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