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CIFS: Fix credit calculations in compound mid callback 

The current code doesn't do proper accounting for credits
in SMB1 case: it adds one credit per response only if we get
a complete response while it needs to return it unconditionally.
Fix this and also include malformed responses for SMB2+ into
accounting for credits because such responses have Credit
Granted field, thus nothing prevents to get a proper credit
value from them.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2019-01-22 16:50:21 -08:00 committed by Steve French
parent ec678eae74
commit 3d3003fce8
2 changed files with 6 additions and 11 deletions
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6
fs/cifs/smb2ops.c
View File

@ -154,7 +154,11 @@ smb2_get_credits(struct mid_q_entry *mid)
{
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
return le16_to_cpu(shdr->CreditRequest);
if (mid->mid_state == MID_RESPONSE_RECEIVED
|| mid->mid_state == MID_RESPONSE_MALFORMED)
return le16_to_cpu(shdr->CreditRequest);
return 0;
}
static int

11
fs/cifs/transport.c
View File

@ -786,17 +786,8 @@ static void
cifs_compound_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->server;
unsigned int optype = mid->optype;
unsigned int credits_received = 0;
if (mid->mid_state == MID_RESPONSE_RECEIVED) {
if (mid->resp_buf)
credits_received = server->ops->get_credits(mid);
else
cifs_dbg(FYI, "Bad state for cancelled MID\n");
}
add_credits(server, credits_received, optype);
add_credits(server, server->ops->get_credits(mid), mid->optype);
}
static void