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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> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, | |
16 | * but it doesn't know anything about the special restrictions that apply to | |
17 | * packet writing. One restriction is that write requests must be aligned to | |
18 | * packet boundaries on the physical media, and the size of a write request | |
19 | * must be equal to the packet size. Another restriction is that a | |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
21 | * command, if the previous command was a write. | |
22 | * | |
23 | * The purpose of the packet writing driver is to hide these restrictions from | |
24 | * higher layers, such as file systems, and present a block device that can be | |
25 | * randomly read and written using 2kB-sized blocks. | |
26 | * | |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
28 | * Its data is defined by the struct packet_iosched and includes two bio | |
29 | * queues with pending read and write requests. These queues are processed | |
30 | * by the pkt_iosched_process_queue() function. The write requests in this | |
31 | * queue are already properly aligned and sized. This layer is responsible for | |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
33 | * | |
34 | * The next layer transforms unaligned write requests to aligned writes. This | |
35 | * transformation requires reading missing pieces of data from the underlying | |
36 | * block device, assembling the pieces to full packets and queuing them to the | |
37 | * packet I/O scheduler. | |
38 | * | |
39 | * At the top layer there is a custom make_request_fn function that forwards | |
40 | * read requests directly to the iosched queue and puts write requests in the | |
41 | * unaligned write queue. A kernel thread performs the necessary read | |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
43 | * them to the packet I/O scheduler. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
1da177e4 | 47 | #include <linux/pktcdvd.h> |
1da177e4 LT |
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> | |
7dfb7103 | 58 | #include <linux/freezer.h> |
1657f824 | 59 | #include <linux/mutex.h> |
1da177e4 LT |
60 | #include <scsi/scsi_cmnd.h> |
61 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 62 | #include <scsi/scsi.h> |
1da177e4 LT |
63 | |
64 | #include <asm/uaccess.h> | |
65 | ||
7822082d TM |
66 | #define DRIVER_NAME "pktcdvd" |
67 | ||
1da177e4 LT |
68 | #if PACKET_DEBUG |
69 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
70 | #else | |
71 | #define DPRINTK(fmt, args...) | |
72 | #endif | |
73 | ||
74 | #if PACKET_DEBUG > 1 | |
75 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
76 | #else | |
77 | #define VPRINTK(fmt, args...) | |
78 | #endif | |
79 | ||
80 | #define MAX_SPEED 0xffff | |
81 | ||
82 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) | |
83 | ||
84 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; | |
85 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 86 | static int pktdev_major; |
0a0fc960 TM |
87 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
88 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 89 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
90 | static mempool_t *psd_pool; |
91 | ||
92 | ||
93 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
94 | { | |
95 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
96 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
7822082d | 97 | VPRINTK(DRIVER_NAME": queue empty\n"); |
1da177e4 LT |
98 | atomic_set(&pd->iosched.attention, 1); |
99 | wake_up(&pd->wqueue); | |
100 | } | |
101 | } | |
102 | ||
103 | static void pkt_bio_destructor(struct bio *bio) | |
104 | { | |
105 | kfree(bio->bi_io_vec); | |
106 | kfree(bio); | |
107 | } | |
108 | ||
109 | static struct bio *pkt_bio_alloc(int nr_iovecs) | |
110 | { | |
111 | struct bio_vec *bvl = NULL; | |
112 | struct bio *bio; | |
113 | ||
114 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); | |
115 | if (!bio) | |
116 | goto no_bio; | |
117 | bio_init(bio); | |
118 | ||
1107d2e0 | 119 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
1da177e4 LT |
120 | if (!bvl) |
121 | goto no_bvl; | |
1da177e4 LT |
122 | |
123 | bio->bi_max_vecs = nr_iovecs; | |
124 | bio->bi_io_vec = bvl; | |
125 | bio->bi_destructor = pkt_bio_destructor; | |
126 | ||
127 | return bio; | |
128 | ||
129 | no_bvl: | |
130 | kfree(bio); | |
131 | no_bio: | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Allocate a packet_data struct | |
137 | */ | |
e1bc89bc | 138 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
139 | { |
140 | int i; | |
141 | struct packet_data *pkt; | |
142 | ||
1107d2e0 | 143 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
144 | if (!pkt) |
145 | goto no_pkt; | |
1da177e4 | 146 | |
e1bc89bc PO |
147 | pkt->frames = frames; |
148 | pkt->w_bio = pkt_bio_alloc(frames); | |
1da177e4 LT |
149 | if (!pkt->w_bio) |
150 | goto no_bio; | |
151 | ||
e1bc89bc | 152 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
153 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
154 | if (!pkt->pages[i]) | |
155 | goto no_page; | |
156 | } | |
157 | ||
158 | spin_lock_init(&pkt->lock); | |
159 | ||
e1bc89bc | 160 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
161 | struct bio *bio = pkt_bio_alloc(1); |
162 | if (!bio) | |
163 | goto no_rd_bio; | |
164 | pkt->r_bios[i] = bio; | |
165 | } | |
166 | ||
167 | return pkt; | |
168 | ||
169 | no_rd_bio: | |
e1bc89bc | 170 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
171 | struct bio *bio = pkt->r_bios[i]; |
172 | if (bio) | |
173 | bio_put(bio); | |
174 | } | |
175 | ||
176 | no_page: | |
e1bc89bc | 177 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
178 | if (pkt->pages[i]) |
179 | __free_page(pkt->pages[i]); | |
180 | bio_put(pkt->w_bio); | |
181 | no_bio: | |
182 | kfree(pkt); | |
183 | no_pkt: | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Free a packet_data struct | |
189 | */ | |
190 | static void pkt_free_packet_data(struct packet_data *pkt) | |
191 | { | |
192 | int i; | |
193 | ||
e1bc89bc | 194 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
195 | struct bio *bio = pkt->r_bios[i]; |
196 | if (bio) | |
197 | bio_put(bio); | |
198 | } | |
e1bc89bc | 199 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
200 | __free_page(pkt->pages[i]); |
201 | bio_put(pkt->w_bio); | |
202 | kfree(pkt); | |
203 | } | |
204 | ||
205 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
206 | { | |
207 | struct packet_data *pkt, *next; | |
208 | ||
209 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
210 | ||
211 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
212 | pkt_free_packet_data(pkt); | |
213 | } | |
e1bc89bc | 214 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
215 | } |
216 | ||
217 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
218 | { | |
219 | struct packet_data *pkt; | |
220 | ||
e1bc89bc PO |
221 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
222 | ||
1da177e4 | 223 | while (nr_packets > 0) { |
e1bc89bc | 224 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
225 | if (!pkt) { |
226 | pkt_shrink_pktlist(pd); | |
227 | return 0; | |
228 | } | |
229 | pkt->id = nr_packets; | |
230 | pkt->pd = pd; | |
231 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
232 | nr_packets--; | |
233 | } | |
234 | return 1; | |
235 | } | |
236 | ||
1da177e4 LT |
237 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
238 | { | |
239 | struct rb_node *n = rb_next(&node->rb_node); | |
240 | if (!n) | |
241 | return NULL; | |
242 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
243 | } | |
244 | ||
ac893963 | 245 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
246 | { |
247 | rb_erase(&node->rb_node, &pd->bio_queue); | |
248 | mempool_free(node, pd->rb_pool); | |
249 | pd->bio_queue_size--; | |
250 | BUG_ON(pd->bio_queue_size < 0); | |
251 | } | |
252 | ||
253 | /* | |
254 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
255 | */ | |
256 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
257 | { | |
258 | struct rb_node *n = pd->bio_queue.rb_node; | |
259 | struct rb_node *next; | |
260 | struct pkt_rb_node *tmp; | |
261 | ||
262 | if (!n) { | |
263 | BUG_ON(pd->bio_queue_size > 0); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | for (;;) { | |
268 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
269 | if (s <= tmp->bio->bi_sector) | |
270 | next = n->rb_left; | |
271 | else | |
272 | next = n->rb_right; | |
273 | if (!next) | |
274 | break; | |
275 | n = next; | |
276 | } | |
277 | ||
278 | if (s > tmp->bio->bi_sector) { | |
279 | tmp = pkt_rbtree_next(tmp); | |
280 | if (!tmp) | |
281 | return NULL; | |
282 | } | |
283 | BUG_ON(s > tmp->bio->bi_sector); | |
284 | return tmp; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Insert a node into the pd->bio_queue rb tree. | |
289 | */ | |
290 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
291 | { | |
292 | struct rb_node **p = &pd->bio_queue.rb_node; | |
293 | struct rb_node *parent = NULL; | |
294 | sector_t s = node->bio->bi_sector; | |
295 | struct pkt_rb_node *tmp; | |
296 | ||
297 | while (*p) { | |
298 | parent = *p; | |
299 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
300 | if (s < tmp->bio->bi_sector) | |
301 | p = &(*p)->rb_left; | |
302 | else | |
303 | p = &(*p)->rb_right; | |
304 | } | |
305 | rb_link_node(&node->rb_node, parent, p); | |
306 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
307 | pd->bio_queue_size++; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Add a bio to a single linked list defined by its head and tail pointers. | |
312 | */ | |
ac893963 | 313 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
1da177e4 LT |
314 | { |
315 | bio->bi_next = NULL; | |
316 | if (*list_tail) { | |
317 | BUG_ON((*list_head) == NULL); | |
318 | (*list_tail)->bi_next = bio; | |
319 | (*list_tail) = bio; | |
320 | } else { | |
321 | BUG_ON((*list_head) != NULL); | |
322 | (*list_head) = bio; | |
323 | (*list_tail) = bio; | |
324 | } | |
325 | } | |
326 | ||
327 | /* | |
328 | * Remove and return the first bio from a single linked list defined by its | |
329 | * head and tail pointers. | |
330 | */ | |
331 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) | |
332 | { | |
333 | struct bio *bio; | |
334 | ||
335 | if (*list_head == NULL) | |
336 | return NULL; | |
337 | ||
338 | bio = *list_head; | |
339 | *list_head = bio->bi_next; | |
340 | if (*list_head == NULL) | |
341 | *list_tail = NULL; | |
342 | ||
343 | bio->bi_next = NULL; | |
344 | return bio; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Send a packet_command to the underlying block device and | |
349 | * wait for completion. | |
350 | */ | |
351 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
352 | { | |
353 | char sense[SCSI_SENSE_BUFFERSIZE]; | |
354 | request_queue_t *q; | |
355 | struct request *rq; | |
6e9a4738 | 356 | DECLARE_COMPLETION_ONSTACK(wait); |
1da177e4 LT |
357 | int err = 0; |
358 | ||
359 | q = bdev_get_queue(pd->bdev); | |
360 | ||
361 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ, | |
362 | __GFP_WAIT); | |
363 | rq->errors = 0; | |
364 | rq->rq_disk = pd->bdev->bd_disk; | |
365 | rq->bio = NULL; | |
366 | rq->buffer = NULL; | |
367 | rq->timeout = 60*HZ; | |
368 | rq->data = cgc->buffer; | |
369 | rq->data_len = cgc->buflen; | |
