1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * This file and its contents are supplied under the terms of the
4 * Common Development and Distribution License ("CDDL"), version 1.0.
5 * You may only use this file in accordance with the terms of version
6 * 1.0 of the CDDL.
7 *
8 * A full copy of the text of the CDDL should have accompanied this
9 * source. A copy of the CDDL is also available via the Internet at
10 * https://opensource.org/license/CDDL-1.0.
11 */
12 /*
13 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
14 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
15 */
16
17 /* Portions Copyright 2007 Jeremy Teo */
18
19 #include <sys/types.h>
20 #include <sys/param.h>
21 #include <sys/time.h>
22 #include <sys/sysmacros.h>
23 #include <sys/mntent.h>
24 #include <sys/u8_textprep.h>
25 #include <sys/dsl_dataset.h>
26 #include <sys/vfs.h>
27 #include <sys/vnode.h>
28 #include <sys/file.h>
29 #include <sys/kmem.h>
30 #include <sys/errno.h>
31 #include <sys/atomic.h>
32 #include <sys/zfs_dir.h>
33 #include <sys/zfs_acl_impl.h>
34 #include <sys/zfs_ioctl.h>
35 #include <sys/zfs_rlock.h>
36 #include <sys/zfs_fuid.h>
37 #include <sys/zfs_vnops.h>
38 #include <sys/zfs_ctldir.h>
39 #include <sys/dnode.h>
40 #include <sys/fs/zfs.h>
41 #include <sys/zpl.h>
42 #include <sys/dmu.h>
43 #include <sys/dmu_objset.h>
44 #include <sys/dmu_tx.h>
45 #include <sys/zfs_refcount.h>
46 #include <sys/stat.h>
47 #include <sys/zap.h>
48 #include <sys/zfs_znode.h>
49 #include <sys/sa.h>
50 #include <sys/zfs_sa.h>
51 #include <sys/zfs_stat.h>
52 #include <linux/mm_compat.h>
53 #ifdef CONFIG_FS_POSIX_ACL
54 #include <linux/posix_acl.h>
55 #endif
56
57 #include "zfs_prop.h"
58 #include "zfs_comutil.h"
59
60 static kmem_cache_t *znode_cache = NULL;
61 static kmem_cache_t *znode_hold_cache = NULL;
62 unsigned int zfs_object_mutex_size = ZFS_OBJ_MTX_SZ;
63
64 /*
65 * This is used by the test suite so that it can delay znodes from being
66 * freed in order to inspect the unlinked set.
67 */
68 static int zfs_unlink_suspend_progress = 0;
69
70 /*
71 * This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on
72 * z_rangelock. It will modify the offset and length of the lock to reflect
73 * znode-specific information, and convert RL_APPEND to RL_WRITER. This is
74 * called with the rangelock_t's rl_lock held, which avoids races.
75 */
76 static void
zfs_rangelock_cb(zfs_locked_range_t * new,void * arg)77 zfs_rangelock_cb(zfs_locked_range_t *new, void *arg)
78 {
79 znode_t *zp = arg;
80
81 /*
82 * If in append mode, convert to writer and lock starting at the
83 * current end of file.
84 */
85 if (new->lr_type == RL_APPEND) {
86 new->lr_offset = zp->z_size;
87 new->lr_type = RL_WRITER;
88 }
89
90 /*
91 * If we might grow the block size then lock the whole file range.
92 * NB: this test should match the check in zfs_grow_blocksize
93 */
94 uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length);
95 if (zp->z_size <= zp->z_blksz && end_size > zp->z_blksz &&
96 (!ISP2(zp->z_blksz) || zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) {
97 new->lr_offset = 0;
98 new->lr_length = UINT64_MAX;
99 }
100 }
101
102 static int
zfs_znode_cache_constructor(void * buf,void * arg,int kmflags)103 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
104 {
105 (void) arg, (void) kmflags;
106 znode_t *zp = buf;
107
108 inode_init_once(ZTOI(zp));
109 list_link_init(&zp->z_link_node);
110
111 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
112 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
113 rw_init(&zp->z_name_lock, NULL, RW_NOLOCKDEP, NULL);
114 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
115 rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);
116
117 zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp);
118
119 zp->z_dirlocks = NULL;
120 zp->z_acl_cached = NULL;
121 zp->z_xattr_cached = NULL;
122 zp->z_xattr_parent = 0;
123 zp->z_has_seq = B_FALSE;
124
125 return (0);
126 }
127
128 static void
zfs_znode_cache_destructor(void * buf,void * arg)129 zfs_znode_cache_destructor(void *buf, void *arg)
130 {
131 (void) arg;
132 znode_t *zp = buf;
133
134 ASSERT(!list_link_active(&zp->z_link_node));
135 mutex_destroy(&zp->z_lock);
136 rw_destroy(&zp->z_parent_lock);
137 rw_destroy(&zp->z_name_lock);
138 mutex_destroy(&zp->z_acl_lock);
139 rw_destroy(&zp->z_xattr_lock);
140 zfs_rangelock_fini(&zp->z_rangelock);
141
142 ASSERT0P(zp->z_dirlocks);
143 ASSERT0P(zp->z_acl_cached);
144 ASSERT0P(zp->z_xattr_cached);
145 }
146
147 static int
zfs_znode_hold_cache_constructor(void * buf,void * arg,int kmflags)148 zfs_znode_hold_cache_constructor(void *buf, void *arg, int kmflags)
149 {
150 (void) arg, (void) kmflags;
151 znode_hold_t *zh = buf;
152
153 mutex_init(&zh->zh_lock, NULL, MUTEX_DEFAULT, NULL);
154 zh->zh_refcount = 0;
155
156 return (0);
157 }
158
159 static void
zfs_znode_hold_cache_destructor(void * buf,void * arg)160 zfs_znode_hold_cache_destructor(void *buf, void *arg)
161 {
162 (void) arg;
163 znode_hold_t *zh = buf;
164
165 mutex_destroy(&zh->zh_lock);
166 }
167
168 void
zfs_znode_init(void)169 zfs_znode_init(void)
170 {
171 /*
172 * Initialize zcache. The KMC_SLAB hint is used in order that it be
173 * backed by kmalloc() when on the Linux slab in order that any
174 * wait_on_bit() operations on the related inode operate properly.
175 */
176 ASSERT0P(znode_cache);
177 znode_cache = kmem_cache_create("zfs_znode_cache",
178 sizeof (znode_t), 0, zfs_znode_cache_constructor,
179 zfs_znode_cache_destructor, NULL, NULL, NULL,
180 KMC_SLAB | KMC_RECLAIMABLE);
181
182 ASSERT0P(znode_hold_cache);
183 znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache",
184 sizeof (znode_hold_t), 0, zfs_znode_hold_cache_constructor,
185 zfs_znode_hold_cache_destructor, NULL, NULL, NULL, 0);
186 }
187
188 void
zfs_znode_fini(void)189 zfs_znode_fini(void)
190 {
191 /*
192 * Cleanup zcache
193 */
194 if (znode_cache)
195 kmem_cache_destroy(znode_cache);
196 znode_cache = NULL;
197
198 if (znode_hold_cache)
199 kmem_cache_destroy(znode_hold_cache);
200 znode_hold_cache = NULL;
201 }
202
203 /*
204 * The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to
205 * serialize access to a znode and its SA buffer while the object is being
206 * created or destroyed. This kind of locking would normally reside in the
207 * znode itself but in this case that's impossible because the znode and SA
208 * buffer may not yet exist. Therefore the locking is handled externally
209 * with an array of mutexes and AVLs trees which contain per-object locks.
210 *
211 * In zfs_znode_hold_enter() a per-object lock is created as needed, inserted
212 * in to the correct AVL tree and finally the per-object lock is held. In
213 * zfs_znode_hold_exit() the process is reversed. The per-object lock is
214 * released, removed from the AVL tree and destroyed if there are no waiters.
215 *
216 * This scheme has two important properties:
217 *
218 * 1) No memory allocations are performed while holding one of the z_hold_locks.
219 * This ensures evict(), which can be called from direct memory reclaim, will
220 * never block waiting on a z_hold_locks which just happens to have hashed
221 * to the same index.
222 *
223 * 2) All locks used to serialize access to an object are per-object and never
224 * shared. This minimizes lock contention without creating a large number
225 * of dedicated locks.
226 *
227 * On the downside it does require znode_lock_t structures to be frequently
228 * allocated and freed. However, because these are backed by a kmem cache
229 * and very short lived this cost is minimal.
230 */
231 int
zfs_znode_hold_compare(const void * a,const void * b)232 zfs_znode_hold_compare(const void *a, const void *b)
233 {
234 const znode_hold_t *zh_a = (const znode_hold_t *)a;
235 const znode_hold_t *zh_b = (const znode_hold_t *)b;
236
237 return (TREE_CMP(zh_a->zh_obj, zh_b->zh_obj));
238 }
239
240 static boolean_t __maybe_unused
zfs_znode_held(zfsvfs_t * zfsvfs,uint64_t obj)241 zfs_znode_held(zfsvfs_t *zfsvfs, uint64_t obj)
242 {
243 znode_hold_t *zh, search;
244 int i = ZFS_OBJ_HASH(zfsvfs, obj);
245 boolean_t held;
246
247 search.zh_obj = obj;
248
249 mutex_enter(&zfsvfs->z_hold_locks[i]);
250 zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
251 held = (zh && MUTEX_HELD(&zh->zh_lock)) ? B_TRUE : B_FALSE;
252 mutex_exit(&zfsvfs->z_hold_locks[i]);
253
254 return (held);
255 }
256
257 znode_hold_t *
zfs_znode_hold_enter(zfsvfs_t * zfsvfs,uint64_t obj)258 zfs_znode_hold_enter(zfsvfs_t *zfsvfs, uint64_t obj)
259 {
260 znode_hold_t *zh, *zh_new, search;
261 int i = ZFS_OBJ_HASH(zfsvfs, obj);
262 boolean_t found = B_FALSE;
263
264 zh_new = kmem_cache_alloc(znode_hold_cache, KM_SLEEP);
265 search.zh_obj = obj;
266
267 mutex_enter(&zfsvfs->z_hold_locks[i]);
268 zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
269 if (likely(zh == NULL)) {
270 zh = zh_new;
271 zh->zh_obj = obj;
272 avl_add(&zfsvfs->z_hold_trees[i], zh);
273 } else {
274 ASSERT3U(zh->zh_obj, ==, obj);
275 found = B_TRUE;
276 }
277 zh->zh_refcount++;
278 ASSERT3S(zh->zh_refcount, >, 0);
279 mutex_exit(&zfsvfs->z_hold_locks[i]);
280
281 if (found == B_TRUE)
282 kmem_cache_free(znode_hold_cache, zh_new);
283
284 ASSERT(MUTEX_NOT_HELD(&zh->zh_lock));
285 mutex_enter(&zh->zh_lock);
286
287 return (zh);
288 }
289
290 void
zfs_znode_hold_exit(zfsvfs_t * zfsvfs,znode_hold_t * zh)291 zfs_znode_hold_exit(zfsvfs_t *zfsvfs, znode_hold_t *zh)
292 {
293 int i = ZFS_OBJ_HASH(zfsvfs, zh->zh_obj);
294 boolean_t remove = B_FALSE;
295
296 ASSERT(zfs_znode_held(zfsvfs, zh->zh_obj));
297 mutex_exit(&zh->zh_lock);
298
299 mutex_enter(&zfsvfs->z_hold_locks[i]);
300 ASSERT3S(zh->zh_refcount, >, 0);
301 if (--zh->zh_refcount == 0) {
302 avl_remove(&zfsvfs->z_hold_trees[i], zh);
303 remove = B_TRUE;
304 }
305 mutex_exit(&zfsvfs->z_hold_locks[i]);
306
307 if (remove == B_TRUE)
308 kmem_cache_free(znode_hold_cache, zh);
309 }
310
311 dev_t
zfs_cmpldev(uint64_t dev)312 zfs_cmpldev(uint64_t dev)
313 {
314 return (dev);
315 }
316
317 static void
zfs_znode_sa_init(zfsvfs_t * zfsvfs,znode_t * zp,dmu_buf_t * db,dmu_object_type_t obj_type,sa_handle_t * sa_hdl)318 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
319 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
320 {
321 ASSERT(zfs_znode_held(zfsvfs, zp->z_id));
322
323 mutex_enter(&zp->z_lock);
324
325 ASSERT0P(zp->z_sa_hdl);
326 ASSERT0P(zp->z_acl_cached);
327 if (sa_hdl == NULL) {
328 VERIFY0(sa_handle_get_from_db(zfsvfs->z_os, db, zp,
329 SA_HDL_SHARED, &zp->z_sa_hdl));
330 } else {
331 zp->z_sa_hdl = sa_hdl;
332 sa_set_userp(sa_hdl, zp);
333 }
334
335 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
336
337 mutex_exit(&zp->z_lock);
338 }
339
340 void
zfs_znode_dmu_fini(znode_t * zp)341 zfs_znode_dmu_fini(znode_t *zp)
342 {
343 ASSERT(zfs_znode_held(ZTOZSB(zp), zp->z_id) ||
344 RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock));
345
346 sa_handle_destroy(zp->z_sa_hdl);
347 zp->z_sa_hdl = NULL;
348 }
349
350 /*
351 * Called by new_inode() to allocate a new inode.
352 */
353 int
zfs_inode_alloc(struct super_block * sb,struct inode ** ip)354 zfs_inode_alloc(struct super_block *sb, struct inode **ip)
355 {
356 znode_t *zp;
357
358 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
359 *ip = ZTOI(zp);
360
361 return (0);
362 }
363
364 void
zfs_inode_free(struct inode * ip)365 zfs_inode_free(struct inode *ip)
366 {
367 kmem_cache_free(znode_cache, ITOZ(ip));
368 }
369
370 /*
371 * Called in multiple places when an inode should be destroyed.
372 */
373 void
zfs_inode_destroy(struct inode * ip)374 zfs_inode_destroy(struct inode *ip)
375 {
376 znode_t *zp = ITOZ(ip);
377 zfsvfs_t *zfsvfs = ZTOZSB(zp);
378
379 mutex_enter(&zfsvfs->z_znodes_lock);
380 if (list_link_active(&zp->z_link_node)) {
381 list_remove(&zfsvfs->z_all_znodes, zp);
382 }
383 mutex_exit(&zfsvfs->z_znodes_lock);
384
385 if (zp->z_acl_cached) {
386 zfs_acl_free(zp->z_acl_cached);
387 zp->z_acl_cached = NULL;
388 }
389
390 if (zp->z_xattr_cached) {
391 nvlist_free(zp->z_xattr_cached);
392 zp->z_xattr_cached = NULL;
393 }
394 #ifndef HAVE_SOPS_FREE_INODE
395 /*
396 * inode needs to be freed in RCU callback. If we have
397 * super_operations->free_inode, Linux kernel will do call_rcu
398 * for us. But if we don't have it, since call_rcu is GPL-only
399 * symbol, we can only free synchronously and accept the risk.
