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 1.114 2008/09/24 00:53:51 dillon Exp $
38 #include <vm/vm_extern.h>
40 static int hammer_unload_inode(struct hammer_inode *ip);
41 static void hammer_free_inode(hammer_inode_t ip);
42 static void hammer_flush_inode_core(hammer_inode_t ip,
43 hammer_flush_group_t flg, int flags);
44 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);
48 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
49 hammer_flush_group_t flg);
50 static int hammer_setup_parent_inodes_helper(hammer_record_t record,
51 int depth, hammer_flush_group_t flg);
52 static void hammer_inode_wakereclaims(hammer_inode_t ip);
53 static struct hammer_inostats *hammer_inode_inostats(hammer_mount_t hmp,
57 extern struct hammer_inode *HammerTruncIp;
61 * RB-Tree support for inode structures
64 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2)
66 if (ip1->obj_localization < ip2->obj_localization)
68 if (ip1->obj_localization > ip2->obj_localization)
70 if (ip1->obj_id < ip2->obj_id)
72 if (ip1->obj_id > ip2->obj_id)
74 if (ip1->obj_asof < ip2->obj_asof)
76 if (ip1->obj_asof > ip2->obj_asof)
82 hammer_redo_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2)
84 if (ip1->redo_fifo_start < ip2->redo_fifo_start)
86 if (ip1->redo_fifo_start > ip2->redo_fifo_start)
92 * RB-Tree support for inode structures / special LOOKUP_INFO
95 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip)
97 if (info->obj_localization < ip->obj_localization)
99 if (info->obj_localization > ip->obj_localization)
101 if (info->obj_id < ip->obj_id)
103 if (info->obj_id > ip->obj_id)
105 if (info->obj_asof < ip->obj_asof)
107 if (info->obj_asof > ip->obj_asof)
113 * Used by hammer_scan_inode_snapshots() to locate all of an object's
114 * snapshots. Note that the asof field is not tested, which we can get
115 * away with because it is the lowest-priority field.
118 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data)
120 hammer_inode_info_t info = data;
122 if (ip->obj_localization > info->obj_localization)
124 if (ip->obj_localization < info->obj_localization)
126 if (ip->obj_id > info->obj_id)
128 if (ip->obj_id < info->obj_id)
134 * Used by hammer_unload_pseudofs() to locate all inodes associated with
138 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data)
140 u_int32_t localization = *(u_int32_t *)data;
141 if (ip->obj_localization > localization)
143 if (ip->obj_localization < localization)
149 * RB-Tree support for pseudofs structures
152 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2)
154 if (p1->localization < p2->localization)
156 if (p1->localization > p2->localization)
162 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare);
163 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node,
164 hammer_inode_info_cmp, hammer_inode_info_t);
165 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node,
166 hammer_pfs_rb_compare, u_int32_t, localization);
169 * The kernel is not actively referencing this vnode but is still holding
172 * This is called from the frontend.
177 hammer_vop_inactive(struct vop_inactive_args *ap)
179 struct hammer_inode *ip = VTOI(ap->a_vp);
191 * If the inode no longer has visibility in the filesystem try to
192 * recycle it immediately, even if the inode is dirty. Recycling
193 * it quickly allows the system to reclaim buffer cache and VM
194 * resources which can matter a lot in a heavily loaded system.
196 * This can deadlock in vfsync() if we aren't careful.
198 * Do not queue the inode to the flusher if we still have visibility,
199 * otherwise namespace calls such as chmod will unnecessarily generate
200 * multiple inode updates.
202 if (ip->ino_data.nlinks == 0) {
204 lwkt_gettoken(&hmp->fs_token);
205 hammer_inode_unloadable_check(ip, 0);
206 if (ip->flags & HAMMER_INODE_MODMASK)
207 hammer_flush_inode(ip, 0);
208 lwkt_reltoken(&hmp->fs_token);
215 * Release the vnode association. This is typically (but not always)
216 * the last reference on the inode.
218 * Once the association is lost we are on our own with regards to
219 * flushing the inode.
221 * We must interlock ip->vp so hammer_get_vnode() can avoid races.
224 hammer_vop_reclaim(struct vop_reclaim_args *ap)
226 struct hammer_inode *ip;
232 if ((ip = vp->v_data) != NULL) {
234 lwkt_gettoken(&hmp->fs_token);
235 hammer_lock_ex(&ip->lock);
239 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) {
240 ++hammer_count_reclaiming;
241 ++hmp->inode_reclaims;
242 ip->flags |= HAMMER_INODE_RECLAIM;
244 hammer_unlock(&ip->lock);
245 hammer_rel_inode(ip, 1);
246 lwkt_reltoken(&hmp->fs_token);
252 * Return a locked vnode for the specified inode. The inode must be
253 * referenced but NOT LOCKED on entry and will remain referenced on
256 * Called from the frontend.
259 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp)
269 if ((vp = ip->vp) == NULL) {
270 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0);
273 hammer_lock_ex(&ip->lock);
274 if (ip->vp != NULL) {
275 hammer_unlock(&ip->lock);
281 hammer_ref(&ip->lock);
285 obj_type = ip->ino_data.obj_type;
286 vp->v_type = hammer_get_vnode_type(obj_type);
288 hammer_inode_wakereclaims(ip);
290 switch(ip->ino_data.obj_type) {
291 case HAMMER_OBJTYPE_CDEV:
292 case HAMMER_OBJTYPE_BDEV:
293 vp->v_ops = &hmp->mp->mnt_vn_spec_ops;
294 addaliasu(vp, ip->ino_data.rmajor,
295 ip->ino_data.rminor);
297 case HAMMER_OBJTYPE_FIFO:
298 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops;
300 case HAMMER_OBJTYPE_REGFILE:
307 * Only mark as the root vnode if the ip is not
308 * historical, otherwise the VFS cache will get
309 * confused. The other half of the special handling
310 * is in hammer_vop_nlookupdotdot().
312 * Pseudo-filesystem roots can be accessed via
313 * non-root filesystem paths and setting VROOT may
314 * confuse the namecache. Set VPFSROOT instead.
316 if (ip->obj_id == HAMMER_OBJID_ROOT &&
317 ip->obj_asof == hmp->asof) {
318 if (ip->obj_localization == 0)
319 vsetflags(vp, VROOT);
321 vsetflags(vp, VPFSROOT);
324 vp->v_data = (void *)ip;
325 /* vnode locked by getnewvnode() */
326 /* make related vnode dirty if inode dirty? */
327 hammer_unlock(&ip->lock);
328 if (vp->v_type == VREG) {
329 vinitvmio(vp, ip->ino_data.size,
330 hammer_blocksize(ip->ino_data.size),
331 hammer_blockoff(ip->ino_data.size));
337 * Interlock vnode clearing. This does not prevent the
338 * vnode from going into a reclaimed state but it does
339 * prevent it from being destroyed or reused so the vget()
340 * will properly fail.
342 hammer_lock_ex(&ip->lock);
343 if ((vp = ip->vp) == NULL) {
344 hammer_unlock(&ip->lock);
347 vhold_interlocked(vp);
348 hammer_unlock(&ip->lock);
351 * loop if the vget fails (aka races), or if the vp
352 * no longer matches ip->vp.
354 if (vget(vp, LK_EXCLUSIVE) == 0) {
368 * Locate all copies of the inode for obj_id compatible with the specified
369 * asof, reference, and issue the related call-back. This routine is used
370 * for direct-io invalidation and does not create any new inodes.
373 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo,
374 int (*callback)(hammer_inode_t ip, void *data),
377 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root,
378 hammer_inode_info_cmp_all_history,
383 * Acquire a HAMMER inode. The returned inode is not locked. These functions
384 * do not attach or detach the related vnode (use hammer_get_vnode() for
387 * The flags argument is only applied for newly created inodes, and only
388 * certain flags are inherited.
390 * Called from the frontend.
392 struct hammer_inode *
393 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip,
394 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
395 int flags, int *errorp)
397 hammer_mount_t hmp = trans->hmp;
398 struct hammer_node_cache *cachep;
399 struct hammer_inode_info iinfo;
400 struct hammer_cursor cursor;
401 struct hammer_inode *ip;
405 * Determine if we already have an inode cached. If we do then
408 * If we find an inode with no vnode we have to mark the
409 * transaction such that hammer_inode_waitreclaims() is
410 * called later on to avoid building up an infinite number
411 * of inodes. Otherwise we can continue to * add new inodes
412 * faster then they can be disposed of, even with the tsleep
415 * If we find a dummy inode we return a failure so dounlink
416 * (which does another lookup) doesn't try to mess with the
417 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode()
418 * to ref dummy inodes.
420 iinfo.obj_id = obj_id;
421 iinfo.obj_asof = asof;
422 iinfo.obj_localization = localization;
424 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
426 if (ip->flags & HAMMER_INODE_DUMMY) {
430 hammer_ref(&ip->lock);
436 * Allocate a new inode structure and deal with races later.
438 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
439 ++hammer_count_inodes;
442 ip->obj_asof = iinfo.obj_asof;
443 ip->obj_localization = localization;
445 ip->flags = flags & HAMMER_INODE_RO;
446 ip->cache[0].ip = ip;
447 ip->cache[1].ip = ip;
448 ip->cache[2].ip = ip;
449 ip->cache[3].ip = ip;
451 ip->flags |= HAMMER_INODE_RO;
452 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
453 0x7FFFFFFFFFFFFFFFLL;
454 RB_INIT(&ip->rec_tree);
455 TAILQ_INIT(&ip->target_list);
456 hammer_ref(&ip->lock);
459 * Locate the on-disk inode. If this is a PFS root we always
460 * access the current version of the root inode and (if it is not
461 * a master) always access information under it with a snapshot
464 * We cache recent inode lookups in this directory in dip->cache[2].
465 * If we can't find it we assume the inode we are looking for is
466 * close to the directory inode.
471 if (dip->cache[2].node)
472 cachep = &dip->cache[2];
474 cachep = &dip->cache[0];
476 hammer_init_cursor(trans, &cursor, cachep, NULL);
477 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE;
478 cursor.key_beg.obj_id = ip->obj_id;
479 cursor.key_beg.key = 0;
480 cursor.key_beg.create_tid = 0;
481 cursor.key_beg.delete_tid = 0;
482 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
483 cursor.key_beg.obj_type = 0;
485 cursor.asof = iinfo.obj_asof;
486 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA |
489 *errorp = hammer_btree_lookup(&cursor);
490 if (*errorp == EDEADLK) {
491 hammer_done_cursor(&cursor);
496 * On success the B-Tree lookup will hold the appropriate
497 * buffer cache buffers and provide a pointer to the requested
498 * information. Copy the information to the in-memory inode
499 * and cache the B-Tree node to improve future operations.
