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
35 #include <vm/vm_page2.h>
39 static int hammer_unload_inode(hammer_inode_t ip);
40 static void hammer_free_inode(hammer_inode_t ip);
41 static void hammer_flush_inode_core(hammer_inode_t ip,
42 hammer_flush_group_t flg, int flags);
43 static int hammer_setup_child_callback(hammer_record_t rec, void *data);
45 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data);
47 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
48 hammer_flush_group_t flg);
49 static int hammer_setup_parent_inodes_helper(hammer_record_t record,
50 int depth, hammer_flush_group_t flg);
51 static void hammer_inode_wakereclaims(hammer_inode_t ip);
52 static struct hammer_inostats *hammer_inode_inostats(hammer_mount_t hmp,
54 static hammer_inode_t __hammer_find_inode(hammer_transaction_t trans,
55 int64_t obj_id, hammer_tid_t asof,
56 uint32_t localization);
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 uint32_t localization = *(uint32_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, uint32_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 hammer_inode_t 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)
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(hammer_inode_t 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(hammer_inode_t 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 if (ip->obj_asof == hmp->asof) {
340 if (ip->obj_localization ==
341 HAMMER_DEF_LOCALIZATION)
342 vsetflags(vp, VROOT);
344 vsetflags(vp, VPFSROOT);
346 vsetflags(vp, VPFSROOT);
350 vp->v_data = (void *)ip;
351 /* vnode locked by getnewvnode() */
352 /* make related vnode dirty if inode dirty? */
353 hammer_unlock(&ip->lock);
354 if (vp->v_type == VREG) {
355 vinitvmio(vp, ip->ino_data.size,
356 hammer_blocksize(ip->ino_data.size),
357 hammer_blockoff(ip->ino_data.size));
363 * Interlock vnode clearing. This does not prevent the
364 * vnode from going into a reclaimed state but it does
365 * prevent it from being destroyed or reused so the vget()
366 * will properly fail.
368 hammer_lock_ex(&ip->lock);
369 if ((vp = ip->vp) == NULL) {
370 hammer_unlock(&ip->lock);
374 hammer_unlock(&ip->lock);
377 * loop if the vget fails (aka races), or if the vp
378 * no longer matches ip->vp.
380 if (vget(vp, LK_EXCLUSIVE) == 0) {
394 * Locate all copies of the inode for obj_id compatible with the specified
395 * asof, reference, and issue the related call-back. This routine is used
396 * for direct-io invalidation and does not create any new inodes.
399 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo,
400 int (*callback)(hammer_inode_t ip, void *data),
403 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root,
404 hammer_inode_info_cmp_all_history,
409 * Acquire a HAMMER inode. The returned inode is not locked. These functions
410 * do not attach or detach the related vnode (use hammer_get_vnode() for
413 * The flags argument is only applied for newly created inodes, and only
414 * certain flags are inherited.
416 * Called from the frontend.
419 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip,
420 int64_t obj_id, hammer_tid_t asof, uint32_t localization,
421 int flags, int *errorp)
423 hammer_mount_t hmp = trans->hmp;
424 struct hammer_node_cache *cachep;
425 struct hammer_cursor cursor;
430 * Determine if we already have an inode cached. If we do then
433 * If we find an inode with no vnode we have to mark the
434 * transaction such that hammer_inode_waitreclaims() is
435 * called later on to avoid building up an infinite number
436 * of inodes. Otherwise we can continue to * add new inodes
437 * faster then they can be disposed of, even with the tsleep
440 * If we find a dummy inode we return a failure so dounlink
441 * (which does another lookup) doesn't try to mess with the
442 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode()
443 * to ref dummy inodes.
447 ip = __hammer_find_inode(trans, obj_id, asof, localization);
449 if (ip->flags & HAMMER_INODE_DUMMY) {
453 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;
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 =
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;
508 cursor.flags = HAMMER_CURSOR_GET_DATA | HAMMER_CURSOR_ASOF;
510 *errorp = hammer_btree_lookup(&cursor);
511 if (*errorp == EDEADLK) {
512 hammer_done_cursor(&cursor);
517 * On success the B-Tree lookup will hold the appropriate
518 * buffer cache buffers and provide a pointer to the requested
519 * information. Copy the information to the in-memory inode
520 * and cache the B-Tree node to improve future operations.
523 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf;
524 ip->ino_data = cursor.data->inode;
527 * cache[0] tries to cache the location of the object inode.
528 * The assumption is that it is near the directory inode.
530 * cache[1] tries to cache the location of the object data.
531 * We might have something in the governing directory from
532 * scan optimizations (see the strategy code in
535 * We update dip->cache[2], if possible, with the location
536 * of the object inode for future directory shortcuts.
538 hammer_cache_node(&ip->cache[0], cursor.node);
540 if (dip->cache[3].node) {
541 hammer_cache_node(&ip->cache[1],
544 hammer_cache_node(&dip->cache[2], cursor.node);
548 * The file should not contain any data past the file size
549 * stored in the inode. Setting save_trunc_off to the
550 * file size instead of max reduces B-Tree lookup overheads
551 * on append by allowing the flusher to avoid checking for
554 ip->save_trunc_off = ip->ino_data.size;
557 * Locate and assign the pseudofs management structure to
560 if (dip && dip->obj_localization == ip->obj_localization) {
561 ip->pfsm = dip->pfsm;
562 hammer_ref(&ip->pfsm->lock);
564 ip->pfsm = hammer_load_pseudofs(trans,
565 ip->obj_localization,
567 *errorp = 0; /* ignore ENOENT */
572 * The inode is placed on the red-black tree and will be synced to
573 * the media when flushed or by the filesystem sync. If this races
574 * another instantiation/lookup the insertion will fail.
577 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
578 hammer_free_inode(ip);
579 hammer_done_cursor(&cursor);
582 ip->flags |= HAMMER_INODE_ONDISK;
584 if (ip->flags & HAMMER_INODE_RSV_INODES) {
585 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
589 hammer_free_inode(ip);
592 hammer_done_cursor(&cursor);
595 * NEWINODE is only set if the inode becomes dirty later,
596 * setting it here just leads to unnecessary stalls.
598 * trans->flags |= HAMMER_TRANSF_NEWINODE;
604 * Get a dummy inode to placemark a broken directory entry.
607 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip,
608 int64_t obj_id, hammer_tid_t asof, uint32_t localization,
609 int flags, int *errorp)
611 hammer_mount_t hmp = trans->hmp;
615 * Determine if we already have an inode cached. If we do then
618 * If we find an inode with no vnode we have to mark the
619 * transaction such that hammer_inode_waitreclaims() is
620 * called later on to avoid building up an infinite number
621 * of inodes. Otherwise we can continue to * add new inodes
622 * faster then they can be disposed of, even with the tsleep
625 * If we find a non-fake inode we return an error. Only fake
626 * inodes can be returned by this routine.
630 ip = __hammer_find_inode(trans, obj_id, asof, localization);
632 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) {
636 hammer_ref(&ip->lock);
641 * Allocate a new inode structure and deal with races later.
643 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
644 ++hammer_count_inodes;
648 ip->obj_localization = localization;
650 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY;
651 ip->cache[0].ip = ip;
652 ip->cache[1].ip = ip;
653 ip->cache[2].ip = ip;
654 ip->cache[3].ip = ip;
655 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off =
657 RB_INIT(&ip->rec_tree);
658 TAILQ_INIT(&ip->target_list);
659 hammer_ref(&ip->lock);
662 * Populate the dummy inode. Leave everything zero'd out.
664 * (ip->ino_leaf and ip->ino_data)
666 * Make the dummy inode a FIFO object which most copy programs
667 * will properly ignore.
669 ip->save_trunc_off = ip->ino_data.size;
670 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO;
673 * Locate and assign the pseudofs management structure to
676 if (dip && dip->obj_localization == ip->obj_localization) {
677 ip->pfsm = dip->pfsm;
678 hammer_ref(&ip->pfsm->lock);
680 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization,
682 *errorp = 0; /* ignore ENOENT */
686 * The inode is placed on the red-black tree and will be synced to
687 * the media when flushed or by the filesystem sync. If this races
688 * another instantiation/lookup the insertion will fail.
690 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake.
693 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
694 hammer_free_inode(ip);
698 if (ip->flags & HAMMER_INODE_RSV_INODES) {
699 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */
702 hammer_free_inode(ip);
705 trans->flags |= HAMMER_TRANSF_NEWINODE;
710 * Return a referenced inode only if it is in our inode cache.
711 * Dummy inodes do not count.
714 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id,
715 hammer_tid_t asof, uint32_t localization)
719 ip = __hammer_find_inode(trans, obj_id, asof, localization);
721 if (ip->flags & HAMMER_INODE_DUMMY)
724 hammer_ref(&ip->lock);
730 * Return a referenced inode only if it is in our inode cache.
731 * This function does not reference inode.
733 static hammer_inode_t
734 __hammer_find_inode(hammer_transaction_t trans, int64_t obj_id,
735 hammer_tid_t asof, uint32_t localization)
737 hammer_mount_t hmp = trans->hmp;
738 struct hammer_inode_info iinfo;
741 iinfo.obj_id = obj_id;
742 iinfo.obj_asof = asof;
743 iinfo.obj_localization = localization;
745 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
751 * Create a new filesystem object, returning the inode in *ipp. The
752 * returned inode will be referenced. The inode is created in-memory.
754 * If pfsm is non-NULL the caller wishes to create the root inode for
758 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
760 hammer_inode_t dip, const char *name, int namelen,
761 hammer_pseudofs_inmem_t pfsm, hammer_inode_t *ipp)
773 * Disallow the creation of new inodes in directories which
774 * have been deleted. In HAMMER, this will cause a record
775 * syncing assertion later on in the flush code.
