1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 */
25
26 /* Portions Copyright 2007 Jeremy Teo */
27 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
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/u8_textprep.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/vfs.h>
40 #include <sys/vnode.h>
41 #include <sys/file.h>
42 #include <sys/kmem.h>
43 #include <sys/errno.h>
44 #include <sys/unistd.h>
45 #include <sys/atomic.h>
46 #include <sys/zfs_dir.h>
47 #include <sys/zfs_acl.h>
48 #include <sys/zfs_ioctl.h>
49 #include <sys/zfs_rlock.h>
50 #include <sys/zfs_fuid.h>
51 #include <sys/dnode.h>
52 #include <sys/fs/zfs.h>
53 #include <sys/kidmap.h>
54 #endif /* _KERNEL */
55
56 #include <sys/dmu.h>
57 #include <sys/dmu_objset.h>
58 #include <sys/refcount.h>
59 #include <sys/stat.h>
60 #include <sys/zap.h>
61 #include <sys/zfs_znode.h>
62 #include <sys/sa.h>
63 #include <sys/zfs_sa.h>
64 #include <sys/zfs_stat.h>
65 #include <sys/refcount.h>
66
67 #include "zfs_prop.h"
68 #include "zfs_comutil.h"
69
70 /* Used by fstat(1). */
71 SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
72 SYSCTL_NULL_INT_PTR, sizeof(znode_t), "sizeof(znode_t)");
73
74 /*
75 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only
76 * turned on when DEBUG is also defined.
77 */
78 #ifdef DEBUG
79 #define ZNODE_STATS
80 #endif /* DEBUG */
81
82 #ifdef ZNODE_STATS
83 #define ZNODE_STAT_ADD(stat) ((stat)++)
84 #else
85 #define ZNODE_STAT_ADD(stat) /* nothing */
86 #endif /* ZNODE_STATS */
87
88 /*
89 * Functions needed for userland (ie: libzpool) are not put under
90 * #ifdef_KERNEL; the rest of the functions have dependencies
91 * (such as VFS logic) that will not compile easily in userland.
92 */
93 #ifdef _KERNEL
94 /*
95 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to
96 * be freed before it can be safely accessed.
97 */
98 krwlock_t zfsvfs_lock;
99
100 static kmem_cache_t *znode_cache = NULL;
101
102 /*ARGSUSED*/
103 static void
znode_evict_error(dmu_buf_t * dbuf,void * user_ptr)104 znode_evict_error(dmu_buf_t *dbuf, void *user_ptr)
105 {
106 /*
107 * We should never drop all dbuf refs without first clearing
108 * the eviction callback.
109 */
110 panic("evicting znode %p\n", user_ptr);
111 }
112
113 extern struct vop_vector zfs_vnodeops;
114 extern struct vop_vector zfs_fifoops;
115 extern struct vop_vector zfs_shareops;
116
117 static int
zfs_znode_cache_constructor(void * buf,void * arg,int kmflags)118 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
119 {
120 znode_t *zp = buf;
121
122 POINTER_INVALIDATE(&zp->z_zfsvfs);
123
124 list_link_init(&zp->z_link_node);
125
126 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
127 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
128 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
129 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
130
131 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
132 avl_create(&zp->z_range_avl, zfs_range_compare,
133 sizeof (rl_t), offsetof(rl_t, r_node));
134
135 zp->z_dirlocks = NULL;
136 zp->z_acl_cached = NULL;
137 zp->z_vnode = NULL;
138 zp->z_moved = 0;
139 return (0);
140 }
141
142 /*ARGSUSED*/
143 static void
zfs_znode_cache_destructor(void * buf,void * arg)144 zfs_znode_cache_destructor(void *buf, void *arg)
145 {
146 znode_t *zp = buf;
147
148 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
149 ASSERT(ZTOV(zp) == NULL);
150 vn_free(ZTOV(zp));
151 ASSERT(!list_link_active(&zp->z_link_node));
152 mutex_destroy(&zp->z_lock);
153 rw_destroy(&zp->z_parent_lock);
154 rw_destroy(&zp->z_name_lock);
155 mutex_destroy(&zp->z_acl_lock);
156 avl_destroy(&zp->z_range_avl);
157 mutex_destroy(&zp->z_range_lock);
158
159 ASSERT(zp->z_dirlocks == NULL);
160 ASSERT(zp->z_acl_cached == NULL);
161 }
162
163 #ifdef ZNODE_STATS
164 static struct {
165 uint64_t zms_zfsvfs_invalid;
166 uint64_t zms_zfsvfs_recheck1;
167 uint64_t zms_zfsvfs_unmounted;
168 uint64_t zms_zfsvfs_recheck2;
169 uint64_t zms_obj_held;
170 uint64_t zms_vnode_locked;
171 uint64_t zms_not_only_dnlc;
172 } znode_move_stats;
173 #endif /* ZNODE_STATS */
174
175 #ifdef sun
176 static void
zfs_znode_move_impl(znode_t * ozp,znode_t * nzp)177 zfs_znode_move_impl(znode_t *ozp, znode_t *nzp)
178 {
179 vnode_t *vp;
180
181 /* Copy fields. */
182 nzp->z_zfsvfs = ozp->z_zfsvfs;
183
184 /* Swap vnodes. */
185 vp = nzp->z_vnode;
186 nzp->z_vnode = ozp->z_vnode;
187 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */
188 ZTOV(ozp)->v_data = ozp;
189 ZTOV(nzp)->v_data = nzp;
190
191 nzp->z_id = ozp->z_id;
192 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */
193 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0);
194 nzp->z_unlinked = ozp->z_unlinked;
195 nzp->z_atime_dirty = ozp->z_atime_dirty;
196 nzp->z_zn_prefetch = ozp->z_zn_prefetch;
197 nzp->z_blksz = ozp->z_blksz;
198 nzp->z_seq = ozp->z_seq;
199 nzp->z_mapcnt = ozp->z_mapcnt;
200 nzp->z_gen = ozp->z_gen;
201 nzp->z_sync_cnt = ozp->z_sync_cnt;
202 nzp->z_is_sa = ozp->z_is_sa;
203 nzp->z_sa_hdl = ozp->z_sa_hdl;
204 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2);
205 nzp->z_links = ozp->z_links;
206 nzp->z_size = ozp->z_size;
207 nzp->z_pflags = ozp->z_pflags;
208 nzp->z_uid = ozp->z_uid;
209 nzp->z_gid = ozp->z_gid;
210 nzp->z_mode = ozp->z_mode;
211
212 /*
213 * Since this is just an idle znode and kmem is already dealing with
214 * memory pressure, release any cached ACL.
215 */
216 if (ozp->z_acl_cached) {
217 zfs_acl_free(ozp->z_acl_cached);
218 ozp->z_acl_cached = NULL;
219 }
220
221 sa_set_userp(nzp->z_sa_hdl, nzp);
222
223 /*
224 * Invalidate the original znode by clearing fields that provide a
225 * pointer back to the znode. Set the low bit of the vfs pointer to
226 * ensure that zfs_znode_move() recognizes the znode as invalid in any
227 * subsequent callback.
228 */
229 ozp->z_sa_hdl = NULL;
230 POINTER_INVALIDATE(&ozp->z_zfsvfs);
231
232 /*
233 * Mark the znode.
234 */
235 nzp->z_moved = 1;
236 ozp->z_moved = (uint8_t)-1;
237 }
238
239 /*ARGSUSED*/
240 static kmem_cbrc_t
zfs_znode_move(void * buf,void * newbuf,size_t size,void * arg)241 zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg)
242 {
243 znode_t *ozp = buf, *nzp = newbuf;
244 zfsvfs_t *zfsvfs;
245 vnode_t *vp;
246
247 /*
248 * The znode is on the file system's list of known znodes if the vfs
249 * pointer is valid. We set the low bit of the vfs pointer when freeing
250 * the znode to invalidate it, and the memory patterns written by kmem
251 * (baddcafe and deadbeef) set at least one of the two low bits. A newly
252 * created znode sets the vfs pointer last of all to indicate that the
253 * znode is known and in a valid state to be moved by this function.
