--- /dev/null
+/* vi: set sw=4 ts=4: */
+/*
+ * mkfs_reiser: utility to create ReiserFS filesystem
+ *
+ * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+#include "libbb.h"
+#include <linux/fs.h>
+#include "volume_id/volume_id_internal.h"
+
+char BUG_wrong_field_size(void);
+#define STORE_LE(field, value) \
+do { \
+ if (sizeof(field) == 4) \
+ field = cpu_to_le32(value); \
+ else if (sizeof(field) == 2) \
+ field = cpu_to_le16(value); \
+ else if (sizeof(field) == 1) \
+ field = (value); \
+ else \
+ BUG_wrong_field_size(); \
+} while (0)
+
+#define FETCH_LE32(field) \
+ (sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
+
+struct journal_params {
+ uint32_t jp_journal_1st_block; /* where does journal start from on its device */
+ uint32_t jp_journal_dev; /* journal device st_rdev */
+ uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */
+ uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */
+ uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */
+ uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */
+ uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */
+ uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */
+};
+
+struct reiserfs_journal_header {
+ uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */
+ uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
+ uint32_t jh_mount_id;
+ struct journal_params jh_journal;
+ uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */
+};
+
+struct reiserfs_super_block {
+ uint32_t sb_block_count; /* 0 number of block on data device */
+ uint32_t sb_free_blocks; /* 4 free blocks count */
+ uint32_t sb_root_block; /* 8 root of the tree */
+
+ struct journal_params sb_journal; /* 12 */
+
+ uint16_t sb_blocksize; /* 44 */
+ uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */
+ uint16_t sb_oid_cursize; /* 48 current size of object id array */
+ uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */
+
+ char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
+ uint16_t sb_fs_state; /* 62 it is set to used by fsck to mark which phase of rebuilding is done (used for fsck debugging) */
+ uint32_t sb_hash_function_code; /* 64 code of fuction which was/is/will be used to sort names in a directory. See codes in above */
+ uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */
+ uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */
+ uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */
+ uint16_t sb_reserved_for_journal; /* 74 size in blocks of journal area on main device, we need to keep after non-standard journal relocation */
+ uint32_t sb_inode_generation; /* 76 */
+ uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */
+ unsigned char s_uuid[16]; /* 84 filesystem unique identifier */
+ unsigned char s_label[16]; /* 100 filesystem volume label */
+ uint16_t sb_mnt_count; /* 116 */
+ uint16_t sb_max_mnt_count; /* 118 */
+ uint32_t sb_lastcheck; /* 120 */
+ uint32_t sb_check_interval; /* 124 */
+/* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */
+ char s_unused[76]; /* 128 */
+ /* 204 */
+};
+
+/* Header of a disk block. More precisely, header of a formatted leaf
+ or internal node, and not the header of an unformatted node. */
+struct block_head {
+ uint16_t blk2_level; /* Level of a block in the tree. */
+ uint16_t blk2_nr_item; /* Number of keys/items in a block. */
+ uint16_t blk2_free_space; /* Block free space in bytes. */
+ uint16_t blk_reserved;
+ uint32_t reserved[4];
+};
+
+#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
+
+#define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs"
+#define REISERFS_FORMAT_3_6 2
+#define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */
+#define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */
+
+#define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */
+
+#define JOURNAL_MIN_SIZE 512
+/* biggest possible single transaction, don't change for now (8/3/99) */
+#define JOURNAL_TRANS_MAX 1024
+#define JOURNAL_TRANS_MIN 256 /* need to check whether it works */
+#define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */
+#define JOURNAL_MIN_RATIO 2
+/* max blocks to batch into one transaction, don't make this any bigger than 900 */
+#define JOURNAL_MAX_BATCH 900
+#define JOURNAL_MAX_COMMIT_AGE 30
+
+
+// Standard mkreiserfs 3.6.21:
+// -b | --block-size N size of file-system block, in bytes
+// -j | --journal-device FILE path to separate device to hold journal
+// -s | --journal-size N size of the journal in blocks
+// -o | --journal-offset N offset of the journal from the start of
+// the separate device, in blocks
+// -t | --transaction-max-size N maximal size of transaction, in blocks
+// -B | --badblocks file store all bad blocks given in file on the fs
+// -h | --hash rupasov|tea|r5 hash function to use by default
+// -u | --uuid UUID store UUID in the superblock
+// -l | --label LABEL store LABEL in the superblock
+// --format 3.5|3.6 old 3.5 format or newer 3.6
+// -f | --force specified once, make mkreiserfs the whole
+// disk, not block device or mounted partition;
+// specified twice, do not ask for confirmation
+// -q | --quiet quiet work without messages, progress and
+// questions. Useful if run in a script. For use
+// by end users only.
