Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 8 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
| 9 | * DVD-RAM devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * Theory of operation: |
| 12 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 13 | * At the lowest level, there is the standard driver for the CD/DVD device, |
| 14 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, |
| 15 | * but it doesn't know anything about the special restrictions that apply to |
| 16 | * packet writing. One restriction is that write requests must be aligned to |
| 17 | * packet boundaries on the physical media, and the size of a write request |
| 18 | * must be equal to the packet size. Another restriction is that a |
| 19 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read |
| 20 | * command, if the previous command was a write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 22 | * The purpose of the packet writing driver is to hide these restrictions from |
| 23 | * higher layers, such as file systems, and present a block device that can be |
| 24 | * randomly read and written using 2kB-sized blocks. |
| 25 | * |
| 26 | * The lowest layer in the packet writing driver is the packet I/O scheduler. |
| 27 | * Its data is defined by the struct packet_iosched and includes two bio |
| 28 | * queues with pending read and write requests. These queues are processed |
| 29 | * by the pkt_iosched_process_queue() function. The write requests in this |
| 30 | * queue are already properly aligned and sized. This layer is responsible for |
| 31 | * issuing the flush cache commands and scheduling the I/O in a good order. |
| 32 | * |
| 33 | * The next layer transforms unaligned write requests to aligned writes. This |
| 34 | * transformation requires reading missing pieces of data from the underlying |
| 35 | * block device, assembling the pieces to full packets and queuing them to the |
| 36 | * packet I/O scheduler. |
| 37 | * |
| 38 | * At the top layer there is a custom make_request_fn function that forwards |
| 39 | * read requests directly to the iosched queue and puts write requests in the |
| 40 | * unaligned write queue. A kernel thread performs the necessary read |
| 41 | * gathering to convert the unaligned writes to aligned writes and then feeds |
| 42 | * them to the packet I/O scheduler. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | * |
| 44 | *************************************************************************/ |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/pktcdvd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/module.h> |
| 48 | #include <linux/types.h> |
| 49 | #include <linux/kernel.h> |
| 50 | #include <linux/kthread.h> |
| 51 | #include <linux/errno.h> |
| 52 | #include <linux/spinlock.h> |
| 53 | #include <linux/file.h> |
| 54 | #include <linux/proc_fs.h> |
| 55 | #include <linux/seq_file.h> |
| 56 | #include <linux/miscdevice.h> |
| 57 | #include <linux/suspend.h> |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 58 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <scsi/scsi_cmnd.h> |
| 60 | #include <scsi/scsi_ioctl.h> |
Peter Osterlund | cef28963 | 2006-02-20 18:28:01 -0800 | [diff] [blame] | 61 | #include <scsi/scsi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | #include <asm/uaccess.h> |
| 64 | |
| 65 | #if PACKET_DEBUG |
| 66 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
| 67 | #else |
| 68 | #define DPRINTK(fmt, args...) |
| 69 | #endif |
| 70 | |
| 71 | #if PACKET_DEBUG > 1 |
| 72 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
| 73 | #else |
| 74 | #define VPRINTK(fmt, args...) |
| 75 | #endif |
| 76 | |
| 77 | #define MAX_SPEED 0xffff |
| 78 | |
| 79 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) |
| 80 | |
| 81 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
| 82 | static struct proc_dir_entry *pkt_proc; |
| 83 | static int pkt_major; |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 84 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | static mempool_t *psd_pool; |
| 86 | |
| 87 | |
| 88 | static void pkt_bio_finished(struct pktcdvd_device *pd) |
| 89 | { |
| 90 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); |
| 91 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { |
| 92 | VPRINTK("pktcdvd: queue empty\n"); |
| 93 | atomic_set(&pd->iosched.attention, 1); |
| 94 | wake_up(&pd->wqueue); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static void pkt_bio_destructor(struct bio *bio) |
| 99 | { |
| 100 | kfree(bio->bi_io_vec); |
| 101 | kfree(bio); |
| 102 | } |
| 103 | |
| 104 | static struct bio *pkt_bio_alloc(int nr_iovecs) |
| 105 | { |
| 106 | struct bio_vec *bvl = NULL; |
| 107 | struct bio *bio; |
| 108 | |
| 109 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); |
| 110 | if (!bio) |
| 111 | goto no_bio; |
| 112 | bio_init(bio); |
| 113 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 114 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if (!bvl) |
| 116 | goto no_bvl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | bio->bi_max_vecs = nr_iovecs; |
| 119 | bio->bi_io_vec = bvl; |
| 120 | bio->bi_destructor = pkt_bio_destructor; |
| 121 | |
| 122 | return bio; |
| 123 | |
| 124 | no_bvl: |
| 125 | kfree(bio); |
| 126 | no_bio: |
| 127 | return NULL; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Allocate a packet_data struct |
| 132 | */ |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 133 | static struct packet_data *pkt_alloc_packet_data(int frames) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
| 135 | int i; |
| 136 | struct packet_data *pkt; |
| 137 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 138 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (!pkt) |
| 140 | goto no_pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 142 | pkt->frames = frames; |
| 143 | pkt->w_bio = pkt_bio_alloc(frames); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | if (!pkt->w_bio) |
| 145 | goto no_bio; |
| 146 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 147 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
| 149 | if (!pkt->pages[i]) |
| 150 | goto no_page; |
| 151 | } |
| 152 | |
| 153 | spin_lock_init(&pkt->lock); |
| 154 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 155 | for (i = 0; i < frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct bio *bio = pkt_bio_alloc(1); |
| 157 | if (!bio) |
| 158 | goto no_rd_bio; |
| 159 | pkt->r_bios[i] = bio; |
| 160 | } |
| 161 | |
| 162 | return pkt; |
| 163 | |
| 164 | no_rd_bio: |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 165 | for (i = 0; i < frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | struct bio *bio = pkt->r_bios[i]; |
| 167 | if (bio) |
| 168 | bio_put(bio); |
| 169 | } |
| 170 | |
| 171 | no_page: |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 172 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (pkt->pages[i]) |
| 174 | __free_page(pkt->pages[i]); |
| 175 | bio_put(pkt->w_bio); |
| 176 | no_bio: |
| 177 | kfree(pkt); |
| 178 | no_pkt: |
| 179 | return NULL; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Free a packet_data struct |
| 184 | */ |
| 185 | static void pkt_free_packet_data(struct packet_data *pkt) |
| 186 | { |
| 187 | int i; |
| 188 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 189 | for (i = 0; i < pkt->frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | struct bio *bio = pkt->r_bios[i]; |
| 191 | if (bio) |
| 192 | bio_put(bio); |
| 193 | } |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 194 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | __free_page(pkt->pages[i]); |
| 196 | bio_put(pkt->w_bio); |
| 197 | kfree(pkt); |
| 198 | } |
| 199 | |
| 200 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) |
| 201 | { |
| 202 | struct packet_data *pkt, *next; |
| 203 | |
| 204 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); |
| 205 | |
| 206 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { |
| 207 | pkt_free_packet_data(pkt); |
| 208 | } |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 209 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) |
| 213 | { |
| 214 | struct packet_data *pkt; |
| 215 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 216 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | while (nr_packets > 0) { |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 219 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (!pkt) { |
| 221 | pkt_shrink_pktlist(pd); |
| 222 | return 0; |
| 223 | } |
| 224 | pkt->id = nr_packets; |
| 225 | pkt->pd = pd; |
| 226 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
| 227 | nr_packets--; |
| 228 | } |
| 229 | return 1; |
| 230 | } |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Peter Osterlund | ac89396 | 2006-01-14 13:21:32 -0800 | [diff] [blame] | 240 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Peter Osterlund | ac89396 | 2006-01-14 13:21:32 -0800 | [diff] [blame] | 308 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Peter Osterlund | cef28963 | 2006-02-20 18:28:01 -0800 | [diff] [blame] | 374 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | rq->ref_count++; |
| 377 | rq->flags |= REQ_NOMERGE; |
| 378 | rq->waiting = &wait; |
| 379 | rq->end_io = blk_end_sync_rq; |
| 380 | elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1); |
| 381 | generic_unplug_device(q); |
| 382 | wait_for_completion(&wait); |
| 383 | |
| 384 | if (rq->errors) |
| 385 | err = -EIO; |
| 386 | |
| 387 | blk_put_request(rq); |
| 388 | return err; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * A generic sense dump / resolve mechanism should be implemented across |
| 393 | * all ATAPI + SCSI devices. |
| 394 | */ |
| 395 | static void pkt_dump_sense(struct packet_command *cgc) |
| 396 | { |
| 397 | static char *info[9] = { "No sense", "Recovered error", "Not ready", |
| 398 | "Medium error", "Hardware error", "Illegal request", |
| 399 | "Unit attention", "Data protect", "Blank check" }; |
| 400 | int i; |
| 401 | struct request_sense *sense = cgc->sense; |
| 402 | |
| 403 | printk("pktcdvd:"); |
| 404 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
| 405 | printk(" %02x", cgc->cmd[i]); |
| 406 | printk(" - "); |
| 407 | |
| 408 | if (sense == NULL) { |
| 409 | printk("no sense\n"); |
| 410 | return; |
| 411 | } |
| 412 | |
| 413 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); |
| 414 | |
| 415 | if (sense->sense_key > 8) { |
| 416 | printk(" (INVALID)\n"); |
| 417 | return; |
| 418 | } |
| 419 | |
| 420 | printk(" (%s)\n", info[sense->sense_key]); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * flush the drive cache to media |
| 425 | */ |
| 426 | static int pkt_flush_cache(struct pktcdvd_device *pd) |
| 427 | { |
| 428 | struct packet_command cgc; |
| 429 | |
| 430 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 431 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; |
| 432 | cgc.quiet = 1; |
| 433 | |
| 434 | /* |
| 435 | * the IMMED bit -- we default to not setting it, although that |
| 436 | * would allow a much faster close, this is safer |
| 437 | */ |
| 438 | #if 0 |
| 439 | cgc.cmd[1] = 1 << 1; |
| 440 | #endif |
| 441 | return pkt_generic_packet(pd, &cgc); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * speed is given as the normal factor, e.g. 4 for 4x |
| 446 | */ |
| 447 | static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed) |
| 448 | { |
| 449 | struct packet_command cgc; |
| 450 | struct request_sense sense; |
| 451 | int ret; |
| 452 | |
