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/sched.h> 51 #include <linux/slab.h> 52 #include <net/ipv6.h> 53 #include <linux/netdevice.h> 54 #include <linux/nfs_xdr.h> 55 #include <linux/magic.h> 56 #include <linux/parser.h> 57 #include <linux/nsproxy.h> 58 #include <linux/rcupdate.h> 59 60 #include <linux/uaccess.h> 61 #include <linux/nfs_ssc.h> 62 63 #include <uapi/linux/tls.h> 64 65 #include "nfs4_fs.h" 66 #include "callback.h" 67 #include "delegation.h" 68 #include "iostat.h" 69 #include "internal.h" 70 #include "fscache.h" 71 #include "nfs4session.h" 72 #include "pnfs.h" 73 #include "nfs.h" 74 #include "netns.h" 75 #include "sysfs.h" 76 #include "nfs4idmap.h" 77 78 #define NFSDBG_FACILITY NFSDBG_VFS 79 80 const struct super_operations nfs_sops = { 81 .alloc_inode = nfs_alloc_inode, 82 .free_inode = nfs_free_inode, 83 .write_inode = nfs_write_inode, 84 .drop_inode = nfs_drop_inode, 85 .statfs = nfs_statfs, 86 .evict_inode = nfs_evict_inode, 87 .umount_begin = nfs_umount_begin, 88 .show_options = nfs_show_options, 89 .show_devname = nfs_show_devname, 90 .show_path = nfs_show_path, 91 .show_stats = nfs_show_stats, 92 }; 93 EXPORT_SYMBOL_GPL(nfs_sops); 94 95 #ifdef CONFIG_NFS_V4_2 96 static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { 97 .sco_sb_deactive = nfs_sb_deactive, 98 }; 99 #endif 100 101 #if IS_ENABLED(CONFIG_NFS_V4) 102 static int __init register_nfs4_fs(void) 103 { 104 return register_filesystem(&nfs4_fs_type); 105 } 106 107 static void unregister_nfs4_fs(void) 108 { 109 unregister_filesystem(&nfs4_fs_type); 110 } 111 #else 112 static int __init register_nfs4_fs(void) 113 { 114 return 0; 115 } 116 117 static void unregister_nfs4_fs(void) 118 { 119 } 120 #endif 121 122 #ifdef CONFIG_NFS_V4_2 123 static void nfs_ssc_register_ops(void) 124 { 125 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); 126 } 127 128 static void nfs_ssc_unregister_ops(void) 129 { 130 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); 131 } 132 #endif /* CONFIG_NFS_V4_2 */ 133 134 static struct shrinker *acl_shrinker; 135 136 /* 137 * Register the NFS filesystems 138 */ 139 int __init register_nfs_fs(void) 140 { 141 int ret; 142 143 ret = register_filesystem(&nfs_fs_type); 144 if (ret < 0) 145 goto error_0; 146 147 ret = register_nfs4_fs(); 148 if (ret < 0) 149 goto error_1; 150 151 ret = nfs_register_sysctl(); 152 if (ret < 0) 153 goto error_2; 154 155 acl_shrinker = shrinker_alloc(0, "nfs-acl"); 156 if (!acl_shrinker) { 157 ret = -ENOMEM; 158 goto error_3; 159 } 160 161 acl_shrinker->count_objects = nfs_access_cache_count; 162 acl_shrinker->scan_objects = nfs_access_cache_scan; 163 164 shrinker_register(acl_shrinker); 165 166 #ifdef CONFIG_NFS_V4_2 167 nfs_ssc_register_ops(); 168 #endif 169 return 0; 170 error_3: 171 nfs_unregister_sysctl(); 172 error_2: 173 unregister_nfs4_fs(); 174 error_1: 175 unregister_filesystem(&nfs_fs_type); 176 error_0: 177 return ret; 178 } 179 180 /* 181 * Unregister the NFS filesystems 182 */ 183 void __exit unregister_nfs_fs(void) 184 { 185 shrinker_free(acl_shrinker); 186 nfs_unregister_sysctl(); 187 unregister_nfs4_fs(); 188 #ifdef CONFIG_NFS_V4_2 189 nfs_ssc_unregister_ops(); 190 #endif 191 unregister_filesystem(&nfs_fs_type); 192 } 193 194 bool nfs_sb_active(struct super_block *sb) 195 { 196 struct nfs_server *server = NFS_SB(sb); 197 198 if (!atomic_inc_not_zero(&sb->s_active)) 199 return false; 200 if (atomic_inc_return(&server->active) != 1) 201 atomic_dec(&sb->s_active); 202 return true; 203 } 204 EXPORT_SYMBOL_GPL(nfs_sb_active); 205 206 void nfs_sb_deactive(struct super_block *sb) 207 { 208 struct nfs_server *server = NFS_SB(sb); 209 210 if (atomic_dec_and_test(&server->active)) 211 deactivate_super(sb); 212 } 213 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 214 215 int nfs_client_for_each_server(struct nfs_client *clp, 216 int (*fn)(struct nfs_server *server, void *data), void *data) 217 { 218 struct nfs_server *server, *last = NULL; 219 int ret = 0; 220 221 rcu_read_lock(); 222 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 223 if (!