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
));
364 * Interlock vnode clearing. This does not prevent the
365 * vnode from going into a reclaimed state but it does
366 * prevent it from being destroyed or reused so the vget()
367 * will properly fail.
369 hammer_lock_ex(&ip
->lock
);
370 if ((vp
= ip
->vp
) == NULL
) {
371 hammer_unlock(&ip
->lock
);
375 hammer_unlock(&ip
->lock
);
378 * loop if the vget fails (aka races), or if the vp
379 * no longer matches ip->vp.
381 if (vget(vp
, LK_EXCLUSIVE
) == 0) {
395 * Locate all copies of the inode for obj_id compatible with the specified
396 * asof, reference, and issue the related call-back. This routine is used
397 * for direct-io invalidation and does not create any new inodes.
400 hammer_scan_inode_snapshots(hammer_mount_t hmp
, hammer_inode_info_t iinfo
,
401 int (*callback
)(hammer_inode_t ip
, void *data
),
404 hammer_ino_rb_tree_RB_SCAN(&hmp
->rb_inos_root
,
405 hammer_inode_info_cmp_all_history
,
410 * Acquire a HAMMER inode. The returned inode is not locked. These functions
411 * do not attach or detach the related vnode (use hammer_get_vnode() for
414 * The flags argument is only applied for newly created inodes, and only
415 * certain flags are inherited.
417 * Called from the frontend.
420 hammer_get_inode(hammer_transaction_t trans
, hammer_inode_t dip
,
421 int64_t obj_id
, hammer_tid_t asof
, uint32_t localization
,
422 int flags
, int *errorp
)
424 hammer_mount_t hmp
= trans
->hmp
;
425 struct hammer_node_cache
*cachep
;
426 struct hammer_cursor cursor
;
431 * Determine if we already have an inode cached. If we do then
434 * If we find an inode with no vnode we have to mark the
435 * transaction such that hammer_inode_waitreclaims() is
436 * called later on to avoid building up an infinite number
437 * of inodes. Otherwise we can continue to * add new inodes
438 * faster then they can be disposed of, even with the tsleep
441 * If we find a dummy inode we return a failure so dounlink
442 * (which does another lookup) doesn't try to mess with the
443 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode()
444 * to ref dummy inodes.
448 ip
= __hammer_find_inode(trans
, obj_id
, asof
, localization
);
450 if (ip
->flags
& HAMMER_INODE_DUMMY
) {
454 hammer_ref(&ip
->lock
);
459 * Allocate a new inode structure and deal with races later.
461 ip
= kmalloc(sizeof(*ip
), hmp
->m_inodes
, M_WAITOK
|M_ZERO
);
462 ++hammer_count_inodes
;
466 ip
->obj_localization
= localization
;
468 ip
->flags
= flags
& HAMMER_INODE_RO
;
469 ip
->cache
[0].ip
= ip
;
470 ip
->cache
[1].ip
= ip
;
471 ip
->cache
[2].ip
= ip
;
472 ip
->cache
[3].ip
= ip
;
474 ip
->flags
|= HAMMER_INODE_RO
;
475 ip
->sync_trunc_off
= ip
->trunc_off
= ip
->save_trunc_off
=
477 RB_INIT(&ip
->rec_tree
);
478 TAILQ_INIT(&ip
->target_list
);
479 hammer_ref(&ip
->lock
);
482 * Locate the on-disk inode. If this is a PFS root we always
483 * access the current version of the root inode and (if it is not
484 * a master) always access information under it with a snapshot
487 * We cache recent inode lookups in this directory in dip->cache[2].
488 * If we can't find it we assume the inode we are looking for is
489 * close to the directory inode.
494 if (dip
->cache
[2].node
)
495 cachep
= &dip
->cache
[2];
497 cachep
= &dip
->cache
[0];
499 hammer_init_cursor(trans
, &cursor
, cachep
, NULL
);
500 cursor
.key_beg
.localization
= localization
| HAMMER_LOCALIZE_INODE
;
501 cursor
.key_beg
.obj_id
= ip
->obj_id
;
502 cursor
.key_beg
.key
= 0;
503 cursor
.key_beg
.create_tid
= 0;
504 cursor
.key_beg
.delete_tid
= 0;
505 cursor
.key_beg
.rec_type
= HAMMER_RECTYPE_INODE
;
506 cursor
.key_beg
.obj_type
= 0;
509 cursor
.flags
= HAMMER_CURSOR_GET_DATA
| HAMMER_CURSOR_ASOF
;
511 *errorp
= hammer_btree_lookup(&cursor
);
512 if (*errorp
== EDEADLK
) {
513 hammer_done_cursor(&cursor
);
518 * On success the B-Tree lookup will hold the appropriate
519 * buffer cache buffers and provide a pointer to the requested
520 * information. Copy the information to the in-memory inode
521 * and cache the B-Tree node to improve future operations.
524 ip
->ino_leaf
= cursor
.node
->ondisk
->elms
[cursor
.index
].leaf
;
525 ip
->ino_data
= cursor
.data
->inode
;
528 * cache[0] tries to cache the location of the object inode.
529 * The assumption is that it is near the directory inode.
531 * cache[1] tries to cache the location of the object data.
532 * We might have something in the governing directory from
533 * scan optimizations (see the strategy code in
536 * We update dip->cache[2], if possible, with the location
537 * of the object inode for future directory shortcuts.
539 hammer_cache_node(&ip
->cache
[0], cursor
.node
);
541 if (dip
->cache
[3].node
) {
542 hammer_cache_node(&ip
->cache
[1],
545 hammer_cache_node(&dip
->cache
[2], cursor
.node
);
549 * The file should not contain any data past the file size
550 * stored in the inode. Setting save_trunc_off to the
551 * file size instead of max reduces B-Tree lookup overheads
552 * on append by allowing the flusher to avoid checking for
555 ip
->save_trunc_off
= ip
->ino_data
.size
;
558 * Locate and assign the pseudofs management structure to
561 if (dip
&& dip
->obj_localization
== ip
->obj_localization
) {
562 ip
->pfsm
= dip
->pfsm
;
563 hammer_ref(&ip
->pfsm
->lock
);
565 ip
->pfsm
= hammer_load_pseudofs(trans
,
566 ip
->obj_localization
,
568 *errorp
= 0; /* ignore ENOENT */
573 * The inode is placed on the red-black tree and will be synced to
574 * the media when flushed or by the filesystem sync. If this races
575 * another instantiation/lookup the insertion will fail.
578 if (RB_INSERT(hammer_ino_rb_tree
, &hmp
->rb_inos_root
, ip
)) {
579 hammer_free_inode(ip
);
580 hammer_done_cursor(&cursor
);
583 ip
->flags
|= HAMMER_INODE_ONDISK
;
585 if (ip
->flags
& HAMMER_INODE_RSV_INODES
) {
586 ip
->flags
&= ~HAMMER_INODE_RSV_INODES
; /* sanity */
590 hammer_free_inode(ip
);
593 hammer_done_cursor(&cursor
);
596 * NEWINODE is only set if the inode becomes dirty later,
597 * setting it here just leads to unnecessary stalls.
599 * trans->flags |= HAMMER_TRANSF_NEWINODE;
605 * Get a dummy inode to placemark a broken directory entry.
608 hammer_get_dummy_inode(hammer_transaction_t trans
, hammer_inode_t dip
,
609 int64_t obj_id
, hammer_tid_t asof
, uint32_t localization
,
610 int flags
, int *errorp
)
612 hammer_mount_t hmp
= trans
->hmp
;
616 * Determine if we already have an inode cached. If we do then
619 * If we find an inode with no vnode we have to mark the
620 * transaction such that hammer_inode_waitreclaims() is
621 * called later on to avoid building up an infinite number
622 * of inodes. Otherwise we can continue to * add new inodes
623 * faster then they can be disposed of, even with the tsleep
626 * If we find a non-fake inode we return an error. Only fake
627 * inodes can be returned by this routine.
631 ip
= __hammer_find_inode(trans
, obj_id
, asof
, localization
);
633 if ((ip
->flags
& HAMMER_INODE_DUMMY
) == 0) {
637 hammer_ref(&ip
->lock
);
642 * Allocate a new inode structure and deal with races later.
644 ip
= kmalloc(sizeof(*ip
), hmp
->m_inodes
, M_WAITOK
|M_ZERO
);
645 ++hammer_count_inodes
;
649 ip
->obj_localization
= localization
;
651 ip
->flags
= flags
| HAMMER_INODE_RO
| HAMMER_INODE_DUMMY
;
652 ip
->cache
[0].ip
= ip
;
653 ip
->cache
[1].ip
= ip
;
654 ip
->cache
[2].ip
= ip
;
655 ip
->cache
[3].ip
= ip
;
656 ip
->sync_trunc_off
= ip
->trunc_off
= ip
->save_trunc_off
=
658 RB_INIT(&ip
->rec_tree
);
659 TAILQ_INIT(&ip
->target_list
);
660 hammer_ref(&ip
->lock
);
663 * Populate the dummy inode. Leave everything zero'd out.
665 * (ip->ino_leaf and ip->ino_data)
667 * Make the dummy inode a FIFO object which most copy programs
668 * will properly ignore.
670 ip
->save_trunc_off
= ip
->ino_data
.size
;
671 ip
->ino_data
.obj_type
= HAMMER_OBJTYPE_FIFO
;
674 * Locate and assign the pseudofs management structure to
677 if (dip
&& dip
->obj_localization
== ip
->obj_localization
) {
678 ip
->pfsm
= dip
->pfsm
;
679 hammer_ref(&ip
->pfsm
->lock
);
681 ip
->pfsm
= hammer_load_pseudofs(trans
, ip
->obj_localization
,
683 *errorp
= 0; /* ignore ENOENT */
687 * The inode is placed on the red-black tree and will be synced to
688 * the media when flushed or by the filesystem sync. If this races
689 * another instantiation/lookup the insertion will fail.
691 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake.
694 if (RB_INSERT(hammer_ino_rb_tree
, &hmp
->rb_inos_root
, ip
)) {
695 hammer_free_inode(ip
);
699 if (ip
->flags
& HAMMER_INODE_RSV_INODES
) {
700 ip
->flags
&= ~HAMMER_INODE_RSV_INODES
; /* sanity */
703 hammer_free_inode(ip
);
706 trans
->flags
|= HAMMER_TRANSF_NEWINODE
;
711 * Return a referenced inode only if it is in our inode cache.
712 * Dummy inodes do not count.
715 hammer_find_inode(hammer_transaction_t trans
, int64_t obj_id
,
716 hammer_tid_t asof
, uint32_t localization
)
720 ip
= __hammer_find_inode(trans
, obj_id
, asof
, localization
);
722 if (ip
->flags
& HAMMER_INODE_DUMMY
)
725 hammer_ref(&ip
->lock
);
731 * Return a referenced inode only if it is in our inode cache.
732 * This function does not reference inode.
734 static hammer_inode_t
735 __hammer_find_inode(hammer_transaction_t trans
, int64_t obj_id
,
736 hammer_tid_t asof
, uint32_t localization
)
738 hammer_mount_t hmp
= trans
->hmp
;
739 struct hammer_inode_info iinfo
;
742 iinfo
.obj_id
= obj_id
;
743 iinfo
.obj_asof
= asof
;
744 iinfo
.obj_localization
= localization
;
746 ip
= hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp
->rb_inos_root
, &iinfo
);
752 * Create a new filesystem object, returning the inode in *ipp. The
753 * returned inode will be referenced. The inode is created in-memory.
755 * If pfsm is non-NULL the caller wishes to create the root inode for
759 hammer_create_inode(hammer_transaction_t trans
, struct vattr
*vap
,
761 hammer_inode_t dip
, const char *name
, int namelen
,
762 hammer_pseudofs_inmem_t pfsm
, hammer_inode_t
*ipp
)
774 * Disallow the creation of new inodes in directories which
775 * have been deleted. In HAMMER, this will cause a record
776 * syncing assertion later on in the flush code.
778 if (dip
&& dip
->ino_data
.nlinks
== 0) {
786 ip
= kmalloc(sizeof(*ip
), hmp
->m_inodes
, M_WAITOK
|M_ZERO
);
787 ++hammer_count_inodes
;
789 trans
->flags
|= HAMMER_TRANSF_NEWINODE
;
792 KKASSERT(pfsm
->localization
!= HAMMER_DEF_LOCALIZATION
);
793 ip
->obj_id
= HAMMER_OBJID_ROOT
;
794 ip
->obj_localization
= pfsm
->localization
;
796 KKASSERT(dip
!= NULL
);
797 namekey
= hammer_direntry_namekey(dip
, name
, namelen
, &dummy
);
798 ip
->obj_id
= hammer_alloc_objid(hmp
, dip
, namekey
);
799 ip
->obj_localization
= dip
->obj_localization
;
802 KKASSERT(ip
->obj_id
!= 0);
803 ip
->obj_asof
= hmp
->asof
;
805 ip
->flush_state
= HAMMER_FST_IDLE
;
806 ip
->flags
= HAMMER_INODE_DDIRTY
|
807 HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
;
808 ip
->cache
[0].ip
= ip
;
809 ip
->cache
[1].ip
= ip
;
810 ip
->cache
[2].ip
= ip
;
811 ip
->cache
[3].ip
= ip
;
813 ip
->trunc_off
= HAMMER_MAX_KEY
;
814 /* ip->save_trunc_off = 0; (already zero) */
815 RB_INIT(&ip
->rec_tree
);
816 TAILQ_INIT(&ip
->target_list
);
818 ip
->ino_data
.atime
= trans
->time
;
819 ip
->ino_data
.mtime
= trans
->time
;
820 ip
->ino_data
.size
= 0;
821 ip
->ino_data
.nlinks
= 0;
824 * A nohistory designator on the parent directory is inherited by
825 * the child. We will do this even for pseudo-fs creation... the
826 * sysad can turn it off.
