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block/nfs: do not poll within a coroutine 

Since the former nfs_get_allocated_file_size is now a coroutine
function, it must suspend rather than poll.  Switch BDRV_POLL_WHILE()
to a qemu_coroutine_yield() loop and schedule nfs_co_generic_bh_cb()
in place of the call to bdrv_wakeup().

Fixes: 82618d7bc3 ("block: Convert bdrv_get_allocated_file_size() to co_wrapper", 2023-02-01)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230412112606.80983-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-04-12 13:26:06 +02:00
parent abb02ce0e7
commit 3fe64abcde
1 changed files with 13 additions and 11 deletions
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24
block/nfs.c
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@ -726,10 +726,8 @@ nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
if (task->ret < 0) {
error_report("NFS Error: %s", nfs_get_error(nfs));
}
/* Set task->complete before reading bs->wakeup. */
qatomic_mb_set(&task->complete, 1);
bdrv_wakeup(task->bs);
replay_bh_schedule_oneshot_event(task->client->aio_context,
nfs_co_generic_bh_cb, task);
}
static int64_t coroutine_fn nfs_co_get_allocated_file_size(BlockDriverState *bs)
@ -743,15 +741,19 @@ static int64_t coroutine_fn nfs_co_get_allocated_file_size(BlockDriverState *bs)
return client->st_blocks * 512;
}
task.bs = bs;
nfs_co_init_task(bs, &task);
task.st = &st;
if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb,
&task) != 0) {
return -ENOMEM;
}
WITH_QEMU_LOCK_GUARD(&client->mutex) {
if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb,
&task) != 0) {
return -ENOMEM;
}
nfs_set_events(client);
BDRV_POLL_WHILE(bs, !task.complete);
nfs_set_events(client);
}
while (!task.complete) {
qemu_coroutine_yield();
}
return (task.ret < 0 ? task.ret : st.st_blocks * 512);
}