1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/smp_lock.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/nfs_idmap.h> 46 #include <linux/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <net/ipv6.h> 50 #include <linux/nfs_xdr.h> 51 #include <linux/magic.h> 52 #include <linux/parser.h> 53 54 #include <asm/system.h> 55 #include <asm/uaccess.h> 56 57 #include "nfs4_fs.h" 58 #include "callback.h" 59 #include "delegation.h" 60 #include "iostat.h" 61 #include "internal.h" 62 63 #define NFSDBG_FACILITY NFSDBG_VFS 64 65 enum { 66 /* Mount options that take no arguments */ 67 Opt_soft, Opt_hard, 68 Opt_intr, Opt_nointr, 69 Opt_posix, Opt_noposix, 70 Opt_cto, Opt_nocto, 71 Opt_ac, Opt_noac, 72 Opt_lock, Opt_nolock, 73 Opt_v2, Opt_v3, 74 Opt_udp, Opt_tcp, Opt_rdma, 75 Opt_acl, Opt_noacl, 76 Opt_rdirplus, Opt_nordirplus, 77 Opt_sharecache, Opt_nosharecache, 78 79 /* Mount options that take integer arguments */ 80 Opt_port, 81 Opt_rsize, Opt_wsize, Opt_bsize, 82 Opt_timeo, Opt_retrans, 83 Opt_acregmin, Opt_acregmax, 84 Opt_acdirmin, Opt_acdirmax, 85 Opt_actimeo, 86 Opt_namelen, 87 Opt_mountport, 88 Opt_mountvers, 89 Opt_nfsvers, 90 91 /* Mount options that take string arguments */ 92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 93 Opt_addr, Opt_mountaddr, Opt_clientaddr, 94 95 /* Mount options that are ignored */ 96 Opt_userspace, Opt_deprecated, 97 98 Opt_err 99 }; 100 101 static match_table_t nfs_mount_option_tokens = { 102 { Opt_userspace, "bg" }, 103 { Opt_userspace, "fg" }, 104 { Opt_soft, "soft" }, 105 { Opt_hard, "hard" }, 106 { Opt_intr, "intr" }, 107 { Opt_nointr, "nointr" }, 108 { Opt_posix, "posix" }, 109 { Opt_noposix, "noposix" }, 110 { Opt_cto, "cto" }, 111 { Opt_nocto, "nocto" }, 112 { Opt_ac, "ac" }, 113 { Opt_noac, "noac" }, 114 { Opt_lock, "lock" }, 115 { Opt_nolock, "nolock" }, 116 { Opt_v2, "v2" }, 117 { Opt_v3, "v3" }, 118 { Opt_udp, "udp" }, 119 { Opt_tcp, "tcp" }, 120 { Opt_rdma, "rdma" }, 121 { Opt_acl, "acl" }, 122 { Opt_noacl, "noacl" }, 123 { Opt_rdirplus, "rdirplus" }, 124 { Opt_nordirplus, "nordirplus" }, 125 { Opt_sharecache, "sharecache" }, 126 { Opt_nosharecache, "nosharecache" }, 127 128 { Opt_port, "port=%u" }, 129 { Opt_rsize, "rsize=%u" }, 130 { Opt_wsize, "wsize=%u" }, 131 { Opt_bsize, "bsize=%u" }, 132 { Opt_timeo, "timeo=%u" }, 133 { Opt_retrans, "retrans=%u" }, 134 { Opt_acregmin, "acregmin=%u" }, 135 { Opt_acregmax, "acregmax=%u" }, 136 { Opt_acdirmin, "acdirmin=%u" }, 137 { Opt_acdirmax, "acdirmax=%u" }, 138 { Opt_actimeo, "actimeo=%u" }, 139 { Opt_userspace, "retry=%u" }, 140 { Opt_namelen, "namlen=%u" }, 141 { Opt_mountport, "mountport=%u" }, 142 { Opt_mountvers, "mountvers=%u" }, 143 { Opt_nfsvers, "nfsvers=%u" }, 144 { Opt_nfsvers, "vers=%u" }, 145 146 { Opt_sec, "sec=%s" }, 147 { Opt_proto, "proto=%s" }, 148 { Opt_mountproto, "mountproto=%s" }, 149 { Opt_addr, "addr=%s" }, 150 { Opt_clientaddr, "clientaddr=%s" }, 151 { Opt_mounthost, "mounthost=%s" }, 152 { Opt_mountaddr, "mountaddr=%s" }, 153 154 { Opt_err, NULL } 155 }; 156 157 enum { 158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, 159 160 Opt_xprt_err 161 }; 162 163 static match_table_t nfs_xprt_protocol_tokens = { 164 { Opt_xprt_udp, "udp" }, 165 { Opt_xprt_tcp, "tcp" }, 166 { Opt_xprt_rdma, "rdma" }, 167 168 { Opt_xprt_err, NULL } 169 }; 170 171 enum { 172 Opt_sec_none, Opt_sec_sys, 173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 176 177 Opt_sec_err 178 }; 179 180 static match_table_t nfs_secflavor_tokens = { 181 { Opt_sec_none, "none" }, 182 { Opt_sec_none, "null" }, 183 { Opt_sec_sys, "sys" }, 184 185 { Opt_sec_krb5, "krb5" }, 186 { Opt_sec_krb5i, "krb5i" }, 187 { Opt_sec_krb5p, "krb5p" }, 188 189 { Opt_sec_lkey, "lkey" }, 190 { Opt_sec_lkeyi, "lkeyi" }, 191 { Opt_sec_lkeyp, "lkeyp" }, 192 193 { Opt_sec_err, NULL } 194 }; 195 196 197 static void nfs_umount_begin(struct vfsmount *, int); 198 static int nfs_statfs(struct dentry *, struct kstatfs *); 199 static int nfs_show_options(struct seq_file *, struct vfsmount *); 200 static int nfs_show_stats(struct seq_file *, struct vfsmount *); 201 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); 202 static int nfs_xdev_get_sb(struct file_system_type *fs_type, 203 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 204 static void nfs_kill_super(struct super_block *); 205 static void nfs_put_super(struct super_block *); 206 207 static struct file_system_type nfs_fs_type = { 208 .owner = THIS_MODULE, 209 .name = "nfs", 210 .get_sb = nfs_get_sb, 211 .kill_sb = nfs_kill_super, 212 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 213 }; 214 215 struct file_system_type nfs_xdev_fs_type = { 216 .owner = THIS_MODULE, 217 .name = "nfs", 218 .get_sb = nfs_xdev_get_sb, 219 .kill_sb = nfs_kill_super, 220 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 221 }; 222 223 static const struct super_operations nfs_sops = { 224 .alloc_inode = nfs_alloc_inode, 225 .destroy_inode = nfs_destroy_inode, 226 .write_inode = nfs_write_inode, 227 .put_super = nfs_put_super, 228 .statfs = nfs_statfs, 229 .clear_inode = nfs_clear_inode, 230 .umount_begin = nfs_umount_begin, 231 .show_options = nfs_show_options, 232 .show_stats = nfs_show_stats, 233 }; 234 235 #ifdef CONFIG_NFS_V4 236 static int nfs4_get_sb(struct file_system_type *fs_type, 237 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 238 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, 239 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 240 static int nfs4_referral_get_sb(struct file_system_type *fs_type, 241 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); 242 static void nfs4_kill_super(struct super_block *sb); 243 244 static struct file_system_type nfs4_fs_type = { 245 .owner = THIS_MODULE, 246 .name = "nfs4", 247 .get_sb = nfs4_get_sb, 248 .kill_sb = nfs4_kill_super, 249 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 250 }; 251 252 struct file_system_type nfs4_xdev_fs_type = { 253 .owner = THIS_MODULE, 254 .name = "nfs4", 255 .get_sb = nfs4_xdev_get_sb, 256 .kill_sb = nfs4_kill_super, 257 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 258 }; 259 260 struct file_system_type nfs4_referral_fs_type = { 261 .owner = THIS_MODULE, 262 .name = "nfs4", 263 .get_sb = nfs4_referral_get_sb, 264 .kill_sb = nfs4_kill_super, 265 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 266 }; 267 268 static const struct super_operations nfs4_sops = { 269 .alloc_inode = nfs_alloc_inode, 270 .destroy_inode = nfs_destroy_inode, 271 .write_inode = nfs_write_inode, 272 .statfs = nfs_statfs, 273 .clear_inode = nfs4_clear_inode, 274 .umount_begin = nfs_umount_begin, 275 .show_options = nfs_show_options, 276 .show_stats = nfs_show_stats, 277 }; 278 #endif 279 280 static struct shrinker acl_shrinker = { 281 .shrink = nfs_access_cache_shrinker, 282 .seeks = DEFAULT_SEEKS, 283 }; 284 285 /* 286 * Register the NFS filesystems 