diff options
Diffstat (limited to 'fs/fat/fat.c')
-rw-r--r-- | fs/fat/fat.c | 89 |
1 files changed, 44 insertions, 45 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c index 80156c8..393c378 100644 --- a/fs/fat/fat.c +++ b/fs/fat/fat.c @@ -46,7 +46,6 @@ static void downcase(char *str) } static block_dev_desc_t *cur_dev; -static unsigned int cur_part_nr; static disk_partition_t cur_part_info; #define DOS_BOOT_MAGIC_OFFSET 0x1fe @@ -62,43 +61,12 @@ static int disk_read(__u32 block, __u32 nr_blocks, void *buf) cur_part_info.start + block, nr_blocks, buf); } -int fat_register_device(block_dev_desc_t * dev_desc, int part_no) +int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info) { ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); - /* First close any currently found FAT filesystem */ - cur_dev = NULL; - -#if (defined(CONFIG_CMD_IDE) || \ - defined(CONFIG_CMD_SATA) || \ - defined(CONFIG_CMD_SCSI) || \ - defined(CONFIG_CMD_USB) || \ - defined(CONFIG_MMC) || \ - defined(CONFIG_SYSTEMACE) ) - - /* Read the partition table, if present */ - if (!get_partition_info(dev_desc, part_no, &cur_part_info)) { - cur_dev = dev_desc; - cur_part_nr = part_no; - } -#endif - - /* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */ - if (!cur_dev) { - if (part_no != 0) { - printf("** Partition %d not valid on device %d **\n", - part_no, dev_desc->dev); - return -1; - } - - cur_dev = dev_desc; - cur_part_nr = 1; - cur_part_info.start = 0; - cur_part_info.size = dev_desc->lba; - cur_part_info.blksz = dev_desc->blksz; - memset(cur_part_info.name, 0, sizeof(cur_part_info.name)); - memset(cur_part_info.type, 0, sizeof(cur_part_info.type)); - } + cur_dev = dev_desc; + cur_part_info = *info; /* Make sure it has a valid FAT header */ if (disk_read(0, 1, buffer) != 1) { @@ -122,6 +90,34 @@ int fat_register_device(block_dev_desc_t * dev_desc, int part_no) return -1; } +int fat_register_device(block_dev_desc_t *dev_desc, int part_no) +{ + disk_partition_t info; + + /* First close any currently found FAT filesystem */ + cur_dev = NULL; + + /* Read the partition table, if present */ + if (get_partition_info(dev_desc, part_no, &info)) { + if (part_no != 0) { + printf("** Partition %d not valid on device %d **\n", + part_no, dev_desc->dev); + return -1; + } + + info.start = 0; + info.size = dev_desc->lba; + info.blksz = dev_desc->blksz; + info.name[0] = 0; + info.type[0] = 0; + info.bootable = 0; +#ifdef CONFIG_PARTITION_UUIDS + info.uuid[0] = 0; +#endif + } + + return fat_set_blk_dev(dev_desc, &info); +} /* * Get the first occurence of a directory delimiter ('/' or '\') in a string. @@ -567,15 +563,16 @@ get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, } /* Calculate short name checksum */ -static __u8 mkcksum(const char *str) +static __u8 mkcksum(const char name[8], const char ext[3]) { int i; __u8 ret = 0; - for (i = 0; i < 11; i++) { - ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i]; - } + for (i = 0; i < sizeof(name); i++) + ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i]; + for (i = 0; i < sizeof(ext); i++) + ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i]; return ret; } @@ -678,7 +675,8 @@ static dir_entry *get_dentfromdir(fsdata *mydata, int startsect, return NULL; } #ifdef CONFIG_SUPPORT_VFAT - if (dols && mkcksum(dentptr->name) == prevcksum) { + __u8 csum = mkcksum(dentptr->name, dentptr->ext); + if (dols && csum == prevcksum) { prevcksum = 0xffff; dentptr++; continue; @@ -946,13 +944,16 @@ do_fat_read_at(const char *filename, unsigned long pos, void *buffer, for (i = 0; i < DIRENTSPERBLOCK; i++) { char s_name[14], l_name[VFAT_MAXLEN_BYTES]; + __u8 csum; l_name[0] = '\0'; if (dentptr->name[0] == DELETED_FLAG) { dentptr++; continue; } - if ((dentptr->attr & ATTR_VOLUME)) { + + csum = mkcksum(dentptr->name, dentptr->ext); + if (dentptr->attr & ATTR_VOLUME) { #ifdef CONFIG_SUPPORT_VFAT if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { @@ -1015,8 +1016,7 @@ do_fat_read_at(const char *filename, unsigned long pos, void *buffer, goto exit; } #ifdef CONFIG_SUPPORT_VFAT - else if (dols == LS_ROOT && - mkcksum(dentptr->name) == prevcksum) { + else if (dols == LS_ROOT && csum == prevcksum) { prevcksum = 0xffff; dentptr++; continue; @@ -1235,8 +1235,7 @@ int file_fat_detectfs(void) vol_label[11] = '\0'; volinfo.fs_type[5] = '\0'; - printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr, - volinfo.fs_type, vol_label); + printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label); return 0; } |