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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
Thomas Maieradb92502006-12-08 02:36:10 -08004 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
8 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -07009 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
10 * DVD-RAM devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * Theory of operation:
13 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -070014 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -070023 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 *
45 *************************************************************************/
46
Joe Perches99481332013-09-11 14:25:52 -070047#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/pktcdvd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/module.h>
51#include <linux/types.h>
52#include <linux/kernel.h>
Arnd Bergmannf80a0ca2010-04-28 14:36:41 +020053#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#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>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080061#include <linux/freezer.h>
Jes Sorensen1657f822006-03-23 03:00:25 -080062#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090063#include <linux/slab.h>
Tejun Heo66114ca2015-05-22 17:13:32 -040064#include <linux/backing-dev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <scsi/scsi_cmnd.h>
66#include <scsi/scsi_ioctl.h>
Peter Osterlundcef289632006-02-20 18:28:01 -080067#include <scsi/scsi.h>
Thomas Maier32694852006-12-08 02:36:12 -080068#include <linux/debugfs.h>
69#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#include <asm/uaccess.h>
72
Thomas Maier78220822006-10-04 02:15:28 -070073#define DRIVER_NAME "pktcdvd"
74
Joe Perchesfa63c0a2013-09-11 14:25:55 -070075#define pkt_err(pd, fmt, ...) \
76 pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
Joe Perchesca73dab2013-09-11 14:25:56 -070077#define pkt_notice(pd, fmt, ...) \
78 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
Joe Perches0c075d62013-09-11 14:25:57 -070079#define pkt_info(pd, fmt, ...) \
80 pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
Joe Perchesfa63c0a2013-09-11 14:25:55 -070081
Joe Perches844aa792013-09-11 14:25:54 -070082#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__); \
Joe Perchescd3f2cd2013-09-11 14:25:53 -070089} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91#define MAX_SPEED 0xffff
92
Arnd Bergmann2a48fc02010-06-02 14:28:52 +020093static DEFINE_MUTEX(pktcdvd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
95static struct proc_dir_entry *pkt_proc;
Thomas Maieradd21662006-10-04 02:15:30 -070096static int pktdev_major;
Thomas Maier0a0fc962006-12-08 02:36:11 -080097static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
98static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
Jes Sorensen1657f822006-03-23 03:00:25 -080099static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static mempool_t *psd_pool;
101
Thomas Maier32694852006-12-08 02:36:12 -0800102static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
GeunSik Limea5ffff2009-09-07 21:39:25 +0900103static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
Thomas Maier32694852006-12-08 02:36:12 -0800104
105/* forward declaration */
106static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
107static int pkt_remove_dev(dev_t pkt_dev);
108static int pkt_seq_show(struct seq_file *m, void *p);
109
Joe Perches5323fb72013-09-11 14:25:51 -0700110static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
111{
112 return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
113}
Thomas Maier32694852006-12-08 02:36:12 -0800114
115/*
116 * create and register a pktcdvd kernel object.
117 */
118static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
119 const char* name,
120 struct kobject* parent,
121 struct kobj_type* ktype)
122{
123 struct pktcdvd_kobj *p;
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400124 int error;
125
Thomas Maier32694852006-12-08 02:36:12 -0800126 p = kzalloc(sizeof(*p), GFP_KERNEL);
127 if (!p)
128 return NULL;
Thomas Maier32694852006-12-08 02:36:12 -0800129 p->pd = pd;
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400130 error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
131 if (error) {
Dave Youngd17a18d2007-12-17 16:20:00 -0800132 kobject_put(&p->kobj);
Thomas Maier32694852006-12-08 02:36:12 -0800133 return NULL;
Dave Youngd17a18d2007-12-17 16:20:00 -0800134 }
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400135 kobject_uevent(&p->kobj, KOBJ_ADD);
Thomas Maier32694852006-12-08 02:36:12 -0800136 return p;
137}
138/*
139 * remove a pktcdvd kernel object.
140 */
141static void pkt_kobj_remove(struct pktcdvd_kobj *p)
142{
143 if (p)
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800144 kobject_put(&p->kobj);
Thomas Maier32694852006-12-08 02:36:12 -0800145}
146/*
147 * default release function for pktcdvd kernel objects.
148 */
149static void pkt_kobj_release(struct kobject *kobj)
150{
151 kfree(to_pktcdvdkobj(kobj));
152}
153
154
155/**********************************************************
156 *
157 * sysfs interface for pktcdvd
158 * by (C) 2006 Thomas Maier <balagi@justmail.de>
159 *
160 **********************************************************/
161
162#define DEF_ATTR(_obj,_name,_mode) \
Tejun Heo7b595752007-06-14 03:45:17 +0900163 static struct attribute _obj = { .name = _name, .mode = _mode }
Thomas Maier32694852006-12-08 02:36:12 -0800164
165/**********************************************************
166 /sys/class/pktcdvd/pktcdvd[0-7]/
167 stat/reset
168 stat/packets_started
169 stat/packets_finished
170 stat/kb_written
171 stat/kb_read
172 stat/kb_read_gather
173 write_queue/size
174 write_queue/congestion_off
175 write_queue/congestion_on
176 **********************************************************/
177
178DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
179DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
180DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
181DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
182DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
183DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
184
185static struct attribute *kobj_pkt_attrs_stat[] = {
186 &kobj_pkt_attr_st1,
187 &kobj_pkt_attr_st2,
188 &kobj_pkt_attr_st3,
189 &kobj_pkt_attr_st4,
190 &kobj_pkt_attr_st5,
191 &kobj_pkt_attr_st6,
192 NULL
193};
194
195DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
196DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
197DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
198
199static struct attribute *kobj_pkt_attrs_wqueue[] = {
200 &kobj_pkt_attr_wq1,
201 &kobj_pkt_attr_wq2,
202 &kobj_pkt_attr_wq3,
203 NULL
204};
205
Thomas Maier32694852006-12-08 02:36:12 -0800206static ssize_t kobj_pkt_show(struct kobject *kobj,
207 struct attribute *attr, char *data)
208{
209 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
210 int n = 0;
211 int v;
212 if (strcmp(attr->name, "packets_started") == 0) {
213 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
214
215 } else if (strcmp(attr->name, "packets_finished") == 0) {
216 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
217
218 } else if (strcmp(attr->name, "kb_written") == 0) {
219 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
220
221 } else if (strcmp(attr->name, "kb_read") == 0) {
222 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
223
224 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
225 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
226
227 } else if (strcmp(attr->name, "size") == 0) {
228 spin_lock(&pd->lock);
229 v = pd->bio_queue_size;
230 spin_unlock(&pd->lock);
231 n = sprintf(data, "%d\n", v);
232
233 } else if (strcmp(attr->name, "congestion_off") == 0) {
234 spin_lock(&pd->lock);
235 v = pd->write_congestion_off;
236 spin_unlock(&pd->lock);
237 n = sprintf(data, "%d\n", v);
238
239 } else if (strcmp(attr->name, "congestion_on") == 0) {
240 spin_lock(&pd->lock);
241 v = pd->write_congestion_on;
242 spin_unlock(&pd->lock);
243 n = sprintf(data, "%d\n", v);
244 }
245 return n;
246}
247
248static void init_write_congestion_marks(int* lo, int* hi)
249{
250 if (*hi > 0) {
251 *hi = max(*hi, 500);
252 *hi = min(*hi, 1000000);
253 if (*lo <= 0)
254 *lo = *hi - 100;
255 else {
256 *lo = min(*lo, *hi - 100);
257 *lo = max(*lo, 100);
258 }
259 } else {
260 *hi = -1;
261 *lo = -1;
262 }
263}
264
265static ssize_t kobj_pkt_store(struct kobject *kobj,
266 struct attribute *attr,
267 const char *data, size_t len)
268{
269 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
270 int val;
Thomas Maier32694852006-12-08 02:36:12 -0800271
Thomas Maier83f3aa32007-02-10 01:45:11 -0800272 if (strcmp(attr->name, "reset") == 0 && len > 0) {
Thomas Maier32694852006-12-08 02:36:12 -0800273 pd->stats.pkt_started = 0;
274 pd->stats.pkt_ended = 0;
275 pd->stats.secs_w = 0;
276 pd->stats.secs_rg = 0;
277 pd->stats.secs_r = 0;
278
279 } else if (strcmp(attr->name, "congestion_off") == 0
Thomas Maier83f3aa32007-02-10 01:45:11 -0800280 && sscanf(data, "%d", &val) == 1) {
Thomas Maier32694852006-12-08 02:36:12 -0800281 spin_lock(&pd->lock);
282 pd->write_congestion_off = val;
283 init_write_congestion_marks(&pd->write_congestion_off,
284 &pd->write_congestion_on);
285 spin_unlock(&pd->lock);
286
287 } else if (strcmp(attr->name, "congestion_on") == 0
Thomas Maier83f3aa32007-02-10 01:45:11 -0800288 && sscanf(data, "%d", &val) == 1) {
Thomas Maier32694852006-12-08 02:36:12 -0800289 spin_lock(&pd->lock);
290 pd->write_congestion_on = val;
291 init_write_congestion_marks(&pd->write_congestion_off,
292 &pd->write_congestion_on);
293 spin_unlock(&pd->lock);
294 }
295 return len;
296}
297
Emese Revfy52cf25d2010-01-19 02:58:23 +0100298static const struct sysfs_ops kobj_pkt_ops = {
Thomas Maier32694852006-12-08 02:36:12 -0800299 .show = kobj_pkt_show,
300 .store = kobj_pkt_store
301};
302static struct kobj_type kobj_pkt_type_stat = {
303 .release = pkt_kobj_release,
304 .sysfs_ops = &kobj_pkt_ops,
305 .default_attrs = kobj_pkt_attrs_stat
306};
307static struct kobj_type kobj_pkt_type_wqueue = {
308 .release = pkt_kobj_release,
309 .sysfs_ops = &kobj_pkt_ops,
310 .default_attrs = kobj_pkt_attrs_wqueue
311};
312
313static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
314{
315 if (class_pktcdvd) {
Kay Sieverscba76712008-12-06 04:38:11 +0100316 pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,
Greg Kroah-Hartman1ff9f542008-07-21 20:03:34 -0700317 "%s", pd->name);
Tony Jones6013c122007-09-25 02:03:03 +0200318 if (IS_ERR(pd->dev))
319 pd->dev = NULL;
Thomas Maier32694852006-12-08 02:36:12 -0800320 }
Tony Jones6013c122007-09-25 02:03:03 +0200321 if (pd->dev) {
Thomas Maier32694852006-12-08 02:36:12 -0800322 pd->kobj_stat = pkt_kobj_create(pd, "stat",
Tony Jones6013c122007-09-25 02:03:03 +0200323 &pd->dev->kobj,
Thomas Maier32694852006-12-08 02:36:12 -0800324 &kobj_pkt_type_stat);
325 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
Tony Jones6013c122007-09-25 02:03:03 +0200326 &pd->dev->kobj,
Thomas Maier32694852006-12-08 02:36:12 -0800327 &kobj_pkt_type_wqueue);
328 }
329}
330
331static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
332{
333 pkt_kobj_remove(pd->kobj_stat);
334 pkt_kobj_remove(pd->kobj_wqueue);
335 if (class_pktcdvd)
Thadeu Lima de Souza Cascardoca0bf642010-02-02 13:44:17 -0800336 device_unregister(pd->dev);
Thomas Maier32694852006-12-08 02:36:12 -0800337}
338
339
340/********************************************************************
341 /sys/class/pktcdvd/
342 add map block device
343 remove unmap packet dev
344 device_map show mappings
345 *******************************************************************/
346
347static void class_pktcdvd_release(struct class *cls)
348{
349 kfree(cls);
350}
Andi Kleen28812fe2010-01-05 12:48:07 +0100351static ssize_t class_pktcdvd_show_map(struct class *c,
352 struct class_attribute *attr,
353 char *data)
Thomas Maier32694852006-12-08 02:36:12 -0800354{
355 int n = 0;
356 int idx;
357 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
358 for (idx = 0; idx < MAX_WRITERS; idx++) {
359 struct pktcdvd_device *pd = pkt_devs[idx];
360 if (!pd)
361 continue;
362 n += sprintf(data+n, "%s %u:%u %u:%u\n",
363 pd->name,
364 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
365 MAJOR(pd->bdev->bd_dev),
366 MINOR(pd->bdev->bd_dev));
367 }
368 mutex_unlock(&ctl_mutex);
369 return n;
370}
371
Andi Kleen28812fe2010-01-05 12:48:07 +0100372static ssize_t class_pktcdvd_store_add(struct class *c,
373 struct class_attribute *attr,
374 const char *buf,
Thomas Maier32694852006-12-08 02:36:12 -0800375 size_t count)
376{
377 unsigned int major, minor;
Tejun Heofffe4872007-11-08 08:00:24 +0100378
Thomas Maier83f3aa32007-02-10 01:45:11 -0800379 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
