linux-kernel - [PATCH 4.14 47/51] SMB3: retry on STATUS_INSUFFICIENT

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Date:   Mon, 24 Jun 2019 17:57:05 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Steve French <stfrench@...rosoft.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Pavel Shilovsky <pshilov@...rosoft.com>
Subject: [PATCH 4.14 47/51] SMB3: retry on STATUS_INSUFFICIENT_RESOURCES instead of failing write

From: Steve French <stfrench@...rosoft.com>

commit 8d526d62db907e786fd88948c75d1833d82bd80e upstream.

Some servers such as Windows 10 will return STATUS_INSUFFICIENT_RESOURCES
as the number of simultaneous SMB3 requests grows (even though the client
has sufficient credits).  Return EAGAIN on STATUS_INSUFFICIENT_RESOURCES
so that we can retry writes which fail with this status code.

This (for example) fixes large file copies to Windows 10 on fast networks.

Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2maperror.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/smb2maperror.c
+++ b/fs/cifs/smb2maperror.c
@@ -456,7 +456,7 @@ static const struct status_to_posix_erro
 	{STATUS_FILE_INVALID, -EIO, "STATUS_FILE_INVALID"},
 	{STATUS_ALLOTTED_SPACE_EXCEEDED, -EIO,
 	"STATUS_ALLOTTED_SPACE_EXCEEDED"},
-	{STATUS_INSUFFICIENT_RESOURCES, -EREMOTEIO,
+	{STATUS_INSUFFICIENT_RESOURCES, -EAGAIN,
 				"STATUS_INSUFFICIENT_RESOURCES"},
 	{STATUS_DFS_EXIT_PATH_FOUND, -EIO, "STATUS_DFS_EXIT_PATH_FOUND"},
 	{STATUS_DEVICE_DATA_ERROR, -EIO, "STATUS_DEVICE_DATA_ERROR"},