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b8948d2aef
get_fatent_value(...) flushes changed FAT entries to disk when fetching the next FAT blocks, in every other aspect it is identical to get_fatent(...). Provide a stub implementation for flush_dirty_fat_buffer if CONFIG_FAT_WRITE is not set. Calling flush_dirty_fat_buffer during read only operation is fine as it checks if any buffers needs flushing. Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de> Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
1091 lines
25 KiB
C
1091 lines
25 KiB
C
/*
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* fat_write.c
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*
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* R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <config.h>
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#include <fat.h>
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#include <asm/byteorder.h>
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#include <part.h>
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#include <linux/ctype.h>
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#include <div64.h>
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#include <linux/math64.h>
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#include "fat.c"
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static void uppercase(char *str, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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*str = toupper(*str);
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str++;
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}
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}
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static int total_sector;
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static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
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{
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ulong ret;
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if (!cur_dev)
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return -1;
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if (cur_part_info.start + block + nr_blocks >
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cur_part_info.start + total_sector) {
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printf("error: overflow occurs\n");
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return -1;
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}
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ret = blk_dwrite(cur_dev, cur_part_info.start + block, nr_blocks, buf);
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if (nr_blocks && ret == 0)
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return -1;
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return ret;
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}
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/*
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* Set short name in directory entry
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*/
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static void set_name(dir_entry *dirent, const char *filename)
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{
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char s_name[VFAT_MAXLEN_BYTES];
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char *period;
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int period_location, len, i, ext_num;
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if (filename == NULL)
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return;
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len = strlen(filename);
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if (len == 0)
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return;
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strcpy(s_name, filename);
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uppercase(s_name, len);
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period = strchr(s_name, '.');
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if (period == NULL) {
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period_location = len;
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ext_num = 0;
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} else {
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period_location = period - s_name;
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ext_num = len - period_location - 1;
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}
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/* Pad spaces when the length of file name is shorter than eight */
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if (period_location < 8) {
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memcpy(dirent->name, s_name, period_location);
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for (i = period_location; i < 8; i++)
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dirent->name[i] = ' ';
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} else if (period_location == 8) {
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memcpy(dirent->name, s_name, period_location);
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} else {
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memcpy(dirent->name, s_name, 6);
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dirent->name[6] = '~';
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dirent->name[7] = '1';
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}
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if (ext_num < 3) {
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memcpy(dirent->ext, s_name + period_location + 1, ext_num);
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for (i = ext_num; i < 3; i++)
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dirent->ext[i] = ' ';
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} else
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memcpy(dirent->ext, s_name + period_location + 1, 3);
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debug("name : %s\n", dirent->name);
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debug("ext : %s\n", dirent->ext);
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}
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static __u8 num_of_fats;
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/*
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* Write fat buffer into block device
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*/
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static int flush_dirty_fat_buffer(fsdata *mydata)
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{
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int getsize = FATBUFBLOCKS;
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__u32 fatlength = mydata->fatlength;
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__u8 *bufptr = mydata->fatbuf;
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__u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
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debug("debug: evicting %d, dirty: %d\n", mydata->fatbufnum,
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(int)mydata->fat_dirty);
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if ((!mydata->fat_dirty) || (mydata->fatbufnum == -1))
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return 0;
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/* Cap length if fatlength is not a multiple of FATBUFBLOCKS */
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if (startblock + getsize > fatlength)
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getsize = fatlength - startblock;
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startblock += mydata->fat_sect;
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/* Write FAT buf */
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if (disk_write(startblock, getsize, bufptr) < 0) {
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debug("error: writing FAT blocks\n");
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return -1;
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}
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if (num_of_fats == 2) {
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/* Update corresponding second FAT blocks */
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startblock += mydata->fatlength;
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if (disk_write(startblock, getsize, bufptr) < 0) {