Tejun Heofffe4872007-11-08 08:00:24 +0100380 /* pkt_setup_dev() expects caller to hold reference to self */
381 if (!try_module_get(THIS_MODULE))
382 return -ENODEV;
383
Thomas Maier32694852006-12-08 02:36:12 -0800384 pkt_setup_dev(MKDEV(major, minor), NULL);
Tejun Heofffe4872007-11-08 08:00:24 +0100385
386 module_put(THIS_MODULE);
387
Thomas Maier32694852006-12-08 02:36:12 -0800388 return count;
389 }
Tejun Heofffe4872007-11-08 08:00:24 +0100390
Thomas Maier32694852006-12-08 02:36:12 -0800391 return -EINVAL;
392}
393
Andi Kleen28812fe2010-01-05 12:48:07 +0100394static ssize_t class_pktcdvd_store_remove(struct class *c,
395 struct class_attribute *attr,
396 const char *buf,
Thomas Maier32694852006-12-08 02:36:12 -0800397 size_t count)
398{
399 unsigned int major, minor;
Thomas Maier83f3aa32007-02-10 01:45:11 -0800400 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
Thomas Maier32694852006-12-08 02:36:12 -0800401 pkt_remove_dev(MKDEV(major, minor));
402 return count;
403 }
404 return -EINVAL;
405}
406
407static struct class_attribute class_pktcdvd_attrs[] = {
408 __ATTR(add, 0200, NULL, class_pktcdvd_store_add),
409 __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
410 __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
411 __ATTR_NULL
412};
413
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;
429 class_pktcdvd->class_attrs = class_pktcdvd_attrs;
430 ret = class_register(class_pktcdvd);
431 if (ret) {
432 kfree(class_pktcdvd);
433 class_pktcdvd = NULL;
Joe Perches99481332013-09-11 14:25:52 -0700434 pr_err("failed to create class pktcdvd\n");
Thomas Maier32694852006-12-08 02:36:12 -0800435 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
GeunSik Lim156f5a72009-06-02 15:01:37 +0900450 /sys/kernel/debug/pktcdvd[0-7]/
Thomas Maier32694852006-12-08 02:36:12 -0800451 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
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800465static const struct file_operations debug_fops = {
Thomas Maier32694852006-12-08 02:36:12 -0800466 .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;
Thomas Maier32694852006-12-08 02:36:12 -0800477 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
Dan Carpenter49c28562013-11-06 09:24:02 +0100478 if (!pd->dfs_d_root)
Thomas Maier32694852006-12-08 02:36:12 -0800479 return;
Dan Carpenter49c28562013-11-06 09:24:02 +0100480
Thomas Maier32694852006-12-08 02:36:12 -0800481 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
482 pd->dfs_d_root, pd, &debug_fops);
Thomas Maier32694852006-12-08 02:36:12 -0800483}
484
485static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
486{
487 if (!pkt_debugfs_root)
488 return;
Dan Carpenter49c28562013-11-06 09:24:02 +0100489 debugfs_remove(pd->dfs_f_info);
490 debugfs_remove(pd->dfs_d_root);
Thomas Maier32694852006-12-08 02:36:12 -0800491 pd->dfs_f_info = NULL;
Thomas Maier32694852006-12-08 02:36:12 -0800492 pd->dfs_d_root = NULL;
493}
494
495static void pkt_debugfs_init(void)
496{
497 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
Thomas Maier32694852006-12-08 02:36:12 -0800498}
499
500static void pkt_debugfs_cleanup(void)
501{
Thomas Maier32694852006-12-08 02:36:12 -0800502 debugfs_remove(pkt_debugfs_root);
503 pkt_debugfs_root = NULL;
504}
505
506/* ----------------------------------------------------------*/
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
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)) {
Joe Perches844aa792013-09-11 14:25:54 -0700513 pkt_dbg(2, pd, "queue empty\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 atomic_set(&pd->iosched.attention, 1);
515 wake_up(&pd->wqueue);
516 }
517}
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519/*
520 * Allocate a packet_data struct
521 */
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800522static struct packet_data *pkt_alloc_packet_data(int frames)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
524 int i;
525 struct packet_data *pkt;
526
Peter Osterlund1107d2e2005-09-13 01:25:29 -0700527 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 if (!pkt)
529 goto no_pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800531 pkt->frames = frames;
Kent Overstreetccc5c9c2012-09-07 13:44:02 -0700532 pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (!pkt->w_bio)
534 goto no_bio;
535
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800536 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 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);
Akinobu Mitac5ecc482010-02-24 08:30:08 +0100543 bio_list_init(&pkt->orig_bios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800545 for (i = 0; i < frames; i++) {
Kent Overstreetccc5c9c2012-09-07 13:44:02 -0700546 struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (!bio)
548 goto no_rd_bio;
Kent Overstreetccc5c9c2012-09-07 13:44:02 -0700549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 pkt->r_bios[i] = bio;
551 }
552
553 return pkt;
554
555no_rd_bio:
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800556 for (i = 0; i < frames; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 struct bio *bio = pkt->r_bios[i];
558 if (bio)
559 bio_put(bio);
560 }
561
562no_page:
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800563 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 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
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800580 for (i = 0; i < pkt->frames; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 struct bio *bio = pkt->r_bios[i];
582 if (bio)
583 bio_put(bio);
584 }
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800585 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 __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 }
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800600 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
603static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
604{
605 struct packet_data *pkt;
606
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800607 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 while (nr_packets > 0) {
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800610 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623static 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
Peter Osterlundac893962006-01-14 13:21:32 -0800631static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
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);
Kent Overstreet4f024f32013-10-11 15:44:27 -0700655 if (s <= tmp->bio->bi_iter.bi_sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 next = n->rb_left;
657 else
658 next = n->rb_right;
659 if (!next)
660 break;
661 n = next;
662 }
663
Kent Overstreet4f024f32013-10-11 15:44:27 -0700664 if (s > tmp->bio->bi_iter.bi_sector) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 tmp = pkt_rbtree_next(tmp);
666 if (!tmp)
667 return NULL;
668 }
Kent Overstreet4f024f32013-10-11 15:44:27 -0700669 BUG_ON(s > tmp->bio->bi_iter.bi_sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 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;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700680 sector_t s = node->bio->bi_iter.bi_sector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 struct pkt_rb_node *tmp;
682
683 while (*p) {
684 parent = *p;
685 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
Kent Overstreet4f024f32013-10-11 15:44:27 -0700686 if (s < tmp->bio->bi_iter.bi_sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 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
696/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 * 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{
Jens Axboe165125e2007-07-24 09:28:11 +0200702 struct request_queue *q = bdev_get_queue(pd->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 struct request *rq;
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800704 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800706 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
Mel Gorman71baba42015-11-06 16:28:28 -0800707 WRITE : READ, __GFP_RECLAIM);
Joe Lawrencea492f072014-08-28 08:15:21 -0600708 if (IS_ERR(rq))
709 return PTR_ERR(rq);
Jens Axboef27b0872014-06-06 07:57:37 -0600710 blk_rq_set_block_pc(rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800712 if (cgc->buflen) {
Julia Lawall8586ea92013-12-29 23:47:21 +0100713 ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
Mel Gorman71baba42015-11-06 16:28:28 -0800714 __GFP_RECLAIM);
Julia Lawall8586ea92013-12-29 23:47:21 +0100715 if (ret)
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800716 goto out;
717 }
718
Gerhard Dirschl91e4ee32007-02-20 13:57:56 -0800719 rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800720 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 rq->timeout = 60*HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (cgc->quiet)
Jens Axboe4aff5e22006-08-10 08:44:47 +0200724 rq->cmd_flags |= REQ_QUIET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800726 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
Andrew Mortoncbc31a42007-04-25 13:01:21 -0700727 if (rq->errors)
728 ret = -EIO;
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800729out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 blk_put_request(rq);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800731 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
Joe Perches99481332013-09-11 14:25:52 -0700734static const char *sense_key_string(__u8 index)
735{
736 static const char * const info[] = {
737 "No sense", "Recovered error", "Not ready",
738 "Medium error", "Hardware error", "Illegal request",
739 "Unit attention", "Data protect", "Blank check",
740 };
741
742 return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
743}
744
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745/*
746 * A generic sense dump / resolve mechanism should be implemented across
747 * all ATAPI + SCSI devices.
748 */
Joe Perchesf3ded782013-09-11 14:25:58 -0700749static void pkt_dump_sense(struct pktcdvd_device *pd,
750 struct packet_command *cgc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 struct request_sense *sense = cgc->sense;
753
Joe Perches99481332013-09-11 14:25:52 -0700754 if (sense)
Joe Perchesf3ded782013-09-11 14:25:58 -0700755 pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
756 CDROM_PACKET_SIZE, cgc->cmd,
757 sense->sense_key, sense->asc, sense->ascq,
758 sense_key_string(sense->sense_key));
Joe Perches99481332013-09-11 14:25:52 -0700759 else
Joe Perchesf3ded782013-09-11 14:25:58 -0700760 pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761}
762
763/*
764 * flush the drive cache to media
765 */
766static int pkt_flush_cache(struct pktcdvd_device *pd)
767{
768 struct packet_command cgc;
769
770 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
771 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
772 cgc.quiet = 1;
773
774 /*
775 * the IMMED bit -- we default to not setting it, although that
776 * would allow a much faster close, this is safer
777 */
778#if 0
779 cgc.cmd[1] = 1 << 1;
780#endif
781 return pkt_generic_packet(pd, &cgc);
782}
783
784/*
785 * speed is given as the normal factor, e.g. 4 for 4x
786 */
Peter Osterlund05680d82008-03-04 14:28:41 -0800787static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
788 unsigned write_speed, unsigned read_speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789{
790 struct packet_command cgc;
791 struct request_sense sense;
792 int ret;
793
794 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
795 cgc.sense = &sense;
796 cgc.cmd[0] = GPCMD_SET_SPEED;
797 cgc.cmd[2] = (read_speed >> 8) & 0xff;
798 cgc.cmd[3] = read_speed & 0xff;
799 cgc.cmd[4] = (write_speed >> 8) & 0xff;
800 cgc.cmd[5] = write_speed & 0xff;
801
802 if ((ret = pkt_generic_packet(pd, &cgc)))
Joe Perchesf3ded782013-09-11 14:25:58 -0700803 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 return ret;
806}
807
808/*
809 * Queue a bio for processing by the low-level CD device. Must be called
810 * from process context.
811 */
Peter Osterlund46c271b2005-06-23 00:10:02 -0700812static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
814 spin_lock(&pd->iosched.lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +0100815 if (bio_data_dir(bio) == READ)
816 bio_list_add(&pd->iosched.read_queue, bio);
817 else
818 bio_list_add(&pd->iosched.write_queue, bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 spin_unlock(&pd->iosched.lock);
820
821 atomic_set(&pd->iosched.attention, 1);
822 wake_up(&pd->wqueue);
823}
824
825/*
826 * Process the queued read/write requests. This function handles special
827 * requirements for CDRW drives:
828 * - A cache flush command must be inserted before a read request if the
829 * previous request was a write.
Peter Osterlund46c271b2005-06-23 00:10:02 -0700830 * - Switching between reading and writing is slow, so don't do it more often
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 * than necessary.
