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>
42 static int hammer_unload_inode(struct hammer_inode *ip);
43 static void hammer_free_inode(hammer_inode_t ip);
44 static void hammer_flush_inode_core(hammer_inode_t ip,
45 hammer_flush_group_t flg, int flags);
46 static int hammer_setup_child_callback(hammer_record_t rec, void *data);
48 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data);
50 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
51 hammer_flush_group_t flg);
52 static int hammer_setup_parent_inodes_helper(hammer_record_t record,
53 int depth, hammer_flush_group_t flg);
54 static void hammer_inode_wakereclaims(hammer_inode_t ip);
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 * RB-Tree support for inode structures / special LOOKUP_INFO
85 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip)
87 if (info->obj_localization < ip->obj_localization)
89 if (info->obj_localization > ip->obj_localization)
91 if (info->obj_id < ip->obj_id)
93 if (info->obj_id > ip->obj_id)
95 if (info->obj_asof < ip->obj_asof)
97 if (info->obj_asof > ip->obj_asof)
103 * Used by hammer_scan_inode_snapshots() to locate all of an object's
104 * snapshots. Note that the asof field is not tested, which we can get
105 * away with because it is the lowest-priority field.
108 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data)
110 hammer_inode_info_t info = data;
112 if (ip->obj_localization > info->obj_localization)
114 if (ip->obj_localization < info->obj_localization)
116 if (ip->obj_id > info->obj_id)
118 if (ip->obj_id < info->obj_id)
124 * Used by hammer_unload_pseudofs() to locate all inodes associated with
128 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data)
130 u_int32_t localization = *(u_int32_t *)data;
131 if (ip->obj_localization > localization)
133 if (ip->obj_localization < localization)
139 * RB-Tree support for pseudofs structures
142 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2)
144 if (p1->localization < p2->localization)
146 if (p1->localization > p2->localization)
152 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare);
153 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node,
154 hammer_inode_info_cmp, hammer_inode_info_t);
155 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node,
156 hammer_pfs_rb_compare, u_int32_t, localization);
159 * The kernel is not actively referencing this vnode but is still holding
162 * This is called from the frontend.
165 hammer_vop_inactive(struct vop_inactive_args *ap)
167 struct hammer_inode *ip = VTOI(ap->a_vp);
178 * If the inode no longer has visibility in the filesystem try to
179 * recycle it immediately, even if the inode is dirty. Recycling
180 * it quickly allows the system to reclaim buffer cache and VM
181 * resources which can matter a lot in a heavily loaded system.
183 * This can deadlock in vfsync() if we aren't careful.
185 * Do not queue the inode to the flusher if we still have visibility,
186 * otherwise namespace calls such as chmod will unnecessarily generate
187 * multiple inode updates.
189 hammer_inode_unloadable_check(ip, 0);
190 if (ip->ino_data.nlinks == 0) {
191 if (ip->flags & HAMMER_INODE_MODMASK)
192 hammer_flush_inode(ip, 0);
199 * Release the vnode association. This is typically (but not always)
200 * the last reference on the inode.
202 * Once the association is lost we are on our own with regards to
203 * flushing the inode.
206 hammer_vop_reclaim(struct vop_reclaim_args *ap)
208 struct hammer_inode *ip;
214 if ((ip = vp->v_data) != NULL) {
219 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) {
220 ++hammer_count_reclaiming;
221 ++hmp->inode_reclaims;
222 ip->flags |= HAMMER_INODE_RECLAIM;
224 hammer_rel_inode(ip, 1);
230 * Return a locked vnode for the specified inode. The inode must be
231 * referenced but NOT LOCKED on entry and will remain referenced on
234 * Called from the frontend.
237 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp)
247 if ((vp = ip->vp) == NULL) {
248 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0);
251 hammer_lock_ex(&ip->lock);
252 if (ip->vp != NULL) {
253 hammer_unlock(&ip->lock);
259 hammer_ref(&ip->lock);
263 obj_type = ip->ino_data.obj_type;
264 vp->v_type = hammer_get_vnode_type(obj_type);
266 hammer_inode_wakereclaims(ip);
268 switch(ip->ino_data.obj_type) {
269 case HAMMER_OBJTYPE_CDEV:
270 case HAMMER_OBJTYPE_BDEV:
271 vp->v_ops = &hmp->mp->mnt_vn_spec_ops;
272 addaliasu(vp, ip->ino_data.rmajor,
273 ip->ino_data.rminor);
275 case HAMMER_OBJTYPE_FIFO:
276 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops;
278 case HAMMER_OBJTYPE_REGFILE:
285 * Only mark as the root vnode if the ip is not
286 * historical, otherwise the VFS cache will get
287 * confused. The other half of the special handling
288 * is in hammer_vop_nlookupdotdot().
290 * Pseudo-filesystem roots can be accessed via
291 * non-root filesystem paths and setting VROOT may
292 * confuse the namecache. Set VPFSROOT instead.
294 if (ip->obj_id == HAMMER_OBJID_ROOT &&
295 ip->obj_asof == hmp->asof) {
296 if (ip->obj_localization == 0)
299 vp->v_flag |= VPFSROOT;
302 vp->v_data = (void *)ip;
303 /* vnode locked by getnewvnode() */
304 /* make related vnode dirty if inode dirty? */
305 hammer_unlock(&ip->lock);
306 if (vp->v_type == VREG)
307 vinitvmio(vp, ip->ino_data.size);
312 * loop if the vget fails (aka races), or if the vp
313 * no longer matches ip->vp.
315 if (vget(vp, LK_EXCLUSIVE) == 0) {
326 * Locate all copies of the inode for obj_id compatible with the specified
327 * asof, reference, and issue the related call-back. This routine is used
328 * for direct-io invalidation and does not create any new inodes.
331 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo,
332 int (*callback)(hammer_inode_t ip, void *data),
335 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root,
336 hammer_inode_info_cmp_all_history,
341 * Acquire a HAMMER inode. The returned inode is not locked. These functions
342 * do not attach or detach the related vnode (use hammer_get_vnode() for
345 * The flags argument is only applied for newly created inodes, and only
346 * certain flags are inherited.
348 * Called from the frontend.
350 struct hammer_inode *
351 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip,
352 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
353 int flags, int *errorp)
355 hammer_mount_t hmp = trans->hmp;
356 struct hammer_node_cache *cachep;
357 struct hammer_inode_info iinfo;
358 struct hammer_cursor cursor;
359 struct hammer_inode *ip;
363 * Determine if we already have an inode cached. If we do then
366 * If we find an inode with no vnode we have to mark the
367 * transaction such that hammer_inode_waitreclaims() is
368 * called later on to avoid building up an infinite number
369 * of inodes. Otherwise we can continue to * add new inodes
370 * faster then they can be disposed of, even with the tsleep
373 * If we find a dummy inode we return a failure so dounlink
374 * (which does another lookup) doesn't try to mess with the
375 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode()
376 * to ref dummy inodes.
378 iinfo.obj_id = obj_id;
379 iinfo.obj_asof = asof;
380 iinfo.obj_localization = localization;
382 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
384 if (ip->flags & HAMMER_INODE_DUMMY) {
388 hammer_ref(&ip->lock);
394 * Allocate a new inode structure and deal with races later.
396 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
397 ++hammer_count_inodes;
400 ip->obj_asof = iinfo.obj_asof;
401 ip->obj_localization = localization;
403 ip->flags = flags & HAMMER_INODE_RO;
404 ip->cache[0].ip = ip;
405 ip->cache[1].ip = ip;
406 ip->cache[2].ip = ip;
407 ip->cache[3].ip = ip;
409 ip->flags |= HAMMER_INODE_RO;
410 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
411 0x7FFFFFFFFFFFFFFFLL;
412 RB_INIT(&ip->rec_tree);
413 TAILQ_INIT(&ip->target_list);
414 hammer_ref(&ip->lock);
417 * Locate the on-disk inode. If this is a PFS root we always
418 * access the current version of the root inode and (if it is not
419 * a master) always access information under it with a snapshot
422 * We cache recent inode lookups in this directory in dip->cache[2].
423 * If we can't find it we assume the inode we are looking for is
424 * close to the directory inode.
429 if (dip->cache[2].node)
430 cachep = &dip->cache[2];
432 cachep = &dip->cache[0];
434 hammer_init_cursor(trans, &cursor, cachep, NULL);
435 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE;
436 cursor.key_beg.obj_id = ip->obj_id;
437 cursor.key_beg.key = 0;
438 cursor.key_beg.create_tid = 0;
439 cursor.key_beg.delete_tid = 0;
440 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
441 cursor.key_beg.obj_type = 0;
443 cursor.asof = iinfo.obj_asof;
444 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA |
447 *errorp = hammer_btree_lookup(&cursor);
448 if (*errorp == EDEADLK) {
449 hammer_done_cursor(&cursor);
454 * On success the B-Tree lookup will hold the appropriate
455 * buffer cache buffers and provide a pointer to the requested
456 * information. Copy the information to the in-memory inode
457 * and cache the B-Tree node to improve future operations.
460 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
461 ip->ino_data = cursor.data->inode;
464 * cache[0] tries to cache the location of the object inode.
465 * The assumption is that it is near the directory inode.
467 * cache[1] tries to cache the location of the object data.
468 * We might have something in the governing directory from
469 * scan optimizations (see the strategy code in
472 * We update dip->cache[2], if possible, with the location
473 * of the object inode for future directory shortcuts.