| 453 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 454 | cgc.sense = &sense; |
| 455 | cgc.cmd[0] = GPCMD_SET_SPEED; |
| 456 | cgc.cmd[2] = (read_speed >> 8) & 0xff; |
| 457 | cgc.cmd[3] = read_speed & 0xff; |
| 458 | cgc.cmd[4] = (write_speed >> 8) & 0xff; |
| 459 | cgc.cmd[5] = write_speed & 0xff; |
| 460 | |
| 461 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 462 | pkt_dump_sense(&cgc); |
| 463 | |
| 464 | return ret; |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * Queue a bio for processing by the low-level CD device. Must be called |
| 469 | * from process context. |
| 470 | */ |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 471 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | { |
| 473 | spin_lock(&pd->iosched.lock); |
| 474 | if (bio_data_dir(bio) == READ) { |
| 475 | pkt_add_list_last(bio, &pd->iosched.read_queue, |
| 476 | &pd->iosched.read_queue_tail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } else { |
| 478 | pkt_add_list_last(bio, &pd->iosched.write_queue, |
| 479 | &pd->iosched.write_queue_tail); |
| 480 | } |
| 481 | spin_unlock(&pd->iosched.lock); |
| 482 | |
| 483 | atomic_set(&pd->iosched.attention, 1); |
| 484 | wake_up(&pd->wqueue); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Process the queued read/write requests. This function handles special |
| 489 | * requirements for CDRW drives: |
| 490 | * - A cache flush command must be inserted before a read request if the |
| 491 | * previous request was a write. |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 492 | * - Switching between reading and writing is slow, so don't do it more often |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | * than necessary. |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 494 | * - Optimize for throughput at the expense of latency. This means that streaming |
| 495 | * writes will never be interrupted by a read, but if the drive has to seek |
| 496 | * before the next write, switch to reading instead if there are any pending |
| 497 | * read requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | * - Set the read speed according to current usage pattern. When only reading |
| 499 | * from the device, it's best to use the highest possible read speed, but |
| 500 | * when switching often between reading and writing, it's better to have the |
| 501 | * same read and write speeds. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | */ |
| 503 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) |
| 504 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
| 506 | if (atomic_read(&pd->iosched.attention) == 0) |
| 507 | return; |
| 508 | atomic_set(&pd->iosched.attention, 0); |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | for (;;) { |
| 511 | struct bio *bio; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 512 | int reads_queued, writes_queued; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | spin_lock(&pd->iosched.lock); |
| 515 | reads_queued = (pd->iosched.read_queue != NULL); |
| 516 | writes_queued = (pd->iosched.write_queue != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | spin_unlock(&pd->iosched.lock); |
| 518 | |
| 519 | if (!reads_queued && !writes_queued) |
| 520 | break; |
| 521 | |
| 522 | if (pd->iosched.writing) { |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 523 | int need_write_seek = 1; |
| 524 | spin_lock(&pd->iosched.lock); |
| 525 | bio = pd->iosched.write_queue; |
| 526 | spin_unlock(&pd->iosched.lock); |
| 527 | if (bio && (bio->bi_sector == pd->iosched.last_write)) |
| 528 | need_write_seek = 0; |
| 529 | if (need_write_seek && reads_queued) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
| 531 | VPRINTK("pktcdvd: write, waiting\n"); |
| 532 | break; |
| 533 | } |
| 534 | pkt_flush_cache(pd); |
| 535 | pd->iosched.writing = 0; |
| 536 | } |
| 537 | } else { |
| 538 | if (!reads_queued && writes_queued) { |
| 539 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
| 540 | VPRINTK("pktcdvd: read, waiting\n"); |
| 541 | break; |
| 542 | } |
| 543 | pd->iosched.writing = 1; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | spin_lock(&pd->iosched.lock); |
| 548 | if (pd->iosched.writing) { |
| 549 | bio = pkt_get_list_first(&pd->iosched.write_queue, |
| 550 | &pd->iosched.write_queue_tail); |
| 551 | } else { |
| 552 | bio = pkt_get_list_first(&pd->iosched.read_queue, |
| 553 | &pd->iosched.read_queue_tail); |
| 554 | } |
| 555 | spin_unlock(&pd->iosched.lock); |
| 556 | |
| 557 | if (!bio) |
| 558 | continue; |
| 559 | |
| 560 | if (bio_data_dir(bio) == READ) |
| 561 | pd->iosched.successive_reads += bio->bi_size >> 10; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 562 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | pd->iosched.successive_reads = 0; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 564 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
| 565 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
| 567 | if (pd->read_speed == pd->write_speed) { |
| 568 | pd->read_speed = MAX_SPEED; |
| 569 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
| 570 | } |
| 571 | } else { |
| 572 | if (pd->read_speed != pd->write_speed) { |
| 573 | pd->read_speed = pd->write_speed; |
| 574 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | atomic_inc(&pd->cdrw.pending_bios); |
| 579 | generic_make_request(bio); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * Special care is needed if the underlying block device has a small |
| 585 | * max_phys_segments value. |
| 586 | */ |
| 587 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q) |
| 588 | { |
| 589 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { |
| 590 | /* |
| 591 | * The cdrom device can handle one segment/frame |
| 592 | */ |
| 593 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); |
| 594 | return 0; |
| 595 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { |
| 596 | /* |
| 597 | * We can handle this case at the expense of some extra memory |
| 598 | * copies during write operations |
| 599 | */ |
| 600 | set_bit(PACKET_MERGE_SEGS, &pd->flags); |
| 601 | return 0; |
| 602 | } else { |
| 603 | printk("pktcdvd: cdrom max_phys_segments too small\n"); |
| 604 | return -EIO; |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page |
| 610 | */ |
| 611 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) |
| 612 | { |
| 613 | unsigned int copy_size = CD_FRAMESIZE; |
| 614 | |
| 615 | while (copy_size > 0) { |
| 616 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); |
| 617 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + |
| 618 | src_bvl->bv_offset + offs; |
| 619 | void *vto = page_address(dst_page) + dst_offs; |
| 620 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); |
| 621 | |
| 622 | BUG_ON(len < 0); |
| 623 | memcpy(vto, vfrom, len); |
| 624 | kunmap_atomic(vfrom, KM_USER0); |
| 625 | |
| 626 | seg++; |
| 627 | offs = 0; |
| 628 | dst_offs += len; |
| 629 | copy_size -= len; |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * Copy all data for this packet to pkt->pages[], so that |
| 635 | * a) The number of required segments for the write bio is minimized, which |
| 636 | * is necessary for some scsi controllers. |
| 637 | * b) The data can be used as cache to avoid read requests if we receive a |
| 638 | * new write request for the same zone. |
| 639 | */ |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 640 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | { |
| 642 | int f, p, offs; |
| 643 | |
| 644 | /* Copy all data to pkt->pages[] */ |
| 645 | p = 0; |
| 646 | offs = 0; |
| 647 | for (f = 0; f < pkt->frames; f++) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 648 | if (bvec[f].bv_page != pkt->pages[p]) { |
| 649 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | void *vto = page_address(pkt->pages[p]) + offs; |
| 651 | memcpy(vto, vfrom, CD_FRAMESIZE); |
| 652 | kunmap_atomic(vfrom, KM_USER0); |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 653 | bvec[f].bv_page = pkt->pages[p]; |
| 654 | bvec[f].bv_offset = offs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } else { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 656 | BUG_ON(bvec[f].bv_offset != offs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | offs += CD_FRAMESIZE; |
| 659 | if (offs >= PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | offs = 0; |
| 661 | p++; |
| 662 | } |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err) |
| 667 | { |
| 668 | struct packet_data *pkt = bio->bi_private; |
| 669 | struct pktcdvd_device *pd = pkt->pd; |
| 670 | BUG_ON(!pd); |
| 671 | |
| 672 | if (bio->bi_size) |
| 673 | return 1; |
| 674 | |
| 675 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, |
| 676 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); |
| 677 | |
| 678 | if (err) |
| 679 | atomic_inc(&pkt->io_errors); |
| 680 | if (atomic_dec_and_test(&pkt->io_wait)) { |
| 681 | atomic_inc(&pkt->run_sm); |
| 682 | wake_up(&pd->wqueue); |
| 683 | } |
| 684 | pkt_bio_finished(pd); |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err) |
| 690 | { |
| 691 | struct packet_data *pkt = bio->bi_private; |
| 692 | struct pktcdvd_device *pd = pkt->pd; |
| 693 | BUG_ON(!pd); |
| 694 | |
| 695 | if (bio->bi_size) |
| 696 | return 1; |
| 697 | |
| 698 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); |
| 699 | |
| 700 | pd->stats.pkt_ended++; |
| 701 | |
| 702 | pkt_bio_finished(pd); |
| 703 | atomic_dec(&pkt->io_wait); |
| 704 | atomic_inc(&pkt->run_sm); |
| 705 | wake_up(&pd->wqueue); |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * Schedule reads for the holes in a packet |
| 711 | */ |
| 712 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 713 | { |
| 714 | int frames_read = 0; |
| 715 | struct bio *bio; |
| 716 | int f; |
| 717 | char written[PACKET_MAX_SIZE]; |
| 718 | |
| 719 | BUG_ON(!pkt->orig_bios); |
| 720 | |
| 721 | atomic_set(&pkt->io_wait, 0); |
| 722 | atomic_set(&pkt->io_errors, 0); |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* |
| 725 | * Figure out which frames we need to read before we can write. |
| 726 | */ |
| 727 | memset(written, 0, sizeof(written)); |
| 728 | spin_lock(&pkt->lock); |
| 729 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { |
| 730 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
| 731 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
Peter Osterlund | 06e7ab5 | 2005-09-13 01:25:28 -0700 | [diff] [blame] | 732 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | BUG_ON(first_frame < 0); |
| 734 | BUG_ON(first_frame + num_frames > pkt->frames); |
| 735 | for (f = first_frame; f < first_frame + num_frames; f++) |
| 736 | written[f] = 1; |
| 737 | } |
| 738 | spin_unlock(&pkt->lock); |
| 739 | |
Peter Osterlund | 06e7ab5 | 2005-09-13 01:25:28 -0700 | [diff] [blame] | 740 | if (pkt->cache_valid) { |
| 741 | VPRINTK("pkt_gather_data: zone %llx cached\n", |
| 742 | (unsigned long long)pkt->sector); |
| 743 | goto out_account; |
| 744 | } |
| 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | /* |
| 747 | * Schedule reads for missing parts of the packet. |
| 748 | */ |
| 749 | for (f = 0; f < pkt->frames; f++) { |
| 750 | int p, offset; |
| 751 | if (written[f]) |
| 752 | continue; |
| 753 | bio = pkt->r_bios[f]; |
| 754 | bio_init(bio); |
| 755 | bio->bi_max_vecs = 1; |
| 756 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
| 757 | bio->bi_bdev = pd->bdev; |
| 758 | bio->bi_end_io = pkt_end_io_read; |
| 759 | bio->bi_private = pkt; |
| 760 | |
| 761 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; |
