err.no Git - linux-2.6/blob - drivers/block/pktcdvd.c

   1 /*
   2  * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
   3  * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
   4  *
   5  * May be copied or modified under the terms of the GNU General Public
   6  * License.  See linux/COPYING for more information.
   7  *
   8  * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
   9  * DVD-RW devices (aka an exercise in block layer masturbation)
  10  *
  11  *
  12  * TODO: (circa order of when I will fix it)
  13  * - Only able to write on CD-RW media right now.
  14  * - check host application code on media and set it in write page
  15  * - interface for UDF <-> packet to negotiate a new location when a write
  16  *   fails.
  17  * - handle OPC, especially for -RW media
  18  *
  19  * Theory of operation:
  20  *
  21  * We use a custom make_request_fn function that forwards reads directly to
  22  * the underlying CD device. Write requests are either attached directly to
  23  * a live packet_data object, or simply stored sequentially in a list for
  24  * later processing by the kcdrwd kernel thread. This driver doesn't use
  25  * any elevator functionally as defined by the elevator_s struct, but the
  26  * underlying CD device uses a standard elevator.
  27  *
  28  * This strategy makes it possible to do very late merging of IO requests.
  29  * A new bio sent to pkt_make_request can be merged with a live packet_data
  30  * object even if the object is in the data gathering state.
  31  *
  32  *************************************************************************/
  33
  34 #define VERSION_CODE    "v0.2.0a 2004-07-14 Jens Axboe (axboe@suse.de) and petero2@telia.com"
  35
  36 #include <linux/pktcdvd.h>
  37 #include <linux/config.h>
  38 #include <linux/module.h>
  39 #include <linux/types.h>
  40 #include <linux/kernel.h>
  41 #include <linux/kthread.h>
  42 #include <linux/errno.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/file.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/seq_file.h>
  47 #include <linux/miscdevice.h>
  48 #include <linux/suspend.h>
  49 #include <scsi/scsi_cmnd.h>
  50 #include <scsi/scsi_ioctl.h>
  51
  52 #include <asm/uaccess.h>
  53
  54 #if PACKET_DEBUG
  55 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
  56 #else
  57 #define DPRINTK(fmt, args...)
  58 #endif
  59
  60 #if PACKET_DEBUG > 1
  61 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
  62 #else
  63 #define VPRINTK(fmt, args...)
  64 #endif
  65
  66 #define MAX_SPEED 0xffff
  67
  68 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
  69
  70 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
  71 static struct proc_dir_entry *pkt_proc;
  72 static int pkt_major;
  73 static struct semaphore ctl_mutex;      /* Serialize open/close/setup/teardown */
  74 static mempool_t *psd_pool;
  75
  76
  77 static void pkt_bio_finished(struct pktcdvd_device *pd)
  78 {
  79         BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
  80         if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
  81                 VPRINTK("pktcdvd: queue empty\n");
  82                 atomic_set(&pd->iosched.attention, 1);
  83                 wake_up(&pd->wqueue);
  84         }
  85 }
  86
  87 static void pkt_bio_destructor(struct bio *bio)
  88 {
  89         kfree(bio->bi_io_vec);
  90         kfree(bio);
  91 }
  92
  93 static struct bio *pkt_bio_alloc(int nr_iovecs)
  94 {
  95         struct bio_vec *bvl = NULL;
  96         struct bio *bio;
  97
  98         bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
  99         if (!bio)
 100                 goto no_bio;
 101         bio_init(bio);
 102
 103         bvl = kmalloc(nr_iovecs * sizeof(struct bio_vec), GFP_KERNEL);
 104         if (!bvl)
 105                 goto no_bvl;
 106         memset(bvl, 0, nr_iovecs * sizeof(struct bio_vec));
 107
 108         bio->bi_max_vecs = nr_iovecs;
 109         bio->bi_io_vec = bvl;
 110         bio->bi_destructor = pkt_bio_destructor;
 111
 112         return bio;
 113
 114  no_bvl:
 115         kfree(bio);
 116  no_bio:
 117         return NULL;
 118 }
 119
 120 /*
 121  * Allocate a packet_data struct
 122  */
 123 static struct packet_data *pkt_alloc_packet_data(void)
 124 {
 125         int i;
 126         struct packet_data *pkt;
 127
 128         pkt = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
 129         if (!pkt)
 130                 goto no_pkt;
 131         memset(pkt, 0, sizeof(struct packet_data));
 132
 133         pkt->w_bio = pkt_bio_alloc(PACKET_MAX_SIZE);
 134         if (!pkt->w_bio)
 135                 goto no_bio;
 136
 137         for (i = 0; i < PAGES_PER_PACKET; i++) {
 138                 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
 139                 if (!pkt->pages[i])
 140                         goto no_page;
 141         }
 142
 143         spin_lock_init(&pkt->lock);
 144
 145         for (i = 0; i < PACKET_MAX_SIZE; i++) {
 146                 struct bio *bio = pkt_bio_alloc(1);
 147                 if (!bio)
 148                         goto no_rd_bio;
 149                 pkt->r_bios[i] = bio;
 150         }
 151
 152         return pkt;
 153
 154 no_rd_bio:
 155         for (i = 0; i < PACKET_MAX_SIZE; i++) {
 156                 struct bio *bio = pkt->r_bios[i];
 157                 if (bio)
 158                         bio_put(bio);
 159         }
 160
 161 no_page:
 162         for (i = 0; i < PAGES_PER_PACKET; i++)
 163                 if (pkt->pages[i])
 164                         __free_page(pkt->pages[i]);
 165         bio_put(pkt->w_bio);
 166 no_bio:
 167         kfree(pkt);
 168 no_pkt:
 169         return NULL;
 170 }
 171
 172 /*
 173  * Free a packet_data struct
 174  */
 175 static void pkt_free_packet_data(struct packet_data *pkt)
 176 {
 177         int i;
 178
 179         for (i = 0; i < PACKET_MAX_SIZE; i++) {
 180                 struct bio *bio = pkt->r_bios[i];
 181                 if (bio)
 182                         bio_put(bio);
 183         }
 184         for (i = 0; i < PAGES_PER_PACKET; i++)
 185                 __free_page(pkt->pages[i]);
 186         bio_put(pkt->w_bio);
 187         kfree(pkt);
 188 }
 189
 190 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
 191 {
 192         struct packet_data *pkt, *next;
 193
 194         BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
 195
 196         list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
 197                 pkt_free_packet_data(pkt);
 198         }
 199 }
 200
 201 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
 202 {
 203         struct packet_data *pkt;
 204
 205         INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
 206         INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
 207         spin_lock_init(&pd->cdrw.active_list_lock);
 208         while (nr_packets > 0) {
 209                 pkt = pkt_alloc_packet_data();
 210                 if (!pkt) {
 211                         pkt_shrink_pktlist(pd);
 212                         return 0;
 213                 }
 214                 pkt->id = nr_packets;
 215                 pkt->pd = pd;
 216                 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
 217                 nr_packets--;
 218         }
 219         return 1;
 220 }
 221
 222 static void *pkt_rb_alloc(unsigned int __nocast gfp_mask, void *data)
 223 {
 224         return kmalloc(sizeof(struct pkt_rb_node), gfp_mask);
 225 }
 226
 227 static void pkt_rb_free(void *ptr, void *data)
 228 {
 229         kfree(ptr);
 230 }
 231
 232 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
 233 {
 234         struct rb_node *n = rb_next(&node->rb_node);
 235         if (!n)
 236                 return NULL;
 237         return rb_entry(n, struct pkt_rb_node, rb_node);
 238 }
 239
 240 static inline void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
 241 {
 242         rb_erase(&node->rb_node, &pd->bio_queue);
 243         mempool_free(node, pd->rb_pool);
 244         pd->bio_queue_size--;
 245         BUG_ON(pd->bio_queue_size < 0);
 246 }
 247
 248 /*
 249  * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
 250  */
 251 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
 252 {
 253         struct rb_node *n = pd->bio_queue.rb_node;
 254         struct rb_node *next;
 255         struct pkt_rb_node *tmp;
 256
 257         if (!n) {
 258                 BUG_ON(pd->bio_queue_size > 0);
 259                 return NULL;
 260         }
 261
 262         for (;;) {
 263                 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
 264                 if (s <= tmp->bio->bi_sector)
 265                         next = n->rb_left;
 266                 else
 267                         next = n->rb_right;
 268                 if (!next)
 269                         break;
 270                 n = next;
 271         }
 272
 273         if (s > tmp->bio->bi_sector) {
 274                 tmp = pkt_rbtree_next(tmp);
 275                 if (!tmp)
 276                         return NULL;
 277         }
 278         BUG_ON(s > tmp->bio->bi_sector);
 279         return tmp;
 280 }
 281
 282 /*
 283  * Insert a node into the pd->bio_queue rb tree.
 284  */
 285 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
 286 {
 287         struct rb_node **p = &pd->bio_queue.rb_node;
 288         struct rb_node *parent = NULL;
 289         sector_t s = node->bio->bi_sector;
 290         struct pkt_rb_node *tmp;
 291
 292         while (*p) {
 293                 parent = *p;
 294                 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
 295                 if (s < tmp->bio->bi_sector)
 296                         p = &(*p)->rb_left;
 297                 else
 298                         p = &(*p)->rb_right;
 299         }
 300         rb_link_node(&node->rb_node, parent, p);
 301         rb_insert_color(&node->rb_node, &pd->bio_queue);
 302         pd->bio_queue_size++;
 303 }
 304
 305 /*
 306  * Add a bio to a single linked list defined by its head and tail pointers.
 307  */
 308 static inline void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
 309 {
 310         bio->bi_next = NULL;
 311         if (*list_tail) {
 312                 BUG_ON((*list_head) == NULL);
 313                 (*list_tail)->bi_next = bio;
 314                 (*list_tail) = bio;
 315         } else {
 316                 BUG_ON((*list_head) != NULL);
 317                 (*list_head) = bio;
 318                 (*list_tail) = bio;
 319         }
 320 }
 321
 322 /*
 323  * Remove and return the first bio from a single linked list defined by its
 324  * head and tail pointers.
