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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * dir.h
   5  *
   6  * Function prototypes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #ifndef OCFS2_DIR_H
  27 #define OCFS2_DIR_H
  28
  29 struct ocfs2_dx_hinfo {
  30         u32     major_hash;
  31         u32     minor_hash;
  32 };
  33
  34 struct ocfs2_dir_lookup_result {
  35         struct buffer_head              *dl_leaf_bh;    /* Unindexed leaf
  36                                                          * block */
  37         struct ocfs2_dir_entry          *dl_entry;      /* Target dirent in
  38                                                          * unindexed leaf */
  39
  40         struct buffer_head              *dl_dx_root_bh; /* Root of indexed
  41                                                          * tree */
  42
  43         struct buffer_head              *dl_dx_leaf_bh; /* Indexed leaf block */
  44         struct ocfs2_dx_entry           *dl_dx_entry;   /* Target dx_entry in
  45                                                          * indexed leaf */
  46         struct ocfs2_dx_hinfo           dl_hinfo;       /* Name hash results */
  47
  48         struct buffer_head              *dl_prev_leaf_bh;/* Previous entry in
  49                                                           * dir free space
  50                                                           * list. NULL if
  51                                                           * previous entry is
  52                                                           * dx root block. */
  53 };
  54
  55 void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
  56
  57 int ocfs2_find_entry(const char *name, int namelen,
  58                      struct inode *dir,
  59                      struct ocfs2_dir_lookup_result *lookup);
  60 int ocfs2_delete_entry(handle_t *handle,
  61                        struct inode *dir,
  62                        struct ocfs2_dir_lookup_result *res);
  63 int __ocfs2_add_entry(handle_t *handle,
  64                       struct inode *dir,
  65                       const char *name, int namelen,
  66                       struct inode *inode, u64 blkno,
  67                       struct buffer_head *parent_fe_bh,
  68                       struct ocfs2_dir_lookup_result *lookup);
  69 static inline int ocfs2_add_entry(handle_t *handle,
  70                                   struct dentry *dentry,
  71                                   struct inode *inode, u64 blkno,
  72                                   struct buffer_head *parent_fe_bh,
  73                                   struct ocfs2_dir_lookup_result *lookup)
  74 {
  75         return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
  76                                  dentry->d_name.name, dentry->d_name.len,
  77                                  inode, blkno, parent_fe_bh, lookup);
  78 }
  79 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
  80                        struct ocfs2_dir_lookup_result *res,
  81                        struct inode *new_entry_inode);
  82
  83 int ocfs2_check_dir_for_entry(struct inode *dir,
  84                               const char *name,
  85                               int namelen);
  86 int ocfs2_empty_dir(struct inode *inode);
  87
  88 int ocfs2_find_files_on_disk(const char *name,
  89                              int namelen,
  90                              u64 *blkno,
  91                              struct inode *inode,
  92                              struct ocfs2_dir_lookup_result *res);
  93 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
  94                                int namelen, u64 *blkno);
  95 int ocfs2_readdir(struct file *filp, void *dirent, filldir_t filldir);
  96 int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
  97                       filldir_t filldir);
  98 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
  99                                  struct inode *dir,
 100                                  struct buffer_head *parent_fe_bh,
 101                                  const char *name,
 102                                  int namelen,
 103                                  struct ocfs2_dir_lookup_result *lookup);
 104 struct ocfs2_alloc_context;
 105 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 106                        handle_t *handle,
 107                        struct inode *parent,
 108                        struct inode *inode,
 109                        struct buffer_head *fe_bh,
 110                        struct ocfs2_alloc_context *data_ac,
 111                        struct ocfs2_alloc_context *meta_ac);
 112
 113 int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
 114
 115 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
 116                                                             void *data);
 117 #endif /* OCFS2_DIR_H */