| 1 |
199 |
simons |
/*
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| 2 |
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* JFFS -- Journalling Flash File System, Linux implementation.
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| 3 |
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*
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| 4 |
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* Copyright (C) 1999, 2000 Finn Hakansson, Axis Communications, Inc.
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| 5 |
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*
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| 6 |
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* This is free software; you can redistribute it and/or modify it
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| 7 |
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* under the terms of the GNU General Public License as published by
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| 8 |
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* the Free Software Foundation; either version 2 of the License, or
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| 9 |
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* (at your option) any later version.
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| 10 |
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*
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| 11 |
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* $Id: intrep.c,v 1.1.1.1 2001-09-10 07:44:39 simons Exp $
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| 12 |
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*
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| 13 |
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*/
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| 14 |
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| 15 |
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/* This file contains the code for the internal structure of the
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| 16 |
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Journalling Flash File System, JFFS. */
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| 17 |
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| 18 |
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/*
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| 19 |
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* Todo list:
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| 20 |
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*
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| 21 |
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* memcpy_to_flash()- and memcpy_from_flash()-functions.
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| 22 |
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*
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| 23 |
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* Implementation of hard links.
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| 24 |
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*
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| 25 |
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* Organize the source code in a better way. Against the VFS we could
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| 26 |
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* have jffs_ext.c, and against the block device jffs_int.c.
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| 27 |
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* A better file-internal organization too.
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| 28 |
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*
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| 29 |
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* A better checksum algorithm.
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| 30 |
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*
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* Consider endianness stuff. ntohl() etc.
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*
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| 33 |
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* Check all comments beginning with XXX.
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| 34 |
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*
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| 35 |
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* Are we handling the atime, mtime, ctime members of the inode right?
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| 36 |
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*
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| 37 |
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* Remove some duplicated code. Take a look at jffs_write_node() and
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| 38 |
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* jffs_rewrite_data() for instance.
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| 39 |
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*
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| 40 |
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* Implement more meaning of the nlink member in various data structures.
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| 41 |
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* nlink could be used in conjunction with hard links for instance.
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| 42 |
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*
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| 43 |
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* Fix the rename stuff. (I.e. if we have two files `a' and `b' and we
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| 44 |
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* do a `mv b a'.) Half of this is already implemented.
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| 45 |
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*
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*/
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#include <linux/module.h>
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| 49 |
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#include <linux/types.h>
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| 50 |
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#include <linux/malloc.h>
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| 51 |
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#include <linux/jffs.h>
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| 52 |
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#include <linux/fs.h>
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| 53 |
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#include <linux/stat.h>
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| 54 |
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#include <linux/pagemap.h>
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| 55 |
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#include <linux/locks.h>
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| 56 |
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#include <asm/byteorder.h>
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| 57 |
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| 58 |
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#include "intrep.h"
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| 59 |
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#include "jffs_fm.h"
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| 60 |
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| 61 |
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#if defined(CONFIG_JFFS_FS_VERBOSE) && CONFIG_JFFS_FS_VERBOSE
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| 62 |
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#define D(x) x
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| 63 |
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#else
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| 64 |
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#define D(x)
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| 65 |
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#endif
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| 66 |
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#define D1(x)
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| 67 |
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#define D2(x)
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| 68 |
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#define D3(x)
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| 69 |
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#define ASSERT(x) x
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| 70 |
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| 71 |
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#if defined(JFFS_MEMORY_DEBUG) && JFFS_MEMORY_DEBUG
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| 72 |
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long no_jffs_file = 0;
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| 73 |
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long no_jffs_node = 0;
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| 74 |
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long no_jffs_control = 0;
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| 75 |
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long no_jffs_raw_inode = 0;
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| 76 |
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long no_jffs_node_ref = 0;
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| 77 |
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long no_jffs_fm = 0;
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| 78 |
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long no_jffs_fmcontrol = 0;
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| 79 |
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long no_hash = 0;
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| 80 |
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long no_name = 0;
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| 81 |
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#endif
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| 82 |
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| 83 |
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static int jffs_scan_flash(struct jffs_control *c);
|
| 84 |
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static int jffs_update_file(struct jffs_file *f, struct jffs_node *node);
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| 85 |
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| 86 |
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#if 0
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| 87 |
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#define _U 01
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| 88 |
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#define _L 02
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| 89 |
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#define _N 04
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| 90 |
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#define _S 010
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| 91 |
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#define _P 020
|
| 92 |
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#define _C 040
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| 93 |
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#define _X 0100
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| 94 |
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#define _B 0200
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| 95 |
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| 96 |
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const unsigned char jffs_ctype_[1 + 256] = {
|
| 97 |
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0,
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| 98 |
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_C, _C, _C, _C, _C, _C, _C, _C,
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| 99 |
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_C, _C|_S, _C|_S, _C|_S, _C|_S, _C|_S, _C, _C,
|
| 100 |
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_C, _C, _C, _C, _C, _C, _C, _C,
|
| 101 |
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_C, _C, _C, _C, _C, _C, _C, _C,
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| 102 |
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_S|_B, _P, _P, _P, _P, _P, _P, _P,
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| 103 |
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_P, _P, _P, _P, _P, _P, _P, _P,
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| 104 |
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_N, _N, _N, _N, _N, _N, _N, _N,
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| 105 |
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_N, _N, _P, _P, _P, _P, _P, _P,
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| 106 |
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_P, _U|_X, _U|_X, _U|_X, _U|_X, _U|_X, _U|_X, _U,
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| 107 |
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_U, _U, _U, _U, _U, _U, _U, _U,
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| 108 |
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_U, _U, _U, _U, _U, _U, _U, _U,
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| 109 |
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_U, _U, _U, _P, _P, _P, _P, _P,
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| 110 |
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_P, _L|_X, _L|_X, _L|_X, _L|_X, _L|_X, _L|_X, _L,
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| 111 |
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_L, _L, _L, _L, _L, _L, _L, _L,
|
| 112 |
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_L, _L, _L, _L, _L, _L, _L, _L,
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| 113 |
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_L, _L, _L, _P, _P, _P, _P, _C
|
| 114 |
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};
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| 115 |
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| 116 |
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#define jffs_isalpha(c) ((jffs_ctype_+1)[c]&(_U|_L))
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| 117 |
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#define jffs_isupper(c) ((jffs_ctype_+1)[c]&_U)
|
| 118 |
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#define jffs_islower(c) ((jffs_ctype_+1)[c]&_L)
|
| 119 |
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#define jffs_isdigit(c) ((jffs_ctype_+1)[c]&_N)
|
| 120 |
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#define jffs_isxdigit(c) ((jffs_ctype_+1)[c]&(_X|_N))
|
| 121 |
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#define jffs_isspace(c) ((jffs_ctype_+1)[c]&_S)
|
| 122 |
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#define jffs_ispunct(c) ((jffs_ctype_+1)[c]&_P)
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| 123 |
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#define jffs_isalnum(c) ((jffs_ctype_+1)[c]&(_U|_L|_N))
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| 124 |
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#define jffs_isprint(c) ((jffs_ctype_+1)[c]&(_P|_U|_L|_N|_B))
|
| 125 |
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#define jffs_isgraph(c) ((jffs_ctype_+1)[c]&(_P|_U|_L|_N))
|
| 126 |
|
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#define jffs_iscntrl(c) ((jffs_ctype_+1)[c]&_C)
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| 127 |
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|
| 128 |
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void
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| 129 |
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jffs_hexdump(const unsigned char* ptr, int size)
|
| 130 |
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{
|
| 131 |
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char line[16];
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| 132 |
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int j = 0;
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| 133 |
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|
| 134 |
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while (size > 0) {
|
| 135 |
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int i;
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| 136 |
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| 137 |
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printk("%p:", ptr);
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| 138 |
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for (j = 0; j < 16; j++) {
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| 139 |
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line[j] = *ptr++;
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| 140 |
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}
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| 141 |
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for (i = 0; i < j; i++) {
|
| 142 |
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if (!(i & 1)) {
|
| 143 |
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printk(" %.2x", line[i] & 0xff);
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| 144 |
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}
|
| 145 |
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else {
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| 146 |
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printk("%.2x", line[i] & 0xff);
|
| 147 |
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}
|
| 148 |
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}
|
| 149 |
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|
| 150 |
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/* Print empty space */
|
| 151 |
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for (; i < 16; i++) {
|
| 152 |
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if (!(i & 1)) {
|
| 153 |
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printk(" ");
|
| 154 |
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}
|
| 155 |
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else {
|
| 156 |
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printk(" ");
|
| 157 |
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}
