libzfs_mount.c revision 209962
11556Srgrimes/* 21556Srgrimes * CDDL HEADER START 31556Srgrimes * 41556Srgrimes * The contents of this file are subject to the terms of the 51556Srgrimes * Common Development and Distribution License (the "License"). 61556Srgrimes * You may not use this file except in compliance with the License. 71556Srgrimes * 81556Srgrimes * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 91556Srgrimes * or http://www.opensolaris.org/os/licensing. 101556Srgrimes * See the License for the specific language governing permissions 111556Srgrimes * and limitations under the License. 121556Srgrimes * 131556Srgrimes * When distributing Covered Code, include this CDDL HEADER in each 141556Srgrimes * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 151556Srgrimes * If applicable, add the following below this CDDL HEADER, with the 161556Srgrimes * fields enclosed by brackets "[]" replaced with your own identifying 171556Srgrimes * information: Portions Copyright [yyyy] [name of copyright owner] 181556Srgrimes * 191556Srgrimes * CDDL HEADER END 201556Srgrimes */ 211556Srgrimes 221556Srgrimes/* 231556Srgrimes * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 241556Srgrimes * Use is subject to license terms. 251556Srgrimes */ 261556Srgrimes 271556Srgrimes/* 281556Srgrimes * Routines to manage ZFS mounts. We separate all the nasty routines that have 291556Srgrimes * to deal with the OS. The following functions are the main entry points -- 301556Srgrimes * they are used by mount and unmount and when changing a filesystem's 311556Srgrimes * mountpoint. 321556Srgrimes * 331556Srgrimes * zfs_is_mounted() 341556Srgrimes * zfs_mount() 351556Srgrimes * zfs_unmount() 361556Srgrimes * zfs_unmountall() 371556Srgrimes * 3820420Ssteve * This file also contains the functions used to manage sharing filesystems via 391556Srgrimes * NFS and iSCSI: 401556Srgrimes * 411556Srgrimes * zfs_is_shared() 421556Srgrimes * zfs_share() 431556Srgrimes * zfs_unshare() 4436049Scharnier * 4536049Scharnier * zfs_is_shared_nfs() 4636049Scharnier * zfs_is_shared_smb() 4736049Scharnier * zfs_is_shared_iscsi() 4850471Speter * zfs_share_proto() 491556Srgrimes * zfs_shareall(); 501556Srgrimes * zfs_share_iscsi() 511556Srgrimes * zfs_unshare_nfs() 521556Srgrimes * zfs_unshare_smb() 531556Srgrimes * zfs_unshareall_nfs() 541556Srgrimes * zfs_unshareall_smb() 5531664Seivind * zfs_unshareall() 561556Srgrimes * zfs_unshareall_bypath() 571556Srgrimes * zfs_unshare_iscsi() 581556Srgrimes * 591556Srgrimes * The following functions are available for pool consumers, and will 6077409Simp * mount/unmount and share/unshare all datasets within pool: 611556Srgrimes * 621556Srgrimes * zpool_enable_datasets() 631556Srgrimes * zpool_disable_datasets() 6450544Smharo */ 651556Srgrimes 661556Srgrimes#include <dirent.h> 671556Srgrimes#include <dlfcn.h> 681556Srgrimes#include <errno.h> 6950544Smharo#include <libgen.h> 701556Srgrimes#include <libintl.h> 7190110Simp#include <stdio.h> 7290110Simp#include <stdlib.h> 7390110Simp#include <strings.h> 7490110Simp#include <unistd.h> 751556Srgrimes#include <zone.h> 761556Srgrimes#include <sys/mntent.h> 7790110Simp#include <sys/mount.h> 781556Srgrimes#include <sys/stat.h> 791556Srgrimes 801556Srgrimes#include <libzfs.h> 811556Srgrimes 821556Srgrimes#include "libzfs_impl.h" 8377409Simp 841556Srgrimes#include <libshare.h> 8550544Smharo 861556Srgrimes#define MAXISALEN 257 /* based on sysinfo(2) man page */ 871556Srgrimes 8814154Swoschstatic int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *); 8914166Swoschzfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **, 901556Srgrimes zfs_share_proto_t); 911556Srgrimes 921556Srgrimesstatic int (*iscsitgt_zfs_share)(const char *); 9314166Swoschstatic int (*iscsitgt_zfs_unshare)(const char *); 941556Srgrimesstatic int (*iscsitgt_zfs_is_shared)(const char *); 9550544Smharostatic int (*iscsitgt_svc_online)(); 9650544Smharo 9750544Smharo/* 981556Srgrimes * The share protocols table must be in the same order as the zfs_share_prot_t 991556Srgrimes * enum in libzfs_impl.h 1001556Srgrimes */ 10114305Swoschtypedef struct { 1021556Srgrimes zfs_prop_t p_prop; 1031556Srgrimes char *p_name; 1041556Srgrimes int p_share_err; 1051556Srgrimes int p_unshare_err; 1061556Srgrimes} proto_table_t; 1071556Srgrimes 1081556Srgrimesproto_table_t proto_table[PROTO_END] = { 1091556Srgrimes {ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED}, 1101556Srgrimes {ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED}, 1111556Srgrimes}; 1121556Srgrimes 1131556Srgrimeszfs_share_proto_t nfs_only[] = { 1141556Srgrimes PROTO_NFS, 1151556Srgrimes PROTO_END 1161556Srgrimes}; 1171556Srgrimes 11836785Simpzfs_share_proto_t smb_only[] = { 11936785Simp PROTO_SMB, 1201556Srgrimes PROTO_END 1211556Srgrimes}; 1221556Srgrimeszfs_share_proto_t share_all_proto[] = { 12336383Ssteve PROTO_NFS, 12436383Ssteve PROTO_SMB, 12536383Ssteve PROTO_END 12636383Ssteve}; 1271556Srgrimes 12811298Sbde#pragma init(zfs_iscsi_init) 12911298Sbdestatic void 13011298Sbdezfs_iscsi_init(void) 13111298Sbde{ 13211298Sbde void *libiscsitgt; 13311298Sbde 13411298Sbde if ((libiscsitgt = dlopen("/lib/libiscsitgt.so.1", 13511298Sbde RTLD_LAZY | RTLD_GLOBAL)) == NULL || 13611298Sbde (iscsitgt_zfs_share = (int (*)(const char *))dlsym(libiscsitgt, 13711298Sbde "iscsitgt_zfs_share")) == NULL || 13877409Simp (iscsitgt_zfs_unshare = (int (*)(const char *))dlsym(libiscsitgt, 1391556Srgrimes "iscsitgt_zfs_unshare")) == NULL || 1401556Srgrimes (iscsitgt_zfs_is_shared = (int (*)(const char *))dlsym(libiscsitgt, 1411556Srgrimes "iscsitgt_zfs_is_shared")) == NULL || 14276878Skris (iscsitgt_svc_online = (int (*)(const char *))dlsym(libiscsitgt, 1431556Srgrimes "iscsitgt_svc_online")) == NULL) { 1441556Srgrimes iscsitgt_zfs_share = NULL; 1451556Srgrimes iscsitgt_zfs_unshare = NULL; 1461556Srgrimes iscsitgt_zfs_is_shared = NULL; 1471556Srgrimes iscsitgt_svc_online = NULL; 1481556Srgrimes } 1491556Srgrimes} 1501556Srgrimes 15190110Simp/* 1521556Srgrimes * Search the sharetab for the given mountpoint and protocol, returning 1531556Srgrimes * a zfs_share_type_t value. 15429933Swosch */ 1551556Srgrimesstatic zfs_share_type_t 1561556Srgrimesis_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto) 1571556Srgrimes{ 1581556Srgrimes char buf[MAXPATHLEN], *tab; 1591556Srgrimes char *ptr; 1601556Srgrimes 1611556Srgrimes if (hdl->libzfs_sharetab == NULL) 1621556Srgrimes return (SHARED_NOT_SHARED); 16314166Swosch 16414166Swosch (void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET); 16514166Swosch 16614305Swosch while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) { 16714305Swosch 16814166Swosch /* the mountpoint is the first entry on each line */ 16930106Swosch if ((tab = strchr(buf, '\t')) == NULL) 17030106Swosch continue; 1711556Srgrimes 1721556Srgrimes *tab = '\0'; 17330106Swosch if (strcmp(buf, mountpoint) == 0) { 1741556Srgrimes#if defined(sun) 1751556Srgrimes /* 1761556Srgrimes * the protocol field is the third field 17730106Swosch * skip over second field 1781556Srgrimes */ 17976878Skris ptr = ++tab; 18076878Skris if ((tab = strchr(ptr, '\t')) == NULL) 1811556Srgrimes continue; 1821556Srgrimes ptr = ++tab; 1831556Srgrimes if ((tab = strchr(ptr, '\t')) == NULL) 18429933Swosch continue; 18529933Swosch *tab = '\0'; 18629933Swosch if (strcmp(ptr, 18730106Swosch proto_table[proto].p_name) == 0) { 18830106Swosch switch (proto) { 1891556Srgrimes case PROTO_NFS: 19030106Swosch return (SHARED_NFS); 1911556Srgrimes case PROTO_SMB: 1921556Srgrimes return (SHARED_SMB); 19350544Smharo default: 19450544Smharo return (0); 19550544Smharo } 1961556Srgrimes } 19750544Smharo#else 1981556Srgrimes if (proto == PROTO_NFS) 19931664Seivind return (SHARED_NFS); 20031664Seivind#endif 20177409Simp } 20231664Seivind } 20331664Seivind 20431664Seivind return (SHARED_NOT_SHARED); 20531664Seivind} 20631664Seivind 20731664Seivind#if 0 20831664Seivind/* 20931664Seivind * Returns true if the specified directory is empty. If we can't open the 21031664Seivind * directory at all, return true so that the mount can fail with a more 21131664Seivind * informative error message. 21231664Seivind */ 2131556Srgrimesstatic boolean_t 2141556Srgrimesdir_is_empty(const char *dirname) 2151556Srgrimes{ 2161556Srgrimes DIR *dirp; 2171556Srgrimes struct dirent64 *dp; 2181556Srgrimes 2191556Srgrimes if ((dirp = opendir(dirname)) == NULL) 2201556Srgrimes return (B_TRUE); 2211556Srgrimes 22262963Sdwmalone while ((dp = readdir64(dirp)) != NULL) { 2231556Srgrimes 2241556Srgrimes if (strcmp(dp->d_name, ".") == 0 || 2251556Srgrimes strcmp(dp->d_name, "..") == 0) 2261556Srgrimes continue; 2271556Srgrimes 2281556Srgrimes (void) closedir(dirp); 2291556Srgrimes return (B_FALSE); 2301556Srgrimes } 23190110Simp 2321556Srgrimes (void) closedir(dirp); 2331556Srgrimes return (B_TRUE); 2341556Srgrimes} 2351556Srgrimes#endif 23623525Sguido 2371556Srgrimes/* 2381556Srgrimes * Checks to see if the mount is active. If the filesystem is mounted, we fill 2391556Srgrimes * in 'where' with the current mountpoint, and return 1. Otherwise, we return 2401556Srgrimes * 0. 2411556Srgrimes */ 2421556Srgrimesboolean_t 24323525Sguidois_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where) 24423525Sguido{ 24523525Sguido struct mnttab entry; 24676878Skris 24723525Sguido if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0) 24823525Sguido return (B_FALSE); 24923525Sguido 25023525Sguido if (where != NULL) 25123525Sguido *where = zfs_strdup(zfs_hdl, entry.mnt_mountp); 25223525Sguido 25323525Sguido return (B_TRUE); 25423525Sguido} 25523525Sguido 25623525Sguidoboolean_t 2571556Srgrimeszfs_is_mounted(zfs_handle_t *zhp, char **where) 2581556Srgrimes{ 2591556Srgrimes return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where)); 2601556Srgrimes} 26176878Skris 26276878Skris/* 2631556Srgrimes * Returns true if the given dataset is mountable, false otherwise. Returns the 2641556Srgrimes * mountpoint in 'buf'. 2651556Srgrimes */ 2661556Srgrimesstatic boolean_t 2671556Srgrimeszfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen, 2681556Srgrimes zprop_source_t *source) 2691556Srgrimes{ 2701556Srgrimes char sourceloc[ZFS_MAXNAMELEN]; 2711556Srgrimes zprop_source_t sourcetype; 2721556Srgrimes 2731556Srgrimes if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type)) 2741556Srgrimes return (B_FALSE); 2751556Srgrimes 27623525Sguido verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen, 27723525Sguido &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0); 27837245Sbde 27937245Sbde if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 || 28023525Sguido strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0) 28123525Sguido return (B_FALSE); 28223525Sguido 28323525Sguido if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF) 28423525Sguido return (B_FALSE); 28523525Sguido 28623525Sguido if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) && 2871556Srgrimes getzoneid() == GLOBAL_ZONEID) 28823525Sguido return (B_FALSE); 28963680Ssada 29063680Ssada if (source) 29163680Ssada *source = sourcetype; 29263680Ssada 29363680Ssada return (B_TRUE); 29463680Ssada} 29563680Ssada 29663680Ssada/* 29776878Skris * Mount the given filesystem. 