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, 913 insertions, 0 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
new file mode 100644
index 000000000000..5082fce3c566
--- /dev/null
+++ b/fs/cifs/cifsfs.c
@@ -0,0 +1,913 @@
+/*
+ *   fs/cifs/cifsfs.c
+ *
+ *   Copyright (C) International Business Machines  Corp., 2002,2004
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ *   Common Internet FileSystem (CIFS) client
+ *
+ *   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
+ */
+
+/* Note that BB means BUGBUG (ie something to fix eventually) */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/seq_file.h>
+#include <linux/vfs.h>
+#include <linux/mempool.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#define DECLARE_GLOBALS_HERE
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include <linux/mm.h>
+#define CIFS_MAGIC_NUMBER 0xFF534D42	/* the first four bytes of SMB PDUs */
+
+#ifdef CONFIG_CIFS_QUOTA
+static struct quotactl_ops cifs_quotactl_ops;
+#endif
+
+int cifsFYI = 0;
+int cifsERROR = 1;
+int traceSMB = 0;
+unsigned int oplockEnabled = 1;
+unsigned int experimEnabled = 0;
+unsigned int linuxExtEnabled = 1;
+unsigned int lookupCacheEnabled = 1;
+unsigned int multiuser_mount = 0;
+unsigned int extended_security = 0;
+unsigned int ntlmv2_support = 0;
+unsigned int sign_CIFS_PDUs = 1;
+extern struct task_struct * oplockThread; /* remove sparse warning */
+struct task_struct * oplockThread = NULL;
+unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
+module_param(CIFSMaxBufSize, int, 0);
+MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
+unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
+module_param(cifs_min_rcv, int, 0);
+MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
+unsigned int cifs_min_small = 30;
+module_param(cifs_min_small, int, 0);
+MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
+unsigned int cifs_max_pending = CIFS_MAX_REQ;
+module_param(cifs_max_pending, int, 0);
+MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
+
+static DECLARE_COMPLETION(cifs_oplock_exited);
+
+extern mempool_t *cifs_sm_req_poolp;
+extern mempool_t *cifs_req_poolp;
+extern mempool_t *cifs_mid_poolp;
+
+extern kmem_cache_t *cifs_oplock_cachep;
+
+static int
+cifs_read_super(struct super_block *sb, void *data,
+		const char *devname, int silent)
+{
+	struct inode *inode;
+	struct cifs_sb_info *cifs_sb;
+	int rc = 0;
+
+	sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
+	sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
+	cifs_sb = CIFS_SB(sb);
+	if(cifs_sb == NULL)
+		return -ENOMEM;
+	else
+		memset(cifs_sb,0,sizeof(struct cifs_sb_info));
+	
+
+	rc = cifs_mount(sb, cifs_sb, data, devname);
+
+	if (rc) {
+		if (!silent)
+			cERROR(1,
+			       ("cifs_mount failed w/return code = %d", rc));
+		goto out_mount_failed;
+	}
+
+	sb->s_magic = CIFS_MAGIC_NUMBER;
+	sb->s_op = &cifs_super_ops;
+/*	if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
+	    sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
+#ifdef CONFIG_CIFS_QUOTA
+	sb->s_qcop = &cifs_quotactl_ops;
+#endif
+	sb->s_blocksize = CIFS_MAX_MSGSIZE;
+	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
+	inode = iget(sb, ROOT_I);
+
+	if (!inode) {
+		rc = -ENOMEM;
+		goto out_no_root;
+	}
+
+	sb->s_root = d_alloc_root(inode);
+
+	if (!sb->s_root) {
+		rc = -ENOMEM;
+		goto out_no_root;
+	}
+
+	return 0;
+
+out_no_root:
+	cERROR(1, ("cifs_read_super: get root inode failed"));
+	if (inode)
+		iput(inode);
+
+out_mount_failed:
+	if(cifs_sb) {
+		if(cifs_sb->local_nls)
+			unload_nls(cifs_sb->local_nls);	
+		kfree(cifs_sb);
+	}
+	return rc;
+}
+
+static void
+cifs_put_super(struct super_block *sb)
+{
+	int rc = 0;
+	struct cifs_sb_info *cifs_sb;
+
+	cFYI(1, ("In cifs_put_super"));
+	cifs_sb = CIFS_SB(sb);
+	if(cifs_sb == NULL) {
+		cFYI(1,("Empty cifs superblock info passed to unmount"));
+		return;
+	}
+	rc = cifs_umount(sb, cifs_sb); 
+	if (rc) {
+		cERROR(1, ("cifs_umount failed with return code %d", rc));
+	}
+	unload_nls(cifs_sb->local_nls);
+	kfree(cifs_sb);
+	return;
+}
+
+static int
+cifs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+	int xid, rc = -EOPNOTSUPP;
+	struct cifs_sb_info *cifs_sb;
+	struct cifsTconInfo *pTcon;
+
+	xid = GetXid();
+
+	cifs_sb = CIFS_SB(sb);
+	pTcon = cifs_sb->tcon;
+
+	buf->f_type = CIFS_MAGIC_NUMBER;
+
+	/* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
+	buf->f_namelen = PATH_MAX;	/* PATH_MAX may be too long - it would presumably
+					   be length of total path, note that some servers may be 
+					   able to support more than this, but best to be safe
+					   since Win2k and others can not handle very long filenames */
+	buf->f_files = 0;	/* undefined */
+	buf->f_ffree = 0;	/* unlimited */
+
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+/* BB we could add a second check for a QFS Unix capability bit */
+    if (pTcon->ses->capabilities & CAP_UNIX)
+	    rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf, cifs_sb->local_nls);
+
+    /* Only need to call the old QFSInfo if failed
+    on newer one */
+    if(rc)
+#endif /* CIFS_EXPERIMENTAL */
+	rc = CIFSSMBQFSInfo(xid, pTcon, buf, cifs_sb->local_nls);
+
+	/*     
+	   int f_type;
+	   __fsid_t f_fsid;
+	   int f_namelen;  */
+	/* BB get from info put in tcon struct at mount time with call to QFSAttrInfo */
+	FreeXid(xid);
+	return 0;		/* always return success? what if volume is no longer available? */
+}
+
+static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
+{
+	struct cifs_sb_info *cifs_sb;
+
+	cifs_sb = CIFS_SB(inode->i_sb);
+
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
+		return 0;
+	} else /* file mode might have been restricted at mount time 
+		on the client (above and beyond ACL on servers) for  
+		servers which do not support setting and viewing mode bits,
+		so allowing client to check permissions is useful */ 
+		return generic_permission(inode, mask, NULL);
+}
+
+static kmem_cache_t *cifs_inode_cachep;
+static kmem_cache_t *cifs_req_cachep;
+static kmem_cache_t *cifs_mid_cachep;
+kmem_cache_t *cifs_oplock_cachep;
+static kmem_cache_t *cifs_sm_req_cachep;
+mempool_t *cifs_sm_req_poolp;
+mempool_t *cifs_req_poolp;
+mempool_t *cifs_mid_poolp;
+
+static struct inode *
+cifs_alloc_inode(struct super_block *sb)
+{
+	struct cifsInodeInfo *cifs_inode;
+	cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
+	if (!cifs_inode)
+		return NULL;
+	cifs_inode->cifsAttrs = 0x20;	/* default */
+	atomic_set(&cifs_inode->inUse, 0);
+	cifs_inode->time = 0;
+	/* Until the file is open and we have gotten oplock
+	info back from the server, can not assume caching of
+	file data or metadata */
+	cifs_inode->clientCanCacheRead = FALSE;
+	cifs_inode->clientCanCacheAll = FALSE;
+	cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
+	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
+
+	INIT_LIST_HEAD(&cifs_inode->openFileList);
+	return &cifs_inode->vfs_inode;
+}
+
+static void
+cifs_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
+}
+
+/*
+ * cifs_show_options() is for displaying mount options in /proc/mounts.
+ * Not all settable options are displayed but most of the important
+ * ones are.
