2 * Copyright 1998, 2000 Marshall Kirk McKusick. All Rights Reserved.
4 * The soft updates code is derived from the appendix of a University
5 * of Michigan technical report (Gregory R. Ganger and Yale N. Patt,
6 * "Soft Updates: A Solution to the Metadata Update Problem in File
7 * Systems", CSE-TR-254-95, August 1995).
9 * Further information about soft updates can be obtained from:
11 * Marshall Kirk McKusick http://www.mckusick.com/softdep/
12 * 1614 Oxford Street mckusick@mckusick.com
13 * Berkeley, CA 94709-1608 +1-510-843-9542
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
27 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
29 * DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: @(#)ffs_softdep.c 9.59 (McKusick) 6/21/00
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
45 * For now we want the safety net that the DEBUG flag provides.
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/systm.h>
57 #include <sys/kthread.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/mutex.h>
64 #include <sys/sysctl.h>
65 #include <sys/syslog.h>
66 #include <sys/vnode.h>
68 #include <ufs/ufs/dir.h>
69 #include <ufs/ufs/extattr.h>
70 #include <ufs/ufs/quota.h>
71 #include <ufs/ufs/inode.h>
72 #include <ufs/ufs/ufsmount.h>
73 #include <ufs/ffs/fs.h>
74 #include <ufs/ffs/softdep.h>
75 #include <ufs/ffs/ffs_extern.h>
76 #include <ufs/ufs/ufs_extern.h>
85 softdep_flushfiles(oldmnt, flags, td)
91 panic("softdep_flushfiles called");
95 softdep_mount(devvp, mp, fs, cred)
113 softdep_uninitialize()
120 softdep_setup_inomapdep(bp, ip, newinum)
126 panic("softdep_setup_inomapdep called");
130 softdep_setup_blkmapdep(bp, mp, newblkno)
133 ufs2_daddr_t newblkno;
136 panic("softdep_setup_blkmapdep called");
140 softdep_setup_allocdirect(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
143 ufs2_daddr_t newblkno;
144 ufs2_daddr_t oldblkno;
150 panic("softdep_setup_allocdirect called");
154 softdep_setup_allocext(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
157 ufs2_daddr_t newblkno;
158 ufs2_daddr_t oldblkno;
164 panic("softdep_setup_allocext called");
168 softdep_setup_allocindir_page(ip, lbn, bp, ptrno, newblkno, oldblkno, nbp)
173 ufs2_daddr_t newblkno;
174 ufs2_daddr_t oldblkno;
178 panic("softdep_setup_allocindir_page called");
182 softdep_setup_allocindir_meta(nbp, ip, bp, ptrno, newblkno)
187 ufs2_daddr_t newblkno;
190 panic("softdep_setup_allocindir_meta called");
194 softdep_setup_freeblocks(ip, length, flags)
200 panic("softdep_setup_freeblocks called");
204 softdep_freefile(pvp, ino, mode)
210 panic("softdep_freefile called");
214 softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp, isnewblk)
219 struct buf *newdirbp;
223 panic("softdep_setup_directory_add called");
227 softdep_change_directoryentry_offset(dp, base, oldloc, newloc, entrysize)
235 panic("softdep_change_directoryentry_offset called");
239 softdep_setup_remove(bp, dp, ip, isrmdir)
246 panic("softdep_setup_remove called");
250 softdep_setup_directory_change(bp, dp, ip, newinum, isrmdir)
258 panic("softdep_setup_directory_change called");
262 softdep_change_linkcnt(ip)
266 panic("softdep_change_linkcnt called");
270 softdep_load_inodeblock(ip)
274 panic("softdep_load_inodeblock called");
278 softdep_update_inodeblock(ip, bp, waitfor)
284 panic("softdep_update_inodeblock called");
289 struct vnode *vp; /* the "in_core" copy of the inode */
296 softdep_fsync_mountdev(vp)
304 softdep_flushworklist(oldmnt, countp, td)
305 struct mount *oldmnt;
315 softdep_sync_metadata(struct vnode *vp)
326 panic("softdep_slowdown called");
330 softdep_releasefile(ip)
331 struct inode *ip; /* inode with the zero effective link count */
334 panic("softdep_releasefile called");
338 softdep_request_cleanup(fs, vp)
347 softdep_check_suspend(struct mount *mp,
351 int secondary_writes,
352 int secondary_accwrites)
358 (void) softdep_accdeps;
360 bo = &devvp->v_bufobj;
361 ASSERT_BO_LOCKED(bo);
364 while (mp->mnt_secondary_writes != 0) {
366 msleep(&mp->mnt_secondary_writes, MNT_MTX(mp),
367 (PUSER - 1) | PDROP, "secwr", 0);
373 * Reasons for needing more work before suspend:
374 * - Dirty buffers on devvp.
375 * - Secondary writes occurred after start of vnode sync loop
378 if (bo->bo_numoutput > 0 ||
379 bo->bo_dirty.bv_cnt > 0 ||
380 secondary_writes != 0 ||
381 mp->mnt_secondary_writes != 0 ||
382 secondary_accwrites != mp->mnt_secondary_accwrites)
389 softdep_get_depcounts(struct mount *mp,
391 int *softdepactiveaccp)
395 *softdepactiveaccp = 0;
400 * These definitions need to be adapted to the system to which
401 * this file is being ported.
404 * malloc types defined for the softdep system.
406 static MALLOC_DEFINE(M_PAGEDEP, "pagedep","File page dependencies");
407 static MALLOC_DEFINE(M_INODEDEP, "inodedep","Inode dependencies");
408 static MALLOC_DEFINE(M_NEWBLK, "newblk","New block allocation");
409 static MALLOC_DEFINE(M_BMSAFEMAP, "bmsafemap","Block or frag allocated from cyl group map");
410 static MALLOC_DEFINE(M_ALLOCDIRECT, "allocdirect","Block or frag dependency for an inode");
411 static MALLOC_DEFINE(M_INDIRDEP, "indirdep","Indirect block dependencies");
412 static MALLOC_DEFINE(M_ALLOCINDIR, "allocindir","Block dependency for an indirect block");
413 static MALLOC_DEFINE(M_FREEFRAG, "freefrag","Previously used frag for an inode");
414 static MALLOC_DEFINE(M_FREEBLKS, "freeblks","Blocks freed from an inode");
415 static MALLOC_DEFINE(M_FREEFILE, "freefile","Inode deallocated");
416 static MALLOC_DEFINE(M_DIRADD, "diradd","New directory entry");
417 static MALLOC_DEFINE(M_MKDIR, "mkdir","New directory");
418 static MALLOC_DEFINE(M_DIRREM, "dirrem","Directory entry deleted");
419 static MALLOC_DEFINE(M_NEWDIRBLK, "newdirblk","Unclaimed new directory block");
420 static MALLOC_DEFINE(M_SAVEDINO, "savedino","Saved inodes");
422 #define M_SOFTDEP_FLAGS (M_WAITOK | M_USE_RESERVE)
427 #define D_BMSAFEMAP 3
428 #define D_ALLOCDIRECT 4
430 #define D_ALLOCINDIR 6
437 #define D_NEWDIRBLK 13
438 #define D_LAST D_NEWDIRBLK
441 * translate from workitem type to memory type
442 * MUST match the defines above, such that memtype[D_XXX] == M_XXX
444 static struct malloc_type *memtype[] = {
461 #define DtoM(type) (memtype[type])
464 * Names of malloc types.
466 #define TYPENAME(type) \
467 ((unsigned)(type) < D_LAST ? memtype[type]->ks_shortdesc : "???")
469 * End system adaptation definitions.
473 * Forward declarations.
475 struct inodedep_hashhead;
476 struct newblk_hashhead;
477 struct pagedep_hashhead;
480 * Internal function prototypes.
482 static void softdep_error(char *, int);
483 static void drain_output(struct vnode *);
484 static struct buf *getdirtybuf(struct buf *, struct mtx *, int);
485 static void clear_remove(struct thread *);
486 static void clear_inodedeps(struct thread *);
487 static int flush_pagedep_deps(struct vnode *, struct mount *,
489 static int flush_inodedep_deps(struct mount *, ino_t);
490 static int flush_deplist(struct allocdirectlst *, int, int *);
491 static int handle_written_filepage(struct pagedep *, struct buf *);
492 static void diradd_inode_written(struct diradd *, struct inodedep *);
493 static int handle_written_inodeblock(struct inodedep *, struct buf *);
494 static void handle_allocdirect_partdone(struct allocdirect *);
495 static void handle_allocindir_partdone(struct allocindir *);
496 static void initiate_write_filepage(struct pagedep *, struct buf *);
497 static void handle_written_mkdir(struct mkdir *, int);
498 static void initiate_write_inodeblock_ufs1(struct inodedep *, struct buf *);
499 static void initiate_write_inodeblock_ufs2(struct inodedep *, struct buf *);
500 static void handle_workitem_freefile(struct freefile *);
501 static void handle_workitem_remove(struct dirrem *, struct vnode *);
502 static struct dirrem *newdirrem(struct buf *, struct inode *,
503 struct inode *, int, struct dirrem **);
504 static void free_diradd(struct diradd *);
505 static void free_allocindir(struct allocindir *, struct inodedep *);
506 static void free_newdirblk(struct newdirblk *);
507 static int indir_trunc(struct freeblks *, ufs2_daddr_t, int, ufs_lbn_t,
509 static void deallocate_dependencies(struct buf *, struct inodedep *);
510 static void free_allocdirect(struct allocdirectlst *,
511 struct allocdirect *, int);
512 static int check_inode_unwritten(struct inodedep *);
513 static int free_inodedep(struct inodedep *);
514 static void handle_workitem_freeblocks(struct freeblks *, int);
515 static void merge_inode_lists(struct allocdirectlst *,struct allocdirectlst *);
516 static void setup_allocindir_phase2(struct buf *, struct inode *,
517 struct allocindir *);
518 static struct allocindir *newallocindir(struct inode *, int, ufs2_daddr_t,
520 static void handle_workitem_freefrag(struct freefrag *);
521 static struct freefrag *newfreefrag(struct inode *, ufs2_daddr_t, long);
522 static void allocdirect_merge(struct allocdirectlst *,
523 struct allocdirect *, struct allocdirect *);
524 static struct bmsafemap *bmsafemap_lookup(struct mount *, struct buf *);
525 static int newblk_find(struct newblk_hashhead *, struct fs *, ufs2_daddr_t,
527 static int newblk_lookup(struct fs *, ufs2_daddr_t, int, struct newblk **);
528 static int inodedep_find(struct inodedep_hashhead *, struct fs *, ino_t,
530 static int inodedep_lookup(struct mount *, ino_t, int, struct inodedep **);
531 static int pagedep_lookup(struct inode *, ufs_lbn_t, int, struct pagedep **);
532 static int pagedep_find(struct pagedep_hashhead *, ino_t, ufs_lbn_t,
533 struct mount *mp, int, struct pagedep **);
534 static void pause_timer(void *);
535 static int request_cleanup(struct mount *, int);
536 static int process_worklist_item(struct mount *, int);
537 static void add_to_worklist(struct worklist *);
538 static void softdep_flush(void);
539 static int softdep_speedup(void);
542 * Exported softdep operations.
544 static void softdep_disk_io_initiation(struct buf *);
545 static void softdep_disk_write_complete(struct buf *);
546 static void softdep_deallocate_dependencies(struct buf *);
547 static int softdep_count_dependencies(struct buf *bp, int);
549 static struct mtx lk;
550 MTX_SYSINIT(softdep_lock, &lk, "Softdep Lock", MTX_DEF);
552 #define TRY_ACQUIRE_LOCK(lk) mtx_trylock(lk)
553 #define ACQUIRE_LOCK(lk) mtx_lock(lk)
554 #define FREE_LOCK(lk) mtx_unlock(lk)
556 #define BUF_AREC(bp) ((bp)->b_lock.lock_object.lo_flags |= LK_CANRECURSE)
557 #define BUF_NOREC(bp) ((bp)->b_lock.lock_object.lo_flags &= ~LK_CANRECURSE)
560 * Worklist queue management.
561 * These routines require that the lock be held.
563 #ifndef /* NOT */ DEBUG
564 #define WORKLIST_INSERT(head, item) do { \
565 (item)->wk_state |= ONWORKLIST; \
566 LIST_INSERT_HEAD(head, item, wk_list); \
568 #define WORKLIST_REMOVE(item) do { \
569 (item)->wk_state &= ~ONWORKLIST; \
570 LIST_REMOVE(item, wk_list); \
573 static void worklist_insert(struct workhead *, struct worklist *);
574 static void worklist_remove(struct worklist *);
576 #define WORKLIST_INSERT(head, item) worklist_insert(head, item)
577 #define WORKLIST_REMOVE(item) worklist_remove(item)
580 worklist_insert(head, item)
581 struct workhead *head;
582 struct worklist *item;
585 mtx_assert(&lk, MA_OWNED);
586 if (item->wk_state & ONWORKLIST)
587 panic("worklist_insert: already on list");
588 item->wk_state |= ONWORKLIST;
589 LIST_INSERT_HEAD(head, item, wk_list);
593 worklist_remove(item)
594 struct worklist *item;
597 mtx_assert(&lk, MA_OWNED);
598 if ((item->wk_state & ONWORKLIST) == 0)
599 panic("worklist_remove: not on list");
600 item->wk_state &= ~ONWORKLIST;
601 LIST_REMOVE(item, wk_list);
606 * Routines for tracking and managing workitems.
608 static void workitem_free(struct worklist *, int);
609 static void workitem_alloc(struct worklist *, int, struct mount *);
611 #define WORKITEM_FREE(item, type) workitem_free((struct worklist *)(item), (type))
614 workitem_free(item, type)
615 struct worklist *item;
618 struct ufsmount *ump;
619 mtx_assert(&lk, MA_OWNED);
622 if (item->wk_state & ONWORKLIST)
623 panic("workitem_free: still on list");
624 if (item->wk_type != type)
625 panic("workitem_free: type mismatch");
627 ump = VFSTOUFS(item->wk_mp);
628 if (--ump->softdep_deps == 0 && ump->softdep_req)
629 wakeup(&ump->softdep_deps);
630 FREE(item, DtoM(type));
634 workitem_alloc(item, type, mp)
635 struct worklist *item;
639 item->wk_type = type;
643 VFSTOUFS(mp)->softdep_deps++;
644 VFSTOUFS(mp)->softdep_accdeps++;
649 * Workitem queue management
651 static int max_softdeps; /* maximum number of structs before slowdown */
652 static int maxindirdeps = 50; /* max number of indirdeps before slowdown */
653 static int tickdelay = 2; /* number of ticks to pause during slowdown */
654 static int proc_waiting; /* tracks whether we have a timeout posted */
655 static int *stat_countp; /* statistic to count in proc_waiting timeout */
656 static struct callout softdep_callout;
657 static int req_pending;
658 static int req_clear_inodedeps; /* syncer process flush some inodedeps */
659 #define FLUSH_INODES 1
660 static int req_clear_remove; /* syncer process flush some freeblks */
661 #define FLUSH_REMOVE 2
662 #define FLUSH_REMOVE_WAIT 3
666 static int stat_worklist_push; /* number of worklist cleanups */
667 static int stat_blk_limit_push; /* number of times block limit neared */
668 static int stat_ino_limit_push; /* number of times inode limit neared */
669 static int stat_blk_limit_hit; /* number of times block slowdown imposed */
670 static int stat_ino_limit_hit; /* number of times inode slowdown imposed */
671 static int stat_sync_limit_hit; /* number of synchronous slowdowns imposed */
672 static int stat_indir_blk_ptrs; /* bufs redirtied as indir ptrs not written */
673 static int stat_inode_bitmap; /* bufs redirtied as inode bitmap not written */
674 static int stat_direct_blk_ptrs;/* bufs redirtied as direct ptrs not written */
675 static int stat_dir_entry; /* bufs redirtied as dir entry cannot write */
677 SYSCTL_INT(_debug, OID_AUTO, max_softdeps, CTLFLAG_RW, &max_softdeps, 0, "");
678 SYSCTL_INT(_debug, OID_AUTO, tickdelay, CTLFLAG_RW, &tickdelay, 0, "");
679 SYSCTL_INT(_debug, OID_AUTO, maxindirdeps, CTLFLAG_RW, &maxindirdeps, 0, "");
680 SYSCTL_INT(_debug, OID_AUTO, worklist_push, CTLFLAG_RW, &stat_worklist_push, 0,"");
681 SYSCTL_INT(_debug, OID_AUTO, blk_limit_push, CTLFLAG_RW, &stat_blk_limit_push, 0,"");
682 SYSCTL_INT(_debug, OID_AUTO, ino_limit_push, CTLFLAG_RW, &stat_ino_limit_push, 0,"");
683 SYSCTL_INT(_debug, OID_AUTO, blk_limit_hit, CTLFLAG_RW, &stat_blk_limit_hit, 0, "");
684 SYSCTL_INT(_debug, OID_AUTO, ino_limit_hit, CTLFLAG_RW, &stat_ino_limit_hit, 0, "");
685 SYSCTL_INT(_debug, OID_AUTO, sync_limit_hit, CTLFLAG_RW, &stat_sync_limit_hit, 0, "");
686 SYSCTL_INT(_debug, OID_AUTO, indir_blk_ptrs, CTLFLAG_RW, &stat_indir_blk_ptrs, 0, "");
687 SYSCTL_INT(_debug, OID_AUTO, inode_bitmap, CTLFLAG_RW, &stat_inode_bitmap, 0, "");
688 SYSCTL_INT(_debug, OID_AUTO, direct_blk_ptrs, CTLFLAG_RW, &stat_direct_blk_ptrs, 0, "");
689 SYSCTL_INT(_debug, OID_AUTO, dir_entry, CTLFLAG_RW, &stat_dir_entry, 0, "");
690 /* SYSCTL_INT(_debug, OID_AUTO, worklist_num, CTLFLAG_RD, &softdep_on_worklist, 0, ""); */
692 SYSCTL_DECL(_vfs_ffs);
694 static int compute_summary_at_mount = 0; /* Whether to recompute the summary at mount time */
695 SYSCTL_INT(_vfs_ffs, OID_AUTO, compute_summary_at_mount, CTLFLAG_RW,
696 &compute_summary_at_mount, 0, "Recompute summary at mount");
698 static struct proc *softdepproc;
699 static struct kproc_desc softdep_kp = {
704 SYSINIT(sdproc, SI_SUB_KTHREAD_UPDATE, SI_ORDER_ANY, kproc_start,
712 struct ufsmount *ump;
718 td->td_pflags |= TDP_NORUNNINGBUF;
721 kproc_suspend_check(softdepproc);
722 vfslocked = VFS_LOCK_GIANT((struct mount *)NULL);
725 * If requested, try removing inode or removal dependencies.
727 if (req_clear_inodedeps) {
729 req_clear_inodedeps -= 1;
730 wakeup_one(&proc_waiting);
732 if (req_clear_remove) {
734 req_clear_remove -= 1;
735 wakeup_one(&proc_waiting);
738 VFS_UNLOCK_GIANT(vfslocked);
740 mtx_lock(&mountlist_mtx);
741 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
742 nmp = TAILQ_NEXT(mp, mnt_list);
743 if ((mp->mnt_flag & MNT_SOFTDEP) == 0)
745 if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td))
747 vfslocked = VFS_LOCK_GIANT(mp);
748 softdep_process_worklist(mp, 0);
750 remaining += ump->softdep_on_worklist -
751 ump->softdep_on_worklist_inprogress;
752 VFS_UNLOCK_GIANT(vfslocked);
753 mtx_lock(&mountlist_mtx);
754 nmp = TAILQ_NEXT(mp, mnt_list);
757 mtx_unlock(&mountlist_mtx);
762 msleep(&req_pending, &lk, PVM, "sdflush", hz);
769 softdep_speedup(void)
772 mtx_assert(&lk, MA_OWNED);
773 if (req_pending == 0) {
775 wakeup(&req_pending);
778 return speedup_syncer();
782 * Add an item to the end of the work queue.
783 * This routine requires that the lock be held.
784 * This is the only routine that adds items to the list.
785 * The following routine is the only one that removes items
786 * and does so in order from first to last.
792 struct ufsmount *ump;
794 mtx_assert(&lk, MA_OWNED);
795 ump = VFSTOUFS(wk->wk_mp);
796 if (wk->wk_state & ONWORKLIST)
797 panic("add_to_worklist: already on list");
798 wk->wk_state |= ONWORKLIST;
799 if (LIST_EMPTY(&ump->softdep_workitem_pending))
800 LIST_INSERT_HEAD(&ump->softdep_workitem_pending, wk, wk_list);
802 LIST_INSERT_AFTER(ump->softdep_worklist_tail, wk, wk_list);
803 ump->softdep_worklist_tail = wk;
804 ump->softdep_on_worklist += 1;
808 * Process that runs once per second to handle items in the background queue.
810 * Note that we ensure that everything is done in the order in which they
811 * appear in the queue. The code below depends on this property to ensure
812 * that blocks of a file are freed before the inode itself is freed. This
813 * ordering ensures that no new <vfsid, inum, lbn> triples will be generated
814 * until all the old ones have been purged from the dependency lists.
817 softdep_process_worklist(mp, full)
821 struct thread *td = curthread;
822 int cnt, matchcnt, loopcount;
823 struct ufsmount *ump;
826 KASSERT(mp != NULL, ("softdep_process_worklist: NULL mp"));
828 * Record the process identifier of our caller so that we can give
829 * this process preferential treatment in request_cleanup below.
835 starttime = time_second;
836 while (ump->softdep_on_worklist > 0) {
837 if ((cnt = process_worklist_item(mp, 0)) == -1)
842 * If requested, try removing inode or removal dependencies.
844 if (req_clear_inodedeps) {
846 req_clear_inodedeps -= 1;
847 wakeup_one(&proc_waiting);
849 if (req_clear_remove) {
851 req_clear_remove -= 1;
852 wakeup_one(&proc_waiting);
855 * We do not generally want to stop for buffer space, but if
856 * we are really being a buffer hog, we will stop and wait.
858 if (loopcount++ % 128 == 0) {
865 * Never allow processing to run for more than one
866 * second. Otherwise the other mountpoints may get
867 * excessively backlogged.
869 if (!full && starttime != time_second) {
879 * Process one item on the worklist.
882 process_worklist_item(mp, flags)
886 struct worklist *wk, *wkend;
887 struct ufsmount *ump;
891 mtx_assert(&lk, MA_OWNED);
892 KASSERT(mp != NULL, ("process_worklist_item: NULL mp"));
894 * If we are being called because of a process doing a
895 * copy-on-write, then it is not safe to write as we may
896 * recurse into the copy-on-write routine.
898 if (curthread->td_pflags & TDP_COWINPROGRESS)
901 * Normally we just process each item on the worklist in order.
902 * However, if we are in a situation where we cannot lock any
903 * inodes, we have to skip over any dirrem requests whose
904 * vnodes are resident and locked.
908 LIST_FOREACH(wk, &ump->softdep_workitem_pending, wk_list) {
909 if (wk->wk_state & INPROGRESS)
911 if ((flags & LK_NOWAIT) == 0 || wk->wk_type != D_DIRREM)
913 wk->wk_state |= INPROGRESS;
914 ump->softdep_on_worklist_inprogress++;
916 ffs_vget(mp, WK_DIRREM(wk)->dm_oldinum,
917 LK_NOWAIT | LK_EXCLUSIVE, &vp);
919 wk->wk_state &= ~INPROGRESS;
920 ump->softdep_on_worklist_inprogress--;
927 * Remove the item to be processed. If we are removing the last
928 * item on the list, we need to recalculate the tail pointer.
929 * As this happens rarely and usually when the list is short,
930 * we just run down the list to find it rather than tracking it
934 if (wk == ump->softdep_worklist_tail) {
935 LIST_FOREACH(wkend, &ump->softdep_workitem_pending, wk_list)
936 if (LIST_NEXT(wkend, wk_list) == NULL)
938 ump->softdep_worklist_tail = wkend;
940 ump->softdep_on_worklist -= 1;
942 if (vn_start_secondary_write(NULL, &mp, V_NOWAIT))
943 panic("process_worklist_item: suspended filesystem");
945 switch (wk->wk_type) {
948 /* removal of a directory entry */
949 handle_workitem_remove(WK_DIRREM(wk), vp);
953 /* releasing blocks and/or fragments from a file */
954 handle_workitem_freeblocks(WK_FREEBLKS(wk), flags & LK_NOWAIT);
958 /* releasing a fragment when replaced as a file grows */
959 handle_workitem_freefrag(WK_FREEFRAG(wk));
963 /* releasing an inode when its link count drops to 0 */
964 handle_workitem_freefile(WK_FREEFILE(wk));
968 panic("%s_process_worklist: Unknown type %s",
969 "softdep", TYPENAME(wk->wk_type));
972 vn_finished_secondary_write(mp);
978 * Move dependencies from one buffer to another.
