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
39 * $FreeBSD: src/sys/ufs/ffs/ffs_softdep.c,v 1.57.2.11 2002/02/05 18:46:53 dillon Exp $
40 * $DragonFly: src/sys/vfs/ufs/ffs_softdep.c,v 1.57 2008/06/28 17:59:51 dillon Exp $
44 * For now we want the safety net that the DIAGNOSTIC and DEBUG flags provide.
53 #include <sys/param.h>
54 #include <sys/kernel.h>
55 #include <sys/systm.h>
57 #include <sys/malloc.h>
58 #include <sys/mount.h>
60 #include <sys/syslog.h>
61 #include <sys/vnode.h>
64 #include <machine/inttypes.h>
71 #include "ffs_extern.h"
72 #include "ufs_extern.h"
74 #include <sys/thread2.h>
77 * These definitions need to be adapted to the system to which
78 * this file is being ported.
81 * malloc types defined for the softdep system.
83 MALLOC_DEFINE(M_PAGEDEP
, "pagedep","File page dependencies");
84 MALLOC_DEFINE(M_INODEDEP
, "inodedep","Inode dependencies");
85 MALLOC_DEFINE(M_NEWBLK
, "newblk","New block allocation");
86 MALLOC_DEFINE(M_BMSAFEMAP
, "bmsafemap","Block or frag allocated from cyl group map");
87 MALLOC_DEFINE(M_ALLOCDIRECT
, "allocdirect","Block or frag dependency for an inode");
88 MALLOC_DEFINE(M_INDIRDEP
, "indirdep","Indirect block dependencies");
89 MALLOC_DEFINE(M_ALLOCINDIR
, "allocindir","Block dependency for an indirect block");
90 MALLOC_DEFINE(M_FREEFRAG
, "freefrag","Previously used frag for an inode");
91 MALLOC_DEFINE(M_FREEBLKS
, "freeblks","Blocks freed from an inode");
92 MALLOC_DEFINE(M_FREEFILE
, "freefile","Inode deallocated");
93 MALLOC_DEFINE(M_DIRADD
, "diradd","New directory entry");
94 MALLOC_DEFINE(M_MKDIR
, "mkdir","New directory");
95 MALLOC_DEFINE(M_DIRREM
, "dirrem","Directory entry deleted");
97 #define M_SOFTDEP_FLAGS (M_WAITOK | M_USE_RESERVE)
102 #define D_BMSAFEMAP 3
103 #define D_ALLOCDIRECT 4
105 #define D_ALLOCINDIR 6
112 #define D_LAST D_DIRREM
115 * translate from workitem type to memory type
116 * MUST match the defines above, such that memtype[D_XXX] == M_XXX
118 static struct malloc_type
*memtype
[] = {
134 #define DtoM(type) (memtype[type])
137 * Names of malloc types.
139 #define TYPENAME(type) \
140 ((unsigned)(type) < D_LAST ? memtype[type]->ks_shortdesc : "???")
142 * End system adaptaion definitions.
146 * Internal function prototypes.
148 static void softdep_error(char *, int);
149 static void drain_output(struct vnode
*, int);
150 static int getdirtybuf(struct buf
**, int);
151 static void clear_remove(struct thread
*);
152 static void clear_inodedeps(struct thread
*);
153 static int flush_pagedep_deps(struct vnode
*, struct mount
*,
155 static int flush_inodedep_deps(struct fs
*, ino_t
);
156 static int handle_written_filepage(struct pagedep
*, struct buf
*);
157 static void diradd_inode_written(struct diradd
*, struct inodedep
*);
158 static int handle_written_inodeblock(struct inodedep
*, struct buf
*);
159 static void handle_allocdirect_partdone(struct allocdirect
*);
160 static void handle_allocindir_partdone(struct allocindir
*);
161 static void initiate_write_filepage(struct pagedep
*, struct buf
*);
162 static void handle_written_mkdir(struct mkdir
*, int);
163 static void initiate_write_inodeblock(struct inodedep
*, struct buf
*);
164 static void handle_workitem_freefile(struct freefile
*);
165 static void handle_workitem_remove(struct dirrem
*);
166 static struct dirrem
*newdirrem(struct buf
*, struct inode
*,
167 struct inode
*, int, struct dirrem
**);
168 static void free_diradd(struct diradd
*);
169 static void free_allocindir(struct allocindir
*, struct inodedep
*);
170 static int indir_trunc (struct inode
*, off_t
, int, ufs_lbn_t
, long *);
171 static void deallocate_dependencies(struct buf
*, struct inodedep
*);
172 static void free_allocdirect(struct allocdirectlst
*,
173 struct allocdirect
*, int);
174 static int check_inode_unwritten(struct inodedep
*);
175 static int free_inodedep(struct inodedep
*);
176 static void handle_workitem_freeblocks(struct freeblks
*);
177 static void merge_inode_lists(struct inodedep
*);
178 static void setup_allocindir_phase2(struct buf
*, struct inode
*,
179 struct allocindir
*);
180 static struct allocindir
*newallocindir(struct inode
*, int, ufs_daddr_t
,
182 static void handle_workitem_freefrag(struct freefrag
*);
183 static struct freefrag
*newfreefrag(struct inode
*, ufs_daddr_t
, long);
184 static void allocdirect_merge(struct allocdirectlst
*,
185 struct allocdirect
*, struct allocdirect
*);
186 static struct bmsafemap
*bmsafemap_lookup(struct buf
*);
187 static int newblk_lookup(struct fs
*, ufs_daddr_t
, int,
189 static int inodedep_lookup(struct fs
*, ino_t
, int, struct inodedep
**);
190 static int pagedep_lookup(struct inode
*, ufs_lbn_t
, int,
192 static void pause_timer(void *);
193 static int request_cleanup(int, int);
194 static int process_worklist_item(struct mount
*, int);
195 static void add_to_worklist(struct worklist
*);
198 * Exported softdep operations.
200 static void softdep_disk_io_initiation(struct buf
*);
201 static void softdep_disk_write_complete(struct buf
*);
202 static void softdep_deallocate_dependencies(struct buf
*);
203 static int softdep_fsync(struct vnode
*);
204 static int softdep_process_worklist(struct mount
*);
205 static void softdep_move_dependencies(struct buf
*, struct buf
*);
206 static int softdep_count_dependencies(struct buf
*bp
, int);
207 static int softdep_checkread(struct buf
*bp
);
208 static int softdep_checkwrite(struct buf
*bp
);
210 static struct bio_ops softdep_bioops
= {
211 .io_start
= softdep_disk_io_initiation
,
212 .io_complete
= softdep_disk_write_complete
,
213 .io_deallocate
= softdep_deallocate_dependencies
,
214 .io_fsync
= softdep_fsync
,
215 .io_sync
= softdep_process_worklist
,
216 .io_movedeps
= softdep_move_dependencies
,
217 .io_countdeps
= softdep_count_dependencies
,
218 .io_checkread
= softdep_checkread
,
219 .io_checkwrite
= softdep_checkwrite
223 * Locking primitives.
225 * For a uniprocessor, all we need to do is protect against disk
226 * interrupts. For a multiprocessor, this lock would have to be
227 * a mutex. A single mutex is used throughout this file, though
228 * finer grain locking could be used if contention warranted it.
230 * For a multiprocessor, the sleep call would accept a lock and
231 * release it after the sleep processing was complete. In a uniprocessor
232 * implementation there is no such interlock, so we simple mark
233 * the places where it needs to be done with the `interlocked' form
234 * of the lock calls. Since the uniprocessor sleep already interlocks
235 * the spl, there is nothing that really needs to be done.
237 #ifndef /* NOT */ DEBUG
238 static struct lockit
{
240 #define ACQUIRE_LOCK(lk) crit_enter_id("softupdates");
241 #define FREE_LOCK(lk) crit_exit_id("softupdates");
244 #define NOHOLDER ((struct thread *)-1)
245 #define SPECIAL_FLAG ((struct thread *)-2)
246 static struct lockit
{
248 struct thread
*lkt_held
;
249 } lk
= { 0, NOHOLDER
};
252 static void acquire_lock(struct lockit
*);
253 static void free_lock(struct lockit
*);
254 void softdep_panic(char *);
256 #define ACQUIRE_LOCK(lk) acquire_lock(lk)
257 #define FREE_LOCK(lk) free_lock(lk)
260 acquire_lock(struct lockit
*lk
)
264 if (lk
->lkt_held
!= NOHOLDER
) {
265 holder
= lk
->lkt_held
;
267 if (holder
== curthread
)
268 panic("softdep_lock: locking against myself");
270 panic("softdep_lock: lock held by %p", holder
);
272 crit_enter_id("softupdates");
273 lk
->lkt_held
= curthread
;
278 free_lock(struct lockit
*lk
)
281 if (lk
->lkt_held
== NOHOLDER
)
282 panic("softdep_unlock: lock not held");
283 lk
->lkt_held
= NOHOLDER
;
284 crit_exit_id("softupdates");
288 * Function to release soft updates lock and panic.
291 softdep_panic(char *msg
)
294 if (lk
.lkt_held
!= NOHOLDER
)
300 static int interlocked_sleep(struct lockit
*, int, void *, int,
304 * When going to sleep, we must save our SPL so that it does
305 * not get lost if some other process uses the lock while we
306 * are sleeping. We restore it after we have slept. This routine
307 * wraps the interlocking with functions that sleep. The list
308 * below enumerates the available set of operations.
315 interlocked_sleep(struct lockit
*lk
, int op
, void *ident
, int flags
,
316 const char *wmesg
, int timo
)
323 if (lk
->lkt_held
== NOHOLDER
)
324 panic("interlocked_sleep: lock not held");
325 lk
->lkt_held
= NOHOLDER
;
329 retval
= tsleep(ident
, flags
, wmesg
, timo
);
332 retval
= BUF_LOCK((struct buf
*)ident
, flags
);
335 panic("interlocked_sleep: unknown operation");
338 if (lk
->lkt_held
!= NOHOLDER
) {
339 holder
= lk
->lkt_held
;
341 if (holder
== curthread
)
342 panic("interlocked_sleep: locking against self");
344 panic("interlocked_sleep: lock held by %p", holder
);
346 lk
->lkt_held
= curthread
;
354 * Place holder for real semaphores.
363 static void sema_init(struct sema
*, char *, int, int);
364 static int sema_get(struct sema
*, struct lockit
*);
365 static void sema_release(struct sema
*);
368 sema_init(struct sema
*semap
, char *name
, int prio
, int timo
)
371 semap
->holder
= NOHOLDER
;
379 sema_get(struct sema
*semap
, struct lockit
*interlock
)
382 if (semap
->value
++ > 0) {
383 if (interlock
!= NULL
) {
384 interlocked_sleep(interlock
, SLEEP
, (caddr_t
)semap
,
385 semap
->prio
, semap
->name
, semap
->timo
);
386 FREE_LOCK(interlock
);
388 tsleep((caddr_t
)semap
, semap
->prio
, semap
->name
,
393 semap
->holder
= curthread
;
394 if (interlock
!= NULL
)
395 FREE_LOCK(interlock
);
400 sema_release(struct sema
*semap
)
403 if (semap
->value
<= 0 || semap
->holder
!= curthread
) {
404 if (lk
.lkt_held
!= NOHOLDER
)
406 panic("sema_release: not held");
408 if (--semap
->value
> 0) {
412 semap
->holder
= NOHOLDER
;
416 * Worklist queue management.
417 * These routines require that the lock be held.
419 #ifndef /* NOT */ DEBUG
420 #define WORKLIST_INSERT(head, item) do { \
421 (item)->wk_state |= ONWORKLIST; \
422 LIST_INSERT_HEAD(head, item, wk_list); \
425 #define WORKLIST_INSERT_BP(bp, item) do { \
426 (item)->wk_state |= ONWORKLIST; \
427 (bp)->b_ops = &softdep_bioops; \
428 LIST_INSERT_HEAD(&(bp)->b_dep, item, wk_list); \
431 #define WORKLIST_REMOVE(item) do { \
432 (item)->wk_state &= ~ONWORKLIST; \
433 LIST_REMOVE(item, wk_list); \
436 #define WORKITEM_FREE(item, type) FREE(item, DtoM(type))
439 static void worklist_insert(struct workhead
*, struct worklist
*);
440 static void worklist_remove(struct worklist
*);
441 static void workitem_free(struct worklist
*, int);
443 #define WORKLIST_INSERT_BP(bp, item) do { \
444 (bp)->b_ops = &softdep_bioops; \
445 worklist_insert(&(bp)->b_dep, item); \
448 #define WORKLIST_INSERT(head, item) worklist_insert(head, item)
449 #define WORKLIST_REMOVE(item) worklist_remove(item)
450 #define WORKITEM_FREE(item, type) workitem_free((struct worklist *)item, type)
453 worklist_insert(struct workhead
*head
, struct worklist
*item
)
456 if (lk
.lkt_held
== NOHOLDER
)
457 panic("worklist_insert: lock not held");
458 if (item
->wk_state
& ONWORKLIST
) {
460 panic("worklist_insert: already on list");
462 item
->wk_state
|= ONWORKLIST
;
463 LIST_INSERT_HEAD(head
, item
, wk_list
);
467 worklist_remove(struct worklist
*item
)
470 if (lk
.lkt_held
== NOHOLDER
)
471 panic("worklist_remove: lock not held");
472 if ((item
->wk_state
& ONWORKLIST
) == 0) {
474 panic("worklist_remove: not on list");
476 item
->wk_state
&= ~ONWORKLIST
;
477 LIST_REMOVE(item
, wk_list
);
481 workitem_free(struct worklist
*item
, int type
)
484 if (item
->wk_state
& ONWORKLIST
) {
485 if (lk
.lkt_held
!= NOHOLDER
)
487 panic("workitem_free: still on list");
489 if (item
->wk_type
!= type
) {
490 if (lk
.lkt_held
!= NOHOLDER
)
492 panic("workitem_free: type mismatch");
494 FREE(item
, DtoM(type
));
499 * Workitem queue management
501 static struct workhead softdep_workitem_pending
;
502 static int num_on_worklist
; /* number of worklist items to be processed */
503 static int softdep_worklist_busy
; /* 1 => trying to do unmount */
504 static int softdep_worklist_req
; /* serialized waiters */
505 static int max_softdeps
; /* maximum number of structs before slowdown */
506 static int tickdelay
= 2; /* number of ticks to pause during slowdown */
507 static int *stat_countp
; /* statistic to count in proc_waiting timeout */
508 static int proc_waiting
; /* tracks whether we have a timeout posted */
509 static struct callout handle
; /* handle on posted proc_waiting timeout */
510 static struct thread
*filesys_syncer
; /* proc of filesystem syncer process */
511 static int req_clear_inodedeps
; /* syncer process flush some inodedeps */
512 #define FLUSH_INODES 1
513 static int req_clear_remove
; /* syncer process flush some freeblks */
514 #define FLUSH_REMOVE 2
518 static int stat_worklist_push
; /* number of worklist cleanups */
519 static int stat_blk_limit_push
; /* number of times block limit neared */
520 static int stat_ino_limit_push
; /* number of times inode limit neared */
521 static int stat_blk_limit_hit
; /* number of times block slowdown imposed */
522 static int stat_ino_limit_hit
; /* number of times inode slowdown imposed */
523 static int stat_sync_limit_hit
; /* number of synchronous slowdowns imposed */
524 static int stat_indir_blk_ptrs
; /* bufs redirtied as indir ptrs not written */
525 static int stat_inode_bitmap
; /* bufs redirtied as inode bitmap not written */
526 static int stat_direct_blk_ptrs
;/* bufs redirtied as direct ptrs not written */
527 static int stat_dir_entry
; /* bufs redirtied as dir entry cannot write */
530 #include <sys/sysctl.h>
531 SYSCTL_INT(_debug
, OID_AUTO
, max_softdeps
, CTLFLAG_RW
, &max_softdeps
, 0, "");
532 SYSCTL_INT(_debug
, OID_AUTO
, tickdelay
, CTLFLAG_RW
, &tickdelay
, 0, "");
533 SYSCTL_INT(_debug
, OID_AUTO
, worklist_push
, CTLFLAG_RW
, &stat_worklist_push
, 0,"");
534 SYSCTL_INT(_debug
, OID_AUTO
, blk_limit_push
, CTLFLAG_RW
, &stat_blk_limit_push
, 0,"");
535 SYSCTL_INT(_debug
, OID_AUTO
, ino_limit_push
, CTLFLAG_RW
, &stat_ino_limit_push
, 0,"");
536 SYSCTL_INT(_debug
, OID_AUTO
, blk_limit_hit
, CTLFLAG_RW
, &stat_blk_limit_hit
, 0, "");
537 SYSCTL_INT(_debug
, OID_AUTO
, ino_limit_hit
, CTLFLAG_RW
, &stat_ino_limit_hit
, 0, "");
538 SYSCTL_INT(_debug
, OID_AUTO
, sync_limit_hit
, CTLFLAG_RW
, &stat_sync_limit_hit
, 0, "");
539 SYSCTL_INT(_debug
, OID_AUTO
, indir_blk_ptrs
, CTLFLAG_RW
, &stat_indir_blk_ptrs
, 0, "");
540 SYSCTL_INT(_debug
, OID_AUTO
, inode_bitmap
, CTLFLAG_RW
, &stat_inode_bitmap
, 0, "");
541 SYSCTL_INT(_debug
, OID_AUTO
, direct_blk_ptrs
, CTLFLAG_RW
, &stat_direct_blk_ptrs
, 0, "");
542 SYSCTL_INT(_debug
, OID_AUTO
, dir_entry
, CTLFLAG_RW
, &stat_dir_entry
, 0, "");
546 * Add an item to the end of the work queue.
547 * This routine requires that the lock be held.
548 * This is the only routine that adds items to the list.
549 * The following routine is the only one that removes items
550 * and does so in order from first to last.
553 add_to_worklist(struct worklist
*wk
)
555 static struct worklist
*worklist_tail
;
557 if (wk
->wk_state
& ONWORKLIST
) {
558 if (lk
.lkt_held
!= NOHOLDER
)
560 panic("add_to_worklist: already on list");
562 wk
->wk_state
|= ONWORKLIST
;
563 if (LIST_FIRST(&softdep_workitem_pending
) == NULL
)
564 LIST_INSERT_HEAD(&softdep_workitem_pending
, wk
, wk_list
);
566 LIST_INSERT_AFTER(worklist_tail
, wk
, wk_list
);
568 num_on_worklist
+= 1;
572 * Process that runs once per second to handle items in the background queue.
574 * Note that we ensure that everything is done in the order in which they
575 * appear in the queue. The code below depends on this property to ensure
576 * that blocks of a file are freed before the inode itself is freed. This
577 * ordering ensures that no new <vfsid, inum, lbn> triples will be generated
578 * until all the old ones have been purged from the dependency lists.
581 softdep_process_worklist(struct mount
*matchmnt
)
583 thread_t td
= curthread
;
584 int matchcnt
, loopcount
;
588 * Record the process identifier of our caller so that we can give
589 * this process preferential treatment in request_cleanup below.
595 * There is no danger of having multiple processes run this
596 * code, but we have to single-thread it when softdep_flushfiles()
597 * is in operation to get an accurate count of the number of items
598 * related to its mount point that are in the list.
600 if (matchmnt
== NULL
) {
601 if (softdep_worklist_busy
< 0)
603 softdep_worklist_busy
+= 1;
607 * If requested, try removing inode or removal dependencies.
609 if (req_clear_inodedeps
) {
611 req_clear_inodedeps
-= 1;
612 wakeup_one(&proc_waiting
);
614 if (req_clear_remove
) {
616 req_clear_remove
-= 1;
617 wakeup_one(&proc_waiting
);
620 starttime
= time_second
;
621 while (num_on_worklist
> 0) {
622 matchcnt
+= process_worklist_item(matchmnt
, 0);
625 * If a umount operation wants to run the worklist
628 if (softdep_worklist_req
&& matchmnt
== NULL
) {
634 * If requested, try removing inode or removal dependencies.
636 if (req_clear_inodedeps
) {
638 req_clear_inodedeps
-= 1;
639 wakeup_one(&proc_waiting
);
641 if (req_clear_remove
) {
643 req_clear_remove
-= 1;
644 wakeup_one(&proc_waiting
);
647 * We do not generally want to stop for buffer space, but if
648 * we are really being a buffer hog, we will stop and wait.
650 if (loopcount
++ % 128 == 0)
653 * Never allow processing to run for more than one
654 * second. Otherwise the other syncer tasks may get
655 * excessively backlogged.
657 if (starttime
!= time_second
&& matchmnt
== NULL
) {
662 if (matchmnt
== NULL
) {
663 --softdep_worklist_busy
;
664 if (softdep_worklist_req
&& softdep_worklist_busy
== 0)
665 wakeup(&softdep_worklist_req
);
671 * Process one item on the worklist.
674 process_worklist_item(struct mount
*matchmnt
, int flags
)
677 struct dirrem
*dirrem
;
683 if (matchmnt
!= NULL
)
684 matchfs
= VFSTOUFS(matchmnt
)->um_fs
;
687 * Normally we just process each item on the worklist in order.
