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9f0a21e6 MM |
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 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>. | |
24 | * All rights reserved. | |
25 | * Copyright (c) 2012, 2015 by Delphix. All rights reserved. | |
26 | * Copyright (c) 2014 Integros [integros.com] | |
27 | * Copyright 2016 Nexenta Systems, Inc. All rights reserved. | |
28 | */ | |
29 | ||
30 | /* Portions Copyright 2010 Robert Milkowski */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <sys/param.h> | |
34 | #include <sys/systm.h> | |
35 | #include <sys/kernel.h> | |
36 | #include <sys/sysmacros.h> | |
37 | #include <sys/kmem.h> | |
38 | #include <sys/acl.h> | |
39 | #include <sys/vnode.h> | |
40 | #include <sys/vfs.h> | |
41 | #include <sys/mntent.h> | |
42 | #include <sys/mount.h> | |
43 | #include <sys/cmn_err.h> | |
44 | #include <sys/zfs_znode.h> | |
45 | #include <sys/zfs_dir.h> | |
46 | #include <sys/zil.h> | |
47 | #include <sys/fs/zfs.h> | |
48 | #include <sys/dmu.h> | |
49 | #include <sys/dsl_prop.h> | |
50 | #include <sys/dsl_dataset.h> | |
51 | #include <sys/dsl_deleg.h> | |
52 | #include <sys/spa.h> | |
53 | #include <sys/zap.h> | |
54 | #include <sys/sa.h> | |
55 | #include <sys/sa_impl.h> | |
56 | #include <sys/policy.h> | |
57 | #include <sys/atomic.h> | |
58 | #include <sys/zfs_ioctl.h> | |
59 | #include <sys/zfs_ctldir.h> | |
60 | #include <sys/zfs_fuid.h> | |
61 | #include <sys/sunddi.h> | |
62 | #include <sys/dmu_objset.h> | |
63 | #include <sys/dsl_dir.h> | |
64 | #include <sys/spa_boot.h> | |
65 | #include <sys/jail.h> | |
66 | #include <ufs/ufs/quota.h> | |
67 | #include <sys/zfs_quota.h> | |
68 | ||
69 | #include "zfs_comutil.h" | |
70 | ||
71 | #ifndef MNTK_VMSETSIZE_BUG | |
72 | #define MNTK_VMSETSIZE_BUG 0 | |
73 | #endif | |
74 | #ifndef MNTK_NOMSYNC | |
75 | #define MNTK_NOMSYNC 8 | |
76 | #endif | |
77 | ||
78 | /* BEGIN CSTYLED */ | |
79 | struct mtx zfs_debug_mtx; | |
80 | MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF); | |
81 | ||
82 | SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system"); | |
83 | ||
84 | int zfs_super_owner; | |
85 | SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0, | |
86 | "File system owner can perform privileged operation on his file systems"); | |
87 | ||
88 | int zfs_debug_level; | |
89 | SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RWTUN, &zfs_debug_level, 0, | |
90 | "Debug level"); | |
91 | ||
92 | SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions"); | |
93 | static int zfs_version_acl = ZFS_ACL_VERSION; | |
94 | SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0, | |
95 | "ZFS_ACL_VERSION"); | |
96 | static int zfs_version_spa = SPA_VERSION; | |
97 | SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0, | |
98 | "SPA_VERSION"); | |
99 | static int zfs_version_zpl = ZPL_VERSION; | |
100 | SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, | |
101 | "ZPL_VERSION"); | |
102 | /* END CSTYLED */ | |
103 | ||
104 | static int zfs_quotactl(vfs_t *vfsp, int cmds, uid_t id, void *arg); | |
105 | static int zfs_mount(vfs_t *vfsp); | |
106 | static int zfs_umount(vfs_t *vfsp, int fflag); | |
107 | static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp); | |
108 | static int zfs_statfs(vfs_t *vfsp, struct statfs *statp); | |
109 | static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp); | |
110 | static int zfs_sync(vfs_t *vfsp, int waitfor); | |
2e6af52b RM |
111 | #if __FreeBSD_version >= 1300098 |
112 | static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, uint64_t *extflagsp, | |
113 | struct ucred **credanonp, int *numsecflavors, int *secflavors); | |
114 | #else | |
9f0a21e6 MM |
115 | static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, |
116 | struct ucred **credanonp, int *numsecflavors, int **secflavors); | |
2e6af52b | 117 | #endif |
9f0a21e6 MM |
118 | static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp); |
119 | static void zfs_freevfs(vfs_t *vfsp); | |
120 | ||
121 | struct vfsops zfs_vfsops = { | |
122 | .vfs_mount = zfs_mount, | |
123 | .vfs_unmount = zfs_umount, | |
124 | #if __FreeBSD_version >= 1300049 | |
125 | .vfs_root = vfs_cache_root, | |
126 | .vfs_cachedroot = zfs_root, | |
127 | #else | |
128 | .vfs_root = zfs_root, | |
129 | #endif | |
130 | .vfs_statfs = zfs_statfs, | |
131 | .vfs_vget = zfs_vget, | |
132 | .vfs_sync = zfs_sync, | |
133 | .vfs_checkexp = zfs_checkexp, | |
134 | .vfs_fhtovp = zfs_fhtovp, | |
135 | .vfs_quotactl = zfs_quotactl, | |
136 | }; | |
137 | ||
138 | VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN); | |
139 | ||
140 | /* | |
141 | * We need to keep a count of active fs's. | |
142 | * This is necessary to prevent our module | |
143 | * from being unloaded after a umount -f | |
144 | */ | |
145 | static uint32_t zfs_active_fs_count = 0; | |
146 | ||
147 | int | |
148 | zfs_get_temporary_prop(dsl_dataset_t *ds, zfs_prop_t zfs_prop, uint64_t *val, | |
149 | char *setpoint) | |
150 | { | |
151 | int error; | |
152 | zfsvfs_t *zfvp; | |
153 | vfs_t *vfsp; | |
154 | objset_t *os; | |
155 | uint64_t tmp = *val; | |
156 | ||
157 | error = dmu_objset_from_ds(ds, &os); | |
158 | if (error != 0) | |
159 | return (error); | |
160 | ||
161 | error = getzfsvfs_impl(os, &zfvp); | |
162 | if (error != 0) | |
163 | return (error); | |
164 | if (zfvp == NULL) | |
165 | return (ENOENT); | |
166 | vfsp = zfvp->z_vfs; | |
167 | switch (zfs_prop) { | |
168 | case ZFS_PROP_ATIME: | |
169 | if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) | |
170 | tmp = 0; | |
171 | if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) | |
172 | tmp = 1; | |
173 | break; | |
174 | case ZFS_PROP_DEVICES: | |
175 | if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) | |
176 | tmp = 0; | |
177 | if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL)) | |
178 | tmp = 1; | |
179 | break; | |
180 | case ZFS_PROP_EXEC: | |
181 | if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) | |
182 | tmp = 0; | |
183 | if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) | |
184 | tmp = 1; | |
185 | break; | |
186 | case ZFS_PROP_SETUID: | |
187 | if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) | |
188 | tmp = 0; | |
189 | if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) | |
190 | tmp = 1; | |
191 | break; | |
192 | case ZFS_PROP_READONLY: | |
193 | if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) | |
194 | tmp = 0; | |
195 | if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) | |
196 | tmp = 1; | |
197 | break; | |
198 | case ZFS_PROP_XATTR: | |
199 | if (zfvp->z_flags & ZSB_XATTR) | |
200 | tmp = zfvp->z_xattr; | |
201 | break; | |
202 | case ZFS_PROP_NBMAND: | |
203 | if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) | |
204 | tmp = 0; | |
205 | if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) | |
206 | tmp = 1; | |
207 | break; | |
208 | default: | |
209 | vfs_unbusy(vfsp); | |
210 | return (ENOENT); | |
211 | } | |
212 | ||
213 | vfs_unbusy(vfsp); | |
214 | if (tmp != *val) { | |
215 | (void) strcpy(setpoint, "temporary"); | |
216 | *val = tmp; | |
217 | } | |
218 | return (0); | |
219 | } | |
220 | ||
221 | static int | |
222 | zfs_getquota(zfsvfs_t *zfsvfs, uid_t id, int isgroup, struct dqblk64 *dqp) | |
223 | { | |
224 | int error = 0; | |
225 | char buf[32]; | |
226 | uint64_t usedobj, quotaobj; | |
227 | uint64_t quota, used = 0; | |
228 | timespec_t now; | |
229 | ||
230 | usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; | |
231 | quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; | |
232 | ||
233 | if (quotaobj == 0 || zfsvfs->z_replay) { | |
234 | error = ENOENT; | |
235 | goto done; | |
236 | } | |
237 | (void) sprintf(buf, "%llx", (longlong_t)id); | |
238 | if ((error = zap_lookup(zfsvfs->z_os, quotaobj, | |
239 | buf, sizeof (quota), 1, "a)) != 0) { | |
240 | dprintf("%s(%d): quotaobj lookup failed\n", | |
241 | __FUNCTION__, __LINE__); | |
242 | goto done; | |
243 | } | |
244 | /* | |
245 | * quota(8) uses bsoftlimit as "quoota", and hardlimit as "limit". | |
246 | * So we set them to be the same. | |
247 | */ | |
248 | dqp->dqb_bsoftlimit = dqp->dqb_bhardlimit = btodb(quota); | |
249 | error = zap_lookup(zfsvfs->z_os, usedobj, buf, sizeof (used), 1, &used); | |
250 | if (error && error != ENOENT) { | |
251 | dprintf("%s(%d): usedobj failed; %d\n", | |
252 | __FUNCTION__, __LINE__, error); | |
253 | goto done; | |
254 | } | |
255 | dqp->dqb_curblocks = btodb(used); | |
256 | dqp->dqb_ihardlimit = dqp->dqb_isoftlimit = 0; | |
257 | vfs_timestamp(&now); | |
258 | /* | |
259 | * Setting this to 0 causes FreeBSD quota(8) to print | |
260 | * the number of days since the epoch, which isn't | |
261 | * particularly useful. | |
262 | */ | |
263 | dqp->dqb_btime = dqp->dqb_itime = now.tv_sec; | |
264 | done: | |
265 | return (error); | |
266 | } | |
267 | ||
268 | static int | |
269 | zfs_quotactl(vfs_t *vfsp, int cmds, uid_t id, void *arg) | |
270 | { | |
271 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
272 | struct thread *td; | |
273 | int cmd, type, error = 0; | |
274 | int bitsize; | |
275 | zfs_userquota_prop_t quota_type; | |
276 | struct dqblk64 dqblk = { 0 }; | |
277 | ||
278 | td = curthread; | |
279 | cmd = cmds >> SUBCMDSHIFT; | |
280 | type = cmds & SUBCMDMASK; | |
281 | ||
282 | ZFS_ENTER(zfsvfs); | |
283 | if (id == -1) { | |
284 | switch (type) { | |
285 | case USRQUOTA: | |
286 | id = td->td_ucred->cr_ruid; | |
287 | break; | |
288 | case GRPQUOTA: | |
289 | id = td->td_ucred->cr_rgid; | |
290 | break; | |
291 | default: | |
292 | error = EINVAL; | |
293 | if (cmd == Q_QUOTAON || cmd == Q_QUOTAOFF) | |
294 | vfs_unbusy(vfsp); | |
295 | goto done; | |
296 | } | |
297 | } | |
298 | /* | |
299 | * Map BSD type to: | |
300 | * ZFS_PROP_USERUSED, | |
301 | * ZFS_PROP_USERQUOTA, | |
302 | * ZFS_PROP_GROUPUSED, | |
303 | * ZFS_PROP_GROUPQUOTA | |
304 | */ | |
305 | switch (cmd) { | |
306 | case Q_SETQUOTA: | |
307 | case Q_SETQUOTA32: | |
308 | if (type == USRQUOTA) | |
309 | quota_type = ZFS_PROP_USERQUOTA; | |
