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 * Copyright (c) 2014 Integros [integros.com]
25 */
26
27 /* Portions Copyright 2007 Jeremy Teo */
28
29 #ifdef _KERNEL
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <sys/resource.h>
36 #include <sys/mntent.h>
37 #include <sys/mkdev.h>
38 #include <sys/u8_textprep.h>
39 #include <sys/dsl_dataset.h>
40 #include <sys/vfs.h>
41 #include <sys/vfs_opreg.h>
42 #include <sys/vnode.h>
43 #include <sys/file.h>
44 #include <sys/kmem.h>
45 #include <sys/errno.h>
46 #include <sys/unistd.h>
47 #include <sys/mode.h>
48 #include <sys/atomic.h>
49 #include <vm/pvn.h>
50 #include "fs/fs_subr.h"
51 #include <sys/zfs_dir.h>
52 #include <sys/zfs_acl.h>
53 #include <sys/zfs_ioctl.h>
54 #include <sys/zfs_rlock.h>
55 #include <sys/zfs_fuid.h>
56 #include <sys/dnode.h>
57 #include <sys/fs/zfs.h>
58 #include <sys/kidmap.h>
59 #endif /* _KERNEL */
60
61 #include <sys/dmu.h>
62 #include <sys/dmu_objset.h>
63 #include <sys/refcount.h>
64 #include <sys/stat.h>
65 #include <sys/zap.h>
66 #include <sys/zfs_znode.h>
67 #include <sys/sa.h>
68 #include <sys/zfs_sa.h>
69 #include <sys/zfs_stat.h>
70 #include <sys/zfs_events.h>
71 #include <zev/zev.h>
72
73 #include "zfs_prop.h"
74 #include "zfs_comutil.h"
75
76 /*
77 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only
78 * turned on when DEBUG is also defined.
79 */
80 #ifdef DEBUG
81 #define ZNODE_STATS
82 #endif /* DEBUG */
83
84 #ifdef ZNODE_STATS
85 #define ZNODE_STAT_ADD(stat) ((stat)++)
86 #else
87 #define ZNODE_STAT_ADD(stat) /* nothing */
88 #endif /* ZNODE_STATS */
89
90 /*
91 * Functions needed for userland (ie: libzpool) are not put under
92 * #ifdef_KERNEL; the rest of the functions have dependencies
93 * (such as VFS logic) that will not compile easily in userland.
94 */
95 #ifdef _KERNEL
96 /*
97 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to
98 * be freed before it can be safely accessed.
99 */
100 krwlock_t zfsvfs_lock;
101
102 static kmem_cache_t *znode_cache = NULL;
103
104 /*ARGSUSED*/
105 static void
znode_evict_error(dmu_buf_t * dbuf,void * user_ptr)106 znode_evict_error(dmu_buf_t *dbuf, void *user_ptr)
107 {
108 /*
109 * We should never drop all dbuf refs without first clearing
110 * the eviction callback.
111 */
112 panic("evicting znode %p\n", user_ptr);
113 }
114
115 /*ARGSUSED*/
116 static int
zfs_znode_cache_constructor(void * buf,void * arg,int kmflags)117 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
118 {
119 znode_t *zp = buf;
120
121 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
122
123 zp->z_vnode = vn_alloc(kmflags);
124 if (zp->z_vnode == NULL) {
125 return (-1);
126 }
127 ZTOV(zp)->v_data = zp;
128
129 list_link_init(&zp->z_link_node);
130
131 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
132 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
133 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
134 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
135
136 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
137 avl_create(&zp->z_range_avl, zfs_range_compare,
138 sizeof (rl_t), offsetof(rl_t, r_node));
139
140 zp->z_dirlocks = NULL;
141 zp->z_acl_cached = NULL;
142 zp->z_moved = 0;
143 return (0);
144 }
145
146 /*ARGSUSED*/
147 static void
zfs_znode_cache_destructor(void * buf,void * arg)148 zfs_znode_cache_destructor(void *buf, void *arg)
149 {
150 znode_t *zp = buf;
151
152 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
153 ASSERT(ZTOV(zp)->v_data == zp);
154 vn_free(ZTOV(zp));
155 ASSERT(!list_link_active(&zp->z_link_node));
156 mutex_destroy(&zp->z_lock);
157 rw_destroy(&zp->z_parent_lock);
158 rw_destroy(&zp->z_name_lock);
159 mutex_destroy(&zp->z_acl_lock);
160 avl_destroy(&zp->z_range_avl);
161 mutex_destroy(&zp->z_range_lock);
162
163 ASSERT(zp->z_dirlocks == NULL);
164 ASSERT(zp->z_acl_cached == NULL);
165 }
166
167 #ifdef ZNODE_STATS
168 static struct {
169 uint64_t zms_zfsvfs_invalid;
170 uint64_t zms_zfsvfs_recheck1;
171 uint64_t zms_zfsvfs_unmounted;
172 uint64_t zms_zfsvfs_recheck2;
173 uint64_t zms_obj_held;
174 uint64_t zms_vnode_locked;
175 uint64_t zms_not_only_dnlc;
176 } znode_move_stats;
177 #endif /* ZNODE_STATS */
178
179 static void
zfs_znode_move_impl(znode_t * ozp,znode_t * nzp)180 zfs_znode_move_impl(znode_t *ozp, znode_t *nzp)
181 {
182 vnode_t *vp;
183
184 /* Copy fields. */
185 nzp->z_zfsvfs = ozp->z_zfsvfs;
186
187 /* Swap vnodes. */
188 vp = nzp->z_vnode;
189 nzp->z_vnode = ozp->z_vnode;
190 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */
191 ZTOV(ozp)->v_data = ozp;
192 ZTOV(nzp)->v_data = nzp;
193
194 nzp->z_id = ozp->z_id;
195 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */
196 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0);
197 nzp->z_unlinked = ozp->z_unlinked;
198 nzp->z_atime_dirty = ozp->z_atime_dirty;
199 nzp->z_zn_prefetch = ozp->z_zn_prefetch;
200 nzp->z_blksz = ozp->z_blksz;
201 nzp->z_seq = ozp->z_seq;
202 nzp->z_mapcnt = ozp->z_mapcnt;
203 nzp->z_gen = ozp->z_gen;
204 nzp->z_sync_cnt = ozp->z_sync_cnt;
205 nzp->z_is_sa = ozp->z_is_sa;
206 nzp->z_sa_hdl = ozp->z_sa_hdl;
207 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2);
208 nzp->z_links = ozp->z_links;
209 nzp->z_size = ozp->z_size;
210 nzp->z_pflags = ozp->z_pflags;
211 nzp->z_uid = ozp->z_uid;
212 nzp->z_gid = ozp->z_gid;
213 nzp->z_mode = ozp->z_mode;
214 nzp->z_new_content = ozp->z_new_content;
215
216 /*
217 * Since this is just an idle znode and kmem is already dealing with
218 * memory pressure, release any cached ACL.
219 */
220 if (ozp->z_acl_cached) {
221 zfs_acl_free(ozp->z_acl_cached);
222 ozp->z_acl_cached = NULL;
223 }
224
225 sa_set_userp(nzp->z_sa_hdl, nzp);
226
227 /*
228 * Invalidate the original znode by clearing fields that provide a
229 * pointer back to the znode. Set the low bit of the vfs pointer to
230 * ensure that zfs_znode_move() recognizes the znode as invalid in any
231 * subsequent callback.
232 */
233 ozp->z_sa_hdl = NULL;
234 POINTER_INVALIDATE(&ozp->z_zfsvfs);
235
236 /*
237 * Mark the znode.
238 */
239 nzp->z_moved = 1;
240 ozp->z_moved = (uint8_t)-1;
241 }
242
243 /*ARGSUSED*/
244 static kmem_cbrc_t
zfs_znode_move(void * buf,void * newbuf,size_t size,void * arg)245 zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg)
246 {
247 znode_t *ozp = buf, *nzp = newbuf;
248 zfsvfs_t *zfsvfs;
249 vnode_t *vp;
250
251 /*
252 * The znode is on the file system's list of known znodes if the vfs
253 * pointer is valid. We set the low bit of the vfs pointer when freeing
254 * the znode to invalidate it, and the memory patterns written by kmem
255 * (baddcafe and deadbeef) set at least one of the two low bits. A newly
256 * created znode sets the vfs pointer last of all to indicate that the
257 * znode is known and in a valid state to be moved by this function.
