Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * sr.c Copyright (C) 1992 David Giller |
| 3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale |
| 4 | * |
| 5 | * adapted from: |
| 6 | * sd.c Copyright (C) 1992 Drew Eckhardt |
| 7 | * Linux scsi disk driver by |
| 8 | * Drew Eckhardt <drew@colorado.edu> |
| 9 | * |
| 10 | * Modified by Eric Youngdale ericy@andante.org to |
| 11 | * add scatter-gather, multiple outstanding request, and other |
| 12 | * enhancements. |
| 13 | * |
| 14 | * Modified by Eric Youngdale eric@andante.org to support loadable |
| 15 | * low-level scsi drivers. |
| 16 | * |
| 17 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to |
| 18 | * provide auto-eject. |
| 19 | * |
| 20 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the |
| 21 | * generic cdrom interface |
| 22 | * |
| 23 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() |
| 24 | * interface, capabilities probe additions, ioctl cleanups, etc. |
| 25 | * |
| 26 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs |
| 27 | * |
| 28 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM |
| 29 | * transparently and lose the GHOST hack |
| 30 | * |
| 31 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 32 | * check resource allocation in sr_init and some cleanups |
| 33 | */ |
| 34 | |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/mm.h> |
| 39 | #include <linux/bio.h> |
| 40 | #include <linux/string.h> |
| 41 | #include <linux/errno.h> |
| 42 | #include <linux/cdrom.h> |
| 43 | #include <linux/interrupt.h> |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/blkdev.h> |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 46 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 47 | #include <linux/slab.h> |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 48 | #include <linux/pm_runtime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <asm/uaccess.h> |
| 50 | |
| 51 | #include <scsi/scsi.h> |
| 52 | #include <scsi/scsi_dbg.h> |
| 53 | #include <scsi/scsi_device.h> |
| 54 | #include <scsi/scsi_driver.h> |
James Bottomley | 820732b | 2005-06-12 22:21:29 -0500 | [diff] [blame] | 55 | #include <scsi/scsi_cmnd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <scsi/scsi_eh.h> |
| 57 | #include <scsi/scsi_host.h> |
| 58 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #include "scsi_logging.h" |
| 61 | #include "sr.h" |
| 62 | |
| 63 | |
Rene Herman | f018fa5 | 2006-03-08 00:14:20 -0800 | [diff] [blame] | 64 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
| 65 | MODULE_LICENSE("GPL"); |
| 66 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); |
Michael Tokarev | d7b8bcb | 2006-10-27 16:02:37 +0400 | [diff] [blame] | 67 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
| 68 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); |
Rene Herman | f018fa5 | 2006-03-08 00:14:20 -0800 | [diff] [blame] | 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #define SR_DISKS 256 |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define SR_CAPABILITIES \ |
| 73 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ |
| 74 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ |
Christoph Hellwig | 6a2900b | 2006-03-23 03:00:15 -0800 | [diff] [blame] | 75 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
| 77 | CDC_MRW|CDC_MRW_W|CDC_RAM) |
| 78 | |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 79 | static DEFINE_MUTEX(sr_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | static int sr_probe(struct device *); |
| 81 | static int sr_remove(struct device *); |
Christoph Hellwig | a1b73fc | 2014-05-01 16:51:04 +0200 | [diff] [blame] | 82 | static int sr_init_command(struct scsi_cmnd *SCpnt); |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 83 | static int sr_done(struct scsi_cmnd *); |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 84 | static int sr_runtime_suspend(struct device *dev); |
| 85 | |
| 86 | static struct dev_pm_ops sr_pm_ops = { |
| 87 | .runtime_suspend = sr_runtime_suspend, |
| 88 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | static struct scsi_driver sr_template = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | .gendrv = { |
| 92 | .name = "sr", |
Christoph Hellwig | 3af6b35 | 2014-11-12 18:34:51 +0100 | [diff] [blame] | 93 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | .probe = sr_probe, |
| 95 | .remove = sr_remove, |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 96 | .pm = &sr_pm_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | }, |
Christoph Hellwig | a1b73fc | 2014-05-01 16:51:04 +0200 | [diff] [blame] | 98 | .init_command = sr_init_command, |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 99 | .done = sr_done, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
| 102 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; |
| 103 | static DEFINE_SPINLOCK(sr_index_lock); |
| 104 | |
| 105 | /* This semaphore is used to mediate the 0->1 reference get in the |
| 106 | * face of object destruction (i.e. we can't allow a get on an |
| 107 | * object after last put) */ |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 108 | static DEFINE_MUTEX(sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | static int sr_open(struct cdrom_device_info *, int); |
| 111 | static void sr_release(struct cdrom_device_info *); |
| 112 | |
| 113 | static void get_sectorsize(struct scsi_cd *); |
| 114 | static void get_capabilities(struct scsi_cd *); |
| 115 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 116 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
| 117 | unsigned int clearing, int slot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
| 119 | |
| 120 | static struct cdrom_device_ops sr_dops = { |