| 762 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
| 763 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", |
| 764 | f, pkt->pages[p], offset); |
| 765 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) |
| 766 | BUG(); |
| 767 | |
| 768 | atomic_inc(&pkt->io_wait); |
| 769 | bio->bi_rw = READ; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 770 | pkt_queue_bio(pd, bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | frames_read++; |
| 772 | } |
| 773 | |
| 774 | out_account: |
| 775 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", |
| 776 | frames_read, (unsigned long long)pkt->sector); |
| 777 | pd->stats.pkt_started++; |
| 778 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Find a packet matching zone, or the least recently used packet if |
| 783 | * there is no match. |
| 784 | */ |
| 785 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) |
| 786 | { |
| 787 | struct packet_data *pkt; |
| 788 | |
| 789 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { |
| 790 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { |
| 791 | list_del_init(&pkt->list); |
| 792 | if (pkt->sector != zone) |
| 793 | pkt->cache_valid = 0; |
Peter Osterlund | 610827d | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 794 | return pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | } |
Peter Osterlund | 610827d | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 797 | BUG(); |
| 798 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 802 | { |
| 803 | if (pkt->cache_valid) { |
| 804 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
| 805 | } else { |
| 806 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * recover a failed write, query for relocation if possible |
| 812 | * |
| 813 | * returns 1 if recovery is possible, or 0 if not |
| 814 | * |
| 815 | */ |
| 816 | static int pkt_start_recovery(struct packet_data *pkt) |
| 817 | { |
| 818 | /* |
| 819 | * FIXME. We need help from the file system to implement |
| 820 | * recovery handling. |
| 821 | */ |
| 822 | return 0; |
| 823 | #if 0 |
| 824 | struct request *rq = pkt->rq; |
| 825 | struct pktcdvd_device *pd = rq->rq_disk->private_data; |
| 826 | struct block_device *pkt_bdev; |
| 827 | struct super_block *sb = NULL; |
| 828 | unsigned long old_block, new_block; |
| 829 | sector_t new_sector; |
| 830 | |
| 831 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); |
| 832 | if (pkt_bdev) { |
| 833 | sb = get_super(pkt_bdev); |
| 834 | bdput(pkt_bdev); |
| 835 | } |
| 836 | |
| 837 | if (!sb) |
| 838 | return 0; |
| 839 | |
| 840 | if (!sb->s_op || !sb->s_op->relocate_blocks) |
| 841 | goto out; |
| 842 | |
| 843 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); |
| 844 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) |
| 845 | goto out; |
| 846 | |
| 847 | new_sector = new_block * (CD_FRAMESIZE >> 9); |
| 848 | pkt->sector = new_sector; |
| 849 | |
| 850 | pkt->bio->bi_sector = new_sector; |
| 851 | pkt->bio->bi_next = NULL; |
| 852 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; |
| 853 | pkt->bio->bi_idx = 0; |
| 854 | |
| 855 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); |
| 856 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); |
| 857 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); |
| 858 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); |
| 859 | BUG_ON(pkt->bio->bi_private != pkt); |
| 860 | |
| 861 | drop_super(sb); |
| 862 | return 1; |
| 863 | |
| 864 | out: |
| 865 | drop_super(sb); |
| 866 | return 0; |
| 867 | #endif |
| 868 | } |
| 869 | |
| 870 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) |
| 871 | { |
| 872 | #if PACKET_DEBUG > 1 |
| 873 | static const char *state_name[] = { |
| 874 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" |
| 875 | }; |
| 876 | enum packet_data_state old_state = pkt->state; |
| 877 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, |
| 878 | state_name[old_state], state_name[state]); |
| 879 | #endif |
| 880 | pkt->state = state; |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * Scan the work queue to see if we can start a new packet. |
| 885 | * returns non-zero if any work was done. |
| 886 | */ |
| 887 | static int pkt_handle_queue(struct pktcdvd_device *pd) |
| 888 | { |
| 889 | struct packet_data *pkt, *p; |
| 890 | struct bio *bio = NULL; |
| 891 | sector_t zone = 0; /* Suppress gcc warning */ |
| 892 | struct pkt_rb_node *node, *first_node; |
| 893 | struct rb_node *n; |
| 894 | |
| 895 | VPRINTK("handle_queue\n"); |
| 896 | |
| 897 | atomic_set(&pd->scan_queue, 0); |
| 898 | |
| 899 | if (list_empty(&pd->cdrw.pkt_free_list)) { |
| 900 | VPRINTK("handle_queue: no pkt\n"); |
| 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * Try to find a zone we are not already working on. |
| 906 | */ |
| 907 | spin_lock(&pd->lock); |
| 908 | first_node = pkt_rbtree_find(pd, pd->current_sector); |
| 909 | if (!first_node) { |
| 910 | n = rb_first(&pd->bio_queue); |
| 911 | if (n) |
| 912 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); |
| 913 | } |
| 914 | node = first_node; |
| 915 | while (node) { |
| 916 | bio = node->bio; |
| 917 | zone = ZONE(bio->bi_sector, pd); |
| 918 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
Peter Osterlund | 7baeb6a | 2005-05-16 21:53:42 -0700 | [diff] [blame] | 919 | if (p->sector == zone) { |
| 920 | bio = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | goto try_next_bio; |
Peter Osterlund | 7baeb6a | 2005-05-16 21:53:42 -0700 | [diff] [blame] | 922 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } |
| 924 | break; |
| 925 | try_next_bio: |
| 926 | node = pkt_rbtree_next(node); |
| 927 | if (!node) { |
| 928 | n = rb_first(&pd->bio_queue); |
| 929 | if (n) |
| 930 | node = rb_entry(n, struct pkt_rb_node, rb_node); |
| 931 | } |
| 932 | if (node == first_node) |
| 933 | node = NULL; |
| 934 | } |
| 935 | spin_unlock(&pd->lock); |
| 936 | if (!bio) { |
| 937 | VPRINTK("handle_queue: no bio\n"); |
| 938 | return 0; |
| 939 | } |
| 940 | |
| 941 | pkt = pkt_get_packet_data(pd, zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
| 943 | pd->current_sector = zone + pd->settings.size; |
| 944 | pkt->sector = zone; |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 945 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | pkt->write_size = 0; |
| 947 | |
| 948 | /* |
| 949 | * Scan work queue for bios in the same zone and link them |
| 950 | * to this packet. |
| 951 | */ |
| 952 | spin_lock(&pd->lock); |
| 953 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); |
| 954 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
| 955 | bio = node->bio; |
| 956 | VPRINTK("pkt_handle_queue: found zone=%llx\n", |
| 957 | (unsigned long long)ZONE(bio->bi_sector, pd)); |
| 958 | if (ZONE(bio->bi_sector, pd) != zone) |
| 959 | break; |
| 960 | pkt_rbtree_erase(pd, node); |
| 961 | spin_lock(&pkt->lock); |
| 962 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); |
| 963 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
| 964 | spin_unlock(&pkt->lock); |
| 965 | } |
| 966 | spin_unlock(&pd->lock); |
| 967 | |
| 968 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); |
| 969 | pkt_set_state(pkt, PACKET_WAITING_STATE); |
| 970 | atomic_set(&pkt->run_sm, 1); |
| 971 | |
| 972 | spin_lock(&pd->cdrw.active_list_lock); |
| 973 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); |
| 974 | spin_unlock(&pd->cdrw.active_list_lock); |
| 975 | |
| 976 | return 1; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Assemble a bio to write one packet and queue the bio for processing |
| 981 | * by the underlying block device. |
| 982 | */ |
| 983 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 984 | { |
| 985 | struct bio *bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | int f; |
| 987 | int frames_write; |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 988 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
| 990 | for (f = 0; f < pkt->frames; f++) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 991 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
| 992 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | } |
| 994 | |
| 995 | /* |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 996 | * Fill-in bvec with data from orig_bios. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | */ |
| 998 | frames_write = 0; |
| 999 | spin_lock(&pkt->lock); |
| 1000 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { |
| 1001 | int segment = bio->bi_idx; |
| 1002 | int src_offs = 0; |
| 1003 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
| 1004 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
| 1005 | BUG_ON(first_frame < 0); |
| 1006 | BUG_ON(first_frame + num_frames > pkt->frames); |
| 1007 | for (f = first_frame; f < first_frame + num_frames; f++) { |
| 1008 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); |
| 1009 | |
| 1010 | while (src_offs >= src_bvl->bv_len) { |
| 1011 | src_offs -= src_bvl->bv_len; |
| 1012 | segment++; |
| 1013 | BUG_ON(segment >= bio->bi_vcnt); |
| 1014 | src_bvl = bio_iovec_idx(bio, segment); |
| 1015 | } |
| 1016 | |
| 1017 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1018 | bvec[f].bv_page = src_bvl->bv_page; |
| 1019 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | } else { |
| 1021 | pkt_copy_bio_data(bio, segment, src_offs, |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1022 | bvec[f].bv_page, bvec[f].bv_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | } |
| 1024 | src_offs += CD_FRAMESIZE; |
| 1025 | frames_write++; |
| 1026 | } |
| 1027 | } |
| 1028 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
| 1029 | spin_unlock(&pkt->lock); |
| 1030 | |
| 1031 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", |
| 1032 | frames_write, (unsigned long long)pkt->sector); |
| 1033 | BUG_ON(frames_write != pkt->write_size); |
| 1034 | |
| 1035 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1036 | pkt_make_local_copy(pkt, bvec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | pkt->cache_valid = 1; |
| 1038 | } else { |
| 1039 | pkt->cache_valid = 0; |
| 1040 | } |
| 1041 | |
| 1042 | /* Start the write request */ |
| 1043 | bio_init(pkt->w_bio); |
| 1044 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; |
| 1045 | pkt->w_bio->bi_sector = pkt->sector; |
| 1046 | pkt->w_bio->bi_bdev = pd->bdev; |
| 1047 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; |
| 1048 | pkt->w_bio->bi_private = pkt; |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1049 | for (f = 0; f < pkt->frames; f++) |
| 1050 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
| 1051 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt); |
| 1053 | |
| 1054 | atomic_set(&pkt->io_wait, 1); |
| 1055 | pkt->w_bio->bi_rw = WRITE; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 1056 | pkt_queue_bio(pd, pkt->w_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) |
| 1060 | { |
| 1061 | struct bio *bio, *next; |
| 1062 | |
| 1063 | if (!uptodate) |
| 1064 | pkt->cache_valid = 0; |
| 1065 | |
| 1066 | /* Finish all bios corresponding to this packet */ |
| 1067 | bio = pkt->orig_bios; |
| 1068 | while (bio) { |
| 1069 | next = bio->bi_next; |
| 1070 | bio->bi_next = NULL; |
| 1071 | bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO); |
| 1072 | bio = next; |
| 1073 | } |
| 1074 | pkt->orig_bios = pkt->orig_bios_tail = NULL; |
| 1075 | } |
| 1076 | |
| 1077 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 1078 | { |
| 1079 | int uptodate; |