|
| 158 |
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}
|
| 159 |
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printk(" ");
|
| 160 |
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|
| 161 |
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for (i = 0; i < j; i++) {
|
| 162 |
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if (jffs_isgraph(line[i])) {
|
| 163 |
|
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printk("%c", line[i]);
|
| 164 |
|
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}
|
| 165 |
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else {
|
| 166 |
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printk(".");
|
| 167 |
|
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}
|
| 168 |
|
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}
|
| 169 |
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printk("\n");
|
| 170 |
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size -= 16;
|
| 171 |
|
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}
|
| 172 |
|
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}
|
| 173 |
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#endif
|
| 174 |
|
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|
| 175 |
|
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inline int
|
| 176 |
|
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jffs_min(int a, int b)
|
| 177 |
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{
|
| 178 |
|
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return (a < b ? a : b);
|
| 179 |
|
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}
|
| 180 |
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|
| 181 |
|
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| 182 |
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inline int
|
| 183 |
|
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jffs_max(int a, int b)
|
| 184 |
|
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{
|
| 185 |
|
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return (a > b ? a : b);
|
| 186 |
|
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}
|
| 187 |
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|
|
| 188 |
|
|
|
| 189 |
|
|
/* This routine calculates checksums in JFFS. */
|
| 190 |
|
|
__u32
|
| 191 |
|
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jffs_checksum(const void *data, int size)
|
| 192 |
|
|
{
|
| 193 |
|
|
__u32 sum = 0;
|
| 194 |
|
|
__u8 *ptr = (__u8 *)data;
|
| 195 |
|
|
D3(printk("#csum at 0x%p, {0x%08lx, 0x%08lx, ... }, size: %d",
|
| 196 |
|
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data, *(long *)data, *((long *)data + 1), size));
|
| 197 |
|
|
while (size-- > 0) {
|
| 198 |
|
|
sum += *ptr++;
|
| 199 |
|
|
}
|
| 200 |
|
|
D3(printk(", result: 0x%08x\n", sum));
|
| 201 |
|
|
return sum;
|
| 202 |
|
|
}
|
| 203 |
|
|
|
| 204 |
|
|
|
| 205 |
|
|
/* Create and initialize a new struct jffs_file. */
|
| 206 |
|
|
static struct jffs_file *
|
| 207 |
|
|
jffs_create_file(struct jffs_control *c,
|
| 208 |
|
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const struct jffs_raw_inode *raw_inode)
|
| 209 |
|
|
{
|
| 210 |
|
|
struct jffs_file *f;
|
| 211 |
|
|
|
| 212 |
|
|
if (!(f = (struct jffs_file *)kmalloc(sizeof(struct jffs_file),
|
| 213 |
|
|
GFP_KERNEL))) {
|
| 214 |
|
|
D(printk("jffs_create_file(): Failed!\n"));
|
| 215 |
|
|
return 0;
|
| 216 |
|
|
}
|
| 217 |
|
|
DJM(no_jffs_file++);
|
| 218 |
|
|
memset(f, 0, sizeof(struct jffs_file));
|
| 219 |
|
|
f->ino = raw_inode->ino;
|
| 220 |
|
|
f->pino = raw_inode->pino;
|
| 221 |
|
|
f->nlink = raw_inode->nlink;
|
| 222 |
|
|
f->deleted = raw_inode->deleted;
|
| 223 |
|
|
f->c = c;
|
| 224 |
|
|
|
| 225 |
|
|
return f;
|
| 226 |
|
|
}
|
| 227 |
|
|
|
| 228 |
|
|
|
| 229 |
|
|
/* Build a control block for the file system. */
|
| 230 |
|
|
static struct jffs_control *
|
| 231 |
|
|
jffs_create_control(kdev_t dev)
|
| 232 |
|
|
{
|
| 233 |
|
|
struct jffs_control *c;
|
| 234 |
|
|
register int s = sizeof(struct jffs_control);
|
| 235 |
|
|
D(char *t = 0);
|
| 236 |
|
|
|
| 237 |
|
|
D2(printk("jffs_create_control()\n"));
|
| 238 |
|
|
|
| 239 |
|
|
if (!(c = (struct jffs_control *)kmalloc(s, GFP_KERNEL))) {
|
| 240 |
|
|
goto fail_control;
|
| 241 |
|
|
}
|
| 242 |
|
|
DJM(no_jffs_control++);
|
| 243 |
|
|
c->root = 0;
|
| 244 |
|
|
c->hash_len = JFFS_HASH_SIZE;
|
| 245 |
|
|
s = sizeof(struct jffs_file *) * c->hash_len;
|
| 246 |
|
|
if (!(c->hash = (struct jffs_file **)kmalloc(s, GFP_KERNEL))) {
|
| 247 |
|
|
goto fail_hash;
|
| 248 |
|
|
}
|
| 249 |
|
|
DJM(no_hash++);
|
| 250 |
|
|
memset(c->hash, 0, s);
|
| 251 |
|
|
if (!(c->fmc = jffs_build_begin(c, dev))) {
|
| 252 |
|
|
goto fail_fminit;
|
| 253 |
|
|
}
|
| 254 |
|
|
c->next_ino = JFFS_MIN_INO + 1;
|
| 255 |
|
|
c->rename_lock = 0;
|
| 256 |
|
|
c->rename_wait = (struct wait_queue *)0;
|
| 257 |
|
|
return c;
|
| 258 |
|
|
|
| 259 |
|
|
fail_fminit:
|
| 260 |
|
|
D(t = "c->fmc");
|
| 261 |
|
|
fail_hash:
|
| 262 |
|
|
kfree(c);
|
| 263 |
|
|
DJM(no_jffs_control--);
|
| 264 |
|
|
D(t = t ? t : "c->hash");
|
| 265 |
|
|
fail_control:
|
| 266 |
|
|
D(t = t ? t : "control");
|
| 267 |
|
|
D(printk("jffs_create_control(): Allocation failed: (%s)\n", t));
|
| 268 |
|
|
return (struct jffs_control *)0;
|
| 269 |
|
|
}
|
| 270 |
|
|
|
| 271 |
|
|
|
| 272 |
|
|
/* Clean up all data structures associated with the file system. */
|
| 273 |
|
|
void
|
| 274 |
|
|
jffs_cleanup_control(struct jffs_control *c)
|
| 275 |
|
|
{
|
| 276 |
|
|
D2(printk("jffs_cleanup_control()\n"));
|
| 277 |
|
|
|
| 278 |
|
|
if (!c) {
|
| 279 |
|
|
D(printk("jffs_cleanup_control(): c == NULL !!!\n"));
|
| 280 |
|
|
return;
|
| 281 |
|
|
}
|
| 282 |
|
|
|
| 283 |
|
|
/* Free all files and nodes. */
|
| 284 |
|
|
if (c->hash) {
|
| 285 |
|
|
jffs_foreach_file(c, jffs_free_node_list);
|
| 286 |
|
|
kfree(c->hash);
|
| 287 |
|
|
DJM(no_hash--);
|
| 288 |
|
|
}
|
| 289 |
|
|
jffs_cleanup_fmcontrol(c->fmc);
|
| 290 |
|
|
kfree(c);
|
| 291 |
|
|
DJM(no_jffs_control--);
|
| 292 |
|
|
D3(printk("jffs_cleanup_control(): Leaving...\n"));
|
| 293 |
|
|
}
|
| 294 |
|
|
|
| 295 |
|
|
|
| 296 |
|
|
/* This function adds a virtual root node to the in-RAM representation.
|
| 297 |
|
|
Called by jffs_build_fs(). */
|
| 298 |
|
|
static int
|
| 299 |
|
|
jffs_add_virtual_root(struct jffs_control *c)
|
| 300 |
|
|
{
|
| 301 |
|
|
struct jffs_file *root;
|
| 302 |
|
|
struct jffs_node *node;
|
| 303 |
|
|
|
| 304 |
|
|
D2(printk("jffs_add_virtual_root(): "
|
| 305 |
|
|
"Creating a virtual root directory.\n"));
|
| 306 |
|
|
|
| 307 |
|
|
if (!(root = (struct jffs_file *)kmalloc(sizeof(struct jffs_file),
|
| 308 |
|
|
GFP_KERNEL))) {
|
| 309 |
|
|
return -ENOMEM;
|
| 310 |
|
|
}
|
| 311 |
|
|
DJM(no_jffs_file++);
|
| 312 |
|
|
if (!(node = (struct jffs_node *)kmalloc(sizeof(struct jffs_node),
|
| 313 |
|
|
GFP_KERNEL))) {
|
| 314 |
|
|
kfree(root);
|
| 315 |
|
|
DJM(no_jffs_file--);
|
| 316 |
|
|
return -ENOMEM;
|
| 317 |
|
|
}
|
| 318 |
|
|
DJM(no_jffs_node++);
|
| 319 |
|
|
memset(node, 0, sizeof(struct jffs_node));
|
| 320 |
|
|
node->ino = JFFS_MIN_INO;
|
| 321 |
|
|
memset(root, 0, sizeof(struct jffs_file));
|
| 322 |
|
|
root->ino = JFFS_MIN_INO;
|
| 323 |
|
|
root->mode = S_IFDIR | S_IRWXU | S_IRGRP
|
| 324 |
|
|
| S_IXGRP | S_IROTH | S_IXOTH;
|
| 325 |
|
|
root->atime = root->mtime = root->ctime = CURRENT_TIME;
|
| 326 |
|
|
root->nlink = 1;
|
| 327 |
|
|
root->c = c;
|
| 328 |
|
|
root->version_head = root->version_tail = node;
|
| 329 |
|
|
jffs_insert_file_into_hash(root);
|
| 330 |
|
|
return 0;
|
| 331 |
|
|
}
|
| 332 |
|
|
|
| 333 |
|
|
|
| 334 |
|
|
/* This is where the file system is built and initialized. */
|
| 335 |
|
|
int
|
| 336 |
|
|
jffs_build_fs(struct super_block *sb)
|
| 337 |
|
|
{
|
| 338 |
|
|
struct jffs_control *c;
|
| 339 |
|
|
int err = 0;
|
| 340 |
|
|
|
| 341 |
|
|
D2(printk("jffs_build_fs()\n"));
|
| 342 |
|
|
|
| 343 |
|
|
if (!(c = jffs_create_control(sb->s_dev))) {
|
| 344 |
|
|
return -ENOMEM;
|
| 345 |
|
|
}
|
| 346 |
|
|
c->building_fs = 1;
|
| 347 |
|
|
c->sb = sb;
|
| 348 |
|
|
if ((err = jffs_scan_flash(c)) < 0) {
|
| 349 |
|
|
goto jffs_build_fs_fail;
|
| 350 |
|
|
}
|
| 351 |
|
|
|
| 352 |
|
|
/* Add a virtual root node if no one exists. */
|
| 353 |
|
|
if (!jffs_find_file(c, JFFS_MIN_INO)) {
|
| 354 |
|
|
if ((err = jffs_add_virtual_root(c)) < 0) {
|
| 355 |
|
|
goto jffs_build_fs_fail;
|
| 356 |
|
|
}
|
| 357 |
|
|
}
|
| 358 |
|
|
|
| 359 |
|
|
/* Remove deleted nodes. */
|
| 360 |
|
|
if ((err = jffs_foreach_file(c, jffs_possibly_delete_file)) < 0) {
|
| 361 |
|
|
printk(KERN_ERR "JFFS: Failed to remove deleted nodes.\n");
|
| 362 |
|
|
goto jffs_build_fs_fail;
|
| 363 |
|
|
}
|
| 364 |
|
|
/* Remove redundant nodes. (We are not interested in the
|
| 365 |
|
|
return value in this case.) */
|
| 366 |
|
|
jffs_foreach_file(c, jffs_remove_redundant_nodes);
|
| 367 |
|
|
/* Try to build a tree from all the nodes. */
|
| 368 |
|
|
if ((err = jffs_foreach_file(c, jffs_insert_file_into_tree)) < 0) {
|
| 369 |
|
|
printk("JFFS: Failed to build tree.\n");
|
| 370 |
|
|
goto jffs_build_fs_fail;
|
| 371 |
|
|
}
|
| 372 |
|
|
/* Compute the sizes of all files in the filesystem. Adjust if
|
| 373 |
|
|
necessary. */
|
| 374 |
|
|
if ((err = jffs_foreach_file(c, jffs_build_file)) < 0) {
|
| 375 |
|
|
printk("JFFS: Failed to build file system.\n");
|
| 376 |
|
|
goto jffs_build_fs_fail;
|
| 377 |
|
|
}
|
| 378 |
|
|
sb->u.generic_sbp = (void *)c;
|
| 379 |
|
|
c->building_fs = 0;
|
| 380 |
|
|
|
| 381 |
|
|
D1(jffs_print_hash_table(c));
|
| 382 |
|
|
D1(jffs_print_tree(c->root, 0));
|
| 383 |
|
|
|
| 384 |
|
|
return 0;
|
| 385 |
|
|
|
| 386 |
|
|
jffs_build_fs_fail:
|
| 387 |
|
|
jffs_cleanup_control(c);
|
| 388 |
|
|
return err;
|
| 389 |
|
|
} /* jffs_build_fs() */
|
| 390 |
|
|
|
| 391 |
|
|
|
| 392 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 393 |
|
|
|
| 394 |
|
|
/* Scan the whole flash memory in order to find all nodes in the
|
| 395 |
|
|
file systems. */
|
| 396 |
|
|
static int
|
| 397 |
|
|
jffs_scan_flash(struct jffs_control *c)
|
| 398 |
|
|
{
|
| 399 |
|
|
char name[JFFS_MAX_NAME_LEN + 2];
|
| 400 |
|
|
struct jffs_raw_inode raw_inode;
|
| 401 |
|
|
struct jffs_node *node = 0;
|
| 402 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 403 |
|
|
__u32 checksum;
|
| 404 |
|
|
__u8 tmp_accurate;
|
| 405 |
|
|
__u16 tmp_chksum;
|
| 406 |
|
|
unsigned char *pos = (unsigned char *) fmc->flash_start;
|
| 407 |
|
|
unsigned char *start;
|
| 408 |
|
|
unsigned char *end = (unsigned char *)
|
| 409 |
|
|
(fmc->flash_start + fmc->flash_size);
|
| 410 |
|
|
|
| 411 |
|
|
D1(printk("jffs_scan_flash(): start pos = 0x%p, end = 0x%p\n",
|
| 412 |
|
|
pos, end));
|
| 413 |
|
|
|
| 414 |
|
|
flash_safe_acquire(fmc->flash_part);
|
| 415 |
|
|
|
| 416 |
|
|
/* Start the scan. */
|
| 417 |
|
|
while (pos < end) {
|
| 418 |
|
|
|
| 419 |
|
|
/* Remember the position from where we started this scan. */
|
| 420 |
|
|
start = pos;
|
| 421 |
|
|
|
| 422 |
|
|
switch (*(__u32 *)pos) {
|
| 423 |
|
|
case JFFS_EMPTY_BITMASK:
|
| 424 |
|
|
/* We have found 0xff on this block. We have to
|
| 425 |
|
|
scan the rest of the block to be sure it is
|
| 426 |
|
|
filled with 0xff. */
|
| 427 |
|
|
D1(printk("jffs_scan_flash(): 0xff at pos 0x%p.\n",
|
| 428 |
|
|
pos));
|
| 429 |
|
|
for (; pos < end
|
| 430 |
|
|
&& JFFS_EMPTY_BITMASK == *(__u32 *)pos;
|
| 431 |
|
|
pos += 4);
|
| 432 |
|
|
D1(printk("jffs_scan_flash(): 0xff ended at "
|
| 433 |
|
|
"pos 0x%p.\n", pos));
|
| 434 |
|
|
continue;
|
| 435 |
|
|
|
| 436 |
|
|
case JFFS_DIRTY_BITMASK:
|
| 437 |
|
|
/* We have found 0x00 on this block. We have to
|
| 438 |
|
|
scan as far as possible to find out how much
|
| 439 |
|
|
is dirty. */
|
| 440 |
|
|
D1(printk("jffs_scan_flash(): 0x00 at pos 0x%p.\n",
|
| 441 |
|
|
pos));
|
| 442 |
|
|
for (; pos < end
|
| 443 |
|
|
&& JFFS_DIRTY_BITMASK == *(__u32 *)pos;
|
| 444 |
|
|
pos += 4);
|
| 445 |
|
|
D1(printk("jffs_scan_flash(): 0x00 ended at "
|
| 446 |
|
|
"pos 0x%p.\n", pos));
|
| 447 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 448 |
|
|
(__u32) (pos - start), 0);
|
| 449 |
|
|
continue;
|
| 450 |
|
|
|
| 451 |
|
|
case JFFS_MAGIC_BITMASK:
|
| 452 |
|
|
/* We have probably found a new raw inode. */
|
| 453 |
|
|
break;
|
| 454 |
|
|
|
| 455 |
|
|
default:
|
| 456 |
|
|
bad_inode:
|
| 457 |
|
|
/* We're f*cked. This is not solved yet. We have
|
| 458 |
|
|
to scan for the magic pattern. */
|
| 459 |
|
|
D1(printk("*************** Dirty flash memory or bad inode: "
|
| 460 |
|
|
"hexdump(pos = 0x%p, len = 128):\n",
|
| 461 |
|
|
pos));
|
| 462 |
|
|
D1(jffs_hexdump(pos, 128));
|
| 463 |
|
|
for (pos += 4; pos < end; pos += 4) {
|
| 464 |
|
|
switch (*(__u32 *)pos) {
|
| 465 |
|
|
case JFFS_MAGIC_BITMASK:
|
| 466 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 467 |
|
|
(__u32) (pos - start),
|
| 468 |
|
|
0);
|
| 469 |
|
|
goto cont_scan;
|
| 470 |
|
|
default:
|
| 471 |
|
|
break;
|
| 472 |
|
|
}
|
| 473 |
|
|
}
|
| 474 |
|
|
cont_scan:
|
| 475 |
|
|
continue;
|
| 476 |
|
|
}
|
| 477 |
|
|
|
| 478 |
|
|
/* We have found the beginning of an inode. Create a
|
| 479 |
|
|
node for it. */
|
| 480 |
|
|
if (!node) {
|
| 481 |
|
|
if (!(node = (struct jffs_node *)
|
| 482 |
|
|
kmalloc(sizeof(struct jffs_node),
|
| 483 |
|
|
GFP_KERNEL))) {
|
| 484 |
|
|
flash_safe_release(fmc->flash_part);
|
| 485 |
|
|
return -ENOMEM;
|
| 486 |
|
|
}
|
| 487 |
|
|
DJM(no_jffs_node++);
|
| 488 |
|
|
}
|
| 489 |
|
|
|
| 490 |
|
|
/* Read the next raw inode. */
|
| 491 |
|
|
memcpy(&raw_inode, pos, sizeof(struct jffs_raw_inode));
|
| 492 |
|
|
|
| 493 |
|
|
/* When we compute the checksum for the inode, we never
|
| 494 |
|
|
count the 'accurate' or the 'checksum' fields. */
|
| 495 |
|
|
tmp_accurate = raw_inode.accurate;
|
| 496 |
|
|
tmp_chksum = raw_inode.chksum;
|
| 497 |
|
|
raw_inode.accurate = 0;
|
| 498 |
|
|
raw_inode.chksum = 0;
|
| 499 |
|
|
checksum = jffs_checksum(&raw_inode,
|
| 500 |
|
|
sizeof(struct jffs_raw_inode));
|
| 501 |
|
|
raw_inode.accurate = tmp_accurate;
|
| 502 |
|
|
raw_inode.chksum = tmp_chksum;
|
| 503 |
|
|
|
| 504 |
|
|
D3(printk("*** We have found this raw inode at pos 0x%p "
|
| 505 |
|
|
"on the flash:\n", pos));
|
| 506 |
|
|
D3(jffs_print_raw_inode(&raw_inode));
|
| 507 |
|
|
|
| 508 |
|
|
if (checksum != raw_inode.chksum) {
|
| 509 |
|
|
D1(printk("jffs_scan_flash(): Bad checksum: "
|
| 510 |
|
|
"checksum = %u, "
|
| 511 |
|
|
"raw_inode.chksum = %u\n",
|
| 512 |
|
|
checksum, raw_inode.chksum));
|
| 513 |
|
|
pos += sizeof(struct jffs_raw_inode);
|
| 514 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 515 |
|
|
(__u32) (pos - start), 0);
|
| 516 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 517 |
|
|
continue;
|
| 518 |
|
|
}
|
| 519 |
|
|
|
| 520 |
|
|
/* Check the raw inode read so far. Start with the
|
| 521 |
|
|
maximum length of the filename. */
|
| 522 |
|
|
if (raw_inode.nsize > JFFS_MAX_NAME_LEN) {
|
| 523 |
|
|
goto bad_inode;
|
| 524 |
|
|
}
|
| 525 |
|
|
/* The node's data segment should not exceed a
|
| 526 |
|
|
certain length. */
|
| 527 |
|
|
if (raw_inode.dsize > fmc->max_chunk_size) {
|
| 528 |
|
|
goto bad_inode;
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
pos += sizeof(struct jffs_raw_inode);
|
| 532 |
|
|
|
| 533 |
|
|
/* This shouldn't be necessary because a node that
|
| 534 |
|
|
violates the flash boundaries shouldn't be written
|
| 535 |
|
|
in the first place. */
|
| 536 |
|
|
if (pos >= end) {
|
| 537 |
|
|
goto check_node;
|
| 538 |
|
|
}
|
| 539 |
|
|
|
| 540 |
|
|
/* Read the name. */
|
| 541 |
|
|
*name = 0;
|
| 542 |
|
|
if (raw_inode.nsize) {
|
| 543 |
|
|
memcpy(name, pos, raw_inode.nsize);
|
| 544 |
|
|
name[raw_inode.nsize] = '\0';
|
| 545 |
|
|
pos += raw_inode.nsize
|
| 546 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode.nsize);
|
| 547 |
|
|
D3(printk("name == \"%s\"\n", name));
|
| 548 |
|
|
checksum = jffs_checksum(name, raw_inode.nsize);
|
| 549 |
|
|
if (checksum != raw_inode.nchksum) {
|
| 550 |
|
|
D1(printk("jffs_scan_flash(): Bad checksum: "
|
| 551 |
|
|
"checksum = %u, "
|
| 552 |
|
|
"raw_inode.nchksum = %u\n",
|
| 553 |
|
|
checksum, raw_inode.nchksum));
|
| 554 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 555 |
|
|
(__u32) (pos - start), 0);
|
| 556 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 557 |
|
|
continue;
|
| 558 |
|
|
}
|
| 559 |
|
|
if (pos >= end) {
|
| 560 |
|
|
goto check_node;
|
| 561 |
|
|
}
|
| 562 |
|
|
}
|
| 563 |
|
|
|
| 564 |
|
|
/* Read the data in order to be sure it matches the
|
| 565 |
|
|
checksum. */
|
| 566 |
|
|
checksum = jffs_checksum(pos, raw_inode.dsize);
|
| 567 |
|
|
pos += raw_inode.dsize + JFFS_GET_PAD_BYTES(raw_inode.dsize);
|
| 568 |
|
|
|
| 569 |
|
|
if (checksum != raw_inode.dchksum) {
|
| 570 |
|
|
D1(printk("jffs_scan_flash(): Bad checksum: "
|
| 571 |
|
|
"checksum = %u, "
|
| 572 |
|
|
"raw_inode.dchksum = %u\n",
|
| 573 |
|
|
checksum, raw_inode.dchksum));
|
| 574 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 575 |
|
|
(__u32) (pos - start), 0);
|
| 576 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 577 |
|
|
continue;
|
| 578 |
|
|
}
|
| 579 |
|
|
|
| 580 |
|
|
check_node:
|
| 581 |
|
|
|
| 582 |
|
|
/* Remember the highest inode number in the whole file
|
| 583 |
|
|
system. This information will be used when assigning
|
| 584 |
|
|
new files new inode numbers. */
|
| 585 |
|
|
if (c->next_ino <= raw_inode.ino) {
|
| 586 |
|
|
c->next_ino = raw_inode.ino + 1;
|
| 587 |
|
|
}
|
| 588 |
|
|
|
| 589 |
|
|
if (raw_inode.accurate) {
|
| 590 |
|
|
int err;
|
| 591 |
|
|
node->data_offset = raw_inode.offset;
|
| 592 |
|
|
node->data_size = raw_inode.dsize;
|
| 593 |
|
|
node->removed_size = raw_inode.rsize;
|
| 594 |
|
|
/* Compute the offset to the actual data in the
|
| 595 |
|
|
on-flash node. */
|
| 596 |
|
|
node->fm_offset
|
| 597 |
|
|
= sizeof(struct jffs_raw_inode)
|
| 598 |
|
|
+ raw_inode.nsize
|
| 599 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode.nsize);
|
| 600 |
|
|
node->fm = jffs_fmalloced(fmc, (__u32) start,
|
| 601 |
|
|
(__u32) (pos - start),
|
| 602 |
|
|
node);
|
| 603 |
|
|
if (!node->fm) {
|
| 604 |
|
|
D(printk("jffs_scan_flash(): !node->fm\n"));
|
| 605 |
|
|
kfree(node);
|
| 606 |
|
|
DJM(no_jffs_node--);
|
| 607 |
|
|
flash_safe_release(fmc->flash_part);
|
| 608 |
|
|
return -ENOMEM;
|
| 609 |
|
|
}
|
| 610 |
|
|
if ((err = jffs_insert_node(c, 0, &raw_inode,
|
| 611 |
|
|
name, node)) < 0) {
|
| 612 |
|
|
printk("JFFS: Failed to handle raw inode. "
|
| 613 |
|
|
"(err = %d)\n", err);
|
| 614 |
|
|
break;
|
| 615 |
|
|
}
|
| 616 |
|
|
D3(jffs_print_node(node));
|
| 617 |
|
|
node = 0; /* Don't free the node! */
|
| 618 |
|
|
}
|
| 619 |
|
|
else {
|
| 620 |
|
|
jffs_fmalloced(fmc, (__u32) start,
|
| 621 |
|
|
(__u32) (pos - start), 0);
|
| 622 |
|
|
D3(printk("jffs_scan_flash(): Just found an obsolete "
|
| 623 |
|
|
"raw_inode. Continuing the scan...\n"));
