Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 619 insertions, 0 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
new file mode 100644
index 000000000000..af13e526b150
--- /dev/null
+++ b/fs/cifs/transport.c
@@ -0,0 +1,619 @@
+/*
+ *   fs/cifs/transport.c
+ *
+ *   Copyright (C) International Business Machines  Corp., 2002,2004
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ *   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 kmem_cache_t *cifs_oplock_cachep;
+
+static struct mid_q_entry *
+AllocMidQEntry(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,SLAB_KERNEL | SLAB_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);
+                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)
+{
+        spin_lock(&GlobalMid_Lock);
+        midEntry->midState = MID_FREE;
+        list_del(&midEntry->qhead);
+        atomic_dec(&midCount);
+        spin_unlock(&GlobalMid_Lock);
+        cifs_buf_release(midEntry->resp_buf);
+        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,
+                                                       SLAB_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++;
+                        if(i > 60) {
+                                cERROR(1,
+                                   ("sends on sock %p stuck for 30 seconds",
+                                    ssocket));
+                                rc = -EAGAIN;
+                                break;
+                        }
+                        msleep(500);
+                        continue;
+                }
+                if (rc < 0) 
+                        break;
+                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;
+        }
+
+        return rc;
+}
+
+#ifdef CIFS_EXPERIMENTAL
+/* BB finish off this function, adding support for writing set of pages as iovec */
+/* and also adding support for operations that need to parse the response smb    */
+
+int
+smb_sendv(struct socket *ssocket, struct smb_hdr *smb_buffer,
+         unsigned int smb_buf_length, struct kvec * write_vector /* page list */, struct sockaddr *sin)
+{
+        int rc = 0;
+        int i = 0;
+        struct msghdr smb_msg;
+        number_of_pages += 1; /* account for SMB header */
+        struct kvec * piov  = kmalloc(number_of_pages * sizeof(struct kvec));
+        if(i=0;i<num_pages-1;i++
+        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, number_of_pages, len?);
+                if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
+                        i++;
+                        if(i > 60) {
+                                cERROR(1,
+                                   ("sends on sock %p stuck for 30 seconds",
+                                    ssocket));
+                                rc = -EAGAIN;
+                                break;
+                        }
+                        msleep(500);
+                        continue;
+                }
+                if (rc < 0) 
+                        break;
+                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;
+        }
+
+        return rc;
+}
+
+
+int
+CIFSSendRcv(const unsigned int xid, struct cifsSesInfo *ses,
+            struct smb_hdr *in_buf, struct kvec * write_vector /* page list */, int *pbytes_returned, const int long_op)
+{
+        int rc = 0;
+        unsigned long timeout = 15 * HZ;
+        struct mid_q_entry *midQ = NULL;
+
+        if (ses == NULL) {
+                cERROR(1,("Null smb session"));
+                return -EIO;
+        }
+        if(ses->server == NULL) {
+                cERROR(1,("Null tcp session"));
+                return -EIO;
+        }
+        if(pbytes_returned == NULL)
+                return -EIO;
+        else
+                *pbytes_returned = 0;
+
+  
+
+        /* 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(long_op == -1) {
+                /* 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);
+                                wait_event(ses->server->request_q,
+                                        atomic_read(&ses->server->inFlight)
+                                         < cifs_max_pending);
+                                spin_lock(&GlobalMid_Lock);
+                        } else {
+                                if(ses->server->tcpStatus == CifsExiting) {
+                                        spin_unlock(&GlobalMid_Lock);
+                                        return -ENOENT;
+                                }
+
+                        /* can not count locking commands against total since
+                           they are allowed to block on server */
+                                        
+                                if(long_op < 3) {
+                                /* update # of requests on the wire to server */
+                                        atomic_inc(&ses->server->inFlight);
+                                }
+                                spin_unlock(&GlobalMid_Lock);
+                                break;
+                        }
+                }
+        }
+        /* 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); 
+
+        if (ses->server->tcpStatus == CifsExiting) {
+                rc = -ENOENT;
+                goto cifs_out_label;
+        } else if (ses->server->tcpStatus == CifsNeedReconnect) {
+                cFYI(1,("tcp session dead - return to caller to retry"));
+                rc = -EAGAIN;
+                goto cifs_out_label;
+        } 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)) {
+                        rc = -EAGAIN;
+                        goto cifs_out_label;
+                } /* else ok - we are setting up session */
+        }
+        midQ = AllocMidQEntry(in_buf, ses);
+        if (midQ == NULL) {
+                up(&ses->server->tcpSem);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return -ENOMEM;
+        }
+
+        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);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return -EIO;
+        }
+
+        /* BB can we sign efficiently in this path? */
+        rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
+
+        midQ->midState = MID_REQUEST_SUBMITTED;
+/*      rc = smb_sendv(ses->server->ssocket, in_buf, in_buf->smb_buf_length, piovec,
+                      (struct sockaddr *) &(ses->server->addr.sockAddr));*/
+        if(rc < 0) {
+                DeleteMidQEntry(midQ);
+                up(&ses->server->tcpSem);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return rc;
+        } else
+                up(&ses->server->tcpSem);
