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[mirror_ubuntu-artful-kernel.git] / drivers / block / pktcdvd.c
CommitLineData
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
99481334
JP		 47#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48
1da177e4 49#include <linux/pktcdvd.h>
1da177e4
LT		 50#include <linux/module.h>
51#include <linux/types.h>
52#include <linux/kernel.h>
f80a0ca6 53#include <linux/compat.h>
1da177e4
LT		 54#include <linux/kthread.h>
55#include <linux/errno.h>
56#include <linux/spinlock.h>
57#include <linux/file.h>
58#include <linux/proc_fs.h>
59#include <linux/seq_file.h>
60#include <linux/miscdevice.h>
7dfb7103 61#include <linux/freezer.h>
1657f824 62#include <linux/mutex.h>
5a0e3ad6 63#include <linux/slab.h>
66114cad 64#include <linux/backing-dev.h>
1da177e4
LT		 65#include <scsi/scsi_cmnd.h>
66#include <scsi/scsi_ioctl.h>
cef28963 67#include <scsi/scsi.h>
32694850
TM		 68#include <linux/debugfs.h>
69#include <linux/device.h>
1da177e4 70
7c0f6ba6 71#include <linux/uaccess.h>
1da177e4 72
7822082d
TM		 73#define DRIVER_NAME "pktcdvd"
74
fa63c0ab
JP		 75#define pkt_err(pd, fmt, ...) \
76 pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
ca73dabc
JP		 77#define pkt_notice(pd, fmt, ...) \
78 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
0c075d64
JP		 79#define pkt_info(pd, fmt, ...) \
80 pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
fa63c0ab 81
844aa797
JP		 82#define pkt_dbg(level, pd, fmt, ...) \
83do { \
84 if (level == 2 && PACKET_DEBUG >= 2) \
85 pr_notice("%s: %s():" fmt, \
86 pd->name, __func__, ##__VA_ARGS__); \
87 else if (level == 1 && PACKET_DEBUG >= 1) \
88 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \
cd3f2cd0 89} while (0)
1da177e4
LT		 90
91#define MAX_SPEED 0xffff
92
2a48fc0a 93static DEFINE_MUTEX(pktcdvd_mutex);
1da177e4
LT		 94static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
95static struct proc_dir_entry *pkt_proc;
add21660 96static int pktdev_major;
0a0fc960
TM		 97static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
98static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
1657f824 99static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
1da177e4 100static mempool_t *psd_pool;
a1d91404 101static struct bio_set *pkt_bio_set;
1da177e4 102
32694850 103static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
ea5ffff5 104static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
32694850
TM		 105
106/* forward declaration */
107static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
108static int pkt_remove_dev(dev_t pkt_dev);
109static int pkt_seq_show(struct seq_file *m, void *p);
110
5323fb77
JP		 111static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
112{
113 return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
114}
32694850
TM		 115
116/*
117 * create and register a pktcdvd kernel object.
118 */
119static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
120 const char* name,
121 struct kobject* parent,
122 struct kobj_type* ktype)
123{
124 struct pktcdvd_kobj *p;
89c42606
GKH		 125 int error;
126
32694850
TM		 127 p = kzalloc(sizeof(*p), GFP_KERNEL);
128 if (!p)
129 return NULL;
32694850 130 p->pd = pd;
89c42606
GKH		 131 error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
132 if (error) {
d17a18dd 133 kobject_put(&p->kobj);
32694850 134 return NULL;
d17a18dd 135 }
89c42606 136 kobject_uevent(&p->kobj, KOBJ_ADD);
32694850
TM		 137 return p;
138}
139/*
140 * remove a pktcdvd kernel object.
141 */
142static void pkt_kobj_remove(struct pktcdvd_kobj *p)
143{
144 if (p)
c10997f6 145 kobject_put(&p->kobj);
32694850
TM		 146}
147/*
148 * default release function for pktcdvd kernel objects.
149 */
150static void pkt_kobj_release(struct kobject *kobj)
151{
152 kfree(to_pktcdvdkobj(kobj));
153}
154
155
156/**********************************************************
157 *
158 * sysfs interface for pktcdvd
159 * by (C) 2006 Thomas Maier <balagi@justmail.de>
160 *
161 **********************************************************/
162
163#define DEF_ATTR(_obj,_name,_mode) \
7b595756 164 static struct attribute _obj = { .name = _name, .mode = _mode }
32694850
TM		 165
166/**********************************************************
167 /sys/class/pktcdvd/pktcdvd[0-7]/
168 stat/reset
169 stat/packets_started
170 stat/packets_finished
171 stat/kb_written
172 stat/kb_read
173 stat/kb_read_gather
174 write_queue/size
175 write_queue/congestion_off
176 write_queue/congestion_on
177 **********************************************************/
178
179DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
180DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
181DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
182DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
183DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
184DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
185
186static struct attribute *kobj_pkt_attrs_stat[] = {
187 &kobj_pkt_attr_st1,
188 &kobj_pkt_attr_st2,
189 &kobj_pkt_attr_st3,
190 &kobj_pkt_attr_st4,
191 &kobj_pkt_attr_st5,
192 &kobj_pkt_attr_st6,
193 NULL
194};
195
196DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
197DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
198DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
199
200static struct attribute *kobj_pkt_attrs_wqueue[] = {
201 &kobj_pkt_attr_wq1,
202 &kobj_pkt_attr_wq2,
203 &kobj_pkt_attr_wq3,
204 NULL
205};
206
32694850
TM		 207static ssize_t kobj_pkt_show(struct kobject *kobj,
208 struct attribute *attr, char *data)
209{
210 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
211 int n = 0;
212 int v;
213 if (strcmp(attr->name, "packets_started") == 0) {
214 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
215
216 } else if (strcmp(attr->name, "packets_finished") == 0) {
217 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
218
219 } else if (strcmp(attr->name, "kb_written") == 0) {
220 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
221
222 } else if (strcmp(attr->name, "kb_read") == 0) {
223 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
224
225 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
226 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
227
228 } else if (strcmp(attr->name, "size") == 0) {
229 spin_lock(&pd->lock);
230 v = pd->bio_queue_size;
231 spin_unlock(&pd->lock);
232 n = sprintf(data, "%d\n", v);
233
234 } else if (strcmp(attr->name, "congestion_off") == 0) {
235 spin_lock(&pd->lock);
236 v = pd->write_congestion_off;
237 spin_unlock(&pd->lock);
238 n = sprintf(data, "%d\n", v);
239
240 } else if (strcmp(attr->name, "congestion_on") == 0) {
241 spin_lock(&pd->lock);
242 v = pd->write_congestion_on;
243 spin_unlock(&pd->lock);
244 n = sprintf(data, "%d\n", v);
245 }
246 return n;
247}
248
249static void init_write_congestion_marks(int* lo, int* hi)
250{
251 if (*hi > 0) {
252 *hi = max(*hi, 500);
253 *hi = min(*hi, 1000000);
254 if (*lo <= 0)
255 *lo = *hi - 100;
256 else {
257 *lo = min(*lo, *hi - 100);
258 *lo = max(*lo, 100);
259 }
260 } else {
261 *hi = -1;
262 *lo = -1;
263 }
264}
265
266static ssize_t kobj_pkt_store(struct kobject *kobj,
267 struct attribute *attr,
268 const char *data, size_t len)
269{
270 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
271 int val;
32694850 272
83f3aa3d 273 if (strcmp(attr->name, "reset") == 0 && len > 0) {
32694850
TM		 274 pd->stats.pkt_started = 0;
275 pd->stats.pkt_ended = 0;
276 pd->stats.secs_w = 0;
277 pd->stats.secs_rg = 0;
278 pd->stats.secs_r = 0;
279
280 } else if (strcmp(attr->name, "congestion_off") == 0
83f3aa3d 281 && sscanf(data, "%d", &val) == 1) {
32694850
TM		 282 spin_lock(&pd->lock);
283 pd->write_congestion_off = val;
284 init_write_congestion_marks(&pd->write_congestion_off,
285 &pd->write_congestion_on);
286 spin_unlock(&pd->lock);
287
288 } else if (strcmp(attr->name, "congestion_on") == 0
83f3aa3d 289 && sscanf(data, "%d", &val) == 1) {
32694850
TM		 290 spin_lock(&pd->lock);
291 pd->write_congestion_on = val;
292 init_write_congestion_marks(&pd->write_congestion_off,
293 &pd->write_congestion_on);
294 spin_unlock(&pd->lock);
295 }
296 return len;
297}
298
52cf25d0 299static const struct sysfs_ops kobj_pkt_ops = {
32694850
TM		 300 .show = kobj_pkt_show,
301 .store = kobj_pkt_store
302};
303static struct kobj_type kobj_pkt_type_stat = {
304 .release = pkt_kobj_release,
305 .sysfs_ops = &kobj_pkt_ops,
306 .default_attrs = kobj_pkt_attrs_stat
307};
308static struct kobj_type kobj_pkt_type_wqueue = {
309 .release = pkt_kobj_release,
310 .sysfs_ops = &kobj_pkt_ops,
311 .default_attrs = kobj_pkt_attrs_wqueue
312};
313
314static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
315{
316 if (class_pktcdvd) {
cba76717 317 pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,
1ff9f542 318 "%s", pd->name);
6013c12b
TJ		 319 if (IS_ERR(pd->dev))
320 pd->dev = NULL;
32694850 321 }
6013c12b 322 if (pd->dev) {
32694850 323 pd->kobj_stat = pkt_kobj_create(pd, "stat",
6013c12b 324 &pd->dev->kobj,
32694850
TM		 325 &kobj_pkt_type_stat);
326 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
6013c12b 327 &pd->dev->kobj,
32694850
TM		 328 &kobj_pkt_type_wqueue);
329 }
330}
331
332static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
333{
334 pkt_kobj_remove(pd->kobj_stat);
335 pkt_kobj_remove(pd->kobj_wqueue);
336 if (class_pktcdvd)
ca0bf64d 337 device_unregister(pd->dev);
32694850
TM		 338}
339
340
341/********************************************************************
342 /sys/class/pktcdvd/
343 add map block device
344 remove unmap packet dev
345 device_map show mappings
346 *******************************************************************/
347
348static void class_pktcdvd_release(struct class *cls)
349{
350 kfree(cls);
351}
dc307f92
GKH		 352
353static ssize_t device_map_show(struct class *c, struct class_attribute *attr,
354 char *data)
32694850
TM		 355{
356 int n = 0;
357 int idx;
358 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
359 for (idx = 0; idx < MAX_WRITERS; idx++) {
360 struct pktcdvd_device *pd = pkt_devs[idx];
361 if (!pd)
362 continue;
363 n += sprintf(data+n, "%s %u:%u %u:%u\n",
364 pd->name,
365 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
366 MAJOR(pd->bdev->bd_dev),
367 MINOR(pd->bdev->bd_dev));
368 }
369 mutex_unlock(&ctl_mutex);
370 return n;
371}
dc307f92 372static CLASS_ATTR_RO(device_map);
32694850 373
dc307f92
GKH		 374static ssize_t add_store(struct class *c, struct class_attribute *attr,
375 const char *buf, size_t count)
32694850
TM		 376{
377 unsigned int major, minor;
fffe487d 378
83f3aa3d 379 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
fffe487d
TH		 380 /* pkt_setup_dev() expects caller to hold reference to self */
381 if (!try_module_get(THIS_MODULE))
382 return -ENODEV;
383
32694850 384 pkt_setup_dev(MKDEV(major, minor), NULL);
fffe487d
TH		 385
386 module_put(THIS_MODULE);
387
32694850
TM		 388 return count;
389 }
fffe487d 390
32694850
TM		 391 return -EINVAL;
392}
dc307f92 393static CLASS_ATTR_WO(add);
32694850 394
dc307f92
GKH		 395static ssize_t remove_store(struct class *c, struct class_attribute *attr,
396 const char *buf, size_t count)
32694850
TM		 397{
398 unsigned int major, minor;
83f3aa3d 399 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
32694850
TM		 400 pkt_remove_dev(MKDEV(major, minor));
401 return count;
402 }
403 return -EINVAL;
404}
dc307f92 405static CLASS_ATTR_WO(remove);
32694850 406
dc307f92
GKH		 407static struct attribute *class_pktcdvd_attrs[] = {
408 &class_attr_add.attr,
409 &class_attr_remove.attr,
410 &class_attr_device_map.attr,
411 NULL,
32694850 412};
dc307f92 413ATTRIBUTE_GROUPS(class_pktcdvd);
32694850
TM		 414
415static int pkt_sysfs_init(void)
416{
417 int ret = 0;
418
419 /*
420 * create control files in sysfs
421 * /sys/class/pktcdvd/...
