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[netbsd-mini2440.git] / sys / fs / udf / udf_strat_rmw.c
blob009188fcd400aea4febf778cb1ccb9a173143e46
1 /* $NetBSD: udf_strat_rmw.c,v 1.21 2009/07/06 17:13:38 reinoud Exp $ */
2
3 /*
4 * Copyright (c) 2006, 2008 Reinoud Zandijk
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 */
28
29 #include <sys/cdefs.h>
30 #ifndef lint
31 __KERNEL_RCSID(0, "$NetBSD: udf_strat_rmw.c,v 1.21 2009/07/06 17:13:38 reinoud Exp $");
32 #endif /* not lint */
33
34
35 #if defined(_KERNEL_OPT)
36 #include "opt_compat_netbsd.h"
37 #endif
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/sysctl.h>
42 #include <sys/namei.h>
43 #include <sys/proc.h>
44 #include <sys/kernel.h>
45 #include <sys/vnode.h>
46 #include <miscfs/genfs/genfs_node.h>
47 #include <sys/mount.h>
48 #include <sys/buf.h>
49 #include <sys/file.h>
50 #include <sys/device.h>
51 #include <sys/disklabel.h>
52 #include <sys/ioctl.h>
53 #include <sys/malloc.h>
54 #include <sys/dirent.h>
55 #include <sys/stat.h>
56 #include <sys/conf.h>
57 #include <sys/kauth.h>
58 #include <sys/kthread.h>
59 #include <dev/clock_subr.h>
60
61 #include <fs/udf/ecma167-udf.h>
62 #include <fs/udf/udf_mount.h>
63
64 #include "udf.h"
65 #include "udf_subr.h"
66 #include "udf_bswap.h"
67
68
69 #define VTOI(vnode) ((struct udf_node *) (vnode)->v_data)
70 #define PRIV(ump) ((struct strat_private *) (ump)->strategy_private)
71 #define BTOE(buf) ((struct udf_eccline *) ((buf)->b_private))
72
73 /* --------------------------------------------------------------------- */
74
75 #define UDF_MAX_PACKET_SIZE 64 /* DONT change this */
76
77 /* sheduler states */
78 #define UDF_SHED_WAITING 1 /* waiting on timeout */
79 #define UDF_SHED_READING 2
80 #define UDF_SHED_WRITING 3
81 #define UDF_SHED_SEQWRITING 4
82 #define UDF_SHED_IDLE 5 /* refcnt'd */
83 #define UDF_SHED_FREE 6 /* recycleable */
84 #define UDF_SHED_MAX 6+1
85
86 /* flags */
87 #define ECC_LOCKED 0x01 /* prevent access */
88 #define ECC_WANTED 0x02 /* trying access */
89 #define ECC_SEQWRITING 0x04 /* sequential queue */
90 #define ECC_FLOATING 0x08 /* not queued yet */
91
92 #define ECC_WAITTIME 10
93
94
95 TAILQ_HEAD(ecclineq, udf_eccline);
96 struct udf_eccline {
97 struct udf_mount *ump;
98 uint64_t present; /* preserve these */
99 uint64_t readin; /* bitmap */
100 uint64_t dirty; /* bitmap */
101 uint64_t error; /* bitmap */
102 uint32_t refcnt;
103
104 struct timespec wait_time;
105 uint32_t flags;
106 uint32_t start_sector; /* physical */
107
108 const char *fname;
109 int sline;
110
111 struct buf *buf;
112 void *blob;
113
114 struct buf *bufs[UDF_MAX_PACKET_SIZE];
115 uint32_t bufs_bpos[UDF_MAX_PACKET_SIZE];
116 int bufs_len[UDF_MAX_PACKET_SIZE];
117
118 int queued_on; /* on which BUFQ list */
119 LIST_ENTRY(udf_eccline) hashchain; /* on sector lookup */
120 };
121
122
123 struct strat_private {
124 lwp_t *queue_lwp;
125 kcondvar_t discstrat_cv; /* to wait on */
126 kmutex_t discstrat_mutex; /* disc strategy */
127 kmutex_t seqwrite_mutex; /* protect mappings */
128
129 int thread_running; /* thread control */
130 int run_thread; /* thread control */
131 int thread_finished; /* thread control */
132 int cur_queue;
133
134 int num_floating;
135 int num_queued[UDF_SHED_MAX];
136 struct bufq_state *queues[UDF_SHED_MAX];
137 struct timespec last_queued[UDF_SHED_MAX];
138 struct disk_strategy old_strategy_setting;
139
140 struct pool eccline_pool;
141 struct pool ecclineblob_pool;
142 LIST_HEAD(, udf_eccline) eccline_hash[UDF_ECCBUF_HASHSIZE];
143 };
144
145 /* --------------------------------------------------------------------- */
146
147 #define UDF_LOCK_ECCLINE(eccline) udf_lock_eccline(eccline, __FILE__, __LINE__)
148 #define UDF_UNLOCK_ECCLINE(eccline) udf_unlock_eccline(eccline, __FILE__, __LINE__)
149
150 /* can be called with or without discstrat lock */
151 static void
152 udf_lock_eccline(struct udf_eccline *eccline, const char *fname, int sline)
153 {
154 struct strat_private *priv = PRIV(eccline->ump);
155 int waslocked, ret;
156
157 KASSERT(mutex_owned(&priv->discstrat_mutex));
158
159 waslocked = mutex_owned(&priv->discstrat_mutex);
160 if (!waslocked)
161 mutex_enter(&priv->discstrat_mutex);
162
163 /* wait until its unlocked first */
164 eccline->refcnt++;
165 while (eccline->flags & ECC_LOCKED) {
166 DPRINTF(ECCLINE, ("waiting for lock at %s:%d\n",
167 fname, sline));
168 DPRINTF(ECCLINE, ("was locked at %s:%d\n",
169 eccline->fname, eccline->sline));
170 eccline->flags |= ECC_WANTED;
171 ret = cv_timedwait(&priv->discstrat_cv, &priv->discstrat_mutex,
172 hz/8);
173 if (ret == EWOULDBLOCK)
174 DPRINTF(LOCKING, ("eccline lock helt, waiting for "
175 "release"));
176 }
177 eccline->flags |= ECC_LOCKED;
178 eccline->flags &= ~ECC_WANTED;
179 eccline->refcnt--;
180
181 eccline->fname = fname;
182 eccline->sline = sline;
183
184 if (!waslocked)
185 mutex_exit(&priv->discstrat_mutex);
186 }
187
188
189 /* can be called with or without discstrat lock */
190 static void
191 udf_unlock_eccline(struct udf_eccline *eccline, const char *fname, int sline)
192 {
193 struct strat_private *priv = PRIV(eccline->ump);
194 int waslocked;
195
196 KASSERT(mutex_owned(&priv->discstrat_mutex));
197
198 waslocked = mutex_owned(&priv->discstrat_mutex);
199 if (!waslocked)
200 mutex_enter(&priv->discstrat_mutex);
201
202 eccline->flags &= ~ECC_LOCKED;
203 cv_broadcast(&priv->discstrat_cv);
204
205 if (!waslocked)
206 mutex_exit(&priv->discstrat_mutex);
207 }
208
209