 325  */
 326 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
 327 {
 328         struct bio *bio;
 329
 330         if (*list_head == NULL)
 331                 return NULL;
 332
 333         bio = *list_head;
 334         *list_head = bio->bi_next;
 335         if (*list_head == NULL)
 336                 *list_tail = NULL;
 337
 338         bio->bi_next = NULL;
 339         return bio;
 340 }
 341
 342 /*
 343  * Send a packet_command to the underlying block device and
 344  * wait for completion.
 345  */
 346 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
 347 {
 348         char sense[SCSI_SENSE_BUFFERSIZE];
 349         request_queue_t *q;
 350         struct request *rq;
 351         DECLARE_COMPLETION(wait);
 352         int err = 0;
 353
 354         q = bdev_get_queue(pd->bdev);
 355
 356         rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ,
 357                              __GFP_WAIT);
 358         rq->errors = 0;
 359         rq->rq_disk = pd->bdev->bd_disk;
 360         rq->bio = NULL;
 361         rq->buffer = NULL;
 362         rq->timeout = 60*HZ;
 363         rq->data = cgc->buffer;
 364         rq->data_len = cgc->buflen;
 365         rq->sense = sense;
 366         memset(sense, 0, sizeof(sense));
 367         rq->sense_len = 0;
 368         rq->flags |= REQ_BLOCK_PC | REQ_HARDBARRIER;
 369         if (cgc->quiet)
 370                 rq->flags |= REQ_QUIET;
 371         memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
 372         if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
 373                 memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
 374
 375         rq->ref_count++;
 376         rq->flags |= REQ_NOMERGE;
 377         rq->waiting = &wait;
 378         rq->end_io = blk_end_sync_rq;
 379         elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
 380         generic_unplug_device(q);
 381         wait_for_completion(&wait);
 382
 383         if (rq->errors)
 384                 err = -EIO;
 385
 386         blk_put_request(rq);
 387         return err;
 388 }
 389
 390 /*
 391  * A generic sense dump / resolve mechanism should be implemented across
 392  * all ATAPI + SCSI devices.
 393  */
 394 static void pkt_dump_sense(struct packet_command *cgc)
 395 {
 396         static char *info[9] = { "No sense", "Recovered error", "Not ready",
 397                                  "Medium error", "Hardware error", "Illegal request",
 398                                  "Unit attention", "Data protect", "Blank check" };
 399         int i;
 400         struct request_sense *sense = cgc->sense;
 401
 402         printk("pktcdvd:");
 403         for (i = 0; i < CDROM_PACKET_SIZE; i++)
 404                 printk(" %02x", cgc->cmd[i]);
 405         printk(" - ");
 406
 407         if (sense == NULL) {
 408                 printk("no sense\n");
 409                 return;
 410         }
 411
 412         printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
 413
 414         if (sense->sense_key > 8) {
 415                 printk(" (INVALID)\n");
 416                 return;
 417         }
 418
 419         printk(" (%s)\n", info[sense->sense_key]);
 420 }
 421
 422 /*
 423  * flush the drive cache to media
 424  */
 425 static int pkt_flush_cache(struct pktcdvd_device *pd)
 426 {
 427         struct packet_command cgc;
 428
 429         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
 430         cgc.cmd[0] = GPCMD_FLUSH_CACHE;
 431         cgc.quiet = 1;
 432
 433         /*
 434          * the IMMED bit -- we default to not setting it, although that
 435          * would allow a much faster close, this is safer
 436          */
 437 #if 0
 438         cgc.cmd[1] = 1 << 1;
 439 #endif
 440         return pkt_generic_packet(pd, &cgc);
 441 }
 442
 443 /*
 444  * speed is given as the normal factor, e.g. 4 for 4x
 445  */
 446 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
 447 {
 448         struct packet_command cgc;
 449         struct request_sense sense;
 450         int ret;
 451
 452         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
 453         cgc.sense = &sense;
 454         cgc.cmd[0] = GPCMD_SET_SPEED;
 455         cgc.cmd[2] = (read_speed >> 8) & 0xff;
 456         cgc.cmd[3] = read_speed & 0xff;
 457         cgc.cmd[4] = (write_speed >> 8) & 0xff;
 458         cgc.cmd[5] = write_speed & 0xff;
 459
 460         if ((ret = pkt_generic_packet(pd, &cgc)))
 461                 pkt_dump_sense(&cgc);
 462
 463         return ret;
 464 }
 465
 466 /*
 467  * Queue a bio for processing by the low-level CD device. Must be called
 468  * from process context.
 469  */
 470 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
 471 {
 472         spin_lock(&pd->iosched.lock);
 473         if (bio_data_dir(bio) == READ) {
 474                 pkt_add_list_last(bio, &pd->iosched.read_queue,
 475                                   &pd->iosched.read_queue_tail);
 476         } else {
 477                 pkt_add_list_last(bio, &pd->iosched.write_queue,
 478                                   &pd->iosched.write_queue_tail);
 479         }
 480         spin_unlock(&pd->iosched.lock);
 481
 482         atomic_set(&pd->iosched.attention, 1);
 483         wake_up(&pd->wqueue);
 484 }
 485
 486 /*
 487  * Process the queued read/write requests. This function handles special
 488  * requirements for CDRW drives:
 489  * - A cache flush command must be inserted before a read request if the
 490  *   previous request was a write.
 491  * - Switching between reading and writing is slow, so don't do it more often
 492  *   than necessary.
 493  * - Optimize for throughput at the expense of latency. This means that streaming
 494  *   writes will never be interrupted by a read, but if the drive has to seek
 495  *   before the next write, switch to reading instead if there are any pending
 496  *   read requests.
 497  * - Set the read speed according to current usage pattern. When only reading
 498  *   from the device, it's best to use the highest possible read speed, but
 499  *   when switching often between reading and writing, it's better to have the
 500  *   same read and write speeds.
 501  */
 502 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
 503 {
 504         request_queue_t *q;
 505
 506         if (atomic_read(&pd->iosched.attention) == 0)
 507                 return;
 508         atomic_set(&pd->iosched.attention, 0);
 509
 510         q = bdev_get_queue(pd->bdev);
 511
 512         for (;;) {
 513                 struct bio *bio;
 514                 int reads_queued, writes_queued;
 515
 516                 spin_lock(&pd->iosched.lock);
 517                 reads_queued = (pd->iosched.read_queue != NULL);
 518                 writes_queued = (pd->iosched.write_queue != NULL);
 519                 spin_unlock(&pd->iosched.lock);
 520
 521                 if (!reads_queued && !writes_queued)
 522                         break;
 523
 524                 if (pd->iosched.writing) {
 525                         int need_write_seek = 1;
 526                         spin_lock(&pd->iosched.lock);
 527                         bio = pd->iosched.write_queue;
 528                         spin_unlock(&pd->iosched.lock);
 529                         if (bio && (bio->bi_sector == pd->iosched.last_write))
 530                                 need_write_seek = 0;
 531                         if (need_write_seek && reads_queued) {
 532                                 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
 533                                         VPRINTK("pktcdvd: write, waiting\n");
 534                                         break;
 535                                 }
 536                                 pkt_flush_cache(pd);
 537                                 pd->iosched.writing = 0;
 538                         }
 539                 } else {
 540                         if (!reads_queued && writes_queued) {
 541                                 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
 542                                         VPRINTK("pktcdvd: read, waiting\n");
 543                                         break;
 544                                 }
 545                                 pd->iosched.writing = 1;
 546                         }
 547                 }
 548
 549                 spin_lock(&pd->iosched.lock);
 550                 if (pd->iosched.writing) {
 551                         bio = pkt_get_list_first(&pd->iosched.write_queue,
 552                                                  &pd->iosched.write_queue_tail);
 553                 } else {
 554                         bio = pkt_get_list_first(&pd->iosched.read_queue,
 555                                                  &pd->iosched.read_queue_tail);
 556                 }
 557                 spin_unlock(&pd->iosched.lock);
 558
 559                 if (!bio)
 560                         continue;
 561
 562                 if (bio_data_dir(bio) == READ)
 563                         pd->iosched.successive_reads += bio->bi_size >> 10;
 564                 else {
 565                         pd->iosched.successive_reads = 0;
 566                         pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
 567                 }
 568                 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
 569                         if (pd->read_speed == pd->write_speed) {
 570                                 pd->read_speed = MAX_SPEED;
 571                                 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
 572                         }
 573                 } else {
 574                         if (pd->read_speed != pd->write_speed) {
 575                                 pd->read_speed = pd->write_speed;
 576                                 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
 577                         }
 578                 }
 579
 580                 atomic_inc(&pd->cdrw.pending_bios);
 581                 generic_make_request(bio);
 582         }
 583 }
 584
 585 /*
 586  * Special care is needed if the underlying block device has a small
 587  * max_phys_segments value.
 588  */
 589 static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q)
 590 {
 591         if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
 592                 /*
 593                  * The cdrom device can handle one segment/frame
 594                  */
 595                 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
 596                 return 0;
 597         } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
 598                 /*
 599                  * We can handle this case at the expense of some extra memory
 600                  * copies during write operations
 601                  */
 602                 set_bit(PACKET_MERGE_SEGS, &pd->flags);
 603                 return 0;
 604         } else {
 605                 printk("pktcdvd: cdrom max_phys_segments too small\n");
 606                 return -EIO;
 607         }
 608 }
 609
 610 /*
 611  * Copy CD_FRAMESIZE bytes from src_bio into a destination page
 612  */
 613 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
 614 {
 615         unsigned int copy_size = CD_FRAMESIZE;
 616
 617         while (copy_size > 0) {
 618                 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
 619                 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
 620                         src_bvl->bv_offset + offs;
 621                 void *vto = page_address(dst_page) + dst_offs;
 622                 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
 623
 624                 BUG_ON(len < 0);
 625                 memcpy(vto, vfrom, len);
 626                 kunmap_atomic(vfrom, KM_USER0);
 627
 628                 seg++;
 629                 offs = 0;
 630                 dst_offs += len;
 631                 copy_size -= len;
 632         }
 633 }
 634
 635 /*
 636  * Copy all data for this packet to pkt->pages[], so that
 637  * a) The number of required segments for the write bio is minimized, which
 638  *    is necessary for some scsi controllers.
 639  * b) The data can be used as cache to avoid read requests if we receive a
 640  *    new write request for the same zone.
