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 <uapi/linux/tls.h> 63 64#include "nfs4_fs.h" 65#include "callback.h" 66#include "delegation.h" 67#include "iostat.h" 68#include "internal.h" 69#include "fscache.h" 70#include "nfs4session.h" 71#include "pnfs.h" 72#include "nfs.h" 73#include "netns.h" 74#include "sysfs.h" 75 76#define NFSDBG_FACILITY NFSDBG_VFS 77 78const struct super_operations nfs_sops = { 79 .alloc_inode = nfs_alloc_inode, 80 .free_inode = nfs_free_inode, 81 .write_inode = nfs_write_inode, 82 .drop_inode = nfs_drop_inode, 83 .statfs = nfs_statfs, 84 .evict_inode = nfs_evict_inode, 85 .umount_begin = nfs_umount_begin, 86 .show_options = nfs_show_options, 87 .show_devname = nfs_show_devname, 88 .show_path = nfs_show_path, 89 .show_stats = nfs_show_stats, 90}; 91EXPORT_SYMBOL_GPL(nfs_sops); 92 93#ifdef CONFIG_NFS_V4_2 94static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { 95 .sco_sb_deactive = nfs_sb_deactive, 96}; 97#endif 98 99#if IS_ENABLED(CONFIG_NFS_V4) 100static int __init register_nfs4_fs(void) 101{ 102 return register_filesystem(&nfs4_fs_type); 103} 104 105static void unregister_nfs4_fs(void) 106{ 107 unregister_filesystem(&nfs4_fs_type); 108} 109#else 110static int __init register_nfs4_fs(void) 111{ 112 return 0; 113} 114 115static void unregister_nfs4_fs(void) 116{ 117} 118#endif 119 120#ifdef CONFIG_NFS_V4_2 121static void nfs_ssc_register_ops(void) 122{ 123 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); 124} 125 126static void nfs_ssc_unregister_ops(void) 127{ 128 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); 129} 130#endif /* CONFIG_NFS_V4_2 */ 131 132static struct shrinker *acl_shrinker; 133 134/* 135 * Register the NFS filesystems 136 */ 137int __init register_nfs_fs(void) 138{ 139 int ret; 140 141 ret = register_filesystem(&nfs_fs_type); 142 if (ret < 0) 143 goto error_0; 144 145 ret = register_nfs4_fs(); 146 if (ret < 0) 147 goto error_1; 148 149 ret = nfs_register_sysctl(); 150 if (ret < 0) 151 goto error_2; 152 153 acl_shrinker = shrinker_alloc(0, "nfs-acl"); 154 if (!acl_shrinker) { 155 ret = -ENOMEM; 156 goto error_3; 157 } 158 159 acl_shrinker->count_objects = nfs_access_cache_count; 160 acl_shrinker->scan_objects = nfs_access_cache_scan; 161 162 shrinker_register(acl_shrinker); 163 164#ifdef CONFIG_NFS_V4_2 165 nfs_ssc_register_ops(); 166#endif 167 return 0; 168error_3: 169 nfs_unregister_sysctl(); 170error_2: 171 unregister_nfs4_fs(); 172error_1: 173 unregister_filesystem(&nfs_fs_type); 174error_0: 175 return ret; 176} 177 178/* 179 * Unregister the NFS filesystems 180 */ 181void __exit unregister_nfs_fs(void) 182{ 183 shrinker_free(acl_shrinker); 184 nfs_unregister_sysctl(); 185 unregister_nfs4_fs(); 186#ifdef CONFIG_NFS_V4_2 187 nfs_ssc_unregister_ops(); 188#endif 189 unregister_filesystem(&nfs_fs_type); 190} 191 192bool nfs_sb_active(struct super_block *sb) 193{ 194 struct nfs_server *server = NFS_SB(sb); 195 196 if (!atomic_inc_not_zero(&sb->s_active)) 197 return false; 198 if (atomic_inc_return(&server->active) != 1) 199 atomic_dec(&sb->s_active); 200 return true; 201} 202EXPORT_SYMBOL_GPL(nfs_sb_active); 203 204void nfs_sb_deactive(struct super_block *sb) 205{ 206 struct nfs_server *server = NFS_SB(sb); 207 208 if (atomic_dec_and_test(&server->active)) 209 deactivate_super(sb); 210} 211EXPORT_SYMBOL_GPL(nfs_sb_deactive); 212 213static int __nfs_list_for_each_server(struct list_head *head, 214 int (*fn)(struct nfs_server *, void *), 215 void *data) 216{ 217 struct nfs_server *server, *last = NULL; 218 int ret = 0; 219 220 rcu_read_lock(); 221 list_for_each_entry_rcu(server, head, client_link) { 222 if (!(server->super && nfs_sb_active(server->super))) 223 continue; 224 rcu_read_unlock(); 225 if (last) 226 nfs_sb_deactive(last->super); 227 last = server; 228 ret = fn(server, data); 229 if (ret) 230 goto out; 231 rcu_read_lock(); 232 } 233 rcu_read_unlock(); 234out: 235 if (last) 236 nfs_sb_deactive(last->super); 237 return ret; 238} 239 240int nfs_client_for_each_server(struct nfs_client *clp, 241 int (*fn)(struct nfs_server *, void *), 242 void *data) 243{ 244 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); 245} 246EXPORT_SYMBOL_GPL(nfs_client_for_each_server); 247 248/* 249 * Deliver file system statistics to userspace 250 */ 251int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 252{ 253 struct nfs_server *server = NFS_SB(dentry->d_sb); 254 unsigned char blockbits; 255 unsigned long blockres; 256 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 257 struct nfs_fsstat res; 258 int error = -ENOMEM; 259 260 res.fattr = nfs_alloc_fattr(); 261 if (res.fattr == NULL) 262 goto out_err; 263 264 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 265 if (unlikely(error == -ESTALE)) { 266 struct dentry *pd_dentry; 267 268 pd_dentry = dget_parent(dentry); 269 nfs_zap_caches(d_inode(pd_dentry)); 270 dput(pd_dentry); 271 } 272 nfs_free_fattr(res.fattr); 273 if (error < 0) 274 goto out_err; 275 276 buf->f_type = NFS_SUPER_MAGIC; 277 278 /* 279 * Current versions of glibc do not correctly handle the 280 * case where f_frsize != f_bsize. Eventually we want to 281 * report the value of wtmult in this field. 