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
36 #include <vm/vm_extern.h>
38 static int hammer_unload_inode(struct hammer_inode *ip);
39 static void hammer_free_inode(hammer_inode_t ip);
40 static void hammer_flush_inode_core(hammer_inode_t ip,
41 hammer_flush_group_t flg, int flags);
42 static int hammer_setup_child_callback(hammer_record_t rec, void *data);
44 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data);
46 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
47 hammer_flush_group_t flg);
48 static int hammer_setup_parent_inodes_helper(hammer_record_t record,
49 int depth, hammer_flush_group_t flg);
50 static void hammer_inode_wakereclaims(hammer_inode_t ip);
51 static struct hammer_inostats *hammer_inode_inostats(hammer_mount_t hmp,
55 extern struct hammer_inode *HammerTruncIp;
58 struct krate hammer_gen_krate = { 1 };
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_reclaims;
241 ++hmp->count_reclaims;
242 ip->flags |= HAMMER_INODE_RECLAIM;
244 hammer_unlock(&ip->lock);
246 hammer_rel_inode(ip, 1);
247 lwkt_reltoken(&hmp->fs_token);
253 * Inform the kernel that the inode is dirty. This will be checked
256 * Theoretically in order to reclaim a vnode the hammer_vop_reclaim()
257 * must be called which will interlock against our inode lock, so
258 * if VRECLAIMED is not set vp->v_mount (as used by vsetisdirty())
259 * should be stable without having to acquire any new locks.
262 hammer_inode_dirty(struct hammer_inode *ip)
266 if ((ip->flags & HAMMER_INODE_MODMASK) &&
267 (vp = ip->vp) != NULL &&
268 (vp->v_flag & (VRECLAIMED | VISDIRTY)) == 0) {
274 * Return a locked vnode for the specified inode. The inode must be
275 * referenced but NOT LOCKED on entry and will remain referenced on
278 * Called from the frontend.
281 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp)
291 if ((vp = ip->vp) == NULL) {
292 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0);
295 hammer_lock_ex(&ip->lock);
296 if (ip->vp != NULL) {
297 hammer_unlock(&ip->lock);
303 hammer_ref(&ip->lock);
307 obj_type = ip->ino_data.obj_type;
308 vp->v_type = hammer_get_vnode_type(obj_type);
310 hammer_inode_wakereclaims(ip);
312 switch(ip->ino_data.obj_type) {
313 case HAMMER_OBJTYPE_CDEV:
314 case HAMMER_OBJTYPE_BDEV:
315 vp->v_ops = &hmp->mp->mnt_vn_spec_ops;
316 addaliasu(vp, ip->ino_data.rmajor,
317 ip->ino_data.rminor);
319 case HAMMER_OBJTYPE_FIFO:
320 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops;
322 case HAMMER_OBJTYPE_REGFILE:
329 * Only mark as the root vnode if the ip is not
330 * historical, otherwise the VFS cache will get
331 * confused. The other half of the special handling
332 * is in hammer_vop_nlookupdotdot().
334 * Pseudo-filesystem roots can be accessed via
335 * non-root filesystem paths and setting VROOT may
336 * confuse the namecache. Set VPFSROOT instead.
338 if (ip->obj_id == HAMMER_OBJID_ROOT &&
339 ip->obj_asof == hmp->asof) {
340 if (ip->obj_localization == 0)
341 vsetflags(vp, VROOT);
343 vsetflags(vp, VPFSROOT);
346 vp->v_data = (void *)ip;
347 /* vnode locked by getnewvnode() */
348 /* make related vnode dirty if inode dirty? */
349 hammer_unlock(&ip->lock);
350 if (vp->v_type == VREG) {
351 vinitvmio(vp, ip->ino_data.size,
352 hammer_blocksize(ip->ino_data.size),
353 hammer_blockoff(ip->ino_data.size));
359 * Interlock vnode clearing. This does not prevent the
360 * vnode from going into a reclaimed state but it does
361 * prevent it from being destroyed or reused so the vget()
362 * will properly fail.
364 hammer_lock_ex(&ip->lock);
365 if ((vp = ip->vp) == NULL) {
366 hammer_unlock(&ip->lock);
370 hammer_unlock(&ip->lock);
373 * loop if the vget fails (aka races), or if the vp
374 * no longer matches ip->vp.
376 if (vget(vp, LK_EXCLUSIVE) == 0) {
390 * Locate all copies of the inode for obj_id compatible with the specified
391 * asof, reference, and issue the related call-back. This routine is used
392 * for direct-io invalidation and does not create any new inodes.
395 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo,
396 int (*callback)(hammer_inode_t ip, void *data),
399 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root,
400 hammer_inode_info_cmp_all_history,
405 * Acquire a HAMMER inode. The returned inode is not locked. These functions
406 * do not attach or detach the related vnode (use hammer_get_vnode() for
409 * The flags argument is only applied for newly created inodes, and only
410 * certain flags are inherited.
412 * Called from the frontend.
414 struct hammer_inode *
415 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip,
416 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
417 int flags, int *errorp)
419 hammer_mount_t hmp = trans->hmp;
420 struct hammer_node_cache *cachep;
421 struct hammer_inode_info iinfo;
422 struct hammer_cursor cursor;
423 struct hammer_inode *ip;
427 * Determine if we already have an inode cached. If we do then
430 * If we find an inode with no vnode we have to mark the
431 * transaction such that hammer_inode_waitreclaims() is
432 * called later on to avoid building up an infinite number
433 * of inodes. Otherwise we can continue to * add new inodes
434 * faster then they can be disposed of, even with the tsleep
437 * If we find a dummy inode we return a failure so dounlink
438 * (which does another lookup) doesn't try to mess with the
439 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode()
440 * to ref dummy inodes.
442 iinfo.obj_id = obj_id;
443 iinfo.obj_asof = asof;
444 iinfo.obj_localization = localization;
446 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
448 if (ip->flags & HAMMER_INODE_DUMMY) {
452 hammer_ref(&ip->lock);
458 * Allocate a new inode structure and deal with races later.
460 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
461 ++hammer_count_inodes;
464 ip->obj_asof = iinfo.obj_asof;
465 ip->obj_localization = localization;
467 ip->flags = flags & HAMMER_INODE_RO;
468 ip->cache[0].ip = ip;
469 ip->cache[1].ip = ip;
470 ip->cache[2].ip = ip;
471 ip->cache[3].ip = ip;
473 ip->flags |= HAMMER_INODE_RO;
474 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
475 0x7FFFFFFFFFFFFFFFLL;
476 RB_INIT(&ip->rec_tree);
477 TAILQ_INIT(&ip->target_list);
478 hammer_ref(&ip->lock);
481 * Locate the on-disk inode. If this is a PFS root we always
482 * access the current version of the root inode and (if it is not
483 * a master) always access information under it with a snapshot
486 * We cache recent inode lookups in this directory in dip->cache[2].
487 * If we can't find it we assume the inode we are looking for is
488 * close to the directory inode.
493 if (dip->cache[2].node)
494 cachep = &dip->cache[2];
496 cachep = &dip->cache[0];
498 hammer_init_cursor(trans, &cursor, cachep, NULL);
499 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE;
500 cursor.key_beg.obj_id = ip->obj_id;
501 cursor.key_beg.key = 0;
502 cursor.key_beg.create_tid = 0;
503 cursor.key_beg.delete_tid = 0;
504 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
505 cursor.key_beg.obj_type = 0;
507 cursor.asof = iinfo.obj_asof;
508 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA |
511 *errorp = hammer_btree_lookup(&cursor);
512 if (*errorp == EDEADLK) {
513 hammer_done_cursor(&cursor);
518 * On success the B-Tree lookup will hold the appropriate
519 * buffer cache buffers and provide a pointer to the requested
520 * information. Copy the information to the in-memory inode
521 * and cache the B-Tree node to improve future operations.
524 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
525 ip->ino_data = cursor.data->inode;
528 * cache[0] tries to cache the location of the object inode.
529 * The assumption is that it is near the directory inode.
531 * cache[1] tries to cache the location of the object data.
532 * We might have something in the governing directory from
533 * scan optimizations (see the strategy code in
536 * We update dip->cache[2], if possible, with the location
537 * of the object inode for future directory shortcuts.
539 hammer_cache_node(&ip->cache[0], cursor.node);
541 if (dip->cache[3].node) {
542 hammer_cache_node(&ip->cache[1],
545 hammer_cache_node(&dip->cache[2], cursor.node);
549 * The file should not contain any data past the file size
550 * stored in the inode. Setting save_trunc_off to the
551 * file size instead of max reduces B-Tree lookup overheads
552 * on append by allowing the flusher to avoid checking for
555 ip->save_trunc_off = ip->ino_data.size;
558 * Locate and assign the pseudofs management structure to
561 if (dip && dip->obj_localization == ip->obj_localization) {
562 ip->pfsm = dip->pfsm;
563 hammer_ref(&ip->pfsm->lock);
565 ip->pfsm = hammer_load_pseudofs(trans,
566 ip->obj_localization,
568 *errorp = 0; /* ignore ENOENT */
573 * The inode is placed on the red-black tree and will be synced to
574 * the media when flushed or by the filesystem sync. If this races
575 * another instantiation/lookup the insertion will fail.
578 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
579 hammer_free_inode(ip);
580 hammer_done_cursor(&cursor);
583 ip->flags |= HAMMER_INODE_ONDISK;
585 if (ip->flags & HAMMER_INODE_RSV_INODES) {
586 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
590 hammer_free_inode(ip);
593 hammer_done_cursor(&cursor);
596 * NEWINODE is only set if the inode becomes dirty later,
597 * setting it here just leads to unnecessary stalls.
599 * trans->flags |= HAMMER_TRANSF_NEWINODE;
605 * Get a dummy inode to placemark a broken directory entry.
607 struct hammer_inode *
608 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip,
609 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
610 int flags, int *errorp)
612 hammer_mount_t hmp = trans->hmp;
613 struct hammer_inode_info iinfo;
614 struct hammer_inode *ip;
617 * Determine if we already have an inode cached. If we do then
620 * If we find an inode with no vnode we have to mark the
621 * transaction such that hammer_inode_waitreclaims() is
622 * called later on to avoid building up an infinite number
623 * of inodes. Otherwise we can continue to * add new inodes
624 * faster then they can be disposed of, even with the tsleep
627 * If we find a non-fake inode we return an error. Only fake
628 * inodes can be returned by this routine.