 641  */
 642 static void pkt_make_local_copy(struct packet_data *pkt, struct page **pages, int *offsets)
 643 {
 644         int f, p, offs;
 645
 646         /* Copy all data to pkt->pages[] */
 647         p = 0;
 648         offs = 0;
 649         for (f = 0; f < pkt->frames; f++) {
 650                 if (pages[f] != pkt->pages[p]) {
 651                         void *vfrom = kmap_atomic(pages[f], KM_USER0) + offsets[f];
 652                         void *vto = page_address(pkt->pages[p]) + offs;
 653                         memcpy(vto, vfrom, CD_FRAMESIZE);
 654                         kunmap_atomic(vfrom, KM_USER0);
 655                         pages[f] = pkt->pages[p];
 656                         offsets[f] = offs;
 657                 } else {
 658                         BUG_ON(offsets[f] != offs);
 659                 }
 660                 offs += CD_FRAMESIZE;
 661                 if (offs >= PAGE_SIZE) {
 662                         BUG_ON(offs > PAGE_SIZE);
 663                         offs = 0;
 664                         p++;
 665                 }
 666         }
 667 }
 668
 669 static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
 670 {
 671         struct packet_data *pkt = bio->bi_private;
 672         struct pktcdvd_device *pd = pkt->pd;
 673         BUG_ON(!pd);
 674
 675         if (bio->bi_size)
 676                 return 1;
 677
 678         VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
 679                 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
 680
 681         if (err)
 682                 atomic_inc(&pkt->io_errors);
 683         if (atomic_dec_and_test(&pkt->io_wait)) {
 684                 atomic_inc(&pkt->run_sm);
 685                 wake_up(&pd->wqueue);
 686         }
 687         pkt_bio_finished(pd);
 688
 689         return 0;
 690 }
 691
 692 static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
 693 {
 694         struct packet_data *pkt = bio->bi_private;
 695         struct pktcdvd_device *pd = pkt->pd;
 696         BUG_ON(!pd);
 697
 698         if (bio->bi_size)
 699                 return 1;
 700
 701         VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
 702
 703         pd->stats.pkt_ended++;
 704
 705         pkt_bio_finished(pd);
 706         atomic_dec(&pkt->io_wait);
 707         atomic_inc(&pkt->run_sm);
 708         wake_up(&pd->wqueue);
 709         return 0;
 710 }
 711
 712 /*
 713  * Schedule reads for the holes in a packet
 714  */
 715 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
 716 {
 717         int frames_read = 0;
 718         struct bio *bio;
 719         int f;
 720         char written[PACKET_MAX_SIZE];
 721
 722         BUG_ON(!pkt->orig_bios);
 723
 724         atomic_set(&pkt->io_wait, 0);
 725         atomic_set(&pkt->io_errors, 0);
 726
 727         if (pkt->cache_valid) {
 728                 VPRINTK("pkt_gather_data: zone %llx cached\n",
 729                         (unsigned long long)pkt->sector);
 730                 goto out_account;
 731         }
 732
 733         /*
 734          * Figure out which frames we need to read before we can write.
 735          */
 736         memset(written, 0, sizeof(written));
 737         spin_lock(&pkt->lock);
 738         for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
 739                 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
 740                 int num_frames = bio->bi_size / CD_FRAMESIZE;
 741                 BUG_ON(first_frame < 0);
 742                 BUG_ON(first_frame + num_frames > pkt->frames);
 743                 for (f = first_frame; f < first_frame + num_frames; f++)
 744                         written[f] = 1;
 745         }
 746         spin_unlock(&pkt->lock);
 747
 748         /*
 749          * Schedule reads for missing parts of the packet.
 750          */
 751         for (f = 0; f < pkt->frames; f++) {
 752                 int p, offset;
 753                 if (written[f])
 754                         continue;
 755                 bio = pkt->r_bios[f];
 756                 bio_init(bio);
 757                 bio->bi_max_vecs = 1;
 758                 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
 759                 bio->bi_bdev = pd->bdev;
 760                 bio->bi_end_io = pkt_end_io_read;
 761                 bio->bi_private = pkt;
 762
 763                 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
 764                 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
 765                 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
 766                         f, pkt->pages[p], offset);
 767                 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
 768                         BUG();
 769
 770                 atomic_inc(&pkt->io_wait);
 771                 bio->bi_rw = READ;
 772                 pkt_queue_bio(pd, bio);
 773                 frames_read++;
 774         }
 775
 776 out_account:
 777         VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
 778                 frames_read, (unsigned long long)pkt->sector);
 779         pd->stats.pkt_started++;
 780         pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
 781         pd->stats.secs_w += pd->settings.size;
 782 }
 783
 784 /*
 785  * Find a packet matching zone, or the least recently used packet if
 786  * there is no match.
 787  */
 788 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
 789 {
 790         struct packet_data *pkt;
 791
 792         list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
 793                 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
 794                         list_del_init(&pkt->list);
 795                         if (pkt->sector != zone)
 796                                 pkt->cache_valid = 0;
 797                         break;
 798                 }
 799         }
 800         return pkt;
 801 }
 802
 803 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
 804 {
 805         if (pkt->cache_valid) {
 806                 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
 807         } else {
 808                 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
 809         }
 810 }
 811
 812 /*
 813  * recover a failed write, query for relocation if possible
 814  *
 815  * returns 1 if recovery is possible, or 0 if not
 816  *
 817  */
 818 static int pkt_start_recovery(struct packet_data *pkt)
 819 {
 820         /*
 821          * FIXME. We need help from the file system to implement
 822          * recovery handling.
 823          */
 824         return 0;
 825 #if 0
 826         struct request *rq = pkt->rq;
 827         struct pktcdvd_device *pd = rq->rq_disk->private_data;
 828         struct block_device *pkt_bdev;
 829         struct super_block *sb = NULL;
 830         unsigned long old_block, new_block;
 831         sector_t new_sector;
 832
 833         pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
 834         if (pkt_bdev) {
 835                 sb = get_super(pkt_bdev);
 836                 bdput(pkt_bdev);
 837         }
 838
 839         if (!sb)
 840                 return 0;
 841
 842         if (!sb->s_op || !sb->s_op->relocate_blocks)
 843                 goto out;
 844
 845         old_block = pkt->sector / (CD_FRAMESIZE >> 9);
 846         if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
 847                 goto out;
 848
 849         new_sector = new_block * (CD_FRAMESIZE >> 9);
 850         pkt->sector = new_sector;
 851
 852         pkt->bio->bi_sector = new_sector;
 853         pkt->bio->bi_next = NULL;
 854         pkt->bio->bi_flags = 1 << BIO_UPTODATE;
 855         pkt->bio->bi_idx = 0;
 856
 857         BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
 858         BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
 859         BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
 860         BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
 861         BUG_ON(pkt->bio->bi_private != pkt);
 862
 863         drop_super(sb);
 864         return 1;
 865
 866 out:
 867         drop_super(sb);
 868         return 0;
 869 #endif
 870 }
 871
 872 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
 873 {
 874 #if PACKET_DEBUG > 1
 875         static const char *state_name[] = {
 876                 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
 877         };
 878         enum packet_data_state old_state = pkt->state;
 879         VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
 880                 state_name[old_state], state_name[state]);
 881 #endif
 882         pkt->state = state;
 883 }
 884
 885 /*
 886  * Scan the work queue to see if we can start a new packet.
 887  * returns non-zero if any work was done.
 888  */
 889 static int pkt_handle_queue(struct pktcdvd_device *pd)
 890 {
 891         struct packet_data *pkt, *p;
 892         struct bio *bio = NULL;
 893         sector_t zone = 0; /* Suppress gcc warning */
 894         struct pkt_rb_node *node, *first_node;
 895         struct rb_node *n;
 896
 897         VPRINTK("handle_queue\n");
 898
 899         atomic_set(&pd->scan_queue, 0);
 900
 901         if (list_empty(&pd->cdrw.pkt_free_list)) {
 902                 VPRINTK("handle_queue: no pkt\n");
 903                 return 0;
 904         }
 905
 906         /*
 907          * Try to find a zone we are not already working on.
 908          */
 909         spin_lock(&pd->lock);
 910         first_node = pkt_rbtree_find(pd, pd->current_sector);
 911         if (!first_node) {
 912                 n = rb_first(&pd->bio_queue);
 913                 if (n)
 914                         first_node = rb_entry(n, struct pkt_rb_node, rb_node);
 915         }
 916         node = first_node;
 917         while (node) {
 918                 bio = node->bio;
 919                 zone = ZONE(bio->bi_sector, pd);
 920                 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
 921                         if (p->sector == zone) {
 922                                 bio = NULL;
 923                                 goto try_next_bio;
 924                         }
 925                 }
 926                 break;
 927 try_next_bio:
 928                 node = pkt_rbtree_next(node);
 929                 if (!node) {
 930                         n = rb_first(&pd->bio_queue);
 931                         if (n)
 932                                 node = rb_entry(n, struct pkt_rb_node, rb_node);
 933                 }
 934                 if (node == first_node)
 935                         node = NULL;
 936         }
 937         spin_unlock(&pd->lock);
 938         if (!bio) {
 939                 VPRINTK("handle_queue: no bio\n");
 940                 return 0;
 941         }
 942
 943         pkt = pkt_get_packet_data(pd, zone);
 944         BUG_ON(!pkt);
 945
 946         pd->current_sector = zone + pd->settings.size;
 947         pkt->sector = zone;
 948         pkt->frames = pd->settings.size >> 2;
 949         pkt->write_size = 0;
 950
 951         /*
 952          * Scan work queue for bios in the same zone and link them
 953          * to this packet.
 954          */
 955         spin_lock(&pd->lock);
 956         VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
 957         while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
 958                 bio = node->bio;
 959                 VPRINTK("pkt_handle_queue: found zone=%llx\n",
 960                         (unsigned long long)ZONE(bio->bi_sector, pd));
 961                 if (ZONE(bio->bi_sector, pd) != zone)
 962                         break;
 963                 pkt_rbtree_erase(pd, node);
 964                 spin_lock(&pkt->lock);
 965                 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
 966                 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
 967                 spin_unlock(&pkt->lock);
 968         }
 969         spin_unlock(&pd->lock);
 970
 971         pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
 972         pkt_set_state(pkt, PACKET_WAITING_STATE);
 973         atomic_set(&pkt->run_sm, 1);
 974
 975         spin_lock(&pd->cdrw.active_list_lock);
 976         list_add(&pkt->list, &pd->cdrw.pkt_active_list);
 977         spin_unlock(&pd->cdrw.active_list_lock);
 978
 979         return 1;
 980 }
 981
 982 /*
 983  * Assemble a bio to write one packet and queue the bio for processing
 984  * by the underlying block device.
