mirror of https://github.com/proxmox/mirror_qemu
block: add bdrv_write_zeroes()
Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>master
parent
78f27bd02c
commit
4105eaaab9
27
block.c
27
block.c
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@ -2162,6 +2162,7 @@ typedef struct RwCo {
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QEMUIOVector *qiov;
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QEMUIOVector *qiov;
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bool is_write;
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bool is_write;
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int ret;
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int ret;
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BdrvRequestFlags flags;
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} RwCo;
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} RwCo;
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static void coroutine_fn bdrv_rw_co_entry(void *opaque)
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static void coroutine_fn bdrv_rw_co_entry(void *opaque)
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@ -2170,10 +2171,12 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
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if (!rwco->is_write) {
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if (!rwco->is_write) {
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rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num,
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rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num,
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rwco->nb_sectors, rwco->qiov, 0);
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rwco->nb_sectors, rwco->qiov,
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rwco->flags);
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} else {
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} else {
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rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num,
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rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num,
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rwco->nb_sectors, rwco->qiov, 0);
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rwco->nb_sectors, rwco->qiov,
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rwco->flags);
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}
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}
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}
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}
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@ -2181,7 +2184,8 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
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* Process a vectored synchronous request using coroutines
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* Process a vectored synchronous request using coroutines
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*/
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*/
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static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num,
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static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *qiov, bool is_write)
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QEMUIOVector *qiov, bool is_write,
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BdrvRequestFlags flags)
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{
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{
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Coroutine *co;
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Coroutine *co;
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RwCo rwco = {
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RwCo rwco = {
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@ -2191,6 +2195,7 @@ static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num,
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.qiov = qiov,
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.qiov = qiov,
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.is_write = is_write,
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.is_write = is_write,
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.ret = NOT_DONE,
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.ret = NOT_DONE,
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.flags = flags,
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};
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};
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assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0);
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assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0);
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@ -2222,7 +2227,7 @@ static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num,
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* Process a synchronous request using coroutines
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* Process a synchronous request using coroutines
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*/
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*/
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static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
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static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
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int nb_sectors, bool is_write)
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int nb_sectors, bool is_write, BdrvRequestFlags flags)
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{
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{
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QEMUIOVector qiov;
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QEMUIOVector qiov;
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struct iovec iov = {
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struct iovec iov = {
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@ -2231,14 +2236,14 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
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};
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};
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qemu_iovec_init_external(&qiov, &iov, 1);
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qemu_iovec_init_external(&qiov, &iov, 1);
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return bdrv_rwv_co(bs, sector_num, &qiov, is_write);
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return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags);
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}
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}
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/* return < 0 if error. See bdrv_write() for the return codes */
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/* return < 0 if error. See bdrv_write() for the return codes */
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int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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uint8_t *buf, int nb_sectors)
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{
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{
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return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false);
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return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0);
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}
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}
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/* Just like bdrv_read(), but with I/O throttling temporarily disabled */
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/* Just like bdrv_read(), but with I/O throttling temporarily disabled */
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@ -2264,12 +2269,18 @@ int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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const uint8_t *buf, int nb_sectors)
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{
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{
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return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true);
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return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0);
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}
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}
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int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov)
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int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov)
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{
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{
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return bdrv_rwv_co(bs, sector_num, qiov, true);
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return bdrv_rwv_co(bs, sector_num, qiov, true, 0);
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}
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int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
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{
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return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true,
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BDRV_REQ_ZERO_WRITE);
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}
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}
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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@ -157,6 +157,8 @@ int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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uint8_t *buf, int nb_sectors);
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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const uint8_t *buf, int nb_sectors);
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int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors);
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int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
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int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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void *buf, int count);
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void *buf, int count);
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