630 iinfo.obj_id = obj_id;
631 iinfo.obj_asof = asof;
632 iinfo.obj_localization = localization;
635 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
637 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) {
641 hammer_ref(&ip->lock);
646 * Allocate a new inode structure and deal with races later.
648 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
649 ++hammer_count_inodes;
652 ip->obj_asof = iinfo.obj_asof;
653 ip->obj_localization = localization;
655 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY;
656 ip->cache[0].ip = ip;
657 ip->cache[1].ip = ip;
658 ip->cache[2].ip = ip;
659 ip->cache[3].ip = ip;
660 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
661 0x7FFFFFFFFFFFFFFFLL;
662 RB_INIT(&ip->rec_tree);
663 TAILQ_INIT(&ip->target_list);
664 hammer_ref(&ip->lock);
667 * Populate the dummy inode. Leave everything zero'd out.
669 * (ip->ino_leaf and ip->ino_data)
671 * Make the dummy inode a FIFO object which most copy programs
672 * will properly ignore.
674 ip->save_trunc_off = ip->ino_data.size;
675 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO;
678 * Locate and assign the pseudofs management structure to
681 if (dip && dip->obj_localization == ip->obj_localization) {
682 ip->pfsm = dip->pfsm;
683 hammer_ref(&ip->pfsm->lock);
685 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization,
687 *errorp = 0; /* ignore ENOENT */
691 * The inode is placed on the red-black tree and will be synced to
692 * the media when flushed or by the filesystem sync. If this races
693 * another instantiation/lookup the insertion will fail.
695 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake.
698 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
699 hammer_free_inode(ip);
703 if (ip->flags & HAMMER_INODE_RSV_INODES) {
704 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
707 hammer_free_inode(ip);
710 trans->flags |= HAMMER_TRANSF_NEWINODE;
715 * Return a referenced inode only if it is in our inode cache.
717 * Dummy inodes do not count.
719 struct hammer_inode *
720 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id,
721 hammer_tid_t asof, u_int32_t localization)
723 hammer_mount_t hmp = trans->hmp;
724 struct hammer_inode_info iinfo;
725 struct hammer_inode *ip;
727 iinfo.obj_id = obj_id;
728 iinfo.obj_asof = asof;
729 iinfo.obj_localization = localization;
731 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
733 if (ip->flags & HAMMER_INODE_DUMMY)
736 hammer_ref(&ip->lock);
742 * Create a new filesystem object, returning the inode in *ipp. The
743 * returned inode will be referenced. The inode is created in-memory.
745 * If pfsm is non-NULL the caller wishes to create the root inode for
749 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
751 hammer_inode_t dip, const char *name, int namelen,
752 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp)
764 * Disallow the creation of new inodes in directories which
765 * have been deleted. In HAMMER, this will cause a record
766 * syncing assertion later on in the flush code.
768 if (dip && dip->ino_data.nlinks == 0) {
776 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
777 ++hammer_count_inodes;
779 trans->flags |= HAMMER_TRANSF_NEWINODE;
782 KKASSERT(pfsm->localization != 0);
783 ip->obj_id = HAMMER_OBJID_ROOT;
784 ip->obj_localization = pfsm->localization;
786 KKASSERT(dip != NULL);
787 namekey = hammer_directory_namekey(dip, name, namelen, &dummy);
788 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey);
789 ip->obj_localization = dip->obj_localization;
792 KKASSERT(ip->obj_id != 0);
793 ip->obj_asof = hmp->asof;
795 ip->flush_state = HAMMER_FST_IDLE;
796 ip->flags = HAMMER_INODE_DDIRTY |
797 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME;
798 ip->cache[0].ip = ip;
799 ip->cache[1].ip = ip;
800 ip->cache[2].ip = ip;
801 ip->cache[3].ip = ip;
803 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
804 /* ip->save_trunc_off = 0; (already zero) */
805 RB_INIT(&ip->rec_tree);
806 TAILQ_INIT(&ip->target_list);
808 ip->ino_data.atime = trans->time;
809 ip->ino_data.mtime = trans->time;
810 ip->ino_data.size = 0;
811 ip->ino_data.nlinks = 0;
814 * A nohistory designator on the parent directory is inherited by
815 * the child. We will do this even for pseudo-fs creation... the
816 * sysad can turn it off.
819 ip->ino_data.uflags = dip->ino_data.uflags &
820 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
823 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
824 ip->ino_leaf.base.localization = ip->obj_localization +
825 HAMMER_LOCALIZE_INODE;
826 ip->ino_leaf.base.obj_id = ip->obj_id;
827 ip->ino_leaf.base.key = 0;
828 ip->ino_leaf.base.create_tid = 0;
829 ip->ino_leaf.base.delete_tid = 0;
830 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
831 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
833 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
834 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
835 ip->ino_data.mode = vap->va_mode;
836 ip->ino_data.ctime = trans->time;
839 * If we are running version 2 or greater directory entries are
840 * inode-localized instead of data-localized.
842 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) {
843 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
844 ip->ino_data.cap_flags |=
845 HAMMER_INODE_CAP_DIR_LOCAL_INO;
848 if (trans->hmp->version >= HAMMER_VOL_VERSION_SIX) {
849 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
850 ip->ino_data.cap_flags |=
851 HAMMER_INODE_CAP_DIRHASH_ALG1;
856 * Setup the ".." pointer. This only needs to be done for directories
857 * but we do it for all objects as a recovery aid.
860 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id;
863 * The parent_obj_localization field only applies to pseudo-fs roots.
864 * XXX this is no longer applicable, PFSs are no longer directly
865 * tied into the parent's directory structure.
867 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY &&
868 ip->obj_id == HAMMER_OBJID_ROOT) {
869 ip->ino_data.ext.obj.parent_obj_localization =
870 dip->obj_localization;
874 switch(ip->ino_leaf.base.obj_type) {
875 case HAMMER_OBJTYPE_CDEV:
876 case HAMMER_OBJTYPE_BDEV:
877 ip->ino_data.rmajor = vap->va_rmajor;
878 ip->ino_data.rminor = vap->va_rminor;
885 * Calculate default uid/gid and overwrite with information from
889 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
890 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode,
891 xuid, cred, &vap->va_mode);
895 ip->ino_data.mode = vap->va_mode;
897 if (vap->va_vaflags & VA_UID_UUID_VALID)
898 ip->ino_data.uid = vap->va_uid_uuid;
899 else if (vap->va_uid != (uid_t)VNOVAL)
900 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
902 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
904 if (vap->va_vaflags & VA_GID_UUID_VALID)
905 ip->ino_data.gid = vap->va_gid_uuid;
906 else if (vap->va_gid != (gid_t)VNOVAL)
907 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
909 ip->ino_data.gid = dip->ino_data.gid;
911 hammer_ref(&ip->lock);
915 hammer_ref(&pfsm->lock);
917 } else if (dip->obj_localization == ip->obj_localization) {
918 ip->pfsm = dip->pfsm;
919 hammer_ref(&ip->pfsm->lock);
922 ip->pfsm = hammer_load_pseudofs(trans,
923 ip->obj_localization,
925 error = 0; /* ignore ENOENT */
929 hammer_free_inode(ip);
931 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
932 panic("hammer_create_inode: duplicate obj_id %llx",
933 (long long)ip->obj_id);
935 hammer_free_inode(ip);
942 * Final cleanup / freeing of an inode structure
945 hammer_free_inode(hammer_inode_t ip)
947 struct hammer_mount *hmp;
950 KKASSERT(hammer_oneref(&ip->lock));
951 hammer_uncache_node(&ip->cache[0]);
952 hammer_uncache_node(&ip->cache[1]);
953 hammer_uncache_node(&ip->cache[2]);
954 hammer_uncache_node(&ip->cache[3]);
955 hammer_inode_wakereclaims(ip);
957 hammer_clear_objid(ip);
958 --hammer_count_inodes;
961 hammer_rel_pseudofs(hmp, ip->pfsm);
964 kfree(ip, hmp->m_inodes);
969 * Retrieve pseudo-fs data. NULL will never be returned.
971 * If an error occurs *errorp will be set and a default template is returned,
972 * otherwise *errorp is set to 0. Typically when an error occurs it will
975 hammer_pseudofs_inmem_t
976 hammer_load_pseudofs(hammer_transaction_t trans,
977 u_int32_t localization, int *errorp)
979 hammer_mount_t hmp = trans->hmp;
981 hammer_pseudofs_inmem_t pfsm;
982 struct hammer_cursor cursor;
986 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization);
988 hammer_ref(&pfsm->lock);
994 * PFS records are stored in the root inode (not the PFS root inode,
995 * but the real root). Avoid an infinite recursion if loading
996 * the PFS for the real root.
999 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT,
1001 HAMMER_DEF_LOCALIZATION, 0, errorp);
1006 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO);
1007 pfsm->localization = localization;
1008 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid;
1009 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid;
1011 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip);
1012 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION +
1013 HAMMER_LOCALIZE_MISC;
1014 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
1015 cursor.key_beg.create_tid = 0;
1016 cursor.key_beg.delete_tid = 0;
1017 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
1018 cursor.key_beg.obj_type = 0;
1019 cursor.key_beg.key = localization;
1020 cursor.asof = HAMMER_MAX_TID;
1021 cursor.flags |= HAMMER_CURSOR_ASOF;
1024 *errorp = hammer_ip_lookup(&cursor);
1026 *errorp = hammer_btree_lookup(&cursor);
1028 *errorp = hammer_ip_resolve_data(&cursor);
1030 if (cursor.data->pfsd.mirror_flags &
1031 HAMMER_PFSD_DELETED) {
1034 bytes = cursor.leaf->data_len;
1035 if (bytes > sizeof(pfsm->pfsd))
1036 bytes = sizeof(pfsm->pfsd);
1037 bcopy(cursor.data, &pfsm->pfsd, bytes);
1041 hammer_done_cursor(&cursor);
1043 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1044 hammer_ref(&pfsm->lock);
1046 hammer_rel_inode(ip, 0);
1047 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) {
1048 kfree(pfsm, hmp->m_misc);
1055 * Store pseudo-fs data. The backend will automatically delete any prior
1056 * on-disk pseudo-fs data but we have to delete in-memory versions.
1059 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm)
1061 struct hammer_cursor cursor;
1062 hammer_record_t record;
1066 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1067 HAMMER_DEF_LOCALIZATION, 0, &error);
1069 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1070 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
1071 cursor.key_beg.localization = ip->obj_localization +
1072 HAMMER_LOCALIZE_MISC;
1073 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
1074 cursor.key_beg.create_tid = 0;
1075 cursor.key_beg.delete_tid = 0;
1076 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
1077 cursor.key_beg.obj_type = 0;
1078 cursor.key_beg.key = pfsm->localization;
1079 cursor.asof = HAMMER_MAX_TID;
1080 cursor.flags |= HAMMER_CURSOR_ASOF;
1083 * Replace any in-memory version of the record.