422 */
423 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
424 if (!class_pktcdvd)
425 return -ENOMEM;
426 class_pktcdvd->name = DRIVER_NAME;
427 class_pktcdvd->owner = THIS_MODULE;
428 class_pktcdvd->class_release = class_pktcdvd_release;
dc307f92 429 class_pktcdvd->class_groups = class_pktcdvd_groups;
32694850
TM		 430 ret = class_register(class_pktcdvd);
431 if (ret) {
432 kfree(class_pktcdvd);
433 class_pktcdvd = NULL;
99481334 434 pr_err("failed to create class pktcdvd\n");
32694850
TM		 435 return ret;
436 }
437 return 0;
438}
439
440static void pkt_sysfs_cleanup(void)
441{
442 if (class_pktcdvd)
443 class_destroy(class_pktcdvd);
444 class_pktcdvd = NULL;
445}
446
447/********************************************************************
448 entries in debugfs
449
156f5a78 450 /sys/kernel/debug/pktcdvd[0-7]/
32694850
TM		 451 info
452
453 *******************************************************************/
454
455static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
456{
457 return pkt_seq_show(m, p);
458}
459
460static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
461{
462 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
463}
464
2b8693c0 465static const struct file_operations debug_fops = {
32694850
TM		 466 .open = pkt_debugfs_fops_open,
467 .read = seq_read,
468 .llseek = seq_lseek,
469 .release = single_release,
470 .owner = THIS_MODULE,
471};
472
473static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
474{
475 if (!pkt_debugfs_root)
476 return;
32694850 477 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
49c2856a 478 if (!pd->dfs_d_root)
32694850 479 return;
49c2856a 480
32694850
TM		 481 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
482 pd->dfs_d_root, pd, &debug_fops);
32694850
TM		 483}
484
485static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
486{
487 if (!pkt_debugfs_root)
488 return;
49c2856a
DC		 489 debugfs_remove(pd->dfs_f_info);
490 debugfs_remove(pd->dfs_d_root);
32694850 491 pd->dfs_f_info = NULL;
32694850
TM		 492 pd->dfs_d_root = NULL;
493}
494
495static void pkt_debugfs_init(void)
496{
497 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
32694850
TM		 498}
499
500static void pkt_debugfs_cleanup(void)
501{
32694850
TM		 502 debugfs_remove(pkt_debugfs_root);
503 pkt_debugfs_root = NULL;
504}
505
506/* ----------------------------------------------------------*/
507
1da177e4
LT		 508
509static void pkt_bio_finished(struct pktcdvd_device *pd)
510{
511 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
512 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
844aa797 513 pkt_dbg(2, pd, "queue empty\n");
1da177e4
LT		 514 atomic_set(&pd->iosched.attention, 1);
515 wake_up(&pd->wqueue);
516 }
517}
518
1da177e4
LT		 519/*
520 * Allocate a packet_data struct
521 */
e1bc89bc 522static struct packet_data *pkt_alloc_packet_data(int frames)
1da177e4
LT		 523{
524 int i;
525 struct packet_data *pkt;
526
1107d2e0 527 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
1da177e4
LT		 528 if (!pkt)
529 goto no_pkt;
1da177e4 530
e1bc89bc 531 pkt->frames = frames;
ccc5c9ca 532 pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
1da177e4
LT		 533 if (!pkt->w_bio)
534 goto no_bio;
535
e1bc89bc 536 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
1da177e4
LT		 537 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
538 if (!pkt->pages[i])
539 goto no_page;
540 }
541
542 spin_lock_init(&pkt->lock);
c5ecc484 543 bio_list_init(&pkt->orig_bios);
1da177e4 544
e1bc89bc 545 for (i = 0; i < frames; i++) {
ccc5c9ca 546 struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
1da177e4
LT		 547 if (!bio)
548 goto no_rd_bio;
ccc5c9ca 549
1da177e4
LT		 550 pkt->r_bios[i] = bio;
551 }
552
553 return pkt;
554
555no_rd_bio:
e1bc89bc 556 for (i = 0; i < frames; i++) {
1da177e4
LT		 557 struct bio *bio = pkt->r_bios[i];
558 if (bio)
559 bio_put(bio);
560 }
561
562no_page:
e1bc89bc 563 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
1da177e4
LT		 564 if (pkt->pages[i])
565 __free_page(pkt->pages[i]);
566 bio_put(pkt->w_bio);
567no_bio:
568 kfree(pkt);
569no_pkt:
570 return NULL;
571}
572
573/*
574 * Free a packet_data struct
575 */
576static void pkt_free_packet_data(struct packet_data *pkt)
577{
578 int i;
579
e1bc89bc 580 for (i = 0; i < pkt->frames; i++) {
1da177e4
LT		 581 struct bio *bio = pkt->r_bios[i];
582 if (bio)
583 bio_put(bio);
584 }
e1bc89bc 585 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
1da177e4
LT		 586 __free_page(pkt->pages[i]);
587 bio_put(pkt->w_bio);
588 kfree(pkt);
589}
590
591static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
592{
593 struct packet_data *pkt, *next;
594
595 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
596
597 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
598 pkt_free_packet_data(pkt);
599 }
e1bc89bc 600 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
1da177e4
LT		 601}
602
603static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
604{
605 struct packet_data *pkt;
606
e1bc89bc
PO		 607 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
608
1da177e4 609 while (nr_packets > 0) {
e1bc89bc 610 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
1da177e4
LT		 611 if (!pkt) {
612 pkt_shrink_pktlist(pd);
613 return 0;
614 }
615 pkt->id = nr_packets;
616 pkt->pd = pd;
617 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
618 nr_packets--;
619 }
620 return 1;
621}
622
1da177e4
LT		 623static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
624{
625 struct rb_node *n = rb_next(&node->rb_node);
626 if (!n)
627 return NULL;
628 return rb_entry(n, struct pkt_rb_node, rb_node);
629}
630
ac893963 631static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
1da177e4
LT		 632{
633 rb_erase(&node->rb_node, &pd->bio_queue);
634 mempool_free(node, pd->rb_pool);
635 pd->bio_queue_size--;
636 BUG_ON(pd->bio_queue_size < 0);
637}
638
639/*
640 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
641 */
642static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
643{
644 struct rb_node *n = pd->bio_queue.rb_node;
645 struct rb_node *next;
646 struct pkt_rb_node *tmp;
647
648 if (!n) {
649 BUG_ON(pd->bio_queue_size > 0);
650 return NULL;
651 }
652
653 for (;;) {
654 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
4f024f37 655 if (s <= tmp->bio->bi_iter.bi_sector)
1da177e4
LT		 656 next = n->rb_left;
657 else
658 next = n->rb_right;
659 if (!next)
660 break;
661 n = next;
662 }
663
4f024f37 664 if (s > tmp->bio->bi_iter.bi_sector) {
1da177e4
LT		 665 tmp = pkt_rbtree_next(tmp);
666 if (!tmp)
667 return NULL;
668 }
4f024f37 669 BUG_ON(s > tmp->bio->bi_iter.bi_sector);
1da177e4
LT		 670 return tmp;
671}
672
673/*
674 * Insert a node into the pd->bio_queue rb tree.
675 */
676static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
677{
678 struct rb_node **p = &pd->bio_queue.rb_node;
679 struct rb_node *parent = NULL;
4f024f37 680 sector_t s = node->bio->bi_iter.bi_sector;
1da177e4
LT		 681 struct pkt_rb_node *tmp;
682
683 while (*p) {
684 parent = *p;
685 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
4f024f37 686 if (s < tmp->bio->bi_iter.bi_sector)
1da177e4
LT		 687 p = &(*p)->rb_left;
688 else
689 p = &(*p)->rb_right;
690 }
691 rb_link_node(&node->rb_node, parent, p);
692 rb_insert_color(&node->rb_node, &pd->bio_queue);
693 pd->bio_queue_size++;
694}
695
1da177e4
LT		 696/*
697 * Send a packet_command to the underlying block device and
698 * wait for completion.
699 */
700static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
701{
165125e1 702 struct request_queue *q = bdev_get_queue(pd->bdev);
1da177e4 703 struct request *rq;
406c9b60
CH		 704 int ret = 0;
705
706 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
aebf526b 707 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, __GFP_RECLAIM);
a492f075
JL		 708 if (IS_ERR(rq))
709 return PTR_ERR(rq);
406c9b60
CH		 710
711 if (cgc->buflen) {
8586ea96 712 ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
71baba4b 713 __GFP_RECLAIM);
8586ea96 714 if (ret)
406c9b60
CH		 715 goto out;
716 }
1da177e4 717
82ed4db4
CH		 718 scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
719 memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE);
1da177e4 720
1da177e4 721 rq->timeout = 60*HZ;
1da177e4 722 if (cgc->quiet)
e8064021 723 rq->rq_flags |= RQF_QUIET;
1da177e4 724
406c9b60 725 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
17d5363b 726 if (scsi_req(rq)->result)
cbc31a47 727 ret = -EIO;
406c9b60 728out:
1da177e4 729 blk_put_request(rq);
406c9b60 730 return ret;
1da177e4
LT		 731}
732
99481334
JP		 733static const char *sense_key_string(__u8 index)
734{
735 static const char * const info[] = {
736 "No sense", "Recovered error", "Not ready",
737 "Medium error", "Hardware error", "Illegal request",
738 "Unit attention", "Data protect", "Blank check",
739 };
740
741 return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
742}
743
1da177e4
LT		 744/*
745 * A generic sense dump / resolve mechanism should be implemented across
746 * all ATAPI + SCSI devices.
747 */
f3ded788
JP		 748static void pkt_dump_sense(struct pktcdvd_device *pd,
749 struct packet_command *cgc)
1da177e4 750{
1da177e4
LT		 751 struct request_sense *sense = cgc->sense;
752
99481334 753 if (sense)
f3ded788
JP		 754 pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
755 CDROM_PACKET_SIZE, cgc->cmd,
756 sense->sense_key, sense->asc, sense->ascq,
757 sense_key_string(sense->sense_key));
99481334 758 else
f3ded788 759 pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
1da177e4
LT		 760}
761
762/*
763 * flush the drive cache to media
764 */
765static int pkt_flush_cache(struct pktcdvd_device *pd)
766{
767 struct packet_command cgc;
768
769 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
770 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
771 cgc.quiet = 1;
772
773 /*
774 * the IMMED bit -- we default to not setting it, although that
775 * would allow a much faster close, this is safer
776 */
777#if 0
778 cgc.cmd[1] = 1 << 1;
779#endif
780 return pkt_generic_packet(pd, &cgc);
781}
782
783/*
784 * speed is given as the normal factor, e.g. 4 for 4x
785 */
05680d86
PO		 786static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
787 unsigned write_speed, unsigned read_speed)
1da177e4
LT		 788{
789 struct packet_command cgc;
790 struct request_sense sense;
791 int ret;
792
793 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
794 cgc.sense = &sense;
795 cgc.cmd[0] = GPCMD_SET_SPEED;
796 cgc.cmd[2] = (read_speed >> 8) & 0xff;
797 cgc.cmd[3] = read_speed & 0xff;
798 cgc.cmd[4] = (write_speed >> 8) & 0xff;
799 cgc.cmd[5] = write_speed & 0xff;
800
801 if ((ret = pkt_generic_packet(pd, &cgc)))
f3ded788 802 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 803
804 return ret;
805}
806
807/*
808 * Queue a bio for processing by the low-level CD device. Must be called
809 * from process context.
810 */
46c271be 811static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
1da177e4
LT		 812{
813 spin_lock(&pd->iosched.lock);
c5ecc484
AM		 814 if (bio_data_dir(bio) == READ)
815 bio_list_add(&pd->iosched.read_queue, bio);
816 else
817 bio_list_add(&pd->iosched.write_queue, bio);
1da177e4
LT		 818 spin_unlock(&pd->iosched.lock);
819
820 atomic_set(&pd->iosched.attention, 1);
821 wake_up(&pd->wqueue);
822}
823
824/*
825 * Process the queued read/write requests. This function handles special
826 * requirements for CDRW drives:
827 * - A cache flush command must be inserted before a read request if the
828 * previous request was a write.