310 | else if (type == GRPQUOTA) | |
311 | quota_type = ZFS_PROP_GROUPQUOTA; | |
312 | else | |
313 | error = EINVAL; | |
314 | break; | |
315 | case Q_GETQUOTA: | |
316 | case Q_GETQUOTA32: | |
317 | if (type == USRQUOTA) | |
318 | quota_type = ZFS_PROP_USERUSED; | |
319 | else if (type == GRPQUOTA) | |
320 | quota_type = ZFS_PROP_GROUPUSED; | |
321 | else | |
322 | error = EINVAL; | |
323 | break; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Depending on the cmd, we may need to get | |
328 | * the ruid and domain (see fuidstr_to_sid?), | |
329 | * the fuid (how?), or other information. | |
330 | * Create fuid using zfs_fuid_create(zfsvfs, id, | |
331 | * ZFS_OWNER or ZFS_GROUP, cr, &fuidp)? | |
332 | * I think I can use just the id? | |
333 | * | |
334 | * Look at zfs_id_overquota() to look up a quota. | |
335 | * zap_lookup(something, quotaobj, fuidstring, | |
336 | * sizeof (long long), 1, "a) | |
337 | * | |
338 | * See zfs_set_userquota() to set a quota. | |
339 | */ | |
340 | if ((uint32_t)type >= MAXQUOTAS) { | |
341 | error = EINVAL; | |
342 | goto done; | |
343 | } | |
344 | ||
345 | switch (cmd) { | |
346 | case Q_GETQUOTASIZE: | |
347 | bitsize = 64; | |
348 | error = copyout(&bitsize, arg, sizeof (int)); | |
349 | break; | |
350 | case Q_QUOTAON: | |
351 | // As far as I can tell, you can't turn quotas on or off on zfs | |
352 | error = 0; | |
353 | vfs_unbusy(vfsp); | |
354 | break; | |
355 | case Q_QUOTAOFF: | |
356 | error = ENOTSUP; | |
357 | vfs_unbusy(vfsp); | |
358 | break; | |
359 | case Q_SETQUOTA: | |
7b0e3903 | 360 | error = copyin(arg, &dqblk, sizeof (dqblk)); |
9f0a21e6 MM |
361 | if (error == 0) |
362 | error = zfs_set_userquota(zfsvfs, quota_type, | |
363 | "", id, dbtob(dqblk.dqb_bhardlimit)); | |
364 | break; | |
365 | case Q_GETQUOTA: | |
366 | error = zfs_getquota(zfsvfs, id, type == GRPQUOTA, &dqblk); | |
367 | if (error == 0) | |
368 | error = copyout(&dqblk, arg, sizeof (dqblk)); | |
369 | break; | |
370 | default: | |
371 | error = EINVAL; | |
372 | break; | |
373 | } | |
374 | done: | |
375 | ZFS_EXIT(zfsvfs); | |
376 | return (error); | |
377 | } | |
378 | ||
379 | ||
380 | boolean_t | |
381 | zfs_is_readonly(zfsvfs_t *zfsvfs) | |
382 | { | |
383 | return (!!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)); | |
384 | } | |
385 | ||
386 | /*ARGSUSED*/ | |
387 | static int | |
388 | zfs_sync(vfs_t *vfsp, int waitfor) | |
389 | { | |
390 | ||
391 | /* | |
392 | * Data integrity is job one. We don't want a compromised kernel | |
393 | * writing to the storage pool, so we never sync during panic. | |
394 | */ | |
395 | if (panicstr) | |
396 | return (0); | |
397 | ||
398 | /* | |
399 | * Ignore the system syncher. ZFS already commits async data | |
400 | * at zfs_txg_timeout intervals. | |
401 | */ | |
402 | if (waitfor == MNT_LAZY) | |
403 | return (0); | |
404 | ||
405 | if (vfsp != NULL) { | |
406 | /* | |
407 | * Sync a specific filesystem. | |
408 | */ | |
409 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
410 | dsl_pool_t *dp; | |
411 | int error; | |
412 | ||
413 | error = vfs_stdsync(vfsp, waitfor); | |
414 | if (error != 0) | |
415 | return (error); | |
416 | ||
417 | ZFS_ENTER(zfsvfs); | |
418 | dp = dmu_objset_pool(zfsvfs->z_os); | |
419 | ||
420 | /* | |
421 | * If the system is shutting down, then skip any | |
422 | * filesystems which may exist on a suspended pool. | |
423 | */ | |
424 | if (rebooting && spa_suspended(dp->dp_spa)) { | |
425 | ZFS_EXIT(zfsvfs); | |
426 | return (0); | |
427 | } | |
428 | ||
429 | if (zfsvfs->z_log != NULL) | |
430 | zil_commit(zfsvfs->z_log, 0); | |
431 | ||
432 | ZFS_EXIT(zfsvfs); | |
433 | } else { | |
434 | /* | |
435 | * Sync all ZFS filesystems. This is what happens when you | |
436 | * run sync(1M). Unlike other filesystems, ZFS honors the | |
437 | * request by waiting for all pools to commit all dirty data. | |
438 | */ | |
439 | spa_sync_allpools(); | |
440 | } | |
441 | ||
442 | return (0); | |
443 | } | |
444 | ||
445 | static void | |
446 | atime_changed_cb(void *arg, uint64_t newval) | |
447 | { | |
448 | zfsvfs_t *zfsvfs = arg; | |
449 | ||
450 | if (newval == TRUE) { | |
451 | zfsvfs->z_atime = TRUE; | |
452 | zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME; | |
453 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); | |
454 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); | |
455 | } else { | |
456 | zfsvfs->z_atime = FALSE; | |
457 | zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME; | |
458 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); | |
459 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); | |
460 | } | |
461 | } | |
462 | ||
463 | static void | |
464 | xattr_changed_cb(void *arg, uint64_t newval) | |
465 | { | |
466 | zfsvfs_t *zfsvfs = arg; | |
467 | ||
468 | if (newval == ZFS_XATTR_OFF) { | |
469 | zfsvfs->z_flags &= ~ZSB_XATTR; | |
470 | } else { | |
471 | zfsvfs->z_flags |= ZSB_XATTR; | |
472 | ||
473 | if (newval == ZFS_XATTR_SA) | |
474 | zfsvfs->z_xattr_sa = B_TRUE; | |
475 | else | |
476 | zfsvfs->z_xattr_sa = B_FALSE; | |
477 | } | |
478 | } | |
479 | ||
480 | static void | |
481 | blksz_changed_cb(void *arg, uint64_t newval) | |
482 | { | |
483 | zfsvfs_t *zfsvfs = arg; | |
484 | ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os))); | |
485 | ASSERT3U(newval, >=, SPA_MINBLOCKSIZE); | |
486 | ASSERT(ISP2(newval)); | |
487 | ||
488 | zfsvfs->z_max_blksz = newval; | |
489 | zfsvfs->z_vfs->mnt_stat.f_iosize = newval; | |
490 | } | |
491 | ||
492 | static void | |
493 | readonly_changed_cb(void *arg, uint64_t newval) | |
494 | { | |
495 | zfsvfs_t *zfsvfs = arg; | |
496 | ||
497 | if (newval) { | |
498 | /* XXX locking on vfs_flag? */ | |
499 | zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; | |
500 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); | |
501 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); | |
502 | } else { | |
503 | /* XXX locking on vfs_flag? */ | |
504 | zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; | |
505 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); | |
506 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); | |
507 | } | |
508 | } | |
509 | ||
510 | static void | |
511 | setuid_changed_cb(void *arg, uint64_t newval) | |
512 | { | |
513 | zfsvfs_t *zfsvfs = arg; | |
514 | ||
515 | if (newval == FALSE) { | |
516 | zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; | |
517 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); | |
518 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); | |
519 | } else { | |
520 | zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; | |
521 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); | |
522 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); | |
523 | } | |
524 | } | |
525 | ||
526 | static void | |
527 | exec_changed_cb(void *arg, uint64_t newval) | |
528 | { | |
529 | zfsvfs_t *zfsvfs = arg; | |
530 | ||
531 | if (newval == FALSE) { | |
532 | zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; | |
533 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); | |
534 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); | |
535 | } else { | |
536 | zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; | |
537 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); | |
538 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); | |
539 | } | |
540 | } | |
541 | ||
542 | /* | |
543 | * The nbmand mount option can be changed at mount time. | |
544 | * We can't allow it to be toggled on live file systems or incorrect | |
545 | * behavior may be seen from cifs clients | |
546 | * | |
547 | * This property isn't registered via dsl_prop_register(), but this callback | |
548 | * will be called when a file system is first mounted | |
549 | */ | |
550 | static void | |
551 | nbmand_changed_cb(void *arg, uint64_t newval) | |
552 | { | |
553 | zfsvfs_t *zfsvfs = arg; | |
554 | if (newval == FALSE) { | |
555 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); | |
556 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); | |
557 | } else { | |
558 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); | |
559 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); | |
560 | } | |
561 | } | |
562 | ||
563 | static void | |
564 | snapdir_changed_cb(void *arg, uint64_t newval) | |
565 | { | |
566 | zfsvfs_t *zfsvfs = arg; | |
567 | ||
568 | zfsvfs->z_show_ctldir = newval; | |
569 | } | |
570 | ||
571 | static void | |
572 | vscan_changed_cb(void *arg, uint64_t newval) | |
573 | { | |
574 | zfsvfs_t *zfsvfs = arg; | |
575 | ||
576 | zfsvfs->z_vscan = newval; | |
577 | } | |
578 | ||
579 | static void | |
580 | acl_mode_changed_cb(void *arg, uint64_t newval) | |
581 | { | |
582 | zfsvfs_t *zfsvfs = arg; | |
583 | ||
584 | zfsvfs->z_acl_mode = newval; | |
585 | } | |
586 | ||
587 | static void | |
588 | acl_inherit_changed_cb(void *arg, uint64_t newval) | |
589 | { | |
590 | zfsvfs_t *zfsvfs = arg; | |
591 | ||
592 | zfsvfs->z_acl_inherit = newval; | |
593 | } | |
594 | ||
595 | static int | |
596 | zfs_register_callbacks(vfs_t *vfsp) | |
597 | { | |
598 | struct dsl_dataset *ds = NULL; | |
599 | objset_t *os = NULL; | |
600 | zfsvfs_t *zfsvfs = NULL; | |
601 | uint64_t nbmand; | |
602 | boolean_t readonly = B_FALSE; | |
603 | boolean_t do_readonly = B_FALSE; | |
604 | boolean_t setuid = B_FALSE; | |
605 | boolean_t do_setuid = B_FALSE; | |
606 | boolean_t exec = B_FALSE; | |
607 | boolean_t do_exec = B_FALSE; | |
608 | boolean_t xattr = B_FALSE; | |
609 | boolean_t atime = B_FALSE; | |
610 | boolean_t do_atime = B_FALSE; | |
611 | boolean_t do_xattr = B_FALSE; | |
612 | int error = 0; | |
613 | ||
614 | ASSERT(vfsp); | |
615 | zfsvfs = vfsp->vfs_data; | |
616 | ASSERT(zfsvfs); | |
617 | os = zfsvfs->z_os; | |
618 | ||
619 | /* | |
620 | * This function can be called for a snapshot when we update snapshot's | |
621 | * mount point, which isn't really supported. | |
622 | */ | |
623 | if (dmu_objset_is_snapshot(os)) | |
624 | return (EOPNOTSUPP); | |
625 | ||
626 | /* | |