| 1080 | |
| 1081 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); |
| 1082 | |
| 1083 | for (;;) { |
| 1084 | switch (pkt->state) { |
| 1085 | case PACKET_WAITING_STATE: |
| 1086 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) |
| 1087 | return; |
| 1088 | |
| 1089 | pkt->sleep_time = 0; |
| 1090 | pkt_gather_data(pd, pkt); |
| 1091 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); |
| 1092 | break; |
| 1093 | |
| 1094 | case PACKET_READ_WAIT_STATE: |
| 1095 | if (atomic_read(&pkt->io_wait) > 0) |
| 1096 | return; |
| 1097 | |
| 1098 | if (atomic_read(&pkt->io_errors) > 0) { |
| 1099 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
| 1100 | } else { |
| 1101 | pkt_start_write(pd, pkt); |
| 1102 | } |
| 1103 | break; |
| 1104 | |
| 1105 | case PACKET_WRITE_WAIT_STATE: |
| 1106 | if (atomic_read(&pkt->io_wait) > 0) |
| 1107 | return; |
| 1108 | |
| 1109 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { |
| 1110 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
| 1111 | } else { |
| 1112 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
| 1113 | } |
| 1114 | break; |
| 1115 | |
| 1116 | case PACKET_RECOVERY_STATE: |
| 1117 | if (pkt_start_recovery(pkt)) { |
| 1118 | pkt_start_write(pd, pkt); |
| 1119 | } else { |
| 1120 | VPRINTK("No recovery possible\n"); |
| 1121 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
| 1122 | } |
| 1123 | break; |
| 1124 | |
| 1125 | case PACKET_FINISHED_STATE: |
| 1126 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); |
| 1127 | pkt_finish_packet(pkt, uptodate); |
| 1128 | return; |
| 1129 | |
| 1130 | default: |
| 1131 | BUG(); |
| 1132 | break; |
| 1133 | } |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | static void pkt_handle_packets(struct pktcdvd_device *pd) |
| 1138 | { |
| 1139 | struct packet_data *pkt, *next; |
| 1140 | |
| 1141 | VPRINTK("pkt_handle_packets\n"); |
| 1142 | |
| 1143 | /* |
| 1144 | * Run state machine for active packets |
| 1145 | */ |
| 1146 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1147 | if (atomic_read(&pkt->run_sm) > 0) { |
| 1148 | atomic_set(&pkt->run_sm, 0); |
| 1149 | pkt_run_state_machine(pd, pkt); |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | /* |
| 1154 | * Move no longer active packets to the free list |
| 1155 | */ |
| 1156 | spin_lock(&pd->cdrw.active_list_lock); |
| 1157 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { |
| 1158 | if (pkt->state == PACKET_FINISHED_STATE) { |
| 1159 | list_del(&pkt->list); |
| 1160 | pkt_put_packet_data(pd, pkt); |
| 1161 | pkt_set_state(pkt, PACKET_IDLE_STATE); |
| 1162 | atomic_set(&pd->scan_queue, 1); |
| 1163 | } |
| 1164 | } |
| 1165 | spin_unlock(&pd->cdrw.active_list_lock); |
| 1166 | } |
| 1167 | |
| 1168 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) |
| 1169 | { |
| 1170 | struct packet_data *pkt; |
| 1171 | int i; |
| 1172 | |
Peter Osterlund | ae7642b | 2005-11-13 16:06:36 -0800 | [diff] [blame] | 1173 | for (i = 0; i < PACKET_NUM_STATES; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | states[i] = 0; |
| 1175 | |
| 1176 | spin_lock(&pd->cdrw.active_list_lock); |
| 1177 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1178 | states[pkt->state]++; |
| 1179 | } |
| 1180 | spin_unlock(&pd->cdrw.active_list_lock); |
| 1181 | } |
| 1182 | |
| 1183 | /* |
| 1184 | * kcdrwd is woken up when writes have been queued for one of our |
| 1185 | * registered devices |
| 1186 | */ |
| 1187 | static int kcdrwd(void *foobar) |
| 1188 | { |
| 1189 | struct pktcdvd_device *pd = foobar; |
| 1190 | struct packet_data *pkt; |
| 1191 | long min_sleep_time, residue; |
| 1192 | |
| 1193 | set_user_nice(current, -20); |
| 1194 | |
| 1195 | for (;;) { |
| 1196 | DECLARE_WAITQUEUE(wait, current); |
| 1197 | |
| 1198 | /* |
| 1199 | * Wait until there is something to do |
| 1200 | */ |
| 1201 | add_wait_queue(&pd->wqueue, &wait); |
| 1202 | for (;;) { |
| 1203 | set_current_state(TASK_INTERRUPTIBLE); |
| 1204 | |
| 1205 | /* Check if we need to run pkt_handle_queue */ |
| 1206 | if (atomic_read(&pd->scan_queue) > 0) |
| 1207 | goto work_to_do; |
| 1208 | |
| 1209 | /* Check if we need to run the state machine for some packet */ |
| 1210 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1211 | if (atomic_read(&pkt->run_sm) > 0) |
| 1212 | goto work_to_do; |
| 1213 | } |
| 1214 | |
| 1215 | /* Check if we need to process the iosched queues */ |
| 1216 | if (atomic_read(&pd->iosched.attention) != 0) |
| 1217 | goto work_to_do; |
| 1218 | |
| 1219 | /* Otherwise, go to sleep */ |
| 1220 | if (PACKET_DEBUG > 1) { |
| 1221 | int states[PACKET_NUM_STATES]; |
| 1222 | pkt_count_states(pd, states); |
| 1223 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
| 1224 | states[0], states[1], states[2], states[3], |
| 1225 | states[4], states[5]); |
| 1226 | } |
| 1227 | |
| 1228 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; |
| 1229 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1230 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) |
| 1231 | min_sleep_time = pkt->sleep_time; |
| 1232 | } |
| 1233 | |
| 1234 | generic_unplug_device(bdev_get_queue(pd->bdev)); |
| 1235 | |
| 1236 | VPRINTK("kcdrwd: sleeping\n"); |
| 1237 | residue = schedule_timeout(min_sleep_time); |
| 1238 | VPRINTK("kcdrwd: wake up\n"); |
| 1239 | |
| 1240 | /* make swsusp happy with our thread */ |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 1241 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
| 1243 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1244 | if (!pkt->sleep_time) |
| 1245 | continue; |
| 1246 | pkt->sleep_time -= min_sleep_time - residue; |
| 1247 | if (pkt->sleep_time <= 0) { |
| 1248 | pkt->sleep_time = 0; |
| 1249 | atomic_inc(&pkt->run_sm); |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | if (signal_pending(current)) { |
| 1254 | flush_signals(current); |
| 1255 | } |
| 1256 | if (kthread_should_stop()) |
| 1257 | break; |
| 1258 | } |
| 1259 | work_to_do: |
| 1260 | set_current_state(TASK_RUNNING); |
| 1261 | remove_wait_queue(&pd->wqueue, &wait); |
| 1262 | |
| 1263 | if (kthread_should_stop()) |
| 1264 | break; |
| 1265 | |
| 1266 | /* |
| 1267 | * if pkt_handle_queue returns true, we can queue |
| 1268 | * another request. |
| 1269 | */ |
| 1270 | while (pkt_handle_queue(pd)) |
| 1271 | ; |
| 1272 | |
| 1273 | /* |
| 1274 | * Handle packet state machine |
| 1275 | */ |
| 1276 | pkt_handle_packets(pd); |
| 1277 | |
| 1278 | /* |
| 1279 | * Handle iosched queues |
| 1280 | */ |
| 1281 | pkt_iosched_process_queue(pd); |
| 1282 | } |
| 1283 | |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | static void pkt_print_settings(struct pktcdvd_device *pd) |
| 1288 | { |
| 1289 | printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
| 1290 | printk("%u blocks, ", pd->settings.size >> 2); |
| 1291 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); |
| 1292 | } |
| 1293 | |
| 1294 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) |
| 1295 | { |
| 1296 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
| 1297 | |
| 1298 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; |
| 1299 | cgc->cmd[2] = page_code | (page_control << 6); |
| 1300 | cgc->cmd[7] = cgc->buflen >> 8; |
| 1301 | cgc->cmd[8] = cgc->buflen & 0xff; |
| 1302 | cgc->data_direction = CGC_DATA_READ; |
| 1303 | return pkt_generic_packet(pd, cgc); |
| 1304 | } |
| 1305 | |
| 1306 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) |
| 1307 | { |
| 1308 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
| 1309 | memset(cgc->buffer, 0, 2); |
| 1310 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; |
| 1311 | cgc->cmd[1] = 0x10; /* PF */ |
| 1312 | cgc->cmd[7] = cgc->buflen >> 8; |
| 1313 | cgc->cmd[8] = cgc->buflen & 0xff; |
| 1314 | cgc->data_direction = CGC_DATA_WRITE; |
| 1315 | return pkt_generic_packet(pd, cgc); |
| 1316 | } |
| 1317 | |
| 1318 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) |
| 1319 | { |
| 1320 | struct packet_command cgc; |
| 1321 | int ret; |
| 1322 | |
| 1323 | /* set up command and get the disc info */ |
| 1324 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); |
| 1325 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; |
| 1326 | cgc.cmd[8] = cgc.buflen = 2; |
| 1327 | cgc.quiet = 1; |
| 1328 | |
| 1329 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 1330 | return ret; |
| 1331 | |
| 1332 | /* not all drives have the same disc_info length, so requeue |
| 1333 | * packet with the length the drive tells us it can supply |
| 1334 | */ |
| 1335 | cgc.buflen = be16_to_cpu(di->disc_information_length) + |
| 1336 | sizeof(di->disc_information_length); |
| 1337 | |
| 1338 | if (cgc.buflen > sizeof(disc_information)) |
| 1339 | cgc.buflen = sizeof(disc_information); |
| 1340 | |
| 1341 | cgc.cmd[8] = cgc.buflen; |
| 1342 | return pkt_generic_packet(pd, &cgc); |
| 1343 | } |
| 1344 | |
| 1345 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) |
| 1346 | { |
| 1347 | struct packet_command cgc; |
| 1348 | int ret; |
| 1349 | |
| 1350 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); |
| 1351 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; |
| 1352 | cgc.cmd[1] = type & 3; |
| 1353 | cgc.cmd[4] = (track & 0xff00) >> 8; |
| 1354 | cgc.cmd[5] = track & 0xff; |
| 1355 | cgc.cmd[8] = 8; |
| 1356 | cgc.quiet = 1; |
| 1357 | |
| 1358 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 1359 | return ret; |
| 1360 | |
| 1361 | cgc.buflen = be16_to_cpu(ti->track_information_length) + |
| 1362 | sizeof(ti->track_information_length); |
| 1363 | |
| 1364 | if (cgc.buflen > sizeof(track_information)) |
| 1365 | cgc.buflen = sizeof(track_information); |
| 1366 | |
| 1367 | cgc.cmd[8] = cgc.buflen; |
| 1368 | return pkt_generic_packet(pd, &cgc); |
| 1369 | } |
| 1370 | |
| 1371 | static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written) |
| 1372 | { |
| 1373 | disc_information di; |
| 1374 | track_information ti; |
| 1375 | __u32 last_track; |
| 1376 | int ret = -1; |
| 1377 | |
| 1378 | if ((ret = pkt_get_disc_info(pd, &di))) |
| 1379 | return ret; |
| 1380 | |
| 1381 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; |
| 1382 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| 1383 | return ret; |
| 1384 | |
| 1385 | /* if this track is blank, try the previous. */ |
| 1386 | if (ti.blank) { |
| 1387 | last_track--; |
| 1388 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| 1389 | return ret; |
| 1390 | } |
| 1391 | |
| 1392 | /* if last recorded field is valid, return it. */ |
| 1393 | if (ti.lra_v) { |
| 1394 | *last_written = be32_to_cpu(ti.last_rec_address); |
| 1395 | } else { |
| 1396 | /* make it up instead */ |
| 1397 | *last_written = be32_to_cpu(ti.track_start) + |
| 1398 | be32_to_cpu(ti.track_size); |
| 1399 | if (ti.free_blocks) |
| 1400 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); |
| 1401 | } |
| 1402 | return 0; |
| 1403 | } |
| 1404 | |
| 1405 | /* |
| 1406 | * write mode select package based on pd->settings |
| 1407 | */ |
| 1408 | static int pkt_set_write_settings(struct pktcdvd_device *pd) |
| 1409 | { |
| 1410 | struct packet_command cgc; |
| 1411 | struct request_sense sense; |
| 1412 | write_param_page *wp; |
| 1413 | char buffer[128]; |
| 1414 | int ret, size; |
| 1415 | |
| 1416 | /* doesn't apply to DVD+RW or DVD-RAM */ |
| 1417 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) |
| 1418 | return 0; |
| 1419 | |
| 1420 | memset(buffer, 0, sizeof(buffer)); |
| 1421 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); |