282 */ 283 buf->f_frsize = dentry->d_sb->s_blocksize; 284 285 /* 286 * On most *nix systems, f_blocks, f_bfree, and f_bavail 287 * are reported in units of f_frsize. Linux hasn't had 288 * an f_frsize field in its statfs struct until recently, 289 * thus historically Linux's sys_statfs reports these 290 * fields in units of f_bsize. 291 */ 292 buf->f_bsize = dentry->d_sb->s_blocksize; 293 blockbits = dentry->d_sb->s_blocksize_bits; 294 blockres = (1 << blockbits) - 1; 295 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 296 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 297 buf->f_bavail = (res.abytes + blockres) >> blockbits; 298 299 buf->f_files = res.tfiles; 300 buf->f_ffree = res.afiles; 301 302 buf->f_namelen = server->namelen; 303 304 return 0; 305 306 out_err: 307 dprintk("%s: statfs error = %d\n", __func__, -error); 308 return error; 309} 310EXPORT_SYMBOL_GPL(nfs_statfs); 311 312/* 313 * Map the security flavour number to a name 314 */ 315static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 316{ 317 static const struct { 318 rpc_authflavor_t flavour; 319 const char *str; 320 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 321 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 322 { RPC_AUTH_NULL, "null" }, 323 { RPC_AUTH_UNIX, "sys" }, 324 { RPC_AUTH_GSS_KRB5, "krb5" }, 325 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 326 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 327 { RPC_AUTH_GSS_LKEY, "lkey" }, 328 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 329 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 330 { RPC_AUTH_GSS_SPKM, "spkm" }, 331 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 332 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 333 { UINT_MAX, "unknown" } 334 }; 335 int i; 336 337 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 338 if (sec_flavours[i].flavour == flavour) 339 break; 340 } 341 return sec_flavours[i].str; 342} 343 344static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 345 int showdefaults) 346{ 347 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 348 char *proto = NULL; 349 350 switch (sap->sa_family) { 351 case AF_INET: 352 switch (nfss->mountd_protocol) { 353 case IPPROTO_UDP: 354 proto = RPCBIND_NETID_UDP; 355 break; 356 case IPPROTO_TCP: 357 proto = RPCBIND_NETID_TCP; 358 break; 359 } 360 break; 361 case AF_INET6: 362 switch (nfss->mountd_protocol) { 363 case IPPROTO_UDP: 364 proto = RPCBIND_NETID_UDP6; 365 break; 366 case IPPROTO_TCP: 367 proto = RPCBIND_NETID_TCP6; 368 break; 369 } 370 break; 371 } 372 if (proto || showdefaults) 373 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 374} 375 376static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 377 int showdefaults) 378{ 379 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 380 381 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 382 return; 383 384 switch (sap->sa_family) { 385 case AF_INET: { 386 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 387 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 388 break; 389 } 390 case AF_INET6: { 391 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 392 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 393 break; 394 } 395 default: 396 if (showdefaults) 397 seq_puts(m, ",mountaddr=unspecified"); 398 } 399 400 if (nfss->mountd_version || showdefaults) 401 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 402 if ((nfss->mountd_port && 403 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 404 showdefaults) 405 seq_printf(m, ",mountport=%u", nfss->mountd_port); 406 407 nfs_show_mountd_netid(m, nfss, showdefaults); 408} 409 410#if IS_ENABLED(CONFIG_NFS_V4) 411static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 412 int showdefaults) 413{ 414 struct nfs_client *clp = nfss->nfs_client; 415 416 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 417} 418#else 419static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 420 int showdefaults) 421{ 422} 423#endif 424 425static void nfs_show_nfs_version(struct seq_file *m, 426 unsigned int version, 427 unsigned int minorversion) 428{ 429 seq_printf(m, ",vers=%u", version); 430 if (version == 4) 431 seq_printf(m, ".