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 #include <linux/nfs_ssc.h> 61 62 #include "nfs4_fs.h" 63 #include "callback.h" 64 #include "delegation.h" 65 #include "iostat.h" 66 #include "internal.h" 67 #include "fscache.h" 68 #include "nfs4session.h" 69 #include "pnfs.h" 70 #include "nfs.h" 71 72 #define NFSDBG_FACILITY NFSDBG_VFS 73 74 const struct super_operations nfs_sops = { 75 .alloc_inode = nfs_alloc_inode, 76 .free_inode = nfs_free_inode, 77 .write_inode = nfs_write_inode, 78 .drop_inode = nfs_drop_inode, 79 .statfs = nfs_statfs, 80 .evict_inode = nfs_evict_inode, 81 .umount_begin = nfs_umount_begin, 82 .show_options = nfs_show_options, 83 .show_devname = nfs_show_devname, 84 .show_path = nfs_show_path, 85 .show_stats = nfs_show_stats, 86 }; 87 EXPORT_SYMBOL_GPL(nfs_sops); 88 89 #ifdef CONFIG_NFS_V4_2 90 static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { 91 .sco_sb_deactive = nfs_sb_deactive, 92 }; 93 #endif 94 95 #if IS_ENABLED(CONFIG_NFS_V4) 96 static int __init register_nfs4_fs(void) 97 { 98 return register_filesystem(&nfs4_fs_type); 99 } 100 101 static void unregister_nfs4_fs(void) 102 { 103 unregister_filesystem(&nfs4_fs_type); 104 } 105 #else 106 static int __init register_nfs4_fs(void) 107 { 108 return 0; 109 } 110 111 static void unregister_nfs4_fs(void) 112 { 113 } 114 #endif 115 116 #ifdef CONFIG_NFS_V4_2 117 static void nfs_ssc_register_ops(void) 118 { 119 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); 120 } 121 122 static void nfs_ssc_unregister_ops(void) 123 { 124 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); 125 } 126 #endif /* CONFIG_NFS_V4_2 */ 127 128 static struct shrinker acl_shrinker = { 129 .count_objects = nfs_access_cache_count, 130 .scan_objects = nfs_access_cache_scan, 131 .seeks = DEFAULT_SEEKS, 132 }; 133 134 /* 135 * Register the NFS filesystems 136 */ 137 int __init register_nfs_fs(void) 138 { 139 int ret; 140 141 ret = register_filesystem(&nfs_fs_type); 142 if (ret < 0) 143 goto error_0; 144 145 ret = register_nfs4_fs(); 146 if (ret < 0) 147 goto error_1; 148 149 ret = nfs_register_sysctl(); 150 if (ret < 0) 151 goto error_2; 152 ret = register_shrinker(&acl_shrinker, "nfs-acl"); 153 if (ret < 0) 154 goto error_3; 155 #ifdef CONFIG_NFS_V4_2 156 nfs_ssc_register_ops(); 157 #endif 158 return 0; 159 error_3: 160 nfs_unregister_sysctl(); 161 error_2: 162 unregister_nfs4_fs(); 163 error_1: 164 unregister_filesystem(&nfs_fs_type); 165 error_0: 166 return ret; 167 } 168 169 /* 170 * Unregister the NFS filesystems 171 */ 172 void __exit unregister_nfs_fs(void) 173 { 174 unregister_shrinker(&acl_shrinker); 175 nfs_unregister_sysctl(); 176 unregister_nfs4_fs(); 177 #ifdef CONFIG_NFS_V4_2 178 nfs_ssc_unregister_ops(); 179 #endif 180 unregister_filesystem(&nfs_fs_type); 181 } 182 183 bool nfs_sb_active(struct super_block *sb) 184 { 185 struct nfs_server *server = NFS_SB(sb); 186 187 if (!atomic_inc_not_zero(&sb->s_active)) 188 return false; 189 if (atomic_inc_return(&server->active) != 1) 190 atomic_dec(&sb->s_active); 191 return true; 192 } 193 EXPORT_SYMBOL_GPL(nfs_sb_active); 194 195 void nfs_sb_deactive(struct super_block *sb) 196 { 197 struct nfs_server *server = NFS_SB(sb); 198 199 if (atomic_dec_and_test(&server->active)) 200 deactivate_super(sb); 201 } 202 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 203 204 static int __nfs_list_for_each_server(struct list_head *head, 205 int (*fn)(struct nfs_server *, void *), 206 void *data) 207 { 208 struct nfs_server *server, *last = NULL; 209 int ret = 0; 210 211 rcu_read_lock(); 212 list_for_each_entry_rcu(server, head, client_link) { 213 if (!(server->super && nfs_sb_active(server->super))) 214 continue; 215 rcu_read_unlock(); 216 if (last) 217 nfs_sb_deactive(last->super); 218 last = server; 219 ret = fn(server, data); 220 if (ret) 221 goto out; 222 rcu_read_lock(); 223 } 224 rcu_read_unlock(); 225 out: 226 if (last) 227 nfs_sb_deactive(last->super); 228 return ret; 229 } 230 231 int nfs_client_for_each_server(struct nfs_client *clp, 232 int (*fn)(struct nfs_server *, void *), 233 void *data) 234 { 235 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); 236 } 237 EXPORT_SYMBOL_GPL(nfs_client_for_each_server); 238 239 /* 240 * Deliver file system statistics to userspace 241 */ 242 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 243 { 244 struct nfs_server *server = NFS_SB(dentry->d_sb); 245 unsigned char blockbits; 246 unsigned long blockres; 247 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 248 struct nfs_fsstat res; 249 int error = -ENOMEM; 250 251 res.fattr = nfs_alloc_fattr(); 252 if (res.fattr == NULL) 253 goto out_err; 254 255 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 256 if (unlikely(error == -ESTALE)) { 257 struct dentry *pd_dentry; 258 259 pd_dentry = dget_parent(dentry); 260 nfs_zap_caches(d_inode(pd_dentry)); 261 dput(pd_dentry); 262 } 263 nfs_free_fattr(res.fattr); 264 if (error < 0) 265 goto out_err; 266 267 buf->f_type = NFS_SUPER_MAGIC; 268 269 /* 270 * Current versions of glibc do not correctly handle the 271 * case where f_frsize != f_bsize. Eventually we want to 272 * report the value of wtmult in this field. 