2 * Copyright (c) 2007-2008 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 1.99 2008/07/11 01:22:29 dillon Exp $
38 #include <vm/vm_extern.h>
42 static int hammer_unload_inode(struct hammer_inode *ip);
43 static void hammer_free_inode(hammer_inode_t ip);
44 static void hammer_flush_inode_core(hammer_inode_t ip, int flags);
45 static int hammer_setup_child_callback(hammer_record_t rec, void *data);
46 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data);
47 static int hammer_setup_parent_inodes(hammer_inode_t ip);
48 static int hammer_setup_parent_inodes_helper(hammer_record_t record);
49 static void hammer_inode_wakereclaims(hammer_inode_t ip);
52 extern struct hammer_inode *HammerTruncIp;
56 * RB-Tree support for inode structures
59 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2)
61 if (ip1->obj_localization < ip2->obj_localization)
63 if (ip1->obj_localization > ip2->obj_localization)
65 if (ip1->obj_id < ip2->obj_id)
67 if (ip1->obj_id > ip2->obj_id)
69 if (ip1->obj_asof < ip2->obj_asof)
71 if (ip1->obj_asof > ip2->obj_asof)
77 * RB-Tree support for inode structures / special LOOKUP_INFO
80 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip)
82 if (info->obj_localization < ip->obj_localization)
84 if (info->obj_localization > ip->obj_localization)
86 if (info->obj_id < ip->obj_id)
88 if (info->obj_id > ip->obj_id)
90 if (info->obj_asof < ip->obj_asof)
92 if (info->obj_asof > ip->obj_asof)
98 * Used by hammer_scan_inode_snapshots() to locate all of an object's
99 * snapshots. Note that the asof field is not tested, which we can get
100 * away with because it is the lowest-priority field.
103 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data)
105 hammer_inode_info_t info = data;
107 if (ip->obj_localization > info->obj_localization)
109 if (ip->obj_localization < info->obj_localization)
111 if (ip->obj_id > info->obj_id)
113 if (ip->obj_id < info->obj_id)
119 * RB-Tree support for pseudofs structures
122 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2)
124 if (p1->localization < p2->localization)
126 if (p1->localization > p2->localization)
132 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare);
133 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node,
134 hammer_inode_info_cmp, hammer_inode_info_t);
135 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node,
136 hammer_pfs_rb_compare, u_int32_t, localization);
139 * The kernel is not actively referencing this vnode but is still holding
142 * This is called from the frontend.
145 hammer_vop_inactive(struct vop_inactive_args *ap)
147 struct hammer_inode *ip = VTOI(ap->a_vp);
158 * If the inode no longer has visibility in the filesystem try to
159 * recycle it immediately, even if the inode is dirty. Recycling
160 * it quickly allows the system to reclaim buffer cache and VM
161 * resources which can matter a lot in a heavily loaded system.
163 * This can deadlock in vfsync() if we aren't careful.
165 * Do not queue the inode to the flusher if we still have visibility,
166 * otherwise namespace calls such as chmod will unnecessarily generate
167 * multiple inode updates.
169 hammer_inode_unloadable_check(ip, 0);
170 if (ip->ino_data.nlinks == 0) {
171 if (ip->flags & HAMMER_INODE_MODMASK)
172 hammer_flush_inode(ip, 0);
179 * Release the vnode association. This is typically (but not always)
180 * the last reference on the inode.
182 * Once the association is lost we are on our own with regards to
183 * flushing the inode.
186 hammer_vop_reclaim(struct vop_reclaim_args *ap)
188 struct hammer_inode *ip;
194 if ((ip = vp->v_data) != NULL) {
199 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) {
200 ++hammer_count_reclaiming;
201 ++hmp->inode_reclaims;
202 ip->flags |= HAMMER_INODE_RECLAIM;
203 if (hmp->inode_reclaims > HAMMER_RECLAIM_FLUSH &&
204 (hmp->inode_reclaims & 255) == 0) {
205 hammer_flusher_async(hmp);
208 hammer_rel_inode(ip, 1);
214 * Return a locked vnode for the specified inode. The inode must be
215 * referenced but NOT LOCKED on entry and will remain referenced on
218 * Called from the frontend.
221 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp)
231 if ((vp = ip->vp) == NULL) {
232 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0);
235 hammer_lock_ex(&ip->lock);
236 if (ip->vp != NULL) {
237 hammer_unlock(&ip->lock);
242 hammer_ref(&ip->lock);
246 obj_type = ip->ino_data.obj_type;
247 vp->v_type = hammer_get_vnode_type(obj_type);
249 hammer_inode_wakereclaims(ip);
251 switch(ip->ino_data.obj_type) {
252 case HAMMER_OBJTYPE_CDEV:
253 case HAMMER_OBJTYPE_BDEV:
254 vp->v_ops = &hmp->mp->mnt_vn_spec_ops;
255 addaliasu(vp, ip->ino_data.rmajor,
256 ip->ino_data.rminor);
258 case HAMMER_OBJTYPE_FIFO:
259 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops;
266 * Only mark as the root vnode if the ip is not
267 * historical, otherwise the VFS cache will get
268 * confused. The other half of the special handling
269 * is in hammer_vop_nlookupdotdot().
271 * Pseudo-filesystem roots also do not count.
273 if (ip->obj_id == HAMMER_OBJID_ROOT &&
274 ip->obj_asof == hmp->asof &&
275 ip->obj_localization == 0) {
279 vp->v_data = (void *)ip;
280 /* vnode locked by getnewvnode() */
281 /* make related vnode dirty if inode dirty? */
282 hammer_unlock(&ip->lock);
283 if (vp->v_type == VREG)
284 vinitvmio(vp, ip->ino_data.size);
289 * loop if the vget fails (aka races), or if the vp
290 * no longer matches ip->vp.
292 if (vget(vp, LK_EXCLUSIVE) == 0) {
303 * Locate all copies of the inode for obj_id compatible with the specified
304 * asof, reference, and issue the related call-back. This routine is used
305 * for direct-io invalidation and does not create any new inodes.
308 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo,
309 int (*callback)(hammer_inode_t ip, void *data),
312 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root,
313 hammer_inode_info_cmp_all_history,
318 * Acquire a HAMMER inode. The returned inode is not locked. These functions
319 * do not attach or detach the related vnode (use hammer_get_vnode() for
322 * The flags argument is only applied for newly created inodes, and only
323 * certain flags are inherited.
325 * Called from the frontend.
327 struct hammer_inode *
328 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip,
329 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
330 int flags, int *errorp)
332 hammer_mount_t hmp = trans->hmp;
333 struct hammer_inode_info iinfo;
334 struct hammer_cursor cursor;
335 struct hammer_inode *ip;
339 * Determine if we already have an inode cached. If we do then
342 iinfo.obj_id = obj_id;
343 iinfo.obj_asof = asof;
344 iinfo.obj_localization = localization;
346 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
348 hammer_ref(&ip->lock);
354 * Allocate a new inode structure and deal with races later.
356 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
357 ++hammer_count_inodes;
360 ip->obj_asof = iinfo.obj_asof;
361 ip->obj_localization = localization;
363 ip->flags = flags & HAMMER_INODE_RO;
364 ip->cache[0].ip = ip;
365 ip->cache[1].ip = ip;
367 ip->flags |= HAMMER_INODE_RO;
368 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
369 0x7FFFFFFFFFFFFFFFLL;
370 RB_INIT(&ip->rec_tree);
371 TAILQ_INIT(&ip->target_list);
372 hammer_ref(&ip->lock);
375 * Locate the on-disk inode. If this is a PFS root we always
376 * access the current version of the root inode and (if it is not
377 * a master) always access information under it with a snapshot
381 hammer_init_cursor(trans, &cursor, (dip ? &dip->cache[0] : NULL), NULL);
382 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE;
383 cursor.key_beg.obj_id = ip->obj_id;
384 cursor.key_beg.key = 0;
385 cursor.key_beg.create_tid = 0;
386 cursor.key_beg.delete_tid = 0;
387 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
388 cursor.key_beg.obj_type = 0;
390 cursor.asof = iinfo.obj_asof;
391 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA |
394 *errorp = hammer_btree_lookup(&cursor);
395 if (*errorp == EDEADLK) {
396 hammer_done_cursor(&cursor);
401 * On success the B-Tree lookup will hold the appropriate
402 * buffer cache buffers and provide a pointer to the requested
403 * information. Copy the information to the in-memory inode
404 * and cache the B-Tree node to improve future operations.
