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 #ifdef CONFIG_NFSD_V4 120 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); 121 #endif 122 } 123 124 static void nfs_ssc_unregister_ops(void) 125 { 126 #ifdef CONFIG_NFSD_V4 127 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); 128 #endif 129 } 130 #endif /* CONFIG_NFS_V4_2 */ 131 132 static struct shrinker acl_shrinker = { 133 .count_objects = nfs_access_cache_count, 134 .scan_objects = nfs_access_cache_scan, 135 .seeks = DEFAULT_SEEKS, 136 }; 137 138 /* 139 * Register the NFS filesystems 140 */ 141 int __init register_nfs_fs(void) 142 { 143 int ret; 144 145 ret = register_filesystem(&nfs_fs_type); 146 if (ret < 0) 147 goto error_0; 148 149 ret = register_nfs4_fs(); 150 if (ret < 0) 151 goto error_1; 152 153 ret = nfs_register_sysctl(); 154 if (ret < 0) 155 goto error_2; 156 ret = register_shrinker(&acl_shrinker); 157 if (ret < 0) 158 goto error_3; 159 #ifdef CONFIG_NFS_V4_2 160 nfs_ssc_register_ops(); 161 #endif 162 return 0; 163 error_3: 164 nfs_unregister_sysctl(); 165 error_2: 166 unregister_nfs4_fs(); 167 error_1: 168 unregister_filesystem(&nfs_fs_type); 169 error_0: 170 return ret; 171 } 172 173 /* 174 * Unregister the NFS filesystems 175 */ 176 void __exit unregister_nfs_fs(void) 177 { 178 unregister_shrinker(&acl_shrinker); 179 nfs_unregister_sysctl(); 180 unregister_nfs4_fs(); 181 #ifdef CONFIG_NFS_V4_2 182 nfs_ssc_unregister_ops(); 183 #endif 184 unregister_filesystem(&nfs_fs_type); 185 } 186 187 bool nfs_sb_active(struct super_block *sb) 188 { 189 struct nfs_server *server = NFS_SB(sb); 190 191 if (!atomic_inc_not_zero(&sb->s_active)) 192 return false; 193 if (atomic_inc_return(&server->active) != 1) 194 atomic_dec(&sb->s_active); 195 return true; 196 } 197 EXPORT_SYMBOL_GPL(nfs_sb_active); 198 199 void nfs_sb_deactive(struct super_block *sb) 200 { 201 struct nfs_server *server = NFS_SB(sb); 202 203 if (atomic_dec_and_test(&server->active)) 204 deactivate_super(sb); 205 } 206 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 207 208 static int __nfs_list_for_each_server(struct list_head *head, 209 int (*fn)(struct nfs_server *, void *), 210 void *data) 211 { 212 struct nfs_server *server, *last = NULL; 213 int ret = 0; 214 215 rcu_read_lock(); 216 list_for_each_entry_rcu(server, head, client_link) { 217 if (!(server->super && nfs_sb_active(server->super))) 218 continue; 219 rcu_read_unlock(); 220 if (last) 221 nfs_sb_deactive(last->super); 222 last = server; 223 ret = fn(server, data); 224 if (ret) 225 goto out; 226 rcu_read_lock(); 227 } 228 rcu_read_unlock(); 229 out: 230 if (last) 231 nfs_sb_deactive(last->super); 232 return ret; 233 } 234 235 int nfs_client_for_each_server(struct nfs_client *clp, 236 int (*fn)(struct nfs_server *, void *), 237 void *data) 238 { 239 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); 240 } 241 EXPORT_SYMBOL_GPL(nfs_client_for_each_server); 242 243 /* 244 * Deliver file system statistics to userspace 245 */ 246 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 247 { 248 struct nfs_server *server = NFS_SB(dentry->d_sb); 249 unsigned char blockbits; 250 unsigned long blockres; 251 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 252 struct nfs_fsstat res; 253 int error = -ENOMEM; 254 255 res.fattr = nfs_alloc_fattr(); 256 if (res.fattr == NULL) 257 goto out_err; 258 259 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 260 if (unlikely(error == -ESTALE)) { 261 struct dentry *pd_dentry; 262 263 pd_dentry = dget_parent(dentry); 264 nfs_zap_caches(d_inode(pd_dentry)); 265 dput(pd_dentry); 266 } 267 nfs_free_fattr(res.fattr); 268 if (error < 0) 269 goto out_err; 270 271 buf->f_type = NFS_SUPER_MAGIC; 272 273 /* 274 * Current versions of glibc do not correctly handle the 275 * case where f_frsize != f_bsize. Eventually we want to 276 * report the value of wtmult in this field. 277 */ 278 buf->f_frsize = dentry->d_sb->s_blocksize; 279 280 /* 281 * On most *nix systems, f_blocks, f_bfree, and f_bavail 282 * are reported in units of f_frsize. Linux hasn't had 283 * an f_frsize field in its statfs struct until recently, 284 * thus historically Linux's sys_statfs reports these 285 * fields in units of f_bsize. 