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debug("error: writing second FAT blocks\n");
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return -1;
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}
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}
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mydata->fat_dirty = 0;
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return 0;
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}
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/*
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* Set the file name information from 'name' into 'slotptr',
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*/
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static int str2slot(dir_slot *slotptr, const char *name, int *idx)
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{
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int j, end_idx = 0;
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for (j = 0; j <= 8; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name0_4[j] = 0;
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slotptr->name0_4[j + 1] = 0;
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end_idx++;
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goto name0_4;
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}
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slotptr->name0_4[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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for (j = 0; j <= 10; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name5_10[j] = 0;
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slotptr->name5_10[j + 1] = 0;
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end_idx++;
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goto name5_10;
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}
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slotptr->name5_10[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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for (j = 0; j <= 2; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name11_12[j] = 0;
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slotptr->name11_12[j + 1] = 0;
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end_idx++;
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goto name11_12;
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}
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slotptr->name11_12[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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if (name[*idx] == 0x00)
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return 1;
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return 0;
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/* Not used characters are filled with 0xff 0xff */
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name0_4:
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for (; end_idx < 5; end_idx++) {
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slotptr->name0_4[end_idx * 2] = 0xff;
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slotptr->name0_4[end_idx * 2 + 1] = 0xff;
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}
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end_idx = 5;
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name5_10:
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end_idx -= 5;
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for (; end_idx < 6; end_idx++) {
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slotptr->name5_10[end_idx * 2] = 0xff;
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slotptr->name5_10[end_idx * 2 + 1] = 0xff;
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}
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end_idx = 11;
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name11_12:
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end_idx -= 11;
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for (; end_idx < 2; end_idx++) {
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slotptr->name11_12[end_idx * 2] = 0xff;
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slotptr->name11_12[end_idx * 2 + 1] = 0xff;
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}
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return 1;
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}
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static int is_next_clust(fsdata *mydata, dir_entry *dentptr);
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static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
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/*
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* Fill dir_slot entries with appropriate name, id, and attr
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* The real directory entry is returned by 'dentptr'
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*/
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static void
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fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
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{
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__u8 temp_dir_slot_buffer[MAX_LFN_SLOT * sizeof(dir_slot)];
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dir_slot *slotptr = (dir_slot *)temp_dir_slot_buffer;
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__u8 counter = 0, checksum;
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int idx = 0, ret;
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/* Get short file name checksum value */
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checksum = mkcksum((*dentptr)->name, (*dentptr)->ext);
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do {
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memset(slotptr, 0x00, sizeof(dir_slot));
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ret = str2slot(slotptr, l_name, &idx);
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slotptr->id = ++counter;
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slotptr->attr = ATTR_VFAT;
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slotptr->alias_checksum = checksum;
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slotptr++;
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} while (ret == 0);
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slotptr--;
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slotptr->id |= LAST_LONG_ENTRY_MASK;
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while (counter >= 1) {
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if (is_next_clust(mydata, *dentptr)) {
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/* A new cluster is allocated for directory table */
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flush_dir_table(mydata, dentptr);
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}
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memcpy(*dentptr, slotptr, sizeof(dir_slot));
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(*dentptr)++;
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slotptr--;
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counter--;
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}
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if (is_next_clust(mydata, *dentptr)) {
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/* A new cluster is allocated for directory table */
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flush_dir_table(mydata, dentptr);
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}
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}
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static __u32 dir_curclust;
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/*
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* Extract the full long filename starting at 'retdent' (which is really
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* a slot) into 'l_name'. If successful also copy the real directory entry
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* into 'retdent'
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* If additional adjacent cluster for directory entries is read into memory,
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* then 'get_contents_vfatname_block' is copied into 'get_dentfromdir_block' and
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* the location of the real directory entry is returned by 'retdent'
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* Return 0 on success, -1 otherwise.
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*/
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static int
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get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
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dir_entry **retdent, char *l_name)
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{
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dir_entry *realdent;
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dir_slot *slotptr = (dir_slot *)(*retdent);
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dir_slot *slotptr2 = NULL;
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__u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
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PREFETCH_BLOCKS :
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mydata->clust_size);
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__u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
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int idx = 0, cur_position = 0;
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if (counter > VFAT_MAXSEQ) {
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debug("Error: VFAT name is too long\n");
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return -1;
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}
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while ((__u8 *)slotptr < buflimit) {
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if (counter == 0)
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break;
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if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
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return -1;
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slotptr++;
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counter--;
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}
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if ((__u8 *)slotptr >= buflimit) {
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if (curclust == 0)
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return -1;
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curclust = get_fatent(mydata, dir_curclust);
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if (CHECK_CLUST(curclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", curclust);
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printf("Invalid FAT entry\n");
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return -1;
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}
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dir_curclust = curclust;
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if (get_cluster(mydata, curclust, get_contents_vfatname_block,
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mydata->clust_size * mydata->sect_size) != 0) {
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debug("Error: reading directory block\n");
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return -1;
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}
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slotptr2 = (dir_slot *)get_contents_vfatname_block;
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while (counter > 0) {
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if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
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& 0xff) != counter)
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return -1;
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slotptr2++;
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counter--;
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}
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/* Save the real directory entry */
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realdent = (dir_entry *)slotptr2;
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while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
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slotptr2--;
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slot2str(slotptr2, l_name, &idx);
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}
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} else {
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/* Save the real directory entry */
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realdent = (dir_entry *)slotptr;
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}
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do {
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slotptr--;
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if (slot2str(slotptr, l_name, &idx))
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break;
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} while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
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l_name[idx] = '\0';
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if (*l_name == DELETED_FLAG)
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*l_name = '\0';
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else if (*l_name == aRING)
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*l_name = DELETED_FLAG;
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downcase(l_name);
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/* Return the real directory entry */
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*retdent = realdent;
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if (slotptr2) {
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memcpy(get_dentfromdir_block, get_contents_vfatname_block,
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mydata->clust_size * mydata->sect_size);
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cur_position = (__u8 *)realdent - get_contents_vfatname_block;
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*retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
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}
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return 0;
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}
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/*
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* Set the entry at index 'entry' in a FAT (12/16/32) table.
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*/
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static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value)
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{
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__u32 bufnum, offset, off16;
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__u16 val1, val2;
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switch (mydata->fatsize) {
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case 32:
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bufnum = entry / FAT32BUFSIZE;
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offset = entry - bufnum * FAT32BUFSIZE;
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break;
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case 16:
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bufnum = entry / FAT16BUFSIZE;
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offset = entry - bufnum * FAT16BUFSIZE;
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break;
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case 12:
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bufnum = entry / FAT12BUFSIZE;
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offset = entry - bufnum * FAT12BUFSIZE;
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break;
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default:
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/* Unsupported FAT size */
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return -1;
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}
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/* Read a new block of FAT entries into the cache. */
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if (bufnum != mydata->fatbufnum) {
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int getsize = FATBUFBLOCKS;
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__u8 *bufptr = mydata->fatbuf;
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__u32 fatlength = mydata->fatlength;
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__u32 startblock = bufnum * FATBUFBLOCKS;
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/* Cap length if fatlength is not a multiple of FATBUFBLOCKS */
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if (startblock + getsize > fatlength)
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getsize = fatlength - startblock;
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if (flush_dirty_fat_buffer(mydata) < 0)
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return -1;
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startblock += mydata->fat_sect;
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if (disk_read(startblock, getsize, bufptr) < 0) {
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debug("Error reading FAT blocks\n");
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return -1;
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}
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mydata->fatbufnum = bufnum;
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}
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/* Mark as dirty */
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mydata->fat_dirty = 1;
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/* Set the actual entry */
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switch (mydata->fatsize) {
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case 32:
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((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value);
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break;
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case 16:
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((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value);
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break;
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case 12:
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off16 = (offset * 3) / 4;
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switch (offset & 0x3) {
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case 0:
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val1 = cpu_to_le16(entry_value) & 0xfff;
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((__u16 *)mydata->fatbuf)[off16] &= ~0xfff;
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((__u16 *)mydata->fatbuf)[off16] |= val1;
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break;
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case 1:
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val1 = cpu_to_le16(entry_value) & 0xf;
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val2 = (cpu_to_le16(entry_value) >> 4) & 0xff;
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((__u16 *)mydata->fatbuf)[off16] &= ~0xf000;
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((__u16 *)mydata->fatbuf)[off16] |= (val1 << 12);
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((__u16 *)mydata->fatbuf)[off16 + 1] &= ~0xff;
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((__u16 *)mydata->fatbuf)[off16 + 1] |= val2;
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break;
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case 2:
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val1 = cpu_to_le16(entry_value) & 0xff;
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val2 = (cpu_to_le16(entry_value) >> 8) & 0xf;
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((__u16 *)mydata->fatbuf)[off16] &= ~0xff00;
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((__u16 *)mydata->fatbuf)[off16] |= (val1 << 8);
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((__u16 *)mydata->fatbuf)[off16 + 1] &= ~0xf;
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((__u16 *)mydata->fatbuf)[off16 + 1] |= val2;
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break;
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case 3:
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val1 = cpu_to_le16(entry_value) & 0xfff;
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((__u16 *)mydata->fatbuf)[off16] &= ~0xfff0;
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((__u16 *)mydata->fatbuf)[off16] |= (val1 << 4);
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break;
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default:
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break;
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}
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break;
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default:
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return -1;
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}
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return 0;
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}
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/*
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* Determine the next free cluster after 'entry' in a FAT (12/16/32) table
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* and link it to 'entry'. EOC marker is not set on returned entry.