777 if (dip && dip->ino_data.nlinks == 0) {
785 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO);
786 ++hammer_count_inodes;
788 trans->flags |= HAMMER_TRANSF_NEWINODE;
791 KKASSERT(pfsm->localization != HAMMER_DEF_LOCALIZATION);
792 ip->obj_id = HAMMER_OBJID_ROOT;
793 ip->obj_localization = pfsm->localization;
795 KKASSERT(dip != NULL);
796 namekey = hammer_direntry_namekey(dip, name, namelen, &dummy);
797 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey);
798 ip->obj_localization = dip->obj_localization;
801 KKASSERT(ip->obj_id != 0);
802 ip->obj_asof = hmp->asof;
804 ip->flush_state = HAMMER_FST_IDLE;
805 ip->flags = HAMMER_INODE_DDIRTY |
806 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME;
807 ip->cache[0].ip = ip;
808 ip->cache[1].ip = ip;
809 ip->cache[2].ip = ip;
810 ip->cache[3].ip = ip;
812 ip->trunc_off = HAMMER_MAX_KEY;
813 /* ip->save_trunc_off = 0; (already zero) */
814 RB_INIT(&ip->rec_tree);
815 TAILQ_INIT(&ip->target_list);
817 ip->ino_data.atime = trans->time;
818 ip->ino_data.mtime = trans->time;
819 ip->ino_data.size = 0;
820 ip->ino_data.nlinks = 0;
823 * A nohistory designator on the parent directory is inherited by
824 * the child. We will do this even for pseudo-fs creation... the
825 * sysad can turn it off.
828 ip->ino_data.uflags = dip->ino_data.uflags &
829 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
832 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD;
833 ip->ino_leaf.base.localization = ip->obj_localization |
834 HAMMER_LOCALIZE_INODE;
835 ip->ino_leaf.base.obj_id = ip->obj_id;
836 ip->ino_leaf.base.key = 0;
837 ip->ino_leaf.base.create_tid = 0;
838 ip->ino_leaf.base.delete_tid = 0;
839 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE;
840 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type);
842 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type;
843 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
844 ip->ino_data.mode = vap->va_mode;
845 ip->ino_data.ctime = trans->time;
848 * If we are running version 2 or greater directory entries are
849 * inode-localized instead of data-localized.
851 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) {
852 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
853 ip->ino_data.cap_flags |=
854 HAMMER_INODE_CAP_DIR_LOCAL_INO;
857 if (trans->hmp->version >= HAMMER_VOL_VERSION_SIX) {
858 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
859 ip->ino_data.cap_flags |=
860 HAMMER_INODE_CAP_DIRHASH_ALG1;
865 * Setup the ".." pointer. This only needs to be done for directories
866 * but we do it for all objects as a recovery aid if dip exists.
867 * The inode is probably a PFS root if dip is NULL.
870 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id;
872 switch(ip->ino_leaf.base.obj_type) {
873 case HAMMER_OBJTYPE_CDEV:
874 case HAMMER_OBJTYPE_BDEV:
875 ip->ino_data.rmajor = vap->va_rmajor;
876 ip->ino_data.rminor = vap->va_rminor;
883 * Calculate default uid/gid and overwrite with information from
887 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
888 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode,
889 xuid, cred, &vap->va_mode);
893 ip->ino_data.mode = vap->va_mode;
895 if (vap->va_vaflags & VA_UID_UUID_VALID)
896 ip->ino_data.uid = vap->va_uid_uuid;
897 else if (vap->va_uid != (uid_t)VNOVAL)
898 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid);
900 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
902 if (vap->va_vaflags & VA_GID_UUID_VALID)
903 ip->ino_data.gid = vap->va_gid_uuid;
904 else if (vap->va_gid != (gid_t)VNOVAL)
905 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
907 ip->ino_data.gid = dip->ino_data.gid;
909 hammer_ref(&ip->lock);
913 hammer_ref(&pfsm->lock);
915 } else if (dip->obj_localization == ip->obj_localization) {
916 ip->pfsm = dip->pfsm;
917 hammer_ref(&ip->pfsm->lock);
920 ip->pfsm = hammer_load_pseudofs(trans,
921 ip->obj_localization,
923 error = 0; /* ignore ENOENT */
927 hammer_free_inode(ip);
929 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
930 hpanic("duplicate obj_id %jx", (intmax_t)ip->obj_id);
932 hammer_free_inode(ip);
939 * Final cleanup / freeing of an inode structure
942 hammer_free_inode(hammer_inode_t ip)
947 KKASSERT(hammer_oneref(&ip->lock));
948 hammer_uncache_node(&ip->cache[0]);
949 hammer_uncache_node(&ip->cache[1]);
950 hammer_uncache_node(&ip->cache[2]);
951 hammer_uncache_node(&ip->cache[3]);
952 hammer_inode_wakereclaims(ip);
954 hammer_clear_objid(ip);
955 --hammer_count_inodes;
958 hammer_rel_pseudofs(hmp, ip->pfsm);
961 kfree(ip, hmp->m_inodes);
965 * Retrieve pseudo-fs data. NULL will never be returned.
967 * If an error occurs *errorp will be set and a default template is returned,
968 * otherwise *errorp is set to 0. Typically when an error occurs it will
971 hammer_pseudofs_inmem_t
972 hammer_load_pseudofs(hammer_transaction_t trans,
973 uint32_t localization, int *errorp)
975 hammer_mount_t hmp = trans->hmp;
977 hammer_pseudofs_inmem_t pfsm;
978 struct hammer_cursor cursor;
982 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization);
984 hammer_ref(&pfsm->lock);
990 * PFS records are associated with the root inode (not the PFS root
991 * inode, but the real root). Avoid an infinite recursion if loading
992 * the PFS for the real root.
995 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT,
997 HAMMER_DEF_LOCALIZATION, 0, errorp);
1002 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO);
1003 pfsm->localization = localization;
1004 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid;
1005 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid;
1007 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip);
1008 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION |
1009 HAMMER_LOCALIZE_MISC;
1010 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
1011 cursor.key_beg.create_tid = 0;
1012 cursor.key_beg.delete_tid = 0;
1013 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
1014 cursor.key_beg.obj_type = 0;
1015 cursor.key_beg.key = localization;
1016 cursor.asof = HAMMER_MAX_TID;
1017 cursor.flags |= HAMMER_CURSOR_ASOF;
1020 *errorp = hammer_ip_lookup(&cursor);
1022 *errorp = hammer_btree_lookup(&cursor);
1024 *errorp = hammer_ip_resolve_data(&cursor);
1026 if (hammer_is_pfs_deleted(&cursor.data->pfsd)) {
1029 bytes = cursor.leaf->data_len;
1030 if (bytes > sizeof(pfsm->pfsd))
1031 bytes = sizeof(pfsm->pfsd);
1032 bcopy(cursor.data, &pfsm->pfsd, bytes);
1036 hammer_done_cursor(&cursor);
1038 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1039 hammer_ref(&pfsm->lock);
1041 hammer_rel_inode(ip, 0);
1042 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) {
1043 kfree(pfsm, hmp->m_misc);
1050 * Store pseudo-fs data. The backend will automatically delete any prior
1051 * on-disk pseudo-fs data but we have to delete in-memory versions.
1054 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm)
1056 struct hammer_cursor cursor;
1057 hammer_record_t record;
1062 * PFS records are associated with the root inode (not the PFS root
1063 * inode, but the real root).
1065 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1066 HAMMER_DEF_LOCALIZATION, 0, &error);
1068 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid);
1069 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
1070 cursor.key_beg.localization = ip->obj_localization |
1071 HAMMER_LOCALIZE_MISC;
1072 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
1073 cursor.key_beg.create_tid = 0;
1074 cursor.key_beg.delete_tid = 0;
1075 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
1076 cursor.key_beg.obj_type = 0;
1077 cursor.key_beg.key = pfsm->localization;
1078 cursor.asof = HAMMER_MAX_TID;
1079 cursor.flags |= HAMMER_CURSOR_ASOF;
1082 * Replace any in-memory version of the record.
1084 error = hammer_ip_lookup(&cursor);
1085 if (error == 0 && hammer_cursor_inmem(&cursor)) {
1086 record = cursor.iprec;
1087 if (record->flags & HAMMER_RECF_INTERLOCK_BE) {
1088 KKASSERT(cursor.deadlk_rec == NULL);
1089 hammer_ref(&record->lock);
1090 cursor.deadlk_rec = record;
1093 record->flags |= HAMMER_RECF_DELETED_FE;
1099 * Allocate replacement general record. The backend flush will
1100 * delete any on-disk version of the record.
1102 if (error == 0 || error == ENOENT) {
1103 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd));
1104 record->type = HAMMER_MEM_RECORD_GENERAL;
1106 record->leaf.base.localization = ip->obj_localization |
1107 HAMMER_LOCALIZE_MISC;
1108 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS;
1109 record->leaf.base.key = pfsm->localization;
1110 record->leaf.data_len = sizeof(pfsm->pfsd);
1111 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd));
1112 error = hammer_ip_add_record(trans, record);
1114 hammer_done_cursor(&cursor);
1115 if (error == EDEADLK)
1117 hammer_rel_inode(ip, 0);
1122 * Create a root directory for a PFS if one does not alredy exist.
1124 * The PFS root stands alone so we must also bump the nlinks count
1125 * to prevent it from being destroyed on release.
1127 * Make sure a caller isn't creating a PFS from non-root PFS.
1130 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred,
1131 hammer_pseudofs_inmem_t pfsm, hammer_inode_t dip)
1137 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
1138 pfsm->localization, 0, &error);
1140 if (lo_to_pfs(dip->obj_localization) != HAMMER_ROOT_PFSID) {
1141 hmkprintf(trans->hmp,
1142 "Warning: creating a PFS from non-root PFS "
1143 "is not allowed\n");
1149 error = hammer_create_inode(trans, &vap, cred,
1153 ++ip->ino_data.nlinks;
1154 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY);
1158 hammer_rel_inode(ip, 0);
1163 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY
1164 * if we are unable to disassociate all the inodes.
1168 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data)
1172 hammer_ref(&ip->lock);
1173 if (ip->vp && (ip->vp->v_flag & VPFSROOT)) {
1175 * The hammer pfs-upgrade directive itself might have the
1176 * root of the pfs open. Just allow it.
1181 * Don't allow any subdirectories or files to be open.
1183 if (hammer_isactive(&ip->lock) == 2 && ip->vp)
1184 vclean_unlocked(ip->vp);
1185 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL)
1188 res = -1; /* stop, someone is using the inode */
1190 hammer_rel_inode(ip, 0);
1195 hammer_unload_pseudofs(hammer_transaction_t trans, uint32_t localization)
1200 for (try = res = 0; try < 4; ++try) {
1201 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root,
1202 hammer_inode_pfs_cmp,
1203 hammer_unload_pseudofs_callback,
1205 if (res == 0 && try > 1)
1207 hammer_flusher_sync(trans->hmp);
1216 * Release a reference on a PFS
1219 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm)
1221 hammer_rel(&pfsm->lock);
1222 if (hammer_norefs(&pfsm->lock)) {
1223 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm);
1224 kfree(pfsm, hmp->m_misc);
1229 * Called by hammer_sync_inode().
