| 1 |
199 |
simons |
/*
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| 2 |
|
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* linux/fs/fat/inode.c
|
| 3 |
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*
|
| 4 |
|
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* Written 1992,1993 by Werner Almesberger
|
| 5 |
|
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* VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
|
| 6 |
|
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*/
|
| 7 |
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|
| 8 |
|
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#define ASC_LINUX_VERSION(V, P, S) (((V) * 65536) + ((P) * 256) + (S))
|
| 9 |
|
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#include <linux/version.h>
|
| 10 |
|
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#define __NO_VERSION__
|
| 11 |
|
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#include <linux/module.h>
|
| 12 |
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|
| 13 |
|
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#include <linux/msdos_fs.h>
|
| 14 |
|
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#include <linux/nls.h>
|
| 15 |
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#include <linux/kernel.h>
|
| 16 |
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#include <linux/sched.h>
|
| 17 |
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#include <linux/errno.h>
|
| 18 |
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#include <linux/string.h>
|
| 19 |
|
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#include <linux/major.h>
|
| 20 |
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#include <linux/blkdev.h>
|
| 21 |
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#include <linux/fs.h>
|
| 22 |
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#include <linux/stat.h>
|
| 23 |
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#include <linux/locks.h>
|
| 24 |
|
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#include <linux/malloc.h>
|
| 25 |
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|
| 26 |
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#include "msbuffer.h"
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| 27 |
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|
| 28 |
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#if LINUX_VERSION_CODE >= ASC_LINUX_VERSION(2,1,0)
|
| 29 |
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#include <asm/uaccess.h>
|
| 30 |
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#define FAT_COPY_TO_USER(uaddr, kaddr, len) copy_to_user(uaddr, kaddr, len)
|
| 31 |
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#else
|
| 32 |
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#include <asm/segment.h>
|
| 33 |
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#define FAT_COPY_TO_USER(uaddr, kaddr, len) memcpy_tofs(uaddr, kaddr, len)
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| 34 |
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#endif
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| 35 |
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#include <asm/unaligned.h>
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| 36 |
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| 37 |
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#if 0
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| 38 |
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# define PRINTK(x) printk x
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| 39 |
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#else
|
| 40 |
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# define PRINTK(x)
|
| 41 |
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#endif
|
| 42 |
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|
| 43 |
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void fat_put_inode(struct inode *inode)
|
| 44 |
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{
|
| 45 |
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struct inode *depend, *linked;
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| 46 |
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struct super_block *sb;
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| 47 |
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| 48 |
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depend = MSDOS_I(inode)->i_depend;
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| 49 |
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linked = MSDOS_I(inode)->i_linked;
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| 50 |
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sb = inode->i_sb;
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| 51 |
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if (inode->i_nlink) {
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| 52 |
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if (depend) {
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| 53 |
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iput(depend);
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| 54 |
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}
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| 55 |
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if (linked) {
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| 56 |
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iput(linked);
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| 57 |
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MSDOS_I(inode)->i_linked = NULL;
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| 58 |
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}
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| 59 |
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if (MSDOS_I(inode)->i_busy) fat_cache_inval_inode(inode);
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| 60 |
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return;
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| 61 |
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}
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| 62 |
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inode->i_size = 0;
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| 63 |
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fat_truncate(inode);
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| 64 |
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if (depend) {
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| 65 |
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if (MSDOS_I(depend)->i_old != inode) {
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| 66 |
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printk("Invalid link (0x%p): expected 0x%p, got 0x%p\n",
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| 67 |
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depend, inode, MSDOS_I(depend)->i_old);
|
| 68 |
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fat_fs_panic(sb,"...");
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| 69 |
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goto done;
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| 70 |
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}
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| 71 |
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MSDOS_I(depend)->i_old = NULL;
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| 72 |
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iput(depend);
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| 73 |
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}
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| 74 |
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if (linked) {
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| 75 |
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if (MSDOS_I(linked)->i_oldlink != inode) {
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| 76 |
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printk("Invalid link (0x%p): expected 0x%p, got 0x%p\n",
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| 77 |
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linked, inode, MSDOS_I(linked)->i_oldlink);
|
| 78 |
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fat_fs_panic(sb,"...");
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| 79 |
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goto done;
|
| 80 |
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}
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| 81 |
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MSDOS_I(linked)->i_oldlink = NULL;
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| 82 |
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iput(linked);
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| 83 |
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}
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| 84 |
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done:
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| 85 |
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clear_inode(inode);
|
| 86 |
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}
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| 87 |
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| 88 |
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| 89 |
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void fat_put_super(struct super_block *sb)
|
| 90 |
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{
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| 91 |