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*/
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static __u32 determine_fatent(fsdata *mydata, __u32 entry)
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{
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__u32 next_fat, next_entry = entry + 1;
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while (1) {
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next_fat = get_fatent(mydata, next_entry);
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if (next_fat == 0) {
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/* found free entry, link to entry */
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set_fatent_value(mydata, entry, next_entry);
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break;
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}
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next_entry++;
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}
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debug("FAT%d: entry: %08x, entry_value: %04x\n",
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mydata->fatsize, entry, next_entry);
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return next_entry;
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}
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|
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/*
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* Write at most 'size' bytes from 'buffer' into the specified cluster.
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* Return 0 on success, -1 otherwise.
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*/
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static int
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set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
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unsigned long size)
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{
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__u32 idx = 0;
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__u32 startsect;
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int ret;
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|
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if (clustnum > 0)
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startsect = mydata->data_begin +
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clustnum * mydata->clust_size;
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else
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startsect = mydata->rootdir_sect;
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debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
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|
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if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
|
|
ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
|
|
|
|
printf("FAT: Misaligned buffer address (%p)\n", buffer);
|
|
|
|
while (size >= mydata->sect_size) {
|
|
memcpy(tmpbuf, buffer, mydata->sect_size);
|
|
ret = disk_write(startsect++, 1, tmpbuf);
|
|
if (ret != 1) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
buffer += mydata->sect_size;
|
|
size -= mydata->sect_size;
|
|
}
|
|
} else if (size >= mydata->sect_size) {
|
|
idx = size / mydata->sect_size;
|
|
ret = disk_write(startsect, idx, buffer);
|
|
if (ret != idx) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
startsect += idx;
|
|
idx *= mydata->sect_size;
|
|
buffer += idx;
|
|
size -= idx;
|
|
}
|
|
|
|
if (size) {
|
|
ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
|
|
|
|
memcpy(tmpbuf, buffer, size);
|
|
ret = disk_write(startsect, 1, tmpbuf);
|
|
if (ret != 1) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the first empty cluster
|
|
*/
|
|
static int find_empty_cluster(fsdata *mydata)
|
|
{
|
|
__u32 fat_val, entry = 3;
|
|
|
|
while (1) {
|
|
fat_val = get_fatent(mydata, entry);
|
|
if (fat_val == 0)
|
|
break;
|
|
entry++;
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Write directory entries in 'get_dentfromdir_block' to block device
|
|
*/
|
|
static void flush_dir_table(fsdata *mydata, dir_entry **dentptr)
|
|
{
|
|
int dir_newclust = 0;
|
|
|
|
if (set_cluster(mydata, dir_curclust,
|
|
get_dentfromdir_block,
|
|
mydata->clust_size * mydata->sect_size) != 0) {
|
|
printf("error: wrinting directory entry\n");
|
|
return;
|
|
}
|
|
dir_newclust = find_empty_cluster(mydata);
|
|
set_fatent_value(mydata, dir_curclust, dir_newclust);
|
|
if (mydata->fatsize == 32)
|
|
set_fatent_value(mydata, dir_newclust, 0xffffff8);
|
|
else if (mydata->fatsize == 16)
|
|
set_fatent_value(mydata, dir_newclust, 0xfff8);
|
|
else if (mydata->fatsize == 12)
|
|
set_fatent_value(mydata, dir_newclust, 0xff8);
|
|
|
|
dir_curclust = dir_newclust;
|
|
|
|
if (flush_dirty_fat_buffer(mydata) < 0)
|
|
return;
|
|
|
|
memset(get_dentfromdir_block, 0x00,
|
|
mydata->clust_size * mydata->sect_size);
|
|
|
|
*dentptr = (dir_entry *) get_dentfromdir_block;
|
|
}
|
|
|
|
/*
|
|
* Set empty cluster from 'entry' to the end of a file
|
|
*/
|
|
static int clear_fatent(fsdata *mydata, __u32 entry)
|
|
{
|
|
__u32 fat_val;
|
|
|
|
while (!CHECK_CLUST(entry, mydata->fatsize)) {
|
|
fat_val = get_fatent(mydata, entry);
|
|
if (fat_val != 0)
|
|
set_fatent_value(mydata, entry, 0);
|
|
else
|
|
break;
|
|
|
|
entry = fat_val;
|
|
}
|
|
|
|
/* Flush fat buffer */
|
|
if (flush_dirty_fat_buffer(mydata) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write at most 'maxsize' bytes from 'buffer' into
|
|
* the file associated with 'dentptr'
|
|
* Update the number of bytes written in *gotsize and return 0
|
|
* or return -1 on fatal errors.