%u", minorversion); 432} 433 434/* 435 * Describe the mount options in force on this server representation 436 */ 437static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 438 int showdefaults) 439{ 440 static const struct proc_nfs_info { 441 int flag; 442 const char *str; 443 const char *nostr; 444 } nfs_info[] = { 445 { NFS_MOUNT_SOFT, ",soft", "" }, 446 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 447 { NFS_MOUNT_SOFTREVAL, ",softreval", "" }, 448 { NFS_MOUNT_POSIX, ",posix", "" }, 449 { NFS_MOUNT_NOCTO, ",nocto", "" }, 450 { NFS_MOUNT_NOAC, ",noac", "" }, 451 { NFS_MOUNT_NONLM, ",nolock", "" }, 452 { NFS_MOUNT_NOACL, ",noacl", "" }, 453 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 454 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 455 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 456 { 0, NULL, NULL } 457 }; 458 const struct proc_nfs_info *nfs_infop; 459 struct nfs_client *clp = nfss->nfs_client; 460 u32 version = clp->rpc_ops->version; 461 int local_flock, local_fcntl; 462 463 nfs_show_nfs_version(m, version, clp->cl_minorversion); 464 seq_printf(m, ",rsize=%u", nfss->rsize); 465 seq_printf(m, ",wsize=%u", nfss->wsize); 466 if (nfss->bsize != 0) 467 seq_printf(m, ",bsize=%u", nfss->bsize); 468 seq_printf(m, ",namlen=%u", nfss->namelen); 469 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 470 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 471 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 472 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 473 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 474 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 475 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 476 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 477 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 478 seq_puts(m, ",hard"); 479 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 480 if (nfss->flags & nfs_infop->flag) 481 seq_puts(m, nfs_infop->str); 482 else 483 seq_puts(m, nfs_infop->nostr); 484 } 485 rcu_read_lock(); 486 seq_printf(m, ",proto=%s", 487 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 488 rcu_read_unlock(); 489 if (clp->cl_nconnect > 0) 490 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 491 if (version == 4) { 492 if (clp->cl_max_connect > 1) 493 seq_printf(m, ",max_connect=%u", clp->cl_max_connect); 494 if (nfss->port != NFS_PORT) 495 seq_printf(m, ",port=%u", nfss->port); 496 } else 497 if (nfss->port) 498 seq_printf(m, ",port=%u", nfss->port); 499 500 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 501 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 502 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 503 switch (clp->cl_xprtsec.policy) { 504 case RPC_XPRTSEC_TLS_ANON: 505 seq_puts(m, ",xprtsec=tls"); 506 break; 507 case RPC_XPRTSEC_TLS_X509: 508 seq_puts(m, ",xprtsec=mtls"); 509 break; 510 default: 511 break; 512 } 513 514 if (version != 4) 515 nfs_show_mountd_options(m, nfss, showdefaults); 516 else 517 nfs_show_nfsv4_options(m, nfss, showdefaults); 518 519 if (nfss->options & NFS_OPTION_FSCACHE) { 520#ifdef CONFIG_NFS_FSCACHE 521 if (nfss->fscache_uniq) 522 seq_printf(m, ",fsc=%s", nfss->fscache_uniq); 523 else 524 seq_puts(m, ",fsc"); 525#else 526 seq_puts(m, ",fsc"); 527#endif 528 } 529 530 if (nfss->options & NFS_OPTION_MIGRATION) 531 seq_puts(m, ",migration"); 532 533 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 534 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 535 seq_puts(m, ",lookupcache=none"); 536 else 537 seq_puts(m, ",lookupcache=pos"); 538 } 539 540 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 541 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 542 543 if (!local_flock && !local_fcntl) 544 seq_puts(m, ",local_lock=none"); 545 else if (local_flock && local_fcntl) 546 seq_puts(m, ",local_lock=all"); 547 else if (local_flock) 548 seq_puts(m, ",local_lock=flock"); 549 else 550 seq_puts(m, ",local_lock=posix"); 551 552 if (nfss->flags & NFS_MOUNT_WRITE_EAGER) { 553 if (nfss->flags & NFS_MOUNT_WRITE_WAIT) 554 seq_puts(m, ",write=wait"); 555 else 556 seq_puts(m, ",write=eager"); 557 } 558} 559 560/* 561 * Describe the mount options on this VFS mountpoint 562 */ 563int nfs_show_options(struct seq_file *m, struct dentry *root) 564{ 565 struct nfs_server *nfss = NFS_SB(root->d_sb); 566 567 nfs_show_mount_options(m, nfss, 0); 568 569 rcu_read_lock(); 570 seq_printf(m, ",addr=%s", 571 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 572 RPC_DISPLAY_ADDR)); 573 rcu_read_unlock(); 574 575 return 0; 576} 577EXPORT_SYMBOL_GPL(nfs_show_options); 578 579#if IS_ENABLED(CONFIG_NFS_V4) 580static void show_lease(struct seq_file *m, struct nfs_server *server) 581{ 582 struct nfs_client *clp = server->nfs_client; 583 unsigned long expire; 584 585 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 586 expire = clp->cl_last_renewal + clp->cl_lease_time; 587 seq_printf(m, ",lease_expired=%ld", 588 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 589} 590#ifdef CONFIG_NFS_V4_1 591static void show_sessions(struct seq_file *m, struct nfs_server *server) 592{ 593 if (nfs4_has_session(server->nfs_client)) 594 seq_puts(m, ",sessions"); 595} 596#else 597static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 598#endif 599#endif 600 601#ifdef CONFIG_NFS_V4_1 602static void show_pnfs(struct seq_file *m, struct nfs_server *server) 603{ 604 seq_printf(m, ",pnfs="); 605 if (server->pnfs_curr_ld) 606 seq_printf(m, "%s", server->pnfs_curr_ld->name); 607 else 608 seq_printf(m, "not