29863680Ssada */ 29963680Ssadaint 3001556Srgrimeszfs_mount(zfs_handle_t *zhp, const char *options, int flags) 3011556Srgrimes{ 3021556Srgrimes struct stat buf; 3031556Srgrimes char mountpoint[ZFS_MAXPROPLEN]; 3041556Srgrimes char mntopts[MNT_LINE_MAX]; 3051556Srgrimes libzfs_handle_t *hdl = zhp->zfs_hdl; 3061556Srgrimes 3071556Srgrimes if (options == NULL) 3081556Srgrimes mntopts[0] = '\0'; 3091556Srgrimes else 3101556Srgrimes (void) strlcpy(mntopts, options, sizeof (mntopts)); 3111556Srgrimes 3121556Srgrimes if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL)) 3131556Srgrimes return (0); 3141556Srgrimes 3151556Srgrimes /* Create the directory if it doesn't already exist */ 31650544Smharo if (lstat(mountpoint, &buf) != 0) { 31750544Smharo if (mkdirp(mountpoint, 0755) != 0) { 3181556Srgrimes zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3191556Srgrimes "failed to create mountpoint")); 3201556Srgrimes return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, 3211556Srgrimes dgettext(TEXT_DOMAIN, "cannot mount '%s'"), 32290110Simp mountpoint)); 3231556Srgrimes } 3241556Srgrimes } 3251556Srgrimes 32640301Sdes#if 0 /* FreeBSD: overlay mounts are not checked. */ 32779452Sbrian /* 32879452Sbrian * Determine if the mountpoint is empty. If so, refuse to perform the 3291556Srgrimes * mount. We don't perform this check if MS_OVERLAY is specified, which 3301556Srgrimes * would defeat the point. We also avoid this check if 'remount' is 3311556Srgrimes * specified. 3321556Srgrimes */ 3331556Srgrimes if ((flags & MS_OVERLAY) == 0 && 3341556Srgrimes strstr(mntopts, MNTOPT_REMOUNT) == NULL && 3351556Srgrimes !dir_is_empty(mountpoint)) { 3361556Srgrimes zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3371556Srgrimes "directory is not empty")); 3381556Srgrimes return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, 3391556Srgrimes dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint)); 3401556Srgrimes } 3411556Srgrimes#endif 3421556Srgrimes 3431556Srgrimes /* perform the mount */ 3441556Srgrimes if (zmount(zfs_get_name(zhp), mountpoint, flags, 3451556Srgrimes MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) { 34679452Sbrian /* 3471556Srgrimes * Generic errors are nasty, but there are just way too many 3481556Srgrimes * from mount(), and they're well-understood. We pick a few 3491556Srgrimes * common ones to improve upon. 3501556Srgrimes */ 3511556Srgrimes if (errno == EBUSY) { 3521556Srgrimes zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3531556Srgrimes "mountpoint or dataset is busy")); 3541556Srgrimes } else if (errno == EPERM) { 3551556Srgrimes zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3561556Srgrimes "Insufficient privileges")); 3571556Srgrimes } else { 3581556Srgrimes zfs_error_aux(hdl, strerror(errno)); 3591556Srgrimes } 3601556Srgrimes return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, 3611556Srgrimes dgettext(TEXT_DOMAIN, "cannot mount '%s'"), 3621556Srgrimes zhp->zfs_name)); 3631556Srgrimes } 3641556Srgrimes 3651556Srgrimes /* add the mounted entry into our cache */ 3661556Srgrimes libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint, 36790110Simp mntopts); 3681556Srgrimes return (0); 36950544Smharo} 37014305Swosch 37150544Smharo/* 37250544Smharo * Unmount a single filesystem. 37350544Smharo */ 3741556Srgrimesstatic int 375unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags) 376{ 377 if (unmount(mountpoint, flags) != 0) { 378 zfs_error_aux(hdl, strerror(errno)); 379 return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED, 380 dgettext(TEXT_DOMAIN, "cannot unmount '%s'"), 381 mountpoint)); 382 } 383 384 return (0); 385} 386 387/* 388 * Unmount the given filesystem. 389 */ 390int 391zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags) 392{ 393 libzfs_handle_t *hdl = zhp->zfs_hdl; 394 struct mnttab entry; 395 char *mntpt = NULL; 396 397 /* check to see if we need to unmount the filesystem */ 398 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) && 399 libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) { 400 /* 401 * mountpoint may have come from a call to 402 * getmnt/getmntany if it isn't NULL. If it is NULL, 403 * we know it comes from libzfs_mnttab_find which can 404 * then get freed later. We strdup it to play it safe. 405 */ 406 if (mountpoint == NULL) 407 mntpt = zfs_strdup(hdl, entry.mnt_mountp); 408 else 409 mntpt = zfs_strdup(hdl, mountpoint); 410 411 /* 412 * Unshare and unmount the filesystem 413 */ 414 if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0) 415 return (-1); 416 417 if (unmount_one(hdl, mntpt, flags) != 0) { 418 free(mntpt); 419 (void) zfs_shareall(zhp); 420 return (-1); 421 } 422 libzfs_mnttab_remove(hdl, zhp->zfs_name); 423 free(mntpt); 424 } 425 426 return (0); 427} 428 429/* 430 * Unmount this filesystem and any children inheriting the mountpoint property. 