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block: add block driver read only whitelist

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We may want to include a driver in the whitelist for read only tasks
such as diagnosing or exporting guest data (with libguestfs as a good
example). This patch introduces a readonly whitelist option, and for
backward compatibility, the old configure option --block-drv-whitelist
is now an alias to rw whitelist.

Drivers in readonly list is only permitted to open file readonly, and
returns -ENOTSUP for RW opening.

E.g. To include vmdk readonly, and others read+write:
    ./configure --target-list=x86_64-softmmu \
                --block-drv-rw-whitelist=qcow2,raw,file,qed \
                --block-drv-ro-whitelist=vmdk

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2013-05-29 19:35:40 +08:00 • committed by Kevin Wolf
parent 8ddd08c5d1
commit b64ec4e4ad
6 changed files with 61 additions and 28 deletions
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4
blockdev.c
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@ -477,7 +477,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
error_printf("\n");
return NULL;
}
drv = bdrv_find_whitelisted_format(buf);
drv = bdrv_find_whitelisted_format(buf, ro);
if (!drv) {
error_report("'%s' invalid format", buf);
return NULL;
@ -1096,7 +1096,7 @@ void qmp_change_blockdev(const char *device, const char *filename,
}
if (format) {
drv = bdrv_find_whitelisted_format(format);
drv = bdrv_find_whitelisted_format(format, bs->read_only);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;