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qemu-io: Allow reopen read-write 

This allows qemu-iotests to test the switch between read-only and
read-write mode for block devices.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Kevin Wolf 2017-08-03 17:03:00 +02:00
parent fd4520212b
commit ea92203c66
1 changed files with 17 additions and 2 deletions
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19
qemu-io-cmds.c
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@ -1920,6 +1920,7 @@ static void reopen_help(void)
" 'reopen -o lazy-refcounts=on' - activates lazy refcount writeback on a qcow2 image\n"
"\n"
" -r, -- Reopen the image read-only\n"
" -w, -- Reopen the image read-write\n"
" -c, -- Change the cache mode to the given value\n"
" -o, -- Changes block driver options (cf. 'open' command)\n"
"\n");
@ -1942,7 +1943,7 @@ static const cmdinfo_t reopen_cmd = {
.argmin = 0,
.argmax = -1,
.cfunc = reopen_f,
.args = "[-r] [-c cache] [-o options]",
.args = "[(-r|-w)] [-c cache] [-o options]",
.oneline = "reopens an image with new options",
.help = reopen_help,
};
@ -1955,11 +1956,12 @@ static int reopen_f(BlockBackend *blk, int argc, char **argv)
int c;
int flags = bs->open_flags;
bool writethrough = !blk_enable_write_cache(blk);
bool has_rw_option = false;
BlockReopenQueue *brq;
Error *local_err = NULL;
while ((c = getopt(argc, argv, "c:o:r")) != -1) {
while ((c = getopt(argc, argv, "c:o:rw")) != -1) {
switch (c) {
case 'c':
if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) {
@ -1974,7 +1976,20 @@ static int reopen_f(BlockBackend *blk, int argc, char **argv)
}
break;
case 'r':
if (has_rw_option) {
error_report("Only one -r/-w option may be given");
return 0;
}
flags &= ~BDRV_O_RDWR;
has_rw_option = true;
break;
case 'w':
if (has_rw_option) {
error_report("Only one -r/-w option may be given");
return 0;
}
flags |= BDRV_O_RDWR;
has_rw_option = true;
break;
default:
qemu_opts_reset(&reopen_opts);