287 */ 288 int __init register_nfs_fs(void) 289 { 290 int ret; 291 292 ret = register_filesystem(&nfs_fs_type); 293 if (ret < 0) 294 goto error_0; 295 296 ret = nfs_register_sysctl(); 297 if (ret < 0) 298 goto error_1; 299 #ifdef CONFIG_NFS_V4 300 ret = register_filesystem(&nfs4_fs_type); 301 if (ret < 0) 302 goto error_2; 303 #endif 304 register_shrinker(&acl_shrinker); 305 return 0; 306 307 #ifdef CONFIG_NFS_V4 308 error_2: 309 nfs_unregister_sysctl(); 310 #endif 311 error_1: 312 unregister_filesystem(&nfs_fs_type); 313 error_0: 314 return ret; 315 } 316 317 /* 318 * Unregister the NFS filesystems 319 */ 320 void __exit unregister_nfs_fs(void) 321 { 322 unregister_shrinker(&acl_shrinker); 323 #ifdef CONFIG_NFS_V4 324 unregister_filesystem(&nfs4_fs_type); 325 #endif 326 nfs_unregister_sysctl(); 327 unregister_filesystem(&nfs_fs_type); 328 } 329 330 void nfs_sb_active(struct nfs_server *server) 331 { 332 atomic_inc(&server->active); 333 } 334 335 void nfs_sb_deactive(struct nfs_server *server) 336 { 337 if (atomic_dec_and_test(&server->active)) 338 wake_up(&server->active_wq); 339 } 340 341 static void nfs_put_super(struct super_block *sb) 342 { 343 struct nfs_server *server = NFS_SB(sb); 344 /* 345 * Make sure there are no outstanding ops to this server. 346 * If so, wait for them to finish before allowing the 347 * unmount to continue. 348 */ 349 wait_event(server->active_wq, atomic_read(&server->active) == 0); 350 } 351 352 /* 353 * Deliver file system statistics to userspace 354 */ 355 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 356 { 357 struct nfs_server *server = NFS_SB(dentry->d_sb); 358 unsigned char blockbits; 359 unsigned long blockres; 360 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 361 struct nfs_fattr fattr; 362 struct nfs_fsstat res = { 363 .fattr = &fattr, 364 }; 365 int error; 366 367 lock_kernel(); 368 369 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 370 if (error < 0) 371 goto out_err; 372 buf->f_type = NFS_SUPER_MAGIC; 373 374 /* 375 * Current versions of glibc do not correctly handle the 376 * case where f_frsize != f_bsize. Eventually we want to 377 * report the value of wtmult in this field. 378 */ 379 buf->f_frsize = dentry->d_sb->s_blocksize; 380 381 /* 382 * On most *nix systems, f_blocks, f_bfree, and f_bavail 383 * are reported in units of f_frsize. Linux hasn't had 384 * an f_frsize field in its statfs struct until recently, 385 * thus historically Linux's sys_statfs reports these 386 * fields in units of f_bsize. 387 */ 388 buf->f_bsize = dentry->d_sb->s_blocksize; 389 blockbits = dentry->d_sb->s_blocksize_bits; 390 blockres = (1 << blockbits) - 1; 391 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 392 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 393 buf->f_bavail = (res.abytes + blockres) >> blockbits; 394 395 buf->f_files = res.tfiles; 396 buf->f_ffree = res.afiles; 397 398 buf->f_namelen = server->namelen; 399 400 unlock_kernel(); 401 return 0; 402 403 out_err: 404 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); 405 unlock_kernel(); 406 return error; 407 } 408 409 /* 410 * Map the security flavour number to a name 411 */ 412 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 413 { 414 static const struct { 415 rpc_authflavor_t flavour; 416 const char *str; 417 } sec_flavours[] = { 418 { RPC_AUTH_NULL, "null" }, 419 { RPC_AUTH_UNIX, "sys" }, 420 { RPC_AUTH_GSS_KRB5, "krb5" }, 421 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 422 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 423 { RPC_AUTH_GSS_LKEY, "lkey" }, 424 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 425 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 426 { RPC_AUTH_GSS_SPKM, "spkm" }, 427 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 428 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 429 { UINT_MAX, "unknown" } 430 }; 431 int i; 432 433 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 434 if (sec_flavours[i].flavour == flavour) 435 break; 436 } 437 return sec_flavours[i].str; 438 } 439 440 /* 441 * Describe the mount options in force on this server representation 442 */ 443 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) 444 { 445 static const struct proc_nfs_info { 446 int flag; 447 const char *str; 448 const char *nostr; 449 } nfs_info[] = { 450 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 451 { NFS_MOUNT_NOCTO, ",nocto", "" }, 452 { NFS_MOUNT_NOAC, ",noac", "" }, 453 { NFS_MOUNT_NONLM, ",nolock", "" }, 454 { NFS_MOUNT_NOACL, ",noacl", "" }, 455 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 456 { NFS_MOUNT_UNSHARED, ",nosharecache", ""}, 457 { 0, NULL, NULL } 458 }; 459 const struct proc_nfs_info *nfs_infop; 460 struct nfs_client *clp = nfss->nfs_client; 461 462 seq_printf(m, ",vers=%d", clp->rpc_ops->version); 463 seq_printf(m, ",rsize=%d", nfss->rsize); 464 seq_printf(m, ",wsize=%d", nfss->wsize); 465 if (nfss->acregmin != 3*HZ || showdefaults) 466 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); 467 if (nfss->acregmax != 60*HZ || showdefaults) 468 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); 469 if (nfss->acdirmin != 30*HZ || showdefaults) 470 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); 471 if (nfss->acdirmax != 60*HZ || showdefaults) 472 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); 473 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 474 if (nfss->flags & nfs_infop->flag) 475 seq_puts(m, nfs_infop->str); 476 else 477 seq_puts(m, nfs_infop->nostr); 478 } 479 seq_printf(m, ",proto=%s", 480 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); 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 } 485 486 /* 487 * Describe the mount options on this VFS mountpoint 488 */ 489 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 490 { 491 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 492 493 nfs_show_mount_options(m, nfss, 0); 494 495 seq_printf(m, ",addr=%s", 496 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 497 RPC_DISPLAY_ADDR)); 498 499 return 0; 500 } 501 502 /* 503 * Present statistical information for this VFS mountpoint 504 */ 505 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) 506 { 507 int i, cpu; 508 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 509 struct rpc_auth *auth = nfss->client->cl_auth; 510 struct nfs_iostats totals = { }; 511 512 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 513 514 /* 515 * Display all mount option settings 516 */ 517 seq_printf(m, "\n\topts:\t"); 518 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 519 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 520 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 521 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 522 nfs_show_mount_options(m, nfss, 1); 523 524 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 525 526 seq_printf(m, "\n\tcaps:\t"); 