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From:   Long Li <longli@linuxonhyperv.com>
To:     Steve French <sfrench@samba.org>, linux-cifs@vger.kernel.org,
        samba-technical@lists.samba.org, linux-kernel@vger.kernel.org
Cc:     Long Li <longli@microsoft.com>
Subject: [Patch (resend) 4/5] cifs: smbd: Retry on memory registration failure
Date:   Fri,  5 Apr 2019 21:36:34 +0000
Message-Id: <20190405213635.24383-4-longli@linuxonhyperv.com>
In-Reply-To: <20190405213635.24383-1-longli@linuxonhyperv.com>
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From: Long Li <longli@microsoft.com>

Memory registration failure doesn't mean this I/O has failed, it means the
transport is hitting I/O error or needs reconnect. This error is not from
the server.

Indicate this error to upper layer, and let upper layer decide how to
reconnect and proceed with this I/O.

Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/smb2pdu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 21ad01d..ff3b730 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3220,7 +3220,7 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
 				rdata->nr_pages, rdata->page_offset,
 				rdata->tailsz, true, need_invalidate);
 		if (!rdata->mr)
-			return -ENOBUFS;
+			return -EAGAIN;
 
 		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
 		if (need_invalidate)
@@ -3624,7 +3624,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
 				wdata->nr_pages, wdata->page_offset,
 				wdata->tailsz, false, need_invalidate);
 		if (!wdata->mr) {
-			rc = -ENOBUFS;
+			rc = -EAGAIN;
 			goto async_writev_out;
 		}
 		req->Length = 0;
-- 
2.7.4