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[mirror_zfs.git] / module / zfs / zfs_znode.c
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 by Delphix. All rights reserved.
24 */
25
26 /* Portions Copyright 2007 Jeremy Teo */
27
28 #ifdef _KERNEL
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/time.h>
32 #include <sys/systm.h>
33 #include <sys/sysmacros.h>
34 #include <sys/resource.h>
35 #include <sys/mntent.h>
36 #include <sys/mkdev.h>
37 #include <sys/u8_textprep.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/vfs.h>
40 #include <sys/vfs_opreg.h>
41 #include <sys/vnode.h>
42 #include <sys/file.h>
43 #include <sys/kmem.h>
44 #include <sys/errno.h>
45 #include <sys/unistd.h>
46 #include <sys/mode.h>
47 #include <sys/atomic.h>
48 #include <vm/pvn.h>
49 #include "fs/fs_subr.h"
50 #include <sys/zfs_dir.h>
51 #include <sys/zfs_acl.h>
52 #include <sys/zfs_ioctl.h>
53 #include <sys/zfs_rlock.h>
54 #include <sys/zfs_fuid.h>
55 #include <sys/zfs_vnops.h>
56 #include <sys/zfs_ctldir.h>
57 #include <sys/dnode.h>
58 #include <sys/fs/zfs.h>
59 #include <sys/kidmap.h>
60 #include <sys/zpl.h>
61 #endif /* _KERNEL */
62
63 #include <sys/dmu.h>
64 #include <sys/refcount.h>
65 #include <sys/stat.h>
66 #include <sys/zap.h>
67 #include <sys/zfs_znode.h>
68 #include <sys/sa.h>
69 #include <sys/zfs_sa.h>
70 #include <sys/zfs_stat.h>
71
72 #include "zfs_prop.h"
73 #include "zfs_comutil.h"
74
75 /*
76 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only
77 * turned on when DEBUG is also defined.
78 */
79 #ifdef DEBUG
80 #define ZNODE_STATS
81 #endif /* DEBUG */
82
83 #ifdef ZNODE_STATS
84 #define ZNODE_STAT_ADD(stat) ((stat)++)
85 #else
86 #define ZNODE_STAT_ADD(stat) /* nothing */
87 #endif /* ZNODE_STATS */
88
89 /*
90 * Functions needed for userland (ie: libzpool) are not put under
91 * #ifdef_KERNEL; the rest of the functions have dependencies
92 * (such as VFS logic) that will not compile easily in userland.
93 */
94 #ifdef _KERNEL
95
96 static kmem_cache_t *znode_cache = NULL;
97
98 /*ARGSUSED*/
99 static int
100 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
101 {
102 znode_t *zp = buf;
103
104 inode_init_once(ZTOI(zp));
105 list_link_init(&zp->z_link_node);
106
107 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
108 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
109 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
110 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
111 rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);
112
113 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
114 avl_create(&zp->z_range_avl, zfs_range_compare,
115 sizeof (rl_t), offsetof(rl_t, r_node));
116
117 zp->z_dirlocks = NULL;
118 zp->z_acl_cached = NULL;
119 zp->z_xattr_cached = NULL;
120 zp->z_xattr_parent = NULL;
121 zp->z_moved = 0;
122 return (0);
123 }
124
125 /*ARGSUSED*/
126 static void
127 zfs_znode_cache_destructor(void *buf, void *arg)
128 {
129 znode_t *zp = buf;
130
131 ASSERT(!list_link_active(&zp->z_link_node));
132 mutex_destroy(&zp->z_lock);
133 rw_destroy(&zp->z_parent_lock);
134 rw_destroy(&zp->z_name_lock);
135 mutex_destroy(&zp->z_acl_lock);
136 rw_destroy(&zp->z_xattr_lock);
137 avl_destroy(&zp->z_range_avl);
138 mutex_destroy(&zp->z_range_lock);
139
140 ASSERT(zp->z_dirlocks == NULL);
141 ASSERT(zp->z_acl_cached == NULL);
142 ASSERT(zp->z_xattr_cached == NULL);
143 ASSERT(zp->z_xattr_parent == NULL);
144 }
145
146 void
147 zfs_znode_init(void)
148 {
149 /*
150 * Initialize zcache
151 */
152 ASSERT(znode_cache == NULL);
153 znode_cache = kmem_cache_create("zfs_znode_cache",
154 sizeof (znode_t), 0, zfs_znode_cache_constructor,
155 zfs_znode_cache_destructor, NULL, NULL, NULL, KMC_KMEM);
156 }
157
158 void
159 zfs_znode_fini(void)
160 {
161 /*
162 * Cleanup zcache
163 */
164 if (znode_cache)
165 kmem_cache_destroy(znode_cache);
166 znode_cache = NULL;
167 }
168
169 int
170 zfs_create_share_dir(zfs_sb_t *zsb, dmu_tx_t *tx)
171 {
172 #ifdef HAVE_SMB_SHARE
173 zfs_acl_ids_t acl_ids;
174 vattr_t vattr;
175 znode_t *sharezp;
176 vnode_t *vp;
177 znode_t *zp;
178 int error;
179
180 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
181 vattr.va_mode = S_IFDIR | 0555;
182 vattr.va_uid = crgetuid(kcred);
183 vattr.va_gid = crgetgid(kcred);
184
185 sharezp = kmem_cache_alloc(znode_cache, KM_PUSHPAGE);
186 sharezp->z_moved = 0;
187 sharezp->z_unlinked = 0;
188 sharezp->z_atime_dirty = 0;
189 sharezp->z_zfsvfs = zfsvfs;
190 sharezp->z_is_sa = zfsvfs->z_use_sa;
191
192 vp = ZTOV(sharezp);
193 vn_reinit(vp);
194 vp->v_type = VDIR;
195
196 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
197 kcred, NULL, &acl_ids));
198 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
199 ASSERT3P(zp, ==, sharezp);
200 ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
201 POINTER_INVALIDATE(&sharezp->z_zfsvfs);
202 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
203 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
204 zfsvfs->z_shares_dir = sharezp->z_id;
205
206 zfs_acl_ids_free(&acl_ids);
207 // ZTOV(sharezp)->v_count = 0;
208 sa_handle_destroy(sharezp->z_sa_hdl);
209 kmem_cache_free(znode_cache, sharezp);
210
211 return (error);
212 #else
213 return (0);
214 #endif /* HAVE_SMB_SHARE */
215 }
216
217 static void
218 zfs_znode_sa_init(zfs_sb_t *zsb, znode_t *zp,
219 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
220 {
221 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zsb, zp->z_id)));
222
223 mutex_enter(&zp->z_lock);
224
225 ASSERT(zp->z_sa_hdl == NULL);
226 ASSERT(zp->z_acl_cached == NULL);
227 if (sa_hdl == NULL) {
228 VERIFY(0 == sa_handle_get_from_db(zsb->z_os, db, zp,
229 SA_HDL_SHARED, &zp->z_sa_hdl));
230 } else {
231 zp->z_sa_hdl = sa_hdl;
232 sa_set_userp(sa_hdl, zp);
233 }
234
235 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
236
237 mutex_exit(&zp->z_lock);
238 }
239
240 void
241 zfs_znode_dmu_fini(znode_t *zp)
242 {
243 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(ZTOZSB(zp), zp->z_id)) ||
244 zp->z_unlinked ||
245 RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock));
246
247 sa_handle_destroy(zp->z_sa_hdl);
248 zp->z_sa_hdl = NULL;
249 }
250
251 /*
252 * Called by new_inode() to allocate a new inode.
