ubifs.h 78 KB
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/*
 * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * (C) Copyright 2008-2009
 * Stefan Roese, DENX Software Engineering, sr@denx.de.
 *
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 * SPDX-License-Identifier:	GPL-2.0+
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 *
 * Authors: Artem Bityutskiy (Битюцкий Артём)
 *          Adrian Hunter
 */

#ifndef __UBIFS_H__
#define __UBIFS_H__

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#ifndef __UBOOT__
#include <asm/div64.h>
#include <linux/statfs.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/mtd/ubi.h>
#include <linux/pagemap.h>
#include <linux/backing-dev.h>
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#include <linux/security.h>
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#include "ubifs-media.h"
#else
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#include <asm/atomic.h>
#include <asm-generic/atomic-long.h>
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#include <ubi_uboot.h>
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#include <ubifs_uboot.h>
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#include <linux/ctype.h>
#include <linux/time.h>
#include <linux/math64.h>
#include "ubifs-media.h"

struct dentry;
struct file;
struct iattr;
struct kstat;
struct vfsmount;

extern struct super_block *ubifs_sb;

extern unsigned int ubifs_msg_flags;
extern unsigned int ubifs_chk_flags;
extern unsigned int ubifs_tst_flags;

#define pgoff_t		unsigned long

/*
 * We "simulate" the Linux page struct much simpler here
 */
struct page {
	pgoff_t index;
	void *addr;
	struct inode *inode;
};

void iput(struct inode *inode);

/* linux/include/time.h */
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#define NSEC_PER_SEC	1000000000L
#define get_seconds()	0
#define CURRENT_TIME_SEC	((struct timespec) { get_seconds(), 0 })
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struct timespec {
	time_t	tv_sec;		/* seconds */
	long	tv_nsec;	/* nanoseconds */
};

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static struct timespec current_fs_time(struct super_block *sb)
{
	struct timespec now;
	now.tv_sec = 0;
	now.tv_nsec = 0;
	return now;
};

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/* linux/include/dcache.h */

/*
 * "quick string" -- eases parameter passing, but more importantly
 * saves "metadata" about the string (ie length and the hash).
 *
 * hash comes first so it snuggles against d_parent in the
 * dentry.
 */
struct qstr {
	unsigned int hash;
	unsigned int len;
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#ifndef __UBOOT__
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	const char *name;
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#else
	char *name;
#endif
};

/* include/linux/fs.h */

/* Possible states of 'frozen' field */
enum {
	SB_UNFROZEN = 0,		/* FS is unfrozen */
	SB_FREEZE_WRITE	= 1,		/* Writes, dir ops, ioctls frozen */
	SB_FREEZE_PAGEFAULT = 2,	/* Page faults stopped as well */
	SB_FREEZE_FS = 3,		/* For internal FS use (e.g. to stop
					 * internal threads if needed) */
	SB_FREEZE_COMPLETE = 4,		/* ->freeze_fs finished successfully */
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};

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#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)

struct sb_writers {
#ifndef __UBOOT__
	/* Counters for counting writers at each level */
	struct percpu_counter	counter[SB_FREEZE_LEVELS];
#endif
	wait_queue_head_t	wait;		/* queue for waiting for
						   writers / faults to finish */
	int			frozen;		/* Is sb frozen? */
	wait_queue_head_t	wait_unfrozen;	/* queue for waiting for
						   sb to be thawed */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map	lock_map[SB_FREEZE_LEVELS];
#endif
};

struct address_space {
	struct inode		*host;		/* owner: inode, block_device */
#ifndef __UBOOT__
	struct radix_tree_root	page_tree;	/* radix tree of all pages */
#endif
	spinlock_t		tree_lock;	/* and lock protecting it */
	unsigned int		i_mmap_writable;/* count VM_SHARED mappings */
	struct rb_root		i_mmap;		/* tree of private and shared mappings */
	struct list_head	i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
	struct mutex		i_mmap_mutex;	/* protect tree, count, list */
	/* Protected by tree_lock together with the radix tree */
	unsigned long		nrpages;	/* number of total pages */
	pgoff_t			writeback_index;/* writeback starts here */
	const struct address_space_operations *a_ops;	/* methods */
	unsigned long		flags;		/* error bits/gfp mask */
#ifndef __UBOOT__
	struct backing_dev_info *backing_dev_info; /* device readahead, etc */
#endif
	spinlock_t		private_lock;	/* for use by the address_space */
	struct list_head	private_list;	/* ditto */
	void			*private_data;	/* ditto */
} __attribute__((aligned(sizeof(long))));

/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
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struct inode {
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	umode_t			i_mode;
	unsigned short		i_opflags;
	kuid_t			i_uid;
	kgid_t			i_gid;
	unsigned int		i_flags;

#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
#endif

	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
	struct address_space	*i_mapping;

#ifdef CONFIG_SECURITY
	void			*i_security;
#endif

	/* Stat data, not accessed from path walking */
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	unsigned long		i_ino;
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	/*
	 * Filesystems may only read i_nlink directly.  They shall use the
	 * following functions for modification:
	 *
	 *    (set|clear|inc|drop)_nlink
	 *    inode_(inc|dec)_link_count
	 */
	union {
		const unsigned int i_nlink;
		unsigned int __i_nlink;
	};
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	dev_t			i_rdev;
	loff_t			i_size;
	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
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	unsigned short          i_bytes;
	unsigned int		i_blkbits;
	blkcnt_t		i_blocks;

#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif

	/* Misc */
	unsigned long		i_state;
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	struct mutex		i_mutex;
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	unsigned long		dirtied_when;	/* jiffies of first dirtying */

	struct hlist_node	i_hash;
	struct list_head	i_wb_list;	/* backing dev IO list */
	struct list_head	i_lru;		/* inode LRU list */
	struct list_head	i_sb_list;
	union {
		struct hlist_head	i_dentry;
		struct rcu_head		i_rcu;
	};
	u64			i_version;
	atomic_t		i_count;
	atomic_t		i_dio_count;
	atomic_t		i_writecount;
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	const struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
	struct file_lock	*i_flock;
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	struct address_space	i_data;
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#ifdef CONFIG_QUOTA
	struct dquot		*i_dquot[MAXQUOTAS];
#endif
	struct list_head	i_devices;
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	union {
		struct pipe_inode_info	*i_pipe;
		struct block_device	*i_bdev;
		struct cdev		*i_cdev;
	};
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	__u32			i_generation;

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#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
	struct hlist_head	i_fsnotify_marks;
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#endif

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#ifdef CONFIG_IMA
	atomic_t		i_readcount; /* struct files open RO */
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#endif
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	void			*i_private; /* fs or device private pointer */
};
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struct super_operations {
   	struct inode *(*alloc_inode)(struct super_block *sb);
	void (*destroy_inode)(struct inode *);

   	void (*dirty_inode) (struct inode *, int flags);
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
	int (*drop_inode) (struct inode *);
	void (*evict_inode) (struct inode *);
	void (*put_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
	int (*freeze_fs) (struct super_block *);
	int (*unfreeze_fs) (struct super_block *);
#ifndef __UBOOT__
	int (*statfs) (struct dentry *, struct kstatfs *);
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#endif
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	int (*remount_fs) (struct super_block *, int *, char *);
	void (*umount_begin) (struct super_block *);

#ifndef __UBOOT__
	int (*show_options)(struct seq_file *, struct dentry *);
	int (*show_devname)(struct seq_file *, struct dentry *);
	int (*show_path)(struct seq_file *, struct dentry *);
	int (*show_stats)(struct seq_file *, struct dentry *);
#endif
#ifdef CONFIG_QUOTA
	ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
	ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
#endif
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
	long (*nr_cached_objects)(struct super_block *, int);
	long (*free_cached_objects)(struct super_block *, long, int);
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};

struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
	unsigned char		s_blocksize_bits;
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	unsigned long		s_blocksize;
	loff_t			s_maxbytes;	/* Max file size */
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	struct file_system_type	*s_type;
	const struct super_operations	*s_op;
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	const struct dquot_operations	*dq_op;
	const struct quotactl_ops	*s_qcop;
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	const struct export_operations *s_export_op;
	unsigned long		s_flags;
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	int			s_count;
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	atomic_t		s_active;
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#ifdef CONFIG_SECURITY
	void                    *s_security;
#endif
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	const struct xattr_handler **s_xattr;
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	struct list_head	s_inodes;	/* all inodes */
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#ifndef __UBOOT__
	struct hlist_bl_head	s_anon;		/* anonymous dentries for (nfs) exporting */
#endif
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
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	struct block_device	*s_bdev;
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#ifndef __UBOOT__
	struct backing_dev_info *s_bdi;
#endif
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	struct mtd_info		*s_mtd;
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	struct hlist_node	s_instances;
#ifndef __UBOOT__
	struct quota_info	s_dquot;	/* Diskquota specific options */
#endif
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	struct sb_writers	s_writers;
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	char s_id[32];				/* Informational name */
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	u8 s_uuid[16];				/* UUID */
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	void 			*s_fs_info;	/* Filesystem private info */
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	unsigned int		s_max_links;
#ifndef __UBOOT__
	fmode_t			s_mode;
#endif

	/* Granularity of c/m/atime in ns.
	   Cannot be worse than a second */
	u32		   s_time_gran;
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	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
	struct mutex s_vfs_rename_mutex;	/* Kludge */

	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	char *s_subtype;

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#ifndef __UBOOT__
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	/*
	 * Saved mount options for lazy filesystems using
	 * generic_show_options()
	 */
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	char __rcu *s_options;
#endif
	const struct dentry_operations *s_d_op; /* default d_op for dentries */

	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;

#ifndef __UBOOT__
	struct shrinker s_shrink;	/* per-sb shrinker handle */
#endif

	/* Number of inodes with nlink == 0 but still referenced */
	atomic_long_t s_remove_count;

