1 |
1275 |
phoenix |
/*
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2 |
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* sr.c Copyright (C) 1992 David Giller
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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*
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* adapted from:
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* sd.c Copyright (C) 1992 Drew Eckhardt
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* Linux scsi disk driver by
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* Drew Eckhardt <drew@colorado.edu>
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*
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* Modified by Eric Youngdale ericy@andante.org to
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* add scatter-gather, multiple outstanding request, and other
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* enhancements.
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*
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* Modified by Eric Youngdale eric@andante.org to support loadable
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* low-level scsi drivers.
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*
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* Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
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* provide auto-eject.
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*
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* Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
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* generic cdrom interface
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*
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* Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
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* interface, capabilities probe additions, ioctl cleanups, etc.
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25 |
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*
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* Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
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*
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* Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
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* transparently and loose the GHOST hack
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*
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* Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* check resource allocation in sr_init and some cleanups
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*
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34 |
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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40 |
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#include <linux/sched.h>
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41 |
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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44 |
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#include <linux/cdrom.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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47 |
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#include <asm/system.h>
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48 |
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#include <asm/io.h>
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49 |
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#include <asm/uaccess.h>
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51 |
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#define MAJOR_NR SCSI_CDROM_MAJOR
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#include <linux/blk.h>
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#include "scsi.h"
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#include "hosts.h"
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#include "sr.h"
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#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
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#include "constants.h"
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59 |
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MODULE_PARM(xa_test, "i"); /* see sr_ioctl.c */
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60 |
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61 |
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#define MAX_RETRIES 3
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62 |
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#define SR_TIMEOUT (30 * HZ)
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63 |
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64 |
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static int sr_init(void);
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65 |
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static void sr_finish(void);
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66 |
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static int sr_attach(Scsi_Device *);
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67 |
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static int sr_detect(Scsi_Device *);
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68 |
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static void sr_detach(Scsi_Device *);
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69 |
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70 |
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static int sr_init_command(Scsi_Cmnd *);
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71 |
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72 |
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static struct Scsi_Device_Template sr_template =
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73 |
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{
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74 |
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name:"cdrom",
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tag:"sr",
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76 |
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scsi_type:TYPE_ROM,
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77 |
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major:SCSI_CDROM_MAJOR,
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78 |
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blk:1,
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79 |
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detect:sr_detect,
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80 |
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init:sr_init,
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81 |
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finish:sr_finish,
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82 |
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attach:sr_attach,
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83 |
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detach:sr_detach,
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84 |
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init_command:sr_init_command
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85 |
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};
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86 |
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87 |
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Scsi_CD *scsi_CDs;
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88 |
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static int *sr_sizes;
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89 |
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90 |
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static int *sr_blocksizes;
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91 |
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static int *sr_hardsizes;
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92 |
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93 |
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static int sr_open(struct cdrom_device_info *, int);
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94 |
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void get_sectorsize(int);
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95 |
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void get_capabilities(int);
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96 |
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97 |
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static int sr_media_change(struct cdrom_device_info *, int);
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98 |
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static int sr_packet(struct cdrom_device_info *, struct cdrom_generic_command *);
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100 |
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static void sr_release(struct cdrom_device_info *cdi)
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101 |
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{
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102 |
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if (scsi_CDs[MINOR(cdi->dev)].device->sector_size > 2048)
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103 |
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sr_set_blocklength(MINOR(cdi->dev), 2048);
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104 |
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scsi_CDs[MINOR(cdi->dev)].device->access_count--;
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105 |
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if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
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106 |
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__MOD_DEC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
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107 |
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if (sr_template.module)
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__MOD_DEC_USE_COUNT(sr_template.module);
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109 |
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}
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111 |
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static struct cdrom_device_ops sr_dops =
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112 |
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{
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113 |
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open: sr_open,
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114 |
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release: sr_release,
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115 |
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drive_status: sr_drive_status,
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116 |
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media_changed: sr_media_change,
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117 |
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tray_move: sr_tray_move,
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118 |
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lock_door: sr_lock_door,
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119 |
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select_speed: sr_select_speed,
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120 |
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get_last_session: sr_get_last_session,
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get_mcn: sr_get_mcn,
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reset: sr_reset,
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audio_ioctl: sr_audio_ioctl,
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124 |
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dev_ioctl: sr_dev_ioctl,
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capability: CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
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126 |
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CDC_SELECT_SPEED | CDC_SELECT_DISC |
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CDC_MULTI_SESSION | CDC_MCN |
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128 |
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CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO |
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CDC_RESET | CDC_IOCTLS | CDC_DRIVE_STATUS |
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CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
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131 |
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CDC_DVD_RAM | CDC_GENERIC_PACKET,
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generic_packet: sr_packet,
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133 |
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};
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134 |
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135 |
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/*
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136 |
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* This function checks to see if the media has been changed in the
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137 |
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* CDROM drive. It is possible that we have already sensed a change,
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138 |
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* or the drive may have sensed one and not yet reported it. We must
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139 |
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* be ready for either case. This function always reports the current
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140 |
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* value of the changed bit. If flag is 0, then the changed bit is reset.
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141 |
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* This function could be done as an ioctl, but we would need to have
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142 |
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* an inode for that to work, and we do not always have one.
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143 |
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*/
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144 |
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145 |
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int sr_media_change(struct cdrom_device_info *cdi, int slot)
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146 |
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{
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147 |
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int retval;
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148 |
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149 |
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if (CDSL_CURRENT != slot) {
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150 |
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/* no changer support */
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151 |
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return -EINVAL;
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152 |
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}
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153 |
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retval = scsi_ioctl(scsi_CDs[MINOR(cdi->dev)].device,
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154 |
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SCSI_IOCTL_TEST_UNIT_READY, 0);
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155 |
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156 |
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if (retval) {
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157 |
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/* Unable to test, unit probably not ready. This usually
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158 |
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* means there is no disc in the drive. Mark as changed,
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159 |
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* and we will figure it out later once the drive is
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160 |
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* available again. */
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161 |
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162 |
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scsi_CDs[MINOR(cdi->dev)].device->changed = 1;
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return 1; /* This will force a flush, if called from
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164 |
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* check_disk_change */
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165 |
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};
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166 |
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167 |
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retval = scsi_CDs[MINOR(cdi->dev)].device->changed;
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168 |
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scsi_CDs[MINOR(cdi->dev)].device->changed = 0;
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169 |
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/* If the disk changed, the capacity will now be different,
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170 |
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* so we force a re-read of this information */
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171 |
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if (retval) {
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172 |
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/* check multisession offset etc */
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173 |
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sr_cd_check(cdi);
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174 |
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175 |
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/*
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176 |
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* If the disk changed, the capacity will now be different,
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177 |
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* so we force a re-read of this information
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178 |
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* Force 2048 for the sector size so that filesystems won't
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179 |
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* be trying to use something that is too small if the disc
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180 |
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* has changed.