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if (MSDOS_SB(sb)->fat_bits == 32) {
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| 92 |
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fat_clusters_flush(sb);
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| 93 |
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}
|
| 94 |
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fat_cache_inval_dev(sb->s_dev);
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| 95 |
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set_blocksize (sb->s_dev,BLOCK_SIZE);
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| 96 |
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if (MSDOS_SB(sb)->nls_disk) {
|
| 97 |
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unload_nls(MSDOS_SB(sb)->nls_disk);
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| 98 |
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MSDOS_SB(sb)->nls_disk = NULL;
|
| 99 |
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MSDOS_SB(sb)->options.codepage = 0;
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| 100 |
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}
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| 101 |
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if (MSDOS_SB(sb)->nls_io) {
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| 102 |
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unload_nls(MSDOS_SB(sb)->nls_io);
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| 103 |
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MSDOS_SB(sb)->nls_io = NULL;
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| 104 |
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kfree(MSDOS_SB(sb)->options.iocharset);
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| 105 |
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MSDOS_SB(sb)->options.iocharset = NULL;
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| 106 |
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}
|
| 107 |
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lock_super(sb);
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| 108 |
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sb->s_dev = 0;
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| 109 |
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unlock_super(sb);
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| 110 |
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MOD_DEC_USE_COUNT;
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| 111 |
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return;
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| 112 |
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}
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| 113 |
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| 114 |
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| 115 |
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static int parse_options(char *options,int *fat, int *blksize, int *debug,
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| 116 |
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struct fat_mount_options *opts)
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| 117 |
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{
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| 118 |
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char *this_char,*value,save,*savep;
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| 119 |
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char *p;
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| 120 |
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int ret, len;
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| 121 |
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| 122 |
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opts->name_check = 'n';
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| 123 |
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opts->conversion = 'b';
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| 124 |
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opts->fs_uid = current->uid;
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| 125 |
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opts->fs_gid = current->gid;
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| 126 |
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opts->fs_umask = current->fs->umask;
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| 127 |
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opts->quiet = opts->sys_immutable = opts->dotsOK = opts->showexec = 0;
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| 128 |
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opts->codepage = 0;
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| 129 |
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opts->utf8 = 0;
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| 130 |
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opts->iocharset = NULL;
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| 131 |
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*debug = *fat = 0;
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| 132 |
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| 133 |
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if (!options) return 1;
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| 134 |
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save = 0;
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| 135 |
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savep = NULL;
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| 136 |
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ret = 1;
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| 137 |
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for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
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| 138 |
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if ((value = strchr(this_char,'=')) != NULL) {
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| 139 |
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save = *value;
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| 140 |
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savep = value;
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| 141 |
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*value++ = 0;
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| 142 |
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}
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| 143 |
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if (!strcmp(this_char,"check") && value) {
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| 144 |
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if (value[0] && !value[1] && strchr("rns",*value))
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| 145 |
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opts->name_check = *value;
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| 146 |
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else if (!strcmp(value,"relaxed")) opts->name_check = 'r';
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| 147 |
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else if (!strcmp(value,"normal")) opts->name_check = 'n';
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| 148 |
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else if (!strcmp(value,"strict")) opts->name_check = 's';
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| 149 |
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else ret = 0;
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| 150 |
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}
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| 151 |
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else if (!strcmp(this_char,"conv") && value) {
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| 152 |
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if (value[0] && !value[1] && strchr("bta",*value))
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| 153 |
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opts->conversion = *value;
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| 154 |
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else if (!strcmp(value,"binary")) opts->conversion = 'b';
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| 155 |
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else if (!strcmp(value,"text")) opts->conversion = 't';
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| 156 |
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else if (!strcmp(value,"auto")) opts->conversion = 'a';
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| 157 |
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else ret = 0;
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| 158 |
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}
|
| 159 |
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else if (!strcmp(this_char,"dots")) {
|
| 160 |
|
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opts->dotsOK = 1;
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| 161 |
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}
|
| 162 |
|
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else if (!strcmp(this_char,"nodots")) {
|
| 163 |
|
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opts->dotsOK = 0;
|
| 164 |
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}
|
| 165 |
|
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else if (!strcmp(this_char,"showexec")) {
|
| 166 |
|
