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@codewreck.org>
Co-authored-by: David Howells <dhowells@redhat.com>
Cc: stable@vger.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

Dominique Martinet <asmadeus@codewreck.org> wrote:

> 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@codewreck.org>
> Co-authored-by: David Howells <dhowells@redhat.com>
> Cc: stable@vger.kernel.org

I think you want this also:

Fixes: eb497943fa21 ("9p: Convert to using the netfs helper lib to do reads and caching")

Reviewed-by: David Howells <dhowells@redhat.com>

David Howells <dhowells@redhat.com> wrote:

> Reviewed-by: David Howells <dhowells@redhat.com>

Make that:

Reviewed-and-tested-by: David Howells <dhowells@redhat.com>