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blkverify: Add locking for request_fn

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This is either bdrv_co_preadv() or bdrv_co_pwritev() which both need to
have the graph locked. Annotate the function pointer accordingly and add
locking to its callers.

This shouldn't actually have resulted in a bug because the graph lock is
already held by blkverify_co_prwv(), which waits for the coroutines to
terminate. Annotate with GRAPH_RDLOCK as well to make this clearer.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-19-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:27 +02:00
parent 004915a96a
commit 244b26d259
1 changed files with 11 additions and 5 deletions
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16
block/blkverify.c
View file

@ -33,8 +33,8 @@ typedef struct BlkverifyRequest {
uint64_t bytes;
int flags;
int (*request_fn)(BdrvChild *, int64_t, int64_t, QEMUIOVector *,
BdrvRequestFlags);
int GRAPH_RDLOCK_PTR (*request_fn)(
BdrvChild *, int64_t, int64_t, QEMUIOVector *, BdrvRequestFlags);
int ret; /* test image result */
int raw_ret; /* raw image result */
@ -170,8 +170,11 @@ static void coroutine_fn blkverify_do_test_req(void *opaque)
BlkverifyRequest *r = opaque;
BDRVBlkverifyState *s = r->bs->opaque;
bdrv_graph_co_rdlock();
r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov,
r->flags);
bdrv_graph_co_rdunlock();
r->done++;
qemu_coroutine_enter_if_inactive(r->co);
}
@ -180,13 +183,16 @@ static void coroutine_fn blkverify_do_raw_req(void *opaque)
{
BlkverifyRequest *r = opaque;
bdrv_graph_co_rdlock();
r->raw_ret = r->request_fn(r->bs->file, r->offset, r->bytes, r->raw_qiov,
r->flags);
bdrv_graph_co_rdunlock();
r->done++;
qemu_coroutine_enter_if_inactive(r->co);
}
static int coroutine_fn
static int coroutine_fn GRAPH_RDLOCK
blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset,
uint64_t bytes, QEMUIOVector *qiov, QEMUIOVector *raw_qiov,
int flags, bool is_write)
@ -222,7 +228,7 @@ blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset,
return r->ret;
}
static int coroutine_fn
static int coroutine_fn GRAPH_RDLOCK
blkverify_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{
@ -251,7 +257,7 @@ blkverify_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
return ret;
}
static int coroutine_fn
static int coroutine_fn GRAPH_RDLOCK
blkverify_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{