258 */
259 zfsvfs = ozp->z_zfsvfs;
260 if (!POINTER_IS_VALID(zfsvfs)) {
261 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid);
262 return (KMEM_CBRC_DONT_KNOW);
263 }
264
265 /*
266 * Close a small window in which it's possible that the filesystem could
267 * be unmounted and freed, and zfsvfs, though valid in the previous
268 * statement, could point to unrelated memory by the time we try to
269 * prevent the filesystem from being unmounted.
270 */
271 rw_enter(&zfsvfs_lock, RW_WRITER);
272 if (zfsvfs != ozp->z_zfsvfs) {
273 rw_exit(&zfsvfs_lock);
274 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1);
275 return (KMEM_CBRC_DONT_KNOW);
276 }
277
278 /*
279 * If the znode is still valid, then so is the file system. We know that
280 * no valid file system can be freed while we hold zfsvfs_lock, so we
281 * can safely ensure that the filesystem is not and will not be
282 * unmounted. The next statement is equivalent to ZFS_ENTER().
283 */
284 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG);
285 if (zfsvfs->z_unmounted) {
286 ZFS_EXIT(zfsvfs);
287 rw_exit(&zfsvfs_lock);
288 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted);
289 return (KMEM_CBRC_DONT_KNOW);
290 }
291 rw_exit(&zfsvfs_lock);
292
293 mutex_enter(&zfsvfs->z_znodes_lock);
294 /*
295 * Recheck the vfs pointer in case the znode was removed just before
296 * acquiring the lock.
297 */
298 if (zfsvfs != ozp->z_zfsvfs) {
299 mutex_exit(&zfsvfs->z_znodes_lock);
300 ZFS_EXIT(zfsvfs);
301 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2);
302 return (KMEM_CBRC_DONT_KNOW);
303 }
304
305 /*
306 * At this point we know that as long as we hold z_znodes_lock, the
307 * znode cannot be freed and fields within the znode can be safely
308 * accessed. Now, prevent a race with zfs_zget().
309 */
310 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) {
311 mutex_exit(&zfsvfs->z_znodes_lock);
312 ZFS_EXIT(zfsvfs);
313 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held);
314 return (KMEM_CBRC_LATER);
315 }
316
317 vp = ZTOV(ozp);
318 if (mutex_tryenter(&vp->v_lock) == 0) {
319 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
320 mutex_exit(&zfsvfs->z_znodes_lock);
321 ZFS_EXIT(zfsvfs);
322 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked);
323 return (KMEM_CBRC_LATER);
324 }
325
326 /* Only move znodes that are referenced _only_ by the DNLC. */
327 if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
328 mutex_exit(&vp->v_lock);
329 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
330 mutex_exit(&zfsvfs->z_znodes_lock);
331 ZFS_EXIT(zfsvfs);
332 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc);
333 return (KMEM_CBRC_LATER);
334 }
335
336 /*
337 * The znode is known and in a valid state to move. We're holding the
338 * locks needed to execute the critical section.
339 */
340 zfs_znode_move_impl(ozp, nzp);
341 mutex_exit(&vp->v_lock);
342 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
343
344 list_link_replace(&ozp->z_link_node, &nzp->z_link_node);
345 mutex_exit(&zfsvfs->z_znodes_lock);
346 ZFS_EXIT(zfsvfs);
347
348 return (KMEM_CBRC_YES);
349 }
350
351 void
zfs_znode_init(void)352 zfs_znode_init(void)
353 {
354 /*
355 * Initialize zcache
356 */
357 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
358 ASSERT(znode_cache == NULL);
359 znode_cache = kmem_cache_create("zfs_znode_cache",
360 sizeof (znode_t), 0, zfs_znode_cache_constructor,
361 zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
362 kmem_cache_set_move(znode_cache, zfs_znode_move);
363 }
364
365 void
zfs_znode_fini(void)366 zfs_znode_fini(void)
367 {
368 /*
369 * Cleanup vfs & vnode ops
370 */
371 zfs_remove_op_tables();
372
373 /*
374 * Cleanup zcache
375 */
376 if (znode_cache)
377 kmem_cache_destroy(znode_cache);
378 znode_cache = NULL;
379 rw_destroy(&zfsvfs_lock);
380 }
381
382 struct vnodeops *zfs_dvnodeops;
383 struct vnodeops *zfs_fvnodeops;
384 struct vnodeops *zfs_symvnodeops;
385 struct vnodeops *zfs_xdvnodeops;
386 struct vnodeops *zfs_evnodeops;
387 struct vnodeops *zfs_sharevnodeops;
388
389 void
zfs_remove_op_tables()390 zfs_remove_op_tables()
391 {
392 /*
393 * Remove vfs ops
394 */
395 ASSERT(zfsfstype);
396 (void) vfs_freevfsops_by_type(zfsfstype);
397 zfsfstype = 0;
398
399 /*
400 * Remove vnode ops
401 */
402 if (zfs_dvnodeops)
403 vn_freevnodeops(zfs_dvnodeops);
404 if (zfs_fvnodeops)
405 vn_freevnodeops(zfs_fvnodeops);
406 if (zfs_symvnodeops)
407 vn_freevnodeops(zfs_symvnodeops);
408 if (zfs_xdvnodeops)
409 vn_freevnodeops(zfs_xdvnodeops);
410 if (zfs_evnodeops)
411 vn_freevnodeops(zfs_evnodeops);
412 if (zfs_sharevnodeops)
413 vn_freevnodeops(zfs_sharevnodeops);
414
415 zfs_dvnodeops = NULL;
416 zfs_fvnodeops = NULL;
417 zfs_symvnodeops = NULL;
418 zfs_xdvnodeops = NULL;
419 zfs_evnodeops = NULL;
420 zfs_sharevnodeops = NULL;
421 }
422
423 extern const fs_operation_def_t zfs_dvnodeops_template[];
424 extern const fs_operation_def_t zfs_fvnodeops_template[];
425 extern const fs_operation_def_t zfs_xdvnodeops_template[];
426 extern const fs_operation_def_t zfs_symvnodeops_template[];
427 extern const fs_operation_def_t zfs_evnodeops_template[];
428 extern const fs_operation_def_t zfs_sharevnodeops_template[];
429
430 int
zfs_create_op_tables()431 zfs_create_op_tables()
432 {
433 int error;
434
435 /*
436 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs()
437 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv).
438 * In this case we just return as the ops vectors are already set up.
439 */
440 if (zfs_dvnodeops)
441 return (0);
442
443 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template,
444 &zfs_dvnodeops);
445 if (error)
446 return (error);
447
448 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template,
449 &zfs_fvnodeops);
450 if (error)
451 return (error);
452
453 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template,
454 &zfs_symvnodeops);
455 if (error)
456 return (error);
457
458 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template,
459 &zfs_xdvnodeops);
460 if (error)
461 return (error);
462
463 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template,
464 &zfs_evnodeops);
465 if (error)
466 return (error);
467
468 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template,
469 &zfs_sharevnodeops);
470
471 return (error);
472 }
473
474 int
zfs_create_share_dir(zfsvfs_t * zfsvfs,dmu_tx_t * tx)475 zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
476 {
477 zfs_acl_ids_t acl_ids;
478 vattr_t vattr;
479 znode_t *sharezp;
480 vnode_t *vp;
481 znode_t *zp;
482 int error;
483
484 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
485 vattr.va_type = VDIR;
486 vattr.va_mode = S_IFDIR|0555;
487 vattr.va_uid = crgetuid(kcred);
488 vattr.va_gid = crgetgid(kcred);
489
490 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
491 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
492 sharezp->z_moved = 0;
493 sharezp->z_unlinked = 0;
494 sharezp->z_atime_dirty = 0;
495 sharezp->z_zfsvfs = zfsvfs;
496 sharezp->z_is_sa = zfsvfs->z_use_sa;
497
498 vp = ZTOV(sharezp);
499 vn_reinit(vp);
500 vp->v_type = VDIR;
501
502 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
503 kcred, NULL, &acl_ids));
504 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
505 ASSERT3P(zp, ==, sharezp);
506 ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
507 POINTER_INVALIDATE(&sharezp->z_zfsvfs);
508 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
509 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
510 zfsvfs->z_shares_dir = sharezp->z_id;
511
512 zfs_acl_ids_free(&acl_ids);
513 ZTOV(sharezp)->v_count = 0;
514 sa_handle_destroy(sharezp->z_sa_hdl);
515 kmem_cache_free(znode_cache, sharezp);
516
517 return (error);
518 }
519
520 /*
521 * define a couple of values we need available
522 * for both 64 and 32 bit environments.
