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block: Add .bdrv_co_pdiscard() driver callback 

There's enough drivers with a sector-based callback that it will
be easier to switch one at a time.  This patch adds a byte-based
callback, and then after all drivers are swapped, we'll drop the
sector-based callback.

[checkpatch doesn't like the space after coroutine_fn in
block_int.h, but it's consistent with the rest of the file]

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1468624988-423-10-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Eric Blake 2016-07-15 17:22:58 -06:00 committed by Stefan Hajnoczi
parent 4da444a0bb
commit 47a5486d59
2 changed files with 7 additions and 2 deletions
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7
block/io.c
View File

@ -2423,7 +2423,8 @@ int coroutine_fn bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset,
return 0;
}
if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_pdiscard) {
if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_co_pdiscard &&
!bs->drv->bdrv_aio_pdiscard) {
return 0;
}
@ -2455,7 +2456,9 @@ int coroutine_fn bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset,
int ret;
int num = MIN(count, max_pdiscard);
if (bs->drv->bdrv_co_discard) {
if (bs->drv->bdrv_co_pdiscard) {
ret = bs->drv->bdrv_co_pdiscard(bs, offset, num);
} else if (bs->drv->bdrv_co_discard) {
ret = bs->drv->bdrv_co_discard(bs, offset >> BDRV_SECTOR_BITS,
num >> BDRV_SECTOR_BITS);
} else {

2
include/block/block_int.h
View File

@ -167,6 +167,8 @@ struct BlockDriver {
int64_t offset, int count, BdrvRequestFlags flags);
int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors);
int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs,
int64_t offset, int count);
int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum,
BlockDriverState **file);