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opts->showexec = 1;
|
| 167 |
|
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}
|
| 168 |
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else if (!strcmp(this_char,"dotsOK") && value) {
|
| 169 |
|
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if (!strcmp(value,"yes")) opts->dotsOK = 1;
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| 170 |
|
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else if (!strcmp(value,"no")) opts->dotsOK = 0;
|
| 171 |
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else ret = 0;
|
| 172 |
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}
|
| 173 |
|
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else if (!strcmp(this_char,"uid")) {
|
| 174 |
|
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if (!value || !*value) ret = 0;
|
| 175 |
|
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else {
|
| 176 |
|
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opts->fs_uid = simple_strtoul(value,&value,0);
|
| 177 |
|
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if (*value) ret = 0;
|
| 178 |
|
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}
|
| 179 |
|
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}
|
| 180 |
|
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else if (!strcmp(this_char,"gid")) {
|
| 181 |
|
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if (!value || !*value) ret= 0;
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| 182 |
|
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else {
|
| 183 |
|
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opts->fs_gid = simple_strtoul(value,&value,0);
|
| 184 |
|
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if (*value) ret = 0;
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| 185 |
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}
|
| 186 |
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}
|
| 187 |
|
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else if (!strcmp(this_char,"umask")) {
|
| 188 |
|
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if (!value || !*value) ret = 0;
|
| 189 |
|
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else {
|
| 190 |
|
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opts->fs_umask = simple_strtoul(value,&value,8);
|
| 191 |
|
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if (*value) ret = 0;
|
| 192 |
|
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}
|
| 193 |
|
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}
|
| 194 |
|
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else if (!strcmp(this_char,"debug")) {
|
| 195 |
|
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if (value) ret = 0;
|
| 196 |
|
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else *debug = 1;
|
| 197 |
|
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}
|
| 198 |
|
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else if (!strcmp(this_char,"fat")) {
|
| 199 |
|
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if (!value || !*value) ret = 0;
|
| 200 |
|
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else {
|
| 201 |
|
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*fat = simple_strtoul(value,&value,0);
|
| 202 |
|
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if (*value || (*fat != 12 && *fat != 16 &&
|
| 203 |
|
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*fat != 32))
|
| 204 |
|
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ret = 0;
|
| 205 |
|
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}
|
| 206 |
|
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}
|
| 207 |
|
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else if (!strcmp(this_char,"quiet")) {
|
| 208 |
|
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if (value) ret = 0;
|
| 209 |
|
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else opts->quiet = 1;
|
| 210 |
|
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}
|
| 211 |
|
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else if (!strcmp(this_char,"blocksize")) {
|
| 212 |
|
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*blksize = simple_strtoul(value,&value,0);
|
| 213 |
|
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if (*value) ret = 0;
|
| 214 |
|
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else if (*blksize != 512 && *blksize != 1024){
|
| 215 |
|
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printk ("MSDOS FS: Invalid blocksize (512 or 1024)\n");
|
| 216 |
|
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}
|
| 217 |
|
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}
|
| 218 |
|
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else if (!strcmp(this_char,"sys_immutable")) {
|
| 219 |
|
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if (value) ret = 0;
|
| 220 |
|
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else opts->sys_immutable = 1;
|
| 221 |
|
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}
|
| 222 |
|
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else if (!strcmp(this_char,"codepage")) {
|
| 223 |
|
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opts->codepage = simple_strtoul(value,&value,0);
|
| 224 |
|
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if (*value) ret = 0;
|
| 225 |
|
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else printk ("MSDOS FS: Using codepage %d\n", opts->codepage);
|
| 226 |
|
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}
|
| 227 |
|
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else if (!strcmp(this_char,"iocharset")) {
|
| 228 |
|
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p = value;
|
| 229 |
|
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while (*value && *value != ',') value++;
|
| 230 |
|
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len = value - p;
|
| 231 |
|
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if (len) {
|
| 232 |
|
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opts->iocharset = kmalloc(len+1, GFP_KERNEL);
|
| 233 |
|
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memcpy(opts->iocharset, p, len);
|
| 234 |
|
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opts->iocharset[len] = 0;
|
| 235 |
|
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printk ("MSDOS FS: Using IO charset %s\n",
|
| 236 |
|
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opts->iocharset);
|
| 237 |
|
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} else {
|
| 238 |
|
|
opts->iocharset = NULL;
|
| 239 |
|
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ret = 0;
|
| 240 |
|
|
}
|
| 241 |
|
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}
|
| 242 |
|
|
|
| 243 |
|
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if (this_char != options) *(this_char-1) = ',';
|
| 244 |
|
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if (value) *savep = save;
|
| 245 |
|
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if (ret == 0) return 0;
|
| 246 |
|
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}
|
| 247 |
|
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return 1;
|
| 248 |
|
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}
|
| 249 |
|
|
|
| 250 |
|
|
|
| 251 |
|
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/* Read the super block of an MS-DOS FS. */
|
| 252 |
|
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/* XXX: Make sure we handle the case of no codepage (unable to load) */
|
| 253 |
|
|
struct super_block *fat_read_super(struct super_block *sb,void *data, int silent)
|
| 254 |
|
|
{
|
| 255 |
|
|
struct buffer_head *bh;
|
| 256 |
|
|
struct fat_boot_sector *b;
|
| 257 |
|
|
int data_sectors,logical_sector_size,sector_mult,fat_clusters=0;
|
| 258 |
|
|
int debug,error,fat,cp;
|
| 259 |
|
|
int blksize = 512;
|
| 260 |
|
|
int fat32;
|
| 261 |
|
|
struct fat_mount_options opts;
|
| 262 |
|
|
char buf[50];
|
| 263 |
|
|
char *p;
|
| 264 |
|
|
|
| 265 |
|
|
MOD_INC_USE_COUNT;
|
| 266 |
|
|
if (hardsect_size[MAJOR(sb->s_dev)] != NULL){
|
| 267 |
|
|
blksize = hardsect_size[MAJOR(sb->s_dev)][MINOR(sb->s_dev)];
|
| 268 |
|
|
if (blksize != 512){
|
| 269 |
|
|
printk ("MSDOS: Hardware sector size is %d\n",blksize);
|
| 270 |
|
|
}
|
| 271 |
|
|
}
|
| 272 |
|
|
opts.isvfat = MSDOS_SB(sb)->options.isvfat;
|
| 273 |
|
|
if (!parse_options((char *) data, &fat, &blksize, &debug, &opts)
|
| 274 |
|
|
|| (blksize != 512 && blksize != 1024)) {
|
| 275 |
|
|
sb->s_dev = 0;
|
| 276 |
|
|
MOD_DEC_USE_COUNT;
|
| 277 |
|
|
return NULL;
|
| 278 |
|
|
}
|
| 279 |
|
|
cache_init();
|
| 280 |
|
|
lock_super(sb);
|
| 281 |
|
|
/* The first read is always 1024 bytes */
|
| 282 |
|
|
sb->s_blocksize = 1024;
|
| 283 |
|
|
set_blocksize(sb->s_dev, 1024);
|
| 284 |
|
|
bh = fat_bread(sb, 0);
|
| 285 |
|
|
unlock_super(sb);
|
| 286 |
|
|
if (bh == NULL || !fat_is_uptodate(sb,bh)) {
|
| 287 |
|
|
fat_brelse (sb, bh);
|
| 288 |
|
|
sb->s_dev = 0;
|
| 289 |
|
|
printk("FAT bread failed\n");
|
| 290 |
|
|
MOD_DEC_USE_COUNT;
|
| 291 |
|
|
return NULL;
|
| 292 |
|
|
}
|
| 293 |
|
|
set_blocksize(sb->s_dev, blksize);
|
| 294 |
|
|
|
| 295 |
|
|
/*
|
| 296 |
|
|
* The DOS3 partition size limit is *not* 32M as many people think.
|
| 297 |
|
|
* Instead, it is 64K sectors (with the usual sector size being
|
| 298 |
|
|
* 512 bytes, leading to a 32M limit).
|
| 299 |
|
|
*
|
| 300 |
|
|
* DOS 3 partition managers got around this problem by faking a
|
| 301 |
|
|
* larger sector size, ie treating multiple physical sectors as
|
| 302 |
|
|
* a single logical sector.
|
| 303 |
|
|
*
|
| 304 |
|
|
* We can accommodate this scheme by adjusting our cluster size,
|
| 305 |
|
|
* fat_start, and data_start by an appropriate value.