|
|
*/
|
|
static int
|
|
set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
|
|
loff_t maxsize, loff_t *gotsize)
|
|
{
|
|
loff_t filesize = FAT2CPU32(dentptr->size);
|
|
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
|
|
__u32 curclust = START(dentptr);
|
|
__u32 endclust = 0, newclust = 0;
|
|
loff_t actsize;
|
|
|
|
*gotsize = 0;
|
|
debug("Filesize: %llu bytes\n", filesize);
|
|
|
|
if (maxsize > 0 && filesize > maxsize)
|
|
filesize = maxsize;
|
|
|
|
debug("%llu bytes\n", filesize);
|
|
|
|
if (!curclust) {
|
|
if (filesize) {
|
|
debug("error: nonempty clusterless file!\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
actsize = bytesperclust;
|
|
endclust = curclust;
|
|
do {
|
|
/* search for consecutive clusters */
|
|
while (actsize < filesize) {
|
|
newclust = determine_fatent(mydata, endclust);
|
|
|
|
if ((newclust - 1) != endclust)
|
|
goto getit;
|
|
|
|
if (CHECK_CLUST(newclust, mydata->fatsize)) {
|
|
debug("newclust: 0x%x\n", newclust);
|
|
debug("Invalid FAT entry\n");
|
|
return 0;
|
|
}
|
|
endclust = newclust;
|
|
actsize += bytesperclust;
|
|
}
|
|
|
|
/* set remaining bytes */
|
|
actsize = filesize;
|
|
if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
|
|
debug("error: writing cluster\n");
|
|
return -1;
|
|
}
|
|
*gotsize += actsize;
|
|
|
|
/* Mark end of file in FAT */
|
|
if (mydata->fatsize == 12)
|
|
newclust = 0xfff;
|
|
else if (mydata->fatsize == 16)
|
|
newclust = 0xffff;
|
|
else if (mydata->fatsize == 32)
|
|
newclust = 0xfffffff;
|
|
set_fatent_value(mydata, endclust, newclust);
|
|
|
|
return 0;
|
|
getit:
|
|
if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
|
|
debug("error: writing cluster\n");
|
|
return -1;
|
|
}
|
|
*gotsize += actsize;
|
|
filesize -= actsize;
|
|
buffer += actsize;
|
|
|
|
if (CHECK_CLUST(newclust, mydata->fatsize)) {
|
|
debug("newclust: 0x%x\n", newclust);
|
|
debug("Invalid FAT entry\n");
|
|
return 0;
|
|
}
|
|
actsize = bytesperclust;
|
|
curclust = endclust = newclust;
|
|
} while (1);
|
|
}
|
|
|
|
/*
|
|
* Set start cluster in directory entry
|
|
*/
|
|
static void set_start_cluster(const fsdata *mydata, dir_entry *dentptr,
|
|
__u32 start_cluster)
|
|
{
|
|
if (mydata->fatsize == 32)
|
|
dentptr->starthi =
|
|
cpu_to_le16((start_cluster & 0xffff0000) >> 16);
|
|
dentptr->start = cpu_to_le16(start_cluster & 0xffff);
|
|
}
|
|
|
|
/*
|
|
* Fill dir_entry
|
|
*/
|
|
static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
|
|
const char *filename, __u32 start_cluster, __u32 size, __u8 attr)
|
|
{
|
|
set_start_cluster(mydata, dentptr, start_cluster);
|
|
dentptr->size = cpu_to_le32(size);
|
|
|
|
dentptr->attr = attr;
|
|
|
|
set_name(dentptr, filename);
|
|
}
|
|
|
|
/*
|
|
* Check whether adding a file makes the file system to
|
|
* exceed the size of the block device
|
|
* Return -1 when overflow occurs, otherwise return 0
|
|
*/
|
|
