/*
   *   fs/cifs/readdir.c
   *
   *   Directory search handling

   *

   *   Copyright (C) International Business Machines  Corp., 2004, 2008

   *   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/pagemap.h>

  #include <linux/slab.h>

  #include <linux/stat.h>

  #include "cifspdu.h"
  #include "cifsglob.h"
  #include "cifsproto.h"
  #include "cifs_unicode.h"
  #include "cifs_debug.h"
  #include "cifs_fs_sb.h"
  #include "cifsfs.h"

  /*
   * To be safe - for UCS to UTF-8 with strings loaded with the rare long
   * characters alloc more to account for such multibyte target UTF-8
   * characters.
   */
  #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)

  #ifdef CONFIG_CIFS_DEBUG2
  static void dump_cifs_file_struct(struct file *file, char *label)

  {

  	struct cifsFileInfo *cf;

  	if (file) {

  		cf = file->private_data;

  		if (cf == NULL) {

  			cFYI(1, "empty cifs private file data");

  			return;
  		}

  		if (cf->invalidHandle)

  			cFYI(1, "invalid handle");

  		if (cf->srch_inf.endOfSearch)

  			cFYI(1, "end of search");

  		if (cf->srch_inf.emptyDir)

  			cFYI(1, "empty dir");

  	}

  }

  #else
  static inline void dump_cifs_file_struct(struct file *file, char *label)
  {
  }

  #endif /* DEBUG2 */

  /*
   * Find the dentry that matches "name". If there isn't one, create one. If it's
   * a negative dentry or the uniqueid changed, then drop it and recreate it.
   */
  static struct dentry *
  cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
  		    struct cifs_fattr *fattr)
  {
  	struct dentry *dentry, *alias;
  	struct inode *inode;
  	struct super_block *sb = parent->d_inode->i_sb;

  	cFYI(1, "For %s", name->name);

  	if (parent->d_op && parent->d_op->d_hash)
  		parent->d_op->d_hash(parent, name);
  	else
  		name->hash = full_name_hash(name->name, name->len);

  	dentry = d_lookup(parent, name);
  	if (dentry) {
  		/* FIXME: check for inode number changes? */
  		if (dentry->d_inode != NULL)
  			return dentry;
  		d_drop(dentry);
  		dput(dentry);
  	}
  
  	dentry = d_alloc(parent, name);
  	if (dentry == NULL)
  		return NULL;
  
  	inode = cifs_iget(sb, fattr);
  	if (!inode) {
  		dput(dentry);
  		return NULL;
  	}
  
  	if (CIFS_SB(sb)->tcon->nocase)
  		dentry->d_op = &cifs_ci_dentry_ops;
  	else
  		dentry->d_op = &cifs_dentry_ops;
  
  	alias = d_materialise_unique(dentry, inode);
  	if (alias != NULL) {
  		dput(dentry);
  		if (IS_ERR(alias))
  			return NULL;
  		dentry = alias;
  	}
  
  	return dentry;
  }

  static void
  cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)

  {

  	fattr->cf_uid = cifs_sb->mnt_uid;
  	fattr->cf_gid = cifs_sb->mnt_gid;

  	if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
  		fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
  		fattr->cf_dtype = DT_DIR;

  	} else {

  		fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
  		fattr->cf_dtype = DT_REG;

  	}

  	if (fattr->cf_cifsattrs & ATTR_READONLY)
  		fattr->cf_mode &= ~S_IWUGO;

  	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
  	    fattr->cf_cifsattrs & ATTR_SYSTEM) {
  		if (fattr->cf_eof == 0)  {
  			fattr->cf_mode &= ~S_IFMT;
  			fattr->cf_mode |= S_IFIFO;
  			fattr->cf_dtype = DT_FIFO;

  		} else {

  			/*

  			 * trying to get the type and mode via SFU can be slow,
  			 * so just call those regular files for now, and mark
  			 * for reval

  			 */

  			fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;

  		}
  	}

  }

  static void

  cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
  		       struct cifs_sb_info *cifs_sb)
  {
  	memset(fattr, 0, sizeof(*fattr));
  	fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
  	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
  	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
  	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
  	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
  	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
  
  	cifs_fill_common_info(fattr, cifs_sb);
  }

  static void

  cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
  		       struct cifs_sb_info *cifs_sb)
  {
  	int offset = cifs_sb->tcon->ses->server->timeAdj;

  	memset(fattr, 0, sizeof(*fattr));
  	fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
  					    info->LastAccessTime, offset);
  	fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
  					    info->LastWriteTime, offset);
  	fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
  					    info->LastWriteTime, offset);
  
  	fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
  	fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
  	fattr->cf_eof = le32_to_cpu(info->DataSize);
  
  	cifs_fill_common_info(fattr, cifs_sb);

