cregit-Linux how code gets into the kernel

Release 4.12 include/linux/pktcdvd.h

Directory: include/linux
/*
 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
 * DVD-RW devices.
 *
 */
#ifndef __PKTCDVD_H

#define __PKTCDVD_H

#include <linux/blkdev.h>
#include <linux/completion.h>
#include <linux/cdrom.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/mempool.h>
#include <uapi/linux/pktcdvd.h>

/* default bio write queue congestion marks */

#define PKT_WRITE_CONGESTION_ON    10000

#define PKT_WRITE_CONGESTION_OFF   9000



struct packet_settings
{
	
__u32			size;		/* packet size in (512 byte) sectors */
	
__u8			fp;		/* fixed packets */
	
__u8			link_loss;	/* the rest is specified
                                                 * as per Mt Fuji */
	
__u8			write_type;
	
__u8			track_mode;
	
__u8			block_mode;
};

/*
 * Very crude stats for now
 */

struct packet_stats
{
	
unsigned long		pkt_started;
	
unsigned long		pkt_ended;
	
unsigned long		secs_w;
	
unsigned long		secs_rg;
	
unsigned long		secs_r;
};


struct packet_cdrw
{
	
struct list_head	pkt_free_list;
	
struct list_head	pkt_active_list;
	
spinlock_t		active_list_lock; /* Serialize access to pkt_active_list */
	
struct task_struct	*thread;
	
atomic_t		pending_bios;
};

/*
 * Switch to high speed reading after reading this many kilobytes
 * with no interspersed writes.
 */

#define HI_SPEED_SWITCH 512


struct packet_iosched
{
	
atomic_t		attention;	/* Set to non-zero when queue processing is needed */
	
int			writing;	/* Non-zero when writing, zero when reading */
	
spinlock_t		lock;		/* Protecting read/write queue manipulations */
	
struct bio_list		read_queue;
	
struct bio_list		write_queue;
	
sector_t		last_write;	/* The sector where the last write ended */
	
int			successive_reads;
};

/*
 * 32 buffers of 2048 bytes
 */
#if (PAGE_SIZE % CD_FRAMESIZE) != 0
#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
#endif

#define PACKET_MAX_SIZE		128

#define FRAMES_PER_PAGE		(PAGE_SIZE / CD_FRAMESIZE)

#define PACKET_MAX_SECTORS	(PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)


enum packet_data_state {
	
PACKET_IDLE_STATE,			/* Not used at the moment */
	
PACKET_WAITING_STATE,			/* Waiting for more bios to arrive, so */
						/* we don't have to do as much */
						/* data gathering */
	
PACKET_READ_WAIT_STATE,			/* Waiting for reads to fill in holes */
	
PACKET_WRITE_WAIT_STATE,		/* Waiting for the write to complete */
	
PACKET_RECOVERY_STATE,			/* Recover after read/write errors */
	
PACKET_FINISHED_STATE,			/* After write has finished */

	
PACKET_NUM_STATES			/* Number of possible states */
};

/*
 * Information needed for writing a single packet
 */
struct pktcdvd_device;


struct packet_data
{
	
struct list_head	list;

	
spinlock_t		lock;		/* Lock protecting state transitions and */
						/* orig_bios list */

	
struct bio_list		orig_bios;	/* Original bios passed to pkt_make_request */
						/* that will be handled by this packet */
	
int			write_size;	/* Total size of all bios in the orig_bios */
						/* list, measured in number of frames */

	
struct bio		*w_bio;		/* The bio we will send to the real CD */
						/* device once we have all data for the */
						/* packet we are going to write */
	
sector_t		sector;		/* First sector in this packet */
	
int			frames;		/* Number of frames in this packet */

	
enum packet_data_state	state;		/* Current state */
	
atomic_t		run_sm;		/* Incremented whenever the state */
						/* machine needs to be run */
	
long			sleep_time;	/* Set this to non-zero to make the state */
						/* machine run after this many jiffies. */

	
atomic_t		io_wait;	/* Number of pending IO operations */
	
atomic_t		io_errors;	/* Number of read/write errors during IO */

	
struct bio		*r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
	
struct page		*pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];

	
int			cache_valid;	/* If non-zero, the data for the zone defined */
						/* by the sector variable is completely cached */
						/* in the pages[] vector. */

	
int			id;		/* ID number for debugging */
	
struct pktcdvd_device	*pd;
};


struct pkt_rb_node {
	
struct rb_node		rb_node;
	
struct bio		*bio;
};


struct packet_stacked_data
{
	
struct bio		*bio;		/* Original read request bio */
	
struct pktcdvd_device	*pd;
};

#define PSD_POOL_SIZE		64


struct pktcdvd_kobj
{
	
struct kobject		kobj;
	
struct pktcdvd_device	*pd;
};

#define to_pktcdvdkobj(_k) \
  ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))


struct pktcdvd_device
{
	
struct block_device	*bdev;		/* dev attached */
	
dev_t			pkt_dev;	/* our dev */
	
char			name[20];
	
struct packet_settings	settings;
	
struct packet_stats	stats;
	
int			refcnt;		/* Open count */
	
int			write_speed;	/* current write speed, kB/s */
	
int			read_speed;	/* current read speed, kB/s */
	
unsigned long		offset;		/* start offset */
	
__u8			mode_offset;	/* 0 / 8 */
	
__u8			type;
	
unsigned long		flags;
	
__u16			mmc3_profile;
	
__u32			nwa;		/* next writable address */
	
__u32			lra;		/* last recorded address */
	
struct packet_cdrw	cdrw;
	
wait_queue_head_t	wqueue;

	
spinlock_t		lock;		/* Serialize access to bio_queue */
	
struct rb_root		bio_queue;	/* Work queue of bios we need to handle */
	
int			bio_queue_size;	/* Number of nodes in bio_queue */
	
sector_t		current_sector;	/* Keep track of where the elevator is */
	
atomic_t		scan_queue;	/* Set to non-zero when pkt_handle_queue */
						/* needs to be run. */
	
mempool_t		*rb_pool;	/* mempool for pkt_rb_node allocations */

	
struct packet_iosched   iosched;
	
struct gendisk		*disk;

	
int			write_congestion_off;
	
int			write_congestion_on;

	
struct device		*dev;		/* sysfs pktcdvd[0-7] dev */
	
struct pktcdvd_kobj	*kobj_stat;	/* sysfs pktcdvd[0-7]/stat/     */
	
struct pktcdvd_kobj	*kobj_wqueue;	/* sysfs pktcdvd[0-7]/write_queue/ */

	
struct dentry		*dfs_d_root;	/* debugfs: devname directory */
	
struct dentry		*dfs_f_info;	/* debugfs: info file */
};

#endif /* __PKTCDVD_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Peter Osterlund42983.63%433.33%
Thomas Maier7013.65%216.67%
Tony Jones30.58%18.33%
Alexander Beregalov30.58%18.33%
David Howells30.58%18.33%
Akinobu Mita30.58%18.33%
Phillip Susi20.39%216.67%
Total513100.00%12100.00%
Directory: include/linux
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