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 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
29
30 #ifdef _KERNEL
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/time.h>
34 #include <sys/systm.h>
35 #include <sys/sysmacros.h>
36 #include <sys/resource.h>
37 #include <sys/mntent.h>
38 #include <sys/u8_textprep.h>
39 #include <sys/dsl_dataset.h>
40 #include <sys/vfs.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/atomic.h>
47 #include <sys/zfs_dir.h>
48 #include <sys/zfs_acl.h>
49 #include <sys/zfs_ioctl.h>
50 #include <sys/zfs_rlock.h>
51 #include <sys/zfs_fuid.h>
52 #include <sys/dnode.h>
53 #include <sys/fs/zfs.h>
54 #include <sys/kidmap.h>
55 #endif /* _KERNEL */
56
57 #include <sys/dmu.h>
58 #include <sys/dmu_objset.h>
59 #include <sys/refcount.h>
60 #include <sys/stat.h>
61 #include <sys/zap.h>
62 #include <sys/zfs_znode.h>
63 #include <sys/sa.h>
64 #include <sys/zfs_sa.h>
65 #include <sys/zfs_stat.h>
66 #include <sys/refcount.h>
67
68 #include "zfs_prop.h"
69 #include "zfs_comutil.h"
70
71 /* Used by fstat(1). */
72 SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
73 SYSCTL_NULL_INT_PTR, sizeof(znode_t), "sizeof(znode_t)");
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 extern struct vop_vector zfs_vnodeops;
115 extern struct vop_vector zfs_fifoops;
116 extern struct vop_vector zfs_shareops;
117
118 static int
zfs_znode_cache_constructor(void * buf,void * arg,int kmflags)119 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
120 {
121 znode_t *zp = buf;
122
123 POINTER_INVALIDATE(&zp->z_zfsvfs);
124
125 list_link_init(&zp->z_link_node);
126
127 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
128
129 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
130 avl_create(&zp->z_range_avl, zfs_range_compare,
131 sizeof (rl_t), offsetof(rl_t, r_node));
132
133 zp->z_acl_cached = NULL;
134 zp->z_vnode = NULL;
135 zp->z_moved = 0;
136 return (0);
137 }
138
139 /*ARGSUSED*/
140 static void
zfs_znode_cache_destructor(void * buf,void * arg)141 zfs_znode_cache_destructor(void *buf, void *arg)
142 {
143 znode_t *zp = buf;
144
145 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
146 ASSERT3P(zp->z_vnode, ==, NULL);
147 ASSERT(!list_link_active(&zp->z_link_node));
148 mutex_destroy(&zp->z_acl_lock);
149 avl_destroy(&zp->z_range_avl);
150 mutex_destroy(&zp->z_range_lock);
151
152 ASSERT(zp->z_acl_cached == NULL);
153 }
154
155 #ifdef ZNODE_STATS
156 static struct {
157 uint64_t zms_zfsvfs_invalid;
158 uint64_t zms_zfsvfs_recheck1;
159 uint64_t zms_zfsvfs_unmounted;
160 uint64_t zms_zfsvfs_recheck2;
161 uint64_t zms_obj_held;
162 uint64_t zms_vnode_locked;
163 uint64_t zms_not_only_dnlc;
164 } znode_move_stats;
165 #endif /* ZNODE_STATS */
166
167 #ifdef illumos
168 static void
zfs_znode_move_impl(znode_t * ozp,znode_t * nzp)169 zfs_znode_move_impl(znode_t *ozp, znode_t *nzp)
170 {
171 vnode_t *vp;
172
173 /* Copy fields. */
174 nzp->z_zfsvfs = ozp->z_zfsvfs;
175
176 /* Swap vnodes. */
177 vp = nzp->z_vnode;
178 nzp->z_vnode = ozp->z_vnode;
179 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */
180 ZTOV(ozp)->v_data = ozp;
181 ZTOV(nzp)->v_data = nzp;
182
183 nzp->z_id = ozp->z_id;
184 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */
185 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0);
186 nzp->z_unlinked = ozp->z_unlinked;
187 nzp->z_atime_dirty = ozp->z_atime_dirty;
188 nzp->z_zn_prefetch = ozp->z_zn_prefetch;
189 nzp->z_blksz = ozp->z_blksz;
190 nzp->z_seq = ozp->z_seq;
191 nzp->z_mapcnt = ozp->z_mapcnt;
192 nzp->z_gen = ozp->z_gen;
193 nzp->z_sync_cnt = ozp->z_sync_cnt;
194 nzp->z_is_sa = ozp->z_is_sa;
195 nzp->z_sa_hdl = ozp->z_sa_hdl;
196 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2);
197 nzp->z_links = ozp->z_links;
198 nzp->z_size = ozp->z_size;
199 nzp->z_pflags = ozp->z_pflags;
200 nzp->z_uid = ozp->z_uid;
201 nzp->z_gid = ozp->z_gid;
202 nzp->z_mode = ozp->z_mode;
203
204 /*
205 * Since this is just an idle znode and kmem is already dealing with
206 * memory pressure, release any cached ACL.
207 */
208 if (ozp->z_acl_cached) {
209 zfs_acl_free(ozp->z_acl_cached);
210 ozp->z_acl_cached = NULL;
211 }
212
213 sa_set_userp(nzp->z_sa_hdl, nzp);
214
215 /*
216 * Invalidate the original znode by clearing fields that provide a
217 * pointer back to the znode. Set the low bit of the vfs pointer to
218 * ensure that zfs_znode_move() recognizes the znode as invalid in any
219 * subsequent callback.
220 */
221 ozp->z_sa_hdl = NULL;
222 POINTER_INVALIDATE(&ozp->z_zfsvfs);
223
224 /*
225 * Mark the znode.
226 */
227 nzp->z_moved = 1;
228 ozp->z_moved = (uint8_t)-1;
229 }
230
231 /*ARGSUSED*/
232 static kmem_cbrc_t
zfs_znode_move(void * buf,void * newbuf,size_t size,void * arg)233 zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg)
234 {
235 znode_t *ozp = buf, *nzp = newbuf;
236 zfsvfs_t *zfsvfs;
237 vnode_t *vp;
238
239 /*
240 * The znode is on the file system's list of known znodes if the vfs
241 * pointer is valid. We set the low bit of the vfs pointer when freeing
242 * the znode to invalidate it, and the memory patterns written by kmem
243 * (baddcafe and deadbeef) set at least one of the two low bits. A newly
244 * created znode sets the vfs pointer last of all to indicate that the
245 * znode is known and in a valid state to be moved by this function.
246 */
247 zfsvfs = ozp->z_zfsvfs;
248 if (!POINTER_IS_VALID(zfsvfs)) {
249 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid);
250 return (KMEM_CBRC_DONT_KNOW);
251 }
252
253 /*
254 * Close a small window in which it's possible that the filesystem could
255 * be unmounted and freed, and zfsvfs, though valid in the previous
256 * statement, could point to unrelated memory by the time we try to
257 * prevent the filesystem from being unmounted.
258 */
259 rw_enter(&zfsvfs_lock, RW_WRITER);
260 if (zfsvfs != ozp->z_zfsvfs) {
261 rw_exit(&zfsvfs_lock);
262 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1);
263 return (KMEM_CBRC_DONT_KNOW);
264 }
265
266 /*
267 * If the znode is still valid, then so is the file system. We know that
268 * no valid file system can be freed while we hold zfsvfs_lock, so we
269 * can safely ensure that the filesystem is not and will not be
270 * unmounted. The next statement is equivalent to ZFS_ENTER().
271 */
272 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG);
273 if (zfsvfs->z_unmounted) {
274 ZFS_EXIT(zfsvfs);
275 rw_exit(&zfsvfs_lock);
276 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted);
277 return (KMEM_CBRC_DONT_KNOW);
278 }
279 rw_exit(&zfsvfs_lock);
280
281 mutex_enter(&zfsvfs->z_znodes_lock);
282 /*
283 * Recheck the vfs pointer in case the znode was removed just before
284 * acquiring the lock.
285 */
286 if (zfsvfs != ozp->z_zfsvfs) {
287 mutex_exit(&zfsvfs->z_znodes_lock);
288 ZFS_EXIT(zfsvfs);
289 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2);
290 return (KMEM_CBRC_DONT_KNOW);
291 }
292
293 /*
294 * At this point we know that as long as we hold z_znodes_lock, the
295 * znode cannot be freed and fields within the znode can be safely
296 * accessed. Now, prevent a race with zfs_zget().
