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 $
43 * For now we want the safety net that the DIAGNOSTIC and DEBUG flags provide.
52 #include <sys/param.h>
53 #include <sys/kernel.h>
54 #include <sys/systm.h>
56 #include <sys/malloc.h>
57 #include <sys/mount.h>
59 #include <sys/spinlock2.h>
60 #include <sys/syslog.h>
61 #include <sys/vnode.h>
63 #include <machine/inttypes.h>
70 #include "ffs_extern.h"
71 #include "ufs_extern.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 int request_cleanup(int);
193 static int process_worklist_item(struct mount
*, int);
194 static void add_to_worklist(struct worklist
*);
197 * Exported softdep operations.
199 static void softdep_disk_io_initiation(struct buf
*);
200 static void softdep_disk_write_complete(struct buf
*);
201 static void softdep_deallocate_dependencies(struct buf
*);
202 static int softdep_fsync(struct vnode
*);
203 static int softdep_process_worklist(struct mount
*);
204 static void softdep_move_dependencies(struct buf
*, struct buf
*);
205 static int softdep_count_dependencies(struct buf
*bp
, int);
206 static int softdep_checkread(struct buf
*bp
);
207 static int softdep_checkwrite(struct buf
*bp
);
209 static struct bio_ops softdep_bioops
= {
210 .io_start
= softdep_disk_io_initiation
,
211 .io_complete
= softdep_disk_write_complete
,
212 .io_deallocate
= softdep_deallocate_dependencies
,
213 .io_fsync
= softdep_fsync
,
214 .io_sync
= softdep_process_worklist
,
215 .io_movedeps
= softdep_move_dependencies
,
216 .io_countdeps
= softdep_count_dependencies
,
217 .io_checkread
= softdep_checkread
,
218 .io_checkwrite
= softdep_checkwrite
222 * Locking primitives.
224 static void acquire_lock(struct lock
*);
225 static void free_lock(struct lock
*);
227 static int lock_held(struct lock
*);
230 static struct lock lk
;
232 #define ACQUIRE_LOCK(lkp) acquire_lock(lkp)
233 #define FREE_LOCK(lkp) free_lock(lkp)
236 acquire_lock(struct lock
*lkp
)
238 lockmgr(lkp
, LK_EXCLUSIVE
);
242 free_lock(struct lock
*lkp
)
244 lockmgr(lkp
, LK_RELEASE
);
249 lock_held(struct lock
*lkp
)
251 return lockinuse(lkp
);
256 * Place holder for real semaphores.
263 struct spinlock spin
;
265 static void sema_init(struct sema
*, char *, int);
266 static int sema_get(struct sema
*, struct lock
*);
267 static void sema_release(struct sema
*, struct lock
*);
269 #define NOHOLDER ((struct thread *) -1)
272 sema_init(struct sema
*semap
, char *name
, int timo
)
274 semap
->holder
= NOHOLDER
;
278 spin_init(&semap
->spin
, "ufssema");
282 * Obtain exclusive access, semaphore is protected by the interlock.
283 * If interlock is NULL we must protect the semaphore ourselves.
286 sema_get(struct sema
*semap
, struct lock
*interlock
)
291 if (semap
->value
> 0) {
292 ++semap
->value
; /* serves as wakeup flag */
293 lksleep(semap
, interlock
, 0,
294 semap
->name
, semap
->timo
);
297 semap
->value
= 1; /* serves as owned flag */
298 semap
->holder
= curthread
;
302 spin_lock(&semap
->spin
);
303 if (semap
->value
> 0) {
304 ++semap
->value
; /* serves as wakeup flag */
305 ssleep(semap
, &semap
->spin
, 0,
306 semap
->name
, semap
->timo
);
307 spin_unlock(&semap
->spin
);
310 semap
->value
= 1; /* serves as owned flag */
311 semap
->holder
= curthread
;
312 spin_unlock(&semap
->spin
);
320 sema_release(struct sema
*semap
, struct lock
*lk
)
322 if (semap
->value
<= 0 || semap
->holder
!= curthread
)
323 panic("sema_release: not held");
325 semap
->holder
= NOHOLDER
;
326 if (--semap
->value
> 0) {
331 spin_lock(&semap
->spin
);
332 semap
->holder
= NOHOLDER
;
333 if (--semap
->value
> 0) {
335 spin_unlock(&semap
->spin
);
338 spin_unlock(&semap
->spin
);
344 * Worklist queue management.
345 * These routines require that the lock be held.
347 static void worklist_insert(struct workhead
*, struct worklist
*);
348 static void worklist_remove(struct worklist
*);
349 static void workitem_free(struct worklist
*, int);
351 #define WORKLIST_INSERT_BP(bp, item) do { \
352 (bp)->b_ops = &softdep_bioops; \
353 worklist_insert(&(bp)->b_dep, item); \
356 #define WORKLIST_INSERT(head, item) worklist_insert(head, item)
357 #define WORKLIST_REMOVE(item) worklist_remove(item)
358 #define WORKITEM_FREE(item, type) workitem_free((struct worklist *)item, type)
361 worklist_insert(struct workhead
*head
, struct worklist
*item
)
363 KKASSERT(lock_held(&lk
));
365 if (item
->wk_state
& ONWORKLIST
) {
366 panic("worklist_insert: already on list");
368 item
->wk_state
|= ONWORKLIST
;
369 LIST_INSERT_HEAD(head
, item
, wk_list
);
373 worklist_remove(struct worklist
*item
)
376 KKASSERT(lock_held(&lk
));
377 if ((item
->wk_state
& ONWORKLIST
) == 0)
378 panic("worklist_remove: not on list");
380 item
->wk_state
&= ~ONWORKLIST
;
381 LIST_REMOVE(item
, wk_list
);
385 workitem_free(struct worklist
*item
, int type
)
388 if (item
->wk_state
& ONWORKLIST
)
389 panic("workitem_free: still on list");
390 if (item
->wk_type
!= type
)
391 panic("workitem_free: type mismatch");
393 kfree(item
, DtoM(type
));
397 * Workitem queue management
399 static struct workhead softdep_workitem_pending
;
400 static int num_on_worklist
; /* number of worklist items to be processed */
401 static int softdep_worklist_busy
; /* 1 => trying to do unmount */
402 static int softdep_worklist_req
; /* serialized waiters */
403 static int max_softdeps
; /* maximum number of structs before slowdown */
404 static int tickdelay
= 2; /* number of ticks to pause during slowdown */
405 static int *stat_countp
; /* statistic to count in proc_waiting timeout */
406 static int proc_waiting
; /* tracks whether we have a timeout posted */
407 static struct thread
*filesys_syncer
; /* proc of filesystem syncer process */
408 static int req_clear_inodedeps
; /* syncer process flush some inodedeps */
409 #define FLUSH_INODES 1
410 static int req_clear_remove
; /* syncer process flush some freeblks */
411 #define FLUSH_REMOVE 2
415 static int stat_worklist_push
; /* number of worklist cleanups */
416 static int stat_blk_limit_push
; /* number of times block limit neared */
417 static int stat_ino_limit_push
; /* number of times inode limit neared */
418 static int stat_blk_limit_hit
; /* number of times block slowdown imposed */
419 static int stat_ino_limit_hit
; /* number of times inode slowdown imposed */
420 static int stat_sync_limit_hit
; /* number of synchronous slowdowns imposed */
421 static int stat_indir_blk_ptrs
; /* bufs redirtied as indir ptrs not written */
422 static int stat_inode_bitmap
; /* bufs redirtied as inode bitmap not written */
423 static int stat_direct_blk_ptrs
;/* bufs redirtied as direct ptrs not written */
424 static int stat_dir_entry
; /* bufs redirtied as dir entry cannot write */
427 #include <sys/sysctl.h>
428 SYSCTL_INT(_debug
, OID_AUTO
, max_softdeps
, CTLFLAG_RW
, &max_softdeps
, 0,
429 "Maximum soft dependencies before slowdown occurs");
430 SYSCTL_INT(_debug
, OID_AUTO
, tickdelay
, CTLFLAG_RW
, &tickdelay
, 0,
431 "Ticks to delay before allocating during slowdown");
432 SYSCTL_INT(_debug
, OID_AUTO
, worklist_push
, CTLFLAG_RW
, &stat_worklist_push
, 0,
433 "Number of worklist cleanups");
434 SYSCTL_INT(_debug
, OID_AUTO
, blk_limit_push
, CTLFLAG_RW
, &stat_blk_limit_push
, 0,
435 "Number of times block limit neared");
436 SYSCTL_INT(_debug
, OID_AUTO
, ino_limit_push
, CTLFLAG_RW
, &stat_ino_limit_push
, 0,
437 "Number of times inode limit neared");
438 SYSCTL_INT(_debug
, OID_AUTO
, blk_limit_hit
, CTLFLAG_RW
, &stat_blk_limit_hit
, 0,
439 "Number of times block slowdown imposed");
440 SYSCTL_INT(_debug
, OID_AUTO
, ino_limit_hit
, CTLFLAG_RW
, &stat_ino_limit_hit
, 0,
441 "Number of times inode slowdown imposed ");
442 SYSCTL_INT(_debug
, OID_AUTO
, sync_limit_hit
, CTLFLAG_RW
, &stat_sync_limit_hit
, 0,
443 "Number of synchronous slowdowns imposed");
444 SYSCTL_INT(_debug
, OID_AUTO
, indir_blk_ptrs
, CTLFLAG_RW
, &stat_indir_blk_ptrs
, 0,
445 "Bufs redirtied as indir ptrs not written");
446 SYSCTL_INT(_debug
, OID_AUTO
, inode_bitmap
, CTLFLAG_RW
, &stat_inode_bitmap
, 0,
447 "Bufs redirtied as inode bitmap not written");
448 SYSCTL_INT(_debug
, OID_AUTO
, direct_blk_ptrs
, CTLFLAG_RW
, &stat_direct_blk_ptrs
, 0,
449 "Bufs redirtied as direct ptrs not written");
450 SYSCTL_INT(_debug
, OID_AUTO
, dir_entry
, CTLFLAG_RW
, &stat_dir_entry
, 0,
451 "Bufs redirtied as dir entry cannot write");
455 * Add an item to the end of the work queue.
456 * This routine requires that the lock be held.
457 * This is the only routine that adds items to the list.
458 * The following routine is the only one that removes items
459 * and does so in order from first to last.
462 add_to_worklist(struct worklist
*wk
)
464 static struct worklist
*worklist_tail
;
466 if (wk
->wk_state
& ONWORKLIST
) {
467 panic("add_to_worklist: already on list");
469 wk
->wk_state
|= ONWORKLIST
;
470 if (LIST_FIRST(&softdep_workitem_pending
) == NULL
)
471 LIST_INSERT_HEAD(&softdep_workitem_pending
, wk
, wk_list
);
473 LIST_INSERT_AFTER(worklist_tail
, wk
, wk_list
);
475 num_on_worklist
+= 1;
479 * Process that runs once per second to handle items in the background queue.
481 * Note that we ensure that everything is done in the order in which they
482 * appear in the queue. The code below depends on this property to ensure
483 * that blocks of a file are freed before the inode itself is freed. This
484 * ordering ensures that no new <vfsid, inum, lbn> triples will be generated
485 * until all the old ones have been purged from the dependency lists.
487 * bioops callback - hold io_token
490 softdep_process_worklist(struct mount
*matchmnt
)
492 thread_t td
= curthread
;
493 int matchcnt
, loopcount
;
499 * Record the process identifier of our caller so that we can give
500 * this process preferential treatment in request_cleanup below.
506 * There is no danger of having multiple processes run this
507 * code, but we have to single-thread it when softdep_flushfiles()
508 * is in operation to get an accurate count of the number of items
509 * related to its mount point that are in the list.
511 if (matchmnt
== NULL
) {
512 if (softdep_worklist_busy
< 0) {
516 softdep_worklist_busy
+= 1;
520 * If requested, try removing inode or removal dependencies.
522 if (req_clear_inodedeps
) {
524 req_clear_inodedeps
-= 1;
525 wakeup_one(&proc_waiting
);
527 if (req_clear_remove
) {
529 req_clear_remove
-= 1;
530 wakeup_one(&proc_waiting
);
534 while (num_on_worklist
> 0) {
535 matchcnt
+= process_worklist_item(matchmnt
, 0);
538 * If a umount operation wants to run the worklist
541 if (softdep_worklist_req
&& matchmnt
== NULL
) {
547 * If requested, try removing inode or removal dependencies.
549 if (req_clear_inodedeps
) {
551 req_clear_inodedeps
-= 1;
552 wakeup_one(&proc_waiting
);
554 if (req_clear_remove
) {
556 req_clear_remove
-= 1;
557 wakeup_one(&proc_waiting
);
560 * We do not generally want to stop for buffer space, but if
561 * we are really being a buffer hog, we will stop and wait.
563 if (loopcount
++ % 128 == 0) {
570 * Never allow processing to run for more than one
571 * second. Otherwise the other syncer tasks may get
572 * excessively backlogged.
574 * Use ticks to avoid boundary condition w/time_second or
577 if ((ticks
- starttime
) > hz
&& matchmnt
== NULL
) {
582 if (matchmnt
== NULL
) {
583 --softdep_worklist_busy
;
584 if (softdep_worklist_req
&& softdep_worklist_busy
== 0)
585 wakeup(&softdep_worklist_req
);
593 * Process one item on the worklist.
596 process_worklist_item(struct mount
*matchmnt
, int flags
)
598 struct ufsmount
*ump
;
600 struct dirrem
*dirrem
;
605 KKASSERT(lock_held(&lk
));
608 if (matchmnt
!= NULL
)
609 matchfs
= VFSTOUFS(matchmnt
)->um_fs
;
612 * Normally we just process each item on the worklist in order.
613 * However, if we are in a situation where we cannot lock any
614 * inodes, we have to skip over any dirrem requests whose
615 * vnodes are resident and locked.
617 LIST_FOREACH(wk
, &softdep_workitem_pending
, wk_list
) {
618 if ((flags
& LK_NOWAIT
) == 0 || wk
->wk_type
!= D_DIRREM
)
620 dirrem
= WK_DIRREM(wk
);
621 ump
= VFSTOUFS(dirrem
->dm_mnt
);
622 lwkt_gettoken(&ump
->um_mountp
->mnt_token
);
623 vp
= ufs_ihashlookup(ump
, ump
->um_dev
, dirrem
->dm_oldinum
);
624 lwkt_reltoken(&ump
->um_mountp
->mnt_token
);
625 if (vp
== NULL
|| !vn_islocked(vp
))
632 num_on_worklist
-= 1;
634 switch (wk
->wk_type
) {
636 /* removal of a directory entry */
637 if (WK_DIRREM(wk
)->dm_mnt
== matchmnt
)
639 handle_workitem_remove(WK_DIRREM(wk
));
643 /* releasing blocks and/or fragments from a file */
644 if (WK_FREEBLKS(wk
)->fb_fs
== matchfs
)
646 handle_workitem_freeblocks(WK_FREEBLKS(wk
));
650 /* releasing a fragment when replaced as a file grows */
651 if (WK_FREEFRAG(wk
)->ff_fs
== matchfs
)
653 handle_workitem_freefrag(WK_FREEFRAG(wk
));
657 /* releasing an inode when its link count drops to 0 */
658 if (WK_FREEFILE(wk
)->fx_fs
== matchfs
)
660 handle_workitem_freefile(WK_FREEFILE(wk
));
664 panic("%s_process_worklist: Unknown type %s",
665 "softdep", TYPENAME(wk
->wk_type
));
673 * Move dependencies from one buffer to another.
675 * bioops callback - hold io_token
678 softdep_move_dependencies(struct buf
*oldbp
, struct buf
*newbp
)
680 struct worklist
*wk
, *wktail
;
682 if (LIST_FIRST(&newbp
->b_dep
) != NULL
)
683 panic("softdep_move_dependencies: need merge code");
686 while ((wk
= LIST_FIRST(&oldbp
->b_dep
)) != NULL
) {
687 LIST_REMOVE(wk
, wk_list
);
689 LIST_INSERT_HEAD(&newbp
->b_dep
, wk
, wk_list
);
691 LIST_INSERT_AFTER(wktail
, wk
, wk_list
);
693 newbp
->b_ops
= &softdep_bioops
;
699 * Purge the work list of all items associated with a particular mount point.
702 softdep_flushfiles(struct mount
*oldmnt
, int flags
)
708 * Await our turn to clear out the queue, then serialize access.
711 while (softdep_worklist_busy
!= 0) {
712 softdep_worklist_req
+= 1;
713 lksleep(&softdep_worklist_req
, &lk
, 0, "softflush", 0);
714 softdep_worklist_req
-= 1;
716 softdep_worklist_busy
= -1;
719 if ((error
= ffs_flushfiles(oldmnt
, flags
)) != 0) {
720 softdep_worklist_busy
= 0;
721 if (softdep_worklist_req
)
722 wakeup(&softdep_worklist_req
);
726 * Alternately flush the block device associated with the mount
727 * point and process any dependencies that the flushing
728 * creates. In theory, this loop can happen at most twice,
729 * but we give it a few extra just to be sure.
731 devvp
= VFSTOUFS(oldmnt
)->um_devvp
;
732 for (loopcnt
= 10; loopcnt
> 0; ) {
733 if (softdep_process_worklist(oldmnt
) == 0) {
736 * Do another flush in case any vnodes were brought in
737 * as part of the cleanup operations.
739 if ((error
= ffs_flushfiles(oldmnt
, flags
)) != 0)
742 * If we still found nothing to do, we are really done.
744 if (softdep_process_worklist(oldmnt
) == 0)
747 vn_lock(devvp
, LK_EXCLUSIVE
| LK_RETRY
);
748 error
= VOP_FSYNC(devvp
, MNT_WAIT
, 0);
754 softdep_worklist_busy
= 0;
755 if (softdep_worklist_req
)
756 wakeup(&softdep_worklist_req
);
760 * If we are unmounting then it is an error to fail. If we
761 * are simply trying to downgrade to read-only, then filesystem
762 * activity can keep us busy forever, so we just fail with EBUSY.
765 if (oldmnt
->mnt_kern_flag
& MNTK_UNMOUNT
)
766 panic("softdep_flushfiles: looping");
775 * There are three types of structures that can be looked up:
776 * 1) pagedep structures identified by mount point, inode number,
778 * 2) inodedep structures identified by mount point and inode number.
779 * 3) newblk structures identified by mount point and
780 * physical block number.
782 * The "pagedep" and "inodedep" dependency structures are hashed
783 * separately from the file blocks and inodes to which they correspond.
784 * This separation helps when the in-memory copy of an inode or
785 * file block must be replaced. It also obviates the need to access
786 * an inode or file page when simply updating (or de-allocating)
787 * dependency structures. Lookup of newblk structures is needed to
788 * find newly allocated blocks when trying to associate them with
789 * their allocdirect or allocindir structure.
791 * The lookup routines optionally create and hash a new instance when
792 * an existing entry is not found.
794 #define DEPALLOC 0x0001 /* allocate structure if lookup fails */
795 #define NODELAY 0x0002 /* cannot do background work */
798 * Structures and routines associated with pagedep caching.
800 LIST_HEAD(pagedep_hashhead
, pagedep
) *pagedep_hashtbl
;
801 u_long pagedep_hash
; /* size of hash table - 1 */
802 #define PAGEDEP_HASH(mp, inum, lbn) \
803 (&pagedep_hashtbl[((((register_t)(mp)) >> 13) + (inum) + (lbn)) & \
805 static struct sema pagedep_in_progress
;
808 * Helper routine for pagedep_lookup()
812 pagedep_find(struct pagedep_hashhead
*pagedephd
, ino_t ino
, ufs_lbn_t lbn
,
815 struct pagedep
*pagedep
;
817 LIST_FOREACH(pagedep
, pagedephd
, pd_hash
) {
818 if (ino
== pagedep
->pd_ino
&&
819 lbn
== pagedep
->pd_lbn
&&
820 mp
== pagedep
->pd_mnt
) {
828 * Look up a pagedep. Return 1 if found, 0 if not found.
829 * If not found, allocate if DEPALLOC flag is passed.
830 * Found or allocated entry is returned in pagedeppp.
831 * This routine must be called with splbio interrupts blocked.
