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block: Add a 'mutable_opts' field to BlockDriver

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If we reopen a BlockDriverState and there is an option that is present
in bs->options but missing from the new set of options then we have to
return an error unless the driver is able to reset it to its default
value.

This patch adds a new 'mutable_opts' field to BlockDriver. This is
a list of runtime options that can be modified during reopen. If an
option in this list is unspecified on reopen then it must be reset (or
return an error).

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-03-12 18:48:48 +02:00 • committed by Kevin Wolf
parent cb828c31de
commit 8a2ce0bc1e
4 changed files with 42 additions and 0 deletions
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8
include/block/block_int.h
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@ -383,6 +383,14 @@ struct BlockDriver {
/* List of options for creating images, terminated by name == NULL */
QemuOptsList *create_opts;
/*
* If this driver supports reopening images this contains a
* NULL-terminated list of the runtime options that can be
* modified. If an option in this list is unspecified during
* reopen then it _must_ be reset to its default value or return
* an error.
*/
const char *const *mutable_opts;
/*
* Returns 0 for completed check, -errno for internal errors.