2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
9 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
12 * Theory of operation:
14 * At the lowest level, there is the standard driver for the CD/DVD device,
15 * such as drivers/scsi/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.
23 * The purpose of the packet writing driver is to hide these restrictions from
24 * higher layers, such as file systems, and present a block device that can be
25 * randomly read and written using 2kB-sized blocks.
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.
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.
39 * At the top layer there is a custom ->submit_bio 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.
45 *************************************************************************/
47 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
49 #include <linux/backing-dev.h>
50 #include <linux/compat.h>
51 #include <linux/debugfs.h>
52 #include <linux/device.h>
53 #include <linux/errno.h>
54 #include <linux/file.h>
55 #include <linux/freezer.h>
56 #include <linux/kernel.h>
57 #include <linux/kthread.h>
58 #include <linux/miscdevice.h>
59 #include <linux/module.h>
60 #include <linux/mutex.h>
61 #include <linux/nospec.h>
62 #include <linux/pktcdvd.h>
63 #include <linux/proc_fs.h>
64 #include <linux/seq_file.h>
65 #include <linux/slab.h>
66 #include <linux/spinlock.h>
67 #include <linux/types.h>
68 #include <linux/uaccess.h>
70 #include <scsi/scsi.h>
71 #include <scsi/scsi_cmnd.h>
72 #include <scsi/scsi_ioctl.h>
74 #include <asm/unaligned.h>
76 #define DRIVER_NAME "pktcdvd"
78 #define MAX_SPEED 0xffff
80 static DEFINE_MUTEX(pktcdvd_mutex);
81 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
82 static struct proc_dir_entry *pkt_proc;
83 static int pktdev_major;
84 static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
85 static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
86 static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
87 static mempool_t psd_pool;
88 static struct bio_set pkt_bio_set;
90 /* /sys/class/pktcdvd */
91 static struct class class_pktcdvd;
92 static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
94 /* forward declaration */
95 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
96 static int pkt_remove_dev(dev_t pkt_dev);
98 static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
100 return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
103 /**********************************************************
104 * sysfs interface for pktcdvd
105 * by (C) 2006 Thomas Maier <balagi@justmail.de>
107 /sys/class/pktcdvd/pktcdvd[0-7]/
110 stat/packets_finished
115 write_queue/congestion_off
116 write_queue/congestion_on
117 **********************************************************/
119 static ssize_t packets_started_show(struct device *dev,
120 struct device_attribute *attr, char *buf)
122 struct pktcdvd_device *pd = dev_get_drvdata(dev);
124 return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started);
126 static DEVICE_ATTR_RO(packets_started);
128 static ssize_t packets_finished_show(struct device *dev,
129 struct device_attribute *attr, char *buf)
131 struct pktcdvd_device *pd = dev_get_drvdata(dev);
133 return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended);
135 static DEVICE_ATTR_RO(packets_finished);
137 static ssize_t kb_written_show(struct device *dev,
138 struct device_attribute *attr, char *buf)
140 struct pktcdvd_device *pd = dev_get_drvdata(dev);
142 return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1);
144 static DEVICE_ATTR_RO(kb_written);
146 static ssize_t kb_read_show(struct device *dev,
147 struct device_attribute *attr, char *buf)
149 struct pktcdvd_device *pd = dev_get_drvdata(dev);
151 return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1);
153 static DEVICE_ATTR_RO(kb_read);
155 static ssize_t kb_read_gather_show(struct device *dev,
156 struct device_attribute *attr, char *buf)
158 struct pktcdvd_device *pd = dev_get_drvdata(dev);
160 return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1);
162 static DEVICE_ATTR_RO(kb_read_gather);
164 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
165 const char *buf, size_t len)
167 struct pktcdvd_device *pd = dev_get_drvdata(dev);
170 pd->stats.pkt_started = 0;
171 pd->stats.pkt_ended = 0;
172 pd->stats.secs_w = 0;
173 pd->stats.secs_rg = 0;
174 pd->stats.secs_r = 0;
178 static DEVICE_ATTR_WO(reset);
180 static struct attribute *pkt_stat_attrs[] = {
181 &dev_attr_packets_finished.attr,
182 &dev_attr_packets_started.attr,
183 &dev_attr_kb_read.attr,
184 &dev_attr_kb_written.attr,
185 &dev_attr_kb_read_gather.attr,
186 &dev_attr_reset.attr,
190 static const struct attribute_group pkt_stat_group = {
192 .attrs = pkt_stat_attrs,
195 static ssize_t size_show(struct device *dev,
196 struct device_attribute *attr, char *buf)
198 struct pktcdvd_device *pd = dev_get_drvdata(dev);
201 spin_lock(&pd->lock);
202 n = sysfs_emit(buf, "%d\n", pd->bio_queue_size);
203 spin_unlock(&pd->lock);
206 static DEVICE_ATTR_RO(size);
208 static void init_write_congestion_marks(int* lo, int* hi)
212 *hi = min(*hi, 1000000);
216 *lo = min(*lo, *hi - 100);
225 static ssize_t congestion_off_show(struct device *dev,
226 struct device_attribute *attr, char *buf)
228 struct pktcdvd_device *pd = dev_get_drvdata(dev);
231 spin_lock(&pd->lock);
232 n = sysfs_emit(buf, "%d\n", pd->write_congestion_off);
233 spin_unlock(&pd->lock);
237 static ssize_t congestion_off_store(struct device *dev,
238 struct device_attribute *attr,
239 const char *buf, size_t len)
241 struct pktcdvd_device *pd = dev_get_drvdata(dev);
244 ret = kstrtoint(buf, 10, &val);
248 spin_lock(&pd->lock);
249 pd->write_congestion_off = val;
250 init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
251 spin_unlock(&pd->lock);
254 static DEVICE_ATTR_RW(congestion_off);
256 static ssize_t congestion_on_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
259 struct pktcdvd_device *pd = dev_get_drvdata(dev);
262 spin_lock(&pd->lock);
263 n = sysfs_emit(buf, "%d\n", pd->write_congestion_on);
264 spin_unlock(&pd->lock);
268 static ssize_t congestion_on_store(struct device *dev,
269 struct device_attribute *attr,
270 const char *buf, size_t len)
272 struct pktcdvd_device *pd = dev_get_drvdata(dev);
275 ret = kstrtoint(buf, 10, &val);
279 spin_lock(&pd->lock);
280 pd->write_congestion_on = val;
281 init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
282 spin_unlock(&pd->lock);
285 static DEVICE_ATTR_RW(congestion_on);
287 static struct attribute *pkt_wq_attrs[] = {
288 &dev_attr_congestion_on.attr,
289 &dev_attr_congestion_off.attr,
294 static const struct attribute_group pkt_wq_group = {
295 .name = "write_queue",
296 .attrs = pkt_wq_attrs,
299 static const struct attribute_group *pkt_groups[] = {
305 static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
307 if (class_is_registered(&class_pktcdvd)) {
308 pd->dev = device_create_with_groups(&class_pktcdvd, NULL,
309 MKDEV(0, 0), pd, pkt_groups,
310 "%s", pd->disk->disk_name);
316 static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
318 if (class_is_registered(&class_pktcdvd))
319 device_unregister(pd->dev);
323 /********************************************************************
326 remove unmap packet dev
327 device_map show mappings
328 *******************************************************************/
330 static ssize_t device_map_show(const struct class *c, const struct class_attribute *attr,
335 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
336 for (idx = 0; idx < MAX_WRITERS; idx++) {
337 struct pktcdvd_device *pd = pkt_devs[idx];
340 n += sysfs_emit_at(data, n, "%s %u:%u %u:%u\n",
342 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
343 MAJOR(pd->bdev_handle->bdev->bd_dev),
344 MINOR(pd->bdev_handle->bdev->bd_dev));
346 mutex_unlock(&ctl_mutex);
349 static CLASS_ATTR_RO(device_map);
351 static ssize_t add_store(const struct class *c, const struct class_attribute *attr,
352 const char *buf, size_t count)
354 unsigned int major, minor;
356 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
357 /* pkt_setup_dev() expects caller to hold reference to self */
358 if (!try_module_get(THIS_MODULE))
361 pkt_setup_dev(MKDEV(major, minor), NULL);
363 module_put(THIS_MODULE);
370 static CLASS_ATTR_WO(add);
372 static ssize_t remove_store(const struct class *c, const struct class_attribute *attr,
373 const char *buf, size_t count)
375 unsigned int major, minor;
376 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
377 pkt_remove_dev(MKDEV(major, minor));
382 static CLASS_ATTR_WO(remove);
384 static struct attribute *class_pktcdvd_attrs[] = {
385 &class_attr_add.attr,
386 &class_attr_remove.attr,
387 &class_attr_device_map.attr,
390 ATTRIBUTE_GROUPS(class_pktcdvd);
392 static struct class class_pktcdvd = {
394 .class_groups = class_pktcdvd_groups,
397 static int pkt_sysfs_init(void)
400 * create control files in sysfs
401 * /sys/class/pktcdvd/...