210 /* NOTE discstrat_mutex should be held! */
211 static void
212 udf_dispose_eccline(struct udf_eccline *eccline)
213 {
214 struct strat_private *priv = PRIV(eccline->ump);
215
216 KASSERT(mutex_owned(&priv->discstrat_mutex));
217
218 DPRINTF(ECCLINE, ("dispose eccline with start sector %d, "
219 "present %0"PRIx64"\n", eccline->start_sector,
220 eccline->present));
221
222 KASSERT(eccline->refcnt == 0);
223 KASSERT(eccline->dirty == 0);
224 KASSERT(eccline->queued_on == 0);
225 KASSERT(eccline->flags & ECC_FLOATING);
226 KASSERT(eccline->flags & ECC_LOCKED);
227
228 LIST_REMOVE(eccline, hashchain);
229 priv->num_floating--;
230
231 putiobuf(eccline->buf);
232 pool_put(&priv->ecclineblob_pool, eccline->blob);
233 pool_put(&priv->eccline_pool, eccline);
234 }
235
236
237 /* NOTE discstrat_mutex should be held! */
238 static void
239 udf_push_eccline(struct udf_eccline *eccline, int newqueue)
240 {
241 struct strat_private *priv = PRIV(eccline->ump);
242
243 KASSERT(mutex_owned(&priv->discstrat_mutex));
244
245 DPRINTF(PARANOIA, ("DEBUG: buf %p pushed on queue %d\n", eccline->buf, newqueue));
246
247 KASSERT(eccline->queued_on == 0);
248 KASSERT(eccline->flags & ECC_FLOATING);
249
250 /* set buffer block numbers to make sure its queued correctly */
251 eccline->buf->b_lblkno = eccline->start_sector;
252 eccline->buf->b_blkno = eccline->start_sector;
253 eccline->buf->b_rawblkno = eccline->start_sector;
254
255 vfs_timestamp(&priv->last_queued[newqueue]);
256 eccline->flags &= ~ECC_FLOATING;
257 priv->num_floating--;
258 eccline->queued_on = newqueue;
259 priv->num_queued[newqueue]++;
260 bufq_put(priv->queues[newqueue], eccline->buf);
261
262 UDF_UNLOCK_ECCLINE(eccline);
263
264 /* XXX tickle disc strategy statemachine */
265 if (newqueue != UDF_SHED_IDLE)
266 cv_signal(&priv->discstrat_cv);
267 }
268
269
270 static struct udf_eccline *
271 udf_peek_eccline(struct strat_private *priv, int queued_on)
272 {
273 struct udf_eccline *eccline;
274 struct buf *buf;
275
276 KASSERT(mutex_owned(&priv->discstrat_mutex));
277
278 for(;;) {
279 buf = bufq_peek(priv->queues[queued_on]);
280 /* could have been a race, but we'll revisit later */
281 if (buf == NULL)
282 return NULL;
283
284 eccline = BTOE(buf);
285 UDF_LOCK_ECCLINE(eccline);
286
287 /* might have changed before we obtained the lock */
288 if (eccline->queued_on == queued_on)
289 break;
290
291 UDF_UNLOCK_ECCLINE(eccline);
292 }
293
294 KASSERT(eccline->queued_on == queued_on);
295 KASSERT((eccline->flags & ECC_FLOATING) == 0);
296
297 DPRINTF(PARANOIA, ("DEBUG: buf %p peeked at queue %d\n",
298 eccline->buf, queued_on));
299
300 return eccline;
301 }
302
303
304 static struct udf_eccline *
305 udf_pop_eccline(struct strat_private *priv, int queued_on)
306 {
307 struct udf_eccline *eccline;
308 struct buf *buf;
309
310 KASSERT(mutex_owned(&priv->discstrat_mutex));
311
312 for(;;) {
313 buf = bufq_get(priv->queues[queued_on]);
314 if (buf == NULL) {
315 // KASSERT(priv->num_queued[queued_on] == 0);
316 return NULL;
317 }
318
319 eccline = BTOE(buf);
320 UDF_LOCK_ECCLINE(eccline);
321
322 /* might have changed before we obtained the lock */
323 if (eccline->queued_on == queued_on)
324 break;
325
326 UDF_UNLOCK_ECCLINE(eccline);
327 }
328
329 KASSERT(eccline->queued_on == queued_on);
330 KASSERT((eccline->flags & ECC_FLOATING) == 0);
331
332 priv->num_queued[queued_on]--;
333 eccline->queued_on = 0;
334
335 eccline->flags |= ECC_FLOATING;
336 priv->num_floating++;
337
338 DPRINTF(PARANOIA, ("DEBUG: buf %p popped from queue %d\n",
339 eccline->buf, queued_on));
340
341 return eccline;
342 }
343
344
345 static void
346 udf_unqueue_eccline(struct strat_private *priv, struct udf_eccline *eccline)
347 {
348 struct buf *ret;
349
350 UDF_LOCK_ECCLINE(eccline);
351 if (eccline->queued_on == 0) {
352 KASSERT(eccline->flags & ECC_FLOATING);
353 return;
354 }
355
356 ret = bufq_cancel(priv->queues[eccline->queued_on], eccline->buf);
357 KASSERT(ret == eccline->buf);
358
359 priv->num_queued[eccline->queued_on]--;
360 eccline->queued_on = 0;
361
362 eccline->flags |= ECC_FLOATING;
363 priv->num_floating++;
364 }
365
366
367 static struct udf_eccline *
368 udf_geteccline(struct udf_mount *ump, uint32_t sector, int flags)
369 {
370 struct strat_private *priv = PRIV(ump);
371 struct udf_eccline *eccline;
372 uint32_t start_sector, lb_size, blobsize;
373 uint8_t *eccline_blob;
374 int line, line_offset;
375 int num_busy, ret;
376
377 mutex_enter(&priv->discstrat_mutex);
378
379 /* lookup in our line cache hashtable */
380 line_offset = sector % ump->packet_size;
381 start_sector = sector - line_offset;
382 line = (start_sector/ump->packet_size) & UDF_ECCBUF_HASHMASK;
383
384 KASSERT(priv->thread_running);
385
386 retry:
387 DPRINTF(ECCLINE, ("get line sector %d, line %d\n", sector, line));
388 LIST_FOREACH(eccline, &priv->eccline_hash[line], hashchain) {
389 if (eccline->start_sector == start_sector) {
390 DPRINTF(ECCLINE, ("\tfound eccline, start_sector %d\n",
391 eccline->start_sector));
392 udf_unqueue_eccline(priv, eccline);
393
394 mutex_exit(&priv->discstrat_mutex);
395 return eccline;
396 }
397 }
398
399 /* not found in eccline cache */
400 DPRINTF(ECCLINE, ("\tnot found in eccline cache\n"));
401
402 lb_size = udf_rw32(ump->logical_vol->lb_size);
403 blobsize = ump->packet_size * lb_size;
404
405 /* dont allow too many pending requests */
406 DPRINTF(ECCLINE, ("\tallocating new eccline\n"));
407 num_busy = (priv->num_queued[UDF_SHED_SEQWRITING] + priv->num_floating);
408 if ((flags & ECC_SEQWRITING) && (num_busy > UDF_ECCLINE_MAXBUSY)) {
409 ret = cv_timedwait(&priv->discstrat_cv,
410 &priv->discstrat_mutex, hz/8);
411 goto retry;
412 }
413
414 eccline_blob = pool_get(&priv->ecclineblob_pool, PR_NOWAIT);
415 eccline = pool_get(&priv->eccline_pool, PR_NOWAIT);
416 if ((eccline_blob == NULL) || (eccline == NULL)) {
417 if (eccline_blob)
418 pool_put(&priv->ecclineblob_pool, eccline_blob);
419 if (eccline)
420 pool_put(&priv->eccline_pool, eccline);
421
422 /* out of memory for now; canibalise freelist */
423 eccline = udf_pop_eccline(priv, UDF_SHED_FREE);
424 if (eccline == NULL) {
425 /* serious trouble; wait and retry */
426 cv_timedwait(&priv->discstrat_cv,
427 &priv->discstrat_mutex, hz/8);
428 goto retry;
429 }
430
431 /* push back line if we're waiting for it or its locked */
432 if (eccline->flags & ECC_WANTED) {
433 /* we won a race, but someone else needed it */
434 udf_push_eccline(eccline, UDF_SHED_FREE);
435 goto retry;
436 }
437
438 /* unlink this entry */
439 LIST_REMOVE(eccline, hashchain);
440 KASSERT(eccline->flags & ECC_FLOATING);
441 KASSERT(eccline->queued_on == 0);
442
443 eccline_blob = eccline->blob;
444 eccline->flags = ECC_FLOATING | ECC_LOCKED;
445 } else {
446 eccline->flags = ECC_FLOATING | ECC_LOCKED;
447 priv->num_floating++;
448 }
449
450 eccline->queued_on = 0;
451 eccline->blob = eccline_blob;
452 eccline->buf = getiobuf(NULL, true);
453 eccline->buf->b_private = eccline; /* IMPORTANT */
454
455 /* initialise eccline blob */
456 /* XXX memset expensive and strictly not needed XXX */
457 memset(eccline->blob, 0, blobsize);
458
459 eccline->ump = ump;
460 eccline->present = eccline->readin = eccline->dirty = 0;
461 eccline->error = 0;
462 eccline->refcnt = 0;
463 memset(eccline->bufs, 0, UDF_MAX_PACKET_SIZE * sizeof(struct buf *));
464
465 eccline->start_sector = start_sector;
466 eccline->buf->b_lblkno = start_sector;
467 eccline->buf->b_blkno = start_sector;
468 eccline->buf->b_rawblkno = start_sector;
469
470 LIST_INSERT_HEAD(&priv->eccline_hash[line], eccline, hashchain);
471
472 /*
473 * TODO possible optimalisation for checking overlap with partitions
474 * to get a clue on future eccline usage
475 */
476
477 KASSERT(eccline->refcnt == 0);
478 KASSERT(eccline->flags & ECC_FLOATING);
479 KASSERT(eccline->flags & ECC_LOCKED);
480 mutex_exit(&priv->discstrat_mutex);
481
482 return eccline;
483 }
484
485
486 static void
487 udf_puteccline(struct udf_eccline *eccline)
488 {
489 struct strat_private *priv = PRIV(eccline->ump);
490 struct udf_mount *ump = eccline->ump;
491 uint64_t allbits = ((uint64_t) 1 << ump->packet_size)-1;
492 int new_queue;
493
494 mutex_enter(&priv->discstrat_mutex);
495
496 DPRINTF(ECCLINE, ("put eccline start sector %d, refcnt %d\n",
497 eccline->start_sector, eccline->refcnt));
498
499 KASSERT(eccline->flags & ECC_LOCKED);
500 KASSERT(eccline->flags & ECC_FLOATING);
501
502 /* clear all read bits that are already read in */
503 if (eccline->readin & eccline->present)
504 eccline->readin &= (~eccline->present) & allbits;
505
506 /* if we have active nodes we dont set it on seqwriting */
507 if (eccline->refcnt > 1)
508 eccline->flags &= ~ECC_SEQWRITING;
509
510 /* select state */
511 new_queue = UDF_SHED_FREE;
512 if (eccline->refcnt > 0)
513 new_queue = UDF_SHED_IDLE;
514 if (eccline->flags & ECC_WANTED)
515 new_queue = UDF_SHED_IDLE;
516 if (eccline->readin)
517 new_queue = UDF_SHED_READING;
518 if (eccline->dirty) {
519 new_queue = UDF_SHED_WAITING;
520 vfs_timestamp(&eccline->wait_time);
521 eccline->wait_time.tv_sec += ECC_WAITTIME;
522
523 if (eccline->present == allbits) {
524 new_queue = UDF_SHED_WRITING;
525 if (eccline->flags & ECC_SEQWRITING)
526 new_queue = UDF_SHED_SEQWRITING;
527 }
528 }
529 udf_push_eccline(eccline, new_queue);
530
531 mutex_exit(&priv->discstrat_mutex);
532 }
533
534 /* --------------------------------------------------------------------- */
535
536 static int
537 udf_create_nodedscr_rmw(struct udf_strat_args *args)
538 {
539 union dscrptr **dscrptr = &args->dscr;
540 struct udf_mount *ump = args->ump;
541 struct long_ad *icb = args->icb;
542 struct udf_eccline *eccline;
543 uint64_t bit;
544 uint32_t sectornr, lb_size, dummy;
545 uint8_t *mem;
546 int error, eccsect;
547
548 error = udf_translate_vtop(ump, icb, &sectornr, &dummy);
549 if (error)
550 return error;
551
552 lb_size = udf_rw32(ump->logical_vol->lb_size);
553
554 /* get our eccline */
555 eccline = udf_geteccline(ump, sectornr, 0);
556 eccsect = sectornr - eccline->start_sector;
557
558 bit = (uint64_t) 1 << eccsect;
559 eccline->readin &= ~bit; /* just in case */
560 eccline->present |= bit;
561 eccline->dirty &= ~bit; /* Err... euhm... clean? */
562
563 eccline->refcnt++;
564
565 /* clear space */
566 mem = ((uint8_t *) eccline->blob) + eccsect * lb_size;
567 memset(mem, 0, lb_size);
568
569 udf_puteccline(eccline);
570
571 *dscrptr = (union dscrptr *) mem;
572 return 0;
573 }
574
575
576 static void
577 udf_free_nodedscr_rmw(struct udf_strat_args *args)
578 {
579 struct udf_mount *ump = args->ump;
580 struct long_ad *icb = args->icb;
581 struct udf_eccline *eccline;
582 uint64_t bit;
583 uint32_t sectornr, dummy;
584 int error, eccsect;
585
586 error = udf_translate_vtop(ump, icb, &sectornr, &dummy);
587 if (error)
588 return;
589
590 /* get our eccline */
591 eccline = udf_geteccline(ump, sectornr, 0);
592 eccsect = sectornr - eccline->start_sector;
593
594 bit = (uint64_t) 1 << eccsect;
595 KASSERT(eccline->present & bit);