| 1422 | cgc.sense = &sense; |
| 1423 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 1424 | pkt_dump_sense(&cgc); |
| 1425 | return ret; |
| 1426 | } |
| 1427 | |
| 1428 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); |
| 1429 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); |
| 1430 | if (size > sizeof(buffer)) |
| 1431 | size = sizeof(buffer); |
| 1432 | |
| 1433 | /* |
| 1434 | * now get it all |
| 1435 | */ |
| 1436 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); |
| 1437 | cgc.sense = &sense; |
| 1438 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 1439 | pkt_dump_sense(&cgc); |
| 1440 | return ret; |
| 1441 | } |
| 1442 | |
| 1443 | /* |
| 1444 | * write page is offset header + block descriptor length |
| 1445 | */ |
| 1446 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; |
| 1447 | |
| 1448 | wp->fp = pd->settings.fp; |
| 1449 | wp->track_mode = pd->settings.track_mode; |
| 1450 | wp->write_type = pd->settings.write_type; |
| 1451 | wp->data_block_type = pd->settings.block_mode; |
| 1452 | |
| 1453 | wp->multi_session = 0; |
| 1454 | |
| 1455 | #ifdef PACKET_USE_LS |
| 1456 | wp->link_size = 7; |
| 1457 | wp->ls_v = 1; |
| 1458 | #endif |
| 1459 | |
| 1460 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { |
| 1461 | wp->session_format = 0; |
| 1462 | wp->subhdr2 = 0x20; |
| 1463 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { |
| 1464 | wp->session_format = 0x20; |
| 1465 | wp->subhdr2 = 8; |
| 1466 | #if 0 |
| 1467 | wp->mcn[0] = 0x80; |
| 1468 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); |
| 1469 | #endif |
| 1470 | } else { |
| 1471 | /* |
| 1472 | * paranoia |
| 1473 | */ |
| 1474 | printk("pktcdvd: write mode wrong %d\n", wp->data_block_type); |
| 1475 | return 1; |
| 1476 | } |
| 1477 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); |
| 1478 | |
| 1479 | cgc.buflen = cgc.cmd[8] = size; |
| 1480 | if ((ret = pkt_mode_select(pd, &cgc))) { |
| 1481 | pkt_dump_sense(&cgc); |
| 1482 | return ret; |
| 1483 | } |
| 1484 | |
| 1485 | pkt_print_settings(pd); |
| 1486 | return 0; |
| 1487 | } |
| 1488 | |
| 1489 | /* |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1490 | * 1 -- we can write to this track, 0 -- we can't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | */ |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1492 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | { |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1494 | switch (pd->mmc3_profile) { |
| 1495 | case 0x1a: /* DVD+RW */ |
| 1496 | case 0x12: /* DVD-RAM */ |
| 1497 | /* The track is always writable on DVD+RW/DVD-RAM */ |
| 1498 | return 1; |
| 1499 | default: |
| 1500 | break; |
| 1501 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1503 | if (!ti->packet || !ti->fp) |
| 1504 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | |
| 1506 | /* |
| 1507 | * "good" settings as per Mt Fuji. |
| 1508 | */ |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1509 | if (ti->rt == 0 && ti->blank == 0) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1510 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1512 | if (ti->rt == 0 && ti->blank == 1) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1513 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1515 | if (ti->rt == 1 && ti->blank == 0) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1516 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
| 1518 | printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1519 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | } |
| 1521 | |
| 1522 | /* |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1523 | * 1 -- we can write to this disc, 0 -- we can't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | */ |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1525 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | { |
| 1527 | switch (pd->mmc3_profile) { |
| 1528 | case 0x0a: /* CD-RW */ |
| 1529 | case 0xffff: /* MMC3 not supported */ |
| 1530 | break; |
| 1531 | case 0x1a: /* DVD+RW */ |
| 1532 | case 0x13: /* DVD-RW */ |
| 1533 | case 0x12: /* DVD-RAM */ |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1534 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | default: |
Peter Osterlund | 61a3493 | 2006-02-14 13:52:54 -0800 | [diff] [blame] | 1536 | VPRINTK("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1537 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * for disc type 0xff we should probably reserve a new track. |
| 1542 | * but i'm not sure, should we leave this to user apps? probably. |
| 1543 | */ |
| 1544 | if (di->disc_type == 0xff) { |
| 1545 | printk("pktcdvd: Unknown disc. No track?\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1546 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | if (di->disc_type != 0x20 && di->disc_type != 0) { |
| 1550 | printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
| 1553 | |
| 1554 | if (di->erasable == 0) { |
| 1555 | printk("pktcdvd: Disc not erasable\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1556 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | } |
| 1558 | |
| 1559 | if (di->border_status == PACKET_SESSION_RESERVED) { |
| 1560 | printk("pktcdvd: Can't write to last track (reserved)\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1561 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | } |
| 1563 | |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1564 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | } |
| 1566 | |
| 1567 | static int pkt_probe_settings(struct pktcdvd_device *pd) |
| 1568 | { |
| 1569 | struct packet_command cgc; |
| 1570 | unsigned char buf[12]; |
| 1571 | disc_information di; |
| 1572 | track_information ti; |
| 1573 | int ret, track; |
| 1574 | |
| 1575 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
| 1576 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; |
| 1577 | cgc.cmd[8] = 8; |
| 1578 | ret = pkt_generic_packet(pd, &cgc); |
| 1579 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; |
| 1580 | |
| 1581 | memset(&di, 0, sizeof(disc_information)); |
| 1582 | memset(&ti, 0, sizeof(track_information)); |
| 1583 | |
| 1584 | if ((ret = pkt_get_disc_info(pd, &di))) { |
| 1585 | printk("failed get_disc\n"); |
| 1586 | return ret; |
| 1587 | } |
| 1588 | |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1589 | if (!pkt_writable_disc(pd, &di)) |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1590 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
| 1593 | |
| 1594 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ |
| 1595 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { |
| 1596 | printk("pktcdvd: failed get_track\n"); |
| 1597 | return ret; |
| 1598 | } |
| 1599 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1600 | if (!pkt_writable_track(pd, &ti)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | printk("pktcdvd: can't write to this track\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1602 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | } |
| 1604 | |
| 1605 | /* |
| 1606 | * we keep packet size in 512 byte units, makes it easier to |
| 1607 | * deal with request calculations. |
| 1608 | */ |
| 1609 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; |
| 1610 | if (pd->settings.size == 0) { |
| 1611 | printk("pktcdvd: detected zero packet size!\n"); |
Phillip Susi | a460ad6 | 2006-02-04 23:27:44 -0800 | [diff] [blame] | 1612 | return -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | } |
Peter Osterlund | d0272e7 | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 1614 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
| 1615 | printk("pktcdvd: packet size is too big\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1616 | return -EROFS; |
Peter Osterlund | d0272e7 | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 1617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | pd->settings.fp = ti.fp; |
| 1619 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); |
| 1620 | |
| 1621 | if (ti.nwa_v) { |
| 1622 | pd->nwa = be32_to_cpu(ti.next_writable); |
| 1623 | set_bit(PACKET_NWA_VALID, &pd->flags); |
| 1624 | } |
| 1625 | |
| 1626 | /* |
| 1627 | * in theory we could use lra on -RW media as well and just zero |
| 1628 | * blocks that haven't been written yet, but in practice that |
| 1629 | * is just a no-go. we'll use that for -R, naturally. |
| 1630 | */ |
| 1631 | if (ti.lra_v) { |
| 1632 | pd->lra = be32_to_cpu(ti.last_rec_address); |
| 1633 | set_bit(PACKET_LRA_VALID, &pd->flags); |
| 1634 | } else { |
| 1635 | pd->lra = 0xffffffff; |
| 1636 | set_bit(PACKET_LRA_VALID, &pd->flags); |
| 1637 | } |
| 1638 | |
| 1639 | /* |
| 1640 | * fine for now |
| 1641 | */ |
| 1642 | pd->settings.link_loss = 7; |
| 1643 | pd->settings.write_type = 0; /* packet */ |
| 1644 | pd->settings.track_mode = ti.track_mode; |
| 1645 | |
| 1646 | /* |
| 1647 | * mode1 or mode2 disc |
| 1648 | */ |
| 1649 | switch (ti.data_mode) { |
| 1650 | case PACKET_MODE1: |
| 1651 | pd->settings.block_mode = PACKET_BLOCK_MODE1; |
| 1652 | break; |
| 1653 | case PACKET_MODE2: |
| 1654 | pd->settings.block_mode = PACKET_BLOCK_MODE2; |
| 1655 | break; |
| 1656 | default: |
| 1657 | printk("pktcdvd: unknown data mode\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1658 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | } |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
| 1663 | /* |
| 1664 | * enable/disable write caching on drive |
| 1665 | */ |
| 1666 | static int pkt_write_caching(struct pktcdvd_device *pd, int set) |
| 1667 | { |
| 1668 | struct packet_command cgc; |
| 1669 | struct request_sense sense; |
| 1670 | unsigned char buf[64]; |
| 1671 | int ret; |
| 1672 | |
| 1673 | memset(buf, 0, sizeof(buf)); |
| 1674 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
| 1675 | cgc.sense = &sense; |
| 1676 | cgc.buflen = pd->mode_offset + 12; |
| 1677 | |
| 1678 | /* |
| 1679 | * caching mode page might not be there, so quiet this command |
| 1680 | */ |
| 1681 | cgc.quiet = 1; |
| 1682 | |
| 1683 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) |
| 1684 | return ret; |
| 1685 | |
| 1686 | buf[pd->mode_offset + 10] |= (!!set << 2); |
| 1687 | |
| 1688 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); |
| 1689 | ret = pkt_mode_select(pd, &cgc); |
| 1690 | if (ret) { |
| 1691 | printk("pktcdvd: write caching control failed\n"); |
| 1692 | pkt_dump_sense(&cgc); |
| 1693 | } else if (!ret && set) |
| 1694 | printk("pktcdvd: enabled write caching on %s\n", pd->name); |
| 1695 | return ret; |
| 1696 | } |
| 1697 | |
| 1698 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) |
| 1699 | { |
| 1700 | struct packet_command cgc; |
| 1701 | |
| 1702 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 1703 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; |
| 1704 | cgc.cmd[4] = lockflag ? 1 : 0; |
| 1705 | return pkt_generic_packet(pd, &cgc); |
| 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | * Returns drive maximum write speed |
| 1710 | */ |
| 1711 | static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed) |
| 1712 | { |
| 1713 | struct packet_command cgc; |
| 1714 | struct request_sense sense; |
| 1715 | unsigned char buf[256+18]; |
| 1716 | unsigned char *cap_buf; |
| 1717 | int ret, offset; |
| 1718 | |
| 1719 | memset(buf, 0, sizeof(buf)); |
| 1720 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
| 1721 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); |
| 1722 | cgc.sense = &sense; |
| 1723 | |
