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block: Add blk_set_allow_aio_context_change()

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Some users (like block jobs) can tolerate an AioContext change for their
BlockBackend. Add a function that tells the BlockBackend that it can
allow changes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-05-06 19:18:02 +02:00
parent 38475269d4
commit 980b0f943a
2 changed files with 11 additions and 0 deletions
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10
block/block-backend.c
View File

@ -71,6 +71,7 @@ struct BlockBackend {
uint64_t shared_perm;
bool disable_perm;
bool allow_aio_context_change;
bool allow_write_beyond_eof;
NotifierList remove_bs_notifiers, insert_bs_notifiers;
@ -1092,6 +1093,11 @@ void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow)
blk->allow_write_beyond_eof = allow;
}
void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow)
{
blk->allow_aio_context_change = allow;
}
static int blk_check_byte_request(BlockBackend *blk, int64_t offset,
size_t size)
{
@ -1891,6 +1897,10 @@ static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx,
{
BlockBackend *blk = child->opaque;
if (blk->allow_aio_context_change) {
return true;
}
/* Only manually created BlockBackends that are not attached to anything
* can change their AioContext without updating their user. */
if (!blk->name || blk->dev) {

1
include/sysemu/block-backend.h
View File

@ -103,6 +103,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm);
void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow);
void blk_iostatus_enable(BlockBackend *blk);
bool blk_iostatus_is_enabled(const BlockBackend *blk);
BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk);