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![Heinrich Schuchardt](/assets/img/avatar_default.png)
Long file names are stored in multiple directory entries. When deleting a file we must delete all of them. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
1757 lines
38 KiB
C
1757 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include <command.h>
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#include <config.h>
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#include <div64.h>
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#include <fat.h>
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#include <log.h>
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#include <malloc.h>
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#include <part.h>
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#include <rand.h>
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#include <asm/byteorder.h>
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#include <asm/cache.h>
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#include <linux/ctype.h>
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#include <linux/math64.h>
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#include "fat.c"
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static dir_entry *find_directory_entry(fat_itr *itr, char *filename);
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static int new_dir_table(fat_itr *itr);
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/* Characters that may only be used in long file names */
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static const char LONG_ONLY_CHARS[] = "+,;=[]";
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/* Combined size of the name and ext fields in the directory entry */
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#define SHORT_NAME_SIZE 11
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/**
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* str2fat() - convert string to valid FAT name characters
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*
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* Stop when reaching end of @src or a period.
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* Ignore spaces.
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* Replace characters that may only be used in long names by underscores.
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* Convert lower case characters to upper case.
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*
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* To avoid assumptions about the code page we do not use characters
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* above 0x7f for the short name.
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*
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* @dest: destination buffer
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* @src: source buffer
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* @length: size of destination buffer
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* Return: number of bytes in destination buffer
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*/
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static int str2fat(char *dest, char *src, int length)
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{
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int i;
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for (i = 0; i < length; ++src) {
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char c = *src;
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if (!c || c == '.')
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break;
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if (c == ' ')
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continue;
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if (strchr(LONG_ONLY_CHARS, c) || c > 0x7f)
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c = '_';
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else if (c >= 'a' && c <= 'z')
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c &= 0xdf;
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dest[i] = c;
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++i;
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}
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return i;
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}
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/**
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* fat_move_to_cluster() - position to first directory entry in cluster
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*
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* @itr: directory iterator
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* @cluster cluster
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* Return: 0 for success, -EIO on error
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*/
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static int fat_move_to_cluster(fat_itr *itr, unsigned int cluster)
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{
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unsigned int nbytes;
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/* position to the start of the directory */
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itr->next_clust = cluster;
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itr->last_cluster = 0;
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if (!fat_next_cluster(itr, &nbytes))
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return -EIO;
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itr->dent = (dir_entry *)itr->block;
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itr->remaining = nbytes / sizeof(dir_entry) - 1;
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return 0;
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}
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/**
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* set_name() - set short name in directory entry
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*
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* The function determines if the @filename is a valid short name.
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* In this case no long name is needed.
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*
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* If a long name is needed, a short name is constructed.
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*
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* @itr: directory iterator
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* @filename: long file name
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* @shortname: buffer of 11 bytes to receive chosen short name and extension
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* Return: number of directory entries needed, negative on error
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*/
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static int set_name(fat_itr *itr, const char *filename, char *shortname)
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{
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char *period;
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char *pos;
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int period_location;
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char buf[13];
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int i;
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int ret;
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struct {
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char name[8];
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char ext[3];
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} dirent;
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if (!filename)
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return -EIO;
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/* Initialize buffer */
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memset(&dirent, ' ', sizeof(dirent));
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/* Convert filename to upper case short name */
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period = strrchr(filename, '.');
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pos = (char *)filename;
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if (*pos == '.') {
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pos = period + 1;
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period = 0;
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}
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if (period)
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str2fat(dirent.ext, period + 1, sizeof(dirent.ext));
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period_location = str2fat(dirent.name, pos, sizeof(dirent.name));
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if (period_location < 0)
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return period_location;
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if (*dirent.name == ' ')
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*dirent.name = '_';
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/* 0xe5 signals a deleted directory entry. Replace it by 0x05. */
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if (*dirent.name == 0xe5)
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*dirent.name = 0x05;
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/* If filename and short name are the same, quit. */
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sprintf(buf, "%.*s.%.3s", period_location, dirent.name, dirent.ext);
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if (!strcmp(buf, filename)) {
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ret = 1;
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goto out;
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}
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/* Construct an indexed short name */
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for (i = 1; i < 0x200000; ++i) {
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int suffix_len;
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int suffix_start;
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int j;
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/* To speed up the search use random numbers */
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if (i < 10) {
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j = i;
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} else {
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j = 30 - fls(i);
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j = 10 + (rand() >> j);
