| 1 |
1275 |
phoenix |
/*
|
| 2 |
|
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* linux/fs/fat/dir.c
|
| 3 |
|
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*
|
| 4 |
|
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* directory handling functions for fat-based filesystems
|
| 5 |
|
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*
|
| 6 |
|
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* Written 1992,1993 by Werner Almesberger
|
| 7 |
|
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*
|
| 8 |
|
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* Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
|
| 9 |
|
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*
|
| 10 |
|
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* VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
|
| 11 |
|
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* Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
|
| 12 |
|
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* Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
|
| 13 |
|
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* Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
|
| 14 |
|
|
*/
|
| 15 |
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|
|
| 16 |
|
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#include <linux/fs.h>
|
| 17 |
|
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#include <linux/msdos_fs.h>
|
| 18 |
|
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#include <linux/nls.h>
|
| 19 |
|
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#include <linux/kernel.h>
|
| 20 |
|
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#include <linux/errno.h>
|
| 21 |
|
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#include <linux/stat.h>
|
| 22 |
|
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#include <linux/string.h>
|
| 23 |
|
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#include <linux/ioctl.h>
|
| 24 |
|
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#include <linux/dirent.h>
|
| 25 |
|
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#include <linux/mm.h>
|
| 26 |
|
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#include <linux/ctype.h>
|
| 27 |
|
|
|
| 28 |
|
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#include <asm/uaccess.h>
|
| 29 |
|
|
|
| 30 |
|
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#define PRINTK(X)
|
| 31 |
|
|
|
| 32 |
|
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struct file_operations fat_dir_operations = {
|
| 33 |
|
|
read: generic_read_dir,
|
| 34 |
|
|
readdir: fat_readdir,
|
| 35 |
|
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ioctl: fat_dir_ioctl,
|
| 36 |
|
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fsync: file_fsync,
|
| 37 |
|
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};
|
| 38 |
|
|
|
| 39 |
|
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/*
|
| 40 |
|
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* Convert Unicode 16 to UTF8, translated Unicode, or ASCII.
|
| 41 |
|
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* If uni_xlate is enabled and we can't get a 1:1 conversion, use a
|
| 42 |
|
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* colon as an escape character since it is normally invalid on the vfat
|
| 43 |
|
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* filesystem. The following four characters are the hexadecimal digits
|
| 44 |
|
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* of Unicode value. This lets us do a full dump and restore of Unicode
|
| 45 |
|
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* filenames. We could get into some trouble with long Unicode names,
|
| 46 |
|
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* but ignore that right now.
|
| 47 |
|
|
* Ahem... Stack smashing in ring 0 isn't fun. Fixed.
|
| 48 |
|