502 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
503 ip->ino_data = cursor.data->inode;
506 * cache[0] tries to cache the location of the object inode.
507 * The assumption is that it is near the directory inode.
509 * cache[1] tries to cache the location of the object data.
510 * We might have something in the governing directory from
511 * scan optimizations (see the strategy code in
514 * We update dip->cache[2], if possible, with the location
515 * of the object inode for future directory shortcuts.
517 hammer_cache_node(&ip->cache[0], cursor.node);
519 if (dip->cache[3].node) {
520 hammer_cache_node(&ip->cache[1],
523 hammer_cache_node(&dip->cache[2], cursor.node);
527 * The file should not contain any data past the file size
528 * stored in the inode. Setting save_trunc_off to the
529 * file size instead of max reduces B-Tree lookup overheads
530 * on append by allowing the flusher to avoid checking for
533 ip->save_trunc_off = ip->ino_data.size;
536 * Locate and assign the pseudofs management structure to
539 if (dip && dip->obj_localization == ip->obj_localization) {
540 ip->pfsm = dip->pfsm;
541 hammer_ref(&ip->pfsm->lock);
543 ip->pfsm = hammer_load_pseudofs(trans,
544 ip->obj_localization,
546 *errorp = 0; /* ignore ENOENT */
551 * The inode is placed on the red-black tree and will be synced to
552 * the media when flushed or by the filesystem sync. If this races
553 * another instantiation/lookup the insertion will fail.
556 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
557 hammer_free_inode(ip);
558 hammer_done_cursor(&cursor);
561 ip->flags |= HAMMER_INODE_ONDISK;
563 if (ip->flags & HAMMER_INODE_RSV_INODES) {
564 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
568 hammer_free_inode(ip);
571 hammer_done_cursor(&cursor);
574 * NEWINODE is only set if the inode becomes dirty later,
575 * setting it here just leads to unnecessary stalls.
577 * trans->flags |= HAMMER_TRANSF_NEWINODE;
583 * Get a dummy inode to placemark a broken directory entry.
585 struct hammer_inode *
586 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip,
587 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
588 int flags, int *errorp)
590 hammer_mount_t hmp = trans->hmp;
591 struct hammer_inode_info iinfo;
592 struct hammer_inode *ip;
595 * Determine if we already have an inode cached. If we do then
598 * If we find an inode with no vnode we have to mark the
599 * transaction such that hammer_inode_waitreclaims() is
600 * called later on to avoid building up an infinite number
601 * of inodes. Otherwise we can continue to * add new inodes
602 * faster then they can be disposed of, even with the tsleep
605 * If we find a non-fake inode we return an error. Only fake
606 * inodes can be returned by this routine.
608 iinfo.obj_id = obj_id;
609 iinfo.obj_asof = asof;
610 iinfo.obj_localization = localization;
613 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
615 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) {
619 hammer_ref(&ip->lock);
624 * Allocate a new inode structure and deal with races later.
626 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
627 ++hammer_count_inodes;
630 ip->obj_asof = iinfo.obj_asof;
631 ip->obj_localization = localization;
633 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY;
634 ip->cache[0].ip = ip;
635 ip->cache[1].ip = ip;
636 ip->cache[2].ip = ip;
637 ip->cache[3].ip = ip;
638 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
639 0x7FFFFFFFFFFFFFFFLL;
640 RB_INIT(&ip->rec_tree);
641 TAILQ_INIT(&ip->target_list);
642 hammer_ref(&ip->lock);
645 * Populate the dummy inode. Leave everything zero'd out.
647 * (ip->ino_leaf and ip->ino_data)
649 * Make the dummy inode a FIFO object which most copy programs
650 * will properly ignore.
652 ip->save_trunc_off = ip->ino_data.size;
653 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO;
656 * Locate and assign the pseudofs management structure to
659 if (dip && dip->obj_localization == ip->obj_localization) {
660 ip->pfsm = dip->pfsm;
661 hammer_ref(&ip->pfsm->lock);
663 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization,
665 *errorp = 0; /* ignore ENOENT */
669 * The inode is placed on the red-black tree and will be synced to
670 * the media when flushed or by the filesystem sync. If this races
671 * another instantiation/lookup the insertion will fail.
673 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake.
676 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
677 hammer_free_inode(ip);
681 if (ip->flags & HAMMER_INODE_RSV_INODES) {
682 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
685 hammer_free_inode(ip);
688 trans->flags |= HAMMER_TRANSF_NEWINODE;
693 * Return a referenced inode only if it is in our inode cache.
695 * Dummy inodes do not count.
697 struct hammer_inode *
698 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id,
699 hammer_tid_t asof, u_int32_t localization)
701 hammer_mount_t hmp = trans->hmp;
702 struct hammer_inode_info iinfo;
703 struct hammer_inode *ip;
705 iinfo.obj_id = obj_id;
706 iinfo.obj_asof = asof;
707 iinfo.obj_localization = localization;
709 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
711 if (ip->flags & HAMMER_INODE_DUMMY)
714 hammer_ref(&ip->lock);
720 * Create a new filesystem object, returning the inode in *ipp. The
721 * returned inode will be referenced. The inode is created in-memory.
723 * If pfsm is non-NULL the caller wishes to create the root inode for
727 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
729 hammer_inode_t dip, const char *name, int namelen,
730 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp)
741 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
742 ++hammer_count_inodes;
744 trans->flags |= HAMMER_TRANSF_NEWINODE;
747 KKASSERT(pfsm->localization != 0);
748 ip->obj_id = HAMMER_OBJID_ROOT;
749 ip->obj_localization = pfsm->localization;
751 KKASSERT(dip != NULL);
752 namekey = hammer_directory_namekey(dip, name, namelen, &dummy);
753 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey);
754 ip->obj_localization = dip->obj_localization;
757 KKASSERT(ip->obj_id != 0);
758 ip->obj_asof = hmp->asof;
760 ip->flush_state = HAMMER_FST_IDLE;
761 ip->flags = HAMMER_INODE_DDIRTY |
762 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME;
763 ip->cache[0].ip = ip;
764 ip->cache[1].ip = ip;
765 ip->cache[2].ip = ip;
766 ip->cache[3].ip = ip;
768 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
769 /* ip->save_trunc_off = 0; (already zero) */
770 RB_INIT(&ip->rec_tree);
771 TAILQ_INIT(&ip->target_list);
773 ip->ino_data.atime = trans->time;
774 ip->ino_data.mtime = trans->time;
775 ip->ino_data.size = 0;
776 ip->ino_data.nlinks = 0;
779 * A nohistory designator on the parent directory is inherited by
780 * the child. We will do this even for pseudo-fs creation... the
781 * sysad can turn it off.
784 ip->ino_data.uflags = dip->ino_data.uflags &
785 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
788 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
789 ip->ino_leaf.base.localization = ip->obj_localization +
790 HAMMER_LOCALIZE_INODE;
791 ip->ino_leaf.base.obj_id = ip->obj_id;
792 ip->ino_leaf.base.key = 0;
793 ip->ino_leaf.base.create_tid = 0;
794 ip->ino_leaf.base.delete_tid = 0;
795 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
796 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
798 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
799 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
800 ip->ino_data.mode = vap->va_mode;
801 ip->ino_data.ctime = trans->time;
804 * If we are running version 2 or greater directory entries are
805 * inode-localized instead of data-localized.
807 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) {
808 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
809 ip->ino_data.cap_flags |=
810 HAMMER_INODE_CAP_DIR_LOCAL_INO;
813 if (trans->hmp->version >= HAMMER_VOL_VERSION_SIX) {
814 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
815 ip->ino_data.cap_flags |=
816 HAMMER_INODE_CAP_DIRHASH_ALG1;
821 * Setup the ".." pointer. This only needs to be done for directories
822 * but we do it for all objects as a recovery aid.
825 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id;
828 * The parent_obj_localization field only applies to pseudo-fs roots.
829 * XXX this is no longer applicable, PFSs are no longer directly
830 * tied into the parent's directory structure.
832 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY &&
833 ip->obj_id == HAMMER_OBJID_ROOT) {
834 ip->ino_data.ext.obj.parent_obj_localization =
835 dip->obj_localization;
839 switch(ip->ino_leaf.base.obj_type) {
840 case HAMMER_OBJTYPE_CDEV:
841 case HAMMER_OBJTYPE_BDEV:
842 ip->ino_data.rmajor = vap->va_rmajor;
843 ip->ino_data.rminor = vap->va_rminor;
850 * Calculate default uid/gid and overwrite with information from
854 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
855 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode,
856 xuid, cred, &vap->va_mode);
860 ip->ino_data.mode = vap->va_mode;
862 if (vap->va_vaflags & VA_UID_UUID_VALID)
863 ip->ino_data.uid = vap->va_uid_uuid;
864 else if (vap->va_uid != (uid_t)VNOVAL)
865 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
867 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
869 if (vap->va_vaflags & VA_GID_UUID_VALID)
870 ip->ino_data.gid = vap->va_gid_uuid;
871 else if (vap->va_gid != (gid_t)VNOVAL)
872 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
874 ip->ino_data.gid = dip->ino_data.gid;
876 hammer_ref(&ip->lock);
880 hammer_ref(&pfsm->lock);
882 } else if (dip->obj_localization == ip->obj_localization) {
883 ip->pfsm = dip->pfsm;
884 hammer_ref(&ip->pfsm->lock);
887 ip->pfsm = hammer_load_pseudofs(trans,
888 ip->obj_localization,
890 error = 0; /* ignore ENOENT */
894 hammer_free_inode(ip);
896 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
897 panic("hammer_create_inode: duplicate obj_id %llx",
898 (long long)ip->obj_id);
900 hammer_free_inode(ip);
907 * Final cleanup / freeing of an inode structure
910 hammer_free_inode(hammer_inode_t ip)
912 struct hammer_mount *hmp;
915 KKASSERT(hammer_oneref(&ip->lock));
916 hammer_uncache_node(&ip->cache[0]);
917 hammer_uncache_node(&ip->cache[1]);
918 hammer_uncache_node(&ip->cache[2]);
919 hammer_uncache_node(&ip->cache[3]);
920 hammer_inode_wakereclaims(ip);
922 hammer_clear_objid(ip);
923 --hammer_count_inodes;
926 hammer_rel_pseudofs(hmp, ip->pfsm);
929 kfree(ip, hmp->m_inodes);
934 * Retrieve pseudo-fs data. NULL will never be returned.
