dm snapshot: use dm-bufio

Use dm-bufio for initial loading of the exceptions.
Introduce a new function dm_bufio_forget that frees the given buffer.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

4 files changed, 62 insertions, 7 deletions

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 7441344bd214..39b540a13369 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -238,6 +238,7 @@ config DM_CRYPT
 config DM_SNAPSHOT
        tristate "Snapshot target"
        depends on BLK_DEV_DM
+       select DM_BUFIO
        ---help---
          Allow volume managers to take writable snapshots of a device.
 
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 54bdd923316f..d86593721915 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1350,6 +1350,28 @@ retry:
 }
 EXPORT_SYMBOL_GPL(dm_bufio_release_move);
 
+/*
+ * Free the given buffer.
+ *
+ * This is just a hint, if the buffer is in use or dirty, this function
+ * does nothing.
+ */
+void dm_bufio_forget(struct dm_bufio_client *c, sector_t block)
+{
+        struct dm_buffer *b;
+
+        dm_bufio_lock(c);
+
+        b = __find(c, block);
+        if (b && likely(!b->hold_count) && likely(!b->state)) {
+                __unlink_buffer(b);
+                __free_buffer_wake(b);
+        }
+
+        dm_bufio_unlock(c);
+}
+EXPORT_SYMBOL(dm_bufio_forget);
+
 unsigned dm_bufio_get_block_size(struct dm_bufio_client *c)
 {
         return c->block_size;
diff --git a/drivers/md/dm-bufio.h b/drivers/md/dm-bufio.h
index b142946a9e32..3dac37627ba4 100644
--- a/drivers/md/dm-bufio.h
+++ b/drivers/md/dm-bufio.h
@@ -108,6 +108,13 @@ int dm_bufio_issue_flush(struct dm_bufio_client *c);
  */
 void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block);
 
+/*
+ * Free the given buffer.
+ * This is just a hint, if the buffer is in use or dirty, this function
+ * does nothing.
+ */
+void dm_bufio_forget(struct dm_bufio_client *c, sector_t block);
+
 unsigned dm_bufio_get_block_size(struct dm_bufio_client *c);
 sector_t dm_bufio_get_device_size(struct dm_bufio_client *c);
 sector_t dm_bufio_get_block_number(struct dm_buffer *b);
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index ba792ae068b7..169275050c0b 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -13,6 +13,7 @@
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/dm-io.h>
+#include "dm-bufio.h"
 
 #define DM_MSG_PREFIX "persistent snapshot"
 #define DM_CHUNK_SIZE_DEFAULT_SECTORS 32        /* 16KB */
@@ -495,27 +496,51 @@ static int read_exceptions(struct pstore *ps,
                            void *callback_context)
 {
         int r, full = 1;
+        struct dm_bufio_client *client;
+
+        client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev,
+                                        ps->store->chunk_size << SECTOR_SHIFT,
+                                        1, 0, NULL, NULL);
+
+        if (IS_ERR(client))
+                return PTR_ERR(client);
 
         /*
          * Keeping reading chunks and inserting exceptions until
          * we find a partially full area.
          */
         for (ps->current_area = 0; full; ps->current_area++) {
-                r = area_io(ps, READ);
-                if (r)
-                        return r;
+                struct dm_buffer *bp;
+                void *area;
+                chunk_t chunk = area_location(ps, ps->current_area);
+
+                area = dm_bufio_read(client, chunk, &bp);
+                if (unlikely(IS_ERR(area))) {
+                        r = PTR_ERR(area);
+                        goto ret_destroy_bufio;
+                }
 
-                r = insert_exceptions(ps, ps->area, callback, callback_context,
+                r = insert_exceptions(ps, area, callback, callback_context,
                                       &full);
-                if (r)
-                        return r;
+
+                dm_bufio_release(bp);
+
+                dm_bufio_forget(client, chunk);
+
+                if (unlikely(r))
+                        goto ret_destroy_bufio;
         }
 
         ps->current_area--;
 
         skip_metadata(ps);
 
-        return 0;
+        r = 0;
+
+ret_destroy_bufio:
+        dm_bufio_client_destroy(client);
+
+        return r;
 }
 
 static struct pstore *get_info(struct dm_exception_store *store)