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181 |
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*/
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182 |
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scsi_CDs[MINOR(cdi->dev)].needs_sector_size = 1;
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183 |
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184 |
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scsi_CDs[MINOR(cdi->dev)].device->sector_size = 2048;
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185 |
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}
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186 |
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return retval;
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187 |
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}
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188 |
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189 |
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/*
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190 |
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* rw_intr is the interrupt routine for the device driver. It will be notified on the
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191 |
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* end of a SCSI read / write, and will take on of several actions based on success or failure.
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192 |
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*/
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193 |
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194 |
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static void rw_intr(Scsi_Cmnd * SCpnt)
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195 |
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{
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196 |
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int result = SCpnt->result;
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197 |
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int this_count = SCpnt->bufflen >> 9;
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198 |
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int good_sectors = (result == 0 ? this_count : 0);
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199 |
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int block_sectors = 0;
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200 |
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int device_nr = DEVICE_NR(SCpnt->request.rq_dev);
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201 |
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long error_sector;
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202 |
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|
203 |
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#ifdef DEBUG
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204 |
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printk("sr.c done: %x %p\n", result, SCpnt->request.bh->b_data);
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205 |
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#endif
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206 |
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/*
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207 |
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Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success.
|
208 |
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Since this is a relatively rare error condition, no care is taken to
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209 |
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avoid unnecessary additional work such as memcpy's that could be avoided.
|
210 |
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*/
|
211 |
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|
212 |
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|
213 |
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if (driver_byte(result) != 0 && /* An error occurred */
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214 |
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(SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense data is valid */
|
215 |
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switch (SCpnt->sense_buffer[2]) {
|
216 |
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case MEDIUM_ERROR:
|
217 |
|
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case VOLUME_OVERFLOW:
|
218 |
|
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case ILLEGAL_REQUEST:
|
219 |
|
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if (!(SCpnt->sense_buffer[0] & 0x80))
|
220 |
|
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break;
|
221 |
|
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error_sector = (SCpnt->sense_buffer[3] << 24) |
|
222 |
|
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(SCpnt->sense_buffer[4] << 16) |
|
223 |
|
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(SCpnt->sense_buffer[5] << 8) |
|
224 |
|
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SCpnt->sense_buffer[6];
|
225 |
|
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if (SCpnt->request.bh != NULL)
|
226 |
|
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block_sectors = SCpnt->request.bh->b_size >> 9;
|
227 |
|
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if (block_sectors < 4)
|
228 |
|
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block_sectors = 4;
|
229 |
|
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if (scsi_CDs[device_nr].device->sector_size == 2048)
|
230 |
|
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error_sector <<= 2;
|
231 |
|
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error_sector &= ~(block_sectors - 1);
|
232 |
|
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good_sectors = error_sector - SCpnt->request.sector;
|
233 |
|
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if (good_sectors < 0 || good_sectors >= this_count)
|
234 |
|
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good_sectors = 0;
|
235 |
|
|
/*
|
236 |
|
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* The SCSI specification allows for the value returned
|
237 |
|
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* by READ CAPACITY to be up to 75 2K sectors past the
|
238 |
|
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* last readable block. Therefore, if we hit a medium
|
239 |
|
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* error within the last 75 2K sectors, we decrease the
|
240 |
|
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* saved size value.
|
241 |
|
|
*/
|
242 |
|
|
if ((error_sector >> 1) < sr_sizes[device_nr] &&
|
243 |
|
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scsi_CDs[device_nr].capacity - error_sector < 4 *75)
|
244 |
|
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sr_sizes[device_nr] = error_sector >> 1;
|
245 |
|
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break;
|
246 |
|
|
|
247 |
|
|
case RECOVERED_ERROR:
|
248 |
|
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/*
|
249 |
|
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* An error occured, but it recovered. Inform the
|
250 |
|
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* user, but make sure that it's not treated as a
|
251 |
|
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* hard error.
|
252 |
|
|
*/
|
253 |
|
|
print_sense("sr", SCpnt);
|
254 |
|
|
result = 0;
|
255 |
|
|
SCpnt->sense_buffer[0] = 0x0;
|
256 |
|
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good_sectors = this_count;
|
257 |
|
|
break;
|
258 |
|
|
|
259 |
|
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default:
|
260 |
|
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break;
|
261 |
|
|
}
|
262 |
|
|
}
|
263 |
|
|
|
264 |
|
|
/*
|
265 |
|
|
* This calls the generic completion function, now that we know
|
266 |
|
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* how many actual sectors finished, and how many sectors we need
|
267 |
|
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* to say have failed.