static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
|
|
{
|
|
__u32 startsect, sect_num, offset;
|
|
|
|
if (clustnum > 0) {
|
|
startsect = mydata->data_begin +
|
|
clustnum * mydata->clust_size;
|
|
} else {
|
|
startsect = mydata->rootdir_sect;
|
|
}
|
|
|
|
sect_num = div_u64_rem(size, mydata->sect_size, &offset);
|
|
|
|
if (offset != 0)
|
|
sect_num++;
|
|
|
|
if (startsect + sect_num > cur_part_info.start + total_sector)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if adding several entries exceed one cluster boundary
|
|
*/
|
|
static int is_next_clust(fsdata *mydata, dir_entry *dentptr)
|
|
{
|
|
int cur_position;
|
|
|
|
cur_position = (__u8 *)dentptr - get_dentfromdir_block;
|
|
|
|
if (cur_position >= mydata->clust_size * mydata->sect_size)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static dir_entry *empty_dentptr;
|
|
/*
|
|
* Find a directory entry based on filename or start cluster number
|
|
* If the directory entry is not found,
|
|
* the new position for writing a directory entry will be returned
|
|
*/
|
|
static dir_entry *find_directory_entry(fsdata *mydata, int startsect,
|
|
char *filename, dir_entry *retdent, __u32 start)
|
|
{
|
|
__u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
|
|
|
|
debug("get_dentfromdir: %s\n", filename);
|
|
|
|
while (1) {
|
|
dir_entry *dentptr;
|
|
|
|
int i;
|
|
|
|
if (get_cluster(mydata, curclust, get_dentfromdir_block,
|
|
mydata->clust_size * mydata->sect_size) != 0) {
|
|
printf("Error: reading directory block\n");
|
|
return NULL;
|
|
}
|
|
|
|
dentptr = (dir_entry *)get_dentfromdir_block;
|
|
|
|
dir_curclust = curclust;
|
|
|
|
for (i = 0; i < DIRENTSPERCLUST; i++) {
|
|
char s_name[14], l_name[VFAT_MAXLEN_BYTES];
|
|
|
|
l_name[0] = '\0';
|
|
if (dentptr->name[0] == DELETED_FLAG) {
|
|
dentptr++;
|
|
if (is_next_clust(mydata, dentptr))
|
|
break;
|
|
continue;
|
|
}
|
|
if ((dentptr->attr & ATTR_VOLUME)) {
|
|
if (vfat_enabled &&
|
|
(dentptr->attr & ATTR_VFAT) &&
|
|
(dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
|
|
get_long_file_name(mydata, curclust,
|
|
get_dentfromdir_block,
|
|
&dentptr, l_name);
|
|
debug("vfatname: |%s|\n", l_name);
|
|
} else {
|
|
/* Volume label or VFAT entry */
|
|
dentptr++;
|
|
if (is_next_clust(mydata, dentptr))
|
|
break;
|
|
continue;
|
|
}
|
|
}
|
|
if (dentptr->name[0] == 0) {
|
|
debug("Dentname == NULL - %d\n", i);
|
|
empty_dentptr = dentptr;
|
|
return NULL;
|
|
}
|
|
|
|
get_name(dentptr, s_name);
|
|
|
|
if (strcmp(filename, s_name)
|
|
&& strcmp(filename, l_name)) {
|
|
debug("Mismatch: |%s|%s|\n",
|
|
s_name, l_name);
|
|
dentptr++;
|
|
if (is_next_clust(mydata, dentptr))
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
memcpy(retdent, dentptr, sizeof(dir_entry));
|
|
|
|
debug("DentName: %s", s_name);
|
|
debug(", start: 0x%x", START(dentptr));
|
|
debug(", size: 0x%x %s\n",
|
|
FAT2CPU32(dentptr->size),
|
|
(dentptr->attr & ATTR_DIR) ?
|
|
"(DIR)" : "");
|
|
|
|
return dentptr;
|
|
}
|
|
|
|
/*
|
|
* In FAT16/12, the root dir is locate before data area, shows
|
|
* in following:
|
|
* -------------------------------------------------------------
|
|
* | Boot | FAT1 & 2 | Root dir | Data (start from cluster #2) |
|
|
* -------------------------------------------------------------
|
|
*
|
|
* As a result if curclust is in Root dir, it is a negative
|
|
* number or 0, 1.
|
|
*
|
|
*/
|
|
if (mydata->fatsize != 32 && (int)curclust <= 1) {
|
|
/* Current clust is in root dir, set to next clust */
|
|
curclust++;
|
|
if ((int)curclust <= 1)
|
|
continue; /* continue to find */
|
|
|
|
/* Reach the end of root dir */
|
|
empty_dentptr = dentptr;
|
|
return NULL;
|
|
}
|
|
|
|
curclust = get_fatent(mydata, dir_curclust);
|
|
if (IS_LAST_CLUST(curclust, mydata->fatsize)) {
|
|
empty_dentptr = dentptr;
|
|
return NULL;
|
|
}
|
|
if (CHECK_CLUST(curclust, mydata->fatsize)) {
|
|
debug("curclust: 0x%x\n", curclust);
|
|
debug("Invalid FAT entry\n");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int do_fat_write(const char *filename, void *buffer, loff_t size,
|
|
loff_t *actwrite)
|
|
{
|
|
dir_entry *dentptr, *retdent;
|
|
__u32 startsect;
|
|
__u32 start_cluster;
|
|
boot_sector bs;
|
|
volume_info volinfo;
|
|
fsdata datablock;
|
|
fsdata *mydata = &datablock;
|
|
int cursect;
|
|
int ret = -1, name_len;
|
|
char l_filename[VFAT_MAXLEN_BYTES];
|
|
|
|
*actwrite = size;
|
|
dir_curclust = 0;
|
|
|
|
if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
|
|
debug("error: reading boot sector\n");
|
|
return -1;
|
|
}
|
|
|
|
total_sector = bs.total_sect;
|
|
if (total_sector == 0)
|
|
total_sector = (int)cur_part_info.size; /* cast of lbaint_t */
|
|
|
|
if (mydata->fatsize == 32)
|
|
mydata->fatlength = bs.fat32_length;
|
|
else
|
|
mydata->fatlength = bs.fat_length;
|
|
|
|
mydata->fat_sect = bs.reserved;
|
|
|
|
cursect = mydata->rootdir_sect
|
|
= mydata->fat_sect + mydata->fatlength * bs.fats;
|
|
num_of_fats = bs.fats;
|
|
|
|
mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
|
|
mydata->clust_size = bs.cluster_size;
|
|
|
|
if (mydata->fatsize == 32) {
|
|
mydata->data_begin = mydata->rootdir_sect -
|
|
(mydata->clust_size * 2);
|
|
} else {
|
|
int rootdir_size;
|
|
|
|
rootdir_size = ((bs.dir_entries[1] * (int)256 +
|
|
bs.dir_entries[0]) *
|
|
sizeof(dir_entry)) /
|
|
mydata->sect_size;
|
|
mydata->data_begin = mydata->rootdir_sect +
|
|
rootdir_size -
|
|
(mydata->clust_size * 2);
|
|
}
|
|
|
|
mydata->fatbufnum = -1;
|
|
mydata->fat_dirty = 0;
|
|
mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
|
|
if (mydata->fatbuf == NULL) {
|
|
debug("Error: allocating memory\n");
|
|
return -1;
|
|
}
|
|
|
|
if (disk_read(cursect,
|
|
(mydata->fatsize == 32) ?
|
|
(mydata->clust_size) :
|
|
PREFETCH_BLOCKS, do_fat_read_at_block) < 0) {
|
|
debug("Error: reading rootdir block\n");
|
|
goto exit;
|
|
}
|
|
dentptr = (dir_entry *) do_fat_read_at_block;
|
|
|
|
name_len = strlen(filename);
|
|
if (name_len >= VFAT_MAXLEN_BYTES)
|
|
name_len = VFAT_MAXLEN_BYTES - 1;
|
|
|
|
memcpy(l_filename, filename, name_len);
|
|
l_filename[name_len] = 0; /* terminate the string */
|
|
downcase(l_filename);
|
|
|
|
startsect = mydata->rootdir_sect;
|
|
retdent = find_directory_entry(mydata, startsect,
|
|
l_filename, dentptr, 0);
|
|
if (retdent) {
|
|
/* Update file size and start_cluster in a directory entry */
|
|
retdent->size = cpu_to_le32(size);
|
|
start_cluster = START(retdent);
|
|
|
|
if (start_cluster) {
|
|
if (size) {
|
|
ret = check_overflow(mydata, start_cluster,
|
|
size);
|
|
if (ret) {
|
|
printf("Error: %llu overflow\n", size);
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
ret = clear_fatent(mydata, start_cluster);
|
|
if (ret) {
|
|
printf("Error: clearing FAT entries\n");
|
|
goto exit;
|
|
}
|
|
|
|
if (!size)
|
|
set_start_cluster(mydata, retdent, 0);
|
|
} else if (size) {
|
|
ret = start_cluster = find_empty_cluster(mydata);
|
|
if (ret < 0) {
|
|
printf("Error: finding empty cluster\n");
|
|
goto exit;
|
|
}
|
|
|
|
ret = check_overflow(mydata, start_cluster, size);
|
|
if (ret) {
|
|
printf("Error: %llu overflow\n", size);
|
|
goto exit;
|
|
}
|
|
|
|
set_start_cluster(mydata, retdent, start_cluster);
|
|
}
|
|
} else {
|
|
/* Set short name to set alias checksum field in dir_slot */
|
|
set_name(empty_dentptr, filename);
|
|
fill_dir_slot(mydata, &empty_dentptr, filename);
|
|
|
|
if (size) {
|
|
ret = start_cluster = find_empty_cluster(mydata);
|
|
if (ret < 0) {
|
|
printf("Error: finding empty cluster\n");
|
|
goto exit;
|
|
}
|
|
|
|
ret = check_overflow(mydata, start_cluster, size);
|
|
if (ret) {
|
|
printf("Error: %llu overflow\n", size);
|
|
goto exit;
|
|
}
|
|
} else {
|
|
start_cluster = 0;
|
|
}
|
|
|
|
/* Set attribute as archieve for regular file */
|
|
fill_dentry(mydata, empty_dentptr, filename,
|
|
start_cluster, size, 0x20);
|
|
|
|
retdent = empty_dentptr;
|
|
}
|
|
|
|
ret = set_contents(mydata, retdent, buffer, size, actwrite);
|
|
if (ret < 0) {
|
|
printf("Error: writing contents\n");
|
|
goto exit;
|
|
}
|
|
debug("attempt to write 0x%llx bytes\n", *actwrite);
|
|
|
|
/* Flush fat buffer */
|
|
ret = flush_dirty_fat_buffer(mydata);
|
|
if (ret) {
|
|
printf("Error: flush fat buffer\n");
|
|
goto exit;
|
|
}
|
|
|
|
/* Write directory table to device */
|
|
ret = set_cluster(mydata, dir_curclust, get_dentfromdir_block,
|
|
mydata->clust_size * mydata->sect_size);
|
|
if (ret)
|
|
printf("Error: writing directory entry\n");
|
|
|
|
exit:
|
|
free(mydata->fatbuf);
|
|
return ret;
|
|
}
|
|
|
|
int file_fat_write(const char *filename, void *buffer, loff_t offset,
|
|
loff_t maxsize, loff_t *actwrite)
|
|
{
|
|
if (offset != 0) {
|
|
printf("Error: non zero offset is currently not supported.\n");
|
|
return -1;
|
|
}
|
|
|
|
printf("writing %s\n", filename);
|
|
return do_fat_write(filename, buffer, maxsize, actwrite);
|
|
}
|