1232 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip)
1234 hammer_transaction_t trans = cursor->trans;
1235 hammer_record_t record;
1243 * If the inode has a presence on-disk then locate it and mark
1244 * it deleted, setting DELONDISK.
1246 * The record may or may not be physically deleted, depending on
1247 * the retention policy.
1249 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
1250 HAMMER_INODE_ONDISK) {
1251 hammer_normalize_cursor(cursor);
1252 cursor->key_beg.localization = ip->obj_localization |
1253 HAMMER_LOCALIZE_INODE;
1254 cursor->key_beg.obj_id = ip->obj_id;
1255 cursor->key_beg.key = 0;
1256 cursor->key_beg.create_tid = 0;
1257 cursor->key_beg.delete_tid = 0;
1258 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1259 cursor->key_beg.obj_type = 0;
1260 cursor->asof = ip->obj_asof;
1261 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1262 cursor->flags |= HAMMER_CURSOR_ASOF;
1263 cursor->flags |= HAMMER_CURSOR_BACKEND;
1265 error = hammer_btree_lookup(cursor);
1266 if (hammer_debug_inode)
1267 hdkprintf("IPDEL %p %08x %d\n", ip, ip->flags, error);
1270 error = hammer_ip_delete_record(cursor, ip, trans->tid);
1271 if (hammer_debug_inode)
1272 hdkprintf("error %d\n", error);
1274 ip->flags |= HAMMER_INODE_DELONDISK;
1277 hammer_cache_node(&ip->cache[0], cursor->node);
1279 if (error == EDEADLK) {
1280 hammer_done_cursor(cursor);
1281 error = hammer_init_cursor(trans, cursor,
1283 if (hammer_debug_inode)
1284 hdkprintf("IPDED %p %d\n", ip, error);
1291 * Ok, write out the initial record or a new record (after deleting
1292 * the old one), unless the DELETED flag is set. This routine will
1293 * clear DELONDISK if it writes out a record.
1295 * Update our inode statistics if this is the first application of
1296 * the inode on-disk.
1298 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
1300 * Generate a record and write it to the media. We clean-up
1301 * the state before releasing so we do not have to set-up
1304 record = hammer_alloc_mem_record(ip, 0);
1305 record->type = HAMMER_MEM_RECORD_INODE;
1306 record->flush_state = HAMMER_FST_FLUSH;
1307 record->leaf = ip->sync_ino_leaf;
1308 record->leaf.base.create_tid = trans->tid;
1309 record->leaf.data_len = sizeof(ip->sync_ino_data);
1310 record->leaf.create_ts = trans->time32;
1311 record->data = (void *)&ip->sync_ino_data;
1312 record->flags |= HAMMER_RECF_INTERLOCK_BE;
1315 * If this flag is set we cannot sync the new file size
1316 * because we haven't finished related truncations. The
1317 * inode will be flushed in another flush group to finish
1320 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) &&
1321 ip->sync_ino_data.size != ip->ino_data.size) {
1323 ip->sync_ino_data.size = ip->ino_data.size;
1329 error = hammer_ip_sync_record_cursor(cursor, record);
1330 if (hammer_debug_inode)
1331 hdkprintf("GENREC %p rec %08x %d\n",
1332 ip, record->flags, error);
1333 if (error != EDEADLK)
1335 hammer_done_cursor(cursor);
1336 error = hammer_init_cursor(trans, cursor,
1338 if (hammer_debug_inode)
1339 hdkprintf("GENREC reinit %d\n", error);
1345 * Note: The record was never on the inode's record tree
1346 * so just wave our hands importantly and destroy it.
1348 record->flags |= HAMMER_RECF_COMMITTED;
1349 record->flags &= ~HAMMER_RECF_INTERLOCK_BE;
1350 record->flush_state = HAMMER_FST_IDLE;
1351 ++ip->rec_generation;
1352 hammer_rel_mem_record(record);
1358 if (hammer_debug_inode)
1359 hdkprintf("CLEANDELOND %p %08x\n", ip, ip->flags);
1360 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1361 HAMMER_INODE_SDIRTY |
1362 HAMMER_INODE_ATIME |
1363 HAMMER_INODE_MTIME);
1364 ip->flags &= ~HAMMER_INODE_DELONDISK;
1366 ip->sync_flags |= HAMMER_INODE_DDIRTY;
1369 * Root volume count of inodes
1371 hammer_sync_lock_sh(trans);
1372 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) {
1373 hammer_modify_volume_field(trans,
1376 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes;
1377 hammer_modify_volume_done(trans->rootvol);
1378 ip->flags |= HAMMER_INODE_ONDISK;
1379 if (hammer_debug_inode)
1380 hdkprintf("NOWONDISK %p\n", ip);
1382 hammer_sync_unlock(trans);
1387 * If the inode has been destroyed, clean out any left-over flags
1388 * that may have been set by the frontend.
1390 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) {
1391 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY |
1392 HAMMER_INODE_SDIRTY |
1393 HAMMER_INODE_ATIME |
1394 HAMMER_INODE_MTIME);
1400 * Update only the itimes fields.
1402 * ATIME can be updated without generating any UNDO. MTIME is updated
1403 * with UNDO so it is guaranteed to be synchronized properly in case of
1406 * Neither field is included in the B-Tree leaf element's CRC, which is how
1407 * we can get away with updating ATIME the way we do.
1410 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip)
1412 hammer_transaction_t trans = cursor->trans;
1416 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) !=
1417 HAMMER_INODE_ONDISK) {
1421 hammer_normalize_cursor(cursor);
1422 cursor->key_beg.localization = ip->obj_localization |
1423 HAMMER_LOCALIZE_INODE;
1424 cursor->key_beg.obj_id = ip->obj_id;
1425 cursor->key_beg.key = 0;
1426 cursor->key_beg.create_tid = 0;
1427 cursor->key_beg.delete_tid = 0;
1428 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE;
1429 cursor->key_beg.obj_type = 0;
1430 cursor->asof = ip->obj_asof;
1431 cursor->flags &= ~HAMMER_CURSOR_INITMASK;
1432 cursor->flags |= HAMMER_CURSOR_ASOF;
1433 cursor->flags |= HAMMER_CURSOR_GET_DATA;
1434 cursor->flags |= HAMMER_CURSOR_BACKEND;
1436 error = hammer_btree_lookup(cursor);
1438 hammer_cache_node(&ip->cache[0], cursor->node);
1439 if (ip->sync_flags & HAMMER_INODE_MTIME) {
1441 * Updating MTIME requires an UNDO. Just cover
1442 * both atime and mtime.
1444 hammer_sync_lock_sh(trans);
1445 hammer_modify_buffer(trans, cursor->data_buffer,
1446 &cursor->data->inode.mtime,
1447 sizeof(cursor->data->inode.atime) +
1448 sizeof(cursor->data->inode.mtime));
1449 cursor->data->inode.atime = ip->sync_ino_data.atime;
1450 cursor->data->inode.mtime = ip->sync_ino_data.mtime;
1451 hammer_modify_buffer_done(cursor->data_buffer);
1452 hammer_sync_unlock(trans);
1453 } else if (ip->sync_flags & HAMMER_INODE_ATIME) {
1455 * Updating atime only can be done in-place with
1458 hammer_sync_lock_sh(trans);
1459 hammer_modify_buffer_noundo(trans, cursor->data_buffer);
1460 cursor->data->inode.atime = ip->sync_ino_data.atime;
1461 hammer_modify_buffer_done(cursor->data_buffer);
1462 hammer_sync_unlock(trans);
1464 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME);
1466 if (error == EDEADLK) {
1467 hammer_done_cursor(cursor);
1468 error = hammer_init_cursor(trans, cursor, &ip->cache[0], ip);
1476 * Release a reference on an inode, flush as requested.
1478 * On the last reference we queue the inode to the flusher for its final
1482 hammer_rel_inode(hammer_inode_t ip, int flush)
1485 * Handle disposition when dropping the last ref.
1488 if (hammer_oneref(&ip->lock)) {
1490 * Determine whether on-disk action is needed for
1491 * the inode's final disposition.
1493 KKASSERT(ip->vp == NULL);
1494 hammer_inode_unloadable_check(ip, 0);
1495 if (ip->flags & HAMMER_INODE_MODMASK) {
1496 hammer_flush_inode(ip, 0);
1497 } else if (hammer_oneref(&ip->lock)) {
1498 hammer_unload_inode(ip);
1503 hammer_flush_inode(ip, 0);
1506 * The inode still has multiple refs, try to drop
1509 KKASSERT(hammer_isactive(&ip->lock) >= 1);
1510 if (hammer_isactive(&ip->lock) > 1) {
1511 hammer_rel(&ip->lock);
1519 * Unload and destroy the specified inode. Must be called with one remaining
1520 * reference. The reference is disposed of.
1522 * The inode must be completely clean.
1525 hammer_unload_inode(hammer_inode_t ip)
1527 hammer_mount_t hmp = ip->hmp;
1529 KASSERT(hammer_oneref(&ip->lock),
1530 ("hammer_unload_inode: %d refs", hammer_isactive(&ip->lock)));
1531 KKASSERT(ip->vp == NULL);
1532 KKASSERT(ip->flush_state == HAMMER_FST_IDLE);
1533 KKASSERT(ip->cursor_ip_refs == 0);
1534 KKASSERT(hammer_notlocked(&ip->lock));
1535 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0);
1537 KKASSERT(RB_EMPTY(&ip->rec_tree));
1538 KKASSERT(TAILQ_EMPTY(&ip->target_list));
1540 if (ip->flags & HAMMER_INODE_RDIRTY) {
1541 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip);
1542 ip->flags &= ~HAMMER_INODE_RDIRTY;
1544 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip);
1546 hammer_free_inode(ip);
1551 * Called during unmounting if a critical error occured. The in-memory
1552 * inode and all related structures are destroyed.
1554 * If a critical error did not occur the unmount code calls the standard
1555 * release and asserts that the inode is gone.
1558 hammer_destroy_inode_callback(hammer_inode_t ip, void *data __unused)
1560 hammer_record_t rec;
1563 * Get rid of the inodes in-memory records, regardless of their
1564 * state, and clear the mod-mask.
