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[Qemu-devel] [PATCHv2 05/11] block: add bdrv_write_zeroes()
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv2 05/11] block: add bdrv_write_zeroes() |
Date: |
Thu, 27 Jun 2013 15:11:29 +0200 |
Signed-off-by: Peter Lieven <address@hidden>
---
block.c | 27 +++++++++++++++++++--------
include/block/block.h | 2 ++
2 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/block.c b/block.c
index 8e77d46..08b7325 100644
--- a/block.c
+++ b/block.c
@@ -2163,6 +2163,7 @@ typedef struct RwCo {
QEMUIOVector *qiov;
bool is_write;
int ret;
+ BdrvRequestFlags flags;
} RwCo;
static void coroutine_fn bdrv_rw_co_entry(void *opaque)
@@ -2171,10 +2172,12 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
if (!rwco->is_write) {
rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num,
- rwco->nb_sectors, rwco->qiov, 0);
+ rwco->nb_sectors, rwco->qiov,
+ rwco->flags);
} else {
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num,
- rwco->nb_sectors, rwco->qiov, 0);
+ rwco->nb_sectors, rwco->qiov,
+ rwco->flags);
}
}
@@ -2182,7 +2185,8 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
* Process a vectored synchronous request using coroutines
*/
static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num,
- QEMUIOVector *qiov, bool is_write)
+ QEMUIOVector *qiov, bool is_write,
+ BdrvRequestFlags flags)
{
Coroutine *co;
RwCo rwco = {
@@ -2192,6 +2196,7 @@ static int bdrv_rwv_co(BlockDriverState *bs, int64_t
sector_num,
.qiov = qiov,
.is_write = is_write,
.ret = NOT_DONE,
+ .flags = flags,
};
assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0);
@@ -2223,7 +2228,7 @@ static int bdrv_rwv_co(BlockDriverState *bs, int64_t
sector_num,
* Process a synchronous request using coroutines
*/
static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
- int nb_sectors, bool is_write)
+ int nb_sectors, bool is_write, BdrvRequestFlags flags)
{
QEMUIOVector qiov;
struct iovec iov = {
@@ -2232,14 +2237,14 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t
sector_num, uint8_t *buf,
};
qemu_iovec_init_external(&qiov, &iov, 1);
- return bdrv_rwv_co(bs, sector_num, &qiov, is_write);
+ return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags);
}
/* return < 0 if error. See bdrv_write() for the return codes */
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
- return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false);
+ return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0);
}
/* Just like bdrv_read(), but with I/O throttling temporarily disabled */
@@ -2265,12 +2270,18 @@ int bdrv_read_unthrottled(BlockDriverState *bs, int64_t
sector_num,
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
- return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true);
+ return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0);
}
int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov)
{
- return bdrv_rwv_co(bs, sector_num, qiov, true);
+ return bdrv_rwv_co(bs, sector_num, qiov, true, 0);
+}
+
+int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
+{
+ return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true,
+ BDRV_REQ_ZERO_WRITE);
}
int bdrv_pread(BlockDriverState *bs, int64_t offset,
diff --git a/include/block/block.h b/include/block/block.h
index 2307f67..5a062fa 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -156,6 +156,8 @@ int bdrv_read_unthrottled(BlockDriverState *bs, int64_t
sector_num,
uint8_t *buf, int nb_sectors);
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
+int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
+ int nb_sectors);
int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
int bdrv_pread(BlockDriverState *bs, int64_t offset,
void *buf, int count);
--
1.7.9.5
- [Qemu-devel] [PATCHv2 00/11] iscsi/qemu-img/block-migration enhancements, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 03/11] iscsi: add bdrv_co_is_allocated, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 02/11] iscsi: read unmap info from block limits vpd page, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 05/11] block: add bdrv_write_zeroes(),
Peter Lieven <=
- [Qemu-devel] [PATCHv2 01/11] iscsi: add logical block provisioning information to iscsilun, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 06/11] block/raw: add bdrv_co_write_zeroes, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 09/11] iscsi: factor out sector conversions, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 07/11] iscsi: let bdrv_create conditionally zero out the device, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 10/11] iscsi: ignore aio_discard if unsupported, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 04/11] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 11/11] iscsi: assert that sectors are aligned to LUN blocksize, Peter Lieven, 2013/06/27
- [Qemu-devel] [PATCHv2 08/11] block-migration: efficiently encode zero blocks, Peter Lieven, 2013/06/27