From 5cddb2e95f8d9e9ee535964df4136b562ce268e1 Mon Sep 17 00:00:00 2001 From: Alberto Garcia Date: Fri, 13 Nov 2020 17:52:32 +0100 Subject: [PATCH] quorum: Implement bdrv_co_pwrite_zeroes() 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 Message-Id: <2f09c842781fe336b4c2e40036bba577b7430190.1605286097.git.berto@igalia.com> Reviewed-by: Max Reitz Signed-off-by: Max Reitz --- block/quorum.c | 36 ++++++++++++++++++++++++++++++++++-- tests/qemu-iotests/312 | 11 +++++++++++ tests/qemu-iotests/312.out | 8 ++++++++ 3 files changed, 53 insertions(+), 2 deletions(-) diff --git a/block/quorum.c b/block/quorum.c index ae62b206c9..0bd75450de 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -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, diff --git a/tests/qemu-iotests/312 b/tests/qemu-iotests/312 index 1b08f1552f..41340494b0 100755 --- a/tests/qemu-iotests/312 +++ b/tests/qemu-iotests/312 @@ -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 diff --git a/tests/qemu-iotests/312.out b/tests/qemu-iotests/312.out index 4ae749175b..cdd5c40e08 100644 --- a/tests/qemu-iotests/312.out +++ b/tests/qemu-iotests/312.out @@ -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