286 */ 287 buf->f_bsize = dentry->d_sb->s_blocksize; 288 blockbits = dentry->d_sb->s_blocksize_bits; 289 blockres = (1 << blockbits) - 1; 290 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 291 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 292 buf->f_bavail = (res.abytes + blockres) >> blockbits; 293 294 buf->f_files = res.tfiles; 295 buf->f_ffree = res.afiles; 296 297 buf->f_namelen = server->namelen; 298 299 return 0; 300 301 out_err: 302 dprintk("%s: statfs error = %d\n", __func__, -error); 303 return error; 304 } 305 EXPORT_SYMBOL_GPL(nfs_statfs); 306 307 /* 308 * Map the security flavour number to a name 309 */ 310 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 311 { 312 static const struct { 313 rpc_authflavor_t flavour; 314 const char *str; 315 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 316 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 317 { RPC_AUTH_NULL, "null" }, 318 { RPC_AUTH_UNIX, "sys" }, 319 { RPC_AUTH_GSS_KRB5, "krb5" }, 320 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 321 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 322 { RPC_AUTH_GSS_LKEY, "lkey" }, 323 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 324 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 325 { RPC_AUTH_GSS_SPKM, "spkm" }, 326 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 327 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 328 { UINT_MAX, "unknown" } 329 }; 330 int i; 331 332 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 333 if (sec_flavours[i].flavour == flavour) 334 break; 335 } 336 return sec_flavours[i].str; 337 } 338 339 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 340 int showdefaults) 341 { 342 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 343 char *proto = NULL; 344 345 switch (sap->sa_family) { 346 case AF_INET: 347 switch (nfss->mountd_protocol) { 348 case IPPROTO_UDP: 349 proto = RPCBIND_NETID_UDP; 350 break; 351 case IPPROTO_TCP: 352 proto = RPCBIND_NETID_TCP; 353 break; 354 } 355 break; 356 case AF_INET6: 357 switch (nfss->mountd_protocol) { 358 case IPPROTO_UDP: 359 proto = RPCBIND_NETID_UDP6; 360 break; 361 case IPPROTO_TCP: 362 proto = RPCBIND_NETID_TCP6; 363 break; 364 } 365 break; 366 } 367 if (proto || showdefaults) 368 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 369 } 370 371 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 372 int showdefaults) 373 { 374 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 375 376 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 377 return; 378 379 switch (sap->sa_family) { 380 case AF_INET: { 381 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 382 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 383 break; 384 } 385 case AF_INET6: { 386 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 387 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 388 break; 389 } 390 default: 391 if (showdefaults) 392 seq_puts(m, ",mountaddr=unspecified"); 393 } 394 395 if (nfss->mountd_version || showdefaults) 396 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 397 if ((nfss->mountd_port && 398 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 399 showdefaults) 400 seq_printf(m, ",mountport=%u", nfss->mountd_port); 401 402 nfs_show_mountd_netid(m, nfss, showdefaults); 403 } 404 405 #if IS_ENABLED(CONFIG_NFS_V4) 406 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 407 int showdefaults) 408 { 409 struct nfs_client *clp = nfss->nfs_client; 410 411 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 412 } 413 #else 414 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 415 int showdefaults) 416 { 417 } 418 #endif 419 420 static void nfs_show_nfs_version(struct seq_file *m, 421 unsigned int version, 422 unsigned int minorversion) 423 { 424 seq_printf(m, ",vers=%u", version); 425 if (version == 4) 426 seq_printf(m, ".%u", minorversion); 427 } 428 429 /* 430 * Describe the mount options in force on this server representation 431 */ 432 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 433 int showdefaults) 434 { 435 static const struct proc_nfs_info { 436 int flag; 437 const char *str; 438 const char *nostr; 439 } nfs_info[] = { 440 { NFS_MOUNT_SOFT, ",soft", "" }, 441 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 442 { NFS_MOUNT_SOFTREVAL, ",softreval", "" }, 443 { NFS_MOUNT_POSIX, ",posix", "" }, 444 { NFS_MOUNT_NOCTO, ",nocto", "" }, 445 { NFS_MOUNT_NOAC, ",noac", "" }, 446 { NFS_MOUNT_NONLM, ",nolock", "" }, 447 { NFS_MOUNT_NOACL, ",noacl", "" }, 448 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 449 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 450 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 451 { 0, NULL, NULL } 452 }; 453 const struct proc_nfs_info *nfs_infop; 454 struct nfs_client *clp = nfss->nfs_client; 455 u32 version = clp->rpc_ops->version; 456 int local_flock, local_fcntl; 457 458 nfs_show_nfs_version(m, version, clp->cl_minorversion); 459 seq_printf(m, ",rsize=%u", nfss->rsize); 460 seq_printf(m, ",wsize=%u", nfss->wsize); 461 if (nfss->bsize != 0) 462 seq_printf(m, ",bsize=%u", nfss->bsize); 463 seq_printf(m, ",namlen=%u", nfss->namelen); 464 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 465 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 466 