981 softdep_move_dependencies(oldbp, newbp)
985 struct worklist *wk, *wktail;
987 if (!LIST_EMPTY(&newbp->b_dep))
988 panic("softdep_move_dependencies: need merge code");
991 while ((wk = LIST_FIRST(&oldbp->b_dep)) != NULL) {
992 LIST_REMOVE(wk, wk_list);
994 LIST_INSERT_HEAD(&newbp->b_dep, wk, wk_list);
996 LIST_INSERT_AFTER(wktail, wk, wk_list);
1003 * Purge the work list of all items associated with a particular mount point.
1006 softdep_flushworklist(oldmnt, countp, td)
1007 struct mount *oldmnt;
1011 struct vnode *devvp;
1012 int count, error = 0;
1013 struct ufsmount *ump;
1016 * Alternately flush the block device associated with the mount
1017 * point and process any dependencies that the flushing
1018 * creates. We continue until no more worklist dependencies
1022 ump = VFSTOUFS(oldmnt);
1023 devvp = ump->um_devvp;
1024 while ((count = softdep_process_worklist(oldmnt, 1)) > 0) {
1026 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1027 error = VOP_FSYNC(devvp, MNT_WAIT, td);
1028 VOP_UNLOCK(devvp, 0);
1036 softdep_waitidle(struct mount *mp)
1038 struct ufsmount *ump;
1044 for (i = 0; i < 10 && ump->softdep_deps; i++) {
1045 ump->softdep_req = 1;
1046 if (ump->softdep_on_worklist)
1047 panic("softdep_waitidle: work added after flush.");
1048 msleep(&ump->softdep_deps, &lk, PVM, "softdeps", 1);
1050 ump->softdep_req = 0;
1055 printf("softdep_waitidle: Failed to flush worklist for %p\n",
1063 * Flush all vnodes and worklist items associated with a specified mount point.
1066 softdep_flushfiles(oldmnt, flags, td)
1067 struct mount *oldmnt;
1071 int error, count, loopcnt;
1076 * Alternately flush the vnodes associated with the mount
1077 * point and process any dependencies that the flushing
1078 * creates. In theory, this loop can happen at most twice,
1079 * but we give it a few extra just to be sure.
1081 for (loopcnt = 10; loopcnt > 0; loopcnt--) {
1083 * Do another flush in case any vnodes were brought in
1084 * as part of the cleanup operations.
1086 if ((error = ffs_flushfiles(oldmnt, flags, td)) != 0)
1088 if ((error = softdep_flushworklist(oldmnt, &count, td)) != 0 ||
1093 * If we are unmounting then it is an error to fail. If we
1094 * are simply trying to downgrade to read-only, then filesystem
1095 * activity can keep us busy forever, so we just fail with EBUSY.
1098 if (oldmnt->mnt_kern_flag & MNTK_UNMOUNT)
1099 panic("softdep_flushfiles: looping");
1103 error = softdep_waitidle(oldmnt);
1108 * Structure hashing.
1110 * There are three types of structures that can be looked up:
1111 * 1) pagedep structures identified by mount point, inode number,
1112 * and logical block.
1113 * 2) inodedep structures identified by mount point and inode number.
1114 * 3) newblk structures identified by mount point and
1115 * physical block number.
1117 * The "pagedep" and "inodedep" dependency structures are hashed
1118 * separately from the file blocks and inodes to which they correspond.
1119 * This separation helps when the in-memory copy of an inode or
1120 * file block must be replaced. It also obviates the need to access
1121 * an inode or file page when simply updating (or de-allocating)
1122 * dependency structures. Lookup of newblk structures is needed to
1123 * find newly allocated blocks when trying to associate them with
1124 * their allocdirect or allocindir structure.
1126 * The lookup routines optionally create and hash a new instance when
1127 * an existing entry is not found.
1129 #define DEPALLOC 0x0001 /* allocate structure if lookup fails */
1130 #define NODELAY 0x0002 /* cannot do background work */
1133 * Structures and routines associated with pagedep caching.
1135 LIST_HEAD(pagedep_hashhead, pagedep) *pagedep_hashtbl;
1136 u_long pagedep_hash; /* size of hash table - 1 */
1137 #define PAGEDEP_HASH(mp, inum, lbn) \
1138 (&pagedep_hashtbl[((((register_t)(mp)) >> 13) + (inum) + (lbn)) & \
1142 pagedep_find(pagedephd, ino, lbn, mp, flags, pagedeppp)
1143 struct pagedep_hashhead *pagedephd;
1148 struct pagedep **pagedeppp;
1150 struct pagedep *pagedep;
1152 LIST_FOREACH(pagedep, pagedephd, pd_hash)
1153 if (ino == pagedep->pd_ino &&
1154 lbn == pagedep->pd_lbn &&
1155 mp == pagedep->pd_list.wk_mp)
1158 *pagedeppp = pagedep;
1159 if ((flags & DEPALLOC) != 0 &&
1160 (pagedep->pd_state & ONWORKLIST) == 0)
1168 * Look up a pagedep. Return 1 if found, 0 if not found or found
1169 * when asked to allocate but not associated with any buffer.
1170 * If not found, allocate if DEPALLOC flag is passed.
1171 * Found or allocated entry is returned in pagedeppp.
1172 * This routine must be called with splbio interrupts blocked.
1175 pagedep_lookup(ip, lbn, flags, pagedeppp)
1179 struct pagedep **pagedeppp;
1181 struct pagedep *pagedep;
1182 struct pagedep_hashhead *pagedephd;
1187 mtx_assert(&lk, MA_OWNED);
1188 mp = ITOV(ip)->v_mount;
1189 pagedephd = PAGEDEP_HASH(mp, ip->i_number, lbn);
1191 ret = pagedep_find(pagedephd, ip->i_number, lbn, mp, flags, pagedeppp);
1192 if (*pagedeppp || (flags & DEPALLOC) == 0)
1195 MALLOC(pagedep, struct pagedep *, sizeof(struct pagedep),
1196 M_PAGEDEP, M_SOFTDEP_FLAGS|M_ZERO);
1197 workitem_alloc(&pagedep->pd_list, D_PAGEDEP, mp);
1199 ret = pagedep_find(pagedephd, ip->i_number, lbn, mp, flags, pagedeppp);
1201 WORKITEM_FREE(pagedep, D_PAGEDEP);
1204 pagedep->pd_ino = ip->i_number;
1205 pagedep->pd_lbn = lbn;
1206 LIST_INIT(&pagedep->pd_dirremhd);
1207 LIST_INIT(&pagedep->pd_pendinghd);
1208 for (i = 0; i < DAHASHSZ; i++)
1209 LIST_INIT(&pagedep->pd_diraddhd[i]);
1210 LIST_INSERT_HEAD(pagedephd, pagedep, pd_hash);
1211 *pagedeppp = pagedep;
1216 * Structures and routines associated with inodedep caching.
1218 LIST_HEAD(inodedep_hashhead, inodedep) *inodedep_hashtbl;
1219 static u_long inodedep_hash; /* size of hash table - 1 */
1220 static long num_inodedep; /* number of inodedep allocated */
1221 #define INODEDEP_HASH(fs, inum) \
1222 (&inodedep_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & inodedep_hash])
1225 inodedep_find(inodedephd, fs, inum, inodedeppp)
1226 struct inodedep_hashhead *inodedephd;
1229 struct inodedep **inodedeppp;
1231 struct inodedep *inodedep;
1233 LIST_FOREACH(inodedep, inodedephd, id_hash)
1234 if (inum == inodedep->id_ino && fs == inodedep->id_fs)
1237 *inodedeppp = inodedep;
1245 * Look up an inodedep. Return 1 if found, 0 if not found.
1246 * If not found, allocate if DEPALLOC flag is passed.
1247 * Found or allocated entry is returned in inodedeppp.
1248 * This routine must be called with splbio interrupts blocked.
1251 inodedep_lookup(mp, inum, flags, inodedeppp)
1255 struct inodedep **inodedeppp;
1257 struct inodedep *inodedep;
1258 struct inodedep_hashhead *inodedephd;
1261 mtx_assert(&lk, MA_OWNED);
1262 fs = VFSTOUFS(mp)->um_fs;
1263 inodedephd = INODEDEP_HASH(fs, inum);
1265 if (inodedep_find(inodedephd, fs, inum, inodedeppp))
1267 if ((flags & DEPALLOC) == 0)
1270 * If we are over our limit, try to improve the situation.
1272 if (num_inodedep > max_softdeps && (flags & NODELAY) == 0)
1273 request_cleanup(mp, FLUSH_INODES);
1275 MALLOC(inodedep, struct inodedep *, sizeof(struct inodedep),
1276 M_INODEDEP, M_SOFTDEP_FLAGS);
1277 workitem_alloc(&inodedep->id_list, D_INODEDEP, mp);
1279 if (inodedep_find(inodedephd, fs, inum, inodedeppp)) {
1280 WORKITEM_FREE(inodedep, D_INODEDEP);
1284 inodedep->id_fs = fs;
1285 inodedep->id_ino = inum;
1286 inodedep->id_state = ALLCOMPLETE;
1287 inodedep->id_nlinkdelta = 0;
1288 inodedep->id_savedino1 = NULL;
1289 inodedep->id_savedsize = -1;
1290 inodedep->id_savedextsize = -1;
1291 inodedep->id_buf = NULL;
1292 LIST_INIT(&inodedep->id_pendinghd);
1293 LIST_INIT(&inodedep->id_inowait);
1294 LIST_INIT(&inodedep->id_bufwait);
1295 TAILQ_INIT(&inodedep->id_inoupdt);
1296 TAILQ_INIT(&inodedep->id_newinoupdt);
1297 TAILQ_INIT(&inodedep->id_extupdt);
1298 TAILQ_INIT(&inodedep->id_newextupdt);
1299 LIST_INSERT_HEAD(inodedephd, inodedep, id_hash);
1300 *inodedeppp = inodedep;
1305 * Structures and routines associated with newblk caching.
1307 LIST_HEAD(newblk_hashhead, newblk) *newblk_hashtbl;
1308 u_long newblk_hash; /* size of hash table - 1 */
1309 #define NEWBLK_HASH(fs, inum) \
1310 (&newblk_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & newblk_hash])
1313 newblk_find(newblkhd, fs, newblkno, newblkpp)
1314 struct newblk_hashhead *newblkhd;
1316 ufs2_daddr_t newblkno;
1317 struct newblk **newblkpp;
1319 struct newblk *newblk;
1321 LIST_FOREACH(newblk, newblkhd, nb_hash)
1322 if (newblkno == newblk->nb_newblkno && fs == newblk->nb_fs)
1333 * Look up a newblk. Return 1 if found, 0 if not found.
1334 * If not found, allocate if DEPALLOC flag is passed.
1335 * Found or allocated entry is returned in newblkpp.
1338 newblk_lookup(fs, newblkno, flags, newblkpp)
1340 ufs2_daddr_t newblkno;
1342 struct newblk **newblkpp;
1344 struct newblk *newblk;
1345 struct newblk_hashhead *newblkhd;
1347 newblkhd = NEWBLK_HASH(fs, newblkno);
1348 if (newblk_find(newblkhd, fs, newblkno, newblkpp))
1350 if ((flags & DEPALLOC) == 0)
1353 MALLOC(newblk, struct newblk *, sizeof(struct newblk),
1354 M_NEWBLK, M_SOFTDEP_FLAGS);
1356 if (newblk_find(newblkhd, fs, newblkno, newblkpp)) {
1357 FREE(newblk, M_NEWBLK);
1360 newblk->nb_state = 0;
1362 newblk->nb_newblkno = newblkno;
1363 LIST_INSERT_HEAD(newblkhd, newblk, nb_hash);
1369 * Executed during filesystem system initialization before
1370 * mounting any filesystems.
1373 softdep_initialize()
1376 LIST_INIT(&mkdirlisthd);
1377 max_softdeps = desiredvnodes * 4;
1378 pagedep_hashtbl = hashinit(desiredvnodes / 5, M_PAGEDEP,
1380 inodedep_hashtbl = hashinit(desiredvnodes, M_INODEDEP, &inodedep_hash);
1381 newblk_hashtbl = hashinit(64, M_NEWBLK, &newblk_hash);
1383 /* initialise bioops hack */
1384 bioops.io_start = softdep_disk_io_initiation;
1385 bioops.io_complete = softdep_disk_write_complete;
1386 bioops.io_deallocate = softdep_deallocate_dependencies;
1387 bioops.io_countdeps = softdep_count_dependencies;
1389 /* Initialize the callout with an mtx. */
1390 callout_init_mtx(&softdep_callout, &lk, 0);
1394 * Executed after all filesystems have been unmounted during
1395 * filesystem module unload.
1398 softdep_uninitialize()
1401 callout_drain(&softdep_callout);
1402 hashdestroy(pagedep_hashtbl, M_PAGEDEP, pagedep_hash);
1403 hashdestroy(inodedep_hashtbl, M_INODEDEP, inodedep_hash);
1404 hashdestroy(newblk_hashtbl, M_NEWBLK, newblk_hash);
1408 * Called at mount time to notify the dependency code that a
1409 * filesystem wishes to use it.
1412 softdep_mount(devvp, mp, fs, cred)
1413 struct vnode *devvp;
1418 struct csum_total cstotal;
1419 struct ufsmount *ump;
1425 mp->mnt_flag = (mp->mnt_flag & ~MNT_ASYNC) | MNT_SOFTDEP;
1426 if ((mp->mnt_kern_flag & MNTK_SOFTDEP) == 0) {
1427 mp->mnt_kern_flag = (mp->mnt_kern_flag & ~MNTK_ASYNC) |
1433 LIST_INIT(&ump->softdep_workitem_pending);
1434 ump->softdep_worklist_tail = NULL;
1435 ump->softdep_on_worklist = 0;
1436 ump->softdep_deps = 0;
1438 * When doing soft updates, the counters in the
1439 * superblock may have gotten out of sync. Recomputation
1440 * can take a long time and can be deferred for background
1441 * fsck. However, the old behavior of scanning the cylinder
1442 * groups and recalculating them at mount time is available
1443 * by setting vfs.ffs.compute_summary_at_mount to one.
1445 if (compute_summary_at_mount == 0 || fs->fs_clean != 0)
1447 bzero(&cstotal, sizeof cstotal);
1448 for (cyl = 0; cyl < fs->fs_ncg; cyl++) {
1449 if ((error = bread(devvp, fsbtodb(fs, cgtod(fs, cyl)),
1450 fs->fs_cgsize, cred, &bp)) != 0) {
1454 cgp = (struct cg *)bp->b_data;
1455 cstotal.cs_nffree += cgp->cg_cs.cs_nffree;
1456 cstotal.cs_nbfree += cgp->cg_cs.cs_nbfree;
1457 cstotal.cs_nifree += cgp->cg_cs.cs_nifree;
1458 cstotal.cs_ndir += cgp->cg_cs.cs_ndir;
1459 fs->fs_cs(fs, cyl) = cgp->cg_cs;
1463 if (bcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal))
1464 printf("%s: superblock summary recomputed\n", fs->fs_fsmnt);
1466 bcopy(&cstotal, &fs->fs_cstotal, sizeof cstotal);
1471 * Protecting the freemaps (or bitmaps).
1473 * To eliminate the need to execute fsck before mounting a filesystem
1474 * after a power failure, one must (conservatively) guarantee that the
1475 * on-disk copy of the bitmaps never indicate that a live inode or block is
1476 * free. So, when a block or inode is allocated, the bitmap should be
1477 * updated (on disk) before any new pointers. When a block or inode is
1478 * freed, the bitmap should not be updated until all pointers have been
1479 * reset. The latter dependency is handled by the delayed de-allocation
1480 * approach described below for block and inode de-allocation. The former
1481 * dependency is handled by calling the following procedure when a block or
1482 * inode is allocated. When an inode is allocated an "inodedep" is created
1483 * with its DEPCOMPLETE flag cleared until its bitmap is written to disk.
1484 * Each "inodedep" is also inserted into the hash indexing structure so
1485 * that any additional link additions can be made dependent on the inode
1488 * The ufs filesystem maintains a number of free block counts (e.g., per
1489 * cylinder group, per cylinder and per <cylinder, rotational position> pair)
1490 * in addition to the bitmaps. These counts are used to improve efficiency
1491 * during allocation and therefore must be consistent with the bitmaps.
1492 * There is no convenient way to guarantee post-crash consistency of these
1493 * counts with simple update ordering, for two main reasons: (1) The counts
1494 * and bitmaps for a single cylinder group block are not in the same disk
1495 * sector. If a disk write is interrupted (e.g., by power failure), one may
1496 * be written and the other not. (2) Some of the counts are located in the
1497 * superblock rather than the cylinder group block. So, we focus our soft
1498 * updates implementation on protecting the bitmaps. When mounting a
1499 * filesystem, we recompute the auxiliary counts from the bitmaps.
1503 * Called just after updating the cylinder group block to allocate an inode.
1506 softdep_setup_inomapdep(bp, ip, newinum)
1507 struct buf *bp; /* buffer for cylgroup block with inode map */
1508 struct inode *ip; /* inode related to allocation */
1509 ino_t newinum; /* new inode number being allocated */
1511 struct inodedep *inodedep;
1512 struct bmsafemap *bmsafemap;
1515 * Create a dependency for the newly allocated inode.
1516 * Panic if it already exists as something is seriously wrong.
1517 * Otherwise add it to the dependency list for the buffer holding
1518 * the cylinder group map from which it was allocated.
1521 if ((inodedep_lookup(UFSTOVFS(ip->i_ump), newinum, DEPALLOC|NODELAY,
1523 panic("softdep_setup_inomapdep: dependency for new inode "
1525 inodedep->id_buf = bp;
1526 inodedep->id_state &= ~DEPCOMPLETE;
1527 bmsafemap = bmsafemap_lookup(inodedep->id_list.wk_mp, bp);
1528 LIST_INSERT_HEAD(&bmsafemap->sm_inodedephd, inodedep, id_deps);
1533 * Called just after updating the cylinder group block to
1534 * allocate block or fragment.
1537 softdep_setup_blkmapdep(bp, mp, newblkno)
1538 struct buf *bp; /* buffer for cylgroup block with block map */
1539 struct mount *mp; /* filesystem doing allocation */
1540 ufs2_daddr_t newblkno; /* number of newly allocated block */
1542 struct newblk *newblk;
1543 struct bmsafemap *bmsafemap;
1546 fs = VFSTOUFS(mp)->um_fs;
1548 * Create a dependency for the newly allocated block.
1549 * Add it to the dependency list for the buffer holding
1550 * the cylinder group map from which it was allocated.
1553 if (newblk_lookup(fs, newblkno, DEPALLOC, &newblk) != 0)
1554 panic("softdep_setup_blkmapdep: found block");
1555 newblk->nb_bmsafemap = bmsafemap = bmsafemap_lookup(mp, bp);
1556 LIST_INSERT_HEAD(&bmsafemap->sm_newblkhd, newblk, nb_deps);
1561 * Find the bmsafemap associated with a cylinder group buffer.
1562 * If none exists, create one. The buffer must be locked when
1563 * this routine is called and this routine must be called with
1564 * splbio interrupts blocked.
1566 static struct bmsafemap *
1567 bmsafemap_lookup(mp, bp)
1571 struct bmsafemap *bmsafemap;
1572 struct worklist *wk;
1574 mtx_assert(&lk, MA_OWNED);
1575 LIST_FOREACH(wk, &bp->b_dep, wk_list)
1576 if (wk->wk_type == D_BMSAFEMAP)
1577 return (WK_BMSAFEMAP(wk));
1579 MALLOC(bmsafemap, struct bmsafemap *, sizeof(struct bmsafemap),
1580 M_BMSAFEMAP, M_SOFTDEP_FLAGS);
1581 workitem_alloc(&bmsafemap->sm_list, D_BMSAFEMAP, mp);
1582 bmsafemap->sm_buf = bp;
1583 LIST_INIT(&bmsafemap->sm_allocdirecthd);
1584 LIST_INIT(&bmsafemap->sm_allocindirhd);
1585 LIST_INIT(&bmsafemap->sm_inodedephd);
1586 LIST_INIT(&bmsafemap->sm_newblkhd);
1588 WORKLIST_INSERT(&bp->b_dep, &bmsafemap->sm_list);
1593 * Direct block allocation dependencies.
1595 * When a new block is allocated, the corresponding disk locations must be
1596 * initialized (with zeros or new data) before the on-disk inode points to
1597 * them. Also, the freemap from which the block was allocated must be
1598 * updated (on disk) before the inode's pointer. These two dependencies are
1599 * independent of each other and are needed for all file blocks and indirect
1600 * blocks that are pointed to directly by the inode. Just before the
1601 * "in-core" version of the inode is updated with a newly allocated block
1602 * number, a procedure (below) is called to setup allocation dependency
1603 * structures. These structures are removed when the corresponding
1604 * dependencies are satisfied or when the block allocation becomes obsolete
1605 * (i.e., the file is deleted, the block is de-allocated, or the block is a
1606 * fragment that gets upgraded). All of these cases are handled in
1607 * procedures described later.
1609 * When a file extension causes a fragment to be upgraded, either to a larger
1610 * fragment or to a full block, the on-disk location may change (if the
1611 * previous fragment could not simply be extended). In this case, the old
1612 * fragment must be de-allocated, but not until after the inode's pointer has
1613 * been updated. In most cases, this is handled by later procedures, which
1614 * will construct a "freefrag" structure to be added to the workitem queue
1615 * when the inode update is complete (or obsolete). The main exception to
1616 * this is when an allocation occurs while a pending allocation dependency
1617 * (for the same block pointer) remains. This case is handled in the main
1618 * allocation dependency setup procedure by immediately freeing the
1619 * unreferenced fragments.
1622 softdep_setup_allocdirect(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
1623 struct inode *ip; /* inode to which block is being added */
1624 ufs_lbn_t lbn; /* block pointer within inode */
1625 ufs2_daddr_t newblkno; /* disk block number being added */
1626 ufs2_daddr_t oldblkno; /* previous block number, 0 unless frag */
1627 long newsize; /* size of new block */
1628 long oldsize; /* size of new block */
1629 struct buf *bp; /* bp for allocated block */
1631 struct allocdirect *adp, *oldadp;
1632 struct allocdirectlst *adphead;
1633 struct bmsafemap *bmsafemap;
1634 struct inodedep *inodedep;
1635 struct pagedep *pagedep;
1636 struct newblk *newblk;
1639 mp = UFSTOVFS(ip->i_ump);
1640 MALLOC(adp, struct allocdirect *, sizeof(struct allocdirect),
1641 M_ALLOCDIRECT, M_SOFTDEP_FLAGS|M_ZERO);
1642 workitem_alloc(&adp->ad_list, D_ALLOCDIRECT, mp);
1644 adp->ad_newblkno = newblkno;
1645 adp->ad_oldblkno = oldblkno;
1646 adp->ad_newsize = newsize;
1647 adp->ad_oldsize = oldsize;
1648 adp->ad_state = ATTACHED;
1649 LIST_INIT(&adp->ad_newdirblk);
1650 if (newblkno == oldblkno)
1651 adp->ad_freefrag = NULL;
1653 adp->ad_freefrag = newfreefrag(ip, oldblkno, oldsize);
1656 if (lbn >= NDADDR) {
1657 /* allocating an indirect block */
1659 panic("softdep_setup_allocdirect: non-zero indir");
1662 * Allocating a direct block.
1664 * If we are allocating a directory block, then we must
1665 * allocate an associated pagedep to track additions and
1668 if ((ip->i_mode & IFMT) == IFDIR &&
1669 pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0)
1670 WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
1672 if (newblk_lookup(ip->i_fs, newblkno, 0, &newblk) == 0)
1673 panic("softdep_setup_allocdirect: lost block");
1674 if (newblk->nb_state == DEPCOMPLETE) {
1675 adp->ad_state |= DEPCOMPLETE;
1678 bmsafemap = newblk->nb_bmsafemap;
1679 adp->ad_buf = bmsafemap->sm_buf;
1680 LIST_REMOVE(newblk, nb_deps);
1681 LIST_INSERT_HEAD(&bmsafemap->sm_allocdirecthd, adp, ad_deps);
1683 LIST_REMOVE(newblk, nb_hash);
1684 FREE(newblk, M_NEWBLK);
1686 inodedep_lookup(mp, ip->i_number, DEPALLOC | NODELAY, &inodedep);
1687 adp->ad_inodedep = inodedep;
1688 WORKLIST_INSERT(&bp->b_dep, &adp->ad_list);
1690 * The list of allocdirects must be kept in sorted and ascending
1691 * order so that the rollback routines can quickly determine the
1692 * first uncommitted block (the size of the file stored on disk
1693 * ends at the end of the lowest committed fragment, or if there
1694 * are no fragments, at the end of the highest committed block).