254 */
255 zfsvfs = ozp->z_zfsvfs;
256 if (!POINTER_IS_VALID(zfsvfs)) {
257 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid);
258 return (KMEM_CBRC_DONT_KNOW);
259 }
260
261 /*
262 * Close a small window in which it's possible that the filesystem could
263 * be unmounted and freed, and zfsvfs, though valid in the previous
264 * statement, could point to unrelated memory by the time we try to
265 * prevent the filesystem from being unmounted.
266 */
267 rw_enter(&zfsvfs_lock, RW_WRITER);
268 if (zfsvfs != ozp->z_zfsvfs) {
269 rw_exit(&zfsvfs_lock);
270 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1);
271 return (KMEM_CBRC_DONT_KNOW);
272 }
273
274 /*
275 * If the znode is still valid, then so is the file system. We know that
276 * no valid file system can be freed while we hold zfsvfs_lock, so we
277 * can safely ensure that the filesystem is not and will not be
278 * unmounted. The next statement is equivalent to ZFS_ENTER().
279 */
280 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG);
281 if (zfsvfs->z_unmounted) {
282 ZFS_EXIT(zfsvfs);
283 rw_exit(&zfsvfs_lock);
284 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted);
285 return (KMEM_CBRC_DONT_KNOW);
286 }
287 rw_exit(&zfsvfs_lock);
288
289 mutex_enter(&zfsvfs->z_znodes_lock);
290 /*
291 * Recheck the vfs pointer in case the znode was removed just before
292 * acquiring the lock.
293 */
294 if (zfsvfs != ozp->z_zfsvfs) {
295 mutex_exit(&zfsvfs->z_znodes_lock);
296 ZFS_EXIT(zfsvfs);
297 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2);
298 return (KMEM_CBRC_DONT_KNOW);
299 }
300
301 /*
302 * At this point we know that as long as we hold z_znodes_lock, the
303 * znode cannot be freed and fields within the znode can be safely
304 * accessed. Now, prevent a race with zfs_zget().
305 */
306 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) {
307 mutex_exit(&zfsvfs->z_znodes_lock);
308 ZFS_EXIT(zfsvfs);
309 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held);
310 return (KMEM_CBRC_LATER);
311 }
312
313 vp = ZTOV(ozp);
314 if (mutex_tryenter(&vp->v_lock) == 0) {
315 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
316 mutex_exit(&zfsvfs->z_znodes_lock);
317 ZFS_EXIT(zfsvfs);
318 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked);
319 return (KMEM_CBRC_LATER);
320 }
321
322 /* Only move znodes that are referenced _only_ by the DNLC. */
323 if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
324 mutex_exit(&vp->v_lock);
325 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
326 mutex_exit(&zfsvfs->z_znodes_lock);
327 ZFS_EXIT(zfsvfs);
328 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc);
329 return (KMEM_CBRC_LATER);
330 }
331
332 /*
333 * The znode is known and in a valid state to move. We're holding the
334 * locks needed to execute the critical section.
335 */
336 zfs_znode_move_impl(ozp, nzp);
337 mutex_exit(&vp->v_lock);
338 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
339
340 list_link_replace(&ozp->z_link_node, &nzp->z_link_node);
341 mutex_exit(&zfsvfs->z_znodes_lock);
342 ZFS_EXIT(zfsvfs);
343
344 return (KMEM_CBRC_YES);
345 }
346 #endif /* sun */
347
348 void
zfs_znode_init(void)349 zfs_znode_init(void)
350 {
351 /*
352 * Initialize zcache
353 */
354 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
355 ASSERT(znode_cache == NULL);
356 znode_cache = kmem_cache_create("zfs_znode_cache",
357 sizeof (znode_t), 0, zfs_znode_cache_constructor,
358 zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
359 kmem_cache_set_move(znode_cache, zfs_znode_move);
360 }
361
362 void
zfs_znode_fini(void)363 zfs_znode_fini(void)
364 {
365 #ifdef sun
366 /*
367 * Cleanup vfs & vnode ops
368 */
369 zfs_remove_op_tables();
370 #endif /* sun */
371
372 /*
373 * Cleanup zcache
374 */
375 if (znode_cache)
376 kmem_cache_destroy(znode_cache);
377 znode_cache = NULL;
378 rw_destroy(&zfsvfs_lock);
379 }
380
381 #ifdef sun
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 #endif /* sun */
474
475 int
zfs_create_share_dir(zfsvfs_t * zfsvfs,dmu_tx_t * tx)476 zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
477 {
478 zfs_acl_ids_t acl_ids;
479 vattr_t vattr;
480 znode_t *sharezp;
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 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
499 kcred, NULL, &acl_ids));
500 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
501 ASSERT3P(zp, ==, sharezp);
502 POINTER_INVALIDATE(&sharezp->z_zfsvfs);
503 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
504 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
505 zfsvfs->z_shares_dir = sharezp->z_id;
506
507 zfs_acl_ids_free(&acl_ids);
508 sa_handle_destroy(sharezp->z_sa_hdl);
509 kmem_cache_free(znode_cache, sharezp);
510
511 return (error);
512 }
513
514 /*
515 * define a couple of values we need available
516 * for both 64 and 32 bit environments.
517 */
518 #ifndef NBITSMINOR64
519 #define NBITSMINOR64 32
520 #endif
521 #ifndef MAXMAJ64
522 #define MAXMAJ64 0xffffffffUL
523 #endif
524 #ifndef MAXMIN64
525 #define MAXMIN64 0xffffffffUL
526 #endif
527
528 /*
529 * Create special expldev for ZFS private use.
530 * Can't use standard expldev since it doesn't do
531 * what we want. The standard expldev() takes a
532 * dev32_t in LP64 and expands it to a long dev_t.
533 * We need an interface that takes a dev32_t in ILP32
534 * and expands it to a long dev_t.
535 */
536 static uint64_t
zfs_expldev(dev_t dev)537 zfs_expldev(dev_t dev)
538 {
539 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev));
540 }
541 /*
542 * Special cmpldev for ZFS private use.
543 * Can't use standard cmpldev since it takes
544 * a long dev_t and compresses it to dev32_t in
545 * LP64. We need to do a compaction of a long dev_t
546 * to a dev32_t in ILP32.
547 */
548 dev_t
zfs_cmpldev(uint64_t dev)549 zfs_cmpldev(uint64_t dev)
550 {
551 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64)));
552 }
553
554 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)555 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
556 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
557 {
558 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs));
559 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));
560
561 mutex_enter(&zp->z_lock);
562
563 ASSERT(zp->z_sa_hdl == NULL);
564 ASSERT(zp->z_acl_cached == NULL);
565 if (sa_hdl == NULL) {
566 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
567 SA_HDL_SHARED, &zp->z_sa_hdl));
568 } else {
569 zp->z_sa_hdl = sa_hdl;
570 sa_set_userp(sa_hdl, zp);
571 }
572
573 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
574
575 /*
576 * Slap on VROOT if we are the root znode
577 */
578 if (zp->z_id == zfsvfs->z_root)
579 ZTOV(zp)->v_flag |= VROOT;
580
581 mutex_exit(&zp->z_lock);
582 vn_exists(ZTOV(zp));
583 }
584
585 void
zfs_znode_dmu_fini(znode_t * zp)586 zfs_znode_dmu_fini(znode_t *zp)
587 {
588 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) ||
589 zp->z_unlinked ||
590 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock));
591
592 sa_handle_destroy(zp->z_sa_hdl);
593 zp->z_sa_hdl = NULL;
594 }
595
596 static void
zfs_vnode_forget(vnode_t * vp)597 zfs_vnode_forget(vnode_t *vp)
598 {
599
600 /* copied from insmntque_stddtr */
601 vp->v_data = NULL;
602 vp->v_op = &dead_vnodeops;
603 vgone(vp);
604 vput(vp);
605 }
606
607 /*
608 * Construct a new znode/vnode and intialize.
