linux-kernel - Re: Reference to non-existing CONFIG_NETFS

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Date: Mon, 08 Jan 2024 21:41:35 +0000
From: David Howells <dhowells@...hat.com>
To: Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc: dhowells@...hat.com, linux-cachefs@...hat.com,
    linux-fsdevel <linux-fsdevel@...r.kernel.org>,
    Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Reference to non-existing CONFIG_NETFS_FSCACHE

Lukas Bulwahn <lukas.bulwahn@...il.com> wrote:

> In commit 62c3b7481b9a ("netfs: Provide a writepages implementation"),
> you have added some code that is included under #ifdef
> CONFIG_NETFS_FSCACHE, but if I read the code correctly, the actual
> intended config here is called CONFIG_FSCACHE.

Yeah - it should be the latter.  Something like the attached patch should fix
it.

David
---
netfs: Fix wrong #ifdef hiding wait

netfs_writepages_begin() has the wait on the fscache folio conditional on
CONFIG_NETFS_FSCACHE - which doesn't exist.

Fix it to be conditional on CONFIG_FSCACHE instead.

Fixes: 62c3b7481b9a ("netfs: Provide a writepages implementation")
Reported-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Matthew Wilcox <willy@...radead.org>
cc: linux-afs@...ts.infradead.org
cc: linux-cachefs@...hat.com
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
---
 fs/netfs/buffered_write.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index 0b2b7a60dabc..de517ca70d91 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -1076,7 +1076,7 @@ static ssize_t netfs_writepages_begin(struct address_space *mapping,
 		folio_unlock(folio);
 		if (wbc->sync_mode != WB_SYNC_NONE) {
 			folio_wait_writeback(folio);
-#ifdef CONFIG_NETFS_FSCACHE
+#ifdef CONFIG_FSCACHE
 			folio_wait_fscache(folio);
 #endif
 			goto lock_again;