523 */
524 #ifndef NBITSMINOR64
525 #define NBITSMINOR64 32
526 #endif
527 #ifndef MAXMAJ64
528 #define MAXMAJ64 0xffffffffUL
529 #endif
530 #ifndef MAXMIN64
531 #define MAXMIN64 0xffffffffUL
532 #endif
533
534 /*
535 * Create special expldev for ZFS private use.
536 * Can't use standard expldev since it doesn't do
537 * what we want. The standard expldev() takes a
538 * dev32_t in LP64 and expands it to a long dev_t.
539 * We need an interface that takes a dev32_t in ILP32
540 * and expands it to a long dev_t.
541 */
542 static uint64_t
zfs_expldev(dev_t dev)543 zfs_expldev(dev_t dev)
544 {
545 #ifndef _LP64
546 major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32;
547 return (((uint64_t)major << NBITSMINOR64) |
548 ((minor_t)dev & MAXMIN32));
549 #else
550 return (dev);
551 #endif
552 }
553
554 /*
555 * Special cmpldev for ZFS private use.
556 * Can't use standard cmpldev since it takes
557 * a long dev_t and compresses it to dev32_t in
558 * LP64. We need to do a compaction of a long dev_t
559 * to a dev32_t in ILP32.
560 */
561 dev_t
zfs_cmpldev(uint64_t dev)562 zfs_cmpldev(uint64_t dev)
563 {
564 #ifndef _LP64
565 minor_t minor = (minor_t)dev & MAXMIN64;
566 major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64;
567
568 if (major > MAXMAJ32 || minor > MAXMIN32)
569 return (NODEV32);
570
571 return (((dev32_t)major << NBITSMINOR32) | minor);
572 #else
573 return (dev);
574 #endif
575 }
576
577 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)578 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
579 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
580 {
581 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs));
582 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));
583
584 mutex_enter(&zp->z_lock);
585
586 ASSERT(zp->z_sa_hdl == NULL);
587 ASSERT(zp->z_acl_cached == NULL);
588 if (sa_hdl == NULL) {
589 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
590 SA_HDL_SHARED, &zp->z_sa_hdl));
591 } else {
592 zp->z_sa_hdl = sa_hdl;
593 sa_set_userp(sa_hdl, zp);
594 }
595
596 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
597
598 /*
599 * Slap on VROOT if we are the root znode
600 */
601 if (zp->z_id == zfsvfs->z_root)
602 ZTOV(zp)->v_flag |= VROOT;
603
604 mutex_exit(&zp->z_lock);
605 vn_exists(ZTOV(zp));
606 }
607
608 void
zfs_znode_dmu_fini(znode_t * zp)609 zfs_znode_dmu_fini(znode_t *zp)
610 {
611 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) ||
612 zp->z_unlinked ||
613 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock));
614
615 sa_handle_destroy(zp->z_sa_hdl);
616 zp->z_sa_hdl = NULL;
617 }
618
619 /*
620 * Construct a new znode/vnode and intialize.
621 *
622 * This does not do a call to dmu_set_user() that is
623 * up to the caller to do, in case you don't want to
624 * return the znode
625 */
626 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)627 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
628 dmu_object_type_t obj_type, sa_handle_t *hdl)
629 {
630 znode_t *zp;
631 vnode_t *vp;
632 uint64_t mode;
633 uint64_t parent;
634 sa_bulk_attr_t bulk[9];
635 int count = 0;
636
637 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
638
639 ASSERT(zp->z_dirlocks == NULL);
640 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
641 zp->z_moved = 0;
642
643 /*
644 * Defer setting z_zfsvfs until the znode is ready to be a candidate for
645 * the zfs_znode_move() callback.
646 */
647 zp->z_sa_hdl = NULL;
648 zp->z_unlinked = 0;
649 zp->z_atime_dirty = 0;
650 zp->z_mapcnt = 0;
651 zp->z_id = db->db_object;
652 zp->z_blksz = blksz;
653 zp->z_seq = 0x7A4653;
654 zp->z_sync_cnt = 0;
655 zp->z_new_content = 0;
656
657 vp = ZTOV(zp);
658 vn_reinit(vp);
659
660 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
661
662 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
663 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
664 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
665 &zp->z_size, 8);
666 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
667 &zp->z_links, 8);
668 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
669 &zp->z_pflags, 8);
670 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
671 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
672 &zp->z_atime, 16);
673 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
674 &zp->z_uid, 8);
675 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
676 &zp->z_gid, 8);
677
678 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
679 if (hdl == NULL)
680 sa_handle_destroy(zp->z_sa_hdl);
681 kmem_cache_free(znode_cache, zp);
682 return (NULL);
683 }
684
685 zp->z_mode = mode;
686 vp->v_vfsp = zfsvfs->z_parent->z_vfs;
687
688 vp->v_type = IFTOVT((mode_t)mode);
689
690 switch (vp->v_type) {
691 case VDIR:
692 if (zp->z_pflags & ZFS_XATTR) {
693 vn_setops(vp, zfs_xdvnodeops);
694 vp->v_flag |= V_XATTRDIR;
695 } else {
696 vn_setops(vp, zfs_dvnodeops);
697 }
698 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
699 break;
700 case VBLK:
701 case VCHR:
702 {
703 uint64_t rdev;
704 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
705 &rdev, sizeof (rdev)) == 0);
706
707 vp->v_rdev = zfs_cmpldev(rdev);
708 }
709 /*FALLTHROUGH*/
710 case VFIFO:
711 case VSOCK:
712 case VDOOR:
713 vn_setops(vp, zfs_fvnodeops);
714 break;
715 case VREG:
716 vp->v_flag |= VMODSORT;
717 if (parent == zfsvfs->z_shares_dir) {
718 ASSERT(zp->z_uid == 0 && zp->z_gid == 0);
719 vn_setops(vp, zfs_sharevnodeops);
720 } else {
721 vn_setops(vp, zfs_fvnodeops);
722 }
723 break;
724 case VLNK:
725 vn_setops(vp, zfs_symvnodeops);
726 break;
727 default:
728 vn_setops(vp, zfs_evnodeops);
729 break;
730 }
731
732 mutex_enter(&zfsvfs->z_znodes_lock);
733 list_insert_tail(&zfsvfs->z_all_znodes, zp);
734 membar_producer();
735 /*
736 * Everything else must be valid before assigning z_zfsvfs makes the
737 * znode eligible for zfs_znode_move().
738 */
739 zp->z_zfsvfs = zfsvfs;
740 mutex_exit(&zfsvfs->z_znodes_lock);
741
742 VFS_HOLD(zfsvfs->z_vfs);
743 return (zp);
744 }
745
746 static uint64_t empty_xattr;
747 static uint64_t pad[4];
748 static zfs_acl_phys_t acl_phys;
749 /*
750 * Create a new DMU object to hold a zfs znode.
751 *
752 * IN: dzp - parent directory for new znode
753 * vap - file attributes for new znode
754 * tx - dmu transaction id for zap operations
755 * cr - credentials of caller
756 * flag - flags:
757 * IS_ROOT_NODE - new object will be root
758 * IS_XATTR - new object is an attribute
759 * bonuslen - length of bonus buffer
760 * setaclp - File/Dir initial ACL
761 * fuidp - Tracks fuid allocation.
