fs/cifs/dir.c - kernel/msm-4.9 - Gitiles

 /*
  *   fs/cifs/dir.c
  *
  *   vfs operations that deal with dentries
  *
  *   Copyright (C) International Business Machines  Corp., 2002,2003
  *   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/stat.h>
 #include <linux/slab.h>
 #include <linux/namei.h>
 #include "cifsfs.h"
 #include "cifspdu.h"
 #include "cifsglob.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"

 void
 renew_parental_timestamps(struct dentry *direntry)
 {
 	/* BB check if there is a way to get the kernel to do this or if we really need this */
 	do {
 		direntry->d_time = jiffies;
 		direntry = direntry->d_parent;
 	} while (!IS_ROOT(direntry));
 }

 /* Note: caller must free return buffer */
 char *
 build_path_from_dentry(struct dentry *direntry)
 {
 	struct dentry *temp;
 	int namelen = 0;
 	char *full_path;

 	if(direntry == NULL)
 		return NULL;  /* not much we can do if dentry is freed and
 		we need to reopen the file after it was closed implicitly
 		when the server crashed */

 cifs_bp_rename_retry:
 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen += (1 + temp->d_name.len);
 		temp = temp->d_parent;
 		if(temp == NULL) {
 			cERROR(1,("corrupt dentry"));
 			return NULL;
 		}
 	}

 	full_path = kmalloc(namelen+1, GFP_KERNEL);
 	if(full_path == NULL)
 		return full_path;
 	full_path[namelen] = 0;	/* trailing null */

 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen -= 1 + temp->d_name.len;
 		if (namelen < 0) {
 			break;
 		} else {
 			full_path[namelen] = '\\';
 			strncpy(full_path + namelen + 1, temp->d_name.name,
 				temp->d_name.len);
 			cFYI(0, (" name: %s ", full_path + namelen));
 		}
 		temp = temp->d_parent;
 		if(temp == NULL) {
 			cERROR(1,("corrupt dentry"));
 			kfree(full_path);
 			return NULL;
 		}
 	}
 	if (namelen != 0) {
 		cERROR(1,
 		       ("We did not end path lookup where we expected namelen is %d",
 			namelen));
 		/* presumably this is only possible if we were racing with a rename
 		of one of the parent directories  (we can not lock the dentries
 		above us to prevent this, but retrying should be harmless) */
 		kfree(full_path);
 		namelen = 0;
 		goto cifs_bp_rename_retry;
 	}

 	return full_path;
 }

 /* Note: caller must free return buffer */
 char *
 build_wildcard_path_from_dentry(struct dentry *direntry)
 {
 	struct dentry *temp;
 	int namelen = 0;
 	char *full_path;

 	if(direntry == NULL)
 		return NULL;  /* not much we can do if dentry is freed and
 		we need to reopen the file after it was closed implicitly
 		when the server crashed */

 cifs_bwp_rename_retry:
 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen += (1 + temp->d_name.len);
 		temp = temp->d_parent;
 		if(temp == NULL) {
 			cERROR(1,("corrupt dentry"));
 			return NULL;
 		}
 	}

 	full_path = kmalloc(namelen+3, GFP_KERNEL);
 	if(full_path == NULL)
 		return full_path;

 	full_path[namelen] = '\\';
 	full_path[namelen+1] = '*';
 	full_path[namelen+2] = 0;  /* trailing null */

 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen -= 1 + temp->d_name.len;
 		if (namelen < 0) {
 			break;
 		} else {
 			full_path[namelen] = '\\';
 			strncpy(full_path + namelen + 1, temp->d_name.name,
 				temp->d_name.len);
 			cFYI(0, (" name: %s ", full_path + namelen));
 		}
 		temp = temp->d_parent;
 		if(temp == NULL) {
 			cERROR(1,("corrupt dentry"));
 			kfree(full_path);
 			return NULL;
 		}
 	}
 	if (namelen != 0) {
 		cERROR(1,
 		       ("We did not end path lookup where we expected namelen is %d",
 			namelen));
 		/* presumably this is only possible if we were racing with a rename
 		of one of the parent directories  (we can not lock the dentries
 		above us to prevent this, but retrying should be harmless) */
 		kfree(full_path);
 		namelen = 0;
 		goto cifs_bwp_rename_retry;
 	}

 	return full_path;
 }

 /* Inode operations in similar order to how they appear in the Linux file fs.h */