596
597 eccline->readin &= ~bit; /* just in case */
598 /* XXX eccline->dirty? */
599
600 KASSERT(eccline->refcnt >= 1);
601 eccline->refcnt--;
602
603 udf_puteccline(eccline);
604 }
605
606
607 static int
608 udf_read_nodedscr_rmw(struct udf_strat_args *args)
609 {
610 union dscrptr **dscrptr = &args->dscr;
611 struct udf_mount *ump = args->ump;
612 struct long_ad *icb = args->icb;
613 struct strat_private *priv;
614 struct udf_eccline *eccline;
615 uint64_t bit;
616 uint32_t sectornr, dummy;
617 uint8_t *pos;
618 int sector_size = ump->discinfo.sector_size;
619 int lb_size = udf_rw32(ump->logical_vol->lb_size);
620 int i, error, dscrlen, eccsect;
621
622 lb_size = lb_size;
623 KASSERT(sector_size == lb_size);
624 error = udf_translate_vtop(ump, icb, &sectornr, &dummy);
625 if (error)
626 return error;
627
628 /* get our eccline */
629 eccline = udf_geteccline(ump, sectornr, 0);
630 eccsect = sectornr - eccline->start_sector;
631
632 bit = (uint64_t) 1 << eccsect;
633 if ((eccline->present & bit) == 0) {
634 /* mark bit for readin */
635 eccline->readin |= bit;
636 eccline->refcnt++; /* prevent recycling */
637 KASSERT(eccline->bufs[eccsect] == NULL);
638 udf_puteccline(eccline);
639
640 /* wait for completion */
641 priv = PRIV(eccline->ump);
642 mutex_enter(&priv->discstrat_mutex);
643 while (((eccline->present | eccline->error) & bit) == 0) {
644 error = cv_timedwait(&priv->discstrat_cv,
645 &priv->discstrat_mutex,
646 hz/8);
647 if (error == EWOULDBLOCK)
648 DPRINTF(LOCKING, ("eccline waiting for read\n"));
649 }
650 mutex_exit(&priv->discstrat_mutex);
651
652 /* reget our line */
653 eccline = udf_geteccline(ump, sectornr, 0);
654 KASSERT(eccline->refcnt >= 1);
655 eccline->refcnt--; /* undo refcnt */
656
657 if (eccline->error & bit) {
658 *dscrptr = NULL;
659 udf_puteccline(eccline);
660 return EIO; /* XXX error code */
661 }
662 }
663
664 *dscrptr = (union dscrptr *)
665 (((uint8_t *) eccline->blob) + eccsect * sector_size);
666
667 /* code from read_phys_descr */
668 /* check if its a valid tag */
669 error = udf_check_tag(*dscrptr);
670 if (error) {
671 /* check if its an empty block */
672 pos = (uint8_t *) *dscrptr;
673 for (i = 0; i < sector_size; i++, pos++) {
674 if (*pos) break;
675 }
676 if (i == sector_size) {
677 /* return no error but with no dscrptr */
678 error = 0;
679 }
680 *dscrptr = NULL;
681 udf_puteccline(eccline);
682 return error;
683 }
684
685 /* calculate descriptor size */
686 dscrlen = udf_tagsize(*dscrptr, sector_size);
687 error = udf_check_tag_payload(*dscrptr, dscrlen);
688 if (error) {
689 *dscrptr = NULL;
690 udf_puteccline(eccline);
691 return error;
692 }
693
694 /* we have a hold since it has a node descriptor */
695 eccline->refcnt++;
696 udf_puteccline(eccline);
697
698 return 0;
699 }
700
701
702 static int
703 udf_write_nodedscr_rmw(struct udf_strat_args *args)
704 {
705 union dscrptr *dscrptr = args->dscr;
706 struct udf_mount *ump = args->ump;
707 struct long_ad *icb = args->icb;
708 struct udf_node *udf_node = args->udf_node;
709 struct udf_eccline *eccline;
710 uint64_t bit;
711 uint32_t sectornr, logsectornr, dummy;
712 // int waitfor = args->waitfor;
713 int sector_size = ump->discinfo.sector_size;
714 int lb_size = udf_rw32(ump->logical_vol->lb_size);
715 int error, eccsect;
716
717 lb_size = lb_size;
718 KASSERT(sector_size == lb_size);
719 sectornr = 0;
720 error = udf_translate_vtop(ump, icb, &sectornr, &dummy);
721 if (error)
722 return error;
723
724 /* paranoia: add reference to the vnode to prevent recycling */
725 vhold(udf_node->vnode);
726
727 /* get our eccline */
728 eccline = udf_geteccline(ump, sectornr, 0);
729 eccsect = sectornr - eccline->start_sector;
730
731 bit = (uint64_t) 1 << eccsect;
732
733 /* old callback still pending? */
734 if (eccline->bufs[eccsect]) {
735 DPRINTF(WRITE, ("udf_write_nodedscr_rmw: writing descriptor"
736 " over buffer?\n"));
737 nestiobuf_done(eccline->bufs[eccsect],
738 eccline->bufs_len[eccsect],
739 0);
740 eccline->bufs[eccsect] = NULL;
741 }
742
743 /* set sector number in the descriptor and validate */
744 dscrptr = (union dscrptr *)
745 (((uint8_t *) eccline->blob) + eccsect * sector_size);
746 KASSERT(dscrptr == args->dscr);
747
748 logsectornr = udf_rw32(icb->loc.lb_num);
749 dscrptr->tag.tag_loc = udf_rw32(logsectornr);
750 udf_validate_tag_and_crc_sums(dscrptr);
751
752 udf_fixup_node_internals(ump, (uint8_t *) dscrptr, UDF_C_NODE);
753
754 /* set our flags */
755 KASSERT(eccline->present & bit);
756 eccline->dirty |= bit;
757
758 KASSERT(udf_tagsize(dscrptr, sector_size) <= sector_size);
759
760 udf_node->outstanding_nodedscr--;
761 if (udf_node->outstanding_nodedscr == 0) {
762 /* XXX still using wakeup! */
763 UDF_UNLOCK_NODE(udf_node, 0);
764 wakeup(&udf_node->outstanding_nodedscr);
765 }
766 holdrele(udf_node->vnode);
767 udf_puteccline(eccline);
768
769 /* XXX waitfor not used */
770 return 0;
771 }
772
773
774 static void
775 udf_queuebuf_rmw(struct udf_strat_args *args)
776 {
777 struct udf_mount *ump = args->ump;
778 struct buf *buf = args->nestbuf;
779 struct desc_tag *tag;
780 struct strat_private *priv = PRIV(ump);
781 struct udf_eccline *eccline;
782 struct long_ad *node_ad_cpy;
783 uint64_t bit, *lmapping, *pmapping, *lmappos, *pmappos, blknr;
784 uint32_t buf_len, len, sectors, sectornr, our_sectornr;
785 uint32_t bpos;
786 uint16_t vpart_num;
787 uint8_t *fidblk, *src, *dst;
788 int sector_size = ump->discinfo.sector_size;
789 int blks = sector_size / DEV_BSIZE;
