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

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

[David Howells]

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>
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.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)) {

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

[Christian Brauner]

On Fri, 19 Jul 2024 15:19:02 +0100, David Howells wrote:
> 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.
> 
> 

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] cachefiles: Set the max subreq size for cache writes to MAX_RW_COUNT
      https://git.kernel.org/vfs/vfs/c/1275fb2bfa90