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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
7ea4f88f | 23 | * Copyright 2015 Nexenta Systems, Inc. All rights reserved. |
428870ff | 24 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
f5ada653 | 25 | * Copyright (c) 2014, 2021 by Delphix. All rights reserved. |
23d70cde | 26 | * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> |
7e35ea78 | 27 | * Copyright 2017 RackTop Systems. |
50a343d8 | 28 | * Copyright (c) 2018 Datto Inc. |
e63ac16d | 29 | * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. |
34dc7c2f BB |
30 | */ |
31 | ||
34dc7c2f BB |
32 | /* |
33 | * Routines to manage ZFS mounts. We separate all the nasty routines that have | |
34 | * to deal with the OS. The following functions are the main entry points -- | |
35 | * they are used by mount and unmount and when changing a filesystem's | |
36 | * mountpoint. | |
37 | * | |
a10d50f9 SR |
38 | * zfs_is_mounted() |
39 | * zfs_mount() | |
68a192e4 | 40 | * zfs_mount_at() |
a10d50f9 SR |
41 | * zfs_unmount() |
42 | * zfs_unmountall() | |
34dc7c2f | 43 | * |
b4d9a82f | 44 | * This file also contains the functions used to manage sharing filesystems: |
34dc7c2f | 45 | * |
a10d50f9 SR |
46 | * zfs_is_shared() |
47 | * zfs_share() | |
48 | * zfs_unshare() | |
34dc7c2f | 49 | * zfs_unshareall() |
b4d9a82f | 50 | * zfs_commit_shares() |
34dc7c2f BB |
51 | * |
52 | * The following functions are available for pool consumers, and will | |
53 | * mount/unmount and share/unshare all datasets within pool: | |
54 | * | |
a10d50f9 SR |
55 | * zpool_enable_datasets() |
56 | * zpool_disable_datasets() | |
34dc7c2f BB |
57 | */ |
58 | ||
59 | #include <dirent.h> | |
60 | #include <dlfcn.h> | |
61 | #include <errno.h> | |
3cbe6b29 | 62 | #include <fcntl.h> |
34dc7c2f BB |
63 | #include <libgen.h> |
64 | #include <libintl.h> | |
65 | #include <stdio.h> | |
66 | #include <stdlib.h> | |
d465fc58 | 67 | #include <string.h> |
34dc7c2f BB |
68 | #include <unistd.h> |
69 | #include <zone.h> | |
70 | #include <sys/mntent.h> | |
34dc7c2f BB |
71 | #include <sys/mount.h> |
72 | #include <sys/stat.h> | |
774ee3c7 | 73 | #include <sys/vfs.h> |
b5256303 | 74 | #include <sys/dsl_crypt.h> |
34dc7c2f BB |
75 | |
76 | #include <libzfs.h> | |
77 | ||
78 | #include "libzfs_impl.h" | |
a10d50f9 | 79 | #include <thread_pool.h> |
34dc7c2f BB |
80 | |
81 | #include <libshare.h> | |
82 | #include <sys/systeminfo.h> | |
83 | #define MAXISALEN 257 /* based on sysinfo(2) man page */ | |
84 | ||
a10d50f9 SR |
85 | static int mount_tp_nthr = 512; /* tpool threads for multi-threaded mounting */ |
86 | ||
87 | static void zfs_mount_task(void *); | |
34dc7c2f | 88 | |
471e9a10 AZ |
89 | static const proto_table_t proto_table[SA_PROTOCOL_COUNT] = { |
90 | [SA_PROTOCOL_NFS] = | |
91 | {ZFS_PROP_SHARENFS, EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED}, | |
92 | [SA_PROTOCOL_SMB] = | |
93 | {ZFS_PROP_SHARESMB, EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED}, | |
34dc7c2f BB |
94 | }; |
95 | ||
471e9a10 AZ |
96 | static const enum sa_protocol share_all_proto[SA_PROTOCOL_COUNT + 1] = { |
97 | SA_PROTOCOL_NFS, | |
98 | SA_PROTOCOL_SMB, | |
99 | SA_NO_PROTOCOL | |
34dc7c2f BB |
100 | }; |
101 | ||
34dc7c2f | 102 | |
34dc7c2f | 103 | |
34dc7c2f | 104 | static boolean_t |
774ee3c7 GM |
105 | dir_is_empty_stat(const char *dirname) |
106 | { | |
107 | struct stat st; | |
108 | ||
109 | /* | |
110 | * We only want to return false if the given path is a non empty | |
111 | * directory, all other errors are handled elsewhere. | |
112 | */ | |
113 | if (stat(dirname, &st) < 0 || !S_ISDIR(st.st_mode)) { | |
114 | return (B_TRUE); | |
115 | } | |
116 | ||
117 | /* | |
118 | * An empty directory will still have two entries in it, one | |
119 | * entry for each of "." and "..". | |
120 | */ | |
121 | if (st.st_size > 2) { | |
122 | return (B_FALSE); | |
123 | } | |
124 | ||
125 | return (B_TRUE); | |
126 | } | |
127 | ||
128 | static boolean_t | |
129 | dir_is_empty_readdir(const char *dirname) | |
34dc7c2f BB |
130 | { |
131 | DIR *dirp; | |
132 | struct dirent64 *dp; | |
3cbe6b29 | 133 | int dirfd; |
34dc7c2f | 134 | |
3cbe6b29 GM |
135 | if ((dirfd = openat(AT_FDCWD, dirname, |
136 | O_RDONLY | O_NDELAY | O_LARGEFILE | O_CLOEXEC, 0)) < 0) { | |
34dc7c2f | 137 | return (B_TRUE); |
3cbe6b29 GM |
138 | } |
139 | ||
140 | if ((dirp = fdopendir(dirfd)) == NULL) { | |
aa6e82a6 | 141 | (void) close(dirfd); |
3cbe6b29 GM |
142 | return (B_TRUE); |
143 | } | |
34dc7c2f BB |
144 | |
145 | while ((dp = readdir64(dirp)) != NULL) { | |
146 | ||
147 | if (strcmp(dp->d_name, ".") == 0 || | |
148 | strcmp(dp->d_name, "..") == 0) | |
149 | continue; | |
150 | ||
151 | (void) closedir(dirp); | |
152 | return (B_FALSE); | |
153 | } | |
154 | ||
155 | (void) closedir(dirp); | |
156 | return (B_TRUE); | |
157 | } | |
158 | ||
774ee3c7 GM |
159 | /* |
160 | * Returns true if the specified directory is empty. If we can't open the | |
161 | * directory at all, return true so that the mount can fail with a more | |
162 | * informative error message. | |
163 | */ | |
164 | static boolean_t | |
165 | dir_is_empty(const char *dirname) | |
166 | { | |
167 | struct statfs64 st; | |
168 | ||
169 | /* | |
170 | * If the statvfs call fails or the filesystem is not a ZFS | |
171 | * filesystem, fall back to the slow path which uses readdir. | |
172 | */ | |
173 | if ((statfs64(dirname, &st) != 0) || | |
174 | (st.f_type != ZFS_SUPER_MAGIC)) { | |
175 | return (dir_is_empty_readdir(dirname)); | |
176 | } | |
177 | ||
178 | /* | |
179 | * At this point, we know the provided path is on a ZFS | |
180 | * filesystem, so we can use stat instead of readdir to | |
181 | * determine if the directory is empty or not. We try to avoid | |
182 | * using readdir because that requires opening "dirname"; this | |
183 | * open file descriptor can potentially end up in a child | |
184 | * process if there's a concurrent fork, thus preventing the | |
185 | * zfs_mount() from otherwise succeeding (the open file | |
186 | * descriptor inherited by the child process will cause the | |
187 | * parent's mount to fail with EBUSY). The performance | |
188 | * implications of replacing the open, read, and close with a | |
189 | * single stat is nice; but is not the main motivation for the | |
190 | * added complexity. | |
191 | */ | |
192 | return (dir_is_empty_stat(dirname)); | |
193 | } | |
194 | ||
34dc7c2f BB |
195 | /* |
196 | * Checks to see if the mount is active. If the filesystem is mounted, we fill | |
197 | * in 'where' with the current mountpoint, and return 1. Otherwise, we return | |
198 | * 0. | |
199 | */ | |
200 | boolean_t | |
201 | is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where) | |
202 | { | |
fb5f0bc8 | 203 | struct mnttab entry; |
34dc7c2f | 204 | |
fb5f0bc8 | 205 | if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0) |
