1 /* vi: set sw=4 ts=4: */
3 * mkfs_ext2: utility to create EXT2 filesystem
4 * inspired by genext2fs
6 * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
8 * Licensed under GPLv2, see file LICENSE in this tarball for details.
12 #include <linux/ext2_fs.h>
13 #include "volume_id/volume_id_internal.h"
15 #define ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT 0
16 #define ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX 1
19 #define s_reserved_gdt_blocks s_padding1
20 #define s_mkfs_time s_reserved[0]
21 #define s_flags s_reserved[22]
23 #define EXT2_HASH_HALF_MD4 1
24 #define EXT2_FLAGS_SIGNED_HASH 0x0001
25 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002
28 char BUG_wrong_field_size(void);
29 #define STORE_LE(field, value) \
31 if (sizeof(field) == 4) \
32 field = cpu_to_le32(value); \
33 else if (sizeof(field) == 2) \
34 field = cpu_to_le16(value); \
35 else if (sizeof(field) == 1) \
38 BUG_wrong_field_size(); \
41 #define FETCH_LE32(field) \
42 (sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
44 // All fields are little-endian
63 static unsigned int_log2(unsigned arg)
66 while ((arg >>= 1) != 0)
71 // taken from mkfs_minix.c. libbb candidate?
72 // "uint32_t size", since we never use it for anything >32 bits
73 static uint32_t div_roundup(uint32_t size, uint32_t n)
76 uint32_t res = size / n;
82 static void allocate(uint8_t *bitmap, uint32_t blocksize, uint32_t start, uint32_t end)
86 //bb_info_msg("ALLOC: [%u][%u][%u]: [%u-%u]:=[%x],[%x]", blocksize, start, end, start/8, blocksize - end/8 - 1, (1 << (start & 7)) - 1, (uint8_t)(0xFF00 >> (end & 7)));
87 memset(bitmap, 0, blocksize);
89 memset(bitmap, 0xFF, i);
90 bitmap[i] = (1 << (start & 7)) - 1; //0..7 => 00000000..01111111
92 bitmap[blocksize - i - 1] |= 0x7F00 >> (end & 7); //0..7 => 00000000..11111110
93 memset(bitmap + blocksize - i, 0xFF, i); // N.B. no overflow here!
96 static uint32_t has_super(uint32_t x)
98 // 0, 1 and powers of 3, 5, 7 up to 2^32 limit
99 static const uint32_t supers[] = {
100 0, 1, 3, 5, 7, 9, 25, 27, 49, 81, 125, 243, 343, 625, 729,
101 2187, 2401, 3125, 6561, 15625, 16807, 19683, 59049, 78125,
102 117649, 177147, 390625, 531441, 823543, 1594323, 1953125,
103 4782969, 5764801, 9765625, 14348907, 40353607, 43046721,
104 48828125, 129140163, 244140625, 282475249, 387420489,
105 1162261467, 1220703125, 1977326743, 3486784401/* >2^31 */,
107 const uint32_t *sp = supers + ARRAY_SIZE(supers);
117 #define fd 3 /* predefined output descriptor */
119 static void PUT(uint64_t off, void *buf, uint32_t size)
121 // bb_info_msg("PUT[%llu]:[%u]", off, size);
122 xlseek(fd, off, SEEK_SET);
123 xwrite(fd, buf, size);
126 // 128 and 256-byte inodes:
127 // 128-byte inode is described by struct ext2_inode.
128 // 256-byte one just has these fields appended:
129 // __u16 i_extra_isize;
131 // __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
132 // __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */
133 // __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
134 // __u32 i_crtime; /* File creation time */
135 // __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
136 // __u32 i_version_hi; /* high 32 bits for 64-bit version */
137 // the rest is padding.
139 // linux/ext2_fs.h has "#define i_size_high i_dir_acl" which suggests that even
140 // 128-byte inode is capable of describing large files (i_dir_acl is meaningful
141 // only for directories, which never need i_size_high).
143 // Standard mke2fs creates a filesystem with 256-byte inodes if it is
144 // bigger than 0.5GB. So far, we do not do this.
146 // Standard mke2fs 1.41.9:
147 // Usage: mke2fs [-c|-l filename] [-b block-size] [-f fragment-size]
148 // [-i bytes-per-inode] [-I inode-size] [-J journal-options]
149 // [-G meta group size] [-N number-of-inodes]
150 // [-m reserved-blocks-percentage] [-o creator-os]
151 // [-g blocks-per-group] [-L volume-label] [-M last-mounted-directory]
152 // [-O feature[,...]] [-r fs-revision] [-E extended-option[,...]]
153 // [-T fs-type] [-U UUID] [-jnqvFSV] device [blocks-count]
155 // Options not commented below are taken but silently ignored:
159 OPT_b = 1 << 2, // block size, in bytes
161 OPT_i = 1 << 4, // bytes per inode
162 OPT_I = 1 << 5, // custom inode size, in bytes
166 OPT_m = 1 << 9, // percentage of blocks reserved for superuser
169 OPT_L = 1 << 12, // label
177 OPT_n = 1 << 20, // dry run: do not write anything
182 //OPT_V = 1 << 25, // -V version. bbox applets don't support that
185 int mkfs_ext2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
186 int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv)
190 unsigned blocksize, blocksize_log2;
191 unsigned inodesize, user_inodesize;
192 unsigned reserved_percent = 5;
193 unsigned long long kilobytes;
194 uint32_t nblocks, nblocks_full;
197 uint32_t bytes_per_inode;
198 uint32_t first_block;
199 uint32_t inodes_per_group;
200 uint32_t group_desc_blocks;
201 uint32_t inode_table_blocks;
202 uint32_t lost_and_found_blocks;
204 const char *label = "";
206 struct ext2_super_block *sb; // superblock
207 struct ext2_group_desc *gd; // group descriptors
208 struct ext2_inode *inode;
209 struct ext2_dir *dir;
212 // using global "option_mask32" instead of local "opts":
213 // we are register starved here
214 opt_complementary = "-1:b+:m+:i+";
215 /*opts =*/ getopt32(argv, "cl:b:f:i:I:J:G:N:m:o:g:L:M:O:r:E:T:U:jnqvFS",
216 NULL, &bs, NULL, &bpi, &user_inodesize, NULL, NULL, NULL,
217 &reserved_percent, NULL, NULL, &label, NULL, NULL, NULL, NULL, NULL, NULL);
218 argv += optind; // argv[0] -- device
220 // open the device, check the device is a block device
221 xmove_fd(xopen(argv[0], O_WRONLY), fd);
223 if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_F))
224 bb_error_msg_and_die("not a block device");
226 // check if it is mounted
227 // N.B. what if we format a file? find_mount_point will return false negative since
228 // it is loop block device which is mounted!
229 if (find_mount_point(argv[0], 0))
230 bb_error_msg_and_die("can't format mounted filesystem");
232 // get size in kbytes
233 kilobytes = get_volume_size_in_bytes(fd, argv[1], 1024, /*extend:*/ !(option_mask32 & OPT_n)) / 1024;
235 bytes_per_inode = 16384;
236 if (kilobytes < 512*1024)
237 bytes_per_inode = 4096;
238 if (kilobytes < 3*1024)
239 bytes_per_inode = 8192;
240 if (option_mask32 & OPT_i)
241 bytes_per_inode = bpi;
243 // Determine block size and inode size
244 // block size is a multiple of 1024
245 // inode size is a multiple of 128
247 inodesize = sizeof(struct ext2_inode); // 128
248 if (kilobytes >= 512*1024) { // mke2fs 1.41.9 compat
252 if (EXT2_MAX_BLOCK_SIZE > 4096) {
253 // kilobytes >> 22 == size in 4gigabyte chunks.
254 // if size >= 16k gigs, blocksize must be increased.
255 // Try "mke2fs -F image $((16 * 1024*1024*1024))"
256 while ((kilobytes >> 22) >= blocksize)
259 if (option_mask32 & OPT_b)
261 if (blocksize < EXT2_MIN_BLOCK_SIZE
262 || blocksize > EXT2_MAX_BLOCK_SIZE
263 || (blocksize & (blocksize - 1)) // not power of 2
265 bb_error_msg_and_die("blocksize %u is bad", blocksize);
267 // Do we have custom inode size?
268 if (option_mask32 & OPT_I) {
269 if (user_inodesize < sizeof(*inode)
270 || user_inodesize > blocksize
271 || (user_inodesize & (user_inodesize - 1)) // not power of 2
273 bb_error_msg("-%c is bad", 'I');
275 inodesize = user_inodesize;
279 if ((int32_t)bytes_per_inode < blocksize)
280 bb_error_msg_and_die("-%c is bad", 'i');
281 // number of bits in one block, i.e. 8*blocksize
282 #define blocks_per_group (8 * blocksize)
283 first_block = (EXT2_MIN_BLOCK_SIZE == blocksize);
284 blocksize_log2 = int_log2(blocksize);
286 // Determine number of blocks
287 kilobytes >>= (blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE);
289 if (nblocks != kilobytes)
290 bb_error_msg_and_die("block count doesn't fit in 32 bits");
291 #define kilobytes kilobytes_unused_after_this
292 // Experimentally, standard mke2fs won't work on images smaller than 60k
294 bb_error_msg_and_die("need >= 60 blocks");
296 // How many reserved blocks?
297 if (reserved_percent > 50)
298 bb_error_msg_and_die("-%c is bad", 'm');
299 nreserved = (uint64_t)nblocks * reserved_percent / 100;
301 // N.B. killing e2fsprogs feature! Unused blocks don't account in calculations
302 nblocks_full = nblocks;
304 // If last block group is too small, nblocks may be decreased in order
305 // to discard it, and control returns here to recalculate some
307 // Note: blocksize and bytes_per_inode are never recalculated.
309 // N.B. a block group can have no more than blocks_per_group blocks
310 ngroups = div_roundup(nblocks - first_block, blocks_per_group);
312 group_desc_blocks = div_roundup(ngroups, blocksize / sizeof(*gd));
313 // TODO: reserved blocks must be marked as such in the bitmaps,
314 // or resulting filesystem is corrupt
315 if (ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT) {
317 * From e2fsprogs: Calculate the number of GDT blocks to reserve for online
319 * The absolute maximum number of GDT blocks we can reserve is determined by
320 * the number of block pointers that can fit into a single block.
321 * We set it at 1024x the current filesystem size, or
322 * the upper block count limit (2^32), whichever is lower.
324 uint32_t reserved_group_desc_blocks = 0xFFFFFFFF; // maximum block number
325 if (nblocks < reserved_group_desc_blocks / 1024)
326 reserved_group_desc_blocks = nblocks * 1024;
327 reserved_group_desc_blocks = div_roundup(reserved_group_desc_blocks - first_block, blocks_per_group);
328 reserved_group_desc_blocks = div_roundup(reserved_group_desc_blocks, blocksize / sizeof(*gd)) - group_desc_blocks;
329 if (reserved_group_desc_blocks > blocksize / sizeof(uint32_t))
330 reserved_group_desc_blocks = blocksize / sizeof(uint32_t);
331 //TODO: STORE_LE(sb->s_reserved_gdt_blocks, reserved_group_desc_blocks);
332 group_desc_blocks += reserved_group_desc_blocks;
336 // N.B. e2fsprogs does as follows!
