diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/cifs/transport.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/cifs/transport.c | 956 |
1 files changed, 0 insertions, 956 deletions
diff --git a/ANDROID_3.4.5/fs/cifs/transport.c b/ANDROID_3.4.5/fs/cifs/transport.c deleted file mode 100644 index 09613365..00000000 --- a/ANDROID_3.4.5/fs/cifs/transport.c +++ /dev/null @@ -1,956 +0,0 @@ -/* - * fs/cifs/transport.c - * - * Copyright (C) International Business Machines Corp., 2002,2008 - * Author(s): Steve French (sfrench@us.ibm.com) - * Jeremy Allison (jra@samba.org) 2006. - * - * This library is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License as published - * by the Free Software Foundation; either version 2.1 of the License, or - * (at your option) any later version. - * - * 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/fs.h> -#include <linux/list.h> -#include <linux/gfp.h> -#include <linux/wait.h> -#include <linux/net.h> -#include <linux/delay.h> -#include <linux/freezer.h> -#include <asm/uaccess.h> -#include <asm/processor.h> -#include <linux/mempool.h> -#include "cifspdu.h" -#include "cifsglob.h" -#include "cifsproto.h" -#include "cifs_debug.h" - -extern mempool_t *cifs_mid_poolp; - -static void -wake_up_task(struct mid_q_entry *mid) -{ - wake_up_process(mid->callback_data); -} - -struct mid_q_entry * -AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) -{ - struct mid_q_entry *temp; - - if (server == NULL) { - cERROR(1, "Null TCP session in AllocMidQEntry"); - return NULL; - } - - temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); - if (temp == NULL) - return temp; - else { - memset(temp, 0, sizeof(struct mid_q_entry)); - temp->mid = smb_buffer->Mid; /* always LE */ - temp->pid = current->pid; - temp->command = cpu_to_le16(smb_buffer->Command); - cFYI(1, "For smb_command %d", smb_buffer->Command); - /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ - /* when mid allocated can be before when sent */ - temp->when_alloc = jiffies; - - /* - * The default is for the mid to be synchronous, so the - * default callback just wakes up the current task. - */ - temp->callback = wake_up_task; - temp->callback_data = current; - } - - atomic_inc(&midCount); - temp->mid_state = MID_REQUEST_ALLOCATED; - return temp; -} - -void -DeleteMidQEntry(struct mid_q_entry *midEntry) -{ -#ifdef CONFIG_CIFS_STATS2 - unsigned long now; -#endif - midEntry->mid_state = MID_FREE; - atomic_dec(&midCount); - if (midEntry->large_buf) - cifs_buf_release(midEntry->resp_buf); - else - cifs_small_buf_release(midEntry->resp_buf); -#ifdef CONFIG_CIFS_STATS2 - now = jiffies; - /* commands taking longer than one second are indications that - something is wrong, unless it is quite a slow link or server */ - if ((now - midEntry->when_alloc) > HZ) { - if ((cifsFYI & CIFS_TIMER) && - (midEntry->command != cpu_to_le16(SMB_COM_LOCKING_ANDX))) { - printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", - midEntry->command, midEntry->mid); - printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", - now - midEntry->when_alloc, - now - midEntry->when_sent, - now - midEntry->when_received); - } - } -#endif - mempool_free(midEntry, cifs_mid_poolp); -} - -static void -delete_mid(struct mid_q_entry *mid) -{ - spin_lock(&GlobalMid_Lock); - list_del(&mid->qhead); - spin_unlock(&GlobalMid_Lock); - - DeleteMidQEntry(mid); -} - -static int -smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) -{ - int rc = 0; - int i = 0; - struct msghdr smb_msg; - __be32 *buf_len = (__be32 *)(iov[0].iov_base); - unsigned int len = iov[0].iov_len; - unsigned int total_len; - int first_vec = 0; - unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); - struct socket *ssocket = server->ssocket; - - if (ssocket == NULL) - return -ENOTSOCK; /* BB eventually add reconnect code here */ - - smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; - smb_msg.msg_namelen = sizeof(struct sockaddr); - smb_msg.msg_control = NULL; - smb_msg.msg_controllen = 0; - if (server->noblocksnd) - smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; - else - smb_msg.msg_flags = MSG_NOSIGNAL; - - total_len = 0; - for (i = 0; i < n_vec; i++) - total_len += iov[i].iov_len; - - cFYI(1, "Sending smb: total_len %d", total_len); - dump_smb(iov[0].iov_base, len); - - i = 0; - while (total_len) { - rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], - n_vec - first_vec, total_len); - if ((rc == -ENOSPC) || (rc == -EAGAIN)) { - i++; - /* - * If blocking send we try 3 times, since each can block - * for 5 seconds. For nonblocking we have to try more - * but wait increasing amounts of time allowing time for - * socket to clear. The overall time we wait in either - * case to send on the socket is about 15 seconds. - * Similarly we wait for 15 seconds for a response from - * the server in SendReceive[2] for the server to send - * a response back for most types of requests (except - * SMB Write past end of file which can be slow, and - * blocking lock operations). NFS waits slightly longer - * than CIFS, but this can make it take longer for - * nonresponsive servers to be detected and 15 seconds - * is more than enough time for modern networks to - * send a packet. In most cases if we fail to send - * after the retries we will kill the socket and - * reconnect which may clear the network problem. - */ - if ((i >= 14) || (!server->noblocksnd && (i > 2))) { - cERROR(1, "sends on sock %p stuck for 15 seconds", - ssocket); - rc = -EAGAIN; - break; - } - msleep(1 << i); - continue; - } - if (rc < 0) - break; - - if (rc == total_len) { - total_len = 0; - break; - } else if (rc > total_len) { - cERROR(1, "sent %d requested %d", rc, total_len); - break; - } - if (rc == 0) { - /* should never happen, letting socket clear before - retrying is our only obvious option here */ - cERROR(1, "tcp sent no data"); - msleep(500); - continue; - } - total_len -= rc; - /* the line below resets i */ - for (i = first_vec; i < n_vec; i++) { - if (iov[i].iov_len) { - if (rc > iov[i].iov_len) { - rc -= iov[i].iov_len; - iov[i].iov_len = 0; - } else { - iov[i].iov_base += rc; - iov[i].iov_len -= rc; - first_vec = i; - break; - } - } - } - i = 0; /* in case we get ENOSPC on the next send */ - } - - if ((total_len > 0) && (total_len != smb_buf_length + 4)) { - cFYI(1, "partial send (%d remaining), terminating session", - total_len); - /* If we have only sent part of an SMB then the next SMB - could be taken as the remainder of this one. We need - to kill the socket so the server throws away the partial - SMB */ - server->tcpStatus = CifsNeedReconnect; - } - - if (rc < 0 && rc != -EINTR) - cERROR(1, "Error %d sending data on socket to server", rc); - else - rc = 0; - - /* Don't want to modify the buffer as a side effect of this call. */ - *buf_len = cpu_to_be32(smb_buf_length); - - return rc; -} - -int -smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, - unsigned int smb_buf_length) -{ - struct kvec iov; - - iov.iov_base = smb_buffer; - iov.iov_len = smb_buf_length + 4; - - return smb_sendv(server, &iov, 1); -} - -static int -wait_for_free_credits(struct TCP_Server_Info *server, const int optype, - int *credits) -{ - int rc; - - spin_lock(&server->req_lock); - if (optype == CIFS_ASYNC_OP) { - /* oplock breaks must not be held up */ - server->in_flight++; - *credits -= 1; - spin_unlock(&server->req_lock); - return 0; - } - - while (1) { - if (*credits <= 0) { - spin_unlock(&server->req_lock); - cifs_num_waiters_inc(server); - rc = wait_event_killable(server->request_q, - has_credits(server, credits)); - cifs_num_waiters_dec(server); - if (rc) - return rc; - spin_lock(&server->req_lock); - } else { - if (server->tcpStatus == CifsExiting) { - spin_unlock(&server->req_lock); - return -ENOENT; - } - - /* - * Can not count locking commands against total - * as they are allowed to block on server. - */ - - /* update # of requests on the wire to server */ - if (optype != CIFS_BLOCKING_OP) { - *credits -= 1; - server->in_flight++; - } - spin_unlock(&server->req_lock); - break; - } - } - return 0; -} - -static int -wait_for_free_request(struct TCP_Server_Info *server, const int optype) -{ - return wait_for_free_credits(server, optype, get_credits_field(server)); -} - -static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, - struct mid_q_entry **ppmidQ) -{ - if (ses->server->tcpStatus == CifsExiting) { - return -ENOENT; - } - - if (ses->server->tcpStatus == CifsNeedReconnect) { - cFYI(1, "tcp session dead - return to caller to retry"); - return -EAGAIN; - } - - if (ses->status != CifsGood) { - /* check if SMB session is bad because we are setting it up */ - if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && - (in_buf->Command != SMB_COM_NEGOTIATE)) - return -EAGAIN; - /* else ok - we are setting up session */ - } - *ppmidQ = AllocMidQEntry(in_buf, ses->server); - if (*ppmidQ == NULL) - return -ENOMEM; - spin_lock(&GlobalMid_Lock); - list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); - spin_unlock(&GlobalMid_Lock); - return 0; -} - -static int -wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) -{ - int error; - - error = wait_event_freezekillable(server->response_q, - midQ->mid_state != MID_REQUEST_SUBMITTED); - if (error < 0) - return -ERESTARTSYS; - - return 0; -} - -static int -cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, - unsigned int nvec, struct mid_q_entry **ret_mid) -{ - int rc; - struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; - struct mid_q_entry *mid; - - /* enable signing if server requires it */ - if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) - hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; - - mid = AllocMidQEntry(hdr, server); - if (mid == NULL) - return -ENOMEM; - - /* put it on the pending_mid_q */ - spin_lock(&GlobalMid_Lock); - list_add_tail(&mid->qhead, &server->pending_mid_q); - spin_unlock(&GlobalMid_Lock); - - rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); - if (rc) - delete_mid(mid); - *ret_mid = mid; - return rc; -} - -/* - * Send a SMB request and set the callback function in the mid to handle - * the result. Caller is responsible for dealing with timeouts. - */ -int -cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, - unsigned int nvec, mid_receive_t *receive, - mid_callback_t *callback, void *cbdata, bool ignore_pend) -{ - int rc; - struct mid_q_entry *mid; - - rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); - if (rc) - return rc; - - mutex_lock(&server->srv_mutex); - rc = cifs_setup_async_request(server, iov, nvec, &mid); - if (rc) { - mutex_unlock(&server->srv_mutex); - cifs_add_credits(server, 1); - wake_up(&server->request_q); - return rc; - } - - mid->receive = receive; - mid->callback = callback; - mid->callback_data = cbdata; - mid->mid_state = MID_REQUEST_SUBMITTED; - - cifs_in_send_inc(server); - rc = smb_sendv(server, iov, nvec); - cifs_in_send_dec(server); - cifs_save_when_sent(mid); - mutex_unlock(&server->srv_mutex); - - if (rc) - goto out_err; - - return rc; -out_err: - delete_mid(mid); - cifs_add_credits(server, 1); - wake_up(&server->request_q); - return rc; -} - -/* - * - * Send an SMB Request. No response info (other than return code) - * needs to be parsed. - * - * flags indicate the type of request buffer and how long to wait - * and whether to log NT STATUS code (error) before mapping it to POSIX error - * - */ -int -SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, - char *in_buf, int flags) -{ - int rc; - struct kvec iov[1]; - int resp_buf_type; - - iov[0].iov_base = in_buf; - iov[0].iov_len = get_rfc1002_length(in_buf) + 4; - flags |= CIFS_NO_RESP; - rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); - cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); - - return rc; -} - -static int -cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) -{ - int rc = 0; - - cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, - le16_to_cpu(mid->command), mid->mid, mid->mid_state); - - spin_lock(&GlobalMid_Lock); - switch (mid->mid_state) { - case MID_RESPONSE_RECEIVED: - spin_unlock(&GlobalMid_Lock); - return rc; - case MID_RETRY_NEEDED: - rc = -EAGAIN; - break; - case MID_RESPONSE_MALFORMED: - rc = -EIO; - break; - case MID_SHUTDOWN: - rc = -EHOSTDOWN; - break; - default: - list_del_init(&mid->qhead); - cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, - mid->mid, mid->mid_state); - rc = -EIO; - } - spin_unlock(&GlobalMid_Lock); - - DeleteMidQEntry(mid); - 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) -{ - 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; -} - -int -cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, - bool log_error) -{ - unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; - - dump_smb(mid->resp_buf, min_t(u32, 92, len)); - - /* convert the length into a more usable form */ - if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { - struct kvec iov; - - iov.iov_base = mid->resp_buf; - iov.iov_len = len; - /* FIXME: add code to kill session */ - if (cifs_verify_signature(&iov, 1, server, - mid->sequence_number + 1) != 0) - cERROR(1, "Unexpected SMB signature"); - } - - /* BB special case reconnect tid and uid here? */ - return map_smb_to_linux_error(mid->resp_buf, log_error); -} - -static int -cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, - unsigned int nvec, struct mid_q_entry **ret_mid) -{ - int rc; - struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; - struct mid_q_entry *mid; - - rc = allocate_mid(ses, hdr, &mid); - if (rc) - return rc; - rc = cifs_sign_smb2(iov, nvec, ses->server, &mid->sequence_number); - if (rc) - delete_mid(mid); - *ret_mid = mid; - return rc; -} - -int -SendReceive2(const unsigned int xid, struct cifs_ses *ses, - struct kvec *iov, int n_vec, int *pRespBufType /* ret */, - const int flags) -{ - int rc = 0; - int long_op; - struct mid_q_entry *midQ; - char *buf = iov[0].iov_base; - - long_op = flags & CIFS_TIMEOUT_MASK; - - *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ - - if ((ses == NULL) || (ses->server == NULL)) { - cifs_small_buf_release(buf); - cERROR(1, "Null session"); - return -EIO; - } - - if (ses->server->tcpStatus == CifsExiting) { - cifs_small_buf_release(buf); - return -ENOENT; - } - - /* - * Ensure that we do not send more than 50 overlapping requests - * to the same server. We may make this configurable later or - * use ses->maxReq. - */ - - rc = wait_for_free_request(ses->server, long_op); - if (rc) { - cifs_small_buf_release(buf); - return rc; - } - - /* - * Make sure that we sign in the same order that we send on this socket - * and avoid races inside tcp sendmsg code that could cause corruption - * of smb data. - */ - - mutex_lock(&ses->server->srv_mutex); - - rc = cifs_setup_request(ses, iov, n_vec, &midQ); - if (rc) { - mutex_unlock(&ses->server->srv_mutex); - cifs_small_buf_release(buf); - /* Update # of requests on wire to server */ - cifs_add_credits(ses->server, 1); - return rc; - } - - midQ->mid_state = MID_REQUEST_SUBMITTED; - cifs_in_send_inc(ses->server); - rc = smb_sendv(ses->server, iov, n_vec); - cifs_in_send_dec(ses->server); - cifs_save_when_sent(midQ); - - mutex_unlock(&ses->server->srv_mutex); - - if (rc < 0) { - cifs_small_buf_release(buf); - goto out; - } - - if (long_op == CIFS_ASYNC_OP) { - cifs_small_buf_release(buf); - goto out; - } - - rc = wait_for_response(ses->server, midQ); - if (rc != 0) { - send_nt_cancel(ses->server, (struct smb_hdr *)buf, midQ); - spin_lock(&GlobalMid_Lock); - if (midQ->mid_state == MID_REQUEST_SUBMITTED) { - midQ->callback = DeleteMidQEntry; - spin_unlock(&GlobalMid_Lock); - cifs_small_buf_release(buf); - cifs_add_credits(ses->server, 1); - return rc; - } - spin_unlock(&GlobalMid_Lock); - } - - cifs_small_buf_release(buf); - - rc = cifs_sync_mid_result(midQ, ses->server); - if (rc != 0) { - cifs_add_credits(ses->server, 1); - return rc; - } - - if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { - rc = -EIO; - cFYI(1, "Bad MID state?"); - goto out; - } - - buf = (char *)midQ->resp_buf; - iov[0].iov_base = buf; - iov[0].iov_len = get_rfc1002_length(buf) + 4; - if (midQ->large_buf) - *pRespBufType = CIFS_LARGE_BUFFER; - else - *pRespBufType = CIFS_SMALL_BUFFER; - - rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); - - /* mark it so buf will not be freed by delete_mid */ - if ((flags & CIFS_NO_RESP) == 0) - midQ->resp_buf = NULL; -out: - delete_mid(midQ); - cifs_add_credits(ses->server, 1); - - return rc; -} - -int -SendReceive(const unsigned int xid, struct cifs_ses *ses, - struct smb_hdr *in_buf, struct smb_hdr *out_buf, - int *pbytes_returned, const int long_op) -{ - int rc = 0; - struct mid_q_entry *midQ; - - if (ses == NULL) { - cERROR(1, "Null smb session"); - return -EIO; - } - if (ses->server == NULL) { - cERROR(1, "Null tcp session"); - return -EIO; - } - - if (ses->server->tcpStatus == CifsExiting) - return -ENOENT; - - /* Ensure that we do not send more than 50 overlapping requests - to the same server. We may make this configurable later or - use ses->maxReq */ - - if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + - MAX_CIFS_HDR_SIZE - 4) { - cERROR(1, "Illegal length, greater than maximum frame, %d", - be32_to_cpu(in_buf->smb_buf_length)); - return -EIO; - } - - rc = wait_for_free_request(ses->server, long_op); - if (rc) - return rc; - - /* make sure that we sign in the same order that we send on this socket - and avoid races inside tcp sendmsg code that could cause corruption - of smb data */ - - mutex_lock(&ses->server->srv_mutex); - - rc = allocate_mid(ses, in_buf, &midQ); - if (rc) { - mutex_unlock(&ses->server->srv_mutex); - /* Update # of requests on wire to server */ - cifs_add_credits(ses->server, 1); - return rc; - } - - rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); - if (rc) { - mutex_unlock(&ses->server->srv_mutex); - goto out; - } - - midQ->mid_state = MID_REQUEST_SUBMITTED; - - cifs_in_send_inc(ses->server); - rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); - cifs_in_send_dec(ses->server); - cifs_save_when_sent(midQ); - mutex_unlock(&ses->server->srv_mutex); - - if (rc < 0) - goto out; - - if (long_op == CIFS_ASYNC_OP) - goto out; - - rc = wait_for_response(ses->server, midQ); - if (rc != 0) { - send_nt_cancel(ses->server, in_buf, midQ); - spin_lock(&GlobalMid_Lock); - if (midQ->mid_state == MID_REQUEST_SUBMITTED) { - /* no longer considered to be "in-flight" */ - midQ->callback = DeleteMidQEntry; - spin_unlock(&GlobalMid_Lock); - cifs_add_credits(ses->server, 1); - return rc; - } - spin_unlock(&GlobalMid_Lock); - } - - rc = cifs_sync_mid_result(midQ, ses->server); - if (rc != 0) { - cifs_add_credits(ses->server, 1); - return rc; - } - - if (!midQ->resp_buf || !out_buf || - midQ->mid_state != MID_RESPONSE_RECEIVED) { - rc = -EIO; - cERROR(1, "Bad MID state?"); - goto out; - } - - *pbytes_returned = get_rfc1002_length(midQ->resp_buf); - memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); - rc = cifs_check_receive(midQ, ses->server, 0); -out: - delete_mid(midQ); - cifs_add_credits(ses->server, 1); - - return rc; -} - -/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows - blocking lock to return. */ - -static int -send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, - struct smb_hdr *in_buf, - struct smb_hdr *out_buf) -{ - int bytes_returned; - struct cifs_ses *ses = tcon->ses; - LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; - - /* We