none"); 482 else 483 seq_puts(m, ",lookupcache=pos"); 484 } 485 486 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 487 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 488 489 if (!local_flock && !local_fcntl) 490 seq_puts(m, ",local_lock=none"); 491 else if (local_flock && local_fcntl) 492 seq_puts(m, ",local_lock=all"); 493 else if (local_flock) 494 seq_puts(m, ",local_lock=flock"); 495 else 496 seq_puts(m, ",local_lock=posix"); 497 } 498 499 /* 500 * Describe the mount options on this VFS mountpoint 501 */ 502 int nfs_show_options(struct seq_file *m, struct dentry *root) 503 { 504 struct nfs_server *nfss = NFS_SB(root->d_sb); 505 506 nfs_show_mount_options(m, nfss, 0); 507 508 rcu_read_lock(); 509 seq_printf(m, ",addr=%s", 510 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 511 RPC_DISPLAY_ADDR)); 512 rcu_read_unlock(); 513 514 return 0; 515 } 516 EXPORT_SYMBOL_GPL(nfs_show_options); 517 518 #if IS_ENABLED(CONFIG_NFS_V4) 519 static void show_lease(struct seq_file *m, struct nfs_server *server) 520 { 521 struct nfs_client *clp = server->nfs_client; 522 unsigned long expire; 523 524 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 525 expire = clp->cl_last_renewal + clp->cl_lease_time; 526 seq_printf(m, ",lease_expired=%ld", 527 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 528 } 529 #ifdef CONFIG_NFS_V4_1 530 static void show_sessions(struct seq_file *m, struct nfs_server *server) 531 { 532 if (nfs4_has_session(server->nfs_client)) 533 seq_puts(m, ",sessions"); 534 } 535 #else 536 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 537 #endif 538 #endif 539 540 #ifdef CONFIG_NFS_V4_1 541 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 542 { 543 seq_printf(m, ",pnfs="); 544 if (server->pnfs_curr_ld) 545 seq_printf(m, "%s", server->pnfs_curr_ld->name); 546 else 547 seq_printf(m, "not configured"); 548 } 549 550 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 551 { 552 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 553 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 554 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 555 "date='%llu,%u'", 556 impl_id->name, impl_id->domain, 557 impl_id->date.seconds, impl_id->date.nseconds); 558 } 559 } 560 #else 561 #if IS_ENABLED(CONFIG_NFS_V4) 562 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 563 { 564 } 565 #endif 566 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 567 { 568 } 569 #endif 570 571 int nfs_show_devname(struct seq_file *m, struct dentry *root) 572 { 573 char *page = (char *) __get_free_page(GFP_KERNEL); 574 char *devname, *dummy; 575 int err = 0; 576 if (!page) 577 return -ENOMEM; 578 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 579 if (IS_ERR(devname)) 580 err = PTR_ERR(devname); 581 else 582 seq_escape(m, devname, " \t\n\\"); 583 free_page((unsigned long)page); 584 return err; 585 } 586 EXPORT_SYMBOL_GPL(nfs_show_devname); 587 588 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 589 { 590 seq_puts(m, "/"); 591 return 0; 592 } 593 EXPORT_SYMBOL_GPL(nfs_show_path); 594 595 /* 596 * Present statistical information for this VFS mountpoint 597 */ 598 int nfs_show_stats(struct seq_file *m, struct dentry *root) 599 { 600 int i, cpu; 601 struct nfs_server *nfss = NFS_SB(root->d_sb); 602 struct rpc_auth *auth = nfss->client->cl_auth; 603 struct nfs_iostats totals = { }; 604 605 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 606 607 /* 608 * Display all mount option settings 609 */ 610 seq_puts(m, "\n\topts:\t"); 611 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 612 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 613 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 614 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 615 nfs_show_mount_options(m, nfss, 1); 616 617 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 618 619 