1085 error = hammer_ip_lookup(&cursor);
1086 if (error == 0 && hammer_cursor_inmem(&cursor)) {
1087 record = cursor.iprec;
1088 if (record->flags & HAMMER_RECF_INTERLOCK_BE) {
1089 KKASSERT(cursor.deadlk_rec == NULL);
1090 hammer_ref(&record->lock);
1091 cursor.deadlk_rec = record;
1094 record->flags |= HAMMER_RECF_DELETED_FE;
1100 * Allocate replacement general record. The backend flush will
1101 * delete any on-disk version of the record.
1103 if (error == 0 || error == ENOENT) {
1104 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd));
1105 record->type = HAMMER_MEM_RECORD_GENERAL;
1107 record->leaf.base.localization = ip->obj_localization +
1108 HAMMER_LOCALIZE_MISC;
1109 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS;
1110 record->leaf.base.key = pfsm->localization;
1111 record->leaf.data_len = sizeof(pfsm->pfsd);
1112 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd));
1113 error = hammer_ip_add_record(trans, record);
1115 hammer_done_cursor(&cursor);
1116 if (error == EDEADLK)
1118 hammer_rel_inode(ip, 0);
1123 * Create a root directory for a PFS if one does not alredy exist.
1125 * The PFS root stands alone so we must also bump the nlinks count
1126 * to prevent it from being destroyed on release.
1129 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred,
1130 hammer_pseudofs_inmem_t pfsm)
1136 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1137 pfsm->localization, 0, &error);
1142 error = hammer_create_inode(trans, &vap, cred,
1146 ++ip->ino_data.nlinks;
1147 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY);
1151 hammer_rel_inode(ip, 0);
1156 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY
1157 * if we are unable to disassociate all the inodes.
1161 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data)
1165 hammer_ref(&ip->lock);
1166 if (hammer_isactive(&ip->lock) == 2 && ip->vp)
1167 vclean_unlocked(ip->vp);
1168 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL)
1171 res = -1; /* stop, someone is using the inode */
1172 hammer_rel_inode(ip, 0);
1177 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization)
1182 for (try = res = 0; try < 4; ++try) {
1183 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root,
1184 hammer_inode_pfs_cmp,
1185 hammer_unload_pseudofs_callback,
1187 if (res == 0 && try > 1)
1189 hammer_flusher_sync(trans->hmp);
1198 * Release a reference on a PFS
1201 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm)
1203 hammer_rel(&pfsm->lock);
1204 if (hammer_norefs(&pfsm->lock)) {
1205 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm);
1206 kfree(pfsm, hmp->m_misc);
1211 * Called by hammer_sync_inode().
1214 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
1216 hammer_transaction_t trans = cursor->trans;
1217 hammer_record_t record;
1225 * If the inode has a presence on-disk then locate it and mark
1226 * it deleted, setting DELONDISK.
1228 * The record may or may not be physically deleted, depending on
1229 * the retention policy.
1231 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
1232 HAMMER_INODE_ONDISK) {
1233 hammer_normalize_cursor(cursor);
1234 cursor->key_beg.localization = ip->obj_localization +
1235 HAMMER_LOCALIZE_INODE;
1236 cursor->key_beg.obj_id = ip->obj_id;
1237 cursor->key_beg.key = 0;
1238 cursor->key_beg.create_tid = 0;
1239 cursor->key_beg.delete_tid = 0;
1240 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1241 cursor->key_beg.obj_type = 0;
1242 cursor->asof = ip->obj_asof;
1243 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1244 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
1245 cursor->flags |= HAMMER_CURSOR_BACKEND;
1247 error = hammer_btree_lookup(cursor);
1248 if (hammer_debug_inode)
1249 kprintf("IPDEL %p %08x %d", ip, ip->flags, error);
1252 error = hammer_ip_delete_record(cursor, ip, trans->tid);
1253 if (hammer_debug_inode)
1254 kprintf(" error %d\n", error);
1256 ip->flags |= HAMMER_INODE_DELONDISK;
1259 hammer_cache_node(&ip->cache[0], cursor->node);
1261 if (error == EDEADLK) {
1262 hammer_done_cursor(cursor);
1263 error = hammer_init_cursor(trans, cursor,
1265 if (hammer_debug_inode)
1266 kprintf("IPDED %p %d\n", ip, error);
1273 * Ok, write out the initial record or a new record (after deleting
1274 * the old one), unless the DELETED flag is set. This routine will
1275 * clear DELONDISK if it writes out a record.
1277 * Update our inode statistics if this is the first application of
1278 * the inode on-disk.
1280 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
1282 * Generate a record and write it to the media. We clean-up
1283 * the state before releasing so we do not have to set-up
1286 record = hammer_alloc_mem_record(ip, 0);
1287 record->type = HAMMER_MEM_RECORD_INODE;
1288 record->flush_state = HAMMER_FST_FLUSH;
1289 record->leaf = ip->sync_ino_leaf;
1290 record->leaf.base.create_tid = trans->tid;
1291 record->leaf.data_len = sizeof(ip->sync_ino_data);
1292 record->leaf.create_ts = trans->time32;
1293 record->data = (void *)&ip->sync_ino_data;
1294 record->flags |= HAMMER_RECF_INTERLOCK_BE;
1297 * If this flag is set we cannot sync the new file size
1298 * because we haven't finished related truncations. The
1299 * inode will be flushed in another flush group to finish
1302 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) &&
1303 ip->sync_ino_data.size != ip->ino_data.size) {
1305 ip->sync_ino_data.size = ip->ino_data.size;
1311 error = hammer_ip_sync_record_cursor(cursor, record);
1312 if (hammer_debug_inode)
1313 kprintf("GENREC %p rec %08x %d\n",
1314 ip, record->flags, error);
1315 if (error != EDEADLK)
1317 hammer_done_cursor(cursor);
1318 error = hammer_init_cursor(trans, cursor,
1320 if (hammer_debug_inode)
1321 kprintf("GENREC reinit %d\n", error);
1327 * Note: The record was never on the inode's record tree
1328 * so just wave our hands importantly and destroy it.
1330 record->flags |= HAMMER_RECF_COMMITTED;
1331 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
1332 record->flush_state = HAMMER_FST_IDLE;
1333 ++ip->rec_generation;
1334 hammer_rel_mem_record(record);
1340 if (hammer_debug_inode)
1341 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
1342 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1343 HAMMER_INODE_SDIRTY |
1344 HAMMER_INODE_ATIME |
1345 HAMMER_INODE_MTIME);
1346 ip->flags &= ~HAMMER_INODE_DELONDISK;
1348 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1351 * Root volume count of inodes
1353 hammer_sync_lock_sh(trans);
1354 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
1355 hammer_modify_volume_field(trans,
1358 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
1359 hammer_modify_volume_done(trans->rootvol);
1360 ip->flags |= HAMMER_INODE_ONDISK;
1361 if (hammer_debug_inode)
1362 kprintf("NOWONDISK %p\n", ip);
1364 hammer_sync_unlock(trans);
1369 * If the inode has been destroyed, clean out any left-over flags
1370 * that may have been set by the frontend.
1372 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
1373 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1374 HAMMER_INODE_SDIRTY |
1375 HAMMER_INODE_ATIME |
1376 HAMMER_INODE_MTIME);
1382 * Update only the itimes fields.
1384 * ATIME can be updated without generating any UNDO. MTIME is updated
1385 * with UNDO so it is guaranteed to be synchronized properly in case of
1388 * Neither field is included in the B-Tree leaf element's CRC, which is how
1389 * we can get away with updating ATIME the way we do.
1392 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
1394 hammer_transaction_t trans = cursor->trans;
1398 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) !=
1399 HAMMER_INODE_ONDISK) {
1403 hammer_normalize_cursor(cursor);
1404 cursor->key_beg.localization = ip->obj_localization +
1405 HAMMER_LOCALIZE_INODE;
1406 cursor->key_beg.obj_id = ip->obj_id;
1407 cursor->key_beg.key = 0;
1408 cursor->key_beg.create_tid = 0;
1409 cursor->key_beg.delete_tid = 0;
1410 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1411 cursor->key_beg.obj_type = 0;
1412 cursor->asof = ip->obj_asof;
1413 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1414 cursor->flags |= HAMMER_CURSOR_ASOF;
1415 cursor->flags |= HAMMER_CURSOR_GET_LEAF;
1416 cursor->flags |= HAMMER_CURSOR_GET_DATA;
1417 cursor->flags |= HAMMER_CURSOR_BACKEND;
1419 error = hammer_btree_lookup(cursor);
1421 hammer_cache_node(&ip->cache[0], cursor->node);
1422 if (ip->sync_flags & HAMMER_INODE_MTIME) {
1424 * Updating MTIME requires an UNDO. Just cover
1425 * both atime and mtime.
1427 hammer_sync_lock_sh(trans);
1428 hammer_modify_buffer(trans, cursor->data_buffer,
1429 HAMMER_ITIMES_BASE(&cursor->data->inode),
1430 HAMMER_ITIMES_BYTES);
1431 cursor->data->inode.atime = ip->sync_ino_data.atime;
1432 cursor->data->inode.mtime = ip->sync_ino_data.mtime;
1433 hammer_modify_buffer_done(cursor->data_buffer);
1434 hammer_sync_unlock(trans);
1435 } else if (ip->sync_flags & HAMMER_INODE_ATIME) {
1437 * Updating atime only can be done in-place with
1440 hammer_sync_lock_sh(trans);
1441 hammer_modify_buffer(trans, cursor->data_buffer,
1443 cursor->data->inode.atime = ip->sync_ino_data.atime;
1444 hammer_modify_buffer_done(cursor->data_buffer);
1445 hammer_sync_unlock(trans);
1447 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME);
1449 if (error == EDEADLK) {
1450 hammer_done_cursor(cursor);
1451 error = hammer_init_cursor(trans, cursor,
1460 * Release a reference on an inode, flush as requested.
1462 * On the last reference we queue the inode to the flusher for its final
1466 hammer_rel_inode(struct hammer_inode *ip, int flush)
1468 /*hammer_mount_t hmp = ip->hmp;*/
1471 * Handle disposition when dropping the last ref.
