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., 2002,2005
  *   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;
 	char dirsep;

 	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 */

 	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
 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] = dirsep;
 			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;
 }

 /* char * build_wildcard_path_from_dentry(struct dentry *direntry)
 {
 	if(full_path == NULL)
 		return full_path;

 	full_path[namelen] = '\\';
 	full_path[namelen+1] = '*';
 	full_path[namelen+2] = 0;
 BB remove above eight lines BB */

 /* Inode operations in similar order to how they appear in 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;

 	full_path = build_path_from_dentry(direntry);
 	if(full_path == NULL) {
 		FreeXid(xid);
 		return -ENOMEM;
 	}

 	if(nd && (nd->flags & LOOKUP_OPEN)) {
 		int oflags = nd->intent.open.flags;

 		desiredAccess = 0;
 		if (oflags & FMODE_READ)
 			desiredAccess |= GENERIC_READ;
 		if (oflags & FMODE_WRITE) {
 			desiredAccess |= GENERIC_WRITE;
 			if (!(oflags & FMODE_READ))
 				write_only = TRUE;
 		}

 		if((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 			disposition = FILE_CREATE;
 		else if((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
 			disposition = FILE_OVERWRITE_IF;
 		else if((oflags & 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;
 	}
 	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
 		rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
 			 desiredAccess, CREATE_NOT_DIR,
 			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
 			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 	else
 		rc = -EIO; /* no NT SMB support fall into legacy open below */

 	if(rc == -EIO) {
 		/* old server, retry the open legacy style */
 		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
 			desiredAccess, CREATE_NOT_DIR,
 			&fileHandle, &oplock, buf, cifs_sb->local_nls,
 			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 	}
 	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->fsuid,
 					(__u64)current->fsgid,
 					0 /* dev */,
 					cifs_sb->local_nls,
 					cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
 			} else {
 				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
 					(__u64)-1,
 					(__u64)-1,
 					0 /* dev */,
 					cifs_sb->local_nls,
 					cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
 			}
 		else {
 			/* BB implement mode setting 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((oplock & CIFS_CREATE_ACTION) &&
 				  (cifs_sb->mnt_cifs_flags &
 				     CIFS_MOUNT_SET_UID)) {
 					newinode->i_uid = current->fsuid;
 					newinode->i_gid = current->fsgid;
 				}
 			}
 		}

 		if (rc != 0) {
 			cFYI(1,
 			     ("Create worked but get_inode_info failed rc = %d",
 			      rc));
 		} else {
 			if (pTcon->nocase)
 				direntry->d_op = &cifs_ci_dentry_ops;
 			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 =
 			   kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);

 			if(pCifsFile == NULL)
 				goto cifs_create_out;
 			pCifsFile->netfid = fileHandle;
 			pCifsFile->pid = current->tgid;
 			pCifsFile->pInode = newinode;
 			pCifsFile->invalidHandle = FALSE;
 			pCifsFile->closePend     = FALSE;
 			init_MUTEX(&pCifsFile->fh_sem);
 			/* set the following in 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 for inode %p",
 						newinode));
 				} else if((oplock & 0xF) == OPLOCK_READ)
 					pCifsInode->clientCanCacheRead = TRUE;
 			}
 			write_unlock(&GlobalSMBSeslock);
 		}
 	}
 cifs_create_out:
 	kfree(buf);
 	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;

 	full_path = build_path_from_dentry(direntry);
 	if(full_path == NULL)
 		rc = -ENOMEM;
 	else if (pTcon->ses->capabilities & CAP_UNIX) {
 		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 				mode,(__u64)current->fsuid,(__u64)current->fsgid,
 				device_number, cifs_sb->local_nls,
 				cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 		} else {
 			rc = CIFSSMBUnixSetPerms(xid, pTcon,
 				full_path, mode, (__u64)-1, (__u64)-1,
 				device_number, cifs_sb->local_nls,
 				cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 		}

 		if(!rc) {
 			rc = cifs_get_inode_info_unix(&newinode, full_path,
 						inode->i_sb,xid);
 			if (pTcon->nocase)
 				direntry->d_op = &cifs_ci_dentry_ops;
 			else
 				direntry->d_op = &cifs_dentry_ops;
 			if(rc == 0)
 				d_instantiate(direntry, newinode);
 		}
 	} else {
 		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 			int oplock = 0;
 			u16 fileHandle;
 			FILE_ALL_INFO * buf;

 			cFYI(1,("sfu compat create special file"));

