/*
 *   fs/cifs/inode.c
 *
 *   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/buffer_head.h>
#include <linux/stat.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

int cifs_get_inode_info_unix(struct inode **pinode,
	const unsigned char *search_path, struct super_block *sb, int xid)
{
	int rc = 0;
	FILE_UNIX_BASIC_INFO findData;
	struct cifsTconInfo *pTcon;
	struct inode *inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *tmp_path;

	pTcon = cifs_sb->tcon;
	cFYI(1, (" Getting info on %s ", search_path));
	/* could have done a find first instead but this returns more info */
	rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
				  cifs_sb->local_nls);
/*	dump_mem("\nUnixQPathInfo return data", &findData,
		 sizeof(findData)); */
	if (rc) {
		if (rc == -EREMOTE) {
			tmp_path =
			    kmalloc(strnlen(pTcon->treeName,
					    MAX_TREE_SIZE + 1) +
				    strnlen(search_path, MAX_PATHCONF) + 1,
				    GFP_KERNEL);
			if (tmp_path == NULL) {
				return -ENOMEM;
			}
        		/* have to skip first of the double backslash of
			   UNC name */
			strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
			strncat(tmp_path, search_path, MAX_PATHCONF);
			rc = connect_to_dfs_path(xid, pTcon->ses,
						 /* treename + */ tmp_path,
						 cifs_sb->local_nls);
			kfree(tmp_path);

			/* BB fix up inode etc. */
		} else if (rc) {
			return rc;
		}
	} else {
		struct cifsInodeInfo *cifsInfo;
		__u32 type = le32_to_cpu(findData.Type);
		__u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
		__u64 end_of_file = le64_to_cpu(findData.EndOfFile);

		/* get new inode */
		if (*pinode == NULL) {
			*pinode = new_inode(sb);
			if(*pinode == NULL) 
				return -ENOMEM;
			/* Is an i_ino of zero legal? */
			/* Are there sanity checks we can use to ensure that
			   the server is really filling in that field? */
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
				(*pinode)->i_ino =
					(unsigned long)findData.UniqueId;
			} /* note ino incremented to unique num in new_inode */
			insert_inode_hash(*pinode);
		}

		inode = *pinode;
		cifsInfo = CIFS_I(inode);

		cFYI(1, (" Old time %ld ", cifsInfo->time));
		cifsInfo->time = jiffies;
		cFYI(1, (" New time %ld ", cifsInfo->time));
		/* this is ok to set on every inode revalidate */
		atomic_set(&cifsInfo->inUse,1);

		inode->i_atime =
		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
		inode->i_mtime =
		    cifs_NTtimeToUnix(le64_to_cpu
				(findData.LastModificationTime));
		inode->i_ctime =
		    cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
		inode->i_mode = le64_to_cpu(findData.Permissions);
		if (type == UNIX_FILE) {
			inode->i_mode |= S_IFREG;
		} else if (type == UNIX_SYMLINK) {
			inode->i_mode |= S_IFLNK;
		} else if (type == UNIX_DIR) {
			inode->i_mode |= S_IFDIR;
		} else if (type == UNIX_CHARDEV) {
			inode->i_mode |= S_IFCHR;
			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
				le64_to_cpu(findData.DevMinor) & MINORMASK);
		} else if (type == UNIX_BLOCKDEV) {
			inode->i_mode |= S_IFBLK;
			inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
				le64_to_cpu(findData.DevMinor) & MINORMASK);
		} else if (type == UNIX_FIFO) {
			inode->i_mode |= S_IFIFO;
		} else if (type == UNIX_SOCKET) {
			inode->i_mode |= S_IFSOCK;
		}
		inode->i_uid = le64_to_cpu(findData.Uid);
		inode->i_gid = le64_to_cpu(findData.Gid);
		inode->i_nlink = le64_to_cpu(findData.Nlinks);

		if(is_size_safe_to_change(cifsInfo)) {
		/* can not safely change the file size here if the
		   client is writing to it due to potential races */

			i_size_write(inode, end_of_file);

