vserver 1.9.5.x5

[linux-2.6.git] / fs / cifs / misc.c

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 6bf6ee3..c79d8f7 100644 (file)
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1,7 +1,7 @@
 /*
  *   fs/cifs/misc.c
  *
- *   Copyright (C) International Business Machines  Corp., 2002,2003
+ *   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
@@ -29,6 +29,7 @@
 #include "smberr.h"
 #include "nterr.h"
 
+extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
 extern struct task_struct * oplockThread;
 
@@ -124,7 +125,7 @@ tconInfoAlloc(void)
                INIT_LIST_HEAD(&ret_buf->openFileList);
                init_MUTEX(&ret_buf->tconSem);
 #ifdef CONFIG_CIFS_STATS
-               ret_buf->stat_lock = SPIN_LOCK_UNLOCKED;
+               spin_lock_init(&ret_buf->stat_lock);
 #endif
                write_unlock(&GlobalSMBSeslock);
        }
@@ -160,8 +161,9 @@ cifs_buf_get(void)
            (struct smb_hdr *) mempool_alloc(cifs_req_poolp, SLAB_KERNEL | SLAB_NOFS);
 
        /* clear the first few header bytes */
+       /* for most paths, more is cleared in header_assemble */
        if (ret_buf) {
-               memset(ret_buf, 0, sizeof (struct smb_hdr));
+               memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
                atomic_inc(&bufAllocCount);
        }
 
@@ -173,7 +175,7 @@ cifs_buf_release(void *buf_to_free)
 {
 
        if (buf_to_free == NULL) {
-               cFYI(1, ("Null buffer passed to cifs_buf_release"));
+               /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
                return;
        }
        mempool_free(buf_to_free,cifs_req_poolp);
@@ -182,20 +184,49 @@ cifs_buf_release(void *buf_to_free)
        return;
 }
 
+struct smb_hdr *
+cifs_small_buf_get(void)
+{
+       struct smb_hdr *ret_buf = NULL;
+
+/* We could use negotiated size instead of max_msgsize - 
+   but it may be more efficient to always alloc same size 
+   albeit slightly larger than necessary and maxbuffersize 
+   defaults to this and can not be bigger */
+       ret_buf =
+           (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp, SLAB_KERNEL | SLAB_NOFS);
+       if (ret_buf) {
+       /* No need to clear memory here, cleared in header assemble */
+       /*      memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
+               atomic_inc(&smBufAllocCount);
+       }
+       return ret_buf;
+}
+
+void
+cifs_small_buf_release(void *buf_to_free)
+{
+
+       if (buf_to_free == NULL) {
+               cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
+               return;
+       }
+       mempool_free(buf_to_free,cifs_sm_req_poolp);
+
+       atomic_dec(&smBufAllocCount);
+       return;
+}
+
 void
 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
                const struct cifsTconInfo *treeCon, int word_count
-               /* length of fixed section (word count) in two byte units  */
-    )
+               /* length of fixed section (word count) in two byte units  */)
 {
-       int i;
        struct list_head* temp_item;
        struct cifsSesInfo * ses;
        char *temp = (char *) buffer;
 
-       for (i = 0; i < MAX_CIFS_HDR_SIZE; i++) {
-               temp[i] = 0;    /* BB is this needed ?? */
-       }
+       memset(temp,0,MAX_CIFS_HDR_SIZE);
 
        buffer->smb_buf_length =
            (2 * word_count) + sizeof (struct smb_hdr) -
@@ -320,7 +351,7 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length)
             ("Entering checkSMB with Length: %x, smb_buf_length: %x ",
              length, len));
        if (((unsigned int)length < 2 + sizeof (struct smb_hdr)) ||
-           (len > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4)) {
+           (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)) {
                if ((unsigned int)length < 2 + sizeof (struct smb_hdr)) {
                        cERROR(1, ("Length less than 2 + sizeof smb_hdr "));
                        if (((unsigned int)length >= sizeof (struct smb_hdr) - 1)
@@ -328,9 +359,9 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length)
                                return 0;       /* some error cases do not return wct and bcc */
 
                }
-               if (len > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4)
+               if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
                        cERROR(1,
-                              ("smb_buf_length greater than CIFS_MAX_MSGSIZE ... "));
+                              ("smb_buf_length greater than MaxBufSize"));
                cERROR(1,
                       ("bad smb detected. Illegal length. The mid=%d",
                        smb->Mid));
@@ -359,8 +390,29 @@ is_valid_oplock_break(struct smb_hdr *buf)
        struct cifsTconInfo *tcon;
        struct cifsFileInfo *netfile;
 
-       /* could add check for smb response flag 0x80 */
-       cFYI(1,("Checking for oplock break"));    
+       cFYI(1,("Checking for oplock break or dnotify response"));
+       if((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
+          (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
+               struct smb_com_transaction_change_notify_rsp * pSMBr =
+                       (struct smb_com_transaction_change_notify_rsp *)buf;
+               struct file_notify_information * pnotify;
+               __u32 data_offset = 0;
+               if(pSMBr->ByteCount > sizeof(struct file_notify_information)) {
+                       data_offset = le32_to_cpu(pSMBr->DataOffset);
+
+                       pnotify = (struct file_notify_information *)((char *)&pSMBr->hdr.Protocol
+                               + data_offset);
+                       cFYI(1,("dnotify on %s with action: 0x%x",pnotify->FileName,
+                               pnotify->Action));  /* BB removeme BB */
+                    /*   cifs_dump_mem("Received notify Data is: ",buf,sizeof(struct smb_hdr)+60); */
+                       return TRUE;
+               }
+               if(pSMBr->hdr.Status.CifsError) {
+                       cFYI(1,("notify err 0x%d",pSMBr->hdr.Status.CifsError));
+                       return TRUE;
+               }
+               return FALSE;
+       }  
        if(pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
                return FALSE;
        if(pSMB->hdr.Flags & SMBFLG_RESPONSE) {