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qemu-io: Add command 'reopen'

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2014-12-08 17:37:28 +01:00
parent ff7cfd7d92
commit 5bbd2e595e
1 changed files with 90 additions and 0 deletions
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90
qemu-io-cmds.c
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@ -1979,6 +1979,95 @@ static const cmdinfo_t map_cmd = {
.oneline = "prints the allocated areas of a file",
};
static void reopen_help(void)
{
printf(
"\n"
" Changes the open options of an already opened image\n"
"\n"
" Example:\n"
" 'reopen -o lazy-refcounts=on' - activates lazy refcount writeback on a qcow2 image\n"
"\n"
" -r, -- Reopen the image read-only\n"
" -c, -- Change the cache mode to the given value\n"
" -o, -- Changes block driver options (cf. 'open' command)\n"
"\n");
}
static int reopen_f(BlockBackend *blk, int argc, char **argv);
static QemuOptsList reopen_opts = {
.name = "reopen",
.merge_lists = true,
.head = QTAILQ_HEAD_INITIALIZER(reopen_opts.head),
.desc = {
/* no elements => accept any params */
{ /* end of list */ }
},
};
static const cmdinfo_t reopen_cmd = {
.name = "reopen",
.argmin = 0,
.argmax = -1,
.cfunc = reopen_f,
.args = "[-r] [-c cache] [-o options]",
.oneline = "reopens an image with new options",
.help = reopen_help,
};
static int reopen_f(BlockBackend *blk, int argc, char **argv)
{
BlockDriverState *bs = blk_bs(blk);
QemuOpts *qopts;
QDict *opts;
int c;
int flags = bs->open_flags;
BlockReopenQueue *brq;
Error *local_err = NULL;
while ((c = getopt(argc, argv, "c:o:r")) != -1) {
switch (c) {
case 'c':
if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
error_report("Invalid cache option: %s", optarg);
return 0;
}
break;
case 'o':
if (!qemu_opts_parse_noisily(&reopen_opts, optarg, 0)) {
qemu_opts_reset(&reopen_opts);
return 0;
}
break;
case 'r':
flags &= ~BDRV_O_RDWR;
break;
default:
qemu_opts_reset(&reopen_opts);
return qemuio_command_usage(&reopen_cmd);
}
}
if (optind != argc) {
qemu_opts_reset(&reopen_opts);
return qemuio_command_usage(&reopen_cmd);
}
qopts = qemu_opts_find(&reopen_opts, NULL);
opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
qemu_opts_reset(&reopen_opts);
brq = bdrv_reopen_queue(NULL, bs, opts, flags);
bdrv_reopen_multiple(brq, &local_err);
if (local_err) {
error_report_err(local_err);
}
return 0;
}
static int break_f(BlockBackend *blk, int argc, char **argv)
{
int ret;
@ -2266,6 +2355,7 @@ static void __attribute((constructor)) init_qemuio_commands(void)
qemuio_add_command(&discard_cmd);
qemuio_add_command(&alloc_cmd);
qemuio_add_command(&map_cmd);
qemuio_add_command(&reopen_cmd);
qemuio_add_command(&break_cmd);
qemuio_add_command(&remove_break_cmd);
qemuio_add_command(&resume_cmd);