475 hammer_cache_node(&ip->cache[0], cursor.node);
477 if (dip->cache[3].node) {
478 hammer_cache_node(&ip->cache[1],
481 hammer_cache_node(&dip->cache[2], cursor.node);
485 * The file should not contain any data past the file size
486 * stored in the inode. Setting save_trunc_off to the
487 * file size instead of max reduces B-Tree lookup overheads
488 * on append by allowing the flusher to avoid checking for
491 ip->save_trunc_off = ip->ino_data.size;
494 * Locate and assign the pseudofs management structure to
497 if (dip && dip->obj_localization == ip->obj_localization) {
498 ip->pfsm = dip->pfsm;
499 hammer_ref(&ip->pfsm->lock);
501 ip->pfsm = hammer_load_pseudofs(trans,
502 ip->obj_localization,
504 *errorp = 0; /* ignore ENOENT */
509 * The inode is placed on the red-black tree and will be synced to
510 * the media when flushed or by the filesystem sync. If this races
511 * another instantiation/lookup the insertion will fail.
514 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
515 hammer_free_inode(ip);
516 hammer_done_cursor(&cursor);
519 ip->flags |= HAMMER_INODE_ONDISK;
521 if (ip->flags & HAMMER_INODE_RSV_INODES) {
522 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
526 hammer_free_inode(ip);
529 hammer_done_cursor(&cursor);
530 trans->flags |= HAMMER_TRANSF_NEWINODE;
535 * Get a dummy inode to placemark a broken directory entry.
537 struct hammer_inode *
538 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip,
539 int64_t obj_id, hammer_tid_t asof, u_int32_t localization,
540 int flags, int *errorp)
542 hammer_mount_t hmp = trans->hmp;
543 struct hammer_inode_info iinfo;
544 struct hammer_inode *ip;
547 * Determine if we already have an inode cached. If we do then
550 * If we find an inode with no vnode we have to mark the
551 * transaction such that hammer_inode_waitreclaims() is
552 * called later on to avoid building up an infinite number
553 * of inodes. Otherwise we can continue to * add new inodes
554 * faster then they can be disposed of, even with the tsleep
557 * If we find a non-fake inode we return an error. Only fake
558 * inodes can be returned by this routine.
560 iinfo.obj_id = obj_id;
561 iinfo.obj_asof = asof;
562 iinfo.obj_localization = localization;
565 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
567 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) {
571 hammer_ref(&ip->lock);
576 * Allocate a new inode structure and deal with races later.
578 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
579 ++hammer_count_inodes;
582 ip->obj_asof = iinfo.obj_asof;
583 ip->obj_localization = localization;
585 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY;
586 ip->cache[0].ip = ip;
587 ip->cache[1].ip = ip;
588 ip->cache[2].ip = ip;
589 ip->cache[3].ip = ip;
590 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
591 0x7FFFFFFFFFFFFFFFLL;
592 RB_INIT(&ip->rec_tree);
593 TAILQ_INIT(&ip->target_list);
594 hammer_ref(&ip->lock);
597 * Populate the dummy inode. Leave everything zero'd out.
599 * (ip->ino_leaf and ip->ino_data)
601 * Make the dummy inode a FIFO object which most copy programs
602 * will properly ignore.
604 ip->save_trunc_off = ip->ino_data.size;
605 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO;
608 * Locate and assign the pseudofs management structure to
611 if (dip && dip->obj_localization == ip->obj_localization) {
612 ip->pfsm = dip->pfsm;
613 hammer_ref(&ip->pfsm->lock);
615 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization,
617 *errorp = 0; /* ignore ENOENT */
621 * The inode is placed on the red-black tree and will be synced to
622 * the media when flushed or by the filesystem sync. If this races
623 * another instantiation/lookup the insertion will fail.
625 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake.
628 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
629 hammer_free_inode(ip);
633 if (ip->flags & HAMMER_INODE_RSV_INODES) {
634 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
637 hammer_free_inode(ip);
640 trans->flags |= HAMMER_TRANSF_NEWINODE;
645 * Return a referenced inode only if it is in our inode cache.
647 * Dummy inodes do not count.
649 struct hammer_inode *
650 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id,
651 hammer_tid_t asof, u_int32_t localization)
653 hammer_mount_t hmp = trans->hmp;
654 struct hammer_inode_info iinfo;
655 struct hammer_inode *ip;
657 iinfo.obj_id = obj_id;
658 iinfo.obj_asof = asof;
659 iinfo.obj_localization = localization;
661 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
663 if (ip->flags & HAMMER_INODE_DUMMY)
666 hammer_ref(&ip->lock);
672 * Create a new filesystem object, returning the inode in *ipp. The
673 * returned inode will be referenced. The inode is created in-memory.
675 * If pfsm is non-NULL the caller wishes to create the root inode for
679 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
681 hammer_inode_t dip, const char *name, int namelen,
682 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp)
693 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
694 ++hammer_count_inodes;
696 trans->flags |= HAMMER_TRANSF_NEWINODE;
699 KKASSERT(pfsm->localization != 0);
700 ip->obj_id = HAMMER_OBJID_ROOT;
701 ip->obj_localization = pfsm->localization;
703 KKASSERT(dip != NULL);
704 namekey = hammer_directory_namekey(dip, name, namelen, &dummy);
705 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey);
706 ip->obj_localization = dip->obj_localization;
709 KKASSERT(ip->obj_id != 0);
710 ip->obj_asof = hmp->asof;
712 ip->flush_state = HAMMER_FST_IDLE;
713 ip->flags = HAMMER_INODE_DDIRTY |
714 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME;
715 ip->cache[0].ip = ip;
716 ip->cache[1].ip = ip;
717 ip->cache[2].ip = ip;
718 ip->cache[3].ip = ip;
720 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
721 /* ip->save_trunc_off = 0; (already zero) */
722 RB_INIT(&ip->rec_tree);
723 TAILQ_INIT(&ip->target_list);
725 ip->ino_data.atime = trans->time;
726 ip->ino_data.mtime = trans->time;
727 ip->ino_data.size = 0;
728 ip->ino_data.nlinks = 0;
731 * A nohistory designator on the parent directory is inherited by
732 * the child. We will do this even for pseudo-fs creation... the
733 * sysad can turn it off.
736 ip->ino_data.uflags = dip->ino_data.uflags &
737 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
740 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
741 ip->ino_leaf.base.localization = ip->obj_localization +
742 HAMMER_LOCALIZE_INODE;
743 ip->ino_leaf.base.obj_id = ip->obj_id;
744 ip->ino_leaf.base.key = 0;
745 ip->ino_leaf.base.create_tid = 0;
746 ip->ino_leaf.base.delete_tid = 0;
747 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
748 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
750 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
751 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
752 ip->ino_data.mode = vap->va_mode;
753 ip->ino_data.ctime = trans->time;
756 * If we are running version 2 or greater directory entries are
757 * inode-localized instead of data-localized.
759 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) {
760 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
761 ip->ino_data.cap_flags |=
762 HAMMER_INODE_CAP_DIR_LOCAL_INO;
767 * Setup the ".." pointer. This only needs to be done for directories
768 * but we do it for all objects as a recovery aid.
771 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id;
774 * The parent_obj_localization field only applies to pseudo-fs roots.
775 * XXX this is no longer applicable, PFSs are no longer directly
776 * tied into the parent's directory structure.
778 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY &&
779 ip->obj_id == HAMMER_OBJID_ROOT) {
780 ip->ino_data.ext.obj.parent_obj_localization =
781 dip->obj_localization;
785 switch(ip->ino_leaf.base.obj_type) {
786 case HAMMER_OBJTYPE_CDEV:
787 case HAMMER_OBJTYPE_BDEV:
788 ip->ino_data.rmajor = vap->va_rmajor;
789 ip->ino_data.rminor = vap->va_rminor;
796 * Calculate default uid/gid and overwrite with information from
800 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
801 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode,
802 xuid, cred, &vap->va_mode);
806 ip->ino_data.mode = vap->va_mode;
808 if (vap->va_vaflags & VA_UID_UUID_VALID)
809 ip->ino_data.uid = vap->va_uid_uuid;
810 else if (vap->va_uid != (uid_t)VNOVAL)
811 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
813 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
815 if (vap->va_vaflags & VA_GID_UUID_VALID)
816 ip->ino_data.gid = vap->va_gid_uuid;
817 else if (vap->va_gid != (gid_t)VNOVAL)
818 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
820 ip->ino_data.gid = dip->ino_data.gid;
822 hammer_ref(&ip->lock);
826 hammer_ref(&pfsm->lock);
828 } else if (dip->obj_localization == ip->obj_localization) {
829 ip->pfsm = dip->pfsm;
830 hammer_ref(&ip->pfsm->lock);
833 ip->pfsm = hammer_load_pseudofs(trans,
834 ip->obj_localization,
836 error = 0; /* ignore ENOENT */
840 hammer_free_inode(ip);
842 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
843 panic("hammer_create_inode: duplicate obj_id %llx",
844 (long long)ip->obj_id);
846 hammer_free_inode(ip);
853 * Final cleanup / freeing of an inode structure
856 hammer_free_inode(hammer_inode_t ip)
858 struct hammer_mount *hmp;
861 KKASSERT(ip->lock.refs == 1);
862 hammer_uncache_node(&ip->cache[0]);
863 hammer_uncache_node(&ip->cache[1]);
864 hammer_uncache_node(&ip->cache[2]);
865 hammer_uncache_node(&ip->cache[3]);
866 hammer_inode_wakereclaims(ip);
868 hammer_clear_objid(ip);
869 --hammer_count_inodes;
872 hammer_rel_pseudofs(hmp, ip->pfsm);
875 kfree(ip, hmp->m_inodes);
880 * Retrieve pseudo-fs data. NULL will never be returned.
882 * If an error occurs *errorp will be set and a default template is returned,
883 * otherwise *errorp is set to 0. Typically when an error occurs it will
886 hammer_pseudofs_inmem_t
887 hammer_load_pseudofs(hammer_transaction_t trans,
888 u_int32_t localization, int *errorp)
890 hammer_mount_t hmp = trans->hmp;
892 hammer_pseudofs_inmem_t pfsm;
893 struct hammer_cursor cursor;
897 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization);
899 hammer_ref(&pfsm->lock);
905 * PFS records are stored in the root inode (not the PFS root inode,
906 * but the real root). Avoid an infinite recursion if loading
907 * the PFS for the real root.
910 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT,
912 HAMMER_DEF_LOCALIZATION, 0, errorp);
917 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO);
918 pfsm->localization = localization;
919 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid;
920 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid;
922 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip);
923 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION +
924 HAMMER_LOCALIZE_MISC;
925 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
926 cursor.key_beg.create_tid = 0;
927 cursor.key_beg.delete_tid = 0;
928 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
929 cursor.key_beg.obj_type = 0;
930 cursor.key_beg.key = localization;
931 cursor.asof = HAMMER_MAX_TID;
932 cursor.flags |= HAMMER_CURSOR_ASOF;
935 *errorp = hammer_ip_lookup(&cursor);
937 *errorp = hammer_btree_lookup(&cursor);
939 *errorp = hammer_ip_resolve_data(&cursor);
941 if (cursor.data->pfsd.mirror_flags &
942 HAMMER_PFSD_DELETED) {
945 bytes = cursor.leaf->data_len;
946 if (bytes > sizeof(pfsm->pfsd))
947 bytes = sizeof(pfsm->pfsd);
948 bcopy(cursor.data, &pfsm->pfsd, bytes);
952 hammer_done_cursor(&cursor);
954 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
955 hammer_ref(&pfsm->lock);
957 hammer_rel_inode(ip, 0);
958 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) {
959 kfree(pfsm, hmp->m_misc);
966 * Store pseudo-fs data. The backend will automatically delete any prior
967 * on-disk pseudo-fs data but we have to delete in-memory versions.
970 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm)
972 struct hammer_cursor cursor;
973 hammer_record_t record;
977 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
978 HAMMER_DEF_LOCALIZATION, 0, &error);
980 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
981 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
982 cursor.key_beg.localization = ip->obj_localization +
983 HAMMER_LOCALIZE_MISC;
984 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
985 cursor.key_beg.create_tid = 0;
986 cursor.key_beg.delete_tid = 0;
987 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
988 cursor.key_beg.obj_type = 0;
989 cursor.key_beg.key = pfsm->localization;
990 cursor.asof = HAMMER_MAX_TID;
991 cursor.flags |= HAMMER_CURSOR_ASOF;
994 * Replace any in-memory version of the record.
996 error = hammer_ip_lookup(&cursor);
997 if (error == 0 && hammer_cursor_inmem(&cursor)) {
998 record = cursor.iprec;
999 if (record->flags & HAMMER_RECF_INTERLOCK_BE) {
1000 KKASSERT(cursor.deadlk_rec == NULL);
1001 hammer_ref(&record->lock);
1002 cursor.deadlk_rec = record;
1005 record->flags |= HAMMER_RECF_DELETED_FE;
1011 * Allocate replacement general record. The backend flush will
1012 * delete any on-disk version of the record.
1014 if (error == 0 || error == ENOENT) {
1015 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd));
1016 record->type = HAMMER_MEM_RECORD_GENERAL;
1018 record->leaf.base.localization = ip->obj_localization +
1019 HAMMER_LOCALIZE_MISC;
1020 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS;
1021 record->leaf.base.key = pfsm->localization;
1022 record->leaf.data_len = sizeof(pfsm->pfsd);
1023 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd));
1024 error = hammer_ip_add_record(trans, record);
1026 hammer_done_cursor(&cursor);
1027 if (error == EDEADLK)
1029 hammer_rel_inode(ip, 0);
1034 * Create a root directory for a PFS if one does not alredy exist.
1036 * The PFS root stands alone so we must also bump the nlinks count
1037 * to prevent it from being destroyed on release.
1040 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred,
1041 hammer_pseudofs_inmem_t pfsm)
1047 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1048 pfsm->localization, 0, &error);
1053 error = hammer_create_inode(trans, &vap, cred,
1057 ++ip->ino_data.nlinks;
1058 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1062 hammer_rel_inode(ip, 0);
1067 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY
1068 * if we are unable to disassociate all the inodes.
1072 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data)
1076 hammer_ref(&ip->lock);
1077 if (ip->lock.refs == 2 && ip->vp)
1078 vclean_unlocked(ip->vp);
1079 if (ip->lock.refs == 1 && ip->vp == NULL)
1082 res = -1; /* stop, someone is using the inode */
1083 hammer_rel_inode(ip, 0);
1088 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization)
1093 for (try = res = 0; try < 4; ++try) {
1094 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root,
1095 hammer_inode_pfs_cmp,
1096 hammer_unload_pseudofs_callback,
1098 if (res == 0 && try > 1)
1100 hammer_flusher_sync(trans->hmp);
1109 * Release a reference on a PFS
1112 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm)
1114 hammer_unref(&pfsm->lock);
1115 if (pfsm->lock.refs == 0) {
1116 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm);
1117 kfree(pfsm, hmp->m_misc);
1122 * Called by hammer_sync_inode().
1125 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
1127 hammer_transaction_t trans = cursor->trans;
1128 hammer_record_t record;
1136 * If the inode has a presence on-disk then locate it and mark
1137 * it deleted, setting DELONDISK.
1139 * The record may or may not be physically deleted, depending on
1140 * the retention policy.
1142 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
1143 HAMMER_INODE_ONDISK) {
1144 hammer_normalize_cursor(cursor);
1145 cursor->key_beg.localization = ip->obj_localization +
1146 HAMMER_LOCALIZE_INODE;
1147 cursor->key_beg.obj_id = ip->obj_id;
1148 cursor->key_beg.key = 0;
1149 cursor->key_beg.create_tid = 0;
1150 cursor->key_beg.delete_tid = 0;
1151 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1152 cursor->key_beg.obj_type = 0;
1153 cursor->asof = ip->obj_asof;
1154 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1155 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF;
1156 cursor->flags |= HAMMER_CURSOR_BACKEND;
1158 error = hammer_btree_lookup(cursor);
1159 if (hammer_debug_inode)
1160 kprintf("IPDEL %p %08x %d", ip, ip->flags, error);
1163 error = hammer_ip_delete_record(cursor, ip, trans->tid);
1164 if (hammer_debug_inode)
1165 kprintf(" error %d\n", error);
1167 ip->flags |= HAMMER_INODE_DELONDISK;
1170 hammer_cache_node(&ip->cache[0], cursor->node);
1172 if (error == EDEADLK) {
1173 hammer_done_cursor(cursor);
1174 error = hammer_init_cursor(trans, cursor,
1176 if (hammer_debug_inode)
1177 kprintf("IPDED %p %d\n", ip, error);
1184 * Ok, write out the initial record or a new record (after deleting
1185 * the old one), unless the DELETED flag is set. This routine will
1186 * clear DELONDISK if it writes out a record.
1188 * Update our inode statistics if this is the first application of
1189 * the inode on-disk.
1191 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
1193 * Generate a record and write it to the media. We clean-up
1194 * the state before releasing so we do not have to set-up
1197 record = hammer_alloc_mem_record(ip, 0);
1198 record->type = HAMMER_MEM_RECORD_INODE;
1199 record->flush_state = HAMMER_FST_FLUSH;
1200 record->leaf = ip->sync_ino_leaf;
1201 record->leaf.base.create_tid = trans->tid;
1202 record->leaf.data_len = sizeof(ip->sync_ino_data);
1203 record->leaf.create_ts = trans->time32;
1204 record->data = (void *)&ip->sync_ino_data;
1205 record->flags |= HAMMER_RECF_INTERLOCK_BE;
1208 * If this flag is set we cannot sync the new file size
1209 * because we haven't finished related truncations. The
1210 * inode will be flushed in another flush group to finish
1213 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) &&
1214 ip->sync_ino_data.size != ip->ino_data.size) {
1216 ip->sync_ino_data.size = ip->ino_data.size;
1222 error = hammer_ip_sync_record_cursor(cursor, record);
1223 if (hammer_debug_inode)
1224 kprintf("GENREC %p rec %08x %d\n",
1225 ip, record->flags, error);
1226 if (error != EDEADLK)
1228 hammer_done_cursor(cursor);
1229 error = hammer_init_cursor(trans, cursor,
1231 if (hammer_debug_inode)
1232 kprintf("GENREC reinit %d\n", error);
1238 * Note: The record was never on the inode's record tree
1239 * so just wave our hands importantly and destroy it.
1241 record->flags |= HAMMER_RECF_COMMITTED;
1242 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
1243 record->flush_state = HAMMER_FST_IDLE;
1244 ++ip->rec_generation;
1245 hammer_rel_mem_record(record);
1251 if (hammer_debug_inode)
1252 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
1253 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1254 HAMMER_INODE_ATIME |
1255 HAMMER_INODE_MTIME);
1256 ip->flags &= ~HAMMER_INODE_DELONDISK;
1258 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1261 * Root volume count of inodes
1263 hammer_sync_lock_sh(trans);
1264 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
1265 hammer_modify_volume_field(trans,
1268 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
1269 hammer_modify_volume_done(trans->rootvol);
1270 ip->flags |= HAMMER_INODE_ONDISK;
1271 if (hammer_debug_inode)
1272 kprintf("NOWONDISK %p\n", ip);
1274 hammer_sync_unlock(trans);
1279 * If the inode has been destroyed, clean out any left-over flags
1280 * that may have been set by the frontend.
