?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Handle possible null pointers from malloc/strdup/strndup()
[zfs.git] / module / os / linux / zfs / zfs_znode.c
blob73c21b6c00a8cfd02385546c8d09772ba9998216
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 https://opensource.org/licenses/CDDL-1.0.
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, 2018 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/sysmacros.h>
33 #include <sys/mntent.h>
34 #include <sys/u8_textprep.h>
35 #include <sys/dsl_dataset.h>
36 #include <sys/vfs.h>
37 #include <sys/vnode.h>
38 #include <sys/file.h>
39 #include <sys/kmem.h>
40 #include <sys/errno.h>
41 #include <sys/atomic.h>
42 #include <sys/zfs_dir.h>
43 #include <sys/zfs_acl.h>
44 #include <sys/zfs_ioctl.h>
45 #include <sys/zfs_rlock.h>
46 #include <sys/zfs_fuid.h>
47 #include <sys/zfs_vnops.h>
48 #include <sys/zfs_ctldir.h>
49 #include <sys/dnode.h>
50 #include <sys/fs/zfs.h>
51 #include <sys/zpl.h>
52 #endif /* _KERNEL */
53
54 #include <sys/dmu.h>
55 #include <sys/dmu_objset.h>
56 #include <sys/dmu_tx.h>
57 #include <sys/zfs_refcount.h>
58 #include <sys/stat.h>
59 #include <sys/zap.h>
60 #include <sys/zfs_znode.h>
61 #include <sys/sa.h>
62 #include <sys/zfs_sa.h>
63 #include <sys/zfs_stat.h>
64
65 #include "zfs_prop.h"
66 #include "zfs_comutil.h"
67
68 /*
69 * Functions needed for userland (ie: libzpool) are not put under
70 * #ifdef_KERNEL; the rest of the functions have dependencies
71 * (such as VFS logic) that will not compile easily in userland.
72 */
73 #ifdef _KERNEL
74
75 static kmem_cache_t *znode_cache = NULL;
76 static kmem_cache_t *znode_hold_cache = NULL;
77 unsigned int zfs_object_mutex_size = ZFS_OBJ_MTX_SZ;
78
79 /*
80 * This is used by the test suite so that it can delay znodes from being
81 * freed in order to inspect the unlinked set.
82 */
83 static int zfs_unlink_suspend_progress = 0;
84
85 /*
86 * This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on
87 * z_rangelock. It will modify the offset and length of the lock to reflect
88 * znode-specific information, and convert RL_APPEND to RL_WRITER. This is
89 * called with the rangelock_t's rl_lock held, which avoids races.
90 */
91 static void
92 zfs_rangelock_cb(zfs_locked_range_t *new, void *arg)
93 {
94 znode_t *zp = arg;
95
96 /*
97 * If in append mode, convert to writer and lock starting at the
98 * current end of file.
99 */
100 if (new->lr_type == RL_APPEND) {
101 new->lr_offset = zp->z_size;
102 new->lr_type = RL_WRITER;
103 }
104
105 /*
106 * If we need to grow the block size then lock the whole file range.
107 */
108 uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length);
109 if (end_size > zp->z_blksz && (!ISP2(zp->z_blksz) ||
110 zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) {
111 new->lr_offset = 0;
112 new->lr_length = UINT64_MAX;
113 }
114 }
115
116 static int
117 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
118 {
119 (void) arg, (void) kmflags;
120 znode_t *zp = buf;
121
122 inode_init_once(ZTOI(zp));
123 list_link_init(&zp->z_link_node);
124
125 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
126 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
127 rw_init(&zp->z_name_lock, NULL, RW_NOLOCKDEP, NULL);
128 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
129 rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);
130
131 zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp);
132
133 zp->z_dirlocks = NULL;
134 zp->z_acl_cached = NULL;
135 zp->z_xattr_cached = NULL;
136 zp->z_xattr_parent = 0;
137 zp->z_sync_writes_cnt = 0;
138 zp->z_async_writes_cnt = 0;
139
140 return (0);
141 }
142
143 static void
144 zfs_znode_cache_destructor(void *buf, void *arg)
145 {
146 (void) arg;
147 znode_t *zp = buf;
148
149 ASSERT(!list_link_active(&zp->z_link_node));
150 mutex_destroy(&zp->z_lock);
151 rw_destroy(&zp->z_parent_lock);
152 rw_destroy(&zp->z_name_lock);
153 mutex_destroy(&zp->z_acl_lock);
154 rw_destroy(&zp->z_xattr_lock);
155 zfs_rangelock_fini(&zp->z_rangelock);
156
157 ASSERT3P(zp->z_dirlocks, ==, NULL);
158 ASSERT3P(zp->z_acl_cached, ==, NULL);
159 ASSERT3P(zp->z_xattr_cached, ==, NULL);
160
161 ASSERT0(atomic_load_32(&zp->z_sync_writes_cnt));
162 ASSERT0(atomic_load_32(&zp->z_async_writes_cnt));
163 }
164
165 static int
166 zfs_znode_hold_cache_constructor(void *buf, void *arg, int kmflags)
167 {
168 (void) arg, (void) kmflags;
169 znode_hold_t *zh = buf;
170
171 mutex_init(&zh->zh_lock, NULL, MUTEX_DEFAULT, NULL);
172 zfs_refcount_create(&zh->zh_refcount);
173 zh->zh_obj = ZFS_NO_OBJECT;
174
175 return (0);
176 }
177
178 static void
179 zfs_znode_hold_cache_destructor(void *buf, void *arg)
180 {
181 (void) arg;
182 znode_hold_t *zh = buf;
183
184 mutex_destroy(&zh->zh_lock);
185 zfs_refcount_destroy(&zh->zh_refcount);
186 }
187
188 void
189 zfs_znode_init(void)
190 {
191 /*
192 * Initialize zcache. The KMC_SLAB hint is used in order that it be
193 * backed by kmalloc() when on the Linux slab in order that any
194 * wait_on_bit() operations on the related inode operate properly.
195 */
196 ASSERT(znode_cache == NULL);
197 znode_cache = kmem_cache_create("zfs_znode_cache",
198 sizeof (znode_t), 0, zfs_znode_cache_constructor,
199 zfs_znode_cache_destructor, NULL, NULL, NULL, KMC_SLAB);
200
201 ASSERT(znode_hold_cache == NULL);
202 znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache",
203 sizeof (znode_hold_t), 0, zfs_znode_hold_cache_constructor,
204 zfs_znode_hold_cache_destructor, NULL, NULL, NULL, 0);
205 }
206
207 void
208 zfs_znode_fini(void)
209 {
210 /*
211 * Cleanup zcache
212 */
213 if (znode_cache)
214 kmem_cache_destroy(znode_cache);
215 znode_cache = NULL;
216
217 if (znode_hold_cache)
218 kmem_cache_destroy(znode_hold_cache);
219 znode_hold_cache = NULL;
220 }
221
222 /*
223 * The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to
224 * serialize access to a znode and its SA buffer while the object is being
225 * created or destroyed. This kind of locking would normally reside in the
226 * znode itself but in this case that's impossible because the znode and SA
227 * buffer may not yet exist. Therefore the locking is handled externally
228 * with an array of mutexes and AVLs trees which contain per-object locks.
229 *
230 * In zfs_znode_hold_enter() a per-object lock is created as needed, inserted
231 * in to the correct AVL tree and finally the per-object lock is held. In
232 * zfs_znode_hold_exit() the process is reversed. The per-object lock is
233 * released, removed from the AVL tree and destroyed if there are no waiters.
234 *
235 * This scheme has two important properties:
236 *
237 * 1) No memory allocations are performed while holding one of the z_hold_locks.
238 * This ensures evict(), which can be called from direct memory reclaim, will
239 * never block waiting on a z_hold_locks which just happens to have hashed
240 * to the same index.
241 *
242 * 2) All locks used to serialize access to an object are per-object and never
243 * shared. This minimizes lock contention without creating a large number
244 * of dedicated locks.
245 *
246 * On the downside it does require znode_lock_t structures to be frequently
247 * allocated and freed. However, because these are backed by a kmem cache
248 * and very short lived this cost is minimal.