407 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
408 ip->ino_data = cursor.data->inode;
411 * cache[0] tries to cache the location of the object inode.
412 * The assumption is that it is near the directory inode.
414 * cache[1] tries to cache the location of the object data.
415 * The assumption is that it is near the directory data.
417 hammer_cache_node(&ip->cache[0], cursor.node);
418 if (dip && dip->cache[1].node)
419 hammer_cache_node(&ip->cache[1], dip->cache[1].node);
422 * The file should not contain any data past the file size
423 * stored in the inode. Setting save_trunc_off to the
424 * file size instead of max reduces B-Tree lookup overheads
425 * on append by allowing the flusher to avoid checking for
428 ip->save_trunc_off = ip->ino_data.size;
431 * Locate and assign the pseudofs management structure to
434 if (dip && dip->obj_localization == ip->obj_localization) {
435 ip->pfsm = dip->pfsm;
436 hammer_ref(&ip->pfsm->lock);
438 ip->pfsm = hammer_load_pseudofs(trans,
439 ip->obj_localization,
441 *errorp = 0; /* ignore ENOENT */
446 * The inode is placed on the red-black tree and will be synced to
447 * the media when flushed or by the filesystem sync. If this races
448 * another instantiation/lookup the insertion will fail.
451 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
452 hammer_free_inode(ip);
453 hammer_done_cursor(&cursor);
456 ip->flags |= HAMMER_INODE_ONDISK;
458 if (ip->flags & HAMMER_INODE_RSV_INODES) {
459 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
463 hammer_free_inode(ip);
466 hammer_done_cursor(&cursor);
471 * Create a new filesystem object, returning the inode in *ipp. The
472 * returned inode will be referenced. The inode is created in-memory.
474 * If pfsm is non-NULL the caller wishes to create the root inode for
478 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
479 struct ucred *cred, hammer_inode_t dip,
480 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp)
489 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
490 ++hammer_count_inodes;
494 KKASSERT(pfsm->localization != 0);
495 ip->obj_id = HAMMER_OBJID_ROOT;
496 ip->obj_localization = pfsm->localization;
498 KKASSERT(dip != NULL);
499 ip->obj_id = hammer_alloc_objid(hmp, dip);
500 ip->obj_localization = dip->obj_localization;
503 KKASSERT(ip->obj_id != 0);
504 ip->obj_asof = hmp->asof;
506 ip->flush_state = HAMMER_FST_IDLE;
507 ip->flags = HAMMER_INODE_DDIRTY |
508 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME;
509 ip->cache[0].ip = ip;
510 ip->cache[1].ip = ip;
512 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
513 /* ip->save_trunc_off = 0; (already zero) */
514 RB_INIT(&ip->rec_tree);
515 TAILQ_INIT(&ip->target_list);
517 ip->ino_data.atime = trans->time;
518 ip->ino_data.mtime = trans->time;
519 ip->ino_data.size = 0;
520 ip->ino_data.nlinks = 0;
523 * A nohistory designator on the parent directory is inherited by
524 * the child. We will do this even for pseudo-fs creation... the
525 * sysad can turn it off.
528 ip->ino_data.uflags = dip->ino_data.uflags &
529 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
532 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
533 ip->ino_leaf.base.localization = ip->obj_localization +
534 HAMMER_LOCALIZE_INODE;
535 ip->ino_leaf.base.obj_id = ip->obj_id;
536 ip->ino_leaf.base.key = 0;
537 ip->ino_leaf.base.create_tid = 0;
538 ip->ino_leaf.base.delete_tid = 0;
539 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
540 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
542 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
543 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
544 ip->ino_data.mode = vap->va_mode;
545 ip->ino_data.ctime = trans->time;
548 * Setup the ".." pointer. This only needs to be done for directories
549 * but we do it for all objects as a recovery aid.
552 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id;
555 * The parent_obj_localization field only applies to pseudo-fs roots.
556 * XXX this is no longer applicable, PFSs are no longer directly
557 * tied into the parent's directory structure.
559 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY &&
560 ip->obj_id == HAMMER_OBJID_ROOT) {
561 ip->ino_data.ext.obj.parent_obj_localization =
562 dip->obj_localization;
566 switch(ip->ino_leaf.base.obj_type) {
567 case HAMMER_OBJTYPE_CDEV:
568 case HAMMER_OBJTYPE_BDEV:
569 ip->ino_data.rmajor = vap->va_rmajor;
570 ip->ino_data.rminor = vap->va_rminor;
577 * Calculate default uid/gid and overwrite with information from
581 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
582 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode,
583 xuid, cred, &vap->va_mode);
587 ip->ino_data.mode = vap->va_mode;
589 if (vap->va_vaflags & VA_UID_UUID_VALID)
590 ip->ino_data.uid = vap->va_uid_uuid;
591 else if (vap->va_uid != (uid_t)VNOVAL)
592 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
594 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
596 if (vap->va_vaflags & VA_GID_UUID_VALID)
597 ip->ino_data.gid = vap->va_gid_uuid;
598 else if (vap->va_gid != (gid_t)VNOVAL)
599 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
601 ip->ino_data.gid = dip->ino_data.gid;
603 hammer_ref(&ip->lock);
607 hammer_ref(&pfsm->lock);
609 } else if (dip->obj_localization == ip->obj_localization) {
610 ip->pfsm = dip->pfsm;
611 hammer_ref(&ip->pfsm->lock);
614 ip->pfsm = hammer_load_pseudofs(trans,
615 ip->obj_localization,
617 error = 0; /* ignore ENOENT */
621 hammer_free_inode(ip);
623 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
624 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id);
626 hammer_free_inode(ip);
633 * Final cleanup / freeing of an inode structure
636 hammer_free_inode(hammer_inode_t ip)
638 KKASSERT(ip->lock.refs == 1);
639 hammer_uncache_node(&ip->cache[0]);
640 hammer_uncache_node(&ip->cache[1]);
641 hammer_inode_wakereclaims(ip);
643 hammer_clear_objid(ip);
644 --hammer_count_inodes;
645 --ip->hmp->count_inodes;
647 hammer_rel_pseudofs(ip->hmp, ip->pfsm);
655 * Retrieve pseudo-fs data. NULL will never be returned.
657 * If an error occurs *errorp will be set and a default template is returned,
658 * otherwise *errorp is set to 0. Typically when an error occurs it will
661 hammer_pseudofs_inmem_t
662 hammer_load_pseudofs(hammer_transaction_t trans,
663 u_int32_t localization, int *errorp)
665 hammer_mount_t hmp = trans->hmp;
667 hammer_pseudofs_inmem_t pfsm;
668 struct hammer_cursor cursor;
672 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization);
674 hammer_ref(&pfsm->lock);
680 * PFS records are stored in the root inode (not the PFS root inode,
681 * but the real root). Avoid an infinite recursion if loading
682 * the PFS for the real root.
685 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT,
687 HAMMER_DEF_LOCALIZATION, 0, errorp);
692 pfsm = kmalloc(sizeof(*pfsm), M_HAMMER, M_WAITOK | M_ZERO);
693 pfsm->localization = localization;
694 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid;
695 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid;
697 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip);
698 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION +
699 HAMMER_LOCALIZE_MISC;
700 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
701 cursor.key_beg.create_tid = 0;
702 cursor.key_beg.delete_tid = 0;
703 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
704 cursor.key_beg.obj_type = 0;
705 cursor.key_beg.key = localization;
706 cursor.asof = HAMMER_MAX_TID;
707 cursor.flags |= HAMMER_CURSOR_ASOF;
710 *errorp = hammer_ip_lookup(&cursor);
712 *errorp = hammer_btree_lookup(&cursor);
714 *errorp = hammer_ip_resolve_data(&cursor);
716 bytes = cursor.leaf->data_len;
717 if (bytes > sizeof(pfsm->pfsd))
718 bytes = sizeof(pfsm->pfsd);
719 bcopy(cursor.data, &pfsm->pfsd, bytes);
722 hammer_done_cursor(&cursor);
724 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
725 hammer_ref(&pfsm->lock);
727 hammer_rel_inode(ip, 0);
728 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) {
729 kfree(pfsm, M_HAMMER);
736 * Store pseudo-fs data. The backend will automatically delete any prior
737 * on-disk pseudo-fs data but we have to delete in-memory versions.
