/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * dir.h
 *
 * Function prototypes
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 */

#ifndef OCFS2_DIR_H
#define OCFS2_DIR_H

struct ocfs2_dx_hinfo {
        u32     major_hash;
        u32     minor_hash;
};

struct ocfs2_dir_lookup_result {
        struct buffer_head              *dl_leaf_bh;    /* Unindexed leaf
                                                         * block */
        struct ocfs2_dir_entry          *dl_entry;      /* Target dirent in
                                                         * unindexed leaf */

        struct buffer_head              *dl_dx_root_bh; /* Root of indexed
                                                         * tree */

        struct buffer_head              *dl_dx_leaf_bh; /* Indexed leaf block */
        struct ocfs2_dx_entry           *dl_dx_entry;   /* Target dx_entry in
                                                         * indexed leaf */
        struct ocfs2_dx_hinfo           dl_hinfo;       /* Name hash results */

        struct buffer_head              *dl_prev_leaf_bh;/* Previous entry in
                                                          * dir free space
                                                          * list. NULL if
                                                          * previous entry is
                                                          * dx root block. */
};

void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);

int ocfs2_find_entry(const char *name, int namelen,
                     struct inode *dir,
                     struct ocfs2_dir_lookup_result *lookup);
int ocfs2_delete_entry(handle_t *handle,
                       struct inode *dir,
                       struct ocfs2_dir_lookup_result *res);
int __ocfs2_add_entry(handle_t *handle,
                      struct inode *dir,
                      const char *name, int namelen,
                      struct inode *inode, u64 blkno,
                      struct buffer_head *parent_fe_bh,
                      struct ocfs2_dir_lookup_result *lookup);
static inline int ocfs2_add_entry(handle_t *handle,
                                  struct dentry *dentry,
                                  struct inode *inode, u64 blkno,
                                  struct buffer_head *parent_fe_bh,
                                  struct ocfs2_dir_lookup_result *lookup)
{
        return __ocfs2_add_entry(handle, d_inode(dentry->d_parent),
                                 dentry->d_name.name, dentry->d_name.len,
                                 inode, blkno, parent_fe_bh, lookup);
}
int ocfs2_update_entry(struct inode *dir, handle_t *handle,
                       struct ocfs2_dir_lookup_result *res,
                       struct inode *new_entry_inode);

int ocfs2_check_dir_for_entry(struct inode *dir,
                              const char *name,
                              int namelen);
int ocfs2_empty_dir(struct inode *inode);

int ocfs2_find_files_on_disk(const char *name,
                             int namelen,
                             u64 *blkno,
                             struct inode *inode,
                             struct ocfs2_dir_lookup_result *res);
int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
                               int namelen, u64 *blkno);
int ocfs2_readdir(struct file *file, struct dir_context *ctx);
int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx);
int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
                                 struct inode *dir,
                                 struct buffer_head *parent_fe_bh,
                                 const char *name,
                                 int namelen,
                                 struct ocfs2_dir_lookup_result *lookup);
struct ocfs2_alloc_context;
int ocfs2_fill_new_dir(struct ocfs2_super *osb,
                       handle_t *handle,
                       struct inode *parent,
                       struct inode *inode,
                       struct buffer_head *fe_bh,
                       struct ocfs2_alloc_context *data_ac,
                       struct ocfs2_alloc_context *meta_ac);

int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);

struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
                                                            void *data);
#endif /* OCFS2_DIR_H */