253 */
254 int
255 zfs_inode_alloc(struct super_block *sb, struct inode **ip)
256 {
257 znode_t *zp;
258
259 zp = kmem_cache_alloc(znode_cache, KM_PUSHPAGE);
260 *ip = ZTOI(zp);
261
262 return (0);
263 }
264
265 /*
266 * Called in multiple places when an inode should be destroyed.
267 */
268 void
269 zfs_inode_destroy(struct inode *ip)
270 {
271 znode_t *zp = ITOZ(ip);
272 zfs_sb_t *zsb = ZTOZSB(zp);
273
274 if (zfsctl_is_node(ip))
275 zfsctl_inode_destroy(ip);
276
277 mutex_enter(&zsb->z_znodes_lock);
278 if (list_link_active(&zp->z_link_node)) {
279 list_remove(&zsb->z_all_znodes, zp);
280 zsb->z_nr_znodes--;
281 }
282 mutex_exit(&zsb->z_znodes_lock);
283
284 if (zp->z_acl_cached) {
285 zfs_acl_free(zp->z_acl_cached);
286 zp->z_acl_cached = NULL;
287 }
288
289 if (zp->z_xattr_cached) {
290 nvlist_free(zp->z_xattr_cached);
291 zp->z_xattr_cached = NULL;
292 }
293
294 if (zp->z_xattr_parent) {
295 iput(ZTOI(zp->z_xattr_parent));
296 zp->z_xattr_parent = NULL;
297 }
298
299 kmem_cache_free(znode_cache, zp);
300 }
301
302 static void
303 zfs_inode_set_ops(zfs_sb_t *zsb, struct inode *ip)
304 {
305 uint64_t rdev = 0;
306
307 switch (ip->i_mode & S_IFMT) {
308 case S_IFREG:
309 ip->i_op = &zpl_inode_operations;
310 ip->i_fop = &zpl_file_operations;
311 ip->i_mapping->a_ops = &zpl_address_space_operations;
312 break;
313
314 case S_IFDIR:
315 ip->i_op = &zpl_dir_inode_operations;
316 ip->i_fop = &zpl_dir_file_operations;
317 ITOZ(ip)->z_zn_prefetch = B_TRUE;
318 break;
319
320 case S_IFLNK:
321 ip->i_op = &zpl_symlink_inode_operations;
322 break;
323
324 /*
325 * rdev is only stored in a SA only for device files.
326 */
327 case S_IFCHR:
328 case S_IFBLK:
329 VERIFY(sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zsb),
330 &rdev, sizeof (rdev)) == 0);
331 /*FALLTHROUGH*/
332 case S_IFIFO:
333 case S_IFSOCK:
334 init_special_inode(ip, ip->i_mode, rdev);
335 ip->i_op = &zpl_special_inode_operations;
336 break;
337
338 default:
339 printk("ZFS: Invalid mode: 0x%x\n", ip->i_mode);
340 VERIFY(0);
341 }
342 }
343
344 /*
345 * Construct a znode+inode and initialize.
346 *
347 * This does not do a call to dmu_set_user() that is
348 * up to the caller to do, in case you don't want to
349 * return the znode
350 */
351 static znode_t *
352 zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz,
353 dmu_object_type_t obj_type, uint64_t obj, sa_handle_t *hdl,
354 struct inode *dip)
355 {
356 znode_t *zp;
357 struct inode *ip;
358 uint64_t parent;
359 sa_bulk_attr_t bulk[9];
360 int count = 0;
361
362 ASSERT(zsb != NULL);
363
364 ip = new_inode(zsb->z_sb);
365 if (ip == NULL)
366 return (NULL);
367
368 zp = ITOZ(ip);
369 ASSERT(zp->z_dirlocks == NULL);
370 ASSERT3P(zp->z_acl_cached, ==, NULL);
371 ASSERT3P(zp->z_xattr_cached, ==, NULL);
372 ASSERT3P(zp->z_xattr_parent, ==, NULL);
373 zp->z_moved = 0;
374 zp->z_sa_hdl = NULL;
375 zp->z_unlinked = 0;
376 zp->z_atime_dirty = 0;
377 zp->z_mapcnt = 0;
378 zp->z_id = db->db_object;
379 zp->z_blksz = blksz;
380 zp->z_seq = 0x7A4653;
381 zp->z_sync_cnt = 0;
382 zp->z_is_zvol = B_FALSE;
383 zp->z_is_mapped = B_FALSE;
384 zp->z_is_ctldir = B_FALSE;
385 zp->z_is_stale = B_FALSE;
386
387 zfs_znode_sa_init(zsb, zp, db, obj_type, hdl);
388
389 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL, &zp->z_mode, 8);
390 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zsb), NULL, &zp->z_gen, 8);
391 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb), NULL, &zp->z_size, 8);
392 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb), NULL, &zp->z_links, 8);
393 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
394 &zp->z_pflags, 8);
395 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zsb), NULL,
396 &parent, 8);
397 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL,
398 &zp->z_atime, 16);
399 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zsb), NULL, &zp->z_uid, 8);
400 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zsb), NULL, &zp->z_gid, 8);
401
402 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
403 if (hdl == NULL)
404 sa_handle_destroy(zp->z_sa_hdl);
405
406 goto error;
407 }
408
409 /*
410 * xattr znodes hold a reference on their unique parent
411 */
412 if (dip && zp->z_pflags & ZFS_XATTR) {
413 igrab(dip);
414 zp->z_xattr_parent = ITOZ(dip);
415 }
416
417 ip->i_ino = obj;
418 zfs_inode_update(zp);
419 zfs_inode_set_ops(zsb, ip);
420
421 /*
422 * The only way insert_inode_locked() can fail is if the ip->i_ino
423 * number is already hashed for this super block. This can never
424 * happen because the inode numbers map 1:1 with the object numbers.
425 *
426 * The one exception is rolling back a mounted file system, but in
427 * this case all the active inode are unhashed during the rollback.
428 */
429 VERIFY3S(insert_inode_locked(ip), ==, 0);
430
431 mutex_enter(&zsb->z_znodes_lock);
432 list_insert_tail(&zsb->z_all_znodes, zp);
433 zsb->z_nr_znodes++;
434 membar_producer();
435 mutex_exit(&zsb->z_znodes_lock);
436
437 unlock_new_inode(ip);
438 return (zp);
439
440 error:
441 unlock_new_inode(ip);
442 iput(ip);
443 return NULL;
444 }
445
446 /*
447 * Update the embedded inode given the znode. We should work toward
448 * eliminating this function as soon as possible by removing values
449 * which are duplicated between the znode and inode. If the generic
450 * inode has the correct field it should be used, and the ZFS code
451 * updated to access the inode. This can be done incrementally.
