summaryrefslogtreecommitdiff
path: root/src/mkdosfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mkdosfs.c')
-rw-r--r--src/mkdosfs.c1734
1 files changed, 1734 insertions, 0 deletions
diff --git a/src/mkdosfs.c b/src/mkdosfs.c
new file mode 100644
index 0000000..d7c94f5
--- /dev/null
+++ b/src/mkdosfs.c
@@ -0,0 +1,1734 @@
+/* mkdosfs.c - utility to create FAT/MS-DOS filesystems
+
+ Copyright (C) 1991 Linus Torvalds <torvalds@klaava.helsinki.fi>
+ Copyright (C) 1992-1993 Remy Card <card@masi.ibp.fr>
+ Copyright (C) 1993-1994 David Hudson <dave@humbug.demon.co.uk>
+ Copyright (C) 1998 H. Peter Anvin <hpa@zytor.com>
+ Copyright (C) 1998-2005 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
+ Copyright (C) 2008-2013 Daniel Baumann <mail@daniel-baumann.ch>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ On Debian systems, the complete text of the GNU General Public License
+ can be found in /usr/share/common-licenses/GPL-3 file.
+*/
+
+/* Description: Utility to allow an MS-DOS filesystem to be created
+ under Linux. A lot of the basic structure of this program has been
+ borrowed from Remy Card's "mke2fs" code.
+
+ As far as possible the aim here is to make the "mkdosfs" command
+ look almost identical to the other Linux filesystem make utilties,
+ eg bad blocks are still specified as blocks, not sectors, but when
+ it comes down to it, DOS is tied to the idea of a sector (512 bytes
+ as a rule), and not the block. For example the boot block does not
+ occupy a full cluster.
+
+ Fixes/additions May 1998 by Roman Hodek
+ <Roman.Hodek@informatik.uni-erlangen.de>:
+ - Atari format support
+ - New options -A, -S, -C
+ - Support for filesystems > 2GB
+ - FAT32 support */
+
+/* Include the header files */
+
+#include "version.h"
+
+#include <fcntl.h>
+#include <linux/hdreg.h>
+#include <sys/mount.h>
+#include <linux/fd.h>
+#include <endian.h>
+#include <mntent.h>
+#include <signal.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include <asm/types.h>
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+
+#include <asm/byteorder.h>
+#ifdef __le16_to_cpu
+/* ++roman: 2.1 kernel headers define these function, they're probably more
+ * efficient then coding the swaps machine-independently. */
+#define CF_LE_W __le16_to_cpu
+#define CF_LE_L __le32_to_cpu
+#define CT_LE_W __cpu_to_le16
+#define CT_LE_L __cpu_to_le32
+#else
+#define CF_LE_W(v) ((((v) & 0xff) << 8) | (((v) >> 8) & 0xff))
+#define CF_LE_L(v) (((unsigned)(v)>>24) | (((unsigned)(v)>>8)&0xff00) | \
+ (((unsigned)(v)<<8)&0xff0000) | ((unsigned)(v)<<24))
+#define CT_LE_W(v) CF_LE_W(v)
+#define CT_LE_L(v) CF_LE_L(v)
+#endif /* defined(__le16_to_cpu) */
+
+#else
+
+#define CF_LE_W(v) (v)
+#define CF_LE_L(v) (v)
+#define CT_LE_W(v) (v)
+#define CT_LE_L(v) (v)
+
+#endif /* __BIG_ENDIAN */
+
+/* In earlier versions, an own llseek() was used, but glibc lseek() is
+ * sufficient (or even better :) for 64 bit offsets in the meantime */
+#define llseek lseek
+
+/* Constant definitions */
+
+#define TRUE 1 /* Boolean constants */
+#define FALSE 0
+
+#define TEST_BUFFER_BLOCKS 16
+#define HARD_SECTOR_SIZE 512
+#define SECTORS_PER_BLOCK ( BLOCK_SIZE / HARD_SECTOR_SIZE )
+
+#define NO_NAME "NO NAME "
+
+/* Macro definitions */
+
+/* Report a failure message and return a failure error code */
+
+#define die( str ) fatal_error( "%s: " str "\n" )
+
+/* Mark a cluster in the FAT as bad */
+
+#define mark_sector_bad( sector ) mark_FAT_sector( sector, FAT_BAD )
+
+/* Compute ceil(a/b) */
+
+inline int cdiv(int a, int b)
+{
+ return (a + b - 1) / b;
+}
+
+/* MS-DOS filesystem structures -- I included them here instead of
+ including linux/msdos_fs.h since that doesn't include some fields we
+ need */
+
+#define ATTR_RO 1 /* read-only */
+#define ATTR_HIDDEN 2 /* hidden */
+#define ATTR_SYS 4 /* system */
+#define ATTR_VOLUME 8 /* volume label */
+#define ATTR_DIR 16 /* directory */
+#define ATTR_ARCH 32 /* archived */
+
+#define ATTR_NONE 0 /* no attribute bits */
+#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
+ /* attribute bits that are copied "as is" */
+
+/* FAT values */
+#define FAT_EOF (atari_format ? 0x0fffffff : 0x0ffffff8)
+#define FAT_BAD 0x0ffffff7
+
+#define MSDOS_EXT_SIGN 0x29 /* extended boot sector signature */
+#define MSDOS_FAT12_SIGN "FAT12 " /* FAT12 filesystem signature */
+#define MSDOS_FAT16_SIGN "FAT16 " /* FAT16 filesystem signature */
+#define MSDOS_FAT32_SIGN "FAT32 " /* FAT32 filesystem signature */
+
+#define BOOT_SIGN 0xAA55 /* Boot sector magic number */
+
+#define MAX_CLUST_12 ((1 << 12) - 16)
+#define MAX_CLUST_16 ((1 << 16) - 16)
+#define MIN_CLUST_32 65529
+/* M$ says the high 4 bits of a FAT32 FAT entry are reserved and don't belong
+ * to the cluster number. So the max. cluster# is based on 2^28 */
+#define MAX_CLUST_32 ((1 << 28) - 16)
+
+#define FAT12_THRESHOLD 4085
+
+#define OLDGEMDOS_MAX_SECTORS 32765
+#define GEMDOS_MAX_SECTORS 65531
+#define GEMDOS_MAX_SECTOR_SIZE (16*1024)
+
+#define BOOTCODE_SIZE 448
+#define BOOTCODE_FAT32_SIZE 420
+
+/* __attribute__ ((packed)) is used on all structures to make gcc ignore any
+ * alignments */
+
+struct msdos_volume_info {
+ __u8 drive_number; /* BIOS drive number */
+ __u8 RESERVED; /* Unused */
+ __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
+ __u8 volume_id[4]; /* Volume ID number */
+ __u8 volume_label[11]; /* Volume label */
+ __u8 fs_type[8]; /* Typically FAT12 or FAT16 */
+} __attribute__ ((packed));
+
+struct msdos_boot_sector {
+ __u8 boot_jump[3]; /* Boot strap short or near jump */
+ __u8 system_id[8]; /* Name - can be used to special case
+ partition manager volumes */
+ __u8 sector_size[2]; /* bytes per logical sector */
+ __u8 cluster_size; /* sectors/cluster */
+ __u16 reserved; /* reserved sectors */
+ __u8 fats; /* number of FATs */
+ __u8 dir_entries[2]; /* root directory entries */
+ __u8 sectors[2]; /* number of sectors */
+ __u8 media; /* media code (unused) */
+ __u16 fat_length; /* sectors/FAT */
+ __u16 secs_track; /* sectors per track */
+ __u16 heads; /* number of heads */
+ __u32 hidden; /* hidden sectors (unused) */
+ __u32 total_sect; /* number of sectors (if sectors == 0) */
+ union {
+ struct {
+ struct msdos_volume_info vi;
+ __u8 boot_code[BOOTCODE_SIZE];
+ } __attribute__ ((packed)) _oldfat;
+ struct {
+ __u32 fat32_length; /* sectors/FAT */
+ __u16 flags; /* bit 8: fat mirroring, low 4: active fat */
+ __u8 version[2]; /* major, minor filesystem version */
+ __u32 root_cluster; /* first cluster in root directory */
+ __u16 info_sector; /* filesystem info sector */
+ __u16 backup_boot; /* backup boot sector */
+ __u16 reserved2[6]; /* Unused */
+ struct msdos_volume_info vi;
+ __u8 boot_code[BOOTCODE_FAT32_SIZE];
+ } __attribute__ ((packed)) _fat32;
+ } __attribute__ ((packed)) fstype;
+ __u16 boot_sign;
+} __attribute__ ((packed));
+#define fat32 fstype._fat32
+#define oldfat fstype._oldfat
+
+struct fat32_fsinfo {
+ __u32 reserved1; /* Nothing as far as I can tell */
+ __u32 signature; /* 0x61417272L */
+ __u32 free_clusters; /* Free cluster count. -1 if unknown */
+ __u32 next_cluster; /* Most recently allocated cluster.
