1 /* vi: set sw=4 ts=4: */
3 * mkfs_reiser: utility to create ReiserFS filesystem
5 * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
12 char BUG_wrong_field_size(void);
13 #define STORE_LE(field, value) \
15 if (sizeof(field) == 4) \
16 field = SWAP_LE32(value); \
17 else if (sizeof(field) == 2) \
18 field = SWAP_LE16(value); \
19 else if (sizeof(field) == 1) \
22 BUG_wrong_field_size(); \
25 #define FETCH_LE32(field) \
26 (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
28 struct journal_params
{
29 uint32_t jp_journal_1st_block
; /* where does journal start from on its device */
30 uint32_t jp_journal_dev
; /* journal device st_rdev */
31 uint32_t jp_journal_size
; /* size of the journal on FS creation. used to make sure they don't overflow it */
32 uint32_t jp_journal_trans_max
; /* max number of blocks in a transaction. */
33 uint32_t jp_journal_magic
; /* random value made on fs creation (this was sb_journal_block_count) */
34 uint32_t jp_journal_max_batch
; /* max number of blocks to batch into a trans */
35 uint32_t jp_journal_max_commit_age
; /* in seconds, how old can an async commit be */
36 uint32_t jp_journal_max_trans_age
; /* in seconds, how old can a transaction be */
39 struct reiserfs_journal_header
{
40 uint32_t jh_last_flush_trans_id
; /* id of last fully flushed transaction */
41 uint32_t jh_first_unflushed_offset
; /* offset in the log of where to start replay after a crash */
43 struct journal_params jh_journal
;
44 uint32_t jh_last_check_mount_id
; /* the mount id of the fs during the last reiserfsck --check. */
47 struct reiserfs_super_block
{
48 uint32_t sb_block_count
; /* 0 number of block on data device */
49 uint32_t sb_free_blocks
; /* 4 free blocks count */
50 uint32_t sb_root_block
; /* 8 root of the tree */
52 struct journal_params sb_journal
; /* 12 */
54 uint16_t sb_blocksize
; /* 44 */
55 uint16_t sb_oid_maxsize
; /* 46 max size of object id array, see get_objectid() commentary */
56 uint16_t sb_oid_cursize
; /* 48 current size of object id array */
57 uint16_t sb_umount_state
; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */
59 char s_magic
[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
60 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) */
61 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 */
62 uint16_t sb_tree_height
; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */
63 uint16_t sb_bmap_nr
; /* 70 amount of bitmap blocks needed to address each block of file system */
64 uint16_t sb_version
; /* 72 this field is only reliable on filesystem with non-standard journal */
65 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 */
66 uint32_t sb_inode_generation
; /* 76 */
67 uint32_t sb_flags
; /* 80 Right now used only by inode-attributes, if enabled */
68 unsigned char s_uuid
[16]; /* 84 filesystem unique identifier */
69 unsigned char s_label
[16]; /* 100 filesystem volume label */
70 uint16_t sb_mnt_count
; /* 116 */
71 uint16_t sb_max_mnt_count
; /* 118 */
72 uint32_t sb_lastcheck
; /* 120 */
73 uint32_t sb_check_interval
; /* 124 */
74 /* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */
75 char s_unused
[76]; /* 128 */
79 /* Header of a disk block. More precisely, header of a formatted leaf
80 or internal node, and not the header of an unformatted node. */
82 uint16_t blk2_level
; /* Level of a block in the tree. */
83 uint16_t blk2_nr_item
; /* Number of keys/items in a block. */
84 uint16_t blk2_free_space
; /* Block free space in bytes. */
85 uint16_t blk_reserved
;
89 #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
91 #define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs"
92 #define REISERFS_FORMAT_3_6 2
93 #define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */
94 #define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */
96 #define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */
98 #define JOURNAL_MIN_SIZE 512
99 /* biggest possible single transaction, don't change for now (8/3/99) */
100 #define JOURNAL_TRANS_MAX 1024
101 #define JOURNAL_TRANS_MIN 256 /* need to check whether it works */
102 #define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */
103 #define JOURNAL_MIN_RATIO 2
104 /* max blocks to batch into one transaction, don't make this any bigger than 900 */
105 #define JOURNAL_MAX_BATCH 900
106 #define JOURNAL_MAX_COMMIT_AGE 30
109 // Standard mkreiserfs 3.6.21:
110 // -b | --block-size N size of file-system block, in bytes
111 // -j | --journal-device FILE path to separate device to hold journal
112 // -s | --journal-size N size of the journal in blocks
113 // -o | --journal-offset N offset of the journal from the start of
114 // the separate device, in blocks
115 // -t | --transaction-max-size N maximal size of transaction, in blocks
116 // -B | --badblocks file store all bad blocks given in file on the fs
117 // -h | --hash rupasov|tea|r5 hash function to use by default
118 // -u | --uuid UUID store UUID in the superblock
119 // -l | --label LABEL store LABEL in the superblock
120 // --format 3.5|3.6 old 3.5 format or newer 3.6
121 // -f | --force specified once, make mkreiserfs the whole
122 // disk, not block device or mounted partition;
123 // specified twice, do not ask for confirmation
124 // -q | --quiet quiet work without messages, progress and
125 // questions. Useful if run in a script. For use
126 // by end users only.
