linux-imx

/* SPDX-License-Identifier: GPL-2.0+ */

/*

 * the_nilfs.h - the_nilfs shared structure.

 *

 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.

 *

 * Written by Ryusuke Konishi.

 *

 */

​

#ifndef _THE_NILFS_H

#define _THE_NILFS_H

​

#include <linux/types.h>

#include <linux/buffer_head.h>

#include <linux/rbtree.h>

#include <linux/fs.h>

#include <linux/blkdev.h>

#include <linux/backing-dev.h>

#include <linux/slab.h>

#include <linux/refcount.h>

​

struct nilfs_sc_info;

struct nilfs_sysfs_dev_subgroups;

​

/* the_nilfs struct */

enum {

    THE_NILFS_INIT = 0,     /* Information from super_block is set */

    THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */

    THE_NILFS_GC_RUNNING,   /* gc process is running */

    THE_NILFS_SB_DIRTY, /* super block is dirty */

};

​

/**

 * struct the_nilfs - struct to supervise multiple nilfs mount points

 * @ns_flags: flags

 * @ns_flushed_device: flag indicating if all volatile data was flushed

 * @ns_sb: back pointer to super block instance

 * @ns_bdev: block device

 * @ns_sem: semaphore for shared states

 * @ns_snapshot_mount_mutex: mutex to protect snapshot mounts

 * @ns_sbh: buffer heads of on-disk super blocks

 * @ns_sbp: pointers to super block data

 * @ns_sbwtime: previous write time of super block

 * @ns_sbwcount: write count of super block

 * @ns_sbsize: size of valid data in super block

 * @ns_mount_state: file system state

 * @ns_sb_update_freq: interval of periodical update of superblocks (in seconds)

 * @ns_seg_seq: segment sequence counter

 * @ns_segnum: index number of the latest full segment.

 * @ns_nextnum: index number of the full segment index to be used next

 * @ns_pseg_offset: offset of next partial segment in the current full segment

 * @ns_cno: next checkpoint number

 * @ns_ctime: write time of the last segment

 * @ns_nongc_ctime: write time of the last segment not for cleaner operation

 * @ns_ndirtyblks: Number of dirty data blocks

 * @ns_last_segment_lock: lock protecting fields for the latest segment

 * @ns_last_pseg: start block number of the latest segment

 * @ns_last_seq: sequence value of the latest segment

 * @ns_last_cno: checkpoint number of the latest segment

 * @ns_prot_seq: least sequence number of segments which must not be reclaimed

 * @ns_prev_seq: base sequence number used to decide if advance log cursor

 * @ns_writer: log writer

 * @ns_segctor_sem: semaphore protecting log write

 * @ns_dat: DAT file inode

 * @ns_cpfile: checkpoint file inode

 * @ns_sufile: segusage file inode

 * @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)

 * @ns_cptree_lock: lock protecting @ns_cptree

 * @ns_dirty_files: list of dirty files

 * @ns_inode_lock: lock protecting @ns_dirty_files

 * @ns_gc_inodes: dummy inodes to keep live blocks

 * @ns_next_generation: next generation number for inodes

 * @ns_next_gen_lock: lock protecting @ns_next_generation

 * @ns_mount_opt: mount options

 * @ns_resuid: uid for reserved blocks

 * @ns_resgid: gid for reserved blocks

 * @ns_interval: checkpoint creation interval

 * @ns_watermark: watermark for the number of dirty buffers

 * @ns_blocksize_bits: bit length of block size

 * @ns_blocksize: block size

 * @ns_nsegments: number of segments in filesystem

 * @ns_blocks_per_segment: number of blocks per segment

 * @ns_r_segments_percentage: reserved segments percentage

 * @ns_nrsvsegs: number of reserved segments

 * @ns_first_data_block: block number of first data block

 * @ns_inode_size: size of on-disk inode

 * @ns_first_ino: first not-special inode number

 * @ns_crc_seed: seed value of CRC32 calculation

 * @ns_dev_kobj: /sys/fs/<nilfs>/<device>

 * @ns_dev_kobj_unregister: completion state

 * @ns_dev_subgroups: <device> subgroups pointer