|
| 306 |
|
|
*
|
| 307 |
|
|
* (by Drew Eckhardt)
|
| 308 |
|
|
*/
|
| 309 |
|
|
|
| 310 |
|
|
#define ROUND_TO_MULTIPLE(n,m) ((n) && (m) ? (n)+(m)-1-((n)-1)%(m) : 0)
|
| 311 |
|
|
/* don't divide by zero */
|
| 312 |
|
|
|
| 313 |
|
|
b = (struct fat_boot_sector *) bh->b_data;
|
| 314 |
|
|
logical_sector_size =
|
| 315 |
|
|
CF_LE_W(get_unaligned((unsigned short *) &b->sector_size));
|
| 316 |
|
|
sector_mult = logical_sector_size >> SECTOR_BITS;
|
| 317 |
|
|
MSDOS_SB(sb)->cluster_size = b->cluster_size*sector_mult;
|
| 318 |
|
|
MSDOS_SB(sb)->fats = b->fats;
|
| 319 |
|
|
MSDOS_SB(sb)->fat_start = CF_LE_W(b->reserved)*sector_mult;
|
| 320 |
|
|
if (!b->fat_length && b->fat32_length) {
|
| 321 |
|
|
struct fat_boot_fsinfo *fsinfo;
|
| 322 |
|
|
|
| 323 |
|
|
/* Must be FAT32 */
|
| 324 |
|
|
fat32 = 1;
|
| 325 |
|
|
MSDOS_SB(sb)->fat_length= CF_LE_W(b->fat32_length)*sector_mult;
|
| 326 |
|
|
MSDOS_SB(sb)->root_cluster = CF_LE_L(b->root_cluster);
|
| 327 |
|
|
MSDOS_SB(sb)->fsinfo_offset =
|
| 328 |
|
|
CF_LE_W(b->info_sector) * logical_sector_size + 0x1e0;
|
| 329 |
|
|
fsinfo = (struct fat_boot_fsinfo *)
|
| 330 |
|
|
&bh->b_data[MSDOS_SB(sb)->fsinfo_offset];
|
| 331 |
|
|
if (CF_LE_L(fsinfo->signature) != 0x61417272) {
|
| 332 |
|
|
printk("fat_read_super: Did not find valid FSINFO signature. Found 0x%x\n", CF_LE_L(fsinfo->signature));
|
| 333 |
|
|
} else {
|
| 334 |
|
|
MSDOS_SB(sb)->free_clusters = CF_LE_L(fsinfo->free_clusters);
|
| 335 |
|
|
}
|
| 336 |
|
|
} else {
|
| 337 |
|
|
fat32 = 0;
|
| 338 |
|
|
MSDOS_SB(sb)->fat_length = CF_LE_W(b->fat_length)*sector_mult;
|
| 339 |
|
|
MSDOS_SB(sb)->root_cluster = 0;
|
| 340 |
|
|
MSDOS_SB(sb)->free_clusters = -1; /* Don't know yet */
|
| 341 |
|
|
}
|
| 342 |
|
|
MSDOS_SB(sb)->dir_start= CF_LE_W(b->reserved)*sector_mult+
|
| 343 |
|
|
b->fats*MSDOS_SB(sb)->fat_length;
|
| 344 |
|
|
MSDOS_SB(sb)->dir_entries =
|
| 345 |
|
|
CF_LE_W(get_unaligned((unsigned short *) &b->dir_entries));
|
| 346 |
|
|
MSDOS_SB(sb)->data_start = MSDOS_SB(sb)->dir_start+ROUND_TO_MULTIPLE((
|
| 347 |
|
|
MSDOS_SB(sb)->dir_entries << MSDOS_DIR_BITS) >> SECTOR_BITS,
|
| 348 |
|
|
sector_mult);
|
| 349 |
|
|
data_sectors = CF_LE_W(get_unaligned((unsigned short *) &b->sectors));
|
| 350 |
|
|
if (!data_sectors) {
|
| 351 |
|
|
data_sectors = CF_LE_L(b->total_sect);
|
| 352 |
|
|
}
|
| 353 |
|
|
data_sectors = data_sectors * sector_mult - MSDOS_SB(sb)->data_start;
|
| 354 |
|
|
error = !b->cluster_size || !sector_mult;
|
| 355 |
|
|
if (!error) {
|
| 356 |
|
|
MSDOS_SB(sb)->clusters = b->cluster_size ? data_sectors/
|
| 357 |
|
|
b->cluster_size/sector_mult : 0;
|
| 358 |
|
|
MSDOS_SB(sb)->fat_bits = fat32 ? 32 :
|
| 359 |
|
|
(fat ? fat :
|
| 360 |
|
|
(MSDOS_SB(sb)->clusters > MSDOS_FAT12 ? 16 : 12));
|
| 361 |
|
|
fat_clusters = MSDOS_SB(sb)->fat_length*SECTOR_SIZE*8/
|
| 362 |
|
|
MSDOS_SB(sb)->fat_bits;
|
| 363 |
|
|
error = !MSDOS_SB(sb)->fats || (MSDOS_SB(sb)->dir_entries &
|
| 364 |
|
|
(MSDOS_DPS-1)) || MSDOS_SB(sb)->clusters+2 > fat_clusters+
|
| 365 |
|
|
MSDOS_MAX_EXTRA || (logical_sector_size & (SECTOR_SIZE-1))
|
| 366 |
|
|
|| !b->secs_track || !b->heads;
|
| 367 |
|
|
}
|
| 368 |
|
|
fat_brelse(sb, bh);
|
| 369 |
|
|
/*
|
| 370 |
|
|
This must be done after the brelse because the bh is a dummy
|
| 371 |
|
|
allocated by fat_bread (see buffer.c)
|
| 372 |
|
|
*/
|
| 373 |
|
|
sb->s_blocksize = blksize; /* Using this small block size solves */
|
| 374 |
|
|
/* the misfit with buffer cache and cluster */
|
| 375 |
|
|
/* because clusters (DOS) are often aligned */
|
| 376 |
|
|
/* on odd sectors. */
|
| 377 |
|
|
sb->s_blocksize_bits = blksize == 512 ? 9 : 10;
|
| 378 |
|
|
if (error || debug) {
|
| 379 |
|
|
/* The MSDOS_CAN_BMAP is obsolete, but left just to remember */
|
| 380 |
|
|
printk("[MS-DOS FS Rel. 12,FAT %d,check=%c,conv=%c,"
|
| 381 |
|