+ * Unused under Linux. */
+ __u32 reserved2[4];
+};
+
+struct msdos_dir_entry {
+ char name[8], ext[3]; /* name and extension */
+ __u8 attr; /* attribute bits */
+ __u8 lcase; /* Case for base and extension */
+ __u8 ctime_ms; /* Creation time, milliseconds */
+ __u16 ctime; /* Creation time */
+ __u16 cdate; /* Creation date */
+ __u16 adate; /* Last access date */
+ __u16 starthi; /* high 16 bits of first cl. (FAT32) */
+ __u16 time, date, start; /* time, date and first cluster */
+ __u32 size; /* file size (in bytes) */
+} __attribute__ ((packed));
+
+/* The "boot code" we put into the filesystem... it writes a message and
+ tells the user to try again */
+
+char dummy_boot_jump[3] = { 0xeb, 0x3c, 0x90 };
+
+char dummy_boot_jump_m68k[2] = { 0x60, 0x1c };
+
+#define MSG_OFFSET_OFFSET 3
+char dummy_boot_code[BOOTCODE_SIZE] = "\x0e" /* push cs */
+ "\x1f" /* pop ds */
+ "\xbe\x5b\x7c" /* mov si, offset message_txt */
+ /* write_msg: */
+ "\xac" /* lodsb */
+ "\x22\xc0" /* and al, al */
+ "\x74\x0b" /* jz key_press */
+ "\x56" /* push si */
+ "\xb4\x0e" /* mov ah, 0eh */
+ "\xbb\x07\x00" /* mov bx, 0007h */
+ "\xcd\x10" /* int 10h */
+ "\x5e" /* pop si */
+ "\xeb\xf0" /* jmp write_msg */
+ /* key_press: */
+ "\x32\xe4" /* xor ah, ah */
+ "\xcd\x16" /* int 16h */
+ "\xcd\x19" /* int 19h */
+ "\xeb\xfe" /* foo: jmp foo */
+ /* message_txt: */
+ "This is not a bootable disk. Please insert a bootable floppy and\r\n"
+ "press any key to try again ... \r\n";
+
+#define MESSAGE_OFFSET 29 /* Offset of message in above code */
+
+/* Global variables - the root of all evil :-) - see these and weep! */
+
+static char *program_name = "mkdosfs"; /* Name of the program */
+static char *device_name = NULL; /* Name of the device on which to create the filesystem */
+static int atari_format = 0; /* Use Atari variation of MS-DOS FS format */
+static int check = FALSE; /* Default to no readablity checking */
+static int verbose = 0; /* Default to verbose mode off */
+static long volume_id; /* Volume ID number */
+static time_t create_time; /* Creation time */
+static struct timeval create_timeval; /* Creation time */
+static char volume_name[] = NO_NAME; /* Volume name */
+static unsigned long long blocks; /* Number of blocks in filesystem */
+static int sector_size = 512; /* Size of a logical sector */
+static int sector_size_set = 0; /* User selected sector size */
+static int backup_boot = 0; /* Sector# of backup boot sector */
+static int reserved_sectors = 0; /* Number of reserved sectors */
+static int badblocks = 0; /* Number of bad blocks in the filesystem */
+static int nr_fats = 2; /* Default number of FATs to produce */
+static int size_fat = 0; /* Size in bits of FAT entries */
+static int size_fat_by_user = 0; /* 1 if FAT size user selected */
+static int dev = -1; /* FS block device file handle */
+static int ignore_full_disk = 0; /* Ignore warning about 'full' disk devices */
+static off_t currently_testing = 0; /* Block currently being tested (if autodetect bad blocks) */
+static struct msdos_boot_sector bs; /* Boot sector data */
+static int start_data_sector; /* Sector number for the start of the data area */
+static int start_data_block; /* Block number for the start of the data area */
+static unsigned char *fat; /* File allocation table */
+static unsigned alloced_fat_length; /* # of FAT sectors we can keep in memory */
+static unsigned char *info_sector; /* FAT32 info sector */
+static struct msdos_dir_entry *root_dir; /* Root directory */
+static int size_root_dir; /* Size of the root directory in bytes */
+static int sectors_per_cluster = 0; /* Number of sectors per disk cluster */
+static int root_dir_entries = 0; /* Number of root directory entries */
+static char *blank_sector; /* Blank sector - all zeros */
+static int hidden_sectors = 0; /* Number of hidden sectors */
+static int malloc_entire_fat = FALSE; /* Whether we should malloc() the entire FAT or not */
+static int align_structures = TRUE; /* Whether to enforce alignment */
+static int orphaned_sectors = 0; /* Sectors that exist in the last block of filesystem */
+
+/* Function prototype definitions */
+
+static void fatal_error(const char *fmt_string) __attribute__ ((noreturn));
+static void mark_FAT_cluster(int cluster, unsigned int value);
+static void mark_FAT_sector(int sector, unsigned int value);
+static long do_check(char *buffer, int try, off_t current_block);
+static void alarm_intr(int alnum);
+static void check_blocks(void);
+static void get_list_blocks(char *filename);
+static int valid_offset(int fd, loff_t offset);
+static unsigned long long count_blocks(char *filename, int *remainder);
+static void check_mount(char *device_name);
+static void establish_params(int device_num, int size);
+static void setup_tables(void);
+static void write_tables(void);
+
+/* The function implementations */
+
+/* Handle the reporting of fatal errors. Volatile to let gcc know that this doesn't return */
+
+static void fatal_error(const char *fmt_string)
+{
+ fprintf(stderr, fmt_string, program_name, device_name);
+ exit(1); /* The error exit code is 1! */
+}
+
+/* Mark the specified cluster as having a particular value */
+
+static void mark_FAT_cluster(int cluster, unsigned int value)
+{
+ switch (size_fat) {
+ case 12:
+ value &= 0x0fff;
+ if (((cluster * 3) & 0x1) == 0) {
+ fat[3 * cluster / 2] = (unsigned char)(value & 0x00ff);
+ fat[(3 * cluster / 2) + 1] =
+ (unsigned char)((fat[(3 * cluster / 2) + 1] & 0x00f0)
+ | ((value & 0x0f00) >> 8));
+ } else {
+ fat[3 * cluster / 2] =
+ (unsigned char)((fat[3 * cluster / 2] & 0x000f) |
+ ((value & 0x000f) << 4));
+ fat[(3 * cluster / 2) + 1] = (unsigned char)((value & 0x0ff0) >> 4);
+ }
+ break;
+
+ case 16:
+ value &= 0xffff;
+ fat[2 * cluster] = (unsigned char)(value & 0x00ff);
+ fat[(2 * cluster) + 1] = (unsigned char)(value >> 8);
+ break;
+
+ case 32:
+ value &= 0xfffffff;
+ fat[4 * cluster] = (unsigned char)(value & 0x000000ff);
+ fat[(4 * cluster) + 1] = (unsigned char)((value & 0x0000ff00) >> 8);
+ fat[(4 * cluster) + 2] = (unsigned char)((value & 0x00ff0000) >> 16);
+ fat[(4 * cluster) + 3] = (unsigned char)((value & 0xff000000) >> 24);
+ break;
+
+ default:
+ die("Bad FAT size (not 12, 16, or 32)");
+ }
+}
+
+/* Mark a specified sector as having a particular value in it's FAT entry */
+
+static void mark_FAT_sector(int sector, unsigned int value)
+{
+ int cluster;
+
+ cluster = (sector - start_data_sector) / (int)(bs.cluster_size) /
+ (sector_size / HARD_SECTOR_SIZE);
+ if (cluster < 0)
+ die("Invalid cluster number in mark_FAT_sector: probably bug!");
+
+ mark_FAT_cluster(cluster, value);
+}
+
+/* Perform a test on a block. Return the number of blocks that could be read successfully */
