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.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
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]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
29 #include <sys/types.h>
30 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/sysmacros.h>
34 #include <sys/resource.h>
35 #include <sys/mntent.h>
37 #include <sys/vnode.h>
40 #include <sys/cmn_err.h>
41 #include <sys/errno.h>
42 #include <sys/unistd.h>
43 #include <sys/atomic.h>
44 #include <sys/zfs_dir.h>
45 #include <sys/zfs_acl.h>
46 #include <sys/zfs_ioctl.h>
47 #include <sys/zfs_rlock.h>
48 #include <sys/fs/zfs.h>
52 #include <sys/refcount.h>
55 #include <sys/zfs_znode.h>
56 #include <sys/refcount.h>
59 * Functions needed for userland (ie: libzpool) are not put under
60 * #ifdef_KERNEL; the rest of the functions have dependencies
61 * (such as VFS logic) that will not compile easily in userland.
64 struct kmem_cache *znode_cache = NULL;
68 znode_pageout_func(dmu_buf_t *dbuf, void *user_ptr)
70 znode_t *zp = user_ptr;
73 mutex_enter(&zp->z_lock);
76 mutex_exit(&zp->z_lock);
78 } else if (vp->v_count == 0) {
81 mutex_exit(&zp->z_lock);
82 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
83 vrecycle(vp, curthread);
84 VOP_UNLOCK(vp, 0, curthread);
88 /* signal force unmount that this znode can be freed */
90 mutex_exit(&zp->z_lock);
94 extern struct vop_vector zfs_vnodeops;
95 extern struct vop_vector zfs_fifoops;
98 * XXX: We cannot use this function as a cache constructor, because
99 * there is one global cache for all file systems and we need
100 * to pass vfsp here, which is not possible, because argument
101 * 'cdrarg' is defined at kmem_cache_create() time.
104 zfs_znode_cache_constructor(void *buf, void *cdrarg, int kmflags)
107 vfs_t *vfsp = cdrarg;
110 if (cdrarg != NULL) {
111 error = getnewvnode("zfs", vfsp, &zfs_vnodeops, &zp->z_vnode);
113 zp->z_vnode->v_data = (caddr_t)zp;
118 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
119 rw_init(&zp->z_map_lock, NULL, RW_DEFAULT, NULL);
120 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
121 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
122 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
124 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
125 avl_create(&zp->z_range_avl, zfs_range_compare,
126 sizeof (rl_t), offsetof(rl_t, r_node));
136 zfs_znode_cache_destructor(void *buf, void *cdarg)
140 ASSERT(zp->z_dirlocks == 0);
141 mutex_destroy(&zp->z_lock);
142 rw_destroy(&zp->z_map_lock);
143 rw_destroy(&zp->z_parent_lock);
144 rw_destroy(&zp->z_name_lock);
145 mutex_destroy(&zp->z_acl_lock);
146 mutex_destroy(&zp->z_range_lock);
147 avl_destroy(&zp->z_range_avl);
149 ASSERT(zp->z_dbuf_held == 0);
158 ASSERT(znode_cache == NULL);
159 znode_cache = kmem_cache_create("zfs_znode_cache",
160 sizeof (znode_t), 0, /* zfs_znode_cache_constructor */ NULL,
161 zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
171 kmem_cache_destroy(znode_cache);
176 * zfs_init_fs - Initialize the zfsvfs struct and the file system
177 * incore "master" object. Verify version compatibility.
180 zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp, cred_t *cr)
182 objset_t *os = zfsvfs->z_os;
183 uint64_t version = ZPL_VERSION;
185 dmu_object_info_t doi;
191 * XXX - hack to auto-create the pool root filesystem at
192 * the first attempted mount.
