[Qemu-devel] [PATCH v2 16/19] sheepdog: Switch .bdrv_co_discard() to byte-based

[Eric Blake <eblake@redhat.com>]

Another step towards killing off sector-based block APIs.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/sheepdog.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index e739c56..66e1cb2 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2800,8 +2800,8 @@ static int sd_load_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
 }


-static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
-                                      int nb_sectors)
+static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset,
+                                      int count)
 {
     SheepdogAIOCB *acb;
     BDRVSheepdogState *s = bs->opaque;
@@ -2811,7 +2811,7 @@ static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
     uint32_t zero = 0;

     if (!s->discard_supported) {
-            return 0;
+        return 0;
     }

     memset(&discard_iov, 0, sizeof(discard_iov));
@@ -2820,7 +2820,10 @@ static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
     iov.iov_len = sizeof(zero);
     discard_iov.iov = &iov;
     discard_iov.niov = 1;
-    acb = sd_aio_setup(bs, &discard_iov, sector_num, nb_sectors);
+    assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
+    assert((count & (BDRV_SECTOR_SIZE - 1)) == 0);
+    acb = sd_aio_setup(bs, &discard_iov, offset >> BDRV_SECTOR_BITS,
+                       count >> BDRV_SECTOR_BITS);
     acb->aiocb_type = AIOCB_DISCARD_OBJ;
     acb->aio_done_func = sd_finish_aiocb;

@@ -2954,7 +2957,7 @@ static BlockDriver bdrv_sheepdog = {
     .bdrv_co_readv  = sd_co_readv,
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
-    .bdrv_co_discard = sd_co_discard,
+    .bdrv_co_pdiscard = sd_co_pdiscard,
     .bdrv_co_get_block_status = sd_co_get_block_status,

     .bdrv_snapshot_create   = sd_snapshot_create,
@@ -2990,7 +2993,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
     .bdrv_co_readv  = sd_co_readv,
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
-    .bdrv_co_discard = sd_co_discard,
+    .bdrv_co_pdiscard = sd_co_pdiscard,
     .bdrv_co_get_block_status = sd_co_get_block_status,

     .bdrv_snapshot_create   = sd_snapshot_create,
@@ -3026,7 +3029,7 @@ static BlockDriver bdrv_sheepdog_unix = {
     .bdrv_co_readv  = sd_co_readv,
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
-    .bdrv_co_discard = sd_co_discard,
+    .bdrv_co_pdiscard = sd_co_pdiscard,
     .bdrv_co_get_block_status = sd_co_get_block_status,

     .bdrv_snapshot_create   = sd_snapshot_create,
-- 
2.5.5