Peter Osterlund46c271b2005-06-23 00:10:02 -0700832 * - Optimize for throughput at the expense of latency. This means that streaming
833 * writes will never be interrupted by a read, but if the drive has to seek
834 * before the next write, switch to reading instead if there are any pending
835 * read requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 * - Set the read speed according to current usage pattern. When only reading
837 * from the device, it's best to use the highest possible read speed, but
838 * when switching often between reading and writing, it's better to have the
839 * same read and write speeds.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 */
841static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
842{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 if (atomic_read(&pd->iosched.attention) == 0)
845 return;
846 atomic_set(&pd->iosched.attention, 0);
847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 for (;;) {
849 struct bio *bio;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700850 int reads_queued, writes_queued;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
852 spin_lock(&pd->iosched.lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +0100853 reads_queued = !bio_list_empty(&pd->iosched.read_queue);
854 writes_queued = !bio_list_empty(&pd->iosched.write_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 spin_unlock(&pd->iosched.lock);
856
857 if (!reads_queued && !writes_queued)
858 break;
859
860 if (pd->iosched.writing) {
Peter Osterlund46c271b2005-06-23 00:10:02 -0700861 int need_write_seek = 1;
862 spin_lock(&pd->iosched.lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +0100863 bio = bio_list_peek(&pd->iosched.write_queue);
Peter Osterlund46c271b2005-06-23 00:10:02 -0700864 spin_unlock(&pd->iosched.lock);
Kent Overstreet4f024f32013-10-11 15:44:27 -0700865 if (bio && (bio->bi_iter.bi_sector ==
866 pd->iosched.last_write))
Peter Osterlund46c271b2005-06-23 00:10:02 -0700867 need_write_seek = 0;
868 if (need_write_seek && reads_queued) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
Joe Perches844aa792013-09-11 14:25:54 -0700870 pkt_dbg(2, pd, "write, waiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 break;
872 }
873 pkt_flush_cache(pd);
874 pd->iosched.writing = 0;
875 }
876 } else {
877 if (!reads_queued && writes_queued) {
878 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
Joe Perches844aa792013-09-11 14:25:54 -0700879 pkt_dbg(2, pd, "read, waiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 break;
881 }
882 pd->iosched.writing = 1;
883 }
884 }
885
886 spin_lock(&pd->iosched.lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +0100887 if (pd->iosched.writing)
888 bio = bio_list_pop(&pd->iosched.write_queue);
889 else
890 bio = bio_list_pop(&pd->iosched.read_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 spin_unlock(&pd->iosched.lock);
892
893 if (!bio)
894 continue;
895
896 if (bio_data_dir(bio) == READ)
Kent Overstreet4f024f32013-10-11 15:44:27 -0700897 pd->iosched.successive_reads +=
898 bio->bi_iter.bi_size >> 10;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700899 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 pd->iosched.successive_reads = 0;
Kent Overstreetf73a1c72012-09-25 15:05:12 -0700901 pd->iosched.last_write = bio_end_sector(bio);
Peter Osterlund46c271b2005-06-23 00:10:02 -0700902 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
904 if (pd->read_speed == pd->write_speed) {
905 pd->read_speed = MAX_SPEED;
906 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
907 }
908 } else {
909 if (pd->read_speed != pd->write_speed) {
910 pd->read_speed = pd->write_speed;
911 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
912 }
913 }
914
915 atomic_inc(&pd->cdrw.pending_bios);
916 generic_make_request(bio);
917 }
918}
919
920/*
921 * Special care is needed if the underlying block device has a small
922 * max_phys_segments value.
923 */
Jens Axboe165125e2007-07-24 09:28:11 +0200924static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925{
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400926 if ((pd->settings.size << 9) / CD_FRAMESIZE
Martin K. Petersen8a783622010-02-26 00:20:39 -0500927 <= queue_max_segments(q)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 /*
929 * The cdrom device can handle one segment/frame
930 */
931 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
932 return 0;
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400933 } else if ((pd->settings.size << 9) / PAGE_SIZE
Martin K. Petersen8a783622010-02-26 00:20:39 -0500934 <= queue_max_segments(q)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 /*
936 * We can handle this case at the expense of some extra memory
937 * copies during write operations
938 */
939 set_bit(PACKET_MERGE_SEGS, &pd->flags);
940 return 0;
941 } else {
Joe Perchesfa63c0a2013-09-11 14:25:55 -0700942 pkt_err(pd, "cdrom max_phys_segments too small\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 return -EIO;
944 }
945}
946
947/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 * Copy all data for this packet to pkt->pages[], so that
949 * a) The number of required segments for the write bio is minimized, which
950 * is necessary for some scsi controllers.
951 * b) The data can be used as cache to avoid read requests if we receive a
952 * new write request for the same zone.
953 */
Peter Osterlund72772322006-02-14 13:52:56 -0800954static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
956 int f, p, offs;
957
958 /* Copy all data to pkt->pages[] */
959 p = 0;
960 offs = 0;
961 for (f = 0; f < pkt->frames; f++) {
Peter Osterlund72772322006-02-14 13:52:56 -0800962 if (bvec[f].bv_page != pkt->pages[p]) {
Cong Wangcfd80052011-11-25 23:14:18 +0800963 void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 void *vto = page_address(pkt->pages[p]) + offs;
965 memcpy(vto, vfrom, CD_FRAMESIZE);
Cong Wangcfd80052011-11-25 23:14:18 +0800966 kunmap_atomic(vfrom);
Peter Osterlund72772322006-02-14 13:52:56 -0800967 bvec[f].bv_page = pkt->pages[p];
968 bvec[f].bv_offset = offs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 } else {
Peter Osterlund72772322006-02-14 13:52:56 -0800970 BUG_ON(bvec[f].bv_offset != offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 }
972 offs += CD_FRAMESIZE;
973 if (offs >= PAGE_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 offs = 0;
975 p++;
976 }
977 }
978}
979
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200980static void pkt_end_io_read(struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981{
982 struct packet_data *pkt = bio->bi_private;
983 struct pktcdvd_device *pd = pkt->pd;
984 BUG_ON(!pd);
985
Joe Perches844aa792013-09-11 14:25:54 -0700986 pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
Joe Perchescd3f2cd2013-09-11 14:25:53 -0700987 bio, (unsigned long long)pkt->sector,
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200988 (unsigned long long)bio->bi_iter.bi_sector, bio->bi_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200990 if (bio->bi_error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 atomic_inc(&pkt->io_errors);
992 if (atomic_dec_and_test(&pkt->io_wait)) {
993 atomic_inc(&pkt->run_sm);
994 wake_up(&pd->wqueue);
995 }
996 pkt_bio_finished(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997}
998
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200999static void pkt_end_io_packet_write(struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000{
1001 struct packet_data *pkt = bio->bi_private;
1002 struct pktcdvd_device *pd = pkt->pd;
1003 BUG_ON(!pd);
1004
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001005 pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 pd->stats.pkt_ended++;
1008
1009 pkt_bio_finished(pd);
1010 atomic_dec(&pkt->io_wait);
1011 atomic_inc(&pkt->run_sm);
1012 wake_up(&pd->wqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
1015/*
1016 * Schedule reads for the holes in a packet
1017 */
1018static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1019{
1020 int frames_read = 0;
1021 struct bio *bio;
1022 int f;
1023 char written[PACKET_MAX_SIZE];
1024
Akinobu Mitac5ecc482010-02-24 08:30:08 +01001025 BUG_ON(bio_list_empty(&pkt->orig_bios));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 atomic_set(&pkt->io_wait, 0);
1028 atomic_set(&pkt->io_errors, 0);
1029
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 /*
1031 * Figure out which frames we need to read before we can write.
1032 */
1033 memset(written, 0, sizeof(written));
1034 spin_lock(&pkt->lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +01001035 bio_list_for_each(bio, &pkt->orig_bios) {
Kent Overstreet4f024f32013-10-11 15:44:27 -07001036 int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
1037 (CD_FRAMESIZE >> 9);
1038 int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
Peter Osterlund06e7ab52005-09-13 01:25:28 -07001039 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 BUG_ON(first_frame < 0);
1041 BUG_ON(first_frame + num_frames > pkt->frames);
1042 for (f = first_frame; f < first_frame + num_frames; f++)
1043 written[f] = 1;
1044 }
1045 spin_unlock(&pkt->lock);
1046
Peter Osterlund06e7ab52005-09-13 01:25:28 -07001047 if (pkt->cache_valid) {
Joe Perches844aa792013-09-11 14:25:54 -07001048 pkt_dbg(2, pd, "zone %llx cached\n",
Peter Osterlund06e7ab52005-09-13 01:25:28 -07001049 (unsigned long long)pkt->sector);
1050 goto out_account;
1051 }
1052
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 /*
1054 * Schedule reads for missing parts of the packet.
1055 */
1056 for (f = 0; f < pkt->frames; f++) {
1057 int p, offset;
Kent Overstreetccc5c9c2012-09-07 13:44:02 -07001058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (written[f])
1060 continue;
Kent Overstreetccc5c9c2012-09-07 13:44:02 -07001061
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 bio = pkt->r_bios[f];
Kent Overstreetccc5c9c2012-09-07 13:44:02 -07001063 bio_reset(bio);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001064 bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 bio->bi_bdev = pd->bdev;
1066 bio->bi_end_io = pkt_end_io_read;
1067 bio->bi_private = pkt;
1068
1069 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1070 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
Joe Perches844aa792013-09-11 14:25:54 -07001071 pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 f, pkt->pages[p], offset);
1073 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1074 BUG();
1075
1076 atomic_inc(&pkt->io_wait);
1077 bio->bi_rw = READ;
Peter Osterlund46c271b2005-06-23 00:10:02 -07001078 pkt_queue_bio(pd, bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 frames_read++;
1080 }
1081
1082out_account:
Joe Perches844aa792013-09-11 14:25:54 -07001083 pkt_dbg(2, pd, "need %d frames for zone %llx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 frames_read, (unsigned long long)pkt->sector);
1085 pd->stats.pkt_started++;
1086 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087}
1088
1089/*
1090 * Find a packet matching zone, or the least recently used packet if
1091 * there is no match.
1092 */
1093static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1094{
1095 struct packet_data *pkt;
1096
1097 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1098 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1099 list_del_init(&pkt->list);
1100 if (pkt->sector != zone)
1101 pkt->cache_valid = 0;
Peter Osterlund610827d2005-09-13 01:25:29 -07001102 return pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 }
1104 }
Peter Osterlund610827d2005-09-13 01:25:29 -07001105 BUG();
1106 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107}
1108
1109static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1110{
1111 if (pkt->cache_valid) {
1112 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1113 } else {
1114 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1115 }
1116}
1117
1118/*
1119 * recover a failed write, query for relocation if possible
1120 *
1121 * returns 1 if recovery is possible, or 0 if not
1122 *
1123 */
1124static int pkt_start_recovery(struct packet_data *pkt)
1125{
1126 /*
1127 * FIXME. We need help from the file system to implement
1128 * recovery handling.
1129 */
1130 return 0;
1131#if 0
1132 struct request *rq = pkt->rq;
1133 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1134 struct block_device *pkt_bdev;
1135 struct super_block *sb = NULL;
1136 unsigned long old_block, new_block;
1137 sector_t new_sector;
1138
1139 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1140 if (pkt_bdev) {
1141 sb = get_super(pkt_bdev);
1142 bdput(pkt_bdev);
1143 }
1144
1145 if (!sb)
1146 return 0;
1147
Al Viroe7f59092011-07-07 15:45:59 -04001148 if (!sb->s_op->relocate_blocks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 goto out;
1150
1151 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1152 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1153 goto out;
1154
1155 new_sector = new_block * (CD_FRAMESIZE >> 9);
1156 pkt->sector = new_sector;
1157
Kent Overstreetff8e0072012-09-05 14:11:38 -07001158 bio_reset(pkt->bio);
1159 pkt->bio->bi_bdev = pd->bdev;
1160 pkt->bio->bi_rw = REQ_WRITE;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001161 pkt->bio->bi_iter.bi_sector = new_sector;
1162 pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;
Kent Overstreetff8e0072012-09-05 14:11:38 -07001163 pkt->bio->bi_vcnt = pkt->frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
Kent Overstreetff8e0072012-09-05 14:11:38 -07001165 pkt->bio->bi_end_io = pkt_end_io_packet_write;
1166 pkt->bio->bi_private = pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 drop_super(sb);
1169 return 1;
1170
1171out:
1172 drop_super(sb);
1173 return 0;
1174#endif
1175}
1176
1177static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1178{
1179#if PACKET_DEBUG > 1
1180 static const char *state_name[] = {
1181 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1182 };
1183 enum packet_data_state old_state = pkt->state;
Joe Perches844aa792013-09-11 14:25:54 -07001184 pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
Joe Perchescd3f2cd2013-09-11 14:25:53 -07001185 pkt->id, (unsigned long long)pkt->sector,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 state_name[old_state], state_name[state]);
1187#endif
1188 pkt->state = state;
1189}
1190
1191/*
1192 * Scan the work queue to see if we can start a new packet.
1193 * returns non-zero if any work was done.
1194 */
1195static int pkt_handle_queue(struct pktcdvd_device *pd)
1196{
1197 struct packet_data *pkt, *p;
1198 struct bio *bio = NULL;
1199 sector_t zone = 0; /* Suppress gcc warning */
1200 struct pkt_rb_node *node, *first_node;
1201 struct rb_node *n;
Thomas Maier0a0fc962006-12-08 02:36:11 -08001202 int wakeup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 atomic_set(&pd->scan_queue, 0);
1205
1206 if (list_empty(&pd->cdrw.pkt_free_list)) {
Joe Perches844aa792013-09-11 14:25:54 -07001207 pkt_dbg(2, pd, "no pkt\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 return 0;
1209 }
1210
1211 /*
1212 * Try to find a zone we are not already working on.
1213 */
1214 spin_lock(&pd->lock);
1215 first_node = pkt_rbtree_find(pd, pd->current_sector);
1216 if (!first_node) {
1217 n = rb_first(&pd->bio_queue);
1218 if (n)
1219 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1220 }
1221 node = first_node;
1222 while (node) {
1223 bio = node->bio;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001224 zone = get_zone(bio->bi_iter.bi_sector, pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
Peter Osterlund7baeb6a2005-05-16 21:53:42 -07001226 if (p->sector == zone) {
1227 bio = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 goto try_next_bio;
Peter Osterlund7baeb6a2005-05-16 21:53:42 -07001229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 }
1231 break;
1232try_next_bio:
1233 node = pkt_rbtree_next(node);
1234 if (!node) {
1235 n = rb_first(&pd->bio_queue);
1236 if (n)
1237 node = rb_entry(n, struct pkt_rb_node, rb_node);
1238 }
1239 if (node == first_node)
1240 node = NULL;
1241 }
1242 spin_unlock(&pd->lock);
1243 if (!bio) {
Joe Perches844aa792013-09-11 14:25:54 -07001244 pkt_dbg(2, pd, "no bio\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 return 0;
1246 }
1247
1248 pkt = pkt_get_packet_data(pd, zone);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
1250 pd->current_sector = zone + pd->settings.size;
1251 pkt->sector = zone;
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08001252 BUG_ON(pkt->frames != pd->settings.size >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 pkt->write_size = 0;
1254
1255 /*
1256 * Scan work queue for bios in the same zone and link them
1257 * to this packet.
1258 */
1259 spin_lock(&pd->lock);
Joe Perches844aa792013-09-11 14:25:54 -07001260 pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1262 bio = node->bio;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001263 pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
1264 get_zone(bio->bi_iter.bi_sector, pd));
1265 if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 break;
1267 pkt_rbtree_erase(pd, node);
1268 spin_lock(&pkt->lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +01001269 bio_list_add(&pkt->orig_bios, bio);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001270 pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 spin_unlock(&pkt->lock);
1272 }
Thomas Maier0a0fc962006-12-08 02:36:11 -08001273 /* check write congestion marks, and if bio_queue_size is
1274 below, wake up any waiters */
1275 wakeup = (pd->write_congestion_on > 0
1276 && pd->bio_queue_size <= pd->write_congestion_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 spin_unlock(&pd->lock);
Jens Axboe8aa7e842009-07-09 14:52:32 +02001278 if (wakeup) {
1279 clear_bdi_congested(&pd->disk->queue->backing_dev_info,
1280 BLK_RW_ASYNC);
1281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
1283 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1284 pkt_set_state(pkt, PACKET_WAITING_STATE);
1285 atomic_set(&pkt->run_sm, 1);
1286
1287 spin_lock(&pd->cdrw.active_list_lock);
1288 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1289 spin_unlock(&pd->cdrw.active_list_lock);
1290
1291 return 1;
1292}
1293
1294/*
1295 * Assemble a bio to write one packet and queue the bio for processing
1296 * by the underlying block device.
1297 */
1298static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1299{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 int f;
Peter Osterlund72772322006-02-14 13:52:56 -08001301 struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302
Kent Overstreetffb25dc2012-09-04 06:44:57 -07001303 bio_reset(pkt->w_bio);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001304 pkt->w_bio->bi_iter.bi_sector = pkt->sector;
Kent Overstreetffb25dc2012-09-04 06:44:57 -07001305 pkt->w_bio->bi_bdev = pd->bdev;
1306 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1307 pkt->w_bio->bi_private = pkt;
1308
1309 /* XXX: locking? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 for (f = 0; f < pkt->frames; f++) {
Peter Osterlund72772322006-02-14 13:52:56 -08001311 bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1312 bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
Kent Overstreetffb25dc2012-09-04 06:44:57 -07001313 if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
1314 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 }
Joe Perches844aa792013-09-11 14:25:54 -07001316 pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
1318 /*
Peter Osterlund72772322006-02-14 13:52:56 -08001319 * Fill-in bvec with data from orig_bios.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 spin_lock(&pkt->lock);
Kent Overstreetffb25dc2012-09-04 06:44:57 -07001322 bio_copy_data(pkt->w_bio, pkt->orig_bios.head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1325 spin_unlock(&pkt->lock);
1326
Joe Perches844aa792013-09-11 14:25:54 -07001327 pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
Kent Overstreetffb25dc2012-09-04 06:44:57 -07001328 pkt->write_size, (unsigned long long)pkt->sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
1330 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
Peter Osterlund72772322006-02-14 13:52:56 -08001331 pkt_make_local_copy(pkt, bvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 pkt->cache_valid = 1;
1333 } else {
1334 pkt->cache_valid = 0;
1335 }
1336
1337 /* Start the write request */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 atomic_set(&pkt->io_wait, 1);
1339 pkt->w_bio->bi_rw = WRITE;
Peter Osterlund46c271b2005-06-23 00:10:02 -07001340 pkt_queue_bio(pd, pkt->w_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341}
1342
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001343static void pkt_finish_packet(struct packet_data *pkt, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344{
Akinobu Mitac5ecc482010-02-24 08:30:08 +01001345 struct bio *bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001347 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 pkt->cache_valid = 0;
1349
1350 /* Finish all bios corresponding to this packet */
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001351 while ((bio = bio_list_pop(&pkt->orig_bios))) {
1352 bio->bi_error = error;
1353 bio_endio(bio);
1354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355}
1356
1357static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1358{
Joe Perches844aa792013-09-11 14:25:54 -07001359 pkt_dbg(2, pd, "pkt %d\n", pkt->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
1361 for (;;) {
1362 switch (pkt->state) {
1363 case PACKET_WAITING_STATE:
1364 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1365 return;
1366
1367 pkt->sleep_time = 0;
1368 pkt_gather_data(pd, pkt);
1369 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1370 break;
1371
1372 case PACKET_READ_WAIT_STATE:
1373 if (atomic_read(&pkt->io_wait) > 0)
1374 return;
1375
1376 if (atomic_read(&pkt->io_errors) > 0) {
1377 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1378 } else {
1379 pkt_start_write(pd, pkt);
1380 }
1381 break;
1382
1383 case PACKET_WRITE_WAIT_STATE:
1384 if (atomic_read(&pkt->io_wait) > 0)
1385 return;
1386
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001387 if (!pkt->w_bio->bi_error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1389 } else {
1390 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1391 }
1392 break;
1393
1394 case PACKET_RECOVERY_STATE:
1395 if (pkt_start_recovery(pkt)) {
1396 pkt_start_write(pd, pkt);
1397 } else {
Joe Perches844aa792013-09-11 14:25:54 -07001398 pkt_dbg(2, pd, "No recovery possible\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1400 }
1401 break;
1402
1403 case PACKET_FINISHED_STATE:
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001404 pkt_finish_packet(pkt, pkt->w_bio->bi_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 return;
1406
1407 default:
1408 BUG();
1409 break;
1410 }
1411 }
1412}
1413
1414static void pkt_handle_packets(struct pktcdvd_device *pd)
1415{
1416 struct packet_data *pkt, *next;
1417
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 /*
1419 * Run state machine for active packets
1420 */
1421 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1422 if (atomic_read(&pkt->run_sm) > 0) {
1423 atomic_set(&pkt->run_sm, 0);
1424 pkt_run_state_machine(pd, pkt);
1425 }
1426 }
1427
1428 /*
1429 * Move no longer active packets to the free list
1430 */
1431 spin_lock(&pd->cdrw.active_list_lock);
1432 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1433 if (pkt->state == PACKET_FINISHED_STATE) {
1434 list_del(&pkt->list);
1435 pkt_put_packet_data(pd, pkt);
1436 pkt_set_state(pkt, PACKET_IDLE_STATE);
1437 atomic_set(&pd->scan_queue, 1);
1438 }
1439 }
1440 spin_unlock(&pd->cdrw.active_list_lock);
1441}
1442
1443static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1444{
1445 struct packet_data *pkt;
1446 int i;
1447
Peter Osterlundae7642b2005-11-13 16:06:36 -08001448 for (i = 0; i < PACKET_NUM_STATES; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 states[i] = 0;
1450
1451 spin_lock(&pd->cdrw.active_list_lock);
1452 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1453 states[pkt->state]++;
1454 }
1455 spin_unlock(&pd->cdrw.active_list_lock);
1456}
1457
1458/*
1459 * kcdrwd is woken up when writes have been queued for one of our
1460 * registered devices
1461 */
1462static int kcdrwd(void *foobar)
1463{
1464 struct pktcdvd_device *pd = foobar;
1465 struct packet_data *pkt;
1466 long min_sleep_time, residue;
1467
Dongsheng Yang8698a742014-03-11 18:09:12 +08001468 set_user_nice(current, MIN_NICE);
Rafael J. Wysocki83144182007-07-17 04:03:35 -07001469 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471 for (;;) {
1472 DECLARE_WAITQUEUE(wait, current);
1473
1474 /*
1475 * Wait until there is something to do
1476 */
1477 add_wait_queue(&pd->wqueue, &wait);
1478 for (;;) {
1479 set_current_state(TASK_INTERRUPTIBLE);
1480
1481 /* Check if we need to run pkt_handle_queue */
1482 if (atomic_read(&pd->scan_queue) > 0)
1483 goto work_to_do;
1484
1485 /* Check if we need to run the state machine for some packet */
1486 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1487 if (atomic_read(&pkt->run_sm) > 0)
1488 goto work_to_do;
1489 }
1490
1491 /* Check if we need to process the iosched queues */
1492 if (atomic_read(&pd->iosched.attention) != 0)
1493 goto work_to_do;
1494
1495 /* Otherwise, go to sleep */
1496 if (PACKET_DEBUG > 1) {
1497 int states[PACKET_NUM_STATES];
1498 pkt_count_states(pd, states);
Joe Perches844aa792013-09-11 14:25:54 -07001499 pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
Joe Perchescd3f2cd2013-09-11 14:25:53 -07001500 states[0], states[1], states[2],
1501 states[3], states[4], states[5]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 }
1503
1504 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1505 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1506 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1507 min_sleep_time = pkt->sleep_time;
1508 }
1509
Joe Perches844aa792013-09-11 14:25:54 -07001510 pkt_dbg(2, pd, "sleeping\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 residue = schedule_timeout(min_sleep_time);
Joe Perches844aa792013-09-11 14:25:54 -07001512 pkt_dbg(2, pd, "wake up\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514 /* make swsusp happy with our thread */
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07001515 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
1517 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1518 if (!pkt->sleep_time)
1519 continue;
1520 pkt->sleep_time -= min_sleep_time - residue;
1521 if (pkt->sleep_time <= 0) {
1522 pkt->sleep_time = 0;
1523 atomic_inc(&pkt->run_sm);
1524 }
1525 }
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 if (kthread_should_stop())
1528 break;
1529 }
1530work_to_do:
1531 set_current_state(TASK_RUNNING);
1532 remove_wait_queue(&pd->wqueue, &wait);
1533
1534 if (kthread_should_stop())
1535 break;
1536
1537 /*
1538 * if pkt_handle_queue returns true, we can queue
1539 * another request.
