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[PATCH v6 1/3] block: introduce compress filter driver
|
From: |
Andrey Shinkevich |
|
Subject: |
[PATCH v6 1/3] block: introduce compress filter driver |
|
Date: |
Mon, 11 Nov 2019 19:04:35 +0300 |
Allow writing all the data compressed through the filter driver.
The written data will be aligned by the cluster size.
Based on the QEMU current implementation, that data can be written to
unallocated clusters only. May be used for a backup job.
Suggested-by: Max Reitz <address@hidden>
Signed-off-by: Andrey Shinkevich <address@hidden>
---
block/Makefile.objs | 1 +
block/filter-compress.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++++
qapi/block-core.json | 10 ++-
3 files changed, 219 insertions(+), 4 deletions(-)
create mode 100644 block/filter-compress.c
diff --git a/block/Makefile.objs b/block/Makefile.objs
index e394fe0..330529b 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -43,6 +43,7 @@ block-obj-y += crypto.o
block-obj-y += aio_task.o
block-obj-y += backup-top.o
+block-obj-y += filter-compress.o
common-obj-y += stream.o
diff --git a/block/filter-compress.c b/block/filter-compress.c
new file mode 100644
index 0000000..a7b0337
--- /dev/null
+++ b/block/filter-compress.c
@@ -0,0 +1,212 @@
+/*
+ * Compress filter block driver
+ *
+ * Copyright (c) 2019 Virtuozzo International GmbH
+ *
+ * Author:
+ * Andrey Shinkevich <address@hidden>
+ * (based on block/copy-on-read.c by Max Reitz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) any later version of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "block/block_int.h"
+#include "qemu/module.h"
+
+
+static int zip_open(BlockDriverState *bs, QDict *options, int flags,
+ Error **errp)
+{
+ bs->backing = bdrv_open_child(NULL, options, "file", bs, &child_file,
false,
+ errp);
+ if (!bs->backing) {
+ return -EINVAL;
+ }
+
+ bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
+ BDRV_REQ_WRITE_COMPRESSED |
+ (BDRV_REQ_FUA & bs->backing->bs->supported_write_flags);
+
+ bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
+ ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
+ bs->backing->bs->supported_zero_flags);
+
+ return 0;
+}
+
+
+#define PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \
+ | BLK_PERM_WRITE \
+ | BLK_PERM_RESIZE)
+#define PERM_UNCHANGED (BLK_PERM_ALL & ~PERM_PASSTHROUGH)
+
+static void zip_child_perm(BlockDriverState *bs, BdrvChild *c,
+ const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared)
+{
+ *nperm = perm & PERM_PASSTHROUGH;
+ *nshared = (shared & PERM_PASSTHROUGH) | PERM_UNCHANGED;
+
+ /*
+ * We must not request write permissions for an inactive node, the child
+ * cannot provide it.
+ */
+ if (!(bs->open_flags & BDRV_O_INACTIVE)) {
+ *nperm |= BLK_PERM_WRITE_UNCHANGED;
+ }
+}
+
+
+static int64_t zip_getlength(BlockDriverState *bs)
+{
+ return bdrv_getlength(bs->backing->bs);
+}
+
+
+static int coroutine_fn zip_co_truncate(BlockDriverState *bs, int64_t offset,
+ bool exact, PreallocMode prealloc,
+ Error **errp)
+{
+ return bdrv_co_truncate(bs->backing, offset, exact, prealloc, errp);
+}
+
+
+static int coroutine_fn zip_co_preadv(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
+{
+ return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
+}
+
+
+static int coroutine_fn zip_co_preadv_part(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov,
+ size_t qiov_offset,
+ int flags)
+{
+ return bdrv_co_preadv_part(bs->backing, offset, bytes, qiov, qiov_offset,
+ flags);
+}
+
+
+static int coroutine_fn zip_co_pwritev(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
+{
