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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 2008 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
26 | #pragma ident "@(#)zfs_vfsops.c 1.41 08/04/11 SMI" | |
27 | ||
28 | #include <sys/types.h> | |
29 | #include <sys/param.h> | |
30 | #include <sys/systm.h> | |
31 | #include <sys/sysmacros.h> | |
32 | #include <sys/kmem.h> | |
33 | #include <sys/pathname.h> | |
34 | #include <sys/vnode.h> | |
35 | #include <sys/vfs.h> | |
36 | #include <sys/vfs_opreg.h> | |
37 | #include <sys/mntent.h> | |
38 | #include <sys/mount.h> | |
39 | #include <sys/cmn_err.h> | |
40 | #include "fs/fs_subr.h" | |
41 | #include <sys/zfs_znode.h> | |
42 | #include <sys/zfs_dir.h> | |
43 | #include <sys/zil.h> | |
44 | #include <sys/fs/zfs.h> | |
45 | #include <sys/dmu.h> | |
46 | #include <sys/dsl_prop.h> | |
47 | #include <sys/dsl_dataset.h> | |
48 | #include <sys/dsl_deleg.h> | |
49 | #include <sys/spa.h> | |
50 | #include <sys/zap.h> | |
51 | #include <sys/varargs.h> | |
52 | #include <sys/policy.h> | |
53 | #include <sys/atomic.h> | |
54 | #include <sys/mkdev.h> | |
55 | #include <sys/modctl.h> | |
56 | #include <sys/refstr.h> | |
57 | #include <sys/zfs_ioctl.h> | |
58 | #include <sys/zfs_ctldir.h> | |
59 | #include <sys/zfs_fuid.h> | |
60 | #include <sys/bootconf.h> | |
61 | #include <sys/sunddi.h> | |
62 | #include <sys/dnlc.h> | |
63 | #include <sys/dmu_objset.h> | |
64 | #include <sys/spa_boot.h> | |
65 | ||
66 | int zfsfstype; | |
67 | vfsops_t *zfs_vfsops = NULL; | |
68 | static major_t zfs_major; | |
69 | static minor_t zfs_minor; | |
70 | static kmutex_t zfs_dev_mtx; | |
71 | ||
72 | static int zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr); | |
73 | static int zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr); | |
74 | static int zfs_mountroot(vfs_t *vfsp, enum whymountroot); | |
75 | static int zfs_root(vfs_t *vfsp, vnode_t **vpp); | |
76 | static int zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp); | |
77 | static int zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp); | |
78 | static void zfs_freevfs(vfs_t *vfsp); | |
79 | ||
80 | static const fs_operation_def_t zfs_vfsops_template[] = { | |
81 | VFSNAME_MOUNT, { .vfs_mount = zfs_mount }, | |
82 | VFSNAME_MOUNTROOT, { .vfs_mountroot = zfs_mountroot }, | |
83 | VFSNAME_UNMOUNT, { .vfs_unmount = zfs_umount }, | |
84 | VFSNAME_ROOT, { .vfs_root = zfs_root }, | |
85 | VFSNAME_STATVFS, { .vfs_statvfs = zfs_statvfs }, | |
86 | VFSNAME_SYNC, { .vfs_sync = zfs_sync }, | |
87 | VFSNAME_VGET, { .vfs_vget = zfs_vget }, | |
88 | VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs }, | |
89 | NULL, NULL | |
90 | }; | |
91 | ||
92 | static const fs_operation_def_t zfs_vfsops_eio_template[] = { | |
93 | VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs }, | |
94 | NULL, NULL | |
95 | }; | |
96 | ||
97 | /* | |
98 | * We need to keep a count of active fs's. | |
99 | * This is necessary to prevent our module | |
100 | * from being unloaded after a umount -f | |
101 | */ | |
102 | static uint32_t zfs_active_fs_count = 0; | |
103 | ||
104 | static char *noatime_cancel[] = { MNTOPT_ATIME, NULL }; | |
105 | static char *atime_cancel[] = { MNTOPT_NOATIME, NULL }; | |
106 | static char *noxattr_cancel[] = { MNTOPT_XATTR, NULL }; | |
107 | static char *xattr_cancel[] = { MNTOPT_NOXATTR, NULL }; | |
108 | ||
109 | /* | |
110 | * MO_DEFAULT is not used since the default value is determined | |
111 | * by the equivalent property. | |
112 | */ | |
113 | static mntopt_t mntopts[] = { | |
114 | { MNTOPT_NOXATTR, noxattr_cancel, NULL, 0, NULL }, | |
115 | { MNTOPT_XATTR, xattr_cancel, NULL, 0, NULL }, | |
116 | { MNTOPT_NOATIME, noatime_cancel, NULL, 0, NULL }, | |
117 | { MNTOPT_ATIME, atime_cancel, NULL, 0, NULL } | |
118 | }; | |
119 | ||
120 | static mntopts_t zfs_mntopts = { | |
121 | sizeof (mntopts) / sizeof (mntopt_t), | |
122 | mntopts | |
123 | }; | |
124 | ||
125 | /*ARGSUSED*/ | |
126 | int | |
127 | zfs_sync(vfs_t *vfsp, short flag, cred_t *cr) | |
128 | { | |
129 | /* | |
130 | * Data integrity is job one. We don't want a compromised kernel | |
131 | * writing to the storage pool, so we never sync during panic. | |
132 | */ | |
133 | if (panicstr) | |
134 | return (0); | |
135 | ||
136 | /* | |
137 | * SYNC_ATTR is used by fsflush() to force old filesystems like UFS | |
138 | * to sync metadata, which they would otherwise cache indefinitely. | |
139 | * Semantically, the only requirement is that the sync be initiated. | |
140 | * The DMU syncs out txgs frequently, so there's nothing to do. | |
141 | */ | |
142 | if (flag & SYNC_ATTR) | |
143 | return (0); | |
144 | ||
145 | if (vfsp != NULL) { | |
146 | /* | |
147 | * Sync a specific filesystem. | |
148 | */ | |
149 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
150 | ||
151 | ZFS_ENTER(zfsvfs); | |
152 | if (zfsvfs->z_log != NULL) | |
153 | zil_commit(zfsvfs->z_log, UINT64_MAX, 0); | |
154 | else | |
155 | txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); | |
156 | ZFS_EXIT(zfsvfs); | |
157 | } else { | |
158 | /* | |
159 | * Sync all ZFS filesystems. This is what happens when you | |
160 | * run sync(1M). Unlike other filesystems, ZFS honors the | |
161 | * request by waiting for all pools to commit all dirty data. | |
162 | */ | |
163 | spa_sync_allpools(); | |
164 | } | |
165 | ||
166 | return (0); | |
167 | } | |
168 | ||
169 | static int | |
170 | zfs_create_unique_device(dev_t *dev) | |
171 | { | |
172 | major_t new_major; | |
173 | ||
174 | do { | |
175 | ASSERT3U(zfs_minor, <=, MAXMIN32); | |
176 | minor_t start = zfs_minor; | |
177 | do { | |
178 | mutex_enter(&zfs_dev_mtx); | |
179 | if (zfs_minor >= MAXMIN32) { | |
180 | /* | |
181 | * If we're still using the real major | |
182 | * keep out of /dev/zfs and /dev/zvol minor | |
183 | * number space. If we're using a getudev()'ed | |
184 | * major number, we can use all of its minors. | |
185 | */ | |
186 | if (zfs_major == ddi_name_to_major(ZFS_DRIVER)) | |
187 | zfs_minor = ZFS_MIN_MINOR; | |
188 | else | |
189 | zfs_minor = 0; | |
190 | } else { | |
191 | zfs_minor++; | |
192 | } | |
193 | *dev = makedevice(zfs_major, zfs_minor); | |
194 | mutex_exit(&zfs_dev_mtx); | |
195 | } while (vfs_devismounted(*dev) && zfs_minor != start); | |
196 | if (zfs_minor == start) { | |
197 | /* | |
198 | * We are using all ~262,000 minor numbers for the | |
199 | * current major number. Create a new major number. | |
200 | */ | |
201 | if ((new_major = getudev()) == (major_t)-1) { | |
202 | cmn_err(CE_WARN, | |
203 | "zfs_mount: Can't get unique major " | |
204 | "device number."); | |
205 | return (-1); | |
206 | } | |
207 | mutex_enter(&zfs_dev_mtx); | |
208 | zfs_major = new_major; | |
209 | zfs_minor = 0; | |
210 | ||
211 | mutex_exit(&zfs_dev_mtx); | |
212 | } else { | |
213 | break; | |
214 | } | |
215 | /* CONSTANTCONDITION */ | |
216 | } while (1); | |
217 | ||
218 | return (0); | |
219 | } | |
220 | ||
221 | static void | |