|
268 |
|
|
*/
|
269 |
|
|
scsi_io_completion(SCpnt, good_sectors, block_sectors);
|
270 |
|
|
}
|
271 |
|
|
|
272 |
|
|
|
273 |
|
|
static request_queue_t *sr_find_queue(kdev_t dev)
|
274 |
|
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{
|
275 |
|
|
/*
|
276 |
|
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* No such device
|
277 |
|
|
*/
|
278 |
|
|
if (MINOR(dev) >= sr_template.dev_max || !scsi_CDs[MINOR(dev)].device)
|
279 |
|
|
return NULL;
|
280 |
|
|
|
281 |
|
|
return &scsi_CDs[MINOR(dev)].device->request_queue;
|
282 |
|
|
}
|
283 |
|
|
|
284 |
|
|
static int sr_scatter_pad(Scsi_Cmnd *SCpnt, int s_size)
|
285 |
|
|
{
|
286 |
|
|
struct scatterlist *sg, *old_sg = NULL;
|
287 |
|
|
int i, fsize, bsize, sg_ent, sg_count;
|
288 |
|
|
char *front, *back;
|
289 |
|
|
void **bbpnt, **old_bbpnt = NULL;
|
290 |
|
|
|
291 |
|
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back = front = NULL;
|
292 |
|
|
sg_ent = SCpnt->use_sg;
|
293 |
|
|
bsize = 0; /* gcc... */
|
294 |
|
|
|
295 |
|
|
/*
|
296 |
|
|
* need front pad
|
297 |
|
|
*/
|
298 |
|
|
if ((fsize = SCpnt->request.sector % (s_size >> 9))) {
|
299 |
|
|
fsize <<= 9;
|
300 |
|
|
sg_ent++;
|
301 |
|
|
if ((front = scsi_malloc(fsize)) == NULL)
|
302 |
|
|
goto no_mem;
|
303 |
|
|
}
|
304 |
|
|
/*
|
305 |
|
|
* need a back pad too
|
306 |
|
|
*/
|
307 |
|
|
if ((bsize = s_size - ((SCpnt->request_bufflen + fsize) % s_size))) {
|
308 |
|
|
sg_ent++;
|
309 |
|
|
if ((back = scsi_malloc(bsize)) == NULL)
|
310 |
|
|
goto no_mem;
|
311 |
|
|
}
|
312 |
|
|
|
313 |
|
|
/*
|
314 |
|
|
* extend or allocate new scatter-gather table
|
315 |
|
|
*/
|
316 |
|
|
sg_count = SCpnt->use_sg;
|
317 |
|
|
if (sg_count) {
|
318 |
|
|
old_sg = (struct scatterlist *) SCpnt->request_buffer;
|
319 |
|
|
old_bbpnt = SCpnt->bounce_buffers;
|
320 |
|
|
} else {
|
321 |
|
|
sg_count = 1;
|
322 |
|
|
sg_ent++;
|
323 |
|
|
}
|
324 |
|
|
|
325 |
|
|
/* Get space for scatterlist and bounce buffer array. */
|
326 |
|
|
i = sg_ent * sizeof(struct scatterlist);
|
327 |
|
|
i += sg_ent * sizeof(void *);
|
328 |
|
|
i = (i + 511) & ~511;
|
329 |
|
|
|
330 |
|
|
if ((sg = scsi_malloc(i)) == NULL)
|
331 |
|
|
goto no_mem;
|
332 |
|
|
|
333 |
|
|
bbpnt = (void **)
|
334 |
|
|
((char *)sg + (sg_ent * sizeof(struct scatterlist)));
|
335 |
|
|
|
336 |
|
|
/*
|
337 |
|
|
* no more failing memory allocs possible, we can safely assign
|
338 |
|
|
* SCpnt values now
|
339 |
|
|
*/
|
340 |
|
|
SCpnt->sglist_len = i;
|
341 |
|
|
SCpnt->use_sg = sg_count;
|
342 |
|
|
memset(sg, 0, SCpnt->sglist_len);
|
343 |
|
|
|
344 |
|
|
i = 0;
|
345 |
|
|
if (fsize) {
|
346 |
|
|
sg[0].address = bbpnt[0] = front;
|
347 |
|
|
sg[0].length = fsize;
|
348 |
|
|
i++;
|
349 |
|
|
}
|
350 |
|
|
if (old_sg) {
|
351 |
|
|
memcpy(sg + i, old_sg, SCpnt->use_sg * sizeof(struct scatterlist));
|
352 |
|
|
if (old_bbpnt)
|
353 |
|
|
memcpy(bbpnt + i, old_bbpnt, SCpnt->use_sg * sizeof(void *));
|
354 |
|
|
scsi_free(old_sg, (((SCpnt->use_sg * sizeof(struct scatterlist)) +
|
355 |
|
|
(SCpnt->use_sg * sizeof(void *))) + 511) & ~511);
|
356 |
|
|
} else {
|
357 |
|
|
sg[i].address = SCpnt->request_buffer;
|
358 |
|
|
sg[i].length = SCpnt->request_bufflen;
|
359 |
|
|
}
|
360 |
|
|
|
361 |
|
|
SCpnt->request_bufflen += (fsize + bsize);
|
362 |
|
|
SCpnt->request_buffer = sg;
|
363 |
|
|
SCpnt->bounce_buffers = bbpnt;
|
364 |
|
|
SCpnt->use_sg += i;
|
365 |
|
|
|
366 |
|
|
if (bsize) {
|
367 |
|
|
sg[SCpnt->use_sg].address = back;
|
368 |
|
|
bbpnt[SCpnt->use_sg] = back;
|
369 |
|
|
sg[SCpnt->use_sg].length = bsize;
|
370 |
|
|
SCpnt->use_sg++;
|
371 |
|
|
}
|
372 |
|
|
|
373 |
|
|
return 0;
|
374 |
|
|
|
375 |
|
|
no_mem:
|
376 |
|
|
printk("sr: ran out of mem for scatter pad\n");
|
377 |
|
|
if (front)
|
378 |
|
|
scsi_free(front, fsize);
|
379 |
|
|
if (back)
|
380 |
|
|
scsi_free(back, bsize);
|
381 |
|
|
|
382 |
|
|
return 1;
|
383 |
|
|
}
|
384 |
|
|
|
385 |
|
|
|
386 |
|
|
static int sr_init_command(Scsi_Cmnd * SCpnt)
|
387 |
|
|
{
|
388 |
|
|
int dev, devm, block=0, this_count, s_size;
|
389 |
|
|
|
390 |
|
|
devm = MINOR(SCpnt->request.rq_dev);
|
391 |
|
|
dev = DEVICE_NR(SCpnt->request.rq_dev);
|
392 |
|
|
|
393 |
|
|
SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %d, block = %d\n", devm, block));
|
394 |
|
|
|
395 |
|
|
if (dev >= sr_template.nr_dev ||
|
396 |
|
|
!scsi_CDs[dev].device ||
|
397 |
|
|
!scsi_CDs[dev].device->online) {
|
398 |
|
|
SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", SCpnt->request.nr_sectors));
|
399 |
|
|
SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
|
400 |
|
|
return 0;
|
401 |
|
|
}
|
402 |
|
|
if (scsi_CDs[dev].device->changed) {
|