(server->super && nfs_sb_active(server->super))) 224 continue; 225 rcu_read_unlock(); 226 if (last) 227 nfs_sb_deactive(last->super); 228 last = server; 229 ret = fn(server, data); 230 if (ret) 231 goto out; 232 cond_resched(); 233 rcu_read_lock(); 234 } 235 rcu_read_unlock(); 236 out: 237 if (last) 238 nfs_sb_deactive(last->super); 239 return ret; 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_FORCE_RDIRPLUS, ",rdirplus=force", "" }, 450 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 451 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 452 { NFS_MOUNT_NETUNREACH_FATAL, 453 ",fatal_neterrors=ENETDOWN:ENETUNREACH", 454 ",fatal_neterrors=none" }, 455 { 0, NULL, NULL } 456 }; 457 const struct proc_nfs_info *nfs_infop; 458 struct nfs_client *clp = nfss->nfs_client; 459 u32 version = clp->rpc_ops->version; 460 int local_flock, local_fcntl; 461 462 nfs_show_nfs_version(m, version, clp->cl_minorversion); 463 seq_printf(m, ",rsize=%u", nfss->rsize); 464 seq_printf(m, ",wsize=%u", nfss->wsize); 465 if (nfss->bsize != 0) 466 seq_printf(m, ",bsize=%u", nfss->bsize); 467 seq_printf(m, ",namlen=%u", nfss->namelen); 468 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 469 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 470 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 471 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 472 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 473 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 474 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 475 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 476 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 477 seq_puts(m, ",hard"); 478 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 479 if (nfss->flags & nfs_infop->flag) 480 seq_puts(m, nfs_infop->str); 481 else 482 seq_puts(m, nfs_infop->nostr); 483 } 484 rcu_read_lock(); 485 seq_printf(m, ",proto=%s", 486 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 487 rcu_read_unlock(); 488 if (clp->cl_nconnect > 0) 489 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 490 if (version == 4) { 491 if (clp->cl_max_connect > 1) 492 seq_printf(m, ",max_connect=%u", clp->cl_max_connect); 493 if (nfss->port != NFS_PORT) 494 seq_printf(m, ",port=%u", nfss->port); 495 } else 496 if (nfss->port) 497 seq_printf(m, ",port=%u", nfss->port); 498 499 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 500 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 501 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 502 switch (clp->cl_xprtsec.policy) { 503 case RPC_XPRTSEC_TLS_ANON: 504 seq_puts(m, ",xprtsec=tls"); 505 break; 506 case RPC_XPRTSEC_TLS_X509: 507 seq_puts(m, ",xprtsec=mtls"); 508 break; 509 default: 510 break; 511 } 512 513 if (version != 4) 514 nfs_show_mountd_options(m, nfss, showdefaults); 515 else 516 nfs_show_nfsv4_options(m, nfss, showdefaults); 517 518 if (nfss->options & NFS_OPTION_FSCACHE) { 519 #ifdef CONFIG_NFS_FSCACHE 520 if (nfss->fscache_uniq) 521 seq_printf(m, ",fsc=%s", nfss->fscache_uniq); 522 else 523 seq_puts(m, ",fsc"); 524 #else 525 seq_puts(m, ",fsc"); 526 #endif 527 } 528 529 if (nfss->options & NFS_OPTION_MIGRATION) 530 seq_puts(m, ",migration"); 531 532 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 533 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 534 seq_puts(m, ",lookupcache=none"); 535 else 536 seq_puts(m, ",lookupcache=pos"); 537 } 538 539 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 540 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 541 542 if (!local_flock && !local_fcntl) 543 seq_puts(m, ",local_lock=none"); 544 else if (local_flock && local_fcntl) 545 seq_puts(m, ",local_lock=all"); 546 else if (local_flock) 547 seq_puts(m, ",local_lock=flock"); 548 else 549 seq_puts(m, ",local_lock=posix"); 550 551 if (nfss->flags & NFS_MOUNT_NO_ALIGNWRITE) 552 seq_puts(m, ",noalignwrite"); 553 554 if (nfss->flags & NFS_MOUNT_WRITE_EAGER) { 555 if (nfss->flags & NFS_MOUNT_WRITE_WAIT) 556 seq_puts(m, ",write=wait"); 557 else 558 seq_puts(m, ",write=eager"); 559 } 560 } 561 562 /* 563 * Describe the mount options on this VFS mountpoint 564 */ 565 int nfs_show_options(struct seq_file *m, struct dentry *root) 566 { 567 struct nfs_server *nfss = NFS_SB(root->d_sb); 568 569 nfs_show_mount_options(m, nfss, 0); 570 571 rcu_read_lock(); 572 seq_printf(m, ",addr=%s", 573 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 574 RPC_DISPLAY_ADDR)); 575 rcu_read_unlock(); 576 577 return 0; 578 } 579 EXPORT_SYMBOL_GPL(nfs_show_options); 580 581 #if IS_ENABLED(CONFIG_NFS_V4) 582 static void show_lease(struct seq_file *m, struct nfs_server *server) 583 { 584 struct nfs_client *clp = server->nfs_client; 585 unsigned long expire; 586 587 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 588 expire = clp->cl_last_renewal + clp->cl_lease_time; 589 seq_printf(m, ",lease_expired=%ld", 590 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 591 } 592 593 static void show_sessions(struct seq_file *m, struct nfs_server *server) 594 { 595 if (nfs4_has_session(server->nfs_client)) 596 seq_puts(m, ",sessions"); 597 } 598 599 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 600 { 601 seq_printf(m, ",pnfs="); 602 if (server->pnfs_curr_ld) 603 seq_printf(m, "%s", server->pnfs_curr_ld->name); 604 else 605 seq_printf(m, "not configured"); 606 } 607 608 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 609 { 610 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 611 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 612 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 613 "date='%llu,%u'", 614 impl_id->name, impl_id->domain, 615 impl_id->date.seconds, impl_id->date.nseconds); 616 } 617 } 618 #else /* CONFIG_NFS_V4 */ 619 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 620 { 621 } 622 #endif /* CONFIG_NFS_V4 */ 623 624 int nfs_show_devname(struct seq_file *m, struct dentry *root) 625 { 626 char *page = (char *) __get_free_page(GFP_KERNEL); 627 char *devname, *dummy; 628 int err = 0; 629 if (!page) 630 return -ENOMEM; 631 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 632 if (IS_ERR(devname)) 633 err = PTR_ERR(devname); 634 else 635 seq_escape(m, devname, " \t\n\\"); 636 free_page((unsigned long)page); 637 return err; 638 } 639 EXPORT_SYMBOL_GPL(nfs_show_devname); 640 641 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 642 { 643 seq_puts(m, "/"); 644 return 0; 645 } 646 EXPORT_SYMBOL_GPL(nfs_show_path); 647 648 /* 649 * Present statistical information for this VFS mountpoint 650 */ 651 int nfs_show_stats(struct seq_file *m, struct dentry *root) 652 { 653 int i, cpu; 654 struct nfs_server *nfss = NFS_SB(root->d_sb); 655 struct rpc_auth *auth = nfss->client->cl_auth; 656 struct nfs_iostats totals = { }; 657 658 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 659 660 /* 661 * Display all mount option settings 662 */ 663 seq_puts(m, "\n\topts:\t"); 664 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 665 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 666 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 667 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 668 nfs_show_mount_options(m, nfss, 1); 669 670 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 671 672 show_implementation_id(m, nfss); 673 674 seq_puts(m, "\n\tcaps:\t"); 675 seq_printf(m, "caps=0x%x", nfss->caps); 676 seq_printf(m, ",wtmult=%u", nfss->wtmult); 677 seq_printf(m, ",dtsize=%u", nfss->dtsize); 678 seq_printf(m, ",bsize=%u", nfss->bsize); 679 seq_printf(m, ",namlen=%u", nfss->namelen); 680 681 #if IS_ENABLED(CONFIG_NFS_V4) 682 if (nfss->nfs_client->rpc_ops->version == 4) { 683 seq_puts(m, "\n\tnfsv4:\t"); 684 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 685 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 686 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 687 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 688 show_sessions(m, nfss); 689 show_pnfs(m, nfss); 690 show_lease(m, nfss); 691 } 692 #endif 693 694 /* 695 * Display security flavor in effect for this mount 696 */ 697 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 698 if (auth->au_flavor) 699 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 700 701 /* 702 * Display superblock I/O counters 703 */ 704 for_each_possible_cpu(cpu) { 705 struct nfs_iostats *stats; 706 707 preempt_disable(); 708 stats = per_cpu_ptr(nfss->io_stats, cpu); 709 710 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 711 totals.events[i] += stats->events[i]; 712 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 713 totals.bytes[i] += stats->bytes[i]; 714 715 preempt_enable(); 716 } 717 718 seq_puts(m, "\n\tevents:\t"); 719 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 720 seq_printf(m, "%lu ", totals.events[i]); 721 seq_puts(m, "\n\tbytes:\t"); 722 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 723 seq_printf(m, "%Lu ", totals.bytes[i]); 724 seq_putc(m, '\n'); 725 726 rpc_clnt_show_stats(m, nfss->client); 727 728 return 0; 729 } 730 EXPORT_SYMBOL_GPL(nfs_show_stats); 731 732 /* 733 * Begin unmount by attempting to remove all automounted mountpoints we added 734 * in response to xdev traversals and referrals 735 */ 736 void nfs_umount_begin(struct super_block *sb) 737 { 738 struct nfs_server *server; 739 struct rpc_clnt *rpc; 740 741 server = NFS_SB(sb); 742 /* -EIO all pending I/O */ 743 rpc = server->client_acl; 744 if (!IS_ERR(rpc)) 745 rpc_killall_tasks(rpc); 746 rpc = server->client; 747 if (!IS_ERR(rpc)) 748 rpc_killall_tasks(rpc); 749 } 750 EXPORT_SYMBOL_GPL(nfs_umount_begin); 751 752 /* 753 * Return true if 'match' is in auth_info or auth_info is empty. 