2 * Copyright (c) 2007 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.28 2008/02/06 08:59:28 dillon Exp $
42 * The kernel is not actively referencing this vnode but is still holding
46 hammer_vop_inactive(struct vop_inactive_args *ap)
48 struct hammer_inode *ip = VTOI(ap->a_vp);
59 * If the inode no longer has any references we recover its
60 * in-memory resources immediately.
62 if (ip->ino_rec.ino_nlinks == 0)
68 * Release the vnode association. This is typically (but not always)
69 * the last reference on the inode and will flush the inode to the
72 * XXX Currently our sync code only runs through inodes with vnode
73 * associations, so we depend on hammer_rel_inode() to sync any inode
74 * record data to the block device prior to losing the association.
75 * Otherwise transactions that the user expected to be distinct by
76 * doing a manual sync may be merged.
79 hammer_vop_reclaim(struct vop_reclaim_args *ap)
81 struct hammer_inode *ip;
86 if ((ip = vp->v_data) != NULL) {
89 hammer_rel_inode(ip, 0);
95 * Return a locked vnode for the specified inode. The inode must be
96 * referenced but NOT LOCKED on entry and will remain referenced on
100 hammer_get_vnode(struct hammer_inode *ip, int lktype, struct vnode **vpp)
106 if ((vp = ip->vp) == NULL) {
107 error = getnewvnode(VT_HAMMER, ip->hmp->mp, vpp, 0, 0);
110 hammer_lock_ex(&ip->lock);
111 if (ip->vp != NULL) {
112 hammer_unlock(&ip->lock);
117 hammer_ref(&ip->lock);
120 vp->v_type = hammer_get_vnode_type(
121 ip->ino_rec.base.base.obj_type);
123 switch(ip->ino_rec.base.base.obj_type) {
124 case HAMMER_OBJTYPE_CDEV:
125 case HAMMER_OBJTYPE_BDEV:
126 vp->v_ops = &ip->hmp->mp->mnt_vn_spec_ops;
127 addaliasu(vp, ip->ino_data.rmajor,
128 ip->ino_data.rminor);
130 case HAMMER_OBJTYPE_FIFO:
131 vp->v_ops = &ip->hmp->mp->mnt_vn_fifo_ops;
138 * Only mark as the root vnode if the ip is not
139 * historical, otherwise the VFS cache will get
140 * confused. The other half of the special handling
141 * is in hammer_vop_nlookupdotdot().
143 if (ip->obj_id == HAMMER_OBJID_ROOT &&
144 ip->obj_asof == ip->hmp->asof) {
148 vp->v_data = (void *)ip;
149 /* vnode locked by getnewvnode() */
150 /* make related vnode dirty if inode dirty? */
151 hammer_unlock(&ip->lock);
152 if (vp->v_type == VREG)
153 vinitvmio(vp, ip->ino_rec.ino_size);
158 * loop if the vget fails (aka races), or if the vp
159 * no longer matches ip->vp.
161 if (vget(vp, LK_EXCLUSIVE) == 0) {
172 * Acquire a HAMMER inode. The returned inode is not locked. These functions
173 * do not attach or detach the related vnode (use hammer_get_vnode() for
176 * The flags argument is only applied for newly created inodes, and only
177 * certain flags are inherited.
179 struct hammer_inode *
180 hammer_get_inode(struct hammer_mount *hmp, struct hammer_node **cache,
181 u_int64_t obj_id, hammer_tid_t asof, int flags, int *errorp)
183 struct hammer_inode_info iinfo;
184 struct hammer_cursor cursor;
185 struct hammer_inode *ip;
188 * Determine if we already have an inode cached. If we do then
191 iinfo.obj_id = obj_id;
192 iinfo.obj_asof = asof;
194 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
196 hammer_ref(&ip->lock);
201 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
202 ++hammer_count_inodes;
204 ip->obj_asof = iinfo.obj_asof;
206 ip->flags = flags & HAMMER_INODE_RO;
208 ip->flags |= HAMMER_INODE_RO;
209 RB_INIT(&ip->rec_tree);
212 * Locate the on-disk inode.