627 | * The act of registering our callbacks will destroy any mount | |
628 | * options we may have. In order to enable temporary overrides | |
629 | * of mount options, we stash away the current values and | |
630 | * restore them after we register the callbacks. | |
631 | */ | |
632 | if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || | |
633 | !spa_writeable(dmu_objset_spa(os))) { | |
634 | readonly = B_TRUE; | |
635 | do_readonly = B_TRUE; | |
636 | } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { | |
637 | readonly = B_FALSE; | |
638 | do_readonly = B_TRUE; | |
639 | } | |
640 | if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { | |
641 | setuid = B_FALSE; | |
642 | do_setuid = B_TRUE; | |
643 | } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { | |
644 | setuid = B_TRUE; | |
645 | do_setuid = B_TRUE; | |
646 | } | |
647 | if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { | |
648 | exec = B_FALSE; | |
649 | do_exec = B_TRUE; | |
650 | } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { | |
651 | exec = B_TRUE; | |
652 | do_exec = B_TRUE; | |
653 | } | |
654 | if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { | |
655 | zfsvfs->z_xattr = xattr = ZFS_XATTR_OFF; | |
656 | do_xattr = B_TRUE; | |
657 | } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { | |
658 | zfsvfs->z_xattr = xattr = ZFS_XATTR_DIR; | |
659 | do_xattr = B_TRUE; | |
660 | } else if (vfs_optionisset(vfsp, MNTOPT_DIRXATTR, NULL)) { | |
661 | zfsvfs->z_xattr = xattr = ZFS_XATTR_DIR; | |
662 | do_xattr = B_TRUE; | |
663 | } else if (vfs_optionisset(vfsp, MNTOPT_SAXATTR, NULL)) { | |
664 | zfsvfs->z_xattr = xattr = ZFS_XATTR_SA; | |
665 | do_xattr = B_TRUE; | |
666 | } | |
667 | if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { | |
668 | atime = B_FALSE; | |
669 | do_atime = B_TRUE; | |
670 | } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { | |
671 | atime = B_TRUE; | |
672 | do_atime = B_TRUE; | |
673 | } | |
674 | ||
675 | /* | |
676 | * We need to enter pool configuration here, so that we can use | |
677 | * dsl_prop_get_int_ds() to handle the special nbmand property below. | |
678 | * dsl_prop_get_integer() can not be used, because it has to acquire | |
679 | * spa_namespace_lock and we can not do that because we already hold | |
680 | * z_teardown_lock. The problem is that spa_write_cachefile() is called | |
681 | * with spa_namespace_lock held and the function calls ZFS vnode | |
682 | * operations to write the cache file and thus z_teardown_lock is | |
683 | * acquired after spa_namespace_lock. | |
684 | */ | |
685 | ds = dmu_objset_ds(os); | |
686 | dsl_pool_config_enter(dmu_objset_pool(os), FTAG); | |
687 | ||
688 | /* | |
689 | * nbmand is a special property. It can only be changed at | |
690 | * mount time. | |
691 | * | |
692 | * This is weird, but it is documented to only be changeable | |
693 | * at mount time. | |
694 | */ | |
695 | if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { | |
696 | nbmand = B_FALSE; | |
697 | } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { | |
698 | nbmand = B_TRUE; | |
699 | } else if ((error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0)) { | |
700 | dsl_pool_config_exit(dmu_objset_pool(os), FTAG); | |
701 | return (error); | |
702 | } | |
703 | ||
704 | /* | |
705 | * Register property callbacks. | |
706 | * | |
707 | * It would probably be fine to just check for i/o error from | |
708 | * the first prop_register(), but I guess I like to go | |
709 | * overboard... | |
710 | */ | |
711 | error = dsl_prop_register(ds, | |
712 | zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); | |
713 | error = error ? error : dsl_prop_register(ds, | |
714 | zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); | |
715 | error = error ? error : dsl_prop_register(ds, | |
716 | zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); | |
717 | error = error ? error : dsl_prop_register(ds, | |
718 | zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); | |
719 | error = error ? error : dsl_prop_register(ds, | |
720 | zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); | |
721 | error = error ? error : dsl_prop_register(ds, | |
722 | zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); | |
723 | error = error ? error : dsl_prop_register(ds, | |
724 | zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); | |
725 | error = error ? error : dsl_prop_register(ds, | |
726 | zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); | |
727 | error = error ? error : dsl_prop_register(ds, | |
728 | zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, | |
729 | zfsvfs); | |
730 | error = error ? error : dsl_prop_register(ds, | |
731 | zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); | |
732 | dsl_pool_config_exit(dmu_objset_pool(os), FTAG); | |
733 | if (error) | |
734 | goto unregister; | |
735 | ||
736 | /* | |
737 | * Invoke our callbacks to restore temporary mount options. | |
738 | */ | |
739 | if (do_readonly) | |
740 | readonly_changed_cb(zfsvfs, readonly); | |
741 | if (do_setuid) | |
742 | setuid_changed_cb(zfsvfs, setuid); | |
743 | if (do_exec) | |
744 | exec_changed_cb(zfsvfs, exec); | |
745 | if (do_xattr) | |
746 | xattr_changed_cb(zfsvfs, xattr); | |
747 | if (do_atime) | |
748 | atime_changed_cb(zfsvfs, atime); | |
749 | ||
750 | nbmand_changed_cb(zfsvfs, nbmand); | |
751 | ||
752 | return (0); | |
753 | ||
754 | unregister: | |
755 | dsl_prop_unregister_all(ds, zfsvfs); | |
756 | return (error); | |
757 | } | |
758 | ||
759 | /* | |
760 | * Associate this zfsvfs with the given objset, which must be owned. | |
761 | * This will cache a bunch of on-disk state from the objset in the | |
762 | * zfsvfs. | |
763 | */ | |
764 | static int | |
765 | zfsvfs_init(zfsvfs_t *zfsvfs, objset_t *os) | |
766 | { | |
767 | int error; | |
768 | uint64_t val; | |
769 | ||
770 | zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; | |
771 | zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; | |
772 | zfsvfs->z_os = os; | |
773 | ||
774 | error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); | |
775 | if (error != 0) | |
776 | return (error); | |
777 | if (zfsvfs->z_version > | |
778 | zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { | |
779 | (void) printf("Can't mount a version %lld file system " | |
780 | "on a version %lld pool\n. Pool must be upgraded to mount " | |
781 | "this file system.", (u_longlong_t)zfsvfs->z_version, | |
782 | (u_longlong_t)spa_version(dmu_objset_spa(os))); | |
783 | return (SET_ERROR(ENOTSUP)); | |
784 | } | |
785 | error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val); | |
786 | if (error != 0) | |
787 | return (error); | |
788 | zfsvfs->z_norm = (int)val; | |
789 | ||
790 | error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val); | |
791 | if (error != 0) | |
792 | return (error); | |
793 | zfsvfs->z_utf8 = (val != 0); | |
794 | ||
795 | error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val); | |
796 | if (error != 0) | |
797 | return (error); | |
798 | zfsvfs->z_case = (uint_t)val; | |
799 | ||
800 | /* | |
801 | * Fold case on file systems that are always or sometimes case | |
802 | * insensitive. | |
803 | */ | |
804 | if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || | |
805 | zfsvfs->z_case == ZFS_CASE_MIXED) | |
806 | zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; | |
807 | ||
808 | zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); | |
809 | zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); | |
810 | ||
811 | uint64_t sa_obj = 0; | |
812 | if (zfsvfs->z_use_sa) { | |
813 | /* should either have both of these objects or none */ | |
814 | error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, | |
815 | &sa_obj); | |
816 | if (error != 0) | |
817 | return (error); | |
818 | } | |
819 | ||
820 | error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, | |
821 | &zfsvfs->z_attr_table); | |
822 | if (error != 0) | |
823 | return (error); | |
824 | ||
825 | if (zfsvfs->z_version >= ZPL_VERSION_SA) | |
826 | sa_register_update_callback(os, zfs_sa_upgrade); | |
827 | ||
828 | error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, | |
829 | &zfsvfs->z_root); | |
830 | if (error != 0) | |
831 | return (error); | |
832 | ASSERT(zfsvfs->z_root != 0); | |
833 | ||
834 | error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, | |
835 | &zfsvfs->z_unlinkedobj); | |
836 | if (error != 0) | |
837 | return (error); | |
838 | ||
839 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
840 | zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], | |
841 | 8, 1, &zfsvfs->z_userquota_obj); | |
842 | if (error == ENOENT) | |
843 | zfsvfs->z_userquota_obj = 0; | |
844 | else if (error != 0) | |
845 | return (error); | |
846 | ||
847 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
848 | zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], | |
849 | 8, 1, &zfsvfs->z_groupquota_obj); | |
850 | if (error == ENOENT) | |
851 | zfsvfs->z_groupquota_obj = 0; | |
852 | else if (error != 0) | |
853 | return (error); | |
854 | ||
855 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
856 | zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTQUOTA], | |
857 | 8, 1, &zfsvfs->z_projectquota_obj); | |
858 | if (error == ENOENT) | |
859 | zfsvfs->z_projectquota_obj = 0; | |
860 | else if (error != 0) | |
861 | return (error); | |
862 | ||
863 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
864 | zfs_userquota_prop_prefixes[ZFS_PROP_USEROBJQUOTA], | |
865 | 8, 1, &zfsvfs->z_userobjquota_obj); | |
866 | if (error == ENOENT) | |
867 | zfsvfs->z_userobjquota_obj = 0; | |
868 | else if (error != 0) | |
869 | return (error); | |
870 | ||
871 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
872 | zfs_userquota_prop_prefixes[ZFS_PROP_GROUPOBJQUOTA], | |
873 | 8, 1, &zfsvfs->z_groupobjquota_obj); | |
874 | if (error == ENOENT) | |
875 | zfsvfs->z_groupobjquota_obj = 0; | |
876 | else if (error != 0) | |
877 | return (error); | |
878 | ||
879 | error = zap_lookup(os, MASTER_NODE_OBJ, | |