609 *
610 * This does not do a call to dmu_set_user() that is
611 * up to the caller to do, in case you don't want to
612 * return the znode
613 */
614 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)615 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
616 dmu_object_type_t obj_type, sa_handle_t *hdl)
617 {
618 znode_t *zp;
619 vnode_t *vp;
620 uint64_t mode;
621 uint64_t parent;
622 sa_bulk_attr_t bulk[9];
623 int count = 0;
624 int error;
625
626 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
627
628 KASSERT(curthread->td_vp_reserv > 0,
629 ("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
630 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
631 if (error != 0) {
632 kmem_cache_free(znode_cache, zp);
633 return (NULL);
634 }
635 zp->z_vnode = vp;
636 vp->v_data = zp;
637
638 ASSERT(zp->z_dirlocks == NULL);
639 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
640 zp->z_moved = 0;
641
642 /*
643 * Defer setting z_zfsvfs until the znode is ready to be a candidate for
644 * the zfs_znode_move() callback.
645 */
646 zp->z_sa_hdl = NULL;
647 zp->z_unlinked = 0;
648 zp->z_atime_dirty = 0;
649 zp->z_mapcnt = 0;
650 zp->z_id = db->db_object;
651 zp->z_blksz = blksz;
652 zp->z_seq = 0x7A4653;
653 zp->z_sync_cnt = 0;
654
655 vp = ZTOV(zp);
656
657 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
658
659 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
660 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
662 &zp->z_size, 8);
663 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
664 &zp->z_links, 8);
665 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
666 &zp->z_pflags, 8);
667 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
668 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
669 &zp->z_atime, 16);
670 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
671 &zp->z_uid, 8);
672 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
673 &zp->z_gid, 8);
674
675 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
676 if (hdl == NULL)
677 sa_handle_destroy(zp->z_sa_hdl);
678 zfs_vnode_forget(vp);
679 zp->z_vnode = NULL;
680 kmem_cache_free(znode_cache, zp);
681 return (NULL);
682 }
683
684 zp->z_mode = mode;
685
686 vp->v_type = IFTOVT((mode_t)mode);
687
688 switch (vp->v_type) {
689 case VDIR:
690 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
691 break;
692 #ifdef sun
693 case VBLK:
694 case VCHR:
695 {
696 uint64_t rdev;
697 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
698 &rdev, sizeof (rdev)) == 0);
699
700 vp->v_rdev = zfs_cmpldev(rdev);
701 }
702 break;
703 #endif /* sun */
704 case VFIFO:
705 #ifdef sun
706 case VSOCK:
707 case VDOOR:
708 #endif /* sun */
709 vp->v_op = &zfs_fifoops;
710 break;
711 case VREG:
712 if (parent == zfsvfs->z_shares_dir) {
713 ASSERT(zp->z_uid == 0 && zp->z_gid == 0);
714 vp->v_op = &zfs_shareops;
715 }
716 break;
717 #ifdef sun
718 case VLNK:
719 vn_setops(vp, zfs_symvnodeops);
720 break;
721 default:
722 vn_setops(vp, zfs_evnodeops);
723 break;
724 #endif /* sun */
725 }
726
727 mutex_enter(&zfsvfs->z_znodes_lock);
728 list_insert_tail(&zfsvfs->z_all_znodes, zp);
729 membar_producer();
730 /*
731 * Everything else must be valid before assigning z_zfsvfs makes the
732 * znode eligible for zfs_znode_move().
733 */
734 zp->z_zfsvfs = zfsvfs;
735 mutex_exit(&zfsvfs->z_znodes_lock);
736
737 /*
738 * Acquire vnode lock before making it available to the world.
739 */
740 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
741 VN_LOCK_AREC(vp);
742 if (vp->v_type != VFIFO)
743 VN_LOCK_ASHARE(vp);
744
745 VFS_HOLD(zfsvfs->z_vfs);
746 return (zp);
747 }
748
749 static uint64_t empty_xattr;
750 static uint64_t pad[4];
751 static zfs_acl_phys_t acl_phys;
752 /*
753 * Create a new DMU object to hold a zfs znode.
754 *
755 * IN: dzp - parent directory for new znode
756 * vap - file attributes for new znode
757 * tx - dmu transaction id for zap operations
758 * cr - credentials of caller
759 * flag - flags:
760 * IS_ROOT_NODE - new object will be root
761 * IS_XATTR - new object is an attribute
762 * bonuslen - length of bonus buffer
763 * setaclp - File/Dir initial ACL
764 * fuidp - Tracks fuid allocation.
765 *
766 * OUT: zpp - allocated znode
767 *
768 */
769 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)770 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
771 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
772 {
773 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
774 uint64_t mode, size, links, parent, pflags;
775 uint64_t dzp_pflags = 0;
776 uint64_t rdev = 0;
777 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
778 dmu_buf_t *db;
779 timestruc_t now;
780 uint64_t gen, obj;
781 int err;
782 int bonuslen;
783 sa_handle_t *sa_hdl;
784 dmu_object_type_t obj_type;
785 sa_bulk_attr_t sa_attrs[ZPL_END];
786 int cnt = 0;
787 zfs_acl_locator_cb_t locate = { 0 };
788
789 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
790
791 if (zfsvfs->z_replay) {
792 obj = vap->va_nodeid;
793 now = vap->va_ctime; /* see zfs_replay_create() */
794 gen = vap->va_nblocks; /* ditto */
795 } else {
796 obj = 0;
797 gethrestime(&now);
798 gen = dmu_tx_get_txg(tx);
799 }
800
801 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
802 bonuslen = (obj_type == DMU_OT_SA) ?
803 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
804
805 /*
806 * Create a new DMU object.
807 */
808 /*
809 * There's currently no mechanism for pre-reading the blocks that will
810 * be needed to allocate a new object, so we accept the small chance
811 * that there will be an i/o error and we will fail one of the
812 * assertions below.
813 */
814 if (vap->va_type == VDIR) {
815 if (zfsvfs->z_replay) {
816 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj,
817 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
818 obj_type, bonuslen, tx));
819 } else {
820 obj = zap_create_norm(zfsvfs->z_os,
821 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
822 obj_type, bonuslen, tx);
823 }
824 } else {
825 if (zfsvfs->z_replay) {
826 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj,
827 DMU_OT_PLAIN_FILE_CONTENTS, 0,
828 obj_type, bonuslen, tx));
829 } else {
830 obj = dmu_object_alloc(zfsvfs->z_os,
831 DMU_OT_PLAIN_FILE_CONTENTS, 0,
832 obj_type, bonuslen, tx);
833 }
834 }
835
836 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
837 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
838
839 /*
840 * If this is the root, fix up the half-initialized parent pointer
841 * to reference the just-allocated physical data area.
842 */
843 if (flag & IS_ROOT_NODE) {
844 dzp->z_id = obj;
845 } else {
846 dzp_pflags = dzp->z_pflags;
847 }
848
849 /*
850 * If parent is an xattr, so am I.
851 */
852 if (dzp_pflags & ZFS_XATTR) {
853 flag |= IS_XATTR;
854 }
855
856 if (zfsvfs->z_use_fuids)
857 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
858 else
859 pflags = 0;
860
861 if (vap->va_type == VDIR) {
862 size = 2; /* contents ("." and "..") */
863 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
864 } else {
865 size = links = 0;
866 }
867
868 if (vap->va_type == VBLK || vap->va_type == VCHR) {
869 rdev = zfs_expldev(vap->va_rdev);
870 }
871
872 parent = dzp->z_id;
873 mode = acl_ids->z_mode;
874 if (flag & IS_XATTR)
875 pflags |= ZFS_XATTR;
876
877 /*
878 * No execs denied will be deterimed when zfs_mode_compute() is called.