527 seq_printf(m, "caps=0x%x", nfss->caps); 528 seq_printf(m, ",wtmult=%d", nfss->wtmult); 529 seq_printf(m, ",dtsize=%d", nfss->dtsize); 530 seq_printf(m, ",bsize=%d", nfss->bsize); 531 seq_printf(m, ",namelen=%d", nfss->namelen); 532 533 #ifdef CONFIG_NFS_V4 534 if (nfss->nfs_client->rpc_ops->version == 4) { 535 seq_printf(m, "\n\tnfsv4:\t"); 536 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 537 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 538 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 539 } 540 #endif 541 542 /* 543 * Display security flavor in effect for this mount 544 */ 545 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); 546 if (auth->au_flavor) 547 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); 548 549 /* 550 * Display superblock I/O counters 551 */ 552 for_each_possible_cpu(cpu) { 553 struct nfs_iostats *stats; 554 555 preempt_disable(); 556 stats = per_cpu_ptr(nfss->io_stats, cpu); 557 558 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 559 totals.events[i] += stats->events[i]; 560 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 561 totals.bytes[i] += stats->bytes[i]; 562 563 preempt_enable(); 564 } 565 566 seq_printf(m, "\n\tevents:\t"); 567 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 568 seq_printf(m, "%lu ", totals.events[i]); 569 seq_printf(m, "\n\tbytes:\t"); 570 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 571 seq_printf(m, "%Lu ", totals.bytes[i]); 572 seq_printf(m, "\n"); 573 574 rpc_print_iostats(m, nfss->client); 575 576 return 0; 577 } 578 579 /* 580 * Begin unmount by attempting to remove all automounted mountpoints we added 581 * in response to xdev traversals and referrals 582 */ 583 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) 584 { 585 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb); 586 struct rpc_clnt *rpc; 587 588 shrink_submounts(vfsmnt, &nfs_automount_list); 589 590 if (!(flags & MNT_FORCE)) 591 return; 592 /* -EIO all pending I/O */ 593 rpc = server->client_acl; 594 if (!IS_ERR(rpc)) 595 rpc_killall_tasks(rpc); 596 rpc = server->client; 597 if (!IS_ERR(rpc)) 598 rpc_killall_tasks(rpc); 599 } 600 601 /* 602 * Set the port number in an address. Be agnostic about the address family. 603 */ 604 static void nfs_set_port(struct sockaddr *sap, unsigned short port) 605 { 606 switch (sap->sa_family) { 607 case AF_INET: { 608 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 609 ap->sin_port = htons(port); 610 break; 611 } 612 case AF_INET6: { 613 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; 614 ap->sin6_port = htons(port); 615 break; 616 } 617 } 618 } 619 620 /* 621 * Sanity-check a server address provided by the mount command. 622 * 623 * Address family must be initialized, and address must not be 624 * the ANY address for that family. 625 */ 626 static int nfs_verify_server_address(struct sockaddr *addr) 627 { 628 switch (addr->sa_family) { 629 case AF_INET: { 630 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 631 return sa->sin_addr.s_addr != INADDR_ANY; 632 } 633 case AF_INET6: { 634 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 635 return !ipv6_addr_any(sa); 636 } 637 } 638 639 return 0; 640 } 641 642 /* 643 * Parse string addresses passed in via a mount option, 644 * and construct a sockaddr based on the result. 645 * 646 * If address parsing fails, set the sockaddr's address 647 * family to AF_UNSPEC to force nfs_verify_server_address() 648 * to punt the mount. 649 */ 650 static void nfs_parse_server_address(char *value, 651 struct sockaddr *sap, 652 size_t *len) 653 { 654 if (strchr(value, ':')) { 655 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; 656 u8 *addr = (u8 *)&ap->sin6_addr.in6_u; 657 658 ap->sin6_family = AF_INET6; 659 *len = sizeof(*ap); 660 if (in6_pton(value, -1, addr, '\0', NULL)) 661 return; 662 } else { 663 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 664 u8 *addr = (u8 *)&ap->sin_addr.s_addr; 665 666 ap->sin_family = AF_INET; 667 *len = sizeof(*ap); 668 if (in4_pton(value, -1, addr, '\0', NULL)) 669 return; 670 } 671 672 sap->sa_family = AF_UNSPEC; 673 *len = 0; 674 } 675 676 /* 677 * Error-check and convert a string of mount options from user space into 678 * a data structure 679 */ 680 static int nfs_parse_mount_options(char *raw, 681 struct nfs_parsed_mount_data *mnt) 682 { 683 char *p, *string; 684 unsigned short port = 0; 685 686 if (!raw) { 687 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 688 return 1; 689 } 690 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 691 692 while ((p = strsep(&raw, ",")) != NULL) { 693 substring_t args[MAX_OPT_ARGS]; 694 int option, token; 695 696 if (!*p) 697 continue; 698 699 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 700 701 token = match_token(p, nfs_mount_option_tokens, args); 702 switch (token) { 703 case Opt_soft: 704 mnt->flags |= NFS_MOUNT_SOFT; 705 break; 706 case Opt_hard: 707 mnt->flags &= ~NFS_MOUNT_SOFT; 708 break; 709 case Opt_intr: 710 case Opt_nointr: 711 break; 712 case Opt_posix: 713 mnt->flags |= NFS_MOUNT_POSIX; 714 break; 715 case Opt_noposix: 716 mnt->flags &= ~NFS_MOUNT_POSIX; 717 break; 718 case Opt_cto: 719 mnt->flags &= ~NFS_MOUNT_NOCTO; 720 break; 721 case Opt_nocto: 722 mnt->flags |= NFS_MOUNT_NOCTO; 723 break; 724 case Opt_ac: 725 mnt->flags &= ~NFS_MOUNT_NOAC; 726 break; 727 case Opt_noac: 728 mnt->flags |= NFS_MOUNT_NOAC; 729 break; 730 case Opt_lock: 731 mnt->flags &= ~NFS_MOUNT_NONLM; 732 break; 733 case Opt_nolock: 734 mnt->flags |= NFS_MOUNT_NONLM; 735 break; 736 case Opt_v2: 737 mnt->flags &= ~NFS_MOUNT_VER3; 738 break; 739 case Opt_v3: 740 mnt->flags |= NFS_MOUNT_VER3; 741 break; 742 case Opt_udp: 743 mnt->flags &= ~NFS_MOUNT_TCP; 744 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 745 mnt->timeo = 7; 746 mnt->retrans = 5; 747 break; 748 case Opt_tcp: 749 mnt->flags |= NFS_MOUNT_TCP; 750 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 751 mnt->timeo = 600; 752 mnt->retrans = 2; 753 break; 754 case Opt_rdma: 755 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 756 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 757 mnt->timeo = 600; 758 mnt->retrans = 2; 759 break; 760 case Opt_acl: 761 mnt->flags &= ~NFS_MOUNT_NOACL; 762 break; 763 case Opt_noacl: 764 mnt->flags |= NFS_MOUNT_NOACL; 765 break; 766 case Opt_rdirplus: 767 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 768 break; 769 case Opt_nordirplus: 770 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 771 break; 772 case Opt_sharecache: 773 mnt->flags &= ~NFS_MOUNT_UNSHARED; 774 break; 775 case Opt_nosharecache: 776 mnt->flags |= NFS_MOUNT_UNSHARED; 777 break; 778 779 case Opt_port: 780 if (match_int(args, &option)) 781 return 0; 782 if (option < 0 || option > 65535) 783 return 0; 784 port = option; 785 break; 786 case Opt_rsize: 787 if (match_int(args, &mnt->rsize)) 788 return 0; 