403 |
|
|
/*
|
404 |
|
|
* quietly refuse to do anything to a changed disc until the
|
405 |
|
|
* changed bit has been reset
|
406 |
|
|
*/
|
407 |
|
|
return 0;
|
408 |
|
|
}
|
409 |
|
|
|
410 |
|
|
if ((SCpnt->request.cmd == WRITE) && !scsi_CDs[dev].device->writeable)
|
411 |
|
|
return 0;
|
412 |
|
|
|
413 |
|
|
/*
|
414 |
|
|
* we do lazy blocksize switching (when reading XA sectors,
|
415 |
|
|
* see CDROMREADMODE2 ioctl)
|
416 |
|
|
*/
|
417 |
|
|
s_size = scsi_CDs[dev].device->sector_size;
|
418 |
|
|
if (s_size > 2048) {
|
419 |
|
|
if (!in_interrupt())
|
420 |
|
|
sr_set_blocklength(DEVICE_NR(CURRENT->rq_dev), 2048);
|
421 |
|
|
else
|
422 |
|
|
printk("sr: can't switch blocksize: in interrupt\n");
|
423 |
|
|
}
|
424 |
|
|
|
425 |
|
|
if (s_size != 512 && s_size != 1024 && s_size != 2048) {
|
426 |
|
|
printk("sr: bad sector size %d\n", s_size);
|
427 |
|
|
return 0;
|
428 |
|
|
}
|
429 |
|
|
|
430 |
|
|
block = SCpnt->request.sector / (s_size >> 9);
|
431 |
|
|
|
432 |
|
|
/*
|
433 |
|
|
* request doesn't start on hw block boundary, add scatter pads
|
434 |
|
|
*/
|
435 |
|
|
if ((SCpnt->request.sector % (s_size >> 9)) || (SCpnt->request_bufflen % s_size))
|
436 |
|
|
if (sr_scatter_pad(SCpnt, s_size))
|
437 |
|
|
return 0;
|
438 |
|
|
|
439 |
|
|
this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
|
440 |
|
|
|
441 |
|
|
switch (SCpnt->request.cmd) {
|
442 |
|
|
case WRITE:
|
443 |
|
|
SCpnt->cmnd[0] = WRITE_10;
|
444 |
|
|
SCpnt->sc_data_direction = SCSI_DATA_WRITE;
|
445 |
|
|
break;
|
446 |
|
|
case READ:
|
447 |
|
|
SCpnt->cmnd[0] = READ_10;
|
448 |
|
|
SCpnt->sc_data_direction = SCSI_DATA_READ;
|
449 |
|
|
break;
|
450 |
|
|
default:
|
451 |
|
|
printk("Unknown sr command %d\n", SCpnt->request.cmd);
|
452 |
|
|
return 0;
|
453 |
|
|
}
|
454 |
|
|
|
455 |
|
|
SCSI_LOG_HLQUEUE(2, printk("sr%d : %s %d/%ld 512 byte blocks.\n",
|
456 |
|
|
devm,
|
457 |
|
|
(SCpnt->request.cmd == WRITE) ? "writing" : "reading",
|
458 |
|
|
this_count, SCpnt->request.nr_sectors));
|
459 |
|
|
|
460 |
|
|
SCpnt->cmnd[1] = (SCpnt->device->scsi_level <= SCSI_2) ?
|
461 |
|
|
((SCpnt->lun << 5) & 0xe0) : 0;
|
462 |
|
|
|
463 |
|
|
if (this_count > 0xffff)
|
464 |
|
|
this_count = 0xffff;
|
465 |
|
|
|
466 |
|
|
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
|
467 |
|
|
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
|
468 |
|
|
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
|
469 |
|
|
SCpnt->cmnd[5] = (unsigned char) block & 0xff;
|
470 |
|
|
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
|
471 |
|
|
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
|
472 |
|
|
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
|
473 |
|
|
|
474 |
|
|
/*
|
475 |
|
|
* We shouldn't disconnect in the middle of a sector, so with a dumb
|
476 |
|
|
* host adapter, it's safe to assume that we can at least transfer
|
477 |
|
|
* this many bytes between each connect / disconnect.
|
478 |
|
|
*/
|
479 |
|
|
SCpnt->transfersize = scsi_CDs[dev].device->sector_size;
|
480 |
|
|
SCpnt->underflow = this_count << 9;
|
481 |
|
|
|
482 |
|
|
SCpnt->allowed = MAX_RETRIES;
|
483 |
|
|
SCpnt->timeout_per_command = SR_TIMEOUT;
|
484 |
|
|
|
485 |
|
|
/*
|
486 |
|
|
* This is the completion routine we use. This is matched in terms
|
487 |
|
|
* of capability to this function.
|
488 |
|
|
*/
|
489 |
|
|
SCpnt->done = rw_intr;
|
490 |
|
|
|
491 |
|
|
{
|
492 |
|
|
struct scatterlist *sg = SCpnt->request_buffer;
|
493 |
|
|
int i, size = 0;
|
494 |
|
|
for (i = 0; i < SCpnt->use_sg; i++)
|
495 |
|
|
size += sg[i].length;
|
496 |
|
|
|
497 |
|
|
if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
|
498 |
|
|
printk("sr: mismatch count %d, bytes %d\n", size, SCpnt->request_bufflen);
|
499 |
|
|
SCpnt->request_bufflen = size;
|
500 |
|
|
}
|
501 |
|
|
}
|
502 |
|
|
|
503 |
|
|
/*
|
504 |
|
|
* This indicates that the command is ready from our end to be
|
505 |
|
|
* queued.
|
506 |
|
|
*/
|
507 |
|
|
return 1;
|
508 |
|
|
}
|
509 |
|
|
|
510 |
|
|
struct block_device_operations sr_bdops =
|
511 |
|
|
{
|
512 |
|
|
owner: THIS_MODULE,
|
513 |
|
|
open: cdrom_open,
|
514 |
|
|
release: cdrom_release,
|
515 |
|
|
ioctl: cdrom_ioctl,
|
516 |
|
|
check_media_change: cdrom_media_changed,
|
517 |
|
|
};
|
518 |
|
|
|
519 |
|
|
static int sr_open(struct cdrom_device_info *cdi, int purpose)
|
520 |
|
|
{
|
521 |
|
|
check_disk_change(cdi->dev);
|
522 |
|
|
|
523 |
|
|
if (MINOR(cdi->dev) >= sr_template.dev_max
|
524 |
|
|
|| !scsi_CDs[MINOR(cdi->dev)].device) {
|
525 |
|
|
return -ENXIO; /* No such device */
|
526 |
|
|
}
|
527 |
|
|
/*
|
528 |
|
|
* If the device is in error recovery, wait until it is done.