403 return class_register(&class_pktcdvd);
406 static void pkt_sysfs_cleanup(void)
408 class_unregister(&class_pktcdvd);
411 /********************************************************************
414 /sys/kernel/debug/pktcdvd[0-7]/
417 *******************************************************************/
419 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
421 struct packet_data *pkt;
424 for (i = 0; i < PACKET_NUM_STATES; i++)
427 spin_lock(&pd->cdrw.active_list_lock);
428 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
429 states[pkt->state]++;
431 spin_unlock(&pd->cdrw.active_list_lock);
434 static int pkt_seq_show(struct seq_file *m, void *p)
436 struct pktcdvd_device *pd = m->private;
438 int states[PACKET_NUM_STATES];
440 seq_printf(m, "Writer %s mapped to %pg:\n", pd->disk->disk_name,
441 pd->bdev_handle->bdev);
443 seq_printf(m, "\nSettings:\n");
444 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
446 if (pd->settings.write_type == 0)
450 seq_printf(m, "\twrite type:\t\t%s\n", msg);
452 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
453 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
455 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
457 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
459 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
463 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
465 seq_printf(m, "\nStatistics:\n");
466 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
467 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
468 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
469 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
470 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
472 seq_printf(m, "\nMisc:\n");
473 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
474 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
475 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
476 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
477 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
478 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
480 seq_printf(m, "\nQueue state:\n");
481 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
482 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
483 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", pd->current_sector);
485 pkt_count_states(pd, states);
486 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
487 states[0], states[1], states[2], states[3], states[4], states[5]);
489 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
490 pd->write_congestion_off,
491 pd->write_congestion_on);
494 DEFINE_SHOW_ATTRIBUTE(pkt_seq);
496 static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
498 if (!pkt_debugfs_root)
500 pd->dfs_d_root = debugfs_create_dir(pd->disk->disk_name, pkt_debugfs_root);
504 pd->dfs_f_info = debugfs_create_file("info", 0444, pd->dfs_d_root,
508 static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
510 if (!pkt_debugfs_root)
512 debugfs_remove(pd->dfs_f_info);
513 debugfs_remove(pd->dfs_d_root);
514 pd->dfs_f_info = NULL;
515 pd->dfs_d_root = NULL;
518 static void pkt_debugfs_init(void)
520 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
523 static void pkt_debugfs_cleanup(void)
525 debugfs_remove(pkt_debugfs_root);
526 pkt_debugfs_root = NULL;
529 /* ----------------------------------------------------------*/
532 static void pkt_bio_finished(struct pktcdvd_device *pd)
534 struct device *ddev = disk_to_dev(pd->disk);
536 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
537 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
538 dev_dbg(ddev, "queue empty\n");
539 atomic_set(&pd->iosched.attention, 1);
540 wake_up(&pd->wqueue);
545 * Allocate a packet_data struct
547 static struct packet_data *pkt_alloc_packet_data(int frames)
550 struct packet_data *pkt;
552 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
556 pkt->frames = frames;
557 pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL);
561 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
562 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
567 spin_lock_init(&pkt->lock);
568 bio_list_init(&pkt->orig_bios);
570 for (i = 0; i < frames; i++) {
571 pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL);
579 for (i = 0; i < frames; i++)
580 kfree(pkt->r_bios[i]);
582 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
584 __free_page(pkt->pages[i]);
593 * Free a packet_data struct
595 static void pkt_free_packet_data(struct packet_data *pkt)
599 for (i = 0; i < pkt->frames; i++)
600 kfree(pkt->r_bios[i]);
601 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
602 __free_page(pkt->pages[i]);
607 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
609 struct packet_data *pkt, *next;
611 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
613 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
614 pkt_free_packet_data(pkt);
616 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
619 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
621 struct packet_data *pkt;
623 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
625 while (nr_packets > 0) {
626 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
628 pkt_shrink_pktlist(pd);
631 pkt->id = nr_packets;
633 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
639 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
641 struct rb_node *n = rb_next(&node->rb_node);
644 return rb_entry(n, struct pkt_rb_node, rb_node);
647 static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
649 rb_erase(&node->rb_node, &pd->bio_queue);
650 mempool_free(node, &pd->rb_pool);
651 pd->bio_queue_size--;
652 BUG_ON(pd->bio_queue_size < 0);
656 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
658 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
660 struct rb_node *n = pd->bio_queue.rb_node;
661 struct rb_node *next;
662 struct pkt_rb_node *tmp;
665 BUG_ON(pd->bio_queue_size > 0);
670 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
671 if (s <= tmp->bio->bi_iter.bi_sector)
680 if (s > tmp->bio->bi_iter.bi_sector) {
681 tmp = pkt_rbtree_next(tmp);
685 BUG_ON(s > tmp->bio->bi_iter.bi_sector);
690 * Insert a node into the pd->bio_queue rb tree.
692 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
694 struct rb_node **p = &pd->bio_queue.rb_node;
695 struct rb_node *parent = NULL;
696 sector_t s = node->bio->bi_iter.bi_sector;
697 struct pkt_rb_node *tmp;
701 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
702 if (s < tmp->bio->bi_iter.bi_sector)
707 rb_link_node(&node->rb_node, parent, p);
708 rb_insert_color(&node->rb_node, &pd->bio_queue);
709 pd->bio_queue_size++;
713 * Send a packet_command to the underlying block device and
714 * wait for completion.
716 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
718 struct request_queue *q = bdev_get_queue(pd->bdev_handle->bdev);
719 struct scsi_cmnd *scmd;
723 rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
724 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
727 scmd = blk_mq_rq_to_pdu(rq);
730 ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
736 scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
737 memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE);
741 rq->rq_flags |= RQF_QUIET;
743 blk_execute_rq(rq, false);
747 blk_mq_free_request(rq);
751 static const char *sense_key_string(__u8 index)
753 static const char * const info[] = {
754 "No sense", "Recovered error", "Not ready",
755 "Medium error", "Hardware error", "Illegal request",
756 "Unit attention", "Data protect", "Blank check",
759 return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
763 * A generic sense dump / resolve mechanism should be implemented across
764 * all ATAPI + SCSI devices.
766 static void pkt_dump_sense(struct pktcdvd_device *pd,
767 struct packet_command *cgc)
769 struct device *ddev = disk_to_dev(pd->disk);
770 struct scsi_sense_hdr *sshdr = cgc->sshdr;
773 dev_err(ddev, "%*ph - sense %02x.%02x.%02x (%s)\n",
774 CDROM_PACKET_SIZE, cgc->cmd,
775 sshdr->sense_key, sshdr->asc, sshdr->ascq,
776 sense_key_string(sshdr->sense_key));
778 dev_err(ddev, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
782 * flush the drive cache to media
784 static int pkt_flush_cache(struct pktcdvd_device *pd)
786 struct packet_command cgc;
788 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
789 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
793 * the IMMED bit -- we default to not setting it, although that
794 * would allow a much faster close, this is safer
799 return pkt_generic_packet(pd, &cgc);
803 * speed is given as the normal factor, e.g. 4 for 4x
805 static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
806 unsigned write_speed, unsigned read_speed)
808 struct packet_command cgc;
809 struct scsi_sense_hdr sshdr;
812 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
814 cgc.cmd[0] = GPCMD_SET_SPEED;
815 put_unaligned_be16(read_speed, &cgc.cmd[2]);
816 put_unaligned_be16(write_speed, &cgc.cmd[4]);
818 ret = pkt_generic_packet(pd, &cgc);
820 pkt_dump_sense(pd, &cgc);
826 * Queue a bio for processing by the low-level CD device. Must be called
827 * from process context.
