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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
4 | * | |
5 | * May be copied or modified under the terms of the GNU General Public | |
6 | * License. See linux/COPYING for more information. | |
7 | * | |
a676f8d0 PO |
8 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
9 | * DVD-RAM devices. | |
1da177e4 LT |
10 | * |
11 | * Theory of operation: | |
12 | * | |
a676f8d0 PO |
13 | * At the lowest level, there is the standard driver for the CD/DVD device, |
14 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, | |
15 | * but it doesn't know anything about the special restrictions that apply to | |
16 | * packet writing. One restriction is that write requests must be aligned to | |
17 | * packet boundaries on the physical media, and the size of a write request | |
18 | * must be equal to the packet size. Another restriction is that a | |
19 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
20 | * command, if the previous command was a write. | |
21 | * | |
22 | * The purpose of the packet writing driver is to hide these restrictions from | |
23 | * higher layers, such as file systems, and present a block device that can be | |
24 | * randomly read and written using 2kB-sized blocks. | |
25 | * | |
26 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
27 | * Its data is defined by the struct packet_iosched and includes two bio | |
28 | * queues with pending read and write requests. These queues are processed | |
29 | * by the pkt_iosched_process_queue() function. The write requests in this | |
30 | * queue are already properly aligned and sized. This layer is responsible for | |
31 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
32 | * | |
33 | * The next layer transforms unaligned write requests to aligned writes. This | |
34 | * transformation requires reading missing pieces of data from the underlying | |
35 | * block device, assembling the pieces to full packets and queuing them to the | |
36 | * packet I/O scheduler. | |
37 | * | |
38 | * At the top layer there is a custom make_request_fn function that forwards | |
39 | * read requests directly to the iosched queue and puts write requests in the | |
40 | * unaligned write queue. A kernel thread performs the necessary read | |
41 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
42 | * them to the packet I/O scheduler. | |
1da177e4 LT |
43 | * |
44 | *************************************************************************/ | |
45 | ||
1da177e4 LT |
46 | #include <linux/pktcdvd.h> |
47 | #include <linux/config.h> | |
48 | #include <linux/module.h> | |
49 | #include <linux/types.h> | |
50 | #include <linux/kernel.h> | |
51 | #include <linux/kthread.h> | |
52 | #include <linux/errno.h> | |
53 | #include <linux/spinlock.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/proc_fs.h> | |
56 | #include <linux/seq_file.h> | |
57 | #include <linux/miscdevice.h> | |
58 | #include <linux/suspend.h> | |
59 | #include <scsi/scsi_cmnd.h> | |
60 | #include <scsi/scsi_ioctl.h> | |
61 | ||
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #if PACKET_DEBUG | |
65 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
66 | #else | |
67 | #define DPRINTK(fmt, args...) | |
68 | #endif | |
69 | ||
70 | #if PACKET_DEBUG > 1 | |
71 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
72 | #else | |
73 | #define VPRINTK(fmt, args...) | |
74 | #endif | |
75 | ||
76 | #define MAX_SPEED 0xffff | |
77 | ||
78 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) | |
79 | ||
80 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; | |
81 | static struct proc_dir_entry *pkt_proc; | |
82 | static int pkt_major; | |
83 | static struct semaphore ctl_mutex; /* Serialize open/close/setup/teardown */ | |
84 | static mempool_t *psd_pool; | |
85 | ||
86 | ||
87 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
88 | { | |
89 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
90 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
91 | VPRINTK("pktcdvd: queue empty\n"); | |
92 | atomic_set(&pd->iosched.attention, 1); | |
93 | wake_up(&pd->wqueue); | |
94 | } | |
95 | } | |
96 | ||
97 | static void pkt_bio_destructor(struct bio *bio) | |
98 | { | |
99 | kfree(bio->bi_io_vec); | |
100 | kfree(bio); | |
101 | } | |
102 | ||
103 | static struct bio *pkt_bio_alloc(int nr_iovecs) | |
104 | { | |
105 | struct bio_vec *bvl = NULL; | |
106 | struct bio *bio; | |
107 | ||
108 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); | |
109 | if (!bio) | |
110 | goto no_bio; | |
111 | bio_init(bio); | |
112 | ||
1107d2e0 | 113 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
1da177e4 LT |
114 | if (!bvl) |
115 | goto no_bvl; | |
1da177e4 LT |
116 | |
117 | bio->bi_max_vecs = nr_iovecs; | |
118 | bio->bi_io_vec = bvl; | |
119 | bio->bi_destructor = pkt_bio_destructor; | |
120 | ||
121 | return bio; | |
122 | ||
123 | no_bvl: | |
124 | kfree(bio); | |
125 | no_bio: | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Allocate a packet_data struct | |
131 | */ | |
132 | static struct packet_data *pkt_alloc_packet_data(void) | |
133 | { | |
134 | int i; | |
135 | struct packet_data *pkt; | |
136 | ||
1107d2e0 | 137 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
138 | if (!pkt) |
139 | goto no_pkt; | |
1da177e4 LT |
140 | |
141 | pkt->w_bio = pkt_bio_alloc(PACKET_MAX_SIZE); | |
142 | if (!pkt->w_bio) | |
143 | goto no_bio; | |
144 | ||
145 | for (i = 0; i < PAGES_PER_PACKET; i++) { | |
146 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); | |
147 | if (!pkt->pages[i]) | |
148 | goto no_page; | |
149 | } | |
150 | ||
151 | spin_lock_init(&pkt->lock); | |
152 | ||
153 | for (i = 0; i < PACKET_MAX_SIZE; i++) { | |
154 | struct bio *bio = pkt_bio_alloc(1); | |
155 | if (!bio) | |
156 | goto no_rd_bio; | |
157 | pkt->r_bios[i] = bio; | |
158 | } | |
159 | ||
160 | return pkt; | |
161 | ||
162 | no_rd_bio: | |
163 | for (i = 0; i < PACKET_MAX_SIZE; i++) { | |
164 | struct bio *bio = pkt->r_bios[i]; | |
165 | if (bio) | |
166 | bio_put(bio); | |
167 | } | |
168 | ||
169 | no_page: | |
170 | for (i = 0; i < PAGES_PER_PACKET; i++) | |
171 | if (pkt->pages[i]) | |
172 | __free_page(pkt->pages[i]); | |
173 | bio_put(pkt->w_bio); | |
174 | no_bio: | |
175 | kfree(pkt); | |
176 | no_pkt: | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Free a packet_data struct | |
182 | */ | |
183 | static void pkt_free_packet_data(struct packet_data *pkt) | |
184 | { | |
185 | int i; | |
186 | ||
187 | for (i = 0; i < PACKET_MAX_SIZE; i++) { | |
188 | struct bio *bio = pkt->r_bios[i]; | |
189 | if (bio) | |
190 | bio_put(bio); | |
191 | } | |
192 | for (i = 0; i < PAGES_PER_PACKET; i++) | |
193 | __free_page(pkt->pages[i]); | |
194 | bio_put(pkt->w_bio); | |
195 | kfree(pkt); | |
196 | } | |
197 | ||
198 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
199 | { | |
200 | struct packet_data *pkt, *next; | |
201 | ||
202 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
203 | ||
204 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
205 | pkt_free_packet_data(pkt); | |
206 | } | |
207 | } | |
208 | ||
209 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
210 | { | |
211 | struct packet_data *pkt; | |
212 | ||
213 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); | |
214 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
215 | spin_lock_init(&pd->cdrw.active_list_lock); | |
216 | while (nr_packets > 0) { | |
217 | pkt = pkt_alloc_packet_data(); | |
218 | if (!pkt) { | |
219 | pkt_shrink_pktlist(pd); | |
220 | return 0; | |
221 | } | |
222 | pkt->id = nr_packets; | |
223 | pkt->pd = pd; | |
224 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
225 | nr_packets--; | |
226 | } | |
227 | return 1; | |
228 | } | |
229 | ||
dd0fc66f | 230 | static void *pkt_rb_alloc(gfp_t gfp_mask, void *data) |
1da177e4 LT |
231 | { |
232 | return kmalloc(sizeof(struct pkt_rb_node), gfp_mask); | |
233 | } | |
234 | ||
235 | static void pkt_rb_free(void *ptr, void *data) | |
236 | { | |
237 | kfree(ptr); | |
238 | } | |
239 | ||
240 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) | |
241 | { | |
242 | struct rb_node *n = rb_next(&node->rb_node); | |
243 | if (!n) | |
244 | return NULL; | |
245 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
246 | } | |
247 | ||
ac893963 | 248 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
249 | { |
250 | rb_erase(&node->rb_node, &pd->bio_queue); | |
251 | mempool_free(node, pd->rb_pool); | |
252 | pd->bio_queue_size--; | |
253 | BUG_ON(pd->bio_queue_size < 0); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
258 | */ | |
259 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
260 | { | |
261 | struct rb_node *n = pd->bio_queue.rb_node; | |
262 | struct rb_node *next; | |
263 | struct pkt_rb_node *tmp; | |
264 | ||
265 | if (!n) { | |
266 | BUG_ON(pd->bio_queue_size > 0); | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | for (;;) { | |
271 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
272 | if (s <= tmp->bio->bi_sector) | |
273 | next = n->rb_left; | |
274 | else | |
275 | next = n->rb_right; | |
276 | if (!next) | |
277 | break; | |
278 | n = next; | |
279 | } | |
280 | ||
281 | if (s > tmp->bio->bi_sector) { | |
282 | tmp = pkt_rbtree_next(tmp); | |
283 | if (!tmp) | |
284 | return NULL; | |
285 | } | |
286 | BUG_ON(s > tmp->bio->bi_sector); | |
287 | return tmp; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Insert a node into the pd->bio_queue rb tree. | |
292 | */ | |
293 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
294 | { | |
295 | struct rb_node **p = &pd->bio_queue.rb_node; | |
296 | struct rb_node *parent = NULL; | |
297 | sector_t s = node->bio->bi_sector; | |
298 | struct pkt_rb_node *tmp; | |
299 | ||
300 | while (*p) { | |
301 | parent = *p; | |
302 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
303 | if (s < tmp->bio->bi_sector) | |
304 | p = &(*p)->rb_left; | |
305 | else | |
306 | p = &(*p)->rb_right; | |
307 | } | |
308 | rb_link_node(&node->rb_node, parent, p); | |
309 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
310 | pd->bio_queue_size++; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Add a bio to a single linked list defined by its head and tail pointers. | |
315 | */ | |
ac893963 | 316 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
1da177e4 LT |
317 | { |
318 | bio->bi_next = NULL; | |
319 | if (*list_tail) { | |
320 | BUG_ON((*list_head) == NULL); | |
321 | (*list_tail)->bi_next = bio; | |
322 | (*list_tail) = bio; | |
323 | } else { | |
324 | BUG_ON((*list_head) != NULL); | |
325 | (*list_head) = bio; | |
326 | (*list_tail) = bio; | |
327 | } | |
328 | } | |
329 | ||
330 | /* | |
331 | * Remove and return the first bio from a single linked list defined by its | |
332 | * head and tail pointers. | |
333 | */ | |
334 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) | |
335 | { | |
336 | struct bio *bio; | |
337 | ||
338 | if (*list_head == NULL) | |
339 | return NULL; | |
340 | ||
341 | bio = *list_head; | |
342 | *list_head = bio->bi_next; | |