740 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm)
742 struct hammer_cursor cursor;
743 hammer_record_t record;
747 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
748 HAMMER_DEF_LOCALIZATION, 0, &error);
750 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
751 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
752 cursor.key_beg.localization = ip->obj_localization +
753 HAMMER_LOCALIZE_MISC;
754 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
755 cursor.key_beg.create_tid = 0;
756 cursor.key_beg.delete_tid = 0;
757 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
758 cursor.key_beg.obj_type = 0;
759 cursor.key_beg.key = pfsm->localization;
760 cursor.asof = HAMMER_MAX_TID;
761 cursor.flags |= HAMMER_CURSOR_ASOF;
763 error = hammer_ip_lookup(&cursor);
764 if (error == 0 && hammer_cursor_inmem(&cursor)) {
765 record = cursor.iprec;
766 if (record->flags & HAMMER_RECF_INTERLOCK_BE) {
767 KKASSERT(cursor.deadlk_rec == NULL);
768 hammer_ref(&record->lock);
769 cursor.deadlk_rec = record;
772 record->flags |= HAMMER_RECF_DELETED_FE;
776 if (error == 0 || error == ENOENT) {
777 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd));
778 record->type = HAMMER_MEM_RECORD_GENERAL;
780 record->leaf.base.localization = ip->obj_localization +
781 HAMMER_LOCALIZE_MISC;
782 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS;
783 record->leaf.base.key = pfsm->localization;
784 record->leaf.data_len = sizeof(pfsm->pfsd);
785 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd));
786 error = hammer_ip_add_record(trans, record);
788 hammer_done_cursor(&cursor);
789 if (error == EDEADLK)
791 hammer_rel_inode(ip, 0);
796 * Create a root directory for a PFS if one does not alredy exist.
798 * The PFS root stands alone so we must also bump the nlinks count
799 * to prevent it from being destroyed on release.
802 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred,
803 hammer_pseudofs_inmem_t pfsm)
809 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
810 pfsm->localization, 0, &error);
815 error = hammer_create_inode(trans, &vap, cred, NULL, pfsm, &ip);
817 ++ip->ino_data.nlinks;
818 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
822 hammer_rel_inode(ip, 0);
827 * Release a reference on a PFS
830 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm)
832 hammer_unref(&pfsm->lock);
833 if (pfsm->lock.refs == 0) {
834 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm);
835 kfree(pfsm, M_HAMMER);
840 * Called by hammer_sync_inode().
843 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
845 hammer_transaction_t trans = cursor->trans;
846 hammer_record_t record;
854 * If the inode has a presence on-disk then locate it and mark
855 * it deleted, setting DELONDISK.
857 * The record may or may not be physically deleted, depending on
858 * the retention policy.
860 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
861 HAMMER_INODE_ONDISK) {
862 hammer_normalize_cursor(cursor);
863 cursor->key_beg.localization = ip->obj_localization +
864 HAMMER_LOCALIZE_INODE;
865 cursor->key_beg.obj_id = ip->obj_id;
866 cursor->key_beg.key = 0;
867 cursor->key_beg.create_tid = 0;
868 cursor->key_beg.delete_tid = 0;
869 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
870 cursor->key_beg.obj_type = 0;
871 cursor->asof = ip->obj_asof;
872 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
873 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
874 cursor->flags |= HAMMER_CURSOR_BACKEND;
876 error = hammer_btree_lookup(cursor);
877 if (hammer_debug_inode)
878 kprintf("IPDEL %p %08x %d", ip, ip->flags, error);
880 kprintf("error %d\n", error);
881 Debugger("hammer_update_inode");
885 error = hammer_ip_delete_record(cursor, ip, trans->tid);
886 if (hammer_debug_inode)
887 kprintf(" error %d\n", error);
888 if (error && error != EDEADLK) {
889 kprintf("error %d\n", error);
890 Debugger("hammer_update_inode2");
893 ip->flags |= HAMMER_INODE_DELONDISK;
896 hammer_cache_node(&ip->cache[0], cursor->node);
898 if (error == EDEADLK) {
899 hammer_done_cursor(cursor);
900 error = hammer_init_cursor(trans, cursor,
902 if (hammer_debug_inode)
903 kprintf("IPDED %p %d\n", ip, error);
910 * Ok, write out the initial record or a new record (after deleting
911 * the old one), unless the DELETED flag is set. This routine will
912 * clear DELONDISK if it writes out a record.
914 * Update our inode statistics if this is the first application of
917 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
919 * Generate a record and write it to the media
921 record = hammer_alloc_mem_record(ip, 0);
922 record->type = HAMMER_MEM_RECORD_INODE;
923 record->flush_state = HAMMER_FST_FLUSH;
924 record->leaf = ip->sync_ino_leaf;
925 record->leaf.base.create_tid = trans->tid;
926 record->leaf.data_len = sizeof(ip->sync_ino_data);
927 record->leaf.create_ts = trans->time32;
928 record->data = (void *)&ip->sync_ino_data;
929 record->flags |= HAMMER_RECF_INTERLOCK_BE;
932 * If this flag is set we cannot sync the new file size
933 * because we haven't finished related truncations. The
934 * inode will be flushed in another flush group to finish
937 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) &&
938 ip->sync_ino_data.size != ip->ino_data.size) {
940 ip->sync_ino_data.size = ip->ino_data.size;
946 error = hammer_ip_sync_record_cursor(cursor, record);
947 if (hammer_debug_inode)
948 kprintf("GENREC %p rec %08x %d\n",
949 ip, record->flags, error);
950 if (error != EDEADLK)
952 hammer_done_cursor(cursor);
953 error = hammer_init_cursor(trans, cursor,
955 if (hammer_debug_inode)
956 kprintf("GENREC reinit %d\n", error);
961 kprintf("error %d\n", error);
962 Debugger("hammer_update_inode3");
966 * The record isn't managed by the inode's record tree,
967 * destroy it whether we succeed or fail.
969 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
970 record->flags |= HAMMER_RECF_DELETED_FE;
971 record->flush_state = HAMMER_FST_IDLE;
972 hammer_rel_mem_record(record);
978 if (hammer_debug_inode)
979 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
980 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
983 ip->flags &= ~HAMMER_INODE_DELONDISK;
985 ip->sync_flags |= HAMMER_INODE_DDIRTY;
988 * Root volume count of inodes
990 hammer_sync_lock_sh(trans);
991 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
992 hammer_modify_volume_field(trans,
995 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
996 hammer_modify_volume_done(trans->rootvol);
997 ip->flags |= HAMMER_INODE_ONDISK;
998 if (hammer_debug_inode)
999 kprintf("NOWONDISK %p\n", ip);
1001 hammer_sync_unlock(trans);
1006 * If the inode has been destroyed, clean out any left-over flags
1007 * that may have been set by the frontend.
1009 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
1010 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1011 HAMMER_INODE_ATIME |
1012 HAMMER_INODE_MTIME);
1018 * Update only the itimes fields.
1020 * ATIME can be updated without generating any UNDO. MTIME is updated
1021 * with UNDO so it is guaranteed to be synchronized properly in case of
1024 * Neither field is included in the B-Tree leaf element's CRC, which is how
1025 * we can get away with updating ATIME the way we do.
1028 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
1030 hammer_transaction_t trans = cursor->trans;
1034 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) !=
1035 HAMMER_INODE_ONDISK) {
1039 hammer_normalize_cursor(cursor);
1040 cursor->key_beg.localization = ip->obj_localization +
1041 HAMMER_LOCALIZE_INODE;
1042 cursor->key_beg.obj_id = ip->obj_id;
1043 cursor->key_beg.key = 0;
1044 cursor->key_beg.create_tid = 0;
1045 cursor->key_beg.delete_tid = 0;
1046 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1047 cursor->key_beg.obj_type = 0;
1048 cursor->asof = ip->obj_asof;
1049 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1050 cursor->flags |= HAMMER_CURSOR_ASOF;
1051 cursor->flags |= HAMMER_CURSOR_GET_LEAF;
1052 cursor->flags |= HAMMER_CURSOR_GET_DATA;
1053 cursor->flags |= HAMMER_CURSOR_BACKEND;
1055 error = hammer_btree_lookup(cursor);
1057 kprintf("error %d\n", error);
1058 Debugger("hammer_update_itimes1");
1061 hammer_cache_node(&ip->cache[0], cursor->node);
1062 if (ip->sync_flags & HAMMER_INODE_MTIME) {
1064 * Updating MTIME requires an UNDO. Just cover
1065 * both atime and mtime.