936 * If an error occurs *errorp will be set and a default template is returned,
937 * otherwise *errorp is set to 0. Typically when an error occurs it will
940 hammer_pseudofs_inmem_t
941 hammer_load_pseudofs(hammer_transaction_t trans,
942 u_int32_t localization, int *errorp)
944 hammer_mount_t hmp = trans->hmp;
946 hammer_pseudofs_inmem_t pfsm;
947 struct hammer_cursor cursor;
951 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization);
953 hammer_ref(&pfsm->lock);
959 * PFS records are stored in the root inode (not the PFS root inode,
960 * but the real root). Avoid an infinite recursion if loading
961 * the PFS for the real root.
964 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT,
966 HAMMER_DEF_LOCALIZATION, 0, errorp);
971 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO);
972 pfsm->localization = localization;
973 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid;
974 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid;
976 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip);
977 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION +
978 HAMMER_LOCALIZE_MISC;
979 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
980 cursor.key_beg.create_tid = 0;
981 cursor.key_beg.delete_tid = 0;
982 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
983 cursor.key_beg.obj_type = 0;
984 cursor.key_beg.key = localization;
985 cursor.asof = HAMMER_MAX_TID;
986 cursor.flags |= HAMMER_CURSOR_ASOF;
989 *errorp = hammer_ip_lookup(&cursor);
991 *errorp = hammer_btree_lookup(&cursor);
993 *errorp = hammer_ip_resolve_data(&cursor);
995 if (cursor.data->pfsd.mirror_flags &
996 HAMMER_PFSD_DELETED) {
999 bytes = cursor.leaf->data_len;
1000 if (bytes > sizeof(pfsm->pfsd))
1001 bytes = sizeof(pfsm->pfsd);
1002 bcopy(cursor.data, &pfsm->pfsd, bytes);
1006 hammer_done_cursor(&cursor);
1008 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1009 hammer_ref(&pfsm->lock);
1011 hammer_rel_inode(ip, 0);
1012 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) {
1013 kfree(pfsm, hmp->m_misc);
1020 * Store pseudo-fs data. The backend will automatically delete any prior
1021 * on-disk pseudo-fs data but we have to delete in-memory versions.
1024 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm)
1026 struct hammer_cursor cursor;
1027 hammer_record_t record;
1031 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1032 HAMMER_DEF_LOCALIZATION, 0, &error);
1034 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1035 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
1036 cursor.key_beg.localization = ip->obj_localization +
1037 HAMMER_LOCALIZE_MISC;
1038 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
1039 cursor.key_beg.create_tid = 0;
1040 cursor.key_beg.delete_tid = 0;
1041 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
1042 cursor.key_beg.obj_type = 0;
1043 cursor.key_beg.key = pfsm->localization;
1044 cursor.asof = HAMMER_MAX_TID;
1045 cursor.flags |= HAMMER_CURSOR_ASOF;
1048 * Replace any in-memory version of the record.
1050 error = hammer_ip_lookup(&cursor);
1051 if (error == 0 && hammer_cursor_inmem(&cursor)) {
1052 record = cursor.iprec;
1053 if (record->flags & HAMMER_RECF_INTERLOCK_BE) {
1054 KKASSERT(cursor.deadlk_rec == NULL);
1055 hammer_ref(&record->lock);
1056 cursor.deadlk_rec = record;
1059 record->flags |= HAMMER_RECF_DELETED_FE;
1065 * Allocate replacement general record. The backend flush will
1066 * delete any on-disk version of the record.
1068 if (error == 0 || error == ENOENT) {
1069 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd));
1070 record->type = HAMMER_MEM_RECORD_GENERAL;
1072 record->leaf.base.localization = ip->obj_localization +
1073 HAMMER_LOCALIZE_MISC;
1074 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS;
1075 record->leaf.base.key = pfsm->localization;
1076 record->leaf.data_len = sizeof(pfsm->pfsd);
1077 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd));
1078 error = hammer_ip_add_record(trans, record);
1080 hammer_done_cursor(&cursor);
1081 if (error == EDEADLK)
1083 hammer_rel_inode(ip, 0);
1088 * Create a root directory for a PFS if one does not alredy exist.
1090 * The PFS root stands alone so we must also bump the nlinks count
1091 * to prevent it from being destroyed on release.
1094 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred,
1095 hammer_pseudofs_inmem_t pfsm)
1101 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1102 pfsm->localization, 0, &error);
1107 error = hammer_create_inode(trans, &vap, cred,
1111 ++ip->ino_data.nlinks;
1112 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY);
1116 hammer_rel_inode(ip, 0);
1121 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY
1122 * if we are unable to disassociate all the inodes.
1126 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data)
1130 hammer_ref(&ip->lock);
1131 if (hammer_isactive(&ip->lock) == 2 && ip->vp)
1132 vclean_unlocked(ip->vp);
1133 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL)
1136 res = -1; /* stop, someone is using the inode */
1137 hammer_rel_inode(ip, 0);
1142 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization)
1147 for (try = res = 0; try < 4; ++try) {
1148 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root,
1149 hammer_inode_pfs_cmp,
1150 hammer_unload_pseudofs_callback,
1152 if (res == 0 && try > 1)
1154 hammer_flusher_sync(trans->hmp);
1163 * Release a reference on a PFS
1166 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm)
1168 hammer_rel(&pfsm->lock);
1169 if (hammer_norefs(&pfsm->lock)) {
1170 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm);
1171 kfree(pfsm, hmp->m_misc);
1176 * Called by hammer_sync_inode().
1179 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
1181 hammer_transaction_t trans = cursor->trans;
1182 hammer_record_t record;
1190 * If the inode has a presence on-disk then locate it and mark
1191 * it deleted, setting DELONDISK.
1193 * The record may or may not be physically deleted, depending on
1194 * the retention policy.
1196 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
1197 HAMMER_INODE_ONDISK) {
1198 hammer_normalize_cursor(cursor);
1199 cursor->key_beg.localization = ip->obj_localization +
1200 HAMMER_LOCALIZE_INODE;
1201 cursor->key_beg.obj_id = ip->obj_id;
1202 cursor->key_beg.key = 0;
1203 cursor->key_beg.create_tid = 0;
1204 cursor->key_beg.delete_tid = 0;
1205 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1206 cursor->key_beg.obj_type = 0;
1207 cursor->asof = ip->obj_asof;
1208 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1209 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
1210 cursor->flags |= HAMMER_CURSOR_BACKEND;
1212 error = hammer_btree_lookup(cursor);
1213 if (hammer_debug_inode)
1214 kprintf("IPDEL %p %08x %d", ip, ip->flags, error);
1217 error = hammer_ip_delete_record(cursor, ip, trans->tid);
1218 if (hammer_debug_inode)
1219 kprintf(" error %d\n", error);
1221 ip->flags |= HAMMER_INODE_DELONDISK;
1224 hammer_cache_node(&ip->cache[0], cursor->node);
1226 if (error == EDEADLK) {
1227 hammer_done_cursor(cursor);
1228 error = hammer_init_cursor(trans, cursor,
1230 if (hammer_debug_inode)
1231 kprintf("IPDED %p %d\n", ip, error);
1238 * Ok, write out the initial record or a new record (after deleting
1239 * the old one), unless the DELETED flag is set. This routine will
1240 * clear DELONDISK if it writes out a record.
1242 * Update our inode statistics if this is the first application of
1243 * the inode on-disk.
1245 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
1247 * Generate a record and write it to the media. We clean-up
1248 * the state before releasing so we do not have to set-up
1251 record = hammer_alloc_mem_record(ip, 0);
1252 record->type = HAMMER_MEM_RECORD_INODE;
1253 record->flush_state = HAMMER_FST_FLUSH;
1254 record->leaf = ip->sync_ino_leaf;
1255 record->leaf.base.create_tid = trans->tid;
1256 record->leaf.data_len = sizeof(ip->sync_ino_data);
1257 record->leaf.create_ts = trans->time32;
1258 record->data = (void *)&ip->sync_ino_data;
1259 record->flags |= HAMMER_RECF_INTERLOCK_BE;
1262 * If this flag is set we cannot sync the new file size
1263 * because we haven't finished related truncations. The
1264 * inode will be flushed in another flush group to finish
1267 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) &&
1268 ip->sync_ino_data.size != ip->ino_data.size) {
1270 ip->sync_ino_data.size = ip->ino_data.size;
1276 error = hammer_ip_sync_record_cursor(cursor, record);
1277 if (hammer_debug_inode)
1278 kprintf("GENREC %p rec %08x %d\n",
1279 ip, record->flags, error);
1280 if (error != EDEADLK)
1282 hammer_done_cursor(cursor);
1283 error = hammer_init_cursor(trans, cursor,
1285 if (hammer_debug_inode)
1286 kprintf("GENREC reinit %d\n", error);
1292 * Note: The record was never on the inode's record tree
1293 * so just wave our hands importantly and destroy it.
1295 record->flags |= HAMMER_RECF_COMMITTED;
1296 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
1297 record->flush_state = HAMMER_FST_IDLE;
1298 ++ip->rec_generation;
1299 hammer_rel_mem_record(record);
1305 if (hammer_debug_inode)
1306 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
1307 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1308 HAMMER_INODE_SDIRTY |
1309 HAMMER_INODE_ATIME |
1310 HAMMER_INODE_MTIME);
1311 ip->flags &= ~HAMMER_INODE_DELONDISK;
1313 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1316 * Root volume count of inodes
1318 hammer_sync_lock_sh(trans);
1319 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
1320 hammer_modify_volume_field(trans,
1323 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
1324 hammer_modify_volume_done(trans->rootvol);
1325 ip->flags |= HAMMER_INODE_ONDISK;
1326 if (hammer_debug_inode)
1327 kprintf("NOWONDISK %p\n", ip);
1329 hammer_sync_unlock(trans);
1334 * If the inode has been destroyed, clean out any left-over flags
1335 * that may have been set by the frontend.
1337 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
1338 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1339 HAMMER_INODE_SDIRTY |
1340 HAMMER_INODE_ATIME |
1341 HAMMER_INODE_MTIME);
1347 * Update only the itimes fields.
1349 * ATIME can be updated without generating any UNDO. MTIME is updated
1350 * with UNDO so it is guaranteed to be synchronized properly in case of
1353 * Neither field is included in the B-Tree leaf element's CRC, which is how
1354 * we can get away with updating ATIME the way we do.
