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|
/*
* SMB1 (CIFS) version specific operations
*
* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published
* by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/pagemap.h>
#include <linux/vfs.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifspdu.h"
/*
* An NT cancel request header looks just like the original request except:
*
* The Command is SMB_COM_NT_CANCEL
* The WordCount is zeroed out
* The ByteCount is zeroed out
*
* This function mangles an existing request buffer into a
* SMB_COM_NT_CANCEL request and then sends it.
*/
static int
send_nt_cancel(struct TCP_Server_Info *server, void *buf,
struct mid_q_entry *mid)
{
int rc = 0;
struct smb_hdr *in_buf = (struct smb_hdr *)buf;
/* -4 for RFC1001 length and +2 for BCC field */
in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
in_buf->Command = SMB_COM_NT_CANCEL;
in_buf->WordCount = 0;
put_bcc(0, in_buf);
mutex_lock(&server->srv_mutex);
rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
if (rc) {
mutex_unlock(&server->srv_mutex);
return rc;
}
/*
* The response to this call was already factored into the sequence
* number when the call went out, so we must adjust it back downward
* after signing here.
*/
--server->sequence_number;
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
if (rc < 0)
server->sequence_number--;
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
in_buf->Mid, rc);
return rc;
}
static bool
cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
{
return ob1->fid.netfid == ob2->fid.netfid;
}
static unsigned int
cifs_read_data_offset(char *buf)
{
READ_RSP *rsp = (READ_RSP *)buf;
return le16_to_cpu(rsp->DataOffset);
}
static unsigned int
cifs_read_data_length(char *buf)
{
READ_RSP *rsp = (READ_RSP *)buf;
return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
le16_to_cpu(rsp->DataLength);
}
static struct mid_q_entry *
cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
{
struct smb_hdr *buf = (struct smb_hdr *)buffer;
struct mid_q_entry *mid;
spin_lock(&GlobalMid_Lock);
list_for_each_entry(mid, &server->pending_mid_q, qhead) {
if (mid->mid == buf->Mid &&
mid->mid_state == MID_REQUEST_SUBMITTED &&
le16_to_cpu(mid->command) == buf->Command) {
spin_unlock(&GlobalMid_Lock);
return mid;
}
}
spin_unlock(&GlobalMid_Lock);
return NULL;
}
static void
cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
const int optype)
{
spin_lock(&server->req_lock);
server->credits += add;
server->in_flight--;
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
static void
cifs_set_credits(struct TCP_Server_Info *server, const int val)
{
spin_lock(&server->req_lock);
server->credits = val;
server->oplocks = val > 1 ? enable_oplocks : false;
spin_unlock(&server->req_lock);
}
static int *
cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
return &server->credits;
}
static unsigned int
cifs_get_credits(struct mid_q_entry *mid)
{
return 1;
}
/*
* Find a free multiplex id (SMB mid). Otherwise there could be
* mid collisions which might cause problems, demultiplexing the
* wrong response to this request. Multiplex ids could collide if
* one of a series requests takes much longer than the others, or
* if a very large number of long lived requests (byte range
* locks or FindNotify requests) are pending. No more than
* 64K-1 requests can be outstanding at one time. If no
* mids are available, return zero. A future optimization
* could make the combination of mids and uid the key we use
* to demultiplex on (rather than mid alone).
* In addition to the above check, the cifs demultiplex
* code already used the command code as a secondary
* check of the frame and if signing is negotiated the
* response would be discarded if the mid were the same
* but the signature was wrong. Since the mid is not put in the
* pending queue until later (when it is about to be dispatched)
* we do have to limit the number of outstanding requests
* to somewhat less than 64K-1 although it is hard to imagine
* so many threads being in the vfs at one time.
*/
static __u64
cifs_get_next_mid(struct TCP_Server_Info *server)
{
__u64 mid = 0;
__u16 last_mid, cur_mid;
bool collision;
spin_lock(&GlobalMid_Lock);
/* mid is 16 bit only for CIFS/SMB */
cur_mid
|