879 */
880 pflags |= acl_ids->z_aclp->z_hints &
881 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
882 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
883
884 ZFS_TIME_ENCODE(&now, crtime);
885 ZFS_TIME_ENCODE(&now, ctime);
886
887 if (vap->va_mask & AT_ATIME) {
888 ZFS_TIME_ENCODE(&vap->va_atime, atime);
889 } else {
890 ZFS_TIME_ENCODE(&now, atime);
891 }
892
893 if (vap->va_mask & AT_MTIME) {
894 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
895 } else {
896 ZFS_TIME_ENCODE(&now, mtime);
897 }
898
899 /* Now add in all of the "SA" attributes */
900 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
901 &sa_hdl));
902
903 /*
904 * Setup the array of attributes to be replaced/set on the new file
905 *
906 * order for DMU_OT_ZNODE is critical since it needs to be constructed
907 * in the old znode_phys_t format. Don't change this ordering
908 */
909
910 if (obj_type == DMU_OT_ZNODE) {
911 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
912 NULL, &atime, 16);
913 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
914 NULL, &mtime, 16);
915 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
916 NULL, &ctime, 16);
917 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
918 NULL, &crtime, 16);
919 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
920 NULL, &gen, 8);
921 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
922 NULL, &mode, 8);
923 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
924 NULL, &size, 8);
925 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
926 NULL, &parent, 8);
927 } else {
928 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
929 NULL, &mode, 8);
930 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
931 NULL, &size, 8);
932 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
933 NULL, &gen, 8);
934 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
935 &acl_ids->z_fuid, 8);
936 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
937 &acl_ids->z_fgid, 8);
938 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
939 NULL, &parent, 8);
940 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
941 NULL, &pflags, 8);
942 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
943 NULL, &atime, 16);
944 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
945 NULL, &mtime, 16);
946 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
947 NULL, &ctime, 16);
948 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
949 NULL, &crtime, 16);
950 }
951
952 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
953
954 if (obj_type == DMU_OT_ZNODE) {
955 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
956 &empty_xattr, 8);
957 }
958 if (obj_type == DMU_OT_ZNODE ||
959 (vap->va_type == VBLK || vap->va_type == VCHR)) {
960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
961 NULL, &rdev, 8);
962
963 }
964 if (obj_type == DMU_OT_ZNODE) {
965 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
966 NULL, &pflags, 8);
967 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
968 &acl_ids->z_fuid, 8);
969 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
970 &acl_ids->z_fgid, 8);
971 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
972 sizeof (uint64_t) * 4);
973 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
974 &acl_phys, sizeof (zfs_acl_phys_t));
975 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
976 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
977 &acl_ids->z_aclp->z_acl_count, 8);
978 locate.cb_aclp = acl_ids->z_aclp;
979 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
980 zfs_acl_data_locator, &locate,
981 acl_ids->z_aclp->z_acl_bytes);
982 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
983 acl_ids->z_fuid, acl_ids->z_fgid);
984 }
985
986 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
987
988 if (!(flag & IS_ROOT_NODE)) {
989 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
990 ASSERT(*zpp != NULL);
991 } else {
992 /*
993 * If we are creating the root node, the "parent" we
994 * passed in is the znode for the root.
995 */
996 *zpp = dzp;
997
998 (*zpp)->z_sa_hdl = sa_hdl;
999 }
1000
1001 (*zpp)->z_pflags = pflags;
1002 (*zpp)->z_mode = mode;
1003
1004 if (vap->va_mask & AT_XVATTR)
1005 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx);
1006
1007 if (obj_type == DMU_OT_ZNODE ||
1008 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
1009 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
1010 }
1011 if (!(flag & IS_ROOT_NODE)) {
1012 vnode_t *vp;
1013
1014 vp = ZTOV(*zpp);
1015 vp->v_vflag |= VV_FORCEINSMQ;
1016 err = insmntque(vp, zfsvfs->z_vfs);
1017 vp->v_vflag &= ~VV_FORCEINSMQ;
1018 KASSERT(err == 0, ("insmntque() failed: error %d", err));
1019 }
1020 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1021 }
1022
1023 /*
1024 * Update in-core attributes. It is assumed the caller will be doing an
1025 * sa_bulk_update to push the changes out.
1026 */
1027 void
zfs_xvattr_set(znode_t * zp,xvattr_t * xvap,dmu_tx_t * tx)1028 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
1029 {
1030 xoptattr_t *xoap;
1031
1032 xoap = xva_getxoptattr(xvap);
1033 ASSERT(xoap);
1034
1035 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
1036 uint64_t times[2];
1037 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
1038 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
1039 ×, sizeof (times), tx);
1040 XVA_SET_RTN(xvap, XAT_CREATETIME);
1041 }
1042 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
1043 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
1044 zp->z_pflags, tx);
1045 XVA_SET_RTN(xvap, XAT_READONLY);
1046 }
1047 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
1048 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
1049 zp->z_pflags, tx);
1050 XVA_SET_RTN(xvap, XAT_HIDDEN);
1051 }
1052 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
1053 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
1054 zp->z_pflags, tx);
1055 XVA_SET_RTN(xvap, XAT_SYSTEM);
1056 }
1057 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
1058 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
1059 zp->z_pflags, tx);
1060 XVA_SET_RTN(xvap, XAT_ARCHIVE);
1061 }
1062 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
1063 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
1064 zp->z_pflags, tx);
1065 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
1066 }
1067 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
1068 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
1069 zp->z_pflags, tx);
1070 XVA_SET_RTN(xvap, XAT_NOUNLINK);
1071 }
1072 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
1073 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
1074 zp->z_pflags, tx);
1075 XVA_SET_RTN(xvap, XAT_APPENDONLY);
1076 }
1077 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
1078 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
1079 zp->z_pflags, tx);
1080 XVA_SET_RTN(xvap, XAT_NODUMP);
1081 }
1082 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
1083 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
1084 zp->z_pflags, tx);
1085 XVA_SET_RTN(xvap, XAT_OPAQUE);
1086 }
1087 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
1088 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
1089 xoap->xoa_av_quarantined, zp->z_pflags, tx);
1090 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
1091 }
1092 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
1093 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
1094 zp->z_pflags, tx);
1095 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
1096 }
1097 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
1098 zfs_sa_set_scanstamp(zp, xvap, tx);
1099 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
1100 }
1101 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
1102 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
1103 zp->z_pflags, tx);
1104 XVA_SET_RTN(xvap, XAT_REPARSE);
1105 }
1106 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
1107 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
1108 zp->z_pflags, tx);
1109 XVA_SET_RTN(xvap, XAT_OFFLINE);
1110 }
1111 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
1112 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
1113 zp->z_pflags, tx);
1114 XVA_SET_RTN(xvap, XAT_SPARSE);
1115 }
1116 }
1117
1118 int
zfs_zget(zfsvfs_t * zfsvfs,uint64_t obj_num,znode_t ** zpp)1119 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
1120 {
1121 dmu_object_info_t doi;
1122 dmu_buf_t *db;
1123 znode_t *zp;
1124 vnode_t *vp;
1125 sa_handle_t *hdl;
1126 struct thread *td;
1127 int locked;
1128 int err;
1129
1130 td = curthread;
1131 getnewvnode_reserve(1);
1132 again:
1133 *zpp = NULL;
1134 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1135
1136 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1137 if (err) {
1138 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1139 getnewvnode_drop_reserve();
1140 return (err);
1141 }
1142
1143 dmu_object_info_from_db(db, &doi);
1144 if (doi.doi_bonus_type != DMU_OT_SA &&
1145 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1146 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1147 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1148 sa_buf_rele(db, NULL);
1149 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1150 #ifdef __FreeBSD__
1151 getnewvnode_drop_reserve();
1152 #endif
1153 return (SET_ERROR(EINVAL));
1154 }
1155
1156 hdl = dmu_buf_get_user(db);
1157 if (hdl != NULL) {
1158 zp = sa_get_userdata(hdl);
1159
1160
1161 /*
1162 * Since "SA" does immediate eviction we
1163 * should never find a sa handle that doesn't
1164 * know about the znode.