	/* Being remounted read-only */
	int s_readonly_remount;

	/* AIO completions deferred from interrupt context */
	struct workqueue_struct *s_dio_done_wq;

#ifndef __UBOOT__
	/*
	 * Keep the lru lists last in the structure so they always sit on their
	 * own individual cachelines.
	 */
	struct list_lru		s_dentry_lru ____cacheline_aligned_in_smp;
	struct list_lru		s_inode_lru ____cacheline_aligned_in_smp;
#endif
	struct rcu_head		rcu;
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};

struct file_system_type {
	const char *name;
	int fs_flags;
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#define FS_REQUIRES_DEV		1 
#define FS_BINARY_MOUNTDATA	2
#define FS_HAS_SUBTYPE		4
#define FS_USERNS_MOUNT		8	/* Can be mounted by userns root */
#define FS_USERNS_DEV_MOUNT	16 /* A userns mount does not imply MNT_NODEV */
#define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move() during rename() internally. */
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
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	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
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	struct hlist_head fs_supers;

#ifndef __UBOOT__
	struct lock_class_key s_lock_key;
	struct lock_class_key s_umount_key;
	struct lock_class_key s_vfs_rename_key;
	struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
	struct lock_class_key i_mutex_dir_key;
#endif
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};

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/* include/linux/mount.h */
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struct vfsmount {
	struct dentry *mnt_root;	/* root of the mounted tree */
	struct super_block *mnt_sb;	/* pointer to superblock */
	int mnt_flags;
};

struct path {
	struct vfsmount *mnt;
	struct dentry *dentry;
};

struct file {
	struct path		f_path;
#define f_dentry	f_path.dentry
#define f_vfsmnt	f_path.mnt
	const struct file_operations	*f_op;
	unsigned int 		f_flags;
	loff_t			f_pos;
	unsigned int		f_uid, f_gid;

	u64			f_version;
#ifdef CONFIG_SECURITY
	void			*f_security;
#endif
	/* needed for tty driver, and maybe others */
	void			*private_data;

#ifdef CONFIG_EPOLL
	/* Used by fs/eventpoll.c to link all the hooks to this file */
	struct list_head	f_ep_links;
	spinlock_t		f_ep_lock;
#endif /* #ifdef CONFIG_EPOLL */
#ifdef CONFIG_DEBUG_WRITECOUNT
	unsigned long f_mnt_write_state;
#endif
};

/*
 * get_seconds() not really needed in the read-only implmentation
 */
#define get_seconds()		0

/* 4k page size */
#define PAGE_CACHE_SHIFT	12
#define PAGE_CACHE_SIZE		(1 << PAGE_CACHE_SHIFT)

/* Page cache limit. The filesystems should put that into their s_maxbytes
   limits, otherwise bad things can happen in VM. */
#if BITS_PER_LONG==32
#define MAX_LFS_FILESIZE	(((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
#elif BITS_PER_LONG==64
#define MAX_LFS_FILESIZE 	0x7fffffffffffffffUL
#endif

/*
 * These are the fs-independent mount-flags: up to 32 flags are supported
 */
#define MS_RDONLY	 1	/* Mount read-only */
#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
#define MS_NODEV	 4	/* Disallow access to device special files */
#define MS_NOEXEC	 8	/* Disallow program execution */
#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
#define MS_NOATIME	1024	/* Do not update access times. */
#define MS_NODIRATIME	2048	/* Do not update directory access times */
#define MS_BIND		4096
#define MS_MOVE		8192
#define MS_REC		16384
#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.
				   MS_VERBOSE is deprecated. */
#define MS_SILENT	32768
#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
#define MS_PRIVATE	(1<<18)	/* change to private */
#define MS_SLAVE	(1<<19)	/* change to slave */
#define MS_SHARED	(1<<20)	/* change to shared */
#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */
#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */
#define MS_I_VERSION	(1<<23) /* Update inode I_version field */
#define MS_ACTIVE	(1<<30)
#define MS_NOUSER	(1<<31)

#define I_NEW			8

/* Inode flags - they have nothing to superblock flags now */

#define S_SYNC		1	/* Writes are synced at once */
#define S_NOATIME	2	/* Do not update access times */
#define S_APPEND	4	/* Append-only file */
#define S_IMMUTABLE	8	/* Immutable file */
#define S_DEAD		16	/* removed, but still open directory */
#define S_NOQUOTA	32	/* Inode is not counted to quota */
#define S_DIRSYNC	64	/* Directory modifications are synchronous */
#define S_NOCMTIME	128	/* Do not update file c/mtime */
#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
#define S_PRIVATE	512	/* Inode is fs-internal */

/* include/linux/stat.h */

#define S_IFMT  00170000
#define S_IFSOCK 0140000
#define S_IFLNK	 0120000
#define S_IFREG  0100000
#define S_IFBLK  0060000
#define S_IFDIR  0040000
#define S_IFCHR  0020000
#define S_IFIFO  0010000
#define S_ISUID  0004000
#define S_ISGID  0002000
#define S_ISVTX  0001000

/* include/linux/fs.h */

/*
 * File types
 *
 * NOTE! These match bits 12..15 of stat.st_mode
 * (ie "(i_mode >> 12) & 15").
 */
#define DT_UNKNOWN	0
#define DT_FIFO		1
#define DT_CHR		2
#define DT_DIR		4
#define DT_BLK		6
#define DT_REG		8
#define DT_LNK		10
#define DT_SOCK		12
#define DT_WHT		14

#define I_DIRTY_SYNC		1
#define I_DIRTY_DATASYNC	2
#define I_DIRTY_PAGES		4
#define I_NEW			8
#define I_WILL_FREE		16
#define I_FREEING		32
#define I_CLEAR			64
#define __I_LOCK		7
#define I_LOCK			(1 << __I_LOCK)
#define __I_SYNC		8
#define I_SYNC			(1 << __I_SYNC)

#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)

/* linux/include/dcache.h */

#define DNAME_INLINE_LEN_MIN 36

struct dentry {
	unsigned int d_flags;		/* protected by d_lock */
	spinlock_t d_lock;		/* per dentry lock */
	struct inode *d_inode;		/* Where the name belongs to - NULL is
					 * negative */
	/*
	 * The next three fields are touched by __d_lookup.  Place them here
	 * so they all fit in a cache line.
	 */
	struct hlist_node d_hash;	/* lookup hash list */
	struct dentry *d_parent;	/* parent directory */
	struct qstr d_name;

	struct list_head d_lru;		/* LRU list */
	/*
	 * d_child and d_rcu can share memory
	 */
	struct list_head d_subdirs;	/* our children */
	struct list_head d_alias;	/* inode alias list */
	unsigned long d_time;		/* used by d_revalidate */
	struct super_block *d_sb;	/* The root of the dentry tree */
	void *d_fsdata;			/* fs-specific data */
#ifdef CONFIG_PROFILING
	struct dcookie_struct *d_cookie; /* cookie, if any */
#endif
	int d_mounted;
	unsigned char d_iname[DNAME_INLINE_LEN_MIN];	/* small names */
};

static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

	spin_lock(&dentry->d_lock);
	res = dentry->d_parent->d_inode->i_ino;
	spin_unlock(&dentry->d_lock);
	return res;
}

/* debug.c */

#define module_param_named(...)

/* misc.h */
#define mutex_lock_nested(...)
#define mutex_unlock_nested(...)
#define mutex_is_locked(...)	0
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#endif
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/* Version of this UBIFS implementation */
#define UBIFS_VERSION 1

/* Normal UBIFS messages */
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#define ubifs_msg(c, fmt, ...)                                      \
	pr_notice("UBIFS (ubi%d:%d): " fmt "\n",                    \
		  (c)->vi.ubi_num, (c)->vi.vol_id, ##__VA_ARGS__)
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/* UBIFS error messages */
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#ifndef __UBOOT__
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#define ubifs_err(c, fmt, ...)                                      \
	pr_err("UBIFS error (ubi%d:%d pid %d): %s: " fmt "\n",      \
	       (c)->vi.ubi_num, (c)->vi.vol_id, current->pid,       \
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	       __func__, ##__VA_ARGS__)
/* UBIFS warning messages */
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#define ubifs_warn(c, fmt, ...)                                     \
	pr_warn("UBIFS warning (ubi%d:%d pid %d): %s: " fmt "\n",   \
		(c)->vi.ubi_num, (c)->vi.vol_id, current->pid,      \
		__func__, ##__VA_ARGS__)
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#else
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#define ubifs_err(c, fmt, ...)                                      \
	pr_err("UBIFS error (ubi%d:%d pid %d): %s: " fmt "\n",      \
	       (c)->vi.ubi_num, (c)->vi.vol_id, 0,                  \
	       __func__, ##__VA_ARGS__)
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/* UBIFS warning messages */
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#define ubifs_warn(c, fmt, ...)                                     \
	pr_warn("UBIFS warning (ubi%d:%d pid %d): %s: " fmt "\n",   \
		(c)->vi.ubi_num, (c)->vi.vol_id, 0,                 \
		__func__, ##__VA_ARGS__)

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#endif
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/*
 * A variant of 'ubifs_err()' which takes the UBIFS file-sytem description
 * object as an argument.
 */
#define ubifs_errc(c, fmt, ...)                                     \
	do {                                                        \
		if (!(c)->probing)                                  \
			ubifs_err(c, fmt, ##__VA_ARGS__);           \
	} while (0)

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/* UBIFS file system VFS magic number */
#define UBIFS_SUPER_MAGIC 0x24051905

/* Number of UBIFS blocks per VFS page */
#define UBIFS_BLOCKS_PER_PAGE (PAGE_CACHE_SIZE / UBIFS_BLOCK_SIZE)
#define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_CACHE_SHIFT - UBIFS_BLOCK_SHIFT)