+ return bdrv_co_pwritev(bs->backing, offset, bytes, qiov,
+ flags | BDRV_REQ_WRITE_COMPRESSED);
+}
+
+
+static int coroutine_fn zip_co_pwritev_part(BlockDriverState *bs,
+ uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov,
+ size_t qiov_offset, int flags)
+{
+ return bdrv_co_pwritev_part(bs->backing, offset, bytes, qiov, qiov_offset,
+ flags | BDRV_REQ_WRITE_COMPRESSED);
+}
+
+
+static int coroutine_fn zip_co_pwrite_zeroes(BlockDriverState *bs,
+ int64_t offset, int bytes,
+ BdrvRequestFlags flags)
+{
+ return bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags);
+}
+
+
+static int coroutine_fn zip_co_pdiscard(BlockDriverState *bs,
+ int64_t offset, int bytes)
+{
+ return bdrv_co_pdiscard(bs->backing, offset, bytes);
+}
+
+
+static void zip_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ BlockDriverInfo bdi;
+ int ret;
+
+ if (!bs->backing) {
+ return;
+ }
+
+ ret = bdrv_get_info(bs->backing->bs, &bdi);
+ if (ret < 0 || bdi.cluster_size == 0) {
+ return;
+ }
+
+ bs->backing->bs->bl.request_alignment = bdi.cluster_size;
+ bs->backing->bs->bl.max_transfer = bdi.cluster_size;
+}
+
+
+static void zip_eject(BlockDriverState *bs, bool eject_flag)
+{
+ bdrv_eject(bs->backing->bs, eject_flag);
+}
+
+
+static void zip_lock_medium(BlockDriverState *bs, bool locked)
+{
+ bdrv_lock_medium(bs->backing->bs, locked);
+}
+
+
+static bool zip_recurse_is_first_non_filter(BlockDriverState *bs,
+ BlockDriverState *candidate)
+{
+ return bdrv_recurse_is_first_non_filter(bs->backing->bs, candidate);
+}
+
+
+static BlockDriver bdrv_compress = {
+ .format_name = "compress",
+
+ .bdrv_open = zip_open,
+ .bdrv_child_perm = zip_child_perm,
+
+ .bdrv_getlength = zip_getlength,
+ .bdrv_co_truncate = zip_co_truncate,
+
+ .bdrv_co_preadv = zip_co_preadv,
+ .bdrv_co_preadv_part = zip_co_preadv_part,
+ .bdrv_co_pwritev = zip_co_pwritev,
+ .bdrv_co_pwritev_part = zip_co_pwritev_part,
+ .bdrv_co_pwrite_zeroes = zip_co_pwrite_zeroes,
+ .bdrv_co_pdiscard = zip_co_pdiscard,
+ .bdrv_refresh_limits = zip_refresh_limits,
+
+ .bdrv_eject = zip_eject,
+ .bdrv_lock_medium = zip_lock_medium,
+
+ .bdrv_co_block_status = bdrv_co_block_status_from_backing,
+
+ .bdrv_recurse_is_first_non_filter = zip_recurse_is_first_non_filter,
+
+ .has_variable_length = true,
+ .is_filter = true,
+};
+
+static void bdrv_compress_init(void)
+{
+ bdrv_register(&bdrv_compress);
+}
+
+block_init(bdrv_compress_init);
diff --git a/qapi/block-core.json b/qapi/block-core.json
index aa97ee2..33d8cd8 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2884,15 +2884,16 @@
# @copy-on-read: Since 3.0
# @blklogwrites: Since 3.0
# @blkreplay: Since 4.2
+# @compress: Since 4.2
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs',
- 'cloop', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps', 'gluster',
- 'host_cdrom', 'host_device', 'http', 'https', 'iscsi', 'luks',
- 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', 'qcow',
- 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
+ 'cloop', 'copy-on-read', 'compress', 'dmg', 'file', 'ftp', 'ftps',
+ 'gluster', 'host_cdrom', 'host_device', 'http', 'https', 'iscsi',
+ 'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
+ 'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
{ 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
'sheepdog',
'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ]
}
@@ -4045,6 +4046,7 @@
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'copy-on-read':'BlockdevOptionsGenericFormat',
+ 'compress': 'BlockdevOptionsGenericFormat',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',
'ftp': 'BlockdevOptionsCurlFtp',
--
1.8.3.1