880 | zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTOBJQUOTA], | |
881 | 8, 1, &zfsvfs->z_projectobjquota_obj); | |
882 | if (error == ENOENT) | |
883 | zfsvfs->z_projectobjquota_obj = 0; | |
884 | else if (error != 0) | |
885 | return (error); | |
886 | ||
887 | error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, | |
888 | &zfsvfs->z_fuid_obj); | |
889 | if (error == ENOENT) | |
890 | zfsvfs->z_fuid_obj = 0; | |
891 | else if (error != 0) | |
892 | return (error); | |
893 | ||
894 | error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, | |
895 | &zfsvfs->z_shares_dir); | |
896 | if (error == ENOENT) | |
897 | zfsvfs->z_shares_dir = 0; | |
898 | else if (error != 0) | |
899 | return (error); | |
900 | ||
901 | /* | |
902 | * Only use the name cache if we are looking for a | |
903 | * name on a file system that does not require normalization | |
904 | * or case folding. We can also look there if we happen to be | |
905 | * on a non-normalizing, mixed sensitivity file system IF we | |
906 | * are looking for the exact name (which is always the case on | |
907 | * FreeBSD). | |
908 | */ | |
909 | zfsvfs->z_use_namecache = !zfsvfs->z_norm || | |
910 | ((zfsvfs->z_case == ZFS_CASE_MIXED) && | |
911 | !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER)); | |
912 | ||
913 | return (0); | |
914 | } | |
915 | ||
916 | taskq_t *zfsvfs_taskq; | |
917 | ||
918 | static void | |
919 | zfsvfs_task_unlinked_drain(void *context, int pending __unused) | |
920 | { | |
921 | ||
922 | zfs_unlinked_drain((zfsvfs_t *)context); | |
923 | } | |
924 | ||
925 | int | |
926 | zfsvfs_create(const char *osname, boolean_t readonly, zfsvfs_t **zfvp) | |
927 | { | |
928 | objset_t *os; | |
929 | zfsvfs_t *zfsvfs; | |
930 | int error; | |
931 | boolean_t ro = (readonly || (strchr(osname, '@') != NULL)); | |
932 | ||
933 | /* | |
934 | * XXX: Fix struct statfs so this isn't necessary! | |
935 | * | |
936 | * The 'osname' is used as the filesystem's special node, which means | |
937 | * it must fit in statfs.f_mntfromname, or else it can't be | |
938 | * enumerated, so libzfs_mnttab_find() returns NULL, which causes | |
939 | * 'zfs unmount' to think it's not mounted when it is. | |
940 | */ | |
941 | if (strlen(osname) >= MNAMELEN) | |
942 | return (SET_ERROR(ENAMETOOLONG)); | |
943 | ||
944 | zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); | |
945 | ||
946 | error = dmu_objset_own(osname, DMU_OST_ZFS, ro, B_TRUE, zfsvfs, | |
947 | &os); | |
948 | if (error != 0) { | |
949 | kmem_free(zfsvfs, sizeof (zfsvfs_t)); | |
950 | return (error); | |
951 | } | |
952 | ||
953 | error = zfsvfs_create_impl(zfvp, zfsvfs, os); | |
954 | ||
955 | return (error); | |
956 | } | |
957 | ||
958 | ||
959 | int | |
960 | zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os) | |
961 | { | |
962 | int error; | |
963 | ||
964 | zfsvfs->z_vfs = NULL; | |
965 | zfsvfs->z_parent = zfsvfs; | |
966 | ||
967 | mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); | |
968 | mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); | |
969 | list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), | |
970 | offsetof(znode_t, z_link_node)); | |
971 | TASK_INIT(&zfsvfs->z_unlinked_drain_task, 0, | |
972 | zfsvfs_task_unlinked_drain, zfsvfs); | |
973 | #ifdef DIAGNOSTIC | |
974 | rrm_init(&zfsvfs->z_teardown_lock, B_TRUE); | |
975 | #else | |
976 | rrm_init(&zfsvfs->z_teardown_lock, B_FALSE); | |
977 | #endif | |
8e7fe49b | 978 | ZFS_INIT_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
979 | rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); |
980 | for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++) | |
981 | mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); | |
982 | ||
983 | error = zfsvfs_init(zfsvfs, os); | |
984 | if (error != 0) { | |
985 | dmu_objset_disown(os, B_TRUE, zfsvfs); | |
986 | *zfvp = NULL; | |
987 | kmem_free(zfsvfs, sizeof (zfsvfs_t)); | |
988 | return (error); | |
989 | } | |
990 | ||
991 | *zfvp = zfsvfs; | |
992 | return (0); | |
993 | } | |
994 | ||
995 | static int | |
996 | zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) | |
997 | { | |
998 | int error; | |
999 | ||
1000 | /* | |
1001 | * Check for a bad on-disk format version now since we | |
1002 | * lied about owning the dataset readonly before. | |
1003 | */ | |
1004 | if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && | |
1005 | dmu_objset_incompatible_encryption_version(zfsvfs->z_os)) | |
1006 | return (SET_ERROR(EROFS)); | |
1007 | ||
1008 | error = zfs_register_callbacks(zfsvfs->z_vfs); | |
1009 | if (error) | |
1010 | return (error); | |
1011 | ||
1012 | zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); | |
1013 | ||
1014 | /* | |
1015 | * If we are not mounting (ie: online recv), then we don't | |
1016 | * have to worry about replaying the log as we blocked all | |
1017 | * operations out since we closed the ZIL. | |
1018 | */ | |
1019 | if (mounting) { | |
1020 | boolean_t readonly; | |
1021 | ||
4547fc4e AJ |
1022 | ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL); |
1023 | dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os); | |
1024 | ||
9f0a21e6 MM |
1025 | /* |
1026 | * During replay we remove the read only flag to | |
1027 | * allow replays to succeed. | |
1028 | */ | |
1029 | readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; | |
1030 | if (readonly != 0) { | |
1031 | zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; | |
1032 | } else { | |
1033 | dsl_dir_t *dd; | |
4547fc4e AJ |
1034 | zap_stats_t zs; |
1035 | ||
1036 | if (zap_get_stats(zfsvfs->z_os, zfsvfs->z_unlinkedobj, | |
1037 | &zs) == 0) { | |
1038 | dataset_kstats_update_nunlinks_kstat( | |
1039 | &zfsvfs->z_kstat, zs.zs_num_entries); | |
1040 | dprintf_ds(zfsvfs->z_os->os_dsl_dataset, | |
1041 | "num_entries in unlinked set: %llu", | |
1042 | zs.zs_num_entries); | |
1043 | } | |
9f0a21e6 MM |
1044 | |
1045 | zfs_unlinked_drain(zfsvfs); | |
1046 | dd = zfsvfs->z_os->os_dsl_dataset->ds_dir; | |
1047 | dd->dd_activity_cancelled = B_FALSE; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Parse and replay the intent log. | |
1052 | * | |
1053 | * Because of ziltest, this must be done after | |
1054 | * zfs_unlinked_drain(). (Further note: ziltest | |
1055 | * doesn't use readonly mounts, where | |
1056 | * zfs_unlinked_drain() isn't called.) This is because | |
1057 | * ziltest causes spa_sync() to think it's committed, | |
1058 | * but actually it is not, so the intent log contains | |
1059 | * many txg's worth of changes. | |
1060 | * | |
1061 | * In particular, if object N is in the unlinked set in | |
1062 | * the last txg to actually sync, then it could be | |
1063 | * actually freed in a later txg and then reallocated | |
1064 | * in a yet later txg. This would write a "create | |
1065 | * object N" record to the intent log. Normally, this | |
1066 | * would be fine because the spa_sync() would have | |
1067 | * written out the fact that object N is free, before | |
1068 | * we could write the "create object N" intent log | |
1069 | * record. | |
1070 | * | |
1071 | * But when we are in ziltest mode, we advance the "open | |
1072 | * txg" without actually spa_sync()-ing the changes to | |
1073 | * disk. So we would see that object N is still | |
1074 | * allocated and in the unlinked set, and there is an | |
1075 | * intent log record saying to allocate it. | |
1076 | */ | |
1077 | if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { | |
1078 | if (zil_replay_disable) { | |
1079 | zil_destroy(zfsvfs->z_log, B_FALSE); | |
1080 | } else { | |
1081 | boolean_t use_nc = zfsvfs->z_use_namecache; | |
1082 | zfsvfs->z_use_namecache = B_FALSE; | |
1083 | zfsvfs->z_replay = B_TRUE; | |
1084 | zil_replay(zfsvfs->z_os, zfsvfs, | |
1085 | zfs_replay_vector); | |
1086 | zfsvfs->z_replay = B_FALSE; | |
1087 | zfsvfs->z_use_namecache = use_nc; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* restore readonly bit */ | |
1092 | if (readonly != 0) | |
1093 | zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * Set the objset user_ptr to track its zfsvfs. | |
1098 | */ | |
1099 | mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); | |
1100 | dmu_objset_set_user(zfsvfs->z_os, zfsvfs); | |
1101 | mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); | |
1102 | ||
1103 | return (0); | |
1104 | } | |
1105 | ||
1106 | extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ | |
1107 | ||
1108 | void | |
1109 | zfsvfs_free(zfsvfs_t *zfsvfs) | |
1110 | { | |
1111 | int i; | |
1112 | ||
1113 | /* | |
1114 | * This is a barrier to prevent the filesystem from going away in | |
1115 | * zfs_znode_move() until we can safely ensure that the filesystem is | |
1116 | * not unmounted. We consider the filesystem valid before the barrier | |
1117 | * and invalid after the barrier. | |
1118 | */ | |
1119 | rw_enter(&zfsvfs_lock, RW_READER); | |
1120 | rw_exit(&zfsvfs_lock); | |
1121 | ||
1122 | zfs_fuid_destroy(zfsvfs); | |
1123 | ||
1124 | mutex_destroy(&zfsvfs->z_znodes_lock); | |
1125 | mutex_destroy(&zfsvfs->z_lock); | |
1126 | ASSERT(zfsvfs->z_nr_znodes == 0); | |
1127 | list_destroy(&zfsvfs->z_all_znodes); | |
1128 | rrm_destroy(&zfsvfs->z_teardown_lock); | |
8e7fe49b | 1129 | ZFS_DESTROY_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
1130 | rw_destroy(&zfsvfs->z_fuid_lock); |
1131 | for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) | |
1132 | mutex_destroy(&zfsvfs->z_hold_mtx[i]); | |
4547fc4e | 1133 | dataset_kstats_destroy(&zfsvfs->z_kstat); |
9f0a21e6 MM |
1134 | kmem_free(zfsvfs, sizeof (zfsvfs_t)); |
1135 | } | |
1136 | ||
1137 | static void | |
1138 | zfs_set_fuid_feature(zfsvfs_t *zfsvfs) | |
1139 | { | |
1140 | zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); | |
1141 | if (zfsvfs->z_vfs) { | |
1142 | if (zfsvfs->z_use_fuids) { | |
1143 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); | |
1144 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); | |
1145 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); | |