834 pagedep_lookup(struct inode
*ip
, ufs_lbn_t lbn
, int flags
,
835 struct pagedep
**pagedeppp
)
837 struct pagedep
*pagedep
;
838 struct pagedep_hashhead
*pagedephd
;
842 KKASSERT(lock_held(&lk
));
844 mp
= ITOV(ip
)->v_mount
;
845 pagedephd
= PAGEDEP_HASH(mp
, ip
->i_number
, lbn
);
847 *pagedeppp
= pagedep_find(pagedephd
, ip
->i_number
, lbn
, mp
);
850 if ((flags
& DEPALLOC
) == 0)
852 if (sema_get(&pagedep_in_progress
, &lk
) == 0)
856 pagedep
= kmalloc(sizeof(struct pagedep
), M_PAGEDEP
,
857 M_SOFTDEP_FLAGS
| M_ZERO
);
859 if (pagedep_find(pagedephd
, ip
->i_number
, lbn
, mp
)) {
860 kprintf("pagedep_lookup: blocking race avoided\n");
861 sema_release(&pagedep_in_progress
, &lk
);
862 kfree(pagedep
, M_PAGEDEP
);
866 pagedep
->pd_list
.wk_type
= D_PAGEDEP
;
867 pagedep
->pd_mnt
= mp
;
868 pagedep
->pd_ino
= ip
->i_number
;
869 pagedep
->pd_lbn
= lbn
;
870 LIST_INIT(&pagedep
->pd_dirremhd
);
871 LIST_INIT(&pagedep
->pd_pendinghd
);
872 for (i
= 0; i
< DAHASHSZ
; i
++)
873 LIST_INIT(&pagedep
->pd_diraddhd
[i
]);
874 LIST_INSERT_HEAD(pagedephd
, pagedep
, pd_hash
);
875 sema_release(&pagedep_in_progress
, &lk
);
876 *pagedeppp
= pagedep
;
881 * Structures and routines associated with inodedep caching.
883 LIST_HEAD(inodedep_hashhead
, inodedep
) *inodedep_hashtbl
;
884 static u_long inodedep_hash
; /* size of hash table - 1 */
885 static long num_inodedep
; /* number of inodedep allocated */
886 #define INODEDEP_HASH(fs, inum) \
887 (&inodedep_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & inodedep_hash])
888 static struct sema inodedep_in_progress
;
891 * Helper routine for inodedep_lookup()
895 inodedep_find(struct inodedep_hashhead
*inodedephd
, struct fs
*fs
, ino_t inum
)
897 struct inodedep
*inodedep
;
899 LIST_FOREACH(inodedep
, inodedephd
, id_hash
) {
900 if (inum
== inodedep
->id_ino
&& fs
== inodedep
->id_fs
)
907 * Look up a inodedep. Return 1 if found, 0 if not found.
908 * If not found, allocate if DEPALLOC flag is passed.
909 * Found or allocated entry is returned in inodedeppp.
910 * This routine must be called with splbio interrupts blocked.
913 inodedep_lookup(struct fs
*fs
, ino_t inum
, int flags
,
914 struct inodedep
**inodedeppp
)
916 struct inodedep
*inodedep
;
917 struct inodedep_hashhead
*inodedephd
;
919 KKASSERT(lock_held(&lk
));
921 inodedephd
= INODEDEP_HASH(fs
, inum
);
923 *inodedeppp
= inodedep_find(inodedephd
, fs
, inum
);
926 if ((flags
& DEPALLOC
) == 0)
930 * If we are over our limit, try to improve the situation.
932 if (num_inodedep
> max_softdeps
/ 2)
933 speedup_syncer(NULL
);
934 if (num_inodedep
> max_softdeps
&&
935 (flags
& NODELAY
) == 0 &&
936 request_cleanup(FLUSH_INODES
)) {
939 if (sema_get(&inodedep_in_progress
, &lk
) == 0)
943 inodedep
= kmalloc(sizeof(struct inodedep
), M_INODEDEP
,
944 M_SOFTDEP_FLAGS
| M_ZERO
);
946 if (inodedep_find(inodedephd
, fs
, inum
)) {
947 kprintf("inodedep_lookup: blocking race avoided\n");
948 sema_release(&inodedep_in_progress
, &lk
);
949 kfree(inodedep
, M_INODEDEP
);
952 inodedep
->id_list
.wk_type
= D_INODEDEP
;
953 inodedep
->id_fs
= fs
;
954 inodedep
->id_ino
= inum
;
955 inodedep
->id_state
= ALLCOMPLETE
;
956 inodedep
->id_nlinkdelta
= 0;
957 inodedep
->id_savedino
= NULL
;
958 inodedep
->id_savedsize
= -1;
959 inodedep
->id_buf
= NULL
;
960 LIST_INIT(&inodedep
->id_pendinghd
);
961 LIST_INIT(&inodedep
->id_inowait
);
962 LIST_INIT(&inodedep
->id_bufwait
);
963 TAILQ_INIT(&inodedep
->id_inoupdt
);
964 TAILQ_INIT(&inodedep
->id_newinoupdt
);
966 LIST_INSERT_HEAD(inodedephd
, inodedep
, id_hash
);
967 sema_release(&inodedep_in_progress
, &lk
);
968 *inodedeppp
= inodedep
;
973 * Structures and routines associated with newblk caching.
975 LIST_HEAD(newblk_hashhead
, newblk
) *newblk_hashtbl
;
976 u_long newblk_hash
; /* size of hash table - 1 */
977 #define NEWBLK_HASH(fs, inum) \
978 (&newblk_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & newblk_hash])
979 static struct sema newblk_in_progress
;
982 * Helper routine for newblk_lookup()
986 newblk_find(struct newblk_hashhead
*newblkhd
, struct fs
*fs
,
987 ufs_daddr_t newblkno
)
989 struct newblk
*newblk
;
991 LIST_FOREACH(newblk
, newblkhd
, nb_hash
) {
992 if (newblkno
== newblk
->nb_newblkno
&& fs
== newblk
->nb_fs
)
999 * Look up a newblk. Return 1 if found, 0 if not found.
1000 * If not found, allocate if DEPALLOC flag is passed.
1001 * Found or allocated entry is returned in newblkpp.
1004 newblk_lookup(struct fs
*fs
, ufs_daddr_t newblkno
, int flags
,
1005 struct newblk
**newblkpp
)
1007 struct newblk
*newblk
;
1008 struct newblk_hashhead
*newblkhd
;
1010 newblkhd
= NEWBLK_HASH(fs
, newblkno
);
1012 *newblkpp
= newblk_find(newblkhd
, fs
, newblkno
);
1015 if ((flags
& DEPALLOC
) == 0)
1017 if (sema_get(&newblk_in_progress
, NULL
) == 0)
1020 newblk
= kmalloc(sizeof(struct newblk
), M_NEWBLK
,
1021 M_SOFTDEP_FLAGS
| M_ZERO
);
1023 if (newblk_find(newblkhd
, fs
, newblkno
)) {
1024 kprintf("newblk_lookup: blocking race avoided\n");
1025 sema_release(&pagedep_in_progress
, NULL
);
1026 kfree(newblk
, M_NEWBLK
);
1029 newblk
->nb_state
= 0;
1031 newblk
->nb_newblkno
= newblkno
;
1032 LIST_INSERT_HEAD(newblkhd
, newblk
, nb_hash
);
1033 sema_release(&newblk_in_progress
, NULL
);
1039 * Executed during filesystem system initialization before
1040 * mounting any filesystems.
1043 softdep_initialize(void)
1045 size_t idsize
= sizeof(struct inodedep
);
1046 int hsize
= vfs_inodehashsize();
1048 LIST_INIT(&mkdirlisthd
);
1049 LIST_INIT(&softdep_workitem_pending
);
1050 max_softdeps
= min(maxvnodes
* 8, M_INODEDEP
->ks_limit
/ (2 * idsize
));
1053 * Cap it at 100,000, having more just gets kinda silly.
1055 max_softdeps
= min(max_softdeps
, 100000);
1057 pagedep_hashtbl
= hashinit(hsize
/ 4, M_PAGEDEP
, &pagedep_hash
);
1058 lockinit(&lk
, "ffs_softdep", 0, LK_CANRECURSE
);
1059 sema_init(&pagedep_in_progress
, "pagedep", 0);
1060 inodedep_hashtbl
= hashinit(hsize
, M_INODEDEP
, &inodedep_hash
);
1061 sema_init(&inodedep_in_progress
, "inodedep", 0);
1062 newblk_hashtbl
= hashinit(64, M_NEWBLK
, &newblk_hash
);
1063 sema_init(&newblk_in_progress
, "newblk", 0);
1064 add_bio_ops(&softdep_bioops
);
1068 * Called at mount time to notify the dependency code that a
1069 * filesystem wishes to use it.
1072 softdep_mount(struct vnode
*devvp
, struct mount
*mp
, struct fs
*fs
)
1074 struct csum cstotal
;
1079 mp
->mnt_flag
&= ~MNT_ASYNC
;
1080 mp
->mnt_flag
|= MNT_SOFTDEP
;
1081 mp
->mnt_bioops
= &softdep_bioops
;
1083 * When doing soft updates, the counters in the
1084 * superblock may have gotten out of sync, so we have
1085 * to scan the cylinder groups and recalculate them.
1087 if (fs
->fs_clean
!= 0)
1089 bzero(&cstotal
, sizeof cstotal
);
1090 for (cyl
= 0; cyl
< fs
->fs_ncg
; cyl
++) {
1091 if ((error
= bread(devvp
, fsbtodoff(fs
, cgtod(fs
, cyl
)),
1092 fs
->fs_cgsize
, &bp
)) != 0) {
1096 cgp
= (struct cg
*)bp
->b_data
;
1097 cstotal
.cs_nffree
+= cgp
->cg_cs
.cs_nffree
;
1098 cstotal
.cs_nbfree
+= cgp
->cg_cs
.cs_nbfree
;
1099 cstotal
.cs_nifree
+= cgp
->cg_cs
.cs_nifree
;
1100 cstotal
.cs_ndir
+= cgp
->cg_cs
.cs_ndir
;
1101 fs
->fs_cs(fs
, cyl
) = cgp
->cg_cs
;
1105 if (bcmp(&cstotal
, &fs
->fs_cstotal
, sizeof cstotal
))
1106 kprintf("ffs_mountfs: superblock updated for soft updates\n");
1108 bcopy(&cstotal
, &fs
->fs_cstotal
, sizeof cstotal
);
1113 * Protecting the freemaps (or bitmaps).
1115 * To eliminate the need to execute fsck before mounting a filesystem
1116 * after a power failure, one must (conservatively) guarantee that the
1117 * on-disk copy of the bitmaps never indicate that a live inode or block is
1118 * free. So, when a block or inode is allocated, the bitmap should be
1119 * updated (on disk) before any new pointers. When a block or inode is
1120 * freed, the bitmap should not be updated until all pointers have been
1121 * reset. The latter dependency is handled by the delayed de-allocation
1122 * approach described below for block and inode de-allocation. The former
1123 * dependency is handled by calling the following procedure when a block or
1124 * inode is allocated. When an inode is allocated an "inodedep" is created
1125 * with its DEPCOMPLETE flag cleared until its bitmap is written to disk.
1126 * Each "inodedep" is also inserted into the hash indexing structure so
1127 * that any additional link additions can be made dependent on the inode
1130 * The ufs filesystem maintains a number of free block counts (e.g., per
1131 * cylinder group, per cylinder and per <cylinder, rotational position> pair)
1132 * in addition to the bitmaps. These counts are used to improve efficiency
1133 * during allocation and therefore must be consistent with the bitmaps.
1134 * There is no convenient way to guarantee post-crash consistency of these
1135 * counts with simple update ordering, for two main reasons: (1) The counts
1136 * and bitmaps for a single cylinder group block are not in the same disk
1137 * sector. If a disk write is interrupted (e.g., by power failure), one may
1138 * be written and the other not. (2) Some of the counts are located in the
1139 * superblock rather than the cylinder group block. So, we focus our soft
1140 * updates implementation on protecting the bitmaps. When mounting a
1141 * filesystem, we recompute the auxiliary counts from the bitmaps.
1145 * Called just after updating the cylinder group block to allocate an inode.
1148 * bp: buffer for cylgroup block with inode map
1149 * ip: inode related to allocation
1150 * newinum: new inode number being allocated
1153 softdep_setup_inomapdep(struct buf
*bp
, struct inode
*ip
, ino_t newinum
)
1155 struct inodedep
*inodedep
;
1156 struct bmsafemap
*bmsafemap
;
1159 * Create a dependency for the newly allocated inode.
1160 * Panic if it already exists as something is seriously wrong.
1161 * Otherwise add it to the dependency list for the buffer holding
1162 * the cylinder group map from which it was allocated.
1165 if ((inodedep_lookup(ip
->i_fs
, newinum
, DEPALLOC
|NODELAY
, &inodedep
))) {
1166 panic("softdep_setup_inomapdep: found inode");
1168 inodedep
->id_buf
= bp
;
1169 inodedep
->id_state
&= ~DEPCOMPLETE
;
1170 bmsafemap
= bmsafemap_lookup(bp
);
1171 LIST_INSERT_HEAD(&bmsafemap
->sm_inodedephd
, inodedep
, id_deps
);
1176 * Called just after updating the cylinder group block to
1177 * allocate block or fragment.
1180 * bp: buffer for cylgroup block with block map
1181 * fs: filesystem doing allocation
1182 * newblkno: number of newly allocated block
1185 softdep_setup_blkmapdep(struct buf
*bp
, struct fs
*fs
,
1186 ufs_daddr_t newblkno
)
1188 struct newblk
*newblk
;
1189 struct bmsafemap
*bmsafemap
;
1192 * Create a dependency for the newly allocated block.
1193 * Add it to the dependency list for the buffer holding
1194 * the cylinder group map from which it was allocated.
1196 if (newblk_lookup(fs
, newblkno
, DEPALLOC
, &newblk
) != 0)
1197 panic("softdep_setup_blkmapdep: found block");
1199 newblk
->nb_bmsafemap
= bmsafemap
= bmsafemap_lookup(bp
);
1200 LIST_INSERT_HEAD(&bmsafemap
->sm_newblkhd
, newblk
, nb_deps
);
1205 * Find the bmsafemap associated with a cylinder group buffer.
1206 * If none exists, create one. The buffer must be locked when
1207 * this routine is called and this routine must be called with
1208 * splbio interrupts blocked.
1210 static struct bmsafemap
*
1211 bmsafemap_lookup(struct buf
*bp
)
1213 struct bmsafemap
*bmsafemap
;
1214 struct worklist
*wk
;
1216 KKASSERT(lock_held(&lk
));
1218 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
1219 if (wk
->wk_type
== D_BMSAFEMAP
)
1220 return (WK_BMSAFEMAP(wk
));
1223 bmsafemap
= kmalloc(sizeof(struct bmsafemap
), M_BMSAFEMAP
,
1225 bmsafemap
->sm_list
.wk_type
= D_BMSAFEMAP
;
1226 bmsafemap
->sm_list
.wk_state
= 0;
1227 bmsafemap
->sm_buf
= bp
;
1228 LIST_INIT(&bmsafemap
->sm_allocdirecthd
);
1229 LIST_INIT(&bmsafemap
->sm_allocindirhd
);
1230 LIST_INIT(&bmsafemap
->sm_inodedephd
);
1231 LIST_INIT(&bmsafemap
->sm_newblkhd
);
1233 WORKLIST_INSERT_BP(bp
, &bmsafemap
->sm_list
);
1238 * Direct block allocation dependencies.
1240 * When a new block is allocated, the corresponding disk locations must be
1241 * initialized (with zeros or new data) before the on-disk inode points to
1242 * them. Also, the freemap from which the block was allocated must be
1243 * updated (on disk) before the inode's pointer. These two dependencies are
1244 * independent of each other and are needed for all file blocks and indirect
1245 * blocks that are pointed to directly by the inode. Just before the
1246 * "in-core" version of the inode is updated with a newly allocated block
1247 * number, a procedure (below) is called to setup allocation dependency
1248 * structures. These structures are removed when the corresponding
1249 * dependencies are satisfied or when the block allocation becomes obsolete
1250 * (i.e., the file is deleted, the block is de-allocated, or the block is a
1251 * fragment that gets upgraded). All of these cases are handled in
1252 * procedures described later.
1254 * When a file extension causes a fragment to be upgraded, either to a larger
1255 * fragment or to a full block, the on-disk location may change (if the
1256 * previous fragment could not simply be extended). In this case, the old
1257 * fragment must be de-allocated, but not until after the inode's pointer has
1258 * been updated. In most cases, this is handled by later procedures, which
1259 * will construct a "freefrag" structure to be added to the workitem queue
1260 * when the inode update is complete (or obsolete). The main exception to
1261 * this is when an allocation occurs while a pending allocation dependency
1262 * (for the same block pointer) remains. This case is handled in the main
1263 * allocation dependency setup procedure by immediately freeing the
1264 * unreferenced fragments.
1267 * ip: inode to which block is being added
1268 * lbn: block pointer within inode
1269 * newblkno: disk block number being added
1270 * oldblkno: previous block number, 0 unless frag
1271 * newsize: size of new block
1272 * oldsize: size of new block
1273 * bp: bp for allocated block
1276 softdep_setup_allocdirect(struct inode
*ip
, ufs_lbn_t lbn
, ufs_daddr_t newblkno
,
1277 ufs_daddr_t oldblkno
, long newsize
, long oldsize
,
1280 struct allocdirect
*adp
, *oldadp
;
1281 struct allocdirectlst
*adphead
;
1282 struct bmsafemap
*bmsafemap
;
1283 struct inodedep
*inodedep
;
1284 struct pagedep
*pagedep
;
1285 struct newblk
*newblk
;
1287 adp
= kmalloc(sizeof(struct allocdirect
), M_ALLOCDIRECT
,
1288 M_SOFTDEP_FLAGS
| M_ZERO
);
1289 adp
->ad_list
.wk_type
= D_ALLOCDIRECT
;
1291 adp
->ad_newblkno
= newblkno
;
1292 adp
->ad_oldblkno
= oldblkno
;
1293 adp
->ad_newsize
= newsize
;
1294 adp
->ad_oldsize
= oldsize
;
1295 adp
->ad_state
= ATTACHED
;
1296 if (newblkno
== oldblkno
)
1297 adp
->ad_freefrag
= NULL
;
1299 adp
->ad_freefrag
= newfreefrag(ip
, oldblkno
, oldsize
);
1301 if (newblk_lookup(ip
->i_fs
, newblkno
, 0, &newblk
) == 0)
1302 panic("softdep_setup_allocdirect: lost block");
1305 inodedep_lookup(ip
->i_fs
, ip
->i_number
, DEPALLOC
| NODELAY
, &inodedep
);
1306 adp
->ad_inodedep
= inodedep
;
1308 if (newblk
->nb_state
== DEPCOMPLETE
) {
1309 adp
->ad_state
|= DEPCOMPLETE
;
1312 bmsafemap
= newblk
->nb_bmsafemap
;
1313 adp
->ad_buf
= bmsafemap
->sm_buf
;
1314 LIST_REMOVE(newblk
, nb_deps
);
1315 LIST_INSERT_HEAD(&bmsafemap
->sm_allocdirecthd
, adp
, ad_deps
);
1317 LIST_REMOVE(newblk
, nb_hash
);
1318 kfree(newblk
, M_NEWBLK
);
1320 WORKLIST_INSERT_BP(bp
, &adp
->ad_list
);
1321 if (lbn
>= UFS_NDADDR
) {
1322 /* allocating an indirect block */
1323 if (oldblkno
!= 0) {
1324 panic("softdep_setup_allocdirect: non-zero indir");
1328 * Allocating a direct block.
1330 * If we are allocating a directory block, then we must
1331 * allocate an associated pagedep to track additions and
1334 if ((ip
->i_mode
& IFMT
) == IFDIR
&&
1335 pagedep_lookup(ip
, lbn
, DEPALLOC
, &pagedep
) == 0) {
1336 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
1340 * The list of allocdirects must be kept in sorted and ascending
1341 * order so that the rollback routines can quickly determine the
1342 * first uncommitted block (the size of the file stored on disk
1343 * ends at the end of the lowest committed fragment, or if there
1344 * are no fragments, at the end of the highest committed block).