829 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
831 spin_lock(&pd->iosched.lock);
832 if (bio_data_dir(bio) == READ)
833 bio_list_add(&pd->iosched.read_queue, bio);
835 bio_list_add(&pd->iosched.write_queue, bio);
836 spin_unlock(&pd->iosched.lock);
838 atomic_set(&pd->iosched.attention, 1);
839 wake_up(&pd->wqueue);
843 * Process the queued read/write requests. This function handles special
844 * requirements for CDRW drives:
845 * - A cache flush command must be inserted before a read request if the
846 * previous request was a write.
847 * - Switching between reading and writing is slow, so don't do it more often
849 * - Optimize for throughput at the expense of latency. This means that streaming
850 * writes will never be interrupted by a read, but if the drive has to seek
851 * before the next write, switch to reading instead if there are any pending
853 * - Set the read speed according to current usage pattern. When only reading
854 * from the device, it's best to use the highest possible read speed, but
855 * when switching often between reading and writing, it's better to have the
856 * same read and write speeds.
858 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
860 struct device *ddev = disk_to_dev(pd->disk);
862 if (atomic_read(&pd->iosched.attention) == 0)
864 atomic_set(&pd->iosched.attention, 0);
868 int reads_queued, writes_queued;
870 spin_lock(&pd->iosched.lock);
871 reads_queued = !bio_list_empty(&pd->iosched.read_queue);
872 writes_queued = !bio_list_empty(&pd->iosched.write_queue);
873 spin_unlock(&pd->iosched.lock);
875 if (!reads_queued && !writes_queued)
878 if (pd->iosched.writing) {
879 int need_write_seek = 1;
880 spin_lock(&pd->iosched.lock);
881 bio = bio_list_peek(&pd->iosched.write_queue);
882 spin_unlock(&pd->iosched.lock);
883 if (bio && (bio->bi_iter.bi_sector ==
884 pd->iosched.last_write))
886 if (need_write_seek && reads_queued) {
887 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
888 dev_dbg(ddev, "write, waiting\n");
892 pd->iosched.writing = 0;
895 if (!reads_queued && writes_queued) {
896 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
897 dev_dbg(ddev, "read, waiting\n");
900 pd->iosched.writing = 1;
904 spin_lock(&pd->iosched.lock);
905 if (pd->iosched.writing)
906 bio = bio_list_pop(&pd->iosched.write_queue);
908 bio = bio_list_pop(&pd->iosched.read_queue);
909 spin_unlock(&pd->iosched.lock);
914 if (bio_data_dir(bio) == READ)
915 pd->iosched.successive_reads +=
916 bio->bi_iter.bi_size >> 10;
918 pd->iosched.successive_reads = 0;
919 pd->iosched.last_write = bio_end_sector(bio);
921 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
922 if (pd->read_speed == pd->write_speed) {
923 pd->read_speed = MAX_SPEED;
924 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
927 if (pd->read_speed != pd->write_speed) {
928 pd->read_speed = pd->write_speed;
929 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
933 atomic_inc(&pd->cdrw.pending_bios);
934 submit_bio_noacct(bio);
939 * Special care is needed if the underlying block device has a small
940 * max_phys_segments value.
942 static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
944 struct device *ddev = disk_to_dev(pd->disk);
946 if ((pd->settings.size << 9) / CD_FRAMESIZE <= queue_max_segments(q)) {
948 * The cdrom device can handle one segment/frame
950 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
954 if ((pd->settings.size << 9) / PAGE_SIZE <= queue_max_segments(q)) {
956 * We can handle this case at the expense of some extra memory
957 * copies during write operations
959 set_bit(PACKET_MERGE_SEGS, &pd->flags);
963 dev_err(ddev, "cdrom max_phys_segments too small\n");
967 static void pkt_end_io_read(struct bio *bio)
969 struct packet_data *pkt = bio->bi_private;
970 struct pktcdvd_device *pd = pkt->pd;
973 dev_dbg(disk_to_dev(pd->disk), "bio=%p sec0=%llx sec=%llx err=%d\n",
974 bio, pkt->sector, bio->bi_iter.bi_sector, bio->bi_status);
977 atomic_inc(&pkt->io_errors);
979 if (atomic_dec_and_test(&pkt->io_wait)) {
980 atomic_inc(&pkt->run_sm);
981 wake_up(&pd->wqueue);
983 pkt_bio_finished(pd);
986 static void pkt_end_io_packet_write(struct bio *bio)
988 struct packet_data *pkt = bio->bi_private;
989 struct pktcdvd_device *pd = pkt->pd;
992 dev_dbg(disk_to_dev(pd->disk), "id=%d, err=%d\n", pkt->id, bio->bi_status);
994 pd->stats.pkt_ended++;
997 pkt_bio_finished(pd);
998 atomic_dec(&pkt->io_wait);
999 atomic_inc(&pkt->run_sm);
1000 wake_up(&pd->wqueue);
1004 * Schedule reads for the holes in a packet
1006 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1008 struct device *ddev = disk_to_dev(pd->disk);
1009 int frames_read = 0;
1012 char written[PACKET_MAX_SIZE];
1014 BUG_ON(bio_list_empty(&pkt->orig_bios));
1016 atomic_set(&pkt->io_wait, 0);
1017 atomic_set(&pkt->io_errors, 0);
1020 * Figure out which frames we need to read before we can write.
1022 memset(written, 0, sizeof(written));
1023 spin_lock(&pkt->lock);
1024 bio_list_for_each(bio, &pkt->orig_bios) {
1025 int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
1026 (CD_FRAMESIZE >> 9);
1027 int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
1028 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
1029 BUG_ON(first_frame < 0);
1030 BUG_ON(first_frame + num_frames > pkt->frames);
1031 for (f = first_frame; f < first_frame + num_frames; f++)
1034 spin_unlock(&pkt->lock);
1036 if (pkt->cache_valid) {
1037 dev_dbg(ddev, "zone %llx cached\n", pkt->sector);
1042 * Schedule reads for missing parts of the packet.
1044 for (f = 0; f < pkt->frames; f++) {
1050 bio = pkt->r_bios[f];
1051 bio_init(bio, pd->bdev_handle->bdev, bio->bi_inline_vecs, 1,
1053 bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1054 bio->bi_end_io = pkt_end_io_read;
1055 bio->bi_private = pkt;
1057 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1058 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1059 dev_dbg(ddev, "Adding frame %d, page:%p offs:%d\n", f,
1060 pkt->pages[p], offset);
1061 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1064 atomic_inc(&pkt->io_wait);
1065 pkt_queue_bio(pd, bio);
1070 dev_dbg(ddev, "need %d frames for zone %llx\n", frames_read, pkt->sector);
1071 pd->stats.pkt_started++;
1072 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1076 * Find a packet matching zone, or the least recently used packet if
1077 * there is no match.
1079 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1081 struct packet_data *pkt;
1083 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1084 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1085 list_del_init(&pkt->list);
1086 if (pkt->sector != zone)
1087 pkt->cache_valid = 0;
1095 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1097 if (pkt->cache_valid) {
1098 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1100 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1104 static inline void pkt_set_state(struct device *ddev, struct packet_data *pkt,
1105 enum packet_data_state state)
1107 static const char *state_name[] = {
1108 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1110 enum packet_data_state old_state = pkt->state;
1112 dev_dbg(ddev, "pkt %2d : s=%6llx %s -> %s\n",
1113 pkt->id, pkt->sector, state_name[old_state], state_name[state]);
1119 * Scan the work queue to see if we can start a new packet.
1120 * returns non-zero if any work was done.
1122 static int pkt_handle_queue(struct pktcdvd_device *pd)
1124 struct device *ddev = disk_to_dev(pd->disk);
1125 struct packet_data *pkt, *p;
1126 struct bio *bio = NULL;
1127 sector_t zone = 0; /* Suppress gcc warning */
1128 struct pkt_rb_node *node, *first_node;
1131 atomic_set(&pd->scan_queue, 0);
1133 if (list_empty(&pd->cdrw.pkt_free_list)) {
1134 dev_dbg(ddev, "no pkt\n");
1139 * Try to find a zone we are not already working on.
