253 lines
7.9 KiB
Diff
253 lines
7.9 KiB
Diff
From 6f6f38d2ef8f22a12f72e4d60f8a1fa978ac569a Mon Sep 17 00:00:00 2001
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From: Wolfgang Bumiller <w.bumiller@proxmox.com>
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Date: Thu, 17 Mar 2016 11:33:37 +0100
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Subject: [PATCH 33/47] block: add the zeroinit block driver filter
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---
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block/Makefile.objs | 1 +
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block/zeroinit.c | 220 ++++++++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 221 insertions(+)
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create mode 100644 block/zeroinit.c
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diff --git a/block/Makefile.objs b/block/Makefile.objs
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index 2593a2f..930ca33 100644
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--- a/block/Makefile.objs
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+++ b/block/Makefile.objs
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@@ -4,6 +4,7 @@ block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
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block-obj-y += qed-check.o
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block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
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block-obj-y += quorum.o
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+block-obj-y += zeroinit.o
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block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
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block-obj-y += block-backend.o snapshot.o qapi.o
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block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o
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diff --git a/block/zeroinit.c b/block/zeroinit.c
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new file mode 100644
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index 0000000..c56a446
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--- /dev/null
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+++ b/block/zeroinit.c
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@@ -0,0 +1,220 @@
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+/*
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+ * Filter to fake a zero-initialized block device.
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+ *
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+ * Copyright (c) 2016 Wolfgang Bumiller <w.bumiller@proxmox.com>
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+ * Copyright (c) 2016 Proxmox Server Solutions GmbH
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+ *
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+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
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+ * See the COPYING file in the top-level directory.
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+ */
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+
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+#include "qemu/osdep.h"
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+#include "qapi/error.h"
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+#include "block/block_int.h"
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+#include "qapi/qmp/qdict.h"
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+#include "qapi/qmp/qstring.h"
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+#include "qemu/cutils.h"
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+
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+typedef struct {
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+ bool has_zero_init;
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+ int64_t extents;
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+} BDRVZeroinitState;
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+
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+/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
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+static void zeroinit_parse_filename(const char *filename, QDict *options,
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+ Error **errp)
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+{
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+ QString *raw_path;
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+
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+ /* Parse the blkverify: prefix */
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+ if (!strstart(filename, "zeroinit:", &filename)) {
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+ /* There was no prefix; therefore, all options have to be already
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+ present in the QDict (except for the filename) */
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+ return;
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+ }
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+
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+ raw_path = qstring_from_str(filename);
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+ qdict_put(options, "x-next", raw_path);
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+}
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+
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+static QemuOptsList runtime_opts = {
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+ .name = "zeroinit",
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+ .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
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+ .desc = {
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+ {
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+ .name = "x-next",
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+ .type = QEMU_OPT_STRING,
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+ .help = "[internal use only, will be removed]",
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+ },
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+ {
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+ .name = "x-zeroinit",
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+ .type = QEMU_OPT_BOOL,
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+ .help = "set has_initialized_zero flag",
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+ },
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+ { /* end of list */ }
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+ },
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+};
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+
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+static int zeroinit_open(BlockDriverState *bs, QDict *options, int flags,
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+ Error **errp)
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+{
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+ BDRVZeroinitState *s = bs->opaque;
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+ QemuOpts *opts;
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+ Error *local_err = NULL;
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+ int ret;
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+
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+ s->extents = 0;
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+
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+ opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
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+ qemu_opts_absorb_qdict(opts, options, &local_err);
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+ if (local_err) {
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+ error_propagate(errp, local_err);
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+ ret = -EINVAL;
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+ goto fail;
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+ }
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+
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+ /* Open the raw file */
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+ bs->file = bdrv_open_child(qemu_opt_get(opts, "x-next"), options, "next",
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+ bs, &child_file, false, &local_err);
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+ if (local_err) {
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+ ret = -EINVAL;
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+ error_propagate(errp, local_err);
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+ goto fail;
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+ }
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+
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+ /* set the options */
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+ s->has_zero_init = qemu_opt_get_bool(opts, "x-zeroinit", true);
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+
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+ ret = 0;
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+fail:
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+ if (ret < 0) {
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+ bdrv_unref_child(bs, bs->file);
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+ }
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+ qemu_opts_del(opts);
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+ return ret;
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+}
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+
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+static void zeroinit_close(BlockDriverState *bs)
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+{