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 467 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 468 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 469 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 470 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 471 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 472 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 473 seq_puts(m, ",hard"); 474 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 475 if (nfss->flags & nfs_infop->flag) 476 seq_puts(m, nfs_infop->str); 477 else 478 seq_puts(m, nfs_infop->nostr); 479 } 480 rcu_read_lock(); 481 seq_printf(m, ",proto=%s", 482 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 483 rcu_read_unlock(); 484 if (clp->cl_nconnect > 0) 485 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 486 if (version == 4) { 487 if (nfss->port != NFS_PORT) 488 seq_printf(m, ",port=%u", nfss->port); 489 } else 490 if (nfss->port) 491 seq_printf(m, ",port=%u", nfss->port); 492 493 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 494 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 495 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 496 497 if (version != 4) 498 nfs_show_mountd_options(m, nfss, showdefaults); 499 else 500 nfs_show_nfsv4_options(m, nfss, showdefaults); 501 502 if (nfss->options & NFS_OPTION_FSCACHE) 503 seq_puts(m, ",fsc"); 504 505 if (nfss->options & NFS_OPTION_MIGRATION) 506 seq_puts(m, ",migration"); 507 508 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 509 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 510 seq_puts(m, ",lookupcache=none"); 511 else 512 seq_puts(m, ",lookupcache=pos"); 513 } 514 515 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 516 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 517 518 if (!local_flock && !local_fcntl) 519 seq_puts(m, ",local_lock=none"); 520 else if (local_flock && local_fcntl) 521 seq_puts(m, ",local_lock=all"); 522 else if (local_flock) 523 seq_puts(m, ",local_lock=flock"); 524 else 525 seq_puts(m, ",local_lock=posix"); 526 } 527 528 /* 529 * Describe the mount options on this VFS mountpoint 530 */ 531 int nfs_show_options(struct seq_file *m, struct dentry *root) 532 { 533 struct nfs_server *nfss = NFS_SB(root->d_sb); 534 535 nfs_show_mount_options(m, nfss, 0); 536 537 rcu_read_lock(); 538 seq_printf(m, ",addr=%s", 539 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 540 RPC_DISPLAY_ADDR)); 541 rcu_read_unlock(); 542 543 return 0; 544 } 545 EXPORT_SYMBOL_GPL(nfs_show_options); 546 547 #if IS_ENABLED(CONFIG_NFS_V4) 548 static void show_lease(struct seq_file *m, struct nfs_server *server) 549 { 550 struct nfs_client *clp = server->nfs_client; 551 unsigned long expire; 552 553 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 554 expire = clp->cl_last_renewal + clp->cl_lease_time; 555 seq_printf(m, ",lease_expired=%ld", 556 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 557 } 558 #ifdef CONFIG_NFS_V4_1 559 static void show_sessions(struct seq_file *m, struct nfs_server *server) 560 { 561 if (nfs4_has_session(server->nfs_client)) 562 seq_puts(m, ",sessions"); 563 } 564 #else 565 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 566 #endif 567 #endif 568 569 #ifdef CONFIG_NFS_V4_1 570 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 571 { 572 seq_printf(m, ",pnfs="); 573 if (server->pnfs_curr_ld) 574 seq_printf(m, "%s", server->pnfs_curr_ld->name); 575 else 576 seq_printf(m, "not configured"); 577 } 578 579 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 580 { 581 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 582 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 583 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 584 "date='%llu,%u'", 585 impl_id->name, impl_id->domain, 586 impl_id->date.seconds, impl_id->date.nseconds); 587 } 588 } 589 #else 590 #if IS_ENABLED(CONFIG_NFS_V4) 591 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 592 { 593 } 594 #endif 595 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 596 { 597 } 598 #endif 599 600 int nfs_show_devname(struct seq_file *m, struct dentry *root) 601 { 602 char *page = (char *) __get_free_page(GFP_KERNEL); 603 char *devname, *dummy; 604 int err = 0; 605 if (!page) 606 return -ENOMEM; 607 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 608 if (IS_ERR(devname)) 609 err = PTR_ERR(devname); 610 else 611 seq_escape(m, devname, " \t\n\\"); 612 free_page((unsigned long)page); 613 return err; 614 } 615 EXPORT_SYMBOL_GPL(nfs_show_devname); 616 617 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 618 { 619 seq_puts(m, "/"); 620 return 0; 621 } 622 EXPORT_SYMBOL_GPL(nfs_show_path); 623 624 /* 625 * Present statistical information for this