/* "File system end of life" sequence number watermark */
#define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL
#define SQNUM_WATERMARK      0xFFFFFFFFFF000000ULL

/*
 * Minimum amount of LEBs reserved for the index. At present the index needs at
 * least 2 LEBs: one for the index head and one for in-the-gaps method (which
 * currently does not cater for the index head and so excludes it from
 * consideration).
 */
#define MIN_INDEX_LEBS 2

/* Minimum amount of data UBIFS writes to the flash */
#define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8)

/*
 * Currently we do not support inode number overlapping and re-using, so this
 * watermark defines dangerous inode number level. This should be fixed later,
 * although it is difficult to exceed current limit. Another option is to use
 * 64-bit inode numbers, but this means more overhead.
 */
#define INUM_WARN_WATERMARK 0xFFF00000
#define INUM_WATERMARK      0xFFFFFF00

/* Maximum number of entries in each LPT (LEB category) heap */
#define LPT_HEAP_SZ 256

/*
 * Background thread name pattern. The numbers are UBI device and volume
 * numbers.
 */
#define BGT_NAME_PATTERN "ubifs_bgt%d_%d"

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/* Write-buffer synchronization timeout interval in seconds */
#define WBUF_TIMEOUT_SOFTLIMIT 3
#define WBUF_TIMEOUT_HARDLIMIT 5
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/* Maximum possible inode number (only 32-bit inodes are supported now) */
#define MAX_INUM 0xFFFFFFFF

/* Number of non-data journal heads */
#define NONDATA_JHEADS_CNT 2

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/* Shorter names for journal head numbers for internal usage */
#define GCHD   UBIFS_GC_HEAD
#define BASEHD UBIFS_BASE_HEAD
#define DATAHD UBIFS_DATA_HEAD
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/* 'No change' value for 'ubifs_change_lp()' */
#define LPROPS_NC 0x80000001

/*
 * There is no notion of truncation key because truncation nodes do not exist
 * in TNC. However, when replaying, it is handy to introduce fake "truncation"
 * keys for truncation nodes because the code becomes simpler. So we define
 * %UBIFS_TRUN_KEY type.
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 *
 * But otherwise, out of the journal reply scope, the truncation keys are
 * invalid.
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 */
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#define UBIFS_TRUN_KEY    UBIFS_KEY_TYPES_CNT
#define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT
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/*
 * How much a directory entry/extended attribute entry adds to the parent/host
 * inode.
 */
#define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8)

/* How much an extended attribute adds to the host inode */
#define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8)

/*
 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered
 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are
 * considered "young". This is used by shrinker when selecting znode to trim
 * off.
 */
#define OLD_ZNODE_AGE 20
#define YOUNG_ZNODE_AGE 5

/*
 * Some compressors, like LZO, may end up with more data then the input buffer.
 * So UBIFS always allocates larger output buffer, to be sure the compressor
 * will not corrupt memory in case of worst case compression.
 */
#define WORST_COMPR_FACTOR 2

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/*
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 * How much memory is needed for a buffer where we compress a data node.
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 */
#define COMPRESSED_DATA_NODE_BUF_SZ \
	(UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR)

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/* Maximum expected tree height for use by bottom_up_buf */
#define BOTTOM_UP_HEIGHT 64

/* Maximum number of data nodes to bulk-read */
#define UBIFS_MAX_BULK_READ 32

/*
 * Lockdep classes for UBIFS inode @ui_mutex.
 */
enum {
	WB_MUTEX_1 = 0,
	WB_MUTEX_2 = 1,
	WB_MUTEX_3 = 2,
};

/*
 * Znode flags (actually, bit numbers which store the flags).
 *
 * DIRTY_ZNODE: znode is dirty
 * COW_ZNODE: znode is being committed and a new instance of this znode has to
 *            be created before changing this znode
 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is
 *                 still in the commit list and the ongoing commit operation
 *                 will commit it, and delete this znode after it is done
 */
enum {
	DIRTY_ZNODE    = 0,
	COW_ZNODE      = 1,
	OBSOLETE_ZNODE = 2,
};

/*
 * Commit states.
 *
 * COMMIT_RESTING: commit is not wanted
 * COMMIT_BACKGROUND: background commit has been requested
 * COMMIT_REQUIRED: commit is required
 * COMMIT_RUNNING_BACKGROUND: background commit is running
 * COMMIT_RUNNING_REQUIRED: commit is running and it is required
 * COMMIT_BROKEN: commit failed
 */
enum {
	COMMIT_RESTING = 0,
	COMMIT_BACKGROUND,
	COMMIT_REQUIRED,
	COMMIT_RUNNING_BACKGROUND,
	COMMIT_RUNNING_REQUIRED,
	COMMIT_BROKEN,
};

/*
 * 'ubifs_scan_a_node()' return values.
 *
 * SCANNED_GARBAGE:  scanned garbage
 * SCANNED_EMPTY_SPACE: scanned empty space
 * SCANNED_A_NODE: scanned a valid node
 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node
 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length
 *
 * Greater than zero means: 'scanned that number of padding bytes'
 */
enum {
	SCANNED_GARBAGE        = 0,
	SCANNED_EMPTY_SPACE    = -1,
	SCANNED_A_NODE         = -2,
	SCANNED_A_CORRUPT_NODE = -3,
	SCANNED_A_BAD_PAD_NODE = -4,
};

/*
 * LPT cnode flag bits.
 *
 * DIRTY_CNODE: cnode is dirty
 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted),
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 *                 so it can (and must) be freed when the commit is finished
 * COW_CNODE: cnode is being committed and must be copied before writing
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 */
enum {
	DIRTY_CNODE    = 0,
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	OBSOLETE_CNODE = 1,
	COW_CNODE      = 2,
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};

/*
 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes.
 *
 * LTAB_DIRTY: ltab node is dirty
 * LSAVE_DIRTY: lsave node is dirty
 */
enum {
	LTAB_DIRTY  = 1,
	LSAVE_DIRTY = 2,
};

/*
 * Return codes used by the garbage collector.
 * @LEB_FREED: the logical eraseblock was freed and is ready to use
 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit
 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes
 */
enum {
	LEB_FREED,
	LEB_FREED_IDX,
	LEB_RETAINED,
};

/**
 * struct ubifs_old_idx - index node obsoleted since last commit start.
 * @rb: rb-tree node
 * @lnum: LEB number of obsoleted index node
 * @offs: offset of obsoleted index node
 */
struct ubifs_old_idx {
	struct rb_node rb;
	int lnum;
	int offs;
};

/* The below union makes it easier to deal with keys */
union ubifs_key {
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	uint8_t u8[UBIFS_SK_LEN];
	uint32_t u32[UBIFS_SK_LEN/4];
	uint64_t u64[UBIFS_SK_LEN/8];
	__le32 j32[UBIFS_SK_LEN/4];
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};

/**
 * struct ubifs_scan_node - UBIFS scanned node information.
 * @list: list of scanned nodes
 * @key: key of node scanned (if it has one)
 * @sqnum: sequence number
 * @type: type of node scanned
 * @offs: offset with LEB of node scanned
 * @len: length of node scanned
 * @node: raw node
 */
struct ubifs_scan_node {
	struct list_head list;
	union ubifs_key key;
	unsigned long long sqnum;
	int type;
	int offs;
	int len;
	void *node;
};

/**
 * struct ubifs_scan_leb - UBIFS scanned LEB information.
 * @lnum: logical eraseblock number
 * @nodes_cnt: number of nodes scanned
 * @nodes: list of struct ubifs_scan_node
 * @endpt: end point (and therefore the start of empty space)
 * @buf: buffer containing entire LEB scanned
 */
struct ubifs_scan_leb {
	int lnum;
	int nodes_cnt;
	struct list_head nodes;
	int endpt;
	void *buf;
};

/**
 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB.
 * @list: list
 * @lnum: LEB number
 * @unmap: OK to unmap this LEB
 *
 * This data structure is used to temporary store garbage-collected indexing
 * LEBs - they are not released immediately, but only after the next commit.
 * This is needed to guarantee recoverability.
 */
struct ubifs_gced_idx_leb {
	struct list_head list;
	int lnum;
	int unmap;
};

