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) 2012, 2014 by Delphix. All rights reserved.
24 */
25
26 /* Portions Copyright 2007 Jeremy Teo */
27
28 #ifdef _KERNEL
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/time.h>
32 #include <sys/systm.h>
33 #include <sys/sysmacros.h>
34 #include <sys/resource.h>
35 #include <sys/mntent.h>
36 #include <sys/mkdev.h>
37 #include <sys/u8_textprep.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/vfs.h>
40 #include <sys/vfs_opreg.h>
41 #include <sys/vnode.h>
42 #include <sys/file.h>
43 #include <sys/kmem.h>
44 #include <sys/errno.h>
45 #include <sys/unistd.h>
46 #include <sys/mode.h>
47 #include <sys/atomic.h>
48 #include <vm/pvn.h>
49 #include "fs/fs_subr.h"
50 #include <sys/zfs_dir.h>
51 #include <sys/zfs_acl.h>
52 #include <sys/zfs_ioctl.h>
53 #include <sys/zfs_rlock.h>
54 #include <sys/zfs_fuid.h>
55 #include <sys/dnode.h>
56 #include <sys/fs/zfs.h>
57 #include <sys/kidmap.h>
58 #endif /* _KERNEL */
59
60 #include <sys/dmu.h>
61 #include <sys/dmu_objset.h>
62 #include <sys/refcount.h>
63 #include <sys/stat.h>
64 #include <sys/zap.h>
65 #include <sys/zfs_znode.h>
66 #include <sys/sa.h>
67 #include <sys/zfs_sa.h>
68 #include <sys/zfs_stat.h>
69 #include <sys/zfs_events.h>
70 #include <zev/zev.h>
71
72 #include "zfs_prop.h"
73 #include "zfs_comutil.h"
74
75 /*
76 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only
77 * turned on when DEBUG is also defined.
78 */
79 #ifdef DEBUG
80 #define ZNODE_STATS
81 #endif /* DEBUG */
82
83 #ifdef ZNODE_STATS
84 #define ZNODE_STAT_ADD(stat) ((stat)++)
85 #else
86 #define ZNODE_STAT_ADD(stat) /* nothing */
87 #endif /* ZNODE_STATS */
88
89 /*
90 * Functions needed for userland (ie: libzpool) are not put under
91 * #ifdef_KERNEL; the rest of the functions have dependencies
92 * (such as VFS logic) that will not compile easily in userland.
93 */
94 #ifdef _KERNEL
95 /*
96 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to
97 * be freed before it can be safely accessed.
98 */
99 krwlock_t zfsvfs_lock;
100
101 static kmem_cache_t *znode_cache = NULL;
102
103 /*ARGSUSED*/
104 static void
znode_evict_error(dmu_buf_t * dbuf,void * user_ptr)105 znode_evict_error(dmu_buf_t *dbuf, void *user_ptr)
106 {
107 /*
108 * We should never drop all dbuf refs without first clearing
109 * the eviction callback.
110 */
111 panic("evicting znode %p\n", user_ptr);
112 }
113
114 /*ARGSUSED*/
115 static int
zfs_znode_cache_constructor(void * buf,void * arg,int kmflags)116 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
117 {
118 znode_t *zp = buf;
119
120 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
121
122 zp->z_vnode = vn_alloc(kmflags);
123 if (zp->z_vnode == NULL) {
124 return (-1);
125 }
126 ZTOV(zp)->v_data = zp;
127
128 list_link_init(&zp->z_link_node);
129
130 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
131 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
132 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
133 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
134
135 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
136 avl_create(&zp->z_range_avl, zfs_range_compare,
137 sizeof (rl_t), offsetof(rl_t, r_node));
138
139 zp->z_dirlocks = NULL;
140 zp->z_acl_cached = NULL;
141 zp->z_moved = 0;
142 return (0);
143 }
144
145 /*ARGSUSED*/
146 static void
zfs_znode_cache_destructor(void * buf,void * arg)147 zfs_znode_cache_destructor(void *buf, void *arg)
148 {
149 znode_t *zp = buf;
150
151 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
152 ASSERT(ZTOV(zp)->v_data == zp);
153 vn_free(ZTOV(zp));
154 ASSERT(!list_link_active(&zp->z_link_node));
155 mutex_destroy(&zp->z_lock);
156 rw_destroy(&zp->z_parent_lock);
157 rw_destroy(&zp->z_name_lock);
158 mutex_destroy(&zp->z_acl_lock);
159 avl_destroy(&zp->z_range_avl);
160 mutex_destroy(&zp->z_range_lock);
161
162 ASSERT(zp->z_dirlocks == NULL);
163 ASSERT(zp->z_acl_cached == NULL);
164 }
165
166 #ifdef ZNODE_STATS
167 static struct {
168 uint64_t zms_zfsvfs_invalid;
169 uint64_t zms_zfsvfs_recheck1;
170 uint64_t zms_zfsvfs_unmounted;
171 uint64_t zms_zfsvfs_recheck2;
172 uint64_t zms_obj_held;
173 uint64_t zms_vnode_locked;
174 uint64_t zms_not_only_dnlc;
175 } znode_move_stats;
176 #endif /* ZNODE_STATS */
177
178 static void
zfs_znode_move_impl(znode_t * ozp,znode_t * nzp)179 zfs_znode_move_impl(znode_t *ozp, znode_t *nzp)
180 {
181 vnode_t *vp;
182
183 /* Copy fields. */
184 nzp->z_zfsvfs = ozp->z_zfsvfs;
185
186 /* Swap vnodes. */
187 vp = nzp->z_vnode;
188 nzp->z_vnode = ozp->z_vnode;
189 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */
190 ZTOV(ozp)->v_data = ozp;
191 ZTOV(nzp)->v_data = nzp;
192
193 nzp->z_id = ozp->z_id;
194 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */
195 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0);
196 nzp->z_unlinked = ozp->z_unlinked;
197 nzp->z_atime_dirty = ozp->z_atime_dirty;
198 nzp->z_zn_prefetch = ozp->z_zn_prefetch;
199 nzp->z_blksz = ozp->z_blksz;
200 nzp->z_seq = ozp->z_seq;
201 nzp->z_mapcnt = ozp->z_mapcnt;
202 nzp->z_gen = ozp->z_gen;
203 nzp->z_sync_cnt = ozp->z_sync_cnt;
204 nzp->z_is_sa = ozp->z_is_sa;
205 nzp->z_sa_hdl = ozp->z_sa_hdl;
206 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2);
207 nzp->z_links = ozp->z_links;
208 nzp->z_size = ozp->z_size;
209 nzp->z_pflags = ozp->z_pflags;
210 nzp->z_uid = ozp->z_uid;
211 nzp->z_gid = ozp->z_gid;
212 nzp->z_mode = ozp->z_mode;
213 nzp->z_new_content = ozp->z_new_content;
214
215 /*
216 * Since this is just an idle znode and kmem is already dealing with
217 * memory pressure, release any cached ACL.
218 */
219 if (ozp->z_acl_cached) {
220 zfs_acl_free(ozp->z_acl_cached);
221 ozp->z_acl_cached = NULL;
222 }
223
224 sa_set_userp(nzp->z_sa_hdl, nzp);
225
226 /*
227 * Invalidate the original znode by clearing fields that provide a
228 * pointer back to the znode. Set the low bit of the vfs pointer to
229 * ensure that zfs_znode_move() recognizes the znode as invalid in any
230 * subsequent callback.
231 */
232 ozp->z_sa_hdl = NULL;
233 POINTER_INVALIDATE(&ozp->z_zfsvfs);
234
235 /*
236 * Mark the znode.
237 */
238 nzp->z_moved = 1;
239 ozp->z_moved = (uint8_t)-1;
240 }
241
242 /*ARGSUSED*/
243 static kmem_cbrc_t
zfs_znode_move(void * buf,void * newbuf,size_t size,void * arg)244 zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg)
245 {
246 znode_t *ozp = buf, *nzp = newbuf;
247 zfsvfs_t *zfsvfs;
248 vnode_t *vp;
249
250 /*
251 * The znode is on the file system's list of known znodes if the vfs
252 * pointer is valid. We set the low bit of the vfs pointer when freeing
253 * the znode to invalidate it, and the memory patterns written by kmem
254 * (baddcafe and deadbeef) set at least one of the two low bits. A newly
255 * created znode sets the vfs pointer last of all to indicate that the
256 * znode is known and in a valid state to be moved by this function.