1474 if (hammer_oneref(&ip->lock)) {
1476 * Determine whether on-disk action is needed for
1477 * the inode's final disposition.
1479 KKASSERT(ip->vp == NULL);
1480 hammer_inode_unloadable_check(ip, 0);
1481 if (ip->flags & HAMMER_INODE_MODMASK) {
1482 hammer_flush_inode(ip, 0);
1483 } else if (hammer_oneref(&ip->lock)) {
1484 hammer_unload_inode(ip);
1489 hammer_flush_inode(ip, 0);
1492 * The inode still has multiple refs, try to drop
1495 KKASSERT(hammer_isactive(&ip->lock) >= 1);
1496 if (hammer_isactive(&ip->lock) > 1) {
1497 hammer_rel(&ip->lock);
1505 * Unload and destroy the specified inode. Must be called with one remaining
1506 * reference. The reference is disposed of.
1508 * The inode must be completely clean.
1511 hammer_unload_inode(struct hammer_inode *ip)
1513 hammer_mount_t hmp = ip->hmp;
1515 KASSERT(hammer_oneref(&ip->lock),
1516 ("hammer_unload_inode: %d refs", hammer_isactive(&ip->lock)));
1517 KKASSERT(ip->vp == NULL);
1518 KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
1519 KKASSERT(ip->cursor_ip_refs == 0);
1520 KKASSERT(hammer_notlocked(&ip->lock));
1521 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
1523 KKASSERT(RB_EMPTY(&ip->rec_tree));
1524 KKASSERT(TAILQ_EMPTY(&ip->target_list));
1526 if (ip->flags & HAMMER_INODE_RDIRTY) {
1527 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip);
1528 ip->flags &= ~HAMMER_INODE_RDIRTY;
1530 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
1532 hammer_free_inode(ip);
1537 * Called during unmounting if a critical error occured. The in-memory
1538 * inode and all related structures are destroyed.
1540 * If a critical error did not occur the unmount code calls the standard
1541 * release and asserts that the inode is gone.
1544 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused)
1546 hammer_record_t rec;
1549 * Get rid of the inodes in-memory records, regardless of their
1550 * state, and clear the mod-mask.
1552 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) {
1553 TAILQ_REMOVE(&ip->target_list, rec, target_entry);
1554 rec->target_ip = NULL;
1555 if (rec->flush_state == HAMMER_FST_SETUP)
1556 rec->flush_state = HAMMER_FST_IDLE;
1558 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) {
1559 if (rec->flush_state == HAMMER_FST_FLUSH)
1560 --rec->flush_group->refs;
1562 hammer_ref(&rec->lock);
1563 KKASSERT(hammer_oneref(&rec->lock));
1564 rec->flush_state = HAMMER_FST_IDLE;
1565 rec->flush_group = NULL;
1566 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */
1567 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */
1568 ++ip->rec_generation;
1569 hammer_rel_mem_record(rec);
1571 ip->flags &= ~HAMMER_INODE_MODMASK;
1572 ip->sync_flags &= ~HAMMER_INODE_MODMASK;
1573 KKASSERT(ip->vp == NULL);
1576 * Remove the inode from any flush group, force it idle. FLUSH
1577 * and SETUP states have an inode ref.
1579 switch(ip->flush_state) {
1580 case HAMMER_FST_FLUSH:
1581 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
1582 --ip->flush_group->refs;
1583 ip->flush_group = NULL;
1585 case HAMMER_FST_SETUP:
1586 hammer_rel(&ip->lock);
1587 ip->flush_state = HAMMER_FST_IDLE;
1589 case HAMMER_FST_IDLE:
1594 * There shouldn't be any associated vnode. The unload needs at
1595 * least one ref, if we do have a vp steal its ip ref.
1598 kprintf("hammer_destroy_inode_callback: Unexpected "
1599 "vnode association ip %p vp %p\n", ip, ip->vp);
1600 ip->vp->v_data = NULL;
1603 hammer_ref(&ip->lock);
1605 hammer_unload_inode(ip);
1610 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1611 * the read-only flag for cached inodes.
1613 * This routine is called from a RB_SCAN().
1616 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
1618 hammer_mount_t hmp = ip->hmp;
1620 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
1621 ip->flags |= HAMMER_INODE_RO;
1623 ip->flags &= ~HAMMER_INODE_RO;
1628 * A transaction has modified an inode, requiring updates as specified by
1631 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime,
1632 * and not including size changes due to write-append
1633 * (but other size changes are included).
1634 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to
1636 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1637 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1638 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1639 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1642 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags)
1645 * ronly of 0 or 2 does not trigger assertion.
1646 * 2 is a special error state
1648 KKASSERT(ip->hmp->ronly != 1 ||
1649 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
1650 HAMMER_INODE_SDIRTY |
1651 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED |
1652 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0);
1653 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
1654 ip->flags |= HAMMER_INODE_RSV_INODES;
1655 ++ip->hmp->rsv_inodes;
1659 * Set the NEWINODE flag in the transaction if the inode
1660 * transitions to a dirty state. This is used to track
1661 * the load on the inode cache.
1664 (ip->flags & HAMMER_INODE_MODMASK) == 0 &&
1665 (flags & HAMMER_INODE_MODMASK)) {
1666 trans->flags |= HAMMER_TRANSF_NEWINODE;
1668 if (flags & HAMMER_INODE_MODMASK)
1669 hammer_inode_dirty(ip);
1674 * Attempt to quickly update the atime for a hammer inode. Return 0 on
1675 * success, -1 on failure.
1677 * We attempt to update the atime with only the ip lock and not the
1678 * whole filesystem lock in order to improve concurrency. We can only
1679 * do this safely if the ATIME flag is already pending on the inode.
1681 * This function is called via a vnops path (ip pointer is stable) without
1685 hammer_update_atime_quick(hammer_inode_t ip)
1690 if ((ip->flags & HAMMER_INODE_RO) ||
1691 (ip->hmp->mp->mnt_flag & MNT_NOATIME)) {
1693 * Silently indicate success on read-only mount/snap
1696 } else if (ip->flags & HAMMER_INODE_ATIME) {
1698 * Double check with inode lock held against backend. This
1699 * is only safe if all we need to do is update
1703 hammer_lock_ex(&ip->lock);
1704 if (ip->flags & HAMMER_INODE_ATIME) {
1705 ip->ino_data.atime =
1706 (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
1709 hammer_unlock(&ip->lock);
1715 * Request that an inode be flushed. This whole mess cannot block and may
1716 * recurse (if not synchronous). Once requested HAMMER will attempt to
1717 * actively flush the inode until the flush can be done.
1719 * The inode may already be flushing, or may be in a setup state. We can
1720 * place the inode in a flushing state if it is currently idle and flag it
1721 * to reflush if it is currently flushing.
1723 * Upon return if the inode could not be flushed due to a setup
1724 * dependancy, then it will be automatically flushed when the dependancy
1728 hammer_flush_inode(hammer_inode_t ip, int flags)
1731 hammer_flush_group_t flg;
1735 * fill_flush_group is the first flush group we may be able to
1736 * continue filling, it may be open or closed but it will always
1737 * be past the currently flushing (running) flg.
1739 * next_flush_group is the next open flush group.
1742 while ((flg = hmp->fill_flush_group) != NULL) {
1743 KKASSERT(flg->running == 0);
1744 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit &&
1745 flg->total_count <= hammer_autoflush) {
1748 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
1749 hammer_flusher_async(ip->hmp, flg);
1752 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO);
1753 flg->seq = hmp->flusher.next++;
1754 if (hmp->next_flush_group == NULL)
1755 hmp->next_flush_group = flg;
1756 if (hmp->fill_flush_group == NULL)
1757 hmp->fill_flush_group = flg;
1758 RB_INIT(&flg->flush_tree);
1759 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry);
1763 * Trivial 'nothing to flush' case. If the inode is in a SETUP
1764 * state we have to put it back into an IDLE state so we can
1765 * drop the extra ref.
1767 * If we have a parent dependancy we must still fall through
1770 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
1771 if (ip->flush_state == HAMMER_FST_SETUP &&
1772 TAILQ_EMPTY(&ip->target_list)) {
1773 ip->flush_state = HAMMER_FST_IDLE;
1774 hammer_rel_inode(ip, 0);
1776 if (ip->flush_state == HAMMER_FST_IDLE)
1781 * Our flush action will depend on the current state.
1783 switch(ip->flush_state) {
1784 case HAMMER_FST_IDLE:
1786 * We have no dependancies and can flush immediately. Some
1787 * our children may not be flushable so we have to re-test
1788 * with that additional knowledge.
1790 hammer_flush_inode_core(ip, flg, flags);
1792 case HAMMER_FST_SETUP:
1794 * Recurse upwards through dependancies via target_list
1795 * and start their flusher actions going if possible.
1797 * 'good' is our connectivity. -1 means we have none and
1798 * can't flush, 0 means there weren't any dependancies, and
1799 * 1 means we have good connectivity.
1801 good = hammer_setup_parent_inodes(ip, 0, flg);
1805 * We can continue if good >= 0. Determine how
1806 * many records under our inode can be flushed (and
1809 hammer_flush_inode_core(ip, flg, flags);
1812 * Parent has no connectivity, tell it to flush
1813 * us as soon as it does.
1815 * The REFLUSH flag is also needed to trigger
1816 * dependancy wakeups.
1818 ip->flags |= HAMMER_INODE_CONN_DOWN |
1819 HAMMER_INODE_REFLUSH;
1820 if (flags & HAMMER_FLUSH_SIGNAL) {
1821 ip->flags |= HAMMER_INODE_RESIGNAL;
1822 hammer_flusher_async(ip->hmp, flg);
1826 case HAMMER_FST_FLUSH:
1828 * We are already flushing, flag the inode to reflush
1829 * if needed after it completes its current flush.
1831 * The REFLUSH flag is also needed to trigger
1832 * dependancy wakeups.
1834 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
1835 ip->flags |= HAMMER_INODE_REFLUSH;
1836 if (flags & HAMMER_FLUSH_SIGNAL) {
1837 ip->flags |= HAMMER_INODE_RESIGNAL;
1838 hammer_flusher_async(ip->hmp, flg);
1845 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1846 * ip which reference our ip.
1848 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1849 * so for now do not ref/deref the structures. Note that if we use the
1850 * ref/rel code later, the rel CAN block.
1853 hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
1854 hammer_flush_group_t flg)
1856 hammer_record_t depend;
1861 * If we hit our recursion limit and we have parent dependencies
1862 * We cannot continue. Returning < 0 will cause us to be flagged
1863 * for reflush. Returning -2 cuts off additional dependency checks
1864 * because they are likely to also hit the depth limit.