|
| 624 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 625 |
|
|
}
|
| 626 |
|
|
}
|
| 627 |
|
|
|
| 628 |
|
|
if (node) {
|
| 629 |
|
|
kfree(node);
|
| 630 |
|
|
DJM(no_jffs_node--);
|
| 631 |
|
|
}
|
| 632 |
|
|
jffs_build_end(fmc);
|
| 633 |
|
|
D3(printk("jffs_scan_flash(): Leaving...\n"));
|
| 634 |
|
|
flash_safe_release(fmc->flash_part);
|
| 635 |
|
|
return 0;
|
| 636 |
|
|
} /* jffs_scan_flash() */
|
| 637 |
|
|
|
| 638 |
|
|
#else
|
| 639 |
|
|
|
| 640 |
|
|
/* Scan the whole flash memory in order to find all nodes in the
|
| 641 |
|
|
file systems. */
|
| 642 |
|
|
int
|
| 643 |
|
|
jffs_scan_flash(struct jffs_control *c)
|
| 644 |
|
|
{
|
| 645 |
|
|
char name[JFFS_MAX_NAME_LEN + 2];
|
| 646 |
|
|
struct jffs_raw_inode raw_inode;
|
| 647 |
|
|
struct jffs_node *node = 0;
|
| 648 |
|
|
struct buffer_head *bh;
|
| 649 |
|
|
kdev_t dev = c->sb->s_dev;
|
| 650 |
|
|
__u32 block = 0;
|
| 651 |
|
|
__u32 last_block = c->fmc->flash_size / BLOCK_SIZE - 1;
|
| 652 |
|
|
__u32 block_offset = 0;
|
| 653 |
|
|
__u32 read_size;
|
| 654 |
|
|
__u32 checksum;
|
| 655 |
|
|
__u32 offset; /* Offset relative to the start of the flash memory. */
|
| 656 |
|
|
__u8 tmp_accurate;
|
| 657 |
|
|
__u32 tmp_chksum;
|
| 658 |
|
|
__u32 size;
|
| 659 |
|
|
|
| 660 |
|
|
D(printk("jffs_scan_flash()\n"));
|
| 661 |
|
|
|
| 662 |
|
|
if (!(bh = bread(dev, block, BLOCK_SIZE))) {
|
| 663 |
|
|
D(printk("jffs_scan_flash(): First bread() failed.\n"));
|
| 664 |
|
|
return -1;
|
| 665 |
|
|
}
|
| 666 |
|
|
|
| 667 |
|
|
/* Start the scan. */
|
| 668 |
|
|
while (block <= last_block) {
|
| 669 |
|
|
if (block_offset >= BLOCK_SIZE) {
|
| 670 |
|
|
brelse(bh);
|
| 671 |
|
|
if (block == last_block) {
|
| 672 |
|
|
bh = 0;
|
| 673 |
|
|
goto end_of_scan;
|
| 674 |
|
|
}
|
| 675 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 676 |
|
|
return -1;
|
| 677 |
|
|
}
|
| 678 |
|
|
block_offset = 0;
|
| 679 |
|
|
}
|
| 680 |
|
|
offset = block * BLOCK_SIZE + block_offset;
|
| 681 |
|
|
D(printk("jffs_scan_flash(): offset = %u\n", offset));
|
| 682 |
|
|
|
| 683 |
|
|
switch (*(__u32 *)&bh->b_data[block_offset]) {
|
| 684 |
|
|
case JFFS_EMPTY_BITMASK:
|
| 685 |
|
|
/* We have found 0xff on this block. We have to
|
| 686 |
|
|
scan the rest of the block to be sure it is
|
| 687 |
|
|
filled with 0xff. */
|
| 688 |
|
|
D(printk("jffs_scan_flash(): 0xff on block %u, "
|
| 689 |
|
|
"block_offset %u.\n", block, block_offset));
|
| 690 |
|
|
block_offset += 4;
|
| 691 |
|
|
while (block <= last_block) {
|
| 692 |
|
|
for (; block_offset < BLOCK_SIZE;
|
| 693 |
|
|
block_offset += 4) {
|
| 694 |
|
|
if (JFFS_EMPTY_BITMASK
|
| 695 |
|
|
!= *(__u32 *)&bh->b_data[block_offset]) {
|
| 696 |
|
|
goto ff_scan_end;
|
| 697 |
|
|
}
|
| 698 |
|
|
}
|
| 699 |
|
|
brelse(bh);
|
| 700 |
|
|
block_offset = 0;
|
| 701 |
|
|
if (block >= last_block) {
|
| 702 |
|
|
bh = 0;
|
| 703 |
|
|
D(printk("jffs_scan_flash(): "
|
| 704 |
|
|
"0xff size: %d\n",
|
| 705 |
|
|
(last_block + 1) * BLOCK_SIZE
|
| 706 |
|
|
- offset));
|
| 707 |
|
|
goto end_of_scan;
|
| 708 |
|
|
}
|
| 709 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 710 |
|
|
return -1;
|
| 711 |
|
|
}
|
| 712 |
|
|
}
|
| 713 |
|
|
ff_scan_end:
|
| 714 |
|
|
D(printk("jffs_scan_flash(): 0xff size: %d\n",
|
| 715 |
|
|
block * BLOCK_SIZE + block_offset - offset));
|
| 716 |
|
|
continue;
|
| 717 |
|
|
case JFFS_DIRTY_BITMASK:
|
| 718 |
|
|
/* We have found 0x00 on this block. We have to
|
| 719 |
|
|
scan as far as possible to find out how much
|
| 720 |
|
|
is dirty. */
|
| 721 |
|
|
D(printk("jffs_scan_flash(): 0x00 on block %u, "
|
| 722 |
|
|
"block_offset %u.\n",
|
| 723 |
|
|
block, block_offset));
|
| 724 |
|
|
block_offset += 4;
|
| 725 |
|
|
while (block < last_block) {
|
| 726 |
|
|
for (; block_offset < BLOCK_SIZE;
|
| 727 |
|
|
block_offset += 4) {
|
| 728 |
|
|
if (*(__u32 *)&bh->b_data[block_offset]
|
| 729 |
|
|
!= JFFS_DIRTY_BITMASK) {
|
| 730 |
|
|
goto zero_scan_end;
|
| 731 |
|
|
}
|
| 732 |
|
|
}
|
| 733 |
|
|
brelse(bh);
|
| 734 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 735 |
|
|
return -1;
|
| 736 |
|
|
}
|
| 737 |
|
|
block_offset = 0;
|
| 738 |
|
|
}
|
| 739 |
|
|
zero_scan_end:
|
| 740 |
|
|
D(printk("jffs_scan_flash(): 0x00 size: %d\n",
|
| 741 |
|
|
block * BLOCK_SIZE + block_offset - offset));
|
| 742 |
|
|
jffs_fmalloced(c->fmc, offset,
|
| 743 |
|
|
block * BLOCK_SIZE + block_offset
|
| 744 |
|
|
- offset, 0);
|
| 745 |
|
|
continue;
|
| 746 |
|
|
case JFFS_MAGIC_BITMASK:
|
| 747 |
|
|
/* We have probably found a new raw inode. */
|
| 748 |
|
|
break;
|
| 749 |
|
|
default:
|
| 750 |
|
|
/* We're f*cked. This is not solved yet. We have
|
| 751 |
|
|
to scan for the magic pattern. */
|
| 752 |
|
|
D(printk("jffs_scan_flash(): Block #%u at "
|
| 753 |
|
|
"block_offset %u is dirty!\n",
|
| 754 |
|
|
block, block_offset));
|
| 755 |
|
|
D(printk(" offset: %u\n", offset));
|
| 756 |
|
|
D(printk(" data: %u\n",
|
| 757 |
|
|
*(__u32 *)&bh->b_data[block_offset]));
|
| 758 |
|
|
jffs_fmalloced(c->fmc, offset,
|
| 759 |
|
|
BLOCK_SIZE - block_offset, 0);
|
| 760 |
|
|
block_offset = BLOCK_SIZE;
|
| 761 |
|
|
continue;
|
| 762 |
|
|
}
|
| 763 |
|
|
|
| 764 |
|
|
/* We have found the beginning of an inode. Create a
|
| 765 |
|
|
node for it. */
|
| 766 |
|
|
if (!node) {
|
| 767 |
|
|
if (!(node = (struct jffs_node *)
|
| 768 |
|
|
kmalloc(sizeof(struct jffs_node),
|
| 769 |
|
|
GFP_KERNEL))) {
|
| 770 |
|
|
brelse(bh);
|
| 771 |
|
|
return -ENOMEM;
|
| 772 |
|
|
}
|
| 773 |
|
|
DJM(no_jffs_node++);
|
| 774 |
|
|
}
|
| 775 |
|
|
|
| 776 |
|
|
/* Read the next raw inode. */
|
| 777 |
|
|
read_size = jffs_min(BLOCK_SIZE - block_offset,
|
| 778 |
|
|
sizeof(struct jffs_raw_inode));
|
| 779 |
|
|
memcpy(&raw_inode, &bh->b_data[block_offset], read_size);
|
| 780 |
|
|
D(printk("jffs_scan_flash(): block_offset: %u, "
|
| 781 |
|
|
"read_size: %u\n", block_offset, read_size));
|
| 782 |
|
|
block_offset += read_size;
|
| 783 |
|
|
if (read_size < sizeof(struct jffs_raw_inode)) {
|
| 784 |
|
|
brelse(bh);
|
| 785 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 786 |
|
|
return -1;
|
| 787 |
|
|
}
|
| 788 |
|
|
block_offset = sizeof(struct jffs_raw_inode) - read_size;
|
| 789 |
|
|
memcpy((void *)&raw_inode + read_size, bh->b_data,
|
| 790 |
|
|
block_offset);
|
| 791 |
|
|
}
|
| 792 |
|
|
/* When we compute the checksum for the inode, we never count
|
| 793 |
|
|
the 'accurate' or the 'checksum' fields. */
|
| 794 |
|
|
tmp_accurate = raw_inode.accurate;
|
| 795 |
|
|
tmp_chksum = raw_inode.chksum;
|
| 796 |
|
|
raw_inode.accurate = 0;
|
| 797 |
|
|
raw_inode.chksum = 0;
|
| 798 |
|
|
checksum = jffs_checksum(&raw_inode,
|
| 799 |
|
|
sizeof(struct jffs_raw_inode));
|
| 800 |
|
|
raw_inode.accurate = tmp_accurate;
|
| 801 |
|
|
raw_inode.chksum = tmp_chksum;
|
| 802 |
|
|
|
| 803 |
|
|
D(printk("*** We have found this raw inode at pos 0x%08x "
|
| 804 |
|
|
"on the flash:\n", offset));
|
| 805 |
|
|
jffs_print_raw_inode(&raw_inode);
|
| 806 |
|
|
|
| 807 |
|
|
if (block_offset == BLOCK_SIZE) {
|
| 808 |
|
|
brelse(bh);
|
| 809 |
|
|
if (block == last_block) {
|
| 810 |
|
|
bh = 0;
|
| 811 |
|
|
goto check_node;
|
| 812 |
|
|
}
|
| 813 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 814 |
|
|
return -1;
|
| 815 |
|
|
}
|
| 816 |
|
|
block_offset = 0;
|
| 817 |
|
|
}
|
| 818 |
|
|
|
| 819 |
|
|
/* Read the name. */
|
| 820 |
|
|
*name = 0;
|
| 821 |
|
|
if (raw_inode.nsize) {
|
| 822 |
|
|
read_size = jffs_min(BLOCK_SIZE - block_offset,
|
| 823 |
|
|
raw_inode.nsize);
|
| 824 |
|
|
memcpy(name, &bh->b_data[block_offset], read_size);
|
| 825 |
|
|
block_offset += read_size;
|
| 826 |
|
|
if (read_size < raw_inode.nsize) {
|
| 827 |
|
|
/* We haven't read the whole name. */
|
| 828 |
|
|
brelse(bh);
|
| 829 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 830 |
|
|
return -1;
|
| 831 |
|
|
}
|
| 832 |
|
|
block_offset = raw_inode.nsize - read_size;
|
| 833 |
|
|
memcpy(&name[read_size], bh->b_data, block_offset);
|
| 834 |
|
|
}
|
| 835 |
|
|
block_offset += JFFS_GET_PAD_BYTES(block_offset);
|
| 836 |
|
|
name[raw_inode.nsize] = '\0';
|
| 837 |
|
|
checksum += jffs_checksum(name, raw_inode.nsize);
|
| 838 |
|
|
}
|
| 839 |
|
|
|
| 840 |
|
|
if (block_offset == BLOCK_SIZE) {
|
| 841 |
|
|
brelse(bh);
|
| 842 |
|
|
if (block == last_block) {
|
| 843 |
|
|
bh = 0;
|
| 844 |
|
|
goto check_node;
|
| 845 |
|
|
}
|
| 846 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 847 |
|
|
return -1;
|
| 848 |
|
|
}
|
| 849 |
|
|
block_offset = 0;
|
| 850 |
|
|
}
|
| 851 |
|
|
|
| 852 |
|
|
/* Read the data in order to be sure it matches the
|
| 853 |
|
|
checksum. */
|
| 854 |
|
|
if (raw_inode.dsize) {
|
| 855 |
|
|
__u32 chunk_size = jffs_min(BLOCK_SIZE - block_offset,
|
| 856 |
|
|
raw_inode.dsize);
|
| 857 |
|
|
__u32 data_read = chunk_size;
|
| 858 |
|
|
checksum += jffs_checksum(&bh->b_data[block_offset],
|
| 859 |
|
|
data_read);
|
| 860 |
|
|
block_offset += chunk_size;
|
| 861 |
|
|
while (data_read < raw_inode.dsize) {
|
| 862 |
|
|
brelse(bh);
|
| 863 |
|
|
if (!(bh = bread(dev, ++block, BLOCK_SIZE))) {
|
| 864 |
|
|
return -1;
|
| 865 |
|
|
}
|
| 866 |
|
|
chunk_size = jffs_min(BLOCK_SIZE,
|
| 867 |
|
|
raw_inode.dsize
|
| 868 |
|
|
- data_read);
|
| 869 |
|
|
data_read += chunk_size;
|
| 870 |
|
|
checksum += jffs_checksum(bh->b_data,
|
| 871 |
|
|
chunk_size);
|
| 872 |
|
|
block_offset = chunk_size;
|
| 873 |
|
|
}
|
| 874 |
|
|
}
|
| 875 |
|
|
size = sizeof(struct jffs_raw_inode) + raw_inode.nsize
|
| 876 |
|
|
+ raw_inode.dsize;
|
| 877 |
|
|
|
| 878 |
|
|
block_offset += JFFS_GET_PAD_BYTES(block_offset);
|
| 879 |
|
|
|
| 880 |
|
|
/* Make sure the checksums are equal. */
|
| 881 |
|
|
if (checksum != raw_inode.chksum) {
|
| 882 |
|
|
/* Something was wrong with the node. The node
|
| 883 |
|
|
has to be discarded. */
|
| 884 |
|
|
D(printk("jffs_scan_flash(): checksum == %u, "
|
| 885 |
|
|
"raw_inode.chksum == %u\n",
|
| 886 |
|
|
checksum, raw_inode.chksum));
|
| 887 |
|
|
jffs_fmalloced(c->fmc, offset, size, 0);
|
| 888 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 889 |
|
|
continue;
|
| 890 |
|
|
}
|
| 891 |
|
|
|
| 892 |
|
|
/* Remember the highest inode number in the whole file
|
| 893 |
|
|
system. This information will be used when assigning
|
| 894 |
|
|
new files new inode numbers. */
|
| 895 |
|
|
if (c->next_ino <= raw_inode.ino) {
|
| 896 |
|
|
c->next_ino = raw_inode.ino + 1;
|
| 897 |
|
|
}
|
| 898 |
|
|
|
| 899 |
|
|
check_node:
|
| 900 |
|
|
if (raw_inode.accurate) {
|
| 901 |
|
|
node->data_offset = raw_inode.offset;
|
| 902 |
|
|
node->data_size = raw_inode.dsize;
|
| 903 |
|
|
node->removed_size = raw_inode.rsize;
|
| 904 |
|
|
node->fm_offset = sizeof(struct jffs_raw_inode)
|
| 905 |
|
|
+ raw_inode.nsize
|
| 906 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode.nsize);
|
| 907 |
|
|
node->fm = jffs_fmalloced(c->fmc, offset, size, node);
|
| 908 |
|
|
if (!node->fm) {
|
| 909 |
|
|
D(printk("jffs_scan_flash(): !node->fm\n"));
|
| 910 |
|
|
kfree(node);
|
| 911 |
|
|
DJM(no_jffs_node--);
|
| 912 |
|
|
brelse(bh);
|
| 913 |
|
|
return -ENOMEM;
|
| 914 |
|
|
}
|
| 915 |
|
|
jffs_insert_node(c, 0, &raw_inode, name, node);
|
| 916 |
|
|
jffs_print_node(node);
|
| 917 |
|
|
node = 0; /* Don't free the node! */
|
| 918 |
|
|
}
|
| 919 |
|
|
else {
|
| 920 |
|
|
jffs_fmalloced(c->fmc, offset, size, 0);
|
| 921 |
|
|
D(printk("jffs_scan_flash(): Just found an obsolete "
|
| 922 |
|
|
"raw_inode. Continuing the scan...\n"));
|
| 923 |
|
|
/* Reuse this unused struct jffs_node. */
|
| 924 |
|
|
}
|
| 925 |
|
|
}
|
| 926 |
|
|
|
| 927 |
|
|
end_of_scan:
|
| 928 |
|
|
brelse(bh);
|
| 929 |
|
|
if (node) {
|
| 930 |
|
|
kfree(node);
|
| 931 |
|
|
DJM(no_jffs_node--);
|
| 932 |
|
|
}
|
| 933 |
|
|
jffs_build_end(c->fmc);
|
| 934 |
|
|
D(printk("jffs_scan_flash(): Leaving...\n"));
|
| 935 |
|
|
return 0;
|
| 936 |
|
|
} /* jffs_scan_flash() */
|
| 937 |
|
|
|
| 938 |
|
|
#endif
|
| 939 |
|
|
|
| 940 |
|
|
|
| 941 |
|
|
/* Insert any kind of node into the file system. Take care of data
|
| 942 |
|
|
insertions and deletions. Also remove redundant information. The
|
| 943 |
|
|
memory allocated for the `name' is regarded as "given away" in the
|
| 944 |
|
|
caller's perspective. */
|
| 945 |
|
|
int
|
| 946 |
|
|
jffs_insert_node(struct jffs_control *c, struct jffs_file *f,
|
| 947 |
|
|
const struct jffs_raw_inode *raw_inode,
|
| 948 |
|
|
const char *name, struct jffs_node *node)
|
| 949 |
|
|
{
|
| 950 |
|
|
int update_name = 0;
|
| 951 |
|
|
int insert_into_tree = 0;
|
| 952 |
|
|
|
| 953 |
|
|
D2(printk("jffs_insert_node(): ino = %u, version = %u, name = \"%s\"\n",
|
| 954 |
|
|
raw_inode->ino, raw_inode->version,
|
| 955 |
|
|
((name && *name) ? name : "")));
|
| 956 |
|
|
|
| 957 |
|
|
/* If there doesn't exist an associated jffs_file, then
|
| 958 |
|
|
create, initialize and insert one into the file system. */
|
| 959 |
|
|
if (!f && !(f = jffs_find_file(c, raw_inode->ino))) {
|
| 960 |
|
|
if (!(f = jffs_create_file(c, raw_inode))) {
|
| 961 |
|
|
return -ENOMEM;
|
| 962 |
|
|
}
|
| 963 |
|
|
jffs_insert_file_into_hash(f);
|
| 964 |
|
|
insert_into_tree = 1;
|
| 965 |
|
|
}
|
| 966 |
|
|
|
| 967 |
|
|
node->ino = raw_inode->ino;
|
| 968 |
|
|
node->version = raw_inode->version;
|
| 969 |
|
|
node->data_size = raw_inode->dsize;
|
| 970 |
|
|
node->fm_offset = sizeof(struct jffs_raw_inode) + raw_inode->nsize
|
| 971 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode->nsize);
|
| 972 |
|
|
node->name_size = raw_inode->nsize;
|
| 973 |
|
|
|
| 974 |
|
|
/* Now insert the node at the correct position into the file's
|
| 975 |
|
|
version list. */
|
| 976 |
|
|
if (!f->version_head) {
|
| 977 |
|
|
/* This is the first node. */
|
| 978 |
|
|
f->version_head = node;
|
| 979 |
|
|
f->version_tail = node;
|
| 980 |
|
|
node->version_prev = 0;
|
| 981 |
|
|
node->version_next = 0;
|
| 982 |
|
|
f->highest_version = node->version;
|
| 983 |
|
|
update_name = 1;
|
| 984 |
|
|
f->mode = raw_inode->mode;
|
| 985 |
|
|
f->uid = raw_inode->uid;
|
| 986 |
|
|
f->gid = raw_inode->gid;
|
| 987 |
|
|
f->atime = raw_inode->atime;
|
| 988 |
|
|
f->mtime = raw_inode->mtime;
|
| 989 |
|
|
f->ctime = raw_inode->ctime;
|
| 990 |
|
|
f->deleted = raw_inode->deleted;
|
| 991 |
|
|
}
|
| 992 |
|
|
else if ((f->highest_version < node->version)
|
| 993 |
|
|
|| (node->version == 0)) {
|
| 994 |
|
|
/* Insert at the end of the list. I.e. this node is the
|
| 995 |
|
|
oldest one so far. */
|
| 996 |
|
|
node->version_prev = f->version_tail;
|
| 997 |
|
|
node->version_next = 0;
|
| 998 |
|
|
f->version_tail->version_next = node;
|
| 999 |
|
|
f->version_tail = node;
|
| 1000 |
|
|
f->highest_version = node->version;
|
| 1001 |
|
|
update_name = 1;
|
| 1002 |
|
|
f->pino = raw_inode->pino;
|
| 1003 |
|
|
f->mode = raw_inode->mode;
|
| 1004 |
|
|
f->uid = raw_inode->uid;
|
| 1005 |
|
|
f->gid = raw_inode->gid;
|
| 1006 |
|
|
f->atime = raw_inode->atime;
|
| 1007 |
|
|
f->mtime = raw_inode->mtime;
|
| 1008 |
|
|
f->ctime = raw_inode->ctime;
|
| 1009 |
|
|
f->deleted = raw_inode->deleted;
|
| 1010 |
|
|
}
|
| 1011 |
|
|
else if (f->version_head->version > node->version) {
|
| 1012 |
|
|
/* Insert at the bottom of the list. */
|
| 1013 |
|
|
node->version_prev = 0;
|
| 1014 |
|
|
node->version_next = f->version_head;
|
| 1015 |
|
|
f->version_head->version_prev = node;
|
| 1016 |
|
|
f->version_head = node;
|
| 1017 |
|
|
if (!f->name) {
|
| 1018 |
|
|
update_name = 1;
|
| 1019 |
|
|
}
|
| 1020 |
|
|
if (raw_inode->deleted) {
|
| 1021 |
|
|
f->deleted = raw_inode->deleted;
|
| 1022 |
|
|
}
|
| 1023 |
|
|
}
|
| 1024 |
|
|
else {
|
| 1025 |
|
|
struct jffs_node *n;
|
| 1026 |
|
|
int newer_name = 0;
|
| 1027 |
|
|
/* Search for the insertion position starting from
|
| 1028 |
|
|
the tail (newest node). */
|
| 1029 |
|
|
for (n = f->version_tail; n; n = n->version_prev) {
|
| 1030 |
|
|
if (n->version < node->version) {
|
| 1031 |
|
|
node->version_prev = n;
|
| 1032 |
|
|
node->version_next = n->version_next;
|
| 1033 |
|
|
node->version_next->version_prev = node;
|
| 1034 |
|
|
n->version_next = node;
|
| 1035 |
|
|
if (!newer_name) {
|
| 1036 |
|
|
update_name = 1;
|
| 1037 |
|
|
}
|
| 1038 |
|
|
break;
|
| 1039 |
|
|
}
|
| 1040 |
|
|
if (n->name_size) {
|
| 1041 |
|
|
newer_name = 1;
|
| 1042 |
|
|
}
|
| 1043 |
|
|
}
|
| 1044 |
|
|
}
|
| 1045 |
|
|
|
| 1046 |
|
|
/* Perhaps update the name. */
|
| 1047 |
|
|
if (raw_inode->nsize && update_name && name && *name) {
|
| 1048 |
|
|
if (f->name) {
|
| 1049 |
|
|
kfree(f->name);
|
| 1050 |
|
|
DJM(no_name--);
|
| 1051 |
|
|
}
|
| 1052 |
|
|
if (!(f->name = (char *) kmalloc(raw_inode->nsize + 1,
|
| 1053 |
|
|
GFP_KERNEL))) {
|
| 1054 |
|
|
return -ENOMEM;
|
| 1055 |
|
|
}
|
| 1056 |
|
|
DJM(no_name++);
|
| 1057 |
|
|
memcpy(f->name, name, raw_inode->nsize);
|
| 1058 |
|
|
f->name[raw_inode->nsize] = '\0';
|
| 1059 |
|
|
f->nsize = raw_inode->nsize;
|
| 1060 |
|
|
D3(printk("jffs_insert_node(): Updated the name of "
|
| 1061 |
|
|
"the file to \"%s\".\n", name));
|
| 1062 |
|
|
}
|
| 1063 |
|
|
|
| 1064 |
|
|
if (!c->building_fs) {
|
| 1065 |
|
|
D3(printk("jffs_insert_node(): ---------------------------"
|
| 1066 |
|
|
"------------------------------------------- 1\n"));
|
| 1067 |
|
|
if (insert_into_tree) {
|
| 1068 |
|
|
jffs_insert_file_into_tree(f);
|
| 1069 |
|
|
}
|
| 1070 |
|
|
if (f->deleted) {
|
| 1071 |
|
|
/* Mark all versions of the node as obsolete. */
|
| 1072 |
|
|
jffs_possibly_delete_file(f);
|
| 1073 |
|
|
}
|
| 1074 |
|
|
else {
|
| 1075 |
|
|
if (node->data_size || node->removed_size) {
|
| 1076 |
|
|
jffs_update_file(f, node);
|
| 1077 |
|
|
}
|
| 1078 |
|
|
jffs_remove_redundant_nodes(f);
|
| 1079 |
|
|
}
|
| 1080 |
|
|
#ifdef USE_GC
|
| 1081 |
|
|
if (!c->fmc->no_call_gc) {
|
| 1082 |
|
|
jffs_garbage_collect(c);
|
| 1083 |
|
|
}
|
| 1084 |
|
|
#endif
|
| 1085 |
|
|
D3(printk("jffs_insert_node(): ---------------------------"
|
| 1086 |
|
|
"------------------------------------------- 2\n"));
|
| 1087 |
|
|
}
|
| 1088 |
|
|
|
| 1089 |
|
|
return 0;
|
| 1090 |
|
|
} /* jffs_insert_node() */
|
| 1091 |
|
|
|
| 1092 |
|
|
|
| 1093 |
|
|
/* Unlink a jffs_node from the version list it is in. */
|
| 1094 |
|
|
static inline void
|
| 1095 |
|
|
jffs_unlink_node_from_version_list(struct jffs_file *f,
|
| 1096 |
|
|
struct jffs_node *node)
|
| 1097 |
|
|
{
|
| 1098 |
|
|
if (node->version_prev) {
|
| 1099 |
|
|
node->version_prev->version_next = node->version_next;
|
| 1100 |
|
|
} else {
|
| 1101 |
|
|
f->version_head = node->version_next;
|
| 1102 |
|
|
}
|
| 1103 |
|
|
if (node->version_next) {
|
| 1104 |
|
|
node->version_next->version_prev = node->version_prev;
|
| 1105 |
|
|
} else {
|
| 1106 |
|
|
f->version_tail = node->version_prev;
|
| 1107 |
|
|
}
|
| 1108 |
|
|
}
|
| 1109 |
|
|
|
| 1110 |
|
|
|
| 1111 |
|
|
/* Unlink a jffs_node from the range list it is in. */
|
| 1112 |
|
|
static inline void
|
| 1113 |
|
|