762 *
763 * OUT: zpp - allocated znode
764 *
765 */
766 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)767 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
768 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
769 {
770 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
771 uint64_t mode, size, links, parent, pflags;
772 uint64_t dzp_pflags = 0;
773 uint64_t rdev = 0;
774 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
775 dmu_buf_t *db;
776 timestruc_t now;
777 uint64_t gen, obj;
778 int bonuslen;
779 sa_handle_t *sa_hdl;
780 dmu_object_type_t obj_type;
781 sa_bulk_attr_t sa_attrs[ZPL_END];
782 int cnt = 0;
783 zfs_acl_locator_cb_t locate = { 0 };
784
785 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
786
787 if (zfsvfs->z_replay) {
788 obj = vap->va_nodeid;
789 now = vap->va_ctime; /* see zfs_replay_create() */
790 gen = vap->va_nblocks; /* ditto */
791 } else {
792 obj = 0;
793 gethrestime(&now);
794 gen = dmu_tx_get_txg(tx);
795 }
796
797 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
798 bonuslen = (obj_type == DMU_OT_SA) ?
799 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
800
801 /*
802 * Create a new DMU object.
803 */
804 /*
805 * There's currently no mechanism for pre-reading the blocks that will
806 * be needed to allocate a new object, so we accept the small chance
807 * that there will be an i/o error and we will fail one of the
808 * assertions below.
809 */
810 if (vap->va_type == VDIR) {
811 if (zfsvfs->z_replay) {
812 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj,
813 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
814 obj_type, bonuslen, tx));
815 } else {
816 obj = zap_create_norm(zfsvfs->z_os,
817 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
818 obj_type, bonuslen, tx);
819 }
820 } else {
821 if (zfsvfs->z_replay) {
822 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj,
823 DMU_OT_PLAIN_FILE_CONTENTS, 0,
824 obj_type, bonuslen, tx));
825 } else {
826 obj = dmu_object_alloc(zfsvfs->z_os,
827 DMU_OT_PLAIN_FILE_CONTENTS, 0,
828 obj_type, bonuslen, tx);
829 }
830 }
831
832 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
833 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
834
835 /*
836 * If this is the root, fix up the half-initialized parent pointer
837 * to reference the just-allocated physical data area.
838 */
839 if (flag & IS_ROOT_NODE) {
840 dzp->z_id = obj;
841 } else {
842 dzp_pflags = dzp->z_pflags;
843 }
844
845 /*
846 * If parent is an xattr, so am I.
847 */
848 if (dzp_pflags & ZFS_XATTR) {
849 flag |= IS_XATTR;
850 }
851
852 if (zfsvfs->z_use_fuids)
853 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
854 else
855 pflags = 0;
856
857 if (vap->va_type == VDIR) {
858 size = 2; /* contents ("." and "..") */
859 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
860 } else {
861 size = links = 0;
862 }
863
864 if (vap->va_type == VBLK || vap->va_type == VCHR) {
865 rdev = zfs_expldev(vap->va_rdev);
866 }
867
868 parent = dzp->z_id;
869 mode = acl_ids->z_mode;
870 if (flag & IS_XATTR)
871 pflags |= ZFS_XATTR;
872
873 /*
874 * No execs denied will be deterimed when zfs_mode_compute() is called.
875 */
876 pflags |= acl_ids->z_aclp->z_hints &
877 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
878 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
879
880 ZFS_TIME_ENCODE(&now, crtime);
881 ZFS_TIME_ENCODE(&now, ctime);
882
883 if (vap->va_mask & AT_ATIME) {
884 ZFS_TIME_ENCODE(&vap->va_atime, atime);
885 } else {
886 ZFS_TIME_ENCODE(&now, atime);
887 }
888
889 if (vap->va_mask & AT_MTIME) {
890 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
891 } else {
892 ZFS_TIME_ENCODE(&now, mtime);
893 }
894
895 /* Now add in all of the "SA" attributes */
896 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
897 &sa_hdl));
898
899 /*
900 * Setup the array of attributes to be replaced/set on the new file
901 *
902 * order for DMU_OT_ZNODE is critical since it needs to be constructed
903 * in the old znode_phys_t format. Don't change this ordering
904 */
905
906 if (obj_type == DMU_OT_ZNODE) {
907 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
908 NULL, &atime, 16);
909 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
910 NULL, &mtime, 16);
911 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
912 NULL, &ctime, 16);
913 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
914 NULL, &crtime, 16);
915 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
916 NULL, &gen, 8);
917 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
918 NULL, &mode, 8);
919 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
920 NULL, &size, 8);
921 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
922 NULL, &parent, 8);
923 } else {
924 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
925 NULL, &mode, 8);
926 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
927 NULL, &size, 8);
928 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
929 NULL, &gen, 8);
930 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
931 &acl_ids->z_fuid, 8);
932 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
933 &acl_ids->z_fgid, 8);
934 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
935 NULL, &parent, 8);
936 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
937 NULL, &pflags, 8);
938 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
939 NULL, &atime, 16);
940 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
941 NULL, &mtime, 16);
942 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
943 NULL, &ctime, 16);
944 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
945 NULL, &crtime, 16);
946 }
947
948 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
949
950 if (obj_type == DMU_OT_ZNODE) {
951 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
952 &empty_xattr, 8);
953 }
954 if (obj_type == DMU_OT_ZNODE ||
955 (vap->va_type == VBLK || vap->va_type == VCHR)) {
956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
957 NULL, &rdev, 8);
958
959 }
960 if (obj_type == DMU_OT_ZNODE) {
961 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
962 NULL, &pflags, 8);
963 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
964 &acl_ids->z_fuid, 8);
965 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
966 &acl_ids->z_fgid, 8);
967 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
968 sizeof (uint64_t) * 4);
969 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
970 &acl_phys, sizeof (zfs_acl_phys_t));
971 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
972 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
973 &acl_ids->z_aclp->z_acl_count, 8);
974 locate.cb_aclp = acl_ids->z_aclp;
975 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
976 zfs_acl_data_locator, &locate,
977 acl_ids->z_aclp->z_acl_bytes);
978 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
979 acl_ids->z_fuid, acl_ids->z_fgid);
980 }
981
982 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
983
984 if (!(flag & IS_ROOT_NODE)) {
985 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
986 ASSERT(*zpp != NULL);
987 } else {
988 /*
989 * If we are creating the root node, the "parent" we
990 * passed in is the znode for the root.
991 */
992 *zpp = dzp;
993
994 (*zpp)->z_sa_hdl = sa_hdl;
995 }
996
997 (*zpp)->z_pflags = pflags;
998 (*zpp)->z_mode = mode;
999
1000 if (vap->va_mask & AT_XVATTR)
1001 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx);
1002
1003 if (obj_type == DMU_OT_ZNODE ||
1004 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
1005 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
1006 }
1007 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1008 }
1009
1010 /*
1011 * Update in-core attributes. It is assumed the caller will be doing an
1012 * sa_bulk_update to push the changes out.