+
+static long do_check(char *buffer, int try, off_t current_block)
+{
+ long got;
+
+ if (llseek(dev, current_block * BLOCK_SIZE, SEEK_SET) /* Seek to the correct location */
+ !=current_block * BLOCK_SIZE)
+ die("seek failed during testing for blocks");
+
+ got = read(dev, buffer, try * BLOCK_SIZE); /* Try reading! */
+ if (got < 0)
+ got = 0;
+
+ if (got & (BLOCK_SIZE - 1))
+ printf("Unexpected values in do_check: probably bugs\n");
+ got /= BLOCK_SIZE;
+
+ return got;
+}
+
+/* Alarm clock handler - display the status of the quest for bad blocks! Then retrigger the alarm for five senconds
+ later (so we can come here again) */
+
+static void alarm_intr(int alnum)
+{
+ if (currently_testing >= blocks)
+ return;
+
+ signal(SIGALRM, alarm_intr);
+ alarm(5);
+ if (!currently_testing)
+ return;
+
+ printf("%lld... ", (unsigned long long)currently_testing);
+ fflush(stdout);
+}
+
+static void check_blocks(void)
+{
+ int try, got;
+ int i;
+ static char blkbuf[BLOCK_SIZE * TEST_BUFFER_BLOCKS];
+
+ if (verbose) {
+ printf("Searching for bad blocks ");
+ fflush(stdout);
+ }
+ currently_testing = 0;
+ if (verbose) {
+ signal(SIGALRM, alarm_intr);
+ alarm(5);
+ }
+ try = TEST_BUFFER_BLOCKS;
+ while (currently_testing < blocks) {
+ if (currently_testing + try > blocks)
+ try = blocks - currently_testing;
+ got = do_check(blkbuf, try, currently_testing);
+ currently_testing += got;
+ if (got == try) {
+ try = TEST_BUFFER_BLOCKS;
+ continue;
+ } else
+ try = 1;
+ if (currently_testing < start_data_block)
+ die("bad blocks before data-area: cannot make fs");
+
+ for (i = 0; i < SECTORS_PER_BLOCK; i++) /* Mark all of the sectors in the block as bad */
+ mark_sector_bad(currently_testing * SECTORS_PER_BLOCK + i);
+ badblocks++;
+ currently_testing++;
+ }
+
+ if (verbose)
+ printf("\n");
+
+ if (badblocks)
+ printf("%d bad block%s\n", badblocks, (badblocks > 1) ? "s" : "");
+}
+
+static void get_list_blocks(char *filename)
+{
+ int i;
+ FILE *listfile;
+ unsigned long blockno;
+
+ listfile = fopen(filename, "r");
+ if (listfile == (FILE *) NULL)
+ die("Can't open file of bad blocks");
+
+ while (!feof(listfile)) {
+ fscanf(listfile, "%ld\n", &blockno);
+ for (i = 0; i < SECTORS_PER_BLOCK; i++) /* Mark all of the sectors in the block as bad */
+ mark_sector_bad(blockno * SECTORS_PER_BLOCK + i);
+ badblocks++;
+ }
+ fclose(listfile);
+
+ if (badblocks)
+ printf("%d bad block%s\n", badblocks, (badblocks > 1) ? "s" : "");
+}
+
+/* Given a file descriptor and an offset, check whether the offset is a valid offset for the file - return FALSE if it
+ isn't valid or TRUE if it is */
+
+static int valid_offset(int fd, loff_t offset)
+{
+ char ch;
+
+ if (llseek(fd, offset, SEEK_SET) < 0)
+ return FALSE;
+ if (read(fd, &ch, 1) < 1)
+ return FALSE;
+ return TRUE;
+}
+
+/* Given a filename, look to see how many blocks of BLOCK_SIZE are present, returning the answer */
+
+static unsigned long long count_blocks(char *filename, int *remainder)
+
+{
+ loff_t high, low;
+ int fd;
+
+ if ((fd = open(filename, O_RDONLY)) < 0) {
+ perror(filename);
+ exit(1);
+ }
+
+ /* first try SEEK_END, which should work on most devices nowadays */
+ if ((low = llseek(fd, 0, SEEK_END)) <= 0) {
+ low = 0;
+ for (high = 1; valid_offset(fd, high); high *= 2)
+ low = high;
+ while (low < high - 1) {
+ const loff_t mid = (low + high) / 2;
+ if (valid_offset(fd, mid))
+ low = mid;
+ else
+ high = mid;
+ }
+ ++low;
+ }
+
+ close(fd);
+ *remainder = (low%BLOCK_SIZE)/sector_size;
+ return(low / BLOCK_SIZE);
+}
+
+/* Check to see if the specified device is currently mounted - abort if it is */
+
+static void check_mount(char *device_name)
+{
+ FILE *f;
+ struct mntent *mnt;
+
+ if ((f = setmntent(MOUNTED, "r")) == NULL)
+ return;
+ while ((mnt = getmntent(f)) != NULL)
+ if (strcmp(device_name, mnt->mnt_fsname) == 0)
+ die("%s contains a mounted file system.");
+ endmntent(f);
+}
+
+/* Establish the geometry and media parameters for the device */
+
+static void establish_params(int device_num, int size)
+{
+ long loop_size;
+ struct hd_geometry geometry;
+ struct floppy_struct param;
+ int def_root_dir_entries = 512;
+
+ if ((0 == device_num) || ((device_num & 0xff00) == 0x0200))
+ /* file image or floppy disk */
+ {
+ if (0 == device_num) {
+ param.size = size / 512;
+ switch (param.size) {
+ case 720:
+ param.sect = 9;
+ param.head = 2;
+ break;
+ case 1440:
+ param.sect = 9;
+ param.head = 2;
+ break;
+ case 2400:
+ param.sect = 15;
+ param.head = 2;
+ break;
+ case 2880:
+ param.sect = 18;
+ param.head = 2;
+ break;
+ case 5760:
+ param.sect = 36;
+ param.head = 2;
+ break;
+ default:
+ /* fake values */
+ param.sect = 32;
+ param.head = 64;
+ break;
+ }
+
+ } else { /* is a floppy diskette */
+
+ if (ioctl(dev, FDGETPRM, &param)) /* Can we get the diskette geometry? */
+ die("unable to get diskette geometry for '%s'");
+ }
+ bs.secs_track = CT_LE_W(param.sect); /* Set up the geometry information */
+ bs.heads = CT_LE_W(param.head);
+ switch (param.size) { /* Set up the media descriptor byte */
+ case 720: /* 5.25", 2, 9, 40 - 360K */
+ bs.media = (char)0xfd;
+ bs.cluster_size = (char)2;
+ def_root_dir_entries = 112;
+ break;
+
+ case 1440: /* 3.5", 2, 9, 80 - 720K */
+ bs.media = (char)0xf9;
+ bs.cluster_size = (char)2;
+ def_root_dir_entries = 112;
+ break;
+
+ case 2400: /* 5.25", 2, 15, 80 - 1200K */
+ bs.media = (char)0xf9;
+ bs.cluster_size = (char)(atari_format ? 2 : 1);
+ def_root_dir_entries = 224;
+ break;
+
+ case 5760: /* 3.5", 2, 36, 80 - 2880K */
+ bs.media = (char)0xf0;
+ bs.cluster_size = (char)2;
+ def_root_dir_entries = 224;
+ break;
+
+ case 2880: /* 3.5", 2, 18, 80 - 1440K */
+floppy_default:
+ bs.media = (char)0xf0;
+ bs.cluster_size = (char)(atari_format ? 2 : 1);
+ def_root_dir_entries = 224;
+ break;
+
+ default: /* Anything else */
+ if (0 == device_num)
+ goto def_hd_params;
+ else
+ goto floppy_default;
+ }
+ } else if ((device_num & 0xff00) == 0x0700) { /* This is a loop device */
+ if (ioctl(dev, BLKGETSIZE, &loop_size))
+ die("unable to get loop device size");
+
+ switch (loop_size) { /* Assuming the loop device -> floppy later */
+ case 720: /* 5.25", 2, 9, 40 - 360K */
+ bs.secs_track = CF_LE_W(9);
+ bs.heads = CF_LE_W(2);
+ bs.media = (char)0xfd;
+ bs.cluster_size = (char)2;
+ def_root_dir_entries = 112;
+ break;
+
+ case 1440: /* 3.5", 2, 9, 80 - 720K */
+ bs.secs_track = CF_LE_W(9);
+ bs.heads = CF_LE_W(2);
+ bs.media = (char)0xf9;
+ bs.cluster_size = (char)2;
+ def_root_dir_entries = 112;
+ break;
+
+ case 2400: /* 5.25", 2, 15, 80 - 1200K */
+ bs.secs_track = CF_LE_W(15);
+ bs.heads = CF_LE_W(2);
+ bs.media = (char)0xf9;
+ bs.cluster_size = (char)(atari_format ? 2 : 1);
