diff toys/other/mke2fs.c @ 694:786841fdb1e0

Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style. The actual code should be the same afterward, this is just cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Tue, 13 Nov 2012 17:14:08 -0600
parents 7e846e281e38
children
line wrap: on
line diff
--- a/toys/other/mke2fs.c	Tue Nov 13 16:13:45 2012 -0600
+++ b/toys/other/mke2fs.c	Tue Nov 13 17:14:08 2012 -0600
@@ -1,6 +1,4 @@
-/* vi: set ts=4:
- *
- * mke2fs.c - Create an ext2 filesystem image.
+/* mke2fs.c - Create an ext2 filesystem image.
  *
  * Copyright 2006, 2007 Rob Landley <rob@landley.net>
 
@@ -8,155 +6,155 @@
 USE_MKE2FS(NEWTOY(mke2fs, "<1>2g:Fnqm#N#i#b#", TOYFLAG_SBIN))
 
 config MKE2FS
-	bool "mke2fs (unfinished and broken by dirtree changes)"
-	default n
-	help
-	  usage: mke2fs [-Fnq] [-b ###] [-N|i ###] [-m ###] device
+  bool "mke2fs (unfinished and broken by dirtree changes)"
+  default n
+  help
+    usage: mke2fs [-Fnq] [-b ###] [-N|i ###] [-m ###] device
 
-	  Create an ext2 filesystem on a block device or filesystem image.
+    Create an ext2 filesystem on a block device or filesystem image.
 
-	  -F         Force to run on a mounted device
-	  -n         Don't write to device
-	  -q         Quiet (no output)
-	  -b size    Block size (1024, 2048, or 4096)
-	  -N inodes  Allocate this many inodes
-	  -i bytes   Allocate one inode for every XXX bytes of device
-	  -m percent Reserve this percent of filesystem space for root user
+    -F         Force to run on a mounted device
+    -n         Don't write to device
+    -q         Quiet (no output)
+    -b size    Block size (1024, 2048, or 4096)
+    -N inodes  Allocate this many inodes
+    -i bytes   Allocate one inode for every XXX bytes of device
+    -m percent Reserve this percent of filesystem space for root user
 
 config MKE2FS_JOURNAL
-	bool "Journaling support (ext3)"
-	default n
-	depends on MKE2FS
-	help
-	  usage: [-j] [-J size=###,device=XXX]
+  bool "Journaling support (ext3)"
+  default n
+  depends on MKE2FS
+  help
+    usage: [-j] [-J size=###,device=XXX]
 
-	  -j         Create journal (ext3)
-	  -J         Journal options
-	             size: Number of blocks (1024-102400)
-	             device: Specify an external journal
+    -j         Create journal (ext3)
+    -J         Journal options
+               size: Number of blocks (1024-102400)
+               device: Specify an external journal
 
 config MKE2FS_GEN
-	bool "Generate (gene2fs)"
-	default n
-	depends on MKE2FS
-	help
-	  usage: gene2fs [options] device filename
+  bool "Generate (gene2fs)"
+  default n
+  depends on MKE2FS
+  help
+    usage: gene2fs [options] device filename
 
-	  The [options] are the same as mke2fs.
+    The [options] are the same as mke2fs.
 
 config MKE2FS_LABEL
-	bool "Label support"
-	default n
-	depends on MKE2FS
-	help
-	  usage: mke2fs [-L label] [-M path] [-o string]
+  bool "Label support"
+  default n
+  depends on MKE2FS
+  help
+    usage: mke2fs [-L label] [-M path] [-o string]
 
-	  -L         Volume label
-	  -M         Path to mount point
-	  -o         Created by
+    -L         Volume label
+    -M         Path to mount point
+    -o         Created by
 
 config MKE2FS_EXTENDED
-	bool "Extended options"
-	default n
-	depends on MKE2FS
-	help
-	  usage: mke2fs [-E stride=###] [-O option[,option]]
+  bool "Extended options"
+  default n
+  depends on MKE2FS
+  help
+    usage: mke2fs [-E stride=###] [-O option[,option]]
 
