*
* Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+
+//usage:#define mkfs_ext2_trivial_usage
+//usage: "[-Fn] "
+/* //usage: "[-c|-l filename] " */
+//usage: "[-b BLK_SIZE] "
+/* //usage: "[-f fragment-size] [-g blocks-per-group] " */
+//usage: "[-i INODE_RATIO] [-I INODE_SIZE] "
+/* //usage: "[-j] [-J journal-options] [-N number-of-inodes] " */
+//usage: "[-m RESERVED_PERCENT] "
+/* //usage: "[-o creator-os] [-O feature[,...]] [-q] " */
+/* //usage: "[r fs-revision-level] [-E extended-options] [-v] [-F] " */
+//usage: "[-L LABEL] "
+/* //usage: "[-M last-mounted-directory] [-S] [-T filesystem-type] " */
+//usage: "BLOCKDEV [KBYTES]"
+//usage:#define mkfs_ext2_full_usage "\n\n"
+//usage: " -b BLK_SIZE Block size, bytes"
+/* //usage: "\n -c Check device for bad blocks" */
+/* //usage: "\n -E opts Set extended options" */
+/* //usage: "\n -f size Fragment size in bytes" */
+//usage: "\n -F Force"
+/* //usage: "\n -g N Number of blocks in a block group" */
+//usage: "\n -i RATIO Max number of files is filesystem_size / RATIO"
+//usage: "\n -I BYTES Inode size (min 128)"
+/* //usage: "\n -j Create a journal (ext3)" */
+/* //usage: "\n -J opts Set journal options (size/device)" */
+/* //usage: "\n -l file Read bad blocks list from file" */
+//usage: "\n -L LBL Volume label"
+//usage: "\n -m PERCENT Percent of blocks to reserve for admin"
+/* //usage: "\n -M dir Set last mounted directory" */
+//usage: "\n -n Dry run"
+/* //usage: "\n -N N Number of inodes to create" */
+/* //usage: "\n -o os Set the 'creator os' field" */
+/* //usage: "\n -O features Dir_index/filetype/has_journal/journal_dev/sparse_super" */
+/* //usage: "\n -q Quiet" */
+/* //usage: "\n -r rev Set filesystem revision" */
+/* //usage: "\n -S Write superblock and group descriptors only" */
+/* //usage: "\n -T fs-type Set usage type (news/largefile/largefile4)" */
+/* //usage: "\n -v Verbose" */
+
#include "libbb.h"
#include <linux/fs.h>
-#include <linux/ext2_fs.h>
-#include "volume_id/volume_id_internal.h"
+#include "bb_e2fs_defs.h"
-#define ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT 0
-#define ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX 1
-
-// from e2fsprogs
-#define s_reserved_gdt_blocks s_padding1
-#define s_mkfs_time s_reserved[0]
-#define s_flags s_reserved[22]
+#define ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT 0
+#define ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX 1
#define EXT2_HASH_HALF_MD4 1
#define EXT2_FLAGS_SIGNED_HASH 0x0001
#define STORE_LE(field, value) \
do { \
if (sizeof(field) == 4) \
- field = cpu_to_le32(value); \
+ field = SWAP_LE32(value); \
else if (sizeof(field) == 2) \
- field = cpu_to_le16(value); \
+ field = SWAP_LE16(value); \
else if (sizeof(field) == 1) \
field = (value); \
else \
} while (0)
#define FETCH_LE32(field) \
- (sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
+ (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
// All fields are little-endian
struct ext2_dir {
// only for directories, which never need i_size_high).
//
// Standard mke2fs creates a filesystem with 256-byte inodes if it is
-// bigger than 0.5GB. So far, we do not do this.
+// bigger than 0.5GB.
// Standard mke2fs 1.41.9:
// Usage: mke2fs [-c|-l filename] [-b block-size] [-f fragment-size]
-// [-i bytes-per-inode] [-I inode-size] [-J journal-options]
-// [-G meta group size] [-N number-of-inodes]
-// [-m reserved-blocks-percentage] [-o creator-os]
-// [-g blocks-per-group] [-L volume-label] [-M last-mounted-directory]
-// [-O feature[,...]] [-r fs-revision] [-E extended-option[,...]]