1345 * Since files generally grow, the typical case is that the new
1346 * block is to be added at the end of the list. We speed this
1347 * special case by checking against the last allocdirect in the
1348 * list before laboriously traversing the list looking for the
1351 adphead
= &inodedep
->id_newinoupdt
;
1352 oldadp
= TAILQ_LAST(adphead
, allocdirectlst
);
1353 if (oldadp
== NULL
|| oldadp
->ad_lbn
<= lbn
) {
1354 /* insert at end of list */
1355 TAILQ_INSERT_TAIL(adphead
, adp
, ad_next
);
1356 if (oldadp
!= NULL
&& oldadp
->ad_lbn
== lbn
)
1357 allocdirect_merge(adphead
, adp
, oldadp
);
1361 TAILQ_FOREACH(oldadp
, adphead
, ad_next
) {
1362 if (oldadp
->ad_lbn
>= lbn
)
1365 if (oldadp
== NULL
) {
1366 panic("softdep_setup_allocdirect: lost entry");
1368 /* insert in middle of list */
1369 TAILQ_INSERT_BEFORE(oldadp
, adp
, ad_next
);
1370 if (oldadp
->ad_lbn
== lbn
)
1371 allocdirect_merge(adphead
, adp
, oldadp
);
1376 * Replace an old allocdirect dependency with a newer one.
1377 * This routine must be called with splbio interrupts blocked.
1380 * adphead: head of list holding allocdirects
1381 * newadp: allocdirect being added
1382 * oldadp: existing allocdirect being checked
1385 allocdirect_merge(struct allocdirectlst
*adphead
,
1386 struct allocdirect
*newadp
,
1387 struct allocdirect
*oldadp
)
1389 struct freefrag
*freefrag
;
1391 KKASSERT(lock_held(&lk
));
1393 if (newadp
->ad_oldblkno
!= oldadp
->ad_newblkno
||
1394 newadp
->ad_oldsize
!= oldadp
->ad_newsize
||
1395 newadp
->ad_lbn
>= UFS_NDADDR
) {
1396 panic("allocdirect_check: old %d != new %d || lbn %ld >= %d",
1397 newadp
->ad_oldblkno
, oldadp
->ad_newblkno
, newadp
->ad_lbn
,
1400 newadp
->ad_oldblkno
= oldadp
->ad_oldblkno
;
1401 newadp
->ad_oldsize
= oldadp
->ad_oldsize
;
1403 * If the old dependency had a fragment to free or had never
1404 * previously had a block allocated, then the new dependency
1405 * can immediately post its freefrag and adopt the old freefrag.
1406 * This action is done by swapping the freefrag dependencies.
1407 * The new dependency gains the old one's freefrag, and the
1408 * old one gets the new one and then immediately puts it on
1409 * the worklist when it is freed by free_allocdirect. It is
1410 * not possible to do this swap when the old dependency had a
1411 * non-zero size but no previous fragment to free. This condition
1412 * arises when the new block is an extension of the old block.
1413 * Here, the first part of the fragment allocated to the new
1414 * dependency is part of the block currently claimed on disk by
1415 * the old dependency, so cannot legitimately be freed until the
1416 * conditions for the new dependency are fulfilled.
1418 if (oldadp
->ad_freefrag
!= NULL
|| oldadp
->ad_oldblkno
== 0) {
1419 freefrag
= newadp
->ad_freefrag
;
1420 newadp
->ad_freefrag
= oldadp
->ad_freefrag
;
1421 oldadp
->ad_freefrag
= freefrag
;
1423 free_allocdirect(adphead
, oldadp
, 0);
1427 * Allocate a new freefrag structure if needed.
1429 static struct freefrag
*
1430 newfreefrag(struct inode
*ip
, ufs_daddr_t blkno
, long size
)
1432 struct freefrag
*freefrag
;
1438 if (fragnum(fs
, blkno
) + numfrags(fs
, size
) > fs
->fs_frag
)
1439 panic("newfreefrag: frag size");
1440 freefrag
= kmalloc(sizeof(struct freefrag
), M_FREEFRAG
,
1442 freefrag
->ff_list
.wk_type
= D_FREEFRAG
;
1443 freefrag
->ff_state
= ip
->i_uid
& ~ONWORKLIST
; /* XXX - used below */
1444 freefrag
->ff_inum
= ip
->i_number
;
1445 freefrag
->ff_fs
= fs
;
1446 freefrag
->ff_devvp
= ip
->i_devvp
;
1447 freefrag
->ff_blkno
= blkno
;
1448 freefrag
->ff_fragsize
= size
;
1453 * This workitem de-allocates fragments that were replaced during
1454 * file block allocation.
1457 handle_workitem_freefrag(struct freefrag
*freefrag
)
1461 tip
.i_fs
= freefrag
->ff_fs
;
1462 tip
.i_devvp
= freefrag
->ff_devvp
;
1463 tip
.i_dev
= freefrag
->ff_devvp
->v_rdev
;
1464 tip
.i_number
= freefrag
->ff_inum
;
1465 tip
.i_uid
= freefrag
->ff_state
& ~ONWORKLIST
; /* XXX - set above */
1466 ffs_blkfree(&tip
, freefrag
->ff_blkno
, freefrag
->ff_fragsize
);
1467 kfree(freefrag
, M_FREEFRAG
);
1471 * Indirect block allocation dependencies.
1473 * The same dependencies that exist for a direct block also exist when
1474 * a new block is allocated and pointed to by an entry in a block of
1475 * indirect pointers. The undo/redo states described above are also
1476 * used here. Because an indirect block contains many pointers that
1477 * may have dependencies, a second copy of the entire in-memory indirect
1478 * block is kept. The buffer cache copy is always completely up-to-date.
1479 * The second copy, which is used only as a source for disk writes,
1480 * contains only the safe pointers (i.e., those that have no remaining
1481 * update dependencies). The second copy is freed when all pointers
1482 * are safe. The cache is not allowed to replace indirect blocks with
1483 * pending update dependencies. If a buffer containing an indirect
1484 * block with dependencies is written, these routines will mark it
1485 * dirty again. It can only be successfully written once all the
1486 * dependencies are removed. The ffs_fsync routine in conjunction with
1487 * softdep_sync_metadata work together to get all the dependencies
1488 * removed so that a file can be successfully written to disk. Three
1489 * procedures are used when setting up indirect block pointer
1490 * dependencies. The division is necessary because of the organization
1491 * of the "balloc" routine and because of the distinction between file
1492 * pages and file metadata blocks.
1496 * Allocate a new allocindir structure.
1499 * ip: inode for file being extended
1500 * ptrno: offset of pointer in indirect block
1501 * newblkno: disk block number being added
1502 * oldblkno: previous block number, 0 if none
1504 static struct allocindir
*
1505 newallocindir(struct inode
*ip
, int ptrno
, ufs_daddr_t newblkno
,
1506 ufs_daddr_t oldblkno
)
1508 struct allocindir
*aip
;
1510 aip
= kmalloc(sizeof(struct allocindir
), M_ALLOCINDIR
,
1511 M_SOFTDEP_FLAGS
| M_ZERO
);
1512 aip
->ai_list
.wk_type
= D_ALLOCINDIR
;
1513 aip
->ai_state
= ATTACHED
;
1514 aip
->ai_offset
= ptrno
;
1515 aip
->ai_newblkno
= newblkno
;
1516 aip
->ai_oldblkno
= oldblkno
;
1517 aip
->ai_freefrag
= newfreefrag(ip
, oldblkno
, ip
->i_fs
->fs_bsize
);
1522 * Called just before setting an indirect block pointer
1523 * to a newly allocated file page.
1526 * ip: inode for file being extended
1527 * lbn: allocated block number within file
1528 * bp: buffer with indirect blk referencing page
1529 * ptrno: offset of pointer in indirect block
1530 * newblkno: disk block number being added
1531 * oldblkno: previous block number, 0 if none
1532 * nbp: buffer holding allocated page
1535 softdep_setup_allocindir_page(struct inode
*ip
, ufs_lbn_t lbn
,
1536 struct buf
*bp
, int ptrno
,
1537 ufs_daddr_t newblkno
, ufs_daddr_t oldblkno
,
1540 struct allocindir
*aip
;
1541 struct pagedep
*pagedep
;
1543 aip
= newallocindir(ip
, ptrno
, newblkno
, oldblkno
);
1546 * If we are allocating a directory page, then we must
1547 * allocate an associated pagedep to track additions and
1550 if ((ip
->i_mode
& IFMT
) == IFDIR
&&
1551 pagedep_lookup(ip
, lbn
, DEPALLOC
, &pagedep
) == 0)
1552 WORKLIST_INSERT_BP(nbp
, &pagedep
->pd_list
);
1553 WORKLIST_INSERT_BP(nbp
, &aip
->ai_list
);
1555 setup_allocindir_phase2(bp
, ip
, aip
);
1559 * Called just before setting an indirect block pointer to a
1560 * newly allocated indirect block.
1562 * nbp: newly allocated indirect block
1563 * ip: inode for file being extended
1564 * bp: indirect block referencing allocated block
1565 * ptrno: offset of pointer in indirect block
1566 * newblkno: disk block number being added
1569 softdep_setup_allocindir_meta(struct buf
*nbp
, struct inode
*ip
,
1570 struct buf
*bp
, int ptrno
,
1571 ufs_daddr_t newblkno
)
1573 struct allocindir
*aip
;
1575 aip
= newallocindir(ip
, ptrno
, newblkno
, 0);
1577 WORKLIST_INSERT_BP(nbp
, &aip
->ai_list
);
1579 setup_allocindir_phase2(bp
, ip
, aip
);
1583 * Called to finish the allocation of the "aip" allocated
1584 * by one of the two routines above.
1587 * bp: in-memory copy of the indirect block
1588 * ip: inode for file being extended
1589 * aip: allocindir allocated by the above routines
1592 setup_allocindir_phase2(struct buf
*bp
, struct inode
*ip
,
1593 struct allocindir
*aip
)
1595 struct worklist
*wk
;
1596 struct indirdep
*indirdep
, *newindirdep
;
1597 struct bmsafemap
*bmsafemap
;
1598 struct allocindir
*oldaip
;
1599 struct freefrag
*freefrag
;
1600 struct newblk
*newblk
;
1602 if (bp
->b_loffset
>= 0)
1603 panic("setup_allocindir_phase2: not indir blk");
1604 for (indirdep
= NULL
, newindirdep
= NULL
; ; ) {
1606 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
1607 if (wk
->wk_type
!= D_INDIRDEP
)
1609 indirdep
= WK_INDIRDEP(wk
);
1612 if (indirdep
== NULL
&& newindirdep
) {
1613 indirdep
= newindirdep
;
1614 WORKLIST_INSERT_BP(bp
, &indirdep
->ir_list
);
1619 if (newblk_lookup(ip
->i_fs
, aip
->ai_newblkno
, 0,
1621 panic("setup_allocindir: lost block");
1623 if (newblk
->nb_state
== DEPCOMPLETE
) {
1624 aip
->ai_state
|= DEPCOMPLETE
;
1627 bmsafemap
= newblk
->nb_bmsafemap
;
1628 aip
->ai_buf
= bmsafemap
->sm_buf
;
1629 LIST_REMOVE(newblk
, nb_deps
);
1630 LIST_INSERT_HEAD(&bmsafemap
->sm_allocindirhd
,
1633 LIST_REMOVE(newblk
, nb_hash
);
1634 kfree(newblk
, M_NEWBLK
);
1635 aip
->ai_indirdep
= indirdep
;
1637 * Check to see if there is an existing dependency
1638 * for this block. If there is, merge the old
1639 * dependency into the new one.
1641 if (aip
->ai_oldblkno
== 0)
1645 LIST_FOREACH(oldaip
, &indirdep
->ir_deplisthd
, ai_next
)
1646 if (oldaip
->ai_offset
== aip
->ai_offset
)
1648 if (oldaip
!= NULL
) {
1649 if (oldaip
->ai_newblkno
!= aip
->ai_oldblkno
) {
1650 panic("setup_allocindir_phase2: blkno");
1652 aip
->ai_oldblkno
= oldaip
->ai_oldblkno
;
1653 freefrag
= oldaip
->ai_freefrag
;
1654 oldaip
->ai_freefrag
= aip
->ai_freefrag
;
1655 aip
->ai_freefrag
= freefrag
;
1656 free_allocindir(oldaip
, NULL
);
1658 LIST_INSERT_HEAD(&indirdep
->ir_deplisthd
, aip
, ai_next
);
1659 ((ufs_daddr_t
*)indirdep
->ir_savebp
->b_data
)
1660 [aip
->ai_offset
] = aip
->ai_oldblkno
;
1665 * Avoid any possibility of data corruption by
1666 * ensuring that our old version is thrown away.
1668 newindirdep
->ir_savebp
->b_flags
|= B_INVAL
| B_NOCACHE
;
1669 brelse(newindirdep
->ir_savebp
);
1670 WORKITEM_FREE((caddr_t
)newindirdep
, D_INDIRDEP
);
1674 newindirdep
= kmalloc(sizeof(struct indirdep
), M_INDIRDEP
,
1676 newindirdep
->ir_list
.wk_type
= D_INDIRDEP
;
1677 newindirdep
->ir_state
= ATTACHED
;
1678 LIST_INIT(&newindirdep
->ir_deplisthd
);
1679 LIST_INIT(&newindirdep
->ir_donehd
);
1680 if (bp
->b_bio2
.bio_offset
== NOOFFSET
) {
1681 VOP_BMAP(bp
->b_vp
, bp
->b_bio1
.bio_offset
,
1682 &bp
->b_bio2
.bio_offset
, NULL
, NULL
,
1685 KKASSERT(bp
->b_bio2
.bio_offset
!= NOOFFSET
);
1686 newindirdep
->ir_savebp
= getblk(ip
->i_devvp
,
1687 bp
->b_bio2
.bio_offset
,
1688 bp
->b_bcount
, 0, 0);
1689 BUF_KERNPROC(newindirdep
->ir_savebp
);
1690 bcopy(bp
->b_data
, newindirdep
->ir_savebp
->b_data
, bp
->b_bcount
);
1695 * Block de-allocation dependencies.
1697 * When blocks are de-allocated, the on-disk pointers must be nullified before
1698 * the blocks are made available for use by other files. (The true
1699 * requirement is that old pointers must be nullified before new on-disk
1700 * pointers are set. We chose this slightly more stringent requirement to
1701 * reduce complexity.) Our implementation handles this dependency by updating
1702 * the inode (or indirect block) appropriately but delaying the actual block
1703 * de-allocation (i.e., freemap and free space count manipulation) until
1704 * after the updated versions reach stable storage. After the disk is
1705 * updated, the blocks can be safely de-allocated whenever it is convenient.
1706 * This implementation handles only the common case of reducing a file's
1707 * length to zero. Other cases are handled by the conventional synchronous
1710 * The ffs implementation with which we worked double-checks
1711 * the state of the block pointers and file size as it reduces
1712 * a file's length. Some of this code is replicated here in our
1713 * soft updates implementation. The freeblks->fb_chkcnt field is
1714 * used to transfer a part of this information to the procedure
1715 * that eventually de-allocates the blocks.
1717 * This routine should be called from the routine that shortens
1718 * a file's length, before the inode's size or block pointers
1719 * are modified. It will save the block pointer information for
1720 * later release and zero the inode so that the calling routine
1723 struct softdep_setup_freeblocks_info
{
1728 static int softdep_setup_freeblocks_bp(struct buf
*bp
, void *data
);
1732 * ip: The inode whose length is to be reduced
1733 * length: The new length for the file
1736 softdep_setup_freeblocks(struct inode
*ip
, off_t length
)
1738 struct softdep_setup_freeblocks_info info
;
1739 struct freeblks
*freeblks
;
1740 struct inodedep
*inodedep
;
1741 struct allocdirect
*adp
;
1745 int i
, error
, delay
;
1750 panic("softde_setup_freeblocks: non-zero length");
1751 freeblks
= kmalloc(sizeof(struct freeblks
), M_FREEBLKS
,
1752 M_SOFTDEP_FLAGS
| M_ZERO
);
1753 freeblks
->fb_list
.wk_type
= D_FREEBLKS
;
1754 freeblks
->fb_state
= ATTACHED
;
1755 freeblks
->fb_uid
= ip
->i_uid
;
1756 freeblks
->fb_previousinum
= ip
->i_number
;
1757 freeblks
->fb_devvp
= ip
->i_devvp
;
1758 freeblks
->fb_fs
= fs
;
1759 freeblks
->fb_oldsize
= ip
->i_size
;
1760 freeblks
->fb_newsize
= length
;
1761 freeblks
->fb_chkcnt
= ip
->i_blocks
;
1762 for (i
= 0; i
< UFS_NDADDR
; i
++) {
1763 freeblks
->fb_dblks
[i
] = ip
->i_db
[i
];
1766 for (i
= 0; i
< UFS_NIADDR
; i
++) {
1767 freeblks
->fb_iblks
[i
] = ip
->i_ib
[i
];
1773 * Push the zero'ed inode to to its disk buffer so that we are free
1774 * to delete its dependencies below. Once the dependencies are gone
1775 * the buffer can be safely released.
1777 if ((error
= bread(ip
->i_devvp
,
1778 fsbtodoff(fs
, ino_to_fsba(fs
, ip
->i_number
)),
1779 (int)fs
->fs_bsize
, &bp
)) != 0)
1780 softdep_error("softdep_setup_freeblocks", error
);
1781 *((struct ufs1_dinode
*)bp
->b_data
+ ino_to_fsbo(fs
, ip
->i_number
)) =
1784 * Find and eliminate any inode dependencies.
1787 (void) inodedep_lookup(fs
, ip
->i_number
, DEPALLOC
, &inodedep
);
1788 if ((inodedep
->id_state
& IOSTARTED
) != 0) {
1789 panic("softdep_setup_freeblocks: inode busy");
1792 * Add the freeblks structure to the list of operations that
1793 * must await the zero'ed inode being written to disk. If we
1794 * still have a bitmap dependency (delay == 0), then the inode
1795 * has never been written to disk, so we can process the
1796 * freeblks below once we have deleted the dependencies.
1798 delay
= (inodedep
->id_state
& DEPCOMPLETE
);
1800 WORKLIST_INSERT(&inodedep
->id_bufwait
, &freeblks
->fb_list
);
1802 * Because the file length has been truncated to zero, any
1803 * pending block allocation dependency structures associated
1804 * with this inode are obsolete and can simply be de-allocated.
1805 * We must first merge the two dependency lists to get rid of
1806 * any duplicate freefrag structures, then purge the merged list.
1808 merge_inode_lists(inodedep
);
1809 while ((adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
)) != NULL
)
1810 free_allocdirect(&inodedep
->id_inoupdt
, adp
, 1);
1814 * We must wait for any I/O in progress to finish so that
1815 * all potential buffers on the dirty list will be visible.
1816 * Once they are all there, walk the list and get rid of
1821 drain_output(vp
, 1);
1825 lwkt_gettoken(&vp
->v_token
);
1827 count
= RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
1828 softdep_setup_freeblocks_bp
, &info
);
1829 } while (count
!= 0);
1830 lwkt_reltoken(&vp
->v_token
);
1832 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) != 0)
1833 (void)free_inodedep(inodedep
);
1836 freeblks
->fb_state
|= DEPCOMPLETE
;
1838 * If the inode with zeroed block pointers is now on disk
1839 * we can start freeing blocks. Add freeblks to the worklist
1840 * instead of calling handle_workitem_freeblocks directly as
1841 * it is more likely that additional IO is needed to complete
1842 * the request here than in the !delay case.
1844 if ((freeblks
->fb_state
& ALLCOMPLETE
) == ALLCOMPLETE
)
1845 add_to_worklist(&freeblks
->fb_list
);
1850 * If the inode has never been written to disk (delay == 0),
1851 * then we can process the freeblks now that we have deleted
1855 handle_workitem_freeblocks(freeblks
);
1859 softdep_setup_freeblocks_bp(struct buf
*bp
, void *data
)
1861 struct softdep_setup_freeblocks_info
*info
= data
;
1862 struct inodedep
*inodedep
;
1864 if (getdirtybuf(&bp
, MNT_WAIT
) == 0) {
1865 kprintf("softdep_setup_freeblocks_bp(1): caught bp %p going away\n", bp
);
1868 if (bp
->b_vp
!= ITOV(info
->ip
) || (bp
->b_flags
& B_DELWRI
) == 0) {
1869 kprintf("softdep_setup_freeblocks_bp(2): caught bp %p going away\n", bp
);
1873 (void) inodedep_lookup(info
->fs
, info
->ip
->i_number
, 0, &inodedep
);
1874 deallocate_dependencies(bp
, inodedep
);
1875 bp
->b_flags
|= B_INVAL
| B_NOCACHE
;
1883 * Reclaim any dependency structures from a buffer that is about to
1884 * be reallocated to a new vnode. The buffer must be locked, thus,
1885 * no I/O completion operations can occur while we are manipulating
1886 * its associated dependencies. The mutex is held so that other I/O's
1887 * associated with related dependencies do not occur.