337 uint32_t overhead, remainder;
338 // ninodes is the max number of inodes in this filesystem
339 uint32_t ninodes = ((uint64_t) nblocks_full * blocksize) / bytes_per_inode;
340 if (ninodes < EXT2_GOOD_OLD_FIRST_INO+1)
341 ninodes = EXT2_GOOD_OLD_FIRST_INO+1;
342 inodes_per_group = div_roundup(ninodes, ngroups);
343 // minimum number because the first EXT2_GOOD_OLD_FIRST_INO-1 are reserved
344 if (inodes_per_group < 16)
345 inodes_per_group = 16;
346 // a block group can't have more inodes than blocks
347 if (inodes_per_group > blocks_per_group)
348 inodes_per_group = blocks_per_group;
349 // adjust inodes per group so they completely fill the inode table blocks in the descriptor
350 inodes_per_group = (div_roundup(inodes_per_group * inodesize, blocksize) * blocksize) / inodesize;
351 // make sure the number of inodes per group is a multiple of 8
352 inodes_per_group &= ~7;
353 inode_table_blocks = div_roundup(inodes_per_group * inodesize, blocksize);
355 // to be useful, lost+found should occupy at least 2 blocks (but not exceeding 16*1024 bytes),
356 // and at most EXT2_NDIR_BLOCKS. So reserve these blocks right now
357 /* Or e2fsprogs comment verbatim (what does it mean?):
358 * Ensure that lost+found is at least 2 blocks, so we always
359 * test large empty blocks for big-block filesystems. */
360 lost_and_found_blocks = MIN(EXT2_NDIR_BLOCKS, 16 >> (blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE));
362 // the last group needs more attention: isn't it too small for possible overhead?
363 overhead = (has_super(ngroups - 1) ? (1/*sb*/ + group_desc_blocks) : 0) + 1/*bbmp*/ + 1/*ibmp*/ + inode_table_blocks;
364 remainder = (nblocks - first_block) % blocks_per_group;
365 ////can't happen, nblocks >= 60 guarantees this
366 ////if ((1 == ngroups)
368 //// && (remainder < overhead + 1/* "/" */ + lost_and_found_blocks)
370 //// bb_error_msg_and_die("way small device");
373 // Standard mke2fs uses 50. Looks like a bug in our calculation
374 // of "remainder" or "overhead" - we don't match standard mke2fs
375 // when we transition from one group to two groups
376 // (a bit after 8M image size), but it works for two->three groups
377 // transition (at 16M).
378 if (remainder && (remainder < overhead + 50)) {
379 //bb_info_msg("CHOP[%u]", remainder);
380 nblocks -= remainder;
385 if (nblocks_full - nblocks)
386 printf("warning: %u blocks unused\n\n", nblocks_full - nblocks);
388 "Filesystem label=%s\n"
390 "Block size=%u (log=%u)\n"
391 "Fragment size=%u (log=%u)\n"
392 "%u inodes, %u blocks\n"
393 "%u blocks (%u%%) reserved for the super user\n"
394 "First data block=%u\n"
395 "Maximum filesystem blocks=%u\n"
397 "%u blocks per group, %u fragments per group\n"
398 "%u inodes per group"
400 , blocksize, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE
401 , blocksize, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE
402 , inodes_per_group * ngroups, nblocks
403 , nreserved, reserved_percent
405 , group_desc_blocks * (blocksize / (unsigned)sizeof(*gd)) * blocks_per_group
407 , blocks_per_group, blocks_per_group
411 const char *fmt = "\nSuperblock backups stored on blocks:\n"
414 for (i = 1; i < ngroups; i++) {
415 pos += blocks_per_group;
417 printf(fmt, (unsigned)pos);
424 if (option_mask32 & OPT_n) {
425 if (ENABLE_FEATURE_CLEAN_UP)
430 // TODO: 3/5 refuse if mounted
431 // TODO: 4/5 compat options
432 // TODO: 1/5 sanity checks
433 // TODO: 0/5 more verbose error messages
434 // TODO: 4/5 bigendianness: recheck, wait for ARM reporters
435 // TODO: 2/5 reserved GDT: how to mark but not allocate?