222 | atime_changed_cb(void *arg, uint64_t newval) | |
223 | { | |
224 | zfsvfs_t *zfsvfs = arg; | |
225 | ||
226 | if (newval == TRUE) { | |
227 | zfsvfs->z_atime = TRUE; | |
228 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); | |
229 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); | |
230 | } else { | |
231 | zfsvfs->z_atime = FALSE; | |
232 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); | |
233 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); | |
234 | } | |
235 | } | |
236 | ||
237 | static void | |
238 | xattr_changed_cb(void *arg, uint64_t newval) | |
239 | { | |
240 | zfsvfs_t *zfsvfs = arg; | |
241 | ||
242 | if (newval == TRUE) { | |
243 | /* XXX locking on vfs_flag? */ | |
244 | zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; | |
245 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); | |
246 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); | |
247 | } else { | |
248 | /* XXX locking on vfs_flag? */ | |
249 | zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; | |
250 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); | |
251 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); | |
252 | } | |
253 | } | |
254 | ||
255 | static void | |
256 | blksz_changed_cb(void *arg, uint64_t newval) | |
257 | { | |
258 | zfsvfs_t *zfsvfs = arg; | |
259 | ||
260 | if (newval < SPA_MINBLOCKSIZE || | |
261 | newval > SPA_MAXBLOCKSIZE || !ISP2(newval)) | |
262 | newval = SPA_MAXBLOCKSIZE; | |
263 | ||
264 | zfsvfs->z_max_blksz = newval; | |
265 | zfsvfs->z_vfs->vfs_bsize = newval; | |
266 | } | |
267 | ||
268 | static void | |
269 | readonly_changed_cb(void *arg, uint64_t newval) | |
270 | { | |
271 | zfsvfs_t *zfsvfs = arg; | |
272 | ||
273 | if (newval) { | |
274 | /* XXX locking on vfs_flag? */ | |
275 | zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; | |
276 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); | |
277 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); | |
278 | } else { | |
279 | /* XXX locking on vfs_flag? */ | |
280 | zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; | |
281 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); | |
282 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); | |
283 | } | |
284 | } | |
285 | ||
286 | static void | |
287 | devices_changed_cb(void *arg, uint64_t newval) | |
288 | { | |
289 | zfsvfs_t *zfsvfs = arg; | |
290 | ||
291 | if (newval == FALSE) { | |
292 | zfsvfs->z_vfs->vfs_flag |= VFS_NODEVICES; | |
293 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES); | |
294 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES, NULL, 0); | |
295 | } else { | |
296 | zfsvfs->z_vfs->vfs_flag &= ~VFS_NODEVICES; | |
297 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES); | |
298 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES, NULL, 0); | |
299 | } | |
300 | } | |
301 | ||
302 | static void | |
303 | setuid_changed_cb(void *arg, uint64_t newval) | |
304 | { | |
305 | zfsvfs_t *zfsvfs = arg; | |
306 | ||
307 | if (newval == FALSE) { | |
308 | zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; | |
309 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); | |
310 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); | |
311 | } else { | |
312 | zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; | |
313 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); | |
314 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); | |
315 | } | |
316 | } | |
317 | ||
318 | static void | |
319 | exec_changed_cb(void *arg, uint64_t newval) | |
320 | { | |
321 | zfsvfs_t *zfsvfs = arg; | |
322 | ||
323 | if (newval == FALSE) { | |
324 | zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; | |
325 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); | |
326 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); | |
327 | } else { | |
328 | zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; | |
329 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); | |
330 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); | |
331 | } | |
332 | } | |
333 | ||
334 | /* | |
335 | * The nbmand mount option can be changed at mount time. | |
336 | * We can't allow it to be toggled on live file systems or incorrect | |
337 | * behavior may be seen from cifs clients | |
338 | * | |
339 | * This property isn't registered via dsl_prop_register(), but this callback | |
340 | * will be called when a file system is first mounted | |
341 | */ | |
342 | static void | |
343 | nbmand_changed_cb(void *arg, uint64_t newval) | |
344 | { | |
345 | zfsvfs_t *zfsvfs = arg; | |
346 | if (newval == FALSE) { | |
347 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); | |
348 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); | |
349 | } else { | |
350 | vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); | |
351 | vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); | |
352 | } | |
353 | } | |
354 | ||
355 | static void | |
356 | snapdir_changed_cb(void *arg, uint64_t newval) | |
357 | { | |
358 | zfsvfs_t *zfsvfs = arg; | |
359 | ||
360 | zfsvfs->z_show_ctldir = newval; | |
361 | } | |
362 | ||
363 | static void | |
364 | vscan_changed_cb(void *arg, uint64_t newval) | |
365 | { | |
366 | zfsvfs_t *zfsvfs = arg; | |
367 | ||
368 | zfsvfs->z_vscan = newval; | |
369 | } | |
370 | ||
371 | static void | |
372 | acl_mode_changed_cb(void *arg, uint64_t newval) | |
373 | { | |
374 | zfsvfs_t *zfsvfs = arg; | |
375 | ||
376 | zfsvfs->z_acl_mode = newval; | |
377 | } | |
378 | ||
379 | static void | |
380 | acl_inherit_changed_cb(void *arg, uint64_t newval) | |
381 | { | |
382 | zfsvfs_t *zfsvfs = arg; | |
383 | ||
384 | zfsvfs->z_acl_inherit = newval; | |
385 | } | |
386 | ||
387 | static int | |
388 | zfs_register_callbacks(vfs_t *vfsp) | |
389 | { | |
390 | struct dsl_dataset *ds = NULL; | |
391 | objset_t *os = NULL; | |
392 | zfsvfs_t *zfsvfs = NULL; | |
393 | uint64_t nbmand; | |
394 | int readonly, do_readonly = B_FALSE; | |
395 | int setuid, do_setuid = B_FALSE; | |
396 | int exec, do_exec = B_FALSE; | |
397 | int devices, do_devices = B_FALSE; | |
398 | int xattr, do_xattr = B_FALSE; | |
399 | int atime, do_atime = B_FALSE; | |
400 | int error = 0; | |
401 | ||
402 | ASSERT(vfsp); | |
403 | zfsvfs = vfsp->vfs_data; | |
404 | ASSERT(zfsvfs); | |
405 | os = zfsvfs->z_os; | |
406 | ||
407 | /* | |
408 | * The act of registering our callbacks will destroy any mount | |
409 | * options we may have. In order to enable temporary overrides | |
410 | * of mount options, we stash away the current values and | |
411 | * restore them after we register the callbacks. | |
412 | */ | |
413 | if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) { | |
414 | readonly = B_TRUE; | |
415 | do_readonly = B_TRUE; | |
416 | } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { | |
417 | readonly = B_FALSE; | |
418 | do_readonly = B_TRUE; | |
419 | } | |
420 | if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { | |
421 | devices = B_FALSE; | |