jffs_unlink_node_from_range_list(struct jffs_file *f, struct jffs_node *node)
|
| 1114 |
|
|
{
|
| 1115 |
|
|
if (node->range_prev) {
|
| 1116 |
|
|
node->range_prev->range_next = node->range_next;
|
| 1117 |
|
|
}
|
| 1118 |
|
|
else {
|
| 1119 |
|
|
f->range_head = node->range_next;
|
| 1120 |
|
|
}
|
| 1121 |
|
|
if (node->range_next) {
|
| 1122 |
|
|
node->range_next->range_prev = node->range_prev;
|
| 1123 |
|
|
}
|
| 1124 |
|
|
else {
|
| 1125 |
|
|
f->range_tail = node->range_prev;
|
| 1126 |
|
|
}
|
| 1127 |
|
|
}
|
| 1128 |
|
|
|
| 1129 |
|
|
|
| 1130 |
|
|
/* Function used by jffs_remove_redundant_nodes() below. This function
|
| 1131 |
|
|
classifies what kind of information a node adds to a file. */
|
| 1132 |
|
|
static inline __u8
|
| 1133 |
|
|
jffs_classify_node(struct jffs_node *node)
|
| 1134 |
|
|
{
|
| 1135 |
|
|
__u8 mod_type = JFFS_MODIFY_INODE;
|
| 1136 |
|
|
|
| 1137 |
|
|
if (node->name_size) {
|
| 1138 |
|
|
mod_type |= JFFS_MODIFY_NAME;
|
| 1139 |
|
|
}
|
| 1140 |
|
|
if (node->data_size || node->removed_size) {
|
| 1141 |
|
|
mod_type |= JFFS_MODIFY_DATA;
|
| 1142 |
|
|
}
|
| 1143 |
|
|
return mod_type;
|
| 1144 |
|
|
}
|
| 1145 |
|
|
|
| 1146 |
|
|
|
| 1147 |
|
|
/* Remove redundant nodes from a file. Mark the on-flash memory
|
| 1148 |
|
|
as dirty. */
|
| 1149 |
|
|
int
|
| 1150 |
|
|
jffs_remove_redundant_nodes(struct jffs_file *f)
|
| 1151 |
|
|
{
|
| 1152 |
|
|
struct jffs_node *newest_node;
|
| 1153 |
|
|
struct jffs_node *cur;
|
| 1154 |
|
|
struct jffs_node *prev;
|
| 1155 |
|
|
__u8 newest_type;
|
| 1156 |
|
|
__u8 mod_type;
|
| 1157 |
|
|
__u8 node_with_name_later = 0;
|
| 1158 |
|
|
|
| 1159 |
|
|
if (!(newest_node = f->version_tail)) {
|
| 1160 |
|
|
return 0;
|
| 1161 |
|
|
}
|
| 1162 |
|
|
|
| 1163 |
|
|
/* What does the `newest_node' modify? */
|
| 1164 |
|
|
newest_type = jffs_classify_node(newest_node);
|
| 1165 |
|
|
node_with_name_later = newest_type & JFFS_MODIFY_NAME;
|
| 1166 |
|
|
|
| 1167 |
|
|
D3(printk("jffs_remove_redundant_nodes(): ino: %u, name: \"%s\", "
|
| 1168 |
|
|
"newest_type: %u\n", f->ino, (f->name ? f->name : ""),
|
| 1169 |
|
|
newest_type));
|
| 1170 |
|
|
|
| 1171 |
|
|
/* Traverse the file's nodes and determine which of them that are
|
| 1172 |
|
|
superfluous. Yeah, this might look very complex at first
|
| 1173 |
|
|
glance but it is actually very simple. */
|
| 1174 |
|
|
for (cur = newest_node->version_prev; cur; cur = prev) {
|
| 1175 |
|
|
prev = cur->version_prev;
|
| 1176 |
|
|
mod_type = jffs_classify_node(cur);
|
| 1177 |
|
|
if ((mod_type <= JFFS_MODIFY_INODE)
|
| 1178 |
|
|
|| ((newest_type & JFFS_MODIFY_NAME)
|
| 1179 |
|
|
&& (mod_type
|
| 1180 |
|
|
<= (JFFS_MODIFY_INODE + JFFS_MODIFY_NAME)))
|
| 1181 |
|
|
|| (cur->data_size == 0 && cur->removed_size
|
| 1182 |
|
|
&& !cur->version_prev && node_with_name_later)) {
|
| 1183 |
|
|
/* Yes, this node is redundant. Remove it. */
|
| 1184 |
|
|
D2(printk("jffs_remove_redundant_nodes(): "
|
| 1185 |
|
|
"Removing node: ino: %u, version: %u, "
|
| 1186 |
|
|
"mod_type: %u\n", cur->ino, cur->version,
|
| 1187 |
|
|
mod_type));
|
| 1188 |
|
|
jffs_unlink_node_from_version_list(f, cur);
|
| 1189 |
|
|
jffs_fmfree(f->c->fmc, cur->fm, cur);
|
| 1190 |
|
|
kfree(cur);
|
| 1191 |
|
|
DJM(no_jffs_node--);
|
| 1192 |
|
|
}
|
| 1193 |
|
|
else {
|
| 1194 |
|
|
node_with_name_later |= (mod_type & JFFS_MODIFY_NAME);
|
| 1195 |
|
|
}
|
| 1196 |
|
|
}
|
| 1197 |
|
|
|
| 1198 |
|
|
return 0;
|
| 1199 |
|
|
}
|
| 1200 |
|
|
|
| 1201 |
|
|
|
| 1202 |
|
|
/* Insert a file into the hash table. */
|
| 1203 |
|
|
int
|
| 1204 |
|
|
jffs_insert_file_into_hash(struct jffs_file *f)
|
| 1205 |
|
|
{
|
| 1206 |
|
|
int i = f->ino % f->c->hash_len;
|
| 1207 |
|
|
|
| 1208 |
|
|
D3(printk("jffs_insert_file_into_hash(): f->ino: %u\n", f->ino));
|
| 1209 |
|
|
|
| 1210 |
|
|
f->hash_next = f->c->hash[i];
|
| 1211 |
|
|
if (f->hash_next) {
|
| 1212 |
|
|
f->hash_next->hash_prev = f;
|
| 1213 |
|
|
}
|
| 1214 |
|
|
f->hash_prev = 0;
|
| 1215 |
|
|
f->c->hash[i] = f;
|
| 1216 |
|
|
return 0;
|
| 1217 |
|
|
}
|
| 1218 |
|
|
|
| 1219 |
|
|
|
| 1220 |
|
|
/* Insert a file into the file system tree. */
|
| 1221 |
|
|
int
|
| 1222 |
|
|
jffs_insert_file_into_tree(struct jffs_file *f)
|
| 1223 |
|
|
{
|
| 1224 |
|
|
struct jffs_file *parent;
|
| 1225 |
|
|
|
| 1226 |
|
|
D3(printk("jffs_insert_file_into_tree(): name: \"%s\"\n",
|
| 1227 |
|
|
(f->name ? f->name : "")));
|
| 1228 |
|
|
|
| 1229 |
|
|
if (!(parent = jffs_find_file(f->c, f->pino))) {
|
| 1230 |
|
|
if (f->pino == 0) {
|
| 1231 |
|
|
f->c->root = f;
|
| 1232 |
|
|
f->parent = 0;
|
| 1233 |
|
|
f->sibling_prev = 0;
|
| 1234 |
|
|
f->sibling_next = 0;
|
| 1235 |
|
|
return 0;
|
| 1236 |
|
|
}
|
| 1237 |
|
|
else {
|
| 1238 |
|
|
D1(printk("jffs_insert_file_into_tree(): Found "
|
| 1239 |
|
|
"inode with no parent and pino == %u\n",
|
| 1240 |
|
|
f->pino));
|
| 1241 |
|
|
return -1;
|
| 1242 |
|
|
}
|
| 1243 |
|
|
}
|
| 1244 |
|
|
f->parent = parent;
|
| 1245 |
|
|
f->sibling_next = parent->children;
|
| 1246 |
|
|
if (f->sibling_next) {
|
| 1247 |
|
|
f->sibling_next->sibling_prev = f;
|
| 1248 |
|
|
}
|
| 1249 |
|
|
f->sibling_prev = 0;
|
| 1250 |
|
|
parent->children = f;
|
| 1251 |
|
|
return 0;
|
| 1252 |
|
|
}
|
| 1253 |
|
|
|
| 1254 |
|
|
|
| 1255 |
|
|
/* Remove a file from the hash table. */
|
| 1256 |
|
|
int
|
| 1257 |
|
|
jffs_unlink_file_from_hash(struct jffs_file *f)
|
| 1258 |
|
|
{
|
| 1259 |
|
|
D3(printk("jffs_unlink_file_from_hash(): f: 0x%p, "
|
| 1260 |
|
|
"ino %u\n", f, f->ino));
|
| 1261 |
|
|
|
| 1262 |
|
|
if (f->hash_next) {
|
| 1263 |
|
|
f->hash_next->hash_prev = f->hash_prev;
|
| 1264 |
|
|
}
|
| 1265 |
|
|
if (f->hash_prev) {
|
| 1266 |
|
|
f->hash_prev->hash_next = f->hash_next;
|
| 1267 |
|
|
}
|
| 1268 |
|
|
else {
|
| 1269 |
|
|
f->c->hash[f->ino % f->c->hash_len] = f->hash_next;
|
| 1270 |
|
|
}
|
| 1271 |
|
|
return 0;
|
| 1272 |
|
|
}
|
| 1273 |
|
|
|
| 1274 |
|
|
|
| 1275 |
|
|
/* Just remove the file from the parent's children. Don't free
|
| 1276 |
|
|
any memory. */
|
| 1277 |
|
|
int
|
| 1278 |
|
|
jffs_unlink_file_from_tree(struct jffs_file *f)
|
| 1279 |
|
|
{
|
| 1280 |
|
|
D3(printk("jffs_unlink_file_from_tree(): ino: %d, name: "
|
| 1281 |
|
|
"\"%s\"\n", f->ino, (f->name ? f->name : "")));
|
| 1282 |
|
|
|
| 1283 |
|
|
if (f->sibling_prev) {
|
| 1284 |
|
|
f->sibling_prev->sibling_next = f->sibling_next;
|
| 1285 |
|
|
}
|
| 1286 |
|
|
else {
|
| 1287 |
|
|
f->parent->children = f->sibling_next;
|
| 1288 |
|
|
}
|
| 1289 |
|
|
if (f->sibling_next) {
|
| 1290 |
|
|
f->sibling_next->sibling_prev = f->sibling_prev;
|
| 1291 |
|
|
}
|
| 1292 |
|
|
return 0;
|
| 1293 |
|
|
}
|
| 1294 |
|
|
|
| 1295 |
|
|
|
| 1296 |
|
|
/* Find a file with its inode number. */
|
| 1297 |
|
|
struct jffs_file *
|
| 1298 |
|
|
jffs_find_file(struct jffs_control *c, __u32 ino)
|
| 1299 |
|
|
{
|
| 1300 |
|
|
struct jffs_file *f;
|
| 1301 |
|
|
int i = ino % c->hash_len;
|
| 1302 |
|
|
|
| 1303 |
|
|
D3(printk("jffs_find_file(): ino: %u\n", ino));
|
| 1304 |
|
|
|
| 1305 |
|
|
for (f = c->hash[i]; f && (ino != f->ino); f = f->hash_next);
|
| 1306 |
|
|
|
| 1307 |
|
|
D3(if (f) {
|
| 1308 |
|
|
printk("jffs_find_file(): Found file with ino "
|
| 1309 |
|
|
"%u. (name: \"%s\")\n",
|
| 1310 |
|
|
ino, (f->name ? f->name : ""));
|
| 1311 |
|
|
}
|
| 1312 |
|
|
else {
|
| 1313 |
|
|
printk("jffs_find_file(): Didn't find file "
|
| 1314 |
|
|
"with ino %u.\n", ino);
|
| 1315 |
|
|
});
|
| 1316 |
|
|
|
| 1317 |
|
|
return f;
|
| 1318 |
|
|
}
|
| 1319 |
|
|
|
| 1320 |
|
|
|
| 1321 |
|
|
/* Find a file in a directory. We are comparing the names. */
|
| 1322 |
|
|
struct jffs_file *
|
| 1323 |
|
|
jffs_find_child(struct jffs_file *dir, const char *name, int len)
|
| 1324 |
|
|
{
|
| 1325 |
|
|
struct jffs_file *f;
|
| 1326 |
|
|
|
| 1327 |
|
|
D3(printk("jffs_find_child()\n"));
|
| 1328 |
|
|
|
| 1329 |
|
|
for (f = dir->children; f; f = f->sibling_next) {
|
| 1330 |
|
|
if (f->name
|
| 1331 |
|
|
&& !strncmp(f->name, name, len)
|
| 1332 |
|
|
&& f->name[len] == '\0') {
|
| 1333 |
|
|
break;
|
| 1334 |
|
|
}
|
| 1335 |
|
|
}
|
| 1336 |
|
|
|
| 1337 |
|
|
D3(if (f) {
|
| 1338 |
|
|
printk("jffs_find_child(): Found \"%s\".\n", f->name);
|
| 1339 |
|
|
}
|
| 1340 |
|
|
else {
|
| 1341 |
|
|
char *copy = (char *) kmalloc(len + 1, GFP_KERNEL);
|
| 1342 |
|
|
if (copy) {
|
| 1343 |
|
|
memcpy(copy, name, len);
|
| 1344 |
|
|
copy[len] = '\0';
|
| 1345 |
|
|
}
|
| 1346 |
|
|
printk("jffs_find_child(): Didn't find the file \"%s\".\n",
|
| 1347 |
|
|
(copy ? copy : ""));
|
| 1348 |
|
|
if (copy) {
|
| 1349 |
|
|
kfree(copy);
|
| 1350 |
|
|
}
|
| 1351 |
|
|
});
|
| 1352 |
|
|
|
| 1353 |
|
|
return f;
|
| 1354 |
|
|
}
|
| 1355 |
|
|
|
| 1356 |
|
|
|
| 1357 |
|
|
#if !defined(JFFS_FLASH_SHORTCUT) || ! JFFS_FLASH_SHORTCUT
|
| 1358 |
|
|
|
| 1359 |
|
|
struct buffer_head *
|
| 1360 |
|
|
jffs_get_write_buffer(kdev_t dev, int block)
|
| 1361 |
|
|
{
|
| 1362 |
|
|
struct buffer_head *bh;
|
| 1363 |
|
|
|
| 1364 |
|
|
D3(printk("jffs_get_write_buffer(): block = %u\n", block));
|
| 1365 |
|
|
if (!(bh = bread(dev, block, BLOCK_SIZE))) {
|
| 1366 |
|
|
D(printk("jffs_get_write_buffer(): bread() failed. "
|
| 1367 |
|
|
"(block == %u)\n", block));
|
| 1368 |
|
|
}
|
| 1369 |
|
|
|
| 1370 |
|
|
D3(printk("jffs_get_write_buffer(): bh = 0x%08x\n", bh));
|
| 1371 |
|
|
return bh;
|
| 1372 |
|
|
}
|
| 1373 |
|
|
|
| 1374 |
|
|
void
|
| 1375 |
|
|
jffs_put_write_buffer(struct buffer_head *bh)
|
| 1376 |
|
|
{
|
| 1377 |
|
|
D3(printk("jffs_put_write_buffer(): bh = 0x%08x\n", bh));
|
| 1378 |
|
|
mark_buffer_dirty(bh, 1);
|
| 1379 |
|
|
ll_rw_block(WRITE, 1, &bh);
|
| 1380 |
|
|
wait_on_buffer(bh);
|
| 1381 |
|
|
brelse(bh);
|
| 1382 |
|
|
}
|
| 1383 |
|
|
|
| 1384 |
|
|
|
| 1385 |
|
|
/* Structure used by jffs_write_chunk() and jffs_write_node(). */
|
| 1386 |
|
|
struct jffs_write_task
|
| 1387 |
|
|
{
|
| 1388 |
|
|
struct buffer_head *bh;
|
| 1389 |
|
|
__u32 block;
|
| 1390 |
|
|
__u32 block_offset;
|
| 1391 |
|
|
};
|
| 1392 |
|
|
|
| 1393 |
|
|
|
| 1394 |
|
|
/* Write a chunk of data to the flash memory. This is a helper routine
|
| 1395 |
|
|
to jffs_write_node(). */
|
| 1396 |
|
|
int
|
| 1397 |
|
|
jffs_write_chunk(struct jffs_control *c, struct jffs_write_task *wt,
|
| 1398 |
|
|
const unsigned char *data, __u32 size)
|
| 1399 |
|
|
{
|
| 1400 |
|
|
int write_len = 0;
|
| 1401 |
|
|
int len;
|
| 1402 |
|
|
int buf_pos = 0;
|
| 1403 |
|
|
|
| 1404 |
|
|
D3(printk("jffs_write_chunk(): size = %u\n", size));
|
| 1405 |
|
|
|
| 1406 |
|
|
ASSERT(if (!wt) {
|
| 1407 |
|
|
printk("jffs_write_chunk(): wt == NULL\n");
|
| 1408 |
|
|
return -1;
|
| 1409 |
|
|
});
|
| 1410 |
|
|
|
| 1411 |
|
|
if (size == 0) {
|
| 1412 |
|
|
return 0;
|
| 1413 |
|
|
}
|
| 1414 |
|
|
|
| 1415 |
|
|
if (wt->block_offset == BLOCK_SIZE) {
|
| 1416 |
|
|
if (wt->bh) {
|
| 1417 |
|
|
jffs_put_write_buffer(wt->bh);
|
| 1418 |
|
|
wt->bh = 0;
|
| 1419 |
|
|
}
|
| 1420 |
|
|
wt->block++;
|
| 1421 |
|
|
wt->block_offset = 0;
|
| 1422 |
|
|
}
|
| 1423 |
|
|
|
| 1424 |
|
|
if (!wt->bh
|
| 1425 |
|
|
&& !(wt->bh = jffs_get_write_buffer(c->sb->s_dev, wt->block))) {
|
| 1426 |
|
|
return -1;
|
| 1427 |
|
|
}
|
| 1428 |
|
|
|
| 1429 |
|
|
while (write_len < size) {
|
| 1430 |
|
|
len = jffs_min(size - write_len,
|
| 1431 |
|
|
BLOCK_SIZE - wt->block_offset);
|
| 1432 |
|
|
memcpy(&wt->bh->b_data[wt->block_offset],
|
| 1433 |
|
|
&data[buf_pos], len);
|
| 1434 |
|
|
write_len += len;
|
| 1435 |
|
|
wt->block_offset += len;
|
| 1436 |
|
|
D3(printk(" write_len: %u\n", write_len));
|
| 1437 |
|
|
D3(printk(" len: %u\n", len));
|
| 1438 |
|
|
D3(printk(" size: %u\n", size));
|
| 1439 |
|
|
if (write_len < size) {
|
| 1440 |
|
|
jffs_put_write_buffer(wt->bh);
|
| 1441 |
|
|
wt->block++;
|
| 1442 |
|
|
wt->block_offset = 0;
|
| 1443 |
|
|
wt->bh = 0;
|
| 1444 |
|
|
if (!(wt->bh = jffs_get_write_buffer(c->sb->s_dev,
|
| 1445 |
|
|
wt->block))) {
|
| 1446 |
|
|
return write_len;
|
| 1447 |
|
|
}
|
| 1448 |
|
|
buf_pos += len;
|
| 1449 |
|
|
}
|
| 1450 |
|
|
}
|
| 1451 |
|
|
|
| 1452 |
|
|
return write_len;
|
| 1453 |
|
|
}
|
| 1454 |
|
|
#endif
|
| 1455 |
|
|
|
| 1456 |
|
|
|
| 1457 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 1458 |
|
|
|
| 1459 |
|
|
/* Write a raw inode that takes up a certain amount of space in the flash
|
| 1460 |
|
|
memory. At the end of the flash device, there is often space that is
|
| 1461 |
|
|
impossible to use. At these times we want to mark this space as not
|
| 1462 |
|
|
used. In the cases when the amount of space is greater or equal than
|
| 1463 |
|
|
a struct jffs_raw_inode, we write a "dummy node" that takes up this
|
| 1464 |
|
|
space. The space after the raw inode, if it exists, is left as it is.
|
| 1465 |
|
|
Since this space after the raw inode contains JFFS_EMPTY_BITMASK bytes,
|
| 1466 |
|
|
we can compute the checksum of it; we don't have to manipulate it any
|
| 1467 |
|
|
further.
|
| 1468 |
|
|
|
| 1469 |
|
|
If the space left on the device is less than the size of a struct
|
| 1470 |
|
|
jffs_raw_inode, this space is filled with JFFS_DIRTY_BITMASK bytes.
|
| 1471 |
|
|
No raw inode is written this time. */
|
| 1472 |
|
|
static int
|
| 1473 |
|
|
jffs_write_dummy_node(struct jffs_control *c, struct jffs_fm *dirty_fm)
|
| 1474 |
|
|
{
|
| 1475 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 1476 |
|
|
int err;
|
| 1477 |
|
|
|
| 1478 |
|
|
D1(printk("jffs_write_dummy_node(): dirty_fm->offset = 0x%08x, "
|
| 1479 |
|
|
"dirty_fm->size = %u\n",
|
| 1480 |
|
|
dirty_fm->offset, dirty_fm->size));
|
| 1481 |
|
|
|
| 1482 |
|
|
if (dirty_fm->size >= sizeof(struct jffs_raw_inode)) {
|
| 1483 |
|
|
struct jffs_raw_inode raw_inode;
|
| 1484 |
|
|
memset(&raw_inode, 0, sizeof(struct jffs_raw_inode));
|
| 1485 |
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
| 1486 |
|
|
raw_inode.dsize = dirty_fm->size
|
| 1487 |
|
|
- sizeof(struct jffs_raw_inode);
|
| 1488 |
|
|
raw_inode.dchksum = raw_inode.dsize * 0xff;
|
| 1489 |
|
|
raw_inode.chksum
|
| 1490 |
|
|
= jffs_checksum(&raw_inode, sizeof(struct jffs_raw_inode));
|
| 1491 |
|
|
|
| 1492 |
|
|
if ((err = flash_safe_write(fmc->flash_part,
|
| 1493 |
|
|
(unsigned char *)dirty_fm->offset,
|
| 1494 |
|
|
(unsigned char *)&raw_inode,
|
| 1495 |
|
|
sizeof(struct jffs_raw_inode)))
|
| 1496 |
|
|
< 0) {
|
| 1497 |
|
|
return err;
|
| 1498 |
|
|
}
|
| 1499 |
|
|
}
|
| 1500 |
|
|
else {
|
| 1501 |
|
|
flash_safe_acquire(fmc->flash_part);
|
| 1502 |
|
|
flash_memset((unsigned char *) dirty_fm->offset, 0,
|
| 1503 |
|
|
dirty_fm->size);
|
| 1504 |
|
|
flash_safe_release(fmc->flash_part);
|
| 1505 |
|
|
}
|
| 1506 |
|
|
|
| 1507 |
|
|
D3(printk("jffs_write_dummy_node(): Leaving...\n"));
|
| 1508 |
|
|
return 0;
|
| 1509 |
|
|
}
|
| 1510 |
|
|
|
| 1511 |
|
|
#else
|
| 1512 |
|
|
|
| 1513 |
|
|
|
| 1514 |
|
|
/* Write a raw inode that takes up a certain amount of space in the flash
|
| 1515 |
|
|
memory. */
|
| 1516 |
|
|
static int
|
| 1517 |
|
|
jffs_write_dummy_node(struct jffs_control *c, struct jffs_fm *dirty_fm)
|
| 1518 |
|
|
{
|
| 1519 |
|
|
struct jffs_raw_inode raw_inode;
|
| 1520 |
|
|
struct buffer_head *bh;
|
| 1521 |
|
|
__u32 block = dirty_fm->offset / BLOCK_SIZE;
|
| 1522 |
|
|
__u32 block_offset = dirty_fm->offset - block * BLOCK_SIZE;
|
| 1523 |
|
|
kdev_t dev = c->sb->s_dev;
|
| 1524 |
|
|
|
| 1525 |
|
|
D1(printk("jffs_write_dummy_node(): dirty_fm->offset = %u, "
|
| 1526 |
|
|
"dirty_fm->size = %u\n",
|
| 1527 |
|
|
dirty_fm->offset, dirty_fm->size));
|
| 1528 |
|
|
|
| 1529 |
|
|
if (!(bh = jffs_get_write_buffer(dev, block))) {
|
| 1530 |
|
|
D(printk("jffs_write_dummy_node(): "
|
| 1531 |
|
|
"Failed to read block.\n"));
|
| 1532 |
|
|
return -1;
|
| 1533 |
|
|
}
|
| 1534 |
|
|
|
| 1535 |
|
|
memset(&raw_inode, 0, sizeof(struct jffs_raw_inode));
|
| 1536 |
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
| 1537 |
|
|
raw_inode.dsize = dirty_fm->size - sizeof(struct jffs_raw_inode);
|
| 1538 |
|
|
raw_inode.chksum = jffs_checksum(&raw_inode,
|
| 1539 |
|
|
sizeof(struct jffs_raw_inode))
|
| 1540 |
|
|
+ raw_inode.dsize * 0xff;
|
| 1541 |
|
|
|
| 1542 |
|
|
if (BLOCK_SIZE - block_offset < sizeof(struct jffs_raw_inode)) {
|
| 1543 |
|
|
__u32 write_size = BLOCK_SIZE - block_offset;
|
| 1544 |
|
|
memcpy(&bh->b_data[block_offset], &raw_inode, write_size);
|
| 1545 |
|
|
jffs_put_write_buffer(bh);
|
| 1546 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 1547 |
|
|
memcpy(bh->b_data, (void *)&raw_inode + write_size,
|
| 1548 |
|
|
sizeof(struct jffs_raw_inode) - write_size);
|
| 1549 |
|
|
}
|
| 1550 |
|
|
else {
|
| 1551 |
|
|
memcpy(&bh->b_data[block_offset], &raw_inode,
|
| 1552 |
|
|
sizeof(struct jffs_raw_inode));
|
| 1553 |
|
|
}
|
| 1554 |
|
|
|
| 1555 |
|
|
jffs_put_write_buffer(bh);
|
| 1556 |
|
|
D3(printk("jffs_write_dummy_node(): Leaving...\n"));
|
| 1557 |
|
|
return 0;
|
| 1558 |
|
|
}
|
| 1559 |
|
|
|
| 1560 |
|
|
#endif
|
| 1561 |
|
|
|
| 1562 |
|
|
|
| 1563 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 1564 |
|
|
|
| 1565 |
|
|
/* Write a raw inode, possibly its name and possibly some data. */
|
| 1566 |
|
|
int
|
| 1567 |
|
|
jffs_write_node(struct jffs_control *c, struct jffs_node *node,
|
| 1568 |
|
|
struct jffs_raw_inode *raw_inode,
|
| 1569 |
|
|
const char *name, const unsigned char *data)
|
| 1570 |
|
|
{
|
| 1571 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 1572 |
|
|
struct jffs_fm *fm;
|
| 1573 |
|
|
unsigned char *pos;
|
| 1574 |
|
|
int err;
|
| 1575 |
|
|
__u32 total_name_size = raw_inode->nsize
|
| 1576 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode->nsize);
|
| 1577 |
|
|
__u32 total_data_size = raw_inode->dsize
|
| 1578 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode->dsize);
|
| 1579 |
|
|
__u32 total_size = sizeof(struct jffs_raw_inode)
|
| 1580 |
|
|
+ total_name_size + total_data_size;
|
| 1581 |
|
|
|
| 1582 |
|
|
/* Fire the retrorockets and shoot the fruiton torpedoes, sir! */
|
| 1583 |
|
|
|
| 1584 |
|
|
ASSERT(if (!node) {
|
| 1585 |
|
|
printk("jffs_write_node(): node == NULL\n");
|
| 1586 |
|
|
return -EINVAL;
|
| 1587 |
|
|
});
|
| 1588 |
|
|
ASSERT(if (raw_inode && raw_inode->nsize && !name) {
|
| 1589 |
|
|
printk("*** jffs_write_node(): nsize = %u but name == NULL\n",
|
| 1590 |
|
|
raw_inode->nsize);
|
| 1591 |
|
|
return -EINVAL;
|
| 1592 |
|
|
});
|
| 1593 |
|
|
|
| 1594 |
|
|
D1(printk("jffs_write_node(): filename = \"%s\", ino = %u, "
|
| 1595 |
|
|
"version = %u, total_size = %u\n",
|
| 1596 |
|
|
(name ? name : ""), raw_inode->ino,
|
| 1597 |
|
|
raw_inode->version, total_size));
|
| 1598 |
|
|
|
| 1599 |
|
|
/* First try to allocate some flash memory. */
|
| 1600 |
|
|
if ((err = jffs_fmalloc(fmc, total_size, node, &fm)) < 0) {
|
| 1601 |
|
|
D(printk("jffs_write_node(): jffs_fmalloc(0x%p, %u) "
|
| 1602 |
|
|
"failed!\n", fmc, total_size));
|
| 1603 |
|
|
return err;
|
| 1604 |
|
|
}
|
| 1605 |
|
|
else if (!fm->nodes) {
|
| 1606 |
|
|
/* The jffs_fm struct that we got is not good enough.