+ def_root_dir_entries = 224;
+ break;
+
+ case 5760: /* 3.5", 2, 36, 80 - 2880K */
+ bs.secs_track = CF_LE_W(36);
+ bs.heads = CF_LE_W(2);
+ bs.media = (char)0xf0;
+ bs.cluster_size = (char)2;
+ bs.dir_entries[0] = (char)224;
+ bs.dir_entries[1] = (char)0;
+ break;
+
+ case 2880: /* 3.5", 2, 18, 80 - 1440K */
+ bs.secs_track = CF_LE_W(18);
+ bs.heads = CF_LE_W(2);
+ bs.media = (char)0xf0;
+ bs.cluster_size = (char)(atari_format ? 2 : 1);
+ def_root_dir_entries = 224;
+ break;
+
+ default: /* Anything else: default hd setup */
+ printf("Loop device does not match a floppy size, using "
+ "default hd params\n");
+ bs.secs_track = CT_LE_W(32); /* these are fake values... */
+ bs.heads = CT_LE_W(64);
+ goto def_hd_params;
+ }
+ } else
+ /* Must be a hard disk then! */
+ {
+ /* Can we get the drive geometry? (Note I'm not too sure about */
+ /* whether to use HDIO_GETGEO or HDIO_REQ) */
+ if (ioctl(dev, HDIO_GETGEO, &geometry) || geometry.sectors == 0
+ || geometry.heads == 0) {
+ printf("unable to get drive geometry, using default 255/63\n");
+ bs.secs_track = CT_LE_W(63);
+ bs.heads = CT_LE_W(255);
+ } else {
+ bs.secs_track = CT_LE_W(geometry.sectors); /* Set up the geometry information */
+ bs.heads = CT_LE_W(geometry.heads);
+ }
+def_hd_params:
+ bs.media = (char)0xf8; /* Set up the media descriptor for a hard drive */
+ if (!size_fat && blocks * SECTORS_PER_BLOCK > 1064960) {
+ if (verbose)
+ printf("Auto-selecting FAT32 for large filesystem\n");
+ size_fat = 32;
+ }
+ if (size_fat == 32) {
+ /* For FAT32, try to do the same as M$'s format command
+ * (see http://www.win.tue.nl/~aeb/linux/fs/fat/fatgen103.pdf p. 20):
+ * fs size <= 260M: 0.5k clusters
+ * fs size <= 8G: 4k clusters
+ * fs size <= 16G: 8k clusters
+ * fs size > 16G: 16k clusters
+ */
+ unsigned long sz_mb =
+ (blocks + (1 << (20 - BLOCK_SIZE_BITS)) - 1) >> (20 -
+ BLOCK_SIZE_BITS);
+ bs.cluster_size =
+ sz_mb > 16 * 1024 ? 32 : sz_mb > 8 * 1024 ? 16 : sz_mb >
+ 260 ? 8 : 1;
+ } else {
+ /* FAT12 and FAT16: start at 4 sectors per cluster */
+ bs.cluster_size = (char)4;
+ }
+ }
+
+ if (!root_dir_entries)
+ root_dir_entries = def_root_dir_entries;
+}
+
+/*
+ * If alignment is enabled, round the first argument up to the second; the
+ * latter must be a power of two.
+ */
+static unsigned int align_object(unsigned int sectors, unsigned int clustsize)
+{
+ if (align_structures)
+ return (sectors + clustsize - 1) & ~(clustsize - 1);
+ else
+ return sectors;
+}
+
+/* Create the filesystem data tables */
+
+static void setup_tables(void)
+{
+ unsigned num_sectors;
+ unsigned cluster_count = 0, fat_length;
+ struct tm *ctime;
+ struct msdos_volume_info *vi =
+ (size_fat == 32 ? &bs.fat32.vi : &bs.oldfat.vi);
+
+ if (atari_format)
+ /* On Atari, the first few bytes of the boot sector are assigned
+ * differently: The jump code is only 2 bytes (and m68k machine code
+ * :-), then 6 bytes filler (ignored), then 3 byte serial number. */
+ memcpy(bs.system_id - 1, "mkdosf", 6);
+ else
+ strcpy((char *)bs.system_id, "mkdosfs");
+ if (sectors_per_cluster)
+ bs.cluster_size = (char)sectors_per_cluster;
+ if (size_fat == 32) {
+ /* Under FAT32, the root dir is in a cluster chain, and this is
+ * signalled by bs.dir_entries being 0. */
+ root_dir_entries = 0;
+ }
+
+ if (atari_format) {
+ bs.system_id[5] = (unsigned char)(volume_id & 0x000000ff);
+ bs.system_id[6] = (unsigned char)((volume_id & 0x0000ff00) >> 8);
+ bs.system_id[7] = (unsigned char)((volume_id & 0x00ff0000) >> 16);
+ } else {
+ vi->volume_id[0] = (unsigned char)(volume_id & 0x000000ff);
+ vi->volume_id[1] = (unsigned char)((volume_id & 0x0000ff00) >> 8);
+ vi->volume_id[2] = (unsigned char)((volume_id & 0x00ff0000) >> 16);
+ vi->volume_id[3] = (unsigned char)(volume_id >> 24);
+ }
+
+ if (!atari_format) {
+ memcpy(vi->volume_label, volume_name, 11);
+
+ memcpy(bs.boot_jump, dummy_boot_jump, 3);
+ /* Patch in the correct offset to the boot code */
+ bs.boot_jump[1] = ((size_fat == 32 ?
+ (char *)&bs.fat32.boot_code :
+ (char *)&bs.oldfat.boot_code) - (char *)&bs) - 2;
+
+ if (size_fat == 32) {
+ int offset = (char *)&bs.fat32.boot_code -
+ (char *)&bs + MESSAGE_OFFSET + 0x7c00;
+ if (dummy_boot_code[BOOTCODE_FAT32_SIZE - 1])
+ printf("Warning: message too long; truncated\n");
+ dummy_boot_code[BOOTCODE_FAT32_SIZE - 1] = 0;
+ memcpy(bs.fat32.boot_code, dummy_boot_code, BOOTCODE_FAT32_SIZE);
+ bs.fat32.boot_code[MSG_OFFSET_OFFSET] = offset & 0xff;
+ bs.fat32.boot_code[MSG_OFFSET_OFFSET + 1] = offset >> 8;
+ } else {
+ memcpy(bs.oldfat.boot_code, dummy_boot_code, BOOTCODE_SIZE);
+ }
+ bs.boot_sign = CT_LE_W(BOOT_SIGN);
+ } else {
+ memcpy(bs.boot_jump, dummy_boot_jump_m68k, 2);
+ }
+ if (verbose >= 2)
+ printf("Boot jump code is %02x %02x\n",
+ bs.boot_jump[0], bs.boot_jump[1]);
+
+ if (!reserved_sectors)
+ reserved_sectors = (size_fat == 32) ? 32 : 1;
+ else {
+ if (size_fat == 32 && reserved_sectors < 2)
+ die("On FAT32 at least 2 reserved sectors are needed.");
+ }
+ bs.reserved = CT_LE_W(reserved_sectors);
+ if (verbose >= 2)
+ printf("Using %d reserved sectors\n", reserved_sectors);
+ bs.fats = (char)nr_fats;
+ if (!atari_format || size_fat == 32)
+ bs.hidden = CT_LE_L(hidden_sectors);
+ else {
+ /* In Atari format, hidden is a 16 bit field */
+ __u16 hidden = CT_LE_W(hidden_sectors);
+ if (hidden_sectors & ~0xffff)
+ die("#hidden doesn't fit in 16bit field of Atari format\n");
+ memcpy(&bs.hidden, &hidden, 2);
+ }
+
+ num_sectors = (long long)(blocks *BLOCK_SIZE / sector_size)+orphaned_sectors;
+
+ if (!atari_format) {
+ unsigned fatdata1216; /* Sectors for FATs + data area (FAT12/16) */
+ unsigned fatdata32; /* Sectors for FATs + data area (FAT32) */
+ unsigned fatlength12, fatlength16, fatlength32;
+ unsigned maxclust12, maxclust16, maxclust32;
+ unsigned clust12, clust16, clust32;
+ int maxclustsize;
+ unsigned root_dir_sectors = cdiv(root_dir_entries * 32, sector_size);
+
+ /*
+ * If the filesystem is 8192 sectors or less (4 MB with 512-byte
+ * sectors, i.e. floppy size), don't align the data structures.
+ */
+ if (num_sectors <= 8192) {
+ if (align_structures && verbose >= 2)
+ printf("Disabling alignment due to tiny filesystem\n");
+
+ align_structures = FALSE;
+ }
+
+ if (sectors_per_cluster)
+ bs.cluster_size = maxclustsize = sectors_per_cluster;
+ else
+ /* An initial guess for bs.cluster_size should already be set */
+ maxclustsize = 128;
+
+ do {
+ fatdata32 = num_sectors
+ - align_object(reserved_sectors, bs.cluster_size);
+ fatdata1216 = fatdata32
+ - align_object(root_dir_sectors, bs.cluster_size);
+
+ if (verbose >= 2)
+ printf("Trying with %d sectors/cluster:\n", bs.cluster_size);
+
+ /* The factor 2 below avoids cut-off errors for nr_fats == 1.