| 121 | .open = sr_open, |
| 122 | .release = sr_release, |
| 123 | .drive_status = sr_drive_status, |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 124 | .check_events = sr_check_events, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | .tray_move = sr_tray_move, |
| 126 | .lock_door = sr_lock_door, |
| 127 | .select_speed = sr_select_speed, |
| 128 | .get_last_session = sr_get_last_session, |
| 129 | .get_mcn = sr_get_mcn, |
| 130 | .reset = sr_reset, |
| 131 | .audio_ioctl = sr_audio_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | .capability = SR_CAPABILITIES, |
| 133 | .generic_packet = sr_packet, |
| 134 | }; |
| 135 | |
| 136 | static void sr_kref_release(struct kref *kref); |
| 137 | |
| 138 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) |
| 139 | { |
| 140 | return container_of(disk->private_data, struct scsi_cd, driver); |
| 141 | } |
| 142 | |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 143 | static int sr_runtime_suspend(struct device *dev) |
| 144 | { |
| 145 | struct scsi_cd *cd = dev_get_drvdata(dev); |
| 146 | |
Alan Stern | 13b4389 | 2016-01-20 11:26:01 -0500 | [diff] [blame] | 147 | if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
| 148 | return 0; |
| 149 | |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 150 | if (cd->media_present) |
| 151 | return -EBUSY; |
| 152 | else |
| 153 | return 0; |
| 154 | } |
| 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | /* |
| 157 | * The get and put routines for the struct scsi_cd. Note this entity |
| 158 | * has a scsi_device pointer and owns a reference to this. |
| 159 | */ |
| 160 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) |
| 161 | { |
| 162 | struct scsi_cd *cd = NULL; |
| 163 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 164 | mutex_lock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (disk->private_data == NULL) |
| 166 | goto out; |
| 167 | cd = scsi_cd(disk); |
| 168 | kref_get(&cd->kref); |
Aaron Lu | 6627b38 | 2013-10-28 15:27:49 +0800 | [diff] [blame] | 169 | if (scsi_device_get(cd->device)) { |
| 170 | kref_put(&cd->kref, sr_kref_release); |
| 171 | cd = NULL; |
| 172 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | out: |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 174 | mutex_unlock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return cd; |
| 176 | } |
| 177 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 178 | static void scsi_cd_put(struct scsi_cd *cd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
| 180 | struct scsi_device *sdev = cd->device; |
| 181 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 182 | mutex_lock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | kref_put(&cd->kref, sr_kref_release); |
| 184 | scsi_device_put(sdev); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 185 | mutex_unlock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 188 | static unsigned int sr_get_events(struct scsi_device *sdev) |
| 189 | { |
| 190 | u8 buf[8]; |
| 191 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, |
| 192 | 1, /* polled */ |
| 193 | 0, 0, /* reserved */ |
| 194 | 1 << 4, /* notification class: media */ |
| 195 | 0, 0, /* reserved */ |
| 196 | 0, sizeof(buf), /* allocation length */ |
| 197 | 0, /* control */ |
| 198 | }; |
| 199 | struct event_header *eh = (void *)buf; |
| 200 | struct media_event_desc *med = (void *)(buf + 4); |
| 201 | struct scsi_sense_hdr sshdr; |
| 202 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 204 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), |
| 205 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); |
| 206 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) |
| 207 | return DISK_EVENT_MEDIA_CHANGE; |
| 208 | |
| 209 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) |
| 210 | return 0; |
| 211 | |
| 212 | if (eh->nea || eh->notification_class != 0x4) |
| 213 | return 0; |
| 214 | |
| 215 | if (med->media_event_code == 1) |
| 216 | return DISK_EVENT_EJECT_REQUEST; |
| 217 | else if (med->media_event_code == 2) |
| 218 | return DISK_EVENT_MEDIA_CHANGE; |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * This function checks to see if the media has been changed or eject |
| 224 | * button has been pressed. It is possible that we have already |
| 225 | * sensed a change, or the drive may have sensed one and not yet |
| 226 | * reported it. The past events are accumulated in sdev->changed and |
| 227 | * returned together with the current state. |
| 228 | */ |
| 229 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
| 230 | unsigned int clearing, int slot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
| 232 | struct scsi_cd *cd = cdi->handle; |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 233 | bool last_present; |
| 234 | struct scsi_sense_hdr sshdr; |
| 235 | unsigned int events; |
| 236 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 238 | /* no changer support */ |
| 239 | if (CDSL_CURRENT != slot) |
| 240 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 242 | events = sr_get_events(cd->device); |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 243 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
| 244 | |
| 245 | /* |
| 246 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree |
| 247 | * for several times in a row. We rely on TUR only for this likely |
| 248 | * broken device, to prevent generating incorrect media changed |
| 249 | * events for every open(). |
| 250 | */ |
| 251 | if (cd->ignore_get_event) { |
| 252 | events &= ~DISK_EVENT_MEDIA_CHANGE; |
| 253 | goto do_tur; |
| 254 | } |
| 255 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 256 | /* |
| 257 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE |
| 258 | * is being cleared. Note that there are devices which hang |
| 259 | * if asked to execute TUR repeatedly. |
| 260 | */ |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 261 | if (cd->device->changed) { |
| 262 | events |= DISK_EVENT_MEDIA_CHANGE; |
| 263 | cd->device->changed = 0; |
| 264 | cd->tur_changed = true; |
| 265 | } |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 266 | |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 267 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
| 268 | return events; |
| 269 | do_tur: |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 270 | /* let's see whether the media is there with TUR */ |
| 271 | last_present = cd->media_present; |
| 272 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
| 273 | |
Tejun Heo | 638428e | 2010-12-09 11:18:42 +0100 | [diff] [blame] | 274 | /* |
| 275 | * Media is considered to be present if TUR succeeds or fails with |
| 276 | * sense data indicating something other than media-not-present |
| 277 | * (ASC 0x3a). |
| 278 | */ |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 279 | cd->media_present = scsi_status_is_good(ret) || |
| 280 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 282 | if (last_present != cd->media_present) |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 283 | cd->device->changed = 1; |
| 284 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 285 | if (cd->device->changed) { |
| 286 | events |= DISK_EVENT_MEDIA_CHANGE; |
| 287 | cd->device->changed = 0; |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 288 | cd->tur_changed = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
Kay Sievers | 285e967 | 2007-08-14 14:10:39 +0200 | [diff] [blame] | 290 | |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 291 | if (cd->ignore_get_event) |
| 292 | return events; |
| 293 | |
| 294 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ |
| 295 | if (!cd->tur_changed) { |
| 296 | if (cd->get_event_changed) { |
| 297 | if (cd->tur_mismatch++ > 8) { |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 298 | sr_printk(KERN_WARNING, cd, |
| 299 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); |
Kay Sievers | 79b9677 | 2011-06-30 15:03:48 +0200 | [diff] [blame] | 300 | cd->ignore_get_event = true; |
| 301 | } |
| 302 | } else { |
| 303 | cd->tur_mismatch = 0; |
| 304 | } |
| 305 | } |
| 306 | cd->tur_changed = false; |
| 307 | cd->get_event_changed = false; |
| 308 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 309 | return events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 313 | * sr_done is the interrupt routine for the device driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | * |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 315 | * It will be notified on the end of a SCSI read / write, and will take one |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | * of several actions based on success or failure. |
| 317 | */ |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 318 | static int sr_done(struct scsi_cmnd *SCpnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
| 320 | int result = SCpnt->result; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 321 | int this_count = scsi_bufflen(SCpnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | int good_bytes = (result == 0 ? this_count : 0); |
| 323 | int block_sectors = 0; |
| 324 | long error_sector; |
| 325 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); |
| 326 | |
| 327 | #ifdef DEBUG |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 328 | scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | #endif |
| 330 | |
| 331 | /* |
| 332 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial |
| 333 | * success. Since this is a relatively rare error condition, no |
| 334 | * care is taken to avoid unnecessary additional work such as |
| 335 | * memcpy's that could be avoided. |
| 336 | */ |
| 337 | if (driver_byte(result) != 0 && /* An error occurred */ |
| 338 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ |
| 339 | switch (SCpnt->sense_buffer[2]) { |
| 340 | case MEDIUM_ERROR: |
| 341 | case VOLUME_OVERFLOW: |
| 342 | case ILLEGAL_REQUEST: |
| 343 | if (!(SCpnt->sense_buffer[0] & 0x90)) |
| 344 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
| 346 | (SCpnt->sense_buffer[4] << 16) | |
| 347 | (SCpnt->sense_buffer[5] << 8) | |
| 348 | SCpnt->sense_buffer[6]; |
| 349 | if (SCpnt->request->bio != NULL) |
| 350 | block_sectors = |
| 351 | bio_sectors(SCpnt->request->bio); |
| 352 | if (block_sectors < 4) |
| 353 | block_sectors = 4; |
| 354 | if (cd->device->sector_size == 2048) |
| 355 | error_sector <<= 2; |
| 356 | error_sector &= ~(block_sectors - 1); |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 357 | good_bytes = (error_sector - |
| 358 | blk_rq_pos(SCpnt->request)) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (good_bytes < 0 || good_bytes >= this_count) |
| 360 | good_bytes = 0; |
| 361 | /* |
| 362 | * The SCSI specification allows for the value |
| 363 | * returned by READ CAPACITY to be up to 75 2K |
| 364 | * sectors past the last readable block. |
| 365 | * Therefore, if we hit a medium error within the |
| 366 | * last 75 2K sectors, we decrease the saved size |
| 367 | * value. |
| 368 | */ |
| 369 | if (error_sector < get_capacity(cd->disk) && |
| 370 | cd->capacity - error_sector < 4 * 75) |
| 371 | set_capacity(cd->disk, error_sector); |
| 372 | break; |
| 373 | |
| 374 | case RECOVERED_ERROR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | good_bytes = this_count; |
| 376 | break; |
| 377 | |
| 378 | default: |
| 379 | break; |
| 380 | } |
| 381 | } |