1165 */
1166
1167 ASSERT3P(zp, !=, NULL);
1168
1169 mutex_enter(&zp->z_lock);
1170 ASSERT3U(zp->z_id, ==, obj_num);
1171 if (zp->z_unlinked) {
1172 err = SET_ERROR(ENOENT);
1173 } else {
1174 vp = ZTOV(zp);
1175 *zpp = zp;
1176 err = 0;
1177 }
1178 sa_buf_rele(db, NULL);
1179
1180 /* Don't let the vnode disappear after ZFS_OBJ_HOLD_EXIT. */
1181 if (err == 0)
1182 VN_HOLD(vp);
1183
1184 mutex_exit(&zp->z_lock);
1185 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1186
1187 if (err == 0) {
1188 locked = VOP_ISLOCKED(vp);
1189 VI_LOCK(vp);
1190 if ((vp->v_iflag & VI_DOOMED) != 0 &&
1191 locked != LK_EXCLUSIVE) {
1192 /*
1193 * The vnode is doomed and this thread doesn't
1194 * hold the exclusive lock on it, so the vnode
1195 * must be being reclaimed by another thread.
1196 * Otherwise the doomed vnode is being reclaimed
1197 * by this thread and zfs_zget is called from
1198 * ZIL internals.
1199 */
1200 VI_UNLOCK(vp);
1201 VN_RELE(vp);
1202 goto again;
1203 }
1204 VI_UNLOCK(vp);
1205 }
1206 getnewvnode_drop_reserve();
1207 return (err);
1208 }
1209
1210 /*
1211 * Not found create new znode/vnode
1212 * but only if file exists.
1213 *
1214 * There is a small window where zfs_vget() could
1215 * find this object while a file create is still in
1216 * progress. This is checked for in zfs_znode_alloc()
1217 *
1218 * if zfs_znode_alloc() fails it will drop the hold on the
1219 * bonus buffer.
1220 */
1221 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
1222 doi.doi_bonus_type, NULL);
1223 if (zp == NULL) {
1224 err = SET_ERROR(ENOENT);
1225 } else {
1226 *zpp = zp;
1227 }
1228 if (err == 0) {
1229 vnode_t *vp = ZTOV(zp);
1230
1231 err = insmntque(vp, zfsvfs->z_vfs);
1232 if (err == 0) {
1233 vp->v_hash = obj_num;
1234 VOP_UNLOCK(vp, 0);
1235 } else {
1236 zp->z_vnode = NULL;
1237 zfs_znode_dmu_fini(zp);
1238 zfs_znode_free(zp);
1239 *zpp = NULL;
1240 }
1241 }
1242 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1243 getnewvnode_drop_reserve();
1244 return (err);
1245 }
1246
1247 int
zfs_rezget(znode_t * zp)1248 zfs_rezget(znode_t *zp)
1249 {
1250 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1251 dmu_object_info_t doi;
1252 dmu_buf_t *db;
1253 vnode_t *vp;
1254 uint64_t obj_num = zp->z_id;
1255 uint64_t mode, size;
1256 sa_bulk_attr_t bulk[8];
1257 int err;
1258 int count = 0;
1259 uint64_t gen;
1260
1261 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
1262
1263 mutex_enter(&zp->z_acl_lock);
1264 if (zp->z_acl_cached) {
1265 zfs_acl_free(zp->z_acl_cached);
1266 zp->z_acl_cached = NULL;
1267 }
1268
1269 mutex_exit(&zp->z_acl_lock);
1270 ASSERT(zp->z_sa_hdl == NULL);
1271 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1272 if (err) {
1273 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1274 return (err);
1275 }
1276
1277 dmu_object_info_from_db(db, &doi);
1278 if (doi.doi_bonus_type != DMU_OT_SA &&
1279 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1280 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1281 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1282 sa_buf_rele(db, NULL);
1283 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1284 return (SET_ERROR(EINVAL));
1285 }
1286
1287 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1288 size = zp->z_size;
1289
1290 /* reload cached values */
1291 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1292 &gen, sizeof (gen));
1293 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1294 &zp->z_size, sizeof (zp->z_size));
1295 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1296 &zp->z_links, sizeof (zp->z_links));
1297 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1298 &zp->z_pflags, sizeof (zp->z_pflags));
1299 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1300 &zp->z_atime, sizeof (zp->z_atime));
1301 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1302 &zp->z_uid, sizeof (zp->z_uid));
1303 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1304 &zp->z_gid, sizeof (zp->z_gid));
1305 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1306 &mode, sizeof (mode));
1307
1308 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1309 zfs_znode_dmu_fini(zp);
1310 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1311 return (SET_ERROR(EIO));
1312 }
1313
1314 zp->z_mode = mode;
1315
1316 if (gen != zp->z_gen) {
1317 zfs_znode_dmu_fini(zp);
1318 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1319 return (SET_ERROR(EIO));
1320 }
1321
1322 /*
1323 * It is highly improbable but still quite possible that two
1324 * objects in different datasets are created with the same
1325 * object numbers and in transaction groups with the same
1326 * numbers. znodes corresponding to those objects would
1327 * have the same z_id and z_gen, but their other attributes
1328 * may be different.
1329 * zfs recv -F may replace one of such objects with the other.
1330 * As a result file properties recorded in the replaced
1331 * object's vnode may no longer match the received object's
1332 * properties. At present the only cached property is the
1333 * files type recorded in v_type.
1334 * So, handle this case by leaving the old vnode and znode
1335 * disassociated from the actual object. A new vnode and a
1336 * znode will be created if the object is accessed
1337 * (e.g. via a look-up). The old vnode and znode will be
1338 * recycled when the last vnode reference is dropped.
1339 */
1340 vp = ZTOV(zp);
1341 if (vp != NULL && vp->v_type != IFTOVT((mode_t)zp->z_mode)) {
1342 zfs_znode_dmu_fini(zp);
1343 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1344 return (EIO);
1345 }
1346
1347 zp->z_unlinked = (zp->z_links == 0);
1348 zp->z_blksz = doi.doi_data_block_size;
1349 if (vp != NULL) {
1350 vn_pages_remove(vp, 0, 0);
1351 if (zp->z_size != size)
1352 vnode_pager_setsize(vp, zp->z_size);
1353 }
1354
1355 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
1356
1357 return (0);
1358 }
1359
1360 void
zfs_znode_delete(znode_t * zp,dmu_tx_t * tx)1361 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1362 {
1363 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1364 objset_t *os = zfsvfs->z_os;
1365 uint64_t obj = zp->z_id;
1366 uint64_t acl_obj = zfs_external_acl(zp);
1367
1368 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
1369 if (acl_obj) {
1370 VERIFY(!zp->z_is_sa);
1371 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1372 }
1373 VERIFY(0 == dmu_object_free(os, obj, tx));
1374 zfs_znode_dmu_fini(zp);
1375 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
1376 zfs_znode_free(zp);
1377 }
1378
1379 void
zfs_zinactive(znode_t * zp)1380 zfs_zinactive(znode_t *zp)
1381 {
1382 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1383 uint64_t z_id = zp->z_id;
1384
1385 ASSERT(zp->z_sa_hdl);
1386
1387 /*
1388 * Don't allow a zfs_zget() while were trying to release this znode
1389 */
1390 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
1391
1392 mutex_enter(&zp->z_lock);
1393
1394 /*
1395 * If this was the last reference to a file with no links,
1396 * remove the file from the file system.