34dc7c2f BB |
206 | return (B_FALSE); |
207 | ||
208 | if (where != NULL) | |
209 | *where = zfs_strdup(zfs_hdl, entry.mnt_mountp); | |
210 | ||
211 | return (B_TRUE); | |
212 | } | |
213 | ||
214 | boolean_t | |
215 | zfs_is_mounted(zfs_handle_t *zhp, char **where) | |
216 | { | |
217 | return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where)); | |
218 | } | |
219 | ||
68a192e4 KE |
220 | /* |
221 | * Checks any higher order concerns about whether the given dataset is | |
222 | * mountable, false otherwise. zfs_is_mountable_internal specifically assumes | |
223 | * that the caller has verified the sanity of mounting the dataset at | |
1f182103 | 224 | * its mountpoint to the extent the caller wants. |
68a192e4 KE |
225 | */ |
226 | static boolean_t | |
1f182103 | 227 | zfs_is_mountable_internal(zfs_handle_t *zhp) |
68a192e4 | 228 | { |
68a192e4 KE |
229 | if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) && |
230 | getzoneid() == GLOBAL_ZONEID) | |
231 | return (B_FALSE); | |
232 | ||
233 | return (B_TRUE); | |
234 | } | |
235 | ||
34dc7c2f BB |
236 | /* |
237 | * Returns true if the given dataset is mountable, false otherwise. Returns the | |
238 | * mountpoint in 'buf'. | |
239 | */ | |
b4d9a82f | 240 | static boolean_t |
34dc7c2f | 241 | zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen, |
30af21b0 | 242 | zprop_source_t *source, int flags) |
34dc7c2f | 243 | { |
eca7b760 | 244 | char sourceloc[MAXNAMELEN]; |
610cb4fb | 245 | zprop_source_t sourcetype; |
34dc7c2f | 246 | |
962d5242 TC |
247 | if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type, |
248 | B_FALSE)) | |
34dc7c2f BB |
249 | return (B_FALSE); |
250 | ||
251 | verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen, | |
252 | &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0); | |
253 | ||
254 | if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 || | |
255 | strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0) | |
256 | return (B_FALSE); | |
257 | ||
258 | if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF) | |
259 | return (B_FALSE); | |
260 | ||
1f182103 | 261 | if (!zfs_is_mountable_internal(zhp)) |
34dc7c2f BB |
262 | return (B_FALSE); |
263 | ||
30af21b0 PD |
264 | if (zfs_prop_get_int(zhp, ZFS_PROP_REDACTED) && !(flags & MS_FORCE)) |
265 | return (B_FALSE); | |
266 | ||
34dc7c2f BB |
267 | if (source) |
268 | *source = sourcetype; | |
269 | ||
270 | return (B_TRUE); | |
271 | } | |
272 | ||
3fb1fcde BB |
273 | /* |
274 | * The filesystem is mounted by invoking the system mount utility rather | |
275 | * than by the system call mount(2). This ensures that the /etc/mtab | |
276 | * file is correctly locked for the update. Performing our own locking | |
277 | * and /etc/mtab update requires making an unsafe assumption about how | |
278 | * the mount utility performs its locking. Unfortunately, this also means | |
279 | * in the case of a mount failure we do not have the exact errno. We must | |
280 | * make due with return value from the mount process. | |
281 | * | |
282 | * In the long term a shared library called libmount is under development | |
283 | * which provides a common API to address the locking and errno issues. | |
284 | * Once the standard mount utility has been updated to use this library | |
285 | * we can add an autoconf check to conditionally use it. | |
286 | * | |
287 | * http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html | |
288 | */ | |
289 | ||
2cf7f52b BB |
290 | static int |
291 | zfs_add_option(zfs_handle_t *zhp, char *options, int len, | |
292 | zfs_prop_t prop, char *on, char *off) | |
293 | { | |
294 | char *source; | |
295 | uint64_t value; | |
296 | ||
297 | /* Skip adding duplicate default options */ | |
298 | if ((strstr(options, on) != NULL) || (strstr(options, off) != NULL)) | |
299 | return (0); | |
300 | ||
301 | /* | |
79251738 | 302 | * zfs_prop_get_int() is not used to ensure our mount options |
303 | * are not influenced by the current /proc/self/mounts contents. | |
2cf7f52b BB |
304 | */ |
305 | value = getprop_uint64(zhp, prop, &source); | |
306 | ||
307 | (void) strlcat(options, ",", len); | |
308 | (void) strlcat(options, value ? on : off, len); | |
309 | ||
310 | return (0); | |
311 | } | |
312 | ||
313 | static int | |
314 | zfs_add_options(zfs_handle_t *zhp, char *options, int len) | |
315 | { | |
316 | int error = 0; | |
317 | ||
318 | error = zfs_add_option(zhp, options, len, | |
319 | ZFS_PROP_ATIME, MNTOPT_ATIME, MNTOPT_NOATIME); | |
67600771 CC |
320 | /* |
321 | * don't add relatime/strictatime when atime=off, otherwise strictatime | |
322 | * will force atime=on | |
323 | */ | |
324 | if (strstr(options, MNTOPT_NOATIME) == NULL) { | |
325 | error = zfs_add_option(zhp, options, len, | |
326 | ZFS_PROP_RELATIME, MNTOPT_RELATIME, MNTOPT_STRICTATIME); | |
327 | } | |
2cf7f52b BB |
328 | error = error ? error : zfs_add_option(zhp, options, len, |
329 | ZFS_PROP_DEVICES, MNTOPT_DEVICES, MNTOPT_NODEVICES); | |
330 | error = error ? error : zfs_add_option(zhp, options, len, | |
331 | ZFS_PROP_EXEC, MNTOPT_EXEC, MNTOPT_NOEXEC); | |
332 | error = error ? error : zfs_add_option(zhp, options, len, | |
333 | ZFS_PROP_READONLY, MNTOPT_RO, MNTOPT_RW); | |
334 | error = error ? error : zfs_add_option(zhp, options, len, | |
335 | ZFS_PROP_SETUID, MNTOPT_SETUID, MNTOPT_NOSETUID); | |
2cf7f52b BB |
336 | error = error ? error : zfs_add_option(zhp, options, len, |
337 | ZFS_PROP_NBMAND, MNTOPT_NBMAND, MNTOPT_NONBMAND); | |
338 | ||
339 | return (error); | |
340 | } | |
341 | ||
68a192e4 KE |
342 | int |
343 | zfs_mount(zfs_handle_t *zhp, const char *options, int flags) | |
344 | { | |
345 | char mountpoint[ZFS_MAXPROPLEN]; | |
346 | ||
347 | if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL, | |
348 | flags)) | |
349 | return (0); | |
350 | ||
351 | return (zfs_mount_at(zhp, options, flags, mountpoint)); | |
352 | } | |
353 | ||
34dc7c2f BB |
354 | /* |
355 | * Mount the given filesystem. | |
356 | */ | |
357 | int | |
68a192e4 KE |
358 | zfs_mount_at(zfs_handle_t *zhp, const char *options, int flags, |
359 | const char *mountpoint) | |
34dc7c2f BB |
360 | { |
361 | struct stat buf; | |
34dc7c2f | 362 | char mntopts[MNT_LINE_MAX]; |
9540be9b | 363 | char overlay[ZFS_MAXPROPLEN]; |
b3530c42 AZ |
364 | char prop_encroot[MAXNAMELEN]; |
365 | boolean_t is_encroot; | |
366 | zfs_handle_t *encroot_hp = zhp; | |
34dc7c2f | 367 | libzfs_handle_t *hdl = zhp->zfs_hdl; |
b5256303 | 368 | uint64_t keystatus; |
2cf7f52b | 369 | int remount = 0, rc; |
34dc7c2f | 370 | |
2cf7f52b | 371 | if (options == NULL) { |
3fb1fcde | 372 | (void) strlcpy(mntopts, MNTOPT_DEFAULTS, sizeof (mntopts)); |
2cf7f52b | 373 | } else { |
34dc7c2f | 374 | (void) strlcpy(mntopts, options, sizeof (mntopts)); |
2cf7f52b BB |
375 | } |
376 | ||
377 | if (strstr(mntopts, MNTOPT_REMOUNT) != NULL) | |
378 | remount = 1; | |