1890 deallocate_dependencies(struct buf
*bp
, struct inodedep
*inodedep
)
1892 struct worklist
*wk
;
1893 struct indirdep
*indirdep
;
1894 struct allocindir
*aip
;
1895 struct pagedep
*pagedep
;
1896 struct dirrem
*dirrem
;
1900 while ((wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
1901 switch (wk
->wk_type
) {
1904 indirdep
= WK_INDIRDEP(wk
);
1906 * None of the indirect pointers will ever be visible,
1907 * so they can simply be tossed. GOINGAWAY ensures
1908 * that allocated pointers will be saved in the buffer
1909 * cache until they are freed. Note that they will
1910 * only be able to be found by their physical address
1911 * since the inode mapping the logical address will
1912 * be gone. The save buffer used for the safe copy
1913 * was allocated in setup_allocindir_phase2 using
1914 * the physical address so it could be used for this
1915 * purpose. Hence we swap the safe copy with the real
1916 * copy, allowing the safe copy to be freed and holding
1917 * on to the real copy for later use in indir_trunc.
1919 * NOTE: ir_savebp is relative to the block device
1920 * so b_bio1 contains the device block number.
1922 if (indirdep
->ir_state
& GOINGAWAY
) {
1923 panic("deallocate_dependencies: already gone");
1925 indirdep
->ir_state
|= GOINGAWAY
;
1926 while ((aip
= LIST_FIRST(&indirdep
->ir_deplisthd
)) != NULL
)
1927 free_allocindir(aip
, inodedep
);
1928 if (bp
->b_bio1
.bio_offset
>= 0 ||
1929 bp
->b_bio2
.bio_offset
!= indirdep
->ir_savebp
->b_bio1
.bio_offset
) {
1930 panic("deallocate_dependencies: not indir");
1932 bcopy(bp
->b_data
, indirdep
->ir_savebp
->b_data
,
1934 WORKLIST_REMOVE(wk
);
1935 WORKLIST_INSERT_BP(indirdep
->ir_savebp
, wk
);
1939 pagedep
= WK_PAGEDEP(wk
);
1941 * None of the directory additions will ever be
1942 * visible, so they can simply be tossed.
1944 for (i
= 0; i
< DAHASHSZ
; i
++)
1946 LIST_FIRST(&pagedep
->pd_diraddhd
[i
])))
1948 while ((dap
= LIST_FIRST(&pagedep
->pd_pendinghd
)) != NULL
)
1951 * Copy any directory remove dependencies to the list
1952 * to be processed after the zero'ed inode is written.
1953 * If the inode has already been written, then they
1954 * can be dumped directly onto the work list.
1956 LIST_FOREACH(dirrem
, &pagedep
->pd_dirremhd
, dm_next
) {
1957 LIST_REMOVE(dirrem
, dm_next
);
1958 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
1959 if (inodedep
== NULL
||
1960 (inodedep
->id_state
& ALLCOMPLETE
) ==
1962 add_to_worklist(&dirrem
->dm_list
);
1964 WORKLIST_INSERT(&inodedep
->id_bufwait
,
1967 WORKLIST_REMOVE(&pagedep
->pd_list
);
1968 LIST_REMOVE(pagedep
, pd_hash
);
1969 WORKITEM_FREE(pagedep
, D_PAGEDEP
);
1973 free_allocindir(WK_ALLOCINDIR(wk
), inodedep
);
1978 panic("deallocate_dependencies: Unexpected type %s",
1979 TYPENAME(wk
->wk_type
));
1983 panic("deallocate_dependencies: Unknown type %s",
1984 TYPENAME(wk
->wk_type
));
1991 * Free an allocdirect. Generate a new freefrag work request if appropriate.
1992 * This routine must be called with splbio interrupts blocked.
1995 free_allocdirect(struct allocdirectlst
*adphead
,
1996 struct allocdirect
*adp
, int delay
)
1998 KKASSERT(lock_held(&lk
));
2000 if ((adp
->ad_state
& DEPCOMPLETE
) == 0)
2001 LIST_REMOVE(adp
, ad_deps
);
2002 TAILQ_REMOVE(adphead
, adp
, ad_next
);
2003 if ((adp
->ad_state
& COMPLETE
) == 0)
2004 WORKLIST_REMOVE(&adp
->ad_list
);
2005 if (adp
->ad_freefrag
!= NULL
) {
2007 WORKLIST_INSERT(&adp
->ad_inodedep
->id_bufwait
,
2008 &adp
->ad_freefrag
->ff_list
);
2010 add_to_worklist(&adp
->ad_freefrag
->ff_list
);
2012 WORKITEM_FREE(adp
, D_ALLOCDIRECT
);
2016 * Prepare an inode to be freed. The actual free operation is not
2017 * done until the zero'ed inode has been written to disk.
2020 softdep_freefile(struct vnode
*pvp
, ino_t ino
, int mode
)
2022 struct inode
*ip
= VTOI(pvp
);
2023 struct inodedep
*inodedep
;
2024 struct freefile
*freefile
;
2027 * This sets up the inode de-allocation dependency.
2029 freefile
= kmalloc(sizeof(struct freefile
), M_FREEFILE
,
2031 freefile
->fx_list
.wk_type
= D_FREEFILE
;
2032 freefile
->fx_list
.wk_state
= 0;
2033 freefile
->fx_mode
= mode
;
2034 freefile
->fx_oldinum
= ino
;
2035 freefile
->fx_devvp
= ip
->i_devvp
;
2036 freefile
->fx_fs
= ip
->i_fs
;
2039 * If the inodedep does not exist, then the zero'ed inode has
2040 * been written to disk. If the allocated inode has never been
2041 * written to disk, then the on-disk inode is zero'ed. In either
2042 * case we can free the file immediately.
2045 if (inodedep_lookup(ip
->i_fs
, ino
, 0, &inodedep
) == 0 ||
2046 check_inode_unwritten(inodedep
)) {
2048 handle_workitem_freefile(freefile
);
2051 WORKLIST_INSERT(&inodedep
->id_inowait
, &freefile
->fx_list
);
2056 * Check to see if an inode has never been written to disk. If
2057 * so free the inodedep and return success, otherwise return failure.
2058 * This routine must be called with splbio interrupts blocked.
2060 * If we still have a bitmap dependency, then the inode has never
2061 * been written to disk. Drop the dependency as it is no longer
2062 * necessary since the inode is being deallocated. We set the
2063 * ALLCOMPLETE flags since the bitmap now properly shows that the
2064 * inode is not allocated. Even if the inode is actively being
2065 * written, it has been rolled back to its zero'ed state, so we
2066 * are ensured that a zero inode is what is on the disk. For short
2067 * lived files, this change will usually result in removing all the
2068 * dependencies from the inode so that it can be freed immediately.
2071 check_inode_unwritten(struct inodedep
*inodedep
)
2074 if ((inodedep
->id_state
& DEPCOMPLETE
) != 0 ||
2075 LIST_FIRST(&inodedep
->id_pendinghd
) != NULL
||
2076 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
2077 LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
2078 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
2079 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
||
2080 inodedep
->id_nlinkdelta
!= 0)
2084 * Another process might be in initiate_write_inodeblock
2085 * trying to allocate memory without holding "Softdep Lock".
2087 if ((inodedep
->id_state
& IOSTARTED
) != 0 &&
2088 inodedep
->id_savedino
== NULL
)
2091 inodedep
->id_state
|= ALLCOMPLETE
;
2092 LIST_REMOVE(inodedep
, id_deps
);
2093 inodedep
->id_buf
= NULL
;
2094 if (inodedep
->id_state
& ONWORKLIST
)
2095 WORKLIST_REMOVE(&inodedep
->id_list
);
2096 if (inodedep
->id_savedino
!= NULL
) {
2097 kfree(inodedep
->id_savedino
, M_INODEDEP
);
2098 inodedep
->id_savedino
= NULL
;
2100 if (free_inodedep(inodedep
) == 0) {
2101 panic("check_inode_unwritten: busy inode");
2107 * Try to free an inodedep structure. Return 1 if it could be freed.
2110 free_inodedep(struct inodedep
*inodedep
)
2113 if ((inodedep
->id_state
& ONWORKLIST
) != 0 ||
2114 (inodedep
->id_state
& ALLCOMPLETE
) != ALLCOMPLETE
||
2115 LIST_FIRST(&inodedep
->id_pendinghd
) != NULL
||
2116 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
2117 LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
2118 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
2119 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
||
2120 inodedep
->id_nlinkdelta
!= 0 || inodedep
->id_savedino
!= NULL
)
2122 LIST_REMOVE(inodedep
, id_hash
);
2123 WORKITEM_FREE(inodedep
, D_INODEDEP
);
2129 * This workitem routine performs the block de-allocation.
2130 * The workitem is added to the pending list after the updated
2131 * inode block has been written to disk. As mentioned above,
2132 * checks regarding the number of blocks de-allocated (compared
2133 * to the number of blocks allocated for the file) are also
2134 * performed in this function.
2137 handle_workitem_freeblocks(struct freeblks
*freeblks
)
2142 int i
, level
, bsize
;
2143 long nblocks
, blocksreleased
= 0;
2144 int error
, allerror
= 0;
2145 ufs_lbn_t baselbns
[UFS_NIADDR
], tmpval
;
2147 tip
.i_number
= freeblks
->fb_previousinum
;
2148 tip
.i_devvp
= freeblks
->fb_devvp
;
2149 tip
.i_dev
= freeblks
->fb_devvp
->v_rdev
;
2150 tip
.i_fs
= freeblks
->fb_fs
;
2151 tip
.i_size
= freeblks
->fb_oldsize
;
2152 tip
.i_uid
= freeblks
->fb_uid
;
2153 fs
= freeblks
->fb_fs
;
2155 baselbns
[0] = UFS_NDADDR
;
2156 for (i
= 1; i
< UFS_NIADDR
; i
++) {
2157 tmpval
*= NINDIR(fs
);
2158 baselbns
[i
] = baselbns
[i
- 1] + tmpval
;
2160 nblocks
= btodb(fs
->fs_bsize
);
2163 * Indirect blocks first.
2165 for (level
= (UFS_NIADDR
- 1); level
>= 0; level
--) {
2166 if ((bn
= freeblks
->fb_iblks
[level
]) == 0)
2168 if ((error
= indir_trunc(&tip
, fsbtodoff(fs
, bn
), level
,
2169 baselbns
[level
], &blocksreleased
)) == 0)
2171 ffs_blkfree(&tip
, bn
, fs
->fs_bsize
);
2172 blocksreleased
+= nblocks
;
2175 * All direct blocks or frags.
2177 for (i
= (UFS_NDADDR
- 1); i
>= 0; i
--) {
2178 if ((bn
= freeblks
->fb_dblks
[i
]) == 0)
2180 bsize
= blksize(fs
, &tip
, i
);
2181 ffs_blkfree(&tip
, bn
, bsize
);
2182 blocksreleased
+= btodb(bsize
);
2186 if (freeblks
->fb_chkcnt
!= blocksreleased
)
2187 kprintf("handle_workitem_freeblocks: block count\n");
2189 softdep_error("handle_workitem_freeblks", allerror
);
2190 #endif /* DIAGNOSTIC */
2191 WORKITEM_FREE(freeblks
, D_FREEBLKS
);
2195 * Release blocks associated with the inode ip and stored in the indirect
2196 * block at doffset. If level is greater than SINGLE, the block is an
2197 * indirect block and recursive calls to indirtrunc must be used to
2198 * cleanse other indirect blocks.
2201 indir_trunc(struct inode
*ip
, off_t doffset
, int level
, ufs_lbn_t lbn
,
2208 struct worklist
*wk
;
2209 struct indirdep
*indirdep
;
2210 int i
, lbnadd
, nblocks
;
2211 int error
, allerror
= 0;
2215 for (i
= level
; i
> 0; i
--)
2216 lbnadd
*= NINDIR(fs
);
2218 * Get buffer of block pointers to be freed. This routine is not
2219 * called until the zero'ed inode has been written, so it is safe
2220 * to free blocks as they are encountered. Because the inode has
2221 * been zero'ed, calls to bmap on these blocks will fail. So, we
2222 * have to use the on-disk address and the block device for the
2223 * filesystem to look them up. If the file was deleted before its
2224 * indirect blocks were all written to disk, the routine that set
2225 * us up (deallocate_dependencies) will have arranged to leave
2226 * a complete copy of the indirect block in memory for our use.
2227 * Otherwise we have to read the blocks in from the disk.
2230 if ((bp
= findblk(ip
->i_devvp
, doffset
, FINDBLK_TEST
)) != NULL
&&
2231 (wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
2233 * bp must be ir_savebp, which is held locked for our use.
2235 if (wk
->wk_type
!= D_INDIRDEP
||
2236 (indirdep
= WK_INDIRDEP(wk
))->ir_savebp
!= bp
||
2237 (indirdep
->ir_state
& GOINGAWAY
) == 0) {
2238 panic("indir_trunc: lost indirdep");
2240 WORKLIST_REMOVE(wk
);
2241 WORKITEM_FREE(indirdep
, D_INDIRDEP
);
2242 if (LIST_FIRST(&bp
->b_dep
) != NULL
) {
2243 panic("indir_trunc: dangling dep");
2248 error
= bread(ip
->i_devvp
, doffset
, (int)fs
->fs_bsize
, &bp
);
2253 * Recursively free indirect blocks.
2255 bap
= (ufs_daddr_t
*)bp
->b_data
;
2256 nblocks
= btodb(fs
->fs_bsize
);
2257 for (i
= NINDIR(fs
) - 1; i
>= 0; i
--) {
2258 if ((nb
= bap
[i
]) == 0)
2261 if ((error
= indir_trunc(ip
, fsbtodoff(fs
, nb
),
2262 level
- 1, lbn
+ (i
* lbnadd
), countp
)) != 0)
2265 ffs_blkfree(ip
, nb
, fs
->fs_bsize
);
2268 bp
->b_flags
|= B_INVAL
| B_NOCACHE
;
2274 * Free an allocindir.
2275 * This routine must be called with splbio interrupts blocked.
2278 free_allocindir(struct allocindir
*aip
, struct inodedep
*inodedep
)
2280 struct freefrag
*freefrag
;
2282 KKASSERT(lock_held(&lk
));
2284 if ((aip
->ai_state
& DEPCOMPLETE
) == 0)
2285 LIST_REMOVE(aip
, ai_deps
);
2286 if (aip
->ai_state
& ONWORKLIST
)
2287 WORKLIST_REMOVE(&aip
->ai_list
);
2288 LIST_REMOVE(aip
, ai_next
);
2289 if ((freefrag
= aip
->ai_freefrag
) != NULL
) {
2290 if (inodedep
== NULL
)
2291 add_to_worklist(&freefrag
->ff_list
);
2293 WORKLIST_INSERT(&inodedep
->id_bufwait
,
2294 &freefrag
->ff_list
);
2296 WORKITEM_FREE(aip
, D_ALLOCINDIR
);
2300 * Directory entry addition dependencies.
2302 * When adding a new directory entry, the inode (with its incremented link
2303 * count) must be written to disk before the directory entry's pointer to it.
2304 * Also, if the inode is newly allocated, the corresponding freemap must be
2305 * updated (on disk) before the directory entry's pointer. These requirements
2306 * are met via undo/redo on the directory entry's pointer, which consists
2307 * simply of the inode number.
2309 * As directory entries are added and deleted, the free space within a
2310 * directory block can become fragmented. The ufs filesystem will compact
2311 * a fragmented directory block to make space for a new entry. When this
2312 * occurs, the offsets of previously added entries change. Any "diradd"
2313 * dependency structures corresponding to these entries must be updated with
2318 * This routine is called after the in-memory inode's link
2319 * count has been incremented, but before the directory entry's
2320 * pointer to the inode has been set.
2323 * bp: buffer containing directory block
2324 * dp: inode for directory
2325 * diroffset: offset of new entry in directory
2326 * newinum: inode referenced by new directory entry
2327 * newdirbp: non-NULL => contents of new mkdir
2330 softdep_setup_directory_add(struct buf
*bp
, struct inode
*dp
, off_t diroffset
,
2331 ino_t newinum
, struct buf
*newdirbp
)
2333 int offset
; /* offset of new entry within directory block */
2334 ufs_lbn_t lbn
; /* block in directory containing new entry */
2337 struct pagedep
*pagedep
;
2338 struct inodedep
*inodedep
;
2339 struct mkdir
*mkdir1
, *mkdir2
;
2342 * Whiteouts have no dependencies.
2344 if (newinum
== UFS_WINO
) {
2345 if (newdirbp
!= NULL
)
2351 lbn
= lblkno(fs
, diroffset
);
2352 offset
= blkoff(fs
, diroffset
);
2353 dap
= kmalloc(sizeof(struct diradd
), M_DIRADD
,
2354 M_SOFTDEP_FLAGS
| M_ZERO
);
2355 dap
->da_list
.wk_type
= D_DIRADD
;
2356 dap
->da_offset
= offset
;
2357 dap
->da_newinum
= newinum
;
2358 dap
->da_state
= ATTACHED
;
2359 if (newdirbp
== NULL
) {
2360 dap
->da_state
|= DEPCOMPLETE
;
2363 dap
->da_state
|= MKDIR_BODY
| MKDIR_PARENT
;
2364 mkdir1
= kmalloc(sizeof(struct mkdir
), M_MKDIR
,
2366 mkdir1
->md_list
.wk_type
= D_MKDIR
;
2367 mkdir1
->md_state
= MKDIR_BODY
;
2368 mkdir1
->md_diradd
= dap
;
2369 mkdir2
= kmalloc(sizeof(struct mkdir
), M_MKDIR
,
2371 mkdir2
->md_list
.wk_type
= D_MKDIR
;
2372 mkdir2
->md_state
= MKDIR_PARENT
;
2373 mkdir2
->md_diradd
= dap
;
2375 * Dependency on "." and ".." being written to disk.
2377 mkdir1
->md_buf
= newdirbp
;
2379 LIST_INSERT_HEAD(&mkdirlisthd
, mkdir1
, md_mkdirs
);
2380 WORKLIST_INSERT_BP(newdirbp
, &mkdir1
->md_list
);
2384 * Dependency on link count increase for parent directory
2387 if (inodedep_lookup(dp
->i_fs
, dp
->i_number
, 0, &inodedep
) == 0
2388 || (inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
2389 dap
->da_state
&= ~MKDIR_PARENT
;
2390 WORKITEM_FREE(mkdir2
, D_MKDIR
);
2392 LIST_INSERT_HEAD(&mkdirlisthd
, mkdir2
, md_mkdirs
);
2393 WORKLIST_INSERT(&inodedep
->id_bufwait
,&mkdir2
->md_list
);
2397 * Link into parent directory pagedep to await its being written.
2399 if (pagedep_lookup(dp
, lbn
, DEPALLOC
, &pagedep
) == 0)
2400 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
2401 dap
->da_pagedep
= pagedep
;
2402 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(offset
)], dap
,
2405 * Link into its inodedep. Put it on the id_bufwait list if the inode
2406 * is not yet written. If it is written, do the post-inode write
2407 * processing to put it on the id_pendinghd list.
2409 (void) inodedep_lookup(fs
, newinum
, DEPALLOC
, &inodedep
);
2410 if ((inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
)
2411 diradd_inode_written(dap
, inodedep
);
2413 WORKLIST_INSERT(&inodedep
->id_bufwait
, &dap
->da_list
);
2418 * This procedure is called to change the offset of a directory
2419 * entry when compacting a directory block which must be owned
2420 * exclusively by the caller. Note that the actual entry movement
2421 * must be done in this procedure to ensure that no I/O completions
2422 * occur while the move is in progress.