show_implementation_id(m, nfss); 620 621 seq_puts(m, "\n\tcaps:\t"); 622 seq_printf(m, "caps=0x%x", nfss->caps); 623 seq_printf(m, ",wtmult=%u", nfss->wtmult); 624 seq_printf(m, ",dtsize=%u", nfss->dtsize); 625 seq_printf(m, ",bsize=%u", nfss->bsize); 626 seq_printf(m, ",namlen=%u", nfss->namelen); 627 628 #if IS_ENABLED(CONFIG_NFS_V4) 629 if (nfss->nfs_client->rpc_ops->version == 4) { 630 seq_puts(m, "\n\tnfsv4:\t"); 631 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 632 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 633 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 634 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 635 show_sessions(m, nfss); 636 show_pnfs(m, nfss); 637 show_lease(m, nfss); 638 } 639 #endif 640 641 /* 642 * Display security flavor in effect for this mount 643 */ 644 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 645 if (auth->au_flavor) 646 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 647 648 /* 649 * Display superblock I/O counters 650 */ 651 for_each_possible_cpu(cpu) { 652 struct nfs_iostats *stats; 653 654 preempt_disable(); 655 stats = per_cpu_ptr(nfss->io_stats, cpu); 656 657 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 658 totals.events[i] += stats->events[i]; 659 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 660 totals.bytes[i] += stats->bytes[i]; 661 #ifdef CONFIG_NFS_FSCACHE 662 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 663 totals.fscache[i] += stats->fscache[i]; 664 #endif 665 666 preempt_enable(); 667 } 668 669 seq_puts(m, "\n\tevents:\t"); 670 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 671 seq_printf(m, "%lu ", totals.events[i]); 672 seq_puts(m, "\n\tbytes:\t"); 673 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 674 seq_printf(m, "%Lu ", totals.bytes[i]); 675 #ifdef CONFIG_NFS_FSCACHE 676 if (nfss->options & NFS_OPTION_FSCACHE) { 677 seq_puts(m, "\n\tfsc:\t"); 678 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 679 seq_printf(m, "%Lu ", totals.fscache[i]); 680 } 681 #endif 682 seq_putc(m, '\n'); 683 684 rpc_clnt_show_stats(m, nfss->client); 685 686 return 0; 687 } 688 EXPORT_SYMBOL_GPL(nfs_show_stats); 689 690 /* 691 * Begin unmount by attempting to remove all automounted mountpoints we added 692 * in response to xdev traversals and referrals 693 */ 694 void nfs_umount_begin(struct super_block *sb) 695 { 696 struct nfs_server *server; 697 struct rpc_clnt *rpc; 698 699 server = NFS_SB(sb); 700 /* -EIO all pending I/O */ 701 rpc = server->client_acl; 702 if (!IS_ERR(rpc)) 703 rpc_killall_tasks(rpc); 704 rpc = server->client; 705 if (!IS_ERR(rpc)) 706 rpc_killall_tasks(rpc); 707 } 708 EXPORT_SYMBOL_GPL(nfs_umount_begin); 709 710 /* 711 * Return true if 'match' is in auth_info or auth_info is empty. 712 * Return false otherwise. 713 */ 714 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 715 rpc_authflavor_t match) 716 { 717 int i; 718 719 if (!auth_info->flavor_len) 720 return true; 721 722 for (i = 0; i < auth_info->flavor_len; i++) { 723 if (auth_info->flavors[i] == match) 724 return true; 725 } 726 return false; 727 } 728 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 729 730 /* 731 * Ensure that a specified authtype in ctx->auth_info is supported by 732 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and 733 * -EACCES if not. 734 */ 735 static int nfs_verify_authflavors(struct nfs_fs_context *ctx, 736 rpc_authflavor_t *server_authlist, 737 unsigned int count) 738 { 739 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 740 bool found_auth_null = false; 741 unsigned int i; 742 743 /* 744 * If the sec= mount option is used, the specified flavor or AUTH_NULL 745 * must be in the list returned by the server. 746 * 747 * AUTH_NULL has a special meaning when it's in the server list - it 748 * means that the server will ignore the rpc creds, so any flavor 749 * can be used but still use the sec= that was specified. 