|
529 |
|
|
* If the device is offline, then disallow any access to it.
|
530 |
|
|
*/
|
531 |
|
|
if (!scsi_block_when_processing_errors(scsi_CDs[MINOR(cdi->dev)].device)) {
|
532 |
|
|
return -ENXIO;
|
533 |
|
|
}
|
534 |
|
|
scsi_CDs[MINOR(cdi->dev)].device->access_count++;
|
535 |
|
|
if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
|
536 |
|
|
__MOD_INC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
|
537 |
|
|
if (sr_template.module)
|
538 |
|
|
__MOD_INC_USE_COUNT(sr_template.module);
|
539 |
|
|
|
540 |
|
|
/* If this device did not have media in the drive at boot time, then
|
541 |
|
|
* we would have been unable to get the sector size. Check to see if
|
542 |
|
|
* this is the case, and try again.
|
543 |
|
|
*/
|
544 |
|
|
|
545 |
|
|
if (scsi_CDs[MINOR(cdi->dev)].needs_sector_size)
|
546 |
|
|
get_sectorsize(MINOR(cdi->dev));
|
547 |
|
|
|
548 |
|
|
return 0;
|
549 |
|
|
}
|
550 |
|
|
|
551 |
|
|
static int sr_detect(Scsi_Device * SDp)
|
552 |
|
|
{
|
553 |
|
|
|
554 |
|
|
if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
|
555 |
|
|
return 0;
|
556 |
|
|
sr_template.dev_noticed++;
|
557 |
|
|
return 1;
|
558 |
|
|
}
|
559 |
|
|
|
560 |
|
|
static int sr_attach(Scsi_Device * SDp)
|
561 |
|
|
{
|
562 |
|
|
Scsi_CD *cpnt;
|
563 |
|
|
int i;
|
564 |
|
|
|
565 |
|
|
if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
|
566 |
|
|
return 1;
|
567 |
|
|
|
568 |
|
|
if (sr_template.nr_dev >= sr_template.dev_max) {
|
569 |
|
|
SDp->attached--;
|
570 |
|
|
return 1;
|
571 |
|
|
}
|
572 |
|
|
for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
|
573 |
|
|
if (!cpnt->device)
|
574 |
|
|
break;
|
575 |
|
|
|
576 |
|
|
if (i >= sr_template.dev_max)
|
577 |
|
|
panic("scsi_devices corrupt (sr)");
|
578 |
|
|
|
579 |
|
|
|
580 |
|
|
scsi_CDs[i].device = SDp;
|
581 |
|
|
|
582 |
|
|
sr_template.nr_dev++;
|
583 |
|
|
if (sr_template.nr_dev > sr_template.dev_max)
|
584 |
|
|
panic("scsi_devices corrupt (sr)");
|
585 |
|
|
|
586 |
|
|
printk("Attached scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n",
|
587 |
|
|
i, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
|
588 |
|
|
return 0;
|
589 |
|
|
}
|
590 |
|
|
|
591 |
|
|
|
592 |
|
|
void get_sectorsize(int i)
|
593 |
|
|
{
|
594 |
|
|
unsigned char cmd[10];
|
595 |
|
|
unsigned char *buffer;
|
596 |
|
|
int the_result, retries;
|
597 |
|
|
int sector_size;
|
598 |
|
|
Scsi_Request *SRpnt;
|
599 |
|
|
|
600 |
|
|
buffer = (unsigned char *) scsi_malloc(512);
|
601 |
|
|
SRpnt = scsi_allocate_request(scsi_CDs[i].device);
|
602 |
|
|
|
603 |
|
|
if(buffer == NULL || SRpnt == NULL)
|
604 |
|
|
{
|
605 |
|
|
scsi_CDs[i].capacity = 0x1fffff;
|
606 |
|
|
sector_size = 2048; /* A guess, just in case */
|
607 |
|
|
scsi_CDs[i].needs_sector_size = 1;
|
608 |
|
|
if(buffer)
|
609 |
|
|
scsi_free(buffer, 512);
|
610 |
|
|
if(SRpnt)
|
611 |
|
|
scsi_release_request(SRpnt);
|
612 |
|
|
return;
|
613 |
|
|
}
|
614 |
|
|
|
615 |
|
|
retries = 3;
|
616 |
|
|
do {
|
617 |
|
|
cmd[0] = READ_CAPACITY;
|
618 |
|
|
cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
|
619 |
|
|
((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
|
620 |
|
|
memset((void *) &cmd[2], 0, 8);
|
621 |
|
|
SRpnt->sr_request.rq_status = RQ_SCSI_BUSY; /* Mark as really busy */
|
622 |
|
|
SRpnt->sr_cmd_len = 0;
|
623 |
|
|
|
624 |
|
|
memset(buffer, 0, 8);
|
625 |
|
|
|
626 |
|
|
/* Do the command and wait.. */
|
627 |
|
|
|
628 |
|
|
SRpnt->sr_data_direction = SCSI_DATA_READ;
|
629 |
|
|
scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer,
|
630 |
|
|
8, SR_TIMEOUT, MAX_RETRIES);
|
631 |
|
|
|
632 |
|
|
the_result = SRpnt->sr_result;
|
633 |
|
|
retries--;
|
634 |
|
|
|
635 |
|
|
} while (the_result && retries);
|
636 |
|
|
|
637 |
|
|
|
638 |
|
|
scsi_release_request(SRpnt);
|
639 |
|
|
SRpnt = NULL;
|
640 |
|
|
|
641 |
|
|
if (the_result) {
|
642 |
|
|
scsi_CDs[i].capacity = 0x1fffff;
|
643 |
|
|
sector_size = 2048; /* A guess, just in case */
|
644 |
|
|
scsi_CDs[i].needs_sector_size = 1;
|
645 |
|
|
} else {
|
646 |
|
|
#if 0
|
647 |
|
|
if (cdrom_get_last_written(MKDEV(MAJOR_NR, i),
|
648 |
|
|
&scsi_CDs[i].capacity))
|
649 |
|
|
#endif
|
650 |
|
|
scsi_CDs[i].capacity = 1 + ((buffer[0] << 24) |
|
651 |
|
|
(buffer[1] << 16) |
|
652 |
|
|
(buffer[2] << 8) |
|
653 |
|
|
buffer[3]);
|
654 |
|
|
sector_size = (buffer[4] << 24) |
|
655 |
|
|
(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
|
656 |
|
|
switch (sector_size) {
|
657 |
|
|
/*
|
658 |
|
|
* HP 4020i CD-Recorder reports 2340 byte sectors
|
659 |
|
|
* Philips CD-Writers report 2352 byte sectors
|
660 |
|
|
*
|
661 |
|
|
* Use 2k sectors for them..