194 if (dmu_object_info(os, MASTER_NODE_OBJ, &doi) == ENOENT) {
195 dmu_tx_t *tx = dmu_tx_create(os);
197 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* master */
198 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* del queue */
199 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); /* root node */
200 error = dmu_tx_assign(tx, TXG_WAIT);
201 ASSERT3U(error, ==, 0);
202 zfs_create_fs(os, cr, tx);
206 error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_OBJ, 8, 1,
210 } else if (version != ZPL_VERSION) {
211 (void) printf("Mismatched versions: File system "
212 "is version %lld on-disk format, which is "
213 "incompatible with this software version %lld!",
214 (u_longlong_t)version, ZPL_VERSION);
219 * The fsid is 64 bits, composed of an 8-bit fs type, which
220 * separates our fsid from any other filesystem types, and a
221 * 56-bit objset unique ID. The objset unique ID is unique to
222 * all objsets open on this system, provided by unique_create().
223 * The 8-bit fs type must be put in the low bits of fsid[1]
224 * because that's where other Solaris filesystems put it.
226 fsid_guid = dmu_objset_fsid_guid(os);
227 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
228 zfsvfs->z_vfs->vfs_fsid.val[0] = fsid_guid;
229 zfsvfs->z_vfs->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
230 zfsvfs->z_vfs->mnt_vfc->vfc_typenum & 0xFF;
232 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
236 ASSERT(zfsvfs->z_root != 0);
239 * Create the per mount vop tables.
243 * Initialize zget mutex's
245 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
246 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
248 error = zfs_zget(zfsvfs, zfsvfs->z_root, zpp);
251 ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root);
253 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
254 &zfsvfs->z_unlinkedobj);
262 * define a couple of values we need available
263 * for both 64 and 32 bit environments.
266 #define NBITSMINOR64 32
269 #define MAXMAJ64 0xffffffffUL
272 #define MAXMIN64 0xffffffffUL
275 #define major(x) ((int)(((u_int)(x) >> 8)&0xff)) /* major number */
278 #define minor(x) ((int)((x)&0xffff00ff)) /* minor number */
282 * Create special expldev for ZFS private use.
283 * Can't use standard expldev since it doesn't do
284 * what we want. The standard expldev() takes a
285 * dev32_t in LP64 and expands it to a long dev_t.
286 * We need an interface that takes a dev32_t in ILP32
287 * and expands it to a long dev_t.
290 zfs_expldev(dev_t dev)
292 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev));
295 * Special cmpldev for ZFS private use.
296 * Can't use standard cmpldev since it takes
297 * a long dev_t and compresses it to dev32_t in
298 * LP64. We need to do a compaction of a long dev_t
299 * to a dev32_t in ILP32.
302 zfs_cmpldev(uint64_t dev)
304 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64)));
308 * Construct a new znode/vnode and intialize.
310 * This does not do a call to dmu_set_user() that is
311 * up to the caller to do, in case you don't want to
315 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, uint64_t obj_num, int blksz)
321 zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
322 zfs_znode_cache_constructor(zp, zfsvfs->z_vfs, 0);
324 ASSERT(zp->z_dirlocks == NULL);
326 zp->z_phys = db->db_data;
327 zp->z_zfsvfs = zfsvfs;
329 zp->z_atime_dirty = 0;
336 zp->z_seq = 0x7A4653;
339 mutex_enter(&zfsvfs->z_znodes_lock);
340 list_insert_tail(&zfsvfs->z_all_znodes, zp);
341 mutex_exit(&zfsvfs->z_znodes_lock);
347 error = insmntque(vp, zfsvfs->z_vfs);
348 KASSERT(error == 0, ("insmntque() failed: error %d", error));
350 vp->v_type = IFTOVT((mode_t)zp->z_phys->zp_mode);
351 switch (vp->v_type) {
353 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
356 vp->v_op = &zfs_fifoops;
364 zfs_znode_dmu_init(znode_t *zp)
367 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
368 dmu_buf_t *db = zp->z_dbuf;
370 mutex_enter(&zp->z_lock);
372 nzp = dmu_buf_set_user(db, zp, &zp->z_phys, znode_pageout_func);
376 * concurrent zgets on this object.
378 ASSERT3P(nzp, ==, NULL);
381 * Slap on VROOT if we are the root znode
383 if (zp->z_id == zfsvfs->z_root) {
384 ZTOV(zp)->v_flag |= VROOT;
387 ASSERT(zp->z_dbuf_held == 0);
389 VFS_HOLD(zfsvfs->z_vfs);
390 mutex_exit(&zp->z_lock);
394 * Create a new DMU object to hold a zfs znode.