VFS mountpoint 626 */ 627 int nfs_show_stats(struct seq_file *m, struct dentry *root) 628 { 629 int i, cpu; 630 struct nfs_server *nfss = NFS_SB(root->d_sb); 631 struct rpc_auth *auth = nfss->client->cl_auth; 632 struct nfs_iostats totals = { }; 633 634 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 635 636 /* 637 * Display all mount option settings 638 */ 639 seq_puts(m, "\n\topts:\t"); 640 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 641 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 642 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 643 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 644 nfs_show_mount_options(m, nfss, 1); 645 646 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 647 648 show_implementation_id(m, nfss); 649 650 seq_puts(m, "\n\tcaps:\t"); 651 seq_printf(m, "caps=0x%x", nfss->caps); 652 seq_printf(m, ",wtmult=%u", nfss->wtmult); 653 seq_printf(m, ",dtsize=%u", nfss->dtsize); 654 seq_printf(m, ",bsize=%u", nfss->bsize); 655 seq_printf(m, ",namlen=%u", nfss->namelen); 656 657 #if IS_ENABLED(CONFIG_NFS_V4) 658 if (nfss->nfs_client->rpc_ops->version == 4) { 659 seq_puts(m, "\n\tnfsv4:\t"); 660 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 661 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 662 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 663 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 664 show_sessions(m, nfss); 665 show_pnfs(m, nfss); 666 show_lease(m, nfss); 667 } 668 #endif 669 670 /* 671 * Display security flavor in effect for this mount 672 */ 673 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 674 if (auth->au_flavor) 675 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 676 677 /* 678 * Display superblock I/O counters 679 */ 680 for_each_possible_cpu(cpu) { 681 struct nfs_iostats *stats; 682 683 preempt_disable(); 684 stats = per_cpu_ptr(nfss->io_stats, cpu); 685 686 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 687 totals.events[i] += stats->events[i]; 688 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 689 totals.bytes[i] += stats->bytes[i]; 690 #ifdef CONFIG_NFS_FSCACHE 691 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 692 totals.fscache[i] += stats->fscache[i]; 693 #endif 694 695 preempt_enable(); 696 } 697 698 seq_puts(m, "\n\tevents:\t"); 699 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 700 seq_printf(m, "%lu ", totals.events[i]); 701 seq_puts(m, "\n\tbytes:\t"); 702 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 703 seq_printf(m, "%Lu ", totals.bytes[i]); 704 #ifdef CONFIG_NFS_FSCACHE 705 if (nfss->options & NFS_OPTION_FSCACHE) { 706 seq_puts(m, "\n\tfsc:\t"); 707 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 708 seq_printf(m, "%Lu ", totals.fscache[i]); 709 } 710 #endif 711 seq_putc(m, '\n'); 712 713 rpc_clnt_show_stats(m, nfss->client); 714 715 return 0; 716 } 717 EXPORT_SYMBOL_GPL(nfs_show_stats); 718 719 /* 720 * Begin unmount by attempting to remove all automounted mountpoints we added 721 * in response to xdev traversals and referrals 722 */ 723 void nfs_umount_begin(struct super_block *sb) 724 { 725 struct nfs_server *server; 726 struct rpc_clnt *rpc; 727 728 server = NFS_SB(sb); 729 /* -EIO all pending I/O */ 730 rpc = server->client_acl; 731 if (!IS_ERR(rpc)) 732 rpc_killall_tasks(rpc); 733 rpc = server->client; 734 if (!IS_ERR(rpc)) 735 rpc_killall_tasks(rpc); 736 } 737 EXPORT_SYMBOL_GPL(nfs_umount_begin); 738 739 /* 740 * Return true if 'match' is in auth_info or auth_info is empty. 741 * Return false otherwise. 742 */ 743 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 744 rpc_authflavor_t match) 745 { 746 int i; 747 748 if (!auth_info->flavor_len) 749 return true; 750 751 for (i = 0; i < auth_info->flavor_len; i++) { 752 if (auth_info->flavors[i] == match) 753 return true; 754 } 755 return false; 756 } 757 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 758 759 /* 760 * Ensure that a specified authtype in ctx->auth_info is supported by 761 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and 762 * -EACCES if not. 763 */ 764 static int nfs_verify_authflavors(struct nfs_fs_context *ctx, 765 rpc_authflavor_t *server_authlist, 766 unsigned int count) 767 { 768 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 769 bool found_auth_null = false; 770 unsigned int i; 771 772 /* 773 * If the sec= mount option is used, the specified flavor or AUTH_NULL 774 * must be in the list returned by the server. 775 * 776 * AUTH_NULL has a special meaning when it's in the server list - it 777 * means that the server will ignore the rpc creds, so any flavor 778 * can be used but still use the sec= that was specified. 