linux/fs/nilfs2/ifile.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * NILFS inode file
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * Written by Amagai Yoshiji.
 * Revised by Ryusuke Konishi.
 *
 */

#include <linux/types.h>
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "mdt.h"
#include "alloc.h"
#include "ifile.h"
#include "cpfile.h"

/**
 * struct nilfs_ifile_info - on-memory private data of ifile
 * @mi: on-memory private data of metadata file
 * @palloc_cache: persistent object allocator cache of ifile
 */
struct nilfs_ifile_info { … };

static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
{ … }

/**
 * nilfs_ifile_create_inode - create a new disk inode
 * @ifile: ifile inode
 * @out_ino: pointer to a variable to store inode number
 * @out_bh: buffer_head contains newly allocated disk inode
 *
 * Return Value: On success, 0 is returned and the newly allocated inode
 * number is stored in the place pointed by @ino, and buffer_head pointer
 * that contains newly allocated disk inode structure is stored in the
 * place pointed by @out_bh
 * On error, one of the following negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOSPC - No inode left.
 */
int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
			     struct buffer_head **out_bh)
{ … }

/**
 * nilfs_ifile_delete_inode - delete a disk inode
 * @ifile: ifile inode
 * @ino: inode number
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOENT - The inode number @ino have not been allocated.
 */
int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
{ … }

int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
				struct buffer_head **out_bh)
{ … }

/**
 * nilfs_ifile_count_free_inodes - calculate free inodes count
 * @ifile: ifile inode
 * @nmaxinodes: current maximum of available inodes count [out]
 * @nfreeinodes: free inodes count [out]
 */
int nilfs_ifile_count_free_inodes(struct inode *ifile,
				    u64 *nmaxinodes, u64 *nfreeinodes)
{ … }

/**
 * nilfs_ifile_read - read or get ifile inode
 * @sb: super block instance
 * @root: root object
 * @cno: number of checkpoint entry to read
 * @inode_size: size of an inode
 *
 * Return: 0 on success, or the following negative error code on failure.
 * * %-EINVAL	- Invalid checkpoint.
 * * %-ENOMEM	- Insufficient memory available.
 * * %-EIO	- I/O error (including metadata corruption).
 */
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
		     __u64 cno, size_t inode_size)
{ … }