1282 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
1283 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1284 HAMMER_INODE_ATIME |
1285 HAMMER_INODE_MTIME);
1291 * Update only the itimes fields.
1293 * ATIME can be updated without generating any UNDO. MTIME is updated
1294 * with UNDO so it is guaranteed to be synchronized properly in case of
1297 * Neither field is included in the B-Tree leaf element's CRC, which is how
1298 * we can get away with updating ATIME the way we do.
1301 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
1303 hammer_transaction_t trans = cursor->trans;
1307 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) !=
1308 HAMMER_INODE_ONDISK) {
1312 hammer_normalize_cursor(cursor);
1313 cursor->key_beg.localization = ip->obj_localization +
1314 HAMMER_LOCALIZE_INODE;
1315 cursor->key_beg.obj_id = ip->obj_id;
1316 cursor->key_beg.key = 0;
1317 cursor->key_beg.create_tid = 0;
1318 cursor->key_beg.delete_tid = 0;
1319 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1320 cursor->key_beg.obj_type = 0;
1321 cursor->asof = ip->obj_asof;
1322 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1323 cursor->flags |= HAMMER_CURSOR_ASOF;
1324 cursor->flags |= HAMMER_CURSOR_GET_LEAF;
1325 cursor->flags |= HAMMER_CURSOR_GET_DATA;
1326 cursor->flags |= HAMMER_CURSOR_BACKEND;
1328 error = hammer_btree_lookup(cursor);
1330 hammer_cache_node(&ip->cache[0], cursor->node);
1331 if (ip->sync_flags & HAMMER_INODE_MTIME) {
1333 * Updating MTIME requires an UNDO. Just cover
1334 * both atime and mtime.
1336 hammer_sync_lock_sh(trans);
1337 hammer_modify_buffer(trans, cursor->data_buffer,
1338 HAMMER_ITIMES_BASE(&cursor->data->inode),
1339 HAMMER_ITIMES_BYTES);
1340 cursor->data->inode.atime = ip->sync_ino_data.atime;
1341 cursor->data->inode.mtime = ip->sync_ino_data.mtime;
1342 hammer_modify_buffer_done(cursor->data_buffer);
1343 hammer_sync_unlock(trans);
1344 } else if (ip->sync_flags & HAMMER_INODE_ATIME) {
1346 * Updating atime only can be done in-place with
1349 hammer_sync_lock_sh(trans);
1350 hammer_modify_buffer(trans, cursor->data_buffer,
1352 cursor->data->inode.atime = ip->sync_ino_data.atime;
1353 hammer_modify_buffer_done(cursor->data_buffer);
1354 hammer_sync_unlock(trans);
1356 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME);
1358 if (error == EDEADLK) {
1359 hammer_done_cursor(cursor);
1360 error = hammer_init_cursor(trans, cursor,
1369 * Release a reference on an inode, flush as requested.
1371 * On the last reference we queue the inode to the flusher for its final
1375 hammer_rel_inode(struct hammer_inode *ip, int flush)
1377 /*hammer_mount_t hmp = ip->hmp;*/
1380 * Handle disposition when dropping the last ref.
1383 if (ip->lock.refs == 1) {
1385 * Determine whether on-disk action is needed for
1386 * the inode's final disposition.
1388 KKASSERT(ip->vp == NULL);
1389 hammer_inode_unloadable_check(ip, 0);
1390 if (ip->flags & HAMMER_INODE_MODMASK) {
1391 hammer_flush_inode(ip, 0);
1392 } else if (ip->lock.refs == 1) {
1393 hammer_unload_inode(ip);
1398 hammer_flush_inode(ip, 0);
1401 * The inode still has multiple refs, try to drop
1404 KKASSERT(ip->lock.refs >= 1);
1405 if (ip->lock.refs > 1) {
1406 hammer_unref(&ip->lock);
1414 * Unload and destroy the specified inode. Must be called with one remaining
1415 * reference. The reference is disposed of.
1417 * The inode must be completely clean.
1420 hammer_unload_inode(struct hammer_inode *ip)
1422 hammer_mount_t hmp = ip->hmp;
1424 KASSERT(ip->lock.refs == 1,
1425 ("hammer_unload_inode: %d refs\n", ip->lock.refs));
1426 KKASSERT(ip->vp == NULL);
1427 KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
1428 KKASSERT(ip->cursor_ip_refs == 0);
1429 KKASSERT(hammer_notlocked(&ip->lock));
1430 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
1432 KKASSERT(RB_EMPTY(&ip->rec_tree));
1433 KKASSERT(TAILQ_EMPTY(&ip->target_list));
1435 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
1437 hammer_free_inode(ip);
1442 * Called during unmounting if a critical error occured. The in-memory
1443 * inode and all related structures are destroyed.
1445 * If a critical error did not occur the unmount code calls the standard
1446 * release and asserts that the inode is gone.
1449 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused)
1451 hammer_record_t rec;
1454 * Get rid of the inodes in-memory records, regardless of their
1455 * state, and clear the mod-mask.
1457 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) {
1458 TAILQ_REMOVE(&ip->target_list, rec, target_entry);
1459 rec->target_ip = NULL;
1460 if (rec->flush_state == HAMMER_FST_SETUP)
1461 rec->flush_state = HAMMER_FST_IDLE;
1463 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) {
1464 if (rec->flush_state == HAMMER_FST_FLUSH)
1465 --rec->flush_group->refs;
1467 hammer_ref(&rec->lock);
1468 KKASSERT(rec->lock.refs == 1);
1469 rec->flush_state = HAMMER_FST_IDLE;
1470 rec->flush_group = NULL;
1471 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */
1472 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */
1473 ++ip->rec_generation;
1474 hammer_rel_mem_record(rec);
1476 ip->flags &= ~HAMMER_INODE_MODMASK;
1477 ip->sync_flags &= ~HAMMER_INODE_MODMASK;
1478 KKASSERT(ip->vp == NULL);
1481 * Remove the inode from any flush group, force it idle. FLUSH
1482 * and SETUP states have an inode ref.
1484 switch(ip->flush_state) {
1485 case HAMMER_FST_FLUSH:
1486 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
1487 --ip->flush_group->refs;
1488 ip->flush_group = NULL;
1490 case HAMMER_FST_SETUP:
1491 hammer_unref(&ip->lock);
1492 ip->flush_state = HAMMER_FST_IDLE;
1494 case HAMMER_FST_IDLE:
1499 * There shouldn't be any associated vnode. The unload needs at
1500 * least one ref, if we do have a vp steal its ip ref.
1503 kprintf("hammer_destroy_inode_callback: Unexpected "
1504 "vnode association ip %p vp %p\n", ip, ip->vp);
1505 ip->vp->v_data = NULL;
1508 hammer_ref(&ip->lock);
1510 hammer_unload_inode(ip);
1515 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1516 * the read-only flag for cached inodes.
1518 * This routine is called from a RB_SCAN().
1521 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
1523 hammer_mount_t hmp = ip->hmp;
1525 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
1526 ip->flags |= HAMMER_INODE_RO;
1528 ip->flags &= ~HAMMER_INODE_RO;
1533 * A transaction has modified an inode, requiring updates as specified by
1536 * HAMMER_INODE_DDIRTY: Inode data has been updated
1537 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1538 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1539 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1540 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1543 hammer_modify_inode(hammer_inode_t ip, int flags)
1546 * ronly of 0 or 2 does not trigger assertion.
1547 * 2 is a special error state
1549 KKASSERT(ip->hmp->ronly != 1 ||
1550 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
1551 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED |
1552 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0);
1553 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
1554 ip->flags |= HAMMER_INODE_RSV_INODES;
1555 ++ip->hmp->rsv_inodes;
1562 * Request that an inode be flushed. This whole mess cannot block and may
1563 * recurse (if not synchronous). Once requested HAMMER will attempt to
1564 * actively flush the inode until the flush can be done.
1566 * The inode may already be flushing, or may be in a setup state. We can
1567 * place the inode in a flushing state if it is currently idle and flag it
1568 * to reflush if it is currently flushing.
1570 * Upon return if the inode could not be flushed due to a setup
1571 * dependancy, then it will be automatically flushed when the dependancy
1575 hammer_flush_inode(hammer_inode_t ip, int flags)
1578 hammer_flush_group_t flg;
1582 * next_flush_group is the first flush group we can place the inode
1583 * in. It may be NULL. If it becomes full we append a new flush
1584 * group and make that the next_flush_group.
1587 while ((flg = hmp->next_flush_group) != NULL) {
1588 KKASSERT(flg->running == 0);
1589 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit)
1591 hmp->next_flush_group = TAILQ_NEXT(flg, flush_entry);
1592 hammer_flusher_async(ip->hmp, flg);
1595 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO);
1596 hmp->next_flush_group = flg;
1597 RB_INIT(&flg->flush_tree);
1598 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry);
1602 * Trivial 'nothing to flush' case. If the inode is in a SETUP
1603 * state we have to put it back into an IDLE state so we can
1604 * drop the extra ref.
1606 * If we have a parent dependancy we must still fall through
1609 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
1610 if (ip->flush_state == HAMMER_FST_SETUP &&
1611 TAILQ_EMPTY(&ip->target_list)) {
1612 ip->flush_state = HAMMER_FST_IDLE;
1613 hammer_rel_inode(ip, 0);
1615 if (ip->flush_state == HAMMER_FST_IDLE)
1620 * Our flush action will depend on the current state.
1622 switch(ip->flush_state) {
1623 case HAMMER_FST_IDLE:
1625 * We have no dependancies and can flush immediately. Some
1626 * our children may not be flushable so we have to re-test
1627 * with that additional knowledge.
1629 hammer_flush_inode_core(ip, flg, flags);
1631 case HAMMER_FST_SETUP:
1633 * Recurse upwards through dependancies via target_list
1634 * and start their flusher actions going if possible.
1636 * 'good' is our connectivity. -1 means we have none and
1637 * can't flush, 0 means there weren't any dependancies, and
1638 * 1 means we have good connectivity.
1640 good = hammer_setup_parent_inodes(ip, 0, flg);
1644 * We can continue if good >= 0. Determine how
1645 * many records under our inode can be flushed (and
1648 hammer_flush_inode_core(ip, flg, flags);
1651 * Parent has no connectivity, tell it to flush
1652 * us as soon as it does.
1654 * The REFLUSH flag is also needed to trigger
1655 * dependancy wakeups.
1657 ip->flags |= HAMMER_INODE_CONN_DOWN |
1658 HAMMER_INODE_REFLUSH;
1659 if (flags & HAMMER_FLUSH_SIGNAL) {
1660 ip->flags |= HAMMER_INODE_RESIGNAL;
1661 hammer_flusher_async(ip->hmp, flg);
1665 case HAMMER_FST_FLUSH:
1667 * We are already flushing, flag the inode to reflush
1668 * if needed after it completes its current flush.
1670 * The REFLUSH flag is also needed to trigger
1671 * dependancy wakeups.
1673 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
1674 ip->flags |= HAMMER_INODE_REFLUSH;
1675 if (flags & HAMMER_FLUSH_SIGNAL) {
1676 ip->flags |= HAMMER_INODE_RESIGNAL;
1677 hammer_flusher_async(ip->hmp, flg);
1684 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1685 * ip which reference our ip.
1687 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1688 * so for now do not ref/deref the structures. Note that if we use the
1689 * ref/rel code later, the rel CAN block.
1692 hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
1693 hammer_flush_group_t flg)
1695 hammer_record_t depend;
1700 * If we hit our recursion limit and we have parent dependencies
1701 * We cannot continue. Returning < 0 will cause us to be flagged
1702 * for reflush. Returning -2 cuts off additional dependency checks
1703 * because they are likely to also hit the depth limit.
1705 * We cannot return < 0 if there are no dependencies or there might
1706 * not be anything to wakeup (ip).
1708 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) {
1709 kprintf("HAMMER Warning: depth limit reached on "
1710 "setup recursion, inode %p %016llx\n",
1711 ip, (long long)ip->obj_id);
1719 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
1720 r = hammer_setup_parent_inodes_helper(depend, depth, flg);
1721 KKASSERT(depend->target_ip == ip);
1722 if (r < 0 && good == 0)
1728 * If we failed due to the recursion depth limit then stop
1738 * This helper function takes a record representing the dependancy between
1739 * the parent inode and child inode.
1741 * record->ip = parent inode
1742 * record->target_ip = child inode
1744 * We are asked to recurse upwards and convert the record from SETUP
1745 * to FLUSH if possible.
1747 * Return 1 if the record gives us connectivity
1749 * Return 0 if the record is not relevant
1751 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1754 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth,
1755 hammer_flush_group_t flg)
1761 KKASSERT(record->flush_state != HAMMER_FST_IDLE);
1766 * If the record is already flushing, is it in our flush group?
1768 * If it is in our flush group but it is a general record or a
1769 * delete-on-disk, it does not improve our connectivity (return 0),
1770 * and if the target inode is not trying to destroy itself we can't
1771 * allow the operation yet anyway (the second return -1).
1773 if (record->flush_state == HAMMER_FST_FLUSH) {
1775 * If not in our flush group ask the parent to reflush
1776 * us as soon as possible.
1778 if (record->flush_group != flg) {
1779 pip->flags |= HAMMER_INODE_REFLUSH;
1780 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1785 * If in our flush group everything is already set up,
1786 * just return whether the record will improve our
1787 * visibility or not.
1789 if (record->type == HAMMER_MEM_RECORD_ADD)
1795 * It must be a setup record. Try to resolve the setup dependancies
1796 * by recursing upwards so we can place ip on the flush list.
1798 * Limit ourselves to 20 levels of recursion to avoid blowing out
1799 * the kernel stack. If we hit the recursion limit we can't flush
1800 * until the parent flushes. The parent will flush independantly
1801 * on its own and ultimately a deep recursion will be resolved.
1803 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1805 good = hammer_setup_parent_inodes(pip, depth + 1, flg);
1808 * If good < 0 the parent has no connectivity and we cannot safely
1809 * flush the directory entry, which also means we can't flush our
1810 * ip. Flag us for downward recursion once the parent's
1811 * connectivity is resolved. Flag the parent for [re]flush or it
1812 * may not check for downward recursions.
1815 pip->flags |= HAMMER_INODE_REFLUSH;
1816 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1821 * We are go, place the parent inode in a flushing state so we can
1822 * place its record in a flushing state. Note that the parent
1823 * may already be flushing. The record must be in the same flush
1824 * group as the parent.
1826 if (pip->flush_state != HAMMER_FST_FLUSH)
1827 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION);
1828 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH);
1829 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1832 if (record->type == HAMMER_MEM_RECORD_DEL &&
1833 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
1835 * Regardless of flushing state we cannot sync this path if the
1836 * record represents a delete-on-disk but the target inode
1837 * is not ready to sync its own deletion.
1839 * XXX need to count effective nlinks to determine whether
1840 * the flush is ok, otherwise removing a hardlink will
1841 * just leave the DEL record to rot.
1843 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
1847 if (pip->flush_group == flg) {
1849 * Because we have not calculated nlinks yet we can just
1850 * set records to the flush state if the parent is in
1851 * the same flush group as we are.
1853 record->flush_state = HAMMER_FST_FLUSH;
1854 record->flush_group = flg;
1855 ++record->flush_group->refs;
1856 hammer_ref(&record->lock);
1859 * A general directory-add contributes to our visibility.
1861 * Otherwise it is probably a directory-delete or
1862 * delete-on-disk record and does not contribute to our
1863 * visbility (but we can still flush it).
1865 if (record->type == HAMMER_MEM_RECORD_ADD)
1870 * If the parent is not in our flush group we cannot
1871 * flush this record yet, there is no visibility.
1872 * We tell the parent to reflush and mark ourselves
1873 * so the parent knows it should flush us too.
1875 pip->flags |= HAMMER_INODE_REFLUSH;
1876 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1882 * This is the core routine placing an inode into the FST_FLUSH state.
1885 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags)
1890 * Set flush state and prevent the flusher from cycling into
1891 * the next flush group. Do not place the ip on the list yet.
1892 * Inodes not in the idle state get an extra reference.
1894 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
1895 if (ip->flush_state == HAMMER_FST_IDLE)
1896 hammer_ref(&ip->lock);
1897 ip->flush_state = HAMMER_FST_FLUSH;
1898 ip->flush_group = flg;
1899 ++ip->hmp->flusher.group_lock;
1900 ++ip->hmp->count_iqueued;
1901 ++hammer_count_iqueued;
1905 * If the flush group reaches the autoflush limit we want to signal
1906 * the flusher. This is particularly important for remove()s.
1908 if (flg->total_count == hammer_autoflush)
1909 flags |= HAMMER_FLUSH_SIGNAL;
1912 * We need to be able to vfsync/truncate from the backend.
1914 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
1915 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
1916 ip->flags |= HAMMER_INODE_VHELD;
1921 * Figure out how many in-memory records we can actually flush
1922 * (not including inode meta-data, buffers, etc).
1924 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0);
1925 if (flags & HAMMER_FLUSH_RECURSION) {
1927 * If this is a upwards recursion we do not want to
1928 * recurse down again!
1932 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
1934 * No new records are added if we must complete a flush
1935 * from a previous cycle, but we do have to move the records
1936 * from the previous cycle to the current one.
1939 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1940 hammer_syncgrp_child_callback, NULL);
1946 * Normal flush, scan records and bring them into the flush.
1947 * Directory adds and deletes are usually skipped (they are
1948 * grouped with the related inode rather then with the
1951 * go_count can be negative, which means the scan aborted
1952 * due to the flush group being over-full and we should
1953 * flush what we have.
1955 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
1956 hammer_setup_child_callback, NULL);
1960 * This is a more involved test that includes go_count. If we
1961 * can't flush, flag the inode and return. If go_count is 0 we
1962 * were are unable to flush any records in our rec_tree and
1963 * must ignore the XDIRTY flag.
1965 if (go_count == 0) {
1966 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
1967 --ip->hmp->count_iqueued;
1968 --hammer_count_iqueued;
1971 ip->flush_state = HAMMER_FST_SETUP;
1972 ip->flush_group = NULL;
1973 if (ip->flags & HAMMER_INODE_VHELD) {
1974 ip->flags &= ~HAMMER_INODE_VHELD;
1979 * REFLUSH is needed to trigger dependancy wakeups
1980 * when an inode is in SETUP.
