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dm io: remove old interface 

Remove old dm-io interface.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Milan Broz 2007-05-09 02:33:05 -07:00 committed by Linus Torvalds
parent 88be163abb
commit bf17ce3a60
2 changed files with 7 additions and 175 deletions
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131
drivers/md/dm-io.c
View File

@ -13,8 +13,6 @@
#include <linux/sched.h>
#include <linux/slab.h>
static struct bio_set *_bios;
struct dm_io_client {
mempool_t *pool;
struct bio_set *bios;
@ -35,74 +33,12 @@ struct io {
* io. Since async io is likely to be the majority of io we'll
* have the same number of io contexts as bios! (FIXME: must reduce this).
*/
static unsigned _num_ios;
static mempool_t *_io_pool;
/*
* Temporary functions to allow old and new interfaces to co-exist.
*/
static struct bio_set *bios(struct dm_io_client *client)
{
return client ? client->bios : _bios;
}
static mempool_t *io_pool(struct dm_io_client *client)
{
return client ? client->pool : _io_pool;
}
static unsigned int pages_to_ios(unsigned int pages)
{
return 4 * pages; /* too many ? */
}
static int resize_pool(unsigned int new_ios)
{
int r = 0;
if (_io_pool) {
if (new_ios == 0) {
/* free off the pool */
mempool_destroy(_io_pool);
_io_pool = NULL;
bioset_free(_bios);
} else {
/* resize the pool */
r = mempool_resize(_io_pool, new_ios, GFP_KERNEL);
}
} else {
/* create new pool */
_io_pool = mempool_create_kmalloc_pool(new_ios,
sizeof(struct io));
if (!_io_pool)
return -ENOMEM;
_bios = bioset_create(16, 16);
if (!_bios) {
mempool_destroy(_io_pool);
_io_pool = NULL;
return -ENOMEM;
}
}
if (!r)
_num_ios = new_ios;
return r;
}
int dm_io_get(unsigned int num_pages)
{
return resize_pool(_num_ios + pages_to_ios(num_pages));
}
void dm_io_put(unsigned int num_pages)
{
resize_pool(_num_ios - pages_to_ios(num_pages));
}
/*
* Create a client with mempool and bioset.
*/
@ -182,7 +118,7 @@ static void dec_count(struct io *io, unsigned int region, int error)
io_notify_fn fn = io->callback;
void *context = io->context;
mempool_free(io, io_pool(io->client));
mempool_free(io, io->client->pool);
fn(r, context);
}
}
@ -310,7 +246,7 @@ static void dm_bio_destructor(struct bio *bio)
{
struct io *io = bio->bi_private;
bio_free(bio, bios(io->client));
bio_free(bio, io->client->bios);
}
/*
@ -358,7 +294,7 @@ static void do_region(int rw, unsigned int region, struct io_region *where,
* to hide it from bio_add_page().
*/
num_bvecs = (remaining / (PAGE_SIZE >> SECTOR_SHIFT)) + 2;
bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, bios(io->client));
bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios);
bio->bi_sector = where->sector + (where->count - remaining);
bio->bi_bdev = where->bdev;
bio->bi_end_io = endio;
@ -462,7 +398,7 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
return -EIO;
}
io = mempool_alloc(io_pool(client), GFP_NOIO);
io = mempool_alloc(client->pool, GFP_NOIO);
io->error = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
io->sleeper = NULL;
@ -474,56 +410,6 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
return 0;
}
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)
{
struct dpages dp;
list_dp_init(&dp, pl, offset);
return sync_io(NULL, num_regions, where, rw, &dp, 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)
{
struct dpages dp;
bvec_dp_init(&dp, bvec);
return sync_io(NULL, num_regions, where, rw, &dp, error_bits);
}
int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
void *data, unsigned long *error_bits)
{
struct dpages dp;
vm_dp_init(&dp, data);
return sync_io(NULL, num_regions, where, rw, &dp, error_bits);
}
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)
{
struct dpages dp;
list_dp_init(&dp, pl, offset);
return async_io(NULL, num_regions, where, rw, &dp, fn, 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)
{
struct dpages dp;
bvec_dp_init(&dp, bvec);
return async_io(NULL, num_regions, where, rw, &dp, fn, context);
}
int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
void *data, io_notify_fn fn, void *context)
{
struct dpages dp;
vm_dp_init(&dp, data);
return async_io(NULL, num_regions, where, rw, &dp, fn, context);
}
static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
{
/* Set up dpages based on memory type */
@ -572,12 +458,3 @@ int dm_io(struct dm_io_request *io_req, unsigned num_regions,
&dp, io_req->notify.fn, io_req->notify.context);
}
EXPORT_SYMBOL(dm_io);
EXPORT_SYMBOL(dm_io_get);
EXPORT_SYMBOL(dm_io_put);
EXPORT_SYMBOL(dm_io_sync);
EXPORT_SYMBOL(dm_io_async);
EXPORT_SYMBOL(dm_io_sync_bvec);
EXPORT_SYMBOL(dm_io_async_bvec);
EXPORT_SYMBOL(dm_io_sync_vm);
EXPORT_SYMBOL(dm_io_async_vm);

51
drivers/md/dm-io.h
View File

@ -12,7 +12,7 @@
struct io_region {
struct block_device *bdev;
sector_t sector;
sector_t count;
sector_t count; /* If this is zero the region is ignored. */
};
struct page_list {
@ -20,10 +20,6 @@ struct page_list {
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);
enum dm_io_mem_type {
@ -62,16 +58,6 @@ struct dm_io_request {
struct dm_io_client *client; /* Client memory handler */
};
/*
* 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);
/*
* For async io calls, users can alternatively use the dm_io() function below
* and dm_io_client_create() to create private mempools for the client.
@ -82,41 +68,10 @@ struct dm_io_client *dm_io_client_create(unsigned num_pages);
int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client);
void dm_io_client_destroy(struct dm_io_client *client);
/*
* 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);
/*
* IO interface using private per-client pools.
* Each bit in the optional 'sync_error_bits' bitset indicates whether an
* error occurred doing io to the corresponding region.
*/
int dm_io(struct dm_io_request *io_req, unsigned num_regions,
struct io_region *region, unsigned long *sync_error_bits);