1146 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); | |
1147 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); | |
1148 | vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); | |
1149 | } else { | |
1150 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); | |
1151 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); | |
1152 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); | |
1153 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); | |
1154 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); | |
1155 | vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); | |
1156 | } | |
1157 | } | |
1158 | zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); | |
1159 | } | |
1160 | ||
1161 | static int | |
1162 | zfs_domount(vfs_t *vfsp, char *osname) | |
1163 | { | |
1164 | uint64_t recordsize, fsid_guid; | |
1165 | int error = 0; | |
1166 | zfsvfs_t *zfsvfs; | |
1167 | ||
1168 | ASSERT(vfsp); | |
1169 | ASSERT(osname); | |
1170 | ||
1171 | error = zfsvfs_create(osname, vfsp->mnt_flag & MNT_RDONLY, &zfsvfs); | |
1172 | if (error) | |
1173 | return (error); | |
1174 | zfsvfs->z_vfs = vfsp; | |
1175 | ||
1176 | if ((error = dsl_prop_get_integer(osname, | |
1177 | "recordsize", &recordsize, NULL))) | |
1178 | goto out; | |
1179 | zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; | |
1180 | zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; | |
1181 | ||
1182 | vfsp->vfs_data = zfsvfs; | |
1183 | vfsp->mnt_flag |= MNT_LOCAL; | |
1184 | vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; | |
1185 | vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; | |
1186 | vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED; | |
1187 | /* | |
1188 | * This can cause a loss of coherence between ARC and page cache | |
1189 | * on ZoF - unclear if the problem is in FreeBSD or ZoF | |
1190 | */ | |
1191 | vfsp->mnt_kern_flag |= MNTK_NO_IOPF; /* vn_io_fault can be used */ | |
1192 | vfsp->mnt_kern_flag |= MNTK_NOMSYNC; | |
1193 | vfsp->mnt_kern_flag |= MNTK_VMSETSIZE_BUG; | |
1194 | ||
1b376d17 MM |
1195 | #if defined(_KERNEL) && !defined(KMEM_DEBUG) |
1196 | vfsp->mnt_kern_flag |= MNTK_FPLOOKUP; | |
1197 | #endif | |
9f0a21e6 MM |
1198 | /* |
1199 | * The fsid is 64 bits, composed of an 8-bit fs type, which | |
1200 | * separates our fsid from any other filesystem types, and a | |
1201 | * 56-bit objset unique ID. The objset unique ID is unique to | |
1202 | * all objsets open on this system, provided by unique_create(). | |
1203 | * The 8-bit fs type must be put in the low bits of fsid[1] | |
1204 | * because that's where other Solaris filesystems put it. | |
1205 | */ | |
1206 | fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); | |
1207 | ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); | |
1208 | vfsp->vfs_fsid.val[0] = fsid_guid; | |
1209 | vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | | |
1210 | (vfsp->mnt_vfc->vfc_typenum & 0xFF); | |
1211 | ||
1212 | /* | |
1213 | * Set features for file system. | |
1214 | */ | |
1215 | zfs_set_fuid_feature(zfsvfs); | |
1216 | if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { | |
1217 | vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); | |
1218 | vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); | |
1219 | vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); | |
1220 | } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { | |
1221 | vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); | |
1222 | vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); | |
1223 | } | |
1224 | vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); | |
1225 | ||
1226 | if (dmu_objset_is_snapshot(zfsvfs->z_os)) { | |
1227 | uint64_t pval; | |
1228 | ||
1229 | atime_changed_cb(zfsvfs, B_FALSE); | |
1230 | readonly_changed_cb(zfsvfs, B_TRUE); | |
1231 | if ((error = dsl_prop_get_integer(osname, | |
1232 | "xattr", &pval, NULL))) | |
1233 | goto out; | |
1234 | xattr_changed_cb(zfsvfs, pval); | |
1235 | zfsvfs->z_issnap = B_TRUE; | |
1236 | zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; | |
1237 | ||
1238 | mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); | |
1239 | dmu_objset_set_user(zfsvfs->z_os, zfsvfs); | |
1240 | mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); | |
1241 | } else { | |
1242 | if ((error = zfsvfs_setup(zfsvfs, B_TRUE))) | |
1243 | goto out; | |
1244 | } | |
1245 | ||
1246 | vfs_mountedfrom(vfsp, osname); | |
1247 | ||
1248 | if (!zfsvfs->z_issnap) | |
1249 | zfsctl_create(zfsvfs); | |
1250 | out: | |
1251 | if (error) { | |
1252 | dmu_objset_disown(zfsvfs->z_os, B_TRUE, zfsvfs); | |
1253 | zfsvfs_free(zfsvfs); | |
1254 | } else { | |
1255 | atomic_inc_32(&zfs_active_fs_count); | |
1256 | } | |
1257 | ||
1258 | return (error); | |
1259 | } | |
1260 | ||
65c7cc49 | 1261 | static void |
9f0a21e6 MM |
1262 | zfs_unregister_callbacks(zfsvfs_t *zfsvfs) |
1263 | { | |
1264 | objset_t *os = zfsvfs->z_os; | |
1265 | ||
1266 | if (!dmu_objset_is_snapshot(os)) | |
1267 | dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs); | |
1268 | } | |
1269 | ||
9f0a21e6 MM |
1270 | static int |
1271 | getpoolname(const char *osname, char *poolname) | |
1272 | { | |
1273 | char *p; | |
1274 | ||
1275 | p = strchr(osname, '/'); | |
1276 | if (p == NULL) { | |
1277 | if (strlen(osname) >= MAXNAMELEN) | |
1278 | return (ENAMETOOLONG); | |
1279 | (void) strcpy(poolname, osname); | |
1280 | } else { | |
1281 | if (p - osname >= MAXNAMELEN) | |
1282 | return (ENAMETOOLONG); | |
1283 | (void) strncpy(poolname, osname, p - osname); | |
1284 | poolname[p - osname] = '\0'; | |
1285 | } | |
1286 | return (0); | |
1287 | } | |
1288 | ||
1289 | /*ARGSUSED*/ | |
1290 | static int | |
1291 | zfs_mount(vfs_t *vfsp) | |
1292 | { | |
1293 | kthread_t *td = curthread; | |
1294 | vnode_t *mvp = vfsp->mnt_vnodecovered; | |
1295 | cred_t *cr = td->td_ucred; | |
1296 | char *osname; | |
1297 | int error = 0; | |
1298 | int canwrite; | |
1299 | ||
1300 | if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) | |
1301 | return (SET_ERROR(EINVAL)); | |
1302 | ||
1303 | /* | |
1304 | * If full-owner-access is enabled and delegated administration is | |
1305 | * turned on, we must set nosuid. | |
1306 | */ | |
1307 | if (zfs_super_owner && | |
1308 | dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { | |
1309 | secpolicy_fs_mount_clearopts(cr, vfsp); | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Check for mount privilege? | |
1314 | * | |
1315 | * If we don't have privilege then see if | |
1316 | * we have local permission to allow it | |
1317 | */ | |
1318 | error = secpolicy_fs_mount(cr, mvp, vfsp); | |
1319 | if (error) { | |
1320 | if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) | |
1321 | goto out; | |
1322 | ||
1323 | if (!(vfsp->vfs_flag & MS_REMOUNT)) { | |
1324 | vattr_t vattr; | |
1325 | ||
1326 | /* | |
1327 | * Make sure user is the owner of the mount point | |
1328 | * or has sufficient privileges. | |
1329 | */ | |
1330 | ||
1331 | vattr.va_mask = AT_UID; | |
1332 | ||
1333 | vn_lock(mvp, LK_SHARED | LK_RETRY); | |
1334 | if (VOP_GETATTR(mvp, &vattr, cr)) { | |
1335 | VOP_UNLOCK1(mvp); | |
1336 | goto out; | |
1337 | } | |
1338 | ||
1339 | if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && | |
1340 | VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { | |
1341 | VOP_UNLOCK1(mvp); | |
1342 | goto out; | |
1343 | } | |
1344 | VOP_UNLOCK1(mvp); | |
1345 | } | |
1346 | ||
1347 | secpolicy_fs_mount_clearopts(cr, vfsp); | |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * Refuse to mount a filesystem if we are in a local zone and the | |
1352 | * dataset is not visible. | |
1353 | */ | |
1354 | if (!INGLOBALZONE(curproc) && | |
1355 | (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { | |
1356 | error = SET_ERROR(EPERM); | |
1357 | goto out; | |
1358 | } | |
1359 | ||
9f0a21e6 MM |
1360 | vfsp->vfs_flag |= MNT_NFS4ACLS; |
1361 | ||
1362 | /* | |
1363 | * When doing a remount, we simply refresh our temporary properties | |
1364 | * according to those options set in the current VFS options. | |
1365 | */ | |
1366 | if (vfsp->vfs_flag & MS_REMOUNT) { | |
1367 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1368 | ||
1369 | /* | |
1370 | * Refresh mount options with z_teardown_lock blocking I/O while | |
1371 | * the filesystem is in an inconsistent state. | |
1372 | * The lock also serializes this code with filesystem | |
1373 | * manipulations between entry to zfs_suspend_fs() and return | |
1374 | * from zfs_resume_fs(). | |
1375 | */ | |
1376 | rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); | |
1377 | zfs_unregister_callbacks(zfsvfs); | |
1378 | error = zfs_register_callbacks(vfsp); | |
1379 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | /* Initial root mount: try hard to import the requested root pool. */ | |
1384 | if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 && | |
1385 | (vfsp->vfs_flag & MNT_UPDATE) == 0) { | |
1386 | char pname[MAXNAMELEN]; | |
1387 | ||
1388 | error = getpoolname(osname, pname); | |
1389 | if (error == 0) | |
f2c027bd | 1390 | error = spa_import_rootpool(pname, false); |
9f0a21e6 MM |
1391 | if (error) |
1392 | goto out; | |
1393 | } | |
1394 | DROP_GIANT(); | |
1395 | error = zfs_domount(vfsp, osname); | |
1396 | PICKUP_GIANT(); | |
1397 | ||
1398 | out: | |
1399 | return (error); | |
1400 | } | |
1401 | ||
1402 | static int | |
1403 | zfs_statfs(vfs_t *vfsp, struct statfs *statp) | |
1404 | { | |
1405 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1406 | uint64_t refdbytes, availbytes, usedobjs, availobjs; | |
1407 | ||
1408 | statp->f_version = STATFS_VERSION; | |
1409 | ||
1410 | ZFS_ENTER(zfsvfs); | |
1411 | ||
1412 | dmu_objset_space(zfsvfs->z_os, | |
1413 | &refdbytes, &availbytes, &usedobjs, &availobjs); | |
1414 | ||
1415 | /* | |
1416 | * The underlying storage pool actually uses multiple block sizes. | |
1417 | * We report the fragsize as the smallest block size we support, | |
1418 | * and we report our blocksize as the filesystem's maximum blocksize. | |
1419 | */ | |