789 break; 790 case Opt_wsize: 791 if (match_int(args, &mnt->wsize)) 792 return 0; 793 break; 794 case Opt_bsize: 795 if (match_int(args, &option)) 796 return 0; 797 if (option < 0) 798 return 0; 799 mnt->bsize = option; 800 break; 801 case Opt_timeo: 802 if (match_int(args, &mnt->timeo)) 803 return 0; 804 break; 805 case Opt_retrans: 806 if (match_int(args, &mnt->retrans)) 807 return 0; 808 break; 809 case Opt_acregmin: 810 if (match_int(args, &mnt->acregmin)) 811 return 0; 812 break; 813 case Opt_acregmax: 814 if (match_int(args, &mnt->acregmax)) 815 return 0; 816 break; 817 case Opt_acdirmin: 818 if (match_int(args, &mnt->acdirmin)) 819 return 0; 820 break; 821 case Opt_acdirmax: 822 if (match_int(args, &mnt->acdirmax)) 823 return 0; 824 break; 825 case Opt_actimeo: 826 if (match_int(args, &option)) 827 return 0; 828 if (option < 0) 829 return 0; 830 mnt->acregmin = 831 mnt->acregmax = 832 mnt->acdirmin = 833 mnt->acdirmax = option; 834 break; 835 case Opt_namelen: 836 if (match_int(args, &mnt->namlen)) 837 return 0; 838 break; 839 case Opt_mountport: 840 if (match_int(args, &option)) 841 return 0; 842 if (option < 0 || option > 65535) 843 return 0; 844 mnt->mount_server.port = option; 845 break; 846 case Opt_mountvers: 847 if (match_int(args, &option)) 848 return 0; 849 if (option < 0) 850 return 0; 851 mnt->mount_server.version = option; 852 break; 853 case Opt_nfsvers: 854 if (match_int(args, &option)) 855 return 0; 856 switch (option) { 857 case 2: 858 mnt->flags &= ~NFS_MOUNT_VER3; 859 break; 860 case 3: 861 mnt->flags |= NFS_MOUNT_VER3; 862 break; 863 default: 864 goto out_unrec_vers; 865 } 866 break; 867 868 case Opt_sec: 869 string = match_strdup(args); 870 if (string == NULL) 871 goto out_nomem; 872 token = match_token(string, nfs_secflavor_tokens, args); 873 kfree(string); 874 875 /* 876 * The flags setting is for v2/v3. The flavor_len 877 * setting is for v4. v2/v3 also need to know the 878 * difference between NULL and UNIX. 879 */ 880 switch (token) { 881 case Opt_sec_none: 882 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; 883 mnt->auth_flavor_len = 0; 884 mnt->auth_flavors[0] = RPC_AUTH_NULL; 885 break; 886 case Opt_sec_sys: 887 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; 888 mnt->auth_flavor_len = 0; 889 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 890 break; 891 case Opt_sec_krb5: 892 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 893 mnt->auth_flavor_len = 1; 894 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 895 break; 896 case Opt_sec_krb5i: 897 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 898 mnt->auth_flavor_len = 1; 899 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 900 break; 901 case Opt_sec_krb5p: 902 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 903 mnt->auth_flavor_len = 1; 904 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 905 break; 906 case Opt_sec_lkey: 907 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 908 mnt->auth_flavor_len = 1; 909 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 910 break; 911 case Opt_sec_lkeyi: 912 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 913 mnt->auth_flavor_len = 1; 914 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 915 break; 916 case Opt_sec_lkeyp: 917 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 918 mnt->auth_flavor_len = 1; 919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 920 break; 921 case Opt_sec_spkm: 922 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 923 mnt->auth_flavor_len = 1; 924 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 925 break; 926 case Opt_sec_spkmi: 927 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 928 mnt->auth_flavor_len = 1; 929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 930 break; 931 case Opt_sec_spkmp: 932 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 933 mnt->auth_flavor_len = 1; 934 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 935 break; 936 default: 937 goto out_unrec_sec; 938 } 939 break; 940 case Opt_proto: 941 string = match_strdup(args); 942 if (string == NULL) 943 goto out_nomem; 944 token = match_token(string, 945 nfs_xprt_protocol_tokens, args); 946 kfree(string); 947 948 switch (token) { 949 case Opt_xprt_udp: 950 mnt->flags &= ~NFS_MOUNT_TCP; 951 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 952 mnt->timeo = 7; 953 mnt->retrans = 5; 954 break; 955 case Opt_xprt_tcp: 956 mnt->flags |= NFS_MOUNT_TCP; 957 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 958 mnt->timeo = 600; 959 mnt->retrans = 2; 960 break; 961 case Opt_xprt_rdma: 962 /* vector side protocols to TCP */ 963 mnt->flags |= NFS_MOUNT_TCP; 964 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 965 mnt->timeo = 600; 966 mnt->retrans = 2; 967 break; 968 default: 969 goto out_unrec_xprt; 970 } 971 break; 972 case Opt_mountproto: 973 string = match_strdup(args); 974 if (string == NULL) 975 goto out_nomem; 976 token = match_token(string, 977 nfs_xprt_protocol_tokens, args); 978 kfree(string); 979 980 switch (token) { 981 case Opt_xprt_udp: 982 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 983 break; 984 case Opt_xprt_tcp: 985 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 986 break; 987 case Opt_xprt_rdma: /* not used for side protocols */ 988 default: 989 goto out_unrec_xprt; 990 } 991 break; 992 case Opt_addr: 993 string = match_strdup(args); 994 if (string == NULL) 995 goto out_nomem; 996 nfs_parse_server_address(string, (struct sockaddr *) 997 &mnt->nfs_server.address, 998 &mnt->nfs_server.addrlen); 999 kfree(string); 1000 break; 1001 case Opt_clientaddr: 1002 string = match_strdup(args); 1003 if (string == NULL) 1004 goto out_nomem; 1005 kfree(mnt->client_address); 1006 mnt->client_address = string; 1007 break; 1008 case Opt_mounthost: 1009 string = match_strdup(args); 1010 if (string == NULL) 1011 goto out_nomem; 1012 kfree(mnt->mount_server.hostname); 1013 mnt->mount_server.hostname = string; 1014 break; 1015 case Opt_mountaddr: 1016 string = match_strdup(args); 1017 if (string == NULL) 1018 goto out_nomem; 1019 nfs_parse_server_address(string, (struct sockaddr *) 1020 &mnt->mount_server.address, 1021 &mnt->mount_server.addrlen); 1022 kfree(string); 1023 break; 1024 1025 case Opt_userspace: 1026 case Opt_deprecated: 1027 break; 1028 1029 default: 1030 goto out_unknown; 1031 } 1032 } 1033 1034 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port); 1035 1036 return 1; 1037 1038 out_nomem: 1039 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1040 return 0; 1041 1042 out_unrec_vers: 1043 printk(KERN_INFO "NFS: unrecognized NFS version number\n"); 1044 return 0; 1045 1046 out_unrec_xprt: 1047 printk(KERN_INFO "NFS: unrecognized transport protocol\n"); 1048 return 0; 1049 1050 out_unrec_sec: 1051 printk(KERN_INFO "NFS: unrecognized security flavor\n"); 1052 return 0; 1053 1054 out_unknown: 1055 printk(KERN_INFO "NFS: unknown mount option: %s\n", p); 1056 return 0; 1057 } 1058 1059 /* 1060 * Use the remote server's MOUNT service to request the NFS file handle 1061 * corresponding to the provided path. 1062 */ 1063 static int nfs_try_mount(struct nfs_parsed_mount_data *args, 1064 struct nfs_fh *root_fh) 1065 { 1066 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address; 1067 char *hostname; 1068 int status; 1069 1070 if (args->mount_server.version == 0) { 1071 if (args->flags & NFS_MOUNT_VER3) 1072 args->mount_server.version = NFS_MNT3_VERSION; 1073 else 1074 args->mount_server.version = NFS_MNT_VERSION; 1075 } 1076 1077 if (args->mount_server.hostname) 1078 hostname = args->mount_server.hostname; 1079 else 1080 hostname = args->nfs_server.hostname; 1081 1082 /* 1083 * Construct the mount server's address. 