343 | if (*list_head == NULL) | |
344 | *list_tail = NULL; | |
345 | ||
346 | bio->bi_next = NULL; | |
347 | return bio; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Send a packet_command to the underlying block device and | |
352 | * wait for completion. | |
353 | */ | |
354 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
355 | { | |
356 | char sense[SCSI_SENSE_BUFFERSIZE]; | |
357 | request_queue_t *q; | |
358 | struct request *rq; | |
359 | DECLARE_COMPLETION(wait); | |
360 | int err = 0; | |
361 | ||
362 | q = bdev_get_queue(pd->bdev); | |
363 | ||
364 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ, | |
365 | __GFP_WAIT); | |
366 | rq->errors = 0; | |
367 | rq->rq_disk = pd->bdev->bd_disk; | |
368 | rq->bio = NULL; | |
369 | rq->buffer = NULL; | |
370 | rq->timeout = 60*HZ; | |
371 | rq->data = cgc->buffer; | |
372 | rq->data_len = cgc->buflen; | |
373 | rq->sense = sense; | |
374 | memset(sense, 0, sizeof(sense)); | |
375 | rq->sense_len = 0; | |
376 | rq->flags |= REQ_BLOCK_PC | REQ_HARDBARRIER; | |
377 | if (cgc->quiet) | |
378 | rq->flags |= REQ_QUIET; | |
379 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); | |
380 | if (sizeof(rq->cmd) > CDROM_PACKET_SIZE) | |
381 | memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE); | |
382 | ||
383 | rq->ref_count++; | |
384 | rq->flags |= REQ_NOMERGE; | |
385 | rq->waiting = &wait; | |
386 | rq->end_io = blk_end_sync_rq; | |
387 | elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1); | |
388 | generic_unplug_device(q); | |
389 | wait_for_completion(&wait); | |
390 | ||
391 | if (rq->errors) | |
392 | err = -EIO; | |
393 | ||
394 | blk_put_request(rq); | |
395 | return err; | |
396 | } | |
397 | ||
398 | /* | |
399 | * A generic sense dump / resolve mechanism should be implemented across | |
400 | * all ATAPI + SCSI devices. | |
401 | */ | |
402 | static void pkt_dump_sense(struct packet_command *cgc) | |
403 | { | |
404 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
405 | "Medium error", "Hardware error", "Illegal request", | |
406 | "Unit attention", "Data protect", "Blank check" }; | |
407 | int i; | |
408 | struct request_sense *sense = cgc->sense; | |
409 | ||
410 | printk("pktcdvd:"); | |
411 | for (i = 0; i < CDROM_PACKET_SIZE; i++) | |
412 | printk(" %02x", cgc->cmd[i]); | |
413 | printk(" - "); | |
414 | ||
415 | if (sense == NULL) { | |
416 | printk("no sense\n"); | |
417 | return; | |
418 | } | |
419 | ||
420 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
421 | ||
422 | if (sense->sense_key > 8) { | |
423 | printk(" (INVALID)\n"); | |
424 | return; | |
425 | } | |
426 | ||
427 | printk(" (%s)\n", info[sense->sense_key]); | |
428 | } | |
429 | ||
430 | /* | |
431 | * flush the drive cache to media | |
432 | */ | |
433 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
434 | { | |
435 | struct packet_command cgc; | |
436 | ||
437 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
438 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
439 | cgc.quiet = 1; | |
440 | ||
441 | /* | |
442 | * the IMMED bit -- we default to not setting it, although that | |
443 | * would allow a much faster close, this is safer | |
444 | */ | |
445 | #if 0 | |
446 | cgc.cmd[1] = 1 << 1; | |
447 | #endif | |
448 | return pkt_generic_packet(pd, &cgc); | |
449 | } | |
450 | ||
451 | /* | |
452 | * speed is given as the normal factor, e.g. 4 for 4x | |
453 | */ | |
454 | static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed) | |
455 | { | |
456 | struct packet_command cgc; | |
457 | struct request_sense sense; | |
458 | int ret; | |
459 | ||
460 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
461 | cgc.sense = &sense; | |
462 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
463 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
464 | cgc.cmd[3] = read_speed & 0xff; | |
465 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
466 | cgc.cmd[5] = write_speed & 0xff; | |
467 | ||
468 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
469 | pkt_dump_sense(&cgc); | |
470 | ||
471 | return ret; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Queue a bio for processing by the low-level CD device. Must be called | |
476 | * from process context. | |
477 | */ | |
46c271be | 478 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
479 | { |
480 | spin_lock(&pd->iosched.lock); | |
481 | if (bio_data_dir(bio) == READ) { | |
482 | pkt_add_list_last(bio, &pd->iosched.read_queue, | |
483 | &pd->iosched.read_queue_tail); | |
1da177e4 LT |
484 | } else { |
485 | pkt_add_list_last(bio, &pd->iosched.write_queue, | |
486 | &pd->iosched.write_queue_tail); | |
487 | } | |
488 | spin_unlock(&pd->iosched.lock); | |
489 | ||
490 | atomic_set(&pd->iosched.attention, 1); | |
491 | wake_up(&pd->wqueue); | |
492 | } | |
493 | ||
494 | /* | |
495 | * Process the queued read/write requests. This function handles special | |
496 | * requirements for CDRW drives: | |
497 | * - A cache flush command must be inserted before a read request if the | |
498 | * previous request was a write. | |
46c271be | 499 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 500 | * than necessary. |
46c271be PO |
501 | * - Optimize for throughput at the expense of latency. This means that streaming |
502 | * writes will never be interrupted by a read, but if the drive has to seek | |
503 | * before the next write, switch to reading instead if there are any pending | |
504 | * read requests. | |
1da177e4 LT |
505 | * - Set the read speed according to current usage pattern. When only reading |
506 | * from the device, it's best to use the highest possible read speed, but | |
507 | * when switching often between reading and writing, it's better to have the | |
508 | * same read and write speeds. | |
1da177e4 LT |
509 | */ |
510 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
511 | { | |
1da177e4 LT |
512 | |
513 | if (atomic_read(&pd->iosched.attention) == 0) | |
514 | return; | |
515 | atomic_set(&pd->iosched.attention, 0); | |
516 | ||
1da177e4 LT |
517 | for (;;) { |
518 | struct bio *bio; | |
46c271be | 519 | int reads_queued, writes_queued; |
1da177e4 LT |
520 | |
521 | spin_lock(&pd->iosched.lock); | |
522 | reads_queued = (pd->iosched.read_queue != NULL); | |
523 | writes_queued = (pd->iosched.write_queue != NULL); | |
1da177e4 LT |
524 | spin_unlock(&pd->iosched.lock); |
525 | ||
526 | if (!reads_queued && !writes_queued) | |
527 | break; | |
528 | ||
529 | if (pd->iosched.writing) { | |
46c271be PO |
530 | int need_write_seek = 1; |
531 | spin_lock(&pd->iosched.lock); | |
532 | bio = pd->iosched.write_queue; | |
533 | spin_unlock(&pd->iosched.lock); | |
534 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
535 | need_write_seek = 0; | |
536 | if (need_write_seek && reads_queued) { | |
1da177e4 LT |
537 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
538 | VPRINTK("pktcdvd: write, waiting\n"); | |
539 | break; | |
540 | } | |
541 | pkt_flush_cache(pd); | |
542 | pd->iosched.writing = 0; | |
543 | } | |
544 | } else { | |
545 | if (!reads_queued && writes_queued) { | |
546 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
547 | VPRINTK("pktcdvd: read, waiting\n"); | |
548 | break; | |
549 | } | |
550 | pd->iosched.writing = 1; | |
551 | } | |
552 | } | |
553 | ||
554 | spin_lock(&pd->iosched.lock); | |
555 | if (pd->iosched.writing) { | |
556 | bio = pkt_get_list_first(&pd->iosched.write_queue, | |
557 | &pd->iosched.write_queue_tail); | |
558 | } else { | |
559 | bio = pkt_get_list_first(&pd->iosched.read_queue, | |
560 | &pd->iosched.read_queue_tail); | |
561 | } | |
562 | spin_unlock(&pd->iosched.lock); | |
563 | ||
564 | if (!bio) | |
565 | continue; | |
566 | ||
567 | if (bio_data_dir(bio) == READ) | |
568 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 569 | else { |
1da177e4 | 570 | pd->iosched.successive_reads = 0; |
46c271be PO |
571 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
572 | } | |
1da177e4 LT |
573 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
574 | if (pd->read_speed == pd->write_speed) { | |
575 | pd->read_speed = MAX_SPEED; | |
576 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
577 | } | |
578 | } else { | |
579 | if (pd->read_speed != pd->write_speed) { | |
580 | pd->read_speed = pd->write_speed; | |
581 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
582 | } | |
583 | } | |
584 | ||
585 | atomic_inc(&pd->cdrw.pending_bios); | |
586 | generic_make_request(bio); | |
587 | } | |
588 | } | |
589 | ||
590 | /* | |
591 | * Special care is needed if the underlying block device has a small | |
592 | * max_phys_segments value. | |
593 | */ | |
594 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q) | |
595 | { | |
596 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { | |
597 | /* | |
598 | * The cdrom device can handle one segment/frame | |
599 | */ | |
600 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
601 | return 0; | |
602 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { | |
603 | /* | |
604 | * We can handle this case at the expense of some extra memory | |
605 | * copies during write operations | |
606 | */ | |
607 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
608 | return 0; | |
609 | } else { | |
610 | printk("pktcdvd: cdrom max_phys_segments too small\n"); | |
611 | return -EIO; | |
612 | } | |
613 | } | |
614 | ||
615 | /* | |
616 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
617 | */ | |
618 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
619 | { | |
620 | unsigned int copy_size = CD_FRAMESIZE; | |
621 | ||
622 | while (copy_size > 0) { | |
623 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
624 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
625 | src_bvl->bv_offset + offs; | |
626 | void *vto = page_address(dst_page) + dst_offs; | |
627 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
628 | ||
629 | BUG_ON(len < 0); | |
630 | memcpy(vto, vfrom, len); | |
631 | kunmap_atomic(vfrom, KM_USER0); | |
632 | ||
633 | seg++; | |
634 | offs = 0; | |
635 | dst_offs += len; | |
636 | copy_size -= len; | |
637 | } | |
638 | } | |
639 | ||
640 | /* | |
641 | * Copy all data for this packet to pkt->pages[], so that | |
642 | * a) The number of required segments for the write bio is minimized, which | |
643 | * is necessary for some scsi controllers. | |
644 | * b) The data can be used as cache to avoid read requests if we receive a | |
645 | * new write request for the same zone. | |
646 | */ | |
647 | static void pkt_make_local_copy(struct packet_data *pkt, struct page **pages, int *offsets) | |
648 | { | |
649 | int f, p, offs; | |
650 | ||
651 | /* Copy all data to pkt->pages[] */ | |
652 | p = 0; | |
653 | offs = 0; | |
654 | for (f = 0; f < pkt->frames; f++) { | |
655 | if (pages[f] != pkt->pages[p]) { | |
656 | void *vfrom = kmap_atomic(pages[f], KM_USER0) + offsets[f]; | |
657 | void *vto = page_address(pkt->pages[p]) + offs; | |
658 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
659 | kunmap_atomic(vfrom, KM_USER0); | |
660 | pages[f] = pkt->pages[p]; | |