257 */
258 zfsvfs = ozp->z_zfsvfs;
259 if (!POINTER_IS_VALID(zfsvfs)) {
260 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid);
261 return (KMEM_CBRC_DONT_KNOW);
262 }
263
264 /*
265 * Close a small window in which it's possible that the filesystem could
266 * be unmounted and freed, and zfsvfs, though valid in the previous
267 * statement, could point to unrelated memory by the time we try to
268 * prevent the filesystem from being unmounted.
269 */
270 rw_enter(&zfsvfs_lock, RW_WRITER);
271 if (zfsvfs != ozp->z_zfsvfs) {
272 rw_exit(&zfsvfs_lock);
273 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1);
274 return (KMEM_CBRC_DONT_KNOW);
275 }
276
277 /*
278 * If the znode is still valid, then so is the file system. We know that
279 * no valid file system can be freed while we hold zfsvfs_lock, so we
280 * can safely ensure that the filesystem is not and will not be
281 * unmounted. The next statement is equivalent to ZFS_ENTER().
282 */
283 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG);
284 if (zfsvfs->z_unmounted) {
285 ZFS_EXIT(zfsvfs);
286 rw_exit(&zfsvfs_lock);
287 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted);
288 return (KMEM_CBRC_DONT_KNOW);
289 }
290 rw_exit(&zfsvfs_lock);
291
292 mutex_enter(&zfsvfs->z_znodes_lock);
293 /*
294 * Recheck the vfs pointer in case the znode was removed just before
295 * acquiring the lock.
296 */
297 if (zfsvfs != ozp->z_zfsvfs) {
298 mutex_exit(&zfsvfs->z_znodes_lock);
299 ZFS_EXIT(zfsvfs);
300 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2);
301 return (KMEM_CBRC_DONT_KNOW);
302 }
303
304 /*
305 * At this point we know that as long as we hold z_znodes_lock, the
306 * znode cannot be freed and fields within the znode can be safely
307 * accessed. Now, prevent a race with zfs_zget().
308 */
309 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) {
310 mutex_exit(&zfsvfs->z_znodes_lock);
311 ZFS_EXIT(zfsvfs);
312 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held);
313 return (KMEM_CBRC_LATER);
314 }
315
316 vp = ZTOV(ozp);
317 if (mutex_tryenter(&vp->v_lock) == 0) {
318 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
319 mutex_exit(&zfsvfs->z_znodes_lock);
320 ZFS_EXIT(zfsvfs);
321 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked);
322 return (KMEM_CBRC_LATER);
323 }
324
325 /* Only move znodes that are referenced _only_ by the DNLC. */
326 if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
327 mutex_exit(&vp->v_lock);
328 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
329 mutex_exit(&zfsvfs->z_znodes_lock);
330 ZFS_EXIT(zfsvfs);
331 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc);
332 return (KMEM_CBRC_LATER);
333 }
334
335 /*
336 * The znode is known and in a valid state to move. We're holding the
337 * locks needed to execute the critical section.
338 */
339 zfs_znode_move_impl(ozp, nzp);
340 mutex_exit(&vp->v_lock);
341 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
342
343 list_link_replace(&ozp->z_link_node, &nzp->z_link_node);
344 mutex_exit(&zfsvfs->z_znodes_lock);
345 ZFS_EXIT(zfsvfs);
346
347 return (KMEM_CBRC_YES);
348 }
349
350 void
zfs_znode_init(void)351 zfs_znode_init(void)
352 {
353 /*
354 * Initialize zcache
355 */
356 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
357 ASSERT(znode_cache == NULL);
358 znode_cache = kmem_cache_create("zfs_znode_cache",
359 sizeof (znode_t), 0, zfs_znode_cache_constructor,
360 zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
361 kmem_cache_set_move(znode_cache, zfs_znode_move);
362 }
363
364 void
zfs_znode_fini(void)365 zfs_znode_fini(void)
366 {
367 /*
368 * Cleanup vfs & vnode ops
369 */
370 zfs_remove_op_tables();
371
372 /*
373 * Cleanup zcache
374 */
375 if (znode_cache)
376 kmem_cache_destroy(znode_cache);
377 znode_cache = NULL;
378 rw_destroy(&zfsvfs_lock);
379 }
380
381 struct vnodeops *zfs_dvnodeops;
382 struct vnodeops *zfs_fvnodeops;
383 struct vnodeops *zfs_symvnodeops;
384 struct vnodeops *zfs_xdvnodeops;
385 struct vnodeops *zfs_evnodeops;
386 struct vnodeops *zfs_sharevnodeops;
387
388 void
zfs_remove_op_tables()389 zfs_remove_op_tables()
390 {
391 /*
392 * Remove vfs ops
393 */
394 ASSERT(zfsfstype);
395 (void) vfs_freevfsops_by_type(zfsfstype);
396 zfsfstype = 0;
397
398 /*
399 * Remove vnode ops
400 */
401 if (zfs_dvnodeops)
402 vn_freevnodeops(zfs_dvnodeops);
403 if (zfs_fvnodeops)
404 vn_freevnodeops(zfs_fvnodeops);
405 if (zfs_symvnodeops)
406 vn_freevnodeops(zfs_symvnodeops);
407 if (zfs_xdvnodeops)
408 vn_freevnodeops(zfs_xdvnodeops);
409 if (zfs_evnodeops)
410 vn_freevnodeops(zfs_evnodeops);
411 if (zfs_sharevnodeops)
412 vn_freevnodeops(zfs_sharevnodeops);
413
414 zfs_dvnodeops = NULL;
415 zfs_fvnodeops = NULL;
416 zfs_symvnodeops = NULL;
417 zfs_xdvnodeops = NULL;
418 zfs_evnodeops = NULL;
419 zfs_sharevnodeops = NULL;
420 }
421
422 extern const fs_operation_def_t zfs_dvnodeops_template[];
423 extern const fs_operation_def_t zfs_fvnodeops_template[];
424 extern const fs_operation_def_t zfs_xdvnodeops_template[];
425 extern const fs_operation_def_t zfs_symvnodeops_template[];
426 extern const fs_operation_def_t zfs_evnodeops_template[];
427 extern const fs_operation_def_t zfs_sharevnodeops_template[];
428
429 int
zfs_create_op_tables()430 zfs_create_op_tables()
431 {
432 int error;
433
434 /*
435 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs()
436 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv).
437 * In this case we just return as the ops vectors are already set up.
438 */
439 if (zfs_dvnodeops)
440 return (0);
441
442 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template,
443 &zfs_dvnodeops);
444 if (error)
445 return (error);
446
447 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template,
448 &zfs_fvnodeops);
449 if (error)
450 return (error);
451
452 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template,
453 &zfs_symvnodeops);
454 if (error)
455 return (error);
456
457 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template,
458 &zfs_xdvnodeops);
459 if (error)
460 return (error);
461
462 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template,
463 &zfs_evnodeops);
464 if (error)
465 return (error);
466
467 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template,
468 &zfs_sharevnodeops);
469
470 return (error);
471 }
472
473 int
zfs_create_share_dir(zfsvfs_t * zfsvfs,dmu_tx_t * tx)474 zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
475 {
476 zfs_acl_ids_t acl_ids;
477 vattr_t vattr;
478 znode_t *sharezp;
479 vnode_t *vp;
480 znode_t *zp;
481 int error;
482
483 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
484 vattr.va_type = VDIR;
485 vattr.va_mode = S_IFDIR|0555;
486 vattr.va_uid = crgetuid(kcred);
487 vattr.va_gid = crgetgid(kcred);
488
489 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
490 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
491 sharezp->z_moved = 0;
492 sharezp->z_unlinked = 0;
493 sharezp->z_atime_dirty = 0;
494 sharezp->z_zfsvfs = zfsvfs;
495 sharezp->z_is_sa = zfsvfs->z_use_sa;
496
497 vp = ZTOV(sharezp);
498 vn_reinit(vp);
499 vp->v_type = VDIR;
500
501 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
502 kcred, NULL, &acl_ids));
503 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
504 ASSERT3P(zp, ==, sharezp);
505 ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
506 POINTER_INVALIDATE(&sharezp->z_zfsvfs);
507 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
508 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
509 zfsvfs->z_shares_dir = sharezp->z_id;
510
511 zfs_acl_ids_free(&acl_ids);
512 ZTOV(sharezp)->v_count = 0;
513 sa_handle_destroy(sharezp->z_sa_hdl);
514 kmem_cache_free(znode_cache, sharezp);
515
516 return (error);
517 }
518
519 /*
520 * define a couple of values we need available
521 * for both 64 and 32 bit environments.