		/* blksize needs to be multiple of two. So safer to default to
		blksize and blkbits set in superblock so 2**blkbits and blksize
		will match rather than setting to:
		(pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/

		/* This seems incredibly stupid but it turns out that i_blocks
		   is not related to (i_size / i_blksize), instead 512 byte size
		   is required for calculating num blocks */

		/* 512 bytes (2**9) is the fake blocksize that must be used */
		/* for this calculation */
			inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
		}

		if (num_of_bytes < end_of_file)
			cFYI(1, ("allocation size less than end of file "));
		cFYI(1,
		     ("Size %ld and blocks %ld",
		      (unsigned long) inode->i_size, inode->i_blocks));
		if (S_ISREG(inode->i_mode)) {
			cFYI(1, (" File inode "));
			inode->i_op = &cifs_file_inode_ops;
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
				inode->i_fop = &cifs_file_direct_ops;
			else
				inode->i_fop = &cifs_file_ops;
			inode->i_data.a_ops = &cifs_addr_ops;
		} else if (S_ISDIR(inode->i_mode)) {
			cFYI(1, (" Directory inode"));
			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		} else if (S_ISLNK(inode->i_mode)) {
			cFYI(1, (" Symbolic Link inode "));
			inode->i_op = &cifs_symlink_inode_ops;
		/* tmp_inode->i_fop = */ /* do not need to set to anything */
		} else {
			cFYI(1, (" Init special inode "));
			init_special_inode(inode, inode->i_mode,
					   inode->i_rdev);
		}
	}
	return rc;
}

int cifs_get_inode_info(struct inode **pinode,
	const unsigned char *search_path, FILE_ALL_INFO *pfindData,
	struct super_block *sb, int xid)
{
	int rc = 0;
	struct cifsTconInfo *pTcon;
	struct inode *inode;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *tmp_path;
	char *buf = NULL;

	pTcon = cifs_sb->tcon;
	cFYI(1,("Getting info on %s ", search_path));

	if((pfindData == NULL) && (*pinode != NULL)) {
		if(CIFS_I(*pinode)->clientCanCacheRead) {
			cFYI(1,("No need to revalidate cached inode sizes"));
			return rc;
		}
	}

	/* if file info not passed in then get it from server */
	if(pfindData == NULL) {
		buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
		if(buf == NULL)
			return -ENOMEM;
		pfindData = (FILE_ALL_INFO *)buf;
		/* could do find first instead but this returns more info */
		rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
			      cifs_sb->local_nls);
	}
	/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
	if (rc) {
		if (rc == -EREMOTE) {
			tmp_path =
			    kmalloc(strnlen
				    (pTcon->treeName,
				     MAX_TREE_SIZE + 1) +
				    strnlen(search_path, MAX_PATHCONF) + 1,
				    GFP_KERNEL);
			if (tmp_path == NULL) {
				kfree(buf);
				return -ENOMEM;
			}

			strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
			strncat(tmp_path, search_path, MAX_PATHCONF);
			rc = connect_to_dfs_path(xid, pTcon->ses,
						 /* treename + */ tmp_path,
						 cifs_sb->local_nls);
			kfree(tmp_path);
			/* BB fix up inode etc. */
		} else if (rc) {
			kfree(buf);
			return rc;
		}
	} else {
		struct cifsInodeInfo *cifsInfo;
		__u32 attr = le32_to_cpu(pfindData->Attributes);

		/* get new inode */
		if (*pinode == NULL) {
			*pinode = new_inode(sb);
			if (*pinode == NULL)
				return -ENOMEM;
			/* Is an i_ino of zero legal? Can we use that to check
			   if the server supports returning inode numbers?  Are
			   there other sanity checks we can use to ensure that
			   the server is really filling in that field? */

			/* We can not use the IndexNumber field by default from
			   Windows or Samba (in ALL_INFO buf) but we can request
			   it explicitly.  It may not be unique presumably if
			   the server has multiple devices mounted under one
			   share */

			/* There may be higher info levels that work but are
			   there Windows server or network appliances for which
			   IndexNumber field is not guaranteed unique? */