 int
 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 		struct nameidata *nd)
 {
 	int rc = -ENOENT;
 	int xid;
 	int oplock = 0;
 	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
 	__u16 fileHandle;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	FILE_ALL_INFO * buf = NULL;
 	struct inode *newinode = NULL;
 	struct cifsFileInfo * pCifsFile = NULL;
 	struct cifsInodeInfo * pCifsInode;
 	int disposition = FILE_OVERWRITE_IF;
 	int write_only = FALSE;

 	xid = GetXid();

 	cifs_sb = CIFS_SB(inode->i_sb);
 	pTcon = cifs_sb->tcon;

 	down(&direntry->d_sb->s_vfs_rename_sem);
 	full_path = build_path_from_dentry(direntry);
 	up(&direntry->d_sb->s_vfs_rename_sem);
 	if(full_path == NULL) {
 		FreeXid(xid);
 		return -ENOMEM;
 	}

 	if(nd) {
 		if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
 			desiredAccess = GENERIC_READ;
 		else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
 			desiredAccess = GENERIC_WRITE;
 			write_only = TRUE;
 		} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
 			/* GENERIC_ALL is too much permission to request */
 			/* can cause unnecessary access denied on create */
 			/* desiredAccess = GENERIC_ALL; */
 			desiredAccess = GENERIC_READ | GENERIC_WRITE;
 		}

 		if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 			disposition = FILE_CREATE;
 		else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 			disposition = FILE_OVERWRITE_IF;
 		else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
 			disposition = FILE_OPEN_IF;
 		else {
 			cFYI(1,("Create flag not set in create function"));
 		}
 	}

 	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
 	if (oplockEnabled)
 		oplock = REQ_OPLOCK;

 	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
 	if(buf == NULL) {
 		kfree(full_path);
 		FreeXid(xid);
 		return -ENOMEM;
 	}

 	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
 			 desiredAccess, CREATE_NOT_DIR,
 			 &fileHandle, &oplock, buf, cifs_sb->local_nls);
 	if (rc) {
 		cFYI(1, ("cifs_create returned 0x%x ", rc));
 	} else {
 		/* If Open reported that we actually created a file
 		then we now have to set the mode if possible */
 		if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
 			(oplock & CIFS_CREATE_ACTION))
 			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
 					(__u64)current->euid,
 					(__u64)current->egid,
 					0 /* dev */,
 					cifs_sb->local_nls);
 			} else {
 				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
 					(__u64)-1,
 					(__u64)-1,
 					0 /* dev */,
 					cifs_sb->local_nls);
 			}
 		else {
 			/* BB implement via Windows security descriptors */
 			/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
 			/* could set r/o dos attribute if mode & 0222 == 0 */
 		}

 	/* BB server might mask mode so we have to query for Unix case*/
 		if (pTcon->ses->capabilities & CAP_UNIX)
 			rc = cifs_get_inode_info_unix(&newinode, full_path,
 						 inode->i_sb,xid);
 		else {
 			rc = cifs_get_inode_info(&newinode, full_path,
 						 buf, inode->i_sb,xid);
 			if(newinode)
 				newinode->i_mode = mode;
 		}

 		if (rc != 0) {
 			cFYI(1,("Create worked but get_inode_info failed with rc = %d",
 			      rc));
 		} else {
 			direntry->d_op = &cifs_dentry_ops;
 			d_instantiate(direntry, newinode);
 		}
 		if((nd->flags & LOOKUP_OPEN) == FALSE) {
 			/* mknod case - do not leave file open */
 			CIFSSMBClose(xid, pTcon, fileHandle);
 		} else if(newinode) {
 			pCifsFile = (struct cifsFileInfo *)
 			   kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);

 			if (pCifsFile) {
 				memset((char *)pCifsFile, 0,
 				       sizeof (struct cifsFileInfo));
 				pCifsFile->netfid = fileHandle;
 				pCifsFile->pid = current->tgid;
 				pCifsFile->pInode = newinode;
 				pCifsFile->invalidHandle = FALSE;
 				pCifsFile->closePend     = FALSE;
 				init_MUTEX(&pCifsFile->fh_sem);
 				/* put the following in at open now */
 				/* pCifsFile->pfile = file; */
 				write_lock(&GlobalSMBSeslock);
 				list_add(&pCifsFile->tlist,&pTcon->openFileList);
 				pCifsInode = CIFS_I(newinode);
 				if(pCifsInode) {
 				/* if readable file instance put first in list*/
 					if (write_only == TRUE) {
                                         	list_add_tail(&pCifsFile->flist,
 							&pCifsInode->openFileList);
 					} else {
 						list_add(&pCifsFile->flist,
 							&pCifsInode->openFileList);
 					}
 					if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
 						pCifsInode->clientCanCacheAll = TRUE;
 						pCifsInode->clientCanCacheRead = TRUE;
 						cFYI(1,("Exclusive Oplock granted on inode %p",
 							newinode));
 					} else if((oplock & 0xF) == OPLOCK_READ)
 						pCifsInode->clientCanCacheRead = TRUE;
 				}
 				write_unlock(&GlobalSMBSeslock);
 			}
 		}
 	}

