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Linux/fs/ocfs2/dir.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /* -*- mode: c; c-basic-offset: 8; -*-
  3  * vim: noexpandtab sw=8 ts=8 sts=0:
  4  *
  5  * dir.h
  6  *
  7  * Function prototypes
  8  *
  9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 10  */
 11 
 12 #ifndef OCFS2_DIR_H
 13 #define OCFS2_DIR_H
 14 
 15 struct ocfs2_dx_hinfo {
 16         u32     major_hash;
 17         u32     minor_hash;
 18 };
 19 
 20 struct ocfs2_dir_lookup_result {
 21         struct buffer_head              *dl_leaf_bh;    /* Unindexed leaf
 22                                                          * block */
 23         struct ocfs2_dir_entry          *dl_entry;      /* Target dirent in
 24                                                          * unindexed leaf */
 25 
 26         struct buffer_head              *dl_dx_root_bh; /* Root of indexed
 27                                                          * tree */
 28 
 29         struct buffer_head              *dl_dx_leaf_bh; /* Indexed leaf block */
 30         struct ocfs2_dx_entry           *dl_dx_entry;   /* Target dx_entry in
 31                                                          * indexed leaf */
 32         struct ocfs2_dx_hinfo           dl_hinfo;       /* Name hash results */
 33 
 34         struct buffer_head              *dl_prev_leaf_bh;/* Previous entry in
 35                                                           * dir free space
 36                                                           * list. NULL if
 37                                                           * previous entry is
 38                                                           * dx root block. */
 39 };
 40 
 41 void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
 42 
 43 int ocfs2_find_entry(const char *name, int namelen,
 44                      struct inode *dir,
 45                      struct ocfs2_dir_lookup_result *lookup);
 46 int ocfs2_delete_entry(handle_t *handle,
 47                        struct inode *dir,
 48                        struct ocfs2_dir_lookup_result *res);
 49 int __ocfs2_add_entry(handle_t *handle,
 50                       struct inode *dir,
 51                       const char *name, int namelen,
 52                       struct inode *inode, u64 blkno,
 53                       struct buffer_head *parent_fe_bh,
 54                       struct ocfs2_dir_lookup_result *lookup);
 55 static inline int ocfs2_add_entry(handle_t *handle,
 56                                   struct dentry *dentry,
 57                                   struct inode *inode, u64 blkno,
 58                                   struct buffer_head *parent_fe_bh,
 59                                   struct ocfs2_dir_lookup_result *lookup)
 60 {
 61         return __ocfs2_add_entry(handle, d_inode(dentry->d_parent),
 62                                  dentry->d_name.name, dentry->d_name.len,
 63                                  inode, blkno, parent_fe_bh, lookup);
 64 }
 65 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
 66                        struct ocfs2_dir_lookup_result *res,
 67                        struct inode *new_entry_inode);
 68 
 69 int ocfs2_check_dir_for_entry(struct inode *dir,
 70                               const char *name,
 71                               int namelen);
 72 int ocfs2_empty_dir(struct inode *inode);
 73 
 74 int ocfs2_find_files_on_disk(const char *name,
 75                              int namelen,
 76                              u64 *blkno,
 77                              struct inode *inode,
 78                              struct ocfs2_dir_lookup_result *res);
 79 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
 80                                int namelen, u64 *blkno);
 81 int ocfs2_readdir(struct file *file, struct dir_context *ctx);
 82 int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx);
 83 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 84                                  struct inode *dir,
 85                                  struct buffer_head *parent_fe_bh,
 86                                  const char *name,
 87                                  int namelen,
 88                                  struct ocfs2_dir_lookup_result *lookup);
 89 struct ocfs2_alloc_context;
 90 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 91                        handle_t *handle,
 92                        struct inode *parent,
 93                        struct inode *inode,
 94                        struct buffer_head *fe_bh,
 95                        struct ocfs2_alloc_context *data_ac,
 96                        struct ocfs2_alloc_context *meta_ac);
 97 
 98 int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
 99 
100 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
101                                                             void *data);
102 #endif /* OCFS2_DIR_H */
103 

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