  }

  /* BB eventually need to add the following helper function to
        resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
        we try to do FindFirst on (NTFS) directory symlinks */
  /*
  int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
  			     int xid)
  {
  	__u16 fid;
  	int len;
  	int oplock = 0;
  	int rc;
  	struct cifsTconInfo *ptcon = cifs_sb->tcon;
  	char *tmpbuffer;
  
  	rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
  			OPEN_REPARSE_POINT, &fid, &oplock, NULL,
  			cifs_sb->local_nls,
  			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
  	if (!rc) {
  		tmpbuffer = kmalloc(maxpath);
  		rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
  				tmpbuffer,
  				maxpath -1,
  				fid,
  				cifs_sb->local_nls);
  		if (CIFSSMBClose(xid, ptcon, fid)) {

  			cFYI(1, "Error closing temporary reparsepoint open");

  		}
  	}
  }
   */

  static int initiate_cifs_search(const int xid, struct file *file)
  {
  	int rc = 0;

  	char *full_path;
  	struct cifsFileInfo *cifsFile;

  	struct cifs_sb_info *cifs_sb;
  	struct cifsTconInfo *pTcon;

  	if (file->private_data == NULL) {

  		file->private_data =
  			kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);

  	}

  	if (file->private_data == NULL)

  		return -ENOMEM;

  	cifsFile = file->private_data;

  	cifsFile->invalidHandle = true;
  	cifsFile->srch_inf.endOfSearch = false;

  	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);

  	if (cifs_sb == NULL)

  		return -EINVAL;
  
  	pTcon = cifs_sb->tcon;

  	if (pTcon == NULL)

  		return -EINVAL;

  	full_path = build_path_from_dentry(file->f_path.dentry);

  	if (full_path == NULL)

  		return -ENOMEM;

  	cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);

  ffirst_retry:

  	/* test for Unix extensions */

  	/* but now check for them on the share/mount not on the SMB session */
  /*	if (pTcon->ses->capabilities & CAP_UNIX) { */

  	if (pTcon->unix_ext)

  		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;

  	else if ((pTcon->ses->capabilities &

  			(CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
  		cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;

  	} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
  		cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
  	} else /* not srvinos - BB fixme add check for backlevel? */ {
  		cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
  	}

  	rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,

  		&cifsFile->netfid, &cifsFile->srch_inf,

  		cifs_sb->mnt_cifs_flags &

  			CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));

  	if (rc == 0)

  		cifsFile->invalidHandle = false;

  	/* BB add following call to handle readdir on new NTFS symlink errors

  	else if STATUS_STOPPED_ON_SYMLINK
  		call get_symlink_reparse_path and retry with new path */
  	else if ((rc == -EOPNOTSUPP) &&

  		(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
  		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
  		goto ffirst_retry;
  	}

  	kfree(full_path);
  	return rc;
  }
  
  /* return length of unicode string in bytes */
  static int cifs_unicode_bytelen(char *str)
  {
  	int len;

  	__le16 *ustr = (__le16 *)str;

  	for (len = 0; len <= PATH_MAX; len++) {

  		if (ustr[len] == 0)

  			return len << 1;
  	}

  	cFYI(1, "Unicode string longer than PATH_MAX found");

  	return len << 1;
  }

  static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)

  {

  	char *new_entry;

  	FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;

  	if (level == SMB_FIND_FILE_INFO_STANDARD) {

  		FIND_FILE_STANDARD_INFO *pfData;

  		pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
  
  		new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
  				pfData->FileNameLength;
  	} else
  		new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);

  	cFYI(1, "new entry %p old entry %p", new_entry, old_entry);

  	/* validate that new_entry is not past end of SMB */

  	if (new_entry >= end_of_smb) {

  		cERROR(1, "search entry %p began after end of SMB %p old entry %p",
  			new_entry, end_of_smb, old_entry);

  		return NULL;

  	} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&

  		    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
  		  || ((level != SMB_FIND_FILE_INFO_STANDARD) &&

  		   (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {

  		cERROR(1, "search entry %p extends after end of SMB %p",
  			new_entry, end_of_smb);

  		return NULL;

  	} else

  		return new_entry;
  