46c271be 829 * - Switching between reading and writing is slow, so don't do it more often
1da177e4 830 * than necessary.
46c271be
PO		 831 * - Optimize for throughput at the expense of latency. This means that streaming
832 * writes will never be interrupted by a read, but if the drive has to seek
833 * before the next write, switch to reading instead if there are any pending
834 * read requests.
1da177e4
LT		 835 * - Set the read speed according to current usage pattern. When only reading
836 * from the device, it's best to use the highest possible read speed, but
837 * when switching often between reading and writing, it's better to have the
838 * same read and write speeds.
1da177e4
LT		 839 */
840static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
841{
1da177e4
LT		 842
843 if (atomic_read(&pd->iosched.attention) == 0)
844 return;
845 atomic_set(&pd->iosched.attention, 0);
846
1da177e4
LT		 847 for (;;) {
848 struct bio *bio;
46c271be 849 int reads_queued, writes_queued;
1da177e4
LT		 850
851 spin_lock(&pd->iosched.lock);
c5ecc484
AM		 852 reads_queued = !bio_list_empty(&pd->iosched.read_queue);
853 writes_queued = !bio_list_empty(&pd->iosched.write_queue);
1da177e4
LT		 854 spin_unlock(&pd->iosched.lock);
855
856 if (!reads_queued && !writes_queued)
857 break;
858
859 if (pd->iosched.writing) {
46c271be
PO		 860 int need_write_seek = 1;
861 spin_lock(&pd->iosched.lock);
c5ecc484 862 bio = bio_list_peek(&pd->iosched.write_queue);
46c271be 863 spin_unlock(&pd->iosched.lock);
4f024f37
KO		 864 if (bio && (bio->bi_iter.bi_sector ==
865 pd->iosched.last_write))
46c271be
PO		 866 need_write_seek = 0;
867 if (need_write_seek && reads_queued) {
1da177e4 868 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
844aa797 869 pkt_dbg(2, pd, "write, waiting\n");
1da177e4
LT		 870 break;
871 }
872 pkt_flush_cache(pd);
873 pd->iosched.writing = 0;
874 }
875 } else {
876 if (!reads_queued && writes_queued) {
877 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
844aa797 878 pkt_dbg(2, pd, "read, waiting\n");
1da177e4
LT		 879 break;
880 }
881 pd->iosched.writing = 1;
882 }
883 }
884
885 spin_lock(&pd->iosched.lock);
c5ecc484
AM		 886 if (pd->iosched.writing)
887 bio = bio_list_pop(&pd->iosched.write_queue);
888 else
889 bio = bio_list_pop(&pd->iosched.read_queue);
1da177e4
LT		 890 spin_unlock(&pd->iosched.lock);
891
892 if (!bio)
893 continue;
894
895 if (bio_data_dir(bio) == READ)
4f024f37
KO		 896 pd->iosched.successive_reads +=
897 bio->bi_iter.bi_size >> 10;
46c271be 898 else {
1da177e4 899 pd->iosched.successive_reads = 0;
f73a1c7d 900 pd->iosched.last_write = bio_end_sector(bio);
46c271be 901 }
1da177e4
LT		 902 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
903 if (pd->read_speed == pd->write_speed) {
904 pd->read_speed = MAX_SPEED;
905 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
906 }
907 } else {
908 if (pd->read_speed != pd->write_speed) {
909 pd->read_speed = pd->write_speed;
910 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
911 }
912 }
913
914 atomic_inc(&pd->cdrw.pending_bios);
915 generic_make_request(bio);
916 }
917}
918
919/*
920 * Special care is needed if the underlying block device has a small
921 * max_phys_segments value.
922 */
165125e1 923static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
1da177e4 924{
ae03bf63 925 if ((pd->settings.size << 9) / CD_FRAMESIZE
8a78362c 926 <= queue_max_segments(q)) {
1da177e4
LT		 927 /*
928 * The cdrom device can handle one segment/frame
929 */
930 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
931 return 0;
ae03bf63 932 } else if ((pd->settings.size << 9) / PAGE_SIZE
8a78362c 933 <= queue_max_segments(q)) {
1da177e4
LT		 934 /*
935 * We can handle this case at the expense of some extra memory
936 * copies during write operations
937 */
938 set_bit(PACKET_MERGE_SEGS, &pd->flags);
939 return 0;
940 } else {
fa63c0ab 941 pkt_err(pd, "cdrom max_phys_segments too small\n");
1da177e4
LT		 942 return -EIO;
943 }
944}
945
4246a0b6 946static void pkt_end_io_read(struct bio *bio)
1da177e4
LT		 947{
948 struct packet_data *pkt = bio->bi_private;
949 struct pktcdvd_device *pd = pkt->pd;
950 BUG_ON(!pd);
951
844aa797 952 pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
cd3f2cd0 953 bio, (unsigned long long)pkt->sector,
4e4cbee9 954 (unsigned long long)bio->bi_iter.bi_sector, bio->bi_status);
1da177e4 955
4e4cbee9 956 if (bio->bi_status)
1da177e4
LT		 957 atomic_inc(&pkt->io_errors);
958 if (atomic_dec_and_test(&pkt->io_wait)) {
959 atomic_inc(&pkt->run_sm);
960 wake_up(&pd->wqueue);
961 }
962 pkt_bio_finished(pd);
1da177e4
LT		 963}
964
4246a0b6 965static void pkt_end_io_packet_write(struct bio *bio)
1da177e4
LT		 966{
967 struct packet_data *pkt = bio->bi_private;
968 struct pktcdvd_device *pd = pkt->pd;
969 BUG_ON(!pd);
970
4e4cbee9 971 pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status);
1da177e4
LT		 972
973 pd->stats.pkt_ended++;
974
975 pkt_bio_finished(pd);
976 atomic_dec(&pkt->io_wait);
977 atomic_inc(&pkt->run_sm);
978 wake_up(&pd->wqueue);
1da177e4
LT		 979}
980
981/*
982 * Schedule reads for the holes in a packet
983 */
984static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
985{
986 int frames_read = 0;
987 struct bio *bio;
988 int f;
989 char written[PACKET_MAX_SIZE];
990
c5ecc484 991 BUG_ON(bio_list_empty(&pkt->orig_bios));
1da177e4
LT		 992
993 atomic_set(&pkt->io_wait, 0);
994 atomic_set(&pkt->io_errors, 0);
995
1da177e4
LT		 996 /*
997 * Figure out which frames we need to read before we can write.
998 */
999 memset(written, 0, sizeof(written));
1000 spin_lock(&pkt->lock);
c5ecc484 1001 bio_list_for_each(bio, &pkt->orig_bios) {
4f024f37
KO		 1002 int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
1003 (CD_FRAMESIZE >> 9);
1004 int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
06e7ab53 1005 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
1da177e4
LT		 1006 BUG_ON(first_frame < 0);
1007 BUG_ON(first_frame + num_frames > pkt->frames);
1008 for (f = first_frame; f < first_frame + num_frames; f++)
1009 written[f] = 1;
1010 }
1011 spin_unlock(&pkt->lock);
1012
06e7ab53 1013 if (pkt->cache_valid) {
844aa797 1014 pkt_dbg(2, pd, "zone %llx cached\n",
06e7ab53
PO		 1015 (unsigned long long)pkt->sector);
1016 goto out_account;
1017 }
1018
1da177e4
LT		 1019 /*
1020 * Schedule reads for missing parts of the packet.
1021 */
1022 for (f = 0; f < pkt->frames; f++) {
1023 int p, offset;
ccc5c9ca 1024
1da177e4
LT		 1025 if (written[f])
1026 continue;
ccc5c9ca 1027
1da177e4 1028 bio = pkt->r_bios[f];
ccc5c9ca 1029 bio_reset(bio);
4f024f37 1030 bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1da177e4
LT		 1031 bio->bi_bdev = pd->bdev;
1032 bio->bi_end_io = pkt_end_io_read;
1033 bio->bi_private = pkt;
1034
1035 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1036 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
844aa797 1037 pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
1da177e4
LT		 1038 f, pkt->pages[p], offset);
1039 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1040 BUG();
1041
1042 atomic_inc(&pkt->io_wait);
95fe6c1a 1043 bio_set_op_attrs(bio, REQ_OP_READ, 0);
46c271be 1044 pkt_queue_bio(pd, bio);
1da177e4
LT		 1045 frames_read++;
1046 }
1047
1048out_account:
844aa797 1049 pkt_dbg(2, pd, "need %d frames for zone %llx\n",
1da177e4
LT		 1050 frames_read, (unsigned long long)pkt->sector);
1051 pd->stats.pkt_started++;
1052 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1da177e4
LT		 1053}
1054
1055/*
1056 * Find a packet matching zone, or the least recently used packet if
1057 * there is no match.
1058 */
1059static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1060{
1061 struct packet_data *pkt;
1062
1063 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1064 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1065 list_del_init(&pkt->list);
1066 if (pkt->sector != zone)
1067 pkt->cache_valid = 0;
610827de 1068 return pkt;
1da177e4
LT		 1069 }
1070 }
610827de
PO		 1071 BUG();
1072 return NULL;
1da177e4
LT		 1073}
1074
1075static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1076{
1077 if (pkt->cache_valid) {
1078 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1079 } else {
1080 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1081 }
1082}
1083
1084/*
1085 * recover a failed write, query for relocation if possible
1086 *
1087 * returns 1 if recovery is possible, or 0 if not
1088 *
1089 */
1090static int pkt_start_recovery(struct packet_data *pkt)
1091{
1092 /*
1093 * FIXME. We need help from the file system to implement
1094 * recovery handling.
1095 */
1096 return 0;
1097#if 0
1098 struct request *rq = pkt->rq;
1099 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1100 struct block_device *pkt_bdev;
1101 struct super_block *sb = NULL;
1102 unsigned long old_block, new_block;
1103 sector_t new_sector;
1104
1105 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1106 if (pkt_bdev) {
1107 sb = get_super(pkt_bdev);
1108 bdput(pkt_bdev);
1109 }
1110
1111 if (!sb)
1112 return 0;
1113
e7f59097 1114 if (!sb->s_op->relocate_blocks)
1da177e4
LT		 1115 goto out;
1116
1117 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1118 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1119 goto out;
1120
1121 new_sector = new_block * (CD_FRAMESIZE >> 9);
1122 pkt->sector = new_sector;
1123
ff8e0070
KO		 1124 bio_reset(pkt->bio);
1125 pkt->bio->bi_bdev = pd->bdev;
1eff9d32 1126 bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0);
4f024f37
KO		 1127 pkt->bio->bi_iter.bi_sector = new_sector;
1128 pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;
ff8e0070 1129 pkt->bio->bi_vcnt = pkt->frames;
1da177e4 1130
ff8e0070
KO		 1131 pkt->bio->bi_end_io = pkt_end_io_packet_write;
1132 pkt->bio->bi_private = pkt;
1da177e4
LT		 1133
1134 drop_super(sb);
1135 return 1;
1136
1137out:
1138 drop_super(sb);
1139 return 0;
1140#endif
1141}
1142
1143static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1144{
1145#if PACKET_DEBUG > 1
1146 static const char *state_name[] = {
1147 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1148 };
1149 enum packet_data_state old_state = pkt->state;
844aa797 1150 pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
cd3f2cd0 1151 pkt->id, (unsigned long long)pkt->sector,
1da177e4
LT		 1152 state_name[old_state], state_name[state]);
1153#endif
1154 pkt->state = state;
1155}
1156
1157/*
1158 * Scan the work queue to see if we can start a new packet.
1159 * returns non-zero if any work was done.
1160 */
1161static int pkt_handle_queue(struct pktcdvd_device *pd)
1162{
1163 struct packet_data *pkt, *p;
1164 struct bio *bio = NULL;
1165 sector_t zone = 0; /* Suppress gcc warning */
1166 struct pkt_rb_node *node, *first_node;
1167 struct rb_node *n;
0a0fc960 1168 int wakeup;
1da177e4 1169
1da177e4
LT		 1170 atomic_set(&pd->scan_queue, 0);
1171
1172 if (list_empty(&pd->cdrw.pkt_free_list)) {
844aa797 1173 pkt_dbg(2, pd, "no pkt\n");
1da177e4
LT		 1174 return 0;
1175 }
1176
1177 /*
1178 * Try to find a zone we are not already working on.
1179 */
1180 spin_lock(&pd->lock);
1181 first_node = pkt_rbtree_find(pd, pd->current_sector);
1182 if (!first_node) {
1183 n = rb_first(&pd->bio_queue);
1184 if (n)
1185 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1186 }
1187 node = first_node;
1188 while (node) {
1189 bio = node->bio;
4f024f37 1190 zone = get_zone(bio->bi_iter.bi_sector, pd);
1da177e4 1191 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
7baeb6a5
PO		 1192 if (p->sector == zone) {
1193 bio = NULL;
1da177e4 1194 goto try_next_bio;
7baeb6a5 1195 }
1da177e4
LT		 1196 }
1197 break;
1198try_next_bio:
1199 node = pkt_rbtree_next(node);
1200 if (!node) {
1201 n = rb_first(&pd->bio_queue);
1202 if (n)
1203 node = rb_entry(n, struct pkt_rb_node, rb_node);
1204 }
1205 if (node == first_node)
1206 node = NULL;
1207 }
1208 spin_unlock(&pd->lock);
1209 if (!bio) {
844aa797 1210 pkt_dbg(2, pd, "no bio\n");
1da177e4
LT		 1211 return 0;
1212 }
1213
1214 pkt = pkt_get_packet_data(pd, zone);
1da177e4
LT		 1215
1216 pd->current_sector = zone + pd->settings.size;
1217 pkt->sector = zone;
e1bc89bc 1218 BUG_ON(pkt->frames != pd->settings.size >> 2);
1da177e4
LT		 1219 pkt->write_size = 0;
1220
1221 /*
1222 * Scan work queue for bios in the same zone and link them
1223 * to this packet.
1224 */
1225 spin_lock(&pd->lock);
844aa797 1226 pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
1da177e4
LT		 1227 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1228 bio = node->bio;
4f024f37
KO		 1229 pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
1230 get_zone(bio->bi_iter.bi_sector, pd));
1231 if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
1da177e4
LT		 1232 break;
1233 pkt_rbtree_erase(pd, node);
1234 spin_lock(&pkt->lock);
c5ecc484 1235 bio_list_add(&pkt->orig_bios, bio);
4f024f37 1236 pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
1da177e4
LT		 1237 spin_unlock(&pkt->lock);
1238 }
0a0fc960
TM		 1239 /* check write congestion marks, and if bio_queue_size is
1240 below, wake up any waiters */
1241 wakeup = (pd->write_congestion_on > 0
1242 && pd->bio_queue_size <= pd->write_congestion_off);
1da177e4 1243 spin_unlock(&pd->lock);
8aa7e847 1244 if (wakeup) {
dc3b17cc 1245 clear_bdi_congested(pd->disk->queue->backing_dev_info,
8aa7e847
JA		 1246 BLK_RW_ASYNC);
1247 }
1da177e4
LT		 1248
1249 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1250 pkt_set_state(pkt, PACKET_WAITING_STATE);
1251 atomic_set(&pkt->run_sm, 1);
1252
1253 spin_lock(&pd->cdrw.active_list_lock);
1254 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1255 spin_unlock(&pd->cdrw.active_list_lock);
1256
1257 return 1;
1258}
1259
1260/*
1261 * Assemble a bio to write one packet and queue the bio for processing
1262 * by the underlying block device.
1263 */
1264static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1265{
1da177e4 1266 int f;
1da177e4 1267
ffb25dc6 1268 bio_reset(pkt->w_bio);
4f024f37 1269 pkt->w_bio->bi_iter.bi_sector = pkt->sector;
ffb25dc6
KO		 1270 pkt->w_bio->bi_bdev = pd->bdev;
1271 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1272 pkt->w_bio->bi_private = pkt;
1273
1274 /* XXX: locking? */
1da177e4 1275 for (f = 0; f < pkt->frames; f++) {
feebd568
CH		 1276 struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1277 unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1278
1279 if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
ffb25dc6 1280 BUG();
1da177e4 1281 }
844aa797 1282 pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
1da177e4
LT		 1283
1284 /*
72772323 1285 * Fill-in bvec with data from orig_bios.
1da177e4 1286 */
1da177e4 1287 spin_lock(&pkt->lock);
ffb25dc6 1288 bio_copy_data(pkt->w_bio, pkt->orig_bios.head);
1da177e4 1289
1da177e4
LT		 1290 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1291 spin_unlock(&pkt->lock);
1292
844aa797 1293 pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
ffb25dc6 1294 pkt->write_size, (unsigned long long)pkt->sector);
1da177e4 1295
feebd568 1296 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
1da177e4 1297 pkt->cache_valid = 1;
feebd568 1298 else
1da177e4 1299 pkt->cache_valid = 0;
1da177e4
LT		 1300
1301 /* Start the write request */
1da177e4 1302 atomic_set(&pkt->io_wait, 1);
95fe6c1a 1303 bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0);
46c271be 1304 pkt_queue_bio(pd, pkt->w_bio);
1da177e4
LT		 1305}
1306
4e4cbee9 1307static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
1da177e4 1308{
c5ecc484 1309 struct bio *bio;
1da177e4 1310
4e4cbee9 1311 if (status)
1da177e4
LT		 1312 pkt->cache_valid = 0;
1313
1314 /* Finish all bios corresponding to this packet */
4246a0b6 1315 while ((bio = bio_list_pop(&pkt->orig_bios))) {
4e4cbee9 1316 bio->bi_status = status;
4246a0b6
CH		 1317 bio_endio(bio);
1318 }
1da177e4
LT		 1319}
1320
1321static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1322{
844aa797 1323 pkt_dbg(2, pd, "pkt %d\n", pkt->id);
1da177e4
LT		 1324
1325 for (;;) {
1326 switch (pkt->state) {
1327 case PACKET_WAITING_STATE:
1328 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1329 return;
1330
1331 pkt->sleep_time = 0;
1332 pkt_gather_data(pd, pkt);
1333 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1334 break;
1335
1336 case PACKET_READ_WAIT_STATE:
1337 if (atomic_read(&pkt->io_wait) > 0)
1338 return;
1339
1340 if (atomic_read(&pkt->io_errors) > 0) {
1341 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1342 } else {
1343 pkt_start_write(pd, pkt);
1344 }
1345 break;
1346
1347 case PACKET_WRITE_WAIT_STATE:
1348 if (atomic_read(&pkt->io_wait) > 0)
1349 return;
1350
4e4cbee9 1351 if (!pkt->w_bio->bi_status) {
1da177e4
LT		 1352 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1353 } else {
1354 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1355 }
1356 break;
1357
1358 case PACKET_RECOVERY_STATE:
1359 if (pkt_start_recovery(pkt)) {
1360 pkt_start_write(pd, pkt);
1361 } else {
844aa797 1362 pkt_dbg(2, pd, "No recovery possible\n");
1da177e4
LT		 1363 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1364 }
1365 break;
1366
1367 case PACKET_FINISHED_STATE:
4e4cbee9 1368 pkt_finish_packet(pkt, pkt->w_bio->bi_status);
1da177e4
LT		 1369 return;
1370
1371 default:
1372 BUG();
1373 break;
1374 }
1375 }
1376}
1377
1378static void pkt_handle_packets(struct pktcdvd_device *pd)
1379{
1380 struct packet_data *pkt, *next;
1381
1da177e4
LT		 1382 /*
1383 * Run state machine for active packets
1384 */
1385 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1386 if (atomic_read(&pkt->run_sm) > 0) {
1387 atomic_set(&pkt->run_sm, 0);
1388 pkt_run_state_machine(pd, pkt);
1389 }
1390 }
1391
1392 /*
1393 * Move no longer active packets to the free list
1394 */
1395 spin_lock(&pd->cdrw.active_list_lock);
1396 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1397 if (pkt->state == PACKET_FINISHED_STATE) {
1398 list_del(&pkt->list);
1399 pkt_put_packet_data(pd, pkt);
1400 pkt_set_state(pkt, PACKET_IDLE_STATE);
1401 atomic_set(&pd->scan_queue, 1);
1402 }
1403 }
1404 spin_unlock(&pd->cdrw.active_list_lock);
1405}
1406
1407static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1408{
1409 struct packet_data *pkt;
1410 int i;
1411
ae7642bb 1412 for (i = 0; i < PACKET_NUM_STATES; i++)
1da177e4
LT		 1413 states[i] = 0;
1414
1415 spin_lock(&pd->cdrw.active_list_lock);
1416 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1417 states[pkt->state]++;
1418 }
1419 spin_unlock(&pd->cdrw.active_list_lock);
1420}
1421
1422/*
1423 * kcdrwd is woken up when writes have been queued for one of our
1424 * registered devices
1425 */
1426static int kcdrwd(void *foobar)
1427{
1428 struct pktcdvd_device *pd = foobar;
1429 struct packet_data *pkt;
1430 long min_sleep_time, residue;
1431
8698a745 1432 set_user_nice(current, MIN_NICE);
83144186 1433 set_freezable();
1da177e4
LT		 1434
1435 for (;;) {
1436 DECLARE_WAITQUEUE(wait, current);
1437
1438 /*
1439 * Wait until there is something to do
1440 */
1441 add_wait_queue(&pd->wqueue, &wait);
1442 for (;;) {
1443 set_current_state(TASK_INTERRUPTIBLE);
1444
1445 /* Check if we need to run pkt_handle_queue */
1446 if (atomic_read(&pd->scan_queue) > 0)
1447 goto work_to_do;
1448
1449 /* Check if we need to run the state machine for some packet */
1450 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1451 if (atomic_read(&pkt->run_sm) > 0)
1452 goto work_to_do;
1453 }
1454
1455 /* Check if we need to process the iosched queues */
1456 if (atomic_read(&pd->iosched.attention) != 0)
1457 goto work_to_do;
1458
1459 /* Otherwise, go to sleep */
1460 if (PACKET_DEBUG > 1) {
1461 int states[PACKET_NUM_STATES];
1462 pkt_count_states(pd, states);
844aa797 1463 pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
cd3f2cd0
JP		 1464 states[0], states[1], states[2],
1465 states[3], states[4], states[5]);
1da177e4
LT		 1466 }
1467
1468 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1469 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1470 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1471 min_sleep_time = pkt->sleep_time;
1472 }
1473
844aa797 1474 pkt_dbg(2, pd, "sleeping\n");
1da177e4 1475 residue = schedule_timeout(min_sleep_time);
844aa797 1476 pkt_dbg(2, pd, "wake up\n");
1da177e4
LT		 1477
1478 /* make swsusp happy with our thread */
3e1d1d28 1479 try_to_freeze();
1da177e4
LT		 1480
1481 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1482 if (!pkt->sleep_time)
1483 continue;
1484 pkt->sleep_time -= min_sleep_time - residue;
1485 if (pkt->sleep_time <= 0) {
1486 pkt->sleep_time = 0;
1487 atomic_inc(&pkt->run_sm);
1488 }
1489 }
1490
1da177e4
LT		 1491 if (kthread_should_stop())
1492 break;
1493 }
1494work_to_do:
1495 set_current_state(TASK_RUNNING);
1496 remove_wait_queue(&pd->wqueue, &wait);
1497
1498 if (kthread_should_stop())
1499 break;
1500
1501 /*
1502 * if pkt_handle_queue returns true, we can queue
1503 * another request.