400 */
401 zfs_inode_free(ip);
402 #endif
403 }
404
405 static void
zfs_inode_set_ops(zfsvfs_t * zfsvfs,struct inode * ip)406 zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip)
407 {
408 uint64_t rdev = 0;
409
410 switch (ip->i_mode & S_IFMT) {
411 case S_IFREG:
412 ip->i_op = &zpl_inode_operations;
413 ip->i_fop = &zpl_file_operations;
414 ip->i_mapping->a_ops = &zpl_address_space_operations;
415 break;
416
417 case S_IFDIR:
418 ip->i_op = &zpl_dir_inode_operations;
419 ip->i_fop = &zpl_dir_file_operations;
420 ITOZ(ip)->z_zn_prefetch = B_TRUE;
421 break;
422
423 case S_IFLNK:
424 ip->i_op = &zpl_symlink_inode_operations;
425 break;
426
427 /*
428 * rdev is only stored in a SA only for device files.
429 */
430 case S_IFCHR:
431 case S_IFBLK:
432 (void) sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), &rdev,
433 sizeof (rdev));
434 zfs_fallthrough;
435 case S_IFIFO:
436 case S_IFSOCK:
437 init_special_inode(ip, ip->i_mode, rdev);
438 ip->i_op = &zpl_special_inode_operations;
439 break;
440
441 default:
442 zfs_panic_recover("inode %llu has invalid mode: 0x%x\n",
443 (u_longlong_t)ip->i_ino, ip->i_mode);
444
445 /* Assume the inode is a file and attempt to continue */
446 ip->i_mode = S_IFREG | 0644;
447 ip->i_op = &zpl_inode_operations;
448 ip->i_fop = &zpl_file_operations;
449 ip->i_mapping->a_ops = &zpl_address_space_operations;
450 break;
451 }
452 }
453
454 static void
zfs_set_inode_flags(znode_t * zp,struct inode * ip)455 zfs_set_inode_flags(znode_t *zp, struct inode *ip)
456 {
457 /*
458 * Linux and Solaris have different sets of file attributes, so we
459 * restrict this conversion to the intersection of the two.
460 */
461 unsigned int flags = 0;
462 if (zp->z_pflags & ZFS_IMMUTABLE)
463 flags |= S_IMMUTABLE;
464 if (zp->z_pflags & ZFS_APPENDONLY)
465 flags |= S_APPEND;
466
467 inode_set_flags(ip, flags, S_IMMUTABLE|S_APPEND);
468 }
469
470 /*
471 * Update the embedded inode given the znode.
472 */
473 void
zfs_znode_update_vfs(znode_t * zp)474 zfs_znode_update_vfs(znode_t *zp)
475 {
476 struct inode *ip;
477 uint32_t blksize;
478 u_longlong_t i_blocks;
479
480 ASSERT(zp != NULL);
481 ip = ZTOI(zp);
482
483 /* Skip .zfs control nodes which do not exist on disk. */
484 if (zfsctl_is_node(ip))
485 return;
486
487 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize, &i_blocks);
488
489 spin_lock(&ip->i_lock);
490 ip->i_mode = zp->z_mode;
491 ip->i_blocks = i_blocks;
492 i_size_write(ip, zp->z_size);
493 spin_unlock(&ip->i_lock);
494 }
495
496
497 /*
498 * Construct a znode+inode and initialize.
499 *
500 * This does not do a call to dmu_set_user() that is
501 * up to the caller to do, in case you don't want to
502 * return the znode
503 */
504 static znode_t *
zfs_znode_alloc(zfsvfs_t * zfsvfs,dmu_buf_t * db,int blksz,dmu_object_type_t obj_type,sa_handle_t * hdl)505 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
506 dmu_object_type_t obj_type, sa_handle_t *hdl)
507 {
508 znode_t *zp;
509 struct inode *ip;
510 uint64_t mode;
511 uint64_t parent;
512 uint64_t tmp_gen;
513 uint64_t links;
514 uint64_t z_uid, z_gid;
515 uint64_t atime[2], mtime[2], ctime[2], btime[2];
516 inode_timespec_t tmp_ts;
517 uint64_t projid = ZFS_DEFAULT_PROJID;
518 sa_bulk_attr_t bulk[12];
519 int count = 0;
520
521 ASSERT(zfsvfs != NULL);
522
523 ip = new_inode(zfsvfs->z_sb);
524 if (ip == NULL)
525 return (NULL);
526
527 zp = ITOZ(ip);
528 ASSERT0P(zp->z_dirlocks);
529 ASSERT0P(zp->z_acl_cached);
530 ASSERT0P(zp->z_xattr_cached);
531 zp->z_unlinked = B_FALSE;
532 zp->z_atime_dirty = B_FALSE;
533 zp->z_is_ctldir = B_FALSE;
534 zp->z_suspended = B_FALSE;
535 zp->z_xattr_dir_absent = B_FALSE;
536 zp->z_sa_hdl = NULL;
537 zp->z_mapcnt = 0;
538 zp->z_id = db->db_object;
539 zp->z_blksz = blksz;
540 zp->z_sync_cnt = 0;
541
542 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
543
544 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
545 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &tmp_gen, 8);
546 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
547 &zp->z_size, 8);
548 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
549 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
550 &zp->z_pflags, 8);
551 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
552 &parent, 8);
553 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &z_uid, 8);
554 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &z_gid, 8);
555 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
556 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
557 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
558 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
559
560 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || tmp_gen == 0 ||
561 (dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
562 (zp->z_pflags & ZFS_PROJID) &&
563 sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) {
564 if (hdl == NULL)
565 sa_handle_destroy(zp->z_sa_hdl);
566 zp->z_sa_hdl = NULL;
567 goto error;
568 }
569
570 /*
571 * Restore z_seq from SA_ZPL_SEQ. A successful lookup marks the file as
572 * migrated via the in-core z_has_seq (never persisted, so no pflag bit
573 * is consumed). Absence means the file predates persistence: seed z_seq
574 * above any cookie the pre-persistence code could have presented
575 * ((ctime << 32) | low) so it stays monotonic across the upgrade; the
576 * first modify migrates the file.
577 */
578 if (zp->z_is_sa && sa_lookup(zp->z_sa_hdl, SA_ZPL_SEQ(zfsvfs),
579 &zp->z_seq, sizeof (zp->z_seq)) == 0) {
580 zp->z_has_seq = B_TRUE;
581 } else {
582 zp->z_has_seq = B_FALSE;
583 zp->z_seq = (ctime[0] + 1) << 32;
584 }
585
586 zp->z_projid = projid;
587 zp->z_mode = ip->i_mode = mode;
588 ip->i_generation = (uint32_t)tmp_gen;
589 ip->i_blkbits = SPA_MINBLOCKSHIFT;
590 set_nlink(ip, (uint32_t)links);
591 zfs_uid_write(ip, z_uid);
592 zfs_gid_write(ip, z_gid);
593 zfs_set_inode_flags(zp, ip);
594
595 /* Cache the xattr parent id */
596 if (zp->z_pflags & ZFS_XATTR)
597 zp->z_xattr_parent = parent;
598
599 ZFS_TIME_DECODE(&tmp_ts, atime);
600 zpl_inode_set_atime_to_ts(ip, tmp_ts);
601 ZFS_TIME_DECODE(&tmp_ts, mtime);
602 zpl_inode_set_mtime_to_ts(ip, tmp_ts);
603 ZFS_TIME_DECODE(&tmp_ts, ctime);
604 zpl_inode_set_ctime_to_ts(ip, tmp_ts);
605 ZFS_TIME_DECODE(&zp->z_btime, btime);
606
607 ip->i_ino = zp->z_id;
608 zfs_znode_update_vfs(zp);
609 zfs_inode_set_ops(zfsvfs, ip);
610
611 /*
612 * The only way insert_inode_locked() can fail is if the ip->i_ino
613 * number is already hashed for this super block. This can never
614 * happen because the inode numbers map 1:1 with the object numbers.