452 */
453 void
454 zfs_inode_update(znode_t *zp)
455 {
456 zfs_sb_t *zsb;
457 struct inode *ip;
458 uint32_t blksize;
459 uint64_t atime[2], mtime[2], ctime[2];
460
461 ASSERT(zp != NULL);
462 zsb = ZTOZSB(zp);
463 ip = ZTOI(zp);
464
465 /* Skip .zfs control nodes which do not exist on disk. */
466 if (zfsctl_is_node(ip))
467 return;
468
469 sa_lookup(zp->z_sa_hdl, SA_ZPL_ATIME(zsb), &atime, 16);
470 sa_lookup(zp->z_sa_hdl, SA_ZPL_MTIME(zsb), &mtime, 16);
471 sa_lookup(zp->z_sa_hdl, SA_ZPL_CTIME(zsb), &ctime, 16);
472
473 spin_lock(&ip->i_lock);
474 ip->i_generation = zp->z_gen;
475 ip->i_uid = zp->z_uid;
476 ip->i_gid = zp->z_gid;
477 set_nlink(ip, zp->z_links);
478 ip->i_mode = zp->z_mode;
479 ip->i_blkbits = SPA_MINBLOCKSHIFT;
480 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize,
481 (u_longlong_t *)&ip->i_blocks);
482
483 ZFS_TIME_DECODE(&ip->i_atime, atime);
484 ZFS_TIME_DECODE(&ip->i_mtime, mtime);
485 ZFS_TIME_DECODE(&ip->i_ctime, ctime);
486
487 i_size_write(ip, zp->z_size);
488 spin_unlock(&ip->i_lock);
489 }
490
491 static uint64_t empty_xattr;
492 static uint64_t pad[4];
493 static zfs_acl_phys_t acl_phys;
494 /*
495 * Create a new DMU object to hold a zfs znode.
496 *
497 * IN: dzp - parent directory for new znode
498 * vap - file attributes for new znode
499 * tx - dmu transaction id for zap operations
500 * cr - credentials of caller
501 * flag - flags:
502 * IS_ROOT_NODE - new object will be root
503 * IS_XATTR - new object is an attribute
504 * bonuslen - length of bonus buffer
505 * setaclp - File/Dir initial ACL
506 * fuidp - Tracks fuid allocation.
507 *
508 * OUT: zpp - allocated znode
509 *
510 */
511 void
512 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
513 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
514 {
515 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
516 uint64_t mode, size, links, parent, pflags;
517 uint64_t dzp_pflags = 0;
518 uint64_t rdev = 0;
519 zfs_sb_t *zsb = ZTOZSB(dzp);
520 dmu_buf_t *db;
521 timestruc_t now;
522 uint64_t gen, obj;
523 int err;
524 int bonuslen;
525 sa_handle_t *sa_hdl;
526 dmu_object_type_t obj_type;
527 sa_bulk_attr_t *sa_attrs;
528 int cnt = 0;
529 zfs_acl_locator_cb_t locate = { 0 };
530
531 if (zsb->z_replay) {
532 obj = vap->va_nodeid;
533 now = vap->va_ctime; /* see zfs_replay_create() */
534 gen = vap->va_nblocks; /* ditto */
535 } else {
536 obj = 0;
537 gethrestime(&now);
538 gen = dmu_tx_get_txg(tx);
539 }
540
541 obj_type = zsb->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
542 bonuslen = (obj_type == DMU_OT_SA) ?
543 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
544
545 /*
546 * Create a new DMU object.
547 */
548 /*
549 * There's currently no mechanism for pre-reading the blocks that will
550 * be needed to allocate a new object, so we accept the small chance
551 * that there will be an i/o error and we will fail one of the
552 * assertions below.
553 */
554 if (S_ISDIR(vap->va_mode)) {
555 if (zsb->z_replay) {
556 err = zap_create_claim_norm(zsb->z_os, obj,
557 zsb->z_norm, DMU_OT_DIRECTORY_CONTENTS,
558 obj_type, bonuslen, tx);
559 ASSERT0(err);
560 } else {
561 obj = zap_create_norm(zsb->z_os,
562 zsb->z_norm, DMU_OT_DIRECTORY_CONTENTS,
563 obj_type, bonuslen, tx);
564 }
565 } else {
566 if (zsb->z_replay) {
567 err = dmu_object_claim(zsb->z_os, obj,
568 DMU_OT_PLAIN_FILE_CONTENTS, 0,
569 obj_type, bonuslen, tx);
570 ASSERT0(err);
571 } else {
572 obj = dmu_object_alloc(zsb->z_os,
573 DMU_OT_PLAIN_FILE_CONTENTS, 0,
574 obj_type, bonuslen, tx);
575 }
576 }
577
578 ZFS_OBJ_HOLD_ENTER(zsb, obj);
579 VERIFY(0 == sa_buf_hold(zsb->z_os, obj, NULL, &db));
580
581 /*
582 * If this is the root, fix up the half-initialized parent pointer
583 * to reference the just-allocated physical data area.
584 */
585 if (flag & IS_ROOT_NODE) {
586 dzp->z_id = obj;
587 } else {
588 dzp_pflags = dzp->z_pflags;
589 }
590
591 /*
592 * If parent is an xattr, so am I.
593 */
594 if (dzp_pflags & ZFS_XATTR) {
595 flag |= IS_XATTR;
596 }
597
598 if (zsb->z_use_fuids)
599 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
600 else
601 pflags = 0;
602
603 if (S_ISDIR(vap->va_mode)) {
604 size = 2; /* contents ("." and "..") */
605 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
606 } else {
607 size = links = 0;
608 }
609
610 if (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))
611 rdev = vap->va_rdev;
612
613 parent = dzp->z_id;
614 mode = acl_ids->z_mode;
615 if (flag & IS_XATTR)
616 pflags |= ZFS_XATTR;
617
618 /*
619 * No execs denied will be deterimed when zfs_mode_compute() is called.
