The patch below does not apply to the 4.20-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 082aaa8700415f6471ec9c5ef0c8307ca214989a Mon Sep 17 00:00:00 2001
From: Pavel Shilovsky pshilov@microsoft.com Date: Fri, 18 Jan 2019 15:54:34 -0800 Subject: [PATCH] CIFS: Do not consider -ENODATA as stat failure for reads
When doing reads beyound the end of a file the server returns error STATUS_END_OF_FILE error which is mapped to -ENODATA. Currently we report it as a failure which confuses read stats. Change it to not consider -ENODATA as failure for stat purposes.
Signed-off-by: Pavel Shilovsky pshilov@microsoft.com Signed-off-by: Steve French stfrench@microsoft.com CC: Stable stable@vger.kernel.org
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index d858dc04fdc3..ef52d6642431 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -3241,7 +3241,7 @@ smb2_readv_callback(struct mid_q_entry *mid) rdata->mr = NULL; } #endif - if (rdata->result) { + if (rdata->result && rdata->result != -ENODATA) { cifs_stats_fail_inc(tcon, SMB2_READ_HE); trace_smb3_read_err(0 /* xid */, rdata->cfile->fid.persistent_fid,