754 * Return false otherwise. 755 */ 756 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 757 rpc_authflavor_t match) 758 { 759 int i; 760 761 if (!auth_info->flavor_len) 762 return true; 763 764 for (i = 0; i < auth_info->flavor_len; i++) { 765 if (auth_info->flavors[i] == match) 766 return true; 767 } 768 return false; 769 } 770 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 771 772 /* 773 * Ensure that a specified authtype in ctx->auth_info is supported by 774 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and 775 * -EACCES if not. 776 */ 777 static int nfs_verify_authflavors(struct nfs_fs_context *ctx, 778 rpc_authflavor_t *server_authlist, 779 unsigned int count) 780 { 781 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 782 bool found_auth_null = false; 783 unsigned int i; 784 785 /* 786 * If the sec= mount option is used, the specified flavor or AUTH_NULL 787 * must be in the list returned by the server. 788 * 789 * AUTH_NULL has a special meaning when it's in the server list - it 790 * means that the server will ignore the rpc creds, so any flavor 791 * can be used but still use the sec= that was specified. 792 * 793 * Note also that the MNT procedure in MNTv1 does not return a list 794 * of supported security flavors. In this case, nfs_mount() fabricates 795 * a security flavor list containing just AUTH_NULL. 796 */ 797 for (i = 0; i < count; i++) { 798 flavor = server_authlist[i]; 799 800 if (nfs_auth_info_match(&ctx->auth_info, flavor)) 801 goto out; 802 803 if (flavor == RPC_AUTH_NULL) 804 found_auth_null = true; 805 } 806 807 if (found_auth_null) { 808 flavor = ctx->auth_info.flavors[0]; 809 goto out; 810 } 811 812 dfprintk(MOUNT, 813 "NFS: specified auth flavors not supported by server\n"); 814 return -EACCES; 815 816 out: 817 ctx->selected_flavor = flavor; 818 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); 819 return 0; 820 } 821 822 /* 823 * Use the remote server's MOUNT service to request the NFS file handle 824 * corresponding to the provided path. 825 */ 826 static int nfs_request_mount(struct fs_context *fc, 827 struct nfs_fh *root_fh, 828 rpc_authflavor_t *server_authlist, 829 unsigned int *server_authlist_len) 830 { 831 struct nfs_fs_context *ctx = nfs_fc2context(fc); 832 struct nfs_mount_request request = { 833 .sap = &ctx->mount_server._address, 834 .dirpath = ctx->nfs_server.export_path, 835 .protocol = ctx->mount_server.protocol, 836 .fh = root_fh, 837 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, 838 .auth_flav_len = server_authlist_len, 839 .auth_flavs = server_authlist, 840 .net = fc->net_ns, 841 }; 842 int status; 843 844 if (ctx->mount_server.version == 0) { 845 switch (ctx->version) { 846 default: 847 ctx->mount_server.version = NFS_MNT3_VERSION; 848 break; 849 case 2: 850 ctx->mount_server.version = NFS_MNT_VERSION; 851 } 852 } 853 request.version = ctx->mount_server.version; 854 855 if (ctx->mount_server.hostname) 856 request.hostname = ctx->mount_server.hostname; 857 else 858 request.hostname = ctx->nfs_server.hostname; 859 860 /* 861 * Construct the mount server's address. 862 */ 863 if (ctx->mount_server.address.sa_family == AF_UNSPEC) { 864 memcpy(request.sap, &ctx->nfs_server._address, 865 ctx->nfs_server.addrlen); 866 ctx->mount_server.addrlen = ctx->nfs_server.addrlen; 867 } 868 request.salen = ctx->mount_server.addrlen; 869 nfs_set_port(request.sap, &ctx->mount_server.port, 0); 870 871 /* 872 * Now ask the mount server to map our export path 873 * to a file handle. 874 */ 875 if ((request.protocol == XPRT_TRANSPORT_UDP) == 876 !