370 | rq->sense = sense; | |
371 | memset(sense, 0, sizeof(sense)); | |
372 | rq->sense_len = 0; | |
4aff5e23 JA |
373 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
374 | rq->cmd_flags |= REQ_HARDBARRIER; | |
1da177e4 | 375 | if (cgc->quiet) |
4aff5e23 | 376 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 LT |
377 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
378 | if (sizeof(rq->cmd) > CDROM_PACKET_SIZE) | |
379 | memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE); | |
cef28963 | 380 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); |
1da177e4 LT |
381 | |
382 | rq->ref_count++; | |
c00895ab | 383 | rq->end_io_data = &wait; |
1da177e4 LT |
384 | rq->end_io = blk_end_sync_rq; |
385 | elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1); | |
386 | generic_unplug_device(q); | |
387 | wait_for_completion(&wait); | |
388 | ||
389 | if (rq->errors) | |
390 | err = -EIO; | |
391 | ||
392 | blk_put_request(rq); | |
393 | return err; | |
394 | } | |
395 | ||
396 | /* | |
397 | * A generic sense dump / resolve mechanism should be implemented across | |
398 | * all ATAPI + SCSI devices. | |
399 | */ | |
400 | static void pkt_dump_sense(struct packet_command *cgc) | |
401 | { | |
402 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
403 | "Medium error", "Hardware error", "Illegal request", | |
404 | "Unit attention", "Data protect", "Blank check" }; | |
405 | int i; | |
406 | struct request_sense *sense = cgc->sense; | |
407 | ||
7822082d | 408 | printk(DRIVER_NAME":"); |
1da177e4 LT |
409 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
410 | printk(" %02x", cgc->cmd[i]); | |
411 | printk(" - "); | |
412 | ||
413 | if (sense == NULL) { | |
414 | printk("no sense\n"); | |
415 | return; | |
416 | } | |
417 | ||
418 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
419 | ||
420 | if (sense->sense_key > 8) { | |
421 | printk(" (INVALID)\n"); | |
422 | return; | |
423 | } | |
424 | ||
425 | printk(" (%s)\n", info[sense->sense_key]); | |
426 | } | |
427 | ||
428 | /* | |
429 | * flush the drive cache to media | |
430 | */ | |
431 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
432 | { | |
433 | struct packet_command cgc; | |
434 | ||
435 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
436 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
437 | cgc.quiet = 1; | |
438 | ||
439 | /* | |
440 | * the IMMED bit -- we default to not setting it, although that | |
441 | * would allow a much faster close, this is safer | |
442 | */ | |
443 | #if 0 | |
444 | cgc.cmd[1] = 1 << 1; | |
445 | #endif | |
446 | return pkt_generic_packet(pd, &cgc); | |
447 | } | |
448 | ||
449 | /* | |
450 | * speed is given as the normal factor, e.g. 4 for 4x | |
451 | */ | |
452 | static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed) | |
453 | { | |
454 | struct packet_command cgc; | |
455 | struct request_sense sense; | |
456 | int ret; | |
457 | ||
458 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
459 | cgc.sense = &sense; | |
460 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
461 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
462 | cgc.cmd[3] = read_speed & 0xff; | |
463 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
464 | cgc.cmd[5] = write_speed & 0xff; | |
465 | ||
466 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
467 | pkt_dump_sense(&cgc); | |
468 | ||
469 | return ret; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Queue a bio for processing by the low-level CD device. Must be called | |
474 | * from process context. | |
475 | */ | |
46c271be | 476 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
477 | { |
478 | spin_lock(&pd->iosched.lock); | |
479 | if (bio_data_dir(bio) == READ) { | |
480 | pkt_add_list_last(bio, &pd->iosched.read_queue, | |
481 | &pd->iosched.read_queue_tail); | |
1da177e4 LT |
482 | } else { |
483 | pkt_add_list_last(bio, &pd->iosched.write_queue, | |
484 | &pd->iosched.write_queue_tail); | |
485 | } | |
486 | spin_unlock(&pd->iosched.lock); | |
487 | ||
488 | atomic_set(&pd->iosched.attention, 1); | |
489 | wake_up(&pd->wqueue); | |
490 | } | |
491 | ||
492 | /* | |
493 | * Process the queued read/write requests. This function handles special | |
494 | * requirements for CDRW drives: | |
495 | * - A cache flush command must be inserted before a read request if the | |
496 | * previous request was a write. | |
46c271be | 497 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 498 | * than necessary. |
46c271be PO |
499 | * - Optimize for throughput at the expense of latency. This means that streaming |
500 | * writes will never be interrupted by a read, but if the drive has to seek | |
501 | * before the next write, switch to reading instead if there are any pending | |
502 | * read requests. | |
1da177e4 LT |
503 | * - Set the read speed according to current usage pattern. When only reading |
504 | * from the device, it's best to use the highest possible read speed, but | |
505 | * when switching often between reading and writing, it's better to have the | |
506 | * same read and write speeds. | |
1da177e4 LT |
507 | */ |
508 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
509 | { | |
1da177e4 LT |
510 | |
511 | if (atomic_read(&pd->iosched.attention) == 0) | |
512 | return; | |
513 | atomic_set(&pd->iosched.attention, 0); | |
514 | ||
1da177e4 LT |
515 | for (;;) { |
516 | struct bio *bio; | |
46c271be | 517 | int reads_queued, writes_queued; |
1da177e4 LT |
518 | |
519 | spin_lock(&pd->iosched.lock); | |
520 | reads_queued = (pd->iosched.read_queue != NULL); | |
521 | writes_queued = (pd->iosched.write_queue != NULL); | |
1da177e4 LT |
522 | spin_unlock(&pd->iosched.lock); |
523 | ||
524 | if (!reads_queued && !writes_queued) | |
525 | break; | |
526 | ||
527 | if (pd->iosched.writing) { | |
46c271be PO |
528 | int need_write_seek = 1; |
529 | spin_lock(&pd->iosched.lock); | |
530 | bio = pd->iosched.write_queue; | |
531 | spin_unlock(&pd->iosched.lock); | |
532 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
533 | need_write_seek = 0; | |
534 | if (need_write_seek && reads_queued) { | |
1da177e4 | 535 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
7822082d | 536 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
1da177e4 LT |
537 | break; |
538 | } | |
539 | pkt_flush_cache(pd); | |
540 | pd->iosched.writing = 0; | |
541 | } | |
542 | } else { | |
543 | if (!reads_queued && writes_queued) { | |
544 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
7822082d | 545 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
1da177e4 LT |
546 | break; |
547 | } | |
548 | pd->iosched.writing = 1; | |
549 | } | |
550 | } | |
551 | ||
552 | spin_lock(&pd->iosched.lock); | |
553 | if (pd->iosched.writing) { | |
554 | bio = pkt_get_list_first(&pd->iosched.write_queue, | |
555 | &pd->iosched.write_queue_tail); | |
556 | } else { | |
557 | bio = pkt_get_list_first(&pd->iosched.read_queue, | |
558 | &pd->iosched.read_queue_tail); | |
559 | } | |
560 | spin_unlock(&pd->iosched.lock); | |
561 | ||
562 | if (!bio) | |
563 | continue; | |
564 | ||
565 | if (bio_data_dir(bio) == READ) | |
566 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 567 | else { |
1da177e4 | 568 | pd->iosched.successive_reads = 0; |
46c271be PO |
569 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
570 | } | |
1da177e4 LT |
571 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
572 | if (pd->read_speed == pd->write_speed) { | |
573 | pd->read_speed = MAX_SPEED; | |
574 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
575 | } | |
576 | } else { | |
577 | if (pd->read_speed != pd->write_speed) { | |
578 | pd->read_speed = pd->write_speed; | |
579 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
580 | } | |
581 | } | |
582 | ||
583 | atomic_inc(&pd->cdrw.pending_bios); | |
584 | generic_make_request(bio); | |
585 | } | |
586 | } | |
587 | ||
588 | /* | |
589 | * Special care is needed if the underlying block device has a small | |
590 | * max_phys_segments value. | |
591 | */ | |
592 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q) | |
593 | { | |
594 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { | |
595 | /* | |
596 | * The cdrom device can handle one segment/frame | |
597 | */ | |
598 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
599 | return 0; | |
600 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { | |
601 | /* | |
602 | * We can handle this case at the expense of some extra memory | |
603 | * copies during write operations | |
604 | */ | |
605 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
606 | return 0; | |
607 | } else { | |
7822082d | 608 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
1da177e4 LT |
609 | return -EIO; |
610 | } | |
611 | } | |
612 | ||
613 | /* | |
614 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
615 | */ | |
616 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
617 | { | |
618 | unsigned int copy_size = CD_FRAMESIZE; | |
619 | ||
620 | while (copy_size > 0) { | |
621 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
622 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
623 | src_bvl->bv_offset + offs; | |
624 | void *vto = page_address(dst_page) + dst_offs; | |
625 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
626 | ||
627 | BUG_ON(len < 0); | |
628 | memcpy(vto, vfrom, len); | |
629 | kunmap_atomic(vfrom, KM_USER0); | |
630 | ||
631 | seg++; | |
632 | offs = 0; | |
633 | dst_offs += len; | |
634 | copy_size -= len; | |
635 | } | |
636 | } | |
637 | ||
638 | /* | |
639 | * Copy all data for this packet to pkt->pages[], so that | |
640 | * a) The number of required segments for the write bio is minimized, which | |
641 | * is necessary for some scsi controllers. | |
642 | * b) The data can be used as cache to avoid read requests if we receive a | |
643 | * new write request for the same zone. | |
644 | */ | |
72772323 | 645 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
646 | { |
647 | int f, p, offs; | |
648 | ||
649 | /* Copy all data to pkt->pages[] */ | |
650 | p = 0; | |
651 | offs = 0; | |
652 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
653 | if (bvec[f].bv_page != pkt->pages[p]) { |
654 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; | |
1da177e4 LT |
655 | void *vto = page_address(pkt->pages[p]) + offs; |
656 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
657 | kunmap_atomic(vfrom, KM_USER0); | |
72772323 PO |
658 | bvec[f].bv_page = pkt->pages[p]; |
659 | bvec[f].bv_offset = offs; | |
1da177e4 | 660 | } else { |
72772323 | 661 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
662 | } |
663 | offs += CD_FRAMESIZE; | |
664 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
665 | offs = 0; |
666 | p++; | |
667 | } | |
668 | } | |
669 | } | |
670 | ||
671 | static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err) | |
672 | { | |
673 | struct packet_data *pkt = bio->bi_private; | |
674 | struct pktcdvd_device *pd = pkt->pd; | |
675 | BUG_ON(!pd); | |
676 | ||
677 | if (bio->bi_size) | |
678 | return 1; | |
679 | ||
680 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, | |
681 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
682 | ||
683 | if (err) | |
684 | atomic_inc(&pkt->io_errors); | |
685 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
686 | atomic_inc(&pkt->run_sm); | |
687 | wake_up(&pd->wqueue); | |
688 | } | |