1866 * We cannot return < 0 if there are no dependencies or there might
1867 * not be anything to wakeup (ip).
1869 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) {
1870 if (hammer_debug_general & 0x10000)
1871 krateprintf(&hammer_gen_krate,
1872 "HAMMER Warning: depth limit reached on "
1873 "setup recursion, inode %p %016llx\n",
1874 ip, (long long)ip->obj_id);
1882 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
1883 r = hammer_setup_parent_inodes_helper(depend, depth, flg);
1884 KKASSERT(depend->target_ip == ip);
1885 if (r < 0 && good == 0)
1891 * If we failed due to the recursion depth limit then stop
1901 * This helper function takes a record representing the dependancy between
1902 * the parent inode and child inode.
1904 * record->ip = parent inode
1905 * record->target_ip = child inode
1907 * We are asked to recurse upwards and convert the record from SETUP
1908 * to FLUSH if possible.
1910 * Return 1 if the record gives us connectivity
1912 * Return 0 if the record is not relevant
1914 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1917 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth,
1918 hammer_flush_group_t flg)
1923 KKASSERT(record->flush_state != HAMMER_FST_IDLE);
1927 * If the record is already flushing, is it in our flush group?
1929 * If it is in our flush group but it is a general record or a
1930 * delete-on-disk, it does not improve our connectivity (return 0),
1931 * and if the target inode is not trying to destroy itself we can't
1932 * allow the operation yet anyway (the second return -1).
1934 if (record->flush_state == HAMMER_FST_FLUSH) {
1936 * If not in our flush group ask the parent to reflush
1937 * us as soon as possible.
1939 if (record->flush_group != flg) {
1940 pip->flags |= HAMMER_INODE_REFLUSH;
1941 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1946 * If in our flush group everything is already set up,
1947 * just return whether the record will improve our
1948 * visibility or not.
1950 if (record->type == HAMMER_MEM_RECORD_ADD)
1956 * It must be a setup record. Try to resolve the setup dependancies
1957 * by recursing upwards so we can place ip on the flush list.
1959 * Limit ourselves to 20 levels of recursion to avoid blowing out
1960 * the kernel stack. If we hit the recursion limit we can't flush
1961 * until the parent flushes. The parent will flush independantly
1962 * on its own and ultimately a deep recursion will be resolved.
1964 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1966 good = hammer_setup_parent_inodes(pip, depth + 1, flg);
1969 * If good < 0 the parent has no connectivity and we cannot safely
1970 * flush the directory entry, which also means we can't flush our
1971 * ip. Flag us for downward recursion once the parent's
1972 * connectivity is resolved. Flag the parent for [re]flush or it
1973 * may not check for downward recursions.
1976 pip->flags |= HAMMER_INODE_REFLUSH;
1977 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1982 * We are go, place the parent inode in a flushing state so we can
1983 * place its record in a flushing state. Note that the parent
1984 * may already be flushing. The record must be in the same flush
1985 * group as the parent.
1987 if (pip->flush_state != HAMMER_FST_FLUSH)
1988 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION);
1989 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH);
1992 * It is possible for a rename to create a loop in the recursion
1993 * and revisit a record. This will result in the record being
1994 * placed in a flush state unexpectedly. This check deals with
1997 if (record->flush_state == HAMMER_FST_FLUSH) {
1998 if (record->type == HAMMER_MEM_RECORD_ADD)
2003 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
2006 if (record->type == HAMMER_MEM_RECORD_DEL &&
2007 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
2009 * Regardless of flushing state we cannot sync this path if the
2010 * record represents a delete-on-disk but the target inode
2011 * is not ready to sync its own deletion.
2013 * XXX need to count effective nlinks to determine whether
2014 * the flush is ok, otherwise removing a hardlink will
2015 * just leave the DEL record to rot.
2017 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
2021 if (pip->flush_group == flg) {
2023 * Because we have not calculated nlinks yet we can just
2024 * set records to the flush state if the parent is in
2025 * the same flush group as we are.
2027 record->flush_state = HAMMER_FST_FLUSH;
2028 record->flush_group = flg;
2029 ++record->flush_group->refs;
2030 hammer_ref(&record->lock);
2033 * A general directory-add contributes to our visibility.
2035 * Otherwise it is probably a directory-delete or
2036 * delete-on-disk record and does not contribute to our
2037 * visbility (but we can still flush it).
2039 if (record->type == HAMMER_MEM_RECORD_ADD)
2044 * If the parent is not in our flush group we cannot
2045 * flush this record yet, there is no visibility.
2046 * We tell the parent to reflush and mark ourselves
2047 * so the parent knows it should flush us too.
2049 pip->flags |= HAMMER_INODE_REFLUSH;
2050 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
2056 * This is the core routine placing an inode into the FST_FLUSH state.
2059 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags)
2061 hammer_mount_t hmp = ip->hmp;
2065 * Set flush state and prevent the flusher from cycling into
2066 * the next flush group. Do not place the ip on the list yet.
2067 * Inodes not in the idle state get an extra reference.
2069 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
2070 if (ip->flush_state == HAMMER_FST_IDLE)
2071 hammer_ref(&ip->lock);
2072 ip->flush_state = HAMMER_FST_FLUSH;
2073 ip->flush_group = flg;
2074 ++hmp->flusher.group_lock;
2075 ++hmp->count_iqueued;
2076 ++hammer_count_iqueued;
2078 hammer_redo_fifo_start_flush(ip);
2082 * We need to be able to vfsync/truncate from the backend.
2084 * XXX Any truncation from the backend will acquire the vnode
2087 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
2088 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
2089 ip->flags |= HAMMER_INODE_VHELD;
2095 * Figure out how many in-memory records we can actually flush
2096 * (not including inode meta-data, buffers, etc).
2098 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0);
2099 if (flags & HAMMER_FLUSH_RECURSION) {
2101 * If this is a upwards recursion we do not want to
2102 * recurse down again!
2106 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2108 * No new records are added if we must complete a flush
2109 * from a previous cycle, but we do have to move the records
2110 * from the previous cycle to the current one.
2113 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2114 hammer_syncgrp_child_callback, NULL);
2120 * Normal flush, scan records and bring them into the flush.
2121 * Directory adds and deletes are usually skipped (they are
2122 * grouped with the related inode rather then with the
2125 * go_count can be negative, which means the scan aborted
2126 * due to the flush group being over-full and we should
2127 * flush what we have.
2129 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2130 hammer_setup_child_callback, NULL);
2134 * This is a more involved test that includes go_count. If we
2135 * can't flush, flag the inode and return. If go_count is 0 we
2136 * were are unable to flush any records in our rec_tree and
2137 * must ignore the XDIRTY flag.
2139 if (go_count == 0) {
2140 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
2141 --hmp->count_iqueued;
2142 --hammer_count_iqueued;
2145 ip->flush_state = HAMMER_FST_SETUP;
2146 ip->flush_group = NULL;
2147 if (flags & HAMMER_FLUSH_SIGNAL) {
2148 ip->flags |= HAMMER_INODE_REFLUSH |
2149 HAMMER_INODE_RESIGNAL;
2151 ip->flags |= HAMMER_INODE_REFLUSH;
2154 if (ip->flags & HAMMER_INODE_VHELD) {
2155 ip->flags &= ~HAMMER_INODE_VHELD;
2161 * REFLUSH is needed to trigger dependancy wakeups
2162 * when an inode is in SETUP.
2164 ip->flags |= HAMMER_INODE_REFLUSH;
2165 if (--hmp->flusher.group_lock == 0)
2166 wakeup(&hmp->flusher.group_lock);
2172 * Snapshot the state of the inode for the backend flusher.
2174 * We continue to retain save_trunc_off even when all truncations
2175 * have been resolved as an optimization to determine if we can
2176 * skip the B-Tree lookup for overwrite deletions.
2178 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
2179 * and stays in ip->flags. Once set, it stays set until the
2180 * inode is destroyed.
2182 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2183 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0);
2184 ip->sync_trunc_off = ip->trunc_off;
2185 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
2186 ip->flags &= ~HAMMER_INODE_TRUNCATED;
2187 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
2190 * The save_trunc_off used to cache whether the B-Tree
2191 * holds any records past that point is not used until
2192 * after the truncation has succeeded, so we can safely
2195 if (ip->save_trunc_off > ip->sync_trunc_off)
2196 ip->save_trunc_off = ip->sync_trunc_off;
2198 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK &
2199 ~HAMMER_INODE_TRUNCATED);
2200 ip->sync_ino_leaf = ip->ino_leaf;
2201 ip->sync_ino_data = ip->ino_data;
2202 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED;
2203 #ifdef DEBUG_TRUNCATE
2204 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp)
2205 kprintf("truncateS %016llx\n", ip->sync_trunc_off);
2209 * The flusher list inherits our inode and reference.
2211 KKASSERT(flg->running == 0);
2212 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip);
2213 if (--hmp->flusher.group_lock == 0)
2214 wakeup(&hmp->flusher.group_lock);
2217 * Auto-flush the group if it grows too large. Make sure the
2218 * inode reclaim wait pipeline continues to work.
2220 if (flg->total_count >= hammer_autoflush ||
2221 flg->total_count >= hammer_limit_reclaims / 4) {
2222 if (hmp->fill_flush_group == flg)
2223 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
2224 hammer_flusher_async(hmp, flg);
2229 * Callback for scan of ip->rec_tree. Try to include each record in our
2230 * flush. ip->flush_group has been set but the inode has not yet been
2231 * moved into a flushing state.
2233 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
2236 * We return 1 for any record placed or found in FST_FLUSH, which prevents
2237 * the caller from shortcutting the flush.
2240 hammer_setup_child_callback(hammer_record_t rec, void *data)
2242 hammer_flush_group_t flg;
2243 hammer_inode_t target_ip;
2248 * Records deleted or committed by the backend are ignored.
2249 * Note that the flush detects deleted frontend records at
2250 * multiple points to deal with races. This is just the first
2251 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot
2252 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it
2253 * messes up link-count calculations.
2255 * NOTE: Don't get confused between record deletion and, say,
2256 * directory entry deletion. The deletion of a directory entry
2257 * which is on-media has nothing to do with the record deletion
2260 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE |
2261 HAMMER_RECF_COMMITTED)) {
2262 if (rec->flush_state == HAMMER_FST_FLUSH) {
2263 KKASSERT(rec->flush_group == rec->ip->flush_group);
2272 * If the record is in an idle state it has no dependancies and
2276 flg = ip->flush_group;
2279 switch(rec->flush_state) {
2280 case HAMMER_FST_IDLE:
2282 * The record has no setup dependancy, we can flush it.