/**
 * struct ubifs_inode - UBIFS in-memory inode description.
 * @vfs_inode: VFS inode description object
 * @creat_sqnum: sequence number at time of creation
 * @del_cmtno: commit number corresponding to the time the inode was deleted,
 *             protected by @c->commit_sem;
 * @xattr_size: summarized size of all extended attributes in bytes
 * @xattr_cnt: count of extended attributes this inode has
 * @xattr_names: sum of lengths of all extended attribute names belonging to
 *               this inode
 * @dirty: non-zero if the inode is dirty
 * @xattr: non-zero if this is an extended attribute inode
 * @bulk_read: non-zero if bulk-read should be used
 * @ui_mutex: serializes inode write-back with the rest of VFS operations,
 *            serializes "clean <-> dirty" state changes, serializes bulk-read,
 *            protects @dirty, @bulk_read, @ui_size, and @xattr_size
 * @ui_lock: protects @synced_i_size
 * @synced_i_size: synchronized size of inode, i.e. the value of inode size
 *                 currently stored on the flash; used only for regular file
 *                 inodes
 * @ui_size: inode size used by UBIFS when writing to flash
 * @flags: inode flags (@UBIFS_COMPR_FL, etc)
 * @compr_type: default compression type used for this inode
 * @last_page_read: page number of last page read (for bulk read)
 * @read_in_a_row: number of consecutive pages read in a row (for bulk read)
 * @data_len: length of the data attached to the inode
 * @data: inode's data
 *
 * @ui_mutex exists for two main reasons. At first it prevents inodes from
 * being written back while UBIFS changing them, being in the middle of an VFS
 * operation. This way UBIFS makes sure the inode fields are consistent. For
 * example, in 'ubifs_rename()' we change 3 inodes simultaneously, and
 * write-back must not write any of them before we have finished.
 *
 * The second reason is budgeting - UBIFS has to budget all operations. If an
 * operation is going to mark an inode dirty, it has to allocate budget for
 * this. It cannot just mark it dirty because there is no guarantee there will
 * be enough flash space to write the inode back later. This means UBIFS has
 * to have full control over inode "clean <-> dirty" transitions (and pages
 * actually). But unfortunately, VFS marks inodes dirty in many places, and it
 * does not ask the file-system if it is allowed to do so (there is a notifier,
 * but it is not enough), i.e., there is no mechanism to synchronize with this.
 * So UBIFS has its own inode dirty flag and its own mutex to serialize
 * "clean <-> dirty" transitions.
 *
 * The @synced_i_size field is used to make sure we never write pages which are
 * beyond last synchronized inode size. See 'ubifs_writepage()' for more
 * information.
 *
 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses
 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot
 * make sure @inode->i_size is always changed under @ui_mutex, because it
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 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would
 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields
 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one
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 * could consider to rework locking and base it on "shadow" fields.
 */
struct ubifs_inode {
	struct inode vfs_inode;
	unsigned long long creat_sqnum;
	unsigned long long del_cmtno;
	unsigned int xattr_size;
	unsigned int xattr_cnt;
	unsigned int xattr_names;
	unsigned int dirty:1;
	unsigned int xattr:1;
	unsigned int bulk_read:1;
	unsigned int compr_type:2;
	struct mutex ui_mutex;
	spinlock_t ui_lock;
	loff_t synced_i_size;
	loff_t ui_size;
	int flags;
	pgoff_t last_page_read;
	pgoff_t read_in_a_row;
	int data_len;
	void *data;
};

/**
 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode.
 * @list: list
 * @lnum: LEB number of recovered LEB
 * @endpt: offset where recovery ended
 *
 * This structure records a LEB identified during recovery that needs to be
 * cleaned but was not because UBIFS was mounted read-only. The information
 * is used to clean the LEB when remounting to read-write mode.
 */
struct ubifs_unclean_leb {
	struct list_head list;
	int lnum;
	int endpt;
};

/*
 * LEB properties flags.
 *
 * LPROPS_UNCAT: not categorized
 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index
 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index
 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index
 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs
 * LPROPS_EMPTY: LEB is empty, not taken
 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken
 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken
 * LPROPS_CAT_MASK: mask for the LEB categories above
 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media)
 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash)
 */
enum {
	LPROPS_UNCAT     =  0,
	LPROPS_DIRTY     =  1,
	LPROPS_DIRTY_IDX =  2,
	LPROPS_FREE      =  3,
	LPROPS_HEAP_CNT  =  3,
	LPROPS_EMPTY     =  4,
	LPROPS_FREEABLE  =  5,
	LPROPS_FRDI_IDX  =  6,
	LPROPS_CAT_MASK  = 15,
	LPROPS_TAKEN     = 16,
	LPROPS_INDEX     = 32,
};

/**
 * struct ubifs_lprops - logical eraseblock properties.
 * @free: amount of free space in bytes
 * @dirty: amount of dirty space in bytes
 * @flags: LEB properties flags (see above)
 * @lnum: LEB number
 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE)
 * @hpos: heap position in heap of same-category lprops (other categories)
 */
struct ubifs_lprops {
	int free;
	int dirty;
	int flags;
	int lnum;
	union {
		struct list_head list;
		int hpos;
	};
};

/**
 * struct ubifs_lpt_lprops - LPT logical eraseblock properties.
 * @free: amount of free space in bytes
 * @dirty: amount of dirty space in bytes
 * @tgc: trivial GC flag (1 => unmap after commit end)
 * @cmt: commit flag (1 => reserved for commit)
 */
struct ubifs_lpt_lprops {
	int free;
	int dirty;
	unsigned tgc:1;
	unsigned cmt:1;
};

/**
 * struct ubifs_lp_stats - statistics of eraseblocks in the main area.
 * @empty_lebs: number of empty LEBs
 * @taken_empty_lebs: number of taken LEBs
 * @idx_lebs: number of indexing LEBs
 * @total_free: total free space in bytes (includes all LEBs)
 * @total_dirty: total dirty space in bytes (includes all LEBs)
 * @total_used: total used space in bytes (does not include index LEBs)
 * @total_dead: total dead space in bytes (does not include index LEBs)
 * @total_dark: total dark space in bytes (does not include index LEBs)
 *
 * The @taken_empty_lebs field counts the LEBs that are in the transient state
 * of having been "taken" for use but not yet written to. @taken_empty_lebs is
 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be
 * used by itself (in which case 'unused_lebs' would be a better name). In the
 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained
 * by GC, but unlike other empty LEBs that are "taken", it may not be written
 * straight away (i.e. before the next commit start or unmount), so either
 * @gc_lnum must be specially accounted for, or the current approach followed
 * i.e. count it under @taken_empty_lebs.
 *
 * @empty_lebs includes @taken_empty_lebs.
 *
 * @total_used, @total_dead and @total_dark fields do not account indexing
 * LEBs.
 */
struct ubifs_lp_stats {
	int empty_lebs;
	int taken_empty_lebs;
	int idx_lebs;
	long long total_free;
	long long total_dirty;
	long long total_used;
	long long total_dead;
	long long total_dark;
};

struct ubifs_nnode;

/**
 * struct ubifs_cnode - LEB Properties Tree common node.
 * @parent: parent nnode
 * @cnext: next cnode to commit
 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
 * @iip: index in parent
 * @level: level in the tree (zero for pnodes, greater than zero for nnodes)
 * @num: node number
 */
struct ubifs_cnode {
	struct ubifs_nnode *parent;
	struct ubifs_cnode *cnext;
	unsigned long flags;
	int iip;
	int level;
	int num;
};

/**
 * struct ubifs_pnode - LEB Properties Tree leaf node.
 * @parent: parent nnode
 * @cnext: next cnode to commit
 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
 * @iip: index in parent
 * @level: level in the tree (always zero for pnodes)
 * @num: node number
 * @lprops: LEB properties array
 */
struct ubifs_pnode {
	struct ubifs_nnode *parent;
	struct ubifs_cnode *cnext;
	unsigned long flags;
	int iip;
	int level;
	int num;
	struct ubifs_lprops lprops[UBIFS_LPT_FANOUT];
};

/**
 * struct ubifs_nbranch - LEB Properties Tree internal node branch.
 * @lnum: LEB number of child
 * @offs: offset of child
 * @nnode: nnode child
 * @pnode: pnode child
 * @cnode: cnode child
 */
struct ubifs_nbranch {
	int lnum;
	int offs;
	union {
		struct ubifs_nnode *nnode;
		struct ubifs_pnode *pnode;
		struct ubifs_cnode *cnode;
	};
};

/**
 * struct ubifs_nnode - LEB Properties Tree internal node.
 * @parent: parent nnode
 * @cnext: next cnode to commit
 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
 * @iip: index in parent
 * @level: level in the tree (always greater than zero for nnodes)
 * @num: node number
 * @nbranch: branches to child nodes
 */
struct ubifs_nnode {
	struct ubifs_nnode *parent;
	struct ubifs_cnode *cnext;
	unsigned long flags;
	int iip;
	int level;
	int num;
	struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT];
};

/**
 * struct ubifs_lpt_heap - heap of categorized lprops.
 * @arr: heap array
 * @cnt: number in heap
 * @max_cnt: maximum number allowed in heap
 *
 * There are %LPROPS_HEAP_CNT heaps.
 */
struct ubifs_lpt_heap {
	struct ubifs_lprops **arr;
	int cnt;
	int max_cnt;
};

/*
 * Return codes for LPT scan callback function.
 *
 * LPT_SCAN_CONTINUE: continue scanning
 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory
 * LPT_SCAN_STOP: stop scanning
 */
enum {
	LPT_SCAN_CONTINUE = 0,
	LPT_SCAN_ADD = 1,
	LPT_SCAN_STOP = 2,
};

struct ubifs_info;

/* Callback used by the 'ubifs_lpt_scan_nolock()' function */
typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c,
				       const struct ubifs_lprops *lprops,
				       int in_tree, void *data);

/**
 * struct ubifs_wbuf - UBIFS write-buffer.
 * @c: UBIFS file-system description object
 * @buf: write-buffer (of min. flash I/O unit size)
 * @lnum: logical eraseblock number the write-buffer points to
 * @offs: write-buffer offset in this logical eraseblock
 * @avail: number of bytes available in the write-buffer
 * @used:  number of used bytes in the write-buffer
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 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range)
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 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep
 *         up by 'mutex_lock_nested()).
 * @sync_callback: write-buffer synchronization callback
 * @io_mutex: serializes write-buffer I/O
 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
 *        fields
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 * @softlimit: soft write-buffer timeout interval
1260
 * @delta: hard and soft timeouts delta (the timer expire interval is @softlimit
1261
 *         and @softlimit + @delta)
1262
 * @timer: write-buffer timer
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 * @no_timer: non-zero if this write-buffer does not have a timer
 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing
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 * @next_ino: points to the next position of the following inode number
 * @inodes: stores the inode numbers of the nodes which are in wbuf
 *
 * The write-buffer synchronization callback is called when the write-buffer is
 * synchronized in order to notify how much space was wasted due to
 * write-buffer padding and how much free space is left in the LEB.
 *
 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under
 * spin-lock or mutex because they are written under both mutex and spin-lock.
 * @buf is appended to under mutex but overwritten under both mutex and
 * spin-lock. Thus the data between @buf and @buf + @used can be read under
 * spinlock.
 */
struct ubifs_wbuf {
	struct ubifs_info *c;
	void *buf;
	int lnum;
	int offs;
	int avail;
	int used;
1285
	int size;
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	int jhead;
	int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
	struct mutex io_mutex;
	spinlock_t lock;
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//	ktime_t softlimit;
//	unsigned long long delta;
//	struct hrtimer timer;
	unsigned int no_timer:1;
	unsigned int need_sync:1;
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	int next_ino;
	ino_t *inodes;
};