215 hammer_init_cursor_hmp(&cursor, cache, hmp);
216 cursor.key_beg.obj_id = ip->obj_id;
217 cursor.key_beg.key = 0;
218 cursor.key_beg.create_tid = 0;
219 cursor.key_beg.delete_tid = 0;
220 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
221 cursor.key_beg.obj_type = 0;
222 cursor.asof = iinfo.obj_asof;
223 cursor.flags = HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_GET_DATA |
226 *errorp = hammer_btree_lookup(&cursor);
227 if (*errorp == EDEADLK) {
228 hammer_done_cursor(&cursor);
233 * On success the B-Tree lookup will hold the appropriate
234 * buffer cache buffers and provide a pointer to the requested
235 * information. Copy the information to the in-memory inode
236 * and cache the B-Tree node to improve future operations.
239 ip->ino_rec = cursor.record->inode;
240 ip->ino_data = cursor.data->inode;
241 hammer_cache_node(cursor.node, &ip->cache[0]);
243 hammer_cache_node(cursor.node, cache);
247 * On success load the inode's record and data and insert the
248 * inode into the B-Tree. It is possible to race another lookup
249 * insertion of the same inode so deal with that condition too.
251 * The cursor's locked node interlocks against others creating and
252 * destroying ip while we were blocked.
255 hammer_ref(&ip->lock);
256 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
257 hammer_uncache_node(&ip->cache[0]);
258 hammer_uncache_node(&ip->cache[1]);
259 hammer_unref(&ip->lock);
260 --hammer_count_inodes;
262 hammer_done_cursor(&cursor);
265 ip->flags |= HAMMER_INODE_ONDISK;
267 --hammer_count_inodes;
271 hammer_done_cursor(&cursor);
276 * Create a new filesystem object, returning the inode in *ipp. The
277 * returned inode will be referenced but not locked.
279 * The inode is created in-memory and will be delay-synchronized to the
283 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
284 struct ucred *cred, hammer_inode_t dip,
285 struct hammer_inode **ipp)
292 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
293 ++hammer_count_inodes;
294 ip->obj_id = hammer_alloc_tid(trans);
295 KKASSERT(ip->obj_id != 0);
296 ip->obj_asof = hmp->asof;
298 ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_RDIRTY |
299 HAMMER_INODE_ITIMES | HAMMER_INODE_TIDLOCKED;
300 ip->last_tid = trans->tid;
302 RB_INIT(&ip->rec_tree);
304 ip->ino_rec.ino_atime = trans->tid;
305 ip->ino_rec.ino_mtime = trans->tid;
306 ip->ino_rec.ino_size = 0;
307 ip->ino_rec.ino_nlinks = 0;
309 ip->ino_rec.base.base.btype = HAMMER_BTREE_TYPE_RECORD;
310 ip->ino_rec.base.base.obj_id = ip->obj_id;
311 ip->ino_rec.base.base.key = 0;
312 ip->ino_rec.base.base.create_tid = trans->tid;
313 ip->ino_rec.base.base.delete_tid = 0;
314 ip->ino_rec.base.base.rec_type = HAMMER_RECTYPE_INODE;
315 ip->ino_rec.base.base.obj_type = hammer_get_obj_type(vap->va_type);
317 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
318 ip->ino_data.mode = vap->va_mode;
319 ip->ino_data.ctime = trans->tid;
320 ip->ino_data.parent_obj_id = (dip) ? dip->ino_rec.base.base.obj_id : 0;
322 switch(ip->ino_rec.base.base.obj_type) {
323 case HAMMER_OBJTYPE_CDEV:
324 case HAMMER_OBJTYPE_BDEV:
325 ip->ino_data.rmajor = vap->va_rmajor;
326 ip->ino_data.rminor = vap->va_rminor;
333 * Calculate default uid/gid and overwrite with information from
336 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
337 ip->ino_data.gid = dip->ino_data.gid;
338 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred,
340 ip->ino_data.mode = vap->va_mode;
342 if (vap->va_vaflags & VA_UID_UUID_VALID)
343 ip->ino_data.uid = vap->va_uid_uuid;
344 else if (vap->va_uid != (uid_t)VNOVAL)
345 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
346 if (vap->va_vaflags & VA_GID_UUID_VALID)
347 ip->ino_data.gid = vap->va_gid_uuid;
348 else if (vap->va_gid != (gid_t)VNOVAL)
349 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
351 hammer_ref(&ip->lock);
352 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
353 hammer_unref(&ip->lock);
354 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id);
361 * Called by hammer_sync_inode().
364 hammer_update_inode(hammer_inode_t ip)
366 struct hammer_cursor cursor;
367 struct hammer_cursor *spike = NULL;
368 hammer_record_t record;
370 hammer_tid_t last_tid;
373 * Locate the record on-disk and mark it as deleted. Both the B-Tree
374 * node and the record must be marked deleted. The record may or
375 * may not be physically deleted, depending on the retention policy.