1357 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
1359 hammer_transaction_t trans = cursor->trans;
1363 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) !=
1364 HAMMER_INODE_ONDISK) {
1368 hammer_normalize_cursor(cursor);
1369 cursor->key_beg.localization = ip->obj_localization +
1370 HAMMER_LOCALIZE_INODE;
1371 cursor->key_beg.obj_id = ip->obj_id;
1372 cursor->key_beg.key = 0;
1373 cursor->key_beg.create_tid = 0;
1374 cursor->key_beg.delete_tid = 0;
1375 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1376 cursor->key_beg.obj_type = 0;
1377 cursor->asof = ip->obj_asof;
1378 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1379 cursor->flags |= HAMMER_CURSOR_ASOF;
1380 cursor->flags |= HAMMER_CURSOR_GET_LEAF;
1381 cursor->flags |= HAMMER_CURSOR_GET_DATA;
1382 cursor->flags |= HAMMER_CURSOR_BACKEND;
1384 error = hammer_btree_lookup(cursor);
1386 hammer_cache_node(&ip->cache[0], cursor->node);
1387 if (ip->sync_flags & HAMMER_INODE_MTIME) {
1389 * Updating MTIME requires an UNDO. Just cover
1390 * both atime and mtime.
1392 hammer_sync_lock_sh(trans);
1393 hammer_modify_buffer(trans, cursor->data_buffer,
1394 HAMMER_ITIMES_BASE(&cursor->data->inode),
1395 HAMMER_ITIMES_BYTES);
1396 cursor->data->inode.atime = ip->sync_ino_data.atime;
1397 cursor->data->inode.mtime = ip->sync_ino_data.mtime;
1398 hammer_modify_buffer_done(cursor->data_buffer);
1399 hammer_sync_unlock(trans);
1400 } else if (ip->sync_flags & HAMMER_INODE_ATIME) {
1402 * Updating atime only can be done in-place with
1405 hammer_sync_lock_sh(trans);
1406 hammer_modify_buffer(trans, cursor->data_buffer,
1408 cursor->data->inode.atime = ip->sync_ino_data.atime;
1409 hammer_modify_buffer_done(cursor->data_buffer);
1410 hammer_sync_unlock(trans);
1412 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME);
1414 if (error == EDEADLK) {
1415 hammer_done_cursor(cursor);
1416 error = hammer_init_cursor(trans, cursor,
1425 * Release a reference on an inode, flush as requested.
1427 * On the last reference we queue the inode to the flusher for its final
1431 hammer_rel_inode(struct hammer_inode *ip, int flush)
1433 /*hammer_mount_t hmp = ip->hmp;*/
1436 * Handle disposition when dropping the last ref.
1439 if (hammer_oneref(&ip->lock)) {
1441 * Determine whether on-disk action is needed for
1442 * the inode's final disposition.
1444 KKASSERT(ip->vp == NULL);
1445 hammer_inode_unloadable_check(ip, 0);
1446 if (ip->flags & HAMMER_INODE_MODMASK) {
1447 hammer_flush_inode(ip, 0);
1448 } else if (hammer_oneref(&ip->lock)) {
1449 hammer_unload_inode(ip);
1454 hammer_flush_inode(ip, 0);
1457 * The inode still has multiple refs, try to drop
1460 KKASSERT(hammer_isactive(&ip->lock) >= 1);
1461 if (hammer_isactive(&ip->lock) > 1) {
1462 hammer_rel(&ip->lock);
1470 * Unload and destroy the specified inode. Must be called with one remaining
1471 * reference. The reference is disposed of.
1473 * The inode must be completely clean.
1476 hammer_unload_inode(struct hammer_inode *ip)
1478 hammer_mount_t hmp = ip->hmp;
1480 KASSERT(hammer_oneref(&ip->lock),
1481 ("hammer_unload_inode: %d refs\n", hammer_isactive(&ip->lock)));
1482 KKASSERT(ip->vp == NULL);
1483 KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
1484 KKASSERT(ip->cursor_ip_refs == 0);
1485 KKASSERT(hammer_notlocked(&ip->lock));
1486 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
1488 KKASSERT(RB_EMPTY(&ip->rec_tree));
1489 KKASSERT(TAILQ_EMPTY(&ip->target_list));
1491 if (ip->flags & HAMMER_INODE_RDIRTY) {
1492 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip);
1493 ip->flags &= ~HAMMER_INODE_RDIRTY;
1495 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
1497 hammer_free_inode(ip);
1502 * Called during unmounting if a critical error occured. The in-memory
1503 * inode and all related structures are destroyed.
1505 * If a critical error did not occur the unmount code calls the standard
1506 * release and asserts that the inode is gone.
1509 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused)
1511 hammer_record_t rec;
1514 * Get rid of the inodes in-memory records, regardless of their
1515 * state, and clear the mod-mask.
1517 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) {
1518 TAILQ_REMOVE(&ip->target_list, rec, target_entry);
1519 rec->target_ip = NULL;
1520 if (rec->flush_state == HAMMER_FST_SETUP)
1521 rec->flush_state = HAMMER_FST_IDLE;
1523 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) {
1524 if (rec->flush_state == HAMMER_FST_FLUSH)
1525 --rec->flush_group->refs;
1527 hammer_ref(&rec->lock);
1528 KKASSERT(hammer_oneref(&rec->lock));
1529 rec->flush_state = HAMMER_FST_IDLE;
1530 rec->flush_group = NULL;
1531 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */
1532 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */
1533 ++ip->rec_generation;
1534 hammer_rel_mem_record(rec);
1536 ip->flags &= ~HAMMER_INODE_MODMASK;
1537 ip->sync_flags &= ~HAMMER_INODE_MODMASK;
1538 KKASSERT(ip->vp == NULL);
1541 * Remove the inode from any flush group, force it idle. FLUSH
1542 * and SETUP states have an inode ref.
1544 switch(ip->flush_state) {
1545 case HAMMER_FST_FLUSH:
1546 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
1547 --ip->flush_group->refs;
1548 ip->flush_group = NULL;
1550 case HAMMER_FST_SETUP:
1551 hammer_rel(&ip->lock);
1552 ip->flush_state = HAMMER_FST_IDLE;
1554 case HAMMER_FST_IDLE:
1559 * There shouldn't be any associated vnode. The unload needs at
1560 * least one ref, if we do have a vp steal its ip ref.
1563 kprintf("hammer_destroy_inode_callback: Unexpected "
1564 "vnode association ip %p vp %p\n", ip, ip->vp);
1565 ip->vp->v_data = NULL;
1568 hammer_ref(&ip->lock);
1570 hammer_unload_inode(ip);
1575 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1576 * the read-only flag for cached inodes.
1578 * This routine is called from a RB_SCAN().
1581 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
1583 hammer_mount_t hmp = ip->hmp;
1585 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
1586 ip->flags |= HAMMER_INODE_RO;
1588 ip->flags &= ~HAMMER_INODE_RO;
1593 * A transaction has modified an inode, requiring updates as specified by
1596 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime,
1597 * and not including size changes due to write-append
1598 * (but other size changes are included).
1599 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to
1601 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1602 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1603 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1604 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1607 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags)
1610 * ronly of 0 or 2 does not trigger assertion.
1611 * 2 is a special error state
1613 KKASSERT(ip->hmp->ronly != 1 ||
1614 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
1615 HAMMER_INODE_SDIRTY |
1616 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED |
1617 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0);
1618 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
1619 ip->flags |= HAMMER_INODE_RSV_INODES;
1620 ++ip->hmp->rsv_inodes;
1624 * Set the NEWINODE flag in the transaction if the inode
1625 * transitions to a dirty state. This is used to track
1626 * the load on the inode cache.
1629 (ip->flags & HAMMER_INODE_MODMASK) == 0 &&
1630 (flags & HAMMER_INODE_MODMASK)) {
1631 trans->flags |= HAMMER_TRANSF_NEWINODE;
1638 * Request that an inode be flushed. This whole mess cannot block and may
1639 * recurse (if not synchronous). Once requested HAMMER will attempt to
1640 * actively flush the inode until the flush can be done.
1642 * The inode may already be flushing, or may be in a setup state. We can
1643 * place the inode in a flushing state if it is currently idle and flag it
1644 * to reflush if it is currently flushing.
1646 * Upon return if the inode could not be flushed due to a setup
1647 * dependancy, then it will be automatically flushed when the dependancy
1651 hammer_flush_inode(hammer_inode_t ip, int flags)
1654 hammer_flush_group_t flg;
1658 * fill_flush_group is the first flush group we may be able to
1659 * continue filling, it may be open or closed but it will always
1660 * be past the currently flushing (running) flg.
1662 * next_flush_group is the next open flush group.
1665 while ((flg = hmp->fill_flush_group) != NULL) {
1666 KKASSERT(flg->running == 0);
1667 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit &&
1668 flg->total_count <= hammer_autoflush) {
1671 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
1672 hammer_flusher_async(ip->hmp, flg);
1675 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO);
1676 flg->seq = hmp->flusher.next++;
1677 if (hmp->next_flush_group == NULL)
1678 hmp->next_flush_group = flg;
1679 if (hmp->fill_flush_group == NULL)
1680 hmp->fill_flush_group = flg;
1681 RB_INIT(&flg->flush_tree);
1682 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry);
1686 * Trivial 'nothing to flush' case. If the inode is in a SETUP
1687 * state we have to put it back into an IDLE state so we can
1688 * drop the extra ref.
1690 * If we have a parent dependancy we must still fall through
1693 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
1694 if (ip->flush_state == HAMMER_FST_SETUP &&
1695 TAILQ_EMPTY(&ip->target_list)) {
1696 ip->flush_state = HAMMER_FST_IDLE;
1697 hammer_rel_inode(ip, 0);
1699 if (ip->flush_state == HAMMER_FST_IDLE)
1704 * Our flush action will depend on the current state.
1706 switch(ip->flush_state) {
1707 case HAMMER_FST_IDLE:
1709 * We have no dependancies and can flush immediately. Some
1710 * our children may not be flushable so we have to re-test
1711 * with that additional knowledge.
1713 hammer_flush_inode_core(ip, flg, flags);
1715 case HAMMER_FST_SETUP:
1717 * Recurse upwards through dependancies via target_list
1718 * and start their flusher actions going if possible.
1720 * 'good' is our connectivity. -1 means we have none and
1721 * can't flush, 0 means there weren't any dependancies, and
1722 * 1 means we have good connectivity.
1724 good = hammer_setup_parent_inodes(ip, 0, flg);
1728 * We can continue if good >= 0. Determine how
1729 * many records under our inode can be flushed (and
1732 hammer_flush_inode_core(ip, flg, flags);
1735 * Parent has no connectivity, tell it to flush
1736 * us as soon as it does.