/**
 * struct ubifs_bud - bud logical eraseblock.
 * @lnum: logical eraseblock number
 * @start: where the (uncommitted) bud data starts
 * @jhead: journal head number this bud belongs to
 * @list: link in the list buds belonging to the same journal head
 * @rb: link in the tree of all buds
 */
struct ubifs_bud {
	int lnum;
	int start;
	int jhead;
	struct list_head list;
	struct rb_node rb;
};

/**
 * struct ubifs_jhead - journal head.
 * @wbuf: head's write-buffer
 * @buds_list: list of bud LEBs belonging to this journal head
1319
 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head
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 *
 * Note, the @buds list is protected by the @c->buds_lock.
 */
struct ubifs_jhead {
	struct ubifs_wbuf wbuf;
	struct list_head buds_list;
1326
	unsigned int grouped:1;
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};

/**
 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes.
 * @key: key
 * @znode: znode address in memory
 * @lnum: LEB number of the target node (indexing node or data node)
 * @offs: target node offset within @lnum
 * @len: target node length
 */
struct ubifs_zbranch {
	union ubifs_key key;
	union {
		struct ubifs_znode *znode;
		void *leaf;
	};
	int lnum;
	int offs;
	int len;
};

/**
 * struct ubifs_znode - in-memory representation of an indexing node.
 * @parent: parent znode or NULL if it is the root
 * @cnext: next znode to commit
 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE)
 * @time: last access time (seconds)
 * @level: level of the entry in the TNC tree
 * @child_cnt: count of child znodes
 * @iip: index in parent's zbranch array
 * @alt: lower bound of key range has altered i.e. child inserted at slot 0
 * @lnum: LEB number of the corresponding indexing node
 * @offs: offset of the corresponding indexing node
 * @len: length  of the corresponding indexing node
 * @zbranch: array of znode branches (@c->fanout elements)
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 *
 * Note! The @lnum, @offs, and @len fields are not really needed - we have them
 * only for internal consistency check. They could be removed to save some RAM.
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 */
struct ubifs_znode {
	struct ubifs_znode *parent;
	struct ubifs_znode *cnext;
	unsigned long flags;
	unsigned long time;
	int level;
	int child_cnt;
	int iip;
	int alt;
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	int lnum;
	int offs;
	int len;
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	struct ubifs_zbranch zbranch[];
};

/**
 * struct bu_info - bulk-read information.
 * @key: first data node key
 * @zbranch: zbranches of data nodes to bulk read
 * @buf: buffer to read into
 * @buf_len: buffer length
 * @gc_seq: GC sequence number to detect races with GC
 * @cnt: number of data nodes for bulk read
 * @blk_cnt: number of data blocks including holes
 * @oef: end of file reached
 */
struct bu_info {
	union ubifs_key key;
	struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ];
	void *buf;
	int buf_len;
	int gc_seq;
	int cnt;
	int blk_cnt;
	int eof;
};

/**
 * struct ubifs_node_range - node length range description data structure.
 * @len: fixed node length
 * @min_len: minimum possible node length
 * @max_len: maximum possible node length
 *
 * If @max_len is %0, the node has fixed length @len.
 */
struct ubifs_node_range {
	union {
		int len;
		int min_len;
	};
	int max_len;
};

/**
 * struct ubifs_compressor - UBIFS compressor description structure.
 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc)
 * @cc: cryptoapi compressor handle
 * @comp_mutex: mutex used during compression
 * @decomp_mutex: mutex used during decompression
 * @name: compressor name
 * @capi_name: cryptoapi compressor name
 */
struct ubifs_compressor {
	int compr_type;
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	struct crypto_comp *cc;
	struct mutex *comp_mutex;
	struct mutex *decomp_mutex;
	const char *name;
	const char *capi_name;
#ifdef __UBOOT__
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	int (*decompress)(const unsigned char *in, size_t in_len,
			  unsigned char *out, size_t *out_len);
1438
#endif
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};

/**
 * struct ubifs_budget_req - budget requirements of an operation.
 *
 * @fast: non-zero if the budgeting should try to acquire budget quickly and
 *        should not try to call write-back
 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields
 *               have to be re-calculated
 * @new_page: non-zero if the operation adds a new page
 * @dirtied_page: non-zero if the operation makes a page dirty
 * @new_dent: non-zero if the operation adds a new directory entry
 * @mod_dent: non-zero if the operation removes or modifies an existing
 *            directory entry
 * @new_ino: non-zero if the operation adds a new inode
 * @new_ino_d: now much data newly created inode contains
 * @dirtied_ino: how many inodes the operation makes dirty
 * @dirtied_ino_d: now much data dirtied inode contains
 * @idx_growth: how much the index will supposedly grow
 * @data_growth: how much new data the operation will supposedly add
 * @dd_growth: how much data that makes other data dirty the operation will
 *             supposedly add
 *
 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The
 * budgeting subsystem caches index and data growth values there to avoid
 * re-calculating them when the budget is released. However, if @idx_growth is
 * %-1, it is calculated by the release function using other fields.
 *
 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d
 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made
 * dirty by the re-name operation.
 *
 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to
 * make sure the amount of inode data which contribute to @new_ino_d and
 * @dirtied_ino_d fields are aligned.
 */
struct ubifs_budget_req {
	unsigned int fast:1;
	unsigned int recalculate:1;
#ifndef UBIFS_DEBUG
	unsigned int new_page:1;
	unsigned int dirtied_page:1;
	unsigned int new_dent:1;
	unsigned int mod_dent:1;
	unsigned int new_ino:1;
	unsigned int new_ino_d:13;
	unsigned int dirtied_ino:4;
	unsigned int dirtied_ino_d:15;
#else
	/* Not bit-fields to check for overflows */
	unsigned int new_page;
	unsigned int dirtied_page;
	unsigned int new_dent;
	unsigned int mod_dent;
	unsigned int new_ino;
	unsigned int new_ino_d;
	unsigned int dirtied_ino;
	unsigned int dirtied_ino_d;
#endif
	int idx_growth;
	int data_growth;
	int dd_growth;
};

/**
 * struct ubifs_orphan - stores the inode number of an orphan.
 * @rb: rb-tree node of rb-tree of orphans sorted by inode number
 * @list: list head of list of orphans in order added
 * @new_list: list head of list of orphans added since the last commit
 * @cnext: next orphan to commit
 * @dnext: next orphan to delete
 * @inum: inode number
 * @new: %1 => added since the last commit, otherwise %0
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 * @cmt: %1 => commit pending, otherwise %0
 * @del: %1 => delete pending, otherwise %0
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 */
struct ubifs_orphan {
	struct rb_node rb;
	struct list_head list;
	struct list_head new_list;
	struct ubifs_orphan *cnext;
	struct ubifs_orphan *dnext;
	ino_t inum;
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	unsigned new:1;
	unsigned cmt:1;
	unsigned del:1;
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};

/**
 * struct ubifs_mount_opts - UBIFS-specific mount options information.
 * @unmount_mode: selected unmount mode (%0 default, %1 normal, %2 fast)
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 * @bulk_read: enable/disable bulk-reads (%0 default, %1 disable, %2 enable)
1531
 * @chk_data_crc: enable/disable CRC data checking when reading data nodes
1532
 *                (%0 default, %1 disable, %2 enable)
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 * @override_compr: override default compressor (%0 - do not override and use
 *                  superblock compressor, %1 - override and use compressor
 *                  specified in @compr_type)
 * @compr_type: compressor type to override the superblock compressor with
 *              (%UBIFS_COMPR_NONE, etc)
 */
struct ubifs_mount_opts {
	unsigned int unmount_mode:2;
	unsigned int bulk_read:2;
	unsigned int chk_data_crc:2;
	unsigned int override_compr:1;
	unsigned int compr_type:2;
};

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/**
 * struct ubifs_budg_info - UBIFS budgeting information.
 * @idx_growth: amount of bytes budgeted for index growth
 * @data_growth: amount of bytes budgeted for cached data
 * @dd_growth: amount of bytes budgeted for cached data that will make
 *             other data dirty
 * @uncommitted_idx: amount of bytes were budgeted for growth of the index, but
 *                   which still have to be taken into account because the index
 *                   has not been committed so far
 * @old_idx_sz: size of index on flash
 * @min_idx_lebs: minimum number of LEBs required for the index
 * @nospace: non-zero if the file-system does not have flash space (used as
 *           optimization)
 * @nospace_rp: the same as @nospace, but additionally means that even reserved
 *              pool is full
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 * @page_budget: budget for a page (constant, never changed after mount)
 * @inode_budget: budget for an inode (constant, never changed after mount)
 * @dent_budget: budget for a directory entry (constant, never changed after
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 *               mount)
 */
struct ubifs_budg_info {
	long long idx_growth;
	long long data_growth;
	long long dd_growth;
	long long uncommitted_idx;
	unsigned long long old_idx_sz;
	int min_idx_lebs;
	unsigned int nospace:1;
	unsigned int nospace_rp:1;
	int page_budget;
	int inode_budget;
	int dent_budget;
};

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struct ubifs_debug_info;