273 */ 274 buf->f_frsize = dentry->d_sb->s_blocksize; 275 276 /* 277 * On most *nix systems, f_blocks, f_bfree, and f_bavail 278 * are reported in units of f_frsize. Linux hasn't had 279 * an f_frsize field in its statfs struct until recently, 280 * thus historically Linux's sys_statfs reports these 281 * fields in units of f_bsize. 282 */ 283 buf->f_bsize = dentry->d_sb->s_blocksize; 284 blockbits = dentry->d_sb->s_blocksize_bits; 285 blockres = (1 << blockbits) - 1; 286 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 287 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 288 buf->f_bavail = (res.abytes + blockres) >> blockbits; 289 290 buf->f_files = res.tfiles; 291 buf->f_ffree = res.afiles; 292 293 buf->f_namelen = server->namelen; 294 295 return 0; 296 297 out_err: 298 dprintk("%s: statfs error = %d\n", __func__, -error); 299 return error; 300 } 301 EXPORT_SYMBOL_GPL(nfs_statfs); 302 303 /* 304 * Map the security flavour number to a name 305 */ 306 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 307 { 308 static const struct { 309 rpc_authflavor_t flavour; 310 const char *str; 311 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 312 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 313 { RPC_AUTH_NULL, "null" }, 314 { RPC_AUTH_UNIX, "sys" }, 315 { RPC_AUTH_GSS_KRB5, "krb5" }, 316 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 317 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 318 { RPC_AUTH_GSS_LKEY, "lkey" }, 319 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 320 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 321 { RPC_AUTH_GSS_SPKM, "spkm" }, 322 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 323 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 324 { UINT_MAX, "unknown" } 325 }; 326 int i; 327 328 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 329 if (sec_flavours[i].flavour == flavour) 330 break; 331 } 332 return sec_flavours[i].str; 333 } 334 335 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 336 int showdefaults) 337 { 338 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 339 char *proto = NULL; 340 341 switch (sap->sa_family) { 342 case AF_INET: 343 switch (nfss->mountd_protocol) { 344 case IPPROTO_UDP: 345 proto = RPCBIND_NETID_UDP; 346 break; 347 case IPPROTO_TCP: 348 proto = RPCBIND_NETID_TCP; 349 break; 350 } 351 break; 352 case AF_INET6: 353 switch (nfss->mountd_protocol) { 354 case IPPROTO_UDP: 355 proto = RPCBIND_NETID_UDP6; 356 break; 357 case IPPROTO_TCP: 358 proto = RPCBIND_NETID_TCP6; 359 break; 360 } 361 break; 362 } 363 if (proto || showdefaults) 364 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 365 } 366 367 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 368 int showdefaults) 369 { 370 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 371 372 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 373 return; 374 375 switch (sap->sa_family) { 376 case AF_INET: { 377 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 378 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 379 break; 380 } 381 case AF_INET6: { 382 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 383 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 384 break; 385 } 386 default: 387 if (showdefaults) 388 seq_puts(m, ",mountaddr=unspecified"); 389 } 390 391 if (nfss->mountd_version || showdefaults) 392 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 393 if ((nfss->mountd_port && 394 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 395 showdefaults) 396 seq_printf(m, ",mountport=%u", nfss->mountd_port); 397 398 nfs_show_mountd_netid(m, nfss, showdefaults); 399 } 400 401 #if IS_ENABLED(CONFIG_NFS_V4) 402 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 403 int showdefaults) 404 { 405 struct nfs_client *clp = nfss->nfs_client; 406 407 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 408 } 409 #else 410 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 411 int showdefaults) 412 { 413 } 414 #endif 415 416 static void nfs_show_nfs_version(struct seq_file *m, 417 unsigned int version, 418 unsigned int minorversion) 419 { 420 seq_printf(m, ",vers=%u", version); 421 if (version == 4) 422 seq_printf(m, ".