|
"uid=%d,gid=%d,umask=%03o%s]\n",
|
| 382 |
|
|
MSDOS_SB(sb)->fat_bits,opts.name_check,
|
| 383 |
|
|
opts.conversion,opts.fs_uid,opts.fs_gid,opts.fs_umask,
|
| 384 |
|
|
MSDOS_CAN_BMAP(MSDOS_SB(sb)) ? ",bmap" : "");
|
| 385 |
|
|
printk("[me=0x%x,cs=%d,#f=%d,fs=%d,fl=%d,ds=%d,de=%d,data=%d,"
|
| 386 |
|
|
"se=%d,ts=%ld,ls=%d,rc=%ld,fc=%u]\n",b->media,MSDOS_SB(sb)->cluster_size,
|
| 387 |
|
|
MSDOS_SB(sb)->fats,MSDOS_SB(sb)->fat_start,MSDOS_SB(sb)->fat_length,
|
| 388 |
|
|
MSDOS_SB(sb)->dir_start,MSDOS_SB(sb)->dir_entries,
|
| 389 |
|
|
MSDOS_SB(sb)->data_start,
|
| 390 |
|
|
CF_LE_W(*(unsigned short *) &b->sectors),
|
| 391 |
|
|
(unsigned long)b->total_sect,logical_sector_size,
|
| 392 |
|
|
MSDOS_SB(sb)->root_cluster,MSDOS_SB(sb)->free_clusters);
|
| 393 |
|
|
printk ("Transaction block size = %d\n",blksize);
|
| 394 |
|
|
}
|
| 395 |
|
|
if (MSDOS_SB(sb)->clusters+2 > fat_clusters)
|
| 396 |
|
|
MSDOS_SB(sb)->clusters = fat_clusters-2;
|
| 397 |
|
|
if (error) {
|
| 398 |
|
|
if (!silent)
|
| 399 |
|
|
printk("VFS: Can't find a valid MSDOS filesystem on dev "
|
| 400 |
|
|
"%s.\n", kdevname(sb->s_dev));
|
| 401 |
|
|
sb->s_dev = 0;
|
| 402 |
|
|
MOD_DEC_USE_COUNT;
|
| 403 |
|
|
return NULL;
|
| 404 |
|
|
}
|
| 405 |
|
|
sb->s_magic = MSDOS_SUPER_MAGIC;
|
| 406 |
|
|
/* set up enough so that it can read an inode */
|
| 407 |
|
|
MSDOS_SB(sb)->fat_wait = NULL;
|
| 408 |
|
|
MSDOS_SB(sb)->fat_lock = 0;
|
| 409 |
|
|
MSDOS_SB(sb)->prev_free = 0;
|
| 410 |
|
|
memcpy(&(MSDOS_SB(sb)->options), &opts, sizeof(struct fat_mount_options));
|
| 411 |
|
|
|
| 412 |
|
|
cp = opts.codepage ? opts.codepage : 437;
|
| 413 |
|
|
sprintf(buf, "cp%d", cp);
|
| 414 |
|
|
MSDOS_SB(sb)->nls_disk = load_nls(buf);
|
| 415 |
|
|
if (! MSDOS_SB(sb)->nls_disk) {
|
| 416 |
|
|
/* Fail only if explicit charset specified */
|
| 417 |
|
|
if (opts.codepage == 0) {
|
| 418 |
|
|
MSDOS_SB(sb)->options.codepage = 0;
|
| 419 |
|
|
MSDOS_SB(sb)->nls_disk = load_nls_default();
|
| 420 |
|
|
} else {
|
| 421 |
|
|
sb->s_dev = 0;
|
| 422 |
|
|
MOD_DEC_USE_COUNT;
|
| 423 |
|
|
return NULL;
|
| 424 |
|
|
}
|
| 425 |
|
|
}
|
| 426 |
|
|
|
| 427 |
|
|
p = opts.iocharset ? opts.iocharset : "iso8859-1";
|
| 428 |
|
|
MSDOS_SB(sb)->nls_io = NULL;
|
| 429 |
|
|
if (MSDOS_SB(sb)->options.isvfat && !opts.utf8) {
|
| 430 |
|
|
MSDOS_SB(sb)->nls_io = load_nls(p);
|
| 431 |
|
|
if (! MSDOS_SB(sb)->nls_io) {
|
| 432 |
|
|
/* Fail only if explicit charset specified */
|
| 433 |
|
|
if (opts.iocharset) {
|
| 434 |
|
|
kfree(opts.iocharset);
|
| 435 |
|
|
unload_nls(MSDOS_SB(sb)->nls_disk);
|
| 436 |
|
|
sb->s_dev = 0;
|
| 437 |
|
|
MOD_DEC_USE_COUNT;
|
| 438 |
|
|
return NULL;
|
| 439 |
|
|
} else {
|
| 440 |
|
|
MSDOS_SB(sb)->nls_io = load_nls_default();
|
| 441 |
|
|
}
|
| 442 |
|
|
}
|
| 443 |
|
|
}
|
| 444 |
|
|
|
| 445 |
|
|
if (!(sb->s_mounted = iget(sb,MSDOS_ROOT_INO))) {
|
| 446 |
|
|
sb->s_dev = 0;
|
| 447 |
|
|
printk("get root inode failed\n");
|
| 448 |
|
|
unload_nls(MSDOS_SB(sb)->nls_disk);
|
| 449 |
|
|
if (MSDOS_SB(sb)->nls_io) unload_nls(MSDOS_SB(sb)->nls_io);
|
| 450 |
|
|
if (opts.iocharset) kfree(opts.iocharset);
|
| 451 |
|
|
MOD_DEC_USE_COUNT;
|
| 452 |
|
|
return NULL;
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
return sb;
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
|
| 459 |
|
|
void fat_statfs(struct super_block *sb,struct statfs *buf, int bufsiz)
|
| 460 |
|
|
{
|
| 461 |
|
|
int free,nr;
|
| 462 |
|
|
struct statfs tmp;
|
| 463 |
|
|
|
| 464 |
|
|
lock_fat(sb);
|
| 465 |
|
|
if (MSDOS_SB(sb)->free_clusters != -1)
|
| 466 |
|
|
free = MSDOS_SB(sb)->free_clusters;
|
| 467 |
|
|
else {
|
| 468 |
|
|
free = 0;
|
| 469 |
|
|
for (nr = 2; nr < MSDOS_SB(sb)->clusters+2; nr++)
|
| 470 |
|
|
if (!fat_access(sb,nr,-1)) free++;
|
| 471 |
|
|
MSDOS_SB(sb)->free_clusters = free;
|
| 472 |
|
|
}
|
| 473 |