1013 */
1014 void
zfs_xvattr_set(znode_t * zp,xvattr_t * xvap,dmu_tx_t * tx)1015 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
1016 {
1017 xoptattr_t *xoap;
1018
1019 xoap = xva_getxoptattr(xvap);
1020 ASSERT(xoap);
1021
1022 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
1023 uint64_t times[2];
1024 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
1025 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
1026 ×, sizeof (times), tx);
1027 XVA_SET_RTN(xvap, XAT_CREATETIME);
1028 }
1029 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
1030 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
1031 zp->z_pflags, tx);
1032 XVA_SET_RTN(xvap, XAT_READONLY);
1033 }
1034 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
1035 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
1036 zp->z_pflags, tx);
1037 XVA_SET_RTN(xvap, XAT_HIDDEN);
1038 }
1039 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
1040 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
1041 zp->z_pflags, tx);
1042 XVA_SET_RTN(xvap, XAT_SYSTEM);
1043 }
1044 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
1045 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
1046 zp->z_pflags, tx);
1047 XVA_SET_RTN(xvap, XAT_ARCHIVE);
1048 }
1049 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
1050 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
1051 zp->z_pflags, tx);
1052 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
1053 }
1054 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
1055 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
1056 zp->z_pflags, tx);
1057 XVA_SET_RTN(xvap, XAT_NOUNLINK);
1058 }
1059 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
1060 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
1061 zp->z_pflags, tx);
1062 XVA_SET_RTN(xvap, XAT_APPENDONLY);
1063 }
1064 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
1065 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
1066 zp->z_pflags, tx);
1067 XVA_SET_RTN(xvap, XAT_NODUMP);
1068 }
1069 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
1070 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
1071 zp->z_pflags, tx);
1072 XVA_SET_RTN(xvap, XAT_OPAQUE);
1073 }
1074 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
1075 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
1076 xoap->xoa_av_quarantined, zp->z_pflags, tx);
1077 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
1078 }
1079 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
1080 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
1081 zp->z_pflags, tx);
1082 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
1083 }
1084 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
1085 zfs_sa_set_scanstamp(zp, xvap, tx);
1086 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
1087 }
1088 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
1089 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
1090 zp->z_pflags, tx);
1091 XVA_SET_RTN(xvap, XAT_REPARSE);
1092 }
1093 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
1094 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
1095 zp->z_pflags, tx);
1096 XVA_SET_RTN(xvap, XAT_OFFLINE);
1097 }
1098 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
1099 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
1100 zp->z_pflags, tx);
1101 XVA_SET_RTN(xvap, XAT_SPARSE);
1102 }
1103 }
1104
1105 int
zfs_zget(zfsvfs_t * zfsvfs,uint64_t obj_num,znode_t ** zpp)1106 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
1107 {
1108 dmu_object_info_t doi;
1109 dmu_buf_t *db;
1110 znode_t *zp;
1111 int err;
1112 sa_handle_t *hdl;
1113
1114 *zpp = NULL;
1115
1116 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1117
1118 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1119 if (err) {
1120 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1121 return (err);
1122 }
1123
1124 dmu_object_info_from_db(db, &doi);
1125 if (doi.doi_bonus_type != DMU_OT_SA &&
1126 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1127 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1128 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1129 sa_buf_rele(db, NULL);
1130 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1131 return (SET_ERROR(EINVAL));
1132 }
1133
1134 hdl = dmu_buf_get_user(db);
1135 if (hdl != NULL) {
1136 zp = sa_get_userdata(hdl);
1137
1138
1139 /*
1140 * Since "SA" does immediate eviction we
1141 * should never find a sa handle that doesn't
1142 * know about the znode.
1143 */
1144
1145 ASSERT3P(zp, !=, NULL);
1146
1147 mutex_enter(&zp->z_lock);
1148 ASSERT3U(zp->z_id, ==, obj_num);
1149 if (zp->z_unlinked) {
1150 err = SET_ERROR(ENOENT);
1151 } else {
1152 VN_HOLD(ZTOV(zp));
1153 *zpp = zp;
1154 err = 0;
1155 }
1156 mutex_exit(&zp->z_lock);
1157 sa_buf_rele(db, NULL);
1158 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1159 return (err);
1160 }
1161
1162 /*
1163 * Not found create new znode/vnode
1164 * but only if file exists.
1165 *
1166 * There is a small window where zfs_vget() could
1167 * find this object while a file create is still in
1168 * progress. This is checked for in zfs_znode_alloc()
1169 *
1170 * if zfs_znode_alloc() fails it will drop the hold on the
1171 * bonus buffer.
1172 */
1173 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
1174 doi.doi_bonus_type, NULL);
1175 if (zp == NULL) {
1176 err = SET_ERROR(ENOENT);
1177 } else {
1178 if (zp->z_links == 0)
1179 zp->z_unlinked = B_TRUE;
1180 *zpp = zp;
1181 }
1182 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1183 return (err);
1184 }
1185
1186 int
zfs_rezget(znode_t * zp)1187 zfs_rezget(znode_t *zp)
1188 {
1189 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1190 dmu_object_info_t doi;
1191 dmu_buf_t *db;
1192 uint64_t obj_num = zp->z_id;
1193 uint64_t mode;
1194 sa_bulk_attr_t bulk[8];
1195 int err;
1196 int count = 0;
1197 uint64_t gen;
1198
1199 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1200
1201 mutex_enter(&zp->z_acl_lock);
1202 if (zp->z_acl_cached) {
1203 zfs_acl_free(zp->z_acl_cached);
1204 zp->z_acl_cached = NULL;
1205 }
1206
1207 mutex_exit(&zp->z_acl_lock);
1208 ASSERT(zp->z_sa_hdl == NULL);
1209 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1210 if (err) {
1211 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1212 return (err);
1213 }
1214
1215 dmu_object_info_from_db(db, &doi);
1216 if (doi.doi_bonus_type != DMU_OT_SA &&
1217 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1218 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1219 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1220 sa_buf_rele(db, NULL);
1221 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1222 return (SET_ERROR(EINVAL));
1223 }
1224
1225 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1226
1227 /* reload cached values */
1228 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1229 &gen, sizeof (gen));
1230 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1231 &zp->z_size, sizeof (zp->z_size));
1232 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1233 &zp->z_links, sizeof (zp->z_links));
1234 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1235 &zp->z_pflags, sizeof (zp->z_pflags));
1236 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1237 &zp->z_atime, sizeof (zp->z_atime));
1238 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1239 &zp->z_uid, sizeof (zp->z_uid));
1240 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1241 &zp->z_gid, sizeof (zp->z_gid));
1242 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1243 &mode, sizeof (mode));
1244
1245 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1246 zfs_znode_dmu_fini(zp);
1247 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1248 return (SET_ERROR(EIO));
1249 }
1250
1251 zp->z_mode = mode;
1252
1253 if (gen != zp->z_gen) {
1254 zfs_znode_dmu_fini(zp);
1255 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1256 return (SET_ERROR(EIO));
1257 }
1258
1259 zp->z_unlinked = (zp->z_links == 0);
1260 zp->z_blksz = doi.doi_data_block_size;
1261
1262 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1263
1264 return (0);
1265 }
1266
1267 void
zfs_znode_delete(znode_t * zp,dmu_tx_t * tx)1268 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1269 {
1270 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1271 objset_t *os = zfsvfs->z_os;
1272 uint64_t obj = zp->z_id;
1273 uint64_t acl_obj = zfs_external_acl(zp);
1274
1275 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
1276 if (acl_obj) {
1277 VERIFY(!zp->z_is_sa);
1278 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1279 }
1280 VERIFY(0 == dmu_object_free(os, obj, tx));
1281 zfs_znode_dmu_fini(zp);
1282 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1283 zfs_znode_free(zp);
1284 }
1285
1286 void
zfs_zinactive(znode_t * zp)1287 zfs_zinactive(znode_t *zp)
1288 {
1289 vnode_t *vp = ZTOV(zp);
1290 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1291 uint64_t z_id = zp->z_id;
1292
1293 ASSERT(zp->z_sa_hdl);
1294
1295 /*
1296 * Don't allow a zfs_zget() while were trying to release this znode
1297 */
1298 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
1299
1300 mutex_enter(&zp->z_lock);
1301 mutex_enter(&vp->v_lock);
1302 vp->v_count--;
1303 if (vp->v_count > 0 || vn_has_cached_data(vp)) {
1304 /*
1305 * If the hold count is greater than zero, somebody has
1306 * obtained a new reference on this znode while we were
1307 * processing it here, so we are done. If we still have
1308 * mapped pages then we are also done, since we don't
1309 * want to inactivate the znode until the pages get pushed.
1310 *
1311 * XXX - if vn_has_cached_data(vp) is true, but count == 0,
1312 * this seems like it would leave the znode hanging with
1313 * no chance to go inactive...