+ * The "nr_fats*3" is for the reserved first two FAT entries */
+ clust12 = 2 * ((long long)fatdata1216 * sector_size + nr_fats * 3) /
+ (2 * (int)bs.cluster_size * sector_size + nr_fats * 3);
+ fatlength12 = cdiv(((clust12 + 2) * 3 + 1) >> 1, sector_size);
+ fatlength12 = align_object(fatlength12, bs.cluster_size);
+ /* Need to recalculate number of clusters, since the unused parts of the
+ * FATS and data area together could make up space for an additional,
+ * not really present cluster. */
+ clust12 = (fatdata1216 - nr_fats * fatlength12) / bs.cluster_size;
+ maxclust12 = (fatlength12 * 2 * sector_size) / 3;
+ if (maxclust12 > MAX_CLUST_12)
+ maxclust12 = MAX_CLUST_12;
+ if (verbose >= 2)
+ printf("FAT12: #clu=%u, fatlen=%u, maxclu=%u, limit=%u\n",
+ clust12, fatlength12, maxclust12, MAX_CLUST_12);
+ if (clust12 > maxclust12 - 2) {
+ clust12 = 0;
+ if (verbose >= 2)
+ printf("FAT12: too much clusters\n");
+ }
+
+ clust16 = ((long long)fatdata1216 * sector_size + nr_fats * 4) /
+ ((int)bs.cluster_size * sector_size + nr_fats * 2);
+ fatlength16 = cdiv((clust16 + 2) * 2, sector_size);
+ fatlength16 = align_object(fatlength16, bs.cluster_size);
+ /* Need to recalculate number of clusters, since the unused parts of the
+ * FATS and data area together could make up space for an additional,
+ * not really present cluster. */
+ clust16 = (fatdata1216 - nr_fats * fatlength16) / bs.cluster_size;
+ maxclust16 = (fatlength16 * sector_size) / 2;
+ if (maxclust16 > MAX_CLUST_16)
+ maxclust16 = MAX_CLUST_16;
+ if (verbose >= 2)
+ printf("FAT16: #clu=%u, fatlen=%u, maxclu=%u, limit=%u\n",
+ clust16, fatlength16, maxclust16, MAX_CLUST_16);
+ if (clust16 > maxclust16 - 2) {
+ if (verbose >= 2)
+ printf("FAT16: too much clusters\n");
+ clust16 = 0;
+ }
+ /* The < 4078 avoids that the filesystem will be misdetected as having a
+ * 12 bit FAT. */
+ if (clust16 < FAT12_THRESHOLD
+ && !(size_fat_by_user && size_fat == 16)) {
+ if (verbose >= 2)
+ printf(clust16 < FAT12_THRESHOLD ?
+ "FAT16: would be misdetected as FAT12\n" :
+ "FAT16: too much clusters\n");
+ clust16 = 0;
+ }
+
+ clust32 = ((long long)fatdata32 * sector_size + nr_fats * 8) /
+ ((int)bs.cluster_size * sector_size + nr_fats * 4);
+ fatlength32 = cdiv((clust32 + 2) * 4, sector_size);
+ fatlength32 = align_object(fatlength32, bs.cluster_size);
+ /* Need to recalculate number of clusters, since the unused parts of the
+ * FATS and data area together could make up space for an additional,
+ * not really present cluster. */
+ clust32 = (fatdata32 - nr_fats * fatlength32) / bs.cluster_size;
+ maxclust32 = (fatlength32 * sector_size) / 4;
+ if (maxclust32 > MAX_CLUST_32)
+ maxclust32 = MAX_CLUST_32;
+ if (clust32 && clust32 < MIN_CLUST_32
+ && !(size_fat_by_user && size_fat == 32)) {
+ clust32 = 0;
+ if (verbose >= 2)
+ printf("FAT32: not enough clusters (%d)\n", MIN_CLUST_32);
+ }
+ if (verbose >= 2)
+ printf("FAT32: #clu=%u, fatlen=%u, maxclu=%u, limit=%u\n",
+ clust32, fatlength32, maxclust32, MAX_CLUST_32);
+ if (clust32 > maxclust32) {
+ clust32 = 0;
+ if (verbose >= 2)
+ printf("FAT32: too much clusters\n");
+ }
+
+ if ((clust12 && (size_fat == 0 || size_fat == 12)) ||
+ (clust16 && (size_fat == 0 || size_fat == 16)) ||
+ (clust32 && size_fat == 32))
+ break;
+
+ bs.cluster_size <<= 1;
+ } while (bs.cluster_size && bs.cluster_size <= maxclustsize);
+
+ /* Use the optimal FAT size if not specified;
+ * FAT32 is (not yet) choosen automatically */
+ if (!size_fat) {
+ size_fat = (clust16 > clust12) ? 16 : 12;
+ if (verbose >= 2)
+ printf("Choosing %d bits for FAT\n", size_fat);
+ }
+
+ switch (size_fat) {
+ case 12:
+ cluster_count = clust12;
+ fat_length = fatlength12;
+ bs.fat_length = CT_LE_W(fatlength12);
+ memcpy(vi->fs_type, MSDOS_FAT12_SIGN, 8);
+ break;
+
+ case 16:
+ if (clust16 < FAT12_THRESHOLD) {
+ if (size_fat_by_user) {
+ fprintf(stderr, "WARNING: Not enough clusters for a "
+ "16 bit FAT! The filesystem will be\n"
+ "misinterpreted as having a 12 bit FAT without "
+ "mount option \"fat=16\".\n");
+ } else {
+ fprintf(stderr, "This filesystem has an unfortunate size. "
+ "A 12 bit FAT cannot provide\n"
+ "enough clusters, but a 16 bit FAT takes up a little "
+ "bit more space so that\n"
+ "the total number of clusters becomes less than the "
+ "threshold value for\n"
+ "distinction between 12 and 16 bit FATs.\n");
+ die("Make the file system a bit smaller manually.");
+ }
+ }
+ cluster_count = clust16;
+ fat_length = fatlength16;
+ bs.fat_length = CT_LE_W(fatlength16);
+ memcpy(vi->fs_type, MSDOS_FAT16_SIGN, 8);
+ break;
+
+ case 32:
+ if (clust32 < MIN_CLUST_32)
+ fprintf(stderr,
+ "WARNING: Not enough clusters for a 32 bit FAT!\n");
+ cluster_count = clust32;
+ fat_length = fatlength32;
+ bs.fat_length = CT_LE_W(0);
+ bs.fat32.fat32_length = CT_LE_L(fatlength32);
+ memcpy(vi->fs_type, MSDOS_FAT32_SIGN, 8);
+ root_dir_entries = 0;
+ break;
+
+ default:
+ die("FAT not 12, 16 or 32 bits");
+ }
+
+ /* Adjust the reserved number of sectors for alignment */
+ reserved_sectors = align_object(reserved_sectors, bs.cluster_size);
+ bs.reserved = CT_LE_W(reserved_sectors);
+
+ /* Adjust the number of root directory entries to help enforce alignment */
+ if (align_structures) {
+ root_dir_entries = align_object(root_dir_sectors, bs.cluster_size)
+ * (sector_size >> 5);
+ }
+ } else {
+ unsigned clusters, maxclust, fatdata;
+
+ /* GEMDOS always uses a 12 bit FAT on floppies, and always a 16 bit FAT on
+ * hard disks. So use 12 bit if the size of the file system suggests that
+ * this fs is for a floppy disk, if the user hasn't explicitly requested a
+ * size.
+ */
+ if (!size_fat)
+ size_fat = (num_sectors == 1440 || num_sectors == 2400 ||
+ num_sectors == 2880 || num_sectors == 5760) ? 12 : 16;
+ if (verbose >= 2)
+ printf("Choosing %d bits for FAT\n", size_fat);
+
+ /* Atari format: cluster size should be 2, except explicitly requested by
+ * the user, since GEMDOS doesn't like other cluster sizes very much.
+ * Instead, tune the sector size for the FS to fit.