%u", minorversion); 423 } 424 425 /* 426 * Describe the mount options in force on this server representation 427 */ 428 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 429 int showdefaults) 430 { 431 static const struct proc_nfs_info { 432 int flag; 433 const char *str; 434 const char *nostr; 435 } nfs_info[] = { 436 { NFS_MOUNT_SOFT, ",soft", "" }, 437 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 438 { NFS_MOUNT_SOFTREVAL, ",softreval", "" }, 439 { NFS_MOUNT_POSIX, ",posix", "" }, 440 { NFS_MOUNT_NOCTO, ",nocto", "" }, 441 { NFS_MOUNT_NOAC, ",noac", "" }, 442 { NFS_MOUNT_NONLM, ",nolock", "" }, 443 { NFS_MOUNT_NOACL, ",noacl", "" }, 444 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 445 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 446 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 447 { 0, NULL, NULL } 448 }; 449 const struct proc_nfs_info *nfs_infop; 450 struct nfs_client *clp = nfss->nfs_client; 451 u32 version = clp->rpc_ops->version; 452 int local_flock, local_fcntl; 453 454 nfs_show_nfs_version(m, version, clp->cl_minorversion); 455 seq_printf(m, ",rsize=%u", nfss->rsize); 456 seq_printf(m, ",wsize=%u", nfss->wsize); 457 if (nfss->bsize != 0) 458 seq_printf(m, ",bsize=%u", nfss->bsize); 459 seq_printf(m, ",namlen=%u", nfss->namelen); 460 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 461 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 462 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 463 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 464 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 465 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 466 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 467 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 468 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 469 seq_puts(m, ",hard"); 470 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 471 if (nfss->flags & nfs_infop->flag) 472 seq_puts(m, nfs_infop->str); 473 else 474 seq_puts(m, nfs_infop->nostr); 475 } 476 rcu_read_lock(); 477 seq_printf(m, ",proto=%s", 478 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 479 rcu_read_unlock(); 480 if (clp->cl_nconnect > 0) 481 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 482 if (version == 4) { 483 if (clp->cl_max_connect > 1) 484 seq_printf(m, ",max_connect=%u", clp->cl_max_connect); 485 if (nfss->port != NFS_PORT) 486 seq_printf(m, ",port=%u", nfss->port); 487 } else 488 if (nfss->port) 489 seq_printf(m, ",port=%u", nfss->port); 490 491 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 492 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 493 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 494 495 if (version != 4) 496 nfs_show_mountd_options(m, nfss, showdefaults); 497 else 498 nfs_show_nfsv4_options(m, nfss, showdefaults); 499 500 if (nfss->options & NFS_OPTION_FSCACHE) 501 seq_puts(m, ",fsc"); 502 503 if (nfss->options & NFS_OPTION_MIGRATION) 504 seq_puts(m, ",migration"); 505 506 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 507 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 508 seq_puts(m, ",lookupcache=none"); 509 else 510 seq_puts(m, ",lookupcache=pos"); 511 } 512 513 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 514 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 515 516 if (!local_flock && !local_fcntl) 517 seq_puts(m, ",local_lock=none"); 518 else if (local_flock && local_fcntl) 519 seq_puts(m, ",local_lock=all"); 520 else if (local_flock) 521 seq_puts(m, ",local_lock=flock"); 522 else 523 seq_puts(m, ",local_lock=posix"); 524 525 if (nfss->flags & NFS_MOUNT_WRITE_EAGER) { 526 if (nfss->flags & NFS_MOUNT_WRITE_WAIT) 527 seq_puts(m, ",write=wait"); 528 else 529 seq_puts(m, ",write=eager"); 530 } 531 } 532 533 /* 534 * Describe the mount options on this VFS mountpoint 535 */ 536 int nfs_show_options(struct seq_file *m, struct dentry *root) 537 { 538 struct nfs_server *nfss = NFS_SB(root->d_sb); 539 540 nfs_show_mount_options(m, nfss, 0); 541 542 rcu_read_lock(); 543 seq_printf(m, ",addr=%s", 544 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 545 RPC_DISPLAY_ADDR)); 546 rcu_read_unlock(); 547 548 return 0; 549 } 550 EXPORT_SYMBOL_GPL(nfs_show_options); 551 552 #if IS_ENABLED(CONFIG_NFS_V4) 553 static void show_lease(struct seq_file *m, struct nfs_server *server) 554 { 555 struct nfs_client *clp = server->nfs_client; 556 unsigned long expire; 557 558 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 559 expire = clp->cl_last_renewal + clp->cl_lease_time; 560 seq_printf(m, ",lease_expired=%ld", 561 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 562 } 563 #ifdef CONFIG_NFS_V4_1 564 static void show_sessions(struct seq_file *m, struct nfs_server *server) 565 { 566 if (nfs4_has_session(server->nfs_client)) 567 seq_puts(m, ",sessions"); 568 } 569 #else 570 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 571 #endif 572 #endif 573 574 #ifdef CONFIG_NFS_V4_1 575 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 576 { 577 seq_printf(m, ",pnfs="); 578 if (server->pnfs_curr_ld) 579 seq_printf(m, "%s", server->pnfs_curr_ld->name); 580 else 581 seq_printf(m, "not configured"); 582 } 583 584 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 585 { 586 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 587 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 588 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 589 "date='%llu,%u'", 590 