522 */
523 #ifndef NBITSMINOR64
524 #define NBITSMINOR64 32
525 #endif
526 #ifndef MAXMAJ64
527 #define MAXMAJ64 0xffffffffUL
528 #endif
529 #ifndef MAXMIN64
530 #define MAXMIN64 0xffffffffUL
531 #endif
532
533 /*
534 * Create special expldev for ZFS private use.
535 * Can't use standard expldev since it doesn't do
536 * what we want. The standard expldev() takes a
537 * dev32_t in LP64 and expands it to a long dev_t.
538 * We need an interface that takes a dev32_t in ILP32
539 * and expands it to a long dev_t.
540 */
541 static uint64_t
zfs_expldev(dev_t dev)542 zfs_expldev(dev_t dev)
543 {
544 #ifndef _LP64
545 major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32;
546 return (((uint64_t)major << NBITSMINOR64) |
547 ((minor_t)dev & MAXMIN32));
548 #else
549 return (dev);
550 #endif
551 }
552
553 /*
554 * Special cmpldev for ZFS private use.
555 * Can't use standard cmpldev since it takes
556 * a long dev_t and compresses it to dev32_t in
557 * LP64. We need to do a compaction of a long dev_t
558 * to a dev32_t in ILP32.
559 */
560 dev_t
zfs_cmpldev(uint64_t dev)561 zfs_cmpldev(uint64_t dev)
562 {
563 #ifndef _LP64
564 minor_t minor = (minor_t)dev & MAXMIN64;
565 major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64;
566
567 if (major > MAXMAJ32 || minor > MAXMIN32)
568 return (NODEV32);
569
570 return (((dev32_t)major << NBITSMINOR32) | minor);
571 #else
572 return (dev);
573 #endif
574 }
575
576 static void
zfs_znode_sa_init(zfsvfs_t * zfsvfs,znode_t * zp,dmu_buf_t * db,dmu_object_type_t obj_type,sa_handle_t * sa_hdl)577 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
578 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
579 {
580 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs));
581 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));
582
583 mutex_enter(&zp->z_lock);
584
585 ASSERT(zp->z_sa_hdl == NULL);
586 ASSERT(zp->z_acl_cached == NULL);
587 if (sa_hdl == NULL) {
588 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
589 SA_HDL_SHARED, &zp->z_sa_hdl));
590 } else {
591 zp->z_sa_hdl = sa_hdl;
592 sa_set_userp(sa_hdl, zp);
593 }
594
595 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
596
597 /*
598 * Slap on VROOT if we are the root znode
599 */
600 if (zp->z_id == zfsvfs->z_root)
601 ZTOV(zp)->v_flag |= VROOT;
602
603 mutex_exit(&zp->z_lock);
604 vn_exists(ZTOV(zp));
605 }
606
607 void
zfs_znode_dmu_fini(znode_t * zp)608 zfs_znode_dmu_fini(znode_t *zp)
609 {
610 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) ||
611 zp->z_unlinked ||
612 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock));
613
614 sa_handle_destroy(zp->z_sa_hdl);
615 zp->z_sa_hdl = NULL;
616 }
617
618 /*
619 * Construct a new znode/vnode and intialize.
620 *
621 * This does not do a call to dmu_set_user() that is
622 * up to the caller to do, in case you don't want to
623 * return the znode
624 */
625 static znode_t *
zfs_znode_alloc(zfsvfs_t * zfsvfs,dmu_buf_t * db,int blksz,dmu_object_type_t obj_type,sa_handle_t * hdl)626 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
627 dmu_object_type_t obj_type, sa_handle_t *hdl)
628 {
629 znode_t *zp;
630 vnode_t *vp;
631 uint64_t mode;
632 uint64_t parent;
633 sa_bulk_attr_t bulk[9];
634 int count = 0;
635
636 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
637
638 ASSERT(zp->z_dirlocks == NULL);
639 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
640 zp->z_moved = 0;
641
642 /*
643 * Defer setting z_zfsvfs until the znode is ready to be a candidate for
644 * the zfs_znode_move() callback.
645 */
646 zp->z_sa_hdl = NULL;
647 zp->z_unlinked = 0;
648 zp->z_atime_dirty = 0;
649 zp->z_mapcnt = 0;
650 zp->z_id = db->db_object;
651 zp->z_blksz = blksz;
652 zp->z_seq = 0x7A4653;
653 zp->z_sync_cnt = 0;
654 zp->z_new_content = 0;
655
656 vp = ZTOV(zp);
657 vn_reinit(vp);
658
659 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
660
661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
662 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
663 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
664 &zp->z_size, 8);
665 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
666 &zp->z_links, 8);
667 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
668 &zp->z_pflags, 8);
669 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
670 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
671 &zp->z_atime, 16);
672 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
673 &zp->z_uid, 8);
674 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
675 &zp->z_gid, 8);
676
677 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
678 if (hdl == NULL)
679 sa_handle_destroy(zp->z_sa_hdl);
680 kmem_cache_free(znode_cache, zp);
681 return (NULL);
682 }
683
684 zp->z_mode = mode;
685 vp->v_vfsp = zfsvfs->z_parent->z_vfs;
686
687 vp->v_type = IFTOVT((mode_t)mode);
688
689 switch (vp->v_type) {
690 case VDIR:
691 if (zp->z_pflags & ZFS_XATTR) {
692 vn_setops(vp, zfs_xdvnodeops);
693 vp->v_flag |= V_XATTRDIR;
694 } else {
695 vn_setops(vp, zfs_dvnodeops);
696 }
697 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
698 break;
699 case VBLK:
700 case VCHR:
701 {
702 uint64_t rdev;
703 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
704 &rdev, sizeof (rdev)) == 0);
705
706 vp->v_rdev = zfs_cmpldev(rdev);
707 }
708 /*FALLTHROUGH*/
709 case VFIFO:
710 case VSOCK:
711 case VDOOR:
712 vn_setops(vp, zfs_fvnodeops);
713 break;
714 case VREG:
715 vp->v_flag |= VMODSORT;
716 if (parent == zfsvfs->z_shares_dir) {
717 ASSERT(zp->z_uid == 0 && zp->z_gid == 0);
718 vn_setops(vp, zfs_sharevnodeops);
719 } else {
720 vn_setops(vp, zfs_fvnodeops);
721 }
722 break;
723 case VLNK:
724 vn_setops(vp, zfs_symvnodeops);
725 break;
726 default:
727 vn_setops(vp, zfs_evnodeops);
728 break;
729 }
730
731 mutex_enter(&zfsvfs->z_znodes_lock);
732 list_insert_tail(&zfsvfs->z_all_znodes, zp);
733 membar_producer();
734 /*
735 * Everything else must be valid before assigning z_zfsvfs makes the
736 * znode eligible for zfs_znode_move().
737 */
738 zp->z_zfsvfs = zfsvfs;
739 mutex_exit(&zfsvfs->z_znodes_lock);
740
741 VFS_HOLD(zfsvfs->z_vfs);
742 return (zp);
743 }
744
745 static uint64_t empty_xattr;
746 static uint64_t pad[4];
747 static zfs_acl_phys_t acl_phys;
748 /*
749 * Create a new DMU object to hold a zfs znode.