1084 */ 1085 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1086 memcpy(sap, &args->nfs_server.address, 1087 args->nfs_server.addrlen); 1088 args->mount_server.addrlen = args->nfs_server.addrlen; 1089 } 1090 1091 /* 1092 * autobind will be used if mount_server.port == 0 1093 */ 1094 nfs_set_port(sap, args->mount_server.port); 1095 1096 /* 1097 * Now ask the mount server to map our export path 1098 * to a file handle. 1099 */ 1100 status = nfs_mount(sap, 1101 args->mount_server.addrlen, 1102 hostname, 1103 args->nfs_server.export_path, 1104 args->mount_server.version, 1105 args->mount_server.protocol, 1106 root_fh); 1107 if (status == 0) 1108 return 0; 1109 1110 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d", 1111 hostname, status); 1112 return status; 1113 } 1114 1115 /* 1116 * Validate the NFS2/NFS3 mount data 1117 * - fills in the mount root filehandle 1118 * 1119 * For option strings, user space handles the following behaviors: 1120 * 1121 * + DNS: mapping server host name to IP address ("addr=" option) 1122 * 1123 * + failure mode: how to behave if a mount request can't be handled 1124 * immediately ("fg/bg" option) 1125 * 1126 * + retry: how often to retry a mount request ("retry=" option) 1127 * 1128 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1129 * mountproto=tcp after mountproto=udp, and so on 1130 */ 1131 static int nfs_validate_mount_data(void *options, 1132 struct nfs_parsed_mount_data *args, 1133 struct nfs_fh *mntfh, 1134 const char *dev_name) 1135 { 1136 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1137 1138 memset(args, 0, sizeof(*args)); 1139 1140 if (data == NULL) 1141 goto out_no_data; 1142 1143 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); 1144 args->rsize = NFS_MAX_FILE_IO_SIZE; 1145 args->wsize = NFS_MAX_FILE_IO_SIZE; 1146 args->timeo = 600; 1147 args->retrans = 2; 1148 args->acregmin = 3; 1149 args->acregmax = 60; 1150 args->acdirmin = 30; 1151 args->acdirmax = 60; 1152 args->mount_server.protocol = XPRT_TRANSPORT_UDP; 1153 args->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1154 1155 switch (data->version) { 1156 case 1: 1157 data->namlen = 0; 1158 case 2: 1159 data->bsize = 0; 1160 case 3: 1161 if (data->flags & NFS_MOUNT_VER3) 1162 goto out_no_v3; 1163 data->root.size = NFS2_FHSIZE; 1164 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1165 case 4: 1166 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1167 goto out_no_sec; 1168 case 5: 1169 memset(data->context, 0, sizeof(data->context)); 1170 case 6: 1171 if (data->flags & NFS_MOUNT_VER3) 1172 mntfh->size = data->root.size; 1173 else 1174 mntfh->size = NFS2_FHSIZE; 1175 1176 if (mntfh->size > sizeof(mntfh->data)) 1177 goto out_invalid_fh; 1178 1179 memcpy(mntfh->data, data->root.data, mntfh->size); 1180 if (mntfh->size < sizeof(mntfh->data)) 1181 memset(mntfh->data + mntfh->size, 0, 1182 sizeof(mntfh->data) - mntfh->size); 1183 1184 /* 1185 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1186 * can deal with. 1187 */ 1188 args->flags = data->flags; 1189 args->rsize = data->rsize; 1190 args->wsize = data->wsize; 1191 args->flags = data->flags; 1192 args->timeo = data->timeo; 1193 args->retrans = data->retrans; 1194 args->acregmin = data->acregmin; 1195 args->acregmax = data->acregmax; 1196 args->acdirmin = data->acdirmin; 1197 args->acdirmax = data->acdirmax; 1198 1199 memcpy(&args->nfs_server.address, &data->addr, 1200 sizeof(data->addr)); 1201 args->nfs_server.addrlen = sizeof(data->addr); 1202 if (!nfs_verify_server_address((struct sockaddr *) 1203 &args->nfs_server.address)) 1204 goto out_no_address; 1205 1206 if (!(data->flags & NFS_MOUNT_TCP)) 1207 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1208 /* N.B. caller will free nfs_server.hostname in all cases */ 1209 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1210 args->namlen = data->namlen; 1211 args->bsize = data->bsize; 1212 args->auth_flavors[0] = data->pseudoflavor; 1213 break; 1214 default: { 1215 unsigned int len; 1216 char *c; 1217 int status; 1218 1219 if (nfs_parse_mount_options((char *)options, args) == 0) 1220 return -EINVAL; 1221 1222 if (!nfs_verify_server_address((struct sockaddr *) 1223 &args->nfs_server.address)) 1224 goto out_no_address; 1225 1226 c = strchr(dev_name, ':'); 1227 if (c == NULL) 1228 return -EINVAL; 1229 len = c - dev_name; 1230 /* N.B. caller will free nfs_server.hostname in all cases */ 1231 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); 1232 1233 c++; 1234 if (strlen(c) > NFS_MAXPATHLEN) 1235 return -ENAMETOOLONG; 1236 args->nfs_server.export_path = c; 1237 1238 status = nfs_try_mount(args, mntfh); 1239 if (status) 1240 return status; 1241 1242 break; 1243 } 1244 } 1245 1246 if (!(args->flags & NFS_MOUNT_SECFLAVOUR)) 1247 args->auth_flavors[0] = RPC_AUTH_UNIX; 1248 1249 #ifndef CONFIG_NFS_V3 1250 if (args->flags & NFS_MOUNT_VER3) 1251 goto out_v3_not_compiled; 1252 #endif /* !CONFIG_NFS_V3 */ 1253 1254 return 0; 1255 1256 out_no_data: 1257 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1258 return -EINVAL; 1259 1260 out_no_v3: 1261 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1262 data->version); 1263 return -EINVAL; 1264 1265 out_no_sec: 1266 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1267 return -EINVAL; 1268 1269 #ifndef CONFIG_NFS_V3 1270 out_v3_not_compiled: 1271 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1272 return -EPROTONOSUPPORT; 1273 #endif /* !CONFIG_NFS_V3 */ 1274 1275 out_no_address: 1276 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1277 return -EINVAL; 1278 1279 out_invalid_fh: 1280 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1281 return -EINVAL; 1282 } 1283 1284 /* 1285 * Initialise the common bits of the superblock 1286 */ 1287 static inline void nfs_initialise_sb(struct super_block *sb) 1288 { 1289 struct nfs_server *server = NFS_SB(sb); 1290 1291 sb->s_magic = NFS_SUPER_MAGIC; 1292 1293 /* We probably want something more informative here */ 1294 snprintf(sb->s_id, sizeof(sb->s_id), 1295 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 1296 1297 if (sb->s_blocksize == 0) 1298 sb->s_blocksize = nfs_block_bits(server->wsize, 1299 &sb->s_blocksize_bits); 1300 1301 if (server->flags & NFS_MOUNT_NOAC) 1302 sb->s_flags |= MS_SYNCHRONOUS; 1303 1304 nfs_super_set_maxbytes(sb, server->maxfilesize); 1305 } 1306 1307 /* 1308 * Finish setting up an NFS2/3 superblock 1309 */ 1310 static void nfs_fill_super(struct super_block *sb, 1311 struct nfs_parsed_mount_data *data) 1312 { 1313 struct nfs_server *server = NFS_SB(sb); 1314 1315 sb->s_blocksize_bits = 0; 1316 sb->s_blocksize = 0; 1317 if (data->bsize) 1318 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 1319 1320 if (server->flags & NFS_MOUNT_VER3) { 1321 /* The VFS shouldn't apply the umask to mode bits. We will do 1322 * so ourselves when necessary. 