2284 KKASSERT(rec->target_ip == NULL);
2285 rec->flush_state = HAMMER_FST_FLUSH;
2286 rec->flush_group = flg;
2288 hammer_ref(&rec->lock);
2291 case HAMMER_FST_SETUP:
2293 * The record has a setup dependancy. These are typically
2294 * directory entry adds and deletes. Such entries will be
2295 * flushed when their inodes are flushed so we do not
2296 * usually have to add them to the flush here. However,
2297 * if the target_ip has set HAMMER_INODE_CONN_DOWN then
2298 * it is asking us to flush this record (and it).
2300 target_ip = rec->target_ip;
2301 KKASSERT(target_ip != NULL);
2302 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
2305 * If the target IP is already flushing in our group
2306 * we could associate the record, but target_ip has
2307 * already synced ino_data to sync_ino_data and we
2308 * would also have to adjust nlinks. Plus there are
2309 * ordering issues for adds and deletes.
2311 * Reflush downward if this is an ADD, and upward if
2314 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
2315 if (rec->type == HAMMER_MEM_RECORD_ADD)
2316 ip->flags |= HAMMER_INODE_REFLUSH;
2318 target_ip->flags |= HAMMER_INODE_REFLUSH;
2323 * Target IP is not yet flushing. This can get complex
2324 * because we have to be careful about the recursion.
2326 * Directories create an issue for us in that if a flush
2327 * of a directory is requested the expectation is to flush
2328 * any pending directory entries, but this will cause the
2329 * related inodes to recursively flush as well. We can't
2330 * really defer the operation so just get as many as we
2334 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 &&
2335 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) {
2337 * We aren't reclaiming and the target ip was not
2338 * previously prevented from flushing due to this
2339 * record dependancy. Do not flush this record.
2344 if (flg->total_count + flg->refs >
2345 ip->hmp->undo_rec_limit) {
2347 * Our flush group is over-full and we risk blowing
2348 * out the UNDO FIFO. Stop the scan, flush what we
2349 * have, then reflush the directory.
2351 * The directory may be forced through multiple
2352 * flush groups before it can be completely
2355 ip->flags |= HAMMER_INODE_RESIGNAL |
2356 HAMMER_INODE_REFLUSH;
2358 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
2360 * If the target IP is not flushing we can force
2361 * it to flush, even if it is unable to write out
2362 * any of its own records we have at least one in
2363 * hand that we CAN deal with.
2365 rec->flush_state = HAMMER_FST_FLUSH;
2366 rec->flush_group = flg;
2368 hammer_ref(&rec->lock);
2369 hammer_flush_inode_core(target_ip, flg,
2370 HAMMER_FLUSH_RECURSION);
2374 * General or delete-on-disk record.
2376 * XXX this needs help. If a delete-on-disk we could
2377 * disconnect the target. If the target has its own
2378 * dependancies they really need to be flushed.
2382 rec->flush_state = HAMMER_FST_FLUSH;
2383 rec->flush_group = flg;
2385 hammer_ref(&rec->lock);
2386 hammer_flush_inode_core(target_ip, flg,
2387 HAMMER_FLUSH_RECURSION);
2391 case HAMMER_FST_FLUSH:
2393 * The record could be part of a previous flush group if the
2394 * inode is a directory (the record being a directory entry).
2395 * Once the flush group was closed a hammer_test_inode()
2396 * function can cause a new flush group to be setup, placing
2397 * the directory inode itself in a new flush group.
2399 * When associated with a previous flush group we count it
2400 * as if it were in our current flush group, since it will
2401 * effectively be flushed by the time we flush our current
2405 rec->ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY ||
2406 rec->flush_group == flg);
2415 * This version just moves records already in a flush state to the new
2416 * flush group and that is it.
2419 hammer_syncgrp_child_callback(hammer_record_t rec, void *data)
2421 hammer_inode_t ip = rec->ip;
2423 switch(rec->flush_state) {
2424 case HAMMER_FST_FLUSH:
2425 KKASSERT(rec->flush_group == ip->flush_group);
2435 * Wait for a previously queued flush to complete.
2437 * If a critical error occured we don't try to wait.
2440 hammer_wait_inode(hammer_inode_t ip)
2443 * The inode can be in a SETUP state in which case RESIGNAL
2444 * should be set. If RESIGNAL is not set then the previous
2445 * flush completed and a later operation placed the inode
2446 * in a passive setup state again, so we're done.
2448 * The inode can be in a FLUSH state in which case we
2449 * can just wait for completion.
2451 while (ip->flush_state == HAMMER_FST_FLUSH ||
2452 (ip->flush_state == HAMMER_FST_SETUP &&
2453 (ip->flags & HAMMER_INODE_RESIGNAL))) {
2455 * Don't try to flush on a critical error
2457 if (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR)
2461 * If the inode was already being flushed its flg
2462 * may not have been queued to the backend. We
2463 * have to make sure it gets queued or we can wind
2464 * up blocked or deadlocked (particularly if we are
2465 * the vnlru thread).
2467 if (ip->flush_state == HAMMER_FST_FLUSH) {
2468 KKASSERT(ip->flush_group);
2469 if (ip->flush_group->closed == 0) {
2470 if (hammer_debug_inode) {
2471 kprintf("hammer: debug: forcing "
2472 "async flush ip %016jx\n",
2473 (intmax_t)ip->obj_id);
2475 hammer_flusher_async(ip->hmp,
2477 continue; /* retest */
2482 * In a flush state with the flg queued to the backend
2483 * or in a setup state with RESIGNAL set, we can safely
2486 ip->flags |= HAMMER_INODE_FLUSHW;
2487 tsleep(&ip->flags, 0, "hmrwin", 0);
2492 * The inode may have been in a passive setup state,
2493 * call flush to make sure we get signaled.
2495 if (ip->flush_state == HAMMER_FST_SETUP)
2496 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2502 * Called by the backend code when a flush has been completed.
2503 * The inode has already been removed from the flush list.
2505 * A pipelined flush can occur, in which case we must re-enter the
2506 * inode on the list and re-copy its fields.
2509 hammer_flush_inode_done(hammer_inode_t ip, int error)
2514 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
2519 * Auto-reflush if the backend could not completely flush
2520 * the inode. This fixes a case where a deferred buffer flush
2521 * could cause fsync to return early.
2523 if (ip->sync_flags & HAMMER_INODE_MODMASK)
2524 ip->flags |= HAMMER_INODE_REFLUSH;
2527 * Merge left-over flags back into the frontend and fix the state.
2528 * Incomplete truncations are retained by the backend.
2531 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED;
2532 ip->sync_flags &= HAMMER_INODE_TRUNCATED;
2535 * The backend may have adjusted nlinks, so if the adjusted nlinks
2536 * does not match the fronttend set the frontend's DDIRTY flag again.
2538 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
2539 ip->flags |= HAMMER_INODE_DDIRTY;
2542 * Fix up the dirty buffer status.
2544 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
2545 ip->flags |= HAMMER_INODE_BUFS;
2547 hammer_redo_fifo_end_flush(ip);
2550 * Re-set the XDIRTY flag if some of the inode's in-memory records
2551 * could not be flushed.
2553 KKASSERT((RB_EMPTY(&ip->rec_tree) &&
2554 (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
2555 (!RB_EMPTY(&ip->rec_tree) &&
2556 (ip->flags & HAMMER_INODE_XDIRTY) != 0));
2559 * Do not lose track of inodes which no longer have vnode
2560 * assocations, otherwise they may never get flushed again.
2562 * The reflush flag can be set superfluously, causing extra pain
2563 * for no reason. If the inode is no longer modified it no longer
2564 * needs to be flushed.
2566 if (ip->flags & HAMMER_INODE_MODMASK) {
2568 ip->flags |= HAMMER_INODE_REFLUSH;
2570 ip->flags &= ~HAMMER_INODE_REFLUSH;
2572 if (ip->flags & HAMMER_INODE_MODMASK)
2573 hammer_inode_dirty(ip);
2576 * Adjust the flush state.
2578 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2580 * We were unable to flush out all our records, leave the
2581 * inode in a flush state and in the current flush group.
2582 * The flush group will be re-run.
2584 * This occurs if the UNDO block gets too full or there is
2585 * too much dirty meta-data and allows the flusher to
2586 * finalize the UNDO block and then re-flush.
2588 ip->flags &= ~HAMMER_INODE_WOULDBLOCK;
2592 * Remove from the flush_group
2594 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
2595 ip->flush_group = NULL;
2599 * Clean up the vnode ref and tracking counts.
2601 if (ip->flags & HAMMER_INODE_VHELD) {
2602 ip->flags &= ~HAMMER_INODE_VHELD;
2606 --hmp->count_iqueued;
2607 --hammer_count_iqueued;
2610 * And adjust the state.
2612 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
2613 ip->flush_state = HAMMER_FST_IDLE;
2616 ip->flush_state = HAMMER_FST_SETUP;
2621 * If the frontend is waiting for a flush to complete,
2624 if (ip->flags & HAMMER_INODE_FLUSHW) {
2625 ip->flags &= ~HAMMER_INODE_FLUSHW;
2630 * If the frontend made more changes and requested another
2631 * flush, then try to get it running.
2633 * Reflushes are aborted when the inode is errored out.
2635 if (ip->flags & HAMMER_INODE_REFLUSH) {
2636 ip->flags &= ~HAMMER_INODE_REFLUSH;
2637 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2638 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2639 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2641 hammer_flush_inode(ip, 0);
2647 * If we have no parent dependancies we can clear CONN_DOWN
2649 if (TAILQ_EMPTY(&ip->target_list))
2650 ip->flags &= ~HAMMER_INODE_CONN_DOWN;
2653 * If the inode is now clean drop the space reservation.
2655 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
2656 (ip->flags & HAMMER_INODE_RSV_INODES)) {
2657 ip->flags &= ~HAMMER_INODE_RSV_INODES;
2661 ip->flags &= ~HAMMER_INODE_SLAVEFLUSH;
2664 hammer_rel_inode(ip, 0);
2668 * Called from hammer_sync_inode() to synchronize in-memory records
2672 hammer_sync_record_callback(hammer_record_t record, void *data)
2674 hammer_cursor_t cursor = data;
2675 hammer_transaction_t trans = cursor->trans;
2676 hammer_mount_t hmp = trans->hmp;
2680 * Skip records that do not belong to the current flush.