1504 */
1505 while (pkt_handle_queue(pd))
1506 ;
1507
1508 /*
1509 * Handle packet state machine
1510 */
1511 pkt_handle_packets(pd);
1512
1513 /*
1514 * Handle iosched queues
1515 */
1516 pkt_iosched_process_queue(pd);
1517 }
1518
1519 return 0;
1520}
1521
1522static void pkt_print_settings(struct pktcdvd_device *pd)
1523{
0c075d64
JP		 1524 pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
1525 pd->settings.fp ? "Fixed" : "Variable",
1526 pd->settings.size >> 2,
1527 pd->settings.block_mode == 8 ? '1' : '2');
1da177e4
LT		 1528}
1529
1530static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1531{
1532 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1533
1534 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1535 cgc->cmd[2] = page_code | (page_control << 6);
1536 cgc->cmd[7] = cgc->buflen >> 8;
1537 cgc->cmd[8] = cgc->buflen & 0xff;
1538 cgc->data_direction = CGC_DATA_READ;
1539 return pkt_generic_packet(pd, cgc);
1540}
1541
1542static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1543{
1544 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1545 memset(cgc->buffer, 0, 2);
1546 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1547 cgc->cmd[1] = 0x10; /* PF */
1548 cgc->cmd[7] = cgc->buflen >> 8;
1549 cgc->cmd[8] = cgc->buflen & 0xff;
1550 cgc->data_direction = CGC_DATA_WRITE;
1551 return pkt_generic_packet(pd, cgc);
1552}
1553
1554static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1555{
1556 struct packet_command cgc;
1557 int ret;
1558
1559 /* set up command and get the disc info */
1560 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1561 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1562 cgc.cmd[8] = cgc.buflen = 2;
1563 cgc.quiet = 1;
1564
1565 if ((ret = pkt_generic_packet(pd, &cgc)))
1566 return ret;
1567
1568 /* not all drives have the same disc_info length, so requeue
1569 * packet with the length the drive tells us it can supply
1570 */
1571 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1572 sizeof(di->disc_information_length);
1573
1574 if (cgc.buflen > sizeof(disc_information))
1575 cgc.buflen = sizeof(disc_information);
1576
1577 cgc.cmd[8] = cgc.buflen;
1578 return pkt_generic_packet(pd, &cgc);
1579}
1580
1581static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1582{
1583 struct packet_command cgc;
1584 int ret;
1585
1586 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1587 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1588 cgc.cmd[1] = type & 3;
1589 cgc.cmd[4] = (track & 0xff00) >> 8;
1590 cgc.cmd[5] = track & 0xff;
1591 cgc.cmd[8] = 8;
1592 cgc.quiet = 1;
1593
1594 if ((ret = pkt_generic_packet(pd, &cgc)))
1595 return ret;
1596
1597 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1598 sizeof(ti->track_information_length);
1599
1600 if (cgc.buflen > sizeof(track_information))
1601 cgc.buflen = sizeof(track_information);
1602
1603 cgc.cmd[8] = cgc.buflen;
1604 return pkt_generic_packet(pd, &cgc);
1605}
1606
05680d86
PO		 1607static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1608 long *last_written)
1da177e4
LT		 1609{
1610 disc_information di;
1611 track_information ti;
1612 __u32 last_track;
1613 int ret = -1;
1614
1615 if ((ret = pkt_get_disc_info(pd, &di)))
1616 return ret;
1617
1618 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1619 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1620 return ret;
1621
1622 /* if this track is blank, try the previous. */
1623 if (ti.blank) {
1624 last_track--;
1625 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1626 return ret;
1627 }
1628
1629 /* if last recorded field is valid, return it. */
1630 if (ti.lra_v) {
1631 *last_written = be32_to_cpu(ti.last_rec_address);
1632 } else {
1633 /* make it up instead */
1634 *last_written = be32_to_cpu(ti.track_start) +
1635 be32_to_cpu(ti.track_size);
1636 if (ti.free_blocks)
1637 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1638 }
1639 return 0;
1640}
1641
1642/*
1643 * write mode select package based on pd->settings
1644 */
05680d86 1645static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
1da177e4
LT		 1646{
1647 struct packet_command cgc;
1648 struct request_sense sense;
1649 write_param_page *wp;
1650 char buffer[128];
1651 int ret, size;
1652
1653 /* doesn't apply to DVD+RW or DVD-RAM */
1654 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1655 return 0;
1656
1657 memset(buffer, 0, sizeof(buffer));
1658 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1659 cgc.sense = &sense;
1660 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
f3ded788 1661 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 1662 return ret;
1663 }
1664
1665 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1666 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1667 if (size > sizeof(buffer))
1668 size = sizeof(buffer);
1669
1670 /*
1671 * now get it all
1672 */
1673 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1674 cgc.sense = &sense;
1675 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
f3ded788 1676 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 1677 return ret;
1678 }
1679
1680 /*
1681 * write page is offset header + block descriptor length
1682 */
1683 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1684
1685 wp->fp = pd->settings.fp;
1686 wp->track_mode = pd->settings.track_mode;
1687 wp->write_type = pd->settings.write_type;
1688 wp->data_block_type = pd->settings.block_mode;
1689
1690 wp->multi_session = 0;
1691
1692#ifdef PACKET_USE_LS
1693 wp->link_size = 7;
1694 wp->ls_v = 1;
1695#endif
1696
1697 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1698 wp->session_format = 0;
1699 wp->subhdr2 = 0x20;
1700 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1701 wp->session_format = 0x20;
1702 wp->subhdr2 = 8;
1703#if 0
1704 wp->mcn[0] = 0x80;
1705 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1706#endif
1707 } else {
1708 /*
1709 * paranoia
1710 */
fa63c0ab 1711 pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
1da177e4
LT		 1712 return 1;
1713 }
1714 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1715
1716 cgc.buflen = cgc.cmd[8] = size;
1717 if ((ret = pkt_mode_select(pd, &cgc))) {
f3ded788 1718 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 1719 return ret;
1720 }
1721
1722 pkt_print_settings(pd);
1723 return 0;
1724}
1725
1726/*
7c613d59 1727 * 1 -- we can write to this track, 0 -- we can't
1da177e4 1728 */
ab863ec3 1729static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1da177e4 1730{
ab863ec3
PO		 1731 switch (pd->mmc3_profile) {
1732 case 0x1a: /* DVD+RW */
1733 case 0x12: /* DVD-RAM */
1734 /* The track is always writable on DVD+RW/DVD-RAM */
1735 return 1;
1736 default:
1737 break;
1738 }
1da177e4 1739
ab863ec3
PO		 1740 if (!ti->packet || !ti->fp)
1741 return 0;
1da177e4
LT		 1742
1743 /*
1744 * "good" settings as per Mt Fuji.
1745 */
ab863ec3 1746 if (ti->rt == 0 && ti->blank == 0)
7c613d59 1747 return 1;
1da177e4 1748
ab863ec3 1749 if (ti->rt == 0 && ti->blank == 1)
7c613d59 1750 return 1;
1da177e4 1751
ab863ec3 1752 if (ti->rt == 1 && ti->blank == 0)
7c613d59 1753 return 1;
1da177e4 1754
fa63c0ab 1755 pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
7c613d59 1756 return 0;
1da177e4
LT		 1757}
1758
1759/*
7c613d59 1760 * 1 -- we can write to this disc, 0 -- we can't
1da177e4 1761 */
7c613d59 1762static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1da177e4
LT		 1763{
1764 switch (pd->mmc3_profile) {
1765 case 0x0a: /* CD-RW */
1766 case 0xffff: /* MMC3 not supported */
1767 break;
1768 case 0x1a: /* DVD+RW */
1769 case 0x13: /* DVD-RW */
1770 case 0x12: /* DVD-RAM */
7c613d59 1771 return 1;
1da177e4 1772 default:
844aa797 1773 pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
cd3f2cd0 1774 pd->mmc3_profile);
7c613d59 1775 return 0;
1da177e4
LT		 1776 }
1777
1778 /*
1779 * for disc type 0xff we should probably reserve a new track.
1780 * but i'm not sure, should we leave this to user apps? probably.
1781 */
1782 if (di->disc_type == 0xff) {
ca73dabc 1783 pkt_notice(pd, "unknown disc - no track?\n");
7c613d59 1784 return 0;
1da177e4
LT		 1785 }
1786
1787 if (di->disc_type != 0x20 && di->disc_type != 0) {
fa63c0ab 1788 pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
7c613d59 1789 return 0;
1da177e4
LT		 1790 }
1791
1792 if (di->erasable == 0) {
ca73dabc 1793 pkt_notice(pd, "disc not erasable\n");
7c613d59 1794 return 0;
1da177e4
LT		 1795 }
1796
1797 if (di->border_status == PACKET_SESSION_RESERVED) {
fa63c0ab 1798 pkt_err(pd, "can't write to last track (reserved)\n");
7c613d59 1799 return 0;
1da177e4
LT		 1800 }
1801
7c613d59 1802 return 1;
1da177e4
LT		 1803}
1804
05680d86 1805static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
1da177e4
LT		 1806{
1807 struct packet_command cgc;
1808 unsigned char buf[12];
1809 disc_information di;
1810 track_information ti;
1811 int ret, track;
1812
1813 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1814 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1815 cgc.cmd[8] = 8;
1816 ret = pkt_generic_packet(pd, &cgc);
1817 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1818
1819 memset(&di, 0, sizeof(disc_information));
1820 memset(&ti, 0, sizeof(track_information));
1821
1822 if ((ret = pkt_get_disc_info(pd, &di))) {
fa63c0ab 1823 pkt_err(pd, "failed get_disc\n");
1da177e4
LT		 1824 return ret;
1825 }
1826
7c613d59 1827 if (!pkt_writable_disc(pd, &di))
9db91546 1828 return -EROFS;
1da177e4 1829
1da177e4
LT		 1830 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1831
1832 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1833 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
fa63c0ab 1834 pkt_err(pd, "failed get_track\n");
1da177e4
LT		 1835 return ret;
1836 }
1837
ab863ec3 1838 if (!pkt_writable_track(pd, &ti)) {
fa63c0ab 1839 pkt_err(pd, "can't write to this track\n");
9db91546 1840 return -EROFS;
1da177e4
LT		 1841 }
1842
1843 /*
1844 * we keep packet size in 512 byte units, makes it easier to
1845 * deal with request calculations.
1846 */
1847 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1848 if (pd->settings.size == 0) {
ca73dabc 1849 pkt_notice(pd, "detected zero packet size!\n");
a460ad62 1850 return -ENXIO;
1da177e4 1851 }
d0272e78 1852 if (pd->settings.size > PACKET_MAX_SECTORS) {
fa63c0ab 1853 pkt_err(pd, "packet size is too big\n");
9db91546 1854 return -EROFS;
d0272e78 1855 }
1da177e4
LT		 1856 pd->settings.fp = ti.fp;
1857 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1858
1859 if (ti.nwa_v) {
1860 pd->nwa = be32_to_cpu(ti.next_writable);
1861 set_bit(PACKET_NWA_VALID, &pd->flags);
1862 }
1863
1864 /*
1865 * in theory we could use lra on -RW media as well and just zero
1866 * blocks that haven't been written yet, but in practice that
1867 * is just a no-go. we'll use that for -R, naturally.
