toybox: toys/mke2fs.c annotate

annotate toys/mke2fs.c @ 104:1c2f6d2e25de

Precalculate block and inode usage given a starting file tree. This compiles, probably doesn't actually work yet.

author	Rob Landley <rob@landley.net>
date	Sun, 18 Feb 2007 16:24:55 -0500
parents	ff85a83e7d7e
children	c5b6fb1fe3a4

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
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	31 #define INODES_RESERVED 10
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	32
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	33 // Calculate data blocks plus index blocks needed to hold a file.
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	34
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	35 static uint32_t count_blocks_used(uint64_t size)
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	36 {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	37 uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize);
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	38 uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	39
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	40 // Account for direct, singly, doubly, and triply indirect index blocks
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	41
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	42 if (dblocks > 12) {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	43 iblocks = ((dblocks-13)/idx)+1;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	44 if (iblocks > 1) {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	45 diblocks = ((iblocks-2)/idx)+1;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	46 if (diblocks > 1)
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	47 tiblocks = ((diblocks-2)/idx)+1;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	48 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	49 }
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	50
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	51 return dblocks + iblocks + diblocks + tiblocks;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	52 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	53
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	54 // Calculate the number of blocks used by each inode. Returns blocks used,
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	55 // assigns bytes used to *size. Writes total block count to TT.treeblocks
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	56 // and inode count to TT.treeinodes.
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	57
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	58 static long check_treesize(struct dirtree this, off_t size)
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	59 {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	60 long blocks;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	61
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	62 while (this) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	63 *size += sizeof(struct ext2_dentry) + strlen(this->name);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	64
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	65 if (this->child)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	66 this->st.st_blocks = check_treesize(this->child, &this->st.st_size);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	67 else if (S_ISREG(this->st.st_mode)) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	68 this->st.st_blocks = count_blocks_used(this->st.st_size);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	69 TT.treeblocks += this->st.st_blocks;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	70 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	71 this = this->next;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	72 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	73 TT.treeblocks += blocks = count_blocks_used(*size);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	74 TT.treeinodes++;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	75
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	76 return blocks;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	77 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	78
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	79 // Use the parent pointer to iterate through the tree non-recursively.
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	80 static struct dirtree treenext(struct dirtree this)
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	81 {
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	82 while (this && !this->next) this = this->parent;
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	83 if (this) this = this->next;
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	84
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	85 return this;
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	86 }
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	87
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	88 // To do this right I need to copy the tree and sort it, but here's a really
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	89 // ugly n^2 way of dealing with the problem that doesn't scale well to large
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	90 // numbers of files but can be done in very little code.
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	91
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	92 static void check_treelinks(void)
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	93 {
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	94 struct dirtree this, that;
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	95
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	96 for (this = TT.dt; this; this = treenext(this)) {
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	97 // Since we can't hardlink to directories, we know their link count.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	98 if (S_ISDIR(this->st.st_mode)) this->st.st_nlink = 2;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	99 else {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	100 this->st.st_nlink = 0;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	101 for (that = TT.dt; that; that = treenext(that))
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	102 if (this->st.st_ino == that->st.st_ino)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	103 if (this->st.st_dev == that->st.st_dev)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	104 this->st.st_nlink++;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	105 }
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	106 }
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	107 }
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	108
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	109 // 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	110 // 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	111 // 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	112 // 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	113 //
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	114 // 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	115 // 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	116
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	117 static void create_uuid(char *uuid)
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	118 {
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	119 // Read 128 random bits
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	120 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	121 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	122 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	123
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	124 // 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	125 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	126 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	127
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	128 // 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	129 // 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	130 // 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	131 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	132 }
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	133
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	134 // Figure out inodes per group, rounded up to fill complete inode blocks.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	135 static uint32_t get_inodespg(uint32_t inodes)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	136 {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	137 uint32_t temp;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	138
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	139 temp = (inodes + TT.groups - 1) / TT.groups;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	140 inodes = TT.blocksize/sizeof(struct ext2_inode);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	141 return ((temp + inodes - 1)/inodes)*inodes;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	142 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	143
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	144 // Fill out superblock and TT
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	145
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	146 static void init_superblock(struct ext2_superblock *sb)