297 */
298 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) {
299 mutex_exit(&zfsvfs->z_znodes_lock);
300 ZFS_EXIT(zfsvfs);
301 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held);
302 return (KMEM_CBRC_LATER);
303 }
304
305 vp = ZTOV(ozp);
306 if (mutex_tryenter(&vp->v_lock) == 0) {
307 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
308 mutex_exit(&zfsvfs->z_znodes_lock);
309 ZFS_EXIT(zfsvfs);
310 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked);
311 return (KMEM_CBRC_LATER);
312 }
313
314 /* Only move znodes that are referenced _only_ by the DNLC. */
315 if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
316 mutex_exit(&vp->v_lock);
317 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
318 mutex_exit(&zfsvfs->z_znodes_lock);
319 ZFS_EXIT(zfsvfs);
320 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc);
321 return (KMEM_CBRC_LATER);
322 }
323
324 /*
325 * The znode is known and in a valid state to move. We're holding the
326 * locks needed to execute the critical section.
327 */
328 zfs_znode_move_impl(ozp, nzp);
329 mutex_exit(&vp->v_lock);
330 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
331
332 list_link_replace(&ozp->z_link_node, &nzp->z_link_node);
333 mutex_exit(&zfsvfs->z_znodes_lock);
334 ZFS_EXIT(zfsvfs);
335
336 return (KMEM_CBRC_YES);
337 }
338 #endif /* illumos */
339
340 void
zfs_znode_init(void)341 zfs_znode_init(void)
342 {
343 /*
344 * Initialize zcache
345 */
346 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
347 ASSERT(znode_cache == NULL);
348 znode_cache = kmem_cache_create("zfs_znode_cache",
349 sizeof (znode_t), 0, zfs_znode_cache_constructor,
350 zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
351 kmem_cache_set_move(znode_cache, zfs_znode_move);
352 }
353
354 void
zfs_znode_fini(void)355 zfs_znode_fini(void)
356 {
357 #ifdef illumos
358 /*
359 * Cleanup vfs & vnode ops
360 */
361 zfs_remove_op_tables();
362 #endif
363
364 /*
365 * Cleanup zcache
366 */
367 if (znode_cache)
368 kmem_cache_destroy(znode_cache);
369 znode_cache = NULL;
370 rw_destroy(&zfsvfs_lock);
371 }
372
373 #ifdef illumos
374 struct vnodeops *zfs_dvnodeops;
375 struct vnodeops *zfs_fvnodeops;
376 struct vnodeops *zfs_symvnodeops;
377 struct vnodeops *zfs_xdvnodeops;
378 struct vnodeops *zfs_evnodeops;
379 struct vnodeops *zfs_sharevnodeops;
380
381 void
zfs_remove_op_tables()382 zfs_remove_op_tables()
383 {
384 /*
385 * Remove vfs ops
386 */
387 ASSERT(zfsfstype);
388 (void) vfs_freevfsops_by_type(zfsfstype);
389 zfsfstype = 0;
390
391 /*
392 * Remove vnode ops
393 */
394 if (zfs_dvnodeops)
395 vn_freevnodeops(zfs_dvnodeops);
396 if (zfs_fvnodeops)
397 vn_freevnodeops(zfs_fvnodeops);
398 if (zfs_symvnodeops)
399 vn_freevnodeops(zfs_symvnodeops);
400 if (zfs_xdvnodeops)
401 vn_freevnodeops(zfs_xdvnodeops);
402 if (zfs_evnodeops)
403 vn_freevnodeops(zfs_evnodeops);
404 if (zfs_sharevnodeops)
405 vn_freevnodeops(zfs_sharevnodeops);
406
407 zfs_dvnodeops = NULL;
408 zfs_fvnodeops = NULL;
409 zfs_symvnodeops = NULL;
410 zfs_xdvnodeops = NULL;
411 zfs_evnodeops = NULL;
412 zfs_sharevnodeops = NULL;
413 }
414
415 extern const fs_operation_def_t zfs_dvnodeops_template[];
416 extern const fs_operation_def_t zfs_fvnodeops_template[];
417 extern const fs_operation_def_t zfs_xdvnodeops_template[];
418 extern const fs_operation_def_t zfs_symvnodeops_template[];
419 extern const fs_operation_def_t zfs_evnodeops_template[];
420 extern const fs_operation_def_t zfs_sharevnodeops_template[];
421
422 int
zfs_create_op_tables()423 zfs_create_op_tables()
424 {
425 int error;
426
427 /*
428 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs()
429 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv).
430 * In this case we just return as the ops vectors are already set up.
431 */
432 if (zfs_dvnodeops)
433 return (0);
434
435 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template,
436 &zfs_dvnodeops);
437 if (error)
438 return (error);
439
440 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template,
441 &zfs_fvnodeops);
442 if (error)
443 return (error);
444
445 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template,
446 &zfs_symvnodeops);
447 if (error)
448 return (error);
449
450 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template,
451 &zfs_xdvnodeops);
452 if (error)
453 return (error);
454
455 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template,
456 &zfs_evnodeops);
457 if (error)
458 return (error);
459
460 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template,
461 &zfs_sharevnodeops);
462
463 return (error);
464 }
465 #endif /* illumos */
466
467 int
zfs_create_share_dir(zfsvfs_t * zfsvfs,dmu_tx_t * tx)468 zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
469 {
470 zfs_acl_ids_t acl_ids;
471 vattr_t vattr;
472 znode_t *sharezp;
473 znode_t *zp;
474 int error;
475
476 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
477 vattr.va_type = VDIR;
478 vattr.va_mode = S_IFDIR|0555;
479 vattr.va_uid = crgetuid(kcred);
480 vattr.va_gid = crgetgid(kcred);
481
482 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
483 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
484 sharezp->z_moved = 0;
485 sharezp->z_unlinked = 0;
486 sharezp->z_atime_dirty = 0;
487 sharezp->z_zfsvfs = zfsvfs;
488 sharezp->z_is_sa = zfsvfs->z_use_sa;
489
490 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
491 kcred, NULL, &acl_ids));
492 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
493 ASSERT3P(zp, ==, sharezp);
494 POINTER_INVALIDATE(&sharezp->z_zfsvfs);
495 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
496 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
497 zfsvfs->z_shares_dir = sharezp->z_id;
498
499 zfs_acl_ids_free(&acl_ids);
500 sa_handle_destroy(sharezp->z_sa_hdl);
501 kmem_cache_free(znode_cache, sharezp);
502
503 return (error);
504 }
505
506 /*
507 * define a couple of values we need available
508 * for both 64 and 32 bit environments.
509 */
510 #ifndef NBITSMINOR64
511 #define NBITSMINOR64 32
512 #endif
513 #ifndef MAXMAJ64
514 #define MAXMAJ64 0xffffffffUL
515 #endif
516 #ifndef MAXMIN64
517 #define MAXMIN64 0xffffffffUL
518 #endif
519
520 /*
521 * Create special expldev for ZFS private use.
522 * Can't use standard expldev since it doesn't do
523 * what we want. The standard expldev() takes a
524 * dev32_t in LP64 and expands it to a long dev_t.
525 * We need an interface that takes a dev32_t in ILP32
526 * and expands it to a long dev_t.
527 */
528 static uint64_t
zfs_expldev(dev_t dev)529 zfs_expldev(dev_t dev)
530 {
531 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev));
532 }
533 /*
534 * Special cmpldev for ZFS private use.
535 * Can't use standard cmpldev since it takes
536 * a long dev_t and compresses it to dev32_t in
537 * LP64. We need to do a compaction of a long dev_t
538 * to a dev32_t in ILP32.
539 */
540 dev_t
zfs_cmpldev(uint64_t dev)541 zfs_cmpldev(uint64_t dev)
542 {
543 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64)));
544 }
545
546 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)547 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
548 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
549 {
550 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs));
551 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));
552
553 ASSERT(zp->z_sa_hdl == NULL);
554 ASSERT(zp->z_acl_cached == NULL);
555 if (sa_hdl == NULL) {
556 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
557 SA_HDL_SHARED, &zp->z_sa_hdl));
558 } else {
559 zp->z_sa_hdl = sa_hdl;
560 sa_set_userp(sa_hdl, zp);
561 }
562
563 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
564
565 /*
566 * Slap on VROOT if we are the root znode unless we are the root
567 * node of a snapshot mounted under .zfs.