1420 | statp->f_bsize = SPA_MINBLOCKSIZE; | |
1421 | statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; | |
1422 | ||
1423 | /* | |
1424 | * The following report "total" blocks of various kinds in the | |
1425 | * file system, but reported in terms of f_frsize - the | |
1426 | * "fragment" size. | |
1427 | */ | |
1428 | ||
1429 | statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; | |
1430 | statp->f_bfree = availbytes / statp->f_bsize; | |
1431 | statp->f_bavail = statp->f_bfree; /* no root reservation */ | |
1432 | ||
1433 | /* | |
1434 | * statvfs() should really be called statufs(), because it assumes | |
1435 | * static metadata. ZFS doesn't preallocate files, so the best | |
1436 | * we can do is report the max that could possibly fit in f_files, | |
1437 | * and that minus the number actually used in f_ffree. | |
1438 | * For f_ffree, report the smaller of the number of object available | |
1439 | * and the number of blocks (each object will take at least a block). | |
1440 | */ | |
1441 | statp->f_ffree = MIN(availobjs, statp->f_bfree); | |
1442 | statp->f_files = statp->f_ffree + usedobjs; | |
1443 | ||
1444 | /* | |
1445 | * We're a zfs filesystem. | |
1446 | */ | |
1447 | strlcpy(statp->f_fstypename, "zfs", | |
1448 | sizeof (statp->f_fstypename)); | |
1449 | ||
1450 | strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, | |
1451 | sizeof (statp->f_mntfromname)); | |
1452 | strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, | |
1453 | sizeof (statp->f_mntonname)); | |
1454 | ||
1455 | statp->f_namemax = MAXNAMELEN - 1; | |
1456 | ||
1457 | ZFS_EXIT(zfsvfs); | |
1458 | return (0); | |
1459 | } | |
1460 | ||
1461 | static int | |
1462 | zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) | |
1463 | { | |
1464 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1465 | znode_t *rootzp; | |
1466 | int error; | |
1467 | ||
1468 | ZFS_ENTER(zfsvfs); | |
1469 | ||
1470 | error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); | |
1471 | if (error == 0) | |
1472 | *vpp = ZTOV(rootzp); | |
1473 | ||
1474 | ZFS_EXIT(zfsvfs); | |
1475 | ||
1476 | if (error == 0) { | |
1477 | error = vn_lock(*vpp, flags); | |
1478 | if (error != 0) { | |
1479 | VN_RELE(*vpp); | |
1480 | *vpp = NULL; | |
1481 | } | |
1482 | } | |
1483 | return (error); | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Teardown the zfsvfs::z_os. | |
1488 | * | |
1489 | * Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock' | |
1490 | * and 'z_teardown_inactive_lock' held. | |
1491 | */ | |
1492 | static int | |
1493 | zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) | |
1494 | { | |
1495 | znode_t *zp; | |
1496 | dsl_dir_t *dd; | |
1497 | ||
1498 | /* | |
1499 | * If someone has not already unmounted this file system, | |
1500 | * drain the zrele_taskq to ensure all active references to the | |
1501 | * zfsvfs_t have been handled only then can it be safely destroyed. | |
1502 | */ | |
1503 | if (zfsvfs->z_os) { | |
1504 | /* | |
1505 | * If we're unmounting we have to wait for the list to | |
1506 | * drain completely. | |
1507 | * | |
1508 | * If we're not unmounting there's no guarantee the list | |
1509 | * will drain completely, but zreles run from the taskq | |
1510 | * may add the parents of dir-based xattrs to the taskq | |
1511 | * so we want to wait for these. | |
1512 | * | |
1513 | * We can safely read z_nr_znodes without locking because the | |
1514 | * VFS has already blocked operations which add to the | |
1515 | * z_all_znodes list and thus increment z_nr_znodes. | |
1516 | */ | |
1517 | int round = 0; | |
1518 | while (zfsvfs->z_nr_znodes > 0) { | |
1519 | taskq_wait_outstanding(dsl_pool_zrele_taskq( | |
1520 | dmu_objset_pool(zfsvfs->z_os)), 0); | |
1521 | if (++round > 1 && !unmounting) | |
1522 | break; | |
1523 | } | |
1524 | } | |
1525 | rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); | |
1526 | ||
1527 | if (!unmounting) { | |
1528 | /* | |
1529 | * We purge the parent filesystem's vfsp as the parent | |
1530 | * filesystem and all of its snapshots have their vnode's | |
1531 | * v_vfsp set to the parent's filesystem's vfsp. Note, | |
1532 | * 'z_parent' is self referential for non-snapshots. | |
1533 | */ | |
1534 | #ifdef FREEBSD_NAMECACHE | |
f6bb7c02 MG |
1535 | #if __FreeBSD_version >= 1300117 |
1536 | cache_purgevfs(zfsvfs->z_parent->z_vfs); | |
1537 | #else | |
9f0a21e6 | 1538 | cache_purgevfs(zfsvfs->z_parent->z_vfs, true); |
f6bb7c02 | 1539 | #endif |
9f0a21e6 MM |
1540 | #endif |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Close the zil. NB: Can't close the zil while zfs_inactive | |
1545 | * threads are blocked as zil_close can call zfs_inactive. | |
1546 | */ | |
1547 | if (zfsvfs->z_log) { | |
1548 | zil_close(zfsvfs->z_log); | |
1549 | zfsvfs->z_log = NULL; | |
1550 | } | |
1551 | ||
8e7fe49b | 1552 | ZFS_WLOCK_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
1553 | |
1554 | /* | |
1555 | * If we are not unmounting (ie: online recv) and someone already | |
1556 | * unmounted this file system while we were doing the switcheroo, | |
1557 | * or a reopen of z_os failed then just bail out now. | |
1558 | */ | |
1559 | if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { | |
8e7fe49b | 1560 | ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
1561 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); |
1562 | return (SET_ERROR(EIO)); | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * At this point there are no vops active, and any new vops will | |
1567 | * fail with EIO since we have z_teardown_lock for writer (only | |
dd4bc569 | 1568 | * relevant for forced unmount). |
9f0a21e6 MM |
1569 | * |
1570 | * Release all holds on dbufs. | |
1571 | */ | |
1572 | mutex_enter(&zfsvfs->z_znodes_lock); | |
1573 | for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; | |
1574 | zp = list_next(&zfsvfs->z_all_znodes, zp)) | |
1575 | if (zp->z_sa_hdl) { | |
1576 | ASSERT(ZTOV(zp)->v_count >= 0); | |
1577 | zfs_znode_dmu_fini(zp); | |
1578 | } | |
1579 | mutex_exit(&zfsvfs->z_znodes_lock); | |
1580 | ||
1581 | /* | |
1582 | * If we are unmounting, set the unmounted flag and let new vops | |
1583 | * unblock. zfs_inactive will have the unmounted behavior, and all | |
1584 | * other vops will fail with EIO. | |
1585 | */ | |
1586 | if (unmounting) { | |
1587 | zfsvfs->z_unmounted = B_TRUE; | |
8e7fe49b | 1588 | ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
1589 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * z_os will be NULL if there was an error in attempting to reopen | |
1594 | * zfsvfs, so just return as the properties had already been | |
1595 | * unregistered and cached data had been evicted before. | |
1596 | */ | |
1597 | if (zfsvfs->z_os == NULL) | |
1598 | return (0); | |
1599 | ||
1600 | /* | |
1601 | * Unregister properties. | |
1602 | */ | |
1603 | zfs_unregister_callbacks(zfsvfs); | |
1604 | ||
1605 | /* | |
1606 | * Evict cached data | |
1607 | */ | |
1608 | if (!zfs_is_readonly(zfsvfs)) | |
1609 | txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); | |
1610 | dmu_objset_evict_dbufs(zfsvfs->z_os); | |
1611 | dd = zfsvfs->z_os->os_dsl_dataset->ds_dir; | |
1612 | dsl_dir_cancel_waiters(dd); | |
1613 | ||
1614 | return (0); | |
1615 | } | |
1616 | ||
1617 | /*ARGSUSED*/ | |
1618 | static int | |
1619 | zfs_umount(vfs_t *vfsp, int fflag) | |
1620 | { | |
1621 | kthread_t *td = curthread; | |
1622 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1623 | objset_t *os; | |
1624 | cred_t *cr = td->td_ucred; | |
1625 | int ret; | |
1626 | ||
1627 | ret = secpolicy_fs_unmount(cr, vfsp); | |
1628 | if (ret) { | |
1629 | if (dsl_deleg_access((char *)vfsp->vfs_resource, | |
1630 | ZFS_DELEG_PERM_MOUNT, cr)) | |
1631 | return (ret); | |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | * Unmount any snapshots mounted under .zfs before unmounting the | |
1636 | * dataset itself. | |
1637 | */ | |
1638 | if (zfsvfs->z_ctldir != NULL) { | |
1639 | if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) | |
1640 | return (ret); | |
1641 | } | |
1642 | ||
1643 | if (fflag & MS_FORCE) { | |
1644 | /* | |
1645 | * Mark file system as unmounted before calling | |
1646 | * vflush(FORCECLOSE). This way we ensure no future vnops | |
1647 | * will be called and risk operating on DOOMED vnodes. | |
1648 | */ | |
1649 | rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); | |
1650 | zfsvfs->z_unmounted = B_TRUE; | |
1651 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * Flush all the files. | |
1656 | */ | |
1657 | ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td); | |
1658 | if (ret != 0) | |
1659 | return (ret); | |
1660 | while (taskqueue_cancel(zfsvfs_taskq->tq_queue, | |
1661 | &zfsvfs->z_unlinked_drain_task, NULL) != 0) | |
1662 | taskqueue_drain(zfsvfs_taskq->tq_queue, | |
1663 | &zfsvfs->z_unlinked_drain_task); | |
1664 | ||
1665 | VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); | |
1666 | os = zfsvfs->z_os; | |
1667 | ||
1668 | /* | |
1669 | * z_os will be NULL if there was an error in | |
1670 | * attempting to reopen zfsvfs. | |
1671 | */ | |
1672 | if (os != NULL) { | |
1673 | /* | |
1674 | * Unset the objset user_ptr. | |
1675 | */ | |
1676 | mutex_enter(&os->os_user_ptr_lock); | |
1677 | dmu_objset_set_user(os, NULL); | |
1678 | mutex_exit(&os->os_user_ptr_lock); | |
1679 | ||
1680 | /* | |
1681 | * Finally release the objset | |
1682 | */ | |
1683 | dmu_objset_disown(os, B_TRUE, zfsvfs); | |
1684 | } | |
1685 | ||
1686 | /* | |
1687 | * We can now safely destroy the '.zfs' directory node. | |
1688 | */ | |
1689 | if (zfsvfs->z_ctldir != NULL) | |
1690 | zfsctl_destroy(zfsvfs); | |
1691 | zfs_freevfs(vfsp); | |
1692 | ||
1693 | return (0); | |
1694 | } | |
1695 | ||
1696 | static int | |
1697 | zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) | |
1698 | { | |
1699 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1700 | znode_t *zp; | |
1701 | int err; | |
1702 | ||
1703 | /* | |
1704 | * zfs_zget() can't operate on virtual entries like .zfs/ or | |