688 * However, if we are in a situation where we cannot lock any
689 * inodes, we have to skip over any dirrem requests whose
690 * vnodes are resident and locked.
692 LIST_FOREACH(wk
, &softdep_workitem_pending
, wk_list
) {
693 if ((flags
& LK_NOWAIT
) == 0 || wk
->wk_type
!= D_DIRREM
)
695 dirrem
= WK_DIRREM(wk
);
696 vp
= ufs_ihashlookup(VFSTOUFS(dirrem
->dm_mnt
)->um_dev
,
698 if (vp
== NULL
|| !vn_islocked(vp
))
706 num_on_worklist
-= 1;
708 switch (wk
->wk_type
) {
711 /* removal of a directory entry */
712 if (WK_DIRREM(wk
)->dm_mnt
== matchmnt
)
714 handle_workitem_remove(WK_DIRREM(wk
));
718 /* releasing blocks and/or fragments from a file */
719 if (WK_FREEBLKS(wk
)->fb_fs
== matchfs
)
721 handle_workitem_freeblocks(WK_FREEBLKS(wk
));
725 /* releasing a fragment when replaced as a file grows */
726 if (WK_FREEFRAG(wk
)->ff_fs
== matchfs
)
728 handle_workitem_freefrag(WK_FREEFRAG(wk
));
732 /* releasing an inode when its link count drops to 0 */
733 if (WK_FREEFILE(wk
)->fx_fs
== matchfs
)
735 handle_workitem_freefile(WK_FREEFILE(wk
));
739 panic("%s_process_worklist: Unknown type %s",
740 "softdep", TYPENAME(wk
->wk_type
));
747 * Move dependencies from one buffer to another.
750 softdep_move_dependencies(struct buf
*oldbp
, struct buf
*newbp
)
752 struct worklist
*wk
, *wktail
;
754 if (LIST_FIRST(&newbp
->b_dep
) != NULL
)
755 panic("softdep_move_dependencies: need merge code");
758 while ((wk
= LIST_FIRST(&oldbp
->b_dep
)) != NULL
) {
759 LIST_REMOVE(wk
, wk_list
);
761 LIST_INSERT_HEAD(&newbp
->b_dep
, wk
, wk_list
);
763 LIST_INSERT_AFTER(wktail
, wk
, wk_list
);
765 newbp
->b_ops
= &softdep_bioops
;
771 * Purge the work list of all items associated with a particular mount point.
774 softdep_flushfiles(struct mount
*oldmnt
, int flags
)
780 * Await our turn to clear out the queue, then serialize access.
782 while (softdep_worklist_busy
!= 0) {
783 softdep_worklist_req
+= 1;
784 tsleep(&softdep_worklist_req
, 0, "softflush", 0);
785 softdep_worklist_req
-= 1;
787 softdep_worklist_busy
= -1;
789 if ((error
= ffs_flushfiles(oldmnt
, flags
)) != 0) {
790 softdep_worklist_busy
= 0;
791 if (softdep_worklist_req
)
792 wakeup(&softdep_worklist_req
);
796 * Alternately flush the block device associated with the mount
797 * point and process any dependencies that the flushing
798 * creates. In theory, this loop can happen at most twice,
799 * but we give it a few extra just to be sure.
801 devvp
= VFSTOUFS(oldmnt
)->um_devvp
;
802 for (loopcnt
= 10; loopcnt
> 0; ) {
803 if (softdep_process_worklist(oldmnt
) == 0) {
806 * Do another flush in case any vnodes were brought in
807 * as part of the cleanup operations.
809 if ((error
= ffs_flushfiles(oldmnt
, flags
)) != 0)
812 * If we still found nothing to do, we are really done.
814 if (softdep_process_worklist(oldmnt
) == 0)
817 vn_lock(devvp
, LK_EXCLUSIVE
| LK_RETRY
);
818 error
= VOP_FSYNC(devvp
, MNT_WAIT
);
823 softdep_worklist_busy
= 0;
824 if (softdep_worklist_req
)
825 wakeup(&softdep_worklist_req
);
828 * If we are unmounting then it is an error to fail. If we
829 * are simply trying to downgrade to read-only, then filesystem
830 * activity can keep us busy forever, so we just fail with EBUSY.
833 if (oldmnt
->mnt_kern_flag
& MNTK_UNMOUNT
)
834 panic("softdep_flushfiles: looping");
843 * There are three types of structures that can be looked up:
844 * 1) pagedep structures identified by mount point, inode number,
846 * 2) inodedep structures identified by mount point and inode number.
847 * 3) newblk structures identified by mount point and
848 * physical block number.
850 * The "pagedep" and "inodedep" dependency structures are hashed
851 * separately from the file blocks and inodes to which they correspond.
852 * This separation helps when the in-memory copy of an inode or
853 * file block must be replaced. It also obviates the need to access
854 * an inode or file page when simply updating (or de-allocating)
855 * dependency structures. Lookup of newblk structures is needed to
856 * find newly allocated blocks when trying to associate them with
857 * their allocdirect or allocindir structure.
859 * The lookup routines optionally create and hash a new instance when
860 * an existing entry is not found.
862 #define DEPALLOC 0x0001 /* allocate structure if lookup fails */
863 #define NODELAY 0x0002 /* cannot do background work */
866 * Structures and routines associated with pagedep caching.
868 LIST_HEAD(pagedep_hashhead
, pagedep
) *pagedep_hashtbl
;
869 u_long pagedep_hash
; /* size of hash table - 1 */
870 #define PAGEDEP_HASH(mp, inum, lbn) \
871 (&pagedep_hashtbl[((((register_t)(mp)) >> 13) + (inum) + (lbn)) & \
873 static struct sema pagedep_in_progress
;
876 * Helper routine for pagedep_lookup()
880 pagedep_find(struct pagedep_hashhead
*pagedephd
, ino_t ino
, ufs_lbn_t lbn
,
883 struct pagedep
*pagedep
;
885 LIST_FOREACH(pagedep
, pagedephd
, pd_hash
) {
886 if (ino
== pagedep
->pd_ino
&&
887 lbn
== pagedep
->pd_lbn
&&
888 mp
== pagedep
->pd_mnt
) {
896 * Look up a pagedep. Return 1 if found, 0 if not found.
897 * If not found, allocate if DEPALLOC flag is passed.
898 * Found or allocated entry is returned in pagedeppp.
899 * This routine must be called with splbio interrupts blocked.
902 pagedep_lookup(struct inode
*ip
, ufs_lbn_t lbn
, int flags
,
903 struct pagedep
**pagedeppp
)
905 struct pagedep
*pagedep
;
906 struct pagedep_hashhead
*pagedephd
;
911 if (lk
.lkt_held
== NOHOLDER
)
912 panic("pagedep_lookup: lock not held");
914 mp
= ITOV(ip
)->v_mount
;
915 pagedephd
= PAGEDEP_HASH(mp
, ip
->i_number
, lbn
);
917 *pagedeppp
= pagedep_find(pagedephd
, ip
->i_number
, lbn
, mp
);
920 if ((flags
& DEPALLOC
) == 0)
922 if (sema_get(&pagedep_in_progress
, &lk
) == 0) {
926 MALLOC(pagedep
, struct pagedep
*, sizeof(struct pagedep
), M_PAGEDEP
,
927 M_SOFTDEP_FLAGS
| M_ZERO
);
929 if (pagedep_find(pagedephd
, ip
->i_number
, lbn
, mp
)) {
930 kprintf("pagedep_lookup: blocking race avoided\n");
932 sema_release(&pagedep_in_progress
);
933 kfree(pagedep
, M_PAGEDEP
);
937 pagedep
->pd_list
.wk_type
= D_PAGEDEP
;
938 pagedep
->pd_mnt
= mp
;
939 pagedep
->pd_ino
= ip
->i_number
;
940 pagedep
->pd_lbn
= lbn
;
941 LIST_INIT(&pagedep
->pd_dirremhd
);
942 LIST_INIT(&pagedep
->pd_pendinghd
);
943 for (i
= 0; i
< DAHASHSZ
; i
++)
944 LIST_INIT(&pagedep
->pd_diraddhd
[i
]);
946 LIST_INSERT_HEAD(pagedephd
, pagedep
, pd_hash
);
947 sema_release(&pagedep_in_progress
);
948 *pagedeppp
= pagedep
;
953 * Structures and routines associated with inodedep caching.
955 LIST_HEAD(inodedep_hashhead
, inodedep
) *inodedep_hashtbl
;
956 static u_long inodedep_hash
; /* size of hash table - 1 */
957 static long num_inodedep
; /* number of inodedep allocated */
958 #define INODEDEP_HASH(fs, inum) \
959 (&inodedep_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & inodedep_hash])
960 static struct sema inodedep_in_progress
;
963 * Helper routine for inodedep_lookup()
967 inodedep_find(struct inodedep_hashhead
*inodedephd
, struct fs
*fs
, ino_t inum
)
969 struct inodedep
*inodedep
;
971 LIST_FOREACH(inodedep
, inodedephd
, id_hash
) {
972 if (inum
== inodedep
->id_ino
&& fs
== inodedep
->id_fs
)
979 * Look up a inodedep. Return 1 if found, 0 if not found.
980 * If not found, allocate if DEPALLOC flag is passed.
981 * Found or allocated entry is returned in inodedeppp.
982 * This routine must be called with splbio interrupts blocked.
985 inodedep_lookup(struct fs
*fs
, ino_t inum
, int flags
,
986 struct inodedep
**inodedeppp
)
988 struct inodedep
*inodedep
;
989 struct inodedep_hashhead
*inodedephd
;
993 if (lk
.lkt_held
== NOHOLDER
)
994 panic("inodedep_lookup: lock not held");
997 inodedephd
= INODEDEP_HASH(fs
, inum
);
999 *inodedeppp
= inodedep_find(inodedephd
, fs
, inum
);
1002 if ((flags
& DEPALLOC
) == 0)
1005 * If we are over our limit, try to improve the situation.
1007 if (num_inodedep
> max_softdeps
&& firsttry
&&
1008 speedup_syncer() == 0 && (flags
& NODELAY
) == 0 &&
1009 request_cleanup(FLUSH_INODES
, 1)) {
1013 if (sema_get(&inodedep_in_progress
, &lk
) == 0) {
1017 MALLOC(inodedep
, struct inodedep
*, sizeof(struct inodedep
),
1018 M_INODEDEP
, M_SOFTDEP_FLAGS
| M_ZERO
);
1019 if (inodedep_find(inodedephd
, fs
, inum
)) {
1020 kprintf("inodedep_lookup: blocking race avoided\n");
1022 sema_release(&inodedep_in_progress
);
1023 kfree(inodedep
, M_INODEDEP
);
1026 inodedep
->id_list
.wk_type
= D_INODEDEP
;
1027 inodedep
->id_fs
= fs
;
1028 inodedep
->id_ino
= inum
;
1029 inodedep
->id_state
= ALLCOMPLETE
;
1030 inodedep
->id_nlinkdelta
= 0;
1031 inodedep
->id_savedino
= NULL
;
1032 inodedep
->id_savedsize
= -1;
1033 inodedep
->id_buf
= NULL
;
1034 LIST_INIT(&inodedep
->id_pendinghd
);
1035 LIST_INIT(&inodedep
->id_inowait
);
1036 LIST_INIT(&inodedep
->id_bufwait
);
1037 TAILQ_INIT(&inodedep
->id_inoupdt
);
1038 TAILQ_INIT(&inodedep
->id_newinoupdt
);
1041 LIST_INSERT_HEAD(inodedephd
, inodedep
, id_hash
);
1042 sema_release(&inodedep_in_progress
);
1043 *inodedeppp
= inodedep
;
1048 * Structures and routines associated with newblk caching.
1050 LIST_HEAD(newblk_hashhead
, newblk
) *newblk_hashtbl
;
1051 u_long newblk_hash
; /* size of hash table - 1 */
1052 #define NEWBLK_HASH(fs, inum) \
1053 (&newblk_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & newblk_hash])
1054 static struct sema newblk_in_progress
;
1057 * Helper routine for newblk_lookup()
1061 newblk_find(struct newblk_hashhead
*newblkhd
, struct fs
*fs
,
1062 ufs_daddr_t newblkno
)
1064 struct newblk
*newblk
;
1066 LIST_FOREACH(newblk
, newblkhd
, nb_hash
) {
1067 if (newblkno
== newblk
->nb_newblkno
&& fs
== newblk
->nb_fs
)
1074 * Look up a newblk. Return 1 if found, 0 if not found.
1075 * If not found, allocate if DEPALLOC flag is passed.
1076 * Found or allocated entry is returned in newblkpp.
1079 newblk_lookup(struct fs
*fs
, ufs_daddr_t newblkno
, int flags
,
1080 struct newblk
**newblkpp
)
1082 struct newblk
*newblk
;
1083 struct newblk_hashhead
*newblkhd
;
1085 newblkhd
= NEWBLK_HASH(fs
, newblkno
);
1087 *newblkpp
= newblk_find(newblkhd
, fs
, newblkno
);
1090 if ((flags
& DEPALLOC
) == 0)
1092 if (sema_get(&newblk_in_progress
, 0) == 0)
1094 MALLOC(newblk
, struct newblk
*, sizeof(struct newblk
),
1095 M_NEWBLK
, M_SOFTDEP_FLAGS
| M_ZERO
);
1097 if (newblk_find(newblkhd
, fs
, newblkno
)) {
1098 kprintf("newblk_lookup: blocking race avoided\n");
1099 sema_release(&pagedep_in_progress
);
1100 kfree(newblk
, M_NEWBLK
);
1103 newblk
->nb_state
= 0;
1105 newblk
->nb_newblkno
= newblkno
;
1106 LIST_INSERT_HEAD(newblkhd
, newblk
, nb_hash
);
1107 sema_release(&newblk_in_progress
);
1113 * Executed during filesystem system initialization before
1114 * mounting any filesystems.
1117 softdep_initialize(void)
1119 callout_init(&handle
);
1121 LIST_INIT(&mkdirlisthd
);
1122 LIST_INIT(&softdep_workitem_pending
);
1123 max_softdeps
= min(desiredvnodes
* 8,
1124 M_INODEDEP
->ks_limit
/ (2 * sizeof(struct inodedep
)));
1125 pagedep_hashtbl
= hashinit(desiredvnodes
/ 5, M_PAGEDEP
,
1127 sema_init(&pagedep_in_progress
, "pagedep", 0, 0);
1128 inodedep_hashtbl
= hashinit(desiredvnodes
, M_INODEDEP
, &inodedep_hash
);
1129 sema_init(&inodedep_in_progress
, "inodedep", 0, 0);
1130 newblk_hashtbl
= hashinit(64, M_NEWBLK
, &newblk_hash
);
1131 sema_init(&newblk_in_progress
, "newblk", 0, 0);
1132 add_bio_ops(&softdep_bioops
);
1136 * Called at mount time to notify the dependency code that a
1137 * filesystem wishes to use it.
1140 softdep_mount(struct vnode
*devvp
, struct mount
*mp
, struct fs
*fs
)
1142 struct csum cstotal
;
1147 mp
->mnt_flag
&= ~MNT_ASYNC
;
1148 mp
->mnt_flag
|= MNT_SOFTDEP
;
1149 mp
->mnt_bioops
= &softdep_bioops
;
1151 * When doing soft updates, the counters in the
1152 * superblock may have gotten out of sync, so we have
1153 * to scan the cylinder groups and recalculate them.
1155 if (fs
->fs_clean
!= 0)
1157 bzero(&cstotal
, sizeof cstotal
);
1158 for (cyl
= 0; cyl
< fs
->fs_ncg
; cyl
++) {
1159 if ((error
= bread(devvp
, fsbtodoff(fs
, cgtod(fs
, cyl
)),
1160 fs
->fs_cgsize
, &bp
)) != 0) {
1164 cgp
= (struct cg
*)bp
->b_data
;
1165 cstotal
.cs_nffree
+= cgp
->cg_cs
.cs_nffree
;
1166 cstotal
.cs_nbfree
+= cgp
->cg_cs
.cs_nbfree
;
1167 cstotal
.cs_nifree
+= cgp
->cg_cs
.cs_nifree
;
1168 cstotal
.cs_ndir
+= cgp
->cg_cs
.cs_ndir
;
1169 fs
->fs_cs(fs
, cyl
) = cgp
->cg_cs
;
1173 if (bcmp(&cstotal
, &fs
->fs_cstotal
, sizeof cstotal
))
1174 kprintf("ffs_mountfs: superblock updated for soft updates\n");
1176 bcopy(&cstotal
, &fs
->fs_cstotal
, sizeof cstotal
);
1181 * Protecting the freemaps (or bitmaps).
1183 * To eliminate the need to execute fsck before mounting a filesystem
1184 * after a power failure, one must (conservatively) guarantee that the
1185 * on-disk copy of the bitmaps never indicate that a live inode or block is
1186 * free. So, when a block or inode is allocated, the bitmap should be
1187 * updated (on disk) before any new pointers. When a block or inode is
1188 * freed, the bitmap should not be updated until all pointers have been
1189 * reset. The latter dependency is handled by the delayed de-allocation
1190 * approach described below for block and inode de-allocation. The former
1191 * dependency is handled by calling the following procedure when a block or
1192 * inode is allocated. When an inode is allocated an "inodedep" is created
1193 * with its DEPCOMPLETE flag cleared until its bitmap is written to disk.
1194 * Each "inodedep" is also inserted into the hash indexing structure so
1195 * that any additional link additions can be made dependent on the inode
1198 * The ufs filesystem maintains a number of free block counts (e.g., per
1199 * cylinder group, per cylinder and per <cylinder, rotational position> pair)
1200 * in addition to the bitmaps. These counts are used to improve efficiency
1201 * during allocation and therefore must be consistent with the bitmaps.
1202 * There is no convenient way to guarantee post-crash consistency of these
1203 * counts with simple update ordering, for two main reasons: (1) The counts
1204 * and bitmaps for a single cylinder group block are not in the same disk
1205 * sector. If a disk write is interrupted (e.g., by power failure), one may
1206 * be written and the other not. (2) Some of the counts are located in the
1207 * superblock rather than the cylinder group block. So, we focus our soft
1208 * updates implementation on protecting the bitmaps. When mounting a
1209 * filesystem, we recompute the auxiliary counts from the bitmaps.
1213 * Called just after updating the cylinder group block to allocate an inode.
1216 * bp: buffer for cylgroup block with inode map
1217 * ip: inode related to allocation
1218 * newinum: new inode number being allocated
1221 softdep_setup_inomapdep(struct buf
*bp
, struct inode
*ip
, ino_t newinum
)
1223 struct inodedep
*inodedep
;
1224 struct bmsafemap
*bmsafemap
;
1227 * Create a dependency for the newly allocated inode.
1228 * Panic if it already exists as something is seriously wrong.
1229 * Otherwise add it to the dependency list for the buffer holding
1230 * the cylinder group map from which it was allocated.
1233 if ((inodedep_lookup(ip
->i_fs
, newinum
, DEPALLOC
|NODELAY
, &inodedep
))) {
1235 panic("softdep_setup_inomapdep: found inode");
1237 inodedep
->id_buf
= bp
;
1238 inodedep
->id_state
&= ~DEPCOMPLETE
;
1239 bmsafemap
= bmsafemap_lookup(bp
);
1240 LIST_INSERT_HEAD(&bmsafemap
->sm_inodedephd
, inodedep
, id_deps
);
1245 * Called just after updating the cylinder group block to
1246 * allocate block or fragment.
1249 * bp: buffer for cylgroup block with block map
1250 * fs: filesystem doing allocation
1251 * newblkno: number of newly allocated block
1254 softdep_setup_blkmapdep(struct buf
*bp
, struct fs
*fs
,
1255 ufs_daddr_t newblkno
)
1257 struct newblk
*newblk
;
1258 struct bmsafemap
*bmsafemap
;
1261 * Create a dependency for the newly allocated block.
1262 * Add it to the dependency list for the buffer holding
1263 * the cylinder group map from which it was allocated.
1265 if (newblk_lookup(fs
, newblkno
, DEPALLOC
, &newblk
) != 0)
1266 panic("softdep_setup_blkmapdep: found block");
1268 newblk
->nb_bmsafemap
= bmsafemap
= bmsafemap_lookup(bp
);
1269 LIST_INSERT_HEAD(&bmsafemap
->sm_newblkhd
, newblk
, nb_deps
);
1274 * Find the bmsafemap associated with a cylinder group buffer.
1275 * If none exists, create one. The buffer must be locked when
1276 * this routine is called and this routine must be called with
1277 * splbio interrupts blocked.