829 ip
->ino_data
.uflags
= dip
->ino_data
.uflags
&
830 (SF_NOHISTORY
|UF_NOHISTORY
|UF_NODUMP
);
833 ip
->ino_leaf
.base
.btype
= HAMMER_BTREE_TYPE_RECORD
;
834 ip
->ino_leaf
.base
.localization
= ip
->obj_localization
|
835 HAMMER_LOCALIZE_INODE
;
836 ip
->ino_leaf
.base
.obj_id
= ip
->obj_id
;
837 ip
->ino_leaf
.base
.key
= 0;
838 ip
->ino_leaf
.base
.create_tid
= 0;
839 ip
->ino_leaf
.base
.delete_tid
= 0;
840 ip
->ino_leaf
.base
.rec_type
= HAMMER_RECTYPE_INODE
;
841 ip
->ino_leaf
.base
.obj_type
= hammer_get_obj_type(vap
->va_type
);
843 ip
->ino_data
.obj_type
= ip
->ino_leaf
.base
.obj_type
;
844 ip
->ino_data
.version
= HAMMER_INODE_DATA_VERSION
;
845 ip
->ino_data
.mode
= vap
->va_mode
;
846 ip
->ino_data
.ctime
= trans
->time
;
849 * If we are running version 2 or greater directory entries are
850 * inode-localized instead of data-localized.
852 if (trans
->hmp
->version
>= HAMMER_VOL_VERSION_TWO
) {
853 if (ip
->ino_leaf
.base
.obj_type
== HAMMER_OBJTYPE_DIRECTORY
) {
854 ip
->ino_data
.cap_flags
|=
855 HAMMER_INODE_CAP_DIR_LOCAL_INO
;
858 if (trans
->hmp
->version
>= HAMMER_VOL_VERSION_SIX
) {
859 if (ip
->ino_leaf
.base
.obj_type
== HAMMER_OBJTYPE_DIRECTORY
) {
860 ip
->ino_data
.cap_flags
|=
861 HAMMER_INODE_CAP_DIRHASH_ALG1
;
866 * Setup the ".." pointer. This only needs to be done for directories
867 * but we do it for all objects as a recovery aid if dip exists.
868 * The inode is probably a PFS root if dip is NULL.
871 ip
->ino_data
.parent_obj_id
= dip
->ino_leaf
.base
.obj_id
;
873 switch(ip
->ino_leaf
.base
.obj_type
) {
874 case HAMMER_OBJTYPE_CDEV
:
875 case HAMMER_OBJTYPE_BDEV
:
876 ip
->ino_data
.rmajor
= vap
->va_rmajor
;
877 ip
->ino_data
.rminor
= vap
->va_rminor
;
884 * Calculate default uid/gid and overwrite with information from
888 xuid
= hammer_to_unix_xid(&dip
->ino_data
.uid
);
889 xuid
= vop_helper_create_uid(hmp
->mp
, dip
->ino_data
.mode
,
890 xuid
, cred
, &vap
->va_mode
);
894 ip
->ino_data
.mode
= vap
->va_mode
;
896 if (vap
->va_vaflags
& VA_UID_UUID_VALID
)
897 ip
->ino_data
.uid
= vap
->va_uid_uuid
;
898 else if (vap
->va_uid
!= (uid_t
)VNOVAL
)
899 hammer_guid_to_uuid(&ip
->ino_data
.uid
, vap
->va_uid
);
901 hammer_guid_to_uuid(&ip
->ino_data
.uid
, xuid
);
903 if (vap
->va_vaflags
& VA_GID_UUID_VALID
)
904 ip
->ino_data
.gid
= vap
->va_gid_uuid
;
905 else if (vap
->va_gid
!= (gid_t
)VNOVAL
)
906 hammer_guid_to_uuid(&ip
->ino_data
.gid
, vap
->va_gid
);
908 ip
->ino_data
.gid
= dip
->ino_data
.gid
;
910 hammer_ref(&ip
->lock
);
914 hammer_ref(&pfsm
->lock
);
916 } else if (dip
->obj_localization
== ip
->obj_localization
) {
917 ip
->pfsm
= dip
->pfsm
;
918 hammer_ref(&ip
->pfsm
->lock
);
921 ip
->pfsm
= hammer_load_pseudofs(trans
,
922 ip
->obj_localization
,
924 error
= 0; /* ignore ENOENT */
928 hammer_free_inode(ip
);
930 } else if (RB_INSERT(hammer_ino_rb_tree
, &hmp
->rb_inos_root
, ip
)) {
931 hpanic("duplicate obj_id %jx", (intmax_t)ip
->obj_id
);
933 hammer_free_inode(ip
);
940 * Final cleanup / freeing of an inode structure
943 hammer_free_inode(hammer_inode_t ip
)
948 KKASSERT(hammer_oneref(&ip
->lock
));
949 hammer_uncache_node(&ip
->cache
[0]);
950 hammer_uncache_node(&ip
->cache
[1]);
951 hammer_uncache_node(&ip
->cache
[2]);
952 hammer_uncache_node(&ip
->cache
[3]);
953 hammer_inode_wakereclaims(ip
);
955 hammer_clear_objid(ip
);
956 --hammer_count_inodes
;
959 hammer_rel_pseudofs(hmp
, ip
->pfsm
);
962 kfree(ip
, hmp
->m_inodes
);
966 * Retrieve pseudo-fs data. NULL will never be returned.
968 * If an error occurs *errorp will be set and a default template is returned,
969 * otherwise *errorp is set to 0. Typically when an error occurs it will
972 hammer_pseudofs_inmem_t
973 hammer_load_pseudofs(hammer_transaction_t trans
,
974 uint32_t localization
, int *errorp
)
976 hammer_mount_t hmp
= trans
->hmp
;
978 hammer_pseudofs_inmem_t pfsm
;
979 struct hammer_cursor cursor
;
983 pfsm
= RB_LOOKUP(hammer_pfs_rb_tree
, &hmp
->rb_pfsm_root
, localization
);
985 hammer_ref(&pfsm
->lock
);
991 * PFS records are associated with the root inode (not the PFS root
992 * inode, but the real root). Avoid an infinite recursion if loading
993 * the PFS for the real root.
996 ip
= hammer_get_inode(trans
, NULL
, HAMMER_OBJID_ROOT
,
998 HAMMER_DEF_LOCALIZATION
, 0, errorp
);
1003 pfsm
= kmalloc(sizeof(*pfsm
), hmp
->m_misc
, M_WAITOK
| M_ZERO
);
1004 pfsm
->localization
= localization
;
1005 pfsm
->pfsd
.unique_uuid
= trans
->rootvol
->ondisk
->vol_fsid
;
1006 pfsm
->pfsd
.shared_uuid
= pfsm
->pfsd
.unique_uuid
;
1008 hammer_init_cursor(trans
, &cursor
, (ip
? &ip
->cache
[1] : NULL
), ip
);
1009 cursor
.key_beg
.localization
= HAMMER_DEF_LOCALIZATION
|
1010 HAMMER_LOCALIZE_MISC
;
1011 cursor
.key_beg
.obj_id
= HAMMER_OBJID_ROOT
;
1012 cursor
.key_beg
.create_tid
= 0;
1013 cursor
.key_beg
.delete_tid
= 0;
1014 cursor
.key_beg
.rec_type
= HAMMER_RECTYPE_PFS
;
1015 cursor
.key_beg
.obj_type
= 0;
1016 cursor
.key_beg
.key
= localization
;
1017 cursor
.asof
= HAMMER_MAX_TID
;
1018 cursor
.flags
|= HAMMER_CURSOR_ASOF
;
1021 *errorp
= hammer_ip_lookup(&cursor
);
1023 *errorp
= hammer_btree_lookup(&cursor
);
1025 *errorp
= hammer_ip_resolve_data(&cursor
);
1027 if (hammer_is_pfs_deleted(&cursor
.data
->pfsd
)) {
1030 bytes
= cursor
.leaf
->data_len
;
1031 if (bytes
> sizeof(pfsm
->pfsd
))
1032 bytes
= sizeof(pfsm
->pfsd
);
1033 bcopy(cursor
.data
, &pfsm
->pfsd
, bytes
);
1037 hammer_done_cursor(&cursor
);
1039 pfsm
->fsid_udev
= hammer_fsid_to_udev(&pfsm
->pfsd
.shared_uuid
);
1040 hammer_ref(&pfsm
->lock
);
1042 hammer_rel_inode(ip
, 0);
1043 if (RB_INSERT(hammer_pfs_rb_tree
, &hmp
->rb_pfsm_root
, pfsm
)) {
1044 kfree(pfsm
, hmp
->m_misc
);
1051 * Store pseudo-fs data. The backend will automatically delete any prior
1052 * on-disk pseudo-fs data but we have to delete in-memory versions.
1055 hammer_save_pseudofs(hammer_transaction_t trans
, hammer_pseudofs_inmem_t pfsm
)
1057 struct hammer_cursor cursor
;
1058 hammer_record_t record
;
1063 * PFS records are associated with the root inode (not the PFS root
1064 * inode, but the real root).
1066 ip
= hammer_get_inode(trans
, NULL
, HAMMER_OBJID_ROOT
, HAMMER_MAX_TID
,
1067 HAMMER_DEF_LOCALIZATION
, 0, &error
);
1069 pfsm
->fsid_udev
= hammer_fsid_to_udev(&pfsm
->pfsd
.shared_uuid
);
1070 hammer_init_cursor(trans
, &cursor
, &ip
->cache
[1], ip
);
1071 cursor
.key_beg
.localization
= ip
->obj_localization
|
1072 HAMMER_LOCALIZE_MISC
;
1073 cursor
.key_beg
.obj_id
= HAMMER_OBJID_ROOT
;
1074 cursor
.key_beg
.create_tid
= 0;
1075 cursor
.key_beg
.delete_tid
= 0;
1076 cursor
.key_beg
.rec_type
= HAMMER_RECTYPE_PFS
;
1077 cursor
.key_beg
.obj_type
= 0;
1078 cursor
.key_beg
.key
= pfsm
->localization
;
1079 cursor
.asof
= HAMMER_MAX_TID
;
1080 cursor
.flags
|= HAMMER_CURSOR_ASOF
;
1083 * Replace any in-memory version of the record.
1085 error
= hammer_ip_lookup(&cursor
);
1086 if (error
== 0 && hammer_cursor_inmem(&cursor
)) {
1087 record
= cursor
.iprec
;
1088 if (record
->flags
& HAMMER_RECF_INTERLOCK_BE
) {
1089 KKASSERT(cursor
.deadlk_rec
== NULL
);
1090 hammer_ref(&record
->lock
);
1091 cursor
.deadlk_rec
= record
;
1094 record
->flags
|= HAMMER_RECF_DELETED_FE
;
1100 * Allocate replacement general record. The backend flush will
1101 * delete any on-disk version of the record.
1103 if (error
== 0 || error
== ENOENT
) {
1104 record
= hammer_alloc_mem_record(ip
, sizeof(pfsm
->pfsd
));
1105 record
->type
= HAMMER_MEM_RECORD_GENERAL
;
1107 record
->leaf
.base
.localization
= ip
->obj_localization
|
1108 HAMMER_LOCALIZE_MISC
;
1109 record
->leaf
.base
.rec_type
= HAMMER_RECTYPE_PFS
;
1110 record
->leaf
.base
.key
= pfsm
->localization
;
1111 record
->leaf
.data_len
= sizeof(pfsm
->pfsd
);
1112 bcopy(&pfsm
->pfsd
, record
->data
, sizeof(pfsm
->pfsd
));
1113 error
= hammer_ip_add_record(trans
, record
);
1115 hammer_done_cursor(&cursor
);
1116 if (error
== EDEADLK
)
1118 hammer_rel_inode(ip
, 0);
1123 * Create a root directory for a PFS if one does not alredy exist.
1125 * The PFS root stands alone so we must also bump the nlinks count
1126 * to prevent it from being destroyed on release.
1128 * Make sure a caller isn't creating a PFS from non-root PFS.
1131 hammer_mkroot_pseudofs(hammer_transaction_t trans
, struct ucred
*cred
,
1132 hammer_pseudofs_inmem_t pfsm
, hammer_inode_t dip
)
1138 ip
= hammer_get_inode(trans
, NULL
, HAMMER_OBJID_ROOT
, HAMMER_MAX_TID
,
1139 pfsm
->localization
, 0, &error
);
1141 if (lo_to_pfs(dip
->obj_localization
) != HAMMER_ROOT_PFSID
) {
1142 hmkprintf(trans
->hmp
,
1143 "Warning: creating a PFS from non-root PFS "
1144 "is not allowed\n");
1150 error
= hammer_create_inode(trans
, &vap
, cred
,
1154 ++ip
->ino_data
.nlinks
;
1155 hammer_modify_inode(trans
, ip
, HAMMER_INODE_DDIRTY
);
1159 hammer_rel_inode(ip
, 0);
1164 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY
1165 * if we are unable to disassociate all the inodes.
1169 hammer_unload_pseudofs_callback(hammer_inode_t ip
, void *data
)
1173 hammer_ref(&ip
->lock
);
1174 if (ip
->vp
&& (ip
->vp
->v_flag
& VPFSROOT
)) {
1176 * The hammer pfs-upgrade directive itself might have the
1177 * root of the pfs open. Just allow it.
1182 * Don't allow any subdirectories or files to be open.
1184 if (hammer_isactive(&ip
->lock
) == 2 && ip
->vp
)
1185 vclean_unlocked(ip
->vp
); /* might not succeed */
1186 if (hammer_isactive(&ip
->lock
) == 1 && ip
->vp
== NULL
)
1189 res
= -1; /* stop, someone is using the inode */
1191 hammer_rel_inode(ip
, 0);
1196 hammer_unload_pseudofs(hammer_transaction_t trans
, uint32_t localization
)
1201 for (try = res
= 0; try < 4; ++try) {
1202 res
= hammer_ino_rb_tree_RB_SCAN(&trans
->hmp
->rb_inos_root
,
1203 hammer_inode_pfs_cmp
,
1204 hammer_unload_pseudofs_callback
,
1206 if (res
== 0 && try > 1)
1208 hammer_flusher_sync(trans
->hmp
);
1217 * Release a reference on a PFS
1220 hammer_rel_pseudofs(hammer_mount_t hmp
, hammer_pseudofs_inmem_t pfsm
)
1222 hammer_rel(&pfsm
->lock
);
1223 if (hammer_norefs(&pfsm
->lock
)) {
1224 RB_REMOVE(hammer_pfs_rb_tree
, &hmp
->rb_pfsm_root
, pfsm
);
1225 kfree(pfsm
, hmp
->m_misc
);
1230 * Called by hammer_sync_inode().
1233 hammer_update_inode(hammer_cursor_t cursor
, hammer_inode_t ip
)
1235 hammer_transaction_t trans
= cursor
->trans
;
1236 hammer_record_t record
;
1244 * If the inode has a presence on-disk then locate it and mark
1245 * it deleted, setting DELONDISK.
1247 * The record may or may not be physically deleted, depending on
1248 * the retention policy.
1250 if ((ip
->flags
& (HAMMER_INODE_ONDISK
|HAMMER_INODE_DELONDISK
)) ==
1251 HAMMER_INODE_ONDISK
) {
1252 hammer_normalize_cursor(cursor
);
1253 cursor
->key_beg
.localization
= ip
->obj_localization
|
1254 HAMMER_LOCALIZE_INODE
;
1255 cursor
->key_beg
.obj_id
= ip
->obj_id
;
1256 cursor
->key_beg
.key
= 0;
1257 cursor
->key_beg
.create_tid
= 0;
1258 cursor
->key_beg
.delete_tid
= 0;
1259 cursor
->key_beg
.rec_type
= HAMMER_RECTYPE_INODE
;
1260 cursor
->key_beg
.obj_type
= 0;
1261 cursor
->asof
= ip
->obj_asof
;
1262 cursor
->flags
&= ~HAMMER_CURSOR_INITMASK
;
1263 cursor
->flags
|= HAMMER_CURSOR_ASOF
;
1264 cursor
->flags
|= HAMMER_CURSOR_BACKEND
;
1266 error
= hammer_btree_lookup(cursor
);
1267 if (hammer_debug_inode
)
1268 hdkprintf("IPDEL %p %08x %d\n", ip
, ip
->flags
, error
);
1271 error
= hammer_ip_delete_record(cursor
, ip
, trans
->tid
);
1272 if (hammer_debug_inode
)
1273 hdkprintf("error %d\n", error
);
1275 ip
->flags
|= HAMMER_INODE_DELONDISK
;
1278 hammer_cache_node(&ip
->cache
[0], cursor
->node
);
1280 if (error
== EDEADLK
) {
1281 hammer_done_cursor(cursor
);
1282 error
= hammer_init_cursor(trans
, cursor
,
1284 if (hammer_debug_inode
)
1285 hdkprintf("IPDED %p %d\n", ip
, error
);
1292 * Ok, write out the initial record or a new record (after deleting
1293 * the old one), unless the DELETED flag is set. This routine will
1294 * clear DELONDISK if it writes out a record.
1296 * Update our inode statistics if this is the first application of
1297 * the inode on-disk.
1299 if (error
== 0 && (ip
->flags
& HAMMER_INODE_DELETED
) == 0) {
1301 * Generate a record and write it to the media. We clean-up
1302 * the state before releasing so we do not have to set-up
1305 record
= hammer_alloc_mem_record(ip
, 0);
1306 record
->type
= HAMMER_MEM_RECORD_INODE
;
1307 record
->flush_state
= HAMMER_FST_FLUSH
;
1308 record
->leaf
= ip
->sync_ino_leaf
;
1309 record
->leaf
.base
.create_tid
= trans
->tid
;
1310 record
->leaf
.data_len
= sizeof(ip
->sync_ino_data
);
1311 record
->leaf
.create_ts
= trans
->time32
;
1312 record
->data
= (void *)&ip
->sync_ino_data
;
1313 record
->flags
|= HAMMER_RECF_INTERLOCK_BE
;
1316 * If this flag is set we cannot sync the new file size
1317 * because we haven't finished related truncations. The
1318 * inode will be flushed in another flush group to finish
1321 if ((ip
->flags
& HAMMER_INODE_WOULDBLOCK
) &&
1322 ip
->sync_ino_data
.size
!= ip
->ino_data
.size
) {
1324 ip
->sync_ino_data
.size
= ip
->ino_data
.size
;
1330 error
= hammer_ip_sync_record_cursor(cursor
, record
);
1331 if (hammer_debug_inode
)
1332 hdkprintf("GENREC %p rec %08x %d\n",
1333 ip
, record
->flags
, error
);
1334 if (error
!= EDEADLK
)
1336 hammer_done_cursor(cursor
);
1337 error
= hammer_init_cursor(trans
, cursor
,
1339 if (hammer_debug_inode
)
1340 hdkprintf("GENREC reinit %d\n", error
);
1346 * Note: The record was never on the inode's record tree
1347 * so just wave our hands importantly and destroy it.
1349 record
->flags
|= HAMMER_RECF_COMMITTED
;
1350 record
->flags
&= ~HAMMER_RECF_INTERLOCK_BE
;
1351 record
->flush_state
= HAMMER_FST_IDLE
;
1352 ++ip
->rec_generation
;
1353 hammer_rel_mem_record(record
);
1359 if (hammer_debug_inode
)
1360 hdkprintf("CLEANDELOND %p %08x\n", ip
, ip
->flags
);
1361 ip
->sync_flags
&= ~(HAMMER_INODE_DDIRTY
|
1362 HAMMER_INODE_SDIRTY
|
1363 HAMMER_INODE_ATIME
|
1364 HAMMER_INODE_MTIME
);
1365 ip
->flags
&= ~HAMMER_INODE_DELONDISK
;
1367 ip
->sync_flags
|= HAMMER_INODE_DDIRTY
;
1370 * Root volume count of inodes
1372 hammer_sync_lock_sh(trans
);
1373 if ((ip
->flags
& HAMMER_INODE_ONDISK
) == 0) {
1374 hammer_modify_volume_field(trans
,
1377 ++ip
->hmp
->rootvol
->ondisk
->vol0_stat_inodes
;
1378 hammer_modify_volume_done(trans
->rootvol
);
1379 ip
->flags
|= HAMMER_INODE_ONDISK
;
1380 if (hammer_debug_inode
)
1381 hdkprintf("NOWONDISK %p\n", ip
);
1383 hammer_sync_unlock(trans
);
1388 * If the inode has been destroyed, clean out any left-over flags
1389 * that may have been set by the frontend.
1391 if (error
== 0 && (ip
->flags
& HAMMER_INODE_DELETED
)) {
1392 ip
->sync_flags
&= ~(HAMMER_INODE_DDIRTY
|
1393 HAMMER_INODE_SDIRTY
|
1394 HAMMER_INODE_ATIME
|
1395 HAMMER_INODE_MTIME
);
1401 * Update only the itimes fields.
1403 * ATIME can be updated without generating any UNDO. MTIME is updated
1404 * with UNDO so it is guaranteed to be synchronized properly in case of
1407 * Neither field is included in the B-Tree leaf element's CRC, which is how
1408 * we can get away with updating ATIME the way we do.
1411 hammer_update_itimes(hammer_cursor_t cursor
, hammer_inode_t ip
)
1413 hammer_transaction_t trans
= cursor
->trans
;
1417 if ((ip
->flags
& (HAMMER_INODE_ONDISK
|HAMMER_INODE_DELONDISK
)) !=
1418 HAMMER_INODE_ONDISK
) {
1422 hammer_normalize_cursor(cursor
);
1423 cursor
->key_beg
.localization
= ip
->obj_localization
|
1424 HAMMER_LOCALIZE_INODE
;
1425 cursor
->key_beg
.obj_id
= ip
->obj_id
;
1426 cursor
->key_beg
.key
= 0;
1427 cursor
->key_beg
.create_tid
= 0;
1428 cursor
->key_beg
.delete_tid
= 0;
1429 cursor
->key_beg
.rec_type
= HAMMER_RECTYPE_INODE
;
1430 cursor
->key_beg
.obj_type
= 0;
1431 cursor
->asof
= ip
->obj_asof
;
1432 cursor
->flags
&= ~HAMMER_CURSOR_INITMASK
;
1433 cursor
->flags
|= HAMMER_CURSOR_ASOF
;
1434 cursor
->flags
|= HAMMER_CURSOR_GET_DATA
;
1435 cursor
->flags
|= HAMMER_CURSOR_BACKEND
;
1437 error
= hammer_btree_lookup(cursor
);
1439 hammer_cache_node(&ip
->cache
[0], cursor
->node
);
1440 if (ip
->sync_flags
& HAMMER_INODE_MTIME
) {
1442 * Updating MTIME requires an UNDO. Just cover
1443 * both atime and mtime.
1445 hammer_sync_lock_sh(trans
);
1446 hammer_modify_buffer(trans
, cursor
->data_buffer
,
1447 &cursor
->data
->inode
.mtime
,
1448 sizeof(cursor
->data
->inode
.atime
) +
1449 sizeof(cursor
->data
->inode
.mtime
));
1450 cursor
->data
->inode
.atime
= ip
->sync_ino_data
.atime
;
1451 cursor
->data
->inode
.mtime
= ip
->sync_ino_data
.mtime
;
1452 hammer_modify_buffer_done(cursor
->data_buffer
);
1453 hammer_sync_unlock(trans
);
1454 } else if (ip
->sync_flags
& HAMMER_INODE_ATIME
) {
1456 * Updating atime only can be done in-place with
1459 hammer_sync_lock_sh(trans
);
1460 hammer_modify_buffer_noundo(trans
, cursor
->data_buffer
);
1461 cursor
->data
->inode
.atime
= ip
->sync_ino_data
.atime
;
1462 hammer_modify_buffer_done(cursor
->data_buffer
);
1463 hammer_sync_unlock(trans
);
1465 ip
->sync_flags
&= ~(HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
);
1467 if (error
== EDEADLK
) {
1468 hammer_done_cursor(cursor
);
1469 error
= hammer_init_cursor(trans
, cursor
, &ip
->cache
[0], ip
);
1477 * Release a reference on an inode, flush as requested.
1479 * On the last reference we queue the inode to the flusher for its final
1483 hammer_rel_inode(hammer_inode_t ip
, int flush
)
1486 * Handle disposition when dropping the last ref.
1489 if (hammer_oneref(&ip
->lock
)) {
1491 * Determine whether on-disk action is needed for
1492 * the inode's final disposition.
1494 KKASSERT(ip
->vp
== NULL
);
1495 hammer_inode_unloadable_check(ip
, 0);
1496 if (ip
->flags
& HAMMER_INODE_MODMASK
) {
1497 hammer_flush_inode(ip
, 0);
1498 } else if (hammer_oneref(&ip
->lock
)) {
1499 hammer_unload_inode(ip
);
1504 hammer_flush_inode(ip
, 0);
1507 * The inode still has multiple refs, try to drop
1510 KKASSERT(hammer_isactive(&ip
->lock
) >= 1);
1511 if (hammer_isactive(&ip
->lock
) > 1) {
1512 hammer_rel(&ip
->lock
);
1520 * Unload and destroy the specified inode. Must be called with one remaining
1521 * reference. The reference is disposed of.
1523 * The inode must be completely clean.