689 | pkt_bio_finished(pd); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err) | |
695 | { | |
696 | struct packet_data *pkt = bio->bi_private; | |
697 | struct pktcdvd_device *pd = pkt->pd; | |
698 | BUG_ON(!pd); | |
699 | ||
700 | if (bio->bi_size) | |
701 | return 1; | |
702 | ||
703 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); | |
704 | ||
705 | pd->stats.pkt_ended++; | |
706 | ||
707 | pkt_bio_finished(pd); | |
708 | atomic_dec(&pkt->io_wait); | |
709 | atomic_inc(&pkt->run_sm); | |
710 | wake_up(&pd->wqueue); | |
711 | return 0; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Schedule reads for the holes in a packet | |
716 | */ | |
717 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
718 | { | |
719 | int frames_read = 0; | |
720 | struct bio *bio; | |
721 | int f; | |
722 | char written[PACKET_MAX_SIZE]; | |
723 | ||
724 | BUG_ON(!pkt->orig_bios); | |
725 | ||
726 | atomic_set(&pkt->io_wait, 0); | |
727 | atomic_set(&pkt->io_errors, 0); | |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Figure out which frames we need to read before we can write. | |
731 | */ | |
732 | memset(written, 0, sizeof(written)); | |
733 | spin_lock(&pkt->lock); | |
734 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
735 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
736 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 737 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
738 | BUG_ON(first_frame < 0); |
739 | BUG_ON(first_frame + num_frames > pkt->frames); | |
740 | for (f = first_frame; f < first_frame + num_frames; f++) | |
741 | written[f] = 1; | |
742 | } | |
743 | spin_unlock(&pkt->lock); | |
744 | ||
06e7ab53 PO |
745 | if (pkt->cache_valid) { |
746 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
747 | (unsigned long long)pkt->sector); | |
748 | goto out_account; | |
749 | } | |
750 | ||
1da177e4 LT |
751 | /* |
752 | * Schedule reads for missing parts of the packet. | |
753 | */ | |
754 | for (f = 0; f < pkt->frames; f++) { | |
755 | int p, offset; | |
756 | if (written[f]) | |
757 | continue; | |
758 | bio = pkt->r_bios[f]; | |
759 | bio_init(bio); | |
760 | bio->bi_max_vecs = 1; | |
761 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
762 | bio->bi_bdev = pd->bdev; | |
763 | bio->bi_end_io = pkt_end_io_read; | |
764 | bio->bi_private = pkt; | |
765 | ||
766 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
767 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
768 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
769 | f, pkt->pages[p], offset); | |
770 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
771 | BUG(); | |
772 | ||
773 | atomic_inc(&pkt->io_wait); | |
774 | bio->bi_rw = READ; | |
46c271be | 775 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
776 | frames_read++; |
777 | } | |
778 | ||
779 | out_account: | |
780 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
781 | frames_read, (unsigned long long)pkt->sector); | |
782 | pd->stats.pkt_started++; | |
783 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
784 | } |
785 | ||
786 | /* | |
787 | * Find a packet matching zone, or the least recently used packet if | |
788 | * there is no match. | |
789 | */ | |
790 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
791 | { | |
792 | struct packet_data *pkt; | |
793 | ||
794 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
795 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
796 | list_del_init(&pkt->list); | |
797 | if (pkt->sector != zone) | |
798 | pkt->cache_valid = 0; | |
610827de | 799 | return pkt; |
1da177e4 LT |
800 | } |
801 | } | |
610827de PO |
802 | BUG(); |
803 | return NULL; | |
1da177e4 LT |
804 | } |
805 | ||
806 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
807 | { | |
808 | if (pkt->cache_valid) { | |
809 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
810 | } else { | |
811 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
812 | } | |
813 | } | |
814 | ||
815 | /* | |
816 | * recover a failed write, query for relocation if possible | |
817 | * | |
818 | * returns 1 if recovery is possible, or 0 if not | |
819 | * | |
820 | */ | |
821 | static int pkt_start_recovery(struct packet_data *pkt) | |
822 | { | |
823 | /* | |
824 | * FIXME. We need help from the file system to implement | |
825 | * recovery handling. | |
826 | */ | |
827 | return 0; | |
828 | #if 0 | |
829 | struct request *rq = pkt->rq; | |
830 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
831 | struct block_device *pkt_bdev; | |
832 | struct super_block *sb = NULL; | |
833 | unsigned long old_block, new_block; | |
834 | sector_t new_sector; | |
835 | ||
836 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
837 | if (pkt_bdev) { | |
838 | sb = get_super(pkt_bdev); | |
839 | bdput(pkt_bdev); | |
840 | } | |
841 | ||
842 | if (!sb) | |
843 | return 0; | |
844 | ||
845 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
846 | goto out; | |
847 | ||
848 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
849 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
850 | goto out; | |
851 | ||
852 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
853 | pkt->sector = new_sector; | |
854 | ||
855 | pkt->bio->bi_sector = new_sector; | |
856 | pkt->bio->bi_next = NULL; | |
857 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
858 | pkt->bio->bi_idx = 0; | |
859 | ||
860 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); | |
861 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); | |
862 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
863 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
864 | BUG_ON(pkt->bio->bi_private != pkt); | |
865 | ||
866 | drop_super(sb); | |
867 | return 1; | |
868 | ||
869 | out: | |
870 | drop_super(sb); | |
871 | return 0; | |
872 | #endif | |
873 | } | |
874 | ||
875 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
876 | { | |
877 | #if PACKET_DEBUG > 1 | |
878 | static const char *state_name[] = { | |
879 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
880 | }; | |
881 | enum packet_data_state old_state = pkt->state; | |
882 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
883 | state_name[old_state], state_name[state]); | |
884 | #endif | |
885 | pkt->state = state; | |
886 | } | |
887 | ||
888 | /* | |
889 | * Scan the work queue to see if we can start a new packet. | |
890 | * returns non-zero if any work was done. | |
891 | */ | |
892 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
893 | { | |
894 | struct packet_data *pkt, *p; | |
895 | struct bio *bio = NULL; | |
896 | sector_t zone = 0; /* Suppress gcc warning */ | |
897 | struct pkt_rb_node *node, *first_node; | |
898 | struct rb_node *n; | |
0a0fc960 | 899 | int wakeup; |
1da177e4 LT |
900 | |
901 | VPRINTK("handle_queue\n"); | |
902 | ||
903 | atomic_set(&pd->scan_queue, 0); | |
904 | ||
905 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
906 | VPRINTK("handle_queue: no pkt\n"); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /* | |
911 | * Try to find a zone we are not already working on. | |
912 | */ | |
913 | spin_lock(&pd->lock); | |
914 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
915 | if (!first_node) { | |
916 | n = rb_first(&pd->bio_queue); | |
917 | if (n) | |
918 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
919 | } | |
920 | node = first_node; | |
921 | while (node) { | |
922 | bio = node->bio; | |
923 | zone = ZONE(bio->bi_sector, pd); | |
924 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
7baeb6a5 PO |
925 | if (p->sector == zone) { |
926 | bio = NULL; | |
1da177e4 | 927 | goto try_next_bio; |
7baeb6a5 | 928 | } |
1da177e4 LT |
929 | } |
930 | break; | |
931 | try_next_bio: | |
932 | node = pkt_rbtree_next(node); | |
933 | if (!node) { | |
934 | n = rb_first(&pd->bio_queue); | |
935 | if (n) | |
936 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
937 | } | |
938 | if (node == first_node) | |
939 | node = NULL; | |
940 | } | |
941 | spin_unlock(&pd->lock); | |
942 | if (!bio) { | |
943 | VPRINTK("handle_queue: no bio\n"); | |
944 | return 0; | |
945 | } | |
946 | ||
947 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
948 | |
949 | pd->current_sector = zone + pd->settings.size; | |
950 | pkt->sector = zone; | |
e1bc89bc | 951 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
952 | pkt->write_size = 0; |
953 | ||
954 | /* | |
955 | * Scan work queue for bios in the same zone and link them | |
956 | * to this packet. | |
957 | */ | |
958 | spin_lock(&pd->lock); | |
959 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
960 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
961 | bio = node->bio; | |
962 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
963 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
964 | if (ZONE(bio->bi_sector, pd) != zone) | |
965 | break; | |
966 | pkt_rbtree_erase(pd, node); | |
967 | spin_lock(&pkt->lock); | |
968 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); | |
969 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
970 | spin_unlock(&pkt->lock); | |
971 | } | |
0a0fc960 TM |
972 | /* check write congestion marks, and if bio_queue_size is |
973 | below, wake up any waiters */ | |
974 | wakeup = (pd->write_congestion_on > 0 | |
975 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 976 | spin_unlock(&pd->lock); |
0a0fc960 TM |
977 | if (wakeup) |
978 | blk_clear_queue_congested(pd->disk->queue, WRITE); | |
1da177e4 LT |
979 | |
980 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
981 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
982 | atomic_set(&pkt->run_sm, 1); | |
983 | ||
984 | spin_lock(&pd->cdrw.active_list_lock); | |
985 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
986 | spin_unlock(&pd->cdrw.active_list_lock); | |
987 | ||
988 | return 1; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Assemble a bio to write one packet and queue the bio for processing | |
993 | * by the underlying block device. | |
994 | */ | |
995 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
996 | { | |
997 | struct bio *bio; | |
1da177e4 LT |
998 | int f; |
999 | int frames_write; | |
72772323 | 1000 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 LT |
1001 | |
1002 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1003 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1004 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | /* | |
72772323 | 1008 | * Fill-in bvec with data from orig_bios. |
1da177e4 LT |
1009 | */ |
1010 | frames_write = 0; | |
1011 | spin_lock(&pkt->lock); | |
1012 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1013 | int segment = bio->bi_idx; | |
1014 | int src_offs = 0; | |
1015 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1016 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1017 | BUG_ON(first_frame < 0); | |
1018 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1019 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1020 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1021 | ||
1022 | while (src_offs >= src_bvl->bv_len) { | |
1023 | src_offs -= src_bvl->bv_len; | |
1024 | segment++; | |
1025 | BUG_ON(segment >= bio->bi_vcnt); | |
1026 | src_bvl = bio_iovec_idx(bio, segment); | |
1027 | } | |
1028 | ||
1029 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
72772323 PO |
1030 | bvec[f].bv_page = src_bvl->bv_page; |
1031 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; | |
1da177e4 LT |