1141 spin_lock(&pd->lock);
1142 first_node = pkt_rbtree_find(pd, pd->current_sector);
1144 n = rb_first(&pd->bio_queue);
1146 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1151 zone = get_zone(bio->bi_iter.bi_sector, pd);
1152 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1153 if (p->sector == zone) {
1160 node = pkt_rbtree_next(node);
1162 n = rb_first(&pd->bio_queue);
1164 node = rb_entry(n, struct pkt_rb_node, rb_node);
1166 if (node == first_node)
1169 spin_unlock(&pd->lock);
1171 dev_dbg(ddev, "no bio\n");
1175 pkt = pkt_get_packet_data(pd, zone);
1177 pd->current_sector = zone + pd->settings.size;
1179 BUG_ON(pkt->frames != pd->settings.size >> 2);
1180 pkt->write_size = 0;
1183 * Scan work queue for bios in the same zone and link them
1186 spin_lock(&pd->lock);
1187 dev_dbg(ddev, "looking for zone %llx\n", zone);
1188 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1189 sector_t tmp = get_zone(node->bio->bi_iter.bi_sector, pd);
1192 dev_dbg(ddev, "found zone=%llx\n", tmp);
1195 pkt_rbtree_erase(pd, node);
1196 spin_lock(&pkt->lock);
1197 bio_list_add(&pkt->orig_bios, bio);
1198 pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
1199 spin_unlock(&pkt->lock);
1201 /* check write congestion marks, and if bio_queue_size is
1202 * below, wake up any waiters
1204 if (pd->congested &&
1205 pd->bio_queue_size <= pd->write_congestion_off) {
1206 pd->congested = false;
1207 wake_up_var(&pd->congested);
1209 spin_unlock(&pd->lock);
1211 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1212 pkt_set_state(ddev, pkt, PACKET_WAITING_STATE);
1213 atomic_set(&pkt->run_sm, 1);
1215 spin_lock(&pd->cdrw.active_list_lock);
1216 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1217 spin_unlock(&pd->cdrw.active_list_lock);
1223 * bio_list_copy_data - copy contents of data buffers from one chain of bios to
1225 * @src: source bio list
1226 * @dst: destination bio list
1228 * Stops when it reaches the end of either the @src list or @dst list - that is,
1229 * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of
1232 static void bio_list_copy_data(struct bio *dst, struct bio *src)
1234 struct bvec_iter src_iter = src->bi_iter;
1235 struct bvec_iter dst_iter = dst->bi_iter;
1238 if (!src_iter.bi_size) {
1243 src_iter = src->bi_iter;
1246 if (!dst_iter.bi_size) {
1251 dst_iter = dst->bi_iter;
1254 bio_copy_data_iter(dst, &dst_iter, src, &src_iter);
1259 * Assemble a bio to write one packet and queue the bio for processing
1260 * by the underlying block device.
1262 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1264 struct device *ddev = disk_to_dev(pd->disk);
1267 bio_init(pkt->w_bio, pd->bdev_handle->bdev, pkt->w_bio->bi_inline_vecs,
1268 pkt->frames, REQ_OP_WRITE);
1269 pkt->w_bio->bi_iter.bi_sector = pkt->sector;
1270 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1271 pkt->w_bio->bi_private = pkt;
1274 for (f = 0; f < pkt->frames; f++) {
1275 struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1276 unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1278 if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
1281 dev_dbg(ddev, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
1284 * Fill-in bvec with data from orig_bios.
1286 spin_lock(&pkt->lock);
1287 bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
1289 pkt_set_state(ddev, pkt, PACKET_WRITE_WAIT_STATE);
1290 spin_unlock(&pkt->lock);
1292 dev_dbg(ddev, "Writing %d frames for zone %llx\n", pkt->write_size, pkt->sector);
1294 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
1295 pkt->cache_valid = 1;
1297 pkt->cache_valid = 0;
1299 /* Start the write request */
1300 atomic_set(&pkt->io_wait, 1);
1301 pkt_queue_bio(pd, pkt->w_bio);
1304 static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
1309 pkt->cache_valid = 0;
1311 /* Finish all bios corresponding to this packet */
1312 while ((bio = bio_list_pop(&pkt->orig_bios))) {
1313 bio->bi_status = status;
1318 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1320 struct device *ddev = disk_to_dev(pd->disk);
1322 dev_dbg(ddev, "pkt %d\n", pkt->id);
1325 switch (pkt->state) {
1326 case PACKET_WAITING_STATE:
1327 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1330 pkt->sleep_time = 0;
1331 pkt_gather_data(pd, pkt);
1332 pkt_set_state(ddev, pkt, PACKET_READ_WAIT_STATE);
1335 case PACKET_READ_WAIT_STATE:
1336 if (atomic_read(&pkt->io_wait) > 0)
1339 if (atomic_read(&pkt->io_errors) > 0) {
1340 pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE);
1342 pkt_start_write(pd, pkt);
1346 case PACKET_WRITE_WAIT_STATE:
1347 if (atomic_read(&pkt->io_wait) > 0)
1350 if (!pkt->w_bio->bi_status) {
1351 pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE);
1353 pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE);
1357 case PACKET_RECOVERY_STATE:
1358 dev_dbg(ddev, "No recovery possible\n");
1359 pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE);
1362 case PACKET_FINISHED_STATE:
1363 pkt_finish_packet(pkt, pkt->w_bio->bi_status);
1373 static void pkt_handle_packets(struct pktcdvd_device *pd)
1375 struct device *ddev = disk_to_dev(pd->disk);
1376 struct packet_data *pkt, *next;
1379 * Run state machine for active packets
1381 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1382 if (atomic_read(&pkt->run_sm) > 0) {
1383 atomic_set(&pkt->run_sm, 0);
1384 pkt_run_state_machine(pd, pkt);
1389 * Move no longer active packets to the free list
1391 spin_lock(&pd->cdrw.active_list_lock);
1392 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1393 if (pkt->state == PACKET_FINISHED_STATE) {
1394 list_del(&pkt->list);
1395 pkt_put_packet_data(pd, pkt);
1396 pkt_set_state(ddev, pkt, PACKET_IDLE_STATE);
1397 atomic_set(&pd->scan_queue, 1);
1400 spin_unlock(&pd->cdrw.active_list_lock);
1404 * kcdrwd is woken up when writes have been queued for one of our
1405 * registered devices
1407 static int kcdrwd(void *foobar)
1409 struct pktcdvd_device *pd = foobar;
1410 struct device *ddev = disk_to_dev(pd->disk);
1411 struct packet_data *pkt;
1412 int states[PACKET_NUM_STATES];
1413 long min_sleep_time, residue;
1415 set_user_nice(current, MIN_NICE);
1419 DECLARE_WAITQUEUE(wait, current);
1422 * Wait until there is something to do
1424 add_wait_queue(&pd->wqueue, &wait);
1426 set_current_state(TASK_INTERRUPTIBLE);
1428 /* Check if we need to run pkt_handle_queue */
1429 if (atomic_read(&pd->scan_queue) > 0)
1432 /* Check if we need to run the state machine for some packet */
1433 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1434 if (atomic_read(&pkt->run_sm) > 0)
1438 /* Check if we need to process the iosched queues */
1439 if (atomic_read(&pd->iosched.attention) != 0)
1442 /* Otherwise, go to sleep */
1443 pkt_count_states(pd, states);
1444 dev_dbg(ddev, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1445 states[0], states[1], states[2], states[3], states[4], states[5]);
1447 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1448 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1449 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1450 min_sleep_time = pkt->sleep_time;
1453 dev_dbg(ddev, "sleeping\n");
1454 residue = schedule_timeout(min_sleep_time);
1455 dev_dbg(ddev, "wake up\n");
1457 /* make swsusp happy with our thread */
1460 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1461 if (!pkt->sleep_time)
1463 pkt->sleep_time -= min_sleep_time - residue;
1464 if (pkt->sleep_time <= 0) {
1465 pkt->sleep_time = 0;
1466 atomic_inc(&pkt->run_sm);
1470 if (kthread_should_stop())
1474 set_current_state(TASK_RUNNING);
1475 remove_wait_queue(&pd->wqueue, &wait);
1477 if (kthread_should_stop())
1481 * if pkt_handle_queue returns true, we can queue
1484 while (pkt_handle_queue(pd))
1488 * Handle packet state machine
1490 pkt_handle_packets(pd);
1493 * Handle iosched queues
1495 pkt_iosched_process_queue(pd);
1501 static void pkt_print_settings(struct pktcdvd_device *pd)