34dc7c2f | 379 | |
68a192e4 | 380 | /* Potentially duplicates some checks if invoked by zfs_mount(). */ |
1f182103 | 381 | if (!zfs_is_mountable_internal(zhp)) |
68a192e4 KE |
382 | return (0); |
383 | ||
572e2857 BB |
384 | /* |
385 | * If the pool is imported read-only then all mounts must be read-only | |
386 | */ | |
387 | if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL)) | |
3fb1fcde BB |
388 | (void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts)); |
389 | ||
2cf7f52b BB |
390 | /* |
391 | * Append default mount options which apply to the mount point. | |
392 | * This is done because under Linux (unlike Solaris) multiple mount | |
393 | * points may reference a single super block. This means that just | |
394 | * given a super block there is no back reference to update the per | |
395 | * mount point options. | |
396 | */ | |
397 | rc = zfs_add_options(zhp, mntopts, sizeof (mntopts)); | |
398 | if (rc) { | |
399 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, | |
400 | "default options unavailable")); | |
401 | return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, | |
402 | dgettext(TEXT_DOMAIN, "cannot mount '%s'"), | |
403 | mountpoint)); | |
404 | } | |
405 | ||
b5256303 TC |
406 | /* |
407 | * If the filesystem is encrypted the key must be loaded in order to | |
408 | * mount. If the key isn't loaded, the MS_CRYPT flag decides whether | |
409 | * or not we attempt to load the keys. Note: we must call | |
410 | * zfs_refresh_properties() here since some callers of this function | |
411 | * (most notably zpool_enable_datasets()) may implicitly load our key | |
412 | * by loading the parent's key first. | |
413 | */ | |
414 | if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) { | |
415 | zfs_refresh_properties(zhp); | |
416 | keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS); | |
417 | ||
418 | /* | |
419 | * If the key is unavailable and MS_CRYPT is set give the | |
420 | * user a chance to enter the key. Otherwise just fail | |
421 | * immediately. | |
422 | */ | |
423 | if (keystatus == ZFS_KEYSTATUS_UNAVAILABLE) { | |
424 | if (flags & MS_CRYPT) { | |
b3530c42 AZ |
425 | rc = zfs_crypto_get_encryption_root(zhp, |
426 | &is_encroot, prop_encroot); | |
427 | if (rc) { | |
428 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, | |
429 | "Failed to get encryption root for " | |
430 | "'%s'."), zfs_get_name(zhp)); | |
431 | return (rc); | |
432 | } | |
433 | ||
434 | if (!is_encroot) { | |
435 | encroot_hp = zfs_open(hdl, prop_encroot, | |
436 | ZFS_TYPE_DATASET); | |
437 | if (encroot_hp == NULL) | |
438 | return (hdl->libzfs_error); | |
439 | } | |
440 | ||
441 | rc = zfs_crypto_load_key(encroot_hp, | |
442 | B_FALSE, NULL); | |
443 | ||
444 | if (!is_encroot) | |
445 | zfs_close(encroot_hp); | |
b5256303 TC |
446 | if (rc) |
447 | return (rc); | |
448 | } else { | |
449 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, | |
450 | "encryption key not loaded")); | |
451 | return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, | |
452 | dgettext(TEXT_DOMAIN, "cannot mount '%s'"), | |
453 | mountpoint)); | |
454 | } | |
455 | } | |
456 | ||
457 | } | |
458 | ||
3fb1fcde BB |
459 | /* |
460 | * Append zfsutil option so the mount helper allow the mount | |
461 | */ | |
462 | strlcat(mntopts, "," MNTOPT_ZFSUTIL, sizeof (mntopts)); | |
572e2857 | 463 | |
34dc7c2f BB |
464 | /* Create the directory if it doesn't already exist */ |
465 | if (lstat(mountpoint, &buf) != 0) { | |
466 | if (mkdirp(mountpoint, 0755) != 0) { | |
467 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, | |
217f4837 RM |
468 | "failed to create mountpoint: %s"), |
469 | strerror(errno)); | |
34dc7c2f BB |
470 | return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, |
471 | dgettext(TEXT_DOMAIN, "cannot mount '%s'"), | |
472 | mountpoint)); | |
473 | } | |
474 | } | |
475 | ||
9540be9b | 476 | /* |
f5f6fb03 RM |
477 | * Overlay mounts are enabled by default but may be disabled |
478 | * via the 'overlay' property. The -O flag remains for compatibility. | |
9540be9b NB |
479 | */ |
480 | if (!(flags & MS_OVERLAY)) { | |
481 | if (zfs_prop_get(zhp, ZFS_PROP_OVERLAY, overlay, | |
02730c33 | 482 | sizeof (overlay), NULL, NULL, 0, B_FALSE) == 0) { |
9540be9b NB |
483 | if (strcmp(overlay, "on") == 0) { |
484 | flags |= MS_OVERLAY; | |
485 | } | |
486 | } | |
487 | } | |
488 | ||
34dc7c2f BB |
489 | /* |
490 | * Determine if the mountpoint is empty. If so, refuse to perform the | |
e18be9a6 | 491 | * mount. We don't perform this check if 'remount' is |
f5f6fb03 | 492 | * specified or if overlay option (-O) is given |
34dc7c2f | 493 | */ |
e18be9a6 SC |
494 | if ((flags & MS_OVERLAY) == 0 && !remount && |
495 | !dir_is_empty(mountpoint)) { | |
34dc7c2f BB |
496 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, |
497 | "directory is not empty")); | |
498 | return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, | |
499 | dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint)); | |
500 | } | |
501 | ||
502 | /* perform the mount */ | |
501a1511 | 503 | rc = do_mount(zhp, mountpoint, mntopts, flags); |
3fb1fcde | 504 | if (rc) { |
34dc7c2f BB |
505 | /* |
506 | * Generic errors are nasty, but there are just way too many | |
507 | * from mount(), and they're well-understood. We pick a few | |
508 | * common ones to improve upon. | |
509 | */ | |
3fb1fcde | 510 | if (rc == EBUSY) { |
34dc7c2f BB |
511 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, |
512 | "mountpoint or dataset is busy")); | |
3fb1fcde | 513 | } else if (rc == EPERM) { |
34dc7c2f BB |
514 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, |
515 | "Insufficient privileges")); | |
3fb1fcde | 516 | } else if (rc == ENOTSUP) { |
428870ff BB |
517 | int spa_version; |
518 | ||
519 | VERIFY(zfs_spa_version(zhp, &spa_version) == 0); | |
f00f4690 AZ |
520 | zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, |
521 | "Can't mount a version %llu " | |
428870ff BB |
522 | "file system on a version %d pool. Pool must be" |
523 | " upgraded to mount this file system."), | |
524 | (u_longlong_t)zfs_prop_get_int(zhp, | |
525 | ZFS_PROP_VERSION), spa_version); | |
34dc7c2f | 526 | } else { |
f00f4690 | 527 | zfs_error_aux(hdl, "%s", strerror(rc)); |
34dc7c2f | 528 | } |
34dc7c2f BB |
529 | return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED, |
530 | dgettext(TEXT_DOMAIN, "cannot mount '%s'"), | |
531 | zhp->zfs_name)); | |
532 | } | |
533 | ||
2cf7f52b BB |
534 | /* remove the mounted entry before re-adding on remount */ |
535 | if (remount) | |
536 | libzfs_mnttab_remove(hdl, zhp->zfs_name); | |
537 | ||
fb5f0bc8 | 538 | /* add the mounted entry into our cache */ |
3fb1fcde | 539 | libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint, mntopts); |
34dc7c2f BB |
540 | return (0); |
541 | } | |
542 | ||
543 | /* | |
544 | * Unmount a single filesystem. | |
