mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
224 lines
8.1 KiB
C
224 lines
8.1 KiB
C
/*
|
|
* JFFS -- Journalling Flash File System, Linux implementation.
|
|
*
|
|
* Copyright (C) 1999, 2000 Axis Communications AB.
|
|
*
|
|
* Created by Finn Hakansson <finn@axis.com>.
|
|
*
|
|
* This is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* $Id: jffs.h,v 1.20 2001/09/18 21:33:37 dwmw2 Exp $
|
|
*
|
|
* Ported to Linux 2.3.x and MTD:
|
|
* Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB
|
|
*
|
|
*/
|
|
|
|
#ifndef __LINUX_JFFS_H__
|
|
#define __LINUX_JFFS_H__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/completion.h>
|
|
|
|
#define JFFS_VERSION_STRING "1.0"
|
|
|
|
/* This is a magic number that is used as an identification number for
|
|
this file system. It is written to the super_block structure. */
|
|
#define JFFS_MAGIC_SB_BITMASK 0x07c0 /* 1984 */
|
|
|
|
/* This is a magic number that every on-flash raw inode begins with. */
|
|
#define JFFS_MAGIC_BITMASK 0x34383931 /* "1984" */
|
|
|
|
/* These two bitmasks are the valid ones for the flash memories we have
|
|
for the moment. */
|
|
#define JFFS_EMPTY_BITMASK 0xffffffff
|
|
#define JFFS_DIRTY_BITMASK 0x00000000
|
|
|
|
/* This is the inode number of the root node. */
|
|
#define JFFS_MIN_INO 1
|
|
|
|
/* How many slots in the file hash table should we have? */
|
|
#define JFFS_HASH_SIZE 40
|
|
|
|
/* Don't use more than 254 bytes as the maximum allowed length of a file's
|
|
name due to errors that could occur during the scanning of the flash
|
|
memory. In fact, a name length of 255 or 0xff, could be the result of
|
|
an uncompleted write. For instance, if a raw inode is written to the
|
|
flash memory and there is a power lossage just before the length of
|
|
the name is written, the length 255 would be interpreted as an illegal
|
|
value. */
|
|
#define JFFS_MAX_NAME_LEN 254
|
|
|
|
/* Commands for ioctl(). */
|
|
#define JFFS_IOCTL_MAGIC 't'
|
|
#define JFFS_PRINT_HASH _IO(JFFS_IOCTL_MAGIC, 90)
|
|
#define JFFS_PRINT_TREE _IO(JFFS_IOCTL_MAGIC, 91)
|
|
#define JFFS_GET_STATUS _IO(JFFS_IOCTL_MAGIC, 92)
|
|
|
|
/* XXX: This is something that we should try to get rid of in the future. */
|
|
#define JFFS_MODIFY_INODE 0x01
|
|
#define JFFS_MODIFY_NAME 0x02
|
|
#define JFFS_MODIFY_DATA 0x04
|
|
#define JFFS_MODIFY_EXIST 0x08
|
|
|
|
struct jffs_control;
|
|
|
|
/* The JFFS raw inode structure: Used for storage on physical media. */
|
|
/* Perhaps the uid, gid, atime, mtime and ctime members should have
|
|
more space due to future changes in the Linux kernel. Anyhow, since
|
|
a user of this filesystem probably have to fix a large number of
|
|
other things, we have decided to not be forward compatible. */
|
|
struct jffs_raw_inode
|
|
{
|
|
__u32 magic; /* A constant magic number. */
|
|
__u32 ino; /* Inode number. */
|
|
__u32 pino; /* Parent's inode number. */
|
|
__u32 version; /* Version number. */
|
|
__u32 mode; /* The file's type or mode. */
|
|
__u16 uid; /* The file's owner. */
|
|
__u16 gid; /* The file's group. */
|
|
__u32 atime; /* Last access time. */
|
|
__u32 mtime; /* Last modification time. */
|
|
__u32 ctime; /* Creation time. */
|
|
__u32 offset; /* Where to begin to write. */
|
|
__u32 dsize; /* Size of the node's data. */
|
|
__u32 rsize; /* How much are going to be replaced? */
|
|
__u8 nsize; /* Name length. */
|
|
__u8 nlink; /* Number of links. */
|
|
__u8 spare : 6; /* For future use. */
|
|
__u8 rename : 1; /* Rename to a name of an already existing file? */
|
|
__u8 deleted : 1; /* Has this file been deleted? */
|
|
__u8 accurate; /* The inode is obsolete if accurate == 0. */
|
|
__u32 dchksum; /* Checksum for the data. */
|
|
__u16 nchksum; /* Checksum for the name. */
|
|
__u16 chksum; /* Checksum for the raw inode. */
|
|
};
|
|
|
|
/* Define the offset of the accurate byte in struct jffs_raw_inode. */
|
|
#define JFFS_RAW_INODE_ACCURATE_OFFSET (sizeof(struct jffs_raw_inode) \
|
|
- 2 * sizeof(__u32) - sizeof(__u8))
|
|
|
|
/* Define the offset of the chksum member in struct jffs_raw_inode. */
|
|
#define JFFS_RAW_INODE_CHKSUM_OFFSET (sizeof(struct jffs_raw_inode) \
|
|
- sizeof(__u16))
|
|
|
|
/* Define the offset of the dchksum member in struct jffs_raw_inode. */
|
|