| 1724 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
| 1725 | if (ret) { |
| 1726 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + |
| 1727 | sizeof(struct mode_page_header); |
| 1728 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
| 1729 | if (ret) { |
| 1730 | pkt_dump_sense(&cgc); |
| 1731 | return ret; |
| 1732 | } |
| 1733 | } |
| 1734 | |
| 1735 | offset = 20; /* Obsoleted field, used by older drives */ |
| 1736 | if (cap_buf[1] >= 28) |
| 1737 | offset = 28; /* Current write speed selected */ |
| 1738 | if (cap_buf[1] >= 30) { |
| 1739 | /* If the drive reports at least one "Logical Unit Write |
| 1740 | * Speed Performance Descriptor Block", use the information |
| 1741 | * in the first block. (contains the highest speed) |
| 1742 | */ |
| 1743 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; |
| 1744 | if (num_spdb > 0) |
| 1745 | offset = 34; |
| 1746 | } |
| 1747 | |
| 1748 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; |
| 1749 | return 0; |
| 1750 | } |
| 1751 | |
| 1752 | /* These tables from cdrecord - I don't have orange book */ |
| 1753 | /* standard speed CD-RW (1-4x) */ |
| 1754 | static char clv_to_speed[16] = { |
| 1755 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 1756 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 1757 | }; |
| 1758 | /* high speed CD-RW (-10x) */ |
| 1759 | static char hs_clv_to_speed[16] = { |
| 1760 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 1761 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 1762 | }; |
| 1763 | /* ultra high speed CD-RW */ |
| 1764 | static char us_clv_to_speed[16] = { |
| 1765 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 1766 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 |
| 1767 | }; |
| 1768 | |
| 1769 | /* |
| 1770 | * reads the maximum media speed from ATIP |
| 1771 | */ |
| 1772 | static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed) |
| 1773 | { |
| 1774 | struct packet_command cgc; |
| 1775 | struct request_sense sense; |
| 1776 | unsigned char buf[64]; |
| 1777 | unsigned int size, st, sp; |
| 1778 | int ret; |
| 1779 | |
| 1780 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); |
| 1781 | cgc.sense = &sense; |
| 1782 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
| 1783 | cgc.cmd[1] = 2; |
| 1784 | cgc.cmd[2] = 4; /* READ ATIP */ |
| 1785 | cgc.cmd[8] = 2; |
| 1786 | ret = pkt_generic_packet(pd, &cgc); |
| 1787 | if (ret) { |
| 1788 | pkt_dump_sense(&cgc); |
| 1789 | return ret; |
| 1790 | } |
| 1791 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; |
| 1792 | if (size > sizeof(buf)) |
| 1793 | size = sizeof(buf); |
| 1794 | |
| 1795 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); |
| 1796 | cgc.sense = &sense; |
| 1797 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
| 1798 | cgc.cmd[1] = 2; |
| 1799 | cgc.cmd[2] = 4; |
| 1800 | cgc.cmd[8] = size; |
| 1801 | ret = pkt_generic_packet(pd, &cgc); |
| 1802 | if (ret) { |
| 1803 | pkt_dump_sense(&cgc); |
| 1804 | return ret; |
| 1805 | } |
| 1806 | |
| 1807 | if (!buf[6] & 0x40) { |
| 1808 | printk("pktcdvd: Disc type is not CD-RW\n"); |
| 1809 | return 1; |
| 1810 | } |
| 1811 | if (!buf[6] & 0x4) { |
| 1812 | printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n"); |
| 1813 | return 1; |
| 1814 | } |
| 1815 | |
| 1816 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ |
| 1817 | |
| 1818 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ |
| 1819 | |
| 1820 | /* Info from cdrecord */ |
| 1821 | switch (st) { |
| 1822 | case 0: /* standard speed */ |
| 1823 | *speed = clv_to_speed[sp]; |
| 1824 | break; |
| 1825 | case 1: /* high speed */ |
| 1826 | *speed = hs_clv_to_speed[sp]; |
| 1827 | break; |
| 1828 | case 2: /* ultra high speed */ |
| 1829 | *speed = us_clv_to_speed[sp]; |
| 1830 | break; |
| 1831 | default: |
| 1832 | printk("pktcdvd: Unknown disc sub-type %d\n",st); |
| 1833 | return 1; |
| 1834 | } |
| 1835 | if (*speed) { |
| 1836 | printk("pktcdvd: Max. media speed: %d\n",*speed); |
| 1837 | return 0; |
| 1838 | } else { |
| 1839 | printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st); |
| 1840 | return 1; |
| 1841 | } |
| 1842 | } |
| 1843 | |
| 1844 | static int pkt_perform_opc(struct pktcdvd_device *pd) |
| 1845 | { |
| 1846 | struct packet_command cgc; |
| 1847 | struct request_sense sense; |
| 1848 | int ret; |
| 1849 | |
| 1850 | VPRINTK("pktcdvd: Performing OPC\n"); |
| 1851 | |
| 1852 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 1853 | cgc.sense = &sense; |
| 1854 | cgc.timeout = 60*HZ; |
| 1855 | cgc.cmd[0] = GPCMD_SEND_OPC; |
| 1856 | cgc.cmd[1] = 1; |
| 1857 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 1858 | pkt_dump_sense(&cgc); |
| 1859 | return ret; |
| 1860 | } |
| 1861 | |
| 1862 | static int pkt_open_write(struct pktcdvd_device *pd) |
| 1863 | { |
| 1864 | int ret; |
| 1865 | unsigned int write_speed, media_write_speed, read_speed; |
| 1866 | |
| 1867 | if ((ret = pkt_probe_settings(pd))) { |
Peter Osterlund | 61a3493 | 2006-02-14 13:52:54 -0800 | [diff] [blame] | 1868 | VPRINTK("pktcdvd: %s failed probe\n", pd->name); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1869 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | } |
| 1871 | |
| 1872 | if ((ret = pkt_set_write_settings(pd))) { |
| 1873 | DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name); |
| 1874 | return -EIO; |
| 1875 | } |
| 1876 | |
| 1877 | pkt_write_caching(pd, USE_WCACHING); |
| 1878 | |
| 1879 | if ((ret = pkt_get_max_speed(pd, &write_speed))) |
| 1880 | write_speed = 16 * 177; |
| 1881 | switch (pd->mmc3_profile) { |
| 1882 | case 0x13: /* DVD-RW */ |
| 1883 | case 0x1a: /* DVD+RW */ |
| 1884 | case 0x12: /* DVD-RAM */ |
| 1885 | DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed); |
| 1886 | break; |
| 1887 | default: |
| 1888 | if ((ret = pkt_media_speed(pd, &media_write_speed))) |
| 1889 | media_write_speed = 16; |
| 1890 | write_speed = min(write_speed, media_write_speed * 177); |
| 1891 | DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176); |
| 1892 | break; |
| 1893 | } |
| 1894 | read_speed = write_speed; |
| 1895 | |
| 1896 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { |
| 1897 | DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name); |
| 1898 | return -EIO; |
| 1899 | } |
| 1900 | pd->write_speed = write_speed; |
| 1901 | pd->read_speed = read_speed; |
| 1902 | |
| 1903 | if ((ret = pkt_perform_opc(pd))) { |
| 1904 | DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name); |
| 1905 | } |
| 1906 | |
| 1907 | return 0; |
| 1908 | } |
| 1909 | |
| 1910 | /* |
| 1911 | * called at open time. |
| 1912 | */ |
| 1913 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) |
| 1914 | { |
| 1915 | int ret; |
| 1916 | long lba; |
| 1917 | request_queue_t *q; |
| 1918 | |
| 1919 | /* |
| 1920 | * We need to re-open the cdrom device without O_NONBLOCK to be able |
| 1921 | * to read/write from/to it. It is already opened in O_NONBLOCK mode |
| 1922 | * so bdget() can't fail. |
| 1923 | */ |
| 1924 | bdget(pd->bdev->bd_dev); |
| 1925 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) |
| 1926 | goto out; |
| 1927 | |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1928 | if ((ret = bd_claim(pd->bdev, pd))) |
| 1929 | goto out_putdev; |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | if ((ret = pkt_get_last_written(pd, &lba))) { |
| 1932 | printk("pktcdvd: pkt_get_last_written failed\n"); |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1933 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | } |
| 1935 | |
| 1936 | set_capacity(pd->disk, lba << 2); |
| 1937 | set_capacity(pd->bdev->bd_disk, lba << 2); |
| 1938 | bd_set_size(pd->bdev, (loff_t)lba << 11); |
| 1939 | |
| 1940 | q = bdev_get_queue(pd->bdev); |
| 1941 | if (write) { |
| 1942 | if ((ret = pkt_open_write(pd))) |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1943 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | /* |
| 1945 | * Some CDRW drives can not handle writes larger than one packet, |
| 1946 | * even if the size is a multiple of the packet size. |
| 1947 | */ |
| 1948 | spin_lock_irq(q->queue_lock); |
| 1949 | blk_queue_max_sectors(q, pd->settings.size); |
| 1950 | spin_unlock_irq(q->queue_lock); |
| 1951 | set_bit(PACKET_WRITABLE, &pd->flags); |
| 1952 | } else { |
| 1953 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
| 1954 | clear_bit(PACKET_WRITABLE, &pd->flags); |
| 1955 | } |
| 1956 | |
| 1957 | if ((ret = pkt_set_segment_merging(pd, q))) |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1958 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 1960 | if (write) { |
| 1961 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { |
| 1962 | printk("pktcdvd: not enough memory for buffers\n"); |
| 1963 | ret = -ENOMEM; |
| 1964 | goto out_unclaim; |
| 1965 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | printk("pktcdvd: %lukB available on disc\n", lba << 1); |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 1967 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | |
| 1969 | return 0; |
| 1970 | |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1971 | out_unclaim: |
| 1972 | bd_release(pd->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | out_putdev: |
| 1974 | blkdev_put(pd->bdev); |
| 1975 | out: |
| 1976 | return ret; |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * called when the device is closed. makes sure that the device flushes |
| 1981 | * the internal cache before we close. |
| 1982 | */ |
| 1983 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) |
| 1984 | { |
| 1985 | if (flush && pkt_flush_cache(pd)) |
| 1986 | DPRINTK("pktcdvd: %s not flushing cache\n", pd->name); |
| 1987 | |
| 1988 | pkt_lock_door(pd, 0); |
| 1989 | |
| 1990 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 1991 | bd_release(pd->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | blkdev_put(pd->bdev); |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 1993 | |
| 1994 | pkt_shrink_pktlist(pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | } |
| 1996 | |
| 1997 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) |
| 1998 | { |
| 1999 | if (dev_minor >= MAX_WRITERS) |
| 2000 | return NULL; |
| 2001 | return pkt_devs[dev_minor]; |
| 2002 | } |
| 2003 | |
| 2004 | static int pkt_open(struct inode *inode, struct file *file) |
| 2005 | { |
| 2006 | struct pktcdvd_device *pd = NULL; |
| 2007 | int ret; |
| 2008 | |
| 2009 | VPRINTK("pktcdvd: entering open\n"); |
| 2010 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2011 | mutex_lock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | pd = pkt_find_dev_from_minor(iminor(inode)); |
| 2013 | if (!pd) { |
| 2014 | ret = -ENODEV; |
| 2015 | goto out; |
| 2016 | } |
| 2017 | BUG_ON(pd->refcnt < 0); |
| 2018 | |
| 2019 | pd->refcnt++; |
Peter Osterlund | 46f4e1b | 2005-05-20 13:59:06 -0700 | [diff] [blame] | 2020 | if (pd->refcnt > 1) { |
| 2021 | if ((file->f_mode & FMODE_WRITE) && |
| 2022 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
| 2023 | ret = -EBUSY; |
| 2024 | goto out_dec; |
| 2025 | } |
| 2026 | } else { |
Peter Osterlund | 01fd9fd | 2006-02-14 13:52:55 -0800 | [diff] [blame] | 2027 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); |
| 2028 | if (ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | goto out_dec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | /* |
| 2031 | * needed here as well, since ext2 (among others) may change |
| 2032 | * the blocksize at mount time |
| 2033 | */ |