545 | */ | |
546 | static int | |
41eba770 | 547 | unmount_one(zfs_handle_t *zhp, const char *mountpoint, int flags) |
34dc7c2f | 548 | { |
9ac97c2a BB |
549 | int error; |
550 | ||
41eba770 | 551 | error = do_unmount(zhp, mountpoint, flags); |
9ac97c2a | 552 | if (error != 0) { |
f5ada653 DB |
553 | int libzfs_err; |
554 | ||
555 | switch (error) { | |
556 | case EBUSY: | |
557 | libzfs_err = EZFS_BUSY; | |
558 | break; | |
559 | case EIO: | |
560 | libzfs_err = EZFS_IO; | |
561 | break; | |
562 | case ENOENT: | |
563 | libzfs_err = EZFS_NOENT; | |
564 | break; | |
565 | case ENOMEM: | |
566 | libzfs_err = EZFS_NOMEM; | |
567 | break; | |
568 | case EPERM: | |
569 | libzfs_err = EZFS_PERM; | |
570 | break; | |
571 | default: | |
572 | libzfs_err = EZFS_UMOUNTFAILED; | |
573 | } | |
5dc6fc2b RE |
574 | if (zhp) { |
575 | return (zfs_error_fmt(zhp->zfs_hdl, libzfs_err, | |
576 | dgettext(TEXT_DOMAIN, "cannot unmount '%s'"), | |
577 | mountpoint)); | |
578 | } else { | |
579 | return (-1); | |
580 | } | |
34dc7c2f BB |
581 | } |
582 | ||
583 | return (0); | |
584 | } | |
585 | ||
586 | /* | |
587 | * Unmount the given filesystem. | |
588 | */ | |
589 | int | |
590 | zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags) | |
591 | { | |
fb5f0bc8 BB |
592 | libzfs_handle_t *hdl = zhp->zfs_hdl; |
593 | struct mnttab entry; | |
34dc7c2f | 594 | char *mntpt = NULL; |
765d1f06 | 595 | boolean_t encroot, unmounted = B_FALSE; |
34dc7c2f | 596 | |
fb5f0bc8 | 597 | /* check to see if we need to unmount the filesystem */ |
34dc7c2f | 598 | if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) && |
fb5f0bc8 | 599 | libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) { |
34dc7c2f BB |
600 | /* |
601 | * mountpoint may have come from a call to | |
602 | * getmnt/getmntany if it isn't NULL. If it is NULL, | |
fb5f0bc8 BB |
603 | * we know it comes from libzfs_mnttab_find which can |
604 | * then get freed later. We strdup it to play it safe. | |
34dc7c2f BB |
605 | */ |
606 | if (mountpoint == NULL) | |
1bf490ba | 607 | mntpt = zfs_strdup(hdl, entry.mnt_mountp); |
34dc7c2f | 608 | else |
fb5f0bc8 | 609 | mntpt = zfs_strdup(hdl, mountpoint); |
34dc7c2f BB |
610 | |
611 | /* | |
612 | * Unshare and unmount the filesystem | |
613 | */ | |
b4d9a82f | 614 | if (zfs_unshare(zhp, mntpt, share_all_proto) != 0) { |
2d96d7aa | 615 | free(mntpt); |
34dc7c2f | 616 | return (-1); |
2d96d7aa | 617 | } |
b4d9a82f | 618 | zfs_commit_shares(NULL); |
34dc7c2f | 619 | |
41eba770 | 620 | if (unmount_one(zhp, mntpt, flags) != 0) { |
34dc7c2f | 621 | free(mntpt); |
b4d9a82f AZ |
622 | (void) zfs_share(zhp, NULL); |
623 | zfs_commit_shares(NULL); | |
34dc7c2f BB |
624 | return (-1); |
625 | } | |
765d1f06 | 626 | |
fb5f0bc8 | 627 | libzfs_mnttab_remove(hdl, zhp->zfs_name); |
34dc7c2f | 628 | free(mntpt); |
765d1f06 TC |
629 | unmounted = B_TRUE; |
630 | } | |
631 | ||
632 | /* | |
633 | * If the MS_CRYPT flag is provided we must ensure we attempt to | |
634 | * unload the dataset's key regardless of whether we did any work | |
635 | * to unmount it. We only do this for encryption roots. | |
636 | */ | |
637 | if ((flags & MS_CRYPT) != 0 && | |
638 | zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) { | |
639 | zfs_refresh_properties(zhp); | |
640 | ||
641 | if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0 && | |
642 | unmounted) { | |
643 | (void) zfs_mount(zhp, NULL, 0); | |
644 | return (-1); | |
645 | } | |
646 | ||
647 | if (encroot && zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) == | |
648 | ZFS_KEYSTATUS_AVAILABLE && | |
649 | zfs_crypto_unload_key(zhp) != 0) { | |
650 | (void) zfs_mount(zhp, NULL, 0); | |
651 | return (-1); | |
652 | } | |
34dc7c2f BB |
653 | } |
654 | ||
3e8d5e4f JL |
655 | zpool_disable_volume_os(zhp->zfs_name); |
656 | ||
34dc7c2f BB |
657 | return (0); |
658 | } | |
659 | ||
660 | /* | |
661 | * Unmount this filesystem and any children inheriting the mountpoint property. | |
662 | * To do this, just act like we're changing the mountpoint property, but don't | |
663 | * remount the filesystems afterwards. | |
664 | */ | |
665 | int | |
666 | zfs_unmountall(zfs_handle_t *zhp, int flags) | |
667 | { | |
668 | prop_changelist_t *clp; | |
669 | int ret; | |
670 | ||
50a343d8 | 671 | clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, |
765d1f06 | 672 | CL_GATHER_ITER_MOUNTED, flags); |
34dc7c2f BB |
673 | if (clp == NULL) |
674 | return (-1); | |
675 | ||
676 | ret = changelist_prefix(clp); | |
677 | changelist_free(clp); | |
678 | ||
679 | return (ret); | |
680 | } | |
681 | ||
c15d36c6 GW |
682 | /* |
683 | * Unshare a filesystem by mountpoint. | |
684 | */ | |
b4d9a82f | 685 | static int |
c15d36c6 | 686 | unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint, |
471e9a10 | 687 | enum sa_protocol proto) |
c15d36c6 | 688 | { |
471e9a10 AZ |
689 | int err = sa_disable_share(mountpoint, proto); |
690 | if (err != SA_OK) | |
c15d36c6 GW |
691 | return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err, |
692 | dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"), | |
693 | name, sa_errorstr(err))); | |
471e9a10 | 694 | |
c15d36c6 GW |
695 | return (0); |
696 | } | |
697 | ||
c15d36c6 GW |
698 | /* |
699 | * Share the given filesystem according to the options in the specified | |
700 | * protocol specific properties (sharenfs, sharesmb). We rely | |
701 | * on "libshare" to do the dirty work for us. | |
702 | */ | |
703 | int | |
b4d9a82f | 704 | zfs_share(zfs_handle_t *zhp, const enum sa_protocol *proto) |
c15d36c6 GW |
705 | { |
706 | char mountpoint[ZFS_MAXPROPLEN]; | |
707 | char shareopts[ZFS_MAXPROPLEN]; | |
708 | char sourcestr[ZFS_MAXPROPLEN]; | |
471e9a10 | 709 | const enum sa_protocol *curr_proto; |
610cb4fb | 710 | zprop_source_t sourcetype; |
c15d36c6 GW |
711 | int err = 0; |
712 | ||
b4d9a82f AZ |
713 | if (proto == NULL) |
714 | proto = share_all_proto; | |
715 | ||
c15d36c6 GW |
716 | if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL, 0)) |
717 | return (0); | |
718 | ||
471e9a10 | 719 | for (curr_proto = proto; *curr_proto != SA_NO_PROTOCOL; curr_proto++) { |
c15d36c6 GW |
720 | /* |
721 | * Return success if there are no share options. | |
722 | */ | |
723 | if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop, | |
724 | shareopts, sizeof (shareopts), &sourcetype, sourcestr, | |
725 | ZFS_MAXPROPLEN, B_FALSE) != 0 || | |
726 | strcmp(shareopts, "off") == 0) | |
727 | continue; | |
728 | ||
729 | /* | |
730 | * If the 'zoned' property is set, then zfs_is_mountable() | |
731 | * will have already bailed out if we are in the global zone. | |
732 | * But local zones cannot be NFS servers, so we ignore it for | |
733 | * local zones as well. | |
734 | */ | |
735 | if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) | |
736 | continue; | |
737 | ||
738 | err = sa_enable_share(zfs_get_name(zhp), mountpoint, shareopts, | |
