| /* |
| * 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/wait.h> |
| #include <linux/net.h> |
| #include <linux/delay.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; |
| extern struct kmem_cache *cifs_oplock_cachep; |
| |
| static struct mid_q_entry * |
| AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
| { |
| struct mid_q_entry *temp; |
| |
| if (ses == NULL) { |
| cERROR(1, ("Null session passed in to AllocMidQEntry")); |
| return NULL; |
| } |
| if (ses->server == NULL) { |
| cERROR(1, ("Null TCP session in AllocMidQEntry")); |
| return NULL; |
| } |
| |
| temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp, |
| GFP_KERNEL | 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 = smb_buffer->Command; |
| cFYI(1, ("For smb_command %d", temp->command)); |
| /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| /* when mid allocated can be before when sent */ |
| temp->when_alloc = jiffies; |
| temp->ses = ses; |
| temp->tsk = current; |
| } |
| |
| spin_lock(&GlobalMid_Lock); |
| list_add_tail(&temp->qhead, &ses->server->pending_mid_q); |
| atomic_inc(&midCount); |
| temp->midState = MID_REQUEST_ALLOCATED; |
| spin_unlock(&GlobalMid_Lock); |
| return temp; |
| } |
| |
| static void |
| DeleteMidQEntry(struct mid_q_entry *midEntry) |
| { |
| #ifdef CONFIG_CIFS_STATS2 |
| unsigned long now; |
| #endif |
| spin_lock(&GlobalMid_Lock); |
| midEntry->midState = MID_FREE; |
| list_del(&midEntry->qhead); |
| atomic_dec(&midCount); |
| spin_unlock(&GlobalMid_Lock); |
| if (midEntry->largeBuf) |
| 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 != SMB_COM_LOCKING_ANDX)) { |
| printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", |
| 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); |
| } |
| |
| struct oplock_q_entry * |
| AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
| { |
| struct oplock_q_entry *temp; |
| if ((pinode == NULL) || (tcon == NULL)) { |
| cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
| return NULL; |
| } |
| temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, |
| GFP_KERNEL); |
| if (temp == NULL) |
| return temp; |
| else { |
| temp->pinode = pinode; |
| temp->tcon = tcon; |
| temp->netfid = fid; |
| spin_lock(&GlobalMid_Lock); |
| list_add_tail(&temp->qhead, &GlobalOplock_Q); |
| spin_unlock(&GlobalMid_Lock); |
| } |
| return temp; |
| |
| } |
| |
| void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
| { |
| spin_lock(&GlobalMid_Lock); |
| /* should we check if list empty first? */ |
| list_del(&oplockEntry->qhead); |
| spin_unlock(&GlobalMid_Lock); |
| kmem_cache_free(cifs_oplock_cachep, oplockEntry); |
| } |
| |
| int |
| smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, |
| unsigned int smb_buf_length, struct sockaddr *sin) |
| { |
| int rc = 0; |
| int i = 0; |
| struct msghdr smb_msg; |
| struct kvec iov; |
| unsigned len = smb_buf_length + 4; |
| |
| if (ssocket == NULL) |
| return -ENOTSOCK; /* BB eventually add reconnect code here */ |
| iov.iov_base = smb_buffer; |
| iov.iov_len = len; |
| |
| smb_msg.msg_name = sin; |
| smb_msg.msg_namelen = sizeof(struct sockaddr); |
| smb_msg.msg_control = NULL; |
| smb_msg.msg_controllen = 0; |
| smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| |
| /* smb header is converted in header_assemble. bcc and rest of SMB word |
| area, and byte area if necessary, is converted to littleendian in |
| cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
| Flags2 is converted in SendReceive */ |
| |
| smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
| cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
| dump_smb(smb_buffer, len); |
| |
| while (len > 0) { |
| rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); |
| if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| i++; |
| /* smaller timeout here than send2 since smaller size */ |
| /* Although it may not be required, this also is smaller |
| oplock break time */ |
| if (i > 12) { |