568 */
569 if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs)
570 ZTOV(zp)->v_flag |= VROOT;
571
572 vn_exists(ZTOV(zp));
573 }
574
575 void
zfs_znode_dmu_fini(znode_t * zp)576 zfs_znode_dmu_fini(znode_t *zp)
577 {
578 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) ||
579 zp->z_unlinked ||
580 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock));
581
582 sa_handle_destroy(zp->z_sa_hdl);
583 zp->z_sa_hdl = NULL;
584 }
585
586 static void
zfs_vnode_forget(vnode_t * vp)587 zfs_vnode_forget(vnode_t *vp)
588 {
589
590 /* copied from insmntque_stddtr */
591 vp->v_data = NULL;
592 vp->v_op = &dead_vnodeops;
593 vgone(vp);
594 vput(vp);
595 }
596
597 /*
598 * Construct a new znode/vnode and intialize.
599 *
600 * This does not do a call to dmu_set_user() that is
601 * up to the caller to do, in case you don't want to
602 * return the znode
603 */
604 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)605 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
606 dmu_object_type_t obj_type, sa_handle_t *hdl)
607 {
608 znode_t *zp;
609 vnode_t *vp;
610 uint64_t mode;
611 uint64_t parent;
612 sa_bulk_attr_t bulk[9];
613 int count = 0;
614 int error;
615
616 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
617
618 KASSERT(curthread->td_vp_reserv > 0,
619 ("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
620 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
621 if (error != 0) {
622 kmem_cache_free(znode_cache, zp);
623 return (NULL);
624 }
625 zp->z_vnode = vp;
626 vp->v_data = zp;
627
628 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
629 zp->z_moved = 0;
630
631 /*
632 * Defer setting z_zfsvfs until the znode is ready to be a candidate for
633 * the zfs_znode_move() callback.
634 */
635 zp->z_sa_hdl = NULL;
636 zp->z_unlinked = 0;
637 zp->z_atime_dirty = 0;
638 zp->z_mapcnt = 0;
639 zp->z_id = db->db_object;
640 zp->z_blksz = blksz;
641 zp->z_seq = 0x7A4653;
642 zp->z_sync_cnt = 0;
643
644 vp = ZTOV(zp);
645
646 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
647
648 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
649 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
650 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
651 &zp->z_size, 8);
652 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
653 &zp->z_links, 8);
654 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
655 &zp->z_pflags, 8);
656 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
657 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
658 &zp->z_atime, 16);
659 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
660 &zp->z_uid, 8);
661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
662 &zp->z_gid, 8);
663
664 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
665 if (hdl == NULL)
666 sa_handle_destroy(zp->z_sa_hdl);
667 zfs_vnode_forget(vp);
668 zp->z_vnode = NULL;
669 kmem_cache_free(znode_cache, zp);
670 return (NULL);
671 }
672
673 zp->z_mode = mode;
674
675 vp->v_type = IFTOVT((mode_t)mode);
676
677 switch (vp->v_type) {
678 case VDIR:
679 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
680 break;
681 #ifdef illumos
682 case VBLK:
683 case VCHR:
684 {
685 uint64_t rdev;
686 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
687 &rdev, sizeof (rdev)) == 0);
688
689 vp->v_rdev = zfs_cmpldev(rdev);
690 }
691 break;
692 #endif
693 case VFIFO:
694 #ifdef illumos
695 case VSOCK:
696 case VDOOR:
697 #endif
698 vp->v_op = &zfs_fifoops;
699 break;
700 case VREG:
701 if (parent == zfsvfs->z_shares_dir) {
702 ASSERT(zp->z_uid == 0 && zp->z_gid == 0);
703 vp->v_op = &zfs_shareops;
704 }
705 break;
706 #ifdef illumos
707 case VLNK:
708 vn_setops(vp, zfs_symvnodeops);
709 break;
710 default:
711 vn_setops(vp, zfs_evnodeops);
712 break;
713 #endif
714 }
715
716 mutex_enter(&zfsvfs->z_znodes_lock);
717 list_insert_tail(&zfsvfs->z_all_znodes, zp);
718 membar_producer();
719 /*
720 * Everything else must be valid before assigning z_zfsvfs makes the
721 * znode eligible for zfs_znode_move().
722 */
723 zp->z_zfsvfs = zfsvfs;
724 mutex_exit(&zfsvfs->z_znodes_lock);
725
726 /*
727 * Acquire vnode lock before making it available to the world.
728 */
729 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
730 VN_LOCK_AREC(vp);
731 if (vp->v_type != VFIFO)
732 VN_LOCK_ASHARE(vp);
733
734 #ifdef illumos
735 VFS_HOLD(zfsvfs->z_vfs);
736 #endif
737 return (zp);
738 }
739
740 static uint64_t empty_xattr;
741 static uint64_t pad[4];
742 static zfs_acl_phys_t acl_phys;
743 /*
744 * Create a new DMU object to hold a zfs znode.
745 *
746 * IN: dzp - parent directory for new znode
747 * vap - file attributes for new znode
748 * tx - dmu transaction id for zap operations
749 * cr - credentials of caller
750 * flag - flags:
751 * IS_ROOT_NODE - new object will be root
752 * IS_XATTR - new object is an attribute
753 * bonuslen - length of bonus buffer
754 * setaclp - File/Dir initial ACL
755 * fuidp - Tracks fuid allocation.
756 *
757 * OUT: zpp - allocated znode
758 *
759 */
760 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)761 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
762 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
763 {
764 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
765 uint64_t mode, size, links, parent, pflags;
766 uint64_t dzp_pflags = 0;
767 uint64_t rdev = 0;
768 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
769 dmu_buf_t *db;
770 timestruc_t now;
771 uint64_t gen, obj;
772 int err;
773 int bonuslen;
774 sa_handle_t *sa_hdl;
775 dmu_object_type_t obj_type;
776 sa_bulk_attr_t sa_attrs[ZPL_END];
777 int cnt = 0;
778 zfs_acl_locator_cb_t locate = { 0 };
779
780 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
781
782 if (zfsvfs->z_replay) {
783 obj = vap->va_nodeid;
784 now = vap->va_ctime; /* see zfs_replay_create() */
785 gen = vap->va_nblocks; /* ditto */
786 } else {
787 obj = 0;
788 vfs_timestamp(&now);
789 gen = dmu_tx_get_txg(tx);
790 }
791
792 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
793 bonuslen = (obj_type == DMU_OT_SA) ?
794 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
795
796 /*
797 * Create a new DMU object.
798 */
799 /*
800 * There's currently no mechanism for pre-reading the blocks that will
801 * be needed to allocate a new object, so we accept the small chance
802 * that there will be an i/o error and we will fail one of the
803 * assertions below.
804 */
805 if (vap->va_type == VDIR) {
806 if (zfsvfs->z_replay) {
807 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj,
808 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
809 obj_type, bonuslen, tx));
810 } else {
811 obj = zap_create_norm(zfsvfs->z_os,
812 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
813 obj_type, bonuslen, tx);
814 }
815 } else {
816 if (zfsvfs->z_replay) {
817 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj,
818 DMU_OT_PLAIN_FILE_CONTENTS, 0,
819 obj_type, bonuslen, tx));
820 } else {
821 obj = dmu_object_alloc(zfsvfs->z_os,
822 DMU_OT_PLAIN_FILE_CONTENTS, 0,
823 obj_type, bonuslen, tx);
824 }
825 }
826
827 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
828 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
829
830 /*
831 * If this is the root, fix up the half-initialized parent pointer
832 * to reference the just-allocated physical data area.
833 */
834 if (flag & IS_ROOT_NODE) {
835 dzp->z_id = obj;
836 } else {
837 dzp_pflags = dzp->z_pflags;
838 }
839
840 /*
841 * If parent is an xattr, so am I.
842 */
843 if (dzp_pflags & ZFS_XATTR) {
844 flag |= IS_XATTR;
845 }
846
847 if (zfsvfs->z_use_fuids)
848 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
849 else
850 pflags = 0;
851
852 if (vap->va_type == VDIR) {
853 size = 2; /* contents ("." and "..") */
854 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
855 } else {
856 size = links = 0;
857 }
858
859 if (vap->va_type == VBLK || vap->va_type == VCHR) {
860 rdev = zfs_expldev(vap->va_rdev);
861 }
862
863 parent = dzp->z_id;
864 mode = acl_ids->z_mode;
865 if (flag & IS_XATTR)
866 pflags |= ZFS_XATTR;
867
868 /*
869 * No execs denied will be deterimed when zfs_mode_compute() is called.