1279 static struct bmsafemap
*
1280 bmsafemap_lookup(struct buf
*bp
)
1282 struct bmsafemap
*bmsafemap
;
1283 struct worklist
*wk
;
1286 if (lk
.lkt_held
== NOHOLDER
)
1287 panic("bmsafemap_lookup: lock not held");
1289 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
1290 if (wk
->wk_type
== D_BMSAFEMAP
)
1291 return (WK_BMSAFEMAP(wk
));
1294 MALLOC(bmsafemap
, struct bmsafemap
*, sizeof(struct bmsafemap
),
1295 M_BMSAFEMAP
, M_SOFTDEP_FLAGS
);
1296 bmsafemap
->sm_list
.wk_type
= D_BMSAFEMAP
;
1297 bmsafemap
->sm_list
.wk_state
= 0;
1298 bmsafemap
->sm_buf
= bp
;
1299 LIST_INIT(&bmsafemap
->sm_allocdirecthd
);
1300 LIST_INIT(&bmsafemap
->sm_allocindirhd
);
1301 LIST_INIT(&bmsafemap
->sm_inodedephd
);
1302 LIST_INIT(&bmsafemap
->sm_newblkhd
);
1304 WORKLIST_INSERT_BP(bp
, &bmsafemap
->sm_list
);
1309 * Direct block allocation dependencies.
1311 * When a new block is allocated, the corresponding disk locations must be
1312 * initialized (with zeros or new data) before the on-disk inode points to
1313 * them. Also, the freemap from which the block was allocated must be
1314 * updated (on disk) before the inode's pointer. These two dependencies are
1315 * independent of each other and are needed for all file blocks and indirect
1316 * blocks that are pointed to directly by the inode. Just before the
1317 * "in-core" version of the inode is updated with a newly allocated block
1318 * number, a procedure (below) is called to setup allocation dependency
1319 * structures. These structures are removed when the corresponding
1320 * dependencies are satisfied or when the block allocation becomes obsolete
1321 * (i.e., the file is deleted, the block is de-allocated, or the block is a
1322 * fragment that gets upgraded). All of these cases are handled in
1323 * procedures described later.
1325 * When a file extension causes a fragment to be upgraded, either to a larger
1326 * fragment or to a full block, the on-disk location may change (if the
1327 * previous fragment could not simply be extended). In this case, the old
1328 * fragment must be de-allocated, but not until after the inode's pointer has
1329 * been updated. In most cases, this is handled by later procedures, which
1330 * will construct a "freefrag" structure to be added to the workitem queue
1331 * when the inode update is complete (or obsolete). The main exception to
1332 * this is when an allocation occurs while a pending allocation dependency
1333 * (for the same block pointer) remains. This case is handled in the main
1334 * allocation dependency setup procedure by immediately freeing the
1335 * unreferenced fragments.
1338 * ip: inode to which block is being added
1339 * lbn: block pointer within inode
1340 * newblkno: disk block number being added
1341 * oldblkno: previous block number, 0 unless frag
1342 * newsize: size of new block
1343 * oldsize: size of new block
1344 * bp: bp for allocated block
1347 softdep_setup_allocdirect(struct inode
*ip
, ufs_lbn_t lbn
, ufs_daddr_t newblkno
,
1348 ufs_daddr_t oldblkno
, long newsize
, long oldsize
,
1351 struct allocdirect
*adp
, *oldadp
;
1352 struct allocdirectlst
*adphead
;
1353 struct bmsafemap
*bmsafemap
;
1354 struct inodedep
*inodedep
;
1355 struct pagedep
*pagedep
;
1356 struct newblk
*newblk
;
1358 MALLOC(adp
, struct allocdirect
*, sizeof(struct allocdirect
),
1359 M_ALLOCDIRECT
, M_SOFTDEP_FLAGS
| M_ZERO
);
1360 adp
->ad_list
.wk_type
= D_ALLOCDIRECT
;
1362 adp
->ad_newblkno
= newblkno
;
1363 adp
->ad_oldblkno
= oldblkno
;
1364 adp
->ad_newsize
= newsize
;
1365 adp
->ad_oldsize
= oldsize
;
1366 adp
->ad_state
= ATTACHED
;
1367 if (newblkno
== oldblkno
)
1368 adp
->ad_freefrag
= NULL
;
1370 adp
->ad_freefrag
= newfreefrag(ip
, oldblkno
, oldsize
);
1372 if (newblk_lookup(ip
->i_fs
, newblkno
, 0, &newblk
) == 0)
1373 panic("softdep_setup_allocdirect: lost block");
1376 inodedep_lookup(ip
->i_fs
, ip
->i_number
, DEPALLOC
| NODELAY
, &inodedep
);
1377 adp
->ad_inodedep
= inodedep
;
1379 if (newblk
->nb_state
== DEPCOMPLETE
) {
1380 adp
->ad_state
|= DEPCOMPLETE
;
1383 bmsafemap
= newblk
->nb_bmsafemap
;
1384 adp
->ad_buf
= bmsafemap
->sm_buf
;
1385 LIST_REMOVE(newblk
, nb_deps
);
1386 LIST_INSERT_HEAD(&bmsafemap
->sm_allocdirecthd
, adp
, ad_deps
);
1388 LIST_REMOVE(newblk
, nb_hash
);
1389 FREE(newblk
, M_NEWBLK
);
1391 WORKLIST_INSERT_BP(bp
, &adp
->ad_list
);
1392 if (lbn
>= NDADDR
) {
1393 /* allocating an indirect block */
1394 if (oldblkno
!= 0) {
1396 panic("softdep_setup_allocdirect: non-zero indir");
1400 * Allocating a direct block.
1402 * If we are allocating a directory block, then we must
1403 * allocate an associated pagedep to track additions and
1406 if ((ip
->i_mode
& IFMT
) == IFDIR
&&
1407 pagedep_lookup(ip
, lbn
, DEPALLOC
, &pagedep
) == 0) {
1408 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
1412 * The list of allocdirects must be kept in sorted and ascending
1413 * order so that the rollback routines can quickly determine the
1414 * first uncommitted block (the size of the file stored on disk
1415 * ends at the end of the lowest committed fragment, or if there
1416 * are no fragments, at the end of the highest committed block).
1417 * Since files generally grow, the typical case is that the new
1418 * block is to be added at the end of the list. We speed this
1419 * special case by checking against the last allocdirect in the
1420 * list before laboriously traversing the list looking for the
1423 adphead
= &inodedep
->id_newinoupdt
;
1424 oldadp
= TAILQ_LAST(adphead
, allocdirectlst
);
1425 if (oldadp
== NULL
|| oldadp
->ad_lbn
<= lbn
) {
1426 /* insert at end of list */
1427 TAILQ_INSERT_TAIL(adphead
, adp
, ad_next
);
1428 if (oldadp
!= NULL
&& oldadp
->ad_lbn
== lbn
)
1429 allocdirect_merge(adphead
, adp
, oldadp
);
1433 TAILQ_FOREACH(oldadp
, adphead
, ad_next
) {
1434 if (oldadp
->ad_lbn
>= lbn
)
1437 if (oldadp
== NULL
) {
1439 panic("softdep_setup_allocdirect: lost entry");
1441 /* insert in middle of list */
1442 TAILQ_INSERT_BEFORE(oldadp
, adp
, ad_next
);
1443 if (oldadp
->ad_lbn
== lbn
)
1444 allocdirect_merge(adphead
, adp
, oldadp
);
1449 * Replace an old allocdirect dependency with a newer one.
1450 * This routine must be called with splbio interrupts blocked.
1453 * adphead: head of list holding allocdirects
1454 * newadp: allocdirect being added
1455 * oldadp: existing allocdirect being checked
1458 allocdirect_merge(struct allocdirectlst
*adphead
,
1459 struct allocdirect
*newadp
,
1460 struct allocdirect
*oldadp
)
1462 struct freefrag
*freefrag
;
1465 if (lk
.lkt_held
== NOHOLDER
)
1466 panic("allocdirect_merge: lock not held");
1468 if (newadp
->ad_oldblkno
!= oldadp
->ad_newblkno
||
1469 newadp
->ad_oldsize
!= oldadp
->ad_newsize
||
1470 newadp
->ad_lbn
>= NDADDR
) {
1472 panic("allocdirect_check: old %d != new %d || lbn %ld >= %d",
1473 newadp
->ad_oldblkno
, oldadp
->ad_newblkno
, newadp
->ad_lbn
,
1476 newadp
->ad_oldblkno
= oldadp
->ad_oldblkno
;
1477 newadp
->ad_oldsize
= oldadp
->ad_oldsize
;
1479 * If the old dependency had a fragment to free or had never
1480 * previously had a block allocated, then the new dependency
1481 * can immediately post its freefrag and adopt the old freefrag.
1482 * This action is done by swapping the freefrag dependencies.
1483 * The new dependency gains the old one's freefrag, and the
1484 * old one gets the new one and then immediately puts it on
1485 * the worklist when it is freed by free_allocdirect. It is
1486 * not possible to do this swap when the old dependency had a
1487 * non-zero size but no previous fragment to free. This condition
1488 * arises when the new block is an extension of the old block.
1489 * Here, the first part of the fragment allocated to the new
1490 * dependency is part of the block currently claimed on disk by
1491 * the old dependency, so cannot legitimately be freed until the
1492 * conditions for the new dependency are fulfilled.
1494 if (oldadp
->ad_freefrag
!= NULL
|| oldadp
->ad_oldblkno
== 0) {
1495 freefrag
= newadp
->ad_freefrag
;
1496 newadp
->ad_freefrag
= oldadp
->ad_freefrag
;
1497 oldadp
->ad_freefrag
= freefrag
;
1499 free_allocdirect(adphead
, oldadp
, 0);
1503 * Allocate a new freefrag structure if needed.
1505 static struct freefrag
*
1506 newfreefrag(struct inode
*ip
, ufs_daddr_t blkno
, long size
)
1508 struct freefrag
*freefrag
;
1514 if (fragnum(fs
, blkno
) + numfrags(fs
, size
) > fs
->fs_frag
)
1515 panic("newfreefrag: frag size");
1516 MALLOC(freefrag
, struct freefrag
*, sizeof(struct freefrag
),
1517 M_FREEFRAG
, M_SOFTDEP_FLAGS
);
1518 freefrag
->ff_list
.wk_type
= D_FREEFRAG
;
1519 freefrag
->ff_state
= ip
->i_uid
& ~ONWORKLIST
; /* XXX - used below */
1520 freefrag
->ff_inum
= ip
->i_number
;
1521 freefrag
->ff_fs
= fs
;
1522 freefrag
->ff_devvp
= ip
->i_devvp
;
1523 freefrag
->ff_blkno
= blkno
;
1524 freefrag
->ff_fragsize
= size
;
1529 * This workitem de-allocates fragments that were replaced during
1530 * file block allocation.
1533 handle_workitem_freefrag(struct freefrag
*freefrag
)
1537 tip
.i_fs
= freefrag
->ff_fs
;
1538 tip
.i_devvp
= freefrag
->ff_devvp
;
1539 tip
.i_dev
= freefrag
->ff_devvp
->v_rdev
;
1540 tip
.i_number
= freefrag
->ff_inum
;
1541 tip
.i_uid
= freefrag
->ff_state
& ~ONWORKLIST
; /* XXX - set above */
1542 ffs_blkfree(&tip
, freefrag
->ff_blkno
, freefrag
->ff_fragsize
);
1543 FREE(freefrag
, M_FREEFRAG
);
1547 * Indirect block allocation dependencies.
1549 * The same dependencies that exist for a direct block also exist when
1550 * a new block is allocated and pointed to by an entry in a block of
1551 * indirect pointers. The undo/redo states described above are also
1552 * used here. Because an indirect block contains many pointers that
1553 * may have dependencies, a second copy of the entire in-memory indirect
1554 * block is kept. The buffer cache copy is always completely up-to-date.
1555 * The second copy, which is used only as a source for disk writes,
1556 * contains only the safe pointers (i.e., those that have no remaining
1557 * update dependencies). The second copy is freed when all pointers
1558 * are safe. The cache is not allowed to replace indirect blocks with
1559 * pending update dependencies. If a buffer containing an indirect
1560 * block with dependencies is written, these routines will mark it
1561 * dirty again. It can only be successfully written once all the
1562 * dependencies are removed. The ffs_fsync routine in conjunction with
1563 * softdep_sync_metadata work together to get all the dependencies
1564 * removed so that a file can be successfully written to disk. Three
1565 * procedures are used when setting up indirect block pointer
1566 * dependencies. The division is necessary because of the organization
1567 * of the "balloc" routine and because of the distinction between file
1568 * pages and file metadata blocks.
1572 * Allocate a new allocindir structure.
1575 * ip: inode for file being extended
1576 * ptrno: offset of pointer in indirect block
1577 * newblkno: disk block number being added
1578 * oldblkno: previous block number, 0 if none
1580 static struct allocindir
*
1581 newallocindir(struct inode
*ip
, int ptrno
, ufs_daddr_t newblkno
,
1582 ufs_daddr_t oldblkno
)
1584 struct allocindir
*aip
;
1586 MALLOC(aip
, struct allocindir
*, sizeof(struct allocindir
),
1587 M_ALLOCINDIR
, M_SOFTDEP_FLAGS
| M_ZERO
);
1588 aip
->ai_list
.wk_type
= D_ALLOCINDIR
;
1589 aip
->ai_state
= ATTACHED
;
1590 aip
->ai_offset
= ptrno
;
1591 aip
->ai_newblkno
= newblkno
;
1592 aip
->ai_oldblkno
= oldblkno
;
1593 aip
->ai_freefrag
= newfreefrag(ip
, oldblkno
, ip
->i_fs
->fs_bsize
);
1598 * Called just before setting an indirect block pointer
1599 * to a newly allocated file page.
1602 * ip: inode for file being extended
1603 * lbn: allocated block number within file
1604 * bp: buffer with indirect blk referencing page
1605 * ptrno: offset of pointer in indirect block
1606 * newblkno: disk block number being added
1607 * oldblkno: previous block number, 0 if none
1608 * nbp: buffer holding allocated page
1611 softdep_setup_allocindir_page(struct inode
*ip
, ufs_lbn_t lbn
,
1612 struct buf
*bp
, int ptrno
,
1613 ufs_daddr_t newblkno
, ufs_daddr_t oldblkno
,
1616 struct allocindir
*aip
;
1617 struct pagedep
*pagedep
;
1619 aip
= newallocindir(ip
, ptrno
, newblkno
, oldblkno
);
1622 * If we are allocating a directory page, then we must
1623 * allocate an associated pagedep to track additions and
1626 if ((ip
->i_mode
& IFMT
) == IFDIR
&&
1627 pagedep_lookup(ip
, lbn
, DEPALLOC
, &pagedep
) == 0)
1628 WORKLIST_INSERT_BP(nbp
, &pagedep
->pd_list
);
1629 WORKLIST_INSERT_BP(nbp
, &aip
->ai_list
);
1631 setup_allocindir_phase2(bp
, ip
, aip
);
1635 * Called just before setting an indirect block pointer to a
1636 * newly allocated indirect block.
1638 * nbp: newly allocated indirect block
1639 * ip: inode for file being extended
1640 * bp: indirect block referencing allocated block
1641 * ptrno: offset of pointer in indirect block
1642 * newblkno: disk block number being added
1645 softdep_setup_allocindir_meta(struct buf
*nbp
, struct inode
*ip
,
1646 struct buf
*bp
, int ptrno
,
1647 ufs_daddr_t newblkno
)
1649 struct allocindir
*aip
;
1651 aip
= newallocindir(ip
, ptrno
, newblkno
, 0);
1653 WORKLIST_INSERT_BP(nbp
, &aip
->ai_list
);
1655 setup_allocindir_phase2(bp
, ip
, aip
);
1659 * Called to finish the allocation of the "aip" allocated
1660 * by one of the two routines above.
1663 * bp: in-memory copy of the indirect block
1664 * ip: inode for file being extended
1665 * aip: allocindir allocated by the above routines
1668 setup_allocindir_phase2(struct buf
*bp
, struct inode
*ip
,
1669 struct allocindir
*aip
)
1671 struct worklist
*wk
;
1672 struct indirdep
*indirdep
, *newindirdep
;
1673 struct bmsafemap
*bmsafemap
;
1674 struct allocindir
*oldaip
;
1675 struct freefrag
*freefrag
;
1676 struct newblk
*newblk
;
1678 if (bp
->b_loffset
>= 0)
1679 panic("setup_allocindir_phase2: not indir blk");
1680 for (indirdep
= NULL
, newindirdep
= NULL
; ; ) {
1682 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
1683 if (wk
->wk_type
!= D_INDIRDEP
)
1685 indirdep
= WK_INDIRDEP(wk
);
1688 if (indirdep
== NULL
&& newindirdep
) {
1689 indirdep
= newindirdep
;
1690 WORKLIST_INSERT_BP(bp
, &indirdep
->ir_list
);
1695 if (newblk_lookup(ip
->i_fs
, aip
->ai_newblkno
, 0,
1697 panic("setup_allocindir: lost block");
1699 if (newblk
->nb_state
== DEPCOMPLETE
) {
1700 aip
->ai_state
|= DEPCOMPLETE
;
1703 bmsafemap
= newblk
->nb_bmsafemap
;
1704 aip
->ai_buf
= bmsafemap
->sm_buf
;
1705 LIST_REMOVE(newblk
, nb_deps
);
1706 LIST_INSERT_HEAD(&bmsafemap
->sm_allocindirhd
,
1709 LIST_REMOVE(newblk
, nb_hash
);
1710 FREE(newblk
, M_NEWBLK
);
1711 aip
->ai_indirdep
= indirdep
;
1713 * Check to see if there is an existing dependency
1714 * for this block. If there is, merge the old
1715 * dependency into the new one.
1717 if (aip
->ai_oldblkno
== 0)
1721 LIST_FOREACH(oldaip
, &indirdep
->ir_deplisthd
, ai_next
)
1722 if (oldaip
->ai_offset
== aip
->ai_offset
)
1724 if (oldaip
!= NULL
) {
1725 if (oldaip
->ai_newblkno
!= aip
->ai_oldblkno
) {
1727 panic("setup_allocindir_phase2: blkno");
1729 aip
->ai_oldblkno
= oldaip
->ai_oldblkno
;
1730 freefrag
= oldaip
->ai_freefrag
;
1731 oldaip
->ai_freefrag
= aip
->ai_freefrag
;
1732 aip
->ai_freefrag
= freefrag
;
1733 free_allocindir(oldaip
, NULL
);
1735 LIST_INSERT_HEAD(&indirdep
->ir_deplisthd
, aip
, ai_next
);
1736 ((ufs_daddr_t
*)indirdep
->ir_savebp
->b_data
)
1737 [aip
->ai_offset
] = aip
->ai_oldblkno
;
1742 * Avoid any possibility of data corruption by
1743 * ensuring that our old version is thrown away.
1745 newindirdep
->ir_savebp
->b_flags
|= B_INVAL
| B_NOCACHE
;
1746 brelse(newindirdep
->ir_savebp
);
1747 WORKITEM_FREE((caddr_t
)newindirdep
, D_INDIRDEP
);
1751 MALLOC(newindirdep
, struct indirdep
*, sizeof(struct indirdep
),
1752 M_INDIRDEP
, M_SOFTDEP_FLAGS
);
1753 newindirdep
->ir_list
.wk_type
= D_INDIRDEP
;
1754 newindirdep
->ir_state
= ATTACHED
;
1755 LIST_INIT(&newindirdep
->ir_deplisthd
);
1756 LIST_INIT(&newindirdep
->ir_donehd
);
1757 if (bp
->b_bio2
.bio_offset
== NOOFFSET
) {
1758 VOP_BMAP(bp
->b_vp
, bp
->b_bio1
.bio_offset
,
1759 &bp
->b_bio2
.bio_offset
, NULL
, NULL
,
1762 KKASSERT(bp
->b_bio2
.bio_offset
!= NOOFFSET
);
1763 newindirdep
->ir_savebp
= getblk(ip
->i_devvp
,
1764 bp
->b_bio2
.bio_offset
,
1765 bp
->b_bcount
, 0, 0);
1766 BUF_KERNPROC(newindirdep
->ir_savebp
);
1767 bcopy(bp
->b_data
, newindirdep
->ir_savebp
->b_data
, bp
->b_bcount
);
1772 * Block de-allocation dependencies.
1774 * When blocks are de-allocated, the on-disk pointers must be nullified before
1775 * the blocks are made available for use by other files. (The true
1776 * requirement is that old pointers must be nullified before new on-disk
1777 * pointers are set. We chose this slightly more stringent requirement to
1778 * reduce complexity.) Our implementation handles this dependency by updating
1779 * the inode (or indirect block) appropriately but delaying the actual block
1780 * de-allocation (i.e., freemap and free space count manipulation) until
1781 * after the updated versions reach stable storage. After the disk is
1782 * updated, the blocks can be safely de-allocated whenever it is convenient.
1783 * This implementation handles only the common case of reducing a file's
1784 * length to zero. Other cases are handled by the conventional synchronous
1787 * The ffs implementation with which we worked double-checks
1788 * the state of the block pointers and file size as it reduces
1789 * a file's length. Some of this code is replicated here in our
1790 * soft updates implementation. The freeblks->fb_chkcnt field is
1791 * used to transfer a part of this information to the procedure
1792 * that eventually de-allocates the blocks.