1397 */
1398 if (zp->z_unlinked) {
1399 mutex_exit(&zp->z_lock);
1400 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1401 zfs_rmnode(zp);
1402 return;
1403 }
1404
1405 mutex_exit(&zp->z_lock);
1406 zfs_znode_dmu_fini(zp);
1407 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
1408 zfs_znode_free(zp);
1409 }
1410
1411 void
zfs_znode_free(znode_t * zp)1412 zfs_znode_free(znode_t *zp)
1413 {
1414 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1415
1416 ASSERT(zp->z_sa_hdl == NULL);
1417 zp->z_vnode = NULL;
1418 mutex_enter(&zfsvfs->z_znodes_lock);
1419 POINTER_INVALIDATE(&zp->z_zfsvfs);
1420 list_remove(&zfsvfs->z_all_znodes, zp);
1421 mutex_exit(&zfsvfs->z_znodes_lock);
1422
1423 if (zp->z_acl_cached) {
1424 zfs_acl_free(zp->z_acl_cached);
1425 zp->z_acl_cached = NULL;
1426 }
1427
1428 kmem_cache_free(znode_cache, zp);
1429
1430 VFS_RELE(zfsvfs->z_vfs);
1431 }
1432
1433 void
zfs_tstamp_update_setup(znode_t * zp,uint_t flag,uint64_t mtime[2],uint64_t ctime[2],boolean_t have_tx)1434 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1435 uint64_t ctime[2], boolean_t have_tx)
1436 {
1437 timestruc_t now;
1438
1439 gethrestime(&now);
1440
1441 if (have_tx) { /* will sa_bulk_update happen really soon? */
1442 zp->z_atime_dirty = 0;
1443 zp->z_seq++;
1444 } else {
1445 zp->z_atime_dirty = 1;
1446 }
1447
1448 if (flag & AT_ATIME) {
1449 ZFS_TIME_ENCODE(&now, zp->z_atime);
1450 }
1451
1452 if (flag & AT_MTIME) {
1453 ZFS_TIME_ENCODE(&now, mtime);
1454 if (zp->z_zfsvfs->z_use_fuids) {
1455 zp->z_pflags |= (ZFS_ARCHIVE |
1456 ZFS_AV_MODIFIED);
1457 }
1458 }
1459
1460 if (flag & AT_CTIME) {
1461 ZFS_TIME_ENCODE(&now, ctime);
1462 if (zp->z_zfsvfs->z_use_fuids)
1463 zp->z_pflags |= ZFS_ARCHIVE;
1464 }
1465 }
1466
1467 /*
1468 * Grow the block size for a file.
1469 *
1470 * IN: zp - znode of file to free data in.
1471 * size - requested block size
1472 * tx - open transaction.
1473 *
1474 * NOTE: this function assumes that the znode is write locked.
1475 */
1476 void
zfs_grow_blocksize(znode_t * zp,uint64_t size,dmu_tx_t * tx)1477 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1478 {
1479 int error;
1480 u_longlong_t dummy;
1481
1482 if (size <= zp->z_blksz)
1483 return;
1484 /*
1485 * If the file size is already greater than the current blocksize,
1486 * we will not grow. If there is more than one block in a file,
1487 * the blocksize cannot change.
1488 */
1489 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1490 return;
1491
1492 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
1493 size, 0, tx);
1494
1495 if (error == ENOTSUP)
1496 return;
1497 ASSERT0(error);
1498
1499 /* What blocksize did we actually get? */
1500 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1501 }
1502
1503 #ifdef sun
1504 /*
1505 * This is a dummy interface used when pvn_vplist_dirty() should *not*
1506 * be calling back into the fs for a putpage(). E.g.: when truncating
1507 * a file, the pages being "thrown away* don't need to be written out.
1508 */
1509 /* ARGSUSED */
1510 static int
zfs_no_putpage(vnode_t * vp,page_t * pp,u_offset_t * offp,size_t * lenp,int flags,cred_t * cr)1511 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
1512 int flags, cred_t *cr)
1513 {
1514 ASSERT(0);
1515 return (0);
1516 }
1517 #endif /* sun */
1518
1519 /*
1520 * Increase the file length
1521 *
1522 * IN: zp - znode of file to free data in.
1523 * end - new end-of-file
1524 *
1525 * RETURN: 0 on success, error code on failure
1526 */
1527 static int
zfs_extend(znode_t * zp,uint64_t end)1528 zfs_extend(znode_t *zp, uint64_t end)
1529 {
1530 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1531 dmu_tx_t *tx;
1532 rl_t *rl;
1533 uint64_t newblksz;
1534 int error;
1535
1536 /*
1537 * We will change zp_size, lock the whole file.
1538 */
1539 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1540
1541 /*
1542 * Nothing to do if file already at desired length.
1543 */
1544 if (end <= zp->z_size) {
1545 zfs_range_unlock(rl);
1546 return (0);
1547 }
1548 tx = dmu_tx_create(zfsvfs->z_os);
1549 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1550 zfs_sa_upgrade_txholds(tx, zp);
1551 if (end > zp->z_blksz &&
1552 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1553 /*
1554 * We are growing the file past the current block size.
1555 */
1556 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
1557 /*
1558 * File's blocksize is already larger than the
1559 * "recordsize" property. Only let it grow to
1560 * the next power of 2.
1561 */
1562 ASSERT(!ISP2(zp->z_blksz));
1563 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1564 } else {
1565 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
1566 }
1567 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1568 } else {
1569 newblksz = 0;
1570 }
1571
1572 error = dmu_tx_assign(tx, TXG_WAIT);
1573 if (error) {
1574 dmu_tx_abort(tx);
1575 zfs_range_unlock(rl);
1576 return (error);
1577 }
1578
1579 if (newblksz)
1580 zfs_grow_blocksize(zp, newblksz, tx);
1581
1582 zp->z_size = end;
1583
1584 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
1585 &zp->z_size, sizeof (zp->z_size), tx));
1586
1587 vnode_pager_setsize(ZTOV(zp), end);
1588
1589 zfs_range_unlock(rl);
1590
1591 dmu_tx_commit(tx);
1592
1593 return (0);
1594 }
1595
1596 /*
1597 * Free space in a file.
1598 *
1599 * IN: zp - znode of file to free data in.
1600 * off - start of section to free.
1601 * len - length of section to free.
1602 *
1603 * RETURN: 0 on success, error code on failure
1604 */
1605 static int
zfs_free_range(znode_t * zp,uint64_t off,uint64_t len)1606 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1607 {
1608 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1609 rl_t *rl;
1610 int error;
1611
1612 /*
1613 * Lock the range being freed.
1614 */
1615 rl = zfs_range_lock(zp, off, len, RL_WRITER);
1616
1617 /*
1618 * Nothing to do if file already at desired length.
1619 */
1620 if (off >= zp->z_size) {
1621 zfs_range_unlock(rl);
1622 return (0);
1623 }
1624
1625 if (off + len > zp->z_size)
1626 len = zp->z_size - off;
1627
1628 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1629
1630 if (error == 0) {
1631 /*
1632 * In FreeBSD we cannot free block in the middle of a file,
1633 * but only at the end of a file, so this code path should
1634 * never happen.
1635 */
1636 vnode_pager_setsize(ZTOV(zp), off);
1637 }
1638
1639 zfs_range_unlock(rl);
1640
1641 return (error);
1642 }
1643
1644 /*
1645 * Truncate a file
1646 *
1647 * IN: zp - znode of file to free data in.
1648 * end - new end-of-file.
1649 *
1650 * RETURN: 0 on success, error code on failure
1651 */
1652 static int
zfs_trunc(znode_t * zp,uint64_t end)1653 zfs_trunc(znode_t *zp, uint64_t end)
1654 {
1655 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1656 vnode_t *vp = ZTOV(zp);
1657 dmu_tx_t *tx;
1658 rl_t *rl;
1659 int error;
1660 sa_bulk_attr_t bulk[2];
1661 int count = 0;
1662
1663 /*
1664 * We will change zp_size, lock the whole file.
