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readdir.c

/*
 *   fs/cifs/readdir.c
 *
 *   Directory search handling
 *
 *   Copyright (C) International Business Machines  Corp., 2004, 2007
 *   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/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"

#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"));
            }
      }
}
#endif /* DEBUG2 */

/* Returns one if new inode created (which therefore needs to be hashed) */
/* Might check in the future if inode number changed so we can rehash inode */
static int construct_dentry(struct qstr *qstring, struct file *file,
      struct inode **ptmp_inode, struct dentry **pnew_dentry)
{
      struct dentry *tmp_dentry;
      struct cifs_sb_info *cifs_sb;
      struct cifsTconInfo *pTcon;
      int rc = 0;

      cFYI(1, ("For %s", qstring->name));
      cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
      pTcon = cifs_sb->tcon;

      qstring->hash = full_name_hash(qstring->name, qstring->len);
      tmp_dentry = d_lookup(file->f_path.dentry, qstring);
      if (tmp_dentry) {
            cFYI(0, ("existing dentry with inode 0x%p",
                   tmp_dentry->d_inode));
            *ptmp_inode = tmp_dentry->d_inode;
/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
            if (*ptmp_inode == NULL) {
                  *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
                  if (*ptmp_inode == NULL)
                        return rc;
                  rc = 1;
            }
            if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
                  (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
      } else {
            tmp_dentry = d_alloc(file->f_path.dentry, qstring);
            if (tmp_dentry == NULL) {
                  cERROR(1, ("Failed allocating dentry"));
                  *ptmp_inode = NULL;
                  return rc;
            }

            *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
            if (pTcon->nocase)
                  tmp_dentry->d_op = &cifs_ci_dentry_ops;
            else
                  tmp_dentry->d_op = &cifs_dentry_ops;
            if (*ptmp_inode == NULL)
                  return rc;
            if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
                  (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
            rc = 2;
      }

      tmp_dentry->d_time = jiffies;
      *pnew_dentry = tmp_dentry;
      return rc;
}

static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
{
      if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
            inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
            inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
            inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
      }
      return;
}


static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
                    char *buf, unsigned int *pobject_type, int isNewInode)
{
      loff_t local_size;
      struct timespec local_mtime;

      struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
      struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
      __u32 attr;
      __u64 allocation_size;
      __u64 end_of_file;

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

      if (new_buf_type) {
            FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;

            attr = le32_to_cpu(pfindData->ExtFileAttributes);
            allocation_size = le64_to_cpu(pfindData->AllocationSize);
            end_of_file = le64_to_cpu(pfindData->EndOfFile);
            tmp_inode->i_atime =
                  cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
            tmp_inode->i_mtime =
                  cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
            tmp_inode->i_ctime =
                  cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
      } else { /* legacy, OS2 and DOS style */
/*          struct timespec ts;*/
            FIND_FILE_STANDARD_INFO * pfindData =
                  (FIND_FILE_STANDARD_INFO *)buf;

            tmp_inode->i_mtime = cnvrtDosUnixTm(
                        le16_to_cpu(pfindData->LastWriteDate),
                        le16_to_cpu(pfindData->LastWriteTime));
            tmp_inode->i_atime = cnvrtDosUnixTm(
                        le16_to_cpu(pfindData->LastAccessDate),
                        le16_to_cpu(pfindData->LastAccessTime));
            tmp_inode->i_ctime = cnvrtDosUnixTm(
                        le16_to_cpu(pfindData->LastWriteDate),
                        le16_to_cpu(pfindData->LastWriteTime));
            AdjustForTZ(cifs_sb->tcon, tmp_inode);
            attr = le16_to_cpu(pfindData->Attributes);
            allocation_size = le32_to_cpu(pfindData->AllocationSize);
            end_of_file = le32_to_cpu(pfindData->DataSize);
      }

      /* Linux can not store file creation time unfortunately so ignore it */

      cifsInfo->cifsAttrs = attr;
#ifdef CONFIG_CIFS_EXPERIMENTAL
      if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
            /* get more accurate mode via ACL - so force inode refresh */
            cifsInfo->time = 0;
      } else
#endif /* CONFIG_CIFS_EXPERIMENTAL */
            cifsInfo->time = jiffies;