1738 * The REFLUSH flag is also needed to trigger
1739 * dependancy wakeups.
1741 ip->flags |= HAMMER_INODE_CONN_DOWN |
1742 HAMMER_INODE_REFLUSH;
1743 if (flags & HAMMER_FLUSH_SIGNAL) {
1744 ip->flags |= HAMMER_INODE_RESIGNAL;
1745 hammer_flusher_async(ip->hmp, flg);
1749 case HAMMER_FST_FLUSH:
1751 * We are already flushing, flag the inode to reflush
1752 * if needed after it completes its current flush.
1754 * The REFLUSH flag is also needed to trigger
1755 * dependancy wakeups.
1757 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
1758 ip->flags |= HAMMER_INODE_REFLUSH;
1759 if (flags & HAMMER_FLUSH_SIGNAL) {
1760 ip->flags |= HAMMER_INODE_RESIGNAL;
1761 hammer_flusher_async(ip->hmp, flg);
1768 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1769 * ip which reference our ip.
1771 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1772 * so for now do not ref/deref the structures. Note that if we use the
1773 * ref/rel code later, the rel CAN block.
1776 hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
1777 hammer_flush_group_t flg)
1779 hammer_record_t depend;
1784 * If we hit our recursion limit and we have parent dependencies
1785 * We cannot continue. Returning < 0 will cause us to be flagged
1786 * for reflush. Returning -2 cuts off additional dependency checks
1787 * because they are likely to also hit the depth limit.
1789 * We cannot return < 0 if there are no dependencies or there might
1790 * not be anything to wakeup (ip).
1792 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) {
1793 kprintf("HAMMER Warning: depth limit reached on "
1794 "setup recursion, inode %p %016llx\n",
1795 ip, (long long)ip->obj_id);
1803 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
1804 r = hammer_setup_parent_inodes_helper(depend, depth, flg);
1805 KKASSERT(depend->target_ip == ip);
1806 if (r < 0 && good == 0)
1812 * If we failed due to the recursion depth limit then stop
1822 * This helper function takes a record representing the dependancy between
1823 * the parent inode and child inode.
1825 * record->ip = parent inode
1826 * record->target_ip = child inode
1828 * We are asked to recurse upwards and convert the record from SETUP
1829 * to FLUSH if possible.
1831 * Return 1 if the record gives us connectivity
1833 * Return 0 if the record is not relevant
1835 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1838 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth,
1839 hammer_flush_group_t flg)
1845 KKASSERT(record->flush_state != HAMMER_FST_IDLE);
1850 * If the record is already flushing, is it in our flush group?
1852 * If it is in our flush group but it is a general record or a
1853 * delete-on-disk, it does not improve our connectivity (return 0),
1854 * and if the target inode is not trying to destroy itself we can't
1855 * allow the operation yet anyway (the second return -1).
1857 if (record->flush_state == HAMMER_FST_FLUSH) {
1859 * If not in our flush group ask the parent to reflush
1860 * us as soon as possible.
1862 if (record->flush_group != flg) {
1863 pip->flags |= HAMMER_INODE_REFLUSH;
1864 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1869 * If in our flush group everything is already set up,
1870 * just return whether the record will improve our
1871 * visibility or not.
1873 if (record->type == HAMMER_MEM_RECORD_ADD)
1879 * It must be a setup record. Try to resolve the setup dependancies
1880 * by recursing upwards so we can place ip on the flush list.
1882 * Limit ourselves to 20 levels of recursion to avoid blowing out
1883 * the kernel stack. If we hit the recursion limit we can't flush
1884 * until the parent flushes. The parent will flush independantly
1885 * on its own and ultimately a deep recursion will be resolved.
1887 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1889 good = hammer_setup_parent_inodes(pip, depth + 1, flg);
1892 * If good < 0 the parent has no connectivity and we cannot safely
1893 * flush the directory entry, which also means we can't flush our
1894 * ip. Flag us for downward recursion once the parent's
1895 * connectivity is resolved. Flag the parent for [re]flush or it
1896 * may not check for downward recursions.
1899 pip->flags |= HAMMER_INODE_REFLUSH;
1900 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1905 * We are go, place the parent inode in a flushing state so we can
1906 * place its record in a flushing state. Note that the parent
1907 * may already be flushing. The record must be in the same flush
1908 * group as the parent.
1910 if (pip->flush_state != HAMMER_FST_FLUSH)
1911 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION);
1912 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH);
1915 * It is possible for a rename to create a loop in the recursion
1916 * and revisit a record. This will result in the record being
1917 * placed in a flush state unexpectedly. This check deals with
1920 if (record->flush_state == HAMMER_FST_FLUSH) {
1921 if (record->type == HAMMER_MEM_RECORD_ADD)
1926 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1929 if (record->type == HAMMER_MEM_RECORD_DEL &&
1930 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
1932 * Regardless of flushing state we cannot sync this path if the
1933 * record represents a delete-on-disk but the target inode
1934 * is not ready to sync its own deletion.
1936 * XXX need to count effective nlinks to determine whether
1937 * the flush is ok, otherwise removing a hardlink will
1938 * just leave the DEL record to rot.
1940 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
1944 if (pip->flush_group == flg) {
1946 * Because we have not calculated nlinks yet we can just
1947 * set records to the flush state if the parent is in
1948 * the same flush group as we are.
1950 record->flush_state = HAMMER_FST_FLUSH;
1951 record->flush_group = flg;
1952 ++record->flush_group->refs;
1953 hammer_ref(&record->lock);
1956 * A general directory-add contributes to our visibility.
1958 * Otherwise it is probably a directory-delete or
1959 * delete-on-disk record and does not contribute to our
1960 * visbility (but we can still flush it).
1962 if (record->type == HAMMER_MEM_RECORD_ADD)
1967 * If the parent is not in our flush group we cannot
1968 * flush this record yet, there is no visibility.
1969 * We tell the parent to reflush and mark ourselves
1970 * so the parent knows it should flush us too.
1972 pip->flags |= HAMMER_INODE_REFLUSH;
1973 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1979 * This is the core routine placing an inode into the FST_FLUSH state.
1982 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags)
1984 hammer_mount_t hmp = ip->hmp;
1988 * Set flush state and prevent the flusher from cycling into
1989 * the next flush group. Do not place the ip on the list yet.
1990 * Inodes not in the idle state get an extra reference.
1992 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
1993 if (ip->flush_state == HAMMER_FST_IDLE)
1994 hammer_ref(&ip->lock);
1995 ip->flush_state = HAMMER_FST_FLUSH;
1996 ip->flush_group = flg;
1997 ++hmp->flusher.group_lock;
1998 ++hmp->count_iqueued;
1999 ++hammer_count_iqueued;
2001 hammer_redo_fifo_start_flush(ip);
2005 * We need to be able to vfsync/truncate from the backend.
2007 * XXX Any truncation from the backend will acquire the vnode
2010 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
2011 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
2012 ip->flags |= HAMMER_INODE_VHELD;
2018 * Figure out how many in-memory records we can actually flush
2019 * (not including inode meta-data, buffers, etc).
2021 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0);
2022 if (flags & HAMMER_FLUSH_RECURSION) {
2024 * If this is a upwards recursion we do not want to
2025 * recurse down again!
2029 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2031 * No new records are added if we must complete a flush
2032 * from a previous cycle, but we do have to move the records
2033 * from the previous cycle to the current one.
2036 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2037 hammer_syncgrp_child_callback, NULL);
2043 * Normal flush, scan records and bring them into the flush.
2044 * Directory adds and deletes are usually skipped (they are
2045 * grouped with the related inode rather then with the
2048 * go_count can be negative, which means the scan aborted
2049 * due to the flush group being over-full and we should
2050 * flush what we have.
2052 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2053 hammer_setup_child_callback, NULL);
2057 * This is a more involved test that includes go_count. If we
2058 * can't flush, flag the inode and return. If go_count is 0 we
2059 * were are unable to flush any records in our rec_tree and
2060 * must ignore the XDIRTY flag.
2062 if (go_count == 0) {
2063 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
2064 --hmp->count_iqueued;
2065 --hammer_count_iqueued;
2068 ip->flush_state = HAMMER_FST_SETUP;
2069 ip->flush_group = NULL;
2070 if (flags & HAMMER_FLUSH_SIGNAL) {
2071 ip->flags |= HAMMER_INODE_REFLUSH |
2072 HAMMER_INODE_RESIGNAL;
2074 ip->flags |= HAMMER_INODE_REFLUSH;
2077 if (ip->flags & HAMMER_INODE_VHELD) {
2078 ip->flags &= ~HAMMER_INODE_VHELD;
2084 * REFLUSH is needed to trigger dependancy wakeups
2085 * when an inode is in SETUP.
2087 ip->flags |= HAMMER_INODE_REFLUSH;
2088 if (--hmp->flusher.group_lock == 0)
2089 wakeup(&hmp->flusher.group_lock);
2095 * Snapshot the state of the inode for the backend flusher.
2097 * We continue to retain save_trunc_off even when all truncations
2098 * have been resolved as an optimization to determine if we can
2099 * skip the B-Tree lookup for overwrite deletions.
2101 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
2102 * and stays in ip->flags. Once set, it stays set until the
2103 * inode is destroyed.
2105 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2106 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0);
2107 ip->sync_trunc_off = ip->trunc_off;
2108 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
2109 ip->flags &= ~HAMMER_INODE_TRUNCATED;
2110 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
2113 * The save_trunc_off used to cache whether the B-Tree
2114 * holds any records past that point is not used until
2115 * after the truncation has succeeded, so we can safely
2118 if (ip->save_trunc_off > ip->sync_trunc_off)
2119 ip->save_trunc_off = ip->sync_trunc_off;
2121 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK &
2122 ~HAMMER_INODE_TRUNCATED);
2123 ip->sync_ino_leaf = ip->ino_leaf;
2124 ip->sync_ino_data = ip->ino_data;
2125 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED;
2126 #ifdef DEBUG_TRUNCATE
2127 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp)
2128 kprintf("truncateS %016llx\n", ip->sync_trunc_off);
2132 * The flusher list inherits our inode and reference.
2134 KKASSERT(flg->running == 0);
2135 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip);
2136 if (--hmp->flusher.group_lock == 0)
2137 wakeup(&hmp->flusher.group_lock);
2140 * Auto-flush the group if it grows too large. Make sure the
2141 * inode reclaim wait pipeline continues to work.