1566 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) {
1567 TAILQ_REMOVE(&ip->target_list, rec, target_entry);
1568 rec->target_ip = NULL;
1569 if (rec->flush_state == HAMMER_FST_SETUP)
1570 rec->flush_state = HAMMER_FST_IDLE;
1572 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) {
1573 if (rec->flush_state == HAMMER_FST_FLUSH)
1574 --rec->flush_group->refs;
1576 hammer_ref(&rec->lock);
1577 KKASSERT(hammer_oneref(&rec->lock));
1578 rec->flush_state = HAMMER_FST_IDLE;
1579 rec->flush_group = NULL;
1580 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */
1581 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */
1582 ++ip->rec_generation;
1583 hammer_rel_mem_record(rec);
1585 ip->flags &= ~HAMMER_INODE_MODMASK;
1586 ip->sync_flags &= ~HAMMER_INODE_MODMASK;
1587 KKASSERT(ip->vp == NULL);
1590 * Remove the inode from any flush group, force it idle. FLUSH
1591 * and SETUP states have an inode ref.
1593 switch(ip->flush_state) {
1594 case HAMMER_FST_FLUSH:
1595 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
1596 --ip->flush_group->refs;
1597 ip->flush_group = NULL;
1599 case HAMMER_FST_SETUP:
1600 hammer_rel(&ip->lock);
1601 ip->flush_state = HAMMER_FST_IDLE;
1603 case HAMMER_FST_IDLE:
1608 * There shouldn't be any associated vnode. The unload needs at
1609 * least one ref, if we do have a vp steal its ip ref.
1612 hdkprintf("Unexpected vnode association ip %p vp %p\n",
1614 ip->vp->v_data = NULL;
1617 hammer_ref(&ip->lock);
1619 hammer_unload_inode(ip);
1624 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1625 * the read-only flag for cached inodes.
1627 * This routine is called from a RB_SCAN().
1630 hammer_reload_inode(hammer_inode_t ip, void *arg __unused)
1632 hammer_mount_t hmp = ip->hmp;
1634 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID)
1635 ip->flags |= HAMMER_INODE_RO;
1637 ip->flags &= ~HAMMER_INODE_RO;
1642 * A transaction has modified an inode, requiring updates as specified by
1645 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime,
1646 * and not including size changes due to write-append
1647 * (but other size changes are included).
1648 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to
1650 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1651 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1652 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1653 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1656 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags)
1659 * ronly of 0 or 2 does not trigger assertion.
1660 * 2 is a special error state
1662 KKASSERT(ip->hmp->ronly != 1 ||
1663 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
1664 HAMMER_INODE_SDIRTY |
1665 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED |
1666 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0);
1667 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) {
1668 ip->flags |= HAMMER_INODE_RSV_INODES;
1669 ++ip->hmp->rsv_inodes;
1673 * Set the NEWINODE flag in the transaction if the inode
1674 * transitions to a dirty state. This is used to track
1675 * the load on the inode cache.
1678 (ip->flags & HAMMER_INODE_MODMASK) == 0 &&
1679 (flags & HAMMER_INODE_MODMASK)) {
1680 trans->flags |= HAMMER_TRANSF_NEWINODE;
1682 if (flags & HAMMER_INODE_MODMASK)
1683 hammer_inode_dirty(ip);
1688 * Attempt to quickly update the atime for a hammer inode. Return 0 on
1689 * success, -1 on failure.
1691 * We attempt to update the atime with only the ip lock and not the
1692 * whole filesystem lock in order to improve concurrency. We can only
1693 * do this safely if the ATIME flag is already pending on the inode.
1695 * This function is called via a vnops path (ip pointer is stable) without
1699 hammer_update_atime_quick(hammer_inode_t ip)
1704 if ((ip->flags & HAMMER_INODE_RO) ||
1705 (ip->hmp->mp->mnt_flag & MNT_NOATIME)) {
1707 * Silently indicate success on read-only mount/snap
1710 } else if (ip->flags & HAMMER_INODE_ATIME) {
1712 * Double check with inode lock held against backend. This
1713 * is only safe if all we need to do is update
1717 hammer_lock_ex(&ip->lock);
1718 if (ip->flags & HAMMER_INODE_ATIME) {
1719 ip->ino_data.atime =
1720 (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
1723 hammer_unlock(&ip->lock);
1729 * Request that an inode be flushed. This whole mess cannot block and may
1730 * recurse (if not synchronous). Once requested HAMMER will attempt to
1731 * actively flush the inode until the flush can be done.
1733 * The inode may already be flushing, or may be in a setup state. We can
1734 * place the inode in a flushing state if it is currently idle and flag it
1735 * to reflush if it is currently flushing.
1737 * Upon return if the inode could not be flushed due to a setup
1738 * dependancy, then it will be automatically flushed when the dependancy
1742 hammer_flush_inode(hammer_inode_t ip, int flags)
1745 hammer_flush_group_t flg;
1749 * fill_flush_group is the first flush group we may be able to
1750 * continue filling, it may be open or closed but it will always
1751 * be past the currently flushing (running) flg.
1753 * next_flush_group is the next open flush group.
1756 while ((flg = hmp->fill_flush_group) != NULL) {
1757 KKASSERT(flg->running == 0);
1758 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit &&
1759 flg->total_count <= hammer_autoflush) {
1762 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
1763 hammer_flusher_async(ip->hmp, flg);
1766 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO);
1767 flg->seq = hmp->flusher.next++;
1768 if (hmp->next_flush_group == NULL)
1769 hmp->next_flush_group = flg;
1770 if (hmp->fill_flush_group == NULL)
1771 hmp->fill_flush_group = flg;
1772 RB_INIT(&flg->flush_tree);
1773 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry);
1777 * Trivial 'nothing to flush' case. If the inode is in a SETUP
1778 * state we have to put it back into an IDLE state so we can
1779 * drop the extra ref.
1781 * If we have a parent dependancy we must still fall through
1784 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) {
1785 if (ip->flush_state == HAMMER_FST_SETUP &&
1786 TAILQ_EMPTY(&ip->target_list)) {
1787 ip->flush_state = HAMMER_FST_IDLE;
1788 hammer_rel_inode(ip, 0);
1790 if (ip->flush_state == HAMMER_FST_IDLE)
1795 * Our flush action will depend on the current state.
1797 switch(ip->flush_state) {
1798 case HAMMER_FST_IDLE:
1800 * We have no dependancies and can flush immediately. Some
1801 * our children may not be flushable so we have to re-test
1802 * with that additional knowledge.
1804 hammer_flush_inode_core(ip, flg, flags);
1806 case HAMMER_FST_SETUP:
1808 * Recurse upwards through dependancies via target_list
1809 * and start their flusher actions going if possible.
1811 * 'good' is our connectivity. -1 means we have none and
1812 * can't flush, 0 means there weren't any dependancies, and
1813 * 1 means we have good connectivity.
1815 good = hammer_setup_parent_inodes(ip, 0, flg);
1819 * We can continue if good >= 0. Determine how
1820 * many records under our inode can be flushed (and
1823 hammer_flush_inode_core(ip, flg, flags);
1826 * Parent has no connectivity, tell it to flush
1827 * us as soon as it does.
1829 * The REFLUSH flag is also needed to trigger
1830 * dependancy wakeups.
1832 ip->flags |= HAMMER_INODE_CONN_DOWN |
1833 HAMMER_INODE_REFLUSH;
1834 if (flags & HAMMER_FLUSH_SIGNAL) {
1835 ip->flags |= HAMMER_INODE_RESIGNAL;
1836 hammer_flusher_async(ip->hmp, flg);
1840 case HAMMER_FST_FLUSH:
1842 * We are already flushing, flag the inode to reflush
1843 * if needed after it completes its current flush.
1845 * The REFLUSH flag is also needed to trigger
1846 * dependancy wakeups.
1848 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0)
1849 ip->flags |= HAMMER_INODE_REFLUSH;
1850 if (flags & HAMMER_FLUSH_SIGNAL) {
1851 ip->flags |= HAMMER_INODE_RESIGNAL;
1852 hammer_flusher_async(ip->hmp, flg);
1859 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1860 * ip which reference our ip.
1862 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1863 * so for now do not ref/deref the structures. Note that if we use the
1864 * ref/rel code later, the rel CAN block.
1867 hammer_setup_parent_inodes(hammer_inode_t ip, int depth,
1868 hammer_flush_group_t flg)
1870 hammer_record_t depend;
1875 * If we hit our recursion limit and we have parent dependencies
1876 * We cannot continue. Returning < 0 will cause us to be flagged
1877 * for reflush. Returning -2 cuts off additional dependency checks
1878 * because they are likely to also hit the depth limit.
1880 * We cannot return < 0 if there are no dependencies or there might
1881 * not be anything to wakeup (ip).
1883 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) {
1884 if (hammer_debug_general & 0x10000)
1885 hkrateprintf(&hammer_gen_krate,
1886 "Warning: depth limit reached on "
1887 "setup recursion, inode %p %016jx\n",
1888 ip, (intmax_t)ip->obj_id);
1896 TAILQ_FOREACH(depend, &ip->target_list, target_entry) {
1897 r = hammer_setup_parent_inodes_helper(depend, depth, flg);
1898 KKASSERT(depend->target_ip == ip);
1899 if (r < 0 && good == 0)
1905 * If we failed due to the recursion depth limit then stop
1915 * This helper function takes a record representing the dependancy between
1916 * the parent inode and child inode.
1918 * record = record in question (*rec in below)
1919 * record->ip = parent inode (*pip in below)
1920 * record->target_ip = child inode (*ip in below)
1922 * *pip--------------\
1925 * \ip /\\\\\ rbtree of recs from parent inode's view
1929 * \------*rec------target_ip------>*ip
1930 * ...target_entry<----...----->target_list<---...
1931 * list of recs from inode's view
1933 * We are asked to recurse upwards and convert the record from SETUP
1934 * to FLUSH if possible.
1936 * Return 1 if the record gives us connectivity
1938 * Return 0 if the record is not relevant
1940 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1943 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth,
1944 hammer_flush_group_t flg)
1949 KKASSERT(record->flush_state != HAMMER_FST_IDLE);
1953 * If the record is already flushing, is it in our flush group?
1955 * If it is in our flush group but it is a general record or a
1956 * delete-on-disk, it does not improve our connectivity (return 0),
1957 * and if the target inode is not trying to destroy itself we can't
1958 * allow the operation yet anyway (the second return -1).
1960 if (record->flush_state == HAMMER_FST_FLUSH) {
1962 * If not in our flush group ask the parent to reflush
1963 * us as soon as possible.