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}
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sprintf(buf, "~%d", j);
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suffix_len = strlen(buf);
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suffix_start = 8 - suffix_len;
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if (suffix_start > period_location)
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suffix_start = period_location;
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memcpy(dirent.name + suffix_start, buf, suffix_len);
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if (*dirent.ext != ' ')
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sprintf(buf, "%.*s.%.3s", suffix_start + suffix_len,
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dirent.name, dirent.ext);
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else
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sprintf(buf, "%.*s", suffix_start + suffix_len,
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dirent.name);
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debug("generated short name: %s\n", buf);
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/* Check that the short name does not exist yet. */
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ret = fat_move_to_cluster(itr, itr->start_clust);
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if (ret)
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return ret;
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if (find_directory_entry(itr, buf))
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continue;
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debug("chosen short name: %s\n", buf);
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/* Each long name directory entry takes 13 characters. */
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ret = (strlen(filename) + 25) / 13;
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goto out;
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}
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return -EIO;
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out:
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memcpy(shortname, dirent.name, SHORT_NAME_SIZE);
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return ret;
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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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* 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 (mydata->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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* fat_find_empty_dentries() - find a sequence of available directory entries
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*
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* @itr: directory iterator
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* @count: number of directory entries to find
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* Return: 0 on success or negative error number
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*/
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static int fat_find_empty_dentries(fat_itr *itr, int count)
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{
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unsigned int cluster;
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dir_entry *dent;
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int remaining;
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unsigned int n = 0;
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int ret;
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ret = fat_move_to_cluster(itr, itr->start_clust);
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if (ret)
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return ret;
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for (;;) {
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if (!itr->dent) {
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log_debug("Not enough directory entries available\n");
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return -ENOSPC;
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}
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switch (itr->dent->name[0]) {
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case 0x00:
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case DELETED_FLAG:
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if (!n) {
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/* Remember first deleted directory entry */
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cluster = itr->clust;
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dent = itr->dent;
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remaining = itr->remaining;
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}
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++n;
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if (n == count)
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goto out;
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break;
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default:
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n = 0;
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break;
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}
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next_dent(itr);
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if (!itr->dent &&
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(!itr->is_root || itr->fsdata->fatsize == 32) &&
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new_dir_table(itr))
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return -ENOSPC;
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}
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out:
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/* Position back to first directory entry */
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if (itr->clust != cluster) {
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ret = fat_move_to_cluster(itr, cluster);
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if (ret)
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return ret;
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}
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itr->dent = dent;
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itr->remaining = remaining;
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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 flush_dir(fat_itr *itr);
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/**
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* fill_dir_slot() - fill directory entries for long name
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*
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* @itr: directory iterator
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* @l_name: long name
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* @shortname: short name
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* Return: 0 for success, -errno otherwise
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*/
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static int
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fill_dir_slot(fat_itr *itr, const char *l_name, const char *shortname)
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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(shortname, shortname + 8);
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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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memcpy(itr->dent, slotptr, sizeof(dir_slot));
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slotptr--;
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counter--;
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if (itr->remaining == 0)
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flush_dir(itr);
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next_dent(itr);
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if (!itr->dent)
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return -EIO;
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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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|
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startblock += mydata->fat_sect;
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|
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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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|
|
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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;
|
|
default:
|
|
break;
|
|
}
|
|
|
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break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Determine the next free cluster after 'entry' in a FAT (12/16/32) table
|
|
* and link it to 'entry'. EOC marker is not set on returned entry.
|
|
*/
|
|
static __u32 determine_fatent(fsdata *mydata, __u32 entry)
|
|
{
|
|
__u32 next_fat, next_entry = entry + 1;
|
|
|
|
while (1) {
|
|
next_fat = get_fatent(mydata, next_entry);
|
|
if (next_fat == 0) {
|
|
/* found free entry, link to entry */
|
|
set_fatent_value(mydata, entry, next_entry);
|
|
break;
|
|
}
|
|
next_entry++;
|
|
}
|
|
debug("FAT%d: entry: %08x, entry_value: %04x\n",
|
|
mydata->fatsize, entry, next_entry);
|
|
|
|
return next_entry;
|
|
}
|
|
|
|
/**
|
|
* set_sectors() - write data to sectors
|
|
*
|
|
* Write 'size' bytes from 'buffer' into the specified sector.
|
|
*
|
|
* @mydata: data to be written
|
|
* @startsect: sector to be written to
|
|
* @buffer: data to be written
|
|
* @size: bytes to be written (but not more than the size of a cluster)
|
|
* Return: 0 on success, -1 otherwise
|
|
*/
|
|
static int
|
|
set_sectors(fsdata *mydata, u32 startsect, u8 *buffer, u32 size)
|
|
{
|
|
u32 nsects = 0;
|
|
int ret;
|
|
|
|
debug("startsect: %d\n", startsect);
|
|
|
|
if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
|
|
ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
|
|
|
|
debug("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) {
|
|
nsects = size / mydata->sect_size;
|
|
ret = disk_write(startsect, nsects, buffer);
|
|
if (ret != nsects) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
startsect += nsects;
|
|
buffer += nsects * mydata->sect_size;
|
|
size -= nsects * mydata->sect_size;
|
|
}
|
|
|
|
if (size) {
|
|
ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
|
|
/* Do not leak content of stack */
|
|
memset(tmpbuf, 0, 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;
|
|
}
|
|
|
|
/**
|
|
* set_cluster() - write data to cluster
|
|
*
|
|
* Write 'size' bytes from 'buffer' into the specified cluster.