620 */
621 pflags |= acl_ids->z_aclp->z_hints &
622 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
623 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
624
625 ZFS_TIME_ENCODE(&now, crtime);
626 ZFS_TIME_ENCODE(&now, ctime);
627
628 if (vap->va_mask & ATTR_ATIME) {
629 ZFS_TIME_ENCODE(&vap->va_atime, atime);
630 } else {
631 ZFS_TIME_ENCODE(&now, atime);
632 }
633
634 if (vap->va_mask & ATTR_MTIME) {
635 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
636 } else {
637 ZFS_TIME_ENCODE(&now, mtime);
638 }
639
640 /* Now add in all of the "SA" attributes */
641 VERIFY(0 == sa_handle_get_from_db(zsb->z_os, db, NULL, SA_HDL_SHARED,
642 &sa_hdl));
643
644 /*
645 * Setup the array of attributes to be replaced/set on the new file
646 *
647 * order for DMU_OT_ZNODE is critical since it needs to be constructed
648 * in the old znode_phys_t format. Don't change this ordering
649 */
650 sa_attrs = kmem_alloc(sizeof(sa_bulk_attr_t) * ZPL_END, KM_PUSHPAGE);
651
652 if (obj_type == DMU_OT_ZNODE) {
653 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zsb),
654 NULL, &atime, 16);
655 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zsb),
656 NULL, &mtime, 16);
657 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zsb),
658 NULL, &ctime, 16);
659 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zsb),
660 NULL, &crtime, 16);
661 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zsb),
662 NULL, &gen, 8);
663 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zsb),
664 NULL, &mode, 8);
665 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zsb),
666 NULL, &size, 8);
667 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zsb),
668 NULL, &parent, 8);
669 } else {
670 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zsb),
671 NULL, &mode, 8);
672 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zsb),
673 NULL, &size, 8);
674 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zsb),
675 NULL, &gen, 8);
676 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zsb),
677 NULL, &acl_ids->z_fuid, 8);
678 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zsb),
679 NULL, &acl_ids->z_fgid, 8);
680 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zsb),
681 NULL, &parent, 8);
682 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zsb),
683 NULL, &pflags, 8);
684 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zsb),
685 NULL, &atime, 16);
686 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zsb),
687 NULL, &mtime, 16);
688 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zsb),
689 NULL, &ctime, 16);
690 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zsb),
691 NULL, &crtime, 16);
692 }
693
694 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zsb), NULL, &links, 8);
695
696 if (obj_type == DMU_OT_ZNODE) {
697 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zsb), NULL,
698 &empty_xattr, 8);
699 }
700 if (obj_type == DMU_OT_ZNODE ||
701 (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))) {
702 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zsb),
703 NULL, &rdev, 8);
704 }
705 if (obj_type == DMU_OT_ZNODE) {
706 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zsb),
707 NULL, &pflags, 8);
708 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zsb), NULL,
709 &acl_ids->z_fuid, 8);
710 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zsb), NULL,
711 &acl_ids->z_fgid, 8);
712 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zsb), NULL, pad,
713 sizeof (uint64_t) * 4);
714 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zsb), NULL,
715 &acl_phys, sizeof (zfs_acl_phys_t));
716 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
717 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zsb), NULL,
718 &acl_ids->z_aclp->z_acl_count, 8);
719 locate.cb_aclp = acl_ids->z_aclp;
720 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zsb),
721 zfs_acl_data_locator, &locate,
722 acl_ids->z_aclp->z_acl_bytes);
723 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
724 acl_ids->z_fuid, acl_ids->z_fgid);
725 }
726
727 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
728
729 if (!(flag & IS_ROOT_NODE)) {
730 *zpp = zfs_znode_alloc(zsb, db, 0, obj_type, obj, sa_hdl,
731 ZTOI(dzp));
732 VERIFY(*zpp != NULL);
733 VERIFY(dzp != NULL);
734 } else {
735 /*
736 * If we are creating the root node, the "parent" we
737 * passed in is the znode for the root.
738 */
739 *zpp = dzp;
740
741 (*zpp)->z_sa_hdl = sa_hdl;
742 }
743
744 (*zpp)->z_pflags = pflags;
745 (*zpp)->z_mode = mode;
746
747 if (obj_type == DMU_OT_ZNODE ||
748 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
749 err = zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx);
750 ASSERT0(err);
751 }
752 kmem_free(sa_attrs, sizeof(sa_bulk_attr_t) * ZPL_END);
753 ZFS_OBJ_HOLD_EXIT(zsb, obj);
754 }
755
756 /*
757 * zfs_xvattr_set only updates the in-core attributes
758 * it is assumed the caller will be doing an sa_bulk_update
759 * to push the changes out
760 */
761 void
762 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
763 {
764 xoptattr_t *xoap;
765
766 xoap = xva_getxoptattr(xvap);
767 ASSERT(xoap);
768
769 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
770 uint64_t times[2];
771 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
772 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
773 &times, sizeof (times), tx);
774 XVA_SET_RTN(xvap, XAT_CREATETIME);
775 }
776 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
777 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
778 zp->z_pflags, tx);
779 XVA_SET_RTN(xvap, XAT_READONLY);
780 }
781 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
782 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
783 zp->z_pflags, tx);
784 XVA_SET_RTN(xvap, XAT_HIDDEN);
785 }
786 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
787 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
788 zp->z_pflags, tx);
789 XVA_SET_RTN(xvap, XAT_SYSTEM);
790 }
791 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
792 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
793 zp->z_pflags, tx);
794 XVA_SET_RTN(xvap, XAT_ARCHIVE);
795 }
796 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
797 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
798 zp->z_pflags, tx);
799 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
800 }
801 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
802 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
803 zp->z_pflags, tx);
804 XVA_SET_RTN(xvap, XAT_NOUNLINK);
805 }
806 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
807 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
808 zp->z_pflags, tx);
809 XVA_SET_RTN(xvap, XAT_APPENDONLY);
810 }
811 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
812 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
813 zp->z_pflags, tx);
814 XVA_SET_RTN(xvap, XAT_NODUMP);
815 }
816 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
817 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
818 zp->z_pflags, tx);
819 XVA_SET_RTN(xvap, XAT_OPAQUE);
820 }
821 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
822 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
823 xoap->xoa_av_quarantined, zp->z_pflags, tx);
824 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
825 }
826 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
827 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
828 zp->z_pflags, tx);
829 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
830 }
831 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
832 zfs_sa_set_scanstamp(zp, xvap, tx);
833 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
834 }
835 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
836 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
837 zp->z_pflags, tx);
838 XVA_SET_RTN(xvap, XAT_REPARSE);
839 }
840 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
841 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
842 zp->z_pflags, tx);
843 XVA_SET_RTN(xvap, XAT_OFFLINE);
844 }
845 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
846 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
847 zp->z_pflags, tx);
848 XVA_SET_RTN(xvap, XAT_SPARSE);
849 }
850 }
851
852 int
853 zfs_zget(zfs_sb_t *zsb, uint64_t obj_num, znode_t **zpp)
854 {
855 dmu_object_info_t doi;
856 dmu_buf_t *db;
857 znode_t *zp;
858 int err;
859 sa_handle_t *hdl;
860 struct inode *ip;
861
862 *zpp = NULL;
863
864 again:
865 ip = ilookup(zsb->z_sb, obj_num);
866
867 ZFS_OBJ_HOLD_ENTER(zsb, obj_num);
868
869 err = sa_buf_hold(zsb->z_os, obj_num, NULL, &db);
870 if (err) {
871 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
872 iput(ip);
873 return (err);
874 }
875
876 dmu_object_info_from_db(db, &doi);
877 if (doi.doi_bonus_type != DMU_OT_SA &&
878 (doi.doi_bonus_type != DMU_OT_ZNODE ||
879 (doi.doi_bonus_type == DMU_OT_ZNODE &&
880 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
881 sa_buf_rele(db, NULL);
882 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
883 iput(ip);
884 return (EINVAL);
885 }
886
887 hdl = dmu_buf_get_user(db);
888 if (hdl != NULL) {
889 if (ip == NULL) {
890 /*
891 * ilookup returned NULL, which means
892 * the znode is dying - but the SA handle isn't
893 * quite dead yet, we need to drop any locks
894 * we're holding, re-schedule the task and try again.
