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block: Convert BB interface to byte-based discards 

Change sector-based blk_discard(), blk_co_discard(), and
blk_aio_discard() to instead be byte-based blk_pdiscard(),
blk_co_pdiscard(), and blk_aio_pdiscard().  NBD gets a lot
simpler now that ignoring the unaligned portion of a
byte-based discard request is handled under the hood by
the block layer.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1468624988-423-6-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eric Blake 2016-07-15 17:22:54 -06:00 committed by Stefan Hajnoczi
parent 60ebac16bc
commit 1c6c4bb7f0
8 changed files with 36 additions and 46 deletions
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25
block/block-backend.c
View File

@ -1065,17 +1065,16 @@ BlockAIOCB *blk_aio_flush(BlockBackend *blk,
return bdrv_aio_flush(blk_bs(blk), cb, opaque);
}
BlockAIOCB *blk_aio_discard(BlockBackend *blk,
int64_t sector_num, int nb_sectors,
BlockCompletionFunc *cb, void *opaque)
BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk,
int64_t offset, int count,
BlockCompletionFunc *cb, void *opaque)
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
int ret = blk_check_byte_request(blk, offset, count);
if (ret < 0) {
return blk_abort_aio_request(blk, cb, opaque, ret);
}
return bdrv_aio_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, cb, opaque);
return bdrv_aio_pdiscard(blk_bs(blk), offset, count, cb, opaque);
}
void blk_aio_cancel(BlockAIOCB *acb)
@ -1107,15 +1106,14 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque);
}
int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count)
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
int ret = blk_check_byte_request(blk, offset, count);
if (ret < 0) {
return ret;
}
return bdrv_co_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS);
return bdrv_co_pdiscard(blk_bs(blk), offset, count);
}
int blk_co_flush(BlockBackend *blk)
@ -1506,15 +1504,14 @@ int blk_truncate(BlockBackend *blk, int64_t offset)
return bdrv_truncate(blk_bs(blk), offset);
}
int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
int blk_pdiscard(BlockBackend *blk, int64_t offset, int count)
{
int ret = blk_check_request(blk, sector_num, nb_sectors);
int ret = blk_check_byte_request(blk, offset, count);
if (ret < 0) {
return ret;
}
return bdrv_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS);
return bdrv_pdiscard(blk_bs(blk), offset, count);
}
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,

5
block/mirror.c
View File

@ -303,8 +303,9 @@ static void mirror_do_zero_or_discard(MirrorBlockJob *s,
s->in_flight++;
s->sectors_in_flight += nb_sectors;
if (is_discard) {
blk_aio_discard(s->target, sector_num, op->nb_sectors,
mirror_write_complete, op);
blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS,
op->nb_sectors << BDRV_SECTOR_BITS,
mirror_write_complete, op);
} else {
blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE,
op->nb_sectors * BDRV_SECTOR_SIZE,

7
hw/block/xen_disk.c
View File

@ -574,9 +574,10 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
{
struct blkif_request_discard *discard_req = (void *)&ioreq->req;
ioreq->aio_inflight++;
blk_aio_discard(blkdev->blk,
discard_req->sector_number, discard_req->nr_sectors,
qemu_aio_complete, ioreq);
blk_aio_pdiscard(blkdev->blk,
discard_req->sector_number << BDRV_SECTOR_BITS,
discard_req->nr_sectors << BDRV_SECTOR_BITS,
qemu_aio_complete, ioreq);
break;
}
default:

6
hw/ide/core.c
View File

@ -423,8 +423,10 @@ static void ide_issue_trim_cb(void *opaque, int ret)
}
/* Got an entry! Submit and exit. */
iocb->aiocb = blk_aio_discard(iocb->blk, sector, count,
ide_issue_trim_cb, opaque);
iocb->aiocb = blk_aio_pdiscard(iocb->blk,
sector << BDRV_SECTOR_BITS,
count << BDRV_SECTOR_BITS,
ide_issue_trim_cb, opaque);
return;
}

8
hw/scsi/scsi-disk.c
View File

@ -1609,10 +1609,10 @@ static void scsi_unmap_complete_noio(UnmapCBData *data, int ret)
goto done;
}
r->req.aiocb = blk_aio_discard(s->qdev.conf.blk,
sector_num * (s->qdev.blocksize / 512),
nb_sectors * (s->qdev.blocksize / 512),
scsi_unmap_complete, data);
r->req.aiocb = blk_aio_pdiscard(s->qdev.conf.blk,
sector_num * s->qdev.blocksize,
nb_sectors * s->qdev.blocksize,
scsi_unmap_complete, data);
data->count--;
data->inbuf += 16;
return;

9
include/sysemu/block-backend.h
View File

@ -139,15 +139,14 @@ BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *blk_aio_flush(BlockBackend *blk,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *blk_aio_discard(BlockBackend *blk,
int64_t sector_num, int nb_sectors,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int count,
BlockCompletionFunc *cb, void *opaque);
void blk_aio_cancel(BlockAIOCB *acb);
void blk_aio_cancel_async(BlockAIOCB *acb);
int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
BlockCompletionFunc *cb, void *opaque);
int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count);
int blk_co_flush(BlockBackend *blk);
int blk_flush(BlockBackend *blk);
int blk_flush_all(void);
@ -207,7 +206,7 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
int blk_truncate(BlockBackend *blk, int64_t offset);
int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
int blk_pdiscard(BlockBackend *blk, int64_t offset, int count);
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
int64_t pos, int size);
int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size);

19
nbd/server.c
View File

@ -1182,20 +1182,11 @@ static void nbd_trip(void *opaque)
break;
case NBD_CMD_TRIM:
TRACE("Request type is TRIM");
/* Ignore unaligned head or tail, until block layer adds byte
* interface */
if (request.len >= BDRV_SECTOR_SIZE) {
request.len -= (request.from + request.len) % BDRV_SECTOR_SIZE;
ret = blk_co_discard(exp->blk,
DIV_ROUND_UP(request.from + exp->dev_offset,
BDRV_SECTOR_SIZE),
request.len / BDRV_SECTOR_SIZE);
if (ret < 0) {
LOG("discard failed");
reply.error = -ret;
}
} else {
TRACE("trim request too small, ignoring");
ret = blk_co_pdiscard(exp->blk, request.from + exp->dev_offset,
request.len);
if (ret < 0) {
LOG("discard failed");
reply.error = -ret;
}
if (nbd_co_send_reply(req, &reply, 0) < 0) {
goto out;

3
qemu-io-cmds.c
View File

@ -1696,8 +1696,7 @@ static int discard_f(BlockBackend *blk, int argc, char **argv)
}
gettimeofday(&t1, NULL);
ret = blk_discard(blk, offset >> BDRV_SECTOR_BITS,
count >> BDRV_SECTOR_BITS);
ret = blk_pdiscard(blk, offset, count);
gettimeofday(&t2, NULL);
if (ret < 0) {