1695 * Since files generally grow, the typical case is that the new
1696 * block is to be added at the end of the list. We speed this
1697 * special case by checking against the last allocdirect in the
1698 * list before laboriously traversing the list looking for the
1701 adphead = &inodedep->id_newinoupdt;
1702 oldadp = TAILQ_LAST(adphead, allocdirectlst);
1703 if (oldadp == NULL || oldadp->ad_lbn <= lbn) {
1704 /* insert at end of list */
1705 TAILQ_INSERT_TAIL(adphead, adp, ad_next);
1706 if (oldadp != NULL && oldadp->ad_lbn == lbn)
1707 allocdirect_merge(adphead, adp, oldadp);
1711 TAILQ_FOREACH(oldadp, adphead, ad_next) {
1712 if (oldadp->ad_lbn >= lbn)
1716 panic("softdep_setup_allocdirect: lost entry");
1717 /* insert in middle of list */
1718 TAILQ_INSERT_BEFORE(oldadp, adp, ad_next);
1719 if (oldadp->ad_lbn == lbn)
1720 allocdirect_merge(adphead, adp, oldadp);
1725 * Replace an old allocdirect dependency with a newer one.
1726 * This routine must be called with splbio interrupts blocked.
1729 allocdirect_merge(adphead, newadp, oldadp)
1730 struct allocdirectlst *adphead; /* head of list holding allocdirects */
1731 struct allocdirect *newadp; /* allocdirect being added */
1732 struct allocdirect *oldadp; /* existing allocdirect being checked */
1734 struct worklist *wk;
1735 struct freefrag *freefrag;
1736 struct newdirblk *newdirblk;
1738 mtx_assert(&lk, MA_OWNED);
1739 if (newadp->ad_oldblkno != oldadp->ad_newblkno ||
1740 newadp->ad_oldsize != oldadp->ad_newsize ||
1741 newadp->ad_lbn >= NDADDR)
1742 panic("%s %jd != new %jd || old size %ld != new %ld",
1743 "allocdirect_merge: old blkno",
1744 (intmax_t)newadp->ad_oldblkno,
1745 (intmax_t)oldadp->ad_newblkno,
1746 newadp->ad_oldsize, oldadp->ad_newsize);
1747 newadp->ad_oldblkno = oldadp->ad_oldblkno;
1748 newadp->ad_oldsize = oldadp->ad_oldsize;
1750 * If the old dependency had a fragment to free or had never
1751 * previously had a block allocated, then the new dependency
1752 * can immediately post its freefrag and adopt the old freefrag.
1753 * This action is done by swapping the freefrag dependencies.
1754 * The new dependency gains the old one's freefrag, and the
1755 * old one gets the new one and then immediately puts it on
1756 * the worklist when it is freed by free_allocdirect. It is
1757 * not possible to do this swap when the old dependency had a
1758 * non-zero size but no previous fragment to free. This condition
1759 * arises when the new block is an extension of the old block.
1760 * Here, the first part of the fragment allocated to the new
1761 * dependency is part of the block currently claimed on disk by
1762 * the old dependency, so cannot legitimately be freed until the
1763 * conditions for the new dependency are fulfilled.
1765 if (oldadp->ad_freefrag != NULL || oldadp->ad_oldblkno == 0) {
1766 freefrag = newadp->ad_freefrag;
1767 newadp->ad_freefrag = oldadp->ad_freefrag;
1768 oldadp->ad_freefrag = freefrag;
1771 * If we are tracking a new directory-block allocation,
1772 * move it from the old allocdirect to the new allocdirect.
1774 if ((wk = LIST_FIRST(&oldadp->ad_newdirblk)) != NULL) {
1775 newdirblk = WK_NEWDIRBLK(wk);
1776 WORKLIST_REMOVE(&newdirblk->db_list);
1777 if (!LIST_EMPTY(&oldadp->ad_newdirblk))
1778 panic("allocdirect_merge: extra newdirblk");
1779 WORKLIST_INSERT(&newadp->ad_newdirblk, &newdirblk->db_list);
1781 free_allocdirect(adphead, oldadp, 0);
1785 * Allocate a new freefrag structure if needed.
1787 static struct freefrag *
1788 newfreefrag(ip, blkno, size)
1793 struct freefrag *freefrag;
1799 if (fragnum(fs, blkno) + numfrags(fs, size) > fs->fs_frag)
1800 panic("newfreefrag: frag size");
1801 MALLOC(freefrag, struct freefrag *, sizeof(struct freefrag),
1802 M_FREEFRAG, M_SOFTDEP_FLAGS);
1803 workitem_alloc(&freefrag->ff_list, D_FREEFRAG, UFSTOVFS(ip->i_ump));
1804 freefrag->ff_inum = ip->i_number;
1805 freefrag->ff_blkno = blkno;
1806 freefrag->ff_fragsize = size;
1811 * This workitem de-allocates fragments that were replaced during
1812 * file block allocation.
1815 handle_workitem_freefrag(freefrag)
1816 struct freefrag *freefrag;
1818 struct ufsmount *ump = VFSTOUFS(freefrag->ff_list.wk_mp);
1820 ffs_blkfree(ump, ump->um_fs, ump->um_devvp, freefrag->ff_blkno,
1821 freefrag->ff_fragsize, freefrag->ff_inum);
1823 WORKITEM_FREE(freefrag, D_FREEFRAG);
1828 * Set up a dependency structure for an external attributes data block.
1829 * This routine follows much of the structure of softdep_setup_allocdirect.
1830 * See the description of softdep_setup_allocdirect above for details.
1833 softdep_setup_allocext(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp)
1836 ufs2_daddr_t newblkno;
1837 ufs2_daddr_t oldblkno;
1842 struct allocdirect *adp, *oldadp;
1843 struct allocdirectlst *adphead;
1844 struct bmsafemap *bmsafemap;
1845 struct inodedep *inodedep;
1846 struct newblk *newblk;
1849 mp = UFSTOVFS(ip->i_ump);
1850 MALLOC(adp, struct allocdirect *, sizeof(struct allocdirect),
1851 M_ALLOCDIRECT, M_SOFTDEP_FLAGS|M_ZERO);
1852 workitem_alloc(&adp->ad_list, D_ALLOCDIRECT, mp);
1854 adp->ad_newblkno = newblkno;
1855 adp->ad_oldblkno = oldblkno;
1856 adp->ad_newsize = newsize;
1857 adp->ad_oldsize = oldsize;
1858 adp->ad_state = ATTACHED | EXTDATA;
1859 LIST_INIT(&adp->ad_newdirblk);
1860 if (newblkno == oldblkno)
1861 adp->ad_freefrag = NULL;
1863 adp->ad_freefrag = newfreefrag(ip, oldblkno, oldsize);
1866 if (newblk_lookup(ip->i_fs, newblkno, 0, &newblk) == 0)
1867 panic("softdep_setup_allocext: lost block");
1869 inodedep_lookup(mp, ip->i_number, DEPALLOC | NODELAY, &inodedep);
1870 adp->ad_inodedep = inodedep;
1872 if (newblk->nb_state == DEPCOMPLETE) {
1873 adp->ad_state |= DEPCOMPLETE;
1876 bmsafemap = newblk->nb_bmsafemap;
1877 adp->ad_buf = bmsafemap->sm_buf;
1878 LIST_REMOVE(newblk, nb_deps);
1879 LIST_INSERT_HEAD(&bmsafemap->sm_allocdirecthd, adp, ad_deps);
1881 LIST_REMOVE(newblk, nb_hash);
1882 FREE(newblk, M_NEWBLK);
1884 WORKLIST_INSERT(&bp->b_dep, &adp->ad_list);
1886 panic("softdep_setup_allocext: lbn %lld > NXADDR",
1889 * The list of allocdirects must be kept in sorted and ascending
1890 * order so that the rollback routines can quickly determine the
1891 * first uncommitted block (the size of the file stored on disk
1892 * ends at the end of the lowest committed fragment, or if there
1893 * are no fragments, at the end of the highest committed block).
1894 * Since files generally grow, the typical case is that the new
1895 * block is to be added at the end of the list. We speed this
1896 * special case by checking against the last allocdirect in the
1897 * list before laboriously traversing the list looking for the
1900 adphead = &inodedep->id_newextupdt;
1901 oldadp = TAILQ_LAST(adphead, allocdirectlst);
1902 if (oldadp == NULL || oldadp->ad_lbn <= lbn) {
1903 /* insert at end of list */
1904 TAILQ_INSERT_TAIL(adphead, adp, ad_next);
1905 if (oldadp != NULL && oldadp->ad_lbn == lbn)
1906 allocdirect_merge(adphead, adp, oldadp);
1910 TAILQ_FOREACH(oldadp, adphead, ad_next) {
1911 if (oldadp->ad_lbn >= lbn)
1915 panic("softdep_setup_allocext: lost entry");
1916 /* insert in middle of list */
1917 TAILQ_INSERT_BEFORE(oldadp, adp, ad_next);
1918 if (oldadp->ad_lbn == lbn)
1919 allocdirect_merge(adphead, adp, oldadp);
1924 * Indirect block allocation dependencies.
1926 * The same dependencies that exist for a direct block also exist when
1927 * a new block is allocated and pointed to by an entry in a block of
1928 * indirect pointers. The undo/redo states described above are also
1929 * used here. Because an indirect block contains many pointers that
1930 * may have dependencies, a second copy of the entire in-memory indirect
1931 * block is kept. The buffer cache copy is always completely up-to-date.
1932 * The second copy, which is used only as a source for disk writes,
1933 * contains only the safe pointers (i.e., those that have no remaining
1934 * update dependencies). The second copy is freed when all pointers
1935 * are safe. The cache is not allowed to replace indirect blocks with
1936 * pending update dependencies. If a buffer containing an indirect
1937 * block with dependencies is written, these routines will mark it
1938 * dirty again. It can only be successfully written once all the
1939 * dependencies are removed. The ffs_fsync routine in conjunction with
1940 * softdep_sync_metadata work together to get all the dependencies
1941 * removed so that a file can be successfully written to disk. Three
1942 * procedures are used when setting up indirect block pointer
1943 * dependencies. The division is necessary because of the organization
1944 * of the "balloc" routine and because of the distinction between file
1945 * pages and file metadata blocks.
1949 * Allocate a new allocindir structure.
1951 static struct allocindir *
1952 newallocindir(ip, ptrno, newblkno, oldblkno)
1953 struct inode *ip; /* inode for file being extended */
1954 int ptrno; /* offset of pointer in indirect block */
1955 ufs2_daddr_t newblkno; /* disk block number being added */
1956 ufs2_daddr_t oldblkno; /* previous block number, 0 if none */
1958 struct allocindir *aip;
1960 MALLOC(aip, struct allocindir *, sizeof(struct allocindir),
1961 M_ALLOCINDIR, M_SOFTDEP_FLAGS|M_ZERO);
1962 workitem_alloc(&aip->ai_list, D_ALLOCINDIR, UFSTOVFS(ip->i_ump));
1963 aip->ai_state = ATTACHED;
1964 aip->ai_offset = ptrno;
1965 aip->ai_newblkno = newblkno;
1966 aip->ai_oldblkno = oldblkno;
1967 aip->ai_freefrag = newfreefrag(ip, oldblkno, ip->i_fs->fs_bsize);
1972 * Called just before setting an indirect block pointer
1973 * to a newly allocated file page.
1976 softdep_setup_allocindir_page(ip, lbn, bp, ptrno, newblkno, oldblkno, nbp)
1977 struct inode *ip; /* inode for file being extended */
1978 ufs_lbn_t lbn; /* allocated block number within file */
1979 struct buf *bp; /* buffer with indirect blk referencing page */
1980 int ptrno; /* offset of pointer in indirect block */
1981 ufs2_daddr_t newblkno; /* disk block number being added */
1982 ufs2_daddr_t oldblkno; /* previous block number, 0 if none */
1983 struct buf *nbp; /* buffer holding allocated page */
1985 struct allocindir *aip;
1986 struct pagedep *pagedep;
1988 ASSERT_VOP_LOCKED(ITOV(ip), "softdep_setup_allocindir_page");
1989 aip = newallocindir(ip, ptrno, newblkno, oldblkno);
1992 * If we are allocating a directory page, then we must
1993 * allocate an associated pagedep to track additions and
1996 if ((ip->i_mode & IFMT) == IFDIR &&
1997 pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0)
1998 WORKLIST_INSERT(&nbp->b_dep, &pagedep->pd_list);
1999 WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list);
2000 setup_allocindir_phase2(bp, ip, aip);
2005 * Called just before setting an indirect block pointer to a
2006 * newly allocated indirect block.
2009 softdep_setup_allocindir_meta(nbp, ip, bp, ptrno, newblkno)
2010 struct buf *nbp; /* newly allocated indirect block */
2011 struct inode *ip; /* inode for file being extended */
2012 struct buf *bp; /* indirect block referencing allocated block */
2013 int ptrno; /* offset of pointer in indirect block */
2014 ufs2_daddr_t newblkno; /* disk block number being added */
2016 struct allocindir *aip;
2018 ASSERT_VOP_LOCKED(ITOV(ip), "softdep_setup_allocindir_meta");
2019 aip = newallocindir(ip, ptrno, newblkno, 0);
2021 WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list);
2022 setup_allocindir_phase2(bp, ip, aip);
2027 * Called to finish the allocation of the "aip" allocated
2028 * by one of the two routines above.
2031 setup_allocindir_phase2(bp, ip, aip)
2032 struct buf *bp; /* in-memory copy of the indirect block */
2033 struct inode *ip; /* inode for file being extended */
2034 struct allocindir *aip; /* allocindir allocated by the above routines */
2036 struct worklist *wk;
2037 struct indirdep *indirdep, *newindirdep;
2038 struct bmsafemap *bmsafemap;
2039 struct allocindir *oldaip;
2040 struct freefrag *freefrag;
2041 struct newblk *newblk;
2044 mtx_assert(&lk, MA_OWNED);
2045 if (bp->b_lblkno >= 0)
2046 panic("setup_allocindir_phase2: not indir blk");
2047 for (indirdep = NULL, newindirdep = NULL; ; ) {
2048 LIST_FOREACH(wk, &bp->b_dep, wk_list) {
2049 if (wk->wk_type != D_INDIRDEP)
2051 indirdep = WK_INDIRDEP(wk);
2054 if (indirdep == NULL && newindirdep) {
2055 indirdep = newindirdep;
2056 WORKLIST_INSERT(&bp->b_dep, &indirdep->ir_list);
2060 if (newblk_lookup(ip->i_fs, aip->ai_newblkno, 0,
2062 panic("setup_allocindir: lost block");
2063 if (newblk->nb_state == DEPCOMPLETE) {
2064 aip->ai_state |= DEPCOMPLETE;
2067 bmsafemap = newblk->nb_bmsafemap;
2068 aip->ai_buf = bmsafemap->sm_buf;
2069 LIST_REMOVE(newblk, nb_deps);
2070 LIST_INSERT_HEAD(&bmsafemap->sm_allocindirhd,
2073 LIST_REMOVE(newblk, nb_hash);
2074 FREE(newblk, M_NEWBLK);
2075 aip->ai_indirdep = indirdep;
2077 * Check to see if there is an existing dependency
2078 * for this block. If there is, merge the old
2079 * dependency into the new one.
2081 if (aip->ai_oldblkno == 0)
2085 LIST_FOREACH(oldaip, &indirdep->ir_deplisthd, ai_next)
2086 if (oldaip->ai_offset == aip->ai_offset)
2089 if (oldaip != NULL) {
2090 if (oldaip->ai_newblkno != aip->ai_oldblkno)
2091 panic("setup_allocindir_phase2: blkno");
2092 aip->ai_oldblkno = oldaip->ai_oldblkno;
2093 freefrag = aip->ai_freefrag;
2094 aip->ai_freefrag = oldaip->ai_freefrag;
2095 oldaip->ai_freefrag = NULL;
2096 free_allocindir(oldaip, NULL);
2098 LIST_INSERT_HEAD(&indirdep->ir_deplisthd, aip, ai_next);
2099 if (ip->i_ump->um_fstype == UFS1)
2100 ((ufs1_daddr_t *)indirdep->ir_savebp->b_data)
2101 [aip->ai_offset] = aip->ai_oldblkno;
2103 ((ufs2_daddr_t *)indirdep->ir_savebp->b_data)
2104 [aip->ai_offset] = aip->ai_oldblkno;
2106 if (freefrag != NULL)
2107 handle_workitem_freefrag(freefrag);
2111 newindirdep->ir_savebp->b_flags |= B_INVAL | B_NOCACHE;
2112 brelse(newindirdep->ir_savebp);
2114 WORKITEM_FREE((caddr_t)newindirdep, D_INDIRDEP);
2123 MALLOC(newindirdep, struct indirdep *, sizeof(struct indirdep),
2124 M_INDIRDEP, M_SOFTDEP_FLAGS);
2125 workitem_alloc(&newindirdep->ir_list, D_INDIRDEP,
2126 UFSTOVFS(ip->i_ump));
2127 newindirdep->ir_state = ATTACHED;
2128 if (ip->i_ump->um_fstype == UFS1)
2129 newindirdep->ir_state |= UFS1FMT;
2130 LIST_INIT(&newindirdep->ir_deplisthd);
2131 LIST_INIT(&newindirdep->ir_donehd);
2132 if (bp->b_blkno == bp->b_lblkno) {
2133 ufs_bmaparray(bp->b_vp, bp->b_lblkno, &blkno, bp,
2135 bp->b_blkno = blkno;
2137 newindirdep->ir_savebp =
2138 getblk(ip->i_devvp, bp->b_blkno, bp->b_bcount, 0, 0, 0);
2139 BUF_KERNPROC(newindirdep->ir_savebp);
2140 bcopy(bp->b_data, newindirdep->ir_savebp->b_data, bp->b_bcount);
2146 * Block de-allocation dependencies.
2148 * When blocks are de-allocated, the on-disk pointers must be nullified before
2149 * the blocks are made available for use by other files. (The true
2150 * requirement is that old pointers must be nullified before new on-disk
2151 * pointers are set. We chose this slightly more stringent requirement to
2152 * reduce complexity.) Our implementation handles this dependency by updating
2153 * the inode (or indirect block) appropriately but delaying the actual block
2154 * de-allocation (i.e., freemap and free space count manipulation) until
2155 * after the updated versions reach stable storage. After the disk is
2156 * updated, the blocks can be safely de-allocated whenever it is convenient.
2157 * This implementation handles only the common case of reducing a file's
2158 * length to zero. Other cases are handled by the conventional synchronous
2161 * The ffs implementation with which we worked double-checks
2162 * the state of the block pointers and file size as it reduces
2163 * a file's length. Some of this code is replicated here in our
2164 * soft updates implementation. The freeblks->fb_chkcnt field is
2165 * used to transfer a part of this information to the procedure
2166 * that eventually de-allocates the blocks.
2168 * This routine should be called from the routine that shortens
2169 * a file's length, before the inode's size or block pointers
2170 * are modified. It will save the block pointer information for
2171 * later release and zero the inode so that the calling routine
2175 softdep_setup_freeblocks(ip, length, flags)
2176 struct inode *ip; /* The inode whose length is to be reduced */
2177 off_t length; /* The new length for the file */
2178 int flags; /* IO_EXT and/or IO_NORMAL */
2180 struct freeblks *freeblks;
2181 struct inodedep *inodedep;
2182 struct allocdirect *adp;
2187 ufs2_daddr_t extblocks, datablocks;
2189 int i, delay, error;
2192 mp = UFSTOVFS(ip->i_ump);
2194 panic("softdep_setup_freeblocks: non-zero length");
2195 MALLOC(freeblks, struct freeblks *, sizeof(struct freeblks),
2196 M_FREEBLKS, M_SOFTDEP_FLAGS|M_ZERO);
2197 workitem_alloc(&freeblks->fb_list, D_FREEBLKS, mp);
2198 freeblks->fb_state = ATTACHED;
2199 freeblks->fb_uid = ip->i_uid;
2200 freeblks->fb_previousinum = ip->i_number;
2201 freeblks->fb_devvp = ip->i_devvp;
2203 if (fs->fs_magic == FS_UFS2_MAGIC)
2204 extblocks = btodb(fragroundup(fs, ip->i_din2->di_extsize));
2205 datablocks = DIP(ip, i_blocks) - extblocks;
2206 if ((flags & IO_NORMAL) == 0) {
2207 freeblks->fb_oldsize = 0;
2208 freeblks->fb_chkcnt = 0;
2210 freeblks->fb_oldsize = ip->i_size;
2212 DIP_SET(ip, i_size, 0);
2213 freeblks->fb_chkcnt = datablocks;
2214 for (i = 0; i < NDADDR; i++) {
2215 freeblks->fb_dblks[i] = DIP(ip, i_db[i]);
2216 DIP_SET(ip, i_db[i], 0);
2218 for (i = 0; i < NIADDR; i++) {
2219 freeblks->fb_iblks[i] = DIP(ip, i_ib[i]);
2220 DIP_SET(ip, i_ib[i], 0);
2223 * If the file was removed, then the space being freed was
2224 * accounted for then (see softdep_releasefile()). If the
2225 * file is merely being truncated, then we account for it now.
2227 if ((ip->i_flag & IN_SPACECOUNTED) == 0) {
2228 UFS_LOCK(ip->i_ump);
2229 fs->fs_pendingblocks += datablocks;
2230 UFS_UNLOCK(ip->i_ump);
2233 if ((flags & IO_EXT) == 0) {
2234 freeblks->fb_oldextsize = 0;
2236 freeblks->fb_oldextsize = ip->i_din2->di_extsize;
2237 ip->i_din2->di_extsize = 0;
2238 freeblks->fb_chkcnt += extblocks;
2239 for (i = 0; i < NXADDR; i++) {
2240 freeblks->fb_eblks[i] = ip->i_din2->di_extb[i];
2241 ip->i_din2->di_extb[i] = 0;
2244 DIP_SET(ip, i_blocks, DIP(ip, i_blocks) - freeblks->fb_chkcnt);
2246 * Push the zero'ed inode to to its disk buffer so that we are free
2247 * to delete its dependencies below. Once the dependencies are gone
2248 * the buffer can be safely released.
2250 if ((error = bread(ip->i_devvp,
2251 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
2252 (int)fs->fs_bsize, NOCRED, &bp)) != 0) {
2254 softdep_error("softdep_setup_freeblocks", error);
2256 if (ip->i_ump->um_fstype == UFS1)
2257 *((struct ufs1_dinode *)bp->b_data +
2258 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din1;
2260 *((struct ufs2_dinode *)bp->b_data +
2261 ino_to_fsbo(fs, ip->i_number)) = *ip->i_din2;
2263 * Find and eliminate any inode dependencies.
2266 (void) inodedep_lookup(mp, ip->i_number, DEPALLOC, &inodedep);
2267 if ((inodedep->id_state & IOSTARTED) != 0)
2268 panic("softdep_setup_freeblocks: inode busy");
2270 * Add the freeblks structure to the list of operations that
2271 * must await the zero'ed inode being written to disk. If we
2272 * still have a bitmap dependency (delay == 0), then the inode
2273 * has never been written to disk, so we can process the
2274 * freeblks below once we have deleted the dependencies.
2276 delay = (inodedep->id_state & DEPCOMPLETE);
2278 WORKLIST_INSERT(&inodedep->id_bufwait, &freeblks->fb_list);
2280 * Because the file length has been truncated to zero, any
2281 * pending block allocation dependency structures associated
2282 * with this inode are obsolete and can simply be de-allocated.
2283 * We must first merge the two dependency lists to get rid of
2284 * any duplicate freefrag structures, then purge the merged list.
2285 * If we still have a bitmap dependency, then the inode has never
2286 * been written to disk, so we can free any fragments without delay.
2288 if (flags & IO_NORMAL) {
2289 merge_inode_lists(&inodedep->id_newinoupdt,
2290 &inodedep->id_inoupdt);
2291 while ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != 0)
2292 free_allocdirect(&inodedep->id_inoupdt, adp, delay);
2294 if (flags & IO_EXT) {
2295 merge_inode_lists(&inodedep->id_newextupdt,
2296 &inodedep->id_extupdt);
2297 while ((adp = TAILQ_FIRST(&inodedep->id_extupdt)) != 0)
2298 free_allocdirect(&inodedep->id_extupdt, adp, delay);
2303 * We must wait for any I/O in progress to finish so that
2304 * all potential buffers on the dirty list will be visible.
2305 * Once they are all there, walk the list and get rid of
2313 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
2314 if (((flags & IO_EXT) == 0 && (bp->b_xflags & BX_ALTDATA)) ||
2315 ((flags & IO_NORMAL) == 0 &&
2316 (bp->b_xflags & BX_ALTDATA) == 0))
2318 if ((bp = getdirtybuf(bp, BO_MTX(bo), MNT_WAIT)) == NULL)
2322 (void) inodedep_lookup(mp, ip->i_number, 0, &inodedep);
2323 deallocate_dependencies(bp, inodedep);
2325 bp->b_flags |= B_INVAL | B_NOCACHE;
2332 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) != 0)
2333 (void) free_inodedep(inodedep);
2336 freeblks->fb_state |= DEPCOMPLETE;
2338 * If the inode with zeroed block pointers is now on disk
2339 * we can start freeing blocks. Add freeblks to the worklist
2340 * instead of calling handle_workitem_freeblocks directly as
2341 * it is more likely that additional IO is needed to complete
2342 * the request here than in the !delay case.