(ctx->flags & NFS_MOUNT_TCP)) 877 /* 878 * NFS protocol and mount protocol are both UDP or neither UDP 879 * so timeouts are compatible. Use NFS timeouts for MOUNT 880 */ 881 status = nfs_mount(&request, ctx->timeo, ctx->retrans); 882 else 883 status = nfs_mount(&request, NFS_UNSPEC_TIMEO, NFS_UNSPEC_RETRANS); 884 if (status != 0) { 885 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 886 request.hostname, status); 887 return status; 888 } 889 890 return 0; 891 } 892 893 static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) 894 { 895 struct nfs_fs_context *ctx = nfs_fc2context(fc); 896 int status; 897 unsigned int i; 898 bool tried_auth_unix = false; 899 bool auth_null_in_list = false; 900 struct nfs_server *server = ERR_PTR(-EACCES); 901 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 902 unsigned int authlist_len = ARRAY_SIZE(authlist); 903 904 /* make sure 'nolock'/'lock' override the 'local_lock' mount option */ 905 if (ctx->lock_status) { 906 if (ctx->lock_status == NFS_LOCK_NOLOCK) { 907 ctx->flags |= NFS_MOUNT_NONLM; 908 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); 909 } else { 910 ctx->flags &= ~NFS_MOUNT_NONLM; 911 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); 912 } 913 } 914 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); 915 if (status) 916 return ERR_PTR(status); 917 918 /* 919 * Was a sec= authflavor specified in the options? First, verify 920 * whether the server supports it, and then just try to use it if so. 921 */ 922 if (ctx->auth_info.flavor_len > 0) { 923 status = nfs_verify_authflavors(ctx, authlist, authlist_len); 924 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 925 ctx->selected_flavor); 926 if (status) 927 return ERR_PTR(status); 928 return ctx->nfs_mod->rpc_ops->create_server(fc); 929 } 930 931 /* 932 * No sec= option was provided. RFC 2623, section 2.7 suggests we 933 * SHOULD prefer the flavor listed first. However, some servers list 934 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 935 */ 936 for (i = 0; i < authlist_len; ++i) { 937 rpc_authflavor_t flavor; 938 struct rpcsec_gss_info info; 939 940 flavor = authlist[i]; 941 switch (flavor) { 942 case RPC_AUTH_UNIX: 943 tried_auth_unix = true; 944 break; 945 case RPC_AUTH_NULL: 946 auth_null_in_list = true; 947 continue; 948 default: 949 if (rpcauth_get_gssinfo(flavor, &info) != 0) 950 continue; 951 break; 952 } 953 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 954 ctx->selected_flavor = flavor; 955 server = ctx->nfs_mod->rpc_ops->create_server(fc); 956 if (!IS_ERR(server)) 957 return server; 958 } 959 960 /* 961 * Nothing we tried so far worked. At this point, give up if we've 962 * already tried AUTH_UNIX or if the server's list doesn't contain 963 * AUTH_NULL 964 */ 965 if (tried_auth_unix || !auth_null_in_list) 966 return server; 967 968 /* Last chance! Try AUTH_UNIX */ 969 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 970 ctx->selected_flavor = RPC_AUTH_UNIX; 971 return ctx->nfs_mod->rpc_ops->create_server(fc); 972 } 973 974 int nfs_try_get_tree(struct fs_context *fc) 975 { 976 struct nfs_fs_context *ctx = nfs_fc2context(fc); 977 978 if (ctx->need_mount) 979 ctx->server = nfs_try_mount_request(fc); 980 else 981 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); 982 983 return nfs_get_tree_common(fc); 984 } 985 EXPORT_SYMBOL_GPL(nfs_try_get_tree); 986 987 988 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 989 | NFS_MOUNT_SECURE \ 990 | NFS_MOUNT_TCP \ 991 | NFS_MOUNT_VER3 \ 992 | NFS_MOUNT_KERBEROS \ 993 | NFS_MOUNT_NONLM \ 994 | NFS_MOUNT_BROKEN_SUID \ 995 | NFS_MOUNT_STRICTLOCK \ 996 | NFS_MOUNT_LEGACY_INTERFACE) 997 998 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 999 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 1000 1001 static int 1002 nfs_compare_remount_data(struct nfs_server *nfss, 1003 struct nfs_fs_context *ctx) 1004 { 1005 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 1006 ctx->rsize != nfss->rsize || 1007 ctx->wsize != nfss->wsize || 1008 ctx->version != nfss->nfs_client->rpc_ops->version || 1009 ctx->minorversion != nfss->nfs_client->cl_minorversion || 1010 ctx->retrans != nfss->client->cl_timeout->to_retries || 1011 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || 1012 ctx->acregmin != nfss->acregmin / HZ || 1013 ctx->acregmax != nfss->acregmax / HZ || 1014 ctx->acdirmin != nfss->acdirmin / HZ || 1015 ctx->acdirmax != nfss->acdirmax / HZ || 1016 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1017 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || 1018 ctx->nfs_server.port != nfss->port || 1019 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1020 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, 1021 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1022 return -EINVAL; 1023 1024 return 0; 1025 } 1026 1027 int nfs_reconfigure(struct fs_context *fc) 1028 { 1029 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1030 struct super_block *sb = fc->root->d_sb; 1031 struct nfs_server *nfss = sb->s_fs_info; 1032 int ret; 1033 1034 sync_filesystem(sb); 1035 1036 /* 1037 * Userspace mount programs that send binary options generally send 1038 * them populated with default values. We have no way to know which 1039 * ones were explicitly specified. Fall back to legacy behavior and 1040 * just return success. 