 985  */
 986 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
 987 {
 988         struct bio *bio;
 989         struct page *pages[PACKET_MAX_SIZE];
 990         int offsets[PACKET_MAX_SIZE];
 991         int f;
 992         int frames_write;
 993
 994         for (f = 0; f < pkt->frames; f++) {
 995                 pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
 996                 offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE;
 997         }
 998
 999         /*
1000          * Fill-in pages[] and offsets[] with data from orig_bios.
1001          */
1002         frames_write = 0;
1003         spin_lock(&pkt->lock);
1004         for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1005                 int segment = bio->bi_idx;
1006                 int src_offs = 0;
1007                 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1008                 int num_frames = bio->bi_size / CD_FRAMESIZE;
1009                 BUG_ON(first_frame < 0);
1010                 BUG_ON(first_frame + num_frames > pkt->frames);
1011                 for (f = first_frame; f < first_frame + num_frames; f++) {
1012                         struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1013
1014                         while (src_offs >= src_bvl->bv_len) {
1015                                 src_offs -= src_bvl->bv_len;
1016                                 segment++;
1017                                 BUG_ON(segment >= bio->bi_vcnt);
1018                                 src_bvl = bio_iovec_idx(bio, segment);
1019                         }
1020
1021                         if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1022                                 pages[f] = src_bvl->bv_page;
1023                                 offsets[f] = src_bvl->bv_offset + src_offs;
1024                         } else {
1025                                 pkt_copy_bio_data(bio, segment, src_offs,
1026                                                   pages[f], offsets[f]);
1027                         }
1028                         src_offs += CD_FRAMESIZE;
1029                         frames_write++;
1030                 }
1031         }
1032         pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1033         spin_unlock(&pkt->lock);
1034
1035         VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1036                 frames_write, (unsigned long long)pkt->sector);
1037         BUG_ON(frames_write != pkt->write_size);
1038
1039         if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1040                 pkt_make_local_copy(pkt, pages, offsets);
1041                 pkt->cache_valid = 1;
1042         } else {
1043                 pkt->cache_valid = 0;
1044         }
1045
1046         /* Start the write request */
1047         bio_init(pkt->w_bio);
1048         pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1049         pkt->w_bio->bi_sector = pkt->sector;
1050         pkt->w_bio->bi_bdev = pd->bdev;
1051         pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1052         pkt->w_bio->bi_private = pkt;
1053         for (f = 0; f < pkt->frames; f++) {
1054                 if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) &&
1055                     (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) {
1056                         if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f]))
1057                                 BUG();
1058                         f++;
1059                 } else {
1060                         if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f]))
1061                                 BUG();
1062                 }
1063         }
1064         VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt);
1065
1066         atomic_set(&pkt->io_wait, 1);
1067         pkt->w_bio->bi_rw = WRITE;
1068         pkt_queue_bio(pd, pkt->w_bio);
1069 }
1070
1071 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1072 {
1073         struct bio *bio, *next;
1074
1075         if (!uptodate)
1076                 pkt->cache_valid = 0;
1077
1078         /* Finish all bios corresponding to this packet */
1079         bio = pkt->orig_bios;
1080         while (bio) {
1081                 next = bio->bi_next;
1082                 bio->bi_next = NULL;
1083                 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1084                 bio = next;
1085         }
1086         pkt->orig_bios = pkt->orig_bios_tail = NULL;
1087 }
1088
1089 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1090 {
1091         int uptodate;
1092
1093         VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1094
1095         for (;;) {
1096                 switch (pkt->state) {
1097                 case PACKET_WAITING_STATE:
1098                         if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1099                                 return;
1100
1101                         pkt->sleep_time = 0;
1102                         pkt_gather_data(pd, pkt);
1103                         pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1104                         break;
1105
1106                 case PACKET_READ_WAIT_STATE:
1107                         if (atomic_read(&pkt->io_wait) > 0)
1108                                 return;
1109
1110                         if (atomic_read(&pkt->io_errors) > 0) {
1111                                 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1112                         } else {
1113                                 pkt_start_write(pd, pkt);
1114                         }
1115                         break;
1116
1117                 case PACKET_WRITE_WAIT_STATE:
1118                         if (atomic_read(&pkt->io_wait) > 0)
1119                                 return;
1120
1121                         if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1122                                 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1123                         } else {
1124                                 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1125                         }
1126                         break;
1127
1128                 case PACKET_RECOVERY_STATE:
1129                         if (pkt_start_recovery(pkt)) {
1130                                 pkt_start_write(pd, pkt);
1131                         } else {
1132                                 VPRINTK("No recovery possible\n");
1133                                 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1134                         }
1135                         break;
1136
1137                 case PACKET_FINISHED_STATE:
1138                         uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1139                         pkt_finish_packet(pkt, uptodate);
1140                         return;
1141
1142                 default:
1143                         BUG();
1144                         break;
1145                 }
1146         }
1147 }
1148
1149 static void pkt_handle_packets(struct pktcdvd_device *pd)
1150 {
1151         struct packet_data *pkt, *next;
1152
1153         VPRINTK("pkt_handle_packets\n");
1154
1155         /*
1156          * Run state machine for active packets
1157          */
1158         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1159                 if (atomic_read(&pkt->run_sm) > 0) {
1160                         atomic_set(&pkt->run_sm, 0);
1161                         pkt_run_state_machine(pd, pkt);
1162                 }
1163         }
1164
1165         /*
1166          * Move no longer active packets to the free list
1167          */
1168         spin_lock(&pd->cdrw.active_list_lock);
1169         list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1170                 if (pkt->state == PACKET_FINISHED_STATE) {
1171                         list_del(&pkt->list);
1172                         pkt_put_packet_data(pd, pkt);
1173                         pkt_set_state(pkt, PACKET_IDLE_STATE);
1174                         atomic_set(&pd->scan_queue, 1);
1175                 }
1176         }
1177         spin_unlock(&pd->cdrw.active_list_lock);
1178 }
1179
1180 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1181 {
1182         struct packet_data *pkt;
1183         int i;
1184
1185         for (i = 0; i <= PACKET_NUM_STATES; i++)
1186                 states[i] = 0;
1187
1188         spin_lock(&pd->cdrw.active_list_lock);
1189         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1190                 states[pkt->state]++;
1191         }
1192         spin_unlock(&pd->cdrw.active_list_lock);
1193 }
1194
1195 /*
1196  * kcdrwd is woken up when writes have been queued for one of our
1197  * registered devices
1198  */
1199 static int kcdrwd(void *foobar)
1200 {
1201         struct pktcdvd_device *pd = foobar;
1202         struct packet_data *pkt;
1203         long min_sleep_time, residue;
1204
1205         set_user_nice(current, -20);
1206
1207         for (;;) {
1208                 DECLARE_WAITQUEUE(wait, current);
1209
1210                 /*
1211                  * Wait until there is something to do
1212                  */
1213                 add_wait_queue(&pd->wqueue, &wait);
1214                 for (;;) {
1215                         set_current_state(TASK_INTERRUPTIBLE);
1216
1217                         /* Check if we need to run pkt_handle_queue */
1218                         if (atomic_read(&pd->scan_queue) > 0)
1219                                 goto work_to_do;
1220
1221                         /* Check if we need to run the state machine for some packet */
1222                         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1223                                 if (atomic_read(&pkt->run_sm) > 0)
1224                                         goto work_to_do;
1225                         }
1226
1227                         /* Check if we need to process the iosched queues */
1228                         if (atomic_read(&pd->iosched.attention) != 0)
1229                                 goto work_to_do;
1230
1231                         /* Otherwise, go to sleep */
1232                         if (PACKET_DEBUG > 1) {
1233                                 int states[PACKET_NUM_STATES];
1234                                 pkt_count_states(pd, states);
1235                                 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1236                                         states[0], states[1], states[2], states[3],
1237                                         states[4], states[5]);
1238                         }
1239
1240                         min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1241                         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1242                                 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1243                                         min_sleep_time = pkt->sleep_time;
1244                         }
1245
1246                         generic_unplug_device(bdev_get_queue(pd->bdev));
1247
1248                         VPRINTK("kcdrwd: sleeping\n");
1249                         residue = schedule_timeout(min_sleep_time);
1250                         VPRINTK("kcdrwd: wake up\n");
1251
1252                         /* make swsusp happy with our thread */
1253                         try_to_freeze();
1254
1255                         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1256                                 if (!pkt->sleep_time)
1257                                         continue;
1258                                 pkt->sleep_time -= min_sleep_time - residue;
1259                                 if (pkt->sleep_time <= 0) {
1260                                         pkt->sleep_time = 0;
1261                                         atomic_inc(&pkt->run_sm);
1262                                 }
1263                         }
1264
1265                         if (signal_pending(current)) {
1266                                 flush_signals(current);
1267                         }
1268                         if (kthread_should_stop())
1269                                 break;
1270                 }
1271 work_to_do:
1272                 set_current_state(TASK_RUNNING);
1273                 remove_wait_queue(&pd->wqueue, &wait);
1274
1275                 if (kthread_should_stop())
1276                         break;
1277
1278                 /*
1279                  * if pkt_handle_queue returns true, we can queue
1280                  * another request.