impl_id->name, impl_id->domain, 591 impl_id->date.seconds, impl_id->date.nseconds); 592 } 593 } 594 #else 595 #if IS_ENABLED(CONFIG_NFS_V4) 596 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 597 { 598 } 599 #endif 600 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 601 { 602 } 603 #endif 604 605 int nfs_show_devname(struct seq_file *m, struct dentry *root) 606 { 607 char *page = (char *) __get_free_page(GFP_KERNEL); 608 char *devname, *dummy; 609 int err = 0; 610 if (!page) 611 return -ENOMEM; 612 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 613 if (IS_ERR(devname)) 614 err = PTR_ERR(devname); 615 else 616 seq_escape(m, devname, " \t\n\\"); 617 free_page((unsigned long)page); 618 return err; 619 } 620 EXPORT_SYMBOL_GPL(nfs_show_devname); 621 622 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 623 { 624 seq_puts(m, "/"); 625 return 0; 626 } 627 EXPORT_SYMBOL_GPL(nfs_show_path); 628 629 /* 630 * Present statistical information for this VFS mountpoint 631 */ 632 int nfs_show_stats(struct seq_file *m, struct dentry *root) 633 { 634 int i, cpu; 635 struct nfs_server *nfss = NFS_SB(root->d_sb); 636 struct rpc_auth *auth = nfss->client->cl_auth; 637 struct nfs_iostats totals = { }; 638 639 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 640 641 /* 642 * Display all mount option settings 643 */ 644 seq_puts(m, "\n\topts:\t"); 645 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 646 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 647 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 648 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 649 nfs_show_mount_options(m, nfss, 1); 650 651 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 652 653 show_implementation_id(m, nfss); 654 655 seq_puts(m, "\n\tcaps:\t"); 656 seq_printf(m, "caps=0x%x", nfss->caps); 657 seq_printf(m, ",wtmult=%u", nfss->wtmult); 658 seq_printf(m, ",dtsize=%u", nfss->dtsize); 659 seq_printf(m, ",bsize=%u", nfss->bsize); 660 seq_printf(m, ",namlen=%u", nfss->namelen); 661 662 #if IS_ENABLED(CONFIG_NFS_V4) 663 if (nfss->nfs_client->rpc_ops->version == 4) { 664 seq_puts(m, "\n\tnfsv4:\t"); 665 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 666 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 667 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 668 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 669 show_sessions(m, nfss); 670 show_pnfs(m, nfss); 671 show_lease(m, nfss); 672 } 673 #endif 674 675 /* 676 * Display security flavor in effect for this mount 677 */ 678 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 679 if (auth->au_flavor) 680 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 681 682 /* 683 * Display superblock I/O counters 684 */ 685 for_each_possible_cpu(cpu) { 686 struct nfs_iostats *stats; 687 688 preempt_disable(); 689 stats = per_cpu_ptr(nfss->io_stats, cpu); 690 691 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 692 totals.events[i] += stats->events[i]; 693 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 694 totals.bytes[i] += stats->bytes[i]; 695 696 preempt_enable(); 697 } 698 699 seq_puts(m, "\n\tevents:\t"); 700 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 701 seq_printf(m, "%lu ", totals.events[i]); 702 seq_puts(m, "\n\tbytes:\t"); 703 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 704 seq_printf(m, "%Lu ", totals.bytes[i]); 705 seq_putc(m, '\n'); 706 707 rpc_clnt_show_stats(m, nfss->client); 708 709 return 0; 710 } 711 EXPORT_SYMBOL_GPL(nfs_show_stats); 712 713 /* 714 * Begin unmount by attempting to remove all automounted mountpoints we added 715 * in response to xdev traversals and referrals 716 */ 717 void nfs_umount_begin(struct super_block *sb) 718 { 719 struct nfs_server *server; 720 struct rpc_clnt *rpc; 721 722 server = NFS_SB(sb); 723 /* -EIO all pending I/O */ 724 rpc = server->client_acl; 725 if (!IS_ERR(rpc)) 726 rpc_killall_tasks(rpc); 727 rpc = server->client; 728 if (!IS_ERR(rpc)) 729 rpc_killall_tasks(rpc); 730 } 731 EXPORT_SYMBOL_GPL(nfs_umount_begin); 732 733 /* 734 * Return true if 'match' is in auth_info or auth_info is empty. 735 * Return false otherwise. 736 */ 737 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 738 rpc_authflavor_t match) 739 { 740 int i; 741 742 if (!auth_info->flavor_len) 743 return true; 744 745 for (i = 0; i < auth_info->flavor_len; i++) { 746 if (auth_info->flavors[i] == match) 747 return true; 748 } 749 return false; 750 } 751 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 752 753 /* 754 * Ensure that a specified authtype in ctx->auth_info is supported by 755 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and 756 * -EACCES if not. 757 */ 758 static int nfs_verify_authflavors(struct nfs_fs_context *ctx, 759 rpc_authflavor_t *server_authlist, 760 unsigned int count) 761 { 762 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 763 bool found_auth_null = false; 764 unsigned int i; 765 766 /* 767 * If the sec= mount option is used, the specified flavor or AUTH_NULL 768 * must be in the list returned by the server. 