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*/
|
| 49 |
|
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static int
|
| 50 |
|
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uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
|
| 51 |
|
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struct nls_table *nls)
|
| 52 |
|
|
{
|
| 53 |
|
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wchar_t *ip, ec;
|
| 54 |
|
|
unsigned char *op, nc;
|
| 55 |
|
|
int charlen;
|
| 56 |
|
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int k;
|
| 57 |
|
|
|
| 58 |
|
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ip = uni;
|
| 59 |
|
|
op = ascii;
|
| 60 |
|
|
|
| 61 |
|
|
while (*ip) {
|
| 62 |
|
|
ec = *ip++;
|
| 63 |
|
|
if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
|
| 64 |
|
|
op += charlen;
|
| 65 |
|
|
} else {
|
| 66 |
|
|
if (uni_xlate == 1) {
|
| 67 |
|
|
*op = ':';
|
| 68 |
|
|
for (k = 4; k > 0; k--) {
|
| 69 |
|
|
nc = ec & 0xF;
|
| 70 |
|
|
op[k] = nc > 9 ? nc + ('a' - 10)
|
| 71 |
|
|
: nc + '0';
|
| 72 |
|
|
ec >>= 4;
|
| 73 |
|
|
}
|
| 74 |
|
|
op += 5;
|
| 75 |
|
|
} else {
|
| 76 |
|
|
*op++ = '?';
|
| 77 |
|
|
}
|
| 78 |
|
|
}
|
| 79 |
|
|
/* We have some slack there, so it's OK */
|
| 80 |
|
|
if (op>ascii+256) {
|
| 81 |
|
|
op = ascii + 256;
|
| 82 |
|
|
break;
|
| 83 |
|
|
}
|
| 84 |
|
|
}
|
| 85 |
|
|
*op = 0;
|
| 86 |
|
|
return (op - ascii);
|
| 87 |
|
|
}
|
| 88 |
|
|
|
| 89 |
|
|
#if 0
|
| 90 |
|
|
static void dump_de(struct msdos_dir_entry *de)
|
| 91 |
|
|
{
|
| 92 |
|
|
int i;
|
| 93 |
|
|
unsigned char *p = (unsigned char *) de;
|
| 94 |
|
|
printk("[");
|
| 95 |
|
|
|
| 96 |
|
|
for (i = 0; i < 32; i++, p++) {
|
| 97 |
|
|
printk("%02x ", *p);
|
| 98 |
|
|
}
|
| 99 |
|
|
printk("]\n");
|
| 100 |
|
|
}
|
| 101 |
|
|
#endif
|
| 102 |
|
|
|
| 103 |
|
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static inline unsigned char
|
| 104 |
|
|
fat_tolower(struct nls_table *t, unsigned char c)
|
| 105 |
|
|
{
|
| 106 |
|
|
unsigned char nc = t->charset2lower[c];
|
| 107 |
|
|
|
| 108 |
|
|
return nc ? nc : c;
|
| 109 |
|
|
}
|
| 110 |
|
|
|
| 111 |
|
|
static inline int
|
| 112 |
|
|
fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
|
| 113 |
|
|
{
|
| 114 |
|
|
int charlen;
|
| 115 |
|
|
|
| 116 |
|
|
charlen = t->char2uni(c, clen, uni);
|
| 117 |
|
|
if (charlen < 0) {
|
| 118 |
|
|
*uni = 0x003f; /* a question mark */
|
| 119 |
|
|
charlen = 1;
|
| 120 |
|
|
}
|
| 121 |
|
|
return charlen;
|
| 122 |
|
|
}
|
| 123 |
|
|
|
| 124 |
|
|
static inline int
|
| 125 |
|
|
fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
|
| 126 |
|
|
{
|
| 127 |
|
|
int charlen;
|
| 128 |
|
|
wchar_t wc;
|
| 129 |
|
|
|
| 130 |
|
|
charlen = t->char2uni(c, clen, &wc);
|
| 131 |
|
|
if (charlen < 0) {
|
| 132 |
|
|
*uni = 0x003f; /* a question mark */
|
| 133 |
|
|
charlen = 1;
|
| 134 |
|
|
} else if (charlen <= 1) {
|
| 135 |
|
|
unsigned char nc = t->charset2lower[*c];
|
| 136 |
|
|
|
| 137 |
|
|
if (!nc)
|
| 138 |
|
|
nc = *c;
|
| 139 |
|
|
|
| 140 |
|
|
if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
|
| 141 |
|
|
*uni = 0x003f; /* a question mark */
|
| 142 |
|
|
charlen = 1;
|
| 143 |
|
|
}
|
| 144 |
|
|
} else
|
| 145 |
|
|
*uni = wc;
|
| 146 |
|
|
|
| 147 |
|
|
return charlen;
|
| 148 |
|
|
}
|
| 149 |
|
|
|
| 150 |
|
|
static int
|
| 151 |
|
|
fat_strnicmp(struct nls_table *t, const unsigned char *s1,
|
| 152 |
|
|
const unsigned char *s2, int len)
|
| 153 |
|
|
{
|
| 154 |
|
|
while(len--)
|
| 155 |
|
|
if (fat_tolower(t, *s1++) != fat_tolower(t, *s2++))
|
| 156 |
|
|
return 1;
|
| 157 |
|
|
|
| 158 |
|
|
return 0;
|
| 159 |
|
|
}
|
| 160 |
|
|
|
| 161 |
|
|
static inline int
|
| 162 |
|
|
fat_shortname2uni(struct nls_table *nls, char *buf, int buf_size,
|
| 163 |
|
|
wchar_t *uni_buf, unsigned short opt, int lower)
|
| 164 |
|
|
{
|
| 165 |
|
|
int len = 0;
|
| 166 |
|
|
|
| 167 |
|
|
if (opt & VFAT_SFN_DISPLAY_LOWER)