  }
  
  #define UNICODE_DOT cpu_to_le16(0x2e)
  
  /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
  static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
  {
  	int rc = 0;

  	char *filename = NULL;
  	int len = 0;

  	if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {

  		FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;

  		filename = &pFindData->FileName[0];

  		if (cfile->srch_inf.unicode) {

  			len = cifs_unicode_bytelen(filename);
  		} else {
  			/* BB should we make this strnlen of PATH_MAX? */
  			len = strnlen(filename, 5);
  		}

  	} else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {

  		FILE_DIRECTORY_INFO *pFindData =

  			(FILE_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (cfile->srch_inf.info_level ==

  			SMB_FIND_FILE_FULL_DIRECTORY_INFO) {

  		FILE_FULL_DIRECTORY_INFO *pFindData =

  			(FILE_FULL_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (cfile->srch_inf.info_level ==

  			SMB_FIND_FILE_ID_FULL_DIR_INFO) {

  		SEARCH_ID_FULL_DIR_INFO *pFindData =

  			(SEARCH_ID_FULL_DIR_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (cfile->srch_inf.info_level ==

  			SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {

  		FILE_BOTH_DIRECTORY_INFO *pFindData =

  			(FILE_BOTH_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {

  		FIND_FILE_STANDARD_INFO *pFindData =

  			(FIND_FILE_STANDARD_INFO *)current_entry;
  		filename = &pFindData->FileName[0];

  		len = pFindData->FileNameLength;

  	} else {

  		cFYI(1, "Unknown findfirst level %d",
  			 cfile->srch_inf.info_level);

  	}

  	if (filename) {
  		if (cfile->srch_inf.unicode) {

  			__le16 *ufilename = (__le16 *)filename;

  			if (len == 2) {

  				/* check for . */

  				if (ufilename[0] == UNICODE_DOT)

  					rc = 1;

  			} else if (len == 4) {

  				/* check for .. */

  				if ((ufilename[0] == UNICODE_DOT)

  				   && (ufilename[1] == UNICODE_DOT))

  					rc = 2;
  			}
  		} else /* ASCII */ {

  			if (len == 1) {

  				if (filename[0] == '.')

  					rc = 1;

  			} else if (len == 2) {

  				if ((filename[0] == '.') && (filename[1] == '.'))

  					rc = 2;
  			}
  		}
  	}
  
  	return rc;
  }

  /* Check if directory that we are searching has changed so we can decide
     whether we can use the cached search results from the previous search */

  static int is_dir_changed(struct file *file)

  {

  	struct inode *inode = file->f_path.dentry->d_inode;
  	struct cifsInodeInfo *cifsInfo = CIFS_I(inode);

  	if (cifsInfo->time == 0)

  		return 1; /* directory was changed, perhaps due to unlink */
  	else
  		return 0;
  
  }

  static int cifs_save_resume_key(const char *current_entry,
  	struct cifsFileInfo *cifsFile)
  {
  	int rc = 0;
  	unsigned int len = 0;
  	__u16 level;
  	char *filename;
  
  	if ((cifsFile == NULL) || (current_entry == NULL))
  		return -EINVAL;
  
  	level = cifsFile->srch_inf.info_level;
  
  	if (level == SMB_FIND_FILE_UNIX) {
  		FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
  
  		filename = &pFindData->FileName[0];
  		if (cifsFile->srch_inf.unicode) {
  			len = cifs_unicode_bytelen(filename);
  		} else {
  			/* BB should we make this strnlen of PATH_MAX? */
  			len = strnlen(filename, PATH_MAX);
  		}
  		cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
  	} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
  		FILE_DIRECTORY_INFO *pFindData =
  			(FILE_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);
  		cifsFile->srch_inf.resume_key = pFindData->FileIndex;
  	} else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
  		FILE_FULL_DIRECTORY_INFO *pFindData =
  			(FILE_FULL_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);
  		cifsFile->srch_inf.resume_key = pFindData->FileIndex;
  	} else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
  		SEARCH_ID_FULL_DIR_INFO *pFindData =
  			(SEARCH_ID_FULL_DIR_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);
  		cifsFile->srch_inf.resume_key = pFindData->FileIndex;
  	} else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
  		FILE_BOTH_DIRECTORY_INFO *pFindData =
  			(FILE_BOTH_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);
  		cifsFile->srch_inf.resume_key = pFindData->FileIndex;
  	} else if (level == SMB_FIND_FILE_INFO_STANDARD) {
  		FIND_FILE_STANDARD_INFO *pFindData =
  			(FIND_FILE_STANDARD_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		/* one byte length, no name conversion */
  		len = (unsigned int)pFindData->FileNameLength;
  		cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
  	} else {

  		cFYI(1, "Unknown findfirst level %d", level);

  		return -EINVAL;
  	}
  	cifsFile->srch_inf.resume_name_len = len;
  	cifsFile->srch_inf.presume_name = filename;
  	return rc;
  }

  /* find the corresponding entry in the search */
  /* Note that the SMB server returns search entries for . and .. which
     complicates logic here if we choose to parse for them and we do not
     assume that they are located in the findfirst return buffer.*/
  /* We start counting in the buffer with entry 2 and increment for every
     entry (do not increment for . or .. entry) */
  static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,

  	struct file *file, char **ppCurrentEntry, int *num_to_ret)

  {
  	int rc = 0;
  	int pos_in_buf = 0;
  	loff_t first_entry_in_buffer;
  	loff_t index_to_find = file->f_pos;

  	struct cifsFileInfo *cifsFile = file->private_data;

  	/* check if index in the buffer */

  	if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||

  	   (num_to_ret == NULL))

  		return -ENOENT;

  	*ppCurrentEntry = NULL;

  	first_entry_in_buffer =
  		cifsFile->srch_inf.index_of_last_entry -

  			cifsFile->srch_inf.entries_in_buffer;

  
  	/* if first entry in buf is zero then is first buffer
  	in search response data which means it is likely . and ..
  	will be in this buffer, although some servers do not return
  	. and .. for the root of a drive and for those we need
  	to start two entries earlier */

  	dump_cifs_file_struct(file, "In fce ");

  	if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
  	     is_dir_changed(file)) ||

  	   (index_to_find < first_entry_in_buffer)) {

  		/* close and restart search */

  		cFYI(1, "search backing up - close and restart search");

  		write_lock(&GlobalSMBSeslock);

  		if (!cifsFile->srch_inf.endOfSearch &&
  		    !cifsFile->invalidHandle) {
  			cifsFile->invalidHandle = true;

  			write_unlock(&GlobalSMBSeslock);

  			CIFSFindClose(xid, pTcon, cifsFile->netfid);

  		} else
  			write_unlock(&GlobalSMBSeslock);

  		if (cifsFile->srch_inf.ntwrk_buf_start) {

  			cFYI(1, "freeing SMB ff cache buf on search rewind");

  			if (cifsFile->srch_inf.smallBuf)

  				cifs_small_buf_release(cifsFile->srch_inf.
  						ntwrk_buf_start);
  			else
  				cifs_buf_release(cifsFile->srch_inf.
  						ntwrk_buf_start);

  			cifsFile->srch_inf.ntwrk_buf_start = NULL;

  		}

  		rc = initiate_cifs_search(xid, file);

  		if (rc) {

  			cFYI(1, "error %d reinitiating a search on rewind",
  				 rc);

  			return rc;
  		}

  		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);

  	}

  	while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&

  	      (rc == 0) && !cifsFile->srch_inf.endOfSearch) {

  		cFYI(1, "calling findnext2");

  		rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,

  				  &cifsFile->srch_inf);

  		cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);

  		if (rc)

  			return -ENOENT;
  	}

  	if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {

  		/* we found the buffer that contains the entry */
  		/* scan and find it */
  		int i;

  		char *current_entry;
  		char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +

  			smbCalcSize((struct smb_hdr *)
  				cifsFile->srch_inf.ntwrk_buf_start);

  
  		current_entry = cifsFile->srch_inf.srch_entries_start;

  		first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
  					- cifsFile->srch_inf.entries_in_buffer;
  		pos_in_buf = index_to_find - first_entry_in_buffer;

  		cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);

  		for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {

  			/* go entry by entry figuring out which is first */

  			current_entry = nxt_dir_entry(current_entry, end_of_smb,

  						cifsFile->srch_inf.info_level);

  		}

  		if ((current_entry == NULL) && (i < pos_in_buf)) {

  			/* BB fixme - check if we should flag this error */

  			cERROR(1, "reached end of buf searching for pos in buf"

  			  " %d index to find %lld rc %d",

  			  pos_in_buf, index_to_find, rc);

  		}
  		rc = 0;
  		*ppCurrentEntry = current_entry;
  	} else {

  		cFYI(1, "index not in buffer - could not findnext into it");

  		return 0;
  	}

  	if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {

  		cFYI(1, "can not return entries pos_in_buf beyond last");