1323 */ 1324 sb->s_flags |= MS_POSIXACL; 1325 sb->s_time_gran = 1; 1326 } 1327 1328 sb->s_op = &nfs_sops; 1329 nfs_initialise_sb(sb); 1330 } 1331 1332 /* 1333 * Finish setting up a cloned NFS2/3 superblock 1334 */ 1335 static void nfs_clone_super(struct super_block *sb, 1336 const struct super_block *old_sb) 1337 { 1338 struct nfs_server *server = NFS_SB(sb); 1339 1340 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 1341 sb->s_blocksize = old_sb->s_blocksize; 1342 sb->s_maxbytes = old_sb->s_maxbytes; 1343 1344 if (server->flags & NFS_MOUNT_VER3) { 1345 /* The VFS shouldn't apply the umask to mode bits. We will do 1346 * so ourselves when necessary. 1347 */ 1348 sb->s_flags |= MS_POSIXACL; 1349 sb->s_time_gran = 1; 1350 } 1351 1352 sb->s_op = old_sb->s_op; 1353 nfs_initialise_sb(sb); 1354 } 1355 1356 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 1357 1358 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 1359 { 1360 const struct nfs_server *a = s->s_fs_info; 1361 const struct rpc_clnt *clnt_a = a->client; 1362 const struct rpc_clnt *clnt_b = b->client; 1363 1364 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 1365 goto Ebusy; 1366 if (a->nfs_client != b->nfs_client) 1367 goto Ebusy; 1368 if (a->flags != b->flags) 1369 goto Ebusy; 1370 if (a->wsize != b->wsize) 1371 goto Ebusy; 1372 if (a->rsize != b->rsize) 1373 goto Ebusy; 1374 if (a->acregmin != b->acregmin) 1375 goto Ebusy; 1376 if (a->acregmax != b->acregmax) 1377 goto Ebusy; 1378 if (a->acdirmin != b->acdirmin) 1379 goto Ebusy; 1380 if (a->acdirmax != b->acdirmax) 1381 goto Ebusy; 1382 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 1383 goto Ebusy; 1384 return 1; 1385 Ebusy: 1386 return 0; 1387 } 1388 1389 struct nfs_sb_mountdata { 1390 struct nfs_server *server; 1391 int mntflags; 1392 }; 1393 1394 static int nfs_set_super(struct super_block *s, void *data) 1395 { 1396 struct nfs_sb_mountdata *sb_mntdata = data; 1397 struct nfs_server *server = sb_mntdata->server; 1398 int ret; 1399 1400 s->s_flags = sb_mntdata->mntflags; 1401 s->s_fs_info = server; 1402 ret = set_anon_super(s, server); 1403 if (ret == 0) 1404 server->s_dev = s->s_dev; 1405 return ret; 1406 } 1407 1408 static int nfs_compare_super_address(struct nfs_server *server1, 1409 struct nfs_server *server2) 1410 { 1411 struct sockaddr *sap1, *sap2; 1412 1413 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 1414 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 1415 1416 if (sap1->sa_family != sap2->sa_family) 1417 return 0; 1418 1419 switch (sap1->sa_family) { 1420 case AF_INET: { 1421 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 1422 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 1423 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 1424 return 0; 1425 if (sin1->sin_port != sin2->sin_port) 1426 return 0; 1427 break; 1428 } 1429 case AF_INET6: { 1430 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 1431 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 1432 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 1433 return 0; 1434 if (sin1->sin6_port != sin2->sin6_port) 1435 return 0; 1436 break; 1437 } 1438 default: 1439 return 0; 1440 } 1441 1442 return 1; 1443 } 1444 1445 static int nfs_compare_super(struct super_block *sb, void *data) 1446 { 1447 struct nfs_sb_mountdata *sb_mntdata = data; 1448 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 1449 int mntflags = sb_mntdata->mntflags; 1450 1451 if (!nfs_compare_super_address(old, server)) 1452 return 0; 1453 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 1454 if (old->flags & NFS_MOUNT_UNSHARED) 1455 return 0; 1456 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 1457 return 0; 1458 return nfs_compare_mount_options(sb, server, mntflags); 1459 } 1460 1461 static int nfs_get_sb(struct file_system_type *fs_type, 1462 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 1463 { 1464 struct nfs_server *server = NULL; 1465 struct super_block *s; 1466 struct nfs_fh mntfh; 1467 struct nfs_parsed_mount_data data; 1468 struct dentry *mntroot; 1469 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 1470 struct nfs_sb_mountdata sb_mntdata = { 1471 .mntflags = flags, 1472 }; 1473 int error; 1474 1475 /* Validate the mount data */ 1476 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name); 1477 if (error < 0) 1478 goto out; 1479 1480 /* Get a volume representation */ 1481 server = nfs_create_server(&data, &mntfh); 1482 if (IS_ERR(server)) { 1483 error = PTR_ERR(server); 1484 goto out; 1485 } 1486 sb_mntdata.server = server; 1487 1488 if (server->flags & NFS_MOUNT_UNSHARED) 1489 compare_super = NULL; 1490 1491 /* Get a superblock - note that we may end up sharing one that already exists */ 1492 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 1493 if (IS_ERR(s)) { 1494 error = PTR_ERR(s); 1495 goto out_err_nosb; 1496 } 1497 1498 if (s->s_fs_info != server) { 1499 nfs_free_server(server); 1500 server = NULL; 1501 } 1502 1503 if (!s->s_root) { 1504 /* initial superblock/root creation */ 1505 nfs_fill_super(s, &data); 1506 } 1507 1508 mntroot = nfs_get_root(s, &mntfh); 1509 if (IS_ERR(mntroot)) { 1510 error = PTR_ERR(mntroot); 1511 goto error_splat_super; 1512 } 1513 1514 s->s_flags |= MS_ACTIVE; 1515 mnt->mnt_sb = s; 1516 mnt->mnt_root = mntroot; 1517 error = 0; 1518 1519 out: 1520 kfree(data.nfs_server.hostname); 1521 kfree(data.mount_server.hostname); 1522 return error; 1523 1524 out_err_nosb: 1525 nfs_free_server(server); 1526 goto out; 1527 1528 error_splat_super: 1529 up_write(&s->s_umount); 1530 deactivate_super(s); 1531 goto out; 1532 } 1533 1534 /* 1535 * Destroy an NFS2/3 superblock 1536 */ 1537 static void nfs_kill_super(struct super_block *s) 1538 { 1539 struct nfs_server *server = NFS_SB(s); 1540 1541 kill_anon_super(s); 1542 nfs_free_server(server); 1543 } 1544 1545 /* 1546 * Clone an NFS2/3 server record on xdev traversal (FSID-change) 1547 */ 1548 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, 1549 const char *dev_name, void *raw_data, 1550 struct vfsmount *mnt) 1551 { 1552 struct nfs_clone_mount *data = raw_data; 1553 struct super_block *s; 1554 struct nfs_server *server; 1555 struct dentry *mntroot; 1556 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 1557 struct nfs_sb_mountdata sb_mntdata = { 1558 .mntflags = flags, 1559 }; 1560 int error; 1561 1562 dprintk("--> nfs_xdev_get_sb()\n"); 1563 1564 /* create a new volume representation */ 1565 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 1566 if (IS_ERR(server)) { 1567 error = PTR_ERR(server); 1568 goto out_err_noserver; 1569 } 1570 sb_mntdata.server = server; 1571 1572 if (server->flags & NFS_MOUNT_UNSHARED) 1573 compare_super = NULL; 1574 1575 /* Get a superblock - note that we may end up sharing one that already exists */ 1576 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 1577 if (IS_ERR(s)) { 1578 error = PTR_ERR(s); 1579 goto out_err_nosb; 1580 } 1581 1582 if (s->s_fs_info != server) { 1583 nfs_free_server(server); 1584 server = NULL; 1585 } 1586 1587 if (!s->s_root) { 1588 /* initial superblock/root creation */ 1589 nfs_clone_super(s, data->sb); 1590 } 1591 1592 mntroot = nfs_get_root(s, data->fh); 1593 if (IS_ERR(mntroot)) { 1594 error = PTR_ERR(mntroot); 1595 goto error_splat_super; 1596 } 1597 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 1598 dput(mntroot); 1599 error = -ESTALE; 1600 goto error_splat_super; 1601 } 1602 1603 s->s_flags |= MS_ACTIVE; 1604 mnt->mnt_sb = s; 1605 mnt->mnt_root = mntroot; 1606 1607 dprintk("<-- nfs_xdev_get_sb() = 0\n"); 1608 return 0; 1609 1610 out_err_nosb: 1611 nfs_free_server(server); 1612 out_err_noserver: 1613 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); 1614 return error; 1615 1616 error_splat_super: 1617 up_write(&s->s_umount); 1618 deactivate_super(s); 1619 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); 1620 return error; 1621 } 1622 1623 #ifdef CONFIG_NFS_V4 1624 1625 /* 1626 * Finish setting up a cloned NFS4 superblock 1627 */ 1628 static void nfs4_clone_super(struct super_block *sb, 1629 const struct super_block *old_sb) 1630 { 1631 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 1632 sb->s_blocksize = old_sb->s_blocksize; 1633 sb->s_maxbytes = old_sb->s_maxbytes; 1634 sb->s_time_gran = 1; 1635 sb->s_op = old_sb->s_op; 1636 nfs_initialise_sb(sb); 1637 } 1638 1639 /* 1640 * Set up an NFS4 superblock 1641 */ 1642 static void nfs4_fill_super(struct super_block *sb) 1643 { 1644 sb->s_time_gran = 1; 1645 sb->s_op = &nfs4_sops; 1646 nfs_initialise_sb(sb); 1647 } 1648 1649 /* 1650 * If the user didn't specify a port, set the port number to 1651 * the NFS version 4 default port. 1652 */ 1653 static void nfs4_default_port(struct sockaddr *sap) 1654 { 1655 switch (sap->sa_family) { 1656 case AF_INET: { 1657 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 1658 if (ap->sin_port == 0) 1659 ap->sin_port = htons(NFS_PORT); 1660 break; 1661 } 1662 case AF_INET6: { 1663 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; 1664 if (ap->sin6_port == 0) 1665 ap->sin6_port = htons(NFS_PORT); 1666 break; 1667 } 1668 } 1669 } 1670 1671 /* 1672 * Validate NFSv4 mount options 1673 */ 1674 static int nfs4_validate_mount_data(void *options, 1675 struct nfs_parsed_mount_data *args, 1676 const char *dev_name) 1677 { 1678 struct sockaddr_in *ap; 1679 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 1680 char *c; 1681 1682 memset(args, 0, sizeof(*args)); 1683 1684 if (data == NULL) 1685 goto out_no_data; 1686 1687 args->rsize = NFS_MAX_FILE_IO_SIZE; 1688 args->wsize = NFS_MAX_FILE_IO_SIZE; 1689 args->timeo = 600; 1690 args->retrans = 2; 1691 args->acregmin = 3; 1692 args->acregmax = 60; 1693 args->acdirmin = 30; 1694 args->acdirmax = 60; 1695 args->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1696 1697 switch (data->version) { 1698 case 1: 1699 ap = (struct sockaddr_in *)&args->nfs_server.address; 1700 if (data->host_addrlen > sizeof(args->nfs_server.address)) 1701 goto out_no_address; 1702 if (data->host_addrlen == 0) 1703 goto out_no_address; 1704 args->nfs_server.addrlen = data->host_addrlen; 1705 if (copy_from_user(ap, data->host_addr, data->host_addrlen)) 1706 return -EFAULT; 1707 if (!nfs_verify_server_address((struct sockaddr *) 1708 &args->nfs_server.address)) 1709 goto out_no_address; 1710 1711 nfs4_default_port((struct sockaddr *) 1712 &args->nfs_server.address); 1713 1714 switch (data->auth_flavourlen) { 1715 case 0: 1716 args->auth_flavors[0] = RPC_AUTH_UNIX; 1717 break; 1718 case 1: 1719 if (copy_from_user(&args->auth_flavors[0], 1720 data->auth_flavours, 1721 sizeof(args->auth_flavors[0]))) 1722 return -EFAULT; 1723 break; 1724 default: 1725 goto out_inval_auth; 1726 } 1727 1728 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 1729 if (IS_ERR(c)) 1730 return PTR_ERR(c); 1731 args->nfs_server.hostname = c; 1732 1733 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 1734 if (IS_ERR(c)) 1735 return PTR_ERR(c); 1736 args->nfs_server.export_path = c; 1737 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 1738 1739 c = strndup_user(data->client_addr.data, 16); 1740 if (IS_ERR(c)) 1741 return PTR_ERR(c); 1742 args->client_address = c; 1743 1744 /* 1745 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 1746 * can deal with. 1747 */ 1748 1749 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 1750 args->rsize = data->rsize; 1751 args->wsize = data->wsize; 1752 args->timeo = data->timeo; 1753 args->retrans = data->retrans; 1754 args->acregmin = data->acregmin; 1755 args->acregmax = data->acregmax; 1756 args->acdirmin = data->acdirmin; 1757 args->acdirmax = data->acdirmax; 1758 args->nfs_server.protocol = data->proto; 1759 1760 break; 1761 default: { 1762 unsigned int len; 1763 1764 if (nfs_parse_mount_options((char *)options, args) == 0) 1765 return -EINVAL; 1766 1767 if (!nfs_verify_server_address((struct sockaddr *) 1768 &args->nfs_server.address)) 1769 return -EINVAL; 1770 1771 nfs4_default_port((struct sockaddr *) 1772 &args->nfs_server.address); 1773 1774 switch (args->auth_flavor_len) { 1775 case 0: 1776 args->auth_flavors[0] = RPC_AUTH_UNIX; 1777 break; 1778 case 1: 1779 break; 1780 default: 1781 goto out_inval_auth; 1782 } 1783 1784 /* 1785 * Split "dev_name" into "hostname:mntpath". 