750 * 751 * Note also that the MNT procedure in MNTv1 does not return a list 752 * of supported security flavors. In this case, nfs_mount() fabricates 753 * a security flavor list containing just AUTH_NULL. 754 */ 755 for (i = 0; i < count; i++) { 756 flavor = server_authlist[i]; 757 758 if (nfs_auth_info_match(&ctx->auth_info, flavor)) 759 goto out; 760 761 if (flavor == RPC_AUTH_NULL) 762 found_auth_null = true; 763 } 764 765 if (found_auth_null) { 766 flavor = ctx->auth_info.flavors[0]; 767 goto out; 768 } 769 770 dfprintk(MOUNT, 771 "NFS: specified auth flavors not supported by server\n"); 772 return -EACCES; 773 774 out: 775 ctx->selected_flavor = flavor; 776 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); 777 return 0; 778 } 779 780 /* 781 * Use the remote server's MOUNT service to request the NFS file handle 782 * corresponding to the provided path. 783 */ 784 static int nfs_request_mount(struct fs_context *fc, 785 struct nfs_fh *root_fh, 786 rpc_authflavor_t *server_authlist, 787 unsigned int *server_authlist_len) 788 { 789 struct nfs_fs_context *ctx = nfs_fc2context(fc); 790 struct nfs_mount_request request = { 791 .sap = (struct sockaddr *) 792 &ctx->mount_server.address, 793 .dirpath = ctx->nfs_server.export_path, 794 .protocol = ctx->mount_server.protocol, 795 .fh = root_fh, 796 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, 797 .auth_flav_len = server_authlist_len, 798 .auth_flavs = server_authlist, 799 .net = fc->net_ns, 800 }; 801 int status; 802 803 if (ctx->mount_server.version == 0) { 804 switch (ctx->version) { 805 default: 806 ctx->mount_server.version = NFS_MNT3_VERSION; 807 break; 808 case 2: 809 ctx->mount_server.version = NFS_MNT_VERSION; 810 } 811 } 812 request.version = ctx->mount_server.version; 813 814 if (ctx->mount_server.hostname) 815 request.hostname = ctx->mount_server.hostname; 816 else 817 request.hostname = ctx->nfs_server.hostname; 818 819 /* 820 * Construct the mount server's address. 821 */ 822 if (ctx->mount_server.address.sa_family == AF_UNSPEC) { 823 memcpy(request.sap, &ctx->nfs_server.address, 824 ctx->nfs_server.addrlen); 825 ctx->mount_server.addrlen = ctx->nfs_server.addrlen; 826 } 827 request.salen = ctx->mount_server.addrlen; 828 nfs_set_port(request.sap, &ctx->mount_server.port, 0); 829 830 /* 831 * Now ask the mount server to map our export path 832 * to a file handle. 833 */ 834 status = nfs_mount(&request); 835 if (status != 0) { 836 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 837 request.hostname, status); 838 return status; 839 } 840 841 return 0; 842 } 843 844 static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) 845 { 846 struct nfs_fs_context *ctx = nfs_fc2context(fc); 847 int status; 848 unsigned int i; 849 bool tried_auth_unix = false; 850 bool auth_null_in_list = false; 851 struct nfs_server *server = ERR_PTR(-EACCES); 852 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 853 unsigned int authlist_len = ARRAY_SIZE(authlist); 854 855 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); 856 if (status) 857 return ERR_PTR(status); 858 859 /* 860 * Was a sec= authflavor specified in the options? First, verify 861 * whether the server supports it, and then just try to use it if so. 862 */ 863 if (ctx->auth_info.flavor_len > 0) { 864 status = nfs_verify_authflavors(ctx, authlist, authlist_len); 865 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 866 ctx->selected_flavor); 867 if (status) 868 return ERR_PTR(status); 869 return ctx->nfs_mod->rpc_ops->create_server(fc); 870 } 871 872 /* 873 * No sec= option was provided. RFC 2623, section 2.7 suggests we 874 * SHOULD prefer the flavor listed first. However, some servers list 875 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 876 */ 877 for (i = 0; i < authlist_len; ++i) { 