750 *
751 * IN: dzp - parent directory for new znode
752 * vap - file attributes for new znode
753 * tx - dmu transaction id for zap operations
754 * cr - credentials of caller
755 * flag - flags:
756 * IS_ROOT_NODE - new object will be root
757 * IS_XATTR - new object is an attribute
758 * bonuslen - length of bonus buffer
759 * setaclp - File/Dir initial ACL
760 * fuidp - Tracks fuid allocation.
761 *
762 * OUT: zpp - allocated znode
763 *
764 */
765 void
zfs_mknode(znode_t * dzp,vattr_t * vap,dmu_tx_t * tx,cred_t * cr,uint_t flag,znode_t ** zpp,zfs_acl_ids_t * acl_ids)766 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
767 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
768 {
769 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
770 uint64_t mode, size, links, parent, pflags;
771 uint64_t dzp_pflags = 0;
772 uint64_t rdev = 0;
773 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
774 dmu_buf_t *db;
775 timestruc_t now;
776 uint64_t gen, obj;
777 int bonuslen;
778 sa_handle_t *sa_hdl;
779 dmu_object_type_t obj_type;
780 sa_bulk_attr_t sa_attrs[ZPL_END];
781 int cnt = 0;
782 zfs_acl_locator_cb_t locate = { 0 };
783
784 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
785
786 if (zfsvfs->z_replay) {
787 obj = vap->va_nodeid;
788 now = vap->va_ctime; /* see zfs_replay_create() */
789 gen = vap->va_nblocks; /* ditto */
790 } else {
791 obj = 0;
792 gethrestime(&now);
793 gen = dmu_tx_get_txg(tx);
794 }
795
796 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
797 bonuslen = (obj_type == DMU_OT_SA) ?
798 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
799
800 /*
801 * Create a new DMU object.
802 */
803 /*
804 * There's currently no mechanism for pre-reading the blocks that will
805 * be needed to allocate a new object, so we accept the small chance
806 * that there will be an i/o error and we will fail one of the
807 * assertions below.
808 */
809 if (vap->va_type == VDIR) {
810 if (zfsvfs->z_replay) {
811 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj,
812 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
813 obj_type, bonuslen, tx));
814 } else {
815 obj = zap_create_norm(zfsvfs->z_os,
816 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
817 obj_type, bonuslen, tx);
818 }
819 } else {
820 if (zfsvfs->z_replay) {
821 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj,
822 DMU_OT_PLAIN_FILE_CONTENTS, 0,
823 obj_type, bonuslen, tx));
824 } else {
825 obj = dmu_object_alloc(zfsvfs->z_os,
826 DMU_OT_PLAIN_FILE_CONTENTS, 0,
827 obj_type, bonuslen, tx);
828 }
829 }
830
831 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
832 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
833
834 /*
835 * If this is the root, fix up the half-initialized parent pointer
836 * to reference the just-allocated physical data area.
837 */
838 if (flag & IS_ROOT_NODE) {
839 dzp->z_id = obj;
840 } else {
841 dzp_pflags = dzp->z_pflags;
842 }
843
844 /*
845 * If parent is an xattr, so am I.
846 */
847 if (dzp_pflags & ZFS_XATTR) {
848 flag |= IS_XATTR;
849 }
850
851 if (zfsvfs->z_use_fuids)
852 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
853 else
854 pflags = 0;
855
856 if (vap->va_type == VDIR) {
857 size = 2; /* contents ("." and "..") */
858 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
859 } else {
860 size = links = 0;
861 }
862
863 if (vap->va_type == VBLK || vap->va_type == VCHR) {
864 rdev = zfs_expldev(vap->va_rdev);
865 }
866
867 parent = dzp->z_id;
868 mode = acl_ids->z_mode;
869 if (flag & IS_XATTR)
870 pflags |= ZFS_XATTR;
871
872 /*
873 * No execs denied will be deterimed when zfs_mode_compute() is called.
874 */
875 pflags |= acl_ids->z_aclp->z_hints &
876 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
877 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
878
879 ZFS_TIME_ENCODE(&now, crtime);
880 ZFS_TIME_ENCODE(&now, ctime);
881
882 if (vap->va_mask & AT_ATIME) {
883 ZFS_TIME_ENCODE(&vap->va_atime, atime);
884 } else {
885 ZFS_TIME_ENCODE(&now, atime);
886 }
887
888 if (vap->va_mask & AT_MTIME) {
889 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
890 } else {
891 ZFS_TIME_ENCODE(&now, mtime);
892 }
893
894 /* Now add in all of the "SA" attributes */
895 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
896 &sa_hdl));
897
898 /*
899 * Setup the array of attributes to be replaced/set on the new file
900 *
901 * order for DMU_OT_ZNODE is critical since it needs to be constructed
902 * in the old znode_phys_t format. Don't change this ordering
903 */
904
905 if (obj_type == DMU_OT_ZNODE) {
906 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
907 NULL, &atime, 16);
908 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
909 NULL, &mtime, 16);
910 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
911 NULL, &ctime, 16);
912 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
913 NULL, &crtime, 16);
914 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
915 NULL, &gen, 8);
916 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
917 NULL, &mode, 8);
918 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
919 NULL, &size, 8);
920 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
921 NULL, &parent, 8);
922 } else {
923 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
924 NULL, &mode, 8);
925 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
926 NULL, &size, 8);
927 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
928 NULL, &gen, 8);
929 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
930 &acl_ids->z_fuid, 8);
931 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
932 &acl_ids->z_fgid, 8);
933 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
934 NULL, &parent, 8);
935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
936 NULL, &pflags, 8);
937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
938 NULL, &atime, 16);
939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
940 NULL, &mtime, 16);
941 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
942 NULL, &ctime, 16);
943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
944 NULL, &crtime, 16);
945 }
946
947 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
948
949 if (obj_type == DMU_OT_ZNODE) {
950 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
951 &empty_xattr, 8);
952 }
953 if (obj_type == DMU_OT_ZNODE ||
954 (vap->va_type == VBLK || vap->va_type == VCHR)) {
955 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
956 NULL, &rdev, 8);
957
958 }
959 if (obj_type == DMU_OT_ZNODE) {
960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
961 NULL, &pflags, 8);
962 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
963 &acl_ids->z_fuid, 8);
964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
965 &acl_ids->z_fgid, 8);
966 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
967 sizeof (uint64_t) * 4);
968 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
969 &acl_phys, sizeof (zfs_acl_phys_t));
970 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
971 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
972 &acl_ids->z_aclp->z_acl_count, 8);
973 locate.cb_aclp = acl_ids->z_aclp;
974 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
975 zfs_acl_data_locator, &locate,
976 acl_ids->z_aclp->z_acl_bytes);
977 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
978 acl_ids->z_fuid, acl_ids->z_fgid);
979 }
980
981 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
982
983 if (!(flag & IS_ROOT_NODE)) {
984 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
985 ASSERT(*zpp != NULL);
986 } else {
987 /*
988 * If we are creating the root node, the "parent" we
989 * passed in is the znode for the root.
990 */
991 *zpp = dzp;
992
993 (*zpp)->z_sa_hdl = sa_hdl;
994 }
995
996 (*zpp)->z_pflags = pflags;
997 (*zpp)->z_mode = mode;
998
999 if (vap->va_mask & AT_XVATTR)
1000 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx);
1001
1002 if (obj_type == DMU_OT_ZNODE ||
1003 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
1004 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
1005 }
1006 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1007 }
1008
1009 /*
1010 * Update in-core attributes. It is assumed the caller will be doing an
1011 * sa_bulk_update to push the changes out.