1041 */ 1042 if (ctx->skip_reconfig_option_check) 1043 return 0; 1044 1045 /* 1046 * noac is a special case. It implies -o sync, but that's not 1047 * necessarily reflected in the mtab options. reconfigure_super 1048 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 1049 * remount options, so we have to explicitly reset it. 1050 */ 1051 if (ctx->flags & NFS_MOUNT_NOAC) { 1052 fc->sb_flags |= SB_SYNCHRONOUS; 1053 fc->sb_flags_mask |= SB_SYNCHRONOUS; 1054 } 1055 1056 /* compare new mount options with old ones */ 1057 ret = nfs_compare_remount_data(nfss, ctx); 1058 if (ret) 1059 return ret; 1060 1061 return nfs_probe_server(nfss, NFS_FH(d_inode(fc->root))); 1062 } 1063 EXPORT_SYMBOL_GPL(nfs_reconfigure); 1064 1065 /* 1066 * Finish setting up an NFS superblock 1067 */ 1068 static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 1069 { 1070 struct nfs_server *server = NFS_SB(sb); 1071 1072 sb->s_blocksize_bits = 0; 1073 sb->s_blocksize = 0; 1074 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 1075 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 1076 if (server->bsize) 1077 sb->s_blocksize = 1078 nfs_block_size(server->bsize, &sb->s_blocksize_bits); 1079 1080 switch (server->nfs_client->rpc_ops->version) { 1081 case 2: 1082 sb->s_time_gran = 1000; 1083 sb->s_time_min = 0; 1084 sb->s_time_max = U32_MAX; 1085 break; 1086 case 3: 1087 /* 1088 * The VFS shouldn't apply the umask to mode bits. 1089 * We will do so ourselves when necessary. 1090 */ 1091 sb->s_flags |= SB_POSIXACL; 1092 sb->s_time_gran = 1; 1093 sb->s_time_min = 0; 1094 sb->s_time_max = U32_MAX; 1095 sb->s_export_op = &nfs_export_ops; 1096 break; 1097 case 4: 1098 sb->s_iflags |= SB_I_NOUMASK; 1099 sb->s_time_gran = 1; 1100 sb->s_time_min = S64_MIN; 1101 sb->s_time_max = S64_MAX; 1102 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1103 sb->s_export_op = &nfs_export_ops; 1104 break; 1105 } 1106 1107 sb->s_magic = NFS_SUPER_MAGIC; 1108 1109 /* We probably want something more informative here */ 1110 snprintf(sb->s_id, sizeof(sb->s_id), 1111 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1112 1113 if (sb->s_blocksize == 0) 1114 sb->s_blocksize = nfs_block_bits(server->wsize, 1115 &sb->s_blocksize_bits); 1116 1117 nfs_super_set_maxbytes(sb, server->maxfilesize); 1118 nfs_sysfs_move_server_to_sb(sb); 1119 server->has_sec_mnt_opts = ctx->has_sec_mnt_opts; 1120 } 1121 1122 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, 1123 const struct fs_context *fc) 1124 { 1125 const struct nfs_server *a = s->s_fs_info; 1126 const struct rpc_clnt *clnt_a = a->client; 1127 const struct rpc_clnt *clnt_b = b->client; 1128 1129 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) 1130 goto Ebusy; 1131 if (a->nfs_client != b->nfs_client) 1132 goto Ebusy; 1133 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 1134 goto Ebusy; 1135 if (a->wsize != b->wsize) 1136 goto Ebusy; 1137 if (a->rsize != b->rsize) 1138 goto Ebusy; 1139 if (a->acregmin != b->acregmin) 1140 goto Ebusy; 1141 if (a->acregmax != b->acregmax) 1142 goto Ebusy; 1143 if (a->acdirmin != b->acdirmin) 1144 goto Ebusy; 1145 if (a->acdirmax != b->acdirmax) 1146 goto Ebusy; 1147 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1148 goto Ebusy; 1149 return 1; 1150 Ebusy: 1151 return 0; 1152 } 1153 1154 static int nfs_set_super(struct super_block *s, struct fs_context *fc) 1155 { 1156 struct nfs_server *server = fc->s_fs_info; 1157 int ret; 1158 1159 set_default_d_op(s, server->nfs_client->rpc_ops->dentry_ops); 1160 ret = set_anon_super(s, server); 1161 if (ret == 0) 1162 server->s_dev = s->s_dev; 1163 return ret; 1164 } 1165 1166 static int nfs_compare_super_address(struct nfs_server *server1, 1167 struct nfs_server *server2) 1168 { 1169 struct