+ */
+static int
+cifs_show_options(struct seq_file *s, struct vfsmount *m)
+{
+	struct cifs_sb_info *cifs_sb;
+
+	cifs_sb = CIFS_SB(m->mnt_sb);
+
+	if (cifs_sb) {
+		if (cifs_sb->tcon) {
+			seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
+			if (cifs_sb->tcon->ses) {
+				if (cifs_sb->tcon->ses->userName)
+					seq_printf(s, ",username=%s",
+					   cifs_sb->tcon->ses->userName);
+				if(cifs_sb->tcon->ses->domainName)
+					seq_printf(s, ",domain=%s",
+					   cifs_sb->tcon->ses->domainName);
+			}
+		}
+		seq_printf(s, ",rsize=%d",cifs_sb->rsize);
+		seq_printf(s, ",wsize=%d",cifs_sb->wsize);
+	}
+	return 0;
+}
+
+#ifdef CONFIG_CIFS_QUOTA
+int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
+		struct fs_disk_quota * pdquota)
+{
+	int xid;
+	int rc = 0;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifsTconInfo *pTcon;
+	
+	if(cifs_sb)
+		pTcon = cifs_sb->tcon;
+	else
+		return -EIO;
+
+
+	xid = GetXid();
+	if(pTcon) {
+		cFYI(1,("set type: 0x%x id: %d",quota_type,qid));		
+	} else {
+		return -EIO;
+	}
+
+	FreeXid(xid);
+	return rc;
+}
+
+int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
+                struct fs_disk_quota * pdquota)
+{
+	int xid;
+	int rc = 0;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifsTconInfo *pTcon;
+
+	if(cifs_sb)
+		pTcon = cifs_sb->tcon;
+	else
+		return -EIO;
+
+	xid = GetXid();
+	if(pTcon) {
+                cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
+	} else {
+		rc = -EIO;
+	}
+
+	FreeXid(xid);
+	return rc;
+}
+
+int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
+{
+	int xid; 
+	int rc = 0;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifsTconInfo *pTcon;
+
+	if(cifs_sb)
+		pTcon = cifs_sb->tcon;
+	else
+		return -EIO;
+
+	xid = GetXid();
+	if(pTcon) {
+                cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
+	} else {
+		rc = -EIO;
+	}
+
+	FreeXid(xid);
+	return rc;
+}
+
+int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
+{
+	int xid;
+	int rc = 0;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifsTconInfo *pTcon;
+
+	if(cifs_sb) {
+		pTcon = cifs_sb->tcon;
+	} else {
+		return -EIO;
+	}
+	xid = GetXid();
+	if(pTcon) {
+		cFYI(1,("pqstats %p",qstats));		
+	} else {
+		rc = -EIO;
+	}
+
+	FreeXid(xid);
+	return rc;
+}
+
+static struct quotactl_ops cifs_quotactl_ops = {
+	.set_xquota	= cifs_xquota_set,
+	.get_xquota	= cifs_xquota_set,
+	.set_xstate	= cifs_xstate_set,
+	.get_xstate	= cifs_xstate_get,
+};
+#endif
+
+static int cifs_remount(struct super_block *sb, int *flags, char *data)
+{
+	*flags |= MS_NODIRATIME;
+	return 0;
+}
+
+struct super_operations cifs_super_ops = {
+	.read_inode = cifs_read_inode,
+	.put_super = cifs_put_super,
+	.statfs = cifs_statfs,
+	.alloc_inode = cifs_alloc_inode,
+	.destroy_inode = cifs_destroy_inode,
+/*	.drop_inode	    = generic_delete_inode, 
+	.delete_inode	= cifs_delete_inode,  *//* Do not need the above two functions     
+   unless later we add lazy close of inodes or unless the kernel forgets to call
+   us with the same number of releases (closes) as opens */
+	.show_options = cifs_show_options,
+/*    .umount_begin   = cifs_umount_begin, *//* consider adding in the future */
+	.remount_fs = cifs_remount,
+};
+
+static struct super_block *
+cifs_get_sb(struct file_system_type *fs_type,
+	    int flags, const char *dev_name, void *data)
+{
+	int rc;
+	struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
+