2682 ++hammer_stats_record_iterations;
2683 if (record->flush_state != HAMMER_FST_FLUSH)
2687 if (record->flush_group != record->ip->flush_group) {
2688 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group);
2689 if (hammer_debug_critical)
2694 KKASSERT(record->flush_group == record->ip->flush_group);
2697 * Interlock the record using the BE flag. Once BE is set the
2698 * frontend cannot change the state of FE.
2700 * NOTE: If FE is set prior to us setting BE we still sync the
2701 * record out, but the flush completion code converts it to
2702 * a delete-on-disk record instead of destroying it.
2704 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
2705 record->flags |= HAMMER_RECF_INTERLOCK_BE;
2708 * The backend has already disposed of the record.
2710 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) {
2716 * If the whole inode is being deleted and all on-disk records will
2717 * be deleted very soon, we can't sync any new records to disk
2718 * because they will be deleted in the same transaction they were
2719 * created in (delete_tid == create_tid), which will assert.
2721 * XXX There may be a case with RECORD_ADD with DELETED_FE set
2722 * that we currently panic on.
2724 if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
2725 switch(record->type) {
2726 case HAMMER_MEM_RECORD_DATA:
2728 * We don't have to do anything, if the record was
2729 * committed the space will have been accounted for
2733 case HAMMER_MEM_RECORD_GENERAL:
2735 * Set deleted-by-backend flag. Do not set the
2736 * backend committed flag, because we are throwing
2739 record->flags |= HAMMER_RECF_DELETED_BE;
2740 ++record->ip->rec_generation;
2743 case HAMMER_MEM_RECORD_ADD:
2744 panic("hammer_sync_record_callback: illegal add "
2745 "during inode deletion record %p", record);
2746 break; /* NOT REACHED */
2747 case HAMMER_MEM_RECORD_INODE:
2748 panic("hammer_sync_record_callback: attempt to "
2749 "sync inode record %p?", record);
2750 break; /* NOT REACHED */
2751 case HAMMER_MEM_RECORD_DEL:
2753 * Follow through and issue the on-disk deletion
2760 * If DELETED_FE is set special handling is needed for directory
2761 * entries. Dependant pieces related to the directory entry may
2762 * have already been synced to disk. If this occurs we have to
2763 * sync the directory entry and then change the in-memory record
2764 * from an ADD to a DELETE to cover the fact that it's been
2765 * deleted by the frontend.
2767 * A directory delete covering record (MEM_RECORD_DEL) can never
2768 * be deleted by the frontend.
2770 * Any other record type (aka DATA) can be deleted by the frontend.
2771 * XXX At the moment the flusher must skip it because there may
2772 * be another data record in the flush group for the same block,
2773 * meaning that some frontend data changes can leak into the backend's
2774 * synchronization point.
2776 if (record->flags & HAMMER_RECF_DELETED_FE) {
2777 if (record->type == HAMMER_MEM_RECORD_ADD) {
2779 * Convert a front-end deleted directory-add to
2780 * a directory-delete entry later.
2782 record->flags |= HAMMER_RECF_CONVERT_DELETE;
2785 * Dispose of the record (race case). Mark as
2786 * deleted by backend (and not committed).
2788 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
2789 record->flags |= HAMMER_RECF_DELETED_BE;
2790 ++record->ip->rec_generation;
2797 * Assign the create_tid for new records. Deletions already
2798 * have the record's entire key properly set up.
2800 if (record->type != HAMMER_MEM_RECORD_DEL) {
2801 record->leaf.base.create_tid = trans->tid;
2802 record->leaf.create_ts = trans->time32;
2806 * This actually moves the record to the on-media B-Tree. We
2807 * must also generate REDO_TERM entries in the UNDO/REDO FIFO
2808 * indicating that the related REDO_WRITE(s) have been committed.
2810 * During recovery any REDO_TERM's within the nominal recovery span
2811 * are ignored since the related meta-data is being undone, causing
2812 * any matching REDO_WRITEs to execute. The REDO_TERMs outside
2813 * the nominal recovery span will match against REDO_WRITEs and
2814 * prevent them from being executed (because the meta-data has
2815 * already been synchronized).
2817 if (record->flags & HAMMER_RECF_REDO) {
2818 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA);
2819 hammer_generate_redo(trans, record->ip,
2820 record->leaf.base.key -
2821 record->leaf.data_len,
2822 HAMMER_REDO_TERM_WRITE,
2824 record->leaf.data_len);
2828 error = hammer_ip_sync_record_cursor(cursor, record);
2829 if (error != EDEADLK)
2831 hammer_done_cursor(cursor);
2832 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
2837 record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
2842 hammer_flush_record_done(record, error);
2845 * Do partial finalization if we have built up too many dirty
2846 * buffers. Otherwise a buffer cache deadlock can occur when
2847 * doing things like creating tens of thousands of tiny files.
2849 * We must release our cursor lock to avoid a 3-way deadlock
2850 * due to the exclusive sync lock the finalizer must get.
2852 * WARNING: See warnings in hammer_unlock_cursor() function.
2854 if (hammer_flusher_meta_limit(hmp) ||
2855 vm_page_count_severe()) {
2856 hammer_unlock_cursor(cursor);
2857 hammer_flusher_finalize(trans, 0);
2858 hammer_lock_cursor(cursor);
2864 * Backend function called by the flusher to sync an inode to media.
2867 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip)
2869 struct hammer_cursor cursor;
2870 hammer_node_t tmp_node;
2871 hammer_record_t depend;
2872 hammer_record_t next;
2873 int error, tmp_error;
2876 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
2879 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
2884 * Any directory records referencing this inode which are not in
2885 * our current flush group must adjust our nlink count for the
2886 * purposes of synchronizating to disk.
2888 * Records which are in our flush group can be unlinked from our
2889 * inode now, potentially allowing the inode to be physically
2892 * This cannot block.
2894 nlinks = ip->ino_data.nlinks;
2895 next = TAILQ_FIRST(&ip->target_list);
2896 while ((depend = next) != NULL) {
2897 next = TAILQ_NEXT(depend, target_entry);
2898 if (depend->flush_state == HAMMER_FST_FLUSH &&
2899 depend->flush_group == ip->flush_group) {
2901 * If this is an ADD that was deleted by the frontend
2902 * the frontend nlinks count will have already been
2903 * decremented, but the backend is going to sync its
2904 * directory entry and must account for it. The
2905 * record will be converted to a delete-on-disk when
2908 * If the ADD was not deleted by the frontend we
2909 * can remove the dependancy from our target_list.
2911 if (depend->flags & HAMMER_RECF_DELETED_FE) {
2914 TAILQ_REMOVE(&ip->target_list, depend,
2916 depend->target_ip = NULL;
2918 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
2920 * Not part of our flush group and not deleted by
2921 * the front-end, adjust the link count synced to
2922 * the media (undo what the frontend did when it
2923 * queued the record).
2925 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
2926 switch(depend->type) {
2927 case HAMMER_MEM_RECORD_ADD:
2930 case HAMMER_MEM_RECORD_DEL:
2940 * Set dirty if we had to modify the link count.
2942 if (ip->sync_ino_data.nlinks != nlinks) {
2943 KKASSERT((int64_t)nlinks >= 0);
2944 ip->sync_ino_data.nlinks = nlinks;
2945 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2949 * If there is a trunction queued destroy any data past the (aligned)
2950 * truncation point. Userland will have dealt with the buffer
2951 * containing the truncation point for us.
2953 * We don't flush pending frontend data buffers until after we've
2954 * dealt with the truncation.
2956 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2958 * Interlock trunc_off. The VOP front-end may continue to
2959 * make adjustments to it while we are blocked.
2962 off_t aligned_trunc_off;
2965 trunc_off = ip->sync_trunc_off;
2966 blkmask = hammer_blocksize(trunc_off) - 1;
2967 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask;
2970 * Delete any whole blocks on-media. The front-end has
2971 * already cleaned out any partial block and made it
2972 * pending. The front-end may have updated trunc_off
2973 * while we were blocked so we only use sync_trunc_off.
2975 * This operation can blow out the buffer cache, EWOULDBLOCK
2976 * means we were unable to complete the deletion. The
2977 * deletion will update sync_trunc_off in that case.
2979 error = hammer_ip_delete_range(&cursor, ip,
2981 0x7FFFFFFFFFFFFFFFLL, 2);
2982 if (error == EWOULDBLOCK) {
2983 ip->flags |= HAMMER_INODE_WOULDBLOCK;
2985 goto defer_buffer_flush;
2992 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO.
2994 * XXX we do this even if we did not previously generate
2995 * a REDO_TRUNC record. This operation may enclosed the
2996 * range for multiple prior truncation entries in the REDO
2999 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR &&
3000 (ip->flags & HAMMER_INODE_RDIRTY)) {
3001 hammer_generate_redo(trans, ip, aligned_trunc_off,
3002 HAMMER_REDO_TERM_TRUNC,
3007 * Clear the truncation flag on the backend after we have
3008 * completed the deletions. Backend data is now good again
3009 * (including new records we are about to sync, below).
3011 * Leave sync_trunc_off intact. As we write additional
3012 * records the backend will update sync_trunc_off. This
3013 * tells the backend whether it can skip the overwrite
3014 * test. This should work properly even when the backend
3015 * writes full blocks where the truncation point straddles
3016 * the block because the comparison is against the base
3017 * offset of the record.
3019 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
3020 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */
3026 * Now sync related records. These will typically be directory
3027 * entries, records tracking direct-writes, or delete-on-disk records.
3030 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
3031 hammer_sync_record_callback, &cursor);
3037 hammer_cache_node(&ip->cache[1], cursor.node);
3040 * Re-seek for inode update, assuming our cache hasn't been ripped
3041 * out from under us.
3044 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error);
3046 hammer_cursor_downgrade(&cursor);
3047 hammer_lock_sh(&tmp_node->lock);
3048 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0)
3049 hammer_cursor_seek(&cursor, tmp_node, 0);
3050 hammer_unlock(&tmp_node->lock);
3051 hammer_rel_node(tmp_node);
3057 * If we are deleting the inode the frontend had better not have
3058 * any active references on elements making up the inode.
3060 * The call to hammer_ip_delete_clean() cleans up auxillary records
3061 * but not DB or DATA records. Those must have already been deleted
3062 * by the normal truncation mechanic.