| cERROR(1, |
| ("sends on sock %p stuck for 7 seconds", |
| ssocket)); |
| rc = -EAGAIN; |
| break; |
| } |
| msleep(1 << i); |
| continue; |
| } |
| if (rc < 0) |
| break; |
| else |
| i = 0; /* reset i after each successful send */ |
| iov.iov_base += rc; |
| iov.iov_len -= rc; |
| len -= rc; |
| } |
| |
| if (rc < 0) { |
| 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. */ |
| smb_buffer->smb_buf_length = smb_buf_length; |
| |
| return rc; |
| } |
| |
| static int |
| smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec, |
| struct sockaddr *sin) |
| { |
| int rc = 0; |
| int i = 0; |
| struct msghdr smb_msg; |
| struct smb_hdr *smb_buffer = iov[0].iov_base; |
| unsigned int len = iov[0].iov_len; |
| unsigned int total_len; |
| int first_vec = 0; |
| unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
| |
| if (ssocket == NULL) |
| return -ENOTSOCK; /* BB eventually add reconnect code here */ |
| |
| smb_msg.msg_name = sin; |
| smb_msg.msg_namelen = sizeof(struct sockaddr); |
| smb_msg.msg_control = NULL; |
| smb_msg.msg_controllen = 0; |
| smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| |
| /* smb header is converted in header_assemble. bcc and rest of SMB word |
| area, and byte area if necessary, is converted to littleendian in |
| cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
| Flags2 is converted in SendReceive */ |
| |
| |
| total_len = 0; |
| for (i = 0; i < n_vec; i++) |
| total_len += iov[i].iov_len; |
| |
| smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
| cFYI(1, ("Sending smb: total_len %d", total_len)); |
| dump_smb(smb_buffer, len); |
| |
| 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 (i >= 14) { |
| 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) { |
| WARN_ON(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 (rc < 0) { |
| 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. */ |
| smb_buffer->smb_buf_length = smb_buf_length; |
| |
| return rc; |
| } |
| |
| static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
| { |
| if (long_op == CIFS_ASYNC_OP) { |
| /* oplock breaks must not be held up */ |
| atomic_inc(&ses->server->inFlight); |
| } else { |
| spin_lock(&GlobalMid_Lock); |
| while (1) { |
| if (atomic_read(&ses->server->inFlight) >= |
| cifs_max_pending){ |
| spin_unlock(&GlobalMid_Lock); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_inc(&ses->server->num_waiters); |
| #endif |
| wait_event(ses->server->request_q, |
| atomic_read(&ses->server->inFlight) |
| < cifs_max_pending); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_dec(&ses->server->num_waiters); |
| #endif |
| spin_lock(&GlobalMid_Lock); |
| } else { |
| if (ses->server->tcpStatus == CifsExiting) { |
| spin_unlock(&GlobalMid_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 (long_op != CIFS_BLOCKING_OP) |
| atomic_inc(&ses->server->inFlight); |
| spin_unlock(&GlobalMid_Lock); |
| break; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
| struct mid_q_entry **ppmidQ) |
| { |
| if (ses->server->tcpStatus == CifsExiting) { |
| return -ENOENT; |
| } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
| cFYI(1, ("tcp session dead - return to caller to retry")); |
| return -EAGAIN; |
| } else 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); |
| if (*ppmidQ == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static int wait_for_response(struct cifsSesInfo *ses, |
| struct mid_q_entry *midQ, |
| unsigned long timeout, |
| unsigned long time_to_wait) |
| { |
| unsigned long curr_timeout; |
| |
| for (;;) { |
| curr_timeout = timeout + jiffies; |
| wait_event(ses->server->response_q, |
| (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
| time_after(jiffies, curr_timeout) || |
| ((ses->server->tcpStatus != CifsGood) && |
| (ses->server->tcpStatus != CifsNew))); |
| |
| if (time_after(jiffies, curr_timeout) && |
| (midQ->midState == MID_REQUEST_SUBMITTED) && |
| ((ses->server->tcpStatus == CifsGood) || |
| (ses->server->tcpStatus == CifsNew))) { |
| |
| unsigned long lrt; |
| |
| /* We timed out. Is the server still |
| sending replies ? */ |
| spin_lock(&GlobalMid_Lock); |
| lrt = ses->server->lstrp; |
| spin_unlock(&GlobalMid_Lock); |
| |
| /* Calculate time_to_wait past last receive time. |
| Although we prefer not to time out if the |
| server is still responding - we will time |
| out if the server takes more than 15 (or 45 |
| or 180) seconds to respond to this request |
| and has not responded to any request from |
| other threads on the client within 10 seconds */ |
| lrt += time_to_wait; |
| if (time_after(jiffies, lrt)) { |
| /* No replies for time_to_wait. */ |
| cERROR(1, ("server not responding")); |
| return -1; |
| } |
| } else { |
| return 0; |
| } |
| } |
| } |
| |
| |
| /* |
| * |
| * 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 cifsSesInfo *ses, |
| struct smb_hdr *in_buf, int flags) |
| { |
| int rc; |
| struct kvec iov[1]; |
| int resp_buf_type; |
| |
| iov[0].iov_base = (char *)in_buf; |
| iov[0].iov_len = in_buf->smb_buf_length + 4; |
| flags |= CIFS_NO_RESP; |
| rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| cFYI(1, ("SendRcvNoR flags %d rc %d", flags, rc)); |
| #endif |
| return rc; |
| } |
| |
| int |
| SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
| struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
| const int flags) |
| { |
| int rc = 0; |
| int long_op; |
| unsigned int receive_len; |
| unsigned long timeout; |
| struct mid_q_entry *midQ; |
| struct smb_hdr *in_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(in_buf); |
| cERROR(1, ("Null session")); |
| return -EIO; |
| } |
| |
| if (ses->server->tcpStatus == CifsExiting) { |
| cifs_small_buf_release(in_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, long_op); |
| if (rc) { |
| cifs_small_buf_release(in_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 */ |
| |
| down(&ses->server->tcpSem); |
| |
| rc = allocate_mid(ses, in_buf, &midQ); |
| if (rc) { |
| up(&ses->server->tcpSem); |
| cifs_small_buf_release(in_buf); |
| /* Update # of requests on wire to server */ |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| return rc; |
| } |
| rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
| |
| midQ->midState = MID_REQUEST_SUBMITTED; |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_inc(&ses->server->inSend); |
| #endif |
| rc = smb_send2(ses->server->ssocket, iov, n_vec, |
| (struct sockaddr *) &(ses->server->addr.sockAddr)); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_dec(&ses->server->inSend); |
| midQ->when_sent = jiffies; |
| #endif |
| |
| up(&ses->server->tcpSem); |
| cifs_small_buf_release(in_buf); |
| |
| if (rc < 0) |
| goto out; |
| |
| if (long_op == CIFS_STD_OP) |
| timeout = 15 * HZ; |
| else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ |
| timeout = 180 * HZ; |
| else if (long_op == CIFS_LONG_OP) |
| timeout = 45 * HZ; /* should be greater than |
| servers oplock break timeout (about 43 seconds) */ |
| else if (long_op == CIFS_ASYNC_OP) |
| goto out; |
| else if (long_op == CIFS_BLOCKING_OP) |
| timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ |
| else { |
| cERROR(1, ("unknown timeout flag %d", long_op)); |
| rc = -EIO; |
| goto out; |
| } |
| |
| /* wait for 15 seconds or until woken up due to response arriving or |
| due to last connection to this server being unmounted */ |
| if (signal_pending(current)) { |
| /* if signal pending do not hold up user for full smb timeout |
| but we still give response a chance to complete */ |
| timeout = 2 * HZ; |
| } |
| |
| /* No user interrupts in wait - wreaks havoc with performance */ |
| wait_for_response(ses, midQ, timeout, 10 * HZ); |
| |
| spin_lock(&GlobalMid_Lock); |
| if (midQ->resp_buf) { |
| spin_unlock(&GlobalMid_Lock); |
| receive_len = midQ->resp_buf->smb_buf_length; |
| } else { |
| cERROR(1, ("No response to cmd %d mid %d", |
| midQ->command, midQ->mid)); |
| if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| if (ses->server->tcpStatus == CifsExiting) |
| rc = -EHOSTDOWN; |
| else { |
| ses->server->tcpStatus = CifsNeedReconnect; |
| midQ->midState = MID_RETRY_NEEDED; |
| } |
| } |
| |
| if (rc != -EHOSTDOWN) { |
| if (midQ->midState == MID_RETRY_NEEDED) { |
| rc = -EAGAIN; |
| cFYI(1, ("marking request for retry")); |
| } else { |
| rc = -EIO; |
| } |
| } |
| spin_unlock(&GlobalMid_Lock); |
| DeleteMidQEntry(midQ); |
| /* Update # of requests on wire to server */ |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| return rc; |
| } |
| |
| if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| receive_len, xid)); |
| rc = -EIO; |
| } else { /* rcvd frame is ok */ |
| if (midQ->resp_buf && |
| (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| |
| iov[0].iov_base = (char *)midQ->resp_buf; |
| if (midQ->largeBuf) |
| *pRespBufType = CIFS_LARGE_BUFFER; |
| else |
| *pRespBufType = CIFS_SMALL_BUFFER; |
| iov[0].iov_len = receive_len + 4; |
| |
| dump_smb(midQ->resp_buf, 80); |
| /* convert the length into a more usable form */ |
| if ((receive_len > 24) && |
| (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| SECMODE_SIGN_ENABLED))) { |
| rc = cifs_verify_signature(midQ->resp_buf, |
| &ses->server->mac_signing_key, |
| midQ->sequence_number+1); |
| if (rc) { |
| cERROR(1, ("Unexpected SMB signature")); |
| /* BB FIXME add code to kill session */ |
| } |
| } |
| |
| /* BB special case reconnect tid and uid here? */ |
| rc = map_smb_to_linux_error(midQ->resp_buf, |
| flags & CIFS_LOG_ERROR); |
| |
| /* convert ByteCount if necessary */ |
| if (receive_len >= sizeof(struct smb_hdr) - 4 |
| /* do not count RFC1001 header */ + |
| (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
| BCC(midQ->resp_buf) = |
| le16_to_cpu(BCC_LE(midQ->resp_buf)); |
| if ((flags & CIFS_NO_RESP) == 0) |
| midQ->resp_buf = NULL; /* mark it so buf will |
| not be freed by |
| DeleteMidQEntry */ |
| } else { |
| rc = -EIO; |
| cFYI(1, ("Bad MID state?")); |
| } |
| } |
| |
| out: |
| DeleteMidQEntry(midQ); |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| |
| return rc; |
| } |
| |
| int |
| SendReceive(const unsigned int xid, struct cifsSesInfo *ses, |
| struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| int *pbytes_returned, const int long_op) |
| { |
| int rc = 0; |
| unsigned int receive_len; |
| unsigned long timeout; |
| 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 */ |
| |
| rc = wait_for_free_request(ses, 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 */ |
| |
| down(&ses->server->tcpSem); |
| |
| rc = allocate_mid(ses, in_buf, &midQ); |
| if (rc) { |
| up(&ses->server->tcpSem); |
| /* Update # of requests on wire to server */ |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| return rc; |
| } |
| |
| if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| cERROR(1, ("Illegal length, greater than maximum frame, %d", |
| in_buf->smb_buf_length)); |
| DeleteMidQEntry(midQ); |
| up(&ses->server->tcpSem); |
| /* Update # of requests on wire to server */ |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| return -EIO; |
| } |
| |
| rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| |
| midQ->midState = MID_REQUEST_SUBMITTED; |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_inc(&ses->server->inSend); |
| #endif |
| rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| (struct sockaddr *) &(ses->server->addr.sockAddr)); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_dec(&ses->server->inSend); |
| midQ->when_sent = jiffies; |
| #endif |
| up(&ses->server->tcpSem); |
| |
| if (rc < 0) |
| goto out; |
| |
| if (long_op == CIFS_STD_OP) |
| timeout = 15 * HZ; |
| /* wait for 15 seconds or until woken up due to response arriving or |
| due to last connection to this server being unmounted */ |
| else if (long_op == CIFS_ASYNC_OP) |
| goto out; |
| else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
| timeout = 180 * HZ; |