+	cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
+
+	if (IS_ERR(sb))
+		return sb;
+
+	sb->s_flags = flags;
+
+	rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
+	if (rc) {
+		up_write(&sb->s_umount);
+		deactivate_super(sb);
+		return ERR_PTR(rc);
+	}
+	sb->s_flags |= MS_ACTIVE;
+	return sb;
+}
+
+static ssize_t
+cifs_read_wrapper(struct file * file, char __user *read_data, size_t read_size,
+          loff_t * poffset)
+{
+	if(file->f_dentry == NULL)
+		return -EIO;
+	else if(file->f_dentry->d_inode == NULL)
+		return -EIO;
+
+	cFYI(1,("In read_wrapper size %zd at %lld",read_size,*poffset));
+
+	if(CIFS_I(file->f_dentry->d_inode)->clientCanCacheRead) {
+		return generic_file_read(file,read_data,read_size,poffset);
+	} else {
+		/* BB do we need to lock inode from here until after invalidate? */
+/*		if(file->f_dentry->d_inode->i_mapping) {
+			filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
+			filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
+		}*/
+/*		cifs_revalidate(file->f_dentry);*/ /* BB fixme */
+
+		/* BB we should make timer configurable - perhaps 
+		   by simply calling cifs_revalidate here */
+		/* invalidate_remote_inode(file->f_dentry->d_inode);*/
+		return generic_file_read(file,read_data,read_size,poffset);
+	}
+}
+
+static ssize_t
+cifs_write_wrapper(struct file * file, const char __user *write_data,
+           size_t write_size, loff_t * poffset) 
+{
+	ssize_t written;
+
+	if(file->f_dentry == NULL)
+		return -EIO;
+	else if(file->f_dentry->d_inode == NULL)
+		return -EIO;
+
+	cFYI(1,("In write_wrapper size %zd at %lld",write_size,*poffset));
+
+	written = generic_file_write(file,write_data,write_size,poffset);
+	if(!CIFS_I(file->f_dentry->d_inode)->clientCanCacheAll)  {
+		if(file->f_dentry->d_inode->i_mapping) {
+			filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
+		}
+	}
+	return written;
+}
+
+
+static struct file_system_type cifs_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "cifs",
+	.get_sb = cifs_get_sb,
+	.kill_sb = kill_anon_super,
+	/*  .fs_flags */
+};
+struct inode_operations cifs_dir_inode_ops = {
+	.create = cifs_create,
+	.lookup = cifs_lookup,
+	.getattr = cifs_getattr,
+	.unlink = cifs_unlink,
+	.link = cifs_hardlink,
+	.mkdir = cifs_mkdir,
+	.rmdir = cifs_rmdir,
+	.rename = cifs_rename,
+	.permission = cifs_permission,
+/*	revalidate:cifs_revalidate,   */
+	.setattr = cifs_setattr,
+	.symlink = cifs_symlink,
+	.mknod   = cifs_mknod,
+#ifdef CONFIG_CIFS_XATTR
+	.setxattr = cifs_setxattr,
+	.getxattr = cifs_getxattr,
+	.listxattr = cifs_listxattr,
+	.removexattr = cifs_removexattr,
+#endif
+};
+
+struct inode_operations cifs_file_inode_ops = {
+/*	revalidate:cifs_revalidate, */
+	.setattr = cifs_setattr,
+	.getattr = cifs_getattr, /* do we need this anymore? */
+	.rename = cifs_rename,
+	.permission = cifs_permission,
+#ifdef CONFIG_CIFS_XATTR
+	.setxattr = cifs_setxattr,
+	.getxattr = cifs_getxattr,
+	.listxattr = cifs_listxattr,
+	.removexattr = cifs_removexattr,
+#endif 
+};
+
+struct inode_operations cifs_symlink_inode_ops = {
+	.readlink = generic_readlink, 
+	.follow_link = cifs_follow_link,
+	.put_link = cifs_put_link,
+	.permission = cifs_permission,
+	/* BB add the following two eventually */
+	/* revalidate: cifs_revalidate,
+	   setattr:    cifs_notify_change, *//* BB do we need notify change */
+#ifdef CONFIG_CIFS_XATTR
+	.setxattr = cifs_setxattr,
+	.getxattr = cifs_getxattr,
+	.listxattr = cifs_listxattr,
+	.removexattr = cifs_removexattr,
+#endif 
+};
+
+struct file_operations cifs_file_ops = {
+	.read = cifs_read_wrapper,
+	.write = cifs_write_wrapper, 
+	.open = cifs_open,
+	.release = cifs_close,
+	.lock = cifs_lock,
+	.fsync = cifs_fsync,
+	.flush = cifs_flush,
+	.mmap  = cifs_file_mmap,
+	.sendfile = generic_file_sendfile,
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+	.readv = generic_file_readv,
+	.writev = generic_file_writev,
+	.aio_read = generic_file_aio_read,
+	.aio_write = generic_file_aio_write,
+	.dir_notify = cifs_dir_notify,
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
+};
+
+struct file_operations cifs_file_direct_ops = {
+	/* no mmap, no aio, no readv - 
+	   BB reevaluate whether they can be done with directio, no cache */
+	.read = cifs_user_read,
+	.write = cifs_user_write,
+	.open = cifs_open,
+	.release = cifs_close,
+	.lock = cifs_lock,
+	.fsync = cifs_fsync,
+	.flush = cifs_flush,
+	.sendfile = generic_file_sendfile, /* BB removeme BB */
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+	.dir_notify = cifs_dir_notify,
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
+};
+
+struct file_operations cifs_dir_ops = {
+	.readdir = cifs_readdir,
+	.release = cifs_closedir,
+	.read    = generic_read_dir,
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+	.dir_notify = cifs_dir_notify,
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
+};
+
+static void
+cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct cifsInodeInfo *cifsi = inode;
+
+	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		inode_init_once(&cifsi->vfs_inode);
+		INIT_LIST_HEAD(&cifsi->lockList);
+	}
+}
+
+static int
+cifs_init_inodecache(void)
+{
+	cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
+					      sizeof (struct cifsInodeInfo),
+					      0, SLAB_RECLAIM_ACCOUNT,
+					      cifs_init_once, NULL);
+	if (cifs_inode_cachep == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void
+cifs_destroy_inodecache(void)
+{
+	if (kmem_cache_destroy(cifs_inode_cachep))
+		printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
+}
+
+static int
+cifs_init_request_bufs(void)
+{
+	if(CIFSMaxBufSize < 8192) {
+	/* Buffer size can not be smaller than 2 * PATH_MAX since maximum
+	Unicode path name has to fit in any SMB/CIFS path based frames */
+		CIFSMaxBufSize = 8192;
+	} else if (CIFSMaxBufSize > 1024*127) {
+		CIFSMaxBufSize = 1024 * 127;
+	} else {
+		CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
+	}
+/*	cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
+	cifs_req_cachep = kmem_cache_create("cifs_request",
+					    CIFSMaxBufSize +
+					    MAX_CIFS_HDR_SIZE, 0,
+					    SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (cifs_req_cachep == NULL)
+		return -ENOMEM;
+
+	if(cifs_min_rcv < 1)
+		cifs_min_rcv = 1;
+	else if (cifs_min_rcv > 64) {
+		cifs_min_rcv = 64;
+		cERROR(1,("cifs_min_rcv set to maximum (64)"));
+	}
+
+	cifs_req_poolp = mempool_create(cifs_min_rcv,
+					mempool_alloc_slab,
+					mempool_free_slab,
+					cifs_req_cachep);
+
+	if(cifs_req_poolp == NULL) {
+		kmem_cache_destroy(cifs_req_cachep);
+		return -ENOMEM;
+	}
+	/* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
+	almost all handle based requests (but not write response, nor is it
+	sufficient for path based requests).  A smaller size would have
+	been more efficient (compacting multiple slab items on one 4k page) 