2344 if ((freeblks->fb_state & ALLCOMPLETE) == ALLCOMPLETE)
2345 add_to_worklist(&freeblks->fb_list);
2350 * If the inode has never been written to disk (delay == 0),
2351 * then we can process the freeblks now that we have deleted
2355 handle_workitem_freeblocks(freeblks, 0);
2359 * Reclaim any dependency structures from a buffer that is about to
2360 * be reallocated to a new vnode. The buffer must be locked, thus,
2361 * no I/O completion operations can occur while we are manipulating
2362 * its associated dependencies. The mutex is held so that other I/O's
2363 * associated with related dependencies do not occur.
2366 deallocate_dependencies(bp, inodedep)
2368 struct inodedep *inodedep;
2370 struct worklist *wk;
2371 struct indirdep *indirdep;
2372 struct allocindir *aip;
2373 struct pagedep *pagedep;
2374 struct dirrem *dirrem;
2378 mtx_assert(&lk, MA_OWNED);
2379 while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) {
2380 switch (wk->wk_type) {
2383 indirdep = WK_INDIRDEP(wk);
2385 * None of the indirect pointers will ever be visible,
2386 * so they can simply be tossed. GOINGAWAY ensures
2387 * that allocated pointers will be saved in the buffer
2388 * cache until they are freed. Note that they will
2389 * only be able to be found by their physical address
2390 * since the inode mapping the logical address will
2391 * be gone. The save buffer used for the safe copy
2392 * was allocated in setup_allocindir_phase2 using
2393 * the physical address so it could be used for this
2394 * purpose. Hence we swap the safe copy with the real
2395 * copy, allowing the safe copy to be freed and holding
2396 * on to the real copy for later use in indir_trunc.
2398 if (indirdep->ir_state & GOINGAWAY)
2399 panic("deallocate_dependencies: already gone");
2400 indirdep->ir_state |= GOINGAWAY;
2401 VFSTOUFS(bp->b_vp->v_mount)->um_numindirdeps += 1;
2402 while ((aip = LIST_FIRST(&indirdep->ir_deplisthd)) != 0)
2403 free_allocindir(aip, inodedep);
2404 if (bp->b_lblkno >= 0 ||
2405 bp->b_blkno != indirdep->ir_savebp->b_lblkno)
2406 panic("deallocate_dependencies: not indir");
2407 bcopy(bp->b_data, indirdep->ir_savebp->b_data,
2409 WORKLIST_REMOVE(wk);
2410 WORKLIST_INSERT(&indirdep->ir_savebp->b_dep, wk);
2414 pagedep = WK_PAGEDEP(wk);
2416 * None of the directory additions will ever be
2417 * visible, so they can simply be tossed.
2419 for (i = 0; i < DAHASHSZ; i++)
2421 LIST_FIRST(&pagedep->pd_diraddhd[i])))
2423 while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != 0)
2426 * Copy any directory remove dependencies to the list
2427 * to be processed after the zero'ed inode is written.
2428 * If the inode has already been written, then they
2429 * can be dumped directly onto the work list.
2431 LIST_FOREACH(dirrem, &pagedep->pd_dirremhd, dm_next) {
2432 LIST_REMOVE(dirrem, dm_next);
2433 dirrem->dm_dirinum = pagedep->pd_ino;
2434 if (inodedep == NULL ||
2435 (inodedep->id_state & ALLCOMPLETE) ==
2437 add_to_worklist(&dirrem->dm_list);
2439 WORKLIST_INSERT(&inodedep->id_bufwait,
2442 if ((pagedep->pd_state & NEWBLOCK) != 0) {
2443 LIST_FOREACH(wk, &inodedep->id_bufwait, wk_list)
2444 if (wk->wk_type == D_NEWDIRBLK &&
2445 WK_NEWDIRBLK(wk)->db_pagedep ==
2449 WORKLIST_REMOVE(wk);
2450 free_newdirblk(WK_NEWDIRBLK(wk));
2452 panic("deallocate_dependencies: "
2455 WORKLIST_REMOVE(&pagedep->pd_list);
2456 LIST_REMOVE(pagedep, pd_hash);
2457 WORKITEM_FREE(pagedep, D_PAGEDEP);
2461 free_allocindir(WK_ALLOCINDIR(wk), inodedep);
2466 panic("deallocate_dependencies: Unexpected type %s",
2467 TYPENAME(wk->wk_type));
2471 panic("deallocate_dependencies: Unknown type %s",
2472 TYPENAME(wk->wk_type));
2479 * Free an allocdirect. Generate a new freefrag work request if appropriate.
2480 * This routine must be called with splbio interrupts blocked.
2483 free_allocdirect(adphead, adp, delay)
2484 struct allocdirectlst *adphead;
2485 struct allocdirect *adp;
2488 struct newdirblk *newdirblk;
2489 struct worklist *wk;
2491 mtx_assert(&lk, MA_OWNED);
2492 if ((adp->ad_state & DEPCOMPLETE) == 0)
2493 LIST_REMOVE(adp, ad_deps);
2494 TAILQ_REMOVE(adphead, adp, ad_next);
2495 if ((adp->ad_state & COMPLETE) == 0)
2496 WORKLIST_REMOVE(&adp->ad_list);
2497 if (adp->ad_freefrag != NULL) {
2499 WORKLIST_INSERT(&adp->ad_inodedep->id_bufwait,
2500 &adp->ad_freefrag->ff_list);
2502 add_to_worklist(&adp->ad_freefrag->ff_list);
2504 if ((wk = LIST_FIRST(&adp->ad_newdirblk)) != NULL) {
2505 newdirblk = WK_NEWDIRBLK(wk);
2506 WORKLIST_REMOVE(&newdirblk->db_list);
2507 if (!LIST_EMPTY(&adp->ad_newdirblk))
2508 panic("free_allocdirect: extra newdirblk");
2510 WORKLIST_INSERT(&adp->ad_inodedep->id_bufwait,
2511 &newdirblk->db_list);
2513 free_newdirblk(newdirblk);
2515 WORKITEM_FREE(adp, D_ALLOCDIRECT);
2519 * Free a newdirblk. Clear the NEWBLOCK flag on its associated pagedep.
2520 * This routine must be called with splbio interrupts blocked.
2523 free_newdirblk(newdirblk)
2524 struct newdirblk *newdirblk;
2526 struct pagedep *pagedep;
2530 mtx_assert(&lk, MA_OWNED);
2532 * If the pagedep is still linked onto the directory buffer
2533 * dependency chain, then some of the entries on the
2534 * pd_pendinghd list may not be committed to disk yet. In
2535 * this case, we will simply clear the NEWBLOCK flag and
2536 * let the pd_pendinghd list be processed when the pagedep
2537 * is next written. If the pagedep is no longer on the buffer
2538 * dependency chain, then all the entries on the pd_pending
2539 * list are committed to disk and we can free them here.
2541 pagedep = newdirblk->db_pagedep;
2542 pagedep->pd_state &= ~NEWBLOCK;
2543 if ((pagedep->pd_state & ONWORKLIST) == 0)
2544 while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != NULL)
2547 * If no dependencies remain, the pagedep will be freed.
2549 for (i = 0; i < DAHASHSZ; i++)
2550 if (!LIST_EMPTY(&pagedep->pd_diraddhd[i]))
2552 if (i == DAHASHSZ && (pagedep->pd_state & ONWORKLIST) == 0) {
2553 LIST_REMOVE(pagedep, pd_hash);
2554 WORKITEM_FREE(pagedep, D_PAGEDEP);
2556 WORKITEM_FREE(newdirblk, D_NEWDIRBLK);
2560 * Prepare an inode to be freed. The actual free operation is not
2561 * done until the zero'ed inode has been written to disk.
2564 softdep_freefile(pvp, ino, mode)
2569 struct inode *ip = VTOI(pvp);
2570 struct inodedep *inodedep;
2571 struct freefile *freefile;
2574 * This sets up the inode de-allocation dependency.
2576 MALLOC(freefile, struct freefile *, sizeof(struct freefile),
2577 M_FREEFILE, M_SOFTDEP_FLAGS);
2578 workitem_alloc(&freefile->fx_list, D_FREEFILE, pvp->v_mount);
2579 freefile->fx_mode = mode;
2580 freefile->fx_oldinum = ino;
2581 freefile->fx_devvp = ip->i_devvp;
2582 if ((ip->i_flag & IN_SPACECOUNTED) == 0) {
2583 UFS_LOCK(ip->i_ump);
2584 ip->i_fs->fs_pendinginodes += 1;
2585 UFS_UNLOCK(ip->i_ump);
2589 * If the inodedep does not exist, then the zero'ed inode has
2590 * been written to disk. If the allocated inode has never been
2591 * written to disk, then the on-disk inode is zero'ed. In either
2592 * case we can free the file immediately.
2595 if (inodedep_lookup(pvp->v_mount, ino, 0, &inodedep) == 0 ||
2596 check_inode_unwritten(inodedep)) {
2598 handle_workitem_freefile(freefile);
2601 WORKLIST_INSERT(&inodedep->id_inowait, &freefile->fx_list);
2603 ip->i_flag |= IN_MODIFIED;
2607 * Check to see if an inode has never been written to disk. If
2608 * so free the inodedep and return success, otherwise return failure.
2609 * This routine must be called with splbio interrupts blocked.
2611 * If we still have a bitmap dependency, then the inode has never
2612 * been written to disk. Drop the dependency as it is no longer
2613 * necessary since the inode is being deallocated. We set the
2614 * ALLCOMPLETE flags since the bitmap now properly shows that the
2615 * inode is not allocated. Even if the inode is actively being
2616 * written, it has been rolled back to its zero'ed state, so we
2617 * are ensured that a zero inode is what is on the disk. For short
2618 * lived files, this change will usually result in removing all the
2619 * dependencies from the inode so that it can be freed immediately.
2622 check_inode_unwritten(inodedep)
2623 struct inodedep *inodedep;
2626 mtx_assert(&lk, MA_OWNED);
2627 if ((inodedep->id_state & DEPCOMPLETE) != 0 ||
2628 !LIST_EMPTY(&inodedep->id_pendinghd) ||
2629 !LIST_EMPTY(&inodedep->id_bufwait) ||
2630 !LIST_EMPTY(&inodedep->id_inowait) ||
2631 !TAILQ_EMPTY(&inodedep->id_inoupdt) ||
2632 !TAILQ_EMPTY(&inodedep->id_newinoupdt) ||
2633 !TAILQ_EMPTY(&inodedep->id_extupdt) ||
2634 !TAILQ_EMPTY(&inodedep->id_newextupdt) ||
2635 inodedep->id_nlinkdelta != 0)
2639 * Another process might be in initiate_write_inodeblock_ufs[12]
2640 * trying to allocate memory without holding "Softdep Lock".
2642 if ((inodedep->id_state & IOSTARTED) != 0 &&
2643 inodedep->id_savedino1 == NULL)
2646 inodedep->id_state |= ALLCOMPLETE;
2647 LIST_REMOVE(inodedep, id_deps);
2648 inodedep->id_buf = NULL;
2649 if (inodedep->id_state & ONWORKLIST)
2650 WORKLIST_REMOVE(&inodedep->id_list);
2651 if (inodedep->id_savedino1 != NULL) {
2652 FREE(inodedep->id_savedino1, M_SAVEDINO);
2653 inodedep->id_savedino1 = NULL;
2655 if (free_inodedep(inodedep) == 0)
2656 panic("check_inode_unwritten: busy inode");
2661 * Try to free an inodedep structure. Return 1 if it could be freed.
2664 free_inodedep(inodedep)
2665 struct inodedep *inodedep;
2668 mtx_assert(&lk, MA_OWNED);
2669 if ((inodedep->id_state & ONWORKLIST) != 0 ||
2670 (inodedep->id_state & ALLCOMPLETE) != ALLCOMPLETE ||
2671 !LIST_EMPTY(&inodedep->id_pendinghd) ||
2672 !LIST_EMPTY(&inodedep->id_bufwait) ||
2673 !LIST_EMPTY(&inodedep->id_inowait) ||
2674 !TAILQ_EMPTY(&inodedep->id_inoupdt) ||
2675 !TAILQ_EMPTY(&inodedep->id_newinoupdt) ||
2676 !TAILQ_EMPTY(&inodedep->id_extupdt) ||
2677 !TAILQ_EMPTY(&inodedep->id_newextupdt) ||
2678 inodedep->id_nlinkdelta != 0 || inodedep->id_savedino1 != NULL)
2680 LIST_REMOVE(inodedep, id_hash);
2681 WORKITEM_FREE(inodedep, D_INODEDEP);
2687 * This workitem routine performs the block de-allocation.
2688 * The workitem is added to the pending list after the updated
2689 * inode block has been written to disk. As mentioned above,
2690 * checks regarding the number of blocks de-allocated (compared
2691 * to the number of blocks allocated for the file) are also
2692 * performed in this function.
2695 handle_workitem_freeblocks(freeblks, flags)
2696 struct freeblks *freeblks;
2702 struct ufsmount *ump;
2703 int i, nblocks, level, bsize;
2704 ufs2_daddr_t bn, blocksreleased = 0;
2705 int error, allerror = 0;
2706 ufs_lbn_t baselbns[NIADDR], tmpval;
2707 int fs_pendingblocks;
2709 ump = VFSTOUFS(freeblks->fb_list.wk_mp);
2711 fs_pendingblocks = 0;
2713 baselbns[0] = NDADDR;
2714 for (i = 1; i < NIADDR; i++) {
2715 tmpval *= NINDIR(fs);
2716 baselbns[i] = baselbns[i - 1] + tmpval;
2718 nblocks = btodb(fs->fs_bsize);
2721 * Release all extended attribute blocks or frags.
2723 if (freeblks->fb_oldextsize > 0) {
2724 for (i = (NXADDR - 1); i >= 0; i--) {
2725 if ((bn = freeblks->fb_eblks[i]) == 0)
2727 bsize = sblksize(fs, freeblks->fb_oldextsize, i);
2728 ffs_blkfree(ump, fs, freeblks->fb_devvp, bn, bsize,
2729 freeblks->fb_previousinum);
2730 blocksreleased += btodb(bsize);
2734 * Release all data blocks or frags.
2736 if (freeblks->fb_oldsize > 0) {
2738 * Indirect blocks first.
2740 for (level = (NIADDR - 1); level >= 0; level--) {
2741 if ((bn = freeblks->fb_iblks[level]) == 0)
2743 if ((error = indir_trunc(freeblks, fsbtodb(fs, bn),
2744 level, baselbns[level], &blocksreleased)) != 0)
2746 ffs_blkfree(ump, fs, freeblks->fb_devvp, bn,
2747 fs->fs_bsize, freeblks->fb_previousinum);
2748 fs_pendingblocks += nblocks;
2749 blocksreleased += nblocks;
2752 * All direct blocks or frags.
2754 for (i = (NDADDR - 1); i >= 0; i--) {
2755 if ((bn = freeblks->fb_dblks[i]) == 0)
2757 bsize = sblksize(fs, freeblks->fb_oldsize, i);
2758 ffs_blkfree(ump, fs, freeblks->fb_devvp, bn, bsize,
2759 freeblks->fb_previousinum);
2760 fs_pendingblocks += btodb(bsize);
2761 blocksreleased += btodb(bsize);
2765 fs->fs_pendingblocks -= fs_pendingblocks;
2768 * If we still have not finished background cleanup, then check
2769 * to see if the block count needs to be adjusted.
2771 if (freeblks->fb_chkcnt != blocksreleased &&
2772 (fs->fs_flags & FS_UNCLEAN) != 0 &&
2773 ffs_vget(freeblks->fb_list.wk_mp, freeblks->fb_previousinum,
2774 (flags & LK_NOWAIT) | LK_EXCLUSIVE, &vp) == 0) {
2776 DIP_SET(ip, i_blocks, DIP(ip, i_blocks) + \
2777 freeblks->fb_chkcnt - blocksreleased);
2778 ip->i_flag |= IN_CHANGE;
2783 if (freeblks->fb_chkcnt != blocksreleased &&
2784 ((fs->fs_flags & FS_UNCLEAN) == 0 || (flags & LK_NOWAIT) != 0))
2785 printf("handle_workitem_freeblocks: block count\n");
2787 softdep_error("handle_workitem_freeblks", allerror);
2788 #endif /* INVARIANTS */
2791 WORKITEM_FREE(freeblks, D_FREEBLKS);
2796 * Release blocks associated with the inode ip and stored in the indirect
2797 * block dbn. If level is greater than SINGLE, the block is an indirect block
2798 * and recursive calls to indirtrunc must be used to cleanse other indirect
2802 indir_trunc(freeblks, dbn, level, lbn, countp)
2803 struct freeblks *freeblks;
2807 ufs2_daddr_t *countp;
2811 struct worklist *wk;
2812 struct indirdep *indirdep;
2813 struct ufsmount *ump;
2814 ufs1_daddr_t *bap1 = 0;
2815 ufs2_daddr_t nb, *bap2 = 0;
2817 int i, nblocks, ufs1fmt;
2818 int error, allerror = 0;
2819 int fs_pendingblocks;
2821 ump = VFSTOUFS(freeblks->fb_list.wk_mp);
2823 fs_pendingblocks = 0;
2825 for (i = level; i > 0; i--)
2826 lbnadd *= NINDIR(fs);
2828 * Get buffer of block pointers to be freed. This routine is not
2829 * called until the zero'ed inode has been written, so it is safe
2830 * to free blocks as they are encountered. Because the inode has
2831 * been zero'ed, calls to bmap on these blocks will fail. So, we
2832 * have to use the on-disk address and the block device for the
2833 * filesystem to look them up. If the file was deleted before its
2834 * indirect blocks were all written to disk, the routine that set
2835 * us up (deallocate_dependencies) will have arranged to leave
2836 * a complete copy of the indirect block in memory for our use.
2837 * Otherwise we have to read the blocks in from the disk.
2840 bp = getblk(freeblks->fb_devvp, dbn, (int)fs->fs_bsize, 0, 0,
2843 bp = incore(&freeblks->fb_devvp->v_bufobj, dbn);
2846 if (bp != NULL && (wk = LIST_FIRST(&bp->b_dep)) != NULL) {
2847 if (wk->wk_type != D_INDIRDEP ||
2848 (indirdep = WK_INDIRDEP(wk))->ir_savebp != bp ||
2849 (indirdep->ir_state & GOINGAWAY) == 0)
2850 panic("indir_trunc: lost indirdep");
2851 WORKLIST_REMOVE(wk);
2852 WORKITEM_FREE(indirdep, D_INDIRDEP);
2853 if (!LIST_EMPTY(&bp->b_dep))
2854 panic("indir_trunc: dangling dep");
2855 ump->um_numindirdeps -= 1;
2863 error = bread(freeblks->fb_devvp, dbn, (int)fs->fs_bsize,
2871 * Recursively free indirect blocks.
2873 if (ump->um_fstype == UFS1) {
2875 bap1 = (ufs1_daddr_t *)bp->b_data;
2878 bap2 = (ufs2_daddr_t *)bp->b_data;
2880 nblocks = btodb(fs->fs_bsize);
2881 for (i = NINDIR(fs) - 1; i >= 0; i--) {
2889 if ((error = indir_trunc(freeblks, fsbtodb(fs, nb),
2890 level - 1, lbn + (i * lbnadd), countp)) != 0)
2893 ffs_blkfree(ump, fs, freeblks->fb_devvp, nb, fs->fs_bsize,
2894 freeblks->fb_previousinum);
2895 fs_pendingblocks += nblocks;
2899 fs->fs_pendingblocks -= fs_pendingblocks;
2901 bp->b_flags |= B_INVAL | B_NOCACHE;
2907 * Free an allocindir.
2908 * This routine must be called with splbio interrupts blocked.
2911 free_allocindir(aip, inodedep)
2912 struct allocindir *aip;
2913 struct inodedep *inodedep;
2915 struct freefrag *freefrag;
2917 mtx_assert(&lk, MA_OWNED);
2918 if ((aip->ai_state & DEPCOMPLETE) == 0)
2919 LIST_REMOVE(aip, ai_deps);
2920 if (aip->ai_state & ONWORKLIST)
2921 WORKLIST_REMOVE(&aip->ai_list);
2922 LIST_REMOVE(aip, ai_next);
2923 if ((freefrag = aip->ai_freefrag) != NULL) {
2924 if (inodedep == NULL)
2925 add_to_worklist(&freefrag->ff_list);
2927 WORKLIST_INSERT(&inodedep->id_bufwait,
2928 &freefrag->ff_list);
2930 WORKITEM_FREE(aip, D_ALLOCINDIR);
2934 * Directory entry addition dependencies.
2936 * When adding a new directory entry, the inode (with its incremented link
2937 * count) must be written to disk before the directory entry's pointer to it.
2938 * Also, if the inode is newly allocated, the corresponding freemap must be
2939 * updated (on disk) before the directory entry's pointer. These requirements
2940 * are met via undo/redo on the directory entry's pointer, which consists
2941 * simply of the inode number.
2943 * As directory entries are added and deleted, the free space within a
2944 * directory block can become fragmented. The ufs filesystem will compact
2945 * a fragmented directory block to make space for a new entry. When this
2946 * occurs, the offsets of previously added entries change. Any "diradd"
2947 * dependency structures corresponding to these entries must be updated with
2952 * This routine is called after the in-memory inode's link
2953 * count has been incremented, but before the directory entry's
2954 * pointer to the inode has been set.
2957 softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp, isnewblk)
2958 struct buf *bp; /* buffer containing directory block */
2959 struct inode *dp; /* inode for directory */
2960 off_t diroffset; /* offset of new entry in directory */
2961 ino_t newinum; /* inode referenced by new directory entry */
2962 struct buf *newdirbp; /* non-NULL => contents of new mkdir */
2963 int isnewblk; /* entry is in a newly allocated block */
2965 int offset; /* offset of new entry within directory block */
2966 ufs_lbn_t lbn; /* block in directory containing new entry */
2969 struct allocdirect *adp;
2970 struct pagedep *pagedep;
2971 struct inodedep *inodedep;
2972 struct newdirblk *newdirblk = 0;
2973 struct mkdir *mkdir1, *mkdir2;
2977 * Whiteouts have no dependencies.
2979 if (newinum == WINO) {
2980 if (newdirbp != NULL)
2984 mp = UFSTOVFS(dp->i_ump);
2986 lbn = lblkno(fs, diroffset);
2987 offset = blkoff(fs, diroffset);
2988 MALLOC(dap, struct diradd *, sizeof(struct diradd), M_DIRADD,
2989 M_SOFTDEP_FLAGS|M_ZERO);
2990 workitem_alloc(&dap->da_list, D_DIRADD, mp);
2991 dap->da_offset = offset;
2992 dap->da_newinum = newinum;
2993 dap->da_state = ATTACHED;
2994 if (isnewblk && lbn < NDADDR && fragoff(fs, diroffset) == 0) {
2995 MALLOC(newdirblk, struct newdirblk *, sizeof(struct newdirblk),
2996 M_NEWDIRBLK, M_SOFTDEP_FLAGS);
2997 workitem_alloc(&newdirblk->db_list, D_NEWDIRBLK, mp);
2999 if (newdirbp == NULL) {
3000 dap->da_state |= DEPCOMPLETE;
3003 dap->da_state |= MKDIR_BODY | MKDIR_PARENT;
3004 MALLOC(mkdir1, struct mkdir *, sizeof(struct mkdir), M_MKDIR,
3006 workitem_alloc(&mkdir1->md_list, D_MKDIR, mp);
3007 mkdir1->md_state = MKDIR_BODY;
3008 mkdir1->md_diradd = dap;
3009 MALLOC(mkdir2, struct mkdir *, sizeof(struct mkdir), M_MKDIR,
3011 workitem_alloc(&mkdir2->md_list, D_MKDIR, mp);
3012 mkdir2->md_state = MKDIR_PARENT;
3013 mkdir2->md_diradd = dap;
3015 * Dependency on "." and ".." being written to disk.
3017 mkdir1->md_buf = newdirbp;
3019 LIST_INSERT_HEAD(&mkdirlisthd, mkdir1, md_mkdirs);
3020 WORKLIST_INSERT(&newdirbp->b_dep, &mkdir1->md_list);
3024 * Dependency on link count increase for parent directory
3027 if (inodedep_lookup(mp, dp->i_number, 0, &inodedep) == 0
3028 || (inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) {
3029 dap->da_state &= ~MKDIR_PARENT;
3030 WORKITEM_FREE(mkdir2, D_MKDIR);
3032 LIST_INSERT_HEAD(&mkdirlisthd, mkdir2, md_mkdirs);
3033 WORKLIST_INSERT(&inodedep->id_bufwait,&mkdir2->md_list);
3037 * Link into parent directory pagedep to await its being written.