422 | setuid = B_FALSE; | |
423 | do_devices = B_TRUE; | |
424 | do_setuid = B_TRUE; | |
425 | } else { | |
426 | if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) { | |
427 | devices = B_FALSE; | |
428 | do_devices = B_TRUE; | |
429 | } else if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL)) { | |
430 | devices = B_TRUE; | |
431 | do_devices = B_TRUE; | |
432 | } | |
433 | ||
434 | if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { | |
435 | setuid = B_FALSE; | |
436 | do_setuid = B_TRUE; | |
437 | } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { | |
438 | setuid = B_TRUE; | |
439 | do_setuid = B_TRUE; | |
440 | } | |
441 | } | |
442 | if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { | |
443 | exec = B_FALSE; | |
444 | do_exec = B_TRUE; | |
445 | } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { | |
446 | exec = B_TRUE; | |
447 | do_exec = B_TRUE; | |
448 | } | |
449 | if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { | |
450 | xattr = B_FALSE; | |
451 | do_xattr = B_TRUE; | |
452 | } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { | |
453 | xattr = B_TRUE; | |
454 | do_xattr = B_TRUE; | |
455 | } | |
456 | if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { | |
457 | atime = B_FALSE; | |
458 | do_atime = B_TRUE; | |
459 | } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { | |
460 | atime = B_TRUE; | |
461 | do_atime = B_TRUE; | |
462 | } | |
463 | ||
464 | /* | |
465 | * nbmand is a special property. It can only be changed at | |
466 | * mount time. | |
467 | * | |
468 | * This is weird, but it is documented to only be changeable | |
469 | * at mount time. | |
470 | */ | |
471 | if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { | |
472 | nbmand = B_FALSE; | |
473 | } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { | |
474 | nbmand = B_TRUE; | |
475 | } else { | |
476 | char osname[MAXNAMELEN]; | |
477 | ||
478 | dmu_objset_name(os, osname); | |
479 | if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, | |
480 | NULL)) | |
481 | return (error); | |
482 | } | |
483 | ||
484 | /* | |
485 | * Register property callbacks. | |
486 | * | |
487 | * It would probably be fine to just check for i/o error from | |
488 | * the first prop_register(), but I guess I like to go | |
489 | * overboard... | |
490 | */ | |
491 | ds = dmu_objset_ds(os); | |
492 | error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs); | |
493 | error = error ? error : dsl_prop_register(ds, | |
494 | "xattr", xattr_changed_cb, zfsvfs); | |
495 | error = error ? error : dsl_prop_register(ds, | |
496 | "recordsize", blksz_changed_cb, zfsvfs); | |
497 | error = error ? error : dsl_prop_register(ds, | |
498 | "readonly", readonly_changed_cb, zfsvfs); | |
499 | error = error ? error : dsl_prop_register(ds, | |
500 | "devices", devices_changed_cb, zfsvfs); | |
501 | error = error ? error : dsl_prop_register(ds, | |
502 | "setuid", setuid_changed_cb, zfsvfs); | |
503 | error = error ? error : dsl_prop_register(ds, | |
504 | "exec", exec_changed_cb, zfsvfs); | |
505 | error = error ? error : dsl_prop_register(ds, | |
506 | "snapdir", snapdir_changed_cb, zfsvfs); | |
507 | error = error ? error : dsl_prop_register(ds, | |
508 | "aclmode", acl_mode_changed_cb, zfsvfs); | |
509 | error = error ? error : dsl_prop_register(ds, | |
510 | "aclinherit", acl_inherit_changed_cb, zfsvfs); | |
511 | error = error ? error : dsl_prop_register(ds, | |
512 | "vscan", vscan_changed_cb, zfsvfs); | |
513 | if (error) | |
514 | goto unregister; | |
515 | ||
516 | /* | |
517 | * Invoke our callbacks to restore temporary mount options. | |
518 | */ | |
519 | if (do_readonly) | |
520 | readonly_changed_cb(zfsvfs, readonly); | |
521 | if (do_setuid) | |
522 | setuid_changed_cb(zfsvfs, setuid); | |
523 | if (do_exec) | |
524 | exec_changed_cb(zfsvfs, exec); | |
525 | if (do_devices) | |
526 | devices_changed_cb(zfsvfs, devices); | |
527 | if (do_xattr) | |
528 | xattr_changed_cb(zfsvfs, xattr); | |
529 | if (do_atime) | |
530 | atime_changed_cb(zfsvfs, atime); | |
531 | ||
532 | nbmand_changed_cb(zfsvfs, nbmand); | |
533 | ||
534 | return (0); | |
535 | ||
536 | unregister: | |
537 | /* | |
538 | * We may attempt to unregister some callbacks that are not | |
539 | * registered, but this is OK; it will simply return ENOMSG, | |
540 | * which we will ignore. | |
541 | */ | |
542 | (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs); | |
543 | (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs); | |
544 | (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs); | |
545 | (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs); | |
546 | (void) dsl_prop_unregister(ds, "devices", devices_changed_cb, zfsvfs); | |
547 | (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs); | |
548 | (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs); | |
549 | (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs); | |
550 | (void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs); | |
551 | (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb, | |
552 | zfsvfs); | |
553 | (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs); | |
554 | return (error); | |
555 | ||
556 | } | |
557 | ||
558 | static int | |
559 | zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) | |
560 | { | |
561 | uint_t readonly; | |
562 | int error; | |
563 | ||
564 | error = zfs_register_callbacks(zfsvfs->z_vfs); | |
565 | if (error) | |
566 | return (error); | |
567 | ||
568 | /* | |
569 | * Set the objset user_ptr to track its zfsvfs. | |
570 | */ | |
571 | mutex_enter(&zfsvfs->z_os->os->os_user_ptr_lock); | |
572 | dmu_objset_set_user(zfsvfs->z_os, zfsvfs); | |
573 | mutex_exit(&zfsvfs->z_os->os->os_user_ptr_lock); | |
574 | ||
575 | /* | |
576 | * If we are not mounting (ie: online recv), then we don't | |
577 | * have to worry about replaying the log as we blocked all | |
578 | * operations out since we closed the ZIL. | |
579 | */ | |
580 | if (mounting) { | |
581 | /* | |
582 | * During replay we remove the read only flag to | |
583 | * allow replays to succeed. | |
584 | */ | |
585 | readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; | |
586 | if (readonly != 0) | |
587 | zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; | |
588 | else | |
589 | zfs_unlinked_drain(zfsvfs); | |
590 | ||
591 | /* | |
592 | * Parse and replay the intent log. | |
593 | * | |
594 | * Because of ziltest, this must be done after | |
595 | * zfs_unlinked_drain(). (Further note: ziltest doesn't | |
596 | * use readonly mounts, where zfs_unlinked_drain() isn't | |
597 | * called.) This is because ziltest causes spa_sync() | |
598 | * to think it's committed, but actually it is not, so | |
599 | * the intent log contains many txg's worth of changes. | |
600 | * | |
601 | * In particular, if object N is in the unlinked set in | |
602 | * the last txg to actually sync, then it could be | |
603 | * actually freed in a later txg and then reallocated in | |
