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block: Image file option amendment

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This patch adds the "amend" option to qemu-img which allows changing
image options on existing image files. It also adds the generic bdrv
implementation which is basically just a wrapper for the image format
specific function.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-09-03 10:09:50 +02:00 • committed by Kevin Wolf
parent 56e023af80
commit 6f176b48f9
6 changed files with 108 additions and 0 deletions
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84
qemu-img.c
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@ -2525,6 +2525,90 @@ out:
return 0;
}
static int img_amend(int argc, char **argv)
{
int c, ret = 0;
char *options = NULL;
QEMUOptionParameter *create_options = NULL, *options_param = NULL;
const char *fmt = NULL, *filename;
bool quiet = false;
BlockDriverState *bs = NULL;
for (;;) {
c = getopt(argc, argv, "hqf:o:");
if (c == -1) {
break;
}
switch (c) {
case 'h':
case '?':
help();
break;
case 'o':
options = optarg;
break;
case 'f':
fmt = optarg;
break;
case 'q':
quiet = true;
break;
}
}
if (optind != argc - 1) {
help();
}
if (!options) {
help();
}
filename = argv[argc - 1];
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
if (!bs) {
error_report("Could not open image '%s'", filename);
ret = -1;
goto out;
}
fmt = bs->drv->format_name;
if (is_help_option(options)) {
ret = print_block_option_help(filename, fmt);
goto out;
}
create_options = append_option_parameters(create_options,
bs->drv->create_options);
options_param = parse_option_parameters(options, create_options,
options_param);
if (options_param == NULL) {
error_report("Invalid options for file format '%s'", fmt);
ret = -1;
goto out;
}
ret = bdrv_amend_options(bs, options_param);
if (ret < 0) {
error_report("Error while amending options: %s", strerror(-ret));
goto out;
}
out:
if (bs) {
bdrv_unref(bs);
}
free_option_parameters(create_options);
free_option_parameters(options_param);
if (ret) {
return 1;
}
return 0;
}
static const img_cmd_t img_cmds[] = {
#define DEF(option, callback, arg_string) \
{ option, callback },