1526 hammer_unload_inode(hammer_inode_t ip
)
1528 hammer_mount_t hmp
= ip
->hmp
;
1530 KASSERT(hammer_oneref(&ip
->lock
),
1531 ("hammer_unload_inode: %d refs", hammer_isactive(&ip
->lock
)));
1532 KKASSERT(ip
->vp
== NULL
);
1533 KKASSERT(ip
->flush_state
== HAMMER_FST_IDLE
);
1534 KKASSERT(ip
->cursor_ip_refs
== 0);
1535 KKASSERT(hammer_notlocked(&ip
->lock
));
1536 KKASSERT((ip
->flags
& HAMMER_INODE_MODMASK
) == 0);
1538 KKASSERT(RB_EMPTY(&ip
->rec_tree
));
1539 KKASSERT(TAILQ_EMPTY(&ip
->target_list
));
1541 if (ip
->flags
& HAMMER_INODE_RDIRTY
) {
1542 RB_REMOVE(hammer_redo_rb_tree
, &hmp
->rb_redo_root
, ip
);
1543 ip
->flags
&= ~HAMMER_INODE_RDIRTY
;
1545 RB_REMOVE(hammer_ino_rb_tree
, &hmp
->rb_inos_root
, ip
);
1547 hammer_free_inode(ip
);
1552 * Called during unmounting if a critical error occured. The in-memory
1553 * inode and all related structures are destroyed.
1555 * If a critical error did not occur the unmount code calls the standard
1556 * release and asserts that the inode is gone.
1559 hammer_destroy_inode_callback(hammer_inode_t ip
, void *data __unused
)
1561 hammer_record_t rec
;
1564 * Get rid of the inodes in-memory records, regardless of their
1565 * state, and clear the mod-mask.
1567 while ((rec
= TAILQ_FIRST(&ip
->target_list
)) != NULL
) {
1568 TAILQ_REMOVE(&ip
->target_list
, rec
, target_entry
);
1569 rec
->target_ip
= NULL
;
1570 if (rec
->flush_state
== HAMMER_FST_SETUP
)
1571 rec
->flush_state
= HAMMER_FST_IDLE
;
1573 while ((rec
= RB_ROOT(&ip
->rec_tree
)) != NULL
) {
1574 if (rec
->flush_state
== HAMMER_FST_FLUSH
)
1575 --rec
->flush_group
->refs
;
1577 hammer_ref(&rec
->lock
);
1578 KKASSERT(hammer_oneref(&rec
->lock
));
1579 rec
->flush_state
= HAMMER_FST_IDLE
;
1580 rec
->flush_group
= NULL
;
1581 rec
->flags
|= HAMMER_RECF_DELETED_FE
; /* wave hands */
1582 rec
->flags
|= HAMMER_RECF_DELETED_BE
; /* wave hands */
1583 ++ip
->rec_generation
;
1584 hammer_rel_mem_record(rec
);
1586 ip
->flags
&= ~HAMMER_INODE_MODMASK
;
1587 ip
->sync_flags
&= ~HAMMER_INODE_MODMASK
;
1588 KKASSERT(ip
->vp
== NULL
);
1591 * Remove the inode from any flush group, force it idle. FLUSH
1592 * and SETUP states have an inode ref.
1594 switch(ip
->flush_state
) {
1595 case HAMMER_FST_FLUSH
:
1596 RB_REMOVE(hammer_fls_rb_tree
, &ip
->flush_group
->flush_tree
, ip
);
1597 --ip
->flush_group
->refs
;
1598 ip
->flush_group
= NULL
;
1600 case HAMMER_FST_SETUP
:
1601 hammer_rel(&ip
->lock
);
1602 ip
->flush_state
= HAMMER_FST_IDLE
;
1604 case HAMMER_FST_IDLE
:
1609 * There shouldn't be any associated vnode. The unload needs at
1610 * least one ref, if we do have a vp steal its ip ref.
1613 hdkprintf("Unexpected vnode association ip %p vp %p\n",
1615 ip
->vp
->v_data
= NULL
;
1618 hammer_ref(&ip
->lock
);
1620 hammer_unload_inode(ip
);
1625 * Called on mount -u when switching from RW to RO or vise-versa. Adjust
1626 * the read-only flag for cached inodes.
1628 * This routine is called from a RB_SCAN().
1631 hammer_reload_inode(hammer_inode_t ip
, void *arg __unused
)
1633 hammer_mount_t hmp
= ip
->hmp
;
1635 if (hmp
->ronly
|| hmp
->asof
!= HAMMER_MAX_TID
)
1636 ip
->flags
|= HAMMER_INODE_RO
;
1638 ip
->flags
&= ~HAMMER_INODE_RO
;
1643 * A transaction has modified an inode, requiring updates as specified by
1646 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime,
1647 * and not including size changes due to write-append
1648 * (but other size changes are included).
1649 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to
1651 * HAMMER_INODE_XDIRTY: Dirty in-memory records
1652 * HAMMER_INODE_BUFS: Dirty buffer cache buffers
1653 * HAMMER_INODE_DELETED: Inode record/data must be deleted
1654 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated
1657 hammer_modify_inode(hammer_transaction_t trans
, hammer_inode_t ip
, int flags
)
1660 * ronly of 0 or 2 does not trigger assertion.
1661 * 2 is a special error state
1663 KKASSERT(ip
->hmp
->ronly
!= 1 ||
1664 (flags
& (HAMMER_INODE_DDIRTY
| HAMMER_INODE_XDIRTY
|
1665 HAMMER_INODE_SDIRTY
|
1666 HAMMER_INODE_BUFS
| HAMMER_INODE_DELETED
|
1667 HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
)) == 0);
1668 if ((ip
->flags
& HAMMER_INODE_RSV_INODES
) == 0) {
1669 ip
->flags
|= HAMMER_INODE_RSV_INODES
;
1670 ++ip
->hmp
->rsv_inodes
;
1674 * Set the NEWINODE flag in the transaction if the inode
1675 * transitions to a dirty state. This is used to track
1676 * the load on the inode cache.
1679 (ip
->flags
& HAMMER_INODE_MODMASK
) == 0 &&
1680 (flags
& HAMMER_INODE_MODMASK
)) {
1681 trans
->flags
|= HAMMER_TRANSF_NEWINODE
;
1683 if (flags
& HAMMER_INODE_MODMASK
)
1684 hammer_inode_dirty(ip
);
1689 * Attempt to quickly update the atime for a hammer inode. Return 0 on
1690 * success, -1 on failure.
1692 * We attempt to update the atime with only the ip lock and not the
1693 * whole filesystem lock in order to improve concurrency. We can only
1694 * do this safely if the ATIME flag is already pending on the inode.
1696 * This function is called via a vnops path (ip pointer is stable) without
1700 hammer_update_atime_quick(hammer_inode_t ip
)
1705 if ((ip
->flags
& HAMMER_INODE_RO
) ||
1706 (ip
->hmp
->mp
->mnt_flag
& MNT_NOATIME
)) {
1708 * Silently indicate success on read-only mount/snap
1711 } else if (ip
->flags
& HAMMER_INODE_ATIME
) {
1713 * Double check with inode lock held against backend. This
1714 * is only safe if all we need to do is update
1718 hammer_lock_ex(&ip
->lock
);
1719 if (ip
->flags
& HAMMER_INODE_ATIME
) {
1720 ip
->ino_data
.atime
=
1721 (unsigned long)ts
.tv_sec
* 1000000ULL +
1725 hammer_unlock(&ip
->lock
);
1731 * Request that an inode be flushed. This whole mess cannot block and may
1732 * recurse (if not synchronous). Once requested HAMMER will attempt to
1733 * actively flush the inode until the flush can be done.
1735 * The inode may already be flushing, or may be in a setup state. We can
1736 * place the inode in a flushing state if it is currently idle and flag it
1737 * to reflush if it is currently flushing.
1739 * Upon return if the inode could not be flushed due to a setup
1740 * dependancy, then it will be automatically flushed when the dependancy
1744 hammer_flush_inode(hammer_inode_t ip
, int flags
)
1747 hammer_flush_group_t flg
;
1751 * fill_flush_group is the first flush group we may be able to
1752 * continue filling, it may be open or closed but it will always
1753 * be past the currently flushing (running) flg.
1755 * next_flush_group is the next open flush group.
1758 while ((flg
= hmp
->fill_flush_group
) != NULL
) {
1759 KKASSERT(flg
->running
== 0);
1760 if (flg
->total_count
+ flg
->refs
<= ip
->hmp
->undo_rec_limit
&&
1761 flg
->total_count
<= hammer_autoflush
) {
1764 hmp
->fill_flush_group
= TAILQ_NEXT(flg
, flush_entry
);
1765 hammer_flusher_async(ip
->hmp
, flg
);
1768 flg
= kmalloc(sizeof(*flg
), hmp
->m_misc
, M_WAITOK
|M_ZERO
);
1769 flg
->seq
= hmp
->flusher
.next
++;
1770 if (hmp
->next_flush_group
== NULL
)
1771 hmp
->next_flush_group
= flg
;
1772 if (hmp
->fill_flush_group
== NULL
)
1773 hmp
->fill_flush_group
= flg
;
1774 RB_INIT(&flg
->flush_tree
);
1775 TAILQ_INSERT_TAIL(&hmp
->flush_group_list
, flg
, flush_entry
);
1779 * Trivial 'nothing to flush' case. If the inode is in a SETUP
1780 * state we have to put it back into an IDLE state so we can
1781 * drop the extra ref.
1783 * If we have a parent dependancy we must still fall through
1786 if ((ip
->flags
& HAMMER_INODE_MODMASK
) == 0) {
1787 if (ip
->flush_state
== HAMMER_FST_SETUP
&&
1788 TAILQ_EMPTY(&ip
->target_list
)) {
1789 ip
->flush_state
= HAMMER_FST_IDLE
;
1790 hammer_rel_inode(ip
, 0);
1792 if (ip
->flush_state
== HAMMER_FST_IDLE
)
1797 * Our flush action will depend on the current state.
1799 switch(ip
->flush_state
) {
1800 case HAMMER_FST_IDLE
:
1802 * We have no dependancies and can flush immediately. Some
1803 * our children may not be flushable so we have to re-test
1804 * with that additional knowledge.
1806 hammer_flush_inode_core(ip
, flg
, flags
);
1808 case HAMMER_FST_SETUP
:
1810 * Recurse upwards through dependancies via target_list
1811 * and start their flusher actions going if possible.
1813 * 'good' is our connectivity. -1 means we have none and
1814 * can't flush, 0 means there weren't any dependancies, and
1815 * 1 means we have good connectivity.
1817 good
= hammer_setup_parent_inodes(ip
, 0, flg
);
1821 * We can continue if good >= 0. Determine how
1822 * many records under our inode can be flushed (and
1825 hammer_flush_inode_core(ip
, flg
, flags
);
1828 * Parent has no connectivity, tell it to flush
1829 * us as soon as it does.
1831 * The REFLUSH flag is also needed to trigger
1832 * dependancy wakeups.
1834 ip
->flags
|= HAMMER_INODE_CONN_DOWN
|
1835 HAMMER_INODE_REFLUSH
;
1836 if (flags
& HAMMER_FLUSH_SIGNAL
) {
1837 ip
->flags
|= HAMMER_INODE_RESIGNAL
;
1838 hammer_flusher_async(ip
->hmp
, flg
);
1842 case HAMMER_FST_FLUSH
:
1844 * We are already flushing, flag the inode to reflush
1845 * if needed after it completes its current flush.
1847 * The REFLUSH flag is also needed to trigger
1848 * dependancy wakeups.
1850 if ((ip
->flags
& HAMMER_INODE_REFLUSH
) == 0)
1851 ip
->flags
|= HAMMER_INODE_REFLUSH
;
1852 if (flags
& HAMMER_FLUSH_SIGNAL
) {
1853 ip
->flags
|= HAMMER_INODE_RESIGNAL
;
1854 hammer_flusher_async(ip
->hmp
, flg
);
1861 * Scan ip->target_list, which is a list of records owned by PARENTS to our
1862 * ip which reference our ip.
1864 * XXX This is a huge mess of recursive code, but not one bit of it blocks
1865 * so for now do not ref/deref the structures. Note that if we use the
1866 * ref/rel code later, the rel CAN block.
1869 hammer_setup_parent_inodes(hammer_inode_t ip
, int depth
,
1870 hammer_flush_group_t flg
)
1872 hammer_record_t depend
;
1877 * If we hit our recursion limit and we have parent dependencies
1878 * We cannot continue. Returning < 0 will cause us to be flagged
1879 * for reflush. Returning -2 cuts off additional dependency checks
1880 * because they are likely to also hit the depth limit.
1882 * We cannot return < 0 if there are no dependencies or there might
1883 * not be anything to wakeup (ip).
1885 if (depth
== 20 && TAILQ_FIRST(&ip
->target_list
)) {
1886 if (hammer_debug_general
& 0x10000)
1887 hkrateprintf(&hammer_gen_krate
,
1888 "Warning: depth limit reached on "
1889 "setup recursion, inode %p %016jx\n",
1890 ip
, (intmax_t)ip
->obj_id
);
1898 TAILQ_FOREACH(depend
, &ip
->target_list
, target_entry
) {
1899 r
= hammer_setup_parent_inodes_helper(depend
, depth
, flg
);
1900 KKASSERT(depend
->target_ip
== ip
);
1901 if (r
< 0 && good
== 0)
1907 * If we failed due to the recursion depth limit then stop
1917 * This helper function takes a record representing the dependancy between
1918 * the parent inode and child inode.