configured"); 609} 610 611static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 612{ 613 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 614 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 615 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 616 "date='%llu,%u'", 617 impl_id->name, impl_id->domain, 618 impl_id->date.seconds, impl_id->date.nseconds); 619 } 620} 621#else 622#if IS_ENABLED(CONFIG_NFS_V4) 623static void show_pnfs(struct seq_file *m, struct nfs_server *server) 624{ 625} 626#endif 627static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 628{ 629} 630#endif 631 632int nfs_show_devname(struct seq_file *m, struct dentry *root) 633{ 634 char *page = (char *) __get_free_page(GFP_KERNEL); 635 char *devname, *dummy; 636 int err = 0; 637 if (!page) 638 return -ENOMEM; 639 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 640 if (IS_ERR(devname)) 641 err = PTR_ERR(devname); 642 else 643 seq_escape(m, devname, " \t\n\\"); 644 free_page((unsigned long)page); 645 return err; 646} 647EXPORT_SYMBOL_GPL(nfs_show_devname); 648 649int nfs_show_path(struct seq_file *m, struct dentry *dentry) 650{ 651 seq_puts(m, "/"); 652 return 0; 653} 654EXPORT_SYMBOL_GPL(nfs_show_path); 655 656/* 657 * Present statistical information for this VFS mountpoint 658 */ 659int nfs_show_stats(struct seq_file *m, struct dentry *root) 660{ 661 int i, cpu; 662 struct nfs_server *nfss = NFS_SB(root->d_sb); 663 struct rpc_auth *auth = nfss->client->cl_auth; 664 struct nfs_iostats totals = { }; 665 666 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 667 668 /* 669 * Display all mount option settings 670 */ 671 seq_puts(m, "\n\topts:\t"); 672 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 673 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 674 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 675 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 676 nfs_show_mount_options(m, nfss, 1); 677 678 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 679 680 show_implementation_id(m, nfss); 681 682 seq_puts(m, "\n\tcaps:\t"); 683 seq_printf(m, "caps=0x%x", nfss->caps); 684 seq_printf(m, ",wtmult=%u", nfss->wtmult); 685 seq_printf(m, ",dtsize=%u", nfss->dtsize); 686 seq_printf(m, ",bsize=%u", nfss->bsize); 687 seq_printf(m, ",namlen=%u", nfss->namelen); 688 689#if IS_ENABLED(CONFIG_NFS_V4) 690 if (nfss->nfs_client->rpc_ops->version == 4) { 691 seq_puts(m, "\n\tnfsv4:\t"); 692 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 693 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 694 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 695 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 696 show_sessions(m, nfss); 697 show_pnfs(m, nfss); 698 show_lease(m, nfss); 699 } 700#endif 701 702 /* 703 * Display security flavor in effect for this mount 704 */ 705 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 706 if (auth->au_flavor) 707 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 708 709 /* 710 * Display superblock I/O counters 711 */ 712 for_each_possible_cpu(cpu) { 713 struct nfs_iostats *stats; 714 715 preempt_disable(); 716 stats = per_cpu_ptr(nfss->io_stats, cpu); 717 718 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 719 totals.events[i] += stats->events[i]; 720 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 721 totals.bytes[i] += stats->bytes[i]; 722 723 preempt_enable(); 724 } 725 726 seq_puts(m, "\n\tevents:\t"); 727 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 728 seq_printf(m, "%lu ", totals.events[i]); 729 seq_puts(m, "\n\tbytes:\t"); 730 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 731 seq_printf(m, "%Lu ", totals.bytes[i]); 732 seq_putc(m, '\n'); 733 734 rpc_clnt_show_stats(m, nfss->client); 735 736 return 0; 737} 738EXPORT_SYMBOL_GPL(nfs_show_stats); 739 740/* 741 * Begin unmount by attempting to remove all automounted mountpoints we added 742 * in response to xdev traversals and referrals 743 */ 744void nfs_umount_begin(struct super_block *sb) 745{ 746 struct nfs_server *server; 747 struct rpc_clnt *rpc; 748 749 server = NFS_SB(sb); 750 /* -EIO all pending I/O */ 751 rpc = server->client_acl; 752 if (!IS_ERR(rpc)) 753 rpc_killall_tasks(rpc); 754 rpc = server->client; 755 if (!IS_ERR(rpc)) 756 rpc_killall_tasks(rpc); 757} 758EXPORT_SYMBOL_GPL(nfs_umount_begin); 759 760/* 761 * Return true if 'match' is in auth_info or auth_info is empty. 762 * Return false otherwise. 763 */ 764bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 765 rpc_authflavor_t match) 766{ 767 int i; 768 769 if (!auth_info->flavor_len) 770 return true; 771 772 for (i = 0; i < auth_info->flavor_len; i++) { 773 if (auth_info->flavors[i] == match) 774 return true; 775 } 776 return false; 777} 778EXPORT_SYMBOL_GPL(nfs_auth_info_match); 779 780/* 781 * Ensure that a specified authtype in ctx->auth_info is supported by 782 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and 783 * -EACCES if not. 784 */ 785static int nfs_verify_authflavors(struct nfs_fs_context *ctx, 786 rpc_authflavor_t *server_authlist, 787 unsigned int count) 788{ 789 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 790 bool found_auth_null = false; 791 unsigned int i; 792 793 /* 794 * If the sec= mount option is used, the specified flavor or AUTH_NULL 795 * must be in the list returned by the server. 