|
| 168 |
|
|
len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
|
| 169 |
|
|
else if (opt & VFAT_SFN_DISPLAY_WIN95)
|
| 170 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 171 |
|
|
else if (opt & VFAT_SFN_DISPLAY_WINNT) {
|
| 172 |
|
|
if (lower)
|
| 173 |
|
|
len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
|
| 174 |
|
|
else
|
| 175 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 176 |
|
|
} else
|
| 177 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 178 |
|
|
|
| 179 |
|
|
return len;
|
| 180 |
|
|
}
|
| 181 |
|
|
|
| 182 |
|
|
/*
|
| 183 |
|
|
* Return values: negative -> error, 0 -> not found, positive -> found,
|
| 184 |
|
|
* value is the total amount of slots, including the shortname entry.
|
| 185 |
|
|
*/
|
| 186 |
|
|
int fat_search_long(struct inode *inode, const char *name, int name_len,
|
| 187 |
|
|
int anycase, loff_t *spos, loff_t *lpos)
|
| 188 |
|
|
{
|
| 189 |
|
|
struct super_block *sb = inode->i_sb;
|
| 190 |
|
|
struct buffer_head *bh = NULL;
|
| 191 |
|
|
struct msdos_dir_entry *de;
|
| 192 |
|
|
struct nls_table *nls_io = MSDOS_SB(sb)->nls_io;
|
| 193 |
|
|
struct nls_table *nls_disk = MSDOS_SB(sb)->nls_disk;
|
| 194 |
|
|
wchar_t bufuname[14];
|
| 195 |
|
|
unsigned char xlate_len, long_slots;
|
| 196 |
|
|
wchar_t *unicode = NULL;
|
| 197 |
|
|
char work[8], bufname[260]; /* 256 + 4 */
|
| 198 |
|
|
int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate;
|
| 199 |
|
|
int utf8 = MSDOS_SB(sb)->options.utf8;
|
| 200 |
|
|
unsigned short opt_shortname = MSDOS_SB(sb)->options.shortname;
|
| 201 |
|
|
int chl, i, j, last_u, res = 0;
|
| 202 |
|
|
loff_t i_pos, cpos = 0;
|
| 203 |
|
|
|
| 204 |
|
|
while(1) {
|
| 205 |
|
|
if (fat_get_entry(inode,&cpos,&bh,&de,&i_pos) == -1)
|
| 206 |
|
|
goto EODir;
|
| 207 |
|
|
parse_record:
|
| 208 |
|
|
long_slots = 0;
|
| 209 |
|
|
if (de->name[0] == (__s8) DELETED_FLAG)
|
| 210 |
|
|
continue;
|
| 211 |
|
|
if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
|
| 212 |
|
|
continue;
|
| 213 |
|
|
if (de->attr != ATTR_EXT && IS_FREE(de->name))
|
| 214 |
|
|
continue;
|
| 215 |
|
|
if (de->attr == ATTR_EXT) {
|
| 216 |
|
|
struct msdos_dir_slot *ds;
|
| 217 |
|
|
unsigned char id;
|
| 218 |
|
|
unsigned char slot;
|
| 219 |
|
|
unsigned char slots;
|
| 220 |
|
|
unsigned char sum;
|
| 221 |
|
|
unsigned char alias_checksum;
|
| 222 |
|
|
|
| 223 |
|
|
if (!unicode) {
|
| 224 |
|
|
unicode = (wchar_t *)
|
| 225 |
|
|
__get_free_page(GFP_KERNEL);
|
| 226 |
|
|
if (!unicode) {
|
| 227 |
|
|
fat_brelse(sb, bh);
|
| 228 |
|
|
return -ENOMEM;
|
| 229 |
|
|
}
|
| 230 |
|
|
}
|
| 231 |
|
|
parse_long:
|
| 232 |
|
|
slots = 0;
|
| 233 |
|
|
ds = (struct msdos_dir_slot *) de;
|
| 234 |
|
|
id = ds->id;
|
| 235 |
|
|
if (!(id & 0x40))
|
| 236 |
|
|
continue;
|
| 237 |
|
|
slots = id & ~0x40;
|
| 238 |
|
|
if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
|
| 239 |
|
|
continue;
|
| 240 |
|
|
long_slots = slots;
|
| 241 |
|
|
alias_checksum = ds->alias_checksum;
|
| 242 |
|
|
|
| 243 |
|
|
slot = slots;
|
| 244 |
|
|
while (1) {
|
| 245 |
|
|
int offset;
|
| 246 |
|
|
|
| 247 |
|
|
slot--;
|
| 248 |
|
|
offset = slot * 13;
|
| 249 |
|
|
fat16_towchar(unicode + offset, ds->name0_4, 5);
|
| 250 |
|
|
fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
|
| 251 |
|
|
fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
|
| 252 |
|
|
|
| 253 |
|
|
if (ds->id & 0x40) {
|
| 254 |
|
|
unicode[offset + 13] = 0;
|
| 255 |
|
|
}
|
| 256 |
|
|
if (fat_get_entry(inode,&cpos,&bh,&de,&i_pos)<0)
|
| 257 |
|
|
goto EODir;
|
| 258 |
|
|
if (slot == 0)
|
| 259 |
|
|
break;
|
| 260 |
|
|
ds = (struct msdos_dir_slot *) de;
|
| 261 |
|
|
if (ds->attr != ATTR_EXT)
|
| 262 |
|
|
goto parse_record;
|
| 263 |
|
|
if ((ds->id & ~0x40) != slot)
|
| 264 |
|
|
goto parse_long;
|
| 265 |
|
|
if (ds->alias_checksum != alias_checksum)
|
| 266 |
|
|
goto parse_long;
|
| 267 |
|
|
}
|
| 268 |
|
|