|
|
*
|
|
* @mydata: data to be written
|
|
* @clustnum: cluster to be written to
|
|
* @buffer: data to be written
|
|
* @size: bytes to be written (but not more than the size of a cluster)
|
|
* Return: 0 on success, -1 otherwise
|
|
*/
|
|
static int
|
|
set_cluster(fsdata *mydata, u32 clustnum, u8 *buffer, u32 size)
|
|
{
|
|
return set_sectors(mydata, clust_to_sect(mydata, clustnum),
|
|
buffer, size);
|
|
}
|
|
|
|
static int
|
|
flush_dir(fat_itr *itr)
|
|
{
|
|
fsdata *mydata = itr->fsdata;
|
|
u32 startsect, sect_offset, nsects;
|
|
|
|
if (!itr->is_root || mydata->fatsize == 32)
|
|
return set_cluster(mydata, itr->clust, itr->block,
|
|
mydata->clust_size * mydata->sect_size);
|
|
|
|
sect_offset = itr->clust * mydata->clust_size;
|
|
startsect = mydata->rootdir_sect + sect_offset;
|
|
/* do not write past the end of rootdir */
|
|
nsects = min_t(u32, mydata->clust_size,
|
|
mydata->rootdir_size - sect_offset);
|
|
|
|
return set_sectors(mydata, startsect, itr->block,
|
|
nsects * mydata->sect_size);
|
|
}
|
|
|
|
/*
|
|
* Read and modify data on existing and consecutive cluster blocks
|
|
*/
|
|
static int
|
|
get_set_cluster(fsdata *mydata, __u32 clustnum, loff_t pos, __u8 *buffer,
|
|
loff_t size, loff_t *gotsize)
|
|
{
|
|
static u8 *tmpbuf_cluster;
|
|
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
|
|
__u32 startsect;
|
|
loff_t wsize;
|
|
int clustcount, i, ret;
|
|
|
|
*gotsize = 0;
|
|
if (!size)
|
|
return 0;
|
|
|
|
if (!tmpbuf_cluster) {
|
|
tmpbuf_cluster = memalign(ARCH_DMA_MINALIGN, MAX_CLUSTSIZE);
|
|
if (!tmpbuf_cluster)
|
|
return -1;
|
|
}
|
|
|
|
assert(pos < bytesperclust);
|
|
startsect = clust_to_sect(mydata, clustnum);
|
|
|
|
debug("clustnum: %d, startsect: %d, pos: %lld\n",
|
|
clustnum, startsect, pos);
|
|
|
|
/* partial write at beginning */
|
|
if (pos) {
|
|
wsize = min(bytesperclust - pos, size);
|
|
ret = disk_read(startsect, mydata->clust_size, tmpbuf_cluster);
|
|
if (ret != mydata->clust_size) {
|
|
debug("Error reading data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
memcpy(tmpbuf_cluster + pos, buffer, wsize);
|
|
ret = disk_write(startsect, mydata->clust_size, tmpbuf_cluster);
|
|
if (ret != mydata->clust_size) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
size -= wsize;
|
|
buffer += wsize;
|
|
*gotsize += wsize;
|
|
|
|
startsect += mydata->clust_size;
|
|
|
|
if (!size)
|
|
return 0;
|
|
}
|
|
|
|
/* full-cluster write */
|
|
if (size >= bytesperclust) {
|
|
clustcount = lldiv(size, bytesperclust);
|
|
|
|
if (!((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1))) {
|
|
wsize = clustcount * bytesperclust;
|
|
ret = disk_write(startsect,
|
|
clustcount * mydata->clust_size,
|
|
buffer);
|
|
if (ret != clustcount * mydata->clust_size) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
size -= wsize;
|
|
buffer += wsize;
|
|
*gotsize += wsize;
|
|
|
|
startsect += clustcount * mydata->clust_size;
|
|
} else {
|
|
for (i = 0; i < clustcount; i++) {
|
|
memcpy(tmpbuf_cluster, buffer, bytesperclust);
|
|
ret = disk_write(startsect,
|
|
mydata->clust_size,
|
|
tmpbuf_cluster);
|
|
if (ret != mydata->clust_size) {
|
|
debug("Error writing data (got %d)\n",
|
|
ret);
|
|
return -1;
|
|
}
|
|
|
|
size -= bytesperclust;
|
|
buffer += bytesperclust;
|
|
*gotsize += bytesperclust;
|
|
|
|
startsect += mydata->clust_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* partial write at end */
|
|
if (size) {
|
|
wsize = size;
|
|
ret = disk_read(startsect, mydata->clust_size, tmpbuf_cluster);
|
|
if (ret != mydata->clust_size) {
|
|
debug("Error reading data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
memcpy(tmpbuf_cluster, buffer, wsize);
|
|
ret = disk_write(startsect, mydata->clust_size, tmpbuf_cluster);
|
|
if (ret != mydata->clust_size) {
|
|
debug("Error writing data (got %d)\n", ret);
|
|
return -1;
|
|
}
|
|
|
|
size -= wsize;
|
|
buffer += wsize;
|
|
*gotsize += wsize;
|
|
}
|
|
|
|
assert(!size);
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* new_dir_table() - allocate a cluster for additional directory entries
|
|
*
|
|
* @itr: directory iterator
|
|
* Return: 0 on success, -EIO otherwise
|
|
*/
|
|
static int new_dir_table(fat_itr *itr)
|
|
{
|
|
fsdata *mydata = itr->fsdata;
|
|
int dir_newclust = 0;
|
|
int dir_oldclust = itr->clust;
|
|
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
|
|
|
|
dir_newclust = find_empty_cluster(mydata);
|
|
|
|
/*
|
|
* Flush before updating FAT to ensure valid directory structure
|
|
* in case of failure.