3039 if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0)
3040 WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
3041 dap->da_pagedep = pagedep;
3042 LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)], dap,
3045 * Link into its inodedep. Put it on the id_bufwait list if the inode
3046 * is not yet written. If it is written, do the post-inode write
3047 * processing to put it on the id_pendinghd list.
3049 (void) inodedep_lookup(mp, newinum, DEPALLOC, &inodedep);
3050 if ((inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE)
3051 diradd_inode_written(dap, inodedep);
3053 WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list);
3056 * Directories growing into indirect blocks are rare
3057 * enough and the frequency of new block allocation
3058 * in those cases even more rare, that we choose not
3059 * to bother tracking them. Rather we simply force the
3060 * new directory entry to disk.
3062 if (lbn >= NDADDR) {
3065 * We only have a new allocation when at the
3066 * beginning of a new block, not when we are
3067 * expanding into an existing block.
3069 if (blkoff(fs, diroffset) == 0)
3074 * We only have a new allocation when at the beginning
3075 * of a new fragment, not when we are expanding into an
3076 * existing fragment. Also, there is nothing to do if we
3077 * are already tracking this block.
3079 if (fragoff(fs, diroffset) != 0) {
3083 if ((pagedep->pd_state & NEWBLOCK) != 0) {
3084 WORKITEM_FREE(newdirblk, D_NEWDIRBLK);
3089 * Find our associated allocdirect and have it track us.
3091 if (inodedep_lookup(mp, dp->i_number, 0, &inodedep) == 0)
3092 panic("softdep_setup_directory_add: lost inodedep");
3093 adp = TAILQ_LAST(&inodedep->id_newinoupdt, allocdirectlst);
3094 if (adp == NULL || adp->ad_lbn != lbn)
3095 panic("softdep_setup_directory_add: lost entry");
3096 pagedep->pd_state |= NEWBLOCK;
3097 newdirblk->db_pagedep = pagedep;
3098 WORKLIST_INSERT(&adp->ad_newdirblk, &newdirblk->db_list);
3105 * This procedure is called to change the offset of a directory
3106 * entry when compacting a directory block which must be owned
3107 * exclusively by the caller. Note that the actual entry movement
3108 * must be done in this procedure to ensure that no I/O completions
3109 * occur while the move is in progress.
3112 softdep_change_directoryentry_offset(dp, base, oldloc, newloc, entrysize)
3113 struct inode *dp; /* inode for directory */
3114 caddr_t base; /* address of dp->i_offset */
3115 caddr_t oldloc; /* address of old directory location */
3116 caddr_t newloc; /* address of new directory location */
3117 int entrysize; /* size of directory entry */
3119 int offset, oldoffset, newoffset;
3120 struct pagedep *pagedep;
3125 lbn = lblkno(dp->i_fs, dp->i_offset);
3126 offset = blkoff(dp->i_fs, dp->i_offset);
3127 if (pagedep_lookup(dp, lbn, 0, &pagedep) == 0)
3129 oldoffset = offset + (oldloc - base);
3130 newoffset = offset + (newloc - base);
3132 LIST_FOREACH(dap, &pagedep->pd_diraddhd[DIRADDHASH(oldoffset)], da_pdlist) {
3133 if (dap->da_offset != oldoffset)
3135 dap->da_offset = newoffset;
3136 if (DIRADDHASH(newoffset) == DIRADDHASH(oldoffset))
3138 LIST_REMOVE(dap, da_pdlist);
3139 LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(newoffset)],
3145 LIST_FOREACH(dap, &pagedep->pd_pendinghd, da_pdlist) {
3146 if (dap->da_offset == oldoffset) {
3147 dap->da_offset = newoffset;
3153 bcopy(oldloc, newloc, entrysize);
3158 * Free a diradd dependency structure. This routine must be called
3159 * with splbio interrupts blocked.
3165 struct dirrem *dirrem;
3166 struct pagedep *pagedep;
3167 struct inodedep *inodedep;
3168 struct mkdir *mkdir, *nextmd;
3170 mtx_assert(&lk, MA_OWNED);
3171 WORKLIST_REMOVE(&dap->da_list);
3172 LIST_REMOVE(dap, da_pdlist);
3173 if ((dap->da_state & DIRCHG) == 0) {
3174 pagedep = dap->da_pagedep;
3176 dirrem = dap->da_previous;
3177 pagedep = dirrem->dm_pagedep;
3178 dirrem->dm_dirinum = pagedep->pd_ino;
3179 add_to_worklist(&dirrem->dm_list);
3181 if (inodedep_lookup(pagedep->pd_list.wk_mp, dap->da_newinum,
3183 (void) free_inodedep(inodedep);
3184 if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0) {
3185 for (mkdir = LIST_FIRST(&mkdirlisthd); mkdir; mkdir = nextmd) {
3186 nextmd = LIST_NEXT(mkdir, md_mkdirs);
3187 if (mkdir->md_diradd != dap)
3189 dap->da_state &= ~mkdir->md_state;
3190 WORKLIST_REMOVE(&mkdir->md_list);
3191 LIST_REMOVE(mkdir, md_mkdirs);
3192 WORKITEM_FREE(mkdir, D_MKDIR);
3194 if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0)
3195 panic("free_diradd: unfound ref");
3197 WORKITEM_FREE(dap, D_DIRADD);
3201 * Directory entry removal dependencies.
3203 * When removing a directory entry, the entry's inode pointer must be
3204 * zero'ed on disk before the corresponding inode's link count is decremented
3205 * (possibly freeing the inode for re-use). This dependency is handled by
3206 * updating the directory entry but delaying the inode count reduction until
3207 * after the directory block has been written to disk. After this point, the
3208 * inode count can be decremented whenever it is convenient.
3212 * This routine should be called immediately after removing
3213 * a directory entry. The inode's link count should not be
3214 * decremented by the calling procedure -- the soft updates
3215 * code will do this task when it is safe.
3218 softdep_setup_remove(bp, dp, ip, isrmdir)
3219 struct buf *bp; /* buffer containing directory block */
3220 struct inode *dp; /* inode for the directory being modified */
3221 struct inode *ip; /* inode for directory entry being removed */
3222 int isrmdir; /* indicates if doing RMDIR */
3224 struct dirrem *dirrem, *prevdirrem;
3227 * Allocate a new dirrem if appropriate and ACQUIRE_LOCK.
3229 dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem);
3232 * If the COMPLETE flag is clear, then there were no active
3233 * entries and we want to roll back to a zeroed entry until
3234 * the new inode is committed to disk. If the COMPLETE flag is
3235 * set then we have deleted an entry that never made it to
3236 * disk. If the entry we deleted resulted from a name change,
3237 * then the old name still resides on disk. We cannot delete
3238 * its inode (returned to us in prevdirrem) until the zeroed
3239 * directory entry gets to disk. The new inode has never been
3240 * referenced on the disk, so can be deleted immediately.
3242 if ((dirrem->dm_state & COMPLETE) == 0) {
3243 LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd, dirrem,
3247 if (prevdirrem != NULL)
3248 LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd,
3249 prevdirrem, dm_next);
3250 dirrem->dm_dirinum = dirrem->dm_pagedep->pd_ino;
3252 handle_workitem_remove(dirrem, NULL);
3257 * Allocate a new dirrem if appropriate and return it along with
3258 * its associated pagedep. Called without a lock, returns with lock.
3260 static long num_dirrem; /* number of dirrem allocated */
3261 static struct dirrem *
3262 newdirrem(bp, dp, ip, isrmdir, prevdirremp)
3263 struct buf *bp; /* buffer containing directory block */
3264 struct inode *dp; /* inode for the directory being modified */
3265 struct inode *ip; /* inode for directory entry being removed */
3266 int isrmdir; /* indicates if doing RMDIR */
3267 struct dirrem **prevdirremp; /* previously referenced inode, if any */
3272 struct dirrem *dirrem;
3273 struct pagedep *pagedep;
3276 * Whiteouts have no deletion dependencies.
3279 panic("newdirrem: whiteout");
3281 * If we are over our limit, try to improve the situation.
3282 * Limiting the number of dirrem structures will also limit
3283 * the number of freefile and freeblks structures.
3286 if (num_dirrem > max_softdeps / 2)
3287 (void) request_cleanup(ITOV(dp)->v_mount, FLUSH_REMOVE);
3290 MALLOC(dirrem, struct dirrem *, sizeof(struct dirrem),
3291 M_DIRREM, M_SOFTDEP_FLAGS|M_ZERO);
3292 workitem_alloc(&dirrem->dm_list, D_DIRREM, ITOV(dp)->v_mount);
3293 dirrem->dm_state = isrmdir ? RMDIR : 0;
3294 dirrem->dm_oldinum = ip->i_number;
3295 *prevdirremp = NULL;
3298 lbn = lblkno(dp->i_fs, dp->i_offset);
3299 offset = blkoff(dp->i_fs, dp->i_offset);
3300 if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0)
3301 WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list);
3302 dirrem->dm_pagedep = pagedep;
3304 * Check for a diradd dependency for the same directory entry.
3305 * If present, then both dependencies become obsolete and can
3306 * be de-allocated. Check for an entry on both the pd_dirraddhd
3307 * list and the pd_pendinghd list.
3310 LIST_FOREACH(dap, &pagedep->pd_diraddhd[DIRADDHASH(offset)], da_pdlist)
3311 if (dap->da_offset == offset)
3315 LIST_FOREACH(dap, &pagedep->pd_pendinghd, da_pdlist)
3316 if (dap->da_offset == offset)
3322 * Must be ATTACHED at this point.
3324 if ((dap->da_state & ATTACHED) == 0)
3325 panic("newdirrem: not ATTACHED");
3326 if (dap->da_newinum != ip->i_number)
3327 panic("newdirrem: inum %d should be %d",
3328 ip->i_number, dap->da_newinum);
3330 * If we are deleting a changed name that never made it to disk,
3331 * then return the dirrem describing the previous inode (which
3332 * represents the inode currently referenced from this entry on disk).
3334 if ((dap->da_state & DIRCHG) != 0) {
3335 *prevdirremp = dap->da_previous;
3336 dap->da_state &= ~DIRCHG;
3337 dap->da_pagedep = pagedep;
3340 * We are deleting an entry that never made it to disk.
3341 * Mark it COMPLETE so we can delete its inode immediately.
3343 dirrem->dm_state |= COMPLETE;
3349 * Directory entry change dependencies.
3351 * Changing an existing directory entry requires that an add operation
3352 * be completed first followed by a deletion. The semantics for the addition
3353 * are identical to the description of adding a new entry above except
3354 * that the rollback is to the old inode number rather than zero. Once
3355 * the addition dependency is completed, the removal is done as described
3356 * in the removal routine above.
3360 * This routine should be called immediately after changing
3361 * a directory entry. The inode's link count should not be
3362 * decremented by the calling procedure -- the soft updates
3363 * code will perform this task when it is safe.
3366 softdep_setup_directory_change(bp, dp, ip, newinum, isrmdir)
3367 struct buf *bp; /* buffer containing directory block */
3368 struct inode *dp; /* inode for the directory being modified */
3369 struct inode *ip; /* inode for directory entry being removed */
3370 ino_t newinum; /* new inode number for changed entry */
3371 int isrmdir; /* indicates if doing RMDIR */
3374 struct diradd *dap = NULL;
3375 struct dirrem *dirrem, *prevdirrem;
3376 struct pagedep *pagedep;
3377 struct inodedep *inodedep;
3380 offset = blkoff(dp->i_fs, dp->i_offset);
3381 mp = UFSTOVFS(dp->i_ump);
3384 * Whiteouts do not need diradd dependencies.
3386 if (newinum != WINO) {
3387 MALLOC(dap, struct diradd *, sizeof(struct diradd),
3388 M_DIRADD, M_SOFTDEP_FLAGS|M_ZERO);
3389 workitem_alloc(&dap->da_list, D_DIRADD, mp);
3390 dap->da_state = DIRCHG | ATTACHED | DEPCOMPLETE;
3391 dap->da_offset = offset;
3392 dap->da_newinum = newinum;
3396 * Allocate a new dirrem and ACQUIRE_LOCK.
3398 dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem);
3399 pagedep = dirrem->dm_pagedep;
3401 * The possible values for isrmdir:
3402 * 0 - non-directory file rename
3403 * 1 - directory rename within same directory
3404 * inum - directory rename to new directory of given inode number
3405 * When renaming to a new directory, we are both deleting and
3406 * creating a new directory entry, so the link count on the new
3407 * directory should not change. Thus we do not need the followup
3408 * dirrem which is usually done in handle_workitem_remove. We set
3409 * the DIRCHG flag to tell handle_workitem_remove to skip the
3413 dirrem->dm_state |= DIRCHG;
3416 * Whiteouts have no additional dependencies,
3417 * so just put the dirrem on the correct list.
3419 if (newinum == WINO) {
3420 if ((dirrem->dm_state & COMPLETE) == 0) {
3421 LIST_INSERT_HEAD(&pagedep->pd_dirremhd, dirrem,
3424 dirrem->dm_dirinum = pagedep->pd_ino;
3425 add_to_worklist(&dirrem->dm_list);
3432 * If the COMPLETE flag is clear, then there were no active
3433 * entries and we want to roll back to the previous inode until
3434 * the new inode is committed to disk. If the COMPLETE flag is
3435 * set, then we have deleted an entry that never made it to disk.
3436 * If the entry we deleted resulted from a name change, then the old
3437 * inode reference still resides on disk. Any rollback that we do
3438 * needs to be to that old inode (returned to us in prevdirrem). If
3439 * the entry we deleted resulted from a create, then there is
3440 * no entry on the disk, so we want to roll back to zero rather
3441 * than the uncommitted inode. In either of the COMPLETE cases we
3442 * want to immediately free the unwritten and unreferenced inode.
3444 if ((dirrem->dm_state & COMPLETE) == 0) {
3445 dap->da_previous = dirrem;
3447 if (prevdirrem != NULL) {
3448 dap->da_previous = prevdirrem;
3450 dap->da_state &= ~DIRCHG;
3451 dap->da_pagedep = pagedep;
3453 dirrem->dm_dirinum = pagedep->pd_ino;
3454 add_to_worklist(&dirrem->dm_list);
3457 * Link into its inodedep. Put it on the id_bufwait list if the inode
3458 * is not yet written. If it is written, do the post-inode write
3459 * processing to put it on the id_pendinghd list.
3461 if (inodedep_lookup(mp, newinum, DEPALLOC, &inodedep) == 0 ||
3462 (inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) {
3463 dap->da_state |= COMPLETE;
3464 LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
3465 WORKLIST_INSERT(&inodedep->id_pendinghd, &dap->da_list);
3467 LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)],
3469 WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list);
3475 * Called whenever the link count on an inode is changed.
3476 * It creates an inode dependency so that the new reference(s)
3477 * to the inode cannot be committed to disk until the updated
3478 * inode has been written.
3481 softdep_change_linkcnt(ip)
3482 struct inode *ip; /* the inode with the increased link count */
3484 struct inodedep *inodedep;
3487 (void) inodedep_lookup(UFSTOVFS(ip->i_ump), ip->i_number,
3488 DEPALLOC, &inodedep);
3489 if (ip->i_nlink < ip->i_effnlink)
3490 panic("softdep_change_linkcnt: bad delta");
3491 inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
3496 * Called when the effective link count and the reference count
3497 * on an inode drops to zero. At this point there are no names
3498 * referencing the file in the filesystem and no active file
3499 * references. The space associated with the file will be freed
3500 * as soon as the necessary soft dependencies are cleared.
3503 softdep_releasefile(ip)
3504 struct inode *ip; /* inode with the zero effective link count */
3506 struct inodedep *inodedep;
3510 if (ip->i_effnlink > 0)
3511 panic("softdep_releasefile: file still referenced");
3513 * We may be called several times as the on-disk link count
3514 * drops to zero. We only want to account for the space once.
3516 if (ip->i_flag & IN_SPACECOUNTED)
3519 * We have to deactivate a snapshot otherwise copyonwrites may
3520 * add blocks and the cleanup may remove blocks after we have
3521 * tried to account for them.
3523 if ((ip->i_flags & SF_SNAPSHOT) != 0)
3524 ffs_snapremove(ITOV(ip));
3526 * If we are tracking an nlinkdelta, we have to also remember
3527 * whether we accounted for the freed space yet.
3530 if ((inodedep_lookup(UFSTOVFS(ip->i_ump), ip->i_number, 0, &inodedep)))
3531 inodedep->id_state |= SPACECOUNTED;
3535 if (fs->fs_magic == FS_UFS2_MAGIC)
3536 extblocks = btodb(fragroundup(fs, ip->i_din2->di_extsize));
3537 UFS_LOCK(ip->i_ump);
3538 ip->i_fs->fs_pendingblocks += DIP(ip, i_blocks) - extblocks;
3539 ip->i_fs->fs_pendinginodes += 1;
3540 UFS_UNLOCK(ip->i_ump);
3541 ip->i_flag |= IN_SPACECOUNTED;
3545 * This workitem decrements the inode's link count.
3546 * If the link count reaches zero, the file is removed.
3549 handle_workitem_remove(dirrem, xp)
3550 struct dirrem *dirrem;
3553 struct thread *td = curthread;
3554 struct inodedep *inodedep;
3560 if ((vp = xp) == NULL &&
3561 (error = ffs_vget(dirrem->dm_list.wk_mp,
3562 dirrem->dm_oldinum, LK_EXCLUSIVE, &vp)) != 0) {
3563 softdep_error("handle_workitem_remove: vget", error);
3568 if ((inodedep_lookup(dirrem->dm_list.wk_mp,
3569 dirrem->dm_oldinum, 0, &inodedep)) == 0)
3570 panic("handle_workitem_remove: lost inodedep");
3572 * Normal file deletion.
3574 if ((dirrem->dm_state & RMDIR) == 0) {
3576 DIP_SET(ip, i_nlink, ip->i_nlink);
3577 ip->i_flag |= IN_CHANGE;
3578 if (ip->i_nlink < ip->i_effnlink)
3579 panic("handle_workitem_remove: bad file delta");
3580 inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
3582 WORKITEM_FREE(dirrem, D_DIRREM);
3588 * Directory deletion. Decrement reference count for both the
3589 * just deleted parent directory entry and the reference for ".".
3590 * Next truncate the directory to length zero. When the
3591 * truncation completes, arrange to have the reference count on
3592 * the parent decremented to account for the loss of "..".
3595 DIP_SET(ip, i_nlink, ip->i_nlink);
3596 ip->i_flag |= IN_CHANGE;
3597 if (ip->i_nlink < ip->i_effnlink)
3598 panic("handle_workitem_remove: bad dir delta");
3599 inodedep->id_nlinkdelta = ip->i_nlink - ip->i_effnlink;
3601 if ((error = ffs_truncate(vp, (off_t)0, 0, td->td_ucred, td)) != 0)
3602 softdep_error("handle_workitem_remove: truncate", error);
3605 * Rename a directory to a new parent. Since, we are both deleting
3606 * and creating a new directory entry, the link count on the new
3607 * directory should not change. Thus we skip the followup dirrem.
3609 if (dirrem->dm_state & DIRCHG) {
3611 WORKITEM_FREE(dirrem, D_DIRREM);
3617 * If the inodedep does not exist, then the zero'ed inode has
3618 * been written to disk. If the allocated inode has never been
3619 * written to disk, then the on-disk inode is zero'ed. In either
3620 * case we can remove the file immediately.
3622 dirrem->dm_state = 0;
3623 oldinum = dirrem->dm_oldinum;
3624 dirrem->dm_oldinum = dirrem->dm_dirinum;
3625 if (inodedep_lookup(dirrem->dm_list.wk_mp, oldinum,
3626 0, &inodedep) == 0 || check_inode_unwritten(inodedep)) {
3628 add_to_worklist(&dirrem->dm_list);
3632 handle_workitem_remove(dirrem, NULL);
3635 WORKLIST_INSERT(&inodedep->id_inowait, &dirrem->dm_list);
3637 ip->i_flag |= IN_CHANGE;
3643 * Inode de-allocation dependencies.
3645 * When an inode's link count is reduced to zero, it can be de-allocated. We
3646 * found it convenient to postpone de-allocation until after the inode is
3647 * written to disk with its new link count (zero). At this point, all of the
3648 * on-disk inode's block pointers are nullified and, with careful dependency
3649 * list ordering, all dependencies related to the inode will be satisfied and
3650 * the corresponding dependency structures de-allocated. So, if/when the
3651 * inode is reused, there will be no mixing of old dependencies with new
3652 * ones. This artificial dependency is set up by the block de-allocation
3653 * procedure above (softdep_setup_freeblocks) and completed by the
3654 * following procedure.
3657 handle_workitem_freefile(freefile)
3658 struct freefile *freefile;
3661 struct inodedep *idp;
3662 struct ufsmount *ump;
3665 ump = VFSTOUFS(freefile->fx_list.wk_mp);
3669 error = inodedep_lookup(UFSTOVFS(ump), freefile->fx_oldinum, 0, &idp);
3672 panic("handle_workitem_freefile: inodedep survived");
3675 fs->fs_pendinginodes -= 1;
3677 if ((error = ffs_freefile(ump, fs, freefile->fx_devvp,
3678 freefile->fx_oldinum, freefile->fx_mode)) != 0)
3679 softdep_error("handle_workitem_freefile", error);
3681 WORKITEM_FREE(freefile, D_FREEFILE);
3687 * Helper function which unlinks marker element from work list and returns
3688 * the next element on the list.
3690 static __inline struct worklist *
3691 markernext(struct worklist *marker)
3693 struct worklist *next;
3695 next = LIST_NEXT(marker, wk_list);
3696 LIST_REMOVE(marker, wk_list);
3703 * The dependency structures constructed above are most actively used when file
3704 * system blocks are written to disk. No constraints are placed on when a
3705 * block can be written, but unsatisfied update dependencies are made safe by
3706 * modifying (or replacing) the source memory for the duration of the disk
3707 * write. When the disk write completes, the memory block is again brought
3710 * In-core inode structure reclamation.
3712 * Because there are a finite number of "in-core" inode structures, they are
3713 * reused regularly. By transferring all inode-related dependencies to the
3714 * in-memory inode block and indexing them separately (via "inodedep"s), we
3715 * can allow "in-core" inode structures to be reused at any time and avoid
3716 * any increase in contention.
3718 * Called just before entering the device driver to initiate a new disk I/O.
3719 * The buffer must be locked, thus, no I/O completion operations can occur
3720 * while we are manipulating its associated dependencies.
3723 softdep_disk_io_initiation(bp)
3724 struct buf *bp; /* structure describing disk write to occur */
3726 struct worklist *wk;
3727 struct worklist marker;
3728 struct indirdep *indirdep;
3729 struct inodedep *inodedep;
3732 * We only care about write operations. There should never
3733 * be dependencies for reads.
3735 if (bp->b_iocmd != BIO_WRITE)
3736 panic("softdep_disk_io_initiation: not write");
3738 marker.wk_type = D_LAST + 1; /* Not a normal workitem */
3739 PHOLD(curproc); /* Don't swap out kernel stack */
3743 * Do any necessary pre-I/O processing.
3745 for (wk = LIST_FIRST(&bp->b_dep); wk != NULL;
3746 wk = markernext(&marker)) {
3747 LIST_INSERT_AFTER(wk, &marker, wk_list);
3748 switch (wk->wk_type) {
3751 initiate_write_filepage(WK_PAGEDEP(wk), bp);
3755 inodedep = WK_INODEDEP(wk);
3756 if (inodedep->id_fs->fs_magic == FS_UFS1_MAGIC)
3757 initiate_write_inodeblock_ufs1(inodedep, bp);
3759 initiate_write_inodeblock_ufs2(inodedep, bp);
3763 indirdep = WK_INDIRDEP(wk);
3764 if (indirdep->ir_state & GOINGAWAY)
3765 panic("disk_io_initiation: indirdep gone");
3767 * If there are no remaining dependencies, this
3768 * will be writing the real pointers, so the
3769 * dependency can be freed.
3771 if (LIST_EMPTY(&indirdep->ir_deplisthd)) {
3774 bp = indirdep->ir_savebp;
3775 bp->b_flags |= B_INVAL | B_NOCACHE;
3776 /* inline expand WORKLIST_REMOVE(wk); */
3777 wk->wk_state &= ~ONWORKLIST;
3778 LIST_REMOVE(wk, wk_list);
3779 WORKITEM_FREE(indirdep, D_INDIRDEP);
3786 * Replace up-to-date version with safe version.
