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block: Add strong_runtime_opts to BlockDriver

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This new field can be set by block drivers to list the runtime options
they accept that may influence the contents of the respective BDS. As of
a follow-up patch, this list will be used by the common
bdrv_refresh_filename() implementation to decide which options to put
into BDS.full_open_options (and consequently whether a JSON filename has
to be created), thus freeing the drivers of having to implement that
logic themselves.

Additionally, this patch adds the field to all of the block drivers that
need it and sets it accordingly.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20190201192935.18394-22-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-02-01 20:29:25 +01:00
parent c0625e8092
commit 2654267cc1
23 changed files with 256 additions and 1 deletions
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7
include/block/block_int.h
View file

@ -517,6 +517,13 @@ struct BlockDriver {
void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size);
void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host);
QLIST_ENTRY(BlockDriver) list;
/* Pointer to a NULL-terminated array of names of strong options
* that can be specified for bdrv_open(). A strong option is one
* that changes the data of a BDS.
* If this pointer is NULL, the array is considered empty.
* "filename" and "driver" are always considered strong. */
const char *const *strong_runtime_opts;
};
typedef struct BlockLimits {