796 * 797 * AUTH_NULL has a special meaning when it's in the server list - it 798 * means that the server will ignore the rpc creds, so any flavor 799 * can be used but still use the sec= that was specified. 800 * 801 * Note also that the MNT procedure in MNTv1 does not return a list 802 * of supported security flavors. In this case, nfs_mount() fabricates 803 * a security flavor list containing just AUTH_NULL. 804 */ 805 for (i = 0; i < count; i++) { 806 flavor = server_authlist[i]; 807 808 if (nfs_auth_info_match(&ctx->auth_info, flavor)) 809 goto out; 810 811 if (flavor == RPC_AUTH_NULL) 812 found_auth_null = true; 813 } 814 815 if (found_auth_null) { 816 flavor = ctx->auth_info.flavors[0]; 817 goto out; 818 } 819 820 dfprintk(MOUNT, 821 "NFS: specified auth flavors not supported by server\n"); 822 return -EACCES; 823 824out: 825 ctx->selected_flavor = flavor; 826 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); 827 return 0; 828} 829 830/* 831 * Use the remote server's MOUNT service to request the NFS file handle 832 * corresponding to the provided path. 833 */ 834static int nfs_request_mount(struct fs_context *fc, 835 struct nfs_fh *root_fh, 836 rpc_authflavor_t *server_authlist, 837 unsigned int *server_authlist_len) 838{ 839 struct nfs_fs_context *ctx = nfs_fc2context(fc); 840 struct nfs_mount_request request = { 841 .sap = &ctx->mount_server._address, 842 .dirpath = ctx->nfs_server.export_path, 843 .protocol = ctx->mount_server.protocol, 844 .fh = root_fh, 845 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, 846 .auth_flav_len = server_authlist_len, 847 .auth_flavs = server_authlist, 848 .net = fc->net_ns, 849 }; 850 int status; 851 852 if (ctx->mount_server.version == 0) { 853 switch (ctx->version) { 854 default: 855 ctx->mount_server.version = NFS_MNT3_VERSION; 856 break; 857 case 2: 858 ctx->mount_server.version = NFS_MNT_VERSION; 859 } 860 } 861 request.version = ctx->mount_server.version; 862 863 if (ctx->mount_server.hostname) 864 request.hostname = ctx->mount_server.hostname; 865 else 866 request.hostname = ctx->nfs_server.hostname; 867 868 /* 869 * Construct the mount server's address. 870 */ 871 if (ctx->mount_server.address.sa_family == AF_UNSPEC) { 872 memcpy(request.sap, &ctx->nfs_server._address, 873 ctx->nfs_server.addrlen); 874 ctx->mount_server.addrlen = ctx->nfs_server.addrlen; 875 } 876 request.salen = ctx->mount_server.addrlen; 877 nfs_set_port(request.sap, &ctx->mount_server.port, 0); 878 879 /* 880 * Now ask the mount server to map our export path 881 * to a file handle. 882 */ 883 status = nfs_mount(&request, ctx->timeo, ctx->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 893static 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 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); 905 if (status) 906 return ERR_PTR(status); 907 908 /* 909 * Was a sec= authflavor specified in the options? First, verify 910 * whether the server supports it, and then just try to use it if so. 911 */ 912 if (ctx->auth_info.flavor_len > 0) { 913 status = nfs_verify_authflavors(ctx, authlist, authlist_len); 914 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 915 ctx->selected_flavor); 916 if (status) 917 return ERR_PTR(status); 918 return ctx->nfs_mod->rpc_ops->create_server(fc); 919 } 920 921 /* 922 * No sec= option was provided. RFC 2623, section 2.7 suggests we 923 * SHOULD prefer the flavor listed first. However, some servers list 924 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 925 */ 926 for (i = 0; i < authlist_len; ++i) { 927 rpc_authflavor_t flavor; 928 struct rpcsec_gss_info info; 929 930 flavor = authlist[i]; 931 switch (flavor) { 932 case RPC_AUTH_UNIX: 933 tried_auth_unix = true; 934 break; 935 case RPC_AUTH_NULL: 936 auth_null_in_list = true; 937 continue; 938 default: 939 if (rpcauth_get_gssinfo(flavor, &info) != 0) 940 continue; 941 break; 942 } 943 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 944 ctx->selected_flavor = flavor; 945 server = ctx->nfs_mod->rpc_ops->create_server(fc); 946 if (!IS_ERR(server)) 947 return server; 948 } 949 950 /* 951 * Nothing we tried so far worked. At this point, give up if we've 952 * already tried AUTH_UNIX or if the server's list doesn't contain 953 * AUTH_NULL 954 */ 955 if (tried_auth_unix || !auth_null_in_list) 956 return server; 957 958 /* Last chance! Try AUTH_UNIX */ 959 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 960 ctx->selected_flavor = RPC_AUTH_UNIX; 961 return ctx->nfs_mod->rpc_ops->create_server(fc); 962} 963 964int nfs_try_get_tree(struct fs_context *fc) 965{ 966 struct nfs_fs_context *ctx = nfs_fc2context(fc); 