| 1 |
199 |
simons |
/*
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| 2 |
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* linux/fs/fat/dir.c
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| 3 |
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*
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| 4 |
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* directory handling functions for fat-based filesystems
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*
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* Written 1992,1993 by Werner Almesberger
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*
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* Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
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| 9 |
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*
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| 10 |
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* VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
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* Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
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| 12 |
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*/
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| 14 |
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#define ASC_LINUX_VERSION(V, P, S) (((V) * 65536) + ((P) * 256) + (S))
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| 15 |
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| 16 |
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#include <linux/version.h>
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| 17 |
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#include <linux/fs.h>
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| 18 |
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#include <linux/msdos_fs.h>
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| 19 |
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#include <linux/nls.h>
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| 20 |
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#include <linux/kernel.h>
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| 21 |
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#include <linux/errno.h>
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| 22 |
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#include <linux/stat.h>
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| 23 |
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#include <linux/string.h>
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| 24 |
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#include <linux/ioctl.h>
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| 25 |
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#include <linux/dirent.h>
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| 26 |
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#include <linux/mm.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)
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| 29 |
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#include <asm/uaccess.h>
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| 30 |
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#define FAT_GET_USER(len, addr) get_user(len, addr)
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| 31 |
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#define FAT_COPY_TO_USER(uaddr, kaddr, len) copy_to_user(uaddr, kaddr, len)
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| 32 |
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#else
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| 33 |
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#include <asm/segment.h>
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| 34 |
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#define FAT_GET_USER(len, addr) (len) = get_user(addr)
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| 35 |
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#define FAT_COPY_TO_USER(uaddr, kaddr, len) memcpy_tofs(uaddr, kaddr, len)
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#endif
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| 37 |
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#include "msbuffer.h"
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| 41 |
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#define PRINTK(X)
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| 44 |
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#if LINUX_VERSION_CODE >= ASC_LINUX_VERSION(2,1,0)
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| 45 |
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static long fat_dir_read(struct inode * inode,struct file * filp,
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| 46 |
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char * buf,unsigned long count)
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| 47 |
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#else
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| 48 |
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static int fat_dir_read(struct inode * inode,struct file * filp, char * buf,int count)
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#endif
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| 50 |
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{
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| 51 |
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return -EISDIR;
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| 52 |
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}
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| 53 |
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| 54 |
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struct file_operations fat_dir_operations = {
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NULL, /* lseek - default */
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| 56 |
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fat_dir_read, /* read */
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| 57 |
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NULL, /* write - bad */
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| 58 |
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fat_readdir, /* readdir */
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NULL, /* select v2.0.x/poll v2.1.x - default */
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fat_dir_ioctl, /* ioctl - default */
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| 61 |
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NULL, /* mmap */
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NULL, /* no special open code */
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| 63 |
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NULL, /* no special release code */
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| 64 |
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file_fsync /* fsync */
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| 65 |
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};
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| 66 |
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| 67 |
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/*
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| 68 |
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* Convert Unicode 16 to UTF8, translated unicode, or ascii.
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| 69 |
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* If uni_xlate is enabled and we
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| 70 |
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* can't get a 1:1 conversion, use a colon as an escape character since
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| 71 |
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* it is normally invalid on the vfat filesystem. The following three
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| 72 |
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* characters are a sort of uuencoded 16 bit Unicode value. This lets
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| 73 |
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* us do a full dump and restore of Unicode filenames. We could get
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| 74 |
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* into some trouble with long Unicode names, but ignore that right now.