|
|
unlock_fat(sb);
|
| 474 |
|
|
tmp.f_type = sb->s_magic;
|
| 475 |
|
|
tmp.f_bsize = MSDOS_SB(sb)->cluster_size*SECTOR_SIZE;
|
| 476 |
|
|
tmp.f_blocks = MSDOS_SB(sb)->clusters;
|
| 477 |
|
|
tmp.f_bfree = free;
|
| 478 |
|
|
tmp.f_bavail = free;
|
| 479 |
|
|
tmp.f_files = 0;
|
| 480 |
|
|
tmp.f_ffree = 0;
|
| 481 |
|
|
tmp.f_namelen = 12;
|
| 482 |
|
|
FAT_COPY_TO_USER(buf, &tmp, bufsiz);
|
| 483 |
|
|
}
|
| 484 |
|
|
|
| 485 |
|
|
|
| 486 |
|
|
int fat_bmap(struct inode *inode,int block)
|
| 487 |
|
|
{
|
| 488 |
|
|
struct msdos_sb_info *sb;
|
| 489 |
|
|
int cluster,offset;
|
| 490 |
|
|
|
| 491 |
|
|
sb = MSDOS_SB(inode->i_sb);
|
| 492 |
|
|
if ((inode->i_ino == MSDOS_ROOT_INO) && (sb->fat_bits != 32)) {
|
| 493 |
|
|
return sb->dir_start + block;
|
| 494 |
|
|
}
|
| 495 |
|
|
cluster = block/sb->cluster_size;
|
| 496 |
|
|
offset = block % sb->cluster_size;
|
| 497 |
|
|
if (!(cluster = get_cluster(inode,cluster))) return 0;
|
| 498 |
|
|
return (cluster-2)*sb->cluster_size+sb->data_start+offset;
|
| 499 |
|
|
}
|
| 500 |
|
|
|
| 501 |
|
|
static int is_exec(char *extension)
|
| 502 |
|
|
{
|
| 503 |
|
|
char *exe_extensions = "EXECOMBAT", *walk;
|
| 504 |
|
|
|
| 505 |
|
|
for (walk = exe_extensions; *walk; walk += 3)
|
| 506 |
|
|
if (!strncmp(extension, walk, 3))
|
| 507 |
|
|
return 1;
|
| 508 |
|
|
return 0;
|
| 509 |
|
|
}
|
| 510 |
|
|
|
| 511 |
|
|
void fat_read_inode(struct inode *inode, struct inode_operations *fs_dir_inode_ops)
|
| 512 |
|
|
{
|
| 513 |
|
|
struct super_block *sb = inode->i_sb;
|
| 514 |
|
|
struct buffer_head *bh;
|
| 515 |
|
|
struct msdos_dir_entry *raw_entry;
|
| 516 |
|
|
int nr;
|
| 517 |
|
|
|
| 518 |
|
|
PRINTK(("fat_read_inode: inode=%p, sb->dir_start=0x%x\n",
|
| 519 |
|
|
inode, MSDOS_SB(sb)->dir_start));
|
| 520 |
|
|
MSDOS_I(inode)->i_busy = 0;
|
| 521 |
|
|
MSDOS_I(inode)->i_depend = MSDOS_I(inode)->i_old = NULL;
|
| 522 |
|
|
MSDOS_I(inode)->i_linked = MSDOS_I(inode)->i_oldlink = NULL;
|
| 523 |
|
|
MSDOS_I(inode)->i_binary = 1;
|
| 524 |
|
|
inode->i_uid = MSDOS_SB(sb)->options.fs_uid;
|
| 525 |
|
|
inode->i_gid = MSDOS_SB(sb)->options.fs_gid;
|
| 526 |
|
|
inode->i_version = ++event;
|
| 527 |
|
|
if (inode->i_ino == MSDOS_ROOT_INO) {
|
| 528 |
|
|
inode->i_mode = (S_IRWXUGO & ~MSDOS_SB(sb)->options.fs_umask) |
|
| 529 |
|
|
S_IFDIR;
|
| 530 |
|
|
inode->i_op = fs_dir_inode_ops;
|
| 531 |
|
|
if (MSDOS_SB(sb)->fat_bits == 32) {
|
| 532 |
|
|
MSDOS_I(inode)->i_start = MSDOS_SB(sb)->root_cluster;
|
| 533 |
|
|
if ((nr = MSDOS_I(inode)->i_start) != 0) {
|
| 534 |
|
|
while (nr != -1) {
|
| 535 |
|
|
inode->i_size += SECTOR_SIZE*MSDOS_SB(sb)->cluster_size;
|
| 536 |
|
|
if (!(nr = fat_access(sb,nr,-1))) {
|
| 537 |
|
|
printk("Directory %ld: bad FAT\n",
|
| 538 |
|
|
inode->i_ino);
|
| 539 |
|
|
break;
|
| 540 |
|
|
}
|
| 541 |
|
|
}
|
| 542 |
|
|
}
|
| 543 |
|
|
} else {
|
| 544 |
|
|
MSDOS_I(inode)->i_start = 0;
|
| 545 |
|
|
inode->i_size = MSDOS_SB(sb)->dir_entries*
|
| 546 |
|
|
sizeof(struct msdos_dir_entry);
|
| 547 |
|
|
}
|
| 548 |
|
|
inode->i_blksize = MSDOS_SB(sb)->cluster_size*
|
| 549 |
|
|
SECTOR_SIZE;
|
| 550 |
|
|
inode->i_blocks = (inode->i_size+inode->i_blksize-1)/
|
| 551 |
|
|
inode->i_blksize*MSDOS_SB(sb)->cluster_size;
|
| 552 |
|
|
MSDOS_I(inode)->i_logstart = 0;
|
| 553 |
|
|
|
| 554 |
|
|
MSDOS_I(inode)->i_attrs = 0;
|
| 555 |
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = 0;
|
| 556 |
|
|
inode->i_nlink = fat_subdirs(inode)+2;
|
| 557 |
|
|
/* subdirs (neither . nor ..) plus . and "self" */
|
| 558 |
|
|
return;
|
| 559 |
|
|
}
|
| 560 |
|
|
if (!(bh = fat_bread(sb, inode->i_ino >> MSDOS_DPB_BITS))) {
|
| 561 |
|
|
printk("dev = %s, ino = %ld\n",
|
| 562 |
|
|
kdevname(inode->i_dev), inode->i_ino);
|
| 563 |
|
|
panic("fat_read_inode: unable to read i-node block");
|
| 564 |
|
|
}
|
| 565 |
|
|