1503 dev_info(disk_to_dev(pd->disk), "%s packets, %u blocks, Mode-%c disc\n",
1504 pd->settings.fp ? "Fixed" : "Variable",
1505 pd->settings.size >> 2,
1506 pd->settings.block_mode == 8 ? '1' : '2');
1509 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1511 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1513 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1514 cgc->cmd[2] = page_code | (page_control << 6);
1515 put_unaligned_be16(cgc->buflen, &cgc->cmd[7]);
1516 cgc->data_direction = CGC_DATA_READ;
1517 return pkt_generic_packet(pd, cgc);
1520 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1522 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1523 memset(cgc->buffer, 0, 2);
1524 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1525 cgc->cmd[1] = 0x10; /* PF */
1526 put_unaligned_be16(cgc->buflen, &cgc->cmd[7]);
1527 cgc->data_direction = CGC_DATA_WRITE;
1528 return pkt_generic_packet(pd, cgc);
1531 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1533 struct packet_command cgc;
1536 /* set up command and get the disc info */
1537 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1538 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1539 cgc.cmd[8] = cgc.buflen = 2;
1542 ret = pkt_generic_packet(pd, &cgc);
1546 /* not all drives have the same disc_info length, so requeue
1547 * packet with the length the drive tells us it can supply
1549 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1550 sizeof(di->disc_information_length);
1552 if (cgc.buflen > sizeof(disc_information))
1553 cgc.buflen = sizeof(disc_information);
1555 cgc.cmd[8] = cgc.buflen;
1556 return pkt_generic_packet(pd, &cgc);
1559 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1561 struct packet_command cgc;
1564 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1565 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1566 cgc.cmd[1] = type & 3;
1567 put_unaligned_be16(track, &cgc.cmd[4]);
1571 ret = pkt_generic_packet(pd, &cgc);
1575 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1576 sizeof(ti->track_information_length);
1578 if (cgc.buflen > sizeof(track_information))
1579 cgc.buflen = sizeof(track_information);
1581 cgc.cmd[8] = cgc.buflen;
1582 return pkt_generic_packet(pd, &cgc);
1585 static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1588 disc_information di;
1589 track_information ti;
1593 ret = pkt_get_disc_info(pd, &di);
1597 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1598 ret = pkt_get_track_info(pd, last_track, 1, &ti);
1602 /* if this track is blank, try the previous. */
1605 ret = pkt_get_track_info(pd, last_track, 1, &ti);
1610 /* if last recorded field is valid, return it. */
1612 *last_written = be32_to_cpu(ti.last_rec_address);
1614 /* make it up instead */
1615 *last_written = be32_to_cpu(ti.track_start) +
1616 be32_to_cpu(ti.track_size);
1618 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1624 * write mode select package based on pd->settings
1626 static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
1628 struct device *ddev = disk_to_dev(pd->disk);
1629 struct packet_command cgc;
1630 struct scsi_sense_hdr sshdr;
1631 write_param_page *wp;
1635 /* doesn't apply to DVD+RW or DVD-RAM */
1636 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1639 memset(buffer, 0, sizeof(buffer));
1640 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1642 ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
1644 pkt_dump_sense(pd, &cgc);
1648 size = 2 + get_unaligned_be16(&buffer[0]);
1649 pd->mode_offset = get_unaligned_be16(&buffer[6]);
1650 if (size > sizeof(buffer))
1651 size = sizeof(buffer);
1656 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1658 ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
1660 pkt_dump_sense(pd, &cgc);
1665 * write page is offset header + block descriptor length
1667 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1669 wp->fp = pd->settings.fp;
1670 wp->track_mode = pd->settings.track_mode;
1671 wp->write_type = pd->settings.write_type;
1672 wp->data_block_type = pd->settings.block_mode;
1674 wp->multi_session = 0;
1676 #ifdef PACKET_USE_LS
1681 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1682 wp->session_format = 0;
1684 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1685 wp->session_format = 0x20;
1689 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1695 dev_err(ddev, "write mode wrong %d\n", wp->data_block_type);
1698 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1700 cgc.buflen = cgc.cmd[8] = size;
1701 ret = pkt_mode_select(pd, &cgc);
1703 pkt_dump_sense(pd, &cgc);
1707 pkt_print_settings(pd);
1712 * 1 -- we can write to this track, 0 -- we can't
1714 static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1716 struct device *ddev = disk_to_dev(pd->disk);
1718 switch (pd->mmc3_profile) {
1719 case 0x1a: /* DVD+RW */
1720 case 0x12: /* DVD-RAM */
1721 /* The track is always writable on DVD+RW/DVD-RAM */
1727 if (!ti->packet || !ti->fp)
1731 * "good" settings as per Mt Fuji.
1733 if (ti->rt == 0 && ti->blank == 0)
1736 if (ti->rt == 0 && ti->blank == 1)
1739 if (ti->rt == 1 && ti->blank == 0)
1742 dev_err(ddev, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1747 * 1 -- we can write to this disc, 0 -- we can't
1749 static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1751 struct device *ddev = disk_to_dev(pd->disk);
1753 switch (pd->mmc3_profile) {
1754 case 0x0a: /* CD-RW */
1755 case 0xffff: /* MMC3 not supported */
1757 case 0x1a: /* DVD+RW */
1758 case 0x13: /* DVD-RW */
1759 case 0x12: /* DVD-RAM */
1762 dev_dbg(ddev, "Wrong disc profile (%x)\n", pd->mmc3_profile);
1767 * for disc type 0xff we should probably reserve a new track.
1768 * but i'm not sure, should we leave this to user apps? probably.
1770 if (di->disc_type == 0xff) {
1771 dev_notice(ddev, "unknown disc - no track?\n");
1775 if (di->disc_type != 0x20 && di->disc_type != 0) {
1776 dev_err(ddev, "wrong disc type (%x)\n", di->disc_type);
1780 if (di->erasable == 0) {
1781 dev_err(ddev, "disc not erasable\n");
1785 if (di->border_status == PACKET_SESSION_RESERVED) {
1786 dev_err(ddev, "can't write to last track (reserved)\n");
1793 static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
1795 struct device *ddev = disk_to_dev(pd->disk);
1796 struct packet_command cgc;
1797 unsigned char buf[12];
1798 disc_information di;
1799 track_information ti;
1802 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1803 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1805 ret = pkt_generic_packet(pd, &cgc);
1806 pd->mmc3_profile = ret ? 0xffff : get_unaligned_be16(&buf[6]);
1808 memset(&di, 0, sizeof(disc_information));
1809 memset(&ti, 0, sizeof(track_information));
1811 ret = pkt_get_disc_info(pd, &di);
1813 dev_err(ddev, "failed get_disc\n");
1817 if (!pkt_writable_disc(pd, &di))
1820 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1822 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1823 ret = pkt_get_track_info(pd, track, 1, &ti);
1825 dev_err(ddev, "failed get_track\n");
1829 if (!pkt_writable_track(pd, &ti)) {
1830 dev_err(ddev, "can't write to this track\n");
1835 * we keep packet size in 512 byte units, makes it easier to
1836 * deal with request calculations.
1838 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1839 if (pd->settings.size == 0) {
1840 dev_notice(ddev, "detected zero packet size!\n");
1843 if (pd->settings.size > PACKET_MAX_SECTORS) {
1844 dev_err(ddev, "packet size is too big\n");
1847 pd->settings.fp = ti.fp;
1848 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1851 pd->nwa = be32_to_cpu(ti.next_writable);
1852 set_bit(PACKET_NWA_VALID, &pd->flags);
1856 * in theory we could use lra on -RW media as well and just zero
1857 * blocks that haven't been written yet, but in practice that
1858 * is just a no-go. we'll use that for -R, naturally.