615 *
616 * Exceptions include rolling back a mounted file system, either
617 * from the zfs rollback or zfs recv command.
618 *
619 * Active inodes are unhashed during the rollback, but since zrele
620 * can happen asynchronously, we can't guarantee they've been
621 * unhashed. This can cause hash collisions in unlinked drain
622 * processing so do not hash unlinked znodes.
623 */
624 if (links > 0)
625 VERIFY0(insert_inode_locked(ip));
626
627 mutex_enter(&zfsvfs->z_znodes_lock);
628 list_insert_tail(&zfsvfs->z_all_znodes, zp);
629 mutex_exit(&zfsvfs->z_znodes_lock);
630
631 if (links > 0)
632 unlock_new_inode(ip);
633 return (zp);
634
635 error:
636 iput(ip);
637 return (NULL);
638 }
639
640 /*
641 * Safely mark an inode dirty. Inodes which are part of a read-only
642 * file system or snapshot may not be dirtied.
643 */
644 void
zfs_mark_inode_dirty(struct inode * ip)645 zfs_mark_inode_dirty(struct inode *ip)
646 {
647 zfsvfs_t *zfsvfs = ITOZSB(ip);
648
649 if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os))
650 return;
651
652 mark_inode_dirty(ip);
653 }
654
655 static uint64_t empty_xattr;
656 static uint64_t pad[4];
657 static zfs_acl_phys_t acl_phys;
658 /*
659 * Create a new DMU object to hold a zfs znode.
660 *
661 * IN: dzp - parent directory for new znode
662 * vap - file attributes for new znode
663 * tx - dmu transaction id for zap operations
664 * cr - credentials of caller
665 * flag - flags:
666 * IS_ROOT_NODE - new object will be root
667 * IS_TMPFILE - new object is of O_TMPFILE
668 * IS_XATTR - new object is an attribute
669 * acl_ids - ACL related attributes
670 *
671 * OUT: zpp - allocated znode (set to dzp if IS_ROOT_NODE)
672 *
673 */
674 void
zfs_mknode(znode_t * dzp,vattr_t * vap,dmu_tx_t * tx,cred_t * cr,uint_t flag,znode_t ** zpp,zfs_acl_ids_t * acl_ids)675 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
676 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
677 {
678 uint64_t crtime[2], atime[2], mtime[2], ctime[2];
679 uint64_t mode, size, links, parent, pflags;
680 uint64_t projid = ZFS_DEFAULT_PROJID;
681 uint64_t rdev = 0;
682 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
683 dmu_buf_t *db;
684 inode_timespec_t now;
685 uint64_t gen, obj;
686 int bonuslen;
687 int dnodesize;
688 sa_handle_t *sa_hdl;
689 dmu_object_type_t obj_type;
690 sa_bulk_attr_t *sa_attrs;
691 int cnt = 0;
692 zfs_acl_locator_cb_t locate = { 0 };
693 znode_hold_t *zh;
694
695 if (zfsvfs->z_replay) {
696 obj = vap->va_nodeid;
697 now = vap->va_ctime; /* see zfs_replay_create() */
698 gen = vap->va_nblocks; /* ditto */
699 dnodesize = vap->va_fsid; /* ditto */
700 } else {
701 obj = 0;
702 gethrestime(&now);
703 gen = dmu_tx_get_txg(tx);
704 dnodesize = dmu_objset_dnodesize(zfsvfs->z_os);
705 }
706
707 if (dnodesize == 0)
708 dnodesize = DNODE_MIN_SIZE;
709
710 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
711
712 bonuslen = (obj_type == DMU_OT_SA) ?
713 DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE;
714
715 /*
716 * Create a new DMU object.
717 */
718 /*
719 * There's currently no mechanism for pre-reading the blocks that will
720 * be needed to allocate a new object, so we accept the small chance
721 * that there will be an i/o error and we will fail one of the
722 * assertions below.
723 */
724 if (S_ISDIR(vap->va_mode)) {
725 if (zfsvfs->z_replay) {
726 VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj,
727 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
728 obj_type, bonuslen, dnodesize, tx));
729 } else {
730 obj = zap_create_norm_dnsize(zfsvfs->z_os,
731 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
732 obj_type, bonuslen, dnodesize, tx);
733 }
734 } else {
735 if (zfsvfs->z_replay) {
736 VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj,
737 DMU_OT_PLAIN_FILE_CONTENTS, 0,
738 obj_type, bonuslen, dnodesize, tx));
739 } else {
740 obj = dmu_object_alloc_dnsize(zfsvfs->z_os,
741 DMU_OT_PLAIN_FILE_CONTENTS, 0,
742 obj_type, bonuslen, dnodesize, tx);
743 }
744 }
745
746 zh = zfs_znode_hold_enter(zfsvfs, obj);
747 VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
748
749 /*
750 * If this is the root, fix up the half-initialized parent pointer
751 * to reference the just-allocated physical data area.
752 */
753 if (flag & IS_ROOT_NODE) {
754 dzp->z_id = obj;
755 }
756
757 /*
758 * If parent is an xattr, so am I.
759 */
760 if (dzp->z_pflags & ZFS_XATTR) {
761 flag |= IS_XATTR;
762 }
763
764 if (zfsvfs->z_use_fuids)
765 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
766 else
767 pflags = 0;
768
769 if (S_ISDIR(vap->va_mode)) {
770 size = 2; /* contents ("." and "..") */
771 links = 2;
772 } else {
773 size = 0;
774 links = (flag & IS_TMPFILE) ? 0 : 1;
775 }
776
777 if (S_ISBLK(vap->va_mode) || S_ISCHR(vap->va_mode))
778 rdev = vap->va_rdev;
779
780 parent = dzp->z_id;
781 mode = acl_ids->z_mode;
782 if (flag & IS_XATTR)
783 pflags |= ZFS_XATTR;
784
785 /*
786 * With ZFS_PROJID flag, we can easily know whether there is
787 * project ID stored on disk or not. See zpl_get_file_info().
788 */
789 if (obj_type != DMU_OT_ZNODE &&
790 dmu_objset_projectquota_enabled(zfsvfs->z_os))
791 pflags |= ZFS_PROJID;
792
793 /*
794 * Inherit project ID from parent if required. Every object type
795 * takes part, as ext4 and XFS do: an object that carried no project
796 * ID of its own would be treated as belonging to a different project
797 * than the directory holding it, so zfs_rename() and zfs_link()
798 * would refuse it with EXDEV even within its own project.
799 *
800 * The ZFS_PROJINHERIT flag itself keeps passing to regular files and
801 * directories only, as before, so that lsattr(1) output is unchanged.
802 */
803 projid = zfs_inherit_projid(dzp);
804 if ((S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode)) &&
805 (dzp->z_pflags & ZFS_PROJINHERIT))
806 pflags |= ZFS_PROJINHERIT;
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 VERIFY0(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 VERIFY0(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx));
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
zfs_xvattr_set(znode_t * zp,xvattr_t * xvap,dmu_tx_t * tx)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 ×, 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
zfs_zget(zfsvfs_t * zfsvfs,uint64_t obj_num,znode_t ** zpp)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
zfs_rezget(znode_t * zp)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 inode_timespec_t tmp_ts;
1191 uint64_t projid = ZFS_DEFAULT_PROJID;
1192 znode_hold_t *zh;
1193
1194 /*
1195 * skip ctldir, otherwise they will always get invalidated. This will
1196 * cause funny behaviour for the mounted snapdirs. Especially for
1197 * Linux >= 3.18, d_invalidate will detach the mountpoint and prevent
1198 * anyone automount it again as long as someone is still using the
1199 * detached mount.
1200 */
1201 if (zp->z_is_ctldir)
1202 return (0);
1203
1204 /*
1205 * Drop cached pages before reloading the znode. After a rollback or
1206 * a forced receive the object may hold different data under the same
1207 * inode, size and generation; stale Uptodate pages would otherwise be
1208 * served by mappedread() and mmap() (see #10931). FreeBSD does the
1209 * same here via vn_pages_remove().
1210 */
1211 truncate_inode_pages(ZTOI(zp)->i_mapping, 0);
1212
1213 zh = zfs_znode_hold_enter(zfsvfs, obj_num);
1214
1215 mutex_enter(&zp->z_acl_lock);
1216 if (zp->z_acl_cached) {
1217 zfs_acl_free(zp->z_acl_cached);
1218 zp->z_acl_cached = NULL;
1219 }
1220 mutex_exit(&zp->z_acl_lock);
1221
1222 #ifdef CONFIG_FS_POSIX_ACL
1223 /* The VFS cache can still describe the pre-rollback inode. */
1224 forget_cached_acl(ZTOI(zp), ACL_TYPE_ACCESS);
1225 forget_cached_acl(ZTOI(zp), ACL_TYPE_DEFAULT);
1226 #endif
1227
1228 rw_enter(&zp->z_xattr_lock, RW_WRITER);
1229 if (zp->z_xattr_cached) {
1230 nvlist_free(zp->z_xattr_cached);
1231 zp->z_xattr_cached = NULL;
1232 }
1233 rw_exit(&zp->z_xattr_lock);
1234
1235 zp->z_xattr_dir_absent = B_FALSE;
1236
1237 ASSERT0P(zp->z_sa_hdl);
1238 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
1239 if (err) {
1240 zfs_znode_hold_exit(zfsvfs, zh);
1241 return (err);
1242 }
1243
1244 dmu_object_info_from_db(db, &doi);
1245 if (doi.doi_bonus_type != DMU_OT_SA &&
1246 (doi.doi_bonus_type != DMU_OT_ZNODE ||
1247 (doi.doi_bonus_type == DMU_OT_ZNODE &&
1248 doi.doi_bonus_size < sizeof (znode_phys_t)))) {
1249 sa_buf_rele(db, NULL);
1250 zfs_znode_hold_exit(zfsvfs, zh);
1251 return (SET_ERROR(EINVAL));
1252 }
1253
1254 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
1255
1256 /* reload cached values */
1257 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
1258 &gen, sizeof (gen));
1259 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
1260 &zp->z_size, sizeof (zp->z_size));
1261 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
1262 &links, sizeof (links));
1263 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1264 &zp->z_pflags, sizeof (zp->z_pflags));
1265 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
1266 &z_uid, sizeof (z_uid));
1267 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
1268 &z_gid, sizeof (z_gid));
1269 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1270 &mode, sizeof (mode));
1271 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
1272 &atime, 16);
1273 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
1274 &mtime, 16);
1275 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
1276 &ctime, 16);
1277 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);
1278
1279 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
1280 zfs_znode_dmu_fini(zp);
1281 zfs_znode_hold_exit(zfsvfs, zh);
1282 return (SET_ERROR(EIO));
1283 }
1284
1285 if (dmu_objset_projectquota_enabled(zfsvfs->z_os)) {
1286 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs),
1287 &projid, 8);
1288 if (err != 0 && err != ENOENT) {
1289 zfs_znode_dmu_fini(zp);
1290 zfs_znode_hold_exit(zfsvfs, zh);
1291 return (SET_ERROR(err));
1292 }
1293 }
1294
1295 zp->z_projid = projid;
1296
1297 /*
1298 * Reload z_has_seq and z_seq from disk so stale in-core state from
1299 * before rollback/recv does not survive. A stale TRUE marker would
1300 * make ZFS_SEQ_MAY_GROW() skip the grow reservation while SA_ZPL_SEQ
1301 * is gone on disk.
1302 */
1303 zp->z_has_seq = (zp->z_is_sa &&
1304 sa_lookup(zp->z_sa_hdl, SA_ZPL_SEQ(zfsvfs),
1305 &zp->z_seq, sizeof (zp->z_seq)) == 0);
1306
1307 zp->z_mode = ZTOI(zp)->i_mode = mode;
1308 zfs_uid_write(ZTOI(zp), z_uid);
1309 zfs_gid_write(ZTOI(zp), z_gid);
1310
1311 ZFS_TIME_DECODE(&tmp_ts, atime);
1312 zpl_inode_set_atime_to_ts(ZTOI(zp), tmp_ts);
1313 ZFS_TIME_DECODE(&tmp_ts, mtime);
1314 zpl_inode_set_mtime_to_ts(ZTOI(zp), tmp_ts);
1315 ZFS_TIME_DECODE(&tmp_ts, ctime);
1316 zpl_inode_set_ctime_to_ts(ZTOI(zp), tmp_ts);
1317 ZFS_TIME_DECODE(&zp->z_btime, btime);
1318
1319 if ((uint32_t)gen != ZTOI(zp)->i_generation) {
1320 zfs_znode_dmu_fini(zp);
1321 zfs_znode_hold_exit(zfsvfs, zh);
1322 return (SET_ERROR(EIO));
1323 }
1324
1325 set_nlink(ZTOI(zp), (uint32_t)links);
1326 zfs_set_inode_flags(zp, ZTOI(zp));
1327
1328 zp->z_blksz = doi.doi_data_block_size;
1329 zp->z_atime_dirty = B_FALSE;
1330 zfs_znode_update_vfs(zp);
1331
1332 /*
1333 * If the file has zero links, then it has been unlinked on the send
1334 * side and it must be in the received unlinked set.
1335 * We call zfs_znode_dmu_fini() now to prevent any accesses to the
1336 * stale data and to prevent automatic removal of the file in
1337 * zfs_zinactive(). The file will be removed either when it is removed
1338 * on the send side and the next incremental stream is received or
1339 * when the unlinked set gets processed.
1340 */
1341 zp->z_unlinked = (ZTOI(zp)->i_nlink == 0);
1342 if (zp->z_unlinked)
1343 zfs_znode_dmu_fini(zp);
1344
1345 zfs_znode_hold_exit(zfsvfs, zh);
1346
1347 return (0);
1348 }
1349
1350 void
zfs_znode_delete(znode_t * zp,dmu_tx_t * tx)1351 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
1352 {
1353 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1354 objset_t *os = zfsvfs->z_os;
1355 uint64_t obj = zp->z_id;
1356 uint64_t acl_obj = zfs_external_acl(zp);
1357 znode_hold_t *zh;
1358
1359 zh = zfs_znode_hold_enter(zfsvfs, obj);
1360 if (acl_obj) {
1361 VERIFY(!zp->z_is_sa);
1362 VERIFY0(dmu_object_free(os, acl_obj, tx));
1363 }
1364 VERIFY0(dmu_object_free(os, obj, tx));
1365 zfs_znode_dmu_fini(zp);
1366 zfs_znode_hold_exit(zfsvfs, zh);
1367 }
1368
1369 void
zfs_zinactive(znode_t * zp)1370 zfs_zinactive(znode_t *zp)
1371 {
1372 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1373 uint64_t z_id = zp->z_id;
1374 znode_hold_t *zh;
1375
1376 ASSERT(zp->z_sa_hdl);
1377
1378 /*
1379 * Don't allow a zfs_zget() while were trying to release this znode.
1380 */
1381 zh = zfs_znode_hold_enter(zfsvfs, z_id);
1382
1383 mutex_enter(&zp->z_lock);
1384
1385 /*
1386 * If this was the last reference to a file with no links, remove
1387 * the file from the file system unless the file system is mounted
1388 * read-only. That can happen, for example, if the file system was
1389 * originally read-write, the file was opened, then unlinked and
1390 * the file system was made read-only before the file was finally
1391 * closed. The file will remain in the unlinked set.
1392 */
1393 if (zp->z_unlinked) {
1394 ASSERT(!zfsvfs->z_issnap);
1395 if (!zfs_is_readonly(zfsvfs) && !zfs_unlink_suspend_progress) {
1396 mutex_exit(&zp->z_lock);
1397 zfs_znode_hold_exit(zfsvfs, zh);
1398 zfs_rmnode(zp);
1399 return;
1400 }
1401 }
1402
1403 mutex_exit(&zp->z_lock);
1404 zfs_znode_dmu_fini(zp);
1405
1406 zfs_znode_hold_exit(zfsvfs, zh);
1407 }
1408
1409 /*
1410 * Determine whether the znode's atime must be updated. The logic mostly
1411 * duplicates the Linux kernel's relatime_need_update() functionality.
1412 * This function is only called if the underlying filesystem actually has
1413 * atime updates enabled.
1414 */
1415 boolean_t
zfs_relatime_need_update(const struct inode * ip)1416 zfs_relatime_need_update(const struct inode *ip)
1417 {
1418 inode_timespec_t now, tmp_atime, tmp_ts;
1419
1420 gethrestime(&now);
1421 tmp_atime = zpl_inode_get_atime(ip);
1422 /*
1423 * In relatime mode, only update the atime if the previous atime
1424 * is earlier than either the ctime or mtime or if at least a day
1425 * has passed since the last update of atime.
1426 */
1427 tmp_ts = zpl_inode_get_mtime(ip);
1428 if (timespec64_compare(&tmp_ts, &tmp_atime) >= 0)
1429 return (B_TRUE);
1430
1431 tmp_ts = zpl_inode_get_ctime(ip);
1432 if (timespec64_compare(&tmp_ts, &tmp_atime) >= 0)
1433 return (B_TRUE);
1434
1435 if ((hrtime_t)now.tv_sec - (hrtime_t)tmp_atime.tv_sec >= 24*60*60)
1436 return (B_TRUE);
1437
1438 return (B_FALSE);
1439 }
1440
1441 /*
1442 * Prepare to update znode time stamps.
1443 *
1444 * IN: zp - znode requiring timestamp update
1445 * flag - ATTR_MTIME, ATTR_CTIME flags
1446 *
1447 * OUT: zp - z_seq
1448 * mtime - new mtime
1449 * ctime - new ctime
1450 *
1451 * Note: We don't update atime here, because we rely on Linux VFS to do
1452 * atime updating.
1453 */
1454 void
zfs_tstamp_update_setup(znode_t * zp,uint_t flag,uint64_t mtime[2],uint64_t ctime[2])1455 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
1456 uint64_t ctime[2])
1457 {
1458 inode_timespec_t now, tmp_ts;
1459
1460 gethrestime(&now);
1461
1462 atomic_inc_64(&zp->z_seq);
1463
1464 if (flag & ATTR_MTIME) {
1465 ZFS_TIME_ENCODE(&now, mtime);
1466 ZFS_TIME_DECODE(&tmp_ts, mtime);
1467 zpl_inode_set_mtime_to_ts(ZTOI(zp), tmp_ts);
1468 if (ZTOZSB(zp)->z_use_fuids) {
1469 zp->z_pflags |= (ZFS_ARCHIVE |
1470 ZFS_AV_MODIFIED);
1471 }
1472 }
1473
1474 if (flag & ATTR_CTIME) {
1475 ZFS_TIME_ENCODE(&now, ctime);
1476 ZFS_TIME_DECODE(&tmp_ts, ctime);
1477 zpl_inode_set_ctime_to_ts(ZTOI(zp), tmp_ts);
1478 if (ZTOZSB(zp)->z_use_fuids)
1479 zp->z_pflags |= ZFS_ARCHIVE;
1480 }
1481 }
1482
1483 /*
1484 * Grow the block size for a file.
1485 *
1486 * IN: zp - znode of file to free data in.
1487 * size - requested block size
1488 * tx - open transaction.
1489 *
1490 * NOTE: this function assumes that the znode is write locked.
1491 */
1492 void
zfs_grow_blocksize(znode_t * zp,uint64_t size,dmu_tx_t * tx)1493 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
1494 {
1495 int error;
1496 u_longlong_t dummy;
1497
1498 if (size <= zp->z_blksz)
1499 return;
1500 /*
1501 * If the file size is already greater than the current blocksize,
1502 * we will not grow. If there is more than one block in a file,
1503 * the blocksize cannot change.
1504 */
1505 if (zp->z_blksz && zp->z_size > zp->z_blksz)
1506 return;
1507
1508 error = dmu_object_set_blocksize(ZTOZSB(zp)->z_os, zp->z_id,
1509 size, 0, tx);
1510
1511 if (error == ENOTSUP)
1512 return;
1513 ASSERT0(error);
1514
1515 /* What blocksize did we actually get? */
1516 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
1517 }
1518
1519 /*
1520 * Increase the file length
1521 *
1522 * IN: zp - znode of file to free data in.
1523 * end - new end-of-file
1524 *
1525 * RETURN: 0 on success, error code on failure
1526 */
1527 static int
zfs_extend(znode_t * zp,uint64_t end)1528 zfs_extend(znode_t *zp, uint64_t end)
1529 {
1530 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1531 dmu_tx_t *tx;
1532 zfs_locked_range_t *lr;
1533 uint64_t newblksz;
1534 int error;
1535
1536 /*
1537 * We will change zp_size, lock the whole file.
1538 */
1539 lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
1540
1541 /*
1542 * Nothing to do if file already at desired length.
1543 */
1544 if (end <= zp->z_size) {
1545 zfs_rangelock_exit(lr);
1546 return (0);
1547 }
1548 tx = dmu_tx_create(zfsvfs->z_os);
1549 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1550 zfs_sa_upgrade_txholds(tx, zp);
1551 if (end > zp->z_blksz &&
1552 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
1553 /*
1554 * We are growing the file past the current block size.
1555 */
1556 if (zp->z_blksz > ZTOZSB(zp)->z_max_blksz) {
1557 /*
1558 * File's blocksize is already larger than the
1559 * "recordsize" property. Only let it grow to
1560 * the next power of 2.
1561 */
1562 ASSERT(!ISP2(zp->z_blksz));
1563 newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
1564 } else {
1565 newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz);
1566 }
1567 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
1568 } else {
1569 newblksz = 0;
1570 }
1571
1572 error = dmu_tx_assign(tx, DMU_TX_WAIT);
1573 if (error) {
1574 dmu_tx_abort(tx);
1575 zfs_rangelock_exit(lr);
1576 return (error);
1577 }
1578
1579 if (newblksz)
1580 zfs_grow_blocksize(zp, newblksz, tx);
1581
1582 zp->z_size = end;
1583
1584 VERIFY0(sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)),
1585 &zp->z_size, sizeof (zp->z_size), tx));
1586
1587 zfs_rangelock_exit(lr);
1588
1589 dmu_tx_commit(tx);
1590
1591 return (0);
1592 }
1593
1594 /*
1595 * zfs_zero_partial_page - Modeled after update_pages() but
1596 * with different arguments and semantics for use by zfs_freesp().
1597 *
1598 * Zeroes a piece of a single page cache entry for zp at offset
1599 * start and length len.
1600 *
1601 * Caller must acquire a range lock on the file for the region
1602 * being zeroed in order that the ARC and page cache stay in sync.
1603 */
1604 static void
zfs_zero_partial_page(znode_t * zp,uint64_t start,uint64_t len)1605 zfs_zero_partial_page(znode_t *zp, uint64_t start, uint64_t len)
1606 {
1607 struct address_space *mp = ZTOI(zp)->i_mapping;
1608 struct page *pp;
1609 int64_t off;
1610 void *pb;
1611
1612 ASSERT((start & PAGE_MASK) == ((start + len - 1) & PAGE_MASK));
1613
1614 off = start & (PAGE_SIZE - 1);
1615 start &= PAGE_MASK;
1616
1617 pp = find_lock_page(mp, start >> PAGE_SHIFT);
1618 if (pp) {
1619 if (mapping_writably_mapped(mp))
1620 flush_dcache_page(pp);
1621
1622 pb = kmap(pp);
1623 memset(pb + off, 0, len);
1624 kunmap(pp);
1625
1626 if (mapping_writably_mapped(mp))
1627 flush_dcache_page(pp);
1628
1629 mark_page_accessed(pp);
1630 SetPageUptodate(pp);
1631 ClearPageError(pp);
1632 unlock_page(pp);
1633 put_page(pp);
1634 }
1635 }
1636
1637 /*
1638 * Free space in a file.
1639 *
1640 * IN: zp - znode of file to free data in.
1641 * off - start of section to free.
1642 * len - length of section to free.
1643 *
1644 * RETURN: 0 on success, error code on failure
1645 */
1646 static int
zfs_free_range(znode_t * zp,uint64_t off,uint64_t len)1647 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
1648 {
1649 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1650 zfs_locked_range_t *lr;
1651 int error;
1652
1653 /*
1654 * Lock the range being freed.
1655 */
1656 lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER);
1657
1658 /*
1659 * Nothing to do if file already at desired length.
1660 */
1661 if (off >= zp->z_size) {
1662 zfs_rangelock_exit(lr);
1663 return (0);
1664 }
1665
1666 if (off + len > zp->z_size)
1667 len = zp->z_size - off;
1668
1669 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
1670
1671 /*
1672 * Zero partial page cache entries. This must be done under a
1673 * range lock in order to keep the ARC and page cache in sync.
1674 */
1675 if (zn_has_cached_data(zp, off, off + len - 1)) {
1676 loff_t first_page, last_page, page_len;
1677 loff_t first_page_offset, last_page_offset;
1678
1679 /* first possible full page in hole */
1680 first_page = (off + PAGE_SIZE - 1) >> PAGE_SHIFT;
1681 /* last page of hole */
1682 last_page = (off + len) >> PAGE_SHIFT;
1683
1684 /* offset of first_page */
1685 first_page_offset = first_page << PAGE_SHIFT;
1686 /* offset of last_page */
1687 last_page_offset = last_page << PAGE_SHIFT;
1688
1689 /* truncate whole pages */
1690 if (last_page_offset > first_page_offset) {
1691 truncate_inode_pages_range(ZTOI(zp)->i_mapping,
1692 first_page_offset, last_page_offset - 1);
1693 }
1694
1695 /* truncate sub-page ranges */
1696 if (first_page > last_page) {
1697 /* entire punched area within a single page */
1698 zfs_zero_partial_page(zp, off, len);
1699 } else {
1700 /* beginning of punched area at the end of a page */
1701 page_len = first_page_offset - off;
1702 if (page_len > 0)
1703 zfs_zero_partial_page(zp, off, page_len);
1704
1705 /* end of punched area at the beginning of a page */
1706 page_len = off + len - last_page_offset;
1707 if (page_len > 0)
1708 zfs_zero_partial_page(zp, last_page_offset,
1709 page_len);
1710 }
1711 }
1712 zfs_rangelock_exit(lr);
1713
1714 return (error);
1715 }
1716
1717 /*
1718 * Truncate a file
1719 *
1720 * IN: zp - znode of file to free data in.
1721 * end - new end-of-file.
1722 *
1723 * RETURN: 0 on success, error code on failure
1724 */
1725 static int
zfs_trunc(znode_t * zp,uint64_t end)1726 zfs_trunc(znode_t *zp, uint64_t end)
1727 {
1728 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1729 dmu_tx_t *tx;
1730 zfs_locked_range_t *lr;
1731 int error;
1732 sa_bulk_attr_t bulk[2];
1733 int count = 0;
1734
1735 /*
1736 * We will change zp_size, lock the whole file.
1737 */
1738 lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
1739
1740 /*
1741 * Nothing to do if file already at desired length.
1742 */
1743 if (end >= zp->z_size) {
1744 zfs_rangelock_exit(lr);
1745 return (0);
1746 }
1747
1748 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
1749 DMU_OBJECT_END);
1750 if (error) {
1751 zfs_rangelock_exit(lr);
1752 return (error);
1753 }
1754 tx = dmu_tx_create(zfsvfs->z_os);
1755 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1756 zfs_sa_upgrade_txholds(tx, zp);
1757 dmu_tx_mark_netfree(tx);
1758 error = dmu_tx_assign(tx, DMU_TX_WAIT);
1759 if (error) {
1760 dmu_tx_abort(tx);
1761 zfs_rangelock_exit(lr);
1762 return (error);
1763 }
1764
1765 zp->z_size = end;
1766 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
1767 NULL, &zp->z_size, sizeof (zp->z_size));
1768
1769 if (end == 0) {
1770 zp->z_pflags &= ~ZFS_SPARSE;
1771 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1772 NULL, &zp->z_pflags, 8);
1773 }
1774 VERIFY0(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1775
1776 dmu_tx_commit(tx);
1777 zfs_rangelock_exit(lr);
1778
1779 return (0);
1780 }
1781
1782 /*
1783 * Free space in a file
1784 *
1785 * IN: zp - znode of file to free data in.
1786 * off - start of range
1787 * len - end of range (0 => EOF)
1788 * flag - current file open mode flags.