127 // -d | --debug print debugging information during mkreiser
128 // -V print version and exit
130 // Options not commented below are taken but silently ignored:
140 OPT_l
= 1 << 8, // label
141 OPT_f
= 1 << 9, // ask no questions
144 //OPT_V = 1 << 12, // -V version. bbox applets don't support that
147 int mkfs_reiser_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
148 int mkfs_reiser_main(int argc UNUSED_PARAM
, char **argv
)
150 unsigned blocksize
= 4096;
151 unsigned journal_blocks
= 8192;
152 unsigned blocks
, bitmap_blocks
, i
, block
;
154 const char *label
= "";
158 struct reiserfs_super_block
*sb
;
159 struct journal_params
*jp
;
160 struct block_head
*root
;
162 // using global "option_mask32" instead of local "opts":
163 // we are register starved here
164 opt_complementary
= "-1:b+";
165 /*opts =*/ getopt32(argv
, "b:j:s:o:t:B:h:u:l:fqd",
166 NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, &label
);
167 argv
+= optind
; // argv[0] -- device
169 // check the device is a block device
170 fd
= xopen(argv
[0], O_WRONLY
| O_EXCL
);
171 xfstat(fd
, &st
, argv
[0]);
172 if (!S_ISBLK(st
.st_mode
) && !(option_mask32
& OPT_f
))
173 bb_error_msg_and_die("%s: not a block device", argv
[0]);
175 // check if it is mounted
176 // N.B. what if we format a file? find_mount_point will return false negative since
177 // it is loop block device which is mounted!
178 if (find_mount_point(argv
[0], 0))
179 bb_error_msg_and_die("can't format mounted filesystem");
181 // open the device, get size in blocks
182 blocks
= get_volume_size_in_bytes(fd
, argv
[1], blocksize
, /*extend:*/ 1) / blocksize
;
184 // block number sanity check
185 // we have a limit: skipped area, super block, journal and root block
186 // all have to be addressed by one first bitmap
187 block
= REISERFS_DISK_OFFSET_IN_BYTES
/ blocksize
// boot area
190 + journal_blocks
+1 // journal
194 bitmap_blocks
= (blocks
- 1) / (blocksize
* 8) + 1;
195 i
= block
+ bitmap_blocks
;
198 if (MIN(blocksize
* 8, blocks
) < i
)
199 bb_error_msg_and_die("need >= %u blocks", i
);
204 // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device
205 // TODO: do we really need to wipe?!
206 xlseek(fd
, REISERFS_DISK_OFFSET_IN_BYTES
, SEEK_SET
);
209 sb
= (struct reiserfs_super_block
*)xzalloc(blocksize
);
211 STORE_LE(sb
->sb_block_count
, blocks
);
212 STORE_LE(sb
->sb_free_blocks
, blocks
- i
);
214 STORE_LE(sb
->sb_root_block
, block
);
215 // fill journal related fields
216 jp
= &sb
->sb_journal
;
217 STORE_LE(jp
->jp_journal_1st_block
, REISERFS_DISK_OFFSET_IN_BYTES
/ blocksize
+ 1/*sb*/ + 1/*bmp#0*/);
218 timestamp
= time(NULL
);
220 STORE_LE(jp
->jp_journal_magic
, random());
221 STORE_LE(jp
->jp_journal_size
, journal_blocks
);
222 STORE_LE(jp
->jp_journal_trans_max
, JOURNAL_TRANS_MAX
);
223 STORE_LE(jp
->jp_journal_max_batch
, JOURNAL_MAX_BATCH
);
224 STORE_LE(jp
->jp_journal_max_commit_age
, JOURNAL_MAX_COMMIT_AGE
);
226 STORE_LE(sb
->sb_blocksize
, blocksize
);
227 STORE_LE(sb
->sb_oid_maxsize
, (blocksize
- sizeof(*sb
)) / sizeof(uint32_t) / 2 * 2);
228 STORE_LE(sb
->sb_oid_cursize
, 2); // "." and ".."