      /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
      /* 2767 perms - indicate mandatory locking */
            /* BB fill in uid and gid here? with help from winbind?
               or retrieve from NTFS stream extended attribute */
      if (atomic_read(&cifsInfo->inUse) == 0) {
            tmp_inode->i_uid = cifs_sb->mnt_uid;
            tmp_inode->i_gid = cifs_sb->mnt_gid;
            /* set default mode. will override for dirs below */
            tmp_inode->i_mode = cifs_sb->mnt_file_mode;
      } else {
            /* mask off the type bits since it gets set
            below and we do not want to get two type
            bits set */
            tmp_inode->i_mode &= ~S_IFMT;
      }

      if (attr & ATTR_DIRECTORY) {
            *pobject_type = DT_DIR;
            /* override default perms since we do not lock dirs */
            if (atomic_read(&cifsInfo->inUse) == 0) {
                  tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
            }
            tmp_inode->i_mode |= S_IFDIR;
      } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
               (attr & ATTR_SYSTEM)) {
            if (end_of_file == 0)  {
                  *pobject_type = DT_FIFO;
                  tmp_inode->i_mode |= S_IFIFO;
            } else {
                  /* rather than get the type here, we mark the
                  inode as needing revalidate and get the real type
                  (blk vs chr vs. symlink) later ie in lookup */
                  *pobject_type = DT_REG;
                  tmp_inode->i_mode |= S_IFREG;
                  cifsInfo->time = 0;
            }
/* we no longer mark these because we could not follow them */
/*        } else if (attr & ATTR_REPARSE) {
            *pobject_type = DT_LNK;
            tmp_inode->i_mode |= S_IFLNK; */
      } else {
            *pobject_type = DT_REG;
            tmp_inode->i_mode |= S_IFREG;
            if (attr & ATTR_READONLY)
                  tmp_inode->i_mode &= ~(S_IWUGO);
            else if ((tmp_inode->i_mode & S_IWUGO) == 0)
                  /* the ATTR_READONLY flag may have been changed on   */
                  /* server -- set any w bits allowed by mnt_file_mode */
                  tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
      } /* could add code here - to validate if device or weird share type? */

      /* can not fill in nlink here as in qpathinfo version and Unx search */
      if (atomic_read(&cifsInfo->inUse) == 0) {
            atomic_set(&cifsInfo->inUse, 1);
      }

      spin_lock(&tmp_inode->i_lock);
      if (is_size_safe_to_change(cifsInfo, end_of_file)) {
            /* can not safely change the file size here if the
            client is writing to it due to potential races */
            i_size_write(tmp_inode, end_of_file);

      /* 512 bytes (2**9) is the fake blocksize that must be used */
      /* for this calculation, even though the reported blocksize is larger */
            tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
      }
      spin_unlock(&tmp_inode->i_lock);

      if (allocation_size < end_of_file)
            cFYI(1, ("May be sparse file, allocation less than file size"));
      cFYI(1, ("File Size %ld and blocks %llu",
            (unsigned long)tmp_inode->i_size,
            (unsigned long long)tmp_inode->i_blocks));
      if (S_ISREG(tmp_inode->i_mode)) {
            cFYI(1, ("File inode"));
            tmp_inode->i_op = &cifs_file_inode_ops;
            if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
                  if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                        tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
                  else
                        tmp_inode->i_fop = &cifs_file_direct_ops;
            } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                  tmp_inode->i_fop = &cifs_file_nobrl_ops;
            else
                  tmp_inode->i_fop = &cifs_file_ops;

            if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
               (cifs_sb->tcon->ses->server->maxBuf <
                  PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
                  tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
            else
                  tmp_inode->i_data.a_ops = &cifs_addr_ops;

            if (isNewInode)
                  return; /* No sense invalidating pages for new inode
                           since have not started caching readahead file
                           data yet */

