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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Steve French <stfrench@microsoft.com>,
        Ronnie Sahlberg <lsahlber@redhat.com>,
        Pavel Shilovsky <pshilov@microsoft.com>
Subject: [PATCH 4.4 26/73] SMB3: retry on STATUS_INSUFFICIENT_RESOURCES instead of failing write
Date:   Mon,  8 Jul 2019 17:12:36 +0200
Message-Id: <20190708150522.379448483@linuxfoundation.org>
In-Reply-To: <20190708150513.136580595@linuxfoundation.org>
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From: Steve French <stfrench@microsoft.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@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/fs/cifs/smb2maperror.c
+++ b/fs/cifs/smb2maperror.c
@@ -455,7 +455,7 @@ 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"},