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quorum: Implement bdrv_co_pwrite_zeroes()

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This simply calls bdrv_co_pwrite_zeroes() in all children.

bs->supported_zero_flags is also set to the flags that are supported
by all children.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <2f09c842781fe336b4c2e40036bba577b7430190.1605286097.git.berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-11-13 17:52:32 +01:00 committed by Max Reitz
parent ef9bba1484
commit 5cddb2e95f
3 changed files with 53 additions and 2 deletions
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36
block/quorum.c
View file

@ -692,8 +692,13 @@ static void write_quorum_entry(void *opaque)
QuorumChildRequest *sacb = &acb->qcrs[i];
sacb->bs = s->children[i]->bs;
sacb->ret = bdrv_co_pwritev(s->children[i], acb->offset, acb->bytes,
acb->qiov, acb->flags);
if (acb->flags & BDRV_REQ_ZERO_WRITE) {
sacb->ret = bdrv_co_pwrite_zeroes(s->children[i], acb->offset,
acb->bytes, acb->flags);
} else {
sacb->ret = bdrv_co_pwritev(s->children[i], acb->offset, acb->bytes,
acb->qiov, acb->flags);
}
if (sacb->ret == 0) {
acb->success_count++;
} else {
@ -739,6 +744,14 @@ static int quorum_co_pwritev(BlockDriverState *bs, uint64_t offset,
return ret;
}
static int quorum_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
int bytes, BdrvRequestFlags flags)
{
return quorum_co_pwritev(bs, offset, bytes, NULL,
flags | BDRV_REQ_ZERO_WRITE);
}
static int64_t quorum_getlength(BlockDriverState *bs)
{
BDRVQuorumState *s = bs->opaque;
@ -897,6 +910,21 @@ static QemuOptsList quorum_runtime_opts = {
},
};
static void quorum_refresh_flags(BlockDriverState *bs)
{
BDRVQuorumState *s = bs->opaque;
int i;
bs->supported_zero_flags =
BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
for (i = 0; i < s->num_children; i++) {
bs->supported_zero_flags &= s->children[i]->bs->supported_zero_flags;
}
bs->supported_zero_flags |= BDRV_REQ_WRITE_UNCHANGED;
}
static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
@ -991,6 +1019,7 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
s->next_child_index = s->num_children;
bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED;
quorum_refresh_flags(bs);
g_free(opened);
goto exit;
@ -1062,6 +1091,7 @@ static void quorum_add_child(BlockDriverState *bs, BlockDriverState *child_bs,
}
s->children = g_renew(BdrvChild *, s->children, s->num_children + 1);
s->children[s->num_children++] = child;
quorum_refresh_flags(bs);
out:
bdrv_drained_end(bs);
@ -1106,6 +1136,7 @@ static void quorum_del_child(BlockDriverState *bs, BdrvChild *child,
s->children = g_renew(BdrvChild *, s->children, --s->num_children);
bdrv_unref_child(bs, child);
quorum_refresh_flags(bs);
bdrv_drained_end(bs);
}
@ -1256,6 +1287,7 @@ static BlockDriver bdrv_quorum = {
.bdrv_co_preadv = quorum_co_preadv,
.bdrv_co_pwritev = quorum_co_pwritev,
.bdrv_co_pwrite_zeroes = quorum_co_pwrite_zeroes,
.bdrv_add_child = quorum_add_child,
.bdrv_del_child = quorum_del_child,

11
tests/qemu-iotests/312
View file

@ -114,6 +114,17 @@ $QEMU_IO -c "write -P 0 $((0x200000)) $((0x10000))" "$TEST_IMG.0" | _filter_qemu
$QEMU_IO -c "write -z $((0x200000)) $((0x30000))" "$TEST_IMG.1" | _filter_qemu_io
$QEMU_IO -c "write -P 0 $((0x200000)) $((0x20000))" "$TEST_IMG.2" | _filter_qemu_io
# Test 5: write data to a region and then zeroize it, doing it
# directly on the quorum device instead of the individual images.
# This has no effect on the end result but proves that the quorum driver
# supports 'write -z'.
$QEMU_IO -c "open -o $quorum" -c "write -P 1 $((0x250000)) $((0x10000))" | _filter_qemu_io
# Verify the data that we just wrote
$QEMU_IO -c "open -o $quorum" -c "read -P 1 $((0x250000)) $((0x10000))" | _filter_qemu_io
$QEMU_IO -c "open -o $quorum" -c "write -z $((0x250000)) $((0x10000))" | _filter_qemu_io
# Now it should read back as zeroes
$QEMU_IO -c "open -o $quorum" -c "read -P 0 $((0x250000)) $((0x10000))" | _filter_qemu_io
echo
echo '### Launch the drive-mirror job'
echo

8
tests/qemu-iotests/312.out
View file

@ -39,6 +39,14 @@ wrote 196608/196608 bytes at offset 2097152
192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 131072/131072 bytes at offset 2097152
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 2424832
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 2424832
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 2424832
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 2424832
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
### Launch the drive-mirror job