1281                  */
1282                 while (pkt_handle_queue(pd))
1283                         ;
1284
1285                 /*
1286                  * Handle packet state machine
1287                  */
1288                 pkt_handle_packets(pd);
1289
1290                 /*
1291                  * Handle iosched queues
1292                  */
1293                 pkt_iosched_process_queue(pd);
1294         }
1295
1296         return 0;
1297 }
1298
1299 static void pkt_print_settings(struct pktcdvd_device *pd)
1300 {
1301         printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1302         printk("%u blocks, ", pd->settings.size >> 2);
1303         printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1304 }
1305
1306 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1307 {
1308         memset(cgc->cmd, 0, sizeof(cgc->cmd));
1309
1310         cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1311         cgc->cmd[2] = page_code | (page_control << 6);
1312         cgc->cmd[7] = cgc->buflen >> 8;
1313         cgc->cmd[8] = cgc->buflen & 0xff;
1314         cgc->data_direction = CGC_DATA_READ;
1315         return pkt_generic_packet(pd, cgc);
1316 }
1317
1318 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1319 {
1320         memset(cgc->cmd, 0, sizeof(cgc->cmd));
1321         memset(cgc->buffer, 0, 2);
1322         cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1323         cgc->cmd[1] = 0x10;             /* PF */
1324         cgc->cmd[7] = cgc->buflen >> 8;
1325         cgc->cmd[8] = cgc->buflen & 0xff;
1326         cgc->data_direction = CGC_DATA_WRITE;
1327         return pkt_generic_packet(pd, cgc);
1328 }
1329
1330 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1331 {
1332         struct packet_command cgc;
1333         int ret;
1334
1335         /* set up command and get the disc info */
1336         init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1337         cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1338         cgc.cmd[8] = cgc.buflen = 2;
1339         cgc.quiet = 1;
1340
1341         if ((ret = pkt_generic_packet(pd, &cgc)))
1342                 return ret;
1343
1344         /* not all drives have the same disc_info length, so requeue
1345          * packet with the length the drive tells us it can supply
1346          */
1347         cgc.buflen = be16_to_cpu(di->disc_information_length) +
1348                      sizeof(di->disc_information_length);
1349
1350         if (cgc.buflen > sizeof(disc_information))
1351                 cgc.buflen = sizeof(disc_information);
1352
1353         cgc.cmd[8] = cgc.buflen;
1354         return pkt_generic_packet(pd, &cgc);
1355 }
1356
1357 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1358 {
1359         struct packet_command cgc;
1360         int ret;
1361
1362         init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1363         cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1364         cgc.cmd[1] = type & 3;
1365         cgc.cmd[4] = (track & 0xff00) >> 8;
1366         cgc.cmd[5] = track & 0xff;
1367         cgc.cmd[8] = 8;
1368         cgc.quiet = 1;
1369
1370         if ((ret = pkt_generic_packet(pd, &cgc)))
1371                 return ret;
1372
1373         cgc.buflen = be16_to_cpu(ti->track_information_length) +
1374                      sizeof(ti->track_information_length);
1375
1376         if (cgc.buflen > sizeof(track_information))
1377                 cgc.buflen = sizeof(track_information);
1378
1379         cgc.cmd[8] = cgc.buflen;
1380         return pkt_generic_packet(pd, &cgc);
1381 }
1382
1383 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1384 {
1385         disc_information di;
1386         track_information ti;
1387         __u32 last_track;
1388         int ret = -1;
1389
1390         if ((ret = pkt_get_disc_info(pd, &di)))
1391                 return ret;
1392
1393         last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1394         if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1395                 return ret;
1396
1397         /* if this track is blank, try the previous. */
1398         if (ti.blank) {
1399                 last_track--;
1400                 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1401                         return ret;
1402         }
1403
1404         /* if last recorded field is valid, return it. */
1405         if (ti.lra_v) {
1406                 *last_written = be32_to_cpu(ti.last_rec_address);
1407         } else {
1408                 /* make it up instead */
1409                 *last_written = be32_to_cpu(ti.track_start) +
1410                                 be32_to_cpu(ti.track_size);
1411                 if (ti.free_blocks)
1412                         *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1413         }
1414         return 0;
1415 }
1416
1417 /*
1418  * write mode select package based on pd->settings
1419  */
1420 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1421 {
1422         struct packet_command cgc;
1423         struct request_sense sense;
1424         write_param_page *wp;
1425         char buffer[128];
1426         int ret, size;
1427
1428         /* doesn't apply to DVD+RW or DVD-RAM */
1429         if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1430                 return 0;
1431
1432         memset(buffer, 0, sizeof(buffer));
1433         init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1434         cgc.sense = &sense;
1435         if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1436                 pkt_dump_sense(&cgc);
1437                 return ret;
1438         }
1439
1440         size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1441         pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1442         if (size > sizeof(buffer))
1443                 size = sizeof(buffer);
1444
1445         /*
1446          * now get it all
1447          */
1448         init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1449         cgc.sense = &sense;
1450         if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1451                 pkt_dump_sense(&cgc);
1452                 return ret;
1453         }
1454
1455         /*
1456          * write page is offset header + block descriptor length
1457          */
1458         wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1459
1460         wp->fp = pd->settings.fp;
1461         wp->track_mode = pd->settings.track_mode;
1462         wp->write_type = pd->settings.write_type;
1463         wp->data_block_type = pd->settings.block_mode;
1464
1465         wp->multi_session = 0;
1466
1467 #ifdef PACKET_USE_LS
1468         wp->link_size = 7;
1469         wp->ls_v = 1;
1470 #endif
1471
1472         if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1473                 wp->session_format = 0;
1474                 wp->subhdr2 = 0x20;
1475         } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1476                 wp->session_format = 0x20;
1477                 wp->subhdr2 = 8;
1478 #if 0
1479                 wp->mcn[0] = 0x80;
1480                 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1481 #endif
1482         } else {
1483                 /*
1484                  * paranoia
1485                  */
1486                 printk("pktcdvd: write mode wrong %d\n", wp->data_block_type);
1487                 return 1;
1488         }
1489         wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1490
1491         cgc.buflen = cgc.cmd[8] = size;
1492         if ((ret = pkt_mode_select(pd, &cgc))) {
1493                 pkt_dump_sense(&cgc);
1494                 return ret;
1495         }
1496
1497         pkt_print_settings(pd);
1498         return 0;
1499 }
1500
1501 /*
1502  * 0 -- we can write to this track, 1 -- we can't
1503  */
1504 static int pkt_good_track(track_information *ti)
1505 {
1506         /*
1507          * only good for CD-RW at the moment, not DVD-RW
1508          */
1509
1510         /*
1511          * FIXME: only for FP
1512          */
1513         if (ti->fp == 0)
1514                 return 0;
1515
1516         /*
1517          * "good" settings as per Mt Fuji.
1518          */
1519         if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1)
1520                 return 0;
1521
1522         if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1)
1523                 return 0;
1524
1525         if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1)
1526                 return 0;
1527
1528         printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1529         return 1;
1530 }
1531
1532 /*
1533  * 0 -- we can write to this disc, 1 -- we can't
1534  */
1535 static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
1536 {
1537         switch (pd->mmc3_profile) {
1538                 case 0x0a: /* CD-RW */
1539                 case 0xffff: /* MMC3 not supported */
1540                         break;
1541                 case 0x1a: /* DVD+RW */
1542                 case 0x13: /* DVD-RW */
1543                 case 0x12: /* DVD-RAM */
1544                         return 0;
1545                 default:
1546                         printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
1547                         return 1;
1548         }
1549
1550         /*
1551          * for disc type 0xff we should probably reserve a new track.
1552          * but i'm not sure, should we leave this to user apps? probably.
1553          */
1554         if (di->disc_type == 0xff) {
1555                 printk("pktcdvd: Unknown disc. No track?\n");
1556                 return 1;
1557         }
1558
1559         if (di->disc_type != 0x20 && di->disc_type != 0) {
1560                 printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type);
1561                 return 1;
1562         }
1563
1564         if (di->erasable == 0) {
1565                 printk("pktcdvd: Disc not erasable\n");
1566                 return 1;
1567         }
1568
1569         if (di->border_status == PACKET_SESSION_RESERVED) {
1570                 printk("pktcdvd: Can't write to last track (reserved)\n");
1571                 return 1;
1572         }
1573
1574         return 0;
1575 }
1576
1577 static int pkt_probe_settings(struct pktcdvd_device *pd)
1578 {
1579         struct packet_command cgc;
1580         unsigned char buf[12];
1581         disc_information di;
1582         track_information ti;
1583         int ret, track;
1584
1585         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1586         cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1587         cgc.cmd[8] = 8;
1588         ret = pkt_generic_packet(pd, &cgc);
1589         pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1590
1591         memset(&di, 0, sizeof(disc_information));
1592         memset(&ti, 0, sizeof(track_information));
1593
1594         if ((ret = pkt_get_disc_info(pd, &di))) {
1595                 printk("failed get_disc\n");
1596                 return ret;
1597         }
1598
1599         if (pkt_good_disc(pd, &di))
1600                 return -ENXIO;
1601
1602         switch (pd->mmc3_profile) {
1603                 case 0x1a: /* DVD+RW */
1604                         printk("pktcdvd: inserted media is DVD+RW\n");
1605                         break;
1606                 case 0x13: /* DVD-RW */
1607                         printk("pktcdvd: inserted media is DVD-RW\n");
1608                         break;
1609                 case 0x12: /* DVD-RAM */
1610                         printk("pktcdvd: inserted media is DVD-RAM\n");
1611                         break;
1612                 default:
1613                         printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
1614                         break;
1615         }
1616         pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1617
1618         track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1619         if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1620                 printk("pktcdvd: failed get_track\n");
1621                 return ret;
1622         }
1623
1624         if (pkt_good_track(&ti)) {
1625                 printk("pktcdvd: can't write to this track\n");
1626                 return -ENXIO;
1627         }
1628
1629         /*
1630          * we keep packet size in 512 byte units, makes it easier to
1631          * deal with request calculations.
1632          */
1633         pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1634         if (pd->settings.size == 0) {
1635                 printk("pktcdvd: detected zero packet size!\n");
1636                 pd->settings.size = 128;
1637         }
1638         if (pd->settings.size > PACKET_MAX_SECTORS) {
1639                 printk("pktcdvd: packet size is too big\n");
1640                 return -ENXIO;
1641         }
1642         pd->settings.fp = ti.fp;
1643         pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1644
1645         if (ti.nwa_v) {
1646                 pd->nwa = be32_to_cpu(ti.next_writable);
1647                 set_bit(PACKET_NWA_VALID, &pd->flags);
1648         }
1649
1650         /*
1651          * in theory we could use lra on -RW media as well and just zero
1652          * blocks that haven't been written yet, but in practice that
1653          * is just a no-go. we'll use that for -R, naturally.