471e9a10 | 739 | *curr_proto); |
c15d36c6 GW |
740 | if (err != SA_OK) { |
741 | return (zfs_error_fmt(zhp->zfs_hdl, | |
742 | proto_table[*curr_proto].p_share_err, | |
743 | dgettext(TEXT_DOMAIN, "cannot share '%s: %s'"), | |
744 | zfs_get_name(zhp), sa_errorstr(err))); | |
745 | } | |
746 | ||
747 | } | |
748 | return (0); | |
749 | } | |
750 | ||
34dc7c2f BB |
751 | /* |
752 | * Check to see if the filesystem is currently shared. | |
753 | */ | |
34dc7c2f | 754 | boolean_t |
b4d9a82f AZ |
755 | zfs_is_shared(zfs_handle_t *zhp, char **where, |
756 | const enum sa_protocol *proto) | |
34dc7c2f | 757 | { |
b4d9a82f AZ |
758 | char *mountpoint; |
759 | if (proto == NULL) | |
760 | proto = share_all_proto; | |
34dc7c2f | 761 | |
b4d9a82f AZ |
762 | if (ZFS_IS_VOLUME(zhp)) |
763 | return (B_FALSE); | |
c15d36c6 | 764 | |
b4d9a82f AZ |
765 | if (!zfs_is_mounted(zhp, &mountpoint)) |
766 | return (B_FALSE); | |
c15d36c6 | 767 | |
b4d9a82f AZ |
768 | for (const enum sa_protocol *p = proto; *p != SA_NO_PROTOCOL; ++p) |
769 | if (sa_is_shared(mountpoint, *p)) { | |
770 | if (where != NULL) | |
771 | *where = mountpoint; | |
772 | else | |
773 | free(mountpoint); | |
774 | return (B_TRUE); | |
775 | } | |
c15d36c6 | 776 | |
b4d9a82f AZ |
777 | free(mountpoint); |
778 | return (B_FALSE); | |
c15d36c6 GW |
779 | } |
780 | ||
781 | void | |
b4d9a82f | 782 | zfs_commit_shares(const enum sa_protocol *proto) |
c15d36c6 GW |
783 | { |
784 | if (proto == NULL) | |
b4d9a82f | 785 | proto = share_all_proto; |
34dc7c2f | 786 | |
b4d9a82f AZ |
787 | for (const enum sa_protocol *p = proto; *p != SA_NO_PROTOCOL; ++p) |
788 | sa_commit_shares(*p); | |
34dc7c2f BB |
789 | } |
790 | ||
34dc7c2f BB |
791 | /* |
792 | * Unshare the given filesystem. | |
793 | */ | |
794 | int | |
b4d9a82f | 795 | zfs_unshare(zfs_handle_t *zhp, const char *mountpoint, |
471e9a10 | 796 | const enum sa_protocol *proto) |
34dc7c2f | 797 | { |
fb5f0bc8 BB |
798 | libzfs_handle_t *hdl = zhp->zfs_hdl; |
799 | struct mnttab entry; | |
34dc7c2f BB |
800 | char *mntpt = NULL; |
801 | ||
b4d9a82f AZ |
802 | if (proto == NULL) |
803 | proto = share_all_proto; | |
804 | ||
34dc7c2f | 805 | /* check to see if need to unmount the filesystem */ |
34dc7c2f | 806 | if (mountpoint != NULL) |
2d96d7aa | 807 | mntpt = zfs_strdup(hdl, mountpoint); |
34dc7c2f BB |
808 | |
809 | if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) && | |
fb5f0bc8 | 810 | libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) { |
34dc7c2f BB |
811 | |
812 | if (mountpoint == NULL) | |
813 | mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp); | |
814 | ||
b4d9a82f AZ |
815 | for (const enum sa_protocol *curr_proto = proto; |
816 | *curr_proto != SA_NO_PROTOCOL; curr_proto++) { | |
34dc7c2f | 817 | |
b4d9a82f | 818 | if (sa_is_shared(mntpt, *curr_proto)) { |
c15d36c6 GW |
819 | if (unshare_one(hdl, zhp->zfs_name, |
820 | mntpt, *curr_proto) != 0) { | |
821 | if (mntpt != NULL) | |
822 | free(mntpt); | |
823 | return (-1); | |
824 | } | |
34dc7c2f BB |
825 | } |
826 | } | |
827 | } | |
828 | if (mntpt != NULL) | |
829 | free(mntpt); | |
830 | ||
831 | return (0); | |
832 | } | |
833 | ||
34dc7c2f BB |
834 | /* |
835 | * Same as zfs_unmountall(), but for NFS and SMB unshares. | |
836 | */ | |
b4d9a82f AZ |
837 | int |
838 | zfs_unshareall(zfs_handle_t *zhp, const enum sa_protocol *proto) | |
34dc7c2f BB |
839 | { |
840 | prop_changelist_t *clp; | |
841 | int ret; | |
842 | ||
b4d9a82f AZ |
843 | if (proto == NULL) |
844 | proto = share_all_proto; | |
845 | ||
b128c09f | 846 | clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0); |
34dc7c2f BB |
847 | if (clp == NULL) |
848 | return (-1); | |
849 | ||
850 | ret = changelist_unshare(clp, proto); | |
851 | changelist_free(clp); | |
852 | ||
853 | return (ret); | |
854 | } | |
855 | ||
34dc7c2f BB |
856 | /* |
857 | * Remove the mountpoint associated with the current dataset, if necessary. | |
858 | * We only remove the underlying directory if: | |
859 | * | |
860 | * - The mountpoint is not 'none' or 'legacy' | |
861 | * - The mountpoint is non-empty | |
862 | * - The mountpoint is the default or inherited | |
863 | * - The 'zoned' property is set, or we're in a local zone | |
864 | * | |
865 | * Any other directories we leave alone. | |
866 | */ | |
867 | void | |
868 | remove_mountpoint(zfs_handle_t *zhp) | |
869 | { | |
870 | char mountpoint[ZFS_MAXPROPLEN]; | |
871 | zprop_source_t source; | |
872 | ||
73cdcc63 MM |
873 | if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), |
874 | &source, 0)) | |
34dc7c2f BB |
875 | return; |
876 | ||
877 | if (source == ZPROP_SRC_DEFAULT || | |
878 | source == ZPROP_SRC_INHERITED) { | |
879 | /* | |
880 | * Try to remove the directory, silently ignoring any errors. | |
881 | * The filesystem may have since been removed or moved around, | |
882 | * and this error isn't really useful to the administrator in | |
883 | * any way. | |
884 | */ | |
885 | (void) rmdir(mountpoint); | |
886 | } | |
887 | } | |
888 | ||
a10d50f9 SR |
889 | /* |
890 | * Add the given zfs handle to the cb_handles array, dynamically reallocating | |
891 | * the array if it is out of space. | |
892 | */ | |
572e2857 BB |
893 | void |
894 | libzfs_add_handle(get_all_cb_t *cbp, zfs_handle_t *zhp) | |
895 | { | |
896 | if (cbp->cb_alloc == cbp->cb_used) { | |
897 | size_t newsz; | |
a10d50f9 | 898 | zfs_handle_t **newhandles; |
572e2857 | 899 | |
a10d50f9 SR |
900 | newsz = cbp->cb_alloc != 0 ? cbp->cb_alloc * 2 : 64; |
901 | newhandles = zfs_realloc(zhp->zfs_hdl, | |
902 | cbp->cb_handles, cbp->cb_alloc * sizeof (zfs_handle_t *), | |
903 | newsz * sizeof (zfs_handle_t *)); | |
904 | cbp->cb_handles = newhandles; | |
572e2857 BB |
905 | cbp->cb_alloc = newsz; |
906 | } | |
907 | cbp->cb_handles[cbp->cb_used++] = zhp; | |
908 | } | |
34dc7c2f | 909 | |
a10d50f9 SR |
910 | /* |
911 | * Recursive helper function used during file system enumeration | |
912 | */ | |
34dc7c2f | 913 | static int |
a10d50f9 | 914 | zfs_iter_cb(zfs_handle_t *zhp, void *data) |
34dc7c2f | 915 | { |
572e2857 | 916 | get_all_cb_t *cbp = data; |
34dc7c2f | 917 | |
572e2857 | 918 | if (!(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM)) { |
34dc7c2f BB |
919 | zfs_close(zhp); |
920 | return (0); | |
921 | } | |
922 | ||
923 | if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) { | |
924 | zfs_close(zhp); | |
925 | return (0); | |
926 | } | |
927 | ||
b5256303 TC |
928 | if (zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) == |
929 | ZFS_KEYSTATUS_UNAVAILABLE) { | |
930 | zfs_close(zhp); | |
931 | return (0); | |
932 | } | |
933 | ||
47dfff3b MA |
934 | /* |
935 | * If this filesystem is inconsistent and has a receive resume | |
936 | * token, we can not mount it. | |
937 | */ | |
938 | if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) && | |