1540 */
1541 while (pkt_handle_queue(pd))
1542 ;
1543
1544 /*
1545 * Handle packet state machine
1546 */
1547 pkt_handle_packets(pd);
1548
1549 /*
1550 * Handle iosched queues
1551 */
1552 pkt_iosched_process_queue(pd);
1553 }
1554
1555 return 0;
1556}
1557
1558static void pkt_print_settings(struct pktcdvd_device *pd)
1559{
Joe Perches0c075d62013-09-11 14:25:57 -07001560 pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
1561 pd->settings.fp ? "Fixed" : "Variable",
1562 pd->settings.size >> 2,
1563 pd->settings.block_mode == 8 ? '1' : '2');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564}
1565
1566static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1567{
1568 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1569
1570 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1571 cgc->cmd[2] = page_code | (page_control << 6);
1572 cgc->cmd[7] = cgc->buflen >> 8;
1573 cgc->cmd[8] = cgc->buflen & 0xff;
1574 cgc->data_direction = CGC_DATA_READ;
1575 return pkt_generic_packet(pd, cgc);
1576}
1577
1578static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1579{
1580 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1581 memset(cgc->buffer, 0, 2);
1582 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1583 cgc->cmd[1] = 0x10; /* PF */
1584 cgc->cmd[7] = cgc->buflen >> 8;
1585 cgc->cmd[8] = cgc->buflen & 0xff;
1586 cgc->data_direction = CGC_DATA_WRITE;
1587 return pkt_generic_packet(pd, cgc);
1588}
1589
1590static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1591{
1592 struct packet_command cgc;
1593 int ret;
1594
1595 /* set up command and get the disc info */
1596 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1597 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1598 cgc.cmd[8] = cgc.buflen = 2;
1599 cgc.quiet = 1;
1600
1601 if ((ret = pkt_generic_packet(pd, &cgc)))
1602 return ret;
1603
1604 /* not all drives have the same disc_info length, so requeue
1605 * packet with the length the drive tells us it can supply
1606 */
1607 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1608 sizeof(di->disc_information_length);
1609
1610 if (cgc.buflen > sizeof(disc_information))
1611 cgc.buflen = sizeof(disc_information);
1612
1613 cgc.cmd[8] = cgc.buflen;
1614 return pkt_generic_packet(pd, &cgc);
1615}
1616
1617static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1618{
1619 struct packet_command cgc;
1620 int ret;
1621
1622 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1623 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1624 cgc.cmd[1] = type & 3;
1625 cgc.cmd[4] = (track & 0xff00) >> 8;
1626 cgc.cmd[5] = track & 0xff;
1627 cgc.cmd[8] = 8;
1628 cgc.quiet = 1;
1629
1630 if ((ret = pkt_generic_packet(pd, &cgc)))
1631 return ret;
1632
1633 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1634 sizeof(ti->track_information_length);
1635
1636 if (cgc.buflen > sizeof(track_information))
1637 cgc.buflen = sizeof(track_information);
1638
1639 cgc.cmd[8] = cgc.buflen;
1640 return pkt_generic_packet(pd, &cgc);
1641}
1642
Peter Osterlund05680d82008-03-04 14:28:41 -08001643static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1644 long *last_written)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645{
1646 disc_information di;
1647 track_information ti;
1648 __u32 last_track;
1649 int ret = -1;
1650
1651 if ((ret = pkt_get_disc_info(pd, &di)))
1652 return ret;
1653
1654 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1655 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1656 return ret;
1657
1658 /* if this track is blank, try the previous. */
1659 if (ti.blank) {
1660 last_track--;
1661 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1662 return ret;
1663 }
1664
1665 /* if last recorded field is valid, return it. */
1666 if (ti.lra_v) {
1667 *last_written = be32_to_cpu(ti.last_rec_address);
1668 } else {
1669 /* make it up instead */
1670 *last_written = be32_to_cpu(ti.track_start) +
1671 be32_to_cpu(ti.track_size);
1672 if (ti.free_blocks)
1673 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1674 }
1675 return 0;
1676}
1677
1678/*
1679 * write mode select package based on pd->settings
1680 */
Peter Osterlund05680d82008-03-04 14:28:41 -08001681static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682{
1683 struct packet_command cgc;
1684 struct request_sense sense;
1685 write_param_page *wp;
1686 char buffer[128];
1687 int ret, size;
1688
1689 /* doesn't apply to DVD+RW or DVD-RAM */
1690 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1691 return 0;
1692
1693 memset(buffer, 0, sizeof(buffer));
1694 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1695 cgc.sense = &sense;
1696 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
Joe Perchesf3ded782013-09-11 14:25:58 -07001697 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 return ret;
1699 }
1700
1701 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1702 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1703 if (size > sizeof(buffer))
1704 size = sizeof(buffer);
1705
1706 /*
1707 * now get it all
1708 */
1709 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1710 cgc.sense = &sense;
1711 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
Joe Perchesf3ded782013-09-11 14:25:58 -07001712 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 return ret;
1714 }
1715
1716 /*
1717 * write page is offset header + block descriptor length
1718 */
1719 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1720
1721 wp->fp = pd->settings.fp;
1722 wp->track_mode = pd->settings.track_mode;
1723 wp->write_type = pd->settings.write_type;
1724 wp->data_block_type = pd->settings.block_mode;
1725
1726 wp->multi_session = 0;
1727
1728#ifdef PACKET_USE_LS
1729 wp->link_size = 7;
1730 wp->ls_v = 1;
1731#endif
1732
1733 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1734 wp->session_format = 0;
1735 wp->subhdr2 = 0x20;
1736 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1737 wp->session_format = 0x20;
1738 wp->subhdr2 = 8;
1739#if 0
1740 wp->mcn[0] = 0x80;
1741 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1742#endif
1743 } else {
1744 /*
1745 * paranoia
1746 */
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001747 pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 return 1;
1749 }
1750 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1751
1752 cgc.buflen = cgc.cmd[8] = size;
1753 if ((ret = pkt_mode_select(pd, &cgc))) {
Joe Perchesf3ded782013-09-11 14:25:58 -07001754 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 return ret;
1756 }
1757
1758 pkt_print_settings(pd);
1759 return 0;
1760}
1761
1762/*
Peter Osterlund7c613d52006-02-20 18:28:02 -08001763 * 1 -- we can write to this track, 0 -- we can't
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 */
Peter Osterlundab863ec2006-02-20 18:28:04 -08001765static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766{
Peter Osterlundab863ec2006-02-20 18:28:04 -08001767 switch (pd->mmc3_profile) {
1768 case 0x1a: /* DVD+RW */
1769 case 0x12: /* DVD-RAM */
1770 /* The track is always writable on DVD+RW/DVD-RAM */
1771 return 1;
1772 default:
1773 break;
1774 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Peter Osterlundab863ec2006-02-20 18:28:04 -08001776 if (!ti->packet || !ti->fp)
1777 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778
1779 /*
1780 * "good" settings as per Mt Fuji.
1781 */
Peter Osterlundab863ec2006-02-20 18:28:04 -08001782 if (ti->rt == 0 && ti->blank == 0)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001783 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
Peter Osterlundab863ec2006-02-20 18:28:04 -08001785 if (ti->rt == 0 && ti->blank == 1)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001786 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787
Peter Osterlundab863ec2006-02-20 18:28:04 -08001788 if (ti->rt == 1 && ti->blank == 0)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001789 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001791 pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001792 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793}
1794
1795/*
Peter Osterlund7c613d52006-02-20 18:28:02 -08001796 * 1 -- we can write to this disc, 0 -- we can't
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 */
Peter Osterlund7c613d52006-02-20 18:28:02 -08001798static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799{
1800 switch (pd->mmc3_profile) {
1801 case 0x0a: /* CD-RW */
1802 case 0xffff: /* MMC3 not supported */
1803 break;
1804 case 0x1a: /* DVD+RW */
1805 case 0x13: /* DVD-RW */
1806 case 0x12: /* DVD-RAM */
Peter Osterlund7c613d52006-02-20 18:28:02 -08001807 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 default:
Joe Perches844aa792013-09-11 14:25:54 -07001809 pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
Joe Perchescd3f2cd2013-09-11 14:25:53 -07001810 pd->mmc3_profile);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001811 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 }
1813
1814 /*
1815 * for disc type 0xff we should probably reserve a new track.
1816 * but i'm not sure, should we leave this to user apps? probably.
1817 */
1818 if (di->disc_type == 0xff) {
Joe Perchesca73dab2013-09-11 14:25:56 -07001819 pkt_notice(pd, "unknown disc - no track?\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001820 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 }
1822
1823 if (di->disc_type != 0x20 && di->disc_type != 0) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001824 pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001825 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 }
1827
1828 if (di->erasable == 0) {
Joe Perchesca73dab2013-09-11 14:25:56 -07001829 pkt_notice(pd, "disc not erasable\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001830 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 }
1832
1833 if (di->border_status == PACKET_SESSION_RESERVED) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001834 pkt_err(pd, "can't write to last track (reserved)\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001835 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 }
1837
Peter Osterlund7c613d52006-02-20 18:28:02 -08001838 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839}
1840
Peter Osterlund05680d82008-03-04 14:28:41 -08001841static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842{
1843 struct packet_command cgc;
1844 unsigned char buf[12];
1845 disc_information di;
1846 track_information ti;
1847 int ret, track;
1848
1849 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1850 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1851 cgc.cmd[8] = 8;
1852 ret = pkt_generic_packet(pd, &cgc);
1853 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1854
1855 memset(&di, 0, sizeof(disc_information));
1856 memset(&ti, 0, sizeof(track_information));
1857
1858 if ((ret = pkt_get_disc_info(pd, &di))) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001859 pkt_err(pd, "failed get_disc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 return ret;
1861 }
1862
Peter Osterlund7c613d52006-02-20 18:28:02 -08001863 if (!pkt_writable_disc(pd, &di))
Peter Osterlund9db91542006-02-20 18:28:04 -08001864 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1867
1868 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1869 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001870 pkt_err(pd, "failed get_track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 return ret;
1872 }
1873
Peter Osterlundab863ec2006-02-20 18:28:04 -08001874 if (!pkt_writable_track(pd, &ti)) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001875 pkt_err(pd, "can't write to this track\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08001876 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 }
1878
1879 /*
1880 * we keep packet size in 512 byte units, makes it easier to
1881 * deal with request calculations.
1882 */
1883 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1884 if (pd->settings.size == 0) {
Joe Perchesca73dab2013-09-11 14:25:56 -07001885 pkt_notice(pd, "detected zero packet size!\n");
Phillip Susia460ad62006-02-04 23:27:44 -08001886 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 }
Peter Osterlundd0272e72005-09-13 01:25:27 -07001888 if (pd->settings.size > PACKET_MAX_SECTORS) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001889 pkt_err(pd, "packet size is too big\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08001890 return -EROFS;
Peter Osterlundd0272e72005-09-13 01:25:27 -07001891 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 pd->settings.fp = ti.fp;
1893 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1894
1895 if (ti.nwa_v) {
1896 pd->nwa = be32_to_cpu(ti.next_writable);
1897 set_bit(PACKET_NWA_VALID, &pd->flags);
1898 }
1899
1900 /*
1901 * in theory we could use lra on -RW media as well and just zero
1902 * blocks that haven't been written yet, but in practice that
1903 * is just a no-go. we'll use that for -R, naturally.
