/*
* Copyright (C) 2003 Sistina Software
+ * Copyright (C) 2006 Red Hat GmbH
*
* This file is released under the GPL.
*/
#include <linux/sched.h>
#include <linux/slab.h>
-static struct bio_set *_bios;
+struct dm_io_client {
+ mempool_t *pool;
+ struct bio_set *bios;
+};
/* FIXME: can we shrink this ? */
struct io {
unsigned long error;
atomic_t count;
struct task_struct *sleeper;
+ struct dm_io_client *client;
io_notify_fn callback;
void *context;
};
/*
* io contexts are only dynamically allocated for asynchronous
* io. Since async io is likely to be the majority of io we'll
- * have the same number of io contexts as buffer heads ! (FIXME:
- * must reduce this).
+ * have the same number of io contexts as bios! (FIXME: must reduce this).
*/
-static unsigned _num_ios;
-static mempool_t *_io_pool;
static unsigned int pages_to_ios(unsigned int pages)
{
return 4 * pages; /* too many ? */
}
-static int resize_pool(unsigned int new_ios)
+/*
+ * Create a client with mempool and bioset.
+ */
+struct dm_io_client *dm_io_client_create(unsigned num_pages)
{
- 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);
- }
+ unsigned ios = pages_to_ios(num_pages);
+ struct dm_io_client *client;
- } 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, 4);
- if (!_bios) {
- mempool_destroy(_io_pool);
- _io_pool = NULL;
- return -ENOMEM;
- }
- }
+ client = kmalloc(sizeof(*client), GFP_KERNEL);
+ if (!client)
+ return ERR_PTR(-ENOMEM);
+
+ client->pool = mempool_create_kmalloc_pool(ios, sizeof(struct io));
+ if (!client->pool)
+ goto bad;
- if (!r)
- _num_ios = new_ios;
+ client->bios = bioset_create(16, 16);
+ if (!client->bios)
+ goto bad;
- return r;
+ return client;
+
+ bad:
+ if (client->pool)
+ mempool_destroy(client->pool);
+ kfree(client);
+ return ERR_PTR(-ENOMEM);
}
+EXPORT_SYMBOL(dm_io_client_create);
-int dm_io_get(unsigned int num_pages)
+int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client)
{
- return resize_pool(_num_ios + pages_to_ios(num_pages));
+ return mempool_resize(client->pool, pages_to_ios(num_pages),
+ GFP_KERNEL);
}
+EXPORT_SYMBOL(dm_io_client_resize);
-void dm_io_put(unsigned int num_pages)
+void dm_io_client_destroy(struct dm_io_client *client)
{
- resize_pool(_num_ios - pages_to_ios(num_pages));
+ mempool_destroy(client->pool);
+ bioset_free(client->bios);
+ kfree(client);
}
+EXPORT_SYMBOL(dm_io_client_destroy);
/*-----------------------------------------------------------------
* We need to keep track of which region a bio is doing io for.
io_notify_fn fn = io->callback;
void *context = io->context;
- mempool_free(io, _io_pool);
+ mempool_free(io, io->client->pool);
fn(r, context);
}
}
static int endio(struct bio *bio, unsigned int done, int error)
{
- struct io *io = (struct io *) bio->bi_private;
+ struct io *io;
+ unsigned region;
/* keep going until we've finished */
if (bio->bi_size)
if (error && bio_data_dir(bio) == READ)
zero_fill_bio(bio);
- dec_count(io, bio_get_region(bio), error);
+ /*
+ * The bio destructor in bio_put() may use the io object.
+ */
+ io = bio->bi_private;
+ region = bio_get_region(bio);
+
bio->bi_max_vecs++;
bio_put(bio);
+ dec_count(io, region, error);
+
return 0;
}
dp->context_ptr = bvec;
}
+/*
+ * Functions for getting the pages from a VMA.
+ */
static void vm_get_page(struct dpages *dp,
struct page **p, unsigned long *len, unsigned *offset)
{
static void dm_bio_destructor(struct bio *bio)
{
- bio_free(bio, _bios);
+ struct io *io = bio->bi_private;
+
+ bio_free(bio, io->client->bios);
+}
+
+/*
+ * Functions for getting the pages from kernel memory.