#ifdef CONFIG_CIFS_EXPERIMENTAL		
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
				int rc1 = 0;
				__u64 inode_num;

				rc1 = CIFSGetSrvInodeNumber(xid, pTcon, 
					search_path, &inode_num, 
					cifs_sb->local_nls);
				if(rc1) {
					cFYI(1,("GetSrvInodeNum rc %d", rc1));
					/* BB EOPNOSUPP disable SERVER_INUM? */
				} else /* do we need cast or hash to ino? */
					(*pinode)->i_ino = inode_num;
			} /* else ino incremented to unique num in new_inode*/
#endif /* CIFS_EXPERIMENTAL */
			insert_inode_hash(*pinode);
		}
		inode = *pinode;
		cifsInfo = CIFS_I(inode);
		cifsInfo->cifsAttrs = attr;
		cFYI(1, (" Old time %ld ", cifsInfo->time));
		cifsInfo->time = jiffies;
		cFYI(1, (" New time %ld ", cifsInfo->time));

		/* blksize needs to be multiple of two. So safer to default to
		blksize and blkbits set in superblock so 2**blkbits and blksize
		will match rather than setting to:
		(pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/

		/* Linux can not store file creation time unfortunately so we ignore it */
		inode->i_atime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
		inode->i_mtime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
		inode->i_ctime =
		    cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
		cFYI(0, (" Attributes came in as 0x%x ", attr));

		/* set default mode. will override for dirs below */
		if (atomic_read(&cifsInfo->inUse) == 0)
			/* new inode, can safely set these fields */
			inode->i_mode = cifs_sb->mnt_file_mode;

/*		if (attr & ATTR_REPARSE)  */
		/* We no longer handle these as symlinks because we could not
		   follow them due to the absolute path with drive letter */
		if (attr & ATTR_DIRECTORY) {
		/* override default perms since we do not do byte range locking
		   on dirs */
			inode->i_mode = cifs_sb->mnt_dir_mode;
			inode->i_mode |= S_IFDIR;
		} else {
			inode->i_mode |= S_IFREG;
			/* treat the dos attribute of read-only as read-only
			   mode e.g. 555 */
			if (cifsInfo->cifsAttrs & ATTR_READONLY)
				inode->i_mode &= ~(S_IWUGO);
		/* BB add code here -
		   validate if device or weird share or device type? */
		}
		if (is_size_safe_to_change(cifsInfo)) {
			/* can not safely change the file size here if the
			   client is writing to it due to potential races */
			i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));

			/* 512 bytes (2**9) is the fake blocksize that must be
			   used for this calculation */
			inode->i_blocks = (512 - 1 + le64_to_cpu(
					   pfindData->AllocationSize)) >> 9;
		}

		inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);

		/* BB fill in uid and gid here? with help from winbind? 
		   or retrieve from NTFS stream extended attribute */
		if (atomic_read(&cifsInfo->inUse) == 0) {
			inode->i_uid = cifs_sb->mnt_uid;
			inode->i_gid = cifs_sb->mnt_gid;
			/* set so we do not keep refreshing these fields with
			   bad data after user has changed them in memory */
			atomic_set(&cifsInfo->inUse,1);
		}

		if (S_ISREG(inode->i_mode)) {
			cFYI(1, (" File inode "));
			inode->i_op = &cifs_file_inode_ops;
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
				inode->i_fop = &cifs_file_direct_ops;
			else
				inode->i_fop = &cifs_file_ops;
			inode->i_data.a_ops = &cifs_addr_ops;
		} else if (S_ISDIR(inode->i_mode)) {
			cFYI(1, (" Directory inode "));
			inode->i_op = &cifs_dir_inode_ops;
			inode->i_fop = &cifs_dir_ops;
		} else if (S_ISLNK(inode->i_mode)) {
			cFYI(1, (" Symbolic Link inode "));
			inode->i_op = &cifs_symlink_inode_ops;
		} else {
			init_special_inode(inode, inode->i_mode,
					   inode->i_rdev);
		}
	}
	kfree(buf);
	return rc;
}