| 382 | |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 383 | return good_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | } |
| 385 | |
Christoph Hellwig | a1b73fc | 2014-05-01 16:51:04 +0200 | [diff] [blame] | 386 | static int sr_init_command(struct scsi_cmnd *SCpnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 388 | int block = 0, this_count, s_size; |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 389 | struct scsi_cd *cd; |
Christoph Hellwig | a1b73fc | 2014-05-01 16:51:04 +0200 | [diff] [blame] | 390 | struct request *rq = SCpnt->request; |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 391 | int ret; |
| 392 | |
Christoph Hellwig | 3c356bd | 2014-09-05 18:20:23 -0700 | [diff] [blame] | 393 | ret = scsi_init_io(SCpnt); |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 394 | if (ret != BLKPREP_OK) |
| 395 | goto out; |
| 396 | SCpnt = rq->special; |
| 397 | cd = scsi_cd(rq->rq_disk); |
| 398 | |
| 399 | /* from here on until we're complete, any goto out |
| 400 | * is used for a killable error condition */ |
| 401 | ret = BLKPREP_KILL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 403 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
| 404 | "Doing sr request, block = %d\n", block)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
| 406 | if (!cd->device || !scsi_device_online(cd->device)) { |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 407 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| 408 | "Finishing %u sectors\n", blk_rq_sectors(rq))); |
| 409 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| 410 | "Retry with 0x%p\n", SCpnt)); |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 411 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | if (cd->device->changed) { |
| 415 | /* |
| 416 | * quietly refuse to do anything to a changed disc until the |
| 417 | * changed bit has been reset |
| 418 | */ |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 419 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | * we do lazy blocksize switching (when reading XA sectors, |
| 424 | * see CDROMREADMODE2 ioctl) |
| 425 | */ |
| 426 | s_size = cd->device->sector_size; |
| 427 | if (s_size > 2048) { |
| 428 | if (!in_interrupt()) |
| 429 | sr_set_blocklength(cd, 2048); |
| 430 | else |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 431 | scmd_printk(KERN_INFO, SCpnt, |
| 432 | "can't switch blocksize: in interrupt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { |
Jeff Garzik | 3bf743e | 2005-10-24 18:04:06 -0400 | [diff] [blame] | 436 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 437 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 440 | if (rq_data_dir(rq) == WRITE) { |
Christoph Hellwig | fd2eb90 | 2014-07-18 16:59:19 +0200 | [diff] [blame] | 441 | if (!cd->writeable) |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 442 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | SCpnt->cmnd[0] = WRITE_10; |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 444 | cd->cdi.media_written = 1; |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 445 | } else if (rq_data_dir(rq) == READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | SCpnt->cmnd[0] = READ_10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } else { |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 448 | blk_dump_rq_flags(rq, "Unknown sr command"); |
| 449 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | { |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 453 | struct scatterlist *sg; |
| 454 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 456 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
| 457 | size += sg->length; |
| 458 | |
| 459 | if (size != scsi_bufflen(SCpnt)) { |
Jeff Garzik | 3bf743e | 2005-10-24 18:04:06 -0400 | [diff] [blame] | 460 | scmd_printk(KERN_ERR, SCpnt, |
| 461 | "mismatch count %d, bytes %d\n", |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 462 | size, scsi_bufflen(SCpnt)); |
| 463 | if (scsi_bufflen(SCpnt) > size) |
| 464 | SCpnt->sdb.length = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * request doesn't start on hw block boundary, add scatter pads |
| 470 | */ |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 471 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 472 | (scsi_bufflen(SCpnt) % s_size)) { |
Jeff Garzik | 3bf743e | 2005-10-24 18:04:06 -0400 | [diff] [blame] | 473 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 474 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 477 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 480 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| 481 | "%s %d/%u 512 byte blocks.\n", |
| 482 | (rq_data_dir(rq) == WRITE) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | "writing" : "reading", |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 484 | this_count, blk_rq_sectors(rq))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | SCpnt->cmnd[1] = 0; |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 487 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | if (this_count > 0xffff) { |
| 490 | this_count = 0xffff; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 491 | SCpnt->sdb.length = this_count * s_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
| 495 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; |
| 496 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; |
| 497 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; |
| 498 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
| 499 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; |
| 500 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; |
| 501 | |
| 502 | /* |
| 503 | * We shouldn't disconnect in the middle of a sector, so with a dumb |
