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From ddb1e6862dffe40bb2929d3a0e3eba198c54ee43 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 10 Nov 2014 09:14:07 +0100
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Subject: [PATCH 30/41] qcow2: Add falloc and full preallocation option
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Message-id: <1415610847-15383-5-git-send-email-mreitz@redhat.com>
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Patchwork-id: 62240
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O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 4/4] qcow2: Add falloc and full preallocation option
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Bugzilla: 1087724
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Hu Tao <hutao@cn.fujitsu.com>
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preallocation=falloc allocates disk space by posix_fallocate(),
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preallocation=full allocates disk space by writing zeros to disk.
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Both modes imply preallocation=metadata.
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Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 0e4271b711a8ea766d29824c844e268b91ac3ae5)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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block/qcow2.c
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QEMUOptionParameter has not been replaced with QemuOpts downstream,
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total_size is in sectors instead of bytes in downstream's
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qcow2_create2().
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The use of QEMUOptionParameter makes it rather difficult to set an
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option in qcow2 for the underlying file to be created. Because qcow2
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already used to pass a functionally empty options array, I added an
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assertion for this to be true and created a new QEMUOptionParameter
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array in case there are actually options to be passed to the protocol
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driver (that is, for preallocation).
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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block/qcow2.c | 81 +++++++++++++++++++++++++++++++++++++++-------
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qemu-doc.texi | 8 +++--
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qemu-img.texi | 8 +++--
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tests/qemu-iotests/082.out | 54 +++++++++++++++----------------
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4 files changed, 106 insertions(+), 45 deletions(-)
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diff --git a/block/qcow2.c b/block/qcow2.c
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index 99c6b93..43e54d6 100644
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--- a/block/qcow2.c
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+++ b/block/qcow2.c
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@@ -1557,8 +1557,7 @@ static int preallocate(BlockDriverState *bs)
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static int qcow2_create2(const char *filename, int64_t total_size,
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const char *backing_file, const char *backing_format,
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int flags, size_t cluster_size, PreallocMode prealloc,
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- QEMUOptionParameter *options, int version,
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- Error **errp)
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+ int version, Error **errp)
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{
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/* Calculate cluster_bits */
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int cluster_bits;
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@@ -1588,8 +1587,71 @@ static int qcow2_create2(const char *filename, int64_t total_size,
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uint64_t* refcount_table;
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Error *local_err = NULL;
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int ret;
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+ QEMUOptionParameter *options = NULL;
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+ BlockDriver *file_drv;
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+
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+ if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) {
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+ int64_t meta_size = 0;
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+ uint64_t nreftablee, nrefblocke, nl1e, nl2e;
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+ int64_t aligned_total_size = align_offset(total_size * BDRV_SECTOR_SIZE,
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+ cluster_size);
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+
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+ /* header: 1 cluster */
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+ meta_size += cluster_size;
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+
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+ /* total size of L2 tables */
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+ nl2e = aligned_total_size / cluster_size;
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+ nl2e = align_offset(nl2e, cluster_size / sizeof(uint64_t));
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+ meta_size += nl2e * sizeof(uint64_t);
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+
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+ /* total size of L1 tables */
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+ nl1e = nl2e * sizeof(uint64_t) / cluster_size;
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+ nl1e = align_offset(nl1e, cluster_size / sizeof(uint64_t));
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+ meta_size += nl1e * sizeof(uint64_t);
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+
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+ /* total size of refcount blocks
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+ *
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+ * note: every host cluster is reference-counted, including metadata
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+ * (even refcount blocks are recursively included).
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+ * Let:
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+ * a = total_size * BDRV_SECTOR_SIZE (this is the guest disk size)
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+ * m = meta size not including refcount blocks and refcount tables
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+ * c = cluster size
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+ * y1 = number of refcount blocks entries
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+ * y2 = meta size including everything
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+ * then,
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+ * y1 = (y2 + a)/c
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+ * y2 = y1 * sizeof(u16) + y1 * sizeof(u16) * sizeof(u64) / c + m
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+ * we can get y1:
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+ * y1 = (a + m) / (c - sizeof(u16) - sizeof(u16) * sizeof(u64) / c)
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+ */
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+ nrefblocke = (aligned_total_size + meta_size + cluster_size) /
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+ (cluster_size - sizeof(uint16_t) -
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+ 1.0 * sizeof(uint16_t) * sizeof(uint64_t) / cluster_size);
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+ nrefblocke = align_offset(nrefblocke, cluster_size / sizeof(uint16_t));
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+ meta_size += nrefblocke * sizeof(uint16_t);
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+
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+ /* total size of refcount tables */
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+ nreftablee = nrefblocke * sizeof(uint16_t) / cluster_size;