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| 75 |
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*/
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static int
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| 77 |
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uni16_to_x8(unsigned char *ascii, unsigned char *uni, int uni_xlate,
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| 78 |
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struct nls_table *nls)
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| 79 |
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{
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| 80 |
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unsigned char *ip, *op;
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| 81 |
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unsigned char ch, cl;
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| 82 |
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unsigned char *uni_page;
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| 83 |
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unsigned short val;
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| 84 |
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| 85 |
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ip = uni;
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| 86 |
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op = ascii;
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| 87 |
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| 88 |
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while (*ip || ip[1]) {
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| 89 |
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cl = *ip++;
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| 90 |
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ch = *ip++;
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| 91 |
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| 92 |
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uni_page = nls->page_uni2charset[ch];
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| 93 |
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if (uni_page && uni_page[cl]) {
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| 94 |
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*op++ = uni_page[cl];
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| 95 |
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} else {
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| 96 |
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if (uni_xlate == 1) {
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| 97 |
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*op++ = ':';
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| 98 |
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val = (cl << 8) + ch;
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| 99 |
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op[2] = fat_uni2esc[val & 0x3f];
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| 100 |
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val >>= 6;
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| 101 |
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op[1] = fat_uni2esc[val & 0x3f];
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| 102 |
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val >>= 6;
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| 103 |
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*op = fat_uni2esc[val & 0x3f];
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| 104 |
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op += 3;
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| 105 |
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} else {
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| 106 |
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*op++ = '?';
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| 107 |
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}
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| 108 |
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}
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| 109 |
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}
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| 110 |
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*op = 0;
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| 111 |
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return (op - ascii);
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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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int fat_readdirx(
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| 116 |
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struct inode *inode,
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| 117 |
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struct file *filp,
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| 118 |
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void *dirent,
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| 119 |
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fat_filldir_t fat_filldir,
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| 120 |
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filldir_t filldir,
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| 121 |
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int shortnames,
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| 122 |
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int longnames,
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int both)
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| 124 |
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{
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| 125 |
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struct super_block *sb = inode->i_sb;
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| 126 |