|
| 1607 |
|
|
Make that space dirty. */
|
| 1608 |
|
|
if ((err = jffs_write_dummy_node(c, fm)) < 0) {
|
| 1609 |
|
|
D(printk("jffs_write_node(): "
|
| 1610 |
|
|
"jffs_write_dummy_node(): Failed!\n"));
|
| 1611 |
|
|
kfree(fm);
|
| 1612 |
|
|
DJM(no_jffs_fm--);
|
| 1613 |
|
|
return err;
|
| 1614 |
|
|
}
|
| 1615 |
|
|
/* Get a new one. */
|
| 1616 |
|
|
if ((err = jffs_fmalloc(fmc, total_size, node, &fm)) < 0) {
|
| 1617 |
|
|
D(printk("jffs_write_node(): Second "
|
| 1618 |
|
|
"jffs_fmalloc(0x%p, %u) failed!\n",
|
| 1619 |
|
|
fmc, total_size));
|
| 1620 |
|
|
return err;
|
| 1621 |
|
|
}
|
| 1622 |
|
|
}
|
| 1623 |
|
|
node->fm = fm;
|
| 1624 |
|
|
|
| 1625 |
|
|
ASSERT(if (fm->nodes == 0) {
|
| 1626 |
|
|
printk(KERN_ERR "jffs_write_node(): fm->nodes == 0\n");
|
| 1627 |
|
|
});
|
| 1628 |
|
|
|
| 1629 |
|
|
pos = (unsigned char *) node->fm->offset;
|
| 1630 |
|
|
|
| 1631 |
|
|
/* Compute the checksum for the data and name chunks. */
|
| 1632 |
|
|
raw_inode->dchksum = jffs_checksum(data, raw_inode->dsize);
|
| 1633 |
|
|
raw_inode->nchksum = jffs_checksum(name, raw_inode->nsize);
|
| 1634 |
|
|
|
| 1635 |
|
|
/* The checksum is calculated without the chksum and accurate
|
| 1636 |
|
|
fields so set them to zero first. */
|
| 1637 |
|
|
raw_inode->accurate = 0;
|
| 1638 |
|
|
raw_inode->chksum = 0;
|
| 1639 |
|
|
raw_inode->chksum = jffs_checksum(raw_inode,
|
| 1640 |
|
|
sizeof(struct jffs_raw_inode));
|
| 1641 |
|
|
raw_inode->accurate = 0xff;
|
| 1642 |
|
|
|
| 1643 |
|
|
D3(printk("jffs_write_node(): About to write this raw inode to the "
|
| 1644 |
|
|
"flash at pos 0x%p:\n", pos));
|
| 1645 |
|
|
D3(jffs_print_raw_inode(raw_inode));
|
| 1646 |
|
|
|
| 1647 |
|
|
/* Step 1: Write the raw jffs inode to the flash. */
|
| 1648 |
|
|
if ((err = flash_safe_write(fmc->flash_part, pos,
|
| 1649 |
|
|
(unsigned char *)raw_inode,
|
| 1650 |
|
|
sizeof(struct jffs_raw_inode))) < 0) {
|
| 1651 |
|
|
jffs_fmfree_partly(fmc, fm,
|
| 1652 |
|
|
total_name_size + total_data_size);
|
| 1653 |
|
|
D1(printk("jffs_write_node(): Failed to write raw_inode.\n"));
|
| 1654 |
|
|
return err;
|
| 1655 |
|
|
}
|
| 1656 |
|
|
pos += sizeof(struct jffs_raw_inode);
|
| 1657 |
|
|
|
| 1658 |
|
|
/* Step 2: Write the name, if there is any. */
|
| 1659 |
|
|
if (raw_inode->nsize) {
|
| 1660 |
|
|
if ((err = flash_safe_write(fmc->flash_part, pos,
|
| 1661 |
|
|
(unsigned char *)name,
|
| 1662 |
|
|
raw_inode->nsize)) < 0) {
|
| 1663 |
|
|
jffs_fmfree_partly(fmc, fm, total_data_size);
|
| 1664 |
|
|
D1(printk("jffs_write_node(): Failed to write "
|
| 1665 |
|
|
"the name.\n"));
|
| 1666 |
|
|
return err;
|
| 1667 |
|
|
}
|
| 1668 |
|
|
pos += total_name_size;
|
| 1669 |
|
|
}
|
| 1670 |
|
|
|
| 1671 |
|
|
/* Step 3: Append the actual data, if any. */
|
| 1672 |
|
|
if (raw_inode->dsize) {
|
| 1673 |
|
|
if ((err = flash_safe_write(fmc->flash_part, pos, data,
|
| 1674 |
|
|
raw_inode->dsize)) < 0) {
|
| 1675 |
|
|
jffs_fmfree_partly(fmc, fm, 0);
|
| 1676 |
|
|
D1(printk("jffs_write_node(): Failed to write "
|
| 1677 |
|
|
"the data.\n"));
|
| 1678 |
|
|
return err;
|
| 1679 |
|
|
}
|
| 1680 |
|
|
}
|
| 1681 |
|
|
|
| 1682 |
|
|
D3(printk("jffs_write_node(): Leaving...\n"));
|
| 1683 |
|
|
return raw_inode->dsize;
|
| 1684 |
|
|
} /* jffs_write_node() */
|
| 1685 |
|
|
|
| 1686 |
|
|
#else
|
| 1687 |
|
|
|
| 1688 |
|
|
/* Write a raw inode, possibly its name and possibly some data. */
|
| 1689 |
|
|
int
|
| 1690 |
|
|
jffs_write_node(struct jffs_control *c, struct jffs_node *node,
|
| 1691 |
|
|
struct jffs_raw_inode *raw_inode,
|
| 1692 |
|
|
const char *name, const unsigned char *buf)
|
| 1693 |
|
|
{
|
| 1694 |
|
|
struct jffs_write_task wt;
|
| 1695 |
|
|
struct jffs_fm *fm;
|
| 1696 |
|
|
int err;
|
| 1697 |
|
|
__u32 total_size = sizeof(struct jffs_raw_inode)
|
| 1698 |
|
|
+ raw_inode->nsize
|
| 1699 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode->nsize)
|
| 1700 |
|
|
+ raw_inode->dsize
|
| 1701 |
|
|
+ JFFS_GET_PAD_BYTES(raw_inode->dsize);
|
| 1702 |
|
|
|
| 1703 |
|
|
/* fire the retrorockets and shoot the fruiton torpedoes, sir! */
|
| 1704 |
|
|
|
| 1705 |
|
|
D1(printk("jffs_write_node(): ino: %u\n", raw_inode->ino));
|
| 1706 |
|
|
|
| 1707 |
|
|
ASSERT(if (!node) {
|
| 1708 |
|
|
printk("jffs_write_node(): node == NULL\n");
|
| 1709 |
|
|
return -1;
|
| 1710 |
|
|
});
|
| 1711 |
|
|
|
| 1712 |
|
|
/* First try to allocate some flash memory. */
|
| 1713 |
|
|
if ((err = jffs_fmalloc(c->fmc, total_size, node, &fm)) < 0 ) {
|
| 1714 |
|
|
D(printk("jffs_write_node(): jffs_fmalloc(0x%08x, %u) "
|
| 1715 |
|
|
"failed!\n", c->fmc, total_size));
|
| 1716 |
|
|
return err;
|
| 1717 |
|
|
}
|
| 1718 |
|
|
else if (!fm->nodes) {
|
| 1719 |
|
|
/* The jffs_fm struct that we got is not good enough. */
|
| 1720 |
|
|
if (jffs_write_dummy_node(c, fm) < 0) {
|
| 1721 |
|
|
D(printk("jffs_write_node(): "
|
| 1722 |
|
|
"jffs_write_dummy_node(): Failed!\n"));
|
| 1723 |
|
|
kfree(fm);
|
| 1724 |
|
|
DJM(no_jffs_fm--);
|
| 1725 |
|
|
return -1;
|
| 1726 |
|
|
}
|
| 1727 |
|
|
/* Get a new one. */
|
| 1728 |
|
|
if ((err = jffs_fmalloc(c->fmc, total_size, node)) < 0) {
|
| 1729 |
|
|
D(printk("jffs_write_node(): Second "
|
| 1730 |
|
|
"jffs_fmalloc(0x%08x, %u) failed!\n",
|
| 1731 |
|
|
c->fmc, total_size));
|
| 1732 |
|
|
return err;
|
| 1733 |
|
|
}
|
| 1734 |
|
|
}
|
| 1735 |
|
|
node->fm = fm;
|
| 1736 |
|
|
|
| 1737 |
|
|
ASSERT(if (fm->nodes == 0) {
|
| 1738 |
|
|
printk(KERN_ERR "jffs_write_node(): fm->nodes == 0\n");
|
| 1739 |
|
|
});
|
| 1740 |
|
|
|
| 1741 |
|
|
wt.bh = 0;
|
| 1742 |
|
|
wt.block = node->fm->offset / BLOCK_SIZE;
|
| 1743 |
|
|
wt.block_offset = node->fm->offset % BLOCK_SIZE;
|
| 1744 |
|
|
|
| 1745 |
|
|
/* Calculate the checksum for this jffs_raw_node and its name
|
| 1746 |
|
|
and data. The checksum is performed without the chksum and
|
| 1747 |
|
|
accurate fields so set them to zero first. */
|
| 1748 |
|
|
raw_inode->accurate = 0;
|
| 1749 |
|
|
raw_inode->chksum = 0;
|
| 1750 |
|
|
raw_inode->chksum = jffs_checksum(raw_inode,
|
| 1751 |
|
|
sizeof(struct jffs_raw_inode));
|
| 1752 |
|
|
raw_inode->accurate = 0xff;
|
| 1753 |
|
|
if (raw_inode->nsize) {
|
| 1754 |
|
|
raw_inode->chksum += jffs_checksum(name, raw_inode->nsize);
|
| 1755 |
|
|
}
|
| 1756 |
|
|
if (raw_inode->dsize) {
|
| 1757 |
|
|
raw_inode->chksum += jffs_checksum((void *)buf,
|
| 1758 |
|
|
raw_inode->dsize);
|
| 1759 |
|
|
}
|
| 1760 |
|
|
|
| 1761 |
|
|
/* Step 1: Write the raw jffs inode to the flash. */
|
| 1762 |
|
|
if (jffs_write_chunk(c, &wt, (unsigned char *)raw_inode,
|
| 1763 |
|
|
sizeof(struct jffs_raw_inode))
|
| 1764 |
|
|
< sizeof(struct jffs_raw_inode)) {
|
| 1765 |
|
|
return -1;
|
| 1766 |
|
|
}
|
| 1767 |
|
|
|
| 1768 |
|
|
/* Step 2: Write the name, if there is any. */
|
| 1769 |
|
|
if (raw_inode->nsize && name) {
|
| 1770 |
|
|
if (jffs_write_chunk(c, &wt, name, raw_inode->nsize)
|
| 1771 |
|
|
< raw_inode->nsize) {
|
| 1772 |
|
|
return -1;
|
| 1773 |
|
|
}
|
| 1774 |
|
|
/* XXX: Hack! (I'm so lazy.) */
|
| 1775 |
|
|
if (JFFS_GET_PAD_BYTES(wt.block_offset)) {
|
| 1776 |
|
|
__u32 ff = 0xffffffff
|
| 1777 |
|
|
jffs_write_chunk(c, &wt, (unsigned char *)&ff,
|
| 1778 |
|
|
JFFS_GET_PAD_BYTES(wt.block_offset));
|
| 1779 |
|
|
}
|
| 1780 |
|
|
}
|
| 1781 |
|
|
|
| 1782 |
|
|
/* Step 3: Append the actual data, if any. */
|
| 1783 |
|
|
if (raw_inode->dsize && buf) {
|
| 1784 |
|
|
if (jffs_write_chunk(c, &wt, buf, raw_inode->dsize)
|
| 1785 |
|
|
< raw_inode->dsize) {
|
| 1786 |
|
|
return -1;
|
| 1787 |
|
|
}
|
| 1788 |
|
|
}
|
| 1789 |
|
|
|
| 1790 |
|
|
if (wt.bh) {
|
| 1791 |
|
|
D3(printk("jffs_write_node(): wt.bh != NULL, Final write.\n"));
|
| 1792 |
|
|
jffs_put_write_buffer(wt.bh);
|
| 1793 |
|
|
}
|
| 1794 |
|
|
|
| 1795 |
|
|
D3(printk("jffs_write_node(): Leaving...\n"));
|
| 1796 |
|
|
return raw_inode->dsize;
|
| 1797 |
|
|
}
|
| 1798 |
|
|
|
| 1799 |
|
|
#endif
|
| 1800 |
|
|
|
| 1801 |
|
|
|
| 1802 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 1803 |
|
|
|
| 1804 |
|
|
/* Read data from the node and write it to the buffer. 'node_offset'
|
| 1805 |
|
|
is how much we have read from this particular node before and which
|
| 1806 |
|
|
shouldn't be read again. 'max_size' is how much space there is in
|
| 1807 |
|
|
the buffer. */
|
| 1808 |
|
|
static int
|
| 1809 |
|
|
jffs_get_node_data(struct jffs_file *f, struct jffs_node *node, char *buf,
|
| 1810 |
|
|
__u32 node_offset, __u32 max_size, kdev_t dev)
|
| 1811 |
|
|
{
|
| 1812 |
|
|
struct jffs_fmcontrol *fmc = f->c->fmc;
|
| 1813 |
|
|
__u32 pos = node->fm->offset + node->fm_offset + node_offset;
|
| 1814 |
|
|
__u32 avail = node->data_size - node_offset;
|
| 1815 |
|
|
__u32 r;
|
| 1816 |
|
|
|
| 1817 |
|
|
D2(printk(" jffs_get_node_data(): file: \"%s\", ino: %u, "
|
| 1818 |
|
|
"version: %u, node_offset: %u\n",
|
| 1819 |
|
|
f->name, node->ino, node->version, node_offset));
|
| 1820 |
|
|
|
| 1821 |
|
|
r = jffs_min(avail, max_size);
|
| 1822 |
|
|
flash_safe_read(fmc->flash_part, (unsigned char *) pos,
|
| 1823 |
|
|
(unsigned char *)buf, r);
|
| 1824 |
|
|
|
| 1825 |
|
|
D3(printk(" jffs_get_node_data(): Read %u byte%s.\n",
|
| 1826 |
|
|
r, (r == 1 ? "" : "s")));
|
| 1827 |
|
|
|
| 1828 |
|
|
return r;
|
| 1829 |
|
|
}
|
| 1830 |
|
|
|
| 1831 |
|
|
#else
|
| 1832 |
|
|
|
| 1833 |
|
|
/* Read data from the node and write it to the buffer. 'node_offset'
|
| 1834 |
|
|
is how much we have read from this particular node before and which
|
| 1835 |
|
|
shouldn't be read again. 'max_size' is how much space there is in
|
| 1836 |
|
|
the buffer. */
|
| 1837 |
|
|
static int
|
| 1838 |
|
|
jffs_get_node_data(struct jffs_file *f, struct jffs_node *node,
|
| 1839 |
|
|
char *buf, __u32 node_offset,
|
| 1840 |
|
|
__u32 max_size, kdev_t dev)
|
| 1841 |
|
|
{
|
| 1842 |
|
|
struct buffer_head *bh;
|
| 1843 |
|
|
__u32 first = node->fm->offset + node->fm_offset + node_offset;
|
| 1844 |
|
|
__u32 block = first / BLOCK_SIZE;
|
| 1845 |
|
|
__u32 block_offset = first - block * BLOCK_SIZE;
|
| 1846 |
|
|
__u32 read_len;
|
| 1847 |
|
|
__u32 total_read = 0;
|
| 1848 |
|
|
__u32 avail = node->data_size - node_offset;
|
| 1849 |
|
|
|
| 1850 |
|
|
D2(printk("jffs_get_node_data(): file: \"%s\", ino: %lu, "
|
| 1851 |
|
|
"version: %lu, node_offset: %lu\n",
|
| 1852 |
|
|
f->name, node->ino, node->version, node_offset));
|
| 1853 |
|
|
|
| 1854 |
|
|
while ((total_read < max_size) && (avail > 0)) {
|
| 1855 |
|
|
read_len = jffs_min(avail, BLOCK_SIZE - block_offset);
|
| 1856 |
|
|
read_len = jffs_min(read_len, max_size - total_read);
|
| 1857 |
|
|
if (!(bh = bread(dev, block, BLOCK_SIZE))) {
|
| 1858 |
|
|
D(printk("jffs_get_node_data(): bread() failed. "
|
| 1859 |
|
|
"(block == %u)\n", block));
|
| 1860 |
|
|
return -EIO;
|
| 1861 |
|
|
}
|
| 1862 |
|
|
memcpy(&buf[total_read], &bh->b_data[block_offset], read_len);
|
| 1863 |
|
|
brelse(bh);
|
| 1864 |
|
|
block++;
|
| 1865 |
|
|
avail -= read_len;
|
| 1866 |
|
|
total_read += read_len;
|
| 1867 |
|
|
block_offset = 0;
|
| 1868 |
|
|
}
|
| 1869 |
|
|
|
| 1870 |
|
|
return total_read;
|
| 1871 |
|
|
}
|
| 1872 |
|
|
|
| 1873 |
|
|
#endif
|
| 1874 |
|
|
|
| 1875 |
|
|
|
| 1876 |
|
|
/* Read data from the file's nodes. Write the data to the buffer
|
| 1877 |
|
|
'buf'. 'read_offset' tells how much data we should skip. */
|
| 1878 |
|
|
int
|
| 1879 |
|
|
jffs_read_data(struct jffs_file *f, char *buf, __u32 read_offset, __u32 size)
|
| 1880 |
|
|
{
|
| 1881 |
|
|
struct jffs_node *node;
|
| 1882 |
|
|
__u32 read_data = 0; /* Total amount of read data. */
|
| 1883 |
|
|
__u32 node_offset = 0;
|
| 1884 |
|
|
__u32 pos = 0; /* Number of bytes traversed. */
|
| 1885 |
|
|
|
| 1886 |
|
|
D1(printk("jffs_read_data(): file = \"%s\", read_offset = %d, "
|
| 1887 |
|
|
"size = %u\n",
|
| 1888 |
|
|
(f->name ? f->name : ""), read_offset, size));
|
| 1889 |
|
|
|
| 1890 |
|
|
if (read_offset >= f->size) {
|
| 1891 |
|
|
D(printk(" f->size: %d\n", f->size));
|
| 1892 |
|
|
return 0;
|
| 1893 |
|
|
}
|
| 1894 |
|
|
|
| 1895 |
|
|
/* First find the node to read data from. */
|
| 1896 |
|
|
node = f->range_head;
|
| 1897 |
|
|
while (pos <= read_offset) {
|
| 1898 |
|
|
node_offset = read_offset - pos;
|
| 1899 |
|
|
if (node_offset >= node->data_size) {
|
| 1900 |
|
|
pos += node->data_size;
|
| 1901 |
|
|
node = node->range_next;
|
| 1902 |
|
|
}
|
| 1903 |
|
|
else {
|
| 1904 |
|
|
break;
|
| 1905 |
|
|
}
|
| 1906 |
|
|
}
|
| 1907 |
|
|
|
| 1908 |
|
|
/* "Cats are living proof that not everything in nature
|
| 1909 |
|
|
has to be useful."
|
| 1910 |
|
|
- Garrison Keilor ('97) */
|
| 1911 |
|
|
|
| 1912 |
|
|
/* Fill the buffer. */
|
| 1913 |
|
|
while (node && (read_data < size)) {
|
| 1914 |
|
|
int r;
|
| 1915 |
|
|
if (!node->fm) {
|
| 1916 |
|
|
/* This node does not refer to real data. */
|
| 1917 |
|
|
r = jffs_min(size - read_data,
|
| 1918 |
|
|
node->data_size - node_offset);
|
| 1919 |
|
|
memset(&buf[read_data], 0, r);
|
| 1920 |
|
|
}
|
| 1921 |
|
|
else if ((r = jffs_get_node_data(f, node, &buf[read_data],
|
| 1922 |
|
|
node_offset,
|
| 1923 |
|
|
size - read_data,
|
| 1924 |
|
|
f->c->sb->s_dev)) < 0) {
|
| 1925 |
|
|
return r;
|
| 1926 |
|
|
}
|
| 1927 |
|
|
read_data += r;
|
| 1928 |
|
|
node_offset = 0;
|
| 1929 |
|
|
node = node->range_next;
|
| 1930 |
|
|
}
|
| 1931 |
|
|
D3(printk(" jffs_read_data(): Read %u bytes.\n", read_data));
|
| 1932 |
|
|
return read_data;
|
| 1933 |
|
|
}
|
| 1934 |
|
|
|
| 1935 |
|
|
|
| 1936 |
|
|
/* Used for traversing all nodes in the hash table. */
|
| 1937 |
|
|
int
|
| 1938 |
|
|
jffs_foreach_file(struct jffs_control *c, int (*func)(struct jffs_file *))
|
| 1939 |
|
|
{
|
| 1940 |
|
|
struct jffs_file *f;
|
| 1941 |
|
|
struct jffs_file *next_f;
|
| 1942 |
|
|
int pos;
|
| 1943 |
|
|
int r;
|
| 1944 |
|
|
int result = 0;
|
| 1945 |
|
|
|
| 1946 |
|
|
for (pos = 0; pos < c->hash_len; pos++) {
|
| 1947 |
|
|
for (f = c->hash[pos]; f; f = next_f) {
|
| 1948 |
|
|
/* We need a reference to the next file in the
|
| 1949 |
|
|
list because `func' might remove the current
|
| 1950 |
|
|
file `f'. */
|
| 1951 |
|
|
next_f = f->hash_next;
|
| 1952 |
|
|
if ((r = func(f)) < 0) {
|
| 1953 |
|
|
return r;
|
| 1954 |
|
|
}
|
| 1955 |
|
|
result += r;
|
| 1956 |
|
|
}
|
| 1957 |
|
|
}
|
| 1958 |
|
|
|
| 1959 |
|
|
return result;
|
| 1960 |
|
|
}
|
| 1961 |
|
|
|
| 1962 |
|
|
|
| 1963 |
|
|
/* Free all memory associated with a file. */
|
| 1964 |
|
|
int
|
| 1965 |
|
|
jffs_free_node_list(struct jffs_file *f)
|
| 1966 |
|
|
{
|
| 1967 |
|
|
struct jffs_node *node;
|
| 1968 |
|
|
struct jffs_node *p;
|
| 1969 |
|
|
|
| 1970 |
|
|
D3(printk("jffs_free_node_list(): f #%u, \"%s\"\n",
|
| 1971 |
|
|
f->ino, (f->name ? f->name : "")));
|
| 1972 |
|
|
node = f->version_head;
|
| 1973 |
|
|
while (node) {
|
| 1974 |
|
|
p = node;
|
| 1975 |
|
|
node = node->version_next;
|
| 1976 |
|
|
kfree(p);
|
| 1977 |
|
|
DJM(no_jffs_node--);
|
| 1978 |
|
|
}
|
| 1979 |
|
|
return 0;
|
| 1980 |
|
|
}
|
| 1981 |
|
|
|
| 1982 |
|
|
|
| 1983 |
|
|
/* See if a file is deleted. If so, mark that file's nodes as obsolete. */
|
| 1984 |
|
|
int
|
| 1985 |
|
|
jffs_possibly_delete_file(struct jffs_file *f)
|
| 1986 |
|
|
{
|
| 1987 |
|
|
struct jffs_node *n;
|
| 1988 |
|
|
|
| 1989 |
|
|
D3(printk("jffs_possibly_delete_file(): ino: %u\n",
|
| 1990 |
|
|
f->ino));
|
| 1991 |
|
|
|
| 1992 |
|
|
ASSERT(if (!f) {
|
| 1993 |
|
|
printk(KERN_ERR "jffs_possibly_delete_file(): f == NULL\n");
|
| 1994 |
|
|
return -1;
|
| 1995 |
|
|
});
|
| 1996 |
|
|
|
| 1997 |
|
|
if (f->deleted) {
|
| 1998 |
|
|
/* First try to remove all older versions. */
|
| 1999 |
|
|
for (n = f->version_head; n; n = n->version_next) {
|
| 2000 |
|
|
if (!n->fm) {
|
| 2001 |
|
|
continue;
|
| 2002 |
|
|
}
|
| 2003 |
|
|
if (jffs_fmfree(f->c->fmc, n->fm, n) < 0) {
|
| 2004 |
|
|
break;
|
| 2005 |
|
|
}
|
| 2006 |
|
|
}
|
| 2007 |
|
|
/* Unlink the file from the filesystem. */
|
| 2008 |
|
|
jffs_unlink_file_from_tree(f);
|
| 2009 |
|
|
jffs_unlink_file_from_hash(f);
|
| 2010 |
|
|
jffs_free_node_list(f);
|
| 2011 |
|
|
if (f->name) {
|
| 2012 |
|
|
kfree(f->name);
|
| 2013 |
|
|
DJM(no_name--);
|
| 2014 |
|
|
}
|
| 2015 |
|
|
kfree(f);
|
| 2016 |
|
|
DJM(no_jffs_file--);
|
| 2017 |
|
|
}
|
| 2018 |
|
|
return 0;
|
| 2019 |
|
|
}
|
| 2020 |
|
|
|
| 2021 |
|
|
|
| 2022 |
|
|
/* Used in conjunction with jffs_foreach_file() to count the number
|
| 2023 |
|
|
of files in the file system. */
|
| 2024 |
|
|
int
|
| 2025 |
|
|
jffs_file_count(struct jffs_file *f)
|
| 2026 |
|
|
{
|
| 2027 |
|
|
return 1;
|
| 2028 |
|
|
}
|
| 2029 |
|
|
|
| 2030 |
|
|
|
| 2031 |
|
|
/* Build up a file's range list from scratch by going through the
|
| 2032 |
|
|
version list. */
|
| 2033 |
|
|
int
|
| 2034 |
|
|
jffs_build_file(struct jffs_file *f)
|
| 2035 |
|
|
{
|
| 2036 |
|
|
struct jffs_node *n;
|
| 2037 |
|
|
|
| 2038 |
|
|
D3(printk("jffs_build_file(): ino: %u, name: \"%s\"\n",
|
| 2039 |
|
|
f->ino, (f->name ? f->name : "")));
|
| 2040 |
|
|
|
| 2041 |
|
|
for (n = f->version_head; n; n = n->version_next) {
|
| 2042 |
|
|
jffs_update_file(f, n);
|
| 2043 |
|
|
}
|
| 2044 |
|
|
return 0;
|
| 2045 |
|
|
}
|
| 2046 |
|
|
|
| 2047 |
|
|
|
| 2048 |
|
|
/* Remove an amount of data from a file. If this amount of data is
|
| 2049 |
|
|
zero, that could mean that a node should be split in two parts.
|
| 2050 |
|
|
We remove or change the appropriate nodes in the lists.