| 504 | * host adapter, it's safe to assume that we can at least transfer |
| 505 | * this many bytes between each connect / disconnect. |
| 506 | */ |
| 507 | SCpnt->transfersize = cd->device->sector_size; |
| 508 | SCpnt->underflow = this_count << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | SCpnt->allowed = MAX_RETRIES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | * This indicates that the command is ready from our end to be |
| 513 | * queued. |
| 514 | */ |
James Bottomley | 7f9a6bc | 2007-08-04 10:06:25 -0500 | [diff] [blame] | 515 | ret = BLKPREP_OK; |
| 516 | out: |
Christoph Hellwig | a1b73fc | 2014-05-01 16:51:04 +0200 | [diff] [blame] | 517 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 520 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | { |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 522 | struct scsi_cd *cd; |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 523 | int ret = -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 525 | mutex_lock(&sr_mutex); |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 526 | cd = scsi_cd_get(bdev->bd_disk); |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 527 | if (cd) { |
| 528 | ret = cdrom_open(&cd->cdi, bdev, mode); |
| 529 | if (ret) |
| 530 | scsi_cd_put(cd); |
| 531 | } |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 532 | mutex_unlock(&sr_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | return ret; |
| 534 | } |
| 535 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 536 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | { |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 538 | struct scsi_cd *cd = scsi_cd(disk); |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 539 | mutex_lock(&sr_mutex); |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 540 | cdrom_release(&cd->cdi, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | scsi_cd_put(cd); |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 542 | mutex_unlock(&sr_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } |
| 544 | |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 545 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | unsigned long arg) |
| 547 | { |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 548 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | struct scsi_device *sdev = cd->device; |
Christoph Hellwig | 6a2900b | 2006-03-23 03:00:15 -0800 | [diff] [blame] | 550 | void __user *argp = (void __user *)arg; |
| 551 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 553 | mutex_lock(&sr_mutex); |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 554 | |
Christoph Hellwig | 906d15f | 2014-10-11 16:25:31 +0200 | [diff] [blame] | 555 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
| 556 | (mode & FMODE_NDELAY) != 0); |
| 557 | if (ret) |
| 558 | goto out; |
| 559 | |
Christoph Hellwig | 6a2900b | 2006-03-23 03:00:15 -0800 | [diff] [blame] | 560 | /* |
| 561 | * Send SCSI addressing ioctls directly to mid level, send other |
| 562 | * ioctls to cdrom/block level. |
| 563 | */ |
| 564 | switch (cmd) { |
| 565 | case SCSI_IOCTL_GET_IDLUN: |
| 566 | case SCSI_IOCTL_GET_BUS_NUMBER: |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 567 | ret = scsi_ioctl(sdev, cmd, argp); |
| 568 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | } |
Christoph Hellwig | 6a2900b | 2006-03-23 03:00:15 -0800 | [diff] [blame] | 570 | |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 571 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
Tejun Heo | 6397256 | 2007-01-02 17:41:04 +0900 | [diff] [blame] | 572 | if (ret != -ENOSYS) |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 573 | goto out; |
Christoph Hellwig | 6a2900b | 2006-03-23 03:00:15 -0800 | [diff] [blame] | 574 | |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 575 | ret = scsi_ioctl(sdev, cmd, argp); |
| 576 | |
| 577 | out: |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 578 | mutex_unlock(&sr_mutex); |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 579 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 582 | static unsigned int sr_block_check_events(struct gendisk *disk, |
| 583 | unsigned int clearing) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | { |
| 585 | struct scsi_cd *cd = scsi_cd(disk); |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 586 | |
Aaron Lu | 6627b38 | 2013-10-28 15:27:49 +0800 | [diff] [blame] | 587 | if (atomic_read(&cd->device->disk_events_disable_depth)) |
| 588 | return 0; |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 589 | |
Aaron Lu | 6627b38 | 2013-10-28 15:27:49 +0800 | [diff] [blame] | 590 | return cdrom_check_events(&cd->cdi, clearing); |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | static int sr_block_revalidate_disk(struct gendisk *disk) |
| 594 | { |
| 595 | struct scsi_cd *cd = scsi_cd(disk); |
| 596 | struct scsi_sense_hdr sshdr; |
| 597 | |
| 598 | /* if the unit is not ready, nothing more to do */ |
| 599 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 600 | goto out; |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 601 | |
| 602 | sr_cd_check(&cd->cdi); |
| 603 | get_sectorsize(cd); |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 604 | out: |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 605 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 608 | static const struct block_device_operations sr_bdops = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
| 610 | .owner = THIS_MODULE, |
Al Viro | 40cc51b | 2008-03-02 10:41:28 -0500 | [diff] [blame] | 611 | .open = sr_block_open, |
| 612 | .release = sr_block_release, |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 613 | .ioctl = sr_block_ioctl, |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 614 | .check_events = sr_block_check_events, |