/* gets root inode */
void cifs_read_inode(struct inode *inode)
{
	int xid;
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(inode->i_sb);
	xid = GetXid();
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
	else
		cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
	/* can not call macro FreeXid here since in a void func */
	_FreeXid(xid);
}

int cifs_unlink(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;
	FILE_BASIC_INFO *pinfo_buf;

	cFYI(1, (" cifs_unlink, inode = 0x%p with ", inode));

	xid = GetXid();

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

	/* Unlink can be called from rename so we can not grab the sem here
	   since we deadlock otherwise */
/*	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;
	}
	rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls);

	if (!rc) {
		direntry->d_inode->i_nlink--;
	} else if (rc == -ENOENT) {
		d_drop(direntry);
	} else if (rc == -ETXTBSY) {
		int oplock = FALSE;
		__u16 netfid;

		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
				 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
				 &netfid, &oplock, NULL, cifs_sb->local_nls);
		if (rc==0) {
			CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
					      cifs_sb->local_nls);
			CIFSSMBClose(xid, pTcon, netfid);
			direntry->d_inode->i_nlink--;
		}
	} else if (rc == -EACCES) {
		/* try only if r/o attribute set in local lookup data? */
		pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
		if (pinfo_buf) {
			memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
			/* ATTRS set to normal clears r/o bit */
			pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
			if (!(pTcon->ses->flags & CIFS_SES_NT4))
				rc = CIFSSMBSetTimes(xid, pTcon, full_path,
						     pinfo_buf,
						     cifs_sb->local_nls);
			else
				rc = -EOPNOTSUPP;

			if (rc == -EOPNOTSUPP) {
				int oplock = FALSE;
				__u16 netfid;
			/*	rc = CIFSSMBSetAttrLegacy(xid, pTcon,
							  full_path,
							  (__u16)ATTR_NORMAL,
							  cifs_sb->local_nls); 
			   For some strange reason it seems that NT4 eats the
			   old setattr call without actually setting the
			   attributes so on to the third attempted workaround
			   */

			/* BB could scan to see if we already have it open
			   and pass in pid of opener to function */
				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, SYNCHRONIZE |
						 FILE_WRITE_ATTRIBUTES, 0,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls);
				if (rc==0) {
					rc = CIFSSMBSetFileTimes(xid, pTcon,
								 pinfo_buf,
								 netfid);
					CIFSSMBClose(xid, pTcon, netfid);
				}
			}
			kfree(pinfo_buf);
		}
		if (rc==0) {
			rc = CIFSSMBDelFile(xid, pTcon, full_path,
					    cifs_sb->local_nls);
			if (!rc) {
				direntry->d_inode->i_nlink--;
			} else if (rc == -ETXTBSY) {
				int oplock = FALSE;
				__u16 netfid;

				rc = CIFSSMBOpen(xid, pTcon, full_path,
						 FILE_OPEN, DELETE,
						 CREATE_NOT_DIR |
						 CREATE_DELETE_ON_CLOSE,
						 &netfid, &oplock, NULL,
						 cifs_sb->local_nls);
				if (rc==0) {
					CIFSSMBRenameOpenFile(xid, pTcon,
						netfid, NULL,
						cifs_sb->local_nls);
					CIFSSMBClose(xid, pTcon, netfid);
		                        direntry->d_inode->i_nlink--;
				}
			/* BB if rc = -ETXTBUSY goto the rename logic BB */
			}
		}
	}
	cifsInode = CIFS_I(direntry->d_inode);
	cifsInode->time = 0;	/* will force revalidate to get info when
				   needed */
	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
		current_fs_time(inode->i_sb);
	cifsInode = CIFS_I(inode);
	cifsInode->time = 0;	/* force revalidate of dir as well */

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

int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p ", mode, inode));

	xid = GetXid();