2425 * dp: inode for directory
2426 * base: address of dp->i_offset
2427 * oldloc: address of old directory location
2428 * newloc: address of new directory location
2429 * entrysize: size of directory entry
2432 softdep_change_directoryentry_offset(struct inode
*dp
, caddr_t base
,
2433 caddr_t oldloc
, caddr_t newloc
,
2436 int offset
, oldoffset
, newoffset
;
2437 struct pagedep
*pagedep
;
2442 lbn
= lblkno(dp
->i_fs
, dp
->i_offset
);
2443 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2444 if (pagedep_lookup(dp
, lbn
, 0, &pagedep
) == 0)
2446 oldoffset
= offset
+ (oldloc
- base
);
2447 newoffset
= offset
+ (newloc
- base
);
2449 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[DIRADDHASH(oldoffset
)], da_pdlist
) {
2450 if (dap
->da_offset
!= oldoffset
)
2452 dap
->da_offset
= newoffset
;
2453 if (DIRADDHASH(newoffset
) == DIRADDHASH(oldoffset
))
2455 LIST_REMOVE(dap
, da_pdlist
);
2456 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(newoffset
)],
2462 LIST_FOREACH(dap
, &pagedep
->pd_pendinghd
, da_pdlist
) {
2463 if (dap
->da_offset
== oldoffset
) {
2464 dap
->da_offset
= newoffset
;
2470 bcopy(oldloc
, newloc
, entrysize
);
2475 * Free a diradd dependency structure. This routine must be called
2476 * with splbio interrupts blocked.
2479 free_diradd(struct diradd
*dap
)
2481 struct dirrem
*dirrem
;
2482 struct pagedep
*pagedep
;
2483 struct inodedep
*inodedep
;
2484 struct mkdir
*mkdir
, *nextmd
;
2486 KKASSERT(lock_held(&lk
));
2488 WORKLIST_REMOVE(&dap
->da_list
);
2489 LIST_REMOVE(dap
, da_pdlist
);
2490 if ((dap
->da_state
& DIRCHG
) == 0) {
2491 pagedep
= dap
->da_pagedep
;
2493 dirrem
= dap
->da_previous
;
2494 pagedep
= dirrem
->dm_pagedep
;
2495 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2496 add_to_worklist(&dirrem
->dm_list
);
2498 if (inodedep_lookup(VFSTOUFS(pagedep
->pd_mnt
)->um_fs
, dap
->da_newinum
,
2500 (void) free_inodedep(inodedep
);
2501 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) != 0) {
2502 for (mkdir
= LIST_FIRST(&mkdirlisthd
); mkdir
; mkdir
= nextmd
) {
2503 nextmd
= LIST_NEXT(mkdir
, md_mkdirs
);
2504 if (mkdir
->md_diradd
!= dap
)
2506 dap
->da_state
&= ~mkdir
->md_state
;
2507 WORKLIST_REMOVE(&mkdir
->md_list
);
2508 LIST_REMOVE(mkdir
, md_mkdirs
);
2509 WORKITEM_FREE(mkdir
, D_MKDIR
);
2511 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) != 0) {
2512 panic("free_diradd: unfound ref");
2515 WORKITEM_FREE(dap
, D_DIRADD
);
2519 * Directory entry removal dependencies.
2521 * When removing a directory entry, the entry's inode pointer must be
2522 * zero'ed on disk before the corresponding inode's link count is decremented
2523 * (possibly freeing the inode for re-use). This dependency is handled by
2524 * updating the directory entry but delaying the inode count reduction until
2525 * after the directory block has been written to disk. After this point, the
2526 * inode count can be decremented whenever it is convenient.
2530 * This routine should be called immediately after removing
2531 * a directory entry. The inode's link count should not be
2532 * decremented by the calling procedure -- the soft updates
2533 * code will do this task when it is safe.
2536 * bp: buffer containing directory block
2537 * dp: inode for the directory being modified
2538 * ip: inode for directory entry being removed
2539 * isrmdir: indicates if doing RMDIR
2542 softdep_setup_remove(struct buf
*bp
, struct inode
*dp
, struct inode
*ip
,
2545 struct dirrem
*dirrem
, *prevdirrem
;
2548 * Allocate a new dirrem if appropriate and ACQUIRE_LOCK.
2550 dirrem
= newdirrem(bp
, dp
, ip
, isrmdir
, &prevdirrem
);
2553 * If the COMPLETE flag is clear, then there were no active
2554 * entries and we want to roll back to a zeroed entry until
2555 * the new inode is committed to disk. If the COMPLETE flag is
2556 * set then we have deleted an entry that never made it to
2557 * disk. If the entry we deleted resulted from a name change,
2558 * then the old name still resides on disk. We cannot delete
2559 * its inode (returned to us in prevdirrem) until the zeroed
2560 * directory entry gets to disk. The new inode has never been
2561 * referenced on the disk, so can be deleted immediately.
2563 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2564 LIST_INSERT_HEAD(&dirrem
->dm_pagedep
->pd_dirremhd
, dirrem
,
2568 if (prevdirrem
!= NULL
)
2569 LIST_INSERT_HEAD(&dirrem
->dm_pagedep
->pd_dirremhd
,
2570 prevdirrem
, dm_next
);
2571 dirrem
->dm_dirinum
= dirrem
->dm_pagedep
->pd_ino
;
2573 handle_workitem_remove(dirrem
);
2578 * Allocate a new dirrem if appropriate and return it along with
2579 * its associated pagedep. Called without a lock, returns with lock.
2581 static long num_dirrem
; /* number of dirrem allocated */
2585 * bp: buffer containing directory block
2586 * dp: inode for the directory being modified
2587 * ip: inode for directory entry being removed
2588 * isrmdir: indicates if doing RMDIR
2589 * prevdirremp: previously referenced inode, if any
2591 static struct dirrem
*
2592 newdirrem(struct buf
*bp
, struct inode
*dp
, struct inode
*ip
,
2593 int isrmdir
, struct dirrem
**prevdirremp
)
2598 struct dirrem
*dirrem
;
2599 struct pagedep
*pagedep
;
2602 * Whiteouts have no deletion dependencies.
2605 panic("newdirrem: whiteout");
2607 * If we are over our limit, try to improve the situation.
2608 * Limiting the number of dirrem structures will also limit
2609 * the number of freefile and freeblks structures.
2611 if (num_dirrem
> max_softdeps
/ 4)
2612 speedup_syncer(NULL
);
2613 if (num_dirrem
> max_softdeps
/ 2) {
2615 request_cleanup(FLUSH_REMOVE
);
2620 dirrem
= kmalloc(sizeof(struct dirrem
), M_DIRREM
,
2621 M_SOFTDEP_FLAGS
| M_ZERO
);
2622 dirrem
->dm_list
.wk_type
= D_DIRREM
;
2623 dirrem
->dm_state
= isrmdir
? RMDIR
: 0;
2624 dirrem
->dm_mnt
= ITOV(ip
)->v_mount
;
2625 dirrem
->dm_oldinum
= ip
->i_number
;
2626 *prevdirremp
= NULL
;
2629 lbn
= lblkno(dp
->i_fs
, dp
->i_offset
);
2630 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2631 if (pagedep_lookup(dp
, lbn
, DEPALLOC
, &pagedep
) == 0)
2632 WORKLIST_INSERT_BP(bp
, &pagedep
->pd_list
);
2633 dirrem
->dm_pagedep
= pagedep
;
2635 * Check for a diradd dependency for the same directory entry.
2636 * If present, then both dependencies become obsolete and can
2637 * be de-allocated. Check for an entry on both the pd_dirraddhd
2638 * list and the pd_pendinghd list.
2641 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[DIRADDHASH(offset
)], da_pdlist
)
2642 if (dap
->da_offset
== offset
)
2646 LIST_FOREACH(dap
, &pagedep
->pd_pendinghd
, da_pdlist
)
2647 if (dap
->da_offset
== offset
)
2653 * Must be ATTACHED at this point.
2655 if ((dap
->da_state
& ATTACHED
) == 0) {
2656 panic("newdirrem: not ATTACHED");
2658 if (dap
->da_newinum
!= ip
->i_number
) {
2659 panic("newdirrem: inum %"PRId64
" should be %"PRId64
,
2660 ip
->i_number
, dap
->da_newinum
);
2663 * If we are deleting a changed name that never made it to disk,
2664 * then return the dirrem describing the previous inode (which
2665 * represents the inode currently referenced from this entry on disk).
2667 if ((dap
->da_state
& DIRCHG
) != 0) {
2668 *prevdirremp
= dap
->da_previous
;
2669 dap
->da_state
&= ~DIRCHG
;
2670 dap
->da_pagedep
= pagedep
;
2673 * We are deleting an entry that never made it to disk.
2674 * Mark it COMPLETE so we can delete its inode immediately.
2676 dirrem
->dm_state
|= COMPLETE
;
2682 * Directory entry change dependencies.
2684 * Changing an existing directory entry requires that an add operation
2685 * be completed first followed by a deletion. The semantics for the addition
2686 * are identical to the description of adding a new entry above except
2687 * that the rollback is to the old inode number rather than zero. Once
2688 * the addition dependency is completed, the removal is done as described
2689 * in the removal routine above.
2693 * This routine should be called immediately after changing
2694 * a directory entry. The inode's link count should not be
2695 * decremented by the calling procedure -- the soft updates
2696 * code will perform this task when it is safe.
2699 * bp: buffer containing directory block
2700 * dp: inode for the directory being modified
2701 * ip: inode for directory entry being removed
2702 * newinum: new inode number for changed entry
2703 * isrmdir: indicates if doing RMDIR
2706 softdep_setup_directory_change(struct buf
*bp
, struct inode
*dp
,
2707 struct inode
*ip
, ino_t newinum
,
2711 struct diradd
*dap
= NULL
;
2712 struct dirrem
*dirrem
, *prevdirrem
;
2713 struct pagedep
*pagedep
;
2714 struct inodedep
*inodedep
;
2716 offset
= blkoff(dp
->i_fs
, dp
->i_offset
);
2719 * Whiteouts do not need diradd dependencies.
2721 if (newinum
!= UFS_WINO
) {
2722 dap
= kmalloc(sizeof(struct diradd
), M_DIRADD
,
2723 M_SOFTDEP_FLAGS
| M_ZERO
);
2724 dap
->da_list
.wk_type
= D_DIRADD
;
2725 dap
->da_state
= DIRCHG
| ATTACHED
| DEPCOMPLETE
;
2726 dap
->da_offset
= offset
;
2727 dap
->da_newinum
= newinum
;
2731 * Allocate a new dirrem and ACQUIRE_LOCK.
2733 dirrem
= newdirrem(bp
, dp
, ip
, isrmdir
, &prevdirrem
);
2734 pagedep
= dirrem
->dm_pagedep
;
2736 * The possible values for isrmdir:
2737 * 0 - non-directory file rename
2738 * 1 - directory rename within same directory
2739 * inum - directory rename to new directory of given inode number
2740 * When renaming to a new directory, we are both deleting and
2741 * creating a new directory entry, so the link count on the new
2742 * directory should not change. Thus we do not need the followup
2743 * dirrem which is usually done in handle_workitem_remove. We set
2744 * the DIRCHG flag to tell handle_workitem_remove to skip the
2748 dirrem
->dm_state
|= DIRCHG
;
2751 * Whiteouts have no additional dependencies,
2752 * so just put the dirrem on the correct list.
2754 if (newinum
== UFS_WINO
) {
2755 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2756 LIST_INSERT_HEAD(&pagedep
->pd_dirremhd
, dirrem
,
2759 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2760 add_to_worklist(&dirrem
->dm_list
);
2767 * If the COMPLETE flag is clear, then there were no active
2768 * entries and we want to roll back to the previous inode until
2769 * the new inode is committed to disk. If the COMPLETE flag is
2770 * set, then we have deleted an entry that never made it to disk.
2771 * If the entry we deleted resulted from a name change, then the old
2772 * inode reference still resides on disk. Any rollback that we do
2773 * needs to be to that old inode (returned to us in prevdirrem). If
2774 * the entry we deleted resulted from a create, then there is
2775 * no entry on the disk, so we want to roll back to zero rather
2776 * than the uncommitted inode. In either of the COMPLETE cases we
2777 * want to immediately free the unwritten and unreferenced inode.
2779 if ((dirrem
->dm_state
& COMPLETE
) == 0) {
2780 dap
->da_previous
= dirrem
;
2782 if (prevdirrem
!= NULL
) {
2783 dap
->da_previous
= prevdirrem
;
2785 dap
->da_state
&= ~DIRCHG
;
2786 dap
->da_pagedep
= pagedep
;
2788 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
2789 add_to_worklist(&dirrem
->dm_list
);
2792 * Link into its inodedep. Put it on the id_bufwait list if the inode
2793 * is not yet written. If it is written, do the post-inode write
2794 * processing to put it on the id_pendinghd list.
2796 if (inodedep_lookup(dp
->i_fs
, newinum
, DEPALLOC
, &inodedep
) == 0 ||
2797 (inodedep
->id_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
2798 dap
->da_state
|= COMPLETE
;
2799 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
2800 WORKLIST_INSERT(&inodedep
->id_pendinghd
, &dap
->da_list
);
2802 LIST_INSERT_HEAD(&pagedep
->pd_diraddhd
[DIRADDHASH(offset
)],
2804 WORKLIST_INSERT(&inodedep
->id_bufwait
, &dap
->da_list
);
2810 * Called whenever the link count on an inode is changed.
2811 * It creates an inode dependency so that the new reference(s)
2812 * to the inode cannot be committed to disk until the updated
2813 * inode has been written.
2816 * ip: the inode with the increased link count
2819 softdep_change_linkcnt(struct inode
*ip
)
2821 struct inodedep
*inodedep
;
2824 (void) inodedep_lookup(ip
->i_fs
, ip
->i_number
, DEPALLOC
, &inodedep
);
2825 if (ip
->i_nlink
< ip
->i_effnlink
) {
2826 panic("softdep_change_linkcnt: bad delta");
2828 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2833 * This workitem decrements the inode's link count.
2834 * If the link count reaches zero, the file is removed.
2837 handle_workitem_remove(struct dirrem
*dirrem
)
2839 struct inodedep
*inodedep
;
2845 error
= VFS_VGET(dirrem
->dm_mnt
, NULL
, dirrem
->dm_oldinum
, &vp
);
2847 softdep_error("handle_workitem_remove: vget", error
);
2852 if ((inodedep_lookup(ip
->i_fs
, dirrem
->dm_oldinum
, 0, &inodedep
)) == 0){
2853 panic("handle_workitem_remove: lost inodedep");
2856 * Normal file deletion.
2858 if ((dirrem
->dm_state
& RMDIR
) == 0) {
2860 ip
->i_flag
|= IN_CHANGE
;
2861 if (ip
->i_nlink
< ip
->i_effnlink
) {
2862 panic("handle_workitem_remove: bad file delta");
2864 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2868 WORKITEM_FREE(dirrem
, D_DIRREM
);
2872 * Directory deletion. Decrement reference count for both the
2873 * just deleted parent directory entry and the reference for ".".
2874 * Next truncate the directory to length zero. When the
2875 * truncation completes, arrange to have the reference count on
2876 * the parent decremented to account for the loss of "..".
2879 ip
->i_flag
|= IN_CHANGE
;
2880 if (ip
->i_nlink
< ip
->i_effnlink
) {
2881 panic("handle_workitem_remove: bad dir delta");
2883 inodedep
->id_nlinkdelta
= ip
->i_nlink
- ip
->i_effnlink
;
2885 if ((error
= ffs_truncate(vp
, (off_t
)0, 0, proc0
.p_ucred
)) != 0)
2886 softdep_error("handle_workitem_remove: truncate", error
);
2888 * Rename a directory to a new parent. Since, we are both deleting
2889 * and creating a new directory entry, the link count on the new
2890 * directory should not change. Thus we skip the followup dirrem.
2892 if (dirrem
->dm_state
& DIRCHG
) {
2895 WORKITEM_FREE(dirrem
, D_DIRREM
);
2899 * If the inodedep does not exist, then the zero'ed inode has
2900 * been written to disk. If the allocated inode has never been
2901 * written to disk, then the on-disk inode is zero'ed. In either
2902 * case we can remove the file immediately.
2905 dirrem
->dm_state
= 0;
2906 oldinum
= dirrem
->dm_oldinum
;
2907 dirrem
->dm_oldinum
= dirrem
->dm_dirinum
;
2908 if (inodedep_lookup(ip
->i_fs
, oldinum
, 0, &inodedep
) == 0 ||
2909 check_inode_unwritten(inodedep
)) {
2912 handle_workitem_remove(dirrem
);
2915 WORKLIST_INSERT(&inodedep
->id_inowait
, &dirrem
->dm_list
);
2917 ip
->i_flag
|= IN_CHANGE
;
2923 * Inode de-allocation dependencies.
2925 * When an inode's link count is reduced to zero, it can be de-allocated. We
2926 * found it convenient to postpone de-allocation until after the inode is
2927 * written to disk with its new link count (zero). At this point, all of the
2928 * on-disk inode's block pointers are nullified and, with careful dependency
2929 * list ordering, all dependencies related to the inode will be satisfied and
2930 * the corresponding dependency structures de-allocated. So, if/when the
2931 * inode is reused, there will be no mixing of old dependencies with new
2932 * ones. This artificial dependency is set up by the block de-allocation
2933 * procedure above (softdep_setup_freeblocks) and completed by the
2934 * following procedure.
2937 handle_workitem_freefile(struct freefile
*freefile
)
2941 struct inodedep
*idp
;
2946 error
= inodedep_lookup(freefile
->fx_fs
, freefile
->fx_oldinum
, 0, &idp
);
2949 panic("handle_workitem_freefile: inodedep survived");
2951 tip
.i_devvp
= freefile
->fx_devvp
;
2952 tip
.i_dev
= freefile
->fx_devvp
->v_rdev
;
2953 tip
.i_fs
= freefile
->fx_fs
;
2955 if ((error
= ffs_freefile(&vp
, freefile
->fx_oldinum
, freefile
->fx_mode
)) != 0)
2956 softdep_error("handle_workitem_freefile", error
);
2957 WORKITEM_FREE(freefile
, D_FREEFILE
);
2961 * Helper function which unlinks marker element from work list and returns
2962 * the next element on the list.
2964 static __inline
struct worklist
*
2965 markernext(struct worklist
*marker
)
2967 struct worklist
*next
;
2969 next
= LIST_NEXT(marker
, wk_list
);
2970 LIST_REMOVE(marker
, wk_list
);
2975 * checkread, checkwrite
2977 * bioops callback - hold io_token
2980 softdep_checkread(struct buf
*bp
)
2982 /* nothing to do, mp lock not needed */
2987 * bioops callback - hold io_token
2990 softdep_checkwrite(struct buf
*bp
)
2992 /* nothing to do, mp lock not needed */
2999 * The dependency structures constructed above are most actively used when file
3000 * system blocks are written to disk. No constraints are placed on when a
3001 * block can be written, but unsatisfied update dependencies are made safe by
3002 * modifying (or replacing) the source memory for the duration of the disk
3003 * write. When the disk write completes, the memory block is again brought
3006 * In-core inode structure reclamation.
3008 * Because there are a finite number of "in-core" inode structures, they are
3009 * reused regularly. By transferring all inode-related dependencies to the
3010 * in-memory inode block and indexing them separately (via "inodedep"s), we
3011 * can allow "in-core" inode structures to be reused at any time and avoid
3012 * any increase in contention.
3014 * Called just before entering the device driver to initiate a new disk I/O.
3015 * The buffer must be locked, thus, no I/O completion operations can occur
3016 * while we are manipulating its associated dependencies.
3018 * bioops callback - hold io_token
3021 * bp: structure describing disk write to occur
3024 softdep_disk_io_initiation(struct buf
*bp
)
3026 struct worklist
*wk
;
3027 struct worklist marker
;
3028 struct indirdep
*indirdep
;
3031 * We only care about write operations. There should never
3032 * be dependencies for reads.
3034 if (bp
->b_cmd
== BUF_CMD_READ
)
3035 panic("softdep_disk_io_initiation: read");
3038 marker
.wk_type
= D_LAST
+ 1; /* Not a normal workitem */
3041 * Do any necessary pre-I/O processing.
3043 for (wk
= LIST_FIRST(&bp
->b_dep
); wk
; wk
= markernext(&marker
)) {
3044 LIST_INSERT_AFTER(wk
, &marker
, wk_list
);
3046 switch (wk
->wk_type
) {
3048 initiate_write_filepage(WK_PAGEDEP(wk
), bp
);
3052 initiate_write_inodeblock(WK_INODEDEP(wk
), bp
);
3056 indirdep
= WK_INDIRDEP(wk
);
3057 if (indirdep
->ir_state
& GOINGAWAY
)
3058 panic("disk_io_initiation: indirdep gone");
3060 * If there are no remaining dependencies, this
3061 * will be writing the real pointers, so the
3062 * dependency can be freed.