|
| 2051 |
|
|
|
| 2052 |
|
|
Starting offset of area to be removed is node->data_offset,
|
| 2053 |
|
|
and the length of the area is in node->removed_size. */
|
| 2054 |
|
|
static void
|
| 2055 |
|
|
jffs_delete_data(struct jffs_file *f, struct jffs_node *node)
|
| 2056 |
|
|
{
|
| 2057 |
|
|
struct jffs_node *n;
|
| 2058 |
|
|
__u32 offset = node->data_offset;
|
| 2059 |
|
|
__u32 remove_size = node->removed_size;
|
| 2060 |
|
|
|
| 2061 |
|
|
D3(printk("jffs_delete_data(): offset = %u, remove_size = %u\n",
|
| 2062 |
|
|
offset, remove_size));
|
| 2063 |
|
|
|
| 2064 |
|
|
if (remove_size == 0
|
| 2065 |
|
|
&& f->range_tail
|
| 2066 |
|
|
&& f->range_tail->data_offset + f->range_tail->data_size
|
| 2067 |
|
|
== offset) {
|
| 2068 |
|
|
/* A simple append; nothing to remove or no node to split. */
|
| 2069 |
|
|
return;
|
| 2070 |
|
|
}
|
| 2071 |
|
|
|
| 2072 |
|
|
/* Find the node where we should begin the removal. */
|
| 2073 |
|
|
for (n = f->range_head; n; n = n->range_next) {
|
| 2074 |
|
|
if (n->data_offset + n->data_size > offset) {
|
| 2075 |
|
|
break;
|
| 2076 |
|
|
}
|
| 2077 |
|
|
}
|
| 2078 |
|
|
if (!n) {
|
| 2079 |
|
|
/* If there's no data in the file there's no data to
|
| 2080 |
|
|
remove either. */
|
| 2081 |
|
|
return;
|
| 2082 |
|
|
}
|
| 2083 |
|
|
|
| 2084 |
|
|
if (n->data_offset > offset) {
|
| 2085 |
|
|
/* XXX: Not implemented yet. */
|
| 2086 |
|
|
printk(KERN_WARNING "JFFS: An unexpected situation "
|
| 2087 |
|
|
"occurred in jffs_delete_data.\n");
|
| 2088 |
|
|
}
|
| 2089 |
|
|
else if (n->data_offset < offset) {
|
| 2090 |
|
|
/* See if the node has to be split into two parts. */
|
| 2091 |
|
|
if (n->data_offset + n->data_size < offset + remove_size) {
|
| 2092 |
|
|
/* Do the split. */
|
| 2093 |
|
|
struct jffs_node *new_node;
|
| 2094 |
|
|
D3(printk("jffs_delete_data(): Split node with "
|
| 2095 |
|
|
"version number %u.\n", n->version));
|
| 2096 |
|
|
|
| 2097 |
|
|
if (!(new_node = (struct jffs_node *)
|
| 2098 |
|
|
kmalloc(sizeof(struct jffs_node),
|
| 2099 |
|
|
GFP_KERNEL))) {
|
| 2100 |
|
|
D(printk("jffs_delete_data(): -ENOMEM\n"));
|
| 2101 |
|
|
return;
|
| 2102 |
|
|
}
|
| 2103 |
|
|
DJM(no_jffs_node++);
|
| 2104 |
|
|
|
| 2105 |
|
|
new_node->ino = n->ino;
|
| 2106 |
|
|
new_node->version = n->version;
|
| 2107 |
|
|
new_node->data_offset = offset;
|
| 2108 |
|
|
new_node->data_size = n->data_size
|
| 2109 |
|
|
- (remove_size
|
| 2110 |
|
|
+ (offset - n->data_offset));
|
| 2111 |
|
|
new_node->fm_offset = n->fm_offset + n->data_size
|
| 2112 |
|
|
+ remove_size;
|
| 2113 |
|
|
new_node->name_size = n->name_size;
|
| 2114 |
|
|
new_node->fm = n->fm;
|
| 2115 |
|
|
new_node->version_prev = n;
|
| 2116 |
|
|
new_node->version_next = n->version_next;
|
| 2117 |
|
|
if (new_node->version_next) {
|
| 2118 |
|
|
new_node->version_next->version_prev
|
| 2119 |
|
|
= new_node;
|
| 2120 |
|
|
}
|
| 2121 |
|
|
else {
|
| 2122 |
|
|
f->version_tail = new_node;
|
| 2123 |
|
|
}
|
| 2124 |
|
|
n->version_next = new_node;
|
| 2125 |
|
|
new_node->range_prev = n;
|
| 2126 |
|
|
new_node->range_next = n->range_next;
|
| 2127 |
|
|
if (new_node->range_next) {
|
| 2128 |
|
|
new_node->range_next->range_prev = new_node;
|
| 2129 |
|
|
}
|
| 2130 |
|
|
else {
|
| 2131 |
|
|
f->range_tail = new_node;
|
| 2132 |
|
|
}
|
| 2133 |
|
|
/* A very interesting can of worms. */
|
| 2134 |
|
|
n->range_next = new_node;
|
| 2135 |
|
|
n->data_size = offset - n->data_offset;
|
| 2136 |
|
|
jffs_add_node(new_node);
|
| 2137 |
|
|
n = new_node->range_next;
|
| 2138 |
|
|
remove_size = 0;
|
| 2139 |
|
|
}
|
| 2140 |
|
|
else {
|
| 2141 |
|
|
/* No. No need to split the node. Just remove
|
| 2142 |
|
|
the end of the node. */
|
| 2143 |
|
|
int r = jffs_min(n->data_offset + n->data_size
|
| 2144 |
|
|
- offset, remove_size);
|
| 2145 |
|
|
n->data_size -= r;
|
| 2146 |
|
|
remove_size -= r;
|
| 2147 |
|
|
n = n->range_next;
|
| 2148 |
|
|
}
|
| 2149 |
|
|
}
|
| 2150 |
|
|
|
| 2151 |
|
|
/* Remove as many nodes as necessary. */
|
| 2152 |
|
|
while (n && remove_size) {
|
| 2153 |
|
|
if (n->data_size <= remove_size) {
|
| 2154 |
|
|
struct jffs_node *p = n;
|
| 2155 |
|
|
remove_size -= n->data_size;
|
| 2156 |
|
|
n = n->range_next;
|
| 2157 |
|
|
D3(printk("jffs_delete_data(): Removing node: "
|
| 2158 |
|
|
"ino: %u, version: %u\n",
|
| 2159 |
|
|
p->ino, p->version));
|
| 2160 |
|
|
if (p->fm) {
|
| 2161 |
|
|
jffs_fmfree(f->c->fmc, p->fm, p);
|
| 2162 |
|
|
}
|
| 2163 |
|
|
jffs_unlink_node_from_range_list(f, p);
|
| 2164 |
|
|
jffs_unlink_node_from_version_list(f, p);
|
| 2165 |
|
|
kfree(p);
|
| 2166 |
|
|
DJM(no_jffs_node--);
|
| 2167 |
|
|
}
|
| 2168 |
|
|
else {
|
| 2169 |
|
|
n->data_size -= remove_size;
|
| 2170 |
|
|
n->fm_offset += remove_size;
|
| 2171 |
|
|
n->data_offset -= (node->removed_size - remove_size);
|
| 2172 |
|
|
n = n->range_next;
|
| 2173 |
|
|
break;
|
| 2174 |
|
|
}
|
| 2175 |
|
|
}
|
| 2176 |
|
|
|
| 2177 |
|
|
/* Adjust the following nodes' information about offsets etc. */
|
| 2178 |
|
|
while (n && node->removed_size) {
|
| 2179 |
|
|
n->data_offset -= node->removed_size;
|
| 2180 |
|
|
n = n->range_next;
|
| 2181 |
|
|
}
|
| 2182 |
|
|
|
| 2183 |
|
|
f->size -= node->removed_size;
|
| 2184 |
|
|
D3(printk("jffs_delete_data(): f->size = %d\n", f->size));
|
| 2185 |
|
|
} /* jffs_delete_data() */
|
| 2186 |
|
|
|
| 2187 |
|
|
|
| 2188 |
|
|
/* Insert some data into a file. Prior to the call to this function,
|
| 2189 |
|
|
jffs_delete_data() should be called. */
|
| 2190 |
|
|
static void
|
| 2191 |
|
|
jffs_insert_data(struct jffs_file *f, struct jffs_node *node)
|
| 2192 |
|
|
{
|
| 2193 |
|
|
D3(printk("jffs_insert_data(): node->data_offset = %u, "
|
| 2194 |
|
|
"node->data_size = %u, f->size = %u\n",
|
| 2195 |
|
|
node->data_offset, node->data_size, f->size));
|
| 2196 |
|
|
|
| 2197 |
|
|
/* Find the position where we should insert data. */
|
| 2198 |
|
|
|
| 2199 |
|
|
if (node->data_offset == f->size) {
|
| 2200 |
|
|
/* A simple append. This is the most common operation. */
|
| 2201 |
|
|
node->range_next = 0;
|
| 2202 |
|
|
node->range_prev = f->range_tail;
|
| 2203 |
|
|
if (node->range_prev) {
|
| 2204 |
|
|
node->range_prev->range_next = node;
|
| 2205 |
|
|
}
|
| 2206 |
|
|
f->range_tail = node;
|
| 2207 |
|
|
f->size += node->data_size;
|
| 2208 |
|
|
if (!f->range_head) {
|
| 2209 |
|
|
f->range_head = node;
|
| 2210 |
|
|
}
|
| 2211 |
|
|
}
|
| 2212 |
|
|
else if (node->data_offset < f->size) {
|
| 2213 |
|
|
/* Trying to insert data into the middle of the file. This
|
| 2214 |
|
|
means no problem because jffs_delete_data() has already
|
| 2215 |
|
|
prepared the range list for us. */
|
| 2216 |
|
|
struct jffs_node *n;
|
| 2217 |
|
|
|
| 2218 |
|
|
/* Find the correct place for the insertion and then insert
|
| 2219 |
|
|
the node. */
|
| 2220 |
|
|
for (n = f->range_head; n; n = n->range_next) {
|
| 2221 |
|
|
D1(printk("Cool stuff's happening!\n"));
|
| 2222 |
|
|
|
| 2223 |
|
|
if (n->data_offset == node->data_offset) {
|
| 2224 |
|
|
node->range_prev = n->range_prev;
|
| 2225 |
|
|
if (node->range_prev) {
|
| 2226 |
|
|
node->range_prev->range_next = node;
|
| 2227 |
|
|
}
|
| 2228 |
|
|
else {
|
| 2229 |
|
|
f->range_head = node;
|
| 2230 |
|
|
}
|
| 2231 |
|
|
node->range_next = n;
|
| 2232 |
|
|
n->range_prev = node;
|
| 2233 |
|
|
break;
|
| 2234 |
|
|
}
|
| 2235 |
|
|
ASSERT(else if (n->data_offset + n->data_size >
|
| 2236 |
|
|
node->data_offset) {
|
| 2237 |
|
|
printk(KERN_ERR "jffs_insert_data(): "
|
| 2238 |
|
|
"Couldn't find a place to insert "
|
| 2239 |
|
|
"the data!\n");
|
| 2240 |
|
|
return;
|
| 2241 |
|
|
});
|
| 2242 |
|
|
}
|
| 2243 |
|
|
|
| 2244 |
|
|
/* Adjust later nodes' offsets etc. */
|
| 2245 |
|
|
n = node->range_next;
|
| 2246 |
|
|
while (n) {
|
| 2247 |
|
|
n->data_offset += node->data_size;
|
| 2248 |
|
|
n = n->range_next;
|
| 2249 |
|
|
}
|
| 2250 |
|
|
f->size += node->data_size;
|
| 2251 |
|
|
}
|
| 2252 |
|
|
else if (node->data_offset > f->size) {
|
| 2253 |
|
|
/* Not implemented yet. */
|
| 2254 |
|
|
#if 0
|
| 2255 |
|
|
/* Below is some example code for future use if we decide
|
| 2256 |
|
|
to implement it. */
|
| 2257 |
|
|
/* This is code that isn't supported by VFS. So there aren't
|
| 2258 |
|
|
really any reasons to implement it yet. */
|
| 2259 |
|
|
if (!f->range_head) {
|
| 2260 |
|
|
if (node->data_offset > f->size) {
|
| 2261 |
|
|
if (!(nn = jffs_alloc_node())) {
|
| 2262 |
|
|
D(printk("jffs_insert_data(): "
|
| 2263 |
|
|
"Allocation failed.\n"));
|
| 2264 |
|
|
return;
|
| 2265 |
|
|
}
|
| 2266 |
|
|
nn->version = JFFS_MAGIC_BITMASK;
|
| 2267 |
|
|
nn->data_offset = 0;
|
| 2268 |
|
|
nn->data_size = node->data_offset;
|
| 2269 |
|
|
nn->removed_size = 0;
|
| 2270 |
|
|
nn->fm_offset = 0;
|
| 2271 |
|
|
nn->name_size = 0;
|
| 2272 |
|
|
nn->fm = 0; /* This is a virtual data holder. */
|
| 2273 |
|
|
nn->version_prev = 0;
|
| 2274 |
|
|
nn->version_next = 0;
|
| 2275 |
|
|
nn->range_prev = 0;
|
| 2276 |
|
|
nn->range_next = 0;
|
| 2277 |
|
|
nh->range_head = nn;
|
| 2278 |
|
|
nh->range_tail = nn;
|
| 2279 |
|
|
}
|
| 2280 |
|
|
}
|
| 2281 |
|
|
#endif
|
| 2282 |
|
|
}
|
| 2283 |
|
|
|
| 2284 |
|
|
D3(printk("jffs_insert_data(): f->size = %d\n", f->size));
|
| 2285 |
|
|
}
|
| 2286 |
|
|
|
| 2287 |
|
|
|
| 2288 |
|
|
/* A new node (with data) has been added to the file and now the range
|
| 2289 |
|
|
list has to be modified. */
|
| 2290 |
|
|
static int
|
| 2291 |
|
|
jffs_update_file(struct jffs_file *f, struct jffs_node *node)
|
| 2292 |
|
|
{
|
| 2293 |
|
|
D3(printk("jffs_update_file(): ino: %u, version: %u\n",
|
| 2294 |
|
|
f->ino, node->version));
|
| 2295 |
|
|
|
| 2296 |
|
|
if (node->data_size == 0) {
|
| 2297 |
|
|
if (node->removed_size == 0) {
|
| 2298 |
|
|
/* data_offset == X */
|
| 2299 |
|
|
/* data_size == 0 */
|
| 2300 |
|
|
/* remove_size == 0 */
|
| 2301 |
|
|
}
|
| 2302 |
|
|
else {
|
| 2303 |
|
|
/* data_offset == X */
|
| 2304 |
|
|
/* data_size == 0 */
|
| 2305 |
|
|
/* remove_size != 0 */
|
| 2306 |
|
|
jffs_delete_data(f, node);
|
| 2307 |
|
|
}
|
| 2308 |
|
|
}
|
| 2309 |
|
|
else {
|
| 2310 |
|
|
/* data_offset == X */
|
| 2311 |
|
|
/* data_size != 0 */
|
| 2312 |
|
|
/* remove_size == Y */
|
| 2313 |
|
|
jffs_delete_data(f, node);
|
| 2314 |
|
|
jffs_insert_data(f, node);
|
| 2315 |
|
|
}
|
| 2316 |
|
|
return 0;
|
| 2317 |
|
|
}
|
| 2318 |
|
|
|
| 2319 |
|
|
|
| 2320 |
|
|
/* Print the contents of a node. */
|
| 2321 |
|
|
void
|
| 2322 |
|
|
jffs_print_node(struct jffs_node *n)
|
| 2323 |
|
|
{
|
| 2324 |
|
|
D(printk("jffs_node: 0x%p\n", n));
|
| 2325 |
|
|
D(printk("{\n"));
|
| 2326 |
|
|
D(printk(" 0x%08x, /* version */\n", n->version));
|
| 2327 |
|
|
D(printk(" 0x%08x, /* data_offset */\n", n->data_offset));
|
| 2328 |
|
|
D(printk(" 0x%08x, /* data_size */\n", n->data_size));
|
| 2329 |
|
|
D(printk(" 0x%08x, /* removed_size */\n", n->removed_size));
|
| 2330 |
|
|
D(printk(" 0x%08x, /* fm_offset */\n", n->fm_offset));
|
| 2331 |
|
|
D(printk(" 0x%02x, /* name_size */\n", n->name_size));
|
| 2332 |
|
|
D(printk(" 0x%p, /* fm, fm->offset: %u */\n",
|
| 2333 |
|
|
n->fm, n->fm->offset));
|
| 2334 |
|
|
D(printk(" 0x%p, /* version_prev */\n", n->version_prev));
|
| 2335 |
|
|
D(printk(" 0x%p, /* version_next */\n", n->version_next));
|
| 2336 |
|
|
D(printk(" 0x%p, /* range_prev */\n", n->range_prev));
|
| 2337 |
|
|
D(printk(" 0x%p, /* range_next */\n", n->range_next));
|
| 2338 |
|
|
D(printk("}\n"));
|
| 2339 |
|
|
}
|
| 2340 |
|
|
|
| 2341 |
|
|
|
| 2342 |
|
|
/* Print the contents of a raw inode. */
|
| 2343 |
|
|
void
|
| 2344 |
|
|
jffs_print_raw_inode(struct jffs_raw_inode *raw_inode)
|
| 2345 |
|
|
{
|
| 2346 |
|
|
D(printk("jffs_raw_inode: inode number: %u\n", raw_inode->ino));
|
| 2347 |
|
|
D(printk("{\n"));
|
| 2348 |
|
|
D(printk(" 0x%08x, /* magic */\n", raw_inode->magic));
|
| 2349 |
|
|
D(printk(" 0x%08x, /* ino */\n", raw_inode->ino));
|
| 2350 |
|
|
D(printk(" 0x%08x, /* pino */\n", raw_inode->pino));
|
| 2351 |
|
|
D(printk(" 0x%08x, /* version */\n", raw_inode->version));
|
| 2352 |
|
|
D(printk(" 0x%08x, /* mode */\n", raw_inode->mode));
|
| 2353 |
|
|
D(printk(" 0x%04x, /* uid */\n", raw_inode->uid));
|
| 2354 |
|
|
D(printk(" 0x%04x, /* gid */\n", raw_inode->gid));
|
| 2355 |
|
|
D(printk(" 0x%08x, /* atime */\n", raw_inode->atime));
|
| 2356 |
|
|
D(printk(" 0x%08x, /* mtime */\n", raw_inode->mtime));
|
| 2357 |
|
|
D(printk(" 0x%08x, /* ctime */\n", raw_inode->ctime));
|
| 2358 |
|
|
D(printk(" 0x%08x, /* offset */\n", raw_inode->offset));
|
| 2359 |
|
|
D(printk(" 0x%08x, /* dsize */\n", raw_inode->dsize));
|
| 2360 |
|
|
D(printk(" 0x%08x, /* rsize */\n", raw_inode->rsize));
|
| 2361 |
|
|
D(printk(" 0x%02x, /* nsize */\n", raw_inode->nsize));
|
| 2362 |
|
|
D(printk(" 0x%02x, /* nlink */\n", raw_inode->nlink));
|
| 2363 |
|
|
D(printk(" 0x%02x, /* spare */\n",
|
| 2364 |
|
|
raw_inode->spare));
|
| 2365 |
|
|
D(printk(" %u, /* rename */\n",
|
| 2366 |
|
|
raw_inode->rename));
|
| 2367 |
|
|
D(printk(" %u, /* deleted */\n",
|
| 2368 |
|
|
raw_inode->deleted));
|
| 2369 |
|
|
D(printk(" 0x%02x, /* accurate */\n",
|
| 2370 |
|
|
raw_inode->accurate));
|
| 2371 |
|
|
D(printk(" 0x%08x, /* dchksum */\n", raw_inode->dchksum));
|
| 2372 |
|
|
D(printk(" 0x%04x, /* nchksum */\n", raw_inode->nchksum));
|
| 2373 |
|
|
D(printk(" 0x%04x, /* chksum */\n", raw_inode->chksum));
|
| 2374 |
|
|
D(printk("}\n"));
|
| 2375 |
|
|
}
|
| 2376 |
|
|
|
| 2377 |
|
|
|
| 2378 |
|
|
/* Print the contents of a file. */
|
| 2379 |
|
|
int
|
| 2380 |
|
|
jffs_print_file(struct jffs_file *f)
|
| 2381 |
|
|
{
|
| 2382 |
|
|
D(int i);
|
| 2383 |
|
|
D(printk("jffs_file: 0x%p\n", f));
|
| 2384 |
|
|
D(printk("{\n"));
|
| 2385 |
|
|
D(printk(" 0x%08x, /* ino */\n", f->ino));
|
| 2386 |
|
|
D(printk(" 0x%08x, /* pino */\n", f->pino));
|
| 2387 |
|
|
D(printk(" 0x%08x, /* mode */\n", f->mode));
|
| 2388 |
|
|
D(printk(" 0x%04x, /* uid */\n", f->uid));
|
| 2389 |
|
|
D(printk(" 0x%04x, /* gid */\n", f->gid));
|
| 2390 |
|
|
D(printk(" 0x%08x, /* atime */\n", f->atime));
|
| 2391 |
|
|
D(printk(" 0x%08x, /* mtime */\n", f->mtime));
|
| 2392 |
|
|
D(printk(" 0x%08x, /* ctime */\n", f->ctime));
|
| 2393 |
|
|
D(printk(" 0x%02x, /* nsize */\n", f->nsize));
|
| 2394 |
|
|
D(printk(" 0x%02x, /* nlink */\n", f->nlink));
|
| 2395 |
|
|
D(printk(" 0x%02x, /* deleted */\n", f->deleted));
|
| 2396 |
|
|
D(printk(" \"%s\", ", (f->name ? f->name : "")));
|
| 2397 |
|
|
D(for (i = strlen(f->name ? f->name : ""); i < 8; ++i) {
|
| 2398 |
|
|
printk(" ");
|
| 2399 |
|
|
});
|
| 2400 |
|
|
D(printk("/* name */\n"));
|
| 2401 |
|
|
D(printk(" 0x%08x, /* size */\n", f->size));
|
| 2402 |
|
|
D(printk(" 0x%08x, /* highest_version */\n",
|
| 2403 |
|
|
f->highest_version));
|
| 2404 |
|
|
D(printk(" 0x%p, /* c */\n", f->c));
|
| 2405 |
|
|
D(printk(" 0x%p, /* parent */\n", f->parent));
|
| 2406 |
|
|
D(printk(" 0x%p, /* children */\n", f->children));
|
| 2407 |
|
|
D(printk(" 0x%p, /* sibling_prev */\n", f->sibling_prev));
|
| 2408 |
|
|
D(printk(" 0x%p, /* sibling_next */\n", f->sibling_next));
|
| 2409 |
|
|
D(printk(" 0x%p, /* hash_prev */\n", f->hash_prev));
|
| 2410 |
|
|
D(printk(" 0x%p, /* hash_next */\n", f->hash_next));
|
| 2411 |
|
|
D(printk(" 0x%p, /* range_head */\n", f->range_head));
|
| 2412 |
|
|
D(printk(" 0x%p, /* range_tail */\n", f->range_tail));
|
| 2413 |
|
|
D(printk(" 0x%p, /* version_head */\n", f->version_head));
|
| 2414 |
|
|
D(printk(" 0x%p, /* version_tail */\n", f->version_tail));
|
| 2415 |
|
|
D(printk("}\n"));
|
| 2416 |
|
|
return 0;
|
| 2417 |
|
|
}
|
| 2418 |
|
|
|
| 2419 |
|
|
|
| 2420 |
|
|
void
|
| 2421 |
|
|
jffs_print_hash_table(struct jffs_control *c)
|
| 2422 |
|
|
{
|
| 2423 |
|
|
struct jffs_file *f;
|
| 2424 |
|
|
int i;
|
| 2425 |
|
|
|
| 2426 |
|
|
printk("JFFS: Dumping the file system's hash table...\n");
|
| 2427 |
|
|
for (i = 0; i < c->hash_len; i++) {
|
| 2428 |
|
|
for (f = c->hash[i]; f; f = f->hash_next) {
|
| 2429 |
|
|
printk("*** c->hash[%u]: \"%s\" "
|
| 2430 |
|
|
"(ino: %u, pino: %u)\n",
|
| 2431 |
|
|
i, (f->name ? f->name : ""),
|
| 2432 |
|
|
f->ino, f->pino);
|
| 2433 |
|
|
}
|
| 2434 |
|
|
}
|
| 2435 |
|
|
}
|
| 2436 |
|
|
|
| 2437 |
|
|
|
| 2438 |
|
|
void
|
| 2439 |
|
|
jffs_print_tree(struct jffs_file *first_file, int indent)
|
| 2440 |
|
|
{
|
| 2441 |
|
|
struct jffs_file *f;
|
| 2442 |
|
|
char *space;
|
| 2443 |
|
|
|
| 2444 |
|
|
if (!first_file) {
|
| 2445 |
|
|
return;
|
| 2446 |
|
|
}
|
| 2447 |
|
|
|
| 2448 |
|
|
if (!(space = (char *) kmalloc(indent + 1, GFP_KERNEL))) {
|
| 2449 |
|
|
printk("jffs_print_tree(): Out of memory!\n");
|
| 2450 |
|
|
return;
|
| 2451 |
|
|
}
|
| 2452 |
|
|
|
| 2453 |
|
|
memset(space, ' ', indent);
|
| 2454 |
|
|
space[indent] = '\0';
|
| 2455 |
|
|
|
| 2456 |
|
|
for (f = first_file; f; f = f->sibling_next) {
|
| 2457 |
|
|
printk("%s%s (ino: %u, highest_version: %u, size: %u)\n",
|
| 2458 |
|
|
space, (f->name ? f->name : "/"),
|
| 2459 |
|
|
f->ino, f->highest_version, f->size);
|
| 2460 |
|
|
if (S_ISDIR(f->mode)) {
|
| 2461 |
|
|
jffs_print_tree(f->children, indent + 2);
|
| 2462 |
|
|
}
|
| 2463 |
|
|
}
|
| 2464 |
|
|
|
| 2465 |
|
|
kfree(space);
|
| 2466 |
|
|
}
|
| 2467 |
|
|
|
| 2468 |
|
|
|
| 2469 |
|
|
#if defined(JFFS_MEMORY_DEBUG) && JFFS_MEMORY_DEBUG
|
| 2470 |
|
|
void
|
| 2471 |
|
|
jffs_print_memory_allocation_statistics(void)
|
| 2472 |
|
|
{
|
| 2473 |
|
|
static long printout = 0;
|
| 2474 |
|
|
printk("________ Memory printout #%ld ________\n", ++printout);
|
| 2475 |
|
|
printk("no_jffs_file = %ld\n", no_jffs_file);
|
| 2476 |
|
|
printk("no_jffs_node = %ld\n", no_jffs_node);
|
| 2477 |
|
|
printk("no_jffs_control = %ld\n", no_jffs_control);
|
| 2478 |
|
|
printk("no_jffs_raw_inode = %ld\n", no_jffs_raw_inode);
|
| 2479 |
|
|
printk("no_jffs_node_ref = %ld\n", no_jffs_node_ref);
|
| 2480 |
|
|
printk("no_jffs_fm = %ld\n", no_jffs_fm);
|
| 2481 |
|
|
printk("no_jffs_fmcontrol = %ld\n", no_jffs_fmcontrol);
|
| 2482 |
|
|
printk("no_hash = %ld\n", no_hash);
|
| 2483 |
|
|
printk("no_name = %ld\n", no_name);
|
| 2484 |
|
|
printk("\n");
|
| 2485 |
|
|
}
|
| 2486 |
|
|
#endif
|
| 2487 |
|
|
|
| 2488 |
|
|
|
| 2489 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 2490 |
|
|
|
| 2491 |
|
|
/* Rewrite `size' bytes, and begin at `node'. */
|
| 2492 |
|
|
int
|
| 2493 |
|
|
jffs_rewrite_data(struct jffs_file *f, struct jffs_node *node, int size)
|
| 2494 |
|
|
{
|
| 2495 |
|
|
struct jffs_control *c = f->c;
|
| 2496 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 2497 |
|
|
struct jffs_raw_inode raw_inode;
|
| 2498 |
|
|
struct jffs_node *new_node;
|
| 2499 |
|
|
struct jffs_fm *fm;
|
| 2500 |
|
|
unsigned char *pos;
|
| 2501 |
|
|
unsigned char *pos_dchksum;
|
| 2502 |
|
|
__u32 total_name_size;
|
| 2503 |
|
|
__u32 total_data_size;
|
| 2504 |
|
|
__u32 total_size;
|
| 2505 |
|
|
int err;
|
| 2506 |
|
|
|
| 2507 |
|
|
D1(printk("***jffs_rewrite_data(): node: %u, name: \"%s\", size: %u\n",
|
| 2508 |
|
|
f->ino, (f->name ? f->name : ""), size));
|
| 2509 |
|
|
|
| 2510 |
|
|
/* Create and initialize the new node. */
|
| 2511 |
|
|
if (!(new_node = (struct jffs_node *)
|
| 2512 |
|
|
kmalloc(sizeof(struct jffs_node), GFP_KERNEL))) {
|
| 2513 |
|
|
D(printk("jffs_rewrite_data(): "
|
| 2514 |
|
|
"Failed to allocate node.\n"));
|
| 2515 |
|
|
return -ENOMEM;
|
| 2516 |
|
|
}
|
