[PATCH 6.10 257/375] cachefiles: Set the max subreq size for cache writes to MAX_RW_COUNT

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

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

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

From: David Howells <dhowells@redhat.com>

[ Upstream commit 51d37982bbac3ea0ca21b2797a9cb0044272b3aa ]

Set the maximum size of a subrequest that writes to cachefiles to be
MAX_RW_COUNT so that we don't overrun the maximum write we can make to the
backing filesystem.

Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/1599005.1721398742@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/cachefiles/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index e667dbcd20e8..a91acd03ee12 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -630,7 +630,7 @@ static void cachefiles_prepare_write_subreq(struct netfs_io_subrequest *subreq)
 
 	_enter("W=%x[%x] %llx", wreq->debug_id, subreq->debug_index, subreq->start);
 
-	subreq->max_len = ULONG_MAX;
+	subreq->max_len = MAX_RW_COUNT;
 	subreq->max_nr_segs = BIO_MAX_VECS;
 
 	if (!cachefiles_cres_file(cres)) {
-- 
2.43.0