1904 */
1905 if (ti.lra_v) {
1906 pd->lra = be32_to_cpu(ti.last_rec_address);
1907 set_bit(PACKET_LRA_VALID, &pd->flags);
1908 } else {
1909 pd->lra = 0xffffffff;
1910 set_bit(PACKET_LRA_VALID, &pd->flags);
1911 }
1912
1913 /*
1914 * fine for now
1915 */
1916 pd->settings.link_loss = 7;
1917 pd->settings.write_type = 0; /* packet */
1918 pd->settings.track_mode = ti.track_mode;
1919
1920 /*
1921 * mode1 or mode2 disc
1922 */
1923 switch (ti.data_mode) {
1924 case PACKET_MODE1:
1925 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1926 break;
1927 case PACKET_MODE2:
1928 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1929 break;
1930 default:
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001931 pkt_err(pd, "unknown data mode\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08001932 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 }
1934 return 0;
1935}
1936
1937/*
1938 * enable/disable write caching on drive
1939 */
Peter Osterlund05680d82008-03-04 14:28:41 -08001940static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
1941 int set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942{
1943 struct packet_command cgc;
1944 struct request_sense sense;
1945 unsigned char buf[64];
1946 int ret;
1947
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1949 cgc.sense = &sense;
1950 cgc.buflen = pd->mode_offset + 12;
1951
1952 /*
1953 * caching mode page might not be there, so quiet this command
1954 */
1955 cgc.quiet = 1;
1956
1957 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1958 return ret;
1959
1960 buf[pd->mode_offset + 10] |= (!!set << 2);
1961
1962 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1963 ret = pkt_mode_select(pd, &cgc);
1964 if (ret) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07001965 pkt_err(pd, "write caching control failed\n");
Joe Perchesf3ded782013-09-11 14:25:58 -07001966 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 } else if (!ret && set)
Joe Perchesca73dab2013-09-11 14:25:56 -07001968 pkt_notice(pd, "enabled write caching\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 return ret;
1970}
1971
1972static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1973{
1974 struct packet_command cgc;
1975
1976 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1977 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1978 cgc.cmd[4] = lockflag ? 1 : 0;
1979 return pkt_generic_packet(pd, &cgc);
1980}
1981
1982/*
1983 * Returns drive maximum write speed
1984 */
Peter Osterlund05680d82008-03-04 14:28:41 -08001985static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
1986 unsigned *write_speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987{
1988 struct packet_command cgc;
1989 struct request_sense sense;
1990 unsigned char buf[256+18];
1991 unsigned char *cap_buf;
1992 int ret, offset;
1993
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1995 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1996 cgc.sense = &sense;
1997
1998 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1999 if (ret) {
2000 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
2001 sizeof(struct mode_page_header);
2002 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2003 if (ret) {
Joe Perchesf3ded782013-09-11 14:25:58 -07002004 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 return ret;
2006 }
2007 }
2008
2009 offset = 20; /* Obsoleted field, used by older drives */
2010 if (cap_buf[1] >= 28)
2011 offset = 28; /* Current write speed selected */
2012 if (cap_buf[1] >= 30) {
2013 /* If the drive reports at least one "Logical Unit Write
2014 * Speed Performance Descriptor Block", use the information
2015 * in the first block. (contains the highest speed)
2016 */
2017 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
2018 if (num_spdb > 0)
2019 offset = 34;
2020 }
2021
2022 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
2023 return 0;
2024}
2025
2026/* These tables from cdrecord - I don't have orange book */
2027/* standard speed CD-RW (1-4x) */
2028static char clv_to_speed[16] = {
2029 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2030 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2031};
2032/* high speed CD-RW (-10x) */
2033static char hs_clv_to_speed[16] = {
2034 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2035 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2036};
2037/* ultra high speed CD-RW */
2038static char us_clv_to_speed[16] = {
2039 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2040 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2041};
2042
2043/*
2044 * reads the maximum media speed from ATIP
2045 */
Peter Osterlund05680d82008-03-04 14:28:41 -08002046static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2047 unsigned *speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048{
2049 struct packet_command cgc;
2050 struct request_sense sense;
2051 unsigned char buf[64];
2052 unsigned int size, st, sp;
2053 int ret;
2054
2055 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2056 cgc.sense = &sense;
2057 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2058 cgc.cmd[1] = 2;
2059 cgc.cmd[2] = 4; /* READ ATIP */
2060 cgc.cmd[8] = 2;
2061 ret = pkt_generic_packet(pd, &cgc);
2062 if (ret) {
Joe Perchesf3ded782013-09-11 14:25:58 -07002063 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 return ret;
2065 }
2066 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2067 if (size > sizeof(buf))
2068 size = sizeof(buf);
2069
2070 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2071 cgc.sense = &sense;
2072 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2073 cgc.cmd[1] = 2;
2074 cgc.cmd[2] = 4;
2075 cgc.cmd[8] = size;
2076 ret = pkt_generic_packet(pd, &cgc);
2077 if (ret) {
Joe Perchesf3ded782013-09-11 14:25:58 -07002078 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 return ret;
2080 }
2081
Alexey Dobriyaneaa0ff12008-02-06 01:36:06 -08002082 if (!(buf[6] & 0x40)) {
Joe Perchesca73dab2013-09-11 14:25:56 -07002083 pkt_notice(pd, "disc type is not CD-RW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 return 1;
2085 }
Alexey Dobriyaneaa0ff12008-02-06 01:36:06 -08002086 if (!(buf[6] & 0x4)) {
Joe Perchesca73dab2013-09-11 14:25:56 -07002087 pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 return 1;
2089 }
2090
2091 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2092
2093 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2094
2095 /* Info from cdrecord */
2096 switch (st) {
2097 case 0: /* standard speed */
2098 *speed = clv_to_speed[sp];
2099 break;
2100 case 1: /* high speed */
2101 *speed = hs_clv_to_speed[sp];
2102 break;
2103 case 2: /* ultra high speed */
2104 *speed = us_clv_to_speed[sp];
2105 break;
2106 default:
Joe Perchesca73dab2013-09-11 14:25:56 -07002107 pkt_notice(pd, "unknown disc sub-type %d\n", st);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 return 1;
2109 }
2110 if (*speed) {
Joe Perches0c075d62013-09-11 14:25:57 -07002111 pkt_info(pd, "maximum media speed: %d\n", *speed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 return 0;
2113 } else {
Joe Perchesca73dab2013-09-11 14:25:56 -07002114 pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 return 1;
2116 }
2117}
2118
Peter Osterlund05680d82008-03-04 14:28:41 -08002119static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120{
2121 struct packet_command cgc;
2122 struct request_sense sense;
2123 int ret;
2124
Joe Perches844aa792013-09-11 14:25:54 -07002125 pkt_dbg(2, pd, "Performing OPC\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126
2127 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2128 cgc.sense = &sense;
2129 cgc.timeout = 60*HZ;
2130 cgc.cmd[0] = GPCMD_SEND_OPC;
2131 cgc.cmd[1] = 1;
2132 if ((ret = pkt_generic_packet(pd, &cgc)))
Joe Perchesf3ded782013-09-11 14:25:58 -07002133 pkt_dump_sense(pd, &cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 return ret;
2135}
2136
2137static int pkt_open_write(struct pktcdvd_device *pd)
2138{
2139 int ret;
2140 unsigned int write_speed, media_write_speed, read_speed;
2141
2142 if ((ret = pkt_probe_settings(pd))) {
Joe Perches844aa792013-09-11 14:25:54 -07002143 pkt_dbg(2, pd, "failed probe\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08002144 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 }
2146
2147 if ((ret = pkt_set_write_settings(pd))) {
Joe Perches844aa792013-09-11 14:25:54 -07002148 pkt_dbg(1, pd, "failed saving write settings\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 return -EIO;
2150 }
2151
2152 pkt_write_caching(pd, USE_WCACHING);
2153
2154 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2155 write_speed = 16 * 177;
2156 switch (pd->mmc3_profile) {
2157 case 0x13: /* DVD-RW */
2158 case 0x1a: /* DVD+RW */
2159 case 0x12: /* DVD-RAM */
Joe Perches844aa792013-09-11 14:25:54 -07002160 pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 break;
2162 default:
2163 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2164 media_write_speed = 16;
2165 write_speed = min(write_speed, media_write_speed * 177);
Joe Perches844aa792013-09-11 14:25:54 -07002166 pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 break;
2168 }
2169 read_speed = write_speed;
2170
2171 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
Joe Perches844aa792013-09-11 14:25:54 -07002172 pkt_dbg(1, pd, "couldn't set write speed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 return -EIO;
2174 }
2175 pd->write_speed = write_speed;
2176 pd->read_speed = read_speed;
2177
2178 if ((ret = pkt_perform_opc(pd))) {
Joe Perches844aa792013-09-11 14:25:54 -07002179 pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 }
2181
2182 return 0;
2183}
2184
2185/*
2186 * called at open time.
2187 */
Al Viroaeb5d722008-09-02 15:28:45 -04002188static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189{
2190 int ret;
2191 long lba;
Jens Axboe165125e2007-07-24 09:28:11 +02002192 struct request_queue *q;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193
2194 /*
2195 * We need to re-open the cdrom device without O_NONBLOCK to be able
2196 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2197 * so bdget() can't fail.
2198 */
2199 bdget(pd->bdev->bd_dev);
Tejun Heoe525fd82010-11-13 11:55:17 +01002200 if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201 goto out;
2202
2203 if ((ret = pkt_get_last_written(pd, &lba))) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002204 pkt_err(pd, "pkt_get_last_written failed\n");
Tejun Heoe525fd82010-11-13 11:55:17 +01002205 goto out_putdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206 }
2207
2208 set_capacity(pd->disk, lba << 2);
2209 set_capacity(pd->bdev->bd_disk, lba << 2);
2210 bd_set_size(pd->bdev, (loff_t)lba << 11);
2211
2212 q = bdev_get_queue(pd->bdev);
2213 if (write) {
2214 if ((ret = pkt_open_write(pd)))
Tejun Heoe525fd82010-11-13 11:55:17 +01002215 goto out_putdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 /*
2217 * Some CDRW drives can not handle writes larger than one packet,
2218 * even if the size is a multiple of the packet size.
2219 */
2220 spin_lock_irq(q->queue_lock);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05002221 blk_queue_max_hw_sectors(q, pd->settings.size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222 spin_unlock_irq(q->queue_lock);
2223 set_bit(PACKET_WRITABLE, &pd->flags);
2224 } else {
2225 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2226 clear_bit(PACKET_WRITABLE, &pd->flags);
2227 }
2228
2229 if ((ret = pkt_set_segment_merging(pd, q)))
Tejun Heoe525fd82010-11-13 11:55:17 +01002230 goto out_putdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002232 if (write) {
2233 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002234 pkt_err(pd, "not enough memory for buffers\n");
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002235 ret = -ENOMEM;
Tejun Heoe525fd82010-11-13 11:55:17 +01002236 goto out_putdev;
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002237 }
Joe Perches0c075d62013-09-11 14:25:57 -07002238 pkt_info(pd, "%lukB available on disc\n", lba << 1);
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002239 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240
2241 return 0;
2242
2243out_putdev:
Tejun Heoe525fd82010-11-13 11:55:17 +01002244 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245out:
2246 return ret;
2247}
2248
2249/*
2250 * called when the device is closed. makes sure that the device flushes
2251 * the internal cache before we close.
2252 */
2253static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2254{
2255 if (flush && pkt_flush_cache(pd))
Joe Perches844aa792013-09-11 14:25:54 -07002256 pkt_dbg(1, pd, "not flushing cache\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257
2258 pkt_lock_door(pd, 0);
2259
2260 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
Tejun Heoe525fd82010-11-13 11:55:17 +01002261 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002262
2263 pkt_shrink_pktlist(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264}
2265
Dan Rosenberg252a52a2010-09-27 12:30:28 -04002266static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267{
2268 if (dev_minor >= MAX_WRITERS)
2269 return NULL;
2270 return pkt_devs[dev_minor];
2271}
2272
Al Viro5e5e0072008-03-02 10:15:10 -05002273static int pkt_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274{
2275 struct pktcdvd_device *pd = NULL;
2276 int ret;
2277
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002278 mutex_lock(&pktcdvd_mutex);
Jes Sorensen1657f822006-03-23 03:00:25 -08002279 mutex_lock(&ctl_mutex);
Al Viro5e5e0072008-03-02 10:15:10 -05002280 pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 if (!pd) {
2282 ret = -ENODEV;
2283 goto out;
2284 }
2285 BUG_ON(pd->refcnt < 0);
2286
2287 pd->refcnt++;
Peter Osterlund46f4e1b2005-05-20 13:59:06 -07002288 if (pd->refcnt > 1) {
Al Viro5e5e0072008-03-02 10:15:10 -05002289 if ((mode & FMODE_WRITE) &&
Peter Osterlund46f4e1b2005-05-20 13:59:06 -07002290 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2291 ret = -EBUSY;
2292 goto out_dec;
2293 }
2294 } else {
Al Viro5e5e0072008-03-02 10:15:10 -05002295 ret = pkt_open_dev(pd, mode & FMODE_WRITE);
Peter Osterlund01fd9fd2006-02-14 13:52:55 -08002296 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 goto out_dec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 /*
2299 * needed here as well, since ext2 (among others) may change
2300 * the blocksize at mount time
2301 */
Al Viro5e5e0072008-03-02 10:15:10 -05002302 set_blocksize(bdev, CD_FRAMESIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 }
2304
Jes Sorensen1657f822006-03-23 03:00:25 -08002305 mutex_unlock(&ctl_mutex);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002306 mutex_unlock(&pktcdvd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 return 0;
2308
2309out_dec:
2310 pd->refcnt--;
2311out:
Jes Sorensen1657f822006-03-23 03:00:25 -08002312 mutex_unlock(&ctl_mutex);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002313 mutex_unlock(&pktcdvd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 return ret;
2315}
2316
Al Virodb2a1442013-05-05 21:52:57 -04002317static void pkt_close(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318{
Al Viro5e5e0072008-03-02 10:15:10 -05002319 struct pktcdvd_device *pd = disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002321 mutex_lock(&pktcdvd_mutex);
Jes Sorensen1657f822006-03-23 03:00:25 -08002322 mutex_lock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 pd->refcnt--;
2324 BUG_ON(pd->refcnt < 0);
2325 if (pd->refcnt == 0) {
2326 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2327 pkt_release_dev(pd, flush);
2328 }
Jes Sorensen1657f822006-03-23 03:00:25 -08002329 mutex_unlock(&ctl_mutex);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002330 mutex_unlock(&pktcdvd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331}
2332
2333
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002334static void pkt_end_io_read_cloned(struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335{
2336 struct packet_stacked_data *psd = bio->bi_private;
2337 struct pktcdvd_device *pd = psd->pd;
2338
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002339 psd->bio->bi_error = bio->bi_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 bio_put(bio);
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002341 bio_endio(psd->bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 mempool_free(psd, psd_pool);
2343 pkt_bio_finished(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344}
2345
Kent Overstreet20d01892013-11-23 18:21:01 -08002346static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347{
Kent Overstreet20d01892013-11-23 18:21:01 -08002348 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2349 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2350
2351 psd->pd = pd;
2352 psd->bio = bio;
2353 cloned_bio->bi_bdev = pd->bdev;
2354 cloned_bio->bi_private = psd;
2355 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2356 pd->stats.secs_r += bio_sectors(bio);
2357 pkt_queue_bio(pd, cloned_bio);
2358}
2359
2360static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
2361{
2362 struct pktcdvd_device *pd = q->queuedata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 sector_t zone;
2364 struct packet_data *pkt;
2365 int was_empty, blocked_bio;
2366 struct pkt_rb_node *node;
2367
Kent Overstreet4f024f32013-10-11 15:44:27 -07002368 zone = get_zone(bio->bi_iter.bi_sector, pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369
2370 /*
2371 * If we find a matching packet in state WAITING or READ_WAIT, we can
2372 * just append this bio to that packet.