396 * IN: dzp - parent directory for new znode
397 * vap - file attributes for new znode
398 * tx - dmu transaction id for zap operations
399 * cr - credentials of caller
401 * IS_ROOT_NODE - new object will be root
402 * IS_XATTR - new object is an attribute
403 * IS_REPLAY - intent log replay
405 * OUT: oid - ID of created object
409 zfs_mknode(znode_t *dzp, vattr_t *vap, uint64_t *oid, dmu_tx_t *tx, cred_t *cr,
410 uint_t flag, znode_t **zpp, int bonuslen)
415 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
420 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
422 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */
423 *oid = vap->va_nodeid;
425 now = vap->va_ctime; /* see zfs_replay_create() */
426 gen = vap->va_nblocks; /* ditto */
430 gen = dmu_tx_get_txg(tx);
434 * Create a new DMU object.
437 * There's currently no mechanism for pre-reading the blocks that will
438 * be to needed allocate a new object, so we accept the small chance
439 * that there will be an i/o error and we will fail one of the
442 if (vap->va_type == VDIR) {
443 if (flag & IS_REPLAY) {
444 err = zap_create_claim(zfsvfs->z_os, *oid,
445 DMU_OT_DIRECTORY_CONTENTS,
446 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
447 ASSERT3U(err, ==, 0);
449 *oid = zap_create(zfsvfs->z_os,
450 DMU_OT_DIRECTORY_CONTENTS,
451 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
454 if (flag & IS_REPLAY) {
455 err = dmu_object_claim(zfsvfs->z_os, *oid,
456 DMU_OT_PLAIN_FILE_CONTENTS, 0,
457 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
458 ASSERT3U(err, ==, 0);
460 *oid = dmu_object_alloc(zfsvfs->z_os,
461 DMU_OT_PLAIN_FILE_CONTENTS, 0,
462 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
465 VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, *oid, NULL, &dbp));
466 dmu_buf_will_dirty(dbp, tx);
469 * Initialize the znode physical data to zero.
471 ASSERT(dbp->db_size >= sizeof (znode_phys_t));
472 bzero(dbp->db_data, dbp->db_size);
476 * If this is the root, fix up the half-initialized parent pointer
477 * to reference the just-allocated physical data area.
479 if (flag & IS_ROOT_NODE) {
485 * If parent is an xattr, so am I.
487 if (dzp->z_phys->zp_flags & ZFS_XATTR)
490 if (vap->va_type == VBLK || vap->va_type == VCHR) {
491 pzp->zp_rdev = zfs_expldev(vap->va_rdev);
494 if (vap->va_type == VDIR) {
495 pzp->zp_size = 2; /* contents ("." and "..") */
496 pzp->zp_links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
499 pzp->zp_parent = dzp->z_id;
501 pzp->zp_flags |= ZFS_XATTR;
505 ZFS_TIME_ENCODE(&now, pzp->zp_crtime);
506 ZFS_TIME_ENCODE(&now, pzp->zp_ctime);
508 if (vap->va_mask & AT_ATIME) {
509 ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime);
511 ZFS_TIME_ENCODE(&now, pzp->zp_atime);
514 if (vap->va_mask & AT_MTIME) {
515 ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime);
517 ZFS_TIME_ENCODE(&now, pzp->zp_mtime);
520 pzp->zp_mode = MAKEIMODE(vap->va_type, vap->va_mode);
521 zp = zfs_znode_alloc(zfsvfs, dbp, *oid, 0);
523 zfs_perm_init(zp, dzp, flag, vap, tx, cr);
526 kmutex_t *hash_mtx = ZFS_OBJ_MUTEX(zp);
528 mutex_enter(hash_mtx);
529 zfs_znode_dmu_init(zp);
530 mutex_exit(hash_mtx);
534 if (ZTOV(zp) != NULL)
535 ZTOV(zp)->v_count = 0;
536 dmu_buf_rele(dbp, NULL);