1654          */
1655         if (ti.lra_v) {
1656                 pd->lra = be32_to_cpu(ti.last_rec_address);
1657                 set_bit(PACKET_LRA_VALID, &pd->flags);
1658         } else {
1659                 pd->lra = 0xffffffff;
1660                 set_bit(PACKET_LRA_VALID, &pd->flags);
1661         }
1662
1663         /*
1664          * fine for now
1665          */
1666         pd->settings.link_loss = 7;
1667         pd->settings.write_type = 0;    /* packet */
1668         pd->settings.track_mode = ti.track_mode;
1669
1670         /*
1671          * mode1 or mode2 disc
1672          */
1673         switch (ti.data_mode) {
1674                 case PACKET_MODE1:
1675                         pd->settings.block_mode = PACKET_BLOCK_MODE1;
1676                         break;
1677                 case PACKET_MODE2:
1678                         pd->settings.block_mode = PACKET_BLOCK_MODE2;
1679                         break;
1680                 default:
1681                         printk("pktcdvd: unknown data mode\n");
1682                         return 1;
1683         }
1684         return 0;
1685 }
1686
1687 /*
1688  * enable/disable write caching on drive
1689  */
1690 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
1691 {
1692         struct packet_command cgc;
1693         struct request_sense sense;
1694         unsigned char buf[64];
1695         int ret;
1696
1697         memset(buf, 0, sizeof(buf));
1698         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1699         cgc.sense = &sense;
1700         cgc.buflen = pd->mode_offset + 12;
1701
1702         /*
1703          * caching mode page might not be there, so quiet this command
1704          */
1705         cgc.quiet = 1;
1706
1707         if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1708                 return ret;
1709
1710         buf[pd->mode_offset + 10] |= (!!set << 2);
1711
1712         cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1713         ret = pkt_mode_select(pd, &cgc);
1714         if (ret) {
1715                 printk("pktcdvd: write caching control failed\n");
1716                 pkt_dump_sense(&cgc);
1717         } else if (!ret && set)
1718                 printk("pktcdvd: enabled write caching on %s\n", pd->name);
1719         return ret;
1720 }
1721
1722 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1723 {
1724         struct packet_command cgc;
1725
1726         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1727         cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1728         cgc.cmd[4] = lockflag ? 1 : 0;
1729         return pkt_generic_packet(pd, &cgc);
1730 }
1731
1732 /*
1733  * Returns drive maximum write speed
1734  */
1735 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
1736 {
1737         struct packet_command cgc;
1738         struct request_sense sense;
1739         unsigned char buf[256+18];
1740         unsigned char *cap_buf;
1741         int ret, offset;
1742
1743         memset(buf, 0, sizeof(buf));
1744         cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1745         init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1746         cgc.sense = &sense;
1747
1748         ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1749         if (ret) {
1750                 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1751                              sizeof(struct mode_page_header);
1752                 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1753                 if (ret) {
1754                         pkt_dump_sense(&cgc);
1755                         return ret;
1756                 }
1757         }
1758
1759         offset = 20;                        /* Obsoleted field, used by older drives */
1760         if (cap_buf[1] >= 28)
1761                 offset = 28;                /* Current write speed selected */
1762         if (cap_buf[1] >= 30) {
1763                 /* If the drive reports at least one "Logical Unit Write
1764                  * Speed Performance Descriptor Block", use the information
1765                  * in the first block. (contains the highest speed)
1766                  */
1767                 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1768                 if (num_spdb > 0)
1769                         offset = 34;
1770         }
1771
1772         *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1773         return 0;
1774 }
1775
1776 /* These tables from cdrecord - I don't have orange book */
1777 /* standard speed CD-RW (1-4x) */
1778 static char clv_to_speed[16] = {
1779         /* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
1780            0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1781 };
1782 /* high speed CD-RW (-10x) */
1783 static char hs_clv_to_speed[16] = {
1784         /* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
1785            0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1786 };
1787 /* ultra high speed CD-RW */
1788 static char us_clv_to_speed[16] = {
1789         /* 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 */
1790            0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1791 };
1792
1793 /*
1794  * reads the maximum media speed from ATIP
1795  */
1796 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
1797 {
1798         struct packet_command cgc;
1799         struct request_sense sense;
1800         unsigned char buf[64];
1801         unsigned int size, st, sp;
1802         int ret;
1803
1804         init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
1805         cgc.sense = &sense;
1806         cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1807         cgc.cmd[1] = 2;
1808         cgc.cmd[2] = 4; /* READ ATIP */
1809         cgc.cmd[8] = 2;
1810         ret = pkt_generic_packet(pd, &cgc);
1811         if (ret) {
1812                 pkt_dump_sense(&cgc);
1813                 return ret;
1814         }
1815         size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
1816         if (size > sizeof(buf))
1817                 size = sizeof(buf);
1818
1819         init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1820         cgc.sense = &sense;
1821         cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1822         cgc.cmd[1] = 2;
1823         cgc.cmd[2] = 4;
1824         cgc.cmd[8] = size;
1825         ret = pkt_generic_packet(pd, &cgc);
1826         if (ret) {
1827                 pkt_dump_sense(&cgc);
1828                 return ret;
1829         }
1830
1831         if (!buf[6] & 0x40) {
1832                 printk("pktcdvd: Disc type is not CD-RW\n");
1833                 return 1;
1834         }
1835         if (!buf[6] & 0x4) {
1836                 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1837                 return 1;
1838         }
1839
1840         st = (buf[6] >> 3) & 0x7; /* disc sub-type */
1841
1842         sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
1843
1844         /* Info from cdrecord */
1845         switch (st) {
1846                 case 0: /* standard speed */
1847                         *speed = clv_to_speed[sp];
1848                         break;
1849                 case 1: /* high speed */
1850                         *speed = hs_clv_to_speed[sp];
1851                         break;
1852                 case 2: /* ultra high speed */
1853                         *speed = us_clv_to_speed[sp];
1854                         break;
1855                 default:
1856                         printk("pktcdvd: Unknown disc sub-type %d\n",st);
1857                         return 1;
1858         }
1859         if (*speed) {
1860                 printk("pktcdvd: Max. media speed: %d\n",*speed);
1861                 return 0;
1862         } else {
1863                 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st);
1864                 return 1;
1865         }
1866 }
1867
1868 static int pkt_perform_opc(struct pktcdvd_device *pd)
1869 {
1870         struct packet_command cgc;
1871         struct request_sense sense;
1872         int ret;
1873
1874         VPRINTK("pktcdvd: Performing OPC\n");
1875
1876         init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1877         cgc.sense = &sense;
1878         cgc.timeout = 60*HZ;
1879         cgc.cmd[0] = GPCMD_SEND_OPC;
1880         cgc.cmd[1] = 1;
1881         if ((ret = pkt_generic_packet(pd, &cgc)))
1882                 pkt_dump_sense(&cgc);
1883         return ret;
1884 }
1885
1886 static int pkt_open_write(struct pktcdvd_device *pd)
1887 {
1888         int ret;
1889         unsigned int write_speed, media_write_speed, read_speed;
1890
1891         if ((ret = pkt_probe_settings(pd))) {
1892                 DPRINTK("pktcdvd: %s failed probe\n", pd->name);
1893                 return -EIO;
1894         }
1895
1896         if ((ret = pkt_set_write_settings(pd))) {
1897                 DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name);
1898                 return -EIO;
1899         }
1900
1901         pkt_write_caching(pd, USE_WCACHING);
1902
1903         if ((ret = pkt_get_max_speed(pd, &write_speed)))
1904                 write_speed = 16 * 177;
1905         switch (pd->mmc3_profile) {
1906                 case 0x13: /* DVD-RW */
1907                 case 0x1a: /* DVD+RW */
1908                 case 0x12: /* DVD-RAM */
1909                         DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
1910                         break;
1911                 default:
1912                         if ((ret = pkt_media_speed(pd, &media_write_speed)))
1913                                 media_write_speed = 16;
1914                         write_speed = min(write_speed, media_write_speed * 177);
1915                         DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
1916                         break;
1917         }
1918         read_speed = write_speed;
1919
1920         if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
1921                 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
1922                 return -EIO;
1923         }
1924         pd->write_speed = write_speed;
1925         pd->read_speed = read_speed;
1926
1927         if ((ret = pkt_perform_opc(pd))) {
1928                 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name);
1929         }
1930
1931         return 0;
1932 }
1933
1934 /*
1935  * called at open time.
1936  */
1937 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
1938 {
1939         int ret;
1940         long lba;
1941         request_queue_t *q;
1942
1943         /*
1944          * We need to re-open the cdrom device without O_NONBLOCK to be able
1945          * to read/write from/to it. It is already opened in O_NONBLOCK mode
1946          * so bdget() can't fail.
1947          */
1948         bdget(pd->bdev->bd_dev);
1949         if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
1950                 goto out;
1951
1952         if ((ret = pkt_get_last_written(pd, &lba))) {
1953                 printk("pktcdvd: pkt_get_last_written failed\n");
1954                 goto out_putdev;
1955         }
1956
1957         set_capacity(pd->disk, lba << 2);
1958         set_capacity(pd->bdev->bd_disk, lba << 2);
1959         bd_set_size(pd->bdev, (loff_t)lba << 11);
1960
1961         q = bdev_get_queue(pd->bdev);
1962         if (write) {
1963                 if ((ret = pkt_open_write(pd)))
1964                         goto out_putdev;
1965                 /*
1966                  * Some CDRW drives can not handle writes larger than one packet,
1967                  * even if the size is a multiple of the packet size.
1968                  */
1969                 spin_lock_irq(q->queue_lock);
1970                 blk_queue_max_sectors(q, pd->settings.size);
1971                 spin_unlock_irq(q->queue_lock);
1972                 set_bit(PACKET_WRITABLE, &pd->flags);
1973         } else {
1974                 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1975                 clear_bit(PACKET_WRITABLE, &pd->flags);
1976         }
1977
1978         if ((ret = pkt_set_segment_merging(pd, q)))
1979                 goto out_putdev;
1980
1981         if (write)
1982                 printk("pktcdvd: %lukB available on disc\n", lba << 1);
1983
1984         return 0;
1985
1986 out_putdev:
1987         blkdev_put(pd->bdev);
1988 out:
1989         return ret;
1990 }
1991
1992 /*
1993  * called when the device is closed. makes sure that the device flushes
1994  * the internal cache before we close.