+	for the case in which debug was on, but this larger size allows
+	more SMBs to use small buffer alloc and is still much more
+	efficient to alloc 1 per page off the slab compared to 17K (5page) 
+	alloc of large cifs buffers even when page debugging is on */
+	cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
+			MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (cifs_sm_req_cachep == NULL) {
+		mempool_destroy(cifs_req_poolp);
+		kmem_cache_destroy(cifs_req_cachep);
+		return -ENOMEM;              
+	}
+
+	if(cifs_min_small < 2)
+		cifs_min_small = 2;
+	else if (cifs_min_small > 256) {
+		cifs_min_small = 256;
+		cFYI(1,("cifs_min_small set to maximum (256)"));
+	}
+
+	cifs_sm_req_poolp = mempool_create(cifs_min_small,
+				mempool_alloc_slab,
+				mempool_free_slab,
+				cifs_sm_req_cachep);
+
+	if(cifs_sm_req_poolp == NULL) {
+		mempool_destroy(cifs_req_poolp);
+		kmem_cache_destroy(cifs_req_cachep);
+		kmem_cache_destroy(cifs_sm_req_cachep);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void
+cifs_destroy_request_bufs(void)
+{
+	mempool_destroy(cifs_req_poolp);
+	if (kmem_cache_destroy(cifs_req_cachep))
+		printk(KERN_WARNING
+		       "cifs_destroy_request_cache: error not all structures were freed\n");
+	mempool_destroy(cifs_sm_req_poolp);
+	if (kmem_cache_destroy(cifs_sm_req_cachep))
+		printk(KERN_WARNING
+		      "cifs_destroy_request_cache: cifs_small_rq free error\n");
+}
+
+static int
+cifs_init_mids(void)
+{
+	cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
+				sizeof (struct mid_q_entry), 0,
+				SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (cifs_mid_cachep == NULL)
+		return -ENOMEM;
+
+	cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
+					mempool_alloc_slab,
+					mempool_free_slab,
+					cifs_mid_cachep);
+	if(cifs_mid_poolp == NULL) {
+		kmem_cache_destroy(cifs_mid_cachep);
+		return -ENOMEM;
+	}
+
+	cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
+				sizeof (struct oplock_q_entry), 0,
+				SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (cifs_oplock_cachep == NULL) {
+		kmem_cache_destroy(cifs_mid_cachep);
+		mempool_destroy(cifs_mid_poolp);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void
+cifs_destroy_mids(void)
+{
+	mempool_destroy(cifs_mid_poolp);
+	if (kmem_cache_destroy(cifs_mid_cachep))
+		printk(KERN_WARNING
+		       "cifs_destroy_mids: error not all structures were freed\n");
+
+	if (kmem_cache_destroy(cifs_oplock_cachep))
+		printk(KERN_WARNING
+		       "error not all oplock structures were freed\n");
+}
+
+static int cifs_oplock_thread(void * dummyarg)
+{
+	struct oplock_q_entry * oplock_item;
+	struct cifsTconInfo *pTcon;
+	struct inode * inode;
+	__u16  netfid;
+	int rc;
+
+	daemonize("cifsoplockd");
+	allow_signal(SIGTERM);
+
+	oplockThread = current;
+	do {
+		set_current_state(TASK_INTERRUPTIBLE);
+		
+		schedule_timeout(1*HZ);  
+		spin_lock(&GlobalMid_Lock);
+		if(list_empty(&GlobalOplock_Q)) {
+			spin_unlock(&GlobalMid_Lock);
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(39*HZ);
+		} else {
+			oplock_item = list_entry(GlobalOplock_Q.next, 
+				struct oplock_q_entry, qhead);
+			if(oplock_item) {
+				cFYI(1,("found oplock item to write out")); 
+				pTcon = oplock_item->tcon;
+				inode = oplock_item->pinode;
+				netfid = oplock_item->netfid;
+				spin_unlock(&GlobalMid_Lock);
+				DeleteOplockQEntry(oplock_item);
+				/* can not grab inode sem here since it would
+				deadlock when oplock received on delete 