/**
 * struct ubifs_info - UBIFS file-system description data structure
 * (per-superblock).
 * @vfs_sb: VFS @struct super_block object
 * @bdi: backing device info object to make VFS happy and disable read-ahead
 *
 * @highest_inum: highest used inode number
 * @max_sqnum: current global sequence number
 * @cmt_no: commit number of the last successfully completed commit, protected
 *          by @commit_sem
 * @cnt_lock: protects @highest_inum and @max_sqnum counters
 * @fmt_version: UBIFS on-flash format version
1595
 * @ro_compat_version: R/O compatibility version
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 * @uuid: UUID from super block
 *
 * @lhead_lnum: log head logical eraseblock number
 * @lhead_offs: log head offset
 * @ltail_lnum: log tail logical eraseblock number (offset is always 0)
 * @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and
 *             @bud_bytes
 * @min_log_bytes: minimum required number of bytes in the log
 * @cmt_bud_bytes: used during commit to temporarily amount of bytes in
 *                 committed buds
 *
 * @buds: tree of all buds indexed by bud LEB number
 * @bud_bytes: how many bytes of flash is used by buds
 * @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud
 *             lists
 * @jhead_cnt: count of journal heads
 * @jheads: journal heads (head zero is base head)
 * @max_bud_bytes: maximum number of bytes allowed in buds
 * @bg_bud_bytes: number of bud bytes when background commit is initiated
 * @old_buds: buds to be released after commit ends
 * @max_bud_cnt: maximum number of buds
 *
 * @commit_sem: synchronizes committer with other processes
 * @cmt_state: commit state
 * @cs_lock: commit state lock
 * @cmt_wq: wait queue to sleep on if the log is full and a commit is running
 *
 * @big_lpt: flag that LPT is too big to write whole during commit
1624
 * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up
1625 1626 1627 1628
 * @no_chk_data_crc: do not check CRCs when reading data nodes (except during
 *                   recovery)
 * @bulk_read: enable bulk-reads
 * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc)
1629
 * @rw_incompat: the media is not R/W compatible
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 *
 * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and
 *             @calc_idx_sz
 * @zroot: zbranch which points to the root index node and znode
 * @cnext: next znode to commit
 * @enext: next znode to commit to empty space
 * @gap_lebs: array of LEBs used by the in-gaps commit method
 * @cbuf: commit buffer
 * @ileb_buf: buffer for commit in-the-gaps method
 * @ileb_len: length of data in ileb_buf
 * @ihead_lnum: LEB number of index head
 * @ihead_offs: offset of index head
 * @ilebs: pre-allocated index LEBs
 * @ileb_cnt: number of pre-allocated index LEBs
 * @ileb_nxt: next pre-allocated index LEBs
 * @old_idx: tree of index nodes obsoleted since the last commit start
 * @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c
 *
 * @mst_node: master node
 * @mst_offs: offset of valid master node
 *
 * @max_bu_buf_len: maximum bulk-read buffer length
 * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu
 * @bu: pre-allocated bulk-read information
 *
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 * @write_reserve_mutex: protects @write_reserve_buf
 * @write_reserve_buf: on the write path we allocate memory, which might
 *                     sometimes be unavailable, in which case we use this
 *                     write reserve buffer
 *
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 * @log_lebs: number of logical eraseblocks in the log
 * @log_bytes: log size in bytes
 * @log_last: last LEB of the log
 * @lpt_lebs: number of LEBs used for lprops table
 * @lpt_first: first LEB of the lprops table area
 * @lpt_last: last LEB of the lprops table area
 * @orph_lebs: number of LEBs used for the orphan area
 * @orph_first: first LEB of the orphan area
 * @orph_last: last LEB of the orphan area
 * @main_lebs: count of LEBs in the main area
 * @main_first: first LEB of the main area
 * @main_bytes: main area size in bytes
 *
 * @key_hash_type: type of the key hash
 * @key_hash: direntry key hash function
 * @key_fmt: key format
 * @key_len: key length
 * @fanout: fanout of the index tree (number of links per indexing node)
 *
 * @min_io_size: minimal input/output unit size
 * @min_io_shift: number of bits in @min_io_size minus one
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 * @max_write_size: maximum amount of bytes the underlying flash can write at a
 *                  time (MTD write buffer size)
 * @max_write_shift: number of bits in @max_write_size minus one
1684
 * @leb_size: logical eraseblock size in bytes
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 * @leb_start: starting offset of logical eraseblocks within physical
 *             eraseblocks
1687
 * @half_leb_size: half LEB size
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 * @idx_leb_size: how many bytes of an LEB are effectively available when it is
 *                used to store indexing nodes (@leb_size - @max_idx_node_sz)
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 * @leb_cnt: count of logical eraseblocks
 * @max_leb_cnt: maximum count of logical eraseblocks
 * @old_leb_cnt: count of logical eraseblocks before re-size
 * @ro_media: the underlying UBI volume is read-only
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 * @ro_mount: the file-system was mounted as read-only
 * @ro_error: UBIFS switched to R/O mode because an error happened
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 *
 * @dirty_pg_cnt: number of dirty pages (not used)
 * @dirty_zn_cnt: number of dirty znodes
 * @clean_zn_cnt: number of clean znodes
 *
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 * @space_lock: protects @bi and @lst
 * @lst: lprops statistics
 * @bi: budgeting information
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 * @calc_idx_sz: temporary variable which is used to calculate new index size
 *               (contains accurate new index size at end of TNC commit start)
 *
 * @ref_node_alsz: size of the LEB reference node aligned to the min. flash
1708
 *                 I/O unit
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 * @mst_node_alsz: master node aligned size
 * @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary
 * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary
 * @max_inode_sz: maximum possible inode size in bytes
 * @max_znode_sz: size of znode in bytes
 *
 * @leb_overhead: how many bytes are wasted in an LEB when it is filled with
 *                data nodes of maximum size - used in free space reporting
 * @dead_wm: LEB dead space watermark
 * @dark_wm: LEB dark space watermark
 * @block_cnt: count of 4KiB blocks on the FS
 *
 * @ranges: UBIFS node length ranges
 * @ubi: UBI volume descriptor
 * @di: UBI device information
 * @vi: UBI volume information
 *
 * @orph_tree: rb-tree of orphan inode numbers
 * @orph_list: list of orphan inode numbers in order added
 * @orph_new: list of orphan inode numbers added since last commit
 * @orph_cnext: next orphan to commit
 * @orph_dnext: next orphan to delete
 * @orphan_lock: lock for orph_tree and orph_new
 * @orph_buf: buffer for orphan nodes
 * @new_orphans: number of orphans since last commit
 * @cmt_orphans: number of orphans being committed
 * @tot_orphans: number of orphans in the rb_tree
 * @max_orphans: maximum number of orphans allowed
 * @ohead_lnum: orphan head LEB number
 * @ohead_offs: orphan head offset
 * @no_orphs: non-zero if there are no orphans
 *
 * @bgt: UBIFS background thread
 * @bgt_name: background thread name
 * @need_bgt: if background thread should run
 * @need_wbuf_sync: if write-buffers have to be synchronized
 *
 * @gc_lnum: LEB number used for garbage collection
 * @sbuf: a buffer of LEB size used by GC and replay for scanning
 * @idx_gc: list of index LEBs that have been garbage collected
 * @idx_gc_cnt: number of elements on the idx_gc list
 * @gc_seq: incremented for every non-index LEB garbage collected
 * @gced_lnum: last non-index LEB that was garbage collected
 *
 * @infos_list: links all 'ubifs_info' objects
 * @umount_mutex: serializes shrinker and un-mount
 * @shrinker_run_no: shrinker run number
 *
 * @space_bits: number of bits needed to record free or dirty space
 * @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT
 * @lpt_offs_bits: number of bits needed to record an offset in the LPT
 * @lpt_spc_bits: number of bits needed to space in the LPT
 * @pcnt_bits: number of bits needed to record pnode or nnode number
 * @lnum_bits: number of bits needed to record LEB number
 * @nnode_sz: size of on-flash nnode
 * @pnode_sz: size of on-flash pnode
 * @ltab_sz: size of on-flash LPT lprops table
 * @lsave_sz: size of on-flash LPT save table
 * @pnode_cnt: number of pnodes
 * @nnode_cnt: number of nnodes
 * @lpt_hght: height of the LPT
 * @pnodes_have: number of pnodes in memory
 *
 * @lp_mutex: protects lprops table and all the other lprops-related fields
 * @lpt_lnum: LEB number of the root nnode of the LPT
 * @lpt_offs: offset of the root nnode of the LPT
 * @nhead_lnum: LEB number of LPT head
 * @nhead_offs: offset of LPT head
 * @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab
 * @dirty_nn_cnt: number of dirty nnodes
 * @dirty_pn_cnt: number of dirty pnodes
 * @check_lpt_free: flag that indicates LPT GC may be needed
 * @lpt_sz: LPT size
 * @lpt_nod_buf: buffer for an on-flash nnode or pnode
 * @lpt_buf: buffer of LEB size used by LPT
 * @nroot: address in memory of the root nnode of the LPT
 * @lpt_cnext: next LPT node to commit
 * @lpt_heap: array of heaps of categorized lprops
 * @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at
 *             previous commit start
 * @uncat_list: list of un-categorized LEBs
 * @empty_list: list of empty LEBs
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 * @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size)
 * @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size)
1793
 * @freeable_cnt: number of freeable LEBs in @freeable_list
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 * @in_a_category_cnt: count of lprops which are in a certain category, which
 *                     basically meants that they were loaded from the flash
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
 *
 * @ltab_lnum: LEB number of LPT's own lprops table
 * @ltab_offs: offset of LPT's own lprops table
 * @ltab: LPT's own lprops table
 * @ltab_cmt: LPT's own lprops table (commit copy)
 * @lsave_cnt: number of LEB numbers in LPT's save table
 * @lsave_lnum: LEB number of LPT's save table
 * @lsave_offs: offset of LPT's save table
 * @lsave: LPT's save table
 * @lscan_lnum: LEB number of last LPT scan
 *
 * @rp_size: size of the reserved pool in bytes
 * @report_rp_size: size of the reserved pool reported to user-space
 * @rp_uid: reserved pool user ID
 * @rp_gid: reserved pool group ID
 *
1812 1813 1814 1815
 * @empty: %1 if the UBI device is empty
 * @need_recovery: %1 if the file-system needs recovery
 * @replaying: %1 during journal replay
 * @mounting: %1 while mounting
1816
 * @probing: %1 while attempting to mount if MS_SILENT mount flag is set
1817
 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode
1818 1819 1820 1821
 * @replay_list: temporary list used during journal replay
 * @replay_buds: list of buds to replay
 * @cs_sqnum: sequence number of first node in the log (commit start node)
 * @replay_sqnum: sequence number of node currently being replayed
1822 1823 1824 1825
 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W
 *                    mode
 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted
 *                  FS to R/W mode
1826 1827 1828 1829 1830 1831 1832
 * @size_tree: inode size information for recovery
 * @mount_opts: UBIFS-specific mount options
 *
 * @dbg: debugging-related information
 */
struct ubifs_info {
	struct super_block *vfs_sb;
1833 1834 1835
#ifndef __UBOOT__
	struct backing_dev_info bdi;
#endif
1836 1837 1838 1839 1840 1841