1794 * This routine should be called from the routine that shortens
1795 * a file's length, before the inode's size or block pointers
1796 * are modified. It will save the block pointer information for
1797 * later release and zero the inode so that the calling routine
1800 struct softdep_setup_freeblocks_info
{
1805 static int softdep_setup_freeblocks_bp(struct buf
*bp
, void *data
);
1809 * ip: The inode whose length is to be reduced
1810 * length: The new length for the file
1813 softdep_setup_freeblocks(struct inode
*ip
, off_t length
)
1815 struct softdep_setup_freeblocks_info info
;
1816 struct freeblks
*freeblks
;
1817 struct inodedep
*inodedep
;
1818 struct allocdirect
*adp
;
1822 int i
, error
, delay
;
1827 panic("softde_setup_freeblocks: non-zero length");
1828 MALLOC(freeblks
, struct freeblks
*, sizeof(struct freeblks
),
1829 M_FREEBLKS
, M_SOFTDEP_FLAGS
| M_ZERO
);
1830 freeblks
->fb_list
.wk_type
= D_FREEBLKS
;
1831 freeblks
->fb_state
= ATTACHED
;
1832 freeblks
->fb_uid
= ip
->i_uid
;
1833 freeblks
->fb_previousinum
= ip
->i_number
;
1834 freeblks
->fb_devvp
= ip
->i_devvp
;
1835 freeblks
->fb_fs
= fs
;
1836 freeblks
->fb_oldsize
= ip
->i_size
;
1837 freeblks
->fb_newsize
= length
;
1838 freeblks
->fb_chkcnt
= ip
->i_blocks
;
1839 for (i
= 0; i
< NDADDR
; i
++) {
1840 freeblks
->fb_dblks
[i
] = ip
->i_db
[i
];
1843 for (i
= 0; i
< NIADDR
; i
++) {
1844 freeblks
->fb_iblks
[i
] = ip
->i_ib
[i
];
1850 * Push the zero'ed inode to to its disk buffer so that we are free
1851 * to delete its dependencies below. Once the dependencies are gone
1852 * the buffer can be safely released.
1854 if ((error
= bread(ip
->i_devvp
,
1855 fsbtodoff(fs
, ino_to_fsba(fs
, ip
->i_number
)),
1856 (int)fs
->fs_bsize
, &bp
)) != 0)
1857 softdep_error("softdep_setup_freeblocks", error
);
1858 *((struct ufs1_dinode
*)bp
->b_data
+ ino_to_fsbo(fs
, ip
->i_number
)) =
1861 * Find and eliminate any inode dependencies.
1864 (void) inodedep_lookup(fs
, ip
->i_number
, DEPALLOC
, &inodedep
);
1865 if ((inodedep
->id_state
& IOSTARTED
) != 0) {
1867 panic("softdep_setup_freeblocks: inode busy");
1870 * Add the freeblks structure to the list of operations that
1871 * must await the zero'ed inode being written to disk. If we
1872 * still have a bitmap dependency (delay == 0), then the inode
1873 * has never been written to disk, so we can process the
1874 * freeblks below once we have deleted the dependencies.
1876 delay
= (inodedep
->id_state
& DEPCOMPLETE
);
1878 WORKLIST_INSERT(&inodedep
->id_bufwait
, &freeblks
->fb_list
);
1880 * Because the file length has been truncated to zero, any
1881 * pending block allocation dependency structures associated
1882 * with this inode are obsolete and can simply be de-allocated.
1883 * We must first merge the two dependency lists to get rid of
1884 * any duplicate freefrag structures, then purge the merged list.
1886 merge_inode_lists(inodedep
);
1887 while ((adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
)) != 0)
1888 free_allocdirect(&inodedep
->id_inoupdt
, adp
, 1);
1892 * We must wait for any I/O in progress to finish so that
1893 * all potential buffers on the dirty list will be visible.
1894 * Once they are all there, walk the list and get rid of
1899 drain_output(vp
, 1);
1904 count
= RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
1905 softdep_setup_freeblocks_bp
, &info
);
1906 } while (count
!= 0);
1907 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) != 0)
1908 (void)free_inodedep(inodedep
);
1911 freeblks
->fb_state
|= DEPCOMPLETE
;
1913 * If the inode with zeroed block pointers is now on disk
1914 * we can start freeing blocks. Add freeblks to the worklist
1915 * instead of calling handle_workitem_freeblocks directly as
1916 * it is more likely that additional IO is needed to complete
1917 * the request here than in the !delay case.
1919 if ((freeblks
->fb_state
& ALLCOMPLETE
) == ALLCOMPLETE
)
1920 add_to_worklist(&freeblks
->fb_list
);
1925 * If the inode has never been written to disk (delay == 0),
1926 * then we can process the freeblks now that we have deleted
1930 handle_workitem_freeblocks(freeblks
);
1934 softdep_setup_freeblocks_bp(struct buf
*bp
, void *data
)
1936 struct softdep_setup_freeblocks_info
*info
= data
;
1937 struct inodedep
*inodedep
;
1939 if (getdirtybuf(&bp
, MNT_WAIT
) == 0) {
1940 kprintf("softdep_setup_freeblocks_bp(1): caught bp %p going away\n", bp
);
1943 if (bp
->b_vp
!= ITOV(info
->ip
) || (bp
->b_flags
& B_DELWRI
) == 0) {
1944 kprintf("softdep_setup_freeblocks_bp(2): caught bp %p going away\n", bp
);
1948 (void) inodedep_lookup(info
->fs
, info
->ip
->i_number
, 0, &inodedep
);
1949 deallocate_dependencies(bp
, inodedep
);
1950 bp
->b_flags
|= B_INVAL
| B_NOCACHE
;
1958 * Reclaim any dependency structures from a buffer that is about to
1959 * be reallocated to a new vnode. The buffer must be locked, thus,
1960 * no I/O completion operations can occur while we are manipulating
1961 * its associated dependencies. The mutex is held so that other I/O's
1962 * associated with related dependencies do not occur.
1965 deallocate_dependencies(struct buf
*bp
, struct inodedep
*inodedep
)
1967 struct worklist
*wk
;
1968 struct indirdep
*indirdep
;
1969 struct allocindir
*aip
;
1970 struct pagedep
*pagedep
;
1971 struct dirrem
*dirrem
;
1975 while ((wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
1976 switch (wk
->wk_type
) {
1979 indirdep
= WK_INDIRDEP(wk
);
1981 * None of the indirect pointers will ever be visible,
1982 * so they can simply be tossed. GOINGAWAY ensures
1983 * that allocated pointers will be saved in the buffer
1984 * cache until they are freed. Note that they will
1985 * only be able to be found by their physical address
1986 * since the inode mapping the logical address will
1987 * be gone. The save buffer used for the safe copy
1988 * was allocated in setup_allocindir_phase2 using
1989 * the physical address so it could be used for this
1990 * purpose. Hence we swap the safe copy with the real
1991 * copy, allowing the safe copy to be freed and holding
1992 * on to the real copy for later use in indir_trunc.
1994 * NOTE: ir_savebp is relative to the block device
1995 * so b_bio1 contains the device block number.
1997 if (indirdep
->ir_state
& GOINGAWAY
) {
1999 panic("deallocate_dependencies: already gone");
2001 indirdep
->ir_state
|= GOINGAWAY
;
2002 while ((aip
= LIST_FIRST(&indirdep
->ir_deplisthd
)) != 0)
2003 free_allocindir(aip
, inodedep
);
2004 if (bp
->b_bio1
.bio_offset
>= 0 ||
2005 bp
->b_bio2
.bio_offset
!= indirdep
->ir_savebp
->b_bio1
.bio_offset
) {
2007 panic("deallocate_dependencies: not indir");
2009 bcopy(bp
->b_data
, indirdep
->ir_savebp
->b_data
,
2011 WORKLIST_REMOVE(wk
);
2012 WORKLIST_INSERT_BP(indirdep
->ir_savebp
, wk
);
2016 pagedep
= WK_PAGEDEP(wk
);
2018 * None of the directory additions will ever be
2019 * visible, so they can simply be tossed.
2021 for (i
= 0; i
< DAHASHSZ
; i
++)
2023 LIST_FIRST(&pagedep
->pd_diraddhd
[i
])))
2025 while ((dap
= LIST_FIRST(&pagedep
->pd_pendinghd
)) != 0)
2028 * Copy any directory remove dependencies to the list
2029 * to be processed after the zero'ed inode is written.
2030 * If the inode has already been written, then they
2031 * can be dumped directly onto the work list.
2033 LIST_FOREACH(dirrem
, &pagedep
->pd_dirremhd
, dm_next
) {
2034 LIST_REMOVE(dirrem
, dm_next
);
2035 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2036 if (inodedep
== NULL
||
2037 (inodedep
->id_state
& ALLCOMPLETE
) ==
2039 add_to_worklist(&dirrem
->dm_list
);
2041 WORKLIST_INSERT(&inodedep
->id_bufwait
,
2044 WORKLIST_REMOVE(&pagedep
->pd_list
);
2045 LIST_REMOVE(pagedep
, pd_hash
);
2046 WORKITEM_FREE(pagedep
, D_PAGEDEP
);
2050 free_allocindir(WK_ALLOCINDIR(wk
), inodedep
);
2056 panic("deallocate_dependencies: Unexpected type %s",
2057 TYPENAME(wk
->wk_type
));
2062 panic("deallocate_dependencies: Unknown type %s",
2063 TYPENAME(wk
->wk_type
));
2070 * Free an allocdirect. Generate a new freefrag work request if appropriate.
2071 * This routine must be called with splbio interrupts blocked.
2074 free_allocdirect(struct allocdirectlst
*adphead
,
2075 struct allocdirect
*adp
, int delay
)
2079 if (lk
.lkt_held
== NOHOLDER
)
2080 panic("free_allocdirect: lock not held");
2082 if ((adp
->ad_state
& DEPCOMPLETE
) == 0)
2083 LIST_REMOVE(adp
, ad_deps
);
2084 TAILQ_REMOVE(adphead
, adp
, ad_next
);
2085 if ((adp
->ad_state
& COMPLETE
) == 0)
2086 WORKLIST_REMOVE(&adp
->ad_list
);
2087 if (adp
->ad_freefrag
!= NULL
) {
2089 WORKLIST_INSERT(&adp
->ad_inodedep
->id_bufwait
,
2090 &adp
->ad_freefrag
->ff_list
);
2092 add_to_worklist(&adp
->ad_freefrag
->ff_list
);
2094 WORKITEM_FREE(adp
, D_ALLOCDIRECT
);
2098 * Prepare an inode to be freed. The actual free operation is not
2099 * done until the zero'ed inode has been written to disk.
2102 softdep_freefile(struct vnode
*pvp
, ino_t ino
, int mode
)
2104 struct inode
*ip
= VTOI(pvp
);
2105 struct inodedep
*inodedep
;
2106 struct freefile
*freefile
;
2109 * This sets up the inode de-allocation dependency.
2111 MALLOC(freefile
, struct freefile
*, sizeof(struct freefile
),
2112 M_FREEFILE
, M_SOFTDEP_FLAGS
);
2113 freefile
->fx_list
.wk_type
= D_FREEFILE
;
2114 freefile
->fx_list
.wk_state
= 0;
2115 freefile
->fx_mode
= mode
;
2116 freefile
->fx_oldinum
= ino
;
2117 freefile
->fx_devvp
= ip
->i_devvp
;
2118 freefile
->fx_fs
= ip
->i_fs
;
2121 * If the inodedep does not exist, then the zero'ed inode has
2122 * been written to disk. If the allocated inode has never been
2123 * written to disk, then the on-disk inode is zero'ed. In either
2124 * case we can free the file immediately.
2127 if (inodedep_lookup(ip
->i_fs
, ino
, 0, &inodedep
) == 0 ||
2128 check_inode_unwritten(inodedep
)) {
2130 handle_workitem_freefile(freefile
);
2133 WORKLIST_INSERT(&inodedep
->id_inowait
, &freefile
->fx_list
);
2138 * Check to see if an inode has never been written to disk. If
2139 * so free the inodedep and return success, otherwise return failure.
2140 * This routine must be called with splbio interrupts blocked.
2142 * If we still have a bitmap dependency, then the inode has never
2143 * been written to disk. Drop the dependency as it is no longer
2144 * necessary since the inode is being deallocated. We set the
2145 * ALLCOMPLETE flags since the bitmap now properly shows that the
2146 * inode is not allocated. Even if the inode is actively being
2147 * written, it has been rolled back to its zero'ed state, so we
2148 * are ensured that a zero inode is what is on the disk. For short
2149 * lived files, this change will usually result in removing all the
2150 * dependencies from the inode so that it can be freed immediately.
2153 check_inode_unwritten(struct inodedep
*inodedep
)
2156 if ((inodedep
->id_state
& DEPCOMPLETE
) != 0 ||
2157 LIST_FIRST(&inodedep
->id_pendinghd
) != NULL
||
2158 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
2159 LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
2160 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
2161 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
||
2162 inodedep
->id_nlinkdelta
!= 0)
2166 * Another process might be in initiate_write_inodeblock
2167 * trying to allocate memory without holding "Softdep Lock".
2169 if ((inodedep
->id_state
& IOSTARTED
) != 0 &&
2170 inodedep
->id_savedino
== NULL
)
2173 inodedep
->id_state
|= ALLCOMPLETE
;
2174 LIST_REMOVE(inodedep
, id_deps
);
2175 inodedep
->id_buf
= NULL
;
2176 if (inodedep
->id_state
& ONWORKLIST
)
2177 WORKLIST_REMOVE(&inodedep
->id_list
);
2178 if (inodedep
->id_savedino
!= NULL
) {
2179 FREE(inodedep
->id_savedino
, M_INODEDEP
);
2180 inodedep
->id_savedino
= NULL
;
2182 if (free_inodedep(inodedep
) == 0) {
2184 panic("check_inode_unwritten: busy inode");
2190 * Try to free an inodedep structure. Return 1 if it could be freed.
2193 free_inodedep(struct inodedep
*inodedep
)
2196 if ((inodedep
->id_state
& ONWORKLIST
) != 0 ||
2197 (inodedep
->id_state
& ALLCOMPLETE
) != ALLCOMPLETE
||
2198 LIST_FIRST(&inodedep
->id_pendinghd
) != NULL
||
2199 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
2200 LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
2201 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
2202 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
||
2203 inodedep
->id_nlinkdelta
!= 0 || inodedep
->id_savedino
!= NULL
)
2205 LIST_REMOVE(inodedep
, id_hash
);
2206 WORKITEM_FREE(inodedep
, D_INODEDEP
);
2212 * This workitem routine performs the block de-allocation.
2213 * The workitem is added to the pending list after the updated
2214 * inode block has been written to disk. As mentioned above,
2215 * checks regarding the number of blocks de-allocated (compared
2216 * to the number of blocks allocated for the file) are also
2217 * performed in this function.
2220 handle_workitem_freeblocks(struct freeblks
*freeblks
)
2225 int i
, level
, bsize
;
2226 long nblocks
, blocksreleased
= 0;
2227 int error
, allerror
= 0;
2228 ufs_lbn_t baselbns
[NIADDR
], tmpval
;
2230 tip
.i_number
= freeblks
->fb_previousinum
;
2231 tip
.i_devvp
= freeblks
->fb_devvp
;
2232 tip
.i_dev
= freeblks
->fb_devvp
->v_rdev
;
2233 tip
.i_fs
= freeblks
->fb_fs
;
2234 tip
.i_size
= freeblks
->fb_oldsize
;
2235 tip
.i_uid
= freeblks
->fb_uid
;
2236 fs
= freeblks
->fb_fs
;
2238 baselbns
[0] = NDADDR
;
2239 for (i
= 1; i
< NIADDR
; i
++) {
2240 tmpval
*= NINDIR(fs
);
2241 baselbns
[i
] = baselbns
[i
- 1] + tmpval
;
2243 nblocks
= btodb(fs
->fs_bsize
);
2246 * Indirect blocks first.
2248 for (level
= (NIADDR
- 1); level
>= 0; level
--) {
2249 if ((bn
= freeblks
->fb_iblks
[level
]) == 0)
2251 if ((error
= indir_trunc(&tip
, fsbtodoff(fs
, bn
), level
,
2252 baselbns
[level
], &blocksreleased
)) == 0)
2254 ffs_blkfree(&tip
, bn
, fs
->fs_bsize
);
2255 blocksreleased
+= nblocks
;
2258 * All direct blocks or frags.
2260 for (i
= (NDADDR
- 1); i
>= 0; i
--) {
2261 if ((bn
= freeblks
->fb_dblks
[i
]) == 0)
2263 bsize
= blksize(fs
, &tip
, i
);
2264 ffs_blkfree(&tip
, bn
, bsize
);
2265 blocksreleased
+= btodb(bsize
);
2269 if (freeblks
->fb_chkcnt
!= blocksreleased
)
2270 kprintf("handle_workitem_freeblocks: block count\n");
2272 softdep_error("handle_workitem_freeblks", allerror
);
2273 #endif /* DIAGNOSTIC */
2274 WORKITEM_FREE(freeblks
, D_FREEBLKS
);
2278 * Release blocks associated with the inode ip and stored in the indirect
2279 * block at doffset. If level is greater than SINGLE, the block is an
2280 * indirect block and recursive calls to indirtrunc must be used to
2281 * cleanse other indirect blocks.
2284 indir_trunc(struct inode
*ip
, off_t doffset
, int level
, ufs_lbn_t lbn
,
2291 struct worklist
*wk
;
2292 struct indirdep
*indirdep
;
2293 int i
, lbnadd
, nblocks
;
2294 int error
, allerror
= 0;
2298 for (i
= level
; i
> 0; i
--)
2299 lbnadd
*= NINDIR(fs
);
2301 * Get buffer of block pointers to be freed. This routine is not
2302 * called until the zero'ed inode has been written, so it is safe
2303 * to free blocks as they are encountered. Because the inode has
2304 * been zero'ed, calls to bmap on these blocks will fail. So, we
2305 * have to use the on-disk address and the block device for the
2306 * filesystem to look them up. If the file was deleted before its
2307 * indirect blocks were all written to disk, the routine that set
2308 * us up (deallocate_dependencies) will have arranged to leave
2309 * a complete copy of the indirect block in memory for our use.
2310 * Otherwise we have to read the blocks in from the disk.
2313 if ((bp
= findblk(ip
->i_devvp
, doffset
)) != NULL
&&
2314 (wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
2316 * bp must be ir_savebp, which is held locked for our use.
2318 if (wk
->wk_type
!= D_INDIRDEP
||
2319 (indirdep
= WK_INDIRDEP(wk
))->ir_savebp
!= bp
||
2320 (indirdep
->ir_state
& GOINGAWAY
) == 0) {
2322 panic("indir_trunc: lost indirdep");
2324 WORKLIST_REMOVE(wk
);
2325 WORKITEM_FREE(indirdep
, D_INDIRDEP
);
2326 if (LIST_FIRST(&bp
->b_dep
) != NULL
) {
2328 panic("indir_trunc: dangling dep");
2333 error
= bread(ip
->i_devvp
, doffset
, (int)fs
->fs_bsize
, &bp
);
2338 * Recursively free indirect blocks.
2340 bap
= (ufs_daddr_t
*)bp
->b_data
;
2341 nblocks
= btodb(fs
->fs_bsize
);
2342 for (i
= NINDIR(fs
) - 1; i
>= 0; i
--) {
2343 if ((nb
= bap
[i
]) == 0)
2346 if ((error
= indir_trunc(ip
, fsbtodoff(fs
, nb
),
2347 level
- 1, lbn
+ (i
* lbnadd
), countp
)) != 0)
2350 ffs_blkfree(ip
, nb
, fs
->fs_bsize
);
2353 bp
->b_flags
|= B_INVAL
| B_NOCACHE
;
2359 * Free an allocindir.
2360 * This routine must be called with splbio interrupts blocked.
2363 free_allocindir(struct allocindir
*aip
, struct inodedep
*inodedep
)
2365 struct freefrag
*freefrag
;
2368 if (lk
.lkt_held
== NOHOLDER
)
2369 panic("free_allocindir: lock not held");
2371 if ((aip
->ai_state
& DEPCOMPLETE
) == 0)
2372 LIST_REMOVE(aip
, ai_deps
);
2373 if (aip
->ai_state
& ONWORKLIST
)
2374 WORKLIST_REMOVE(&aip
->ai_list
);
2375 LIST_REMOVE(aip
, ai_next
);
2376 if ((freefrag
= aip
->ai_freefrag
) != NULL
) {
2377 if (inodedep
== NULL
)
2378 add_to_worklist(&freefrag
->ff_list
);
2380 WORKLIST_INSERT(&inodedep
->id_bufwait
,
2381 &freefrag
->ff_list
);
2383 WORKITEM_FREE(aip
, D_ALLOCINDIR
);
2387 * Directory entry addition dependencies.
2389 * When adding a new directory entry, the inode (with its incremented link
2390 * count) must be written to disk before the directory entry's pointer to it.
2391 * Also, if the inode is newly allocated, the corresponding freemap must be
2392 * updated (on disk) before the directory entry's pointer. These requirements
2393 * are met via undo/redo on the directory entry's pointer, which consists
2394 * simply of the inode number.