1982 ip->flags |= HAMMER_INODE_REFLUSH;
1983 if (flags & HAMMER_FLUSH_SIGNAL) {
1984 ip->flags |= HAMMER_INODE_RESIGNAL;
1985 hammer_flusher_async(ip->hmp, flg);
1987 if (--ip->hmp->flusher.group_lock == 0)
1988 wakeup(&ip->hmp->flusher.group_lock);
1994 * Snapshot the state of the inode for the backend flusher.
1996 * We continue to retain save_trunc_off even when all truncations
1997 * have been resolved as an optimization to determine if we can
1998 * skip the B-Tree lookup for overwrite deletions.
2000 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
2001 * and stays in ip->flags. Once set, it stays set until the
2002 * inode is destroyed.
2004 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2005 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0);
2006 ip->sync_trunc_off = ip->trunc_off;
2007 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL;
2008 ip->flags &= ~HAMMER_INODE_TRUNCATED;
2009 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
2012 * The save_trunc_off used to cache whether the B-Tree
2013 * holds any records past that point is not used until
2014 * after the truncation has succeeded, so we can safely
2017 if (ip->save_trunc_off > ip->sync_trunc_off)
2018 ip->save_trunc_off = ip->sync_trunc_off;
2020 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK &
2021 ~HAMMER_INODE_TRUNCATED);
2022 ip->sync_ino_leaf = ip->ino_leaf;
2023 ip->sync_ino_data = ip->ino_data;
2024 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED;
2025 #ifdef DEBUG_TRUNCATE
2026 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp)
2027 kprintf("truncateS %016llx\n", ip->sync_trunc_off);
2031 * The flusher list inherits our inode and reference.
2033 KKASSERT(flg->running == 0);
2034 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip);
2035 if (--ip->hmp->flusher.group_lock == 0)
2036 wakeup(&ip->hmp->flusher.group_lock);
2038 if (flags & HAMMER_FLUSH_SIGNAL) {
2039 hammer_flusher_async(ip->hmp, flg);
2044 * Callback for scan of ip->rec_tree. Try to include each record in our
2045 * flush. ip->flush_group has been set but the inode has not yet been
2046 * moved into a flushing state.
2048 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
2051 * We return 1 for any record placed or found in FST_FLUSH, which prevents
2052 * the caller from shortcutting the flush.
2055 hammer_setup_child_callback(hammer_record_t rec, void *data)
2057 hammer_flush_group_t flg;
2058 hammer_inode_t target_ip;
2063 * Records deleted or committed by the backend are ignored.
2064 * Note that the flush detects deleted frontend records at
2065 * multiple points to deal with races. This is just the first
2066 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot
2067 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it
2068 * messes up link-count calculations.
2070 * NOTE: Don't get confused between record deletion and, say,
2071 * directory entry deletion. The deletion of a directory entry
2072 * which is on-media has nothing to do with the record deletion
2075 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE |
2076 HAMMER_RECF_COMMITTED)) {
2077 if (rec->flush_state == HAMMER_FST_FLUSH) {
2078 KKASSERT(rec->flush_group == rec->ip->flush_group);
2087 * If the record is in an idle state it has no dependancies and
2091 flg = ip->flush_group;
2094 switch(rec->flush_state) {
2095 case HAMMER_FST_IDLE:
2097 * The record has no setup dependancy, we can flush it.
2099 KKASSERT(rec->target_ip == NULL);
2100 rec->flush_state = HAMMER_FST_FLUSH;
2101 rec->flush_group = flg;
2103 hammer_ref(&rec->lock);
2106 case HAMMER_FST_SETUP:
2108 * The record has a setup dependancy. These are typically
2109 * directory entry adds and deletes. Such entries will be
2110 * flushed when their inodes are flushed so we do not
2111 * usually have to add them to the flush here. However,
2112 * if the target_ip has set HAMMER_INODE_CONN_DOWN then
2113 * it is asking us to flush this record (and it).
2115 target_ip = rec->target_ip;
2116 KKASSERT(target_ip != NULL);
2117 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
2120 * If the target IP is already flushing in our group
2121 * we could associate the record, but target_ip has
2122 * already synced ino_data to sync_ino_data and we
2123 * would also have to adjust nlinks. Plus there are
2124 * ordering issues for adds and deletes.
2126 * Reflush downward if this is an ADD, and upward if
2129 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
2130 if (rec->flush_state == HAMMER_MEM_RECORD_ADD)
2131 ip->flags |= HAMMER_INODE_REFLUSH;
2133 target_ip->flags |= HAMMER_INODE_REFLUSH;
2138 * Target IP is not yet flushing. This can get complex
2139 * because we have to be careful about the recursion.
2141 * Directories create an issue for us in that if a flush
2142 * of a directory is requested the expectation is to flush
2143 * any pending directory entries, but this will cause the
2144 * related inodes to recursively flush as well. We can't
2145 * really defer the operation so just get as many as we
2149 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 &&
2150 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) {
2152 * We aren't reclaiming and the target ip was not
2153 * previously prevented from flushing due to this
2154 * record dependancy. Do not flush this record.
2159 if (flg->total_count + flg->refs >
2160 ip->hmp->undo_rec_limit) {
2162 * Our flush group is over-full and we risk blowing
2163 * out the UNDO FIFO. Stop the scan, flush what we
2164 * have, then reflush the directory.
2166 * The directory may be forced through multiple
2167 * flush groups before it can be completely
2170 ip->flags |= HAMMER_INODE_RESIGNAL |
2171 HAMMER_INODE_REFLUSH;
2173 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
2175 * If the target IP is not flushing we can force
2176 * it to flush, even if it is unable to write out
2177 * any of its own records we have at least one in
2178 * hand that we CAN deal with.
2180 rec->flush_state = HAMMER_FST_FLUSH;
2181 rec->flush_group = flg;
2183 hammer_ref(&rec->lock);
2184 hammer_flush_inode_core(target_ip, flg,
2185 HAMMER_FLUSH_RECURSION);
2189 * General or delete-on-disk record.
2191 * XXX this needs help. If a delete-on-disk we could
2192 * disconnect the target. If the target has its own
2193 * dependancies they really need to be flushed.
2197 rec->flush_state = HAMMER_FST_FLUSH;
2198 rec->flush_group = flg;
2200 hammer_ref(&rec->lock);
2201 hammer_flush_inode_core(target_ip, flg,
2202 HAMMER_FLUSH_RECURSION);
2206 case HAMMER_FST_FLUSH:
2208 * The flush_group should already match.
2210 KKASSERT(rec->flush_group == flg);
2219 * This version just moves records already in a flush state to the new
2220 * flush group and that is it.
2223 hammer_syncgrp_child_callback(hammer_record_t rec, void *data)
2225 hammer_inode_t ip = rec->ip;
2227 switch(rec->flush_state) {
2228 case HAMMER_FST_FLUSH:
2229 KKASSERT(rec->flush_group == ip->flush_group);
2239 * Wait for a previously queued flush to complete.
2241 * If a critical error occured we don't try to wait.
2244 hammer_wait_inode(hammer_inode_t ip)
2246 hammer_flush_group_t flg;
2249 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) {
2250 while (ip->flush_state != HAMMER_FST_IDLE &&
2251 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) {
2252 if (ip->flush_state == HAMMER_FST_SETUP)
2253 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2254 if (ip->flush_state != HAMMER_FST_IDLE) {
2255 ip->flags |= HAMMER_INODE_FLUSHW;
2256 tsleep(&ip->flags, 0, "hmrwin", 0);
2263 * Called by the backend code when a flush has been completed.
2264 * The inode has already been removed from the flush list.
2266 * A pipelined flush can occur, in which case we must re-enter the
2267 * inode on the list and re-copy its fields.
2270 hammer_flush_inode_done(hammer_inode_t ip, int error)
2275 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
2280 * Auto-reflush if the backend could not completely flush
2281 * the inode. This fixes a case where a deferred buffer flush
2282 * could cause fsync to return early.
2284 if (ip->sync_flags & HAMMER_INODE_MODMASK)
2285 ip->flags |= HAMMER_INODE_REFLUSH;
2288 * Merge left-over flags back into the frontend and fix the state.
2289 * Incomplete truncations are retained by the backend.
2292 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED;
2293 ip->sync_flags &= HAMMER_INODE_TRUNCATED;
2296 * The backend may have adjusted nlinks, so if the adjusted nlinks
2297 * does not match the fronttend set the frontend's RDIRTY flag again.
2299 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
2300 ip->flags |= HAMMER_INODE_DDIRTY;
2303 * Fix up the dirty buffer status.
2305 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
2306 ip->flags |= HAMMER_INODE_BUFS;
2310 * Re-set the XDIRTY flag if some of the inode's in-memory records
2311 * could not be flushed.
2313 KKASSERT((RB_EMPTY(&ip->rec_tree) &&
2314 (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
2315 (!RB_EMPTY(&ip->rec_tree) &&
2316 (ip->flags & HAMMER_INODE_XDIRTY) != 0));
2319 * Do not lose track of inodes which no longer have vnode
2320 * assocations, otherwise they may never get flushed again.
2322 * The reflush flag can be set superfluously, causing extra pain
2323 * for no reason. If the inode is no longer modified it no longer
2324 * needs to be flushed.
2326 if (ip->flags & HAMMER_INODE_MODMASK) {
2328 ip->flags |= HAMMER_INODE_REFLUSH;
2330 ip->flags &= ~HAMMER_INODE_REFLUSH;
2334 * Adjust the flush state.
2336 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2338 * We were unable to flush out all our records, leave the
2339 * inode in a flush state and in the current flush group.
2340 * The flush group will be re-run.
2342 * This occurs if the UNDO block gets too full or there is
2343 * too much dirty meta-data and allows the flusher to
2344 * finalize the UNDO block and then re-flush.