| 2517 |
|
|
DJM(no_jffs_node++);
|
| 2518 |
|
|
new_node->data_offset = node->data_offset;
|
| 2519 |
|
|
new_node->data_size = size;
|
| 2520 |
|
|
new_node->removed_size = size;
|
| 2521 |
|
|
total_name_size = f->nsize + JFFS_GET_PAD_BYTES(f->nsize);
|
| 2522 |
|
|
total_data_size = size + JFFS_GET_PAD_BYTES(size);
|
| 2523 |
|
|
total_size = sizeof(struct jffs_raw_inode)
|
| 2524 |
|
|
+ total_name_size + total_data_size;
|
| 2525 |
|
|
new_node->fm_offset = sizeof(struct jffs_raw_inode)
|
| 2526 |
|
|
+ total_name_size;
|
| 2527 |
|
|
|
| 2528 |
|
|
if ((err = jffs_fmalloc(fmc, total_size, new_node, &fm)) < 0) {
|
| 2529 |
|
|
D(printk("jffs_rewrite_data(): Failed to allocate fm.\n"));
|
| 2530 |
|
|
kfree(new_node);
|
| 2531 |
|
|
DJM(no_jffs_node--);
|
| 2532 |
|
|
return err;
|
| 2533 |
|
|
}
|
| 2534 |
|
|
else if (!fm->nodes) {
|
| 2535 |
|
|
/* The jffs_fm struct that we got is not good enough. */
|
| 2536 |
|
|
if ((err = jffs_write_dummy_node(c, fm)) < 0) {
|
| 2537 |
|
|
D(printk("jffs_rewrite_data(): "
|
| 2538 |
|
|
"jffs_write_dummy_node() Failed!\n"));
|
| 2539 |
|
|
kfree(fm);
|
| 2540 |
|
|
DJM(no_jffs_fm--);
|
| 2541 |
|
|
return err;
|
| 2542 |
|
|
}
|
| 2543 |
|
|
/* Get a new one. */
|
| 2544 |
|
|
if ((err = jffs_fmalloc(fmc, total_size, node, &fm)) < 0) {
|
| 2545 |
|
|
D(printk("jffs_rewrite_data(): Second "
|
| 2546 |
|
|
"jffs_fmalloc(0x%p, %u) failed!\n",
|
| 2547 |
|
|
fmc, total_size));
|
| 2548 |
|
|
return err;
|
| 2549 |
|
|
}
|
| 2550 |
|
|
}
|
| 2551 |
|
|
new_node->fm = fm;
|
| 2552 |
|
|
|
| 2553 |
|
|
ASSERT(if (new_node->fm->nodes == 0) {
|
| 2554 |
|
|
printk(KERN_ERR "jffs_rewrite_data(): "
|
| 2555 |
|
|
"new_node->fm->nodes == 0\n");
|
| 2556 |
|
|
});
|
| 2557 |
|
|
|
| 2558 |
|
|
/* Initialize the raw inode. */
|
| 2559 |
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
| 2560 |
|
|
raw_inode.ino = f->ino;
|
| 2561 |
|
|
raw_inode.pino = f->pino;
|
| 2562 |
|
|
raw_inode.version = f->highest_version + 1;
|
| 2563 |
|
|
raw_inode.mode = f->mode;
|
| 2564 |
|
|
raw_inode.uid = f->uid;
|
| 2565 |
|
|
raw_inode.gid = f->gid;
|
| 2566 |
|
|
raw_inode.atime = f->atime;
|
| 2567 |
|
|
raw_inode.mtime = f->mtime;
|
| 2568 |
|
|
raw_inode.ctime = f->ctime;
|
| 2569 |
|
|
raw_inode.offset = node->data_offset;
|
| 2570 |
|
|
raw_inode.dsize = size;
|
| 2571 |
|
|
raw_inode.rsize = size;
|
| 2572 |
|
|
raw_inode.nsize = f->nsize;
|
| 2573 |
|
|
raw_inode.nlink = f->nlink;
|
| 2574 |
|
|
raw_inode.spare = 0;
|
| 2575 |
|
|
raw_inode.rename = 0;
|
| 2576 |
|
|
raw_inode.deleted = 0;
|
| 2577 |
|
|
raw_inode.accurate = 0xff;
|
| 2578 |
|
|
raw_inode.dchksum = 0;
|
| 2579 |
|
|
raw_inode.nchksum = 0;
|
| 2580 |
|
|
|
| 2581 |
|
|
pos = (unsigned char *) new_node->fm->offset;
|
| 2582 |
|
|
pos_dchksum = &pos[JFFS_RAW_INODE_DCHKSUM_OFFSET];
|
| 2583 |
|
|
|
| 2584 |
|
|
D3(printk("jffs_rewrite_data(): Writing this raw inode "
|
| 2585 |
|
|
"to pos 0x%p.\n", pos));
|
| 2586 |
|
|
D3(jffs_print_raw_inode(&raw_inode));
|
| 2587 |
|
|
|
| 2588 |
|
|
if ((err = flash_safe_write(fmc->flash_part, pos,
|
| 2589 |
|
|
(unsigned char *) &raw_inode,
|
| 2590 |
|
|
sizeof(struct jffs_raw_inode)
|
| 2591 |
|
|
- sizeof(__u32)
|
| 2592 |
|
|
- sizeof(__u16) - sizeof(__u16))) < 0) {
|
| 2593 |
|
|
D(printk(KERN_WARNING "JFFS: Write error during "
|
| 2594 |
|
|
"rewrite. (raw inode)\n"));
|
| 2595 |
|
|
jffs_fmfree_partly(fmc, fm,
|
| 2596 |
|
|
total_name_size + total_data_size);
|
| 2597 |
|
|
return err;
|
| 2598 |
|
|
}
|
| 2599 |
|
|
pos += sizeof(struct jffs_raw_inode);
|
| 2600 |
|
|
|
| 2601 |
|
|
/* Write the name to the flash memory. */
|
| 2602 |
|
|
if (f->nsize) {
|
| 2603 |
|
|
D3(printk("jffs_rewrite_data(): Writing name \"%s\" to "
|
| 2604 |
|
|
"pos 0x%p.\n", f->name, pos));
|
| 2605 |
|
|
if ((err = flash_safe_write(fmc->flash_part, pos,
|
| 2606 |
|
|
(unsigned char *)f->name,
|
| 2607 |
|
|
f->nsize)) < 0) {
|
| 2608 |
|
|
|
| 2609 |
|
|
D(printk(KERN_WARNING "JFFS: Write error during "
|
| 2610 |
|
|
"rewrite. (name)\n"));
|
| 2611 |
|
|
jffs_fmfree_partly(fmc, fm, total_data_size);
|
| 2612 |
|
|
return err;
|
| 2613 |
|
|
}
|
| 2614 |
|
|
pos += total_name_size;
|
| 2615 |
|
|
raw_inode.nchksum = jffs_checksum(f->name, f->nsize);
|
| 2616 |
|
|
}
|
| 2617 |
|
|
|
| 2618 |
|
|
/* Write the data. */
|
| 2619 |
|
|
if (size) {
|
| 2620 |
|
|
int r;
|
| 2621 |
|
|
unsigned char *page;
|
| 2622 |
|
|
__u32 offset = node->data_offset;
|
| 2623 |
|
|
|
| 2624 |
|
|
if (!(page = (unsigned char *)__get_free_page(GFP_KERNEL))) {
|
| 2625 |
|
|
jffs_fmfree_partly(fmc, fm, 0);
|
| 2626 |
|
|
return -1;
|
| 2627 |
|
|
}
|
| 2628 |
|
|
|
| 2629 |
|
|
while (size) {
|
| 2630 |
|
|
__u32 s = jffs_min(size, PAGE_SIZE);
|
| 2631 |
|
|
if ((r = jffs_read_data(f, (char *)page,
|
| 2632 |
|
|
offset, s)) < s) {
|
| 2633 |
|
|
D(printk("jffs_rewrite_data(): "
|
| 2634 |
|
|
"jffs_read_data() "
|
| 2635 |
|
|
"failed! (r = %d)\n", r));
|
| 2636 |
|
|
jffs_fmfree_partly(fmc, fm, 0);
|
| 2637 |
|
|
return -1;
|
| 2638 |
|
|
}
|
| 2639 |
|
|
if ((err = flash_safe_write(fmc->flash_part,
|
| 2640 |
|
|
pos, page, r)) < 0) {
|
| 2641 |
|
|
D(printk(KERN_WARNING "JFFS: Write error "
|
| 2642 |
|
|
"during rewrite. (data)\n"));
|
| 2643 |
|
|
free_page((__u32)page);
|
| 2644 |
|
|
jffs_fmfree_partly(fmc, fm, 0);
|
| 2645 |
|
|
return err;
|
| 2646 |
|
|
}
|
| 2647 |
|
|
pos += r;
|
| 2648 |
|
|
size -= r;
|
| 2649 |
|
|
offset += r;
|
| 2650 |
|
|
raw_inode.dchksum += jffs_checksum(page, r);
|
| 2651 |
|
|
}
|
| 2652 |
|
|
|
| 2653 |
|
|
free_page((__u32)page);
|
| 2654 |
|
|
}
|
| 2655 |
|
|
|
| 2656 |
|
|
raw_inode.accurate = 0;
|
| 2657 |
|
|
raw_inode.chksum = jffs_checksum(&raw_inode,
|
| 2658 |
|
|
sizeof(struct jffs_raw_inode)
|
| 2659 |
|
|
- sizeof(__u16));
|
| 2660 |
|
|
|
| 2661 |
|
|
/* Add the checksum. */
|
| 2662 |
|
|
if ((err
|
| 2663 |
|
|
= flash_safe_write(fmc->flash_part, pos_dchksum,
|
| 2664 |
|
|
&((unsigned char *)
|
| 2665 |
|
|
&raw_inode)[JFFS_RAW_INODE_DCHKSUM_OFFSET],
|
| 2666 |
|
|
sizeof(__u32) + sizeof(__u16)
|
| 2667 |
|
|
+ sizeof(__u16))) < 0) {
|
| 2668 |
|
|
D(printk(KERN_WARNING "JFFS: Write error during "
|
| 2669 |
|
|
"rewrite. (checksum)\n"));
|
| 2670 |
|
|
jffs_fmfree_partly(fmc, fm, 0);
|
| 2671 |
|
|
return err;
|
| 2672 |
|
|
}
|
| 2673 |
|
|
|
| 2674 |
|
|
/* Now make the file system aware of the newly written node. */
|
| 2675 |
|
|
jffs_insert_node(c, f, &raw_inode, f->name, new_node);
|
| 2676 |
|
|
|
| 2677 |
|
|
D3(printk("jffs_rewrite_data(): Leaving...\n"));
|
| 2678 |
|
|
return 0;
|
| 2679 |
|
|
} /* jffs_rewrite_data() */
|
| 2680 |
|
|
|
| 2681 |
|
|
#else
|
| 2682 |
|
|
|
| 2683 |
|
|
/* Rewrite `size' bytes, and begin at `node'. */
|
| 2684 |
|
|
int
|
| 2685 |
|
|
jffs_rewrite_data(struct jffs_file *f, struct jffs_node *node, int size)
|
| 2686 |
|
|
{
|
| 2687 |
|
|
struct jffs_raw_inode raw_inode;
|
| 2688 |
|
|
struct jffs_node *new_node;
|
| 2689 |
|
|
struct jffs_fm *fm;
|
| 2690 |
|
|
struct buffer_head *bh;
|
| 2691 |
|
|
__u32 chksum;
|
| 2692 |
|
|
__u32 write_size;
|
| 2693 |
|
|
__u32 block_offset;
|
| 2694 |
|
|
__u32 block;
|
| 2695 |
|
|
__u32 copied_data = 0;
|
| 2696 |
|
|
__u32 pos_chksum;
|
| 2697 |
|
|
__u32 block_chksum;
|
| 2698 |
|
|
__u32 total_size;
|
| 2699 |
|
|
kdev_t dev = f->c->sb->s_dev;
|
| 2700 |
|
|
int err;
|
| 2701 |
|
|
|
| 2702 |
|
|
D(printk("jffs_rewrite_data(): node: %u, name: \"%s\", size: %u\n",
|
| 2703 |
|
|
f->ino, (f->name ? f->name : ""), size));
|
| 2704 |
|
|
|
| 2705 |
|
|
/* Create and initialize the new node. */
|
| 2706 |
|
|
if (!(new_node = (struct jffs_node *)
|
| 2707 |
|
|
kmalloc(sizeof(struct jffs_node), GFP_KERNEL))) {
|
| 2708 |
|
|
D(printk("jffs_rewrite_data(): "
|
| 2709 |
|
|
"Failed to allocate node.\n"));
|
| 2710 |
|
|
return -ENOMEM;
|
| 2711 |
|
|
}
|
| 2712 |
|
|
DJM(no_jffs_node++);
|
| 2713 |
|
|
new_node->data_offset = node->data_offset;
|
| 2714 |
|
|
new_node->data_size = size;
|
| 2715 |
|
|
new_node->removed_size = size;
|
| 2716 |
|
|
total_size = sizeof(struct jffs_raw_inode)
|
| 2717 |
|
|
+ f->nsize + JFFS_GET_PAD_BYTES(f->nsize)
|
| 2718 |
|
|
+ size + JFFS_GET_PAD_BYTES(size);
|
| 2719 |
|
|
new_node->fm_offset = sizeof(struct jffs_raw_inode)
|
| 2720 |
|
|
+ f->nsize + JFFS_GET_PAD_BYTES(f->nsize);
|
| 2721 |
|
|
|
| 2722 |
|
|
if ((err = jffs_fmalloc(f->c->fmc, total_size, new_node, &fm)) < 0) {
|
| 2723 |
|
|
D(printk("jffs_rewrite_data(): Failed to allocate fm.\n"));
|
| 2724 |
|
|
kfree(new_node);
|
| 2725 |
|
|
DJM(no_jffs_node--);
|
| 2726 |
|
|
return err;
|
| 2727 |
|
|
}
|
| 2728 |
|
|
else if (!fm->nodes) {
|
| 2729 |
|
|
/* The jffs_fm struct that we got is not good enough. */
|
| 2730 |
|
|
if ((err = jffs_write_dummy_node(f->c, fm)) < 0) {
|
| 2731 |
|
|
D(printk("jffs_rewrite_data(): "
|
| 2732 |
|
|
"jffs_write_dummy_node() Failed!\n"));
|
| 2733 |
|
|
kfree(fm);
|
| 2734 |
|
|
DJM(no_jffs_fm--);
|
| 2735 |
|
|
return err;
|
| 2736 |
|
|
}
|
| 2737 |
|
|
/* Get a new one. */
|
| 2738 |
|
|
if ((err = jffs_fmalloc(f->c->fmc, total_size, node, &fm)) < 0) {
|
| 2739 |
|
|
D(printk("jffs_rewrite_data(): Second "
|
| 2740 |
|
|
"jffs_fmalloc(0x%08x, %u) failed!\n",
|
| 2741 |
|
|
f->c->fmc, total_size));
|
| 2742 |
|
|
return err;
|
| 2743 |
|
|
}
|
| 2744 |
|
|
}
|
| 2745 |
|
|
new_node->fm = fm;
|
| 2746 |
|
|
|
| 2747 |
|
|
ASSERT(if (new_node->fm->nodes == 0) {
|
| 2748 |
|
|
printk(KERN_ERR "jffs_rewrite_data(): "
|
| 2749 |
|
|
"new_node->fm->nodes == 0\n");
|
| 2750 |
|
|
});
|
| 2751 |
|
|
|
| 2752 |
|
|
/* Initialize the raw inode. */
|
| 2753 |
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
| 2754 |
|
|
raw_inode.ino = f->ino;
|
| 2755 |
|
|
raw_inode.pino = f->pino;
|
| 2756 |
|
|
raw_inode.version = f->highest_version + 1;
|
| 2757 |
|
|
raw_inode.mode = f->mode;
|
| 2758 |
|
|
raw_inode.uid = f->uid;
|
| 2759 |
|
|
raw_inode.gid = f->gid;
|
| 2760 |
|
|
raw_inode.atime = f->atime;
|
| 2761 |
|
|
raw_inode.mtime = f->mtime;
|
| 2762 |
|
|
raw_inode.ctime = f->ctime;
|
| 2763 |
|
|
raw_inode.offset = node->data_offset;
|
| 2764 |
|
|
raw_inode.dsize = size;
|
| 2765 |
|
|
raw_inode.rsize = size;
|
| 2766 |
|
|
raw_inode.nsize = f->nsize;
|
| 2767 |
|
|
raw_inode.nlink = f->nlink;
|
| 2768 |
|
|
raw_inode.deleted = 0;
|
| 2769 |
|
|
raw_inode.accurate = 0;
|
| 2770 |
|
|
raw_inode.chksum = 0;
|
| 2771 |
|
|
chksum = jffs_checksum(&raw_inode, sizeof(struct jffs_raw_inode));
|
| 2772 |
|
|
raw_inode.accurate = 0xff;
|
| 2773 |
|
|
raw_inode.chksum = JFFS_EMPTY_BITMASK;
|
| 2774 |
|
|
|
| 2775 |
|
|
/* Retrieve the first block to which the new node is going
|
| 2776 |
|
|
to be written. */
|
| 2777 |
|
|
block = new_node->fm->offset / BLOCK_SIZE;
|
| 2778 |
|
|
block_offset = new_node->fm->offset - block * BLOCK_SIZE;
|
| 2779 |
|
|
|
| 2780 |
|
|
D(printk("jffs_rewrite_data(): Writing to dev = 0x%04x, block = %u, "
|
| 2781 |
|
|
"block_offset = %u, block * BLOCK_SIZE + offset = %u\n",
|
| 2782 |
|
|
dev, block, block_offset, new_node->fm->offset));
|
| 2783 |
|
|
|
| 2784 |
|
|
if (!(bh = jffs_get_write_buffer(dev, block))) {
|
| 2785 |
|
|
D(printk("jffs_rewrite_data(): Failed to read block.\n"));
|
| 2786 |
|
|
kfree(new_node->fm);
|
| 2787 |
|
|
DJM(no_jffs_fm--);
|
| 2788 |
|
|
kfree(new_node);
|
| 2789 |
|
|
DJM(no_jffs_node--);
|
| 2790 |
|
|
return -1;
|
| 2791 |
|
|
}
|
| 2792 |
|
|
|
| 2793 |
|
|
/* Write the raw_inode to the flash. */
|
| 2794 |
|
|
if (BLOCK_SIZE - block_offset < sizeof(struct jffs_raw_inode)) {
|
| 2795 |
|
|
/* Too little space left on this block. */
|
| 2796 |
|
|
write_size = BLOCK_SIZE - block_offset;
|
| 2797 |
|
|
memcpy(&bh->b_data[block_offset], &raw_inode, write_size);
|
| 2798 |
|
|
jffs_put_write_buffer(bh);
|
| 2799 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 2800 |
|
|
memcpy(bh->b_data, (void *)&raw_inode + write_size,
|
| 2801 |
|
|
sizeof(struct jffs_raw_inode) - write_size);
|
| 2802 |
|
|
block_offset = sizeof(struct jffs_raw_inode) - write_size;
|
| 2803 |
|
|
pos_chksum = (block_offset - 4);
|
| 2804 |
|
|
block_chksum = block;
|
| 2805 |
|
|
}
|
| 2806 |
|
|
else {
|
| 2807 |
|
|
memcpy(&bh->b_data[block_offset], &raw_inode,
|
| 2808 |
|
|
sizeof(struct jffs_raw_inode));
|
| 2809 |
|
|
block_offset += sizeof(struct jffs_raw_inode);
|
| 2810 |
|
|
pos_chksum = (block_offset - 4);
|
| 2811 |
|
|
block_chksum = block;
|
| 2812 |
|
|
if (block_offset == BLOCK_SIZE) {
|
| 2813 |
|
|
jffs_put_write_buffer(bh);
|
| 2814 |
|
|
bh = 0;
|
| 2815 |
|
|
block_offset = 0;
|
| 2816 |
|
|
}
|
| 2817 |
|
|
}
|
| 2818 |
|
|
|
| 2819 |
|
|
if (!bh && (f->nsize || size)) {
|
| 2820 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 2821 |
|
|
}
|
| 2822 |
|
|
|
| 2823 |
|
|
/* Write the name to the flash memory. */
|
| 2824 |
|
|
if (f->nsize) {
|
| 2825 |
|
|
if (BLOCK_SIZE - block_offset < f->nsize) {
|
| 2826 |
|
|
write_size = BLOCK_SIZE - block_offset;
|
| 2827 |
|
|
memcpy(&bh->b_data[block_offset], f->name, write_size);
|
| 2828 |
|
|
jffs_put_write_buffer(bh);
|
| 2829 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 2830 |
|
|
memcpy(bh->b_data, &f->name[write_size],
|
| 2831 |
|
|
f->nsize - write_size);
|
| 2832 |
|
|
block_offset = f->nsize - write_size;
|
| 2833 |
|
|
}
|
| 2834 |
|
|
else {
|
| 2835 |
|
|
memcpy(&bh->b_data[block_offset], f->name, f->nsize);
|
| 2836 |
|
|
block_offset += f->nsize;
|
| 2837 |
|
|
if (block_offset == BLOCK_SIZE) {
|
| 2838 |
|
|
jffs_put_write_buffer(bh);
|
| 2839 |
|
|
bh = 0;
|
| 2840 |
|
|
block_offset = 0;
|
| 2841 |
|
|
}
|
| 2842 |
|
|
}
|
| 2843 |
|
|
block_offset += JFFS_GET_PAD_BYTES(block_offset);
|
| 2844 |
|
|
chksum += jffs_checksum(f->name, f->nsize);
|
| 2845 |
|
|
}
|
| 2846 |
|
|
|
| 2847 |
|
|
if (!bh && size) {
|
| 2848 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 2849 |
|
|
}
|
| 2850 |
|
|
|
| 2851 |
|
|
/* Write the data. */
|
| 2852 |
|
|
while (copied_data < size) {
|
| 2853 |
|
|
int r;
|
| 2854 |
|
|
D(printk("jffs_rewrite_data(): copied_data = %u, "
|
| 2855 |
|
|
"block_offset = %u\n",
|
| 2856 |
|
|
copied_data, block_offset));
|
| 2857 |
|
|
if (block_offset == BLOCK_SIZE) {
|
| 2858 |
|
|
jffs_put_write_buffer(bh);
|
| 2859 |
|
|
bh = jffs_get_write_buffer(dev, ++block);
|
| 2860 |
|
|
block_offset = 0;
|
| 2861 |
|
|
}
|
| 2862 |
|
|
write_size = jffs_min(size - copied_data,
|
| 2863 |
|
|
BLOCK_SIZE - block_offset);
|
| 2864 |
|
|
if ((r = jffs_read_data(f, &bh->b_data[block_offset], copied_data,
|
| 2865 |
|
|
write_size)) < write_size) {
|
| 2866 |
|
|
D(printk("jffs_rewrite_data(): jffs_read_data() "
|
| 2867 |
|
|
"failed! (r = %d)\n", r));
|
| 2868 |
|
|
brelse(bh);
|
| 2869 |
|
|
return -1;
|
| 2870 |
|
|
}
|
| 2871 |
|
|
chksum += jffs_checksum(&bh->b_data[block_offset], write_size);
|
| 2872 |
|
|
block_offset += r;
|
| 2873 |
|
|
copied_data += r;
|
| 2874 |
|
|
}
|
| 2875 |
|
|
|
| 2876 |
|
|
if (bh) {
|
| 2877 |
|
|
jffs_put_write_buffer(bh);
|
| 2878 |
|
|
}
|
| 2879 |
|
|
|
| 2880 |
|
|
/* Add the checksum. */
|
| 2881 |
|
|
if (!(bh = jffs_get_write_buffer(dev, block_chksum))) {
|
| 2882 |
|
|
D(printk("jffs_rewrite_data(): Failed to read "
|
| 2883 |
|
|
"chksum block. (%u)\n", block_chksum));
|
| 2884 |
|
|
return -1;
|
| 2885 |
|
|
}
|
| 2886 |
|
|
*(__u32 *)&bh->b_data[pos_chksum] = chksum;
|
| 2887 |
|
|
jffs_put_write_buffer(bh);
|
| 2888 |
|
|
D(printk("jffs_rewrite_data(): Added chksum 0x%08x.\n", chksum));
|
| 2889 |
|
|
|
| 2890 |
|
|
/* Now make the file system aware of the newly written node. */
|
| 2891 |
|
|
jffs_insert_node(f->c, f, &raw_inode, 0, new_node);
|
| 2892 |
|
|
|
| 2893 |
|
|
D(printk("jffs_rewrite_data(): Leaving...\n"));
|
| 2894 |
|
|
return 0;
|
| 2895 |
|
|
} /* jffs_rewrite_data() */
|
| 2896 |
|
|
|
| 2897 |
|
|
#endif
|
| 2898 |
|
|
|
| 2899 |
|
|
|
| 2900 |
|
|
int
|
| 2901 |
|
|
jffs_garbage_collect_next(struct jffs_control *c)
|
| 2902 |
|
|
{
|
| 2903 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 2904 |
|
|
struct jffs_node *node;
|
| 2905 |
|
|
struct jffs_file *f;
|
| 2906 |
|
|
int size;
|
| 2907 |
|
|
int free_size = fmc->flash_size - (fmc->used_size + fmc->dirty_size);
|
| 2908 |
|
|
__u32 free_chunk_size1 = jffs_free_size1(fmc);
|
| 2909 |
|
|
D2(__u32 free_chunk_size2 = jffs_free_size2(fmc));
|
| 2910 |
|
|
|
| 2911 |
|
|
/* Get the oldest node in the flash. */
|
| 2912 |
|
|
node = jffs_get_oldest_node(fmc);
|
| 2913 |
|
|
ASSERT(if (!node) {
|
| 2914 |
|
|
printk(KERN_ERR "JFFS: No oldest node!\n");
|
| 2915 |
|
|
return -1;
|
| 2916 |
|
|
});
|
| 2917 |
|
|
|
| 2918 |
|
|
/* Find its corresponding file too. */
|
| 2919 |
|
|
f = jffs_find_file(c, node->ino);
|
| 2920 |
|
|
ASSERT(if (!f) {
|
| 2921 |
|
|
printk(KERN_ERR "JFFS: No file to garbage collect! "
|
| 2922 |
|
|
"ino = 0x%08x\n", node->ino);
|
| 2923 |
|
|
return -1;
|
| 2924 |
|
|
});
|
| 2925 |
|
|
|
| 2926 |
|
|
D1(printk("jffs_garbage_collect_next(): \"%s\", "
|
| 2927 |
|
|
"ino: %u, version: %u\n",
|
| 2928 |
|
|
(f->name ? f->name : ""), node->ino, node->version));
|
| 2929 |
|
|
|
| 2930 |
|
|
/* Compute how much we want to rewrite at the moment. */
|
| 2931 |
|
|
size = sizeof(struct jffs_raw_inode) + f->nsize
|
| 2932 |
|
|
+ f->size - node->data_offset;
|
| 2933 |
|
|
D2(printk(" size: %u\n", size));
|
| 2934 |
|
|
D2(printk(" f->nsize: %u\n", f->nsize));
|
| 2935 |
|
|
D2(printk(" f->size: %u\n", f->size));
|
| 2936 |
|
|
D2(printk(" free_chunk_size1: %u\n", free_chunk_size1));
|
| 2937 |
|
|
D2(printk(" free_chunk_size2: %u\n", free_chunk_size2));
|
| 2938 |
|
|
if (size > fmc->max_chunk_size) {
|
| 2939 |
|
|
size = fmc->max_chunk_size;
|
| 2940 |
|
|
}
|
| 2941 |
|
|
if (size > free_chunk_size1) {
|
| 2942 |
|
|
|
| 2943 |
|
|
if (free_chunk_size1 <
|
| 2944 |
|
|
(sizeof(struct jffs_raw_inode) + f->nsize + BLOCK_SIZE)) {
|
| 2945 |
|
|
/* The space left is too small to be of any
|
| 2946 |
|
|
use really. */
|
| 2947 |
|
|
struct jffs_fm *dirty_fm
|
| 2948 |
|
|
= jffs_fmalloced(fmc,
|
| 2949 |
|
|
fmc->tail->offset + fmc->tail->size,
|
| 2950 |
|
|
free_chunk_size1, NULL);
|
| 2951 |
|
|
if (dirty_fm) {
|
| 2952 |
|
|
return -1;
|
| 2953 |
|
|
}
|
| 2954 |
|
|
jffs_write_dummy_node(c, dirty_fm);
|
| 2955 |
|
|
goto jffs_garbage_collect_next_end;
|
| 2956 |
|
|
}
|
| 2957 |
|
|
|
| 2958 |
|
|
size = free_chunk_size1;
|
| 2959 |
|
|
}
|
| 2960 |
|
|
|
| 2961 |
|
|
D2(printk(" size: %u (again)\n", size));
|
| 2962 |
|
|
|
| 2963 |
|
|
if (free_size - size < fmc->sector_size) {
|
| 2964 |
|
|
/* Just rewrite that node (or even less). */
|
| 2965 |
|
|
size -= (sizeof(struct jffs_raw_inode) + f->nsize);
|
| 2966 |
|
|
jffs_rewrite_data(f, node, jffs_min(node->data_size, size));
|
| 2967 |
|
|
}
|
| 2968 |
|
|
else {
|
| 2969 |
|
|
size -= (sizeof(struct jffs_raw_inode) + f->nsize);
|
| 2970 |
|
|
jffs_rewrite_data(f, node, size);
|
| 2971 |
|
|
}
|
| 2972 |
|
|
|
| 2973 |
|
|
jffs_garbage_collect_next_end:
|
| 2974 |
|
|
D3(printk("jffs_garbage_collect_next(): Leaving...\n"));
|
| 2975 |
|
|
return 0;
|
| 2976 |
|
|
}
|
| 2977 |
|
|
|
| 2978 |
|
|
|
| 2979 |
|
|
#if defined(JFFS_FLASH_SHORTCUT) && JFFS_FLASH_SHORTCUT
|
| 2980 |
|
|
|
| 2981 |
|
|
/* If an obsolete node is partly going to be erased due to garbage
|
| 2982 |
|
|
collection, the part that isn't going to be erased must be filled
|
| 2983 |
|
|
with zeroes so that the scan of the flash will work smoothly next
|
| 2984 |
|
|
time.