1868 */
1869 if (ti.lra_v) {
1870 pd->lra = be32_to_cpu(ti.last_rec_address);
1871 set_bit(PACKET_LRA_VALID, &pd->flags);
1872 } else {
1873 pd->lra = 0xffffffff;
1874 set_bit(PACKET_LRA_VALID, &pd->flags);
1875 }
1876
1877 /*
1878 * fine for now
1879 */
1880 pd->settings.link_loss = 7;
1881 pd->settings.write_type = 0; /* packet */
1882 pd->settings.track_mode = ti.track_mode;
1883
1884 /*
1885 * mode1 or mode2 disc
1886 */
1887 switch (ti.data_mode) {
1888 case PACKET_MODE1:
1889 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1890 break;
1891 case PACKET_MODE2:
1892 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1893 break;
1894 default:
fa63c0ab 1895 pkt_err(pd, "unknown data mode\n");
9db91546 1896 return -EROFS;
1da177e4
LT		 1897 }
1898 return 0;
1899}
1900
1901/*
1902 * enable/disable write caching on drive
1903 */
05680d86
PO		 1904static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
1905 int set)
1da177e4
LT		 1906{
1907 struct packet_command cgc;
1908 struct request_sense sense;
1909 unsigned char buf[64];
1910 int ret;
1911
1da177e4
LT		 1912 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1913 cgc.sense = &sense;
1914 cgc.buflen = pd->mode_offset + 12;
1915
1916 /*
1917 * caching mode page might not be there, so quiet this command
1918 */
1919 cgc.quiet = 1;
1920
1921 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1922 return ret;
1923
1924 buf[pd->mode_offset + 10] |= (!!set << 2);
1925
1926 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1927 ret = pkt_mode_select(pd, &cgc);
1928 if (ret) {
fa63c0ab 1929 pkt_err(pd, "write caching control failed\n");
f3ded788 1930 pkt_dump_sense(pd, &cgc);
1da177e4 1931 } else if (!ret && set)
ca73dabc 1932 pkt_notice(pd, "enabled write caching\n");
1da177e4
LT		 1933 return ret;
1934}
1935
1936static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1937{
1938 struct packet_command cgc;
1939
1940 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1941 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1942 cgc.cmd[4] = lockflag ? 1 : 0;
1943 return pkt_generic_packet(pd, &cgc);
1944}
1945
1946/*
1947 * Returns drive maximum write speed
1948 */
05680d86
PO		 1949static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
1950 unsigned *write_speed)
1da177e4
LT		 1951{
1952 struct packet_command cgc;
1953 struct request_sense sense;
1954 unsigned char buf[256+18];
1955 unsigned char *cap_buf;
1956 int ret, offset;
1957
1da177e4
LT		 1958 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1959 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1960 cgc.sense = &sense;
1961
1962 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1963 if (ret) {
1964 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1965 sizeof(struct mode_page_header);
1966 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1967 if (ret) {
f3ded788 1968 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 1969 return ret;
1970 }
1971 }
1972
1973 offset = 20; /* Obsoleted field, used by older drives */
1974 if (cap_buf[1] >= 28)
1975 offset = 28; /* Current write speed selected */
1976 if (cap_buf[1] >= 30) {
1977 /* If the drive reports at least one "Logical Unit Write
1978 * Speed Performance Descriptor Block", use the information
1979 * in the first block. (contains the highest speed)
1980 */
1981 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1982 if (num_spdb > 0)
1983 offset = 34;
1984 }
1985
1986 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1987 return 0;
1988}
1989
1990/* These tables from cdrecord - I don't have orange book */
1991/* standard speed CD-RW (1-4x) */
1992static char clv_to_speed[16] = {
1993 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1994 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1995};
1996/* high speed CD-RW (-10x) */
1997static char hs_clv_to_speed[16] = {
1998 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1999 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2000};
2001/* ultra high speed CD-RW */
2002static char us_clv_to_speed[16] = {
2003 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2004 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2005};
2006
2007/*
2008 * reads the maximum media speed from ATIP
2009 */
05680d86
PO		 2010static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2011 unsigned *speed)
1da177e4
LT		 2012{
2013 struct packet_command cgc;
2014 struct request_sense sense;
2015 unsigned char buf[64];
2016 unsigned int size, st, sp;
2017 int ret;
2018
2019 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2020 cgc.sense = &sense;
2021 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2022 cgc.cmd[1] = 2;
2023 cgc.cmd[2] = 4; /* READ ATIP */
2024 cgc.cmd[8] = 2;
2025 ret = pkt_generic_packet(pd, &cgc);
2026 if (ret) {
f3ded788 2027 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 2028 return ret;
2029 }
2030 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2031 if (size > sizeof(buf))
2032 size = sizeof(buf);
2033
2034 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2035 cgc.sense = &sense;
2036 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2037 cgc.cmd[1] = 2;
2038 cgc.cmd[2] = 4;
2039 cgc.cmd[8] = size;
2040 ret = pkt_generic_packet(pd, &cgc);
2041 if (ret) {
f3ded788 2042 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 2043 return ret;
2044 }
2045
eaa0ff15 2046 if (!(buf[6] & 0x40)) {
ca73dabc 2047 pkt_notice(pd, "disc type is not CD-RW\n");
1da177e4
LT		 2048 return 1;
2049 }
eaa0ff15 2050 if (!(buf[6] & 0x4)) {
ca73dabc 2051 pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
1da177e4
LT		 2052 return 1;
2053 }
2054
2055 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2056
2057 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2058
2059 /* Info from cdrecord */
2060 switch (st) {
2061 case 0: /* standard speed */
2062 *speed = clv_to_speed[sp];
2063 break;
2064 case 1: /* high speed */
2065 *speed = hs_clv_to_speed[sp];
2066 break;
2067 case 2: /* ultra high speed */
2068 *speed = us_clv_to_speed[sp];
2069 break;
2070 default:
ca73dabc 2071 pkt_notice(pd, "unknown disc sub-type %d\n", st);
1da177e4
LT		 2072 return 1;
2073 }
2074 if (*speed) {
0c075d64 2075 pkt_info(pd, "maximum media speed: %d\n", *speed);
1da177e4
LT		 2076 return 0;
2077 } else {
ca73dabc 2078 pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
1da177e4
LT		 2079 return 1;
2080 }
2081}
2082
05680d86 2083static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
1da177e4
LT		 2084{
2085 struct packet_command cgc;
2086 struct request_sense sense;
2087 int ret;
2088
844aa797 2089 pkt_dbg(2, pd, "Performing OPC\n");
1da177e4
LT		 2090
2091 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2092 cgc.sense = &sense;
2093 cgc.timeout = 60*HZ;
2094 cgc.cmd[0] = GPCMD_SEND_OPC;
2095 cgc.cmd[1] = 1;
2096 if ((ret = pkt_generic_packet(pd, &cgc)))
f3ded788 2097 pkt_dump_sense(pd, &cgc);
1da177e4
LT		 2098 return ret;
2099}
2100
2101static int pkt_open_write(struct pktcdvd_device *pd)
2102{
2103 int ret;
2104 unsigned int write_speed, media_write_speed, read_speed;
2105
2106 if ((ret = pkt_probe_settings(pd))) {
844aa797 2107 pkt_dbg(2, pd, "failed probe\n");
9db91546 2108 return ret;
1da177e4
LT		 2109 }
2110
2111 if ((ret = pkt_set_write_settings(pd))) {
844aa797 2112 pkt_dbg(1, pd, "failed saving write settings\n");
1da177e4
LT		 2113 return -EIO;
2114 }
2115
2116 pkt_write_caching(pd, USE_WCACHING);
2117
2118 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2119 write_speed = 16 * 177;
2120 switch (pd->mmc3_profile) {
2121 case 0x13: /* DVD-RW */
2122 case 0x1a: /* DVD+RW */
2123 case 0x12: /* DVD-RAM */
844aa797 2124 pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
1da177e4
LT		 2125 break;
2126 default:
2127 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2128 media_write_speed = 16;
2129 write_speed = min(write_speed, media_write_speed * 177);
844aa797 2130 pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
1da177e4
LT		 2131 break;
2132 }
2133 read_speed = write_speed;
2134
2135 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
844aa797 2136 pkt_dbg(1, pd, "couldn't set write speed\n");
1da177e4
LT		 2137 return -EIO;
2138 }
2139 pd->write_speed = write_speed;
2140 pd->read_speed = read_speed;
2141
2142 if ((ret = pkt_perform_opc(pd))) {
844aa797 2143 pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
1da177e4
LT		 2144 }
2145
2146 return 0;
2147}
2148
2149/*
2150 * called at open time.
2151 */
aeb5d727 2152static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
1da177e4
LT		 2153{
2154 int ret;
2155 long lba;
165125e1 2156 struct request_queue *q;
1da177e4
LT		 2157
2158 /*
2159 * We need to re-open the cdrom device without O_NONBLOCK to be able
2160 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2161 * so bdget() can't fail.
2162 */
2163 bdget(pd->bdev->bd_dev);
e525fd89 2164 if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd)))
1da177e4
LT		 2165 goto out;
2166
2167 if ((ret = pkt_get_last_written(pd, &lba))) {
fa63c0ab 2168 pkt_err(pd, "pkt_get_last_written failed\n");
e525fd89 2169 goto out_putdev;
1da177e4
LT		 2170 }
2171
2172 set_capacity(pd->disk, lba << 2);
2173 set_capacity(pd->bdev->bd_disk, lba << 2);
2174 bd_set_size(pd->bdev, (loff_t)lba << 11);
2175
2176 q = bdev_get_queue(pd->bdev);
2177 if (write) {
2178 if ((ret = pkt_open_write(pd)))
e525fd89 2179 goto out_putdev;
1da177e4
LT		 2180 /*
2181 * Some CDRW drives can not handle writes larger than one packet,
2182 * even if the size is a multiple of the packet size.
2183 */
2184 spin_lock_irq(q->queue_lock);
086fa5ff 2185 blk_queue_max_hw_sectors(q, pd->settings.size);
1da177e4
LT		 2186 spin_unlock_irq(q->queue_lock);
2187 set_bit(PACKET_WRITABLE, &pd->flags);
2188 } else {
2189 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2190 clear_bit(PACKET_WRITABLE, &pd->flags);
2191 }
2192
2193 if ((ret = pkt_set_segment_merging(pd, q)))
e525fd89 2194 goto out_putdev;
1da177e4 2195
e1bc89bc
PO		 2196 if (write) {
2197 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
fa63c0ab 2198 pkt_err(pd, "not enough memory for buffers\n");
e1bc89bc 2199 ret = -ENOMEM;
e525fd89 2200 goto out_putdev;
e1bc89bc 2201 }
0c075d64 2202 pkt_info(pd, "%lukB available on disc\n", lba << 1);
e1bc89bc 2203 }
1da177e4
LT		 2204
2205 return 0;
2206
2207out_putdev:
e525fd89 2208 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
1da177e4
LT		 2209out:
2210 return ret;
2211}
2212
2213/*
2214 * called when the device is closed. makes sure that the device flushes
2215 * the internal cache before we close.
2216 */
2217static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2218{
2219 if (flush && pkt_flush_cache(pd))
844aa797 2220 pkt_dbg(1, pd, "not flushing cache\n");
1da177e4
LT		 2221
2222 pkt_lock_door(pd, 0);
2223
2224 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
e525fd89 2225 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
e1bc89bc
PO		 2226
2227 pkt_shrink_pktlist(pd);
1da177e4
LT		 2228}
2229
252a52aa 2230static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
1da177e4
LT		 2231{
2232 if (dev_minor >= MAX_WRITERS)
2233 return NULL;
2234 return pkt_devs[dev_minor];
2235}
2236
5e5e007c 2237static int pkt_open(struct block_device *bdev, fmode_t mode)
1da177e4
LT		 2238{
2239 struct pktcdvd_device *pd = NULL;
2240 int ret;
2241
2a48fc0a 2242 mutex_lock(&pktcdvd_mutex);
1657f824 2243 mutex_lock(&ctl_mutex);
5e5e007c 2244 pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
1da177e4
LT		 2245 if (!pd) {
2246 ret = -ENODEV;
2247 goto out;
2248 }
2249 BUG_ON(pd->refcnt < 0);
2250
2251 pd->refcnt++;
46f4e1b7 2252 if (pd->refcnt > 1) {
5e5e007c 2253 if ((mode & FMODE_WRITE) &&
46f4e1b7
PO		 2254 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2255 ret = -EBUSY;
2256 goto out_dec;
2257 }
2258 } else {
5e5e007c 2259 ret = pkt_open_dev(pd, mode & FMODE_WRITE);
01fd9fda 2260 if (ret)
1da177e4 2261 goto out_dec;
1da177e4
LT		 2262 /*
2263 * needed here as well, since ext2 (among others) may change
2264 * the blocksize at mount time
2265 */
5e5e007c 2266 set_blocksize(bdev, CD_FRAMESIZE);
1da177e4
LT		 2267 }
2268
1657f824 2269 mutex_unlock(&ctl_mutex);
2a48fc0a 2270 mutex_unlock(&pktcdvd_mutex);
1da177e4
LT		 2271 return 0;
2272
2273out_dec:
2274 pd->refcnt--;
2275out:
1657f824 2276 mutex_unlock(&ctl_mutex);
2a48fc0a 2277 mutex_unlock(&pktcdvd_mutex);
1da177e4
LT		 2278 return ret;
2279}
2280
db2a144b 2281static void pkt_close(struct gendisk *disk, fmode_t mode)
1da177e4 2282{
5e5e007c 2283 struct pktcdvd_device *pd = disk->private_data;
1da177e4 2284
2a48fc0a 2285 mutex_lock(&pktcdvd_mutex);
1657f824 2286 mutex_lock(&ctl_mutex);
1da177e4
LT		 2287 pd->refcnt--;
2288 BUG_ON(pd->refcnt < 0);
2289 if (pd->refcnt == 0) {
2290 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2291 pkt_release_dev(pd, flush);
2292 }
1657f824 2293 mutex_unlock(&ctl_mutex);
2a48fc0a 2294 mutex_unlock(&pktcdvd_mutex);
1da177e4
LT		 2295}
2296
2297
4246a0b6 2298static void pkt_end_io_read_cloned(struct bio *bio)
1da177e4
LT		 2299{
2300 struct packet_stacked_data *psd = bio->bi_private;
2301 struct pktcdvd_device *pd = psd->pd;
2302
4e4cbee9 2303 psd->bio->bi_status = bio->bi_status;
1da177e4 2304 bio_put(bio);
4246a0b6 2305 bio_endio(psd->bio);
1da177e4
LT		 2306 mempool_free(psd, psd_pool);
2307 pkt_bio_finished(pd);
1da177e4
LT		 2308}
2309
20d0189b 2310static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
1da177e4 2311{
a1d91404 2312 struct bio *cloned_bio = bio_clone_fast(bio, GFP_NOIO, pkt_bio_set);
20d0189b
KO		 2313 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2314
2315 psd->pd = pd;
2316 psd->bio = bio;
2317 cloned_bio->bi_bdev = pd->bdev;
2318 cloned_bio->bi_private = psd;
2319 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2320 pd->stats.secs_r += bio_sectors(bio);
2321 pkt_queue_bio(pd, cloned_bio);
2322}
2323
2324static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
2325{
2326 struct pktcdvd_device *pd = q->queuedata;
1da177e4
LT		 2327 sector_t zone;
2328 struct packet_data *pkt;
2329 int was_empty, blocked_bio;
2330 struct pkt_rb_node *node;
2331
4f024f37 2332 zone = get_zone(bio->bi_iter.bi_sector, pd);
1da177e4
LT		 2333
2334 /*
2335 * If we find a matching packet in state WAITING or READ_WAIT, we can
2336 * just append this bio to that packet.