431 * To do this, just act like we're changing the mountpoint property, but don't 432 * remount the filesystems afterwards. 433 */ 434int 435zfs_unmountall(zfs_handle_t *zhp, int flags) 436{ 437 prop_changelist_t *clp; 438 int ret; 439 440 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 0, flags); 441 if (clp == NULL) 442 return (-1); 443 444 ret = changelist_prefix(clp); 445 changelist_free(clp); 446 447 return (ret); 448} 449 450boolean_t 451zfs_is_shared(zfs_handle_t *zhp) 452{ 453 zfs_share_type_t rc = 0; 454 zfs_share_proto_t *curr_proto; 455 456 if (ZFS_IS_VOLUME(zhp)) 457 return (zfs_is_shared_iscsi(zhp)); 458 459 for (curr_proto = share_all_proto; *curr_proto != PROTO_END; 460 curr_proto++) 461 rc |= zfs_is_shared_proto(zhp, NULL, *curr_proto); 462 463 return (rc ? B_TRUE : B_FALSE); 464} 465 466int 467zfs_share(zfs_handle_t *zhp) 468{ 469 if (ZFS_IS_VOLUME(zhp)) 470 return (zfs_share_iscsi(zhp)); 471 472 return (zfs_share_proto(zhp, share_all_proto)); 473} 474 475int 476zfs_unshare(zfs_handle_t *zhp) 477{ 478 if (ZFS_IS_VOLUME(zhp)) 479 return (zfs_unshare_iscsi(zhp)); 480 481 return (zfs_unshareall(zhp)); 482} 483 484/* 485 * Check to see if the filesystem is currently shared. 486 */ 487zfs_share_type_t 488zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto) 489{ 490 char *mountpoint; 491 zfs_share_type_t rc; 492 493 if (!zfs_is_mounted(zhp, &mountpoint)) 494 return (SHARED_NOT_SHARED); 495 496 if (rc = is_shared(zhp->zfs_hdl, mountpoint, proto)) { 497 if (where != NULL) 498 *where = mountpoint; 499 else 500 free(mountpoint); 501 return (rc); 502 } else { 503 free(mountpoint); 504 return (SHARED_NOT_SHARED); 505 } 506} 507 508boolean_t 509zfs_is_shared_nfs(zfs_handle_t *zhp, char **where) 510{ 511 return (zfs_is_shared_proto(zhp, where, 512 PROTO_NFS) != SHARED_NOT_SHARED); 513} 514 515boolean_t 516zfs_is_shared_smb(zfs_handle_t *zhp, char **where) 517{ 518 return (zfs_is_shared_proto(zhp, where, 519 PROTO_SMB) != SHARED_NOT_SHARED); 520} 521 522/* 523 * Make sure things will work if libshare isn't installed by using 524 * wrapper functions that check to see that the pointers to functions 525 * initialized in _zfs_init_libshare() are actually present. 526 */ 527 528#if 0 529static sa_handle_t (*_sa_init)(int); 530static void (*_sa_fini)(sa_handle_t); 531static sa_share_t (*_sa_find_share)(sa_handle_t, char *); 532static int (*_sa_enable_share)(sa_share_t, char *); 533static int (*_sa_disable_share)(sa_share_t, char *); 534static char *(*_sa_errorstr)(int); 535static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *); 536static boolean_t (*_sa_needs_refresh)(sa_handle_t *); 537static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t); 538static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t, 539 char *, char *, zprop_source_t, char *, char *, char *); 540static void (*_sa_update_sharetab_ts)(sa_handle_t); 541#endif 542 543/* 544 * _zfs_init_libshare() 545 * 546 * Find the libshare.so.1 entry points that we use here and save the 547 * values to be used later. This is triggered by the runtime loader. 548 * Make sure the correct ISA version is loaded. 549 */ 550 551#pragma init(_zfs_init_libshare) 552static void 553_zfs_init_libshare(void) 554{ 555#if 0 556 void *libshare; 557 char path[MAXPATHLEN]; 558 char isa[MAXISALEN]; 559 560#if defined(_LP64) 561 if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1) 562 isa[0] = '\0'; 563#else 564 isa[0] = '\0'; 565#endif 566 (void) snprintf(path, MAXPATHLEN, 567 "/usr/lib/%s/libshare.so.1", isa); 568 569 if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) { 570 _sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init"); 571 _sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini"); 572 _sa_find_share = (sa_share_t (*)(sa_handle_t, char *)) 573 dlsym(libshare, "sa_find_share"); 574 _sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare, 575 "sa_enable_share"); 576 _sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare, 577 "sa_disable_share"); 578 _sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr"); 579 _sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *)) 580 dlsym(libshare, "sa_parse_legacy_options"); 581 _sa_needs_refresh = (boolean_t (*)(sa_handle_t *)) 582 dlsym(libshare, "sa_needs_refresh"); 583 _sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t)) 584 dlsym(libshare, "sa_get_zfs_handle"); 585 _sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t, 586 sa_share_t, char *, char *, zprop_source_t, char *, 587 char *, char *))dlsym(libshare, "sa_zfs_process_share"); 588 _sa_update_sharetab_ts = (void (*)(sa_handle_t)) 589 dlsym(libshare, "sa_update_sharetab_ts"); 590 if (_sa_init == NULL || _sa_fini == NULL || 591 _sa_find_share == NULL || _sa_enable_share == NULL || 592 _sa_disable_share == NULL || _sa_errorstr == NULL || 593 _sa_parse_legacy_options == NULL || 594 _sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL || 595 _sa_zfs_process_share == NULL || 596 _sa_update_sharetab_ts == NULL) { 597 _sa_init = NULL; 598 _sa_fini = NULL; 599 _sa_disable_share = NULL; 600 _sa_enable_share = NULL; 601 _sa_errorstr = NULL; 602 _sa_parse_legacy_options = NULL; 603 (void) dlclose(libshare); 604 _sa_needs_refresh = NULL; 605 _sa_get_zfs_handle = NULL; 606 _sa_zfs_process_share = NULL; 607 _sa_update_sharetab_ts = NULL; 608 } 609 } 610#endif 611} 612 613/* 614 * zfs_init_libshare(zhandle, service) 615 * 616 * Initialize the libshare API if it hasn't already been initialized. 