|
662 |
|
|
*/
|
663 |
|
|
case 0:
|
664 |
|
|
case 2340:
|
665 |
|
|
case 2352:
|
666 |
|
|
sector_size = 2048;
|
667 |
|
|
/* fall through */
|
668 |
|
|
case 2048:
|
669 |
|
|
scsi_CDs[i].capacity *= 4;
|
670 |
|
|
/* fall through */
|
671 |
|
|
case 512:
|
672 |
|
|
break;
|
673 |
|
|
default:
|
674 |
|
|
printk("sr%d: unsupported sector size %d.\n",
|
675 |
|
|
i, sector_size);
|
676 |
|
|
scsi_CDs[i].capacity = 0;
|
677 |
|
|
scsi_CDs[i].needs_sector_size = 1;
|
678 |
|
|
}
|
679 |
|
|
|
680 |
|
|
scsi_CDs[i].device->sector_size = sector_size;
|
681 |
|
|
|
682 |
|
|
/*
|
683 |
|
|
* Add this so that we have the ability to correctly gauge
|
684 |
|
|
* what the device is capable of.
|
685 |
|
|
*/
|
686 |
|
|
scsi_CDs[i].needs_sector_size = 0;
|
687 |
|
|
sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
|
688 |
|
|
};
|
689 |
|
|
scsi_free(buffer, 512);
|
690 |
|
|
}
|
691 |
|
|
|
692 |
|
|
void get_capabilities(int i)
|
693 |
|
|
{
|
694 |
|
|
unsigned char cmd[6];
|
695 |
|
|
unsigned char *buffer;
|
696 |
|
|
int rc, n;
|
697 |
|
|
|
698 |
|
|
static char *loadmech[] =
|
699 |
|
|
{
|
700 |
|
|
"caddy",
|
701 |
|
|
"tray",
|
702 |
|
|
"pop-up",
|
703 |
|
|
"",
|
704 |
|
|
"changer",
|
705 |
|
|
"cartridge changer",
|
706 |
|
|
"",
|
707 |
|
|
""
|
708 |
|
|
};
|
709 |
|
|
|
710 |
|
|
buffer = (unsigned char *) scsi_malloc(512);
|
711 |
|
|
if (!buffer)
|
712 |
|
|
{
|
713 |
|
|
printk(KERN_ERR "sr: out of memory.\n");
|
714 |
|
|
return;
|
715 |
|
|
}
|
716 |
|
|
cmd[0] = MODE_SENSE;
|
717 |
|
|
cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
|
718 |
|
|
((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
|
719 |
|
|
cmd[2] = 0x2a;
|
720 |
|
|
cmd[4] = 128;
|
721 |
|
|
cmd[3] = cmd[5] = 0;
|
722 |
|
|
rc = sr_do_ioctl(i, cmd, buffer, 128, 1, SCSI_DATA_READ, NULL);
|
723 |
|
|
|
724 |
|
|
if (rc) {
|
725 |
|
|
/* failed, drive doesn't have capabilities mode page */
|
726 |
|
|
scsi_CDs[i].cdi.speed = 1;
|
727 |
|
|
scsi_CDs[i].cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
|
728 |
|
|
CDC_DVD | CDC_DVD_RAM |
|
729 |
|
|
CDC_SELECT_DISC | CDC_SELECT_SPEED);
|
730 |
|
|
scsi_free(buffer, 512);
|
731 |
|
|
printk("sr%i: scsi-1 drive\n", i);
|
732 |
|
|
return;
|
733 |
|
|
}
|
734 |
|
|
n = buffer[3] + 4;
|
735 |
|
|
scsi_CDs[i].cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
|
736 |
|
|
scsi_CDs[i].readcd_known = 1;
|
737 |
|
|
scsi_CDs[i].readcd_cdda = buffer[n + 5] & 0x01;
|
738 |
|
|
/* print some capability bits */
|
739 |
|
|
printk("sr%i: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", i,
|
740 |
|
|
((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
|
741 |
|
|
scsi_CDs[i].cdi.speed,
|
742 |
|
|
buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
|
743 |
|
|
buffer[n + 3] & 0x20 ? "dvd-ram " : "",
|
744 |
|
|
buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
|
745 |
|
|
buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
|
746 |
|
|
buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
|
747 |
|
|
loadmech[buffer[n + 6] >> 5]);
|
748 |
|
|
if ((buffer[n + 6] >> 5) == 0)
|
749 |
|
|
/* caddy drives can't close tray... */
|
750 |
|
|
scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY;
|
751 |
|
|
if ((buffer[n + 2] & 0x8) == 0)
|
752 |
|
|
/* not a DVD drive */
|
753 |
|
|
scsi_CDs[i].cdi.mask |= CDC_DVD;
|
754 |
|
|
if ((buffer[n + 3] & 0x20) == 0) {
|
755 |
|
|
/* can't write DVD-RAM media */
|
756 |
|
|
scsi_CDs[i].cdi.mask |= CDC_DVD_RAM;
|
757 |
|
|
} else {
|
758 |
|
|
scsi_CDs[i].device->writeable = 1;
|
759 |
|
|
}
|
760 |
|
|
if ((buffer[n + 3] & 0x10) == 0)
|
761 |
|
|
/* can't write DVD-R media */
|
762 |
|
|
scsi_CDs[i].cdi.mask |= CDC_DVD_R;
|
763 |
|
|
if ((buffer[n + 3] & 0x2) == 0)
|
764 |
|
|
/* can't write CD-RW media */
|
765 |
|
|
scsi_CDs[i].cdi.mask |= CDC_CD_RW;
|
766 |
|
|
if ((buffer[n + 3] & 0x1) == 0)
|
767 |
|
|
/* can't write CD-R media */
|
768 |
|
|
scsi_CDs[i].cdi.mask |= CDC_CD_R;
|
769 |
|
|
if ((buffer[n + 6] & 0x8) == 0)
|
770 |
|
|
/* can't eject */
|
771 |
|
|
scsi_CDs[i].cdi.mask |= CDC_OPEN_TRAY;
|
772 |
|
|
|
773 |
|
|
if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
|
774 |
|
|
(buffer[n + 6] >> 5) == mechtype_cartridge_changer)
|
775 |
|
|
scsi_CDs[i].cdi.capacity =
|
776 |
|
|
cdrom_number_of_slots(&(scsi_CDs[i].cdi));
|
777 |
|
|
if (scsi_CDs[i].cdi.capacity <= 1)
|
778 |
|
|
/* not a changer */
|
779 |
|
|
scsi_CDs[i].cdi.mask |= CDC_SELECT_DISC;
|
780 |
|
|
/*else I don't think it can close its tray
|
781 |
|
|
scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; */
|
782 |
|
|
|
783 |
|
|
scsi_free(buffer, 512);
|
784 |
|
|
}
|
785 |
|
|
|
786 |
|
|
/*
|
787 |
|
|
* sr_packet() is the entry point for the generic commands generated
|
788 |
|
|
* by the Uniform CD-ROM layer.