2143 if (flg->total_count >= hammer_autoflush ||
2144 flg->total_count >= hammer_limit_reclaim / 4) {
2145 if (hmp->fill_flush_group == flg)
2146 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
2147 hammer_flusher_async(hmp, flg);
2152 * Callback for scan of ip->rec_tree. Try to include each record in our
2153 * flush. ip->flush_group has been set but the inode has not yet been
2154 * moved into a flushing state.
2156 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
2159 * We return 1 for any record placed or found in FST_FLUSH, which prevents
2160 * the caller from shortcutting the flush.
2163 hammer_setup_child_callback(hammer_record_t rec, void *data)
2165 hammer_flush_group_t flg;
2166 hammer_inode_t target_ip;
2171 * Records deleted or committed by the backend are ignored.
2172 * Note that the flush detects deleted frontend records at
2173 * multiple points to deal with races. This is just the first
2174 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot
2175 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it
2176 * messes up link-count calculations.
2178 * NOTE: Don't get confused between record deletion and, say,
2179 * directory entry deletion. The deletion of a directory entry
2180 * which is on-media has nothing to do with the record deletion
2183 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE |
2184 HAMMER_RECF_COMMITTED)) {
2185 if (rec->flush_state == HAMMER_FST_FLUSH) {
2186 KKASSERT(rec->flush_group == rec->ip->flush_group);
2195 * If the record is in an idle state it has no dependancies and
2199 flg = ip->flush_group;
2202 switch(rec->flush_state) {
2203 case HAMMER_FST_IDLE:
2205 * The record has no setup dependancy, we can flush it.
2207 KKASSERT(rec->target_ip == NULL);
2208 rec->flush_state = HAMMER_FST_FLUSH;
2209 rec->flush_group = flg;
2211 hammer_ref(&rec->lock);
2214 case HAMMER_FST_SETUP:
2216 * The record has a setup dependancy. These are typically
2217 * directory entry adds and deletes. Such entries will be
2218 * flushed when their inodes are flushed so we do not
2219 * usually have to add them to the flush here. However,
2220 * if the target_ip has set HAMMER_INODE_CONN_DOWN then
2221 * it is asking us to flush this record (and it).
2223 target_ip = rec->target_ip;
2224 KKASSERT(target_ip != NULL);
2225 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
2228 * If the target IP is already flushing in our group
2229 * we could associate the record, but target_ip has
2230 * already synced ino_data to sync_ino_data and we
2231 * would also have to adjust nlinks. Plus there are
2232 * ordering issues for adds and deletes.
2234 * Reflush downward if this is an ADD, and upward if
2237 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
2238 if (rec->flush_state == HAMMER_MEM_RECORD_ADD)
2239 ip->flags |= HAMMER_INODE_REFLUSH;
2241 target_ip->flags |= HAMMER_INODE_REFLUSH;
2246 * Target IP is not yet flushing. This can get complex
2247 * because we have to be careful about the recursion.
2249 * Directories create an issue for us in that if a flush
2250 * of a directory is requested the expectation is to flush
2251 * any pending directory entries, but this will cause the
2252 * related inodes to recursively flush as well. We can't
2253 * really defer the operation so just get as many as we
2257 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 &&
2258 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) {
2260 * We aren't reclaiming and the target ip was not
2261 * previously prevented from flushing due to this
2262 * record dependancy. Do not flush this record.
2267 if (flg->total_count + flg->refs >
2268 ip->hmp->undo_rec_limit) {
2270 * Our flush group is over-full and we risk blowing
2271 * out the UNDO FIFO. Stop the scan, flush what we
2272 * have, then reflush the directory.
2274 * The directory may be forced through multiple
2275 * flush groups before it can be completely
2278 ip->flags |= HAMMER_INODE_RESIGNAL |
2279 HAMMER_INODE_REFLUSH;
2281 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
2283 * If the target IP is not flushing we can force
2284 * it to flush, even if it is unable to write out
2285 * any of its own records we have at least one in
2286 * hand that we CAN deal with.
2288 rec->flush_state = HAMMER_FST_FLUSH;
2289 rec->flush_group = flg;
2291 hammer_ref(&rec->lock);
2292 hammer_flush_inode_core(target_ip, flg,
2293 HAMMER_FLUSH_RECURSION);
2297 * General or delete-on-disk record.
2299 * XXX this needs help. If a delete-on-disk we could
2300 * disconnect the target. If the target has its own
2301 * dependancies they really need to be flushed.
2305 rec->flush_state = HAMMER_FST_FLUSH;
2306 rec->flush_group = flg;
2308 hammer_ref(&rec->lock);
2309 hammer_flush_inode_core(target_ip, flg,
2310 HAMMER_FLUSH_RECURSION);
2314 case HAMMER_FST_FLUSH:
2316 * The record could be part of a previous flush group if the
2317 * inode is a directory (the record being a directory entry).
2318 * Once the flush group was closed a hammer_test_inode()
2319 * function can cause a new flush group to be setup, placing
2320 * the directory inode itself in a new flush group.
2322 * When associated with a previous flush group we count it
2323 * as if it were in our current flush group, since it will
2324 * effectively be flushed by the time we flush our current
2328 rec->ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY ||
2329 rec->flush_group == flg);
2338 * This version just moves records already in a flush state to the new
2339 * flush group and that is it.
2342 hammer_syncgrp_child_callback(hammer_record_t rec, void *data)
2344 hammer_inode_t ip = rec->ip;
2346 switch(rec->flush_state) {
2347 case HAMMER_FST_FLUSH:
2348 KKASSERT(rec->flush_group == ip->flush_group);
2358 * Wait for a previously queued flush to complete.
2360 * If a critical error occured we don't try to wait.
2363 hammer_wait_inode(hammer_inode_t ip)
2365 hammer_flush_group_t flg;
2368 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) {
2369 while (ip->flush_state != HAMMER_FST_IDLE &&
2370 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) {
2371 if (ip->flush_state == HAMMER_FST_SETUP)
2372 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2375 * If the inode was already being flushed its flg
2376 * may not have been queued to the backend. We have
2377 * to make sure it gets queued or we can wind up
2378 * blocked or deadlocked (particularly if we are
2379 * the vnlru thread).
2381 KKASSERT(ip->flush_group);
2382 if (ip->flush_group->closed == 0) {
2383 kprintf("hammer: debug: forcing async "
2384 "flush ip %016jx\n",
2385 (intmax_t)ip->obj_id);
2386 hammer_flusher_async(ip->hmp, ip->flush_group);
2388 if (ip->flush_state != HAMMER_FST_IDLE) {
2389 ip->flags |= HAMMER_INODE_FLUSHW;
2390 tsleep(&ip->flags, 0, "hmrwin", 0);
2397 * Called by the backend code when a flush has been completed.
2398 * The inode has already been removed from the flush list.
2400 * A pipelined flush can occur, in which case we must re-enter the
2401 * inode on the list and re-copy its fields.
2404 hammer_flush_inode_done(hammer_inode_t ip, int error)
2409 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
2414 * Auto-reflush if the backend could not completely flush
2415 * the inode. This fixes a case where a deferred buffer flush
2416 * could cause fsync to return early.
2418 if (ip->sync_flags & HAMMER_INODE_MODMASK)
2419 ip->flags |= HAMMER_INODE_REFLUSH;
2422 * Merge left-over flags back into the frontend and fix the state.
2423 * Incomplete truncations are retained by the backend.
2426 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED;
2427 ip->sync_flags &= HAMMER_INODE_TRUNCATED;
2430 * The backend may have adjusted nlinks, so if the adjusted nlinks
2431 * does not match the fronttend set the frontend's DDIRTY flag again.
2433 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
2434 ip->flags |= HAMMER_INODE_DDIRTY;
2437 * Fix up the dirty buffer status.
2439 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
2440 ip->flags |= HAMMER_INODE_BUFS;
2442 hammer_redo_fifo_end_flush(ip);
2445 * Re-set the XDIRTY flag if some of the inode's in-memory records
2446 * could not be flushed.
2448 KKASSERT((RB_EMPTY(&ip->rec_tree) &&
2449 (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
2450 (!RB_EMPTY(&ip->rec_tree) &&
2451 (ip->flags & HAMMER_INODE_XDIRTY) != 0));
2454 * Do not lose track of inodes which no longer have vnode
2455 * assocations, otherwise they may never get flushed again.
2457 * The reflush flag can be set superfluously, causing extra pain
2458 * for no reason. If the inode is no longer modified it no longer
2459 * needs to be flushed.
2461 if (ip->flags & HAMMER_INODE_MODMASK) {
2463 ip->flags |= HAMMER_INODE_REFLUSH;
2465 ip->flags &= ~HAMMER_INODE_REFLUSH;
2469 * Adjust the flush state.
2471 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2473 * We were unable to flush out all our records, leave the
2474 * inode in a flush state and in the current flush group.
2475 * The flush group will be re-run.
2477 * This occurs if the UNDO block gets too full or there is
2478 * too much dirty meta-data and allows the flusher to
2479 * finalize the UNDO block and then re-flush.
2481 ip->flags &= ~HAMMER_INODE_WOULDBLOCK;
2485 * Remove from the flush_group
2487 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
2488 ip->flush_group = NULL;
2492 * Clean up the vnode ref and tracking counts.
2494 if (ip->flags & HAMMER_INODE_VHELD) {
2495 ip->flags &= ~HAMMER_INODE_VHELD;
2499 --hmp->count_iqueued;
2500 --hammer_count_iqueued;
2503 * And adjust the state.
2505 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
2506 ip->flush_state = HAMMER_FST_IDLE;
2509 ip->flush_state = HAMMER_FST_SETUP;
2514 * If the frontend is waiting for a flush to complete,
2517 if (ip->flags & HAMMER_INODE_FLUSHW) {
2518 ip->flags &= ~HAMMER_INODE_FLUSHW;
2523 * If the frontend made more changes and requested another
2524 * flush, then try to get it running.
2526 * Reflushes are aborted when the inode is errored out.
2528 if (ip->flags & HAMMER_INODE_REFLUSH) {
2529 ip->flags &= ~HAMMER_INODE_REFLUSH;
2530 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2531 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2532 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2534 hammer_flush_inode(ip, 0);
2540 * If we have no parent dependancies we can clear CONN_DOWN
2542 if (TAILQ_EMPTY(&ip->target_list))
2543 ip->flags &= ~HAMMER_INODE_CONN_DOWN;
2546 * If the inode is now clean drop the space reservation.