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+ BDRVZeroinitState *s = bs->opaque;
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+ (void)s;
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+}
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+
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+static int64_t zeroinit_getlength(BlockDriverState *bs)
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+{
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+ return bdrv_getlength(bs->file->bs);
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+}
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+
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+static BlockAIOCB *zeroinit_aio_readv(BlockDriverState *bs,
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+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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+ BlockCompletionFunc *cb, void *opaque)
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+{
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+ return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors,
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+ cb, opaque);
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+}
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+
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+static int coroutine_fn zeroinit_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
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+ int count, BdrvRequestFlags flags)
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+{
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+ BDRVZeroinitState *s = bs->opaque;
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+ if (offset >= s->extents)
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+ return 0;
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+ return bdrv_pwrite_zeroes(bs->file, offset, count, flags);
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+}
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+
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+static BlockAIOCB *zeroinit_aio_writev(BlockDriverState *bs,
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+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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+ BlockCompletionFunc *cb, void *opaque)
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+{
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+ BDRVZeroinitState *s = bs->opaque;
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+ int64_t extents = (sector_num << BDRV_SECTOR_BITS) + ((nb_sectors + 1) << BDRV_SECTOR_BITS);
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+ if (extents > s->extents)
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+ s->extents = extents;
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+ return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
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+ cb, opaque);
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+}
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+
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+static BlockAIOCB *zeroinit_aio_flush(BlockDriverState *bs,
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+ BlockCompletionFunc *cb,
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+ void *opaque)
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+{
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+ return bdrv_aio_flush(bs->file->bs, cb, opaque);
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+}
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+
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+static bool zeroinit_recurse_is_first_non_filter(BlockDriverState *bs,
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+ BlockDriverState *candidate)
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+{
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+ return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate);
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+}
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+
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+static coroutine_fn int zeroinit_co_flush(BlockDriverState *bs)
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+{
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+ return bdrv_co_flush(bs->file->bs);
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+}
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+
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+static int zeroinit_has_zero_init(BlockDriverState *bs)
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+{
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+ BDRVZeroinitState *s = bs->opaque;
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+ return s->has_zero_init;
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+}
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+
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+static int64_t coroutine_fn zeroinit_co_get_block_status(BlockDriverState *bs,
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+ int64_t sector_num,
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+ int nb_sectors, int *pnum,
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+ BlockDriverState **file)
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+{
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+ return bdrv_get_block_status(bs->file->bs, sector_num, nb_sectors, pnum, file);
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+}
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+
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+static coroutine_fn BlockAIOCB *zeroinit_aio_pdiscard(BlockDriverState *bs,
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+ int64_t offset, int count,
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+ BlockCompletionFunc *cb, void *opaque)
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+{
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+ return bdrv_aio_pdiscard(bs->file->bs, offset, count, cb, opaque);
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+}
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+
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+static int zeroinit_truncate(BlockDriverState *bs, int64_t offset)
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+{
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+ return bdrv_truncate(bs->file->bs, offset);
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+}
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+
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+static int zeroinit_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
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+{
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+ return bdrv_get_info(bs->file->bs, bdi);
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+}
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+
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+static BlockDriver bdrv_zeroinit = {
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+ .format_name = "zeroinit",
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+ .protocol_name = "zeroinit",
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+ .instance_size = sizeof(BDRVZeroinitState),
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+
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+ .bdrv_parse_filename = zeroinit_parse_filename,
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+ .bdrv_file_open = zeroinit_open,
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+ .bdrv_close = zeroinit_close,
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+ .bdrv_getlength = zeroinit_getlength,
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+ .bdrv_co_flush_to_disk = zeroinit_co_flush,
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+
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+ .bdrv_co_pwrite_zeroes = zeroinit_co_pwrite_zeroes,
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+ .bdrv_aio_writev = zeroinit_aio_writev,
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+ .bdrv_aio_readv = zeroinit_aio_readv,
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+ .bdrv_aio_flush = zeroinit_aio_flush,
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+
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+ .is_filter = true,
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+ .bdrv_recurse_is_first_non_filter = zeroinit_recurse_is_first_non_filter,
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+
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+ .bdrv_has_zero_init = zeroinit_has_zero_init,
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+
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+ .bdrv_co_get_block_status = zeroinit_co_get_block_status,
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+
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+ .bdrv_aio_pdiscard = zeroinit_aio_pdiscard,
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+
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+ .bdrv_truncate = zeroinit_truncate,
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+ .bdrv_get_info = zeroinit_get_info,
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+};
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+
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+static void bdrv_zeroinit_init(void)
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+{
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+ bdrv_register(&bdrv_zeroinit);
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+}
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+
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+block_init(bdrv_zeroinit_init);
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--
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2.1.4
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