#define JFFS_RAW_INODE_DCHKSUM_OFFSET (sizeof(struct jffs_raw_inode) \
|
|
- sizeof(__u16) - sizeof(__u16) \
|
|
- sizeof(__u32))
|
|
|
|
|
|
/* The RAM representation of the node. The names of pointers to
|
|
jffs_nodes are very often just called `n' in the source code. */
|
|
struct jffs_node
|
|
{
|
|
__u32 ino; /* Inode number. */
|
|
__u32 version; /* Version number. */
|
|
__u32 data_offset; /* Logic location of the data to insert. */
|
|
__u32 data_size; /* The amount of data this node inserts. */
|
|
__u32 removed_size; /* The amount of data that this node removes. */
|
|
__u32 fm_offset; /* Physical location of the data in the actual
|
|
flash memory data chunk. */
|
|
__u8 name_size; /* Size of the name. */
|
|
struct jffs_fm *fm; /* Physical memory information. */
|
|
struct jffs_node *version_prev;
|
|
struct jffs_node *version_next;
|
|
struct jffs_node *range_prev;
|
|
struct jffs_node *range_next;
|
|
};
|
|
|
|
|
|
/* The RAM representation of a file (plain files, directories,
|
|
links, etc.). Pointers to jffs_files are normally named `f'
|
|
in the JFFS source code. */
|
|
struct jffs_file
|
|
{
|
|
__u32 ino; /* Inode number. */
|
|
__u32 pino; /* Parent's inode number. */
|
|
__u32 mode; /* file_type, mode */
|
|
__u16 uid; /* owner */
|
|
__u16 gid; /* group */
|
|
__u32 atime; /* Last access time. */
|
|
__u32 mtime; /* Last modification time. */
|
|
__u32 ctime; /* Creation time. */
|
|
__u8 nsize; /* Name length. */
|
|
__u8 nlink; /* Number of links. */
|
|
__u8 deleted; /* Has this file been deleted? */
|
|
char *name; /* The name of this file; NULL-terminated. */
|
|
__u32 size; /* The total size of the file's data. */
|
|
__u32 highest_version; /* The highest version number of this file. */
|
|
struct jffs_control *c;
|
|
struct jffs_file *parent; /* Reference to the parent directory. */
|
|
struct jffs_file *children; /* Always NULL for plain files. */
|
|
struct jffs_file *sibling_prev; /* Siblings in the same directory. */
|
|
struct jffs_file *sibling_next;
|
|
struct list_head hash; /* hash list. */
|
|
struct jffs_node *range_head; /* The final data. */
|
|
struct jffs_node *range_tail; /* The first data. */
|
|
struct jffs_node *version_head; /* The youngest node. */
|
|
struct jffs_node *version_tail; /* The oldest node. */
|
|
};
|
|
|
|
|
|
/* This is just a definition of a simple list used for keeping track of
|
|
files deleted due to a rename. This list is only used during the
|
|
mounting of the file system and only if there have been rename operations
|
|
earlier. */
|
|
struct jffs_delete_list
|
|
{
|
|
__u32 ino;
|
|
struct jffs_delete_list *next;
|
|
};
|
|
|
|
|
|
/* A struct for the overall file system control. Pointers to
|
|
jffs_control structs are named `c' in the source code. */
|
|
struct jffs_control
|
|
{
|
|
struct super_block *sb; /* Reference to the VFS super block. */
|
|
struct jffs_file *root; /* The root directory file. */
|
|
struct list_head *hash; /* Hash table for finding files by ino. */
|
|
struct jffs_fmcontrol *fmc; /* Flash memory control structure. */
|
|
__u32 hash_len; /* The size of the hash table. */
|
|
__u32 next_ino; /* Next inode number to use for new files. */
|
|
__u16 building_fs; /* Is the file system being built right now? */
|
|
struct jffs_delete_list *delete_list; /* Track deleted files. */
|
|
pid_t thread_pid; /* GC thread's PID */
|
|
struct task_struct *gc_task; /* GC task struct */
|
|
struct completion gc_thread_comp; /* GC thread exit mutex */
|
|
__u32 gc_minfree_threshold; /* GC trigger thresholds */
|
|
__u32 gc_maxdirty_threshold;
|
|
};
|
|
|
|
|
|
/* Used to inform about flash status. */
|
|
struct jffs_flash_status
|
|
{
|
|
__u32 size;
|
|
__u32 used;
|
|
__u32 dirty;
|
|
__u32 begin;
|
|
__u32 end;
|
|
};
|
|
|
|
/* This stuff could be used for finding memory leaks. */
|
|
#define JFFS_MEMORY_DEBUG 0
|
|
|
|
extern long no_jffs_node;
|
|
#if defined(JFFS_MEMORY_DEBUG) && JFFS_MEMORY_DEBUG
|
|
extern long no_jffs_control;
|
|
extern long no_jffs_raw_inode;
|
|
extern long no_jffs_node_ref;
|
|
extern long no_jffs_fm;
|
|
extern long no_jffs_fmcontrol;
|
|
extern long no_hash;
|
|
extern long no_name;
|
|
#define DJM(x) x
|
|
#else
|
|
#define DJM(x)
|
|
#endif
|
|
|
|
#endif /* __LINUX_JFFS_H__ */
|