 	if (buf)
 	    kfree(buf);
 	if (full_path)
 	    kfree(full_path);
 	FreeXid(xid);

 	return rc;
 }

 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t device_number)
 {
 	int rc = -EPERM;
 	int xid;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;
 	struct inode * newinode = NULL;

 	if (!old_valid_dev(device_number))
 		return -EINVAL;

 	xid = GetXid();

 	cifs_sb = CIFS_SB(inode->i_sb);
 	pTcon = cifs_sb->tcon;

 	down(&direntry->d_sb->s_vfs_rename_sem);
 	full_path = build_path_from_dentry(direntry);
 	up(&direntry->d_sb->s_vfs_rename_sem);
 	if(full_path == NULL)
 		rc = -ENOMEM;

 	if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
 		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 				mode,(__u64)current->euid,(__u64)current->egid,
 				device_number, cifs_sb->local_nls);
 		} else {
 			rc = CIFSSMBUnixSetPerms(xid, pTcon,
 				full_path, mode, (__u64)-1, (__u64)-1,
 				device_number, cifs_sb->local_nls);
 		}

 		if(!rc) {
 			rc = cifs_get_inode_info_unix(&newinode, full_path,
 						inode->i_sb,xid);
 			direntry->d_op = &cifs_dentry_ops;
 			if(rc == 0)
 				d_instantiate(direntry, newinode);
 		}
 	}

 	if (full_path)
 		kfree(full_path);
 	FreeXid(xid);

 	return rc;
 }


 struct dentry *
 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
 {
 	int xid;
 	int rc = 0; /* to get around spurious gcc warning, set to zero here */
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *pTcon;
 	struct inode *newInode = NULL;
 	char *full_path = NULL;

 	xid = GetXid();

 	cFYI(1,
 	     (" parent inode = 0x%p name is: %s and dentry = 0x%p",
 	      parent_dir_inode, direntry->d_name.name, direntry));

 	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */

 	/* check whether path exists */

 	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
 	pTcon = cifs_sb->tcon;

 	/* can not grab the rename sem here since it would
 	deadlock in the cases (beginning of sys_rename itself)
 	in which we already have the sb rename sem */
 	full_path = build_path_from_dentry(direntry);
 	if(full_path == NULL) {
 		FreeXid(xid);
 		return ERR_PTR(-ENOMEM);
 	}

 	if (direntry->d_inode != NULL) {
 		cFYI(1, (" non-NULL inode in lookup"));
 	} else {
 		cFYI(1, (" NULL inode in lookup"));
 	}
 	cFYI(1,
 	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

 	if (pTcon->ses->capabilities & CAP_UNIX)
 		rc = cifs_get_inode_info_unix(&newInode, full_path,
 					      parent_dir_inode->i_sb,xid);
 	else
 		rc = cifs_get_inode_info(&newInode, full_path, NULL,
 					 parent_dir_inode->i_sb,xid);

 	if ((rc == 0) && (newInode != NULL)) {
 		direntry->d_op = &cifs_dentry_ops;
 		d_add(direntry, newInode);

 		/* since paths are not looked up by component - the parent directories are presumed to be good here */
 		renew_parental_timestamps(direntry);

 	} else if (rc == -ENOENT) {
 		rc = 0;
 		d_add(direntry, NULL);
 	} else {
 		cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
 		/* BB special case check for Access Denied - watch security
 		exposure of returning dir info implicitly via different rc
 		if file exists or not but no access BB */
 	}

 	if (full_path)
 		kfree(full_path);
 	FreeXid(xid);
 	return ERR_PTR(rc);
 }

 int
 cifs_dir_open(struct inode *inode, struct file *file)
 {				/* NB: currently unused since searches are opened in readdir */
 	int rc = 0;
 	int xid;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *pTcon;
 	char *full_path = NULL;

 	xid = GetXid();

 	cifs_sb = CIFS_SB(inode->i_sb);
 	pTcon = cifs_sb->tcon;

 	if(file->f_dentry) {
 		down(&file->f_dentry->d_sb->s_vfs_rename_sem);
 		full_path = build_wildcard_path_from_dentry(file->f_dentry);
 		up(&file->f_dentry->d_sb->s_vfs_rename_sem);
 	} else {
 		FreeXid(xid);
 		return -EIO;
 	}

 	cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));

 	if (full_path)
 		kfree(full_path);
 	FreeXid(xid);
 	return rc;
 }

 static int
 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
 {
 	int isValid = 1;

 /*	lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */

 	if (direntry->d_inode) {
 		if (cifs_revalidate(direntry)) {
 			/* unlock_kernel(); */
 			return 0;
 		}
 	} else {
 		cFYI(1,
 		     ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
 		      direntry->d_name.name, direntry));
 	}

 /*    unlock_kernel(); */

 	return isValid;
 }

 /* static int cifs_d_delete(struct dentry *direntry)
 {
 	int rc = 0;

 	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));

 	return rc;
 }     */

 struct dentry_operations cifs_dentry_ops = {
 	.d_revalidate = cifs_d_revalidate,
 /* d_delete:       cifs_d_delete,       *//* not needed except for debugging */
 	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
 };
	/*
	* fs/cifs/dir.c
	*
	* vfs operations that deal with dentries
	*
	* Copyright (C) International Business Machines Corp., 2002,2003
	* 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/stat.h>
	#include <linux/slab.h>
	#include <linux/namei.h>
	#include "cifsfs.h"
	#include "cifspdu.h"
	#include "cifsglob.h"
	#include "cifsproto.h"
	#include "cifs_debug.h"
	#include "cifs_fs_sb.h"

	void
	renew_parental_timestamps(struct dentry *direntry)
	{
	/* BB check if there is a way to get the kernel to do this or if we really need this */
	do {
	direntry->d_time = jiffies;
	direntry = direntry->d_parent;
	} while (!IS_ROOT(direntry));
	}

	/* Note: caller must free return buffer */
	char *
	build_path_from_dentry(struct dentry *direntry)
	{
	struct dentry *temp;
	int namelen = 0;
	char *full_path;

	if(direntry == NULL)
	return NULL; /* not much we can do if dentry is freed and
	we need to reopen the file after it was closed implicitly
	when the server crashed */

	cifs_bp_rename_retry:
	for (temp = direntry; !IS_ROOT(temp);) {
	namelen += (1 + temp->d_name.len);
	temp = temp->d_parent;
	if(temp == NULL) {
	cERROR(1,("corrupt dentry"));
	return NULL;
	}
	}

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if(full_path == NULL)
	return full_path;
	full_path[namelen] = 0; /* trailing null */

	for (temp = direntry; !IS_ROOT(temp);) {
	namelen -= 1 + temp->d_name.len;
	if (namelen < 0) {
	break;
	} else {
	full_path[namelen] = '\\';
	strncpy(full_path + namelen + 1, temp->d_name.name,
	temp->d_name.len);
	cFYI(0, (" name: %s ", full_path + namelen));
	}
	temp = temp->d_parent;
	if(temp == NULL) {
	cERROR(1,("corrupt dentry"));
	kfree(full_path);
	return NULL;
	}
	}
	if (namelen != 0) {
	cERROR(1,
	("We did not end path lookup where we expected namelen is %d",
	namelen));
	/* presumably this is only possible if we were racing with a rename
	of one of the parent directories (we can not lock the dentries
	above us to prevent this, but retrying should be harmless) */
	kfree(full_path);
	namelen = 0;
	goto cifs_bp_rename_retry;
	}

	return full_path;
	}

	/* Note: caller must free return buffer */
	char *
	build_wildcard_path_from_dentry(struct dentry *direntry)
	{
	struct dentry *temp;
	int namelen = 0;
	char *full_path;

	if(direntry == NULL)
	return NULL; /* not much we can do if dentry is freed and
	we need to reopen the file after it was closed implicitly
	when the server crashed */

	cifs_bwp_rename_retry:
	for (temp = direntry; !IS_ROOT(temp);) {
	namelen += (1 + temp->d_name.len);
	temp = temp->d_parent;
	if(temp == NULL) {
	cERROR(1,("corrupt dentry"));
	return NULL;
	}
	}

