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block: Add bdrv_reopen_set_read_only() 

Most callers of bdrv_reopen() only use it to switch a BlockDriverState
between read-only and read-write, so this patch adds a new function
that does just that.

We also want to get rid of the flags parameter in the bdrv_reopen()
API, so this function sets the "read-only" option and passes the
original flags (which will then be updated in bdrv_reopen_prepare()).

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2018-11-12 16:00:33 +02:00 committed by Kevin Wolf
parent 0342567115
commit 6e1000a863
2 changed files with 19 additions and 0 deletions
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17
block.c
View File

@ -3146,6 +3146,23 @@ int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp)
return ret;
}
int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
Error **errp)
{
int ret;
BlockReopenQueue *queue;
QDict *opts = qdict_new();
qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only);
bdrv_subtree_drained_begin(bs);
queue = bdrv_reopen_queue(NULL, bs, opts, bdrv_get_flags(bs));
ret = bdrv_reopen_multiple(bdrv_get_aio_context(bs), queue, errp);
bdrv_subtree_drained_end(bs);
return ret;
}
static BlockReopenQueueEntry *find_parent_in_reopen_queue(BlockReopenQueue *q,
BdrvChild *c)
{

2
include/block/block.h
View File

@ -303,6 +303,8 @@ BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
QDict *options, int flags);
int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp);
int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
Error **errp);
int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
BlockReopenQueue *queue, Error **errp);
void bdrv_reopen_commit(BDRVReopenState *reopen_state);