Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0+ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * the_nilfs.h - the_nilfs shared structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Written by Ryusuke Konishi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #ifndef _THE_NILFS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #define _THE_NILFS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/rbtree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/refcount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) struct nilfs_sc_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct nilfs_sysfs_dev_subgroups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /* the_nilfs struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	THE_NILFS_INIT = 0,     /* Information from super_block is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	THE_NILFS_DISCONTINUED,	/* 'next' pointer chain has broken */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	THE_NILFS_GC_RUNNING,	/* gc process is running */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	THE_NILFS_SB_DIRTY,	/* super block is dirty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * struct the_nilfs - struct to supervise multiple nilfs mount points
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * @ns_flags: flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * @ns_flushed_device: flag indicating if all volatile data was flushed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @ns_sb: back pointer to super block instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * @ns_bdev: block device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * @ns_sem: semaphore for shared states
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * @ns_snapshot_mount_mutex: mutex to protect snapshot mounts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * @ns_sbh: buffer heads of on-disk super blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * @ns_sbp: pointers to super block data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * @ns_sbwtime: previous write time of super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * @ns_sbwcount: write count of super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * @ns_sbsize: size of valid data in super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * @ns_mount_state: file system state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * @ns_sb_update_freq: interval of periodical update of superblocks (in seconds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * @ns_seg_seq: segment sequence counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * @ns_segnum: index number of the latest full segment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * @ns_nextnum: index number of the full segment index to be used next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * @ns_pseg_offset: offset of next partial segment in the current full segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * @ns_cno: next checkpoint number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * @ns_ctime: write time of the last segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * @ns_nongc_ctime: write time of the last segment not for cleaner operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * @ns_ndirtyblks: Number of dirty data blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * @ns_last_segment_lock: lock protecting fields for the latest segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * @ns_last_pseg: start block number of the latest segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * @ns_last_seq: sequence value of the latest segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * @ns_last_cno: checkpoint number of the latest segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * @ns_prot_seq: least sequence number of segments which must not be reclaimed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * @ns_prev_seq: base sequence number used to decide if advance log cursor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @ns_writer: log writer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * @ns_segctor_sem: semaphore protecting log write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * @ns_dat: DAT file inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * @ns_cpfile: checkpoint file inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * @ns_sufile: segusage file inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  * @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  * @ns_cptree_lock: lock protecting @ns_cptree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  * @ns_dirty_files: list of dirty files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  * @ns_inode_lock: lock protecting @ns_dirty_files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * @ns_gc_inodes: dummy inodes to keep live blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  * @ns_next_generation: next generation number for inodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * @ns_next_gen_lock: lock protecting @ns_next_generation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * @ns_mount_opt: mount options
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * @ns_resuid: uid for reserved blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * @ns_resgid: gid for reserved blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * @ns_interval: checkpoint creation interval
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * @ns_watermark: watermark for the number of dirty buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * @ns_blocksize_bits: bit length of block size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * @ns_blocksize: block size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * @ns_nsegments: number of segments in filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * @ns_blocks_per_segment: number of blocks per segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * @ns_r_segments_percentage: reserved segments percentage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * @ns_nrsvsegs: number of reserved segments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * @ns_first_data_block: block number of first data block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * @ns_inode_size: size of on-disk inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * @ns_first_ino: first not-special inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * @ns_crc_seed: seed value of CRC32 calculation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * @ns_dev_kobj: /sys/fs/<nilfs>/<device>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * @ns_dev_kobj_unregister: completion state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * @ns_dev_subgroups: <device> subgroups pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) struct the_nilfs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	unsigned long		ns_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	int			ns_flushed_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct super_block     *ns_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct block_device    *ns_bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct rw_semaphore	ns_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct mutex		ns_snapshot_mount_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 * used for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * - loading the latest checkpoint exclusively.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 * - allocating a new full segment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	struct buffer_head     *ns_sbh[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	struct nilfs_super_block *ns_sbp[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	time64_t		ns_sbwtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	unsigned int		ns_sbwcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	unsigned int		ns_sbsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	unsigned int		ns_mount_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	unsigned int		ns_sb_update_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	 * The following fields are updated by a writable FS-instance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	 * These fields are protected by ns_segctor_sem outside load_nilfs().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	u64			ns_seg_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	__u64			ns_segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	__u64			ns_nextnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	unsigned long		ns_pseg_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	__u64			ns_cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	time64_t		ns_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	time64_t		ns_nongc_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	atomic_t		ns_ndirtyblks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	 * The following fields hold information on the latest partial segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	 * written to disk with a super root.  These fields are protected by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	 * ns_last_segment_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	spinlock_t		ns_last_segment_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	sector_t		ns_last_pseg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	u64			ns_last_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	__u64			ns_last_cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	u64			ns_prot_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	u64			ns_prev_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct nilfs_sc_info   *ns_writer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct rw_semaphore	ns_segctor_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	 * Following fields are lock free except for the period before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	 * the_nilfs is initialized.