377 * If the inode has already been deleted on-disk we have nothing
380 * XXX Update the inode record and data in-place if the retention
383 last_tid = ip->last_tid;
387 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
388 HAMMER_INODE_ONDISK) {
389 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
390 cursor.key_beg.obj_id = ip->obj_id;
391 cursor.key_beg.key = 0;
392 cursor.key_beg.create_tid = 0;
393 cursor.key_beg.delete_tid = 0;
394 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
395 cursor.key_beg.obj_type = 0;
396 cursor.asof = ip->obj_asof;
397 cursor.flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF;
399 error = hammer_btree_lookup(&cursor);
402 error = hammer_ip_delete_record(&cursor, last_tid);
404 ip->flags |= HAMMER_INODE_DELONDISK;
405 hammer_cache_node(cursor.node, &ip->cache[0]);
407 hammer_done_cursor(&cursor);
408 if (error == EDEADLK)
413 * Write out a new record if the in-memory inode is not marked
414 * as having been deleted. Update our inode statistics if this
415 * is the first application of the inode on-disk.
417 * If the inode has been deleted permanently, HAMMER_INODE_DELONDISK
418 * will remain set and prevent further updates.
420 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
421 record = hammer_alloc_mem_record(ip);
422 record->rec.inode = ip->ino_rec;
423 record->rec.inode.base.base.create_tid = last_tid;
424 record->rec.inode.base.data_len = sizeof(ip->ino_data);
425 record->data = (void *)&ip->ino_data;
426 error = hammer_ip_sync_record(record, &spike);
427 record->flags |= HAMMER_RECF_DELETED;
428 hammer_rel_mem_record(record);
429 if (error == ENOSPC) {
430 error = hammer_spike(&spike);
434 KKASSERT(spike == NULL);
436 ip->flags &= ~(HAMMER_INODE_RDIRTY |
437 HAMMER_INODE_DDIRTY |
438 HAMMER_INODE_DELONDISK |
439 HAMMER_INODE_ITIMES);
440 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
441 hammer_modify_volume(ip->hmp->rootvol);
442 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
443 ip->flags |= HAMMER_INODE_ONDISK;
447 * Unlock the sync TID if it was locked, now that
448 * we have written it out to disk.
450 ip->flags &= ~HAMMER_INODE_TIDLOCKED;
457 * Update only the itimes fields. This is done no-historically. The
458 * record is updated in-place on the disk.
461 hammer_update_itimes(hammer_inode_t ip)
463 struct hammer_cursor cursor;
464 struct hammer_inode_record *rec;
469 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
470 HAMMER_INODE_ONDISK) {
471 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
472 cursor.key_beg.obj_id = ip->obj_id;
473 cursor.key_beg.key = 0;
474 cursor.key_beg.create_tid = 0;
475 cursor.key_beg.delete_tid = 0;
476 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
477 cursor.key_beg.obj_type = 0;
478 cursor.asof = ip->obj_asof;
479 cursor.flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF;
481 error = hammer_btree_lookup(&cursor);
483 rec = &cursor.record->inode;
484 hammer_modify_buffer_nodep(cursor.record_buffer);
485 rec->ino_atime = ip->ino_rec.ino_atime;
486 rec->ino_mtime = ip->ino_rec.ino_mtime;
487 ip->flags &= ~HAMMER_INODE_ITIMES;
488 /* XXX recalculate crc */
489 hammer_cache_node(cursor.node, &ip->cache[0]);
491 hammer_done_cursor(&cursor);
492 if (error == EDEADLK)
499 * Release a reference on an inode. If asked to flush the last release
500 * will flush the inode.
503 hammer_rel_inode(struct hammer_inode *ip, int flush)
505 hammer_unref(&ip->lock);
507 ip->flags |= HAMMER_INODE_FLUSH;
508 if (ip->lock.refs == 0) {
509 if (ip->flags & HAMMER_INODE_FLUSH)
510 hammer_unload_inode(ip, (void *)MNT_WAIT);
512 hammer_unload_inode(ip, (void *)MNT_NOWAIT);
517 * Unload and destroy the specified inode.