3064 if (LIST_FIRST(&indirdep
->ir_deplisthd
) == NULL
) {
3065 indirdep
->ir_savebp
->b_flags
|= B_INVAL
| B_NOCACHE
;
3066 brelse(indirdep
->ir_savebp
);
3067 /* inline expand WORKLIST_REMOVE(wk); */
3068 wk
->wk_state
&= ~ONWORKLIST
;
3069 LIST_REMOVE(wk
, wk_list
);
3070 WORKITEM_FREE(indirdep
, D_INDIRDEP
);
3074 * Replace up-to-date version with safe version.
3076 indirdep
->ir_saveddata
= kmalloc(bp
->b_bcount
,
3080 indirdep
->ir_state
&= ~ATTACHED
;
3081 indirdep
->ir_state
|= UNDONE
;
3082 bcopy(bp
->b_data
, indirdep
->ir_saveddata
, bp
->b_bcount
);
3083 bcopy(indirdep
->ir_savebp
->b_data
, bp
->b_data
,
3095 panic("handle_disk_io_initiation: Unexpected type %s",
3096 TYPENAME(wk
->wk_type
));
3104 * Called from within the procedure above to deal with unsatisfied
3105 * allocation dependencies in a directory. The buffer must be locked,
3106 * thus, no I/O completion operations can occur while we are
3107 * manipulating its associated dependencies.
3110 initiate_write_filepage(struct pagedep
*pagedep
, struct buf
*bp
)
3116 if (pagedep
->pd_state
& IOSTARTED
) {
3118 * This can only happen if there is a driver that does not
3119 * understand chaining. Here biodone will reissue the call
3120 * to strategy for the incomplete buffers.
3122 kprintf("initiate_write_filepage: already started\n");
3125 pagedep
->pd_state
|= IOSTARTED
;
3127 for (i
= 0; i
< DAHASHSZ
; i
++) {
3128 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[i
], da_pdlist
) {
3129 ep
= (struct direct
*)
3130 ((char *)bp
->b_data
+ dap
->da_offset
);
3131 if (ep
->d_ino
!= dap
->da_newinum
) {
3132 panic("%s: dir inum %d != new %"PRId64
,
3133 "initiate_write_filepage",
3134 ep
->d_ino
, dap
->da_newinum
);
3136 if (dap
->da_state
& DIRCHG
)
3137 ep
->d_ino
= dap
->da_previous
->dm_oldinum
;
3140 dap
->da_state
&= ~ATTACHED
;
3141 dap
->da_state
|= UNDONE
;
3148 * Called from within the procedure above to deal with unsatisfied
3149 * allocation dependencies in an inodeblock. The buffer must be
3150 * locked, thus, no I/O completion operations can occur while we
3151 * are manipulating its associated dependencies.
3154 * bp: The inode block
3157 initiate_write_inodeblock(struct inodedep
*inodedep
, struct buf
*bp
)
3159 struct allocdirect
*adp
, *lastadp
;
3160 struct ufs1_dinode
*dp
;
3161 struct ufs1_dinode
*sip
;
3163 ufs_lbn_t prevlbn
= 0;
3166 if (inodedep
->id_state
& IOSTARTED
)
3167 panic("initiate_write_inodeblock: already started");
3168 inodedep
->id_state
|= IOSTARTED
;
3169 fs
= inodedep
->id_fs
;
3170 dp
= (struct ufs1_dinode
*)bp
->b_data
+
3171 ino_to_fsbo(fs
, inodedep
->id_ino
);
3173 * If the bitmap is not yet written, then the allocated
3174 * inode cannot be written to disk.
3176 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
3177 if (inodedep
->id_savedino
!= NULL
)
3178 panic("initiate_write_inodeblock: already doing I/O");
3179 sip
= kmalloc(sizeof(struct ufs1_dinode
), M_INODEDEP
,
3181 inodedep
->id_savedino
= sip
;
3182 *inodedep
->id_savedino
= *dp
;
3183 bzero((caddr_t
)dp
, sizeof(struct ufs1_dinode
));
3184 dp
->di_gen
= inodedep
->id_savedino
->di_gen
;
3188 * If no dependencies, then there is nothing to roll back.
3190 inodedep
->id_savedsize
= dp
->di_size
;
3191 if (TAILQ_FIRST(&inodedep
->id_inoupdt
) == NULL
)
3194 * Set the dependencies to busy.
3197 for (deplist
= 0, adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
;
3198 adp
= TAILQ_NEXT(adp
, ad_next
)) {
3200 if (deplist
!= 0 && prevlbn
>= adp
->ad_lbn
) {
3201 panic("softdep_write_inodeblock: lbn order");
3203 prevlbn
= adp
->ad_lbn
;
3204 if (adp
->ad_lbn
< UFS_NDADDR
&&
3205 dp
->di_db
[adp
->ad_lbn
] != adp
->ad_newblkno
) {
3206 panic("%s: direct pointer #%ld mismatch %d != %d",
3207 "softdep_write_inodeblock", adp
->ad_lbn
,
3208 dp
->di_db
[adp
->ad_lbn
], adp
->ad_newblkno
);
3210 if (adp
->ad_lbn
>= UFS_NDADDR
&&
3211 dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
] != adp
->ad_newblkno
) {
3212 panic("%s: indirect pointer #%ld mismatch %d != %d",
3213 "softdep_write_inodeblock",
3214 adp
->ad_lbn
- UFS_NDADDR
,
3215 dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
],
3218 deplist
|= 1 << adp
->ad_lbn
;
3219 if ((adp
->ad_state
& ATTACHED
) == 0) {
3220 panic("softdep_write_inodeblock: Unknown state 0x%x",
3223 #endif /* DIAGNOSTIC */
3224 adp
->ad_state
&= ~ATTACHED
;
3225 adp
->ad_state
|= UNDONE
;
3228 * The on-disk inode cannot claim to be any larger than the last
3229 * fragment that has been written. Otherwise, the on-disk inode
3230 * might have fragments that were not the last block in the file
3231 * which would corrupt the filesystem.
3233 for (lastadp
= NULL
, adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
;
3234 lastadp
= adp
, adp
= TAILQ_NEXT(adp
, ad_next
)) {
3235 if (adp
->ad_lbn
>= UFS_NDADDR
)
3237 dp
->di_db
[adp
->ad_lbn
] = adp
->ad_oldblkno
;
3238 /* keep going until hitting a rollback to a frag */
3239 if (adp
->ad_oldsize
== 0 || adp
->ad_oldsize
== fs
->fs_bsize
)
3241 dp
->di_size
= fs
->fs_bsize
* adp
->ad_lbn
+ adp
->ad_oldsize
;
3242 for (i
= adp
->ad_lbn
+ 1; i
< UFS_NDADDR
; i
++) {
3244 if (dp
->di_db
[i
] != 0 && (deplist
& (1 << i
)) == 0) {
3245 panic("softdep_write_inodeblock: lost dep1");
3247 #endif /* DIAGNOSTIC */
3250 for (i
= 0; i
< UFS_NIADDR
; i
++) {
3252 if (dp
->di_ib
[i
] != 0 &&
3253 (deplist
& ((1 << UFS_NDADDR
) << i
)) == 0) {
3254 panic("softdep_write_inodeblock: lost dep2");
3256 #endif /* DIAGNOSTIC */
3263 * If we have zero'ed out the last allocated block of the file,
3264 * roll back the size to the last currently allocated block.
3265 * We know that this last allocated block is a full-sized as
3266 * we already checked for fragments in the loop above.
3268 if (lastadp
!= NULL
&&
3269 dp
->di_size
<= (lastadp
->ad_lbn
+ 1) * fs
->fs_bsize
) {
3270 for (i
= lastadp
->ad_lbn
; i
>= 0; i
--)
3271 if (dp
->di_db
[i
] != 0)
3273 dp
->di_size
= (i
+ 1) * fs
->fs_bsize
;
3276 * The only dependencies are for indirect blocks.
3278 * The file size for indirect block additions is not guaranteed.
3279 * Such a guarantee would be non-trivial to achieve. The conventional
3280 * synchronous write implementation also does not make this guarantee.
3281 * Fsck should catch and fix discrepancies. Arguably, the file size
3282 * can be over-estimated without destroying integrity when the file
3283 * moves into the indirect blocks (i.e., is large). If we want to
3284 * postpone fsck, we are stuck with this argument.
3286 for (; adp
; adp
= TAILQ_NEXT(adp
, ad_next
))
3287 dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
] = 0;
3292 * This routine is called during the completion interrupt
3293 * service routine for a disk write (from the procedure called
3294 * by the device driver to inform the filesystem caches of
3295 * a request completion). It should be called early in this
3296 * procedure, before the block is made available to other
3297 * processes or other routines are called.
3299 * bioops callback - hold io_token
3302 * bp: describes the completed disk write
3305 softdep_disk_write_complete(struct buf
*bp
)
3307 struct worklist
*wk
;
3308 struct workhead reattach
;
3309 struct newblk
*newblk
;
3310 struct allocindir
*aip
;
3311 struct allocdirect
*adp
;
3312 struct indirdep
*indirdep
;
3313 struct inodedep
*inodedep
;
3314 struct bmsafemap
*bmsafemap
;
3318 LIST_INIT(&reattach
);
3319 while ((wk
= LIST_FIRST(&bp
->b_dep
)) != NULL
) {
3320 WORKLIST_REMOVE(wk
);
3321 switch (wk
->wk_type
) {
3324 if (handle_written_filepage(WK_PAGEDEP(wk
), bp
))
3325 WORKLIST_INSERT(&reattach
, wk
);
3329 if (handle_written_inodeblock(WK_INODEDEP(wk
), bp
))
3330 WORKLIST_INSERT(&reattach
, wk
);
3334 bmsafemap
= WK_BMSAFEMAP(wk
);
3335 while ((newblk
= LIST_FIRST(&bmsafemap
->sm_newblkhd
))) {
3336 newblk
->nb_state
|= DEPCOMPLETE
;
3337 newblk
->nb_bmsafemap
= NULL
;
3338 LIST_REMOVE(newblk
, nb_deps
);
3341 LIST_FIRST(&bmsafemap
->sm_allocdirecthd
))) {
3342 adp
->ad_state
|= DEPCOMPLETE
;
3344 LIST_REMOVE(adp
, ad_deps
);
3345 handle_allocdirect_partdone(adp
);
3348 LIST_FIRST(&bmsafemap
->sm_allocindirhd
))) {
3349 aip
->ai_state
|= DEPCOMPLETE
;
3351 LIST_REMOVE(aip
, ai_deps
);
3352 handle_allocindir_partdone(aip
);
3355 LIST_FIRST(&bmsafemap
->sm_inodedephd
)) != NULL
) {
3356 inodedep
->id_state
|= DEPCOMPLETE
;
3357 LIST_REMOVE(inodedep
, id_deps
);
3358 inodedep
->id_buf
= NULL
;
3360 WORKITEM_FREE(bmsafemap
, D_BMSAFEMAP
);
3364 handle_written_mkdir(WK_MKDIR(wk
), MKDIR_BODY
);
3368 adp
= WK_ALLOCDIRECT(wk
);
3369 adp
->ad_state
|= COMPLETE
;
3370 handle_allocdirect_partdone(adp
);
3374 aip
= WK_ALLOCINDIR(wk
);
3375 aip
->ai_state
|= COMPLETE
;
3376 handle_allocindir_partdone(aip
);
3380 indirdep
= WK_INDIRDEP(wk
);
3381 if (indirdep
->ir_state
& GOINGAWAY
) {
3382 panic("disk_write_complete: indirdep gone");
3384 bcopy(indirdep
->ir_saveddata
, bp
->b_data
, bp
->b_bcount
);
3385 kfree(indirdep
->ir_saveddata
, M_INDIRDEP
);
3386 indirdep
->ir_saveddata
= NULL
;
3387 indirdep
->ir_state
&= ~UNDONE
;
3388 indirdep
->ir_state
|= ATTACHED
;
3389 while ((aip
= LIST_FIRST(&indirdep
->ir_donehd
)) != NULL
) {
3390 handle_allocindir_partdone(aip
);
3391 if (aip
== LIST_FIRST(&indirdep
->ir_donehd
)) {
3392 panic("disk_write_complete: not gone");
3395 WORKLIST_INSERT(&reattach
, wk
);
3396 if ((bp
->b_flags
& B_DELWRI
) == 0)
3397 stat_indir_blk_ptrs
++;
3402 panic("handle_disk_write_complete: Unknown type %s",
3403 TYPENAME(wk
->wk_type
));
3408 * Reattach any requests that must be redone.
3410 while ((wk
= LIST_FIRST(&reattach
)) != NULL
) {
3411 WORKLIST_REMOVE(wk
);
3412 WORKLIST_INSERT_BP(bp
, wk
);
3419 * Called from within softdep_disk_write_complete above. Note that
3420 * this routine is always called from interrupt level with further
3421 * splbio interrupts blocked.
3424 * adp: the completed allocdirect
3427 handle_allocdirect_partdone(struct allocdirect
*adp
)
3429 struct allocdirect
*listadp
;
3430 struct inodedep
*inodedep
;
3433 if ((adp
->ad_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3435 if (adp
->ad_buf
!= NULL
)
3436 panic("handle_allocdirect_partdone: dangling dep");
3439 * The on-disk inode cannot claim to be any larger than the last
3440 * fragment that has been written. Otherwise, the on-disk inode
3441 * might have fragments that were not the last block in the file
3442 * which would corrupt the filesystem. Thus, we cannot free any
3443 * allocdirects after one whose ad_oldblkno claims a fragment as
3444 * these blocks must be rolled back to zero before writing the inode.
3445 * We check the currently active set of allocdirects in id_inoupdt.
3447 inodedep
= adp
->ad_inodedep
;
3448 bsize
= inodedep
->id_fs
->fs_bsize
;
3449 TAILQ_FOREACH(listadp
, &inodedep
->id_inoupdt
, ad_next
) {
3450 /* found our block */
3453 /* continue if ad_oldlbn is not a fragment */
3454 if (listadp
->ad_oldsize
== 0 ||
3455 listadp
->ad_oldsize
== bsize
)
3457 /* hit a fragment */
3461 * If we have reached the end of the current list without
3462 * finding the just finished dependency, then it must be
3463 * on the future dependency list. Future dependencies cannot
3464 * be freed until they are moved to the current list.
3466 if (listadp
== NULL
) {
3468 TAILQ_FOREACH(listadp
, &inodedep
->id_newinoupdt
, ad_next
)
3469 /* found our block */
3472 if (listadp
== NULL
)
3473 panic("handle_allocdirect_partdone: lost dep");
3478 * If we have found the just finished dependency, then free
3479 * it along with anything that follows it that is complete.
3481 for (; adp
; adp
= listadp
) {
3482 listadp
= TAILQ_NEXT(adp
, ad_next
);
3483 if ((adp
->ad_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3485 free_allocdirect(&inodedep
->id_inoupdt
, adp
, 1);
3490 * Called from within softdep_disk_write_complete above. Note that
3491 * this routine is always called from interrupt level with further
3492 * splbio interrupts blocked.
3495 * aip: the completed allocindir
3498 handle_allocindir_partdone(struct allocindir
*aip
)
3500 struct indirdep
*indirdep
;
3502 if ((aip
->ai_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3504 if (aip
->ai_buf
!= NULL
)
3505 panic("handle_allocindir_partdone: dangling dependency");
3507 indirdep
= aip
->ai_indirdep
;
3508 if (indirdep
->ir_state
& UNDONE
) {
3509 LIST_REMOVE(aip
, ai_next
);
3510 LIST_INSERT_HEAD(&indirdep
->ir_donehd
, aip
, ai_next
);
3513 ((ufs_daddr_t
*)indirdep
->ir_savebp
->b_data
)[aip
->ai_offset
] =
3515 LIST_REMOVE(aip
, ai_next
);
3516 if (aip
->ai_freefrag
!= NULL
)
3517 add_to_worklist(&aip
->ai_freefrag
->ff_list
);
3518 WORKITEM_FREE(aip
, D_ALLOCINDIR
);
3522 * Called from within softdep_disk_write_complete above to restore
3523 * in-memory inode block contents to their most up-to-date state. Note
3524 * that this routine is always called from interrupt level with further
3525 * splbio interrupts blocked.
3528 * bp: buffer containing the inode block
3531 handle_written_inodeblock(struct inodedep
*inodedep
, struct buf
*bp
)
3533 struct worklist
*wk
, *filefree
;
3534 struct allocdirect
*adp
, *nextadp
;
3535 struct ufs1_dinode
*dp
;
3538 if ((inodedep
->id_state
& IOSTARTED
) == 0)
3539 panic("handle_written_inodeblock: not started");
3541 inodedep
->id_state
&= ~IOSTARTED
;
3542 dp
= (struct ufs1_dinode
*)bp
->b_data
+
3543 ino_to_fsbo(inodedep
->id_fs
, inodedep
->id_ino
);
3545 * If we had to rollback the inode allocation because of
3546 * bitmaps being incomplete, then simply restore it.
3547 * Keep the block dirty so that it will not be reclaimed until
3548 * all associated dependencies have been cleared and the
3549 * corresponding updates written to disk.
3551 if (inodedep
->id_savedino
!= NULL
) {
3552 *dp
= *inodedep
->id_savedino
;
3553 kfree(inodedep
->id_savedino
, M_INODEDEP
);
3554 inodedep
->id_savedino
= NULL
;
3555 if ((bp
->b_flags
& B_DELWRI
) == 0)
3556 stat_inode_bitmap
++;
3560 inodedep
->id_state
|= COMPLETE
;
3562 * Roll forward anything that had to be rolled back before
3563 * the inode could be updated.
3566 for (adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); adp
; adp
= nextadp
) {
3567 nextadp
= TAILQ_NEXT(adp
, ad_next
);
3568 if (adp
->ad_state
& ATTACHED
)
3569 panic("handle_written_inodeblock: new entry");
3571 if (adp
->ad_lbn
< UFS_NDADDR
) {
3572 if (dp
->di_db
[adp
->ad_lbn
] != adp
->ad_oldblkno
) {
3573 panic("%s: %s #%ld mismatch %d != %d",
3574 "handle_written_inodeblock",
3575 "direct pointer", adp
->ad_lbn
,
3576 dp
->di_db
[adp
->ad_lbn
], adp
->ad_oldblkno
);
3578 dp
->di_db
[adp
->ad_lbn
] = adp
->ad_newblkno
;
3580 if (dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
] != 0) {
3581 panic("%s: %s #%ld allocated as %d",
3582 "handle_written_inodeblock",
3584 adp
->ad_lbn
- UFS_NDADDR
,
3585 dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
]);
3587 dp
->di_ib
[adp
->ad_lbn
- UFS_NDADDR
] = adp
->ad_newblkno
;
3589 adp
->ad_state
&= ~UNDONE
;
3590 adp
->ad_state
|= ATTACHED
;
3593 if (hadchanges
&& (bp
->b_flags
& B_DELWRI
) == 0)
3594 stat_direct_blk_ptrs
++;
3596 * Reset the file size to its most up-to-date value.
3598 if (inodedep
->id_savedsize
== -1) {
3599 panic("handle_written_inodeblock: bad size");
3601 if (dp
->di_size
!= inodedep
->id_savedsize
) {
3602 dp
->di_size
= inodedep
->id_savedsize
;
3605 inodedep
->id_savedsize
= -1;
3607 * If there were any rollbacks in the inode block, then it must be
3608 * marked dirty so that its will eventually get written back in
3614 * Process any allocdirects that completed during the update.
3616 if ((adp
= TAILQ_FIRST(&inodedep
->id_inoupdt
)) != NULL
)
3617 handle_allocdirect_partdone(adp
);
3619 * Process deallocations that were held pending until the
3620 * inode had been written to disk. Freeing of the inode
3621 * is delayed until after all blocks have been freed to
3622 * avoid creation of new <vfsid, inum, lbn> triples
3623 * before the old ones have been deleted.