1067 hammer_sync_lock_sh(trans);
1068 hammer_modify_buffer(trans, cursor->data_buffer,
1069 HAMMER_ITIMES_BASE(&cursor->data->inode),
1070 HAMMER_ITIMES_BYTES);
1071 cursor->data->inode.atime = ip->sync_ino_data.atime;
1072 cursor->data->inode.mtime = ip->sync_ino_data.mtime;
1073 hammer_modify_buffer_done(cursor->data_buffer);
1074 hammer_sync_unlock(trans);
1075 } else if (ip->sync_flags & HAMMER_INODE_ATIME) {
1077 * Updating atime only can be done in-place with
1080 hammer_sync_lock_sh(trans);
1081 hammer_modify_buffer(trans, cursor->data_buffer,
1083 cursor->data->inode.atime = ip->sync_ino_data.atime;
1084 hammer_modify_buffer_done(cursor->data_buffer);
1085 hammer_sync_unlock(trans);
1087 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME);
1089 if (error == EDEADLK) {
1090 hammer_done_cursor(cursor);
1091 error = hammer_init_cursor(trans, cursor,
1100 * Release a reference on an inode, flush as requested.
1102 * On the last reference we queue the inode to the flusher for its final
1106 hammer_rel_inode(struct hammer_inode *ip, int flush)
1108 hammer_mount_t hmp = ip->hmp;
1111 * Handle disposition when dropping the last ref.
1114 if (ip->lock.refs == 1) {
1116 * Determine whether on-disk action is needed for
1117 * the inode's final disposition.
1119 KKASSERT(ip->vp == NULL);
1120 hammer_inode_unloadable_check(ip, 0);
1121 if (ip->flags & HAMMER_INODE_MODMASK) {
1122 if (hmp->rsv_inodes > desiredvnodes) {
1123 hammer_flush_inode(ip,
1124 HAMMER_FLUSH_SIGNAL);
1126 hammer_flush_inode(ip, 0);
1128 } else if (ip->lock.refs == 1) {
1129 hammer_unload_inode(ip);
1134 hammer_flush_inode(ip, 0);
1137 * The inode still has multiple refs, try to drop
1140 KKASSERT(ip->lock.refs >= 1);
1141 if (ip->lock.refs > 1) {
1142 hammer_unref(&ip->lock);
1150 * Unload and destroy the specified inode. Must be called with one remaining
1151 * reference. The reference is disposed of.
1153 * This can only be called in the context of the flusher.
1156 hammer_unload_inode(struct hammer_inode *ip)
1158 hammer_mount_t hmp = ip->hmp;
1160 KASSERT(ip->lock.refs == 1,
1161 ("hammer_unload_inode: %d refs\n", ip->lock.refs));
1162 KKASSERT(ip->vp == NULL);
1163 KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
1164 KKASSERT(ip->cursor_ip_refs == 0);
1165 KKASSERT(ip->lock.lockcount == 0);
1166 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
1168 KKASSERT(RB_EMPTY(&ip->rec_tree));
1169 KKASSERT(TAILQ_EMPTY(&ip->target_list));
1171 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
1173 hammer_free_inode(ip);
1178 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1179 * the read-only flag for cached inodes.
1181 * This routine is called from a RB_SCAN().
1184 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
1186 hammer_mount_t hmp = ip->hmp;
1188 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
1189 ip->flags |= HAMMER_INODE_RO;
1191 ip->flags &= ~HAMMER_INODE_RO;
1196 * A transaction has modified an inode, requiring updates as specified by
1199 * HAMMER_INODE_DDIRTY: Inode data has been updated
1200 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1201 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1202 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1203 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1206 hammer_modify_inode(hammer_inode_t ip, int flags)
1208 KKASSERT(ip->hmp->ronly == 0 ||
1209 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
1210 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED |
1211 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0);
1212 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
1213 ip->flags |= HAMMER_INODE_RSV_INODES;
1214 ++ip->hmp->rsv_inodes;
1221 * Request that an inode be flushed. This whole mess cannot block and may
1222 * recurse (if not synchronous). Once requested HAMMER will attempt to
1223 * actively flush the inode until the flush can be done.
1225 * The inode may already be flushing, or may be in a setup state. We can
1226 * place the inode in a flushing state if it is currently idle and flag it
1227 * to reflush if it is currently flushing.
1229 * If the HAMMER_FLUSH_SYNCHRONOUS flag is specified we will attempt to
1230 * flush the indoe synchronously using the caller's context.
1233 hammer_flush_inode(hammer_inode_t ip, int flags)
1238 * Trivial 'nothing to flush' case. If the inode is ina SETUP
1239 * state we have to put it back into an IDLE state so we can
1240 * drop the extra ref.
1242 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
1243 if (ip->flush_state == HAMMER_FST_SETUP) {
1244 ip->flush_state = HAMMER_FST_IDLE;
1245 hammer_rel_inode(ip, 0);
1251 * Our flush action will depend on the current state.
1253 switch(ip->flush_state) {
1254 case HAMMER_FST_IDLE:
1256 * We have no dependancies and can flush immediately. Some
1257 * our children may not be flushable so we have to re-test
1258 * with that additional knowledge.
1260 hammer_flush_inode_core(ip, flags);
1262 case HAMMER_FST_SETUP:
1264 * Recurse upwards through dependancies via target_list
1265 * and start their flusher actions going if possible.
1267 * 'good' is our connectivity. -1 means we have none and
1268 * can't flush, 0 means there weren't any dependancies, and
1269 * 1 means we have good connectivity.
1271 good = hammer_setup_parent_inodes(ip);
1274 * We can continue if good >= 0. Determine how many records
1275 * under our inode can be flushed (and mark them).
1278 hammer_flush_inode_core(ip, flags);
1280 ip->flags |= HAMMER_INODE_REFLUSH;
1281 if (flags & HAMMER_FLUSH_SIGNAL) {
1282 ip->flags |= HAMMER_INODE_RESIGNAL;
1283 hammer_flusher_async(ip->hmp);
1289 * We are already flushing, flag the inode to reflush
1290 * if needed after it completes its current flush.
1292 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
1293 ip->flags |= HAMMER_INODE_REFLUSH;
1294 if (flags & HAMMER_FLUSH_SIGNAL) {
1295 ip->flags |= HAMMER_INODE_RESIGNAL;
1296 hammer_flusher_async(ip->hmp);
1303 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1304 * ip which reference our ip.
1306 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1307 * so for now do not ref/deref the structures. Note that if we use the
1308 * ref/rel code later, the rel CAN block.
1311 hammer_setup_parent_inodes(hammer_inode_t ip)
1313 hammer_record_t depend;
1315 hammer_record_t next;
1322 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
1323 r = hammer_setup_parent_inodes_helper(depend);
1324 KKASSERT(depend->target_ip == ip);
1325 if (r < 0 && good == 0)
1335 next = TAILQ_FIRST(&ip->target_list);
1337 hammer_ref(&next->lock);
1338 hammer_ref(&next->ip->lock);
1340 while ((depend = next) != NULL) {
1341 if (depend->target_ip == NULL) {
1343 hammer_rel_mem_record(depend);
1344 hammer_rel_inode(pip, 0);
1347 KKASSERT(depend->target_ip == ip);
1348 next = TAILQ_NEXT(depend, target_entry);
1350 hammer_ref(&next->lock);
1351 hammer_ref(&next->ip->lock);
1353 r = hammer_setup_parent_inodes_helper(depend);
1354 if (r < 0 && good == 0)
1359 hammer_rel_mem_record(depend);
1360 hammer_rel_inode(pip, 0);
1367 * This helper function takes a record representing the dependancy between
1368 * the parent inode and child inode.