+ */
+ bs.cluster_size = sectors_per_cluster ? sectors_per_cluster : 2;
+ if (!sector_size_set) {
+ while (num_sectors > GEMDOS_MAX_SECTORS) {
+ num_sectors >>= 1;
+ sector_size <<= 1;
+ }
+ }
+ if (verbose >= 2)
+ printf("Sector size must be %d to have less than %d log. sectors\n",
+ sector_size, GEMDOS_MAX_SECTORS);
+
+ /* Check if there are enough FAT indices for how much clusters we have */
+ do {
+ fatdata = num_sectors - cdiv(root_dir_entries * 32, sector_size) -
+ reserved_sectors;
+ /* The factor 2 below avoids cut-off errors for nr_fats == 1 and
+ * size_fat == 12
+ * The "2*nr_fats*size_fat/8" is for the reserved first two FAT entries
+ */
+ clusters =
+ (2 *
+ ((long long)fatdata * sector_size -
+ 2 * nr_fats * size_fat / 8)) / (2 * ((int)bs.cluster_size *
+ sector_size +
+ nr_fats * size_fat / 8));
+ fat_length = cdiv((clusters + 2) * size_fat / 8, sector_size);
+ /* Need to recalculate number of clusters, since the unused parts of the
+ * FATS and data area together could make up space for an additional,
+ * not really present cluster. */
+ clusters = (fatdata - nr_fats * fat_length) / bs.cluster_size;
+ maxclust = (fat_length * sector_size * 8) / size_fat;
+ if (verbose >= 2)
+ printf("ss=%d: #clu=%d, fat_len=%d, maxclu=%d\n",
+ sector_size, clusters, fat_length, maxclust);
+
+ /* last 10 cluster numbers are special (except FAT32: 4 high bits rsvd);
+ * first two numbers are reserved */
+ if (maxclust <=
+ (size_fat == 32 ? MAX_CLUST_32 : (1 << size_fat) - 0x10)
+ && clusters <= maxclust - 2)
+ break;
+ if (verbose >= 2)
+ printf(clusters > maxclust - 2 ?
+ "Too many clusters\n" : "FAT too big\n");
+
+ /* need to increment sector_size once more to */
+ if (sector_size_set)
+ die("With this sector size, the maximum number of FAT entries "
+ "would be exceeded.");
+ num_sectors >>= 1;
+ sector_size <<= 1;
+ } while (sector_size <= GEMDOS_MAX_SECTOR_SIZE);
+
+ if (sector_size > GEMDOS_MAX_SECTOR_SIZE)
+ die("Would need a sector size > 16k, which GEMDOS can't work with");
+
+ cluster_count = clusters;
+ if (size_fat != 32)
+ bs.fat_length = CT_LE_W(fat_length);
+ else {
+ bs.fat_length = 0;
+ bs.fat32.fat32_length = CT_LE_L(fat_length);
+ }
+ }
+
+ bs.sector_size[0] = (char)(sector_size & 0x00ff);
+ bs.sector_size[1] = (char)((sector_size & 0xff00) >> 8);
+
+ bs.dir_entries[0] = (char)(root_dir_entries & 0x00ff);
+ bs.dir_entries[1] = (char)((root_dir_entries & 0xff00) >> 8);
+
+ if (size_fat == 32) {
+ /* set up additional FAT32 fields */
+ bs.fat32.flags = CT_LE_W(0);
+ bs.fat32.version[0] = 0;
+ bs.fat32.version[1] = 0;
+ bs.fat32.root_cluster = CT_LE_L(2);
+ bs.fat32.info_sector = CT_LE_W(1);
+ if (!backup_boot)
+ backup_boot = (reserved_sectors >= 7) ? 6 :
+ (reserved_sectors >= 2) ? reserved_sectors - 1 : 0;
+ else {
+ if (backup_boot == 1)
+ die("Backup boot sector must be after sector 1");
+ else if (backup_boot >= reserved_sectors)
+ die("Backup boot sector must be a reserved sector");
+ }
+ if (verbose >= 2)
+ printf("Using sector %d as backup boot sector (0 = none)\n",
+ backup_boot);
+ bs.fat32.backup_boot = CT_LE_W(backup_boot);
+ memset(&bs.fat32.reserved2, 0, sizeof(bs.fat32.reserved2));
+ }
+
+ if (atari_format) {
+ /* Just some consistency checks */
+ if (num_sectors >= GEMDOS_MAX_SECTORS)
+ die("GEMDOS can't handle more than 65531 sectors");
+ else if (num_sectors >= OLDGEMDOS_MAX_SECTORS)
+ printf("Warning: More than 32765 sector need TOS 1.04 "
+ "or higher.\n");
+ }
+ if (num_sectors >= 65536) {
+ bs.sectors[0] = (char)0;
+ bs.sectors[1] = (char)0;
+ bs.total_sect = CT_LE_L(num_sectors);
+ } else {
+ bs.sectors[0] = (char)(num_sectors & 0x00ff);
+ bs.sectors[1] = (char)((num_sectors & 0xff00) >> 8);
+ if (!atari_format)
+ bs.total_sect = CT_LE_L(0);
+ }
+
+ if (!atari_format)
+ vi->ext_boot_sign = MSDOS_EXT_SIGN;
+
+ if (!cluster_count) {
+ if (sectors_per_cluster) /* If yes, die if we'd spec'd sectors per cluster */
+ die("Too many clusters for file system - try more sectors per cluster");
+ else
+ die("Attempting to create a too large file system");
+ }
+
+ /* The two following vars are in hard sectors, i.e. 512 byte sectors! */
+ start_data_sector = (reserved_sectors + nr_fats * fat_length) *
+ (sector_size / HARD_SECTOR_SIZE);
+ start_data_block = (start_data_sector + SECTORS_PER_BLOCK - 1) /
+ SECTORS_PER_BLOCK;
+
+ if (blocks < start_data_block + 32) /* Arbitrary undersize file system! */
+ die("Too few blocks for viable file system");
+
+ if (verbose) {
+ printf("%s has %d head%s and %d sector%s per track,\n",
+ device_name, CF_LE_W(bs.heads),
+ (CF_LE_W(bs.heads) != 1) ? "s" : "", CF_LE_W(bs.secs_track),
+ (CF_LE_W(bs.secs_track) != 1) ? "s" : "");
+ printf("logical sector size is %d,\n", sector_size);
+ printf("using 0x%02x media descriptor, with %d sectors;\n",
+ (int)(bs.media), num_sectors);
+ printf("file system has %d %d-bit FAT%s and %d sector%s per cluster.\n",
+ (int)(bs.fats), size_fat, (bs.fats != 1) ? "s" : "",
+ (int)(bs.cluster_size), (bs.cluster_size != 1) ? "s" : "");
+ printf("FAT size is %d sector%s, and provides %d cluster%s.\n",
+ fat_length, (fat_length != 1) ? "s" : "",
+ cluster_count, (cluster_count != 1) ? "s" : "");
+ printf("There %s %u reserved sector%s.\n",
+ (reserved_sectors != 1) ? "are" : "is",
+ reserved_sectors, (reserved_sectors != 1) ? "s" : "");
+
+ if (size_fat != 32) {
+ unsigned root_dir_entries =
+ bs.dir_entries[0] + ((bs.dir_entries[1]) * 256);
+ unsigned root_dir_sectors =
+ cdiv(root_dir_entries * 32, sector_size);
+ printf("Root directory contains %u slots and uses %u sectors.\n",
+ root_dir_entries, root_dir_sectors);
+ }
+ printf("Volume ID is %08lx, ", volume_id &
+ (atari_format ? 0x00ffffff : 0xffffffff));
+ if (strcmp(volume_name, NO_NAME))
+ printf("volume label %s.\n", volume_name);
+ else
+ printf("no volume label.\n");
+ }
+
+ /* Make the file allocation tables! */
+
+ if (malloc_entire_fat)
+ alloced_fat_length = fat_length;
+ else
+ alloced_fat_length = 1;
+
+ if ((fat =
+ (unsigned char *)malloc(alloced_fat_length * sector_size)) == NULL)
+ die("unable to allocate space for FAT image in memory");
+
+ memset(fat, 0, alloced_fat_length * sector_size);
+
+ mark_FAT_cluster(0, 0xffffffff); /* Initial fat entries */
+ mark_FAT_cluster(1, 0xffffffff);
+ fat[0] = (unsigned char)bs.media; /* Put media type in first byte! */
+ if (size_fat == 32) {
+ /* Mark cluster 2 as EOF (used for root dir) */
+ mark_FAT_cluster(2, FAT_EOF);
+ }
+
+ /* Make the root directory entries */
+
+ size_root_dir = (size_fat == 32) ?
