/* "[-c|-l filename] " */ \
"[-b BLK_SIZE] " \
/* "[-f fragment-size] [-g blocks-per-group] " */ \
- "[-i BYTES_PER_INODE] " \
+ "[-i INODE_RATIO] [-I INODE_SIZE] " \
/* "[-j] [-J journal-options] [-N number-of-inodes] " */ \
"[-m RESERVED_PERCENT] " \
/* "[-o creator-os] [-O feature[,...]] [-q] " */ \
"[-L LABEL] " \
"[-n] " \
/* "[-M last-mounted-directory] [-S] [-T filesystem-type] " */ \
- "DEVICE [KBYTES]"
+ "BLOCKDEV [KBYTES]"
#define mkfs_ext2_full_usage "\n" \
- "\n -b BLK_SIZE Block size in bytes" \
-/* "\n -c Check for bad blocks before creating" */ \
+ "\n -b BLK_SIZE Block size, bytes" \
+/* "\n -c Check device for bad blocks" */ \
/* "\n -E opts Set extended options" */ \
/* "\n -f size Fragment size in bytes" */ \
/* "\n -F Force (ignore sanity checks)" */ \
/* "\n -g num Number of blocks in a block group" */ \
- "\n -i BYTES The bytes/inode ratio" \
+ "\n -i RATIO Set max number of files to filesystem_size / RATIO" \
+ "\n -I BYTES Inode size (min 128)" \
/* "\n -j Create a journal (ext3)" */ \
/* "\n -J opts Set journal options (size/device)" */ \
/* "\n -l file Read bad blocks list from file" */ \
/* "\n -v Verbose" */ \
#define mkfs_minix_trivial_usage \
- "[-c | -l filename] [-nXX] [-iXX] /dev/name [blocks]"
+ "[-c | -l filename] [-nXX] [-iXX] BLOCKDEV [KBYTES]"
#define mkfs_minix_full_usage "\n\n" \
"Make a MINIX filesystem\n" \
"\nOptions:" \
"\n -v Make version 2 filesystem" \
#define mkfs_vfat_trivial_usage \
- "[-v] [-n LABEL] FILE_OR_DEVICE [SIZE_IN_KB]"
+ "[-v] [-n LABEL] BLOCKDEV [KBYTES]"
/* Accepted but ignored:
"[-c] [-C] [-I] [-l bad-block-file] [-b backup-boot-sector] "
"[-m boot-msg-file] [-i volume-id] "
OPT_b = 1 << 2, // block size, in bytes
OPT_f = 1 << 3,
OPT_i = 1 << 4, // bytes per inode
- OPT_I = 1 << 5,
+ OPT_I = 1 << 5, // custom inode size, in bytes
OPT_J = 1 << 6,
OPT_G = 1 << 7,
OPT_N = 1 << 8,
unsigned i, pos, n;
unsigned bs, bpi;
unsigned blocksize, blocksize_log2;
+ unsigned inodesize, user_inodesize;
unsigned reserved_percent = 5;
unsigned long long kilobytes;
uint32_t nblocks, nblocks_full;
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",
- NULL, &bs, NULL, &bpi, NULL, NULL, NULL, NULL,
+ 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
if (opts & OPT_i)
bytes_per_inode = bpi;
- // Determine block size
+ // Determine block size and inode size
// block size is a multiple of 1024
+ // inode size is a multiple of 128
blocksize = 1024;
- if (kilobytes >= 512*1024) // mke2fs 1.41.9 compat
+ inodesize = sizeof(struct ext2_inode); // 128
+ if (kilobytes >= 512*1024) { // mke2fs 1.41.9 compat
blocksize = 4096;
+ inodesize = 256;
+ }
if (EXT2_MAX_BLOCK_SIZE > 4096) {
// kilobytes >> 22 == size in 4gigabyte chunks.
// if size >= 16k gigs, blocksize must be increased.
) {
bb_error_msg_and_die("blocksize %u is bad", blocksize);
}
+ // Do we have custom inode size?
+ if (opts & OPT_I) {
+ if (user_inodesize < sizeof(*inode)
+ || user_inodesize > blocksize
+ || (user_inodesize & (user_inodesize - 1)) // not power of 2
+ ) {
+ bb_error_msg("-%c is bad", 'I');
+ } else {
+ inodesize = user_inodesize;
+ }
+ }
+
if ((int32_t)bytes_per_inode < blocksize)
bb_error_msg_and_die("-%c is bad", 'i');
// number of bits in one block, i.e. 8*blocksize
if (inodes_per_group > blocks_per_group)
inodes_per_group = blocks_per_group;
// adjust inodes per group so they completely fill the inode table blocks in the descriptor
-//incompatibility on images >= 0.5GB:
-//difference in sizeof(*inode) sometimes
-//results in slightly bigger inodes_per_group here
-//compared to standard mke2fs:
- inodes_per_group = (div_roundup(inodes_per_group * sizeof(*inode), blocksize) * blocksize) / sizeof(*inode);
+ inodes_per_group = (div_roundup(inodes_per_group * inodesize, blocksize) * blocksize) / inodesize;
// make sure the number of inodes per group is a multiple of 8
inodes_per_group &= ~7;
- inode_table_blocks = div_roundup(inodes_per_group * sizeof(*inode), blocksize);
+ inode_table_blocks = div_roundup(inodes_per_group * inodesize, blocksize);
// to be useful, lost+found should occupy at least 2 blocks (but not exceeding 16*1024 bytes),
// and at most EXT2_NDIR_BLOCKS. So reserve these blocks right now
// fill the superblock
sb = xzalloc(1024);
- STORE_LE(sb->s_rev_level, 1); // revision 1 filesystem
+ STORE_LE(sb->s_rev_level, EXT2_DYNAMIC_REV); // revision 1 filesystem
STORE_LE(sb->s_magic, EXT2_SUPER_MAGIC);
-//incompatibility:
-//on images > 0.5GB, standard mke2fs uses 256 byte inodes.
-//we always use 128 byte ones:
- STORE_LE(sb->s_inode_size, sizeof(*inode));
+ 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);
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);
// dump root dir inode
STORE_LE(inode->i_links_count, 3); // "/.", "/..", "/lost+found/.." point to this inode
STORE_LE(inode->i_block[0], FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks);
- PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_ROOT_INO-1) * sizeof(*inode),
- buf, sizeof(*inode));
+ PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_ROOT_INO-1) * inodesize,
+ buf, inodesize);
// dump lost+found dir inode
STORE_LE(inode->i_links_count, 2); // both "/lost+found" and "/lost+found/." point to this inode
for (i = 0; i < lost_and_found_blocks; ++i)
STORE_LE(inode->i_block[i], i + n); // use next block
//bb_info_msg("LAST BLOCK USED[%u]", i + n);
- PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_GOOD_OLD_FIRST_INO-1) * sizeof(*inode),
- buf, sizeof(*inode));
+ PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_GOOD_OLD_FIRST_INO-1) * inodesize,
+ buf, inodesize);
// dump directories
memset(buf, 0, blocksize);
projects / platform / upstream / busybox.git / commitdiff