mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 01:40:30 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
|
|
* Copyright (C) 2003 Sistina Software
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#ifndef _DM_IO_H
|
|
#define _DM_IO_H
|
|
|
|
#include "dm.h"
|
|
|
|
/* FIXME make this configurable */
|
|
#define DM_MAX_IO_REGIONS 8
|
|
|
|
struct io_region {
|
|
struct block_device *bdev;
|
|
sector_t sector;
|
|
sector_t count;
|
|
};
|
|
|
|
struct page_list {
|
|
struct page_list *next;
|
|
struct page *page;
|
|
};
|
|
|
|
|
|
/*
|
|
* 'error' is a bitset, with each bit indicating whether an error
|
|
* occurred doing io to the corresponding region.
|
|
*/
|
|
typedef void (*io_notify_fn)(unsigned long error, void *context);
|
|
|
|
|
|
/*
|
|
* Before anyone uses the IO interface they should call
|
|
* dm_io_get(), specifying roughly how many pages they are
|
|
* expecting to perform io on concurrently.
|
|
*
|
|
* This function may block.
|
|
*/
|
|
int dm_io_get(unsigned int num_pages);
|
|
void dm_io_put(unsigned int num_pages);
|
|
|
|
/*
|
|
* Synchronous IO.
|
|
*
|
|
* Please ensure that the rw flag in the next two functions is
|
|
* either READ or WRITE, ie. we don't take READA. Any
|
|
* regions with a zero count field will be ignored.
|
|
*/
|
|
int dm_io_sync(unsigned int num_regions, struct io_region *where, int rw,
|
|
struct page_list *pl, unsigned int offset,
|
|
unsigned long *error_bits);
|
|
|
|
int dm_io_sync_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
struct bio_vec *bvec, unsigned long *error_bits);
|
|
|
|
int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
void *data, unsigned long *error_bits);
|
|
|
|
/*
|
|
* Aynchronous IO.
|
|
*
|
|
* The 'where' array may be safely allocated on the stack since
|
|
* the function takes a copy.
|
|
*/
|
|
int dm_io_async(unsigned int num_regions, struct io_region *where, int rw,
|
|
struct page_list *pl, unsigned int offset,
|
|
io_notify_fn fn, void *context);
|
|
|
|
int dm_io_async_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
struct bio_vec *bvec, io_notify_fn fn, void *context);
|
|
|
|
int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
void *data, io_notify_fn fn, void *context);
|
|
|
|
#endif
|