617 * In all cases it returns 0 if it succeeded and an error if not. The 618 * service value is which part(s) of the API to initialize and is a 619 * direct map to the libshare sa_init(service) interface. 620 */ 621int 622zfs_init_libshare(libzfs_handle_t *zhandle, int service) 623{ 624 int ret = SA_OK; 625 626#if 0 627 if (_sa_init == NULL) 628 ret = SA_CONFIG_ERR; 629 630 if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) { 631 /* 632 * We had a cache miss. Most likely it is a new ZFS 633 * dataset that was just created. We want to make sure 634 * so check timestamps to see if a different process 635 * has updated any of the configuration. If there was 636 * some non-ZFS change, we need to re-initialize the 637 * internal cache. 638 */ 639 zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS; 640 if (_sa_needs_refresh != NULL && 641 _sa_needs_refresh(zhandle->libzfs_sharehdl)) { 642 zfs_uninit_libshare(zhandle); 643 zhandle->libzfs_sharehdl = _sa_init(service); 644 } 645 } 646 647 if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL) 648 zhandle->libzfs_sharehdl = _sa_init(service); 649 650 if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL) 651 ret = SA_NO_MEMORY; 652#endif 653 654 return (ret); 655} 656 657/* 658 * zfs_uninit_libshare(zhandle) 659 * 660 * Uninitialize the libshare API if it hasn't already been 661 * uninitialized. It is OK to call multiple times. 662 */ 663void 664zfs_uninit_libshare(libzfs_handle_t *zhandle) 665{ 666 if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) { 667#if 0 668 if (_sa_fini != NULL) 669 _sa_fini(zhandle->libzfs_sharehdl); 670#endif 671 zhandle->libzfs_sharehdl = NULL; 672 } 673} 674 675/* 676 * zfs_parse_options(options, proto) 677 * 678 * Call the legacy parse interface to get the protocol specific 679 * options using the NULL arg to indicate that this is a "parse" only. 680 */ 681int 682zfs_parse_options(char *options, zfs_share_proto_t proto) 683{ 684#if 0 685 if (_sa_parse_legacy_options != NULL) { 686 return (_sa_parse_legacy_options(NULL, options, 687 proto_table[proto].p_name)); 688 } 689 return (SA_CONFIG_ERR); 690#else 691 return (SA_OK); 692#endif 693} 694 695#if 0 696/* 697 * zfs_sa_find_share(handle, path) 698 * 699 * wrapper around sa_find_share to find a share path in the 700 * configuration. 701 */ 702static sa_share_t 703zfs_sa_find_share(sa_handle_t handle, char *path) 704{ 705 if (_sa_find_share != NULL) 706 return (_sa_find_share(handle, path)); 707 return (NULL); 708} 709 710/* 711 * zfs_sa_enable_share(share, proto) 712 * 713 * Wrapper for sa_enable_share which enables a share for a specified 714 * protocol. 715 */ 716static int 717zfs_sa_enable_share(sa_share_t share, char *proto) 718{ 719 if (_sa_enable_share != NULL) 720 return (_sa_enable_share(share, proto)); 721 return (SA_CONFIG_ERR); 722} 723 724/* 725 * zfs_sa_disable_share(share, proto) 726 * 727 * Wrapper for sa_enable_share which disables a share for a specified 728 * protocol. 729 */ 730static int 731zfs_sa_disable_share(sa_share_t share, char *proto) 732{ 733 if (_sa_disable_share != NULL) 734 return (_sa_disable_share(share, proto)); 735 return (SA_CONFIG_ERR); 736} 737#endif 738 739/* 740 * Share the given filesystem according to the options in the specified 741 * protocol specific properties (sharenfs, sharesmb). We rely 742 * on "libshare" to the dirty work for us. 743 */ 744static int 745zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto) 746{ 747 char mountpoint[ZFS_MAXPROPLEN]; 748 char shareopts[ZFS_MAXPROPLEN]; 749 char sourcestr[ZFS_MAXPROPLEN]; 750 libzfs_handle_t *hdl = zhp->zfs_hdl; 751 zfs_share_proto_t *curr_proto; 752 zprop_source_t sourcetype; 753 int error, ret; 754 755 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL)) 756 return (0); 757 758 for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) { 759 /* 760 * Return success if there are no share options. 761 */ 762 if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop, 763 shareopts, sizeof (shareopts), &sourcetype, sourcestr, 764 ZFS_MAXPROPLEN, B_FALSE) != 0 || 765 strcmp(shareopts, "off") == 0) 766 continue; 767 768 /* 769 * If the 'zoned' property is set, then zfs_is_mountable() 770 * will have already bailed out if we are in the global zone. 771 * But local zones cannot be NFS servers, so we ignore it for 772 * local zones as well. 773 */ 774 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) 775 continue; 776 777 if (*curr_proto != PROTO_NFS) { 778 fprintf(stderr, "Unsupported share protocol: %d.\n", 779 *curr_proto); 780 continue; 781 } 782 783#if 0 784 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint); 785 if (share == NULL) { 786 /* 787 * This may be a new file system that was just 788 * created so isn't in the internal cache 789 * (second time through). Rather than 790 * reloading the entire configuration, we can 791 * assume ZFS has done the checking and it is 792 * safe to add this to the internal 793 * configuration. 