1370 * record->ip = parent inode
1371 * record->target_ip = child inode
1373 * We are asked to recurse upwards and convert the record from SETUP
1374 * to FLUSH if possible.
1376 * Return 1 if the record gives us connectivity
1378 * Return 0 if the record is not relevant
1380 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1383 hammer_setup_parent_inodes_helper(hammer_record_t record)
1389 KKASSERT(record->flush_state != HAMMER_FST_IDLE);
1394 * If the record is already flushing, is it in our flush group?
1396 * If it is in our flush group but it is a general record or a
1397 * delete-on-disk, it does not improve our connectivity (return 0),
1398 * and if the target inode is not trying to destroy itself we can't
1399 * allow the operation yet anyway (the second return -1).
1401 if (record->flush_state == HAMMER_FST_FLUSH) {
1402 if (record->flush_group != hmp->flusher.next) {
1403 pip->flags |= HAMMER_INODE_REFLUSH;
1406 if (record->type == HAMMER_MEM_RECORD_ADD)
1408 /* GENERAL or DEL */
1413 * It must be a setup record. Try to resolve the setup dependancies
1414 * by recursing upwards so we can place ip on the flush list.
1416 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1418 good = hammer_setup_parent_inodes(pip);
1421 * We can't flush ip because it has no connectivity (XXX also check
1422 * nlinks for pre-existing connectivity!). Flag it so any resolution
1423 * recurses back down.
1426 pip->flags |= HAMMER_INODE_REFLUSH;
1431 * We are go, place the parent inode in a flushing state so we can
1432 * place its record in a flushing state. Note that the parent
1433 * may already be flushing. The record must be in the same flush
1434 * group as the parent.
1436 if (pip->flush_state != HAMMER_FST_FLUSH)
1437 hammer_flush_inode_core(pip, HAMMER_FLUSH_RECURSION);
1438 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH);
1439 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1442 if (record->type == HAMMER_MEM_RECORD_DEL &&
1443 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
1445 * Regardless of flushing state we cannot sync this path if the
1446 * record represents a delete-on-disk but the target inode
1447 * is not ready to sync its own deletion.
1449 * XXX need to count effective nlinks to determine whether
1450 * the flush is ok, otherwise removing a hardlink will
1451 * just leave the DEL record to rot.
1453 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
1457 if (pip->flush_group == pip->hmp->flusher.next) {
1459 * This is the record we wanted to synchronize. If the
1460 * record went into a flush state while we blocked it
1461 * had better be in the correct flush group.
1463 if (record->flush_state != HAMMER_FST_FLUSH) {
1464 record->flush_state = HAMMER_FST_FLUSH;
1465 record->flush_group = pip->flush_group;
1466 hammer_ref(&record->lock);
1468 KKASSERT(record->flush_group == pip->flush_group);
1470 if (record->type == HAMMER_MEM_RECORD_ADD)
1474 * A general or delete-on-disk record does not contribute
1475 * to our visibility. We can still flush it, however.
1480 * We couldn't resolve the dependancies, request that the
1481 * inode be flushed when the dependancies can be resolved.
1483 pip->flags |= HAMMER_INODE_REFLUSH;
1489 * This is the core routine placing an inode into the FST_FLUSH state.
1492 hammer_flush_inode_core(hammer_inode_t ip, int flags)
1497 * Set flush state and prevent the flusher from cycling into
1498 * the next flush group. Do not place the ip on the list yet.
1499 * Inodes not in the idle state get an extra reference.
1501 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
1502 if (ip->flush_state == HAMMER_FST_IDLE)
1503 hammer_ref(&ip->lock);
1504 ip->flush_state = HAMMER_FST_FLUSH;
1505 ip->flush_group = ip->hmp->flusher.next;
1506 ++ip->hmp->flusher.group_lock;
1507 ++ip->hmp->count_iqueued;
1508 ++hammer_count_iqueued;
1511 * We need to be able to vfsync/truncate from the backend.
1513 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
1514 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
1515 ip->flags |= HAMMER_INODE_VHELD;
1520 * Figure out how many in-memory records we can actually flush
1521 * (not including inode meta-data, buffers, etc).
1523 * Do not add new records to the flush if this is a recursion or
1524 * if we must still complete a flush from the previous flush cycle.
1526 if (flags & HAMMER_FLUSH_RECURSION) {
1528 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
1529 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1530 hammer_syncgrp_child_callback, NULL);
1533 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1534 hammer_setup_child_callback, NULL);
1538 * This is a more involved test that includes go_count. If we
1539 * can't flush, flag the inode and return. If go_count is 0 we
1540 * were are unable to flush any records in our rec_tree and
1541 * must ignore the XDIRTY flag.
1543 if (go_count == 0) {
1544 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
1545 ip->flags |= HAMMER_INODE_REFLUSH;
1547 --ip->hmp->count_iqueued;
1548 --hammer_count_iqueued;
1550 ip->flush_state = HAMMER_FST_SETUP;
1551 if (ip->flags & HAMMER_INODE_VHELD) {
1552 ip->flags &= ~HAMMER_INODE_VHELD;
1555 if (flags & HAMMER_FLUSH_SIGNAL) {
1556 ip->flags |= HAMMER_INODE_RESIGNAL;
1557 hammer_flusher_async(ip->hmp);
1559 if (--ip->hmp->flusher.group_lock == 0)
1560 wakeup(&ip->hmp->flusher.group_lock);
1566 * Snapshot the state of the inode for the backend flusher.
1568 * We continue to retain save_trunc_off even when all truncations
1569 * have been resolved as an optimization to determine if we can
1570 * skip the B-Tree lookup for overwrite deletions.
1572 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
1573 * and stays in ip->flags. Once set, it stays set until the
1574 * inode is destroyed.
1576 * NOTE: If a truncation from a previous flush cycle had to be
1577 * continued into this one, the TRUNCATED flag will still be
1578 * set in sync_flags as will WOULDBLOCK. When this occurs
1579 * we CANNOT safely integrate a new truncation from the front-end
1580 * because there may be data records in-memory assigned a flush
1581 * state from the previous cycle that are supposed to be flushed
1582 * before the next frontend truncation.
1584 if ((ip->flags & (HAMMER_INODE_TRUNCATED | HAMMER_INODE_WOULDBLOCK)) ==
1585 HAMMER_INODE_TRUNCATED) {
1586 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0);
1587 ip->sync_trunc_off = ip->trunc_off;
1588 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
1589 ip->flags &= ~HAMMER_INODE_TRUNCATED;
1590 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
1593 * The save_trunc_off used to cache whether the B-Tree
1594 * holds any records past that point is not used until
1595 * after the truncation has succeeded, so we can safely
1598 if (ip->save_trunc_off > ip->sync_trunc_off)
1599 ip->save_trunc_off = ip->sync_trunc_off;
1601 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK &
1602 ~HAMMER_INODE_TRUNCATED);
1603 ip->sync_ino_leaf = ip->ino_leaf;
1604 ip->sync_ino_data = ip->ino_data;
1605 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED;
1606 #ifdef DEBUG_TRUNCATE
1607 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp)
1608 kprintf("truncateS %016llx\n", ip->sync_trunc_off);
1612 * The flusher list inherits our inode and reference.
1614 TAILQ_INSERT_TAIL(&ip->hmp->flush_list, ip, flush_entry);
1615 if (--ip->hmp->flusher.group_lock == 0)
1616 wakeup(&ip->hmp->flusher.group_lock);
1618 if (flags & HAMMER_FLUSH_SIGNAL) {
1619 hammer_flusher_async(ip->hmp);
1624 * Callback for scan of ip->rec_tree. Try to include each record in our
1625 * flush. ip->flush_group has been set but the inode has not yet been
1626 * moved into a flushing state.
1628 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
1631 * We return 1 for any record placed or found in FST_FLUSH, which prevents
1632 * the caller from shortcutting the flush.
1635 hammer_setup_child_callback(hammer_record_t rec, void *data)
1637 hammer_inode_t target_ip;
1642 * Deleted records are ignored. Note that the flush detects deleted
1643 * front-end records at multiple points to deal with races. This is
1644 * just the first line of defense. The only time DELETED_FE cannot
1645 * be set is when HAMMER_RECF_INTERLOCK_BE is set.
1647 * Don't get confused between record deletion and, say, directory
1648 * entry deletion. The deletion of a directory entry that is on
1649 * the media has nothing to do with the record deletion flags.