sockaddr *sap1, *sap2; 1170 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 1171 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 1172 1173 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 1174 return 0; 1175 1176 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1177 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1178 1179 if (sap1->sa_family != sap2->sa_family) 1180 return 0; 1181 1182 switch (sap1->sa_family) { 1183 case AF_INET: { 1184 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1185 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1186 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1187 return 0; 1188 if (sin1->sin_port != sin2->sin_port) 1189 return 0; 1190 break; 1191 } 1192 case AF_INET6: { 1193 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1194 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1195 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1196 return 0; 1197 if (sin1->sin6_port != sin2->sin6_port) 1198 return 0; 1199 break; 1200 } 1201 default: 1202 return 0; 1203 } 1204 1205 return 1; 1206 } 1207 1208 static int nfs_compare_userns(const struct nfs_server *old, 1209 const struct nfs_server *new) 1210 { 1211 const struct user_namespace *oldns = &init_user_ns; 1212 const struct user_namespace *newns = &init_user_ns; 1213 1214 if (old->client && old->client->cl_cred) 1215 oldns = old->client->cl_cred->user_ns; 1216 if (new->client && new->client->cl_cred) 1217 newns = new->client->cl_cred->user_ns; 1218 if (oldns != newns) 1219 return 0; 1220 return 1; 1221 } 1222 1223 static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) 1224 { 1225 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); 1226 1227 if (!nfs_compare_super_address(old, server)) 1228 return 0; 1229 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1230 if (old->flags & NFS_MOUNT_UNSHARED) 1231 return 0; 1232 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1233 return 0; 1234 if (!nfs_compare_userns(old, server)) 1235 return 0; 1236 if ((old->has_sec_mnt_opts || fc->security) && 1237 security_sb_mnt_opts_compat(sb, fc->security)) 1238 return 0; 1239 return nfs_compare_mount_options(sb, server, fc); 1240 } 1241 1242 #ifdef CONFIG_NFS_FSCACHE 1243 static int nfs_get_cache_cookie(struct super_block *sb, 1244 struct nfs_fs_context *ctx) 1245 { 1246 struct nfs_server *nfss = NFS_SB(sb); 1247 char *uniq = NULL; 1248 int ulen = 0; 1249 1250 nfss->fscache = NULL; 1251 1252 if (!ctx) 1253 return 0; 1254 1255 if (ctx->clone_data.sb) { 1256 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); 1257 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 1258 return 0; 1259 if (mnt_s->fscache_uniq) { 1260 uniq = mnt_s->fscache_uniq; 1261 ulen = strlen(uniq); 1262 } 1263 } else { 1264 if (!(ctx->options & NFS_OPTION_FSCACHE)) 1265 return 0; 1266 if (ctx->fscache_uniq) { 1267 uniq = ctx->fscache_uniq; 1268 ulen = strlen(ctx->fscache_uniq); 1269 } 1270 } 1271 1272 return nfs_fscache_get_super_cookie(sb, uniq, ulen); 1273 } 1274 #else 1275 static int nfs_get_cache_cookie(struct super_block *sb, 1276 struct nfs_fs_context *ctx) 1277 { 1278 return 0; 1279 } 1280 #endif 1281 1282 int nfs_get_tree_common(struct fs_context *fc) 1283 { 1284 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1285 struct super_block *s; 1286 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; 1287 struct nfs_server *server = ctx->server; 1288 int error; 1289 1290 ctx->server = NULL; 1291 if (IS_ERR(server)) 1292 return PTR_ERR(server); 1293 1294 if (server->flags & NFS_MOUNT_UNSHARED) 1295 compare_super = NULL; 1296 1297 /* -o noac implies -o sync */ 1298 if (server->flags & NFS_MOUNT_NOAC) 1299 fc->sb_flags |= SB_SYNCHRONOUS; 1300 1301 /* Get a superblock - note that we may end up sharing one that already exists */ 1302 fc->s_fs_info = server; 1303 s = sget_fc(fc, compare_super, nfs_set_super); 1304 fc->s_fs_info = NULL; 1305 if (IS_ERR(s)) { 1306 error = PTR_ERR(s); 1307 nfs_errorf(fc, "NFS: Couldn't get superblock"); 1308 goto out_err_nosb; 1309 } 1310 1311 if (s->s_fs_info != server) { 1312 nfs_free_server(server); 1313 server = NULL; 1314 } else { 1315 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 1316 MINOR(server->s_dev)); 1317 if (error) 1318 goto error_splat_super; 1319 s->s_bdi->io_pages = server->rpages; 1320 server->super = s; 1321 } 1322 1323 if (!s->s_root) { 1324 /* initial superblock/root