779 * 780 * Note also that the MNT procedure in MNTv1 does not return a list 781 * of supported security flavors. In this case, nfs_mount() fabricates 782 * a security flavor list containing just AUTH_NULL. 783 */ 784 for (i = 0; i < count; i++) { 785 flavor = server_authlist[i]; 786 787 if (nfs_auth_info_match(&ctx->auth_info, flavor)) 788 goto out; 789 790 if (flavor == RPC_AUTH_NULL) 791 found_auth_null = true; 792 } 793 794 if (found_auth_null) { 795 flavor = ctx->auth_info.flavors[0]; 796 goto out; 797 } 798 799 dfprintk(MOUNT, 800 "NFS: specified auth flavors not supported by server\n"); 801 return -EACCES; 802 803 out: 804 ctx->selected_flavor = flavor; 805 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); 806 return 0; 807 } 808 809 /* 810 * Use the remote server's MOUNT service to request the NFS file handle 811 * corresponding to the provided path. 812 */ 813 static int nfs_request_mount(struct fs_context *fc, 814 struct nfs_fh *root_fh, 815 rpc_authflavor_t *server_authlist, 816 unsigned int *server_authlist_len) 817 { 818 struct nfs_fs_context *ctx = nfs_fc2context(fc); 819 struct nfs_mount_request request = { 820 .sap = (struct sockaddr *) 821 &ctx->mount_server.address, 822 .dirpath = ctx->nfs_server.export_path, 823 .protocol = ctx->mount_server.protocol, 824 .fh = root_fh, 825 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, 826 .auth_flav_len = server_authlist_len, 827 .auth_flavs = server_authlist, 828 .net = fc->net_ns, 829 }; 830 int status; 831 832 if (ctx->mount_server.version == 0) { 833 switch (ctx->version) { 834 default: 835 ctx->mount_server.version = NFS_MNT3_VERSION; 836 break; 837 case 2: 838 ctx->mount_server.version = NFS_MNT_VERSION; 839 } 840 } 841 request.version = ctx->mount_server.version; 842 843 if (ctx->mount_server.hostname) 844 request.hostname = ctx->mount_server.hostname; 845 else 846 request.hostname = ctx->nfs_server.hostname; 847 848 /* 849 * Construct the mount server's address. 850 */ 851 if (ctx->mount_server.address.sa_family == AF_UNSPEC) { 852 memcpy(request.sap, &ctx->nfs_server.address, 853 ctx->nfs_server.addrlen); 854 ctx->mount_server.addrlen = ctx->nfs_server.addrlen; 855 } 856 request.salen = ctx->mount_server.addrlen; 857 nfs_set_port(request.sap, &ctx->mount_server.port, 0); 858 859 /* 860 * Now ask the mount server to map our export path 861 * to a file handle. 862 */ 863 status = nfs_mount(&request); 864 if (status != 0) { 865 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 866 request.hostname, status); 867 return status; 868 } 869 870 return 0; 871 } 872 873 static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) 874 { 875 struct nfs_fs_context *ctx = nfs_fc2context(fc); 876 int status; 877 unsigned int i; 878 bool tried_auth_unix = false; 879 bool auth_null_in_list = false; 880 struct nfs_server *server = ERR_PTR(-EACCES); 881 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 882 unsigned int authlist_len = ARRAY_SIZE(authlist); 883 884 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); 885 if (status) 886 return ERR_PTR(status); 887 888 /* 889 * Was a sec= authflavor specified in the options? First, verify 890 * whether the server supports it, and then just try to use it if so. 891 */ 892 if (ctx->auth_info.flavor_len > 0) { 893 status = nfs_verify_authflavors(ctx, authlist, authlist_len); 894 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 895 ctx->selected_flavor); 896 if (status) 897 return ERR_PTR(status); 898 return ctx->nfs_mod->rpc_ops->create_server(fc); 899 } 900 901 /* 902 * No sec= option was provided. RFC 2623, section 2.7 suggests we 903 * SHOULD prefer the flavor listed first. However, some servers list 904 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 905 */ 906 for (i = 0; i < authlist_len; ++i) { 907 rpc_authflavor_t flavor; 908 struct rpcsec_gss_info info; 909 910 flavor = authlist[i]; 911 switch (flavor) { 912 case RPC_AUTH_UNIX: 913 tried_auth_unix = true; 914 break; 915 case RPC_AUTH_NULL: 916 auth_null_in_list = true; 917 continue; 918 default: 919 if (rpcauth_get_gssinfo(flavor, &info) != 0) 920 continue; 921 break; 922 } 923 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 924 ctx->selected_flavor = flavor; 925 server = ctx->nfs_mod->rpc_ops->create_server(fc); 926 if (!IS_ERR(server)) 927 return server; 928 } 929 930 /* 931 * Nothing we tried so far worked. At this point, give up if we've 932 * already tried AUTH_UNIX or if the server's list doesn't contain 933 * AUTH_NULL 934 */ 935 if (tried_auth_unix || !auth_null_in_list) 936 return server; 937 938 /* Last chance! Try AUTH_UNIX */ 939 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 940 ctx->selected_flavor = RPC_AUTH_UNIX; 941 return ctx->nfs_mod->rpc_ops->create_server(fc); 942 } 943 944 int nfs_try_get_tree(struct fs_context *fc) 945 { 946 struct nfs_fs_context *ctx = nfs_fc2context(fc); 947 948 if (ctx->need_mount) 949 ctx->server = nfs_try_mount_request(fc); 950 else 951 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); 952 953 return nfs_get_tree_common(fc); 954 } 955 EXPORT_SYMBOL_GPL(nfs_try_get_tree); 956 957 958 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 959 | NFS_MOUNT_SECURE \ 960 | NFS_MOUNT_TCP \ 961 | NFS_MOUNT_VER3 \ 962 | NFS_MOUNT_KERBEROS \ 963 | NFS_MOUNT_NONLM \ 964 | NFS_MOUNT_BROKEN_SUID \ 965 | NFS_MOUNT_STRICTLOCK \ 966 | NFS_MOUNT_LEGACY_INTERFACE) 967 968 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 969 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 970 971 static int 972 nfs_compare_remount_data(struct nfs_server *nfss, 973 struct nfs_fs_context *ctx) 974 { 975 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 976 ctx->rsize != nfss->rsize || 977 ctx->wsize != nfss->wsize || 978 ctx->version != nfss->nfs_client->rpc_ops->version || 979 ctx->minorversion != nfss->nfs_client->cl_minorversion || 980 ctx->retrans != nfss->client->cl_timeout->to_retries || 981 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || 982 ctx->acregmin != nfss->acregmin / HZ || 983 ctx->acregmax != nfss->acregmax / HZ || 984 ctx->acdirmin != nfss->acdirmin / HZ || 985 ctx->acdirmax != nfss->acdirmax / HZ || 986 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 987 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || 988 ctx->nfs_server.port != nfss->port || 989 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 990 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, 991 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 992 return -EINVAL; 993 994 return 0; 995 } 996 997 int nfs_reconfigure(struct fs_context *fc) 998 { 999 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1000 struct super_block *sb = fc->root->d_sb; 1001 struct nfs_server *nfss = sb->s_fs_info; 1002 1003 sync_filesystem(sb); 1004 1005 /* 1006 * Userspace mount programs that send binary options generally send 1007 * them populated with default values. We have no way to know which 1008 * ones were explicitly specified. Fall back to legacy behavior and 1009 * just return success. 1010 */ 1011 if (ctx->skip_reconfig_option_check) 1012 return 0; 1013 1014 /* 1015 * noac is a special case. It implies -o sync, but that's not 1016 * necessarily reflected in the mtab options. reconfigure_super 1017 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 1018 * remount options, so we have to explicitly reset it. 1019 */ 1020 if (ctx->flags & NFS_MOUNT_NOAC) { 1021 fc->sb_flags |= SB_SYNCHRONOUS; 1022 fc->sb_flags_mask |= SB_SYNCHRONOUS; 1023 } 1024 1025 /* compare new mount options with old ones */ 1026 return nfs_compare_remount_data(nfss, ctx); 1027 } 1028 EXPORT_SYMBOL_GPL(nfs_reconfigure); 1029 1030 /* 1031 * Finish setting up an NFS superblock 1032 */ 1033 static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 1034 { 1035 struct nfs_server *server = NFS_SB(sb); 1036 1037 sb->s_blocksize_bits = 0; 1038 sb->s_blocksize = 0; 1039 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 1040 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 1041 if (ctx && ctx->bsize) 1042 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); 1043 1044 if (server->nfs_client->rpc_ops->version != 2) { 1045 /* The VFS shouldn't apply the umask to mode bits. We will do 1046 * so ourselves when necessary. 1047 */ 1048 sb->s_flags |= SB_POSIXACL; 1049 sb->s_time_gran = 1; 1050 sb->s_export_op = &nfs_export_ops; 1051 } else 1052 sb->s_time_gran = 1000; 1053 1054 if (server->nfs_client->rpc_ops->version != 4) { 1055 sb->s_time_min = 0; 1056 sb->s_time_max = U32_MAX; 1057 } else { 1058 sb->s_time_min = S64_MIN; 1059 sb->s_time_max = S64_MAX; 1060 } 1061 1062 sb->s_magic = NFS_SUPER_MAGIC; 1063 1064 /* We probably want something more informative here */ 1065 snprintf(sb->s_id, sizeof(sb->s_id), 1066 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1067 1068 if (sb->s_blocksize == 0) 1069 sb->s_blocksize = nfs_block_bits(server->wsize, 1070 &sb->s_blocksize_bits); 1071 1072 nfs_super_set_maxbytes(sb, server->maxfilesize); 1073 } 1074 1075 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, 1076 const struct fs_context *fc) 1077 { 1078 const struct nfs_server *a = s->s_fs_info; 1079 const struct rpc_clnt *clnt_a = a->client; 1080 const struct rpc_clnt *clnt_b = b->client; 1081 1082 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) 1083 goto Ebusy; 1084 if (a->nfs_client != b->nfs_client) 1085 goto Ebusy; 1086 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 1087 goto Ebusy; 1088 if (a->wsize != b->wsize) 1089 goto Ebusy; 1090 if (a->rsize != b->rsize) 1091 goto Ebusy; 