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CIFS: Fix credits calculations for reads with errors

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Currently we mark MID as malformed if we get an error from server
in a read response. This leads to not properly processing credits
in the readv callback. Fix this by marking such a response as
normal received response and process it appropriately.

Cc: <stable@vger.kernel.org>
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 2019-01-17 15:29:26 -08:00 committed by Steve French
parent ef68e83184
commit 8004c78c68
1 changed files with 23 additions and 12 deletions
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35
fs/cifs/cifssmb.c
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@ -1549,18 +1549,26 @@ cifs_discard_remaining_data(struct TCP_Server_Info *server)
}
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
__cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid,
bool malformed)
{
int length;
struct cifs_readdata *rdata = mid->callback_data;
length = cifs_discard_remaining_data(server);
dequeue_mid(mid, rdata->result);
dequeue_mid(mid, malformed);
mid->resp_buf = server->smallbuf;
server->smallbuf = NULL;
return length;
}
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
struct cifs_readdata *rdata = mid->callback_data;
return __cifs_readv_discard(server, mid, rdata->result);
}
int
cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
@ -1602,12 +1610,23 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
return -1;
}
/* set up first two iov for signature check and to get credits */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len = server->total_read - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
rdata->iov[1].iov_base, rdata->iov[1].iov_len);
/* Was the SMB read successful? */
rdata->result = server->ops->map_error(buf, false);
if (rdata->result != 0) {
cifs_dbg(FYI, "%s: server returned error %d\n",
__func__, rdata->result);
return cifs_readv_discard(server, mid);
/* normal error on read response */
return __cifs_readv_discard(server, mid, false);
}
/* Is there enough to get to the rest of the READ_RSP header? */
@ -1651,14 +1670,6 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
server->total_read += length;
}
/* set up first iov for signature check */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len = server->total_read - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%u\n",
rdata->iov[0].iov_base, server->total_read);
/* how much data is in the response? */
#ifdef CONFIG_CIFS_SMB_DIRECT
use_rdma_mr = rdata->mr;