1651 * The flush_group for a record already in a flush state must
1652 * be updated. This case can only occur if the inode deleting
1653 * too many records had to be moved to the next flush group.
1655 if (rec->flags & (HAMMER_RECF_DELETED_FE|HAMMER_RECF_DELETED_BE)) {
1656 if (rec->flush_state == HAMMER_FST_FLUSH) {
1657 KKASSERT(rec->ip->flags & HAMMER_INODE_WOULDBLOCK);
1658 rec->flush_group = rec->ip->flush_group;
1667 * If the record is in an idle state it has no dependancies and
1673 switch(rec->flush_state) {
1674 case HAMMER_FST_IDLE:
1676 * Record has no setup dependancy, we can flush it.
1678 KKASSERT(rec->target_ip == NULL);
1679 rec->flush_state = HAMMER_FST_FLUSH;
1680 rec->flush_group = ip->flush_group;
1681 hammer_ref(&rec->lock);
1684 case HAMMER_FST_SETUP:
1686 * Record has a setup dependancy. Try to include the
1687 * target ip in the flush.
1689 * We have to be careful here, if we do not do the right
1690 * thing we can lose track of dirty inodes and the system
1691 * will lockup trying to allocate buffers.
1693 target_ip = rec->target_ip;
1694 KKASSERT(target_ip != NULL);
1695 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
1696 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
1698 * If the target IP is already flushing in our group
1699 * we are golden, otherwise make sure the target
1702 if (target_ip->flush_group == ip->flush_group) {
1703 rec->flush_state = HAMMER_FST_FLUSH;
1704 rec->flush_group = ip->flush_group;
1705 hammer_ref(&rec->lock);
1708 target_ip->flags |= HAMMER_INODE_REFLUSH;
1710 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
1712 * If the target IP is not flushing we can force
1713 * it to flush, even if it is unable to write out
1714 * any of its own records we have at least one in
1715 * hand that we CAN deal with.
1717 rec->flush_state = HAMMER_FST_FLUSH;
1718 rec->flush_group = ip->flush_group;
1719 hammer_ref(&rec->lock);
1720 hammer_flush_inode_core(target_ip,
1721 HAMMER_FLUSH_RECURSION);
1725 * General or delete-on-disk record.
1727 * XXX this needs help. If a delete-on-disk we could
1728 * disconnect the target. If the target has its own
1729 * dependancies they really need to be flushed.
1733 rec->flush_state = HAMMER_FST_FLUSH;
1734 rec->flush_group = ip->flush_group;
1735 hammer_ref(&rec->lock);
1736 hammer_flush_inode_core(target_ip,
1737 HAMMER_FLUSH_RECURSION);
1741 case HAMMER_FST_FLUSH:
1743 * If the WOULDBLOCK flag is set records may have been left
1744 * over from a previous flush attempt and should be moved
1745 * to the current flush group. If it is not set then all
1746 * such records had better have been flushed already or
1747 * already associated with the current flush group.
1749 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
1750 rec->flush_group = ip->flush_group;
1752 KKASSERT(rec->flush_group == ip->flush_group);
1761 * This version just moves records already in a flush state to the new
1762 * flush group and that is it.
1765 hammer_syncgrp_child_callback(hammer_record_t rec, void *data)
1767 hammer_inode_t ip = rec->ip;
1769 switch(rec->flush_state) {
1770 case HAMMER_FST_FLUSH:
1771 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
1772 rec->flush_group = ip->flush_group;
1774 KKASSERT(rec->flush_group == ip->flush_group);
1784 * Wait for a previously queued flush to complete. Not only do we need to
1785 * wait for the inode to sync out, we also may have to run the flusher again
1786 * to get it past the UNDO position pertaining to the flush so a crash does
1787 * not 'undo' our flush.
1790 hammer_wait_inode(hammer_inode_t ip)
1792 hammer_mount_t hmp = ip->hmp;
1796 sync_group = ip->flush_group;
1797 waitcount = (ip->flags & HAMMER_INODE_REFLUSH) ? 2 : 1;
1799 if (ip->flush_state == HAMMER_FST_SETUP) {
1800 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
1802 /* XXX can we make this != FST_IDLE ? check SETUP depends */
1803 while (ip->flush_state == HAMMER_FST_FLUSH &&
1804 (ip->flush_group - sync_group) < waitcount) {
1805 ip->flags |= HAMMER_INODE_FLUSHW;
1806 tsleep(&ip->flags, 0, "hmrwin", 0);
1808 while (hmp->flusher.done - sync_group < waitcount) {
1810 hammer_flusher_sync(hmp);
1815 * Called by the backend code when a flush has been completed.
1816 * The inode has already been removed from the flush list.
1818 * A pipelined flush can occur, in which case we must re-enter the
1819 * inode on the list and re-copy its fields.
1822 hammer_flush_inode_done(hammer_inode_t ip)
1827 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
1832 * Merge left-over flags back into the frontend and fix the state.
1833 * Incomplete truncations are retained by the backend.
1835 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED;
1836 ip->sync_flags &= HAMMER_INODE_TRUNCATED;
1839 * The backend may have adjusted nlinks, so if the adjusted nlinks
1840 * does not match the fronttend set the frontend's RDIRTY flag again.
1842 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
1843 ip->flags |= HAMMER_INODE_DDIRTY;
1846 * Fix up the dirty buffer status.
1848 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
1849 ip->flags |= HAMMER_INODE_BUFS;
1853 * Re-set the XDIRTY flag if some of the inode's in-memory records
1854 * could not be flushed.
1856 KKASSERT((RB_EMPTY(&ip->rec_tree) &&
1857 (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
1858 (!RB_EMPTY(&ip->rec_tree) &&
1859 (ip->flags & HAMMER_INODE_XDIRTY) != 0));
1862 * Do not lose track of inodes which no longer have vnode
1863 * assocations, otherwise they may never get flushed again.
1865 if ((ip->flags & HAMMER_INODE_MODMASK) && ip->vp == NULL)
1866 ip->flags |= HAMMER_INODE_REFLUSH;
1869 * Clean up the vnode ref
1871 if (ip->flags & HAMMER_INODE_VHELD) {
1872 ip->flags &= ~HAMMER_INODE_VHELD;
1877 * Adjust flush_state. The target state (idle or setup) shouldn't
1878 * be terribly important since we will reflush if we really need
1881 * If the WOULDBLOCK flag is set we must re-flush immediately
1882 * to continue a potentially large deletion. The flag also causes
1883 * the hammer_setup_child_callback() to move records in the old
1884 * flush group to the new one.
1886 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
1887 ip->flush_state = HAMMER_FST_IDLE;
1888 hammer_flush_inode_core(ip, HAMMER_FLUSH_SIGNAL);
1889 ip->flags &= ~HAMMER_INODE_WOULDBLOCK;
1891 } else if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
1892 ip->flush_state = HAMMER_FST_IDLE;
1895 ip->flush_state = HAMMER_FST_SETUP;
1899 --hmp->count_iqueued;
1900 --hammer_count_iqueued;
1903 * If the frontend made more changes and requested another flush,
1904 * then try to get it running.
1906 if (ip->flags & HAMMER_INODE_REFLUSH) {
1907 ip->flags &= ~HAMMER_INODE_REFLUSH;
1908 if (ip->flags & HAMMER_INODE_RESIGNAL) {
1909 ip->flags &= ~HAMMER_INODE_RESIGNAL;
1910 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
1912 hammer_flush_inode(ip, 0);
1917 * If the inode is now clean drop the space reservation.
1919 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
1920 (ip->flags & HAMMER_INODE_RSV_INODES)) {
1921 ip->flags &= ~HAMMER_INODE_RSV_INODES;
1926 * Finally, if the frontend is waiting for a flush to complete,
1929 if (ip->flush_state != HAMMER_FST_FLUSH) {
1930 if (ip->flags & HAMMER_INODE_FLUSHW) {
1931 ip->flags &= ~HAMMER_INODE_FLUSHW;
1936 hammer_rel_inode(ip, 0);
1940 * Called from hammer_sync_inode() to synchronize in-memory records
1944 hammer_sync_record_callback(hammer_record_t record, void *data)
1946 hammer_cursor_t cursor = data;
1947 hammer_transaction_t trans = cursor->trans;
1948 hammer_mount_t hmp = trans->hmp;
1952 * Skip records that do not belong to the current flush.