878 rpc_authflavor_t flavor; 879 struct rpcsec_gss_info info; 880 881 flavor = authlist[i]; 882 switch (flavor) { 883 case RPC_AUTH_UNIX: 884 tried_auth_unix = true; 885 break; 886 case RPC_AUTH_NULL: 887 auth_null_in_list = true; 888 continue; 889 default: 890 if (rpcauth_get_gssinfo(flavor, &info) != 0) 891 continue; 892 /* Fallthrough */ 893 } 894 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 895 ctx->selected_flavor = flavor; 896 server = ctx->nfs_mod->rpc_ops->create_server(fc); 897 if (!IS_ERR(server)) 898 return server; 899 } 900 901 /* 902 * Nothing we tried so far worked. At this point, give up if we've 903 * already tried AUTH_UNIX or if the server's list doesn't contain 904 * AUTH_NULL 905 */ 906 if (tried_auth_unix || !auth_null_in_list) 907 return server; 908 909 /* Last chance! Try AUTH_UNIX */ 910 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 911 ctx->selected_flavor = RPC_AUTH_UNIX; 912 return ctx->nfs_mod->rpc_ops->create_server(fc); 913 } 914 915 int nfs_try_get_tree(struct fs_context *fc) 916 { 917 struct nfs_fs_context *ctx = nfs_fc2context(fc); 918 919 if (ctx->need_mount) 920 ctx->server = nfs_try_mount_request(fc); 921 else 922 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); 923 924 return nfs_get_tree_common(fc); 925 } 926 EXPORT_SYMBOL_GPL(nfs_try_get_tree); 927 928 929 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 930 | NFS_MOUNT_SECURE \ 931 | NFS_MOUNT_TCP \ 932 | NFS_MOUNT_VER3 \ 933 | NFS_MOUNT_KERBEROS \ 934 | NFS_MOUNT_NONLM \ 935 | NFS_MOUNT_BROKEN_SUID \ 936 | NFS_MOUNT_STRICTLOCK \ 937 | NFS_MOUNT_LEGACY_INTERFACE) 938 939 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 940 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 941 942 static int 943 nfs_compare_remount_data(struct nfs_server *nfss, 944 struct nfs_fs_context *ctx) 945 { 946 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 947 ctx->rsize != nfss->rsize || 948 ctx->wsize != nfss->wsize || 949 ctx->version != nfss->nfs_client->rpc_ops->version || 950 ctx->minorversion != nfss->nfs_client->cl_minorversion || 951 ctx->retrans != nfss->client->cl_timeout->to_retries || 952 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || 953 ctx->acregmin != nfss->acregmin / HZ || 954 ctx->acregmax != nfss->acregmax / HZ || 955 ctx->acdirmin != nfss->acdirmin / HZ || 956 ctx->acdirmax != nfss->acdirmax / HZ || 957 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 958 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || 959 ctx->nfs_server.port != nfss->port || 960 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 961 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, 962 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 963 return -EINVAL; 964 965 return 0; 966 } 967 968 int nfs_reconfigure(struct fs_context *fc) 969 { 970 struct nfs_fs_context *ctx = nfs_fc2context(fc); 971 struct super_block *sb = fc->root->d_sb; 972 struct nfs_server *nfss = sb->s_fs_info; 973 974 sync_filesystem(sb); 975 976 /* 977 * Userspace mount programs that send binary options generally send 978 * them populated with default values. We have no way to know which 979 * ones were explicitly specified. Fall back to legacy behavior and 980 * just return success. 981 */ 982 if (ctx->skip_reconfig_option_check) 983 return 0; 984 985 /* 986 * noac is a special case. It implies -o sync, but that's not 987 * necessarily reflected in the mtab options. reconfigure_super 988 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 989 * remount options, so we have to explicitly reset it. 990 */ 991 if (ctx->flags & NFS_MOUNT_NOAC) { 992 fc->sb_flags |= SB_SYNCHRONOUS; 993 fc->sb_flags_mask |= SB_SYNCHRONOUS; 994 } 995 996 /* compare new mount options with old ones */ 997 return nfs_compare_remount_data(nfss, ctx); 998 } 999 EXPORT_SYMBOL_GPL(nfs_reconfigure); 1000 1001 /* 1002 * Finish setting up an NFS superblock 1003 */ 1004 static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 1005 { 1006 struct nfs_server *server = NFS_SB(sb); 1007 1008 sb->s_blocksize_bits = 0; 1009 sb->s_blocksize = 0; 1010 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 1011 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 1012 if (ctx && ctx->bsize) 1013 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); 1014 1015 if (server->nfs_client->rpc_ops->version != 2) { 1016 /* The VFS shouldn't apply the umask to mode bits. We will do 1017 * so ourselves when necessary. 1018 */ 1019 sb->s_flags |= SB_POSIXACL; 1020 sb->s_time_gran = 1; 1021 sb->s_export_op = &nfs_export_ops; 1022 } else 1023 sb->s_time_gran = 1000; 1024 1025 if (server->nfs_client->rpc_ops->version != 4) { 1026 sb->s_time_min = 0; 1027 sb->s_time_max = U32_MAX; 1028 } else { 1029 sb->s_time_min = S64_MIN; 1030 sb->s_time_max = S64_MAX; 1031 } 1032 1033 sb->s_magic = NFS_SUPER_MAGIC; 1034 1035 /* We probably want something more informative here */ 1036 snprintf(sb->s_id, sizeof(sb->s_id), 1037 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1038 1039 if (sb->s_blocksize == 0) 1040 sb->s_blocksize = nfs_block_bits(server->wsize, 1041 &sb->s_blocksize_bits); 1042 1043 nfs_super_set_maxbytes(sb, server->maxfilesize); 1044 } 1045 1046 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, 1047 const struct fs_context *fc) 1048 { 1049 const struct nfs_server *a = s->s_fs_info; 1050 const struct rpc_clnt *clnt_a = a->client; 1051 const struct rpc_clnt *clnt_b = b->client; 1052 1053 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) 1054 goto Ebusy; 1055 if (a->nfs_client != b->nfs_client) 1056 goto Ebusy; 1057 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 1058 goto Ebusy; 1059 if (a->wsize != b->wsize) 1060 goto Ebusy; 1061 if (a->rsize != b->rsize) 1062 goto Ebusy; 1063 if (a->acregmin != b->acregmin) 1064 goto Ebusy; 1065 if (a->acregmax != b->acregmax) 1066 goto Ebusy; 1067 if (a->acdirmin != b->acdirmin) 1068 goto Ebusy; 1069 if (a->acdirmax != b->acdirmax) 1070 goto Ebusy; 1071 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1072 goto Ebusy; 1073 return 1; 1074 Ebusy: 1075 return 0; 1076 } 1077 1078 static int nfs_set_super(struct super_block *s, struct fs_context *fc) 1079 { 1080 struct nfs_server *server = fc->s_fs_info; 1081 int ret; 1082 1083 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 1084 ret = set_anon_super(s, server); 1085 if (ret == 0) 1086 server->s_dev = s->s_dev; 1087 return ret; 1088 } 1089 1090 static int nfs_compare_super_address(struct nfs_server *server1, 1091 struct nfs_server *server2) 1092 { 1093 struct sockaddr *sap1, *sap2; 1094 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 1095 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 1096 1097 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 1098 return 0; 1099 1100 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1101 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1102 1103 if (sap1->sa_family != sap2->sa_family) 1104 return 0; 1105 1106 switch (sap1->sa_family) { 1107 case AF_INET: { 1108 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1109 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1110 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1111 return 0; 1112 if (sin1->sin_port != sin2->sin_port) 1113 return 0; 1114 break; 1115 } 1116 case AF_INET6: { 1117 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1118 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1119 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1120 return 0; 1121 if (sin1->sin6_port != sin2->sin6_port) 1122 return 0; 1123 break; 1124 } 1125 default: 1126 return 0; 1127 } 1128 1129 return 1; 1130 } 1131 1132 static int nfs_compare_userns(const struct nfs_server *old, 1133 const struct