1032 | } else { |
1033 | pkt_copy_bio_data(bio, segment, src_offs, | |
72772323 | 1034 | bvec[f].bv_page, bvec[f].bv_offset); |
1da177e4 LT |
1035 | } |
1036 | src_offs += CD_FRAMESIZE; | |
1037 | frames_write++; | |
1038 | } | |
1039 | } | |
1040 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1041 | spin_unlock(&pkt->lock); | |
1042 | ||
1043 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1044 | frames_write, (unsigned long long)pkt->sector); | |
1045 | BUG_ON(frames_write != pkt->write_size); | |
1046 | ||
1047 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1048 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1049 | pkt->cache_valid = 1; |
1050 | } else { | |
1051 | pkt->cache_valid = 0; | |
1052 | } | |
1053 | ||
1054 | /* Start the write request */ | |
1055 | bio_init(pkt->w_bio); | |
1056 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1057 | pkt->w_bio->bi_sector = pkt->sector; | |
1058 | pkt->w_bio->bi_bdev = pd->bdev; | |
1059 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1060 | pkt->w_bio->bi_private = pkt; | |
72772323 PO |
1061 | for (f = 0; f < pkt->frames; f++) |
1062 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) | |
1063 | BUG(); | |
7822082d | 1064 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1065 | |
1066 | atomic_set(&pkt->io_wait, 1); | |
1067 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1068 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1072 | { | |
1073 | struct bio *bio, *next; | |
1074 | ||
1075 | if (!uptodate) | |
1076 | pkt->cache_valid = 0; | |
1077 | ||
1078 | /* Finish all bios corresponding to this packet */ | |
1079 | bio = pkt->orig_bios; | |
1080 | while (bio) { | |
1081 | next = bio->bi_next; | |
1082 | bio->bi_next = NULL; | |
1083 | bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO); | |
1084 | bio = next; | |
1085 | } | |
1086 | pkt->orig_bios = pkt->orig_bios_tail = NULL; | |
1087 | } | |
1088 | ||
1089 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1090 | { | |
1091 | int uptodate; | |
1092 | ||
1093 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1094 | ||
1095 | for (;;) { | |
1096 | switch (pkt->state) { | |
1097 | case PACKET_WAITING_STATE: | |
1098 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1099 | return; | |
1100 | ||
1101 | pkt->sleep_time = 0; | |
1102 | pkt_gather_data(pd, pkt); | |
1103 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1104 | break; | |
1105 | ||
1106 | case PACKET_READ_WAIT_STATE: | |
1107 | if (atomic_read(&pkt->io_wait) > 0) | |
1108 | return; | |
1109 | ||
1110 | if (atomic_read(&pkt->io_errors) > 0) { | |
1111 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1112 | } else { | |
1113 | pkt_start_write(pd, pkt); | |
1114 | } | |
1115 | break; | |
1116 | ||
1117 | case PACKET_WRITE_WAIT_STATE: | |
1118 | if (atomic_read(&pkt->io_wait) > 0) | |
1119 | return; | |
1120 | ||
1121 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1122 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1123 | } else { | |
1124 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1125 | } | |
1126 | break; | |
1127 | ||
1128 | case PACKET_RECOVERY_STATE: | |
1129 | if (pkt_start_recovery(pkt)) { | |
1130 | pkt_start_write(pd, pkt); | |
1131 | } else { | |
1132 | VPRINTK("No recovery possible\n"); | |
1133 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1134 | } | |
1135 | break; | |
1136 | ||
1137 | case PACKET_FINISHED_STATE: | |
1138 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1139 | pkt_finish_packet(pkt, uptodate); | |
1140 | return; | |
1141 | ||
1142 | default: | |
1143 | BUG(); | |
1144 | break; | |
1145 | } | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1150 | { | |
1151 | struct packet_data *pkt, *next; | |
1152 | ||
1153 | VPRINTK("pkt_handle_packets\n"); | |
1154 | ||
1155 | /* | |
1156 | * Run state machine for active packets | |
1157 | */ | |
1158 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1159 | if (atomic_read(&pkt->run_sm) > 0) { | |
1160 | atomic_set(&pkt->run_sm, 0); | |
1161 | pkt_run_state_machine(pd, pkt); | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Move no longer active packets to the free list | |
1167 | */ | |
1168 | spin_lock(&pd->cdrw.active_list_lock); | |
1169 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1170 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1171 | list_del(&pkt->list); | |
1172 | pkt_put_packet_data(pd, pkt); | |
1173 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1174 | atomic_set(&pd->scan_queue, 1); | |
1175 | } | |
1176 | } | |
1177 | spin_unlock(&pd->cdrw.active_list_lock); | |
1178 | } | |
1179 | ||
1180 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1181 | { | |
1182 | struct packet_data *pkt; | |
1183 | int i; | |
1184 | ||
ae7642bb | 1185 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1186 | states[i] = 0; |
1187 | ||
1188 | spin_lock(&pd->cdrw.active_list_lock); | |
1189 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1190 | states[pkt->state]++; | |
1191 | } | |
1192 | spin_unlock(&pd->cdrw.active_list_lock); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * kcdrwd is woken up when writes have been queued for one of our | |
1197 | * registered devices | |
1198 | */ | |
1199 | static int kcdrwd(void *foobar) | |
1200 | { | |
1201 | struct pktcdvd_device *pd = foobar; | |
1202 | struct packet_data *pkt; | |
1203 | long min_sleep_time, residue; | |
1204 | ||
1205 | set_user_nice(current, -20); | |
1206 | ||
1207 | for (;;) { | |
1208 | DECLARE_WAITQUEUE(wait, current); | |
1209 | ||
1210 | /* | |
1211 | * Wait until there is something to do | |
1212 | */ | |
1213 | add_wait_queue(&pd->wqueue, &wait); | |
1214 | for (;;) { | |
1215 | set_current_state(TASK_INTERRUPTIBLE); | |
1216 | ||
1217 | /* Check if we need to run pkt_handle_queue */ | |
1218 | if (atomic_read(&pd->scan_queue) > 0) | |
1219 | goto work_to_do; | |
1220 | ||
1221 | /* Check if we need to run the state machine for some packet */ | |
1222 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1223 | if (atomic_read(&pkt->run_sm) > 0) | |
1224 | goto work_to_do; | |
1225 | } | |
1226 | ||
1227 | /* Check if we need to process the iosched queues */ | |
1228 | if (atomic_read(&pd->iosched.attention) != 0) | |
1229 | goto work_to_do; | |
1230 | ||
1231 | /* Otherwise, go to sleep */ | |
1232 | if (PACKET_DEBUG > 1) { | |
1233 | int states[PACKET_NUM_STATES]; | |
1234 | pkt_count_states(pd, states); | |
1235 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1236 | states[0], states[1], states[2], states[3], | |
1237 | states[4], states[5]); | |
1238 | } | |
1239 | ||
1240 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1241 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1242 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1243 | min_sleep_time = pkt->sleep_time; | |
1244 | } | |
1245 | ||
1246 | generic_unplug_device(bdev_get_queue(pd->bdev)); | |
1247 | ||
1248 | VPRINTK("kcdrwd: sleeping\n"); | |
1249 | residue = schedule_timeout(min_sleep_time); | |
1250 | VPRINTK("kcdrwd: wake up\n"); | |
1251 | ||
1252 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1253 | try_to_freeze(); |
1da177e4 LT |
1254 | |
1255 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1256 | if (!pkt->sleep_time) | |
1257 | continue; | |
1258 | pkt->sleep_time -= min_sleep_time - residue; | |
1259 | if (pkt->sleep_time <= 0) { | |
1260 | pkt->sleep_time = 0; | |
1261 | atomic_inc(&pkt->run_sm); | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | if (signal_pending(current)) { | |
1266 | flush_signals(current); | |
1267 | } | |
1268 | if (kthread_should_stop()) | |
1269 | break; | |
1270 | } | |
1271 | work_to_do: | |
1272 | set_current_state(TASK_RUNNING); | |
1273 | remove_wait_queue(&pd->wqueue, &wait); | |
1274 | ||
1275 | if (kthread_should_stop()) | |
1276 | break; | |
1277 | ||
1278 | /* | |
1279 | * if pkt_handle_queue returns true, we can queue | |
1280 | * another request. | |
1281 | */ | |
1282 | while (pkt_handle_queue(pd)) | |
1283 | ; | |
1284 | ||
1285 | /* | |
1286 | * Handle packet state machine | |
1287 | */ | |
1288 | pkt_handle_packets(pd); | |
1289 | ||
1290 | /* | |
1291 | * Handle iosched queues | |
1292 | */ | |
1293 | pkt_iosched_process_queue(pd); | |
1294 | } | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1300 | { | |
7822082d | 1301 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
1da177e4 LT |
1302 | printk("%u blocks, ", pd->settings.size >> 2); |
1303 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1304 | } | |
1305 | ||
1306 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1307 | { | |
1308 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1309 | ||
1310 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1311 | cgc->cmd[2] = page_code | (page_control << 6); | |
1312 | cgc->cmd[7] = cgc->buflen >> 8; | |
1313 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1314 | cgc->data_direction = CGC_DATA_READ; | |
1315 | return pkt_generic_packet(pd, cgc); | |
1316 | } | |
1317 | ||
1318 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1319 | { | |
1320 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1321 | memset(cgc->buffer, 0, 2); | |
1322 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1323 | cgc->cmd[1] = 0x10; /* PF */ | |
1324 | cgc->cmd[7] = cgc->buflen >> 8; | |
1325 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1326 | cgc->data_direction = CGC_DATA_WRITE; | |
1327 | return pkt_generic_packet(pd, cgc); | |
1328 | } | |
1329 | ||
1330 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1331 | { | |
1332 | struct packet_command cgc; | |
1333 | int ret; | |
1334 | ||
1335 | /* set up command and get the disc info */ | |
1336 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1337 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1338 | cgc.cmd[8] = cgc.buflen = 2; | |
1339 | cgc.quiet = 1; | |
1340 | ||
1341 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1342 | return ret; | |
1343 | ||
1344 | /* not all drives have the same disc_info length, so requeue | |
1345 | * packet with the length the drive tells us it can supply | |
1346 | */ | |
1347 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1348 | sizeof(di->disc_information_length); | |
1349 | ||
1350 | if (cgc.buflen > sizeof(disc_information)) | |
1351 | cgc.buflen = sizeof(disc_information); | |
1352 | ||
1353 | cgc.cmd[8] = cgc.buflen; | |
1354 | return pkt_generic_packet(pd, &cgc); | |
1355 | } | |
1356 | ||
1357 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1358 | { | |
1359 | struct packet_command cgc; | |
1360 | int ret; | |
1361 | ||
1362 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1363 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1364 | cgc.cmd[1] = type & 3; | |
1365 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1366 | cgc.cmd[5] = track & 0xff; | |
1367 | cgc.cmd[8] = 8; | |
1368 | cgc.quiet = 1; | |
1369 | ||
1370 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1371 | return ret; | |
1372 | ||
1373 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1374 | sizeof(ti->track_information_length); | |
1375 | ||
1376 | if (cgc.buflen > sizeof(track_information)) | |
1377 | cgc.buflen = sizeof(track_information); | |
1378 | ||
1379 | cgc.cmd[8] = cgc.buflen; | |
1380 | return pkt_generic_packet(pd, &cgc); | |
1381 | } | |
1382 | ||
1383 | static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written) | |