769 * 770 * AUTH_NULL has a special meaning when it's in the server list - it 771 * means that the server will ignore the rpc creds, so any flavor 772 * can be used but still use the sec= that was specified. 773 * 774 * Note also that the MNT procedure in MNTv1 does not return a list 775 * of supported security flavors. In this case, nfs_mount() fabricates 776 * a security flavor list containing just AUTH_NULL. 777 */ 778 for (i = 0; i < count; i++) { 779 flavor = server_authlist[i]; 780 781 if (nfs_auth_info_match(&ctx->auth_info, flavor)) 782 goto out; 783 784 if (flavor == RPC_AUTH_NULL) 785 found_auth_null = true; 786 } 787 788 if (found_auth_null) { 789 flavor = ctx->auth_info.flavors[0]; 790 goto out; 791 } 792 793 dfprintk(MOUNT, 794 "NFS: specified auth flavors not supported by server\n"); 795 return -EACCES; 796 797 out: 798 ctx->selected_flavor = flavor; 799 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); 800 return 0; 801 } 802 803 /* 804 * Use the remote server's MOUNT service to request the NFS file handle 805 * corresponding to the provided path. 806 */ 807 static int nfs_request_mount(struct fs_context *fc, 808 struct nfs_fh *root_fh, 809 rpc_authflavor_t *server_authlist, 810 unsigned int *server_authlist_len) 811 { 812 struct nfs_fs_context *ctx = nfs_fc2context(fc); 813 struct nfs_mount_request request = { 814 .sap = &ctx->mount_server._address, 815 .dirpath = ctx->nfs_server.export_path, 816 .protocol = ctx->mount_server.protocol, 817 .fh = root_fh, 818 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, 819 .auth_flav_len = server_authlist_len, 820 .auth_flavs = server_authlist, 821 .net = fc->net_ns, 822 }; 823 int status; 824 825 if (ctx->mount_server.version == 0) { 826 switch (ctx->version) { 827 default: 828 ctx->mount_server.version = NFS_MNT3_VERSION; 829 break; 830 case 2: 831 ctx->mount_server.version = NFS_MNT_VERSION; 832 } 833 } 834 request.version = ctx->mount_server.version; 835 836 if (ctx->mount_server.hostname) 837 request.hostname = ctx->mount_server.hostname; 838 else 839 request.hostname = ctx->nfs_server.hostname; 840 841 /* 842 * Construct the mount server's address. 843 */ 844 if (ctx->mount_server.address.sa_family == AF_UNSPEC) { 845 memcpy(request.sap, &ctx->nfs_server._address, 846 ctx->nfs_server.addrlen); 847 ctx->mount_server.addrlen = ctx->nfs_server.addrlen; 848 } 849 request.salen = ctx->mount_server.addrlen; 850 nfs_set_port(request.sap, &ctx->mount_server.port, 0); 851 852 /* 853 * Now ask the mount server to map our export path 854 * to a file handle. 855 */ 856 status = nfs_mount(&request, ctx->timeo, ctx->retrans); 857 if (status != 0) { 858 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 859 request.hostname, status); 860 return status; 861 } 862 863 return 0; 864 } 865 866 static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) 867 { 868 struct nfs_fs_context *ctx = nfs_fc2context(fc); 869 int status; 870 unsigned int i; 871 bool tried_auth_unix = false; 872 bool auth_null_in_list = false; 873 struct nfs_server *server = ERR_PTR(-EACCES); 874 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 875 unsigned int authlist_len = ARRAY_SIZE(authlist); 876 877 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); 878 if (status) 879 return ERR_PTR(status); 880 881 /* 882 * Was a sec= authflavor specified in the options? First, verify 883 * whether the server supports it, and then just try to use it if so. 884 */ 885 if (ctx->auth_info.flavor_len > 0) { 886 status = nfs_verify_authflavors(ctx, authlist, authlist_len); 887 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 888 ctx->selected_flavor); 889 if (status) 890 return ERR_PTR(status); 891 return ctx->nfs_mod->rpc_ops->create_server(fc); 892 } 893 894 /* 895 * No sec= option was provided. RFC 2623, section 2.7 suggests we 896 * SHOULD prefer the flavor listed first. However, some servers list 897 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 898 */ 899 for (i = 0; i < authlist_len; ++i) { 900 rpc_authflavor_t flavor; 901 struct rpcsec_gss_info info; 902 903 flavor = authlist[i]; 904 switch (flavor) { 905 case RPC_AUTH_UNIX: 906 tried_auth_unix = true; 907 break; 908 case RPC_AUTH_NULL: 909 auth_null_in_list = true; 910 continue; 911 default: 912 if (rpcauth_get_gssinfo(flavor, &info) != 0) 913 continue; 914 break; 915 } 916 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 917 ctx->selected_flavor = flavor; 918 server = ctx->nfs_mod->rpc_ops->create_server(fc); 919 if (!IS_ERR(server)) 920 return server; 921 } 922 923 /* 924 * Nothing we tried so far worked. At this point, give up if we've 925 * already tried AUTH_UNIX or if the server's list doesn't contain 926 * AUTH_NULL 927 */ 928 if (tried_auth_unix || !auth_null_in_list) 929 return server; 930 931 /* Last chance! Try AUTH_UNIX */ 932 