1314 */
1315 mutex_exit(&vp->v_lock);
1316 mutex_exit(&zp->z_lock);
1317 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1318 return;
1319 }
1320 mutex_exit(&vp->v_lock);
1321
1322 /*
1323 * If this was the last reference to a file with no links,
1324 * remove the file from the file system.
1325 */
1326 if (zp->z_unlinked) {
1327 mutex_exit(&zp->z_lock);
1328 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1329 zfs_rmnode(zp);
1330 return;
1331 }
1332
1333 mutex_exit(&zp->z_lock);
1334 zfs_znode_dmu_fini(zp);
1335 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1336 zfs_znode_free(zp);
1337 }
1338
1339 void
zfs_znode_free(znode_t * zp)1340 zfs_znode_free(znode_t *zp)
1341 {
1342 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1343
1344 vn_invalid(ZTOV(zp));
1345
1346 ASSERT(ZTOV(zp)->v_count == 0);
1347
1348 mutex_enter(&zfsvfs->z_znodes_lock);
1349 POINTER_INVALIDATE(&zp->z_zfsvfs);
1350 list_remove(&zfsvfs->z_all_znodes, zp);
1351 mutex_exit(&zfsvfs->z_znodes_lock);
1352
1353 if (zp->z_acl_cached) {
1354 zfs_acl_free(zp->z_acl_cached);
1355 zp->z_acl_cached = NULL;
1356 }
1357
1358 kmem_cache_free(znode_cache, zp);
1359
1360 VFS_RELE(zfsvfs->z_vfs);
1361 }
1362
1363 void
zfs_tstamp_update_setup(znode_t * zp,uint_t flag,uint64_t mtime[2],uint64_t ctime[2],boolean_t have_tx)1364 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1365 uint64_t ctime[2], boolean_t have_tx)
1366 {
1367 timestruc_t now;
1368
1369 gethrestime(&now);
1370
1371 if (have_tx) { /* will sa_bulk_update happen really soon? */
1372 zp->z_atime_dirty = 0;
1373 zp->z_seq++;
1374 } else {
1375 zp->z_atime_dirty = 1;
1376 }
1377
1378 if (flag & AT_ATIME) {
1379 ZFS_TIME_ENCODE(&now, zp->z_atime);
1380 }
1381
1382 if (flag & AT_MTIME) {
1383 ZFS_TIME_ENCODE(&now, mtime);
1384 if (zp->z_zfsvfs->z_use_fuids) {
1385 zp->z_pflags |= (ZFS_ARCHIVE |
1386 ZFS_AV_MODIFIED);
1387 }
1388 }
1389
1390 if (flag & AT_CTIME) {
1391 ZFS_TIME_ENCODE(&now, ctime);
1392 if (zp->z_zfsvfs->z_use_fuids)
1393 zp->z_pflags |= ZFS_ARCHIVE;
1394 }
1395 }
1396
1397 /*
1398 * Grow the block size for a file.
1399 *
1400 * IN: zp - znode of file to free data in.
1401 * size - requested block size
1402 * tx - open transaction.
1403 *
1404 * NOTE: this function assumes that the znode is write locked.
1405 */
1406 void
zfs_grow_blocksize(znode_t * zp,uint64_t size,dmu_tx_t * tx)1407 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1408 {
1409 int error;
1410 u_longlong_t dummy;
1411
1412 if (size <= zp->z_blksz)
1413 return;
1414 /*
1415 * If the file size is already greater than the current blocksize,
1416 * we will not grow. If there is more than one block in a file,
1417 * the blocksize cannot change.
1418 */
1419 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1420 return;
1421
1422 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
1423 size, 0, tx);
1424
1425 if (error == ENOTSUP)
1426 return;
1427 ASSERT0(error);
1428
1429 /* What blocksize did we actually get? */
1430 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1431 }
1432
1433 /*
1434 * This is a dummy interface used when pvn_vplist_dirty() should *not*
1435 * be calling back into the fs for a putpage(). E.g.: when truncating
1436 * a file, the pages being "thrown away* don't need to be written out.
1437 */
1438 /* ARGSUSED */
1439 static int
zfs_no_putpage(vnode_t * vp,page_t * pp,u_offset_t * offp,size_t * lenp,int flags,cred_t * cr)1440 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
1441 int flags, cred_t *cr)
1442 {
1443 ASSERT(0);
1444 return (0);
1445 }
1446
1447 /*
1448 * Increase the file length
1449 *
1450 * IN: zp - znode of file to free data in.
1451 * end - new end-of-file
1452 *
1453 * RETURN: 0 on success, error code on failure
1454 *
1455 * Assumption: File is already range-locked for changing zp_size
1456 */
1457 static int
zfs_extend(znode_t * zp,uint64_t end)1458 zfs_extend(znode_t *zp, uint64_t end)
1459 {
1460 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1461 dmu_tx_t *tx;
1462 uint64_t newblksz;
1463 int error;
1464
1465 /*
1466 * Nothing to do if file already at desired length.
1467 */
1468 if (end <= zp->z_size)
1469 return (0);
1470
1471 tx = dmu_tx_create(zfsvfs->z_os);
1472 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1473 zfs_sa_upgrade_txholds(tx, zp);
1474 if (end > zp->z_blksz &&
1475 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1476 /*
1477 * We are growing the file past the current block size.
1478 */
1479 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
1480 /*
1481 * File's blocksize is already larger than the
1482 * "recordsize" property. Only let it grow to
1483 * the next power of 2.
1484 */
1485 ASSERT(!ISP2(zp->z_blksz));
1486 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1487 } else {
1488 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
1489 }
1490 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1491 } else {
1492 newblksz = 0;
1493 }
1494
1495 error = dmu_tx_assign(tx, TXG_WAIT);
1496 if (error) {
1497 dmu_tx_abort(tx);
1498 return (error);
1499 }
1500
1501 if (newblksz)
1502 zfs_grow_blocksize(zp, newblksz, tx);
1503
1504 zp->z_size = end;
1505
1506 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
1507 &zp->z_size, sizeof (zp->z_size), tx));
1508
1509 dmu_tx_commit(tx);
1510
1511 return (0);
1512 }
1513
1514 /*
1515 * Free space in a file.
1516 *
1517 * IN: zp - znode of file to free data in.
1518 * off - start of section to free.
1519 * len - length of section to free.
1520 *
1521 * RETURN: 0 on success, error code on failure
1522 *
1523 * Assumption: file is already range-locked for changing zp_size
1524 */
1525 static int
zfs_free_range(znode_t * zp,uint64_t off,uint64_t len)1526 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1527 {
1528 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1529 int error;
1530
1531 /*
1532 * Nothing to do if file already at desired length.
1533 */
1534 if (off >= zp->z_size)
1535 return (0);
1536
1537 if (off + len > zp->z_size)
1538 len = zp->z_size - off;
1539
1540 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1541
1542 return (error);
1543 }
1544
1545 /*
1546 * Truncate a file
1547 *
1548 * IN: zp - znode of file to free data in.
1549 * end - new end-of-file.
1550 *
1551 * RETURN: 0 on success, error code on failure
1552 *
1553 * Assumption: file is already range-locked for changing zp_size
1554 */
1555 static int
zfs_trunc(znode_t * zp,uint64_t end)1556 zfs_trunc(znode_t *zp, uint64_t end)
1557 {
1558 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1559 vnode_t *vp = ZTOV(zp);
1560 dmu_tx_t *tx;
1561 int error;
1562 sa_bulk_attr_t bulk[2];
1563 int count = 0;
1564
1565 /*
1566 * Nothing to do if file already at desired length.
1567 */
1568 if (end >= zp->z_size)
1569 return (0);
1570
1571 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1);
1572 if (error)
1573 return (error);
1574
1575 tx = dmu_tx_create(zfsvfs->z_os);
1576 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1577 zfs_sa_upgrade_txholds(tx, zp);
1578 dmu_tx_mark_netfree(tx);
1579 error = dmu_tx_assign(tx, TXG_WAIT);
1580 if (error) {
1581 dmu_tx_abort(tx);
1582 return (error);
1583 }
1584
1585 zp->z_size = end;
1586 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1587 NULL, &zp->z_size, sizeof (zp->z_size));
1588
1589 if (end == 0) {
1590 zp->z_pflags &= ~ZFS_SPARSE;
1591 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1592 NULL, &zp->z_pflags, 8);
1593 }
1594 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1595
1596 dmu_tx_commit(tx);
1597
1598 /*
1599 * Clear any mapped pages in the truncated region. This has to
1600 * happen outside of the transaction to avoid the possibility of
1601 * a deadlock with someone trying to push a page that we are
1602 * about to invalidate.