	ino_t highest_inum;
	unsigned long long max_sqnum;
	unsigned long long cmt_no;
	spinlock_t cnt_lock;
	int fmt_version;
1842
	int ro_compat_version;
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	unsigned char uuid[16];

	int lhead_lnum;
	int lhead_offs;
	int ltail_lnum;
	struct mutex log_mutex;
	int min_log_bytes;
	long long cmt_bud_bytes;

	struct rb_root buds;
	long long bud_bytes;
	spinlock_t buds_lock;
	int jhead_cnt;
	struct ubifs_jhead *jheads;
	long long max_bud_bytes;
	long long bg_bud_bytes;
	struct list_head old_buds;
	int max_bud_cnt;

	struct rw_semaphore commit_sem;
	int cmt_state;
	spinlock_t cs_lock;
	wait_queue_head_t cmt_wq;

	unsigned int big_lpt:1;
1868
	unsigned int space_fixup:1;
1869 1870 1871
	unsigned int no_chk_data_crc:1;
	unsigned int bulk_read:1;
	unsigned int default_compr:2;
1872
	unsigned int rw_incompat:1;
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896

	struct mutex tnc_mutex;
	struct ubifs_zbranch zroot;
	struct ubifs_znode *cnext;
	struct ubifs_znode *enext;
	int *gap_lebs;
	void *cbuf;
	void *ileb_buf;
	int ileb_len;
	int ihead_lnum;
	int ihead_offs;
	int *ilebs;
	int ileb_cnt;
	int ileb_nxt;
	struct rb_root old_idx;
	int *bottom_up_buf;

	struct ubifs_mst_node *mst_node;
	int mst_offs;

	int max_bu_buf_len;
	struct mutex bu_mutex;
	struct bu_info bu;

1897 1898 1899
	struct mutex write_reserve_mutex;
	void *write_reserve_buf;

1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
	int log_lebs;
	long long log_bytes;
	int log_last;
	int lpt_lebs;
	int lpt_first;
	int lpt_last;
	int orph_lebs;
	int orph_first;
	int orph_last;
	int main_lebs;
	int main_first;
	long long main_bytes;

	uint8_t key_hash_type;
	uint32_t (*key_hash)(const char *str, int len);
	int key_fmt;
	int key_len;
	int fanout;

	int min_io_size;
	int min_io_shift;
1921 1922
	int max_write_size;
	int max_write_shift;
1923
	int leb_size;
1924
	int leb_start;
1925
	int half_leb_size;
1926
	int idx_leb_size;
1927 1928 1929
	int leb_cnt;
	int max_leb_cnt;
	int old_leb_cnt;
1930 1931 1932 1933 1934 1935 1936
	unsigned int ro_media:1;
	unsigned int ro_mount:1;
	unsigned int ro_error:1;

	atomic_long_t dirty_pg_cnt;
	atomic_long_t dirty_zn_cnt;
	atomic_long_t clean_zn_cnt;
1937 1938 1939

	spinlock_t space_lock;
	struct ubifs_lp_stats lst;
1940 1941
	struct ubifs_budg_info bi;
	unsigned long long calc_idx_sz;
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026

	int ref_node_alsz;
	int mst_node_alsz;
	int min_idx_node_sz;
	int max_idx_node_sz;
	long long max_inode_sz;
	int max_znode_sz;

	int leb_overhead;
	int dead_wm;
	int dark_wm;
	int block_cnt;

	struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT];
	struct ubi_volume_desc *ubi;
	struct ubi_device_info di;
	struct ubi_volume_info vi;

	struct rb_root orph_tree;
	struct list_head orph_list;
	struct list_head orph_new;
	struct ubifs_orphan *orph_cnext;
	struct ubifs_orphan *orph_dnext;
	spinlock_t orphan_lock;
	void *orph_buf;
	int new_orphans;
	int cmt_orphans;
	int tot_orphans;
	int max_orphans;
	int ohead_lnum;
	int ohead_offs;
	int no_orphs;

	struct task_struct *bgt;
	char bgt_name[sizeof(BGT_NAME_PATTERN) + 9];
	int need_bgt;
	int need_wbuf_sync;

	int gc_lnum;
	void *sbuf;
	struct list_head idx_gc;
	int idx_gc_cnt;
	int gc_seq;
	int gced_lnum;

	struct list_head infos_list;
	struct mutex umount_mutex;
	unsigned int shrinker_run_no;

	int space_bits;
	int lpt_lnum_bits;
	int lpt_offs_bits;
	int lpt_spc_bits;
	int pcnt_bits;
	int lnum_bits;
	int nnode_sz;
	int pnode_sz;
	int ltab_sz;
	int lsave_sz;
	int pnode_cnt;
	int nnode_cnt;
	int lpt_hght;
	int pnodes_have;

	struct mutex lp_mutex;
	int lpt_lnum;
	int lpt_offs;
	int nhead_lnum;
	int nhead_offs;
	int lpt_drty_flgs;
	int dirty_nn_cnt;
	int dirty_pn_cnt;
	int check_lpt_free;
	long long lpt_sz;
	void *lpt_nod_buf;
	void *lpt_buf;
	struct ubifs_nnode *nroot;
	struct ubifs_cnode *lpt_cnext;
	struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT];
	struct ubifs_lpt_heap dirty_idx;
	struct list_head uncat_list;
	struct list_head empty_list;
	struct list_head freeable_list;
	struct list_head frdi_idx_list;
	int freeable_cnt;
2027
	int in_a_category_cnt;
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040

	int ltab_lnum;
	int ltab_offs;
	struct ubifs_lpt_lprops *ltab;
	struct ubifs_lpt_lprops *ltab_cmt;
	int lsave_cnt;
	int lsave_lnum;
	int lsave_offs;
	int *lsave;
	int lscan_lnum;

	long long rp_size;
	long long report_rp_size;
2041 2042
	kuid_t rp_uid;
	kgid_t rp_gid;
2043 2044

	/* The below fields are used only during mounting and re-mounting */
2045 2046 2047 2048 2049
	unsigned int empty:1;
	unsigned int need_recovery:1;
	unsigned int replaying:1;
	unsigned int mounting:1;
	unsigned int remounting_rw:1;
2050
	unsigned int probing:1;
2051 2052 2053 2054 2055 2056 2057 2058 2059
	struct list_head replay_list;
	struct list_head replay_buds;
	unsigned long long cs_sqnum;
	unsigned long long replay_sqnum;
	struct list_head unclean_leb_list;
	struct ubifs_mst_node *rcvrd_mst_node;
	struct rb_root size_tree;
	struct ubifs_mount_opts mount_opts;

2060
#ifndef __UBOOT__
2061 2062 2063 2064
	struct ubifs_debug_info *dbg;
#endif
};

2065
extern struct list_head ubifs_infos;
2066
extern spinlock_t ubifs_infos_lock;
2067
extern atomic_long_t ubifs_clean_zn_cnt;
2068 2069
extern struct kmem_cache *ubifs_inode_slab;
extern const struct super_operations ubifs_super_operations;
2070
extern const struct xattr_handler *ubifs_xattr_handlers[];
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081
extern const struct address_space_operations ubifs_file_address_operations;
extern const struct file_operations ubifs_file_operations;
extern const struct inode_operations ubifs_file_inode_operations;
extern const struct file_operations ubifs_dir_operations;
extern const struct inode_operations ubifs_dir_inode_operations;
extern const struct inode_operations ubifs_symlink_inode_operations;
extern struct backing_dev_info ubifs_backing_dev_info;
extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];

/* io.c */
void ubifs_ro_mode(struct ubifs_info *c, int err);
2082 2083 2084 2085 2086 2087 2088 2089
int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
		   int len, int even_ebadmsg);
int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
		    int len);
int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
int ubifs_leb_unmap(struct ubifs_info *c, int lnum);
int ubifs_leb_map(struct ubifs_info *c, int lnum);
int ubifs_is_mapped(const struct ubifs_info *c, int lnum);
2090
int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len);
2091
int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs);
2092 2093 2094 2095 2096 2097
int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf);
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
		    int lnum, int offs);
int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
			 int lnum, int offs);
int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum,
2098
		     int offs);
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int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
		     int offs, int quiet, int must_chk_crc);
void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad);
void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last);
int ubifs_io_init(struct ubifs_info *c);
void ubifs_pad(const struct ubifs_info *c, void *buf, int pad);
int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf);
int ubifs_bg_wbufs_sync(struct ubifs_info *c);
void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum);
int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode);