604 | * a yet later txg. This would write a "create object | |
605 | * N" record to the intent log. Normally, this would be | |
606 | * fine because the spa_sync() would have written out | |
607 | * the fact that object N is free, before we could write | |
608 | * the "create object N" intent log record. | |
609 | * | |
610 | * But when we are in ziltest mode, we advance the "open | |
611 | * txg" without actually spa_sync()-ing the changes to | |
612 | * disk. So we would see that object N is still | |
613 | * allocated and in the unlinked set, and there is an | |
614 | * intent log record saying to allocate it. | |
615 | */ | |
616 | zil_replay(zfsvfs->z_os, zfsvfs, &zfsvfs->z_assign, | |
617 | zfs_replay_vector); | |
618 | ||
619 | zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ | |
620 | } | |
621 | ||
622 | if (!zil_disable) | |
623 | zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); | |
624 | ||
625 | return (0); | |
626 | } | |
627 | ||
628 | static void | |
629 | zfs_freezfsvfs(zfsvfs_t *zfsvfs) | |
630 | { | |
631 | mutex_destroy(&zfsvfs->z_znodes_lock); | |
632 | mutex_destroy(&zfsvfs->z_online_recv_lock); | |
633 | list_destroy(&zfsvfs->z_all_znodes); | |
634 | rrw_destroy(&zfsvfs->z_teardown_lock); | |
635 | rw_destroy(&zfsvfs->z_teardown_inactive_lock); | |
636 | rw_destroy(&zfsvfs->z_fuid_lock); | |
637 | kmem_free(zfsvfs, sizeof (zfsvfs_t)); | |
638 | } | |
639 | ||
640 | static int | |
641 | zfs_domount(vfs_t *vfsp, char *osname, cred_t *cr) | |
642 | { | |
643 | dev_t mount_dev; | |
644 | uint64_t recordsize, readonly; | |
645 | int error = 0; | |
646 | int mode; | |
647 | zfsvfs_t *zfsvfs; | |
648 | znode_t *zp = NULL; | |
649 | ||
650 | ASSERT(vfsp); | |
651 | ASSERT(osname); | |
652 | ||
653 | /* | |
654 | * Initialize the zfs-specific filesystem structure. | |
655 | * Should probably make this a kmem cache, shuffle fields, | |
656 | * and just bzero up to z_hold_mtx[]. | |
657 | */ | |
658 | zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); | |
659 | zfsvfs->z_vfs = vfsp; | |
660 | zfsvfs->z_parent = zfsvfs; | |
661 | zfsvfs->z_assign = TXG_NOWAIT; | |
662 | zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE; | |
663 | zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; | |
664 | ||
665 | mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); | |
666 | mutex_init(&zfsvfs->z_online_recv_lock, NULL, MUTEX_DEFAULT, NULL); | |
667 | list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), | |
668 | offsetof(znode_t, z_link_node)); | |
669 | rrw_init(&zfsvfs->z_teardown_lock); | |
670 | rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); | |
671 | rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); | |
672 | ||
673 | /* Initialize the generic filesystem structure. */ | |
674 | vfsp->vfs_bcount = 0; | |
675 | vfsp->vfs_data = NULL; | |
676 | ||
677 | if (zfs_create_unique_device(&mount_dev) == -1) { | |
678 | error = ENODEV; | |
679 | goto out; | |
680 | } | |
681 | ASSERT(vfs_devismounted(mount_dev) == 0); | |
682 | ||
683 | if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, | |
684 | NULL)) | |
685 | goto out; | |
686 | ||
687 | vfsp->vfs_dev = mount_dev; | |
688 | vfsp->vfs_fstype = zfsfstype; | |
689 | vfsp->vfs_bsize = recordsize; | |
690 | vfsp->vfs_flag |= VFS_NOTRUNC; | |
691 | vfsp->vfs_data = zfsvfs; | |
692 | ||
693 | if (error = dsl_prop_get_integer(osname, "readonly", &readonly, NULL)) | |
694 | goto out; | |
695 | ||
696 | if (readonly) | |
697 | mode = DS_MODE_PRIMARY | DS_MODE_READONLY; | |
698 | else | |
699 | mode = DS_MODE_PRIMARY; | |
700 | ||
701 | error = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os); | |
702 | if (error == EROFS) { | |
703 | mode = DS_MODE_PRIMARY | DS_MODE_READONLY; | |
704 | error = dmu_objset_open(osname, DMU_OST_ZFS, mode, | |
705 | &zfsvfs->z_os); | |
706 | } | |
707 | ||
708 | if (error) | |
709 | goto out; | |
710 | ||
711 | if (error = zfs_init_fs(zfsvfs, &zp, cr)) | |
712 | goto out; | |
713 | ||
714 | /* The call to zfs_init_fs leaves the vnode held, release it here. */ | |
715 | VN_RELE(ZTOV(zp)); | |
716 | ||
717 | /* | |
718 | * Set features for file system. | |
719 | */ | |
720 | zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); | |
721 | if (zfsvfs->z_use_fuids) { | |
722 | vfs_set_feature(vfsp, VFSFT_XVATTR); | |
723 | vfs_set_feature(vfsp, VFSFT_ACEMASKONACCESS); | |
724 | vfs_set_feature(vfsp, VFSFT_ACLONCREATE); | |
725 | } | |
726 | if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { | |
727 | vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); | |
728 | vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); | |
729 | vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); | |
730 | } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { | |
731 | vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); | |
732 | vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); | |
733 | } | |
734 | ||
735 | if (dmu_objset_is_snapshot(zfsvfs->z_os)) { | |
736 | uint64_t pval; | |
737 | ||
738 | ASSERT(mode & DS_MODE_READONLY); | |
739 | atime_changed_cb(zfsvfs, B_FALSE); | |
740 | readonly_changed_cb(zfsvfs, B_TRUE); | |
741 | if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) | |
742 | goto out; | |
743 | xattr_changed_cb(zfsvfs, pval); | |
744 | zfsvfs->z_issnap = B_TRUE; | |
745 | } else { | |
746 | error = zfsvfs_setup(zfsvfs, B_TRUE); | |
747 | } | |
748 | ||
749 | if (!zfsvfs->z_issnap) | |
750 | zfsctl_create(zfsvfs); | |
751 | out: | |
752 | if (error) { | |
753 | if (zfsvfs->z_os) | |
754 | dmu_objset_close(zfsvfs->z_os); | |
755 | zfs_freezfsvfs(zfsvfs); | |
756 | } else { | |
757 | atomic_add_32(&zfs_active_fs_count, 1); | |
758 | } | |
759 | ||
760 | return (error); | |
761 | } | |
762 | ||
763 | void | |
764 | zfs_unregister_callbacks(zfsvfs_t *zfsvfs) | |
765 | { | |
766 | objset_t *os = zfsvfs->z_os; | |
767 | struct dsl_dataset *ds; | |
768 | ||
769 | /* | |
770 | * Unregister properties. | |
771 | */ | |
772 | if (!dmu_objset_is_snapshot(os)) { | |
773 | ds = dmu_objset_ds(os); | |
774 | VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, | |
775 | zfsvfs) == 0); | |
776 | ||
777 | VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, | |
778 | zfsvfs) == 0); | |
779 | ||
780 | VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, | |
781 | zfsvfs) == 0); | |
782 | ||
783 | VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, | |
784 | zfsvfs) == 0); | |
785 | ||
786 | VERIFY(dsl_prop_unregister(ds, "devices", devices_changed_cb, | |
787 | zfsvfs) == 0); | |
788 | ||
789 | VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, | |
790 | zfsvfs) == 0); | |
791 | ||
792 | VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, | |
793 | zfsvfs) == 0); | |
794 | ||
795 | VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, | |
796 | zfsvfs) == 0); | |
797 | ||
798 | VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, | |
799 | zfsvfs) == 0); | |
800 | ||
801 | VERIFY(dsl_prop_unregister(ds, "aclinherit", | |