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int ino,i,i2,last;
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| 127 |
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char c;
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| 128 |
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struct buffer_head *bh;
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| 129 |
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struct msdos_dir_entry *de;
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| 130 |
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unsigned long oldpos = filp->f_pos;
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| 131 |
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unsigned long spos;
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| 132 |
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int is_long;
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| 133 |
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char longname[275];
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| 134 |
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unsigned char long_len = 0; /* Make compiler warning go away */
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| 135 |
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unsigned char alias_checksum = 0; /* Make compiler warning go away */
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| 136 |
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unsigned char long_slots = 0;
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| 137 |
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int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate;
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| 138 |
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int utf8 = MSDOS_SB(sb)->options.utf8;
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| 139 |
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unsigned char *unicode = NULL;
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| 140 |
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struct nls_table *nls = MSDOS_SB(sb)->nls_io;
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| 141 |
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| 142 |
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if (!inode || !S_ISDIR(inode->i_mode))
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| 143 |
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return -EBADF;
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| 144 |
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/* Fake . and .. for the root directory. */
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| 145 |
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if (inode->i_ino == MSDOS_ROOT_INO) {
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| 146 |
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while (oldpos < 2) {
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| 147 |
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if (fat_filldir(filldir, dirent, "..", oldpos+1, 0, oldpos, oldpos, 0, MSDOS_ROOT_INO) < 0)
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| 148 |
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return 0;
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| 149 |
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oldpos++;
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| 150 |
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filp->f_pos++;
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| 151 |
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}
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| 152 |
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if (oldpos == 2)
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filp->f_pos = 0;
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| 154 |
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}
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| 155 |
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if (filp->f_pos & (sizeof(struct msdos_dir_entry)-1))
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| 156 |
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return -ENOENT;
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| 157 |
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| 158 |
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bh = NULL;
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| 159 |
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longname[0] = longname[1] = 0;
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| 160 |
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is_long = 0;
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| 161 |
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ino = fat_get_entry(inode,&filp->f_pos,&bh,&de);
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| 162 |
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while (ino > -1) {
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| 163 |
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/* Check for long filename entry */
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| 164 |
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if (MSDOS_SB(sb)->options.isvfat && (de->name[0] == (__s8) DELETED_FLAG)) {
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| 165 |
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is_long = 0;
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| 166 |
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oldpos = filp->f_pos;
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| 167 |
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} else if (MSDOS_SB(sb)->options.isvfat && de->attr == ATTR_EXT) {
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| 168 |
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int get_new_entry;
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| 169 |
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struct msdos_dir_slot *ds;