661 | offsets[f] = offs; | |
662 | } else { | |
663 | BUG_ON(offsets[f] != offs); | |
664 | } | |
665 | offs += CD_FRAMESIZE; | |
666 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
667 | offs = 0; |
668 | p++; | |
669 | } | |
670 | } | |
671 | } | |
672 | ||
673 | static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err) | |
674 | { | |
675 | struct packet_data *pkt = bio->bi_private; | |
676 | struct pktcdvd_device *pd = pkt->pd; | |
677 | BUG_ON(!pd); | |
678 | ||
679 | if (bio->bi_size) | |
680 | return 1; | |
681 | ||
682 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, | |
683 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
684 | ||
685 | if (err) | |
686 | atomic_inc(&pkt->io_errors); | |
687 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
688 | atomic_inc(&pkt->run_sm); | |
689 | wake_up(&pd->wqueue); | |
690 | } | |
691 | pkt_bio_finished(pd); | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err) | |
697 | { | |
698 | struct packet_data *pkt = bio->bi_private; | |
699 | struct pktcdvd_device *pd = pkt->pd; | |
700 | BUG_ON(!pd); | |
701 | ||
702 | if (bio->bi_size) | |
703 | return 1; | |
704 | ||
705 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); | |
706 | ||
707 | pd->stats.pkt_ended++; | |
708 | ||
709 | pkt_bio_finished(pd); | |
710 | atomic_dec(&pkt->io_wait); | |
711 | atomic_inc(&pkt->run_sm); | |
712 | wake_up(&pd->wqueue); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Schedule reads for the holes in a packet | |
718 | */ | |
719 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
720 | { | |
721 | int frames_read = 0; | |
722 | struct bio *bio; | |
723 | int f; | |
724 | char written[PACKET_MAX_SIZE]; | |
725 | ||
726 | BUG_ON(!pkt->orig_bios); | |
727 | ||
728 | atomic_set(&pkt->io_wait, 0); | |
729 | atomic_set(&pkt->io_errors, 0); | |
730 | ||
1da177e4 LT |
731 | /* |
732 | * Figure out which frames we need to read before we can write. | |
733 | */ | |
734 | memset(written, 0, sizeof(written)); | |
735 | spin_lock(&pkt->lock); | |
736 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
737 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
738 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 739 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
740 | BUG_ON(first_frame < 0); |
741 | BUG_ON(first_frame + num_frames > pkt->frames); | |
742 | for (f = first_frame; f < first_frame + num_frames; f++) | |
743 | written[f] = 1; | |
744 | } | |
745 | spin_unlock(&pkt->lock); | |
746 | ||
06e7ab53 PO |
747 | if (pkt->cache_valid) { |
748 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
749 | (unsigned long long)pkt->sector); | |
750 | goto out_account; | |
751 | } | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Schedule reads for missing parts of the packet. | |
755 | */ | |
756 | for (f = 0; f < pkt->frames; f++) { | |
757 | int p, offset; | |
758 | if (written[f]) | |
759 | continue; | |
760 | bio = pkt->r_bios[f]; | |
761 | bio_init(bio); | |
762 | bio->bi_max_vecs = 1; | |
763 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
764 | bio->bi_bdev = pd->bdev; | |
765 | bio->bi_end_io = pkt_end_io_read; | |
766 | bio->bi_private = pkt; | |
767 | ||
768 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
769 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
770 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
771 | f, pkt->pages[p], offset); | |
772 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
773 | BUG(); | |
774 | ||
775 | atomic_inc(&pkt->io_wait); | |
776 | bio->bi_rw = READ; | |
46c271be | 777 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
778 | frames_read++; |
779 | } | |
780 | ||
781 | out_account: | |
782 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
783 | frames_read, (unsigned long long)pkt->sector); | |
784 | pd->stats.pkt_started++; | |
785 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
786 | } |
787 | ||
788 | /* | |
789 | * Find a packet matching zone, or the least recently used packet if | |
790 | * there is no match. | |
791 | */ | |
792 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
793 | { | |
794 | struct packet_data *pkt; | |
795 | ||
796 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
797 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
798 | list_del_init(&pkt->list); | |
799 | if (pkt->sector != zone) | |
800 | pkt->cache_valid = 0; | |
610827de | 801 | return pkt; |
1da177e4 LT |
802 | } |
803 | } | |
610827de PO |
804 | BUG(); |
805 | return NULL; | |
1da177e4 LT |
806 | } |
807 | ||
808 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
809 | { | |
810 | if (pkt->cache_valid) { | |
811 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
812 | } else { | |
813 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
814 | } | |
815 | } | |
816 | ||
817 | /* | |
818 | * recover a failed write, query for relocation if possible | |
819 | * | |
820 | * returns 1 if recovery is possible, or 0 if not | |
821 | * | |
822 | */ | |
823 | static int pkt_start_recovery(struct packet_data *pkt) | |
824 | { | |
825 | /* | |
826 | * FIXME. We need help from the file system to implement | |
827 | * recovery handling. | |
828 | */ | |
829 | return 0; | |
830 | #if 0 | |
831 | struct request *rq = pkt->rq; | |
832 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
833 | struct block_device *pkt_bdev; | |
834 | struct super_block *sb = NULL; | |
835 | unsigned long old_block, new_block; | |
836 | sector_t new_sector; | |
837 | ||
838 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
839 | if (pkt_bdev) { | |
840 | sb = get_super(pkt_bdev); | |
841 | bdput(pkt_bdev); | |
842 | } | |
843 | ||
844 | if (!sb) | |
845 | return 0; | |
846 | ||
847 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
848 | goto out; | |
849 | ||
850 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
851 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
852 | goto out; | |
853 | ||
854 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
855 | pkt->sector = new_sector; | |
856 | ||
857 | pkt->bio->bi_sector = new_sector; | |
858 | pkt->bio->bi_next = NULL; | |
859 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
860 | pkt->bio->bi_idx = 0; | |
861 | ||
862 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); | |
863 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); | |
864 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
865 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
866 | BUG_ON(pkt->bio->bi_private != pkt); | |
867 | ||
868 | drop_super(sb); | |
869 | return 1; | |
870 | ||
871 | out: | |
872 | drop_super(sb); | |
873 | return 0; | |
874 | #endif | |
875 | } | |
876 | ||
877 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
878 | { | |
879 | #if PACKET_DEBUG > 1 | |
880 | static const char *state_name[] = { | |
881 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
882 | }; | |
883 | enum packet_data_state old_state = pkt->state; | |
884 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
885 | state_name[old_state], state_name[state]); | |
886 | #endif | |
887 | pkt->state = state; | |
888 | } | |
889 | ||
890 | /* | |
891 | * Scan the work queue to see if we can start a new packet. | |
892 | * returns non-zero if any work was done. | |
893 | */ | |
894 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
895 | { | |
896 | struct packet_data *pkt, *p; | |
897 | struct bio *bio = NULL; | |
898 | sector_t zone = 0; /* Suppress gcc warning */ | |
899 | struct pkt_rb_node *node, *first_node; | |
900 | struct rb_node *n; | |
901 | ||
902 | VPRINTK("handle_queue\n"); | |
903 | ||
904 | atomic_set(&pd->scan_queue, 0); | |
905 | ||
906 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
907 | VPRINTK("handle_queue: no pkt\n"); | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Try to find a zone we are not already working on. | |
913 | */ | |
914 | spin_lock(&pd->lock); | |
915 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
916 | if (!first_node) { | |
917 | n = rb_first(&pd->bio_queue); | |
918 | if (n) | |
919 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
920 | } | |
921 | node = first_node; | |
922 | while (node) { | |
923 | bio = node->bio; | |
924 | zone = ZONE(bio->bi_sector, pd); | |
925 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
7baeb6a5 PO |
926 | if (p->sector == zone) { |
927 | bio = NULL; | |
1da177e4 | 928 | goto try_next_bio; |
7baeb6a5 | 929 | } |
1da177e4 LT |
930 | } |
931 | break; | |
932 | try_next_bio: | |
933 | node = pkt_rbtree_next(node); | |
934 | if (!node) { | |
935 | n = rb_first(&pd->bio_queue); | |
936 | if (n) | |
937 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
938 | } | |
939 | if (node == first_node) | |
940 | node = NULL; | |
941 | } | |
942 | spin_unlock(&pd->lock); | |
943 | if (!bio) { | |
944 | VPRINTK("handle_queue: no bio\n"); | |
945 | return 0; | |
946 | } | |
947 | ||
948 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
949 | |
950 | pd->current_sector = zone + pd->settings.size; | |
951 | pkt->sector = zone; | |
952 | pkt->frames = pd->settings.size >> 2; | |
1da177e4 LT |
953 | pkt->write_size = 0; |
954 | ||
955 | /* | |
956 | * Scan work queue for bios in the same zone and link them | |
957 | * to this packet. | |
958 | */ | |
959 | spin_lock(&pd->lock); | |
960 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
961 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
962 | bio = node->bio; | |
963 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
964 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
965 | if (ZONE(bio->bi_sector, pd) != zone) | |
966 | break; | |
967 | pkt_rbtree_erase(pd, node); | |
968 | spin_lock(&pkt->lock); | |
969 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); | |
970 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
971 | spin_unlock(&pkt->lock); | |
972 | } | |
973 | spin_unlock(&pd->lock); | |
974 | ||
975 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
976 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
977 | atomic_set(&pkt->run_sm, 1); | |
978 | ||
979 | spin_lock(&pd->cdrw.active_list_lock); | |
980 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
981 | spin_unlock(&pd->cdrw.active_list_lock); | |
982 | ||
983 | return 1; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Assemble a bio to write one packet and queue the bio for processing | |
988 | * by the underlying block device. | |
989 | */ | |
990 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
991 | { | |
992 | struct bio *bio; | |
993 | struct page *pages[PACKET_MAX_SIZE]; | |
994 | int offsets[PACKET_MAX_SIZE]; | |
995 | int f; | |
996 | int frames_write; | |
997 | ||
998 | for (f = 0; f < pkt->frames; f++) { | |
999 | pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; | |
1000 | offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Fill-in pages[] and offsets[] with data from orig_bios. | |
1005 | */ | |
1006 | frames_write = 0; | |
1007 | spin_lock(&pkt->lock); | |
1008 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1009 | int segment = bio->bi_idx; | |