870 */
871 pflags |= acl_ids->z_aclp->z_hints &
872 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
873 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
874
875 ZFS_TIME_ENCODE(&now, crtime);
876 ZFS_TIME_ENCODE(&now, ctime);
877
878 if (vap->va_mask & AT_ATIME) {
879 ZFS_TIME_ENCODE(&vap->va_atime, atime);
880 } else {
881 ZFS_TIME_ENCODE(&now, atime);
882 }
883
884 if (vap->va_mask & AT_MTIME) {
885 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
886 } else {
887 ZFS_TIME_ENCODE(&now, mtime);
888 }
889
890 /* Now add in all of the "SA" attributes */
891 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
892 &sa_hdl));
893
894 /*
895 * Setup the array of attributes to be replaced/set on the new file
896 *
897 * order for DMU_OT_ZNODE is critical since it needs to be constructed
898 * in the old znode_phys_t format. Don't change this ordering
899 */
900
901 if (obj_type == DMU_OT_ZNODE) {
902 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
903 NULL, &atime, 16);
904 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
905 NULL, &mtime, 16);
906 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
907 NULL, &ctime, 16);
908 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
909 NULL, &crtime, 16);
910 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
911 NULL, &gen, 8);
912 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
913 NULL, &mode, 8);
914 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
915 NULL, &size, 8);
916 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
917 NULL, &parent, 8);
918 } else {
919 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
920 NULL, &mode, 8);
921 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
922 NULL, &size, 8);
923 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
924 NULL, &gen, 8);
925 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
926 &acl_ids->z_fuid, 8);
927 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
928 &acl_ids->z_fgid, 8);
929 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
930 NULL, &parent, 8);
931 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
932 NULL, &pflags, 8);
933 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
934 NULL, &atime, 16);
935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
936 NULL, &mtime, 16);
937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
938 NULL, &ctime, 16);
939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
940 NULL, &crtime, 16);
941 }
942
943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
944
945 if (obj_type == DMU_OT_ZNODE) {
946 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
947 &empty_xattr, 8);
948 }
949 if (obj_type == DMU_OT_ZNODE ||
950 (vap->va_type == VBLK || vap->va_type == VCHR)) {
951 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
952 NULL, &rdev, 8);
953
954 }
955 if (obj_type == DMU_OT_ZNODE) {
956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
957 NULL, &pflags, 8);
958 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
959 &acl_ids->z_fuid, 8);
960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
961 &acl_ids->z_fgid, 8);
962 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
963 sizeof (uint64_t) * 4);
964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
965 &acl_phys, sizeof (zfs_acl_phys_t));
966 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
967 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
968 &acl_ids->z_aclp->z_acl_count, 8);
969 locate.cb_aclp = acl_ids->z_aclp;
970 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
971 zfs_acl_data_locator, &locate,
972 acl_ids->z_aclp->z_acl_bytes);
973 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
974 acl_ids->z_fuid, acl_ids->z_fgid);
975 }
976
977 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
978
979 if (!(flag & IS_ROOT_NODE)) {
980 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
981 ASSERT(*zpp != NULL);
982 } else {
983 /*
984 * If we are creating the root node, the "parent" we
985 * passed in is the znode for the root.
986 */
987 *zpp = dzp;
988
989 (*zpp)->z_sa_hdl = sa_hdl;
990 }
991
992 (*zpp)->z_pflags = pflags;
993 (*zpp)->z_mode = mode;
994
995 if (vap->va_mask & AT_XVATTR)
996 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx);
997
998 if (obj_type == DMU_OT_ZNODE ||
999 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
1000 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
1001 }
1002 if (!(flag & IS_ROOT_NODE)) {
1003 vnode_t *vp;
1004
1005 vp = ZTOV(*zpp);
1006 vp->v_vflag |= VV_FORCEINSMQ;
1007 err = insmntque(vp, zfsvfs->z_vfs);
1008 vp->v_vflag &= ~VV_FORCEINSMQ;
1009 KASSERT(err == 0, ("insmntque() failed: error %d", err));
1010 }
1011 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1012 }
1013
1014 /*
1015 * Update in-core attributes. It is assumed the caller will be doing an
1016 * sa_bulk_update to push the changes out.
1017 */
1018 void
zfs_xvattr_set(znode_t * zp,xvattr_t * xvap,dmu_tx_t * tx)1019 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
1020 {
1021 xoptattr_t *xoap;
1022
1023 xoap = xva_getxoptattr(xvap);
1024 ASSERT(xoap);
1025
1026 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
1027 uint64_t times[2];
1028 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
1029 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
1030 ×, sizeof (times), tx);
1031 XVA_SET_RTN(xvap, XAT_CREATETIME);
1032 }
1033 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
1034 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
1035 zp->z_pflags, tx);
1036 XVA_SET_RTN(xvap, XAT_READONLY);
1037 }
1038 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
1039 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
1040 zp->z_pflags, tx);
1041 XVA_SET_RTN(xvap, XAT_HIDDEN);
1042 }
1043 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
1044 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
1045 zp->z_pflags, tx);
1046 XVA_SET_RTN(xvap, XAT_SYSTEM);
1047 }
1048 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
1049 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
1050 zp->z_pflags, tx);
1051 XVA_SET_RTN(xvap, XAT_ARCHIVE);
1052 }
1053 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
1054 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
1055 zp->z_pflags, tx);
1056 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
1057 }
1058 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
1059 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
1060 zp->z_pflags, tx);
1061 XVA_SET_RTN(xvap, XAT_NOUNLINK);
1062 }
1063 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
1064 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
1065 zp->z_pflags, tx);
1066 XVA_SET_RTN(xvap, XAT_APPENDONLY);
1067 }
1068 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
1069 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
1070 zp->z_pflags, tx);
1071 XVA_SET_RTN(xvap, XAT_NODUMP);
1072 }
1073 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
1074 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
1075 zp->z_pflags, tx);
1076 XVA_SET_RTN(xvap, XAT_OPAQUE);
1077 }
1078 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
1079 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
1080 xoap->xoa_av_quarantined, zp->z_pflags, tx);
1081 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
1082 }
1083 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
1084 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
1085 zp->z_pflags, tx);
1086 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
1087 }
1088 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
1089 zfs_sa_set_scanstamp(zp, xvap, tx);
1090 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
1091 }
1092 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
1093 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
1094 zp->z_pflags, tx);
1095 XVA_SET_RTN(xvap, XAT_REPARSE);
1096 }
1097 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
1098 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
1099 zp->z_pflags, tx);
1100 XVA_SET_RTN(xvap, XAT_OFFLINE);
1101 }
1102 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
1103 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
1104 zp->z_pflags, tx);
1105 XVA_SET_RTN(xvap, XAT_SPARSE);
1106 }
1107 }
1108
1109 int
zfs_zget(zfsvfs_t * zfsvfs,uint64_t obj_num,znode_t ** zpp)1110 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
1111 {
1112 dmu_object_info_t doi;
1113 dmu_buf_t *db;
1114 znode_t *zp;
1115 vnode_t *vp;
1116 sa_handle_t *hdl;
1117 struct thread *td;
1118 int locked;
1119 int err;
1120
1121 td = curthread;
1122 getnewvnode_reserve(1);
1123 again:
1124 *zpp = NULL;
1125 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1126
1127 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1128 if (err) {
1129 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1130 getnewvnode_drop_reserve();
1131 return (err);
1132 }
1133
1134 dmu_object_info_from_db(db, &doi);
1135 if (doi.doi_bonus_type != DMU_OT_SA &&
1136 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1137 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1138 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1139 sa_buf_rele(db, NULL);
1140 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1141 #ifdef __FreeBSD__
1142 getnewvnode_drop_reserve();
1143 #endif
1144 return (SET_ERROR(EINVAL));
1145 }
1146
1147 hdl = dmu_buf_get_user(db);
1148 if (hdl != NULL) {
1149 zp = sa_get_userdata(hdl);
1150
1151 /*
1152 * Since "SA" does immediate eviction we
1153 * should never find a sa handle that doesn't
1154 * know about the znode.