1665 */
1666 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1667
1668 /*
1669 * Nothing to do if file already at desired length.
1670 */
1671 if (end >= zp->z_size) {
1672 zfs_range_unlock(rl);
1673 return (0);
1674 }
1675
1676 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1);
1677 if (error) {
1678 zfs_range_unlock(rl);
1679 return (error);
1680 }
1681 tx = dmu_tx_create(zfsvfs->z_os);
1682 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1683 zfs_sa_upgrade_txholds(tx, zp);
1684 dmu_tx_mark_netfree(tx);
1685 error = dmu_tx_assign(tx, TXG_WAIT);
1686 if (error) {
1687 dmu_tx_abort(tx);
1688 zfs_range_unlock(rl);
1689 return (error);
1690 }
1691
1692 zp->z_size = end;
1693 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1694 NULL, &zp->z_size, sizeof (zp->z_size));
1695
1696 if (end == 0) {
1697 zp->z_pflags &= ~ZFS_SPARSE;
1698 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1699 NULL, &zp->z_pflags, 8);
1700 }
1701 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1702
1703 dmu_tx_commit(tx);
1704
1705 /*
1706 * Clear any mapped pages in the truncated region. This has to
1707 * happen outside of the transaction to avoid the possibility of
1708 * a deadlock with someone trying to push a page that we are
1709 * about to invalidate.
1710 */
1711 vnode_pager_setsize(vp, end);
1712
1713 zfs_range_unlock(rl);
1714
1715 return (0);
1716 }
1717
1718 /*
1719 * Free space in a file
1720 *
1721 * IN: zp - znode of file to free data in.
1722 * off - start of range
1723 * len - end of range (0 => EOF)
1724 * flag - current file open mode flags.
1725 * log - TRUE if this action should be logged
1726 *
1727 * RETURN: 0 on success, error code on failure
1728 */
1729 int
zfs_freesp(znode_t * zp,uint64_t off,uint64_t len,int flag,boolean_t log)1730 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1731 {
1732 vnode_t *vp = ZTOV(zp);
1733 dmu_tx_t *tx;
1734 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1735 zilog_t *zilog = zfsvfs->z_log;
1736 uint64_t mode;
1737 uint64_t mtime[2], ctime[2];
1738 sa_bulk_attr_t bulk[3];
1739 int count = 0;
1740 int error;
1741
1742 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1743 sizeof (mode))) != 0)
1744 return (error);
1745
1746 if (off > zp->z_size) {
1747 error = zfs_extend(zp, off+len);
1748 if (error == 0 && log)
1749 goto log;
1750 else
1751 return (error);
1752 }
1753
1754 /*
1755 * Check for any locks in the region to be freed.
1756 */
1757
1758 if (MANDLOCK(vp, (mode_t)mode)) {
1759 uint64_t length = (len ? len : zp->z_size - off);
1760 if (error = chklock(vp, FWRITE, off, length, flag, NULL))
1761 return (error);
1762 }
1763
1764 if (len == 0) {
1765 error = zfs_trunc(zp, off);
1766 } else {
1767 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1768 off + len > zp->z_size)
1769 error = zfs_extend(zp, off+len);
1770 }
1771 if (error || !log)
1772 return (error);
1773 log:
1774 tx = dmu_tx_create(zfsvfs->z_os);
1775 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1776 zfs_sa_upgrade_txholds(tx, zp);
1777 error = dmu_tx_assign(tx, TXG_WAIT);
1778 if (error) {
1779 dmu_tx_abort(tx);
1780 return (error);
1781 }
1782
1783 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1784 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1785 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1786 NULL, &zp->z_pflags, 8);
1787 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
1788 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1789 ASSERT(error == 0);
1790
1791 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1792
1793 dmu_tx_commit(tx);
1794 return (0);
1795 }
1796
1797 void
zfs_create_fs(objset_t * os,cred_t * cr,nvlist_t * zplprops,dmu_tx_t * tx)1798 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1799 {
1800 zfsvfs_t zfsvfs;
1801 uint64_t moid, obj, sa_obj, version;
1802 uint64_t sense = ZFS_CASE_SENSITIVE;
1803 uint64_t norm = 0;
1804 nvpair_t *elem;
1805 int error;
1806 int i;
1807 znode_t *rootzp = NULL;
1808 vattr_t vattr;
1809 znode_t *zp;
1810 zfs_acl_ids_t acl_ids;
1811
1812 /*
1813 * First attempt to create master node.
1814 */
1815 /*
1816 * In an empty objset, there are no blocks to read and thus
1817 * there can be no i/o errors (which we assert below).
1818 */
1819 moid = MASTER_NODE_OBJ;
1820 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1821 DMU_OT_NONE, 0, tx);
1822 ASSERT(error == 0);
1823
1824 /*
1825 * Set starting attributes.
1826 */
1827 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1828 elem = NULL;
1829 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1830 /* For the moment we expect all zpl props to be uint64_ts */
1831 uint64_t val;
1832 char *name;
1833
1834 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1835 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1836 name = nvpair_name(elem);
1837 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1838 if (val < version)
1839 version = val;
1840 } else {
1841 error = zap_update(os, moid, name, 8, 1, &val, tx);
1842 }
1843 ASSERT(error == 0);
1844 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1845 norm = val;
1846 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1847 sense = val;
1848 }
1849 ASSERT(version != 0);
1850 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1851
1852 /*
1853 * Create zap object used for SA attribute registration
1854 */
1855
1856 if (version >= ZPL_VERSION_SA) {
1857 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1858 DMU_OT_NONE, 0, tx);
1859 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1860 ASSERT(error == 0);
1861 } else {
1862 sa_obj = 0;
1863 }
1864 /*
1865 * Create a delete queue.
1866 */
1867 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1868
1869 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1870 ASSERT(error == 0);
1871
1872 /*
1873 * Create root znode. Create minimal znode/vnode/zfsvfs
1874 * to allow zfs_mknode to work.
1875 */
1876 VATTR_NULL(&vattr);
1877 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
1878 vattr.va_type = VDIR;
1879 vattr.va_mode = S_IFDIR|0755;
1880 vattr.va_uid = crgetuid(cr);
1881 vattr.va_gid = crgetgid(cr);
1882
1883 bzero(&zfsvfs, sizeof (zfsvfs_t));
1884
1885 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1886 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
1887 rootzp->z_moved = 0;
1888 rootzp->z_unlinked = 0;
1889 rootzp->z_atime_dirty = 0;
1890 rootzp->z_is_sa = USE_SA(version, os);
1891
1892 zfsvfs.z_os = os;
1893 zfsvfs.z_parent = &zfsvfs;
1894 zfsvfs.z_version = version;
1895 zfsvfs.z_use_fuids = USE_FUIDS(version, os);
1896 zfsvfs.z_use_sa = USE_SA(version, os);
1897 zfsvfs.z_norm = norm;
1898
1899 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1900 &zfsvfs.z_attr_table);
1901
1902 ASSERT(error == 0);
1903
1904 /*
1905 * Fold case on file systems that are always or sometimes case
1906 * insensitive.