| 2034 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); |
| 2035 | } |
| 2036 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2037 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | return 0; |
| 2039 | |
| 2040 | out_dec: |
| 2041 | pd->refcnt--; |
| 2042 | out: |
| 2043 | VPRINTK("pktcdvd: failed open (%d)\n", ret); |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2044 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | return ret; |
| 2046 | } |
| 2047 | |
| 2048 | static int pkt_close(struct inode *inode, struct file *file) |
| 2049 | { |
| 2050 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; |
| 2051 | int ret = 0; |
| 2052 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2053 | mutex_lock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | pd->refcnt--; |
| 2055 | BUG_ON(pd->refcnt < 0); |
| 2056 | if (pd->refcnt == 0) { |
| 2057 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); |
| 2058 | pkt_release_dev(pd, flush); |
| 2059 | } |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2060 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | return ret; |
| 2062 | } |
| 2063 | |
| 2064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err) |
| 2066 | { |
| 2067 | struct packet_stacked_data *psd = bio->bi_private; |
| 2068 | struct pktcdvd_device *pd = psd->pd; |
| 2069 | |
| 2070 | if (bio->bi_size) |
| 2071 | return 1; |
| 2072 | |
| 2073 | bio_put(bio); |
| 2074 | bio_endio(psd->bio, psd->bio->bi_size, err); |
| 2075 | mempool_free(psd, psd_pool); |
| 2076 | pkt_bio_finished(pd); |
| 2077 | return 0; |
| 2078 | } |
| 2079 | |
| 2080 | static int pkt_make_request(request_queue_t *q, struct bio *bio) |
| 2081 | { |
| 2082 | struct pktcdvd_device *pd; |
| 2083 | char b[BDEVNAME_SIZE]; |
| 2084 | sector_t zone; |
| 2085 | struct packet_data *pkt; |
| 2086 | int was_empty, blocked_bio; |
| 2087 | struct pkt_rb_node *node; |
| 2088 | |
| 2089 | pd = q->queuedata; |
| 2090 | if (!pd) { |
| 2091 | printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
| 2092 | goto end_io; |
| 2093 | } |
| 2094 | |
| 2095 | /* |
| 2096 | * Clone READ bios so we can have our own bi_end_io callback. |
| 2097 | */ |
| 2098 | if (bio_data_dir(bio) == READ) { |
| 2099 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
| 2100 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); |
| 2101 | |
| 2102 | psd->pd = pd; |
| 2103 | psd->bio = bio; |
| 2104 | cloned_bio->bi_bdev = pd->bdev; |
| 2105 | cloned_bio->bi_private = psd; |
| 2106 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; |
| 2107 | pd->stats.secs_r += bio->bi_size >> 9; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 2108 | pkt_queue_bio(pd, cloned_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | return 0; |
| 2110 | } |
| 2111 | |
| 2112 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { |
| 2113 | printk("pktcdvd: WRITE for ro device %s (%llu)\n", |
| 2114 | pd->name, (unsigned long long)bio->bi_sector); |
| 2115 | goto end_io; |
| 2116 | } |
| 2117 | |
| 2118 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { |
| 2119 | printk("pktcdvd: wrong bio size\n"); |
| 2120 | goto end_io; |
| 2121 | } |
| 2122 | |
| 2123 | blk_queue_bounce(q, &bio); |
| 2124 | |
| 2125 | zone = ZONE(bio->bi_sector, pd); |
| 2126 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", |
| 2127 | (unsigned long long)bio->bi_sector, |
| 2128 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); |
| 2129 | |
| 2130 | /* Check if we have to split the bio */ |
| 2131 | { |
| 2132 | struct bio_pair *bp; |
| 2133 | sector_t last_zone; |
| 2134 | int first_sectors; |
| 2135 | |
| 2136 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); |
| 2137 | if (last_zone != zone) { |
| 2138 | BUG_ON(last_zone != zone + pd->settings.size); |
| 2139 | first_sectors = last_zone - bio->bi_sector; |
| 2140 | bp = bio_split(bio, bio_split_pool, first_sectors); |
| 2141 | BUG_ON(!bp); |
| 2142 | pkt_make_request(q, &bp->bio1); |
| 2143 | pkt_make_request(q, &bp->bio2); |
| 2144 | bio_pair_release(bp); |
| 2145 | return 0; |
| 2146 | } |
| 2147 | } |
| 2148 | |
| 2149 | /* |
| 2150 | * If we find a matching packet in state WAITING or READ_WAIT, we can |
| 2151 | * just append this bio to that packet. |
| 2152 | */ |
| 2153 | spin_lock(&pd->cdrw.active_list_lock); |
| 2154 | blocked_bio = 0; |
| 2155 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 2156 | if (pkt->sector == zone) { |
| 2157 | spin_lock(&pkt->lock); |
| 2158 | if ((pkt->state == PACKET_WAITING_STATE) || |
| 2159 | (pkt->state == PACKET_READ_WAIT_STATE)) { |
| 2160 | pkt_add_list_last(bio, &pkt->orig_bios, |
| 2161 | &pkt->orig_bios_tail); |
| 2162 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
| 2163 | if ((pkt->write_size >= pkt->frames) && |
| 2164 | (pkt->state == PACKET_WAITING_STATE)) { |
| 2165 | atomic_inc(&pkt->run_sm); |
| 2166 | wake_up(&pd->wqueue); |
| 2167 | } |
| 2168 | spin_unlock(&pkt->lock); |
| 2169 | spin_unlock(&pd->cdrw.active_list_lock); |
| 2170 | return 0; |
| 2171 | } else { |
| 2172 | blocked_bio = 1; |
| 2173 | } |
| 2174 | spin_unlock(&pkt->lock); |
| 2175 | } |
| 2176 | } |
| 2177 | spin_unlock(&pd->cdrw.active_list_lock); |
| 2178 | |
| 2179 | /* |
| 2180 | * No matching packet found. Store the bio in the work queue. |
| 2181 | */ |
| 2182 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | node->bio = bio; |
| 2184 | spin_lock(&pd->lock); |
| 2185 | BUG_ON(pd->bio_queue_size < 0); |
| 2186 | was_empty = (pd->bio_queue_size == 0); |
| 2187 | pkt_rbtree_insert(pd, node); |
| 2188 | spin_unlock(&pd->lock); |
| 2189 | |
| 2190 | /* |
| 2191 | * Wake up the worker thread. |
| 2192 | */ |
| 2193 | atomic_set(&pd->scan_queue, 1); |
| 2194 | if (was_empty) { |
| 2195 | /* This wake_up is required for correct operation */ |
| 2196 | wake_up(&pd->wqueue); |
| 2197 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { |
| 2198 | /* |
| 2199 | * This wake up is not required for correct operation, |
| 2200 | * but improves performance in some cases. |
| 2201 | */ |
| 2202 | wake_up(&pd->wqueue); |
| 2203 | } |
| 2204 | return 0; |
| 2205 | end_io: |
| 2206 | bio_io_error(bio, bio->bi_size); |
| 2207 | return 0; |
| 2208 | } |
| 2209 | |
| 2210 | |
| 2211 | |
| 2212 | static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec) |
| 2213 | { |
| 2214 | struct pktcdvd_device *pd = q->queuedata; |
| 2215 | sector_t zone = ZONE(bio->bi_sector, pd); |
| 2216 | int used = ((bio->bi_sector - zone) << 9) + bio->bi_size; |
| 2217 | int remaining = (pd->settings.size << 9) - used; |
| 2218 | int remaining2; |
| 2219 | |
| 2220 | /* |
| 2221 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet |
| 2222 | * boundary, pkt_make_request() will split the bio. |
| 2223 | */ |
| 2224 | remaining2 = PAGE_SIZE - bio->bi_size; |
| 2225 | remaining = max(remaining, remaining2); |
| 2226 | |
| 2227 | BUG_ON(remaining < 0); |
| 2228 | return remaining; |
| 2229 | } |
| 2230 | |
| 2231 | static void pkt_init_queue(struct pktcdvd_device *pd) |
| 2232 | { |
| 2233 | request_queue_t *q = pd->disk->queue; |
| 2234 | |
| 2235 | blk_queue_make_request(q, pkt_make_request); |
| 2236 | blk_queue_hardsect_size(q, CD_FRAMESIZE); |
| 2237 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); |
| 2238 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
| 2239 | q->queuedata = pd; |
| 2240 | } |
| 2241 | |
| 2242 | static int pkt_seq_show(struct seq_file *m, void *p) |
| 2243 | { |
| 2244 | struct pktcdvd_device *pd = m->private; |
| 2245 | char *msg; |
| 2246 | char bdev_buf[BDEVNAME_SIZE]; |
| 2247 | int states[PACKET_NUM_STATES]; |
| 2248 | |
| 2249 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, |
| 2250 | bdevname(pd->bdev, bdev_buf)); |
| 2251 | |
| 2252 | seq_printf(m, "\nSettings:\n"); |
| 2253 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); |
| 2254 | |
| 2255 | if (pd->settings.write_type == 0) |
| 2256 | msg = "Packet"; |
| 2257 | else |
| 2258 | msg = "Unknown"; |
| 2259 | seq_printf(m, "\twrite type:\t\t%s\n", msg); |
| 2260 | |
| 2261 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); |
| 2262 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); |
| 2263 | |
| 2264 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); |
| 2265 | |
| 2266 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) |
| 2267 | msg = "Mode 1"; |
| 2268 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) |
| 2269 | msg = "Mode 2"; |
| 2270 | else |
| 2271 | msg = "Unknown"; |
| 2272 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); |
| 2273 | |
| 2274 | seq_printf(m, "\nStatistics:\n"); |
| 2275 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); |
| 2276 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); |
| 2277 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); |
| 2278 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); |
| 2279 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); |
| 2280 | |
| 2281 | seq_printf(m, "\nMisc:\n"); |
| 2282 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); |
| 2283 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); |
| 2284 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); |
| 2285 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); |
| 2286 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); |
| 2287 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); |
| 2288 | |
| 2289 | seq_printf(m, "\nQueue state:\n"); |
| 2290 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); |
| 2291 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); |
| 2292 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); |
| 2293 | |
| 2294 | pkt_count_states(pd, states); |
| 2295 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
| 2296 | states[0], states[1], states[2], states[3], states[4], states[5]); |
| 2297 | |
| 2298 | return 0; |
| 2299 | } |
| 2300 | |
| 2301 | static int pkt_seq_open(struct inode *inode, struct file *file) |
| 2302 | { |
| 2303 | return single_open(file, pkt_seq_show, PDE(inode)->data); |
| 2304 | } |
| 2305 | |
| 2306 | static struct file_operations pkt_proc_fops = { |
| 2307 | .open = pkt_seq_open, |
| 2308 | .read = seq_read, |
| 2309 | .llseek = seq_lseek, |
| 2310 | .release = single_release |
| 2311 | }; |
| 2312 | |
| 2313 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
| 2314 | { |
| 2315 | int i; |
| 2316 | int ret = 0; |
| 2317 | char b[BDEVNAME_SIZE]; |
| 2318 | struct proc_dir_entry *proc; |
| 2319 | struct block_device *bdev; |
| 2320 | |
| 2321 | if (pd->pkt_dev == dev) { |
| 2322 | printk("pktcdvd: Recursive setup not allowed\n"); |
| 2323 | return -EBUSY; |
| 2324 | } |
| 2325 | for (i = 0; i < MAX_WRITERS; i++) { |
| 2326 | struct pktcdvd_device *pd2 = pkt_devs[i]; |
| 2327 | if (!pd2) |
| 2328 | continue; |
| 2329 | if (pd2->bdev->bd_dev == dev) { |
| 2330 | printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b)); |
| 2331 | return -EBUSY; |
| 2332 | } |
| 2333 | if (pd2->pkt_dev == dev) { |
| 2334 | printk("pktcdvd: Can't chain pktcdvd devices\n"); |
| 2335 | return -EBUSY; |
| 2336 | } |
| 2337 | } |
| 2338 | |
| 2339 | bdev = bdget(dev); |
| 2340 | if (!bdev) |
| 2341 | return -ENOMEM; |
| 2342 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); |
| 2343 | if (ret) |
| 2344 | return ret; |
| 2345 | |
| 2346 | /* This is safe, since we have a reference from open(). */ |
| 2347 | __module_get(THIS_MODULE); |
| 2348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | pd->bdev = bdev; |
| 2350 | set_blocksize(bdev, CD_FRAMESIZE); |
| 2351 | |
| 2352 | pkt_init_queue(pd); |