nfs_server *new) 1134 { 1135 const struct user_namespace *oldns = &init_user_ns; 1136 const struct user_namespace *newns = &init_user_ns; 1137 1138 if (old->client && old->client->cl_cred) 1139 oldns = old->client->cl_cred->user_ns; 1140 if (new->client && new->client->cl_cred) 1141 newns = new->client->cl_cred->user_ns; 1142 if (oldns != newns) 1143 return 0; 1144 return 1; 1145 } 1146 1147 static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) 1148 { 1149 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); 1150 1151 if (!nfs_compare_super_address(old, server)) 1152 return 0; 1153 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1154 if (old->flags & NFS_MOUNT_UNSHARED) 1155 return 0; 1156 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1157 return 0; 1158 if (!nfs_compare_userns(old, server)) 1159 return 0; 1160 return nfs_compare_mount_options(sb, server, fc); 1161 } 1162 1163 #ifdef CONFIG_NFS_FSCACHE 1164 static void nfs_get_cache_cookie(struct super_block *sb, 1165 struct nfs_fs_context *ctx) 1166 { 1167 struct nfs_server *nfss = NFS_SB(sb); 1168 char *uniq = NULL; 1169 int ulen = 0; 1170 1171 nfss->fscache_key = NULL; 1172 nfss->fscache = NULL; 1173 1174 if (!ctx) 1175 return; 1176 1177 if (ctx->clone_data.sb) { 1178 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); 1179 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 1180 return; 1181 if (mnt_s->fscache_key) { 1182 uniq = mnt_s->fscache_key->key.uniquifier; 1183 ulen = mnt_s->fscache_key->key.uniq_len; 1184 } 1185 } else { 1186 if (!(ctx->options & NFS_OPTION_FSCACHE)) 1187 return; 1188 if (ctx->fscache_uniq) { 1189 uniq = ctx->fscache_uniq; 1190 ulen = strlen(ctx->fscache_uniq); 1191 } 1192 } 1193 1194 nfs_fscache_get_super_cookie(sb, uniq, ulen); 1195 } 1196 #else 1197 static void nfs_get_cache_cookie(struct super_block *sb, 1198 struct nfs_fs_context *ctx) 1199 { 1200 } 1201 #endif 1202 1203 static void nfs_set_readahead(struct backing_dev_info *bdi, 1204 unsigned long iomax_pages) 1205 { 1206 bdi->ra_pages = VM_READAHEAD_PAGES; 1207 bdi->io_pages = iomax_pages; 1208 } 1209 1210 int nfs_get_tree_common(struct fs_context *fc) 1211 { 1212 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1213 struct super_block *s; 1214 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; 1215 struct nfs_server *server = ctx->server; 1216 int error; 1217 1218 ctx->server = NULL; 1219 if (IS_ERR(server)) 1220 return PTR_ERR(server); 1221 1222 if (server->flags & NFS_MOUNT_UNSHARED) 1223 compare_super = NULL; 1224 1225 /* -o noac implies -o sync */ 1226 if (server->flags & NFS_MOUNT_NOAC) 1227 fc->sb_flags |= SB_SYNCHRONOUS; 1228 1229 if (ctx->clone_data.sb) 1230 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) 1231 fc->sb_flags |= SB_SYNCHRONOUS; 1232 1233 if (server->caps & NFS_CAP_SECURITY_LABEL) 1234 fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS; 1235 1236 /* Get a superblock - note that we may end up sharing one that already exists */ 1237 fc->s_fs_info = server; 1238 s = sget_fc(fc, compare_super, nfs_set_super); 1239 fc->s_fs_info = NULL; 1240 if (IS_ERR(s)) { 1241 error = PTR_ERR(s); 1242 nfs_errorf(fc, "NFS: Couldn't get superblock"); 1243 goto out_err_nosb; 1244 } 1245 1246 if (s->s_fs_info != server) { 1247 nfs_free_server(server); 1248 server = NULL; 1249 } else { 1250 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 1251 MINOR(server->s_dev)); 1252 if (error) 1253 goto error_splat_super; 1254 nfs_set_readahead(s->s_bdi, server->rpages); 1255 server->super = s; 1256 } 1257 1258 if (!s->s_root) { 1259 unsigned bsize = ctx->clone_data.inherited_bsize; 1260 /* initial superblock/root creation */ 1261 nfs_fill_super(s, ctx); 1262 if (bsize) { 1263 s->s_blocksize_bits = bsize; 1264 s->s_blocksize = 1U << bsize; 1265 } 1266 nfs_get_cache_cookie(s, ctx); 1267 } 1268 1269 error = nfs_get_root(s, fc); 1270 if (error < 0) { 1271 nfs_errorf(fc, "NFS: Couldn't get root dentry"); 1272 goto error_splat_super; 1273 } 1274 1275 s->s_flags |= SB_ACTIVE; 1276 error = 0; 1277 1278 out: 1279 return error; 1280 1281 out_err_nosb: 1282 nfs_free_server(server); 1283 goto out; 1284 error_splat_super: 1285 deactivate_locked_super(s); 1286 goto out; 1287 } 1288 1289 /* 1290 * Destroy an NFS2/3 superblock 1291 */ 1292 void nfs_kill_super(struct super_block *s) 1293 { 1294 struct nfs_server *server = NFS_SB(s); 1295 dev_t dev = s->s_dev; 1296 1297 generic_shutdown_super(s); 1298 1299 nfs_fscache_release_super_cookie(s); 1300 1301 nfs_free_server(server); 1302 free_anon_bdev(dev); 1303 } 1304 EXPORT_SYMBOL_GPL(nfs_kill_super); 1305 1306 #if IS_ENABLED(CONFIG_NFS_V4) 1307 1308 /* 1309 * NFS v4 module parameters need to stay in the 1310 * NFS client for backwards compatibility 1311 */ 1312 unsigned int nfs_callback_set_tcpport; 1313 unsigned short nfs_callback_nr_threads; 1314 /* Default cache timeout is 10 minutes */ 1315 unsigned int nfs_idmap_cache_timeout = 600; 1316 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 1317 bool nfs4_disable_idmapping = true; 1318 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 1319 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 1320 unsigned short send_implementation_id = 1; 1321 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 1322 bool recover_lost_locks = false; 1323 1324 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 1325 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 1326 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 1327 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 1328 EXPORT_SYMBOL_GPL(max_session_slots); 1329 EXPORT_SYMBOL_GPL(max_session_cb_slots); 1330 EXPORT_SYMBOL_GPL(send_implementation_id); 1331 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 1332 EXPORT_SYMBOL_GPL(recover_lost_locks); 1333 1334 #define NFS_CALLBACK_MAXPORTNR (65535U) 1335 1336 static int param_set_portnr(const char *val, const struct kernel_param *kp) 1337 { 1338 unsigned long num; 1339 int ret; 1340 1341 if (!val) 1342 return -EINVAL; 1343 ret = kstrtoul(val, 0, &num); 1344 if (ret || num > NFS_CALLBACK_MAXPORTNR) 1345 return -EINVAL; 1346 *((unsigned int *)kp->arg) = num; 1347 return 0; 1348 } 1349 static const struct kernel_param_ops param_ops_portnr = { 1350 .set = param_set_portnr, 1351 .get = param_get_uint, 1352 }; 1353 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 1354 1355 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 1356 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 1357 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 1358 "assigned to the NFSv4 callback channels."); 1359 module_param(nfs_idmap_cache_timeout, int, 0644); 1360 module_param(nfs4_disable_idmapping, bool, 0644); 1361 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 1362 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 1363 MODULE_PARM_DESC(nfs4_disable_idmapping, 1364 "Turn off NFSv4 idmapping when using 'sec=sys'"); 1365 module_param(max_session_slots, ushort, 0644); 1366 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 1367 "requests the client will negotiate"); 1368 module_param(max_session_cb_slots, ushort, 0644); 1369 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 1370 "callbacks the client will process for a given server"); 1371 module_param(send_implementation_id, ushort, 0644); 1372 MODULE_PARM_DESC(send_implementation_id, 1373 "Send implementation ID with NFSv4.1 exchange_id"); 1374 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 1375 1376 module_param(recover_lost_locks, bool, 0644); 1377 MODULE_PARM_DESC(recover_lost_locks, 1378 "If the server reports that a lock might be lost, " 1379 "try to recover it risking data corruption."); 1380 1381 1382 #endif /* CONFIG_NFS_V4 */ 1383