2337 */
2338 spin_lock(&pd->cdrw.active_list_lock);
2339 blocked_bio = 0;
2340 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2341 if (pkt->sector == zone) {
2342 spin_lock(&pkt->lock);
2343 if ((pkt->state == PACKET_WAITING_STATE) ||
2344 (pkt->state == PACKET_READ_WAIT_STATE)) {
c5ecc484 2345 bio_list_add(&pkt->orig_bios, bio);
4f024f37
KO		 2346 pkt->write_size +=
2347 bio->bi_iter.bi_size / CD_FRAMESIZE;
1da177e4
LT		 2348 if ((pkt->write_size >= pkt->frames) &&
2349 (pkt->state == PACKET_WAITING_STATE)) {
2350 atomic_inc(&pkt->run_sm);
2351 wake_up(&pd->wqueue);
2352 }
2353 spin_unlock(&pkt->lock);
2354 spin_unlock(&pd->cdrw.active_list_lock);
5a7bbad2 2355 return;
1da177e4
LT		 2356 } else {
2357 blocked_bio = 1;
2358 }
2359 spin_unlock(&pkt->lock);
2360 }
2361 }
2362 spin_unlock(&pd->cdrw.active_list_lock);
2363
0a0fc960
TM		 2364 /*
2365 * Test if there is enough room left in the bio work queue
2366 * (queue size >= congestion on mark).
2367 * If not, wait till the work queue size is below the congestion off mark.
2368 */
2369 spin_lock(&pd->lock);
2370 if (pd->write_congestion_on > 0
2371 && pd->bio_queue_size >= pd->write_congestion_on) {
dc3b17cc 2372 set_bdi_congested(q->backing_dev_info, BLK_RW_ASYNC);
0a0fc960
TM		 2373 do {
2374 spin_unlock(&pd->lock);
8aa7e847 2375 congestion_wait(BLK_RW_ASYNC, HZ);
0a0fc960
TM		 2376 spin_lock(&pd->lock);
2377 } while(pd->bio_queue_size > pd->write_congestion_off);
2378 }
2379 spin_unlock(&pd->lock);
2380
1da177e4
LT		 2381 /*
2382 * No matching packet found. Store the bio in the work queue.
2383 */
2384 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
1da177e4
LT		 2385 node->bio = bio;
2386 spin_lock(&pd->lock);
2387 BUG_ON(pd->bio_queue_size < 0);
2388 was_empty = (pd->bio_queue_size == 0);
2389 pkt_rbtree_insert(pd, node);
2390 spin_unlock(&pd->lock);
2391
2392 /*
2393 * Wake up the worker thread.
2394 */
2395 atomic_set(&pd->scan_queue, 1);
2396 if (was_empty) {
2397 /* This wake_up is required for correct operation */
2398 wake_up(&pd->wqueue);
2399 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2400 /*
2401 * This wake up is not required for correct operation,
2402 * but improves performance in some cases.
2403 */
2404 wake_up(&pd->wqueue);
2405 }
20d0189b
KO		 2406}
2407
dece1635 2408static blk_qc_t pkt_make_request(struct request_queue *q, struct bio *bio)
20d0189b
KO		 2409{
2410 struct pktcdvd_device *pd;
2411 char b[BDEVNAME_SIZE];
2412 struct bio *split;
2413
af67c31f 2414 blk_queue_split(q, &bio);
54efd50b 2415
20d0189b
KO		 2416 pd = q->queuedata;
2417 if (!pd) {
2418 pr_err("%s incorrect request queue\n",
2419 bdevname(bio->bi_bdev, b));
2420 goto end_io;
2421 }
2422
2423 pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
2424 (unsigned long long)bio->bi_iter.bi_sector,
2425 (unsigned long long)bio_end_sector(bio));
2426
2427 /*
2428 * Clone READ bios so we can have our own bi_end_io callback.
2429 */
2430 if (bio_data_dir(bio) == READ) {
2431 pkt_make_request_read(pd, bio);
dece1635 2432 return BLK_QC_T_NONE;
20d0189b
KO		 2433 }
2434
2435 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2436 pkt_notice(pd, "WRITE for ro device (%llu)\n",
2437 (unsigned long long)bio->bi_iter.bi_sector);
2438 goto end_io;
2439 }
2440
2441 if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
2442 pkt_err(pd, "wrong bio size\n");
2443 goto end_io;
2444 }
2445
20d0189b
KO		 2446 do {
2447 sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
2448 sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
2449
2450 if (last_zone != zone) {
2451 BUG_ON(last_zone != zone + pd->settings.size);
2452
2453 split = bio_split(bio, last_zone -
2454 bio->bi_iter.bi_sector,
a1d91404 2455 GFP_NOIO, pkt_bio_set);
20d0189b
KO		 2456 bio_chain(split, bio);
2457 } else {
2458 split = bio;
2459 }
2460
2461 pkt_make_request_write(q, split);
2462 } while (split != bio);
2463
dece1635 2464 return BLK_QC_T_NONE;
1da177e4 2465end_io:
6712ecf8 2466 bio_io_error(bio);
dece1635 2467 return BLK_QC_T_NONE;
1da177e4
LT		 2468}
2469
1da177e4
LT		 2470static void pkt_init_queue(struct pktcdvd_device *pd)
2471{
165125e1 2472 struct request_queue *q = pd->disk->queue;
1da177e4
LT		 2473
2474 blk_queue_make_request(q, pkt_make_request);
e1defc4f 2475 blk_queue_logical_block_size(q, CD_FRAMESIZE);
086fa5ff 2476 blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
1da177e4
LT		 2477 q->queuedata = pd;
2478}
2479
2480static int pkt_seq_show(struct seq_file *m, void *p)
2481{
2482 struct pktcdvd_device *pd = m->private;
2483 char *msg;
2484 char bdev_buf[BDEVNAME_SIZE];
2485 int states[PACKET_NUM_STATES];
2486
2487 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2488 bdevname(pd->bdev, bdev_buf));
2489
2490 seq_printf(m, "\nSettings:\n");
2491 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2492
2493 if (pd->settings.write_type == 0)
2494 msg = "Packet";
2495 else
2496 msg = "Unknown";
2497 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2498
2499 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2500 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2501
2502 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2503
2504 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2505 msg = "Mode 1";
2506 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2507 msg = "Mode 2";
2508 else
2509 msg = "Unknown";
2510 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2511
2512 seq_printf(m, "\nStatistics:\n");
2513 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2514 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2515 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2516 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2517 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2518
2519 seq_printf(m, "\nMisc:\n");
2520 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2521 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2522 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2523 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2524 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2525 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2526
2527 seq_printf(m, "\nQueue state:\n");
2528 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2529 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2530 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2531
2532 pkt_count_states(pd, states);
2533 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2534 states[0], states[1], states[2], states[3], states[4], states[5]);
2535
0a0fc960
TM		 2536 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2537 pd->write_congestion_off,
2538 pd->write_congestion_on);
1da177e4
LT		 2539 return 0;
2540}
2541
2542static int pkt_seq_open(struct inode *inode, struct file *file)
2543{
d9dda78b 2544 return single_open(file, pkt_seq_show, PDE_DATA(inode));
1da177e4
LT		 2545}
2546
2b8693c0 2547static const struct file_operations pkt_proc_fops = {
1da177e4
LT		 2548 .open = pkt_seq_open,
2549 .read = seq_read,
2550 .llseek = seq_lseek,
2551 .release = single_release
2552};
2553
2554static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2555{
2556 int i;
2557 int ret = 0;
2558 char b[BDEVNAME_SIZE];
1da177e4
LT		 2559 struct block_device *bdev;
2560
2561 if (pd->pkt_dev == dev) {
fa63c0ab 2562 pkt_err(pd, "recursive setup not allowed\n");
1da177e4
LT		 2563 return -EBUSY;
2564 }
2565 for (i = 0; i < MAX_WRITERS; i++) {
2566 struct pktcdvd_device *pd2 = pkt_devs[i];
2567 if (!pd2)
2568 continue;
2569 if (pd2->bdev->bd_dev == dev) {
fa63c0ab
JP		 2570 pkt_err(pd, "%s already setup\n",
2571 bdevname(pd2->bdev, b));
1da177e4
LT		 2572 return -EBUSY;
2573 }
2574 if (pd2->pkt_dev == dev) {
fa63c0ab 2575 pkt_err(pd, "can't chain pktcdvd devices\n");
1da177e4
LT		 2576 return -EBUSY;
2577 }
2578 }
2579
2580 bdev = bdget(dev);
2581 if (!bdev)
2582 return -ENOMEM;
ec2be6a9
BVA		 2583 if (!blk_queue_scsi_passthrough(bdev_get_queue(bdev))) {
2584 WARN_ONCE(true, "Attempt to register a non-SCSI queue\n");
2585 bdput(bdev);
2586 return -EINVAL;
2587 }
e525fd89 2588 ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
1da177e4
LT		 2589 if (ret)
2590 return ret;
2591
2592 /* This is safe, since we have a reference from open(). */
2593 __module_get(THIS_MODULE);
2594
1da177e4
LT		 2595 pd->bdev = bdev;
2596 set_blocksize(bdev, CD_FRAMESIZE);
2597
2598 pkt_init_queue(pd);
2599
2600 atomic_set(&pd->cdrw.pending_bios, 0);
2601 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2602 if (IS_ERR(pd->cdrw.thread)) {
fa63c0ab 2603 pkt_err(pd, "can't start kernel thread\n");
1da177e4 2604 ret = -ENOMEM;
e1bc89bc 2605 goto out_mem;
1da177e4
LT		 2606 }
2607
c7705f34 2608 proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
844aa797 2609 pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b));
1da177e4
LT		 2610 return 0;
2611
1da177e4 2612out_mem:
2cbed890 2613 blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
1da177e4
LT		 2614 /* This is safe: open() is still holding a reference. */
2615 module_put(THIS_MODULE);
2616 return ret;
2617}
2618
5e5e007c 2619static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
1da177e4 2620{
5e5e007c 2621 struct pktcdvd_device *pd = bdev->bd_disk->private_data;
8a6cfeb6 2622 int ret;
1da177e4 2623
844aa797 2624 pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
cd3f2cd0 2625 cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
1da177e4 2626
2a48fc0a 2627 mutex_lock(&pktcdvd_mutex);
1da177e4 2628 switch (cmd) {
a0eb62a0
AV		 2629 case CDROMEJECT:
2630 /*
2631 * The door gets locked when the device is opened, so we
2632 * have to unlock it or else the eject command fails.
