linux-kernel - [PATCH] 9p: fix enodata when reading growing file

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Message-Id: <20220110111444.926753-1-asmadeus@codewreck.org>
Date:   Mon, 10 Jan 2022 20:14:44 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     dhowells@...hat.com, v9fs-developer@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, lucho@...kov.net, ericvh@...il.com,
        Dominique Martinet <asmadeus@...ewreck.org>,
        stable@...r.kernel.org
Subject: [PATCH] 9p: fix enodata when reading growing file

Reading from a file that was just extended by a write, but the write had
not yet reached the server would return ENODATA as illustrated by this
command:
$ xfs_io -c 'open -ft test' -c 'w 4096 1000' -c 'r 0 1000'
wrote 1000/1000 bytes at offset 4096
1000.000000 bytes, 1 ops; 0.0001 sec (5.610 MiB/sec and 5882.3529 ops/sec)
pread: No data available

Fix this case by having netfs assume zeroes when reads from server come
short like AFS and CEPH do

Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Co-authored-by: David Howells <dhowells@...hat.com>
Cc: stable@...r.kernel.org
---
 fs/9p/vfs_addr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index c72e9f8f5f32..9a10e68c5f30 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -43,6 +43,11 @@ static void v9fs_req_issue_op(struct netfs_read_subrequest *subreq)
 	iov_iter_xarray(&to, READ, &rreq->mapping->i_pages, pos, len);
 
 	total = p9_client_read(fid, pos, &to, &err);
+
+	/* if we just extended the file size, any portion not in
+	 * cache won't be on server and is zeroes */
+	__set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
+
 	netfs_subreq_terminated(subreq, err ?: total, false);
 }
 
-- 
2.33.1