802 | acl_inherit_changed_cb, zfsvfs) == 0); | |
803 | ||
804 | VERIFY(dsl_prop_unregister(ds, "vscan", | |
805 | vscan_changed_cb, zfsvfs) == 0); | |
806 | } | |
807 | } | |
808 | ||
809 | /* | |
810 | * Convert a decimal digit string to a uint64_t integer. | |
811 | */ | |
812 | static int | |
813 | str_to_uint64(char *str, uint64_t *objnum) | |
814 | { | |
815 | uint64_t num = 0; | |
816 | ||
817 | while (*str) { | |
818 | if (*str < '0' || *str > '9') | |
819 | return (EINVAL); | |
820 | ||
821 | num = num*10 + *str++ - '0'; | |
822 | } | |
823 | ||
824 | *objnum = num; | |
825 | return (0); | |
826 | } | |
827 | ||
828 | /* | |
829 | * The boot path passed from the boot loader is in the form of | |
830 | * "rootpool-name/root-filesystem-object-number'. Convert this | |
831 | * string to a dataset name: "rootpool-name/root-filesystem-name". | |
832 | */ | |
833 | static int | |
834 | zfs_parse_bootfs(char *bpath, char *outpath) | |
835 | { | |
836 | char *slashp; | |
837 | uint64_t objnum; | |
838 | int error; | |
839 | ||
840 | if (*bpath == 0 || *bpath == '/') | |
841 | return (EINVAL); | |
842 | ||
843 | slashp = strchr(bpath, '/'); | |
844 | ||
845 | /* if no '/', just return the pool name */ | |
846 | if (slashp == NULL) { | |
847 | (void) strcpy(outpath, bpath); | |
848 | return (0); | |
849 | } | |
850 | ||
851 | if (error = str_to_uint64(slashp+1, &objnum)) | |
852 | return (error); | |
853 | ||
854 | *slashp = '\0'; | |
855 | error = dsl_dsobj_to_dsname(bpath, objnum, outpath); | |
856 | *slashp = '/'; | |
857 | ||
858 | return (error); | |
859 | } | |
860 | ||
861 | static int | |
862 | zfs_mountroot(vfs_t *vfsp, enum whymountroot why) | |
863 | { | |
864 | int error = 0; | |
865 | static int zfsrootdone = 0; | |
866 | zfsvfs_t *zfsvfs = NULL; | |
867 | znode_t *zp = NULL; | |
868 | vnode_t *vp = NULL; | |
869 | char *zfs_bootfs; | |
870 | ||
871 | ASSERT(vfsp); | |
872 | ||
873 | /* | |
874 | * The filesystem that we mount as root is defined in the | |
875 | * boot property "zfs-bootfs" with a format of | |
876 | * "poolname/root-dataset-objnum". | |
877 | */ | |
878 | if (why == ROOT_INIT) { | |
879 | if (zfsrootdone++) | |
880 | return (EBUSY); | |
881 | /* | |
882 | * the process of doing a spa_load will require the | |
883 | * clock to be set before we could (for example) do | |
884 | * something better by looking at the timestamp on | |
885 | * an uberblock, so just set it to -1. | |
886 | */ | |
887 | clkset(-1); | |
888 | ||
889 | if ((zfs_bootfs = spa_get_bootfs()) == NULL) { | |
890 | cmn_err(CE_NOTE, "\nspa_get_bootfs: can not get " | |
891 | "bootfs name \n"); | |
892 | return (EINVAL); | |
893 | } | |
894 | ||
895 | if (error = spa_import_rootpool(rootfs.bo_name)) { | |
896 | spa_free_bootfs(zfs_bootfs); | |
897 | cmn_err(CE_NOTE, "\nspa_import_rootpool: error %d\n", | |
898 | error); | |
899 | return (error); | |
900 | } | |
901 | ||
902 | if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { | |
903 | spa_free_bootfs(zfs_bootfs); | |
904 | cmn_err(CE_NOTE, "\nzfs_parse_bootfs: error %d\n", | |
905 | error); | |
906 | return (error); | |
907 | } | |
908 | ||
909 | spa_free_bootfs(zfs_bootfs); | |
910 | ||
911 | if (error = vfs_lock(vfsp)) | |
912 | return (error); | |
913 | ||
914 | if (error = zfs_domount(vfsp, rootfs.bo_name, CRED())) { | |
915 | cmn_err(CE_NOTE, "\nzfs_domount: error %d\n", error); | |
916 | goto out; | |
917 | } | |
918 | ||
919 | zfsvfs = (zfsvfs_t *)vfsp->vfs_data; | |
920 | ASSERT(zfsvfs); | |
921 | if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { | |
922 | cmn_err(CE_NOTE, "\nzfs_zget: error %d\n", error); | |
923 | goto out; | |
924 | } | |
925 | ||
926 | vp = ZTOV(zp); | |
927 | mutex_enter(&vp->v_lock); | |
928 | vp->v_flag |= VROOT; | |
929 | mutex_exit(&vp->v_lock); | |
930 | rootvp = vp; | |
931 | ||
932 | /* | |
933 | * The zfs_zget call above returns with a hold on vp, we release | |
934 | * it here. | |
935 | */ | |
936 | VN_RELE(vp); | |
937 | ||
938 | vfs_add((struct vnode *)0, vfsp, | |
939 | (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); | |
940 | out: | |
941 | vfs_unlock(vfsp); | |
942 | return (error); | |
943 | } else if (why == ROOT_REMOUNT) { | |
944 | readonly_changed_cb(vfsp->vfs_data, B_FALSE); | |
945 | vfsp->vfs_flag |= VFS_REMOUNT; | |
946 | ||
947 | /* refresh mount options */ | |
948 | zfs_unregister_callbacks(vfsp->vfs_data); | |
949 | return (zfs_register_callbacks(vfsp)); | |
950 | ||
951 | } else if (why == ROOT_UNMOUNT) { | |
952 | zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); | |
953 | (void) zfs_sync(vfsp, 0, 0); | |
954 | return (0); | |
955 | } | |
956 | ||
957 | /* | |
958 | * if "why" is equal to anything else other than ROOT_INIT, | |
959 | * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. | |
960 | */ | |
961 | return (ENOTSUP); | |
962 | } | |
963 | ||
964 | /*ARGSUSED*/ | |
965 | static int | |
966 | zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr) | |
967 | { | |
968 | char *osname; | |
969 | pathname_t spn; | |
970 | int error = 0; | |
971 | uio_seg_t fromspace = (uap->flags & MS_SYSSPACE) ? | |
972 | UIO_SYSSPACE : UIO_USERSPACE; | |
973 | int canwrite; | |
974 | ||
975 | if (mvp->v_type != VDIR) | |
976 | return (ENOTDIR); | |
977 | ||
978 | mutex_enter(&mvp->v_lock); | |
979 | if ((uap->flags & MS_REMOUNT) == 0 && | |
980 | (uap->flags & MS_OVERLAY) == 0 && | |
981 | (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { | |
982 | mutex_exit(&mvp->v_lock); | |
983 | return (EBUSY); | |
984 | } | |
985 | mutex_exit(&mvp->v_lock); | |
986 | ||
987 | /* | |
988 | * ZFS does not support passing unparsed data in via MS_DATA. | |
989 | * Users should use the MS_OPTIONSTR interface; this means | |
990 | * that all option parsing is already done and the options struct | |
991 | * can be interrogated. | |
992 | */ | |
993 | if ((uap->flags & MS_DATA) && uap->datalen > 0) | |
994 | return (EINVAL); | |
995 | ||
996 | /* | |
997 | * Get the objset name (the "special" mount argument). | |
998 | */ | |
999 | if (error = pn_get(uap->spec, fromspace, &spn)) | |
1000 | return (error); | |
1001 | ||
1002 | osname = spn.pn_path; | |
1003 | ||
1004 | /* | |
1005 | * Check for mount privilege? | |
1006 | * | |
1007 | * If we don't have privilege then see if | |
1008 | * we have local permission to allow it | |
1009 | */ | |
1010 | error = secpolicy_fs_mount(cr, mvp, vfsp); | |
1011 | if (error) { | |
1012 | error = dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr); | |
1013 | if (error == 0) { | |
1014 | vattr_t vattr; | |
1015 | ||
1016 | /* | |
1017 | * Make sure user is the owner of the mount point | |
1018 | * or has sufficient privileges. | |
1019 | */ | |
1020 | ||
1021 | vattr.va_mask = AT_UID; | |
1022 | ||
1023 | if (error = VOP_GETATTR(mvp, &vattr, 0, cr, NULL)) { | |
1024 | goto out; | |
1025 | } | |
1026 | ||
1027 | if (secpolicy_vnode_owner(cr, vattr.va_uid) != 0 && | |
1028 | VOP_ACCESS(mvp, VWRITE, 0, cr, NULL) != 0) { | |
