mirror of https://gitee.com/openkylin/linux.git
149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/*
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* JFFS -- Journaling Flash File System, Linux implementation.
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*
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* Copyright (C) 1999, 2000 Axis Communications AB.
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*
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* Created by Finn Hakansson <finn@axis.com>.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* $Id: jffs_fm.h,v 1.13 2001/01/11 12:03:25 dwmw2 Exp $
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*
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* Ported to Linux 2.3.x and MTD:
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* Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB
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*
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*/
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#ifndef __LINUX_JFFS_FM_H__
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#define __LINUX_JFFS_FM_H__
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#include <linux/types.h>
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#include <linux/jffs.h>
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#include <linux/mtd/mtd.h>
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#include <linux/config.h>
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/* The alignment between two nodes in the flash memory. */
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#define JFFS_ALIGN_SIZE 4
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/* Mark the on-flash space as obsolete when appropriate. */
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#define JFFS_MARK_OBSOLETE 0
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#ifndef CONFIG_JFFS_FS_VERBOSE
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#define CONFIG_JFFS_FS_VERBOSE 1
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#endif
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#if CONFIG_JFFS_FS_VERBOSE > 0
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#define D(x) x
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#define D1(x) D(x)
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#else
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#define D(x)
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#define D1(x)
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#endif
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#if CONFIG_JFFS_FS_VERBOSE > 1
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#define D2(x) D(x)
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#else
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#define D2(x)
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#endif
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#if CONFIG_JFFS_FS_VERBOSE > 2
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#define D3(x) D(x)
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#else
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#define D3(x)
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#endif
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#define ASSERT(x) x
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/* How many padding bytes should be inserted between two chunks of data
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on the flash? */
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#define JFFS_GET_PAD_BYTES(size) ( (JFFS_ALIGN_SIZE-1) & -(__u32)(size) )
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#define JFFS_PAD(size) ( (size + (JFFS_ALIGN_SIZE-1)) & ~(JFFS_ALIGN_SIZE-1) )
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struct jffs_node_ref
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{
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struct jffs_node *node;
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struct jffs_node_ref *next;
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};
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/* The struct jffs_fm represents a chunk of data in the flash memory. */
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struct jffs_fm
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{
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__u32 offset;
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__u32 size;
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struct jffs_fm *prev;
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struct jffs_fm *next;
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struct jffs_node_ref *nodes; /* USED if != 0. */
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};
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struct jffs_fmcontrol
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{
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__u32 flash_size;
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__u32 used_size;
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__u32 dirty_size;
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__u32 free_size;
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__u32 sector_size;
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__u32 min_free_size; /* The minimum free space needed to be able
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to perform garbage collections. */
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__u32 max_chunk_size; /* The maximum size of a chunk of data. */
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struct mtd_info *mtd;
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struct jffs_control *c;
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struct jffs_fm *head;
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struct jffs_fm *tail;
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struct jffs_fm *head_extra;
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struct jffs_fm *tail_extra;
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struct semaphore biglock;
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};
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/* Notice the two members head_extra and tail_extra in the jffs_control
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structure above. Those are only used during the scanning of the flash
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memory; while the file system is being built. If the data in the flash
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memory is organized like
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+----------------+------------------+----------------+
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| USED / DIRTY | FREE | USED / DIRTY |
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+----------------+------------------+----------------+
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then the scan is split in two parts. The first scanned part of the
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flash memory is organized through the members head and tail. The
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second scanned part is organized with head_extra and tail_extra. When
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the scan is completed, the two lists are merged together. The jffs_fm
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struct that head_extra references is the logical beginning of the
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flash memory so it will be referenced by the head member. */
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struct jffs_fmcontrol *jffs_build_begin(struct jffs_control *c, int unit);
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void jffs_build_end(struct jffs_fmcontrol *fmc);
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void jffs_cleanup_fmcontrol(struct jffs_fmcontrol *fmc);
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int jffs_fmalloc(struct jffs_fmcontrol *fmc, __u32 size,
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struct jffs_node *node, struct jffs_fm **result);
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int jffs_fmfree(struct jffs_fmcontrol *fmc, struct jffs_fm *fm,
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struct jffs_node *node);
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__u32 jffs_free_size1(struct jffs_fmcontrol *fmc);
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__u32 jffs_free_size2(struct jffs_fmcontrol *fmc);
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void jffs_sync_erase(struct jffs_fmcontrol *fmc, int erased_size);
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struct jffs_fm *jffs_cut_node(struct jffs_fmcontrol *fmc, __u32 size);
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struct jffs_node *jffs_get_oldest_node(struct jffs_fmcontrol *fmc);
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long jffs_erasable_size(struct jffs_fmcontrol *fmc);
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struct jffs_fm *jffs_fmalloced(struct jffs_fmcontrol *fmc, __u32 offset,
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__u32 size, struct jffs_node *node);
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int jffs_add_node(struct jffs_node *node);
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void jffs_fmfree_partly(struct jffs_fmcontrol *fmc, struct jffs_fm *fm,
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__u32 size);
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void jffs_print_fmcontrol(struct jffs_fmcontrol *fmc);
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void jffs_print_fm(struct jffs_fm *fm);
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#if 0
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void jffs_print_node_ref(struct jffs_node_ref *ref);
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#endif /* 0 */
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#endif /* __LINUX_JFFS_FM_H__ */
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