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	struct inode	       *ns_dat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	struct inode	       *ns_cpfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct inode	       *ns_sufile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	/* Checkpoint tree */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	struct rb_root		ns_cptree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	spinlock_t		ns_cptree_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	/* Dirty inode list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct list_head	ns_dirty_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	spinlock_t		ns_inode_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	/* GC inode list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	struct list_head	ns_gc_inodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	/* Inode allocator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	u32			ns_next_generation;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	spinlock_t		ns_next_gen_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/* Mount options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	unsigned long		ns_mount_opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	uid_t			ns_resuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	gid_t			ns_resgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	unsigned long		ns_interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	unsigned long		ns_watermark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	/* Disk layout information (static) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	unsigned int		ns_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	unsigned int		ns_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	unsigned long		ns_nsegments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	unsigned long		ns_blocks_per_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	unsigned long		ns_r_segments_percentage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	unsigned long		ns_nrsvsegs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	unsigned long		ns_first_data_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	int			ns_inode_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	int			ns_first_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	u32			ns_crc_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/* /sys/fs/<nilfs>/<device> */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	struct kobject ns_dev_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct completion ns_dev_kobj_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	struct nilfs_sysfs_dev_subgroups *ns_dev_subgroups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #define THE_NILFS_FNS(bit, name)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static inline void set_nilfs_##name(struct the_nilfs *nilfs)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static inline void clear_nilfs_##name(struct the_nilfs *nilfs)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static inline int nilfs_##name(struct the_nilfs *nilfs)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) THE_NILFS_FNS(INIT, init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) THE_NILFS_FNS(DISCONTINUED, discontinued)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) THE_NILFS_FNS(GC_RUNNING, gc_running)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) THE_NILFS_FNS(SB_DIRTY, sb_dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  * Mount option operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) #define nilfs_clear_opt(nilfs, opt)  \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	((nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #define nilfs_set_opt(nilfs, opt)  \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	((nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) #define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #define nilfs_write_opt(nilfs, mask, opt)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	((nilfs)->ns_mount_opt =					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		(((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) |	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		 NILFS_MOUNT_##opt))					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * struct nilfs_root - nilfs root object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * @cno: checkpoint number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * @rb_node: red-black tree node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * @count: refcount of this structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * @nilfs: nilfs object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * @ifile: inode file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * @inodes_count: number of inodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * @blocks_count: number of blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * @snapshot_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * @snapshot_kobj_unregister: completion state for kernel object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct nilfs_root {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	__u64 cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	struct rb_node rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	refcount_t count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	struct the_nilfs *nilfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct inode *ifile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	atomic64_t inodes_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	atomic64_t blocks_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot> */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	struct kobject snapshot_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	struct completion snapshot_kobj_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* Special checkpoint number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) #define NILFS_CPTREE_CURRENT_CNO	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /* Minimum interval of periodical update of superblocks (in seconds) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) #define NILFS_SB_FREQ		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	u64 t = ktime_get_real_seconds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return t < nilfs->ns_sbwtime ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	int flip_bits = nilfs->ns_sbwcount & 0x0FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	return (flip_bits != 0x08 && flip_bits != 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct the_nilfs *alloc_nilfs(struct super_block *sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) void destroy_nilfs(struct the_nilfs *nilfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 					     __u64 cno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) void nilfs_put_root(struct nilfs_root *root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int nilfs_near_disk_full(struct the_nilfs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) void nilfs_fall_back_super_block(struct the_nilfs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) void nilfs_swap_super_block(struct the_nilfs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static inline void nilfs_get_root(struct nilfs_root *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	refcount_inc(&root->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	unsigned int valid_fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	down_read(&nilfs->ns_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	up_read(&nilfs->ns_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	return valid_fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			sector_t *seg_start, sector_t *seg_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	*seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	*seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (segnum == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		*seg_start = nilfs->ns_first_data_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static inline sector_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	return (segnum == 0) ? nilfs->ns_first_data_block :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		(sector_t)nilfs->ns_blocks_per_segment * segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static inline __u64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	sector_t segnum = blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	sector_div(segnum, nilfs->ns_blocks_per_segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	return segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			sector_t seg_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	/* terminate the current full segment (used in case of I/O-error) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	nilfs->ns_pseg_offset = seg_end - seg_start + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	/* move forward with a full segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	nilfs->ns_segnum = nilfs->ns_nextnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	nilfs->ns_pseg_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	nilfs->ns_seg_seq++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	__u64 cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	spin_lock(&nilfs->ns_last_segment_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	cno = nilfs->ns_last_cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	spin_unlock(&nilfs->ns_last_segment_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	return cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static inline int nilfs_flush_device(struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (!nilfs_test_opt(nilfs, BARRIER) || nilfs->ns_flushed_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	nilfs->ns_flushed_device = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	 * the store to ns_flushed_device must not be reordered after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	 * blkdev_issue_flush().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	err = blkdev_issue_flush(nilfs->ns_bdev, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	if (err != -EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) #endif /* _THE_NILFS_H */