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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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3
block/io.c
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@ -2678,6 +2678,7 @@ bdrv_co_common_block_status_above(BlockDriverState *bs,
BlockDriverState *p;
int64_t eof = 0;
int dummy;
IO_CODE();
assert(!include_base || base); /* Can't include NULL base */
@ -2867,6 +2868,7 @@ bdrv_co_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)
BlockDriver *drv = bs->drv;
BlockDriverState *child_bs = bdrv_primary_bs(bs);
int ret;
IO_CODE();
ret = bdrv_check_qiov_request(pos, qiov->size, qiov, 0, NULL);
if (ret < 0) {
@ -2898,6 +2900,7 @@ bdrv_co_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)
BlockDriver *drv = bs->drv;
BlockDriverState *child_bs = bdrv_primary_bs(bs);
int ret;
IO_CODE();
ret = bdrv_check_qiov_request(pos, qiov->size, qiov, 0, NULL);
if (ret < 0) {