436 // TODO: 3/5 dir_index?
438 // fill the superblock
440 STORE_LE(sb->s_rev_level, EXT2_DYNAMIC_REV); // revision 1 filesystem
441 STORE_LE(sb->s_magic, EXT2_SUPER_MAGIC);
442 STORE_LE(sb->s_inode_size, inodesize);
443 // set "Required extra isize" and "Desired extra isize" fields to 28
444 if (inodesize != sizeof(*inode))
445 STORE_LE(sb->s_reserved[21], 0x001C001C);
446 STORE_LE(sb->s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
447 STORE_LE(sb->s_log_block_size, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE);
448 STORE_LE(sb->s_log_frag_size, blocksize_log2 - EXT2_MIN_BLOCK_LOG_SIZE);
449 // first 1024 bytes of the device are for boot record. If block size is 1024 bytes, then
450 // the first block is 1, otherwise 0
451 STORE_LE(sb->s_first_data_block, first_block);
452 // block and inode bitmaps occupy no more than one block, so maximum number of blocks is
453 STORE_LE(sb->s_blocks_per_group, blocks_per_group);
454 STORE_LE(sb->s_frags_per_group, blocks_per_group);
456 STORE_LE(sb->s_blocks_count, nblocks);
457 // reserve blocks for superuser
458 STORE_LE(sb->s_r_blocks_count, nreserved);
460 STORE_LE(sb->s_inodes_per_group, inodes_per_group);
461 STORE_LE(sb->s_inodes_count, inodes_per_group * ngroups);
462 STORE_LE(sb->s_free_inodes_count, inodes_per_group * ngroups - EXT2_GOOD_OLD_FIRST_INO);
464 timestamp = time(NULL);
465 STORE_LE(sb->s_mkfs_time, timestamp);
466 STORE_LE(sb->s_wtime, timestamp);
467 STORE_LE(sb->s_lastcheck, timestamp);
468 // misc. Values are chosen to match mke2fs 1.41.9
469 STORE_LE(sb->s_state, 1); // TODO: what's 1?
470 STORE_LE(sb->s_creator_os, EXT2_OS_LINUX);
471 STORE_LE(sb->s_checkinterval, 24*60*60 * 180); // 180 days
472 STORE_LE(sb->s_errors, EXT2_ERRORS_DEFAULT);
473 // mke2fs 1.41.9 also sets EXT3_FEATURE_COMPAT_RESIZE_INODE
474 // and if >= 0.5GB, EXT3_FEATURE_RO_COMPAT_LARGE_FILE.
475 // we use values which match "mke2fs -O ^resize_inode":
476 // in this case 1.41.9 never sets EXT3_FEATURE_RO_COMPAT_LARGE_FILE.
477 STORE_LE(sb->s_feature_compat, EXT2_FEATURE_COMPAT_SUPP
478 | (EXT2_FEATURE_COMPAT_RESIZE_INO * ENABLE_FEATURE_MKFS_EXT2_RESERVED_GDT)
479 | (EXT2_FEATURE_COMPAT_DIR_INDEX * ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX)
481 STORE_LE(sb->s_feature_incompat, EXT2_FEATURE_INCOMPAT_FILETYPE);
482 STORE_LE(sb->s_feature_ro_compat, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
483 STORE_LE(sb->s_flags, EXT2_FLAGS_UNSIGNED_HASH * ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX);
484 generate_uuid(sb->s_uuid);
485 if (ENABLE_FEATURE_MKFS_EXT2_DIR_INDEX) {
486 STORE_LE(sb->s_def_hash_version, EXT2_HASH_HALF_MD4);
487 generate_uuid((uint8_t *)sb->s_hash_seed);
490 * From e2fsprogs: add "jitter" to the superblock's check interval so that we
491 * don't check all the filesystems at the same time. We use a
492 * kludgy hack of using the UUID to derive a random jitter value.
