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Diffstat (limited to 'fs/jffs/jffs_fm.h')
| -rw-r--r-- | fs/jffs/jffs_fm.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/fs/jffs/jffs_fm.h b/fs/jffs/jffs_fm.h new file mode 100644 index 0000000..bc291c4 --- /dev/null +++ b/fs/jffs/jffs_fm.h @@ -0,0 +1,148 @@ +/* + * JFFS -- Journaling 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_fm.h,v 1.13 2001/01/11 12:03:25 dwmw2 Exp $ + * + * Ported to Linux 2.3.x and MTD: + * Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB + * + */ + +#ifndef __LINUX_JFFS_FM_H__ +#define __LINUX_JFFS_FM_H__ + +#include <linux/types.h> +#include <linux/jffs.h> +#include <linux/mtd/mtd.h> +#include <linux/config.h> + +/* The alignment between two nodes in the flash memory. */ +#define JFFS_ALIGN_SIZE 4 + +/* Mark the on-flash space as obsolete when appropriate. */ +#define JFFS_MARK_OBSOLETE 0 + +#ifndef CONFIG_JFFS_FS_VERBOSE +#define CONFIG_JFFS_FS_VERBOSE 1 +#endif + +#if CONFIG_JFFS_FS_VERBOSE > 0 +#define D(x) x +#define D1(x) D(x) +#else +#define D(x) +#define D1(x) +#endif + +#if CONFIG_JFFS_FS_VERBOSE > 1 +#define D2(x) D(x) +#else +#define D2(x) +#endif + +#if CONFIG_JFFS_FS_VERBOSE > 2 +#define D3(x) D(x) +#else +#define D3(x) +#endif + +#define ASSERT(x) x + +/* How many padding bytes should be inserted between two chunks of data + on the flash? */ +#define JFFS_GET_PAD_BYTES(size) ( (JFFS_ALIGN_SIZE-1) & -(__u32)(size) ) +#define JFFS_PAD(size) ( (size + (JFFS_ALIGN_SIZE-1)) & ~(JFFS_ALIGN_SIZE-1) ) + + + +struct jffs_node_ref +{ + struct jffs_node *node; + struct jffs_node_ref *next; +}; + + +/* The struct jffs_fm represents a chunk of data in the flash memory. */ +struct jffs_fm +{ + __u32 offset; + __u32 size; + struct jffs_fm *prev; + struct jffs_fm *next; + struct jffs_node_ref *nodes; /* USED if != 0. */ +}; + +struct jffs_fmcontrol +{ + __u32 flash_size; + __u32 used_size; + __u32 dirty_size; + __u32 free_size; + __u32 sector_size; + __u32 min_free_size; /* The minimum free space needed to be able + to perform garbage collections. */ + __u32 max_chunk_size; /* The maximum size of a chunk of data. */ + struct mtd_info *mtd; + struct jffs_control *c; + struct jffs_fm *head; + struct jffs_fm *tail; + struct jffs_fm *head_extra; + struct jffs_fm *tail_extra; + struct semaphore biglock; +}; + +/* Notice the two members head_extra and tail_extra in the jffs_control + structure above. Those are only used during the scanning of the flash + memory; while the file system is being built. If the data in the flash + memory is organized like + + +----------------+------------------+----------------+ + | USED / DIRTY | FREE | USED / DIRTY | + +----------------+------------------+----------------+ + + then the scan is split in two parts. The first scanned part of the + flash memory is organized through the members head and tail. The + second scanned part is organized with head_extra and tail_extra. When + the scan is completed, the two lists are merged together. The jffs_fm + struct that head_extra references is the logical beginning of the + flash memory so it will be referenced by the head member. */ + + + +struct jffs_fmcontrol *jffs_build_begin(struct jffs_control *c, int unit); +void jffs_build_end(struct jffs_fmcontrol *fmc); +void jffs_cleanup_fmcontrol(struct jffs_fmcontrol *fmc); + +int jffs_fmalloc(struct jffs_fmcontrol *fmc, __u32 size, + struct jffs_node *node, struct jffs_fm **result); +int jffs_fmfree(struct jffs_fmcontrol *fmc, struct jffs_fm *fm, + struct jffs_node *node); + +__u32 jffs_free_size1(struct jffs_fmcontrol *fmc); +__u32 jffs_free_size2(struct jffs_fmcontrol *fmc); +void jffs_sync_erase(struct jffs_fmcontrol *fmc, int erased_size); +struct jffs_fm *jffs_cut_node(struct jffs_fmcontrol *fmc, __u32 size); +struct jffs_node *jffs_get_oldest_node(struct jffs_fmcontrol *fmc); +long jffs_erasable_size(struct jffs_fmcontrol *fmc); +struct jffs_fm *jffs_fmalloced(struct jffs_fmcontrol *fmc, __u32 offset, + __u32 size, struct jffs_node *node); +int jffs_add_node(struct jffs_node *node); +void jffs_fmfree_partly(struct jffs_fmcontrol *fmc, struct jffs_fm *fm, + __u32 size); + +void jffs_print_fmcontrol(struct jffs_fmcontrol *fmc); +void jffs_print_fm(struct jffs_fm *fm); +#if 0 +void jffs_print_node_ref(struct jffs_node_ref *ref); +#endif /* 0 */ + +#endif /* __LINUX_JFFS_FM_H__ */ |