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block: Convert bdrv_aio_discard() to byte-based 

Another step towards byte-based interfaces everywhere.  Replace
the sector-based bdrv_aio_discard() with a new byte-based
bdrv_aio_pdiscard(), which silently ignores any unaligned head
or tail.  Driver callbacks will be converted in followup patches.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 1468624988-423-5-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eric Blake 2016-07-15 17:22:53 -06:00 committed by Stefan Hajnoczi
parent b15404e027
commit 60ebac16bc
4 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
block/block-backend.c
View File

@ -1074,7 +1074,8 @@ BlockAIOCB *blk_aio_discard(BlockBackend *blk,
return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_discard(blk_bs(blk), sector_num, nb_sectors, cb, opaque);
return bdrv_aio_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, cb, opaque);
}
void blk_aio_cancel(BlockAIOCB *acb)

15
block/io.c
View File

@ -2193,7 +2193,7 @@ BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
return &acb->common;
}
static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque)
static void coroutine_fn bdrv_aio_pdiscard_co_entry(void *opaque)
{
BlockAIOCBCoroutine *acb = opaque;
BlockDriverState *bs = acb->common.bs;
@ -2202,21 +2202,20 @@ static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque)
bdrv_co_complete(acb);
}
BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
BlockCompletionFunc *cb, void *opaque)
BlockAIOCB *bdrv_aio_pdiscard(BlockDriverState *bs, int64_t offset, int count,
BlockCompletionFunc *cb, void *opaque)
{
Coroutine *co;
BlockAIOCBCoroutine *acb;
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque);
trace_bdrv_aio_pdiscard(bs, offset, count, opaque);
acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
acb->need_bh = true;
acb->req.error = -EINPROGRESS;
acb->req.offset = sector_num << BDRV_SECTOR_BITS;
acb->req.bytes = nb_sectors << BDRV_SECTOR_BITS;
co = qemu_coroutine_create(bdrv_aio_discard_co_entry, acb);
acb->req.offset = offset;
acb->req.bytes = count;
co = qemu_coroutine_create(bdrv_aio_pdiscard_co_entry, acb);
qemu_coroutine_enter(co);
bdrv_co_maybe_schedule_bh(acb);

2
block/trace-events
View File

@ -9,7 +9,7 @@ blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags
blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags %x"
# block/io.c
bdrv_aio_discard(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
bdrv_aio_pdiscard(void *bs, int64_t offset, int count, void *opaque) "bs %p offset %"PRId64" count %d opaque %p"
bdrv_aio_flush(void *bs, void *opaque) "bs %p opaque %p"
bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"

6
include/block/block.h
View File

@ -316,9 +316,9 @@ BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *bdrv_aio_pdiscard(BlockDriverState *bs,
int64_t offset, int count,
BlockCompletionFunc *cb, void *opaque);
void bdrv_aio_cancel(BlockAIOCB *acb);
void bdrv_aio_cancel_async(BlockAIOCB *acb);