2548 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
2549 (ip->flags & HAMMER_INODE_RSV_INODES)) {
2550 ip->flags &= ~HAMMER_INODE_RSV_INODES;
2555 hammer_rel_inode(ip, 0);
2559 * Called from hammer_sync_inode() to synchronize in-memory records
2563 hammer_sync_record_callback(hammer_record_t record, void *data)
2565 hammer_cursor_t cursor = data;
2566 hammer_transaction_t trans = cursor->trans;
2567 hammer_mount_t hmp = trans->hmp;
2571 * Skip records that do not belong to the current flush.
2573 ++hammer_stats_record_iterations;
2574 if (record->flush_state != HAMMER_FST_FLUSH)
2578 if (record->flush_group != record->ip->flush_group) {
2579 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group);
2580 if (hammer_debug_critical)
2585 KKASSERT(record->flush_group == record->ip->flush_group);
2588 * Interlock the record using the BE flag. Once BE is set the
2589 * frontend cannot change the state of FE.
2591 * NOTE: If FE is set prior to us setting BE we still sync the
2592 * record out, but the flush completion code converts it to
2593 * a delete-on-disk record instead of destroying it.
2595 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
2596 record->flags |= HAMMER_RECF_INTERLOCK_BE;
2599 * The backend has already disposed of the record.
2601 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) {
2607 * If the whole inode is being deleting all on-disk records will
2608 * be deleted very soon, we can't sync any new records to disk
2609 * because they will be deleted in the same transaction they were
2610 * created in (delete_tid == create_tid), which will assert.
2612 * XXX There may be a case with RECORD_ADD with DELETED_FE set
2613 * that we currently panic on.
2615 if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
2616 switch(record->type) {
2617 case HAMMER_MEM_RECORD_DATA:
2619 * We don't have to do anything, if the record was
2620 * committed the space will have been accounted for
2624 case HAMMER_MEM_RECORD_GENERAL:
2626 * Set deleted-by-backend flag. Do not set the
2627 * backend committed flag, because we are throwing
2630 record->flags |= HAMMER_RECF_DELETED_BE;
2631 ++record->ip->rec_generation;
2634 case HAMMER_MEM_RECORD_ADD:
2635 panic("hammer_sync_record_callback: illegal add "
2636 "during inode deletion record %p", record);
2637 break; /* NOT REACHED */
2638 case HAMMER_MEM_RECORD_INODE:
2639 panic("hammer_sync_record_callback: attempt to "
2640 "sync inode record %p?", record);
2641 break; /* NOT REACHED */
2642 case HAMMER_MEM_RECORD_DEL:
2644 * Follow through and issue the on-disk deletion
2651 * If DELETED_FE is set special handling is needed for directory
2652 * entries. Dependant pieces related to the directory entry may
2653 * have already been synced to disk. If this occurs we have to
2654 * sync the directory entry and then change the in-memory record
2655 * from an ADD to a DELETE to cover the fact that it's been
2656 * deleted by the frontend.
2658 * A directory delete covering record (MEM_RECORD_DEL) can never
2659 * be deleted by the frontend.
2661 * Any other record type (aka DATA) can be deleted by the frontend.
2662 * XXX At the moment the flusher must skip it because there may
2663 * be another data record in the flush group for the same block,
2664 * meaning that some frontend data changes can leak into the backend's
2665 * synchronization point.
2667 if (record->flags & HAMMER_RECF_DELETED_FE) {
2668 if (record->type == HAMMER_MEM_RECORD_ADD) {
2670 * Convert a front-end deleted directory-add to
2671 * a directory-delete entry later.
2673 record->flags |= HAMMER_RECF_CONVERT_DELETE;
2676 * Dispose of the record (race case). Mark as
2677 * deleted by backend (and not committed).
2679 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
2680 record->flags |= HAMMER_RECF_DELETED_BE;
2681 ++record->ip->rec_generation;
2688 * Assign the create_tid for new records. Deletions already
2689 * have the record's entire key properly set up.
2691 if (record->type != HAMMER_MEM_RECORD_DEL) {
2692 record->leaf.base.create_tid = trans->tid;
2693 record->leaf.create_ts = trans->time32;
2697 * This actually moves the record to the on-media B-Tree. We
2698 * must also generate REDO_TERM entries in the UNDO/REDO FIFO
2699 * indicating that the related REDO_WRITE(s) have been committed.
2701 * During recovery any REDO_TERM's within the nominal recovery span
2702 * are ignored since the related meta-data is being undone, causing
2703 * any matching REDO_WRITEs to execute. The REDO_TERMs outside
2704 * the nominal recovery span will match against REDO_WRITEs and
2705 * prevent them from being executed (because the meta-data has
2706 * already been synchronized).
2708 if (record->flags & HAMMER_RECF_REDO) {
2709 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA);
2710 hammer_generate_redo(trans, record->ip,
2711 record->leaf.base.key -
2712 record->leaf.data_len,
2713 HAMMER_REDO_TERM_WRITE,
2715 record->leaf.data_len);
2718 error = hammer_ip_sync_record_cursor(cursor, record);
2719 if (error != EDEADLK)
2721 hammer_done_cursor(cursor);
2722 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
2727 record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
2732 hammer_flush_record_done(record, error);
2735 * Do partial finalization if we have built up too many dirty
2736 * buffers. Otherwise a buffer cache deadlock can occur when
2737 * doing things like creating tens of thousands of tiny files.
2739 * We must release our cursor lock to avoid a 3-way deadlock
2740 * due to the exclusive sync lock the finalizer must get.
2742 * WARNING: See warnings in hammer_unlock_cursor() function.
2744 if (hammer_flusher_meta_limit(hmp)) {
2745 hammer_unlock_cursor(cursor);
2746 hammer_flusher_finalize(trans, 0);
2747 hammer_lock_cursor(cursor);
2754 * Backend function called by the flusher to sync an inode to media.
2757 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip)
2759 struct hammer_cursor cursor;
2760 hammer_node_t tmp_node;
2761 hammer_record_t depend;
2762 hammer_record_t next;
2763 int error, tmp_error;
2766 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
2769 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
2774 * Any directory records referencing this inode which are not in
2775 * our current flush group must adjust our nlink count for the
2776 * purposes of synchronizating to disk.
2778 * Records which are in our flush group can be unlinked from our
2779 * inode now, potentially allowing the inode to be physically
2782 * This cannot block.
2784 nlinks = ip->ino_data.nlinks;
2785 next = TAILQ_FIRST(&ip->target_list);
2786 while ((depend = next) != NULL) {
2787 next = TAILQ_NEXT(depend, target_entry);
2788 if (depend->flush_state == HAMMER_FST_FLUSH &&
2789 depend->flush_group == ip->flush_group) {
2791 * If this is an ADD that was deleted by the frontend
2792 * the frontend nlinks count will have already been
2793 * decremented, but the backend is going to sync its
2794 * directory entry and must account for it. The
2795 * record will be converted to a delete-on-disk when
2798 * If the ADD was not deleted by the frontend we
2799 * can remove the dependancy from our target_list.
2801 if (depend->flags & HAMMER_RECF_DELETED_FE) {
2804 TAILQ_REMOVE(&ip->target_list, depend,
2806 depend->target_ip = NULL;
2808 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
2810 * Not part of our flush group and not deleted by
2811 * the front-end, adjust the link count synced to
2812 * the media (undo what the frontend did when it
2813 * queued the record).
2815 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
2816 switch(depend->type) {
2817 case HAMMER_MEM_RECORD_ADD:
2820 case HAMMER_MEM_RECORD_DEL:
2830 * Set dirty if we had to modify the link count.
2832 if (ip->sync_ino_data.nlinks != nlinks) {
2833 KKASSERT((int64_t)nlinks >= 0);
2834 ip->sync_ino_data.nlinks = nlinks;
2835 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2839 * If there is a trunction queued destroy any data past the (aligned)
2840 * truncation point. Userland will have dealt with the buffer
2841 * containing the truncation point for us.
2843 * We don't flush pending frontend data buffers until after we've
2844 * dealt with the truncation.
2846 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2848 * Interlock trunc_off. The VOP front-end may continue to
2849 * make adjustments to it while we are blocked.
2852 off_t aligned_trunc_off;
2855 trunc_off = ip->sync_trunc_off;
2856 blkmask = hammer_blocksize(trunc_off) - 1;
2857 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask;
2860 * Delete any whole blocks on-media. The front-end has
2861 * already cleaned out any partial block and made it
2862 * pending. The front-end may have updated trunc_off
2863 * while we were blocked so we only use sync_trunc_off.
2865 * This operation can blow out the buffer cache, EWOULDBLOCK
2866 * means we were unable to complete the deletion. The
2867 * deletion will update sync_trunc_off in that case.
2869 error = hammer_ip_delete_range(&cursor, ip,
2871 0x7FFFFFFFFFFFFFFFLL, 2);
2872 if (error == EWOULDBLOCK) {
2873 ip->flags |= HAMMER_INODE_WOULDBLOCK;
2875 goto defer_buffer_flush;
2882 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO.
2884 * XXX we do this even if we did not previously generate
2885 * a REDO_TRUNC record. This operation may enclosed the
2886 * range for multiple prior truncation entries in the REDO
2889 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR &&
2890 (ip->flags & HAMMER_INODE_RDIRTY)) {
2891 hammer_generate_redo(trans, ip, aligned_trunc_off,
2892 HAMMER_REDO_TERM_TRUNC,
2897 * Clear the truncation flag on the backend after we have
2898 * completed the deletions. Backend data is now good again
2899 * (including new records we are about to sync, below).
2901 * Leave sync_trunc_off intact. As we write additional
2902 * records the backend will update sync_trunc_off. This
2903 * tells the backend whether it can skip the overwrite
2904 * test. This should work properly even when the backend
2905 * writes full blocks where the truncation point straddles
2906 * the block because the comparison is against the base
2907 * offset of the record.
2909 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2910 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */
2916 * Now sync related records. These will typically be directory
2917 * entries, records tracking direct-writes, or delete-on-disk records.
2920 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2921 hammer_sync_record_callback, &cursor);
2927 hammer_cache_node(&ip->cache[1], cursor.node);
2930 * Re-seek for inode update, assuming our cache hasn't been ripped
2931 * out from under us.
2934 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error);
2936 hammer_cursor_downgrade(&cursor);
2937 hammer_lock_sh(&tmp_node->lock);
2938 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0)
2939 hammer_cursor_seek(&cursor, tmp_node, 0);
2940 hammer_unlock(&tmp_node->lock);
2941 hammer_rel_node(tmp_node);
2947 * If we are deleting the inode the frontend had better not have
2948 * any active references on elements making up the inode.