2373 */
2374 spin_lock(&pd->cdrw.active_list_lock);
2375 blocked_bio = 0;
2376 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2377 if (pkt->sector == zone) {
2378 spin_lock(&pkt->lock);
2379 if ((pkt->state == PACKET_WAITING_STATE) ||
2380 (pkt->state == PACKET_READ_WAIT_STATE)) {
Akinobu Mitac5ecc482010-02-24 08:30:08 +01002381 bio_list_add(&pkt->orig_bios, bio);
Kent Overstreet4f024f32013-10-11 15:44:27 -07002382 pkt->write_size +=
2383 bio->bi_iter.bi_size / CD_FRAMESIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 if ((pkt->write_size >= pkt->frames) &&
2385 (pkt->state == PACKET_WAITING_STATE)) {
2386 atomic_inc(&pkt->run_sm);
2387 wake_up(&pd->wqueue);
2388 }
2389 spin_unlock(&pkt->lock);
2390 spin_unlock(&pd->cdrw.active_list_lock);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +02002391 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 } else {
2393 blocked_bio = 1;
2394 }
2395 spin_unlock(&pkt->lock);
2396 }
2397 }
2398 spin_unlock(&pd->cdrw.active_list_lock);
2399
Thomas Maier0a0fc962006-12-08 02:36:11 -08002400 /*
2401 * Test if there is enough room left in the bio work queue
2402 * (queue size >= congestion on mark).
2403 * If not, wait till the work queue size is below the congestion off mark.
2404 */
2405 spin_lock(&pd->lock);
2406 if (pd->write_congestion_on > 0
2407 && pd->bio_queue_size >= pd->write_congestion_on) {
Jens Axboe8aa7e842009-07-09 14:52:32 +02002408 set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC);
Thomas Maier0a0fc962006-12-08 02:36:11 -08002409 do {
2410 spin_unlock(&pd->lock);
Jens Axboe8aa7e842009-07-09 14:52:32 +02002411 congestion_wait(BLK_RW_ASYNC, HZ);
Thomas Maier0a0fc962006-12-08 02:36:11 -08002412 spin_lock(&pd->lock);
2413 } while(pd->bio_queue_size > pd->write_congestion_off);
2414 }
2415 spin_unlock(&pd->lock);
2416
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 /*
2418 * No matching packet found. Store the bio in the work queue.
2419 */
2420 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421 node->bio = bio;
2422 spin_lock(&pd->lock);
2423 BUG_ON(pd->bio_queue_size < 0);
2424 was_empty = (pd->bio_queue_size == 0);
2425 pkt_rbtree_insert(pd, node);
2426 spin_unlock(&pd->lock);
2427
2428 /*
2429 * Wake up the worker thread.
2430 */
2431 atomic_set(&pd->scan_queue, 1);
2432 if (was_empty) {
2433 /* This wake_up is required for correct operation */
2434 wake_up(&pd->wqueue);
2435 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2436 /*
2437 * This wake up is not required for correct operation,
2438 * but improves performance in some cases.
2439 */
2440 wake_up(&pd->wqueue);
2441 }
Kent Overstreet20d01892013-11-23 18:21:01 -08002442}
2443
Jens Axboedece1632015-11-05 10:41:16 -07002444static blk_qc_t pkt_make_request(struct request_queue *q, struct bio *bio)
Kent Overstreet20d01892013-11-23 18:21:01 -08002445{
2446 struct pktcdvd_device *pd;
2447 char b[BDEVNAME_SIZE];
2448 struct bio *split;
2449
Kent Overstreet54efd502015-04-23 22:37:18 -07002450 blk_queue_bounce(q, &bio);
2451
2452 blk_queue_split(q, &bio, q->bio_split);
2453
Kent Overstreet20d01892013-11-23 18:21:01 -08002454 pd = q->queuedata;
2455 if (!pd) {
2456 pr_err("%s incorrect request queue\n",
2457 bdevname(bio->bi_bdev, b));
2458 goto end_io;
2459 }
2460
2461 pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
2462 (unsigned long long)bio->bi_iter.bi_sector,
2463 (unsigned long long)bio_end_sector(bio));
2464
2465 /*
2466 * Clone READ bios so we can have our own bi_end_io callback.
2467 */
2468 if (bio_data_dir(bio) == READ) {
2469 pkt_make_request_read(pd, bio);
Jens Axboedece1632015-11-05 10:41:16 -07002470 return BLK_QC_T_NONE;
Kent Overstreet20d01892013-11-23 18:21:01 -08002471 }
2472
2473 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2474 pkt_notice(pd, "WRITE for ro device (%llu)\n",
2475 (unsigned long long)bio->bi_iter.bi_sector);
2476 goto end_io;
2477 }
2478
2479 if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
2480 pkt_err(pd, "wrong bio size\n");
2481 goto end_io;
2482 }
2483
Kent Overstreet20d01892013-11-23 18:21:01 -08002484 do {
2485 sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
2486 sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
2487
2488 if (last_zone != zone) {
2489 BUG_ON(last_zone != zone + pd->settings.size);
2490
2491 split = bio_split(bio, last_zone -
2492 bio->bi_iter.bi_sector,
2493 GFP_NOIO, fs_bio_set);
2494 bio_chain(split, bio);
2495 } else {
2496 split = bio;
2497 }
2498
2499 pkt_make_request_write(q, split);
2500 } while (split != bio);
2501
Jens Axboedece1632015-11-05 10:41:16 -07002502 return BLK_QC_T_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503end_io:
NeilBrown6712ecf2007-09-27 12:47:43 +02002504 bio_io_error(bio);
Jens Axboedece1632015-11-05 10:41:16 -07002505 return BLK_QC_T_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506}
2507
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508static void pkt_init_queue(struct pktcdvd_device *pd)
2509{
Jens Axboe165125e2007-07-24 09:28:11 +02002510 struct request_queue *q = pd->disk->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511
2512 blk_queue_make_request(q, pkt_make_request);
Martin K. Petersene1defc42009-05-22 17:17:49 -04002513 blk_queue_logical_block_size(q, CD_FRAMESIZE);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05002514 blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 q->queuedata = pd;
2516}
2517
2518static int pkt_seq_show(struct seq_file *m, void *p)
2519{
2520 struct pktcdvd_device *pd = m->private;
2521 char *msg;
2522 char bdev_buf[BDEVNAME_SIZE];
2523 int states[PACKET_NUM_STATES];
2524
2525 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2526 bdevname(pd->bdev, bdev_buf));
2527
2528 seq_printf(m, "\nSettings:\n");
2529 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2530
2531 if (pd->settings.write_type == 0)
2532 msg = "Packet";
2533 else
2534 msg = "Unknown";
2535 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2536
2537 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2538 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2539
2540 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2541
2542 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2543 msg = "Mode 1";
2544 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2545 msg = "Mode 2";
2546 else
2547 msg = "Unknown";
2548 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2549
2550 seq_printf(m, "\nStatistics:\n");
2551 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2552 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2553 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2554 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2555 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2556
2557 seq_printf(m, "\nMisc:\n");
2558 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2559 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2560 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2561 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2562 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2563 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2564
2565 seq_printf(m, "\nQueue state:\n");
2566 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2567 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2568 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2569
2570 pkt_count_states(pd, states);
2571 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2572 states[0], states[1], states[2], states[3], states[4], states[5]);
2573
Thomas Maier0a0fc962006-12-08 02:36:11 -08002574 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2575 pd->write_congestion_off,
2576 pd->write_congestion_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 return 0;
2578}
2579
2580static int pkt_seq_open(struct inode *inode, struct file *file)
2581{
Al Virod9dda782013-03-31 18:16:14 -04002582 return single_open(file, pkt_seq_show, PDE_DATA(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583}
2584
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002585static const struct file_operations pkt_proc_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586 .open = pkt_seq_open,
2587 .read = seq_read,
2588 .llseek = seq_lseek,
2589 .release = single_release
2590};
2591
2592static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2593{
2594 int i;
2595 int ret = 0;
2596 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 struct block_device *bdev;
2598
2599 if (pd->pkt_dev == dev) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002600 pkt_err(pd, "recursive setup not allowed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 return -EBUSY;
2602 }
2603 for (i = 0; i < MAX_WRITERS; i++) {
2604 struct pktcdvd_device *pd2 = pkt_devs[i];
2605 if (!pd2)
2606 continue;
2607 if (pd2->bdev->bd_dev == dev) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002608 pkt_err(pd, "%s already setup\n",
2609 bdevname(pd2->bdev, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 return -EBUSY;
2611 }
2612 if (pd2->pkt_dev == dev) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002613 pkt_err(pd, "can't chain pktcdvd devices\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 return -EBUSY;
2615 }
2616 }
2617
2618 bdev = bdget(dev);
2619 if (!bdev)
2620 return -ENOMEM;
Tejun Heoe525fd82010-11-13 11:55:17 +01002621 ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 if (ret)
2623 return ret;
2624
2625 /* This is safe, since we have a reference from open(). */
2626 __module_get(THIS_MODULE);
2627
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628 pd->bdev = bdev;
2629 set_blocksize(bdev, CD_FRAMESIZE);
2630
2631 pkt_init_queue(pd);
2632
2633 atomic_set(&pd->cdrw.pending_bios, 0);
2634 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2635 if (IS_ERR(pd->cdrw.thread)) {
Joe Perchesfa63c0a2013-09-11 14:25:55 -07002636 pkt_err(pd, "can't start kernel thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 ret = -ENOMEM;
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002638 goto out_mem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 }
2640
Denis V. Lunevc7705f32008-04-29 01:02:35 -07002641 proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
Joe Perches844aa792013-09-11 14:25:54 -07002642 pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 return 0;
2644
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645out_mem:
Al Viro2cbed892008-11-30 01:33:57 -05002646 blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647 /* This is safe: open() is still holding a reference. */
2648 module_put(THIS_MODULE);
2649 return ret;
2650}
2651
Al Viro5e5e0072008-03-02 10:15:10 -05002652static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653{
Al Viro5e5e0072008-03-02 10:15:10 -05002654 struct pktcdvd_device *pd = bdev->bd_disk->private_data;
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02002655 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656
Joe Perches844aa792013-09-11 14:25:54 -07002657 pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
Joe Perchescd3f2cd2013-09-11 14:25:53 -07002658 cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002660 mutex_lock(&pktcdvd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 switch (cmd) {
Al Viroa0eb62a2007-08-29 00:56:32 -04002662 case CDROMEJECT:
2663 /*
2664 * The door gets locked when the device is opened, so we
2665 * have to unlock it or else the eject command fails.
2666 */
2667 if (pd->refcnt == 1)
2668 pkt_lock_door(pd, 0);
2669 /* fallthru */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 /*
2671 * forward selected CDROM ioctls to CD-ROM, for UDF
2672 */
2673 case CDROMMULTISESSION:
2674 case CDROMREADTOCENTRY:
2675 case CDROM_LAST_WRITTEN:
2676 case CDROM_SEND_PACKET:
2677 case SCSI_IOCTL_SEND_COMMAND:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02002678 ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
2679 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680
2681 default:
Joe Perches844aa792013-09-11 14:25:54 -07002682 pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02002683 ret = -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +02002685 mutex_unlock(&pktcdvd_mutex);
Linus Torvalds8560c652008-08-27 13:35:31 -07002686
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02002687 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688}
2689
Tejun Heo3c0d2062011-03-09 19:54:28 +01002690static unsigned int pkt_check_events(struct gendisk *disk,
2691 unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692{
2693 struct pktcdvd_device *pd = disk->private_data;
2694 struct gendisk *attached_disk;
2695
2696 if (!pd)
2697 return 0;
2698 if (!pd->bdev)
2699 return 0;
2700 attached_disk = pd->bdev->bd_disk;
Tejun Heo3c0d2062011-03-09 19:54:28 +01002701 if (!attached_disk || !attached_disk->fops->check_events)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702 return 0;
Tejun Heo3c0d2062011-03-09 19:54:28 +01002703 return attached_disk->fops->check_events(attached_disk, clearing);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704}
2705
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07002706static const struct block_device_operations pktcdvd_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002707 .owner = THIS_MODULE,
Al Viro5e5e0072008-03-02 10:15:10 -05002708 .open = pkt_open,
2709 .release = pkt_close,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02002710 .ioctl = pkt_ioctl,
Tejun Heo3c0d2062011-03-09 19:54:28 +01002711 .check_events = pkt_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712};
2713
Al Viro2c9ede52011-07-23 20:24:48 -04002714static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode)
Kay Sieversb03f38b2009-04-30 15:23:42 +02002715{
2716 return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name);
2717}
2718
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719/*
2720 * Set up mapping from pktcdvd device to CD-ROM device.