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

	down(&inode->i_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&inode->i_sb->s_vfs_rename_sem);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* BB add setting the equivalent of mode via CreateX w/ACLs */
	rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls);
	if (rc) {
		cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
		d_drop(direntry);
	} else {
		inode->i_nlink++;
		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, NULL,
						 inode->i_sb,xid);

		direntry->d_op = &cifs_dentry_ops;
		d_instantiate(direntry, newinode);
		if (direntry->d_inode)
			direntry->d_inode->i_nlink = 2;
		if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path,
						    mode,
						    (__u64)current->euid,
						    (__u64)current->egid,
						    0 /* dev_t */,
						    cifs_sb->local_nls);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path,
						    mode, (__u64)-1,
						    (__u64)-1, 0 /* dev_t */,
						    cifs_sb->local_nls);
			}
		else {
			/* BB to be implemented via Windows secrty descriptors
			   eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
						 -1, -1, local_nls); */
		}
	}
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_rmdir(struct inode *inode, struct dentry *direntry)
{
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct cifsInodeInfo *cifsInode;

	cFYI(1, (" cifs_rmdir, inode = 0x%p with ", inode));

	xid = GetXid();

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

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

	rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls);

	if (!rc) {
		inode->i_nlink--;
		i_size_write(direntry->d_inode,0);
		direntry->d_inode->i_nlink = 0;
	}

	cifsInode = CIFS_I(direntry->d_inode);
	cifsInode->time = 0;	/* force revalidate to go get info when
				   needed */
	direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
		current_fs_time(inode->i_sb);

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

int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
	struct inode *target_inode, struct dentry *target_direntry)
{
	char *fromName;
	char *toName;
	struct cifs_sb_info *cifs_sb_source;
	struct cifs_sb_info *cifs_sb_target;
	struct cifsTconInfo *pTcon;
	int xid;
	int rc = 0;

	xid = GetXid();

	cifs_sb_target = CIFS_SB(target_inode->i_sb);
	cifs_sb_source = CIFS_SB(source_inode->i_sb);
	pTcon = cifs_sb_source->tcon;

	if (pTcon != cifs_sb_target->tcon) {
		FreeXid(xid);
		return -EXDEV;	/* BB actually could be allowed if same server,
				   but different share.
				   Might eventually add support for this */
	}

	/* we already  have the rename sem so we do not need to grab it again
	   here to protect the path integrity */
	fromName = build_path_from_dentry(source_direntry);
	toName = build_path_from_dentry(target_direntry);
	if ((fromName == NULL) || (toName == NULL)) {
		rc = -ENOMEM;
		goto cifs_rename_exit;
	}

	rc = CIFSSMBRename(xid, pTcon, fromName, toName,
			   cifs_sb_source->local_nls);
	if (rc == -EEXIST) {
		/* check if they are the same file because rename of hardlinked
		   files is a noop */
		FILE_UNIX_BASIC_INFO *info_buf_source;
		FILE_UNIX_BASIC_INFO *info_buf_target;

		info_buf_source =
			kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
		if (info_buf_source != NULL) {
			info_buf_target = info_buf_source + 1;
			rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
				info_buf_source, cifs_sb_source->local_nls);
			if (rc == 0) {
				rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
						info_buf_target,
						cifs_sb_target->local_nls);
			}
			if ((rc == 0) &&
			    (info_buf_source->UniqueId ==
			     info_buf_target->UniqueId)) {
			/* do not rename since the files are hardlinked which
			   is a noop */
			} else {
			/* we either can not tell the files are hardlinked
			   (as with Windows servers) or files are not
			   hardlinked so delete the target manually before
			   renaming to follow POSIX rather than Windows
			   semantics */
				cifs_unlink(target_inode, target_direntry);
				rc = CIFSSMBRename(xid, pTcon, fromName,
						   toName,
						   cifs_sb_source->local_nls);
			}
			kfree(info_buf_source);
		} /* if we can not get memory just leave rc as EEXIST */
	}

	if (rc) {
		cFYI(1, ("rename rc %d", rc));
	}

	if ((rc == -EIO) || (rc == -EEXIST)) {
		int oplock = FALSE;
		__u16 netfid;