3789 MALLOC(indirdep->ir_saveddata, caddr_t, bp->b_bcount,
3790 M_INDIRDEP, M_SOFTDEP_FLAGS);
3792 indirdep->ir_state &= ~ATTACHED;
3793 indirdep->ir_state |= UNDONE;
3794 bcopy(bp->b_data, indirdep->ir_saveddata, bp->b_bcount);
3795 bcopy(indirdep->ir_savebp->b_data, bp->b_data,
3806 panic("handle_disk_io_initiation: Unexpected type %s",
3807 TYPENAME(wk->wk_type));
3812 PRELE(curproc); /* Allow swapout of kernel stack */
3816 * Called from within the procedure above to deal with unsatisfied
3817 * allocation dependencies in a directory. The buffer must be locked,
3818 * thus, no I/O completion operations can occur while we are
3819 * manipulating its associated dependencies.
3822 initiate_write_filepage(pagedep, bp)
3823 struct pagedep *pagedep;
3830 if (pagedep->pd_state & IOSTARTED) {
3832 * This can only happen if there is a driver that does not
3833 * understand chaining. Here biodone will reissue the call
3834 * to strategy for the incomplete buffers.
3836 printf("initiate_write_filepage: already started\n");
3839 pagedep->pd_state |= IOSTARTED;
3840 for (i = 0; i < DAHASHSZ; i++) {
3841 LIST_FOREACH(dap, &pagedep->pd_diraddhd[i], da_pdlist) {
3842 ep = (struct direct *)
3843 ((char *)bp->b_data + dap->da_offset);
3844 if (ep->d_ino != dap->da_newinum)
3845 panic("%s: dir inum %d != new %d",
3846 "initiate_write_filepage",
3847 ep->d_ino, dap->da_newinum);
3848 if (dap->da_state & DIRCHG)
3849 ep->d_ino = dap->da_previous->dm_oldinum;
3852 dap->da_state &= ~ATTACHED;
3853 dap->da_state |= UNDONE;
3859 * Version of initiate_write_inodeblock that handles UFS1 dinodes.
3860 * Note that any bug fixes made to this routine must be done in the
3861 * version found below.
3863 * Called from within the procedure above to deal with unsatisfied
3864 * allocation dependencies in an inodeblock. The buffer must be
3865 * locked, thus, no I/O completion operations can occur while we
3866 * are manipulating its associated dependencies.
3869 initiate_write_inodeblock_ufs1(inodedep, bp)
3870 struct inodedep *inodedep;
3871 struct buf *bp; /* The inode block */
3873 struct allocdirect *adp, *lastadp;
3874 struct ufs1_dinode *dp;
3875 struct ufs1_dinode *sip;
3879 ufs_lbn_t prevlbn = 0;
3883 if (inodedep->id_state & IOSTARTED)
3884 panic("initiate_write_inodeblock_ufs1: already started");
3885 inodedep->id_state |= IOSTARTED;
3886 fs = inodedep->id_fs;
3887 dp = (struct ufs1_dinode *)bp->b_data +
3888 ino_to_fsbo(fs, inodedep->id_ino);
3890 * If the bitmap is not yet written, then the allocated
3891 * inode cannot be written to disk.
3893 if ((inodedep->id_state & DEPCOMPLETE) == 0) {
3894 if (inodedep->id_savedino1 != NULL)
3895 panic("initiate_write_inodeblock_ufs1: I/O underway");
3897 MALLOC(sip, struct ufs1_dinode *,
3898 sizeof(struct ufs1_dinode), M_SAVEDINO, M_SOFTDEP_FLAGS);
3900 inodedep->id_savedino1 = sip;
3901 *inodedep->id_savedino1 = *dp;
3902 bzero((caddr_t)dp, sizeof(struct ufs1_dinode));
3903 dp->di_gen = inodedep->id_savedino1->di_gen;
3907 * If no dependencies, then there is nothing to roll back.
3909 inodedep->id_savedsize = dp->di_size;
3910 inodedep->id_savedextsize = 0;
3911 if (TAILQ_EMPTY(&inodedep->id_inoupdt))
3914 * Set the dependencies to busy.
3916 for (deplist = 0, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
3917 adp = TAILQ_NEXT(adp, ad_next)) {
3919 if (deplist != 0 && prevlbn >= adp->ad_lbn)
3920 panic("softdep_write_inodeblock: lbn order");
3921 prevlbn = adp->ad_lbn;
3922 if (adp->ad_lbn < NDADDR &&
3923 dp->di_db[adp->ad_lbn] != adp->ad_newblkno)
3924 panic("%s: direct pointer #%jd mismatch %d != %jd",
3925 "softdep_write_inodeblock",
3926 (intmax_t)adp->ad_lbn,
3927 dp->di_db[adp->ad_lbn],
3928 (intmax_t)adp->ad_newblkno);
3929 if (adp->ad_lbn >= NDADDR &&
3930 dp->di_ib[adp->ad_lbn - NDADDR] != adp->ad_newblkno)
3931 panic("%s: indirect pointer #%jd mismatch %d != %jd",
3932 "softdep_write_inodeblock",
3933 (intmax_t)adp->ad_lbn - NDADDR,
3934 dp->di_ib[adp->ad_lbn - NDADDR],
3935 (intmax_t)adp->ad_newblkno);
3936 deplist |= 1 << adp->ad_lbn;
3937 if ((adp->ad_state & ATTACHED) == 0)
3938 panic("softdep_write_inodeblock: Unknown state 0x%x",
3940 #endif /* INVARIANTS */
3941 adp->ad_state &= ~ATTACHED;
3942 adp->ad_state |= UNDONE;
3945 * The on-disk inode cannot claim to be any larger than the last
3946 * fragment that has been written. Otherwise, the on-disk inode
3947 * might have fragments that were not the last block in the file
3948 * which would corrupt the filesystem.
3950 for (lastadp = NULL, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
3951 lastadp = adp, adp = TAILQ_NEXT(adp, ad_next)) {
3952 if (adp->ad_lbn >= NDADDR)
3954 dp->di_db[adp->ad_lbn] = adp->ad_oldblkno;
3955 /* keep going until hitting a rollback to a frag */
3956 if (adp->ad_oldsize == 0 || adp->ad_oldsize == fs->fs_bsize)
3958 dp->di_size = fs->fs_bsize * adp->ad_lbn + adp->ad_oldsize;
3959 for (i = adp->ad_lbn + 1; i < NDADDR; i++) {
3961 if (dp->di_db[i] != 0 && (deplist & (1 << i)) == 0)
3962 panic("softdep_write_inodeblock: lost dep1");
3963 #endif /* INVARIANTS */
3966 for (i = 0; i < NIADDR; i++) {
3968 if (dp->di_ib[i] != 0 &&
3969 (deplist & ((1 << NDADDR) << i)) == 0)
3970 panic("softdep_write_inodeblock: lost dep2");
3971 #endif /* INVARIANTS */
3977 * If we have zero'ed out the last allocated block of the file,
3978 * roll back the size to the last currently allocated block.
3979 * We know that this last allocated block is a full-sized as
3980 * we already checked for fragments in the loop above.
3982 if (lastadp != NULL &&
3983 dp->di_size <= (lastadp->ad_lbn + 1) * fs->fs_bsize) {
3984 for (i = lastadp->ad_lbn; i >= 0; i--)
3985 if (dp->di_db[i] != 0)
3987 dp->di_size = (i + 1) * fs->fs_bsize;
3990 * The only dependencies are for indirect blocks.
3992 * The file size for indirect block additions is not guaranteed.
3993 * Such a guarantee would be non-trivial to achieve. The conventional
3994 * synchronous write implementation also does not make this guarantee.
3995 * Fsck should catch and fix discrepancies. Arguably, the file size
3996 * can be over-estimated without destroying integrity when the file
3997 * moves into the indirect blocks (i.e., is large). If we want to
3998 * postpone fsck, we are stuck with this argument.
4000 for (; adp; adp = TAILQ_NEXT(adp, ad_next))
4001 dp->di_ib[adp->ad_lbn - NDADDR] = 0;
4005 * Version of initiate_write_inodeblock that handles UFS2 dinodes.
4006 * Note that any bug fixes made to this routine must be done in the
4007 * version found above.
4009 * Called from within the procedure above to deal with unsatisfied
4010 * allocation dependencies in an inodeblock. The buffer must be
4011 * locked, thus, no I/O completion operations can occur while we
4012 * are manipulating its associated dependencies.
4015 initiate_write_inodeblock_ufs2(inodedep, bp)
4016 struct inodedep *inodedep;
4017 struct buf *bp; /* The inode block */
4019 struct allocdirect *adp, *lastadp;
4020 struct ufs2_dinode *dp;
4021 struct ufs2_dinode *sip;
4025 ufs_lbn_t prevlbn = 0;
4029 if (inodedep->id_state & IOSTARTED)
4030 panic("initiate_write_inodeblock_ufs2: already started");
4031 inodedep->id_state |= IOSTARTED;
4032 fs = inodedep->id_fs;
4033 dp = (struct ufs2_dinode *)bp->b_data +
4034 ino_to_fsbo(fs, inodedep->id_ino);
4036 * If the bitmap is not yet written, then the allocated
4037 * inode cannot be written to disk.
4039 if ((inodedep->id_state & DEPCOMPLETE) == 0) {
4040 if (inodedep->id_savedino2 != NULL)
4041 panic("initiate_write_inodeblock_ufs2: I/O underway");
4043 MALLOC(sip, struct ufs2_dinode *,
4044 sizeof(struct ufs2_dinode), M_SAVEDINO, M_SOFTDEP_FLAGS);
4046 inodedep->id_savedino2 = sip;
4047 *inodedep->id_savedino2 = *dp;
4048 bzero((caddr_t)dp, sizeof(struct ufs2_dinode));
4049 dp->di_gen = inodedep->id_savedino2->di_gen;
4053 * If no dependencies, then there is nothing to roll back.
4055 inodedep->id_savedsize = dp->di_size;
4056 inodedep->id_savedextsize = dp->di_extsize;
4057 if (TAILQ_EMPTY(&inodedep->id_inoupdt) &&
4058 TAILQ_EMPTY(&inodedep->id_extupdt))
4061 * Set the ext data dependencies to busy.
4063 for (deplist = 0, adp = TAILQ_FIRST(&inodedep->id_extupdt); adp;
4064 adp = TAILQ_NEXT(adp, ad_next)) {
4066 if (deplist != 0 && prevlbn >= adp->ad_lbn)
4067 panic("softdep_write_inodeblock: lbn order");
4068 prevlbn = adp->ad_lbn;
4069 if (dp->di_extb[adp->ad_lbn] != adp->ad_newblkno)
4070 panic("%s: direct pointer #%jd mismatch %jd != %jd",
4071 "softdep_write_inodeblock",
4072 (intmax_t)adp->ad_lbn,
4073 (intmax_t)dp->di_extb[adp->ad_lbn],
4074 (intmax_t)adp->ad_newblkno);
4075 deplist |= 1 << adp->ad_lbn;
4076 if ((adp->ad_state & ATTACHED) == 0)
4077 panic("softdep_write_inodeblock: Unknown state 0x%x",
4079 #endif /* INVARIANTS */
4080 adp->ad_state &= ~ATTACHED;
4081 adp->ad_state |= UNDONE;
4084 * The on-disk inode cannot claim to be any larger than the last
4085 * fragment that has been written. Otherwise, the on-disk inode
4086 * might have fragments that were not the last block in the ext
4087 * data which would corrupt the filesystem.
4089 for (lastadp = NULL, adp = TAILQ_FIRST(&inodedep->id_extupdt); adp;
4090 lastadp = adp, adp = TAILQ_NEXT(adp, ad_next)) {
4091 dp->di_extb[adp->ad_lbn] = adp->ad_oldblkno;
4092 /* keep going until hitting a rollback to a frag */
4093 if (adp->ad_oldsize == 0 || adp->ad_oldsize == fs->fs_bsize)
4095 dp->di_extsize = fs->fs_bsize * adp->ad_lbn + adp->ad_oldsize;
4096 for (i = adp->ad_lbn + 1; i < NXADDR; i++) {
4098 if (dp->di_extb[i] != 0 && (deplist & (1 << i)) == 0)
4099 panic("softdep_write_inodeblock: lost dep1");
4100 #endif /* INVARIANTS */
4107 * If we have zero'ed out the last allocated block of the ext
4108 * data, roll back the size to the last currently allocated block.
4109 * We know that this last allocated block is a full-sized as
4110 * we already checked for fragments in the loop above.
4112 if (lastadp != NULL &&
4113 dp->di_extsize <= (lastadp->ad_lbn + 1) * fs->fs_bsize) {
4114 for (i = lastadp->ad_lbn; i >= 0; i--)
4115 if (dp->di_extb[i] != 0)
4117 dp->di_extsize = (i + 1) * fs->fs_bsize;
4120 * Set the file data dependencies to busy.
4122 for (deplist = 0, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
4123 adp = TAILQ_NEXT(adp, ad_next)) {
4125 if (deplist != 0 && prevlbn >= adp->ad_lbn)
4126 panic("softdep_write_inodeblock: lbn order");
4127 prevlbn = adp->ad_lbn;
4128 if (adp->ad_lbn < NDADDR &&
4129 dp->di_db[adp->ad_lbn] != adp->ad_newblkno)
4130 panic("%s: direct pointer #%jd mismatch %jd != %jd",
4131 "softdep_write_inodeblock",
4132 (intmax_t)adp->ad_lbn,
4133 (intmax_t)dp->di_db[adp->ad_lbn],
4134 (intmax_t)adp->ad_newblkno);
4135 if (adp->ad_lbn >= NDADDR &&
4136 dp->di_ib[adp->ad_lbn - NDADDR] != adp->ad_newblkno)
4137 panic("%s indirect pointer #%jd mismatch %jd != %jd",
4138 "softdep_write_inodeblock:",
4139 (intmax_t)adp->ad_lbn - NDADDR,
4140 (intmax_t)dp->di_ib[adp->ad_lbn - NDADDR],
4141 (intmax_t)adp->ad_newblkno);
4142 deplist |= 1 << adp->ad_lbn;
4143 if ((adp->ad_state & ATTACHED) == 0)
4144 panic("softdep_write_inodeblock: Unknown state 0x%x",
4146 #endif /* INVARIANTS */
4147 adp->ad_state &= ~ATTACHED;
4148 adp->ad_state |= UNDONE;
4151 * The on-disk inode cannot claim to be any larger than the last
4152 * fragment that has been written. Otherwise, the on-disk inode
4153 * might have fragments that were not the last block in the file
4154 * which would corrupt the filesystem.
4156 for (lastadp = NULL, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp;
4157 lastadp = adp, adp = TAILQ_NEXT(adp, ad_next)) {
4158 if (adp->ad_lbn >= NDADDR)
4160 dp->di_db[adp->ad_lbn] = adp->ad_oldblkno;
4161 /* keep going until hitting a rollback to a frag */
4162 if (adp->ad_oldsize == 0 || adp->ad_oldsize == fs->fs_bsize)
4164 dp->di_size = fs->fs_bsize * adp->ad_lbn + adp->ad_oldsize;
4165 for (i = adp->ad_lbn + 1; i < NDADDR; i++) {
4167 if (dp->di_db[i] != 0 && (deplist & (1 << i)) == 0)
4168 panic("softdep_write_inodeblock: lost dep2");
4169 #endif /* INVARIANTS */
4172 for (i = 0; i < NIADDR; i++) {
4174 if (dp->di_ib[i] != 0 &&
4175 (deplist & ((1 << NDADDR) << i)) == 0)
4176 panic("softdep_write_inodeblock: lost dep3");
4177 #endif /* INVARIANTS */
4183 * If we have zero'ed out the last allocated block of the file,
4184 * roll back the size to the last currently allocated block.
4185 * We know that this last allocated block is a full-sized as
4186 * we already checked for fragments in the loop above.
4188 if (lastadp != NULL &&
4189 dp->di_size <= (lastadp->ad_lbn + 1) * fs->fs_bsize) {
4190 for (i = lastadp->ad_lbn; i >= 0; i--)
4191 if (dp->di_db[i] != 0)
4193 dp->di_size = (i + 1) * fs->fs_bsize;
4196 * The only dependencies are for indirect blocks.
4198 * The file size for indirect block additions is not guaranteed.
4199 * Such a guarantee would be non-trivial to achieve. The conventional
4200 * synchronous write implementation also does not make this guarantee.
4201 * Fsck should catch and fix discrepancies. Arguably, the file size
4202 * can be over-estimated without destroying integrity when the file
4203 * moves into the indirect blocks (i.e., is large). If we want to
4204 * postpone fsck, we are stuck with this argument.
4206 for (; adp; adp = TAILQ_NEXT(adp, ad_next))
4207 dp->di_ib[adp->ad_lbn - NDADDR] = 0;
4211 * This routine is called during the completion interrupt
4212 * service routine for a disk write (from the procedure called
4213 * by the device driver to inform the filesystem caches of
4214 * a request completion). It should be called early in this
4215 * procedure, before the block is made available to other
4216 * processes or other routines are called.
4219 softdep_disk_write_complete(bp)
4220 struct buf *bp; /* describes the completed disk write */
4222 struct worklist *wk;
4223 struct worklist *owk;
4224 struct workhead reattach;
4225 struct newblk *newblk;
4226 struct allocindir *aip;
4227 struct allocdirect *adp;
4228 struct indirdep *indirdep;
4229 struct inodedep *inodedep;
4230 struct bmsafemap *bmsafemap;
4233 * If an error occurred while doing the write, then the data
4234 * has not hit the disk and the dependencies cannot be unrolled.
4236 if ((bp->b_ioflags & BIO_ERROR) != 0 && (bp->b_flags & B_INVAL) == 0)
4238 LIST_INIT(&reattach);
4240 * This lock must not be released anywhere in this code segment.
4244 while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) {
4245 WORKLIST_REMOVE(wk);
4247 panic("duplicate worklist: %p\n", wk);
4249 switch (wk->wk_type) {
4252 if (handle_written_filepage(WK_PAGEDEP(wk), bp))
4253 WORKLIST_INSERT(&reattach, wk);
4257 if (handle_written_inodeblock(WK_INODEDEP(wk), bp))
4258 WORKLIST_INSERT(&reattach, wk);
4262 bmsafemap = WK_BMSAFEMAP(wk);
4263 while ((newblk = LIST_FIRST(&bmsafemap->sm_newblkhd))) {
4264 newblk->nb_state |= DEPCOMPLETE;
4265 newblk->nb_bmsafemap = NULL;
4266 LIST_REMOVE(newblk, nb_deps);
4269 LIST_FIRST(&bmsafemap->sm_allocdirecthd))) {
4270 adp->ad_state |= DEPCOMPLETE;
4272 LIST_REMOVE(adp, ad_deps);
4273 handle_allocdirect_partdone(adp);
4276 LIST_FIRST(&bmsafemap->sm_allocindirhd))) {
4277 aip->ai_state |= DEPCOMPLETE;
4279 LIST_REMOVE(aip, ai_deps);
4280 handle_allocindir_partdone(aip);
4283 LIST_FIRST(&bmsafemap->sm_inodedephd)) != NULL) {
4284 inodedep->id_state |= DEPCOMPLETE;
4285 LIST_REMOVE(inodedep, id_deps);
4286 inodedep->id_buf = NULL;
4288 WORKITEM_FREE(bmsafemap, D_BMSAFEMAP);
4292 handle_written_mkdir(WK_MKDIR(wk), MKDIR_BODY);
4296 adp = WK_ALLOCDIRECT(wk);
4297 adp->ad_state |= COMPLETE;
4298 handle_allocdirect_partdone(adp);
4302 aip = WK_ALLOCINDIR(wk);
4303 aip->ai_state |= COMPLETE;
4304 handle_allocindir_partdone(aip);
4308 indirdep = WK_INDIRDEP(wk);
4309 if (indirdep->ir_state & GOINGAWAY)
4310 panic("disk_write_complete: indirdep gone");
4311 bcopy(indirdep->ir_saveddata, bp->b_data, bp->b_bcount);
4312 FREE(indirdep->ir_saveddata, M_INDIRDEP);
4313 indirdep->ir_saveddata = 0;
4314 indirdep->ir_state &= ~UNDONE;
4315 indirdep->ir_state |= ATTACHED;
4316 while ((aip = LIST_FIRST(&indirdep->ir_donehd)) != 0) {
4317 handle_allocindir_partdone(aip);
4318 if (aip == LIST_FIRST(&indirdep->ir_donehd))
4319 panic("disk_write_complete: not gone");
4321 WORKLIST_INSERT(&reattach, wk);
4322 if ((bp->b_flags & B_DELWRI) == 0)
4323 stat_indir_blk_ptrs++;
4328 panic("handle_disk_write_complete: Unknown type %s",
4329 TYPENAME(wk->wk_type));
4334 * Reattach any requests that must be redone.
4336 while ((wk = LIST_FIRST(&reattach)) != NULL) {
4337 WORKLIST_REMOVE(wk);
4338 WORKLIST_INSERT(&bp->b_dep, wk);
4344 * Called from within softdep_disk_write_complete above. Note that
4345 * this routine is always called from interrupt level with further
4346 * splbio interrupts blocked.
4349 handle_allocdirect_partdone(adp)
4350 struct allocdirect *adp; /* the completed allocdirect */
4352 struct allocdirectlst *listhead;
4353 struct allocdirect *listadp;
4354 struct inodedep *inodedep;
4357 if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE)
4359 if (adp->ad_buf != NULL)
4360 panic("handle_allocdirect_partdone: dangling dep");
4362 * The on-disk inode cannot claim to be any larger than the last
4363 * fragment that has been written. Otherwise, the on-disk inode
4364 * might have fragments that were not the last block in the file
4365 * which would corrupt the filesystem. Thus, we cannot free any
4366 * allocdirects after one whose ad_oldblkno claims a fragment as
4367 * these blocks must be rolled back to zero before writing the inode.
4368 * We check the currently active set of allocdirects in id_inoupdt
4369 * or id_extupdt as appropriate.
4371 inodedep = adp->ad_inodedep;
4372 bsize = inodedep->id_fs->fs_bsize;
4373 if (adp->ad_state & EXTDATA)
4374 listhead = &inodedep->id_extupdt;
4376 listhead = &inodedep->id_inoupdt;
4377 TAILQ_FOREACH(listadp, listhead, ad_next) {
4378 /* found our block */
4381 /* continue if ad_oldlbn is not a fragment */
4382 if (listadp->ad_oldsize == 0 ||
4383 listadp->ad_oldsize == bsize)
4385 /* hit a fragment */
4389 * If we have reached the end of the current list without
4390 * finding the just finished dependency, then it must be
4391 * on the future dependency list. Future dependencies cannot
4392 * be freed until they are moved to the current list.
4394 if (listadp == NULL) {
4396 if (adp->ad_state & EXTDATA)
4397 listhead = &inodedep->id_newextupdt;
4399 listhead = &inodedep->id_newinoupdt;
4400 TAILQ_FOREACH(listadp, listhead, ad_next)
4401 /* found our block */
4404 if (listadp == NULL)
4405 panic("handle_allocdirect_partdone: lost dep");
4410 * If we have found the just finished dependency, then free
4411 * it along with anything that follows it that is complete.
4412 * If the inode still has a bitmap dependency, then it has
4413 * never been written to disk, hence the on-disk inode cannot
4414 * reference the old fragment so we can free it without delay.
4416 delay = (inodedep->id_state & DEPCOMPLETE);
4417 for (; adp; adp = listadp) {
4418 listadp = TAILQ_NEXT(adp, ad_next);
4419 if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE)
4421 free_allocdirect(listhead, adp, delay);
4426 * Called from within softdep_disk_write_complete above. Note that
4427 * this routine is always called from interrupt level with further
4428 * splbio interrupts blocked.
4431 handle_allocindir_partdone(aip)
4432 struct allocindir *aip; /* the completed allocindir */
4434 struct indirdep *indirdep;
4436 if ((aip->ai_state & ALLCOMPLETE) != ALLCOMPLETE)
4438 if (aip->ai_buf != NULL)
4439 panic("handle_allocindir_partdone: dangling dependency");
4440 indirdep = aip->ai_indirdep;
4441 if (indirdep->ir_state & UNDONE) {
4442 LIST_REMOVE(aip, ai_next);
4443 LIST_INSERT_HEAD(&indirdep->ir_donehd, aip, ai_next);
4446 if (indirdep->ir_state & UFS1FMT)
4447 ((ufs1_daddr_t *)indirdep->ir_savebp->b_data)[aip->ai_offset] =
4450 ((ufs2_daddr_t *)indirdep->ir_savebp->b_data)[aip->ai_offset] =
4452 LIST_REMOVE(aip, ai_next);
4453 if (aip->ai_freefrag != NULL)
4454 add_to_worklist(&aip->ai_freefrag->ff_list);
4455 WORKITEM_FREE(aip, D_ALLOCINDIR);
4459 * Called from within softdep_disk_write_complete above to restore
4460 * in-memory inode block contents to their most up-to-date state. Note
4461 * that this routine is always called from interrupt level with further
4462 * splbio interrupts blocked.