	full_path = kmalloc(namelen+3, GFP_KERNEL);
	if(full_path == NULL)
	return full_path;

	full_path[namelen] = '\\';
	full_path[namelen+1] = '*';
	full_path[namelen+2] = 0; /* trailing null */

	for (temp = direntry; !IS_ROOT(temp);) {
	namelen -= 1 + temp->d_name.len;
	if (namelen < 0) {
	break;
	} else {
	full_path[namelen] = '\\';
	strncpy(full_path + namelen + 1, temp->d_name.name,
	temp->d_name.len);
	cFYI(0, (" name: %s ", full_path + namelen));
	}
	temp = temp->d_parent;
	if(temp == NULL) {
	cERROR(1,("corrupt dentry"));
	kfree(full_path);
	return NULL;
	}
	}
	if (namelen != 0) {
	cERROR(1,
	("We did not end path lookup where we expected namelen is %d",
	namelen));
	/* presumably this is only possible if we were racing with a rename
	of one of the parent directories (we can not lock the dentries
	above us to prevent this, but retrying should be harmless) */
	kfree(full_path);
	namelen = 0;
	goto cifs_bwp_rename_retry;
	}

	return full_path;
	}

	/* Inode operations in similar order to how they appear in the Linux file fs.h */

	int
	cifs_create(struct inode inode, struct dentry direntry, int mode,
	struct nameidata *nd)
	{
	int rc = -ENOENT;
	int xid;
	int oplock = 0;
	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO * buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo * pCifsFile = NULL;
	struct cifsInodeInfo * pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	int write_only = FALSE;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL) {
	FreeXid(xid);
	return -ENOMEM;
	}

	if(nd) {
	if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
	desiredAccess = GENERIC_READ;
	else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
	desiredAccess = GENERIC_WRITE;
	write_only = TRUE;
	} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
	/* GENERIC_ALL is too much permission to request */
	/* can cause unnecessary access denied on create */
	/* desiredAccess = GENERIC_ALL; */
	desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	}

	if((nd->intent.open.flags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
	disposition = FILE_CREATE;
	else if((nd->intent.open.flags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
	disposition = FILE_OVERWRITE_IF;
	else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
	disposition = FILE_OPEN_IF;
	else {
	cFYI(1,("Create flag not set in create function"));
	}
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
	if (oplockEnabled)
	oplock = REQ_OPLOCK;

	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	if(buf == NULL) {
	kfree(full_path);
	FreeXid(xid);
	return -ENOMEM;
	}

	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
	desiredAccess, CREATE_NOT_DIR,
	&fileHandle, &oplock, buf, cifs_sb->local_nls);
	if (rc) {
	cFYI(1, ("cifs_create returned 0x%x ", rc));
	} else {
	/* If Open reported that we actually created a file
	then we now have to set the mode if possible */
	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
	(oplock & CIFS_CREATE_ACTION))
	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	(__u64)current->euid,
	(__u64)current->egid,
	0 /* dev */,
	cifs_sb->local_nls);
	} else {
	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	(__u64)-1,
	(__u64)-1,
	0 /* dev */,
	cifs_sb->local_nls);
	}
	else {
	/* BB implement via Windows security descriptors */
	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
	/* could set r/o dos attribute if mode & 0222 == 0 */
	}

	/* BB server might mask mode so we have to query for Unix case*/
	if (pTcon->ses->capabilities & CAP_UNIX)
	rc = cifs_get_inode_info_unix(&newinode, full_path,
	inode->i_sb,xid);
	else {
	rc = cifs_get_inode_info(&newinode, full_path,
	buf, inode->i_sb,xid);
	if(newinode)
	newinode->i_mode = mode;
	}

	if (rc != 0) {
	cFYI(1,("Create worked but get_inode_info failed with rc = %d",
	rc));
	} else {
	direntry->d_op = &cifs_dentry_ops;
	d_instantiate(direntry, newinode);
	}
	if((nd->flags & LOOKUP_OPEN) == FALSE) {
	/* mknod case - do not leave file open */
	CIFSSMBClose(xid, pTcon, fileHandle);
	} else if(newinode) {
	pCifsFile = (struct cifsFileInfo *)
	kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);