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| 170 |
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int offset;
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| 171 |
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unsigned char id;
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| 172 |
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unsigned char slot;
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| 173 |
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unsigned char slots = 0;
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| 174 |
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| 175 |
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if (!unicode) {
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| 176 |
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unicode = (unsigned char *)
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| 177 |
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__get_free_page(GFP_KERNEL);
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| 178 |
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if (!unicode)
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| 179 |
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return -ENOMEM;
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| 180 |
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}
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| 181 |
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| 182 |
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offset = 0;
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| 183 |
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ds = (struct msdos_dir_slot *) de;
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| 184 |
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id = ds->id;
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| 185 |
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if (id & 0x40) {
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| 186 |
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slots = id & ~0x40;
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| 187 |
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long_slots = slots;
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| 188 |
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is_long = 1;
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| 189 |
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alias_checksum = ds->alias_checksum;
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| 190 |
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}
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| 191 |
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| 192 |
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get_new_entry = 1;
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| 193 |
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slot = slots;
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| 194 |
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while (slot > 0) {
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| 195 |
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PRINTK(("1. get_new_entry: %d\n", get_new_entry));
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| 196 |
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if (ds->attr != ATTR_EXT) {
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| 197 |
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is_long = 0;
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| 198 |
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get_new_entry = 0;
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| 199 |
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break;
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| 200 |
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}
|
| 201 |
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if ((ds->id & ~0x40) != slot) {
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| 202 |
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is_long = 0;
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| 203 |
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break;
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| 204 |
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}
|
| 205 |
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if (ds->alias_checksum != alias_checksum) {
|
| 206 |
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is_long = 0;
|
| 207 |
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break;
|
| 208 |
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}
|
| 209 |
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slot--;
|
| 210 |
|
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offset = slot * 26;
|
| 211 |
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PRINTK(("2. get_new_entry: %d\n", get_new_entry));
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| 212 |
|
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memcpy(&unicode[offset], ds->name0_4, 10);
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| 213 |
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offset += 10;
|
| 214 |
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memcpy(&unicode[offset], ds->name5_10, 12);
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| 215 |
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offset += 12;
|
| 216 |
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memcpy(&unicode[offset], ds->name11_12, 4);
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| 217 |
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offset += 4;
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| 218 |
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| 219 |
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if (ds->id & 0x40) {
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| 220 |
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unicode[offset] = 0;
|
| 221 |
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unicode[offset+1] = 0;