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	147 {
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	148 uint32_t temp;
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	149
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	150 // Set log_block_size and log_frag_size.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	151
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	152 for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	153 if (temp==4) error_exit("bad blocksize");
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	154 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	155
80 7a058d60faf1 One more field, minor shrinking, and start on block groups. Rob Landley <rob@landley.net> parents: 79 diff changeset	156 // Fill out blocks_count, r_blocks_count, first_data_block
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	157
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	158 sb->blocks_count = SWAP_LE32(TT.blocks);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	159 temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	160 sb->r_blocks_count = SWAP_LE32(temp);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	161
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	162 sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0);
80 7a058d60faf1 One more field, minor shrinking, and start on block groups. Rob Landley <rob@landley.net> parents: 79 diff changeset	163
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	164 // 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	165 // 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	166
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	167 sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits);
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	168
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	169 // 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	170
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	171 TT.groups = (TT.blocks)/TT.blockbits;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	172 if (TT.blocks & (TT.blockbits-1)) TT.groups++;
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	173
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	174 // 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	175
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	176 TT.inodespg = get_inodespg(TT.inodespg);
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	177
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	178 // Set inodes_per_group and total inodes_count
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	179 sb->inodes_per_group = SWAP_LE32(TT.inodespg);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	180 sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups);
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	181
1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	182 // Fill out the rest of the superblock.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	183 sb->max_mnt_count=0xFFFF;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	184 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	185 sb->magic = SWAP_LE32(0xEF53);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	186 sb->state = sb->errors = SWAP_LE16(1);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	187
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	188 sb->rev_level = SWAP_LE32(1);
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	189 sb->first_ino = SWAP_LE32(INODES_RESERVED+1);
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	190 sb->inode_size = SWAP_LE16(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	191 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	192 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	193
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	194 create_uuid(sb->uuid);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	195
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	196 // TODO If we're called as mke3fs or mkfs.ext3, do a journal.
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	197
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	198 //if (strchr(toys.which->name,'3'))
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	199 // sb->feature_compat \|= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL);
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	200 }
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	201
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	202 // Does this group contain a superblock backup (and group descriptor table)?
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	203 static int is_sb_group(uint32_t group)
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	204 {
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	205 int i;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	206
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	207 // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7.
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	208 if(!group \|\| group==1) return 1;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	209 for (i=3; i<9; i+=2) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	210 int j = i;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	211 while (j<group) j*=i;
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	212 if (j==group) return 1;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	213 }
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	214 return 0;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	215 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	216
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	217
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	218 // Number of blocks used in this group by superblock/group list backup.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	219 static int group_superblock_used(uint32_t group)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	220 {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	221 int used;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	222
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	223 if (!is_sb_group(group)) return 0;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	224
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	225 // How blocks does the group table take up?
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	226 used = TT.groups * sizeof(struct ext2_group);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	227 used += TT.blocksize - 1;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	228 used /= TT.blocksize;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	229 // Plus the superblock itself.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	230 used++;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	231 // And a corner case.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	232 if (!group && TT.blocksize == 1024) used++;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	233
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	234 return used;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	235 }
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	236
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	237 static uint32_t get_all_group_blocks(void)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	238 {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	239 uint32_t i, blocks, inodeblks;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	240
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	241 inodeblks = get_inodespg(TT.inodespg);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	242 inodeblks /= TT.blocksize/sizeof(struct ext2_inode);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	243 for (i = blocks = 0; i<TT.groups; i++)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	244 blocks += group_superblock_used(i) + 2 + inodeblks;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	245
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	246 return blocks;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	247 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	248
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	249 static void bits_set(char *array, int start, int len)
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	250 {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	251 while(len) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	252 if ((start&7) \|\| len<8) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	253 array[start/8]\|=(1<<(start&7));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	254 start++;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	255 len--;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	256 } else {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	257 array[start/8]=255;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	258 start+=8;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	259 len-=8;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	260 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	261 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	262 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	263
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	264 // Seek past len bytes (to maintain sparse file), or write zeroes if output
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	265 // not seekable
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	266 static void put_zeroes(int len)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	267 {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	268 if(TT.noseek \|\| -1 == lseek(TT.fsfd, len, SEEK_SET)) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	269
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	270 TT.noseek=1;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	271 memset(toybuf, 0, sizeof(toybuf));
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	272 while (len) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	273 int out = len > sizeof(toybuf) ? sizeof(toybuf) : len;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	274 xwrite(TT.fsfd, toybuf, out);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	275 len -= out;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	276 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	277 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	278 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	279
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	280 static void fill_inode(struct ext2_inode in, struct dirtree this)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	281 {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	282 memset(in,0,sizeof(struct ext2_inode));
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	283
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	284 // This works on Linux. S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	285 in->mode = this->st.st_mode;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	286
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	287 in->uid = this->st.st_uid & 0xFFFF;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	288 in->uid_high = this->st.st_uid >> 16;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	289 in->gid = this->st.st_gid & 0xFFFF;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	290 in->gid_high = this->st.st_gid >> 16;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	291 in->size = this->st.st_size & 0xFFFFFFFF;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	292
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	293 in->atime = this->st.st_atime;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	294 in->ctime = this->st.st_ctime;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	295 in->mtime = this->st.st_mtime;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	296
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	297 in->links_count = this->st.st_nlink;
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	298 in->blocks = this->st.st_blocks;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	299 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	300
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	301 int mke2fs_main(void)
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	302 {
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	303 int i, temp;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	304 off_t length;
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	305
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	306 // Handle command line arguments.
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	307
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	308 if (toys.optargs[1]) {
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	309 sscanf(toys.optargs[1], "%u", &TT.blocks);
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	310 temp = O_RDWR\|O_CREAT;
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	311 } else temp = O_RDWR;
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	312 if (!TT.reserved_percent) TT.reserved_percent = 5;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	313
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	314 // TODO: Check if filesystem is mounted here
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	315
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	316 // For mke?fs, open file. For gene?fs, create file.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	317 TT.fsfd = xcreate(*toys.optargs, temp, 0777);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	318
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	319 // Determine appropriate block size and block count from file length.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	320 // (If no length, default to 4k. They can override it on the cmdline.)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	321
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	322 length = fdlength(TT.fsfd);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	323 if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	324 TT.blockbits = 8*TT.blocksize;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	325 if (!TT.blocks) TT.blocks = length/TT.blocksize;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	326
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	327 // Figure out how many total inodes we need.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	328
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	329 if (!TT.inodespg) {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	330 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	331 TT.inodespg = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	332 }
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	333
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	334 // Collect gene2fs list or lost+found, calculate requirements.
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	335
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	336 if (TT.gendir) {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	337 strncpy(toybuf, TT.gendir, sizeof(toybuf));
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	338 TT.dt = read_dirtree(toybuf, NULL);
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	339 } else {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	340 TT.dt = xzalloc(sizeof(struct dirtree)+11);
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	341 strcpy(TT.dt->name, "lost+found");
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	342 TT.dt->st.st_mode = S_IFDIR\|0755;
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	343 TT.dt->st.st_ctime = TT.dt->st.st_mtime = time(NULL);
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	344 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	345
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	346 // Figure out how much space is used by preset files
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	347 length = 0;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	348 length = check_treesize(TT.dt, &length);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	349 check_treelinks(); // Calculate st_nlink for each node in tree.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	350
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	351 if (TT.gendir && !TT.blocks) {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	352 // Figure out how many blocks of overhead superblock backups and
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	353 // group descriptor tables impose. Start with a minimal guess,
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	354 // find the overhead for that many groups, and loop until this
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	355 // is enough groups to store this many blocks.
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	356 TT.groups = (TT.treeblocks/TT.blockbits)+1;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	357 for (;;) {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	358 TT.blocks = TT.treeblocks + get_all_group_blocks();
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	359 if (TT.blocks <= TT.groups * TT.blockbits) break;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	360 TT.groups++;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	361 }
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	362 }
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	363
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	364 // TT.blocks is now big enough to initialize superblock structure
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	365
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	366 init_superblock(&TT.sb);
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	367 temp = get_all_group_blocks();
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	368 if (TT.blocks < TT.treeblocks + temp) error_exit("Not enough space.\n");
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	369
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	370 TT.sb.free_blocks_count = SWAP_LE32(TT.blocks - TT.treeblocks - temp);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	371 TT.sb.free_inodes_count = SWAP_LE32(TT.inodespg*TT.groups - INODES_RESERVED
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	372 - TT.treeinodes);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	373
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	374 // Skip the first 1k to avoid the boot sector (if any)
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	375 put_zeroes(1024);
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	376
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	377 // Loop through block groups, write out each one.