1012 */
1013 void
zfs_xvattr_set(znode_t * zp,xvattr_t * xvap,dmu_tx_t * tx)1014 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
1015 {
1016 xoptattr_t *xoap;
1017
1018 xoap = xva_getxoptattr(xvap);
1019 ASSERT(xoap);
1020
1021 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
1022 uint64_t times[2];
1023 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
1024 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
1025 ×, sizeof (times), tx);
1026 XVA_SET_RTN(xvap, XAT_CREATETIME);
1027 }
1028 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
1029 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
1030 zp->z_pflags, tx);
1031 XVA_SET_RTN(xvap, XAT_READONLY);
1032 }
1033 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
1034 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
1035 zp->z_pflags, tx);
1036 XVA_SET_RTN(xvap, XAT_HIDDEN);
1037 }
1038 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
1039 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
1040 zp->z_pflags, tx);
1041 XVA_SET_RTN(xvap, XAT_SYSTEM);
1042 }
1043 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
1044 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
1045 zp->z_pflags, tx);
1046 XVA_SET_RTN(xvap, XAT_ARCHIVE);
1047 }
1048 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
1049 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
1050 zp->z_pflags, tx);
1051 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
1052 }
1053 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
1054 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
1055 zp->z_pflags, tx);
1056 XVA_SET_RTN(xvap, XAT_NOUNLINK);
1057 }
1058 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
1059 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
1060 zp->z_pflags, tx);
1061 XVA_SET_RTN(xvap, XAT_APPENDONLY);
1062 }
1063 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
1064 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
1065 zp->z_pflags, tx);
1066 XVA_SET_RTN(xvap, XAT_NODUMP);
1067 }
1068 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
1069 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
1070 zp->z_pflags, tx);
1071 XVA_SET_RTN(xvap, XAT_OPAQUE);
1072 }
1073 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
1074 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
1075 xoap->xoa_av_quarantined, zp->z_pflags, tx);
1076 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
1077 }
1078 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
1079 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
1080 zp->z_pflags, tx);
1081 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
1082 }
1083 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
1084 zfs_sa_set_scanstamp(zp, xvap, tx);
1085 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
1086 }
1087 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
1088 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
1089 zp->z_pflags, tx);
1090 XVA_SET_RTN(xvap, XAT_REPARSE);
1091 }
1092 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
1093 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
1094 zp->z_pflags, tx);
1095 XVA_SET_RTN(xvap, XAT_OFFLINE);
1096 }
1097 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
1098 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
1099 zp->z_pflags, tx);
1100 XVA_SET_RTN(xvap, XAT_SPARSE);
1101 }
1102 }
1103
1104 int
zfs_zget(zfsvfs_t * zfsvfs,uint64_t obj_num,znode_t ** zpp)1105 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
1106 {
1107 dmu_object_info_t doi;
1108 dmu_buf_t *db;
1109 znode_t *zp;
1110 int err;
1111 sa_handle_t *hdl;
1112
1113 *zpp = NULL;
1114
1115 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1116
1117 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1118 if (err) {
1119 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1120 return (err);
1121 }
1122
1123 dmu_object_info_from_db(db, &doi);
1124 if (doi.doi_bonus_type != DMU_OT_SA &&
1125 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1126 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1127 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1128 sa_buf_rele(db, NULL);
1129 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1130 return (SET_ERROR(EINVAL));
1131 }
1132
1133 hdl = dmu_buf_get_user(db);
1134 if (hdl != NULL) {
1135 zp = sa_get_userdata(hdl);
1136
1137
1138 /*
1139 * Since "SA" does immediate eviction we
1140 * should never find a sa handle that doesn't
1141 * know about the znode.
1142 */
1143
1144 ASSERT3P(zp, !=, NULL);
1145
1146 mutex_enter(&zp->z_lock);
1147 ASSERT3U(zp->z_id, ==, obj_num);
1148 if (zp->z_unlinked) {
1149 err = SET_ERROR(ENOENT);
1150 } else {
1151 VN_HOLD(ZTOV(zp));
1152 *zpp = zp;
1153 err = 0;
1154 }
1155 sa_buf_rele(db, NULL);
1156 mutex_exit(&zp->z_lock);
1157 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1158 return (err);
1159 }
1160
1161 /*
1162 * Not found create new znode/vnode
1163 * but only if file exists.
1164 *
1165 * There is a small window where zfs_vget() could
1166 * find this object while a file create is still in
1167 * progress. This is checked for in zfs_znode_alloc()
1168 *
1169 * if zfs_znode_alloc() fails it will drop the hold on the
1170 * bonus buffer.
1171 */
1172 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
1173 doi.doi_bonus_type, NULL);
1174 if (zp == NULL) {
1175 err = SET_ERROR(ENOENT);
1176 } else {
1177 if (zp->z_links == 0)
1178 zp->z_unlinked = B_TRUE;
1179 *zpp = zp;
1180 }
1181 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1182 return (err);
1183 }
1184
1185 int
zfs_rezget(znode_t * zp)1186 zfs_rezget(znode_t *zp)
1187 {
1188 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1189 dmu_object_info_t doi;
1190 dmu_buf_t *db;
1191 uint64_t obj_num = zp->z_id;
1192 uint64_t mode;
1193 sa_bulk_attr_t bulk[8];
1194 int err;
1195 int count = 0;
1196 uint64_t gen;
1197
1198 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1199
1200 mutex_enter(&zp->z_acl_lock);
1201 if (zp->z_acl_cached) {
1202 zfs_acl_free(zp->z_acl_cached);
1203 zp->z_acl_cached = NULL;
1204 }
1205
1206 mutex_exit(&zp->z_acl_lock);
1207 ASSERT(zp->z_sa_hdl == NULL);
1208 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1209 if (err) {
1210 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1211 return (err);
1212 }
1213
1214 dmu_object_info_from_db(db, &doi);
1215 if (doi.doi_bonus_type != DMU_OT_SA &&
1216 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1217 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1218 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1219 sa_buf_rele(db, NULL);
1220 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1221 return (SET_ERROR(EINVAL));
1222 }
1223
1224 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1225
1226 /* reload cached values */
1227 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1228 &gen, sizeof (gen));
1229 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1230 &zp->z_size, sizeof (zp->z_size));
1231 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1232 &zp->z_links, sizeof (zp->z_links));
1233 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1234 &zp->z_pflags, sizeof (zp->z_pflags));
1235 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1236 &zp->z_atime, sizeof (zp->z_atime));
1237 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1238 &zp->z_uid, sizeof (zp->z_uid));
1239 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1240 &zp->z_gid, sizeof (zp->z_gid));
1241 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1242 &mode, sizeof (mode));
1243
1244 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1245 zfs_znode_dmu_fini(zp);
1246 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1247 return (SET_ERROR(EIO));
1248 }
1249
1250 zp->z_mode = mode;
1251
1252 if (gen != zp->z_gen) {
1253 zfs_znode_dmu_fini(zp);
1254 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1255 return (SET_ERROR(EIO));
1256 }
1257
1258 zp->z_unlinked = (zp->z_links == 0);
1259 zp->z_blksz = doi.doi_data_block_size;
1260
1261 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1262
1263 return (0);
1264 }
1265
1266 void
zfs_znode_delete(znode_t * zp,dmu_tx_t * tx)1267 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1268 {
1269 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1270 objset_t *os = zfsvfs->z_os;
1271 uint64_t obj = zp->z_id;
1272 uint64_t acl_obj = zfs_external_acl(zp);
1273
1274 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
1275 if (acl_obj) {
1276 VERIFY(!zp->z_is_sa);
1277 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1278 }
1279 VERIFY(0 == dmu_object_free(os, obj, tx));
1280 zfs_znode_dmu_fini(zp);
1281 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1282 zfs_znode_free(zp);
1283 }
1284
1285 void
zfs_zinactive(znode_t * zp)1286 zfs_zinactive(znode_t *zp)
1287 {
1288 vnode_t *vp = ZTOV(zp);
1289 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1290 uint64_t z_id = zp->z_id;
1291
1292 ASSERT(zp->z_sa_hdl);
1293
1294 /*
1295 * Don't allow a zfs_zget() while were trying to release this znode
1296 */
1297 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
1298
1299 mutex_enter(&zp->z_lock);
1300 mutex_enter(&vp->v_lock);
1301 vp->v_count--;
1302 if (vp->v_count > 0 || vn_has_cached_data(vp)) {
1303 /*
1304 * If the hold count is greater than zero, somebody has
1305 * obtained a new reference on this znode while we were
1306 * processing it here, so we are done. If we still have
1307 * mapped pages then we are also done, since we don't
1308 * want to inactivate the znode until the pages get pushed.
1309 *
1310 * XXX - if vn_has_cached_data(vp) is true, but count == 0,
1311 * this seems like it would leave the znode hanging with
1312 * no chance to go inactive...