794 */ 795 if (_sa_zfs_process_share(hdl->libzfs_sharehdl, 796 NULL, NULL, mountpoint, 797 proto_table[*curr_proto].p_name, sourcetype, 798 shareopts, sourcestr, zhp->zfs_name) != SA_OK) { 799 (void) zfs_error_fmt(hdl, 800 proto_table[*curr_proto].p_share_err, 801 dgettext(TEXT_DOMAIN, "cannot share '%s'"), 802 zfs_get_name(zhp)); 803 return (-1); 804 } 805 hdl->libzfs_shareflags |= ZFSSHARE_MISS; 806 share = zfs_sa_find_share(hdl->libzfs_sharehdl, 807 mountpoint); 808 } 809 if (share != NULL) { 810 int err; 811 err = zfs_sa_enable_share(share, 812 proto_table[*curr_proto].p_name); 813 if (err != SA_OK) { 814 (void) zfs_error_fmt(hdl, 815 proto_table[*curr_proto].p_share_err, 816 dgettext(TEXT_DOMAIN, "cannot share '%s'"), 817 zfs_get_name(zhp)); 818 return (-1); 819 } 820 } else 821#else 822 if (strcmp(shareopts, "on") == 0) 823 error = fsshare(ZFS_EXPORTS_PATH, mountpoint, ""); 824 else 825 error = fsshare(ZFS_EXPORTS_PATH, mountpoint, shareopts); 826 if (error != 0) 827#endif 828 { 829 (void) zfs_error_fmt(hdl, 830 proto_table[*curr_proto].p_share_err, 831 dgettext(TEXT_DOMAIN, "cannot share '%s'"), 832 zfs_get_name(zhp)); 833 return (-1); 834 } 835 } 836 return (0); 837} 838 839 840int 841zfs_share_nfs(zfs_handle_t *zhp) 842{ 843 return (zfs_share_proto(zhp, nfs_only)); 844} 845 846int 847zfs_share_smb(zfs_handle_t *zhp) 848{ 849 return (zfs_share_proto(zhp, smb_only)); 850} 851 852int 853zfs_shareall(zfs_handle_t *zhp) 854{ 855 return (zfs_share_proto(zhp, share_all_proto)); 856} 857 858/* 859 * Unshare a filesystem by mountpoint. 860 */ 861static int 862unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint, 863 zfs_share_proto_t proto) 864{ 865 char buf[MAXPATHLEN]; 866 FILE *fp; 867 int error; 868 869 if (proto != PROTO_NFS) { 870 fprintf(stderr, "No SMB support in FreeBSD yet.\n"); 871 return (EOPNOTSUPP); 872 } 873 874 error = fsunshare(ZFS_EXPORTS_PATH, mountpoint); 875 if (error != 0) { 876 zfs_error_aux(hdl, "%s", strerror(error)); 877 return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED, 878 dgettext(TEXT_DOMAIN, 879 "cannot unshare '%s'"), name)); 880 } 881 882 return (0); 883} 884 885/* 886 * Unshare the given filesystem. 887 */ 888int 889zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint, 890 zfs_share_proto_t *proto) 891{ 892 libzfs_handle_t *hdl = zhp->zfs_hdl; 893 struct mnttab entry; 894 char *mntpt = NULL; 895 896 /* check to see if need to unmount the filesystem */ 897 rewind(zhp->zfs_hdl->libzfs_mnttab); 898 if (mountpoint != NULL) 899 mountpoint = mntpt = zfs_strdup(hdl, mountpoint); 900 901 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) && 902 libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) { 903 zfs_share_proto_t *curr_proto; 904 905 if (mountpoint == NULL) 906 mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp); 907 908 for (curr_proto = proto; *curr_proto != PROTO_END; 909 curr_proto++) { 910 911 if (is_shared(hdl, mntpt, *curr_proto) && 912 unshare_one(hdl, zhp->zfs_name, 913 mntpt, *curr_proto) != 0) { 914 if (mntpt != NULL) 915 free(mntpt); 916 return (-1); 917 } 918 } 919 } 920 if (mntpt != NULL) 921 free(mntpt); 922 923 return (0); 924} 925 926int 927zfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint) 928{ 929 return (zfs_unshare_proto(zhp, mountpoint, nfs_only)); 930} 931 932int 933zfs_unshare_smb(zfs_handle_t *zhp, const char *mountpoint) 934{ 935 return (zfs_unshare_proto(zhp, mountpoint, smb_only)); 936} 937 938/* 939 * Same as zfs_unmountall(), but for NFS and SMB unshares. 940 */ 941int 942zfs_unshareall_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto) 943{ 944 prop_changelist_t *clp; 945 int ret; 946 947 clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0); 948 if (clp == NULL) 949 return (-1); 950 951 ret = changelist_unshare(clp, proto); 952 changelist_free(clp); 953 954 return (ret); 955} 956 957int 958zfs_unshareall_nfs(zfs_handle_t *zhp) 959{ 960 return (zfs_unshareall_proto(zhp, nfs_only)); 961} 962 963int 964zfs_unshareall_smb(zfs_handle_t *zhp) 965{ 966 return (zfs_unshareall_proto(zhp, smb_only)); 967} 968 969int 970zfs_unshareall(zfs_handle_t *zhp) 971{ 972 return (zfs_unshareall_proto(zhp, share_all_proto)); 973} 974 975int 976zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint) 977{ 978 return (zfs_unshare_proto(zhp, mountpoint, share_all_proto)); 979} 980 981/* 982 * Remove the mountpoint associated with the current dataset, if necessary. 983 * We only remove the underlying directory if: 984 * 985 * - The mountpoint is not 'none' or 'legacy' 986 * - The mountpoint is non-empty 987 * - The mountpoint is the default or inherited 988 * - The 'zoned' property is set, or we're in a local zone 989 * 990 * Any other directories we leave alone. 991 */ 992void 993remove_mountpoint(zfs_handle_t *zhp) 994{ 995 char mountpoint[ZFS_MAXPROPLEN]; 996 zprop_source_t source; 997 998 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), 999 &source)) 1000 return; 1001 1002 if (source == ZPROP_SRC_DEFAULT || 1003 source == ZPROP_SRC_INHERITED) { 1004 /* 1005 * Try to remove the directory, silently ignoring any errors. 