|
|
*/
|
|
itr->clust = dir_newclust;
|
|
itr->next_clust = dir_newclust;
|
|
memset(itr->block, 0x00, bytesperclust);
|
|
if (flush_dir(itr))
|
|
return -EIO;
|
|
|
|
set_fatent_value(mydata, dir_oldclust, 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);
|
|
|
|
if (flush_dirty_fat_buffer(mydata) < 0)
|
|
return -EIO;
|
|
|
|
itr->dent = (dir_entry *)itr->block;
|
|
itr->last_cluster = 1;
|
|
itr->remaining = bytesperclust / sizeof(dir_entry) - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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 = clust_to_sect(mydata, clustnum);
|
|
else
|
|
startsect = mydata->rootdir_sect;
|
|
|
|
sect_num = div_u64_rem(size, mydata->sect_size, &offset);
|
|
|
|
if (offset != 0)
|
|
sect_num++;
|
|
|
|
if (startsect + sect_num > total_sector)
|
|
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, loff_t pos, __u8 *buffer,
|
|
loff_t maxsize, loff_t *gotsize)
|
|
{
|
|
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
|
|
__u32 curclust = START(dentptr);
|
|
__u32 endclust = 0, newclust = 0;
|
|
u64 cur_pos, filesize;
|
|
loff_t offset, actsize, wsize;
|
|
|
|
*gotsize = 0;
|
|
filesize = pos + maxsize;
|
|
|
|
debug("%llu bytes\n", filesize);
|
|
|
|
if (!filesize) {
|
|
if (!curclust)
|
|
return 0;
|
|
if (!CHECK_CLUST(curclust, mydata->fatsize) ||
|
|
IS_LAST_CLUST(curclust, mydata->fatsize)) {
|
|
clear_fatent(mydata, curclust);
|
|
set_start_cluster(mydata, dentptr, 0);
|
|
return 0;
|
|
}
|
|
debug("curclust: 0x%x\n", curclust);
|
|
debug("Invalid FAT entry\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!curclust) {
|
|
assert(pos == 0);
|
|
goto set_clusters;
|
|
}
|
|
|
|
/* go to cluster at pos */
|
|
cur_pos = bytesperclust;
|
|
while (1) {
|
|
if (pos <= cur_pos)
|
|
break;
|
|
if (IS_LAST_CLUST(curclust, mydata->fatsize))
|
|
break;
|
|
|
|
newclust = get_fatent(mydata, curclust);
|
|
if (!IS_LAST_CLUST(newclust, mydata->fatsize) &&
|
|
CHECK_CLUST(newclust, mydata->fatsize)) {
|
|
debug("curclust: 0x%x\n", curclust);
|
|
debug("Invalid FAT entry\n");
|
|
return -1;
|
|
}
|
|
|
|
cur_pos += bytesperclust;
|
|
curclust = newclust;
|
|
}
|
|
if (IS_LAST_CLUST(curclust, mydata->fatsize)) {
|
|
assert(pos == cur_pos);
|
|
goto set_clusters;
|
|
}
|
|
|
|
assert(pos < cur_pos);
|
|
cur_pos -= bytesperclust;
|
|
|
|
/* overwrite */
|
|
assert(IS_LAST_CLUST(curclust, mydata->fatsize) ||
|
|
!CHECK_CLUST(curclust, mydata->fatsize));
|
|
|
|
while (1) {
|
|
/* search for allocated consecutive clusters */
|
|
actsize = bytesperclust;
|
|
endclust = curclust;
|
|
while (1) {
|
|
if (filesize <= (cur_pos + actsize))
|
|
break;
|
|
|
|
newclust = get_fatent(mydata, endclust);
|
|
|
|
if (newclust != endclust + 1)
|
|
break;
|
|
if (IS_LAST_CLUST(newclust, mydata->fatsize))
|
|
break;
|
|
if (CHECK_CLUST(newclust, mydata->fatsize)) {
|
|
debug("curclust: 0x%x\n", curclust);
|
|
debug("Invalid FAT entry\n");
|
|
return -1;
|
|
}
|
|
|
|
actsize += bytesperclust;
|
|
endclust = newclust;
|
|
}
|
|
|
|
/* overwrite to <curclust..endclust> */
|
|
if (pos < cur_pos)
|
|
offset = 0;
|
|
else
|
|
offset = pos - cur_pos;
|
|
wsize = min_t(unsigned long long, actsize, filesize - cur_pos);
|
|
wsize -= offset;
|
|
|
|
if (get_set_cluster(mydata, curclust, offset,
|
|
buffer, wsize, &actsize)) {
|
|
printf("Error get-and-setting cluster\n");
|
|
return -1;
|
|
}
|
|
buffer += wsize;
|
|
*gotsize += wsize;
|
|
cur_pos += offset + wsize;
|
|
|
|
if (filesize <= cur_pos)
|
|
break;
|
|
|
|
if (IS_LAST_CLUST(newclust, mydata->fatsize))
|
|
/* no more clusters */
|
|
break;
|
|
|
|
curclust = newclust;
|
|
}
|
|
|
|
if (filesize <= cur_pos) {
|
|
/* no more write */
|
|
newclust = get_fatent(mydata, endclust);
|
|
if (!IS_LAST_CLUST(newclust, mydata->fatsize)) {
|
|
/* truncate the rest */
|
|
