toybox: toys/mke2fs.c annotate

annotate toys/mke2fs.c @ 79:1aff4181427b

Filling out most of the ext2 superblock correctly now.

author	Rob Landley <rob@landley.net>
date	Fri, 26 Jan 2007 10:48:35 -0500
parents	e6332139adae
children	7a058d60faf1

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
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	10 #define TT toy.mke2fs
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	11
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	12 // 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	13 // 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	14 // 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	15 // 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	16 // 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	17 // 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	18 // 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	19
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	20 // 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	21 // 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	22 // 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	23
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	24 // 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	25 // 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	26 // 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	27
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	28 // 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	29 // 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	30
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	31
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	32 // 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	33 // 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	34 // 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	35 // 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	36 //
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	37 // 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	38 // 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	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 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	41 {
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	42 // 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	43 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	44 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	45 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	46
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	47 // 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	48 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	49 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	50
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	51 // 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	52 // 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	53 // 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	54 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	55 }
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 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	58 {
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	59 struct ext2_superblock *sb = xzalloc(sizeof(struct ext2_superblock));
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	60 uint32_t temp;
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	61 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	62
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	63 // 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	64
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	65 if (toys.optargs[1]) {
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	66 sscanf(toys.optargs[1], "%u", &TT.blocks);
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	67 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	68 } else temp = O_RDWR;
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	69
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	70 // TODO: Check if filesystem is mounted here
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	71
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	72 // For mke?fs, open file. For gene?fs, create file.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	73 length = fdlength(TT.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	74
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	75 // TODO: collect gene2fs list, calculate requirements.
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
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	77 // 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	78
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	79 // Determine appropriate block size, set log_block_size and log_frag_size.
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	80
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	81 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	82 if (TT.blocksize == 1024) temp = 0;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	83 else if (TT.blocksize == 2048) temp = 1;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	84 else if (TT.blocksize == 4096) temp = 2;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	85 else error_exit("bad blocksize");
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	86 sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	87
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	88 // Fill out blocks_count and r_blocks_count
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	89
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	90 if (!TT.blocks) TT.blocks = length/TT.blocksize;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	91 sb->blocks_count = SWAP_LE32(TT.blocks);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	92
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	93 if (!TT.reserved_percent) TT.reserved_percent = 5;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	94 temp = (TT.blocks * (uint64_t)TT.reserved_percent) /100;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	95 sb->r_blocks_count = SWAP_LE32(temp);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	96
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	97 // Set blocks_per_group and frags_per_group, which is the size of an
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	98 // allocation bitmap that fits in one block (I.E. how many bits per block)?
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	99
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	100 temp = TT.blocksize*8;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	101 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(temp);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	102
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	103 // How many block groups do we need? (Round up avoiding integer overflow.)
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	104
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	105 TT.groups = (TT.blocks)/temp;
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	106 if (TT.blocks & (temp-1)) TT.groups++;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	107
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	108 // Figure out how many inodes we need.
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	109
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	110 if (!TT.inodes) {
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	111 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	112 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	113 }
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	114
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	115 // Figure out inodes per group, rounded up to block size.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	116
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	117 // How many blocks of inodes total, rounded up
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	118 temp = TT.inodes / (TT.blocksize/sizeof(struct ext2_inode));
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	119 if (TT.inodes & (TT.blocksize-1)) temp++;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	120 // How many blocks of inodes per group, again rounded up
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	121 TT.inodes = temp / TT.groups;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	122 if (temp & (TT.groups-1)) TT.inodes++;
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	123 // How many inodes per group is that?
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	124 TT.inodes *= (TT.blocksize/sizeof(struct ext2_inode));
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	125
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	126 // Set inodes_per_group and total inodes_count
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	127 sb->inodes_per_group = SWAP_LE32(TT.inodes);
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	128 sb->inodes_count = SWAP_LE32(TT.inodes *= TT.groups);
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	129
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	130 // Fill out the rest of the superblock.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	131 sb->max_mnt_count=0xFFFF;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	132 sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL));
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	133 sb->magic = SWAP_LE32(0xEF53);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	134 sb->state = sb->errors = SWAP_LE16(1);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	135
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	136 sb->rev_level = SWAP_LE32(1);
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	137 sb->inode_size = sizeof(struct ext2_inode);
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	138 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	139 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	140
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	141 create_uuid(sb->uuid);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	142
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	143 // 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	144
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	145 //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	146 // 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	147
89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	148 // 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	149 // figure out if this file is seekable.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	150 if(-1 == lseek(TT.fsfd, 1024, SEEK_SET)) perror_exit("lseek");
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	151 //{ TT.noseek=1; xwrite(TT.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	152
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	153 // Write superblock to disk.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	154 xwrite(TT.fsfd, sb, sizeof(struct ext2_superblock)); // 4096-1024
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	155
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	156 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	157 }

Mercurial > hg > toybox

annotate toys/mke2fs.c @ 79:1aff4181427b