1954 ++hammer_stats_record_iterations;
1955 if (record->flush_state != HAMMER_FST_FLUSH)
1959 if (record->flush_group != record->ip->flush_group) {
1960 kprintf("sync_record %p ip %p bad flush group %d %d\n", record, record->ip, record->flush_group ,record->ip->flush_group);
1965 KKASSERT(record->flush_group == record->ip->flush_group);
1968 * Interlock the record using the BE flag. Once BE is set the
1969 * frontend cannot change the state of FE.
1971 * NOTE: If FE is set prior to us setting BE we still sync the
1972 * record out, but the flush completion code converts it to
1973 * a delete-on-disk record instead of destroying it.
1975 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
1976 record->flags |= HAMMER_RECF_INTERLOCK_BE;
1979 * The backend may have already disposed of the record.
1981 if (record->flags & HAMMER_RECF_DELETED_BE) {
1987 * If the whole inode is being deleting all on-disk records will
1988 * be deleted very soon, we can't sync any new records to disk
1989 * because they will be deleted in the same transaction they were
1990 * created in (delete_tid == create_tid), which will assert.
1992 * XXX There may be a case with RECORD_ADD with DELETED_FE set
1993 * that we currently panic on.
1995 if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
1996 switch(record->type) {
1997 case HAMMER_MEM_RECORD_DATA:
1999 * We don't have to do anything, if the record was
2000 * committed the space will have been accounted for
2004 case HAMMER_MEM_RECORD_GENERAL:
2005 record->flags |= HAMMER_RECF_DELETED_FE;
2006 record->flags |= HAMMER_RECF_DELETED_BE;
2009 case HAMMER_MEM_RECORD_ADD:
2010 panic("hammer_sync_record_callback: illegal add "
2011 "during inode deletion record %p", record);
2012 break; /* NOT REACHED */
2013 case HAMMER_MEM_RECORD_INODE:
2014 panic("hammer_sync_record_callback: attempt to "
2015 "sync inode record %p?", record);
2016 break; /* NOT REACHED */
2017 case HAMMER_MEM_RECORD_DEL:
2019 * Follow through and issue the on-disk deletion
2026 * If DELETED_FE is set special handling is needed for directory
2027 * entries. Dependant pieces related to the directory entry may
2028 * have already been synced to disk. If this occurs we have to
2029 * sync the directory entry and then change the in-memory record
2030 * from an ADD to a DELETE to cover the fact that it's been
2031 * deleted by the frontend.
2033 * A directory delete covering record (MEM_RECORD_DEL) can never
2034 * be deleted by the frontend.
2036 * Any other record type (aka DATA) can be deleted by the frontend.
2037 * XXX At the moment the flusher must skip it because there may
2038 * be another data record in the flush group for the same block,
2039 * meaning that some frontend data changes can leak into the backend's
2040 * synchronization point.
2042 if (record->flags & HAMMER_RECF_DELETED_FE) {
2043 if (record->type == HAMMER_MEM_RECORD_ADD) {
2044 record->flags |= HAMMER_RECF_CONVERT_DELETE;
2046 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
2047 record->flags |= HAMMER_RECF_DELETED_BE;
2054 * Assign the create_tid for new records. Deletions already
2055 * have the record's entire key properly set up.
2057 if (record->type != HAMMER_MEM_RECORD_DEL)
2058 record->leaf.base.create_tid = trans->tid;
2059 record->leaf.create_ts = trans->time32;
2061 error = hammer_ip_sync_record_cursor(cursor, record);
2062 if (error != EDEADLK)
2064 hammer_done_cursor(cursor);
2065 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
2070 record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
2074 if (error != -ENOSPC) {
2075 kprintf("hammer_sync_record_callback: sync failed rec "
2076 "%p, error %d\n", record, error);
2077 Debugger("sync failed rec");
2081 hammer_flush_record_done(record, error);
2084 * Do partial finalization if we have built up too many dirty
2085 * buffers. Otherwise a buffer cache deadlock can occur when
2086 * doing things like creating tens of thousands of tiny files.
2088 * The finalization lock is already being held by virtue of the
2089 * flusher calling us.
2091 if (hammer_flusher_meta_limit(hmp))
2092 hammer_flusher_finalize(trans, 0);
2098 * XXX error handling
2101 hammer_sync_inode(hammer_inode_t ip)
2103 struct hammer_transaction trans;
2104 struct hammer_cursor cursor;
2105 hammer_node_t tmp_node;
2106 hammer_record_t depend;
2107 hammer_record_t next;
2108 int error, tmp_error;
2111 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
2114 hammer_start_transaction_fls(&trans, ip->hmp);
2115 error = hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2120 * Any directory records referencing this inode which are not in
2121 * our current flush group must adjust our nlink count for the
2122 * purposes of synchronization to disk.
2124 * Records which are in our flush group can be unlinked from our
2125 * inode now, potentially allowing the inode to be physically
2128 * This cannot block.
2130 nlinks = ip->ino_data.nlinks;
2131 next = TAILQ_FIRST(&ip->target_list);
2132 while ((depend = next) != NULL) {
2133 next = TAILQ_NEXT(depend, target_entry);
2134 if (depend->flush_state == HAMMER_FST_FLUSH &&
2135 depend->flush_group == ip->hmp->flusher.act) {
2137 * If this is an ADD that was deleted by the frontend
2138 * the frontend nlinks count will have already been
2139 * decremented, but the backend is going to sync its
2140 * directory entry and must account for it. The
2141 * record will be converted to a delete-on-disk when
2144 * If the ADD was not deleted by the frontend we
2145 * can remove the dependancy from our target_list.
2147 if (depend->flags & HAMMER_RECF_DELETED_FE) {
2150 TAILQ_REMOVE(&ip->target_list, depend,
2152 depend->target_ip = NULL;
2154 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
2156 * Not part of our flush group
2158 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
2159 switch(depend->type) {
2160 case HAMMER_MEM_RECORD_ADD:
2163 case HAMMER_MEM_RECORD_DEL:
2173 * Set dirty if we had to modify the link count.
2175 if (ip->sync_ino_data.nlinks != nlinks) {
2176 KKASSERT((int64_t)nlinks >= 0);
2177 ip->sync_ino_data.nlinks = nlinks;
2178 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2182 * If there is a trunction queued destroy any data past the (aligned)
2183 * truncation point. Userland will have dealt with the buffer
2184 * containing the truncation point for us.
2186 * We don't flush pending frontend data buffers until after we've
2187 * dealt with the truncation.
2189 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2191 * Interlock trunc_off. The VOP front-end may continue to
2192 * make adjustments to it while we are blocked.
2195 off_t aligned_trunc_off;
2198 trunc_off = ip->sync_trunc_off;
2199 blkmask = hammer_blocksize(trunc_off) - 1;
2200 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask;
2203 * Delete any whole blocks on-media. The front-end has
2204 * already cleaned out any partial block and made it
2205 * pending. The front-end may have updated trunc_off
2206 * while we were blocked so we only use sync_trunc_off.
2208 * This operation can blow out the buffer cache, EWOULDBLOCK
2209 * means we were unable to complete the deletion. The
2210 * deletion will update sync_trunc_off in that case.
2212 error = hammer_ip_delete_range(&cursor, ip,
2214 0x7FFFFFFFFFFFFFFFLL, 2);
2215 if (error == EWOULDBLOCK) {
2216 ip->flags |= HAMMER_INODE_WOULDBLOCK;
2218 goto defer_buffer_flush;
2222 Debugger("hammer_ip_delete_range errored");
2225 * Clear the truncation flag on the backend after we have
2226 * complete the deletions. Backend data is now good again
2227 * (including new records we are about to sync, below).
2229 * Leave sync_trunc_off intact. As we write additional
2230 * records the backend will update sync_trunc_off. This
2231 * tells the backend whether it can skip the overwrite
2232 * test. This should work properly even when the backend
2233 * writes full blocks where the truncation point straddles
2234 * the block because the comparison is against the base
2235 * offset of the record.
2237 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2238 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */
2244 * Now sync related records. These will typically be directory
2245 * entries, records tracking direct-writes, or delete-on-disk records.