1786 */ 1787 c = strchr(dev_name, ':'); 1788 if (c == NULL) 1789 return -EINVAL; 1790 /* while calculating len, pretend ':' is '\0' */ 1791 len = c - dev_name; 1792 if (len > NFS4_MAXNAMLEN) 1793 return -ENAMETOOLONG; 1794 /* N.B. caller will free nfs_server.hostname in all cases */ 1795 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); 1796 1797 c++; /* step over the ':' */ 1798 len = strlen(c); 1799 if (len > NFS4_MAXPATHLEN) 1800 return -ENAMETOOLONG; 1801 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL); 1802 1803 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path); 1804 1805 if (args->client_address == NULL) 1806 goto out_no_client_address; 1807 1808 break; 1809 } 1810 } 1811 1812 return 0; 1813 1814 out_no_data: 1815 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 1816 return -EINVAL; 1817 1818 out_inval_auth: 1819 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 1820 data->auth_flavourlen); 1821 return -EINVAL; 1822 1823 out_no_address: 1824 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 1825 return -EINVAL; 1826 1827 out_no_client_address: 1828 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n"); 1829 return -EINVAL; 1830 } 1831 1832 /* 1833 * Get the superblock for an NFS4 mountpoint 1834 */ 1835 static int nfs4_get_sb(struct file_system_type *fs_type, 1836 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) 1837 { 1838 struct nfs_parsed_mount_data data; 1839 struct super_block *s; 1840 struct nfs_server *server; 1841 struct nfs_fh mntfh; 1842 struct dentry *mntroot; 1843 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 1844 struct nfs_sb_mountdata sb_mntdata = { 1845 .mntflags = flags, 1846 }; 1847 int error; 1848 1849 /* Validate the mount data */ 1850 error = nfs4_validate_mount_data(raw_data, &data, dev_name); 1851 if (error < 0) 1852 goto out; 1853 1854 /* Get a volume representation */ 1855 server = nfs4_create_server(&data, &mntfh); 1856 if (IS_ERR(server)) { 1857 error = PTR_ERR(server); 1858 goto out; 1859 } 1860 sb_mntdata.server = server; 1861 1862 if (server->flags & NFS4_MOUNT_UNSHARED) 1863 compare_super = NULL; 1864 1865 /* Get a superblock - note that we may end up sharing one that already exists */ 1866 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); 1867 if (IS_ERR(s)) { 1868 error = PTR_ERR(s); 1869 goto out_free; 1870 } 1871 1872 if (s->s_fs_info != server) { 1873 nfs_free_server(server); 1874 server = NULL; 1875 } 1876 1877 if (!s->s_root) { 1878 /* initial superblock/root creation */ 1879 nfs4_fill_super(s); 1880 } 1881 1882 mntroot = nfs4_get_root(s, &mntfh); 1883 if (IS_ERR(mntroot)) { 1884 error = PTR_ERR(mntroot); 1885 goto error_splat_super; 1886 } 1887 1888 s->s_flags |= MS_ACTIVE; 1889 mnt->mnt_sb = s; 1890 mnt->mnt_root = mntroot; 1891 error = 0; 1892 1893 out: 1894 kfree(data.client_address); 1895 kfree(data.nfs_server.export_path); 1896 kfree(data.nfs_server.hostname); 1897 return error; 1898 1899 out_free: 1900 nfs_free_server(server); 1901 goto out; 1902 1903 error_splat_super: 1904 up_write(&s->s_umount); 1905 deactivate_super(s); 1906 goto out; 1907 } 1908 1909 static void nfs4_kill_super(struct super_block *sb) 1910 { 1911 struct nfs_server *server = NFS_SB(sb); 1912 1913 nfs_return_all_delegations(sb); 1914 kill_anon_super(sb); 1915 1916 nfs4_renewd_prepare_shutdown(server); 1917 nfs_free_server(server); 1918 } 1919 1920 /* 1921 * Clone an NFS4 server record on xdev traversal (FSID-change) 1922 */ 1923 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, 1924 const char *dev_name, void *raw_data, 1925 struct vfsmount *mnt) 1926 { 1927 struct nfs_clone_mount *data = raw_data; 1928 struct super_block *s; 1929 struct nfs_server *server; 1930 struct dentry *mntroot; 1931 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 1932 struct nfs_sb_mountdata sb_mntdata = { 1933 .mntflags = flags, 1934 }; 1935 int error; 1936 1937 dprintk("--> nfs4_xdev_get_sb()\n"); 1938 1939 /* create a new volume representation */ 1940 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); 1941 if (IS_ERR(server)) { 1942 error = PTR_ERR(server); 1943 goto out_err_noserver; 1944 } 1945 sb_mntdata.server = server; 1946 1947 if (server->flags & NFS4_MOUNT_UNSHARED) 1948 compare_super = NULL; 1949 1950 /* Get a superblock - note that we may end up sharing one that already exists */ 1951 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 1952 if (IS_ERR(s)) { 1953 error = PTR_ERR(s); 1954 goto out_err_nosb; 1955 } 1956 1957 if (s->s_fs_info != server) { 1958 nfs_free_server(server); 1959 server = NULL; 1960 } 1961 1962 if (!s->s_root) { 1963 /* initial superblock/root creation */ 1964 nfs4_clone_super(s, data->sb); 1965 } 1966 1967 mntroot = nfs4_get_root(s, data->fh); 1968 if (IS_ERR(mntroot)) { 1969 error = PTR_ERR(mntroot); 1970 goto error_splat_super; 1971 } 1972 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 1973 dput(mntroot); 1974 error = -ESTALE; 1975 goto error_splat_super; 1976 } 1977 1978 s->s_flags |= MS_ACTIVE; 1979 mnt->mnt_sb = s; 1980 mnt->mnt_root = mntroot; 1981 1982 dprintk("<-- nfs4_xdev_get_sb() = 0\n"); 1983 return 0; 1984 1985 out_err_nosb: 1986 nfs_free_server(server); 1987 out_err_noserver: 1988 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); 1989 return error; 1990 1991 error_splat_super: 1992 up_write(&s->s_umount); 1993 deactivate_super(s); 1994 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); 1995 return error; 1996 } 1997 1998 /* 1999 * Create an NFS4 server record on referral traversal 2000 */ 2001 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, 2002 const char *dev_name, void *raw_data, 2003 struct vfsmount *mnt) 2004 { 2005 struct nfs_clone_mount *data = raw_data; 2006 struct super_block *s; 2007 struct nfs_server *server; 2008 struct dentry *mntroot; 2009 struct nfs_fh mntfh; 2010 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2011 struct nfs_sb_mountdata sb_mntdata = { 2012 .mntflags = flags, 2013 }; 2014 int error; 2015 2016 dprintk("--> nfs4_referral_get_sb()\n"); 2017 2018 /* create a new volume representation */ 2019 server = nfs4_create_referral_server(data, &mntfh); 2020 if (IS_ERR(server)) { 2021 error = PTR_ERR(server); 2022 goto out_err_noserver; 2023 } 2024 sb_mntdata.server = server; 2025 2026 if (server->flags & NFS4_MOUNT_UNSHARED) 2027 compare_super = NULL; 2028 2029 /* Get a superblock - note that we may end up sharing one that already exists */ 2030 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); 2031 if (IS_ERR(s)) { 2032 error = PTR_ERR(s); 2033 goto out_err_nosb; 2034 } 2035 2036 if (s->s_fs_info != server) { 2037 nfs_free_server(server); 2038 server = NULL; 2039 } 2040 2041 if (!s->s_root) { 2042 /* initial superblock/root creation */ 2043 nfs4_fill_super(s); 2044 } 2045 2046 mntroot = nfs4_get_root(s, &mntfh); 2047 if (IS_ERR(mntroot)) { 2048 error = PTR_ERR(mntroot); 2049 goto error_splat_super; 2050 } 2051 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { 2052 dput(mntroot); 2053 error = -ESTALE; 2054 goto error_splat_super; 2055 } 2056 2057 s->s_flags |= MS_ACTIVE; 2058 mnt->mnt_sb = s; 2059 mnt->mnt_root = mntroot; 2060 2061 dprintk("<-- nfs4_referral_get_sb() = 0\n"); 2062 return 0; 2063 2064 out_err_nosb: 2065 nfs_free_server(server); 2066 out_err_noserver: 2067 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); 2068 return error; 2069 2070 error_splat_super: 2071 up_write(&s->s_umount); 2072 deactivate_super(s); 2073 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); 2074 return error; 2075 } 2076 2077 #endif /* CONFIG_NFS_V4 */ 2078