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block/coroutines: I/O and "I/O or GS" API

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block coroutines functions run in different aiocontext, and are
not protected by the BQL. Therefore are I/O.

On the other side, generated_co_wrapper functions use BDRV_POLL_WHILE,
meaning the caller can either be the main loop or a specific iothread.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220303151616.325444-25-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-03-03 10:16:09 -05:00 • committed by Kevin Wolf
parent 377cc15bf1
commit 1581a70ddd
5 changed files with 64 additions and 29 deletions
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6
block/block-backend.c
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@ -1290,6 +1290,7 @@ blk_co_do_preadv(BlockBackend *blk, int64_t offset, int64_t bytes,
{
int ret;
BlockDriverState *bs;
IO_CODE();
blk_wait_while_drained(blk);
@ -1337,6 +1338,7 @@ blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes,
{
int ret;
BlockDriverState *bs;
IO_CODE();
blk_wait_while_drained(blk);
@ -1656,6 +1658,8 @@ void blk_aio_cancel_async(BlockAIOCB *acb)
int coroutine_fn
blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
{
IO_CODE();
blk_wait_while_drained(blk);
if (!blk_is_available(blk)) {
@ -1699,6 +1703,7 @@ int coroutine_fn
blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes)
{
int ret;
IO_CODE();
blk_wait_while_drained(blk);
@ -1757,6 +1762,7 @@ int blk_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes)
int coroutine_fn blk_co_do_flush(BlockBackend *blk)
{
blk_wait_while_drained(blk);
IO_CODE();
if (!blk_is_available(blk)) {
return -ENOMEDIUM;