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[Qemu-devel] [PATCH 02/11] block/io: add bdrv_co_write_compressed
From: |
Denis V. Lunev |
Subject: |
[Qemu-devel] [PATCH 02/11] block/io: add bdrv_co_write_compressed |
Date: |
Tue, 31 May 2016 12:15:21 +0300 |
From: Pavel Butsykin <address@hidden>
This patch just adds the interface to the bdrv_co_pwritev_compressed,
which is currently not used but will be useful for safe implementation of the
bdrv_co_write_compressed callback in format drivers.
Signed-off-by: Pavel Butsykin <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Jeff Cody <address@hidden>
CC: Markus Armbruster <address@hidden>
CC: Eric Blake <address@hidden>
CC: John Snow <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Kevin Wolf <address@hidden>
---
block/io.c | 78 +++++++++++++++++++++++++++++++++++++++++++----
include/block/block_int.h | 5 +++
qemu-img.c | 2 +-
3 files changed, 78 insertions(+), 7 deletions(-)
diff --git a/block/io.c b/block/io.c
index c5bb6ae..54cd9a4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1779,8 +1779,8 @@ int bdrv_is_allocated_above(BlockDriverState *top,
return 0;
}
-int bdrv_pwrite_compressed(BlockDriverState *bs, int64_t offset,
- const void *buf, int count)
+int coroutine_fn bdrv_co_pwritev_compressed(BlockDriverState *bs,
+ int64_t offset, unsigned int bytes, QEMUIOVector *qiov)
{
BlockDriver *drv = bs->drv;
int ret;
@@ -1788,18 +1788,84 @@ int bdrv_pwrite_compressed(BlockDriverState *bs,
int64_t offset,
if (!drv) {
return -ENOMEDIUM;
}
- if (!drv->bdrv_write_compressed) {
+
+ if (!drv->bdrv_co_write_compressed) {
return -ENOTSUP;
}
- ret = bdrv_check_byte_request(bs, offset, count);
+
+ ret = bdrv_check_byte_request(bs, offset, bytes);
if (ret < 0) {
return ret;
}
assert(QLIST_EMPTY(&bs->dirty_bitmaps));
+ assert(qemu_in_coroutine());
+
+ return drv->bdrv_co_write_compressed(bs, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS, qiov);
+}
+
+typedef struct BdrvWriteCompressedCo {
+ BlockDriverState *bs;
+ int64_t offset;
+ QEMUIOVector *qiov;
+ int ret;
+} BdrvWriteCompressedCo;
+
+static void bdrv_write_compressed_co_entry(void *opaque)
+{
+ BdrvWriteCompressedCo *co = opaque;
+
+ co->ret = bdrv_co_pwritev_compressed(co->bs, co->offset, co->qiov->size,
+ co->qiov);
+}
+
+int bdrv_pwrite_compressed(BlockDriverState *bs, int64_t offset,
+ const void *buf, int count)
+{
+ BdrvWriteCompressedCo data;
+ QEMUIOVector qiov;
+ BlockDriver *drv = bs->drv;
+ struct iovec iov = {
+ .iov_base = (void *)buf,
+ .iov_len = count,
+ };
+ qemu_iovec_init_external(&qiov, &iov, 1);
- return drv->bdrv_write_compressed(bs, offset >> BDRV_SECTOR_BITS, buf,
- count >> BDRV_SECTOR_BITS);
+ data = (BdrvWriteCompressedCo) {
+ .bs = bs,
+ .offset = offset,
+ .qiov = &qiov,
+ .ret = -EINPROGRESS,
+ };
+
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+
+ if (drv->bdrv_write_compressed) {
+ int ret = bdrv_check_byte_request(bs, offset, count);
+ if (ret < 0) {
+ return ret;
+ }
+ assert(QLIST_EMPTY(&bs->dirty_bitmaps));
+ return drv->bdrv_write_compressed(bs, offset >> BDRV_SECTOR_BITS, buf,
+ count >> BDRV_SECTOR_BITS);
+ }
+
+ if (qemu_in_coroutine()) {
+ /* Fast-path if already in coroutine context */
+ bdrv_write_compressed_co_entry(&data);
+ } else {
+ AioContext *aio_context = bdrv_get_aio_context(bs);
+
+ Coroutine *co = qemu_coroutine_create(bdrv_write_compressed_co_entry);
+ qemu_coroutine_enter(co, &data);
+ while (data.ret == -EINPROGRESS) {
+ aio_poll(aio_context, true);
+ }
+ }
+ return data.ret;
}
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 30a9717..ccba9c9 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -207,6 +207,9 @@ struct BlockDriver {
int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
+ int coroutine_fn (*bdrv_co_write_compressed)(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
+
int (*bdrv_snapshot_create)(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info);
int (*bdrv_snapshot_goto)(BlockDriverState *bs,
@@ -535,6 +538,8 @@ int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);
+int coroutine_fn bdrv_co_pwritev_compressed(BlockDriverState *bs,
+ int64_t offset, unsigned int bytes, QEMUIOVector *qiov);
int get_tmp_filename(char *filename, int size);
BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
diff --git a/qemu-img.c b/qemu-img.c
index eb744d4..ab54027 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2024,7 +2024,7 @@ static int img_convert(int argc, char **argv)
const char *preallocation =
qemu_opt_get(opts, BLOCK_OPT_PREALLOC);
- if (!drv->bdrv_write_compressed) {
+ if (!drv->bdrv_write_compressed && !drv->bdrv_co_write_compressed) {
error_report("Compression not supported for this file format");
ret = -1;
goto out;
--
2.1.4
- [Qemu-devel] [PATCH v4 00/11] backup compression, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 02/11] block/io: add bdrv_co_write_compressed,
Denis V. Lunev <=
- [Qemu-devel] [PATCH 01/11] block: switch blk_write_compressed() to byte-based interface, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 03/11] qcow2: add qcow2_co_write_compressed, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 04/11] vmdk: add vmdk_co_write_compressed, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 09/11] blockdev-backup: added support for data compression, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 05/11] qcow: add qcow_co_write_compressed, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 07/11] block: optimization blk_pwrite_compressed(), Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 06/11] block: remove BlockDriver.bdrv_write_compressed, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 08/11] drive-backup: added support for data compression, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 10/11] qemu-iotests: test backup compression in 055, Denis V. Lunev, 2016/05/31
- [Qemu-devel] [PATCH 11/11] qemu-iotests: add vmdk for test backup compression in 055, Denis V. Lunev, 2016/05/31