+ */
+static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,
+ unsigned *offset)
+{
+ *p = virt_to_page(dp->context_ptr);
+ *offset = dp->context_u;
+ *len = PAGE_SIZE - dp->context_u;
+}
+
+static void km_next_page(struct dpages *dp)
+{
+ dp->context_ptr += PAGE_SIZE - dp->context_u;
+ dp->context_u = 0;
+}
+
+static void km_dp_init(struct dpages *dp, void *data)
+{
+ dp->get_page = km_get_page;
+ dp->next_page = km_next_page;
+ dp->context_u = ((unsigned long) data) & (PAGE_SIZE - 1);
+ dp->context_ptr = data;
}
/*-----------------------------------------------------------------
* to hide it from bio_add_page().
*/
num_bvecs = (remaining / (PAGE_SIZE >> SECTOR_SHIFT)) + 2;
- bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, _bios);
+ 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;
dec_count(io, 0, 0);
}
-static int sync_io(unsigned int num_regions, struct io_region *where,
- int rw, struct dpages *dp, unsigned long *error_bits)
+static int sync_io(struct dm_io_client *client, unsigned int num_regions,
+ struct io_region *where, int rw, struct dpages *dp,
+ unsigned long *error_bits)
{
struct io io;
io.error = 0;
atomic_set(&io.count, 1); /* see dispatch_io() */
io.sleeper = current;
+ io.client = client;
dispatch_io(rw, num_regions, where, dp, &io, 1);
if (atomic_read(&io.count))
return -EINTR;
- *error_bits = io.error;
+ if (error_bits)
+ *error_bits = io.error;
+
return io.error ? -EIO : 0;
}
-static int async_io(unsigned int num_regions, struct io_region *where, int rw,
- struct dpages *dp, io_notify_fn fn, void *context)
+static int async_io(struct dm_io_client *client, unsigned int num_regions,
+ struct io_region *where, int rw, struct dpages *dp,
+ io_notify_fn fn, void *context)
{
struct io *io;
return -EIO;
}
- io = mempool_alloc(_io_pool, GFP_NOIO);
+ io = mempool_alloc(client->pool, GFP_NOIO);
io->error = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
io->sleeper = NULL;
+ io->client = client;
io->callback = fn;
io->context = context;
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)
+static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
{
- struct dpages dp;
- list_dp_init(&dp, pl, offset);
- return sync_io(num_regions, where, rw, &dp, error_bits);
-}
+ /* Set up dpages based on memory type */
+ switch (io_req->mem.type) {
+ case DM_IO_PAGE_LIST:
+ list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);
+ break;
+
+ case DM_IO_BVEC:
+ bvec_dp_init(dp, io_req->mem.ptr.bvec);
+ break;
+
+ case DM_IO_VMA:
+ vm_dp_init(dp, io_req->mem.ptr.vma);
+ break;
+
+ case DM_IO_KMEM:
+ km_dp_init(dp, io_req->mem.ptr.addr);
+ break;
+
+ default:
+ return -EINVAL;
+ }
-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(num_regions, where, rw, &dp, error_bits);
+ return 0;
}
-int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
- void *data, unsigned long *error_bits)
+/*
+ * New collapsed (a)synchronous interface
+ */
+int dm_io(struct dm_io_request *io_req, unsigned num_regions,
+ struct io_region *where, unsigned long *sync_error_bits)
{
+ int r;
struct dpages dp;
- vm_dp_init(&dp, data);
- return sync_io(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(num_regions, where, rw, &dp, fn, context);
-}
+ r = dp_init(io_req, &dp);
+ if (r)
+ return r;
-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(num_regions, where, rw, &dp, fn, context);
-}
+ if (!io_req->notify.fn)
+ return sync_io(io_req->client, num_regions, where,
+ io_req->bi_rw, &dp, sync_error_bits);
-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(num_regions, where, rw, &dp, fn, context);
+ return async_io(io_req->client, num_regions, where, io_req->bi_rw,
+ &dp, io_req->notify.fn, io_req->notify.context);
}
-
-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);
+EXPORT_SYMBOL(dm_io);
projects / linux-flexiantxendom0-3.2.10.git / blobdiff