1006 * The filesystem may have since been removed or moved around, 1007 * and this error isn't really useful to the administrator in 1008 * any way. 1009 */ 1010 (void) rmdir(mountpoint); 1011 } 1012} 1013 1014boolean_t 1015zfs_is_shared_iscsi(zfs_handle_t *zhp) 1016{ 1017 1018 /* 1019 * If iscsi deamon isn't running then we aren't shared 1020 */ 1021 if (iscsitgt_svc_online && iscsitgt_svc_online() == 1) 1022 return (B_FALSE); 1023 else 1024 return (iscsitgt_zfs_is_shared != NULL && 1025 iscsitgt_zfs_is_shared(zhp->zfs_name) != 0); 1026} 1027 1028int 1029zfs_share_iscsi(zfs_handle_t *zhp) 1030{ 1031 char shareopts[ZFS_MAXPROPLEN]; 1032 const char *dataset = zhp->zfs_name; 1033 libzfs_handle_t *hdl = zhp->zfs_hdl; 1034 1035 /* 1036 * Return success if there are no share options. 1037 */ 1038 if (zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts, 1039 sizeof (shareopts), NULL, NULL, 0, B_FALSE) != 0 || 1040 strcmp(shareopts, "off") == 0) 1041 return (0); 1042 1043/* We don't support iSCSI on FreeBSD yet. */ 1044#ifdef TODO 1045 if (iscsitgt_zfs_share == NULL || iscsitgt_zfs_share(dataset) != 0) { 1046 int error = EZFS_SHAREISCSIFAILED; 1047 1048 /* 1049 * If service isn't availabele and EPERM was 1050 * returned then use special error. 1051 */ 1052 if (iscsitgt_svc_online && errno == EPERM && 1053 (iscsitgt_svc_online() != 0)) 1054 error = EZFS_ISCSISVCUNAVAIL; 1055 1056 return (zfs_error_fmt(hdl, error, 1057 dgettext(TEXT_DOMAIN, "cannot share '%s'"), dataset)); 1058 } 1059#endif 1060 1061 return (0); 1062} 1063 1064int 1065zfs_unshare_iscsi(zfs_handle_t *zhp) 1066{ 1067 const char *dataset = zfs_get_name(zhp); 1068 libzfs_handle_t *hdl = zhp->zfs_hdl; 1069 1070/* We don't support iSCSI on FreeBSD yet. */ 1071#ifdef TODO 1072 /* 1073 * Return if the volume is not shared 1074 */ 1075 if (zfs_is_shared_iscsi(zhp) != SHARED_ISCSI) 1076 return (0); 1077 1078 /* 1079 * If this fails with ENODEV it indicates that zvol wasn't shared so 1080 * we should return success in that case. 1081 */ 1082 if (iscsitgt_zfs_unshare == NULL || 1083 (iscsitgt_zfs_unshare(dataset) != 0 && errno != ENODEV)) { 1084 if (errno == EPERM) 1085 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1086 "Insufficient privileges to unshare iscsi")); 1087 return (zfs_error_fmt(hdl, EZFS_UNSHAREISCSIFAILED, 1088 dgettext(TEXT_DOMAIN, "cannot unshare '%s'"), dataset)); 1089 } 1090#endif 1091 1092 return (0); 1093} 1094 1095typedef struct mount_cbdata { 1096 zfs_handle_t **cb_datasets; 1097 int cb_used; 1098 int cb_alloc; 1099} mount_cbdata_t; 1100 1101static int 1102mount_cb(zfs_handle_t *zhp, void *data) 1103{ 1104 mount_cbdata_t *cbp = data; 1105 1106 if (!(zfs_get_type(zhp) & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME))) { 1107 zfs_close(zhp); 1108 return (0); 1109 } 1110 1111 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) { 1112 zfs_close(zhp); 1113 return (0); 1114 } 1115 1116 if (cbp->cb_alloc == cbp->cb_used) { 1117 void *ptr; 1118 1119 if ((ptr = zfs_realloc(zhp->zfs_hdl, 1120 cbp->cb_datasets, cbp->cb_alloc * sizeof (void *), 1121 cbp->cb_alloc * 2 * sizeof (void *))) == NULL) 1122 return (-1); 1123 cbp->cb_datasets = ptr; 1124 1125 cbp->cb_alloc *= 2; 1126 } 1127 1128 cbp->cb_datasets[cbp->cb_used++] = zhp; 1129 1130 return (zfs_iter_filesystems(zhp, mount_cb, cbp)); 1131} 1132 1133static int 1134dataset_cmp(const void *a, const void *b) 1135{ 1136 zfs_handle_t **za = (zfs_handle_t **)a; 1137 zfs_handle_t **zb = (zfs_handle_t **)b; 1138 char mounta[MAXPATHLEN]; 1139 char mountb[MAXPATHLEN]; 1140 boolean_t gota, gotb; 1141 1142 if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0) 1143 verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta, 1144 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0); 1145 if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0) 1146 verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb, 1147 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0); 1148 1149 if (gota && gotb) 1150 return (strcmp(mounta, mountb)); 1151 1152 if (gota) 1153 return (-1); 1154 if (gotb) 1155 return (1); 1156 1157 return (strcmp(zfs_get_name(a), zfs_get_name(b))); 1158} 1159 1160/* 1161 * Mount and share all datasets within the given pool. This assumes that no 1162 * datasets within the pool are currently mounted. Because users can create 1163 * complicated nested hierarchies of mountpoints, we first gather all the 1164 * datasets and mountpoints within the pool, and sort them by mountpoint. Once 1165 * we have the list of all filesystems, we iterate over them in order and mount 1166 * and/or share each one. 1167 */ 1168#pragma weak zpool_mount_datasets = zpool_enable_datasets 1169int 1170zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags) 1171{ 1172 mount_cbdata_t cb = { 0 }; 1173 libzfs_handle_t *hdl = zhp->zpool_hdl; 1174 zfs_handle_t *zfsp; 1175 int i, ret = -1; 1176 int *good; 1177 1178 /* 1179 * Gather all non-snap datasets within the pool. 1180 */ 1181 if ((cb.cb_datasets = zfs_alloc(hdl, 4 * sizeof (void *))) == NULL) 1182 return (-1); 1183 cb.cb_alloc = 4; 1184 1185 if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_DATASET)) == NULL) 1186 goto out; 1187 1188 cb.cb_datasets[0] = zfsp; 1189 cb.cb_used = 1; 1190 1191 if (zfs_iter_filesystems(zfsp, mount_cb, &cb) != 0) 1192 goto out; 1193 1194 /* 1195 * Sort the datasets by mountpoint. 1196 */ 1197 qsort(cb.cb_datasets, cb.cb_used, sizeof (void *), dataset_cmp); 1198 1199 /* 1200 * And mount all the datasets, keeping track of which ones 1201 * succeeded or failed. 