967 968 if (ctx->need_mount) 969 ctx->server = nfs_try_mount_request(fc); 970 else 971 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); 972 973 return nfs_get_tree_common(fc); 974} 975EXPORT_SYMBOL_GPL(nfs_try_get_tree); 976 977 978#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 979 | NFS_MOUNT_SECURE \ 980 | NFS_MOUNT_TCP \ 981 | NFS_MOUNT_VER3 \ 982 | NFS_MOUNT_KERBEROS \ 983 | NFS_MOUNT_NONLM \ 984 | NFS_MOUNT_BROKEN_SUID \ 985 | NFS_MOUNT_STRICTLOCK \ 986 | NFS_MOUNT_LEGACY_INTERFACE) 987 988#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 989 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 990 991static int 992nfs_compare_remount_data(struct nfs_server *nfss, 993 struct nfs_fs_context *ctx) 994{ 995 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 996 ctx->rsize != nfss->rsize || 997 ctx->wsize != nfss->wsize || 998 ctx->version != nfss->nfs_client->rpc_ops->version || 999 ctx->minorversion != nfss->nfs_client->cl_minorversion || 1000 ctx->retrans != nfss->client->cl_timeout->to_retries || 1001 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || 1002 ctx->acregmin != nfss->acregmin / HZ || 1003 ctx->acregmax != nfss->acregmax / HZ || 1004 ctx->acdirmin != nfss->acdirmin / HZ || 1005 ctx->acdirmax != nfss->acdirmax / HZ || 1006 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 1007 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || 1008 ctx->nfs_server.port != nfss->port || 1009 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 1010 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, 1011 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 1012 return -EINVAL; 1013 1014 return 0; 1015} 1016 1017int nfs_reconfigure(struct fs_context *fc) 1018{ 1019 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1020 struct super_block *sb = fc->root->d_sb; 1021 struct nfs_server *nfss = sb->s_fs_info; 1022 int ret; 1023 1024 sync_filesystem(sb); 1025 1026 /* 1027 * Userspace mount programs that send binary options generally send 1028 * them populated with default values. We have no way to know which 1029 * ones were explicitly specified. Fall back to legacy behavior and 1030 * just return success. 1031 */ 1032 if (ctx->skip_reconfig_option_check) 1033 return 0; 1034 1035 /* 1036 * noac is a special case. It implies -o sync, but that's not 1037 * necessarily reflected in the mtab options. reconfigure_super 1038 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 1039 * remount options, so we have to explicitly reset it. 1040 */ 1041 if (ctx->flags & NFS_MOUNT_NOAC) { 1042 fc->sb_flags |= SB_SYNCHRONOUS; 1043 fc->sb_flags_mask |= SB_SYNCHRONOUS; 1044 } 1045 1046 /* compare new mount options with old ones */ 1047 ret = nfs_compare_remount_data(nfss, ctx); 1048 if (ret) 1049 return ret; 1050 1051 return nfs_probe_server(nfss, NFS_FH(d_inode(fc->root))); 1052} 1053EXPORT_SYMBOL_GPL(nfs_reconfigure); 1054 1055/* 1056 * Finish setting up an NFS superblock 1057 */ 1058static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) 1059{ 1060 struct nfs_server *server = NFS_SB(sb); 1061 1062 sb->s_blocksize_bits = 0; 1063 sb->s_blocksize = 0; 1064 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 1065 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 1066 if (ctx->bsize) 1067 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); 1068 1069 switch (server->nfs_client->rpc_ops->version) { 1070 case 2: 1071 sb->s_time_gran = 1000; 1072 sb->s_time_min = 0; 1073 sb->s_time_max = U32_MAX; 1074 break; 1075 case 3: 1076 /* 1077 * The VFS shouldn't apply the umask to mode bits. 1078 * We will do so ourselves when necessary. 1079 */ 1080 sb->s_flags |= SB_POSIXACL; 1081 sb->s_time_gran = 1; 1082 sb->s_time_min = 0; 1083 sb->s_time_max = U32_MAX; 1084 sb->s_export_op = &nfs_export_ops; 1085 break; 1086 case 4: 1087 sb->s_iflags |= SB_I_NOUMASK; 1088 sb->s_time_gran = 1; 1089 sb->s_time_min = S64_MIN; 1090 sb->s_time_max = S64_MAX; 1091 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1092 sb->s_export_op = &nfs_export_ops; 1093 break; 1094 } 1095 1096 sb->s_magic = NFS_SUPER_MAGIC; 1097 1098 /* We probably want something more informative here */ 1099 snprintf(sb->s_id, sizeof(sb->s_id), 1100 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1101 1102 if (sb->s_blocksize == 0) 1103 sb->s_blocksize = nfs_block_bits(server->wsize, 1104 &sb->s_blocksize_bits); 1105 1106 nfs_super_set_maxbytes(sb, server->maxfilesize); 1107 nfs_sysfs_move_server_to_sb(sb); 1108 server->has_sec_mnt_opts = ctx->has_sec_mnt_opts; 1109} 1110 1111static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, 1112 const struct fs_context *fc) 1113{ 1114 const struct nfs_server *a = s->s_fs_info; 1115 const struct rpc_clnt *clnt_a = a->client; 1116 const struct rpc_clnt *clnt_b = b->client; 1117 1118 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) 1119 goto Ebusy; 1120 if (a->nfs_client != b->nfs_client) 1121 goto Ebusy; 1122 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 1123 goto Ebusy; 1124 if (a->wsize != b->wsize) 1125 goto Ebusy; 1126 if (a->rsize != b->rsize) 1127 goto Ebusy; 1128 if (a->acregmin != b->acregmin) 1129 goto Ebusy; 1130 if (a->acregmax != b->acregmax) 1131 goto Ebusy; 1132 if (a->acdirmin != b->acdirmin) 1133 goto Ebusy; 1134 if (a->acdirmax != b->acdirmax) 1135 goto Ebusy; 1136 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1137 goto Ebusy; 1138 return 1; 1139Ebusy: 1140 return 0; 1141} 1142 1143static int nfs_set_super(struct super_block *s, struct fs_context *fc) 1144{ 1145 struct nfs_server *server = fc->s_fs_info; 1146 int ret; 1147 1148 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 1149 ret = set_anon_super(s, server); 1150 if (ret == 0) 1151 server->s_dev = s->s_dev; 1152 return ret; 1153} 1154 1155static int nfs_compare_super_address(struct nfs_server *server1, 1156 struct nfs_server *server2) 1157{ 1158 struct sockaddr *sap1, *sap2; 1159 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 1160 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 1161 1162 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 1163 return 0; 1164 1165 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1166 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1167 1168 if (sap1->sa_family != sap2->sa_family) 1169 return 0; 1170 1171 switch (sap1->sa_family) { 1172 case AF_INET: { 1173 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1174 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1175 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1176 return 0; 1177 if (sin1->sin_port != sin2->sin_port) 1178 return 0; 1179 break; 1180 } 1181 case AF_INET6: { 1182 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1183 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1184 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1185 return 0; 1186 if (sin1->sin6_port != sin2->sin6_port) 1187 return 0; 1188 break; 1189 } 1190 default: 1191 return 0; 1192 } 1193 1194 return 1; 1195} 1196 1197static int nfs_compare_userns(const struct nfs_server *old, 1198 const struct nfs_server *new) 1199{ 1200 const struct user_namespace *oldns = &init_user_ns; 1201 const struct user_namespace *newns = &init_user_ns; 1202 1203 if (old->client && old->client->cl_cred) 1204 oldns = old->client->cl_cred->user_ns; 1205 if (new->client && new->client->cl_cred) 1206 newns = new->client->cl_cred->user_ns; 1207 if (oldns != newns) 1208 return 0; 1209 return 1; 1210} 1211 1212static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) 1213{ 1214 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); 1215 1216 if (!nfs_compare_super_address(old, server)) 1217 return 0; 1218 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1219 if (old->flags & NFS_MOUNT_UNSHARED) 1220 return 0; 1221 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1222 return 0; 1223 if (!nfs_compare_userns(old, server)) 1224 return 0; 1225 if ((old->has_sec_mnt_opts || fc->security) && 1226 security_sb_mnt_opts_compat(sb, fc->security)) 1227 return 0; 1228 return nfs_compare_mount_options(sb, server, fc); 1229} 1230 1231#ifdef CONFIG_NFS_FSCACHE 1232static int nfs_get_cache_cookie(struct super_block *sb, 1233 struct nfs_fs_context *ctx) 1234{ 1235 struct nfs_server *nfss = NFS_SB(sb); 1236 char *uniq = NULL; 1237 int ulen = 0; 1238 1239 nfss->fscache = NULL; 1240 1241 if (!ctx) 1242 return 0; 1243 1244 if (ctx->clone_data.sb) { 1245 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); 1246 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 1247 return 0; 1248 if (mnt_s->fscache_uniq) { 1249 uniq = mnt_s->fscache_uniq; 1250 ulen = strlen(uniq); 1251 } 1252 } else { 1253 if (!(ctx->options & NFS_OPTION_FSCACHE)) 1254 return 0; 1255 if (ctx->fscache_uniq) { 1256 uniq = ctx->fscache_uniq; 1257 ulen = strlen(ctx->fscache_uniq); 1258 } 1259 } 1260 1261 return nfs_fscache_get_super_cookie(sb, uniq, ulen); 1262} 1263#else 1264static int nfs_get_cache_cookie(struct super_block *sb, 1265 struct nfs_fs_context *ctx) 1266{ 1267 return 0; 1268} 1269#endif 1270 1271int nfs_get_tree_common(struct fs_context *fc) 1272{ 1273 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1274 struct super_block *s; 1275 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; 1276 struct nfs_server *server = ctx->server; 1277 int error; 1278 1279 ctx->server = NULL; 1280 if (IS_ERR(server)) 1281 return PTR_ERR(server); 1282 1283 if (server->flags & NFS_MOUNT_UNSHARED) 1284 compare_super = NULL; 1285 1286 /* -o noac implies -o sync */ 1287 if (server->flags & NFS_MOUNT_NOAC) 1288 fc->sb_flags |= SB_SYNCHRONOUS; 1289 1290 if (ctx->clone_data.sb) 1291 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) 1292 fc->sb_flags |= SB_SYNCHRONOUS; 1293 1294 /* Get a superblock - note that we may end up sharing one that already exists */ 1295 fc->s_fs_info = server; 1296 s = sget_fc(fc, compare_super, nfs_set_super); 1297 fc->s_fs_info = NULL; 1298 if (IS_ERR(s)) { 1299 error = PTR_ERR(s); 