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qapi: introduce PreallocMode and new PreallocModes full and falloc.

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This patch prepares for the subsequent patches.

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hu Tao 2014-09-10 17:05:47 +08:00 committed by Kevin Wolf
parent 180e95265e
commit ffeaac9b4e
3 changed files with 36 additions and 11 deletions
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28
block/qcow2.c
View file

@ -30,6 +30,7 @@
#include "qemu/error-report.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qbool.h"
#include "qapi/util.h"
#include "trace.h"
#include "qemu/option_int.h"
@ -1738,7 +1739,7 @@ static int preallocate(BlockDriverState *bs)
static int qcow2_create2(const char *filename, int64_t total_size,
const char *backing_file, const char *backing_format,
int flags, size_t cluster_size, int prealloc,
int flags, size_t cluster_size, PreallocMode prealloc,
QemuOpts *opts, int version,
Error **errp)
{
@ -1876,7 +1877,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
}
/* And if we're supposed to preallocate metadata, do that now */
if (prealloc) {
if (prealloc == PREALLOC_MODE_METADATA) {
BDRVQcowState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = preallocate(bs);
@ -1915,7 +1916,7 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
uint64_t size = 0;
int flags = 0;
size_t cluster_size = DEFAULT_CLUSTER_SIZE;
int prealloc = 0;
PreallocMode prealloc;
int version = 3;
Error *local_err = NULL;
int ret;
@ -1931,12 +1932,11 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
DEFAULT_CLUSTER_SIZE);
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
if (!buf || !strcmp(buf, "off")) {
prealloc = 0;
} else if (!strcmp(buf, "metadata")) {
prealloc = 1;
} else {
error_setg(errp, "Invalid preallocation mode: '%s'", buf);
prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
PREALLOC_MODE_MAX, PREALLOC_MODE_OFF,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto finish;
}
@ -1958,7 +1958,15 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
flags |= BLOCK_FLAG_LAZY_REFCOUNTS;
}
if (backing_file && prealloc) {
if (prealloc != PREALLOC_MODE_OFF &&
prealloc != PREALLOC_MODE_METADATA) {
ret = -EINVAL;
error_setg(errp, "Unsupported preallocate mode: %s",
PreallocMode_lookup[prealloc]);
goto finish;
}
if (backing_file && prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Backing file and preallocation cannot be used at "
"the same time");
ret = -EINVAL;

17
qapi/block-core.json
View file

@ -1708,3 +1708,20 @@
'len' : 'int',
'offset': 'int',
'speed' : 'int' } }
# @PreallocMode
#
# Preallocation mode of QEMU image file
#
# @off: no preallocation
# @metadata: preallocate only for metadata
# @falloc: like @full preallocation but allocate disk space by
# posix_fallocate() rather than writing zeros.
# @full: preallocate all data by writing zeros to device to ensure disk
# space is really available. @full preallocation also sets up
# metadata correctly.
#
# Since 2.2
##
{ 'enum': 'PreallocMode',
'data': [ 'off', 'metadata', 'falloc', 'full' ] }

2
tests/qemu-iotests/049.out
View file

@ -179,7 +179,7 @@ qemu-img create -f qcow2 -o preallocation=metadata TEST_DIR/t.qcow2 64M
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 encryption=off cluster_size=65536 preallocation='metadata' lazy_refcounts=off
qemu-img create -f qcow2 -o preallocation=1234 TEST_DIR/t.qcow2 64M
qemu-img: TEST_DIR/t.qcow2: Invalid preallocation mode: '1234'
qemu-img: TEST_DIR/t.qcow2: invalid parameter value: 1234
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 encryption=off cluster_size=65536 preallocation='1234' lazy_refcounts=off
== Check encryption option ==