if (de->name[0] == (__s8) DELETED_FLAG)
|
| 269 |
|
|
continue;
|
| 270 |
|
|
if (de->attr == ATTR_EXT)
|
| 271 |
|
|
goto parse_long;
|
| 272 |
|
|
if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
|
| 273 |
|
|
continue;
|
| 274 |
|
|
for (sum = 0, i = 0; i < 11; i++)
|
| 275 |
|
|
sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
|
| 276 |
|
|
if (sum != alias_checksum)
|
| 277 |
|
|
long_slots = 0;
|
| 278 |
|
|
}
|
| 279 |
|
|
|
| 280 |
|
|
for (i = 0; i < 8; i++) {
|
| 281 |
|
|
/* see namei.c, msdos_format_name */
|
| 282 |
|
|
if (de->name[i] == 0x05)
|
| 283 |
|
|
work[i] = 0xE5;
|
| 284 |
|
|
else
|
| 285 |
|
|
work[i] = de->name[i];
|
| 286 |
|
|
}
|
| 287 |
|
|
for (i = 0, j = 0, last_u = 0; i < 8;) {
|
| 288 |
|
|
if (!work[i]) break;
|
| 289 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
|
| 290 |
|
|
&bufuname[j++], opt_shortname,
|
| 291 |
|
|
de->lcase & CASE_LOWER_BASE);
|
| 292 |
|
|
if (chl <= 1) {
|
| 293 |
|
|
if (work[i] != ' ')
|
| 294 |
|
|
last_u = j;
|
| 295 |
|
|
} else {
|
| 296 |
|
|
last_u = j;
|
| 297 |
|
|
}
|
| 298 |
|
|
i += chl;
|
| 299 |
|
|
}
|
| 300 |
|
|
j = last_u;
|
| 301 |
|
|
fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
|
| 302 |
|
|
for (i = 0; i < 3;) {
|
| 303 |
|
|
if (!de->ext[i]) break;
|
| 304 |
|
|
chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
|
| 305 |
|
|
&bufuname[j++], opt_shortname,
|
| 306 |
|
|
de->lcase & CASE_LOWER_EXT);
|
| 307 |
|
|
if (chl <= 1) {
|
| 308 |
|
|
if (de->ext[i] != ' ')
|
| 309 |
|
|
last_u = j;
|
| 310 |
|
|
} else {
|
| 311 |
|
|
last_u = j;
|
| 312 |
|
|
}
|
| 313 |
|
|
i += chl;
|
| 314 |
|
|
}
|
| 315 |
|
|
if (!last_u)
|
| 316 |
|
|
continue;
|
| 317 |
|
|
|
| 318 |
|
|
bufuname[last_u] = 0x0000;
|
| 319 |
|
|
xlate_len = utf8
|
| 320 |
|
|
?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
|
| 321 |
|
|
:uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
|
| 322 |
|
|
if (xlate_len == name_len)
|
| 323 |
|
|
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
|
| 324 |
|
|
(anycase && !fat_strnicmp(nls_io, name, bufname,
|
| 325 |
|
|
xlate_len)))
|
| 326 |
|
|
goto Found;
|
| 327 |
|
|
|
| 328 |
|
|
if (long_slots) {
|
| 329 |
|
|
xlate_len = utf8
|
| 330 |
|
|
?utf8_wcstombs(bufname, unicode, sizeof(bufname))
|
| 331 |
|
|
:uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
|
| 332 |
|
|
if (xlate_len != name_len)
|
| 333 |
|
|
continue;
|
| 334 |
|
|
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
|
| 335 |
|
|
(anycase && !fat_strnicmp(nls_io, name, bufname,
|
| 336 |
|
|
xlate_len)))
|
| 337 |
|
|
goto Found;
|
| 338 |
|
|
}
|
| 339 |
|
|
}
|
| 340 |
|
|
|
| 341 |
|
|
Found:
|
| 342 |
|
|
res = long_slots + 1;
|
| 343 |
|
|
*spos = cpos - sizeof(struct msdos_dir_entry);
|
| 344 |
|
|
*lpos = cpos - res*sizeof(struct msdos_dir_entry);
|
| 345 |
|
|
EODir:
|
| 346 |
|
|
fat_brelse(sb, bh);
|
| 347 |
|
|
if (unicode) {
|
| 348 |
|
|
free_page((unsigned long) unicode);
|
| 349 |
|
|
}
|
| 350 |
|
|
return res;
|
| 351 |
|
|
}
|
| 352 |
|
|
|
| 353 |
|
|
static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
|
| 354 |
|
|
filldir_t filldir, int shortnames, int both)
|
| 355 |
|
|
{
|
| 356 |
|
|
struct super_block *sb = inode->i_sb;
|
| 357 |
|
|
struct buffer_head *bh;
|
| 358 |
|
|
struct msdos_dir_entry *de;
|
| 359 |
|
|
struct nls_table *nls_io = MSDOS_SB(sb)->nls_io;
|
| 360 |
|
|
struct nls_table *nls_disk = MSDOS_SB(sb)->nls_disk;
|
| 361 |
|
|
wchar_t bufuname[14];
|
| 362 |
|
|
unsigned char long_slots;
|
| 363 |
|
|
wchar_t *unicode = NULL;
|
| 364 |
|
|
char c, work[8], bufname[56], *ptname = bufname;
|
| 365 |
|
|
unsigned long lpos, dummy, *furrfu = &lpos;
|
| 366 |
|
|
int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate;
|
| 367 |
|
|
int isvfat = MSDOS_SB(sb)->options.isvfat;
|
| 368 |
|
|
int utf8 = MSDOS_SB(sb)->options.utf8;
|
| 369 |
|
|
int nocase = MSDOS_SB(sb)->options.nocase;
|
| 370 |
|
|