1705 | * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. | |
1706 | * This will make NFS to switch to LOOKUP instead of using VGET. | |
1707 | */ | |
1708 | if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR || | |
1709 | (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir)) | |
1710 | return (EOPNOTSUPP); | |
1711 | ||
1712 | ZFS_ENTER(zfsvfs); | |
1713 | err = zfs_zget(zfsvfs, ino, &zp); | |
1714 | if (err == 0 && zp->z_unlinked) { | |
1715 | vrele(ZTOV(zp)); | |
1716 | err = EINVAL; | |
1717 | } | |
1718 | if (err == 0) | |
1719 | *vpp = ZTOV(zp); | |
1720 | ZFS_EXIT(zfsvfs); | |
1721 | if (err == 0) { | |
1722 | err = vn_lock(*vpp, flags); | |
1723 | if (err != 0) | |
1724 | vrele(*vpp); | |
1725 | } | |
1726 | if (err != 0) | |
1727 | *vpp = NULL; | |
1728 | return (err); | |
1729 | } | |
1730 | ||
1c08fa8b | 1731 | static int |
2e6af52b | 1732 | #if __FreeBSD_version >= 1300098 |
1c08fa8b RM |
1733 | zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, uint64_t *extflagsp, |
1734 | struct ucred **credanonp, int *numsecflavors, int *secflavors) | |
2e6af52b | 1735 | #else |
9f0a21e6 MM |
1736 | zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, |
1737 | struct ucred **credanonp, int *numsecflavors, int **secflavors) | |
2e6af52b | 1738 | #endif |
9f0a21e6 MM |
1739 | { |
1740 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1741 | ||
1742 | /* | |
1743 | * If this is regular file system vfsp is the same as | |
1744 | * zfsvfs->z_parent->z_vfs, but if it is snapshot, | |
1745 | * zfsvfs->z_parent->z_vfs represents parent file system | |
1746 | * which we have to use here, because only this file system | |
1747 | * has mnt_export configured. | |
1748 | */ | |
1749 | return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, | |
1750 | credanonp, numsecflavors, secflavors)); | |
1751 | } | |
1752 | ||
1753 | CTASSERT(SHORT_FID_LEN <= sizeof (struct fid)); | |
1754 | CTASSERT(LONG_FID_LEN <= sizeof (struct fid)); | |
1755 | ||
1756 | static int | |
1757 | zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp) | |
1758 | { | |
1759 | struct componentname cn; | |
1760 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1761 | znode_t *zp; | |
1762 | vnode_t *dvp; | |
1763 | uint64_t object = 0; | |
1764 | uint64_t fid_gen = 0; | |
1765 | uint64_t gen_mask; | |
1766 | uint64_t zp_gen; | |
1767 | int i, err; | |
1768 | ||
1769 | *vpp = NULL; | |
1770 | ||
1771 | ZFS_ENTER(zfsvfs); | |
1772 | ||
1773 | /* | |
1774 | * On FreeBSD we can get snapshot's mount point or its parent file | |
1775 | * system mount point depending if snapshot is already mounted or not. | |
1776 | */ | |
1777 | if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) { | |
1778 | zfid_long_t *zlfid = (zfid_long_t *)fidp; | |
1779 | uint64_t objsetid = 0; | |
1780 | uint64_t setgen = 0; | |
1781 | ||
1782 | for (i = 0; i < sizeof (zlfid->zf_setid); i++) | |
1783 | objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); | |
1784 | ||
1785 | for (i = 0; i < sizeof (zlfid->zf_setgen); i++) | |
1786 | setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); | |
1787 | ||
1788 | ZFS_EXIT(zfsvfs); | |
1789 | ||
1790 | err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); | |
1791 | if (err) | |
1792 | return (SET_ERROR(EINVAL)); | |
1793 | ZFS_ENTER(zfsvfs); | |
1794 | } | |
1795 | ||
1796 | if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { | |
1797 | zfid_short_t *zfid = (zfid_short_t *)fidp; | |
1798 | ||
1799 | for (i = 0; i < sizeof (zfid->zf_object); i++) | |
1800 | object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); | |
1801 | ||
1802 | for (i = 0; i < sizeof (zfid->zf_gen); i++) | |
1803 | fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); | |
1804 | } else { | |
1805 | ZFS_EXIT(zfsvfs); | |
1806 | return (SET_ERROR(EINVAL)); | |
1807 | } | |
1808 | ||
1809 | /* | |
1810 | * A zero fid_gen means we are in .zfs or the .zfs/snapshot | |
1811 | * directory tree. If the object == zfsvfs->z_shares_dir, then | |
1812 | * we are in the .zfs/shares directory tree. | |
1813 | */ | |
1814 | if ((fid_gen == 0 && | |
1815 | (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) || | |
1816 | (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) { | |
1817 | ZFS_EXIT(zfsvfs); | |
1818 | VERIFY0(zfsctl_root(zfsvfs, LK_SHARED, &dvp)); | |
1819 | if (object == ZFSCTL_INO_SNAPDIR) { | |
1820 | cn.cn_nameptr = "snapshot"; | |
1821 | cn.cn_namelen = strlen(cn.cn_nameptr); | |
1822 | cn.cn_nameiop = LOOKUP; | |
1823 | cn.cn_flags = ISLASTCN | LOCKLEAF; | |
1824 | cn.cn_lkflags = flags; | |
1825 | VERIFY0(VOP_LOOKUP(dvp, vpp, &cn)); | |
1826 | vput(dvp); | |
1827 | } else if (object == zfsvfs->z_shares_dir) { | |
1828 | /* | |
1829 | * XXX This branch must not be taken, | |
1830 | * if it is, then the lookup below will | |
1831 | * explode. | |
1832 | */ | |
1833 | cn.cn_nameptr = "shares"; | |
1834 | cn.cn_namelen = strlen(cn.cn_nameptr); | |
1835 | cn.cn_nameiop = LOOKUP; | |
1836 | cn.cn_flags = ISLASTCN; | |
1837 | cn.cn_lkflags = flags; | |
1838 | VERIFY0(VOP_LOOKUP(dvp, vpp, &cn)); | |
1839 | vput(dvp); | |
1840 | } else { | |
1841 | *vpp = dvp; | |
1842 | } | |
1843 | return (err); | |
1844 | } | |
1845 | ||
1846 | gen_mask = -1ULL >> (64 - 8 * i); | |
1847 | ||
1848 | dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); | |
1849 | if ((err = zfs_zget(zfsvfs, object, &zp))) { | |
1850 | ZFS_EXIT(zfsvfs); | |
1851 | return (err); | |
1852 | } | |
1853 | (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, | |
1854 | sizeof (uint64_t)); | |
1855 | zp_gen = zp_gen & gen_mask; | |
1856 | if (zp_gen == 0) | |
1857 | zp_gen = 1; | |
1858 | if (zp->z_unlinked || zp_gen != fid_gen) { | |
1859 | dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); | |
1860 | vrele(ZTOV(zp)); | |
1861 | ZFS_EXIT(zfsvfs); | |
1862 | return (SET_ERROR(EINVAL)); | |
1863 | } | |
1864 | ||
1865 | *vpp = ZTOV(zp); | |
1866 | ZFS_EXIT(zfsvfs); | |
1867 | err = vn_lock(*vpp, flags); | |
1868 | if (err == 0) | |
1869 | vnode_create_vobject(*vpp, zp->z_size, curthread); | |
1870 | else | |
1871 | *vpp = NULL; | |
1872 | return (err); | |
1873 | } | |
1874 | ||
1875 | /* | |
1876 | * Block out VOPs and close zfsvfs_t::z_os | |
1877 | * | |
1878 | * Note, if successful, then we return with the 'z_teardown_lock' and | |
1879 | * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying | |
1880 | * dataset and objset intact so that they can be atomically handed off during | |
1881 | * a subsequent rollback or recv operation and the resume thereafter. | |
1882 | */ | |
1883 | int | |
1884 | zfs_suspend_fs(zfsvfs_t *zfsvfs) | |
1885 | { | |
1886 | int error; | |
1887 | ||
1888 | if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) | |
1889 | return (error); | |
1890 | ||
1891 | return (0); | |
1892 | } | |
1893 | ||
1894 | /* | |
1895 | * Rebuild SA and release VOPs. Note that ownership of the underlying dataset | |
1896 | * is an invariant across any of the operations that can be performed while the | |
1897 | * filesystem was suspended. Whether it succeeded or failed, the preconditions | |
1898 | * are the same: the relevant objset and associated dataset are owned by | |
1899 | * zfsvfs, held, and long held on entry. | |
1900 | */ | |
1901 | int | |
1902 | zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) | |
1903 | { | |
1904 | int err; | |
1905 | znode_t *zp; | |
1906 | ||
1907 | ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock)); | |
8e7fe49b | 1908 | ASSERT(ZFS_TEARDOWN_INACTIVE_WLOCKED(zfsvfs)); |
9f0a21e6 MM |
1909 | |
1910 | /* | |
1911 | * We already own this, so just update the objset_t, as the one we | |
1912 | * had before may have been evicted. | |
1913 | */ | |
1914 | objset_t *os; | |
1915 | VERIFY3P(ds->ds_owner, ==, zfsvfs); | |
1916 | VERIFY(dsl_dataset_long_held(ds)); | |
1917 | dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); | |
1918 | dsl_pool_config_enter(dp, FTAG); | |
1919 | VERIFY0(dmu_objset_from_ds(ds, &os)); | |
1920 | dsl_pool_config_exit(dp, FTAG); | |
1921 | ||
1922 | err = zfsvfs_init(zfsvfs, os); | |
1923 | if (err != 0) | |
1924 | goto bail; | |
1925 | ||
1926 | ds->ds_dir->dd_activity_cancelled = B_FALSE; | |
1927 | VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); | |
1928 | ||
1929 | zfs_set_fuid_feature(zfsvfs); | |
1930 | ||
1931 | /* | |
1932 | * Attempt to re-establish all the active znodes with | |
1933 | * their dbufs. If a zfs_rezget() fails, then we'll let | |
1934 | * any potential callers discover that via ZFS_ENTER_VERIFY_VP | |
1935 | * when they try to use their znode. | |
1936 | */ | |
1937 | mutex_enter(&zfsvfs->z_znodes_lock); | |
1938 | for (zp = list_head(&zfsvfs->z_all_znodes); zp; | |
1939 | zp = list_next(&zfsvfs->z_all_znodes, zp)) { | |
1940 | (void) zfs_rezget(zp); | |
1941 | } | |
1942 | mutex_exit(&zfsvfs->z_znodes_lock); | |
1943 | ||
1944 | bail: | |
1945 | /* release the VOPs */ | |
8e7fe49b | 1946 | ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
1947 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); |
1948 | ||
1949 | if (err) { | |
1950 | /* | |
1951 | * Since we couldn't setup the sa framework, try to force | |
1952 | * unmount this file system. | |
1953 | */ | |
1954 | if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) { | |
1955 | vfs_ref(zfsvfs->z_vfs); | |
1956 | (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); | |
1957 | } | |
1958 | } | |
1959 | return (err); | |
1960 | } | |
1961 | ||
1962 | static void | |
1963 | zfs_freevfs(vfs_t *vfsp) | |
1964 | { | |
1965 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1966 | ||
1967 | zfsvfs_free(zfsvfs); | |
1968 | ||
1969 | atomic_dec_32(&zfs_active_fs_count); | |
1970 | } | |
1971 | ||
1972 | #ifdef __i386__ | |
1973 | static int desiredvnodes_backup; | |
47ed79ff MM |
1974 | #include <sys/vmmeter.h> |
1975 | ||
1976 | ||
1977 | #include <vm/vm_page.h> | |
1978 | #include <vm/vm_object.h> | |
1979 | #include <vm/vm_kern.h> | |
1980 | #include <vm/vm_map.h> | |
9f0a21e6 MM |
1981 | #endif |
1982 | ||
1983 | static void | |
