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>
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@ -1065,17 +1065,16 @@ BlockAIOCB *blk_aio_flush(BlockBackend *blk,
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return bdrv_aio_flush(blk_bs(blk), cb, opaque);
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}
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BlockAIOCB *blk_aio_discard(BlockBackend *blk,
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int64_t sector_num, int nb_sectors,
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BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk,
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int64_t offset, int count,
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BlockCompletionFunc *cb, void *opaque)
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{
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int ret = blk_check_request(blk, sector_num, nb_sectors);
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int ret = blk_check_byte_request(blk, offset, count);
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if (ret < 0) {
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return blk_abort_aio_request(blk, cb, opaque, ret);
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}
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return bdrv_aio_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
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nb_sectors << BDRV_SECTOR_BITS, cb, opaque);
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return bdrv_aio_pdiscard(blk_bs(blk), offset, count, cb, opaque);
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}
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void blk_aio_cancel(BlockAIOCB *acb)
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@ -1107,15 +1106,14 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
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return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque);
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}
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int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
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int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count)
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{
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int ret = blk_check_request(blk, sector_num, nb_sectors);
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int ret = blk_check_byte_request(blk, offset, count);
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if (ret < 0) {
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return ret;
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}
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return bdrv_co_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
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nb_sectors << BDRV_SECTOR_BITS);
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return bdrv_co_pdiscard(blk_bs(blk), offset, count);
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}
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int blk_co_flush(BlockBackend *blk)
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@ -1506,15 +1504,14 @@ int blk_truncate(BlockBackend *blk, int64_t offset)
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return bdrv_truncate(blk_bs(blk), offset);
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}
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int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
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int blk_pdiscard(BlockBackend *blk, int64_t offset, int count)
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{
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int ret = blk_check_request(blk, sector_num, nb_sectors);
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int ret = blk_check_byte_request(blk, offset, count);
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if (ret < 0) {
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return ret;
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}
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return bdrv_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
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nb_sectors << BDRV_SECTOR_BITS);
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return bdrv_pdiscard(blk_bs(blk), offset, count);
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}
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int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
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@ -303,7 +303,8 @@ static void mirror_do_zero_or_discard(MirrorBlockJob *s,
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s->in_flight++;
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s->sectors_in_flight += nb_sectors;
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if (is_discard) {
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blk_aio_discard(s->target, sector_num, op->nb_sectors,
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blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS,
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op->nb_sectors << BDRV_SECTOR_BITS,
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mirror_write_complete, op);
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} else {
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blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE,
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@ -574,8 +574,9 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
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{
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struct blkif_request_discard *discard_req = (void *)&ioreq->req;
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ioreq->aio_inflight++;
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blk_aio_discard(blkdev->blk,
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discard_req->sector_number, discard_req->nr_sectors,
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blk_aio_pdiscard(blkdev->blk,
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discard_req->sector_number << BDRV_SECTOR_BITS,
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discard_req->nr_sectors << BDRV_SECTOR_BITS,
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qemu_aio_complete, ioreq);
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break;
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}
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@ -423,7 +423,9 @@ static void ide_issue_trim_cb(void *opaque, int ret)
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}
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/* Got an entry! Submit and exit. */
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iocb->aiocb = blk_aio_discard(iocb->blk, sector, count,
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iocb->aiocb = blk_aio_pdiscard(iocb->blk,
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sector << BDRV_SECTOR_BITS,
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count << BDRV_SECTOR_BITS,
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ide_issue_trim_cb, opaque);
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return;
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}
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@ -1609,9 +1609,9 @@ static void scsi_unmap_complete_noio(UnmapCBData *data, int ret)
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goto done;
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}
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r->req.aiocb = blk_aio_discard(s->qdev.conf.blk,
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sector_num * (s->qdev.blocksize / 512),
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nb_sectors * (s->qdev.blocksize / 512),
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r->req.aiocb = blk_aio_pdiscard(s->qdev.conf.blk,
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sector_num * s->qdev.blocksize,
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nb_sectors * s->qdev.blocksize,
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scsi_unmap_complete, data);
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data->count--;
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data->inbuf += 16;
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@ -139,15 +139,14 @@ BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *blk_aio_flush(BlockBackend *blk,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *blk_aio_discard(BlockBackend *blk,
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int64_t sector_num, int nb_sectors,
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BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int count,
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BlockCompletionFunc *cb, void *opaque);
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void blk_aio_cancel(BlockAIOCB *acb);
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void blk_aio_cancel_async(BlockAIOCB *acb);
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int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
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BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
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BlockCompletionFunc *cb, void *opaque);
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int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
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int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count);
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int blk_co_flush(BlockBackend *blk);
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int blk_flush(BlockBackend *blk);
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int blk_flush_all(void);
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@ -207,7 +206,7 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
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int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int blk_truncate(BlockBackend *blk, int64_t offset);
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int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
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int blk_pdiscard(BlockBackend *blk, int64_t offset, int count);
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int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
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int64_t pos, int size);
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int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size);
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13
nbd/server.c
13
nbd/server.c
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@ -1182,21 +1182,12 @@ static void nbd_trip(void *opaque)
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break;
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case NBD_CMD_TRIM:
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TRACE("Request type is TRIM");
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/* Ignore unaligned head or tail, until block layer adds byte
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* interface */
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if (request.len >= BDRV_SECTOR_SIZE) {
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request.len -= (request.from + request.len) % BDRV_SECTOR_SIZE;
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ret = blk_co_discard(exp->blk,
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DIV_ROUND_UP(request.from + exp->dev_offset,
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BDRV_SECTOR_SIZE),
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request.len / BDRV_SECTOR_SIZE);
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ret = blk_co_pdiscard(exp->blk, request.from + exp->dev_offset,
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request.len);
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if (ret < 0) {
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LOG("discard failed");
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reply.error = -ret;
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}
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} else {
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TRACE("trim request too small, ignoring");
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}
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if (nbd_co_send_reply(req, &reply, 0) < 0) {
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goto out;
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}
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@ -1696,8 +1696,7 @@ static int discard_f(BlockBackend *blk, int argc, char **argv)
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}
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gettimeofday(&t1, NULL);
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ret = blk_discard(blk, offset >> BDRV_SECTOR_BITS,
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count >> BDRV_SECTOR_BITS);
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ret = blk_pdiscard(blk, offset, count);
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gettimeofday(&t2, NULL);
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if (ret < 0) {
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