|
789 |
|
|
*/
|
790 |
|
|
static int sr_packet(struct cdrom_device_info *cdi, struct cdrom_generic_command *cgc)
|
791 |
|
|
{
|
792 |
|
|
Scsi_Device *device = scsi_CDs[MINOR(cdi->dev)].device;
|
793 |
|
|
|
794 |
|
|
/* set the LUN */
|
795 |
|
|
if (device->scsi_level <= SCSI_2)
|
796 |
|
|
cgc->cmd[1] |= device->lun << 5;
|
797 |
|
|
|
798 |
|
|
cgc->stat = sr_do_ioctl(MINOR(cdi->dev), cgc->cmd, cgc->buffer, cgc->buflen, cgc->quiet, cgc->data_direction, cgc->sense);
|
799 |
|
|
|
800 |
|
|
return cgc->stat;
|
801 |
|
|
}
|
802 |
|
|
|
803 |
|
|
static int sr_registered;
|
804 |
|
|
|
805 |
|
|
static int sr_init()
|
806 |
|
|
{
|
807 |
|
|
int i;
|
808 |
|
|
|
809 |
|
|
if (sr_template.dev_noticed == 0)
|
810 |
|
|
return 0;
|
811 |
|
|
|
812 |
|
|
if (!sr_registered) {
|
813 |
|
|
if (devfs_register_blkdev(MAJOR_NR, "sr", &sr_bdops)) {
|
814 |
|
|
printk("Unable to get major %d for SCSI-CD\n", MAJOR_NR);
|
815 |
|
|
sr_template.dev_noticed = 0;
|
816 |
|
|
return 1;
|
817 |
|
|
}
|
818 |
|
|
sr_registered++;
|
819 |
|
|
}
|
820 |
|
|
if (scsi_CDs)
|
821 |
|
|
return 0;
|
822 |
|
|
|
823 |
|
|
sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS;
|
824 |
|
|
scsi_CDs = kmalloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC);
|
825 |
|
|
if (!scsi_CDs)
|
826 |
|
|
goto cleanup_devfs;
|
827 |
|
|
memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD));
|
828 |
|
|
|
829 |
|
|
sr_sizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
|
830 |
|
|
if (!sr_sizes)
|
831 |
|
|
goto cleanup_cds;
|
832 |
|
|
memset(sr_sizes, 0, sr_template.dev_max * sizeof(int));
|
833 |
|
|
|
834 |
|
|
sr_blocksizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
|
835 |
|
|
if (!sr_blocksizes)
|
836 |
|
|
goto cleanup_sizes;
|
837 |
|
|
|
838 |
|
|
sr_hardsizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
|
839 |
|
|
if (!sr_hardsizes)
|
840 |
|
|
goto cleanup_blocksizes;
|
841 |
|
|
/*
|
842 |
|
|
* These are good guesses for the time being.
|
843 |
|
|
*/
|
844 |
|
|
for (i = 0; i < sr_template.dev_max; i++) {
|
845 |
|
|
sr_blocksizes[i] = 2048;
|
846 |
|
|
sr_hardsizes[i] = 2048;
|
847 |
|
|
}
|
848 |
|
|
blksize_size[MAJOR_NR] = sr_blocksizes;
|
849 |
|
|
hardsect_size[MAJOR_NR] = sr_hardsizes;
|
850 |
|
|
return 0;
|
851 |
|
|
cleanup_blocksizes:
|
852 |
|
|
kfree(sr_blocksizes);
|
853 |
|
|
cleanup_sizes:
|
854 |
|
|
kfree(sr_sizes);
|
855 |
|
|
cleanup_cds:
|
856 |
|
|
kfree(scsi_CDs);
|
857 |
|
|
scsi_CDs = NULL;
|
858 |
|
|
cleanup_devfs:
|
859 |
|
|
devfs_unregister_blkdev(MAJOR_NR, "sr");
|
860 |
|
|
sr_template.dev_noticed = 0;
|
861 |
|
|
sr_registered--;
|
862 |
|
|
return 1;
|
863 |
|
|
}
|
864 |
|
|
|
865 |
|
|
void sr_finish()
|
866 |
|
|
{
|
867 |
|
|
int i;
|
868 |
|
|
char name[6];
|
869 |
|
|
|
870 |
|
|
blk_dev[MAJOR_NR].queue = sr_find_queue;
|
871 |
|
|
blk_size[MAJOR_NR] = sr_sizes;
|
872 |
|
|
|
873 |
|
|
for (i = 0; i < sr_template.nr_dev; ++i) {
|
874 |
|
|
/* If we have already seen this, then skip it. Comes up
|
875 |
|
|
* with loadable modules. */
|
876 |
|
|
if (scsi_CDs[i].capacity)
|
877 |
|
|
continue;
|
878 |
|
|
scsi_CDs[i].capacity = 0x1fffff;
|
879 |
|
|
scsi_CDs[i].device->sector_size = 2048; /* A guess, just in case */
|
880 |
|
|
scsi_CDs[i].needs_sector_size = 1;
|
881 |
|
|
scsi_CDs[i].device->changed = 1; /* force recheck CD type */
|
882 |
|
|
#if 0
|
883 |
|
|
/* seems better to leave this for later */
|
884 |
|
|
get_sectorsize(i);
|
885 |
|
|
printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size);
|
886 |
|
|
#endif
|
887 |
|
|
scsi_CDs[i].use = 1;
|
888 |
|
|
|
889 |
|
|
scsi_CDs[i].device->ten = 1;
|
890 |
|
|
scsi_CDs[i].device->remap = 1;
|
891 |
|
|
scsi_CDs[i].readcd_known = 0;
|
892 |
|
|
scsi_CDs[i].readcd_cdda = 0;
|
893 |
|
|
sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
|
894 |
|
|
|
895 |
|
|
scsi_CDs[i].cdi.ops = &sr_dops;
|
896 |
|
|
scsi_CDs[i].cdi.handle = &scsi_CDs[i];
|
897 |
|
|
scsi_CDs[i].cdi.dev = MKDEV(MAJOR_NR, i);
|
898 |
|
|
scsi_CDs[i].cdi.mask = 0;
|
899 |
|
|
scsi_CDs[i].cdi.capacity = 1;
|
900 |
|
|
/*
|
901 |
|
|
* FIXME: someone needs to handle a get_capabilities
|
902 |
|
|
* failure properly ??