790 int eccsect, what, queue, error;
791
792 KASSERT(ump);
793 KASSERT(buf);
794 KASSERT(buf->b_iodone == nestiobuf_iodone);
795
796 blknr = buf->b_blkno;
797 our_sectornr = blknr / blks;
798
799 what = buf->b_udf_c_type;
800 queue = UDF_SHED_READING;
801 if ((buf->b_flags & B_READ) == 0) {
802 /* writing */
803 queue = UDF_SHED_SEQWRITING;
804 if (what == UDF_C_ABSOLUTE)
805 queue = UDF_SHED_WRITING;
806 if (what == UDF_C_DSCR)
807 queue = UDF_SHED_WRITING;
808 if (what == UDF_C_NODE)
809 queue = UDF_SHED_WRITING;
810 }
811
812 if (queue == UDF_SHED_READING) {
813 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw READ %p : sector %d type %d,"
814 "b_resid %d, b_bcount %d, b_bufsize %d\n",
815 buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
816 buf->b_resid, buf->b_bcount, buf->b_bufsize));
817
818 /* mark bits for reading */
819 buf_len = buf->b_bcount;
820 sectornr = our_sectornr;
821 eccline = udf_geteccline(ump, sectornr, 0);
822 eccsect = sectornr - eccline->start_sector;
823 bpos = 0;
824 while (buf_len) {
825 len = MIN(buf_len, sector_size);
826 if ((eccsect < 0) || (eccsect >= ump->packet_size)) {
827 udf_puteccline(eccline);
828 eccline = udf_geteccline(ump, sectornr, 0);
829 eccsect = sectornr - eccline->start_sector;
830 }
831 bit = (uint64_t) 1 << eccsect;
832 error = eccline->error & bit ? EIO : 0;
833 if (eccline->present & bit) {
834 src = (uint8_t *) eccline->blob +
835 eccsect * sector_size;
836 dst = (uint8_t *) buf->b_data + bpos;
837 if (!error)
838 memcpy(dst, src, len);
839 nestiobuf_done(buf, len, error);
840 } else {
841 eccline->readin |= bit;
842 KASSERT(eccline->bufs[eccsect] == NULL);
843 eccline->bufs[eccsect] = buf;
844 eccline->bufs_bpos[eccsect] = bpos;
845 eccline->bufs_len[eccsect] = len;
846 }
847 bpos += sector_size;
848 eccsect++;
849 sectornr++;
850 buf_len -= len;
851 }
852 udf_puteccline(eccline);
853 return;
854 }
855
856 if (queue == UDF_SHED_WRITING) {
857 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw WRITE %p : sector %d "
858 "type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
859 buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
860 buf->b_resid, buf->b_bcount, buf->b_bufsize));
861
862 /* if we have FIDs fixup using buffer's sector number(s) */
863 if (buf->b_udf_c_type == UDF_C_FIDS)
864 panic("UDF_C_FIDS in SHED_WRITING!\n");
865
866 udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
867
868 /* copy parts into the bufs and set for writing */
869 buf_len = buf->b_bcount;
870 sectornr = our_sectornr;
871 eccline = udf_geteccline(ump, sectornr, 0);
872 eccsect = sectornr - eccline->start_sector;
873 bpos = 0;
874 while (buf_len) {
875 len = MIN(buf_len, sector_size);
876 if ((eccsect < 0) || (eccsect >= ump->packet_size)) {
877 udf_puteccline(eccline);
878 eccline = udf_geteccline(ump, sectornr, 0);
879 eccsect = sectornr - eccline->start_sector;
880 }
881 bit = (uint64_t) 1 << eccsect;
882 KASSERT((eccline->readin & bit) == 0);
883 eccline->present |= bit;
884 eccline->dirty |= bit;
885 if (eccline->bufs[eccsect]) {
886 /* old callback still pending */
887 nestiobuf_done(eccline->bufs[eccsect],
888 eccline->bufs_len[eccsect],
889 0);
890 eccline->bufs[eccsect] = NULL;
891 }
892
893 src = (uint8_t *) buf->b_data + bpos;
894 dst = (uint8_t *) eccline->blob + eccsect * sector_size;
895 if (len != sector_size)
896 memset(dst, 0, sector_size);
897 memcpy(dst, src, len);
898
899 /* note that its finished for this extent */
900 eccline->bufs[eccsect] = NULL;
901 nestiobuf_done(buf, len, 0);
902
903 bpos += sector_size;
904 eccsect++;
905 sectornr++;
906 buf_len -= len;
907 }
908 udf_puteccline(eccline);
909 return;
910
911 }
912
913 /* sequential writing */
914 KASSERT(queue == UDF_SHED_SEQWRITING);
915 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw SEQWRITE %p : sector XXXX "
916 "type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
917 buf, buf->b_udf_c_type, buf->b_resid, buf->b_bcount,
918 buf->b_bufsize));
919 /*
920 * Buffers should not have been allocated to disc addresses yet on
921 * this queue. Note that a buffer can get multiple extents allocated.
922 * Note that it *looks* like the normal writing but its different in
923 * the details.
924 *
925 * lmapping contains lb_num relative to base partition.
926 *
927 * XXX should we try to claim/organize the allocated memory to
928 * block-aligned pieces?
929 */
930 mutex_enter(&priv->seqwrite_mutex);
931
932 lmapping = ump->la_lmapping;
933 node_ad_cpy = ump->la_node_ad_cpy;
934
935 /* logically allocate buf and map it in the file */
936 udf_late_allocate_buf(ump, buf, lmapping, node_ad_cpy, &vpart_num);
937
938 /* if we have FIDs, fixup using the new allocation table */
939 if (buf->b_udf_c_type == UDF_C_FIDS) {
940 buf_len = buf->b_bcount;
941 bpos = 0;
942 lmappos = lmapping;
943 while (buf_len) {
944 sectornr = *lmappos++;
945 len = MIN(buf_len, sector_size);
946 fidblk = (uint8_t *) buf->b_data + bpos;
947 udf_fixup_fid_block(fidblk, sector_size,
948 0, len, sectornr);
949 bpos += len;
950 buf_len -= len;
951 }
952 }
953 if (buf->b_udf_c_type == UDF_C_METADATA_SBM) {
954 if (buf->b_lblkno == 0) {
955 /* update the tag location inside */
956 tag = (struct desc_tag *) buf->b_data;
957 tag->tag_loc = udf_rw32(*lmapping);
958 udf_validate_tag_and_crc_sums(buf->b_data);
959 }
960 }
961 udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
962
963 /*
964 * Translate new mappings in lmapping to pmappings.
965 * pmapping to contain lb_nums as used for disc adressing.