2346 ip->flags &= ~HAMMER_INODE_WOULDBLOCK;
2350 * Remove from the flush_group
2352 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
2353 ip->flush_group = NULL;
2356 * Clean up the vnode ref and tracking counts.
2358 if (ip->flags & HAMMER_INODE_VHELD) {
2359 ip->flags &= ~HAMMER_INODE_VHELD;
2362 --hmp->count_iqueued;
2363 --hammer_count_iqueued;
2366 * And adjust the state.
2368 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
2369 ip->flush_state = HAMMER_FST_IDLE;
2372 ip->flush_state = HAMMER_FST_SETUP;
2377 * If the frontend is waiting for a flush to complete,
2380 if (ip->flags & HAMMER_INODE_FLUSHW) {
2381 ip->flags &= ~HAMMER_INODE_FLUSHW;
2386 * If the frontend made more changes and requested another
2387 * flush, then try to get it running.
2389 * Reflushes are aborted when the inode is errored out.
2391 if (ip->flags & HAMMER_INODE_REFLUSH) {
2392 ip->flags &= ~HAMMER_INODE_REFLUSH;
2393 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2394 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2395 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2397 hammer_flush_inode(ip, 0);
2403 * If we have no parent dependancies we can clear CONN_DOWN
2405 if (TAILQ_EMPTY(&ip->target_list))
2406 ip->flags &= ~HAMMER_INODE_CONN_DOWN;
2409 * If the inode is now clean drop the space reservation.
2411 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
2412 (ip->flags & HAMMER_INODE_RSV_INODES)) {
2413 ip->flags &= ~HAMMER_INODE_RSV_INODES;
2418 hammer_rel_inode(ip, 0);
2422 * Called from hammer_sync_inode() to synchronize in-memory records
2426 hammer_sync_record_callback(hammer_record_t record, void *data)
2428 hammer_cursor_t cursor = data;
2429 hammer_transaction_t trans = cursor->trans;
2430 hammer_mount_t hmp = trans->hmp;
2434 * Skip records that do not belong to the current flush.
2436 ++hammer_stats_record_iterations;
2437 if (record->flush_state != HAMMER_FST_FLUSH)
2441 if (record->flush_group != record->ip->flush_group) {
2442 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group);
2443 if (hammer_debug_critical)
2448 KKASSERT(record->flush_group == record->ip->flush_group);
2451 * Interlock the record using the BE flag. Once BE is set the
2452 * frontend cannot change the state of FE.
2454 * NOTE: If FE is set prior to us setting BE we still sync the
2455 * record out, but the flush completion code converts it to
2456 * a delete-on-disk record instead of destroying it.
2458 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
2459 record->flags |= HAMMER_RECF_INTERLOCK_BE;
2462 * The backend has already disposed of the record.
2464 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) {
2470 * If the whole inode is being deleting all on-disk records will
2471 * be deleted very soon, we can't sync any new records to disk
2472 * because they will be deleted in the same transaction they were
2473 * created in (delete_tid == create_tid), which will assert.
2475 * XXX There may be a case with RECORD_ADD with DELETED_FE set
2476 * that we currently panic on.
2478 if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
2479 switch(record->type) {
2480 case HAMMER_MEM_RECORD_DATA:
2482 * We don't have to do anything, if the record was
2483 * committed the space will have been accounted for
2487 case HAMMER_MEM_RECORD_GENERAL:
2489 * Set deleted-by-backend flag. Do not set the
2490 * backend committed flag, because we are throwing
2493 record->flags |= HAMMER_RECF_DELETED_BE;
2494 ++record->ip->rec_generation;
2497 case HAMMER_MEM_RECORD_ADD:
2498 panic("hammer_sync_record_callback: illegal add "
2499 "during inode deletion record %p", record);
2500 break; /* NOT REACHED */
2501 case HAMMER_MEM_RECORD_INODE:
2502 panic("hammer_sync_record_callback: attempt to "
2503 "sync inode record %p?", record);
2504 break; /* NOT REACHED */
2505 case HAMMER_MEM_RECORD_DEL:
2507 * Follow through and issue the on-disk deletion
2514 * If DELETED_FE is set special handling is needed for directory
2515 * entries. Dependant pieces related to the directory entry may
2516 * have already been synced to disk. If this occurs we have to
2517 * sync the directory entry and then change the in-memory record
2518 * from an ADD to a DELETE to cover the fact that it's been
2519 * deleted by the frontend.
2521 * A directory delete covering record (MEM_RECORD_DEL) can never
2522 * be deleted by the frontend.
2524 * Any other record type (aka DATA) can be deleted by the frontend.
2525 * XXX At the moment the flusher must skip it because there may
2526 * be another data record in the flush group for the same block,
2527 * meaning that some frontend data changes can leak into the backend's
2528 * synchronization point.
2530 if (record->flags & HAMMER_RECF_DELETED_FE) {
2531 if (record->type == HAMMER_MEM_RECORD_ADD) {
2533 * Convert a front-end deleted directory-add to
2534 * a directory-delete entry later.
2536 record->flags |= HAMMER_RECF_CONVERT_DELETE;
2539 * Dispose of the record (race case). Mark as
2540 * deleted by backend (and not committed).
2542 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
2543 record->flags |= HAMMER_RECF_DELETED_BE;
2544 ++record->ip->rec_generation;
2551 * Assign the create_tid for new records. Deletions already
2552 * have the record's entire key properly set up.
2554 if (record->type != HAMMER_MEM_RECORD_DEL) {
2555 record->leaf.base.create_tid = trans->tid;
2556 record->leaf.create_ts = trans->time32;
2559 error = hammer_ip_sync_record_cursor(cursor, record);
2560 if (error != EDEADLK)
2562 hammer_done_cursor(cursor);
2563 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
2568 record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
2573 hammer_flush_record_done(record, error);
2576 * Do partial finalization if we have built up too many dirty
2577 * buffers. Otherwise a buffer cache deadlock can occur when
2578 * doing things like creating tens of thousands of tiny files.
2580 * We must release our cursor lock to avoid a 3-way deadlock
2581 * due to the exclusive sync lock the finalizer must get.
2583 * WARNING: See warnings in hammer_unlock_cursor() function.
2585 if (hammer_flusher_meta_limit(hmp)) {
2586 hammer_unlock_cursor(cursor);
2587 hammer_flusher_finalize(trans, 0);
2588 hammer_lock_cursor(cursor);
2595 * Backend function called by the flusher to sync an inode to media.
2598 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip)
2600 struct hammer_cursor cursor;
2601 hammer_node_t tmp_node;
2602 hammer_record_t depend;
2603 hammer_record_t next;
2604 int error, tmp_error;
2607 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
2610 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
2615 * Any directory records referencing this inode which are not in
2616 * our current flush group must adjust our nlink count for the
2617 * purposes of synchronization to disk.
2619 * Records which are in our flush group can be unlinked from our
2620 * inode now, potentially allowing the inode to be physically
2623 * This cannot block.
2625 nlinks = ip->ino_data.nlinks;
2626 next = TAILQ_FIRST(&ip->target_list);
2627 while ((depend = next) != NULL) {
2628 next = TAILQ_NEXT(depend, target_entry);
2629 if (depend->flush_state == HAMMER_FST_FLUSH &&
2630 depend->flush_group == ip->flush_group) {
2632 * If this is an ADD that was deleted by the frontend
2633 * the frontend nlinks count will have already been
2634 * decremented, but the backend is going to sync its
2635 * directory entry and must account for it. The
2636 * record will be converted to a delete-on-disk when
2639 * If the ADD was not deleted by the frontend we
2640 * can remove the dependancy from our target_list.
2642 if (depend->flags & HAMMER_RECF_DELETED_FE) {
2645 TAILQ_REMOVE(&ip->target_list, depend,
2647 depend->target_ip = NULL;
2649 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
2651 * Not part of our flush group and not deleted by
2652 * the front-end, adjust the link count synced to
2653 * the media (undo what the frontend did when it
2654 * queued the record).
2656 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
2657 switch(depend->type) {
2658 case HAMMER_MEM_RECORD_ADD:
2661 case HAMMER_MEM_RECORD_DEL:
2671 * Set dirty if we had to modify the link count.
2673 if (ip->sync_ino_data.nlinks != nlinks) {
2674 KKASSERT((int64_t)nlinks >= 0);
2675 ip->sync_ino_data.nlinks = nlinks;
2676 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2680 * If there is a trunction queued destroy any data past the (aligned)
2681 * truncation point. Userland will have dealt with the buffer
2682 * containing the truncation point for us.
2684 * We don't flush pending frontend data buffers until after we've
2685 * dealt with the truncation.
2687 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2689 * Interlock trunc_off. The VOP front-end may continue to
2690 * make adjustments to it while we are blocked.
2693 off_t aligned_trunc_off;
2696 trunc_off = ip->sync_trunc_off;
2697 blkmask = hammer_blocksize(trunc_off) - 1;
2698 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask;
2701 * Delete any whole blocks on-media. The front-end has
2702 * already cleaned out any partial block and made it
2703 * pending. The front-end may have updated trunc_off
2704 * while we were blocked so we only use sync_trunc_off.
2706 * This operation can blow out the buffer cache, EWOULDBLOCK
2707 * means we were unable to complete the deletion. The
2708 * deletion will update sync_trunc_off in that case.