            if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
                  (local_size == tmp_inode->i_size)) {
                  cFYI(1, ("inode exists but unchanged"));
            } else {
                  /* file may have changed on server */
                  cFYI(1, ("invalidate inode, readdir detected change"));
                  invalidate_remote_inode(tmp_inode);
            }
      } else if (S_ISDIR(tmp_inode->i_mode)) {
            cFYI(1, ("Directory inode"));
            tmp_inode->i_op = &cifs_dir_inode_ops;
            tmp_inode->i_fop = &cifs_dir_ops;
      } else if (S_ISLNK(tmp_inode->i_mode)) {
            cFYI(1, ("Symbolic Link inode"));
            tmp_inode->i_op = &cifs_symlink_inode_ops;
      } else {
            cFYI(1, ("Init special inode"));
            init_special_inode(tmp_inode, tmp_inode->i_mode,
                           tmp_inode->i_rdev);
      }
}

static void unix_fill_in_inode(struct inode *tmp_inode,
      FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
{
      loff_t local_size;
      struct timespec local_mtime;

      struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
      struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);

      __u32 type = le32_to_cpu(pfindData->Type);
      __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
      __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
      cifsInfo->time = jiffies;
      atomic_inc(&cifsInfo->inUse);

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

      tmp_inode->i_atime =
          cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
      tmp_inode->i_mtime =
          cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
      tmp_inode->i_ctime =
          cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));

      tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
      /* since we set the inode type below we need to mask off type
         to avoid strange results if bits above were corrupt */
      tmp_inode->i_mode &= ~S_IFMT;
      if (type == UNIX_FILE) {
            *pobject_type = DT_REG;
            tmp_inode->i_mode |= S_IFREG;
      } else if (type == UNIX_SYMLINK) {
            *pobject_type = DT_LNK;
            tmp_inode->i_mode |= S_IFLNK;
      } else if (type == UNIX_DIR) {
            *pobject_type = DT_DIR;
            tmp_inode->i_mode |= S_IFDIR;
      } else if (type == UNIX_CHARDEV) {
            *pobject_type = DT_CHR;
            tmp_inode->i_mode |= S_IFCHR;
            tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
                        le64_to_cpu(pfindData->DevMinor) & MINORMASK);
      } else if (type == UNIX_BLOCKDEV) {
            *pobject_type = DT_BLK;
            tmp_inode->i_mode |= S_IFBLK;
            tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
                        le64_to_cpu(pfindData->DevMinor) & MINORMASK);
      } else if (type == UNIX_FIFO) {
            *pobject_type = DT_FIFO;
            tmp_inode->i_mode |= S_IFIFO;
      } else if (type == UNIX_SOCKET) {
            *pobject_type = DT_SOCK;
            tmp_inode->i_mode |= S_IFSOCK;
      } else {
            /* safest to just call it a file */
            *pobject_type = DT_REG;
            tmp_inode->i_mode |= S_IFREG;
            cFYI(1, ("unknown inode type %d", type));
      }

      if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
            tmp_inode->i_uid = cifs_sb->mnt_uid;
      else
            tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
      if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
            tmp_inode->i_gid = cifs_sb->mnt_gid;
      else
            tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
      tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);

      spin_lock(&tmp_inode->i_lock);
      if (is_size_safe_to_change(cifsInfo, end_of_file)) {
            /* can not safely change the file size here if the
            client is writing to it due to potential races */
            i_size_write(tmp_inode, end_of_file);

      /* 512 bytes (2**9) is the fake blocksize that must be used */
      /* for this calculation, not the real blocksize */
            tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
      }
      spin_unlock(&tmp_inode->i_lock);

      if (S_ISREG(tmp_inode->i_mode)) {
            cFYI(1, ("File inode"));
            tmp_inode->i_op = &cifs_file_inode_ops;

            if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
                  if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                        tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
                  else
                        tmp_inode->i_fop = &cifs_file_direct_ops;
            } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                  tmp_inode->i_fop = &cifs_file_nobrl_ops;
            else
                  tmp_inode->i_fop = &cifs_file_ops;

            if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
               (cifs_sb->tcon->ses->server->maxBuf <
                  PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
                  tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
            else
                  tmp_inode->i_data.a_ops = &cifs_addr_ops;

            if (isNewInode)
                  return; /* No sense invalidating pages for new inode
                           since we have not started caching readahead
                           file data for it yet */

