+++ /dev/null
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Wolfgang Bumiller <w.bumiller@proxmox.com>
-Date: Mon, 6 Apr 2020 12:16:47 +0200
-Subject: [PATCH] PVE: block: add the zeroinit block driver filter
-
-Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
-[adapt to changed function signatures]
-Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
----
- block/meson.build | 1 +
- block/zeroinit.c | 196 ++++++++++++++++++++++++++++++++++++++++++++++
- 2 files changed, 197 insertions(+)
- create mode 100644 block/zeroinit.c
-
-diff --git a/block/meson.build b/block/meson.build
-index 0b2a60c99b..9451fc3ccd 100644
---- a/block/meson.build
-+++ b/block/meson.build
-@@ -43,6 +43,7 @@ block_ss.add(files(
- 'vmdk.c',
- 'vpc.c',
- 'write-threshold.c',
-+ 'zeroinit.c',
- ), zstd, zlib, gnutls)
-
- softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c'))
-diff --git a/block/zeroinit.c b/block/zeroinit.c
-new file mode 100644
-index 0000000000..20ee611f22
---- /dev/null
-+++ b/block/zeroinit.c
-@@ -0,0 +1,196 @@
-+/*
-+ * 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"
-+#include "qemu/option.h"
-+#include "qemu/module.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_of_bds, BDRV_CHILD_FILTERED, 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,
-+ int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags)
-+{
-+ return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
-+}
-+
-+static int coroutine_fn zeroinit_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
-+ int64_t bytes, BdrvRequestFlags flags)
-+{
-+ BDRVZeroinitState *s = bs->opaque;
-+ if (offset >= s->extents)
-+ return 0;
-+ return bdrv_pwrite_zeroes(bs->file, offset, bytes, flags);
-+}
-+
-+static int coroutine_fn zeroinit_co_pwritev(BlockDriverState *bs,
-+ int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags 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 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, int64_t bytes)
-+{
-+ return bdrv_co_pdiscard(bs->file, offset, bytes);
-+}
-+
-+static int zeroinit_co_truncate(BlockDriverState *bs, int64_t offset,
-+ _Bool exact, PreallocMode prealloc,
-+ BdrvRequestFlags req_flags, Error **errp)
-+{
-+ return bdrv_co_truncate(bs->file, offset, exact, prealloc, req_flags, 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_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_has_zero_init = zeroinit_has_zero_init,
-+
-+ .bdrv_co_pdiscard = zeroinit_co_pdiscard,
-+
-+ .bdrv_co_truncate = zeroinit_co_truncate,
-+ .bdrv_get_info = zeroinit_get_info,
-+};
-+
-+static void bdrv_zeroinit_init(void)
-+{
-+ bdrv_register(&bdrv_zeroinit);
-+}
-+
-+block_init(bdrv_zeroinit_init);
projects / pve-qemu.git / blobdiff