1029 | error = EPERM; | |
1030 | goto out; | |
1031 | } | |
1032 | ||
1033 | secpolicy_fs_mount_clearopts(cr, vfsp); | |
1034 | } else { | |
1035 | goto out; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Refuse to mount a filesystem if we are in a local zone and the | |
1041 | * dataset is not visible. | |
1042 | */ | |
1043 | if (!INGLOBALZONE(curproc) && | |
1044 | (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { | |
1045 | error = EPERM; | |
1046 | goto out; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * When doing a remount, we simply refresh our temporary properties | |
1051 | * according to those options set in the current VFS options. | |
1052 | */ | |
1053 | if (uap->flags & MS_REMOUNT) { | |
1054 | /* refresh mount options */ | |
1055 | zfs_unregister_callbacks(vfsp->vfs_data); | |
1056 | error = zfs_register_callbacks(vfsp); | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | error = zfs_domount(vfsp, osname, cr); | |
1061 | ||
1062 | out: | |
1063 | pn_free(&spn); | |
1064 | return (error); | |
1065 | } | |
1066 | ||
1067 | static int | |
1068 | zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp) | |
1069 | { | |
1070 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1071 | dev32_t d32; | |
1072 | uint64_t refdbytes, availbytes, usedobjs, availobjs; | |
1073 | ||
1074 | ZFS_ENTER(zfsvfs); | |
1075 | ||
1076 | dmu_objset_space(zfsvfs->z_os, | |
1077 | &refdbytes, &availbytes, &usedobjs, &availobjs); | |
1078 | ||
1079 | /* | |
1080 | * The underlying storage pool actually uses multiple block sizes. | |
1081 | * We report the fragsize as the smallest block size we support, | |
1082 | * and we report our blocksize as the filesystem's maximum blocksize. | |
1083 | */ | |
1084 | statp->f_frsize = 1UL << SPA_MINBLOCKSHIFT; | |
1085 | statp->f_bsize = zfsvfs->z_max_blksz; | |
1086 | ||
1087 | /* | |
1088 | * The following report "total" blocks of various kinds in the | |
1089 | * file system, but reported in terms of f_frsize - the | |
1090 | * "fragment" size. | |
1091 | */ | |
1092 | ||
1093 | statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; | |
1094 | statp->f_bfree = availbytes >> SPA_MINBLOCKSHIFT; | |
1095 | statp->f_bavail = statp->f_bfree; /* no root reservation */ | |
1096 | ||
1097 | /* | |
1098 | * statvfs() should really be called statufs(), because it assumes | |
1099 | * static metadata. ZFS doesn't preallocate files, so the best | |
1100 | * we can do is report the max that could possibly fit in f_files, | |
1101 | * and that minus the number actually used in f_ffree. | |
1102 | * For f_ffree, report the smaller of the number of object available | |
1103 | * and the number of blocks (each object will take at least a block). | |
1104 | */ | |
1105 | statp->f_ffree = MIN(availobjs, statp->f_bfree); | |
1106 | statp->f_favail = statp->f_ffree; /* no "root reservation" */ | |
1107 | statp->f_files = statp->f_ffree + usedobjs; | |
1108 | ||
1109 | (void) cmpldev(&d32, vfsp->vfs_dev); | |
1110 | statp->f_fsid = d32; | |
1111 | ||
1112 | /* | |
1113 | * We're a zfs filesystem. | |
1114 | */ | |
1115 | (void) strcpy(statp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name); | |
1116 | ||
1117 | statp->f_flag = vf_to_stf(vfsp->vfs_flag); | |
1118 | ||
1119 | statp->f_namemax = ZFS_MAXNAMELEN; | |
1120 | ||
1121 | /* | |
1122 | * We have all of 32 characters to stuff a string here. | |
1123 | * Is there anything useful we could/should provide? | |
1124 | */ | |
1125 | bzero(statp->f_fstr, sizeof (statp->f_fstr)); | |
1126 | ||
1127 | ZFS_EXIT(zfsvfs); | |
1128 | return (0); | |
1129 | } | |
1130 | ||
1131 | static int | |
1132 | zfs_root(vfs_t *vfsp, vnode_t **vpp) | |
1133 | { | |
1134 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1135 | znode_t *rootzp; | |
1136 | int error; | |
1137 | ||
1138 | ZFS_ENTER(zfsvfs); | |
1139 | ||
1140 | error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); | |
1141 | if (error == 0) | |
1142 | *vpp = ZTOV(rootzp); | |
1143 | ||
1144 | ZFS_EXIT(zfsvfs); | |
1145 | return (error); | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Teardown the zfsvfs::z_os. | |
1150 | * | |
1151 | * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' | |
1152 | * and 'z_teardown_inactive_lock' held. | |
1153 | */ | |
1154 | static int | |
1155 | zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) | |
1156 | { | |
1157 | znode_t *zp; | |
1158 | ||
1159 | rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); | |
1160 | ||
1161 | if (!unmounting) { | |
1162 | /* | |
1163 | * We purge the parent filesystem's vfsp as the parent | |
1164 | * filesystem and all of its snapshots have their vnode's | |
1165 | * v_vfsp set to the parent's filesystem's vfsp. Note, | |
1166 | * 'z_parent' is self referential for non-snapshots. | |
1167 | */ | |
1168 | (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Close the zil. NB: Can't close the zil while zfs_inactive | |
1173 | * threads are blocked as zil_close can call zfs_inactive. | |
1174 | */ | |
1175 | if (zfsvfs->z_log) { | |
1176 | zil_close(zfsvfs->z_log); | |
1177 | zfsvfs->z_log = NULL; | |
1178 | } | |
1179 | ||
1180 | rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); | |
1181 | ||
1182 | /* | |
1183 | * If we are not unmounting (ie: online recv) and someone already | |
1184 | * unmounted this file system while we were doing the switcheroo, | |
1185 | * or a reopen of z_os failed then just bail out now. | |
1186 | */ | |
1187 | if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { | |
1188 | rw_exit(&zfsvfs->z_teardown_inactive_lock); | |
1189 | rrw_exit(&zfsvfs->z_teardown_lock, FTAG); | |
1190 | return (EIO); | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * At this point there are no vops active, and any new vops will | |
1195 | * fail with EIO since we have z_teardown_lock for writer (only | |
1196 | * relavent for forced unmount). | |
1197 | * | |
1198 | * Release all holds on dbufs. | |
1199 | */ | |
1200 | mutex_enter(&zfsvfs->z_znodes_lock); | |
1201 | for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; | |
1202 | zp = list_next(&zfsvfs->z_all_znodes, zp)) | |
1203 | if (zp->z_dbuf) { | |
1204 | ASSERT(ZTOV(zp)->v_count > 0); | |
1205 | zfs_znode_dmu_fini(zp); | |
1206 | } | |
1207 | mutex_exit(&zfsvfs->z_znodes_lock); | |
1208 | ||
1209 | /* | |
1210 | * If we are unmounting, set the unmounted flag and let new vops | |
1211 | * unblock. zfs_inactive will have the unmounted behavior, and all | |
1212 | * other vops will fail with EIO. | |
1213 | */ | |
1214 | if (unmounting) { | |
1215 | zfsvfs->z_unmounted = B_TRUE; | |
1216 | rrw_exit(&zfsvfs->z_teardown_lock, FTAG); | |
1217 | rw_exit(&zfsvfs->z_teardown_inactive_lock); | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * z_os will be NULL if there was an error in attempting to reopen | |
1222 | * zfsvfs, so just return as the properties had already been | |
1223 | * unregistered and cached data had been evicted before. | |
1224 | */ | |