unsigned short opt_shortname = MSDOS_SB(sb)->options.shortname;
|
| 371 |
|
|
unsigned long inum;
|
| 372 |
|
|
int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
|
| 373 |
|
|
loff_t i_pos, cpos;
|
| 374 |
|
|
|
| 375 |
|
|
cpos = filp->f_pos;
|
| 376 |
|
|
/* Fake . and .. for the root directory. */
|
| 377 |
|
|
if (inode->i_ino == MSDOS_ROOT_INO) {
|
| 378 |
|
|
while (cpos < 2) {
|
| 379 |
|
|
if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
|
| 380 |
|
|
return 0;
|
| 381 |
|
|
cpos++;
|
| 382 |
|
|
filp->f_pos++;
|
| 383 |
|
|
}
|
| 384 |
|
|
if (cpos == 2) {
|
| 385 |
|
|
dummy = 2;
|
| 386 |
|
|
furrfu = &dummy;
|
| 387 |
|
|
cpos = 0;
|
| 388 |
|
|
}
|
| 389 |
|
|
}
|
| 390 |
|
|
if (cpos & (sizeof(struct msdos_dir_entry)-1))
|
| 391 |
|
|
return -ENOENT;
|
| 392 |
|
|
|
| 393 |
|
|
bh = NULL;
|
| 394 |
|
|
GetNew:
|
| 395 |
|
|
long_slots = 0;
|
| 396 |
|
|
if (fat_get_entry(inode,&cpos,&bh,&de,&i_pos) == -1)
|
| 397 |
|
|
goto EODir;
|
| 398 |
|
|
/* Check for long filename entry */
|
| 399 |
|
|
if (isvfat) {
|
| 400 |
|
|
if (de->name[0] == (__s8) DELETED_FLAG)
|
| 401 |
|
|
goto RecEnd;
|
| 402 |
|
|
if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
|
| 403 |
|
|
goto RecEnd;
|
| 404 |
|
|
if (de->attr != ATTR_EXT && IS_FREE(de->name))
|
| 405 |
|
|
goto RecEnd;
|
| 406 |
|
|
} else {
|
| 407 |
|
|
if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
|
| 408 |
|
|
goto RecEnd;
|
| 409 |
|
|
}
|
| 410 |
|
|
|
| 411 |
|
|
if (isvfat && de->attr == ATTR_EXT) {
|
| 412 |
|
|
struct msdos_dir_slot *ds;
|
| 413 |
|
|
unsigned char id;
|
| 414 |
|
|
unsigned char slot;
|
| 415 |
|
|
unsigned char slots;
|
| 416 |
|
|
unsigned char sum;
|
| 417 |
|
|
unsigned char alias_checksum;
|
| 418 |
|
|
|
| 419 |
|
|
if (!unicode) {
|
| 420 |
|
|
unicode = (wchar_t *)
|
| 421 |
|
|
__get_free_page(GFP_KERNEL);
|
| 422 |
|
|
if (!unicode) {
|
| 423 |
|
|
filp->f_pos = cpos;
|
| 424 |
|
|
fat_brelse(sb, bh);
|
| 425 |
|
|
return -ENOMEM;
|
| 426 |
|
|
}
|
| 427 |
|
|
}
|
| 428 |
|
|
ParseLong:
|
| 429 |
|
|
slots = 0;
|
| 430 |
|
|
ds = (struct msdos_dir_slot *) de;
|
| 431 |
|
|
id = ds->id;
|
| 432 |
|
|
if (!(id & 0x40))
|
| 433 |
|
|
goto RecEnd;
|
| 434 |
|
|
slots = id & ~0x40;
|
| 435 |
|
|
if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
|
| 436 |
|
|
goto RecEnd;
|
| 437 |
|
|
long_slots = slots;
|
| 438 |
|
|
alias_checksum = ds->alias_checksum;
|
| 439 |
|
|
|
| 440 |
|
|
slot = slots;
|
| 441 |
|
|
while (1) {
|
| 442 |
|
|
int offset;
|
| 443 |
|
|
|
| 444 |
|
|
slot--;
|
| 445 |
|
|
offset = slot * 13;
|
| 446 |
|
|
fat16_towchar(unicode + offset, ds->name0_4, 5);
|
| 447 |
|
|
fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
|
| 448 |
|
|
fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
|
| 449 |
|
|
|
| 450 |
|
|
if (ds->id & 0x40) {
|
| 451 |
|
|
unicode[offset + 13] = 0;
|
| 452 |
|
|
}
|
| 453 |
|
|
if (fat_get_entry(inode,&cpos,&bh,&de,&i_pos) == -1)
|
| 454 |
|
|
goto EODir;
|
| 455 |
|
|
if (slot == 0)
|
| 456 |
|
|
break;
|
| 457 |
|
|
ds = (struct msdos_dir_slot *) de;
|
| 458 |
|
|
if (ds->attr != ATTR_EXT)
|
| 459 |
|
|
goto RecEnd; /* XXX */
|
| 460 |
|
|
if ((ds->id & ~0x40) != slot)
|
| 461 |
|
|
goto ParseLong;
|
| 462 |
|
|
if (ds->alias_checksum != alias_checksum)
|
| 463 |
|
|
goto ParseLong;
|
| 464 |
|
|
}
|
| 465 |
|
|
if (de->name[0] == (__s8) DELETED_FLAG)
|
| 466 |
|
|
goto RecEnd;
|
| 467 |
|
|
if (de->attr == ATTR_EXT)
|
| 468 |
|
|
goto ParseLong;
|
| 469 |
|
|
if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
|
| 470 |
|
|
goto RecEnd;
|
| 471 |
|
|
for (sum = 0, i = 0; i < 11; i++)
|
| 472 |
|
|
sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
|
| 473 |
|
|
if (sum != alias_checksum)
|
| 474 |
|
|
long_slots = 0;
|
| 475 |
|
|
}
|
| 476 |
|
|
|
| 477 |
|
|
if ((de->attr & ATTR_HIDDEN) && MSDOS_SB(sb)->options.dotsOK) {
|
| 478 |
|
|
*ptname++ = '.';
|
| 479 |
|
|
dotoffset = 1;
|
