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qemu-io: add preallocate mode parameter for truncate command 

This will be used in further test.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201021145859.11201-10-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
master
Vladimir Sementsov-Ogievskiy 2020-10-21 17:58:47 +03:00 committed by Max Reitz
parent 33fa2222eb
commit 42ba0225bd
1 changed files with 32 additions and 14 deletions
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46
qemu-io-cmds.c
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@ -1698,13 +1698,42 @@ static const cmdinfo_t flush_cmd = {
.oneline = "flush all in-core file state to disk",
};
static int truncate_f(BlockBackend *blk, int argc, char **argv);
static const cmdinfo_t truncate_cmd = {
.name = "truncate",
.altname = "t",
.cfunc = truncate_f,
.perm = BLK_PERM_WRITE | BLK_PERM_RESIZE,
.argmin = 1,
.argmax = 3,
.args = "[-m prealloc_mode] off",
.oneline = "truncates the current file at the given offset",
};
static int truncate_f(BlockBackend *blk, int argc, char **argv)
{
Error *local_err = NULL;
int64_t offset;
int ret;
int c, ret;
PreallocMode prealloc = PREALLOC_MODE_OFF;
offset = cvtnum(argv[1]);
while ((c = getopt(argc, argv, "m:")) != -1) {
switch (c) {
case 'm':
prealloc = qapi_enum_parse(&PreallocMode_lookup, optarg,
PREALLOC_MODE__MAX, NULL);
if (prealloc == PREALLOC_MODE__MAX) {
error_report("Invalid preallocation mode '%s'", optarg);
return -EINVAL;
}
break;
default:
qemuio_command_usage(&truncate_cmd);
return -EINVAL;
}
}
offset = cvtnum(argv[optind]);
if (offset < 0) {
print_cvtnum_err(offset, argv[1]);
return offset;
@ -1715,7 +1744,7 @@ static int truncate_f(BlockBackend *blk, int argc, char **argv)
* exact=true. It is better to err on the "emit more errors" side
* than to be overly permissive.
*/
ret = blk_truncate(blk, offset, false, PREALLOC_MODE_OFF, 0, &local_err);
ret = blk_truncate(blk, offset, false, prealloc, 0, &local_err);
if (ret < 0) {
error_report_err(local_err);
return ret;
@ -1724,17 +1753,6 @@ static int truncate_f(BlockBackend *blk, int argc, char **argv)
return 0;
}
static const cmdinfo_t truncate_cmd = {
.name = "truncate",
.altname = "t",
.cfunc = truncate_f,
.perm = BLK_PERM_WRITE | BLK_PERM_RESIZE,
.argmin = 1,
.argmax = 1,
.args = "off",
.oneline = "truncates the current file at the given offset",
};
static int length_f(BlockBackend *blk, int argc, char **argv)
{
int64_t size;