3064 if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
3065 RB_EMPTY(&ip->rec_tree) &&
3066 (ip->sync_flags & HAMMER_INODE_DELETING) &&
3067 (ip->flags & HAMMER_INODE_DELETED) == 0) {
3070 error = hammer_ip_delete_clean(&cursor, ip, &count1);
3072 ip->flags |= HAMMER_INODE_DELETED;
3073 ip->sync_flags &= ~HAMMER_INODE_DELETING;
3074 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
3075 KKASSERT(RB_EMPTY(&ip->rec_tree));
3078 * Set delete_tid in both the frontend and backend
3079 * copy of the inode record. The DELETED flag handles
3080 * this, do not set DDIRTY.
3082 ip->ino_leaf.base.delete_tid = trans->tid;
3083 ip->sync_ino_leaf.base.delete_tid = trans->tid;
3084 ip->ino_leaf.delete_ts = trans->time32;
3085 ip->sync_ino_leaf.delete_ts = trans->time32;
3089 * Adjust the inode count in the volume header
3091 hammer_sync_lock_sh(trans);
3092 if (ip->flags & HAMMER_INODE_ONDISK) {
3093 hammer_modify_volume_field(trans,
3096 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
3097 hammer_modify_volume_done(trans->rootvol);
3099 hammer_sync_unlock(trans);
3105 ip->sync_flags &= ~HAMMER_INODE_BUFS;
3109 * Now update the inode's on-disk inode-data and/or on-disk record.
3110 * DELETED and ONDISK are managed only in ip->flags.
3112 * In the case of a defered buffer flush we still update the on-disk
3113 * inode to satisfy visibility requirements if there happen to be
3114 * directory dependancies.
3116 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
3117 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
3119 * If deleted and on-disk, don't set any additional flags.
3120 * the delete flag takes care of things.
3122 * Clear flags which may have been set by the frontend.
3124 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3125 HAMMER_INODE_SDIRTY |
3126 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3127 HAMMER_INODE_DELETING);
3129 case HAMMER_INODE_DELETED:
3131 * Take care of the case where a deleted inode was never
3132 * flushed to the disk in the first place.
3134 * Clear flags which may have been set by the frontend.
3136 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3137 HAMMER_INODE_SDIRTY |
3138 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3139 HAMMER_INODE_DELETING);
3140 while (RB_ROOT(&ip->rec_tree)) {
3141 hammer_record_t record = RB_ROOT(&ip->rec_tree);
3142 hammer_ref(&record->lock);
3143 KKASSERT(hammer_oneref(&record->lock));
3144 record->flags |= HAMMER_RECF_DELETED_BE;
3145 ++record->ip->rec_generation;
3146 hammer_rel_mem_record(record);
3149 case HAMMER_INODE_ONDISK:
3151 * If already on-disk, do not set any additional flags.
3156 * If not on-disk and not deleted, set DDIRTY to force
3157 * an initial record to be written.
3159 * Also set the create_tid in both the frontend and backend
3160 * copy of the inode record.
3162 ip->ino_leaf.base.create_tid = trans->tid;
3163 ip->ino_leaf.create_ts = trans->time32;
3164 ip->sync_ino_leaf.base.create_tid = trans->tid;
3165 ip->sync_ino_leaf.create_ts = trans->time32;
3166 ip->sync_flags |= HAMMER_INODE_DDIRTY;
3171 * If DDIRTY or SDIRTY is set, write out a new record.
3172 * If the inode is already on-disk the old record is marked as
3175 * If DELETED is set hammer_update_inode() will delete the existing
3176 * record without writing out a new one.
3178 * If *ONLY* the ITIMES flag is set we can update the record in-place.
3180 if (ip->flags & HAMMER_INODE_DELETED) {
3181 error = hammer_update_inode(&cursor, ip);
3183 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) &&
3184 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) {
3185 error = hammer_update_itimes(&cursor, ip);
3187 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY |
3188 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
3189 error = hammer_update_inode(&cursor, ip);
3192 if (ip->flags & HAMMER_INODE_MODMASK)
3193 hammer_inode_dirty(ip);
3195 hammer_critical_error(ip->hmp, ip, error,
3196 "while syncing inode");
3198 hammer_done_cursor(&cursor);
3203 * This routine is called when the OS is no longer actively referencing
3204 * the inode (but might still be keeping it cached), or when releasing
3205 * the last reference to an inode.
3207 * At this point if the inode's nlinks count is zero we want to destroy
3208 * it, which may mean destroying it on-media too.
3211 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
3216 * Set the DELETING flag when the link count drops to 0 and the
3217 * OS no longer has any opens on the inode.
3219 * The backend will clear DELETING (a mod flag) and set DELETED
3220 * (a state flag) when it is actually able to perform the
3223 * Don't reflag the deletion if the flusher is currently syncing
3224 * one that was already flagged. A previously set DELETING flag
3225 * may bounce around flags and sync_flags until the operation is
3228 * Do not attempt to modify a snapshot inode (one set to read-only).
3230 if (ip->ino_data.nlinks == 0 &&
3231 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_RO|HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
3232 ip->flags |= HAMMER_INODE_DELETING;
3233 ip->flags |= HAMMER_INODE_TRUNCATED;
3237 if (hammer_get_vnode(ip, &vp) != 0)
3245 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0, 0);
3246 if (ip->flags & HAMMER_INODE_MODMASK)
3247 hammer_inode_dirty(ip);
3254 * After potentially resolving a dependancy the inode is tested
3255 * to determine whether it needs to be reflushed.
3258 hammer_test_inode(hammer_inode_t ip)
3260 if (ip->flags & HAMMER_INODE_REFLUSH) {
3261 ip->flags &= ~HAMMER_INODE_REFLUSH;
3262 hammer_ref(&ip->lock);
3263 if (ip->flags & HAMMER_INODE_RESIGNAL) {
3264 ip->flags &= ~HAMMER_INODE_RESIGNAL;
3265 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
3267 hammer_flush_inode(ip, 0);
3269 hammer_rel_inode(ip, 0);
3274 * Clear the RECLAIM flag on an inode. This occurs when the inode is
3275 * reassociated with a vp or just before it gets freed.
3277 * Pipeline wakeups to threads blocked due to an excessive number of
3278 * detached inodes. This typically occurs when atime updates accumulate
3279 * while scanning a directory tree.
3282 hammer_inode_wakereclaims(hammer_inode_t ip)
3284 struct hammer_reclaim *reclaim;
3285 hammer_mount_t hmp = ip->hmp;
3287 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0)
3290 --hammer_count_reclaims;
3291 --hmp->count_reclaims;
3292 ip->flags &= ~HAMMER_INODE_RECLAIM;
3294 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) {
3295 KKASSERT(reclaim->count > 0);
3296 if (--reclaim->count == 0) {
3297 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry);
3304 * Setup our reclaim pipeline. We only let so many detached (and dirty)
3305 * inodes build up before we start blocking. This routine is called
3306 * if a new inode is created or an inode is loaded from media.
3308 * When we block we don't care *which* inode has finished reclaiming,
3309 * as long as one does.
3311 * The reclaim pipeline is primarily governed by the auto-flush which is
3312 * 1/4 hammer_limit_reclaims. We don't want to block if the count is
3313 * less than 1/2 hammer_limit_reclaims. From 1/2 to full count is
3314 * dynamically governed.
3317 hammer_inode_waitreclaims(hammer_transaction_t trans)
3319 hammer_mount_t hmp = trans->hmp;
3320 struct hammer_reclaim reclaim;
3324 * Track inode load, delay if the number of reclaiming inodes is
3325 * between 2/4 and 4/4 hammer_limit_reclaims, depending.
3327 if (curthread->td_proc) {
3328 struct hammer_inostats *stats;
3330 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid);
3333 if (stats->count > hammer_limit_reclaims / 2)
3334 stats->count = hammer_limit_reclaims / 2;
3335 lower_limit = hammer_limit_reclaims - stats->count;
3336 if (hammer_debug_general & 0x10000) {
3337 kprintf("pid %5d limit %d\n",
3338 (int)curthread->td_proc->p_pid, lower_limit);
3341 lower_limit = hammer_limit_reclaims * 3 / 4;
3343 if (hmp->count_reclaims >= lower_limit) {
3345 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry);
3346 tsleep(&reclaim, 0, "hmrrcm", hz);
3347 if (reclaim.count > 0)
3348 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry);
3353 * Keep track of reclaim statistics on a per-pid basis using a loose
3354 * 4-way set associative hash table. Collisions inherit the count of
3355 * the previous entry.
3357 * NOTE: We want to be careful here to limit the chain size. If the chain
3358 * size is too large a pid will spread its stats out over too many
3359 * entries under certain types of heavy filesystem activity and
3360 * wind up not delaying long enough.
3363 struct hammer_inostats *
3364 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid)
3366 struct hammer_inostats *stats;
3369 static volatile int iterator; /* we don't care about MP races */
3372 * Chain up to 4 times to find our entry.
3374 for (chain = 0; chain < 4; ++chain) {
3375 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK];
3376 if (stats->pid == pid)
3381 * Replace one of the four chaining entries with our new entry.
3384 stats = &hmp->inostats[(pid + (iterator++ & 3)) &
3385 HAMMER_INOSTATS_HMASK];
3392 if (stats->count && stats->ltick != ticks) {
3393 delta = ticks - stats->ltick;
3394 stats->ltick = ticks;
3395 if (delta <= 0 || delta > hz * 60)
3398 stats->count = stats->count * hz / (hz + delta);
3400 if (hammer_debug_general & 0x10000)
3401 kprintf("pid %5d stats %d\n", (int)pid, stats->count);
3408 * XXX not used, doesn't work very well due to the large batching nature
3411 * A larger then normal backlog of inodes is sitting in the flusher,
3412 * enforce a general slowdown to let it catch up. This routine is only
3413 * called on completion of a non-flusher-related transaction which
3414 * performed B-Tree node I/O.
3416 * It is possible for the flusher to stall in a continuous load.
3417 * blogbench -i1000 -o seems to do a good job generating this sort of load.
3418 * If the flusher is unable to catch up the inode count can bloat until
3419 * we run out of kvm.
3421 * This is a bit of a hack.
3424 hammer_inode_waithard(hammer_mount_t hmp)
3429 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) {
3430 if (hmp->count_reclaims < hammer_limit_reclaims / 2 &&
3431 hmp->count_iqueued < hmp->count_inodes / 20) {
3432 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY;
3436 if (hmp->count_reclaims < hammer_limit_reclaims ||
3437 hmp->count_iqueued < hmp->count_inodes / 10) {
3440 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY;
3444 * Block for one flush cycle.
3446 hammer_flusher_wait_next(hmp);