just modify the current in_buf to change - the type of lock from LOCKING_ANDX_SHARED_LOCK - or LOCKING_ANDX_EXCLUSIVE_LOCK to - LOCKING_ANDX_CANCEL_LOCK. */ - - pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; - pSMB->Timeout = 0; - pSMB->hdr.Mid = GetNextMid(ses->server); - - return SendReceive(xid, ses, in_buf, out_buf, - &bytes_returned, 0); -} - -int -SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, - struct smb_hdr *in_buf, struct smb_hdr *out_buf, - int *pbytes_returned) -{ - int rc = 0; - int rstart = 0; - struct mid_q_entry *midQ; - struct cifs_ses *ses; - - if (tcon == NULL || tcon->ses == NULL) { - cERROR(1, "Null smb session"); - return -EIO; - } - ses = tcon->ses; - - if (ses->server == NULL) { - cERROR(1, "Null tcp session"); - return -EIO; - } - - if (ses->server->tcpStatus == CifsExiting) - return -ENOENT; - - /* Ensure that we do not send more than 50 overlapping requests - to the same server. We may make this configurable later or - use ses->maxReq */ - - if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + - MAX_CIFS_HDR_SIZE - 4) { - cERROR(1, "Illegal length, greater than maximum frame, %d", - be32_to_cpu(in_buf->smb_buf_length)); - return -EIO; - } - - rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); - if (rc) - return rc; - - /* make sure that we sign in the same order that we send on this socket - and avoid races inside tcp sendmsg code that could cause corruption - of smb data */ - - mutex_lock(&ses->server->srv_mutex); - - rc = allocate_mid(ses, in_buf, &midQ); - if (rc) { - mutex_unlock(&ses->server->srv_mutex); - return rc; - } - - rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); - if (rc) { - delete_mid(midQ); - mutex_unlock(&ses->server->srv_mutex); - return rc; - } - - midQ->mid_state = MID_REQUEST_SUBMITTED; - cifs_in_send_inc(ses->server); - rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); - cifs_in_send_dec(ses->server); - cifs_save_when_sent(midQ); - mutex_unlock(&ses->server->srv_mutex); - - if (rc < 0) { - delete_mid(midQ); - return rc; - } - - /* Wait for a reply - allow signals to interrupt. */ - rc = wait_event_interruptible(ses->server->response_q, - (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || - ((ses->server->tcpStatus != CifsGood) && - (ses->server->tcpStatus != CifsNew))); - - /* Were we interrupted by a signal ? */ - if ((rc == -ERESTARTSYS) && - (midQ->mid_state == MID_REQUEST_SUBMITTED) && - ((ses->server->tcpStatus == CifsGood) || - (ses->server->tcpStatus == CifsNew))) { - - 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); - if (rc) { - delete_mid(midQ); - return rc; - } - } else { - /* Windows lock. We send a LOCKINGX_CANCEL_LOCK - to cause the blocking lock to return. */ - - rc = send_lock_cancel(xid, tcon, in_buf, out_buf); - - /* If we get -ENOLCK back the lock may have - already been removed. Don't exit in this case. */ - if (rc && rc != -ENOLCK) { - delete_mid(midQ); - return rc; - } - } - - rc = wait_for_response(ses->server, midQ); - if (rc) { - send_nt_cancel(ses->server, in_buf, midQ); - spin_lock(&GlobalMid_Lock); - if (midQ->mid_state == MID_REQUEST_SUBMITTED) { - /* no longer considered to be "in-flight" */ - midQ->callback = DeleteMidQEntry; - spin_unlock(&GlobalMid_Lock); - return rc; - } - spin_unlock(&GlobalMid_Lock); - } - - /* We got the response - restart system call. */ - rstart = 1; - } - - rc = cifs_sync_mid_result(midQ, ses->server); - if (rc != 0) - return rc; - - /* rcvd frame is ok */ - if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { - rc = -EIO; - cERROR(1, "Bad MID state?"); - goto out; - } - - *pbytes_returned = get_rfc1002_length(midQ->resp_buf); - memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); - rc = cifs_check_receive(midQ, ses->server, 0); -out: - delete_mid(midQ); - if (rstart && rc == -EACCES) - return -ERESTARTSYS; - return rc; -} |