dm io: new interface

Add a new API to dm-io.c that uses a private mempool and bio_set for each
client.

The new functions to use are dm_io_client_create(), dm_io_client_destroy(),
dm_io_client_resize() and dm_io().

Signed-off-by: Heinz Mauelshagen <hjm@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Milan Broz <mbroz@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 173 insertions, 1 deletions

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 66db79208c1d..0c63809ab70e 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -103,6 +103,51 @@ void dm_io_put(unsigned int num_pages)
         resize_pool(_num_ios - pages_to_ios(num_pages));
 }
 
+/*
+ * Create a client with mempool and bioset.
+ */
+struct dm_io_client *dm_io_client_create(unsigned num_pages)
+{
+        unsigned ios = pages_to_ios(num_pages);
+        struct dm_io_client *client;
+
+        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;
+
+        client->bios = bioset_create(16, 16);
+        if (!client->bios)
+                goto bad;
+
+        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_client_resize(unsigned num_pages, struct dm_io_client *client)
+{
+        return mempool_resize(client->pool, pages_to_ios(num_pages),
+                              GFP_KERNEL);
+}
+EXPORT_SYMBOL(dm_io_client_resize);
+
+void dm_io_client_destroy(struct dm_io_client *client)
+{
+        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.
  * In order to save a memory allocation we store this the last
@@ -236,6 +281,9 @@ static void bvec_dp_init(struct dpages *dp, struct bio_vec *bvec)
         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)
 {
@@ -265,6 +313,31 @@ static void dm_bio_destructor(struct bio *bio)
         bio_free(bio, bios(io->client));
 }
 
+/*
+ * 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;
+}
+
 /*-----------------------------------------------------------------
  * IO routines that accept a list of pages.
  *---------------------------------------------------------------*/
@@ -451,6 +524,55 @@ int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
         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 */
+        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;
+        }
+
+        return 0;
+}
+
+/*
+ * 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;
+
+        r = dp_init(io_req, &dp);
+        if (r)
+                return r;
+
+        if (!io_req->notify.fn)
+                return sync_io(io_req->client, num_regions, where,
+                               io_req->bi_rw, &dp, sync_error_bits);
+
+        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);
+
 EXPORT_SYMBOL(dm_io_get);
 EXPORT_SYMBOL(dm_io_put);
 EXPORT_SYMBOL(dm_io_sync);
diff --git a/drivers/md/dm-io.h b/drivers/md/dm-io.h
index f9035bfd1a9f..05b133825580 100644
--- a/drivers/md/dm-io.h
+++ b/drivers/md/dm-io.h
@@ -20,13 +20,47 @@ 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 {
+        DM_IO_PAGE_LIST,/* Page list */
+        DM_IO_BVEC,     /* Bio vector */
+        DM_IO_VMA,      /* Virtual memory area */
+        DM_IO_KMEM,     /* Kernel memory */
+};
+
+struct dm_io_memory {
+        enum dm_io_mem_type type;
+
+        union {
+                struct page_list *pl;
+                struct bio_vec *bvec;
+                void *vma;
+                void *addr;
+        } ptr;
+
+        unsigned offset;
+};
+
+struct dm_io_notify {
+        io_notify_fn fn;        /* Callback for asynchronous requests */
+        void *context;          /* Passed to callback */
+};
+
+/*
+ * IO request structure
+ */
+struct dm_io_client;
+struct dm_io_request {
+        int bi_rw;                      /* READ|WRITE - not READA */
+        struct dm_io_memory mem;        /* Memory to use for io */
+        struct dm_io_notify notify;     /* Synchronous if notify.fn is NULL */
+        struct dm_io_client *client;    /* Client memory handler */
+};
 
 /*
  * Before anyone uses the IO interface they should call
@@ -39,6 +73,16 @@ 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.
+ *
+ * Create/destroy may block.
+ */
+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
@@ -71,4 +115,10 @@ int dm_io_async_bvec(unsigned int num_regions, struct io_region *where, int rw,
 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.
+ */
+int dm_io(struct dm_io_request *io_req, unsigned num_regions,
+          struct io_region *region, unsigned long *sync_error_bits);
+
 #endif