mirror of https://gitee.com/openkylin/linux.git
[PATCH] cifs: Ease memory pressure, do not use large buffers in byte range lock requests.
Signed-off-by: Steve French (sfrench@us.ibm.com) Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Steve French
Linus Torvalds
parent
79944bf713
commit
46810cbf3d
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@ -1023,11 +1023,13 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
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__u16 count;
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cFYI(1, ("In CIFSSMBLock - timeout %d numLock %d",waitFlag,numLock));
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rc = smb_init(SMB_COM_LOCKING_ANDX, 8, tcon, (void **) &pSMB,
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(void **) &pSMBr);
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rc = small_smb_init(SMB_COM_LOCKING_ANDX, 8, tcon, (void **) &pSMB);
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if (rc)
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return rc;
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pSMBr = (LOCK_RSP *)pSMB; /* BB removeme BB */
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if(lockType == LOCKING_ANDX_OPLOCK_RELEASE) {
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timeout = -1; /* no response expected */
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pSMB->Timeout = 0;
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@ -1065,7 +1067,7 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
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if (rc) {
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cFYI(1, ("Send error in Lock = %d", rc));
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}
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cifs_buf_release(pSMB);
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cifs_small_buf_release(pSMB);
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/* Note: On -EAGAIN error only caller can retry on handle based calls
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since file handle passed in no longer valid */
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@ -294,154 +294,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
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csocket = server->ssocket;
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wake_up(&server->response_q);
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continue;
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} else if (length > 3) {
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pdu_length = ntohl(smb_buffer->smb_buf_length);
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/* Only read pdu_length after below checks for too short (due
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to e.g. int overflow) and too long ie beyond end of buf */
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cFYI(1,("rfc1002 length(big endian)0x%x)",
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pdu_length+4));
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temp = (char *) smb_buffer;
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if (temp[0] == (char) RFC1002_SESSION_KEEP_ALIVE) {
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cFYI(0,("Received 4 byte keep alive packet"));
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} else if (temp[0] ==
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(char) RFC1002_POSITIVE_SESSION_RESPONSE) {
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cFYI(1,("Good RFC 1002 session rsp"));
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} else if (temp[0] ==
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(char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
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/* we get this from Windows 98 instead of
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an error on SMB negprot response */
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cFYI(1,("Negative RFC 1002 Session Response Error 0x%x)",temp[4]));
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if(server->tcpStatus == CifsNew) {
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/* if nack on negprot (rather than
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ret of smb negprot error) reconnecting
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not going to help, ret error to mount */
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break;
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} else {
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/* give server a second to
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clean up before reconnect attempt */
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msleep(1000);
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/* always try 445 first on reconnect
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since we get NACK on some if we ever
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connected to port 139 (the NACK is
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since we do not begin with RFC1001
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session initialize frame) */
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server->addr.sockAddr.sin_port =
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htons(CIFS_PORT);
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cifs_reconnect(server);
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csocket = server->ssocket;
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wake_up(&server->response_q);
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continue;
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}
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} else if (temp[0] != (char) 0) {
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cERROR(1,("Unknown RFC 1002 frame"));
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cifs_dump_mem(" Received Data: ", temp, length);
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cifs_reconnect(server);
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csocket = server->ssocket;
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continue;
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} else {
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if((pdu_length > CIFSMaxBufSize +
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MAX_CIFS_HDR_SIZE - 4) ||
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(pdu_length < sizeof (struct smb_hdr) - 1 - 4)) {
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cERROR(1,
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("Invalid size SMB length %d and pdu_length %d",
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length, pdu_length+4));
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cifs_reconnect(server);
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csocket = server->ssocket;
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wake_up(&server->response_q);
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continue;
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} else { /* length ok */
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if(pdu_length > MAX_CIFS_HDR_SIZE - 4) {
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isLargeBuf = TRUE;
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memcpy(bigbuf, smallbuf, 4);
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smb_buffer = bigbuf;
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}
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length = 0;
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iov.iov_base = 4 + (char *)smb_buffer;
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iov.iov_len = pdu_length;
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for (total_read = 0;
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total_read < pdu_length;
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total_read += length) {
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length = kernel_recvmsg(csocket, &smb_msg,
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&iov, 1,
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pdu_length - total_read, 0);
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if((server->tcpStatus == CifsExiting) ||
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(length == -EINTR)) {
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/* then will exit */
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goto dmx_loop_end;
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} else if (server->tcpStatus ==
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CifsNeedReconnect) {
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cifs_reconnect(server);