2248 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2249 hammer_sync_record_callback, &cursor);
2255 hammer_cache_node(&ip->cache[1], cursor.node);
2258 * Re-seek for inode update, assuming our cache hasn't been ripped
2259 * out from under us.
2262 tmp_node = hammer_ref_node_safe(ip->hmp, &ip->cache[0], &error);
2264 hammer_cursor_downgrade(&cursor);
2265 hammer_lock_sh(&tmp_node->lock);
2266 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0)
2267 hammer_cursor_seek(&cursor, tmp_node, 0);
2268 hammer_unlock(&tmp_node->lock);
2269 hammer_rel_node(tmp_node);
2275 * If we are deleting the inode the frontend had better not have
2276 * any active references on elements making up the inode.
2278 * The call to hammer_ip_delete_clean() cleans up auxillary records
2279 * but not DB or DATA records. Those must have already been deleted
2280 * by the normal truncation mechanic.
2282 if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
2283 RB_EMPTY(&ip->rec_tree) &&
2284 (ip->sync_flags & HAMMER_INODE_DELETING) &&
2285 (ip->flags & HAMMER_INODE_DELETED) == 0) {
2288 error = hammer_ip_delete_clean(&cursor, ip, &count1);
2290 ip->flags |= HAMMER_INODE_DELETED;
2291 ip->sync_flags &= ~HAMMER_INODE_DELETING;
2292 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2293 KKASSERT(RB_EMPTY(&ip->rec_tree));
2296 * Set delete_tid in both the frontend and backend
2297 * copy of the inode record. The DELETED flag handles
2298 * this, do not set RDIRTY.
2300 ip->ino_leaf.base.delete_tid = trans.tid;
2301 ip->sync_ino_leaf.base.delete_tid = trans.tid;
2302 ip->ino_leaf.delete_ts = trans.time32;
2303 ip->sync_ino_leaf.delete_ts = trans.time32;
2307 * Adjust the inode count in the volume header
2309 hammer_sync_lock_sh(&trans);
2310 if (ip->flags & HAMMER_INODE_ONDISK) {
2311 hammer_modify_volume_field(&trans,
2314 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
2315 hammer_modify_volume_done(trans.rootvol);
2317 hammer_sync_unlock(&trans);
2319 Debugger("hammer_ip_delete_clean errored");
2323 ip->sync_flags &= ~HAMMER_INODE_BUFS;
2326 Debugger("RB_SCAN errored");
2330 * Now update the inode's on-disk inode-data and/or on-disk record.
2331 * DELETED and ONDISK are managed only in ip->flags.
2333 * In the case of a defered buffer flush we still update the on-disk
2334 * inode to satisfy visibility requirements if there happen to be
2335 * directory dependancies.
2337 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
2338 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
2340 * If deleted and on-disk, don't set any additional flags.
2341 * the delete flag takes care of things.
2343 * Clear flags which may have been set by the frontend.
2345 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
2346 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
2347 HAMMER_INODE_DELETING);
2349 case HAMMER_INODE_DELETED:
2351 * Take care of the case where a deleted inode was never
2352 * flushed to the disk in the first place.
2354 * Clear flags which may have been set by the frontend.
2356 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
2357 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
2358 HAMMER_INODE_DELETING);
2359 while (RB_ROOT(&ip->rec_tree)) {
2360 hammer_record_t record = RB_ROOT(&ip->rec_tree);
2361 hammer_ref(&record->lock);
2362 KKASSERT(record->lock.refs == 1);
2363 record->flags |= HAMMER_RECF_DELETED_FE;
2364 record->flags |= HAMMER_RECF_DELETED_BE;
2365 hammer_rel_mem_record(record);
2368 case HAMMER_INODE_ONDISK:
2370 * If already on-disk, do not set any additional flags.
2375 * If not on-disk and not deleted, set DDIRTY to force
2376 * an initial record to be written.
2378 * Also set the create_tid in both the frontend and backend
2379 * copy of the inode record.
2381 ip->ino_leaf.base.create_tid = trans.tid;
2382 ip->ino_leaf.create_ts = trans.time32;
2383 ip->sync_ino_leaf.base.create_tid = trans.tid;
2384 ip->sync_ino_leaf.create_ts = trans.time32;
2385 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2390 * If RDIRTY or DDIRTY is set, write out a new record. If the inode
2391 * is already on-disk the old record is marked as deleted.
2393 * If DELETED is set hammer_update_inode() will delete the existing
2394 * record without writing out a new one.
2396 * If *ONLY* the ITIMES flag is set we can update the record in-place.
2398 if (ip->flags & HAMMER_INODE_DELETED) {
2399 error = hammer_update_inode(&cursor, ip);
2401 if ((ip->sync_flags & HAMMER_INODE_DDIRTY) == 0 &&
2402 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) {
2403 error = hammer_update_itimes(&cursor, ip);
2405 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
2406 error = hammer_update_inode(&cursor, ip);
2409 Debugger("hammer_update_itimes/inode errored");
2412 * Save the TID we used to sync the inode with to make sure we
2413 * do not improperly reuse it.
2415 hammer_done_cursor(&cursor);
2416 hammer_done_transaction(&trans);
2421 * This routine is called when the OS is no longer actively referencing
2422 * the inode (but might still be keeping it cached), or when releasing
2423 * the last reference to an inode.
2425 * At this point if the inode's nlinks count is zero we want to destroy
2426 * it, which may mean destroying it on-media too.
2429 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
2434 * Set the DELETING flag when the link count drops to 0 and the
2435 * OS no longer has any opens on the inode.
2437 * The backend will clear DELETING (a mod flag) and set DELETED
2438 * (a state flag) when it is actually able to perform the
2441 if (ip->ino_data.nlinks == 0 &&
2442 (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
2443 ip->flags |= HAMMER_INODE_DELETING;
2444 ip->flags |= HAMMER_INODE_TRUNCATED;
2448 if (hammer_get_vnode(ip, &vp) != 0)
2456 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE);
2457 vnode_pager_setsize(ip->vp, 0);
2466 * Re-test an inode when a dependancy had gone away to see if we
2467 * can chain flush it.
2470 hammer_test_inode(hammer_inode_t ip)
2472 if (ip->flags & HAMMER_INODE_REFLUSH) {
2473 ip->flags &= ~HAMMER_INODE_REFLUSH;
2474 hammer_ref(&ip->lock);
2475 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2476 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2477 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2479 hammer_flush_inode(ip, 0);
2481 hammer_rel_inode(ip, 0);
2486 * Clear the RECLAIM flag on an inode. This occurs when the inode is
2487 * reassociated with a vp or just before it gets freed.
2489 * Wakeup one thread blocked waiting on reclaims to complete. Note that
2490 * the inode the thread is waiting on behalf of is a different inode then
2491 * the inode we are called with. This is to create a pipeline.
2494 hammer_inode_wakereclaims(hammer_inode_t ip)
2496 struct hammer_reclaim *reclaim;
2497 hammer_mount_t hmp = ip->hmp;
2499 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0)
2502 --hammer_count_reclaiming;
2503 --hmp->inode_reclaims;
2504 ip->flags &= ~HAMMER_INODE_RECLAIM;
2506 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) {
2507 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry);
2508 reclaim->okydoky = 1;
2514 * Setup our reclaim pipeline. We only let so many detached (and dirty)
2515 * inodes build up before we start blocking.
2517 * When we block we don't care *which* inode has finished reclaiming,
2518 * as lone as one does. This is somewhat heuristical... we also put a
2519 * cap on how long we are willing to wait.
2522 hammer_inode_waitreclaims(hammer_mount_t hmp)
2524 struct hammer_reclaim reclaim;
2527 if (hmp->inode_reclaims > HAMMER_RECLAIM_WAIT) {
2528 reclaim.okydoky = 0;
2529 TAILQ_INSERT_TAIL(&hmp->reclaim_list,
2532 reclaim.okydoky = 1;
2535 if (reclaim.okydoky == 0) {
2536 delay = (hmp->inode_reclaims - HAMMER_RECLAIM_WAIT) * hz /
2537 HAMMER_RECLAIM_WAIT;
2539 tsleep(&reclaim, 0, "hmrrcm", delay + 1);
2540 if (reclaim.okydoky == 0)
2541 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry);