pktcdvd.c 73.8 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3
/*
 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4
 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
L
Linus Torvalds 已提交
5 6 7 8
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
9 10
 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
 * DVD-RAM devices.
L
Linus Torvalds 已提交
11 12 13
 *
 * Theory of operation:
 *
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
 * At the lowest level, there is the standard driver for the CD/DVD device,
 * typically ide-cd.c or sr.c. This driver can handle read and write requests,
 * but it doesn't know anything about the special restrictions that apply to
 * packet writing. One restriction is that write requests must be aligned to
 * packet boundaries on the physical media, and the size of a write request
 * must be equal to the packet size. Another restriction is that a
 * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
 * command, if the previous command was a write.
 *
 * The purpose of the packet writing driver is to hide these restrictions from
 * higher layers, such as file systems, and present a block device that can be
 * randomly read and written using 2kB-sized blocks.
 *
 * The lowest layer in the packet writing driver is the packet I/O scheduler.
 * Its data is defined by the struct packet_iosched and includes two bio
 * queues with pending read and write requests. These queues are processed
 * by the pkt_iosched_process_queue() function. The write requests in this
 * queue are already properly aligned and sized. This layer is responsible for
 * issuing the flush cache commands and scheduling the I/O in a good order.
 *
 * The next layer transforms unaligned write requests to aligned writes. This
 * transformation requires reading missing pieces of data from the underlying
 * block device, assembling the pieces to full packets and queuing them to the
 * packet I/O scheduler.
 *
 * At the top layer there is a custom make_request_fn function that forwards
 * read requests directly to the iosched queue and puts write requests in the
 * unaligned write queue. A kernel thread performs the necessary read
 * gathering to convert the unaligned writes to aligned writes and then feeds
 * them to the packet I/O scheduler.
L
Linus Torvalds 已提交
44 45 46
 *
 *************************************************************************/

47 48
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

L
Linus Torvalds 已提交
49 50 51 52
#include <linux/pktcdvd.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
53
#include <linux/compat.h>
L
Linus Torvalds 已提交
54 55 56 57 58 59 60
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
61
#include <linux/freezer.h>
62
#include <linux/mutex.h>
63
#include <linux/slab.h>
L
Linus Torvalds 已提交
64 65
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_ioctl.h>
66
#include <scsi/scsi.h>
67 68
#include <linux/debugfs.h>
#include <linux/device.h>
L
Linus Torvalds 已提交
69 70 71

#include <asm/uaccess.h>

72 73
#define DRIVER_NAME	"pktcdvd"

74 75
#define pkt_err(pd, fmt, ...)						\
	pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
76 77
#define pkt_notice(pd, fmt, ...)					\
	pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
78 79
#define pkt_info(pd, fmt, ...)						\
	pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
80

81 82 83 84 85 86 87
#define pkt_dbg(level, pd, fmt, ...)					\
do {									\
	if (level == 2 && PACKET_DEBUG >= 2)				\
		pr_notice("%s: %s():" fmt,				\
			  pd->name, __func__, ##__VA_ARGS__);		\
	else if (level == 1 && PACKET_DEBUG >= 1)			\
		pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__);		\
88
} while (0)
L
Linus Torvalds 已提交
89 90 91

#define MAX_SPEED 0xffff

92
static DEFINE_MUTEX(pktcdvd_mutex);
L
Linus Torvalds 已提交
93 94
static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
static struct proc_dir_entry *pkt_proc;
95
static int pktdev_major;
96 97
static int write_congestion_on  = PKT_WRITE_CONGESTION_ON;
static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
98
static struct mutex ctl_mutex;	/* Serialize open/close/setup/teardown */
L
Linus Torvalds 已提交
99 100
static mempool_t *psd_pool;

101
static struct class	*class_pktcdvd = NULL;    /* /sys/class/pktcdvd */
102
static struct dentry	*pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
103 104 105 106 107 108

/* forward declaration */
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
static int pkt_remove_dev(dev_t pkt_dev);
static int pkt_seq_show(struct seq_file *m, void *p);

109 110 111 112
static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
{
	return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
}
113 114 115 116 117 118 119 120 121 122

/*
 * create and register a pktcdvd kernel object.
 */
static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
					const char* name,
					struct kobject* parent,
					struct kobj_type* ktype)
{
	struct pktcdvd_kobj *p;
123 124
	int error;

125 126 127 128
	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return NULL;
	p->pd = pd;
129 130
	error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
	if (error) {
131
		kobject_put(&p->kobj);
132
		return NULL;
133
	}
134
	kobject_uevent(&p->kobj, KOBJ_ADD);
135 136 137 138 139 140 141 142
	return p;
}
/*
 * remove a pktcdvd kernel object.
 */
static void pkt_kobj_remove(struct pktcdvd_kobj *p)
{
	if (p)
143
		kobject_put(&p->kobj);
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
}
/*
 * default release function for pktcdvd kernel objects.
 */
static void pkt_kobj_release(struct kobject *kobj)
{
	kfree(to_pktcdvdkobj(kobj));
}


/**********************************************************
 *
 * sysfs interface for pktcdvd
 * by (C) 2006  Thomas Maier <balagi@justmail.de>
 *
 **********************************************************/

#define DEF_ATTR(_obj,_name,_mode) \
162
	static struct attribute _obj = { .name = _name, .mode = _mode }
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270

/**********************************************************
  /sys/class/pktcdvd/pktcdvd[0-7]/
                     stat/reset
                     stat/packets_started
                     stat/packets_finished
                     stat/kb_written
                     stat/kb_read
                     stat/kb_read_gather
                     write_queue/size
                     write_queue/congestion_off
                     write_queue/congestion_on
 **********************************************************/

DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);

static struct attribute *kobj_pkt_attrs_stat[] = {
	&kobj_pkt_attr_st1,
	&kobj_pkt_attr_st2,
	&kobj_pkt_attr_st3,
	&kobj_pkt_attr_st4,
	&kobj_pkt_attr_st5,
	&kobj_pkt_attr_st6,
	NULL
};

DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on",  0644);

static struct attribute *kobj_pkt_attrs_wqueue[] = {
	&kobj_pkt_attr_wq1,
	&kobj_pkt_attr_wq2,
	&kobj_pkt_attr_wq3,
	NULL
};

static ssize_t kobj_pkt_show(struct kobject *kobj,
			struct attribute *attr, char *data)
{
	struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
	int n = 0;
	int v;
	if (strcmp(attr->name, "packets_started") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.pkt_started);

	} else if (strcmp(attr->name, "packets_finished") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.pkt_ended);

	} else if (strcmp(attr->name, "kb_written") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);

	} else if (strcmp(attr->name, "kb_read") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);

	} else if (strcmp(attr->name, "kb_read_gather") == 0) {
		n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);

	} else if (strcmp(attr->name, "size") == 0) {
		spin_lock(&pd->lock);
		v = pd->bio_queue_size;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);

	} else if (strcmp(attr->name, "congestion_off") == 0) {
		spin_lock(&pd->lock);
		v = pd->write_congestion_off;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);

	} else if (strcmp(attr->name, "congestion_on") == 0) {
		spin_lock(&pd->lock);
		v = pd->write_congestion_on;
		spin_unlock(&pd->lock);
		n = sprintf(data, "%d\n", v);
	}
	return n;
}

static void init_write_congestion_marks(int* lo, int* hi)
{
	if (*hi > 0) {
		*hi = max(*hi, 500);
		*hi = min(*hi, 1000000);
		if (*lo <= 0)
			*lo = *hi - 100;
		else {
			*lo = min(*lo, *hi - 100);
			*lo = max(*lo, 100);
		}
	} else {
		*hi = -1;
		*lo = -1;
	}
}

static ssize_t kobj_pkt_store(struct kobject *kobj,
			struct attribute *attr,
			const char *data, size_t len)
{
	struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
	int val;

T
Thomas Maier 已提交
271
	if (strcmp(attr->name, "reset") == 0 && len > 0) {
272 273 274 275 276 277 278
		pd->stats.pkt_started = 0;
		pd->stats.pkt_ended = 0;
		pd->stats.secs_w = 0;
		pd->stats.secs_rg = 0;
		pd->stats.secs_r = 0;

	} else if (strcmp(attr->name, "congestion_off") == 0
T
Thomas Maier 已提交
279
		   && sscanf(data, "%d", &val) == 1) {
280 281 282 283 284 285 286
		spin_lock(&pd->lock);
		pd->write_congestion_off = val;
		init_write_congestion_marks(&pd->write_congestion_off,
					&pd->write_congestion_on);
		spin_unlock(&pd->lock);

	} else if (strcmp(attr->name, "congestion_on") == 0
T
Thomas Maier 已提交
287
		   && sscanf(data, "%d", &val) == 1) {
288 289 290 291 292 293 294 295 296
		spin_lock(&pd->lock);
		pd->write_congestion_on = val;
		init_write_congestion_marks(&pd->write_congestion_off,
					&pd->write_congestion_on);
		spin_unlock(&pd->lock);
	}
	return len;
}

297
static const struct sysfs_ops kobj_pkt_ops = {
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
	.show = kobj_pkt_show,
	.store = kobj_pkt_store
};
static struct kobj_type kobj_pkt_type_stat = {
	.release = pkt_kobj_release,
	.sysfs_ops = &kobj_pkt_ops,
	.default_attrs = kobj_pkt_attrs_stat
};
static struct kobj_type kobj_pkt_type_wqueue = {
	.release = pkt_kobj_release,
	.sysfs_ops = &kobj_pkt_ops,
	.default_attrs = kobj_pkt_attrs_wqueue
};

static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
{
	if (class_pktcdvd) {
315
		pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,
316
					"%s", pd->name);
317 318
		if (IS_ERR(pd->dev))
			pd->dev = NULL;
319
	}
320
	if (pd->dev) {
321
		pd->kobj_stat = pkt_kobj_create(pd, "stat",
322
					&pd->dev->kobj,
323 324
					&kobj_pkt_type_stat);
		pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
325
					&pd->dev->kobj,
326 327 328 329 330 331 332 333 334
					&kobj_pkt_type_wqueue);
	}
}

static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
{
	pkt_kobj_remove(pd->kobj_stat);
	pkt_kobj_remove(pd->kobj_wqueue);
	if (class_pktcdvd)
335
		device_unregister(pd->dev);
336 337 338 339 340 341 342 343 344 345 346 347 348 349
}


/********************************************************************
  /sys/class/pktcdvd/
                     add            map block device
                     remove         unmap packet dev
                     device_map     show mappings
 *******************************************************************/

static void class_pktcdvd_release(struct class *cls)
{
	kfree(cls);
}
350 351 352
static ssize_t class_pktcdvd_show_map(struct class *c,
					struct class_attribute *attr,
					char *data)
353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370
{
	int n = 0;
	int idx;
	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
	for (idx = 0; idx < MAX_WRITERS; idx++) {
		struct pktcdvd_device *pd = pkt_devs[idx];
		if (!pd)
			continue;
		n += sprintf(data+n, "%s %u:%u %u:%u\n",
			pd->name,
			MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
			MAJOR(pd->bdev->bd_dev),
			MINOR(pd->bdev->bd_dev));
	}
	mutex_unlock(&ctl_mutex);
	return n;
}

371 372 373
static ssize_t class_pktcdvd_store_add(struct class *c,
					struct class_attribute *attr,
					const char *buf,
374 375 376
					size_t count)
{
	unsigned int major, minor;
377

T
Thomas Maier 已提交
378
	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
379 380 381 382
		/* pkt_setup_dev() expects caller to hold reference to self */
		if (!try_module_get(THIS_MODULE))
			return -ENODEV;

383
		pkt_setup_dev(MKDEV(major, minor), NULL);
384 385 386

		module_put(THIS_MODULE);

387 388
		return count;
	}
389

390 391 392
	return -EINVAL;
}

393 394 395
static ssize_t class_pktcdvd_store_remove(struct class *c,
					  struct class_attribute *attr,
					  const char *buf,
396 397 398
					size_t count)
{
	unsigned int major, minor;
T
Thomas Maier 已提交
399
	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
		pkt_remove_dev(MKDEV(major, minor));
		return count;
	}
	return -EINVAL;
}

static struct class_attribute class_pktcdvd_attrs[] = {
 __ATTR(add,            0200, NULL, class_pktcdvd_store_add),
 __ATTR(remove,         0200, NULL, class_pktcdvd_store_remove),
 __ATTR(device_map,     0444, class_pktcdvd_show_map, NULL),
 __ATTR_NULL
};


static int pkt_sysfs_init(void)
{
	int ret = 0;

	/*
	 * create control files in sysfs
	 * /sys/class/pktcdvd/...
	 */
	class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
	if (!class_pktcdvd)
		return -ENOMEM;
	class_pktcdvd->name = DRIVER_NAME;
	class_pktcdvd->owner = THIS_MODULE;
	class_pktcdvd->class_release = class_pktcdvd_release;
	class_pktcdvd->class_attrs = class_pktcdvd_attrs;
	ret = class_register(class_pktcdvd);
	if (ret) {
		kfree(class_pktcdvd);
		class_pktcdvd = NULL;
433
		pr_err("failed to create class pktcdvd\n");
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
		return ret;
	}
	return 0;
}

static void pkt_sysfs_cleanup(void)
{
	if (class_pktcdvd)
		class_destroy(class_pktcdvd);
	class_pktcdvd = NULL;
}

/********************************************************************
  entries in debugfs

449
  /sys/kernel/debug/pktcdvd[0-7]/
450 451 452 453 454 455 456 457 458 459 460 461 462 463
			info

 *******************************************************************/

static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
{
	return pkt_seq_show(m, p);
}

static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
{
	return single_open(file, pkt_debugfs_seq_show, inode->i_private);
}

464
static const struct file_operations debug_fops = {
465 466 467 468 469 470 471 472 473 474 475 476
	.open		= pkt_debugfs_fops_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.owner		= THIS_MODULE,
};

static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
{
	if (!pkt_debugfs_root)
		return;
	pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
477
	if (!pd->dfs_d_root)
478
		return;
479

480 481 482 483 484 485 486 487
	pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
				pd->dfs_d_root, pd, &debug_fops);
}

static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
{
	if (!pkt_debugfs_root)
		return;
488 489
	debugfs_remove(pd->dfs_f_info);
	debugfs_remove(pd->dfs_d_root);
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506
	pd->dfs_f_info = NULL;
	pd->dfs_d_root = NULL;
}

static void pkt_debugfs_init(void)
{
	pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
}

static void pkt_debugfs_cleanup(void)
{
	debugfs_remove(pkt_debugfs_root);
	pkt_debugfs_root = NULL;
}

/* ----------------------------------------------------------*/

L
Linus Torvalds 已提交
507 508 509 510 511

static void pkt_bio_finished(struct pktcdvd_device *pd)
{
	BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
	if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
512
		pkt_dbg(2, pd, "queue empty\n");
L
Linus Torvalds 已提交
513 514 515 516 517 518 519 520
		atomic_set(&pd->iosched.attention, 1);
		wake_up(&pd->wqueue);
	}
}

/*
 * Allocate a packet_data struct
 */
521
static struct packet_data *pkt_alloc_packet_data(int frames)
L
Linus Torvalds 已提交
522 523 524 525
{
	int i;
	struct packet_data *pkt;

526
	pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
L
Linus Torvalds 已提交
527 528 529
	if (!pkt)
		goto no_pkt;

530
	pkt->frames = frames;
531
	pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
L
Linus Torvalds 已提交
532 533 534
	if (!pkt->w_bio)
		goto no_bio;

535
	for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
L
Linus Torvalds 已提交
536 537 538 539 540 541
		pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
		if (!pkt->pages[i])
			goto no_page;
	}

	spin_lock_init(&pkt->lock);
542
	bio_list_init(&pkt->orig_bios);
L
Linus Torvalds 已提交
543

544
	for (i = 0; i < frames; i++) {
545
		struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
L
Linus Torvalds 已提交
546 547
		if (!bio)
			goto no_rd_bio;
548

L
Linus Torvalds 已提交
549 550 551 552 553 554
		pkt->r_bios[i] = bio;
	}

	return pkt;

no_rd_bio:
555
	for (i = 0; i < frames; i++) {
L
Linus Torvalds 已提交
556 557 558 559 560 561
		struct bio *bio = pkt->r_bios[i];
		if (bio)
			bio_put(bio);
	}

no_page:
562
	for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
L
Linus Torvalds 已提交
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
		if (pkt->pages[i])
			__free_page(pkt->pages[i]);
	bio_put(pkt->w_bio);
no_bio:
	kfree(pkt);
no_pkt:
	return NULL;
}

/*
 * Free a packet_data struct
 */
static void pkt_free_packet_data(struct packet_data *pkt)
{
	int i;

579
	for (i = 0; i < pkt->frames; i++) {
L
Linus Torvalds 已提交
580 581 582 583
		struct bio *bio = pkt->r_bios[i];
		if (bio)
			bio_put(bio);
	}
584
	for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
L
Linus Torvalds 已提交
585 586 587 588 589 590 591 592 593 594 595 596 597 598
		__free_page(pkt->pages[i]);
	bio_put(pkt->w_bio);
	kfree(pkt);
}

static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *next;

	BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));

	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
		pkt_free_packet_data(pkt);
	}
599
	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
L
Linus Torvalds 已提交
600 601 602 603 604 605
}

static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
{
	struct packet_data *pkt;

606 607
	BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));

L
Linus Torvalds 已提交
608
	while (nr_packets > 0) {
609
		pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
L
Linus Torvalds 已提交
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
		if (!pkt) {
			pkt_shrink_pktlist(pd);
			return 0;
		}
		pkt->id = nr_packets;
		pkt->pd = pd;
		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
		nr_packets--;
	}
	return 1;
}

static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
{
	struct rb_node *n = rb_next(&node->rb_node);
	if (!n)
		return NULL;
	return rb_entry(n, struct pkt_rb_node, rb_node);
}

630
static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
L
Linus Torvalds 已提交
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
{
	rb_erase(&node->rb_node, &pd->bio_queue);
	mempool_free(node, pd->rb_pool);
	pd->bio_queue_size--;
	BUG_ON(pd->bio_queue_size < 0);
}

/*
 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
 */
static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
{
	struct rb_node *n = pd->bio_queue.rb_node;
	struct rb_node *next;
	struct pkt_rb_node *tmp;

	if (!n) {
		BUG_ON(pd->bio_queue_size > 0);
		return NULL;
	}

	for (;;) {
		tmp = rb_entry(n, struct pkt_rb_node, rb_node);
654
		if (s <= tmp->bio->bi_iter.bi_sector)
L
Linus Torvalds 已提交
655 656 657 658 659 660 661 662
			next = n->rb_left;
		else
			next = n->rb_right;
		if (!next)
			break;
		n = next;
	}

663
	if (s > tmp->bio->bi_iter.bi_sector) {
L
Linus Torvalds 已提交
664 665 666 667
		tmp = pkt_rbtree_next(tmp);
		if (!tmp)
			return NULL;
	}
668
	BUG_ON(s > tmp->bio->bi_iter.bi_sector);
L
Linus Torvalds 已提交
669 670 671 672 673 674 675 676 677 678
	return tmp;
}

/*
 * Insert a node into the pd->bio_queue rb tree.
 */
static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
{
	struct rb_node **p = &pd->bio_queue.rb_node;
	struct rb_node *parent = NULL;
679
	sector_t s = node->bio->bi_iter.bi_sector;
L
Linus Torvalds 已提交
680 681 682 683 684
	struct pkt_rb_node *tmp;

	while (*p) {
		parent = *p;
		tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
685
		if (s < tmp->bio->bi_iter.bi_sector)
L
Linus Torvalds 已提交
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}
	rb_link_node(&node->rb_node, parent, p);
	rb_insert_color(&node->rb_node, &pd->bio_queue);
	pd->bio_queue_size++;
}

/*
 * Send a packet_command to the underlying block device and
 * wait for completion.
 */
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
{
701
	struct request_queue *q = bdev_get_queue(pd->bdev);
L
Linus Torvalds 已提交
702
	struct request *rq;
703 704 705 706
	int ret = 0;

	rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
			     WRITE : READ, __GFP_WAIT);
J
Jens Axboe 已提交
707
	blk_rq_set_block_pc(rq);
708 709

	if (cgc->buflen) {
J
Julia Lawall 已提交
710 711 712
		ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
				      __GFP_WAIT);
		if (ret)
713 714
			goto out;
	}
L
Linus Torvalds 已提交
715

716
	rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
717
	memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
L
Linus Torvalds 已提交
718 719 720

	rq->timeout = 60*HZ;
	if (cgc->quiet)
721
		rq->cmd_flags |= REQ_QUIET;
L
Linus Torvalds 已提交
722

723
	blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
A
Andrew Morton 已提交
724 725
	if (rq->errors)
		ret = -EIO;
726
out:
L
Linus Torvalds 已提交
727
	blk_put_request(rq);
728
	return ret;
L
Linus Torvalds 已提交
729 730
}

731 732 733 734 735 736 737 738 739 740 741
static const char *sense_key_string(__u8 index)
{
	static const char * const info[] = {
		"No sense", "Recovered error", "Not ready",
		"Medium error", "Hardware error", "Illegal request",
		"Unit attention", "Data protect", "Blank check",
	};

	return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
}

L
Linus Torvalds 已提交
742 743 744 745
/*
 * A generic sense dump / resolve mechanism should be implemented across
 * all ATAPI + SCSI devices.
 */
746 747
static void pkt_dump_sense(struct pktcdvd_device *pd,
			   struct packet_command *cgc)
L
Linus Torvalds 已提交
748 749 750
{
	struct request_sense *sense = cgc->sense;

751
	if (sense)
752 753 754 755
		pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
			CDROM_PACKET_SIZE, cgc->cmd,
			sense->sense_key, sense->asc, sense->ascq,
			sense_key_string(sense->sense_key));
756
	else
757
		pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
L
Linus Torvalds 已提交
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
}

/*
 * flush the drive cache to media
 */
static int pkt_flush_cache(struct pktcdvd_device *pd)
{
	struct packet_command cgc;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
	cgc.quiet = 1;

	/*
	 * the IMMED bit -- we default to not setting it, although that
	 * would allow a much faster close, this is safer
	 */
#if 0
	cgc.cmd[1] = 1 << 1;
#endif
	return pkt_generic_packet(pd, &cgc);
}

