linux-kernel - Re: [PATCH 21/26] netfs, 9p: Implement helpers for new write code

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Date: Thu, 04 Apr 2024 09:01:43 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>
Cc: dhowells@...hat.com, Jeff Layton <jlayton@...nel.org>,
    Gao Xiang <hsiangkao@...ux.alibaba.com>,
    Dominique Martinet <asmadeus@...ewreck.org>,
    Matthew Wilcox <willy@...radead.org>,
    Steve French <smfrench@...il.com>,
    Marc Dionne <marc.dionne@...istor.com>,
    Paulo Alcantara <pc@...guebit.com>,
    Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>,
    Eric Van Hensbergen <ericvh@...nel.org>,
    Ilya Dryomov <idryomov@...il.com>, netfs@...ts.linux.dev,
    linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
    linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
    ceph-devel@...r.kernel.org, v9fs@...ts.linux.dev,
    linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
    linux-mm@...ck.org, netdev@...r.kernel.org,
    linux-kernel@...r.kernel.org, Latchesar Ionkov <lucho@...kov.net>,
    Christian Schoenebeck <linux_oss@...debyte.com>
Subject: Re: [PATCH 21/26] netfs, 9p: Implement helpers for new write code

David Howells <dhowells@...hat.com> wrote:

> > +	size_t len = subreq->len - subreq->transferred;
> 
> This actually needs to be 'int len' because of the varargs packet formatter.

I think the attached change is what's required.

David
---
diff --git a/net/9p/client.c b/net/9p/client.c
index 844aca4fe4d8..04af2a7bf54b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1670,10 +1670,10 @@ p9_client_write_subreq(struct netfs_io_subrequest *subreq)
 	struct p9_client *clnt = fid->clnt;
 	struct p9_req_t *req;
 	unsigned long long start = subreq->start + subreq->transferred;
-	size_t len = subreq->len - subreq->transferred;
-	int written, err;
+	int written, len = subreq->len - subreq->transferred;
+	int err;
 
-	p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %zd\n",
+	p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
 		 fid->fid, start, len);
 
 	/* Don't bother zerocopy for small IO (< 1024) */
@@ -1699,11 +1699,11 @@ p9_client_write_subreq(struct netfs_io_subrequest *subreq)
 	}
 
 	if (written > len) {
-		pr_err("bogus RWRITE count (%d > %lu)\n", written, len);
+		pr_err("bogus RWRITE count (%d > %u)\n", written, len);
 		written = len;
 	}
 
-	p9_debug(P9_DEBUG_9P, "<<< RWRITE count %zd\n", len);
+	p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
 
 	p9_req_put(clnt, req);
 	netfs_write_subrequest_terminated(subreq, written, false);