+cifs_out_label:
+        if(midQ)
+                DeleteMidQEntry(midQ);
+                                                                                                                           
+        if(long_op < 3) {
+                atomic_dec(&ses->server->inFlight);
+                wake_up(&ses->server->request_q);
+        }
+
+        return rc;
+}
+
+
+#endif /* CIFS_EXPERIMENTAL */
+
+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;
+        }
+
+        /* 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(long_op == -1) {
+                /* 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);
+                                wait_event(ses->server->request_q,
+                                        atomic_read(&ses->server->inFlight)
+                                         < cifs_max_pending);
+                                spin_lock(&GlobalMid_Lock);
+                        } else {
+                                if(ses->server->tcpStatus == CifsExiting) {
+                                        spin_unlock(&GlobalMid_Lock);
+                                        return -ENOENT;
+                                }
+
+                        /* can not count locking commands against total since
+                           they are allowed to block on server */
+                                        
+                                if(long_op < 3) {
+                                /* update # of requests on the wire to server */
+                                        atomic_inc(&ses->server->inFlight);
+                                }
+                                spin_unlock(&GlobalMid_Lock);
+                                break;
+                        }
+                }
+        }
+        /* 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); 
+
+        if (ses->server->tcpStatus == CifsExiting) {
+                rc = -ENOENT;
+                goto out_unlock;
+        } else if (ses->server->tcpStatus == CifsNeedReconnect) {
+                cFYI(1,("tcp session dead - return to caller to retry"));
+                rc = -EAGAIN;
+                goto out_unlock;
+        } 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)) {
+                        rc = -EAGAIN;
+                        goto out_unlock;
+                } /* else ok - we are setting up session */
+        }
+        midQ = AllocMidQEntry(in_buf, ses);
+        if (midQ == NULL) {
+                up(&ses->server->tcpSem);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return -ENOMEM;
+        }
+
+        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);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return -EIO;
+        }
+
+        rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
+
+        midQ->midState = MID_REQUEST_SUBMITTED;
+        rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
+                      (struct sockaddr *) &(ses->server->addr.sockAddr));
+        if(rc < 0) {
+                DeleteMidQEntry(midQ);
+                up(&ses->server->tcpSem);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        atomic_dec(&ses->server->inFlight); 
+                        wake_up(&ses->server->request_q);
+                }
+                return rc;
+        } else
+                up(&ses->server->tcpSem);
+        if (long_op == -1)
+                goto cifs_no_response_exit;
+        else if (long_op == 2) /* writes past end of file can take looooong time */
+                timeout = 300 * HZ;
+        else if (long_op == 1)
+                timeout = 45 * HZ; /* should be greater than 
+                        servers oplock break timeout (about 43 seconds) */
+        else if (long_op > 2) {
+                timeout = MAX_SCHEDULE_TIMEOUT;
+        } else
+                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 */
+        if (signal_pending(current)) {
+                /* if signal pending do not hold up user for full smb timeout
+                but we still give response a change to complete */
+                timeout = 2 * HZ;
+        }   
+
+        /* No user interrupts in wait - wreaks havoc with performance */
+        if(timeout != MAX_SCHEDULE_TIMEOUT) {
+                timeout += jiffies;
+                wait_event(ses->server->response_q,
+                        (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
+                        time_after(jiffies, timeout) || 
+                        ((ses->server->tcpStatus != CifsGood) &&
+                         (ses->server->tcpStatus != CifsNew)));
+        } else {
+                wait_event(ses->server->response_q,
+                        (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
+                        ((ses->server->tcpStatus != CifsGood) &&
+                         (ses->server->tcpStatus != CifsNew)));
+        }
+
+        spin_lock(&GlobalMid_Lock);
+        if (midQ->resp_buf) {
+                spin_unlock(&GlobalMid_Lock);
+                receive_len = be32_to_cpu(*(__be32 *)midQ->resp_buf);
+        } else {
+                cERROR(1,("No response buffer"));
+                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);
+                /* If not lock req, update # of requests on wire to server */
+                if(long_op < 3) {
+                        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->mac_signing_key,midQ->sequence_number); /* BB fix BB */
+                                if(rc)
+                                        cFYI(1,("Unexpected signature received from server"));
+                        }
+
+                        *pbytes_returned = out_buf->smb_buf_length;
+
+                        /* BB special case reconnect tid and reconnect uid here? */
+                        rc = map_smb_to_linux_error(out_buf);
+
+                        /* 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(out_buf));
+                } else {
+                        rc = -EIO;
+                        cFYI(1,("Bad MID state? "));
+                }
+        }
+cifs_no_response_exit:
+        DeleteMidQEntry(midQ);
+
+        if(long_op < 3) {
+                atomic_dec(&ses->server->inFlight); 
+                wake_up(&ses->server->request_q);
+        }
+
+        return rc;
+
+out_unlock:
+        up(&ses->server->tcpSem);
+        /* If not lock req, update # of requests on wire to server */
+        if(long_op < 3) {
+                atomic_dec(&ses->server->inFlight); 
+                wake_up(&ses->server->request_q);
+        }
+
+        return rc;
+}