Commit b2ce210e authored by Alasdair G. Kergon's avatar Alasdair G. Kergon Committed by Linus Torvalds

[PATCH] dm-io: device-mapper i/o library for kcopyd

Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 78d601f9
...@@ -3,7 +3,7 @@ ...@@ -3,7 +3,7 @@
# #
dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \ dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
dm-ioctl.o dm-ioctl.o dm-io.o
raid6-objs := raid6main.o raid6algos.o raid6recov.o raid6tables.o \ raid6-objs := raid6main.o raid6algos.o raid6recov.o raid6tables.o \
raid6int1.o raid6int2.o raid6int4.o \ raid6int1.o raid6int2.o raid6int4.o \
raid6int8.o raid6int16.o raid6int32.o \ raid6int8.o raid6int16.o raid6int32.o \
......
This diff is collapsed.
/*
* 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
...@@ -89,11 +89,6 @@ mempool_t * mempool_create(int min_nr, mempool_alloc_t *alloc_fn, ...@@ -89,11 +89,6 @@ mempool_t * mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
} }
EXPORT_SYMBOL(mempool_create); EXPORT_SYMBOL(mempool_create);
/*
* mempool_resize is disabled for now, because it has no callers. Feel free
* to turn it back on if needed.
*/
#if 0
/** /**
* mempool_resize - resize an existing memory pool * mempool_resize - resize an existing memory pool
* @pool: pointer to the memory pool which was allocated via * @pool: pointer to the memory pool which was allocated via
...@@ -163,7 +158,6 @@ int mempool_resize(mempool_t *pool, int new_min_nr, int gfp_mask) ...@@ -163,7 +158,6 @@ int mempool_resize(mempool_t *pool, int new_min_nr, int gfp_mask)
return 0; return 0;
} }
EXPORT_SYMBOL(mempool_resize); EXPORT_SYMBOL(mempool_resize);
#endif
/** /**
* mempool_destroy - deallocate a memory pool * mempool_destroy - deallocate a memory pool
......
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