229 strcpy(sb
->s_magic
, REISERFS_3_6_SUPER_MAGIC_STRING
);
230 STORE_LE(sb
->sb_bmap_nr
, (bitmap_blocks
> ((1LL << 16) - 1)) ? 0 : bitmap_blocks
);
232 STORE_LE(sb
->sb_version
, REISERFS_FORMAT_3_6
);
233 STORE_LE(sb
->sb_lastcheck
, timestamp
);
234 STORE_LE(sb
->sb_check_interval
, DEFAULT_CHECK_INTERVAL
);
235 STORE_LE(sb
->sb_mnt_count
, 1);
236 STORE_LE(sb
->sb_max_mnt_count
, DEFAULT_MAX_MNT_COUNT
);
237 STORE_LE(sb
->sb_umount_state
, FS_CLEANLY_UMOUNTED
);
238 STORE_LE(sb
->sb_tree_height
, 2);
239 STORE_LE(sb
->sb_hash_function_code
, 3); // R5_HASH
240 STORE_LE(sb
->sb_flags
, 1);
241 //STORE_LE(sb->sb_reserved_for_journal, 0);
243 generate_uuid(sb
->s_uuid
);
245 safe_strncpy((char *)sb
->s_label
, label
, sizeof(sb
->s_label
));
247 // TODO: EMPIRIC! ENDIANNESS!
248 // superblock has only 204 bytes. What are these?
254 xwrite(fd
, sb
, blocksize
);
257 buf
= xzalloc(blocksize
);
259 // bitmap #0 uses initial "block"+1 blocks
261 memset(buf
, 0xFF, i
/ 8);
262 buf
[i
/ 8] = (1 << (i
& 7)) - 1; //0..7 => 00000000..01111111
263 // mark trailing absent blocks, if any
264 if (blocks
< 8*blocksize
) {
265 unsigned n
= 8*blocksize
- blocks
;
267 buf
[blocksize
- i
- 1] |= 0x7F00 >> (n
& 7); //0..7 => 00000000..11111110
268 memset(buf
+ blocksize
- i
, 0xFF, i
); // N.B. no overflow here!
271 xwrite(fd
, buf
, blocksize
);
273 // now go journal blocks
274 memset(buf
, 0, blocksize
);
275 for (i
= 0; i
< journal_blocks
; i
++)
276 xwrite(fd
, buf
, blocksize
);
277 // dump journal control block
278 memcpy(&((struct reiserfs_journal_header
*)buf
)->jh_journal
, &sb
->sb_journal
, sizeof(sb
->sb_journal
));
279 xwrite(fd
, buf
, blocksize
);
281 // other bitmaps are in every (8*blocksize)-th block
282 // N.B. they use the only block -- namely bitmap itself!
285 for (i
= 1; i
< bitmap_blocks
; i
++) {
286 xlseek(fd
, i
*8*blocksize
* blocksize
, SEEK_SET
);
287 // mark trailing absent blocks, if any
288 if (i
== bitmap_blocks
- 1 && (blocks
% (8*blocksize
))) {
289 unsigned n
= 8*blocksize
- blocks
% (8*blocksize
);
291 buf
[blocksize
- j
- 1] |= 0x7F00 >> (n
& 7); //0..7 => 00000000..11111110
292 memset(buf
+ blocksize
- j
, 0xFF, j
); // N.B. no overflow here!
294 xwrite(fd
, buf
, blocksize
);
299 memset(buf
, 0, blocksize
);
300 root
= (struct block_head
*)buf
;
301 STORE_LE(root
->blk2_level
, 1); // leaf node
302 STORE_LE(root
->blk2_nr_item
, 2); // "." and ".."
303 STORE_LE(root
->blk2_free_space
, blocksize
- sizeof(struct block_head
));
306 // TODO: EMPIRIC! ENDIANNESS!
307 // TODO: indented assignments seem to be timestamps
334 buf
[4036] = 056; buf
[4037] = 056; // ".."
335 buf
[4044] = 056; // "."
356 xlseek(fd
, block
* blocksize
, SEEK_SET
);
357 xwrite(fd
, buf
, blocksize
);
360 if (ENABLE_FEATURE_CLEAN_UP
) {