|
| 222 |
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}
|
| 223 |
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if (slot > 0) {
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| 224 |
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ino = fat_get_entry(inode,&filp->f_pos,&bh,&de);
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| 225 |
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PRINTK(("4. get_new_entry: %d\n", get_new_entry));
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| 226 |
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if (ino == -1) {
|
| 227 |
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is_long = 0;
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| 228 |
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get_new_entry = 0;
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| 229 |
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break;
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| 230 |
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}
|
| 231 |
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ds = (struct msdos_dir_slot *) de;
|
| 232 |
|
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}
|
| 233 |
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PRINTK(("5. get_new_entry: %d\n", get_new_entry));
|
| 234 |
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}
|
| 235 |
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} else if (!IS_FREE(de->name) && !(de->attr & ATTR_VOLUME)) {
|
| 236 |
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char bufname[14];
|
| 237 |
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char *ptname = bufname;
|
| 238 |
|
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int dotoffset = 0;
|
| 239 |
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int was_long = is_long;
|
| 240 |
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|
| 241 |
|
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if (is_long) {
|
| 242 |
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unsigned char sum;
|
| 243 |
|
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for (sum = 0, i = 0; i < 11; i++) {
|
| 244 |
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sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
|
| 245 |
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}
|
| 246 |
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|
| 247 |
|
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if (sum != alias_checksum) {
|
| 248 |
|
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PRINTK(("Checksums don't match %d != %d\n", sum, alias_checksum));
|
| 249 |
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is_long = 0;
|
| 250 |
|
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}
|
| 251 |
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if (utf8) {
|
| 252 |
|
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long_len = utf8_wcstombs(longname, (__u16 *) unicode, sizeof(longname));
|
| 253 |
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} else {
|
| 254 |
|
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long_len = uni16_to_x8(longname, unicode, uni_xlate, nls);
|
| 255 |
|
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}
|
| 256 |
|
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}
|
| 257 |
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|
| 258 |
|
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if ((de->attr & ATTR_HIDDEN) && MSDOS_SB(sb)->options.dotsOK) {
|
| 259 |
|
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bufname[0] = '.';
|
| 260 |
|
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dotoffset = 1;
|
| 261 |
|
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ptname = bufname+1;
|
| 262 |
|
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}
|
| 263 |
|
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for (i = 0, last = 0; i < 8; i++) {
|
| 264 |
|
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if (!(c = de->name[i])) break;
|
| 265 |
|
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if (c >= 'A' && c <= 'Z') c += 32;
|
| 266 |
|
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/* see namei.c, msdos_format_name */
|
| 267 |
|
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if (c == 0x05) c = 0xE5;
|
| 268 |
|
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if (c != ' ')
|
| 269 |
|
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last = i+1;
|
| 270 |
|
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ptname[i] = c;
|
| 271 |
|
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}
|
| 272 |
|
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i = last;
|
| 273 |
|
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ptname[i] = '.';
|
| 274 |
|
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i++;
|
| 275 |
|
|
for (i2 = 0; i2 < 3; i2++) {
|
| 276 |
|
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if (!(c = de->ext[i2])) break;
|
| 277 |
|
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if (c >= 'A' && c <= 'Z') c += 32;
|
| 278 |
|
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if (c != ' ')
|
| 279 |
|
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last = i+1;
|
| 280 |
|
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ptname[i] = c;
|
| 281 |
|
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i++;
|
| 282 |
|
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}
|
| 283 |
|
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if ((i = last) != 0) {
|
| 284 |
|
|
if (!strcmp(de->name,MSDOS_DOT))
|
| 285 |
|
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ino = inode->i_ino;
|
| 286 |
|
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else if (!strcmp(de->name,MSDOS_DOTDOT))
|
| 287 |
|
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ino = fat_parent_ino(inode,0);
|
| 288 |
|
|
|
| 289 |
|
|
if (shortnames || !is_long) {
|
| 290 |
|
|
dcache_add(inode, bufname, i+dotoffset, ino);
|
| 291 |
|
|
if (both) {
|
| 292 |
|
|
