235 lines
7.1 KiB
Diff
235 lines
7.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
|
|
Date: Thu, 17 Mar 2016 11:33:37 +0100
|
|
Subject: [PATCH] block: add the zeroinit block driver filter
|
|
|
|
---
|
|
block/Makefile.objs | 1 +
|
|
block/zeroinit.c | 202 ++++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
2 files changed, 203 insertions(+)
|
|
create mode 100644 block/zeroinit.c
|
|
|
|
diff --git a/block/Makefile.objs b/block/Makefile.objs
|
|
index 6eaf78a046..823e60cda6 100644
|
|
--- a/block/Makefile.objs
|
|
+++ b/block/Makefile.objs
|
|
@@ -4,6 +4,7 @@ block-obj-y += qed.o qed-l2-cache.o qed-table.o qed-cluster.o
|
|
block-obj-y += qed-check.o
|
|
block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
|
|
block-obj-y += quorum.o
|
|
+block-obj-y += zeroinit.o
|
|
block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
|
|
block-obj-y += block-backend.o snapshot.o qapi.o
|
|
block-obj-$(CONFIG_WIN32) += file-win32.o win32-aio.o
|
|
diff --git a/block/zeroinit.c b/block/zeroinit.c
|
|
new file mode 100644
|
|
index 0000000000..37f588f75c
|
|
--- /dev/null
|
|
+++ b/block/zeroinit.c
|
|
@@ -0,0 +1,202 @@
|
|
+/*
|
|
+ * Filter to fake a zero-initialized block device.
|
|
+ *
|
|
+ * Copyright (c) 2016 Wolfgang Bumiller <w.bumiller@proxmox.com>
|
|
+ * Copyright (c) 2016 Proxmox Server Solutions GmbH
|
|
+ *
|
|
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
+ * See the COPYING file in the top-level directory.
|
|
+ */
|
|
+
|
|
+#include "qemu/osdep.h"
|
|
+#include "qapi/error.h"
|
|
+#include "block/block_int.h"
|
|
+#include "qapi/qmp/qdict.h"
|
|
+#include "qapi/qmp/qstring.h"
|
|
+#include "qemu/cutils.h"
|
|
+
|
|
+typedef struct {
|
|
+ bool has_zero_init;
|
|
+ int64_t extents;
|
|
+} BDRVZeroinitState;
|
|
+
|
|
+/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
|
|
+static void zeroinit_parse_filename(const char *filename, QDict *options,
|
|
+ Error **errp)
|
|
+{
|
|
+ QString *raw_path;
|
|
+
|
|
+ /* Parse the blkverify: prefix */
|
|
+ if (!strstart(filename, "zeroinit:", &filename)) {
|
|
+ /* There was no prefix; therefore, all options have to be already
|
|
+ present in the QDict (except for the filename) */
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ raw_path = qstring_from_str(filename);
|
|
+ qdict_put(options, "x-next", raw_path);
|
|
+}
|
|
+
|
|
+static QemuOptsList runtime_opts = {
|
|
+ .name = "zeroinit",
|
|
+ .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
+ .desc = {
|
|
+ {
|
|
+ .name = "x-next",
|
|
+ .type = QEMU_OPT_STRING,
|
|
+ .help = "[internal use only, will be removed]",
|
|
+ },
|
|
+ {
|
|
+ .name = "x-zeroinit",
|
|
+ .type = QEMU_OPT_BOOL,
|
|
+ .help = "set has_initialized_zero flag",
|
|
+ },
|
|
+ { /* end of list */ }
|
|
+ },
|
|
+};
|
|
+
|
|
+static int zeroinit_open(BlockDriverState *bs, QDict *options, int flags,
|
|
+ Error **errp)
|
|
+{
|
|
+ BDRVZeroinitState *s = bs->opaque;
|
|
+ QemuOpts *opts;
|
|
+ Error *local_err = NULL;
|
|
+ int ret;
|
|
+
|
|
+ s->extents = 0;
|
|
+
|
|
+ opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
+ qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
+ if (local_err) {
|
|
+ error_propagate(errp, local_err);
|
|
+ ret = -EINVAL;
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
+ /* Open the raw file */
|
|
+ bs->file = bdrv_open_child(qemu_opt_get(opts, "x-next"), options, "next",
|
|
+ bs, &child_file, false, &local_err);
|
|
+ if (local_err) {
|
|
+ ret = -EINVAL;
|
|
+ error_propagate(errp, local_err);
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
+ /* set the options */
|
|
+ s->has_zero_init = qemu_opt_get_bool(opts, "x-zeroinit", true);
|
|
+
|
|
+ ret = 0;
|
|
+fail:
|
|
+ if (ret < 0) {
|
|
+ bdrv_unref_child(bs, bs->file);
|
|
+ }
|
|
+ qemu_opts_del(opts);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void zeroinit_close(BlockDriverState *bs)
|
|
+{
|
|
+ BDRVZeroinitState *s = bs->opaque;
|
|
+ (void)s;
|
|
+}
|
|
+
|
|
+static int64_t zeroinit_getlength(BlockDriverState *bs)
|
|
+{
|
|
+ return bdrv_getlength(bs->file->bs);
|
|
+}
|
|
+
|
|
+static int coroutine_fn zeroinit_co_preadv(BlockDriverState *bs,
|
|
+ uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
|
|
+{
|
|
+ return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
|
|
+}
|
|
+
|
|
+static int coroutine_fn zeroinit_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
|
|
+ int count, BdrvRequestFlags flags)
|
|
+{
|
|
+ BDRVZeroinitState *s = bs->opaque;
|
|
+ if (offset >= s->extents)
|
|
+ return 0;
|
|
+ return bdrv_pwrite_zeroes(bs->file, offset, count, flags);
|
|
+}
|
|
+
|
|
+static int coroutine_fn zeroinit_co_pwritev(BlockDriverState *bs,
|
|
+ uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
|
|
+{
|
|
+ BDRVZeroinitState *s = bs->opaque;
|
|
+ int64_t extents = offset + bytes;
|
|
+ if (extents > s->extents)
|
|
+ s->extents = extents;
|
|
+ return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
|
|
+}
|
|
+
|
|
+static bool zeroinit_recurse_is_first_non_filter(BlockDriverState *bs,
|
|
+ BlockDriverState *candidate)
|
|
+{
|
|
+ return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate);
|
|
+}
|
|
+
|
|
+static coroutine_fn int zeroinit_co_flush(BlockDriverState *bs)
|
|
+{
|
|
+ return bdrv_co_flush(bs->file->bs);
|
|
+}
|
|
+
|
|
+static int zeroinit_has_zero_init(BlockDriverState *bs)
|
|
+{
|
|
+ BDRVZeroinitState *s = bs->opaque;
|
|
+ return s->has_zero_init;
|
|
+}
|
|
+
|
|
+static int coroutine_fn zeroinit_co_pdiscard(BlockDriverState *bs,
|
|
+ int64_t offset, int count)
|
|
+{
|
|
+ return bdrv_co_pdiscard(bs->file->bs, offset, count);
|
|
+}
|
|
+
|
|
+static int zeroinit_truncate(BlockDriverState *bs, int64_t offset,
|
|
+ PreallocMode prealloc, Error **errp)
|
|
+{
|
|
+ return bdrv_truncate(bs->file, offset, prealloc, errp);
|
|
+}
|
|
+
|
|
+static int zeroinit_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
+{
|
|
+ return bdrv_get_info(bs->file->bs, bdi);
|
|
+}
|
|
+
|
|
+static BlockDriver bdrv_zeroinit = {
|
|
+ .format_name = "zeroinit",
|
|
+ .protocol_name = "zeroinit",
|
|
+ .instance_size = sizeof(BDRVZeroinitState),
|
|
+
|
|
+ .bdrv_parse_filename = zeroinit_parse_filename,
|
|
+ .bdrv_file_open = zeroinit_open,
|
|
+ .bdrv_close = zeroinit_close,
|
|
+ .bdrv_getlength = zeroinit_getlength,
|
|
+ .bdrv_child_perm = bdrv_filter_default_perms,
|
|
+ .bdrv_co_flush_to_disk = zeroinit_co_flush,
|
|
+
|
|
+ .bdrv_co_pwrite_zeroes = zeroinit_co_pwrite_zeroes,
|
|
+ .bdrv_co_pwritev = zeroinit_co_pwritev,
|
|
+ .bdrv_co_preadv = zeroinit_co_preadv,
|
|
+ .bdrv_co_flush = zeroinit_co_flush,
|
|
+
|
|
+ .is_filter = true,
|
|
+ .bdrv_recurse_is_first_non_filter = zeroinit_recurse_is_first_non_filter,
|
|
+
|
|
+ .bdrv_has_zero_init = zeroinit_has_zero_init,
|
|
+
|
|
+ .bdrv_co_get_block_status = bdrv_co_get_block_status_from_file,
|
|
+
|
|
+ .bdrv_co_pdiscard = zeroinit_co_pdiscard,
|
|
+
|
|
+ .bdrv_truncate = zeroinit_truncate,
|
|
+ .bdrv_get_info = zeroinit_get_info,
|
|
+};
|
|
+
|
|
+static void bdrv_zeroinit_init(void)
|
|
+{
|
|
+ bdrv_register(&bdrv_zeroinit);
|
|
+}
|
|
+
|
|
+block_init(bdrv_zeroinit_init);
|
|
--
|
|
2.11.0
|
|
|