2950 * The call to hammer_ip_delete_clean() cleans up auxillary records
2951 * but not DB or DATA records. Those must have already been deleted
2952 * by the normal truncation mechanic.
2954 if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
2955 RB_EMPTY(&ip->rec_tree) &&
2956 (ip->sync_flags & HAMMER_INODE_DELETING) &&
2957 (ip->flags & HAMMER_INODE_DELETED) == 0) {
2960 error = hammer_ip_delete_clean(&cursor, ip, &count1);
2962 ip->flags |= HAMMER_INODE_DELETED;
2963 ip->sync_flags &= ~HAMMER_INODE_DELETING;
2964 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2965 KKASSERT(RB_EMPTY(&ip->rec_tree));
2968 * Set delete_tid in both the frontend and backend
2969 * copy of the inode record. The DELETED flag handles
2970 * this, do not set DDIRTY.
2972 ip->ino_leaf.base.delete_tid = trans->tid;
2973 ip->sync_ino_leaf.base.delete_tid = trans->tid;
2974 ip->ino_leaf.delete_ts = trans->time32;
2975 ip->sync_ino_leaf.delete_ts = trans->time32;
2979 * Adjust the inode count in the volume header
2981 hammer_sync_lock_sh(trans);
2982 if (ip->flags & HAMMER_INODE_ONDISK) {
2983 hammer_modify_volume_field(trans,
2986 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
2987 hammer_modify_volume_done(trans->rootvol);
2989 hammer_sync_unlock(trans);
2995 ip->sync_flags &= ~HAMMER_INODE_BUFS;
2999 * Now update the inode's on-disk inode-data and/or on-disk record.
3000 * DELETED and ONDISK are managed only in ip->flags.
3002 * In the case of a defered buffer flush we still update the on-disk
3003 * inode to satisfy visibility requirements if there happen to be
3004 * directory dependancies.
3006 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
3007 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
3009 * If deleted and on-disk, don't set any additional flags.
3010 * the delete flag takes care of things.
3012 * Clear flags which may have been set by the frontend.
3014 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3015 HAMMER_INODE_SDIRTY |
3016 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3017 HAMMER_INODE_DELETING);
3019 case HAMMER_INODE_DELETED:
3021 * Take care of the case where a deleted inode was never
3022 * flushed to the disk in the first place.
3024 * Clear flags which may have been set by the frontend.
3026 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3027 HAMMER_INODE_SDIRTY |
3028 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3029 HAMMER_INODE_DELETING);
3030 while (RB_ROOT(&ip->rec_tree)) {
3031 hammer_record_t record = RB_ROOT(&ip->rec_tree);
3032 hammer_ref(&record->lock);
3033 KKASSERT(hammer_oneref(&record->lock));
3034 record->flags |= HAMMER_RECF_DELETED_BE;
3035 ++record->ip->rec_generation;
3036 hammer_rel_mem_record(record);
3039 case HAMMER_INODE_ONDISK:
3041 * If already on-disk, do not set any additional flags.
3046 * If not on-disk and not deleted, set DDIRTY to force
3047 * an initial record to be written.
3049 * Also set the create_tid in both the frontend and backend
3050 * copy of the inode record.
3052 ip->ino_leaf.base.create_tid = trans->tid;
3053 ip->ino_leaf.create_ts = trans->time32;
3054 ip->sync_ino_leaf.base.create_tid = trans->tid;
3055 ip->sync_ino_leaf.create_ts = trans->time32;
3056 ip->sync_flags |= HAMMER_INODE_DDIRTY;
3061 * If DDIRTY or SDIRTY is set, write out a new record.
3062 * If the inode is already on-disk the old record is marked as
3065 * If DELETED is set hammer_update_inode() will delete the existing
3066 * record without writing out a new one.
3068 * If *ONLY* the ITIMES flag is set we can update the record in-place.
3070 if (ip->flags & HAMMER_INODE_DELETED) {
3071 error = hammer_update_inode(&cursor, ip);
3073 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) &&
3074 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) {
3075 error = hammer_update_itimes(&cursor, ip);
3077 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY |
3078 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
3079 error = hammer_update_inode(&cursor, ip);
3083 hammer_critical_error(ip->hmp, ip, error,
3084 "while syncing inode");
3086 hammer_done_cursor(&cursor);
3091 * This routine is called when the OS is no longer actively referencing
3092 * the inode (but might still be keeping it cached), or when releasing
3093 * the last reference to an inode.
3095 * At this point if the inode's nlinks count is zero we want to destroy
3096 * it, which may mean destroying it on-media too.
3099 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
3104 * Set the DELETING flag when the link count drops to 0 and the
3105 * OS no longer has any opens on the inode.
3107 * The backend will clear DELETING (a mod flag) and set DELETED
3108 * (a state flag) when it is actually able to perform the
3111 * Don't reflag the deletion if the flusher is currently syncing
3112 * one that was already flagged. A previously set DELETING flag
3113 * may bounce around flags and sync_flags until the operation is
3116 * Do not attempt to modify a snapshot inode (one set to read-only).
3118 if (ip->ino_data.nlinks == 0 &&
3119 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_RO|HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
3120 ip->flags |= HAMMER_INODE_DELETING;
3121 ip->flags |= HAMMER_INODE_TRUNCATED;
3125 if (hammer_get_vnode(ip, &vp) != 0)
3133 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0);
3140 * After potentially resolving a dependancy the inode is tested
3141 * to determine whether it needs to be reflushed.
3144 hammer_test_inode(hammer_inode_t ip)
3146 if (ip->flags & HAMMER_INODE_REFLUSH) {
3147 ip->flags &= ~HAMMER_INODE_REFLUSH;
3148 hammer_ref(&ip->lock);
3149 if (ip->flags & HAMMER_INODE_RESIGNAL) {
3150 ip->flags &= ~HAMMER_INODE_RESIGNAL;
3151 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
3153 hammer_flush_inode(ip, 0);
3155 hammer_rel_inode(ip, 0);
3160 * Clear the RECLAIM flag on an inode. This occurs when the inode is
3161 * reassociated with a vp or just before it gets freed.
3163 * Pipeline wakeups to threads blocked due to an excessive number of
3164 * detached inodes. This typically occurs when atime updates accumulate
3165 * while scanning a directory tree.
3168 hammer_inode_wakereclaims(hammer_inode_t ip)
3170 struct hammer_reclaim *reclaim;
3171 hammer_mount_t hmp = ip->hmp;
3173 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0)
3176 --hammer_count_reclaiming;
3177 --hmp->inode_reclaims;
3178 ip->flags &= ~HAMMER_INODE_RECLAIM;
3180 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) {
3181 KKASSERT(reclaim->count > 0);
3182 if (--reclaim->count == 0) {
3183 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry);
3190 * Setup our reclaim pipeline. We only let so many detached (and dirty)
3191 * inodes build up before we start blocking. This routine is called
3192 * if a new inode is created or an inode is loaded from media.
3194 * When we block we don't care *which* inode has finished reclaiming,
3195 * as lone as one does.
3197 * The reclaim pipeline is primary governed by the auto-flush which is
3198 * 1/4 hammer_limit_reclaim. We don't want to block if the count is
3199 * less than 1/2 hammer_limit_reclaim. From 1/2 to full count is
3200 * dynamically governed.
3203 hammer_inode_waitreclaims(hammer_transaction_t trans)
3205 hammer_mount_t hmp = trans->hmp;
3206 struct hammer_reclaim reclaim;
3210 * Track inode load, delay if the number of reclaiming inodes is
3211 * between 2/4 and 4/4 hammer_limit_reclaim, depending.
3213 if (curthread->td_proc) {
3214 struct hammer_inostats *stats;
3216 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid);
3219 if (stats->count > hammer_limit_reclaim / 2)
3220 stats->count = hammer_limit_reclaim / 2;
3221 lower_limit = hammer_limit_reclaim - stats->count;
3222 if (hammer_debug_general & 0x10000) {
3223 kprintf("pid %5d limit %d\n",
3224 (int)curthread->td_proc->p_pid, lower_limit);
3227 lower_limit = hammer_limit_reclaim * 3 / 4;
3229 if (hmp->inode_reclaims >= lower_limit) {
3231 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry);
3232 tsleep(&reclaim, 0, "hmrrcm", hz);
3233 if (reclaim.count > 0)
3234 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry);
3239 * Keep track of reclaim statistics on a per-pid basis using a loose
3240 * 4-way set associative hash table. Collisions inherit the count of
3241 * the previous entry.
3243 * NOTE: We want to be careful here to limit the chain size. If the chain
3244 * size is too large a pid will spread its stats out over too many
3245 * entries under certain types of heavy filesystem activity and
3246 * wind up not delaying long enough.
3249 struct hammer_inostats *
3250 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid)
3252 struct hammer_inostats *stats;
3255 static volatile int iterator; /* we don't care about MP races */
3258 * Chain up to 4 times to find our entry.
3260 for (chain = 0; chain < 4; ++chain) {
3261 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK];
3262 if (stats->pid == pid)
3267 * Replace one of the four chaining entries with our new entry.
3270 stats = &hmp->inostats[(pid + (iterator++ & 3)) &
3271 HAMMER_INOSTATS_HMASK];
3278 if (stats->count && stats->ltick != ticks) {
3279 delta = ticks - stats->ltick;
3280 stats->ltick = ticks;
3281 if (delta <= 0 || delta > hz * 60)
3284 stats->count = stats->count * hz / (hz + delta);
3286 if (hammer_debug_general & 0x10000)
3287 kprintf("pid %5d stats %d\n", (int)pid, stats->count);
3294 * XXX not used, doesn't work very well due to the large batching nature
3297 * A larger then normal backlog of inodes is sitting in the flusher,
3298 * enforce a general slowdown to let it catch up. This routine is only
3299 * called on completion of a non-flusher-related transaction which
3300 * performed B-Tree node I/O.
3302 * It is possible for the flusher to stall in a continuous load.
3303 * blogbench -i1000 -o seems to do a good job generating this sort of load.
3304 * If the flusher is unable to catch up the inode count can bloat until
3305 * we run out of kvm.
3307 * This is a bit of a hack.
3310 hammer_inode_waithard(hammer_mount_t hmp)
3315 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) {
3316 if (hmp->inode_reclaims < hammer_limit_reclaim / 2 &&
3317 hmp->count_iqueued < hmp->count_inodes / 20) {
3318 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY;
3322 if (hmp->inode_reclaims < hammer_limit_reclaim ||
3323 hmp->count_iqueued < hmp->count_inodes / 10) {
3326 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY;
3330 * Block for one flush cycle.
3332 hammer_flusher_wait_next(hmp);