1789 * log - TRUE if this action should be logged
1790 *
1791 * RETURN: 0 on success, error code on failure
1792 */
1793 int
zfs_freesp(znode_t * zp,uint64_t off,uint64_t len,int flag,boolean_t log)1794 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
1795 {
1796 dmu_tx_t *tx;
1797 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1798 zilog_t *zilog = zfsvfs->z_log;
1799 uint64_t mode;
1800 uint64_t mtime[2], ctime[2];
1801 sa_bulk_attr_t bulk[4];
1802 int count = 0;
1803 int error;
1804
1805 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
1806 sizeof (mode))) != 0)
1807 return (error);
1808
1809 if (off > zp->z_size) {
1810 error = zfs_extend(zp, off+len);
1811 if (error == 0 && log)
1812 goto log;
1813 goto out;
1814 }
1815
1816 if (len == 0) {
1817 error = zfs_trunc(zp, off);
1818 } else {
1819 if ((error = zfs_free_range(zp, off, len)) == 0 &&
1820 off + len > zp->z_size)
1821 error = zfs_extend(zp, off+len);
1822 }
1823 if (error || !log)
1824 goto out;
1825 log:
1826 tx = dmu_tx_create(zfsvfs->z_os);
1827 dmu_tx_hold_sa(tx, zp->z_sa_hdl, ZFS_SEQ_MAY_GROW(zp));
1828 zfs_sa_upgrade_txholds(tx, zp);
1829 error = dmu_tx_assign(tx, DMU_TX_WAIT);
1830 if (error) {
1831 dmu_tx_abort(tx);
1832 goto out;
1833 }
1834
1835 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
1836 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
1837 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
1838 NULL, &zp->z_pflags, 8);
1839 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
1840 ZFS_PERSIST_SEQ(zp, bulk, count);
1841 ASSERT3S(count, <=, ARRAY_SIZE(bulk));
1842 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
1843 ASSERT0(error);
1844
1845 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
1846
1847 dmu_tx_commit(tx);
1848
1849 zfs_znode_update_vfs(zp);
1850 error = 0;
1851
1852 out:
1853 /*
1854 * Truncate the page cache - for file truncate operations, use
1855 * the purpose-built API for truncations. For punching operations,
1856 * the truncation is handled under a range lock in zfs_free_range.
1857 */
1858 if (len == 0)
1859 truncate_setsize(ZTOI(zp), off);
1860 return (error);
1861 }
1862
1863 void
zfs_create_fs(objset_t * os,cred_t * cr,nvlist_t * zplprops,dmu_tx_t * tx)1864 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
1865 {
1866 struct super_block *sb;
1867 zfsvfs_t *zfsvfs;
1868 uint64_t moid, obj, sa_obj, version;
1869 uint64_t sense = ZFS_CASE_SENSITIVE;
1870 uint64_t norm = 0;
1871 nvpair_t *elem;
1872 int size;
1873 int error;
1874 int i;
1875 znode_t *rootzp = NULL;
1876 vattr_t vattr;
1877 znode_t *zp;
1878 zfs_acl_ids_t acl_ids;
1879
1880 /*
1881 * First attempt to create master node.
1882 */
1883 /*
1884 * In an empty objset, there are no blocks to read and thus
1885 * there can be no i/o errors (which we assert below).
1886 */
1887 moid = MASTER_NODE_OBJ;
1888 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1889 DMU_OT_NONE, 0, tx);
1890 ASSERT0(error);
1891
1892 /*
1893 * Set starting attributes.
1894 */
1895 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
1896 elem = NULL;
1897 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
1898 /* For the moment we expect all zpl props to be uint64_ts */
1899 uint64_t val;
1900 const char *name;
1901
1902 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
1903 VERIFY0(nvpair_value_uint64(elem, &val));
1904 name = nvpair_name(elem);
1905 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
1906 if (val < version)
1907 version = val;
1908 } else {
1909 error = zap_update(os, moid, name, 8, 1, &val, tx);
1910 }
1911 ASSERT0(error);
1912 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
1913 norm = val;
1914 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
1915 sense = val;
1916 }
1917 ASSERT(version != 0);
1918 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
1919 ASSERT0(error);
1920
1921 /*
1922 * Create zap object used for SA attribute registration
1923 */
1924
1925 if (version >= ZPL_VERSION_SA) {
1926 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1927 DMU_OT_NONE, 0, tx);
1928 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1929 ASSERT0(error);
1930 } else {
1931 sa_obj = 0;
1932 }
1933 /*
1934 * Create a delete queue.
1935 */
1936 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1937
1938 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
1939 ASSERT0(error);
1940
1941 /*
1942 * Create root znode. Create minimal znode/inode/zfsvfs/sb
1943 * to allow zfs_mknode to work.
1944 */
1945 vattr.va_mask = ATTR_MODE|ATTR_UID|ATTR_GID;
1946 vattr.va_mode = S_IFDIR|0755;
1947 vattr.va_uid = crgetuid(cr);
1948 vattr.va_gid = crgetgid(cr);
1949
1950 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1951 rootzp->z_unlinked = B_FALSE;
1952 rootzp->z_atime_dirty = B_FALSE;
1953 rootzp->z_xattr_dir_absent = B_FALSE;
1954 rootzp->z_is_sa = USE_SA(version, os);
1955 rootzp->z_pflags = 0;
1956
1957 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1958 zfsvfs->z_os = os;
1959 zfsvfs->z_parent = zfsvfs;
1960 zfsvfs->z_version = version;
1961 zfsvfs->z_use_fuids = USE_FUIDS(version, os);
1962 zfsvfs->z_use_sa = USE_SA(version, os);
1963 zfsvfs->z_norm = norm;
1964
1965 sb = kmem_zalloc(sizeof (struct super_block), KM_SLEEP);
1966 sb->s_fs_info = zfsvfs;
1967
1968 ZTOI(rootzp)->i_sb = sb;
1969
1970 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
1971 &zfsvfs->z_attr_table);
1972
1973 ASSERT0(error);
1974
1975 /*
1976 * Fold case on file systems that are always or sometimes case
1977 * insensitive.
1978 */
1979 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
1980 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
1981
1982 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1983 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1984 offsetof(znode_t, z_link_node));
1985
1986 size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX);
1987 zfsvfs->z_hold_size = size;
1988 zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size,
1989 KM_SLEEP);
1990 zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP);
1991 for (i = 0; i != size; i++) {
1992 avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare,
1993 sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node));
1994 mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL);
1995 }
1996
1997 VERIFY0(zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
1998 cr, NULL, &acl_ids, zfs_init_idmap));
1999 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
2000 ASSERT3P(zp, ==, rootzp);
2001 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
2002 ASSERT0(error);
2003 zfs_acl_ids_free(&acl_ids);
2004
2005 atomic_set(&ZTOI(rootzp)->i_count, 0);
2006 sa_handle_destroy(rootzp->z_sa_hdl);
2007 kmem_cache_free(znode_cache, rootzp);
2008
2009 for (i = 0; i != size; i++) {
2010 avl_destroy(&zfsvfs->z_hold_trees[i]);
2011 mutex_destroy(&zfsvfs->z_hold_locks[i]);
2012 }
2013
2014 mutex_destroy(&zfsvfs->z_znodes_lock);
2015
2016 vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size);
2017 vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size);
2018 kmem_free(sb, sizeof (struct super_block));
2019 kmem_free(zfsvfs, sizeof (zfsvfs_t));
2020 }
2021
2022 EXPORT_SYMBOL(zfs_create_fs);
2023 EXPORT_SYMBOL(zfs_obj_to_path);
2024
2025 module_param(zfs_object_mutex_size, uint, 0644);
2026 MODULE_PARM_DESC(zfs_object_mutex_size, "Size of znode hold array");
2027 module_param(zfs_unlink_suspend_progress, int, 0644);
2028 MODULE_PARM_DESC(zfs_unlink_suspend_progress, "Set to prevent async unlinks "
2029 "(debug - leaks space into the unlinked set)");
2030