| 615 | .revalidate_disk = sr_block_revalidate_disk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | /* |
| 617 | * No compat_ioctl for now because sr_block_ioctl never |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 618 | * seems to pass arbitrary ioctls down to host drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | */ |
| 620 | }; |
| 621 | |
| 622 | static int sr_open(struct cdrom_device_info *cdi, int purpose) |
| 623 | { |
| 624 | struct scsi_cd *cd = cdi->handle; |
| 625 | struct scsi_device *sdev = cd->device; |
| 626 | int retval; |
| 627 | |
| 628 | /* |
| 629 | * If the device is in error recovery, wait until it is done. |
| 630 | * If the device is offline, then disallow any access to it. |
| 631 | */ |
| 632 | retval = -ENXIO; |
| 633 | if (!scsi_block_when_processing_errors(sdev)) |
| 634 | goto error_out; |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | return 0; |
| 637 | |
| 638 | error_out: |
| 639 | return retval; |
| 640 | } |
| 641 | |
| 642 | static void sr_release(struct cdrom_device_info *cdi) |
| 643 | { |
| 644 | struct scsi_cd *cd = cdi->handle; |
| 645 | |
| 646 | if (cd->device->sector_size > 2048) |
| 647 | sr_set_blocklength(cd, 2048); |
| 648 | |
| 649 | } |
| 650 | |
| 651 | static int sr_probe(struct device *dev) |
| 652 | { |
| 653 | struct scsi_device *sdev = to_scsi_device(dev); |
| 654 | struct gendisk *disk; |
| 655 | struct scsi_cd *cd; |
| 656 | int minor, error; |
| 657 | |
Subhash Jadavani | 6fe8c1d | 2014-09-10 14:54:09 +0300 | [diff] [blame] | 658 | scsi_autopm_get_device(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | error = -ENODEV; |
| 660 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) |
| 661 | goto fail; |
| 662 | |
| 663 | error = -ENOMEM; |
Jes Sorensen | 24669f75 | 2006-01-16 10:31:18 -0500 | [diff] [blame] | 664 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | if (!cd) |
| 666 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | kref_init(&cd->kref); |
| 669 | |
| 670 | disk = alloc_disk(1); |
| 671 | if (!disk) |
| 672 | goto fail_free; |
| 673 | |
| 674 | spin_lock(&sr_index_lock); |
| 675 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); |
| 676 | if (minor == SR_DISKS) { |
| 677 | spin_unlock(&sr_index_lock); |
| 678 | error = -EBUSY; |
| 679 | goto fail_put; |
| 680 | } |
| 681 | __set_bit(minor, sr_index_bits); |
| 682 | spin_unlock(&sr_index_lock); |
| 683 | |
| 684 | disk->major = SCSI_CDROM_MAJOR; |
| 685 | disk->first_minor = minor; |
| 686 | sprintf(disk->disk_name, "sr%d", minor); |
| 687 | disk->fops = &sr_bdops; |
Tejun Heo | d4dc210 | 2011-04-21 20:54:46 +0200 | [diff] [blame] | 688 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 689 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 691 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | cd->device = sdev; |
| 694 | cd->disk = disk; |
| 695 | cd->driver = &sr_template; |
| 696 | cd->disk = disk; |
| 697 | cd->capacity = 0x1fffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | cd->device->changed = 1; /* force recheck CD type */ |
Tejun Heo | 93aae17 | 2010-12-16 17:52:17 +0100 | [diff] [blame] | 699 | cd->media_present = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | cd->use = 1; |
| 701 | cd->readcd_known = 0; |
| 702 | cd->readcd_cdda = 0; |
| 703 | |
| 704 | cd->cdi.ops = &sr_dops; |
| 705 | cd->cdi.handle = cd; |
| 706 | cd->cdi.mask = 0; |
| 707 | cd->cdi.capacity = 1; |
| 708 | sprintf(cd->cdi.name, "sr%d", minor); |
| 709 | |
| 710 | sdev->sector_size = 2048; /* A guess, just in case */ |
| 711 | |
| 712 | /* FIXME: need to handle a get_capabilities failure properly ?? */ |
| 713 | get_capabilities(cd); |
| 714 | sr_vendor_init(cd); |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | set_capacity(disk, cd->capacity); |
| 717 | disk->private_data = &cd->driver; |
| 718 | disk->queue = sdev->request_queue; |
| 719 | cd->cdi.disk = disk; |
| 720 | |
| 721 | if (register_cdrom(&cd->cdi)) |
| 722 | goto fail_put; |
| 723 | |
Aaron Lu | 6627b38 | 2013-10-28 15:27:49 +0800 | [diff] [blame] | 724 | /* |
| 725 | * Initialize block layer runtime PM stuffs before the |
| 726 | * periodic event checking request gets started in add_disk. |
| 727 | */ |
| 728 | blk_pm_runtime_init(sdev->request_queue, dev); |
| 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | dev_set_drvdata(dev, cd); |
| 731 | disk->flags |= GENHD_FL_REMOVABLE; |
Dan Williams | 0d52c756 | 2016-06-15 19:44:20 -0700 | [diff] [blame] | 732 | device_add_disk(&sdev->sdev_gendev, disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 734 | sdev_printk(KERN_DEBUG, sdev, |
| 735 | "Attached scsi CD-ROM %s\n", cd->cdi.name); |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 736 | scsi_autopm_put_device(cd->device); |
| 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | return 0; |
| 739 | |
| 740 | fail_put: |
| 741 | put_disk(disk); |
| 742 | fail_free: |
| 743 | kfree(cd); |
| 744 | fail: |
Subhash Jadavani | 6fe8c1d | 2014-09-10 14:54:09 +0300 | [diff] [blame] | 745 | scsi_autopm_put_device(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | return error; |
| 747 | } |
| 748 | |
| 749 | |
| 750 | static void get_sectorsize(struct scsi_cd *cd) |
| 751 | { |
| 752 | unsigned char cmd[10]; |
FUJITA Tomonori | 62858da | 2008-07-04 09:31:50 +0200 | [diff] [blame] | 753 | unsigned char buffer[8]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | int the_result, retries = 3; |
| 755 | int sector_size; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 756 | struct request_queue *queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | do { |
| 759 | cmd[0] = READ_CAPACITY; |