1603 */
1604 if (vn_has_cached_data(vp)) {
1605 page_t *pp;
1606 uint64_t start = end & PAGEMASK;
1607 int poff = end & PAGEOFFSET;
1608
1609 if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) {
1610 /*
1611 * We need to zero a partial page.
1612 */
1613 pagezero(pp, poff, PAGESIZE - poff);
1614 start += PAGESIZE;
1615 page_unlock(pp);
1616 }
1617 error = pvn_vplist_dirty(vp, start, zfs_no_putpage,
1618 B_INVAL | B_TRUNC, NULL);
1619 ASSERT(error == 0);
1620 }
1621
1622 return (0);
1623 }
1624
1625 /*
1626 * Free space in a file
1627 *
1628 * IN: zp - znode of file to free data in.
1629 * off - start of range
1630 * len - end of range (0 => EOF)
1631 * flag - current file open mode flags.
1632 * log - TRUE if this action should be logged
1633 *
1634 * RETURN: 0 on success, error code on failure
1635 */
1636 int
zfs_freesp(znode_t * zp,uint64_t off,uint64_t len,int flag,boolean_t log)1637 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1638 {
1639 vnode_t *vp = ZTOV(zp);
1640 dmu_tx_t *tx;
1641 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1642 zilog_t *zilog = zfsvfs->z_log;
1643 uint64_t mode;
1644 uint64_t mtime[2], ctime[2];
1645 sa_bulk_attr_t bulk[3];
1646 int count = 0;
1647 int error;
1648 rl_t *rl;
1649
1650 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1651 sizeof (mode))) != 0)
1652 return (error);
1653
1654 if (off > zp->z_size) {
1655 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1656 error = zfs_extend(zp, off+len);
1657 if (error == 0 && log)
1658 goto log;
1659
1660 zfs_range_unlock(rl);
1661 return (error);
1662 }
1663
1664 /*
1665 * Check for any locks in the region to be freed.
1666 */
1667 if (MANDLOCK(vp, (mode_t)mode)) {
1668 uint64_t length = (len ? len : zp->z_size - off);
1669 if (error = chklock(vp, FWRITE, off, length, flag, NULL))
1670 return (error);
1671 }
1672
1673 if (len == 0 || off + len > zp->z_size) {
1674 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1675 } else {
1676 ssize_t lock_off;
1677 ssize_t lock_len;
1678 #ifdef _KERNEL
1679 if (rz_zev_active()) {
1680 /* start of this megabyte */
1681 lock_off = P2ALIGN(off, ZEV_L1_SIZE);
1682 /* full megabytes */
1683 lock_len = len + (off - lock_off);
1684 lock_len = P2ROUNDUP(lock_len, ZEV_L1_SIZE);
1685 } else {
1686 lock_off = off;
1687 lock_len = len;
1688 }
1689 #else
1690 lock_off = off;
1691 lock_len = len;
1692 #endif
1693 rl = zfs_range_lock(zp, lock_off, lock_len, RL_WRITER);
1694 }
1695
1696 if (len == 0) {
1697 error = zfs_trunc(zp, off);
1698 } else {
1699 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1700 off + len > zp->z_size)
1701 error = zfs_extend(zp, off+len);
1702 }
1703
1704 if (error || !log) {
1705 zfs_range_unlock(rl);
1706 return (error);
1707 }
1708 log:
1709 tx = dmu_tx_create(zfsvfs->z_os);
1710 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1711 zfs_sa_upgrade_txholds(tx, zp);
1712 error = dmu_tx_assign(tx, TXG_WAIT);
1713 if (error) {
1714 dmu_tx_abort(tx);
1715 zfs_range_unlock(rl);
1716 return (error);
1717 }
1718
1719 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1720 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1721 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1722 NULL, &zp->z_pflags, 8);
1723 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
1724 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1725 ASSERT(error == 0);
1726
1727 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1728 zfs_range_unlock(rl);
1729
1730 dmu_tx_commit(tx);
1731 return (0);
1732 }
1733
1734 void
zfs_create_fs(objset_t * os,cred_t * cr,nvlist_t * zplprops,dmu_tx_t * tx)1735 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1736 {
1737 uint64_t moid, obj, sa_obj, version;
1738 uint64_t sense = ZFS_CASE_SENSITIVE;
1739 uint64_t norm = 0;
1740 nvpair_t *elem;
1741 int error;
1742 int i;
1743 znode_t *rootzp = NULL;
1744 zfsvfs_t *zfsvfs;
1745 vnode_t *vp;
1746 vattr_t vattr;
1747 znode_t *zp;
1748 zfs_acl_ids_t acl_ids;
1749
1750 /*
1751 * First attempt to create master node.
1752 */
1753 /*
1754 * In an empty objset, there are no blocks to read and thus
1755 * there can be no i/o errors (which we assert below).
1756 */
1757 moid = MASTER_NODE_OBJ;
1758 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1759 DMU_OT_NONE, 0, tx);
1760 ASSERT(error == 0);
1761
1762 /*
1763 * Set starting attributes.
1764 */
1765 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1766 elem = NULL;
1767 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1768 /* For the moment we expect all zpl props to be uint64_ts */
1769 uint64_t val;
1770 char *name;
1771
1772 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1773 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1774 name = nvpair_name(elem);
1775 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1776 if (val < version)
1777 version = val;
1778 } else {
1779 error = zap_update(os, moid, name, 8, 1, &val, tx);
1780 }
1781 ASSERT(error == 0);
1782 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1783 norm = val;
1784 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1785 sense = val;
1786 }
1787 ASSERT(version != 0);
1788 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1789
1790 /*
1791 * Create zap object used for SA attribute registration
1792 */
1793
1794 if (version >= ZPL_VERSION_SA) {
1795 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1796 DMU_OT_NONE, 0, tx);
1797 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1798 ASSERT(error == 0);
1799 } else {
1800 sa_obj = 0;
1801 }
1802 /*
1803 * Create a delete queue.
1804 */
1805 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1806
1807 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1808 ASSERT(error == 0);
1809
1810 /*
1811 * Create root znode. Create minimal znode/vnode/zfsvfs
1812 * to allow zfs_mknode to work.
1813 */
1814 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
1815 vattr.va_type = VDIR;
1816 vattr.va_mode = S_IFDIR|0755;
1817 vattr.va_uid = crgetuid(cr);
1818 vattr.va_gid = crgetgid(cr);
1819
1820 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1821 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
1822 rootzp->z_moved = 0;
1823 rootzp->z_unlinked = 0;
1824 rootzp->z_atime_dirty = 0;
1825 rootzp->z_is_sa = USE_SA(version, os);
1826
1827 vp = ZTOV(rootzp);
1828 vn_reinit(vp);
1829 vp->v_type = VDIR;
1830
1831 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1832 zfsvfs->z_os = os;
1833 zfsvfs->z_parent = zfsvfs;
1834 zfsvfs->z_version = version;
1835 zfsvfs->z_use_fuids = USE_FUIDS(version, os);
1836 zfsvfs->z_use_sa = USE_SA(version, os);
1837 zfsvfs->z_norm = norm;
1838
1839 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1840 &zfsvfs->z_attr_table);
1841
1842 ASSERT(error == 0);
1843
1844 /*
1845 * Fold case on file systems that are always or sometimes case
1846 * insensitive.