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

 			rc = CIFSSMBOpen(xid, pTcon, full_path,
 					 FILE_CREATE, /* fail if exists */
 					 GENERIC_WRITE /* BB would
 					  WRITE_OWNER | WRITE_DAC be better? */,
 					 /* Create a file and set the
 					    file attribute to SYSTEM */
 					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
 					 &fileHandle, &oplock, buf,
 					 cifs_sb->local_nls,
 					 cifs_sb->mnt_cifs_flags &
 					    CIFS_MOUNT_MAP_SPECIAL_CHR);

 			/* BB FIXME - add handling for backlevel servers
 			   which need legacy open and check for all
 			   calls to SMBOpen for fallback to
 			   SMBLeagcyOpen */
 			if(!rc) {
 				/* BB Do not bother to decode buf since no
 				   local inode yet to put timestamps in,
 				   but we can reuse it safely */
 				int bytes_written;
 				struct win_dev *pdev;
 				pdev = (struct win_dev *)buf;
 				if(S_ISCHR(mode)) {
 					memcpy(pdev->type, "IntxCHR", 8);
 					pdev->major =
 					      cpu_to_le64(MAJOR(device_number));
 					pdev->minor =
 					      cpu_to_le64(MINOR(device_number));
 					rc = CIFSSMBWrite(xid, pTcon,
 						fileHandle,
 						sizeof(struct win_dev),
 						0, &bytes_written, (char *)pdev,
 						NULL, 0);
 				} else if(S_ISBLK(mode)) {
 					memcpy(pdev->type, "IntxBLK", 8);
 					pdev->major =
 					      cpu_to_le64(MAJOR(device_number));
 					pdev->minor =
 					      cpu_to_le64(MINOR(device_number));
 					rc = CIFSSMBWrite(xid, pTcon,
 						fileHandle,
 						sizeof(struct win_dev),
 						0, &bytes_written, (char *)pdev,
 						NULL, 0);
 				} /* else if(S_ISFIFO */
 				CIFSSMBClose(xid, pTcon, fileHandle);
 				d_drop(direntry);
 			}
 			kfree(buf);
 			/* add code here to set EAs */
 		}
 	}

 	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;

 	/*
 	 * Don't allow the separator character in a path component.
 	 * The VFS will not allow "/", but "\" is allowed by posix.
 	 */
 	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
 		int i;
 		for (i = 0; i < direntry->d_name.len; i++)
 			if (direntry->d_name.name[i] == '\\') {
 				cFYI(1, ("Invalid file name"));
 				FreeXid(xid);
 				return ERR_PTR(-EINVAL);
 			}
 	}

 	/* 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)) {
 		if (pTcon->nocase)
 			direntry->d_op = &cifs_ci_dentry_ops;
 		else
 			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;
 		direntry->d_time = jiffies;
 		if (pTcon->nocase)
 			direntry->d_op = &cifs_ci_dentry_ops;
 		else
 			direntry->d_op = &cifs_dentry_ops;
 		d_add(direntry, NULL);
 	/*	if it was once a directory (but how can we tell?) we could do
 			shrink_dcache_parent(direntry); */
 	} else {
 		cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
 			   rc,full_path));
 		/* 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 */
 	}

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

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

 	if (direntry->d_inode) {
 		if (cifs_revalidate(direntry)) {
 			return 0;
 		}
 	} else {
 		cFYI(1, ("neg dentry 0x%p name = %s",
 			 direntry, direntry->d_name.name));
 		if(time_after(jiffies, direntry->d_time + HZ) ||
 			!lookupCacheEnabled) {
 			d_drop(direntry);
 			isValid = 0;
 		}
 	}

 	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 */
 };