| 760 | memset((void *) &cmd[1], 0, 9); |
FUJITA Tomonori | 62858da | 2008-07-04 09:31:50 +0200 | [diff] [blame] | 761 | memset(buffer, 0, sizeof(buffer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | /* Do the command and wait.. */ |
James Bottomley | 820732b | 2005-06-12 22:21:29 -0500 | [diff] [blame] | 764 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
FUJITA Tomonori | 62858da | 2008-07-04 09:31:50 +0200 | [diff] [blame] | 765 | buffer, sizeof(buffer), NULL, |
FUJITA Tomonori | f4f4e47 | 2008-12-04 14:24:39 +0900 | [diff] [blame] | 766 | SR_TIMEOUT, MAX_RETRIES, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | retries--; |
| 769 | |
| 770 | } while (the_result && retries); |
| 771 | |
| 772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | if (the_result) { |
| 774 | cd->capacity = 0x1fffff; |
| 775 | sector_size = 2048; /* A guess, just in case */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } else { |
Tejun Heo | 5915136 | 2009-09-04 11:38:02 +0900 | [diff] [blame] | 777 | long last_written; |
| 778 | |
| 779 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | |
| 780 | (buffer[2] << 8) | buffer[3]); |
| 781 | /* |
| 782 | * READ_CAPACITY doesn't return the correct size on |
| 783 | * certain UDF media. If last_written is larger, use |
| 784 | * it instead. |
| 785 | * |
| 786 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 |
| 787 | */ |
| 788 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) |
| 789 | cd->capacity = max_t(long, cd->capacity, last_written); |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | sector_size = (buffer[4] << 24) | |
| 792 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; |
| 793 | switch (sector_size) { |
| 794 | /* |
| 795 | * HP 4020i CD-Recorder reports 2340 byte sectors |
| 796 | * Philips CD-Writers report 2352 byte sectors |
| 797 | * |
| 798 | * Use 2k sectors for them.. |
| 799 | */ |
| 800 | case 0: |
| 801 | case 2340: |
| 802 | case 2352: |
| 803 | sector_size = 2048; |
| 804 | /* fall through */ |
| 805 | case 2048: |
| 806 | cd->capacity *= 4; |
| 807 | /* fall through */ |
| 808 | case 512: |
| 809 | break; |
| 810 | default: |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 811 | sr_printk(KERN_INFO, cd, |
| 812 | "unsupported sector size %d.", sector_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | cd->capacity = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | cd->device->sector_size = sector_size; |
| 817 | |
| 818 | /* |
| 819 | * Add this so that we have the ability to correctly gauge |
| 820 | * what the device is capable of. |
| 821 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | set_capacity(cd->disk, cd->capacity); |
| 823 | } |
| 824 | |
| 825 | queue = cd->device->request_queue; |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 826 | blk_queue_logical_block_size(queue, sector_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
FUJITA Tomonori | 62858da | 2008-07-04 09:31:50 +0200 | [diff] [blame] | 828 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | static void get_capabilities(struct scsi_cd *cd) |
| 832 | { |
| 833 | unsigned char *buffer; |
| 834 | struct scsi_mode_data data; |
James Bottomley | 820732b | 2005-06-12 22:21:29 -0500 | [diff] [blame] | 835 | struct scsi_sense_hdr sshdr; |
James Bottomley | 38582a6 | 2008-02-06 13:01:58 -0600 | [diff] [blame] | 836 | int rc, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Arjan van de Ven | 0ad7820 | 2005-11-28 16:22:25 +0100 | [diff] [blame] | 838 | static const char *loadmech[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | { |
| 840 | "caddy", |
| 841 | "tray", |
| 842 | "pop-up", |
| 843 | "", |
| 844 | "changer", |
| 845 | "cartridge changer", |
| 846 | "", |
| 847 | "" |
| 848 | }; |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
| 851 | /* allocate transfer buffer */ |
| 852 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); |
| 853 | if (!buffer) { |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 854 | sr_printk(KERN_ERR, cd, "out of memory.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | return; |
| 856 | } |
| 857 | |
James Bottomley | 38582a6 | 2008-02-06 13:01:58 -0600 | [diff] [blame] | 858 | /* eat unit attentions */ |
Tejun Heo | 9f8a2c2 | 2010-12-08 20:57:40 +0100 | [diff] [blame] | 859 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | /* ask for mode page 0x2a */ |
| 862 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, |
James Bottomley | 1cf7269 | 2005-08-28 11:27:01 -0500 | [diff] [blame] | 863 | SR_TIMEOUT, 3, &data, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
| 865 | if (!scsi_status_is_good(rc)) { |
| 866 | /* failed, drive doesn't have capabilities mode page */ |
| 867 | cd->cdi.speed = 1; |
| 868 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | |
Chuck Ebbert | bcc1e38 | 2006-01-11 23:58:40 -0500 | [diff] [blame] | 869 | CDC_DVD | CDC_DVD_RAM | |
| 870 | CDC_SELECT_DISC | CDC_SELECT_SPEED | |
| 871 | CDC_MRW | CDC_MRW_W | CDC_RAM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | kfree(buffer); |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 873 | sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | return; |
| 875 | } |
| 876 | |
| 877 | n = data.header_length + data.block_descriptor_length; |
| 878 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; |
| 879 | cd->readcd_known = 1; |
| 880 | cd->readcd_cdda = buffer[n + 5] & 0x01; |
| 881 | /* print some capability bits */ |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 882 | sr_printk(KERN_INFO, cd, |
| 883 | "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", |
| 884 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, |
| 885 | cd->cdi.speed, |