2710 error = hammer_ip_delete_range(&cursor, ip,
2712 0x7FFFFFFFFFFFFFFFLL, 2);
2713 if (error == EWOULDBLOCK) {
2714 ip->flags |= HAMMER_INODE_WOULDBLOCK;
2716 goto defer_buffer_flush;
2723 * Clear the truncation flag on the backend after we have
2724 * complete the deletions. Backend data is now good again
2725 * (including new records we are about to sync, below).
2727 * Leave sync_trunc_off intact. As we write additional
2728 * records the backend will update sync_trunc_off. This
2729 * tells the backend whether it can skip the overwrite
2730 * test. This should work properly even when the backend
2731 * writes full blocks where the truncation point straddles
2732 * the block because the comparison is against the base
2733 * offset of the record.
2735 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2736 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */
2742 * Now sync related records. These will typically be directory
2743 * entries, records tracking direct-writes, or delete-on-disk records.
2746 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2747 hammer_sync_record_callback, &cursor);
2753 hammer_cache_node(&ip->cache[1], cursor.node);
2756 * Re-seek for inode update, assuming our cache hasn't been ripped
2757 * out from under us.
2760 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error);
2762 hammer_cursor_downgrade(&cursor);
2763 hammer_lock_sh(&tmp_node->lock);
2764 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0)
2765 hammer_cursor_seek(&cursor, tmp_node, 0);
2766 hammer_unlock(&tmp_node->lock);
2767 hammer_rel_node(tmp_node);
2773 * If we are deleting the inode the frontend had better not have
2774 * any active references on elements making up the inode.
2776 * The call to hammer_ip_delete_clean() cleans up auxillary records
2777 * but not DB or DATA records. Those must have already been deleted
2778 * by the normal truncation mechanic.
2780 if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
2781 RB_EMPTY(&ip->rec_tree) &&
2782 (ip->sync_flags & HAMMER_INODE_DELETING) &&
2783 (ip->flags & HAMMER_INODE_DELETED) == 0) {
2786 error = hammer_ip_delete_clean(&cursor, ip, &count1);
2788 ip->flags |= HAMMER_INODE_DELETED;
2789 ip->sync_flags &= ~HAMMER_INODE_DELETING;
2790 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
2791 KKASSERT(RB_EMPTY(&ip->rec_tree));
2794 * Set delete_tid in both the frontend and backend
2795 * copy of the inode record. The DELETED flag handles
2796 * this, do not set RDIRTY.
2798 ip->ino_leaf.base.delete_tid = trans->tid;
2799 ip->sync_ino_leaf.base.delete_tid = trans->tid;
2800 ip->ino_leaf.delete_ts = trans->time32;
2801 ip->sync_ino_leaf.delete_ts = trans->time32;
2805 * Adjust the inode count in the volume header
2807 hammer_sync_lock_sh(trans);
2808 if (ip->flags & HAMMER_INODE_ONDISK) {
2809 hammer_modify_volume_field(trans,
2812 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
2813 hammer_modify_volume_done(trans->rootvol);
2815 hammer_sync_unlock(trans);
2821 ip->sync_flags &= ~HAMMER_INODE_BUFS;
2825 * Now update the inode's on-disk inode-data and/or on-disk record.
2826 * DELETED and ONDISK are managed only in ip->flags.
2828 * In the case of a defered buffer flush we still update the on-disk
2829 * inode to satisfy visibility requirements if there happen to be
2830 * directory dependancies.
2832 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
2833 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
2835 * If deleted and on-disk, don't set any additional flags.
2836 * the delete flag takes care of things.
2838 * Clear flags which may have been set by the frontend.
2840 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
2841 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
2842 HAMMER_INODE_DELETING);
2844 case HAMMER_INODE_DELETED:
2846 * Take care of the case where a deleted inode was never
2847 * flushed to the disk in the first place.
2849 * Clear flags which may have been set by the frontend.
2851 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
2852 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
2853 HAMMER_INODE_DELETING);
2854 while (RB_ROOT(&ip->rec_tree)) {
2855 hammer_record_t record = RB_ROOT(&ip->rec_tree);
2856 hammer_ref(&record->lock);
2857 KKASSERT(record->lock.refs == 1);
2858 record->flags |= HAMMER_RECF_DELETED_BE;
2859 ++record->ip->rec_generation;
2860 hammer_rel_mem_record(record);
2863 case HAMMER_INODE_ONDISK:
2865 * If already on-disk, do not set any additional flags.
2870 * If not on-disk and not deleted, set DDIRTY to force
2871 * an initial record to be written.
2873 * Also set the create_tid in both the frontend and backend
2874 * copy of the inode record.
2876 ip->ino_leaf.base.create_tid = trans->tid;
2877 ip->ino_leaf.create_ts = trans->time32;
2878 ip->sync_ino_leaf.base.create_tid = trans->tid;
2879 ip->sync_ino_leaf.create_ts = trans->time32;
2880 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2885 * If RDIRTY or DDIRTY is set, write out a new record. If the inode
2886 * is already on-disk the old record is marked as deleted.
2888 * If DELETED is set hammer_update_inode() will delete the existing
2889 * record without writing out a new one.
2891 * If *ONLY* the ITIMES flag is set we can update the record in-place.
2893 if (ip->flags & HAMMER_INODE_DELETED) {
2894 error = hammer_update_inode(&cursor, ip);
2896 if ((ip->sync_flags & HAMMER_INODE_DDIRTY) == 0 &&
2897 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) {
2898 error = hammer_update_itimes(&cursor, ip);
2900 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
2901 error = hammer_update_inode(&cursor, ip);
2905 hammer_critical_error(ip->hmp, ip, error,
2906 "while syncing inode");
2908 hammer_done_cursor(&cursor);
2913 * This routine is called when the OS is no longer actively referencing
2914 * the inode (but might still be keeping it cached), or when releasing
2915 * the last reference to an inode.
2917 * At this point if the inode's nlinks count is zero we want to destroy
2918 * it, which may mean destroying it on-media too.
2921 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
2926 * Set the DELETING flag when the link count drops to 0 and the
2927 * OS no longer has any opens on the inode.
2929 * The backend will clear DELETING (a mod flag) and set DELETED
2930 * (a state flag) when it is actually able to perform the
2933 * Don't reflag the deletion if the flusher is currently syncing
2934 * one that was already flagged. A previously set DELETING flag
2935 * may bounce around flags and sync_flags until the operation is
2938 if (ip->ino_data.nlinks == 0 &&
2939 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
2940 ip->flags |= HAMMER_INODE_DELETING;
2941 ip->flags |= HAMMER_INODE_TRUNCATED;
2945 if (hammer_get_vnode(ip, &vp) != 0)
2953 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE);
2954 vnode_pager_setsize(ip->vp, 0);
2963 * After potentially resolving a dependancy the inode is tested
2964 * to determine whether it needs to be reflushed.
2967 hammer_test_inode(hammer_inode_t ip)
2969 if (ip->flags & HAMMER_INODE_REFLUSH) {
2970 ip->flags &= ~HAMMER_INODE_REFLUSH;
2971 hammer_ref(&ip->lock);
2972 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2973 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2974 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2976 hammer_flush_inode(ip, 0);
2978 hammer_rel_inode(ip, 0);
2983 * Clear the RECLAIM flag on an inode. This occurs when the inode is
2984 * reassociated with a vp or just before it gets freed.
2986 * Pipeline wakeups to threads blocked due to an excessive number of
2987 * detached inodes. This typically occurs when atime updates accumulate
2988 * while scanning a directory tree.
2991 hammer_inode_wakereclaims(hammer_inode_t ip)
2993 struct hammer_reclaim *reclaim;
2994 hammer_mount_t hmp = ip->hmp;
2996 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0)
2999 --hammer_count_reclaiming;
3000 --hmp->inode_reclaims;
3001 ip->flags &= ~HAMMER_INODE_RECLAIM;
3003 while ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) {
3004 if (reclaim->count > 0 && --reclaim->count == 0) {
3005 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry);
3008 if (hmp->inode_reclaims > hammer_limit_reclaim / 2)
3014 * Setup our reclaim pipeline. We only let so many detached (and dirty)
3015 * inodes build up before we start blocking. This routine is called
3016 * if a new inode is created or an inode is loaded from media.
3018 * When we block we don't care *which* inode has finished reclaiming,
3019 * as lone as one does.
3022 hammer_inode_waitreclaims(hammer_mount_t hmp)
3024 struct hammer_reclaim reclaim;
3026 if (hmp->inode_reclaims < hammer_limit_reclaim)
3029 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry);
3030 tsleep(&reclaim, 0, "hmrrcm", hz);
3031 if (reclaim.count > 0)
3032 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry);
3038 * XXX not used, doesn't work very well due to the large batching nature
3041 * A larger then normal backlog of inodes is sitting in the flusher,
3042 * enforce a general slowdown to let it catch up. This routine is only
3043 * called on completion of a non-flusher-related transaction which
3044 * performed B-Tree node I/O.
3046 * It is possible for the flusher to stall in a continuous load.
3047 * blogbench -i1000 -o seems to do a good job generating this sort of load.
3048 * If the flusher is unable to catch up the inode count can bloat until
3049 * we run out of kvm.
3051 * This is a bit of a hack.
3054 hammer_inode_waithard(hammer_mount_t hmp)
3059 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) {
3060 if (hmp->inode_reclaims < hammer_limit_reclaim / 2 &&
3061 hmp->count_iqueued < hmp->count_inodes / 20) {
3062 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY;
3066 if (hmp->inode_reclaims < hammer_limit_reclaim ||
3067 hmp->count_iqueued < hmp->count_inodes / 10) {
3070 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY;
3074 * Block for one flush cycle.
3076 hammer_flusher_wait_next(hmp);
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