| 2353 | |
| 2354 | atomic_set(&pd->cdrw.pending_bios, 0); |
| 2355 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); |
| 2356 | if (IS_ERR(pd->cdrw.thread)) { |
| 2357 | printk("pktcdvd: can't start kernel thread\n"); |
| 2358 | ret = -ENOMEM; |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2359 | goto out_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | } |
| 2361 | |
| 2362 | proc = create_proc_entry(pd->name, 0, pkt_proc); |
| 2363 | if (proc) { |
| 2364 | proc->data = pd; |
| 2365 | proc->proc_fops = &pkt_proc_fops; |
| 2366 | } |
| 2367 | DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
| 2368 | return 0; |
| 2369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | out_mem: |
| 2371 | blkdev_put(bdev); |
| 2372 | /* This is safe: open() is still holding a reference. */ |
| 2373 | module_put(THIS_MODULE); |
| 2374 | return ret; |
| 2375 | } |
| 2376 | |
| 2377 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
| 2378 | { |
| 2379 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; |
| 2380 | |
| 2381 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | |
| 2383 | switch (cmd) { |
| 2384 | /* |
| 2385 | * forward selected CDROM ioctls to CD-ROM, for UDF |
| 2386 | */ |
| 2387 | case CDROMMULTISESSION: |
| 2388 | case CDROMREADTOCENTRY: |
| 2389 | case CDROM_LAST_WRITTEN: |
| 2390 | case CDROM_SEND_PACKET: |
| 2391 | case SCSI_IOCTL_SEND_COMMAND: |
Peter Osterlund | 118326e | 2005-05-14 00:58:30 -0700 | [diff] [blame] | 2392 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | |
| 2394 | case CDROMEJECT: |
| 2395 | /* |
| 2396 | * The door gets locked when the device is opened, so we |
| 2397 | * have to unlock it or else the eject command fails. |
| 2398 | */ |
Peter Osterlund | 948423e | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 2399 | if (pd->refcnt == 1) |
| 2400 | pkt_lock_door(pd, 0); |
Peter Osterlund | 118326e | 2005-05-14 00:58:30 -0700 | [diff] [blame] | 2401 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | |
| 2403 | default: |
Peter Osterlund | 61a3493 | 2006-02-14 13:52:54 -0800 | [diff] [blame] | 2404 | VPRINTK("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | return -ENOTTY; |
| 2406 | } |
| 2407 | |
| 2408 | return 0; |
| 2409 | } |
| 2410 | |
| 2411 | static int pkt_media_changed(struct gendisk *disk) |
| 2412 | { |
| 2413 | struct pktcdvd_device *pd = disk->private_data; |
| 2414 | struct gendisk *attached_disk; |
| 2415 | |
| 2416 | if (!pd) |
| 2417 | return 0; |
| 2418 | if (!pd->bdev) |
| 2419 | return 0; |
| 2420 | attached_disk = pd->bdev->bd_disk; |
| 2421 | if (!attached_disk) |
| 2422 | return 0; |
| 2423 | return attached_disk->fops->media_changed(attached_disk); |
| 2424 | } |
| 2425 | |
| 2426 | static struct block_device_operations pktcdvd_ops = { |
| 2427 | .owner = THIS_MODULE, |
| 2428 | .open = pkt_open, |
| 2429 | .release = pkt_close, |
| 2430 | .ioctl = pkt_ioctl, |
| 2431 | .media_changed = pkt_media_changed, |
| 2432 | }; |
| 2433 | |
| 2434 | /* |
| 2435 | * Set up mapping from pktcdvd device to CD-ROM device. |
| 2436 | */ |
| 2437 | static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd) |
| 2438 | { |
| 2439 | int idx; |
| 2440 | int ret = -ENOMEM; |
| 2441 | struct pktcdvd_device *pd; |
| 2442 | struct gendisk *disk; |
| 2443 | dev_t dev = new_decode_dev(ctrl_cmd->dev); |
| 2444 | |
| 2445 | for (idx = 0; idx < MAX_WRITERS; idx++) |
| 2446 | if (!pkt_devs[idx]) |
| 2447 | break; |
| 2448 | if (idx == MAX_WRITERS) { |
| 2449 | printk("pktcdvd: max %d writers supported\n", MAX_WRITERS); |
| 2450 | return -EBUSY; |
| 2451 | } |
| 2452 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 2453 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | if (!pd) |
| 2455 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | |
Matthew Dobson | 0eaae62a | 2006-03-26 01:37:47 -0800 | [diff] [blame] | 2457 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
| 2458 | sizeof(struct pkt_rb_node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | if (!pd->rb_pool) |
| 2460 | goto out_mem; |
| 2461 | |
| 2462 | disk = alloc_disk(1); |
| 2463 | if (!disk) |
| 2464 | goto out_mem; |
| 2465 | pd->disk = disk; |
| 2466 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2467 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
| 2468 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); |
| 2469 | spin_lock_init(&pd->cdrw.active_list_lock); |
| 2470 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | spin_lock_init(&pd->lock); |
| 2472 | spin_lock_init(&pd->iosched.lock); |
| 2473 | sprintf(pd->name, "pktcdvd%d", idx); |
| 2474 | init_waitqueue_head(&pd->wqueue); |
| 2475 | pd->bio_queue = RB_ROOT; |
| 2476 | |
| 2477 | disk->major = pkt_major; |
| 2478 | disk->first_minor = idx; |
| 2479 | disk->fops = &pktcdvd_ops; |
| 2480 | disk->flags = GENHD_FL_REMOVABLE; |
| 2481 | sprintf(disk->disk_name, "pktcdvd%d", idx); |
| 2482 | disk->private_data = pd; |
| 2483 | disk->queue = blk_alloc_queue(GFP_KERNEL); |
| 2484 | if (!disk->queue) |
| 2485 | goto out_mem2; |
| 2486 | |
| 2487 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); |
| 2488 | ret = pkt_new_dev(pd, dev); |
| 2489 | if (ret) |
| 2490 | goto out_new_dev; |
| 2491 | |
| 2492 | add_disk(disk); |
| 2493 | pkt_devs[idx] = pd; |
| 2494 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); |
| 2495 | return 0; |
| 2496 | |
| 2497 | out_new_dev: |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 2498 | blk_cleanup_queue(disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | out_mem2: |
| 2500 | put_disk(disk); |
| 2501 | out_mem: |
| 2502 | if (pd->rb_pool) |
| 2503 | mempool_destroy(pd->rb_pool); |
| 2504 | kfree(pd); |
| 2505 | return ret; |
| 2506 | } |
| 2507 | |
| 2508 | /* |
| 2509 | * Tear down mapping from pktcdvd device to CD-ROM device. |
| 2510 | */ |
| 2511 | static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd) |
| 2512 | { |
| 2513 | struct pktcdvd_device *pd; |
| 2514 | int idx; |
| 2515 | dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev); |
| 2516 | |
| 2517 | for (idx = 0; idx < MAX_WRITERS; idx++) { |
| 2518 | pd = pkt_devs[idx]; |
| 2519 | if (pd && (pd->pkt_dev == pkt_dev)) |
| 2520 | break; |
| 2521 | } |
| 2522 | if (idx == MAX_WRITERS) { |
| 2523 | DPRINTK("pktcdvd: dev not setup\n"); |
| 2524 | return -ENXIO; |
| 2525 | } |
| 2526 | |
| 2527 | if (pd->refcnt > 0) |
| 2528 | return -EBUSY; |
| 2529 | |
| 2530 | if (!IS_ERR(pd->cdrw.thread)) |
| 2531 | kthread_stop(pd->cdrw.thread); |
| 2532 | |
| 2533 | blkdev_put(pd->bdev); |
| 2534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | remove_proc_entry(pd->name, pkt_proc); |
| 2536 | DPRINTK("pktcdvd: writer %s unmapped\n", pd->name); |
| 2537 | |
| 2538 | del_gendisk(pd->disk); |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 2539 | blk_cleanup_queue(pd->disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | put_disk(pd->disk); |
| 2541 | |
| 2542 | pkt_devs[idx] = NULL; |
| 2543 | mempool_destroy(pd->rb_pool); |
| 2544 | kfree(pd); |
| 2545 | |
| 2546 | /* This is safe: open() is still holding a reference. */ |
| 2547 | module_put(THIS_MODULE); |
| 2548 | return 0; |
| 2549 | } |
| 2550 | |
| 2551 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) |
| 2552 | { |
| 2553 | struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); |
| 2554 | if (pd) { |
| 2555 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); |
| 2556 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); |
| 2557 | } else { |
| 2558 | ctrl_cmd->dev = 0; |
| 2559 | ctrl_cmd->pkt_dev = 0; |
| 2560 | } |
| 2561 | ctrl_cmd->num_devices = MAX_WRITERS; |
| 2562 | } |
| 2563 | |
| 2564 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
| 2565 | { |
| 2566 | void __user *argp = (void __user *)arg; |
| 2567 | struct pkt_ctrl_command ctrl_cmd; |
| 2568 | int ret = 0; |
| 2569 | |
| 2570 | if (cmd != PACKET_CTRL_CMD) |
| 2571 | return -ENOTTY; |
| 2572 | |
| 2573 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) |
| 2574 | return -EFAULT; |
| 2575 | |
| 2576 | switch (ctrl_cmd.command) { |
| 2577 | case PKT_CTRL_CMD_SETUP: |
| 2578 | if (!capable(CAP_SYS_ADMIN)) |
| 2579 | return -EPERM; |
Arjan van de Ven | 8e185d8 | 2006-07-30 03:03:30 -0700 | [diff] [blame^] | 2580 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2581 | ret = pkt_setup_dev(&ctrl_cmd); |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2582 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | break; |
| 2584 | case PKT_CTRL_CMD_TEARDOWN: |
| 2585 | if (!capable(CAP_SYS_ADMIN)) |
| 2586 | return -EPERM; |
Arjan van de Ven | 8e185d8 | 2006-07-30 03:03:30 -0700 | [diff] [blame^] | 2587 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | ret = pkt_remove_dev(&ctrl_cmd); |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2589 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | break; |
| 2591 | case PKT_CTRL_CMD_STATUS: |
Arjan van de Ven | 8e185d8 | 2006-07-30 03:03:30 -0700 | [diff] [blame^] | 2592 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | pkt_get_status(&ctrl_cmd); |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2594 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | break; |
| 2596 | default: |
| 2597 | return -ENOTTY; |
| 2598 | } |
| 2599 | |
| 2600 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) |
| 2601 | return -EFAULT; |
| 2602 | return ret; |
| 2603 | } |
| 2604 | |
| 2605 | |
| 2606 | static struct file_operations pkt_ctl_fops = { |
| 2607 | .ioctl = pkt_ctl_ioctl, |
| 2608 | .owner = THIS_MODULE, |
| 2609 | }; |
| 2610 | |
| 2611 | static struct miscdevice pkt_misc = { |
| 2612 | .minor = MISC_DYNAMIC_MINOR, |
| 2613 | .name = "pktcdvd", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | .fops = &pkt_ctl_fops |
| 2615 | }; |
| 2616 | |
| 2617 | static int __init pkt_init(void) |
| 2618 | { |
| 2619 | int ret; |
| 2620 | |
Matthew Dobson | 0eaae62a | 2006-03-26 01:37:47 -0800 | [diff] [blame] | 2621 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
| 2622 | sizeof(struct packet_stacked_data)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | if (!psd_pool) |
| 2624 | return -ENOMEM; |
| 2625 | |
| 2626 | ret = register_blkdev(pkt_major, "pktcdvd"); |
| 2627 | if (ret < 0) { |
| 2628 | printk("pktcdvd: Unable to register block device\n"); |
| 2629 | goto out2; |
| 2630 | } |
| 2631 | if (!pkt_major) |
| 2632 | pkt_major = ret; |
| 2633 | |
| 2634 | ret = misc_register(&pkt_misc); |
| 2635 | if (ret) { |
| 2636 | printk("pktcdvd: Unable to register misc device\n"); |
| 2637 | goto out; |
| 2638 | } |
| 2639 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2640 | mutex_init(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2641 | |
| 2642 | pkt_proc = proc_mkdir("pktcdvd", proc_root_driver); |
| 2643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | return 0; |
| 2645 | |
| 2646 | out: |
| 2647 | unregister_blkdev(pkt_major, "pktcdvd"); |
| 2648 | out2: |
| 2649 | mempool_destroy(psd_pool); |
| 2650 | return ret; |
| 2651 | } |
| 2652 | |
| 2653 | static void __exit pkt_exit(void) |
| 2654 | { |
| 2655 | remove_proc_entry("pktcdvd", proc_root_driver); |
| 2656 | misc_deregister(&pkt_misc); |
| 2657 | unregister_blkdev(pkt_major, "pktcdvd"); |
| 2658 | mempool_destroy(psd_pool); |
| 2659 | } |
| 2660 | |
| 2661 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); |
| 2662 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); |
| 2663 | MODULE_LICENSE("GPL"); |
| 2664 | |
| 2665 | module_init(pkt_init); |
| 2666 | module_exit(pkt_exit); |