clear_fatent(mydata, newclust);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
curclust = endclust;
|
|
filesize -= cur_pos;
|
|
assert(!do_div(cur_pos, bytesperclust));
|
|
|
|
set_clusters:
|
|
/* allocate and write */
|
|
assert(!pos);
|
|
|
|
/* Assure that curclust is valid */
|
|
if (!curclust) {
|
|
curclust = find_empty_cluster(mydata);
|
|
set_start_cluster(mydata, dentptr, curclust);
|
|
} else {
|
|
newclust = get_fatent(mydata, curclust);
|
|
|
|
if (IS_LAST_CLUST(newclust, mydata->fatsize)) {
|
|
newclust = determine_fatent(mydata, curclust);
|
|
set_fatent_value(mydata, curclust, newclust);
|
|
curclust = newclust;
|
|
} else {
|
|
debug("error: something wrong\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* TODO: already partially written */
|
|
if (check_overflow(mydata, curclust, filesize)) {
|
|
printf("Error: no space left: %llu\n", filesize);
|
|
return -1;
|
|
}
|
|
|
|
actsize = bytesperclust;
|
|
endclust = curclust;
|
|
do {
|
|
/* search for consecutive clusters */
|
|
while (actsize < filesize) {
|
|
newclust = determine_fatent(mydata, endclust);
|
|
|
|
if ((newclust - 1) != endclust)
|
|
/* write to <curclust..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, (u32)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, (u32)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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fill_dentry() - fill directory entry with shortname
|
|
*
|
|
* @mydata: private filesystem parameters
|
|
* @dentptr: directory entry
|
|
* @shortname: chosen short name
|
|
* @start_cluster: first cluster of file
|
|
* @size: file size
|
|
* @attr: file attributes
|
|
*/
|
|
static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
|
|
const char *shortname, __u32 start_cluster, __u32 size, __u8 attr)
|
|
{
|
|
memset(dentptr, 0, sizeof(*dentptr));
|
|
|
|
set_start_cluster(mydata, dentptr, start_cluster);
|
|
dentptr->size = cpu_to_le32(size);
|
|
|
|
dentptr->attr = attr;
|
|
|
|
memcpy(dentptr->name, shortname, SHORT_NAME_SIZE);
|
|
}
|
|
|
|
/**
|
|
* find_directory_entry() - find a directory entry by filename
|
|
*
|
|
* @itr: directory iterator
|
|
* @filename: name of file to find
|
|
* Return: directory entry or NULL
|
|
*/
|
|
static dir_entry *find_directory_entry(fat_itr *itr, char *filename)
|
|
{
|
|
int match = 0;
|
|
|
|
while (fat_itr_next(itr)) {
|
|
/* check both long and short name: */
|
|
if (!strcasecmp(filename, itr->name))
|
|
match = 1;
|
|
else if (itr->name != itr->s_name &&
|
|
!strcasecmp(filename, itr->s_name))
|
|
match = 1;
|
|
|
|
if (!match)
|
|
continue;
|
|
|
|
if (itr->dent->name[0] == '\0')
|
|
return NULL;
|
|
else
|
|
return itr->dent;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int split_filename(char *filename, char **dirname, char **basename)
|
|
{
|
|
char *p, *last_slash, *last_slash_cont;
|
|
|
|
again:
|
|
p = filename;
|
|
last_slash = NULL;
|
|
last_slash_cont = NULL;
|
|
while (*p) {
|
|
if (ISDIRDELIM(*p)) {
|
|
last_slash = p;
|
|
last_slash_cont = p;
|
|
/* continuous slashes */
|
|
while (ISDIRDELIM(*p))
|
|
last_slash_cont = p++;
|
|
if (!*p)
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
if (last_slash) {
|
|
if (last_slash_cont == (filename + strlen(filename) - 1)) {
|
|
/* remove trailing slashes */
|
|
*last_slash = '\0';
|
|
goto again;
|
|
}
|
|
|
|
if (last_slash == filename) {
|
|
/* avoid ""(null) directory */
|
|
*dirname = "/";
|
|
} else {
|
|
*last_slash = '\0';
|
|
*dirname = filename;
|
|
}
|
|
|
|
*last_slash_cont = '\0';
|
|
*basename = last_slash_cont + 1;
|
|
} else {
|
|
*dirname = "/"; /* root by default */
|
|
*basename = filename;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* normalize_longname() - check long file name and convert to lower case
|
|
*
|
|
* We assume here that the FAT file system is using an 8bit code page.