249 */
250 int
251 zfs_znode_hold_compare(const void *a, const void *b)
252 {
253 const znode_hold_t *zh_a = (const znode_hold_t *)a;
254 const znode_hold_t *zh_b = (const znode_hold_t *)b;
255
256 return (TREE_CMP(zh_a->zh_obj, zh_b->zh_obj));
257 }
258
259 static boolean_t __maybe_unused
260 zfs_znode_held(zfsvfs_t *zfsvfs, uint64_t obj)
261 {
262 znode_hold_t *zh, search;
263 int i = ZFS_OBJ_HASH(zfsvfs, obj);
264 boolean_t held;
265
266 search.zh_obj = obj;
267
268 mutex_enter(&zfsvfs->z_hold_locks[i]);
269 zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
270 held = (zh && MUTEX_HELD(&zh->zh_lock)) ? B_TRUE : B_FALSE;
271 mutex_exit(&zfsvfs->z_hold_locks[i]);
272
273 return (held);
274 }
275
276 static znode_hold_t *
277 zfs_znode_hold_enter(zfsvfs_t *zfsvfs, uint64_t obj)
278 {
279 znode_hold_t *zh, *zh_new, search;
280 int i = ZFS_OBJ_HASH(zfsvfs, obj);
281 boolean_t found = B_FALSE;
282
283 zh_new = kmem_cache_alloc(znode_hold_cache, KM_SLEEP);
284 zh_new->zh_obj = obj;
285 search.zh_obj = obj;
286
287 mutex_enter(&zfsvfs->z_hold_locks[i]);
288 zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
289 if (likely(zh == NULL)) {
290 zh = zh_new;
291 avl_add(&zfsvfs->z_hold_trees[i], zh);
292 } else {
293 ASSERT3U(zh->zh_obj, ==, obj);
294 found = B_TRUE;
295 }
296 zfs_refcount_add(&zh->zh_refcount, NULL);
297 mutex_exit(&zfsvfs->z_hold_locks[i]);
298
299 if (found == B_TRUE)
300 kmem_cache_free(znode_hold_cache, zh_new);
301
302 ASSERT(MUTEX_NOT_HELD(&zh->zh_lock));
303 ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0);
304 mutex_enter(&zh->zh_lock);
305
306 return (zh);
307 }
308
309 static void
310 zfs_znode_hold_exit(zfsvfs_t *zfsvfs, znode_hold_t *zh)
311 {
312 int i = ZFS_OBJ_HASH(zfsvfs, zh->zh_obj);
313 boolean_t remove = B_FALSE;
314
315 ASSERT(zfs_znode_held(zfsvfs, zh->zh_obj));
316 ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0);
317 mutex_exit(&zh->zh_lock);
318
319 mutex_enter(&zfsvfs->z_hold_locks[i]);
320 if (zfs_refcount_remove(&zh->zh_refcount, NULL) == 0) {
321 avl_remove(&zfsvfs->z_hold_trees[i], zh);
322 remove = B_TRUE;
323 }
324 mutex_exit(&zfsvfs->z_hold_locks[i]);
325
326 if (remove == B_TRUE)
327 kmem_cache_free(znode_hold_cache, zh);
328 }
329
330 dev_t
331 zfs_cmpldev(uint64_t dev)
332 {
333 return (dev);
334 }
335
336 static void
337 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
338 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
339 {
340 ASSERT(zfs_znode_held(zfsvfs, zp->z_id));
341
342 mutex_enter(&zp->z_lock);
343
344 ASSERT(zp->z_sa_hdl == NULL);
345 ASSERT(zp->z_acl_cached == NULL);
346 if (sa_hdl == NULL) {
347 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
348 SA_HDL_SHARED, &zp->z_sa_hdl));
349 } else {
350 zp->z_sa_hdl = sa_hdl;
351 sa_set_userp(sa_hdl, zp);
352 }
353
354 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
355
356 mutex_exit(&zp->z_lock);
357 }
358
359 void
360 zfs_znode_dmu_fini(znode_t *zp)
361 {
362 ASSERT(zfs_znode_held(ZTOZSB(zp), zp->z_id) || zp->z_unlinked ||
363 RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock));
364
365 sa_handle_destroy(zp->z_sa_hdl);
366 zp->z_sa_hdl = NULL;
367 }
368
369 /*
370 * Called by new_inode() to allocate a new inode.
371 */
372 int
373 zfs_inode_alloc(struct super_block *sb, struct inode **ip)
374 {
375 znode_t *zp;
376
377 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
378 *ip = ZTOI(zp);
379
380 return (0);
381 }
382
383 /*
384 * Called in multiple places when an inode should be destroyed.
385 */
386 void
387 zfs_inode_destroy(struct inode *ip)
388 {
389 znode_t *zp = ITOZ(ip);
390 zfsvfs_t *zfsvfs = ZTOZSB(zp);
391
392 mutex_enter(&zfsvfs->z_znodes_lock);
393 if (list_link_active(&zp->z_link_node)) {
394 list_remove(&zfsvfs->z_all_znodes, zp);
395 zfsvfs->z_nr_znodes--;
396 }
397 mutex_exit(&zfsvfs->z_znodes_lock);
398
399 if (zp->z_acl_cached) {
400 zfs_acl_free(zp->z_acl_cached);
401 zp->z_acl_cached = NULL;
402 }
403
404 if (zp->z_xattr_cached) {
405 nvlist_free(zp->z_xattr_cached);
406 zp->z_xattr_cached = NULL;
407 }
408
409 kmem_cache_free(znode_cache, zp);
410 }
411
412 static void
413 zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip)
414 {
415 uint64_t rdev = 0;
416
417 switch (ip->i_mode & S_IFMT) {
418 case S_IFREG:
419 ip->i_op = &zpl_inode_operations;
420 ip->i_fop = &zpl_file_operations;
421 ip->i_mapping->a_ops = &zpl_address_space_operations;
422 break;
423
424 case S_IFDIR:
425 ip->i_op = &zpl_dir_inode_operations;
426 ip->i_fop = &zpl_dir_file_operations;
427 ITOZ(ip)->z_zn_prefetch = B_TRUE;
428 break;
429
430 case S_IFLNK:
431 ip->i_op = &zpl_symlink_inode_operations;
432 break;
433
434 /*
435 * rdev is only stored in a SA only for device files.
436 */
437 case S_IFCHR:
438 case S_IFBLK:
439 (void) sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), &rdev,
440 sizeof (rdev));
441 zfs_fallthrough;
442 case S_IFIFO:
443 case S_IFSOCK:
444 init_special_inode(ip, ip->i_mode, rdev);
445 ip->i_op = &zpl_special_inode_operations;
446 break;
447
448 default:
449 zfs_panic_recover("inode %llu has invalid mode: 0x%x\n",
450 (u_longlong_t)ip->i_ino, ip->i_mode);
451
452 /* Assume the inode is a file and attempt to continue */
453 ip->i_mode = S_IFREG | 0644;
454 ip->i_op = &zpl_inode_operations;
455 ip->i_fop = &zpl_file_operations;
456 ip->i_mapping->a_ops = &zpl_address_space_operations;
457 break;
458 }
459 }
460
461 static void
462 zfs_set_inode_flags(znode_t *zp, struct inode *ip)
463 {
464 /*
465 * Linux and Solaris have different sets of file attributes, so we
466 * restrict this conversion to the intersection of the two.
467 */
468 #ifdef HAVE_INODE_SET_FLAGS
469 unsigned int flags = 0;
470 if (zp->z_pflags & ZFS_IMMUTABLE)
471 flags |= S_IMMUTABLE;
472 if (zp->z_pflags & ZFS_APPENDONLY)
473 flags |= S_APPEND;
474
475 inode_set_flags(ip, flags, S_IMMUTABLE|S_APPEND);
476 #else
477 if (zp->z_pflags & ZFS_IMMUTABLE)
478 ip->i_flags |= S_IMMUTABLE;
479 else
480 ip->i_flags &= ~S_IMMUTABLE;
481
482 if (zp->z_pflags & ZFS_APPENDONLY)
483 ip->i_flags |= S_APPEND;
484 else
485 ip->i_flags &= ~S_APPEND;
486 #endif
487 }
488
489 /*
490 * Update the embedded inode given the znode.
491 */
492 void
493 zfs_znode_update_vfs(znode_t *zp)
494 {
495 zfsvfs_t *zfsvfs;
496 struct inode *ip;
497 uint32_t blksize;
498 u_longlong_t i_blocks;
499
500 ASSERT(zp != NULL);
501 zfsvfs = ZTOZSB(zp);
502 ip = ZTOI(zp);
503
504 /* Skip .zfs control nodes which do not exist on disk. */
505 if (zfsctl_is_node(ip))
506 return;
507
508 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize, &i_blocks);
509
510 spin_lock(&ip->i_lock);
511 ip->i_mode = zp->z_mode;
512 ip->i_blocks = i_blocks;
513 i_size_write(ip, zp->z_size);
514 spin_unlock(&ip->i_lock);
515 }
516
517
518 /*
519 * Construct a znode+inode and initialize.
520 *
521 * This does not do a call to dmu_set_user() that is
522 * up to the caller to do, in case you don't want to
523 * return the znode
524 */
525 static znode_t *
526 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
527 dmu_object_type_t obj_type, sa_handle_t *hdl)
528 {
529 znode_t *zp;
530 struct inode *ip;
531 uint64_t mode;
532 uint64_t parent;
533 uint64_t tmp_gen;
534 uint64_t links;
535 uint64_t z_uid, z_gid;
536 uint64_t atime[2], mtime[2], ctime[2], btime[2];
537 uint64_t projid = ZFS_DEFAULT_PROJID;
538 sa_bulk_attr_t bulk[12];
539 int count = 0;
540
541 ASSERT(zfsvfs != NULL);
542
543 ip = new_inode(zfsvfs->z_sb);
544 if (ip == NULL)
545 return (NULL);
546
547 zp = ITOZ(ip);
548 ASSERT(zp->z_dirlocks == NULL);
549 ASSERT3P(zp->z_acl_cached, ==, NULL);
550 ASSERT3P(zp->z_xattr_cached, ==, NULL);
551 zp->z_unlinked = B_FALSE;
552 zp->z_atime_dirty = B_FALSE;
553 zp->z_is_mapped = B_FALSE;
554 zp->z_is_ctldir = B_FALSE;
555 zp->z_is_stale = B_FALSE;
556 zp->z_suspended = B_FALSE;
557 zp->z_sa_hdl = NULL;
558 zp->z_mapcnt = 0;
559 zp->z_id = db->db_object;
560 zp->z_blksz = blksz;
561 zp->z_seq = 0x7A4653;
562 zp->z_sync_cnt = 0;
563 zp->z_sync_writes_cnt = 0;
564 zp->z_async_writes_cnt = 0;
565
566 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
567
568 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
569 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &tmp_gen, 8);
570 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
571 &zp->z_size, 8);
572 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
573 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
574 &zp->z_pflags, 8);
575 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
576 &parent, 8);
577 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &z_uid, 8);
578 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &z_gid, 8);
579 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
580 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
581 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
582 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
583
584 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || tmp_gen == 0 ||
585 (dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
586 (zp->z_pflags & ZFS_PROJID) &&
587 sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) {
588 if (hdl == NULL)
589 sa_handle_destroy(zp->z_sa_hdl);
590 zp->z_sa_hdl = NULL;
591 goto error;
592 }
593
594 zp->z_projid = projid;
595 zp->z_mode = ip->i_mode = mode;
596 ip->i_generation = (uint32_t)tmp_gen;
597 ip->i_blkbits = SPA_MINBLOCKSHIFT;
598 set_nlink(ip, (uint32_t)links);
599 zfs_uid_write(ip, z_uid);
600 zfs_gid_write(ip, z_gid);
601 zfs_set_inode_flags(zp, ip);
602
603 /* Cache the xattr parent id */
604 if (zp->z_pflags & ZFS_XATTR)
605 zp->z_xattr_parent = parent;
606
607 ZFS_TIME_DECODE(&ip->i_atime, atime);
608 ZFS_TIME_DECODE(&ip->i_mtime, mtime);
609 ZFS_TIME_DECODE(&ip->i_ctime, ctime);
610 ZFS_TIME_DECODE(&zp->z_btime, btime);
611
612 ip->i_ino = zp->z_id;
613 zfs_znode_update_vfs(zp);
614 zfs_inode_set_ops(zfsvfs, ip);
615
616 /*
617 * The only way insert_inode_locked() can fail is if the ip->i_ino
618 * number is already hashed for this super block. This can never
619 * happen because the inode numbers map 1:1 with the object numbers.
620 *
621 * Exceptions include rolling back a mounted file system, either
622 * from the zfs rollback or zfs recv command.
623 *
624 * Active inodes are unhashed during the rollback, but since zrele
625 * can happen asynchronously, we can't guarantee they've been
626 * unhashed. This can cause hash collisions in unlinked drain
627 * processing so do not hash unlinked znodes.
628 */
629 if (links > 0)
630 VERIFY3S(insert_inode_locked(ip), ==, 0);
631
632 mutex_enter(&zfsvfs->z_znodes_lock);
633 list_insert_tail(&zfsvfs->z_all_znodes, zp);
634 zfsvfs->z_nr_znodes++;
635 mutex_exit(&zfsvfs->z_znodes_lock);
636
637 if (links > 0)
638 unlock_new_inode(ip);
639 return (zp);
640
641 error:
642 iput(ip);
643 return (NULL);
644 }
645
646 /*
647 * Safely mark an inode dirty. Inodes which are part of a read-only
648 * file system or snapshot may not be dirtied.
649 */
650 void
651 zfs_mark_inode_dirty(struct inode *ip)
652 {
653 zfsvfs_t *zfsvfs = ITOZSB(ip);
654
655 if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os))
656 return;
657
658 mark_inode_dirty(ip);
659 }
660
661 static uint64_t empty_xattr;
662 static uint64_t pad[4];
663 static zfs_acl_phys_t acl_phys;
664 /*
665 * Create a new DMU object to hold a zfs znode.
666 *
667 * IN: dzp - parent directory for new znode
668 * vap - file attributes for new znode
669 * tx - dmu transaction id for zap operations
670 * cr - credentials of caller
671 * flag - flags:
672 * IS_ROOT_NODE - new object will be root
673 * IS_TMPFILE - new object is of O_TMPFILE
674 * IS_XATTR - new object is an attribute
675 * acl_ids - ACL related attributes
676 *
677 * OUT: zpp - allocated znode (set to dzp if IS_ROOT_NODE)
678 *
679 */
680 void
681 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
682 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
683 {
684 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
685 uint64_t mode, size, links, parent, pflags;
686 uint64_t projid = ZFS_DEFAULT_PROJID;
687 uint64_t rdev = 0;
688 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
689 dmu_buf_t *db;
690 inode_timespec_t now;
691 uint64_t gen, obj;
692 int bonuslen;
693 int dnodesize;
694 sa_handle_t *sa_hdl;
695 dmu_object_type_t obj_type;
696 sa_bulk_attr_t *sa_attrs;
697 int cnt = 0;
698 zfs_acl_locator_cb_t locate = { 0 };
699 znode_hold_t *zh;
700
701 if (zfsvfs->z_replay) {
702 obj = vap->va_nodeid;
703 now = vap->va_ctime; /* see zfs_replay_create() */
704 gen = vap->va_nblocks; /* ditto */
705 dnodesize = vap->va_fsid; /* ditto */
706 } else {
707 obj = 0;
708 gethrestime(&now);
709 gen = dmu_tx_get_txg(tx);
710 dnodesize = dmu_objset_dnodesize(zfsvfs->z_os);
711 }
712
713 if (dnodesize == 0)
714 dnodesize = DNODE_MIN_SIZE;
715
716 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
717
718 bonuslen = (obj_type == DMU_OT_SA) ?
719 DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE;
720
721 /*
722 * Create a new DMU object.
723 */
724 /*
725 * There's currently no mechanism for pre-reading the blocks that will
726 * be needed to allocate a new object, so we accept the small chance
727 * that there will be an i/o error and we will fail one of the
728 * assertions below.
729 */
730 if (S_ISDIR(vap->va_mode)) {
731 if (zfsvfs->z_replay) {
732 VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj,
733 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
734 obj_type, bonuslen, dnodesize, tx));
735 } else {
736 obj = zap_create_norm_dnsize(zfsvfs->z_os,
737 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
738 obj_type, bonuslen, dnodesize, tx);
739 }
740 } else {
741 if (zfsvfs->z_replay) {
742 VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj,
743 DMU_OT_PLAIN_FILE_CONTENTS, 0,
744 obj_type, bonuslen, dnodesize, tx));
745 } else {
746 obj = dmu_object_alloc_dnsize(zfsvfs->z_os,
747 DMU_OT_PLAIN_FILE_CONTENTS, 0,
748 obj_type, bonuslen, dnodesize, tx);
749 }
750 }
751
752 zh = zfs_znode_hold_enter(zfsvfs, obj);
753 VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
754
755 /*
756 * If this is the root, fix up the half-initialized parent pointer
757 * to reference the just-allocated physical data area.
758 */
759 if (flag & IS_ROOT_NODE) {
760 dzp->z_id = obj;
761 }
762
763 /*
764 * If parent is an xattr, so am I.
765 */
766 if (dzp->z_pflags & ZFS_XATTR) {
767 flag |= IS_XATTR;
768 }
769
770 if (zfsvfs->z_use_fuids)
771 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
772 else
773 pflags = 0;
774
775 if (S_ISDIR(vap->va_mode)) {
776 size = 2; /* contents ("." and "..") */
777 links = 2;
778 } else {
779 size = 0;
780 links = (flag & IS_TMPFILE) ? 0 : 1;
781 }
782
783 if (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))
784 rdev = vap->va_rdev;
785
786 parent = dzp->z_id;
787 mode = acl_ids->z_mode;
788 if (flag & IS_XATTR)
789 pflags |= ZFS_XATTR;
790
791 if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode)) {
792 /*
793 * With ZFS_PROJID flag, we can easily know whether there is
794 * project ID stored on disk or not. See zfs_space_delta_cb().
795 */
796 if (obj_type != DMU_OT_ZNODE &&
797 dmu_objset_projectquota_enabled(zfsvfs->z_os))
798 pflags |= ZFS_PROJID;
799
800 /*
801 * Inherit project ID from parent if required.
802 */
803 projid = zfs_inherit_projid(dzp);
804 if (dzp->z_pflags & ZFS_PROJINHERIT)
805 pflags |= ZFS_PROJINHERIT;
806 }
807
808 /*
809 * No execs denied will be determined when zfs_mode_compute() is called.
810 */
811 pflags |= acl_ids->z_aclp->z_hints &
812 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
813 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
814
815 ZFS_TIME_ENCODE(&now, crtime);
816 ZFS_TIME_ENCODE(&now, ctime);
817
818 if (vap->va_mask & ATTR_ATIME) {
819 ZFS_TIME_ENCODE(&vap->va_atime, atime);
820 } else {
821 ZFS_TIME_ENCODE(&now, atime);
822 }
823
824 if (vap->va_mask & ATTR_MTIME) {
825 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
826 } else {
827 ZFS_TIME_ENCODE(&now, mtime);
828 }
829
830 /* Now add in all of the "SA" attributes */
831 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
832 &sa_hdl));
833
834 /*
835 * Setup the array of attributes to be replaced/set on the new file
836 *
837 * order for DMU_OT_ZNODE is critical since it needs to be constructed
838 * in the old znode_phys_t format. Don't change this ordering
839 */
840 sa_attrs = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);
841
842 if (obj_type == DMU_OT_ZNODE) {
843 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
844 NULL, &atime, 16);
845 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
846 NULL, &mtime, 16);
847 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
848 NULL, &ctime, 16);
849 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
850 NULL, &crtime, 16);
851 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
852 NULL, &gen, 8);
853 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
854 NULL, &mode, 8);
855 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
856 NULL, &size, 8);
857 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
858 NULL, &parent, 8);
859 } else {
860 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
861 NULL, &mode, 8);
862 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
863 NULL, &size, 8);
864 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
865 NULL, &gen, 8);
866 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs),
867 NULL, &acl_ids->z_fuid, 8);
868 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs),
869 NULL, &acl_ids->z_fgid, 8);
870 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
871 NULL, &parent, 8);
872 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
873 NULL, &pflags, 8);
874 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
875 NULL, &atime, 16);
876 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
877 NULL, &mtime, 16);
878 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
879 NULL, &ctime, 16);
880 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
881 NULL, &crtime, 16);
882 }
883
884 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
885
886 if (obj_type == DMU_OT_ZNODE) {
887 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
888 &empty_xattr, 8);
889 } else if (dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
890 pflags & ZFS_PROJID) {
891 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PROJID(zfsvfs),
892 NULL, &projid, 8);
893 }
894 if (obj_type == DMU_OT_ZNODE ||
895 (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))) {
896 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
897 NULL, &rdev, 8);
898 }
899 if (obj_type == DMU_OT_ZNODE) {
900 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
901 NULL, &pflags, 8);
902 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
903 &acl_ids->z_fuid, 8);
904 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
905 &acl_ids->z_fgid, 8);
906 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
907 sizeof (uint64_t) * 4);
908 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
909 &acl_phys, sizeof (zfs_acl_phys_t));
910 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
911 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
912 &acl_ids->z_aclp->z_acl_count, 8);
913 locate.cb_aclp = acl_ids->z_aclp;
914 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
915 zfs_acl_data_locator, &locate,
916 acl_ids->z_aclp->z_acl_bytes);
917 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
918 acl_ids->z_fuid, acl_ids->z_fgid);
919 }
920
921 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
922
923 if (!(flag & IS_ROOT_NODE)) {
924 /*
925 * The call to zfs_znode_alloc() may fail if memory is low
926 * via the call path: alloc_inode() -> inode_init_always() ->
927 * security_inode_alloc() -> inode_alloc_security(). Since
928 * the existing code is written such that zfs_mknode() can
929 * not fail retry until sufficient memory has been reclaimed.
930 */
931 do {
932 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
933 } while (*zpp == NULL);
934
935 VERIFY(*zpp != NULL);
936 VERIFY(dzp != NULL);
937 } else {
938 /*
939 * If we are creating the root node, the "parent" we
940 * passed in is the znode for the root.
941 */
942 *zpp = dzp;
943
944 (*zpp)->z_sa_hdl = sa_hdl;
945 }
946
947 (*zpp)->z_pflags = pflags;
948 (*zpp)->z_mode = ZTOI(*zpp)->i_mode = mode;
949 (*zpp)->z_dnodesize = dnodesize;
950 (*zpp)->z_projid = projid;
951
952 if (obj_type == DMU_OT_ZNODE ||
953 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
954 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
955 }
956 kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
957 zfs_znode_hold_exit(zfsvfs, zh);
958 }
959
960 /*
961 * Update in-core attributes. It is assumed the caller will be doing an
962 * sa_bulk_update to push the changes out.
963 */
964 void
965 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
966 {
967 xoptattr_t *xoap;
968 boolean_t update_inode = B_FALSE;
969
970 xoap = xva_getxoptattr(xvap);
971 ASSERT(xoap);
972
973 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
974 uint64_t times[2];
975 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
976 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
977 &times, sizeof (times), tx);
978 XVA_SET_RTN(xvap, XAT_CREATETIME);
979 }
980 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
981 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
982 zp->z_pflags, tx);
983 XVA_SET_RTN(xvap, XAT_READONLY);
984 }
985 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
986 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
987 zp->z_pflags, tx);
988 XVA_SET_RTN(xvap, XAT_HIDDEN);
989 }
990 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
991 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
992 zp->z_pflags, tx);
993 XVA_SET_RTN(xvap, XAT_SYSTEM);
994 }
995 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
996 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
997 zp->z_pflags, tx);
998 XVA_SET_RTN(xvap, XAT_ARCHIVE);
999 }
1000 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
1001 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
1002 zp->z_pflags, tx);
1003 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
1004
1005 update_inode = B_TRUE;
1006 }
1007 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
1008 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
1009 zp->z_pflags, tx);
1010 XVA_SET_RTN(xvap, XAT_NOUNLINK);
1011 }
1012 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
1013 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
1014 zp->z_pflags, tx);
1015 XVA_SET_RTN(xvap, XAT_APPENDONLY);
1016
1017 update_inode = B_TRUE;
1018 }
1019 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
1020 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
1021 zp->z_pflags, tx);
1022 XVA_SET_RTN(xvap, XAT_NODUMP);
1023 }
1024 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
1025 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
1026 zp->z_pflags, tx);
1027 XVA_SET_RTN(xvap, XAT_OPAQUE);
1028 }
1029 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
1030 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
1031 xoap->xoa_av_quarantined, zp->z_pflags, tx);
1032 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
1033 }
1034 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
1035 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
1036 zp->z_pflags, tx);
1037 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
1038 }
1039 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
1040 zfs_sa_set_scanstamp(zp, xvap, tx);
1041 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
1042 }
1043 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
1044 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
1045 zp->z_pflags, tx);
1046 XVA_SET_RTN(xvap, XAT_REPARSE);
1047 }
1048 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
1049 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
1050 zp->z_pflags, tx);
1051 XVA_SET_RTN(xvap, XAT_OFFLINE);
1052 }
1053 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
1054 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
1055 zp->z_pflags, tx);
1056 XVA_SET_RTN(xvap, XAT_SPARSE);
1057 }
1058 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
1059 ZFS_ATTR_SET(zp, ZFS_PROJINHERIT, xoap->xoa_projinherit,
1060 zp->z_pflags, tx);
1061 XVA_SET_RTN(xvap, XAT_PROJINHERIT);
1062 }
1063
1064 if (update_inode)
1065 zfs_set_inode_flags(zp, ZTOI(zp));
1066 }
1067
1068 int
1069 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
1070 {
1071 dmu_object_info_t doi;
1072 dmu_buf_t *db;
1073 znode_t *zp;
1074 znode_hold_t *zh;
1075 int err;
1076 sa_handle_t *hdl;
1077
1078 *zpp = NULL;
1079
1080 again:
1081 zh = zfs_znode_hold_enter(zfsvfs, obj_num);
1082
1083 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1084 if (err) {
1085 zfs_znode_hold_exit(zfsvfs, zh);
1086 return (err);
1087 }
1088
1089 dmu_object_info_from_db(db, &doi);
1090 if (doi.doi_bonus_type != DMU_OT_SA &&
1091 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1092 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1093 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1094 sa_buf_rele(db, NULL);
1095 zfs_znode_hold_exit(zfsvfs, zh);
1096 return (SET_ERROR(EINVAL));
1097 }
1098
1099 hdl = dmu_buf_get_user(db);
1100 if (hdl != NULL) {
1101 zp = sa_get_userdata(hdl);
1102
1103
1104 /*
1105 * Since "SA" does immediate eviction we
1106 * should never find a sa handle that doesn't
1107 * know about the znode.
1108 */
1109
1110 ASSERT3P(zp, !=, NULL);
1111
1112 mutex_enter(&zp->z_lock);
1113 ASSERT3U(zp->z_id, ==, obj_num);
1114 /*
1115 * If zp->z_unlinked is set, the znode is already marked
1116 * for deletion and should not be discovered. Check this
1117 * after checking igrab() due to fsetxattr() & O_TMPFILE.
1118 *
1119 * If igrab() returns NULL the VFS has independently
1120 * determined the inode should be evicted and has
1121 * called iput_final() to start the eviction process.
1122 * The SA handle is still valid but because the VFS
1123 * requires that the eviction succeed we must drop
1124 * our locks and references to allow the eviction to
1125 * complete. The zfs_zget() may then be retried.
1126 *
1127 * This unlikely case could be optimized by registering
1128 * a sops->drop_inode() callback. The callback would
1129 * need to detect the active SA hold thereby informing
1130 * the VFS that this inode should not be evicted.
1131 */
1132 if (igrab(ZTOI(zp)) == NULL) {
1133 if (zp->z_unlinked)
1134 err = SET_ERROR(ENOENT);
1135 else
1136 err = SET_ERROR(EAGAIN);
1137 } else {
1138 *zpp = zp;
1139 err = 0;
1140 }
1141
1142 mutex_exit(&zp->z_lock);
1143 sa_buf_rele(db, NULL);
1144 zfs_znode_hold_exit(zfsvfs, zh);
1145
1146 if (err == EAGAIN) {
1147 /* inode might need this to finish evict */
1148 cond_resched();
1149 goto again;
1150 }
1151 return (err);
1152 }
1153
1154 /*
1155 * Not found create new znode/vnode but only if file exists.
1156 *
1157 * There is a small window where zfs_vget() could
1158 * find this object while a file create is still in
1159 * progress. This is checked for in zfs_znode_alloc()
1160 *
1161 * if zfs_znode_alloc() fails it will drop the hold on the
1162 * bonus buffer.
1163 */
1164 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
1165 doi.doi_bonus_type, NULL);
1166 if (zp == NULL) {
1167 err = SET_ERROR(ENOENT);
1168 } else {
1169 *zpp = zp;
1170 }
1171 zfs_znode_hold_exit(zfsvfs, zh);
1172 return (err);
1173 }
1174
1175 int
1176 zfs_rezget(znode_t *zp)
1177 {
1178 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1179 dmu_object_info_t doi;
1180 dmu_buf_t *db;
1181 uint64_t obj_num = zp->z_id;
1182 uint64_t mode;
1183 uint64_t links;
1184 sa_bulk_attr_t bulk[11];
1185 int err;
1186 int count = 0;
1187 uint64_t gen;
1188 uint64_t z_uid, z_gid;
1189 uint64_t atime[2], mtime[2], ctime[2], btime[2];
1190 uint64_t projid = ZFS_DEFAULT_PROJID;
1191 znode_hold_t *zh;
1192
1193 /*
1194 * skip ctldir, otherwise they will always get invalidated. This will
1195 * cause funny behaviour for the mounted snapdirs. Especially for
1196 * Linux >= 3.18, d_invalidate will detach the mountpoint and prevent
1197 * anyone automount it again as long as someone is still using the
1198 * detached mount.
1199 */
1200 if (zp->z_is_ctldir)
1201 return (0);
1202
1203 zh = zfs_znode_hold_enter(zfsvfs, obj_num);
1204
1205 mutex_enter(&zp->z_acl_lock);
1206 if (zp->z_acl_cached) {
1207 zfs_acl_free(zp->z_acl_cached);
1208 zp->z_acl_cached = NULL;
1209 }
1210 mutex_exit(&zp->z_acl_lock);
1211
1212 rw_enter(&zp->z_xattr_lock, RW_WRITER);
1213 if (zp->z_xattr_cached) {
1214 nvlist_free(zp->z_xattr_cached);
1215 zp->z_xattr_cached = NULL;
1216 }
1217 rw_exit(&zp->z_xattr_lock);
1218
1219 ASSERT(zp->z_sa_hdl == NULL);
1220 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1221 if (err) {
1222 zfs_znode_hold_exit(zfsvfs, zh);
1223 return (err);
1224 }
1225
1226 dmu_object_info_from_db(db, &doi);
1227 if (doi.doi_bonus_type != DMU_OT_SA &&
1228 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1229 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1230 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1231 sa_buf_rele(db, NULL);
1232 zfs_znode_hold_exit(zfsvfs, zh);
1233 return (SET_ERROR(EINVAL));
1234 }
1235
1236 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1237
1238 /* reload cached values */
1239 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1240 &gen, sizeof (gen));
1241 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1242 &zp->z_size, sizeof (zp->z_size));
1243 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1244 &links, sizeof (links));
1245 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1246 &zp->z_pflags, sizeof (zp->z_pflags));
1247 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1248 &z_uid, sizeof (z_uid));
1249 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1250 &z_gid, sizeof (z_gid));
1251 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1252 &mode, sizeof (mode));
1253 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1254 &atime, 16);
1255 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
1256 &mtime, 16);
1257 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
1258 &ctime, 16);
1259 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
1260
1261 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1262 zfs_znode_dmu_fini(zp);
1263 zfs_znode_hold_exit(zfsvfs, zh);
1264 return (SET_ERROR(EIO));
1265 }
1266
1267 if (dmu_objset_projectquota_enabled(zfsvfs->z_os)) {
1268 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs),
1269 &projid, 8);
1270 if (err != 0 && err != ENOENT) {
1271 zfs_znode_dmu_fini(zp);
1272 zfs_znode_hold_exit(zfsvfs, zh);
1273 return (SET_ERROR(err));
1274 }
1275 }
1276
1277 zp->z_projid = projid;
1278 zp->z_mode = ZTOI(zp)->i_mode = mode;
1279 zfs_uid_write(ZTOI(zp), z_uid);
1280 zfs_gid_write(ZTOI(zp), z_gid);
1281
1282 ZFS_TIME_DECODE(&ZTOI(zp)->i_atime, atime);
1283 ZFS_TIME_DECODE(&ZTOI(zp)->i_mtime, mtime);
1284 ZFS_TIME_DECODE(&ZTOI(zp)->i_ctime, ctime);
1285 ZFS_TIME_DECODE(&zp->z_btime, btime);
1286
1287 if ((uint32_t)gen != ZTOI(zp)->i_generation) {
1288 zfs_znode_dmu_fini(zp);
1289 zfs_znode_hold_exit(zfsvfs, zh);
1290 return (SET_ERROR(EIO));
1291 }
1292
1293 set_nlink(ZTOI(zp), (uint32_t)links);
1294 zfs_set_inode_flags(zp, ZTOI(zp));
1295
1296 zp->z_blksz = doi.doi_data_block_size;
1297 zp->z_atime_dirty = B_FALSE;
1298 zfs_znode_update_vfs(zp);
1299
1300 /*
1301 * If the file has zero links, then it has been unlinked on the send
1302 * side and it must be in the received unlinked set.
1303 * We call zfs_znode_dmu_fini() now to prevent any accesses to the
1304 * stale data and to prevent automatic removal of the file in
1305 * zfs_zinactive(). The file will be removed either when it is removed
1306 * on the send side and the next incremental stream is received or
1307 * when the unlinked set gets processed.
1308 */
1309 zp->z_unlinked = (ZTOI(zp)->i_nlink == 0);
1310 if (zp->z_unlinked)
1311 zfs_znode_dmu_fini(zp);
1312
1313 zfs_znode_hold_exit(zfsvfs, zh);
1314
1315 return (0);
1316 }
1317
1318 void
1319 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1320 {
1321 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1322 objset_t *os = zfsvfs->z_os;
1323 uint64_t obj = zp->z_id;
1324 uint64_t acl_obj = zfs_external_acl(zp);
1325 znode_hold_t *zh;
1326
1327 zh = zfs_znode_hold_enter(zfsvfs, obj);
1328 if (acl_obj) {
1329 VERIFY(!zp->z_is_sa);
1330 VERIFY(0 == dmu_object_free(os, acl_obj, tx));
1331 }
1332 VERIFY(0 == dmu_object_free(os, obj, tx));
1333 zfs_znode_dmu_fini(zp);
1334 zfs_znode_hold_exit(zfsvfs, zh);
1335 }
1336
1337 void
1338 zfs_zinactive(znode_t *zp)
1339 {
1340 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1341 uint64_t z_id = zp->z_id;
1342 znode_hold_t *zh;
1343
1344 ASSERT(zp->z_sa_hdl);
1345
1346 /*
1347 * Don't allow a zfs_zget() while were trying to release this znode.
1348 */
1349 zh = zfs_znode_hold_enter(zfsvfs, z_id);
1350
1351 mutex_enter(&zp->z_lock);
1352
1353 /*
1354 * If this was the last reference to a file with no links, remove
1355 * the file from the file system unless the file system is mounted
1356 * read-only. That can happen, for example, if the file system was
1357 * originally read-write, the file was opened, then unlinked and
1358 * the file system was made read-only before the file was finally
1359 * closed. The file will remain in the unlinked set.
1360 */
1361 if (zp->z_unlinked) {
1362 ASSERT(!zfsvfs->z_issnap);
1363 if (!zfs_is_readonly(zfsvfs) && !zfs_unlink_suspend_progress) {
1364 mutex_exit(&zp->z_lock);
1365 zfs_znode_hold_exit(zfsvfs, zh);
1366 zfs_rmnode(zp);
1367 return;
1368 }
1369 }
1370
1371 mutex_exit(&zp->z_lock);
1372 zfs_znode_dmu_fini(zp);
1373
1374 zfs_znode_hold_exit(zfsvfs, zh);
1375 }
1376
1377 #if defined(HAVE_INODE_TIMESPEC64_TIMES)
1378 #define zfs_compare_timespec timespec64_compare
1379 #else
1380 #define zfs_compare_timespec timespec_compare
1381 #endif
1382
1383 /*
1384 * Determine whether the znode's atime must be updated. The logic mostly
1385 * duplicates the Linux kernel's relatime_need_update() functionality.
1386 * This function is only called if the underlying filesystem actually has
1387 * atime updates enabled.
1388 */
1389 boolean_t
1390 zfs_relatime_need_update(const struct inode *ip)
1391 {
1392 inode_timespec_t now;
1393
1394 gethrestime(&now);
1395 /*
1396 * In relatime mode, only update the atime if the previous atime
1397 * is earlier than either the ctime or mtime or if at least a day
1398 * has passed since the last update of atime.
1399 */
1400 if (zfs_compare_timespec(&ip->i_mtime, &ip->i_atime) >= 0)
1401 return (B_TRUE);
1402
1403 if (zfs_compare_timespec(&ip->i_ctime, &ip->i_atime) >= 0)
1404 return (B_TRUE);
1405
1406 if ((hrtime_t)now.tv_sec - (hrtime_t)ip->i_atime.tv_sec >= 24*60*60)
1407 return (B_TRUE);
1408
1409 return (B_FALSE);
1410 }
1411
1412 /*
1413 * Prepare to update znode time stamps.
1414 *
1415 * IN: zp - znode requiring timestamp update
1416 * flag - ATTR_MTIME, ATTR_CTIME flags
1417 *
1418 * OUT: zp - z_seq
1419 * mtime - new mtime
1420 * ctime - new ctime
1421 *
1422 * Note: We don't update atime here, because we rely on Linux VFS to do
1423 * atime updating.
1424 */
1425 void
1426 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1427 uint64_t ctime[2])
1428 {
1429 inode_timespec_t now;
1430
1431 gethrestime(&now);
1432
1433 zp->z_seq++;
1434
1435 if (flag & ATTR_MTIME) {
1436 ZFS_TIME_ENCODE(&now, mtime);
1437 ZFS_TIME_DECODE(&(ZTOI(zp)->i_mtime), mtime);
1438 if (ZTOZSB(zp)->z_use_fuids) {
1439 zp->z_pflags |= (ZFS_ARCHIVE |
1440 ZFS_AV_MODIFIED);
1441 }
1442 }
1443
1444 if (flag & ATTR_CTIME) {
1445 ZFS_TIME_ENCODE(&now, ctime);
1446 ZFS_TIME_DECODE(&(ZTOI(zp)->i_ctime), ctime);
1447 if (ZTOZSB(zp)->z_use_fuids)
1448 zp->z_pflags |= ZFS_ARCHIVE;
1449 }
1450 }
1451
1452 /*
1453 * Grow the block size for a file.
1454 *
1455 * IN: zp - znode of file to free data in.
1456 * size - requested block size
1457 * tx - open transaction.
1458 *
1459 * NOTE: this function assumes that the znode is write locked.
1460 */
1461 void
1462 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1463 {
1464 int error;
1465 u_longlong_t dummy;
1466
1467 if (size <= zp->z_blksz)
1468 return;
1469 /*
1470 * If the file size is already greater than the current blocksize,
1471 * we will not grow. If there is more than one block in a file,
1472 * the blocksize cannot change.
1473 */
1474 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1475 return;
1476
1477 error = dmu_object_set_blocksize(ZTOZSB(zp)->z_os, zp->z_id,
1478 size, 0, tx);
1479
1480 if (error == ENOTSUP)
1481 return;
1482 ASSERT0(error);
1483
1484 /* What blocksize did we actually get? */
1485 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1486 }
1487
1488 /*
1489 * Increase the file length
1490 *
1491 * IN: zp - znode of file to free data in.
1492 * end - new end-of-file
1493 *
1494 * RETURN: 0 on success, error code on failure
1495 */
1496 static int
1497 zfs_extend(znode_t *zp, uint64_t end)
1498 {
1499 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1500 dmu_tx_t *tx;
1501 zfs_locked_range_t *lr;
1502 uint64_t newblksz;
1503 int error;
1504
1505 /*
1506 * We will change zp_size, lock the whole file.
1507 */
1508 lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
1509
1510 /*
1511 * Nothing to do if file already at desired length.
1512 */
1513 if (end <= zp->z_size) {
1514 zfs_rangelock_exit(lr);
1515 return (0);
1516 }
1517 tx = dmu_tx_create(zfsvfs->z_os);
1518 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1519 zfs_sa_upgrade_txholds(tx, zp);
1520 if (end > zp->z_blksz &&
1521 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1522 /*
1523 * We are growing the file past the current block size.
1524 */
1525 if (zp->z_blksz > ZTOZSB(zp)->z_max_blksz) {
1526 /*
1527 * File's blocksize is already larger than the
1528 * "recordsize" property. Only let it grow to
1529 * the next power of 2.
1530 */
1531 ASSERT(!ISP2(zp->z_blksz));
1532 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1533 } else {
1534 newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz);
1535 }
1536 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1537 } else {
1538 newblksz = 0;
1539 }
1540
1541 error = dmu_tx_assign(tx, TXG_WAIT);
1542 if (error) {
1543 dmu_tx_abort(tx);
1544 zfs_rangelock_exit(lr);
1545 return (error);
1546 }
1547
1548 if (newblksz)
1549 zfs_grow_blocksize(zp, newblksz, tx);
1550
1551 zp->z_size = end;
1552
1553 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)),
1554 &zp->z_size, sizeof (zp->z_size), tx));
1555
1556 zfs_rangelock_exit(lr);
1557
1558 dmu_tx_commit(tx);
1559
1560 return (0);
1561 }
1562
1563 /*
1564 * zfs_zero_partial_page - Modeled after update_pages() but
1565 * with different arguments and semantics for use by zfs_freesp().
1566 *
1567 * Zeroes a piece of a single page cache entry for zp at offset
1568 * start and length len.
1569 *
1570 * Caller must acquire a range lock on the file for the region
1571 * being zeroed in order that the ARC and page cache stay in sync.
1572 */
1573 static void
1574 zfs_zero_partial_page(znode_t *zp, uint64_t start, uint64_t len)
1575 {
1576 struct address_space *mp = ZTOI(zp)->i_mapping;
1577 struct page *pp;
1578 int64_t off;
1579 void *pb;
1580
1581 ASSERT((start & PAGE_MASK) == ((start + len - 1) & PAGE_MASK));
1582
1583 off = start & (PAGE_SIZE - 1);
1584 start &= PAGE_MASK;
1585
1586 pp = find_lock_page(mp, start >> PAGE_SHIFT);
1587 if (pp) {
1588 if (mapping_writably_mapped(mp))
1589 flush_dcache_page(pp);
1590
1591 pb = kmap(pp);
1592 memset(pb + off, 0, len);
1593 kunmap(pp);
1594
1595 if (mapping_writably_mapped(mp))
1596 flush_dcache_page(pp);
1597
1598 mark_page_accessed(pp);
1599 SetPageUptodate(pp);
1600 ClearPageError(pp);
1601 unlock_page(pp);
1602 put_page(pp);
1603 }
1604 }
1605
1606 /*
1607 * Free space in a file.
1608 *
1609 * IN: zp - znode of file to free data in.
1610 * off - start of section to free.
1611 * len - length of section to free.
1612 *
1613 * RETURN: 0 on success, error code on failure
1614 */
1615 static int
1616 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1617 {
1618 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1619 zfs_locked_range_t *lr;
1620 int error;
1621
1622 /*
1623 * Lock the range being freed.
1624 */
1625 lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER);
1626
1627 /*
1628 * Nothing to do if file already at desired length.
1629 */
1630 if (off >= zp->z_size) {
1631 zfs_rangelock_exit(lr);
1632 return (0);
1633 }
1634
1635 if (off + len > zp->z_size)
1636 len = zp->z_size - off;
1637
1638 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1639
1640 /*
1641 * Zero partial page cache entries. This must be done under a
1642 * range lock in order to keep the ARC and page cache in sync.
1643 */
1644 if (zp->z_is_mapped) {
1645 loff_t first_page, last_page, page_len;
1646 loff_t first_page_offset, last_page_offset;
1647
1648 /* first possible full page in hole */
1649 first_page = (off + PAGE_SIZE - 1) >> PAGE_SHIFT;
1650 /* last page of hole */
1651 last_page = (off + len) >> PAGE_SHIFT;
1652
1653 /* offset of first_page */
1654 first_page_offset = first_page << PAGE_SHIFT;
1655 /* offset of last_page */
1656 last_page_offset = last_page << PAGE_SHIFT;
1657
1658 /* truncate whole pages */
1659 if (last_page_offset > first_page_offset) {
1660 truncate_inode_pages_range(ZTOI(zp)->i_mapping,
1661 first_page_offset, last_page_offset - 1);
1662 }
1663
1664 /* truncate sub-page ranges */
1665 if (first_page > last_page) {
1666 /* entire punched area within a single page */
1667 zfs_zero_partial_page(zp, off, len);
1668 } else {
1669 /* beginning of punched area at the end of a page */
1670 page_len = first_page_offset - off;
1671 if (page_len > 0)
1672 zfs_zero_partial_page(zp, off, page_len);
1673
1674 /* end of punched area at the beginning of a page */
1675 page_len = off + len - last_page_offset;
1676 if (page_len > 0)
1677 zfs_zero_partial_page(zp, last_page_offset,
1678 page_len);
1679 }
1680 }
1681 zfs_rangelock_exit(lr);
1682
1683 return (error);
1684 }
1685
1686 /*
1687 * Truncate a file
1688 *
1689 * IN: zp - znode of file to free data in.
1690 * end - new end-of-file.
1691 *
1692 * RETURN: 0 on success, error code on failure
1693 */
1694 static int
1695 zfs_trunc(znode_t *zp, uint64_t end)
1696 {
1697 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1698 dmu_tx_t *tx;
1699 zfs_locked_range_t *lr;
1700 int error;
1701 sa_bulk_attr_t bulk[2];
1702 int count = 0;
1703
1704 /*
1705 * We will change zp_size, lock the whole file.
1706 */
1707 lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
1708
1709 /*
1710 * Nothing to do if file already at desired length.
1711 */
1712 if (end >= zp->z_size) {
1713 zfs_rangelock_exit(lr);
1714 return (0);
1715 }
1716
1717 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
1718 DMU_OBJECT_END);
1719 if (error) {
1720 zfs_rangelock_exit(lr);
1721 return (error);
1722 }
1723 tx = dmu_tx_create(zfsvfs->z_os);
1724 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1725 zfs_sa_upgrade_txholds(tx, zp);
1726 dmu_tx_mark_netfree(tx);
1727 error = dmu_tx_assign(tx, TXG_WAIT);
1728 if (error) {
1729 dmu_tx_abort(tx);
1730 zfs_rangelock_exit(lr);
1731 return (error);
1732 }
1733
1734 zp->z_size = end;
1735 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1736 NULL, &zp->z_size, sizeof (zp->z_size));
1737
1738 if (end == 0) {
1739 zp->z_pflags &= ~ZFS_SPARSE;
1740 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1741 NULL, &zp->z_pflags, 8);
1742 }
1743 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
1744
1745 dmu_tx_commit(tx);
1746 zfs_rangelock_exit(lr);
1747
1748 return (0);
1749 }
1750
1751 /*
1752 * Free space in a file
1753 *
1754 * IN: zp - znode of file to free data in.
1755 * off - start of range
1756 * len - end of range (0 => EOF)
1757 * flag - current file open mode flags.
1758 * log - TRUE if this action should be logged
1759 *
1760 * RETURN: 0 on success, error code on failure
1761 */
1762 int
1763 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1764 {
1765 dmu_tx_t *tx;
1766 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1767 zilog_t *zilog = zfsvfs->z_log;
1768 uint64_t mode;
1769 uint64_t mtime[2], ctime[2];
1770 sa_bulk_attr_t bulk[3];
1771 int count = 0;
1772 int error;
1773
1774 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1775 sizeof (mode))) != 0)
1776 return (error);
1777
1778 if (off > zp->z_size) {
1779 error = zfs_extend(zp, off+len);
1780 if (error == 0 && log)
1781 goto log;
1782 goto out;
1783 }
1784
1785 if (len == 0) {
1786 error = zfs_trunc(zp, off);
1787 } else {
1788 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1789 off + len > zp->z_size)
1790 error = zfs_extend(zp, off+len);
1791 }
1792 if (error || !log)
1793 goto out;
1794 log:
1795 tx = dmu_tx_create(zfsvfs->z_os);
1796 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1797 zfs_sa_upgrade_txholds(tx, zp);
1798 error = dmu_tx_assign(tx, TXG_WAIT);
1799 if (error) {
1800 dmu_tx_abort(tx);
1801 goto out;
1802 }
1803
1804 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1805 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1806 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1807 NULL, &zp->z_pflags, 8);
1808 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
1809 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1810 ASSERT(error == 0);
1811
1812 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1813
1814 dmu_tx_commit(tx);
1815
1816 zfs_znode_update_vfs(zp);
1817 error = 0;
1818
1819 out:
1820 /*
1821 * Truncate the page cache - for file truncate operations, use
1822 * the purpose-built API for truncations. For punching operations,
1823 * the truncation is handled under a range lock in zfs_free_range.
1824 */
1825 if (len == 0)
1826 truncate_setsize(ZTOI(zp), off);
1827 return (error);
1828 }
1829
1830 void
1831 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1832 {
1833 struct super_block *sb;
1834 zfsvfs_t *zfsvfs;
1835 uint64_t moid, obj, sa_obj, version;
1836 uint64_t sense = ZFS_CASE_SENSITIVE;
1837 uint64_t norm = 0;
1838 nvpair_t *elem;
1839 int size;
1840 int error;
1841 int i;
1842 znode_t *rootzp = NULL;
1843 vattr_t vattr;
1844 znode_t *zp;
1845 zfs_acl_ids_t acl_ids;
1846
1847 /*
1848 * First attempt to create master node.
1849 */
1850 /*
1851 * In an empty objset, there are no blocks to read and thus
1852 * there can be no i/o errors (which we assert below).
1853 */
1854 moid = MASTER_NODE_OBJ;
1855 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1856 DMU_OT_NONE, 0, tx);
1857 ASSERT(error == 0);
1858
1859 /*
1860 * Set starting attributes.
1861 */
1862 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1863 elem = NULL;
1864 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1865 /* For the moment we expect all zpl props to be uint64_ts */
1866 uint64_t val;
1867 char *name;
1868
1869 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1870 VERIFY(nvpair_value_uint64(elem, &val) == 0);
1871 name = nvpair_name(elem);
1872 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1873 if (val < version)
1874 version = val;
1875 } else {
1876 error = zap_update(os, moid, name, 8, 1, &val, tx);
1877 }
1878 ASSERT(error == 0);
1879 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1880 norm = val;
1881 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1882 sense = val;
1883 }
1884 ASSERT(version != 0);
1885 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1886
1887 /*
1888 * Create zap object used for SA attribute registration
1889 */
1890
1891 if (version >= ZPL_VERSION_SA) {
1892 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1893 DMU_OT_NONE, 0, tx);
1894 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1895 ASSERT(error == 0);
1896 } else {
1897 sa_obj = 0;
1898 }
1899 /*
1900 * Create a delete queue.
1901 */
1902 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1903
1904 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1905 ASSERT(error == 0);
1906
1907 /*
1908 * Create root znode. Create minimal znode/inode/zfsvfs/sb
1909 * to allow zfs_mknode to work.
1910 */
1911 vattr.va_mask = ATTR_MODE|ATTR_UID|ATTR_GID;
1912 vattr.va_mode = S_IFDIR|0755;
1913 vattr.va_uid = crgetuid(cr);
1914 vattr.va_gid = crgetgid(cr);
1915
1916 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1917 rootzp->z_unlinked = B_FALSE;
1918 rootzp->z_atime_dirty = B_FALSE;
1919 rootzp->z_is_sa = USE_SA(version, os);
1920 rootzp->z_pflags = 0;
1921
1922 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1923 zfsvfs->z_os = os;
1924 zfsvfs->z_parent = zfsvfs;
1925 zfsvfs->z_version = version;
1926 zfsvfs->z_use_fuids = USE_FUIDS(version, os);
1927 zfsvfs->z_use_sa = USE_SA(version, os);
1928 zfsvfs->z_norm = norm;
1929
1930 sb = kmem_zalloc(sizeof (struct super_block), KM_SLEEP);
1931 sb->s_fs_info = zfsvfs;
1932
1933 ZTOI(rootzp)->i_sb = sb;
1934
1935 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1936 &zfsvfs->z_attr_table);
1937
1938 ASSERT(error == 0);
1939
1940 /*
1941 * Fold case on file systems that are always or sometimes case
1942 * insensitive.