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 933 ctx->selected_flavor = RPC_AUTH_UNIX; 934 return ctx->nfs_mod->rpc_ops->create_server(fc); 935 } 936 937 int nfs_try_get_tree(struct fs_context *fc) 938 { 939 struct nfs_fs_context *ctx = nfs_fc2context(fc); 940 941 if (ctx->need_mount) 942 ctx->server = nfs_try_mount_request(fc); 943 else 944 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); 945 946 return nfs_get_tree_common(fc); 947 } 948 EXPORT_SYMBOL_GPL(nfs_try_get_tree); 949 950 951 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 952 | NFS_MOUNT_SECURE \ 953 | NFS_MOUNT_TCP \ 954 | NFS_MOUNT_VER3 \ 955 | NFS_MOUNT_KERBEROS \ 956 | NFS_MOUNT_NONLM \ 957 | NFS_MOUNT_BROKEN_SUID \ 958 | NFS_MOUNT_STRICTLOCK \ 959 | NFS_MOUNT_LEGACY_INTERFACE) 960 961 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 962 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 963 964 static int 965 nfs_compare_remount_data(struct nfs_server *nfss, 966 struct nfs_fs_context *ctx) 967 { 968 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 969 ctx->rsize != nfss->rsize || 970 ctx->wsize != nfss->wsize || 971 ctx->version != nfss->nfs_client->rpc_ops->version || 972 ctx->minorversion != nfss->nfs_client->cl_minorversion || 973 ctx->retrans != nfss->client->cl_timeout->to_retries || 974 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || 975 ctx->acregmin != nfss->acregmin / HZ || 976 ctx->acregmax != nfss->acregmax / HZ || 977 ctx->acdirmin != nfss->acdirmin / HZ || 978 ctx->acdirmax != nfss->acdirmax / HZ || 979 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 980 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || 981 ctx->nfs_server.port != nfss->port || 982 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 983 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, 984 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 985 return -EINVAL; 986 987 return 0; 988 } 989 990 int nfs_reconfigure(struct fs_context *fc) 991 { 992 struct nfs_fs_context *ctx = nfs_fc2context(fc); 993 struct super_block *sb = fc->root->d_sb; 994 struct nfs_server *nfss = sb->s_fs_info; 995 int ret; 996 997 sync_filesystem(sb); 998 999 /* 1000 * Userspace mount programs that send binary options generally send 1001 * them populated with default values. We have no way to know which 1002 * ones were explicitly specified. Fall back to legacy behavior and 1003 * just return success. 1004 */ 1005 if (ctx->skip_reconfig_option_check) 1006 return 0; 1007 1008 /* 1009 * noac is a special case. It implies -o sync, but that's not 1010 * necessarily reflected in the mtab options. reconfigure_super 1011 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 1012 * remount options, so we have to explicitly reset it. 1013 */ 1014 if (ctx->flags & NFS_MOUNT_NOAC) { 1015 fc->sb_flags |= SB_SYNCHRONOUS; 1016 fc->sb_flags_mask |= SB_SYNCHRONOUS; 1017 } 1018 1019 /* compare new mount options with old ones */ 1020 ret = nfs_compare_remount_data(nfss, ctx); 1021 if (ret) 1022 return ret; 1023 1024 return nfs_probe_server(nfss, NFS_FH(d_inode(fc->root))); 1025 } 1026 EXPORT_SYMBOL_GPL(nfs_reconfigure); 1027 1028 /* 1029 * Finish setting up an NFS superblock 1030 */ 1031 static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 1032 { 1033 struct nfs_server *server = NFS_SB(sb); 1034 1035 sb->s_blocksize_bits = 0; 1036 sb->s_blocksize = 0; 1037 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 1038 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 1039 if (ctx->bsize) 1040 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); 1041 1042 switch (server->nfs_client->rpc_ops->version) { 1043 case 2: 1044 sb->s_time_gran = 1000; 1045 sb->s_time_min = 0; 1046 sb->s_time_max = U32_MAX; 1047 break; 1048 case 3: 1049 /* 1050 * The VFS shouldn't apply the umask to mode bits. 1051 * We will do so ourselves when necessary. 1052 */ 1053 sb->s_flags |= SB_POSIXACL; 1054 sb->s_time_gran = 1; 1055 sb->s_time_min = 0; 1056 sb->s_time_max = U32_MAX; 1057 sb->s_export_op = &nfs_export_ops; 1058 break; 1059 case 4: 1060 sb->s_flags |= SB_POSIXACL; 1061 sb->s_time_gran = 1; 1062 sb->s_time_min = S64_MIN; 1063 sb->s_time_max = S64_MAX; 1064 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1065 sb->s_export_op = &nfs_export_ops; 1066 break; 1067 } 1068 1069 sb->s_magic = NFS_SUPER_MAGIC; 1070 1071 /* We probably want something more informative here */ 1072 snprintf(sb->s_id, sizeof(sb->s_id), 1073 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1074 1075 if (sb->s_blocksize == 0) 1076 sb->s_blocksize = nfs_block_bits(server->wsize, 1077 &sb->s_blocksize_bits); 1078 1079 nfs_super_set_maxbytes(sb, server->maxfilesize); 1080 server->has_sec_mnt_opts = ctx->has_sec_mnt_opts; 1081 } 1082 1083 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, 1084 const struct fs_context *fc) 1085 { 1086 const struct nfs_server *a = s->s_fs_info; 1087 const struct rpc_clnt *clnt_a = a->client; 