raw_entry = &((struct msdos_dir_entry *) (bh->b_data))
|
| 566 |
|
|
[inode->i_ino & (MSDOS_DPB-1)];
|
| 567 |
|
|
if ((raw_entry->attr & ATTR_DIR) && !IS_FREE(raw_entry->name)) {
|
| 568 |
|
|
inode->i_mode = MSDOS_MKMODE(raw_entry->attr,S_IRWXUGO &
|
| 569 |
|
|
~MSDOS_SB(sb)->options.fs_umask) | S_IFDIR;
|
| 570 |
|
|
inode->i_op = fs_dir_inode_ops;
|
| 571 |
|
|
|
| 572 |
|
|
MSDOS_I(inode)->i_start = CF_LE_W(raw_entry->start);
|
| 573 |
|
|
if (MSDOS_SB(sb)->fat_bits == 32) {
|
| 574 |
|
|
MSDOS_I(inode)->i_start |=
|
| 575 |
|
|
(CF_LE_W(raw_entry->starthi) << 16);
|
| 576 |
|
|
}
|
| 577 |
|
|
MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
|
| 578 |
|
|
inode->i_nlink = fat_subdirs(inode);
|
| 579 |
|
|
/* includes .., compensating for "self" */
|
| 580 |
|
|
#ifdef DEBUG
|
| 581 |
|
|
if (!inode->i_nlink) {
|
| 582 |
|
|
printk("directory %d: i_nlink == 0\n",inode->i_ino);
|
| 583 |
|
|
inode->i_nlink = 1;
|
| 584 |
|
|
}
|
| 585 |
|
|
#endif
|
| 586 |
|
|
inode->i_size = 0;
|
| 587 |
|
|
if ((nr = MSDOS_I(inode)->i_start) != 0)
|
| 588 |
|
|
while (nr != -1) {
|
| 589 |
|
|
inode->i_size += SECTOR_SIZE*MSDOS_SB(inode->
|
| 590 |
|
|
i_sb)->cluster_size;
|
| 591 |
|
|
if (!(nr = fat_access(sb,nr,-1))) {
|
| 592 |
|
|
printk("Directory %ld: bad FAT\n",
|
| 593 |
|
|
inode->i_ino);
|
| 594 |
|
|
break;
|
| 595 |
|
|
}
|
| 596 |
|
|
}
|
| 597 |
|
|
} else { /* not a directory */
|
| 598 |
|
|
inode->i_mode = MSDOS_MKMODE(raw_entry->attr,
|
| 599 |
|
|
((IS_NOEXEC(inode) ||
|
| 600 |
|
|
(MSDOS_SB(sb)->options.showexec &&
|
| 601 |
|
|
!is_exec(raw_entry->ext)))
|
| 602 |
|
|
? S_IRUGO|S_IWUGO : S_IRWXUGO)
|
| 603 |
|
|
& ~MSDOS_SB(sb)->options.fs_umask) | S_IFREG;
|
| 604 |
|
|
inode->i_op = (sb->s_blocksize == 1024)
|
| 605 |
|
|
? &fat_file_inode_operations_1024
|
| 606 |
|
|
: &fat_file_inode_operations;
|
| 607 |
|
|
MSDOS_I(inode)->i_start = CF_LE_W(raw_entry->start);
|
| 608 |
|
|
if (MSDOS_SB(sb)->fat_bits == 32) {
|
| 609 |
|
|
MSDOS_I(inode)->i_start |=
|
| 610 |
|
|
(CF_LE_W(raw_entry->starthi) << 16);
|
| 611 |
|
|
}
|
| 612 |
|
|
MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
|
| 613 |
|
|
inode->i_nlink = 1;
|
| 614 |
|
|
inode->i_size = CF_LE_L(raw_entry->size);
|
| 615 |
|
|
}
|
| 616 |
|
|
if(raw_entry->attr & ATTR_SYS)
|
| 617 |
|
|
if (MSDOS_SB(sb)->options.sys_immutable)
|
| 618 |
|
|
inode->i_flags |= S_IMMUTABLE;
|
| 619 |
|
|
MSDOS_I(inode)->i_binary = is_binary(MSDOS_SB(sb)->options.conversion,
|
| 620 |
|
|
raw_entry->ext);
|
| 621 |
|
|
MSDOS_I(inode)->i_attrs = raw_entry->attr & ATTR_UNUSED;
|
| 622 |
|
|
/* this is as close to the truth as we can get ... */
|
| 623 |
|
|
inode->i_blksize = MSDOS_SB(sb)->cluster_size*SECTOR_SIZE;
|
| 624 |
|
|
inode->i_blocks = (inode->i_size+inode->i_blksize-1)/
|
| 625 |
|
|
inode->i_blksize*MSDOS_SB(sb)->cluster_size;
|
| 626 |
|
|
inode->i_mtime = inode->i_atime =
|
| 627 |
|
|
date_dos2unix(CF_LE_W(raw_entry->time),CF_LE_W(raw_entry->date));
|
| 628 |
|
|
inode->i_ctime =
|
| 629 |
|
|
MSDOS_SB(sb)->options.isvfat
|
| 630 |
|
|
? date_dos2unix(CF_LE_W(raw_entry->ctime),CF_LE_W(raw_entry->cdate))
|
| 631 |
|
|
: inode->i_mtime;
|
| 632 |
|
|
fat_brelse(sb, bh);
|
| 633 |
|
|
}
|
| 634 |
|
|
|
| 635 |
|
|
|
| 636 |
|
|
void fat_write_inode(struct inode *inode)
|
| 637 |
|
|
{
|
| 638 |
|
|
struct super_block *sb = inode->i_sb;
|
| 639 |
|
|
struct buffer_head *bh;
|
| 640 |
|
|
struct msdos_dir_entry *raw_entry;
|
| 641 |
|
|
struct inode *linked;
|
| 642 |
|
|
|
| 643 |
|
|
linked = MSDOS_I(inode)->i_linked;
|
| 644 |
|
|
if (linked) {
|
| 645 |
|
|
if (MSDOS_I(linked)->i_oldlink != inode) {
|
| 646 |
|
|
printk("Invalid link (0x%p): expected 0x%p, got 0x%p\n",
|
| 647 |
|
|
linked, inode, MSDOS_I(linked)->i_oldlink);
|
| 648 |
|
|
fat_fs_panic(sb,"...");
|
| 649 |
|
|
return;
|
| 650 |
|
|
}
|
| 651 |
|
|
