#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
+#include <limits.h>
#include <errno.h>
-#include <math.h>
#include <locale.h>
+#include <time.h>
#include "exfat_ondisk.h"
#include "libexfat.h"
struct exfat_mkfs_info finfo;
+/* random serial generator based on current time */
+static unsigned int get_new_serial(void)
+{
+ struct timespec ts;
+
+ if (clock_gettime(CLOCK_REALTIME, &ts)) {
+ /* set 0000-0000 on error */
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ }
+
+ return (unsigned int)(ts.tv_nsec << 12 | ts.tv_sec);
+}
+
static void exfat_setup_boot_sector(struct pbr *ppbr,
struct exfat_blk_dev *bd, struct exfat_user_input *ui)
{
struct bpb64 *pbpb = &ppbr->bpb;
struct bsx64 *pbsx = &ppbr->bsx;
+ unsigned int i;
/* Fill exfat BIOS paramemter block */
pbpb->jmp_boot[0] = 0xeb;
memset(pbpb->res_zero, 0, 53);
/* Fill exfat extend BIOS paramemter block */
- pbsx->vol_offset = 0;
+ pbsx->vol_offset = cpu_to_le64(bd->offset / bd->sector_size);
pbsx->vol_length = cpu_to_le64(bd->size / bd->sector_size);
pbsx->fat_offset = cpu_to_le32(finfo.fat_byte_off / bd->sector_size);
pbsx->fat_length = cpu_to_le32(finfo.fat_byte_len / bd->sector_size);
pbsx->clu_offset = cpu_to_le32(finfo.clu_byte_off / bd->sector_size);
pbsx->clu_count = cpu_to_le32(finfo.total_clu_cnt);
pbsx->root_cluster = cpu_to_le32(finfo.root_start_clu);
- pbsx->vol_serial = cpu_to_le32(1234);
+ pbsx->vol_serial = cpu_to_le32(finfo.volume_serial);
pbsx->vol_flags = 0;
pbsx->sect_size_bits = bd->sector_size_bits;
- pbsx->sect_per_clus_bits = log2(ui->cluster_size / bd->sector_size);
+ pbsx->sect_per_clus_bits = 0;
+ /* Compute base 2 logarithm of ui->cluster_size / bd->sector_size */
+ for (i = ui->cluster_size / bd->sector_size; i > 1; i /= 2)
+ pbsx->sect_per_clus_bits++;
pbsx->num_fats = 1;
/* fs_version[0] : minor and fs_version[1] : major */
pbsx->fs_version[0] = 0;
memset(ppbr->boot_code, 0, 390);
ppbr->signature = cpu_to_le16(PBR_SIGNATURE);
+ exfat_debug("Volume Offset(sectors) : %" PRIu64 "\n",
+ le64_to_cpu(pbsx->vol_offset));
exfat_debug("Volume Length(sectors) : %" PRIu64 "\n",
le64_to_cpu(pbsx->vol_length));
exfat_debug("FAT Offset(sector offset) : %u\n",
le32_to_cpu(pbsx->fat_length));
exfat_debug("Cluster Heap Offset (sector offset) : %u\n",
le32_to_cpu(pbsx->clu_offset));
- exfat_debug("Cluster Count (sectors) : %u\n",
+ exfat_debug("Cluster Count : %u\n",
le32_to_cpu(pbsx->clu_count));
exfat_debug("Root Cluster (cluster offset) : %u\n",
le32_to_cpu(pbsx->root_cluster));
+ exfat_debug("Volume Serial : 0x%x\n", le32_to_cpu(pbsx->vol_serial));
exfat_debug("Sector Size Bits : %u\n",
pbsx->sect_size_bits);
exfat_debug("Sector per Cluster bits : %u\n",
pbsx->sect_per_clus_bits);
}
-static int exfat_write_sector(struct exfat_blk_dev *bd, void *buf,
- unsigned int sec_off)
-{
- int bytes;
- unsigned long long offset = sec_off * bd->sector_size;
-
- lseek(bd->dev_fd, offset, SEEK_SET);
- bytes = write(bd->dev_fd, buf, bd->sector_size);
- if (bytes != (int)bd->sector_size) {
- exfat_err("write failed, sec_off : %u, bytes : %d\n", sec_off,
- bytes);
- return -1;
- }
- return 0;
-}
-
static int exfat_write_boot_sector(struct exfat_blk_dev *bd,
struct exfat_user_input *ui, unsigned int *checksum,
bool is_backup)
return ret;
}
-static int exfat_write_checksum_sector(struct exfat_blk_dev *bd,
- unsigned int checksum, bool is_backup)
-{
- __le32 *checksum_buf;
- int ret = 0;
- unsigned int i;
- unsigned int sec_idx = CHECKSUM_SEC_IDX;
-
- checksum_buf = malloc(bd->sector_size);
- if (!checksum_buf)
- return -1;
-
- if (is_backup)
- sec_idx += BACKUP_BOOT_SEC_IDX;
-
- for (i = 0; i < bd->sector_size / sizeof(int); i++)
