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async file I/O API

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2075 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-08-01 16:21:11 +00:00
parent 7954c73498
commit 83f6409109
16 changed files with 1914 additions and 472 deletions
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32
block_int.h
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@ -28,7 +28,7 @@ struct BlockDriver {
const char *format_name;
int instance_size;
int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
int (*bdrv_open)(BlockDriverState *bs, const char *filename);
int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors);
int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
@ -41,11 +41,28 @@ struct BlockDriver {
int nb_sectors, int *pnum);
int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
int (*bdrv_make_empty)(BlockDriverState *bs);
/* aio */
int (*bdrv_aio_new)(BlockDriverAIOCB *acb);
int (*bdrv_aio_read)(BlockDriverAIOCB *acb, int64_t sector_num,
uint8_t *buf, int nb_sectors);
int (*bdrv_aio_write)(BlockDriverAIOCB *acb, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
void (*bdrv_aio_delete)(BlockDriverAIOCB *acb);
const char *protocol_name;
int (*bdrv_pread)(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count);
int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count);
int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
int64_t (*bdrv_getlength)(BlockDriverState *bs);
struct BlockDriver *next;
};
struct BlockDriverState {
int64_t total_sectors;
int64_t total_sectors; /* XXX: will be suppressed */
int read_only; /* if true, the media is read only */
int inserted; /* if true, the media is present */
int removable; /* if true, the media can be removed */
@ -67,6 +84,9 @@ struct BlockDriverState {
int is_temporary;
BlockDriverState *backing_hd;
/* sync read/write emulation */
BlockDriverAIOCB *sync_aiocb;
/* NOTE: the following infos are only hints for real hardware
drivers. They are not used by the block driver */
@ -76,6 +96,14 @@ struct BlockDriverState {
BlockDriverState *next;
};
struct BlockDriverAIOCB {
BlockDriverState *bs;
BlockDriverCompletionFunc *cb;
void *cb_opaque;
void *opaque; /* driver opaque */
};
void get_tmp_filename(char *filename, int size);
#endif /* BLOCK_INT_H */