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block: Convert bdrv_lock_medium() to co_wrapper

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bdrv_lock_medium() is categorized as an I/O function, and it currently
doesn't run in a coroutine. We should let it take a graph rdlock since
it traverses the block nodes graph, which however is only possible in a
coroutine.

The only caller of this function is blk_lock_medium(). Therefore make
blk_lock_medium() a co_wrapper, so that it always creates a new
coroutine, and then make bdrv_lock_medium() a coroutine_fn where the
lock can be taken.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230113204212.359076-13-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2023-01-13 21:42:10 +01:00 • committed by Kevin Wolf
parent 2531b390fb
commit 2c75261cc2
9 changed files with 24 additions and 21 deletions
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8
block/file-posix.c
View file

@ -3778,7 +3778,7 @@ static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag)
}
}
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked)
{
BDRVRawState *s = bs->opaque;
@ -3824,7 +3824,7 @@ static BlockDriver bdrv_host_cdrom = {
/* removable device support */
.bdrv_co_is_inserted = cdrom_co_is_inserted,
.bdrv_co_eject = cdrom_co_eject,
.bdrv_lock_medium = cdrom_lock_medium,
.bdrv_co_lock_medium = cdrom_co_lock_medium,
/* generic scsi device */
.bdrv_co_ioctl = hdev_co_ioctl,
@ -3906,7 +3906,7 @@ static void coroutine_fn cdrom_co_eject(BlockDriverState *bs, bool eject_flag)
cdrom_reopen(bs);
}
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
static void coroutine_fn cdrom_co_lock_medium(BlockDriverState *bs, bool locked)
{
BDRVRawState *s = bs->opaque;
@ -3953,7 +3953,7 @@ static BlockDriver bdrv_host_cdrom = {
/* removable device support */
.bdrv_co_is_inserted = cdrom_co_is_inserted,
.bdrv_co_eject = cdrom_co_eject,
.bdrv_lock_medium = cdrom_lock_medium,
.bdrv_co_lock_medium = cdrom_co_lock_medium,
};
#endif /* __FreeBSD__ */