966 */
967 pmapping = ump->la_pmapping;
968 sectors = (buf->b_bcount + sector_size -1) / sector_size;
969 udf_translate_vtop_list(ump, sectors, vpart_num, lmapping, pmapping);
970
971 /* copy parts into the bufs and set for writing */
972 pmappos = pmapping;
973 buf_len = buf->b_bcount;
974 sectornr = *pmappos++;
975 eccline = udf_geteccline(ump, sectornr, ECC_SEQWRITING);
976 eccsect = sectornr - eccline->start_sector;
977 bpos = 0;
978 while (buf_len) {
979 len = MIN(buf_len, sector_size);
980 eccsect = sectornr - eccline->start_sector;
981 if ((eccsect < 0) || (eccsect >= ump->packet_size)) {
982 eccline->flags |= ECC_SEQWRITING;
983 udf_puteccline(eccline);
984 eccline = udf_geteccline(ump, sectornr, ECC_SEQWRITING);
985 eccsect = sectornr - eccline->start_sector;
986 }
987 bit = (uint64_t) 1 << eccsect;
988 KASSERT((eccline->readin & bit) == 0);
989 eccline->present |= bit;
990 eccline->dirty |= bit;
991 eccline->bufs[eccsect] = NULL;
992
993 src = (uint8_t *) buf->b_data + bpos;
994 dst = (uint8_t *)
995 eccline->blob + eccsect * sector_size;
996 if (len != sector_size)
997 memset(dst, 0, sector_size);
998 memcpy(dst, src, len);
999
1000 /* note that its finished for this extent */
1001 nestiobuf_done(buf, len, 0);
1002
1003 bpos += sector_size;
1004 sectornr = *pmappos++;
1005 buf_len -= len;
1006 }
1007 eccline->flags |= ECC_SEQWRITING;
1008 udf_puteccline(eccline);
1009 mutex_exit(&priv->seqwrite_mutex);
1010 }
1011
1012 /* --------------------------------------------------------------------- */
1013
1014 static void
1015 udf_shedule_read_callback(struct buf *buf)
1016 {
1017 struct udf_eccline *eccline = BTOE(buf);
1018 struct udf_mount *ump = eccline->ump;
1019 uint64_t bit;
1020 uint8_t *src, *dst;
1021 int sector_size = ump->discinfo.sector_size;
1022 int error, i, len;
1023
1024 DPRINTF(ECCLINE, ("read callback called on buf %p\n", buf));
1025
1026 /* post process read action */
1027 KASSERT(eccline->flags & ECC_LOCKED);
1028 error = buf->b_error;
1029 for (i = 0; i < ump->packet_size; i++) {
1030 bit = (uint64_t) 1 << i;
1031 src = (uint8_t *) buf->b_data + i * sector_size;
1032 dst = (uint8_t *) eccline->blob + i * sector_size;
1033 if (eccline->present & bit)
1034 continue;
1035 eccline->present |= bit;
1036 if (error)
1037 eccline->error |= bit;
1038 if (eccline->bufs[i]) {
1039 dst = (uint8_t *) eccline->bufs[i]->b_data +
1040 eccline->bufs_bpos[i];
1041 len = eccline->bufs_len[i];
1042 if (!error)
1043 memcpy(dst, src, len);
1044 nestiobuf_done(eccline->bufs[i], len, error);
1045 eccline->bufs[i] = NULL;
1046 }
1047
1048 }
1049 KASSERT(buf->b_data == eccline->blob);
1050 KASSERT(eccline->present == ((uint64_t) 1 << ump->packet_size)-1);
1051
1052 /*
1053 * XXX TODO what to do on read errors? read in all sectors
1054 * synchronously and allocate a sparable entry?
1055 */
1056
1057 udf_puteccline(eccline);
1058 DPRINTF(ECCLINE, ("read callback finished\n"));
1059 }
1060
1061
1062 static void
1063 udf_shedule_write_callback(struct buf *buf)
1064 {
1065 struct udf_eccline *eccline = BTOE(buf);
1066 struct udf_mount *ump = eccline->ump;
1067 uint64_t bit;
1068 int error, i;
1069
1070 DPRINTF(ECCLINE, ("write callback called on buf %p\n", buf));
1071
1072 /* post process write action */
1073 KASSERT(eccline->flags & ECC_LOCKED);
1074 error = buf->b_error;
1075 for (i = 0; i < ump->packet_size; i++) {
1076 bit = (uint64_t) 1 << i;
1077 if ((eccline->dirty & bit) == 0)
1078 continue;
1079 if (error) {
1080 eccline->error |= bit;
1081 } else {
1082 eccline->dirty &= ~bit;
1083 }
1084
1085 KASSERT(eccline->bufs[i] == 0);
1086 }
1087 KASSERT(eccline->dirty == 0);
1088 KASSERT(error == 0);
1089
1090 /*
1091 * XXX TODO on write errors allocate a sparable entry and reissue
1092 */
1093
1094 udf_puteccline(eccline);
1095 DPRINTF(ECCLINE, ("write callback finished\n"));
1096 }
1097
1098
1099 static void
1100 udf_issue_eccline(struct udf_eccline *eccline, int queued_on)
1101 {
1102 struct udf_mount *ump = eccline->ump;
1103 struct strat_private *priv = PRIV(ump);
1104 struct buf *buf, *nestbuf;
1105 uint64_t bit, allbits = ((uint64_t) 1 << ump->packet_size)-1;
1106 uint32_t start;
1107 int sector_size = ump->discinfo.sector_size;
1108 int blks = sector_size / DEV_BSIZE;
1109 int i;
1110
1111 KASSERT(eccline->flags & ECC_LOCKED);
1112
1113 if (queued_on == UDF_SHED_READING) {
1114 DPRINTF(SHEDULE, ("udf_issue_eccline reading : "));
1115 /* read all bits that are not yet present */
1116 eccline->readin = (~eccline->present) & allbits;
1117 KASSERT(eccline->readin);
1118 start = eccline->start_sector;
1119 buf = eccline->buf;
1120 buf->b_flags = B_READ | B_ASYNC;
1121 SET(buf->b_cflags, BC_BUSY); /* mark buffer busy */
1122 buf->b_oflags = 0;
1123 buf->b_iodone = udf_shedule_read_callback;
1124 buf->b_data = eccline->blob;
1125 buf->b_bcount = ump->packet_size * sector_size;
1126 buf->b_resid = buf->b_bcount;
1127 buf->b_bufsize = buf->b_bcount;
1128 buf->b_private = eccline;
1129 BIO_SETPRIO(buf, BPRIO_DEFAULT);
1130 buf->b_lblkno = buf->b_blkno = buf->b_rawblkno = start * blks;
1131 buf->b_proc = NULL;
1132
1133 if (eccline->present != 0) {
1134 for (i = 0; i < ump->packet_size; i++) {
1135 bit = (uint64_t) 1 << i;
1136 if (eccline->present & bit) {
1137 nestiobuf_done(buf, sector_size, 0);
1138 continue;
1139 }
1140 nestbuf = getiobuf(NULL, true);
1141 nestiobuf_setup(buf, nestbuf, i * sector_size,
1142 sector_size);
1143 /* adjust blocknumber to read */
1144 nestbuf->b_blkno = buf->b_blkno + i*blks;
1145 nestbuf->b_rawblkno = buf->b_rawblkno + i*blks;
1146
1147 DPRINTF(SHEDULE, ("sector %d ", start + i));
1148
1149 /* mutex dance since it could lock */
1150 mutex_exit(&priv->discstrat_mutex);
1151 /* call asynchronous */
1152 VOP_STRATEGY(ump->devvp, nestbuf);
1153 mutex_enter(&priv->discstrat_mutex);
1154 }
1155 DPRINTF(SHEDULE, ("\n"));
1156 return;
1157 }
1158 } else {
1159 /* write or seqwrite */
1160 DPRINTF(SHEDULE, ("udf_issue_eccline writing or seqwriting : "));
1161 DPRINTF(SHEDULE, ("\n\tpresent %"PRIx64", readin %"PRIx64", "
1162 "dirty %"PRIx64"\n\t", eccline->present, eccline->readin,
1163 eccline->dirty));
1164 KASSERT(eccline->present == allbits);
1165
1166 start = eccline->start_sector;
1167 buf = eccline->buf;
1168 buf->b_flags = B_WRITE | B_ASYNC;
1169 SET(buf->b_cflags, BC_BUSY); /* mark buffer busy */
1170 buf->b_oflags = 0;
1171 buf->b_iodone = udf_shedule_write_callback;
1172 buf->b_data = eccline->blob;
1173 buf->b_bcount = ump->packet_size * sector_size;
1174 buf->b_resid = buf->b_bcount;
1175 buf->b_bufsize = buf->b_bcount;
1176 buf->b_private = eccline;
1177 BIO_SETPRIO(buf, BPRIO_DEFAULT);
1178 buf->b_lblkno = buf->b_blkno = buf->b_rawblkno = start * blks;
1179 buf->b_proc = NULL;
1180 }
1181
1182 /* mutex dance since it could lock */
1183 mutex_exit(&priv->discstrat_mutex);
1184 /* call asynchronous */
1185 DPRINTF(SHEDULE, ("sector %d for %d\n",
1186 start, ump->packet_size));
1187 VOP_STRATEGY(ump->devvp, buf);
1188 mutex_enter(&priv->discstrat_mutex);
1189 }
1190
1191
1192 static void
1193 udf_discstrat_thread(void *arg)
1194 {
1195 struct udf_mount *ump = (struct udf_mount *) arg;
1196 struct strat_private *priv = PRIV(ump);
1197 struct udf_eccline *eccline;
1198 struct timespec now, *last;
1199 uint64_t allbits = ((uint64_t) 1 << ump->packet_size)-1;
1200 int new_queue, wait, work;
1201
1202 work = 1;
1203 priv->thread_running = 1;
1204 mutex_enter(&priv->discstrat_mutex);
1205 priv->num_floating = 0;
1206 while (priv->run_thread || work || priv->num_floating) {
1207 /* get our time */
1208 vfs_timestamp(&now);
1209
1210 /* maintenance: handle eccline state machine */
1211 for(;;) {
1212 /* only peek at it */
1213 eccline = udf_peek_eccline(priv, UDF_SHED_WAITING);
1214 if (eccline == NULL)
1215 break;
1216
1217 /* if not reading, wait until the time has come */
1218 if ((priv->cur_queue != UDF_SHED_READING) &&
1219 (eccline->wait_time.tv_sec - now.tv_sec > 0)) {
1220 UDF_UNLOCK_ECCLINE(eccline);
1221 /* all others are later, so break off */
1222 break;
1223 }
1224
1225 /* release */
1226 UDF_UNLOCK_ECCLINE(eccline);
1227
1228 /* do get it */
1229 eccline = udf_pop_eccline(priv, UDF_SHED_WAITING);
1230
1231 /* requeue according to state */
1232 new_queue = UDF_SHED_FREE; /* unlikely */
1233 if (eccline->refcnt > 0)
1234 new_queue = UDF_SHED_IDLE;
1235 if (eccline->flags & ECC_WANTED)
1236 new_queue = UDF_SHED_IDLE;
1237 if (eccline->readin)
1238 new_queue = UDF_SHED_READING;
1239 if (eccline->dirty) {
1240 new_queue = UDF_SHED_READING;
1241 if (eccline->present == allbits) {
1242 new_queue = UDF_SHED_WRITING;
1243 if (eccline->flags & ECC_SEQWRITING)
1244 new_queue = UDF_SHED_SEQWRITING;
1245 }
1246 }
1247 udf_push_eccline(eccline, new_queue);
1248 }
1249
1250 /* maintenance: free excess ecclines */
1251 while (priv->num_queued[UDF_SHED_FREE] > UDF_ECCLINE_MAXFREE) {
1252 eccline = udf_pop_eccline(priv, UDF_SHED_FREE);
1253 KASSERT(eccline);
1254 KASSERT(eccline->refcnt == 0);
1255 if (eccline->flags & ECC_WANTED) {
1256 /* we won the race, but we dont want to win */
1257 DPRINTF(ECCLINE, ("Tried removing, pushed back to free list\n"));
1258 udf_push_eccline(eccline, UDF_SHED_IDLE);
1259 } else {
1260 DPRINTF(ECCLINE, ("Removing entry from free list\n"));
1261 udf_dispose_eccline(eccline);
1262 }
1263 }
1264
1265 /* process the current selected queue */
1266 /* get our time */
1267 vfs_timestamp(&now);
1268 last = &priv->last_queued[priv->cur_queue];
1269
1270 /* get our line */
1271 eccline = udf_pop_eccline(priv, priv->cur_queue);
1272 if (eccline) {
1273 wait = 0;
1274 new_queue = priv->cur_queue;
1275 DPRINTF(ECCLINE, ("UDF_ISSUE_ECCLINE\n"));
1276
1277 udf_issue_eccline(eccline, priv->cur_queue);
1278 } else {
1279 /* don't switch too quickly */
1280 if (now.tv_sec - last->tv_sec < 2) {
1281 /* wait some time */
1282 cv_timedwait(&priv->discstrat_cv,
1283 &priv->discstrat_mutex, hz);
1284 /* we assume there is work to be done */
1285 work = 1;
1286 continue;
1287 }
1288
1289 /* XXX select on queue lengths ? */
1290 wait = 1;
1291 /* check if we can/should switch */
1292 new_queue = priv->cur_queue;
1293 if (bufq_peek(priv->queues[UDF_SHED_READING]))
1294 new_queue = UDF_SHED_READING;
1295 if (bufq_peek(priv->queues[UDF_SHED_WRITING]))
1296 new_queue = UDF_SHED_WRITING;
1297 if (bufq_peek(priv->queues[UDF_SHED_SEQWRITING]))
1298 new_queue = UDF_SHED_SEQWRITING;
1299 }
1300
1301 /* give room */
1302 mutex_exit(&priv->discstrat_mutex);
1303
1304 if (new_queue != priv->cur_queue) {
1305 wait = 0;
1306 DPRINTF(SHEDULE, ("switching from %d to %d\n",
1307 priv->cur_queue, new_queue));
1308 priv->cur_queue = new_queue;
1309 }
1310 mutex_enter(&priv->discstrat_mutex);
1311
1312 /* wait for more if needed */
1313 if (wait)
1314 cv_timedwait(&priv->discstrat_cv,
1315 &priv->discstrat_mutex, hz/4); /* /8 */
1316
1317 work = (bufq_peek(priv->queues[UDF_SHED_WAITING]) != NULL);
1318 work |= (bufq_peek(priv->queues[UDF_SHED_READING]) != NULL);
1319 work |= (bufq_peek(priv->queues[UDF_SHED_WRITING]) != NULL);
1320 work |= (bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) != NULL);
1321
1322 DPRINTF(PARANOIA, ("work : (%d, %d, %d) -> work %d, float %d\n",
1323 (bufq_peek(priv->queues[UDF_SHED_READING]) != NULL),
1324 (bufq_peek(priv->queues[UDF_SHED_WRITING]) != NULL),
1325 (bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) != NULL),
1326 work, priv->num_floating));
1327 }
1328
1329 mutex_exit(&priv->discstrat_mutex);
1330
1331 /* tear down remaining ecclines */
1332 mutex_enter(&priv->discstrat_mutex);
1333 KASSERT(bufq_peek(priv->queues[UDF_SHED_WAITING]) == NULL);
1334 KASSERT(bufq_peek(priv->queues[UDF_SHED_IDLE]) == NULL);
1335 KASSERT(bufq_peek(priv->queues[UDF_SHED_READING]) == NULL);
1336 KASSERT(bufq_peek(priv->queues[UDF_SHED_WRITING]) == NULL);
1337 KASSERT(bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) == NULL);
1338
1339 KASSERT(priv->num_queued[UDF_SHED_WAITING] == 0);
1340 KASSERT(priv->num_queued[UDF_SHED_IDLE] == 0);
1341 KASSERT(priv->num_queued[UDF_SHED_READING] == 0);
1342 KASSERT(priv->num_queued[UDF_SHED_WRITING] == 0);
1343 KASSERT(priv->num_queued[UDF_SHED_SEQWRITING] == 0);
1344
1345 eccline = udf_pop_eccline(priv, UDF_SHED_FREE);
1346 while (eccline) {
1347 udf_dispose_eccline(eccline);
1348 eccline = udf_pop_eccline(priv, UDF_SHED_FREE);
1349 }
1350 KASSERT(priv->num_queued[UDF_SHED_FREE] == 0);
1351 mutex_exit(&priv->discstrat_mutex);
1352
1353 priv->thread_running = 0;
1354 priv->thread_finished = 1;
1355 wakeup(&priv->run_thread);
1356 kthread_exit(0);
1357 /* not reached */
1358 }
1359
1360 /* --------------------------------------------------------------------- */
1361
1362 /*
1363 * Buffer memory pool allocator.