 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
 {
 	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
 	unsigned long hash;
 	int i;

 	hash = init_name_hash();
 	for (i = 0; i < q->len; i++)
 		hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
 					 hash);
 	q->hash = end_name_hash(hash);

 	return 0;
 }

 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
 			   struct qstr *b)
 {
 	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;

 	if ((a->len == b->len) &&
 	    (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
 		/*
 		 * To preserve case, don't let an existing negative dentry's
 		 * case take precedence.  If a is not a negative dentry, this
 		 * should have no side effects
 		 */
 		memcpy((unsigned char *)a->name, b->name, a->len);
 		return 0;
 	}
 	return 1;
 }

 struct dentry_operations cifs_ci_dentry_ops = {
 	.d_revalidate = cifs_d_revalidate,
 	.d_hash = cifs_ci_hash,
 	.d_compare = cifs_ci_compare,
 };
	/*
	* fs/cifs/dir.c
	*
	* vfs operations that deal with dentries
	*
	* Copyright (C) International Business Machines Corp., 2002,2005
	* 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;
	char dirsep;

	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 */

	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
	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] = dirsep;
	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;
	}

	/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
	{
	if(full_path == NULL)
	return full_path;

	full_path[namelen] = '\\';
	full_path[namelen+1] = '*';
	full_path[namelen+2] = 0;
	BB remove above eight lines BB */

	/* Inode operations in similar order to how they appear in 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;

	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL) {
	FreeXid(xid);
	return -ENOMEM;
	}

	if(nd && (nd->flags & LOOKUP_OPEN)) {
	int oflags = nd->intent.open.flags;

	desiredAccess = 0;
	if (oflags & FMODE_READ)
	desiredAccess \|= GENERIC_READ;
	if (oflags & FMODE_WRITE) {
	desiredAccess \|= GENERIC_WRITE;
	if (!(oflags & FMODE_READ))
	write_only = TRUE;
	}

	if((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
	disposition = FILE_CREATE;
	else if((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
	disposition = FILE_OVERWRITE_IF;
	else if((oflags & 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;
	}
	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
	desiredAccess, CREATE_NOT_DIR,
	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
	rc = -EIO; /* no NT SMB support fall into legacy open below */

	if(rc == -EIO) {
	/* old server, retry the open legacy style */
	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
	desiredAccess, CREATE_NOT_DIR,
	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	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->fsuid,
	(__u64)current->fsgid,
	0 /* dev */,
	cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else {
	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	(__u64)-1,
	(__u64)-1,
	0 /* dev */,
	cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	else {
	/* BB implement mode setting 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((oplock & CIFS_CREATE_ACTION) &&
	(cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_SET_UID)) {
	newinode->i_uid = current->fsuid;
	newinode->i_gid = current->fsgid;
	}
	}
	}

	if (rc != 0) {
	cFYI(1,
	("Create worked but get_inode_info failed rc = %d",
	rc));
	} else {
	if (pTcon->nocase)
	direntry->d_op = &cifs_ci_dentry_ops;
	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 =
	kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);

	if(pCifsFile == NULL)
	goto cifs_create_out;
	pCifsFile->netfid = fileHandle;
	pCifsFile->pid = current->tgid;
	pCifsFile->pInode = newinode;
	pCifsFile->invalidHandle = FALSE;
	pCifsFile->closePend = FALSE;
	init_MUTEX(&pCifsFile->fh_sem);
	/* set the following in 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 for inode %p",
	newinode));
	} else if((oplock & 0xF) == OPLOCK_READ)
	pCifsInode->clientCanCacheRead = TRUE;
	}
	write_unlock(&GlobalSMBSeslock);
	}
	}
	cifs_create_out:
	kfree(buf);
	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;

	full_path = build_path_from_dentry(direntry);
	if(full_path == NULL)
	rc = -ENOMEM;
	else if (pTcon->ses->capabilities & CAP_UNIX) {
	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
	mode,(__u64)current->fsuid,(__u64)current->fsgid,
	device_number, cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else {
	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	full_path, mode, (__u64)-1, (__u64)-1,
	device_number, cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_MAP_SPECIAL_CHR);
	}

	if(!rc) {
	rc = cifs_get_inode_info_unix(&newinode, full_path,
	inode->i_sb,xid);
	if (pTcon->nocase)
	direntry->d_op = &cifs_ci_dentry_ops;
	else
	direntry->d_op = &cifs_dentry_ops;
	if(rc == 0)
	d_instantiate(direntry, newinode);
	}
	} else {
	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
	int oplock = 0;
	u16 fileHandle;
	FILE_ALL_INFO * buf;

	cFYI(1,("sfu compat create special file"));