939 | zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN, | |
940 | NULL, 0, NULL, NULL, 0, B_TRUE) == 0) { | |
941 | zfs_close(zhp); | |
942 | return (0); | |
943 | } | |
944 | ||
572e2857 | 945 | libzfs_add_handle(cbp, zhp); |
399b9819 | 946 | if (zfs_iter_filesystems(zhp, zfs_iter_cb, cbp) != 0) { |
572e2857 BB |
947 | zfs_close(zhp); |
948 | return (-1); | |
34dc7c2f | 949 | } |
572e2857 | 950 | return (0); |
34dc7c2f BB |
951 | } |
952 | ||
a10d50f9 SR |
953 | /* |
954 | * Sort comparator that compares two mountpoint paths. We sort these paths so | |
955 | * that subdirectories immediately follow their parents. This means that we | |
e63ac16d AF |
956 | * effectively treat the '/' character as the lowest value non-nul char. |
957 | * Since filesystems from non-global zones can have the same mountpoint | |
958 | * as other filesystems, the comparator sorts global zone filesystems to | |
959 | * the top of the list. This means that the global zone will traverse the | |
960 | * filesystem list in the correct order and can stop when it sees the | |
961 | * first zoned filesystem. In a non-global zone, only the delegated | |
962 | * filesystems are seen. | |
963 | * | |
964 | * An example sorted list using this comparator would look like: | |
a10d50f9 SR |
965 | * |
966 | * /foo | |
967 | * /foo/bar | |
968 | * /foo/bar/baz | |
969 | * /foo/baz | |
970 | * /foo.bar | |
e63ac16d AF |
971 | * /foo (NGZ1) |
972 | * /foo (NGZ2) | |
a10d50f9 SR |
973 | * |
974 | * The mounting code depends on this ordering to deterministically iterate | |
975 | * over filesystems in order to spawn parallel mount tasks. | |
976 | */ | |
e63ac16d | 977 | static int |
a10d50f9 | 978 | mountpoint_cmp(const void *arga, const void *argb) |
34dc7c2f | 979 | { |
a10d50f9 SR |
980 | zfs_handle_t *const *zap = arga; |
981 | zfs_handle_t *za = *zap; | |
982 | zfs_handle_t *const *zbp = argb; | |
983 | zfs_handle_t *zb = *zbp; | |
34dc7c2f BB |
984 | char mounta[MAXPATHLEN]; |
985 | char mountb[MAXPATHLEN]; | |
a10d50f9 SR |
986 | const char *a = mounta; |
987 | const char *b = mountb; | |
34dc7c2f | 988 | boolean_t gota, gotb; |
e63ac16d AF |
989 | uint64_t zoneda, zonedb; |
990 | ||
991 | zoneda = zfs_prop_get_int(za, ZFS_PROP_ZONED); | |
992 | zonedb = zfs_prop_get_int(zb, ZFS_PROP_ZONED); | |
993 | if (zoneda && !zonedb) | |
994 | return (1); | |
995 | if (!zoneda && zonedb) | |
996 | return (-1); | |
34dc7c2f | 997 | |
a10d50f9 SR |
998 | gota = (zfs_get_type(za) == ZFS_TYPE_FILESYSTEM); |
999 | if (gota) { | |
1000 | verify(zfs_prop_get(za, ZFS_PROP_MOUNTPOINT, mounta, | |
34dc7c2f | 1001 | sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0); |
a10d50f9 SR |
1002 | } |
1003 | gotb = (zfs_get_type(zb) == ZFS_TYPE_FILESYSTEM); | |
1004 | if (gotb) { | |
1005 | verify(zfs_prop_get(zb, ZFS_PROP_MOUNTPOINT, mountb, | |
34dc7c2f | 1006 | sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0); |
a10d50f9 | 1007 | } |
34dc7c2f | 1008 | |
a10d50f9 SR |
1009 | if (gota && gotb) { |
1010 | while (*a != '\0' && (*a == *b)) { | |
1011 | a++; | |
1012 | b++; | |
1013 | } | |
1014 | if (*a == *b) | |
1015 | return (0); | |
1016 | if (*a == '\0') | |
1017 | return (-1); | |
1018 | if (*b == '\0') | |
1019 | return (1); | |
1020 | if (*a == '/') | |
1021 | return (-1); | |
1022 | if (*b == '/') | |
1023 | return (1); | |
1024 | return (*a < *b ? -1 : *a > *b); | |
1025 | } | |
34dc7c2f BB |
1026 | |
1027 | if (gota) | |
1028 | return (-1); | |
1029 | if (gotb) | |
1030 | return (1); | |
1031 | ||
a10d50f9 SR |
1032 | /* |
1033 | * If neither filesystem has a mountpoint, revert to sorting by | |
1034 | * dataset name. | |
1035 | */ | |
1036 | return (strcmp(zfs_get_name(za), zfs_get_name(zb))); | |
34dc7c2f BB |
1037 | } |
1038 | ||
1039 | /* | |
ab5036df TK |
1040 | * Return true if path2 is a child of path1 or path2 equals path1 or |
1041 | * path1 is "/" (path2 is always a child of "/"). | |
34dc7c2f | 1042 | */ |
a10d50f9 SR |
1043 | static boolean_t |
1044 | libzfs_path_contains(const char *path1, const char *path2) | |
34dc7c2f | 1045 | { |
ab5036df TK |
1046 | return (strcmp(path1, path2) == 0 || strcmp(path1, "/") == 0 || |
1047 | (strstr(path2, path1) == path2 && path2[strlen(path1)] == '/')); | |
a10d50f9 SR |
1048 | } |
1049 | ||
1050 | /* | |
1051 | * Given a mountpoint specified by idx in the handles array, find the first | |
1052 | * non-descendent of that mountpoint and return its index. Descendant paths | |
1053 | * start with the parent's path. This function relies on the ordering | |
1054 | * enforced by mountpoint_cmp(). | |
1055 | */ | |
1056 | static int | |
1057 | non_descendant_idx(zfs_handle_t **handles, size_t num_handles, int idx) | |
1058 | { | |
1059 | char parent[ZFS_MAXPROPLEN]; | |
1060 | char child[ZFS_MAXPROPLEN]; | |
1061 | int i; | |
1062 | ||
1063 | verify(zfs_prop_get(handles[idx], ZFS_PROP_MOUNTPOINT, parent, | |
1064 | sizeof (parent), NULL, NULL, 0, B_FALSE) == 0); | |
1065 | ||
1066 | for (i = idx + 1; i < num_handles; i++) { | |
1067 | verify(zfs_prop_get(handles[i], ZFS_PROP_MOUNTPOINT, child, | |
1068 | sizeof (child), NULL, NULL, 0, B_FALSE) == 0); | |
1069 | if (!libzfs_path_contains(parent, child)) | |
1070 | break; | |
1071 | } | |
1072 | return (i); | |
1073 | } | |
1074 | ||
1075 | typedef struct mnt_param { | |
1076 | libzfs_handle_t *mnt_hdl; | |
1077 | tpool_t *mnt_tp; | |
1078 | zfs_handle_t **mnt_zhps; /* filesystems to mount */ | |
1079 | size_t mnt_num_handles; | |
1080 | int mnt_idx; /* Index of selected entry to mount */ | |
1081 | zfs_iter_f mnt_func; | |
1082 | void *mnt_data; | |
1083 | } mnt_param_t; | |
1084 | ||
1085 | /* | |
1086 | * Allocate and populate the parameter struct for mount function, and | |
1087 | * schedule mounting of the entry selected by idx. | |
1088 | */ | |
1089 | static void | |
1090 | zfs_dispatch_mount(libzfs_handle_t *hdl, zfs_handle_t **handles, | |
1091 | size_t num_handles, int idx, zfs_iter_f func, void *data, tpool_t *tp) | |
1092 | { | |
1093 | mnt_param_t *mnt_param = zfs_alloc(hdl, sizeof (mnt_param_t)); | |
34dc7c2f | 1094 | |
a10d50f9 SR |
1095 | mnt_param->mnt_hdl = hdl; |
1096 | mnt_param->mnt_tp = tp; | |
1097 | mnt_param->mnt_zhps = handles; | |
1098 | mnt_param->mnt_num_handles = num_handles; | |
1099 | mnt_param->mnt_idx = idx; | |
1100 | mnt_param->mnt_func = func; | |
1101 | mnt_param->mnt_data = data; | |
1102 | ||
1103 | (void) tpool_dispatch(tp, zfs_mount_task, (void*)mnt_param); | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * This is the structure used to keep state of mounting or sharing operations | |
1108 | * during a call to zpool_enable_datasets(). | |
1109 | */ | |
1110 | typedef struct mount_state { | |
34dc7c2f | 1111 | /* |
a10d50f9 SR |
1112 | * ms_mntstatus is set to -1 if any mount fails. While multiple threads |
1113 | * could update this variable concurrently, no synchronization is | |