|
|
* Linux typically uses CP437, EDK2 assumes CP1250.
|
|
*
|
|
* @l_filename: preallocated buffer receiving the normalized name
|
|
* @filename: filename to normalize
|
|
* Return: 0 on success, -1 on failure
|
|
*/
|
|
static int normalize_longname(char *l_filename, const char *filename)
|
|
{
|
|
const char *p, illegal[] = "<>:\"/\\|?*";
|
|
|
|
if (strlen(filename) >= VFAT_MAXLEN_BYTES)
|
|
return -1;
|
|
|
|
for (p = filename; *p; ++p) {
|
|
if ((unsigned char)*p < 0x20)
|
|
return -1;
|
|
if (strchr(illegal, *p))
|
|
return -1;
|
|
}
|
|
|
|
strcpy(l_filename, filename);
|
|
downcase(l_filename, VFAT_MAXLEN_BYTES);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
|
|
loff_t size, loff_t *actwrite)
|
|
{
|
|
dir_entry *retdent;
|
|
fsdata datablock = { .fatbuf = NULL, };
|
|
fsdata *mydata = &datablock;
|
|
fat_itr *itr = NULL;
|
|
int ret = -1;
|
|
char *filename_copy, *parent, *basename;
|
|
char l_filename[VFAT_MAXLEN_BYTES];
|
|
|
|
debug("writing %s\n", filename);
|
|
|
|
filename_copy = strdup(filename);
|
|
if (!filename_copy)
|
|
return -ENOMEM;
|
|
|
|
split_filename(filename_copy, &parent, &basename);
|
|
if (!strlen(basename)) {
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
filename = basename;
|
|
if (normalize_longname(l_filename, filename)) {
|
|
printf("FAT: illegal filename (%s)\n", filename);
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
itr = malloc_cache_aligned(sizeof(fat_itr));
|
|
if (!itr) {
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
ret = fat_itr_root(itr, &datablock);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
total_sector = datablock.total_sect;
|
|
|
|
ret = fat_itr_resolve(itr, parent, TYPE_DIR);
|
|
if (ret) {
|
|
printf("%s: doesn't exist (%d)\n", parent, ret);
|
|
goto exit;
|
|
}
|
|
|
|
retdent = find_directory_entry(itr, l_filename);
|
|
|
|
if (retdent) {
|
|
if (fat_itr_isdir(itr)) {
|
|
ret = -EISDIR;
|
|
goto exit;
|
|
}
|
|
|
|
/* A file exists */
|
|
if (pos == -1)
|
|
/* Append to the end */
|
|
pos = FAT2CPU32(retdent->size);
|
|
if (pos > retdent->size) {
|
|
/* No hole allowed */
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
/* Update file size in a directory entry */
|
|
retdent->size = cpu_to_le32(pos + size);
|
|
} else {
|
|
/* Create a new file */
|
|
char shortname[SHORT_NAME_SIZE];
|
|
int ndent;
|
|
|
|
if (itr->is_root) {
|
|
/* root dir cannot have "." or ".." */
|
|
if (!strcmp(l_filename, ".") ||
|
|
!strcmp(l_filename, "..")) {
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if (pos) {
|
|
/* No hole allowed */
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
/* Check if long name is needed */
|
|
ndent = set_name(itr, filename, shortname);
|
|
if (ndent < 0) {
|
|
ret = ndent;
|
|
goto exit;
|
|
}
|
|
ret = fat_find_empty_dentries(itr, ndent);
|
|
if (ret)
|
|
goto exit;
|
|
if (ndent > 1) {
|
|
/* Set long name entries */
|
|
ret = fill_dir_slot(itr, filename, shortname);
|
|
if (ret)
|
|
goto exit;
|
|
}
|
|
|
|
/* Set short name entry */
|
|
fill_dentry(itr->fsdata, itr->dent, shortname, 0, size,
|
|
ATTR_ARCH);
|
|
|
|
retdent = itr->dent;
|
|
}
|
|
|
|
ret = set_contents(mydata, retdent, pos, buffer, size, actwrite);
|
|
if (ret < 0) {
|
|
printf("Error: writing contents\n");
|
|
ret = -EIO;
|
|
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");
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
/* Write directory table to device */
|
|
ret = flush_dir(itr);
|
|
if (ret) {
|
|
printf("Error: writing directory entry\n");
|
|
ret = -EIO;
|
|
}
|
|
|
|
exit:
|
|
free(filename_copy);
|
|
free(mydata->fatbuf);
|
|
free(itr);
|
|
return ret;
|
|
}
|
|
|
|
int file_fat_write(const char *filename, void *buffer, loff_t offset,
|
|
loff_t maxsize, loff_t *actwrite)
|
|
{
|
|
return file_fat_write_at(filename, offset, buffer, maxsize, actwrite);
|
|
}
|
|
|
|
static int fat_dir_entries(fat_itr *itr)
|
|
{
|
|
fat_itr *dirs;
|
|
