toybox: toys/mke2fs.c annotate

annotate toys/mke2fs.c @ 112:aadd28817955

Next iteration of mke2fs development.

author	Rob Landley <rob@landley.net>
date	Wed, 18 Apr 2007 21:39:46 -0400
parents	c5b6fb1fe3a4
children	9cbb323f297f

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
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	12 #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	13
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	14 static uint32_t div_round_up(uint32_t a, uint32_t b)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	15 {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	16 uint32_t c = a/b;
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	17
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	18 if (a%b) c++;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	19 return c;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	20 }
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	21
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	22 // 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	23
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	24 static uint32_t file_blocks_used(uint64_t size, uint32_t *blocklist)
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	25 {
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	26 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	27 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	28
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	29 // Fill out index blocks.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	30
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	31 if (blocklist) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	32 int i;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	33
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	34 for (i=0; i<13 && i<dblocks; i++) blocklist[i] = i;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	35 if (dblocks > 13+idx) blocklist[13] = 13+idx;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	36 idx = 13 + idx + (idx*idx);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	37 if (dblocks > idx) blocklist[14] = idx;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	38
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	39 return 0;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	40 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	41
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	42 // 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	43
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	44 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	45 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	46 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	47 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	48 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	49 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	50 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	51 }
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	52
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	53 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	54 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	55
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	56 // Use the parent pointer to iterate through the tree non-recursively.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	57 static struct dirtree treenext(struct dirtree this)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	58 {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	59 while (this && !this->next) this = this->parent;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	60 if (this) this = this->next;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	61
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	62 return this;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	63 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	64
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	65 // Recursively calculate the number of blocks used by each inode in the tree.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	66 // Returns blocks used by this directory, assigns bytes used to *size.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	67 // Writes total block count to TT.treeblocks and inode count to TT.treeinodes.
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	68
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	69 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	70 {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	71 long blocks;
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 while (this) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	74 *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	75
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	76 if (this->child)
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	77 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	78 else if (S_ISREG(this->st.st_mode)) {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	79 this->st.st_blocks = file_blocks_used(this->st.st_size, 0);
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	80 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	81 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	82 this = this->next;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	83 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	84 TT.treeblocks += blocks = file_blocks_used(*size, 0);
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	85 TT.treeinodes++;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	86
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	87 return blocks;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	88 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	89
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	90 // Calculate inode numbers and link counts.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	91 //
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	92 // 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	93 // ugly n^2 way of dealing with the problem that doesn't scale well to large
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	94 // numbers of files (> 100,000) but can be done in very little code.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	95 // This rewrites inode numbers to their final values, allocating depth first.
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	96
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	97 static void check_treelinks(struct dirtree *tree)
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	98 {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	99 struct dirtree this=tree, that;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	100 long inode = INODES_RESERVED;
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	101
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	102 while (this) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	103 ++inode;
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	104 // 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	105 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	106 else {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	107 dev_t new = this->st.st_dev;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	108
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	109 if (!new) continue;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	110
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	111 this->st.st_nlink = 0;
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	112 for (that = tree; that; that = treenext(that)) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	113 if (this->st.st_ino == that->st.st_ino &&
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	114 this->st.st_dev == that->st.st_dev)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	115 {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	116 this->st.st_nlink++;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	117 this->st.st_ino = inode;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	118 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	119 }
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	120 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	121 this->st.st_ino = inode;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	122 this = treenext(this);
101 ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	123 }
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	124 }
ff85a83e7d7e Calculate st_nlink for each node, via a small but n^2 algorithm. Rob Landley <rob@landley.net> parents: 99 diff changeset	125
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	126 // 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	127 // 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	128 // 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	129 // 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	130 //
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	131 // 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	132 // 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	133
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	134 static void fake_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	135 {
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	136 // 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	137 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	138 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	139 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	140
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	141 // 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	142 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	143 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	144
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	145 // 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	146 // 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	147 // 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	148 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	149 }
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	150
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	151 // Calculate inodes per group from total inodes.