1300 nfs_errorf(fc, "NFS: Couldn't get superblock"); 1301 goto out_err_nosb; 1302 } 1303 1304 if (s->s_fs_info != server) { 1305 nfs_free_server(server); 1306 server = NULL; 1307 } else { 1308 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 1309 MINOR(server->s_dev)); 1310 if (error) 1311 goto error_splat_super; 1312 s->s_bdi->io_pages = server->rpages; 1313 server->super = s; 1314 } 1315 1316 if (!s->s_root) { 1317 unsigned bsize = ctx->clone_data.inherited_bsize; 1318 /* initial superblock/root creation */ 1319 nfs_fill_super(s, ctx); 1320 if (bsize) { 1321 s->s_blocksize_bits = bsize; 1322 s->s_blocksize = 1U << bsize; 1323 } 1324 error = nfs_get_cache_cookie(s, ctx); 1325 if (error < 0) 1326 goto error_splat_super; 1327 } 1328 1329 error = nfs_get_root(s, fc); 1330 if (error < 0) { 1331 nfs_errorf(fc, "NFS: Couldn't get root dentry"); 1332 goto error_splat_super; 1333 } 1334 1335 s->s_flags |= SB_ACTIVE; 1336 error = 0; 1337 1338out: 1339 return error; 1340 1341out_err_nosb: 1342 nfs_free_server(server); 1343 goto out; 1344error_splat_super: 1345 deactivate_locked_super(s); 1346 goto out; 1347} 1348 1349/* 1350 * Destroy an NFS superblock 1351 */ 1352void nfs_kill_super(struct super_block *s) 1353{ 1354 struct nfs_server *server = NFS_SB(s); 1355 1356 nfs_sysfs_move_sb_to_server(server); 1357 kill_anon_super(s); 1358 1359 nfs_fscache_release_super_cookie(s); 1360 1361 nfs_free_server(server); 1362} 1363EXPORT_SYMBOL_GPL(nfs_kill_super); 1364 1365#if IS_ENABLED(CONFIG_NFS_V4) 1366 1367/* 1368 * NFS v4 module parameters need to stay in the 1369 * NFS client for backwards compatibility 1370 */ 1371unsigned int nfs_callback_set_tcpport; 1372unsigned short nfs_callback_nr_threads; 1373/* Default cache timeout is 10 minutes */ 1374unsigned int nfs_idmap_cache_timeout = 600; 1375/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 1376bool nfs4_disable_idmapping = true; 1377unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 1378unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 1379unsigned short send_implementation_id = 1; 1380char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 1381bool recover_lost_locks = false; 1382short nfs_delay_retrans = -1; 1383 1384EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 1385EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 1386EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 1387EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 1388EXPORT_SYMBOL_GPL(max_session_slots); 1389EXPORT_SYMBOL_GPL(max_session_cb_slots); 1390EXPORT_SYMBOL_GPL(send_implementation_id); 1391EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 1392EXPORT_SYMBOL_GPL(recover_lost_locks); 1393EXPORT_SYMBOL_GPL(nfs_delay_retrans); 1394 1395#define NFS_CALLBACK_MAXPORTNR (65535U) 1396 1397static int param_set_portnr(const char *val, const struct kernel_param *kp) 1398{ 1399 unsigned long num; 1400 int ret; 1401 1402 if (!val) 1403 return -EINVAL; 1404 ret = kstrtoul(val, 0, &num); 1405 if (ret || num > NFS_CALLBACK_MAXPORTNR) 1406 return -EINVAL; 1407 *((unsigned int *)kp->arg) = num; 1408 return 0; 1409} 1410static const struct kernel_param_ops param_ops_portnr = { 1411 .set = param_set_portnr, 1412 .get = param_get_uint, 1413}; 1414#define param_check_portnr(name, p) __param_check(name, p, unsigned int) 1415 1416module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 1417module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 1418MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 1419 "assigned to the NFSv4 callback channels."); 1420module_param(nfs_idmap_cache_timeout, int, 0644); 1421module_param(nfs4_disable_idmapping, bool, 0644); 1422module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 1423 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 1424MODULE_PARM_DESC(nfs4_disable_idmapping, 1425 "Turn off NFSv4 idmapping when using 'sec=sys'"); 1426module_param(max_session_slots, ushort, 0644); 1427MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 1428 "requests the client will negotiate"); 1429module_param(max_session_cb_slots, ushort, 0644); 1430MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 1431 "callbacks the client will process for a given server"); 1432module_param(send_implementation_id, ushort, 0644); 1433MODULE_PARM_DESC(send_implementation_id, 1434 "Send implementation ID with NFSv4.1 exchange_id"); 1435MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 1436 1437module_param(recover_lost_locks, bool, 0644); 1438MODULE_PARM_DESC(recover_lost_locks, 1439 "If the server reports that a lock might be lost, " 1440 "try to recover it risking data corruption."); 1441 1442module_param_named(delay_retrans, nfs_delay_retrans, short, 0644); 1443MODULE_PARM_DESC(delay_retrans, 1444 "Unless negative, specifies the number of times the NFSv4 " 1445 "client retries a request before returning an EAGAIN error, " 1446 "after a reply of NFS4ERR_DELAY from the server."); 1447#endif /* CONFIG_NFS_V4 */ 1448