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+ nreftablee = align_offset(nreftablee, cluster_size / sizeof(uint64_t));
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+ meta_size += nreftablee * sizeof(uint64_t);
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+
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+ file_drv = bdrv_find_protocol(filename, true);
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+ if (file_drv == NULL) {
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+ error_setg(errp, "Could not find protocol for file '%s'", filename);
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+ return -ENOENT;
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+ }
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+
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+ options = append_option_parameters(options, file_drv->create_options);
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+
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+ set_option_parameter_int(options, BLOCK_OPT_SIZE,
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+ aligned_total_size + meta_size);
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+ set_option_parameter(options, BLOCK_OPT_PREALLOC,
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+ PreallocMode_lookup[prealloc]);
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+ }
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ret = bdrv_create_file(filename, options, &local_err);
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+ free_option_parameters(options);
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if (ret < 0) {
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error_propagate(errp, local_err);
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return ret;
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@@ -1691,7 +1753,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
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}
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/* And if we're supposed to preallocate metadata, do that now */
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- if (prealloc == PREALLOC_MODE_METADATA) {
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+ if (prealloc != PREALLOC_MODE_OFF) {
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BDRVQcowState *s = bs->opaque;
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qemu_co_mutex_lock(&s->lock);
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ret = preallocate(bs);
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@@ -1761,13 +1823,6 @@ static int qcow2_create(const char *filename, QEMUOptionParameter *options,
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options++;
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}
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- if (prealloc != PREALLOC_MODE_OFF &&
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- prealloc != PREALLOC_MODE_METADATA) {
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- error_setg(errp, "Unsupported preallocate mode: %s",
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- PreallocMode_lookup[prealloc]);
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- return -EINVAL;
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- }
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-
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if (backing_file && prealloc != PREALLOC_MODE_OFF) {
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error_setg(errp, "Backing file and preallocation cannot be used at "
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"the same time");
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@@ -1780,8 +1835,9 @@ static int qcow2_create(const char *filename, QEMUOptionParameter *options,
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return -EINVAL;
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}
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+ assert(!options || !options->name);
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ret = qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
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- cluster_size, prealloc, options, version, &local_err);
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+ cluster_size, prealloc, version, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(errp, local_err);
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}
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@@ -2315,7 +2371,8 @@ static QEMUOptionParameter qcow2_create_options[] = {
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{
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.name = BLOCK_OPT_PREALLOC,
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.type = OPT_STRING,
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- .help = "Preallocation mode (allowed values: off, metadata)"
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+ .help = "Preallocation mode (allowed values: off, metadata, "
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+ "falloc, full)"
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},
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{
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.name = BLOCK_OPT_LAZY_REFCOUNTS,
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diff --git a/qemu-doc.texi b/qemu-doc.texi
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index dc5b49e..0f7e5f8 100644
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--- a/qemu-doc.texi
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+++ b/qemu-doc.texi
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@@ -567,9 +567,11 @@ sizes can improve the image file size whereas larger cluster sizes generally
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provide better performance.
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@item preallocation
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-Preallocation mode (allowed values: off, metadata). An image with preallocated
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-metadata is initially larger but can improve performance when the image needs
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-to grow.
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+Preallocation mode (allowed values: @code{off}, @code{metadata}, @code{falloc},
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+@code{full}). An image with preallocated metadata is initially larger but can
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+improve performance when the image needs to grow. @code{falloc} and @code{full}
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+preallocations are like the same options of @code{raw} format, but sets up
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+metadata also.
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@item lazy_refcounts
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If this option is set to @code{on}, reference count updates are postponed with
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diff --git a/qemu-img.texi b/qemu-img.texi
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index 80d3261..e943856 100644
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--- a/qemu-img.texi
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+++ b/qemu-img.texi
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@@ -432,9 +432,11 @@ sizes can improve the image file size whereas larger cluster sizes generally
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provide better performance.
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@item preallocation
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-Preallocation mode (allowed values: off, metadata). An image with preallocated
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-metadata is initially larger but can improve performance when the image needs
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-to grow.
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+Preallocation mode (allowed values: @code{off}, @code{metadata}, @code{falloc},
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+@code{full}). An image with preallocated metadata is initially larger but can
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+improve performance when the image needs to grow. @code{falloc} and @code{full}
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+preallocations are like the same options of @code{raw} format, but sets up
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+metadata also.