+ bs.cluster_size * sector_size :
+ (((int)bs.dir_entries[1] * 256 + (int)bs.dir_entries[0]) *
+ sizeof(struct msdos_dir_entry));
+ if ((root_dir = (struct msdos_dir_entry *)malloc(size_root_dir)) == NULL) {
+ free(fat); /* Tidy up before we die! */
+ die("unable to allocate space for root directory in memory");
+ }
+
+ memset(root_dir, 0, size_root_dir);
+ if (memcmp(volume_name, NO_NAME, 11)) {
+ struct msdos_dir_entry *de = &root_dir[0];
+ memcpy(de->name, volume_name, 8);
+ memcpy(de->ext, volume_name + 8, 3);
+ de->attr = ATTR_VOLUME;
+ ctime = localtime(&create_time);
+ de->time = CT_LE_W((unsigned short)((ctime->tm_sec >> 1) +
+ (ctime->tm_min << 5) +
+ (ctime->tm_hour << 11)));
+ de->date =
+ CT_LE_W((unsigned short)(ctime->tm_mday +
+ ((ctime->tm_mon + 1) << 5) +
+ ((ctime->tm_year - 80) << 9)));
+ de->ctime_ms = 0;
+ de->ctime = de->time;
+ de->cdate = de->date;
+ de->adate = de->date;
+ de->starthi = CT_LE_W(0);
+ de->start = CT_LE_W(0);
+ de->size = CT_LE_L(0);
+ }
+
+ if (size_fat == 32) {
+ /* For FAT32, create an info sector */
+ struct fat32_fsinfo *info;
+
+ if (!(info_sector = malloc(sector_size)))
+ die("Out of memory");
+ memset(info_sector, 0, sector_size);
+ /* fsinfo structure is at offset 0x1e0 in info sector by observation */
+ info = (struct fat32_fsinfo *)(info_sector + 0x1e0);
+
+ /* Info sector magic */
+ info_sector[0] = 'R';
+ info_sector[1] = 'R';
+ info_sector[2] = 'a';
+ info_sector[3] = 'A';
+
+ /* Magic for fsinfo structure */
+ info->signature = CT_LE_L(0x61417272);
+ /* We've allocated cluster 2 for the root dir. */
+ info->free_clusters = CT_LE_L(cluster_count - 1);
+ info->next_cluster = CT_LE_L(2);
+
+ /* Info sector also must have boot sign */
+ *(__u16 *) (info_sector + 0x1fe) = CT_LE_W(BOOT_SIGN);
+ }
+
+ if (!(blank_sector = malloc(sector_size)))
+ die("Out of memory");
+ memset(blank_sector, 0, sector_size);
+}
+
+/* Write the new filesystem's data tables to wherever they're going to end up! */
+
+#define error(str) \
+ do { \
+ free (fat); \
+ if (info_sector) free (info_sector); \
+ free (root_dir); \
+ die (str); \
+ } while(0)
+
+#define seekto(pos,errstr) \
+ do { \
+ loff_t __pos = (pos); \
+ if (llseek (dev, __pos, SEEK_SET) != __pos) \
+ error ("seek to " errstr " failed whilst writing tables"); \
+ } while(0)
+
+#define writebuf(buf,size,errstr) \
+ do { \
+ int __size = (size); \
+ if (write (dev, buf, __size) != __size) \
+ error ("failed whilst writing " errstr); \
+ } while(0)
+
+static void write_tables(void)
+{
+ int x;
+ int fat_length;
+
+ fat_length = (size_fat == 32) ?
+ CF_LE_L(bs.fat32.fat32_length) : CF_LE_W(bs.fat_length);
+
+ seekto(0, "start of device");
+ /* clear all reserved sectors */
+ for (x = 0; x < reserved_sectors; ++x)
+ writebuf(blank_sector, sector_size, "reserved sector");
+ /* seek back to sector 0 and write the boot sector */
+ seekto(0, "boot sector");
+ writebuf((char *)&bs, sizeof(struct msdos_boot_sector), "boot sector");
+ /* on FAT32, write the info sector and backup boot sector */
+ if (size_fat == 32) {
+ seekto(CF_LE_W(bs.fat32.info_sector) * sector_size, "info sector");
+ writebuf(info_sector, 512, "info sector");
+ if (backup_boot != 0) {
+ seekto(backup_boot * sector_size, "backup boot sector");
+ writebuf((char *)&bs, sizeof(struct msdos_boot_sector),
+ "backup boot sector");
+ }
+ }
+ /* seek to start of FATS and write them all */
+ seekto(reserved_sectors * sector_size, "first FAT");
+ for (x = 1; x <= nr_fats; x++) {
+ int y;
+ int blank_fat_length = fat_length - alloced_fat_length;
+ writebuf(fat, alloced_fat_length * sector_size, "FAT");
+ for (y = 0; y < blank_fat_length; y++)
+ writebuf(blank_sector, sector_size, "FAT");
+ }
+ /* Write the root directory directly after the last FAT. This is the root
+ * dir area on FAT12/16, and the first cluster on FAT32. */
+ writebuf((char *)root_dir, size_root_dir, "root directory");
+
+ if (blank_sector)
+ free(blank_sector);
+ if (info_sector)
+ free(info_sector);
+ free(root_dir); /* Free up the root directory space from setup_tables */
+ free(fat); /* Free up the fat table space reserved during setup_tables */
+}
+
+/* Report the command usage and return a failure error code */
+
+void usage(void)
+{
+ fatal_error("\
+Usage: mkdosfs [-a][-A][-c][-C][-v][-I][-l bad-block-file][-b backup-boot-sector]\n\
+ [-m boot-msg-file][-n volume-name][-i volume-id]\n\
+ [-s sectors-per-cluster][-S logical-sector-size][-f number-of-FATs]\n\
+ [-h hidden-sectors][-F fat-size][-r root-dir-entries][-R reserved-sectors]\n\
+ /dev/name [blocks]\n");
+}
+
+/*
+ * ++roman: On m68k, check if this is an Atari; if yes, turn on Atari variant
+ * of MS-DOS filesystem by default.
+ */
+static void check_atari(void)
+{
+#ifdef __mc68000__
+ FILE *f;
+ char line[128], *p;
+
+ if (!(f = fopen("/proc/hardware", "r"))) {
+ perror("/proc/hardware");
+ return;
+ }
+
+ while (fgets(line, sizeof(line), f)) {
+ if (strncmp(line, "Model:", 6) == 0) {
+ p = line + 6;
+ p += strspn(p, " \t");
+ if (strncmp(p, "Atari ", 6) == 0)
+ atari_format = 1;
+ break;
+ }
+ }
+ fclose(f);
+#endif
+}
+
+/* The "main" entry point into the utility - we pick up the options and attempt to process them in some sort of sensible
+ way. In the event that some/all of the options are invalid we need to tell the user so that something can be done! */
+
+int main(int argc, char **argv)
+{
+ int c;
+ char *tmp;
+ char *listfile = NULL;
+ FILE *msgfile;
+ struct stat statbuf;
+ int i = 0, pos, ch;
+ int create = 0;
+ unsigned long long cblocks = 0;
+ int min_sector_size;
+
+ if (argc && *argv) { /* What's the program name? */
+ char *p;
+ program_name = *argv;
+ if ((p = strrchr(program_name, '/')))
+ program_name = p + 1;
+ }
+
+ gettimeofday(&create_timeval, NULL);
+ create_time = create_timeval.tv_sec;
+ volume_id = (u_int32_t) ((create_timeval.tv_sec << 20) | create_timeval.tv_usec); /* Default volume ID = creation time, fudged for more uniqueness */
+ check_atari();
+
+ printf("%s " VERSION " (" VERSION_DATE ")\n", program_name);
+
+ while ((c = getopt(argc, argv, "aAb:cCf:F:Ii:l:m:n:r:R:s:S:h:v")) != EOF)
+ /* Scan the command line for options */
+ switch (c) {
+ case 'A': /* toggle Atari format */
+ atari_format = !atari_format;
+ break;
+
+ case 'a': /* a : skip alignment */
+ align_structures = FALSE;
+ break;
+
+ case 'b': /* b : location of backup boot sector */
+ backup_boot = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || backup_boot < 2 || backup_boot > 0xffff) {
+ printf("Bad location for backup boot sector : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 'c': /* c : Check FS as we build it */
+ check = TRUE;
+ malloc_entire_fat = TRUE; /* Need to be able to mark clusters bad */
+ break;
+
+ case 'C': /* C : Create a new file */
+ create = TRUE;
+ break;
+
+ case 'f': /* f : Choose number of FATs */
+ nr_fats = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || nr_fats < 1 || nr_fats > 4) {
+ printf("Bad number of FATs : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 'F': /* F : Choose FAT size */
+ size_fat = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || (size_fat != 12 && size_fat != 16 && size_fat != 32)) {
+ printf("Bad FAT type : %s\n", optarg);
+ usage();
+ }