4465 handle_written_inodeblock(inodedep, bp)
4466 struct inodedep *inodedep;
4467 struct buf *bp; /* buffer containing the inode block */
4469 struct worklist *wk, *filefree;
4470 struct allocdirect *adp, *nextadp;
4471 struct ufs1_dinode *dp1 = NULL;
4472 struct ufs2_dinode *dp2 = NULL;
4473 int hadchanges, fstype;
4475 if ((inodedep->id_state & IOSTARTED) == 0)
4476 panic("handle_written_inodeblock: not started");
4477 inodedep->id_state &= ~IOSTARTED;
4478 if (inodedep->id_fs->fs_magic == FS_UFS1_MAGIC) {
4480 dp1 = (struct ufs1_dinode *)bp->b_data +
4481 ino_to_fsbo(inodedep->id_fs, inodedep->id_ino);
4484 dp2 = (struct ufs2_dinode *)bp->b_data +
4485 ino_to_fsbo(inodedep->id_fs, inodedep->id_ino);
4488 * If we had to rollback the inode allocation because of
4489 * bitmaps being incomplete, then simply restore it.
4490 * Keep the block dirty so that it will not be reclaimed until
4491 * all associated dependencies have been cleared and the
4492 * corresponding updates written to disk.
4494 if (inodedep->id_savedino1 != NULL) {
4496 *dp1 = *inodedep->id_savedino1;
4498 *dp2 = *inodedep->id_savedino2;
4499 FREE(inodedep->id_savedino1, M_SAVEDINO);
4500 inodedep->id_savedino1 = NULL;
4501 if ((bp->b_flags & B_DELWRI) == 0)
4502 stat_inode_bitmap++;
4506 inodedep->id_state |= COMPLETE;
4508 * Roll forward anything that had to be rolled back before
4509 * the inode could be updated.
4512 for (adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; adp = nextadp) {
4513 nextadp = TAILQ_NEXT(adp, ad_next);
4514 if (adp->ad_state & ATTACHED)
4515 panic("handle_written_inodeblock: new entry");
4516 if (fstype == UFS1) {
4517 if (adp->ad_lbn < NDADDR) {
4518 if (dp1->di_db[adp->ad_lbn]!=adp->ad_oldblkno)
4519 panic("%s %s #%jd mismatch %d != %jd",
4520 "handle_written_inodeblock:",
4522 (intmax_t)adp->ad_lbn,
4523 dp1->di_db[adp->ad_lbn],
4524 (intmax_t)adp->ad_oldblkno);
4525 dp1->di_db[adp->ad_lbn] = adp->ad_newblkno;
4527 if (dp1->di_ib[adp->ad_lbn - NDADDR] != 0)
4528 panic("%s: %s #%jd allocated as %d",
4529 "handle_written_inodeblock",
4531 (intmax_t)adp->ad_lbn - NDADDR,
4532 dp1->di_ib[adp->ad_lbn - NDADDR]);
4533 dp1->di_ib[adp->ad_lbn - NDADDR] =
4537 if (adp->ad_lbn < NDADDR) {
4538 if (dp2->di_db[adp->ad_lbn]!=adp->ad_oldblkno)
4539 panic("%s: %s #%jd %s %jd != %jd",
4540 "handle_written_inodeblock",
4542 (intmax_t)adp->ad_lbn, "mismatch",
4543 (intmax_t)dp2->di_db[adp->ad_lbn],
4544 (intmax_t)adp->ad_oldblkno);
4545 dp2->di_db[adp->ad_lbn] = adp->ad_newblkno;
4547 if (dp2->di_ib[adp->ad_lbn - NDADDR] != 0)
4548 panic("%s: %s #%jd allocated as %jd",
4549 "handle_written_inodeblock",
4551 (intmax_t)adp->ad_lbn - NDADDR,
4553 dp2->di_ib[adp->ad_lbn - NDADDR]);
4554 dp2->di_ib[adp->ad_lbn - NDADDR] =
4558 adp->ad_state &= ~UNDONE;
4559 adp->ad_state |= ATTACHED;
4562 for (adp = TAILQ_FIRST(&inodedep->id_extupdt); adp; adp = nextadp) {
4563 nextadp = TAILQ_NEXT(adp, ad_next);
4564 if (adp->ad_state & ATTACHED)
4565 panic("handle_written_inodeblock: new entry");
4566 if (dp2->di_extb[adp->ad_lbn] != adp->ad_oldblkno)
4567 panic("%s: direct pointers #%jd %s %jd != %jd",
4568 "handle_written_inodeblock",
4569 (intmax_t)adp->ad_lbn, "mismatch",
4570 (intmax_t)dp2->di_extb[adp->ad_lbn],
4571 (intmax_t)adp->ad_oldblkno);
4572 dp2->di_extb[adp->ad_lbn] = adp->ad_newblkno;
4573 adp->ad_state &= ~UNDONE;
4574 adp->ad_state |= ATTACHED;
4577 if (hadchanges && (bp->b_flags & B_DELWRI) == 0)
4578 stat_direct_blk_ptrs++;
4580 * Reset the file size to its most up-to-date value.
4582 if (inodedep->id_savedsize == -1 || inodedep->id_savedextsize == -1)
4583 panic("handle_written_inodeblock: bad size");
4584 if (fstype == UFS1) {
4585 if (dp1->di_size != inodedep->id_savedsize) {
4586 dp1->di_size = inodedep->id_savedsize;
4590 if (dp2->di_size != inodedep->id_savedsize) {
4591 dp2->di_size = inodedep->id_savedsize;
4594 if (dp2->di_extsize != inodedep->id_savedextsize) {
4595 dp2->di_extsize = inodedep->id_savedextsize;
4599 inodedep->id_savedsize = -1;
4600 inodedep->id_savedextsize = -1;
4602 * If there were any rollbacks in the inode block, then it must be
4603 * marked dirty so that its will eventually get written back in
4609 * Process any allocdirects that completed during the update.
4611 if ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != NULL)
4612 handle_allocdirect_partdone(adp);
4613 if ((adp = TAILQ_FIRST(&inodedep->id_extupdt)) != NULL)
4614 handle_allocdirect_partdone(adp);
4616 * Process deallocations that were held pending until the
4617 * inode had been written to disk. Freeing of the inode
4618 * is delayed until after all blocks have been freed to
4619 * avoid creation of new <vfsid, inum, lbn> triples
4620 * before the old ones have been deleted.
4623 while ((wk = LIST_FIRST(&inodedep->id_bufwait)) != NULL) {
4624 WORKLIST_REMOVE(wk);
4625 switch (wk->wk_type) {
4629 * We defer adding filefree to the worklist until
4630 * all other additions have been made to ensure
4631 * that it will be done after all the old blocks
4634 if (filefree != NULL)
4635 panic("handle_written_inodeblock: filefree");
4640 handle_written_mkdir(WK_MKDIR(wk), MKDIR_PARENT);
4644 diradd_inode_written(WK_DIRADD(wk), inodedep);
4648 wk->wk_state |= COMPLETE;
4649 if ((wk->wk_state & ALLCOMPLETE) != ALLCOMPLETE)
4651 /* -- fall through -- */
4654 add_to_worklist(wk);
4658 free_newdirblk(WK_NEWDIRBLK(wk));
4662 panic("handle_written_inodeblock: Unknown type %s",
4663 TYPENAME(wk->wk_type));
4667 if (filefree != NULL) {
4668 if (free_inodedep(inodedep) == 0)
4669 panic("handle_written_inodeblock: live inodedep");
4670 add_to_worklist(filefree);
4675 * If no outstanding dependencies, free it.
4677 if (free_inodedep(inodedep) ||
4678 (TAILQ_FIRST(&inodedep->id_inoupdt) == 0 &&
4679 TAILQ_FIRST(&inodedep->id_extupdt) == 0))
4681 return (hadchanges);
4685 * Process a diradd entry after its dependent inode has been written.
4686 * This routine must be called with splbio interrupts blocked.
4689 diradd_inode_written(dap, inodedep)
4691 struct inodedep *inodedep;
4693 struct pagedep *pagedep;
4695 dap->da_state |= COMPLETE;
4696 if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
4697 if (dap->da_state & DIRCHG)
4698 pagedep = dap->da_previous->dm_pagedep;
4700 pagedep = dap->da_pagedep;
4701 LIST_REMOVE(dap, da_pdlist);
4702 LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
4704 WORKLIST_INSERT(&inodedep->id_pendinghd, &dap->da_list);
4708 * Handle the completion of a mkdir dependency.
4711 handle_written_mkdir(mkdir, type)
4712 struct mkdir *mkdir;
4716 struct pagedep *pagedep;
4718 if (mkdir->md_state != type)
4719 panic("handle_written_mkdir: bad type");
4720 dap = mkdir->md_diradd;
4721 dap->da_state &= ~type;
4722 if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) == 0)
4723 dap->da_state |= DEPCOMPLETE;
4724 if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
4725 if (dap->da_state & DIRCHG)
4726 pagedep = dap->da_previous->dm_pagedep;
4728 pagedep = dap->da_pagedep;
4729 LIST_REMOVE(dap, da_pdlist);
4730 LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist);
4732 LIST_REMOVE(mkdir, md_mkdirs);
4733 WORKITEM_FREE(mkdir, D_MKDIR);
4737 * Called from within softdep_disk_write_complete above.
4738 * A write operation was just completed. Removed inodes can
4739 * now be freed and associated block pointers may be committed.
4740 * Note that this routine is always called from interrupt level
4741 * with further splbio interrupts blocked.
4744 handle_written_filepage(pagedep, bp)
4745 struct pagedep *pagedep;
4746 struct buf *bp; /* buffer containing the written page */
4748 struct dirrem *dirrem;
4749 struct diradd *dap, *nextdap;
4753 if ((pagedep->pd_state & IOSTARTED) == 0)
4754 panic("handle_written_filepage: not started");
4755 pagedep->pd_state &= ~IOSTARTED;
4757 * Process any directory removals that have been committed.
4759 while ((dirrem = LIST_FIRST(&pagedep->pd_dirremhd)) != NULL) {
4760 LIST_REMOVE(dirrem, dm_next);
4761 dirrem->dm_dirinum = pagedep->pd_ino;
4762 add_to_worklist(&dirrem->dm_list);
4765 * Free any directory additions that have been committed.
4766 * If it is a newly allocated block, we have to wait until
4767 * the on-disk directory inode claims the new block.
4769 if ((pagedep->pd_state & NEWBLOCK) == 0)
4770 while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != NULL)
4773 * Uncommitted directory entries must be restored.
4775 for (chgs = 0, i = 0; i < DAHASHSZ; i++) {
4776 for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); dap;
4778 nextdap = LIST_NEXT(dap, da_pdlist);
4779 if (dap->da_state & ATTACHED)
4780 panic("handle_written_filepage: attached");
4781 ep = (struct direct *)
4782 ((char *)bp->b_data + dap->da_offset);
4783 ep->d_ino = dap->da_newinum;
4784 dap->da_state &= ~UNDONE;
4785 dap->da_state |= ATTACHED;
4788 * If the inode referenced by the directory has
4789 * been written out, then the dependency can be
4790 * moved to the pending list.
4792 if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) {
4793 LIST_REMOVE(dap, da_pdlist);
4794 LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap,
4800 * If there were any rollbacks in the directory, then it must be
4801 * marked dirty so that its will eventually get written back in
4805 if ((bp->b_flags & B_DELWRI) == 0)
4811 * If we are not waiting for a new directory block to be
4812 * claimed by its inode, then the pagedep will be freed.
4813 * Otherwise it will remain to track any new entries on
4814 * the page in case they are fsync'ed.
4816 if ((pagedep->pd_state & NEWBLOCK) == 0) {
4817 LIST_REMOVE(pagedep, pd_hash);
4818 WORKITEM_FREE(pagedep, D_PAGEDEP);
4824 * Writing back in-core inode structures.
4826 * The filesystem only accesses an inode's contents when it occupies an
4827 * "in-core" inode structure. These "in-core" structures are separate from
4828 * the page frames used to cache inode blocks. Only the latter are
4829 * transferred to/from the disk. So, when the updated contents of the
4830 * "in-core" inode structure are copied to the corresponding in-memory inode
4831 * block, the dependencies are also transferred. The following procedure is
4832 * called when copying a dirty "in-core" inode to a cached inode block.
4836 * Called when an inode is loaded from disk. If the effective link count
4837 * differed from the actual link count when it was last flushed, then we
4838 * need to ensure that the correct effective link count is put back.
4841 softdep_load_inodeblock(ip)
4842 struct inode *ip; /* the "in_core" copy of the inode */
4844 struct inodedep *inodedep;
4847 * Check for alternate nlink count.
4849 ip->i_effnlink = ip->i_nlink;
4851 if (inodedep_lookup(UFSTOVFS(ip->i_ump),
4852 ip->i_number, 0, &inodedep) == 0) {
4856 ip->i_effnlink -= inodedep->id_nlinkdelta;
4857 if (inodedep->id_state & SPACECOUNTED)
4858 ip->i_flag |= IN_SPACECOUNTED;
4863 * This routine is called just before the "in-core" inode
4864 * information is to be copied to the in-memory inode block.
4865 * Recall that an inode block contains several inodes. If
4866 * the force flag is set, then the dependencies will be
4867 * cleared so that the update can always be made. Note that
4868 * the buffer is locked when this routine is called, so we
4869 * will never be in the middle of writing the inode block
4873 softdep_update_inodeblock(ip, bp, waitfor)
4874 struct inode *ip; /* the "in_core" copy of the inode */
4875 struct buf *bp; /* the buffer containing the inode block */
4876 int waitfor; /* nonzero => update must be allowed */
4878 struct inodedep *inodedep;
4879 struct worklist *wk;
4885 * If the effective link count is not equal to the actual link
4886 * count, then we must track the difference in an inodedep while
4887 * the inode is (potentially) tossed out of the cache. Otherwise,
4888 * if there is no existing inodedep, then there are no dependencies
4891 mp = UFSTOVFS(ip->i_ump);
4893 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) == 0) {
4895 if (ip->i_effnlink != ip->i_nlink)
4896 panic("softdep_update_inodeblock: bad link count");
4899 if (inodedep->id_nlinkdelta != ip->i_nlink - ip->i_effnlink)
4900 panic("softdep_update_inodeblock: bad delta");
4902 * Changes have been initiated. Anything depending on these
4903 * changes cannot occur until this inode has been written.
4905 inodedep->id_state &= ~COMPLETE;
4906 if ((inodedep->id_state & ONWORKLIST) == 0)
4907 WORKLIST_INSERT(&bp->b_dep, &inodedep->id_list);
4909 * Any new dependencies associated with the incore inode must
4910 * now be moved to the list associated with the buffer holding
4911 * the in-memory copy of the inode. Once merged process any
4912 * allocdirects that are completed by the merger.
4914 merge_inode_lists(&inodedep->id_newinoupdt, &inodedep->id_inoupdt);
4915 if (!TAILQ_EMPTY(&inodedep->id_inoupdt))
4916 handle_allocdirect_partdone(TAILQ_FIRST(&inodedep->id_inoupdt));
4917 merge_inode_lists(&inodedep->id_newextupdt, &inodedep->id_extupdt);
4918 if (!TAILQ_EMPTY(&inodedep->id_extupdt))
4919 handle_allocdirect_partdone(TAILQ_FIRST(&inodedep->id_extupdt));
4921 * Now that the inode has been pushed into the buffer, the
4922 * operations dependent on the inode being written to disk
4923 * can be moved to the id_bufwait so that they will be
4924 * processed when the buffer I/O completes.
4926 while ((wk = LIST_FIRST(&inodedep->id_inowait)) != NULL) {
4927 WORKLIST_REMOVE(wk);
4928 WORKLIST_INSERT(&inodedep->id_bufwait, wk);
4931 * Newly allocated inodes cannot be written until the bitmap
4932 * that allocates them have been written (indicated by
4933 * DEPCOMPLETE being set in id_state). If we are doing a
4934 * forced sync (e.g., an fsync on a file), we force the bitmap
4935 * to be written so that the update can be done.
4942 if ((inodedep->id_state & DEPCOMPLETE) != 0) {
4946 ibp = inodedep->id_buf;
4947 ibp = getdirtybuf(ibp, &lk, MNT_WAIT);
4950 * If ibp came back as NULL, the dependency could have been
4951 * freed while we slept. Look it up again, and check to see
4952 * that it has completed.
4954 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) != 0)
4960 if ((error = bwrite(ibp)) != 0)
4961 softdep_error("softdep_update_inodeblock: bwrite", error);
4965 * Merge the a new inode dependency list (such as id_newinoupdt) into an
4966 * old inode dependency list (such as id_inoupdt). This routine must be
4967 * called with splbio interrupts blocked.
4970 merge_inode_lists(newlisthead, oldlisthead)
4971 struct allocdirectlst *newlisthead;
4972 struct allocdirectlst *oldlisthead;
4974 struct allocdirect *listadp, *newadp;
4976 newadp = TAILQ_FIRST(newlisthead);
4977 for (listadp = TAILQ_FIRST(oldlisthead); listadp && newadp;) {
4978 if (listadp->ad_lbn < newadp->ad_lbn) {
4979 listadp = TAILQ_NEXT(listadp, ad_next);
4982 TAILQ_REMOVE(newlisthead, newadp, ad_next);
4983 TAILQ_INSERT_BEFORE(listadp, newadp, ad_next);
4984 if (listadp->ad_lbn == newadp->ad_lbn) {
4985 allocdirect_merge(oldlisthead, newadp,
4989 newadp = TAILQ_FIRST(newlisthead);
4991 while ((newadp = TAILQ_FIRST(newlisthead)) != NULL) {
4992 TAILQ_REMOVE(newlisthead, newadp, ad_next);
4993 TAILQ_INSERT_TAIL(oldlisthead, newadp, ad_next);
4998 * If we are doing an fsync, then we must ensure that any directory
4999 * entries for the inode have been written after the inode gets to disk.
5003 struct vnode *vp; /* the "in_core" copy of the inode */
5005 struct inodedep *inodedep;
5006 struct pagedep *pagedep;
5007 struct worklist *wk;
5014 struct thread *td = curthread;
5015 int error, flushparent, pagedep_new_block;
5023 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) == 0) {
5027 if (!LIST_EMPTY(&inodedep->id_inowait) ||
5028 !LIST_EMPTY(&inodedep->id_bufwait) ||
5029 !TAILQ_EMPTY(&inodedep->id_extupdt) ||
5030 !TAILQ_EMPTY(&inodedep->id_newextupdt) ||
5031 !TAILQ_EMPTY(&inodedep->id_inoupdt) ||
5032 !TAILQ_EMPTY(&inodedep->id_newinoupdt))
5033 panic("softdep_fsync: pending ops");
5034 for (error = 0, flushparent = 0; ; ) {
5035 if ((wk = LIST_FIRST(&inodedep->id_pendinghd)) == NULL)
5037 if (wk->wk_type != D_DIRADD)
5038 panic("softdep_fsync: Unexpected type %s",
5039 TYPENAME(wk->wk_type));
5040 dap = WK_DIRADD(wk);
5042 * Flush our parent if this directory entry has a MKDIR_PARENT
5043 * dependency or is contained in a newly allocated block.
5045 if (dap->da_state & DIRCHG)
5046 pagedep = dap->da_previous->dm_pagedep;
5048 pagedep = dap->da_pagedep;
5049 parentino = pagedep->pd_ino;
5050 lbn = pagedep->pd_lbn;
5051 if ((dap->da_state & (MKDIR_BODY | COMPLETE)) != COMPLETE)
5052 panic("softdep_fsync: dirty");
5053 if ((dap->da_state & MKDIR_PARENT) ||
5054 (pagedep->pd_state & NEWBLOCK))
5059 * If we are being fsync'ed as part of vgone'ing this vnode,
5060 * then we will not be able to release and recover the
5061 * vnode below, so we just have to give up on writing its
5062 * directory entry out. It will eventually be written, just
5063 * not now, but then the user was not asking to have it
5064 * written, so we are not breaking any promises.
5066 if (vp->v_iflag & VI_DOOMED)
5069 * We prevent deadlock by always fetching inodes from the
5070 * root, moving down the directory tree. Thus, when fetching
5071 * our parent directory, we first try to get the lock. If
5072 * that fails, we must unlock ourselves before requesting
5073 * the lock on our parent. See the comment in ufs_lookup
5074 * for details on possible races.
5077 if (ffs_vget(mp, parentino, LK_NOWAIT | LK_EXCLUSIVE, &pvp)) {
5079 error = ffs_vget(mp, parentino, LK_EXCLUSIVE, &pvp);
5080 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
5085 * All MKDIR_PARENT dependencies and all the NEWBLOCK pagedeps
5086 * that are contained in direct blocks will be resolved by
5087 * doing a ffs_update. Pagedeps contained in indirect blocks
5088 * may require a complete sync'ing of the directory. So, we
5089 * try the cheap and fast ffs_update first, and if that fails,
5090 * then we do the slower ffs_syncvnode of the directory.
5095 if ((error = ffs_update(pvp, 1)) != 0) {
5101 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) != 0) {
5102 if ((wk = LIST_FIRST(&inodedep->id_pendinghd)) != NULL) {
5103 if (wk->wk_type != D_DIRADD)
5104 panic("softdep_fsync: Unexpected type %s",
5105 TYPENAME(wk->wk_type));
5106 dap = WK_DIRADD(wk);
5107 if (dap->da_state & DIRCHG)
5108 pagedep = dap->da_previous->dm_pagedep;
5110 pagedep = dap->da_pagedep;
5111 pagedep_new_block = pagedep->pd_state & NEWBLOCK;
5114 if (pagedep_new_block &&
5115 (error = ffs_syncvnode(pvp, MNT_WAIT))) {
5125 * Flush directory page containing the inode's name.
5127 error = bread(pvp, lbn, blksize(fs, VTOI(pvp), lbn), td->td_ucred,
5137 if (inodedep_lookup(mp, ip->i_number, 0, &inodedep) == 0)
5145 * Flush all the dirty bitmaps associated with the block device
5146 * before flushing the rest of the dirty blocks so as to reduce
5147 * the number of dependencies that will have to be rolled back.
5150 softdep_fsync_mountdev(vp)
5153 struct buf *bp, *nbp;
5154 struct worklist *wk;
5157 if (!vn_isdisk(vp, NULL))
5158 panic("softdep_fsync_mountdev: vnode not a disk");
5163 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
5165 * If it is already scheduled, skip to the next buffer.
5167 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
5170 if ((bp->b_flags & B_DELWRI) == 0)
5171 panic("softdep_fsync_mountdev: not dirty");
5173 * We are only interested in bitmaps with outstanding
5176 if ((wk = LIST_FIRST(&bp->b_dep)) == NULL ||
5177 wk->wk_type != D_BMSAFEMAP ||
5178 (bp->b_vflags & BV_BKGRDINPROG)) {
5194 * This routine is called when we are trying to synchronously flush a
5195 * file. This routine must eliminate any filesystem metadata dependencies
5196 * so that the syncing routine can succeed by pushing the dirty blocks
5197 * associated with the file. If any I/O errors occur, they are returned.
5200 softdep_sync_metadata(struct vnode *vp)
5202 struct pagedep *pagedep;
5203 struct allocdirect *adp;
5204 struct allocindir *aip;
5205 struct buf *bp, *nbp;
5206 struct worklist *wk;
5208 int i, error, waitfor;
5210 if (!DOINGSOFTDEP(vp))
5213 * Ensure that any direct block dependencies have been cleared.
5216 if ((error = flush_inodedep_deps(vp->v_mount, VTOI(vp)->i_number))) {
5222 * For most files, the only metadata dependencies are the
5223 * cylinder group maps that allocate their inode or blocks.
5224 * The block allocation dependencies can be found by traversing
5225 * the dependency lists for any buffers that remain on their
5226 * dirty buffer list. The inode allocation dependency will
5227 * be resolved when the inode is updated with MNT_WAIT.
5228 * This work is done in two passes. The first pass grabs most
5229 * of the buffers and begins asynchronously writing them. The
5230 * only way to wait for these asynchronous writes is to sleep
5231 * on the filesystem vnode which may stay busy for a long time
5232 * if the filesystem is active. So, instead, we make a second
5233 * pass over the dependencies blocking on each write. In the
5234 * usual case we will be blocking against a write that we
5235 * initiated, so when it is done the dependency will have been
5236 * resolved. Thus the second pass is expected to end quickly.
5238 waitfor = MNT_NOWAIT;
5243 * We must wait for any I/O in progress to finish so that
5244 * all potential buffers on the dirty list will be visible.
5248 while ((bp = TAILQ_FIRST(&bo->bo_dirty.bv_hd)) != NULL) {
5249 bp = getdirtybuf(bp, BO_MTX(bo), MNT_WAIT);
5257 /* While syncing snapshots, we must allow recursive lookups */
5261 * As we hold the buffer locked, none of its dependencies
5264 LIST_FOREACH(wk, &bp->b_dep, wk_list) {
5265 switch (wk->wk_type) {
5268 adp = WK_ALLOCDIRECT(wk);
5269 if (adp->ad_state & DEPCOMPLETE)
5272 nbp = getdirtybuf(nbp, &lk, waitfor);
5276 if (waitfor == MNT_NOWAIT) {
5278 } else if ((error = bwrite(nbp)) != 0) {
5285 aip = WK_ALLOCINDIR(wk);
5286 if (aip->ai_state & DEPCOMPLETE)
5289 nbp = getdirtybuf(nbp, &lk, waitfor);
5293 if (waitfor == MNT_NOWAIT) {
5295 } else if ((error = bwrite(nbp)) != 0) {
5304 LIST_FOREACH(aip, &WK_INDIRDEP(wk)->ir_deplisthd, ai_next) {
5305 if (aip->ai_state & DEPCOMPLETE)
5308 nbp = getdirtybuf(nbp, &lk, MNT_WAIT);
5312 if ((error = bwrite(nbp)) != 0) {
5321 if ((error = flush_inodedep_deps(wk->wk_mp,
5322 WK_INODEDEP(wk)->id_ino)) != 0) {
5330 * We are trying to sync a directory that may
5331 * have dependencies on both its own metadata
5332 * and/or dependencies on the inodes of any
5333 * recently allocated files. We walk its diradd
5334 * lists pushing out the associated inode.
5336 pagedep = WK_PAGEDEP(wk);
5337 for (i = 0; i < DAHASHSZ; i++) {
5338 if (LIST_FIRST(&pagedep->pd_diraddhd[i]) == 0)
5341 flush_pagedep_deps(vp, wk->wk_mp,
5342 &pagedep->pd_diraddhd[i]))) {
5351 * This case should never happen if the vnode has
5352 * been properly sync'ed. However, if this function
5353 * is used at a place where the vnode has not yet
5354 * been sync'ed, this dependency can show up. So,
5355 * rather than panic, just flush it.
5357 nbp = WK_MKDIR(wk)->md_buf;
5358 nbp = getdirtybuf(nbp, &lk, waitfor);
5362 if (waitfor == MNT_NOWAIT) {
5364 } else if ((error = bwrite(nbp)) != 0) {
5372 * This case should never happen if the vnode has
5373 * been properly sync'ed. However, if this function
5374 * is used at a place where the vnode has not yet
5375 * been sync'ed, this dependency can show up. So,
5376 * rather than panic, just flush it.
5378 nbp = WK_BMSAFEMAP(wk)->sm_buf;
5379 nbp = getdirtybuf(nbp, &lk, waitfor);
5383 if (waitfor == MNT_NOWAIT) {
5385 } else if ((error = bwrite(nbp)) != 0) {
5392 panic("softdep_sync_metadata: Unknown type %s",
5393 TYPENAME(wk->wk_type));
5397 /* We reach here only in error and unlocked */
5399 panic("softdep_sync_metadata: zero error");
5406 while ((nbp = TAILQ_NEXT(bp, b_bobufs)) != NULL) {
5407 nbp = getdirtybuf(nbp, BO_MTX(bo), MNT_WAIT);
5419 * The brief unlock is to allow any pent up dependency
5420 * processing to be done. Then proceed with the second pass.
5422 if (waitfor == MNT_NOWAIT) {
5428 * If we have managed to get rid of all the dirty buffers,
5429 * then we are done. For certain directories and block
5430 * devices, we may need to do further work.
5432 * We must wait for any I/O in progress to finish so that
5433 * all potential buffers on the dirty list will be visible.
5442 * Flush the dependencies associated with an inodedep.
5443 * Called with splbio blocked.
5446 flush_inodedep_deps(mp, ino)
5450 struct inodedep *inodedep;
5454 * This work is done in two passes. The first pass grabs most
5455 * of the buffers and begins asynchronously writing them. The
5456 * only way to wait for these asynchronous writes is to sleep
5457 * on the filesystem vnode which may stay busy for a long time
5458 * if the filesystem is active. So, instead, we make a second
5459 * pass over the dependencies blocking on each write. In the
5460 * usual case we will be blocking against a write that we
5461 * initiated, so when it is done the dependency will have been
5462 * resolved. Thus the second pass is expected to end quickly.
5463 * We give a brief window at the top of the loop to allow
5464 * any pending I/O to complete.
5466 for (error = 0, waitfor = MNT_NOWAIT; ; ) {
5471 if (inodedep_lookup(mp, ino, 0, &inodedep) == 0)
5473 if (flush_deplist(&inodedep->id_inoupdt, waitfor, &error) ||
5474 flush_deplist(&inodedep->id_newinoupdt, waitfor, &error) ||
5475 flush_deplist(&inodedep->id_extupdt, waitfor, &error) ||
5476 flush_deplist(&inodedep->id_newextupdt, waitfor, &error))
5479 * If pass2, we are done, otherwise do pass 2.
5481 if (waitfor == MNT_WAIT)
5486 * Try freeing inodedep in case all dependencies have been removed.
5488 if (inodedep_lookup(mp, ino, 0, &inodedep) != 0)
5489 (void) free_inodedep(inodedep);
5494 * Flush an inode dependency list.
5495 * Called with splbio blocked.
5498 flush_deplist(listhead, waitfor, errorp)
5499 struct allocdirectlst *listhead;
5503 struct allocdirect *adp;
5506 mtx_assert(&lk, MA_OWNED);
5507 TAILQ_FOREACH(adp, listhead, ad_next) {
5508 if (adp->ad_state & DEPCOMPLETE)
5511 bp = getdirtybuf(bp, &lk, waitfor);
5513 if (waitfor == MNT_NOWAIT)
5518 if (waitfor == MNT_NOWAIT) {
5520 } else if ((*errorp = bwrite(bp)) != 0) {
5531 * Eliminate a pagedep dependency by flushing out all its diradd dependencies.
5532 * Called with splbio blocked.
5535 flush_pagedep_deps(pvp, mp, diraddhdp)
5538 struct diraddhd *diraddhdp;
5540 struct inodedep *inodedep;
5541 struct ufsmount *ump;
5548 struct worklist *wk;
5551 while ((dap = LIST_FIRST(diraddhdp)) != NULL) {
5553 * Flush ourselves if this directory entry
5554 * has a MKDIR_PARENT dependency.
5556 if (dap->da_state & MKDIR_PARENT) {
5558 if ((error = ffs_update(pvp, 1)) != 0)
5562 * If that cleared dependencies, go on to next.
5564 if (dap != LIST_FIRST(diraddhdp))
5566 if (dap->da_state & MKDIR_PARENT)
5567 panic("flush_pagedep_deps: MKDIR_PARENT");
5570 * A newly allocated directory must have its "." and
5571 * ".." entries written out before its name can be
5572 * committed in its parent. We do not want or need
5573 * the full semantics of a synchronous ffs_syncvnode as
5574 * that may end up here again, once for each directory
5575 * level in the filesystem. Instead, we push the blocks
5576 * and wait for them to clear. We have to fsync twice
5577 * because the first call may choose to defer blocks
5578 * that still have dependencies, but deferral will
5579 * happen at most once.
5581 inum = dap->da_newinum;
5582 if (dap->da_state & MKDIR_BODY) {
5584 if ((error = ffs_vget(mp, inum, LK_EXCLUSIVE, &vp)))
5586 if ((error=ffs_syncvnode(vp, MNT_NOWAIT)) ||
5587 (error=ffs_syncvnode(vp, MNT_NOWAIT))) {
5595 * If first block is still dirty with a D_MKDIR
5596 * dependency then it needs to be written now.
5600 bp = gbincore(bo, 0);
5602 break; /* First block not present */
5603 error = BUF_LOCK(bp,
5609 if (error == ENOLCK)
5610 continue; /* Slept, retry */
5613 if ((bp->b_flags & B_DELWRI) == 0) {
5615 break; /* Buffer not dirty */
5617 for (wk = LIST_FIRST(&bp->b_dep);
5619 wk = LIST_NEXT(wk, wk_list))
5620 if (wk->wk_type == D_MKDIR)
5623 BUF_UNLOCK(bp); /* Dependency gone */
5626 * D_MKDIR dependency remains,
5627 * must write buffer to stable
5640 break; /* Flushing of first block failed */
5643 * If that cleared dependencies, go on to next.
5645 if (dap != LIST_FIRST(diraddhdp))
5647 if (dap->da_state & MKDIR_BODY)
5648 panic("flush_pagedep_deps: MKDIR_BODY");
5651 * Flush the inode on which the directory entry depends.
5652 * Having accounted for MKDIR_PARENT and MKDIR_BODY above,
5653 * the only remaining dependency is that the updated inode
5654 * count must get pushed to disk. The inode has already
5655 * been pushed into its inode buffer (via VOP_UPDATE) at
5656 * the time of the reference count change. So we need only
5657 * locate that buffer, ensure that there will be no rollback
5658 * caused by a bitmap dependency, then write the inode buffer.
5661 if (inodedep_lookup(UFSTOVFS(ump), inum, 0, &inodedep) == 0)
5662 panic("flush_pagedep_deps: lost inode");
5664 * If the inode still has bitmap dependencies,
5665 * push them to disk.
5667 if ((inodedep->id_state & DEPCOMPLETE) == 0) {
5668 bp = inodedep->id_buf;
5669 bp = getdirtybuf(bp, &lk, MNT_WAIT);
5673 if ((error = bwrite(bp)) != 0)
5676 if (dap != LIST_FIRST(diraddhdp))
5680 * If the inode is still sitting in a buffer waiting
5681 * to be written, push it to disk.
5684 if ((error = bread(ump->um_devvp,
5685 fsbtodb(ump->um_fs, ino_to_fsba(ump->um_fs, inum)),
5686 (int)ump->um_fs->fs_bsize, NOCRED, &bp)) != 0) {
5690 if ((error = bwrite(bp)) != 0)
5694 * If we have failed to get rid of all the dependencies
5695 * then something is seriously wrong.
5697 if (dap == LIST_FIRST(diraddhdp))
5698 panic("flush_pagedep_deps: flush failed");
5706 * A large burst of file addition or deletion activity can drive the
5707 * memory load excessively high. First attempt to slow things down
5708 * using the techniques below. If that fails, this routine requests
5709 * the offending operations to fall back to running synchronously
5710 * until the memory load returns to a reasonable level.
5713 softdep_slowdown(vp)
5716 int max_softdeps_hard;
5719 max_softdeps_hard = max_softdeps * 11 / 10;
5720 if (num_dirrem < max_softdeps_hard / 2 &&
5721 num_inodedep < max_softdeps_hard &&
5722 VFSTOUFS(vp->v_mount)->um_numindirdeps < maxindirdeps) {
5726 if (VFSTOUFS(vp->v_mount)->um_numindirdeps >= maxindirdeps)
5728 stat_sync_limit_hit += 1;
5734 * Called by the allocation routines when they are about to fail
5735 * in the hope that we can free up some disk space.
5737 * First check to see if the work list has anything on it. If it has,
5738 * clean up entries until we successfully free some space. Because this
5739 * process holds inodes locked, we cannot handle any remove requests
5740 * that might block on a locked inode as that could lead to deadlock.
5741 * If the worklist yields no free space, encourage the syncer daemon
5742 * to help us. In no event will we try for longer than tickdelay seconds.
5745 softdep_request_cleanup(fs, vp)
5749 struct ufsmount *ump;
5751 ufs2_daddr_t needed;
5754 ump = VTOI(vp)->i_ump;
5755 mtx_assert(UFS_MTX(ump), MA_OWNED);
5756 needed = fs->fs_cstotal.cs_nbfree + fs->fs_contigsumsize;
5757 starttime = time_second + tickdelay;
5759 * If we are being called because of a process doing a
5760 * copy-on-write, then it is not safe to update the vnode
5761 * as we may recurse into the copy-on-write routine.
5763 if (!(curthread->td_pflags & TDP_COWINPROGRESS)) {
5765 error = ffs_update(vp, 1);
5770 while (fs->fs_pendingblocks > 0 && fs->fs_cstotal.cs_nbfree <= needed) {
5771 if (time_second > starttime)
5775 if (ump->softdep_on_worklist > 0 &&
5776 process_worklist_item(UFSTOVFS(ump), LK_NOWAIT) != -1) {
5777 stat_worklist_push += 1;
5782 request_cleanup(UFSTOVFS(ump), FLUSH_REMOVE_WAIT);
5790 * If memory utilization has gotten too high, deliberately slow things
5791 * down and speed up the I/O processing.
5793 extern struct thread *syncertd;
5795 request_cleanup(mp, resource)
5799 struct thread *td = curthread;
5800 struct ufsmount *ump;
5802 mtx_assert(&lk, MA_OWNED);
5804 * We never hold up the filesystem syncer or buf daemon.
5806 if (td->td_pflags & (TDP_SOFTDEP|TDP_NORUNNINGBUF))
5810 * First check to see if the work list has gotten backlogged.
5811 * If it has, co-opt this process to help clean up two entries.
5812 * Because this process may hold inodes locked, we cannot
5813 * handle any remove requests that might block on a locked
5814 * inode as that could lead to deadlock. We set TDP_SOFTDEP
5815 * to avoid recursively processing the worklist.
5817 if (ump->softdep_on_worklist > max_softdeps / 10) {
5818 td->td_pflags |= TDP_SOFTDEP;
5819 process_worklist_item(mp, LK_NOWAIT);
5820 process_worklist_item(mp, LK_NOWAIT);
5821 td->td_pflags &= ~TDP_SOFTDEP;
5822 stat_worklist_push += 2;
5826 * Next, we attempt to speed up the syncer process. If that
5827 * is successful, then we allow the process to continue.
5829 if (softdep_speedup() && resource != FLUSH_REMOVE_WAIT)
5832 * If we are resource constrained on inode dependencies, try
5833 * flushing some dirty inodes. Otherwise, we are constrained
5834 * by file deletions, so try accelerating flushes of directories
5835 * with removal dependencies. We would like to do the cleanup
5836 * here, but we probably hold an inode locked at this point and
5837 * that might deadlock against one that we try to clean. So,
5838 * the best that we can do is request the syncer daemon to do
5839 * the cleanup for us.
5844 stat_ino_limit_push += 1;
5845 req_clear_inodedeps += 1;
5846 stat_countp = &stat_ino_limit_hit;
5850 case FLUSH_REMOVE_WAIT:
5851 stat_blk_limit_push += 1;
5852 req_clear_remove += 1;
5853 stat_countp = &stat_blk_limit_hit;
5857 panic("request_cleanup: unknown type");
5860 * Hopefully the syncer daemon will catch up and awaken us.
5861 * We wait at most tickdelay before proceeding in any case.
5864 if (callout_pending(&softdep_callout) == FALSE)
5865 callout_reset(&softdep_callout, tickdelay > 2 ? tickdelay : 2,
5868 msleep((caddr_t)&proc_waiting, &lk, PPAUSE, "softupdate", 0);
5874 * Awaken processes pausing in request_cleanup and clear proc_waiting
5875 * to indicate that there is no longer a timer running.
5883 * The callout_ API has acquired mtx and will hold it around this
5887 wakeup_one(&proc_waiting);
5888 if (proc_waiting > 0)
5889 callout_reset(&softdep_callout, tickdelay > 2 ? tickdelay : 2,
5894 * Flush out a directory with at least one removal dependency in an effort to
5895 * reduce the number of dirrem, freefile, and freeblks dependency structures.
5901 struct pagedep_hashhead *pagedephd;
5902 struct pagedep *pagedep;
5903 static int next = 0;
5910 mtx_assert(&lk, MA_OWNED);
5912 for (cnt = 0; cnt < pagedep_hash; cnt++) {
5913 pagedephd = &pagedep_hashtbl[next++];
5914 if (next >= pagedep_hash)
5916 LIST_FOREACH(pagedep, pagedephd, pd_hash) {
5917 if (LIST_EMPTY(&pagedep->pd_dirremhd))
5919 mp = pagedep->pd_list.wk_mp;
5920 ino = pagedep->pd_ino;
5921 if (vn_start_write(NULL, &mp, V_NOWAIT) != 0)
5924 if ((error = ffs_vget(mp, ino, LK_EXCLUSIVE, &vp))) {
5925 softdep_error("clear_remove: vget", error);
5926 vn_finished_write(mp);
5930 if ((error = ffs_syncvnode(vp, MNT_NOWAIT)))
5931 softdep_error("clear_remove: fsync", error);
5937 vn_finished_write(mp);
5945 * Clear out a block of dirty inodes in an effort to reduce
5946 * the number of inodedep dependency structures.
5952 struct inodedep_hashhead *inodedephd;
5953 struct inodedep *inodedep;
5954 static int next = 0;
5959 ino_t firstino, lastino, ino;
5961 mtx_assert(&lk, MA_OWNED);
5963 * Pick a random inode dependency to be cleared.
5964 * We will then gather up all the inodes in its block
5965 * that have dependencies and flush them out.
5967 for (cnt = 0; cnt < inodedep_hash; cnt++) {
5968 inodedephd = &inodedep_hashtbl[next++];
5969 if (next >= inodedep_hash)
5971 if ((inodedep = LIST_FIRST(inodedephd)) != NULL)
5974 if (inodedep == NULL)
5976 fs = inodedep->id_fs;
5977 mp = inodedep->id_list.wk_mp;
5979 * Find the last inode in the block with dependencies.
5981 firstino = inodedep->id_ino & ~(INOPB(fs) - 1);
5982 for (lastino = firstino + INOPB(fs) - 1; lastino > firstino; lastino--)
5983 if (inodedep_lookup(mp, lastino, 0, &inodedep) != 0)
5986 * Asynchronously push all but the last inode with dependencies.
5987 * Synchronously push the last inode with dependencies to ensure
5988 * that the inode block gets written to free up the inodedeps.
5990 for (ino = firstino; ino <= lastino; ino++) {
5991 if (inodedep_lookup(mp, ino, 0, &inodedep) == 0)
5993 if (vn_start_write(NULL, &mp, V_NOWAIT) != 0)
5996 if ((error = ffs_vget(mp, ino, LK_EXCLUSIVE, &vp)) != 0) {
5997 softdep_error("clear_inodedeps: vget", error);
5998 vn_finished_write(mp);
6002 if (ino == lastino) {
6003 if ((error = ffs_syncvnode(vp, MNT_WAIT)))
6004 softdep_error("clear_inodedeps: fsync1", error);
6006 if ((error = ffs_syncvnode(vp, MNT_NOWAIT)))
6007 softdep_error("clear_inodedeps: fsync2", error);
6008 BO_LOCK(&vp->v_bufobj);
6010 BO_UNLOCK(&vp->v_bufobj);
6013 vn_finished_write(mp);
6019 * Function to determine if the buffer has outstanding dependencies
6020 * that will cause a roll-back if the buffer is written. If wantcount
6021 * is set, return number of dependencies, otherwise just yes or no.
6024 softdep_count_dependencies(bp, wantcount)
6028 struct worklist *wk;
6029 struct inodedep *inodedep;
6030 struct indirdep *indirdep;
6031 struct allocindir *aip;
6032 struct pagedep *pagedep;
6038 LIST_FOREACH(wk, &bp->b_dep, wk_list) {
6039 switch (wk->wk_type) {
6042 inodedep = WK_INODEDEP(wk);
6043 if ((inodedep->id_state & DEPCOMPLETE) == 0) {
6044 /* bitmap allocation dependency */
6049 if (TAILQ_FIRST(&inodedep->id_inoupdt)) {
6050 /* direct block pointer dependency */
6055 if (TAILQ_FIRST(&inodedep->id_extupdt)) {
6056 /* direct block pointer dependency */
6064 indirdep = WK_INDIRDEP(wk);
6066 LIST_FOREACH(aip, &indirdep->ir_deplisthd, ai_next) {
6067 /* indirect block pointer dependency */
6075 pagedep = WK_PAGEDEP(wk);
6076 for (i = 0; i < DAHASHSZ; i++) {
6078 LIST_FOREACH(dap, &pagedep->pd_diraddhd[i], da_pdlist) {
6079 /* directory entry dependency */
6091 /* never a dependency on these blocks */
6095 panic("softdep_check_for_rollback: Unexpected type %s",
6096 TYPENAME(wk->wk_type));
6106 * Acquire exclusive access to a buffer.
6107 * Must be called with a locked mtx parameter.
6108 * Return acquired buffer or NULL on failure.
6111 getdirtybuf(bp, mtx, waitfor)
6118 mtx_assert(mtx, MA_OWNED);
6119 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL) != 0) {
6120 if (waitfor != MNT_WAIT)
6122 error = BUF_LOCK(bp,
6123 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, mtx);
6125 * Even if we sucessfully acquire bp here, we have dropped
6126 * mtx, which may violates our guarantee.
6130 else if (error != ENOLCK)
6131 panic("getdirtybuf: inconsistent lock: %d", error);
6135 if ((bp->b_vflags & BV_BKGRDINPROG) != 0) {
6136 if (mtx == &lk && waitfor == MNT_WAIT) {
6138 BO_LOCK(bp->b_bufobj);
6140 if ((bp->b_vflags & BV_BKGRDINPROG) != 0) {
6141 bp->b_vflags |= BV_BKGRDWAIT;
6142 msleep(&bp->b_xflags, BO_MTX(bp->b_bufobj),
6143 PRIBIO | PDROP, "getbuf", 0);
6145 BO_UNLOCK(bp->b_bufobj);
6150 if (waitfor != MNT_WAIT)
6153 * The mtx argument must be bp->b_vp's mutex in
6156 #ifdef DEBUG_VFS_LOCKS
6157 if (bp->b_vp->v_type != VCHR)
6158 ASSERT_BO_LOCKED(bp->b_bufobj);
6160 bp->b_vflags |= BV_BKGRDWAIT;
6161 msleep(&bp->b_xflags, mtx, PRIBIO, "getbuf", 0);
6164 if ((bp->b_flags & B_DELWRI) == 0) {
6174 * Check if it is safe to suspend the file system now. On entry,
6175 * the vnode interlock for devvp should be held. Return 0 with
6176 * the mount interlock held if the file system can be suspended now,
6177 * otherwise return EAGAIN with the mount interlock held.
6180 softdep_check_suspend(struct mount *mp,
6181 struct vnode *devvp,
6183 int softdep_accdeps,
6184 int secondary_writes,
6185 int secondary_accwrites)
6188 struct ufsmount *ump;
6192 bo = &devvp->v_bufobj;
6193 ASSERT_BO_LOCKED(bo);
6196 if (!TRY_ACQUIRE_LOCK(&lk)) {
6204 if (mp->mnt_secondary_writes != 0) {
6207 msleep(&mp->mnt_secondary_writes,
6209 (PUSER - 1) | PDROP, "secwr", 0);
6217 * Reasons for needing more work before suspend:
6218 * - Dirty buffers on devvp.
6219 * - Softdep activity occurred after start of vnode sync loop
6220 * - Secondary writes occurred after start of vnode sync loop
6223 if (bo->bo_numoutput > 0 ||
6224 bo->bo_dirty.bv_cnt > 0 ||
6225 softdep_deps != 0 ||
6226 ump->softdep_deps != 0 ||
6227 softdep_accdeps != ump->softdep_accdeps ||
6228 secondary_writes != 0 ||
6229 mp->mnt_secondary_writes != 0 ||
6230 secondary_accwrites != mp->mnt_secondary_accwrites)
6239 * Get the number of dependency structures for the file system, both
6240 * the current number and the total number allocated. These will
6241 * later be used to detect that softdep processing has occurred.
6244 softdep_get_depcounts(struct mount *mp,
6246 int *softdep_accdepsp)
6248 struct ufsmount *ump;
6252 *softdep_depsp = ump->softdep_deps;
6253 *softdep_accdepsp = ump->softdep_accdeps;
6258 * Wait for pending output on a vnode to complete.
6259 * Must be called with vnode lock and interlock locked.
6261 * XXX: Should just be a call to bufobj_wwait().
6270 ASSERT_VOP_LOCKED(vp, "drain_output");
6271 ASSERT_BO_LOCKED(bo);
6273 while (bo->bo_numoutput) {
6274 bo->bo_flag |= BO_WWAIT;
6275 msleep((caddr_t)&bo->bo_numoutput,
6276 BO_MTX(bo), PRIBIO + 1, "drainvp", 0);
6281 * Called whenever a buffer that is being invalidated or reallocated
6282 * contains dependencies. This should only happen if an I/O error has
6283 * occurred. The routine is called with the buffer locked.
6286 softdep_deallocate_dependencies(bp)
6290 if ((bp->b_ioflags & BIO_ERROR) == 0)
6291 panic("softdep_deallocate_dependencies: dangling deps");
6292 softdep_error(bp->b_vp->v_mount->mnt_stat.f_mntonname, bp->b_error);
6293 panic("softdep_deallocate_dependencies: unrecovered I/O error");
6297 * Function to handle asynchronous write errors in the filesystem.
6300 softdep_error(func, error)
6305 /* XXX should do something better! */
6306 printf("%s: got error %d while accessing filesystem\n", func, error);
6309 #endif /* SOFTUPDATES */