494 STORE_LE(sb->s_max_mnt_count,
495 EXT2_DFL_MAX_MNT_COUNT
496 + (sb->s_uuid[ARRAY_SIZE(sb->s_uuid)-1] % EXT2_DFL_MAX_MNT_COUNT));
499 safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
501 // calculate filesystem skeleton structures
502 gd = xzalloc(group_desc_blocks * blocksize);
503 buf = xmalloc(blocksize);
504 sb->s_free_blocks_count = 0;
505 for (i = 0, pos = first_block, n = nblocks - first_block;
507 i++, pos += blocks_per_group, n -= blocks_per_group
509 uint32_t overhead = pos + (has_super(i) ? (1/*sb*/ + group_desc_blocks) : 0);
510 uint32_t free_blocks;
511 // fill group descriptors
512 STORE_LE(gd[i].bg_block_bitmap, overhead + 0);
513 STORE_LE(gd[i].bg_inode_bitmap, overhead + 1);
514 STORE_LE(gd[i].bg_inode_table, overhead + 2);
515 overhead = overhead - pos + 1/*bbmp*/ + 1/*ibmp*/ + inode_table_blocks;
516 gd[i].bg_free_inodes_count = inodes_per_group;
517 //STORE_LE(gd[i].bg_used_dirs_count, 0);
518 // N.B. both "/" and "/lost+found" are within the first block group
519 // "/" occupies 1 block, "/lost+found" occupies lost_and_found_blocks...
521 // ... thus increased overhead for the first block group ...
522 overhead += 1 + lost_and_found_blocks;
523 // ... and 2 used directories
524 STORE_LE(gd[i].bg_used_dirs_count, 2);
525 // well known reserved inodes belong to the first block too
526 gd[i].bg_free_inodes_count -= EXT2_GOOD_OLD_FIRST_INO;
529 // cache free block count of the group
530 free_blocks = (n < blocks_per_group ? n : blocks_per_group) - overhead;
532 // mark preallocated blocks as allocated
533 //bb_info_msg("ALLOC: [%u][%u][%u]", blocksize, overhead, blocks_per_group - (free_blocks + overhead));
534 allocate(buf, blocksize,
535 // reserve "overhead" blocks
537 // mark unused trailing blocks
538 blocks_per_group - (free_blocks + overhead)
541 PUT((uint64_t)(FETCH_LE32(gd[i].bg_block_bitmap)) * blocksize, buf, blocksize);
542 STORE_LE(gd[i].bg_free_blocks_count, free_blocks);
544 // mark preallocated inodes as allocated
545 allocate(buf, blocksize,
546 // mark reserved inodes
547 inodes_per_group - gd[i].bg_free_inodes_count,
548 // mark unused trailing inodes
549 blocks_per_group - inodes_per_group
552 //PUT((uint64_t)(FETCH_LE32(gd[i].bg_block_bitmap)) * blocksize, buf, blocksize);
553 //but it's right after block bitmap, so we can just:
554 xwrite(fd, buf, blocksize);
555 STORE_LE(gd[i].bg_free_inodes_count, gd[i].bg_free_inodes_count);
557 // count overall free blocks
558 sb->s_free_blocks_count += free_blocks;
560 STORE_LE(sb->s_free_blocks_count, sb->s_free_blocks_count);
562 // dump filesystem skeleton structures
563 // printf("Writing superblocks and filesystem accounting information: ");
564 for (i = 0, pos = first_block; i < ngroups; i++, pos += blocks_per_group) {
565 // dump superblock and group descriptors and their backups
567 // N.B. 1024 byte blocks are special
568 PUT(((uint64_t)pos * blocksize) + ((0 == i && 1024 != blocksize) ? 1024 : 0),
570 PUT(((uint64_t)pos * blocksize) + blocksize,