+ size_fat_by_user = 1;
+ break;
+
+ case 'h': /* h : number of hidden sectors */
+ hidden_sectors = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || hidden_sectors < 0) {
+ printf("Bad number of hidden sectors : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 'I':
+ ignore_full_disk = 1;
+ break;
+
+ case 'i': /* i : specify volume ID */
+ volume_id = strtoul(optarg, &tmp, 16);
+ if (*tmp) {
+ printf("Volume ID must be a hexadecimal number\n");
+ usage();
+ }
+ break;
+
+ case 'l': /* l : Bad block filename */
+ listfile = optarg;
+ malloc_entire_fat = TRUE; /* Need to be able to mark clusters bad */
+ break;
+
+ case 'm': /* m : Set boot message */
+ if (strcmp(optarg, "-")) {
+ msgfile = fopen(optarg, "r");
+ if (!msgfile)
+ perror(optarg);
+ } else
+ msgfile = stdin;
+
+ if (msgfile) {
+ /* The boot code ends at offset 448 and needs a null terminator */
+ i = MESSAGE_OFFSET;
+ pos = 0; /* We are at beginning of line */
+ do {
+ ch = getc(msgfile);
+ switch (ch) {
+ case '\r': /* Ignore CRs */
+ case '\0': /* and nulls */
+ break;
+
+ case '\n': /* LF -> CR+LF if necessary */
+ if (pos) { /* If not at beginning of line */
+ dummy_boot_code[i++] = '\r';
+ pos = 0;
+ }
+ dummy_boot_code[i++] = '\n';
+ break;
+
+ case '\t': /* Expand tabs */
+ do {
+ dummy_boot_code[i++] = ' ';
+ pos++;
+ }
+ while (pos % 8 && i < BOOTCODE_SIZE - 1);
+ break;
+
+ case EOF:
+ dummy_boot_code[i++] = '\0'; /* Null terminator */
+ break;
+
+ default:
+ dummy_boot_code[i++] = ch; /* Store character */
+ pos++; /* Advance position */
+ break;
+ }
+ }
+ while (ch != EOF && i < BOOTCODE_SIZE - 1);
+
+ /* Fill up with zeros */
+ while (i < BOOTCODE_SIZE - 1)
+ dummy_boot_code[i++] = '\0';
+ dummy_boot_code[BOOTCODE_SIZE - 1] = '\0'; /* Just in case */
+
+ if (ch != EOF)
+ printf("Warning: message too long; truncated\n");
+
+ if (msgfile != stdin)
+ fclose(msgfile);
+ }
+ break;
+
+ case 'n': /* n : Volume name */
+ sprintf(volume_name, "%-11.11s", optarg);
+ for (i = 0; i < 11; i++)
+ volume_name[i] = toupper(volume_name[i]);
+
+ break;
+
+ case 'r': /* r : Root directory entries */
+ root_dir_entries = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || root_dir_entries < 16 || root_dir_entries > 32768) {
+ printf("Bad number of root directory entries : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 'R': /* R : number of reserved sectors */
+ reserved_sectors = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || reserved_sectors < 1 || reserved_sectors > 0xffff) {
+ printf("Bad number of reserved sectors : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 's': /* s : Sectors per cluster */
+ sectors_per_cluster = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || (sectors_per_cluster != 1 && sectors_per_cluster != 2
+ && sectors_per_cluster != 4 && sectors_per_cluster != 8
+ && sectors_per_cluster != 16
+ && sectors_per_cluster != 32
+ && sectors_per_cluster != 64
+ && sectors_per_cluster != 128)) {
+ printf("Bad number of sectors per cluster : %s\n", optarg);
+ usage();
+ }
+ break;
+
+ case 'S': /* S : Sector size */
+ sector_size = (int)strtol(optarg, &tmp, 0);
+ if (*tmp || (sector_size != 512 && sector_size != 1024 &&
+ sector_size != 2048 && sector_size != 4096 &&
+ sector_size != 8192 && sector_size != 16384 &&
+ sector_size != 32768)) {
+ printf("Bad logical sector size : %s\n", optarg);
+ usage();
+ }
+ sector_size_set = 1;
+ break;
+
+ case 'v': /* v : Verbose execution */
+ ++verbose;
+ break;
+
+ default:
+ printf("Unknown option: %c\n", c);
+ usage();
+ }
+ if (optind < argc) {
+ device_name = argv[optind]; /* Determine the number of blocks in the FS */
+
+ if (!device_name) {
+ printf("No device specified.\n");
+ usage();
+ }
+
+ if (!create)
+ cblocks = count_blocks(device_name, &orphaned_sectors); /* Have a look and see! */
+ }
+ if (optind == argc - 2) { /* Either check the user specified number */
+ blocks = strtoull(argv[optind + 1], &tmp, 0);
+ if (!create && blocks != cblocks) {
+ fprintf(stderr, "Warning: block count mismatch: ");
+ fprintf(stderr, "found %llu but assuming %llu.\n", cblocks, blocks);
+ }
+ } else if (optind == argc - 1) { /* Or use value found */
+ if (create)
+ die("Need intended size with -C.");
+ blocks = cblocks;
+ tmp = "";
+ } else {
+ fprintf(stderr, "No device specified!\n");
+ usage();
+ }
+ if (*tmp) {
+ printf("Bad block count : %s\n", argv[optind + 1]);
+ usage();
+ }
+
+ if (check && listfile) /* Auto and specified bad block handling are mutually */
+ die("-c and -l are incompatible"); /* exclusive of each other! */
+
+ if (!create) {
+ check_mount(device_name); /* Is the device already mounted? */
+ dev = open(device_name, O_EXCL | O_RDWR); /* Is it a suitable device to build the FS on? */
+ if (dev < 0) {
+ fprintf(stderr, "%s: unable to open %s: %s\n", program_name,
+ device_name, strerror(errno));
+ exit(1); /* The error exit code is 1! */
+ }
+ } else {
+ loff_t offset = blocks * BLOCK_SIZE - 1;
+ char null = 0;
+ /* create the file */
+ dev = open(device_name, O_EXCL | O_RDWR | O_CREAT | O_TRUNC, 0666);
+ if (dev < 0)
+ die("unable to create %s");
+ /* seek to the intended end-1, and write one byte. this creates a
+ * sparse-as-possible file of appropriate size. */
+ if (llseek(dev, offset, SEEK_SET) != offset)
+ die("seek failed");
+ if (write(dev, &null, 1) < 0)
+ die("write failed");
+ if (llseek(dev, 0, SEEK_SET) != 0)
+ die("seek failed");
+ }
+
+ if (fstat(dev, &statbuf) < 0)
+ die("unable to stat %s");
+ if (!S_ISBLK(statbuf.st_mode)) {
+ statbuf.st_rdev = 0;
+ check = 0;
+ } else
+ /*
+ * Ignore any 'full' fixed disk devices, if -I is not given.
+ * On a MO-disk one doesn't need partitions. The filesytem can go
+ * directly to the whole disk. Under other OSes this is known as
+ * the 'superfloppy' format. As I don't know how to find out if
+ * this is a MO disk I introduce a -I (ignore) switch. -Joey
+ */
+ if (!ignore_full_disk && ((statbuf.st_rdev & 0xffffff3f) == 0x0300 || /* hda, hdb */
+ (statbuf.st_rdev & 0xffffff0f) == 0x0800 || /* sd */
+ (statbuf.st_rdev & 0xffffff3f) == 0x0d00 || /* xd */
+ (statbuf.st_rdev & 0xffffff3f) == 0x1600) /* hdc, hdd */
+ )
+ die("Device partition expected, not making filesystem on entire device '%s' (use -I to override)");
+
+ if (sector_size_set) {
+ if (ioctl(dev, BLKSSZGET, &min_sector_size) >= 0)
+ if (sector_size < min_sector_size) {
+ sector_size = min_sector_size;
+ fprintf(stderr,
+ "Warning: sector size was set to %d (minimal for this device)\n",
+ sector_size);
+ }
+ } else {
+ if (ioctl(dev, BLKSSZGET, &min_sector_size) >= 0) {
+ sector_size = min_sector_size;
+ sector_size_set = 1;
+ }
+ }
+
+ if (sector_size > 4096)
+ fprintf(stderr,
+ "Warning: sector size is set to %d > 4096, such filesystem will not propably mount\n",
+ sector_size);
+
+ establish_params(statbuf.st_rdev, statbuf.st_size);
+ /* Establish the media parameters */
+
+ setup_tables(); /* Establish the file system tables */
+
+ if (check) /* Determine any bad block locations and mark them */
+ check_blocks();
+ else if (listfile)
+ get_list_blocks(listfile);
+
+ write_tables(); /* Write the file system tables away! */
+
+ exit(0); /* Terminate with no errors! */
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 04:38:33 +0000