1155 */
1156 ASSERT3P(zp, !=, NULL);
1157 ASSERT3U(zp->z_id, ==, obj_num);
1158 if (zp->z_unlinked) {
1159 err = SET_ERROR(ENOENT);
1160 } else {
1161 vp = ZTOV(zp);
1162 /*
1163 * Don't let the vnode disappear after
1164 * ZFS_OBJ_HOLD_EXIT.
1165 */
1166 VN_HOLD(vp);
1167 *zpp = zp;
1168 err = 0;
1169 }
1170
1171 sa_buf_rele(db, NULL);
1172 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1173
1174 if (err) {
1175 getnewvnode_drop_reserve();
1176 return (err);
1177 }
1178
1179 locked = VOP_ISLOCKED(vp);
1180 VI_LOCK(vp);
1181 if ((vp->v_iflag & VI_DOOMED) != 0 &&
1182 locked != LK_EXCLUSIVE) {
1183 /*
1184 * The vnode is doomed and this thread doesn't
1185 * hold the exclusive lock on it, so the vnode
1186 * must be being reclaimed by another thread.
1187 * Otherwise the doomed vnode is being reclaimed
1188 * by this thread and zfs_zget is called from
1189 * ZIL internals.
1190 */
1191 VI_UNLOCK(vp);
1192
1193 /*
1194 * XXX vrele() locks the vnode when the last reference
1195 * is dropped. Although in this case the vnode is
1196 * doomed / dead and so no inactivation is required,
1197 * the vnode lock is still acquired. That could result
1198 * in a LOR with z_teardown_lock if another thread holds
1199 * the vnode's lock and tries to take z_teardown_lock.
1200 * But that is only possible if the other thread peforms
1201 * a ZFS vnode operation on the vnode. That either
1202 * should not happen if the vnode is dead or the thread
1203 * should also have a refrence to the vnode and thus
1204 * our reference is not last.
1205 */
1206 VN_RELE(vp);
1207 goto again;
1208 }
1209 VI_UNLOCK(vp);
1210 getnewvnode_drop_reserve();
1211 return (err);
1212 }
1213
1214 /*
1215 * Not found create new znode/vnode
1216 * but only if file exists.
1217 *
1218 * There is a small window where zfs_vget() could
1219 * find this object while a file create is still in
1220 * progress. This is checked for in zfs_znode_alloc()
1221 *
1222 * if zfs_znode_alloc() fails it will drop the hold on the
1223 * bonus buffer.
1224 */
1225 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
1226 doi.doi_bonus_type, NULL);
1227 if (zp == NULL) {
1228 err = SET_ERROR(ENOENT);
1229 } else {
1230 *zpp = zp;
1231 }
1232 if (err == 0) {
1233 vnode_t *vp = ZTOV(zp);
1234
1235 err = insmntque(vp, zfsvfs->z_vfs);
1236 if (err == 0) {
1237 vp->v_hash = obj_num;
1238 VOP_UNLOCK(vp, 0);
1239 } else {
1240 zp->z_vnode = NULL;
1241 zfs_znode_dmu_fini(zp);
1242 zfs_znode_free(zp);
1243 *zpp = NULL;
1244 }
1245 }
1246 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1247 getnewvnode_drop_reserve();
1248 return (err);
1249 }
1250
1251 int
zfs_rezget(znode_t * zp)1252 zfs_rezget(znode_t *zp)
1253 {
1254 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1255 dmu_object_info_t doi;
1256 dmu_buf_t *db;
1257 vnode_t *vp;
1258 uint64_t obj_num = zp->z_id;
1259 uint64_t mode, size;
1260 sa_bulk_attr_t bulk[8];
1261 int err;
1262 int count = 0;
1263 uint64_t gen;
1264
1265 /*
1266 * Remove cached pages before reloading the znode, so that they are not
1267 * lingering after we run into any error. Ideally, we should vgone()
1268 * the vnode in case of error, but currently we cannot do that
1269 * because of the LOR between the vnode lock and z_teardown_lock.
1270 * So, instead, we have to "doom" the znode in the illumos style.
1271 */
1272 vp = ZTOV(zp);
1273 vn_pages_remove(vp, 0, 0);
1274
1275 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1276
1277 mutex_enter(&zp->z_acl_lock);
1278 if (zp->z_acl_cached) {
1279 zfs_acl_free(zp->z_acl_cached);
1280 zp->z_acl_cached = NULL;
1281 }
1282
1283 mutex_exit(&zp->z_acl_lock);
1284 ASSERT(zp->z_sa_hdl == NULL);
1285 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1286 if (err) {
1287 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1288 return (err);
1289 }
1290
1291 dmu_object_info_from_db(db, &doi);
1292 if (doi.doi_bonus_type != DMU_OT_SA &&
1293 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1294 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1295 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1296 sa_buf_rele(db, NULL);
1297 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1298 return (SET_ERROR(EINVAL));
1299 }
1300
1301 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1302 size = zp->z_size;
1303
1304 /* reload cached values */
1305 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1306 &gen, sizeof (gen));
1307 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1308 &zp->z_size, sizeof (zp->z_size));
1309 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1310 &zp->z_links, sizeof (zp->z_links));
1311 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1312 &zp->z_pflags, sizeof (zp->z_pflags));
1313 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1314 &zp->z_atime, sizeof (zp->z_atime));
1315 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1316 &zp->z_uid, sizeof (zp->z_uid));
1317 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1318 &zp->z_gid, sizeof (zp->z_gid));
1319 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1320 &mode, sizeof (mode));
1321
1322 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1323 zfs_znode_dmu_fini(zp);
1324 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1325 return (SET_ERROR(EIO));
1326 }
1327
1328 zp->z_mode = mode;
1329
1330 if (gen != zp->z_gen) {
1331 zfs_znode_dmu_fini(zp);
1332 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1333 return (SET_ERROR(EIO));
1334 }
1335
1336 /*
1337 * It is highly improbable but still quite possible that two
1338 * objects in different datasets are created with the same
1339 * object numbers and in transaction groups with the same
1340 * numbers. znodes corresponding to those objects would
1341 * have the same z_id and z_gen, but their other attributes
1342 * may be different.
1343 * zfs recv -F may replace one of such objects with the other.
1344 * As a result file properties recorded in the replaced
1345 * object's vnode may no longer match the received object's
1346 * properties. At present the only cached property is the
1347 * files type recorded in v_type.
1348 * So, handle this case by leaving the old vnode and znode
1349 * disassociated from the actual object. A new vnode and a
1350 * znode will be created if the object is accessed
1351 * (e.g. via a look-up). The old vnode and znode will be
1352 * recycled when the last vnode reference is dropped.
1353 */
1354 if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) {
1355 zfs_znode_dmu_fini(zp);
1356 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1357 return (SET_ERROR(EIO));
1358 }
1359
1360 /*
1361 * If the file has zero links, then it has been unlinked on the send
1362 * side and it must be in the received unlinked set.
1363 * We call zfs_znode_dmu_fini() now to prevent any accesses to the
1364 * stale data and to prevent automatical removal of the file in
1365 * zfs_zinactive(). The file will be removed either when it is removed
1366 * on the send side and the next incremental stream is received or
1367 * when the unlinked set gets processed.
1368 */
1369 zp->z_unlinked = (zp->z_links == 0);
1370 if (zp->z_unlinked) {
1371 zfs_znode_dmu_fini(zp);
1372 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1373 return (0);
1374 }
1375
1376 zp->z_blksz = doi.doi_data_block_size;
1377 if (zp->z_size != size)
1378 vnode_pager_setsize(vp, zp->z_size);
1379
1380 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1381
1382 return (0);
1383 }
1384
1385 void
zfs_znode_delete(znode_t * zp,dmu_tx_t * tx)1386 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1387 {
1388 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1389 objset_t *os = zfsvfs->z_os;
1390 uint64_t obj = zp->z_id;
1391 uint64_t acl_obj = zfs_external_acl(zp);
1392
1393 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
1394 if (acl_obj) {
1395 VERIFY(!zp->z_is_sa);
1396 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1397 }
1398 VERIFY(0 == dmu_object_free(os, obj, tx));
1399 zfs_znode_dmu_fini(zp);
1400 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1401 zfs_znode_free(zp);
1402 }
1403
1404 void
zfs_zinactive(znode_t * zp)1405 zfs_zinactive(znode_t *zp)
1406 {
1407 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1408 uint64_t z_id = zp->z_id;
1409
1410 ASSERT(zp->z_sa_hdl);
1411
1412 /*
1413 * Don't allow a zfs_zget() while were trying to release this znode
1414 */
1415 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
1416
1417 /*
1418 * If this was the last reference to a file with no links, remove
1419 * the file from the file system unless the file system is mounted
1420 * read-only. That can happen, for example, if the file system was
1421 * originally read-write, the file was opened, then unlinked and
1422 * the file system was made read-only before the file was finally
1423 * closed. The file will remain in the unlinked set.