1920 * record = record in question (*rec in below)
1921 * record->ip = parent inode (*pip in below)
1922 * record->target_ip = child inode (*ip in below)
1924 * *pip--------------\
1927 * \ip /\\\\\ rbtree of recs from parent inode's view
1931 * \------*rec------target_ip------>*ip
1932 * ...target_entry<----...----->target_list<---...
1933 * list of recs from inode's view
1935 * We are asked to recurse upwards and convert the record from SETUP
1936 * to FLUSH if possible.
1938 * Return 1 if the record gives us connectivity
1940 * Return 0 if the record is not relevant
1942 * Return -1 if we can't resolve the dependancy and there is no connectivity.
1945 hammer_setup_parent_inodes_helper(hammer_record_t record
, int depth
,
1946 hammer_flush_group_t flg
)
1951 KKASSERT(record
->flush_state
!= HAMMER_FST_IDLE
);
1955 * If the record is already flushing, is it in our flush group?
1957 * If it is in our flush group but it is a general record or a
1958 * delete-on-disk, it does not improve our connectivity (return 0),
1959 * and if the target inode is not trying to destroy itself we can't
1960 * allow the operation yet anyway (the second return -1).
1962 if (record
->flush_state
== HAMMER_FST_FLUSH
) {
1964 * If not in our flush group ask the parent to reflush
1965 * us as soon as possible.
1967 if (record
->flush_group
!= flg
) {
1968 pip
->flags
|= HAMMER_INODE_REFLUSH
;
1969 record
->target_ip
->flags
|= HAMMER_INODE_CONN_DOWN
;
1974 * If in our flush group everything is already set up,
1975 * just return whether the record will improve our
1976 * visibility or not.
1978 if (record
->type
== HAMMER_MEM_RECORD_ADD
)
1984 * It must be a setup record. Try to resolve the setup dependancies
1985 * by recursing upwards so we can place ip on the flush list.
1987 * Limit ourselves to 20 levels of recursion to avoid blowing out
1988 * the kernel stack. If we hit the recursion limit we can't flush
1989 * until the parent flushes. The parent will flush independantly
1990 * on its own and ultimately a deep recursion will be resolved.
1992 KKASSERT(record
->flush_state
== HAMMER_FST_SETUP
);
1994 good
= hammer_setup_parent_inodes(pip
, depth
+ 1, flg
);
1997 * If good < 0 the parent has no connectivity and we cannot safely
1998 * flush the directory entry, which also means we can't flush our
1999 * ip. Flag us for downward recursion once the parent's
2000 * connectivity is resolved. Flag the parent for [re]flush or it
2001 * may not check for downward recursions.
2004 pip
->flags
|= HAMMER_INODE_REFLUSH
;
2005 record
->target_ip
->flags
|= HAMMER_INODE_CONN_DOWN
;
2010 * We are go, place the parent inode in a flushing state so we can
2011 * place its record in a flushing state. Note that the parent
2012 * may already be flushing. The record must be in the same flush
2013 * group as the parent.
2015 if (pip
->flush_state
!= HAMMER_FST_FLUSH
)
2016 hammer_flush_inode_core(pip
, flg
, HAMMER_FLUSH_RECURSION
);
2017 KKASSERT(pip
->flush_state
== HAMMER_FST_FLUSH
);
2020 * It is possible for a rename to create a loop in the recursion
2021 * and revisit a record. This will result in the record being
2022 * placed in a flush state unexpectedly. This check deals with
2025 if (record
->flush_state
== HAMMER_FST_FLUSH
) {
2026 if (record
->type
== HAMMER_MEM_RECORD_ADD
)
2031 KKASSERT(record
->flush_state
== HAMMER_FST_SETUP
);
2034 if (record
->type
== HAMMER_MEM_RECORD_DEL
&&
2035 (record
->target_ip
->flags
& (HAMMER_INODE_DELETED
|HAMMER_INODE_DELONDISK
)) == 0) {
2037 * Regardless of flushing state we cannot sync this path if the
2038 * record represents a delete-on-disk but the target inode
2039 * is not ready to sync its own deletion.
2041 * XXX need to count effective nlinks to determine whether
2042 * the flush is ok, otherwise removing a hardlink will
2043 * just leave the DEL record to rot.
2045 record
->target_ip
->flags
|= HAMMER_INODE_REFLUSH
;
2049 if (pip
->flush_group
== flg
) {
2051 * Because we have not calculated nlinks yet we can just
2052 * set records to the flush state if the parent is in
2053 * the same flush group as we are.
2055 record
->flush_state
= HAMMER_FST_FLUSH
;
2056 record
->flush_group
= flg
;
2057 ++record
->flush_group
->refs
;
2058 hammer_ref(&record
->lock
);
2061 * A general directory-add contributes to our visibility.
2063 * Otherwise it is probably a directory-delete or
2064 * delete-on-disk record and does not contribute to our
2065 * visibility (but we can still flush it).
2067 if (record
->type
== HAMMER_MEM_RECORD_ADD
)
2072 * If the parent is not in our flush group we cannot
2073 * flush this record yet, there is no visibility.
2074 * We tell the parent to reflush and mark ourselves
2075 * so the parent knows it should flush us too.
2077 pip
->flags
|= HAMMER_INODE_REFLUSH
;
2078 record
->target_ip
->flags
|= HAMMER_INODE_CONN_DOWN
;
2084 * This is the core routine placing an inode into the FST_FLUSH state.
2087 hammer_flush_inode_core(hammer_inode_t ip
, hammer_flush_group_t flg
, int flags
)
2089 hammer_mount_t hmp
= ip
->hmp
;
2093 * Set flush state and prevent the flusher from cycling into
2094 * the next flush group. Do not place the ip on the list yet.
2095 * Inodes not in the idle state get an extra reference.
2097 KKASSERT(ip
->flush_state
!= HAMMER_FST_FLUSH
);
2098 if (ip
->flush_state
== HAMMER_FST_IDLE
)
2099 hammer_ref(&ip
->lock
);
2100 ip
->flush_state
= HAMMER_FST_FLUSH
;
2101 ip
->flush_group
= flg
;
2102 ++hmp
->flusher
.group_lock
;
2103 ++hmp
->count_iqueued
;
2104 ++hammer_count_iqueued
;
2106 hammer_redo_fifo_start_flush(ip
);
2110 * We need to be able to vfsync/truncate from the backend.
2112 * XXX Any truncation from the backend will acquire the vnode
2115 KKASSERT((ip
->flags
& HAMMER_INODE_VHELD
) == 0);
2116 if (ip
->vp
&& (ip
->vp
->v_flag
& VINACTIVE
) == 0) {
2117 ip
->flags
|= HAMMER_INODE_VHELD
;
2123 * Figure out how many in-memory records we can actually flush
2124 * (not including inode meta-data, buffers, etc).
2126 KKASSERT((ip
->flags
& HAMMER_INODE_WOULDBLOCK
) == 0);
2127 if (flags
& HAMMER_FLUSH_RECURSION
) {
2129 * If this is a upwards recursion we do not want to
2130 * recurse down again!
2134 } else if (ip
->flags
& HAMMER_INODE_WOULDBLOCK
) {
2136 * No new records are added if we must complete a flush
2137 * from a previous cycle, but we do have to move the records
2138 * from the previous cycle to the current one.
2141 go_count
= RB_SCAN(hammer_rec_rb_tree
, &ip
->rec_tree
, NULL
,
2142 hammer_syncgrp_child_callback
, NULL
);
2148 * Normal flush, scan records and bring them into the flush.
2149 * Directory adds and deletes are usually skipped (they are
2150 * grouped with the related inode rather then with the
2153 * go_count can be negative, which means the scan aborted
2154 * due to the flush group being over-full and we should
2155 * flush what we have.
2157 go_count
= RB_SCAN(hammer_rec_rb_tree
, &ip
->rec_tree
, NULL
,
2158 hammer_setup_child_callback
, NULL
);
2162 * This is a more involved test that includes go_count. If we
2163 * can't flush, flag the inode and return. If go_count is 0 we
2164 * were are unable to flush any records in our rec_tree and
2165 * must ignore the XDIRTY flag.
2167 if (go_count
== 0) {
2168 if ((ip
->flags
& HAMMER_INODE_MODMASK_NOXDIRTY
) == 0) {
2169 --hmp
->count_iqueued
;
2170 --hammer_count_iqueued
;
2173 ip
->flush_state
= HAMMER_FST_SETUP
;
2174 ip
->flush_group
= NULL
;
2175 if (flags
& HAMMER_FLUSH_SIGNAL
) {
2176 ip
->flags
|= HAMMER_INODE_REFLUSH
|
2177 HAMMER_INODE_RESIGNAL
;
2179 ip
->flags
|= HAMMER_INODE_REFLUSH
;
2182 if (ip
->flags
& HAMMER_INODE_VHELD
) {
2183 ip
->flags
&= ~HAMMER_INODE_VHELD
;
2189 * REFLUSH is needed to trigger dependancy wakeups
2190 * when an inode is in SETUP.
2192 ip
->flags
|= HAMMER_INODE_REFLUSH
;
2193 if (--hmp
->flusher
.group_lock
== 0)
2194 wakeup(&hmp
->flusher
.group_lock
);
2200 * Snapshot the state of the inode for the backend flusher.
2202 * We continue to retain save_trunc_off even when all truncations
2203 * have been resolved as an optimization to determine if we can
2204 * skip the B-Tree lookup for overwrite deletions.
2206 * NOTE: The DELETING flag is a mod flag, but it is also sticky,
2207 * and stays in ip->flags. Once set, it stays set until the
2208 * inode is destroyed.
2210 if (ip
->flags
& HAMMER_INODE_TRUNCATED
) {
2211 KKASSERT((ip
->sync_flags
& HAMMER_INODE_TRUNCATED
) == 0);
2212 ip
->sync_trunc_off
= ip
->trunc_off
;
2213 ip
->trunc_off
= HAMMER_MAX_KEY
;
2214 ip
->flags
&= ~HAMMER_INODE_TRUNCATED
;
2215 ip
->sync_flags
|= HAMMER_INODE_TRUNCATED
;
2218 * The save_trunc_off used to cache whether the B-Tree
2219 * holds any records past that point is not used until
2220 * after the truncation has succeeded, so we can safely
2223 if (ip
->save_trunc_off
> ip
->sync_trunc_off
)
2224 ip
->save_trunc_off
= ip
->sync_trunc_off
;
2226 ip
->sync_flags
|= (ip
->flags
& HAMMER_INODE_MODMASK
&
2227 ~HAMMER_INODE_TRUNCATED
);
2228 ip
->sync_ino_leaf
= ip
->ino_leaf
;
2229 ip
->sync_ino_data
= ip
->ino_data
;
2230 ip
->flags
&= ~HAMMER_INODE_MODMASK
| HAMMER_INODE_TRUNCATED
;
2233 * The flusher list inherits our inode and reference.
2235 KKASSERT(flg
->running
== 0);
2236 RB_INSERT(hammer_fls_rb_tree
, &flg
->flush_tree
, ip
);
2237 if (--hmp
->flusher
.group_lock
== 0)
2238 wakeup(&hmp
->flusher
.group_lock
);
2241 * Auto-flush the group if it grows too large. Make sure the
2242 * inode reclaim wait pipeline continues to work.
2244 if (flg
->total_count
>= hammer_autoflush
||
2245 flg
->total_count
>= hammer_limit_reclaims
/ 4) {
2246 if (hmp
->fill_flush_group
== flg
)
2247 hmp
->fill_flush_group
= TAILQ_NEXT(flg
, flush_entry
);
2248 hammer_flusher_async(hmp
, flg
);
2253 * Callback for scan of ip->rec_tree. Try to include each record in our
2254 * flush. ip->flush_group has been set but the inode has not yet been
2255 * moved into a flushing state.
2257 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on
2260 * We return 1 for any record placed or found in FST_FLUSH, which prevents
2261 * the caller from shortcutting the flush.
2264 hammer_setup_child_callback(hammer_record_t rec
, void *data
)
2266 hammer_flush_group_t flg
;
2267 hammer_inode_t target_ip
;
2272 * Records deleted or committed by the backend are ignored.
2273 * Note that the flush detects deleted frontend records at
2274 * multiple points to deal with races. This is just the first
2275 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot
2276 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it
2277 * messes up link-count calculations.
2279 * NOTE: Don't get confused between record deletion and, say,
2280 * directory entry deletion. The deletion of a directory entry
2281 * which is on-media has nothing to do with the record deletion
2284 if (rec
->flags
& (HAMMER_RECF_DELETED_FE
| HAMMER_RECF_DELETED_BE
|
2285 HAMMER_RECF_COMMITTED
)) {
2286 if (rec
->flush_state
== HAMMER_FST_FLUSH
) {
2287 KKASSERT(rec
->flush_group
== rec
->ip
->flush_group
);
2296 * If the record is in an idle state it has no dependancies and
2300 flg
= ip
->flush_group
;
2303 switch(rec
->flush_state
) {
2304 case HAMMER_FST_IDLE
:
2306 * The record has no setup dependancy, we can flush it.