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@item lazy_refcounts
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If this option is set to @code{on}, reference count updates are postponed with
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diff --git a/tests/qemu-iotests/082.out b/tests/qemu-iotests/082.out
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index d71610b..8abfde7 100644
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--- a/tests/qemu-iotests/082.out
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+++ b/tests/qemu-iotests/082.out
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@@ -64,7 +64,7 @@ backing_file File name of a base image
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backing_fmt Image format of the base image
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encryption Encrypt the image
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cluster_size qcow2 cluster size
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-preallocation Preallocation mode (allowed values: off, metadata)
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+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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lazy_refcounts Postpone refcount updates
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Testing: create -f qcow2 -o ? TEST_DIR/t.qcow2 128M
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@@ -75,7 +75,7 @@ backing_file File name of a base image
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backing_fmt Image format of the base image
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encryption Encrypt the image
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cluster_size qcow2 cluster size
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-preallocation Preallocation mode (allowed values: off, metadata)
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+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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lazy_refcounts Postpone refcount updates
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Testing: create -f qcow2 -o cluster_size=4k,help TEST_DIR/t.qcow2 128M
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@@ -86,7 +86,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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cluster_size qcow2 cluster size
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-preallocation Preallocation mode (allowed values: off, metadata)
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+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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lazy_refcounts Postpone refcount updates
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9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o cluster_size=4k,? TEST_DIR/t.qcow2 128M
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@@ -97,7 +97,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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9ae3a8 |
cluster_size qcow2 cluster size
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-preallocation Preallocation mode (allowed values: off, metadata)
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+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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9ae3a8 |
lazy_refcounts Postpone refcount updates
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9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o help,cluster_size=4k TEST_DIR/t.qcow2 128M
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@@ -108,7 +108,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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9ae3a8 |
lazy_refcounts Postpone refcount updates
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9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o ?,cluster_size=4k TEST_DIR/t.qcow2 128M
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9ae3a8 |
@@ -119,7 +119,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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9ae3a8 |
lazy_refcounts Postpone refcount updates
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9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o cluster_size=4k -o help TEST_DIR/t.qcow2 128M
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9ae3a8 |
@@ -130,7 +130,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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9ae3a8 |
lazy_refcounts Postpone refcount updates
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9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o cluster_size=4k -o ? TEST_DIR/t.qcow2 128M
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9ae3a8 |
@@ -141,7 +141,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
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9ae3a8 |
lazy_refcounts Postpone refcount updates
|
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|
9ae3a8 |
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9ae3a8 |
Testing: create -f qcow2 -o backing_file=TEST_DIR/t.qcow2,,help TEST_DIR/t.qcow2 128M
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9ae3a8 |
@@ -167,7 +167,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
|
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
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9ae3a8 |
lazy_refcounts Postpone refcount updates
|
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|
9ae3a8 |
|
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9ae3a8 |
Testing: create -o help
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9ae3a8 |
@@ -245,7 +245,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
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9ae3a8 |
encryption Encrypt the image
|
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9ae3a8 |
cluster_size qcow2 cluster size
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
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|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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9ae3a8 |
Testing: convert -O qcow2 -o ? TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
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9ae3a8 |
@@ -256,7 +256,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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9ae3a8 |
encryption Encrypt the image
|
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9ae3a8 |
cluster_size qcow2 cluster size
|
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9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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|
9ae3a8 |
Testing: convert -O qcow2 -o cluster_size=4k,help TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
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9ae3a8 |
@@ -267,7 +267,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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|
9ae3a8 |
Testing: convert -O qcow2 -o cluster_size=4k,? TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
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9ae3a8 |
@@ -278,7 +278,7 @@ backing_file File name of a base image
|
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9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: convert -O qcow2 -o help,cluster_size=4k TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
|
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9ae3a8 |
@@ -289,7 +289,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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|
9ae3a8 |
Testing: convert -O qcow2 -o ?,cluster_size=4k TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
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9ae3a8 |
@@ -300,7 +300,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
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|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
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|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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|
9ae3a8 |
Testing: convert -O qcow2 -o cluster_size=4k -o help TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
|
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9ae3a8 |
@@ -311,7 +311,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
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|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
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|
9ae3a8 |
Testing: convert -O qcow2 -o cluster_size=4k -o ? TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
|
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9ae3a8 |
@@ -322,7 +322,7 @@ backing_file File name of a base image
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9ae3a8 |
backing_fmt Image format of the base image
|
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|
9ae3a8 |
encryption Encrypt the image
|
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|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: convert -O qcow2 -o backing_file=TEST_DIR/t.qcow2,,help TEST_DIR/t.qcow2 TEST_DIR/t.qcow2.base
|
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|
9ae3a8 |
@@ -348,7 +348,7 @@ backing_file File name of a base image
|
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9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: convert -o help
|
|
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9ae3a8 |
@@ -415,7 +415,7 @@ backing_file File name of a base image
|
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9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o ? TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -426,7 +426,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o cluster_size=4k,help TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -437,7 +437,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o cluster_size=4k,? TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -448,7 +448,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o help,cluster_size=4k TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -459,7 +459,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o ?,cluster_size=4k TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -470,7 +470,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o cluster_size=4k -o help TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -481,7 +481,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o cluster_size=4k -o ? TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -492,7 +492,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: amend -f qcow2 -o backing_file=TEST_DIR/t.qcow2,,help TEST_DIR/t.qcow2
|
|
|
9ae3a8 |
@@ -520,7 +520,7 @@ backing_file File name of a base image
|
|
|
9ae3a8 |
backing_fmt Image format of the base image
|
|
|
9ae3a8 |
encryption Encrypt the image
|
|
|
9ae3a8 |
cluster_size qcow2 cluster size
|
|
|
9ae3a8 |
-preallocation Preallocation mode (allowed values: off, metadata)
|
|
|
9ae3a8 |
+preallocation Preallocation mode (allowed values: off, metadata, falloc, full)
|
|
|
9ae3a8 |
lazy_refcounts Postpone refcount updates
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Testing: convert -o help
|
|
|
9ae3a8 |
--
|
|
|
9ae3a8 |
1.8.3.1
|
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|
9ae3a8 |
|