netfs: Fix missing barriers by using clear_and_wake_up_bit()

Use clear_and_wake_up_bit() rather than something like:

	clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
	wake_up_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS);

as there needs to be a barrier inserted between which is present in
clear_and_wake_up_bit().

Fixes: 288ace2 ("netfs: New writeback implementation")
Fixes: ee4cdf7 ("netfs: Speed up buffered reading")
Signed-off-by: David Howells <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Akira Yokosawa <[email protected]>
cc: Zilin Guan <[email protected]>
cc: Akira Yokosawa <[email protected]>
cc: Jeff Layton <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: Christian Brauner <[email protected]>

Author: dhowells

fs/netfs/read_collect.c

@@ -379,8 +379,7 @@ static void netfs_rreq_assess(struct netfs_io_request *rreq)
 	task_io_account_read(rreq->transferred);
 
 	trace_netfs_rreq(rreq, netfs_rreq_trace_wake_ip);
-	clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
-	wake_up_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS);
+	clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
 
 	trace_netfs_rreq(rreq, netfs_rreq_trace_done);
 	netfs_clear_subrequests(rreq, false);

fs/netfs/write_collect.c

@@ -501,8 +501,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
 		goto need_retry;
 	if ((notes & MADE_PROGRESS) && test_bit(NETFS_RREQ_PAUSE, &wreq->flags)) {
 		trace_netfs_rreq(wreq, netfs_rreq_trace_unpause);
-		clear_bit_unlock(NETFS_RREQ_PAUSE, &wreq->flags);
-		wake_up_bit(&wreq->flags, NETFS_RREQ_PAUSE);
+		clear_and_wake_up_bit(NETFS_RREQ_PAUSE, &wreq->flags);
 	}
 
 	if (notes & NEED_REASSESS) {
@@ -605,8 +604,7 @@ void netfs_write_collection_worker(struct work_struct *work)
 
 	_debug("finished");
 	trace_netfs_rreq(wreq, netfs_rreq_trace_wake_ip);
-	clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &wreq->flags);
-	wake_up_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS);
+	clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &wreq->flags);
 
 	if (wreq->iocb) {
 		size_t written = min(wreq->transferred, wreq->len);
@@ -714,8 +712,7 @@ void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error,
 
 	trace_netfs_sreq(subreq, netfs_sreq_trace_terminated);
 
-	clear_bit_unlock(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
-	wake_up_bit(&subreq->flags, NETFS_SREQ_IN_PROGRESS);
+	clear_and_wake_up_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
 
 	/* If we are at the head of the queue, wake up the collector,
 	 * transferring a ref to it if we were the ones to do so.