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	152 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	153 {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	154 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	155
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	156 // Round up to fill complete inode blocks.
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	157 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	158 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	159 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	160 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	161
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	162 // Fill out superblock and TT structures.
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	163
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	164 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	165 {
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	166 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	167
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	168 // Set log_block_size and log_frag_size.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	169
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	170 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	171 if (temp==4) error_exit("bad blocksize");
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	172 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	173
80 7a058d60faf1 One more field, minor shrinking, and start on block groups. Rob Landley <rob@landley.net> parents: 79 diff changeset	174 // 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	175
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	176 sb->blocks_count = SWAP_LE32(TT.blocks);
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	177 sb->free_blocks_count = SWAP_LE32(TT.freeblocks);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	178 temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	179 sb->r_blocks_count = SWAP_LE32(temp);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	180
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	181 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	182
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	183 // 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	184 // 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	185
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	186 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	187
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	188 // 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	189 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	190 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	191
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	192 // Determine free inodes.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	193 temp = TT.inodespg*TT.groups - INODES_RESERVED;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	194 if (temp < TT.treeinodes) error_exit("Not enough inodes.\n");
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	195 sb->free_inodes_count = SWAP_LE32(temp - TT.treeinodes);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	196
79 1aff4181427b Filling out most of the ext2 superblock correctly now. Rob Landley <rob@landley.net> parents: 76 diff changeset	197 // Fill out the rest of the superblock.
76 e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	198 sb->max_mnt_count=0xFFFF;
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	199 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	200 sb->magic = SWAP_LE32(0xEF53);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	201 sb->state = sb->errors = SWAP_LE16(1);
e6332139adae More work on mke2fs. Rob Landley <rob@landley.net> parents: 75 diff changeset	202
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	203 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	204 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	205 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	206 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	207 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	208
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	209 fake_uuid(sb->uuid);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	210
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	211 // 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	212
75 89ca591a9236 More random progress on mke2fs. Nothing to see yet. Rob Landley <rob@landley.net> parents: 53 diff changeset	213 //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	214 // 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	215 }
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	216
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	217 // 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	218 static int is_sb_group(uint32_t group)
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	219 {
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	220 int i;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	221
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	222 // 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	223 if(!group \|\| group==1) return 1;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	224 for (i=3; i<9; i+=2) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	225 int j = i;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	226 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	227 if (j==group) return 1;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	228 }
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	229 return 0;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	230 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	231
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	232
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	233 // Number of blocks used in group by optional superblock/group list backup.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	234 static int group_superblock_overhead(uint32_t group)
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	235 {
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	236 int used;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	237
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	238 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	239
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	240 // How many blocks does the group descriptor table take up?
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	241 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	242 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	243 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	244 // 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	245 used++;
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	246 // 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	247 if (!group && TT.blocksize == 1024) used++;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	248
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	249 return used;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	250 }
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	251
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	252 // Number of blocks used in group to store superblock/group/inode list
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	253 static int group_overhead(uint32_t group)
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	254 {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	255 // Return superblock backup overhead (if any), plus block/inode
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	256 // allocation bitmaps, plus inode tables.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	257 return group_superblock_overhead(group) + 2 + get_inodespg(TT.inodespg)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	258 / (TT.blocksize/sizeof(struct ext2_inode));
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	259 }
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	260
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	261 // In bitmap "array" set "len" bits starting at position "start" (from 0).
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	262 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	263 {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	264 while(len) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	265 if ((start&7) \|\| len<8) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	266 array[start/8]\|=(1<<(start&7));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	267 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	268 len--;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	269 } else {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	270 array[start/8]=255;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	271 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	272 len-=8;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	273 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	274 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	275 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	276
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	277 // 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	278 // not seekable
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	279 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	280 {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	281 if(-1 == lseek(TT.fsfd, len, SEEK_SET)) {
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	282 memset(toybuf, 0, sizeof(toybuf));
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	283 while (len) {
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	284 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	285 xwrite(TT.fsfd, toybuf, out);
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	286 len -= out;
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	287 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	288 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	289 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	290
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	291 // Fill out an inode structure from struct stat info in dirtree.