2721 */
Thomas Maieradb92502006-12-08 02:36:10 -08002722static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723{
2724 int idx;
2725 int ret = -ENOMEM;
2726 struct pktcdvd_device *pd;
2727 struct gendisk *disk;
Thomas Maieradb92502006-12-08 02:36:10 -08002728
2729 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730
2731 for (idx = 0; idx < MAX_WRITERS; idx++)
2732 if (!pkt_devs[idx])
2733 break;
2734 if (idx == MAX_WRITERS) {
Joe Perches99481332013-09-11 14:25:52 -07002735 pr_err("max %d writers supported\n", MAX_WRITERS);
Thomas Maieradb92502006-12-08 02:36:10 -08002736 ret = -EBUSY;
2737 goto out_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738 }
2739
Peter Osterlund1107d2e2005-09-13 01:25:29 -07002740 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 if (!pd)
Thomas Maieradb92502006-12-08 02:36:10 -08002742 goto out_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743
Matthew Dobson0eaae62a2006-03-26 01:37:47 -08002744 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2745 sizeof(struct pkt_rb_node));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002746 if (!pd->rb_pool)
2747 goto out_mem;
2748
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002749 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2750 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2751 spin_lock_init(&pd->cdrw.active_list_lock);
2752
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 spin_lock_init(&pd->lock);
2754 spin_lock_init(&pd->iosched.lock);
Akinobu Mitac5ecc482010-02-24 08:30:08 +01002755 bio_list_init(&pd->iosched.read_queue);
2756 bio_list_init(&pd->iosched.write_queue);
Thomas Maier78220822006-10-04 02:15:28 -07002757 sprintf(pd->name, DRIVER_NAME"%d", idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 init_waitqueue_head(&pd->wqueue);
2759 pd->bio_queue = RB_ROOT;
2760
Thomas Maier0a0fc962006-12-08 02:36:11 -08002761 pd->write_congestion_on = write_congestion_on;
2762 pd->write_congestion_off = write_congestion_off;
2763
Thomas Maieradb92502006-12-08 02:36:10 -08002764 disk = alloc_disk(1);
2765 if (!disk)
2766 goto out_mem;
2767 pd->disk = disk;
Thomas Maieradd21662006-10-04 02:15:30 -07002768 disk->major = pktdev_major;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002769 disk->first_minor = idx;
2770 disk->fops = &pktcdvd_ops;
2771 disk->flags = GENHD_FL_REMOVABLE;
Thomas Maieradb92502006-12-08 02:36:10 -08002772 strcpy(disk->disk_name, pd->name);
Kay Sieverse454cea2009-09-18 23:01:12 +02002773 disk->devnode = pktcdvd_devnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 disk->private_data = pd;
2775 disk->queue = blk_alloc_queue(GFP_KERNEL);
2776 if (!disk->queue)
2777 goto out_mem2;
2778
Tejun Heof331c022008-09-03 09:01:48 +02002779 pd->pkt_dev = MKDEV(pktdev_major, idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 ret = pkt_new_dev(pd, dev);
2781 if (ret)
2782 goto out_new_dev;
2783
Tejun Heo3c0d2062011-03-09 19:54:28 +01002784 /* inherit events of the host device */
2785 disk->events = pd->bdev->bd_disk->events;
2786 disk->async_events = pd->bdev->bd_disk->async_events;
2787
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788 add_disk(disk);
Thomas Maieradb92502006-12-08 02:36:10 -08002789
Thomas Maier32694852006-12-08 02:36:12 -08002790 pkt_sysfs_dev_new(pd);
2791 pkt_debugfs_dev_new(pd);
2792
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 pkt_devs[idx] = pd;
Thomas Maieradb92502006-12-08 02:36:10 -08002794 if (pkt_dev)
2795 *pkt_dev = pd->pkt_dev;
2796
2797 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002798 return 0;
2799
2800out_new_dev:
Al Viro1312f402006-03-12 11:02:03 -05002801 blk_cleanup_queue(disk->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802out_mem2:
2803 put_disk(disk);
2804out_mem:
Julia Lawall02205312015-09-13 14:15:01 +02002805 mempool_destroy(pd->rb_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 kfree(pd);
Thomas Maieradb92502006-12-08 02:36:10 -08002807out_mutex:
2808 mutex_unlock(&ctl_mutex);
Joe Perches99481332013-09-11 14:25:52 -07002809 pr_err("setup of pktcdvd device failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002810 return ret;
2811}
2812
2813/*
2814 * Tear down mapping from pktcdvd device to CD-ROM device.
2815 */
Thomas Maieradb92502006-12-08 02:36:10 -08002816static int pkt_remove_dev(dev_t pkt_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817{
2818 struct pktcdvd_device *pd;
2819 int idx;
Thomas Maieradb92502006-12-08 02:36:10 -08002820 int ret = 0;
2821
2822 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823
2824 for (idx = 0; idx < MAX_WRITERS; idx++) {
2825 pd = pkt_devs[idx];
2826 if (pd && (pd->pkt_dev == pkt_dev))
2827 break;
2828 }
2829 if (idx == MAX_WRITERS) {
Joe Perches666dc7c2013-09-11 14:25:59 -07002830 pr_debug("dev not setup\n");
Thomas Maieradb92502006-12-08 02:36:10 -08002831 ret = -ENXIO;
2832 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833 }
2834
Thomas Maieradb92502006-12-08 02:36:10 -08002835 if (pd->refcnt > 0) {
2836 ret = -EBUSY;
2837 goto out;
2838 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839 if (!IS_ERR(pd->cdrw.thread))
2840 kthread_stop(pd->cdrw.thread);
2841
Thomas Maier32694852006-12-08 02:36:12 -08002842 pkt_devs[idx] = NULL;
2843
2844 pkt_debugfs_dev_remove(pd);
2845 pkt_sysfs_dev_remove(pd);
2846
Al Viro2cbed892008-11-30 01:33:57 -05002847 blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849 remove_proc_entry(pd->name, pkt_proc);
Joe Perches844aa792013-09-11 14:25:54 -07002850 pkt_dbg(1, pd, "writer unmapped\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851
2852 del_gendisk(pd->disk);
Al Viro1312f402006-03-12 11:02:03 -05002853 blk_cleanup_queue(pd->disk->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854 put_disk(pd->disk);
2855
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 mempool_destroy(pd->rb_pool);
2857 kfree(pd);
2858
2859 /* This is safe: open() is still holding a reference. */
2860 module_put(THIS_MODULE);
Thomas Maieradb92502006-12-08 02:36:10 -08002861
2862out:
2863 mutex_unlock(&ctl_mutex);
2864 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865}
2866
2867static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2868{
Thomas Maieradb92502006-12-08 02:36:10 -08002869 struct pktcdvd_device *pd;
2870
2871 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2872
2873 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874 if (pd) {
2875 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2876 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2877 } else {
2878 ctrl_cmd->dev = 0;
2879 ctrl_cmd->pkt_dev = 0;
2880 }
2881 ctrl_cmd->num_devices = MAX_WRITERS;
Thomas Maieradb92502006-12-08 02:36:10 -08002882
2883 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884}
2885
Arnd Bergmannf80a0ca2010-04-28 14:36:41 +02002886static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887{
2888 void __user *argp = (void __user *)arg;
2889 struct pkt_ctrl_command ctrl_cmd;
2890 int ret = 0;
Thomas Maieradb92502006-12-08 02:36:10 -08002891 dev_t pkt_dev = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002892
2893 if (cmd != PACKET_CTRL_CMD)
2894 return -ENOTTY;
2895
2896 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2897 return -EFAULT;
2898
2899 switch (ctrl_cmd.command) {
2900 case PKT_CTRL_CMD_SETUP:
2901 if (!capable(CAP_SYS_ADMIN))
2902 return -EPERM;
Thomas Maieradb92502006-12-08 02:36:10 -08002903 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
2904 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 break;
2906 case PKT_CTRL_CMD_TEARDOWN:
2907 if (!capable(CAP_SYS_ADMIN))
2908 return -EPERM;
Thomas Maieradb92502006-12-08 02:36:10 -08002909 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910 break;
2911 case PKT_CTRL_CMD_STATUS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 pkt_get_status(&ctrl_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913 break;
2914 default:
2915 return -ENOTTY;
2916 }
2917
2918 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2919 return -EFAULT;
2920 return ret;
2921}
2922
Arnd Bergmannf80a0ca2010-04-28 14:36:41 +02002923#ifdef CONFIG_COMPAT
2924static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2925{
2926 return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2927}
2928#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002930static const struct file_operations pkt_ctl_fops = {
Arnd Bergmannf80a0ca2010-04-28 14:36:41 +02002931 .open = nonseekable_open,
2932 .unlocked_ioctl = pkt_ctl_ioctl,
2933#ifdef CONFIG_COMPAT
2934 .compat_ioctl = pkt_ctl_compat_ioctl,
2935#endif
2936 .owner = THIS_MODULE,
Arnd Bergmann6038f372010-08-15 18:52:59 +02002937 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002938};
2939
2940static struct miscdevice pkt_misc = {
2941 .minor = MISC_DYNAMIC_MINOR,
Thomas Maier78220822006-10-04 02:15:28 -07002942 .name = DRIVER_NAME,
Kay Sieverse454cea2009-09-18 23:01:12 +02002943 .nodename = "pktcdvd/control",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944 .fops = &pkt_ctl_fops
2945};
2946
2947static int __init pkt_init(void)
2948{
2949 int ret;
2950
Thomas Maier32694852006-12-08 02:36:12 -08002951 mutex_init(&ctl_mutex);
2952
Matthew Dobson0eaae62a2006-03-26 01:37:47 -08002953 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
2954 sizeof(struct packet_stacked_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955 if (!psd_pool)
2956 return -ENOMEM;
2957
Thomas Maieradd21662006-10-04 02:15:30 -07002958 ret = register_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 if (ret < 0) {
Joe Perches99481332013-09-11 14:25:52 -07002960 pr_err("unable to register block device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002961 goto out2;
2962 }
Thomas Maieradd21662006-10-04 02:15:30 -07002963 if (!pktdev_major)
2964 pktdev_major = ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965
Thomas Maier32694852006-12-08 02:36:12 -08002966 ret = pkt_sysfs_init();
2967 if (ret)
2968 goto out;
2969
2970 pkt_debugfs_init();
2971
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 ret = misc_register(&pkt_misc);
2973 if (ret) {
Joe Perches99481332013-09-11 14:25:52 -07002974 pr_err("unable to register misc device\n");
Thomas Maier32694852006-12-08 02:36:12 -08002975 goto out_misc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 }
2977
Alexey Dobriyan928b4d82008-04-29 01:01:44 -07002978 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980 return 0;
2981
Thomas Maier32694852006-12-08 02:36:12 -08002982out_misc:
2983 pkt_debugfs_cleanup();
2984 pkt_sysfs_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985out:
Thomas Maieradd21662006-10-04 02:15:30 -07002986 unregister_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002987out2:
2988 mempool_destroy(psd_pool);
2989 return ret;
2990}
2991
2992static void __exit pkt_exit(void)
2993{
Alexey Dobriyan928b4d82008-04-29 01:01:44 -07002994 remove_proc_entry("driver/"DRIVER_NAME, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995 misc_deregister(&pkt_misc);
Thomas Maier32694852006-12-08 02:36:12 -08002996
2997 pkt_debugfs_cleanup();
2998 pkt_sysfs_cleanup();
2999
Thomas Maieradd21662006-10-04 02:15:30 -07003000 unregister_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003001 mempool_destroy(psd_pool);
3002}
3003
3004MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3005MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3006MODULE_LICENSE("GPL");
3007
3008module_init(pkt_init);
3009module_exit(pkt_exit);