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

	rc = CIFSSMBOpen(xid, pTcon, full_path,
	FILE_CREATE, /* fail if exists */
	GENERIC_WRITE /* BB would
	WRITE_OWNER \| WRITE_DAC be better? */,
	/* Create a file and set the
	file attribute to SYSTEM */
	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	&fileHandle, &oplock, buf,
	cifs_sb->local_nls,
	cifs_sb->mnt_cifs_flags &
	CIFS_MOUNT_MAP_SPECIAL_CHR);

	/* BB FIXME - add handling for backlevel servers
	which need legacy open and check for all
	calls to SMBOpen for fallback to
	SMBLeagcyOpen */
	if(!rc) {
	/* BB Do not bother to decode buf since no
	local inode yet to put timestamps in,
	but we can reuse it safely */
	int bytes_written;
	struct win_dev *pdev;
	pdev = (struct win_dev *)buf;
	if(S_ISCHR(mode)) {
	memcpy(pdev->type, "IntxCHR", 8);
	pdev->major =
	cpu_to_le64(MAJOR(device_number));
	pdev->minor =
	cpu_to_le64(MINOR(device_number));
	rc = CIFSSMBWrite(xid, pTcon,
	fileHandle,
	sizeof(struct win_dev),
	0, &bytes_written, (char *)pdev,
	NULL, 0);
	} else if(S_ISBLK(mode)) {
	memcpy(pdev->type, "IntxBLK", 8);
	pdev->major =
	cpu_to_le64(MAJOR(device_number));
	pdev->minor =
	cpu_to_le64(MINOR(device_number));
	rc = CIFSSMBWrite(xid, pTcon,
	fileHandle,
	sizeof(struct win_dev),
	0, &bytes_written, (char *)pdev,
	NULL, 0);
	} /* else if(S_ISFIFO */
	CIFSSMBClose(xid, pTcon, fileHandle);
	d_drop(direntry);
	}
	kfree(buf);
	/* add code here to set EAs */
	}
	}

	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;

	/*
	* Don't allow the separator character in a path component.
	* The VFS will not allow "/", but "\" is allowed by posix.
	*/
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	int i;
	for (i = 0; i < direntry->d_name.len; i++)
	if (direntry->d_name.name[i] == '\\') {
	cFYI(1, ("Invalid file name"));
	FreeXid(xid);
	return ERR_PTR(-EINVAL);
	}
	}

	/* 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)) {
	if (pTcon->nocase)
	direntry->d_op = &cifs_ci_dentry_ops;
	else
	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;
	direntry->d_time = jiffies;
	if (pTcon->nocase)
	direntry->d_op = &cifs_ci_dentry_ops;
	else
	direntry->d_op = &cifs_dentry_ops;
	d_add(direntry, NULL);
	/* if it was once a directory (but how can we tell?) we could do
	shrink_dcache_parent(direntry); */
	} else {
	cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
	rc,full_path));
	/* 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 */
	}

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

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

	if (direntry->d_inode) {
	if (cifs_revalidate(direntry)) {
	return 0;
	}
	} else {
	cFYI(1, ("neg dentry 0x%p name = %s",
	direntry, direntry->d_name.name));
	if(time_after(jiffies, direntry->d_time + HZ) \|\|
	!lookupCacheEnabled) {
	d_drop(direntry);
	isValid = 0;
	}
	}

	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 */
	};

	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	unsigned long hash;
	int i;

	hash = init_name_hash();
	for (i = 0; i < q->len; i++)
	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	hash);
	q->hash = end_name_hash(hash);

	return 0;
	}

	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	struct qstr *b)
	{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;

	if ((a->len == b->len) &&
	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	/*
	* To preserve case, don't let an existing negative dentry's
	* case take precedence. If a is not a negative dentry, this
	* should have no side effects
	*/
	memcpy((unsigned char *)a->name, b->name, a->len);
	return 0;
	}
	return 1;
	}

	struct dentry_operations cifs_ci_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	.d_hash = cifs_ci_hash,
	.d_compare = cifs_ci_compare,
	};