1384 | { | |
1385 | disc_information di; | |
1386 | track_information ti; | |
1387 | __u32 last_track; | |
1388 | int ret = -1; | |
1389 | ||
1390 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1391 | return ret; | |
1392 | ||
1393 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1394 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1395 | return ret; | |
1396 | ||
1397 | /* if this track is blank, try the previous. */ | |
1398 | if (ti.blank) { | |
1399 | last_track--; | |
1400 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1401 | return ret; | |
1402 | } | |
1403 | ||
1404 | /* if last recorded field is valid, return it. */ | |
1405 | if (ti.lra_v) { | |
1406 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1407 | } else { | |
1408 | /* make it up instead */ | |
1409 | *last_written = be32_to_cpu(ti.track_start) + | |
1410 | be32_to_cpu(ti.track_size); | |
1411 | if (ti.free_blocks) | |
1412 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1413 | } | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * write mode select package based on pd->settings | |
1419 | */ | |
1420 | static int pkt_set_write_settings(struct pktcdvd_device *pd) | |
1421 | { | |
1422 | struct packet_command cgc; | |
1423 | struct request_sense sense; | |
1424 | write_param_page *wp; | |
1425 | char buffer[128]; | |
1426 | int ret, size; | |
1427 | ||
1428 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1429 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1430 | return 0; | |
1431 | ||
1432 | memset(buffer, 0, sizeof(buffer)); | |
1433 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1434 | cgc.sense = &sense; | |
1435 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1436 | pkt_dump_sense(&cgc); | |
1437 | return ret; | |
1438 | } | |
1439 | ||
1440 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1441 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1442 | if (size > sizeof(buffer)) | |
1443 | size = sizeof(buffer); | |
1444 | ||
1445 | /* | |
1446 | * now get it all | |
1447 | */ | |
1448 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1449 | cgc.sense = &sense; | |
1450 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1451 | pkt_dump_sense(&cgc); | |
1452 | return ret; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * write page is offset header + block descriptor length | |
1457 | */ | |
1458 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1459 | ||
1460 | wp->fp = pd->settings.fp; | |
1461 | wp->track_mode = pd->settings.track_mode; | |
1462 | wp->write_type = pd->settings.write_type; | |
1463 | wp->data_block_type = pd->settings.block_mode; | |
1464 | ||
1465 | wp->multi_session = 0; | |
1466 | ||
1467 | #ifdef PACKET_USE_LS | |
1468 | wp->link_size = 7; | |
1469 | wp->ls_v = 1; | |
1470 | #endif | |
1471 | ||
1472 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1473 | wp->session_format = 0; | |
1474 | wp->subhdr2 = 0x20; | |
1475 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1476 | wp->session_format = 0x20; | |
1477 | wp->subhdr2 = 8; | |
1478 | #if 0 | |
1479 | wp->mcn[0] = 0x80; | |
1480 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1481 | #endif | |
1482 | } else { | |
1483 | /* | |
1484 | * paranoia | |
1485 | */ | |
7822082d | 1486 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1487 | return 1; |
1488 | } | |
1489 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1490 | ||
1491 | cgc.buflen = cgc.cmd[8] = size; | |
1492 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1493 | pkt_dump_sense(&cgc); | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | pkt_print_settings(pd); | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | /* | |
7c613d59 | 1502 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1503 | */ |
ab863ec3 | 1504 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1505 | { |
ab863ec3 PO |
1506 | switch (pd->mmc3_profile) { |
1507 | case 0x1a: /* DVD+RW */ | |
1508 | case 0x12: /* DVD-RAM */ | |
1509 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1510 | return 1; | |
1511 | default: | |
1512 | break; | |
1513 | } | |
1da177e4 | 1514 | |
ab863ec3 PO |
1515 | if (!ti->packet || !ti->fp) |
1516 | return 0; | |
1da177e4 LT |
1517 | |
1518 | /* | |
1519 | * "good" settings as per Mt Fuji. | |
1520 | */ | |
ab863ec3 | 1521 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1522 | return 1; |
1da177e4 | 1523 | |
ab863ec3 | 1524 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1525 | return 1; |
1da177e4 | 1526 | |
ab863ec3 | 1527 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1528 | return 1; |
1da177e4 | 1529 | |
7822082d | 1530 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1531 | return 0; |
1da177e4 LT |
1532 | } |
1533 | ||
1534 | /* | |
7c613d59 | 1535 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1536 | */ |
7c613d59 | 1537 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1538 | { |
1539 | switch (pd->mmc3_profile) { | |
1540 | case 0x0a: /* CD-RW */ | |
1541 | case 0xffff: /* MMC3 not supported */ | |
1542 | break; | |
1543 | case 0x1a: /* DVD+RW */ | |
1544 | case 0x13: /* DVD-RW */ | |
1545 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1546 | return 1; |
1da177e4 | 1547 | default: |
7822082d | 1548 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
7c613d59 | 1549 | return 0; |
1da177e4 LT |
1550 | } |
1551 | ||
1552 | /* | |
1553 | * for disc type 0xff we should probably reserve a new track. | |
1554 | * but i'm not sure, should we leave this to user apps? probably. | |
1555 | */ | |
1556 | if (di->disc_type == 0xff) { | |
7822082d | 1557 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
7c613d59 | 1558 | return 0; |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
7822082d | 1562 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1563 | return 0; |
1da177e4 LT |
1564 | } |
1565 | ||
1566 | if (di->erasable == 0) { | |
7822082d | 1567 | printk(DRIVER_NAME": Disc not erasable\n"); |
7c613d59 | 1568 | return 0; |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
7822082d | 1572 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
7c613d59 | 1573 | return 0; |
1da177e4 LT |
1574 | } |
1575 | ||
7c613d59 | 1576 | return 1; |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | static int pkt_probe_settings(struct pktcdvd_device *pd) | |
1580 | { | |
1581 | struct packet_command cgc; | |
1582 | unsigned char buf[12]; | |
1583 | disc_information di; | |
1584 | track_information ti; | |
1585 | int ret, track; | |
1586 | ||
1587 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1588 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1589 | cgc.cmd[8] = 8; | |
1590 | ret = pkt_generic_packet(pd, &cgc); | |
1591 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1592 | ||
1593 | memset(&di, 0, sizeof(disc_information)); | |
1594 | memset(&ti, 0, sizeof(track_information)); | |
1595 | ||
1596 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
1597 | printk("failed get_disc\n"); | |
1598 | return ret; | |
1599 | } | |
1600 | ||
7c613d59 | 1601 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1602 | return -EROFS; |
1da177e4 | 1603 | |
1da177e4 LT |
1604 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1605 | ||
1606 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1607 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
7822082d | 1608 | printk(DRIVER_NAME": failed get_track\n"); |
1da177e4 LT |
1609 | return ret; |
1610 | } | |
1611 | ||
ab863ec3 | 1612 | if (!pkt_writable_track(pd, &ti)) { |
7822082d | 1613 | printk(DRIVER_NAME": can't write to this track\n"); |
9db91546 | 1614 | return -EROFS; |
1da177e4 LT |
1615 | } |
1616 | ||
1617 | /* | |
1618 | * we keep packet size in 512 byte units, makes it easier to | |
1619 | * deal with request calculations. | |
1620 | */ | |
1621 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1622 | if (pd->settings.size == 0) { | |
7822082d | 1623 | printk(DRIVER_NAME": detected zero packet size!\n"); |
a460ad62 | 1624 | return -ENXIO; |
1da177e4 | 1625 | } |
d0272e78 | 1626 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
7822082d | 1627 | printk(DRIVER_NAME": packet size is too big\n"); |
9db91546 | 1628 | return -EROFS; |
d0272e78 | 1629 | } |
1da177e4 LT |
1630 | pd->settings.fp = ti.fp; |
1631 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1632 | ||
1633 | if (ti.nwa_v) { | |
1634 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1635 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * in theory we could use lra on -RW media as well and just zero | |
1640 | * blocks that haven't been written yet, but in practice that | |
1641 | * is just a no-go. we'll use that for -R, naturally. | |
1642 | */ | |
1643 | if (ti.lra_v) { | |
1644 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1645 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1646 | } else { | |
1647 | pd->lra = 0xffffffff; | |
1648 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * fine for now | |
1653 | */ | |
1654 | pd->settings.link_loss = 7; | |
1655 | pd->settings.write_type = 0; /* packet */ | |
1656 | pd->settings.track_mode = ti.track_mode; | |
1657 | ||
1658 | /* | |
1659 | * mode1 or mode2 disc | |
1660 | */ | |
1661 | switch (ti.data_mode) { | |
1662 | case PACKET_MODE1: | |
1663 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1664 | break; | |
1665 | case PACKET_MODE2: | |
1666 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1667 | break; | |
1668 | default: | |
7822082d | 1669 | printk(DRIVER_NAME": unknown data mode\n"); |
9db91546 | 1670 | return -EROFS; |
1da177e4 LT |
1671 | } |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * enable/disable write caching on drive | |
1677 | */ | |
1678 | static int pkt_write_caching(struct pktcdvd_device *pd, int set) | |
1679 | { | |
1680 | struct packet_command cgc; | |
1681 | struct request_sense sense; | |
1682 | unsigned char buf[64]; | |
1683 | int ret; | |
1684 | ||
1685 | memset(buf, 0, sizeof(buf)); | |
1686 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1687 | cgc.sense = &sense; | |
1688 | cgc.buflen = pd->mode_offset + 12; | |
1689 | ||
1690 | /* | |
1691 | * caching mode page might not be there, so quiet this command | |
1692 | */ | |
1693 | cgc.quiet = 1; | |
1694 | ||
1695 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1696 | return ret; | |
1697 | ||
1698 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1699 | ||
1700 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1701 | ret = pkt_mode_select(pd, &cgc); | |
1702 | if (ret) { | |
7822082d | 1703 | printk(DRIVER_NAME": write caching control failed\n"); |
1da177e4 LT |
1704 | pkt_dump_sense(&cgc); |
1705 | } else if (!ret && set) | |
7822082d | 1706 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
1da177e4 LT |
1707 | return ret; |
1708 | } | |
1709 | ||
1710 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1711 | { | |
1712 | struct packet_command cgc; | |
1713 | ||
1714 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1715 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1716 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1717 | return pkt_generic_packet(pd, &cgc); | |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * Returns drive maximum write speed | |
1722 | */ | |
1723 | static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed) | |
1724 | { | |
1725 | struct packet_command cgc; | |
1726 | struct request_sense sense; | |
1727 | unsigned char buf[256+18]; | |
1728 | unsigned char *cap_buf; | |
1729 | int ret, offset; | |
1730 | ||
1731 | memset(buf, 0, sizeof(buf)); | |
1732 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1733 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1734 | cgc.sense = &sense; | |
1735 | ||
1736 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1737 | if (ret) { | |
1738 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1739 | sizeof(struct mode_page_header); | |
1740 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1741 | if (ret) { | |
1742 | pkt_dump_sense(&cgc); | |
1743 | return ret; | |
1744 | } | |
1745 | } | |
1746 | ||
1747 | offset = 20; /* Obsoleted field, used by older drives */ | |
1748 | if (cap_buf[1] >= 28) | |
1749 | offset = 28; /* Current write speed selected */ | |
1750 | if (cap_buf[1] >= 30) { | |
1751 | /* If the drive reports at least one "Logical Unit Write | |
1752 | * Speed Performance Descriptor Block", use the information | |
1753 | * in the first block. (contains the highest speed) | |
1754 | */ | |
1755 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
1756 | if (num_spdb > 0) | |
1757 | offset = 34; | |
1758 | } | |
1759 | ||
1760 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | /* These tables from cdrecord - I don't have orange book */ | |
1765 | /* standard speed CD-RW (1-4x) */ | |
1766 | static char clv_to_speed[16] = { | |
1767 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1768 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1769 | }; | |
1770 | /* high speed CD-RW (-10x) */ | |
1771 | static char hs_clv_to_speed[16] = { | |
1772 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1773 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1774 | }; | |
1775 | /* ultra high speed CD-RW */ | |
1776 | static char us_clv_to_speed[16] = { | |
1777 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1778 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
1779 | }; | |
1780 | ||
1781 | /* | |
1782 | * reads the maximum media speed from ATIP | |
1783 | */ | |
1784 | static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed) | |
1785 | { | |
1786 | struct packet_command cgc; | |
1787 | struct request_sense sense; | |
1788 | unsigned char buf[64]; | |
1789 | unsigned int size, st, sp; | |
1790 | int ret; | |
1791 | ||
1792 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
1793 | cgc.sense = &sense; | |
1794 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
1795 | cgc.cmd[1] = 2; | |
1796 | cgc.cmd[2] = 4; /* READ ATIP */ | |
1797 | cgc.cmd[8] = 2; | |
1798 | ret = pkt_generic_packet(pd, &cgc); | |
1799 | if (ret) { | |
1800 | pkt_dump_sense(&cgc); | |
1801 | return ret; | |
1802 | } | |
1803 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
1804 | if (size > sizeof(buf)) | |
1805 | size = sizeof(buf); | |
1806 | ||
1807 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
1808 | cgc.sense = &sense; | |
1809 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
1810 | cgc.cmd[1] = 2; | |
1811 | cgc.cmd[2] = 4; | |
1812 | cgc.cmd[8] = size; | |
1813 | ret = pkt_generic_packet(pd, &cgc); | |
1814 | if (ret) { | |
1815 | pkt_dump_sense(&cgc); | |
1816 | return ret; | |
1817 | } | |
1818 | ||
1819 | if (!buf[6] & 0x40) { | |
7822082d | 1820 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
1da177e4 LT |
1821 | return 1; |
1822 | } | |
1823 | if (!buf[6] & 0x4) { | |
7822082d | 1824 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
1825 | return 1; |
1826 | } | |
1827 | ||
1828 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
1829 | ||
1830 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
1831 | ||
1832 | /* Info from cdrecord */ | |
1833 | switch (st) { | |
1834 | case 0: /* standard speed */ | |
1835 | *speed = clv_to_speed[sp]; | |
1836 | break; | |
1837 | case 1: /* high speed */ | |
1838 | *speed = hs_clv_to_speed[sp]; | |
1839 | break; | |
1840 | case 2: /* ultra high speed */ | |
1841 | *speed = us_clv_to_speed[sp]; | |
1842 | break; | |
1843 | default: | |
7822082d | 1844 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
1da177e4 LT |
1845 | return 1; |
1846 | } | |
1847 | if (*speed) { | |
7822082d | 1848 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
1da177e4 LT |
1849 | return 0; |
1850 | } else { | |
7822082d | 1851 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
1da177e4 LT |
1852 | return 1; |
1853 | } | |
1854 | } | |
1855 | ||
1856 | static int pkt_perform_opc(struct pktcdvd_device *pd) | |
1857 | { | |
1858 | struct packet_command cgc; | |
1859 | struct request_sense sense; | |
1860 | int ret; | |
1861 | ||
7822082d | 1862 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
1da177e4 LT |
1863 | |
1864 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1865 | cgc.sense = &sense; | |
1866 | cgc.timeout = 60*HZ; | |
1867 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
1868 | cgc.cmd[1] = 1; | |
1869 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1870 | pkt_dump_sense(&cgc); | |
1871 | return ret; | |
1872 | } | |
1873 | ||
1874 | static int pkt_open_write(struct pktcdvd_device *pd) | |
1875 | { | |
1876 | int ret; | |
1877 | unsigned int write_speed, media_write_speed, read_speed; | |
1878 | ||
1879 | if ((ret = pkt_probe_settings(pd))) { | |
7822082d | 1880 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
9db91546 | 1881 | return ret; |
1da177e4 LT |
1882 | } |
1883 | ||
1884 | if ((ret = pkt_set_write_settings(pd))) { | |
7822082d | 1885 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
1da177e4 LT |
1886 | return -EIO; |
1887 | } | |
1888 | ||
1889 | pkt_write_caching(pd, USE_WCACHING); | |
1890 | ||
1891 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
1892 | write_speed = 16 * 177; | |
1893 | switch (pd->mmc3_profile) { | |
1894 | case 0x13: /* DVD-RW */ | |
1895 | case 0x1a: /* DVD+RW */ | |
1896 | case 0x12: /* DVD-RAM */ | |
7822082d | 1897 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
1da177e4 LT |
1898 | break; |
1899 | default: | |
1900 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
1901 | media_write_speed = 16; | |
1902 | write_speed = min(write_speed, media_write_speed * 177); | |
7822082d | 1903 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
1da177e4 LT |
1904 | break; |
1905 | } | |
1906 | read_speed = write_speed; | |
1907 | ||
1908 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
7822082d | 1909 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
1da177e4 LT |
1910 | return -EIO; |
1911 | } | |
1912 | pd->write_speed = write_speed; | |
1913 | pd->read_speed = read_speed; | |
1914 | ||
1915 | if ((ret = pkt_perform_opc(pd))) { | |
7822082d | 1916 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | return 0; | |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * called at open time. | |
1924 | */ | |
1925 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) | |
1926 | { | |
1927 | int ret; | |
1928 | long lba; | |
1929 | request_queue_t *q; | |
1930 | ||
1931 | /* | |
1932 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
1933 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
1934 | * so bdget() can't fail. | |
1935 | */ | |
1936 | bdget(pd->bdev->bd_dev); | |
1937 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) | |
1938 | goto out; | |
1939 | ||
8382bf2e PO |
1940 | if ((ret = bd_claim(pd->bdev, pd))) |
1941 | goto out_putdev; | |
1942 | ||
1da177e4 | 1943 | if ((ret = pkt_get_last_written(pd, &lba))) { |
7822082d | 1944 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
8382bf2e | 1945 | goto out_unclaim; |
1da177e4 LT |
1946 | } |
1947 | ||
1948 | set_capacity(pd->disk, lba << 2); | |
1949 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
1950 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
1951 | ||
1952 | q = bdev_get_queue(pd->bdev); | |
1953 | if (write) { | |
1954 | if ((ret = pkt_open_write(pd))) | |
8382bf2e | 1955 | goto out_unclaim; |
1da177e4 LT |
1956 | /* |
1957 | * Some CDRW drives can not handle writes larger than one packet, | |
1958 | * even if the size is a multiple of the packet size. | |
1959 | */ | |
1960 | spin_lock_irq(q->queue_lock); | |
1961 | blk_queue_max_sectors(q, pd->settings.size); | |
1962 | spin_unlock_irq(q->queue_lock); | |
1963 | set_bit(PACKET_WRITABLE, &pd->flags); | |
1964 | } else { | |
1965 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
1966 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
1967 | } | |
1968 | ||
1969 | if ((ret = pkt_set_segment_merging(pd, q))) | |
8382bf2e | 1970 | goto out_unclaim; |
1da177e4 | 1971 | |
e1bc89bc PO |
1972 | if (write) { |
1973 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
7822082d | 1974 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
e1bc89bc PO |
1975 | ret = -ENOMEM; |
1976 | goto out_unclaim; | |
1977 | } | |
7822082d | 1978 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
e1bc89bc | 1979 | } |
1da177e4 LT |
1980 | |
1981 | return 0; | |
1982 | ||
8382bf2e PO |
1983 | out_unclaim: |
1984 | bd_release(pd->bdev); | |
1da177e4 LT |
1985 | out_putdev: |
1986 | blkdev_put(pd->bdev); | |
1987 | out: | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | /* | |
1992 | * called when the device is closed. makes sure that the device flushes | |
1993 | * the internal cache before we close. | |
1994 | */ | |
1995 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
1996 | { | |
1997 | if (flush && pkt_flush_cache(pd)) | |
7822082d | 1998 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
1da177e4 LT |
1999 | |
2000 | pkt_lock_door(pd, 0); | |
2001 | ||
2002 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
8382bf2e | 2003 | bd_release(pd->bdev); |
1da177e4 | 2004 | blkdev_put(pd->bdev); |
e1bc89bc PO |
2005 | |
2006 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2007 | } |
2008 | ||
2009 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) | |
2010 | { | |
2011 | if (dev_minor >= MAX_WRITERS) | |
2012 | return NULL; | |
2013 | return pkt_devs[dev_minor]; | |
2014 | } | |
2015 | ||
2016 | static int pkt_open(struct inode *inode, struct file *file) | |
2017 | { | |
2018 | struct pktcdvd_device *pd = NULL; | |
2019 | int ret; | |
2020 | ||
7822082d | 2021 | VPRINTK(DRIVER_NAME": entering open\n"); |
1da177e4 | 2022 | |
1657f824 | 2023 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2024 | pd = pkt_find_dev_from_minor(iminor(inode)); |
2025 | if (!pd) { | |
2026 | ret = -ENODEV; | |
2027 | goto out; | |
2028 | } | |
2029 | BUG_ON(pd->refcnt < 0); | |
2030 | ||
2031 | pd->refcnt++; | |
46f4e1b7 PO |
2032 | if (pd->refcnt > 1) { |
2033 | if ((file->f_mode & FMODE_WRITE) && | |
2034 | !test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2035 | ret = -EBUSY; | |
2036 | goto out_dec; | |
2037 | } | |
2038 | } else { | |
01fd9fda PO |
2039 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); |
2040 | if (ret) | |
1da177e4 | 2041 | goto out_dec; |
1da177e4 LT |
2042 | /* |
2043 | * needed here as well, since ext2 (among others) may change | |
2044 | * the blocksize at mount time | |
2045 | */ | |
2046 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); | |
2047 | } | |
2048 | ||
1657f824 | 2049 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2050 | return 0; |
2051 | ||
2052 | out_dec: | |
2053 | pd->refcnt--; | |
2054 | out: | |
7822082d | 2055 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
1657f824 | 2056 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2057 | return ret; |
2058 | } | |
2059 | ||
2060 | static int pkt_close(struct inode *inode, struct file *file) | |
2061 | { | |
2062 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2063 | int ret = 0; | |
2064 | ||
1657f824 | 2065 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2066 | pd->refcnt--; |
2067 | BUG_ON(pd->refcnt < 0); | |
2068 | if (pd->refcnt == 0) { | |
2069 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2070 | pkt_release_dev(pd, flush); | |
2071 | } | |
1657f824 | 2072 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2073 | return ret; |
2074 | } | |
2075 | ||
2076 | ||
1da177e4 LT |
2077 | static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err) |
2078 | { | |
2079 | struct packet_stacked_data *psd = bio->bi_private; | |
2080 | struct pktcdvd_device *pd = psd->pd; | |
2081 | ||
2082 | if (bio->bi_size) | |
2083 | return 1; | |
2084 | ||
2085 | bio_put(bio); | |
2086 | bio_endio(psd->bio, psd->bio->bi_size, err); | |
2087 | mempool_free(psd, psd_pool); | |
2088 | pkt_bio_finished(pd); | |
2089 | return 0; | |
2090 | } | |
2091 | ||
2092 | static int pkt_make_request(request_queue_t *q, struct bio *bio) | |
2093 | { | |
2094 | struct pktcdvd_device *pd; | |
2095 | char b[BDEVNAME_SIZE]; | |
2096 | sector_t zone; | |
2097 | struct packet_data *pkt; | |
2098 | int was_empty, blocked_bio; | |
2099 | struct pkt_rb_node *node; | |
2100 | ||
2101 | pd = q->queuedata; | |
2102 | if (!pd) { | |
7822082d | 2103 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
1da177e4 LT |
2104 | goto end_io; |
2105 | } | |
2106 | ||
2107 | /* | |
2108 | * Clone READ bios so we can have our own bi_end_io callback. | |
2109 | */ | |
2110 | if (bio_data_dir(bio) == READ) { | |
2111 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2112 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2113 | ||
2114 | psd->pd = pd; | |
2115 | psd->bio = bio; | |
2116 | cloned_bio->bi_bdev = pd->bdev; | |
2117 | cloned_bio->bi_private = psd; | |
2118 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2119 | pd->stats.secs_r += bio->bi_size >> 9; | |
46c271be | 2120 | pkt_queue_bio(pd, cloned_bio); |
1da177e4 LT |
2121 | return 0; |
2122 | } | |
2123 | ||
2124 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
7822082d | 2125 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
1da177e4 LT |
2126 | pd->name, (unsigned long long)bio->bi_sector); |
2127 | goto end_io; | |
2128 | } | |
2129 | ||
2130 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
7822082d | 2131 | printk(DRIVER_NAME": wrong bio size\n"); |
1da177e4 LT |
2132 | goto end_io; |
2133 | } | |
2134 | ||
2135 | blk_queue_bounce(q, &bio); | |
2136 | ||
2137 | zone = ZONE(bio->bi_sector, pd); | |
2138 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2139 | (unsigned long long)bio->bi_sector, | |
2140 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2141 | ||
2142 | /* Check if we have to split the bio */ | |
2143 | { | |
2144 | struct bio_pair *bp; | |
2145 | sector_t last_zone; | |
2146 | int first_sectors; | |
2147 | ||
2148 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2149 | if (last_zone != zone) { | |
2150 | BUG_ON(last_zone != zone + pd->settings.size); | |
2151 | first_sectors = last_zone - bio->bi_sector; | |
2152 | bp = bio_split(bio, bio_split_pool, first_sectors); | |
2153 | BUG_ON(!bp); | |
2154 | pkt_make_request(q, &bp->bio1); | |
2155 | pkt_make_request(q, &bp->bio2); | |
2156 | bio_pair_release(bp); | |
2157 | return 0; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2163 | * just append this bio to that packet. | |
2164 | */ | |
2165 | spin_lock(&pd->cdrw.active_list_lock); | |
2166 | blocked_bio = 0; | |
2167 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2168 | if (pkt->sector == zone) { | |
2169 | spin_lock(&pkt->lock); | |
2170 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2171 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2172 | pkt_add_list_last(bio, &pkt->orig_bios, | |
2173 | &pkt->orig_bios_tail); | |
2174 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
2175 | if ((pkt->write_size >= pkt->frames) && | |
2176 | (pkt->state == PACKET_WAITING_STATE)) { | |
2177 | atomic_inc(&pkt->run_sm); | |
2178 | wake_up(&pd->wqueue); | |
2179 | } | |
2180 | spin_unlock(&pkt->lock); | |
2181 | spin_unlock(&pd->cdrw.active_list_lock); | |
2182 | return 0; | |
2183 | } else { | |
2184 | blocked_bio = 1; | |
2185 | } | |
2186 | spin_unlock(&pkt->lock); | |
2187 | } | |
2188 | } | |
2189 | spin_unlock(&pd->cdrw.active_list_lock); | |
2190 | ||
0a0fc960 TM |
2191 | /* |
2192 | * Test if there is enough room left in the bio work queue | |
2193 | * (queue size >= congestion on mark). | |
2194 | * If not, wait till the work queue size is below the congestion off mark. | |
2195 | */ | |
2196 | spin_lock(&pd->lock); | |
2197 | if (pd->write_congestion_on > 0 | |
2198 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
2199 | blk_set_queue_congested(q, WRITE); | |
2200 | do { | |
2201 | spin_unlock(&pd->lock); | |
2202 | congestion_wait(WRITE, HZ); | |
2203 | spin_lock(&pd->lock); | |
2204 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2205 | } | |
2206 | spin_unlock(&pd->lock); | |
2207 | ||
1da177e4 LT |
2208 | /* |
2209 | * No matching packet found. Store the bio in the work queue. | |
2210 | */ | |
2211 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2212 | node->bio = bio; |
2213 | spin_lock(&pd->lock); | |
2214 | BUG_ON(pd->bio_queue_size < 0); | |
2215 | was_empty = (pd->bio_queue_size == 0); | |
2216 | pkt_rbtree_insert(pd, node); | |
2217 | spin_unlock(&pd->lock); | |
2218 | ||
2219 | /* | |
2220 | * Wake up the worker thread. | |
2221 | */ | |
2222 | atomic_set(&pd->scan_queue, 1); | |
2223 | if (was_empty) { | |
2224 | /* This wake_up is required for correct operation */ | |
2225 | wake_up(&pd->wqueue); | |
2226 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2227 | /* | |
2228 | * This wake up is not required for correct operation, | |
2229 | * but improves performance in some cases. | |
2230 | */ | |
2231 | wake_up(&pd->wqueue); | |
2232 | } | |
2233 | return 0; | |
2234 | end_io: | |
2235 | bio_io_error(bio, bio->bi_size); | |
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | ||
2240 | ||
2241 | static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec) | |
2242 | { | |
2243 | struct pktcdvd_device *pd = q->queuedata; | |
2244 | sector_t zone = ZONE(bio->bi_sector, pd); | |
2245 | int used = ((bio->bi_sector - zone) << 9) + bio->bi_size; | |
2246 | int remaining = (pd->settings.size << 9) - used; | |
2247 | int remaining2; | |
2248 | ||
2249 | /* | |
2250 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2251 | * boundary, pkt_make_request() will split the bio. | |
2252 | */ | |
2253 | remaining2 = PAGE_SIZE - bio->bi_size; | |
2254 | remaining = max(remaining, remaining2); | |
2255 | ||
2256 | BUG_ON(remaining < 0); | |
2257 | return remaining; | |
2258 | } | |
2259 | ||
2260 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2261 | { | |
2262 | request_queue_t *q = pd->disk->queue; | |
2263 | ||
2264 | blk_queue_make_request(q, pkt_make_request); | |
2265 | blk_queue_hardsect_size(q, CD_FRAMESIZE); | |
2266 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); | |
2267 | blk_queue_merge_bvec(q, pkt_merge_bvec); | |
2268 | q->queuedata = pd; | |
2269 | } | |
2270 | ||
2271 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2272 | { | |
2273 | struct pktcdvd_device *pd = m->private; | |
2274 | char *msg; | |
2275 | char bdev_buf[BDEVNAME_SIZE]; | |
2276 | int states[PACKET_NUM_STATES]; | |
2277 | ||
2278 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2279 | bdevname(pd->bdev, bdev_buf)); | |
2280 | ||
2281 | seq_printf(m, "\nSettings:\n"); | |
2282 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2283 | ||
2284 | if (pd->settings.write_type == 0) | |
2285 | msg = "Packet"; | |
2286 | else | |
2287 | msg = "Unknown"; | |
2288 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2289 | ||
2290 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2291 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2292 | ||
2293 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2294 | ||
2295 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2296 | msg = "Mode 1"; | |
2297 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2298 | msg = "Mode 2"; | |
2299 | else | |
2300 | msg = "Unknown"; | |
2301 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2302 | ||
2303 | seq_printf(m, "\nStatistics:\n"); | |
2304 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2305 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2306 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2307 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2308 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2309 | ||
2310 | seq_printf(m, "\nMisc:\n"); | |
2311 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2312 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2313 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2314 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2315 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2316 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2317 | ||
2318 | seq_printf(m, "\nQueue state:\n"); | |
2319 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2320 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2321 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2322 | ||
2323 | pkt_count_states(pd, states); | |
2324 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2325 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2326 | ||
0a0fc960 TM |
2327 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2328 | pd->write_congestion_off, | |
2329 | pd->write_congestion_on); | |
1da177e4 LT |
2330 | return 0; |
2331 | } | |
2332 | ||
2333 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2334 | { | |
2335 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2336 | } | |
2337 | ||
2338 | static struct file_operations pkt_proc_fops = { | |
2339 | .open = pkt_seq_open, | |
2340 | .read = seq_read, | |
2341 | .llseek = seq_lseek, | |
2342 | .release = single_release | |
2343 | }; | |
2344 | ||
2345 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2346 | { | |
2347 | int i; | |
2348 | int ret = 0; | |
2349 | char b[BDEVNAME_SIZE]; | |
2350 | struct proc_dir_entry *proc; | |
2351 | struct block_device *bdev; | |
2352 | ||
2353 | if (pd->pkt_dev == dev) { | |
7822082d | 2354 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
1da177e4 LT |
2355 | return -EBUSY; |
2356 | } | |
2357 | for (i = 0; i < MAX_WRITERS; i++) { | |
2358 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2359 | if (!pd2) | |
2360 | continue; | |
2361 | if (pd2->bdev->bd_dev == dev) { | |
7822082d | 2362 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
1da177e4 LT |
2363 | return -EBUSY; |
2364 | } | |
2365 | if (pd2->pkt_dev == dev) { | |
7822082d | 2366 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
1da177e4 LT |
2367 | return -EBUSY; |
2368 | } | |
2369 | } | |
2370 | ||
2371 | bdev = bdget(dev); | |
2372 | if (!bdev) | |
2373 | return -ENOMEM; | |
2374 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); | |
2375 | if (ret) | |
2376 | return ret; | |
2377 | ||
2378 | /* This is safe, since we have a reference from open(). */ | |
