shithub: riscv

ref: 5622b0bbd878dbc34045cc6fd37cffa64461eabe
dir: /sys/src/cmd/ext4srv/include/ext4_dir_idx.h/

#pragma once

#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_fs.h"
#include "ext4_dir.h"

struct ext4_dir_idx_block {
	struct ext4_block b;
	struct ext4_dir_idx_entry *entries;
	struct ext4_dir_idx_entry *position;
};

#define EXT4_DIR_DX_INIT_BCNT 2


/**@brief Initialize index structure of new directory.
 * @param dir Pointer to directory i-node
 * @param dir Pointer to parent directory i-node
 * @return Error code
 */
int ext4_dir_dx_init(struct ext4_inode_ref *dir,
		     struct ext4_inode_ref *parent);

/**@brief Try to find directory entry using directory index.
 * @param result    Output value - if entry will be found,
 *                  than will be passed through this parameter
 * @param inode_ref Directory i-node
 * @param name_len  Length of name to be found
 * @param name      Name to be found
 * @return Error code
 */
int ext4_dir_dx_find_entry(struct ext4_dir_search_result *result,
			   struct ext4_inode_ref *inode_ref, usize name_len,
			   const char *name);

/**@brief Add new entry to indexed directory
 * @param parent Directory i-node
 * @param child  I-node to be referenced from directory entry
 * @param name   Name of new directory entry
 * @return Error code
 */
int ext4_dir_dx_add_entry(struct ext4_inode_ref *parent,
			  struct ext4_inode_ref *child, const char *name, u32int name_len);

/**@brief Add new entry to indexed directory
 * @param dir           Directory i-node
 * @param parent_inode  parent inode index
 * @return Error code
 */
int ext4_dir_dx_reset_parent_inode(struct ext4_inode_ref *dir,
                                   u32int parent_inode);