+// -d | --debug print debugging information during mkreiser
+// -V print version and exit
+
+// Options not commented below are taken but silently ignored:
+enum {
+ OPT_b = 1 << 0,
+ OPT_j = 1 << 1,
+ OPT_s = 1 << 2,
+ OPT_o = 1 << 3,
+ OPT_t = 1 << 4,
+ OPT_B = 1 << 5,
+ OPT_h = 1 << 6,
+ OPT_u = 1 << 7,
+ OPT_l = 1 << 8, // label
+ OPT_f = 1 << 9, // ask no questions
+ OPT_q = 1 << 10,
+ OPT_d = 1 << 11,
+ //OPT_V = 1 << 12, // -V version. bbox applets don't support that
+};
+
+int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv)
+{
+ unsigned blocksize = 4096;
+ unsigned journal_blocks = 8192;
+ unsigned blocks, bitmap_blocks, i, block;
+ time_t timestamp;
+ const char *label = "";
+ struct stat st;
+ int fd;
+ uint8_t *buf;
+ struct reiserfs_super_block *sb;
+ struct journal_params *jp;
+ struct block_head *root;
+
+ // using global "option_mask32" instead of local "opts":
+ // we are register starved here
+ opt_complementary = "-1:b+";
+ /*opts =*/ getopt32(argv, "b:j:s:o:t:B:h:u:l:fqd",
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label);
+ argv += optind; // argv[0] -- device
+
+ // check the device is a block device
+ fd = xopen(argv[0], O_WRONLY | O_EXCL);
+ fstat(fd, &st);
+ 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!
+ if (find_mount_point(argv[0], 0))
+ bb_error_msg_and_die("can't format mounted filesystem");
+
+ // open the device, get size in blocks
+ if (argv[1]) {
+ blocks = xatoull(argv[1]);
+ // seek past end fails on block devices but works on files
+ if (lseek(fd, blocks * blocksize - 1, SEEK_SET) != (off_t)-1) {
+ xwrite(fd, "", 1); // file grows if needed
+ }
+ //else {
+ // bb_error_msg("warning, block device is smaller");
+ //}
+ } else {
+ blocks = (uoff_t)xlseek(fd, 0, SEEK_END) / blocksize;
+ }
+
+ // block number sanity check
+ // we have a limit: skipped area, super block, journal and root block
+ // all have to be addressed by one first bitmap
+ block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area
+ + 1 // sb
+ + 1 // bitmap#0
+ + journal_blocks+1 // journal
+ ;
+
+ // count overhead
+ bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1;
+ i = block + bitmap_blocks;
+
+ // check overhead
+ if (MIN(blocksize * 8, blocks) < i)
+ bb_error_msg_and_die("need >= %u blocks", i);
+
+ // ask confirmation?
+ // TODO: ???
+
+ // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device
+ // TODO: do we really need to wipe?!
+ xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET);
+
+ // fill superblock
+ sb = (struct reiserfs_super_block *)xzalloc(blocksize);
+ // block count
+ STORE_LE(sb->sb_block_count, blocks);
+ STORE_LE(sb->sb_free_blocks, blocks - i);
+ // TODO: decypher!
+ STORE_LE(sb->sb_root_block, block);
+ // fill journal related fields
+ jp = &sb->sb_journal;
+ STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/);
+ timestamp = time(NULL);
+ srandom(timestamp);
+ STORE_LE(jp->jp_journal_magic, random());
+ STORE_LE(jp->jp_journal_size, journal_blocks);
+ STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX);
+ STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH);
+ STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE);
+ // sizes
+ STORE_LE(sb->sb_blocksize, blocksize);
+ STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2);
+ STORE_LE(sb->sb_oid_cursize, 2); // "." and ".."
+ strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING);
+ STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks);
+ // misc
+ STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6);
+ STORE_LE(sb->sb_lastcheck, timestamp);
+ STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL);
+ STORE_LE(sb->sb_mnt_count, 1);
+ STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT);
+ STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED);
+ STORE_LE(sb->sb_tree_height, 2);
+ STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH
+ STORE_LE(sb->sb_flags, 1);
+ //STORE_LE(sb->sb_reserved_for_journal, 0);
+ // create UUID
+ generate_uuid(sb->s_uuid);
+ // write the label
+ safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label));
+
+ // TODO: EMPIRIC! ENDIANNESS!
+ // superblock has only 204 bytes. What are these?
+ buf = (uint8_t *)sb;
+ buf[205] = 1;
+ buf[209] = 3;
+
+ // put superblock
+ xwrite(fd, sb, blocksize);
+
+ // create bitmaps
+ buf = xzalloc(blocksize);
+
+ // bitmap #0 uses initial "block"+1 blocks
+ i = block + 1;
+ memset(buf, 0xFF, i / 8);
+ buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111
+ // mark trailing absent blocks, if any
+ if (blocks < 8*blocksize) {
+ unsigned n = 8*blocksize - blocks;
+ i = n / 8;
+ buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
+ memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here!
+ }
+ // put bitmap #0
+ xwrite(fd, buf, blocksize);
+
+ // now go journal blocks
+ memset(buf, 0, blocksize);
+ for (i = 0; i < journal_blocks; i++)
+ xwrite(fd, buf, blocksize);
+ // dump journal control block
+ memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal));
+ xwrite(fd, buf, blocksize);
+
+ // other bitmaps are in every (8*blocksize)-th block
+ // N.B. they use the only block -- namely bitmap itself!
+ buf[0] = 0x01;
+ // put bitmaps
+ for (i = 1; i < bitmap_blocks; i++) {
+ xlseek(fd, i*8*blocksize * blocksize, SEEK_SET);
+ // mark trailing absent blocks, if any
+ if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) {
+ unsigned n = 8*blocksize - blocks % (8*blocksize);
+ unsigned j = n / 8;
+ buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
+ memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here!
+ }
+ xwrite(fd, buf, blocksize);
+ }
+
+ // fill root block
+ // block head
+ memset(buf, 0, blocksize);
+ root = (struct block_head *)buf;
+ STORE_LE(root->blk2_level, 1); // leaf node
+ STORE_LE(root->blk2_nr_item, 2); // "." and ".."
+ STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head));
+ // item head
+ // root directory
+ // TODO: EMPIRIC! ENDIANNESS!
+ // TODO: indented assignments seem to be timestamps
+buf[4] = 0134;
+buf[24] = 01;
+buf[28] = 02;
+buf[42] = 054;
+buf[44] = 0324;
+buf[45] = 017;
+buf[46] = 01;
+buf[48] = 01;
+buf[52] = 02;
+buf[56] = 01;
+buf[60] = 0364;
+buf[61] = 01;
+buf[64] = 02;
+buf[66] = 060;
+buf[68] = 0244;
+buf[69] = 017;
+buf[4004] = 01;
+buf[4008] = 01;
+buf[4012] = 02;
+buf[4016] = 050;
+buf[4018] = 04;
+buf[4020] = 02;
+buf[4028] = 01;
+buf[4032] = 040;
+buf[4034] = 04;
+
+buf[4036] = 056; buf[4037] = 056; // ".."
+buf[4044] = 056; // "."
+
+buf[4052] = 0355;
+buf[4053] = 0101;
+buf[4056] = 03;
+buf[4060] = 060;
+ buf[4076] = 0173;
+ buf[4077] = 0240;
+ buf[4078] = 0344;
+ buf[4079] = 0112;
+ buf[4080] = 0173;
+ buf[4081] = 0240;
+ buf[4082] = 0344;
+ buf[4083] = 0112;
+ buf[4084] = 0173;
+ buf[4085] = 0240;
+ buf[4086] = 0344;
+ buf[4087] = 0112;
+buf[4088] = 01;
+
+ // put root block
+ xlseek(fd, block * blocksize, SEEK_SET);
+ xwrite(fd, buf, blocksize);
+
+ // cleanup
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(buf);
+ free(sb);
+ }
+
+ xclose(fd);
+ return EXIT_SUCCESS;
+}
projects / oweals / busybox.git / commitdiff