bufname[i+dotoffset] = '\0';
|
| 293 |
|
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}
|
| 294 |
|
|
spos = oldpos;
|
| 295 |
|
|
if (was_long) {
|
| 296 |
|
|
spos = filp->f_pos - sizeof(struct msdos_dir_entry);
|
| 297 |
|
|
} else {
|
| 298 |
|
|
long_slots = 0;
|
| 299 |
|
|
}
|
| 300 |
|
|
if (fat_filldir(filldir, dirent, bufname, i+dotoffset, 0, oldpos, spos, long_slots, ino) < 0) {
|
| 301 |
|
|
filp->f_pos = oldpos;
|
| 302 |
|
|
break;
|
| 303 |
|
|
}
|
| 304 |
|
|
}
|
| 305 |
|
|
if (is_long && longnames) {
|
| 306 |
|
|
dcache_add(inode, longname, long_len, ino);
|
| 307 |
|
|
if (both) {
|
| 308 |
|
|
memcpy(&longname[long_len+1], bufname, i+dotoffset);
|
| 309 |
|
|
long_len += i+dotoffset;
|
| 310 |
|
|
}
|
| 311 |
|
|
spos = filp->f_pos - sizeof(struct msdos_dir_entry);
|
| 312 |
|
|
if (fat_filldir(filldir, dirent, longname, long_len, 1, oldpos, spos, long_slots, ino) < 0) {
|
| 313 |
|
|
filp->f_pos = oldpos;
|
| 314 |
|
|
break;
|
| 315 |
|
|
}
|
| 316 |
|
|
}
|
| 317 |
|
|
oldpos = filp->f_pos;
|
| 318 |
|
|
}
|
| 319 |
|
|
is_long = 0;
|
| 320 |
|
|
} else {
|
| 321 |
|
|
is_long = 0;
|
| 322 |
|
|
oldpos = filp->f_pos;
|
| 323 |
|
|
}
|
| 324 |
|
|
ino = fat_get_entry(inode,&filp->f_pos,&bh,&de);
|
| 325 |
|
|
}
|
| 326 |
|
|
if (bh)
|
| 327 |
|
|
fat_brelse(sb, bh);
|
| 328 |
|
|
if (unicode) {
|
| 329 |
|
|
free_page((unsigned long) unicode);
|
| 330 |
|
|
}
|
| 331 |
|
|
return 0;
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
static int fat_filldir(
|
| 335 |
|
|
filldir_t filldir,
|
| 336 |
|
|
void * buf,
|
| 337 |
|
|
const char * name,
|
| 338 |
|
|
int name_len,
|
| 339 |
|
|
int is_long,
|
| 340 |
|
|
off_t offset,
|
| 341 |
|
|
off_t short_offset,
|
| 342 |
|
|
int long_slots,
|
| 343 |
|
|
ino_t ino)
|
| 344 |
|
|
{
|
| 345 |
|
|
return filldir(buf, name, name_len, offset, ino);
|
| 346 |
|
|
}
|
| 347 |
|
|
|
| 348 |
|
|
int fat_readdir(
|
| 349 |
|
|
struct inode *inode,
|
| 350 |
|
|
struct file *filp,
|
| 351 |
|
|
void *dirent,
|
| 352 |
|
|
filldir_t filldir)
|
| 353 |
|
|
{
|
| 354 |
|
|
return fat_readdirx(inode, filp, dirent, fat_filldir, filldir,
|
| 355 |
|
|
0, 1, 0);
|
| 356 |
|
|
}
|
| 357 |
|
|
|
| 358 |
|
|
static int vfat_ioctl_fill(
|
| 359 |
|
|
filldir_t filldir,
|
| 360 |
|
|
void * buf,
|
| 361 |
|
|
const char * name,
|
| 362 |
|
|
int name_len,
|
| 363 |
|
|
int is_long,
|
| 364 |
|
|
off_t offset,
|
| 365 |
|
|
off_t short_offset,
|
| 366 |
|
|
int long_slots,
|
| 367 |
|
|
ino_t ino)
|
| 368 |
|
|
{
|
| 369 |
|
|
struct dirent *d1 = (struct dirent *)buf;
|
| 370 |
|
|
struct dirent *d2 = d1 + 1;
|
| 371 |
|
|
int len, slen;
|
| 372 |
|
|
int dotdir;
|
| 373 |
|
|
|
| 374 |
|
|
FAT_GET_USER(len, &d1->d_reclen);
|
| 375 |
|
|
if (len != 0) {
|
| 376 |
|
|
return -1;
|
| 377 |
|
|
}
|
| 378 |
|
|
|
| 379 |
|
|
if ((name_len == 1 && name[0] == '.') ||
|
| 380 |
|
|
(name_len == 2 && name[0] == '.' && name[1] == '.')) {
|
| 381 |
|
|
dotdir = 1;
|
| 382 |
|
|
len = name_len;
|
| 383 |
|
|
} else {
|
| 384 |
|
|
dotdir = 0;
|
| 385 |
|
|
len = strlen(name);
|
| 386 |
|
|
}
|
| 387 |
|
|
if (len != name_len) {
|
| 388 |
|
|
FAT_COPY_TO_USER(d2->d_name, name, len);
|
| 389 |
|
|
put_user(0, d2->d_name + len);
|
| 390 |
|
|
put_user(len, &d2->d_reclen);
|
| 391 |
|
|
put_user(ino, &d2->d_ino);
|
| 392 |
|
|
put_user(offset, &d2->d_off);
|
| 393 |
|
|
slen = name_len - len;
|
| 394 |
|
|
FAT_COPY_TO_USER(d1->d_name, name+len+1, slen);
|
| 395 |
|
|
put_user(0, d1->d_name+slen);
|
| 396 |
|
|
put_user(slen, &d1->d_reclen);
|
| 397 |
|
|
} else {
|
| 398 |
|
|
put_user(0, d2->d_name);
|
| 399 |
|
|
put_user(0, &d2->d_reclen);
|
| 400 |
|
|
FAT_COPY_TO_USER(d1->d_name, name, len);
|
| 401 |
|
|
put_user(0, d1->d_name+len);
|
| 402 |
|
|
put_user(len, &d1->d_reclen);
|
| 403 |
|
|
}
|
| 404 |
|
|
PRINTK(("FAT d1=%p d2=%p len=%d, name_len=%d\n",
|
| 405 |
|
|
d1, d2, len, name_len));
|
| 406 |
|
|
|
| 407 |
|
|
return 0;
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
int fat_dir_ioctl(struct inode * inode, struct file * filp,
|
| 411 |
|
|
unsigned int cmd, unsigned long arg)
|
| 412 |
|
|
{
|
| 413 |
|
|
int err;
|
| 414 |
|
|
/*
|
| 415 |
|
|
* We want to provide an interface for Samba to be able
|
| 416 |
|
|
* to get the short filename for a given long filename.
|
| 417 |
|
|
* Samba should use this ioctl instead of readdir() to
|
| 418 |
|
|
* get the information it needs.
|
| 419 |
|
|
*/
|
| 420 |
|
|
switch (cmd) {
|
| 421 |
|
|
case VFAT_IOCTL_READDIR_BOTH: {
|
| 422 |
|
|
struct dirent *d1 = (struct dirent *)arg;
|
| 423 |
|
|
err = verify_area(VERIFY_WRITE, d1, sizeof(struct dirent[2]));
|
| 424 |
|
|
if (err)
|
| 425 |
|
|
return err;
|
| 426 |
|
|
put_user(0, &d1->d_reclen);
|
| 427 |
|
|
return fat_readdirx(inode,filp,(void *)arg,
|
| 428 |
|
|
vfat_ioctl_fill, NULL, 0, 1, 1);
|
| 429 |
|
|
}
|
| 430 |
|
|
case VFAT_IOCTL_READDIR_SHORT: {
|
| 431 |
|
|
struct dirent *d1 = (struct dirent *)arg;
|
| 432 |
|
|
err = verify_area(VERIFY_WRITE, d1, sizeof(struct dirent[2]));
|
| 433 |
|
|
if (err)
|
| 434 |
|
|
return err;
|
| 435 |
|
|
put_user(0, &d1->d_reclen);
|
| 436 |
|
|
return fat_readdirx(inode,filp,(void *)arg,
|
| 437 |
|
|
vfat_ioctl_fill, NULL, 1, 0, 1);
|
| 438 |
|
|
}
|
| 439 |
|
|
default:
|
| 440 |
|
|
return -EINVAL;
|
| 441 |
|
|
}
|
| 442 |
|
|
|
| 443 |
|
|
return 0;
|
| 444 |
|
|
}
|
| 445 |
|
|
|
| 446 |
|
|
/*
|
| 447 |
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
| 448 |
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
| 449 |
|
|
* adjust the settings for this buffer only. This must remain at the end
|
| 450 |
|
|
* of the file.
|
| 451 |
|
|
* ---------------------------------------------------------------------------
|
| 452 |
|
|
* Local variables:
|
| 453 |
|
|
* c-indent-level: 8
|
| 454 |
|
|
* c-brace-imaginary-offset: 0
|
| 455 |
|
|
* c-brace-offset: -8
|
| 456 |
|
|
* c-argdecl-indent: 8
|
| 457 |
|
|
* c-label-offset: -8
|
| 458 |
|
|
* c-continued-statement-offset: 8
|
| 459 |
|
|
* c-continued-brace-offset: 0
|
| 460 |
|
|
* End:
|
| 461 |
|
|
*/
|