  		*num_to_ret = 0;
  	} else
  		*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;

  
  	return rc;
  }
  
  /* inode num, inode type and filename returned */
  static int cifs_get_name_from_search_buf(struct qstr *pqst,
  	char *current_entry, __u16 level, unsigned int unicode,

  	struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum)

  {
  	int rc = 0;
  	unsigned int len = 0;

  	char *filename;
  	struct nls_table *nlt = cifs_sb->local_nls;

  
  	*pinum = 0;

  	if (level == SMB_FIND_FILE_UNIX) {

  		FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;

  
  		filename = &pFindData->FileName[0];

  		if (unicode) {

  			len = cifs_unicode_bytelen(filename);
  		} else {
  			/* BB should we make this strnlen of PATH_MAX? */
  			len = strnlen(filename, PATH_MAX);
  		}

  		*pinum = le64_to_cpu(pFindData->basic.UniqueId);

  	} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {

  		FILE_DIRECTORY_INFO *pFindData =

  			(FILE_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {

  		FILE_FULL_DIRECTORY_INFO *pFindData =

  			(FILE_FULL_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {

  		SEARCH_ID_FULL_DIR_INFO *pFindData =

  			(SEARCH_ID_FULL_DIR_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  		*pinum = le64_to_cpu(pFindData->UniqueId);

  	} else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {

  		FILE_BOTH_DIRECTORY_INFO *pFindData =

  			(FILE_BOTH_DIRECTORY_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		len = le32_to_cpu(pFindData->FileNameLength);

  	} else if (level == SMB_FIND_FILE_INFO_STANDARD) {

  		FIND_FILE_STANDARD_INFO *pFindData =

  			(FIND_FILE_STANDARD_INFO *)current_entry;
  		filename = &pFindData->FileName[0];
  		/* one byte length, no name conversion */
  		len = (unsigned int)pFindData->FileNameLength;

  	} else {

  		cFYI(1, "Unknown findfirst level %d", level);

  		return -EINVAL;
  	}

  	if (len > max_len) {

  		cERROR(1, "bad search response length %d past smb end", len);

  		return -EINVAL;
  	}

  	if (unicode) {

  		pqst->len = cifs_from_ucs2((char *) pqst->name,
  					   (__le16 *) filename,

  					   UNICODE_NAME_MAX,
  					   min(len, max_len), nlt,

  					   cifs_sb->mnt_cifs_flags &
  						CIFS_MOUNT_MAP_SPECIAL_CHR);

  		pqst->len -= nls_nullsize(nlt);

  	} else {
  		pqst->name = filename;
  		pqst->len = len;
  	}

  	return rc;
  }

  static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
  			void *direntry, char *scratch_buf, unsigned int max_len)

  {
  	int rc = 0;
  	struct qstr qstring;

  	struct cifsFileInfo *pCifsF;

  	u64    inum;

  	ino_t  ino;

  	struct super_block *sb;

  	struct cifs_sb_info *cifs_sb;

  	struct dentry *tmp_dentry;

  	struct cifs_fattr fattr;

  
  	/* get filename and len into qstring */
  	/* get dentry */
  	/* decide whether to create and populate ionde */

  	if ((direntry == NULL) || (file == NULL))

  		return -EINVAL;
  
  	pCifsF = file->private_data;

  	if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))

  		return -ENOENT;

  	rc = cifs_entry_is_dot(pfindEntry, pCifsF);

  	/* skip . and .. since we added them first */

  	if (rc != 0)

  		return 0;

  	sb = file->f_path.dentry->d_sb;
  	cifs_sb = CIFS_SB(sb);

  
  	qstring.name = scratch_buf;

  	rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,

  			pCifsF->srch_inf.info_level,

  			pCifsF->srch_inf.unicode, cifs_sb,

  			max_len, &inum /* returned */);

  	if (rc)

  		return rc;

  	if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)

  		cifs_unix_basic_to_fattr(&fattr,
  				 &((FILE_UNIX_INFO *) pfindEntry)->basic,
  				 cifs_sb);

  	else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
  		cifs_std_info_to_fattr(&fattr, (FIND_FILE_STANDARD_INFO *)
  					pfindEntry, cifs_sb);
  	else
  		cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *)
  					pfindEntry, cifs_sb);

  	if (inum && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {

  		fattr.cf_uniqueid = inum;

  	} else {

  		fattr.cf_uniqueid = iunique(sb, ROOT_I);

  		cifs_autodisable_serverino(cifs_sb);
  	}

  	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
  	tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);

  
  	rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,

  		     ino, fattr.cf_dtype);
  