creation */ 1325 nfs_fill_super(s, ctx); 1326 error = nfs_get_cache_cookie(s, ctx); 1327 if (error < 0) 1328 goto error_splat_super; 1329 } 1330 1331 error = nfs_get_root(s, fc); 1332 if (error < 0) { 1333 nfs_errorf(fc, "NFS: Couldn't get root dentry"); 1334 goto error_splat_super; 1335 } 1336 1337 s->s_flags |= SB_ACTIVE; 1338 error = 0; 1339 1340 out: 1341 return error; 1342 1343 out_err_nosb: 1344 nfs_free_server(server); 1345 goto out; 1346 error_splat_super: 1347 deactivate_locked_super(s); 1348 goto out; 1349 } 1350 1351 /* 1352 * Destroy an NFS superblock 1353 */ 1354 void nfs_kill_super(struct super_block *s) 1355 { 1356 struct nfs_server *server = NFS_SB(s); 1357 1358 nfs_sysfs_move_sb_to_server(server); 1359 kill_anon_super(s); 1360 1361 nfs_fscache_release_super_cookie(s); 1362 1363 nfs_free_server(server); 1364 } 1365 EXPORT_SYMBOL_GPL(nfs_kill_super); 1366 1367 #if IS_ENABLED(CONFIG_NFS_V4) 1368 1369 /* 1370 * NFS v4 module parameters need to stay in the 1371 * NFS client for backwards compatibility 1372 */ 1373 unsigned int nfs_callback_set_tcpport; 1374 unsigned short nfs_callback_nr_threads; 1375 /* Default cache timeout is 10 minutes */ 1376 unsigned int nfs_idmap_cache_timeout = 600; 1377 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 1378 bool nfs4_disable_idmapping = true; 1379 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 1380 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 1381 unsigned short send_implementation_id = 1; 1382 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 1383 bool recover_lost_locks = false; 1384 short nfs_delay_retrans = -1; 1385 1386 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 1387 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 1388 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 1389 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 1390 EXPORT_SYMBOL_GPL(max_session_slots); 1391 EXPORT_SYMBOL_GPL(max_session_cb_slots); 1392 EXPORT_SYMBOL_GPL(send_implementation_id); 1393 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 1394 EXPORT_SYMBOL_GPL(recover_lost_locks); 1395 EXPORT_SYMBOL_GPL(nfs_delay_retrans); 1396 1397 #define NFS_CALLBACK_MAXPORTNR (65535U) 1398 1399 static int param_set_portnr(const char *val, const struct kernel_param *kp) 1400 { 1401 unsigned long num; 1402 int ret; 1403 1404 if (!val) 1405 return -EINVAL; 1406 ret = kstrtoul(val, 0, &num); 1407 if (ret || num > NFS_CALLBACK_MAXPORTNR) 1408 return -EINVAL; 1409 *((unsigned int *)kp->arg) = num; 1410 return 0; 1411 } 1412 static const struct kernel_param_ops param_ops_portnr = { 1413 .set = param_set_portnr, 1414 .get = param_get_uint, 1415 }; 1416 #define param_check_portnr(name, p) __param_check(name, p, unsigned int) 1417 1418 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 1419 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 1420 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 1421 "assigned to the NFSv4 callback channels."); 1422 module_param(nfs_idmap_cache_timeout, int, 0644); 1423 module_param(nfs4_disable_idmapping, bool, 0644); 1424 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 1425 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 1426 MODULE_PARM_DESC(nfs4_disable_idmapping, 1427 "Turn off NFSv4 idmapping when using 'sec=sys'"); 1428 module_param(max_session_slots, ushort, 0644); 1429 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 1430 "requests the client will negotiate"); 1431 module_param(max_session_cb_slots, ushort, 0644); 1432 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 1433 "callbacks the client will process for a given server"); 1434 module_param(send_implementation_id, ushort, 0644); 1435 MODULE_PARM_DESC(send_implementation_id, 1436 "Send implementation ID with NFSv4.1 exchange_id"); 1437 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 1438 1439 module_param(recover_lost_locks, bool, 0644); 1440 MODULE_PARM_DESC(recover_lost_locks, 1441 "If the server reports that a lock might be lost, " 1442 "try to recover it risking data corruption."); 1443 1444 module_param_named(delay_retrans, nfs_delay_retrans, short, 0644); 1445 MODULE_PARM_DESC(delay_retrans, 1446 "Unless negative, specifies the number of times the NFSv4 " 1447 "client retries a request before returning an EAGAIN error, " 1448 "after a reply of NFS4ERR_DELAY from the server."); 1449 #endif /* CONFIG_NFS_V4 */ 1450