895 */
896 sa_buf_rele(db, NULL);
897 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
898
899 schedule();
900 goto again;
901 }
902
903 zp = sa_get_userdata(hdl);
904
905 /*
906 * Since "SA" does immediate eviction we
907 * should never find a sa handle that doesn't
908 * know about the znode.
909 */
910
911 ASSERT3P(zp, !=, NULL);
912
913 mutex_enter(&zp->z_lock);
914 ASSERT3U(zp->z_id, ==, obj_num);
915 if (zp->z_unlinked) {
916 err = ENOENT;
917 } else {
918 igrab(ZTOI(zp));
919 *zpp = zp;
920 err = 0;
921 }
922 sa_buf_rele(db, NULL);
923 mutex_exit(&zp->z_lock);
924 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
925 iput(ip);
926 return (err);
927 }
928
929 ASSERT3P(ip, ==, NULL);
930
931 /*
932 * Not found create new znode/vnode but only if file exists.
933 *
934 * There is a small window where zfs_vget() could
935 * find this object while a file create is still in
936 * progress. This is checked for in zfs_znode_alloc()
937 *
938 * if zfs_znode_alloc() fails it will drop the hold on the
939 * bonus buffer.
940 */
941 zp = zfs_znode_alloc(zsb, db, doi.doi_data_block_size,
942 doi.doi_bonus_type, obj_num, NULL, NULL);
943 if (zp == NULL) {
944 err = ENOENT;
945 } else {
946 *zpp = zp;
947 }
948 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
949 return (err);
950 }
951
952 int
953 zfs_rezget(znode_t *zp)
954 {
955 zfs_sb_t *zsb = ZTOZSB(zp);
956 dmu_object_info_t doi;
957 dmu_buf_t *db;
958 uint64_t obj_num = zp->z_id;
959 uint64_t mode;
960 sa_bulk_attr_t bulk[8];
961 int err;
962 int count = 0;
963 uint64_t gen;
964
965 ZFS_OBJ_HOLD_ENTER(zsb, obj_num);
966
967 mutex_enter(&zp->z_acl_lock);
968 if (zp->z_acl_cached) {
969 zfs_acl_free(zp->z_acl_cached);
970 zp->z_acl_cached = NULL;
971 }
972 mutex_exit(&zp->z_acl_lock);
973
974 rw_enter(&zp->z_xattr_lock, RW_WRITER);
975 if (zp->z_xattr_cached) {
976 nvlist_free(zp->z_xattr_cached);
977 zp->z_xattr_cached = NULL;
978 }
979
980 if (zp->z_xattr_parent) {
981 iput(ZTOI(zp->z_xattr_parent));
982 zp->z_xattr_parent = NULL;
983 }
984 rw_exit(&zp->z_xattr_lock);
985
986 ASSERT(zp->z_sa_hdl == NULL);
987 err = sa_buf_hold(zsb->z_os, obj_num, NULL, &db);
988 if (err) {
989 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
990 return (err);
991 }
992
993 dmu_object_info_from_db(db, &doi);
994 if (doi.doi_bonus_type != DMU_OT_SA &&
995 (doi.doi_bonus_type != DMU_OT_ZNODE ||
996 (doi.doi_bonus_type == DMU_OT_ZNODE &&
997 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
998 sa_buf_rele(db, NULL);
999 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
1000 return (EINVAL);
1001 }
1002
1003 zfs_znode_sa_init(zsb, zp, db, doi.doi_bonus_type, NULL);
1004
1005 /* reload cached values */
1006 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zsb), NULL,
1007 &gen, sizeof (gen));
1008 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb), NULL,
1009 &zp->z_size, sizeof (zp->z_size));
1010 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb), NULL,
1011 &zp->z_links, sizeof (zp->z_links));
1012 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
1013 &zp->z_pflags, sizeof (zp->z_pflags));
1014 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL,
1015 &zp->z_atime, sizeof (zp->z_atime));
1016 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zsb), NULL,
1017 &zp->z_uid, sizeof (zp->z_uid));
1018 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zsb), NULL,
1019 &zp->z_gid, sizeof (zp->z_gid));
1020 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL,
1021 &mode, sizeof (mode));
1022
1023 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1024 zfs_znode_dmu_fini(zp);
1025 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
1026 return (EIO);
1027 }
1028
1029 zp->z_mode = mode;
1030
1031 if (gen != zp->z_gen) {
1032 zfs_znode_dmu_fini(zp);
1033 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
1034 return (EIO);
1035 }
1036
1037 zp->z_unlinked = (zp->z_links == 0);
1038 zp->z_blksz = doi.doi_data_block_size;
1039 zfs_inode_update(zp);
1040
1041 ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
1042
1043 return (0);
1044 }
1045
1046 void
1047 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1048 {
1049 zfs_sb_t *zsb = ZTOZSB(zp);
1050 objset_t *os = zsb->z_os;
1051 uint64_t obj = zp->z_id;
1052 uint64_t acl_obj = zfs_external_acl(zp);
1053
1054 ZFS_OBJ_HOLD_ENTER(zsb, obj);
1055 if (acl_obj) {
1056 VERIFY(!zp->z_is_sa);
1057 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1058 }
1059 VERIFY(0 == dmu_object_free(os, obj, tx));
1060 zfs_znode_dmu_fini(zp);
1061 ZFS_OBJ_HOLD_EXIT(zsb, obj);
1062 }
1063
1064 void
1065 zfs_zinactive(znode_t *zp)
1066 {
1067 zfs_sb_t *zsb = ZTOZSB(zp);
1068 uint64_t z_id = zp->z_id;
1069 boolean_t drop_mutex = 0;
1070
1071 ASSERT(zp->z_sa_hdl);
1072
1073 /*
1074 * Don't allow a zfs_zget() while were trying to release this znode.
1075 *
1076 * Linux allows direct memory reclaim which means that any KM_SLEEP
1077 * allocation may trigger inode eviction. This can lead to a deadlock
1078 * through the ->shrink_icache_memory()->evict()->zfs_inactive()->
1079 * zfs_zinactive() call path. To avoid this deadlock the process
1080 * must not reacquire the mutex when it is already holding it.
1081 */
1082 if (!ZFS_OBJ_HOLD_OWNED(zsb, z_id)) {
1083 ZFS_OBJ_HOLD_ENTER(zsb, z_id);
1084 drop_mutex = 1;
1085 }
1086
1087 mutex_enter(&zp->z_lock);
1088
1089 /*
1090 * If this was the last reference to a file with no links,
1091 * remove the file from the file system.
1092 */
1093 if (zp->z_unlinked) {
1094 mutex_exit(&zp->z_lock);
1095
1096 if (drop_mutex)
1097 ZFS_OBJ_HOLD_EXIT(zsb, z_id);
1098
1099 zfs_rmnode(zp);
1100 return;
1101 }
1102
1103 mutex_exit(&zp->z_lock);
1104 zfs_znode_dmu_fini(zp);
1105
1106 if (drop_mutex)
1107 ZFS_OBJ_HOLD_EXIT(zsb, z_id);
1108 }
1109
1110 void
1111 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1112 uint64_t ctime[2], boolean_t have_tx)
1113 {
1114 timestruc_t now;
1115
1116 gethrestime(&now);
1117
1118 if (have_tx) { /* will sa_bulk_update happen really soon? */
1119 zp->z_atime_dirty = 0;
1120 zp->z_seq++;
1121 } else {
1122 zp->z_atime_dirty = 1;
1123 }
1124
1125 if (flag & ATTR_ATIME) {
1126 ZFS_TIME_ENCODE(&now, zp->z_atime);
1127 }
1128
1129 if (flag & ATTR_MTIME) {
1130 ZFS_TIME_ENCODE(&now, mtime);
1131 if (ZTOZSB(zp)->z_use_fuids) {
1132 zp->z_pflags |= (ZFS_ARCHIVE |
1133 ZFS_AV_MODIFIED);
1134 }
1135 }
1136
1137 if (flag & ATTR_CTIME) {
1138 ZFS_TIME_ENCODE(&now, ctime);
1139 if (ZTOZSB(zp)->z_use_fuids)
1140 zp->z_pflags |= ZFS_ARCHIVE;
1141 }
1142 }
1143
1144 /*
1145 * Grow the block size for a file.
1146 *
1147 * IN: zp - znode of file to free data in.
1148 * size - requested block size
1149 * tx - open transaction.
1150 *
1151 * NOTE: this function assumes that the znode is write locked.
1152 */
1153 void
1154 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1155 {
1156 int error;
1157 u_longlong_t dummy;
1158
1159 if (size <= zp->z_blksz)
1160 return;
1161 /*
1162 * If the file size is already greater than the current blocksize,
1163 * we will not grow. If there is more than one block in a file,
1164 * the blocksize cannot change.
1165 */
1166 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1167 return;
1168
1169 error = dmu_object_set_blocksize(ZTOZSB(zp)->z_os, zp->z_id,
1170 size, 0, tx);
1171
1172 if (error == ENOTSUP)
1173 return;
1174 ASSERT0(error);
1175
1176 /* What blocksize did we actually get? */
1177 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1178 }
1179
1180 /*
1181 * Increase the file length
1182 *
1183 * IN: zp - znode of file to free data in.
1184 * end - new end-of-file
1185 *
1186 * RETURN: 0 if success
1187 * error code if failure
1188 */
1189 static int
1190 zfs_extend(znode_t *zp, uint64_t end)
1191 {
1192 zfs_sb_t *zsb = ZTOZSB(zp);
1193 dmu_tx_t *tx;
1194 rl_t *rl;
1195 uint64_t newblksz;
1196 int error;
1197
1198 /*
1199 * We will change zp_size, lock the whole file.
1200 */
1201 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1202
1203 /*
1204 * Nothing to do if file already at desired length.
1205 */
1206 if (end <= zp->z_size) {
1207 zfs_range_unlock(rl);
1208 return (0);
1209 }
1210 top:
1211 tx = dmu_tx_create(zsb->z_os);
1212 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1213 zfs_sa_upgrade_txholds(tx, zp);
1214 if (end > zp->z_blksz &&
1215 (!ISP2(zp->z_blksz) || zp->z_blksz < zsb->z_max_blksz)) {
1216 /*
1217 * We are growing the file past the current block size.
1218 */
1219 if (zp->z_blksz > ZTOZSB(zp)->z_max_blksz) {
1220 ASSERT(!ISP2(zp->z_blksz));
1221 newblksz = MIN(end, SPA_MAXBLOCKSIZE);
1222 } else {
1223 newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz);
1224 }
1225 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1226 } else {
1227 newblksz = 0;
1228 }
1229
1230 error = dmu_tx_assign(tx, TXG_NOWAIT);
1231 if (error) {
1232 if (error == ERESTART) {
1233 dmu_tx_wait(tx);
1234 dmu_tx_abort(tx);
1235 goto top;
1236 }
1237 dmu_tx_abort(tx);
1238 zfs_range_unlock(rl);
1239 return (error);
1240 }
1241
1242 if (newblksz)
1243 zfs_grow_blocksize(zp, newblksz, tx);
1244
1245 zp->z_size = end;
1246
1247 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)),
1248 &zp->z_size, sizeof (zp->z_size), tx));
1249
1250 zfs_range_unlock(rl);
1251
1252 dmu_tx_commit(tx);
1253
1254 return (0);
1255 }
1256
1257 /*
1258 * Free space in a file.
1259 *
1260 * IN: zp - znode of file to free data in.
1261 * off - start of section to free.
1262 * len - length of section to free.
1263 *
1264 * RETURN: 0 if success
1265 * error code if failure
1266 */
1267 static int
1268 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1269 {
1270 zfs_sb_t *zsb = ZTOZSB(zp);
1271 rl_t *rl;
1272 int error;
1273
1274 /*
1275 * Lock the range being freed.
1276 */
1277 rl = zfs_range_lock(zp, off, len, RL_WRITER);
1278
1279 /*
1280 * Nothing to do if file already at desired length.
1281 */
1282 if (off >= zp->z_size) {
1283 zfs_range_unlock(rl);
1284 return (0);
1285 }
1286
1287 if (off + len > zp->z_size)
1288 len = zp->z_size - off;
1289
1290 error = dmu_free_long_range(zsb->z_os, zp->z_id, off, len);
1291
1292 zfs_range_unlock(rl);
1293
1294 return (error);
1295 }
1296
1297 /*
1298 * Truncate a file
1299 *
1300 * IN: zp - znode of file to free data in.
1301 * end - new end-of-file.
1302 *
1303 * RETURN: 0 if success
1304 * error code if failure
1305 */
1306 static int
1307 zfs_trunc(znode_t *zp, uint64_t end)
1308 {
1309 zfs_sb_t *zsb = ZTOZSB(zp);
1310 dmu_tx_t *tx;
1311 rl_t *rl;
1312 int error;
1313 sa_bulk_attr_t bulk[2];
1314 int count = 0;
1315
1316 /*
1317 * We will change zp_size, lock the whole file.
1318 */
1319 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
1320
1321 /*
1322 * Nothing to do if file already at desired length.