- checksum_buf[i] = cpu_to_le32(checksum);
-
- ret = exfat_write_sector(bd, checksum_buf, sec_idx);
- if (ret) {
- exfat_err("checksum sector write failed\n");
- goto free;
- }
-
-free:
- free(checksum_buf);
- return ret;
-}
-
static int exfat_create_volume_boot_record(struct exfat_blk_dev *bd,
struct exfat_user_input *ui, bool is_backup)
{
static void usage(void)
{
- fprintf(stderr, "Usage: mkfs.exfat\n");
- fprintf(stderr, "\t-L | --volume-label=label Set volume label\n");
- fprintf(stderr, "\t-c | --cluster-size=size(or suffixed by 'K' or 'M') Specify cluster size\n");
- fprintf(stderr, "\t-f | --full-format Full format\n");
- fprintf(stderr, "\t-V | --version Show version\n");
- fprintf(stderr, "\t-v | --verbose Print debug\n");
- fprintf(stderr, "\t-h | --help Show help\n");
+ fputs("Usage: mkfs.exfat\n"
+ "\t-L | --volume-label=label Set volume label\n"
+ "\t-c | --cluster-size=size(or suffixed by 'K' or 'M') Specify cluster size\n"
+ "\t-b | --boundary-align=size(or suffixed by 'K' or 'M') Specify boundary alignment\n"
+ "\t --pack-bitmap Move bitmap into FAT segment\n"
+ "\t-f | --full-format Full format\n"
+ "\t-V | --version Show version\n"
+ "\t-v | --verbose Print debug\n"
+ "\t-h | --help Show help\n",
+ stderr);
exit(EXIT_FAILURE);
}
-static struct option opts[] = {
+#define PACK_BITMAP (CHAR_MAX + 1)
+
+static const struct option opts[] = {
{"volume-label", required_argument, NULL, 'L' },
{"cluster-size", required_argument, NULL, 'c' },
+ {"boundary-align", required_argument, NULL, 'b' },
+ {"pack-bitmap", no_argument, NULL, PACK_BITMAP },
{"full-format", no_argument, NULL, 'f' },
{"version", no_argument, NULL, 'V' },
{"verbose", no_argument, NULL, 'v' },
{NULL, 0, NULL, 0 }
};
+/*
+ * Moves the bitmap to just before the alignment boundary if there is space
+ * between the boundary and the end of the FAT. This may allow the FAT and the
+ * bitmap to share the same allocation unit on flash media, thereby improving
+ * performance and endurance.
+ */
+static int exfat_pack_bitmap(const struct exfat_user_input *ui)
+{
+ unsigned int fat_byte_end = finfo.fat_byte_off + finfo.fat_byte_len,
+ bitmap_byte_len = finfo.bitmap_byte_len,
+ bitmap_clu_len = round_up(bitmap_byte_len, ui->cluster_size),
+ bitmap_clu_cnt, total_clu_cnt, new_bitmap_clu_len;
+
+ for (;;) {
+ bitmap_clu_cnt = bitmap_clu_len / ui->cluster_size;
+ if (finfo.clu_byte_off - bitmap_clu_len < fat_byte_end ||
+ finfo.total_clu_cnt > EXFAT_MAX_NUM_CLUSTER -
+ bitmap_clu_cnt)
+ return -1;
+ total_clu_cnt = finfo.total_clu_cnt + bitmap_clu_cnt;
+ bitmap_byte_len = round_up(total_clu_cnt, 8) / 8;
+ new_bitmap_clu_len = round_up(bitmap_byte_len, ui->cluster_size);
+ if (new_bitmap_clu_len == bitmap_clu_len) {
+ finfo.clu_byte_off -= bitmap_clu_len;
+ finfo.total_clu_cnt = total_clu_cnt;
+ finfo.bitmap_byte_off -= bitmap_clu_len;
+ finfo.bitmap_byte_len = bitmap_byte_len;
+ return 0;
+ }
+ bitmap_clu_len = new_bitmap_clu_len;
+ }
+}
+
static int exfat_build_mkfs_info(struct exfat_blk_dev *bd,
struct exfat_user_input *ui)
{
- if (ui->cluster_size > DEFAULT_CLUSTER_SIZE)
- finfo.fat_byte_off = ui->cluster_size;
- else
- finfo.fat_byte_off = DEFAULT_CLUSTER_SIZE;
+ unsigned long long total_clu_cnt;
+ int clu_len;
+
+ if (ui->boundary_align < bd->sector_size) {
+ exfat_err("boundary alignment is too small (min %d)\n",
+ bd->sector_size);
+ return -1;
+ }
+ finfo.fat_byte_off = round_up(bd->offset + 24 * bd->sector_size,
+ ui->boundary_align) - bd->offset;
finfo.fat_byte_len = round_up((bd->num_clusters * sizeof(int)),
ui->cluster_size);
- finfo.clu_byte_off = round_up(finfo.fat_byte_off + finfo.fat_byte_len,