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	292 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	293 {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	294 uint32_t fbu[15];
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	295 int temp;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	296
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	297 file_blocks_used(this->st.st_size, fbu);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	298
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	299 // If this inode needs data blocks allocated to it.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	300 if (this->st.st_size) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	301 int i, group = TT.nextblock/TT.blockbits;
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	302
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	303 // TODO: teach this about indirect blocks.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	304 for (i=0; i<15; i++) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	305 // If we just jumped into a new group, skip group overhead blocks.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	306 while (group >= TT.nextgroup)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	307 TT.nextblock += group_overhead(TT.nextgroup++);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	308 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	309 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	310 // TODO : S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	311 in->mode = SWAP_LE32(this->st.st_mode);
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	312
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	313 in->uid = SWAP_LE16(this->st.st_uid & 0xFFFF);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	314 in->uid_high = SWAP_LE16(this->st.st_uid >> 16);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	315 in->gid = SWAP_LE16(this->st.st_gid & 0xFFFF);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	316 in->gid_high = SWAP_LE16(this->st.st_gid >> 16);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	317 in->size = SWAP_LE32(this->st.st_size & 0xFFFFFFFF);
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	318
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	319 // Contortions to make the compiler not generate a warning for x>>32
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	320 // when x is 32 bits. The optimizer should clean this up.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	321 if (sizeof(this->st.st_size) > 4) temp = 32;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	322 else temp = 0;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	323 if (temp) in->dir_acl = SWAP_LE32(this->st.st_size >> temp);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	324
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	325 in->atime = SWAP_LE32(this->st.st_atime);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	326 in->ctime = SWAP_LE32(this->st.st_ctime);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	327 in->mtime = SWAP_LE32(this->st.st_mtime);
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	328
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	329 in->links_count = SWAP_LE16(this->st.st_nlink);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	330 in->blocks = SWAP_LE32(this->st.st_blocks);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	331 // in->faddr
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	332 }
97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	333
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	334 int mke2fs_main(void)
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	335 {
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	336 int i, temp;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	337 off_t length;
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	338 uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	339 struct dirtree dti, dtb;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	340
81 f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	341 // Handle command line arguments.
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	342
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	343 if (toys.optargs[1]) {
f95f6fd94eed Move superblock initialization to a function. Trim unused padding from Rob Landley <rob@landley.net> parents: 80 diff changeset	344 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	345 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	346 } 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	347 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	348
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	349 // 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	350
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	351 // 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	352 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	353
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	354 // 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	355 // (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	356
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	357 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	358 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	359 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	360 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	361
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	362 // 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	363
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	364 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	365 strncpy(toybuf, TT.gendir, sizeof(toybuf));
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	366 dti = read_dirtree(toybuf, NULL);
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	367 } else {
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	368 dti = xzalloc(sizeof(struct dirtree)+11);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	369 strcpy(dti->name, "lost+found");
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	370 dti->st.st_mode = S_IFDIR\|0755;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	371 dti->st.st_ctime = dti->st.st_mtime = time(NULL);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	372 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	373
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	374 // Add root directory inode. This is iterated through for when finding
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	375 // blocks, but not when finding inodes. The tree's parent pointers don't
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	376 // point back into this.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	377
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	378 dtb = xzalloc(sizeof(struct dirtree)+1);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	379 dtb->st.st_mode = S_IFDIR\|0755;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	380 dtb->st.st_ctime = dtb->st.st_mtime = time(NULL);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	381 dtb->child = dti;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	382
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	383 // Figure out how much space is used by preset files
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	384 length = check_treesize(dtb, &(dtb->st.st_size));
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	385 check_treelinks(dtb);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	386
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	387 // Figure out how many total inodes we need.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	388
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	389 if (!TT.inodes) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	390 if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	391 TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
97 4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	392 }
4c81e6375719 Add parent pointer to dirtree, more work on mke2fs (populate dirtree, count Rob Landley <rob@landley.net> parents: 84 diff changeset	393
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	394 // If we're generating a filesystem and have no idea how many blocks it
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	395 // needs, start with a minimal guess, find the overhead of that many
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	396 // groups, and loop until this is enough groups to store this many blocks.
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	397 if (!TT.blocks) TT.groups = (TT.treeblocks/TT.blockbits)+1;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	398 else TT.groups = div_round_up(TT.blocks, TT.blockbits);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	399
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	400 for (;;) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	401 temp = TT.treeblocks;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	402
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	403 for (i = 0; i<TT.groups; i++) temp += group_overhead(i);
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	404
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	405 if (TT.blocks) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	406 if (TT.blocks < temp) error_exit("Not enough space.\n");
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	407 break;
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	408 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	409 if (temp <= TT.groups * TT.blockbits) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	410 TT.blocks = temp;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	411 break;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	412 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	413 TT.groups++;
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	414 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	415 TT.freeblocks = TT.blocks - temp;
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	416
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	417 // Now we know all the TT data, initialize superblock structure.
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	418
1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	419 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	420
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	421 // Start writing. Skip the first 1k to avoid the boot sector (if any).
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	422 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	423
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	424 // Loop through block groups, write out each one.
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	425 dtiblk = dtbblk = usedblocks = usedinodes = 0;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	426 for (i=0; i<TT.groups; i++) {
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	427 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	428 uint32_t start, itable, used, end;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	429 int j, slot;
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	430
84 bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	431 // 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	432 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	433 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	434
bdbef4ab4ac6 This creates an almost valid empty ext2 filesystem, except for a few superblock Rob Landley <rob@landley.net> parents: 83 diff changeset	435 // 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	436 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	437
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	438 // If a superblock goes here, write it out.
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	439 start = group_superblock_overhead(i);
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	440 if (start) {
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	441 struct ext2_group bg = (struct ext2_group )toybuf;
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	442 int treeblocks = TT.treeblocks, treeinodes = TT.treeinodes;
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	443
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	444 TT.sb.block_group_nr = SWAP_LE16(i);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	445
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	446 // Write superblock and pad it up to block size
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	447 xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	448 temp = TT.blocksize - sizeof(struct ext2_superblock);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	449 if (!i && TT.blocksize > 1024) temp -= 1024;
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	450 memset(toybuf, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	451 xwrite(TT.fsfd, toybuf, temp);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	452
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	453 // Loop through groups to write group descriptor table.
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	454 for(j=0; j<TT.groups; j++) {
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	455
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	456 // Figure out what sector this group starts in.
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	457 used = group_superblock_overhead(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	458
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	459 // 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	460 slot = j % (TT.blocksize/sizeof(struct ext2_group));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	461 if (!slot) {
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	462 if (j) xwrite(TT.fsfd, bg, TT.blocksize);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	463 memset(bg, 0, TT.blocksize);
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	464 }
612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	465
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	466 // How many free inodes in this group?
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	467 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	468 if (!i) temp -= INODES_RESERVED;
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	469 if (temp > treeinodes) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	470 treeinodes -= temp;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	471 temp = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	472 } else {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	473 temp -= treeinodes;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	474 treeinodes = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	475 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	476 bg[slot].free_inodes_count = SWAP_LE16(temp);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	477
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	478 // How many free blocks in this group?