1424 */
1425 if (zp->z_unlinked) {
1426 ASSERT(!zfsvfs->z_issnap);
1427 if ((zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) == 0) {
1428 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1429 zfs_rmnode(zp);
1430 return;
1431 }
1432 }
1433
1434 zfs_znode_dmu_fini(zp);
1435 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1436 zfs_znode_free(zp);
1437 }
1438
1439 void
zfs_znode_free(znode_t * zp)1440 zfs_znode_free(znode_t *zp)
1441 {
1442 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1443
1444 ASSERT(zp->z_sa_hdl == NULL);
1445 zp->z_vnode = NULL;
1446 mutex_enter(&zfsvfs->z_znodes_lock);
1447 POINTER_INVALIDATE(&zp->z_zfsvfs);
1448 list_remove(&zfsvfs->z_all_znodes, zp);
1449 mutex_exit(&zfsvfs->z_znodes_lock);
1450
1451 if (zp->z_acl_cached) {
1452 zfs_acl_free(zp->z_acl_cached);
1453 zp->z_acl_cached = NULL;
1454 }
1455
1456 kmem_cache_free(znode_cache, zp);
1457
1458 #ifdef illumos
1459 VFS_RELE(zfsvfs->z_vfs);
1460 #endif
1461 }
1462
1463 void
zfs_tstamp_update_setup(znode_t * zp,uint_t flag,uint64_t mtime[2],uint64_t ctime[2],boolean_t have_tx)1464 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1465 uint64_t ctime[2], boolean_t have_tx)
1466 {
1467 timestruc_t now;
1468
1469 vfs_timestamp(&now);
1470
1471 if (have_tx) { /* will sa_bulk_update happen really soon? */
1472 zp->z_atime_dirty = 0;
1473 zp->z_seq++;
1474 } else {
1475 zp->z_atime_dirty = 1;
1476 }
1477
1478 if (flag & AT_ATIME) {
1479 ZFS_TIME_ENCODE(&now, zp->z_atime);
1480 }
1481
1482 if (flag & AT_MTIME) {
1483 ZFS_TIME_ENCODE(&now, mtime);
1484 if (zp->z_zfsvfs->z_use_fuids) {
1485 zp->z_pflags |= (ZFS_ARCHIVE |
1486 ZFS_AV_MODIFIED);
1487 }
1488 }
1489
1490 if (flag & AT_CTIME) {
1491 ZFS_TIME_ENCODE(&now, ctime);
1492 if (zp->z_zfsvfs->z_use_fuids)
1493 zp->z_pflags |= ZFS_ARCHIVE;
1494 }
1495 }
1496
1497 /*
1498 * Grow the block size for a file.
1499 *
1500 * IN: zp - znode of file to free data in.
1501 * size - requested block size
1502 * tx - open transaction.
1503 *
1504 * NOTE: this function assumes that the znode is write locked.
1505 */
1506 void
zfs_grow_blocksize(znode_t * zp,uint64_t size,dmu_tx_t * tx)1507 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1508 {
1509 int error;
1510 u_longlong_t dummy;
1511
1512 if (size <= zp->z_blksz)
1513 return;
1514 /*
1515 * If the file size is already greater than the current blocksize,
1516 * we will not grow. If there is more than one block in a file,
1517 * the blocksize cannot change.
1518 */
1519 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1520 return;
1521
1522 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
1523 size, 0, tx);
1524
1525 if (error == ENOTSUP)
1526 return;
1527 ASSERT0(error);
1528
1529 /* What blocksize did we actually get? */
1530 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1531 }
1532
1533 #ifdef illumos
1534 /*
1535 * This is a dummy interface used when pvn_vplist_dirty() should *not*
1536 * be calling back into the fs for a putpage(). E.g.: when truncating
1537 * a file, the pages being "thrown away* don't need to be written out.
1538 */
1539 /* ARGSUSED */
1540 static int
zfs_no_putpage(vnode_t * vp,page_t * pp,u_offset_t * offp,size_t * lenp,int flags,cred_t * cr)1541 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
1542 int flags, cred_t *cr)
1543 {
1544 ASSERT(0);
1545 return (0);
1546 }
1547 #endif
1548
1549 /*
1550 * Increase the file length
1551 *
1552 * IN: zp - znode of file to free data in.
1553 * end - new end-of-file
1554 *
1555 * RETURN: 0 on success, error code on failure
1556 */
1557 static int
zfs_extend(znode_t * zp,uint64_t end)1558 zfs_extend(znode_t *zp, uint64_t end)
1559 {
1560 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1561 dmu_tx_t *tx;
1562 rl_t *rl;
1563 uint64_t newblksz;
1564 int error;
1565
1566 /*
1567 * We will change zp_size, lock the whole file.
1568 */
1569 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1570
1571 /*
1572 * Nothing to do if file already at desired length.
1573 */
1574 if (end <= zp->z_size) {
1575 zfs_range_unlock(rl);
1576 return (0);
1577 }
1578 tx = dmu_tx_create(zfsvfs->z_os);
1579 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1580 zfs_sa_upgrade_txholds(tx, zp);
1581 if (end > zp->z_blksz &&
1582 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1583 /*
1584 * We are growing the file past the current block size.
1585 */
1586 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
1587 /*
1588 * File's blocksize is already larger than the
1589 * "recordsize" property. Only let it grow to
1590 * the next power of 2.
1591 */
1592 ASSERT(!ISP2(zp->z_blksz));
1593 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1594 } else {
1595 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
1596 }
1597 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1598 } else {
1599 newblksz = 0;
1600 }
1601
1602 error = dmu_tx_assign(tx, TXG_WAIT);
1603 if (error) {
1604 dmu_tx_abort(tx);
1605 zfs_range_unlock(rl);
1606 return (error);
1607 }
1608
1609 if (newblksz)
1610 zfs_grow_blocksize(zp, newblksz, tx);
1611
1612 zp->z_size = end;
1613
1614 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
1615 &zp->z_size, sizeof (zp->z_size), tx));
1616
1617 vnode_pager_setsize(ZTOV(zp), end);
1618
1619 zfs_range_unlock(rl);
1620
1621 dmu_tx_commit(tx);
1622
1623 return (0);
1624 }
1625
1626 /*
1627 * Free space in a file.
1628 *
1629 * IN: zp - znode of file to free data in.
1630 * off - start of section to free.
1631 * len - length of section to free.
1632 *
1633 * RETURN: 0 on success, error code on failure
1634 */
1635 static int
zfs_free_range(znode_t * zp,uint64_t off,uint64_t len)1636 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1637 {
1638 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1639 rl_t *rl;
1640 int error;
1641
1642 /*
1643 * Lock the range being freed.
1644 */
1645 rl = zfs_range_lock(zp, off, len, RL_WRITER);
1646
1647 /*
1648 * Nothing to do if file already at desired length.
1649 */
1650 if (off >= zp->z_size) {
1651 zfs_range_unlock(rl);
1652 return (0);
1653 }
1654
1655 if (off + len > zp->z_size)
1656 len = zp->z_size - off;
1657
1658 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1659
1660 if (error == 0) {
1661 /*
1662 * In FreeBSD we cannot free block in the middle of a file,
1663 * but only at the end of a file, so this code path should
1664 * never happen.
1665 */
1666 vnode_pager_setsize(ZTOV(zp), off);
1667 }
1668
1669 zfs_range_unlock(rl);
1670
1671 return (error);
1672 }
1673
1674 /*
1675 * Truncate a file
1676 *
1677 * IN: zp - znode of file to free data in.
1678 * end - new end-of-file.
1679 *
1680 * RETURN: 0 on success, error code on failure
1681 */
1682 static int
zfs_trunc(znode_t * zp,uint64_t end)1683 zfs_trunc(znode_t *zp, uint64_t end)
1684 {
1685 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1686 vnode_t *vp = ZTOV(zp);
1687 dmu_tx_t *tx;
1688 rl_t *rl;
1689 int error;
1690 sa_bulk_attr_t bulk[2];
1691 int count = 0;
1692
1693 /*
1694 * We will change zp_size, lock the whole file.