fsdata fsdata = { .fatbuf = NULL, }, *mydata = &fsdata;
|
|
/* for FATBUFSIZE */
|
|
int count;
|
|
|
|
dirs = malloc_cache_aligned(sizeof(fat_itr));
|
|
if (!dirs) {
|
|
debug("Error: allocating memory\n");
|
|
count = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* duplicate fsdata */
|
|
fat_itr_child(dirs, itr);
|
|
fsdata = *dirs->fsdata;
|
|
|
|
/* allocate local fat buffer */
|
|
fsdata.fatbuf = malloc_cache_aligned(FATBUFSIZE);
|
|
if (!fsdata.fatbuf) {
|
|
debug("Error: allocating memory\n");
|
|
count = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
fsdata.fatbufnum = -1;
|
|
dirs->fsdata = &fsdata;
|
|
|
|
for (count = 0; fat_itr_next(dirs); count++)
|
|
;
|
|
|
|
exit:
|
|
free(fsdata.fatbuf);
|
|
free(dirs);
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* delete_single_dentry() - delete a single directory entry
|
|
*
|
|
* @itr: directory iterator
|
|
* Return: 0 for success
|
|
*/
|
|
static int delete_single_dentry(fat_itr *itr)
|
|
{
|
|
struct dir_entry *dent = itr->dent;
|
|
|
|
memset(dent, 0, sizeof(*dent));
|
|
dent->name[0] = DELETED_FLAG;
|
|
|
|
if (!itr->remaining) {
|
|
if (flush_dir(itr)) {
|
|
printf("error: writing directory entry\n");
|
|
return -EIO;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* delete_long_name() - delete long name directory entries
|
|
*
|
|
* @itr: directory iterator
|
|
* Return: 0 for success
|
|
*/
|
|
static int delete_long_name(fat_itr *itr)
|
|
{
|
|
struct dir_entry *dent = itr->dent;
|
|
int seqn = itr->dent->name[0] & ~LAST_LONG_ENTRY_MASK;
|
|
|
|
while (seqn--) {
|
|
int ret;
|
|
|
|
ret = delete_single_dentry(itr);
|
|
if (ret)
|
|
return ret;
|
|
dent = next_dent(itr);
|
|
if (!dent)
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* delete_dentry_long() - remove directory entry
|
|
*
|
|
* @itr: directory iterator
|
|
* Return: 0 for success
|
|
*/
|
|
static int delete_dentry_long(fat_itr *itr)
|
|
{
|
|
fsdata *mydata = itr->fsdata;
|
|
dir_entry *dent = itr->dent;
|
|
|
|
/* free cluster blocks */
|
|
clear_fatent(mydata, START(dent));
|
|
if (flush_dirty_fat_buffer(mydata) < 0) {
|
|
printf("Error: flush fat buffer\n");
|
|
return -EIO;
|
|
}
|
|
/* Position to first directory entry for long name */
|
|
if (itr->clust != itr->dent_clust) {
|
|
int ret;
|
|
|
|
ret = fat_move_to_cluster(itr, itr->dent_clust);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
itr->dent = itr->dent_start;
|
|
itr->remaining = itr->dent_rem;
|
|
dent = itr->dent_start;
|
|
/* Delete long name */
|
|
if ((dent->attr & ATTR_VFAT) == ATTR_VFAT &&
|
|
(dent->name[0] & LAST_LONG_ENTRY_MASK)) {
|
|
int ret;
|
|
|
|
ret = delete_long_name(itr);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
/* Delete short name */
|
|
delete_single_dentry(itr);
|
|
if (flush_dir(itr)) {
|
|
printf("error: writing directory entry\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_unlink(const char *filename)
|
|
{
|
|
fsdata fsdata = { .fatbuf = NULL, };
|
|
fat_itr *itr = NULL;
|
|
int n_entries, ret;
|
|
char *filename_copy, *dirname, *basename;
|
|
|
|
filename_copy = strdup(filename);
|
|
if (!filename_copy) {
|
|
printf("Error: allocating memory\n");
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
split_filename(filename_copy, &dirname, &basename);
|
|
|
|
if (!strcmp(dirname, "/") && !strcmp(basename, "")) {
|
|
printf("Error: cannot remove root\n");
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
itr = malloc_cache_aligned(sizeof(fat_itr));
|
|
if (!itr) {
|
|
printf("Error: allocating memory\n");
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
ret = fat_itr_root(itr, &fsdata);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
total_sector = fsdata.total_sect;
|
|
|
|
ret = fat_itr_resolve(itr, dirname, TYPE_DIR);
|
|
if (ret) {
|
|
printf("%s: doesn't exist (%d)\n", dirname, ret);
|
|
ret = -ENOENT;
|
|
goto exit;
|
|
}
|
|
|
|
if (!find_directory_entry(itr, basename)) {
|
|
