sg.c File Reference

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/moduleparam.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/seq_file.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/blktrace_api.h>
#include <linux/mutex.h>
#include <linux/ratelimit.h>
#include "scsi.h"
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/sg.h>
#include "scsi_logging.h"

Go to the source code of this file.

Data Structures
struct	sg_scatter_hold
struct	sg_request
struct	sg_fd
struct	sg_device

Macros
#define	SG_VERSION_STR   "3.5.34"
#define	SG_ALLOW_DIO_DEF   0
#define	SG_MAX_DEVS   32768
#define	MULDIV(X, MUL, DIV)   ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
#define	SG_DEFAULT_TIMEOUT   MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
#define	SG_SECTOR_SZ   512
#define	SZ_SG_HEADER   sizeof(struct sg_header)
#define	SZ_SG_IO_HDR   sizeof(sg_io_hdr_t)
#define	SZ_SG_IOVEC   sizeof(sg_iovec_t)
#define	SZ_SG_REQ_INFO   sizeof(sg_req_info_t)

Typedefs
typedef struct sg_scatter_hold	Sg_scatter_hold
typedef struct sg_request	Sg_request
typedef struct sg_fd	Sg_fd
typedef struct sg_device	Sg_device

Functions
	module_param_named (scatter_elem_sz, scatter_elem_sz, int, S_IRUGO|S_IWUSR)
	module_param_named (def_reserved_size, def_reserved_size, int, S_IRUGO|S_IWUSR)
	module_param_named (allow_dio, sg_allow_dio, int, S_IRUGO|S_IWUSR)
	MODULE_AUTHOR ("Douglas Gilbert")
	MODULE_DESCRIPTION ("SCSI generic (sg) driver")
	MODULE_LICENSE ("GPL")
	MODULE_VERSION (SG_VERSION_STR)
	MODULE_ALIAS_CHARDEV_MAJOR (SCSI_GENERIC_MAJOR)
	MODULE_PARM_DESC (scatter_elem_sz,"scatter gather element ""size (default: max(SG_SCATTER_SZ, PAGE_SIZE))")
	MODULE_PARM_DESC (def_reserved_size,"size of buffer reserved for each fd")
	MODULE_PARM_DESC (allow_dio,"allow direct I/O (default: 0 (disallow))")
	module_init (init_sg)
	module_exit (exit_sg)

Variables
int	sg_big_buff = SG_DEF_RESERVED_SIZE

Macro Definition Documentation

#define MULDIV	(		X,
			MUL,
			DIV
	)		((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))

Definition at line 85 of file sg.c.

#define SG_ALLOW_DIO_DEF   0

Definition at line 72 of file sg.c.

#define SG_DEFAULT_TIMEOUT   MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)

Definition at line 87 of file sg.c.

#define SG_MAX_DEVS   32768

Definition at line 74 of file sg.c.

#define SG_SECTOR_SZ   512

Definition at line 102 of file sg.c.

#define SG_VERSION_STR   "3.5.34"

Definition at line 22 of file sg.c.

#define SZ_SG_HEADER   sizeof(struct sg_header)

Definition at line 212 of file sg.c.

#define SZ_SG_IO_HDR   sizeof(sg_io_hdr_t)

Definition at line 213 of file sg.c.

#define SZ_SG_IOVEC   sizeof(sg_iovec_t)

Definition at line 214 of file sg.c.

#define SZ_SG_REQ_INFO   sizeof(sg_req_info_t)

Definition at line 215 of file sg.c.

Typedef Documentation

typedef struct sg_device Sg_device

typedef struct sg_fd Sg_fd

typedef struct sg_request Sg_request

typedef struct sg_scatter_hold Sg_scatter_hold

Function Documentation

MODULE_ALIAS_CHARDEV_MAJOR

(

SCSI_GENERIC_MAJOR

)

MODULE_AUTHOR

(

"Douglas Gilbert"

)

MODULE_DESCRIPTION

(

"SCSI generic (sg) driver"

)

module_exit

(

exit_sg

)

module_init

(

init_sg

)

MODULE_LICENSE

(

"GPL"

)

module_param_named	(	scatter_elem_sz	,
		scatter_elem_sz	,
		int	,
		S_IRUGO|	S_IWUSR
	)

module_param_named	(	def_reserved_size	,
		def_reserved_size	,
		int	,
		S_IRUGO|	S_IWUSR
	)

module_param_named	(	allow_dio	,
		sg_allow_dio	,
		int	,
		S_IRUGO|	S_IWUSR
	)

MODULE_PARM_DESC	(	scatter_elem_sz	,
		"scatter gather element ""size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"
	)

MODULE_PARM_DESC	(	def_reserved_size	,
		"size of buffer reserved for each fd"
	)

MODULE_PARM_DESC	(	allow_dio	,
		"allow direct I/O (default: 0 (disallow))"
	)

MODULE_VERSION

(

SG_VERSION_STR

)

Variable Documentation

int sg_big_buff = SG_DEF_RESERVED_SIZE

Definition at line 89 of file sg.c.