2396 * As directory entries are added and deleted, the free space within a
2397 * directory block can become fragmented. The ufs filesystem will compact
2398 * a fragmented directory block to make space for a new entry. When this
2399 * occurs, the offsets of previously added entries change. Any "diradd"
2400 * dependency structures corresponding to these entries must be updated with
2405 * This routine is called after the in-memory inode's link
2406 * count has been incremented, but before the directory entry's
2407 * pointer to the inode has been set.
2410 * bp: buffer containing directory block
2411 * dp: inode for directory
2412 * diroffset: offset of new entry in directory
2413 * newinum: inode referenced by new directory entry
2414 * newdirbp: non-NULL => contents of new mkdir
2417 softdep_setup_directory_add(struct buf
*bp
, struct inode
*dp
, off_t diroffset
,
2418 ino_t newinum
, struct buf
*newdirbp
)
2420 int offset
; /* offset of new entry within directory block */
2421 ufs_lbn_t lbn
; /* block in directory containing new entry */
2424 struct pagedep
*pagedep
;
2425 struct inodedep
*inodedep
;
2426 struct mkdir
*mkdir1
, *mkdir2
;
2429 * Whiteouts have no dependencies.
2431 if (newinum
== WINO
) {
2432 if (newdirbp
!= NULL
)
2438 lbn
= lblkno(fs
, diroffset
);
2439 offset
= blkoff(fs
, diroffset
);
2440 MALLOC(dap
, struct diradd
*, sizeof(struct diradd
), M_DIRADD
,
2441 M_SOFTDEP_FLAGS
| M_ZERO
);
2442 dap
->da_list
.wk_type
= D_DIRADD
;
2443 dap
->da_offset
= offset
;
2444 dap
->da_newinum
= newinum
;
2445 dap
->da_state
= ATTACHED
;
2446 if (newdirbp
== NULL
) {
2447 dap
->da_state
|= DEPCOMPLETE
;
2450 dap
->da_state
|= MKDIR_BODY
| MKDIR_PARENT
;
2451 MALLOC(mkdir1
, struct mkdir
*, sizeof(struct mkdir
), M_MKDIR
,
2453 mkdir1
->md_list
.wk_type
= D_MKDIR
;
2454 mkdir1
->md_state
= MKDIR_BODY
;
2455 mkdir1
->md_diradd
= dap
;
2456 MALLOC(mkdir2
, struct mkdir
*, sizeof(struct mkdir
), M_MKDIR
,
2458 mkdir2
->md_list
.wk_type
= D_MKDIR
;
2459 mkdir2
->md_state
= MKDIR_PARENT
;
2460 mkdir2
->md_diradd
= dap
;
2462 * Dependency on "." and ".." being written to disk.
2464 mkdir1
->md_buf
= newdirbp
;
2466 LIST_INSERT_HEAD(&mkdirlisthd
, mkdir1
, md_mkdirs
);
2467 WORKLIST_INSERT_BP(newdirbp
, &mkdir1
->md_list
);
2471 * Dependency on link count increase for parent directory
2474 if (inodedep_lookup(dp
->i_fs
, dp
->i_number
, 0, &inodedep
) == 0
2475 || (inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
2476 dap
->da_state
&= ~MKDIR_PARENT
;
2477 WORKITEM_FREE(mkdir2
, D_MKDIR
);
2479 LIST_INSERT_HEAD(&mkdirlisthd
, mkdir2
, md_mkdirs
);
2480 WORKLIST_INSERT(&inodedep
->id_bufwait
,&mkdir2
->md_list
);
2484 * Link into parent directory pagedep to await its being written.
2486 if (pagedep_lookup(dp
, lbn
, DEPALLOC
, &pagedep
) == 0)
2487 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
2488 dap
->da_pagedep
= pagedep
;
2489 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(offset
)], dap
,
2492 * Link into its inodedep. Put it on the id_bufwait list if the inode
2493 * is not yet written. If it is written, do the post-inode write
2494 * processing to put it on the id_pendinghd list.
2496 (void) inodedep_lookup(fs
, newinum
, DEPALLOC
, &inodedep
);
2497 if ((inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
)
2498 diradd_inode_written(dap
, inodedep
);
2500 WORKLIST_INSERT(&inodedep
->id_bufwait
, &dap
->da_list
);
2505 * This procedure is called to change the offset of a directory
2506 * entry when compacting a directory block which must be owned
2507 * exclusively by the caller. Note that the actual entry movement
2508 * must be done in this procedure to ensure that no I/O completions
2509 * occur while the move is in progress.
2512 * dp: inode for directory
2513 * base: address of dp->i_offset
2514 * oldloc: address of old directory location
2515 * newloc: address of new directory location
2516 * entrysize: size of directory entry
2519 softdep_change_directoryentry_offset(struct inode
*dp
, caddr_t base
,
2520 caddr_t oldloc
, caddr_t newloc
,
2523 int offset
, oldoffset
, newoffset
;
2524 struct pagedep
*pagedep
;
2529 lbn
= lblkno(dp
->i_fs
, dp
->i_offset
);
2530 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2531 if (pagedep_lookup(dp
, lbn
, 0, &pagedep
) == 0)
2533 oldoffset
= offset
+ (oldloc
- base
);
2534 newoffset
= offset
+ (newloc
- base
);
2536 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[DIRADDHASH(oldoffset
)], da_pdlist
) {
2537 if (dap
->da_offset
!= oldoffset
)
2539 dap
->da_offset
= newoffset
;
2540 if (DIRADDHASH(newoffset
) == DIRADDHASH(oldoffset
))
2542 LIST_REMOVE(dap
, da_pdlist
);
2543 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(newoffset
)],
2549 LIST_FOREACH(dap
, &pagedep
->pd_pendinghd
, da_pdlist
) {
2550 if (dap
->da_offset
== oldoffset
) {
2551 dap
->da_offset
= newoffset
;
2557 bcopy(oldloc
, newloc
, entrysize
);
2562 * Free a diradd dependency structure. This routine must be called
2563 * with splbio interrupts blocked.
2566 free_diradd(struct diradd
*dap
)
2568 struct dirrem
*dirrem
;
2569 struct pagedep
*pagedep
;
2570 struct inodedep
*inodedep
;
2571 struct mkdir
*mkdir
, *nextmd
;
2574 if (lk
.lkt_held
== NOHOLDER
)
2575 panic("free_diradd: lock not held");
2577 WORKLIST_REMOVE(&dap
->da_list
);
2578 LIST_REMOVE(dap
, da_pdlist
);
2579 if ((dap
->da_state
& DIRCHG
) == 0) {
2580 pagedep
= dap
->da_pagedep
;
2582 dirrem
= dap
->da_previous
;
2583 pagedep
= dirrem
->dm_pagedep
;
2584 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2585 add_to_worklist(&dirrem
->dm_list
);
2587 if (inodedep_lookup(VFSTOUFS(pagedep
->pd_mnt
)->um_fs
, dap
->da_newinum
,
2589 (void) free_inodedep(inodedep
);
2590 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) != 0) {
2591 for (mkdir
= LIST_FIRST(&mkdirlisthd
); mkdir
; mkdir
= nextmd
) {
2592 nextmd
= LIST_NEXT(mkdir
, md_mkdirs
);
2593 if (mkdir
->md_diradd
!= dap
)
2595 dap
->da_state
&= ~mkdir
->md_state
;
2596 WORKLIST_REMOVE(&mkdir
->md_list
);
2597 LIST_REMOVE(mkdir
, md_mkdirs
);
2598 WORKITEM_FREE(mkdir
, D_MKDIR
);
2600 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) != 0) {
2602 panic("free_diradd: unfound ref");
2605 WORKITEM_FREE(dap
, D_DIRADD
);
2609 * Directory entry removal dependencies.
2611 * When removing a directory entry, the entry's inode pointer must be
2612 * zero'ed on disk before the corresponding inode's link count is decremented
2613 * (possibly freeing the inode for re-use). This dependency is handled by
2614 * updating the directory entry but delaying the inode count reduction until
2615 * after the directory block has been written to disk. After this point, the
2616 * inode count can be decremented whenever it is convenient.
2620 * This routine should be called immediately after removing
2621 * a directory entry. The inode's link count should not be
2622 * decremented by the calling procedure -- the soft updates
2623 * code will do this task when it is safe.
2626 * bp: buffer containing directory block
2627 * dp: inode for the directory being modified
2628 * ip: inode for directory entry being removed
2629 * isrmdir: indicates if doing RMDIR
2632 softdep_setup_remove(struct buf
*bp
, struct inode
*dp
, struct inode
*ip
,
2635 struct dirrem
*dirrem
, *prevdirrem
;
2638 * Allocate a new dirrem if appropriate and ACQUIRE_LOCK.
2640 dirrem
= newdirrem(bp
, dp
, ip
, isrmdir
, &prevdirrem
);
2643 * If the COMPLETE flag is clear, then there were no active
2644 * entries and we want to roll back to a zeroed entry until
2645 * the new inode is committed to disk. If the COMPLETE flag is
2646 * set then we have deleted an entry that never made it to
2647 * disk. If the entry we deleted resulted from a name change,
2648 * then the old name still resides on disk. We cannot delete
2649 * its inode (returned to us in prevdirrem) until the zeroed
2650 * directory entry gets to disk. The new inode has never been
2651 * referenced on the disk, so can be deleted immediately.
2653 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2654 LIST_INSERT_HEAD(&dirrem
->dm_pagedep
->pd_dirremhd
, dirrem
,
2658 if (prevdirrem
!= NULL
)
2659 LIST_INSERT_HEAD(&dirrem
->dm_pagedep
->pd_dirremhd
,
2660 prevdirrem
, dm_next
);
2661 dirrem
->dm_dirinum
= dirrem
->dm_pagedep
->pd_ino
;
2663 handle_workitem_remove(dirrem
);
2668 * Allocate a new dirrem if appropriate and return it along with
2669 * its associated pagedep. Called without a lock, returns with lock.
2671 static long num_dirrem
; /* number of dirrem allocated */
2675 * bp: buffer containing directory block
2676 * dp: inode for the directory being modified
2677 * ip: inode for directory entry being removed
2678 * isrmdir: indicates if doing RMDIR
2679 * prevdirremp: previously referenced inode, if any
2681 static struct dirrem
*
2682 newdirrem(struct buf
*bp
, struct inode
*dp
, struct inode
*ip
,
2683 int isrmdir
, struct dirrem
**prevdirremp
)
2688 struct dirrem
*dirrem
;
2689 struct pagedep
*pagedep
;
2692 * Whiteouts have no deletion dependencies.
2695 panic("newdirrem: whiteout");
2697 * If we are over our limit, try to improve the situation.
2698 * Limiting the number of dirrem structures will also limit
2699 * the number of freefile and freeblks structures.
2701 if (num_dirrem
> max_softdeps
/ 2 && speedup_syncer() == 0)
2702 (void) request_cleanup(FLUSH_REMOVE
, 0);
2704 MALLOC(dirrem
, struct dirrem
*, sizeof(struct dirrem
),
2705 M_DIRREM
, M_SOFTDEP_FLAGS
| M_ZERO
);
2706 dirrem
->dm_list
.wk_type
= D_DIRREM
;
2707 dirrem
->dm_state
= isrmdir
? RMDIR
: 0;
2708 dirrem
->dm_mnt
= ITOV(ip
)->v_mount
;
2709 dirrem
->dm_oldinum
= ip
->i_number
;
2710 *prevdirremp
= NULL
;
2713 lbn
= lblkno(dp
->i_fs
, dp
->i_offset
);
2714 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2715 if (pagedep_lookup(dp
, lbn
, DEPALLOC
, &pagedep
) == 0)
2716 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
2717 dirrem
->dm_pagedep
= pagedep
;
2719 * Check for a diradd dependency for the same directory entry.
2720 * If present, then both dependencies become obsolete and can
2721 * be de-allocated. Check for an entry on both the pd_dirraddhd
2722 * list and the pd_pendinghd list.
2725 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[DIRADDHASH(offset
)], da_pdlist
)
2726 if (dap
->da_offset
== offset
)
2730 LIST_FOREACH(dap
, &pagedep
->pd_pendinghd
, da_pdlist
)
2731 if (dap
->da_offset
== offset
)
2737 * Must be ATTACHED at this point.
2739 if ((dap
->da_state
& ATTACHED
) == 0) {
2741 panic("newdirrem: not ATTACHED");
2743 if (dap
->da_newinum
!= ip
->i_number
) {
2745 panic("newdirrem: inum %"PRId64
" should be %"PRId64
,
2746 ip
->i_number
, dap
->da_newinum
);
2749 * If we are deleting a changed name that never made it to disk,
2750 * then return the dirrem describing the previous inode (which
2751 * represents the inode currently referenced from this entry on disk).
2753 if ((dap
->da_state
& DIRCHG
) != 0) {
2754 *prevdirremp
= dap
->da_previous
;
2755 dap
->da_state
&= ~DIRCHG
;
2756 dap
->da_pagedep
= pagedep
;
2759 * We are deleting an entry that never made it to disk.
2760 * Mark it COMPLETE so we can delete its inode immediately.
2762 dirrem
->dm_state
|= COMPLETE
;
2768 * Directory entry change dependencies.
2770 * Changing an existing directory entry requires that an add operation
2771 * be completed first followed by a deletion. The semantics for the addition
2772 * are identical to the description of adding a new entry above except
2773 * that the rollback is to the old inode number rather than zero. Once
2774 * the addition dependency is completed, the removal is done as described
2775 * in the removal routine above.
2779 * This routine should be called immediately after changing
2780 * a directory entry. The inode's link count should not be
2781 * decremented by the calling procedure -- the soft updates
2782 * code will perform this task when it is safe.
2785 * bp: buffer containing directory block
2786 * dp: inode for the directory being modified
2787 * ip: inode for directory entry being removed
2788 * newinum: new inode number for changed entry
2789 * isrmdir: indicates if doing RMDIR
2792 softdep_setup_directory_change(struct buf
*bp
, struct inode
*dp
,
2793 struct inode
*ip
, ino_t newinum
,
2797 struct diradd
*dap
= NULL
;
2798 struct dirrem
*dirrem
, *prevdirrem
;
2799 struct pagedep
*pagedep
;
2800 struct inodedep
*inodedep
;
2802 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2805 * Whiteouts do not need diradd dependencies.
2807 if (newinum
!= WINO
) {
2808 MALLOC(dap
, struct diradd
*, sizeof(struct diradd
),
2809 M_DIRADD
, M_SOFTDEP_FLAGS
| M_ZERO
);
2810 dap
->da_list
.wk_type
= D_DIRADD
;
2811 dap
->da_state
= DIRCHG
| ATTACHED
| DEPCOMPLETE
;
2812 dap
->da_offset
= offset
;
2813 dap
->da_newinum
= newinum
;
2817 * Allocate a new dirrem and ACQUIRE_LOCK.
2819 dirrem
= newdirrem(bp
, dp
, ip
, isrmdir
, &prevdirrem
);
2820 pagedep
= dirrem
->dm_pagedep
;
2822 * The possible values for isrmdir:
2823 * 0 - non-directory file rename
2824 * 1 - directory rename within same directory
2825 * inum - directory rename to new directory of given inode number
2826 * When renaming to a new directory, we are both deleting and
2827 * creating a new directory entry, so the link count on the new
2828 * directory should not change. Thus we do not need the followup
2829 * dirrem which is usually done in handle_workitem_remove. We set
2830 * the DIRCHG flag to tell handle_workitem_remove to skip the
2834 dirrem
->dm_state
|= DIRCHG
;
2837 * Whiteouts have no additional dependencies,
2838 * so just put the dirrem on the correct list.
2840 if (newinum
== WINO
) {
2841 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2842 LIST_INSERT_HEAD(&pagedep
->pd_dirremhd
, dirrem
,
2845 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2846 add_to_worklist(&dirrem
->dm_list
);
2853 * If the COMPLETE flag is clear, then there were no active
2854 * entries and we want to roll back to the previous inode until
2855 * the new inode is committed to disk. If the COMPLETE flag is
2856 * set, then we have deleted an entry that never made it to disk.
2857 * If the entry we deleted resulted from a name change, then the old
2858 * inode reference still resides on disk. Any rollback that we do
2859 * needs to be to that old inode (returned to us in prevdirrem). If
2860 * the entry we deleted resulted from a create, then there is
2861 * no entry on the disk, so we want to roll back to zero rather
2862 * than the uncommitted inode. In either of the COMPLETE cases we
2863 * want to immediately free the unwritten and unreferenced inode.
2865 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2866 dap
->da_previous
= dirrem
;
2868 if (prevdirrem
!= NULL
) {
2869 dap
->da_previous
= prevdirrem
;
2871 dap
->da_state
&= ~DIRCHG
;
2872 dap
->da_pagedep
= pagedep
;
2874 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2875 add_to_worklist(&dirrem
->dm_list
);
2878 * Link into its inodedep. Put it on the id_bufwait list if the inode
2879 * is not yet written. If it is written, do the post-inode write
2880 * processing to put it on the id_pendinghd list.
2882 if (inodedep_lookup(dp
->i_fs
, newinum
, DEPALLOC
, &inodedep
) == 0 ||
2883 (inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
2884 dap
->da_state
|= COMPLETE
;
2885 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
2886 WORKLIST_INSERT(&inodedep
->id_pendinghd
, &dap
->da_list
);
2888 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(offset
)],
2890 WORKLIST_INSERT(&inodedep
->id_bufwait
, &dap
->da_list
);
2896 * Called whenever the link count on an inode is changed.
2897 * It creates an inode dependency so that the new reference(s)
2898 * to the inode cannot be committed to disk until the updated
2899 * inode has been written.
2902 * ip: the inode with the increased link count
2905 softdep_change_linkcnt(struct inode
*ip
)
2907 struct inodedep
*inodedep
;
2910 (void) inodedep_lookup(ip
->i_fs
, ip
->i_number
, DEPALLOC
, &inodedep
);
2911 if (ip
->i_nlink
< ip
->i_effnlink
) {
2913 panic("softdep_change_linkcnt: bad delta");
2915 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2920 * This workitem decrements the inode's link count.
2921 * If the link count reaches zero, the file is removed.
2924 handle_workitem_remove(struct dirrem
*dirrem
)
2926 struct inodedep
*inodedep
;
2932 if ((error
= VFS_VGET(dirrem
->dm_mnt
, dirrem
->dm_oldinum
, &vp
)) != 0) {
2933 softdep_error("handle_workitem_remove: vget", error
);
2938 if ((inodedep_lookup(ip
->i_fs
, dirrem
->dm_oldinum
, 0, &inodedep
)) == 0){
2940 panic("handle_workitem_remove: lost inodedep");
2943 * Normal file deletion.
2945 if ((dirrem
->dm_state
& RMDIR
) == 0) {
2947 ip
->i_flag
|= IN_CHANGE
;
2948 if (ip
->i_nlink
< ip
->i_effnlink
) {
2950 panic("handle_workitem_remove: bad file delta");
2952 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2956 WORKITEM_FREE(dirrem
, D_DIRREM
);
2960 * Directory deletion. Decrement reference count for both the
2961 * just deleted parent directory entry and the reference for ".".
2962 * Next truncate the directory to length zero. When the
2963 * truncation completes, arrange to have the reference count on
2964 * the parent decremented to account for the loss of "..".
2967 ip
->i_flag
|= IN_CHANGE
;
2968 if (ip
->i_nlink
< ip
->i_effnlink
) {
2970 panic("handle_workitem_remove: bad dir delta");
2972 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2974 if ((error
= ffs_truncate(vp
, (off_t
)0, 0, proc0
.p_ucred
)) != 0)
2975 softdep_error("handle_workitem_remove: truncate", error
);
2977 * Rename a directory to a new parent. Since, we are both deleting
2978 * and creating a new directory entry, the link count on the new
2979 * directory should not change. Thus we skip the followup dirrem.
2981 if (dirrem
->dm_state
& DIRCHG
) {
2984 WORKITEM_FREE(dirrem
, D_DIRREM
);
2988 * If the inodedep does not exist, then the zero'ed inode has
2989 * been written to disk. If the allocated inode has never been
2990 * written to disk, then the on-disk inode is zero'ed. In either
2991 * case we can remove the file immediately.
2994 dirrem
->dm_state
= 0;
2995 oldinum
= dirrem
->dm_oldinum
;
2996 dirrem
->dm_oldinum
= dirrem
->dm_dirinum
;
2997 if (inodedep_lookup(ip
->i_fs
, oldinum
, 0, &inodedep
) == 0 ||
2998 check_inode_unwritten(inodedep
)) {
3001 handle_workitem_remove(dirrem
);
3004 WORKLIST_INSERT(&inodedep
->id_inowait
, &dirrem
->dm_list
);
3006 ip
->i_flag
|= IN_CHANGE
;
3012 * Inode de-allocation dependencies.