1114 | * needed as it's only ever set to -1. | |
34dc7c2f | 1115 | */ |
a10d50f9 SR |
1116 | int ms_mntstatus; |
1117 | int ms_mntflags; | |
1118 | const char *ms_mntopts; | |
1119 | } mount_state_t; | |
1120 | ||
1121 | static int | |
1122 | zfs_mount_one(zfs_handle_t *zhp, void *arg) | |
1123 | { | |
1124 | mount_state_t *ms = arg; | |
1125 | int ret = 0; | |
34dc7c2f | 1126 | |
34dc7c2f | 1127 | /* |
a10d50f9 SR |
1128 | * don't attempt to mount encrypted datasets with |
1129 | * unloaded keys | |
34dc7c2f | 1130 | */ |
a10d50f9 SR |
1131 | if (zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) == |
1132 | ZFS_KEYSTATUS_UNAVAILABLE) | |
1133 | return (0); | |
1134 | ||
1135 | if (zfs_mount(zhp, ms->ms_mntopts, ms->ms_mntflags) != 0) | |
1136 | ret = ms->ms_mntstatus = -1; | |
1137 | return (ret); | |
1138 | } | |
1139 | ||
1140 | static int | |
1141 | zfs_share_one(zfs_handle_t *zhp, void *arg) | |
1142 | { | |
1143 | mount_state_t *ms = arg; | |
1144 | int ret = 0; | |
1145 | ||
b4d9a82f | 1146 | if (zfs_share(zhp, NULL) != 0) |
a10d50f9 SR |
1147 | ret = ms->ms_mntstatus = -1; |
1148 | return (ret); | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Thread pool function to mount one file system. On completion, it finds and | |
1153 | * schedules its children to be mounted. This depends on the sorting done in | |
1154 | * zfs_foreach_mountpoint(). Note that the degenerate case (chain of entries | |
1155 | * each descending from the previous) will have no parallelism since we always | |
1156 | * have to wait for the parent to finish mounting before we can schedule | |
1157 | * its children. | |
1158 | */ | |
1159 | static void | |
1160 | zfs_mount_task(void *arg) | |
1161 | { | |
1162 | mnt_param_t *mp = arg; | |
1163 | int idx = mp->mnt_idx; | |
1164 | zfs_handle_t **handles = mp->mnt_zhps; | |
1165 | size_t num_handles = mp->mnt_num_handles; | |
1166 | char mountpoint[ZFS_MAXPROPLEN]; | |
1167 | ||
1168 | verify(zfs_prop_get(handles[idx], ZFS_PROP_MOUNTPOINT, mountpoint, | |
1169 | sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0); | |
1170 | ||
1171 | if (mp->mnt_func(handles[idx], mp->mnt_data) != 0) | |
3c617c79 | 1172 | goto out; |
34dc7c2f BB |
1173 | |
1174 | /* | |
a10d50f9 SR |
1175 | * We dispatch tasks to mount filesystems with mountpoints underneath |
1176 | * this one. We do this by dispatching the next filesystem with a | |
1177 | * descendant mountpoint of the one we just mounted, then skip all of | |
1178 | * its descendants, dispatch the next descendant mountpoint, and so on. | |
1179 | * The non_descendant_idx() function skips over filesystems that are | |
1180 | * descendants of the filesystem we just dispatched. | |
34dc7c2f | 1181 | */ |
a10d50f9 SR |
1182 | for (int i = idx + 1; i < num_handles; |
1183 | i = non_descendant_idx(handles, num_handles, i)) { | |
1184 | char child[ZFS_MAXPROPLEN]; | |
1185 | verify(zfs_prop_get(handles[i], ZFS_PROP_MOUNTPOINT, | |
1186 | child, sizeof (child), NULL, NULL, 0, B_FALSE) == 0); | |
1187 | ||
1188 | if (!libzfs_path_contains(mountpoint, child)) | |
1189 | break; /* not a descendant, return */ | |
1190 | zfs_dispatch_mount(mp->mnt_hdl, handles, num_handles, i, | |
1191 | mp->mnt_func, mp->mnt_data, mp->mnt_tp); | |
1192 | } | |
3c617c79 AZ |
1193 | |
1194 | out: | |
a10d50f9 SR |
1195 | free(mp); |
1196 | } | |
d164b209 | 1197 | |
a10d50f9 SR |
1198 | /* |
1199 | * Issue the func callback for each ZFS handle contained in the handles | |
1200 | * array. This function is used to mount all datasets, and so this function | |
1201 | * guarantees that filesystems for parent mountpoints are called before their | |
1202 | * children. As such, before issuing any callbacks, we first sort the array | |
1203 | * of handles by mountpoint. | |
1204 | * | |
1205 | * Callbacks are issued in one of two ways: | |
1206 | * | |
1207 | * 1. Sequentially: If the parallel argument is B_FALSE or the ZFS_SERIAL_MOUNT | |
1208 | * environment variable is set, then we issue callbacks sequentially. | |
1209 | * | |
1210 | * 2. In parallel: If the parallel argument is B_TRUE and the ZFS_SERIAL_MOUNT | |
1211 | * environment variable is not set, then we use a tpool to dispatch threads | |
1212 | * to mount filesystems in parallel. This function dispatches tasks to mount | |
1213 | * the filesystems at the top-level mountpoints, and these tasks in turn | |
1214 | * are responsible for recursively mounting filesystems in their children | |
1215 | * mountpoints. | |
1216 | */ | |
1217 | void | |
1218 | zfs_foreach_mountpoint(libzfs_handle_t *hdl, zfs_handle_t **handles, | |
1219 | size_t num_handles, zfs_iter_f func, void *data, boolean_t parallel) | |
1220 | { | |
e63ac16d AF |
1221 | zoneid_t zoneid = getzoneid(); |
1222 | ||
a10d50f9 SR |
1223 | /* |
1224 | * The ZFS_SERIAL_MOUNT environment variable is an undocumented | |
1225 | * variable that can be used as a convenience to do a/b comparison | |
1226 | * of serial vs. parallel mounting. | |
1227 | */ | |
1228 | boolean_t serial_mount = !parallel || | |
1229 | (getenv("ZFS_SERIAL_MOUNT") != NULL); | |
b5256303 | 1230 | |
a10d50f9 SR |
1231 | /* |
1232 | * Sort the datasets by mountpoint. See mountpoint_cmp for details | |
1233 | * of how these are sorted. | |
1234 | */ | |
1235 | qsort(handles, num_handles, sizeof (zfs_handle_t *), mountpoint_cmp); | |
1236 | ||
1237 | if (serial_mount) { | |
1238 | for (int i = 0; i < num_handles; i++) { | |
1239 | func(handles[i], data); | |
1240 | } | |
1241 | return; | |
34dc7c2f BB |
1242 | } |
1243 | ||
1244 | /* | |
a10d50f9 SR |
1245 | * Issue the callback function for each dataset using a parallel |
1246 | * algorithm that uses a thread pool to manage threads. | |
1247 | */ | |
1248 | tpool_t *tp = tpool_create(1, mount_tp_nthr, 0, NULL); | |
1249 | ||
1250 | /* | |
1251 | * There may be multiple "top level" mountpoints outside of the pool's | |
1252 | * root mountpoint, e.g.: /foo /bar. Dispatch a mount task for each of | |
1253 | * these. | |
34dc7c2f | 1254 | */ |
a10d50f9 SR |
1255 | for (int i = 0; i < num_handles; |
1256 | i = non_descendant_idx(handles, num_handles, i)) { | |
e63ac16d AF |
1257 | /* |
1258 | * Since the mountpoints have been sorted so that the zoned | |
1259 | * filesystems are at the end, a zoned filesystem seen from | |
1260 | * the global zone means that we're done. | |
1261 | */ | |
1262 | if (zoneid == GLOBAL_ZONEID && | |
1263 | zfs_prop_get_int(handles[i], ZFS_PROP_ZONED)) | |
1264 | break; | |
a10d50f9 SR |
1265 | zfs_dispatch_mount(hdl, handles, num_handles, i, func, data, |
1266 | tp); | |
34dc7c2f BB |
1267 | } |
1268 | ||
a10d50f9 SR |
1269 | tpool_wait(tp); /* wait for all scheduled mounts to complete */ |
1270 | tpool_destroy(tp); | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Mount and share all datasets within the given pool. This assumes that no | |
1275 | * datasets within the pool are currently mounted. | |