2308 KKASSERT(rec
->target_ip
== NULL
);
2309 rec
->flush_state
= HAMMER_FST_FLUSH
;
2310 rec
->flush_group
= flg
;
2312 hammer_ref(&rec
->lock
);
2315 case HAMMER_FST_SETUP
:
2317 * The record has a setup dependancy. These are typically
2318 * directory entry adds and deletes. Such entries will be
2319 * flushed when their inodes are flushed so we do not
2320 * usually have to add them to the flush here. However,
2321 * if the target_ip has set HAMMER_INODE_CONN_DOWN then
2322 * it is asking us to flush this record (and it).
2324 target_ip
= rec
->target_ip
;
2325 KKASSERT(target_ip
!= NULL
);
2326 KKASSERT(target_ip
->flush_state
!= HAMMER_FST_IDLE
);
2329 * If the target IP is already flushing in our group
2330 * we could associate the record, but target_ip has
2331 * already synced ino_data to sync_ino_data and we
2332 * would also have to adjust nlinks. Plus there are
2333 * ordering issues for adds and deletes.
2335 * Reflush downward if this is an ADD, and upward if
2338 if (target_ip
->flush_state
== HAMMER_FST_FLUSH
) {
2339 if (rec
->type
== HAMMER_MEM_RECORD_ADD
)
2340 ip
->flags
|= HAMMER_INODE_REFLUSH
;
2342 target_ip
->flags
|= HAMMER_INODE_REFLUSH
;
2347 * Target IP is not yet flushing. This can get complex
2348 * because we have to be careful about the recursion.
2350 * Directories create an issue for us in that if a flush
2351 * of a directory is requested the expectation is to flush
2352 * any pending directory entries, but this will cause the
2353 * related inodes to recursively flush as well. We can't
2354 * really defer the operation so just get as many as we
2358 if ((target_ip
->flags
& HAMMER_INODE_RECLAIM
) == 0 &&
2359 (target_ip
->flags
& HAMMER_INODE_CONN_DOWN
) == 0) {
2361 * We aren't reclaiming and the target ip was not
2362 * previously prevented from flushing due to this
2363 * record dependancy. Do not flush this record.
2368 if (flg
->total_count
+ flg
->refs
>
2369 ip
->hmp
->undo_rec_limit
) {
2371 * Our flush group is over-full and we risk blowing
2372 * out the UNDO FIFO. Stop the scan, flush what we
2373 * have, then reflush the directory.
2375 * The directory may be forced through multiple
2376 * flush groups before it can be completely
2379 ip
->flags
|= HAMMER_INODE_RESIGNAL
|
2380 HAMMER_INODE_REFLUSH
;
2382 } else if (rec
->type
== HAMMER_MEM_RECORD_ADD
) {
2384 * If the target IP is not flushing we can force
2385 * it to flush, even if it is unable to write out
2386 * any of its own records we have at least one in
2387 * hand that we CAN deal with.
2389 rec
->flush_state
= HAMMER_FST_FLUSH
;
2390 rec
->flush_group
= flg
;
2392 hammer_ref(&rec
->lock
);
2393 hammer_flush_inode_core(target_ip
, flg
,
2394 HAMMER_FLUSH_RECURSION
);
2398 * General or delete-on-disk record.
2400 * XXX this needs help. If a delete-on-disk we could
2401 * disconnect the target. If the target has its own
2402 * dependancies they really need to be flushed.
2406 rec
->flush_state
= HAMMER_FST_FLUSH
;
2407 rec
->flush_group
= flg
;
2409 hammer_ref(&rec
->lock
);
2410 hammer_flush_inode_core(target_ip
, flg
,
2411 HAMMER_FLUSH_RECURSION
);
2415 case HAMMER_FST_FLUSH
:
2417 * The record could be part of a previous flush group if the
2418 * inode is a directory (the record being a directory entry).
2419 * Once the flush group was closed a hammer_test_inode()
2420 * function can cause a new flush group to be setup, placing
2421 * the directory inode itself in a new flush group.
2423 * When associated with a previous flush group we count it
2424 * as if it were in our current flush group, since it will
2425 * effectively be flushed by the time we flush our current
2429 rec
->ip
->ino_data
.obj_type
== HAMMER_OBJTYPE_DIRECTORY
||
2430 rec
->flush_group
== flg
);
2439 * This version just moves records already in a flush state to the new
2440 * flush group and that is it.
2443 hammer_syncgrp_child_callback(hammer_record_t rec
, void *data
)
2445 hammer_inode_t ip
= rec
->ip
;
2447 switch(rec
->flush_state
) {
2448 case HAMMER_FST_FLUSH
:
2449 KKASSERT(rec
->flush_group
== ip
->flush_group
);
2459 * Wait for a previously queued flush to complete.
2461 * If a critical error occured we don't try to wait.
2464 hammer_wait_inode(hammer_inode_t ip
)
2467 * The inode can be in a SETUP state in which case RESIGNAL
2468 * should be set. If RESIGNAL is not set then the previous
2469 * flush completed and a later operation placed the inode
2470 * in a passive setup state again, so we're done.
2472 * The inode can be in a FLUSH state in which case we
2473 * can just wait for completion.
2475 while (ip
->flush_state
== HAMMER_FST_FLUSH
||
2476 (ip
->flush_state
== HAMMER_FST_SETUP
&&
2477 (ip
->flags
& HAMMER_INODE_RESIGNAL
))) {
2479 * Don't try to flush on a critical error
2481 if (ip
->hmp
->flags
& HAMMER_MOUNT_CRITICAL_ERROR
)
2485 * If the inode was already being flushed its flg
2486 * may not have been queued to the backend. We
2487 * have to make sure it gets queued or we can wind
2488 * up blocked or deadlocked (particularly if we are
2489 * the vnlru thread).
2491 if (ip
->flush_state
== HAMMER_FST_FLUSH
) {
2492 KKASSERT(ip
->flush_group
);
2493 if (ip
->flush_group
->closed
== 0) {
2494 if (hammer_debug_inode
) {
2495 hkprintf("debug: forcing "
2496 "async flush ip %016jx\n",
2497 (intmax_t)ip
->obj_id
);
2499 hammer_flusher_async(ip
->hmp
, ip
->flush_group
);
2500 continue; /* retest */
2505 * In a flush state with the flg queued to the backend
2506 * or in a setup state with RESIGNAL set, we can safely
2509 ip
->flags
|= HAMMER_INODE_FLUSHW
;
2510 tsleep(&ip
->flags
, 0, "hmrwin", 0);
2515 * The inode may have been in a passive setup state,
2516 * call flush to make sure we get signaled.
2518 if (ip
->flush_state
== HAMMER_FST_SETUP
)
2519 hammer_flush_inode(ip
, HAMMER_FLUSH_SIGNAL
);
2525 * Called by the backend code when a flush has been completed.
2526 * The inode has already been removed from the flush list.
2528 * A pipelined flush can occur, in which case we must re-enter the
2529 * inode on the list and re-copy its fields.
2532 hammer_sync_inode_done(hammer_inode_t ip
, int error
)
2537 KKASSERT(ip
->flush_state
== HAMMER_FST_FLUSH
);
2542 * Auto-reflush if the backend could not completely flush
2543 * the inode. This fixes a case where a deferred buffer flush
2544 * could cause fsync to return early.
2546 if (ip
->sync_flags
& HAMMER_INODE_MODMASK
)
2547 ip
->flags
|= HAMMER_INODE_REFLUSH
;
2550 * Merge left-over flags back into the frontend and fix the state.
2551 * Incomplete truncations are retained by the backend.
2554 ip
->flags
|= ip
->sync_flags
& ~HAMMER_INODE_TRUNCATED
;
2555 ip
->sync_flags
&= HAMMER_INODE_TRUNCATED
;
2558 * The backend may have adjusted nlinks, so if the adjusted nlinks
2559 * does not match the fronttend set the frontend's DDIRTY flag again.
2561 if (ip
->ino_data
.nlinks
!= ip
->sync_ino_data
.nlinks
)
2562 ip
->flags
|= HAMMER_INODE_DDIRTY
;
2565 * Fix up the dirty buffer status.
2567 if (ip
->vp
&& RB_ROOT(&ip
->vp
->v_rbdirty_tree
)) {
2568 ip
->flags
|= HAMMER_INODE_BUFS
;
2570 hammer_redo_fifo_end_flush(ip
);
2573 * Re-set the XDIRTY flag if some of the inode's in-memory records
2574 * could not be flushed.
2576 KKASSERT((RB_EMPTY(&ip
->rec_tree
) &&
2577 (ip
->flags
& HAMMER_INODE_XDIRTY
) == 0) ||
2578 (!RB_EMPTY(&ip
->rec_tree
) &&
2579 (ip
->flags
& HAMMER_INODE_XDIRTY
) != 0));
2582 * Do not lose track of inodes which no longer have vnode
2583 * assocations, otherwise they may never get flushed again.
2585 * The reflush flag can be set superfluously, causing extra pain
2586 * for no reason. If the inode is no longer modified it no longer
2587 * needs to be flushed.
2589 if (ip
->flags
& HAMMER_INODE_MODMASK
) {
2591 ip
->flags
|= HAMMER_INODE_REFLUSH
;
2593 ip
->flags
&= ~HAMMER_INODE_REFLUSH
;
2597 * The fs token is held but the inode lock is not held. Because this
2598 * is a backend flush it is possible that the vnode has no references
2599 * and cause a reclaim race inside vsetisdirty() if/when it blocks.
2601 * Therefore, we must lock the inode around this particular dirtying
2602 * operation. We don't have to around other dirtying operations
2603 * where the vnode is implicitly or explicitly held.
2605 if (ip
->flags
& HAMMER_INODE_MODMASK
) {
2606 hammer_lock_ex(&ip
->lock
);
2607 hammer_inode_dirty(ip
);
2608 hammer_unlock(&ip
->lock
);
2612 * Adjust the flush state.
2614 if (ip
->flags
& HAMMER_INODE_WOULDBLOCK
) {
2616 * We were unable to flush out all our records, leave the
2617 * inode in a flush state and in the current flush group.
2618 * The flush group will be re-run.
2620 * This occurs if the UNDO block gets too full or there is
2621 * too much dirty meta-data and allows the flusher to
2622 * finalize the UNDO block and then re-flush.
2624 ip
->flags
&= ~HAMMER_INODE_WOULDBLOCK
;
2628 * Remove from the flush_group
2630 RB_REMOVE(hammer_fls_rb_tree
, &ip
->flush_group
->flush_tree
, ip
);
2631 ip
->flush_group
= NULL
;
2635 * Clean up the vnode ref and tracking counts.
2637 if (ip
->flags
& HAMMER_INODE_VHELD
) {
2638 ip
->flags
&= ~HAMMER_INODE_VHELD
;
2642 --hmp
->count_iqueued
;
2643 --hammer_count_iqueued
;
2646 * And adjust the state.
2648 if (TAILQ_EMPTY(&ip
->target_list
) && RB_EMPTY(&ip
->rec_tree
)) {
2649 ip
->flush_state
= HAMMER_FST_IDLE
;
2652 ip
->flush_state
= HAMMER_FST_SETUP
;
2657 * If the frontend is waiting for a flush to complete,
2660 if (ip
->flags
& HAMMER_INODE_FLUSHW
) {
2661 ip
->flags
&= ~HAMMER_INODE_FLUSHW
;
2666 * If the frontend made more changes and requested another
2667 * flush, then try to get it running.
2669 * Reflushes are aborted when the inode is errored out.
2671 if (ip
->flags
& HAMMER_INODE_REFLUSH
) {
2672 ip
->flags
&= ~HAMMER_INODE_REFLUSH
;
2673 if (ip
->flags
& HAMMER_INODE_RESIGNAL
) {
2674 ip
->flags
&= ~HAMMER_INODE_RESIGNAL
;
2675 hammer_flush_inode(ip
, HAMMER_FLUSH_SIGNAL
);
2677 hammer_flush_inode(ip
, 0);
2683 * If we have no parent dependancies we can clear CONN_DOWN
2685 if (TAILQ_EMPTY(&ip
->target_list
))
2686 ip
->flags
&= ~HAMMER_INODE_CONN_DOWN
;
2689 * If the inode is now clean drop the space reservation.
2691 if ((ip
->flags
& HAMMER_INODE_MODMASK
) == 0 &&
2692 (ip
->flags
& HAMMER_INODE_RSV_INODES
)) {
2693 ip
->flags
&= ~HAMMER_INODE_RSV_INODES
;
2697 ip
->flags
&= ~HAMMER_INODE_SLAVEFLUSH
;
2700 hammer_rel_inode(ip
, 0);
2704 * Called from hammer_sync_inode() to synchronize in-memory records
2708 hammer_sync_record_callback(hammer_record_t record
, void *data
)
2710 hammer_cursor_t cursor
= data
;
2711 hammer_transaction_t trans
= cursor
->trans
;
2712 hammer_mount_t hmp
= trans
->hmp
;
2716 * Skip records that do not belong to the current flush.