- DEFAULT_CLUSTER_SIZE);
- finfo.total_clu_cnt = (bd->size - finfo.clu_byte_off) /
- ui->cluster_size;
- if (finfo.total_clu_cnt > EXFAT_MAX_NUM_CLUSTER) {
+ finfo.clu_byte_off = round_up(bd->offset + finfo.fat_byte_off +
+ finfo.fat_byte_len, ui->boundary_align) - bd->offset;
+ if (bd->size <= finfo.clu_byte_off) {
+ exfat_err("boundary alignment is too big\n");
+ return -1;
+ }
+ total_clu_cnt = (bd->size - finfo.clu_byte_off) / ui->cluster_size;
+ if (total_clu_cnt > EXFAT_MAX_NUM_CLUSTER) {
exfat_err("cluster size is too small\n");
return -1;
}
+ finfo.total_clu_cnt = (unsigned int) total_clu_cnt;
finfo.bitmap_byte_off = finfo.clu_byte_off;
finfo.bitmap_byte_len = round_up(finfo.total_clu_cnt, 8) / 8;
- finfo.ut_start_clu = round_up(EXFAT_REVERVED_CLUSTERS *
- ui->cluster_size + finfo.bitmap_byte_len, ui->cluster_size) /
- ui->cluster_size;
- finfo.ut_byte_off = round_up(finfo.bitmap_byte_off +
- finfo.bitmap_byte_len, ui->cluster_size);
+ if (ui->pack_bitmap)
+ exfat_pack_bitmap(ui);
+ clu_len = round_up(finfo.bitmap_byte_len, ui->cluster_size);
+
+ finfo.ut_start_clu = EXFAT_FIRST_CLUSTER + clu_len / ui->cluster_size;
+ finfo.ut_byte_off = finfo.bitmap_byte_off + clu_len;
finfo.ut_byte_len = EXFAT_UPCASE_TABLE_SIZE;
- finfo.root_start_clu = round_up(finfo.ut_start_clu * ui->cluster_size
- + finfo.ut_byte_len, ui->cluster_size) / ui->cluster_size;
- finfo.root_byte_off = round_up(finfo.ut_byte_off + finfo.ut_byte_len,
- ui->cluster_size);
+ clu_len = round_up(finfo.ut_byte_len, ui->cluster_size);
+
+ finfo.root_start_clu = finfo.ut_start_clu + clu_len / ui->cluster_size;
+ finfo.root_byte_off = finfo.ut_byte_off + clu_len;
finfo.root_byte_len = sizeof(struct exfat_dentry) * 3;
+ finfo.volume_serial = get_new_serial();
return 0;
}
return 0;
}
-static long long parse_cluster_size(const char *size)
+static long long parse_size(const char *size)
{
char *data_unit;
unsigned long long byte_size = strtoull(size, &data_unit, 0);
case 'k':
byte_size <<= 10;
break;
+ case '\0':
+ break;
default:
- exfat_err("Wrong unit input('%c') for cluster size\n",
+ exfat_err("Wrong unit input('%c') for size\n",
*data_unit);
return -EINVAL;
}
exfat_err("failed to init locale/codeset\n");
opterr = 0;
- while ((c = getopt_long(argc, argv, "n:L:c:fVvh", opts, NULL)) != EOF)
+ while ((c = getopt_long(argc, argv, "n:L:c:b:fVvh", opts, NULL)) != EOF)
switch (c) {
/*
* Make 'n' option fallthrough to 'L' option for for backward
break;
}
case 'c':
- ret = parse_cluster_size(optarg);
+ ret = parse_size(optarg);
if (ret < 0)
goto out;
- else if (ret > EXFAT_MAX_CLUSTER_SIZE) {
+ else if (ret & (ret - 1)) {
+ exfat_err("cluster size(%d) is not a power of 2)\n",
+ ret);
+ goto out;
+ } else if (ret > EXFAT_MAX_CLUSTER_SIZE) {
exfat_err("cluster size(%d) exceeds max cluster size(%d)\n",
ui.cluster_size, EXFAT_MAX_CLUSTER_SIZE);
goto out;
}
ui.cluster_size = ret;
break;
+ case 'b':
+ ret = parse_size(optarg);
+ if (ret < 0)
+ goto out;
+ else if (ret & (ret - 1)) {
+ exfat_err("boundary align(%d) is not a power of 2)\n",
+ ret);
+ goto out;
+ }
+ ui.boundary_align = ret;
+ break;
+ case PACK_BITMAP:
+ ui.pack_bitmap = true;
+ break;
case 'f':
ui.quick = false;
break;
ret = exfat_build_mkfs_info(&bd, &ui);
if (ret)
- goto out;
+ goto close;
ret = exfat_zero_out_disk(&bd, &ui);
if (ret)
- goto out;
+ goto close;
ret = make_exfat(&bd, &ui);
if (ret)
- goto out;
+ goto close;
exfat_info("Synchronizing...\n");
ret = fsync(bd.dev_fd);
+close:
+ close(bd.dev_fd);
out:
if (!ret)
exfat_info("\nexFAT format complete!\n");
else
exfat_info("\nexFAT format fail!\n");
- close(bd.dev_fd);
return ret;
}
projects / sven / exfatprogs.git / blobdiff