		/* BB FIXME Is Generic Read correct for rename? */
		/* if renaming directory - we should not say CREATE_NOT_DIR,
		   need to test renaming open directory, also GENERIC_READ
		   might not right be right access to request */
		rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
				 CREATE_NOT_DIR, &netfid, &oplock, NULL,
				 cifs_sb_source->local_nls);
		if (rc==0) {
			CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
					      cifs_sb_source->local_nls);
			CIFSSMBClose(xid, pTcon, netfid);
		}
	}

cifs_rename_exit:
	kfree(fromName);
	kfree(toName);
	FreeXid(xid);
	return rc;
}

int cifs_revalidate(struct dentry *direntry)
{
	int xid;
	int rc = 0;
	char *full_path;
	struct cifs_sb_info *cifs_sb;
	struct cifsInodeInfo *cifsInode;
	loff_t local_size;
	struct timespec local_mtime;
	int invalidate_inode = FALSE;

	if (direntry->d_inode == NULL)
		return -ENOENT;

	cifsInode = CIFS_I(direntry->d_inode);

	if (cifsInode == NULL)
		return -ENOENT;

	/* no sense revalidating inode info on file that no one can write */
	if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
		return rc;

	xid = GetXid();

	cifs_sb = CIFS_SB(direntry->d_sb);

	/* can not safely grab the rename sem here if rename calls revalidate
	   since that would deadlock */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
		 "jiffies %ld", full_path, direntry->d_inode,
		 direntry->d_inode->i_count.counter, direntry,
		 direntry->d_time, jiffies));

	if (cifsInode->time == 0) {
		/* was set to zero previously to force revalidate */
	} else if (time_before(jiffies, cifsInode->time + HZ) &&
		   lookupCacheEnabled) {
		if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
		    (direntry->d_inode->i_nlink == 1)) {
			kfree(full_path);
			FreeXid(xid);
			return rc;
		} else {
			cFYI(1, ("Have to revalidate file due to hardlinks"));
		}
	}

	/* save mtime and size */
	local_mtime = direntry->d_inode->i_mtime;
	local_size = direntry->d_inode->i_size;

	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
		rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
					      direntry->d_sb,xid);
		if (rc) {
			cFYI(1, ("error on getting revalidate info %d", rc));
/*			if (rc != -ENOENT)
				rc = 0; */	/* BB should we cache info on
						   certain errors? */
		}
	} else {
		rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
					 direntry->d_sb,xid);
		if (rc) {
			cFYI(1, ("error on getting revalidate info %d", rc));
/*			if (rc != -ENOENT)
				rc = 0; */	/* BB should we cache info on
						   certain errors? */
		}
	}
	/* should we remap certain errors, access denied?, to zero */

	/* if not oplocked, we invalidate inode pages if mtime or file size
	   had changed on server */

	if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) && 
	    (local_size == direntry->d_inode->i_size)) {
		cFYI(1, ("cifs_revalidate - inode unchanged"));
	} else {
		/* file may have changed on server */
		if (cifsInode->clientCanCacheRead) {
			/* no need to invalidate inode pages since we were the
			   only ones who could have modified the file and the
			   server copy is staler than ours */
		} else {
			invalidate_inode = TRUE;
		}
	}

	/* can not grab this sem since kernel filesys locking documentation
	   indicates i_sem may be taken by the kernel on lookup and rename
	   which could deadlock if we grab the i_sem here as well */
/*	down(&direntry->d_inode->i_sem);*/
	/* need to write out dirty pages here  */
	if (direntry->d_inode->i_mapping) {
		/* do we need to lock inode until after invalidate completes
		   below? */
		filemap_fdatawrite(direntry->d_inode->i_mapping);
	}
	if (invalidate_inode) {
		if (direntry->d_inode->i_mapping)
			filemap_fdatawait(direntry->d_inode->i_mapping);
		/* may eventually have to do this for open files too */
		if (list_empty(&(cifsInode->openFileList))) {
			/* Has changed on server - flush read ahead pages */
			cFYI(1, ("Invalidating read ahead data on "
				 "closed file"));
			invalidate_remote_inode(direntry->d_inode);
		}
	}
/*	up(&direntry->d_inode->i_sem); */
	