            if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
                  (local_size == tmp_inode->i_size)) {
                  cFYI(1, ("inode exists but unchanged"));
            } else {
                  /* file may have changed on server */
                  cFYI(1, ("invalidate inode, readdir detected change"));
                  invalidate_remote_inode(tmp_inode);
            }
      } else if (S_ISDIR(tmp_inode->i_mode)) {
            cFYI(1, ("Directory inode"));
            tmp_inode->i_op = &cifs_dir_inode_ops;
            tmp_inode->i_fop = &cifs_dir_ops;
      } else if (S_ISLNK(tmp_inode->i_mode)) {
            cFYI(1, ("Symbolic Link inode"));
            tmp_inode->i_op = &cifs_symlink_inode_ops;
/* tmp_inode->i_fop = *//* do not need to set to anything */
      } else {
            cFYI(1, ("Special inode"));
            init_special_inode(tmp_inode, tmp_inode->i_mode,
                           tmp_inode->i_rdev);
      }
}

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;
      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;

}

/* 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 */

#ifdef CONFIG_CIFS_DEBUG2
      dump_cifs_file_struct(file, "In fce ");
#endif
      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"));
            cifsFile->invalidHandle = TRUE;
            CIFSFindClose(xid, pTcon, cifsFile->netfid);
            kfree(cifsFile->search_resume_name);
            cifsFile->search_resume_name = NULL;
            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);
            }
            rc = initiate_cifs_search(xid, file);
            if (rc) {
                  cFYI(1, ("error %d reinitiating a search on rewind",
                         rc));
                  return rc;
            }
      }

      while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
            (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
            cFYI(1, ("calling findnext2"));
            rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
                          &cifsFile->srch_inf);
            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, int max_len, ino_t *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);
            }

            /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
            if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
                  *pinum = pFindData->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 = 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) {
            /* BB fixme - test with long names */
            /* Note converted filename can be longer than in unicode */
            if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
                  pqst->len = cifs_convertUCSpath((char *)pqst->name,
                              (__le16 *)filename, len/2, nlt);
            else
                  pqst->len = cifs_strfromUCS_le((char *)pqst->name,
                              (__le16 *)filename, len/2, nlt);
      } else {
            pqst->name = filename;
            pqst->len = len;
      }
      pqst->hash = full_name_hash(pqst->name, pqst->len);
/*    cFYI(1, ("filldir on %s",pqst->name));  */
      return rc;
}

static int cifs_filldir(char *pfindEntry, struct file *file,
      filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
{
      int rc = 0;
      struct qstr qstring;
      struct cifsFileInfo *pCifsF;
      unsigned int obj_type;
      ino_t  inum;
      struct cifs_sb_info *cifs_sb;
      struct inode *tmp_inode;
      struct dentry *tmp_dentry;

      /* 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;

      cifs_sb = CIFS_SB(file->f_path.dentry->d_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;

      rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
      if ((tmp_inode == NULL) || (tmp_dentry == NULL))
            return -ENOMEM;

      if (rc) {
            /* inode created, we need to hash it with right inode number */
            if (inum != 0) {
                  /* BB fixme - hash the 2 32 quantities bits together if
                   *  necessary BB */
                  tmp_inode->i_ino = inum;
            }
            insert_inode_hash(tmp_inode);
      }

      /* we pass in rc below, indicating whether it is a new inode,
         so we can figure out whether to invalidate the inode cached
         data if the file has changed */
      if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
            unix_fill_in_inode(tmp_inode,
                           (FILE_UNIX_INFO *)pfindEntry,
                           &obj_type, rc);
      else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
            fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
                        pfindEntry, &obj_type, rc);
      else
            fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);

      if (rc) /* new inode - needs to be tied to dentry */ {
            d_instantiate(tmp_dentry, tmp_inode);
            if (rc == 2)
                  d_rehash(tmp_dentry);
      }


      rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
                 tmp_inode->i_ino, obj_type);
      if (rc) {
            cFYI(1, ("filldir rc = %d", rc));
            /* 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 */
            rc = -EOVERFLOW;
      }

      dput(tmp_dentry);
      return rc;
}

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;
}

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;
      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);
            }
            kfree(cifsFile->search_resume_name);
            cifsFile->search_resume_name = NULL; */

            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;

            /* 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. cifs_unicode.c,
            which actually does the conversion, has the same limit */
            tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
            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;
}

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