linked->i_version = ++event;
|
| 652 |
|
|
linked->i_mode = inode->i_mode;
|
| 653 |
|
|
linked->i_uid = inode->i_uid;
|
| 654 |
|
|
linked->i_gid = inode->i_gid;
|
| 655 |
|
|
linked->i_size = inode->i_size;
|
| 656 |
|
|
linked->i_atime = inode->i_atime;
|
| 657 |
|
|
linked->i_mtime = inode->i_mtime;
|
| 658 |
|
|
linked->i_ctime = inode->i_ctime;
|
| 659 |
|
|
linked->i_blocks = inode->i_blocks;
|
| 660 |
|
|
linked->i_atime = inode->i_atime;
|
| 661 |
|
|
MSDOS_I(linked)->i_attrs = MSDOS_I(inode)->i_attrs;
|
| 662 |
|
|
linked->i_dirt = 1;
|
| 663 |
|
|
}
|
| 664 |
|
|
|
| 665 |
|
|
inode->i_dirt = 0;
|
| 666 |
|
|
if (inode->i_ino == MSDOS_ROOT_INO || !inode->i_nlink) return;
|
| 667 |
|
|
if (!(bh = fat_bread(sb, inode->i_ino >> MSDOS_DPB_BITS))) {
|
| 668 |
|
|
printk("dev = %s, ino = %ld\n",
|
| 669 |
|
|
kdevname(inode->i_dev), inode->i_ino);
|
| 670 |
|
|
panic("msdos_write_inode: unable to read i-node block");
|
| 671 |
|
|
}
|
| 672 |
|
|
raw_entry = &((struct msdos_dir_entry *) (bh->b_data))
|
| 673 |
|
|
[inode->i_ino & (MSDOS_DPB-1)];
|
| 674 |
|
|
if (S_ISDIR(inode->i_mode)) {
|
| 675 |
|
|
raw_entry->attr = ATTR_DIR;
|
| 676 |
|
|
raw_entry->size = 0;
|
| 677 |
|
|
}
|
| 678 |
|
|
else {
|
| 679 |
|
|
raw_entry->attr = ATTR_NONE;
|
| 680 |
|
|
raw_entry->size = CT_LE_L(inode->i_size);
|
| 681 |
|
|
}
|
| 682 |
|
|
raw_entry->attr |= MSDOS_MKATTR(inode->i_mode) |
|
| 683 |
|
|
MSDOS_I(inode)->i_attrs;
|
| 684 |
|
|
raw_entry->start = CT_LE_W(MSDOS_I(inode)->i_logstart);
|
| 685 |
|
|
raw_entry->starthi = CT_LE_W(MSDOS_I(inode)->i_logstart >> 16);
|
| 686 |
|
|
fat_date_unix2dos(inode->i_mtime,&raw_entry->time,&raw_entry->date);
|
| 687 |
|
|
raw_entry->time = CT_LE_W(raw_entry->time);
|
| 688 |
|
|
raw_entry->date = CT_LE_W(raw_entry->date);
|
| 689 |
|
|
if (MSDOS_SB(sb)->options.isvfat) {
|
| 690 |
|
|
fat_date_unix2dos(inode->i_ctime,&raw_entry->ctime,&raw_entry->cdate);
|
| 691 |
|
|
raw_entry->ctime = CT_LE_W(raw_entry->ctime);
|
| 692 |
|
|
raw_entry->cdate = CT_LE_W(raw_entry->cdate);
|
| 693 |
|
|
}
|
| 694 |
|
|
fat_mark_buffer_dirty(sb, bh, 1);
|
| 695 |
|
|
fat_brelse(sb, bh);
|
| 696 |
|
|
}
|
| 697 |
|
|
|
| 698 |
|
|
|
| 699 |
|
|
int fat_notify_change(struct inode * inode,struct iattr * attr)
|
| 700 |
|
|
{
|
| 701 |
|
|
struct super_block *sb = inode->i_sb;
|
| 702 |
|
|
int error;
|
| 703 |
|
|
|
| 704 |
|
|
error = inode_change_ok(inode, attr);
|
| 705 |
|
|
if (error)
|
| 706 |
|
|
return MSDOS_SB(sb)->options.quiet ? 0 : error;
|
| 707 |
|
|
|
| 708 |
|
|
if (((attr->ia_valid & ATTR_UID) &&
|
| 709 |
|
|
(attr->ia_uid != MSDOS_SB(sb)->options.fs_uid)) ||
|
| 710 |
|
|
((attr->ia_valid & ATTR_GID) &&
|
| 711 |
|
|
(attr->ia_gid != MSDOS_SB(sb)->options.fs_gid)) ||
|
| 712 |
|
|
((attr->ia_valid & ATTR_MODE) &&
|
| 713 |
|
|
(attr->ia_mode & ~MSDOS_VALID_MODE)))
|
| 714 |
|
|
error = -EPERM;
|
| 715 |
|
|
|
| 716 |
|
|
if (error)
|
| 717 |
|
|
return MSDOS_SB(sb)->options.quiet ? 0 : error;
|
| 718 |
|
|
|
| 719 |
|
|
inode_setattr(inode, attr);
|
| 720 |
|
|
|
| 721 |
|
|
if (IS_NOEXEC(inode) && !S_ISDIR(inode->i_mode))
|
| 722 |
|
|
inode->i_mode &= S_IFMT | S_IRUGO | S_IWUGO;
|
| 723 |
|
|
else
|
| 724 |
|
|
inode->i_mode |= S_IXUGO;
|
| 725 |
|
|
|
| 726 |
|
|
inode->i_mode = ((inode->i_mode & S_IFMT) | ((((inode->i_mode & S_IRWXU
|
| 727 |
|
|
& ~MSDOS_SB(sb)->options.fs_umask) | S_IRUSR) >> 6)*S_IXUGO)) &
|
| 728 |
|
|
~MSDOS_SB(sb)->options.fs_umask;
|
| 729 |
|
|
return 0;
|
| 730 |
|
|
}
|
| 731 |
|
|
|
| 732 |
|
|
|
| 733 |
|
|
#ifdef MODULE
|
| 734 |
|
|
int init_module(void)
|
| 735 |
|
|
{
|
| 736 |
|
|
return init_fat_fs();
|
| 737 |
|
|
}
|
| 738 |
|
|
|
| 739 |
|
|
|
| 740 |
|
|
void cleanup_module(void)
|
| 741 |
|
|
{
|
| 742 |
|
|
/* Nothing to be done, really! */
|
| 743 |
|
|
return;
|
| 744 |
|
|
}
|
| 745 |
|
|
#endif
|
| 746 |
|
|
|