2718 ++hammer_stats_record_iterations
;
2719 if (record
->flush_state
!= HAMMER_FST_FLUSH
)
2722 if (record
->flush_group
!= record
->ip
->flush_group
) {
2723 hdkprintf("rec %p ip %p bad flush group %p %p\n",
2726 record
->flush_group
,
2727 record
->ip
->flush_group
);
2728 if (hammer_debug_critical
)
2732 KKASSERT(record
->flush_group
== record
->ip
->flush_group
);
2735 * Interlock the record using the BE flag. Once BE is set the
2736 * frontend cannot change the state of FE.
2738 * NOTE: If FE is set prior to us setting BE we still sync the
2739 * record out, but the flush completion code converts it to
2740 * a delete-on-disk record instead of destroying it.
2742 KKASSERT((record
->flags
& HAMMER_RECF_INTERLOCK_BE
) == 0);
2743 record
->flags
|= HAMMER_RECF_INTERLOCK_BE
;
2746 * The backend has already disposed of the record.
2748 if (record
->flags
& (HAMMER_RECF_DELETED_BE
| HAMMER_RECF_COMMITTED
)) {
2754 * If the whole inode is being deleted and all on-disk records will
2755 * be deleted very soon, we can't sync any new records to disk
2756 * because they will be deleted in the same transaction they were
2757 * created in (delete_tid == create_tid), which will assert.
2759 * XXX There may be a case with RECORD_ADD with DELETED_FE set
2760 * that we currently panic on.
2762 if (record
->ip
->sync_flags
& HAMMER_INODE_DELETING
) {
2763 switch(record
->type
) {
2764 case HAMMER_MEM_RECORD_DATA
:
2766 * We don't have to do anything, if the record was
2767 * committed the space will have been accounted for
2771 case HAMMER_MEM_RECORD_GENERAL
:
2773 * Set deleted-by-backend flag. Do not set the
2774 * backend committed flag, because we are throwing
2777 record
->flags
|= HAMMER_RECF_DELETED_BE
;
2778 ++record
->ip
->rec_generation
;
2781 case HAMMER_MEM_RECORD_ADD
:
2782 hpanic("illegal add during inode deletion record %p",
2784 break; /* NOT REACHED */
2785 case HAMMER_MEM_RECORD_INODE
:
2786 hpanic("attempt to sync inode record %p?", record
);
2787 break; /* NOT REACHED */
2788 case HAMMER_MEM_RECORD_DEL
:
2790 * Follow through and issue the on-disk deletion
2797 * If DELETED_FE is set special handling is needed for directory
2798 * entries. Dependant pieces related to the directory entry may
2799 * have already been synced to disk. If this occurs we have to
2800 * sync the directory entry and then change the in-memory record
2801 * from an ADD to a DELETE to cover the fact that it's been
2802 * deleted by the frontend.
2804 * A directory delete covering record (MEM_RECORD_DEL) can never
2805 * be deleted by the frontend.
2807 * Any other record type (aka DATA) can be deleted by the frontend.
2808 * XXX At the moment the flusher must skip it because there may
2809 * be another data record in the flush group for the same block,
2810 * meaning that some frontend data changes can leak into the backend's
2811 * synchronization point.
2813 if (record
->flags
& HAMMER_RECF_DELETED_FE
) {
2814 if (record
->type
== HAMMER_MEM_RECORD_ADD
) {
2816 * Convert a front-end deleted directory-add to
2817 * a directory-delete entry later.
2819 record
->flags
|= HAMMER_RECF_CONVERT_DELETE
;
2822 * Dispose of the record (race case). Mark as
2823 * deleted by backend (and not committed).
2825 KKASSERT(record
->type
!= HAMMER_MEM_RECORD_DEL
);
2826 record
->flags
|= HAMMER_RECF_DELETED_BE
;
2827 ++record
->ip
->rec_generation
;
2834 * Assign the create_tid for new records. Deletions already
2835 * have the record's entire key properly set up.
2837 if (record
->type
!= HAMMER_MEM_RECORD_DEL
) {
2838 record
->leaf
.base
.create_tid
= trans
->tid
;
2839 record
->leaf
.create_ts
= trans
->time32
;
2843 * This actually moves the record to the on-media B-Tree. We
2844 * must also generate REDO_TERM entries in the UNDO/REDO FIFO
2845 * indicating that the related REDO_WRITE(s) have been committed.
2847 * During recovery any REDO_TERM's within the nominal recovery span
2848 * are ignored since the related meta-data is being undone, causing
2849 * any matching REDO_WRITEs to execute. The REDO_TERMs outside
2850 * the nominal recovery span will match against REDO_WRITEs and
2851 * prevent them from being executed (because the meta-data has
2852 * already been synchronized).
2854 if (record
->flags
& HAMMER_RECF_REDO
) {
2855 KKASSERT(record
->type
== HAMMER_MEM_RECORD_DATA
);
2856 hammer_generate_redo(trans
, record
->ip
,
2857 record
->leaf
.base
.key
-
2858 record
->leaf
.data_len
,
2859 HAMMER_REDO_TERM_WRITE
,
2861 record
->leaf
.data_len
);
2865 error
= hammer_ip_sync_record_cursor(cursor
, record
);
2866 if (error
!= EDEADLK
)
2868 hammer_done_cursor(cursor
);
2869 error
= hammer_init_cursor(trans
, cursor
, &record
->ip
->cache
[0],
2874 record
->flags
&= ~HAMMER_RECF_CONVERT_DELETE
;
2879 hammer_flush_record_done(record
, error
);
2882 * Do partial finalization if we have built up too many dirty
2883 * buffers. Otherwise a buffer cache deadlock can occur when
2884 * doing things like creating tens of thousands of tiny files.
2886 * We must release our cursor lock to avoid a 3-way deadlock
2887 * due to the exclusive sync lock the finalizer must get.
2889 * WARNING: See warnings in hammer_unlock_cursor() function.
2891 if (hammer_flusher_meta_limit(hmp
) ||
2892 vm_paging_severe()) {
2893 hammer_unlock_cursor(cursor
);
2894 hammer_flusher_finalize(trans
, 0);
2895 hammer_lock_cursor(cursor
);
2901 * Backend function called by the flusher to sync an inode to media.
2904 hammer_sync_inode(hammer_transaction_t trans
, hammer_inode_t ip
)
2906 struct hammer_cursor cursor
;
2907 hammer_node_t tmp_node
;
2908 hammer_record_t depend
;
2909 hammer_record_t next
;
2910 int error
, tmp_error
;
2913 if ((ip
->sync_flags
& HAMMER_INODE_MODMASK
) == 0)
2916 error
= hammer_init_cursor(trans
, &cursor
, &ip
->cache
[1], ip
);
2921 * Any directory records referencing this inode which are not in
2922 * our current flush group must adjust our nlink count for the
2923 * purposes of synchronizating to disk.
2925 * Records which are in our flush group can be unlinked from our
2926 * inode now, potentially allowing the inode to be physically
2929 * This cannot block.
2931 nlinks
= ip
->ino_data
.nlinks
;
2932 next
= TAILQ_FIRST(&ip
->target_list
);
2933 while ((depend
= next
) != NULL
) {
2934 next
= TAILQ_NEXT(depend
, target_entry
);
2935 if (depend
->flush_state
== HAMMER_FST_FLUSH
&&
2936 depend
->flush_group
== ip
->flush_group
) {
2938 * If this is an ADD that was deleted by the frontend
2939 * the frontend nlinks count will have already been
2940 * decremented, but the backend is going to sync its
2941 * directory entry and must account for it. The
2942 * record will be converted to a delete-on-disk when
2945 * If the ADD was not deleted by the frontend we
2946 * can remove the dependancy from our target_list.
2948 if (depend
->flags
& HAMMER_RECF_DELETED_FE
) {
2951 TAILQ_REMOVE(&ip
->target_list
, depend
,
2953 depend
->target_ip
= NULL
;
2955 } else if ((depend
->flags
& HAMMER_RECF_DELETED_FE
) == 0) {
2957 * Not part of our flush group and not deleted by
2958 * the front-end, adjust the link count synced to
2959 * the media (undo what the frontend did when it
2960 * queued the record).
2962 KKASSERT((depend
->flags
& HAMMER_RECF_DELETED_BE
) == 0);
2963 switch(depend
->type
) {
2964 case HAMMER_MEM_RECORD_ADD
:
2967 case HAMMER_MEM_RECORD_DEL
:
2977 * Set dirty if we had to modify the link count.
2979 if (ip
->sync_ino_data
.nlinks
!= nlinks
) {
2980 KKASSERT((int64_t)nlinks
>= 0);
2981 ip
->sync_ino_data
.nlinks
= nlinks
;
2982 ip
->sync_flags
|= HAMMER_INODE_DDIRTY
;
2986 * If there is a trunction queued destroy any data past the (aligned)
2987 * truncation point. Userland will have dealt with the buffer
2988 * containing the truncation point for us.
2990 * We don't flush pending frontend data buffers until after we've
2991 * dealt with the truncation.
2993 if (ip
->sync_flags
& HAMMER_INODE_TRUNCATED
) {
2995 * Interlock trunc_off. The VOP front-end may continue to
2996 * make adjustments to it while we are blocked.
2999 off_t aligned_trunc_off
;
3002 trunc_off
= ip
->sync_trunc_off
;
3003 blkmask
= hammer_blocksize(trunc_off
) - 1;
3004 aligned_trunc_off
= (trunc_off
+ blkmask
) & ~(int64_t)blkmask
;
3007 * Delete any whole blocks on-media. The front-end has
3008 * already cleaned out any partial block and made it
3009 * pending. The front-end may have updated trunc_off
3010 * while we were blocked so we only use sync_trunc_off.
3012 * This operation can blow out the buffer cache, EWOULDBLOCK
3013 * means we were unable to complete the deletion. The
3014 * deletion will update sync_trunc_off in that case.
3016 error
= hammer_ip_delete_range(&cursor
, ip
,
3019 if (error
== EWOULDBLOCK
) {
3020 ip
->flags
|= HAMMER_INODE_WOULDBLOCK
;
3022 goto defer_buffer_flush
;
3029 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO.
3031 * XXX we do this even if we did not previously generate
3032 * a REDO_TRUNC record. This operation may enclosed the
3033 * range for multiple prior truncation entries in the REDO
3036 if (trans
->hmp
->version
>= HAMMER_VOL_VERSION_FOUR
&&
3037 (ip
->flags
& HAMMER_INODE_RDIRTY
)) {
3038 hammer_generate_redo(trans
, ip
, aligned_trunc_off
,
3039 HAMMER_REDO_TERM_TRUNC
,
3044 * Clear the truncation flag on the backend after we have
3045 * completed the deletions. Backend data is now good again
3046 * (including new records we are about to sync, below).
3048 * Leave sync_trunc_off intact. As we write additional
3049 * records the backend will update sync_trunc_off. This
3050 * tells the backend whether it can skip the overwrite
3051 * test. This should work properly even when the backend
3052 * writes full blocks where the truncation point straddles
3053 * the block because the comparison is against the base
3054 * offset of the record.
3056 ip
->sync_flags
&= ~HAMMER_INODE_TRUNCATED
;
3057 /* ip->sync_trunc_off = HAMMER_MAX_KEY; */
3063 * Now sync related records. These will typically be directory
3064 * entries, records tracking direct-writes, or delete-on-disk records.
3067 tmp_error
= RB_SCAN(hammer_rec_rb_tree
, &ip
->rec_tree
, NULL
,
3068 hammer_sync_record_callback
, &cursor
);
3074 hammer_cache_node(&ip
->cache
[1], cursor
.node
);
3077 * Re-seek for inode update, assuming our cache hasn't been ripped
3078 * out from under us.
3081 tmp_node
= hammer_ref_node_safe(trans
, &ip
->cache
[0], &error
);
3083 hammer_cursor_downgrade(&cursor
);
3084 hammer_lock_sh(&tmp_node
->lock
);
3085 if ((tmp_node
->flags
& HAMMER_NODE_DELETED
) == 0)
3086 hammer_cursor_seek(&cursor
, tmp_node
, 0);
3087 hammer_unlock(&tmp_node
->lock
);
3088 hammer_rel_node(tmp_node
);
3094 * If we are deleting the inode the frontend had better not have
3095 * any active references on elements making up the inode.
3097 * The call to hammer_ip_delete_clean() cleans up auxillary records
3098 * but not DB or DATA records. Those must have already been deleted
3099 * by the normal truncation mechanic.
3101 if (error
== 0 && ip
->sync_ino_data
.nlinks
== 0 &&
3102 RB_EMPTY(&ip
->rec_tree
) &&
3103 (ip
->sync_flags
& HAMMER_INODE_DELETING
) &&
3104 (ip
->flags
& HAMMER_INODE_DELETED
) == 0) {
3107 error
= hammer_ip_delete_clean(&cursor
, ip
, &count1
);
3109 ip
->flags
|= HAMMER_INODE_DELETED
;
3110 ip
->sync_flags
&= ~HAMMER_INODE_DELETING
;
3111 ip
->sync_flags
&= ~HAMMER_INODE_TRUNCATED
;
3112 KKASSERT(RB_EMPTY(&ip
->rec_tree
));
3115 * Set delete_tid in both the frontend and backend
3116 * copy of the inode record. The DELETED flag handles
3117 * this, do not set DDIRTY.
