// 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 {
uint32_t inode_table_blocks;
uint32_t lost_and_found_blocks;
time_t timestamp;
- unsigned opts;
const char *label = "";
struct stat st;
struct ext2_super_block *sb; // superblock
struct ext2_dir *dir;
uint8_t *buf;
+ // using global "option_mask32" instead of local "opts":
+ // we are register starved here
opt_complementary = "-1:b+:m+:i+";
- opts = getopt32(argv, "cl:b:f:i:I:J:G:N:m:o:g:L:M:O:r:E:T:U:jnqvFS",
+ /*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);
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);
- if (!S_ISBLK(st.st_mode) && !(opts & OPT_F))
+ if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_F))
bb_error_msg_and_die("not a block device");
// 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) {
- 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)
bytes_per_inode = 4096;
if (kilobytes < 3*1024)
bytes_per_inode = 8192;
- if (opts & OPT_i)
+ if (option_mask32 & OPT_i)
bytes_per_inode = bpi;
// Determine block size and inode size
while ((kilobytes >> 22) >= blocksize)
blocksize *= 2;
}
- if (opts & OPT_b)
+ if (option_mask32 & OPT_b)
blocksize = bs;
if (blocksize < EXT2_MIN_BLOCK_SIZE
|| blocksize > EXT2_MAX_BLOCK_SIZE
bb_error_msg_and_die("blocksize %u is bad", blocksize);
}
// Do we have custom inode size?
- if (opts & OPT_I) {
+ if (option_mask32 & OPT_I) {
if (user_inodesize < sizeof(*inode)
|| user_inodesize > blocksize
|| (user_inodesize & (user_inodesize - 1)) // not power of 2
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
, inodes_per_group * ngroups, nblocks
, nreserved, reserved_percent
, first_block
- , group_desc_blocks * (blocksize / sizeof(*gd)) * blocks_per_group
+ , group_desc_blocks * (blocksize / (unsigned)sizeof(*gd)) * blocks_per_group
, ngroups
, blocks_per_group, blocks_per_group
, inodes_per_group
}
bb_putchar('\n');
- if (opts & OPT_n) {
+ if (option_mask32 & OPT_n) {
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return EXIT_SUCCESS;