  	/*
  	 * we can not return filldir errors to the caller since they are
  	 * "normal" when the stat blocksize is too small - we return remapped
  	 * error instead
  	 *
  	 * FIXME: This looks bogus. filldir returns -EOVERFLOW in the above
  	 * case already. Why should we be clobbering other errors from it?
  	 */

  	if (rc) {

  		cFYI(1, "filldir rc = %d", rc);

  		rc = -EOVERFLOW;

  	}

  	dput(tmp_dentry);
  	return rc;
  }

  
  int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
  {
  	int rc = 0;

  	int xid, i;

  	struct cifs_sb_info *cifs_sb;
  	struct cifsTconInfo *pTcon;
  	struct cifsFileInfo *cifsFile = NULL;

  	char *current_entry;

  	int num_to_fill = 0;

  	char *tmp_buf = NULL;

  	char *end_of_smb;

  	unsigned int max_len;

  
  	xid = GetXid();

  	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);

  	pTcon = cifs_sb->tcon;

  	if (pTcon == NULL)

  		return -EINVAL;

  	switch ((int) file->f_pos) {
  	case 0:

  		if (filldir(direntry, ".", 1, file->f_pos,

  		     file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {

  			cERROR(1, "Filldir for current dir failed");

  			rc = -ENOMEM;
  			break;
  		}

  		file->f_pos++;

  	case 1:

  		if (filldir(direntry, "..", 2, file->f_pos,

  		     file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {

  			cERROR(1, "Filldir for parent dir failed");

  			rc = -ENOMEM;
  			break;
  		}

  		file->f_pos++;
  	default:

  		/* 1) If search is active,
  			is in current search buffer?

  			if it before then restart search
  			if after then keep searching till find it */

  		if (file->private_data == NULL) {

  			rc = initiate_cifs_search(xid, file);

  			cFYI(1, "initiate cifs search rc %d", rc);

  			if (rc) {

  				FreeXid(xid);
  				return rc;
  			}
  		}

  		if (file->private_data == NULL) {

  			rc = -EINVAL;
  			FreeXid(xid);
  			return rc;
  		}
  		cifsFile = file->private_data;
  		if (cifsFile->srch_inf.endOfSearch) {

  			if (cifsFile->srch_inf.emptyDir) {

  				cFYI(1, "End of search, empty dir");

  				rc = 0;
  				break;
  			}
  		} /* else {

  			cifsFile->invalidHandle = true;

  			CIFSFindClose(xid, pTcon, cifsFile->netfid);

  		} */

  		rc = find_cifs_entry(xid, pTcon, file,
  				&current_entry, &num_to_fill);

  		if (rc) {

  			cFYI(1, "fce error %d", rc);

  			goto rddir2_exit;
  		} else if (current_entry != NULL) {

  			cFYI(1, "entry %lld found", file->f_pos);

  		} else {

  			cFYI(1, "could not find entry");

  			goto rddir2_exit;
  		}

  		cFYI(1, "loop through %d times filling dir for net buf %p",
  			num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);

  		max_len = smbCalcSize((struct smb_hdr *)
  				cifsFile->srch_inf.ntwrk_buf_start);
  		end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;

  		tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);

  		if (tmp_buf == NULL) {
  			rc = -ENOMEM;
  			break;
  		}

  		for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
  			if (current_entry == NULL) {

  				/* evaluate whether this case is an error */

  				cERROR(1, "past SMB end,  num to fill %d i %d",
  					  num_to_fill, i);

  				break;
  			}

  			/* if buggy server returns . and .. late do
  			we want to check for that here? */

  			rc = cifs_filldir(current_entry, file,
  					filldir, direntry, tmp_buf, max_len);

  			if (rc == -EOVERFLOW) {

  				rc = 0;
  				break;
  			}

  			file->f_pos++;

  			if (file->f_pos ==

  				cifsFile->srch_inf.index_of_last_entry) {

  				cFYI(1, "last entry in buf at pos %lld %s",
  					file->f_pos, tmp_buf);

  				cifs_save_resume_key(current_entry, cifsFile);

  				break;

  			} else
  				current_entry =

  					nxt_dir_entry(current_entry, end_of_smb,
  						cifsFile->srch_inf.info_level);

  		}
  		kfree(tmp_buf);
  		break;
  	} /* end switch */
  
  rddir2_exit:

  	FreeXid(xid);
  	return rc;
  }