3014 * When an inode's link count is reduced to zero, it can be de-allocated. We
3015 * found it convenient to postpone de-allocation until after the inode is
3016 * written to disk with its new link count (zero). At this point, all of the
3017 * on-disk inode's block pointers are nullified and, with careful dependency
3018 * list ordering, all dependencies related to the inode will be satisfied and
3019 * the corresponding dependency structures de-allocated. So, if/when the
3020 * inode is reused, there will be no mixing of old dependencies with new
3021 * ones. This artificial dependency is set up by the block de-allocation
3022 * procedure above (softdep_setup_freeblocks) and completed by the
3023 * following procedure.
3026 handle_workitem_freefile(struct freefile
*freefile
)
3030 struct inodedep
*idp
;
3035 error
= inodedep_lookup(freefile
->fx_fs
, freefile
->fx_oldinum
, 0, &idp
);
3038 panic("handle_workitem_freefile: inodedep survived");
3040 tip
.i_devvp
= freefile
->fx_devvp
;
3041 tip
.i_dev
= freefile
->fx_devvp
->v_rdev
;
3042 tip
.i_fs
= freefile
->fx_fs
;
3044 if ((error
= ffs_freefile(&vp
, freefile
->fx_oldinum
, freefile
->fx_mode
)) != 0)
3045 softdep_error("handle_workitem_freefile", error
);
3046 WORKITEM_FREE(freefile
, D_FREEFILE
);
3050 * Helper function which unlinks marker element from work list and returns
3051 * the next element on the list.
3053 static __inline
struct worklist
*
3054 markernext(struct worklist
*marker
)
3056 struct worklist
*next
;
3058 next
= LIST_NEXT(marker
, wk_list
);
3059 LIST_REMOVE(marker
, wk_list
);
3064 * checkread, checkwrite
3068 softdep_checkread(struct buf
*bp
)
3074 softdep_checkwrite(struct buf
*bp
)
3082 * The dependency structures constructed above are most actively used when file
3083 * system blocks are written to disk. No constraints are placed on when a
3084 * block can be written, but unsatisfied update dependencies are made safe by
3085 * modifying (or replacing) the source memory for the duration of the disk
3086 * write. When the disk write completes, the memory block is again brought
3089 * In-core inode structure reclamation.
3091 * Because there are a finite number of "in-core" inode structures, they are
3092 * reused regularly. By transferring all inode-related dependencies to the
3093 * in-memory inode block and indexing them separately (via "inodedep"s), we
3094 * can allow "in-core" inode structures to be reused at any time and avoid
3095 * any increase in contention.
3097 * Called just before entering the device driver to initiate a new disk I/O.
3098 * The buffer must be locked, thus, no I/O completion operations can occur
3099 * while we are manipulating its associated dependencies.
3102 * bp: structure describing disk write to occur
3105 softdep_disk_io_initiation(struct buf
*bp
)
3107 struct worklist
*wk
;
3108 struct worklist marker
;
3109 struct indirdep
*indirdep
;
3112 * We only care about write operations. There should never
3113 * be dependencies for reads.
3115 if (bp
->b_cmd
== BUF_CMD_READ
)
3116 panic("softdep_disk_io_initiation: read");
3118 marker
.wk_type
= D_LAST
+ 1; /* Not a normal workitem */
3121 * Do any necessary pre-I/O processing.
3123 for (wk
= LIST_FIRST(&bp
->b_dep
); wk
; wk
= markernext(&marker
)) {
3124 LIST_INSERT_AFTER(wk
, &marker
, wk_list
);
3126 switch (wk
->wk_type
) {
3129 initiate_write_filepage(WK_PAGEDEP(wk
), bp
);
3133 initiate_write_inodeblock(WK_INODEDEP(wk
), bp
);
3137 indirdep
= WK_INDIRDEP(wk
);
3138 if (indirdep
->ir_state
& GOINGAWAY
)
3139 panic("disk_io_initiation: indirdep gone");
3141 * If there are no remaining dependencies, this
3142 * will be writing the real pointers, so the
3143 * dependency can be freed.
3145 if (LIST_FIRST(&indirdep
->ir_deplisthd
) == NULL
) {
3146 indirdep
->ir_savebp
->b_flags
|= B_INVAL
| B_NOCACHE
;
3147 brelse(indirdep
->ir_savebp
);
3148 /* inline expand WORKLIST_REMOVE(wk); */
3149 wk
->wk_state
&= ~ONWORKLIST
;
3150 LIST_REMOVE(wk
, wk_list
);
3151 WORKITEM_FREE(indirdep
, D_INDIRDEP
);
3155 * Replace up-to-date version with safe version.
3157 MALLOC(indirdep
->ir_saveddata
, caddr_t
, bp
->b_bcount
,
3158 M_INDIRDEP
, M_SOFTDEP_FLAGS
);
3160 indirdep
->ir_state
&= ~ATTACHED
;
3161 indirdep
->ir_state
|= UNDONE
;
3162 bcopy(bp
->b_data
, indirdep
->ir_saveddata
, bp
->b_bcount
);
3163 bcopy(indirdep
->ir_savebp
->b_data
, bp
->b_data
,
3175 panic("handle_disk_io_initiation: Unexpected type %s",
3176 TYPENAME(wk
->wk_type
));
3183 * Called from within the procedure above to deal with unsatisfied
3184 * allocation dependencies in a directory. The buffer must be locked,
3185 * thus, no I/O completion operations can occur while we are
3186 * manipulating its associated dependencies.
3189 initiate_write_filepage(struct pagedep
*pagedep
, struct buf
*bp
)
3195 if (pagedep
->pd_state
& IOSTARTED
) {
3197 * This can only happen if there is a driver that does not
3198 * understand chaining. Here biodone will reissue the call
3199 * to strategy for the incomplete buffers.
3201 kprintf("initiate_write_filepage: already started\n");
3204 pagedep
->pd_state
|= IOSTARTED
;
3206 for (i
= 0; i
< DAHASHSZ
; i
++) {
3207 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[i
], da_pdlist
) {
3208 ep
= (struct direct
*)
3209 ((char *)bp
->b_data
+ dap
->da_offset
);
3210 if (ep
->d_ino
!= dap
->da_newinum
) {
3212 panic("%s: dir inum %d != new %"PRId64
,
3213 "initiate_write_filepage",
3214 ep
->d_ino
, dap
->da_newinum
);
3216 if (dap
->da_state
& DIRCHG
)
3217 ep
->d_ino
= dap
->da_previous
->dm_oldinum
;
3220 dap
->da_state
&= ~ATTACHED
;
3221 dap
->da_state
|= UNDONE
;
3228 * Called from within the procedure above to deal with unsatisfied
3229 * allocation dependencies in an inodeblock. The buffer must be
3230 * locked, thus, no I/O completion operations can occur while we
3231 * are manipulating its associated dependencies.
3234 * bp: The inode block
3237 initiate_write_inodeblock(struct inodedep
*inodedep
, struct buf
*bp
)
3239 struct allocdirect
*adp
, *lastadp
;
3240 struct ufs1_dinode
*dp
;
3241 struct ufs1_dinode
*sip
;
3243 ufs_lbn_t prevlbn
= 0;
3246 if (inodedep
->id_state
& IOSTARTED
)
3247 panic("initiate_write_inodeblock: already started");
3248 inodedep
->id_state
|= IOSTARTED
;
3249 fs
= inodedep
->id_fs
;
3250 dp
= (struct ufs1_dinode
*)bp
->b_data
+
3251 ino_to_fsbo(fs
, inodedep
->id_ino
);
3253 * If the bitmap is not yet written, then the allocated
3254 * inode cannot be written to disk.
3256 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
3257 if (inodedep
->id_savedino
!= NULL
)
3258 panic("initiate_write_inodeblock: already doing I/O");
3259 MALLOC(sip
, struct ufs1_dinode
*,
3260 sizeof(struct ufs1_dinode
), M_INODEDEP
, M_SOFTDEP_FLAGS
);
3261 inodedep
->id_savedino
= sip
;
3262 *inodedep
->id_savedino
= *dp
;
3263 bzero((caddr_t
)dp
, sizeof(struct ufs1_dinode
));
3264 dp
->di_gen
= inodedep
->id_savedino
->di_gen
;
3268 * If no dependencies, then there is nothing to roll back.
3270 inodedep
->id_savedsize
= dp
->di_size
;
3271 if (TAILQ_FIRST(&inodedep
->id_inoupdt
) == NULL
)
3274 * Set the dependencies to busy.
3277 for (deplist
= 0, adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
;
3278 adp
= TAILQ_NEXT(adp
, ad_next
)) {
3280 if (deplist
!= 0 && prevlbn
>= adp
->ad_lbn
) {
3282 panic("softdep_write_inodeblock: lbn order");
3284 prevlbn
= adp
->ad_lbn
;
3285 if (adp
->ad_lbn
< NDADDR
&&
3286 dp
->di_db
[adp
->ad_lbn
] != adp
->ad_newblkno
) {
3288 panic("%s: direct pointer #%ld mismatch %d != %d",
3289 "softdep_write_inodeblock", adp
->ad_lbn
,
3290 dp
->di_db
[adp
->ad_lbn
], adp
->ad_newblkno
);
3292 if (adp
->ad_lbn
>= NDADDR
&&
3293 dp
->di_ib
[adp
->ad_lbn
- NDADDR
] != adp
->ad_newblkno
) {
3295 panic("%s: indirect pointer #%ld mismatch %d != %d",
3296 "softdep_write_inodeblock", adp
->ad_lbn
- NDADDR
,
3297 dp
->di_ib
[adp
->ad_lbn
- NDADDR
], adp
->ad_newblkno
);
3299 deplist
|= 1 << adp
->ad_lbn
;
3300 if ((adp
->ad_state
& ATTACHED
) == 0) {
3302 panic("softdep_write_inodeblock: Unknown state 0x%x",
3305 #endif /* DIAGNOSTIC */
3306 adp
->ad_state
&= ~ATTACHED
;
3307 adp
->ad_state
|= UNDONE
;
3310 * The on-disk inode cannot claim to be any larger than the last
3311 * fragment that has been written. Otherwise, the on-disk inode
3312 * might have fragments that were not the last block in the file
3313 * which would corrupt the filesystem.
3315 for (lastadp
= NULL
, adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
;
3316 lastadp
= adp
, adp
= TAILQ_NEXT(adp
, ad_next
)) {
3317 if (adp
->ad_lbn
>= NDADDR
)
3319 dp
->di_db
[adp
->ad_lbn
] = adp
->ad_oldblkno
;
3320 /* keep going until hitting a rollback to a frag */
3321 if (adp
->ad_oldsize
== 0 || adp
->ad_oldsize
== fs
->fs_bsize
)
3323 dp
->di_size
= fs
->fs_bsize
* adp
->ad_lbn
+ adp
->ad_oldsize
;
3324 for (i
= adp
->ad_lbn
+ 1; i
< NDADDR
; i
++) {
3326 if (dp
->di_db
[i
] != 0 && (deplist
& (1 << i
)) == 0) {
3328 panic("softdep_write_inodeblock: lost dep1");
3330 #endif /* DIAGNOSTIC */
3333 for (i
= 0; i
< NIADDR
; i
++) {
3335 if (dp
->di_ib
[i
] != 0 &&
3336 (deplist
& ((1 << NDADDR
) << i
)) == 0) {
3338 panic("softdep_write_inodeblock: lost dep2");
3340 #endif /* DIAGNOSTIC */
3347 * If we have zero'ed out the last allocated block of the file,
3348 * roll back the size to the last currently allocated block.
3349 * We know that this last allocated block is a full-sized as
3350 * we already checked for fragments in the loop above.
3352 if (lastadp
!= NULL
&&
3353 dp
->di_size
<= (lastadp
->ad_lbn
+ 1) * fs
->fs_bsize
) {
3354 for (i
= lastadp
->ad_lbn
; i
>= 0; i
--)
3355 if (dp
->di_db
[i
] != 0)
3357 dp
->di_size
= (i
+ 1) * fs
->fs_bsize
;
3360 * The only dependencies are for indirect blocks.
3362 * The file size for indirect block additions is not guaranteed.
3363 * Such a guarantee would be non-trivial to achieve. The conventional
3364 * synchronous write implementation also does not make this guarantee.
3365 * Fsck should catch and fix discrepancies. Arguably, the file size
3366 * can be over-estimated without destroying integrity when the file
3367 * moves into the indirect blocks (i.e., is large). If we want to
3368 * postpone fsck, we are stuck with this argument.
3370 for (; adp
; adp
= TAILQ_NEXT(adp
, ad_next
))
3371 dp
->di_ib
[adp
->ad_lbn
- NDADDR
] = 0;
3376 * This routine is called during the completion interrupt
3377 * service routine for a disk write (from the procedure called
3378 * by the device driver to inform the filesystem caches of
3379 * a request completion). It should be called early in this
3380 * procedure, before the block is made available to other
3381 * processes or other routines are called.
3384 * bp: describes the completed disk write
3387 softdep_disk_write_complete(struct buf
*bp
)
3389 struct worklist
*wk
;
3390 struct workhead reattach
;
3391 struct newblk
*newblk
;
3392 struct allocindir
*aip
;
3393 struct allocdirect
*adp
;
3394 struct indirdep
*indirdep
;
3395 struct inodedep
*inodedep
;
3396 struct bmsafemap
*bmsafemap
;
3399 if (lk
.lkt_held
!= NOHOLDER
)
3400 panic("softdep_disk_write_complete: lock is held");
3401 lk
.lkt_held
= SPECIAL_FLAG
;
3403 LIST_INIT(&reattach
);
3404 while ((wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
3405 WORKLIST_REMOVE(wk
);
3406 switch (wk
->wk_type
) {
3409 if (handle_written_filepage(WK_PAGEDEP(wk
), bp
))
3410 WORKLIST_INSERT(&reattach
, wk
);
3414 if (handle_written_inodeblock(WK_INODEDEP(wk
), bp
))
3415 WORKLIST_INSERT(&reattach
, wk
);
3419 bmsafemap
= WK_BMSAFEMAP(wk
);
3420 while ((newblk
= LIST_FIRST(&bmsafemap
->sm_newblkhd
))) {
3421 newblk
->nb_state
|= DEPCOMPLETE
;
3422 newblk
->nb_bmsafemap
= NULL
;
3423 LIST_REMOVE(newblk
, nb_deps
);
3426 LIST_FIRST(&bmsafemap
->sm_allocdirecthd
))) {
3427 adp
->ad_state
|= DEPCOMPLETE
;
3429 LIST_REMOVE(adp
, ad_deps
);
3430 handle_allocdirect_partdone(adp
);
3433 LIST_FIRST(&bmsafemap
->sm_allocindirhd
))) {
3434 aip
->ai_state
|= DEPCOMPLETE
;
3436 LIST_REMOVE(aip
, ai_deps
);
3437 handle_allocindir_partdone(aip
);
3440 LIST_FIRST(&bmsafemap
->sm_inodedephd
)) != NULL
) {
3441 inodedep
->id_state
|= DEPCOMPLETE
;
3442 LIST_REMOVE(inodedep
, id_deps
);
3443 inodedep
->id_buf
= NULL
;
3445 WORKITEM_FREE(bmsafemap
, D_BMSAFEMAP
);
3449 handle_written_mkdir(WK_MKDIR(wk
), MKDIR_BODY
);
3453 adp
= WK_ALLOCDIRECT(wk
);
3454 adp
->ad_state
|= COMPLETE
;
3455 handle_allocdirect_partdone(adp
);
3459 aip
= WK_ALLOCINDIR(wk
);
3460 aip
->ai_state
|= COMPLETE
;
3461 handle_allocindir_partdone(aip
);
3465 indirdep
= WK_INDIRDEP(wk
);
3466 if (indirdep
->ir_state
& GOINGAWAY
) {
3467 lk
.lkt_held
= NOHOLDER
;
3468 panic("disk_write_complete: indirdep gone");
3470 bcopy(indirdep
->ir_saveddata
, bp
->b_data
, bp
->b_bcount
);
3471 FREE(indirdep
->ir_saveddata
, M_INDIRDEP
);
3472 indirdep
->ir_saveddata
= 0;
3473 indirdep
->ir_state
&= ~UNDONE
;
3474 indirdep
->ir_state
|= ATTACHED
;
3475 while ((aip
= LIST_FIRST(&indirdep
->ir_donehd
)) != 0) {
3476 handle_allocindir_partdone(aip
);
3477 if (aip
== LIST_FIRST(&indirdep
->ir_donehd
)) {
3478 lk
.lkt_held
= NOHOLDER
;
3479 panic("disk_write_complete: not gone");
3482 WORKLIST_INSERT(&reattach
, wk
);
3483 if ((bp
->b_flags
& B_DELWRI
) == 0)
3484 stat_indir_blk_ptrs
++;
3489 lk
.lkt_held
= NOHOLDER
;
3490 panic("handle_disk_write_complete: Unknown type %s",
3491 TYPENAME(wk
->wk_type
));
3496 * Reattach any requests that must be redone.
3498 while ((wk
= LIST_FIRST(&reattach
)) != NULL
) {
3499 WORKLIST_REMOVE(wk
);
3500 WORKLIST_INSERT_BP(bp
, wk
);
3503 if (lk
.lkt_held
!= SPECIAL_FLAG
)
3504 panic("softdep_disk_write_complete: lock lost");
3505 lk
.lkt_held
= NOHOLDER
;
3510 * Called from within softdep_disk_write_complete above. Note that
3511 * this routine is always called from interrupt level with further
3512 * splbio interrupts blocked.
3515 * adp: the completed allocdirect
3518 handle_allocdirect_partdone(struct allocdirect
*adp
)
3520 struct allocdirect
*listadp
;
3521 struct inodedep
*inodedep
;
3524 if ((adp
->ad_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3526 if (adp
->ad_buf
!= NULL
) {
3527 lk
.lkt_held
= NOHOLDER
;
3528 panic("handle_allocdirect_partdone: dangling dep");
3531 * The on-disk inode cannot claim to be any larger than the last
3532 * fragment that has been written. Otherwise, the on-disk inode
3533 * might have fragments that were not the last block in the file
3534 * which would corrupt the filesystem. Thus, we cannot free any
3535 * allocdirects after one whose ad_oldblkno claims a fragment as
3536 * these blocks must be rolled back to zero before writing the inode.
3537 * We check the currently active set of allocdirects in id_inoupdt.
3539 inodedep
= adp
->ad_inodedep
;
3540 bsize
= inodedep
->id_fs
->fs_bsize
;
3541 TAILQ_FOREACH(listadp
, &inodedep
->id_inoupdt
, ad_next
) {
3542 /* found our block */
3545 /* continue if ad_oldlbn is not a fragment */
3546 if (listadp
->ad_oldsize
== 0 ||
3547 listadp
->ad_oldsize
== bsize
)
3549 /* hit a fragment */
3553 * If we have reached the end of the current list without
3554 * finding the just finished dependency, then it must be
3555 * on the future dependency list. Future dependencies cannot
3556 * be freed until they are moved to the current list.
3558 if (listadp
== NULL
) {
3560 TAILQ_FOREACH(listadp
, &inodedep
->id_newinoupdt
, ad_next
)
3561 /* found our block */
3564 if (listadp
== NULL
) {
3565 lk
.lkt_held
= NOHOLDER
;
3566 panic("handle_allocdirect_partdone: lost dep");
3572 * If we have found the just finished dependency, then free
3573 * it along with anything that follows it that is complete.
3575 for (; adp
; adp
= listadp
) {
3576 listadp
= TAILQ_NEXT(adp
, ad_next
);
3577 if ((adp
->ad_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3579 free_allocdirect(&inodedep
->id_inoupdt
, adp
, 1);
3584 * Called from within softdep_disk_write_complete above. Note that
3585 * this routine is always called from interrupt level with further
3586 * splbio interrupts blocked.
3589 * aip: the completed allocindir
3592 handle_allocindir_partdone(struct allocindir
*aip
)
3594 struct indirdep
*indirdep
;
3596 if ((aip
->ai_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3598 if (aip
->ai_buf
!= NULL
) {
3599 lk
.lkt_held
= NOHOLDER
;
3600 panic("handle_allocindir_partdone: dangling dependency");
3602 indirdep
= aip
->ai_indirdep
;
3603 if (indirdep
->ir_state
& UNDONE
) {
3604 LIST_REMOVE(aip
, ai_next
);
3605 LIST_INSERT_HEAD(&indirdep
->ir_donehd
, aip
, ai_next
);
3608 ((ufs_daddr_t
*)indirdep
->ir_savebp
->b_data
)[aip
->ai_offset
] =
3610 LIST_REMOVE(aip
, ai_next
);
3611 if (aip
->ai_freefrag
!= NULL
)
3612 add_to_worklist(&aip
->ai_freefrag
->ff_list
);
3613 WORKITEM_FREE(aip
, D_ALLOCINDIR
);
3617 * Called from within softdep_disk_write_complete above to restore
3618 * in-memory inode block contents to their most up-to-date state. Note
3619 * that this routine is always called from interrupt level with further
3620 * splbio interrupts blocked.