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	479 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	480 temp = end-used-temp;
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	481 if (temp > treeblocks) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	482 treeblocks -= temp;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	483 temp = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	484 } else {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	485 temp -= treeblocks;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	486 treeblocks = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	487 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	488 bg[slot].free_blocks_count = SWAP_LE32(temp);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	489
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	490 // Fill out rest of group structure
104 1c2f6d2e25de Precalculate block and inode usage given a starting file tree. This compiles, Rob Landley <rob@landley.net> parents: 101 diff changeset	491 used += j*TT.blockbits;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	492 bg[slot].block_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	493 bg[slot].inode_bitmap = SWAP_LE32(used++);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	494 bg[slot].inode_table = SWAP_LE32(used);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	495 bg[slot].used_dirs_count = 0; // (TODO)
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	496 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	497 xwrite(TT.fsfd, bg, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	498 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	499
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	500 // 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	501
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	502 // Write block usage bitmap
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	503
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	504 start += 2 + itable;
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	505 memset(toybuf, 0, TT.blocksize);
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	506 bits_set(toybuf, 0, start);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	507 bits_set(toybuf, end, TT.blockbits-end);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	508 temp = TT.treeblocks - usedblocks;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	509 if (temp) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	510 if (end-start > temp) temp = end-start;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	511 bits_set(toybuf, start, temp);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	512 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	513 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	514
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	515 // Write inode bitmap
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	516 memset(toybuf, 0, TT.blocksize);
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	517 j = 0;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	518 if (!i) bits_set(toybuf, 0, j = INODES_RESERVED);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	519 bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	520 temp = TT.treeinodes - usedinodes;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	521 if (temp) {
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	522 if (slot-j > temp) temp = slot-j;
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	523 bits_set(toybuf, j, temp);
c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	524 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	525 xwrite(TT.fsfd, toybuf, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	526
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	527 // Write inode table for this group (TODO)
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	528 for (j = 0; j<TT.inodespg; j++) {
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	529 slot = j % (TT.blocksize/sizeof(struct ext2_inode));
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	530 if (!slot) {
105 c5b6fb1fe3a4 Calculate block and inode usage in group table and bitmaps. Rob Landley <rob@landley.net> parents: 104 diff changeset	531 if (j) xwrite(TT.fsfd, in, TT.blocksize);
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	532 memset(in, 0, TT.blocksize);
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	533 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	534 if (!i && j<INODES_RESERVED) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	535 // Write root inode
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	536 if (j == 2) fill_inode(in+slot, dtb);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	537 } else if (dti) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	538 fill_inode(in+slot, dti);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	539 dti = treenext(dti);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	540 }
83 4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	541 }
4b25264da01b mke2fs: Stopping for dinner. It compiles. Rob Landley <rob@landley.net> parents: 82 diff changeset	542 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	543
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	544 while (dtb) {
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	545 // TODO write index data block
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	546 // TODO write root directory data block
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	547 // TODO write directory data block
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	548 // TODO write file data block
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	549 put_zeroes(TT.blocksize);
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	550 start++;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	551 if (start == end) break;
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	552 }
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	553 // Write data blocks (TODO)
99 97d717829ff0 More work on mke2fs.c. Random in-progress snapshot... Rob Landley <rob@landley.net> parents: 97 diff changeset	554 put_zeroes((end-start) * TT.blocksize);
82 612c8d6c2829 More work on mke2fs. Rob Landley <rob@landley.net> parents: 81 diff changeset	555 }
53 41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	556
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on. Rob Landley <rob@landley.net> parents: diff changeset	557 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	558 }
112 aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	559
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	560 // Scratch pad:
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	561 // b - block size (1024, 2048, 4096)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	562 // F - force (run on mounted device or non-block device)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	563 // i - bytes per inode
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	564 // N - number of inodes
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	565 // m - reserved blocks percentage
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	566 // n - Don't write
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	567 // q - quiet
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	568
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	569 // L - volume label
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	570 // M - last mounted path
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	571 // o - creator os
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	572
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	573 // j - create journal
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	574 // J - journal options (size=1024-102400 blocks,device=)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	575 // device=/dev/blah or LABEL=label UUID=uuid
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	576
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	577 // E - extended options (stride=stripe-size blocks)
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	578 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	579
aadd28817955 Next iteration of mke2fs development. Rob Landley <rob@landley.net> parents: 105 diff changeset	580

Mercurial > hg > toybox

annotate toys/mke2fs.c @ 112:aadd28817955