4.20-stable review patch. If anyone has any objections, please let me know.
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From: Pavel Shilovsky pshilov@microsoft.com
commit b983f7e92348d7e7d091db1b78b7915e9dd3d63a upstream.
Currently for MTU requests we allocate maximum possible credits in advance and then adjust them according to the request size. While we were adjusting the number of credits belonging to the server, we were skipping adjustment of credits belonging to the request. This patch fixes it by setting request credits to CreditCharge field value of SMB2 packet header.
Also ask 1 credit more for async read and write operations to increase parallelism and match the behavior of other operations.
Signed-off-by: Pavel Shilovsky pshilov@microsoft.com Signed-off-by: Steve French stfrench@microsoft.com CC: Stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/smb2pdu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -3197,12 +3197,14 @@ smb2_async_readv(struct cifs_readdata *r if (rdata->credits) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, SMB2_MAX_BUFFER_SIZE)); - shdr->CreditRequest = shdr->CreditCharge; + shdr->CreditRequest = + cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1); spin_lock(&server->req_lock); server->credits += rdata->credits - le16_to_cpu(shdr->CreditCharge); spin_unlock(&server->req_lock); wake_up(&server->request_q); + rdata->credits = le16_to_cpu(shdr->CreditCharge); flags |= CIFS_HAS_CREDITS; }
@@ -3474,12 +3476,14 @@ smb2_async_writev(struct cifs_writedata if (wdata->credits) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, SMB2_MAX_BUFFER_SIZE)); - shdr->CreditRequest = shdr->CreditCharge; + shdr->CreditRequest = + cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1); spin_lock(&server->req_lock); server->credits += wdata->credits - le16_to_cpu(shdr->CreditCharge); spin_unlock(&server->req_lock); wake_up(&server->request_q); + wdata->credits = le16_to_cpu(shdr->CreditCharge); flags |= CIFS_HAS_CREDITS; }