	if (pCifsFile) {
	memset((char *)pCifsFile, 0,
	sizeof (struct cifsFileInfo));
	pCifsFile->netfid = fileHandle;
	pCifsFile->pid = current->tgid;
	pCifsFile->pInode = newinode;
	pCifsFile->invalidHandle = FALSE;
	pCifsFile->closePend = FALSE;
	init_MUTEX(&pCifsFile->fh_sem);
	/* put the following in at open now */
	/* pCifsFile->pfile = file; */
	write_lock(&GlobalSMBSeslock);
	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	pCifsInode = CIFS_I(newinode);
	if(pCifsInode) {
	/* if readable file instance put first in list*/
	if (write_only == TRUE) {
	list_add_tail(&pCifsFile->flist,
	&pCifsInode->openFileList);
	} else {
	list_add(&pCifsFile->flist,
	&pCifsInode->openFileList);
	}
	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	pCifsInode->clientCanCacheAll = TRUE;
	pCifsInode->clientCanCacheRead = TRUE;
	cFYI(1,("Exclusive Oplock granted on inode %p",
	newinode));
	} else if((oplock & 0xF) == OPLOCK_READ)
	pCifsInode->clientCanCacheRead = TRUE;
	}
	write_unlock(&GlobalSMBSeslock);
	}
	}
	}

	if (buf)
	kfree(buf);
	if (full_path)
	kfree(full_path);
	FreeXid(xid);

	return rc;
	}

	int cifs_mknod(struct inode inode, struct dentry direntry, int mode, dev_t device_number)
	{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode * newinode = NULL;

	if (!old_valid_dev(device_number))
	return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL)
	rc = -ENOMEM;

	if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
	mode,(__u64)current->euid,(__u64)current->egid,
	device_number, cifs_sb->local_nls);
	} else {
	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	full_path, mode, (__u64)-1, (__u64)-1,
	device_number, cifs_sb->local_nls);
	}

	if(!rc) {
	rc = cifs_get_inode_info_unix(&newinode, full_path,
	inode->i_sb,xid);
	direntry->d_op = &cifs_dentry_ops;
	if(rc == 0)
	d_instantiate(direntry, newinode);
	}
	}

	if (full_path)
	kfree(full_path);
	FreeXid(xid);

	return rc;
	}


	struct dentry *
	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1,
	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	parent_dir_inode, direntry->d_name.name, direntry));

	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
	FreeXid(xid);
	return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
	cFYI(1, (" non-NULL inode in lookup"));
	} else {
	cFYI(1, (" NULL inode in lookup"));
	}
	cFYI(1,
	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

	if (pTcon->ses->capabilities & CAP_UNIX)
	rc = cifs_get_inode_info_unix(&newInode, full_path,
	parent_dir_inode->i_sb,xid);
	else
	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	parent_dir_inode->i_sb,xid);

	if ((rc == 0) && (newInode != NULL)) {
	direntry->d_op = &cifs_dentry_ops;
	d_add(direntry, newInode);

	/* since paths are not looked up by component - the parent directories are presumed to be good here */
	renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
	rc = 0;
	d_add(direntry, NULL);
	} else {
	cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
	/* BB special case check for Access Denied - watch security
	exposure of returning dir info implicitly via different rc
	if file exists or not but no access BB */
	}

	if (full_path)
	kfree(full_path);
	FreeXid(xid);
	return ERR_PTR(rc);
	}

	int
	cifs_dir_open(struct inode inode, struct file file)
	{ /* NB: currently unused since searches are opened in readdir */
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	if(file->f_dentry) {
	down(&file->f_dentry->d_sb->s_vfs_rename_sem);
	full_path = build_wildcard_path_from_dentry(file->f_dentry);
	up(&file->f_dentry->d_sb->s_vfs_rename_sem);
	} else {
	FreeXid(xid);
	return -EIO;
	}

	cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));

	if (full_path)
	kfree(full_path);
	FreeXid(xid);
	return rc;
	}

	static int
	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	{
	int isValid = 1;

	/* lock_kernel(); // surely we do not want to lock the kernel for a whole network round trip which could take seconds */

	if (direntry->d_inode) {
	if (cifs_revalidate(direntry)) {
	/* unlock_kernel(); */
	return 0;
	}
	} else {
	cFYI(1,
	("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
	direntry->d_name.name, direntry));
	}

	/* unlock_kernel(); */

	return isValid;
	}

	/* static int cifs_d_delete(struct dentry *direntry)
	{
	int rc = 0;

	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));

	return rc;
	} */

	struct dentry_operations cifs_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	/* d_delete: cifs_d_delete, // not needed except for debugging */
	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	};