1202 */ 1203 if ((good = zfs_alloc(zhp->zpool_hdl, 1204 cb.cb_used * sizeof (int))) == NULL) 1205 goto out; 1206 1207 ret = 0; 1208 for (i = 0; i < cb.cb_used; i++) { 1209 if (zfs_mount(cb.cb_datasets[i], mntopts, flags) != 0) 1210 ret = -1; 1211 else 1212 good[i] = 1; 1213 } 1214 1215 /* 1216 * Then share all the ones that need to be shared. This needs 1217 * to be a separate pass in order to avoid excessive reloading 1218 * of the configuration. Good should never be NULL since 1219 * zfs_alloc is supposed to exit if memory isn't available. 1220 */ 1221 for (i = 0; i < cb.cb_used; i++) { 1222 if (good[i] && zfs_share(cb.cb_datasets[i]) != 0) 1223 ret = -1; 1224 } 1225 1226 free(good); 1227 1228out: 1229 for (i = 0; i < cb.cb_used; i++) 1230 zfs_close(cb.cb_datasets[i]); 1231 free(cb.cb_datasets); 1232 1233 return (ret); 1234} 1235 1236 1237static int 1238zvol_cb(const char *dataset, void *data) 1239{ 1240 libzfs_handle_t *hdl = data; 1241 zfs_handle_t *zhp; 1242 1243 /* 1244 * Ignore snapshots and ignore failures from non-existant datasets. 1245 */ 1246 if (strchr(dataset, '@') != NULL || 1247 (zhp = zfs_open(hdl, dataset, ZFS_TYPE_VOLUME)) == NULL) 1248 return (0); 1249 1250 if (zfs_unshare_iscsi(zhp) != 0) 1251 return (-1); 1252 1253 zfs_close(zhp); 1254 1255 return (0); 1256} 1257 1258static int 1259mountpoint_compare(const void *a, const void *b) 1260{ 1261 const char *mounta = *((char **)a); 1262 const char *mountb = *((char **)b); 1263 1264 return (strcmp(mountb, mounta)); 1265} 1266 1267/* 1268 * Unshare and unmount all datasets within the given pool. We don't want to 1269 * rely on traversing the DSL to discover the filesystems within the pool, 1270 * because this may be expensive (if not all of them are mounted), and can fail 1271 * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and 1272 * gather all the filesystems that are currently mounted. 1273 */ 1274#pragma weak zpool_unmount_datasets = zpool_disable_datasets 1275int 1276zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force) 1277{ 1278 int used, alloc; 1279 struct statfs *sfs; 1280 size_t namelen; 1281 char **mountpoints = NULL; 1282 zfs_handle_t **datasets = NULL; 1283 libzfs_handle_t *hdl = zhp->zpool_hdl; 1284 int i, j, n; 1285 int ret = -1; 1286 int flags = (force ? MS_FORCE : 0); 1287 1288 /* 1289 * First unshare all zvols. 1290 */ 1291 if (zpool_iter_zvol(zhp, zvol_cb, hdl) != 0) 1292 return (-1); 1293 1294 namelen = strlen(zhp->zpool_name); 1295 1296 used = alloc = 0; 1297 if ((n = getmntinfo(&sfs, MNT_WAIT)) == 0) { 1298 fprintf(stderr, "getmntinfo(): %s\n", strerror(errno)); 1299 return (-1); 1300 } 1301 for (j = 0; j < n; j++) { 1302 /* 1303 * Ignore non-ZFS entries. 1304 */ 1305 if (strcmp(sfs[j].f_fstypename, MNTTYPE_ZFS) != 0) 1306 continue; 1307 1308 /* 1309 * Ignore filesystems not within this pool. 1310 */ 1311 if (strncmp(sfs[j].f_mntfromname, zhp->zpool_name, namelen) != 0 || 1312 (sfs[j].f_mntfromname[namelen] != '/' && 1313 sfs[j].f_mntfromname[namelen] != '\0')) 1314 continue; 1315 1316 /* 1317 * At this point we've found a filesystem within our pool. Add 1318 * it to our growing list. 1319 */ 1320 if (used == alloc) { 1321 if (alloc == 0) { 1322 if ((mountpoints = zfs_alloc(hdl, 1323 8 * sizeof (void *))) == NULL) 1324 goto out; 1325 1326 if ((datasets = zfs_alloc(hdl, 1327 8 * sizeof (void *))) == NULL) 1328 goto out; 1329 1330 alloc = 8; 1331 } else { 1332 void *ptr; 1333 1334 if ((ptr = zfs_realloc(hdl, mountpoints, 1335 alloc * sizeof (void *), 1336 alloc * 2 * sizeof (void *))) == NULL) 1337 goto out; 1338 mountpoints = ptr; 1339 1340 if ((ptr = zfs_realloc(hdl, datasets, 1341 alloc * sizeof (void *), 1342 alloc * 2 * sizeof (void *))) == NULL) 1343 goto out; 1344 datasets = ptr; 1345 1346 alloc *= 2; 1347 } 1348 } 1349 1350 if ((mountpoints[used] = zfs_strdup(hdl, 1351 sfs[j].f_mntonname)) == NULL) 1352 goto out; 1353 1354 /* 1355 * This is allowed to fail, in case there is some I/O error. It 1356 * is only used to determine if we need to remove the underlying 1357 * mountpoint, so failure is not fatal. 1358 */ 1359 datasets[used] = make_dataset_handle(hdl, sfs[j].f_mntfromname); 1360 1361 used++; 1362 } 1363 1364 /* 1365 * At this point, we have the entire list of filesystems, so sort it by 1366 * mountpoint. 1367 */ 1368 qsort(mountpoints, used, sizeof (char *), mountpoint_compare); 1369 1370 /* 1371 * Walk through and first unshare everything. 1372 */ 1373 for (i = 0; i < used; i++) { 1374 zfs_share_proto_t *curr_proto; 1375 for (curr_proto = share_all_proto; *curr_proto != PROTO_END; 1376 curr_proto++) { 1377 if (is_shared(hdl, mountpoints[i], *curr_proto) && 1378 unshare_one(hdl, mountpoints[i], 1379 mountpoints[i], *curr_proto) != 0) 1380 goto out; 1381 } 1382 } 1383 1384 /* 1385 * Now unmount everything, removing the underlying directories as 1386 * appropriate. 1387 */ 1388 for (i = 0; i < used; i++) { 1389 if (unmount_one(hdl, mountpoints[i], flags) != 0) 1390 goto out; 1391 } 1392 1393 for (i = 0; i < used; i++) { 1394 if (datasets[i]) 1395 remove_mountpoint(datasets[i]); 1396 } 1397 1398 ret = 0; 1399out: 1400 for (i = 0; i < used; i++) { 1401 if (datasets[i]) 1402 zfs_close(datasets[i]); 1403 free(mountpoints[i]); 1404 } 1405 free(datasets); 1406 free(mountpoints); 1407 1408 return (ret); 1409} 1410