1965 if (record->flush_group != flg) {
1966 pip->flags |= HAMMER_INODE_REFLUSH;
1967 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
1972 * If in our flush group everything is already set up,
1973 * just return whether the record will improve our
1974 * visibility or not.
1976 if (record->type == HAMMER_MEM_RECORD_ADD)
1982 * It must be a setup record. Try to resolve the setup dependancies
1983 * by recursing upwards so we can place ip on the flush list.
1985 * Limit ourselves to 20 levels of recursion to avoid blowing out
1986 * the kernel stack. If we hit the recursion limit we can't flush
1987 * until the parent flushes. The parent will flush independantly
1988 * on its own and ultimately a deep recursion will be resolved.
1990 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
1992 good = hammer_setup_parent_inodes(pip, depth + 1, flg);
1995 * If good < 0 the parent has no connectivity and we cannot safely
1996 * flush the directory entry, which also means we can't flush our
1997 * ip. Flag us for downward recursion once the parent's
1998 * connectivity is resolved. Flag the parent for [re]flush or it
1999 * may not check for downward recursions.
2002 pip->flags |= HAMMER_INODE_REFLUSH;
2003 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
2008 * We are go, place the parent inode in a flushing state so we can
2009 * place its record in a flushing state. Note that the parent
2010 * may already be flushing. The record must be in the same flush
2011 * group as the parent.
2013 if (pip->flush_state != HAMMER_FST_FLUSH)
2014 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION);
2015 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH);
2018 * It is possible for a rename to create a loop in the recursion
2019 * and revisit a record. This will result in the record being
2020 * placed in a flush state unexpectedly. This check deals with
2023 if (record->flush_state == HAMMER_FST_FLUSH) {
2024 if (record->type == HAMMER_MEM_RECORD_ADD)
2029 KKASSERT(record->flush_state == HAMMER_FST_SETUP);
2032 if (record->type == HAMMER_MEM_RECORD_DEL &&
2033 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) {
2035 * Regardless of flushing state we cannot sync this path if the
2036 * record represents a delete-on-disk but the target inode
2037 * is not ready to sync its own deletion.
2039 * XXX need to count effective nlinks to determine whether
2040 * the flush is ok, otherwise removing a hardlink will
2041 * just leave the DEL record to rot.
2043 record->target_ip->flags |= HAMMER_INODE_REFLUSH;
2047 if (pip->flush_group == flg) {
2049 * Because we have not calculated nlinks yet we can just
2050 * set records to the flush state if the parent is in
2051 * the same flush group as we are.
2053 record->flush_state = HAMMER_FST_FLUSH;
2054 record->flush_group = flg;
2055 ++record->flush_group->refs;
2056 hammer_ref(&record->lock);
2059 * A general directory-add contributes to our visibility.
2061 * Otherwise it is probably a directory-delete or
2062 * delete-on-disk record and does not contribute to our
2063 * visbility (but we can still flush it).
2065 if (record->type == HAMMER_MEM_RECORD_ADD)
2070 * If the parent is not in our flush group we cannot
2071 * flush this record yet, there is no visibility.
2072 * We tell the parent to reflush and mark ourselves
2073 * so the parent knows it should flush us too.
2075 pip->flags |= HAMMER_INODE_REFLUSH;
2076 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN;
2082 * This is the core routine placing an inode into the FST_FLUSH state.
2085 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags)
2087 hammer_mount_t hmp = ip->hmp;
2091 * Set flush state and prevent the flusher from cycling into
2092 * the next flush group. Do not place the ip on the list yet.
2093 * Inodes not in the idle state get an extra reference.
2095 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH);
2096 if (ip->flush_state == HAMMER_FST_IDLE)
2097 hammer_ref(&ip->lock);
2098 ip->flush_state = HAMMER_FST_FLUSH;
2099 ip->flush_group = flg;
2100 ++hmp->flusher.group_lock;
2101 ++hmp->count_iqueued;
2102 ++hammer_count_iqueued;
2104 hammer_redo_fifo_start_flush(ip);
2108 * We need to be able to vfsync/truncate from the backend.
2110 * XXX Any truncation from the backend will acquire the vnode
2113 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0);
2114 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) {
2115 ip->flags |= HAMMER_INODE_VHELD;
2121 * Figure out how many in-memory records we can actually flush
2122 * (not including inode meta-data, buffers, etc).
2124 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0);
2125 if (flags & HAMMER_FLUSH_RECURSION) {
2127 * If this is a upwards recursion we do not want to
2128 * recurse down again!
2132 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2134 * No new records are added if we must complete a flush
2135 * from a previous cycle, but we do have to move the records
2136 * from the previous cycle to the current one.
2139 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2140 hammer_syncgrp_child_callback, NULL);
2146 * Normal flush, scan records and bring them into the flush.
2147 * Directory adds and deletes are usually skipped (they are
2148 * grouped with the related inode rather then with the
2151 * go_count can be negative, which means the scan aborted
2152 * due to the flush group being over-full and we should
2153 * flush what we have.
2155 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
2156 hammer_setup_child_callback, NULL);
2160 * This is a more involved test that includes go_count. If we
2161 * can't flush, flag the inode and return. If go_count is 0 we
2162 * were are unable to flush any records in our rec_tree and
2163 * must ignore the XDIRTY flag.
2165 if (go_count == 0) {
2166 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) {
2167 --hmp->count_iqueued;
2168 --hammer_count_iqueued;
2171 ip->flush_state = HAMMER_FST_SETUP;
2172 ip->flush_group = NULL;
2173 if (flags & HAMMER_FLUSH_SIGNAL) {
2174 ip->flags |= HAMMER_INODE_REFLUSH |
2175 HAMMER_INODE_RESIGNAL;
2177 ip->flags |= HAMMER_INODE_REFLUSH;
2180 if (ip->flags & HAMMER_INODE_VHELD) {
2181 ip->flags &= ~HAMMER_INODE_VHELD;
2187 * REFLUSH is needed to trigger dependancy wakeups
2188 * when an inode is in SETUP.
2190 ip->flags |= HAMMER_INODE_REFLUSH;
2191 if (--hmp->flusher.group_lock == 0)
2192 wakeup(&hmp->flusher.group_lock);
2198 * Snapshot the state of the inode for the backend flusher.
2200 * We continue to retain save_trunc_off even when all truncations
2201 * have been resolved as an optimization to determine if we can
2202 * skip the B-Tree lookup for overwrite deletions.
2204 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
2205 * and stays in ip->flags. Once set, it stays set until the
2206 * inode is destroyed.
2208 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2209 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0);
2210 ip->sync_trunc_off = ip->trunc_off;
2211 ip->trunc_off = HAMMER_MAX_KEY;
2212 ip->flags &= ~HAMMER_INODE_TRUNCATED;
2213 ip->sync_flags |= HAMMER_INODE_TRUNCATED;
2216 * The save_trunc_off used to cache whether the B-Tree
2217 * holds any records past that point is not used until
2218 * after the truncation has succeeded, so we can safely
2221 if (ip->save_trunc_off > ip->sync_trunc_off)
2222 ip->save_trunc_off = ip->sync_trunc_off;
2224 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK &
2225 ~HAMMER_INODE_TRUNCATED);
2226 ip->sync_ino_leaf = ip->ino_leaf;
2227 ip->sync_ino_data = ip->ino_data;
2228 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED;
2231 * The flusher list inherits our inode and reference.
2233 KKASSERT(flg->running == 0);
2234 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip);
2235 if (--hmp->flusher.group_lock == 0)
2236 wakeup(&hmp->flusher.group_lock);
2239 * Auto-flush the group if it grows too large. Make sure the
2240 * inode reclaim wait pipeline continues to work.
2242 if (flg->total_count >= hammer_autoflush ||
2243 flg->total_count >= hammer_limit_reclaims / 4) {
2244 if (hmp->fill_flush_group == flg)
2245 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry);
2246 hammer_flusher_async(hmp, flg);
2251 * Callback for scan of ip->rec_tree. Try to include each record in our
2252 * flush. ip->flush_group has been set but the inode has not yet been
2253 * moved into a flushing state.
2255 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
2258 * We return 1 for any record placed or found in FST_FLUSH, which prevents
2259 * the caller from shortcutting the flush.
2262 hammer_setup_child_callback(hammer_record_t rec, void *data)
2264 hammer_flush_group_t flg;
2265 hammer_inode_t target_ip;
2270 * Records deleted or committed by the backend are ignored.
2271 * Note that the flush detects deleted frontend records at
2272 * multiple points to deal with races. This is just the first
2273 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot
2274 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it
2275 * messes up link-count calculations.
2277 * NOTE: Don't get confused between record deletion and, say,
2278 * directory entry deletion. The deletion of a directory entry
2279 * which is on-media has nothing to do with the record deletion
2282 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE |
2283 HAMMER_RECF_COMMITTED)) {
2284 if (rec->flush_state == HAMMER_FST_FLUSH) {
2285 KKASSERT(rec->flush_group == rec->ip->flush_group);
2294 * If the record is in an idle state it has no dependancies and
2298 flg = ip->flush_group;
2301 switch(rec->flush_state) {
2302 case HAMMER_FST_IDLE:
2304 * The record has no setup dependancy, we can flush it.
2306 KKASSERT(rec->target_ip == NULL);
2307 rec->flush_state = HAMMER_FST_FLUSH;
2308 rec->flush_group = flg;
2310 hammer_ref(&rec->lock);
2313 case HAMMER_FST_SETUP:
2315 * The record has a setup dependancy. These are typically
2316 * directory entry adds and deletes. Such entries will be
2317 * flushed when their inodes are flushed so we do not
2318 * usually have to add them to the flush here. However,
2319 * if the target_ip has set HAMMER_INODE_CONN_DOWN then
2320 * it is asking us to flush this record (and it).
2322 target_ip = rec->target_ip;
2323 KKASSERT(target_ip != NULL);
2324 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE);
2327 * If the target IP is already flushing in our group
2328 * we could associate the record, but target_ip has
2329 * already synced ino_data to sync_ino_data and we
2330 * would also have to adjust nlinks. Plus there are
2331 * ordering issues for adds and deletes.
2333 * Reflush downward if this is an ADD, and upward if
2336 if (target_ip->flush_state == HAMMER_FST_FLUSH) {
2337 if (rec->type == HAMMER_MEM_RECORD_ADD)
2338 ip->flags |= HAMMER_INODE_REFLUSH;
2340 target_ip->flags |= HAMMER_INODE_REFLUSH;
2345 * Target IP is not yet flushing. This can get complex
2346 * because we have to be careful about the recursion.