1225 | if (zfsvfs->z_os == NULL) | |
1226 | return (0); | |
1227 | ||
1228 | /* | |
1229 | * Unregister properties. | |
1230 | */ | |
1231 | zfs_unregister_callbacks(zfsvfs); | |
1232 | ||
1233 | /* | |
1234 | * Evict cached data | |
1235 | */ | |
1236 | if (dmu_objset_evict_dbufs(zfsvfs->z_os)) { | |
1237 | txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); | |
1238 | (void) dmu_objset_evict_dbufs(zfsvfs->z_os); | |
1239 | } | |
1240 | ||
1241 | return (0); | |
1242 | } | |
1243 | ||
1244 | /*ARGSUSED*/ | |
1245 | static int | |
1246 | zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr) | |
1247 | { | |
1248 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1249 | objset_t *os; | |
1250 | int ret; | |
1251 | ||
1252 | ret = secpolicy_fs_unmount(cr, vfsp); | |
1253 | if (ret) { | |
1254 | ret = dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), | |
1255 | ZFS_DELEG_PERM_MOUNT, cr); | |
1256 | if (ret) | |
1257 | return (ret); | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * We purge the parent filesystem's vfsp as the parent filesystem | |
1262 | * and all of its snapshots have their vnode's v_vfsp set to the | |
1263 | * parent's filesystem's vfsp. Note, 'z_parent' is self | |
1264 | * referential for non-snapshots. | |
1265 | */ | |
1266 | (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); | |
1267 | ||
1268 | /* | |
1269 | * Unmount any snapshots mounted under .zfs before unmounting the | |
1270 | * dataset itself. | |
1271 | */ | |
1272 | if (zfsvfs->z_ctldir != NULL && | |
1273 | (ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) { | |
1274 | return (ret); | |
1275 | } | |
1276 | ||
1277 | if (!(fflag & MS_FORCE)) { | |
1278 | /* | |
1279 | * Check the number of active vnodes in the file system. | |
1280 | * Our count is maintained in the vfs structure, but the | |
1281 | * number is off by 1 to indicate a hold on the vfs | |
1282 | * structure itself. | |
1283 | * | |
1284 | * The '.zfs' directory maintains a reference of its | |
1285 | * own, and any active references underneath are | |
1286 | * reflected in the vnode count. | |
1287 | */ | |
1288 | if (zfsvfs->z_ctldir == NULL) { | |
1289 | if (vfsp->vfs_count > 1) | |
1290 | return (EBUSY); | |
1291 | } else { | |
1292 | if (vfsp->vfs_count > 2 || | |
1293 | zfsvfs->z_ctldir->v_count > 1) | |
1294 | return (EBUSY); | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | vfsp->vfs_flag |= VFS_UNMOUNTED; | |
1299 | ||
1300 | VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); | |
1301 | os = zfsvfs->z_os; | |
1302 | ||
1303 | /* | |
1304 | * z_os will be NULL if there was an error in | |
1305 | * attempting to reopen zfsvfs. | |
1306 | */ | |
1307 | if (os != NULL) { | |
1308 | /* | |
1309 | * Unset the objset user_ptr. | |
1310 | */ | |
1311 | mutex_enter(&os->os->os_user_ptr_lock); | |
1312 | dmu_objset_set_user(os, NULL); | |
1313 | mutex_exit(&os->os->os_user_ptr_lock); | |
1314 | ||
1315 | /* | |
1316 | * Finally close the objset | |
1317 | */ | |
1318 | dmu_objset_close(os); | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * We can now safely destroy the '.zfs' directory node. | |
1323 | */ | |
1324 | if (zfsvfs->z_ctldir != NULL) | |
1325 | zfsctl_destroy(zfsvfs); | |
1326 | ||
1327 | return (0); | |
1328 | } | |
1329 | ||
1330 | static int | |
1331 | zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp) | |
1332 | { | |
1333 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1334 | znode_t *zp; | |
1335 | uint64_t object = 0; | |
1336 | uint64_t fid_gen = 0; | |
1337 | uint64_t gen_mask; | |
1338 | uint64_t zp_gen; | |
1339 | int i, err; | |
1340 | ||
1341 | *vpp = NULL; | |
1342 | ||
1343 | ZFS_ENTER(zfsvfs); | |
1344 | ||
1345 | if (fidp->fid_len == LONG_FID_LEN) { | |
1346 | zfid_long_t *zlfid = (zfid_long_t *)fidp; | |
1347 | uint64_t objsetid = 0; | |
1348 | uint64_t setgen = 0; | |
1349 | ||
1350 | for (i = 0; i < sizeof (zlfid->zf_setid); i++) | |
1351 | objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); | |
1352 | ||
1353 | for (i = 0; i < sizeof (zlfid->zf_setgen); i++) | |
1354 | setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); | |
1355 | ||
1356 | ZFS_EXIT(zfsvfs); | |
1357 | ||
1358 | err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); | |
1359 | if (err) | |
1360 | return (EINVAL); | |
1361 | ZFS_ENTER(zfsvfs); | |
1362 | } | |
1363 | ||
1364 | if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { | |
1365 | zfid_short_t *zfid = (zfid_short_t *)fidp; | |
1366 | ||
1367 | for (i = 0; i < sizeof (zfid->zf_object); i++) | |
1368 | object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); | |
1369 | ||
1370 | for (i = 0; i < sizeof (zfid->zf_gen); i++) | |
1371 | fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); | |
1372 | } else { | |
1373 | ZFS_EXIT(zfsvfs); | |
1374 | return (EINVAL); | |
1375 | } | |
1376 | ||
1377 | /* A zero fid_gen means we are in the .zfs control directories */ | |
1378 | if (fid_gen == 0 && | |
1379 | (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { | |
1380 | *vpp = zfsvfs->z_ctldir; | |
1381 | ASSERT(*vpp != NULL); | |
1382 | if (object == ZFSCTL_INO_SNAPDIR) { | |
1383 | VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, | |
1384 | 0, NULL, NULL, NULL, NULL, NULL) == 0); | |
1385 | } else { | |
1386 | VN_HOLD(*vpp); | |
1387 | } | |
1388 | ZFS_EXIT(zfsvfs); | |
1389 | return (0); | |
1390 | } | |
1391 | ||
1392 | gen_mask = -1ULL >> (64 - 8 * i); | |
1393 | ||
1394 | dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); | |
1395 | if (err = zfs_zget(zfsvfs, object, &zp)) { | |
1396 | ZFS_EXIT(zfsvfs); | |
1397 | return (err); | |
1398 | } | |
1399 | zp_gen = zp->z_phys->zp_gen & gen_mask; | |
1400 | if (zp_gen == 0) | |
1401 | zp_gen = 1; | |
1402 | if (zp->z_unlinked || zp_gen != fid_gen) { | |
1403 | dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); | |
1404 | VN_RELE(ZTOV(zp)); | |
1405 | ZFS_EXIT(zfsvfs); | |
1406 | return (EINVAL); | |
1407 | } | |
1408 | ||
1409 | *vpp = ZTOV(zp); | |
1410 | ZFS_EXIT(zfsvfs); | |
1411 | return (0); | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * Block out VOPs and close zfsvfs_t::z_os | |
1416 | * | |
1417 | * Note, if successful, then we return with the 'z_teardown_lock' and | |
1418 | * 'z_teardown_inactive_lock' write held. | |
1419 | */ | |
1420 | int | |
1421 | zfs_suspend_fs(zfsvfs_t *zfsvfs, char *name, int *mode) | |
1422 | { | |
1423 | int error; | |
1424 | ||
1425 | if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) | |
1426 | return (error); | |
1427 | ||
1428 | *mode = zfsvfs->z_os->os_mode; | |
1429 | dmu_objset_name(zfsvfs->z_os, name); | |
1430 | dmu_objset_close(zfsvfs->z_os); | |
1431 | ||
1432 | return (0); | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * Reopen zfsvfs_t::z_os and release VOPs. | |
1437 | */ | |
1438 | int | |
1439 | zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname, int mode) | |
1440 | { | |
1441 | int err; | |
1442 | ||
1443 | ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock)); | |