1695 */
1696 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1697
1698 /*
1699 * Nothing to do if file already at desired length.
1700 */
1701 if (end >= zp->z_size) {
1702 zfs_range_unlock(rl);
1703 return (0);
1704 }
1705
1706 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
1707 DMU_OBJECT_END);
1708 if (error) {
1709 zfs_range_unlock(rl);
1710 return (error);
1711 }
1712 tx = dmu_tx_create(zfsvfs->z_os);
1713 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1714 zfs_sa_upgrade_txholds(tx, zp);
1715 dmu_tx_mark_netfree(tx);
1716 error = dmu_tx_assign(tx, TXG_WAIT);
1717 if (error) {
1718 dmu_tx_abort(tx);
1719 zfs_range_unlock(rl);
1720 return (error);
1721 }
1722
1723 zp->z_size = end;
1724 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1725 NULL, &zp->z_size, sizeof (zp->z_size));
1726
1727 if (end == 0) {
1728 zp->z_pflags &= ~ZFS_SPARSE;
1729 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1730 NULL, &zp->z_pflags, 8);
1731 }
1732 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1733
1734 dmu_tx_commit(tx);
1735
1736 /*
1737 * Clear any mapped pages in the truncated region. This has to
1738 * happen outside of the transaction to avoid the possibility of
1739 * a deadlock with someone trying to push a page that we are
1740 * about to invalidate.
1741 */
1742 vnode_pager_setsize(vp, end);
1743
1744 zfs_range_unlock(rl);
1745
1746 return (0);
1747 }
1748
1749 /*
1750 * Free space in a file
1751 *
1752 * IN: zp - znode of file to free data in.
1753 * off - start of range
1754 * len - end of range (0 => EOF)
1755 * flag - current file open mode flags.
1756 * log - TRUE if this action should be logged
1757 *
1758 * RETURN: 0 on success, error code on failure
1759 */
1760 int
zfs_freesp(znode_t * zp,uint64_t off,uint64_t len,int flag,boolean_t log)1761 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1762 {
1763 vnode_t *vp = ZTOV(zp);
1764 dmu_tx_t *tx;
1765 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1766 zilog_t *zilog = zfsvfs->z_log;
1767 uint64_t mode;
1768 uint64_t mtime[2], ctime[2];
1769 sa_bulk_attr_t bulk[3];
1770 int count = 0;
1771 int error;
1772
1773 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1774 sizeof (mode))) != 0)
1775 return (error);
1776
1777 if (off > zp->z_size) {
1778 error = zfs_extend(zp, off+len);
1779 if (error == 0 && log)
1780 goto log;
1781 else
1782 return (error);
1783 }
1784
1785 /*
1786 * Check for any locks in the region to be freed.
1787 */
1788
1789 if (MANDLOCK(vp, (mode_t)mode)) {
1790 uint64_t length = (len ? len : zp->z_size - off);
1791 if (error = chklock(vp, FWRITE, off, length, flag, NULL))
1792 return (error);
1793 }
1794
1795 if (len == 0) {
1796 error = zfs_trunc(zp, off);
1797 } else {
1798 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1799 off + len > zp->z_size)
1800 error = zfs_extend(zp, off+len);
1801 }
1802 if (error || !log)
1803 return (error);
1804 log:
1805 tx = dmu_tx_create(zfsvfs->z_os);
1806 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1807 zfs_sa_upgrade_txholds(tx, zp);
1808 error = dmu_tx_assign(tx, TXG_WAIT);
1809 if (error) {
1810 dmu_tx_abort(tx);
1811 return (error);
1812 }
1813
1814 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1815 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1816 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1817 NULL, &zp->z_pflags, 8);
1818 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
1819 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1820 ASSERT(error == 0);
1821
1822 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1823
1824 dmu_tx_commit(tx);
1825 return (0);
1826 }
1827
1828 void
zfs_create_fs(objset_t * os,cred_t * cr,nvlist_t * zplprops,dmu_tx_t * tx)1829 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1830 {
1831 uint64_t moid, obj, sa_obj, version;
1832 uint64_t sense = ZFS_CASE_SENSITIVE;
1833 uint64_t norm = 0;
1834 nvpair_t *elem;
1835 int error;
1836 int i;
1837 znode_t *rootzp = NULL;
1838 zfsvfs_t *zfsvfs;
1839 vattr_t vattr;
1840 znode_t *zp;
1841 zfs_acl_ids_t acl_ids;
1842
1843 /*
1844 * First attempt to create master node.
1845 */
1846 /*
1847 * In an empty objset, there are no blocks to read and thus
1848 * there can be no i/o errors (which we assert below).
1849 */
1850 moid = MASTER_NODE_OBJ;
1851 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1852 DMU_OT_NONE, 0, tx);
1853 ASSERT(error == 0);
1854
1855 /*
1856 * Set starting attributes.
1857 */
1858 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1859 elem = NULL;
1860 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1861 /* For the moment we expect all zpl props to be uint64_ts */
1862 uint64_t val;
1863 char *name;
1864
1865 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1866 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1867 name = nvpair_name(elem);
1868 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1869 if (val < version)
1870 version = val;
1871 } else {
1872 error = zap_update(os, moid, name, 8, 1, &val, tx);
1873 }
1874 ASSERT(error == 0);
1875 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1876 norm = val;
1877 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1878 sense = val;
1879 }
1880 ASSERT(version != 0);
1881 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1882
1883 /*
1884 * Create zap object used for SA attribute registration
1885 */
1886
1887 if (version >= ZPL_VERSION_SA) {
1888 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1889 DMU_OT_NONE, 0, tx);
1890 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1891 ASSERT(error == 0);
1892 } else {
1893 sa_obj = 0;
1894 }
1895 /*
1896 * Create a delete queue.
1897 */
1898 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1899
1900 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1901 ASSERT(error == 0);
1902
1903 /*
1904 * Create root znode. Create minimal znode/vnode/zfsvfs
1905 * to allow zfs_mknode to work.
1906 */
1907 VATTR_NULL(&vattr);
1908 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
1909 vattr.va_type = VDIR;
1910 vattr.va_mode = S_IFDIR|0755;
1911 vattr.va_uid = crgetuid(cr);
1912 vattr.va_gid = crgetgid(cr);
1913
1914 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1915
1916 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1917 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
1918 rootzp->z_moved = 0;
1919 rootzp->z_unlinked = 0;
1920 rootzp->z_atime_dirty = 0;
1921 rootzp->z_is_sa = USE_SA(version, os);
1922
1923 zfsvfs->z_os = os;
1924 zfsvfs->z_parent = zfsvfs;
1925 zfsvfs->z_version = version;
1926 zfsvfs->z_use_fuids = USE_FUIDS(version, os);
1927 zfsvfs->z_use_sa = USE_SA(version, os);
1928 zfsvfs->z_norm = norm;
1929
1930 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1931 &zfsvfs->z_attr_table);
1932
1933 ASSERT(error == 0);
1934
1935 /*
1936 * Fold case on file systems that are always or sometimes case
1937 * insensitive.
1938 */
1939 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1940 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
1941
1942 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1943 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1944 offsetof(znode_t, z_link_node));
1945
1946 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1947 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1948
1949 rootzp->z_zfsvfs = zfsvfs;
1950 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1951 cr, NULL, &acl_ids));
1952 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1953 ASSERT3P(zp, ==, rootzp);
1954 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1955 ASSERT(error == 0);
1956 zfs_acl_ids_free(&acl_ids);
1957 POINTER_INVALIDATE(&rootzp->z_zfsvfs);
1958
1959 sa_handle_destroy(rootzp->z_sa_hdl);
1960 kmem_cache_free(znode_cache, rootzp);
1961
1962 /*
1963 * Create shares directory
1964 */
1965
1966 error = zfs_create_share_dir(zfsvfs, tx);
1967
1968 ASSERT(error == 0);
1969
1970 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1971 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1972 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1973 }
1974 #endif /* _KERNEL */
1975
1976 static int
zfs_sa_setup(objset_t * osp,sa_attr_type_t ** sa_table)1977 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1978 {
1979 uint64_t sa_obj = 0;
1980 int error;
1981
1982 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1983 if (error != 0 && error != ENOENT)
1984 return (error);
1985
1986 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1987 return (error);
1988 }
1989
1990 static int
zfs_grab_sa_handle(objset_t * osp,uint64_t obj,sa_handle_t ** hdlp,dmu_buf_t ** db,void * tag)1991 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
1992 dmu_buf_t **db, void *tag)
1993 {
1994 dmu_object_info_t doi;
1995 int error;
1996
1997 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
1998 return (error);
1999
2000 dmu_object_info_from_db(*db, &doi);
2001 if ((doi.doi_bonus_type != DMU_OT_SA &&
2002 doi.doi_bonus_type != DMU_OT_ZNODE) ||
2003 doi.doi_bonus_type == DMU_OT_ZNODE &&
2004 doi.doi_bonus_size < sizeof (znode_phys_t)) {
2005 sa_buf_rele(*db, tag);
2006 return (SET_ERROR(ENOTSUP));
2007 }
2008
2009 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
2010 if (error != 0) {
2011 sa_buf_rele(*db, tag);
2012 return (error);
2013 }
2014
2015 return (0);
2016 }
2017
2018 void
zfs_release_sa_handle(sa_handle_t * hdl,dmu_buf_t * db,void * tag)2019 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
2020 {
2021 sa_handle_destroy(hdl);
2022 sa_buf_rele(db, tag);
2023 }
2024
2025 /*
2026 * Given an object number, return its parent object number and whether
2027 * or not the object is an extended attribute directory.