1995  */
1996 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
1997 {
1998         if (flush && pkt_flush_cache(pd))
1999                 DPRINTK("pktcdvd: %s not flushing cache\n", pd->name);
2000
2001         pkt_lock_door(pd, 0);
2002
2003         pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2004         blkdev_put(pd->bdev);
2005 }
2006
2007 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2008 {
2009         if (dev_minor >= MAX_WRITERS)
2010                 return NULL;
2011         return pkt_devs[dev_minor];
2012 }
2013
2014 static int pkt_open(struct inode *inode, struct file *file)
2015 {
2016         struct pktcdvd_device *pd = NULL;
2017         int ret;
2018
2019         VPRINTK("pktcdvd: entering open\n");
2020
2021         down(&ctl_mutex);
2022         pd = pkt_find_dev_from_minor(iminor(inode));
2023         if (!pd) {
2024                 ret = -ENODEV;
2025                 goto out;
2026         }
2027         BUG_ON(pd->refcnt < 0);
2028
2029         pd->refcnt++;
2030         if (pd->refcnt > 1) {
2031                 if ((file->f_mode & FMODE_WRITE) &&
2032                     !test_bit(PACKET_WRITABLE, &pd->flags)) {
2033                         ret = -EBUSY;
2034                         goto out_dec;
2035                 }
2036         } else {
2037                 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2038                         ret = -EIO;
2039                         goto out_dec;
2040                 }
2041                 /*
2042                  * needed here as well, since ext2 (among others) may change
2043                  * the blocksize at mount time
2044                  */
2045                 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2046         }
2047
2048         up(&ctl_mutex);
2049         return 0;
2050
2051 out_dec:
2052         pd->refcnt--;
2053 out:
2054         VPRINTK("pktcdvd: failed open (%d)\n", ret);
2055         up(&ctl_mutex);
2056         return ret;
2057 }
2058
2059 static int pkt_close(struct inode *inode, struct file *file)
2060 {
2061         struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2062         int ret = 0;
2063
2064         down(&ctl_mutex);
2065         pd->refcnt--;
2066         BUG_ON(pd->refcnt < 0);
2067         if (pd->refcnt == 0) {
2068                 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2069                 pkt_release_dev(pd, flush);
2070         }
2071         up(&ctl_mutex);
2072         return ret;
2073 }
2074
2075
2076 static void *psd_pool_alloc(unsigned int __nocast gfp_mask, void *data)
2077 {
2078         return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2079 }
2080
2081 static void psd_pool_free(void *ptr, void *data)
2082 {
2083         kfree(ptr);
2084 }
2085
2086 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2087 {
2088         struct packet_stacked_data *psd = bio->bi_private;
2089         struct pktcdvd_device *pd = psd->pd;
2090
2091         if (bio->bi_size)
2092                 return 1;
2093
2094         bio_put(bio);
2095         bio_endio(psd->bio, psd->bio->bi_size, err);
2096         mempool_free(psd, psd_pool);
2097         pkt_bio_finished(pd);
2098         return 0;
2099 }
2100
2101 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2102 {
2103         struct pktcdvd_device *pd;
2104         char b[BDEVNAME_SIZE];
2105         sector_t zone;
2106         struct packet_data *pkt;
2107         int was_empty, blocked_bio;
2108         struct pkt_rb_node *node;
2109
2110         pd = q->queuedata;
2111         if (!pd) {
2112                 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2113                 goto end_io;
2114         }
2115
2116         /*
2117          * Clone READ bios so we can have our own bi_end_io callback.
2118          */
2119         if (bio_data_dir(bio) == READ) {
2120                 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2121                 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2122
2123                 psd->pd = pd;
2124                 psd->bio = bio;
2125                 cloned_bio->bi_bdev = pd->bdev;
2126                 cloned_bio->bi_private = psd;
2127                 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2128                 pd->stats.secs_r += bio->bi_size >> 9;
2129                 pkt_queue_bio(pd, cloned_bio);
2130                 return 0;
2131         }
2132
2133         if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2134                 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2135                         pd->name, (unsigned long long)bio->bi_sector);
2136                 goto end_io;
2137         }
2138
2139         if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2140                 printk("pktcdvd: wrong bio size\n");
2141                 goto end_io;
2142         }
2143
2144         blk_queue_bounce(q, &bio);
2145
2146         zone = ZONE(bio->bi_sector, pd);
2147         VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2148                 (unsigned long long)bio->bi_sector,
2149                 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2150
2151         /* Check if we have to split the bio */
2152         {
2153                 struct bio_pair *bp;
2154                 sector_t last_zone;
2155                 int first_sectors;
2156
2157                 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2158                 if (last_zone != zone) {
2159                         BUG_ON(last_zone != zone + pd->settings.size);
2160                         first_sectors = last_zone - bio->bi_sector;
2161                         bp = bio_split(bio, bio_split_pool, first_sectors);
2162                         BUG_ON(!bp);
2163                         pkt_make_request(q, &bp->bio1);
2164                         pkt_make_request(q, &bp->bio2);
2165                         bio_pair_release(bp);
2166                         return 0;
2167                 }
2168         }
2169
2170         /*
2171          * If we find a matching packet in state WAITING or READ_WAIT, we can
2172          * just append this bio to that packet.
2173          */
2174         spin_lock(&pd->cdrw.active_list_lock);
2175         blocked_bio = 0;
2176         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2177                 if (pkt->sector == zone) {
2178                         spin_lock(&pkt->lock);
2179                         if ((pkt->state == PACKET_WAITING_STATE) ||
2180                             (pkt->state == PACKET_READ_WAIT_STATE)) {
2181                                 pkt_add_list_last(bio, &pkt->orig_bios,
2182                                                   &pkt->orig_bios_tail);
2183                                 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2184                                 if ((pkt->write_size >= pkt->frames) &&
2185                                     (pkt->state == PACKET_WAITING_STATE)) {
2186                                         atomic_inc(&pkt->run_sm);
2187                                         wake_up(&pd->wqueue);
2188                                 }
2189                                 spin_unlock(&pkt->lock);
2190                                 spin_unlock(&pd->cdrw.active_list_lock);
2191                                 return 0;
2192                         } else {
2193                                 blocked_bio = 1;
2194                         }
2195                         spin_unlock(&pkt->lock);
2196                 }
2197         }
2198         spin_unlock(&pd->cdrw.active_list_lock);
2199
2200         /*
2201          * No matching packet found. Store the bio in the work queue.
2202          */
2203         node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2204         BUG_ON(!node);
2205         node->bio = bio;
2206         spin_lock(&pd->lock);
2207         BUG_ON(pd->bio_queue_size < 0);
2208         was_empty = (pd->bio_queue_size == 0);
2209         pkt_rbtree_insert(pd, node);
2210         spin_unlock(&pd->lock);
2211
2212         /*
2213          * Wake up the worker thread.
2214          */
2215         atomic_set(&pd->scan_queue, 1);
2216         if (was_empty) {
2217                 /* This wake_up is required for correct operation */
2218                 wake_up(&pd->wqueue);
2219         } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2220                 /*
2221                  * This wake up is not required for correct operation,
2222                  * but improves performance in some cases.
2223                  */
2224                 wake_up(&pd->wqueue);
2225         }
2226         return 0;
2227 end_io:
2228         bio_io_error(bio, bio->bi_size);
2229         return 0;
2230 }
2231
2232
2233
2234 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2235 {
2236         struct pktcdvd_device *pd = q->queuedata;
2237         sector_t zone = ZONE(bio->bi_sector, pd);
2238         int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2239         int remaining = (pd->settings.size << 9) - used;
2240         int remaining2;
2241
2242         /*
2243          * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2244          * boundary, pkt_make_request() will split the bio.
2245          */
2246         remaining2 = PAGE_SIZE - bio->bi_size;
2247         remaining = max(remaining, remaining2);
2248
2249         BUG_ON(remaining < 0);
2250         return remaining;
2251 }
2252
2253 static void pkt_init_queue(struct pktcdvd_device *pd)
2254 {
2255         request_queue_t *q = pd->disk->queue;
2256
2257         blk_queue_make_request(q, pkt_make_request);
2258         blk_queue_hardsect_size(q, CD_FRAMESIZE);
2259         blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2260         blk_queue_merge_bvec(q, pkt_merge_bvec);
2261         q->queuedata = pd;
2262 }
2263
2264 static int pkt_seq_show(struct seq_file *m, void *p)
2265 {
2266         struct pktcdvd_device *pd = m->private;
2267         char *msg;
2268         char bdev_buf[BDEVNAME_SIZE];
2269         int states[PACKET_NUM_STATES];
2270
2271         seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2272                    bdevname(pd->bdev, bdev_buf));
2273
2274         seq_printf(m, "\nSettings:\n");
2275         seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2276
2277         if (pd->settings.write_type == 0)
2278                 msg = "Packet";
2279         else
2280                 msg = "Unknown";
2281         seq_printf(m, "\twrite type:\t\t%s\n", msg);
2282
2283         seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2284         seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2285
2286         seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2287
2288         if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2289                 msg = "Mode 1";
2290         else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2291                 msg = "Mode 2";
2292         else
2293                 msg = "Unknown";
2294         seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2295
2296         seq_printf(m, "\nStatistics:\n");
2297         seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2298         seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2299         seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2300         seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2301         seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2302
2303         seq_printf(m, "\nMisc:\n");
2304         seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2305         seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2306         seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2307         seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2308         seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2309         seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2310
2311         seq_printf(m, "\nQueue state:\n");
2312         seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2313         seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2314         seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2315
2316         pkt_count_states(pd, states);
2317         seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2318                    states[0], states[1], states[2], states[3], states[4], states[5]);
2319
2320         return 0;
2321 }
2322
2323 static int pkt_seq_open(struct inode *inode, struct file *file)
2324 {
2325         return single_open(file, pkt_seq_show, PDE(inode)->data);
2326 }
2327
2328 static struct file_operations pkt_proc_fops = {
2329         .open   = pkt_seq_open,
2330         .read   = seq_read,
2331         .llseek = seq_lseek,
2332         .release = single_release
2333 };
2334
2335 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2336 {
2337         int i;
2338         int ret = 0;
2339         char b[BDEVNAME_SIZE];
2340         struct proc_dir_entry *proc;
2341         struct block_device *bdev;
2342
2343         if (pd->pkt_dev == dev) {
2344                 printk("pktcdvd: Recursive setup not allowed\n");
2345                 return -EBUSY;
2346         }
2347         for (i = 0; i < MAX_WRITERS; i++) {
2348                 struct pktcdvd_device *pd2 = pkt_devs[i];
2349                 if (!pd2)
2350                         continue;
2351                 if (pd2->bdev->bd_dev == dev) {
2352                         printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2353                         return -EBUSY;
2354                 }
2355                 if (pd2->pkt_dev == dev) {
2356                         printk("pktcdvd: Can't chain pktcdvd devices\n");
2357                         return -EBUSY;
2358                 }
2359         }
2360
2361         bdev = bdget(dev);
2362         if (!bdev)
2363                 return -ENOMEM;
2364         ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2365         if (ret)
2366                 return ret;
2367
2368         /* This is safe, since we have a reference from open(). */
2369         __module_get(THIS_MODULE);
2370
2371         if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2372                 printk("pktcdvd: not enough memory for buffers\n");
2373                 ret = -ENOMEM;
2374                 goto out_mem;
2375         }
2376
2377         pd->bdev = bdev;
2378         set_blocksize(bdev, CD_FRAMESIZE);
2379
2380         pkt_init_queue(pd);
2381
2382         atomic_set(&pd->cdrw.pending_bios, 0);
2383         pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2384         if (IS_ERR(pd->cdrw.thread)) {
2385                 printk("pktcdvd: can't start kernel thread\n");
2386                 ret = -ENOMEM;
2387                 goto out_thread;
2388         }
2389
2390         proc = create_proc_entry(pd->name, 0, pkt_proc);
2391         if (proc) {
2392                 proc->data = pd;
2393                 proc->proc_fops = &pkt_proc_fops;
2394         }
2395         DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2396         return 0;
2397
2398 out_thread:
2399         pkt_shrink_pktlist(pd);
2400 out_mem:
2401         blkdev_put(bdev);
2402         /* This is safe: open() is still holding a reference. */
2403         module_put(THIS_MODULE);
2404         return ret;
2405 }
2406
2407 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2408 {
2409         struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2410
2411         VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2412         BUG_ON(!pd);
2413
2414         switch (cmd) {
2415         /*
2416          * forward selected CDROM ioctls to CD-ROM, for UDF
2417          */
2418         case CDROMMULTISESSION:
2419         case CDROMREADTOCENTRY:
2420         case CDROM_LAST_WRITTEN:
2421         case CDROM_SEND_PACKET:
2422         case SCSI_IOCTL_SEND_COMMAND:
2423                 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2424
2425         case CDROMEJECT:
2426                 /*
2427                  * The door gets locked when the device is opened, so we
2428                  * have to unlock it or else the eject command fails.