|
903 |
|
|
*/
|
904 |
|
|
get_capabilities(i);
|
905 |
|
|
sr_vendor_init(i);
|
906 |
|
|
|
907 |
|
|
sprintf(name, "sr%d", i);
|
908 |
|
|
strcpy(scsi_CDs[i].cdi.name, name);
|
909 |
|
|
scsi_CDs[i].cdi.de =
|
910 |
|
|
devfs_register (scsi_CDs[i].device->de, "cd",
|
911 |
|
|
DEVFS_FL_DEFAULT, MAJOR_NR, i,
|
912 |
|
|
S_IFBLK | S_IRUGO | S_IWUGO,
|
913 |
|
|
&sr_bdops, NULL);
|
914 |
|
|
register_cdrom(&scsi_CDs[i].cdi);
|
915 |
|
|
}
|
916 |
|
|
|
917 |
|
|
|
918 |
|
|
/* If our host adapter is capable of scatter-gather, then we increase
|
919 |
|
|
* the read-ahead to 16 blocks (32 sectors). If not, we use
|
920 |
|
|
* a two block (4 sector) read ahead. */
|
921 |
|
|
if (scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize)
|
922 |
|
|
read_ahead[MAJOR_NR] = 32; /* 32 sector read-ahead. Always removable. */
|
923 |
|
|
else
|
924 |
|
|
read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */
|
925 |
|
|
|
926 |
|
|
return;
|
927 |
|
|
}
|
928 |
|
|
|
929 |
|
|
static void sr_detach(Scsi_Device * SDp)
|
930 |
|
|
{
|
931 |
|
|
Scsi_CD *cpnt;
|
932 |
|
|
int i;
|
933 |
|
|
|
934 |
|
|
if (scsi_CDs == NULL)
|
935 |
|
|
return;
|
936 |
|
|
for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
|
937 |
|
|
if (cpnt->device == SDp) {
|
938 |
|
|
/*
|
939 |
|
|
* Since the cdrom is read-only, no need to sync the device.
|
940 |
|
|
* We should be kind to our buffer cache, however.
|
941 |
|
|
*/
|
942 |
|
|
invalidate_device(MKDEV(MAJOR_NR, i), 0);
|
943 |
|
|
|
944 |
|
|
/*
|
945 |
|
|
* Reset things back to a sane state so that one can re-load a new
|
946 |
|
|
* driver (perhaps the same one).
|
947 |
|
|
*/
|
948 |
|
|
unregister_cdrom(&(cpnt->cdi));
|
949 |
|
|
cpnt->device = NULL;
|
950 |
|
|
cpnt->capacity = 0;
|
951 |
|
|
SDp->attached--;
|
952 |
|
|
sr_template.nr_dev--;
|
953 |
|
|
sr_template.dev_noticed--;
|
954 |
|
|
sr_sizes[i] = 0;
|
955 |
|
|
return;
|
956 |
|
|
}
|
957 |
|
|
return;
|
958 |
|
|
}
|
959 |
|
|
|
960 |
|
|
static int __init init_sr(void)
|
961 |
|
|
{
|
962 |
|
|
sr_template.module = THIS_MODULE;
|
963 |
|
|
return scsi_register_module(MODULE_SCSI_DEV, &sr_template);
|
964 |
|
|
}
|
965 |
|
|
|
966 |
|
|
static void __exit exit_sr(void)
|
967 |
|
|
{
|
968 |
|
|
scsi_unregister_module(MODULE_SCSI_DEV, &sr_template);
|
969 |
|
|
devfs_unregister_blkdev(MAJOR_NR, "sr");
|
970 |
|
|
sr_registered--;
|
971 |
|
|
if (scsi_CDs != NULL) {
|
972 |
|
|
kfree(scsi_CDs);
|
973 |
|
|
|
974 |
|
|
kfree(sr_sizes);
|
975 |
|
|
sr_sizes = NULL;
|
976 |
|
|
|
977 |
|
|
kfree(sr_blocksizes);
|
978 |
|
|
sr_blocksizes = NULL;
|
979 |
|
|
kfree(sr_hardsizes);
|
980 |
|
|
sr_hardsizes = NULL;
|
981 |
|
|
}
|
982 |
|
|
blksize_size[MAJOR_NR] = NULL;
|
983 |
|
|
hardsect_size[MAJOR_NR] = NULL;
|
984 |
|
|
blk_size[MAJOR_NR] = NULL;
|
985 |
|
|
read_ahead[MAJOR_NR] = 0;
|
986 |
|
|
|
987 |
|
|
sr_template.dev_max = 0;
|
988 |
|
|
}
|
989 |
|
|
|
990 |
|
|
module_init(init_sr);
|
991 |
|
|
module_exit(exit_sr);
|
992 |
|
|
MODULE_LICENSE("GPL");
|