/*
 * speed is given as the normal factor, e.g. 4 for 4x
 */
784 785
static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
				unsigned write_speed, unsigned read_speed)
L
Linus Torvalds 已提交
786 787 788 789 790 791 792 793 794 795 796 797 798 799
{
	struct packet_command cgc;
	struct request_sense sense;
	int ret;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_SET_SPEED;
	cgc.cmd[2] = (read_speed >> 8) & 0xff;
	cgc.cmd[3] = read_speed & 0xff;
	cgc.cmd[4] = (write_speed >> 8) & 0xff;
	cgc.cmd[5] = write_speed & 0xff;

	if ((ret = pkt_generic_packet(pd, &cgc)))
800
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
801 802 803 804 805 806 807 808

	return ret;
}

/*
 * Queue a bio for processing by the low-level CD device. Must be called
 * from process context.
 */
809
static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
L
Linus Torvalds 已提交
810 811
{
	spin_lock(&pd->iosched.lock);
812 813 814 815
	if (bio_data_dir(bio) == READ)
		bio_list_add(&pd->iosched.read_queue, bio);
	else
		bio_list_add(&pd->iosched.write_queue, bio);
L
Linus Torvalds 已提交
816 817 818 819 820 821 822 823 824 825 826
	spin_unlock(&pd->iosched.lock);

	atomic_set(&pd->iosched.attention, 1);
	wake_up(&pd->wqueue);
}

/*
 * Process the queued read/write requests. This function handles special
 * requirements for CDRW drives:
 * - A cache flush command must be inserted before a read request if the
 *   previous request was a write.
827
 * - Switching between reading and writing is slow, so don't do it more often
L
Linus Torvalds 已提交
828
 *   than necessary.
829 830 831 832
 * - Optimize for throughput at the expense of latency. This means that streaming
 *   writes will never be interrupted by a read, but if the drive has to seek
 *   before the next write, switch to reading instead if there are any pending
 *   read requests.
L
Linus Torvalds 已提交
833 834 835 836 837 838 839 840 841 842 843 844 845 846
 * - Set the read speed according to current usage pattern. When only reading
 *   from the device, it's best to use the highest possible read speed, but
 *   when switching often between reading and writing, it's better to have the
 *   same read and write speeds.
 */
static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
{

	if (atomic_read(&pd->iosched.attention) == 0)
		return;
	atomic_set(&pd->iosched.attention, 0);

	for (;;) {
		struct bio *bio;
847
		int reads_queued, writes_queued;
L
Linus Torvalds 已提交
848 849

		spin_lock(&pd->iosched.lock);
850 851
		reads_queued = !bio_list_empty(&pd->iosched.read_queue);
		writes_queued = !bio_list_empty(&pd->iosched.write_queue);
L
Linus Torvalds 已提交
852 853 854 855 856 857
		spin_unlock(&pd->iosched.lock);

		if (!reads_queued && !writes_queued)
			break;

		if (pd->iosched.writing) {
858 859
			int need_write_seek = 1;
			spin_lock(&pd->iosched.lock);
860
			bio = bio_list_peek(&pd->iosched.write_queue);
861
			spin_unlock(&pd->iosched.lock);
862 863
			if (bio && (bio->bi_iter.bi_sector ==
				    pd->iosched.last_write))
864 865
				need_write_seek = 0;
			if (need_write_seek && reads_queued) {
L
Linus Torvalds 已提交
866
				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
867
					pkt_dbg(2, pd, "write, waiting\n");
L
Linus Torvalds 已提交
868 869 870 871 872 873 874 875
					break;
				}
				pkt_flush_cache(pd);
				pd->iosched.writing = 0;
			}
		} else {
			if (!reads_queued && writes_queued) {
				if (atomic_read(&pd->cdrw.pending_bios) > 0) {
876
					pkt_dbg(2, pd, "read, waiting\n");
L
Linus Torvalds 已提交
877 878 879 880 881 882 883
					break;
				}
				pd->iosched.writing = 1;
			}
		}

		spin_lock(&pd->iosched.lock);
884 885 886 887
		if (pd->iosched.writing)
			bio = bio_list_pop(&pd->iosched.write_queue);
		else
			bio = bio_list_pop(&pd->iosched.read_queue);
L
Linus Torvalds 已提交
888 889 890 891 892 893
		spin_unlock(&pd->iosched.lock);

		if (!bio)
			continue;

		if (bio_data_dir(bio) == READ)
894 895
			pd->iosched.successive_reads +=
				bio->bi_iter.bi_size >> 10;
896
		else {
L
Linus Torvalds 已提交
897
			pd->iosched.successive_reads = 0;
K
Kent Overstreet 已提交
898
			pd->iosched.last_write = bio_end_sector(bio);
899
		}
L
Linus Torvalds 已提交
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
		if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
			if (pd->read_speed == pd->write_speed) {
				pd->read_speed = MAX_SPEED;
				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
			}
		} else {
			if (pd->read_speed != pd->write_speed) {
				pd->read_speed = pd->write_speed;
				pkt_set_speed(pd, pd->write_speed, pd->read_speed);
			}
		}

		atomic_inc(&pd->cdrw.pending_bios);
		generic_make_request(bio);
	}
}

/*
 * Special care is needed if the underlying block device has a small
 * max_phys_segments value.
 */
921
static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
L
Linus Torvalds 已提交
922
{
923
	if ((pd->settings.size << 9) / CD_FRAMESIZE
924
	    <= queue_max_segments(q)) {
L
Linus Torvalds 已提交
925 926 927 928 929
		/*
		 * The cdrom device can handle one segment/frame
		 */
		clear_bit(PACKET_MERGE_SEGS, &pd->flags);
		return 0;
930
	} else if ((pd->settings.size << 9) / PAGE_SIZE
931
		   <= queue_max_segments(q)) {
L
Linus Torvalds 已提交
932 933 934 935 936 937 938
		/*
		 * We can handle this case at the expense of some extra memory
		 * copies during write operations
		 */
		set_bit(PACKET_MERGE_SEGS, &pd->flags);
		return 0;
	} else {
939
		pkt_err(pd, "cdrom max_phys_segments too small\n");
L
Linus Torvalds 已提交
940 941 942 943 944 945 946 947 948 949 950
		return -EIO;
	}
}

/*
 * Copy all data for this packet to pkt->pages[], so that
 * a) The number of required segments for the write bio is minimized, which
 *    is necessary for some scsi controllers.
 * b) The data can be used as cache to avoid read requests if we receive a
 *    new write request for the same zone.
 */
951
static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
L
Linus Torvalds 已提交
952 953 954 955 956 957 958
{
	int f, p, offs;

	/* Copy all data to pkt->pages[] */
	p = 0;
	offs = 0;
	for (f = 0; f < pkt->frames; f++) {
959
		if (bvec[f].bv_page != pkt->pages[p]) {
960
			void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset;
L
Linus Torvalds 已提交
961 962
			void *vto = page_address(pkt->pages[p]) + offs;
			memcpy(vto, vfrom, CD_FRAMESIZE);
963
			kunmap_atomic(vfrom);
964 965
			bvec[f].bv_page = pkt->pages[p];
			bvec[f].bv_offset = offs;
L
Linus Torvalds 已提交
966
		} else {
967
			BUG_ON(bvec[f].bv_offset != offs);
L
Linus Torvalds 已提交
968 969 970 971 972 973 974 975 976
		}
		offs += CD_FRAMESIZE;
		if (offs >= PAGE_SIZE) {
			offs = 0;
			p++;
		}
	}
}

977
static void pkt_end_io_read(struct bio *bio, int err)
L
Linus Torvalds 已提交
978 979 980 981 982
{
	struct packet_data *pkt = bio->bi_private;
	struct pktcdvd_device *pd = pkt->pd;
	BUG_ON(!pd);

983
	pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
984
		bio, (unsigned long long)pkt->sector,
985
		(unsigned long long)bio->bi_iter.bi_sector, err);
L
Linus Torvalds 已提交
986 987 988 989 990 991 992 993 994 995

	if (err)
		atomic_inc(&pkt->io_errors);
	if (atomic_dec_and_test(&pkt->io_wait)) {
		atomic_inc(&pkt->run_sm);
		wake_up(&pd->wqueue);
	}
	pkt_bio_finished(pd);
}

996
static void pkt_end_io_packet_write(struct bio *bio, int err)
L
Linus Torvalds 已提交
997 998 999 1000 1001
{
	struct packet_data *pkt = bio->bi_private;
	struct pktcdvd_device *pd = pkt->pd;
	BUG_ON(!pd);

1002
	pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, err);
L
Linus Torvalds 已提交
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021

	pd->stats.pkt_ended++;

	pkt_bio_finished(pd);
	atomic_dec(&pkt->io_wait);
	atomic_inc(&pkt->run_sm);
	wake_up(&pd->wqueue);
}

/*
 * Schedule reads for the holes in a packet
 */
static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	int frames_read = 0;
	struct bio *bio;
	int f;
	char written[PACKET_MAX_SIZE];

1022
	BUG_ON(bio_list_empty(&pkt->orig_bios));
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027 1028 1029 1030 1031

	atomic_set(&pkt->io_wait, 0);
	atomic_set(&pkt->io_errors, 0);

	/*
	 * Figure out which frames we need to read before we can write.
	 */
	memset(written, 0, sizeof(written));
	spin_lock(&pkt->lock);
1032
	bio_list_for_each(bio, &pkt->orig_bios) {
1033 1034 1035
		int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
			(CD_FRAMESIZE >> 9);
		int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
1036
		pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
L
Linus Torvalds 已提交
1037 1038 1039 1040 1041 1042 1043
		BUG_ON(first_frame < 0);
		BUG_ON(first_frame + num_frames > pkt->frames);
		for (f = first_frame; f < first_frame + num_frames; f++)
			written[f] = 1;
	}
	spin_unlock(&pkt->lock);

1044
	if (pkt->cache_valid) {
1045
		pkt_dbg(2, pd, "zone %llx cached\n",
1046 1047 1048 1049
			(unsigned long long)pkt->sector);
		goto out_account;
	}

L
Linus Torvalds 已提交
1050 1051 1052 1053 1054
	/*
	 * Schedule reads for missing parts of the packet.
	 */
	for (f = 0; f < pkt->frames; f++) {
		int p, offset;
1055

L
Linus Torvalds 已提交
1056 1057
		if (written[f])
			continue;
1058

L
Linus Torvalds 已提交
1059
		bio = pkt->r_bios[f];
1060
		bio_reset(bio);
1061
		bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
L
Linus Torvalds 已提交
1062 1063 1064 1065 1066 1067
		bio->bi_bdev = pd->bdev;
		bio->bi_end_io = pkt_end_io_read;
		bio->bi_private = pkt;

		p = (f * CD_FRAMESIZE) / PAGE_SIZE;
		offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1068
		pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
L
Linus Torvalds 已提交
1069 1070 1071 1072 1073 1074
			f, pkt->pages[p], offset);
		if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
			BUG();

		atomic_inc(&pkt->io_wait);
		bio->bi_rw = READ;
1075
		pkt_queue_bio(pd, bio);
L
Linus Torvalds 已提交
1076 1077 1078 1079
		frames_read++;
	}

out_account:
1080
	pkt_dbg(2, pd, "need %d frames for zone %llx\n",
L
Linus Torvalds 已提交
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
		frames_read, (unsigned long long)pkt->sector);
	pd->stats.pkt_started++;
	pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
}

/*
 * Find a packet matching zone, or the least recently used packet if
 * there is no match.
 */
static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
{
	struct packet_data *pkt;

	list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
		if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
			list_del_init(&pkt->list);
			if (pkt->sector != zone)
				pkt->cache_valid = 0;
1099
			return pkt;
L
Linus Torvalds 已提交
1100 1101
		}
	}
1102 1103
	BUG();
	return NULL;
L
Linus Torvalds 已提交
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
}

static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	if (pkt->cache_valid) {
		list_add(&pkt->list, &pd->cdrw.pkt_free_list);
	} else {
		list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
	}
}

/*
 * recover a failed write, query for relocation if possible
 *
 * returns 1 if recovery is possible, or 0 if not
 *
 */
static int pkt_start_recovery(struct packet_data *pkt)
{
	/*
	 * FIXME. We need help from the file system to implement
	 * recovery handling.
	 */
	return 0;
#if 0
	struct request *rq = pkt->rq;
	struct pktcdvd_device *pd = rq->rq_disk->private_data;
	struct block_device *pkt_bdev;
	struct super_block *sb = NULL;
	unsigned long old_block, new_block;
	sector_t new_sector;

	pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
	if (pkt_bdev) {
		sb = get_super(pkt_bdev);
		bdput(pkt_bdev);
	}

	if (!sb)
		return 0;

1145
	if (!sb->s_op->relocate_blocks)
L
Linus Torvalds 已提交
1146 1147 1148 1149 1150 1151 1152 1153 1154
		goto out;

	old_block = pkt->sector / (CD_FRAMESIZE >> 9);
	if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
		goto out;

	new_sector = new_block * (CD_FRAMESIZE >> 9);
	pkt->sector = new_sector;

1155 1156 1157
	bio_reset(pkt->bio);
	pkt->bio->bi_bdev = pd->bdev;
	pkt->bio->bi_rw = REQ_WRITE;
1158 1159
	pkt->bio->bi_iter.bi_sector = new_sector;
	pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;
1160
	pkt->bio->bi_vcnt = pkt->frames;
L
Linus Torvalds 已提交
1161

1162 1163
	pkt->bio->bi_end_io = pkt_end_io_packet_write;
	pkt->bio->bi_private = pkt;
L
Linus Torvalds 已提交
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180

	drop_super(sb);
	return 1;

out:
	drop_super(sb);
	return 0;
#endif
}

static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
{
#if PACKET_DEBUG > 1
	static const char *state_name[] = {
		"IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
	};
	enum packet_data_state old_state = pkt->state;
1181
	pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
1182
		pkt->id, (unsigned long long)pkt->sector,
L
Linus Torvalds 已提交
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
		state_name[old_state], state_name[state]);
#endif
	pkt->state = state;
}

/*
 * Scan the work queue to see if we can start a new packet.
 * returns non-zero if any work was done.
 */
static int pkt_handle_queue(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *p;
	struct bio *bio = NULL;
	sector_t zone = 0; /* Suppress gcc warning */
	struct pkt_rb_node *node, *first_node;
	struct rb_node *n;
1199
	int wakeup;
L
Linus Torvalds 已提交
1200 1201 1202 1203

	atomic_set(&pd->scan_queue, 0);

	if (list_empty(&pd->cdrw.pkt_free_list)) {
1204
		pkt_dbg(2, pd, "no pkt\n");
L
Linus Torvalds 已提交
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
		return 0;
	}

	/*
	 * Try to find a zone we are not already working on.
	 */
	spin_lock(&pd->lock);
	first_node = pkt_rbtree_find(pd, pd->current_sector);
	if (!first_node) {
		n = rb_first(&pd->bio_queue);
		if (n)
			first_node = rb_entry(n, struct pkt_rb_node, rb_node);
	}
	node = first_node;
	while (node) {
		bio = node->bio;
1221
		zone = get_zone(bio->bi_iter.bi_sector, pd);
L
Linus Torvalds 已提交
1222
		list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1223 1224
			if (p->sector == zone) {
				bio = NULL;
L
Linus Torvalds 已提交
1225
				goto try_next_bio;
1226
			}
L
Linus Torvalds 已提交
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
		}
		break;
try_next_bio:
		node = pkt_rbtree_next(node);
		if (!node) {
			n = rb_first(&pd->bio_queue);
			if (n)
				node = rb_entry(n, struct pkt_rb_node, rb_node);
		}
		if (node == first_node)
			node = NULL;
	}
	spin_unlock(&pd->lock);
	if (!bio) {
1241
		pkt_dbg(2, pd, "no bio\n");
L
Linus Torvalds 已提交
1242 1243 1244 1245 1246 1247 1248
		return 0;
	}

	pkt = pkt_get_packet_data(pd, zone);

	pd->current_sector = zone + pd->settings.size;
	pkt->sector = zone;
1249
	BUG_ON(pkt->frames != pd->settings.size >> 2);
L
Linus Torvalds 已提交
1250 1251 1252 1253 1254 1255 1256
	pkt->write_size = 0;

	/*
	 * Scan work queue for bios in the same zone and link them
	 * to this packet.
	 */
	spin_lock(&pd->lock);
1257
	pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
L
Linus Torvalds 已提交
1258 1259
	while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
		bio = node->bio;
1260 1261 1262
		pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
			get_zone(bio->bi_iter.bi_sector, pd));
		if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
L
Linus Torvalds 已提交
1263 1264 1265
			break;
		pkt_rbtree_erase(pd, node);
		spin_lock(&pkt->lock);
1266
		bio_list_add(&pkt->orig_bios, bio);
1267
		pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
L
Linus Torvalds 已提交
1268 1269
		spin_unlock(&pkt->lock);
	}
1270 1271 1272 1273
	/* check write congestion marks, and if bio_queue_size is
	   below, wake up any waiters */
	wakeup = (pd->write_congestion_on > 0
	 		&& pd->bio_queue_size <= pd->write_congestion_off);
L
Linus Torvalds 已提交
1274
	spin_unlock(&pd->lock);
1275 1276 1277 1278
	if (wakeup) {
		clear_bdi_congested(&pd->disk->queue->backing_dev_info,
					BLK_RW_ASYNC);
	}
L
Linus Torvalds 已提交
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297

	pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
	pkt_set_state(pkt, PACKET_WAITING_STATE);
	atomic_set(&pkt->run_sm, 1);

	spin_lock(&pd->cdrw.active_list_lock);
	list_add(&pkt->list, &pd->cdrw.pkt_active_list);
	spin_unlock(&pd->cdrw.active_list_lock);

	return 1;
}

/*
 * Assemble a bio to write one packet and queue the bio for processing
 * by the underlying block device.
 */
static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	int f;
1298
	struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
L
Linus Torvalds 已提交
1299

K
Kent Overstreet 已提交
1300
	bio_reset(pkt->w_bio);
1301
	pkt->w_bio->bi_iter.bi_sector = pkt->sector;
K
Kent Overstreet 已提交
1302 1303 1304 1305 1306
	pkt->w_bio->bi_bdev = pd->bdev;
	pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
	pkt->w_bio->bi_private = pkt;

	/* XXX: locking? */
L
Linus Torvalds 已提交
1307
	for (f = 0; f < pkt->frames; f++) {
1308 1309
		bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
		bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
K
Kent Overstreet 已提交
1310 1311
		if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
			BUG();
L
Linus Torvalds 已提交
1312
	}
1313
	pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
L
Linus Torvalds 已提交
1314 1315

	/*
1316
	 * Fill-in bvec with data from orig_bios.
L
Linus Torvalds 已提交
1317 1318
	 */
	spin_lock(&pkt->lock);
K
Kent Overstreet 已提交
1319
	bio_copy_data(pkt->w_bio, pkt->orig_bios.head);
L
Linus Torvalds 已提交
1320 1321 1322 1323

	pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
	spin_unlock(&pkt->lock);

1324
	pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
K
Kent Overstreet 已提交
1325
		pkt->write_size, (unsigned long long)pkt->sector);
L
Linus Torvalds 已提交
1326 1327

	if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1328
		pkt_make_local_copy(pkt, bvec);
L
Linus Torvalds 已提交
1329 1330 1331 1332 1333 1334 1335 1336
		pkt->cache_valid = 1;
	} else {
		pkt->cache_valid = 0;
	}

	/* Start the write request */
	atomic_set(&pkt->io_wait, 1);
	pkt->w_bio->bi_rw = WRITE;
1337
	pkt_queue_bio(pd, pkt->w_bio);
L
Linus Torvalds 已提交
1338 1339 1340 1341
}

static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
{
1342
	struct bio *bio;
L
Linus Torvalds 已提交
1343 1344 1345 1346 1347

	if (!uptodate)
		pkt->cache_valid = 0;

	/* Finish all bios corresponding to this packet */
1348
	while ((bio = bio_list_pop(&pkt->orig_bios)))
1349
		bio_endio(bio, uptodate ? 0 : -EIO);
L
Linus Torvalds 已提交
1350 1351 1352 1353 1354 1355
}

static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
{
	int uptodate;

1356
	pkt_dbg(2, pd, "pkt %d\n", pkt->id);
L
Linus Torvalds 已提交
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394

	for (;;) {
		switch (pkt->state) {
		case PACKET_WAITING_STATE:
			if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
				return;

			pkt->sleep_time = 0;
			pkt_gather_data(pd, pkt);
			pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
			break;

		case PACKET_READ_WAIT_STATE:
			if (atomic_read(&pkt->io_wait) > 0)
				return;

			if (atomic_read(&pkt->io_errors) > 0) {
				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
			} else {
				pkt_start_write(pd, pkt);
			}
			break;

		case PACKET_WRITE_WAIT_STATE:
			if (atomic_read(&pkt->io_wait) > 0)
				return;

			if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
				pkt_set_state(pkt, PACKET_FINISHED_STATE);
			} else {
				pkt_set_state(pkt, PACKET_RECOVERY_STATE);
			}
			break;

		case PACKET_RECOVERY_STATE:
			if (pkt_start_recovery(pkt)) {
				pkt_start_write(pd, pkt);
			} else {
1395
				pkt_dbg(2, pd, "No recovery possible\n");
L
Linus Torvalds 已提交
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
				pkt_set_state(pkt, PACKET_FINISHED_STATE);
			}
			break;

		case PACKET_FINISHED_STATE:
			uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
			pkt_finish_packet(pkt, uptodate);
			return;

		default:
			BUG();
			break;
		}
	}
}

static void pkt_handle_packets(struct pktcdvd_device *pd)
{
	struct packet_data *pkt, *next;

	/*
	 * Run state machine for active packets
	 */
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		if (atomic_read(&pkt->run_sm) > 0) {
			atomic_set(&pkt->run_sm, 0);
			pkt_run_state_machine(pd, pkt);
		}
	}

	/*
	 * Move no longer active packets to the free list
	 */
	spin_lock(&pd->cdrw.active_list_lock);
	list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
		if (pkt->state == PACKET_FINISHED_STATE) {
			list_del(&pkt->list);
			pkt_put_packet_data(pd, pkt);
			pkt_set_state(pkt, PACKET_IDLE_STATE);
			atomic_set(&pd->scan_queue, 1);
		}
	}
	spin_unlock(&pd->cdrw.active_list_lock);
}

static void pkt_count_states(struct pktcdvd_device *pd, int *states)
{
	struct packet_data *pkt;
	int i;

P
Peter Osterlund 已提交
1446
	for (i = 0; i < PACKET_NUM_STATES; i++)
L
Linus Torvalds 已提交
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
		states[i] = 0;

	spin_lock(&pd->cdrw.active_list_lock);
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		states[pkt->state]++;
	}
	spin_unlock(&pd->cdrw.active_list_lock);
}

/*
 * kcdrwd is woken up when writes have been queued for one of our
 * registered devices
 */
static int kcdrwd(void *foobar)
{
	struct pktcdvd_device *pd = foobar;
	struct packet_data *pkt;
	long min_sleep_time, residue;

1466
	set_user_nice(current, MIN_NICE);
1467
	set_freezable();
L
Linus Torvalds 已提交
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496

	for (;;) {
		DECLARE_WAITQUEUE(wait, current);

		/*
		 * Wait until there is something to do
		 */
		add_wait_queue(&pd->wqueue, &wait);
		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);

			/* Check if we need to run pkt_handle_queue */
			if (atomic_read(&pd->scan_queue) > 0)
				goto work_to_do;

			/* Check if we need to run the state machine for some packet */
			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (atomic_read(&pkt->run_sm) > 0)
					goto work_to_do;
			}

			/* Check if we need to process the iosched queues */
			if (atomic_read(&pd->iosched.attention) != 0)
				goto work_to_do;

			/* Otherwise, go to sleep */
			if (PACKET_DEBUG > 1) {
				int states[PACKET_NUM_STATES];
				pkt_count_states(pd, states);
1497
				pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1498 1499
					states[0], states[1], states[2],
					states[3], states[4], states[5]);
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504 1505 1506 1507
			}

			min_sleep_time = MAX_SCHEDULE_TIMEOUT;
			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
					min_sleep_time = pkt->sleep_time;
			}

1508
			pkt_dbg(2, pd, "sleeping\n");
L
Linus Torvalds 已提交
1509
			residue = schedule_timeout(min_sleep_time);
1510
			pkt_dbg(2, pd, "wake up\n");
L
Linus Torvalds 已提交
1511 1512

			/* make swsusp happy with our thread */
1513
			try_to_freeze();
L
Linus Torvalds 已提交
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557

			list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
				if (!pkt->sleep_time)
					continue;
				pkt->sleep_time -= min_sleep_time - residue;
				if (pkt->sleep_time <= 0) {
					pkt->sleep_time = 0;
					atomic_inc(&pkt->run_sm);
				}
			}

			if (kthread_should_stop())
				break;
		}
work_to_do:
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&pd->wqueue, &wait);

		if (kthread_should_stop())
			break;

		/*
		 * if pkt_handle_queue returns true, we can queue
		 * another request.
		 */
		while (pkt_handle_queue(pd))
			;

		/*
		 * Handle packet state machine
		 */
		pkt_handle_packets(pd);

		/*
		 * Handle iosched queues
		 */
		pkt_iosched_process_queue(pd);
	}

	return 0;
}

static void pkt_print_settings(struct pktcdvd_device *pd)
{
1558 1559 1560 1561
	pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
		 pd->settings.fp ? "Fixed" : "Variable",
		 pd->settings.size >> 2,
		 pd->settings.block_mode == 8 ? '1' : '2');
L
Linus Torvalds 已提交
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
}

static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
{
	memset(cgc->cmd, 0, sizeof(cgc->cmd));

	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
	cgc->cmd[2] = page_code | (page_control << 6);
	cgc->cmd[7] = cgc->buflen >> 8;
	cgc->cmd[8] = cgc->buflen & 0xff;
	cgc->data_direction = CGC_DATA_READ;
	return pkt_generic_packet(pd, cgc);
}

static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
{
	memset(cgc->cmd, 0, sizeof(cgc->cmd));
	memset(cgc->buffer, 0, 2);
	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
	cgc->cmd[1] = 0x10;		/* PF */
	cgc->cmd[7] = cgc->buflen >> 8;
	cgc->cmd[8] = cgc->buflen & 0xff;
	cgc->data_direction = CGC_DATA_WRITE;
	return pkt_generic_packet(pd, cgc);
}

static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
{
	struct packet_command cgc;
	int ret;

	/* set up command and get the disc info */
	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
	cgc.cmd[8] = cgc.buflen = 2;
	cgc.quiet = 1;

	if ((ret = pkt_generic_packet(pd, &cgc)))
		return ret;

	/* not all drives have the same disc_info length, so requeue
	 * packet with the length the drive tells us it can supply
	 */
	cgc.buflen = be16_to_cpu(di->disc_information_length) +
		     sizeof(di->disc_information_length);

	if (cgc.buflen > sizeof(disc_information))
		cgc.buflen = sizeof(disc_information);

	cgc.cmd[8] = cgc.buflen;
	return pkt_generic_packet(pd, &cgc);
}

static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
{
	struct packet_command cgc;
	int ret;

	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
	cgc.cmd[1] = type & 3;
	cgc.cmd[4] = (track & 0xff00) >> 8;
	cgc.cmd[5] = track & 0xff;
	cgc.cmd[8] = 8;
	cgc.quiet = 1;

	if ((ret = pkt_generic_packet(pd, &cgc)))
		return ret;

	cgc.buflen = be16_to_cpu(ti->track_information_length) +
		     sizeof(ti->track_information_length);

	if (cgc.buflen > sizeof(track_information))
		cgc.buflen = sizeof(track_information);

	cgc.cmd[8] = cgc.buflen;
	return pkt_generic_packet(pd, &cgc);
}

1641 1642
static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
						long *last_written)
L
Linus Torvalds 已提交
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
{
	disc_information di;
	track_information ti;
	__u32 last_track;
	int ret = -1;

	if ((ret = pkt_get_disc_info(pd, &di)))
		return ret;

	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
	if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
		return ret;

	/* if this track is blank, try the previous. */
	if (ti.blank) {
		last_track--;
		if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
			return ret;
	}

	/* if last recorded field is valid, return it. */
	if (ti.lra_v) {
		*last_written = be32_to_cpu(ti.last_rec_address);
	} else {
		/* make it up instead */
		*last_written = be32_to_cpu(ti.track_start) +
				be32_to_cpu(ti.track_size);
		if (ti.free_blocks)
			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
	}
	return 0;
}

/*
 * write mode select package based on pd->settings
 */
1679
static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
L
Linus Torvalds 已提交
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
{
	struct packet_command cgc;
	struct request_sense sense;
	write_param_page *wp;
	char buffer[128];
	int ret, size;

	/* doesn't apply to DVD+RW or DVD-RAM */
	if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
		return 0;

	memset(buffer, 0, sizeof(buffer));
	init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
	cgc.sense = &sense;
	if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1695
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
		return ret;
	}

	size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
	pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
	if (size > sizeof(buffer))
		size = sizeof(buffer);

	/*
	 * now get it all
	 */
	init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
	cgc.sense = &sense;
	if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1710
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
		return ret;
	}

	/*
	 * write page is offset header + block descriptor length
	 */
	wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];

	wp->fp = pd->settings.fp;
	wp->track_mode = pd->settings.track_mode;
	wp->write_type = pd->settings.write_type;
	wp->data_block_type = pd->settings.block_mode;

	wp->multi_session = 0;

#ifdef PACKET_USE_LS
	wp->link_size = 7;
	wp->ls_v = 1;
#endif

	if (wp->data_block_type == PACKET_BLOCK_MODE1) {
		wp->session_format = 0;
		wp->subhdr2 = 0x20;
	} else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
		wp->session_format = 0x20;
		wp->subhdr2 = 8;
#if 0
		wp->mcn[0] = 0x80;
		memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
#endif
	} else {
		/*
		 * paranoia
		 */
1745
		pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
L
Linus Torvalds 已提交
1746 1747 1748 1749 1750 1751
		return 1;
	}
	wp->packet_size = cpu_to_be32(pd->settings.size >> 2);

	cgc.buflen = cgc.cmd[8] = size;
	if ((ret = pkt_mode_select(pd, &cgc))) {
1752
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
1753 1754 1755 1756 1757 1758 1759 1760
		return ret;
	}

	pkt_print_settings(pd);
	return 0;
}

/*
1761
 * 1 -- we can write to this track, 0 -- we can't
L
Linus Torvalds 已提交
1762
 */
1763
static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
L
Linus Torvalds 已提交
1764
{
1765 1766 1767 1768 1769 1770 1771 1772
	switch (pd->mmc3_profile) {
		case 0x1a: /* DVD+RW */
		case 0x12: /* DVD-RAM */
			/* The track is always writable on DVD+RW/DVD-RAM */
			return 1;
		default:
			break;
	}
L
Linus Torvalds 已提交
1773

1774 1775
	if (!ti->packet || !ti->fp)
		return 0;
L
Linus Torvalds 已提交
1776 1777 1778 1779

	/*
	 * "good" settings as per Mt Fuji.
	 */
1780
	if (ti->rt == 0 && ti->blank == 0)
1781
		return 1;
L
Linus Torvalds 已提交
1782

1783
	if (ti->rt == 0 && ti->blank == 1)
1784
		return 1;
L
Linus Torvalds 已提交
1785

1786
	if (ti->rt == 1 && ti->blank == 0)
1787
		return 1;
L
Linus Torvalds 已提交
1788

1789
	pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1790
	return 0;
L
Linus Torvalds 已提交
1791 1792 1793
}

/*
1794
 * 1 -- we can write to this disc, 0 -- we can't
L
Linus Torvalds 已提交
1795
 */
1796
static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
L
Linus Torvalds 已提交
1797 1798 1799 1800 1801 1802 1803 1804
{
	switch (pd->mmc3_profile) {
		case 0x0a: /* CD-RW */
		case 0xffff: /* MMC3 not supported */
			break;
		case 0x1a: /* DVD+RW */
		case 0x13: /* DVD-RW */
		case 0x12: /* DVD-RAM */
1805
			return 1;
L
Linus Torvalds 已提交
1806
		default:
1807
			pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
1808
				pd->mmc3_profile);
1809
			return 0;
L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815 1816
	}

	/*
	 * for disc type 0xff we should probably reserve a new track.
	 * but i'm not sure, should we leave this to user apps? probably.
	 */
	if (di->disc_type == 0xff) {
1817
		pkt_notice(pd, "unknown disc - no track?\n");
1818
		return 0;
L
Linus Torvalds 已提交
1819 1820 1821
	}

	if (di->disc_type != 0x20 && di->disc_type != 0) {
1822
		pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
1823
		return 0;
L
Linus Torvalds 已提交
1824 1825 1826
	}

	if (di->erasable == 0) {
1827
		pkt_notice(pd, "disc not erasable\n");
1828
		return 0;
L
Linus Torvalds 已提交
1829 1830 1831
	}

	if (di->border_status == PACKET_SESSION_RESERVED) {
1832
		pkt_err(pd, "can't write to last track (reserved)\n");
1833
		return 0;
L
Linus Torvalds 已提交
1834 1835
	}

1836
	return 1;
L
Linus Torvalds 已提交
1837 1838
}

1839
static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
L
Linus Torvalds 已提交
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
{
	struct packet_command cgc;
	unsigned char buf[12];
	disc_information di;
	track_information ti;
	int ret, track;

	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
	cgc.cmd[8] = 8;
	ret = pkt_generic_packet(pd, &cgc);
	pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];

	memset(&di, 0, sizeof(disc_information));
	memset(&ti, 0, sizeof(track_information));

	if ((ret = pkt_get_disc_info(pd, &di))) {
1857
		pkt_err(pd, "failed get_disc\n");
L
Linus Torvalds 已提交
1858 1859 1860
		return ret;
	}

1861
	if (!pkt_writable_disc(pd, &di))
1862
		return -EROFS;
L
Linus Torvalds 已提交
1863 1864 1865 1866 1867

	pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;

	track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
	if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1868
		pkt_err(pd, "failed get_track\n");
L
Linus Torvalds 已提交
1869 1870 1871
		return ret;
	}

1872
	if (!pkt_writable_track(pd, &ti)) {
1873
		pkt_err(pd, "can't write to this track\n");
1874
		return -EROFS;
L
Linus Torvalds 已提交
1875 1876 1877 1878 1879 1880 1881 1882
	}

	/*
	 * we keep packet size in 512 byte units, makes it easier to
	 * deal with request calculations.
	 */
	pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
	if (pd->settings.size == 0) {
1883
		pkt_notice(pd, "detected zero packet size!\n");
1884
		return -ENXIO;
L
Linus Torvalds 已提交
1885
	}
1886
	if (pd->settings.size > PACKET_MAX_SECTORS) {
1887
		pkt_err(pd, "packet size is too big\n");
1888
		return -EROFS;
1889
	}
L
Linus Torvalds 已提交
1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
	pd->settings.fp = ti.fp;
	pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);

	if (ti.nwa_v) {
		pd->nwa = be32_to_cpu(ti.next_writable);
		set_bit(PACKET_NWA_VALID, &pd->flags);
	}

	/*
	 * in theory we could use lra on -RW media as well and just zero
	 * blocks that haven't been written yet, but in practice that
	 * is just a no-go. we'll use that for -R, naturally.
	 */
	if (ti.lra_v) {
		pd->lra = be32_to_cpu(ti.last_rec_address);
		set_bit(PACKET_LRA_VALID, &pd->flags);
	} else {
		pd->lra = 0xffffffff;
		set_bit(PACKET_LRA_VALID, &pd->flags);
	}

	/*
	 * fine for now
	 */
	pd->settings.link_loss = 7;
	pd->settings.write_type = 0;	/* packet */
	pd->settings.track_mode = ti.track_mode;

	/*
	 * mode1 or mode2 disc
	 */
	switch (ti.data_mode) {
		case PACKET_MODE1:
			pd->settings.block_mode = PACKET_BLOCK_MODE1;
			break;
		case PACKET_MODE2:
			pd->settings.block_mode = PACKET_BLOCK_MODE2;
			break;
		default:
1929
			pkt_err(pd, "unknown data mode\n");
1930
			return -EROFS;
L
Linus Torvalds 已提交
1931 1932 1933 1934 1935 1936 1937
	}
	return 0;
}

/*
 * enable/disable write caching on drive
 */
1938 1939
static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
						int set)
L
Linus Torvalds 已提交
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[64];
	int ret;

	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.buflen = pd->mode_offset + 12;

	/*
	 * caching mode page might not be there, so quiet this command
	 */
	cgc.quiet = 1;

	if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
		return ret;

	buf[pd->mode_offset + 10] |= (!!set << 2);

	cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
	ret = pkt_mode_select(pd, &cgc);
	if (ret) {
1963
		pkt_err(pd, "write caching control failed\n");
1964
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
1965
	} else if (!ret && set)
1966
		pkt_notice(pd, "enabled write caching\n");
L
Linus Torvalds 已提交
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
	return ret;
}

static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
{
	struct packet_command cgc;

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
	cgc.cmd[4] = lockflag ? 1 : 0;
	return pkt_generic_packet(pd, &cgc);
}

/*
 * Returns drive maximum write speed
 */
1983 1984
static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
						unsigned *write_speed)
L
Linus Torvalds 已提交
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[256+18];
	unsigned char *cap_buf;
	int ret, offset;

	cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
	cgc.sense = &sense;

	ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
	if (ret) {
		cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
			     sizeof(struct mode_page_header);
		ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
		if (ret) {
2002
			pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
			return ret;
		}
	}

	offset = 20;			    /* Obsoleted field, used by older drives */
	if (cap_buf[1] >= 28)
		offset = 28;		    /* Current write speed selected */
	if (cap_buf[1] >= 30) {
		/* If the drive reports at least one "Logical Unit Write
		 * Speed Performance Descriptor Block", use the information
		 * in the first block. (contains the highest speed)
		 */
		int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
		if (num_spdb > 0)
			offset = 34;
	}

	*write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
	return 0;
}

/* These tables from cdrecord - I don't have orange book */
/* standard speed CD-RW (1-4x) */
static char clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* high speed CD-RW (-10x) */
static char hs_clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* ultra high speed CD-RW */
static char us_clv_to_speed[16] = {
	/* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
	   0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
};

/*
 * reads the maximum media speed from ATIP
 */
2044 2045
static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
						unsigned *speed)
L
Linus Torvalds 已提交
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
{
	struct packet_command cgc;
	struct request_sense sense;
	unsigned char buf[64];
	unsigned int size, st, sp;
	int ret;

	init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	cgc.cmd[1] = 2;
	cgc.cmd[2] = 4; /* READ ATIP */
	cgc.cmd[8] = 2;
	ret = pkt_generic_packet(pd, &cgc);
	if (ret) {
2061
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
		return ret;
	}
	size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
	if (size > sizeof(buf))
		size = sizeof(buf);

	init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
	cgc.sense = &sense;
	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	cgc.cmd[1] = 2;
	cgc.cmd[2] = 4;
	cgc.cmd[8] = size;
	ret = pkt_generic_packet(pd, &cgc);
	if (ret) {
2076
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
2077 2078 2079
		return ret;
	}

2080
	if (!(buf[6] & 0x40)) {
2081
		pkt_notice(pd, "disc type is not CD-RW\n");
L
Linus Torvalds 已提交
2082 2083
		return 1;
	}
2084
	if (!(buf[6] & 0x4)) {
2085
		pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
L
Linus Torvalds 已提交
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
		return 1;
	}

	st = (buf[6] >> 3) & 0x7; /* disc sub-type */

	sp = buf[16] & 0xf; /* max speed from ATIP A1 field */

	/* Info from cdrecord */
	switch (st) {
		case 0: /* standard speed */
			*speed = clv_to_speed[sp];
			break;
		case 1: /* high speed */
			*speed = hs_clv_to_speed[sp];
			break;
		case 2: /* ultra high speed */
			*speed = us_clv_to_speed[sp];
			break;
		default:
2105
			pkt_notice(pd, "unknown disc sub-type %d\n", st);
L
Linus Torvalds 已提交
2106 2107 2108
			return 1;
	}
	if (*speed) {
2109
		pkt_info(pd, "maximum media speed: %d\n", *speed);
L
Linus Torvalds 已提交
2110 2111
		return 0;
	} else {
2112
		pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
L
Linus Torvalds 已提交
2113 2114 2115 2116
		return 1;
	}
}

2117
static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
L
Linus Torvalds 已提交
2118 2119 2120 2121 2122
{
	struct packet_command cgc;
	struct request_sense sense;
	int ret;

2123
	pkt_dbg(2, pd, "Performing OPC\n");
L
Linus Torvalds 已提交
2124 2125 2126 2127 2128 2129 2130

	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
	cgc.sense = &sense;
	cgc.timeout = 60*HZ;
	cgc.cmd[0] = GPCMD_SEND_OPC;
	cgc.cmd[1] = 1;
	if ((ret = pkt_generic_packet(pd, &cgc)))
2131
		pkt_dump_sense(pd, &cgc);
L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137 2138 2139 2140
	return ret;
}

static int pkt_open_write(struct pktcdvd_device *pd)
{
	int ret;
	unsigned int write_speed, media_write_speed, read_speed;

	if ((ret = pkt_probe_settings(pd))) {
2141
		pkt_dbg(2, pd, "failed probe\n");
2142
		return ret;
L
Linus Torvalds 已提交
2143 2144 2145
	}

	if ((ret = pkt_set_write_settings(pd))) {
2146
		pkt_dbg(1, pd, "failed saving write settings\n");
L
Linus Torvalds 已提交
2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157
		return -EIO;
	}

	pkt_write_caching(pd, USE_WCACHING);

	if ((ret = pkt_get_max_speed(pd, &write_speed)))
		write_speed = 16 * 177;
	switch (pd->mmc3_profile) {
		case 0x13: /* DVD-RW */
		case 0x1a: /* DVD+RW */
		case 0x12: /* DVD-RAM */
2158
			pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
L
Linus Torvalds 已提交
2159 2160 2161 2162 2163
			break;
		default:
			if ((ret = pkt_media_speed(pd, &media_write_speed)))
				media_write_speed = 16;
			write_speed = min(write_speed, media_write_speed * 177);
2164
			pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
L
Linus Torvalds 已提交
2165 2166 2167 2168 2169
			break;
	}
	read_speed = write_speed;

	if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
2170
		pkt_dbg(1, pd, "couldn't set write speed\n");
L
Linus Torvalds 已提交
2171 2172 2173 2174 2175 2176
		return -EIO;
	}
	pd->write_speed = write_speed;
	pd->read_speed = read_speed;

	if ((ret = pkt_perform_opc(pd))) {
2177
		pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
L
Linus Torvalds 已提交
2178 2179 2180 2181 2182 2183 2184 2185
	}

	return 0;
}

/*
 * called at open time.
 */
2186
static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
L
Linus Torvalds 已提交
2187 2188 2189
{
	int ret;
	long lba;
2190
	struct request_queue *q;
L
Linus Torvalds 已提交
2191 2192 2193 2194 2195 2196 2197

	/*
	 * We need to re-open the cdrom device without O_NONBLOCK to be able
	 * to read/write from/to it. It is already opened in O_NONBLOCK mode
	 * so bdget() can't fail.
	 */
	bdget(pd->bdev->bd_dev);
2198
	if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd)))
L
Linus Torvalds 已提交
2199 2200 2201
		goto out;

	if ((ret = pkt_get_last_written(pd, &lba))) {
2202
		pkt_err(pd, "pkt_get_last_written failed\n");
2203
		goto out_putdev;
L
Linus Torvalds 已提交
2204 2205 2206 2207 2208 2209 2210 2211 2212
	}

	set_capacity(pd->disk, lba << 2);
	set_capacity(pd->bdev->bd_disk, lba << 2);
	bd_set_size(pd->bdev, (loff_t)lba << 11);

	q = bdev_get_queue(pd->bdev);
	if (write) {
		if ((ret = pkt_open_write(pd)))
2213
			goto out_putdev;
L
Linus Torvalds 已提交
2214 2215 2216 2217 2218
		/*
		 * Some CDRW drives can not handle writes larger than one packet,
		 * even if the size is a multiple of the packet size.
		 */
		spin_lock_irq(q->queue_lock);
2219
		blk_queue_max_hw_sectors(q, pd->settings.size);
L
Linus Torvalds 已提交
2220 2221 2222 2223 2224 2225 2226 2227
		spin_unlock_irq(q->queue_lock);
		set_bit(PACKET_WRITABLE, &pd->flags);
	} else {
		pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
		clear_bit(PACKET_WRITABLE, &pd->flags);
	}

	if ((ret = pkt_set_segment_merging(pd, q)))
2228
		goto out_putdev;
L
Linus Torvalds 已提交
2229

2230 2231
	if (write) {
		if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2232
			pkt_err(pd, "not enough memory for buffers\n");
2233
			ret = -ENOMEM;
2234
			goto out_putdev;
2235
		}
2236
		pkt_info(pd, "%lukB available on disc\n", lba << 1);
2237
	}
L
Linus Torvalds 已提交
2238 2239 2240 2241

	return 0;

out_putdev:
2242
	blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
L
Linus Torvalds 已提交
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
out:
	return ret;
}

/*
 * called when the device is closed. makes sure that the device flushes
 * the internal cache before we close.
 */
static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
{
	if (flush && pkt_flush_cache(pd))
2254
		pkt_dbg(1, pd, "not flushing cache\n");
L
Linus Torvalds 已提交
2255 2256 2257 2258

	pkt_lock_door(pd, 0);

	pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2259
	blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
2260 2261

	pkt_shrink_pktlist(pd);
L
Linus Torvalds 已提交
2262 2263
}

2264
static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
L
Linus Torvalds 已提交
2265 2266 2267 2268 2269 2270
{
	if (dev_minor >= MAX_WRITERS)
		return NULL;
	return pkt_devs[dev_minor];
}

A
Al Viro 已提交
2271
static int pkt_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
2272 2273 2274 2275
{
	struct pktcdvd_device *pd = NULL;
	int ret;

2276
	mutex_lock(&pktcdvd_mutex);
2277
	mutex_lock(&ctl_mutex);
A
Al Viro 已提交
2278
	pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
L
Linus Torvalds 已提交
2279 2280 2281 2282 2283 2284 2285
	if (!pd) {
		ret = -ENODEV;
		goto out;
	}
	BUG_ON(pd->refcnt < 0);

	pd->refcnt++;
2286
	if (pd->refcnt > 1) {
A
Al Viro 已提交
2287
		if ((mode & FMODE_WRITE) &&
2288 2289 2290 2291 2292
		    !test_bit(PACKET_WRITABLE, &pd->flags)) {
			ret = -EBUSY;
			goto out_dec;
		}
	} else {
A
Al Viro 已提交
2293
		ret = pkt_open_dev(pd, mode & FMODE_WRITE);
2294
		if (ret)
L
Linus Torvalds 已提交
2295 2296 2297 2298 2299
			goto out_dec;
		/*
		 * needed here as well, since ext2 (among others) may change
		 * the blocksize at mount time
		 */
A
Al Viro 已提交
2300
		set_blocksize(bdev, CD_FRAMESIZE);
L
Linus Torvalds 已提交
2301 2302
	}

2303
	mutex_unlock(&ctl_mutex);
2304
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2305 2306 2307 2308 2309
	return 0;

out_dec:
	pd->refcnt--;
out:
2310
	mutex_unlock(&ctl_mutex);
2311
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2312 2313 2314
	return ret;
}

2315
static void pkt_close(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
2316
{
A
Al Viro 已提交
2317
	struct pktcdvd_device *pd = disk->private_data;
L
Linus Torvalds 已提交
2318

2319
	mutex_lock(&pktcdvd_mutex);
2320
	mutex_lock(&ctl_mutex);
L
Linus Torvalds 已提交
2321 2322 2323 2324 2325 2326
	pd->refcnt--;
	BUG_ON(pd->refcnt < 0);
	if (pd->refcnt == 0) {
		int flush = test_bit(PACKET_WRITABLE, &pd->flags);
		pkt_release_dev(pd, flush);
	}
2327
	mutex_unlock(&ctl_mutex);
2328
	mutex_unlock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2329 2330 2331
}


2332
static void pkt_end_io_read_cloned(struct bio *bio, int err)
L
Linus Torvalds 已提交
2333 2334 2335 2336 2337
{
	struct packet_stacked_data *psd = bio->bi_private;
	struct pktcdvd_device *pd = psd->pd;

	bio_put(bio);
2338
	bio_endio(psd->bio, err);
L
Linus Torvalds 已提交
2339 2340 2341 2342
	mempool_free(psd, psd_pool);
	pkt_bio_finished(pd);
}

K
Kent Overstreet 已提交
2343
static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
L
Linus Torvalds 已提交
2344
{
K
Kent Overstreet 已提交
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
	struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
	struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);

	psd->pd = pd;
	psd->bio = bio;
	cloned_bio->bi_bdev = pd->bdev;
	cloned_bio->bi_private = psd;
	cloned_bio->bi_end_io = pkt_end_io_read_cloned;
	pd->stats.secs_r += bio_sectors(bio);
	pkt_queue_bio(pd, cloned_bio);
}

static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
{
	struct pktcdvd_device *pd = q->queuedata;
L
Linus Torvalds 已提交
2360 2361 2362 2363 2364
	sector_t zone;
	struct packet_data *pkt;
	int was_empty, blocked_bio;
	struct pkt_rb_node *node;

2365
	zone = get_zone(bio->bi_iter.bi_sector, pd);
L
Linus Torvalds 已提交
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377

	/*
	 * If we find a matching packet in state WAITING or READ_WAIT, we can
	 * just append this bio to that packet.
	 */
	spin_lock(&pd->cdrw.active_list_lock);
	blocked_bio = 0;
	list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
		if (pkt->sector == zone) {
			spin_lock(&pkt->lock);
			if ((pkt->state == PACKET_WAITING_STATE) ||
			    (pkt->state == PACKET_READ_WAIT_STATE)) {
2378
				bio_list_add(&pkt->orig_bios, bio);
2379 2380
				pkt->write_size +=
					bio->bi_iter.bi_size / CD_FRAMESIZE;
L
Linus Torvalds 已提交
2381 2382 2383 2384 2385 2386 2387
				if ((pkt->write_size >= pkt->frames) &&
				    (pkt->state == PACKET_WAITING_STATE)) {
					atomic_inc(&pkt->run_sm);
					wake_up(&pd->wqueue);
				}
				spin_unlock(&pkt->lock);
				spin_unlock(&pd->cdrw.active_list_lock);
2388
				return;
L
Linus Torvalds 已提交
2389 2390 2391 2392 2393 2394 2395 2396
			} else {
				blocked_bio = 1;
			}
			spin_unlock(&pkt->lock);
		}
	}
	spin_unlock(&pd->cdrw.active_list_lock);

2397 2398 2399 2400 2401 2402 2403 2404
 	/*
	 * Test if there is enough room left in the bio work queue
	 * (queue size >= congestion on mark).
	 * If not, wait till the work queue size is below the congestion off mark.
	 */
	spin_lock(&pd->lock);
	if (pd->write_congestion_on > 0
	    && pd->bio_queue_size >= pd->write_congestion_on) {
2405
		set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC);
2406 2407
		do {
			spin_unlock(&pd->lock);
2408
			congestion_wait(BLK_RW_ASYNC, HZ);
2409 2410 2411 2412 2413
			spin_lock(&pd->lock);
		} while(pd->bio_queue_size > pd->write_congestion_off);
	}
	spin_unlock(&pd->lock);

L
Linus Torvalds 已提交
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438
	/*
	 * No matching packet found. Store the bio in the work queue.
	 */
	node = mempool_alloc(pd->rb_pool, GFP_NOIO);
	node->bio = bio;
	spin_lock(&pd->lock);
	BUG_ON(pd->bio_queue_size < 0);
	was_empty = (pd->bio_queue_size == 0);
	pkt_rbtree_insert(pd, node);
	spin_unlock(&pd->lock);

	/*
	 * Wake up the worker thread.
	 */
	atomic_set(&pd->scan_queue, 1);
	if (was_empty) {
		/* This wake_up is required for correct operation */
		wake_up(&pd->wqueue);
	} else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
		/*
		 * This wake up is not required for correct operation,
		 * but improves performance in some cases.
		 */
		wake_up(&pd->wqueue);
	}
K
Kent Overstreet 已提交
2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
}

static void pkt_make_request(struct request_queue *q, struct bio *bio)
{
	struct pktcdvd_device *pd;
	char b[BDEVNAME_SIZE];
	struct bio *split;

	pd = q->queuedata;
	if (!pd) {
		pr_err("%s incorrect request queue\n",
		       bdevname(bio->bi_bdev, b));
		goto end_io;
	}

	pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
		(unsigned long long)bio->bi_iter.bi_sector,
		(unsigned long long)bio_end_sector(bio));

	/*
	 * Clone READ bios so we can have our own bi_end_io callback.
	 */
	if (bio_data_dir(bio) == READ) {
		pkt_make_request_read(pd, bio);
		return;
	}

	if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
		pkt_notice(pd, "WRITE for ro device (%llu)\n",
			   (unsigned long long)bio->bi_iter.bi_sector);
		goto end_io;
	}

	if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
		pkt_err(pd, "wrong bio size\n");
		goto end_io;
	}

	blk_queue_bounce(q, &bio);

	do {
		sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
		sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);

		if (last_zone != zone) {
			BUG_ON(last_zone != zone + pd->settings.size);

			split = bio_split(bio, last_zone -
					  bio->bi_iter.bi_sector,
					  GFP_NOIO, fs_bio_set);
			bio_chain(split, bio);
		} else {
			split = bio;
		}

		pkt_make_request_write(q, split);
	} while (split != bio);

2497
	return;
L
Linus Torvalds 已提交
2498
end_io:
2499
	bio_io_error(bio);
L
Linus Torvalds 已提交
2500 2501 2502 2503
}



2504 2505
static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
			  struct bio_vec *bvec)
L
Linus Torvalds 已提交
2506 2507
{
	struct pktcdvd_device *pd = q->queuedata;
2508
	sector_t zone = get_zone(bmd->bi_sector, pd);
2509
	int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
L
Linus Torvalds 已提交
2510 2511 2512 2513 2514 2515 2516
	int remaining = (pd->settings.size << 9) - used;
	int remaining2;

	/*
	 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
	 * boundary, pkt_make_request() will split the bio.
	 */
2517
	remaining2 = PAGE_SIZE - bmd->bi_size;
L
Linus Torvalds 已提交
2518 2519 2520 2521 2522 2523 2524 2525
	remaining = max(remaining, remaining2);

	BUG_ON(remaining < 0);
	return remaining;
}

static void pkt_init_queue(struct pktcdvd_device *pd)
{
2526
	struct request_queue *q = pd->disk->queue;
L
Linus Torvalds 已提交
2527 2528

	blk_queue_make_request(q, pkt_make_request);
2529
	blk_queue_logical_block_size(q, CD_FRAMESIZE);
2530
	blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
L
Linus Torvalds 已提交
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590
	blk_queue_merge_bvec(q, pkt_merge_bvec);
	q->queuedata = pd;
}

static int pkt_seq_show(struct seq_file *m, void *p)
{
	struct pktcdvd_device *pd = m->private;
	char *msg;
	char bdev_buf[BDEVNAME_SIZE];
	int states[PACKET_NUM_STATES];

	seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
		   bdevname(pd->bdev, bdev_buf));

	seq_printf(m, "\nSettings:\n");
	seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);

	if (pd->settings.write_type == 0)
		msg = "Packet";
	else
		msg = "Unknown";
	seq_printf(m, "\twrite type:\t\t%s\n", msg);

	seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
	seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);

	seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);

	if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
		msg = "Mode 1";
	else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
		msg = "Mode 2";
	else
		msg = "Unknown";
	seq_printf(m, "\tblock mode:\t\t%s\n", msg);

	seq_printf(m, "\nStatistics:\n");
	seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
	seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
	seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
	seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
	seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);

	seq_printf(m, "\nMisc:\n");
	seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
	seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
	seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
	seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
	seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
	seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);

	seq_printf(m, "\nQueue state:\n");
	seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
	seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
	seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);

	pkt_count_states(pd, states);
	seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
		   states[0], states[1], states[2], states[3], states[4], states[5]);

2591 2592 2593
	seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
			pd->write_congestion_off,
			pd->write_congestion_on);
L
Linus Torvalds 已提交
2594 2595 2596 2597 2598
	return 0;
}

static int pkt_seq_open(struct inode *inode, struct file *file)
{
A
Al Viro 已提交
2599
	return single_open(file, pkt_seq_show, PDE_DATA(inode));
L
Linus Torvalds 已提交
2600 2601
}

2602
static const struct file_operations pkt_proc_fops = {
L
Linus Torvalds 已提交
2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
	.open	= pkt_seq_open,
	.read	= seq_read,
	.llseek	= seq_lseek,
	.release = single_release
};

static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
{
	int i;
	int ret = 0;
	char b[BDEVNAME_SIZE];
	struct block_device *bdev;

	if (pd->pkt_dev == dev) {
2617
		pkt_err(pd, "recursive setup not allowed\n");
L
Linus Torvalds 已提交
2618 2619 2620 2621 2622 2623 2624
		return -EBUSY;
	}
	for (i = 0; i < MAX_WRITERS; i++) {
		struct pktcdvd_device *pd2 = pkt_devs[i];
		if (!pd2)
			continue;
		if (pd2->bdev->bd_dev == dev) {
2625 2626
			pkt_err(pd, "%s already setup\n",
				bdevname(pd2->bdev, b));
L
Linus Torvalds 已提交
2627 2628 2629
			return -EBUSY;
		}
		if (pd2->pkt_dev == dev) {
2630
			pkt_err(pd, "can't chain pktcdvd devices\n");
L
Linus Torvalds 已提交
2631 2632 2633 2634 2635 2636 2637
			return -EBUSY;
		}
	}

	bdev = bdget(dev);
	if (!bdev)
		return -ENOMEM;
2638
	ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
L
Linus Torvalds 已提交
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652
	if (ret)
		return ret;

	/* This is safe, since we have a reference from open(). */
	__module_get(THIS_MODULE);

	pd->bdev = bdev;
	set_blocksize(bdev, CD_FRAMESIZE);

	pkt_init_queue(pd);

	atomic_set(&pd->cdrw.pending_bios, 0);
	pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
	if (IS_ERR(pd->cdrw.thread)) {
2653
		pkt_err(pd, "can't start kernel thread\n");
L
Linus Torvalds 已提交
2654
		ret = -ENOMEM;
2655
		goto out_mem;
L
Linus Torvalds 已提交
2656 2657
	}

2658
	proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
2659
	pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b));
L
Linus Torvalds 已提交
2660 2661 2662
	return 0;

out_mem:
2663
	blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
L
Linus Torvalds 已提交
2664 2665 2666 2667 2668
	/* This is safe: open() is still holding a reference. */
	module_put(THIS_MODULE);
	return ret;
}

A
Al Viro 已提交
2669
static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
2670
{
A
Al Viro 已提交
2671
	struct pktcdvd_device *pd = bdev->bd_disk->private_data;
2672
	int ret;
L
Linus Torvalds 已提交
2673

2674
	pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
2675
		cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
L
Linus Torvalds 已提交
2676

2677
	mutex_lock(&pktcdvd_mutex);
L
Linus Torvalds 已提交
2678
	switch (cmd) {
2679 2680 2681 2682 2683 2684 2685 2686
	case CDROMEJECT:
		/*
		 * The door gets locked when the device is opened, so we
		 * have to unlock it or else the eject command fails.
		 */
		if (pd->refcnt == 1)
			pkt_lock_door(pd, 0);
		/* fallthru */
L
Linus Torvalds 已提交
2687 2688 2689 2690 2691 2692 2693 2694
	/*
	 * forward selected CDROM ioctls to CD-ROM, for UDF
	 */
	case CDROMMULTISESSION:
	case CDROMREADTOCENTRY:
	case CDROM_LAST_WRITTEN:
	case CDROM_SEND_PACKET:
	case SCSI_IOCTL_SEND_COMMAND:
2695 2696
		ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
		break;
L
Linus Torvalds 已提交
2697 2698

	default:
2699
		pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
2700
		ret = -ENOTTY;
L
Linus Torvalds 已提交
2701
	}
2702
	mutex_unlock(&pktcdvd_mutex);
2703

