+// SPDX-License-Identifier: GPL-2.0+
/*
* fat.c
*
*
* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
* 2003-03-10 - kharris@nexus-tech.net - ported to uboot
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/compiler.h>
#include <linux/ctype.h>
-#ifdef CONFIG_SUPPORT_VFAT
-static const int vfat_enabled = 1;
-#else
-static const int vfat_enabled = 0;
-#endif
-
/*
* Convert a string to lowercase. Converts at most 'len' characters,
* 'len' may be larger than the length of 'str' if 'str' is NULL
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);
+ debug("FAT: Misaligned buffer address (%p)\n", buffer);
while (size >= mydata->sect_size) {
ret = disk_read(startsect++, 1, tmpbuf);
}
/*
- * TODO these should go away once fat_write is reworked to use the
- * directory iterator
- */
-__u8 get_dentfromdir_block[MAX_CLUSTSIZE]
- __aligned(ARCH_DMA_MINALIGN);
-__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
- __aligned(ARCH_DMA_MINALIGN);
-
-/*
* Read boot sector and volume info from a FAT filesystem
*/
static int
if (mydata->fatsize == 32) {
mydata->fatlength = bs.fat32_length;
+ mydata->total_sect = bs.total_sect;
} else {
mydata->fatlength = bs.fat_length;
+ mydata->total_sect = (bs.sectors[1] << 8) + bs.sectors[0];
+ if (!mydata->total_sect)
+ mydata->total_sect = bs.total_sect;
}
+ if (!mydata->total_sect) /* unlikely */
+ mydata->total_sect = (u32)cur_part_info.size;
+ mydata->fats = bs.fats;
mydata->fat_sect = bs.reserved;
mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats;
mydata->sect_size, cur_part_info.blksz);
return -1;
}
+ if (mydata->clust_size == 0) {
+ printf("Error: FAT cluster size not set\n");
+ return -1;
+ }
+ if ((unsigned int)mydata->clust_size * mydata->sect_size >
+ MAX_CLUSTSIZE) {
+ printf("Error: FAT cluster size too big (cs=%u, max=%u)\n",
+ (unsigned int)mydata->clust_size * mydata->sect_size,
+ MAX_CLUSTSIZE);
+ return -1;
+ }
if (mydata->fatsize == 32) {
mydata->data_begin = mydata->rootdir_sect -
return -1;
}
- if (vfat_enabled)
- debug("VFAT Support enabled\n");
-
debug("FAT%d, fat_sect: %d, fatlength: %d\n",
mydata->fatsize, mydata->fat_sect, mydata->fatlength);
debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
typedef struct {
fsdata *fsdata; /* filesystem parameters */
+ unsigned start_clust; /* first cluster */
unsigned clust; /* current cluster */
+ unsigned next_clust; /* next cluster if remaining == 0 */
int last_cluster; /* set once we've read last cluster */
int is_root; /* is iterator at root directory */
int remaining; /* remaining dent's in current cluster */
return -ENXIO;
itr->fsdata = fsdata;
+ itr->start_clust = 0;
itr->clust = fsdata->root_cluster;
+ itr->next_clust = fsdata->root_cluster;
itr->dent = NULL;
itr->remaining = 0;
itr->last_cluster = 0;
assert(fat_itr_isdir(parent));
itr->fsdata = parent->fsdata;
+ itr->start_clust = clustnum;
if (clustnum > 0) {
itr->clust = clustnum;
+ itr->next_clust = clustnum;
itr->is_root = 0;
} else {
itr->clust = parent->fsdata->root_cluster;
+ itr->next_clust = parent->fsdata->root_cluster;
itr->is_root = 1;
}
itr->dent = NULL;
if (itr->last_cluster)
return NULL;
- sect = clust_to_sect(itr->fsdata, itr->clust);
+ if (itr->fsdata->fatsize != 32 && itr->is_root)
+ sect = mydata->rootdir_sect;
+ else
+ sect = clust_to_sect(itr->fsdata, itr->next_clust);
debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n",
sect, itr->fsdata->clust_size, DIRENTSPERBLOCK);
return NULL;
}
+ itr->clust = itr->next_clust;
if (itr->is_root && itr->fsdata->fatsize != 32) {
- itr->clust++;
- sect = clust_to_sect(itr->fsdata, itr->clust);
+ itr->next_clust++;
+ sect = clust_to_sect(itr->fsdata, itr->next_clust);
if (sect - itr->fsdata->rootdir_sect >=
itr->fsdata->rootdir_size) {
- debug("cursect: 0x%x\n", itr->clust);
+ debug("nextclust: 0x%x\n", itr->next_clust);
itr->last_cluster = 1;
}
} else {
- itr->clust = get_fatent(itr->fsdata, itr->clust);
- if (CHECK_CLUST(itr->clust, itr->fsdata->fatsize)) {
- debug("cursect: 0x%x\n", itr->clust);
+ itr->next_clust = get_fatent(itr->fsdata, itr->next_clust);
+ if (CHECK_CLUST(itr->next_clust, itr->fsdata->fatsize)) {
+ debug("nextclust: 0x%x\n", itr->next_clust);
itr->last_cluster = 1;
}
}
itr->fsdata->clust_size;
/* have we reached the last cluster? */
- if (!dent)
+ if (!dent) {
+ /* a sign for no more entries left */
+ itr->dent = NULL;
return NULL;
+ }
itr->remaining = nbytes / sizeof(dir_entry) - 1;
itr->dent = dent;
slot2str((dir_slot *)dent, buf, &idx);
+ if (n + idx >= sizeof(itr->l_name))
+ return NULL;
+
/* shift accumulated long-name up and copy new part in: */
memmove(itr->l_name + idx, itr->l_name, n);
memcpy(itr->l_name, buf, idx);
continue;
if (dent->attr & ATTR_VOLUME) {
- if (vfat_enabled &&
- (dent->attr & ATTR_VFAT) == ATTR_VFAT &&
+ if ((dent->attr & ATTR_VFAT) == ATTR_VFAT &&
(dent->name[0] & LAST_LONG_ENTRY_MASK)) {
dent = extract_vfat_name(itr);
if (!dent)
while (next[0] && !ISDIRDELIM(next[0]))
next++;
+ if (itr->is_root) {
+ /* root dir doesn't have "." nor ".." */
+ if ((((next - path) == 1) && !strncmp(path, ".", 1)) ||
+ (((next - path) == 2) && !strncmp(path, "..", 2))) {
+ /* point back to itself */
+ itr->clust = itr->fsdata->root_cluster;
+ itr->next_clust = itr->fsdata->root_cluster;
+ itr->dent = NULL;
+ itr->remaining = 0;
+ itr->last_cluster = 0;
+
+ if (next[0] == 0) {
+ if (type & TYPE_DIR)
+ return 0;
+ else
+ return -ENOENT;
+ }
+
+ return fat_itr_resolve(itr, next, type);
+ }
+ }
+
while (fat_itr_next(itr)) {
int match = 0;
unsigned n = max(strlen(itr->name), (size_t)(next - path));
if (ret)
goto out_free_both;
- printf("reading %s\n", filename);
+ debug("reading %s at pos %llu\n", filename, pos);
ret = get_contents(&fsdata, itr->dent, pos, buffer, maxsize, actread);
out_free_both:
projects / platform / kernel / u-boot.git / blobdiff