1861 pd->lra = be32_to_cpu(ti.last_rec_address);
1862 set_bit(PACKET_LRA_VALID, &pd->flags);
1864 pd->lra = 0xffffffff;
1865 set_bit(PACKET_LRA_VALID, &pd->flags);
1871 pd->settings.link_loss = 7;
1872 pd->settings.write_type = 0; /* packet */
1873 pd->settings.track_mode = ti.track_mode;
1876 * mode1 or mode2 disc
1878 switch (ti.data_mode) {
1880 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1883 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1886 dev_err(ddev, "unknown data mode\n");
1893 * enable/disable write caching on drive
1895 static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd)
1897 struct device *ddev = disk_to_dev(pd->disk);
1898 struct packet_command cgc;
1899 struct scsi_sense_hdr sshdr;
1900 unsigned char buf[64];
1901 bool set = IS_ENABLED(CONFIG_CDROM_PKTCDVD_WCACHE);
1904 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1906 cgc.buflen = pd->mode_offset + 12;
1909 * caching mode page might not be there, so quiet this command
1913 ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
1918 * use drive write caching -- we need deferred error handling to be
1919 * able to successfully recover with this option (drive will return good
1920 * status as soon as the cdb is validated).
1922 buf[pd->mode_offset + 10] |= (set << 2);
1924 cgc.buflen = cgc.cmd[8] = 2 + get_unaligned_be16(&buf[0]);
1925 ret = pkt_mode_select(pd, &cgc);
1927 dev_err(ddev, "write caching control failed\n");
1928 pkt_dump_sense(pd, &cgc);
1929 } else if (!ret && set)
1930 dev_notice(ddev, "enabled write caching\n");
1934 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1936 struct packet_command cgc;
1938 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1939 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1940 cgc.cmd[4] = lockflag ? 1 : 0;
1941 return pkt_generic_packet(pd, &cgc);
1945 * Returns drive maximum write speed
1947 static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
1948 unsigned *write_speed)
1950 struct packet_command cgc;
1951 struct scsi_sense_hdr sshdr;
1952 unsigned char buf[256+18];
1953 unsigned char *cap_buf;
1956 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1957 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1960 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1962 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1963 sizeof(struct mode_page_header);
1964 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1966 pkt_dump_sense(pd, &cgc);
1971 offset = 20; /* Obsoleted field, used by older drives */
1972 if (cap_buf[1] >= 28)
1973 offset = 28; /* Current write speed selected */
1974 if (cap_buf[1] >= 30) {
1975 /* If the drive reports at least one "Logical Unit Write
1976 * Speed Performance Descriptor Block", use the information
1977 * in the first block. (contains the highest speed)
1979 int num_spdb = get_unaligned_be16(&cap_buf[30]);
1984 *write_speed = get_unaligned_be16(&cap_buf[offset]);
1988 /* These tables from cdrecord - I don't have orange book */
1989 /* standard speed CD-RW (1-4x) */
1990 static char clv_to_speed[16] = {
1991 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1992 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1994 /* high speed CD-RW (-10x) */
1995 static char hs_clv_to_speed[16] = {
1996 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1997 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1999 /* ultra high speed CD-RW */
2000 static char us_clv_to_speed[16] = {
2001 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2002 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2006 * reads the maximum media speed from ATIP
2008 static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2011 struct device *ddev = disk_to_dev(pd->disk);
2012 struct packet_command cgc;
2013 struct scsi_sense_hdr sshdr;
2014 unsigned char buf[64];
2015 unsigned int size, st, sp;
2018 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2020 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2022 cgc.cmd[2] = 4; /* READ ATIP */
2024 ret = pkt_generic_packet(pd, &cgc);
2026 pkt_dump_sense(pd, &cgc);
2029 size = 2 + get_unaligned_be16(&buf[0]);
2030 if (size > sizeof(buf))
2033 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2035 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2039 ret = pkt_generic_packet(pd, &cgc);
2041 pkt_dump_sense(pd, &cgc);
2045 if (!(buf[6] & 0x40)) {
2046 dev_notice(ddev, "disc type is not CD-RW\n");
2049 if (!(buf[6] & 0x4)) {
2050 dev_notice(ddev, "A1 values on media are not valid, maybe not CDRW?\n");
2054 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2056 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2058 /* Info from cdrecord */
2060 case 0: /* standard speed */
2061 *speed = clv_to_speed[sp];
2063 case 1: /* high speed */
2064 *speed = hs_clv_to_speed[sp];
2066 case 2: /* ultra high speed */
2067 *speed = us_clv_to_speed[sp];
2070 dev_notice(ddev, "unknown disc sub-type %d\n", st);
2074 dev_info(ddev, "maximum media speed: %d\n", *speed);
2077 dev_notice(ddev, "unknown speed %d for sub-type %d\n", sp, st);
2082 static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
2084 struct device *ddev = disk_to_dev(pd->disk);
2085 struct packet_command cgc;
2086 struct scsi_sense_hdr sshdr;
2089 dev_dbg(ddev, "Performing OPC\n");
2091 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2093 cgc.timeout = 60*HZ;
2094 cgc.cmd[0] = GPCMD_SEND_OPC;
2096 ret = pkt_generic_packet(pd, &cgc);
2098 pkt_dump_sense(pd, &cgc);
2102 static int pkt_open_write(struct pktcdvd_device *pd)
2104 struct device *ddev = disk_to_dev(pd->disk);
2106 unsigned int write_speed, media_write_speed, read_speed;
2108 ret = pkt_probe_settings(pd);
2110 dev_dbg(ddev, "failed probe\n");
2114 ret = pkt_set_write_settings(pd);
2116 dev_notice(ddev, "failed saving write settings\n");
2120 pkt_write_caching(pd);
2122 ret = pkt_get_max_speed(pd, &write_speed);
2124 write_speed = 16 * 177;
2125 switch (pd->mmc3_profile) {
2126 case 0x13: /* DVD-RW */
2127 case 0x1a: /* DVD+RW */
2128 case 0x12: /* DVD-RAM */
2129 dev_notice(ddev, "write speed %ukB/s\n", write_speed);
2132 ret = pkt_media_speed(pd, &media_write_speed);
2134 media_write_speed = 16;
2135 write_speed = min(write_speed, media_write_speed * 177);
2136 dev_notice(ddev, "write speed %ux\n", write_speed / 176);
2139 read_speed = write_speed;
2141 ret = pkt_set_speed(pd, write_speed, read_speed);
2143 dev_notice(ddev, "couldn't set write speed\n");
2146 pd->write_speed = write_speed;
2147 pd->read_speed = read_speed;
2149 ret = pkt_perform_opc(pd);
2151 dev_notice(ddev, "Optimum Power Calibration failed\n");
2157 * called at open time.
2159 static int pkt_open_dev(struct pktcdvd_device *pd, bool write)
2161 struct device *ddev = disk_to_dev(pd->disk);
2164 struct request_queue *q;
2165 struct bdev_handle *bdev_handle;
2168 * We need to re-open the cdrom device without O_NONBLOCK to be able
2169 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2170 * so open should not fail.
2172 bdev_handle = bdev_open_by_dev(pd->bdev_handle->bdev->bd_dev,
2173 BLK_OPEN_READ, pd, NULL);
2174 if (IS_ERR(bdev_handle)) {
2175 ret = PTR_ERR(bdev_handle);
2178 pd->open_bdev_handle = bdev_handle;
2180 ret = pkt_get_last_written(pd, &lba);
2182 dev_err(ddev, "pkt_get_last_written failed\n");
2186 set_capacity(pd->disk, lba << 2);
2187 set_capacity_and_notify(pd->bdev_handle->bdev->bd_disk, lba << 2);
2189 q = bdev_get_queue(pd->bdev_handle->bdev);
2191 ret = pkt_open_write(pd);
2195 * Some CDRW drives can not handle writes larger than one packet,
2196 * even if the size is a multiple of the packet size.
2198 blk_queue_max_hw_sectors(q, pd->settings.size);
2199 set_bit(PACKET_WRITABLE, &pd->flags);
2201 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2202 clear_bit(PACKET_WRITABLE, &pd->flags);
2205 ret = pkt_set_segment_merging(pd, q);
2210 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2211 dev_err(ddev, "not enough memory for buffers\n");
2215 dev_info(ddev, "%lukB available on disc\n", lba << 1);
2221 bdev_release(bdev_handle);
2227 * called when the device is closed. makes sure that the device flushes
2228 * the internal cache before we close.