| 886 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ |
| 887 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", |
| 888 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ |
| 889 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ |
| 890 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ |
| 891 | loadmech[buffer[n + 6] >> 5]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | if ((buffer[n + 6] >> 5) == 0) |
| 893 | /* caddy drives can't close tray... */ |
| 894 | cd->cdi.mask |= CDC_CLOSE_TRAY; |
| 895 | if ((buffer[n + 2] & 0x8) == 0) |
| 896 | /* not a DVD drive */ |
| 897 | cd->cdi.mask |= CDC_DVD; |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 898 | if ((buffer[n + 3] & 0x20) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | /* can't write DVD-RAM media */ |
| 900 | cd->cdi.mask |= CDC_DVD_RAM; |
| 901 | if ((buffer[n + 3] & 0x10) == 0) |
| 902 | /* can't write DVD-R media */ |
| 903 | cd->cdi.mask |= CDC_DVD_R; |
| 904 | if ((buffer[n + 3] & 0x2) == 0) |
| 905 | /* can't write CD-RW media */ |
| 906 | cd->cdi.mask |= CDC_CD_RW; |
| 907 | if ((buffer[n + 3] & 0x1) == 0) |
| 908 | /* can't write CD-R media */ |
| 909 | cd->cdi.mask |= CDC_CD_R; |
| 910 | if ((buffer[n + 6] & 0x8) == 0) |
| 911 | /* can't eject */ |
| 912 | cd->cdi.mask |= CDC_OPEN_TRAY; |
| 913 | |
| 914 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || |
| 915 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) |
| 916 | cd->cdi.capacity = |
| 917 | cdrom_number_of_slots(&cd->cdi); |
| 918 | if (cd->cdi.capacity <= 1) |
| 919 | /* not a changer */ |
| 920 | cd->cdi.mask |= CDC_SELECT_DISC; |
| 921 | /*else I don't think it can close its tray |
| 922 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ |
| 923 | |
| 924 | /* |
| 925 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable |
| 926 | */ |
| 927 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != |
| 928 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { |
Christoph Hellwig | fd2eb90 | 2014-07-18 16:59:19 +0200 | [diff] [blame] | 929 | cd->writeable = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | kfree(buffer); |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * sr_packet() is the entry point for the generic commands generated |
Hannes Reinecke | 96eefad | 2014-06-25 16:39:54 +0200 | [diff] [blame] | 937 | * by the Uniform CD-ROM layer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | */ |
| 939 | static int sr_packet(struct cdrom_device_info *cdi, |
| 940 | struct packet_command *cgc) |
| 941 | { |
Hans de Goede | 8e04d80 | 2010-10-01 14:20:08 -0700 | [diff] [blame] | 942 | struct scsi_cd *cd = cdi->handle; |
| 943 | struct scsi_device *sdev = cd->device; |
| 944 | |
| 945 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) |
| 946 | return -EDRIVE_CANT_DO_THIS; |
| 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | if (cgc->timeout <= 0) |
| 949 | cgc->timeout = IOCTL_TIMEOUT; |
| 950 | |
Hans de Goede | 8e04d80 | 2010-10-01 14:20:08 -0700 | [diff] [blame] | 951 | sr_do_ioctl(cd, cgc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
| 953 | return cgc->stat; |
| 954 | } |
| 955 | |
| 956 | /** |
| 957 | * sr_kref_release - Called to free the scsi_cd structure |
| 958 | * @kref: pointer to embedded kref |
| 959 | * |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 960 | * sr_ref_mutex must be held entering this routine. Because it is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | * called on last put, you should always use the scsi_cd_get() |
| 962 | * scsi_cd_put() helpers which manipulate the semaphore directly |
| 963 | * and never do a direct kref_put(). |
| 964 | **/ |
| 965 | static void sr_kref_release(struct kref *kref) |
| 966 | { |
| 967 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); |
| 968 | struct gendisk *disk = cd->disk; |
| 969 | |
| 970 | spin_lock(&sr_index_lock); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 971 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | spin_unlock(&sr_index_lock); |
| 973 | |
| 974 | unregister_cdrom(&cd->cdi); |
| 975 | |
| 976 | disk->private_data = NULL; |
| 977 | |
| 978 | put_disk(disk); |
| 979 | |
| 980 | kfree(cd); |
| 981 | } |
| 982 | |
| 983 | static int sr_remove(struct device *dev) |
| 984 | { |
| 985 | struct scsi_cd *cd = dev_get_drvdata(dev); |
| 986 | |
Aaron Lu | 6c7f1e2 | 2013-01-23 15:09:31 +0800 | [diff] [blame] | 987 | scsi_autopm_get_device(cd->device); |
| 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | del_gendisk(cd->disk); |
Alan Stern | 13b4389 | 2016-01-20 11:26:01 -0500 | [diff] [blame] | 990 | dev_set_drvdata(dev, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 992 | mutex_lock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | kref_put(&cd->kref, sr_kref_release); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 994 | mutex_unlock(&sr_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | |
| 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | static int __init init_sr(void) |
| 1000 | { |
| 1001 | int rc; |
| 1002 | |
| 1003 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| 1004 | if (rc) |
| 1005 | return rc; |
Akinobu Mita | da3962f | 2007-06-26 00:39:33 +0900 | [diff] [blame] | 1006 | rc = scsi_register_driver(&sr_template.gendrv); |
| 1007 | if (rc) |
| 1008 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| 1009 | |
| 1010 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | static void __exit exit_sr(void) |
| 1014 | { |
| 1015 | scsi_unregister_driver(&sr_template.gendrv); |
| 1016 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| 1017 | } |
| 1018 | |
| 1019 | module_init(init_sr); |
| 1020 | module_exit(exit_sr); |
| 1021 | MODULE_LICENSE("GPL"); |