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block: better error message for read only format name 

When user tries to use read-only whitelist format in the command line
option, failure message was "'foo' invalid format". It might be invalid
only for writable, but valid for read-only, so it is confusing. Give the
user easier to understand information.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2013-08-22 15:36:59 +08:00 committed by Stefan Hajnoczi
parent 893a8f6220
commit 7780d47211
1 changed files with 5 additions and 1 deletions
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6
blockdev.c
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@ -487,7 +487,11 @@ static DriveInfo *blockdev_init(QemuOpts *all_opts,
drv = bdrv_find_whitelisted_format(buf, ro); drv = bdrv_find_whitelisted_format(buf, ro);
if (!drv) { if (!drv) {
error_report("'%s' invalid format", buf); if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
error_report("'%s' can be only used as read-only device.", buf);
} else {
error_report("'%s' invalid format", buf);
}
return NULL; return NULL;
} }
} }