2028 */
2029 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)2030 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
2031 uint64_t *pobjp, int *is_xattrdir)
2032 {
2033 uint64_t parent;
2034 uint64_t pflags;
2035 uint64_t mode;
2036 uint64_t parent_mode;
2037 sa_bulk_attr_t bulk[3];
2038 sa_handle_t *sa_hdl;
2039 dmu_buf_t *sa_db;
2040 int count = 0;
2041 int error;
2042
2043 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
2044 &parent, sizeof (parent));
2045 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
2046 &pflags, sizeof (pflags));
2047 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2048 &mode, sizeof (mode));
2049
2050 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
2051 return (error);
2052
2053 /*
2054 * When a link is removed its parent pointer is not changed and will
2055 * be invalid. There are two cases where a link is removed but the
2056 * file stays around, when it goes to the delete queue and when there
2057 * are additional links.
2058 */
2059 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
2060 if (error != 0)
2061 return (error);
2062
2063 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
2064 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2065 if (error != 0)
2066 return (error);
2067
2068 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
2069
2070 /*
2071 * Extended attributes can be applied to files, directories, etc.
2072 * Otherwise the parent must be a directory.
2073 */
2074 if (!*is_xattrdir && !S_ISDIR(parent_mode))
2075 return (SET_ERROR(EINVAL));
2076
2077 *pobjp = parent;
2078
2079 return (0);
2080 }
2081
2082 /*
2083 * Given an object number, return some zpl level statistics
2084 */
2085 static int
zfs_obj_to_stats_impl(sa_handle_t * hdl,sa_attr_type_t * sa_table,zfs_stat_t * sb)2086 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
2087 zfs_stat_t *sb)
2088 {
2089 sa_bulk_attr_t bulk[4];
2090 int count = 0;
2091
2092 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2093 &sb->zs_mode, sizeof (sb->zs_mode));
2094 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
2095 &sb->zs_gen, sizeof (sb->zs_gen));
2096 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
2097 &sb->zs_links, sizeof (sb->zs_links));
2098 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
2099 &sb->zs_ctime, sizeof (sb->zs_ctime));
2100
2101 return (sa_bulk_lookup(hdl, bulk, count));
2102 }
2103
2104 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)2105 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
2106 sa_attr_type_t *sa_table, char *buf, int len)
2107 {
2108 sa_handle_t *sa_hdl;
2109 sa_handle_t *prevhdl = NULL;
2110 dmu_buf_t *prevdb = NULL;
2111 dmu_buf_t *sa_db = NULL;
2112 char *path = buf + len - 1;
2113 int error;
2114
2115 *path = '\0';
2116 sa_hdl = hdl;
2117
2118 uint64_t deleteq_obj;
2119 VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ,
2120 ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));
2121 error = zap_lookup_int(osp, deleteq_obj, obj);
2122 if (error == 0) {
2123 return (ESTALE);
2124 } else if (error != ENOENT) {
2125 return (error);
2126 }
2127 error = 0;
2128
2129 for (;;) {
2130 uint64_t pobj;
2131 char component[MAXNAMELEN + 2];
2132 size_t complen;
2133 int is_xattrdir;
2134
2135 if (prevdb)
2136 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
2137
2138 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
2139 &is_xattrdir)) != 0)
2140 break;
2141
2142 if (pobj == obj) {
2143 if (path[0] != '/')
2144 *--path = '/';
2145 break;
2146 }
2147
2148 component[0] = '/';
2149 if (is_xattrdir) {
2150 (void) sprintf(component + 1, "<xattrdir>");
2151 } else {
2152 error = zap_value_search(osp, pobj, obj,
2153 ZFS_DIRENT_OBJ(-1ULL), component + 1);
2154 if (error != 0)
2155 break;
2156 }
2157
2158 complen = strlen(component);
2159 path -= complen;
2160 ASSERT(path >= buf);
2161 bcopy(component, path, complen);
2162 obj = pobj;
2163
2164 if (sa_hdl != hdl) {
2165 prevhdl = sa_hdl;
2166 prevdb = sa_db;
2167 }
2168 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
2169 if (error != 0) {
2170 sa_hdl = prevhdl;
2171 sa_db = prevdb;
2172 break;
2173 }
2174 }
2175
2176 if (sa_hdl != NULL && sa_hdl != hdl) {
2177 ASSERT(sa_db != NULL);
2178 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2179 }
2180
2181 if (error == 0)
2182 (void) memmove(buf, path, buf + len - path);
2183
2184 return (error);
2185 }
2186
2187 int
zfs_obj_to_path(objset_t * osp,uint64_t obj,char * buf,int len)2188 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
2189 {
2190 sa_attr_type_t *sa_table;
2191 sa_handle_t *hdl;
2192 dmu_buf_t *db;
2193 int error;
2194
2195 error = zfs_sa_setup(osp, &sa_table);
2196 if (error != 0)
2197 return (error);
2198
2199 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2200 if (error != 0)
2201 return (error);
2202
2203 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2204
2205 zfs_release_sa_handle(hdl, db, FTAG);
2206 return (error);
2207 }
2208
2209 int
zfs_obj_to_stats(objset_t * osp,uint64_t obj,zfs_stat_t * sb,char * buf,int len)2210 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
2211 char *buf, int len)
2212 {
2213 char *path = buf + len - 1;
2214 sa_attr_type_t *sa_table;
2215 sa_handle_t *hdl;
2216 dmu_buf_t *db;
2217 int error;
2218
2219 *path = '\0';
2220
2221 error = zfs_sa_setup(osp, &sa_table);
2222 if (error != 0)
2223 return (error);
2224
2225 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2226 if (error != 0)
2227 return (error);
2228
2229 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
2230 if (error != 0) {
2231 zfs_release_sa_handle(hdl, db, FTAG);
2232 return (error);
2233 }
2234
2235 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2236
2237 zfs_release_sa_handle(hdl, db, FTAG);
2238 return (error);
2239 }
2240
2241 #ifdef _KERNEL
2242 int
zfs_znode_parent_and_name(znode_t * zp,znode_t ** dzpp,char * buf)2243 zfs_znode_parent_and_name(znode_t *zp, znode_t **dzpp, char *buf)
2244 {
2245 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2246 uint64_t parent;
2247 int is_xattrdir;
2248 int err;
2249
2250 /* Extended attributes should not be visible as regular files. */
2251 if ((zp->z_pflags & ZFS_XATTR) != 0)
2252 return (SET_ERROR(EINVAL));
2253
2254 err = zfs_obj_to_pobj(zfsvfs->z_os, zp->z_sa_hdl, zfsvfs->z_attr_table,
2255 &parent, &is_xattrdir);
2256 if (err != 0)
2257 return (err);
2258 ASSERT0(is_xattrdir);
2259
2260 /* No name as this is a root object. */
2261 if (parent == zp->z_id)
2262 return (SET_ERROR(EINVAL));
2263
2264 err = zap_value_search(zfsvfs->z_os, parent, zp->z_id,
2265 ZFS_DIRENT_OBJ(-1ULL), buf);
2266 if (err != 0)
2267 return (err);
2268 err = zfs_zget(zfsvfs, parent, dzpp);
2269 return (err);
2270 }
2271 #endif /* _KERNEL */
2272