2704
	return ret;
L
Linus Torvalds 已提交
2705 2706
}

2707 2708
static unsigned int pkt_check_events(struct gendisk *disk,
				     unsigned int clearing)
L
Linus Torvalds 已提交
2709 2710 2711 2712 2713 2714 2715 2716 2717
{
	struct pktcdvd_device *pd = disk->private_data;
	struct gendisk *attached_disk;

	if (!pd)
		return 0;
	if (!pd->bdev)
		return 0;
	attached_disk = pd->bdev->bd_disk;
2718
	if (!attached_disk || !attached_disk->fops->check_events)
L
Linus Torvalds 已提交
2719
		return 0;
2720
	return attached_disk->fops->check_events(attached_disk, clearing);
L
Linus Torvalds 已提交
2721 2722
}

2723
static const struct block_device_operations pktcdvd_ops = {
L
Linus Torvalds 已提交
2724
	.owner =		THIS_MODULE,
A
Al Viro 已提交
2725 2726
	.open =			pkt_open,
	.release =		pkt_close,
2727
	.ioctl =		pkt_ioctl,
2728
	.check_events =		pkt_check_events,
L
Linus Torvalds 已提交
2729 2730
};

2731
static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode)
2732 2733 2734 2735
{
	return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name);
}

L
Linus Torvalds 已提交
2736 2737 2738
/*
 * Set up mapping from pktcdvd device to CD-ROM device.
 */
2739
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
L
Linus Torvalds 已提交
2740 2741 2742 2743 2744
{
	int idx;
	int ret = -ENOMEM;
	struct pktcdvd_device *pd;
	struct gendisk *disk;
2745 2746

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
2747 2748 2749 2750 2751

	for (idx = 0; idx < MAX_WRITERS; idx++)
		if (!pkt_devs[idx])
			break;
	if (idx == MAX_WRITERS) {
2752
		pr_err("max %d writers supported\n", MAX_WRITERS);
2753 2754
		ret = -EBUSY;
		goto out_mutex;
L
Linus Torvalds 已提交
2755 2756
	}

2757
	pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
L
Linus Torvalds 已提交
2758
	if (!pd)
2759
		goto out_mutex;
L
Linus Torvalds 已提交
2760

2761 2762
	pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
						  sizeof(struct pkt_rb_node));
L
Linus Torvalds 已提交
2763 2764 2765
	if (!pd->rb_pool)
		goto out_mem;

2766 2767 2768 2769
	INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
	INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
	spin_lock_init(&pd->cdrw.active_list_lock);

L
Linus Torvalds 已提交
2770 2771
	spin_lock_init(&pd->lock);
	spin_lock_init(&pd->iosched.lock);
2772 2773
	bio_list_init(&pd->iosched.read_queue);
	bio_list_init(&pd->iosched.write_queue);
2774
	sprintf(pd->name, DRIVER_NAME"%d", idx);
L
Linus Torvalds 已提交
2775 2776 2777
	init_waitqueue_head(&pd->wqueue);
	pd->bio_queue = RB_ROOT;

2778 2779 2780
	pd->write_congestion_on  = write_congestion_on;
	pd->write_congestion_off = write_congestion_off;

2781 2782 2783 2784
	disk = alloc_disk(1);
	if (!disk)
		goto out_mem;
	pd->disk = disk;
2785
	disk->major = pktdev_major;
L
Linus Torvalds 已提交
2786 2787 2788
	disk->first_minor = idx;
	disk->fops = &pktcdvd_ops;
	disk->flags = GENHD_FL_REMOVABLE;
2789
	strcpy(disk->disk_name, pd->name);
2790
	disk->devnode = pktcdvd_devnode;
L
Linus Torvalds 已提交
2791 2792 2793 2794 2795
	disk->private_data = pd;
	disk->queue = blk_alloc_queue(GFP_KERNEL);
	if (!disk->queue)
		goto out_mem2;

2796
	pd->pkt_dev = MKDEV(pktdev_major, idx);
L
Linus Torvalds 已提交
2797 2798 2799 2800
	ret = pkt_new_dev(pd, dev);
	if (ret)
		goto out_new_dev;

2801 2802 2803 2804
	/* inherit events of the host device */
	disk->events = pd->bdev->bd_disk->events;
	disk->async_events = pd->bdev->bd_disk->async_events;

L
Linus Torvalds 已提交
2805
	add_disk(disk);
2806

2807 2808 2809
	pkt_sysfs_dev_new(pd);
	pkt_debugfs_dev_new(pd);

L
Linus Torvalds 已提交
2810
	pkt_devs[idx] = pd;
2811 2812 2813 2814
	if (pkt_dev)
		*pkt_dev = pd->pkt_dev;

	mutex_unlock(&ctl_mutex);
L
Linus Torvalds 已提交
2815 2816 2817
	return 0;

out_new_dev:
2818
	blk_cleanup_queue(disk->queue);
L
Linus Torvalds 已提交
2819 2820 2821 2822 2823 2824
out_mem2:
	put_disk(disk);
out_mem:
	if (pd->rb_pool)
		mempool_destroy(pd->rb_pool);
	kfree(pd);
2825 2826
out_mutex:
	mutex_unlock(&ctl_mutex);
2827
	pr_err("setup of pktcdvd device failed\n");
L
Linus Torvalds 已提交
2828 2829 2830 2831 2832 2833
	return ret;
}

/*
 * Tear down mapping from pktcdvd device to CD-ROM device.
 */
2834
static int pkt_remove_dev(dev_t pkt_dev)
L
Linus Torvalds 已提交
2835 2836 2837
{
	struct pktcdvd_device *pd;
	int idx;
2838 2839 2840
	int ret = 0;

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
2841 2842 2843 2844 2845 2846 2847

	for (idx = 0; idx < MAX_WRITERS; idx++) {
		pd = pkt_devs[idx];
		if (pd && (pd->pkt_dev == pkt_dev))
			break;
	}
	if (idx == MAX_WRITERS) {
2848
		pr_debug("dev not setup\n");
2849 2850
		ret = -ENXIO;
		goto out;
L
Linus Torvalds 已提交
2851 2852
	}

2853 2854 2855 2856
	if (pd->refcnt > 0) {
		ret = -EBUSY;
		goto out;
	}
L
Linus Torvalds 已提交
2857 2858 2859
	if (!IS_ERR(pd->cdrw.thread))
		kthread_stop(pd->cdrw.thread);

2860 2861 2862 2863 2864
	pkt_devs[idx] = NULL;

	pkt_debugfs_dev_remove(pd);
	pkt_sysfs_dev_remove(pd);

2865
	blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
L
Linus Torvalds 已提交
2866 2867

	remove_proc_entry(pd->name, pkt_proc);
2868
	pkt_dbg(1, pd, "writer unmapped\n");
L
Linus Torvalds 已提交
2869 2870

	del_gendisk(pd->disk);
2871
	blk_cleanup_queue(pd->disk->queue);
L
Linus Torvalds 已提交
2872 2873 2874 2875 2876 2877 2878
	put_disk(pd->disk);

	mempool_destroy(pd->rb_pool);
	kfree(pd);

	/* This is safe: open() is still holding a reference. */
	module_put(THIS_MODULE);
2879 2880 2881 2882

out:
	mutex_unlock(&ctl_mutex);
	return ret;
L
Linus Torvalds 已提交
2883 2884 2885 2886
}

static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
{
2887 2888 2889 2890 2891
	struct pktcdvd_device *pd;

	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);

	pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
L
Linus Torvalds 已提交
2892 2893 2894 2895 2896 2897 2898 2899
	if (pd) {
		ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
		ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
	} else {
		ctrl_cmd->dev = 0;
		ctrl_cmd->pkt_dev = 0;
	}
	ctrl_cmd->num_devices = MAX_WRITERS;
2900 2901

	mutex_unlock(&ctl_mutex);
L
Linus Torvalds 已提交
2902 2903
}

2904
static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
2905 2906 2907 2908
{
	void __user *argp = (void __user *)arg;
	struct pkt_ctrl_command ctrl_cmd;
	int ret = 0;
2909
	dev_t pkt_dev = 0;
L
Linus Torvalds 已提交
2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920

	if (cmd != PACKET_CTRL_CMD)
		return -ENOTTY;

	if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
		return -EFAULT;

	switch (ctrl_cmd.command) {
	case PKT_CTRL_CMD_SETUP:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
2921 2922
		ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
		ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
L
Linus Torvalds 已提交
2923 2924 2925 2926
		break;
	case PKT_CTRL_CMD_TEARDOWN:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
2927
		ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
L
Linus Torvalds 已提交
2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940
		break;
	case PKT_CTRL_CMD_STATUS:
		pkt_get_status(&ctrl_cmd);
		break;
	default:
		return -ENOTTY;
	}

	if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
		return -EFAULT;
	return ret;
}

2941 2942 2943 2944 2945 2946
#ifdef CONFIG_COMPAT
static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
L
Linus Torvalds 已提交
2947

2948
static const struct file_operations pkt_ctl_fops = {
2949 2950 2951 2952 2953 2954
	.open		= nonseekable_open,
	.unlocked_ioctl	= pkt_ctl_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= pkt_ctl_compat_ioctl,
#endif
	.owner		= THIS_MODULE,
2955
	.llseek		= no_llseek,
L
Linus Torvalds 已提交
2956 2957 2958 2959
};

static struct miscdevice pkt_misc = {
	.minor 		= MISC_DYNAMIC_MINOR,
2960
	.name  		= DRIVER_NAME,
2961
	.nodename	= "pktcdvd/control",
L
Linus Torvalds 已提交
2962 2963 2964 2965 2966 2967 2968
	.fops  		= &pkt_ctl_fops
};

static int __init pkt_init(void)
{
	int ret;

2969 2970
	mutex_init(&ctl_mutex);

2971 2972
	psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
					sizeof(struct packet_stacked_data));
L
Linus Torvalds 已提交
2973 2974 2975
	if (!psd_pool)
		return -ENOMEM;

2976
	ret = register_blkdev(pktdev_major, DRIVER_NAME);
L
Linus Torvalds 已提交
2977
	if (ret < 0) {
2978
		pr_err("unable to register block device\n");
L
Linus Torvalds 已提交
2979 2980
		goto out2;
	}
2981 2982
	if (!pktdev_major)
		pktdev_major = ret;
L
Linus Torvalds 已提交
2983

2984 2985 2986 2987 2988 2989
	ret = pkt_sysfs_init();
	if (ret)
		goto out;

	pkt_debugfs_init();

L
Linus Torvalds 已提交
2990 2991
	ret = misc_register(&pkt_misc);
	if (ret) {
2992
		pr_err("unable to register misc device\n");
2993
		goto out_misc;
L
Linus Torvalds 已提交
2994 2995
	}

A
Alexey Dobriyan 已提交
2996
	pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
L
Linus Torvalds 已提交
2997 2998 2999

	return 0;

3000 3001 3002
out_misc:
	pkt_debugfs_cleanup();
	pkt_sysfs_cleanup();
L
Linus Torvalds 已提交
3003
out:
3004
	unregister_blkdev(pktdev_major, DRIVER_NAME);
L
Linus Torvalds 已提交
3005 3006 3007 3008 3009 3010 3011
out2:
	mempool_destroy(psd_pool);
	return ret;
}

static void __exit pkt_exit(void)
{
A
Alexey Dobriyan 已提交
3012
	remove_proc_entry("driver/"DRIVER_NAME, NULL);
L
Linus Torvalds 已提交
3013
	misc_deregister(&pkt_misc);
3014 3015 3016 3017

	pkt_debugfs_cleanup();
	pkt_sysfs_cleanup();

3018
	unregister_blkdev(pktdev_major, DRIVER_NAME);
L
Linus Torvalds 已提交
3019 3020 3021 3022 3023 3024 3025 3026 3027
	mempool_destroy(psd_pool);
}

MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
MODULE_LICENSE("GPL");

module_init(pkt_init);
module_exit(pkt_exit);