1444 | ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); | |
1445 | ||
1446 | err = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os); | |
1447 | if (err) { | |
1448 | zfsvfs->z_os = NULL; | |
1449 | } else { | |
1450 | znode_t *zp; | |
1451 | ||
1452 | VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); | |
1453 | ||
1454 | /* | |
1455 | * Attempt to re-establish all the active znodes with | |
1456 | * their dbufs. If a zfs_rezget() fails, then we'll let | |
1457 | * any potential callers discover that via ZFS_ENTER_VERIFY_VP | |
1458 | * when they try to use their znode. | |
1459 | */ | |
1460 | mutex_enter(&zfsvfs->z_znodes_lock); | |
1461 | for (zp = list_head(&zfsvfs->z_all_znodes); zp; | |
1462 | zp = list_next(&zfsvfs->z_all_znodes, zp)) { | |
1463 | (void) zfs_rezget(zp); | |
1464 | } | |
1465 | mutex_exit(&zfsvfs->z_znodes_lock); | |
1466 | ||
1467 | } | |
1468 | ||
1469 | /* release the VOPs */ | |
1470 | rw_exit(&zfsvfs->z_teardown_inactive_lock); | |
1471 | rrw_exit(&zfsvfs->z_teardown_lock, FTAG); | |
1472 | ||
1473 | if (err) { | |
1474 | /* | |
1475 | * Since we couldn't reopen zfsvfs::z_os, force | |
1476 | * unmount this file system. | |
1477 | */ | |
1478 | if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) | |
1479 | (void) dounmount(zfsvfs->z_vfs, MS_FORCE, CRED()); | |
1480 | } | |
1481 | return (err); | |
1482 | } | |
1483 | ||
1484 | static void | |
1485 | zfs_freevfs(vfs_t *vfsp) | |
1486 | { | |
1487 | zfsvfs_t *zfsvfs = vfsp->vfs_data; | |
1488 | int i; | |
1489 | ||
1490 | for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) | |
1491 | mutex_destroy(&zfsvfs->z_hold_mtx[i]); | |
1492 | ||
1493 | zfs_fuid_destroy(zfsvfs); | |
1494 | zfs_freezfsvfs(zfsvfs); | |
1495 | ||
1496 | atomic_add_32(&zfs_active_fs_count, -1); | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * VFS_INIT() initialization. Note that there is no VFS_FINI(), | |
1501 | * so we can't safely do any non-idempotent initialization here. | |
1502 | * Leave that to zfs_init() and zfs_fini(), which are called | |
1503 | * from the module's _init() and _fini() entry points. | |
1504 | */ | |
1505 | /*ARGSUSED*/ | |
1506 | static int | |
1507 | zfs_vfsinit(int fstype, char *name) | |
1508 | { | |
1509 | int error; | |
1510 | ||
1511 | zfsfstype = fstype; | |
1512 | ||
1513 | /* | |
1514 | * Setup vfsops and vnodeops tables. | |
1515 | */ | |
1516 | error = vfs_setfsops(fstype, zfs_vfsops_template, &zfs_vfsops); | |
1517 | if (error != 0) { | |
1518 | cmn_err(CE_WARN, "zfs: bad vfs ops template"); | |
1519 | } | |
1520 | ||
1521 | error = zfs_create_op_tables(); | |
1522 | if (error) { | |
1523 | zfs_remove_op_tables(); | |
1524 | cmn_err(CE_WARN, "zfs: bad vnode ops template"); | |
1525 | (void) vfs_freevfsops_by_type(zfsfstype); | |
1526 | return (error); | |
1527 | } | |
1528 | ||
1529 | mutex_init(&zfs_dev_mtx, NULL, MUTEX_DEFAULT, NULL); | |
1530 | ||
1531 | /* | |
1532 | * Unique major number for all zfs mounts. | |
1533 | * If we run out of 32-bit minors, we'll getudev() another major. | |
1534 | */ | |
1535 | zfs_major = ddi_name_to_major(ZFS_DRIVER); | |
1536 | zfs_minor = ZFS_MIN_MINOR; | |
1537 | ||
1538 | return (0); | |
1539 | } | |
1540 | ||
1541 | void | |
1542 | zfs_init(void) | |
1543 | { | |
1544 | /* | |
1545 | * Initialize .zfs directory structures | |
1546 | */ | |
1547 | zfsctl_init(); | |
1548 | ||
1549 | /* | |
1550 | * Initialize znode cache, vnode ops, etc... | |
1551 | */ | |
1552 | zfs_znode_init(); | |
1553 | } | |
1554 | ||
1555 | void | |
1556 | zfs_fini(void) | |
1557 | { | |
1558 | zfsctl_fini(); | |
1559 | zfs_znode_fini(); | |
1560 | } | |
1561 | ||
1562 | int | |
1563 | zfs_busy(void) | |
1564 | { | |
1565 | return (zfs_active_fs_count != 0); | |
1566 | } | |
1567 | ||
1568 | int | |
1569 | zfs_set_version(const char *name, uint64_t newvers) | |
1570 | { | |
1571 | int error; | |
1572 | objset_t *os; | |
1573 | dmu_tx_t *tx; | |
1574 | uint64_t curvers; | |
1575 | ||
1576 | /* | |
1577 | * XXX for now, require that the filesystem be unmounted. Would | |
1578 | * be nice to find the zfsvfs_t and just update that if | |
1579 | * possible. | |
1580 | */ | |
1581 | ||
1582 | if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) | |
1583 | return (EINVAL); | |
1584 | ||
1585 | error = dmu_objset_open(name, DMU_OST_ZFS, DS_MODE_PRIMARY, &os); | |
1586 | if (error) | |
1587 | return (error); | |
1588 | ||
1589 | error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, | |
1590 | 8, 1, &curvers); | |
1591 | if (error) | |
1592 | goto out; | |
1593 | if (newvers < curvers) { | |
1594 | error = EINVAL; | |
1595 | goto out; | |
1596 | } | |
1597 | ||
1598 | tx = dmu_tx_create(os); | |
1599 | dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, 0, ZPL_VERSION_STR); | |
1600 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1601 | if (error) { | |
1602 | dmu_tx_abort(tx); | |
1603 | goto out; | |
1604 | } | |
1605 | error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 8, 1, | |
1606 | &newvers, tx); | |
1607 | ||
1608 | spa_history_internal_log(LOG_DS_UPGRADE, | |
1609 | dmu_objset_spa(os), tx, CRED(), | |
1610 | "oldver=%llu newver=%llu dataset = %llu", curvers, newvers, | |
1611 | dmu_objset_id(os)); | |
1612 | dmu_tx_commit(tx); | |
1613 | ||
1614 | out: | |
1615 | dmu_objset_close(os); | |
1616 | return (error); | |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * Read a property stored within the master node. | |
1621 | */ | |
1622 | int | |
1623 | zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) | |
1624 | { | |
1625 | const char *pname; | |
1626 | int error; | |
1627 | ||
1628 | /* | |
1629 | * Look up the file system's value for the property. For the | |
1630 | * version property, we look up a slightly different string. | |
1631 | */ | |
1632 | if (prop == ZFS_PROP_VERSION) | |
1633 | pname = ZPL_VERSION_STR; | |
1634 | else | |
1635 | pname = zfs_prop_to_name(prop); | |
1636 | ||
1637 | error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); | |
1638 | ||
1639 | if (error == ENOENT) { | |
1640 | /* No value set, use the default value */ | |
1641 | switch (prop) { | |
1642 | case ZFS_PROP_VERSION: | |
1643 | *value = ZPL_VERSION; | |
1644 | break; | |
1645 | case ZFS_PROP_NORMALIZE: | |
1646 | case ZFS_PROP_UTF8ONLY: | |
1647 | *value = 0; | |
1648 | break; | |
1649 | case ZFS_PROP_CASE: | |
1650 | *value = ZFS_CASE_SENSITIVE; | |
1651 | break; | |
1652 | default: | |
1653 | return (error); | |
1654 | } | |
1655 | error = 0; | |
1656 | } | |
1657 | return (error); | |
1658 | } | |
1659 | ||
1660 | static vfsdef_t vfw = { | |
1661 | VFSDEF_VERSION, | |
1662 | MNTTYPE_ZFS, | |
1663 | zfs_vfsinit, | |
1664 | VSW_HASPROTO|VSW_CANRWRO|VSW_CANREMOUNT|VSW_VOLATILEDEV|VSW_STATS| | |
1665 | VSW_XID, | |
1666 | &zfs_mntopts | |
1667 | }; | |
1668 | ||
1669 | struct modlfs zfs_modlfs = { | |
1670 | &mod_fsops, "ZFS filesystem version " SPA_VERSION_STRING, &vfw | |
1671 | }; |