1847 */
1848 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1849 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
1850
1851 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1852 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1853 offsetof(znode_t, z_link_node));
1854
1855 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1856 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1857
1858 rootzp->z_zfsvfs = zfsvfs;
1859 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1860 cr, NULL, &acl_ids));
1861 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1862 ASSERT3P(zp, ==, rootzp);
1863 ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */
1864 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1865 ASSERT(error == 0);
1866 zfs_acl_ids_free(&acl_ids);
1867 POINTER_INVALIDATE(&rootzp->z_zfsvfs);
1868
1869 ZTOV(rootzp)->v_count = 0;
1870 sa_handle_destroy(rootzp->z_sa_hdl);
1871 kmem_cache_free(znode_cache, rootzp);
1872
1873 /*
1874 * Create shares directory
1875 */
1876
1877 error = zfs_create_share_dir(zfsvfs, tx);
1878
1879 ASSERT(error == 0);
1880
1881 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1882 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1883 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1884 }
1885
1886 #endif /* _KERNEL */
1887
1888 static int
zfs_sa_setup(objset_t * osp,sa_attr_type_t ** sa_table)1889 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1890 {
1891 uint64_t sa_obj = 0;
1892 int error;
1893
1894 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1895 if (error != 0 && error != ENOENT)
1896 return (error);
1897
1898 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1899 return (error);
1900 }
1901
1902 static int
zfs_grab_sa_handle(objset_t * osp,uint64_t obj,sa_handle_t ** hdlp,dmu_buf_t ** db,void * tag)1903 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
1904 dmu_buf_t **db, void *tag)
1905 {
1906 dmu_object_info_t doi;
1907 int error;
1908
1909 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
1910 return (error);
1911
1912 dmu_object_info_from_db(*db, &doi);
1913 if ((doi.doi_bonus_type != DMU_OT_SA &&
1914 doi.doi_bonus_type != DMU_OT_ZNODE) ||
1915 doi.doi_bonus_type == DMU_OT_ZNODE &&
1916 doi.doi_bonus_size < sizeof (znode_phys_t)) {
1917 sa_buf_rele(*db, tag);
1918 return (SET_ERROR(ENOTSUP));
1919 }
1920
1921 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
1922 if (error != 0) {
1923 sa_buf_rele(*db, tag);
1924 return (error);
1925 }
1926
1927 return (0);
1928 }
1929
1930 void
zfs_release_sa_handle(sa_handle_t * hdl,dmu_buf_t * db,void * tag)1931 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
1932 {
1933 sa_handle_destroy(hdl);
1934 sa_buf_rele(db, tag);
1935 }
1936
1937 /*
1938 * Given an object number, return its parent object number and whether
1939 * or not the object is an extended attribute directory.
1940 */
1941 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)1942 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
1943 uint64_t *pobjp, int *is_xattrdir)
1944 {
1945 uint64_t parent;
1946 uint64_t pflags;
1947 uint64_t mode;
1948 uint64_t parent_mode;
1949 sa_bulk_attr_t bulk[3];
1950 sa_handle_t *sa_hdl;
1951 dmu_buf_t *sa_db;
1952 int count = 0;
1953 int error;
1954
1955 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
1956 &parent, sizeof (parent));
1957 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
1958 &pflags, sizeof (pflags));
1959 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
1960 &mode, sizeof (mode));
1961
1962 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
1963 return (error);
1964
1965 /*
1966 * When a link is removed its parent pointer is not changed and will
1967 * be invalid. There are two cases where a link is removed but the
1968 * file stays around, when it goes to the delete queue and when there
1969 * are additional links.
1970 */
1971 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
1972 if (error != 0)
1973 return (error);
1974
1975 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
1976 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
1977 if (error != 0)
1978 return (error);
1979
1980 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
1981
1982 /*
1983 * Extended attributes can be applied to files, directories, etc.
1984 * Otherwise the parent must be a directory.
1985 */
1986 if (!*is_xattrdir && !S_ISDIR(parent_mode))
1987 return (SET_ERROR(EINVAL));
1988
1989 *pobjp = parent;
1990
1991 return (0);
1992 }
1993
1994 /*
1995 * Given an object number, return some zpl level statistics
1996 */
1997 static int
zfs_obj_to_stats_impl(sa_handle_t * hdl,sa_attr_type_t * sa_table,zfs_stat_t * sb)1998 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
1999 zfs_stat_t *sb)
2000 {
2001 sa_bulk_attr_t bulk[4];
2002 int count = 0;
2003
2004 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2005 &sb->zs_mode, sizeof (sb->zs_mode));
2006 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
2007 &sb->zs_gen, sizeof (sb->zs_gen));
2008 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
2009 &sb->zs_links, sizeof (sb->zs_links));
2010 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
2011 &sb->zs_ctime, sizeof (sb->zs_ctime));
2012
2013 return (sa_bulk_lookup(hdl, bulk, count));
2014 }
2015
2016 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)2017 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
2018 sa_attr_type_t *sa_table, char *buf, int len)
2019 {
2020 sa_handle_t *sa_hdl;
2021 sa_handle_t *prevhdl = NULL;
2022 dmu_buf_t *prevdb = NULL;
2023 dmu_buf_t *sa_db = NULL;
2024 char *path = buf + len - 1;
2025 int error;
2026
2027 *path = '\0';
2028 sa_hdl = hdl;
2029
2030 for (;;) {
2031 uint64_t pobj;
2032 char component[MAXNAMELEN + 2];
2033 size_t complen;
2034 int is_xattrdir;
2035
2036 if (prevdb)
2037 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
2038
2039 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
2040 &is_xattrdir)) != 0)
2041 break;
2042
2043 if (pobj == obj) {
2044 if (path[0] != '/')
2045 *--path = '/';
2046 break;
2047 }
2048
2049 component[0] = '/';
2050 if (is_xattrdir) {
2051 (void) sprintf(component + 1, "<xattrdir>");
2052 } else {
2053 error = zap_value_search(osp, pobj, obj,
2054 ZFS_DIRENT_OBJ(-1ULL), component + 1);
2055 if (error != 0)
2056 break;
2057 }
2058
2059 complen = strlen(component);
2060 path -= complen;
2061 ASSERT(path >= buf);
2062 bcopy(component, path, complen);
2063 obj = pobj;
2064
2065 if (sa_hdl != hdl) {
2066 prevhdl = sa_hdl;
2067 prevdb = sa_db;
2068 }
2069 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
2070 if (error != 0) {
2071 sa_hdl = prevhdl;
2072 sa_db = prevdb;
2073 break;
2074 }
2075 }
2076
2077 if (sa_hdl != NULL && sa_hdl != hdl) {
2078 ASSERT(sa_db != NULL);
2079 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2080 }
2081
2082 if (error == 0)
2083 (void) memmove(buf, path, buf + len - path);
2084
2085 return (error);
2086 }
2087
2088 int
zfs_obj_to_path(objset_t * osp,uint64_t obj,char * buf,int len)2089 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
2090 {
2091 sa_attr_type_t *sa_table;
2092 sa_handle_t *hdl;
2093 dmu_buf_t *db;
2094 int error;
2095
2096 error = zfs_sa_setup(osp, &sa_table);
2097 if (error != 0)
2098 return (error);
2099
2100 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2101 if (error != 0)
2102 return (error);
2103
2104 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2105
2106 zfs_release_sa_handle(hdl, db, FTAG);
2107 return (error);
2108 }
2109
2110 int
zfs_obj_to_stats(objset_t * osp,uint64_t obj,zfs_stat_t * sb,char * buf,int len)2111 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
2112 char *buf, int len)
2113 {
2114 char *path = buf + len - 1;
2115 sa_attr_type_t *sa_table;
2116 sa_handle_t *hdl;
2117 dmu_buf_t *db;
2118 int error;
2119
2120 *path = '\0';
2121
2122 error = zfs_sa_setup(osp, &sa_table);
2123 if (error != 0)
2124 return (error);
2125
2126 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2127 if (error != 0)
2128 return (error);
2129
2130 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
2131 if (error != 0) {
2132 zfs_release_sa_handle(hdl, db, FTAG);
2133 return (error);
2134 }
2135
2136 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2137
2138 zfs_release_sa_handle(hdl, db, FTAG);
2139 return (error);
2140 }
2141