2379 | __module_get(THIS_MODULE); | |
2380 | ||
1da177e4 LT |
2381 | pd->bdev = bdev; |
2382 | set_blocksize(bdev, CD_FRAMESIZE); | |
2383 | ||
2384 | pkt_init_queue(pd); | |
2385 | ||
2386 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2387 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2388 | if (IS_ERR(pd->cdrw.thread)) { | |
7822082d | 2389 | printk(DRIVER_NAME": can't start kernel thread\n"); |
1da177e4 | 2390 | ret = -ENOMEM; |
e1bc89bc | 2391 | goto out_mem; |
1da177e4 LT |
2392 | } |
2393 | ||
2394 | proc = create_proc_entry(pd->name, 0, pkt_proc); | |
2395 | if (proc) { | |
2396 | proc->data = pd; | |
2397 | proc->proc_fops = &pkt_proc_fops; | |
2398 | } | |
7822082d | 2399 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
1da177e4 LT |
2400 | return 0; |
2401 | ||
1da177e4 LT |
2402 | out_mem: |
2403 | blkdev_put(bdev); | |
2404 | /* This is safe: open() is still holding a reference. */ | |
2405 | module_put(THIS_MODULE); | |
2406 | return ret; | |
2407 | } | |
2408 | ||
2409 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2410 | { | |
2411 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2412 | ||
2413 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); | |
1da177e4 LT |
2414 | |
2415 | switch (cmd) { | |
2416 | /* | |
2417 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2418 | */ | |
2419 | case CDROMMULTISESSION: | |
2420 | case CDROMREADTOCENTRY: | |
2421 | case CDROM_LAST_WRITTEN: | |
2422 | case CDROM_SEND_PACKET: | |
2423 | case SCSI_IOCTL_SEND_COMMAND: | |
118326e9 | 2424 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2425 | |
2426 | case CDROMEJECT: | |
2427 | /* | |
2428 | * The door gets locked when the device is opened, so we | |
2429 | * have to unlock it or else the eject command fails. | |
2430 | */ | |
948423e5 PO |
2431 | if (pd->refcnt == 1) |
2432 | pkt_lock_door(pd, 0); | |
118326e9 | 2433 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2434 | |
2435 | default: | |
7822082d | 2436 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
1da177e4 LT |
2437 | return -ENOTTY; |
2438 | } | |
2439 | ||
2440 | return 0; | |
2441 | } | |
2442 | ||
2443 | static int pkt_media_changed(struct gendisk *disk) | |
2444 | { | |
2445 | struct pktcdvd_device *pd = disk->private_data; | |
2446 | struct gendisk *attached_disk; | |
2447 | ||
2448 | if (!pd) | |
2449 | return 0; | |
2450 | if (!pd->bdev) | |
2451 | return 0; | |
2452 | attached_disk = pd->bdev->bd_disk; | |
2453 | if (!attached_disk) | |
2454 | return 0; | |
2455 | return attached_disk->fops->media_changed(attached_disk); | |
2456 | } | |
2457 | ||
2458 | static struct block_device_operations pktcdvd_ops = { | |
2459 | .owner = THIS_MODULE, | |
2460 | .open = pkt_open, | |
2461 | .release = pkt_close, | |
2462 | .ioctl = pkt_ioctl, | |
2463 | .media_changed = pkt_media_changed, | |
2464 | }; | |
2465 | ||
2466 | /* | |
2467 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2468 | */ | |
adb9250a | 2469 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2470 | { |
2471 | int idx; | |
2472 | int ret = -ENOMEM; | |
2473 | struct pktcdvd_device *pd; | |
2474 | struct gendisk *disk; | |
adb9250a TM |
2475 | |
2476 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2477 | |
2478 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2479 | if (!pkt_devs[idx]) | |
2480 | break; | |
2481 | if (idx == MAX_WRITERS) { | |
7822082d | 2482 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2483 | ret = -EBUSY; |
2484 | goto out_mutex; | |
1da177e4 LT |
2485 | } |
2486 | ||
1107d2e0 | 2487 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2488 | if (!pd) |
adb9250a | 2489 | goto out_mutex; |
1da177e4 | 2490 | |
0eaae62a MD |
2491 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2492 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2493 | if (!pd->rb_pool) |
2494 | goto out_mem; | |
2495 | ||
e1bc89bc PO |
2496 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2497 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2498 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2499 | ||
1da177e4 LT |
2500 | spin_lock_init(&pd->lock); |
2501 | spin_lock_init(&pd->iosched.lock); | |
7822082d | 2502 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2503 | init_waitqueue_head(&pd->wqueue); |
2504 | pd->bio_queue = RB_ROOT; | |
2505 | ||
0a0fc960 TM |
2506 | pd->write_congestion_on = write_congestion_on; |
2507 | pd->write_congestion_off = write_congestion_off; | |
2508 | ||
adb9250a TM |
2509 | disk = alloc_disk(1); |
2510 | if (!disk) | |
2511 | goto out_mem; | |
2512 | pd->disk = disk; | |
add21660 | 2513 | disk->major = pktdev_major; |
1da177e4 LT |
2514 | disk->first_minor = idx; |
2515 | disk->fops = &pktcdvd_ops; | |
2516 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2517 | strcpy(disk->disk_name, pd->name); |
1da177e4 LT |
2518 | disk->private_data = pd; |
2519 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2520 | if (!disk->queue) | |
2521 | goto out_mem2; | |
2522 | ||
2523 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); | |
2524 | ret = pkt_new_dev(pd, dev); | |
2525 | if (ret) | |
2526 | goto out_new_dev; | |
2527 | ||
2528 | add_disk(disk); | |
adb9250a | 2529 | |
1da177e4 | 2530 | pkt_devs[idx] = pd; |
adb9250a TM |
2531 | if (pkt_dev) |
2532 | *pkt_dev = pd->pkt_dev; | |
2533 | ||
2534 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2535 | return 0; |
2536 | ||
2537 | out_new_dev: | |
1312f40e | 2538 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2539 | out_mem2: |
2540 | put_disk(disk); | |
2541 | out_mem: | |
2542 | if (pd->rb_pool) | |
2543 | mempool_destroy(pd->rb_pool); | |
2544 | kfree(pd); | |
adb9250a TM |
2545 | out_mutex: |
2546 | mutex_unlock(&ctl_mutex); | |
2547 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); | |
1da177e4 LT |
2548 | return ret; |
2549 | } | |
2550 | ||
2551 | /* | |
2552 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2553 | */ | |
adb9250a | 2554 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2555 | { |
2556 | struct pktcdvd_device *pd; | |
2557 | int idx; | |
adb9250a TM |
2558 | int ret = 0; |
2559 | ||
2560 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2561 | |
2562 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2563 | pd = pkt_devs[idx]; | |
2564 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2565 | break; | |
2566 | } | |
2567 | if (idx == MAX_WRITERS) { | |
7822082d | 2568 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
adb9250a TM |
2569 | ret = -ENXIO; |
2570 | goto out; | |
1da177e4 LT |
2571 | } |
2572 | ||
adb9250a TM |
2573 | if (pd->refcnt > 0) { |
2574 | ret = -EBUSY; | |
2575 | goto out; | |
2576 | } | |
1da177e4 LT |
2577 | if (!IS_ERR(pd->cdrw.thread)) |
2578 | kthread_stop(pd->cdrw.thread); | |
2579 | ||
2580 | blkdev_put(pd->bdev); | |
2581 | ||
1da177e4 | 2582 | remove_proc_entry(pd->name, pkt_proc); |
7822082d | 2583 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
1da177e4 LT |
2584 | |
2585 | del_gendisk(pd->disk); | |
1312f40e | 2586 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2587 | put_disk(pd->disk); |
2588 | ||
2589 | pkt_devs[idx] = NULL; | |
2590 | mempool_destroy(pd->rb_pool); | |
2591 | kfree(pd); | |
2592 | ||
2593 | /* This is safe: open() is still holding a reference. */ | |
2594 | module_put(THIS_MODULE); | |
adb9250a TM |
2595 | |
2596 | out: | |
2597 | mutex_unlock(&ctl_mutex); | |
2598 | return ret; | |
1da177e4 LT |
2599 | } |
2600 | ||
2601 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2602 | { | |
adb9250a TM |
2603 | struct pktcdvd_device *pd; |
2604 | ||
2605 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2606 | ||
2607 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2608 | if (pd) { |
2609 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2610 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2611 | } else { | |
2612 | ctrl_cmd->dev = 0; | |
2613 | ctrl_cmd->pkt_dev = 0; | |
2614 | } | |
2615 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2616 | |
2617 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2618 | } |
2619 | ||
2620 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2621 | { | |
2622 | void __user *argp = (void __user *)arg; | |
2623 | struct pkt_ctrl_command ctrl_cmd; | |
2624 | int ret = 0; | |
adb9250a | 2625 | dev_t pkt_dev = 0; |
1da177e4 LT |
2626 | |
2627 | if (cmd != PACKET_CTRL_CMD) | |
2628 | return -ENOTTY; | |
2629 | ||
2630 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2631 | return -EFAULT; | |
2632 | ||
2633 | switch (ctrl_cmd.command) { | |
2634 | case PKT_CTRL_CMD_SETUP: | |
2635 | if (!capable(CAP_SYS_ADMIN)) | |
2636 | return -EPERM; | |
adb9250a TM |
2637 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2638 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2639 | break; |
2640 | case PKT_CTRL_CMD_TEARDOWN: | |
2641 | if (!capable(CAP_SYS_ADMIN)) | |
2642 | return -EPERM; | |
adb9250a | 2643 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2644 | break; |
2645 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2646 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2647 | break; |
2648 | default: | |
2649 | return -ENOTTY; | |
2650 | } | |
2651 | ||
2652 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2653 | return -EFAULT; | |
2654 | return ret; | |
2655 | } | |
2656 | ||
2657 | ||
2658 | static struct file_operations pkt_ctl_fops = { | |
2659 | .ioctl = pkt_ctl_ioctl, | |
2660 | .owner = THIS_MODULE, | |
2661 | }; | |
2662 | ||
2663 | static struct miscdevice pkt_misc = { | |
2664 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2665 | .name = DRIVER_NAME, |
1da177e4 LT |
2666 | .fops = &pkt_ctl_fops |
2667 | }; | |
2668 | ||
2669 | static int __init pkt_init(void) | |
2670 | { | |
2671 | int ret; | |
2672 | ||
0eaae62a MD |
2673 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
2674 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
2675 | if (!psd_pool) |
2676 | return -ENOMEM; | |
2677 | ||
add21660 | 2678 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2679 | if (ret < 0) { |
7822082d | 2680 | printk(DRIVER_NAME": Unable to register block device\n"); |
1da177e4 LT |
2681 | goto out2; |
2682 | } | |
add21660 TM |
2683 | if (!pktdev_major) |
2684 | pktdev_major = ret; | |
1da177e4 LT |
2685 | |
2686 | ret = misc_register(&pkt_misc); | |
2687 | if (ret) { | |
7822082d | 2688 | printk(DRIVER_NAME": Unable to register misc device\n"); |
1da177e4 LT |
2689 | goto out; |
2690 | } | |
2691 | ||
1657f824 | 2692 | mutex_init(&ctl_mutex); |
1da177e4 | 2693 | |
7822082d | 2694 | pkt_proc = proc_mkdir(DRIVER_NAME, proc_root_driver); |
1da177e4 | 2695 | |
1da177e4 LT |
2696 | return 0; |
2697 | ||
2698 | out: | |
add21660 | 2699 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
2700 | out2: |
2701 | mempool_destroy(psd_pool); | |
2702 | return ret; | |
2703 | } | |
2704 | ||
2705 | static void __exit pkt_exit(void) | |
2706 | { | |
7822082d | 2707 | remove_proc_entry(DRIVER_NAME, proc_root_driver); |
1da177e4 | 2708 | misc_deregister(&pkt_misc); |
add21660 | 2709 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
2710 | mempool_destroy(psd_pool); |
2711 | } | |
2712 | ||
2713 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
2714 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
2715 | MODULE_LICENSE("GPL"); | |
2716 | ||
2717 | module_init(pkt_init); | |
2718 | module_exit(pkt_exit); |