1088 const struct rpc_clnt *clnt_b = b->client; 1089 1090 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) 1091 goto Ebusy; 1092 if (a->nfs_client != b->nfs_client) 1093 goto Ebusy; 1094 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 1095 goto Ebusy; 1096 if (a->wsize != b->wsize) 1097 goto Ebusy; 1098 if (a->rsize != b->rsize) 1099 goto Ebusy; 1100 if (a->acregmin != b->acregmin) 1101 goto Ebusy; 1102 if (a->acregmax != b->acregmax) 1103 goto Ebusy; 1104 if (a->acdirmin != b->acdirmin) 1105 goto Ebusy; 1106 if (a->acdirmax != b->acdirmax) 1107 goto Ebusy; 1108 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1109 goto Ebusy; 1110 return 1; 1111 Ebusy: 1112 return 0; 1113 } 1114 1115 static int nfs_set_super(struct super_block *s, struct fs_context *fc) 1116 { 1117 struct nfs_server *server = fc->s_fs_info; 1118 int ret; 1119 1120 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 1121 ret = set_anon_super(s, server); 1122 if (ret == 0) 1123 server->s_dev = s->s_dev; 1124 return ret; 1125 } 1126 1127 static int nfs_compare_super_address(struct nfs_server *server1, 1128 struct nfs_server *server2) 1129 { 1130 struct sockaddr *sap1, *sap2; 1131 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 1132 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 1133 1134 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 1135 return 0; 1136 1137 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1138 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1139 1140 if (sap1->sa_family != sap2->sa_family) 1141 return 0; 1142 1143 switch (sap1->sa_family) { 1144 case AF_INET: { 1145 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1146 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1147 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1148 return 0; 1149 if (sin1->sin_port != sin2->sin_port) 1150 return 0; 1151 break; 1152 } 1153 case AF_INET6: { 1154 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1155 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1156 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1157 return 0; 1158 if (sin1->sin6_port != sin2->sin6_port) 1159 return 0; 1160 break; 1161 } 1162 default: 1163 return 0; 1164 } 1165 1166 return 1; 1167 } 1168 1169 static int nfs_compare_userns(const struct nfs_server *old, 1170 const struct nfs_server *new) 1171 { 1172 const struct user_namespace *oldns = &init_user_ns; 1173 const struct user_namespace *newns = &init_user_ns; 1174 1175 if (old->client && old->client->cl_cred) 1176 oldns = old->client->cl_cred->user_ns; 1177 if (new->client && new->client->cl_cred) 1178 newns = new->client->cl_cred->user_ns; 1179 if (oldns != newns) 1180 return 0; 1181 return 1; 1182 } 1183 1184 static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) 1185 { 1186 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); 1187 1188 if (!nfs_compare_super_address(old, server)) 1189 return 0; 1190 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1191 if (old->flags & NFS_MOUNT_UNSHARED) 1192 return 0; 1193 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1194 return 0; 1195 if (!nfs_compare_userns(old, server)) 1196 return 0; 1197 if ((old->has_sec_mnt_opts || fc->security) && 1198 security_sb_mnt_opts_compat(sb, fc->security)) 1199 return 0; 1200 return nfs_compare_mount_options(sb, server, fc); 1201 } 1202 1203 #ifdef CONFIG_NFS_FSCACHE 1204 static int nfs_get_cache_cookie(struct super_block *sb, 1205 struct nfs_fs_context *ctx) 1206 { 1207 struct nfs_server *nfss = NFS_SB(sb); 1208 char *uniq = NULL; 1209 int ulen = 0; 1210 1211 nfss->fscache = NULL; 1212 1213 if (!ctx) 1214 return 0; 1215 1216 if (ctx->clone_data.sb) { 1217 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); 1218 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 1219 return 0; 1220 if (mnt_s->fscache_uniq) { 1221 uniq = mnt_s->fscache_uniq; 1222 ulen = strlen(uniq); 1223 } 1224 } else { 1225 if (!(ctx->options & NFS_OPTION_FSCACHE)) 1226 return 0; 1227 if (ctx->fscache_uniq) { 1228 uniq = ctx->fscache_uniq; 1229 ulen = strlen(ctx->fscache_uniq); 1230 } 1231 } 1232 1233 return nfs_fscache_get_super_cookie(sb, uniq, ulen); 1234 } 1235 #else 1236 static int nfs_get_cache_cookie(struct super_block *sb, 1237 struct nfs_fs_context *ctx) 1238 { 1239 return 0; 1240 } 1241 #endif 1242 1243 int nfs_get_tree_common(struct fs_context *fc) 1244 { 1245 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1246 struct super_block *s; 1247 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; 1248 struct nfs_server *server = ctx->server; 1249 int error; 1250 1251 ctx->server = NULL; 1252 if (IS_ERR(server)) 1253 return PTR_ERR(server); 1254 1255 if (server->flags & NFS_MOUNT_UNSHARED) 1256 compare_super = NULL; 1257 1258 /* -o noac implies -o sync */ 1259 if (server->flags & NFS_MOUNT_NOAC) 1260 fc->sb_flags |= SB_SYNCHRONOUS; 1261 1262 if (ctx->clone_data.sb) 1263 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) 