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>

2 files changed, 7 insertions, 175 deletions

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 0c63809ab70e..352c6fbeac53 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -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);
diff --git a/drivers/md/dm-io.h b/drivers/md/dm-io.h
index 05b133825580..f647e2cceaa6 100644
--- a/drivers/md/dm-io.h
+++ b/drivers/md/dm-io.h
@@ -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 {
@@ -63,16 +59,6 @@ struct dm_io_request {
 };
 
 /*
- * 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.
  *
@@ -83,40 +69,9 @@ 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);