Git Repo - qemu.git/blame_incremental

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Commit	Line	Data
	1	/*
	2	* QEMU System Emulator block driver
	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24	#ifndef BLOCK_INT_H
	25	#define BLOCK_INT_H
	26
	27	#include "block.h"
	28
	29	#define BLOCK_FLAG_ENCRYPT 1
	30	#define BLOCK_FLAG_COMPRESS 2
	31	#define BLOCK_FLAG_COMPAT6 4
	32
	33	struct BlockDriver {
	34	const char *format_name;
	35	int instance_size;
	36	int (bdrv_probe)(const uint8_t buf, int buf_size, const char *filename);
	37	int (bdrv_open)(BlockDriverState bs, const char *filename, int flags);
	38	int (bdrv_read)(BlockDriverState bs, int64_t sector_num,
	39	uint8_t *buf, int nb_sectors);
	40	int (bdrv_write)(BlockDriverState bs, int64_t sector_num,
	41	const uint8_t *buf, int nb_sectors);
	42	void (bdrv_close)(BlockDriverState bs);
	43	int (bdrv_create)(const char filename, int64_t total_sectors,
	44	const char *backing_file, int flags);
	45	void (bdrv_flush)(BlockDriverState bs);
	46	int (bdrv_is_allocated)(BlockDriverState bs, int64_t sector_num,
	47	int nb_sectors, int *pnum);
	48	int (bdrv_set_key)(BlockDriverState bs, const char *key);
	49	int (bdrv_make_empty)(BlockDriverState bs);
	50	/* aio */
	51	BlockDriverAIOCB (bdrv_aio_read)(BlockDriverState *bs,
	52	int64_t sector_num, uint8_t *buf, int nb_sectors,
	53	BlockDriverCompletionFunc cb, void opaque);
	54	BlockDriverAIOCB (bdrv_aio_write)(BlockDriverState *bs,
	55	int64_t sector_num, const uint8_t *buf, int nb_sectors,
	56	BlockDriverCompletionFunc cb, void opaque);
	57	void (bdrv_aio_cancel)(BlockDriverAIOCB acb);
	58	int aiocb_size;
	59
	60	const char *protocol_name;
	61	int (bdrv_pread)(BlockDriverState bs, int64_t offset,
	62	uint8_t *buf, int count);
	63	int (bdrv_pwrite)(BlockDriverState bs, int64_t offset,
	64	const uint8_t *buf, int count);
	65	int (bdrv_truncate)(BlockDriverState bs, int64_t offset);
	66	int64_t (bdrv_getlength)(BlockDriverState bs);
	67	int (bdrv_write_compressed)(BlockDriverState bs, int64_t sector_num,
	68	const uint8_t *buf, int nb_sectors);
	69
	70	int (bdrv_snapshot_create)(BlockDriverState bs,
	71	QEMUSnapshotInfo *sn_info);
	72	int (bdrv_snapshot_goto)(BlockDriverState bs,
	73	const char *snapshot_id);
	74	int (bdrv_snapshot_delete)(BlockDriverState bs, const char *snapshot_id);
	75	int (bdrv_snapshot_list)(BlockDriverState bs,
	76	QEMUSnapshotInfo **psn_info);
	77	int (bdrv_get_info)(BlockDriverState bs, BlockDriverInfo *bdi);
	78
	79	/* removable device specific */
	80	int (bdrv_is_inserted)(BlockDriverState bs);
	81	int (bdrv_media_changed)(BlockDriverState bs);
	82	int (bdrv_eject)(BlockDriverState bs, int eject_flag);
	83	int (bdrv_set_locked)(BlockDriverState bs, int locked);
	84
	85	/* to control generic scsi devices */
	86	int (bdrv_ioctl)(BlockDriverState bs, unsigned long int req, void *buf);
	87
	88	BlockDriverAIOCB *free_aiocb;
	89	struct BlockDriver *next;
	90	};
	91
	92	struct BlockDriverState {
	93	int64_t total_sectors; /* if we are reading a disk image, give its
	94	size in sectors */
	95	int read_only; /* if true, the media is read only */
	96	int removable; /* if true, the media can be removed */
	97	int locked; /* if true, the media cannot temporarily be ejected */
	98	int encrypted; /* if true, the media is encrypted */
	99	int valid_key; /* if true, a valid encryption key has been set */
	100	int sg; /* if true, the device is a /dev/sg* */
	101	/* event callback when inserting/removing */
	102	void (change_cb)(void opaque);
	103	void *change_opaque;
	104
	105	BlockDriver drv; / NULL means no media */
	106	void *opaque;
	107
	108	char filename[1024];
	109	char backing_file[1024]; /* if non zero, the image is a diff of
	110	this file image */
	111	int is_temporary;
	112	int media_changed;
	113
	114	BlockDriverState *backing_hd;
	115	/* async read/write emulation */
	116
	117	void *sync_aiocb;
	118
	119	/* I/O stats (display with "info blockstats"). */
	120	uint64_t rd_bytes;
	121	uint64_t wr_bytes;
	122	uint64_t rd_ops;
	123	uint64_t wr_ops;
	124
	125	/* Whether the disk can expand beyond total_sectors */
	126	int growable;
	127
	128	/* NOTE: the following infos are only hints for real hardware
	129	drivers. They are not used by the block driver */
	130	int cyls, heads, secs, translation;
	131	int type;
	132	char device_name[32];
	133	BlockDriverState *next;
	134	void *private;
	135	};
	136
	137	struct BlockDriverAIOCB {
	138	BlockDriverState *bs;
	139	BlockDriverCompletionFunc *cb;
	140	void *opaque;
	141	BlockDriverAIOCB *next;
	142	};
	143
	144	void get_tmp_filename(char *filename, int size);
	145
	146	void qemu_aio_get(BlockDriverState bs, BlockDriverCompletionFunc *cb,
	147	void *opaque);
	148	void qemu_aio_release(void *p);
	149
	150	extern BlockDriverState *bdrv_first;
	151
	152	#endif /* BLOCK_INT_H */