1264 fc->sb_flags |= SB_SYNCHRONOUS; 1265 1266 /* Get a superblock - note that we may end up sharing one that already exists */ 1267 fc->s_fs_info = server; 1268 s = sget_fc(fc, compare_super, nfs_set_super); 1269 fc->s_fs_info = NULL; 1270 if (IS_ERR(s)) { 1271 error = PTR_ERR(s); 1272 nfs_errorf(fc, "NFS: Couldn't get superblock"); 1273 goto out_err_nosb; 1274 } 1275 1276 if (s->s_fs_info != server) { 1277 nfs_free_server(server); 1278 server = NULL; 1279 } else { 1280 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 1281 MINOR(server->s_dev)); 1282 if (error) 1283 goto error_splat_super; 1284 s->s_bdi->io_pages = server->rpages; 1285 server->super = s; 1286 } 1287 1288 if (!s->s_root) { 1289 unsigned bsize = ctx->clone_data.inherited_bsize; 1290 /* initial superblock/root creation */ 1291 nfs_fill_super(s, ctx); 1292 if (bsize) { 1293 s->s_blocksize_bits = bsize; 1294 s->s_blocksize = 1U << bsize; 1295 } 1296 error = nfs_get_cache_cookie(s, ctx); 1297 if (error < 0) 1298 goto error_splat_super; 1299 } 1300 1301 error = nfs_get_root(s, fc); 1302 if (error < 0) { 1303 nfs_errorf(fc, "NFS: Couldn't get root dentry"); 1304 goto error_splat_super; 1305 } 1306 1307 s->s_flags |= SB_ACTIVE; 1308 error = 0; 1309 1310 out: 1311 return error; 1312 1313 out_err_nosb: 1314 nfs_free_server(server); 1315 goto out; 1316 error_splat_super: 1317 deactivate_locked_super(s); 1318 goto out; 1319 } 1320 1321 /* 1322 * Destroy an NFS2/3 superblock 1323 */ 1324 void nfs_kill_super(struct super_block *s) 1325 { 1326 struct nfs_server *server = NFS_SB(s); 1327 dev_t dev = s->s_dev; 1328 1329 generic_shutdown_super(s); 1330 1331 nfs_fscache_release_super_cookie(s); 1332 1333 nfs_free_server(server); 1334 free_anon_bdev(dev); 1335 } 1336 EXPORT_SYMBOL_GPL(nfs_kill_super); 1337 1338 #if IS_ENABLED(CONFIG_NFS_V4) 1339 1340 /* 1341 * NFS v4 module parameters need to stay in the 1342 * NFS client for backwards compatibility 1343 */ 1344 unsigned int nfs_callback_set_tcpport; 1345 unsigned short nfs_callback_nr_threads; 1346 /* Default cache timeout is 10 minutes */ 1347 unsigned int nfs_idmap_cache_timeout = 600; 1348 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 1349 bool nfs4_disable_idmapping = true; 1350 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 1351 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 1352 unsigned short send_implementation_id = 1; 1353 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 1354 bool recover_lost_locks = false; 1355 1356 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 1357 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 1358 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 1359 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 1360 EXPORT_SYMBOL_GPL(max_session_slots); 1361 EXPORT_SYMBOL_GPL(max_session_cb_slots); 1362 EXPORT_SYMBOL_GPL(send_implementation_id); 1363 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 1364 EXPORT_SYMBOL_GPL(recover_lost_locks); 1365 1366 #define NFS_CALLBACK_MAXPORTNR (65535U) 1367 1368 static int param_set_portnr(const char *val, const struct kernel_param *kp) 1369 { 1370 unsigned long num; 1371 int ret; 1372 1373 if (!val) 1374 return -EINVAL; 1375 ret = kstrtoul(val, 0, &num); 1376 if (ret || num > NFS_CALLBACK_MAXPORTNR) 1377 return -EINVAL; 1378 *((unsigned int *)kp->arg) = num; 1379 return 0; 1380 } 1381 static const struct kernel_param_ops param_ops_portnr = { 1382 .set = param_set_portnr, 1383 .get = param_get_uint, 1384 }; 1385 #define param_check_portnr(name, p) __param_check(name, p, unsigned int) 1386 1387 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 1388 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 1389 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 1390 "assigned to the NFSv4 callback channels."); 1391 module_param(nfs_idmap_cache_timeout, int, 0644); 1392 module_param(nfs4_disable_idmapping, bool, 0644); 1393 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 1394 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 1395 MODULE_PARM_DESC(nfs4_disable_idmapping, 1396 "Turn off NFSv4 idmapping when using 'sec=sys'"); 1397 module_param(max_session_slots, ushort, 0644); 1398 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 1399 "requests the client will negotiate"); 1400 module_param(max_session_cb_slots, ushort, 0644); 1401 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 1402 "callbacks the client will process for a given server"); 1403 module_param(send_implementation_id, ushort, 0644); 1404 MODULE_PARM_DESC(send_implementation_id, 1405 "Send implementation ID with NFSv4.1 exchange_id"); 1406 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 1407 1408 module_param(recover_lost_locks, bool, 0644); 1409 MODULE_PARM_DESC(recover_lost_locks, 1410 "If the server reports that a lock might be lost, " 1411 "try to recover it risking data corruption."); 1412 1413 1414 #endif /* CONFIG_NFS_V4 */ 1415