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block: Mark bdrv_co_ioctl() and callers GRAPH_RDLOCK 

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_co_ioctl() need to hold a reader lock for the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230203152202.49054-6-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-02-03 16:21:44 +01:00
parent 7ff9579e60
commit 26c518ab1e
5 changed files with 11 additions and 7 deletions
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1
block/block-backend.c
View File

@ -1672,6 +1672,7 @@ blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
IO_CODE();
blk_wait_while_drained(blk);
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
return -ENOMEDIUM;

1
block/io.c
View File

@ -3083,6 +3083,7 @@ int coroutine_fn bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf)
};
BlockAIOCB *acb;
IO_CODE();
assert_bdrv_graph_readable();
bdrv_inc_in_flight(bs);
if (!drv || (!drv->bdrv_aio_ioctl && !drv->bdrv_co_ioctl)) {

4
block/raw-format.c
View File

@ -415,8 +415,8 @@ static void coroutine_fn raw_co_lock_medium(BlockDriverState *bs, bool locked)
bdrv_co_lock_medium(bs->file->bs, locked);
}
static int coroutine_fn raw_co_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf)
static int coroutine_fn GRAPH_RDLOCK
raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
BDRVRawState *s = bs->opaque;
if (s->offset || s->has_size) {

3
include/block/block-io.h
View File

@ -97,7 +97,8 @@ void bdrv_aio_cancel(BlockAIOCB *acb);
void bdrv_aio_cancel_async(BlockAIOCB *acb);
/* sg packet commands */
int coroutine_fn bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf);
int coroutine_fn GRAPH_RDLOCK
bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf);
/* Ensure contents are flushed to disk. */
int coroutine_fn bdrv_co_flush(BlockDriverState *bs);

9
include/block/block_int-common.h
View File

@ -714,11 +714,12 @@ struct BlockDriver {
void coroutine_fn (*bdrv_co_lock_medium)(BlockDriverState *bs, bool locked);
/* to control generic scsi devices */
BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockAIOCB *coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_aio_ioctl)(
BlockDriverState *bs, unsigned long int req, void *buf,
BlockCompletionFunc *cb, void *opaque);
int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs,
unsigned long int req, void *buf);
int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_ioctl)(
BlockDriverState *bs, unsigned long int req, void *buf);
/*
* Returns 0 for completed check, -errno for internal errors.