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
	struct kstat *stat)
{
	int err = cifs_revalidate(dentry);
	if (!err)
		generic_fillattr(dentry->d_inode, stat);
	return err;
}

static int cifs_truncate_page(struct address_space *mapping, loff_t from)
{
	pgoff_t index = from >> PAGE_CACHE_SHIFT;
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;
	char *kaddr;
	int rc = 0;

	page = grab_cache_page(mapping, index);
	if (!page)
		return -ENOMEM;

	kaddr = kmap_atomic(page, KM_USER0);
	memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
	flush_dcache_page(page);
	kunmap_atomic(kaddr, KM_USER0);
	unlock_page(page);
	page_cache_release(page);
	return rc;
}

int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
{
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	int rc = -EACCES;
	int found = FALSE;
	struct cifsFileInfo *open_file = NULL;
	FILE_BASIC_INFO time_buf;
	int set_time = FALSE;
	__u64 mode = 0xFFFFFFFFFFFFFFFFULL;
	__u64 uid = 0xFFFFFFFFFFFFFFFFULL;
	__u64 gid = 0xFFFFFFFFFFFFFFFFULL;
	struct cifsInodeInfo *cifsInode;
	struct list_head *tmp;

	xid = GetXid();

	cFYI(1, (" In cifs_setattr, name = %s attrs->iavalid 0x%x ",
		 direntry->d_name.name, attrs->ia_valid));
	cifs_sb = CIFS_SB(direntry->d_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;
	}
	cifsInode = CIFS_I(direntry->d_inode);

	/* BB check if we need to refresh inode from server now ? BB */

	/* need to flush data before changing file size on server */
	filemap_fdatawrite(direntry->d_inode->i_mapping);
	filemap_fdatawait(direntry->d_inode->i_mapping);

	if (attrs->ia_valid & ATTR_SIZE) {
		read_lock(&GlobalSMBSeslock);
		/* To avoid spurious oplock breaks from server, in the case of
		   inodes that we already have open, avoid doing path based
		   setting of file size if we can do it by handle.
		   This keeps our caching token (oplock) and avoids timeouts
		   when the local oplock break takes longer to flush
		   writebehind data than the SMB timeout for the SetPathInfo
		   request would allow */
		list_for_each(tmp, &cifsInode->openFileList) {
			open_file = list_entry(tmp, struct cifsFileInfo,
					       flist);
			/* We check if file is open for writing first */
			if ((open_file->pfile) &&
			    ((open_file->pfile->f_flags & O_RDWR) ||
			    (open_file->pfile->f_flags & O_WRONLY))) {
				if (open_file->invalidHandle == FALSE) {
					/* we found a valid, writeable network
					   file handle to use to try to set the
					   file size */
					__u16 nfid = open_file->netfid;
					__u32 npid = open_file->pid;
					read_unlock(&GlobalSMBSeslock);
					found = TRUE;
					rc = CIFSSMBSetFileSize(xid, pTcon,
						attrs->ia_size, nfid, npid,
						FALSE);
					cFYI(1, ("SetFileSize by handle "
						 "(setattrs) rc = %d", rc));
					/* Do not need reopen and retry on
					   EAGAIN since we will retry by
					   pathname below */

					/* now that we found one valid file
					   handle no sense continuing to loop
					   trying others, so break here */
					break;
				}
			}
		}
		if (found == FALSE)
			read_unlock(&GlobalSMBSeslock);

		if (rc != 0) {
			/* Set file size by pathname rather than by handle
			   either because no valid, writeable file handle for
			   it was found or because there was an error setting
			   it by handle */
			rc = CIFSSMBSetEOF(xid, pTcon, full_path,
					   attrs->ia_size, FALSE,
					   cifs_sb->local_nls);
			cFYI(1, (" SetEOF by path (setattrs) rc = %d", rc));
		}

		/* Server is ok setting allocation size implicitly - no need
		   to call:
		CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
			 cifs_sb->local_nls);
		   */

		if (rc == 0) {
			rc = vmtruncate(direntry->d_inode, attrs->ia_size);
			cifs_truncate_page(direntry->d_inode->i_mapping,
					   direntry->d_inode->i_size);
		}
	}
	if (attrs->ia_valid & ATTR_UID) {
		cFYI(1, (" CIFS - UID changed to %d", attrs->ia_uid));
		uid = attrs->ia_uid;
		/* entry->uid = cpu_to_le16(attr->ia_uid); */
	}
	if (attrs->ia_valid & ATTR_GID) {
		cFYI(1, (" CIFS - GID changed to %d", attrs->ia_gid));
		gid = attrs->ia_gid;
		/* entry->gid = cpu_to_le16(attr->ia_gid); */
	}

	time_buf.Attributes = 0;
	if (attrs->ia_valid & ATTR_MODE) {
		cFYI(1, (" CIFS - Mode changed to 0x%x", attrs->ia_mode));
		mode = attrs->ia_mode;
		/* entry->mode = cpu_to_le16(attr->ia_mode); */
	}

	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
	    && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
		rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
					 0 /* dev_t */, cifs_sb->local_nls);
	else if (attrs->ia_valid & ATTR_MODE) {
		if ((mode & S_IWUGO) == 0) /* not writeable */ {
			if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
				time_buf.Attributes =
					cpu_to_le32(cifsInode->cifsAttrs |
						    ATTR_READONLY);
		} else if ((mode & S_IWUGO) == S_IWUGO) {
			if (cifsInode->cifsAttrs & ATTR_READONLY)
				time_buf.Attributes =
					cpu_to_le32(cifsInode->cifsAttrs &
						    (~ATTR_READONLY));
		}
		/* BB to be implemented -
		   via Windows security descriptors or streams */
		/* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
				      cifs_sb->local_nls); */
	}

	if (attrs->ia_valid & ATTR_ATIME) {
		set_time = TRUE;
		time_buf.LastAccessTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
	} else
		time_buf.LastAccessTime = 0;

	if (attrs->ia_valid & ATTR_MTIME) {
		set_time = TRUE;
		time_buf.LastWriteTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
	} else
		time_buf.LastWriteTime = 0;

	if (attrs->ia_valid & ATTR_CTIME) {
		set_time = TRUE;
		cFYI(1, (" CIFS - CTIME changed ")); /* BB probably no need */
		time_buf.ChangeTime =
		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
	} else
		time_buf.ChangeTime = 0;

	if (set_time || time_buf.Attributes) {
		/* BB what if setting one attribute fails (such as size) but
		   time setting works? */
		time_buf.CreationTime = 0;	/* do not change */
		/* In the future we should experiment - try setting timestamps
		   via Handle (SetFileInfo) instead of by path */
		if (!(pTcon->ses->flags & CIFS_SES_NT4))
			rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
					     cifs_sb->local_nls);
		else
			rc = -EOPNOTSUPP;

		if (rc == -EOPNOTSUPP) {
			int oplock = FALSE;
			__u16 netfid;

			cFYI(1, ("calling SetFileInfo since SetPathInfo for "
				 "times not supported by this server"));
			/* BB we could scan to see if we already have it open
			   and pass in pid of opener to function */
			rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
					 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
					 CREATE_NOT_DIR, &netfid, &oplock,
					 NULL, cifs_sb->local_nls);
			if (rc==0) {
				rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
							 netfid);
				CIFSSMBClose(xid, pTcon, netfid);
			} else {
			/* BB For even older servers we could convert time_buf
			   into old DOS style which uses two second
			   granularity */

			/* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
        	        		&time_buf, cifs_sb->local_nls); */
			}
		}
	}

	/* do not need local check to inode_check_ok since the server does
	   that */
	if (!rc)
		rc = inode_setattr(direntry->d_inode, attrs);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

void cifs_delete_inode(struct inode *inode)
{
	cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
	/* may have to add back in if and when safe distributed caching of
	   directories added e.g. via FindNotify */
}