drivers/scsi/sd_ioctl.c

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 1 /*
 2  * drivers/scsi/sd_ioctl.c
 3  *
 4  * ioctl handling for SCSI disks
 5  */
 6
 7 #include <linux/kernel.h>
 8 #include <linux/sched.h>
 9 #include <linux/mm.h>
 10 #include <linux/fs.h>
 11 #include <linux/hdreg.h>
 12 #include <linux/errno.h>
 13
 14 #include <asm/uaccess.h>
 15
 16 #define MAJOR_NR SCSI_DISK0_MAJOR
 17 #include <linux/blk.h>
 18 #include <linux/blkpg.h>
 19 #include"scsi.h"
 20 #include <scsi/scsi_ioctl.h>
 21 #include"hosts.h"
 22 #include"sd.h"
 23 #include <scsi/scsicam.h>/* must follow "hosts.h" */
 24
 25 intsd_ioctl(struct inode * inode,struct file * file,unsigned int cmd,unsigned long arg)
 26 {
 27  kdev_t dev = inode->i_rdev;
 28 int error;
 29 struct Scsi_Host * host;
 30  Scsi_Device * SDev;
 31 int diskinfo[4];
 32 struct hd_geometry *loc = (struct hd_geometry *) arg;
 33
 34  SDev = rscsi_disks[DEVICE_NR(dev)].device;
 35 /*
 36  * If we are in the middle of error recovery, don't let anyone
 37  * else try and use this device. Also, if error recovery fails, it
 38  * may try and take the device offline, in which case all further
 39  * access to the device is prohibited.
 40  */
 41 if( !scsi_block_when_processing_errors(SDev) )
 42 {
 43 return-ENODEV;
 44 }
 45
 46 switch(cmd) {
 47 case HDIO_GETGEO:/* Return BIOS disk parameters */
 48 if(!loc)return-EINVAL;
 49  error =verify_area(VERIFY_WRITE, loc,sizeof(*loc));
 50 if(error)
 51 return error;
 52  host = rscsi_disks[DEVICE_NR(dev)].device->host;
 53
 54 /* default to most commonly used values */
 55
 56  diskinfo[0] =0x40;
 57  diskinfo[1] =0x20;
 58  diskinfo[2] = rscsi_disks[DEVICE_NR(dev)].capacity >>11;
 59
 60 /* override with calculated, extended default, or driver values */
 61
 62 if(host->hostt->bios_param != NULL)
 63  host->hostt->bios_param(&rscsi_disks[DEVICE_NR(dev)],
 64  dev,
 65 &diskinfo[0]);
 66 elsescsicam_bios_param(&rscsi_disks[DEVICE_NR(dev)],
 67  dev, &diskinfo[0]);
 68
 69 put_user(diskinfo[0], &loc->heads);
 70 put_user(diskinfo[1], &loc->sectors);
 71 put_user(diskinfo[2], &loc->cylinders);
 72 put_user(sd[SD_PARTITION(inode->i_rdev)].start_sect, &loc->start);
 73 return0;
 74 case BLKGETSIZE:/* Return device size */
 75 if(!arg)return-EINVAL;
 76  error =verify_area(VERIFY_WRITE, (long*) arg,sizeof(long));
 77 if(error)
 78 return error;
 79 put_user(sd[SD_PARTITION(inode->i_rdev)].nr_sects,
 80 (long*) arg);
 81 return0;
 82
 83 case BLKROSET:
 84 case BLKROGET:
 85 case BLKRASET:
 86 case BLKRAGET:
 87 case BLKFLSBUF:
 88 case BLKSSZGET:
 89 case BLKPG:
 90 returnblk_ioctl(inode->i_rdev, cmd, arg);
 91
 92 case BLKRRPART:/* Re-read partition tables */
 93 if(!capable(CAP_SYS_ADMIN))
 94 return-EACCES;
 95 returnrevalidate_scsidisk(dev,1);
 96
 97 default:
 98 returnscsi_ioctl(rscsi_disks[DEVICE_NR(dev)].device , cmd, (void*) arg);
 99 }
 100 }
 101
 102 /*
 103  * Overrides for Emacs so that we follow Linus's tabbing style.
 104  * Emacs will notice this stuff at the end of the file and automatically
 105  * adjust the settings for this buffer only. This must remain at the end
 106  * of the file.
 107  * ---------------------------------------------------------------------------
 108  * Local variables:
 109  * c-indent-level: 4
 110  * c-brace-imaginary-offset: 0
 111  * c-brace-offset: -4
 112  * c-argdecl-indent: 4
 113  * c-label-offset: -4
 114  * c-continued-statement-offset: 4
 115  * c-continued-brace-offset: 0
 116  * indent-tabs-mode: nil
 117  * tab-width: 8
 118  * End:
 119  */