519 * (typically called via RB_SCAN)
522 hammer_unload_inode(struct hammer_inode *ip, void *data)
526 KASSERT(ip->lock.refs == 0,
527 ("hammer_unload_inode: %d refs\n", ip->lock.refs));
528 KKASSERT(ip->vp == NULL);
529 hammer_ref(&ip->lock);
531 error = hammer_sync_inode(ip, (int)data, 1);
533 kprintf("hammer_sync_inode failed error %d\n", error);
534 if (ip->lock.refs == 1) {
535 KKASSERT(RB_EMPTY(&ip->rec_tree));
536 RB_REMOVE(hammer_ino_rb_tree, &ip->hmp->rb_inos_root, ip);
538 hammer_uncache_node(&ip->cache[0]);
539 hammer_uncache_node(&ip->cache[1]);
540 --hammer_count_inodes;
543 hammer_unref(&ip->lock);
549 * A transaction has modified an inode, requiring updates as specified by
552 * HAMMER_INODE_RDIRTY: Inode record has been updated
553 * HAMMER_INODE_DDIRTY: Inode data has been updated
554 * HAMMER_INODE_DELETED: Inode record/data must be deleted
555 * HAMMER_INODE_ITIMES: mtime/atime has been updated
557 * last_tid is the TID to use to generate the correct TID when the inode
558 * is synced to disk. The first inode record laid out on disk must match
559 * the transaction id of the related directory entry so only update last_tid
560 * if that has already occured.
563 hammer_modify_inode(struct hammer_transaction *trans,
564 struct hammer_inode *ip, int flags)
566 KKASSERT ((ip->flags & HAMMER_INODE_RO) == 0 ||
567 (HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY|
568 HAMMER_INODE_DELETED|HAMMER_INODE_ITIMES) == 0);
571 (HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY|HAMMER_INODE_DELETED)) {
572 if (hammer_debug_tid) {
573 kprintf("hammer_modify_inode: %016llx (%08x)\n",
574 trans->tid, (int)(trans->tid / 1000000000LL));
578 * Update the inode sync transaction id unless it's locked
579 * due to some prior required synchroznization. Locking the
580 * tid in the new flags overrides this (used by rename).
582 if ((ip->flags & HAMMER_INODE_TIDLOCKED) == 0)
583 ip->last_tid = trans->tid;
584 else if (flags & HAMMER_INODE_TIDLOCKED)
585 ip->last_tid = trans->tid;
591 * Sync any dirty buffers and records associated with an inode. The
592 * inode's last_tid field is used as the transaction id for the sync,
593 * overriding any intermediate TIDs that were used for records. Note
594 * that the dirty buffer cache buffers do not have any knowledge of
595 * the transaction id they were modified under.
597 * If we can't sync due to a cluster becoming full the spike structure
598 * will be filled in and ENOSPC returned. We must return -ENOSPC to
599 * terminate the RB_SCAN.
602 hammer_sync_inode_callback(hammer_record_t rec, void *data)
604 struct hammer_cursor **spike = data;
607 hammer_ref(&rec->lock);
608 error = hammer_ip_sync_record(rec, spike);
609 hammer_rel_mem_record(rec);
613 if (error != -ENOSPC) {
614 kprintf("hammer_sync_inode_callback: sync failed rec "
615 "%p, error %d\n", rec, error);
625 hammer_sync_inode(hammer_inode_t ip, int waitfor, int handle_delete)
627 struct hammer_transaction trans;
628 struct hammer_cursor *spike = NULL;
631 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
635 hammer_lock_ex(&ip->lock);
638 * Use the transaction id of the last operation to sync.
641 hammer_start_transaction_tid(&trans, ip->hmp, ip->last_tid);
643 hammer_start_transaction(&trans, ip->hmp);
646 * If the inode has been deleted (nlinks == 0), and the OS no longer
647 * has any references to it (handle_delete != 0), clean up in-memory
650 * NOTE: We do not set the RDIRTY flag when updating the delete_tid,
651 * setting HAMMER_INODE_DELETED takes care of it.
653 * NOTE: Because we may sync records within this new transaction,
654 * force the inode update later on to use our transaction id or
655 * the delete_tid of the inode may be less then the create_tid of
656 * the inode update. XXX shouldn't happen but don't take the chance.
658 * NOTE: The call to hammer_ip_delete_range() cannot return ENOSPC
659 * so we can pass a NULL spike structure, because no partial data
660 * deletion can occur (yet).
662 if (ip->ino_rec.ino_nlinks == 0 && handle_delete &&
663 (ip->flags & HAMMER_INODE_GONE) == 0) {
664 ip->flags |= HAMMER_INODE_GONE;
666 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE);
667 error = hammer_ip_delete_range_all(&trans, ip);
668 KKASSERT(RB_EMPTY(&ip->rec_tree));
669 ip->ino_rec.base.base.delete_tid = trans.tid;
670 hammer_modify_inode(&trans, ip, HAMMER_INODE_DELETED);
671 hammer_modify_volume(ip->hmp->rootvol);
672 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
676 * Sync the buffer cache.