2348 * Directories create an issue for us in that if a flush
2349 * of a directory is requested the expectation is to flush
2350 * any pending directory entries, but this will cause the
2351 * related inodes to recursively flush as well. We can't
2352 * really defer the operation so just get as many as we
2356 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 &&
2357 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) {
2359 * We aren't reclaiming and the target ip was not
2360 * previously prevented from flushing due to this
2361 * record dependancy. Do not flush this record.
2366 if (flg->total_count + flg->refs >
2367 ip->hmp->undo_rec_limit) {
2369 * Our flush group is over-full and we risk blowing
2370 * out the UNDO FIFO. Stop the scan, flush what we
2371 * have, then reflush the directory.
2373 * The directory may be forced through multiple
2374 * flush groups before it can be completely
2377 ip->flags |= HAMMER_INODE_RESIGNAL |
2378 HAMMER_INODE_REFLUSH;
2380 } else if (rec->type == HAMMER_MEM_RECORD_ADD) {
2382 * If the target IP is not flushing we can force
2383 * it to flush, even if it is unable to write out
2384 * any of its own records we have at least one in
2385 * hand that we CAN deal with.
2387 rec->flush_state = HAMMER_FST_FLUSH;
2388 rec->flush_group = flg;
2390 hammer_ref(&rec->lock);
2391 hammer_flush_inode_core(target_ip, flg,
2392 HAMMER_FLUSH_RECURSION);
2396 * General or delete-on-disk record.
2398 * XXX this needs help. If a delete-on-disk we could
2399 * disconnect the target. If the target has its own
2400 * dependancies they really need to be flushed.
2404 rec->flush_state = HAMMER_FST_FLUSH;
2405 rec->flush_group = flg;
2407 hammer_ref(&rec->lock);
2408 hammer_flush_inode_core(target_ip, flg,
2409 HAMMER_FLUSH_RECURSION);
2413 case HAMMER_FST_FLUSH:
2415 * The record could be part of a previous flush group if the
2416 * inode is a directory (the record being a directory entry).
2417 * Once the flush group was closed a hammer_test_inode()
2418 * function can cause a new flush group to be setup, placing
2419 * the directory inode itself in a new flush group.
2421 * When associated with a previous flush group we count it
2422 * as if it were in our current flush group, since it will
2423 * effectively be flushed by the time we flush our current
2427 rec->ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY ||
2428 rec->flush_group == flg);
2437 * This version just moves records already in a flush state to the new
2438 * flush group and that is it.
2441 hammer_syncgrp_child_callback(hammer_record_t rec, void *data)
2443 hammer_inode_t ip = rec->ip;
2445 switch(rec->flush_state) {
2446 case HAMMER_FST_FLUSH:
2447 KKASSERT(rec->flush_group == ip->flush_group);
2457 * Wait for a previously queued flush to complete.
2459 * If a critical error occured we don't try to wait.
2462 hammer_wait_inode(hammer_inode_t ip)
2465 * The inode can be in a SETUP state in which case RESIGNAL
2466 * should be set. If RESIGNAL is not set then the previous
2467 * flush completed and a later operation placed the inode
2468 * in a passive setup state again, so we're done.
2470 * The inode can be in a FLUSH state in which case we
2471 * can just wait for completion.
2473 while (ip->flush_state == HAMMER_FST_FLUSH ||
2474 (ip->flush_state == HAMMER_FST_SETUP &&
2475 (ip->flags & HAMMER_INODE_RESIGNAL))) {
2477 * Don't try to flush on a critical error
2479 if (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR)
2483 * If the inode was already being flushed its flg
2484 * may not have been queued to the backend. We
2485 * have to make sure it gets queued or we can wind
2486 * up blocked or deadlocked (particularly if we are
2487 * the vnlru thread).
2489 if (ip->flush_state == HAMMER_FST_FLUSH) {
2490 KKASSERT(ip->flush_group);
2491 if (ip->flush_group->closed == 0) {
2492 if (hammer_debug_inode) {
2493 hkprintf("debug: forcing "
2494 "async flush ip %016jx\n",
2495 (intmax_t)ip->obj_id);
2497 hammer_flusher_async(ip->hmp, ip->flush_group);
2498 continue; /* retest */
2503 * In a flush state with the flg queued to the backend
2504 * or in a setup state with RESIGNAL set, we can safely
2507 ip->flags |= HAMMER_INODE_FLUSHW;
2508 tsleep(&ip->flags, 0, "hmrwin", 0);
2513 * The inode may have been in a passive setup state,
2514 * call flush to make sure we get signaled.
2516 if (ip->flush_state == HAMMER_FST_SETUP)
2517 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2523 * Called by the backend code when a flush has been completed.
2524 * The inode has already been removed from the flush list.
2526 * A pipelined flush can occur, in which case we must re-enter the
2527 * inode on the list and re-copy its fields.
2530 hammer_flush_inode_done(hammer_inode_t ip, int error)
2535 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH);
2540 * Auto-reflush if the backend could not completely flush
2541 * the inode. This fixes a case where a deferred buffer flush
2542 * could cause fsync to return early.
2544 if (ip->sync_flags & HAMMER_INODE_MODMASK)
2545 ip->flags |= HAMMER_INODE_REFLUSH;
2548 * Merge left-over flags back into the frontend and fix the state.
2549 * Incomplete truncations are retained by the backend.
2552 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED;
2553 ip->sync_flags &= HAMMER_INODE_TRUNCATED;
2556 * The backend may have adjusted nlinks, so if the adjusted nlinks
2557 * does not match the fronttend set the frontend's DDIRTY flag again.
2559 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks)
2560 ip->flags |= HAMMER_INODE_DDIRTY;
2563 * Fix up the dirty buffer status.
2565 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) {
2566 ip->flags |= HAMMER_INODE_BUFS;
2568 hammer_redo_fifo_end_flush(ip);
2571 * Re-set the XDIRTY flag if some of the inode's in-memory records
2572 * could not be flushed.
2574 KKASSERT((RB_EMPTY(&ip->rec_tree) &&
2575 (ip->flags & HAMMER_INODE_XDIRTY) == 0) ||
2576 (!RB_EMPTY(&ip->rec_tree) &&
2577 (ip->flags & HAMMER_INODE_XDIRTY) != 0));
2580 * Do not lose track of inodes which no longer have vnode
2581 * assocations, otherwise they may never get flushed again.
2583 * The reflush flag can be set superfluously, causing extra pain
2584 * for no reason. If the inode is no longer modified it no longer
2585 * needs to be flushed.
2587 if (ip->flags & HAMMER_INODE_MODMASK) {
2589 ip->flags |= HAMMER_INODE_REFLUSH;
2591 ip->flags &= ~HAMMER_INODE_REFLUSH;
2595 * The fs token is held but the inode lock is not held. Because this
2596 * is a backend flush it is possible that the vnode has no references
2597 * and cause a reclaim race inside vsetisdirty() if/when it blocks.
2599 * Therefore, we must lock the inode around this particular dirtying
2600 * operation. We don't have to around other dirtying operations
2601 * where the vnode is implicitly or explicitly held.
2603 if (ip->flags & HAMMER_INODE_MODMASK) {
2604 hammer_lock_ex(&ip->lock);
2605 hammer_inode_dirty(ip);
2606 hammer_unlock(&ip->lock);
2610 * Adjust the flush state.
2612 if (ip->flags & HAMMER_INODE_WOULDBLOCK) {
2614 * We were unable to flush out all our records, leave the
2615 * inode in a flush state and in the current flush group.
2616 * The flush group will be re-run.
2618 * This occurs if the UNDO block gets too full or there is
2619 * too much dirty meta-data and allows the flusher to
2620 * finalize the UNDO block and then re-flush.
2622 ip->flags &= ~HAMMER_INODE_WOULDBLOCK;
2626 * Remove from the flush_group
2628 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip);
2629 ip->flush_group = NULL;
2633 * Clean up the vnode ref and tracking counts.
2635 if (ip->flags & HAMMER_INODE_VHELD) {
2636 ip->flags &= ~HAMMER_INODE_VHELD;
2640 --hmp->count_iqueued;
2641 --hammer_count_iqueued;
2644 * And adjust the state.
2646 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) {
2647 ip->flush_state = HAMMER_FST_IDLE;
2650 ip->flush_state = HAMMER_FST_SETUP;
2655 * If the frontend is waiting for a flush to complete,
2658 if (ip->flags & HAMMER_INODE_FLUSHW) {
2659 ip->flags &= ~HAMMER_INODE_FLUSHW;
2664 * If the frontend made more changes and requested another
2665 * flush, then try to get it running.
2667 * Reflushes are aborted when the inode is errored out.
2669 if (ip->flags & HAMMER_INODE_REFLUSH) {
2670 ip->flags &= ~HAMMER_INODE_REFLUSH;
2671 if (ip->flags & HAMMER_INODE_RESIGNAL) {
2672 ip->flags &= ~HAMMER_INODE_RESIGNAL;
2673 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
2675 hammer_flush_inode(ip, 0);
2681 * If we have no parent dependancies we can clear CONN_DOWN
2683 if (TAILQ_EMPTY(&ip->target_list))
2684 ip->flags &= ~HAMMER_INODE_CONN_DOWN;
2687 * If the inode is now clean drop the space reservation.
2689 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 &&
2690 (ip->flags & HAMMER_INODE_RSV_INODES)) {
2691 ip->flags &= ~HAMMER_INODE_RSV_INODES;
2695 ip->flags &= ~HAMMER_INODE_SLAVEFLUSH;
2698 hammer_rel_inode(ip, 0);
2702 * Called from hammer_sync_inode() to synchronize in-memory records
2706 hammer_sync_record_callback(hammer_record_t record, void *data)
2708 hammer_cursor_t cursor = data;
2709 hammer_transaction_t trans = cursor->trans;
2710 hammer_mount_t hmp = trans->hmp;
2714 * Skip records that do not belong to the current flush.
2716 ++hammer_stats_record_iterations;
2717 if (record->flush_state != HAMMER_FST_FLUSH)
2720 if (record->flush_group != record->ip->flush_group) {
2721 hdkprintf("rec %p ip %p bad flush group %p %p\n",
2724 record->flush_group,
2725 record->ip->flush_group);
2726 if (hammer_debug_critical)
2730 KKASSERT(record->flush_group == record->ip->flush_group);
2733 * Interlock the record using the BE flag. Once BE is set the
2734 * frontend cannot change the state of FE.