+				since vfs_unlink holds the i_sem across
+				the call */
+				/* down(&inode->i_sem);*/
+				if (S_ISREG(inode->i_mode)) {
+					rc = filemap_fdatawrite(inode->i_mapping);
+					if(CIFS_I(inode)->clientCanCacheRead == 0) {
+						filemap_fdatawait(inode->i_mapping);
+						invalidate_remote_inode(inode);
+					}
+				} else
+					rc = 0;
+				/* up(&inode->i_sem);*/
+				if (rc)
+					CIFS_I(inode)->write_behind_rc = rc;
+				cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
+
+				/* releasing a stale oplock after recent reconnection 
+				of smb session using a now incorrect file 
+				handle is not a data integrity issue but do  
+				not bother sending an oplock release if session 
+				to server still is disconnected since oplock 
+				already released by the server in that case */
+				if(pTcon->tidStatus != CifsNeedReconnect) {
+				    rc = CIFSSMBLock(0, pTcon, netfid,
+					    0 /* len */ , 0 /* offset */, 0, 
+					    0, LOCKING_ANDX_OPLOCK_RELEASE,
+					    0 /* wait flag */);
+					cFYI(1,("Oplock release rc = %d ",rc));
+				}
+			} else
+				spin_unlock(&GlobalMid_Lock);
+		}
+	} while(!signal_pending(current));
+	complete_and_exit (&cifs_oplock_exited, 0);
+}
+
+static int __init
+init_cifs(void)
+{
+	int rc = 0;
+#ifdef CONFIG_PROC_FS
+	cifs_proc_init();
+#endif
+	INIT_LIST_HEAD(&GlobalServerList);	/* BB not implemented yet */
+	INIT_LIST_HEAD(&GlobalSMBSessionList);
+	INIT_LIST_HEAD(&GlobalTreeConnectionList);
+	INIT_LIST_HEAD(&GlobalOplock_Q);
+/*
+ *  Initialize Global counters
+ */
+	atomic_set(&sesInfoAllocCount, 0);
+	atomic_set(&tconInfoAllocCount, 0);
+	atomic_set(&tcpSesAllocCount,0);
+	atomic_set(&tcpSesReconnectCount, 0);
+	atomic_set(&tconInfoReconnectCount, 0);
+
+	atomic_set(&bufAllocCount, 0);
+	atomic_set(&midCount, 0);
+	GlobalCurrentXid = 0;
+	GlobalTotalActiveXid = 0;
+	GlobalMaxActiveXid = 0;
+	rwlock_init(&GlobalSMBSeslock);
+	spin_lock_init(&GlobalMid_Lock);
+
+	if(cifs_max_pending < 2) {
+		cifs_max_pending = 2;
+		cFYI(1,("cifs_max_pending set to min of 2"));
+	} else if(cifs_max_pending > 256) {
+		cifs_max_pending = 256;
+		cFYI(1,("cifs_max_pending set to max of 256"));
+	}
+
+	rc = cifs_init_inodecache();
+	if (!rc) {
+		rc = cifs_init_mids();
+		if (!rc) {
+			rc = cifs_init_request_bufs();
+			if (!rc) {
+				rc = register_filesystem(&cifs_fs_type);
+				if (!rc) {                
+					rc = (int)kernel_thread(cifs_oplock_thread, NULL, 
+						CLONE_FS | CLONE_FILES | CLONE_VM);
+					if(rc > 0)
+						return 0;
+					else 
+						cERROR(1,("error %d create oplock thread",rc));
+				}
+				cifs_destroy_request_bufs();
+			}
+			cifs_destroy_mids();
+		}
+		cifs_destroy_inodecache();
+	}
+#ifdef CONFIG_PROC_FS
+	cifs_proc_clean();
+#endif
+	return rc;
+}
+
+static void __exit
+exit_cifs(void)
+{
+	cFYI(0, ("In unregister ie exit_cifs"));
+#ifdef CONFIG_PROC_FS
+	cifs_proc_clean();
+#endif
+	unregister_filesystem(&cifs_fs_type);
+	cifs_destroy_inodecache();
+	cifs_destroy_mids();
+	cifs_destroy_request_bufs();
+	if(oplockThread) {
+		send_sig(SIGTERM, oplockThread, 1);
+		wait_for_completion(&cifs_oplock_exited);
+	}
+}
+
+MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
+MODULE_LICENSE("GPL");		/* combination of LGPL + GPL source behaves as GPL */
+MODULE_DESCRIPTION
+    ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
+MODULE_VERSION(CIFS_VERSION);
+module_init(init_cifs)
+module_exit(exit_cifs)