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csocket = server->ssocket;
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/* Reconnect wakes up rspns q */
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/* Now we will reread sock */
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goto dmx_loop_end;
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} else if ((length == -ERESTARTSYS) ||
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(length == -EAGAIN)) {
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msleep(1); /* minimum sleep to prevent looping
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allowing socket to clear and app threads to set
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tcpStatus CifsNeedReconnect if server hung */
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continue;
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} else if (length <= 0) {
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cERROR(1,
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("Received no data, expecting %d",
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pdu_length - total_read));
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cifs_reconnect(server);
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csocket = server->ssocket;
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goto dmx_loop_end;
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}
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}
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length += 4; /* account for rfc1002 hdr */
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}
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dump_smb(smb_buffer, length);
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if (checkSMB
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(smb_buffer, smb_buffer->Mid, total_read+4)) {
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cERROR(1, ("Bad SMB Received "));
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continue;
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}
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/* BB FIXME - add checkTrans2SMBSecondary() */
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task_to_wake = NULL;
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spin_lock(&GlobalMid_Lock);
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list_for_each(tmp, &server->pending_mid_q) {
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mid_entry = list_entry(tmp, struct
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mid_q_entry,
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qhead);
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if ((mid_entry->mid == smb_buffer->Mid)
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&& (mid_entry->midState ==
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MID_REQUEST_SUBMITTED)
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&& (mid_entry->command ==
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smb_buffer->Command)) {
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cFYI(1,("Found Mid 0x%x wake up"
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,mid_entry->mid));
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task_to_wake = mid_entry->tsk;
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mid_entry->resp_buf =
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smb_buffer;
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mid_entry->midState =
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MID_RESPONSE_RECEIVED;
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if(isLargeBuf)
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mid_entry->largeBuf = 1;
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else
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mid_entry->largeBuf = 0;
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}
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}
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spin_unlock(&GlobalMid_Lock);
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if (task_to_wake) {
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if(isLargeBuf)
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bigbuf = NULL;
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else
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smallbuf = NULL;
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smb_buffer = NULL; /* will be freed by users thread after he is done */
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wake_up_process(task_to_wake);
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} else if (is_valid_oplock_break(smb_buffer) == FALSE) {
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cERROR(1, ("No task to wake, unknown frame rcvd!"));
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cifs_dump_mem("Received Data is: ",temp,sizeof(struct smb_hdr));
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}
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}
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} else {
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} else if (length < 4) {
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cFYI(1,
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("Frame less than four bytes received %d bytes long.",
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length));
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@ -450,9 +303,159 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
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wake_up(&server->response_q);
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continue;
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}
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dmx_loop_end:
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cFYI(1,("Exiting cifsd loop"));
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/* the right amount was read from socket - 4 bytes */
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pdu_length = ntohl(smb_buffer->smb_buf_length);
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cFYI(1,("rfc1002 length(big endian)0x%x)", pdu_length+4));
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temp = (char *) smb_buffer;
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if (temp[0] == (char) RFC1002_SESSION_KEEP_ALIVE) {
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cFYI(0,("Received 4 byte keep alive packet"));
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} else if (temp[0] == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
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cFYI(1,("Good RFC 1002 session rsp"));
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} else if (temp[0] == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
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/* we get this from Windows 98 instead of
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an error on SMB negprot response */
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cFYI(1,("Negative RFC 1002 Session Response Error 0x%x)",temp[4]));
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if(server->tcpStatus == CifsNew) {
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/* if nack on negprot (rather than
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ret of smb negprot error) reconnecting
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not going to help, ret error to mount */
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break;
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} else {
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/* give server a second to
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clean up before reconnect attempt */
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msleep(1000);
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/* always try 445 first on reconnect
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since we get NACK on some if we ever
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connected to port 139 (the NACK is
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since we do not begin with RFC1001
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session initialize frame) */
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server->addr.sockAddr.sin_port =
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htons(CIFS_PORT);
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cifs_reconnect(server);
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csocket = server->ssocket;
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wake_up(&server->response_q);
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continue;
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}
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} else if (temp[0] != (char) 0) {
