[PATCH] cachefiles: Set the max subreq size for cache writes to MAX_RW_COUNT

From: David Howells
Date: Fri Jul 19 2024 - 10:19:19 EST


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@xxxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: netfs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
---
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)) {