[Patch (resend) 4/5] cifs: smbd: Retry on memory registration failure

[Long Li]

From: Long Li <lon...@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 <lon...@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