1943 */
1944 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1945 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
1946
1947 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1948 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1949 offsetof(znode_t, z_link_node));
1950
1951 size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX);
1952 zfsvfs->z_hold_size = size;
1953 zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size,
1954 KM_SLEEP);
1955 zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP);
1956 for (i = 0; i != size; i++) {
1957 avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare,
1958 sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node));
1959 mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL);
1960 }
1961
1962 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1963 cr, NULL, &acl_ids));
1964 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
1965 ASSERT3P(zp, ==, rootzp);
1966 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
1967 ASSERT(error == 0);
1968 zfs_acl_ids_free(&acl_ids);
1969
1970 atomic_set(&ZTOI(rootzp)->i_count, 0);
1971 sa_handle_destroy(rootzp->z_sa_hdl);
1972 kmem_cache_free(znode_cache, rootzp);
1973
1974 for (i = 0; i != size; i++) {
1975 avl_destroy(&zfsvfs->z_hold_trees[i]);
1976 mutex_destroy(&zfsvfs->z_hold_locks[i]);
1977 }
1978
1979 mutex_destroy(&zfsvfs->z_znodes_lock);
1980
1981 vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size);
1982 vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size);
1983 kmem_free(sb, sizeof (struct super_block));
1984 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1985 }
1986 #endif /* _KERNEL */
1987
1988 static int
1989 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
1990 {
1991 uint64_t sa_obj = 0;
1992 int error;
1993
1994 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
1995 if (error != 0 && error != ENOENT)
1996 return (error);
1997
1998 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
1999 return (error);
2000 }
2001
2002 static int
2003 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
2004 dmu_buf_t **db, const void *tag)
2005 {
2006 dmu_object_info_t doi;
2007 int error;
2008
2009 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
2010 return (error);
2011
2012 dmu_object_info_from_db(*db, &doi);
2013 if ((doi.doi_bonus_type != DMU_OT_SA &&
2014 doi.doi_bonus_type != DMU_OT_ZNODE) ||
2015 (doi.doi_bonus_type == DMU_OT_ZNODE &&
2016 doi.doi_bonus_size < sizeof (znode_phys_t))) {
2017 sa_buf_rele(*db, tag);
2018 return (SET_ERROR(ENOTSUP));
2019 }
2020
2021 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
2022 if (error != 0) {
2023 sa_buf_rele(*db, tag);
2024 return (error);
2025 }
2026
2027 return (0);
2028 }
2029
2030 static void
2031 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, const void *tag)
2032 {
2033 sa_handle_destroy(hdl);
2034 sa_buf_rele(db, tag);
2035 }
2036
2037 /*
2038 * Given an object number, return its parent object number and whether
2039 * or not the object is an extended attribute directory.
2040 */
2041 static int
2042 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
2043 uint64_t *pobjp, int *is_xattrdir)
2044 {
2045 uint64_t parent;
2046 uint64_t pflags;
2047 uint64_t mode;
2048 uint64_t parent_mode;
2049 sa_bulk_attr_t bulk[3];
2050 sa_handle_t *sa_hdl;
2051 dmu_buf_t *sa_db;
2052 int count = 0;
2053 int error;
2054
2055 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
2056 &parent, sizeof (parent));
2057 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
2058 &pflags, sizeof (pflags));
2059 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2060 &mode, sizeof (mode));
2061
2062 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
2063 return (error);
2064
2065 /*
2066 * When a link is removed its parent pointer is not changed and will
2067 * be invalid. There are two cases where a link is removed but the
2068 * file stays around, when it goes to the delete queue and when there
2069 * are additional links.
2070 */
2071 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
2072 if (error != 0)
2073 return (error);
2074
2075 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
2076 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2077 if (error != 0)
2078 return (error);
2079
2080 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
2081
2082 /*
2083 * Extended attributes can be applied to files, directories, etc.
2084 * Otherwise the parent must be a directory.
2085 */
2086 if (!*is_xattrdir && !S_ISDIR(parent_mode))
2087 return (SET_ERROR(EINVAL));
2088
2089 *pobjp = parent;
2090
2091 return (0);
2092 }
2093
2094 /*
2095 * Given an object number, return some zpl level statistics
2096 */
2097 static int
2098 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
2099 zfs_stat_t *sb)
2100 {
2101 sa_bulk_attr_t bulk[4];
2102 int count = 0;
2103
2104 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
2105 &sb->zs_mode, sizeof (sb->zs_mode));
2106 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
2107 &sb->zs_gen, sizeof (sb->zs_gen));
2108 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
2109 &sb->zs_links, sizeof (sb->zs_links));
2110 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
2111 &sb->zs_ctime, sizeof (sb->zs_ctime));
2112
2113 return (sa_bulk_lookup(hdl, bulk, count));
2114 }
2115
2116 static int
2117 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
2118 sa_attr_type_t *sa_table, char *buf, int len)
2119 {
2120 sa_handle_t *sa_hdl;
2121 sa_handle_t *prevhdl = NULL;
2122 dmu_buf_t *prevdb = NULL;
2123 dmu_buf_t *sa_db = NULL;
2124 char *path = buf + len - 1;
2125 int error;
2126
2127 *path = '\0';
2128 sa_hdl = hdl;
2129
2130 uint64_t deleteq_obj;
2131 VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ,
2132 ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));
2133 error = zap_lookup_int(osp, deleteq_obj, obj);
2134 if (error == 0) {
2135 return (ESTALE);
2136 } else if (error != ENOENT) {
2137 return (error);
2138 }
2139 error = 0;
2140
2141 for (;;) {
2142 uint64_t pobj = 0;
2143 char component[MAXNAMELEN + 2];
2144 size_t complen;
2145 int is_xattrdir = 0;
2146
2147 if (prevdb) {
2148 ASSERT(prevhdl != NULL);
2149 zfs_release_sa_handle(prevhdl, prevdb, FTAG);
2150 }
2151
2152 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
2153 &is_xattrdir)) != 0)
2154 break;
2155
2156 if (pobj == obj) {
2157 if (path[0] != '/')
2158 *--path = '/';
2159 break;
2160 }
2161
2162 component[0] = '/';
2163 if (is_xattrdir) {
2164 strcpy(component + 1, "<xattrdir>");
2165 } else {
2166 error = zap_value_search(osp, pobj, obj,
2167 ZFS_DIRENT_OBJ(-1ULL), component + 1);
2168 if (error != 0)
2169 break;
2170 }
2171
2172 complen = strlen(component);
2173 path -= complen;
2174 ASSERT(path >= buf);
2175 memcpy(path, component, complen);
2176 obj = pobj;
2177
2178 if (sa_hdl != hdl) {
2179 prevhdl = sa_hdl;
2180 prevdb = sa_db;
2181 }
2182 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
2183 if (error != 0) {
2184 sa_hdl = prevhdl;
2185 sa_db = prevdb;
2186 break;
2187 }
2188 }
2189
2190 if (sa_hdl != NULL && sa_hdl != hdl) {
2191 ASSERT(sa_db != NULL);
2192 zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
2193 }
2194
2195 if (error == 0)
2196 (void) memmove(buf, path, buf + len - path);
2197
2198 return (error);
2199 }
2200
2201 int
2202 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
2203 {
2204 sa_attr_type_t *sa_table;
2205 sa_handle_t *hdl;
2206 dmu_buf_t *db;
2207 int error;
2208
2209 error = zfs_sa_setup(osp, &sa_table);
2210 if (error != 0)
2211 return (error);
2212
2213 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2214 if (error != 0)
2215 return (error);
2216
2217 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2218
2219 zfs_release_sa_handle(hdl, db, FTAG);
2220 return (error);
2221 }
2222
2223 int
2224 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
2225 char *buf, int len)
2226 {
2227 char *path = buf + len - 1;
2228 sa_attr_type_t *sa_table;
2229 sa_handle_t *hdl;
2230 dmu_buf_t *db;
2231 int error;
2232
2233 *path = '\0';
2234
2235 error = zfs_sa_setup(osp, &sa_table);
2236 if (error != 0)
2237 return (error);
2238
2239 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
2240 if (error != 0)
2241 return (error);
2242
2243 error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
2244 if (error != 0) {
2245 zfs_release_sa_handle(hdl, db, FTAG);
2246 return (error);
2247 }
2248
2249 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
2250
2251 zfs_release_sa_handle(hdl, db, FTAG);
2252 return (error);
2253 }
2254
2255 #if defined(_KERNEL)
2256 EXPORT_SYMBOL(zfs_create_fs);
2257 EXPORT_SYMBOL(zfs_obj_to_path);
2258
2259 /* CSTYLED */
2260 module_param(zfs_object_mutex_size, uint, 0644);
2261 MODULE_PARM_DESC(zfs_object_mutex_size, "Size of znode hold array");
2262 module_param(zfs_unlink_suspend_progress, int, 0644);
2263 MODULE_PARM_DESC(zfs_unlink_suspend_progress, "Set to prevent async unlinks "
2264 "(debug - leaks space into the unlinked set)");
2265 #endif
OpenZFS on Linux and FreeBSD