| 480 |
|
|
}
|
| 481 |
|
|
|
| 482 |
|
|
for (i = 0; i < 8; i++) {
|
| 483 |
|
|
/* see namei.c, msdos_format_name */
|
| 484 |
|
|
if (de->name[i] == 0x05)
|
| 485 |
|
|
work[i] = 0xE5;
|
| 486 |
|
|
else
|
| 487 |
|
|
work[i] = de->name[i];
|
| 488 |
|
|
}
|
| 489 |
|
|
for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
|
| 490 |
|
|
if (!(c = work[i])) break;
|
| 491 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
|
| 492 |
|
|
&bufuname[j++], opt_shortname,
|
| 493 |
|
|
de->lcase & CASE_LOWER_BASE);
|
| 494 |
|
|
if (chl <= 1) {
|
| 495 |
|
|
ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
|
| 496 |
|
|
if (c != ' ') {
|
| 497 |
|
|
last = i;
|
| 498 |
|
|
last_u = j;
|
| 499 |
|
|
}
|
| 500 |
|
|
} else {
|
| 501 |
|
|
last_u = j;
|
| 502 |
|
|
for (chi = 0; chi < chl && i < 8; chi++) {
|
| 503 |
|
|
ptname[i] = work[i];
|
| 504 |
|
|
i++; last = i;
|
| 505 |
|
|
}
|
| 506 |
|
|
}
|
| 507 |
|
|
}
|
| 508 |
|
|
i = last;
|
| 509 |
|
|
j = last_u;
|
| 510 |
|
|
fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
|
| 511 |
|
|
ptname[i++] = '.';
|
| 512 |
|
|
for (i2 = 0; i2 < 3;) {
|
| 513 |
|
|
if (!(c = de->ext[i2])) break;
|
| 514 |
|
|
chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
|
| 515 |
|
|
&bufuname[j++], opt_shortname,
|
| 516 |
|
|
de->lcase & CASE_LOWER_EXT);
|
| 517 |
|
|
if (chl <= 1) {
|
| 518 |
|
|
i2++;
|
| 519 |
|
|
ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
|
| 520 |
|
|
if (c != ' ') {
|
| 521 |
|
|
last = i;
|
| 522 |
|
|
last_u = j;
|
| 523 |
|
|
}
|
| 524 |
|
|
} else {
|
| 525 |
|
|
last_u = j;
|
| 526 |
|
|
for (chi = 0; chi < chl && i2 < 3; chi++) {
|
| 527 |
|
|
ptname[i++] = de->ext[i2++];
|
| 528 |
|
|
last = i;
|
| 529 |
|
|
}
|
| 530 |
|
|
}
|
| 531 |
|
|
}
|
| 532 |
|
|
if (!last)
|
| 533 |
|
|
goto RecEnd;
|
| 534 |
|
|
|
| 535 |
|
|
i = last + dotoffset;
|
| 536 |
|
|
j = last_u;
|
| 537 |
|
|
|
| 538 |
|
|
lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
|
| 539 |
|
|
if (!memcmp(de->name,MSDOS_DOT,11))
|
| 540 |
|
|
inum = inode->i_ino;
|
| 541 |
|
|
else if (!memcmp(de->name,MSDOS_DOTDOT,11)) {
|
| 542 |
|
|
/* inum = fat_parent_ino(inode,0); */
|
| 543 |
|
|
inum = filp->f_dentry->d_parent->d_inode->i_ino;
|
| 544 |
|
|
} else {
|
| 545 |
|
|
struct inode *tmp = fat_iget(sb, i_pos);
|
| 546 |
|
|
if (tmp) {
|
| 547 |
|
|
inum = tmp->i_ino;
|
| 548 |
|
|
iput(tmp);
|
| 549 |
|
|
} else
|
| 550 |
|
|
inum = iunique(sb, MSDOS_ROOT_INO);
|
| 551 |
|
|
}
|
| 552 |
|
|
|
| 553 |
|
|
if (isvfat) {
|
| 554 |
|
|
bufuname[j] = 0x0000;
|
| 555 |
|
|
i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
|
| 556 |
|
|
: uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
|
| 557 |
|
|
}
|
| 558 |
|
|
|
| 559 |
|
|
if (!long_slots||shortnames) {
|
| 560 |
|
|
if (both)
|
| 561 |
|
|
bufname[i] = '\0';
|
| 562 |
|
|
if (filldir(dirent, bufname, i, *furrfu, inum,
|
| 563 |
|
|
(de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
|
| 564 |
|
|
goto FillFailed;
|
| 565 |
|
|
} else {
|
| 566 |
|
|
char longname[275];
|
| 567 |
|
|
int long_len = utf8
|
| 568 |
|
|
? utf8_wcstombs(longname, unicode, sizeof(longname))
|
| 569 |
|
|
: uni16_to_x8(longname, unicode, uni_xlate,
|
| 570 |
|
|
nls_io);
|
| 571 |
|
|
if (both) {
|
| 572 |
|
|
memcpy(&longname[long_len+1], bufname, i);
|
| 573 |
|
|
long_len += i;
|
| 574 |
|
|
}
|
| 575 |
|
|
if (filldir(dirent, longname, long_len, *furrfu, inum,
|
| 576 |
|
|
(de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
|
| 577 |
|
|
goto FillFailed;
|
| 578 |
|
|
}
|
| 579 |
|
|
|
| 580 |
|
|
RecEnd:
|
| 581 |
|
|
furrfu = &lpos;
|
| 582 |
|
|
filp->f_pos = cpos;
|
| 583 |
|
|
goto GetNew;
|
| 584 |
|
|
EODir:
|
| 585 |
|
|
filp->f_pos = cpos;
|
| 586 |
|
|
FillFailed:
|
| 587 |
|
|
if (bh)
|
| 588 |
|
|
fat_brelse(sb, bh);
|
| 589 |
|
|
if (unicode) {
|
| 590 |
|
|
free_page((unsigned long) unicode);
|
| 591 |
|
|
}
|
| 592 |
|
|
return 0;
|
| 593 |