2736 * NOTE: If FE is set prior to us setting BE we still sync the
2737 * record out, but the flush completion code converts it to
2738 * a delete-on-disk record instead of destroying it.
2740 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0);
2741 record->flags |= HAMMER_RECF_INTERLOCK_BE;
2744 * The backend has already disposed of the record.
2746 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) {
2752 * If the whole inode is being deleted and all on-disk records will
2753 * be deleted very soon, we can't sync any new records to disk
2754 * because they will be deleted in the same transaction they were
2755 * created in (delete_tid == create_tid), which will assert.
2757 * XXX There may be a case with RECORD_ADD with DELETED_FE set
2758 * that we currently panic on.
2760 if (record->ip->sync_flags & HAMMER_INODE_DELETING) {
2761 switch(record->type) {
2762 case HAMMER_MEM_RECORD_DATA:
2764 * We don't have to do anything, if the record was
2765 * committed the space will have been accounted for
2769 case HAMMER_MEM_RECORD_GENERAL:
2771 * Set deleted-by-backend flag. Do not set the
2772 * backend committed flag, because we are throwing
2775 record->flags |= HAMMER_RECF_DELETED_BE;
2776 ++record->ip->rec_generation;
2779 case HAMMER_MEM_RECORD_ADD:
2780 hpanic("illegal add during inode deletion record %p",
2782 break; /* NOT REACHED */
2783 case HAMMER_MEM_RECORD_INODE:
2784 hpanic("attempt to sync inode record %p?", record);
2785 break; /* NOT REACHED */
2786 case HAMMER_MEM_RECORD_DEL:
2788 * Follow through and issue the on-disk deletion
2795 * If DELETED_FE is set special handling is needed for directory
2796 * entries. Dependant pieces related to the directory entry may
2797 * have already been synced to disk. If this occurs we have to
2798 * sync the directory entry and then change the in-memory record
2799 * from an ADD to a DELETE to cover the fact that it's been
2800 * deleted by the frontend.
2802 * A directory delete covering record (MEM_RECORD_DEL) can never
2803 * be deleted by the frontend.
2805 * Any other record type (aka DATA) can be deleted by the frontend.
2806 * XXX At the moment the flusher must skip it because there may
2807 * be another data record in the flush group for the same block,
2808 * meaning that some frontend data changes can leak into the backend's
2809 * synchronization point.
2811 if (record->flags & HAMMER_RECF_DELETED_FE) {
2812 if (record->type == HAMMER_MEM_RECORD_ADD) {
2814 * Convert a front-end deleted directory-add to
2815 * a directory-delete entry later.
2817 record->flags |= HAMMER_RECF_CONVERT_DELETE;
2820 * Dispose of the record (race case). Mark as
2821 * deleted by backend (and not committed).
2823 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL);
2824 record->flags |= HAMMER_RECF_DELETED_BE;
2825 ++record->ip->rec_generation;
2832 * Assign the create_tid for new records. Deletions already
2833 * have the record's entire key properly set up.
2835 if (record->type != HAMMER_MEM_RECORD_DEL) {
2836 record->leaf.base.create_tid = trans->tid;
2837 record->leaf.create_ts = trans->time32;
2841 * This actually moves the record to the on-media B-Tree. We
2842 * must also generate REDO_TERM entries in the UNDO/REDO FIFO
2843 * indicating that the related REDO_WRITE(s) have been committed.
2845 * During recovery any REDO_TERM's within the nominal recovery span
2846 * are ignored since the related meta-data is being undone, causing
2847 * any matching REDO_WRITEs to execute. The REDO_TERMs outside
2848 * the nominal recovery span will match against REDO_WRITEs and
2849 * prevent them from being executed (because the meta-data has
2850 * already been synchronized).
2852 if (record->flags & HAMMER_RECF_REDO) {
2853 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA);
2854 hammer_generate_redo(trans, record->ip,
2855 record->leaf.base.key -
2856 record->leaf.data_len,
2857 HAMMER_REDO_TERM_WRITE,
2859 record->leaf.data_len);
2863 error = hammer_ip_sync_record_cursor(cursor, record);
2864 if (error != EDEADLK)
2866 hammer_done_cursor(cursor);
2867 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0],
2872 record->flags &= ~HAMMER_RECF_CONVERT_DELETE;
2877 hammer_flush_record_done(record, error);
2880 * Do partial finalization if we have built up too many dirty
2881 * buffers. Otherwise a buffer cache deadlock can occur when
2882 * doing things like creating tens of thousands of tiny files.
2884 * We must release our cursor lock to avoid a 3-way deadlock
2885 * due to the exclusive sync lock the finalizer must get.
2887 * WARNING: See warnings in hammer_unlock_cursor() function.
2889 if (hammer_flusher_meta_limit(hmp) ||
2890 vm_page_count_severe()) {
2891 hammer_unlock_cursor(cursor);
2892 hammer_flusher_finalize(trans, 0);
2893 hammer_lock_cursor(cursor);
2899 * Backend function called by the flusher to sync an inode to media.
2902 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip)
2904 struct hammer_cursor cursor;
2905 hammer_node_t tmp_node;
2906 hammer_record_t depend;
2907 hammer_record_t next;
2908 int error, tmp_error;
2911 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0)
2914 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip);
2919 * Any directory records referencing this inode which are not in
2920 * our current flush group must adjust our nlink count for the
2921 * purposes of synchronizating to disk.
2923 * Records which are in our flush group can be unlinked from our
2924 * inode now, potentially allowing the inode to be physically
2927 * This cannot block.
2929 nlinks = ip->ino_data.nlinks;
2930 next = TAILQ_FIRST(&ip->target_list);
2931 while ((depend = next) != NULL) {
2932 next = TAILQ_NEXT(depend, target_entry);
2933 if (depend->flush_state == HAMMER_FST_FLUSH &&
2934 depend->flush_group == ip->flush_group) {
2936 * If this is an ADD that was deleted by the frontend
2937 * the frontend nlinks count will have already been
2938 * decremented, but the backend is going to sync its
2939 * directory entry and must account for it. The
2940 * record will be converted to a delete-on-disk when
2943 * If the ADD was not deleted by the frontend we
2944 * can remove the dependancy from our target_list.
2946 if (depend->flags & HAMMER_RECF_DELETED_FE) {
2949 TAILQ_REMOVE(&ip->target_list, depend,
2951 depend->target_ip = NULL;
2953 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) {
2955 * Not part of our flush group and not deleted by
2956 * the front-end, adjust the link count synced to
2957 * the media (undo what the frontend did when it
2958 * queued the record).
2960 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0);
2961 switch(depend->type) {
2962 case HAMMER_MEM_RECORD_ADD:
2965 case HAMMER_MEM_RECORD_DEL:
2975 * Set dirty if we had to modify the link count.
2977 if (ip->sync_ino_data.nlinks != nlinks) {
2978 KKASSERT((int64_t)nlinks >= 0);
2979 ip->sync_ino_data.nlinks = nlinks;
2980 ip->sync_flags |= HAMMER_INODE_DDIRTY;
2984 * If there is a trunction queued destroy any data past the (aligned)
2985 * truncation point. Userland will have dealt with the buffer
2986 * containing the truncation point for us.
2988 * We don't flush pending frontend data buffers until after we've
2989 * dealt with the truncation.
2991 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2993 * Interlock trunc_off. The VOP front-end may continue to
2994 * make adjustments to it while we are blocked.
2997 off_t aligned_trunc_off;
3000 trunc_off = ip->sync_trunc_off;
3001 blkmask = hammer_blocksize(trunc_off) - 1;
3002 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask;
3005 * Delete any whole blocks on-media. The front-end has
3006 * already cleaned out any partial block and made it
3007 * pending. The front-end may have updated trunc_off
3008 * while we were blocked so we only use sync_trunc_off.
3010 * This operation can blow out the buffer cache, EWOULDBLOCK
3011 * means we were unable to complete the deletion. The
3012 * deletion will update sync_trunc_off in that case.
3014 error = hammer_ip_delete_range(&cursor, ip,
3017 if (error == EWOULDBLOCK) {
3018 ip->flags |= HAMMER_INODE_WOULDBLOCK;
3020 goto defer_buffer_flush;
3027 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO.
3029 * XXX we do this even if we did not previously generate
3030 * a REDO_TRUNC record. This operation may enclosed the
3031 * range for multiple prior truncation entries in the REDO
3034 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR &&
3035 (ip->flags & HAMMER_INODE_RDIRTY)) {
3036 hammer_generate_redo(trans, ip, aligned_trunc_off,
3037 HAMMER_REDO_TERM_TRUNC,
3042 * Clear the truncation flag on the backend after we have
3043 * completed the deletions. Backend data is now good again
3044 * (including new records we are about to sync, below).
3046 * Leave sync_trunc_off intact. As we write additional
3047 * records the backend will update sync_trunc_off. This
3048 * tells the backend whether it can skip the overwrite
3049 * test. This should work properly even when the backend
3050 * writes full blocks where the truncation point straddles
3051 * the block because the comparison is against the base
3052 * offset of the record.
3054 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
3055 /* ip->sync_trunc_off = HAMMER_MAX_KEY; */
3061 * Now sync related records. These will typically be directory
3062 * entries, records tracking direct-writes, or delete-on-disk records.
3065 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
3066 hammer_sync_record_callback, &cursor);
3072 hammer_cache_node(&ip->cache[1], cursor.node);
3075 * Re-seek for inode update, assuming our cache hasn't been ripped
3076 * out from under us.
3079 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error);
3081 hammer_cursor_downgrade(&cursor);
3082 hammer_lock_sh(&tmp_node->lock);
3083 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0)
3084 hammer_cursor_seek(&cursor, tmp_node, 0);
3085 hammer_unlock(&tmp_node->lock);
3086 hammer_rel_node(tmp_node);
3092 * If we are deleting the inode the frontend had better not have
3093 * any active references on elements making up the inode.
3095 * The call to hammer_ip_delete_clean() cleans up auxillary records
3096 * but not DB or DATA records. Those must have already been deleted
3097 * by the normal truncation mechanic.