2633 */
2634 if (pd->refcnt == 1)
2635 pkt_lock_door(pd, 0);
2636 /* fallthru */
1da177e4
LT		 2637 /*
2638 * forward selected CDROM ioctls to CD-ROM, for UDF
2639 */
2640 case CDROMMULTISESSION:
2641 case CDROMREADTOCENTRY:
2642 case CDROM_LAST_WRITTEN:
2643 case CDROM_SEND_PACKET:
2644 case SCSI_IOCTL_SEND_COMMAND:
8a6cfeb6
AB		 2645 ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
2646 break;
1da177e4
LT		 2647
2648 default:
844aa797 2649 pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
8a6cfeb6 2650 ret = -ENOTTY;
1da177e4 2651 }
2a48fc0a 2652 mutex_unlock(&pktcdvd_mutex);
8560c650 2653
8a6cfeb6 2654 return ret;
1da177e4
LT		 2655}
2656
3c0d2060
TH		 2657static unsigned int pkt_check_events(struct gendisk *disk,
2658 unsigned int clearing)
1da177e4
LT		 2659{
2660 struct pktcdvd_device *pd = disk->private_data;
2661 struct gendisk *attached_disk;
2662
2663 if (!pd)
2664 return 0;
2665 if (!pd->bdev)
2666 return 0;
2667 attached_disk = pd->bdev->bd_disk;
3c0d2060 2668 if (!attached_disk || !attached_disk->fops->check_events)
1da177e4 2669 return 0;
3c0d2060 2670 return attached_disk->fops->check_events(attached_disk, clearing);
1da177e4
LT		 2671}
2672
83d5cde4 2673static const struct block_device_operations pktcdvd_ops = {
1da177e4 2674 .owner = THIS_MODULE,
5e5e007c
AV		 2675 .open = pkt_open,
2676 .release = pkt_close,
8a6cfeb6 2677 .ioctl = pkt_ioctl,
3c0d2060 2678 .check_events = pkt_check_events,
1da177e4
LT		 2679};
2680
2c9ede55 2681static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode)
b03f38b6
KS		 2682{
2683 return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name);
2684}
2685
1da177e4
LT		 2686/*
2687 * Set up mapping from pktcdvd device to CD-ROM device.
2688 */
adb9250a 2689static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
1da177e4
LT		 2690{
2691 int idx;
2692 int ret = -ENOMEM;
2693 struct pktcdvd_device *pd;
2694 struct gendisk *disk;
adb9250a
TM		 2695
2696 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
1da177e4
LT		 2697
2698 for (idx = 0; idx < MAX_WRITERS; idx++)
2699 if (!pkt_devs[idx])
2700 break;
2701 if (idx == MAX_WRITERS) {
99481334 2702 pr_err("max %d writers supported\n", MAX_WRITERS);
adb9250a
TM		 2703 ret = -EBUSY;
2704 goto out_mutex;
1da177e4
LT		 2705 }
2706
1107d2e0 2707 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
1da177e4 2708 if (!pd)
adb9250a 2709 goto out_mutex;
1da177e4 2710
0eaae62a
MD		 2711 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2712 sizeof(struct pkt_rb_node));
1da177e4
LT		 2713 if (!pd->rb_pool)
2714 goto out_mem;
2715
e1bc89bc
PO		 2716 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2717 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2718 spin_lock_init(&pd->cdrw.active_list_lock);
2719
1da177e4
LT		 2720 spin_lock_init(&pd->lock);
2721 spin_lock_init(&pd->iosched.lock);
c5ecc484
AM		 2722 bio_list_init(&pd->iosched.read_queue);
2723 bio_list_init(&pd->iosched.write_queue);
7822082d 2724 sprintf(pd->name, DRIVER_NAME"%d", idx);
1da177e4
LT		 2725 init_waitqueue_head(&pd->wqueue);
2726 pd->bio_queue = RB_ROOT;
2727
0a0fc960
TM		 2728 pd->write_congestion_on = write_congestion_on;
2729 pd->write_congestion_off = write_congestion_off;
2730
adb9250a
TM		 2731 disk = alloc_disk(1);
2732 if (!disk)
2733 goto out_mem;
2734 pd->disk = disk;
add21660 2735 disk->major = pktdev_major;
1da177e4
LT		 2736 disk->first_minor = idx;
2737 disk->fops = &pktcdvd_ops;
2738 disk->flags = GENHD_FL_REMOVABLE;
adb9250a 2739 strcpy(disk->disk_name, pd->name);
e454cea2 2740 disk->devnode = pktcdvd_devnode;
1da177e4
LT		 2741 disk->private_data = pd;
2742 disk->queue = blk_alloc_queue(GFP_KERNEL);
2743 if (!disk->queue)
2744 goto out_mem2;
2745
f331c029 2746 pd->pkt_dev = MKDEV(pktdev_major, idx);
1da177e4
LT		 2747 ret = pkt_new_dev(pd, dev);
2748 if (ret)
2749 goto out_new_dev;
2750
3c0d2060
TH		 2751 /* inherit events of the host device */
2752 disk->events = pd->bdev->bd_disk->events;
2753 disk->async_events = pd->bdev->bd_disk->async_events;
2754
1da177e4 2755 add_disk(disk);
adb9250a 2756
32694850
TM		 2757 pkt_sysfs_dev_new(pd);
2758 pkt_debugfs_dev_new(pd);
2759
1da177e4 2760 pkt_devs[idx] = pd;
adb9250a
TM		 2761 if (pkt_dev)
2762 *pkt_dev = pd->pkt_dev;
2763
2764 mutex_unlock(&ctl_mutex);
1da177e4
LT		 2765 return 0;
2766
2767out_new_dev:
1312f40e 2768 blk_cleanup_queue(disk->queue);
1da177e4
LT		 2769out_mem2:
2770 put_disk(disk);
2771out_mem:
0220531a 2772 mempool_destroy(pd->rb_pool);
1da177e4 2773 kfree(pd);
adb9250a
TM		 2774out_mutex:
2775 mutex_unlock(&ctl_mutex);
99481334 2776 pr_err("setup of pktcdvd device failed\n");
1da177e4
LT		 2777 return ret;
2778}
2779
2780/*
2781 * Tear down mapping from pktcdvd device to CD-ROM device.
2782 */
adb9250a 2783static int pkt_remove_dev(dev_t pkt_dev)
1da177e4
LT		 2784{
2785 struct pktcdvd_device *pd;
2786 int idx;
adb9250a
TM		 2787 int ret = 0;
2788
2789 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
1da177e4
LT		 2790
2791 for (idx = 0; idx < MAX_WRITERS; idx++) {
2792 pd = pkt_devs[idx];
2793 if (pd && (pd->pkt_dev == pkt_dev))
2794 break;
2795 }
2796 if (idx == MAX_WRITERS) {
666dc7c9 2797 pr_debug("dev not setup\n");
adb9250a
TM		 2798 ret = -ENXIO;
2799 goto out;
1da177e4
LT		 2800 }
2801
adb9250a
TM		 2802 if (pd->refcnt > 0) {
2803 ret = -EBUSY;
2804 goto out;
2805 }
1da177e4
LT		 2806 if (!IS_ERR(pd->cdrw.thread))
2807 kthread_stop(pd->cdrw.thread);
2808
32694850
TM		 2809 pkt_devs[idx] = NULL;
2810
2811 pkt_debugfs_dev_remove(pd);
2812 pkt_sysfs_dev_remove(pd);
2813
2cbed890 2814 blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
1da177e4 2815
1da177e4 2816 remove_proc_entry(pd->name, pkt_proc);
844aa797 2817 pkt_dbg(1, pd, "writer unmapped\n");
1da177e4
LT		 2818
2819 del_gendisk(pd->disk);
1312f40e 2820 blk_cleanup_queue(pd->disk->queue);
1da177e4
LT		 2821 put_disk(pd->disk);
2822
1da177e4
LT		 2823 mempool_destroy(pd->rb_pool);
2824 kfree(pd);
2825
2826 /* This is safe: open() is still holding a reference. */
2827 module_put(THIS_MODULE);
adb9250a
TM		 2828
2829out:
2830 mutex_unlock(&ctl_mutex);
2831 return ret;
1da177e4
LT		 2832}
2833
2834static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2835{
adb9250a
TM		 2836 struct pktcdvd_device *pd;
2837
2838 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2839
2840 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
1da177e4
LT		 2841 if (pd) {
2842 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2843 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2844 } else {
2845 ctrl_cmd->dev = 0;
2846 ctrl_cmd->pkt_dev = 0;
2847 }
2848 ctrl_cmd->num_devices = MAX_WRITERS;
adb9250a
TM		 2849
2850 mutex_unlock(&ctl_mutex);
1da177e4
LT		 2851}
2852
f80a0ca6 2853static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4
LT		 2854{
2855 void __user *argp = (void __user *)arg;
2856 struct pkt_ctrl_command ctrl_cmd;
2857 int ret = 0;
adb9250a 2858 dev_t pkt_dev = 0;
1da177e4
LT		 2859
2860 if (cmd != PACKET_CTRL_CMD)
2861 return -ENOTTY;
2862
2863 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2864 return -EFAULT;
2865
2866 switch (ctrl_cmd.command) {
2867 case PKT_CTRL_CMD_SETUP:
2868 if (!capable(CAP_SYS_ADMIN))
2869 return -EPERM;
adb9250a
TM		 2870 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
2871 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
1da177e4
LT		 2872 break;
2873 case PKT_CTRL_CMD_TEARDOWN:
2874 if (!capable(CAP_SYS_ADMIN))
2875 return -EPERM;
adb9250a 2876 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
1da177e4
LT		 2877 break;
2878 case PKT_CTRL_CMD_STATUS:
1da177e4 2879 pkt_get_status(&ctrl_cmd);
1da177e4
LT		 2880 break;
2881 default:
2882 return -ENOTTY;
2883 }
2884
2885 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2886 return -EFAULT;
2887 return ret;
2888}
2889
f80a0ca6
AB		 2890#ifdef CONFIG_COMPAT
2891static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2892{
2893 return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2894}
2895#endif
1da177e4 2896
2b8693c0 2897static const struct file_operations pkt_ctl_fops = {
f80a0ca6
AB		 2898 .open = nonseekable_open,
2899 .unlocked_ioctl = pkt_ctl_ioctl,
2900#ifdef CONFIG_COMPAT
2901 .compat_ioctl = pkt_ctl_compat_ioctl,
2902#endif
2903 .owner = THIS_MODULE,
6038f373 2904 .llseek = no_llseek,
1da177e4
LT		 2905};
2906
2907static struct miscdevice pkt_misc = {
2908 .minor = MISC_DYNAMIC_MINOR,
7822082d 2909 .name = DRIVER_NAME,
e454cea2 2910 .nodename = "pktcdvd/control",
1da177e4
LT		 2911 .fops = &pkt_ctl_fops
2912};
2913
2914static int __init pkt_init(void)
2915{
2916 int ret;
2917
32694850
TM		 2918 mutex_init(&ctl_mutex);
2919
0eaae62a
MD		 2920 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
2921 sizeof(struct packet_stacked_data));
1da177e4
LT		 2922 if (!psd_pool)
2923 return -ENOMEM;
a1d91404
N		 2924 pkt_bio_set = bioset_create(BIO_POOL_SIZE, 0, 0);
2925 if (!pkt_bio_set) {
2926 mempool_destroy(psd_pool);
2927 return -ENOMEM;
2928 }
1da177e4 2929
add21660 2930 ret = register_blkdev(pktdev_major, DRIVER_NAME);
1da177e4 2931 if (ret < 0) {
99481334 2932 pr_err("unable to register block device\n");
1da177e4
LT		 2933 goto out2;
2934 }
add21660
TM		 2935 if (!pktdev_major)
2936 pktdev_major = ret;
1da177e4 2937
32694850
TM		 2938 ret = pkt_sysfs_init();
2939 if (ret)
2940 goto out;
2941
2942 pkt_debugfs_init();
2943
1da177e4
LT		 2944 ret = misc_register(&pkt_misc);
2945 if (ret) {
99481334 2946 pr_err("unable to register misc device\n");
32694850 2947 goto out_misc;
1da177e4
LT		 2948 }
2949
928b4d8c 2950 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
1da177e4 2951
1da177e4
LT		 2952 return 0;
2953
32694850
TM		 2954out_misc:
2955 pkt_debugfs_cleanup();
2956 pkt_sysfs_cleanup();
1da177e4 2957out:
add21660 2958 unregister_blkdev(pktdev_major, DRIVER_NAME);
1da177e4
LT		 2959out2:
2960 mempool_destroy(psd_pool);
a1d91404 2961 bioset_free(pkt_bio_set);
1da177e4
LT		 2962 return ret;
2963}
2964
2965static void __exit pkt_exit(void)
2966{
928b4d8c 2967 remove_proc_entry("driver/"DRIVER_NAME, NULL);
1da177e4 2968 misc_deregister(&pkt_misc);
32694850
TM		 2969
2970 pkt_debugfs_cleanup();
2971 pkt_sysfs_cleanup();
2972
add21660 2973 unregister_blkdev(pktdev_major, DRIVER_NAME);
1da177e4 2974 mempool_destroy(psd_pool);
a1d91404 2975 bioset_free(pkt_bio_set);
1da177e4
LT		 2976}
2977
2978MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2979MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2980MODULE_LICENSE("GPL");
2981
2982module_init(pkt_init);
2983module_exit(pkt_exit);
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