2230 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2232 struct device *ddev = disk_to_dev(pd->disk);
2234 if (flush && pkt_flush_cache(pd))
2235 dev_notice(ddev, "not flushing cache\n");
2237 pkt_lock_door(pd, 0);
2239 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2240 bdev_release(pd->open_bdev_handle);
2241 pd->open_bdev_handle = NULL;
2243 pkt_shrink_pktlist(pd);
2246 static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
2248 if (dev_minor >= MAX_WRITERS)
2251 dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
2252 return pkt_devs[dev_minor];
2255 static int pkt_open(struct gendisk *disk, blk_mode_t mode)
2257 struct pktcdvd_device *pd = NULL;
2260 mutex_lock(&pktcdvd_mutex);
2261 mutex_lock(&ctl_mutex);
2262 pd = pkt_find_dev_from_minor(disk->first_minor);
2267 BUG_ON(pd->refcnt < 0);
2270 if (pd->refcnt > 1) {
2271 if ((mode & BLK_OPEN_WRITE) &&
2272 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2277 ret = pkt_open_dev(pd, mode & BLK_OPEN_WRITE);
2281 * needed here as well, since ext2 (among others) may change
2282 * the blocksize at mount time
2284 set_blocksize(disk->part0, CD_FRAMESIZE);
2286 mutex_unlock(&ctl_mutex);
2287 mutex_unlock(&pktcdvd_mutex);
2293 mutex_unlock(&ctl_mutex);
2294 mutex_unlock(&pktcdvd_mutex);
2298 static void pkt_release(struct gendisk *disk)
2300 struct pktcdvd_device *pd = disk->private_data;
2302 mutex_lock(&pktcdvd_mutex);
2303 mutex_lock(&ctl_mutex);
2305 BUG_ON(pd->refcnt < 0);
2306 if (pd->refcnt == 0) {
2307 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2308 pkt_release_dev(pd, flush);
2310 mutex_unlock(&ctl_mutex);
2311 mutex_unlock(&pktcdvd_mutex);
2315 static void pkt_end_io_read_cloned(struct bio *bio)
2317 struct packet_stacked_data *psd = bio->bi_private;
2318 struct pktcdvd_device *pd = psd->pd;
2320 psd->bio->bi_status = bio->bi_status;
2322 bio_endio(psd->bio);
2323 mempool_free(psd, &psd_pool);
2324 pkt_bio_finished(pd);
2327 static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
2329 struct bio *cloned_bio = bio_alloc_clone(pd->bdev_handle->bdev, bio,
2330 GFP_NOIO, &pkt_bio_set);
2331 struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
2335 cloned_bio->bi_private = psd;
2336 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2337 pd->stats.secs_r += bio_sectors(bio);
2338 pkt_queue_bio(pd, cloned_bio);
2341 static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
2343 struct pktcdvd_device *pd = q->queuedata;
2345 struct packet_data *pkt;
2346 int was_empty, blocked_bio;
2347 struct pkt_rb_node *node;
2349 zone = get_zone(bio->bi_iter.bi_sector, pd);
2352 * If we find a matching packet in state WAITING or READ_WAIT, we can
2353 * just append this bio to that packet.
2355 spin_lock(&pd->cdrw.active_list_lock);
2357 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2358 if (pkt->sector == zone) {
2359 spin_lock(&pkt->lock);
2360 if ((pkt->state == PACKET_WAITING_STATE) ||
2361 (pkt->state == PACKET_READ_WAIT_STATE)) {
2362 bio_list_add(&pkt->orig_bios, bio);
2364 bio->bi_iter.bi_size / CD_FRAMESIZE;
2365 if ((pkt->write_size >= pkt->frames) &&
2366 (pkt->state == PACKET_WAITING_STATE)) {
2367 atomic_inc(&pkt->run_sm);
2368 wake_up(&pd->wqueue);
2370 spin_unlock(&pkt->lock);
2371 spin_unlock(&pd->cdrw.active_list_lock);
2376 spin_unlock(&pkt->lock);
2379 spin_unlock(&pd->cdrw.active_list_lock);
2382 * Test if there is enough room left in the bio work queue
2383 * (queue size >= congestion on mark).
2384 * If not, wait till the work queue size is below the congestion off mark.
2386 spin_lock(&pd->lock);
2387 if (pd->write_congestion_on > 0
2388 && pd->bio_queue_size >= pd->write_congestion_on) {
2389 struct wait_bit_queue_entry wqe;
2391 init_wait_var_entry(&wqe, &pd->congested, 0);
2393 prepare_to_wait_event(__var_waitqueue(&pd->congested),
2395 TASK_UNINTERRUPTIBLE);
2396 if (pd->bio_queue_size <= pd->write_congestion_off)
2398 pd->congested = true;
2399 spin_unlock(&pd->lock);
2401 spin_lock(&pd->lock);
2404 spin_unlock(&pd->lock);
2407 * No matching packet found. Store the bio in the work queue.
2409 node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
2411 spin_lock(&pd->lock);
2412 BUG_ON(pd->bio_queue_size < 0);
2413 was_empty = (pd->bio_queue_size == 0);
2414 pkt_rbtree_insert(pd, node);
2415 spin_unlock(&pd->lock);
2418 * Wake up the worker thread.
2420 atomic_set(&pd->scan_queue, 1);
2422 /* This wake_up is required for correct operation */
2423 wake_up(&pd->wqueue);
2424 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2426 * This wake up is not required for correct operation,
2427 * but improves performance in some cases.
2429 wake_up(&pd->wqueue);
2433 static void pkt_submit_bio(struct bio *bio)
2435 struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata;
2436 struct device *ddev = disk_to_dev(pd->disk);
2439 bio = bio_split_to_limits(bio);
2443 dev_dbg(ddev, "start = %6llx stop = %6llx\n",
2444 bio->bi_iter.bi_sector, bio_end_sector(bio));
2447 * Clone READ bios so we can have our own bi_end_io callback.
2449 if (bio_data_dir(bio) == READ) {
2450 pkt_make_request_read(pd, bio);
2454 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2455 dev_notice(ddev, "WRITE for ro device (%llu)\n", bio->bi_iter.bi_sector);
2459 if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
2460 dev_err(ddev, "wrong bio size\n");
2465 sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
2466 sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
2468 if (last_zone != zone) {
2469 BUG_ON(last_zone != zone + pd->settings.size);
2471 split = bio_split(bio, last_zone -
2472 bio->bi_iter.bi_sector,
2473 GFP_NOIO, &pkt_bio_set);
2474 bio_chain(split, bio);
2479 pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split);
2480 } while (split != bio);
2487 static void pkt_init_queue(struct pktcdvd_device *pd)
2489 struct request_queue *q = pd->disk->queue;
2491 blk_queue_logical_block_size(q, CD_FRAMESIZE);
2492 blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
2496 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2498 struct device *ddev = disk_to_dev(pd->disk);
2500 struct bdev_handle *bdev_handle;
2501 struct scsi_device *sdev;
2503 if (pd->pkt_dev == dev) {
2504 dev_err(ddev, "recursive setup not allowed\n");
2507 for (i = 0; i < MAX_WRITERS; i++) {
2508 struct pktcdvd_device *pd2 = pkt_devs[i];
2511 if (pd2->bdev_handle->bdev->bd_dev == dev) {
2512 dev_err(ddev, "%pg already setup\n",
2513 pd2->bdev_handle->bdev);
2516 if (pd2->pkt_dev == dev) {
2517 dev_err(ddev, "can't chain pktcdvd devices\n");
2522 bdev_handle = bdev_open_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_NDELAY,
2524 if (IS_ERR(bdev_handle))
2525 return PTR_ERR(bdev_handle);
2526 sdev = scsi_device_from_queue(bdev_handle->bdev->bd_disk->queue);
2528 bdev_release(bdev_handle);
2531 put_device(&sdev->sdev_gendev);
2533 /* This is safe, since we have a reference from open(). */
2534 __module_get(THIS_MODULE);
2536 pd->bdev_handle = bdev_handle;
2537 set_blocksize(bdev_handle->bdev, CD_FRAMESIZE);
2541 atomic_set(&pd->cdrw.pending_bios, 0);
2542 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->disk->disk_name);
2543 if (IS_ERR(pd->cdrw.thread)) {
2544 dev_err(ddev, "can't start kernel thread\n");
2548 proc_create_single_data(pd->disk->disk_name, 0, pkt_proc, pkt_seq_show, pd);
2549 dev_notice(ddev, "writer mapped to %pg\n", bdev_handle->bdev);
2553 bdev_release(bdev_handle);
2554 /* This is safe: open() is still holding a reference. */
2555 module_put(THIS_MODULE);
2559 static int pkt_ioctl(struct block_device *bdev, blk_mode_t mode,
2560 unsigned int cmd, unsigned long arg)
2562 struct pktcdvd_device *pd = bdev->bd_disk->private_data;
2563 struct device *ddev = disk_to_dev(pd->disk);
2566 dev_dbg(ddev, "cmd %x, dev %d:%d\n", cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
2568 mutex_lock(&pktcdvd_mutex);
2572 * The door gets locked when the device is opened, so we
2573 * have to unlock it or else the eject command fails.
