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CIFS: Fix adjustment of credits for MTU requests 

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>
This commit is contained in:
Pavel Shilovsky 2018-12-19 22:49:09 +00:00 committed by Steve French
parent c715f89c4d
commit b983f7e923
1 changed files with 6 additions and 2 deletions
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8
fs/cifs/smb2pdu.c
View File

@ -3278,12 +3278,14 @@ smb2_async_readv(struct cifs_readdata *rdata)
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;
}
@ -3555,12 +3557,14 @@ smb2_async_writev(struct cifs_writedata *wdata,
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;
}