1092 if (a->acregmin != b->acregmin) 1093 goto Ebusy; 1094 if (a->acregmax != b->acregmax) 1095 goto Ebusy; 1096 if (a->acdirmin != b->acdirmin) 1097 goto Ebusy; 1098 if (a->acdirmax != b->acdirmax) 1099 goto Ebusy; 1100 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1101 goto Ebusy; 1102 return 1; 1103 Ebusy: 1104 return 0; 1105 } 1106 1107 static int nfs_set_super(struct super_block *s, struct fs_context *fc) 1108 { 1109 struct nfs_server *server = fc->s_fs_info; 1110 int ret; 1111 1112 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 1113 ret = set_anon_super(s, server); 1114 if (ret == 0) 1115 server->s_dev = s->s_dev; 1116 return ret; 1117 } 1118 1119 static int nfs_compare_super_address(struct nfs_server *server1, 1120 struct nfs_server *server2) 1121 { 1122 struct sockaddr *sap1, *sap2; 1123 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 1124 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 1125 1126 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 1127 return 0; 1128 1129 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1130 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1131 1132 if (sap1->sa_family != sap2->sa_family) 1133 return 0; 1134 1135 switch (sap1->sa_family) { 1136 case AF_INET: { 1137 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1138 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1139 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1140 return 0; 1141 if (sin1->sin_port != sin2->sin_port) 1142 return 0; 1143 break; 1144 } 1145 case AF_INET6: { 1146 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1147 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1148 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1149 return 0; 1150 if (sin1->sin6_port != sin2->sin6_port) 1151 return 0; 1152 break; 1153 } 1154 default: 1155 return 0; 1156 } 1157 1158 return 1; 1159 } 1160 1161 static int nfs_compare_userns(const struct nfs_server *old, 1162 const struct nfs_server *new) 1163 { 1164 const struct user_namespace *oldns = &init_user_ns; 1165 const struct user_namespace *newns = &init_user_ns; 1166 1167 if (old->client && old->client->cl_cred) 1168 oldns = old->client->cl_cred->user_ns; 1169 if (new->client && new->client->cl_cred) 1170 newns = new->client->cl_cred->user_ns; 1171 if (oldns != newns) 1172 return 0; 1173 return 1; 1174 } 1175 1176 static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) 1177 { 1178 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); 1179 1180 if (!nfs_compare_super_address(old, server)) 1181 return 0; 1182 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1183 if (old->flags & NFS_MOUNT_UNSHARED) 1184 return 0; 1185 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1186 return 0; 1187 if (!nfs_compare_userns(old, server)) 1188 return 0; 1189 return nfs_compare_mount_options(sb, server, fc); 1190 } 1191 1192 #ifdef CONFIG_NFS_FSCACHE 1193 static void nfs_get_cache_cookie(struct super_block *sb, 1194 struct nfs_fs_context *ctx) 1195 { 1196 struct nfs_server *nfss = NFS_SB(sb); 1197 char *uniq = NULL; 1198 int ulen = 0; 1199 1200 nfss->fscache_key = NULL; 1201 nfss->fscache = NULL; 1202 1203 if (!ctx) 1204 return; 1205 1206 if (ctx->clone_data.sb) { 1207 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); 1208 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 1209 return; 1210 if (mnt_s->fscache_key) { 1211 uniq = mnt_s->fscache_key->key.uniquifier; 1212 ulen = mnt_s->fscache_key->key.uniq_len; 1213 } 1214 } else { 1215 if (!(ctx->options & NFS_OPTION_FSCACHE)) 1216 return; 1217 if (ctx->fscache_uniq) { 1218 uniq = ctx->fscache_uniq; 1219 ulen = strlen(ctx->fscache_uniq); 1220 } 1221 } 1222 1223 nfs_fscache_get_super_cookie(sb, uniq, ulen); 1224 } 1225 #else 1226 static void nfs_get_cache_cookie(struct super_block *sb, 1227 struct nfs_fs_context *ctx) 1228 { 1229 } 1230 #endif 1231 1232 int nfs_get_tree_common(struct fs_context *fc) 1233 { 1234 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1235 struct super_block *s; 1236 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; 1237 struct nfs_server *server = ctx->server; 1238 int error; 1239 1240 ctx->server = NULL; 1241 if (IS_ERR(server)) 1242 return PTR_ERR(server); 1243 1244 if (server->flags & NFS_MOUNT_UNSHARED) 1245 compare_super = NULL; 1246 1247 /* -o noac implies -o sync */ 1248 if (server->flags & NFS_MOUNT_NOAC) 1249 fc->sb_flags |= SB_SYNCHRONOUS; 1250 1251 if (ctx->clone_data.sb) 1252 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) 1253 fc->sb_flags |= SB_SYNCHRONOUS; 1254 1255 if (server->caps & NFS_CAP_SECURITY_LABEL) 1256 fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS; 1257 1258 /* Get a superblock - note that we may end up sharing one that already exists */ 1259 fc->s_fs_info = server; 1260 s = sget_fc(fc, compare_super, nfs_set_super); 1261 fc->s_fs_info = NULL; 1262 if (IS_ERR(s)) { 1263 error = PTR_ERR(s); 1264 nfs_errorf(fc, "NFS: Couldn't get superblock"); 1265 goto out_err_nosb; 1266 } 1267 1268 if (s->s_fs_info != server) { 1269 nfs_free_server(server); 1270 server = NULL; 1271 } else { 1272 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 1273 MINOR(server->s_dev)); 1274 if (error) 1275 goto error_splat_super; 1276 s->s_bdi->io_pages = server->rpages; 1277 server->super = s; 1278 } 1279 1280 if (!s->s_root) { 1281 unsigned bsize = ctx->clone_data.inherited_bsize; 1282 /* initial superblock/root creation */ 1283 nfs_fill_super(s, ctx); 1284 if (bsize) { 1285 s->s_blocksize_bits = bsize; 1286 s->s_blocksize = 1U << bsize; 1287 } 1288 nfs_get_cache_cookie(s, ctx); 1289 } 1290 1291 error = nfs_get_root(s, fc); 1292 if (error < 0) { 1293 nfs_errorf(fc, "NFS: Couldn't get root dentry"); 1294 goto error_splat_super; 1295 } 1296 1297 s->s_flags |= SB_ACTIVE; 1298 error = 0; 1299 1300 out: 1301 return error; 1302 1303 out_err_nosb: 1304 nfs_free_server(server); 1305 goto out; 1306 error_splat_super: 1307 deactivate_locked_super(s); 1308 goto out; 1309 } 1310 1311 /* 1312 * Destroy an NFS2/3 superblock 1313 */ 1314 void nfs_kill_super(struct super_block *s) 1315 { 1316 struct nfs_server *server = NFS_SB(s); 1317 dev_t dev = s->s_dev; 1318 1319 generic_shutdown_super(s); 1320 1321 nfs_fscache_release_super_cookie(s); 1322 1323 nfs_free_server(server); 1324 free_anon_bdev(dev); 1325 } 1326 EXPORT_SYMBOL_GPL(nfs_kill_super); 1327 1328 #if IS_ENABLED(CONFIG_NFS_V4) 1329 1330 /* 1331 * NFS v4 module parameters need to stay in the 1332 * NFS client for backwards compatibility 1333 */ 1334 unsigned int nfs_callback_set_tcpport; 1335 unsigned short nfs_callback_nr_threads; 1336 /* Default cache timeout is 10 minutes */ 1337 unsigned int nfs_idmap_cache_timeout = 600; 1338 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 1339 bool nfs4_disable_idmapping = true; 1340 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 1341 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 1342 unsigned short send_implementation_id = 1; 1343 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 1344 bool recover_lost_locks = false; 1345 1346 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 1347 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 1348 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 1349 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 1350 EXPORT_SYMBOL_GPL(max_session_slots); 1351 EXPORT_SYMBOL_GPL(max_session_cb_slots); 1352 EXPORT_SYMBOL_GPL(send_implementation_id); 1353 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 1354 EXPORT_SYMBOL_GPL(recover_lost_locks); 1355 1356 #define NFS_CALLBACK_MAXPORTNR (65535U) 1357 1358 static int param_set_portnr(const char *val, const struct kernel_param *kp) 1359 { 1360 unsigned long num; 1361 int ret; 1362 1363 if (!val) 1364 return -EINVAL; 1365 ret = kstrtoul(val, 0, &num); 1366 if (ret || num > NFS_CALLBACK_MAXPORTNR) 1367 return -EINVAL; 1368 *((unsigned int *)kp->arg) = num; 1369 return 0; 1370 } 1371 static const struct kernel_param_ops param_ops_portnr = { 1372 .set = param_set_portnr, 1373 .get = param_get_uint, 1374 }; 1375 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 1376 1377 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 1378 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 1379 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 1380 "assigned to the NFSv4 callback channels."); 1381 module_param(nfs_idmap_cache_timeout, int, 0644); 1382 module_param(nfs4_disable_idmapping, bool, 0644); 1383 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 1384 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 1385 MODULE_PARM_DESC(nfs4_disable_idmapping, 1386 "Turn off NFSv4 idmapping when using 'sec=sys'"); 1387 module_param(max_session_slots, ushort, 0644); 1388 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 1389 "requests the client will negotiate"); 1390 module_param(max_session_cb_slots, ushort, 0644); 1391 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 1392 "callbacks the client will process for a given server"); 1393 module_param(send_implementation_id, ushort, 0644); 1394 MODULE_PARM_DESC(send_implementation_id, 1395 "Send implementation ID with NFSv4.1 exchange_id"); 1396 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 1397 1398 module_param(recover_lost_locks, bool, 0644); 1399 MODULE_PARM_DESC(recover_lost_locks, 1400 "If the server reports that a lock might be lost, " 1401 "try to recover it risking data corruption."); 1402 1403 1404 #endif /* CONFIG_NFS_V4 */ 1405