scsi_execute_req

int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,

                     int data_direction, void *buffer, unsigned bufflen,

                     struct scsi_sense_hdr *sshdr, int timeout, int retries)

scsi command code

include/scsi/scsi.h

READ_6   0x08

WRITE_6  0x0a

READ_10   0x28

WRITE_10  0x2a

READ_16   0x88

WRITE_16   0x8a

website about block driver

http://www.geocities.com/ravikiran_uvs/articles/

proc

read_proc

struct dentry *proc_lookup(struct inode * dir, struct dentry *dentry)

drivers/scsi/sd.c

the problem related to struct scsi_cmnd

struct scsi_cmnd

 /* These elements define the operation we are about to perform */

 #define MAX_COMMAND_SIZE        16

  unsigned char cmnd[MAX_COMMAND_SIZE];

sd_mod

remove sd_mod will delete /dev/sd*