[PATCH 6.12 014/189] netfs: Fix is-caching check in read-retry

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@redhat.com>

[ Upstream commit d4e338de17cb6532bf805fae00db8b41e914009b ]

netfs: Fix is-caching check in read-retry

The read-retry code checks the NETFS_RREQ_COPY_TO_CACHE flag to determine
if there might be failed reads from the cache that need turning into reads
from the server, with the intention of skipping the complicated part if it
can.  The code that set the flag, however, got lost during the read-side
rewrite.

Fix the check to see if the cache_resources are valid instead.  The flag
can then be removed.

Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/3752048.1734381285@warthog.procyon.org.uk
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/netfs/read_retry.c | 2 +-
 include/linux/netfs.h | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c
index 0350592ea804..2701f7d45999 100644
--- a/fs/netfs/read_retry.c
+++ b/fs/netfs/read_retry.c
@@ -49,7 +49,7 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq)
 	 * up to the first permanently failed one.
 	 */
 	if (!rreq->netfs_ops->prepare_read &&
-	    !test_bit(NETFS_RREQ_COPY_TO_CACHE, &rreq->flags)) {
+	    !rreq->cache_resources.ops) {
 		struct netfs_io_subrequest *subreq;
 
 		list_for_each_entry(subreq, &rreq->subrequests, rreq_link) {
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 5eaceef41e6c..474481ee8b7c 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -269,7 +269,6 @@ struct netfs_io_request {
 	size_t			prev_donated;	/* Fallback for subreq->prev_donated */
 	refcount_t		ref;
 	unsigned long		flags;
-#define NETFS_RREQ_COPY_TO_CACHE	1	/* Need to write to the cache */
 #define NETFS_RREQ_NO_UNLOCK_FOLIO	2	/* Don't unlock no_unlock_folio on completion */
 #define NETFS_RREQ_DONT_UNLOCK_FOLIOS	3	/* Don't unlock the folios on completion */
 #define NETFS_RREQ_FAILED		4	/* The request failed */
-- 
2.39.5