1313 */
1314 mutex_exit(&vp->v_lock);
1315 mutex_exit(&zp->z_lock);
1316 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1317 return;
1318 }
1319 mutex_exit(&vp->v_lock);
1320
1321 /*
1322 * If this was the last reference to a file with no links,
1323 * remove the file from the file system.
1324 */
1325 if (zp->z_unlinked) {
1326 mutex_exit(&zp->z_lock);
1327 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1328 zfs_rmnode(zp);
1329 return;
1330 }
1331
1332 mutex_exit(&zp->z_lock);
1333 zfs_znode_dmu_fini(zp);
1334 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1335 zfs_znode_free(zp);
1336 }
1337
1338 void
zfs_znode_free(znode_t * zp)1339 zfs_znode_free(znode_t *zp)
1340 {
1341 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1342
1343 vn_invalid(ZTOV(zp));
1344
1345 ASSERT(ZTOV(zp)->v_count == 0);
1346
1347 mutex_enter(&zfsvfs->z_znodes_lock);
1348 POINTER_INVALIDATE(&zp->z_zfsvfs);
1349 list_remove(&zfsvfs->z_all_znodes, zp);
1350 mutex_exit(&zfsvfs->z_znodes_lock);
1351
1352 if (zp->z_acl_cached) {
1353 zfs_acl_free(zp->z_acl_cached);
1354 zp->z_acl_cached = NULL;
1355 }
1356
1357 kmem_cache_free(znode_cache, zp);
1358
1359 VFS_RELE(zfsvfs->z_vfs);
1360 }
1361
1362 void
zfs_tstamp_update_setup(znode_t * zp,uint_t flag,uint64_t mtime[2],uint64_t ctime[2],boolean_t have_tx)1363 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1364 uint64_t ctime[2], boolean_t have_tx)
1365 {
1366 timestruc_t now;
1367
1368 gethrestime(&now);
1369
1370 if (have_tx) { /* will sa_bulk_update happen really soon? */
1371 zp->z_atime_dirty = 0;
1372 zp->z_seq++;
1373 } else {
1374 zp->z_atime_dirty = 1;
1375 }
1376
1377 if (flag & AT_ATIME) {
1378 ZFS_TIME_ENCODE(&now, zp->z_atime);
1379 }
1380
1381 if (flag & AT_MTIME) {
1382 ZFS_TIME_ENCODE(&now, mtime);
1383 if (zp->z_zfsvfs->z_use_fuids) {
1384 zp->z_pflags |= (ZFS_ARCHIVE |
1385 ZFS_AV_MODIFIED);
1386 }
1387 }
1388
1389 if (flag & AT_CTIME) {
1390 ZFS_TIME_ENCODE(&now, ctime);
1391 if (zp->z_zfsvfs->z_use_fuids)
1392 zp->z_pflags |= ZFS_ARCHIVE;
1393 }
1394 }
1395
1396 /*
1397 * Grow the block size for a file.
1398 *
1399 * IN: zp - znode of file to free data in.
1400 * size - requested block size
1401 * tx - open transaction.
1402 *
1403 * NOTE: this function assumes that the znode is write locked.
1404 */
1405 void
zfs_grow_blocksize(znode_t * zp,uint64_t size,dmu_tx_t * tx)1406 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1407 {
1408 int error;
1409 u_longlong_t dummy;
1410
1411 if (size <= zp->z_blksz)
1412 return;
1413 /*
1414 * If the file size is already greater than the current blocksize,
1415 * we will not grow. If there is more than one block in a file,
1416 * the blocksize cannot change.
1417 */
1418 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1419 return;
1420
1421 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
1422 size, 0, tx);
1423
1424 if (error == ENOTSUP)
1425 return;
1426 ASSERT0(error);
1427
1428 /* What blocksize did we actually get? */
1429 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1430 }
1431
1432 /*
1433 * This is a dummy interface used when pvn_vplist_dirty() should *not*
1434 * be calling back into the fs for a putpage(). E.g.: when truncating
1435 * a file, the pages being "thrown away* don't need to be written out.
1436 */
1437 /* ARGSUSED */
1438 static int
zfs_no_putpage(vnode_t * vp,page_t * pp,u_offset_t * offp,size_t * lenp,int flags,cred_t * cr)1439 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
1440 int flags, cred_t *cr)
1441 {
1442 ASSERT(0);
1443 return (0);
1444 }
1445
1446 /*
1447 * Increase the file length
1448 *
1449 * IN: zp - znode of file to free data in.
1450 * end - new end-of-file
1451 *
1452 * RETURN: 0 on success, error code on failure
1453 *
1454 * Assumption: File is already range-locked for changing zp_size
1455 */
1456 static int
zfs_extend(znode_t * zp,uint64_t end)1457 zfs_extend(znode_t *zp, uint64_t end)
1458 {
1459 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1460 dmu_tx_t *tx;
1461 uint64_t newblksz;
1462 int error;
1463
1464 /*
1465 * Nothing to do if file already at desired length.
1466 */
1467 if (end <= zp->z_size)
1468 return (0);
1469
1470 tx = dmu_tx_create(zfsvfs->z_os);
1471 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1472 zfs_sa_upgrade_txholds(tx, zp);
1473 if (end > zp->z_blksz &&
1474 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1475 /*
1476 * We are growing the file past the current block size.
1477 */
1478 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
1479 /*
1480 * File's blocksize is already larger than the
1481 * "recordsize" property. Only let it grow to
1482 * the next power of 2.
1483 */
1484 ASSERT(!ISP2(zp->z_blksz));
1485 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1486 } else {
1487 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
1488 }
1489 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1490 } else {
1491 newblksz = 0;
1492 }
1493
1494 error = dmu_tx_assign(tx, TXG_WAIT);
1495 if (error) {
1496 dmu_tx_abort(tx);
1497 return (error);
1498 }
1499
1500 if (newblksz)
1501 zfs_grow_blocksize(zp, newblksz, tx);
1502
1503 zp->z_size = end;
1504
1505 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
1506 &zp->z_size, sizeof (zp->z_size), tx));
1507
1508 dmu_tx_commit(tx);
1509
1510 return (0);
1511 }
1512
1513 /*
1514 * Free space in a file.
1515 *
1516 * IN: zp - znode of file to free data in.
1517 * off - start of section to free.
1518 * len - length of section to free.
1519 *
1520 * RETURN: 0 on success, error code on failure
1521 *
1522 * Assumption: file is already range-locked for changing zp_size
1523 */
1524 static int
zfs_free_range(znode_t * zp,uint64_t off,uint64_t len)1525 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1526 {
1527 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1528 int error;
1529
1530 /*
1531 * Nothing to do if file already at desired length.
1532 */
1533 if (off >= zp->z_size)
1534 return (0);
1535
1536 if (off + len > zp->z_size)
1537 len = zp->z_size - off;
1538
1539 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1540
1541 return (error);
1542 }
1543
1544 /*
1545 * Truncate a file
1546 *
1547 * IN: zp - znode of file to free data in.
1548 * end - new end-of-file.
1549 *
1550 * RETURN: 0 on success, error code on failure
1551 *
1552 * Assumption: file is already range-locked for changing zp_size
1553 */
1554 static int
zfs_trunc(znode_t * zp,uint64_t end)1555 zfs_trunc(znode_t *zp, uint64_t end)
1556 {
1557 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1558 vnode_t *vp = ZTOV(zp);
1559 dmu_tx_t *tx;
1560 int error;
1561 sa_bulk_attr_t bulk[2];
1562 int count = 0;
1563
1564 /*
1565 * Nothing to do if file already at desired length.
1566 */
1567 if (end >= zp->z_size)
1568 return (0);
1569
1570 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1);
1571 if (error)
1572 return (error);
1573
1574 tx = dmu_tx_create(zfsvfs->z_os);
1575 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1576 zfs_sa_upgrade_txholds(tx, zp);
1577 dmu_tx_mark_netfree(tx);
1578 error = dmu_tx_assign(tx, TXG_WAIT);
1579 if (error) {
1580 dmu_tx_abort(tx);
1581 return (error);
1582 }
1583
1584 zp->z_size = end;
1585 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1586 NULL, &zp->z_size, sizeof (zp->z_size));
1587
1588 if (end == 0) {
1589 zp->z_pflags &= ~ZFS_SPARSE;
1590 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1591 NULL, &zp->z_pflags, 8);
1592 }
1593 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1594
1595 dmu_tx_commit(tx);
1596
1597 /*
1598 * Clear any mapped pages in the truncated region. This has to
1599 * happen outside of the transaction to avoid the possibility of
1600 * a deadlock with someone trying to push a page that we are
1601 * about to invalidate.
1602 */
1603 if (vn_has_cached_data(vp)) {
1604 page_t *pp;
1605 uint64_t start = end & PAGEMASK;
1606 int poff = end & PAGEOFFSET;
1607
1608 if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) {
1609 /*
1610 * We need to zero a partial page.
1611 */
1612 pagezero(pp, poff, PAGESIZE - poff);
1613 start += PAGESIZE;
1614 page_unlock(pp);
1615 }
1616 error = pvn_vplist_dirty(vp, start, zfs_no_putpage,
1617 B_INVAL | B_TRUNC, NULL);
1618 ASSERT(error == 0);
1619 }
1620
1621 return (0);
1622 }
1623
1624 /*
1625 * Free space in a file
1626 *
1627 * IN: zp - znode of file to free data in.
1628 * off - start of range
1629 * len - end of range (0 => EOF)
1630 * flag - current file open mode flags.
1631 * log - TRUE if this action should be logged
1632 *
1633 * RETURN: 0 on success, error code on failure
1634 */
1635 int
zfs_freesp(znode_t * zp,uint64_t off,uint64_t len,int flag,boolean_t log)1636 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1637 {
1638 vnode_t *vp = ZTOV(zp);
1639 dmu_tx_t *tx;
1640 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1641 zilog_t *zilog = zfsvfs->z_log;
1642 uint64_t mode;
1643 uint64_t mtime[2], ctime[2];
1644 sa_bulk_attr_t bulk[3];
1645 int count = 0;
1646 int error;
1647 rl_t *rl;
1648
1649 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1650 sizeof (mode))) != 0)
1651 return (error);
1652
1653 if (off > zp->z_size) {
1654 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1655 error = zfs_extend(zp, off+len);
1656 if (error == 0 && log)
1657 goto log;
1658
1659 zfs_range_unlock(rl);
1660 return (error);
1661 }
1662
1663 /*
1664 * Check for any locks in the region to be freed.
1665 */
1666 if (MANDLOCK(vp, (mode_t)mode)) {
1667 uint64_t length = (len ? len : zp->z_size - off);
1668 if (error = chklock(vp, FWRITE, off, length, flag, NULL))
1669 return (error);
1670 }
1671
1672 if (len == 0 || off + len > zp->z_size) {
1673 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1674 } else {
1675 ssize_t lock_off;
1676 ssize_t lock_len;
1677 #ifdef _KERNEL
1678 if (rz_zev_active()) {
1679 /* start of this megabyte */
1680 lock_off = P2ALIGN(off, ZEV_L1_SIZE);
1681 /* full megabytes */
1682 lock_len = len + (off - lock_off);
1683 lock_len = P2ROUNDUP(lock_len, ZEV_L1_SIZE);
1684 } else {
1685 lock_off = off;
1686 lock_len = len;
1687 }
1688 #else
1689 lock_off = off;
1690 lock_len = len;
1691 #endif
1692 rl = zfs_range_lock(zp, lock_off, lock_len, RL_WRITER);
1693 }
1694
1695 if (len == 0) {
1696 error = zfs_trunc(zp, off);
1697 } else {
1698 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1699 off + len > zp->z_size)
1700 error = zfs_extend(zp, off+len);
1701 }
1702
1703 if (error || !log) {
1704 zfs_range_unlock(rl);
1705 return (error);
1706 }
1707 log:
1708 tx = dmu_tx_create(zfsvfs->z_os);
1709 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1710 zfs_sa_upgrade_txholds(tx, zp);
1711 error = dmu_tx_assign(tx, TXG_WAIT);
1712 if (error) {
1713 dmu_tx_abort(tx);
1714 zfs_range_unlock(rl);
1715 return (error);
1716 }
1717
1718 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1719 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1720 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1721 NULL, &zp->z_pflags, 8);
1722 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
1723 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1724 ASSERT(error == 0);
1725
1726 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1727 zfs_range_unlock(rl);
1728
1729 dmu_tx_commit(tx);
1730 return (0);
1731 }
1732
1733 void
zfs_create_fs(objset_t * os,cred_t * cr,nvlist_t * zplprops,dmu_tx_t * tx)1734 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1735 {
1736 uint64_t moid, obj, sa_obj, version;
1737 uint64_t sense = ZFS_CASE_SENSITIVE;
1738 uint64_t norm = 0;
1739 nvpair_t *elem;
1740 int error;
1741 int i;
1742 znode_t *rootzp = NULL;
1743 zfsvfs_t *zfsvfs;
1744 vnode_t *vp;
1745 vattr_t vattr;
1746 znode_t *zp;
1747 zfs_acl_ids_t acl_ids;
1748
1749 /*
1750 * First attempt to create master node.
1751 */
1752 /*
1753 * In an empty objset, there are no blocks to read and thus
1754 * there can be no i/o errors (which we assert below).
1755 */
1756 moid = MASTER_NODE_OBJ;
1757 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1758 DMU_OT_NONE, 0, tx);
1759 ASSERT(error == 0);
1760
1761 /*
1762 * Set starting attributes.
1763 */
1764 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1765 elem = NULL;
1766 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1767 /* For the moment we expect all zpl props to be uint64_ts */
1768 uint64_t val;
1769 char *name;
1770
1771 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1772 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1773 name = nvpair_name(elem);
1774 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1775 if (val < version)
1776 version = val;
1777 } else {
1778 error = zap_update(os, moid, name, 8, 1, &val, tx);
1779 }
1780 ASSERT(error == 0);
1781 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1782 norm = val;
1783 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1784 sense = val;
1785 }
1786 ASSERT(version != 0);
1787 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1788
1789 /*
1790 * Create zap object used for SA attribute registration
1791 */
1792
1793 if (version >= ZPL_VERSION_SA) {
1794 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1795 DMU_OT_NONE, 0, tx);
1796 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1797 ASSERT(error == 0);
1798 } else {
1799 sa_obj = 0;
1800 }
1801 /*
1802 * Create a delete queue.
1803 */
1804 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1805
1806 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1807 ASSERT(error == 0);
1808
1809 /*
1810 * Create root znode. Create minimal znode/vnode/zfsvfs
1811 * to allow zfs_mknode to work.
1812 */
1813 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
1814 vattr.va_type = VDIR;
1815 vattr.va_mode = S_IFDIR|0755;
1816 vattr.va_uid = crgetuid(cr);
1817 vattr.va_gid = crgetgid(cr);
1818
1819 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1820 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
1821 rootzp->z_moved = 0;
1822 rootzp->z_unlinked = 0;
1823 rootzp->z_atime_dirty = 0;
1824 rootzp->z_is_sa = USE_SA(version, os);
1825
1826 vp = ZTOV(rootzp);
1827 vn_reinit(vp);
1828 vp->v_type = VDIR;
1829
1830 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1831 zfsvfs->z_os = os;
1832 zfsvfs->z_parent = zfsvfs;
1833 zfsvfs->z_version = version;
1834 zfsvfs->z_use_fuids = USE_FUIDS(version, os);
1835 zfsvfs->z_use_sa = USE_SA(version, os);
1836 zfsvfs->z_norm = norm;
1837
1838 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1839 &zfsvfs->z_attr_table);
1840
1841 ASSERT(error == 0);
1842
1843 /*
1844 * Fold case on file systems that are always or sometimes case
1845 * insensitive.