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	378 for (i=0; i<TT.groups; i++) {
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	379 struct ext2_inode in = (struct ext2_inode )toybuf;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	380 uint32_t start, itable, used, end;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	381 int j, slot;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	382
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	383 // Where does this group end?
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	384 end = TT.blockbits;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	385 if ((i+1)*TT.blockbits > TT.blocks) end = TT.blocks & (TT.blockbits-1);
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	386
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	387 // Blocks used by inode table
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	388 itable = (TT.inodespg*sizeof(struct ext2_inode))/TT.blocksize;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	389
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	390 // If a superblock goes here, write it out.
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	391 start = group_superblock_used(i);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	392 if (start) {
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	393 struct ext2_group bg = (struct ext2_group )toybuf;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	394
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	395 TT.sb.block_group_nr = SWAP_LE16(i);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	396
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	397 // Write superblock and pad it up to block size
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	398 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	399 temp = TT.blocksize - sizeof(struct ext2_superblock);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	400 if (!i && TT.blocksize > 1024) temp -= 1024;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	401 memset(toybuf, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	402 xwrite(TT.fsfd, toybuf, temp);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	403
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	404 // Loop through groups to write group descriptor table.
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	405 for(j=0; j<TT.groups; j++) {
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	406
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	407 // Figure out what sector this group starts in.
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	408 used = group_superblock_used(j);
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	409
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	410 // Find next array slot in this block (flush block if full).
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	411 slot = j % (TT.blocksize/sizeof(struct ext2_group));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	412 if (!slot) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	413 if (j) xwrite(TT.fsfd, bg, TT.blocksize);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	414 memset(bg, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	415 }
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	416
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	417 // How many free inodes in this group? (TODO)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	418 temp = TT.inodespg;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	419 if (!i) temp -= INODES_RESERVED;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	420 bg[slot].free_inodes_count = SWAP_LE16(temp);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	421
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	422 // How many free blocks in this group? (TODO)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	423 temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2;
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	424 temp = end-used-temp;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	425 bg[slot].free_blocks_count = SWAP_LE32(temp);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	426
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	427 // Fill out rest of group structure (TODO: gene2fs allocation)
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	428 used += j*TT.blockbits;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	429 bg[slot].block_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	430 bg[slot].inode_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	431 bg[slot].inode_table = SWAP_LE32(used);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	432 bg[slot].used_dirs_count = 0; // (TODO)
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	433 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	434 xwrite(TT.fsfd, bg, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	435 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	436
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	437 // Now write out stuff that every block group has.
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	438
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	439 // Write block usage bitmap (TODO: fill it)
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	440
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	441 memset(toybuf, 0, TT.blocksize);
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	442 bits_set(toybuf, 0, start+itable);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	443 if (end!=TT.blockbits) bits_set(toybuf, end, TT.blockbits-end);
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	444 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	445
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	446 // Write inode bitmap (TODO)
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	447 memset(toybuf, 0, TT.blocksize);
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	448 if (!i) bits_set(toybuf, 0, INODES_RESERVED);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	449 bits_set(toybuf, TT.inodespg, TT.blockbits-TT.inodespg);
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	450 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	451
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	452 start += 3;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	453
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	454 // Write inode table for this group
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	455 for (j = 0; j<TT.inodespg; j++) {
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	456 slot = j % (TT.blocksize/sizeof(struct ext2_inode));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	457 if (!slot) {
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	458 if (j) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	459 xwrite(TT.fsfd, in, TT.blocksize);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	460 start++;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	461 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	462 memset(in, 0, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	463 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	464 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	465 xwrite(TT.fsfd, in, TT.blocksize);
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	466
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	467 // Write empty data blocks
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	468 put_zeroes((end-start) * TT.blocksize);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	469 }
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	470
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	471 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	472 }

Mercurial > hg > toybox

annotate toys/mke2fs.c @ 104:1c2f6d2e25de