Mercurial > hg > toybox

annotate toys/mke2fs.c @ 75:89ca591a9236

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
More random progress on mke2fs. Nothing to see yet.
author Rob Landley <rob@landley.net>
date Tue, 23 Jan 2007 13:20:38 -0500
parents 41d55b5d49fd
children e6332139adae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
1 /* vi: set ts=4:
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
2 *
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
3 * mke2fs.c - Create an ext2 filesystem image.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
4 *
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
5 * Copyright 2006 Rob Landley <rob@landley.net>
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
6 */
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
7
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
8 #include "toys.h"
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
9
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
10 // b - block size (1024, 2048, 4096)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
11 // F - force (run on mounted device or non-block device)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
12 // i - bytes per inode
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
13 // N - number of inodes
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
14 // m - reserved blocks percentage
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
15 // n - Don't write
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
16 // q - quiet
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
17
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
18 // L - volume label
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
19 // M - last mounted path
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
20 // o - creator os
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
21
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
22 // j - create journal
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
23 // J - journal options (size=1024-102400 blocks,device=)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
24 // device=/dev/blah or LABEL=label UUID=uuid
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
25
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
26 // E - extended options (stride=stripe-size blocks)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
27 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
28
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
29
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
30 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
31 // we should generate a uuid structure by reading a clock with 100 nanosecond
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
32 // precision, normalizing it to the start of the gregorian calendar in 1582,
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
33 // and looking up our eth0 mac address.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
34 //
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
35 // On the other hand, we have 128 bits to come up with a unique identifier, of
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
36 // which 6 have a defined value. /dev/urandom it is.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
37
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
38 void create_uuid(char *uuid)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
39 {
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
40 // Read 128 random bytes
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
41 int fd = xopen("/dev/urandom", O_RDONLY);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
42 xreadall(fd, uuid, 16);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
43 close(fd);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
44
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
45 // Claim to be a DCE format UUID.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
46 uuid[6] = (uuid[6] & 0x0F) | 0x40;
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
47 uuid[8] = (uuid[8] & 0x3F) | 0x80;
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
48
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
49 // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
50 // set bit 1 of the node ID, which is the mac multicast bit. This means we
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
51 // should never collide with anybody actually using a macaddr.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
52 uuid[11] = uuid[11] | 128;
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
53 }
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
54
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
55 int mke2fs_main(void)
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
56 {
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
57 struct ext2_super_block *sb = xzalloc(sizeof(struct ext2_super_block));
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
58 int temp;
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
59 off_t length;
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
60
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
61 // Handle command line arguments.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
62
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
63 if (toys.optargs[1]) {
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
64 sscanf(toys.optargs[1], "%u", &(sb->inodes_count));
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
65 temp = O_RDWR|O_CREAT;
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
66 } else temp = O_RDWR;
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
67
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
68 // Check if filesystem is mounted
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
69
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
70 // For mke?fs, open file. For gene?fs, create file.
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
71 length = fdlength(toy.mke2fs.fsfd = xcreate(*toys.optargs, temp, 0777));
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
72
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
73 if (toy.mke2fs.blocksize && toy.mke2fs.blocksize!=1024
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
74 && toy.mke2fs.blocksize!=2048 && toy.mke2fs.blocksize!=4096)
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
75 error_exit("bad blocksize");
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
76
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
77 // Determine block size. If unspecified, use simple heuristic.
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
78 if (toy.mke2fs.blocksize)
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
79 sb->log_block_size = (length && length < 1<<24) ? 1024 : 4096;
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
80 else sb->log_block_size = toy.mke2fs.blocksize;
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
81
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
82 if (!sb->inodes_count) sb->inodes_count = length/toy.mke2fs.blocksize;
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
83
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
84 // Fill out superblock structure
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
85
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
86 sb->rev_level = SWAP_LE32(1);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
87 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
88 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
89
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
90 // If we're called as mke3fs or mkfs.ext3, do a journal.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
91
75
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
92 //if (strchr(toys.which->name,'3'))
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
93 // sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
94
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
95 // We skip the first 1k (to avoid the boot sector, if any). Use this to
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
96 // figure out if this file is seekable.
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
97 if(-1 == lseek(toy.mke2fs.fsfd, 1024, SEEK_SET)) perror_exit("lseek");
89ca591a9236 More random progress on mke2fs. Nothing to see yet.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
98 //{ toy.mke2fs.noseek=1; xwrite(toy.mke2fs.fsfd, sb, 1024); }
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
99
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
100 // Write superblock to disk.
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
101 xwrite(toy.mke2fs.fsfd, sb, 3072); // 4096-1024
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
102
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
103 return 0;
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
diff changeset
104 }