1323 */
1324 if (end >= zp->z_size) {
1325 zfs_range_unlock(rl);
1326 return (0);
1327 }
1328
1329 error = dmu_free_long_range(zsb->z_os, zp->z_id, end, -1);
1330 if (error) {
1331 zfs_range_unlock(rl);
1332 return (error);
1333 }
1334 top:
1335 tx = dmu_tx_create(zsb->z_os);
1336 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1337 zfs_sa_upgrade_txholds(tx, zp);
1338 error = dmu_tx_assign(tx, TXG_NOWAIT);
1339 if (error) {
1340 if (error == ERESTART) {
1341 dmu_tx_wait(tx);
1342 dmu_tx_abort(tx);
1343 goto top;
1344 }
1345 dmu_tx_abort(tx);
1346 zfs_range_unlock(rl);
1347 return (error);
1348 }
1349
1350 zp->z_size = end;
1351 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb),
1352 NULL, &zp->z_size, sizeof (zp->z_size));
1353
1354 if (end == 0) {
1355 zp->z_pflags &= ~ZFS_SPARSE;
1356 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb),
1357 NULL, &zp->z_pflags, 8);
1358 }
1359 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1360
1361 dmu_tx_commit(tx);
1362
1363 zfs_range_unlock(rl);
1364
1365 return (0);
1366 }
1367
1368 /*
1369 * Free space in a file
1370 *
1371 * IN: zp - znode of file to free data in.
1372 * off - start of range
1373 * len - end of range (0 => EOF)
1374 * flag - current file open mode flags.
1375 * log - TRUE if this action should be logged
1376 *
1377 * RETURN: 0 if success
1378 * error code if failure
1379 */
1380 int
1381 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1382 {
1383 struct inode *ip = ZTOI(zp);
1384 dmu_tx_t *tx;
1385 zfs_sb_t *zsb = ZTOZSB(zp);
1386 zilog_t *zilog = zsb->z_log;
1387 uint64_t mode;
1388 uint64_t mtime[2], ctime[2];
1389 sa_bulk_attr_t bulk[3];
1390 int count = 0;
1391 int error;
1392
1393 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zsb), &mode,
1394 sizeof (mode))) != 0)
1395 return (error);
1396
1397 if (off > zp->z_size) {
1398 error = zfs_extend(zp, off+len);
1399 if (error == 0 && log)
1400 goto log;
1401 else
1402 return (error);
1403 }
1404
1405 /*
1406 * Check for any locks in the region to be freed.
1407 */
1408 if (ip->i_flock && mandatory_lock(ip)) {
1409 uint64_t length = (len ? len : zp->z_size - off);
1410 if (!lock_may_write(ip, off, length))
1411 return (EAGAIN);
1412 }
1413
1414 if (len == 0) {
1415 error = zfs_trunc(zp, off);
1416 } else {
1417 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1418 off + len > zp->z_size)
1419 error = zfs_extend(zp, off+len);
1420 }
1421 if (error || !log)
1422 return (error);
1423 log:
1424 tx = dmu_tx_create(zsb->z_os);
1425 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1426 zfs_sa_upgrade_txholds(tx, zp);
1427 error = dmu_tx_assign(tx, TXG_NOWAIT);
1428 if (error) {
1429 if (error == ERESTART) {
1430 dmu_tx_wait(tx);
1431 dmu_tx_abort(tx);
1432 goto log;
1433 }
1434 dmu_tx_abort(tx);
1435 return (error);
1436 }
1437
1438 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, mtime, 16);
1439 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, ctime, 16);
1440 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb),
1441 NULL, &zp->z_pflags, 8);
1442 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
1443 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1444 ASSERT(error == 0);
1445
1446 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1447
1448 dmu_tx_commit(tx);
1449 zfs_inode_update(zp);
1450 return (0);
1451 }
1452
1453 void
1454 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1455 {
1456 struct super_block *sb;
1457 zfs_sb_t *zsb;
1458 uint64_t moid, obj, sa_obj, version;
1459 uint64_t sense = ZFS_CASE_SENSITIVE;
1460 uint64_t norm = 0;
1461 nvpair_t *elem;
1462 int error;
1463 int i;
1464 znode_t *rootzp = NULL;
1465 vattr_t vattr;
1466 znode_t *zp;
1467 zfs_acl_ids_t acl_ids;
1468
1469 /*
1470 * First attempt to create master node.
1471 */
1472 /*
1473 * In an empty objset, there are no blocks to read and thus
1474 * there can be no i/o errors (which we assert below).
1475 */
1476 moid = MASTER_NODE_OBJ;
1477 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1478 DMU_OT_NONE, 0, tx);
1479 ASSERT(error == 0);
1480
1481 /*
1482 * Set starting attributes.
1483 */
1484 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1485 elem = NULL;
1486 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1487 /* For the moment we expect all zpl props to be uint64_ts */
1488 uint64_t val;
1489 char *name;
1490
1491 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1492 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1493 name = nvpair_name(elem);
1494 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1495 if (val < version)
1496 version = val;
1497 } else {
1498 error = zap_update(os, moid, name, 8, 1, &val, tx);
1499 }
1500 ASSERT(error == 0);
1501 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1502 norm = val;
1503 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1504 sense = val;
1505 }
1506 ASSERT(version != 0);
1507 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1508
1509 /*
1510 * Create zap object used for SA attribute registration
1511 */
1512
1513 if (version >= ZPL_VERSION_SA) {
1514 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1515 DMU_OT_NONE, 0, tx);
1516 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1517 ASSERT(error == 0);
1518 } else {
1519 sa_obj = 0;
1520 }
1521 /*
1522 * Create a delete queue.
1523 */
1524 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1525
1526 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1527 ASSERT(error == 0);
1528
1529 /*
1530 * Create root znode. Create minimal znode/inode/zsb/sb
1531 * to allow zfs_mknode to work.
1532 */
1533 vattr.va_mask = ATTR_MODE|ATTR_UID|ATTR_GID;
1534 vattr.va_mode = S_IFDIR|0755;
1535 vattr.va_uid = crgetuid(cr);
1536 vattr.va_gid = crgetgid(cr);
1537
1538 rootzp = kmem_cache_alloc(znode_cache, KM_PUSHPAGE);
1539 rootzp->z_moved = 0;
1540 rootzp->z_unlinked = 0;
1541 rootzp->z_atime_dirty = 0;
1542 rootzp->z_is_sa = USE_SA(version, os);
1543
1544 zsb = kmem_zalloc(sizeof (zfs_sb_t), KM_PUSHPAGE | KM_NODEBUG);
1545 zsb->z_os = os;
1546 zsb->z_parent = zsb;
1547 zsb->z_version = version;
1548 zsb->z_use_fuids = USE_FUIDS(version, os);
1549 zsb->z_use_sa = USE_SA(version, os);
1550 zsb->z_norm = norm;
1551
1552 sb = kmem_zalloc(sizeof (struct super_block), KM_PUSHPAGE);
1553 sb->s_fs_info = zsb;
1554
1555 ZTOI(rootzp)->i_sb = sb;
1556
1557 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1558 &zsb->z_attr_table);
1559
1560 ASSERT(error == 0);
1561
1562 /*
1563 * Fold case on file systems that are always or sometimes case
1564 * insensitive.
