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block: Convert bdrv_write() to BdrvChild 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-05-31 14:42:08 +02:00
parent fbcbbf4e80
commit 18d51c4bac
8 changed files with 100 additions and 12 deletions
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5
block/io.c
View File

@ -642,10 +642,11 @@ int bdrv_read(BdrvChild *child, int64_t sector_num,
-EINVAL Invalid sector number or nb_sectors
-EACCES Trying to write a read-only device
*/
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
int bdrv_write(BdrvChild *child, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0);
return bdrv_rw_co(child->bs, sector_num, (uint8_t *)buf, nb_sectors,
true, 0);
}
int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,

45
block/qcow.c
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@ -913,6 +913,49 @@ static int qcow_make_empty(BlockDriverState *bs)
return 0;
}
typedef struct QcowWriteCo {
BlockDriverState *bs;
int64_t sector_num;
const uint8_t *buf;
int nb_sectors;
int ret;
} QcowWriteCo;
static void qcow_write_co_entry(void *opaque)
{
QcowWriteCo *co = opaque;
QEMUIOVector qiov;
struct iovec iov = (struct iovec) {
.iov_base = (uint8_t*) co->buf,
.iov_len = co->nb_sectors * BDRV_SECTOR_SIZE,
};
qemu_iovec_init_external(&qiov, &iov, 1);
co->ret = qcow_co_writev(co->bs, co->sector_num, co->nb_sectors, &qiov);
}
/* Wrapper for non-coroutine contexts */
static int qcow_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
Coroutine *co;
AioContext *aio_context = bdrv_get_aio_context(bs);
QcowWriteCo data = {
.bs = bs,
.sector_num = sector_num,
.buf = buf,
.nb_sectors = nb_sectors,
.ret = -EINPROGRESS,
};
co = qemu_coroutine_create(qcow_write_co_entry);
qemu_coroutine_enter(co, &data);
while (data.ret == -EINPROGRESS) {
aio_poll(aio_context, true);
}
return data.ret;
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
@ -969,7 +1012,7 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* could not compress: write normal cluster */
ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
ret = qcow_write(bs, sector_num, buf, s->cluster_sectors);
if (ret < 0) {
goto fail;
}

2
block/qcow2-cluster.c
View File

@ -1784,7 +1784,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
goto fail;
}
ret = bdrv_write(bs->file->bs, l2_offset / BDRV_SECTOR_SIZE,
ret = bdrv_write(bs->file, l2_offset / BDRV_SECTOR_SIZE,
(void *)l2_table, s->cluster_sectors);
if (ret < 0) {
goto fail;

2
block/qcow2-refcount.c
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@ -2098,7 +2098,7 @@ write_refblocks:
on_disk_refblock = (void *)((char *) *refcount_table +
refblock_index * s->cluster_size);
ret = bdrv_write(bs->file->bs, refblock_offset / BDRV_SECTOR_SIZE,
ret = bdrv_write(bs->file, refblock_offset / BDRV_SECTOR_SIZE,
on_disk_refblock, s->cluster_sectors);
if (ret < 0) {
fprintf(stderr, "ERROR writing refblock: %s\n", strerror(-ret));

47
block/qcow2.c
View File

@ -2533,6 +2533,51 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
return 0;
}
typedef struct Qcow2WriteCo {
BlockDriverState *bs;
int64_t sector_num;
const uint8_t *buf;
int nb_sectors;
int ret;
} Qcow2WriteCo;
static void qcow2_write_co_entry(void *opaque)
{
Qcow2WriteCo *co = opaque;
QEMUIOVector qiov;
uint64_t offset = co->sector_num * BDRV_SECTOR_SIZE;
uint64_t bytes = co->nb_sectors * BDRV_SECTOR_SIZE;
struct iovec iov = (struct iovec) {
.iov_base = (uint8_t*) co->buf,
.iov_len = bytes,
};
qemu_iovec_init_external(&qiov, &iov, 1);
co->ret = qcow2_co_pwritev(co->bs, offset, bytes, &qiov, 0);
}
/* Wrapper for non-coroutine contexts */
static int qcow2_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
Coroutine *co;
AioContext *aio_context = bdrv_get_aio_context(bs);
Qcow2WriteCo data = {
.bs = bs,
.sector_num = sector_num,
.buf = buf,
.nb_sectors = nb_sectors,
.ret = -EINPROGRESS,
};
co = qemu_coroutine_create(qcow2_write_co_entry);
qemu_coroutine_enter(co, &data);
while (data.ret == -EINPROGRESS) {
aio_poll(aio_context, true);
}
return data.ret;
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
@ -2596,7 +2641,7 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* could not compress: write normal cluster */
ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
ret = qcow2_write(bs, sector_num, buf, s->cluster_sectors);
if (ret < 0) {
goto fail;
}

4
block/vdi.c
View File

@ -719,7 +719,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
assert(VDI_IS_ALLOCATED(bmap_first));
*header = s->header;
vdi_header_to_le(header);
ret = bdrv_write(bs->file->bs, 0, block, 1);
ret = bdrv_write(bs->file, 0, block, 1);
g_free(block);
block = NULL;
@ -737,7 +737,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
logout("will write %u block map sectors starting from entry %u\n",
n_sectors, bmap_first);
ret = bdrv_write(bs->file->bs, offset, base, n_sectors);
ret = bdrv_write(bs->file, offset, base, n_sectors);
}
return ret;

5
block/vvfat.c
View File

@ -1834,8 +1834,7 @@ static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
if (res) {
return -1;
}
res = bdrv_write(s->qcow->bs, offset,
s->cluster_buffer, 1);
res = bdrv_write(s->qcow, offset, s->cluster_buffer, 1);
if (res) {
return -2;
}
@ -2889,7 +2888,7 @@ DLOG(checkpoint());
* Use qcow backend. Commit later.
*/
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
ret = bdrv_write(s->qcow->bs, sector_num, buf, nb_sectors);
ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
if (ret < 0) {
fprintf(stderr, "Error writing to qcow backend\n");
return ret;

2
include/block/block.h
View File

@ -228,7 +228,7 @@ void bdrv_reopen_commit(BDRVReopenState *reopen_state);
void bdrv_reopen_abort(BDRVReopenState *reopen_state);
int bdrv_read(BdrvChild *child, int64_t sector_num,
uint8_t *buf, int nb_sectors);
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
int bdrv_write(BdrvChild *child, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
int count, BdrvRequestFlags flags);