571 gd, group_desc_blocks * blocksize);
576 memset(buf, 0, blocksize);
577 PUT(0, buf, 1024); // N.B. 1024 <= blocksize, so buf[0..1023] contains zeros
579 for (i = 0; i < ngroups; ++i)
580 for (n = 0; n < inode_table_blocks; ++n)
581 PUT((uint64_t)(FETCH_LE32(gd[i].bg_inode_table) + n) * blocksize,
584 // prepare directory inode
585 inode = (struct ext2_inode *)buf;
586 STORE_LE(inode->i_mode, S_IFDIR | S_IRWXU | S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH);
587 STORE_LE(inode->i_mtime, timestamp);
588 STORE_LE(inode->i_atime, timestamp);
589 STORE_LE(inode->i_ctime, timestamp);
590 STORE_LE(inode->i_size, blocksize);
591 // inode->i_blocks stores the number of 512 byte data blocks
592 // (512, because it goes directly to struct stat without scaling)
593 STORE_LE(inode->i_blocks, blocksize / 512);
595 // dump root dir inode
596 STORE_LE(inode->i_links_count, 3); // "/.", "/..", "/lost+found/.." point to this inode
597 STORE_LE(inode->i_block[0], FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks);
598 PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_ROOT_INO-1) * inodesize,
601 // dump lost+found dir inode
602 STORE_LE(inode->i_links_count, 2); // both "/lost+found" and "/lost+found/." point to this inode
603 STORE_LE(inode->i_size, lost_and_found_blocks * blocksize);
604 STORE_LE(inode->i_blocks, (lost_and_found_blocks * blocksize) / 512);
605 n = FETCH_LE32(inode->i_block[0]) + 1;
606 for (i = 0; i < lost_and_found_blocks; ++i)
607 STORE_LE(inode->i_block[i], i + n); // use next block
608 //bb_info_msg("LAST BLOCK USED[%u]", i + n);
609 PUT(((uint64_t)FETCH_LE32(gd[0].bg_inode_table) * blocksize) + (EXT2_GOOD_OLD_FIRST_INO-1) * inodesize,
613 memset(buf, 0, blocksize);
614 dir = (struct ext2_dir *)buf;
616 // dump 2nd+ blocks of "/lost+found"
617 STORE_LE(dir->rec_len1, blocksize); // e2fsck 1.41.4 compat (1.41.9 does not need this)
618 for (i = 1; i < lost_and_found_blocks; ++i)
619 PUT((uint64_t)(FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks + 1+i) * blocksize,
622 // dump 1st block of "/lost+found"
623 STORE_LE(dir->inode1, EXT2_GOOD_OLD_FIRST_INO);
624 STORE_LE(dir->rec_len1, 12);
625 STORE_LE(dir->name_len1, 1);
626 STORE_LE(dir->file_type1, EXT2_FT_DIR);
628 STORE_LE(dir->inode2, EXT2_ROOT_INO);
629 STORE_LE(dir->rec_len2, blocksize - 12);
630 STORE_LE(dir->name_len2, 2);
631 STORE_LE(dir->file_type2, EXT2_FT_DIR);
632 dir->name2[0] = '.'; dir->name2[1] = '.';
633 PUT((uint64_t)(FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks + 1) * blocksize, buf, blocksize);
635 // dump root dir block
636 STORE_LE(dir->inode1, EXT2_ROOT_INO);
637 STORE_LE(dir->rec_len2, 12);
638 STORE_LE(dir->inode3, EXT2_GOOD_OLD_FIRST_INO);
639 STORE_LE(dir->rec_len3, blocksize - 12 - 12);
640 STORE_LE(dir->name_len3, 10);
641 STORE_LE(dir->file_type3, EXT2_FT_DIR);
642 strcpy(dir->name3, "lost+found");
643 PUT((uint64_t)(FETCH_LE32(gd[0].bg_inode_table) + inode_table_blocks + 0) * blocksize, buf, blocksize);
646 if (ENABLE_FEATURE_CLEAN_UP) {