1846 */
1847 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1848 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
1849
1850 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1851 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1852 offsetof(znode_t, z_link_node));
1853
1854 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1855 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1856
1857 rootzp->z_zfsvfs = zfsvfs;
1858 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1859 cr, NULL, &acl_ids));
1860 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1861 ASSERT3P(zp, ==, rootzp);
1862 ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */
1863 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1864 ASSERT(error == 0);
1865 zfs_acl_ids_free(&acl_ids);
1866 POINTER_INVALIDATE(&rootzp->z_zfsvfs);
1867
1868 ZTOV(rootzp)->v_count = 0;
1869 sa_handle_destroy(rootzp->z_sa_hdl);
1870 kmem_cache_free(znode_cache, rootzp);
1871
1872 /*
1873 * Create shares directory
1874 */
1875
1876 error = zfs_create_share_dir(zfsvfs, tx);
1877
1878 ASSERT(error == 0);
1879
1880 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1881 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1882 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1883 }
1884
1885 #endif /* _KERNEL */
1886
1887 static int
zfs_sa_setup(objset_t * osp,sa_attr_type_t ** sa_table)1888 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1889 {
1890 uint64_t sa_obj = 0;
1891 int error;
1892
1893 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1894 if (error != 0 && error != ENOENT)
1895 return (error);
1896
1897 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1898 return (error);
1899 }
1900
1901 static int
zfs_grab_sa_handle(objset_t * osp,uint64_t obj,sa_handle_t ** hdlp,dmu_buf_t ** db,void * tag)1902 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
1903 dmu_buf_t **db, void *tag)
1904 {
1905 dmu_object_info_t doi;
1906 int error;
1907
1908 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
1909 return (error);
1910
1911 dmu_object_info_from_db(*db, &doi);
1912 if ((doi.doi_bonus_type != DMU_OT_SA &&
1913 doi.doi_bonus_type != DMU_OT_ZNODE) ||
1914 doi.doi_bonus_type == DMU_OT_ZNODE &&
1915 doi.doi_bonus_size < sizeof (znode_phys_t)) {
1916 sa_buf_rele(*db, tag);
1917 return (SET_ERROR(ENOTSUP));
1918 }
1919
1920 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
1921 if (error != 0) {
1922 sa_buf_rele(*db, tag);
1923 return (error);
1924 }
1925
1926 return (0);
1927 }
1928
1929 void
zfs_release_sa_handle(sa_handle_t * hdl,dmu_buf_t * db,void * tag)1930 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
1931 {
1932 sa_handle_destroy(hdl);
1933 sa_buf_rele(db, tag);
1934 }
1935
1936 /*
1937 * Given an object number, return its parent object number and whether
1938 * or not the object is an extended attribute directory.
1939 */
1940 static int
zfs_obj_to_pobj(objset_t * osp,sa_handle_t * hdl,sa_attr_type_t * sa_table,uint64_t * pobjp,int * is_xattrdir)1941 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
1942 uint64_t *pobjp, int *is_xattrdir)
1943 {
1944 uint64_t parent;
1945 uint64_t pflags;
1946 uint64_t mode;
1947 uint64_t parent_mode;
1948 sa_bulk_attr_t bulk[3];
1949 sa_handle_t *sa_hdl;
1950 dmu_buf_t *sa_db;
1951 int count = 0;
1952 int error;
1953
1954 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
1955 &parent, sizeof (parent));
1956 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
1957 &pflags, sizeof (pflags));
1958 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
1959 &mode, sizeof (mode));
1960
1961 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
1962 return (error);
1963
1964 /*
1965 * When a link is removed its parent pointer is not changed and will
1966 * be invalid. There are two cases where a link is removed but the
1967 * file stays around, when it goes to the delete queue and when there
1968 * are additional links.
1969 */
1970 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
1971 if (error != 0)
1972 return (error);
1973
1974 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
1975 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
1976 if (error != 0)
1977 return (error);
1978
1979 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
1980
1981 /*
1982 * Extended attributes can be applied to files, directories, etc.
1983 * Otherwise the parent must be a directory.
1984 */
1985 if (!*is_xattrdir && !S_ISDIR(parent_mode))
1986 return (SET_ERROR(EINVAL));
1987
1988 *pobjp = parent;
1989
1990 return (0);
1991 }
1992
1993 /*
1994 * Given an object number, return some zpl level statistics
1995 */
1996 static int
zfs_obj_to_stats_impl(sa_handle_t * hdl,sa_attr_type_t * sa_table,zfs_stat_t * sb)1997 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
1998 zfs_stat_t *sb)
1999 {
2000 sa_bulk_attr_t bulk[4];
2001 int count = 0;
2002
2003 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2004 &sb->zs_mode, sizeof (sb->zs_mode));
2005 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
2006 &sb->zs_gen, sizeof (sb->zs_gen));
2007 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
2008 &sb->zs_links, sizeof (sb->zs_links));
2009 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
2010 &sb->zs_ctime, sizeof (sb->zs_ctime));
2011
2012 return (sa_bulk_lookup(hdl, bulk, count));
2013 }
2014
2015 static int
zfs_obj_to_path_impl(objset_t * osp,uint64_t obj,sa_handle_t * hdl,sa_attr_type_t * sa_table,char * buf,int len)2016 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
2017 sa_attr_type_t *sa_table, char *buf, int len)
2018 {
2019 sa_handle_t *sa_hdl;
2020 sa_handle_t *prevhdl = NULL;
2021 dmu_buf_t *prevdb = NULL;
2022 dmu_buf_t *sa_db = NULL;
2023 char *path = buf + len - 1;
2024 int error;
2025
2026 *path = '\0';
2027 sa_hdl = hdl;
2028
2029 for (;;) {
2030 uint64_t pobj;
2031 char component[MAXNAMELEN + 2];
2032 size_t complen;
2033 int is_xattrdir;
2034
2035 if (prevdb)
2036 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
2037
2038 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
2039 &is_xattrdir)) != 0)
2040 break;
2041
2042 if (pobj == obj) {
2043 if (path[0] != '/')
2044 *--path = '/';
2045 break;
2046 }
2047
2048 component[0] = '/';
2049 if (is_xattrdir) {
2050 (void) sprintf(component + 1, "<xattrdir>");
2051 } else {
2052 error = zap_value_search(osp, pobj, obj,
2053 ZFS_DIRENT_OBJ(-1ULL), component + 1);
2054 if (error != 0)
2055 break;
2056 }
2057
2058 complen = strlen(component);
2059 path -= complen;
2060 ASSERT(path >= buf);
2061 bcopy(component, path, complen);
2062 obj = pobj;
2063
2064 if (sa_hdl != hdl) {
2065 prevhdl = sa_hdl;
2066 prevdb = sa_db;
2067 }
2068 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
2069 if (error != 0) {
2070 sa_hdl = prevhdl;
2071 sa_db = prevdb;
2072 break;
2073 }
2074 }
2075
2076 if (sa_hdl != NULL && sa_hdl != hdl) {
2077 ASSERT(sa_db != NULL);
2078 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2079 }
2080
2081 if (error == 0)
2082 (void) memmove(buf, path, buf + len - path);
2083
2084 return (error);
2085 }
2086
2087 int
zfs_obj_to_path(objset_t * osp,uint64_t obj,char * buf,int len)2088 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
2089 {
2090 sa_attr_type_t *sa_table;
2091 sa_handle_t *hdl;
2092 dmu_buf_t *db;
2093 int error;
2094
2095 error = zfs_sa_setup(osp, &sa_table);
2096 if (error != 0)
2097 return (error);
2098
2099 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2100 if (error != 0)
2101 return (error);
2102
2103 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2104
2105 zfs_release_sa_handle(hdl, db, FTAG);
2106 return (error);
2107 }
2108
2109 int
zfs_obj_to_stats(objset_t * osp,uint64_t obj,zfs_stat_t * sb,char * buf,int len)2110 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
2111 char *buf, int len)
2112 {
2113 char *path = buf + len - 1;
2114 sa_attr_type_t *sa_table;
2115 sa_handle_t *hdl;
2116 dmu_buf_t *db;
2117 int error;
2118
2119 *path = '\0';
2120
2121 error = zfs_sa_setup(osp, &sa_table);
2122 if (error != 0)
2123 return (error);
2124
2125 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2126 if (error != 0)
2127 return (error);
2128
2129 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
2130 if (error != 0) {
2131 zfs_release_sa_handle(hdl, db, FTAG);
2132 return (error);
2133 }
2134
2135 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2136
2137 zfs_release_sa_handle(hdl, db, FTAG);
2138 return (error);
2139 }
2140