|
|
}
|
| 594 |
|
|
|
| 595 |
|
|
int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
| 596 |
|
|
{
|
| 597 |
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
| 598 |
|
|
return fat_readdirx(inode, filp, dirent, filldir, 0, 0);
|
| 599 |
|
|
}
|
| 600 |
|
|
|
| 601 |
|
|
static int vfat_ioctl_fill(
|
| 602 |
|
|
void * buf,
|
| 603 |
|
|
const char * name,
|
| 604 |
|
|
int name_len,
|
| 605 |
|
|
loff_t offset,
|
| 606 |
|
|
ino_t ino,
|
| 607 |
|
|
unsigned int d_type)
|
| 608 |
|
|
{
|
| 609 |
|
|
struct dirent *d1 = (struct dirent *)buf;
|
| 610 |
|
|
struct dirent *d2 = d1 + 1;
|
| 611 |
|
|
int len, slen;
|
| 612 |
|
|
int dotdir;
|
| 613 |
|
|
|
| 614 |
|
|
get_user(len, &d1->d_reclen);
|
| 615 |
|
|
if (len != 0) {
|
| 616 |
|
|
return -1;
|
| 617 |
|
|
}
|
| 618 |
|
|
|
| 619 |
|
|
if ((name_len == 1 && name[0] == '.') ||
|
| 620 |
|
|
(name_len == 2 && name[0] == '.' && name[1] == '.')) {
|
| 621 |
|
|
dotdir = 1;
|
| 622 |
|
|
len = name_len;
|
| 623 |
|
|
} else {
|
| 624 |
|
|
dotdir = 0;
|
| 625 |
|
|
len = strlen(name);
|
| 626 |
|
|
}
|
| 627 |
|
|
if (len != name_len) {
|
| 628 |
|
|
copy_to_user(d2->d_name, name, len);
|
| 629 |
|
|
put_user(0, d2->d_name + len);
|
| 630 |
|
|
put_user(len, &d2->d_reclen);
|
| 631 |
|
|
put_user(ino, &d2->d_ino);
|
| 632 |
|
|
put_user(offset, &d2->d_off);
|
| 633 |
|
|
slen = name_len - len;
|
| 634 |
|
|
copy_to_user(d1->d_name, name+len+1, slen);
|
| 635 |
|
|
put_user(0, d1->d_name+slen);
|
| 636 |
|
|
put_user(slen, &d1->d_reclen);
|
| 637 |
|
|
} else {
|
| 638 |
|
|
put_user(0, d2->d_name);
|
| 639 |
|
|
put_user(0, &d2->d_reclen);
|
| 640 |
|
|
copy_to_user(d1->d_name, name, len);
|
| 641 |
|
|
put_user(0, d1->d_name+len);
|
| 642 |
|
|
put_user(len, &d1->d_reclen);
|
| 643 |
|
|
}
|
| 644 |
|
|
PRINTK(("FAT d1=%p d2=%p len=%d, name_len=%d\n",
|
| 645 |
|
|
d1, d2, len, name_len));
|
| 646 |
|
|
|
| 647 |
|
|
return 0;
|
| 648 |
|
|
}
|
| 649 |
|
|
|
| 650 |
|
|
int fat_dir_ioctl(struct inode * inode, struct file * filp,
|
| 651 |
|
|
unsigned int cmd, unsigned long arg)
|
| 652 |
|
|
{
|
| 653 |
|
|
int err;
|
| 654 |
|
|
/*
|
| 655 |
|
|
* We want to provide an interface for Samba to be able
|
| 656 |
|
|
* to get the short filename for a given long filename.
|
| 657 |
|
|
* Samba should use this ioctl instead of readdir() to
|
| 658 |
|
|
* get the information it needs.
|
| 659 |
|
|
*/
|
| 660 |
|
|
switch (cmd) {
|
| 661 |
|
|
case VFAT_IOCTL_READDIR_BOTH: {
|
| 662 |
|
|
struct dirent *d1 = (struct dirent *)arg;
|
| 663 |
|
|
err = verify_area(VERIFY_WRITE, d1, sizeof(struct dirent[2]));
|
| 664 |
|
|
if (err)
|
| 665 |
|
|
return err;
|
| 666 |
|
|
put_user(0, &d1->d_reclen);
|
| 667 |
|
|
return fat_readdirx(inode,filp,(void *)arg,
|
| 668 |
|
|
vfat_ioctl_fill, 0, 1);
|
| 669 |
|
|
}
|
| 670 |
|
|
case VFAT_IOCTL_READDIR_SHORT: {
|
| 671 |
|
|
struct dirent *d1 = (struct dirent *)arg;
|
| 672 |
|
|
put_user(0, &d1->d_reclen);
|
| 673 |
|
|
err = verify_area(VERIFY_WRITE, d1, sizeof(struct dirent[2]));
|
| 674 |
|
|
if (err)
|
| 675 |
|
|
return err;
|
| 676 |
|
|
return fat_readdirx(inode,filp,(void *)arg,
|
| 677 |
|
|
vfat_ioctl_fill, 1, 1);
|
| 678 |
|
|
}
|
| 679 |
|
|
default:
|
| 680 |
|
|
/* forward ioctl to CVF extension */
|
| 681 |
|
|
if (MSDOS_SB(inode->i_sb)->cvf_format &&
|
| 682 |
|
|
MSDOS_SB(inode->i_sb)->cvf_format->cvf_dir_ioctl)
|
| 683 |
|
|
return MSDOS_SB(inode->i_sb)->cvf_format
|
| 684 |
|
|
->cvf_dir_ioctl(inode,filp,cmd,arg);
|
| 685 |
|
|
return -EINVAL;
|
| 686 |
|
|
}
|
| 687 |
|
|
|
| 688 |
|
|
return 0;
|
| 689 |
|
|
}
|
| 690 |
|
|
|
| 691 |
|
|
/***** See if directory is empty */
|
| 692 |
|
|
int fat_dir_empty(struct inode *dir)
|
| 693 |
|
|
{
|
| 694 |
|
|
loff_t pos, i_pos;
|
| 695 |
|
|
struct buffer_head *bh;
|
| 696 |
|
|
struct msdos_dir_entry *de;
|
| 697 |
|
|
int result = 0;
|
| 698 |
|
|
|
| 699 |
|
|
pos = 0;
|
| 700 |
|
|
bh = NULL;
|
| 701 |