1364 */
1365
1366 static void *
1367 ecclinepool_page_alloc(struct pool *pp, int flags)
1368 {
1369 return (void *)uvm_km_alloc(kernel_map,
1370 MAXBSIZE, MAXBSIZE,
1371 ((flags & PR_WAITOK) ? 0 : UVM_KMF_NOWAIT | UVM_KMF_TRYLOCK)
1372 | UVM_KMF_WIRED /* UVM_KMF_PAGABLE? */);
1373 }
1374
1375 static void
1376 ecclinepool_page_free(struct pool *pp, void *v)
1377 {
1378 uvm_km_free(kernel_map, (vaddr_t)v, MAXBSIZE, UVM_KMF_WIRED);
1379 }
1380
1381 static struct pool_allocator ecclinepool_allocator = {
1382 .pa_alloc = ecclinepool_page_alloc,
1383 .pa_free = ecclinepool_page_free,
1384 .pa_pagesz = MAXBSIZE,
1385 };
1386
1387
1388 static void
1389 udf_discstrat_init_rmw(struct udf_strat_args *args)
1390 {
1391 struct udf_mount *ump = args->ump;
1392 struct strat_private *priv = PRIV(ump);
1393 uint32_t lb_size, blobsize, hashline;
1394 int i;
1395
1396 KASSERT(ump);
1397 KASSERT(ump->logical_vol);
1398 KASSERT(priv == NULL);
1399
1400 lb_size = udf_rw32(ump->logical_vol->lb_size);
1401 blobsize = ump->packet_size * lb_size;
1402 KASSERT(lb_size > 0);
1403 KASSERT(ump->packet_size <= 64);
1404
1405 /* initialise our memory space */
1406 ump->strategy_private = malloc(sizeof(struct strat_private),
1407 M_UDFTEMP, M_WAITOK);
1408 priv = ump->strategy_private;
1409 memset(priv, 0 , sizeof(struct strat_private));
1410
1411 /* initialise locks */
1412 cv_init(&priv->discstrat_cv, "udfstrat");
1413 mutex_init(&priv->discstrat_mutex, MUTEX_DEFAULT, IPL_NONE);
1414 mutex_init(&priv->seqwrite_mutex, MUTEX_DEFAULT, IPL_NONE);
1415
1416 /* initialise struct eccline pool */
1417 pool_init(&priv->eccline_pool, sizeof(struct udf_eccline),
1418 0, 0, 0, "udf_eccline_pool", NULL, IPL_NONE);
1419
1420 /* initialise eccline blob pool */
1421 ecclinepool_allocator.pa_pagesz = blobsize;
1422 pool_init(&priv->ecclineblob_pool, blobsize,
1423 0, 0, 0, "udf_eccline_blob", &ecclinepool_allocator, IPL_NONE);
1424
1425 /* initialise main queues */
1426 for (i = 0; i < UDF_SHED_MAX; i++) {
1427 priv->num_queued[i] = 0;
1428 vfs_timestamp(&priv->last_queued[i]);
1429 }
1430 bufq_alloc(&priv->queues[UDF_SHED_WAITING], "fcfs",
1431 BUFQ_SORT_RAWBLOCK);
1432 bufq_alloc(&priv->queues[UDF_SHED_READING], "disksort",
1433 BUFQ_SORT_RAWBLOCK);
1434 bufq_alloc(&priv->queues[UDF_SHED_WRITING], "disksort",
1435 BUFQ_SORT_RAWBLOCK);
1436 bufq_alloc(&priv->queues[UDF_SHED_SEQWRITING], "disksort", 0);
1437
1438 /* initialise administrative queues */
1439 bufq_alloc(&priv->queues[UDF_SHED_IDLE], "fcfs", 0);
1440 bufq_alloc(&priv->queues[UDF_SHED_FREE], "fcfs", 0);
1441
1442 for (hashline = 0; hashline < UDF_ECCBUF_HASHSIZE; hashline++) {
1443 LIST_INIT(&priv->eccline_hash[hashline]);
1444 }
1445
1446 /* create our disk strategy thread */
1447 priv->cur_queue = UDF_SHED_READING;
1448 priv->thread_finished = 0;
1449 priv->thread_running = 0;
1450 priv->run_thread = 1;
1451 if (kthread_create(PRI_NONE, 0 /* KTHREAD_MPSAFE*/, NULL /* cpu_info*/,
1452 udf_discstrat_thread, ump, &priv->queue_lwp,
1453 "%s", "udf_rw")) {
1454 panic("fork udf_rw");
1455 }
1456
1457 /* wait for thread to spin up */
1458 while (!priv->thread_running) {
1459 tsleep(&priv->thread_running, PRIBIO+1, "udfshedstart", hz);
1460 }
1461 }
1462
1463
1464 static void
1465 udf_discstrat_finish_rmw(struct udf_strat_args *args)
1466 {
1467 struct udf_mount *ump = args->ump;
1468 struct strat_private *priv = PRIV(ump);
1469 int error;
1470
1471 if (ump == NULL)
1472 return;
1473
1474 /* stop our sheduling thread */
1475 KASSERT(priv->run_thread == 1);
1476 priv->run_thread = 0;
1477 wakeup(priv->queue_lwp);
1478 while (!priv->thread_finished) {
1479 error = tsleep(&priv->run_thread, PRIBIO+1,
1480 "udfshedfin", hz);
1481 }
1482 /* kthread should be finished now */
1483
1484 /* cleanup our pools */
1485 pool_destroy(&priv->eccline_pool);
1486 pool_destroy(&priv->ecclineblob_pool);
1487
1488 cv_destroy(&priv->discstrat_cv);
1489 mutex_destroy(&priv->discstrat_mutex);
1490 mutex_destroy(&priv->seqwrite_mutex);
1491
1492 /* free our private space */
1493 free(ump->strategy_private, M_UDFTEMP);
1494 ump->strategy_private = NULL;
1495 }
1496
1497 /* --------------------------------------------------------------------- */
1498
1499 struct udf_strategy udf_strat_rmw =
1500 {
1501 udf_create_nodedscr_rmw,
1502 udf_free_nodedscr_rmw,
1503 udf_read_nodedscr_rmw,
1504 udf_write_nodedscr_rmw,
1505 udf_queuebuf_rmw,
1506 udf_discstrat_init_rmw,
1507 udf_discstrat_finish_rmw
1508 };
1509
NetBSD on the FriendlyARM MINI2440