| else if (long_op == CIFS_LONG_OP) |
| timeout = 45 * HZ; /* should be greater than |
| servers oplock break timeout (about 43 seconds) */ |
| else if (long_op == CIFS_BLOCKING_OP) |
| timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ |
| else { |
| cERROR(1, ("unknown timeout flag %d", long_op)); |
| rc = -EIO; |
| goto out; |
| } |
| |
| if (signal_pending(current)) { |
| /* if signal pending do not hold up user for full smb timeout |
| but we still give response a chance to complete */ |
| timeout = 2 * HZ; |
| } |
| |
| /* No user interrupts in wait - wreaks havoc with performance */ |
| wait_for_response(ses, midQ, timeout, 10 * HZ); |
| |
| spin_lock(&GlobalMid_Lock); |
| if (midQ->resp_buf) { |
| spin_unlock(&GlobalMid_Lock); |
| receive_len = midQ->resp_buf->smb_buf_length; |
| } else { |
| cERROR(1, ("No response for cmd %d mid %d", |
| midQ->command, midQ->mid)); |
| if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| if (ses->server->tcpStatus == CifsExiting) |
| rc = -EHOSTDOWN; |
| else { |
| ses->server->tcpStatus = CifsNeedReconnect; |
| midQ->midState = MID_RETRY_NEEDED; |
| } |
| } |
| |
| if (rc != -EHOSTDOWN) { |
| if (midQ->midState == MID_RETRY_NEEDED) { |
| rc = -EAGAIN; |
| cFYI(1, ("marking request for retry")); |
| } else { |
| rc = -EIO; |
| } |
| } |
| spin_unlock(&GlobalMid_Lock); |
| DeleteMidQEntry(midQ); |
| /* Update # of requests on wire to server */ |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| return rc; |
| } |
| |
| if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| receive_len, xid)); |
| rc = -EIO; |
| } else { /* rcvd frame is ok */ |
| |
| if (midQ->resp_buf && out_buf |
| && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| out_buf->smb_buf_length = receive_len; |
| memcpy((char *)out_buf + 4, |
| (char *)midQ->resp_buf + 4, |
| receive_len); |
| |
| dump_smb(out_buf, 92); |
| /* convert the length into a more usable form */ |
| if ((receive_len > 24) && |
| (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| SECMODE_SIGN_ENABLED))) { |
| rc = cifs_verify_signature(out_buf, |
| &ses->server->mac_signing_key, |
| midQ->sequence_number+1); |
| if (rc) { |
| cERROR(1, ("Unexpected SMB signature")); |
| /* BB FIXME add code to kill session */ |
| } |
| } |
| |
| *pbytes_returned = out_buf->smb_buf_length; |
| |
| /* BB special case reconnect tid and uid here? */ |
| rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
| |
| /* convert ByteCount if necessary */ |
| if (receive_len >= sizeof(struct smb_hdr) - 4 |
| /* do not count RFC1001 header */ + |
| (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| } else { |
| rc = -EIO; |
| cERROR(1, ("Bad MID state?")); |
| } |
| } |
| |
| out: |
| DeleteMidQEntry(midQ); |
| atomic_dec(&ses->server->inFlight); |
| wake_up(&ses->server->request_q); |
| |
| return rc; |
| } |
| |
| /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
| |
| static int |
| send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, |
| struct mid_q_entry *midQ) |
| { |
| int rc = 0; |
| struct cifsSesInfo *ses = tcon->ses; |
| __u16 mid = in_buf->Mid; |
| |
| header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); |
| in_buf->Mid = mid; |
| down(&ses->server->tcpSem); |
| rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| if (rc) { |
| up(&ses->server->tcpSem); |
| return rc; |
| } |
| rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| (struct sockaddr *) &(ses->server->addr.sockAddr)); |
| up(&ses->server->tcpSem); |
| 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 cifsTconInfo *tcon, |
| struct smb_hdr *in_buf, |
| struct smb_hdr *out_buf) |
| { |
| int bytes_returned; |
| struct cifsSesInfo *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, CIFS_STD_OP); |
| } |
| |
| int |
| SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, |
| struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| int *pbytes_returned) |
| { |
| int rc = 0; |
| int rstart = 0; |
| unsigned int receive_len; |
| struct mid_q_entry *midQ; |
| struct cifsSesInfo *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 */ |
| |
| rc = wait_for_free_request(ses, 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 */ |
| |
| down(&ses->server->tcpSem); |
| |
| rc = allocate_mid(ses, in_buf, &midQ); |
| if (rc) { |
| up(&ses->server->tcpSem); |
| return rc; |
| } |
| |
| if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| up(&ses->server->tcpSem); |
| cERROR(1, ("Illegal length, greater than maximum frame, %d", |
| in_buf->smb_buf_length)); |
| DeleteMidQEntry(midQ); |
| return -EIO; |
| } |
| |
| rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| |
| midQ->midState = MID_REQUEST_SUBMITTED; |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_inc(&ses->server->inSend); |
| #endif |
| rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| (struct sockaddr *) &(ses->server->addr.sockAddr)); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_dec(&ses->server->inSend); |
| midQ->when_sent = jiffies; |
| #endif |
| up(&ses->server->tcpSem); |
| |
| if (rc < 0) { |
| DeleteMidQEntry(midQ); |
| return rc; |
| } |
| |
| /* Wait for a reply - allow signals to interrupt. */ |
| rc = wait_event_interruptible(ses->server->response_q, |
| (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
| ((ses->server->tcpStatus != CifsGood) && |
| (ses->server->tcpStatus != CifsNew))); |
| |
| /* Were we interrupted by a signal ? */ |
| if ((rc == -ERESTARTSYS) && |
| (midQ->midState == 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(tcon, in_buf, midQ); |
| if (rc) { |
| DeleteMidQEntry(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) { |
| DeleteMidQEntry(midQ); |
| return rc; |
| } |
| } |
| |
| /* Wait 5 seconds for the response. */ |
| if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
| /* We got the response - restart system call. */ |
| rstart = 1; |
| } |
| } |
| |
| spin_lock(&GlobalMid_Lock); |
| if (midQ->resp_buf) { |
| spin_unlock(&GlobalMid_Lock); |
| receive_len = midQ->resp_buf->smb_buf_length; |
| } else { |
| cERROR(1, ("No response for cmd %d mid %d", |
| midQ->command, midQ->mid)); |
| if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| if (ses->server->tcpStatus == CifsExiting) |
| rc = -EHOSTDOWN; |
| else { |
| ses->server->tcpStatus = CifsNeedReconnect; |
| midQ->midState = MID_RETRY_NEEDED; |
| } |
| } |
| |
| if (rc != -EHOSTDOWN) { |
| if (midQ->midState == MID_RETRY_NEEDED) { |
| rc = -EAGAIN; |
| cFYI(1, ("marking request for retry")); |
| } else { |
| rc = -EIO; |
| } |
| } |
| spin_unlock(&GlobalMid_Lock); |
| DeleteMidQEntry(midQ); |
| return rc; |
| } |
| |
| if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| receive_len, xid)); |
| rc = -EIO; |
| } else { /* rcvd frame is ok */ |
| |
| if (midQ->resp_buf && out_buf |
| && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| out_buf->smb_buf_length = receive_len; |
| memcpy((char *)out_buf + 4, |
| (char *)midQ->resp_buf + 4, |
| receive_len); |
| |
| dump_smb(out_buf, 92); |
| /* convert the length into a more usable form */ |
| if ((receive_len > 24) && |
| (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| SECMODE_SIGN_ENABLED))) { |
| rc = cifs_verify_signature(out_buf, |
| &ses->server->mac_signing_key, |
| midQ->sequence_number+1); |
| if (rc) { |
| cERROR(1, ("Unexpected SMB signature")); |
| /* BB FIXME add code to kill session */ |
| } |
| } |
| |
| *pbytes_returned = out_buf->smb_buf_length; |
| |
| /* BB special case reconnect tid and uid here? */ |
| rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
| |
| /* convert ByteCount if necessary */ |
| if (receive_len >= sizeof(struct smb_hdr) - 4 |
| /* do not count RFC1001 header */ + |
| (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| } else { |
| rc = -EIO; |
| cERROR(1, ("Bad MID state?")); |
| } |
| } |
| DeleteMidQEntry(midQ); |
| if (rstart && rc == -EACCES) |
| return -ERESTARTSYS; |
| return rc; |
| } |