|
|
while (fat_get_entry(dir,&pos,&bh,&de,&i_pos) > -1) {
|
| 702 |
|
|
/* Ignore vfat longname entries */
|
| 703 |
|
|
if (de->attr == ATTR_EXT)
|
| 704 |
|
|
continue;
|
| 705 |
|
|
if (!IS_FREE(de->name) &&
|
| 706 |
|
|
strncmp(de->name,MSDOS_DOT , MSDOS_NAME) &&
|
| 707 |
|
|
strncmp(de->name,MSDOS_DOTDOT, MSDOS_NAME)) {
|
| 708 |
|
|
result = -ENOTEMPTY;
|
| 709 |
|
|
break;
|
| 710 |
|
|
}
|
| 711 |
|
|
}
|
| 712 |
|
|
if (bh)
|
| 713 |
|
|
fat_brelse(dir->i_sb, bh);
|
| 714 |
|
|
|
| 715 |
|
|
return result;
|
| 716 |
|
|
}
|
| 717 |
|
|
|
| 718 |
|
|
/* This assumes that size of cluster is above the 32*slots */
|
| 719 |
|
|
|
| 720 |
|
|
int fat_add_entries(struct inode *dir,int slots, struct buffer_head **bh,
|
| 721 |
|
|
struct msdos_dir_entry **de, loff_t *i_pos)
|
| 722 |
|
|
{
|
| 723 |
|
|
struct super_block *sb = dir->i_sb;
|
| 724 |
|
|
loff_t offset, curr;
|
| 725 |
|
|
int row;
|
| 726 |
|
|
struct buffer_head *new_bh;
|
| 727 |
|
|
|
| 728 |
|
|
offset = curr = 0;
|
| 729 |
|
|
*bh = NULL;
|
| 730 |
|
|
row = 0;
|
| 731 |
|
|
while (fat_get_entry(dir,&curr,bh,de,i_pos) > -1) {
|
| 732 |
|
|
if (IS_FREE((*de)->name)) {
|
| 733 |
|
|
if (++row == slots)
|
| 734 |
|
|
return offset;
|
| 735 |
|
|
} else {
|
| 736 |
|
|
row = 0;
|
| 737 |
|
|
offset = curr;
|
| 738 |
|
|
}
|
| 739 |
|
|
}
|
| 740 |
|
|
if ((dir->i_ino == MSDOS_ROOT_INO) && (MSDOS_SB(sb)->fat_bits != 32))
|
| 741 |
|
|
return -ENOSPC;
|
| 742 |
|
|
new_bh = fat_extend_dir(dir);
|
| 743 |
|
|
if (!new_bh)
|
| 744 |
|
|
return -ENOSPC;
|
| 745 |
|
|
fat_brelse(sb, new_bh);
|
| 746 |
|
|
do fat_get_entry(dir,&curr,bh,de,i_pos); while (++row<slots);
|
| 747 |
|
|
return offset;
|
| 748 |
|
|
}
|
| 749 |
|
|
|
| 750 |
|
|
int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat)
|
| 751 |
|
|
{
|
| 752 |
|
|
struct super_block *sb = dir->i_sb;
|
| 753 |
|
|
struct buffer_head *bh;
|
| 754 |
|
|
struct msdos_dir_entry *de;
|
| 755 |
|
|
__u16 date, time;
|
| 756 |
|
|
|
| 757 |
|
|
if ((bh = fat_extend_dir(dir)) == NULL) return -ENOSPC;
|
| 758 |
|
|
/* zeroed out, so... */
|
| 759 |
|
|
fat_date_unix2dos(dir->i_mtime,&time,&date);
|
| 760 |
|
|
de = (struct msdos_dir_entry*)&bh->b_data[0];
|
| 761 |
|
|
memcpy(de[0].name,MSDOS_DOT,MSDOS_NAME);
|
| 762 |
|
|
memcpy(de[1].name,MSDOS_DOTDOT,MSDOS_NAME);
|
| 763 |
|
|
de[0].attr = de[1].attr = ATTR_DIR;
|
| 764 |
|
|
de[0].time = de[1].time = CT_LE_W(time);
|
| 765 |
|
|
de[0].date = de[1].date = CT_LE_W(date);
|
| 766 |
|
|
if (is_vfat) { /* extra timestamps */
|
| 767 |
|
|
de[0].ctime = de[1].ctime = CT_LE_W(time);
|
| 768 |
|
|
de[0].adate = de[0].cdate =
|
| 769 |
|
|
de[1].adate = de[1].cdate = CT_LE_W(date);
|
| 770 |
|
|
}
|
| 771 |
|
|
de[0].start = CT_LE_W(MSDOS_I(dir)->i_logstart);
|
| 772 |
|
|
de[0].starthi = CT_LE_W(MSDOS_I(dir)->i_logstart>>16);
|
| 773 |
|
|
de[1].start = CT_LE_W(MSDOS_I(parent)->i_logstart);
|
| 774 |
|
|
de[1].starthi = CT_LE_W(MSDOS_I(parent)->i_logstart>>16);
|
| 775 |
|
|
fat_mark_buffer_dirty(sb, bh);
|
| 776 |
|
|
fat_brelse(sb, bh);
|
| 777 |
|
|
dir->i_atime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
|
| 778 |
|
|
mark_inode_dirty(dir);
|
| 779 |
|
|
|
| 780 |
|
|
return 0;
|
| 781 |
|
|
}
|
| 782 |
|
|
|
| 783 |
|
|
/*
|
| 784 |
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
| 785 |
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
| 786 |
|
|
* adjust the settings for this buffer only. This must remain at the end
|
| 787 |
|
|
* of the file.
|
| 788 |
|
|
* ---------------------------------------------------------------------------
|
| 789 |
|
|
* Local variables:
|
| 790 |
|
|
* c-indent-level: 8
|
| 791 |
|
|
* c-brace-imaginary-offset: 0
|
| 792 |
|
|
* c-brace-offset: -8
|
| 793 |
|
|
* c-argdecl-indent: 8
|
| 794 |
|
|
* c-label-offset: -8
|
| 795 |
|
|
* c-continued-statement-offset: 8
|
| 796 |
|
|
* c-continued-brace-offset: 0
|
| 797 |
|
|
* End:
|
| 798 |
|
|
*/
|