printf("%s: doesn't exist\n", basename);
|
|
ret = -ENOENT;
|
|
goto exit;
|
|
}
|
|
|
|
if (fat_itr_isdir(itr)) {
|
|
n_entries = fat_dir_entries(itr);
|
|
if (n_entries < 0) {
|
|
ret = n_entries;
|
|
goto exit;
|
|
}
|
|
if (n_entries > 2) {
|
|
printf("Error: directory is not empty: %d\n",
|
|
n_entries);
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
ret = delete_dentry_long(itr);
|
|
|
|
exit:
|
|
free(fsdata.fatbuf);
|
|
free(itr);
|
|
free(filename_copy);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int fat_mkdir(const char *new_dirname)
|
|
{
|
|
dir_entry *retdent;
|
|
fsdata datablock = { .fatbuf = NULL, };
|
|
fsdata *mydata = &datablock;
|
|
fat_itr *itr = NULL;
|
|
char *dirname_copy, *parent, *dirname;
|
|
char l_dirname[VFAT_MAXLEN_BYTES];
|
|
int ret = -1;
|
|
loff_t actwrite;
|
|
unsigned int bytesperclust;
|
|
dir_entry *dotdent = NULL;
|
|
|
|
dirname_copy = strdup(new_dirname);
|
|
if (!dirname_copy)
|
|
goto exit;
|
|
|
|
split_filename(dirname_copy, &parent, &dirname);
|
|
if (!strlen(dirname)) {
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
if (normalize_longname(l_dirname, dirname)) {
|
|
printf("FAT: illegal filename (%s)\n", dirname);
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
itr = malloc_cache_aligned(sizeof(fat_itr));
|
|
if (!itr) {
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
ret = fat_itr_root(itr, &datablock);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
total_sector = datablock.total_sect;
|
|
|
|
ret = fat_itr_resolve(itr, parent, TYPE_DIR);
|
|
if (ret) {
|
|
printf("%s: doesn't exist (%d)\n", parent, ret);
|
|
goto exit;
|
|
}
|
|
|
|
retdent = find_directory_entry(itr, l_dirname);
|
|
|
|
if (retdent) {
|
|
printf("%s: already exists\n", l_dirname);
|
|
ret = -EEXIST;
|
|
goto exit;
|
|
} else {
|
|
char shortname[SHORT_NAME_SIZE];
|
|
int ndent;
|
|
|
|
if (itr->is_root) {
|
|
/* root dir cannot have "." or ".." */
|
|
if (!strcmp(l_dirname, ".") ||
|
|
!strcmp(l_dirname, "..")) {
|
|
ret = -EINVAL;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/* Check if long name is needed */
|
|
ndent = set_name(itr, dirname, shortname);
|
|
if (ndent < 0) {
|
|
ret = ndent;
|
|
goto exit;
|
|
}
|
|
ret = fat_find_empty_dentries(itr, ndent);
|
|
if (ret)
|
|
goto exit;
|
|
if (ndent > 1) {
|
|
/* Set long name entries */
|
|
ret = fill_dir_slot(itr, dirname, shortname);
|
|
if (ret)
|
|
goto exit;
|
|
}
|
|
|
|
/* Set attribute as archive for regular file */
|
|
fill_dentry(itr->fsdata, itr->dent, shortname, 0, 0,
|
|
ATTR_DIR | ATTR_ARCH);
|
|
|
|
retdent = itr->dent;
|
|
}
|
|
|
|
/* Default entries */
|
|
bytesperclust = mydata->clust_size * mydata->sect_size;
|
|
dotdent = malloc_cache_aligned(bytesperclust);
|
|
if (!dotdent) {
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
memset(dotdent, 0, bytesperclust);
|
|
|
|
memcpy(dotdent[0].name, ". ", 8);
|
|
memcpy(dotdent[0].ext, " ", 3);
|
|
dotdent[0].attr = ATTR_DIR | ATTR_ARCH;
|
|
|
|
memcpy(dotdent[1].name, ".. ", 8);
|
|
memcpy(dotdent[1].ext, " ", 3);
|
|
dotdent[1].attr = ATTR_DIR | ATTR_ARCH;
|
|
|
|
if (itr->is_root)
|
|
set_start_cluster(mydata, &dotdent[1], 0);
|
|
else
|
|
set_start_cluster(mydata, &dotdent[1], itr->start_clust);
|
|
|
|
ret = set_contents(mydata, retdent, 0, (__u8 *)dotdent,
|
|
bytesperclust, &actwrite);
|
|
if (ret < 0) {
|
|
printf("Error: writing contents\n");
|
|
goto exit;
|
|
}
|
|
/* Write twice for "." */
|
|
set_start_cluster(mydata, &dotdent[0], START(retdent));
|
|
ret = set_contents(mydata, retdent, 0, (__u8 *)dotdent,
|
|
bytesperclust, &actwrite);
|
|
if (ret < 0) {
|
|
printf("Error: writing contents\n");
|
|
goto exit;
|
|
}
|
|
|
|
/* 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 = flush_dir(itr);
|
|
if (ret)
|
|
printf("Error: writing directory entry\n");
|
|
|
|
exit:
|
|
free(dirname_copy);
|
|
free(mydata->fatbuf);
|
|
free(itr);
|
|
free(dotdent);
|
|
return ret;
|
|
}
|