3099 if (error == 0 && ip->sync_ino_data.nlinks == 0 &&
3100 RB_EMPTY(&ip->rec_tree) &&
3101 (ip->sync_flags & HAMMER_INODE_DELETING) &&
3102 (ip->flags & HAMMER_INODE_DELETED) == 0) {
3105 error = hammer_ip_delete_clean(&cursor, ip, &count1);
3107 ip->flags |= HAMMER_INODE_DELETED;
3108 ip->sync_flags &= ~HAMMER_INODE_DELETING;
3109 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED;
3110 KKASSERT(RB_EMPTY(&ip->rec_tree));
3113 * Set delete_tid in both the frontend and backend
3114 * copy of the inode record. The DELETED flag handles
3115 * this, do not set DDIRTY.
3117 ip->ino_leaf.base.delete_tid = trans->tid;
3118 ip->sync_ino_leaf.base.delete_tid = trans->tid;
3119 ip->ino_leaf.delete_ts = trans->time32;
3120 ip->sync_ino_leaf.delete_ts = trans->time32;
3124 * Adjust the inode count in the volume header
3126 hammer_sync_lock_sh(trans);
3127 if (ip->flags & HAMMER_INODE_ONDISK) {
3128 hammer_modify_volume_field(trans,
3131 --ip->hmp->rootvol->ondisk->vol0_stat_inodes;
3132 hammer_modify_volume_done(trans->rootvol);
3134 hammer_sync_unlock(trans);
3140 ip->sync_flags &= ~HAMMER_INODE_BUFS;
3144 * Now update the inode's on-disk inode-data and/or on-disk record.
3145 * DELETED and ONDISK are managed only in ip->flags.
3147 * In the case of a defered buffer flush we still update the on-disk
3148 * inode to satisfy visibility requirements if there happen to be
3149 * directory dependancies.
3151 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) {
3152 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
3154 * If deleted and on-disk, don't set any additional flags.
3155 * the delete flag takes care of things.
3157 * Clear flags which may have been set by the frontend.
3159 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3160 HAMMER_INODE_SDIRTY |
3161 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3162 HAMMER_INODE_DELETING);
3164 case HAMMER_INODE_DELETED:
3166 * Take care of the case where a deleted inode was never
3167 * flushed to the disk in the first place.
3169 * Clear flags which may have been set by the frontend.
3171 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY |
3172 HAMMER_INODE_SDIRTY |
3173 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME |
3174 HAMMER_INODE_DELETING);
3175 while (RB_ROOT(&ip->rec_tree)) {
3176 hammer_record_t record = RB_ROOT(&ip->rec_tree);
3177 hammer_ref(&record->lock);
3178 KKASSERT(hammer_oneref(&record->lock));
3179 record->flags |= HAMMER_RECF_DELETED_BE;
3180 ++record->ip->rec_generation;
3181 hammer_rel_mem_record(record);
3184 case HAMMER_INODE_ONDISK:
3186 * If already on-disk, do not set any additional flags.
3191 * If not on-disk and not deleted, set DDIRTY to force
3192 * an initial record to be written.
3194 * Also set the create_tid in both the frontend and backend
3195 * copy of the inode record.
3197 ip->ino_leaf.base.create_tid = trans->tid;
3198 ip->ino_leaf.create_ts = trans->time32;
3199 ip->sync_ino_leaf.base.create_tid = trans->tid;
3200 ip->sync_ino_leaf.create_ts = trans->time32;
3201 ip->sync_flags |= HAMMER_INODE_DDIRTY;
3206 * If DDIRTY or SDIRTY is set, write out a new record.
3207 * If the inode is already on-disk the old record is marked as
3210 * If DELETED is set hammer_update_inode() will delete the existing
3211 * record without writing out a new one.
3213 if (ip->flags & HAMMER_INODE_DELETED) {
3214 error = hammer_update_inode(&cursor, ip);
3216 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) &&
3217 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) {
3218 error = hammer_update_itimes(&cursor, ip);
3220 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY |
3221 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
3222 error = hammer_update_inode(&cursor, ip);
3225 if (ip->flags & HAMMER_INODE_MODMASK)
3226 hammer_inode_dirty(ip);
3228 hammer_critical_error(ip->hmp, ip, error,
3229 "while syncing inode");
3231 hammer_done_cursor(&cursor);
3236 * This routine is called when the OS is no longer actively referencing
3237 * the inode (but might still be keeping it cached), or when releasing
3238 * the last reference to an inode.
3240 * At this point if the inode's nlinks count is zero we want to destroy
3241 * it, which may mean destroying it on-media too.
3244 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp)
3249 * Set the DELETING flag when the link count drops to 0 and the
3250 * OS no longer has any opens on the inode.
3252 * The backend will clear DELETING (a mod flag) and set DELETED
3253 * (a state flag) when it is actually able to perform the
3256 * Don't reflag the deletion if the flusher is currently syncing
3257 * one that was already flagged. A previously set DELETING flag
3258 * may bounce around flags and sync_flags until the operation is
3261 * Do not attempt to modify a snapshot inode (one set to read-only).
3263 if (ip->ino_data.nlinks == 0 &&
3264 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_RO|HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) {
3265 ip->flags |= HAMMER_INODE_DELETING;
3266 ip->flags |= HAMMER_INODE_TRUNCATED;
3270 if (hammer_get_vnode(ip, &vp) != 0)
3278 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0, 0);
3279 if (ip->flags & HAMMER_INODE_MODMASK)
3280 hammer_inode_dirty(ip);
3287 * After potentially resolving a dependancy the inode is tested
3288 * to determine whether it needs to be reflushed.
3291 hammer_test_inode(hammer_inode_t ip)
3293 if (ip->flags & HAMMER_INODE_REFLUSH) {
3294 ip->flags &= ~HAMMER_INODE_REFLUSH;
3295 hammer_ref(&ip->lock);
3296 if (ip->flags & HAMMER_INODE_RESIGNAL) {
3297 ip->flags &= ~HAMMER_INODE_RESIGNAL;
3298 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
3300 hammer_flush_inode(ip, 0);
3302 hammer_rel_inode(ip, 0);
3307 * Clear the RECLAIM flag on an inode. This occurs when the inode is
3308 * reassociated with a vp or just before it gets freed.
3310 * Pipeline wakeups to threads blocked due to an excessive number of
3311 * detached inodes. This typically occurs when atime updates accumulate
3312 * while scanning a directory tree.
3315 hammer_inode_wakereclaims(hammer_inode_t ip)
3317 struct hammer_reclaim *reclaim;
3318 hammer_mount_t hmp = ip->hmp;
3320 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0)
3323 --hammer_count_reclaims;
3324 --hmp->count_reclaims;
3325 ip->flags &= ~HAMMER_INODE_RECLAIM;
3327 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) {
3328 KKASSERT(reclaim->count > 0);
3329 if (--reclaim->count == 0) {
3330 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry);
3337 * Setup our reclaim pipeline. We only let so many detached (and dirty)
3338 * inodes build up before we start blocking. This routine is called
3339 * if a new inode is created or an inode is loaded from media.
3341 * When we block we don't care *which* inode has finished reclaiming,
3342 * as long as one does.
3344 * The reclaim pipeline is primarily governed by the auto-flush which is
3345 * 1/4 hammer_limit_reclaims. We don't want to block if the count is
3346 * less than 1/2 hammer_limit_reclaims. From 1/2 to full count is
3347 * dynamically governed.
3350 hammer_inode_waitreclaims(hammer_transaction_t trans)
3352 hammer_mount_t hmp = trans->hmp;
3353 struct hammer_reclaim reclaim;
3357 * Track inode load, delay if the number of reclaiming inodes is
3358 * between 2/4 and 4/4 hammer_limit_reclaims, depending.
3360 if (curthread->td_proc) {
3361 struct hammer_inostats *stats;
3363 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid);
3366 if (stats->count > hammer_limit_reclaims / 2)
3367 stats->count = hammer_limit_reclaims / 2;
3368 lower_limit = hammer_limit_reclaims - stats->count;
3369 if (hammer_debug_general & 0x10000) {
3370 hdkprintf("pid %5d limit %d\n",
3371 (int)curthread->td_proc->p_pid, lower_limit);
3374 lower_limit = hammer_limit_reclaims * 3 / 4;
3376 if (hmp->count_reclaims >= lower_limit) {
3378 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry);
3379 tsleep(&reclaim, 0, "hmrrcm", hz);
3380 if (reclaim.count > 0)
3381 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry);
3386 * Keep track of reclaim statistics on a per-pid basis using a loose
3387 * 4-way set associative hash table. Collisions inherit the count of
3388 * the previous entry.
3390 * NOTE: We want to be careful here to limit the chain size. If the chain
3391 * size is too large a pid will spread its stats out over too many
3392 * entries under certain types of heavy filesystem activity and
3393 * wind up not delaying long enough.
3396 struct hammer_inostats *
3397 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid)
3399 struct hammer_inostats *stats;
3402 static volatile int iterator; /* we don't care about MP races */
3405 * Chain up to 4 times to find our entry.
3407 for (chain = 0; chain < 4; ++chain) {
3408 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK];
3409 if (stats->pid == pid)
3414 * Replace one of the four chaining entries with our new entry.
3417 stats = &hmp->inostats[(pid + (iterator++ & 3)) &
3418 HAMMER_INOSTATS_HMASK];
3425 if (stats->count && stats->ltick != ticks) {
3426 delta = ticks - stats->ltick;
3427 stats->ltick = ticks;
3428 if (delta <= 0 || delta > hz * 60)
3431 stats->count = stats->count * hz / (hz + delta);
3433 if (hammer_debug_general & 0x10000)
3434 hdkprintf("pid %5d stats %d\n", (int)pid, stats->count);
3441 * XXX not used, doesn't work very well due to the large batching nature
3444 * A larger then normal backlog of inodes is sitting in the flusher,
3445 * enforce a general slowdown to let it catch up. This routine is only
3446 * called on completion of a non-flusher-related transaction which
3447 * performed B-Tree node I/O.
3449 * It is possible for the flusher to stall in a continuous load.
3450 * blogbench -i1000 -o seems to do a good job generating this sort of load.
3451 * If the flusher is unable to catch up the inode count can bloat until
3452 * we run out of kvm.
3454 * This is a bit of a hack.
3457 hammer_inode_waithard(hammer_mount_t hmp)
3462 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) {
3463 if (hmp->count_reclaims < hammer_limit_reclaims / 2 &&
3464 hmp->count_iqueued < hmp->count_inodes / 20) {
3465 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY;
3469 if (hmp->count_reclaims < hammer_limit_reclaims ||
3470 hmp->count_iqueued < hmp->count_inodes / 10) {
3473 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY;
3477 * Block for one flush cycle.
3479 hammer_flusher_wait_next(hmp);