2575 if (pd->refcnt == 1)
2576 pkt_lock_door(pd, 0);
2579 * forward selected CDROM ioctls to CD-ROM, for UDF
2581 case CDROMMULTISESSION:
2582 case CDROMREADTOCENTRY:
2583 case CDROM_LAST_WRITTEN:
2584 case CDROM_SEND_PACKET:
2585 case SCSI_IOCTL_SEND_COMMAND:
2586 if (!bdev->bd_disk->fops->ioctl)
2589 ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
2592 dev_dbg(ddev, "Unknown ioctl (%x)\n", cmd);
2595 mutex_unlock(&pktcdvd_mutex);
2600 static unsigned int pkt_check_events(struct gendisk *disk,
2601 unsigned int clearing)
2603 struct pktcdvd_device *pd = disk->private_data;
2604 struct gendisk *attached_disk;
2608 if (!pd->bdev_handle)
2610 attached_disk = pd->bdev_handle->bdev->bd_disk;
2611 if (!attached_disk || !attached_disk->fops->check_events)
2613 return attached_disk->fops->check_events(attached_disk, clearing);
2616 static char *pkt_devnode(struct gendisk *disk, umode_t *mode)
2618 return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name);
2621 static const struct block_device_operations pktcdvd_ops = {
2622 .owner = THIS_MODULE,
2623 .submit_bio = pkt_submit_bio,
2625 .release = pkt_release,
2627 .compat_ioctl = blkdev_compat_ptr_ioctl,
2628 .check_events = pkt_check_events,
2629 .devnode = pkt_devnode,
2633 * Set up mapping from pktcdvd device to CD-ROM device.
2635 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
2639 struct pktcdvd_device *pd;
2640 struct gendisk *disk;
2642 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2644 for (idx = 0; idx < MAX_WRITERS; idx++)
2647 if (idx == MAX_WRITERS) {
2648 pr_err("max %d writers supported\n", MAX_WRITERS);
2653 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2657 ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
2658 sizeof(struct pkt_rb_node));
2662 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2663 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2664 spin_lock_init(&pd->cdrw.active_list_lock);
2666 spin_lock_init(&pd->lock);
2667 spin_lock_init(&pd->iosched.lock);
2668 bio_list_init(&pd->iosched.read_queue);
2669 bio_list_init(&pd->iosched.write_queue);
2670 init_waitqueue_head(&pd->wqueue);
2671 pd->bio_queue = RB_ROOT;
2673 pd->write_congestion_on = write_congestion_on;
2674 pd->write_congestion_off = write_congestion_off;
2677 disk = blk_alloc_disk(NUMA_NO_NODE);
2681 disk->major = pktdev_major;
2682 disk->first_minor = idx;
2684 disk->fops = &pktcdvd_ops;
2685 disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
2686 snprintf(disk->disk_name, sizeof(disk->disk_name), DRIVER_NAME"%d", idx);
2687 disk->private_data = pd;
2689 pd->pkt_dev = MKDEV(pktdev_major, idx);
2690 ret = pkt_new_dev(pd, dev);
2694 /* inherit events of the host device */
2695 disk->events = pd->bdev_handle->bdev->bd_disk->events;
2697 ret = add_disk(disk);
2701 pkt_sysfs_dev_new(pd);
2702 pkt_debugfs_dev_new(pd);
2706 *pkt_dev = pd->pkt_dev;
2708 mutex_unlock(&ctl_mutex);
2714 mempool_exit(&pd->rb_pool);
2717 mutex_unlock(&ctl_mutex);
2718 pr_err("setup of pktcdvd device failed\n");
2723 * Tear down mapping from pktcdvd device to CD-ROM device.
2725 static int pkt_remove_dev(dev_t pkt_dev)
2727 struct pktcdvd_device *pd;
2728 struct device *ddev;
2732 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2734 for (idx = 0; idx < MAX_WRITERS; idx++) {
2736 if (pd && (pd->pkt_dev == pkt_dev))
2739 if (idx == MAX_WRITERS) {
2740 pr_debug("dev not setup\n");
2745 if (pd->refcnt > 0) {
2750 ddev = disk_to_dev(pd->disk);
2752 if (!IS_ERR(pd->cdrw.thread))
2753 kthread_stop(pd->cdrw.thread);
2755 pkt_devs[idx] = NULL;
2757 pkt_debugfs_dev_remove(pd);
2758 pkt_sysfs_dev_remove(pd);
2760 bdev_release(pd->bdev_handle);
2762 remove_proc_entry(pd->disk->disk_name, pkt_proc);
2763 dev_notice(ddev, "writer unmapped\n");
2765 del_gendisk(pd->disk);
2768 mempool_exit(&pd->rb_pool);
2771 /* This is safe: open() is still holding a reference. */
2772 module_put(THIS_MODULE);
2775 mutex_unlock(&ctl_mutex);
2779 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2781 struct pktcdvd_device *pd;
2783 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2785 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2787 ctrl_cmd->dev = new_encode_dev(pd->bdev_handle->bdev->bd_dev);
2788 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2791 ctrl_cmd->pkt_dev = 0;
2793 ctrl_cmd->num_devices = MAX_WRITERS;
2795 mutex_unlock(&ctl_mutex);
2798 static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2800 void __user *argp = (void __user *)arg;
2801 struct pkt_ctrl_command ctrl_cmd;
2805 if (cmd != PACKET_CTRL_CMD)
2808 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2811 switch (ctrl_cmd.command) {
2812 case PKT_CTRL_CMD_SETUP:
2813 if (!capable(CAP_SYS_ADMIN))
2815 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
2816 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
2818 case PKT_CTRL_CMD_TEARDOWN:
2819 if (!capable(CAP_SYS_ADMIN))
2821 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
2823 case PKT_CTRL_CMD_STATUS:
2824 pkt_get_status(&ctrl_cmd);
2830 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2835 #ifdef CONFIG_COMPAT
2836 static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2838 return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2842 static const struct file_operations pkt_ctl_fops = {
2843 .open = nonseekable_open,
2844 .unlocked_ioctl = pkt_ctl_ioctl,
2845 #ifdef CONFIG_COMPAT
2846 .compat_ioctl = pkt_ctl_compat_ioctl,
2848 .owner = THIS_MODULE,
2849 .llseek = no_llseek,
2852 static struct miscdevice pkt_misc = {
2853 .minor = MISC_DYNAMIC_MINOR,
2854 .name = DRIVER_NAME,
2855 .nodename = "pktcdvd/control",
2856 .fops = &pkt_ctl_fops
2859 static int __init pkt_init(void)
2863 mutex_init(&ctl_mutex);
2865 ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
2866 sizeof(struct packet_stacked_data));
2869 ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
2871 mempool_exit(&psd_pool);
2875 ret = register_blkdev(pktdev_major, DRIVER_NAME);
2877 pr_err("unable to register block device\n");
2883 ret = pkt_sysfs_init();
2889 ret = misc_register(&pkt_misc);
2891 pr_err("unable to register misc device\n");
2895 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
2900 pkt_debugfs_cleanup();
2901 pkt_sysfs_cleanup();
2903 unregister_blkdev(pktdev_major, DRIVER_NAME);
2905 mempool_exit(&psd_pool);
2906 bioset_exit(&pkt_bio_set);
2910 static void __exit pkt_exit(void)
2912 remove_proc_entry("driver/"DRIVER_NAME, NULL);
2913 misc_deregister(&pkt_misc);
2915 pkt_debugfs_cleanup();
2916 pkt_sysfs_cleanup();
2918 unregister_blkdev(pktdev_major, DRIVER_NAME);
2919 mempool_exit(&psd_pool);
2920 bioset_exit(&pkt_bio_set);
2923 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2924 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2925 MODULE_LICENSE("GPL");
2927 module_init(pkt_init);
2928 module_exit(pkt_exit);