|
| 2985 |
|
|
There are two phases in this procedure: First, the clearing of
|
| 2986 |
|
|
the name and data parts of the node. Second, possibly also clearing
|
| 2987 |
|
|
a part of the raw inode as well. If the box is power cycled during
|
| 2988 |
|
|
the first phase, only the checksum of this node-to-be-cleared-at-
|
| 2989 |
|
|
the-end will be wrong. If the box is power cycled during, or after,
|
| 2990 |
|
|
the clearing of the raw inode, the information like the length of
|
| 2991 |
|
|
the name and data parts are zeroed. The next time the box is
|
| 2992 |
|
|
powered up, the scanning algorithm manages this faulty data too
|
| 2993 |
|
|
because:
|
| 2994 |
|
|
|
| 2995 |
|
|
- The checksum is invalid and thus the raw inode must be discarded
|
| 2996 |
|
|
in any case.
|
| 2997 |
|
|
- If the lengths of the data part or the name part are zeroed, the
|
| 2998 |
|
|
scanning just continues after the raw inode. But after the inode
|
| 2999 |
|
|
the scanning procedure just finds zeroes which is the same as
|
| 3000 |
|
|
dirt.
|
| 3001 |
|
|
|
| 3002 |
|
|
So, in the end, this could never fail. :-) Even if it does fail,
|
| 3003 |
|
|
the scanning algorithm should manage that too. */
|
| 3004 |
|
|
|
| 3005 |
|
|
static int
|
| 3006 |
|
|
jffs_clear_end_of_node(struct jffs_control *c, __u32 erase_size)
|
| 3007 |
|
|
{
|
| 3008 |
|
|
struct jffs_fm *fm;
|
| 3009 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 3010 |
|
|
__u32 zero_offset;
|
| 3011 |
|
|
__u32 zero_size;
|
| 3012 |
|
|
__u32 zero_offset_data;
|
| 3013 |
|
|
__u32 zero_size_data;
|
| 3014 |
|
|
__u32 cutting_raw_inode = 0;
|
| 3015 |
|
|
|
| 3016 |
|
|
if (!(fm = jffs_cut_node(fmc, erase_size))) {
|
| 3017 |
|
|
D3(printk("jffs_clear_end_of_node(): fm == NULL\n"));
|
| 3018 |
|
|
return 0;
|
| 3019 |
|
|
}
|
| 3020 |
|
|
|
| 3021 |
|
|
/* Where and how much shall we clear? */
|
| 3022 |
|
|
zero_offset = fmc->head->offset + erase_size;
|
| 3023 |
|
|
zero_size = fm->offset + fm->size - zero_offset;
|
| 3024 |
|
|
|
| 3025 |
|
|
/* Do we have to clear the raw_inode explicitly? */
|
| 3026 |
|
|
if (fm->size - zero_size < sizeof(struct jffs_raw_inode)) {
|
| 3027 |
|
|
cutting_raw_inode = sizeof(struct jffs_raw_inode)
|
| 3028 |
|
|
- (fm->size - zero_size);
|
| 3029 |
|
|
}
|
| 3030 |
|
|
|
| 3031 |
|
|
/* First, clear the name and data fields. */
|
| 3032 |
|
|
zero_offset_data = zero_offset + cutting_raw_inode;
|
| 3033 |
|
|
zero_size_data = zero_size - cutting_raw_inode;
|
| 3034 |
|
|
flash_safe_acquire(fmc->flash_part);
|
| 3035 |
|
|
flash_memset((unsigned char *) zero_offset_data, 0, zero_size_data);
|
| 3036 |
|
|
flash_safe_release(fmc->flash_part);
|
| 3037 |
|
|
|
| 3038 |
|
|
/* Should we clear a part of the raw inode? */
|
| 3039 |
|
|
if (cutting_raw_inode) {
|
| 3040 |
|
|
/* I guess it is ok to clear the raw inode in this order. */
|
| 3041 |
|
|
flash_safe_acquire(fmc->flash_part);
|
| 3042 |
|
|
flash_memset((unsigned char *) zero_offset, 0,
|
| 3043 |
|
|
cutting_raw_inode);
|
| 3044 |
|
|
flash_safe_release(fmc->flash_part);
|
| 3045 |
|
|
}
|
| 3046 |
|
|
|
| 3047 |
|
|
return 0;
|
| 3048 |
|
|
} /* jffs_clear_end_of_node() */
|
| 3049 |
|
|
|
| 3050 |
|
|
#else
|
| 3051 |
|
|
|
| 3052 |
|
|
static int
|
| 3053 |
|
|
jffs_clear_end_of_node(struct jffs_control *c, __u32 erase_size)
|
| 3054 |
|
|
{
|
| 3055 |
|
|
struct jffs_fm *fm;
|
| 3056 |
|
|
__u32 zero_offset;
|
| 3057 |
|
|
__u32 zero_size;
|
| 3058 |
|
|
__u32 first_block;
|
| 3059 |
|
|
__u32 last_block;
|
| 3060 |
|
|
__u32 block_offset;
|
| 3061 |
|
|
__u32 block_clear_size;
|
| 3062 |
|
|
__u32 block;
|
| 3063 |
|
|
int cutting_raw_inode = 0;
|
| 3064 |
|
|
struct buffer_head *bh;
|
| 3065 |
|
|
kdev_t dev;
|
| 3066 |
|
|
|
| 3067 |
|
|
if (!(fm = jffs_cut_node(c->fmc, erase_size))) {
|
| 3068 |
|
|
D(printk("jffs_clear_end_of_node(): fm == NULL\n"));
|
| 3069 |
|
|
return 0;
|
| 3070 |
|
|
}
|
| 3071 |
|
|
|
| 3072 |
|
|
/* It is necessary to write zeroes to the flash.
|
| 3073 |
|
|
Find out where and how much to write. */
|
| 3074 |
|
|
zero_offset = c->fmc->head->offset + erase_size;
|
| 3075 |
|
|
zero_size = fm->offset + fm->size - zero_offset;
|
| 3076 |
|
|
/* Do we have to clear the raw_inode explicitly? */
|
| 3077 |
|
|
if (fm->size - zero_size < sizeof(struct jffs_raw_inode)) {
|
| 3078 |
|
|
cutting_raw_inode = sizeof(struct jffs_raw_inode)
|
| 3079 |
|
|
- (fm->size - zero_size);
|
| 3080 |
|
|
}
|
| 3081 |
|
|
/* The last block of non-raw inode data should be
|
| 3082 |
|
|
cleared first. */
|
| 3083 |
|
|
first_block = zero_offset / BLOCK_SIZE;
|
| 3084 |
|
|
last_block = (zero_offset + zero_size) / BLOCK_SIZE;
|
| 3085 |
|
|
block_offset = 0;
|
| 3086 |
|
|
block_clear_size = (zero_offset + zero_size)
|
| 3087 |
|
|
- last_block * BLOCK_SIZE;
|
| 3088 |
|
|
dev = c->sb->s_dev;
|
| 3089 |
|
|
|
| 3090 |
|
|
D3(printk("jffs_clear_end_of_node(): zero_offset: 0x%08x\n", zero_offset));
|
| 3091 |
|
|
D3(printk("jffs_clear_end_of_node(): zero_size: 0x%08x\n", zero_size));
|
| 3092 |
|
|
D3(printk("jffs_clear_end_of_node(): first_block: 0x%08x\n", first_block));
|
| 3093 |
|
|
D3(printk("jffs_clear_end_of_node(): last_block: 0x%08x\n", last_block));
|
| 3094 |
|
|
D3(printk("jffs_clear_end_of_node(): block_offset: 0x%08x\n", block_offset));
|
| 3095 |
|
|
D3(printk("jffs_clear_end_of_node(): block_clear_size: 0x%08x\n", block_clear_size));
|
| 3096 |
|
|
|
| 3097 |
|
|
/* Fill the flash memory with zeroes. */
|
| 3098 |
|
|
for (block = last_block;
|
| 3099 |
|
|
block >= first_block; block--) {
|
| 3100 |
|
|
if (block == first_block) {
|
| 3101 |
|
|
block_offset = cutting_raw_inode;
|
| 3102 |
|
|
block_clear_size -= cutting_raw_inode;
|
| 3103 |
|
|
}
|
| 3104 |
|
|
if (!(bh = jffs_get_write_buffer(dev, block))) {
|
| 3105 |
|
|
D(printk("jffs_clear_end_of_node(): "
|
| 3106 |
|
|
"Failed to get buffer!\n"));
|
| 3107 |
|
|
return -1;
|
| 3108 |
|
|
}
|
| 3109 |
|
|
memset(&bh->b_data[block_offset], 0, block_clear_size);
|
| 3110 |
|
|
jffs_put_write_buffer(bh);
|
| 3111 |
|
|
block_clear_size = BLOCK_SIZE;
|
| 3112 |
|
|
}
|
| 3113 |
|
|
|
| 3114 |
|
|
if (cutting_raw_inode) {
|
| 3115 |
|
|
if (!(bh = jffs_get_write_buffer(dev, first_block))) {
|
| 3116 |
|
|
D(printk("jffs_clear_end_of_node(): Failed to "
|
| 3117 |
|
|
"get first buffer!\n"));
|
| 3118 |
|
|
return -1;
|
| 3119 |
|
|
}
|
| 3120 |
|
|
memset(bh->b_data, 0, cutting_raw_inode);
|
| 3121 |
|
|
jffs_put_write_buffer(bh);
|
| 3122 |
|
|
}
|
| 3123 |
|
|
|
| 3124 |
|
|
return 0;
|
| 3125 |
|
|
} /* jffs_clear_end_of_node() */
|
| 3126 |
|
|
|
| 3127 |
|
|
#endif
|
| 3128 |
|
|
|
| 3129 |
|
|
|
| 3130 |
|
|
/* Try to erase as much as possible of the dirt in the flash memory. */
|
| 3131 |
|
|
long
|
| 3132 |
|
|
jffs_try_to_erase(struct jffs_control *c)
|
| 3133 |
|
|
{
|
| 3134 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 3135 |
|
|
long erase_size;
|
| 3136 |
|
|
int err;
|
| 3137 |
|
|
__u32 offset;
|
| 3138 |
|
|
|
| 3139 |
|
|
D3(printk("jffs_try_to_erase()\n"));
|
| 3140 |
|
|
|
| 3141 |
|
|
erase_size = jffs_erasable_size(fmc);
|
| 3142 |
|
|
|
| 3143 |
|
|
D2(printk("jffs_try_to_erase(): erase_size = %ld\n", erase_size));
|
| 3144 |
|
|
|
| 3145 |
|
|
if (erase_size <= 0) {
|
| 3146 |
|
|
return erase_size;
|
| 3147 |
|
|
}
|
| 3148 |
|
|
|
| 3149 |
|
|
if (jffs_clear_end_of_node(c, erase_size) < 0) {
|
| 3150 |
|
|
printk(KERN_ERR "JFFS: Clearing of node failed.\n");
|
| 3151 |
|
|
return -1;
|
| 3152 |
|
|
}
|
| 3153 |
|
|
|
| 3154 |
|
|
offset = fmc->head->offset - fmc->flash_start;
|
| 3155 |
|
|
|
| 3156 |
|
|
/* Now, let's try to do the erase. */
|
| 3157 |
|
|
if ((err = flash_erase_region(c->sb->s_dev,
|
| 3158 |
|
|
offset, erase_size)) < 0) {
|
| 3159 |
|
|
printk(KERN_ERR "JFFS: Erase of flash failed. "
|
| 3160 |
|
|
"offset = %u, erase_size = %ld\n",
|
| 3161 |
|
|
offset, erase_size);
|
| 3162 |
|
|
/* XXX: Here we should allocate this area as dirty
|
| 3163 |
|
|
with jffs_fmalloced or something similar. Now
|
| 3164 |
|
|
we just report the error. */
|
| 3165 |
|
|
return err;
|
| 3166 |
|
|
}
|
| 3167 |
|
|
|
| 3168 |
|
|
#if 0
|
| 3169 |
|
|
/* Check if the erased sectors really got erased. */
|
| 3170 |
|
|
{
|
| 3171 |
|
|
__u32 pos;
|
| 3172 |
|
|
__u32 end;
|
| 3173 |
|
|
|
| 3174 |
|
|
pos = (__u32)flash_get_direct_pointer(c->sb->s_dev, offset);
|
| 3175 |
|
|
end = pos + erase_size;
|
| 3176 |
|
|
|
| 3177 |
|
|
D2(printk("JFFS: Checking erased sector(s)...\n"));
|
| 3178 |
|
|
|
| 3179 |
|
|
flash_safe_acquire(fmc->flash_part);
|
| 3180 |
|
|
|
| 3181 |
|
|
for (; pos < end; pos += 4) {
|
| 3182 |
|
|
if (*(__u32 *)pos != JFFS_EMPTY_BITMASK) {
|
| 3183 |
|
|
printk("JFFS: Erase failed! pos = 0x%p\n",
|
| 3184 |
|
|
(unsigned char *)pos);
|
| 3185 |
|
|
jffs_hexdump((unsigned char *)pos,
|
| 3186 |
|
|
jffs_min(256, end - pos));
|
| 3187 |
|
|
err = -1;
|
| 3188 |
|
|
break;
|
| 3189 |
|
|
}
|
| 3190 |
|
|
}
|
| 3191 |
|
|
|
| 3192 |
|
|
flash_safe_release(fmc->flash_part);
|
| 3193 |
|
|
|
| 3194 |
|
|
if (!err) {
|
| 3195 |
|
|
D2(printk("JFFS: Erase succeeded.\n"));
|
| 3196 |
|
|
}
|
| 3197 |
|
|
else {
|
| 3198 |
|
|
/* XXX: Here we should allocate the memory
|
| 3199 |
|
|
with jffs_fmalloced() in order to prevent
|
| 3200 |
|
|
JFFS from using this area accidentally. */
|
| 3201 |
|
|
return err;
|
| 3202 |
|
|
}
|
| 3203 |
|
|
}
|
| 3204 |
|
|
#endif
|
| 3205 |
|
|
|
| 3206 |
|
|
/* Update the flash memory data structures. */
|
| 3207 |
|
|
jffs_sync_erase(fmc, erase_size);
|
| 3208 |
|
|
|
| 3209 |
|
|
return erase_size;
|
| 3210 |
|
|
}
|
| 3211 |
|
|
|
| 3212 |
|
|
|
| 3213 |
|
|
/* There are different criteria that should trigger a garbage collect:
|
| 3214 |
|
|
1. There is too much dirt in the memory.
|
| 3215 |
|
|
2. The free space is becoming small.
|
| 3216 |
|
|
3. There are many versions of a node.
|
| 3217 |
|
|
|
| 3218 |
|
|
The garbage collect should always be done in a manner that guarantees
|
| 3219 |
|
|
that future garbage collects cannot be locked. E.g. Rewritten chunks
|
| 3220 |
|
|
should not be too large (span more than one sector in the flash memory
|
| 3221 |
|
|
for exemple). Of course there is a limit on how intelligent this garbage
|
| 3222 |
|
|
collection can be. */
|
| 3223 |
|
|
int
|
| 3224 |
|
|
jffs_garbage_collect(struct jffs_control *c)
|
| 3225 |
|
|
{
|
| 3226 |
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
| 3227 |
|
|
long erased_total = 0;
|
| 3228 |
|
|
long erased;
|
| 3229 |
|
|
int result = 0;
|
| 3230 |
|
|
D1(int i = 1);
|
| 3231 |
|
|
|
| 3232 |
|
|
D2(printk("***jffs_garbage_collect(): fmc->dirty_size = %u\n",
|
| 3233 |
|
|
fmc->dirty_size));
|
| 3234 |
|
|
D2(jffs_print_fmcontrol(fmc));
|
| 3235 |
|
|
|
| 3236 |
|
|
c->fmc->no_call_gc = 1;
|
| 3237 |
|
|
|
| 3238 |
|
|
/* While there is too much dirt left and it is possible
|
| 3239 |
|
|
to garbage collect, do so. */
|
| 3240 |
|
|
|
| 3241 |
|
|
while (fmc->dirty_size >= fmc->sector_size) {
|
| 3242 |
|
|
|
| 3243 |
|
|
D1(printk("***jffs_garbage_collect(): round #%u, "
|
| 3244 |
|
|
"fmc->dirty_size = %u\n", i++, fmc->dirty_size));
|
| 3245 |
|
|
D2(jffs_print_fmcontrol(fmc));
|
| 3246 |
|
|
|
| 3247 |
|
|
/* At least one sector should be able to free now. */
|
| 3248 |
|
|
if ((erased = jffs_try_to_erase(c)) < 0) {
|
| 3249 |
|
|
printk(KERN_WARNING "JFFS: Error in "
|
| 3250 |
|
|
"garbage collector.\n");
|
| 3251 |
|
|
result = erased;
|
| 3252 |
|
|
goto gc_end;
|
| 3253 |
|
|
}
|
| 3254 |
|
|
else if (erased == 0) {
|
| 3255 |
|
|
__u32 free_size = fmc->flash_size
|
| 3256 |
|
|
- (fmc->used_size
|
| 3257 |
|
|
+ fmc->dirty_size);
|
| 3258 |
|
|
|
| 3259 |
|
|
if (free_size > 0) {
|
| 3260 |
|
|
/* Let's dare to make a garbage collect. */
|
| 3261 |
|
|
if ((result = jffs_garbage_collect_next(c))
|
| 3262 |
|
|
< 0) {
|
| 3263 |
|
|
printk(KERN_ERR "JFFS: Something "
|
| 3264 |
|
|
"has gone seriously wrong "
|
| 3265 |
|
|
"with a garbage collect.\n");
|
| 3266 |
|
|
goto gc_end;
|
| 3267 |
|
|
}
|
| 3268 |
|
|
}
|
| 3269 |
|
|
else {
|
| 3270 |
|
|
/* What should we do here? */
|
| 3271 |
|
|
D(printk(" jffs_garbage_collect(): "
|
| 3272 |
|
|
"erased: %ld, free_size: %u\n",
|
| 3273 |
|
|
erased, free_size));
|
| 3274 |
|
|
result = -1;
|
| 3275 |
|
|
goto gc_end;
|
| 3276 |
|
|
}
|
| 3277 |
|
|
}
|
| 3278 |
|
|
|
| 3279 |
|
|
D1(printk(" jffs_garbage_collect(): erased: %ld\n", erased));
|
| 3280 |
|
|
erased_total += erased;
|
| 3281 |
|
|
DJM(jffs_print_memory_allocation_statistics());
|
| 3282 |
|
|
}
|
| 3283 |
|
|
|
| 3284 |
|
|
|
| 3285 |
|
|
gc_end:
|
| 3286 |
|
|
c->fmc->no_call_gc = 0;
|
| 3287 |
|
|
|
| 3288 |
|
|
D3(printk(" jffs_garbage_collect(): Leaving...\n"));
|
| 3289 |
|
|
D1(if (erased_total) {
|
| 3290 |
|
|
printk("erased_total = %ld\n", erased_total);
|
| 3291 |
|
|
jffs_print_fmcontrol(fmc);
|
| 3292 |
|
|
});
|
| 3293 |
|
|
return result;
|
| 3294 |
|
|
}
|