678 if (ip->vp != NULL) {
679 error = vfsync(ip->vp, waitfor, 1, NULL, NULL);
680 if (RB_ROOT(&ip->vp->v_rbdirty_tree) == NULL)
681 ip->flags &= ~HAMMER_INODE_BUFS;
688 * Now sync related records
691 error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
692 hammer_sync_inode_callback, &spike);
693 KKASSERT(error <= 0);
696 if (error == ENOSPC) {
697 error = hammer_spike(&spike);
703 if (RB_EMPTY(&ip->rec_tree))
704 ip->flags &= ~HAMMER_INODE_XDIRTY;
707 * Now update the inode's on-disk inode-data and/or on-disk record.
709 switch(ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK)) {
710 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
712 * If deleted and on-disk, don't set any additional flags.
713 * the delete flag takes care of things.
716 case HAMMER_INODE_DELETED:
718 * Take care of the case where a deleted inode was never
719 * flushed to the disk in the first place.
721 ip->flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY|
722 HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES);
723 while (RB_ROOT(&ip->rec_tree)) {
724 hammer_record_t rec = RB_ROOT(&ip->rec_tree);
725 hammer_ref(&rec->lock);
726 rec->flags |= HAMMER_RECF_DELETED;
727 hammer_rel_mem_record(rec);
730 case HAMMER_INODE_ONDISK:
732 * If already on-disk, do not set any additional flags.
737 * If not on-disk and not deleted, set both dirty flags
738 * to force an initial record to be written.
740 ip->flags |= HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY;
745 * If RDIRTY or DDIRTY is set, write out a new record. If the inode
746 * is already on-disk the old record is marked as deleted.
748 * If DELETED is set hammer_update_inode() will delete the existing
749 * record without writing out a new one.
751 * If *ONLY* the ITIMES flag is set we can update the record in-place.
753 if ((ip->flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY |
754 HAMMER_INODE_ITIMES | HAMMER_INODE_DELETED)) ==
755 HAMMER_INODE_ITIMES) {
756 error = hammer_update_itimes(ip);
758 if (ip->flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY |
759 HAMMER_INODE_ITIMES | HAMMER_INODE_DELETED)) {
760 error = hammer_update_inode(ip);
762 hammer_commit_transaction(&trans);
763 hammer_unlock(&ip->lock);
768 * Access the filesystem buffer containing the cluster-relative byte
769 * offset, validate the buffer type, load *bufferp and return a
770 * pointer to the requested data. The buffer is reference and locked on
773 * If buf_type is 0 the buffer is assumed to be a pure-data buffer and
774 * no type or crc check is performed.
776 * If *bufferp is not NULL on entry it is assumed to contain a locked
777 * and referenced buffer which will then be replaced.
779 * If the caller is holding another unrelated buffer locked it must be
780 * passed in reorderbuf so we can properly order buffer locks.
782 * XXX add a flag for the buffer type and check the CRC here XXX
785 hammer_bread(hammer_cluster_t cluster, int32_t cloff,
786 u_int64_t buf_type, int *errorp,
787 struct hammer_buffer **bufferp)
789 hammer_buffer_t buffer;
794 * Load the correct filesystem buffer, replacing *bufferp.
796 buf_no = cloff / HAMMER_BUFSIZE;
798 if (buffer == NULL || buffer->cluster != cluster ||
799 buffer->buf_no != buf_no) {
801 /*hammer_unlock(&buffer->io.lock);*/
802 hammer_rel_buffer(buffer, 0);
804 buffer = hammer_get_buffer(cluster, buf_no, 0, errorp);
808 /*hammer_lock_ex(&buffer->io.lock);*/
812 * Validate the buffer type
814 buf_off = cloff & HAMMER_BUFMASK;
816 if (buf_type != buffer->ondisk->head.buf_type) {
817 kprintf("BUFFER HEAD TYPE MISMATCH %llx %llx\n",
818 buf_type, buffer->ondisk->head.buf_type);
823 if (buf_off < sizeof(buffer->ondisk->head)) {
824 kprintf("BUFFER OFFSET TOO LOW %d\n", buf_off);
832 * Return a pointer to the buffer data.
835 return((char *)buffer->ondisk + buf_off);