3623 * bp: buffer containing the inode block
3626 handle_written_inodeblock(struct inodedep
*inodedep
, struct buf
*bp
)
3628 struct worklist
*wk
, *filefree
;
3629 struct allocdirect
*adp
, *nextadp
;
3630 struct ufs1_dinode
*dp
;
3633 if ((inodedep
->id_state
& IOSTARTED
) == 0) {
3634 lk
.lkt_held
= NOHOLDER
;
3635 panic("handle_written_inodeblock: not started");
3637 inodedep
->id_state
&= ~IOSTARTED
;
3638 dp
= (struct ufs1_dinode
*)bp
->b_data
+
3639 ino_to_fsbo(inodedep
->id_fs
, inodedep
->id_ino
);
3641 * If we had to rollback the inode allocation because of
3642 * bitmaps being incomplete, then simply restore it.
3643 * Keep the block dirty so that it will not be reclaimed until
3644 * all associated dependencies have been cleared and the
3645 * corresponding updates written to disk.
3647 if (inodedep
->id_savedino
!= NULL
) {
3648 *dp
= *inodedep
->id_savedino
;
3649 FREE(inodedep
->id_savedino
, M_INODEDEP
);
3650 inodedep
->id_savedino
= NULL
;
3651 if ((bp
->b_flags
& B_DELWRI
) == 0)
3652 stat_inode_bitmap
++;
3656 inodedep
->id_state
|= COMPLETE
;
3658 * Roll forward anything that had to be rolled back before
3659 * the inode could be updated.
3662 for (adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
; adp
= nextadp
) {
3663 nextadp
= TAILQ_NEXT(adp
, ad_next
);
3664 if (adp
->ad_state
& ATTACHED
) {
3665 lk
.lkt_held
= NOHOLDER
;
3666 panic("handle_written_inodeblock: new entry");
3668 if (adp
->ad_lbn
< NDADDR
) {
3669 if (dp
->di_db
[adp
->ad_lbn
] != adp
->ad_oldblkno
) {
3670 lk
.lkt_held
= NOHOLDER
;
3671 panic("%s: %s #%ld mismatch %d != %d",
3672 "handle_written_inodeblock",
3673 "direct pointer", adp
->ad_lbn
,
3674 dp
->di_db
[adp
->ad_lbn
], adp
->ad_oldblkno
);
3676 dp
->di_db
[adp
->ad_lbn
] = adp
->ad_newblkno
;
3678 if (dp
->di_ib
[adp
->ad_lbn
- NDADDR
] != 0) {
3679 lk
.lkt_held
= NOHOLDER
;
3680 panic("%s: %s #%ld allocated as %d",
3681 "handle_written_inodeblock",
3682 "indirect pointer", adp
->ad_lbn
- NDADDR
,
3683 dp
->di_ib
[adp
->ad_lbn
- NDADDR
]);
3685 dp
->di_ib
[adp
->ad_lbn
- NDADDR
] = adp
->ad_newblkno
;
3687 adp
->ad_state
&= ~UNDONE
;
3688 adp
->ad_state
|= ATTACHED
;
3691 if (hadchanges
&& (bp
->b_flags
& B_DELWRI
) == 0)
3692 stat_direct_blk_ptrs
++;
3694 * Reset the file size to its most up-to-date value.
3696 if (inodedep
->id_savedsize
== -1) {
3697 lk
.lkt_held
= NOHOLDER
;
3698 panic("handle_written_inodeblock: bad size");
3700 if (dp
->di_size
!= inodedep
->id_savedsize
) {
3701 dp
->di_size
= inodedep
->id_savedsize
;
3704 inodedep
->id_savedsize
= -1;
3706 * If there were any rollbacks in the inode block, then it must be
3707 * marked dirty so that its will eventually get written back in
3713 * Process any allocdirects that completed during the update.
3715 if ((adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
)) != NULL
)
3716 handle_allocdirect_partdone(adp
);
3718 * Process deallocations that were held pending until the
3719 * inode had been written to disk. Freeing of the inode
3720 * is delayed until after all blocks have been freed to
3721 * avoid creation of new <vfsid, inum, lbn> triples
3722 * before the old ones have been deleted.
3725 while ((wk
= LIST_FIRST(&inodedep
->id_bufwait
)) != NULL
) {
3726 WORKLIST_REMOVE(wk
);
3727 switch (wk
->wk_type
) {
3731 * We defer adding filefree to the worklist until
3732 * all other additions have been made to ensure
3733 * that it will be done after all the old blocks
3736 if (filefree
!= NULL
) {
3737 lk
.lkt_held
= NOHOLDER
;
3738 panic("handle_written_inodeblock: filefree");
3744 handle_written_mkdir(WK_MKDIR(wk
), MKDIR_PARENT
);
3748 diradd_inode_written(WK_DIRADD(wk
), inodedep
);
3752 wk
->wk_state
|= COMPLETE
;
3753 if ((wk
->wk_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3755 /* -- fall through -- */
3758 add_to_worklist(wk
);
3762 lk
.lkt_held
= NOHOLDER
;
3763 panic("handle_written_inodeblock: Unknown type %s",
3764 TYPENAME(wk
->wk_type
));
3768 if (filefree
!= NULL
) {
3769 if (free_inodedep(inodedep
) == 0) {
3770 lk
.lkt_held
= NOHOLDER
;
3771 panic("handle_written_inodeblock: live inodedep");
3773 add_to_worklist(filefree
);
3778 * If no outstanding dependencies, free it.
3780 if (free_inodedep(inodedep
) || TAILQ_FIRST(&inodedep
->id_inoupdt
) == 0)
3782 return (hadchanges
);
3786 * Process a diradd entry after its dependent inode has been written.
3787 * This routine must be called with splbio interrupts blocked.
3790 diradd_inode_written(struct diradd
*dap
, struct inodedep
*inodedep
)
3792 struct pagedep
*pagedep
;
3794 dap
->da_state
|= COMPLETE
;
3795 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3796 if (dap
->da_state
& DIRCHG
)
3797 pagedep
= dap
->da_previous
->dm_pagedep
;
3799 pagedep
= dap
->da_pagedep
;
3800 LIST_REMOVE(dap
, da_pdlist
);
3801 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
3803 WORKLIST_INSERT(&inodedep
->id_pendinghd
, &dap
->da_list
);
3807 * Handle the completion of a mkdir dependency.
3810 handle_written_mkdir(struct mkdir
*mkdir
, int type
)
3813 struct pagedep
*pagedep
;
3815 if (mkdir
->md_state
!= type
) {
3816 lk
.lkt_held
= NOHOLDER
;
3817 panic("handle_written_mkdir: bad type");
3819 dap
= mkdir
->md_diradd
;
3820 dap
->da_state
&= ~type
;
3821 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) == 0)
3822 dap
->da_state
|= DEPCOMPLETE
;
3823 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3824 if (dap
->da_state
& DIRCHG
)
3825 pagedep
= dap
->da_previous
->dm_pagedep
;
3827 pagedep
= dap
->da_pagedep
;
3828 LIST_REMOVE(dap
, da_pdlist
);
3829 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
3831 LIST_REMOVE(mkdir
, md_mkdirs
);
3832 WORKITEM_FREE(mkdir
, D_MKDIR
);
3836 * Called from within softdep_disk_write_complete above.
3837 * A write operation was just completed. Removed inodes can
3838 * now be freed and associated block pointers may be committed.
3839 * Note that this routine is always called from interrupt level
3840 * with further splbio interrupts blocked.
3843 * bp: buffer containing the written page
3846 handle_written_filepage(struct pagedep
*pagedep
, struct buf
*bp
)
3848 struct dirrem
*dirrem
;
3849 struct diradd
*dap
, *nextdap
;
3853 if ((pagedep
->pd_state
& IOSTARTED
) == 0) {
3854 lk
.lkt_held
= NOHOLDER
;
3855 panic("handle_written_filepage: not started");
3857 pagedep
->pd_state
&= ~IOSTARTED
;
3859 * Process any directory removals that have been committed.
3861 while ((dirrem
= LIST_FIRST(&pagedep
->pd_dirremhd
)) != NULL
) {
3862 LIST_REMOVE(dirrem
, dm_next
);
3863 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
3864 add_to_worklist(&dirrem
->dm_list
);
3867 * Free any directory additions that have been committed.
3869 while ((dap
= LIST_FIRST(&pagedep
->pd_pendinghd
)) != NULL
)
3872 * Uncommitted directory entries must be restored.
3874 for (chgs
= 0, i
= 0; i
< DAHASHSZ
; i
++) {
3875 for (dap
= LIST_FIRST(&pagedep
->pd_diraddhd
[i
]); dap
;
3877 nextdap
= LIST_NEXT(dap
, da_pdlist
);
3878 if (dap
->da_state
& ATTACHED
) {
3879 lk
.lkt_held
= NOHOLDER
;
3880 panic("handle_written_filepage: attached");
3882 ep
= (struct direct
*)
3883 ((char *)bp
->b_data
+ dap
->da_offset
);
3884 ep
->d_ino
= dap
->da_newinum
;
3885 dap
->da_state
&= ~UNDONE
;
3886 dap
->da_state
|= ATTACHED
;
3889 * If the inode referenced by the directory has
3890 * been written out, then the dependency can be
3891 * moved to the pending list.
3893 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3894 LIST_REMOVE(dap
, da_pdlist
);
3895 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
,
3901 * If there were any rollbacks in the directory, then it must be
3902 * marked dirty so that its will eventually get written back in
3906 if ((bp
->b_flags
& B_DELWRI
) == 0)
3911 * If no dependencies remain, the pagedep will be freed.
3912 * Otherwise it will remain to update the page before it
3913 * is written back to disk.
3915 if (LIST_FIRST(&pagedep
->pd_pendinghd
) == 0) {
3916 for (i
= 0; i
< DAHASHSZ
; i
++)
3917 if (LIST_FIRST(&pagedep
->pd_diraddhd
[i
]) != NULL
)
3919 if (i
== DAHASHSZ
) {
3920 LIST_REMOVE(pagedep
, pd_hash
);
3921 WORKITEM_FREE(pagedep
, D_PAGEDEP
);
3929 * Writing back in-core inode structures.
3931 * The filesystem only accesses an inode's contents when it occupies an
3932 * "in-core" inode structure. These "in-core" structures are separate from
3933 * the page frames used to cache inode blocks. Only the latter are
3934 * transferred to/from the disk. So, when the updated contents of the
3935 * "in-core" inode structure are copied to the corresponding in-memory inode
3936 * block, the dependencies are also transferred. The following procedure is
3937 * called when copying a dirty "in-core" inode to a cached inode block.
3941 * Called when an inode is loaded from disk. If the effective link count
3942 * differed from the actual link count when it was last flushed, then we
3943 * need to ensure that the correct effective link count is put back.
3946 * ip: the "in_core" copy of the inode
3949 softdep_load_inodeblock(struct inode
*ip
)
3951 struct inodedep
*inodedep
;
3954 * Check for alternate nlink count.
3956 ip
->i_effnlink
= ip
->i_nlink
;
3958 if (inodedep_lookup(ip
->i_fs
, ip
->i_number
, 0, &inodedep
) == 0) {
3962 ip
->i_effnlink
-= inodedep
->id_nlinkdelta
;
3967 * This routine is called just before the "in-core" inode
3968 * information is to be copied to the in-memory inode block.
3969 * Recall that an inode block contains several inodes. If
3970 * the force flag is set, then the dependencies will be
3971 * cleared so that the update can always be made. Note that
3972 * the buffer is locked when this routine is called, so we
3973 * will never be in the middle of writing the inode block
3977 * ip: the "in_core" copy of the inode
3978 * bp: the buffer containing the inode block
3979 * waitfor: nonzero => update must be allowed
3982 softdep_update_inodeblock(struct inode
*ip
, struct buf
*bp
,
3985 struct inodedep
*inodedep
;
3986 struct worklist
*wk
;
3990 * If the effective link count is not equal to the actual link
3991 * count, then we must track the difference in an inodedep while
3992 * the inode is (potentially) tossed out of the cache. Otherwise,
3993 * if there is no existing inodedep, then there are no dependencies
3997 if (inodedep_lookup(ip
->i_fs
, ip
->i_number
, 0, &inodedep
) == 0) {
3999 if (ip
->i_effnlink
!= ip
->i_nlink
)
4000 panic("softdep_update_inodeblock: bad link count");
4003 if (inodedep
->id_nlinkdelta
!= ip
->i_nlink
- ip
->i_effnlink
) {
4005 panic("softdep_update_inodeblock: bad delta");
4008 * Changes have been initiated. Anything depending on these
4009 * changes cannot occur until this inode has been written.
4011 inodedep
->id_state
&= ~COMPLETE
;
4012 if ((inodedep
->id_state
& ONWORKLIST
) == 0)
4013 WORKLIST_INSERT_BP(bp
, &inodedep
->id_list
);
4015 * Any new dependencies associated with the incore inode must
4016 * now be moved to the list associated with the buffer holding
4017 * the in-memory copy of the inode. Once merged process any
4018 * allocdirects that are completed by the merger.
4020 merge_inode_lists(inodedep
);
4021 if (TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
)
4022 handle_allocdirect_partdone(TAILQ_FIRST(&inodedep
->id_inoupdt
));
4024 * Now that the inode has been pushed into the buffer, the
4025 * operations dependent on the inode being written to disk
4026 * can be moved to the id_bufwait so that they will be
4027 * processed when the buffer I/O completes.
4029 while ((wk
= LIST_FIRST(&inodedep
->id_inowait
)) != NULL
) {
4030 WORKLIST_REMOVE(wk
);
4031 WORKLIST_INSERT(&inodedep
->id_bufwait
, wk
);
4034 * Newly allocated inodes cannot be written until the bitmap
4035 * that allocates them have been written (indicated by
4036 * DEPCOMPLETE being set in id_state). If we are doing a
4037 * forced sync (e.g., an fsync on a file), we force the bitmap
4038 * to be written so that the update can be done.
4040 if ((inodedep
->id_state
& DEPCOMPLETE
) != 0 || waitfor
== 0) {
4044 gotit
= getdirtybuf(&inodedep
->id_buf
, MNT_WAIT
);
4047 (error
= bwrite(inodedep
->id_buf
)) != 0)
4048 softdep_error("softdep_update_inodeblock: bwrite", error
);
4052 * Merge the new inode dependency list (id_newinoupdt) into the old
4053 * inode dependency list (id_inoupdt). This routine must be called
4054 * with splbio interrupts blocked.
4057 merge_inode_lists(struct inodedep
*inodedep
)
4059 struct allocdirect
*listadp
, *newadp
;
4061 newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
);
4062 for (listadp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); listadp
&& newadp
;) {
4063 if (listadp
->ad_lbn
< newadp
->ad_lbn
) {
4064 listadp
= TAILQ_NEXT(listadp
, ad_next
);
4067 TAILQ_REMOVE(&inodedep
->id_newinoupdt
, newadp
, ad_next
);
4068 TAILQ_INSERT_BEFORE(listadp
, newadp
, ad_next
);
4069 if (listadp
->ad_lbn
== newadp
->ad_lbn
) {
4070 allocdirect_merge(&inodedep
->id_inoupdt
, newadp
,
4074 newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
);
4076 while ((newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
)) != NULL
) {
4077 TAILQ_REMOVE(&inodedep
->id_newinoupdt
, newadp
, ad_next
);
4078 TAILQ_INSERT_TAIL(&inodedep
->id_inoupdt
, newadp
, ad_next
);
4083 * If we are doing an fsync, then we must ensure that any directory
4084 * entries for the inode have been written after the inode gets to disk.
4087 * vp: the "in_core" copy of the inode
4090 softdep_fsync(struct vnode
*vp
)
4092 struct inodedep
*inodedep
;
4093 struct pagedep
*pagedep
;
4094 struct worklist
*wk
;
4101 int error
, flushparent
;
4106 * Move check from original kernel code, possibly not needed any
4107 * more with the per-mount bioops.
4109 if ((vp
->v_mount
->mnt_flag
& MNT_SOFTDEP
) == 0)
4115 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) == 0) {
4119 if (LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
4120 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
4121 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
4122 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
) {
4124 panic("softdep_fsync: pending ops");
4126 for (error
= 0, flushparent
= 0; ; ) {
4127 if ((wk
= LIST_FIRST(&inodedep
->id_pendinghd
)) == NULL
)
4129 if (wk
->wk_type
!= D_DIRADD
) {
4131 panic("softdep_fsync: Unexpected type %s",
4132 TYPENAME(wk
->wk_type
));
4134 dap
= WK_DIRADD(wk
);
4136 * Flush our parent if this directory entry
4137 * has a MKDIR_PARENT dependency.
4139 if (dap
->da_state
& DIRCHG
)
4140 pagedep
= dap
->da_previous
->dm_pagedep
;
4142 pagedep
= dap
->da_pagedep
;
4143 mnt
= pagedep
->pd_mnt
;
4144 parentino
= pagedep
->pd_ino
;
4145 lbn
= pagedep
->pd_lbn
;
4146 if ((dap
->da_state
& (MKDIR_BODY
| COMPLETE
)) != COMPLETE
) {
4148 panic("softdep_fsync: dirty");
4150 flushparent
= dap
->da_state
& MKDIR_PARENT
;
4152 * If we are being fsync'ed as part of vgone'ing this vnode,
4153 * then we will not be able to release and recover the
4154 * vnode below, so we just have to give up on writing its
4155 * directory entry out. It will eventually be written, just
4156 * not now, but then the user was not asking to have it
4157 * written, so we are not breaking any promises.
4159 if (vp
->v_flag
& VRECLAIMED
)
4162 * We prevent deadlock by always fetching inodes from the
4163 * root, moving down the directory tree. Thus, when fetching
4164 * our parent directory, we must unlock ourselves before
4165 * requesting the lock on our parent. See the comment in
4166 * ufs_lookup for details on possible races.
4170 error
= VFS_VGET(mnt
, parentino
, &pvp
);
4171 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
4175 if ((error
= ffs_update(pvp
, 1)) != 0) {
4181 * Flush directory page containing the inode's name.
4183 error
= bread(pvp
, lblktodoff(fs
, lbn
), blksize(fs
, VTOI(pvp
), lbn
), &bp
);
4190 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) == 0)
4198 * Flush all the dirty bitmaps associated with the block device
4199 * before flushing the rest of the dirty blocks so as to reduce
4200 * the number of dependencies that will have to be rolled back.
4202 static int softdep_fsync_mountdev_bp(struct buf
*bp
, void *data
);
4205 softdep_fsync_mountdev(struct vnode
*vp
)
4207 if (!vn_isdisk(vp
, NULL
))
4208 panic("softdep_fsync_mountdev: vnode not a disk");
4210 RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
4211 softdep_fsync_mountdev_bp
, vp
);
4212 drain_output(vp
, 1);
4217 softdep_fsync_mountdev_bp(struct buf
*bp
, void *data
)
4219 struct worklist
*wk
;
4220 struct vnode
*vp
= data
;
4223 * If it is already scheduled, skip to the next buffer.
4225 if (BUF_LOCK(bp
, LK_EXCLUSIVE
| LK_NOWAIT
))
4227 if (bp
->b_vp
!= vp
|| (bp
->b_flags
& B_DELWRI
) == 0) {
4229 kprintf("softdep_fsync_mountdev_bp: warning, buffer %p ripped out from under vnode %p\n", bp
, vp
);
4233 * We are only interested in bitmaps with outstanding
4236 if ((wk
= LIST_FIRST(&bp
->b_dep
)) == NULL
||
4237 wk
->wk_type
!= D_BMSAFEMAP
) {
4249 * This routine is called when we are trying to synchronously flush a
4250 * file. This routine must eliminate any filesystem metadata dependencies
4251 * so that the syncing routine can succeed by pushing the dirty blocks
4252 * associated with the file. If any I/O errors occur, they are returned.
4254 struct softdep_sync_metadata_info
{
4259 static int softdep_sync_metadata_bp(struct buf
*bp
, void *data
);
4262 softdep_sync_metadata(struct vnode
*vp
, struct thread
*td
)
4264 struct softdep_sync_metadata_info info
;
4268 * Check whether this vnode is involved in a filesystem
4269 * that is doing soft dependency processing.
4271 if (!vn_isdisk(vp
, NULL
)) {
4272 if (!DOINGSOFTDEP(vp
))
4275 if (vp
->v_rdev
->si_mountpoint
== NULL
||
4276 (vp
->v_rdev
->si_mountpoint
->mnt_flag
& MNT_SOFTDEP
) == 0)
4279 * Ensure that any direct block dependencies have been cleared.
4282 if ((error
= flush_inodedep_deps(VTOI(vp
)->i_fs
, VTOI(vp
)->i_number
))) {
4287 * For most files, the only metadata dependencies are the
4288 * cylinder group maps that allocate their inode or blocks.
4289 * The block allocation dependencies can be found by traversing
4290 * the dependency lists for any buffers that remain on their
4291 * dirty buffer list. The inode allocation dependency will
4292 * be resolved when the inode is updated with MNT_WAIT.
4293 * This work is done in two passes. The first pass grabs most
4294 * of the buffers and begins asynchronously writing them. The
4295 * only way to wait for these asynchronous writes is to sleep
4296 * on the filesystem vnode which may stay busy for a long time
4297 * if the filesystem is active. So, instead, we make a second
4298 * pass over the dependencies blocking on each write. In the
4299 * usual case we will be blocking against a write that we
4300 * initiated, so when it is done the dependency will have been
4301 * resolved. Thus the second pass is expected to end quickly.
4303 waitfor
= MNT_NOWAIT
;
4306 * We must wait for any I/O in progress to finish so that
4307 * all potential buffers on the dirty list will be visible.
4309 drain_output(vp
, 1);
4311 info
.waitfor
= waitfor
;
4312 error
= RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
4313 softdep_sync_metadata_bp
, &info
);
4316 return(-error
); /* error code */
4320 * The brief unlock is to allow any pent up dependency
4321 * processing to be done. Then proceed with the second pass.
4323 if (waitfor
== MNT_NOWAIT
) {
4331 * If we have managed to get rid of all the dirty buffers,
4332 * then we are done. For certain directories and block
4333 * devices, we may need to do further work.
4335 * We must wait for any I/O in progress to finish so that
4336 * all potential buffers on the dirty list will be visible.
4338 drain_output(vp
, 1);
4339 if (RB_EMPTY(&vp
->v_rbdirty_tree
)) {
4346 * If we are trying to sync a block device, some of its buffers may
4347 * contain metadata that cannot be written until the contents of some
4348 * partially written files have been written to disk. The only easy
4349 * way to accomplish this is to sync the entire filesystem (luckily
4350 * this happens rarely).
4352 if (vn_isdisk(vp
, NULL
) &&
4354 vp
->v_rdev
->si_mountpoint
&& !vn_islocked(vp
) &&
4355 (error
= VFS_SYNC(vp
->v_rdev
->si_mountpoint
, MNT_WAIT
)) != 0)
4361 softdep_sync_metadata_bp(struct buf
*bp
, void *data
)
4363 struct softdep_sync_metadata_info
*info
= data
;
4364 struct pagedep
*pagedep
;
4365 struct allocdirect
*adp
;
4366 struct allocindir
*aip
;
4367 struct worklist
*wk
;
4372 if (getdirtybuf(&bp
, MNT_WAIT
) == 0) {
4373 kprintf("softdep_sync_metadata_bp(1): caught buf %p going away\n", bp
);
4376 if (bp
->b_vp
!= info
->vp
|| (bp
->b_flags
& B_DELWRI
) == 0) {
4377 kprintf("softdep_sync_metadata_bp(2): caught buf %p going away vp %p\n", bp
, info
->vp
);
4383 * As we hold the buffer locked, none of its dependencies
4386 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
4387 switch (wk
->wk_type
) {
4390 adp
= WK_ALLOCDIRECT(wk
);
4391 if (adp
->ad_state
& DEPCOMPLETE
)
4394 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4397 if (info
->waitfor
== MNT_NOWAIT
) {
4399 } else if ((error
= bwrite(nbp
)) != 0) {
4408 aip
= WK_ALLOCINDIR(wk
);
4409 if (aip
->ai_state
& DEPCOMPLETE
)
4412 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4415 if (info
->waitfor
== MNT_NOWAIT
) {
4417 } else if ((error
= bwrite(nbp
)) != 0) {
4428 LIST_FOREACH(aip
, &WK_INDIRDEP(wk
)->ir_deplisthd
, ai_next
) {
4429 if (aip
->ai_state
& DEPCOMPLETE
)
4432 if (getdirtybuf(&nbp
, MNT_WAIT
) == 0)
4435 if ((error
= bwrite(nbp
)) != 0) {
4446 if ((error
= flush_inodedep_deps(WK_INODEDEP(wk
)->id_fs
,
4447 WK_INODEDEP(wk
)->id_ino
)) != 0) {
4457 * We are trying to sync a directory that may
4458 * have dependencies on both its own metadata
4459 * and/or dependencies on the inodes of any
4460 * recently allocated files. We walk its diradd
4461 * lists pushing out the associated inode.
4463 pagedep
= WK_PAGEDEP(wk
);
4464 for (i
= 0; i
< DAHASHSZ
; i
++) {
4465 if (LIST_FIRST(&pagedep
->pd_diraddhd
[i
]) == 0)
4468 flush_pagedep_deps(info
->vp
,
4470 &pagedep
->pd_diraddhd
[i
]))) {
4481 * This case should never happen if the vnode has
4482 * been properly sync'ed. However, if this function
4483 * is used at a place where the vnode has not yet
4484 * been sync'ed, this dependency can show up. So,
4485 * rather than panic, just flush it.
4487 nbp
= WK_MKDIR(wk
)->md_buf
;
4488 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4491 if (info
->waitfor
== MNT_NOWAIT
) {
4493 } else if ((error
= bwrite(nbp
)) != 0) {
4503 * This case should never happen if the vnode has
4504 * been properly sync'ed. However, if this function
4505 * is used at a place where the vnode has not yet
4506 * been sync'ed, this dependency can show up. So,
4507 * rather than panic, just flush it.
4509 * nbp can wind up == bp if a device node for the
4510 * same filesystem is being fsynced at the same time,
4511 * leading to a panic if we don't catch the case.
4513 nbp
= WK_BMSAFEMAP(wk
)->sm_buf
;
4516 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4519 if (info
->waitfor
== MNT_NOWAIT
) {
4521 } else if ((error
= bwrite(nbp
)) != 0) {
4531 panic("softdep_sync_metadata: Unknown type %s",
4532 TYPENAME(wk
->wk_type
));
4543 * Flush the dependencies associated with an inodedep.
4544 * Called with splbio blocked.
4547 flush_inodedep_deps(struct fs
*fs
, ino_t ino
)
4549 struct inodedep
*inodedep
;
4550 struct allocdirect
*adp
;
4555 * This work is done in two passes. The first pass grabs most
4556 * of the buffers and begins asynchronously writing them. The
4557 * only way to wait for these asynchronous writes is to sleep
4558 * on the filesystem vnode which may stay busy for a long time
4559 * if the filesystem is active. So, instead, we make a second
4560 * pass over the dependencies blocking on each write. In the
4561 * usual case we will be blocking against a write that we
4562 * initiated, so when it is done the dependency will have been
4563 * resolved. Thus the second pass is expected to end quickly.
4564 * We give a brief window at the top of the loop to allow
4565 * any pending I/O to complete.
4567 for (waitfor
= MNT_NOWAIT
; ; ) {
4570 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) == 0)
4572 TAILQ_FOREACH(adp
, &inodedep
->id_inoupdt
, ad_next
) {
4573 if (adp
->ad_state
& DEPCOMPLETE
)
4576 if (getdirtybuf(&bp
, waitfor
) == 0) {
4577 if (waitfor
== MNT_NOWAIT
)
4582 if (waitfor
== MNT_NOWAIT
) {
4584 } else if ((error
= bwrite(bp
)) != 0) {
4593 TAILQ_FOREACH(adp
, &inodedep
->id_newinoupdt
, ad_next
) {
4594 if (adp
->ad_state
& DEPCOMPLETE
)
4597 if (getdirtybuf(&bp
, waitfor
) == 0) {
4598 if (waitfor
== MNT_NOWAIT
)
4603 if (waitfor
== MNT_NOWAIT
) {
4605 } else if ((error
= bwrite(bp
)) != 0) {
4615 * If pass2, we are done, otherwise do pass 2.
4617 if (waitfor
== MNT_WAIT
)
4622 * Try freeing inodedep in case all dependencies have been removed.
4624 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) != 0)
4625 (void) free_inodedep(inodedep
);
4630 * Eliminate a pagedep dependency by flushing out all its diradd dependencies.
4631 * Called with splbio blocked.
4634 flush_pagedep_deps(struct vnode
*pvp
, struct mount
*mp
,
4635 struct diraddhd
*diraddhdp
)
4637 struct inodedep
*inodedep
;
4638 struct ufsmount
*ump
;
4641 int gotit
, error
= 0;
4646 while ((dap
= LIST_FIRST(diraddhdp
)) != NULL
) {
4648 * Flush ourselves if this directory entry
4649 * has a MKDIR_PARENT dependency.
4651 if (dap
->da_state
& MKDIR_PARENT
) {
4653 if ((error
= ffs_update(pvp
, 1)) != 0)
4657 * If that cleared dependencies, go on to next.
4659 if (dap
!= LIST_FIRST(diraddhdp
))
4661 if (dap
->da_state
& MKDIR_PARENT
) {
4663 panic("flush_pagedep_deps: MKDIR_PARENT");
4667 * A newly allocated directory must have its "." and
4668 * ".." entries written out before its name can be
4669 * committed in its parent. We do not want or need
4670 * the full semantics of a synchronous VOP_FSYNC as
4671 * that may end up here again, once for each directory
4672 * level in the filesystem. Instead, we push the blocks
4673 * and wait for them to clear. We have to fsync twice
4674 * because the first call may choose to defer blocks
4675 * that still have dependencies, but deferral will
4676 * happen at most once.
4678 inum
= dap
->da_newinum
;
4679 if (dap
->da_state
& MKDIR_BODY
) {
4681 if ((error
= VFS_VGET(mp
, inum
, &vp
)) != 0)
4683 if ((error
=VOP_FSYNC(vp
, MNT_NOWAIT
)) ||
4684 (error
=VOP_FSYNC(vp
, MNT_NOWAIT
))) {
4688 drain_output(vp
, 0);
4692 * If that cleared dependencies, go on to next.
4694 if (dap
!= LIST_FIRST(diraddhdp
))
4696 if (dap
->da_state
& MKDIR_BODY
) {
4698 panic("flush_pagedep_deps: MKDIR_BODY");
4702 * Flush the inode on which the directory entry depends.
4703 * Having accounted for MKDIR_PARENT and MKDIR_BODY above,
4704 * the only remaining dependency is that the updated inode
4705 * count must get pushed to disk. The inode has already
4706 * been pushed into its inode buffer (via VOP_UPDATE) at
4707 * the time of the reference count change. So we need only
4708 * locate that buffer, ensure that there will be no rollback
4709 * caused by a bitmap dependency, then write the inode buffer.
4711 if (inodedep_lookup(ump
->um_fs
, inum
, 0, &inodedep
) == 0) {
4713 panic("flush_pagedep_deps: lost inode");
4716 * If the inode still has bitmap dependencies,
4717 * push them to disk.
4719 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
4720 gotit
= getdirtybuf(&inodedep
->id_buf
, MNT_WAIT
);
4722 if (gotit
&& (error
= bwrite(inodedep
->id_buf
)) != 0)
4725 if (dap
!= LIST_FIRST(diraddhdp
))
4729 * If the inode is still sitting in a buffer waiting
4730 * to be written, push it to disk.
4733 if ((error
= bread(ump
->um_devvp
,
4734 fsbtodoff(ump
->um_fs
, ino_to_fsba(ump
->um_fs
, inum
)),
4735 (int)ump
->um_fs
->fs_bsize
, &bp
)) != 0)
4737 if ((error
= bwrite(bp
)) != 0)
4741 * If we have failed to get rid of all the dependencies
4742 * then something is seriously wrong.
4744 if (dap
== LIST_FIRST(diraddhdp
)) {
4746 panic("flush_pagedep_deps: flush failed");
4755 * A large burst of file addition or deletion activity can drive the
4756 * memory load excessively high. First attempt to slow things down
4757 * using the techniques below. If that fails, this routine requests
4758 * the offending operations to fall back to running synchronously
4759 * until the memory load returns to a reasonable level.
4762 softdep_slowdown(struct vnode
*vp
)
4764 int max_softdeps_hard
;
4766 max_softdeps_hard
= max_softdeps
* 11 / 10;
4767 if (num_dirrem
< max_softdeps_hard
/ 2 &&
4768 num_inodedep
< max_softdeps_hard
)
4770 stat_sync_limit_hit
+= 1;
4775 * If memory utilization has gotten too high, deliberately slow things
4776 * down and speed up the I/O processing.
4779 request_cleanup(int resource
, int islocked
)
4781 struct thread
*td
= curthread
; /* XXX */
4784 * We never hold up the filesystem syncer process.
4786 if (td
== filesys_syncer
)
4789 * First check to see if the work list has gotten backlogged.
4790 * If it has, co-opt this process to help clean up two entries.
4791 * Because this process may hold inodes locked, we cannot
4792 * handle any remove requests that might block on a locked
4793 * inode as that could lead to deadlock.
4795 if (num_on_worklist
> max_softdeps
/ 10) {
4798 process_worklist_item(NULL
, LK_NOWAIT
);
4799 process_worklist_item(NULL
, LK_NOWAIT
);
4800 stat_worklist_push
+= 2;
4807 * If we are resource constrained on inode dependencies, try
4808 * flushing some dirty inodes. Otherwise, we are constrained
4809 * by file deletions, so try accelerating flushes of directories
4810 * with removal dependencies. We would like to do the cleanup
4811 * here, but we probably hold an inode locked at this point and
4812 * that might deadlock against one that we try to clean. So,
4813 * the best that we can do is request the syncer daemon to do
4814 * the cleanup for us.
4819 stat_ino_limit_push
+= 1;
4820 req_clear_inodedeps
+= 1;
4821 stat_countp
= &stat_ino_limit_hit
;
4825 stat_blk_limit_push
+= 1;
4826 req_clear_remove
+= 1;
4827 stat_countp
= &stat_blk_limit_hit
;
4833 panic("request_cleanup: unknown type");
4836 * Hopefully the syncer daemon will catch up and awaken us.
4837 * We wait at most tickdelay before proceeding in any case.
4842 if (!callout_active(&handle
))
4843 callout_reset(&handle
, tickdelay
> 2 ? tickdelay
: 2,
4845 interlocked_sleep(&lk
, SLEEP
, (caddr_t
)&proc_waiting
, 0,
4854 * Awaken processes pausing in request_cleanup and clear proc_waiting
4855 * to indicate that there is no longer a timer running.
4858 pause_timer(void *arg
)
4861 wakeup_one(&proc_waiting
);
4862 if (proc_waiting
> 0)
4863 callout_reset(&handle
, tickdelay
> 2 ? tickdelay
: 2,
4866 callout_deactivate(&handle
);
4870 * Flush out a directory with at least one removal dependency in an effort to
4871 * reduce the number of dirrem, freefile, and freeblks dependency structures.
4874 clear_remove(struct thread
*td
)
4876 struct pagedep_hashhead
*pagedephd
;
4877 struct pagedep
*pagedep
;
4878 static int next
= 0;
4885 for (cnt
= 0; cnt
< pagedep_hash
; cnt
++) {
4886 pagedephd
= &pagedep_hashtbl
[next
++];
4887 if (next
>= pagedep_hash
)
4889 LIST_FOREACH(pagedep
, pagedephd
, pd_hash
) {
4890 if (LIST_FIRST(&pagedep
->pd_dirremhd
) == NULL
)
4892 mp
= pagedep
->pd_mnt
;
4893 ino
= pagedep
->pd_ino
;
4895 if ((error
= VFS_VGET(mp
, ino
, &vp
)) != 0) {
4896 softdep_error("clear_remove: vget", error
);
4899 if ((error
= VOP_FSYNC(vp
, MNT_NOWAIT
)))
4900 softdep_error("clear_remove: fsync", error
);
4901 drain_output(vp
, 0);
4910 * Clear out a block of dirty inodes in an effort to reduce
4911 * the number of inodedep dependency structures.
4913 struct clear_inodedeps_info
{
4919 clear_inodedeps_mountlist_callback(struct mount
*mp
, void *data
)
4921 struct clear_inodedeps_info
*info
= data
;
4923 if ((mp
->mnt_flag
& MNT_SOFTDEP
) && info
->fs
== VFSTOUFS(mp
)->um_fs
) {
4931 clear_inodedeps(struct thread
*td
)
4933 struct clear_inodedeps_info info
;
4934 struct inodedep_hashhead
*inodedephd
;
4935 struct inodedep
*inodedep
;
4936 static int next
= 0;
4940 ino_t firstino
, lastino
, ino
;
4944 * Pick a random inode dependency to be cleared.
4945 * We will then gather up all the inodes in its block
4946 * that have dependencies and flush them out.
4948 for (cnt
= 0; cnt
< inodedep_hash
; cnt
++) {
4949 inodedephd
= &inodedep_hashtbl
[next
++];
4950 if (next
>= inodedep_hash
)
4952 if ((inodedep
= LIST_FIRST(inodedephd
)) != NULL
)
4955 if (inodedep
== NULL
) {
4960 * Ugly code to find mount point given pointer to superblock.
4962 fs
= inodedep
->id_fs
;
4965 mountlist_scan(clear_inodedeps_mountlist_callback
,
4966 &info
, MNTSCAN_FORWARD
|MNTSCAN_NOBUSY
);
4968 * Find the last inode in the block with dependencies.
4970 firstino
= inodedep
->id_ino
& ~(INOPB(fs
) - 1);
4971 for (lastino
= firstino
+ INOPB(fs
) - 1; lastino
> firstino
; lastino
--)
4972 if (inodedep_lookup(fs
, lastino
, 0, &inodedep
) != 0)
4975 * Asynchronously push all but the last inode with dependencies.
4976 * Synchronously push the last inode with dependencies to ensure
4977 * that the inode block gets written to free up the inodedeps.
4979 for (ino
= firstino
; ino
<= lastino
; ino
++) {
4980 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) == 0)
4983 if ((error
= VFS_VGET(info
.mp
, ino
, &vp
)) != 0) {
4984 softdep_error("clear_inodedeps: vget", error
);
4987 if (ino
== lastino
) {
4988 if ((error
= VOP_FSYNC(vp
, MNT_WAIT
)))
4989 softdep_error("clear_inodedeps: fsync1", error
);
4991 if ((error
= VOP_FSYNC(vp
, MNT_NOWAIT
)))
4992 softdep_error("clear_inodedeps: fsync2", error
);
4993 drain_output(vp
, 0);
5002 * Function to determine if the buffer has outstanding dependencies
5003 * that will cause a roll-back if the buffer is written. If wantcount
5004 * is set, return number of dependencies, otherwise just yes or no.
5007 softdep_count_dependencies(struct buf
*bp
, int wantcount
)
5009 struct worklist
*wk
;
5010 struct inodedep
*inodedep
;
5011 struct indirdep
*indirdep
;
5012 struct allocindir
*aip
;
5013 struct pagedep
*pagedep
;
5019 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
5020 switch (wk
->wk_type
) {
5023 inodedep
= WK_INODEDEP(wk
);
5024 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
5025 /* bitmap allocation dependency */
5030 if (TAILQ_FIRST(&inodedep
->id_inoupdt
)) {
5031 /* direct block pointer dependency */
5039 indirdep
= WK_INDIRDEP(wk
);
5041 LIST_FOREACH(aip
, &indirdep
->ir_deplisthd
, ai_next
) {
5042 /* indirect block pointer dependency */
5050 pagedep
= WK_PAGEDEP(wk
);
5051 for (i
= 0; i
< DAHASHSZ
; i
++) {
5053 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[i
], da_pdlist
) {
5054 /* directory entry dependency */
5066 /* never a dependency on these blocks */
5071 panic("softdep_check_for_rollback: Unexpected type %s",
5072 TYPENAME(wk
->wk_type
));
5082 * Acquire exclusive access to a buffer.
5083 * Must be called with splbio blocked.
5084 * Return 1 if buffer was acquired.
5087 getdirtybuf(struct buf
**bpp
, int waitfor
)
5093 if ((bp
= *bpp
) == NULL
)
5095 if (BUF_LOCK(bp
, LK_EXCLUSIVE
| LK_NOWAIT
) == 0)
5097 if (waitfor
!= MNT_WAIT
)
5099 error
= interlocked_sleep(&lk
, LOCKBUF
, bp
,
5100 LK_EXCLUSIVE
| LK_SLEEPFAIL
, 0, 0);
5101 if (error
!= ENOLCK
) {
5103 panic("getdirtybuf: inconsistent lock");
5106 if ((bp
->b_flags
& B_DELWRI
) == 0) {
5115 * Wait for pending output on a vnode to complete.
5116 * Must be called with vnode locked.
5119 drain_output(struct vnode
*vp
, int islocked
)
5124 while (vp
->v_track_write
.bk_active
) {
5125 vp
->v_track_write
.bk_waitflag
= 1;
5126 interlocked_sleep(&lk
, SLEEP
, &vp
->v_track_write
,
5134 * Called whenever a buffer that is being invalidated or reallocated
5135 * contains dependencies. This should only happen if an I/O error has
5136 * occurred. The routine is called with the buffer locked.
5139 softdep_deallocate_dependencies(struct buf
*bp
)
5141 if ((bp
->b_flags
& B_ERROR
) == 0)
5142 panic("softdep_deallocate_dependencies: dangling deps");
5143 softdep_error(bp
->b_vp
->v_mount
->mnt_stat
.f_mntfromname
, bp
->b_error
);
5144 panic("softdep_deallocate_dependencies: unrecovered I/O error");
5148 * Function to handle asynchronous write errors in the filesystem.
5151 softdep_error(char *func
, int error
)
5154 /* XXX should do something better! */
5155 kprintf("%s: got error %d while accessing filesystem\n", func
, error
);