1276 | */ | |
a10d50f9 SR |
1277 | int |
1278 | zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags) | |
1279 | { | |
1280 | get_all_cb_t cb = { 0 }; | |
1281 | mount_state_t ms = { 0 }; | |
1282 | zfs_handle_t *zfsp; | |
1283 | int ret = 0; | |
1284 | ||
1285 | if ((zfsp = zfs_open(zhp->zpool_hdl, zhp->zpool_name, | |
1286 | ZFS_TYPE_DATASET)) == NULL) | |
1287 | goto out; | |
1288 | ||
1289 | /* | |
1290 | * Gather all non-snapshot datasets within the pool. Start by adding | |
1291 | * the root filesystem for this pool to the list, and then iterate | |
1292 | * over all child filesystems. | |
1293 | */ | |
1294 | libzfs_add_handle(&cb, zfsp); | |
399b9819 | 1295 | if (zfs_iter_filesystems(zfsp, zfs_iter_cb, &cb) != 0) |
a10d50f9 SR |
1296 | goto out; |
1297 | ||
1298 | /* | |
1299 | * Mount all filesystems | |
1300 | */ | |
1301 | ms.ms_mntopts = mntopts; | |
1302 | ms.ms_mntflags = flags; | |
1303 | zfs_foreach_mountpoint(zhp->zpool_hdl, cb.cb_handles, cb.cb_used, | |
1304 | zfs_mount_one, &ms, B_TRUE); | |
1305 | if (ms.ms_mntstatus != 0) | |
1306 | ret = ms.ms_mntstatus; | |
1307 | ||
1308 | /* | |
1309 | * Share all filesystems that need to be shared. This needs to be | |
1310 | * a separate pass because libshare is not mt-safe, and so we need | |
1311 | * to share serially. | |
1312 | */ | |
1313 | ms.ms_mntstatus = 0; | |
1314 | zfs_foreach_mountpoint(zhp->zpool_hdl, cb.cb_handles, cb.cb_used, | |
1315 | zfs_share_one, &ms, B_FALSE); | |
1316 | if (ms.ms_mntstatus != 0) | |
1317 | ret = ms.ms_mntstatus; | |
c15d36c6 | 1318 | else |
b4d9a82f | 1319 | zfs_commit_shares(NULL); |
34dc7c2f BB |
1320 | |
1321 | out: | |
a10d50f9 | 1322 | for (int i = 0; i < cb.cb_used; i++) |
572e2857 BB |
1323 | zfs_close(cb.cb_handles[i]); |
1324 | free(cb.cb_handles); | |
34dc7c2f BB |
1325 | |
1326 | return (ret); | |
1327 | } | |
1328 | ||
41eba770 JL |
1329 | struct sets_s { |
1330 | char *mountpoint; | |
1331 | zfs_handle_t *dataset; | |
1332 | }; | |
1333 | ||
34dc7c2f BB |
1334 | static int |
1335 | mountpoint_compare(const void *a, const void *b) | |
1336 | { | |
41eba770 JL |
1337 | const struct sets_s *mounta = (struct sets_s *)a; |
1338 | const struct sets_s *mountb = (struct sets_s *)b; | |
34dc7c2f | 1339 | |
41eba770 | 1340 | return (strcmp(mountb->mountpoint, mounta->mountpoint)); |
34dc7c2f BB |
1341 | } |
1342 | ||
1343 | /* | |
1344 | * Unshare and unmount all datasets within the given pool. We don't want to | |
1345 | * rely on traversing the DSL to discover the filesystems within the pool, | |
1346 | * because this may be expensive (if not all of them are mounted), and can fail | |
79251738 | 1347 | * arbitrarily (on I/O error, for example). Instead, we walk /proc/self/mounts |
1348 | * and gather all the filesystems that are currently mounted. | |
34dc7c2f | 1349 | */ |
34dc7c2f BB |
1350 | int |
1351 | zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force) | |
1352 | { | |
1353 | int used, alloc; | |
53352772 | 1354 | FILE *mnttab; |
34dc7c2f BB |
1355 | struct mnttab entry; |
1356 | size_t namelen; | |
41eba770 | 1357 | struct sets_s *sets = NULL; |
34dc7c2f BB |
1358 | libzfs_handle_t *hdl = zhp->zpool_hdl; |
1359 | int i; | |
1360 | int ret = -1; | |
1361 | int flags = (force ? MS_FORCE : 0); | |
1362 | ||
34dc7c2f BB |
1363 | namelen = strlen(zhp->zpool_name); |
1364 | ||
53352772 | 1365 | if ((mnttab = fopen(MNTTAB, "re")) == NULL) |
cbca6076 JL |
1366 | return (ENOENT); |
1367 | ||
34dc7c2f | 1368 | used = alloc = 0; |
53352772 | 1369 | while (getmntent(mnttab, &entry) == 0) { |
34dc7c2f BB |
1370 | /* |
1371 | * Ignore non-ZFS entries. | |
1372 | */ | |
1373 | if (entry.mnt_fstype == NULL || | |
1374 | strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) | |
1375 | continue; | |
1376 | ||
1377 | /* | |
1378 | * Ignore filesystems not within this pool. | |
1379 | */ | |
1380 | if (entry.mnt_mountp == NULL || | |
1381 | strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 || | |
1382 | (entry.mnt_special[namelen] != '/' && | |
1383 | entry.mnt_special[namelen] != '\0')) | |
1384 | continue; | |
1385 | ||
1386 | /* | |
1387 | * At this point we've found a filesystem within our pool. Add | |
1388 | * it to our growing list. | |
1389 | */ | |
1390 | if (used == alloc) { | |
1391 | if (alloc == 0) { | |
18dbf5c8 AZ |
1392 | sets = zfs_alloc(hdl, |
1393 | 8 * sizeof (struct sets_s)); | |
34dc7c2f BB |
1394 | alloc = 8; |
1395 | } else { | |
18dbf5c8 | 1396 | sets = zfs_realloc(hdl, sets, |
41eba770 | 1397 | alloc * sizeof (struct sets_s), |
18dbf5c8 | 1398 | alloc * 2 * sizeof (struct sets_s)); |
34dc7c2f BB |
1399 | |
1400 | alloc *= 2; | |
1401 | } | |
1402 | } | |
1403 | ||
18dbf5c8 | 1404 | sets[used].mountpoint = zfs_strdup(hdl, entry.mnt_mountp); |
34dc7c2f BB |
1405 | |
1406 | /* | |
1407 | * This is allowed to fail, in case there is some I/O error. It | |
1408 | * is only used to determine if we need to remove the underlying | |
1409 | * mountpoint, so failure is not fatal. | |
1410 | */ | |
41eba770 JL |
1411 | sets[used].dataset = make_dataset_handle(hdl, |
1412 | entry.mnt_special); | |
34dc7c2f BB |
1413 | |
1414 | used++; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * At this point, we have the entire list of filesystems, so sort it by | |
1419 | * mountpoint. | |
1420 | */ | |
63652e15 DS |
1421 | if (used != 0) |
1422 | qsort(sets, used, sizeof (struct sets_s), mountpoint_compare); | |
34dc7c2f BB |
1423 | |
1424 | /* | |
1425 | * Walk through and first unshare everything. | |
1426 | */ | |
1427 | for (i = 0; i < used; i++) { | |
471e9a10 | 1428 | for (enum sa_protocol i = 0; i < SA_PROTOCOL_COUNT; ++i) { |
b4d9a82f | 1429 | if (sa_is_shared(sets[i].mountpoint, i) && |
41eba770 | 1430 | unshare_one(hdl, sets[i].mountpoint, |
471e9a10 | 1431 | sets[i].mountpoint, i) != 0) |
34dc7c2f BB |
1432 | goto out; |
1433 | } | |
1434 | } | |
b4d9a82f | 1435 | zfs_commit_shares(NULL); |
34dc7c2f BB |
1436 | |
1437 | /* | |
1438 | * Now unmount everything, removing the underlying directories as | |
1439 | * appropriate. | |
1440 | */ | |
1441 | for (i = 0; i < used; i++) { | |
41eba770 JL |
1442 | if (unmount_one(sets[i].dataset, sets[i].mountpoint, |
1443 | flags) != 0) | |
34dc7c2f BB |
1444 | goto out; |
1445 | } | |
1446 | ||
1447 | for (i = 0; i < used; i++) { | |
41eba770 JL |
1448 | if (sets[i].dataset) |
1449 | remove_mountpoint(sets[i].dataset); | |
34dc7c2f BB |
1450 | } |
1451 | ||
3e8d5e4f JL |
1452 | zpool_disable_datasets_os(zhp, force); |
1453 | ||
34dc7c2f BB |
1454 | ret = 0; |
1455 | out: | |
53352772 | 1456 | (void) fclose(mnttab); |
34dc7c2f | 1457 | for (i = 0; i < used; i++) { |
41eba770 JL |
1458 | if (sets[i].dataset) |
1459 | zfs_close(sets[i].dataset); | |
1460 | free(sets[i].mountpoint); | |
34dc7c2f | 1461 | } |
41eba770 | 1462 | free(sets); |
34dc7c2f BB |
1463 | |
1464 | return (ret); | |
1465 | } |