3119 ip
->ino_leaf
.base
.delete_tid
= trans
->tid
;
3120 ip
->sync_ino_leaf
.base
.delete_tid
= trans
->tid
;
3121 ip
->ino_leaf
.delete_ts
= trans
->time32
;
3122 ip
->sync_ino_leaf
.delete_ts
= trans
->time32
;
3126 * Adjust the inode count in the volume header
3128 hammer_sync_lock_sh(trans
);
3129 if (ip
->flags
& HAMMER_INODE_ONDISK
) {
3130 hammer_modify_volume_field(trans
,
3133 --ip
->hmp
->rootvol
->ondisk
->vol0_stat_inodes
;
3134 hammer_modify_volume_done(trans
->rootvol
);
3136 hammer_sync_unlock(trans
);
3142 ip
->sync_flags
&= ~HAMMER_INODE_BUFS
;
3146 * Now update the inode's on-disk inode-data and/or on-disk record.
3147 * DELETED and ONDISK are managed only in ip->flags.
3149 * In the case of a defered buffer flush we still update the on-disk
3150 * inode to satisfy visibility requirements if there happen to be
3151 * directory dependancies.
3153 switch(ip
->flags
& (HAMMER_INODE_DELETED
| HAMMER_INODE_ONDISK
)) {
3154 case HAMMER_INODE_DELETED
|HAMMER_INODE_ONDISK
:
3156 * If deleted and on-disk, don't set any additional flags.
3157 * the delete flag takes care of things.
3159 * Clear flags which may have been set by the frontend.
3161 ip
->sync_flags
&= ~(HAMMER_INODE_DDIRTY
| HAMMER_INODE_XDIRTY
|
3162 HAMMER_INODE_SDIRTY
|
3163 HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
|
3164 HAMMER_INODE_DELETING
);
3166 case HAMMER_INODE_DELETED
:
3168 * Take care of the case where a deleted inode was never
3169 * flushed to the disk in the first place.
3171 * Clear flags which may have been set by the frontend.
3173 ip
->sync_flags
&= ~(HAMMER_INODE_DDIRTY
| HAMMER_INODE_XDIRTY
|
3174 HAMMER_INODE_SDIRTY
|
3175 HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
|
3176 HAMMER_INODE_DELETING
);
3177 while (RB_ROOT(&ip
->rec_tree
)) {
3178 hammer_record_t record
= RB_ROOT(&ip
->rec_tree
);
3179 hammer_ref(&record
->lock
);
3180 KKASSERT(hammer_oneref(&record
->lock
));
3181 record
->flags
|= HAMMER_RECF_DELETED_BE
;
3182 ++record
->ip
->rec_generation
;
3183 hammer_rel_mem_record(record
);
3186 case HAMMER_INODE_ONDISK
:
3188 * If already on-disk, do not set any additional flags.
3193 * If not on-disk and not deleted, set DDIRTY to force
3194 * an initial record to be written.
3196 * Also set the create_tid in both the frontend and backend
3197 * copy of the inode record.
3199 ip
->ino_leaf
.base
.create_tid
= trans
->tid
;
3200 ip
->ino_leaf
.create_ts
= trans
->time32
;
3201 ip
->sync_ino_leaf
.base
.create_tid
= trans
->tid
;
3202 ip
->sync_ino_leaf
.create_ts
= trans
->time32
;
3203 ip
->sync_flags
|= HAMMER_INODE_DDIRTY
;
3208 * If DDIRTY or SDIRTY is set, write out a new record.
3209 * If the inode is already on-disk the old record is marked as
3212 * If DELETED is set hammer_update_inode() will delete the existing
3213 * record without writing out a new one.
3215 if (ip
->flags
& HAMMER_INODE_DELETED
) {
3216 error
= hammer_update_inode(&cursor
, ip
);
3218 if (!(ip
->sync_flags
& (HAMMER_INODE_DDIRTY
| HAMMER_INODE_SDIRTY
)) &&
3219 (ip
->sync_flags
& (HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
))) {
3220 error
= hammer_update_itimes(&cursor
, ip
);
3222 if (ip
->sync_flags
& (HAMMER_INODE_DDIRTY
| HAMMER_INODE_SDIRTY
|
3223 HAMMER_INODE_ATIME
| HAMMER_INODE_MTIME
)) {
3224 error
= hammer_update_inode(&cursor
, ip
);
3227 if (ip
->flags
& HAMMER_INODE_MODMASK
)
3228 hammer_inode_dirty(ip
);
3230 hammer_critical_error(ip
->hmp
, ip
, error
,
3231 "while syncing inode");
3233 hammer_done_cursor(&cursor
);
3238 * This routine is called when the OS is no longer actively referencing
3239 * the inode (but might still be keeping it cached), or when releasing
3240 * the last reference to an inode.
3242 * At this point if the inode's nlinks count is zero we want to destroy
3243 * it, which may mean destroying it on-media too.
3246 hammer_inode_unloadable_check(hammer_inode_t ip
, int getvp
)
3251 * Set the DELETING flag when the link count drops to 0 and the
3252 * OS no longer has any opens on the inode.
3254 * The backend will clear DELETING (a mod flag) and set DELETED
3255 * (a state flag) when it is actually able to perform the
3258 * Don't reflag the deletion if the flusher is currently syncing
3259 * one that was already flagged. A previously set DELETING flag
3260 * may bounce around flags and sync_flags until the operation is
3263 * Do not attempt to modify a snapshot inode (one set to read-only).
3265 if (ip
->ino_data
.nlinks
== 0 &&
3266 ((ip
->flags
| ip
->sync_flags
) & (HAMMER_INODE_RO
|HAMMER_INODE_DELETING
|HAMMER_INODE_DELETED
)) == 0) {
3267 ip
->flags
|= HAMMER_INODE_DELETING
;
3268 ip
->flags
|= HAMMER_INODE_TRUNCATED
;
3272 if (hammer_get_vnode(ip
, &vp
) != 0)
3280 nvtruncbuf(ip
->vp
, 0, HAMMER_BUFSIZE
, 0, 0);
3281 if (ip
->flags
& HAMMER_INODE_MODMASK
)
3282 hammer_inode_dirty(ip
);
3289 * After potentially resolving a dependancy the inode is tested
3290 * to determine whether it needs to be reflushed.
3293 hammer_test_inode(hammer_inode_t ip
)
3295 if (ip
->flags
& HAMMER_INODE_REFLUSH
) {
3296 ip
->flags
&= ~HAMMER_INODE_REFLUSH
;
3297 hammer_ref(&ip
->lock
);
3298 if (ip
->flags
& HAMMER_INODE_RESIGNAL
) {
3299 ip
->flags
&= ~HAMMER_INODE_RESIGNAL
;
3300 hammer_flush_inode(ip
, HAMMER_FLUSH_SIGNAL
);
3302 hammer_flush_inode(ip
, 0);
3304 hammer_rel_inode(ip
, 0);
3309 * Clear the RECLAIM flag on an inode. This occurs when the inode is
3310 * reassociated with a vp or just before it gets freed.
3312 * Pipeline wakeups to threads blocked due to an excessive number of
3313 * detached inodes. This typically occurs when atime updates accumulate
3314 * while scanning a directory tree.
3317 hammer_inode_wakereclaims(hammer_inode_t ip
)
3319 struct hammer_reclaim
*reclaim
;
3320 hammer_mount_t hmp
= ip
->hmp
;
3322 if ((ip
->flags
& HAMMER_INODE_RECLAIM
) == 0)
3325 --hammer_count_reclaims
;
3326 --hmp
->count_reclaims
;
3327 ip
->flags
&= ~HAMMER_INODE_RECLAIM
;
3329 if ((reclaim
= TAILQ_FIRST(&hmp
->reclaim_list
)) != NULL
) {
3330 KKASSERT(reclaim
->count
> 0);
3331 if (--reclaim
->count
== 0) {
3332 TAILQ_REMOVE(&hmp
->reclaim_list
, reclaim
, entry
);
3339 * Setup our reclaim pipeline. We only let so many detached (and dirty)
3340 * inodes build up before we start blocking. This routine is called
3341 * if a new inode is created or an inode is loaded from media.
3343 * When we block we don't care *which* inode has finished reclaiming,
3344 * as long as one does.
3346 * The reclaim pipeline is primarily governed by the auto-flush which is
3347 * 1/4 hammer_limit_reclaims. We don't want to block if the count is
3348 * less than 1/2 hammer_limit_reclaims. From 1/2 to full count is
3349 * dynamically governed.
3352 hammer_inode_waitreclaims(hammer_transaction_t trans
)
3354 hammer_mount_t hmp
= trans
->hmp
;
3355 struct hammer_reclaim reclaim
;
3359 * Track inode load, delay if the number of reclaiming inodes is
3360 * between 2/4 and 4/4 hammer_limit_reclaims, depending.
3362 if (curthread
->td_proc
) {
3363 struct hammer_inostats
*stats
;
3365 stats
= hammer_inode_inostats(hmp
, curthread
->td_proc
->p_pid
);
3368 if (stats
->count
> hammer_limit_reclaims
/ 2)
3369 stats
->count
= hammer_limit_reclaims
/ 2;
3370 lower_limit
= hammer_limit_reclaims
- stats
->count
;
3371 if (hammer_debug_general
& 0x10000) {
3372 hdkprintf("pid %5d limit %d\n",
3373 (int)curthread
->td_proc
->p_pid
, lower_limit
);
3376 lower_limit
= hammer_limit_reclaims
* 3 / 4;
3378 if (hmp
->count_reclaims
>= lower_limit
) {
3380 TAILQ_INSERT_TAIL(&hmp
->reclaim_list
, &reclaim
, entry
);
3381 tsleep(&reclaim
, 0, "hmrrcm", hz
);
3382 if (reclaim
.count
> 0)
3383 TAILQ_REMOVE(&hmp
->reclaim_list
, &reclaim
, entry
);
3388 * Keep track of reclaim statistics on a per-pid basis using a loose
3389 * 4-way set associative hash table. Collisions inherit the count of
3390 * the previous entry.
3392 * NOTE: We want to be careful here to limit the chain size. If the chain
3393 * size is too large a pid will spread its stats out over too many
3394 * entries under certain types of heavy filesystem activity and
3395 * wind up not delaying long enough.
3398 struct hammer_inostats
*
3399 hammer_inode_inostats(hammer_mount_t hmp
, pid_t pid
)
3401 struct hammer_inostats
*stats
;
3404 static volatile int iterator
; /* we don't care about MP races */
3407 * Chain up to 4 times to find our entry.
3409 for (chain
= 0; chain
< 4; ++chain
) {
3410 stats
= &hmp
->inostats
[(pid
+ chain
) & HAMMER_INOSTATS_HMASK
];
3411 if (stats
->pid
== pid
)
3416 * Replace one of the four chaining entries with our new entry.
3419 stats
= &hmp
->inostats
[(pid
+ (iterator
++ & 3)) &
3420 HAMMER_INOSTATS_HMASK
];
3427 if (stats
->count
&& stats
->ltick
!= ticks
) {
3428 delta
= ticks
- stats
->ltick
;
3429 stats
->ltick
= ticks
;
3430 if (delta
<= 0 || delta
> hz
* 60)
3433 stats
->count
= stats
->count
* hz
/ (hz
+ delta
);
3435 if (hammer_debug_general
& 0x10000)
3436 hdkprintf("pid %5d stats %d\n", (int)pid
, stats
->count
);
3443 * XXX not used, doesn't work very well due to the large batching nature
3446 * A larger then normal backlog of inodes is sitting in the flusher,
3447 * enforce a general slowdown to let it catch up. This routine is only
3448 * called on completion of a non-flusher-related transaction which
3449 * performed B-Tree node I/O.
3451 * It is possible for the flusher to stall in a continuous load.
3452 * blogbench -i1000 -o seems to do a good job generating this sort of load.
3453 * If the flusher is unable to catch up the inode count can bloat until
3454 * we run out of kvm.
3456 * This is a bit of a hack.
3459 hammer_inode_waithard(hammer_mount_t hmp
)
3464 if (hmp
->flags
& HAMMER_MOUNT_FLUSH_RECOVERY
) {
3465 if (hmp
->count_reclaims
< hammer_limit_reclaims
/ 2 &&
3466 hmp
->count_iqueued
< hmp
->count_inodes
/ 20) {
3467 hmp
->flags
&= ~HAMMER_MOUNT_FLUSH_RECOVERY
;
3471 if (hmp
->count_reclaims
< hammer_limit_reclaims
||
3472 hmp
->count_iqueued
< hmp
->count_inodes
/ 10) {
3475 hmp
->flags
|= HAMMER_MOUNT_FLUSH_RECOVERY
;
3479 * Block for one flush cycle.
3481 hammer_flusher_wait_next(hmp
);