/* scan.c */
struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
2112
				  int offs, void *sbuf, int quiet);
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void ubifs_scan_destroy(struct ubifs_scan_leb *sleb);
int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
		      int offs, int quiet);
struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum,
					int offs, void *sbuf);
void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
		    int lnum, int offs);
int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
		   void *buf, int offs);
void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
			      void *buf);

/* log.c */
void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud);
void ubifs_create_buds_lists(struct ubifs_info *c);
int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs);
struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum);
struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum);
int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum);
int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum);
int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum);
int ubifs_consolidate_log(struct ubifs_info *c);

/* journal.c */
int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
		     const struct qstr *nm, const struct inode *inode,
		     int deletion, int xent);
int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
			 const union ubifs_key *key, const void *buf, int len);
int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode);
int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode);
int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
		     const struct dentry *old_dentry,
		     const struct inode *new_dir,
		     const struct dentry *new_dentry, int sync);
int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
		       loff_t old_size, loff_t new_size);
int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
			   const struct inode *inode, const struct qstr *nm);
int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1,
			   const struct inode *inode2);

/* budget.c */
int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req);
void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req);
void ubifs_release_dirty_inode_budget(struct ubifs_info *c,
				      struct ubifs_inode *ui);
int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode,
			  struct ubifs_budget_req *req);
void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode,
				struct ubifs_budget_req *req);
void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode,
			 struct ubifs_budget_req *req);
long long ubifs_get_free_space(struct ubifs_info *c);
long long ubifs_get_free_space_nolock(struct ubifs_info *c);
int ubifs_calc_min_idx_lebs(struct ubifs_info *c);
void ubifs_convert_page_budget(struct ubifs_info *c);
long long ubifs_reported_space(const struct ubifs_info *c, long long free);
long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs);

/* find.c */
2174
int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs,
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			  int squeeze);
int ubifs_find_free_leb_for_idx(struct ubifs_info *c);
int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp,
			 int min_space, int pick_free);
int ubifs_find_dirty_idx_leb(struct ubifs_info *c);
int ubifs_save_dirty_idx_lnums(struct ubifs_info *c);

/* tnc.c */
int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
			struct ubifs_znode **zn, int *n);
int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
			void *node, const struct qstr *nm);
int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key,
		     void *node, int *lnum, int *offs);
int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
		  int offs, int len);
int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key,
		      int old_lnum, int old_offs, int lnum, int offs, int len);
int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
		     int lnum, int offs, int len, const struct qstr *nm);
int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key);
int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key,
			const struct qstr *nm);
int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key,
			   union ubifs_key *to_key);
int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum);
struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c,
					   union ubifs_key *key,
					   const struct qstr *nm);
void ubifs_tnc_close(struct ubifs_info *c);
int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level,
		       int lnum, int offs, int is_idx);
int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level,
			 int lnum, int offs);
/* Shared by tnc.c for tnc_commit.c */
void destroy_old_idx(struct ubifs_info *c);
int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level,
		       int lnum, int offs);
int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode);
int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu);
int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu);

/* tnc_misc.c */
struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr,
					      struct ubifs_znode *znode);
int ubifs_search_zbranch(const struct ubifs_info *c,
			 const struct ubifs_znode *znode,
			 const union ubifs_key *key, int *n);
struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode);
struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode);
long ubifs_destroy_tnc_subtree(struct ubifs_znode *zr);
struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c,
				     struct ubifs_zbranch *zbr,
				     struct ubifs_znode *parent, int iip);
int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr,
			void *node);

/* tnc_commit.c */
int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot);
int ubifs_tnc_end_commit(struct ubifs_info *c);

2236
#ifndef __UBOOT__
2237
/* shrinker.c */
2238 2239 2240 2241 2242
unsigned long ubifs_shrink_scan(struct shrinker *shrink,
				struct shrink_control *sc);
unsigned long ubifs_shrink_count(struct shrinker *shrink,
				 struct shrink_control *sc);
#endif
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/* commit.c */
int ubifs_bg_thread(void *info);
void ubifs_commit_required(struct ubifs_info *c);
void ubifs_request_bg_commit(struct ubifs_info *c);
int ubifs_run_commit(struct ubifs_info *c);
void ubifs_recovery_commit(struct ubifs_info *c);
int ubifs_gc_should_commit(struct ubifs_info *c);
void ubifs_wait_for_commit(struct ubifs_info *c);

/* master.c */
int ubifs_read_master(struct ubifs_info *c);
int ubifs_write_master(struct ubifs_info *c);

/* sb.c */
int ubifs_read_superblock(struct ubifs_info *c);
struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c);
int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup);
2261
int ubifs_fixup_free_space(struct ubifs_info *c);
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/* replay.c */
int ubifs_validate_entry(struct ubifs_info *c,
			 const struct ubifs_dent_node *dent);
int ubifs_replay_journal(struct ubifs_info *c);

/* gc.c */
int ubifs_garbage_collect(struct ubifs_info *c, int anyway);
int ubifs_gc_start_commit(struct ubifs_info *c);
int ubifs_gc_end_commit(struct ubifs_info *c);
void ubifs_destroy_idx_gc(struct ubifs_info *c);
int ubifs_get_idx_gc_leb(struct ubifs_info *c);
int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp);

/* orphan.c */
int ubifs_add_orphan(struct ubifs_info *c, ino_t inum);
void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum);
int ubifs_orphan_start_commit(struct ubifs_info *c);
int ubifs_orphan_end_commit(struct ubifs_info *c);
int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only);
int ubifs_clear_orphans(struct ubifs_info *c);

/* lpt.c */
int ubifs_calc_lpt_geom(struct ubifs_info *c);
int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
			  int *lpt_lebs, int *big_lpt);
int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr);
struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum);
struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum);
int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
			  ubifs_lpt_scan_callback scan_cb, void *data);

/* Shared by lpt.c for lpt_commit.c */
void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave);
void ubifs_pack_ltab(struct ubifs_info *c, void *buf,
		     struct ubifs_lpt_lprops *ltab);
void ubifs_pack_pnode(struct ubifs_info *c, void *buf,
		      struct ubifs_pnode *pnode);
void ubifs_pack_nnode(struct ubifs_info *c, void *buf,
		      struct ubifs_nnode *nnode);
struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
				    struct ubifs_nnode *parent, int iip);
struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c,
				    struct ubifs_nnode *parent, int iip);
int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip);
void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty);
void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode);
uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits);
struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght);
/* Needed only in debugging code in lpt_commit.c */
int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf,
		       struct ubifs_nnode *nnode);

/* lpt_commit.c */
int ubifs_lpt_start_commit(struct ubifs_info *c);
int ubifs_lpt_end_commit(struct ubifs_info *c);
int ubifs_lpt_post_commit(struct ubifs_info *c);
void ubifs_lpt_free(struct ubifs_info *c, int wr_only);

/* lprops.c */
const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
					   const struct ubifs_lprops *lp,
					   int free, int dirty, int flags,
					   int idx_gc_cnt);
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst);
void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
		      int cat);
void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
		       struct ubifs_lprops *new_lprops);
void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops);
int ubifs_categorize_lprops(const struct ubifs_info *c,
			    const struct ubifs_lprops *lprops);
int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
			int flags_set, int flags_clean, int idx_gc_cnt);
int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
			int flags_set, int flags_clean);
int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp);
const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c);
2343
int ubifs_calc_dark(const struct ubifs_info *c, int spc);
2344 2345

/* file.c */
2346
int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
2347 2348 2349 2350
int ubifs_setattr(struct dentry *dentry, struct iattr *attr);

/* dir.c */
struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
2351
			      umode_t mode);
2352 2353 2354 2355 2356 2357 2358 2359 2360 2361
int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
		  struct kstat *stat);

/* xattr.c */
int ubifs_setxattr(struct dentry *dentry, const char *name,
		   const void *value, size_t size, int flags);
ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf,
		       size_t size);
ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int ubifs_removexattr(struct dentry *dentry, const char *name);
2362 2363
int ubifs_init_security(struct inode *dentry, struct inode *inode,
			const struct qstr *qstr);
2364 2365 2366 2367 2368 2369 2370 2371 2372

/* super.c */
struct inode *ubifs_iget(struct super_block *sb, unsigned long inum);
int ubifs_iput(struct inode *inode);

/* recovery.c */
int ubifs_recover_master_node(struct ubifs_info *c);
int ubifs_write_rcvrd_mst_node(struct ubifs_info *c);
struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
2373
					 int offs, void *sbuf, int jhead);
2374 2375
struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
					     int offs, void *sbuf);
2376 2377
int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf);
int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf);
2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392
int ubifs_rcvry_gc_commit(struct ubifs_info *c);
int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key,
			     int deletion, loff_t new_size);
int ubifs_recover_size(struct ubifs_info *c);
void ubifs_destroy_size_tree(struct ubifs_info *c);

/* ioctl.c */
long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
void ubifs_set_inode_flags(struct inode *inode);
#ifdef CONFIG_COMPAT
long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#endif

/* compressor.c */
int __init ubifs_compressors_init(void);
2393
void ubifs_compressors_exit(void);
2394 2395 2396 2397
void ubifs_compress(const struct ubifs_info *c, const void *in_buf, int in_len,
		    void *out_buf, int *out_len, int *compr_type);
int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len,
		     void *out, int *out_len, int compr_type);
2398

2399 2400 2401 2402 2403
#include "debug.h"
#include "misc.h"
#include "key.h"

#ifdef __UBOOT__
2404
void ubifs_umount(struct ubifs_info *c);
2405
#endif
2406
#endif /* !__UBIFS_H__ */