1010 | int src_offs = 0; | |
1011 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1012 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1013 | BUG_ON(first_frame < 0); | |
1014 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1015 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1016 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1017 | ||
1018 | while (src_offs >= src_bvl->bv_len) { | |
1019 | src_offs -= src_bvl->bv_len; | |
1020 | segment++; | |
1021 | BUG_ON(segment >= bio->bi_vcnt); | |
1022 | src_bvl = bio_iovec_idx(bio, segment); | |
1023 | } | |
1024 | ||
1025 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
1026 | pages[f] = src_bvl->bv_page; | |
1027 | offsets[f] = src_bvl->bv_offset + src_offs; | |
1028 | } else { | |
1029 | pkt_copy_bio_data(bio, segment, src_offs, | |
1030 | pages[f], offsets[f]); | |
1031 | } | |
1032 | src_offs += CD_FRAMESIZE; | |
1033 | frames_write++; | |
1034 | } | |
1035 | } | |
1036 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1037 | spin_unlock(&pkt->lock); | |
1038 | ||
1039 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1040 | frames_write, (unsigned long long)pkt->sector); | |
1041 | BUG_ON(frames_write != pkt->write_size); | |
1042 | ||
1043 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
1044 | pkt_make_local_copy(pkt, pages, offsets); | |
1045 | pkt->cache_valid = 1; | |
1046 | } else { | |
1047 | pkt->cache_valid = 0; | |
1048 | } | |
1049 | ||
1050 | /* Start the write request */ | |
1051 | bio_init(pkt->w_bio); | |
1052 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1053 | pkt->w_bio->bi_sector = pkt->sector; | |
1054 | pkt->w_bio->bi_bdev = pd->bdev; | |
1055 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1056 | pkt->w_bio->bi_private = pkt; | |
1057 | for (f = 0; f < pkt->frames; f++) { | |
1058 | if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) && | |
1059 | (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) { | |
1060 | if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f])) | |
1061 | BUG(); | |
1062 | f++; | |
1063 | } else { | |
1064 | if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f])) | |
1065 | BUG(); | |
1066 | } | |
1067 | } | |
1068 | VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt); | |
1069 | ||
1070 | atomic_set(&pkt->io_wait, 1); | |
1071 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1072 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1076 | { | |
1077 | struct bio *bio, *next; | |
1078 | ||
1079 | if (!uptodate) | |
1080 | pkt->cache_valid = 0; | |
1081 | ||
1082 | /* Finish all bios corresponding to this packet */ | |
1083 | bio = pkt->orig_bios; | |
1084 | while (bio) { | |
1085 | next = bio->bi_next; | |
1086 | bio->bi_next = NULL; | |
1087 | bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO); | |
1088 | bio = next; | |
1089 | } | |
1090 | pkt->orig_bios = pkt->orig_bios_tail = NULL; | |
1091 | } | |
1092 | ||
1093 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1094 | { | |
1095 | int uptodate; | |
1096 | ||
1097 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1098 | ||
1099 | for (;;) { | |
1100 | switch (pkt->state) { | |
1101 | case PACKET_WAITING_STATE: | |
1102 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1103 | return; | |
1104 | ||
1105 | pkt->sleep_time = 0; | |
1106 | pkt_gather_data(pd, pkt); | |
1107 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1108 | break; | |
1109 | ||
1110 | case PACKET_READ_WAIT_STATE: | |
1111 | if (atomic_read(&pkt->io_wait) > 0) | |
1112 | return; | |
1113 | ||
1114 | if (atomic_read(&pkt->io_errors) > 0) { | |
1115 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1116 | } else { | |
1117 | pkt_start_write(pd, pkt); | |
1118 | } | |
1119 | break; | |
1120 | ||
1121 | case PACKET_WRITE_WAIT_STATE: | |
1122 | if (atomic_read(&pkt->io_wait) > 0) | |
1123 | return; | |
1124 | ||
1125 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1126 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1127 | } else { | |
1128 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1129 | } | |
1130 | break; | |
1131 | ||
1132 | case PACKET_RECOVERY_STATE: | |
1133 | if (pkt_start_recovery(pkt)) { | |
1134 | pkt_start_write(pd, pkt); | |
1135 | } else { | |
1136 | VPRINTK("No recovery possible\n"); | |
1137 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1138 | } | |
1139 | break; | |
1140 | ||
1141 | case PACKET_FINISHED_STATE: | |
1142 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1143 | pkt_finish_packet(pkt, uptodate); | |
1144 | return; | |
1145 | ||
1146 | default: | |
1147 | BUG(); | |
1148 | break; | |
1149 | } | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1154 | { | |
1155 | struct packet_data *pkt, *next; | |
1156 | ||
1157 | VPRINTK("pkt_handle_packets\n"); | |
1158 | ||
1159 | /* | |
1160 | * Run state machine for active packets | |
1161 | */ | |
1162 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1163 | if (atomic_read(&pkt->run_sm) > 0) { | |
1164 | atomic_set(&pkt->run_sm, 0); | |
1165 | pkt_run_state_machine(pd, pkt); | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Move no longer active packets to the free list | |
1171 | */ | |
1172 | spin_lock(&pd->cdrw.active_list_lock); | |
1173 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1174 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1175 | list_del(&pkt->list); | |
1176 | pkt_put_packet_data(pd, pkt); | |
1177 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1178 | atomic_set(&pd->scan_queue, 1); | |
1179 | } | |
1180 | } | |
1181 | spin_unlock(&pd->cdrw.active_list_lock); | |
1182 | } | |
1183 | ||
1184 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1185 | { | |
1186 | struct packet_data *pkt; | |
1187 | int i; | |
1188 | ||
ae7642bb | 1189 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1190 | states[i] = 0; |
1191 | ||
1192 | spin_lock(&pd->cdrw.active_list_lock); | |
1193 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1194 | states[pkt->state]++; | |
1195 | } | |
1196 | spin_unlock(&pd->cdrw.active_list_lock); | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * kcdrwd is woken up when writes have been queued for one of our | |
1201 | * registered devices | |
1202 | */ | |
1203 | static int kcdrwd(void *foobar) | |
1204 | { | |
1205 | struct pktcdvd_device *pd = foobar; | |
1206 | struct packet_data *pkt; | |
1207 | long min_sleep_time, residue; | |
1208 | ||
1209 | set_user_nice(current, -20); | |
1210 | ||
1211 | for (;;) { | |
1212 | DECLARE_WAITQUEUE(wait, current); | |
1213 | ||
1214 | /* | |
1215 | * Wait until there is something to do | |
1216 | */ | |
1217 | add_wait_queue(&pd->wqueue, &wait); | |
1218 | for (;;) { | |
1219 | set_current_state(TASK_INTERRUPTIBLE); | |
1220 | ||
1221 | /* Check if we need to run pkt_handle_queue */ | |
1222 | if (atomic_read(&pd->scan_queue) > 0) | |
1223 | goto work_to_do; | |
1224 | ||
1225 | /* Check if we need to run the state machine for some packet */ | |
1226 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1227 | if (atomic_read(&pkt->run_sm) > 0) | |
1228 | goto work_to_do; | |
1229 | } | |
1230 | ||
1231 | /* Check if we need to process the iosched queues */ | |
1232 | if (atomic_read(&pd->iosched.attention) != 0) | |
1233 | goto work_to_do; | |
1234 | ||
1235 | /* Otherwise, go to sleep */ | |
1236 | if (PACKET_DEBUG > 1) { | |
1237 | int states[PACKET_NUM_STATES]; | |
1238 | pkt_count_states(pd, states); | |
1239 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1240 | states[0], states[1], states[2], states[3], | |
1241 | states[4], states[5]); | |
1242 | } | |
1243 | ||
1244 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1245 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1246 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1247 | min_sleep_time = pkt->sleep_time; | |
1248 | } | |
1249 | ||
1250 | generic_unplug_device(bdev_get_queue(pd->bdev)); | |
1251 | ||
1252 | VPRINTK("kcdrwd: sleeping\n"); | |
1253 | residue = schedule_timeout(min_sleep_time); | |
1254 | VPRINTK("kcdrwd: wake up\n"); | |
1255 | ||
1256 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1257 | try_to_freeze(); |
1da177e4 LT |
1258 | |
1259 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1260 | if (!pkt->sleep_time) | |
1261 | continue; | |
1262 | pkt->sleep_time -= min_sleep_time - residue; | |
1263 | if (pkt->sleep_time <= 0) { | |
1264 | pkt->sleep_time = 0; | |
1265 | atomic_inc(&pkt->run_sm); | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | if (signal_pending(current)) { | |
1270 | flush_signals(current); | |
1271 | } | |
1272 | if (kthread_should_stop()) | |
1273 | break; | |
1274 | } | |
1275 | work_to_do: | |
1276 | set_current_state(TASK_RUNNING); | |
1277 | remove_wait_queue(&pd->wqueue, &wait); | |
1278 | ||
1279 | if (kthread_should_stop()) | |
1280 | break; | |
1281 | ||
1282 | /* | |
1283 | * if pkt_handle_queue returns true, we can queue | |
1284 | * another request. | |
1285 | */ | |
1286 | while (pkt_handle_queue(pd)) | |
1287 | ; | |
1288 | ||
1289 | /* | |
1290 | * Handle packet state machine | |
1291 | */ | |
1292 | pkt_handle_packets(pd); | |
1293 | ||
1294 | /* | |
1295 | * Handle iosched queues | |
1296 | */ | |
1297 | pkt_iosched_process_queue(pd); | |
1298 | } | |
1299 | ||
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1304 | { | |
1305 | printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); | |
1306 | printk("%u blocks, ", pd->settings.size >> 2); | |
1307 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1308 | } | |
1309 | ||
1310 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1311 | { | |
1312 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1313 | ||
1314 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1315 | cgc->cmd[2] = page_code | (page_control << 6); | |
1316 | cgc->cmd[7] = cgc->buflen >> 8; | |
1317 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1318 | cgc->data_direction = CGC_DATA_READ; | |
1319 | return pkt_generic_packet(pd, cgc); | |
1320 | } | |
1321 | ||
1322 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1323 | { | |
1324 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1325 | memset(cgc->buffer, 0, 2); | |
1326 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1327 | cgc->cmd[1] = 0x10; /* PF */ | |
1328 | cgc->cmd[7] = cgc->buflen >> 8; | |
1329 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1330 | cgc->data_direction = CGC_DATA_WRITE; | |
1331 | return pkt_generic_packet(pd, cgc); | |
1332 | } | |
1333 | ||
1334 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1335 | { | |
1336 | struct packet_command cgc; | |
1337 | int ret; | |
1338 | ||
1339 | /* set up command and get the disc info */ | |
1340 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1341 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1342 | cgc.cmd[8] = cgc.buflen = 2; | |
1343 | cgc.quiet = 1; | |
1344 | ||
1345 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1346 | return ret; | |
1347 | ||
1348 | /* not all drives have the same disc_info length, so requeue | |
1349 | * packet with the length the drive tells us it can supply | |
1350 | */ | |
1351 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1352 | sizeof(di->disc_information_length); | |
1353 | ||
1354 | if (cgc.buflen > sizeof(disc_information)) | |
1355 | cgc.buflen = sizeof(disc_information); | |
1356 | ||
1357 | cgc.cmd[8] = cgc.buflen; | |
1358 | return pkt_generic_packet(pd, &cgc); | |
1359 | } | |
1360 | ||
1361 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1362 | { | |
1363 | struct packet_command cgc; | |
1364 | int ret; | |
1365 | ||
1366 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1367 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1368 | cgc.cmd[1] = type & 3; | |
1369 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1370 | cgc.cmd[5] = track & 0xff; | |
1371 | cgc.cmd[8] = 8; | |
1372 | cgc.quiet = 1; | |
1373 | ||
1374 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1375 | return ret; | |
1376 | ||
1377 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1378 | sizeof(ti->track_information_length); | |
1379 | ||
1380 | if (cgc.buflen > sizeof(track_information)) | |
1381 | cgc.buflen = sizeof(track_information); | |
1382 | ||
1383 | cgc.cmd[8] = cgc.buflen; | |
1384 | return pkt_generic_packet(pd, &cgc); | |
1385 | } | |
1386 | ||
1387 | static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written) | |
1388 | { | |
1389 | disc_information di; | |
1390 | track_information ti; | |
1391 | __u32 last_track; | |
1392 | int ret = -1; | |
1393 | ||
1394 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1395 | return ret; | |
1396 | ||
1397 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1398 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1399 | return ret; | |
1400 | ||
1401 | /* if this track is blank, try the previous. */ | |
1402 | if (ti.blank) { | |
1403 | last_track--; | |
1404 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1405 | return ret; | |
1406 | } | |
1407 | ||
1408 | /* if last recorded field is valid, return it. */ | |
1409 | if (ti.lra_v) { | |
1410 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1411 | } else { | |
1412 | /* make it up instead */ | |
1413 | *last_written = be32_to_cpu(ti.track_start) + | |
1414 | be32_to_cpu(ti.track_size); | |
1415 | if (ti.free_blocks) | |
1416 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1417 | } | |
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | /* | |
1422 | * write mode select package based on pd->settings | |
1423 | */ | |
1424 | static int pkt_set_write_settings(struct pktcdvd_device *pd) | |
1425 | { | |
1426 | struct packet_command cgc; | |
1427 | struct request_sense sense; | |
1428 | write_param_page *wp; | |
1429 | char buffer[128]; | |
1430 | int ret, size; | |
1431 | ||
1432 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1433 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1434 | return 0; | |
1435 | ||
1436 | memset(buffer, 0, sizeof(buffer)); | |
1437 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1438 | cgc.sense = &sense; | |
1439 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1440 | pkt_dump_sense(&cgc); | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1445 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1446 | if (size > sizeof(buffer)) | |
1447 | size = sizeof(buffer); | |
1448 | ||
1449 | /* | |
1450 | * now get it all | |
1451 | */ | |
1452 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1453 | cgc.sense = &sense; | |
1454 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1455 | pkt_dump_sense(&cgc); | |
1456 | return ret; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * write page is offset header + block descriptor length | |
1461 | */ | |
1462 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1463 | ||
1464 | wp->fp = pd->settings.fp; | |
1465 | wp->track_mode = pd->settings.track_mode; | |
1466 | wp->write_type = pd->settings.write_type; | |
1467 | wp->data_block_type = pd->settings.block_mode; | |
1468 | ||
1469 | wp->multi_session = 0; | |
1470 | ||
1471 | #ifdef PACKET_USE_LS | |
1472 | wp->link_size = 7; | |
1473 | wp->ls_v = 1; | |
1474 | #endif | |
1475 | ||
1476 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1477 | wp->session_format = 0; | |
1478 | wp->subhdr2 = 0x20; | |
1479 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1480 | wp->session_format = 0x20; | |
1481 | wp->subhdr2 = 8; | |
1482 | #if 0 | |
1483 | wp->mcn[0] = 0x80; | |
1484 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1485 | #endif | |
1486 | } else { | |
1487 | /* | |
1488 | * paranoia | |
1489 | */ | |
1490 | printk("pktcdvd: write mode wrong %d\n", wp->data_block_type); | |
1491 | return 1; | |
1492 | } | |
1493 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1494 | ||
1495 | cgc.buflen = cgc.cmd[8] = size; | |
1496 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1497 | pkt_dump_sense(&cgc); | |
1498 | return ret; | |
1499 | } | |
1500 | ||
1501 | pkt_print_settings(pd); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * 0 -- we can write to this track, 1 -- we can't | |
1507 | */ | |
1508 | static int pkt_good_track(track_information *ti) | |
1509 | { | |
1510 | /* | |
1511 | * only good for CD-RW at the moment, not DVD-RW | |
1512 | */ | |
1513 | ||
1514 | /* | |
1515 | * FIXME: only for FP | |
1516 | */ | |
1517 | if (ti->fp == 0) | |
1518 | return 0; | |
1519 | ||
1520 | /* | |
1521 | * "good" settings as per Mt Fuji. | |
1522 | */ | |
1523 | if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1) | |
1524 | return 0; | |
1525 | ||
1526 | if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1) | |
1527 | return 0; | |
1528 | ||
1529 | if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1) | |
1530 | return 0; | |
1531 | ||
1532 | printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); | |
1533 | return 1; | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * 0 -- we can write to this disc, 1 -- we can't | |
1538 | */ | |
1539 | static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di) | |
1540 | { | |
1541 | switch (pd->mmc3_profile) { | |
1542 | case 0x0a: /* CD-RW */ | |
1543 | case 0xffff: /* MMC3 not supported */ | |
1544 | break; | |
1545 | case 0x1a: /* DVD+RW */ | |
1546 | case 0x13: /* DVD-RW */ | |
1547 | case 0x12: /* DVD-RAM */ | |
1548 | return 0; | |
1549 | default: | |
1550 | printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile); | |
1551 | return 1; | |
1552 | } | |
1553 | ||
1554 | /* | |
1555 | * for disc type 0xff we should probably reserve a new track. | |
1556 | * but i'm not sure, should we leave this to user apps? probably. | |
1557 | */ | |
1558 | if (di->disc_type == 0xff) { | |
1559 | printk("pktcdvd: Unknown disc. No track?\n"); | |
1560 | return 1; | |
1561 | } | |
1562 | ||
1563 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
1564 | printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type); | |
1565 | return 1; | |
1566 | } | |
1567 | ||
1568 | if (di->erasable == 0) { | |
1569 | printk("pktcdvd: Disc not erasable\n"); | |
1570 | return 1; | |
1571 | } | |
1572 | ||
1573 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
1574 | printk("pktcdvd: Can't write to last track (reserved)\n"); | |
1575 | return 1; | |
1576 | } | |
1577 | ||
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | static int pkt_probe_settings(struct pktcdvd_device *pd) | |
1582 | { | |
1583 | struct packet_command cgc; | |
1584 | unsigned char buf[12]; | |
1585 | disc_information di; | |
1586 | track_information ti; | |
1587 | int ret, track; | |
1588 | ||
1589 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1590 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1591 | cgc.cmd[8] = 8; | |
1592 | ret = pkt_generic_packet(pd, &cgc); | |
1593 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1594 | ||
1595 | memset(&di, 0, sizeof(disc_information)); | |
1596 | memset(&ti, 0, sizeof(track_information)); | |
1597 | ||
1598 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
1599 | printk("failed get_disc\n"); | |
1600 | return ret; | |
1601 | } | |
1602 | ||
1603 | if (pkt_good_disc(pd, &di)) | |
1604 | return -ENXIO; | |
1605 | ||
1606 | switch (pd->mmc3_profile) { | |
1607 | case 0x1a: /* DVD+RW */ | |
1608 | printk("pktcdvd: inserted media is DVD+RW\n"); | |
1609 | break; | |
1610 | case 0x13: /* DVD-RW */ | |
1611 | printk("pktcdvd: inserted media is DVD-RW\n"); | |
1612 | break; | |
1613 | case 0x12: /* DVD-RAM */ | |
1614 | printk("pktcdvd: inserted media is DVD-RAM\n"); | |
1615 | break; | |
1616 | default: | |
1617 | printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : ""); | |
1618 | break; | |
1619 | } | |
1620 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; | |
1621 | ||
1622 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1623 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
1624 | printk("pktcdvd: failed get_track\n"); | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | if (pkt_good_track(&ti)) { | |
1629 | printk("pktcdvd: can't write to this track\n"); | |
1630 | return -ENXIO; | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * we keep packet size in 512 byte units, makes it easier to | |
1635 | * deal with request calculations. | |
1636 | */ | |
1637 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1638 | if (pd->settings.size == 0) { | |
1639 | printk("pktcdvd: detected zero packet size!\n"); | |
a460ad62 | 1640 | return -ENXIO; |
1da177e4 | 1641 | } |
d0272e78 PO |
1642 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
1643 | printk("pktcdvd: packet size is too big\n"); | |
1644 | return -ENXIO; | |
1645 | } | |
1da177e4 LT |
1646 | pd->settings.fp = ti.fp; |
1647 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1648 | ||
1649 | if (ti.nwa_v) { | |
1650 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1651 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * in theory we could use lra on -RW media as well and just zero | |
1656 | * blocks that haven't been written yet, but in practice that | |
1657 | * is just a no-go. we'll use that for -R, naturally. | |
1658 | */ | |
1659 | if (ti.lra_v) { | |
1660 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1661 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1662 | } else { | |
1663 | pd->lra = 0xffffffff; | |
1664 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * fine for now | |
1669 | */ | |
1670 | pd->settings.link_loss = 7; | |
1671 | pd->settings.write_type = 0; /* packet */ | |
1672 | pd->settings.track_mode = ti.track_mode; | |
1673 | ||
1674 | /* | |
1675 | * mode1 or mode2 disc | |
1676 | */ | |
1677 | switch (ti.data_mode) { | |
1678 | case PACKET_MODE1: | |
1679 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1680 | break; | |
1681 | case PACKET_MODE2: | |
1682 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1683 | break; | |
1684 | default: | |
1685 | printk("pktcdvd: unknown data mode\n"); | |
1686 | return 1; | |
1687 | } | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * enable/disable write caching on drive | |
1693 | */ | |
1694 | static int pkt_write_caching(struct pktcdvd_device *pd, int set) | |
1695 | { | |
1696 | struct packet_command cgc; | |
1697 | struct request_sense sense; | |
1698 | unsigned char buf[64]; | |
1699 | int ret; | |
1700 | ||
1701 | memset(buf, 0, sizeof(buf)); | |
1702 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1703 | cgc.sense = &sense; | |
1704 | cgc.buflen = pd->mode_offset + 12; | |
1705 | ||
1706 | /* | |
1707 | * caching mode page might not be there, so quiet this command | |
1708 | */ | |
1709 | cgc.quiet = 1; | |
1710 | ||
1711 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1712 | return ret; | |
1713 | ||
1714 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1715 | ||
1716 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1717 | ret = pkt_mode_select(pd, &cgc); | |
1718 | if (ret) { | |
1719 | printk("pktcdvd: write caching control failed\n"); | |
1720 | pkt_dump_sense(&cgc); | |
1721 | } else if (!ret && set) | |
1722 | printk("pktcdvd: enabled write caching on %s\n", pd->name); | |
1723 | return ret; | |
1724 | } | |
1725 | ||
1726 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1727 | { | |
1728 | struct packet_command cgc; | |
1729 | ||
1730 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1731 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1732 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1733 | return pkt_generic_packet(pd, &cgc); | |
1734 | } | |
1735 | ||
1736 | /* | |
1737 | * Returns drive maximum write speed | |
1738 | */ | |
1739 | static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed) | |
1740 | { | |
1741 | struct packet_command cgc; | |
1742 | struct request_sense sense; | |
1743 | unsigned char buf[256+18]; | |
1744 | unsigned char *cap_buf; | |
1745 | int ret, offset; | |
1746 | ||
1747 | memset(buf, 0, sizeof(buf)); | |
1748 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1749 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1750 | cgc.sense = &sense; | |
1751 | ||
1752 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1753 | if (ret) { | |
1754 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1755 | sizeof(struct mode_page_header); | |
1756 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1757 | if (ret) { | |
1758 | pkt_dump_sense(&cgc); | |
1759 | return ret; | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | offset = 20; /* Obsoleted field, used by older drives */ | |
1764 | if (cap_buf[1] >= 28) | |
1765 | offset = 28; /* Current write speed selected */ | |
1766 | if (cap_buf[1] >= 30) { | |
1767 | /* If the drive reports at least one "Logical Unit Write | |
1768 | * Speed Performance Descriptor Block", use the information | |
1769 | * in the first block. (contains the highest speed) | |
1770 | */ | |
1771 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
1772 | if (num_spdb > 0) | |
1773 | offset = 34; | |
1774 | } | |
1775 | ||
1776 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | /* These tables from cdrecord - I don't have orange book */ | |
1781 | /* standard speed CD-RW (1-4x) */ | |
1782 | static char clv_to_speed[16] = { | |
1783 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1784 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1785 | }; | |
1786 | /* high speed CD-RW (-10x) */ | |
1787 | static char hs_clv_to_speed[16] = { | |
1788 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1789 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1790 | }; | |
1791 | /* ultra high speed CD-RW */ | |
1792 | static char us_clv_to_speed[16] = { | |
1793 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1794 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
1795 | }; | |
1796 | ||
1797 | /* | |
1798 | * reads the maximum media speed from ATIP | |
1799 | */ | |
1800 | static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed) | |
1801 | { | |
1802 | struct packet_command cgc; | |
1803 | struct request_sense sense; | |
1804 | unsigned char buf[64]; | |
1805 | unsigned int size, st, sp; | |
1806 | int ret; | |
1807 | ||
1808 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
1809 | cgc.sense = &sense; | |
1810 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
1811 | cgc.cmd[1] = 2; | |
1812 | cgc.cmd[2] = 4; /* READ ATIP */ | |
1813 | cgc.cmd[8] = 2; | |
1814 | ret = pkt_generic_packet(pd, &cgc); | |
1815 | if (ret) { | |
1816 | pkt_dump_sense(&cgc); | |
1817 | return ret; | |
1818 | } | |
1819 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
1820 | if (size > sizeof(buf)) | |
1821 | size = sizeof(buf); | |
1822 | ||
1823 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
1824 | cgc.sense = &sense; | |
1825 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
1826 | cgc.cmd[1] = 2; | |
1827 | cgc.cmd[2] = 4; | |
1828 | cgc.cmd[8] = size; | |
1829 | ret = pkt_generic_packet(pd, &cgc); | |
1830 | if (ret) { | |
1831 | pkt_dump_sense(&cgc); | |
1832 | return ret; | |
1833 | } | |
1834 | ||
1835 | if (!buf[6] & 0x40) { | |
1836 | printk("pktcdvd: Disc type is not CD-RW\n"); | |
1837 | return 1; | |
1838 | } | |
1839 | if (!buf[6] & 0x4) { | |
1840 | printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n"); | |
1841 | return 1; | |
1842 | } | |
1843 | ||
1844 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
1845 | ||
1846 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
1847 | ||
1848 | /* Info from cdrecord */ | |
1849 | switch (st) { | |
1850 | case 0: /* standard speed */ | |
1851 | *speed = clv_to_speed[sp]; | |
1852 | break; | |
1853 | case 1: /* high speed */ | |
1854 | *speed = hs_clv_to_speed[sp]; | |
1855 | break; | |
1856 | case 2: /* ultra high speed */ | |
1857 | *speed = us_clv_to_speed[sp]; | |
1858 | break; | |
1859 | default: | |
1860 | printk("pktcdvd: Unknown disc sub-type %d\n",st); | |
1861 | return 1; | |
1862 | } | |
1863 | if (*speed) { | |
1864 | printk("pktcdvd: Max. media speed: %d\n",*speed); | |
1865 | return 0; | |
1866 | } else { | |
1867 | printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st); | |
1868 | return 1; | |
1869 | } | |
1870 | } | |
1871 | ||
1872 | static int pkt_perform_opc(struct pktcdvd_device *pd) | |
1873 | { | |
1874 | struct packet_command cgc; | |
1875 | struct request_sense sense; | |
1876 | int ret; | |
1877 | ||
1878 | VPRINTK("pktcdvd: Performing OPC\n"); | |
1879 | ||
1880 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1881 | cgc.sense = &sense; | |
1882 | cgc.timeout = 60*HZ; | |
1883 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
1884 | cgc.cmd[1] = 1; | |
1885 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1886 | pkt_dump_sense(&cgc); | |
1887 | return ret; | |
1888 | } | |
1889 | ||
1890 | static int pkt_open_write(struct pktcdvd_device *pd) | |
1891 | { | |
1892 | int ret; | |
1893 | unsigned int write_speed, media_write_speed, read_speed; | |
1894 | ||
1895 | if ((ret = pkt_probe_settings(pd))) { | |
1896 | DPRINTK("pktcdvd: %s failed probe\n", pd->name); | |
1897 | return -EIO; | |
1898 | } | |
1899 | ||
1900 | if ((ret = pkt_set_write_settings(pd))) { | |
1901 | DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name); | |
1902 | return -EIO; | |
1903 | } | |
1904 | ||
1905 | pkt_write_caching(pd, USE_WCACHING); | |
1906 | ||
1907 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
1908 | write_speed = 16 * 177; | |
1909 | switch (pd->mmc3_profile) { | |
1910 | case 0x13: /* DVD-RW */ | |
1911 | case 0x1a: /* DVD+RW */ | |
1912 | case 0x12: /* DVD-RAM */ | |
1913 | DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed); | |
1914 | break; | |
1915 | default: | |
1916 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
1917 | media_write_speed = 16; | |
1918 | write_speed = min(write_speed, media_write_speed * 177); | |
1919 | DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176); | |
1920 | break; | |
1921 | } | |
1922 | read_speed = write_speed; | |
1923 | ||
1924 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
1925 | DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name); | |
1926 | return -EIO; | |
1927 | } | |
1928 | pd->write_speed = write_speed; | |
1929 | pd->read_speed = read_speed; | |
1930 | ||
1931 | if ((ret = pkt_perform_opc(pd))) { | |
1932 | DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name); | |
1933 | } | |
1934 | ||
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * called at open time. | |
1940 | */ | |
1941 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) | |
1942 | { | |
1943 | int ret; | |
1944 | long lba; | |
1945 | request_queue_t *q; | |
1946 | ||
1947 | /* | |
1948 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
1949 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
1950 | * so bdget() can't fail. | |
1951 | */ | |
1952 | bdget(pd->bdev->bd_dev); | |
1953 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) | |
1954 | goto out; | |
1955 | ||
8382bf2e PO |
1956 | if ((ret = bd_claim(pd->bdev, pd))) |
1957 | goto out_putdev; | |
1958 | ||
1da177e4 LT |
1959 | if ((ret = pkt_get_last_written(pd, &lba))) { |
1960 | printk("pktcdvd: pkt_get_last_written failed\n"); | |
8382bf2e | 1961 | goto out_unclaim; |
1da177e4 LT |
1962 | } |
1963 | ||
1964 | set_capacity(pd->disk, lba << 2); | |
1965 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
1966 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
1967 | ||
1968 | q = bdev_get_queue(pd->bdev); | |
1969 | if (write) { | |
1970 | if ((ret = pkt_open_write(pd))) | |
8382bf2e | 1971 | goto out_unclaim; |
1da177e4 LT |
1972 | /* |
1973 | * Some CDRW drives can not handle writes larger than one packet, | |
1974 | * even if the size is a multiple of the packet size. | |
1975 | */ | |
1976 | spin_lock_irq(q->queue_lock); | |
1977 | blk_queue_max_sectors(q, pd->settings.size); | |
1978 | spin_unlock_irq(q->queue_lock); | |
1979 | set_bit(PACKET_WRITABLE, &pd->flags); | |
1980 | } else { | |
1981 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
1982 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
1983 | } | |
1984 | ||
1985 | if ((ret = pkt_set_segment_merging(pd, q))) | |
8382bf2e | 1986 | goto out_unclaim; |
1da177e4 LT |
1987 | |
1988 | if (write) | |
1989 | printk("pktcdvd: %lukB available on disc\n", lba << 1); | |
1990 | ||
1991 | return 0; | |
1992 | ||
8382bf2e PO |
1993 | out_unclaim: |
1994 | bd_release(pd->bdev); | |
1da177e4 LT |
1995 | out_putdev: |
1996 | blkdev_put(pd->bdev); | |
1997 | out: | |
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * called when the device is closed. makes sure that the device flushes | |
2003 | * the internal cache before we close. | |
2004 | */ | |
2005 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2006 | { | |
2007 | if (flush && pkt_flush_cache(pd)) | |
2008 | DPRINTK("pktcdvd: %s not flushing cache\n", pd->name); | |
2009 | ||
2010 | pkt_lock_door(pd, 0); | |
2011 | ||
2012 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
8382bf2e | 2013 | bd_release(pd->bdev); |
1da177e4 LT |
2014 | blkdev_put(pd->bdev); |
2015 | } | |
2016 | ||
2017 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) | |
2018 | { | |
2019 | if (dev_minor >= MAX_WRITERS) | |
2020 | return NULL; | |
2021 | return pkt_devs[dev_minor]; | |
2022 | } | |
2023 | ||
2024 | static int pkt_open(struct inode *inode, struct file *file) | |
2025 | { | |
2026 | struct pktcdvd_device *pd = NULL; | |
2027 | int ret; | |
2028 | ||
2029 | VPRINTK("pktcdvd: entering open\n"); | |
2030 | ||
2031 | down(&ctl_mutex); | |
2032 | pd = pkt_find_dev_from_minor(iminor(inode)); | |
2033 | if (!pd) { | |
2034 | ret = -ENODEV; | |
2035 | goto out; | |
2036 | } | |
2037 | BUG_ON(pd->refcnt < 0); | |
2038 | ||
2039 | pd->refcnt++; | |
46f4e1b7 PO |
2040 | if (pd->refcnt > 1) { |
2041 | if ((file->f_mode & FMODE_WRITE) && | |
2042 | !test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2043 | ret = -EBUSY; | |
2044 | goto out_dec; | |
2045 | } | |
2046 | } else { | |
1da177e4 LT |
2047 | if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) { |
2048 | ret = -EIO; | |
2049 | goto out_dec; | |
2050 | } | |
2051 | /* | |
2052 | * needed here as well, since ext2 (among others) may change | |
2053 | * the blocksize at mount time | |
2054 | */ | |
2055 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); | |
2056 | } | |
2057 | ||
2058 | up(&ctl_mutex); | |
2059 | return 0; | |
2060 | ||
2061 | out_dec: | |
2062 | pd->refcnt--; | |
2063 | out: | |
2064 | VPRINTK("pktcdvd: failed open (%d)\n", ret); | |
2065 | up(&ctl_mutex); | |
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | static int pkt_close(struct inode *inode, struct file *file) | |
2070 | { | |
2071 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2072 | int ret = 0; | |
2073 | ||
2074 | down(&ctl_mutex); | |
2075 | pd->refcnt--; | |
2076 | BUG_ON(pd->refcnt < 0); | |
2077 | if (pd->refcnt == 0) { | |
2078 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2079 | pkt_release_dev(pd, flush); | |
2080 | } | |
2081 | up(&ctl_mutex); | |
2082 | return ret; | |
2083 | } | |
2084 | ||
2085 | ||
dd0fc66f | 2086 | static void *psd_pool_alloc(gfp_t gfp_mask, void *data) |
1da177e4 LT |
2087 | { |
2088 | return kmalloc(sizeof(struct packet_stacked_data), gfp_mask); | |
2089 | } | |
2090 | ||
2091 | static void psd_pool_free(void *ptr, void *data) | |
2092 | { | |
2093 | kfree(ptr); | |
2094 | } | |
2095 | ||
2096 | static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err) | |
2097 | { | |
2098 | struct packet_stacked_data *psd = bio->bi_private; | |
2099 | struct pktcdvd_device *pd = psd->pd; | |
2100 | ||
2101 | if (bio->bi_size) | |
2102 | return 1; | |
2103 | ||
2104 | bio_put(bio); | |
2105 | bio_endio(psd->bio, psd->bio->bi_size, err); | |
2106 | mempool_free(psd, psd_pool); | |
2107 | pkt_bio_finished(pd); | |
2108 | return 0; | |
2109 | } | |
2110 | ||
2111 | static int pkt_make_request(request_queue_t *q, struct bio *bio) | |
2112 | { | |
2113 | struct pktcdvd_device *pd; | |
2114 | char b[BDEVNAME_SIZE]; | |
2115 | sector_t zone; | |
2116 | struct packet_data *pkt; | |
2117 | int was_empty, blocked_bio; | |
2118 | struct pkt_rb_node *node; | |
2119 | ||
2120 | pd = q->queuedata; | |
2121 | if (!pd) { | |
2122 | printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); | |
2123 | goto end_io; | |
2124 | } | |
2125 | ||
2126 | /* | |
2127 | * Clone READ bios so we can have our own bi_end_io callback. | |
2128 | */ | |
2129 | if (bio_data_dir(bio) == READ) { | |
2130 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2131 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2132 | ||
2133 | psd->pd = pd; | |
2134 | psd->bio = bio; | |
2135 | cloned_bio->bi_bdev = pd->bdev; | |
2136 | cloned_bio->bi_private = psd; | |
2137 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2138 | pd->stats.secs_r += bio->bi_size >> 9; | |
46c271be | 2139 | pkt_queue_bio(pd, cloned_bio); |
1da177e4 LT |
2140 | return 0; |
2141 | } | |
2142 | ||
2143 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2144 | printk("pktcdvd: WRITE for ro device %s (%llu)\n", | |
2145 | pd->name, (unsigned long long)bio->bi_sector); | |
2146 | goto end_io; | |
2147 | } | |
2148 | ||
2149 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
2150 | printk("pktcdvd: wrong bio size\n"); | |
2151 | goto end_io; | |
2152 | } | |
2153 | ||
2154 | blk_queue_bounce(q, &bio); | |
2155 | ||
2156 | zone = ZONE(bio->bi_sector, pd); | |
2157 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2158 | (unsigned long long)bio->bi_sector, | |
2159 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2160 | ||
2161 | /* Check if we have to split the bio */ | |
2162 | { | |
2163 | struct bio_pair *bp; | |
2164 | sector_t last_zone; | |
2165 | int first_sectors; | |
2166 | ||
2167 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2168 | if (last_zone != zone) { | |
2169 | BUG_ON(last_zone != zone + pd->settings.size); | |
2170 | first_sectors = last_zone - bio->bi_sector; | |
2171 | bp = bio_split(bio, bio_split_pool, first_sectors); | |
2172 | BUG_ON(!bp); | |
2173 | pkt_make_request(q, &bp->bio1); | |
2174 | pkt_make_request(q, &bp->bio2); | |
2175 | bio_pair_release(bp); | |
2176 | return 0; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | /* | |
2181 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2182 | * just append this bio to that packet. | |
2183 | */ | |
2184 | spin_lock(&pd->cdrw.active_list_lock); | |
2185 | blocked_bio = 0; | |
2186 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2187 | if (pkt->sector == zone) { | |
2188 | spin_lock(&pkt->lock); | |
2189 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2190 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2191 | pkt_add_list_last(bio, &pkt->orig_bios, | |
2192 | &pkt->orig_bios_tail); | |
2193 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
2194 | if ((pkt->write_size >= pkt->frames) && | |
2195 | (pkt->state == PACKET_WAITING_STATE)) { | |
2196 | atomic_inc(&pkt->run_sm); | |
2197 | wake_up(&pd->wqueue); | |
2198 | } | |
2199 | spin_unlock(&pkt->lock); | |
2200 | spin_unlock(&pd->cdrw.active_list_lock); | |
2201 | return 0; | |
2202 | } else { | |
2203 | blocked_bio = 1; | |
2204 | } | |
2205 | spin_unlock(&pkt->lock); | |
2206 | } | |
2207 | } | |
2208 | spin_unlock(&pd->cdrw.active_list_lock); | |
2209 | ||
2210 | /* | |
2211 | * No matching packet found. Store the bio in the work queue. | |
2212 | */ | |
2213 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2214 | node->bio = bio; |
2215 | spin_lock(&pd->lock); | |
2216 | BUG_ON(pd->bio_queue_size < 0); | |
2217 | was_empty = (pd->bio_queue_size == 0); | |
2218 | pkt_rbtree_insert(pd, node); | |
2219 | spin_unlock(&pd->lock); | |
2220 | ||
2221 | /* | |
2222 | * Wake up the worker thread. | |
2223 | */ | |
2224 | atomic_set(&pd->scan_queue, 1); | |
2225 | if (was_empty) { | |
2226 | /* This wake_up is required for correct operation */ | |
2227 | wake_up(&pd->wqueue); | |
2228 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2229 | /* | |
2230 | * This wake up is not required for correct operation, | |
2231 | * but improves performance in some cases. | |
2232 | */ | |
2233 | wake_up(&pd->wqueue); | |
2234 | } | |
2235 | return 0; | |
2236 | end_io: | |
2237 | bio_io_error(bio, bio->bi_size); | |
2238 | return 0; | |
2239 | } | |
2240 | ||
2241 | ||
2242 | ||
2243 | static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec) | |
2244 | { | |
2245 | struct pktcdvd_device *pd = q->queuedata; | |
2246 | sector_t zone = ZONE(bio->bi_sector, pd); | |
2247 | int used = ((bio->bi_sector - zone) << 9) + bio->bi_size; | |
2248 | int remaining = (pd->settings.size << 9) - used; | |
2249 | int remaining2; | |
2250 | ||
2251 | /* | |
2252 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2253 | * boundary, pkt_make_request() will split the bio. | |
2254 | */ | |
2255 | remaining2 = PAGE_SIZE - bio->bi_size; | |
2256 | remaining = max(remaining, remaining2); | |
2257 | ||
2258 | BUG_ON(remaining < 0); | |
2259 | return remaining; | |
2260 | } | |
2261 | ||
2262 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2263 | { | |
2264 | request_queue_t *q = pd->disk->queue; | |
2265 | ||
2266 | blk_queue_make_request(q, pkt_make_request); | |
2267 | blk_queue_hardsect_size(q, CD_FRAMESIZE); | |
2268 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); | |
2269 | blk_queue_merge_bvec(q, pkt_merge_bvec); | |
2270 | q->queuedata = pd; | |
2271 | } | |
2272 | ||
2273 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2274 | { | |
2275 | struct pktcdvd_device *pd = m->private; | |
2276 | char *msg; | |
2277 | char bdev_buf[BDEVNAME_SIZE]; | |
2278 | int states[PACKET_NUM_STATES]; | |
2279 | ||
2280 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2281 | bdevname(pd->bdev, bdev_buf)); | |
2282 | ||
2283 | seq_printf(m, "\nSettings:\n"); | |
2284 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2285 | ||
2286 | if (pd->settings.write_type == 0) | |
2287 | msg = "Packet"; | |
2288 | else | |
2289 | msg = "Unknown"; | |
2290 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2291 | ||
2292 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2293 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2294 | ||
2295 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2296 | ||
2297 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2298 | msg = "Mode 1"; | |
2299 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2300 | msg = "Mode 2"; | |
2301 | else | |
2302 | msg = "Unknown"; | |
2303 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2304 | ||
2305 | seq_printf(m, "\nStatistics:\n"); | |
2306 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2307 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2308 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2309 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2310 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2311 | ||
2312 | seq_printf(m, "\nMisc:\n"); | |
2313 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2314 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2315 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2316 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2317 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2318 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2319 | ||
2320 | seq_printf(m, "\nQueue state:\n"); | |
2321 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2322 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2323 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2324 | ||
2325 | pkt_count_states(pd, states); | |
2326 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2327 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2328 | ||
2329 | return 0; | |
2330 | } | |
2331 | ||
2332 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2333 | { | |
2334 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2335 | } | |
2336 | ||
2337 | static struct file_operations pkt_proc_fops = { | |
2338 | .open = pkt_seq_open, | |
2339 | .read = seq_read, | |
2340 | .llseek = seq_lseek, | |
2341 | .release = single_release | |
2342 | }; | |
2343 | ||
2344 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2345 | { | |
2346 | int i; | |
2347 | int ret = 0; | |
2348 | char b[BDEVNAME_SIZE]; | |
2349 | struct proc_dir_entry *proc; | |
2350 | struct block_device *bdev; | |
2351 | ||
2352 | if (pd->pkt_dev == dev) { | |
2353 | printk("pktcdvd: Recursive setup not allowed\n"); | |
2354 | return -EBUSY; | |
2355 | } | |
2356 | for (i = 0; i < MAX_WRITERS; i++) { | |
2357 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2358 | if (!pd2) | |
2359 | continue; | |
2360 | if (pd2->bdev->bd_dev == dev) { | |
2361 | printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b)); | |
2362 | return -EBUSY; | |
2363 | } | |
2364 | if (pd2->pkt_dev == dev) { | |
2365 | printk("pktcdvd: Can't chain pktcdvd devices\n"); | |
2366 | return -EBUSY; | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | bdev = bdget(dev); | |
2371 | if (!bdev) | |
2372 | return -ENOMEM; | |
2373 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); | |
2374 | if (ret) | |
2375 | return ret; | |
2376 | ||
2377 | /* This is safe, since we have a reference from open(). */ | |
2378 | __module_get(THIS_MODULE); | |
2379 | ||
2380 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
2381 | printk("pktcdvd: not enough memory for buffers\n"); | |
2382 | ret = -ENOMEM; | |
2383 | goto out_mem; | |
2384 | } | |
2385 | ||
2386 | pd->bdev = bdev; | |
2387 | set_blocksize(bdev, CD_FRAMESIZE); | |
2388 | ||
2389 | pkt_init_queue(pd); | |
2390 | ||
2391 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2392 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2393 | if (IS_ERR(pd->cdrw.thread)) { | |
2394 | printk("pktcdvd: can't start kernel thread\n"); | |
2395 | ret = -ENOMEM; | |
2396 | goto out_thread; | |
2397 | } | |
2398 | ||
2399 | proc = create_proc_entry(pd->name, 0, pkt_proc); | |
2400 | if (proc) { | |
2401 | proc->data = pd; | |
2402 | proc->proc_fops = &pkt_proc_fops; | |
2403 | } | |
2404 | DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); | |
2405 | return 0; | |
2406 | ||
2407 | out_thread: | |
2408 | pkt_shrink_pktlist(pd); | |
2409 | out_mem: | |
2410 | blkdev_put(bdev); | |
2411 | /* This is safe: open() is still holding a reference. */ | |
2412 | module_put(THIS_MODULE); | |
2413 | return ret; | |
2414 | } | |
2415 | ||
2416 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2417 | { | |
2418 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2419 | ||
2420 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); | |
1da177e4 LT |
2421 | |
2422 | switch (cmd) { | |
2423 | /* | |
2424 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2425 | */ | |
2426 | case CDROMMULTISESSION: | |
2427 | case CDROMREADTOCENTRY: | |
2428 | case CDROM_LAST_WRITTEN: | |
2429 | case CDROM_SEND_PACKET: | |
2430 | case SCSI_IOCTL_SEND_COMMAND: | |
118326e9 | 2431 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2432 | |
2433 | case CDROMEJECT: | |
2434 | /* | |
2435 | * The door gets locked when the device is opened, so we | |
2436 | * have to unlock it or else the eject command fails. | |
2437 | */ | |
2438 | pkt_lock_door(pd, 0); | |
118326e9 | 2439 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2440 | |
2441 | default: | |
2442 | printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd); | |
2443 | return -ENOTTY; | |
2444 | } | |
2445 | ||
2446 | return 0; | |
2447 | } | |
2448 | ||
2449 | static int pkt_media_changed(struct gendisk *disk) | |
2450 | { | |
2451 | struct pktcdvd_device *pd = disk->private_data; | |
2452 | struct gendisk *attached_disk; | |
2453 | ||
2454 | if (!pd) | |
2455 | return 0; | |
2456 | if (!pd->bdev) | |
2457 | return 0; | |
2458 | attached_disk = pd->bdev->bd_disk; | |
2459 | if (!attached_disk) | |
2460 | return 0; | |
2461 | return attached_disk->fops->media_changed(attached_disk); | |
2462 | } | |
2463 | ||
2464 | static struct block_device_operations pktcdvd_ops = { | |
2465 | .owner = THIS_MODULE, | |
2466 | .open = pkt_open, | |
2467 | .release = pkt_close, | |
2468 | .ioctl = pkt_ioctl, | |
2469 | .media_changed = pkt_media_changed, | |
2470 | }; | |
2471 | ||
2472 | /* | |
2473 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2474 | */ | |
2475 | static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd) | |
2476 | { | |
2477 | int idx; | |
2478 | int ret = -ENOMEM; | |
2479 | struct pktcdvd_device *pd; | |
2480 | struct gendisk *disk; | |
2481 | dev_t dev = new_decode_dev(ctrl_cmd->dev); | |
2482 | ||
2483 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2484 | if (!pkt_devs[idx]) | |
2485 | break; | |
2486 | if (idx == MAX_WRITERS) { | |
2487 | printk("pktcdvd: max %d writers supported\n", MAX_WRITERS); | |
2488 | return -EBUSY; | |
2489 | } | |
2490 | ||
1107d2e0 | 2491 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 LT |
2492 | if (!pd) |
2493 | return ret; | |
1da177e4 LT |
2494 | |
2495 | pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL); | |
2496 | if (!pd->rb_pool) | |
2497 | goto out_mem; | |
2498 | ||
2499 | disk = alloc_disk(1); | |
2500 | if (!disk) | |
2501 | goto out_mem; | |
2502 | pd->disk = disk; | |
2503 | ||
2504 | spin_lock_init(&pd->lock); | |
2505 | spin_lock_init(&pd->iosched.lock); | |
2506 | sprintf(pd->name, "pktcdvd%d", idx); | |
2507 | init_waitqueue_head(&pd->wqueue); | |
2508 | pd->bio_queue = RB_ROOT; | |
2509 | ||
2510 | disk->major = pkt_major; | |
2511 | disk->first_minor = idx; | |
2512 | disk->fops = &pktcdvd_ops; | |
2513 | disk->flags = GENHD_FL_REMOVABLE; | |
2514 | sprintf(disk->disk_name, "pktcdvd%d", idx); | |
2515 | disk->private_data = pd; | |
2516 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2517 | if (!disk->queue) | |
2518 | goto out_mem2; | |
2519 | ||
2520 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); | |
2521 | ret = pkt_new_dev(pd, dev); | |
2522 | if (ret) | |
2523 | goto out_new_dev; | |
2524 | ||
2525 | add_disk(disk); | |
2526 | pkt_devs[idx] = pd; | |
2527 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2528 | return 0; | |
2529 | ||
2530 | out_new_dev: | |
2531 | blk_put_queue(disk->queue); | |
2532 | out_mem2: | |
2533 | put_disk(disk); | |
2534 | out_mem: | |
2535 | if (pd->rb_pool) | |
2536 | mempool_destroy(pd->rb_pool); | |
2537 | kfree(pd); | |
2538 | return ret; | |
2539 | } | |
2540 | ||
2541 | /* | |
2542 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2543 | */ | |
2544 | static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd) | |
2545 | { | |
2546 | struct pktcdvd_device *pd; | |
2547 | int idx; | |
2548 | dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev); | |
2549 | ||
2550 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2551 | pd = pkt_devs[idx]; | |
2552 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2553 | break; | |
2554 | } | |
2555 | if (idx == MAX_WRITERS) { | |
2556 | DPRINTK("pktcdvd: dev not setup\n"); | |
2557 | return -ENXIO; | |
2558 | } | |
2559 | ||
2560 | if (pd->refcnt > 0) | |
2561 | return -EBUSY; | |
2562 | ||
2563 | if (!IS_ERR(pd->cdrw.thread)) | |
2564 | kthread_stop(pd->cdrw.thread); | |
2565 | ||
2566 | blkdev_put(pd->bdev); | |
2567 | ||
2568 | pkt_shrink_pktlist(pd); | |
2569 | ||
2570 | remove_proc_entry(pd->name, pkt_proc); | |
2571 | DPRINTK("pktcdvd: writer %s unmapped\n", pd->name); | |
2572 | ||
2573 | del_gendisk(pd->disk); | |
2574 | blk_put_queue(pd->disk->queue); | |
2575 | put_disk(pd->disk); | |
2576 | ||
2577 | pkt_devs[idx] = NULL; | |
2578 | mempool_destroy(pd->rb_pool); | |
2579 | kfree(pd); | |
2580 | ||
2581 | /* This is safe: open() is still holding a reference. */ | |
2582 | module_put(THIS_MODULE); | |
2583 | return 0; | |
2584 | } | |
2585 | ||
2586 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2587 | { | |
2588 | struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
2589 | if (pd) { | |
2590 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2591 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2592 | } else { | |
2593 | ctrl_cmd->dev = 0; | |
2594 | ctrl_cmd->pkt_dev = 0; | |
2595 | } | |
2596 | ctrl_cmd->num_devices = MAX_WRITERS; | |
2597 | } | |
2598 | ||
2599 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2600 | { | |
2601 | void __user *argp = (void __user *)arg; | |
2602 | struct pkt_ctrl_command ctrl_cmd; | |
2603 | int ret = 0; | |
2604 | ||
2605 | if (cmd != PACKET_CTRL_CMD) | |
2606 | return -ENOTTY; | |
2607 | ||
2608 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2609 | return -EFAULT; | |
2610 | ||
2611 | switch (ctrl_cmd.command) { | |
2612 | case PKT_CTRL_CMD_SETUP: | |
2613 | if (!capable(CAP_SYS_ADMIN)) | |
2614 | return -EPERM; | |
2615 | down(&ctl_mutex); | |
2616 | ret = pkt_setup_dev(&ctrl_cmd); | |
2617 | up(&ctl_mutex); | |
2618 | break; | |
2619 | case PKT_CTRL_CMD_TEARDOWN: | |
2620 | if (!capable(CAP_SYS_ADMIN)) | |
2621 | return -EPERM; | |
2622 | down(&ctl_mutex); | |
2623 | ret = pkt_remove_dev(&ctrl_cmd); | |
2624 | up(&ctl_mutex); | |
2625 | break; | |
2626 | case PKT_CTRL_CMD_STATUS: | |
2627 | down(&ctl_mutex); | |
2628 | pkt_get_status(&ctrl_cmd); | |
2629 | up(&ctl_mutex); | |
2630 | break; | |
2631 | default: | |
2632 | return -ENOTTY; | |
2633 | } | |
2634 | ||
2635 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2636 | return -EFAULT; | |
2637 | return ret; | |
2638 | } | |
2639 | ||
2640 | ||
2641 | static struct file_operations pkt_ctl_fops = { | |
2642 | .ioctl = pkt_ctl_ioctl, | |
2643 | .owner = THIS_MODULE, | |
2644 | }; | |
2645 | ||
2646 | static struct miscdevice pkt_misc = { | |
2647 | .minor = MISC_DYNAMIC_MINOR, | |
2648 | .name = "pktcdvd", | |
2649 | .devfs_name = "pktcdvd/control", | |
2650 | .fops = &pkt_ctl_fops | |
2651 | }; | |
2652 | ||
2653 | static int __init pkt_init(void) | |
2654 | { | |
2655 | int ret; | |
2656 | ||
2657 | psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL); | |
2658 | if (!psd_pool) | |
2659 | return -ENOMEM; | |
2660 | ||
2661 | ret = register_blkdev(pkt_major, "pktcdvd"); | |
2662 | if (ret < 0) { | |
2663 | printk("pktcdvd: Unable to register block device\n"); | |
2664 | goto out2; | |
2665 | } | |
2666 | if (!pkt_major) | |
2667 | pkt_major = ret; | |
2668 | ||
2669 | ret = misc_register(&pkt_misc); | |
2670 | if (ret) { | |
2671 | printk("pktcdvd: Unable to register misc device\n"); | |
2672 | goto out; | |
2673 | } | |
2674 | ||
2675 | init_MUTEX(&ctl_mutex); | |
2676 | ||
2677 | pkt_proc = proc_mkdir("pktcdvd", proc_root_driver); | |
2678 | ||
1da177e4 LT |
2679 | return 0; |
2680 | ||
2681 | out: | |
2682 | unregister_blkdev(pkt_major, "pktcdvd"); | |
2683 | out2: | |
2684 | mempool_destroy(psd_pool); | |
2685 | return ret; | |
2686 | } | |
2687 | ||
2688 | static void __exit pkt_exit(void) | |
2689 | { | |
2690 | remove_proc_entry("pktcdvd", proc_root_driver); | |
2691 | misc_deregister(&pkt_misc); | |
2692 | unregister_blkdev(pkt_major, "pktcdvd"); | |
2693 | mempool_destroy(psd_pool); | |
2694 | } | |
2695 | ||
2696 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
2697 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
2698 | MODULE_LICENSE("GPL"); | |
2699 | ||
2700 | module_init(pkt_init); | |
2701 | module_exit(pkt_exit); |