-// [-T fs-type] [-U UUID] [-jnqvFSV] device [blocks-count]
+// [-i bytes-per-inode] [-I inode-size] [-J journal-options]
+// [-G meta group size] [-N number-of-inodes]
+// [-m reserved-blocks-percentage] [-o creator-os]
+// [-g blocks-per-group] [-L volume-label] [-M last-mounted-directory]
+// [-O feature[,...]] [-r fs-revision] [-E extended-option[,...]]
+// [-T fs-type] [-U UUID] [-jnqvFSV] device [blocks-count]
//
// Options not commented below are taken but silently ignored:
enum {
// using global "option_mask32" instead of local "opts":
// we are register starved here
- opt_complementary = "-1:b+:m+:i+";
+ opt_complementary = "-1:b+:i+:I+:m+";
/*opts =*/ getopt32(argv, "cl:b:f:i:I:J:G:N:m:o:g:L:M:O:r:E:T:U:jnqvFS",
- NULL, &bs, NULL, &bpi, &user_inodesize, NULL, NULL, NULL,
- &reserved_percent, NULL, NULL, &label, NULL, NULL, NULL, NULL, NULL, NULL);
+ /*lbfi:*/ NULL, &bs, NULL, &bpi,
+ /*IJGN:*/ &user_inodesize, NULL, NULL, NULL,
+ /*mogL:*/ &reserved_percent, NULL, NULL, &label,
+ /*MOrE:*/ NULL, NULL, NULL, NULL,
+ /*TU:*/ NULL, NULL);
argv += optind; // argv[0] -- device
- // check the device is a block device
+ // open the device, check the device is a block device
xmove_fd(xopen(argv[0], O_WRONLY), fd);
- fstat(fd, &st);
+ xfstat(fd, &st, argv[0]);
if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_F))
- bb_error_msg_and_die("not a block device");
+ bb_error_msg_and_die("%s: not a block device", argv[0]);
// check if it is mounted
// N.B. what if we format a file? find_mount_point will return false negative since
- // it is loop block device which mounted!
+ // it is loop block device which is mounted!
if (find_mount_point(argv[0], 0))
bb_error_msg_and_die("can't format mounted filesystem");
- // open the device, get size in kbytes
- if (argv[1]) {
- kilobytes = xatoull(argv[1]);
- // seek past end fails on block devices but works on files
- if (lseek(fd, kilobytes * 1024 - 1, SEEK_SET) != (off_t)-1) {
- if (!(option_mask32 & OPT_n))
- xwrite(fd, "", 1); // file grows if needed
- }
- //else {
- // bb_error_msg("warning, block device is smaller");
- //}
- } else {
- kilobytes = (uoff_t)xlseek(fd, 0, SEEK_END) / 1024;
- }
+ // get size in kbytes
+ kilobytes = get_volume_size_in_bytes(fd, argv[1], 1024, /*extend:*/ !(option_mask32 & OPT_n)) / 1024;
bytes_per_inode = 16384;
if (kilobytes < 512*1024)
nreserved = (uint64_t)nblocks * reserved_percent / 100;
// N.B. killing e2fsprogs feature! Unused blocks don't account in calculations
- nblocks_full = nblocks;
+ nblocks_full = nblocks;
// If last block group is too small, nblocks may be decreased in order
// to discard it, and control returns here to recalculate some
STORE_LE(sb->s_magic, EXT2_SUPER_MAGIC);
STORE_LE(sb->s_inode_size, inodesize);
// set "Required extra isize" and "Desired extra isize" fields to 28
- if (inodesize != sizeof(*inode))
- STORE_LE(sb->s_reserved[21], 0x001C001C);
+ if (inodesize != sizeof(*inode)) {
+ STORE_LE(sb->s_min_extra_isize, 0x001c);
+ STORE_LE(sb->s_want_extra_isize, 0x001c);
+ }
STORE_LE(sb->s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
STORE_LE(sb->s_log_block_size, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE);
STORE_LE(sb->s_log_frag_size, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE);
// zero boot sectors
memset(buf, 0, blocksize);
- PUT(0, buf, 1024); // N.B. 1024 <= blocksize, so buf[0..1023] contains zeros
+ // Disabled: standard mke2fs doesn't do this, and
+ // on SPARC this destroys Sun disklabel.
+ // Users who need/want zeroing can easily do it with dd.
+ //PUT(0, buf, 1024); // N.B. 1024 <= blocksize, so buf[0..1023] contains zeros
+
// zero inode tables
for (i = 0; i < ngroups; ++i)
for (n = 0; n < inode_table_blocks; ++n)
projects / oweals / busybox.git / blobdiff