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cERROR(1,("Unknown RFC 1002 frame"));
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cifs_dump_mem(" Received Data: ", temp, length);
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cifs_reconnect(server);
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csocket = server->ssocket;
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continue;
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} else { /* we have an SMB response */
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if((pdu_length > CIFSMaxBufSize +
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MAX_CIFS_HDR_SIZE - 4) ||
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(pdu_length < sizeof (struct smb_hdr) - 1 - 4)) {
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cERROR(1,
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("Invalid size SMB length %d and pdu_length %d",
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length, pdu_length+4));
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cifs_reconnect(server);
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csocket = server->ssocket;
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wake_up(&server->response_q);
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continue;
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} else { /* length ok */
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int reconnect = 0;
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if(pdu_length > MAX_CIFS_HDR_SIZE - 4) {
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isLargeBuf = TRUE;
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memcpy(bigbuf, smallbuf, 4);
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smb_buffer = bigbuf;
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}
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length = 0;
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iov.iov_base = 4 + (char *)smb_buffer;
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iov.iov_len = pdu_length;
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for (total_read = 0;
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total_read < pdu_length;
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total_read += length) {
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length = kernel_recvmsg(csocket, &smb_msg,
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&iov, 1,
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pdu_length - total_read, 0);
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if((server->tcpStatus == CifsExiting) ||
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(length == -EINTR)) {
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/* then will exit */
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reconnect = 2;
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break;
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} else if (server->tcpStatus ==
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CifsNeedReconnect) {
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cifs_reconnect(server);
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csocket = server->ssocket;
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/* Reconnect wakes up rspns q */
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/* Now we will reread sock */
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reconnect = 1;
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break;
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} else if ((length == -ERESTARTSYS) ||
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(length == -EAGAIN)) {
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msleep(1); /* minimum sleep to prevent looping
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allowing socket to clear and app threads to set
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tcpStatus CifsNeedReconnect if server hung */
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continue;
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} else if (length <= 0) {
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cERROR(1,("Received no data, expecting %d",
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pdu_length - total_read));
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cifs_reconnect(server);
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csocket = server->ssocket;
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reconnect = 1;
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break;
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}
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}
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if(reconnect == 2)
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break;
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else if(reconnect == 1)
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continue;
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length += 4; /* account for rfc1002 hdr */
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}
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dump_smb(smb_buffer, length);
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if (checkSMB
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(smb_buffer, smb_buffer->Mid, total_read+4)) {
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cERROR(1, ("Bad SMB Received "));
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continue;
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}
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task_to_wake = NULL;
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spin_lock(&GlobalMid_Lock);
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list_for_each(tmp, &server->pending_mid_q) {
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mid_entry = list_entry(tmp, struct mid_q_entry,
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qhead);
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if ((mid_entry->mid == smb_buffer->Mid)
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&& (mid_entry->midState ==
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MID_REQUEST_SUBMITTED)
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&& (mid_entry->command ==
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smb_buffer->Command)) {
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cFYI(1,("Found Mid 0x%x wake up"
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,mid_entry->mid));
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/* BB FIXME - missing code here BB */
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/* check_2nd_t2(smb_buffer); */
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task_to_wake = mid_entry->tsk;
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mid_entry->resp_buf =
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smb_buffer;
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mid_entry->midState =
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MID_RESPONSE_RECEIVED;
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if(isLargeBuf)
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mid_entry->largeBuf = 1;
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else
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mid_entry->largeBuf = 0;
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}
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}
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spin_unlock(&GlobalMid_Lock);
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if (task_to_wake) {
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if(isLargeBuf)
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bigbuf = NULL;
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else
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smallbuf = NULL;
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smb_buffer = NULL; /* will be freed by users thread after he is done */
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wake_up_process(task_to_wake);
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} else if (is_valid_oplock_break(smb_buffer) == FALSE) {
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cERROR(1, ("No task to wake, unknown frame rcvd!"));
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cifs_dump_mem("Received Data is: ",temp,sizeof(struct smb_hdr));
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}
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}
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}
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spin_lock(&GlobalMid_Lock);
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server->tcpStatus = CifsExiting;
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