3626 while ((wk
= LIST_FIRST(&inodedep
->id_bufwait
)) != NULL
) {
3627 WORKLIST_REMOVE(wk
);
3628 switch (wk
->wk_type
) {
3632 * We defer adding filefree to the worklist until
3633 * all other additions have been made to ensure
3634 * that it will be done after all the old blocks
3637 if (filefree
!= NULL
) {
3638 panic("handle_written_inodeblock: filefree");
3644 handle_written_mkdir(WK_MKDIR(wk
), MKDIR_PARENT
);
3648 diradd_inode_written(WK_DIRADD(wk
), inodedep
);
3652 wk
->wk_state
|= COMPLETE
;
3653 if ((wk
->wk_state
& ALLCOMPLETE
) != ALLCOMPLETE
)
3655 /* -- fall through -- */
3658 add_to_worklist(wk
);
3662 panic("handle_written_inodeblock: Unknown type %s",
3663 TYPENAME(wk
->wk_type
));
3667 if (filefree
!= NULL
) {
3668 if (free_inodedep(inodedep
) == 0) {
3669 panic("handle_written_inodeblock: live inodedep");
3671 add_to_worklist(filefree
);
3676 * If no outstanding dependencies, free it.
3678 if (free_inodedep(inodedep
) || TAILQ_FIRST(&inodedep
->id_inoupdt
) == NULL
)
3680 return (hadchanges
);
3684 * Process a diradd entry after its dependent inode has been written.
3685 * This routine must be called with splbio interrupts blocked.
3688 diradd_inode_written(struct diradd
*dap
, struct inodedep
*inodedep
)
3690 struct pagedep
*pagedep
;
3692 dap
->da_state
|= COMPLETE
;
3693 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3694 if (dap
->da_state
& DIRCHG
)
3695 pagedep
= dap
->da_previous
->dm_pagedep
;
3697 pagedep
= dap
->da_pagedep
;
3698 LIST_REMOVE(dap
, da_pdlist
);
3699 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
3701 WORKLIST_INSERT(&inodedep
->id_pendinghd
, &dap
->da_list
);
3705 * Handle the completion of a mkdir dependency.
3708 handle_written_mkdir(struct mkdir
*mkdir
, int type
)
3711 struct pagedep
*pagedep
;
3713 if (mkdir
->md_state
!= type
) {
3714 panic("handle_written_mkdir: bad type");
3716 dap
= mkdir
->md_diradd
;
3717 dap
->da_state
&= ~type
;
3718 if ((dap
->da_state
& (MKDIR_PARENT
| MKDIR_BODY
)) == 0)
3719 dap
->da_state
|= DEPCOMPLETE
;
3720 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3721 if (dap
->da_state
& DIRCHG
)
3722 pagedep
= dap
->da_previous
->dm_pagedep
;
3724 pagedep
= dap
->da_pagedep
;
3725 LIST_REMOVE(dap
, da_pdlist
);
3726 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
, da_pdlist
);
3728 LIST_REMOVE(mkdir
, md_mkdirs
);
3729 WORKITEM_FREE(mkdir
, D_MKDIR
);
3733 * Called from within softdep_disk_write_complete above.
3734 * A write operation was just completed. Removed inodes can
3735 * now be freed and associated block pointers may be committed.
3736 * Note that this routine is always called from interrupt level
3737 * with further splbio interrupts blocked.
3740 * bp: buffer containing the written page
3743 handle_written_filepage(struct pagedep
*pagedep
, struct buf
*bp
)
3745 struct dirrem
*dirrem
;
3746 struct diradd
*dap
, *nextdap
;
3750 if ((pagedep
->pd_state
& IOSTARTED
) == 0) {
3751 panic("handle_written_filepage: not started");
3753 pagedep
->pd_state
&= ~IOSTARTED
;
3755 * Process any directory removals that have been committed.
3757 while ((dirrem
= LIST_FIRST(&pagedep
->pd_dirremhd
)) != NULL
) {
3758 LIST_REMOVE(dirrem
, dm_next
);
3759 dirrem
->dm_dirinum
= pagedep
->pd_ino
;
3760 add_to_worklist(&dirrem
->dm_list
);
3763 * Free any directory additions that have been committed.
3765 while ((dap
= LIST_FIRST(&pagedep
->pd_pendinghd
)) != NULL
)
3768 * Uncommitted directory entries must be restored.
3770 for (chgs
= 0, i
= 0; i
< DAHASHSZ
; i
++) {
3771 for (dap
= LIST_FIRST(&pagedep
->pd_diraddhd
[i
]); dap
;
3773 nextdap
= LIST_NEXT(dap
, da_pdlist
);
3774 if (dap
->da_state
& ATTACHED
) {
3775 panic("handle_written_filepage: attached");
3777 ep
= (struct direct
*)
3778 ((char *)bp
->b_data
+ dap
->da_offset
);
3779 ep
->d_ino
= dap
->da_newinum
;
3780 dap
->da_state
&= ~UNDONE
;
3781 dap
->da_state
|= ATTACHED
;
3784 * If the inode referenced by the directory has
3785 * been written out, then the dependency can be
3786 * moved to the pending list.
3788 if ((dap
->da_state
& ALLCOMPLETE
) == ALLCOMPLETE
) {
3789 LIST_REMOVE(dap
, da_pdlist
);
3790 LIST_INSERT_HEAD(&pagedep
->pd_pendinghd
, dap
,
3796 * If there were any rollbacks in the directory, then it must be
3797 * marked dirty so that its will eventually get written back in
3801 if ((bp
->b_flags
& B_DELWRI
) == 0)
3806 * If no dependencies remain, the pagedep will be freed.
3807 * Otherwise it will remain to update the page before it
3808 * is written back to disk.
3810 if (LIST_FIRST(&pagedep
->pd_pendinghd
) == NULL
) {
3811 for (i
= 0; i
< DAHASHSZ
; i
++)
3812 if (LIST_FIRST(&pagedep
->pd_diraddhd
[i
]) != NULL
)
3814 if (i
== DAHASHSZ
) {
3815 LIST_REMOVE(pagedep
, pd_hash
);
3816 WORKITEM_FREE(pagedep
, D_PAGEDEP
);
3824 * Writing back in-core inode structures.
3826 * The filesystem only accesses an inode's contents when it occupies an
3827 * "in-core" inode structure. These "in-core" structures are separate from
3828 * the page frames used to cache inode blocks. Only the latter are
3829 * transferred to/from the disk. So, when the updated contents of the
3830 * "in-core" inode structure are copied to the corresponding in-memory inode
3831 * block, the dependencies are also transferred. The following procedure is
3832 * called when copying a dirty "in-core" inode to a cached inode block.
3836 * Called when an inode is loaded from disk. If the effective link count
3837 * differed from the actual link count when it was last flushed, then we
3838 * need to ensure that the correct effective link count is put back.
3841 * ip: the "in_core" copy of the inode
3844 softdep_load_inodeblock(struct inode
*ip
)
3846 struct inodedep
*inodedep
;
3849 * Check for alternate nlink count.
3851 ip
->i_effnlink
= ip
->i_nlink
;
3853 if (inodedep_lookup(ip
->i_fs
, ip
->i_number
, 0, &inodedep
) == 0) {
3857 ip
->i_effnlink
-= inodedep
->id_nlinkdelta
;
3862 * This routine is called just before the "in-core" inode
3863 * information is to be copied to the in-memory inode block.
3864 * Recall that an inode block contains several inodes. If
3865 * the force flag is set, then the dependencies will be
3866 * cleared so that the update can always be made. Note that
3867 * the buffer is locked when this routine is called, so we
3868 * will never be in the middle of writing the inode block
3872 * ip: the "in_core" copy of the inode
3873 * bp: the buffer containing the inode block
3874 * waitfor: nonzero => update must be allowed
3877 softdep_update_inodeblock(struct inode
*ip
, struct buf
*bp
,
3880 struct inodedep
*inodedep
;
3881 struct worklist
*wk
;
3886 * If the effective link count is not equal to the actual link
3887 * count, then we must track the difference in an inodedep while
3888 * the inode is (potentially) tossed out of the cache. Otherwise,
3889 * if there is no existing inodedep, then there are no dependencies
3893 if (inodedep_lookup(ip
->i_fs
, ip
->i_number
, 0, &inodedep
) == 0) {
3895 if (ip
->i_effnlink
!= ip
->i_nlink
)
3896 panic("softdep_update_inodeblock: bad link count");
3899 if (inodedep
->id_nlinkdelta
!= ip
->i_nlink
- ip
->i_effnlink
) {
3900 panic("softdep_update_inodeblock: bad delta");
3903 * Changes have been initiated. Anything depending on these
3904 * changes cannot occur until this inode has been written.
3906 inodedep
->id_state
&= ~COMPLETE
;
3907 if ((inodedep
->id_state
& ONWORKLIST
) == 0)
3908 WORKLIST_INSERT_BP(bp
, &inodedep
->id_list
);
3910 * Any new dependencies associated with the incore inode must
3911 * now be moved to the list associated with the buffer holding
3912 * the in-memory copy of the inode. Once merged process any
3913 * allocdirects that are completed by the merger.
3915 merge_inode_lists(inodedep
);
3916 if (TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
)
3917 handle_allocdirect_partdone(TAILQ_FIRST(&inodedep
->id_inoupdt
));
3919 * Now that the inode has been pushed into the buffer, the
3920 * operations dependent on the inode being written to disk
3921 * can be moved to the id_bufwait so that they will be
3922 * processed when the buffer I/O completes.
3924 while ((wk
= LIST_FIRST(&inodedep
->id_inowait
)) != NULL
) {
3925 WORKLIST_REMOVE(wk
);
3926 WORKLIST_INSERT(&inodedep
->id_bufwait
, wk
);
3929 * Newly allocated inodes cannot be written until the bitmap
3930 * that allocates them have been written (indicated by
3931 * DEPCOMPLETE being set in id_state). If we are doing a
3932 * forced sync (e.g., an fsync on a file), we force the bitmap
3933 * to be written so that the update can be done.
3940 if ((inodedep
->id_state
& DEPCOMPLETE
) != 0) {
3944 gotit
= getdirtybuf(&inodedep
->id_buf
, MNT_WAIT
);
3946 if (inodedep_lookup(ip
->i_fs
, ip
->i_number
, 0, &inodedep
) != 0)
3951 ibp
= inodedep
->id_buf
;
3953 if ((error
= bwrite(ibp
)) != 0)
3954 softdep_error("softdep_update_inodeblock: bwrite", error
);
3958 * Merge the new inode dependency list (id_newinoupdt) into the old
3959 * inode dependency list (id_inoupdt). This routine must be called
3960 * with splbio interrupts blocked.
3963 merge_inode_lists(struct inodedep
*inodedep
)
3965 struct allocdirect
*listadp
, *newadp
;
3967 newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
);
3968 for (listadp
= TAILQ_FIRST(&inodedep
->id_inoupdt
); listadp
&& newadp
;) {
3969 if (listadp
->ad_lbn
< newadp
->ad_lbn
) {
3970 listadp
= TAILQ_NEXT(listadp
, ad_next
);
3973 TAILQ_REMOVE(&inodedep
->id_newinoupdt
, newadp
, ad_next
);
3974 TAILQ_INSERT_BEFORE(listadp
, newadp
, ad_next
);
3975 if (listadp
->ad_lbn
== newadp
->ad_lbn
) {
3976 allocdirect_merge(&inodedep
->id_inoupdt
, newadp
,
3980 newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
);
3982 while ((newadp
= TAILQ_FIRST(&inodedep
->id_newinoupdt
)) != NULL
) {
3983 TAILQ_REMOVE(&inodedep
->id_newinoupdt
, newadp
, ad_next
);
3984 TAILQ_INSERT_TAIL(&inodedep
->id_inoupdt
, newadp
, ad_next
);
3989 * If we are doing an fsync, then we must ensure that any directory
3990 * entries for the inode have been written after the inode gets to disk.
3992 * bioops callback - hold io_token
3995 * vp: the "in_core" copy of the inode
3998 softdep_fsync(struct vnode
*vp
)
4000 struct inodedep
*inodedep
;
4001 struct pagedep
*pagedep
;
4002 struct worklist
*wk
;
4009 int error
, flushparent
;
4014 * Move check from original kernel code, possibly not needed any
4015 * more with the per-mount bioops.
4017 if ((vp
->v_mount
->mnt_flag
& MNT_SOFTDEP
) == 0)
4023 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) == 0) {
4027 if (LIST_FIRST(&inodedep
->id_inowait
) != NULL
||
4028 LIST_FIRST(&inodedep
->id_bufwait
) != NULL
||
4029 TAILQ_FIRST(&inodedep
->id_inoupdt
) != NULL
||
4030 TAILQ_FIRST(&inodedep
->id_newinoupdt
) != NULL
) {
4031 panic("softdep_fsync: pending ops");
4033 for (error
= 0, flushparent
= 0; ; ) {
4034 if ((wk
= LIST_FIRST(&inodedep
->id_pendinghd
)) == NULL
)
4036 if (wk
->wk_type
!= D_DIRADD
) {
4037 panic("softdep_fsync: Unexpected type %s",
4038 TYPENAME(wk
->wk_type
));
4040 dap
= WK_DIRADD(wk
);
4042 * Flush our parent if this directory entry
4043 * has a MKDIR_PARENT dependency.
4045 if (dap
->da_state
& DIRCHG
)
4046 pagedep
= dap
->da_previous
->dm_pagedep
;
4048 pagedep
= dap
->da_pagedep
;
4049 mnt
= pagedep
->pd_mnt
;
4050 parentino
= pagedep
->pd_ino
;
4051 lbn
= pagedep
->pd_lbn
;
4052 if ((dap
->da_state
& (MKDIR_BODY
| COMPLETE
)) != COMPLETE
) {
4053 panic("softdep_fsync: dirty");
4055 flushparent
= dap
->da_state
& MKDIR_PARENT
;
4057 * If we are being fsync'ed as part of vgone'ing this vnode,
4058 * then we will not be able to release and recover the
4059 * vnode below, so we just have to give up on writing its
4060 * directory entry out. It will eventually be written, just
4061 * not now, but then the user was not asking to have it
4062 * written, so we are not breaking any promises.
4064 if (vp
->v_flag
& VRECLAIMED
)
4067 * We prevent deadlock by always fetching inodes from the
4068 * root, moving down the directory tree. Thus, when fetching
4069 * our parent directory, we must unlock ourselves before
4070 * requesting the lock on our parent. See the comment in
4071 * ufs_lookup for details on possible races.
4075 error
= VFS_VGET(mnt
, NULL
, parentino
, &pvp
);
4076 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
4081 if ((error
= ffs_update(pvp
, 1)) != 0) {
4087 * Flush directory page containing the inode's name.
4089 error
= bread(pvp
, lblktodoff(fs
, lbn
), blksize(fs
, VTOI(pvp
), lbn
), &bp
);
4097 if (inodedep_lookup(fs
, ip
->i_number
, 0, &inodedep
) == 0)
4105 * Flush all the dirty bitmaps associated with the block device
4106 * before flushing the rest of the dirty blocks so as to reduce
4107 * the number of dependencies that will have to be rolled back.
4109 static int softdep_fsync_mountdev_bp(struct buf
*bp
, void *data
);
4112 softdep_fsync_mountdev(struct vnode
*vp
)
4114 if (!vn_isdisk(vp
, NULL
))
4115 panic("softdep_fsync_mountdev: vnode not a disk");
4117 lwkt_gettoken(&vp
->v_token
);
4118 RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
4119 softdep_fsync_mountdev_bp
, vp
);
4120 lwkt_reltoken(&vp
->v_token
);
4121 drain_output(vp
, 1);
4126 softdep_fsync_mountdev_bp(struct buf
*bp
, void *data
)
4128 struct worklist
*wk
;
4129 struct vnode
*vp
= data
;
4132 * If it is already scheduled, skip to the next buffer.
4134 if (BUF_LOCK(bp
, LK_EXCLUSIVE
| LK_NOWAIT
))
4136 if (bp
->b_vp
!= vp
|| (bp
->b_flags
& B_DELWRI
) == 0) {
4138 kprintf("softdep_fsync_mountdev_bp: warning, buffer %p ripped out from under vnode %p\n", bp
, vp
);
4142 * We are only interested in bitmaps with outstanding
4145 if ((wk
= LIST_FIRST(&bp
->b_dep
)) == NULL
||
4146 wk
->wk_type
!= D_BMSAFEMAP
) {
4158 * This routine is called when we are trying to synchronously flush a
4159 * file. This routine must eliminate any filesystem metadata dependencies
4160 * so that the syncing routine can succeed by pushing the dirty blocks
4161 * associated with the file. If any I/O errors occur, they are returned.
4163 struct softdep_sync_metadata_info
{
4168 static int softdep_sync_metadata_bp(struct buf
*bp
, void *data
);
4171 softdep_sync_metadata(struct vnode
*vp
, struct thread
*td
)
4173 struct softdep_sync_metadata_info info
;
4177 * Check whether this vnode is involved in a filesystem
4178 * that is doing soft dependency processing.
4180 if (!vn_isdisk(vp
, NULL
)) {
4181 if (!DOINGSOFTDEP(vp
))
4184 if (vp
->v_rdev
->si_mountpoint
== NULL
||
4185 (vp
->v_rdev
->si_mountpoint
->mnt_flag
& MNT_SOFTDEP
) == 0)
4188 * Ensure that any direct block dependencies have been cleared.
4191 if ((error
= flush_inodedep_deps(VTOI(vp
)->i_fs
, VTOI(vp
)->i_number
))) {
4196 * For most files, the only metadata dependencies are the
4197 * cylinder group maps that allocate their inode or blocks.
4198 * The block allocation dependencies can be found by traversing
4199 * the dependency lists for any buffers that remain on their
4200 * dirty buffer list. The inode allocation dependency will
4201 * be resolved when the inode is updated with MNT_WAIT.
4202 * This work is done in two passes. The first pass grabs most
4203 * of the buffers and begins asynchronously writing them. The
4204 * only way to wait for these asynchronous writes is to sleep
4205 * on the filesystem vnode which may stay busy for a long time
4206 * if the filesystem is active. So, instead, we make a second
4207 * pass over the dependencies blocking on each write. In the
4208 * usual case we will be blocking against a write that we
4209 * initiated, so when it is done the dependency will have been
4210 * resolved. Thus the second pass is expected to end quickly.
4212 waitfor
= MNT_NOWAIT
;
4215 * We must wait for any I/O in progress to finish so that
4216 * all potential buffers on the dirty list will be visible.
4218 drain_output(vp
, 1);
4221 info
.waitfor
= waitfor
;
4222 lwkt_gettoken(&vp
->v_token
);
4223 error
= RB_SCAN(buf_rb_tree
, &vp
->v_rbdirty_tree
, NULL
,
4224 softdep_sync_metadata_bp
, &info
);
4225 lwkt_reltoken(&vp
->v_token
);
4228 return(-error
); /* error code */
4232 * The brief unlock is to allow any pent up dependency
4233 * processing to be done. Then proceed with the second pass.
4235 if (waitfor
& MNT_NOWAIT
) {
4243 * If we have managed to get rid of all the dirty buffers,
4244 * then we are done. For certain directories and block
4245 * devices, we may need to do further work.
4247 * We must wait for any I/O in progress to finish so that
4248 * all potential buffers on the dirty list will be visible.
4250 drain_output(vp
, 1);
4251 if (RB_EMPTY(&vp
->v_rbdirty_tree
)) {
4258 * If we are trying to sync a block device, some of its buffers may
4259 * contain metadata that cannot be written until the contents of some
4260 * partially written files have been written to disk. The only easy
4261 * way to accomplish this is to sync the entire filesystem (luckily
4262 * this happens rarely).
