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cifs: convert send_nt_cancel into a version specific op 

For SMB2, this should be a no-op. Obviously if we wanted to do something
for the SMB2 case, we could also define an operation here for it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
This commit is contained in:
Jeff Layton 2012-05-15 12:21:10 -04:00 committed by Steve French
parent 23db65f511
commit 121b046af5
3 changed files with 54 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/cifs/cifsglob.h
View File

@ -154,7 +154,12 @@ enum smb_version {
Smb_1 = 1,
};
struct mid_q_entry;
struct TCP_Server_Info;
struct smb_version_operations {
int (*send_cancel)(struct TCP_Server_Info *, void *,
struct mid_q_entry *);
};
struct smb_version_values {
@ -718,7 +723,6 @@ static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
#endif
struct mid_q_entry;
/*
* This is the prototype for the mid receive function. This function is for

41
fs/cifs/smb1ops.c
View File

@ -18,8 +18,49 @@
*/
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.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;
}
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
mutex_unlock(&server->srv_mutex);
cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
in_buf->Mid, rc);
return rc;
}
struct smb_version_operations smb1_operations = {
.send_cancel = send_nt_cancel,
};
struct smb_version_values smb1_values = {

46
fs/cifs/transport.c
View File

@ -483,41 +483,11 @@ cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
return rc;
}
/*
* 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, struct smb_hdr *in_buf,
struct mid_q_entry *mid)
static inline int
send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid)
{
int rc = 0;
/* -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;
}
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
mutex_unlock(&server->srv_mutex);
cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
in_buf->Mid, rc);
return rc;
return server->ops->send_cancel ?
server->ops->send_cancel(server, buf, mid) : 0;
}
int
@ -636,7 +606,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
rc = wait_for_response(ses->server, midQ);
if (rc != 0) {
send_nt_cancel(ses->server, (struct smb_hdr *)buf, midQ);
send_cancel(ses->server, buf, midQ);
spin_lock(&GlobalMid_Lock);
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
midQ->callback = DeleteMidQEntry;
@ -753,7 +723,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
rc = wait_for_response(ses->server, midQ);
if (rc != 0) {
send_nt_cancel(ses->server, in_buf, midQ);
send_cancel(ses->server, in_buf, midQ);
spin_lock(&GlobalMid_Lock);
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
/* no longer considered to be "in-flight" */
@ -898,7 +868,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
if (in_buf->Command == SMB_COM_TRANSACTION2) {
/* POSIX lock. We send a NT_CANCEL SMB to cause the
blocking lock to return. */
rc = send_nt_cancel(ses->server, in_buf, midQ);
rc = send_cancel(ses->server, in_buf, midQ);
if (rc) {
delete_mid(midQ);
return rc;
@ -919,7 +889,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
rc = wait_for_response(ses->server, midQ);
if (rc) {
send_nt_cancel(ses->server, in_buf, midQ);
send_cancel(ses->server, in_buf, midQ);
spin_lock(&GlobalMid_Lock);
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
/* no longer considered to be "in-flight" */