#include "libbb.h"
#include <linux/fs.h>
#include <linux/ext2_fs.h>
-#include <sys/user.h> /* PAGE_SIZE */
-#ifndef PAGE_SIZE
-# define PAGE_SIZE 4096
-#endif
#include "volume_id/volume_id_internal.h"
#define ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT 0
-#define ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX 1
+#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 EXT2_HASH_HALF_MD4 1
-#define EXT2_FLAGS_SIGNED_HASH 0x0001
-// whiteout: for writable overlays
-//#define LINUX_S_IFWHT 0160000
-//#define EXT2_FEATURE_INCOMPAT_WHITEOUT 0x0020
+#define EXT2_HASH_HALF_MD4 1
+#define EXT2_FLAGS_SIGNED_HASH 0x0001
+#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
// storage helpers
char BUG_wrong_field_size(void);
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;
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",
- NULL, &bs, NULL, &bpi, NULL, NULL, NULL, NULL,
+ /*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
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
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
+ if (!(option_mask32 & OPT_n))
+ xwrite(fd, "", 1); // file grows if needed
}
//else {
// bb_error_msg("warning, block device is smaller");
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
+ // 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.
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 (option_mask32 & 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 (nblocks != kilobytes)
bb_error_msg_and_die("block count doesn't fit in 32 bits");
#define kilobytes kilobytes_unused_after_this
-//compat problem
-// if (blocksize < PAGE_SIZE)
-// nblocks &= ~((PAGE_SIZE >> blocksize_log2)-1);
// Experimentally, standard mke2fs won't work on images smaller than 60k
if (nblocks < 60)
bb_error_msg_and_die("need >= 60 blocks");
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
, 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;
// 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);
STORE_LE(sb->s_mkfs_time, timestamp);
STORE_LE(sb->s_wtime, timestamp);
STORE_LE(sb->s_lastcheck, timestamp);
- // misc
+ // misc. Values are chosen to match mke2fs 1.41.9
STORE_LE(sb->s_state, 1); // TODO: what's 1?
STORE_LE(sb->s_creator_os, EXT2_OS_LINUX);
STORE_LE(sb->s_checkinterval, 24*60*60 * 180); // 180 days
STORE_LE(sb->s_errors, EXT2_ERRORS_DEFAULT);
+ // mke2fs 1.41.9 also sets EXT3_FEATURE_COMPAT_RESIZE_INODE
+ // and if >= 0.5GB, EXT3_FEATURE_RO_COMPAT_LARGE_FILE.
+ // we use values which match "mke2fs -O ^resize_inode":
+ // in this case 1.41.9 never sets EXT3_FEATURE_RO_COMPAT_LARGE_FILE.
STORE_LE(sb->s_feature_compat, EXT2_FEATURE_COMPAT_SUPP
| (EXT2_FEATURE_COMPAT_RESIZE_INO * ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT)
| (EXT2_FEATURE_COMPAT_DIR_INDEX * ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX)
);
- // e2fsck from 1.41.9 doesn't like EXT2_FEATURE_INCOMPAT_WHITEOUT
- STORE_LE(sb->s_feature_incompat, EXT2_FEATURE_INCOMPAT_FILETYPE);// | EXT2_FEATURE_INCOMPAT_WHITEOUT;
+ STORE_LE(sb->s_feature_incompat, EXT2_FEATURE_INCOMPAT_FILETYPE);
STORE_LE(sb->s_feature_ro_compat, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
- STORE_LE(sb->s_flags, EXT2_FLAGS_SIGNED_HASH * ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX);
+ STORE_LE(sb->s_flags, EXT2_FLAGS_UNSIGNED_HASH * ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX);
generate_uuid(sb->s_uuid);
if (ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX) {
STORE_LE(sb->s_def_hash_version, EXT2_HASH_HALF_MD4);
// 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 / oweals / busybox.git / blobdiff