1984 | zfs_vnodes_adjust(void) | |
1985 | { | |
1986 | #ifdef __i386__ | |
1987 | int newdesiredvnodes; | |
1988 | ||
1989 | desiredvnodes_backup = desiredvnodes; | |
1990 | ||
1991 | /* | |
1992 | * We calculate newdesiredvnodes the same way it is done in | |
1993 | * vntblinit(). If it is equal to desiredvnodes, it means that | |
1994 | * it wasn't tuned by the administrator and we can tune it down. | |
1995 | */ | |
1996 | newdesiredvnodes = min(maxproc + vm_cnt.v_page_count / 4, 2 * | |
1997 | vm_kmem_size / (5 * (sizeof (struct vm_object) + | |
1998 | sizeof (struct vnode)))); | |
1999 | if (newdesiredvnodes == desiredvnodes) | |
2000 | desiredvnodes = (3 * newdesiredvnodes) / 4; | |
2001 | #endif | |
2002 | } | |
2003 | ||
2004 | static void | |
2005 | zfs_vnodes_adjust_back(void) | |
2006 | { | |
2007 | ||
2008 | #ifdef __i386__ | |
2009 | desiredvnodes = desiredvnodes_backup; | |
2010 | #endif | |
2011 | } | |
2012 | ||
2013 | void | |
2014 | zfs_init(void) | |
2015 | { | |
2016 | ||
2017 | printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n"); | |
2018 | ||
2019 | /* | |
2020 | * Initialize .zfs directory structures | |
2021 | */ | |
2022 | zfsctl_init(); | |
2023 | ||
2024 | /* | |
2025 | * Initialize znode cache, vnode ops, etc... | |
2026 | */ | |
2027 | zfs_znode_init(); | |
2028 | ||
2029 | /* | |
2030 | * Reduce number of vnodes. Originally number of vnodes is calculated | |
2031 | * with UFS inode in mind. We reduce it here, because it's too big for | |
2032 | * ZFS/i386. | |
2033 | */ | |
2034 | zfs_vnodes_adjust(); | |
2035 | ||
7bcb7f08 | 2036 | dmu_objset_register_type(DMU_OST_ZFS, zpl_get_file_info); |
9f0a21e6 MM |
2037 | |
2038 | zfsvfs_taskq = taskq_create("zfsvfs", 1, minclsyspri, 0, 0, 0); | |
2039 | } | |
2040 | ||
2041 | void | |
2042 | zfs_fini(void) | |
2043 | { | |
2044 | taskq_destroy(zfsvfs_taskq); | |
2045 | zfsctl_fini(); | |
2046 | zfs_znode_fini(); | |
2047 | zfs_vnodes_adjust_back(); | |
2048 | } | |
2049 | ||
2050 | int | |
2051 | zfs_busy(void) | |
2052 | { | |
2053 | return (zfs_active_fs_count != 0); | |
2054 | } | |
2055 | ||
2056 | /* | |
2057 | * Release VOPs and unmount a suspended filesystem. | |
2058 | */ | |
2059 | int | |
2060 | zfs_end_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) | |
2061 | { | |
2062 | ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock)); | |
8e7fe49b | 2063 | ASSERT(ZFS_TEARDOWN_INACTIVE_WLOCKED(zfsvfs)); |
9f0a21e6 MM |
2064 | |
2065 | /* | |
2066 | * We already own this, so just hold and rele it to update the | |
2067 | * objset_t, as the one we had before may have been evicted. | |
2068 | */ | |
2069 | objset_t *os; | |
2070 | VERIFY3P(ds->ds_owner, ==, zfsvfs); | |
2071 | VERIFY(dsl_dataset_long_held(ds)); | |
2072 | dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); | |
2073 | dsl_pool_config_enter(dp, FTAG); | |
2074 | VERIFY0(dmu_objset_from_ds(ds, &os)); | |
2075 | dsl_pool_config_exit(dp, FTAG); | |
2076 | zfsvfs->z_os = os; | |
2077 | ||
2078 | /* release the VOPs */ | |
8e7fe49b | 2079 | ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs); |
9f0a21e6 MM |
2080 | rrm_exit(&zfsvfs->z_teardown_lock, FTAG); |
2081 | ||
2082 | /* | |
2083 | * Try to force unmount this file system. | |
2084 | */ | |
2085 | (void) zfs_umount(zfsvfs->z_vfs, 0); | |
2086 | zfsvfs->z_unmounted = B_TRUE; | |
2087 | return (0); | |
2088 | } | |
2089 | ||
2090 | int | |
2091 | zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) | |
2092 | { | |
2093 | int error; | |
2094 | objset_t *os = zfsvfs->z_os; | |
2095 | dmu_tx_t *tx; | |
2096 | ||
2097 | if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) | |
2098 | return (SET_ERROR(EINVAL)); | |
2099 | ||
2100 | if (newvers < zfsvfs->z_version) | |
2101 | return (SET_ERROR(EINVAL)); | |
2102 | ||
2103 | if (zfs_spa_version_map(newvers) > | |
2104 | spa_version(dmu_objset_spa(zfsvfs->z_os))) | |
2105 | return (SET_ERROR(ENOTSUP)); | |
2106 | ||
2107 | tx = dmu_tx_create(os); | |
2108 | dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); | |
2109 | if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { | |
2110 | dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, | |
2111 | ZFS_SA_ATTRS); | |
2112 | dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); | |
2113 | } | |
2114 | error = dmu_tx_assign(tx, TXG_WAIT); | |
2115 | if (error) { | |
2116 | dmu_tx_abort(tx); | |
2117 | return (error); | |
2118 | } | |
2119 | ||
2120 | error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, | |
2121 | 8, 1, &newvers, tx); | |
2122 | ||
2123 | if (error) { | |
2124 | dmu_tx_commit(tx); | |
2125 | return (error); | |
2126 | } | |
2127 | ||
2128 | if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { | |
2129 | uint64_t sa_obj; | |
2130 | ||
2131 | ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, | |
2132 | SPA_VERSION_SA); | |
2133 | sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, | |
2134 | DMU_OT_NONE, 0, tx); | |
2135 | ||
2136 | error = zap_add(os, MASTER_NODE_OBJ, | |
2137 | ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); | |
2138 | ASSERT0(error); | |
2139 | ||
2140 | VERIFY(0 == sa_set_sa_object(os, sa_obj)); | |
2141 | sa_register_update_callback(os, zfs_sa_upgrade); | |
2142 | } | |
2143 | ||
2144 | spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, | |
47ed79ff MM |
2145 | "from %ju to %ju", (uintmax_t)zfsvfs->z_version, |
2146 | (uintmax_t)newvers); | |
9f0a21e6 MM |
2147 | dmu_tx_commit(tx); |
2148 | ||
2149 | zfsvfs->z_version = newvers; | |
2150 | os->os_version = newvers; | |
2151 | ||
2152 | zfs_set_fuid_feature(zfsvfs); | |
2153 | ||
2154 | return (0); | |
2155 | } | |
2156 | ||
2157 | /* | |
2158 | * Read a property stored within the master node. | |
2159 | */ | |
2160 | int | |
2161 | zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) | |
2162 | { | |
2163 | uint64_t *cached_copy = NULL; | |
2164 | ||
2165 | /* | |
2166 | * Figure out where in the objset_t the cached copy would live, if it | |
2167 | * is available for the requested property. | |
2168 | */ | |
2169 | if (os != NULL) { | |
2170 | switch (prop) { | |
2171 | case ZFS_PROP_VERSION: | |
2172 | cached_copy = &os->os_version; | |
2173 | break; | |
2174 | case ZFS_PROP_NORMALIZE: | |
2175 | cached_copy = &os->os_normalization; | |
2176 | break; | |
2177 | case ZFS_PROP_UTF8ONLY: | |
2178 | cached_copy = &os->os_utf8only; | |
2179 | break; | |
2180 | case ZFS_PROP_CASE: | |
2181 | cached_copy = &os->os_casesensitivity; | |
2182 | break; | |
2183 | default: | |
2184 | break; | |
2185 | } | |
2186 | } | |
2187 | if (cached_copy != NULL && *cached_copy != OBJSET_PROP_UNINITIALIZED) { | |
2188 | *value = *cached_copy; | |
2189 | return (0); | |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * If the property wasn't cached, look up the file system's value for | |
2194 | * the property. For the version property, we look up a slightly | |
2195 | * different string. | |
2196 | */ | |
2197 | const char *pname; | |
2198 | int error = ENOENT; | |
2199 | if (prop == ZFS_PROP_VERSION) { | |
2200 | pname = ZPL_VERSION_STR; | |
2201 | } else { | |
2202 | pname = zfs_prop_to_name(prop); | |
2203 | } | |
2204 | ||
2205 | if (os != NULL) { | |
2206 | ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS); | |
2207 | error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); | |
2208 | } | |
2209 | ||
2210 | if (error == ENOENT) { | |
2211 | /* No value set, use the default value */ | |
2212 | switch (prop) { | |
2213 | case ZFS_PROP_VERSION: | |
2214 | *value = ZPL_VERSION; | |
2215 | break; | |
2216 | case ZFS_PROP_NORMALIZE: | |
2217 | case ZFS_PROP_UTF8ONLY: | |
2218 | *value = 0; | |
2219 | break; | |
2220 | case ZFS_PROP_CASE: | |
2221 | *value = ZFS_CASE_SENSITIVE; | |
2222 | break; | |
2223 | default: | |
2224 | return (error); | |
2225 | } | |
2226 | error = 0; | |
2227 | } | |
2228 | ||
2229 | /* | |
2230 | * If one of the methods for getting the property value above worked, | |
2231 | * copy it into the objset_t's cache. | |
2232 | */ | |
2233 | if (error == 0 && cached_copy != NULL) { | |
2234 | *cached_copy = *value; | |
2235 | } | |
2236 | ||
2237 | return (error); | |
2238 | } | |
2239 | ||
2240 | /* | |
dd4bc569 | 2241 | * Return true if the corresponding vfs's unmounted flag is set. |
9f0a21e6 MM |
2242 | * Otherwise return false. |
2243 | * If this function returns true we know VFS unmount has been initiated. | |
2244 | */ | |
2245 | boolean_t | |
2246 | zfs_get_vfs_flag_unmounted(objset_t *os) | |
2247 | { | |
2248 | zfsvfs_t *zfvp; | |
2249 | boolean_t unmounted = B_FALSE; | |
2250 | ||
2251 | ASSERT(dmu_objset_type(os) == DMU_OST_ZFS); | |
2252 | ||
2253 | mutex_enter(&os->os_user_ptr_lock); | |
2254 | zfvp = dmu_objset_get_user(os); | |
2255 | if (zfvp != NULL && zfvp->z_vfs != NULL && | |
2256 | (zfvp->z_vfs->mnt_kern_flag & MNTK_UNMOUNT)) | |
2257 | unmounted = B_TRUE; | |
2258 | mutex_exit(&os->os_user_ptr_lock); | |
2259 | ||
2260 | return (unmounted); | |
2261 | } | |
2262 | ||
2263 | #ifdef _KERNEL | |
2264 | void | |
2265 | zfsvfs_update_fromname(const char *oldname, const char *newname) | |
2266 | { | |
2267 | char tmpbuf[MAXPATHLEN]; | |
2268 | struct mount *mp; | |
2269 | char *fromname; | |
2270 | size_t oldlen; | |
2271 | ||
2272 | oldlen = strlen(oldname); | |
2273 | ||
2274 | mtx_lock(&mountlist_mtx); | |
2275 | TAILQ_FOREACH(mp, &mountlist, mnt_list) { | |
2276 | fromname = mp->mnt_stat.f_mntfromname; | |
2277 | if (strcmp(fromname, oldname) == 0) { | |
2278 | (void) strlcpy(fromname, newname, | |
2279 | sizeof (mp->mnt_stat.f_mntfromname)); | |
2280 | continue; | |
2281 | } | |
2282 | if (strncmp(fromname, oldname, oldlen) == 0 && | |
2283 | (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { | |
2284 | (void) snprintf(tmpbuf, sizeof (tmpbuf), "%s%s", | |
2285 | newname, fromname + oldlen); | |
2286 | (void) strlcpy(fromname, tmpbuf, | |
2287 | sizeof (mp->mnt_stat.f_mntfromname)); | |
2288 | continue; | |
2289 | } | |
2290 | } | |
2291 | mtx_unlock(&mountlist_mtx); | |
2292 | } | |
2293 | #endif |