2429                  */
2430                 pkt_lock_door(pd, 0);
2431                 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2432
2433         default:
2434                 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2435                 return -ENOTTY;
2436         }
2437
2438         return 0;
2439 }
2440
2441 static int pkt_media_changed(struct gendisk *disk)
2442 {
2443         struct pktcdvd_device *pd = disk->private_data;
2444         struct gendisk *attached_disk;
2445
2446         if (!pd)
2447                 return 0;
2448         if (!pd->bdev)
2449                 return 0;
2450         attached_disk = pd->bdev->bd_disk;
2451         if (!attached_disk)
2452                 return 0;
2453         return attached_disk->fops->media_changed(attached_disk);
2454 }
2455
2456 static struct block_device_operations pktcdvd_ops = {
2457         .owner =                THIS_MODULE,
2458         .open =                 pkt_open,
2459         .release =              pkt_close,
2460         .ioctl =                pkt_ioctl,
2461         .media_changed =        pkt_media_changed,
2462 };
2463
2464 /*
2465  * Set up mapping from pktcdvd device to CD-ROM device.
2466  */
2467 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2468 {
2469         int idx;
2470         int ret = -ENOMEM;
2471         struct pktcdvd_device *pd;
2472         struct gendisk *disk;
2473         dev_t dev = new_decode_dev(ctrl_cmd->dev);
2474
2475         for (idx = 0; idx < MAX_WRITERS; idx++)
2476                 if (!pkt_devs[idx])
2477                         break;
2478         if (idx == MAX_WRITERS) {
2479                 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2480                 return -EBUSY;
2481         }
2482
2483         pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2484         if (!pd)
2485                 return ret;
2486         memset(pd, 0, sizeof(struct pktcdvd_device));
2487
2488         pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2489         if (!pd->rb_pool)
2490                 goto out_mem;
2491
2492         disk = alloc_disk(1);
2493         if (!disk)
2494                 goto out_mem;
2495         pd->disk = disk;
2496
2497         spin_lock_init(&pd->lock);
2498         spin_lock_init(&pd->iosched.lock);
2499         sprintf(pd->name, "pktcdvd%d", idx);
2500         init_waitqueue_head(&pd->wqueue);
2501         pd->bio_queue = RB_ROOT;
2502
2503         disk->major = pkt_major;
2504         disk->first_minor = idx;
2505         disk->fops = &pktcdvd_ops;
2506         disk->flags = GENHD_FL_REMOVABLE;
2507         sprintf(disk->disk_name, "pktcdvd%d", idx);
2508         disk->private_data = pd;
2509         disk->queue = blk_alloc_queue(GFP_KERNEL);
2510         if (!disk->queue)
2511                 goto out_mem2;
2512
2513         pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2514         ret = pkt_new_dev(pd, dev);
2515         if (ret)
2516                 goto out_new_dev;
2517
2518         add_disk(disk);
2519         pkt_devs[idx] = pd;
2520         ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2521         return 0;
2522
2523 out_new_dev:
2524         blk_put_queue(disk->queue);
2525 out_mem2:
2526         put_disk(disk);
2527 out_mem:
2528         if (pd->rb_pool)
2529                 mempool_destroy(pd->rb_pool);
2530         kfree(pd);
2531         return ret;
2532 }
2533
2534 /*
2535  * Tear down mapping from pktcdvd device to CD-ROM device.
2536  */
2537 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2538 {
2539         struct pktcdvd_device *pd;
2540         int idx;
2541         dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2542
2543         for (idx = 0; idx < MAX_WRITERS; idx++) {
2544                 pd = pkt_devs[idx];
2545                 if (pd && (pd->pkt_dev == pkt_dev))
2546                         break;
2547         }
2548         if (idx == MAX_WRITERS) {
2549                 DPRINTK("pktcdvd: dev not setup\n");
2550                 return -ENXIO;
2551         }
2552
2553         if (pd->refcnt > 0)
2554                 return -EBUSY;
2555
2556         if (!IS_ERR(pd->cdrw.thread))
2557                 kthread_stop(pd->cdrw.thread);
2558
2559         blkdev_put(pd->bdev);
2560
2561         pkt_shrink_pktlist(pd);
2562
2563         remove_proc_entry(pd->name, pkt_proc);
2564         DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2565
2566         del_gendisk(pd->disk);
2567         blk_put_queue(pd->disk->queue);
2568         put_disk(pd->disk);
2569
2570         pkt_devs[idx] = NULL;
2571         mempool_destroy(pd->rb_pool);
2572         kfree(pd);
2573
2574         /* This is safe: open() is still holding a reference. */
2575         module_put(THIS_MODULE);
2576         return 0;
2577 }
2578
2579 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2580 {
2581         struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2582         if (pd) {
2583                 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2584                 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2585         } else {
2586                 ctrl_cmd->dev = 0;
2587                 ctrl_cmd->pkt_dev = 0;
2588         }
2589         ctrl_cmd->num_devices = MAX_WRITERS;
2590 }
2591
2592 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2593 {
2594         void __user *argp = (void __user *)arg;
2595         struct pkt_ctrl_command ctrl_cmd;
2596         int ret = 0;
2597
2598         if (cmd != PACKET_CTRL_CMD)
2599                 return -ENOTTY;
2600
2601         if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2602                 return -EFAULT;
2603
2604         switch (ctrl_cmd.command) {
2605         case PKT_CTRL_CMD_SETUP:
2606                 if (!capable(CAP_SYS_ADMIN))
2607                         return -EPERM;
2608                 down(&ctl_mutex);
2609                 ret = pkt_setup_dev(&ctrl_cmd);
2610                 up(&ctl_mutex);
2611                 break;
2612         case PKT_CTRL_CMD_TEARDOWN:
2613                 if (!capable(CAP_SYS_ADMIN))
2614                         return -EPERM;
2615                 down(&ctl_mutex);
2616                 ret = pkt_remove_dev(&ctrl_cmd);
2617                 up(&ctl_mutex);
2618                 break;
2619         case PKT_CTRL_CMD_STATUS:
2620                 down(&ctl_mutex);
2621                 pkt_get_status(&ctrl_cmd);
2622                 up(&ctl_mutex);
2623                 break;
2624         default:
2625                 return -ENOTTY;
2626         }
2627
2628         if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2629                 return -EFAULT;
2630         return ret;
2631 }
2632
2633
2634 static struct file_operations pkt_ctl_fops = {
2635         .ioctl   = pkt_ctl_ioctl,
2636         .owner   = THIS_MODULE,
2637 };
2638
2639 static struct miscdevice pkt_misc = {
2640         .minor          = MISC_DYNAMIC_MINOR,
2641         .name           = "pktcdvd",
2642         .devfs_name     = "pktcdvd/control",
2643         .fops           = &pkt_ctl_fops
2644 };
2645
2646 static int __init pkt_init(void)
2647 {
2648         int ret;
2649
2650         psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2651         if (!psd_pool)
2652                 return -ENOMEM;
2653
2654         ret = register_blkdev(pkt_major, "pktcdvd");
2655         if (ret < 0) {
2656                 printk("pktcdvd: Unable to register block device\n");
2657                 goto out2;
2658         }
2659         if (!pkt_major)
2660                 pkt_major = ret;
2661
2662         ret = misc_register(&pkt_misc);
2663         if (ret) {
2664                 printk("pktcdvd: Unable to register misc device\n");
2665                 goto out;
2666         }
2667
2668         init_MUTEX(&ctl_mutex);
2669
2670         pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2671
2672         DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2673         return 0;
2674
2675 out:
2676         unregister_blkdev(pkt_major, "pktcdvd");
2677 out2:
2678         mempool_destroy(psd_pool);
2679         return ret;
2680 }
2681
2682 static void __exit pkt_exit(void)
2683 {
2684         remove_proc_entry("pktcdvd", proc_root_driver);
2685         misc_deregister(&pkt_misc);
2686         unregister_blkdev(pkt_major, "pktcdvd");
2687         mempool_destroy(psd_pool);
2688 }
2689
2690 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2691 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2692 MODULE_LICENSE("GPL");
2693
2694 module_init(pkt_init);
2695 module_exit(pkt_exit);