542 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
544 dmu_object_info_t doi;
552 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
554 err = dmu_bonus_hold(zfsvfs->z_os, obj_num, NULL, &db);
556 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
560 dmu_object_info_from_db(db, &doi);
561 if (doi.doi_bonus_type != DMU_OT_ZNODE ||
562 doi.doi_bonus_size < sizeof (znode_phys_t)) {
563 dmu_buf_rele(db, NULL);
564 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
568 ASSERT(db->db_object == obj_num);
569 ASSERT(db->db_offset == -1);
570 ASSERT(db->db_data != NULL);
572 zp = dmu_buf_get_user(db);
575 mutex_enter(&zp->z_lock);
577 ASSERT3U(zp->z_id, ==, obj_num);
578 if (zp->z_unlinked) {
579 dmu_buf_rele(db, NULL);
580 mutex_exit(&zp->z_lock);
581 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
583 } else if (zp->z_dbuf_held) {
584 dmu_buf_rele(db, NULL);
587 VFS_HOLD(zfsvfs->z_vfs);
590 if (ZTOV(zp) != NULL)
593 err = getnewvnode("zfs", zfsvfs->z_vfs, &zfs_vnodeops,
597 vp->v_data = (caddr_t)zp;
599 vp->v_type = IFTOVT((mode_t)zp->z_phys->zp_mode);
600 if (vp->v_type == VDIR)
601 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
602 err = insmntque(vp, zfsvfs->z_vfs);
603 KASSERT(err == 0, ("insmntque() failed: error %d", err));
605 mutex_exit(&zp->z_lock);
606 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
612 * Not found create new znode/vnode
614 zp = zfs_znode_alloc(zfsvfs, db, obj_num, doi.doi_data_block_size);
615 ASSERT3U(zp->z_id, ==, obj_num);
616 zfs_znode_dmu_init(zp);
617 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
623 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
625 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
628 ZFS_OBJ_HOLD_ENTER(zfsvfs, zp->z_id);
629 if (zp->z_phys->zp_acl.z_acl_extern_obj) {
630 error = dmu_object_free(zfsvfs->z_os,
631 zp->z_phys->zp_acl.z_acl_extern_obj, tx);
632 ASSERT3U(error, ==, 0);
634 error = dmu_object_free(zfsvfs->z_os, zp->z_id, tx);
635 ASSERT3U(error, ==, 0);
637 ZFS_OBJ_HOLD_EXIT(zfsvfs, zp->z_id);
638 dmu_buf_rele(zp->z_dbuf, NULL);
642 zfs_zinactive(znode_t *zp)
644 vnode_t *vp = ZTOV(zp);
645 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
646 uint64_t z_id = zp->z_id;
648 ASSERT(zp->z_dbuf_held && zp->z_phys);
651 * Don't allow a zfs_zget() while were trying to release this znode
653 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
655 mutex_enter(&zp->z_lock);
657 if (vp->v_count > 0) {
659 * If the hold count is greater than zero, somebody has
660 * obtained a new reference on this znode while we were
661 * processing it here, so we are done.
664 mutex_exit(&zp->z_lock);
665 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
671 * If this was the last reference to a file with no links,
672 * remove the file from the file system.
674 if (zp->z_unlinked) {
676 mutex_exit(&zp->z_lock);
677 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
678 ASSERT(vp->v_count == 0);
679 vrecycle(vp, curthread);
681 VFS_RELE(zfsvfs->z_vfs);
685 ASSERT(zp->z_dbuf_held);
688 mutex_exit(&zp->z_lock);
689 dmu_buf_rele(zp->z_dbuf, NULL);
690 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
691 VFS_RELE(zfsvfs->z_vfs);
695 * FreeBSD: Should be called from ->vop_reclaim().