4264 if (vn_isdisk(vp
, NULL
) &&
4266 vp
->v_rdev
->si_mountpoint
&& !vn_islocked(vp
) &&
4267 (error
= VFS_SYNC(vp
->v_rdev
->si_mountpoint
, MNT_WAIT
)) != 0)
4273 softdep_sync_metadata_bp(struct buf
*bp
, void *data
)
4275 struct softdep_sync_metadata_info
*info
= data
;
4276 struct pagedep
*pagedep
;
4277 struct allocdirect
*adp
;
4278 struct allocindir
*aip
;
4279 struct worklist
*wk
;
4284 if (getdirtybuf(&bp
, MNT_WAIT
) == 0) {
4285 kprintf("softdep_sync_metadata_bp(1): caught buf %p going away\n", bp
);
4288 if (bp
->b_vp
!= info
->vp
|| (bp
->b_flags
& B_DELWRI
) == 0) {
4289 kprintf("softdep_sync_metadata_bp(2): caught buf %p going away vp %p\n", bp
, info
->vp
);
4295 * As we hold the buffer locked, none of its dependencies
4298 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
4299 switch (wk
->wk_type
) {
4302 adp
= WK_ALLOCDIRECT(wk
);
4303 if (adp
->ad_state
& DEPCOMPLETE
)
4306 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4309 if (info
->waitfor
& MNT_NOWAIT
) {
4311 } else if ((error
= bwrite(nbp
)) != 0) {
4320 aip
= WK_ALLOCINDIR(wk
);
4321 if (aip
->ai_state
& DEPCOMPLETE
)
4324 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4327 if (info
->waitfor
& MNT_NOWAIT
) {
4329 } else if ((error
= bwrite(nbp
)) != 0) {
4340 LIST_FOREACH(aip
, &WK_INDIRDEP(wk
)->ir_deplisthd
, ai_next
) {
4341 if (aip
->ai_state
& DEPCOMPLETE
)
4344 if (getdirtybuf(&nbp
, MNT_WAIT
) == 0)
4347 if ((error
= bwrite(nbp
)) != 0) {
4358 if ((error
= flush_inodedep_deps(WK_INODEDEP(wk
)->id_fs
,
4359 WK_INODEDEP(wk
)->id_ino
)) != 0) {
4369 * We are trying to sync a directory that may
4370 * have dependencies on both its own metadata
4371 * and/or dependencies on the inodes of any
4372 * recently allocated files. We walk its diradd
4373 * lists pushing out the associated inode.
4375 pagedep
= WK_PAGEDEP(wk
);
4376 for (i
= 0; i
< DAHASHSZ
; i
++) {
4377 if (LIST_FIRST(&pagedep
->pd_diraddhd
[i
]) == NULL
)
4380 flush_pagedep_deps(info
->vp
,
4382 &pagedep
->pd_diraddhd
[i
]))) {
4393 * This case should never happen if the vnode has
4394 * been properly sync'ed. However, if this function
4395 * is used at a place where the vnode has not yet
4396 * been sync'ed, this dependency can show up. So,
4397 * rather than panic, just flush it.
4399 nbp
= WK_MKDIR(wk
)->md_buf
;
4400 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4403 if (info
->waitfor
& MNT_NOWAIT
) {
4405 } else if ((error
= bwrite(nbp
)) != 0) {
4415 * This case should never happen if the vnode has
4416 * been properly sync'ed. However, if this function
4417 * is used at a place where the vnode has not yet
4418 * been sync'ed, this dependency can show up. So,
4419 * rather than panic, just flush it.
4421 * nbp can wind up == bp if a device node for the
4422 * same filesystem is being fsynced at the same time,
4423 * leading to a panic if we don't catch the case.
4425 nbp
= WK_BMSAFEMAP(wk
)->sm_buf
;
4428 if (getdirtybuf(&nbp
, info
->waitfor
) == 0)
4431 if (info
->waitfor
& MNT_NOWAIT
) {
4433 } else if ((error
= bwrite(nbp
)) != 0) {
4442 panic("softdep_sync_metadata: Unknown type %s",
4443 TYPENAME(wk
->wk_type
));
4454 * Flush the dependencies associated with an inodedep.
4455 * Called with splbio blocked.
4458 flush_inodedep_deps(struct fs
*fs
, ino_t ino
)
4460 struct inodedep
*inodedep
;
4461 struct allocdirect
*adp
;
4466 * This work is done in two passes. The first pass grabs most
4467 * of the buffers and begins asynchronously writing them. The
4468 * only way to wait for these asynchronous writes is to sleep
4469 * on the filesystem vnode which may stay busy for a long time
4470 * if the filesystem is active. So, instead, we make a second
4471 * pass over the dependencies blocking on each write. In the
4472 * usual case we will be blocking against a write that we
4473 * initiated, so when it is done the dependency will have been
4474 * resolved. Thus the second pass is expected to end quickly.
4475 * We give a brief window at the top of the loop to allow
4476 * any pending I/O to complete.
4478 for (waitfor
= MNT_NOWAIT
; ; ) {
4481 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) == 0)
4483 TAILQ_FOREACH(adp
, &inodedep
->id_inoupdt
, ad_next
) {
4484 if (adp
->ad_state
& DEPCOMPLETE
)
4487 if (getdirtybuf(&bp
, waitfor
) == 0) {
4488 if (waitfor
& MNT_NOWAIT
)
4493 if (waitfor
& MNT_NOWAIT
) {
4495 } else if ((error
= bwrite(bp
)) != 0) {
4504 TAILQ_FOREACH(adp
, &inodedep
->id_newinoupdt
, ad_next
) {
4505 if (adp
->ad_state
& DEPCOMPLETE
)
4508 if (getdirtybuf(&bp
, waitfor
) == 0) {
4509 if (waitfor
& MNT_NOWAIT
)
4514 if (waitfor
& MNT_NOWAIT
) {
4516 } else if ((error
= bwrite(bp
)) != 0) {
4526 * If pass2, we are done, otherwise do pass 2.
4528 if (waitfor
== MNT_WAIT
)
4533 * Try freeing inodedep in case all dependencies have been removed.
4535 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) != 0)
4536 (void) free_inodedep(inodedep
);
4541 * Eliminate a pagedep dependency by flushing out all its diradd dependencies.
4542 * Called with splbio blocked.
4545 flush_pagedep_deps(struct vnode
*pvp
, struct mount
*mp
,
4546 struct diraddhd
*diraddhdp
)
4548 struct inodedep
*inodedep
;
4549 struct ufsmount
*ump
;
4551 struct worklist
*wk
;
4553 int gotit
, error
= 0;
4558 while ((dap
= LIST_FIRST(diraddhdp
)) != NULL
) {
4560 * Flush ourselves if this directory entry
4561 * has a MKDIR_PARENT dependency.
4563 if (dap
->da_state
& MKDIR_PARENT
) {
4565 if ((error
= ffs_update(pvp
, 1)) != 0)
4569 * If that cleared dependencies, go on to next.
4571 if (dap
!= LIST_FIRST(diraddhdp
))
4573 if (dap
->da_state
& MKDIR_PARENT
) {
4574 panic("flush_pagedep_deps: MKDIR_PARENT");
4578 * A newly allocated directory must have its "." and
4579 * ".." entries written out before its name can be
4580 * committed in its parent. We do not want or need
4581 * the full semantics of a synchronous VOP_FSYNC as
4582 * that may end up here again, once for each directory
4583 * level in the filesystem. Instead, we push the blocks
4584 * and wait for them to clear. We have to fsync twice
4585 * because the first call may choose to defer blocks
4586 * that still have dependencies, but deferral will
4587 * happen at most once.
4589 inum
= dap
->da_newinum
;
4590 if (dap
->da_state
& MKDIR_BODY
) {
4592 if ((error
= VFS_VGET(mp
, NULL
, inum
, &vp
)) != 0)
4594 if ((error
=VOP_FSYNC(vp
, MNT_NOWAIT
, 0)) ||
4595 (error
=VOP_FSYNC(vp
, MNT_NOWAIT
, 0))) {
4599 drain_output(vp
, 0);
4601 * If first block is still dirty with a D_MKDIR
4602 * dependency then it needs to be written now.
4606 bp
= findblk(vp
, 0, FINDBLK_TEST
);
4609 goto mkdir_body_continue
;
4611 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
)
4612 if (wk
->wk_type
== D_MKDIR
) {
4613 gotit
= getdirtybuf(&bp
, MNT_WAIT
);
4615 if (gotit
&& (error
= bwrite(bp
)) != 0)
4616 goto mkdir_body_continue
;
4621 mkdir_body_continue
:
4623 /* Flushing of first block failed. */
4628 * If that cleared dependencies, go on to next.
4630 if (dap
!= LIST_FIRST(diraddhdp
))
4632 if (dap
->da_state
& MKDIR_BODY
) {
4633 panic("flush_pagedep_deps: %p MKDIR_BODY", dap
);
4637 * Flush the inode on which the directory entry depends.
4638 * Having accounted for MKDIR_PARENT and MKDIR_BODY above,
4639 * the only remaining dependency is that the updated inode
4640 * count must get pushed to disk. The inode has already
4641 * been pushed into its inode buffer (via VOP_UPDATE) at
4642 * the time of the reference count change. So we need only
4643 * locate that buffer, ensure that there will be no rollback
4644 * caused by a bitmap dependency, then write the inode buffer.
4647 if (inodedep_lookup(ump
->um_fs
, inum
, 0, &inodedep
) == 0) {
4648 panic("flush_pagedep_deps: lost inode");
4651 * If the inode still has bitmap dependencies,
4652 * push them to disk.
4654 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
4655 gotit
= getdirtybuf(&inodedep
->id_buf
, MNT_WAIT
);
4659 if (gotit
&& (error
= bwrite(inodedep
->id_buf
)) != 0)
4662 if (dap
!= LIST_FIRST(diraddhdp
))
4666 * If the inode is still sitting in a buffer waiting
4667 * to be written, push it to disk.
4670 if ((error
= bread(ump
->um_devvp
,
4671 fsbtodoff(ump
->um_fs
, ino_to_fsba(ump
->um_fs
, inum
)),
4672 (int)ump
->um_fs
->fs_bsize
, &bp
)) != 0)
4674 if ((error
= bwrite(bp
)) != 0)
4678 * If we have failed to get rid of all the dependencies
4679 * then something is seriously wrong.
4681 if (dap
== LIST_FIRST(diraddhdp
)) {
4682 panic("flush_pagedep_deps: flush failed");
4691 * A large burst of file addition or deletion activity can drive the
4692 * memory load excessively high. First attempt to slow things down
4693 * using the techniques below. If that fails, this routine requests
4694 * the offending operations to fall back to running synchronously
4695 * until the memory load returns to a reasonable level.
4698 softdep_slowdown(struct vnode
*vp
)
4700 int max_softdeps_hard
;
4702 max_softdeps_hard
= max_softdeps
* 11 / 10;
4703 if (num_dirrem
< max_softdeps_hard
/ 2 &&
4704 num_inodedep
< max_softdeps_hard
)
4706 stat_sync_limit_hit
+= 1;
4711 * If memory utilization has gotten too high, deliberately slow things
4712 * down and speed up the I/O processing.
4715 request_cleanup(int resource
)
4717 struct thread
*td
= curthread
; /* XXX */
4719 KKASSERT(lock_held(&lk
));
4722 * We never hold up the filesystem syncer process.
4724 if (td
== filesys_syncer
)
4727 * First check to see if the work list has gotten backlogged.
4728 * If it has, co-opt this process to help clean up two entries.
4729 * Because this process may hold inodes locked, we cannot
4730 * handle any remove requests that might block on a locked
4731 * inode as that could lead to deadlock.
4733 if (num_on_worklist
> max_softdeps
/ 10) {
4734 process_worklist_item(NULL
, LK_NOWAIT
);
4735 process_worklist_item(NULL
, LK_NOWAIT
);
4736 stat_worklist_push
+= 2;
4741 * If we are resource constrained on inode dependencies, try
4742 * flushing some dirty inodes. Otherwise, we are constrained
4743 * by file deletions, so try accelerating flushes of directories
4744 * with removal dependencies. We would like to do the cleanup
4745 * here, but we probably hold an inode locked at this point and
4746 * that might deadlock against one that we try to clean. So,
4747 * the best that we can do is request the syncer daemon to do
4748 * the cleanup for us.
4753 stat_ino_limit_push
+= 1;
4754 req_clear_inodedeps
+= 1;
4755 stat_countp
= &stat_ino_limit_hit
;
4759 stat_blk_limit_push
+= 1;
4760 req_clear_remove
+= 1;
4761 stat_countp
= &stat_blk_limit_hit
;
4765 panic("request_cleanup: unknown type");
4768 * Hopefully the syncer daemon will catch up and awaken us.
4769 * We wait at most tickdelay before proceeding in any case.
4771 lksleep(&proc_waiting
, &lk
, 0, "softupdate",
4772 tickdelay
> 2 ? tickdelay
: 2);
4777 * Flush out a directory with at least one removal dependency in an effort to
4778 * reduce the number of dirrem, freefile, and freeblks dependency structures.
4781 clear_remove(struct thread
*td
)
4783 struct pagedep_hashhead
*pagedephd
;
4784 struct pagedep
*pagedep
;
4785 static int next
= 0;
4792 for (cnt
= 0; cnt
< pagedep_hash
; cnt
++) {
4793 pagedephd
= &pagedep_hashtbl
[next
++];
4794 if (next
>= pagedep_hash
)
4796 LIST_FOREACH(pagedep
, pagedephd
, pd_hash
) {
4797 if (LIST_FIRST(&pagedep
->pd_dirremhd
) == NULL
)
4799 mp
= pagedep
->pd_mnt
;
4800 ino
= pagedep
->pd_ino
;
4802 if ((error
= VFS_VGET(mp
, NULL
, ino
, &vp
)) != 0) {
4803 softdep_error("clear_remove: vget", error
);
4806 if ((error
= VOP_FSYNC(vp
, MNT_NOWAIT
, 0)))
4807 softdep_error("clear_remove: fsync", error
);
4808 drain_output(vp
, 0);
4817 * Clear out a block of dirty inodes in an effort to reduce
4818 * the number of inodedep dependency structures.
4820 struct clear_inodedeps_info
{
4826 clear_inodedeps_mountlist_callback(struct mount
*mp
, void *data
)
4828 struct clear_inodedeps_info
*info
= data
;
4830 if ((mp
->mnt_flag
& MNT_SOFTDEP
) && info
->fs
== VFSTOUFS(mp
)->um_fs
) {
4838 clear_inodedeps(struct thread
*td
)
4840 struct clear_inodedeps_info info
;
4841 struct inodedep_hashhead
*inodedephd
;
4842 struct inodedep
*inodedep
;
4843 static int next
= 0;
4847 ino_t firstino
, lastino
, ino
;
4851 * Pick a random inode dependency to be cleared.
4852 * We will then gather up all the inodes in its block
4853 * that have dependencies and flush them out.
4855 inodedep
= NULL
; /* avoid gcc warnings */
4856 for (cnt
= 0; cnt
< inodedep_hash
; cnt
++) {
4857 inodedephd
= &inodedep_hashtbl
[next
++];
4858 if (next
>= inodedep_hash
)
4860 if ((inodedep
= LIST_FIRST(inodedephd
)) != NULL
)
4863 if (inodedep
== NULL
) {
4868 * Ugly code to find mount point given pointer to superblock.
4870 fs
= inodedep
->id_fs
;
4873 mountlist_scan(clear_inodedeps_mountlist_callback
,
4874 &info
, MNTSCAN_FORWARD
|MNTSCAN_NOBUSY
);
4876 * Find the last inode in the block with dependencies.
4878 firstino
= rounddown2(inodedep
->id_ino
, INOPB(fs
));
4879 for (lastino
= firstino
+ INOPB(fs
) - 1; lastino
> firstino
; lastino
--)
4880 if (inodedep_lookup(fs
, lastino
, 0, &inodedep
) != 0)
4883 * Asynchronously push all but the last inode with dependencies.
4884 * Synchronously push the last inode with dependencies to ensure
4885 * that the inode block gets written to free up the inodedeps.
4887 for (ino
= firstino
; ino
<= lastino
; ino
++) {
4888 if (inodedep_lookup(fs
, ino
, 0, &inodedep
) == 0)
4891 if ((error
= VFS_VGET(info
.mp
, NULL
, ino
, &vp
)) != 0) {
4892 softdep_error("clear_inodedeps: vget", error
);
4895 if (ino
== lastino
) {
4896 if ((error
= VOP_FSYNC(vp
, MNT_WAIT
, 0)))
4897 softdep_error("clear_inodedeps: fsync1", error
);
4899 if ((error
= VOP_FSYNC(vp
, MNT_NOWAIT
, 0)))
4900 softdep_error("clear_inodedeps: fsync2", error
);
4901 drain_output(vp
, 0);
4910 * Function to determine if the buffer has outstanding dependencies
4911 * that will cause a roll-back if the buffer is written. If wantcount
4912 * is set, return number of dependencies, otherwise just yes or no.
4914 * bioops callback - hold io_token
4917 softdep_count_dependencies(struct buf
*bp
, int wantcount
)
4919 struct worklist
*wk
;
4920 struct inodedep
*inodedep
;
4921 struct indirdep
*indirdep
;
4922 struct allocindir
*aip
;
4923 struct pagedep
*pagedep
;
4930 LIST_FOREACH(wk
, &bp
->b_dep
, wk_list
) {
4931 switch (wk
->wk_type
) {
4934 inodedep
= WK_INODEDEP(wk
);
4935 if ((inodedep
->id_state
& DEPCOMPLETE
) == 0) {
4936 /* bitmap allocation dependency */
4941 if (TAILQ_FIRST(&inodedep
->id_inoupdt
)) {
4942 /* direct block pointer dependency */
4950 indirdep
= WK_INDIRDEP(wk
);
4952 LIST_FOREACH(aip
, &indirdep
->ir_deplisthd
, ai_next
) {
4953 /* indirect block pointer dependency */
4961 pagedep
= WK_PAGEDEP(wk
);
4962 for (i
= 0; i
< DAHASHSZ
; i
++) {
4964 LIST_FOREACH(dap
, &pagedep
->pd_diraddhd
[i
], da_pdlist
) {
4965 /* directory entry dependency */
4977 /* never a dependency on these blocks */
4981 panic("softdep_check_for_rollback: Unexpected type %s",
4982 TYPENAME(wk
->wk_type
));
4993 * Acquire exclusive access to a buffer. Requires softdep lock
4994 * to be held on entry. If waitfor is MNT_WAIT, may release/reacquire
4997 * Returns 1 if the buffer was locked, 0 if it was not locked or
4998 * if we had to block.
5000 * NOTE! In order to return 1 we must acquire the buffer lock prior
5001 * to any release of &lk. Once we release &lk it's all over.
5002 * We may still have to block on the (type-stable) bp in that
5003 * case, but we must then unlock it and return 0.
5006 getdirtybuf(struct buf
**bpp
, int waitfor
)
5012 * If the contents of *bpp is NULL the caller presumably lost a race.
5019 * Try to obtain the buffer lock without deadlocking on &lk.
5021 KKASSERT(lock_held(&lk
));
5022 error
= BUF_LOCK(bp
, LK_EXCLUSIVE
| LK_NOWAIT
);
5025 * If the buffer is no longer dirty the OS already wrote it
5026 * out, return failure.
5028 if ((bp
->b_flags
& B_DELWRI
) == 0) {
5034 * Finish nominal buffer locking sequence return success.
5036 * Since we are not using a normal getblk(), and UFS
5037 * isn't KVABIO aware, we must make sure that the bp
5038 * is synchronized before returning it.
5048 * If we are not being asked to wait, return 0 immediately.
5050 if (waitfor
!= MNT_WAIT
)
5054 * Once we release the softdep lock we can never return success,
5055 * but we still have to block on the type-stable buf for the caller
5056 * to be able to retry without livelocking the system.
5058 * The caller will normally retry in this case.
5061 error
= BUF_LOCK(bp
, LK_EXCLUSIVE
| LK_SLEEPFAIL
);
5069 * Wait for pending output on a vnode to complete.
5070 * Must be called with vnode locked.
5073 drain_output(struct vnode
*vp
, int islocked
)
5078 while (bio_track_active(&vp
->v_track_write
)) {
5080 bio_track_wait(&vp
->v_track_write
, 0, 0);
5088 * Called whenever a buffer that is being invalidated or reallocated
5089 * contains dependencies. This should only happen if an I/O error has
5090 * occurred. The routine is called with the buffer locked.
5092 * bioops callback - hold io_token
5095 softdep_deallocate_dependencies(struct buf
*bp
)
5097 /* nothing to do, mp lock not needed */
5098 if ((bp
->b_flags
& B_ERROR
) == 0)
5099 panic("softdep_deallocate_dependencies: dangling deps");
5100 softdep_error(bp
->b_vp
->v_mount
->mnt_stat
.f_mntfromname
, bp
->b_error
);
5101 panic("softdep_deallocate_dependencies: unrecovered I/O error");
5105 * Function to handle asynchronous write errors in the filesystem.
5108 softdep_error(char *func
, int error
)
5110 /* XXX should do something better! */
5111 kprintf("%s: got error %d while accessing filesystem\n", func
, error
);