1907 */
1908 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1909 zfsvfs.z_norm |= U8_TEXTPREP_TOUPPER;
1910
1911 mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1912 list_create(&zfsvfs.z_all_znodes, sizeof (znode_t),
1913 offsetof(znode_t, z_link_node));
1914
1915 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1916 mutex_init(&zfsvfs.z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1917
1918 rootzp->z_zfsvfs = &zfsvfs;
1919 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1920 cr, NULL, &acl_ids));
1921 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1922 ASSERT3P(zp, ==, rootzp);
1923 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1924 ASSERT(error == 0);
1925 zfs_acl_ids_free(&acl_ids);
1926 POINTER_INVALIDATE(&rootzp->z_zfsvfs);
1927
1928 sa_handle_destroy(rootzp->z_sa_hdl);
1929 kmem_cache_free(znode_cache, rootzp);
1930
1931 /*
1932 * Create shares directory
1933 */
1934
1935 error = zfs_create_share_dir(&zfsvfs, tx);
1936
1937 ASSERT(error == 0);
1938
1939 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1940 mutex_destroy(&zfsvfs.z_hold_mtx[i]);
1941 }
1942
1943 #endif /* _KERNEL */
1944
1945 static int
zfs_sa_setup(objset_t * osp,sa_attr_type_t ** sa_table)1946 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1947 {
1948 uint64_t sa_obj = 0;
1949 int error;
1950
1951 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1952 if (error != 0 && error != ENOENT)
1953 return (error);
1954
1955 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1956 return (error);
1957 }
1958
1959 static int
zfs_grab_sa_handle(objset_t * osp,uint64_t obj,sa_handle_t ** hdlp,dmu_buf_t ** db,void * tag)1960 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
1961 dmu_buf_t **db, void *tag)
1962 {
1963 dmu_object_info_t doi;
1964 int error;
1965
1966 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
1967 return (error);
1968
1969 dmu_object_info_from_db(*db, &doi);
1970 if ((doi.doi_bonus_type != DMU_OT_SA &&
1971 doi.doi_bonus_type != DMU_OT_ZNODE) ||
1972 doi.doi_bonus_type == DMU_OT_ZNODE &&
1973 doi.doi_bonus_size < sizeof (znode_phys_t)) {
1974 sa_buf_rele(*db, tag);
1975 return (SET_ERROR(ENOTSUP));
1976 }
1977
1978 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
1979 if (error != 0) {
1980 sa_buf_rele(*db, tag);
1981 return (error);
1982 }
1983
1984 return (0);
1985 }
1986
1987 void
zfs_release_sa_handle(sa_handle_t * hdl,dmu_buf_t * db,void * tag)1988 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
1989 {
1990 sa_handle_destroy(hdl);
1991 sa_buf_rele(db, tag);
1992 }
1993
1994 /*
1995 * Given an object number, return its parent object number and whether
1996 * or not the object is an extended attribute directory.
1997 */
1998 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)1999 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
2000 uint64_t *pobjp, int *is_xattrdir)
2001 {
2002 uint64_t parent;
2003 uint64_t pflags;
2004 uint64_t mode;
2005 uint64_t parent_mode;
2006 sa_bulk_attr_t bulk[3];
2007 sa_handle_t *sa_hdl;
2008 dmu_buf_t *sa_db;
2009 int count = 0;
2010 int error;
2011
2012 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
2013 &parent, sizeof (parent));
2014 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
2015 &pflags, sizeof (pflags));
2016 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2017 &mode, sizeof (mode));
2018
2019 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
2020 return (error);
2021
2022 /*
2023 * When a link is removed its parent pointer is not changed and will
2024 * be invalid. There are two cases where a link is removed but the
2025 * file stays around, when it goes to the delete queue and when there
2026 * are additional links.
2027 */
2028 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
2029 if (error != 0)
2030 return (error);
2031
2032 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
2033 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2034 if (error != 0)
2035 return (error);
2036
2037 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
2038
2039 /*
2040 * Extended attributes can be applied to files, directories, etc.
2041 * Otherwise the parent must be a directory.
2042 */
2043 if (!*is_xattrdir && !S_ISDIR(parent_mode))
2044 return (SET_ERROR(EINVAL));
2045
2046 *pobjp = parent;
2047
2048 return (0);
2049 }
2050
2051 /*
2052 * Given an object number, return some zpl level statistics
2053 */
2054 static int
zfs_obj_to_stats_impl(sa_handle_t * hdl,sa_attr_type_t * sa_table,zfs_stat_t * sb)2055 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
2056 zfs_stat_t *sb)
2057 {
2058 sa_bulk_attr_t bulk[4];
2059 int count = 0;
2060
2061 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2062 &sb->zs_mode, sizeof (sb->zs_mode));
2063 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
2064 &sb->zs_gen, sizeof (sb->zs_gen));
2065 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
2066 &sb->zs_links, sizeof (sb->zs_links));
2067 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
2068 &sb->zs_ctime, sizeof (sb->zs_ctime));
2069
2070 return (sa_bulk_lookup(hdl, bulk, count));
2071 }
2072
2073 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)2074 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
2075 sa_attr_type_t *sa_table, char *buf, int len)
2076 {
2077 sa_handle_t *sa_hdl;
2078 sa_handle_t *prevhdl = NULL;
2079 dmu_buf_t *prevdb = NULL;
2080 dmu_buf_t *sa_db = NULL;
2081 char *path = buf + len - 1;
2082 int error;
2083
2084 *path = '\0';
2085 sa_hdl = hdl;
2086
2087 for (;;) {
2088 uint64_t pobj;
2089 char component[MAXNAMELEN + 2];
2090 size_t complen;
2091 int is_xattrdir;
2092
2093 if (prevdb)
2094 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
2095
2096 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
2097 &is_xattrdir)) != 0)
2098 break;
2099
2100 if (pobj == obj) {
2101 if (path[0] != '/')
2102 *--path = '/';
2103 break;
2104 }
2105
2106 component[0] = '/';
2107 if (is_xattrdir) {
2108 (void) sprintf(component + 1, "<xattrdir>");
2109 } else {
2110 error = zap_value_search(osp, pobj, obj,
2111 ZFS_DIRENT_OBJ(-1ULL), component + 1);
2112 if (error != 0)
2113 break;
2114 }
2115
2116 complen = strlen(component);
2117 path -= complen;
2118 ASSERT(path >= buf);
2119 bcopy(component, path, complen);
2120 obj = pobj;
2121
2122 if (sa_hdl != hdl) {
2123 prevhdl = sa_hdl;
2124 prevdb = sa_db;
2125 }
2126 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
2127 if (error != 0) {
2128 sa_hdl = prevhdl;
2129 sa_db = prevdb;
2130 break;
2131 }
2132 }
2133
2134 if (sa_hdl != NULL && sa_hdl != hdl) {
2135 ASSERT(sa_db != NULL);
2136 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2137 }
2138
2139 if (error == 0)
2140 (void) memmove(buf, path, buf + len - path);
2141
2142 return (error);
2143 }
2144
2145 int
zfs_obj_to_path(objset_t * osp,uint64_t obj,char * buf,int len)2146 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
2147 {
2148 sa_attr_type_t *sa_table;
2149 sa_handle_t *hdl;
2150 dmu_buf_t *db;
2151 int error;
2152
2153 error = zfs_sa_setup(osp, &sa_table);
2154 if (error != 0)
2155 return (error);
2156
2157 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2158 if (error != 0)
2159 return (error);
2160
2161 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2162
2163 zfs_release_sa_handle(hdl, db, FTAG);
2164 return (error);
2165 }
2166
2167 int
zfs_obj_to_stats(objset_t * osp,uint64_t obj,zfs_stat_t * sb,char * buf,int len)2168 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
2169 char *buf, int len)
2170 {
2171 char *path = buf + len - 1;
2172 sa_attr_type_t *sa_table;
2173 sa_handle_t *hdl;
2174 dmu_buf_t *db;
2175 int error;
2176
2177 *path = '\0';
2178
2179 error = zfs_sa_setup(osp, &sa_table);
2180 if (error != 0)
2181 return (error);
2182
2183 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2184 if (error != 0)
2185 return (error);
2186
2187 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
2188 if (error != 0) {
2189 zfs_release_sa_handle(hdl, db, FTAG);
2190 return (error);
2191 }
2192
2193 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2194
2195 zfs_release_sa_handle(hdl, db, FTAG);
2196 return (error);
2197 }
2198