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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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6
block/file-posix.c
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@ -442,6 +442,8 @@ static QemuOptsList raw_runtime_opts = {
},
};
static const char *const mutable_opts[] = { "x-check-cache-dropped", NULL };
static int raw_open_common(BlockDriverState *bs, QDict *options,
int bdrv_flags, int open_flags,
bool device, Error **errp)
@ -2870,6 +2872,7 @@ BlockDriver bdrv_file = {
.bdrv_set_perm = raw_set_perm,
.bdrv_abort_perm_update = raw_abort_perm_update,
.create_opts = &raw_create_opts,
.mutable_opts = mutable_opts,
};
/***********************************************/
@ -3321,6 +3324,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
.mutable_opts = mutable_opts,
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
.bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
@ -3447,6 +3451,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
.mutable_opts = mutable_opts,
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
@ -3580,6 +3585,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
.mutable_opts = mutable_opts,
.bdrv_co_preadv = raw_co_preadv,
.bdrv_co_pwritev = raw_co_pwritev,