698 zfs_znode_free(znode_t *zp)
700 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
702 mutex_enter(&zfsvfs->z_znodes_lock);
703 list_remove(&zfsvfs->z_all_znodes, zp);
704 mutex_exit(&zfsvfs->z_znodes_lock);
706 kmem_cache_free(znode_cache, zp);
710 zfs_time_stamper_locked(znode_t *zp, uint_t flag, dmu_tx_t *tx)
714 ASSERT(MUTEX_HELD(&zp->z_lock));
719 dmu_buf_will_dirty(zp->z_dbuf, tx);
720 zp->z_atime_dirty = 0;
723 zp->z_atime_dirty = 1;
727 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_atime);
730 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_mtime);
733 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_ctime);
737 * Update the requested znode timestamps with the current time.
738 * If we are in a transaction, then go ahead and mark the znode
739 * dirty in the transaction so the timestamps will go to disk.
740 * Otherwise, we will get pushed next time the znode is updated
741 * in a transaction, or when this znode eventually goes inactive.
744 * 1 - Only the ACCESS time is ever updated outside of a transaction.
745 * 2 - Multiple consecutive updates will be collapsed into a single
746 * znode update by the transaction grouping semantics of the DMU.
749 zfs_time_stamper(znode_t *zp, uint_t flag, dmu_tx_t *tx)
751 mutex_enter(&zp->z_lock);
752 zfs_time_stamper_locked(zp, flag, tx);
753 mutex_exit(&zp->z_lock);
757 * Grow the block size for a file.
759 * IN: zp - znode of file to free data in.
760 * size - requested block size
761 * tx - open transaction.
763 * NOTE: this function assumes that the znode is write locked.
766 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
771 if (size <= zp->z_blksz)
774 * If the file size is already greater than the current blocksize,
775 * we will not grow. If there is more than one block in a file,
776 * the blocksize cannot change.
778 if (zp->z_blksz && zp->z_phys->zp_size > zp->z_blksz)
781 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
783 if (error == ENOTSUP)
785 ASSERT3U(error, ==, 0);
787 /* What blocksize did we actually get? */
788 dmu_object_size_from_db(zp->z_dbuf, &zp->z_blksz, &dummy);
792 * Free space in a file.
794 * IN: zp - znode of file to free data in.
795 * off - start of section to free.
796 * len - length of section to free (0 => to EOF).
797 * flag - current file open mode flags.
799 * RETURN: 0 if success
800 * error code if failure
803 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
805 vnode_t *vp = ZTOV(zp);
807 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
808 zilog_t *zilog = zfsvfs->z_log;
810 uint64_t end = off + len;
811 uint64_t size, new_blksz;
814 if (ZTOV(zp)->v_type == VFIFO)
818 * If we will change zp_size then lock the whole file,
819 * otherwise just lock the range being freed.
821 if (len == 0 || off + len > zp->z_phys->zp_size) {
822 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
824 rl = zfs_range_lock(zp, off, len, RL_WRITER);
825 /* recheck, in case zp_size changed */
826 if (off + len > zp->z_phys->zp_size) {
827 /* lost race: file size changed, lock whole file */
828 zfs_range_unlock(rl);
829 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
834 * Nothing to do if file already at desired length.
836 size = zp->z_phys->zp_size;
837 if (len == 0 && size == off) {
838 zfs_range_unlock(rl);
842 tx = dmu_tx_create(zfsvfs->z_os);
843 dmu_tx_hold_bonus(tx, zp->z_id);
846 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
848 * We are growing the file past the current block size.
850 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
851 ASSERT(!ISP2(zp->z_blksz));
852 new_blksz = MIN(end, SPA_MAXBLOCKSIZE);
854 new_blksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
856 dmu_tx_hold_write(tx, zp->z_id, 0, MIN(end, new_blksz));
857 } else if (off < size) {
859 * If len == 0, we are truncating the file.
861 dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END);
864 error = dmu_tx_assign(tx, zfsvfs->z_assign);
866 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT)
869 zfs_range_unlock(rl);
874 zfs_grow_blocksize(zp, new_blksz, tx);
876 if (end > size || len == 0)
877 zp->z_phys->zp_size = end;
880 objset_t *os = zfsvfs->z_os;
887 VERIFY(0 == dmu_free_range(os, zp->z_id, off, rlen, tx));
891 zfs_time_stamper(zp, CONTENT_MODIFIED, tx);
892 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
895 zfs_range_unlock(rl);
900 * Clear any mapped pages in the truncated region. This has to
901 * happen outside of the transaction to avoid the possibility of
902 * a deadlock with someone trying to push a page that we are
903 * about to invalidate.
905 rw_enter(&zp->z_map_lock, RW_WRITER);
907 vnode_pager_setsize(vp, end);
910 error = vtruncbuf(vp, curthread->td_ucred, curthread, end, PAGE_SIZE);
912 error = vinvalbuf(vp, V_SAVE, curthread, 0, 0);
913 vnode_pager_setsize(vp, end);
916 rw_exit(&zp->z_map_lock);
922 zfs_create_fs(objset_t *os, cred_t *cr, dmu_tx_t *tx)
925 uint64_t moid, doid, roid = 0;
926 uint64_t version = ZPL_VERSION;
928 znode_t *rootzp = NULL;
932 * First attempt to create master node.
935 * In an empty objset, there are no blocks to read and thus
936 * there can be no i/o errors (which we assert below).
938 moid = MASTER_NODE_OBJ;
939 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
944 * Set starting attributes.
947 error = zap_update(os, moid, ZPL_VERSION_OBJ, 8, 1, &version, tx);
951 * Create a delete queue.
953 doid = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
955 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &doid, tx);
959 * Create root znode. Create minimal znode/vnode/zfsvfs
960 * to allow zfs_mknode to work.
962 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
963 vattr.va_type = VDIR;
964 vattr.va_mode = S_IFDIR|0755;
965 vattr.va_uid = UID_ROOT;
966 vattr.va_gid = GID_WHEEL;
968 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
969 zfs_znode_cache_constructor(rootzp, NULL, 0);
970 rootzp->z_zfsvfs = &zfsvfs;
971 rootzp->z_unlinked = 0;
972 rootzp->z_atime_dirty = 0;
973 rootzp->z_dbuf_held = 0;
975 bzero(&zfsvfs, sizeof (zfsvfs_t));
978 zfsvfs.z_assign = TXG_NOWAIT;
979 zfsvfs.z_parent = &zfsvfs;
981 mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
982 list_create(&zfsvfs.z_all_znodes, sizeof (znode_t),
983 offsetof(znode_t, z_link_node));
985 zfs_mknode(rootzp, &vattr, &roid, tx, cr, IS_ROOT_NODE, NULL, 0);
986 ASSERT3U(rootzp->z_id, ==, roid);
987 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &roid, tx);
990 kmem_cache_free(znode_cache, rootzp);
995 * Given an object number, return its parent object number and whether
996 * or not the object is an extended attribute directory.
999 zfs_obj_to_pobj(objset_t *osp, uint64_t obj, uint64_t *pobjp, int *is_xattrdir)
1002 dmu_object_info_t doi;
1006 if ((error = dmu_bonus_hold(osp, obj, FTAG, &db)) != 0)
1009 dmu_object_info_from_db(db, &doi);
1010 if (doi.doi_bonus_type != DMU_OT_ZNODE ||
1011 doi.doi_bonus_size < sizeof (znode_phys_t)) {
1012 dmu_buf_rele(db, FTAG);
1017 *pobjp = zp->zp_parent;
1018 *is_xattrdir = ((zp->zp_flags & ZFS_XATTR) != 0) &&
1019 S_ISDIR(zp->zp_mode);
1020 dmu_buf_rele(db, FTAG);
1026 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
1028 char *path = buf + len - 1;
1035 char component[MAXNAMELEN + 2];
1039 if ((error = zfs_obj_to_pobj(osp, obj, &pobj,
1040 &is_xattrdir)) != 0)
1051 (void) sprintf(component + 1, "<xattrdir>");
1053 error = zap_value_search(osp, pobj, obj, component + 1);
1058 complen = strlen(component);
1060 ASSERT(path >= buf);
1061 bcopy(component, path, complen);
1066 (void) memmove(buf, path, buf + len - path);