1565 */
1566 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1567 zsb->z_norm |= U8_TEXTPREP_TOUPPER;
1568
1569 mutex_init(&zsb->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1570 list_create(&zsb->z_all_znodes, sizeof (znode_t),
1571 offsetof(znode_t, z_link_node));
1572
1573 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1574 mutex_init(&zsb->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1575
1576 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1577 cr, NULL, &acl_ids));
1578 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1579 ASSERT3P(zp, ==, rootzp);
1580 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1581 ASSERT(error == 0);
1582 zfs_acl_ids_free(&acl_ids);
1583
1584 atomic_set(&ZTOI(rootzp)->i_count, 0);
1585 sa_handle_destroy(rootzp->z_sa_hdl);
1586 kmem_cache_free(znode_cache, rootzp);
1587
1588 /*
1589 * Create shares directory
1590 */
1591 error = zfs_create_share_dir(zsb, tx);
1592 ASSERT(error == 0);
1593
1594 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1595 mutex_destroy(&zsb->z_hold_mtx[i]);
1596
1597 kmem_free(sb, sizeof (struct super_block));
1598 kmem_free(zsb, sizeof (zfs_sb_t));
1599 }
1600 #endif /* _KERNEL */
1601
1602 static int
1603 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1604 {
1605 uint64_t sa_obj = 0;
1606 int error;
1607
1608 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1609 if (error != 0 && error != ENOENT)
1610 return (error);
1611
1612 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1613 return (error);
1614 }
1615
1616 static int
1617 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
1618 dmu_buf_t **db, void *tag)
1619 {
1620 dmu_object_info_t doi;
1621 int error;
1622
1623 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
1624 return (error);
1625
1626 dmu_object_info_from_db(*db, &doi);
1627 if ((doi.doi_bonus_type != DMU_OT_SA &&
1628 doi.doi_bonus_type != DMU_OT_ZNODE) ||
1629 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1630 doi.doi_bonus_size < sizeof (znode_phys_t))) {
1631 sa_buf_rele(*db, tag);
1632 return (ENOTSUP);
1633 }
1634
1635 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
1636 if (error != 0) {
1637 sa_buf_rele(*db, tag);
1638 return (error);
1639 }
1640
1641 return (0);
1642 }
1643
1644 void
1645 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
1646 {
1647 sa_handle_destroy(hdl);
1648 sa_buf_rele(db, tag);
1649 }
1650
1651 /*
1652 * Given an object number, return its parent object number and whether
1653 * or not the object is an extended attribute directory.
1654 */
1655 static int
1656 zfs_obj_to_pobj(sa_handle_t *hdl, sa_attr_type_t *sa_table, uint64_t *pobjp,
1657 int *is_xattrdir)
1658 {
1659 uint64_t parent;
1660 uint64_t pflags;
1661 uint64_t mode;
1662 sa_bulk_attr_t bulk[3];
1663 int count = 0;
1664 int error;
1665
1666 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
1667 &parent, sizeof (parent));
1668 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
1669 &pflags, sizeof (pflags));
1670 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
1671 &mode, sizeof (mode));
1672
1673 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
1674 return (error);
1675
1676 *pobjp = parent;
1677 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
1678
1679 return (0);
1680 }
1681
1682 /*
1683 * Given an object number, return some zpl level statistics
1684 */
1685 static int
1686 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
1687 zfs_stat_t *sb)
1688 {
1689 sa_bulk_attr_t bulk[4];
1690 int count = 0;
1691
1692 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
1693 &sb->zs_mode, sizeof (sb->zs_mode));
1694 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
1695 &sb->zs_gen, sizeof (sb->zs_gen));
1696 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
1697 &sb->zs_links, sizeof (sb->zs_links));
1698 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
1699 &sb->zs_ctime, sizeof (sb->zs_ctime));
1700
1701 return (sa_bulk_lookup(hdl, bulk, count));
1702 }
1703
1704 static int
1705 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
1706 sa_attr_type_t *sa_table, char *buf, int len)
1707 {
1708 sa_handle_t *sa_hdl;
1709 sa_handle_t *prevhdl = NULL;
1710 dmu_buf_t *prevdb = NULL;
1711 dmu_buf_t *sa_db = NULL;
1712 char *path = buf + len - 1;
1713 int error;
1714
1715 *path = '\0';
1716 sa_hdl = hdl;
1717
1718 for (;;) {
1719 uint64_t pobj;
1720 char component[MAXNAMELEN + 2];
1721 size_t complen;
1722 int is_xattrdir;
1723
1724 if (prevdb)
1725 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
1726
1727 if ((error = zfs_obj_to_pobj(sa_hdl, sa_table, &pobj,
1728 &is_xattrdir)) != 0)
1729 break;
1730
1731 if (pobj == obj) {
1732 if (path[0] != '/')
1733 *--path = '/';
1734 break;
1735 }
1736
1737 component[0] = '/';
1738 if (is_xattrdir) {
1739 (void) sprintf(component + 1, "<xattrdir>");
1740 } else {
1741 error = zap_value_search(osp, pobj, obj,
1742 ZFS_DIRENT_OBJ(-1ULL), component + 1);
1743 if (error != 0)
1744 break;
1745 }
1746
1747 complen = strlen(component);
1748 path -= complen;
1749 ASSERT(path >= buf);
1750 bcopy(component, path, complen);
1751 obj = pobj;
1752
1753 if (sa_hdl != hdl) {
1754 prevhdl = sa_hdl;
1755 prevdb = sa_db;
1756 }
1757 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
1758 if (error != 0) {
1759 sa_hdl = prevhdl;
1760 sa_db = prevdb;
1761 break;
1762 }
1763 }
1764
1765 if (sa_hdl != NULL && sa_hdl != hdl) {
1766 ASSERT(sa_db != NULL);
1767 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
1768 }
1769
1770 if (error == 0)
1771 (void) memmove(buf, path, buf + len - path);
1772
1773 return (error);
1774 }
1775
1776 int
1777 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
1778 {
1779 sa_attr_type_t *sa_table;
1780 sa_handle_t *hdl;
1781 dmu_buf_t *db;
1782 int error;
1783
1784 error = zfs_sa_setup(osp, &sa_table);
1785 if (error != 0)
1786 return (error);
1787
1788 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
1789 if (error != 0)
1790 return (error);
1791
1792 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
1793
1794 zfs_release_sa_handle(hdl, db, FTAG);
1795 return (error);
1796 }
1797
1798 int
1799 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
1800 char *buf, int len)
1801 {
1802 char *path = buf + len - 1;
1803 sa_attr_type_t *sa_table;
1804 sa_handle_t *hdl;
1805 dmu_buf_t *db;
1806 int error;
1807
1808 *path = '\0';
1809
1810 error = zfs_sa_setup(osp, &sa_table);
1811 if (error != 0)
1812 return (error);
1813
1814 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
1815 if (error != 0)
1816 return (error);
1817
1818 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
1819 if (error != 0) {
1820 zfs_release_sa_handle(hdl, db, FTAG);
1821 return (error);
1822 }
1823
1824 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
1825
1826 zfs_release_sa_handle(hdl, db, FTAG);
1827 return (error);
1828 }
1829
1830 #if defined(_KERNEL) && defined(HAVE_SPL)
1831 EXPORT_SYMBOL(zfs_create_fs);
1832 EXPORT_SYMBOL(zfs_obj_to_path);
1833 #endif
ZFS On Linux mirror for PVE