-	  -E stride= Set RAID stripe size (in blocks)
-	  -O [opts]  Specify fewer ext2 option flags (for old kernels)
-	             All of these are on by default (as appropriate)
-	     none         Clear default options (all but journaling)
-	     dir_index    Use htree indexes for large directories
-	     filetype     Store file type info in directory entry
-	     has_journal  Set by -j
-	     journal_dev  Set by -J device=XXX
-	     sparse_super Don't allocate huge numbers of redundant superblocks
+    -E stride= Set RAID stripe size (in blocks)
+    -O [opts]  Specify fewer ext2 option flags (for old kernels)
+               All of these are on by default (as appropriate)
+       none         Clear default options (all but journaling)
+       dir_index    Use htree indexes for large directories
+       filetype     Store file type info in directory entry
+       has_journal  Set by -j
+       journal_dev  Set by -J device=XXX
+       sparse_super Don't allocate huge numbers of redundant superblocks
 */
 
 #define FOR_mke2fs
 #include "toys.h"
 
 GLOBALS(
-	// Command line arguments.
-	long blocksize;
-	long bytes_per_inode;
-	long inodes;           // Total inodes in filesystem.
-	long reserved_percent; // Integer precent of space to reserve for root.
-	char *gendir;          // Where to read dirtree from.
+  // Command line arguments.
+  long blocksize;
+  long bytes_per_inode;
+  long inodes;           // Total inodes in filesystem.
+  long reserved_percent; // Integer precent of space to reserve for root.
+  char *gendir;          // Where to read dirtree from.
 
-	// Internal data.
-	struct dirtree *dt;    // Tree of files to copy into the new filesystem.
-	unsigned treeblocks;   // Blocks used by dt
-	unsigned treeinodes;   // Inodes used by dt
+  // Internal data.
+  struct dirtree *dt;    // Tree of files to copy into the new filesystem.
+  unsigned treeblocks;   // Blocks used by dt
+  unsigned treeinodes;   // Inodes used by dt
 
-	unsigned blocks;       // Total blocks in the filesystem.
-	unsigned freeblocks;   // Free blocks in the filesystem.
-	unsigned inodespg;     // Inodes per group
-	unsigned groups;       // Total number of block groups.
-	unsigned blockbits;    // Bits per block.  (Also blocks per group.)
+  unsigned blocks;       // Total blocks in the filesystem.
+  unsigned freeblocks;   // Free blocks in the filesystem.
+  unsigned inodespg;     // Inodes per group
+  unsigned groups;       // Total number of block groups.
+  unsigned blockbits;    // Bits per block.  (Also blocks per group.)
 
-	// For gene2fs
-	unsigned nextblock;    // Next data block to allocate
-	unsigned nextgroup;    // Next group we'll be allocating from
-	int fsfd;              // File descriptor of filesystem (to output to).
+  // For gene2fs
+  unsigned nextblock;    // Next data block to allocate
+  unsigned nextgroup;    // Next group we'll be allocating from
+  int fsfd;              // File descriptor of filesystem (to output to).
 
-	struct ext2_superblock sb;
+  struct ext2_superblock sb;
 )
 
 #define INODES_RESERVED 10
 
 static uint32_t div_round_up(uint32_t a, uint32_t b)
 {
-	uint32_t c = a/b;
+  uint32_t c = a/b;
 
-	if (a%b) c++;
-	return c;
+  if (a%b) c++;
+  return c;
 }
 
 // Calculate data blocks plus index blocks needed to hold a file.
 
 static uint32_t file_blocks_used(uint64_t size, uint32_t *blocklist)
 {
-	uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize);
-	uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0;
+  uint32_t dblocks = (uint32_t)((size+(TT.blocksize-1))/TT.blocksize);
+  uint32_t idx=TT.blocksize/4, iblocks=0, diblocks=0, tiblocks=0;
 
-	// Fill out index blocks in inode.
+  // Fill out index blocks in inode.
 
-	if (blocklist) {
-		int i;
+  if (blocklist) {
+    int i;
 
-		// Direct index blocks
-		for (i=0; i<13 && i<dblocks; i++) blocklist[i] = i;
-		// Singly indirect index blocks
-		if (dblocks > 13+idx) blocklist[13] = 13+idx;
-		// Doubly indirect index blocks
-		idx = 13 + idx + (idx*idx);
-		if (dblocks > idx) blocklist[14] = idx;
+    // Direct index blocks
+    for (i=0; i<13 && i<dblocks; i++) blocklist[i] = i;
+    // Singly indirect index blocks
+    if (dblocks > 13+idx) blocklist[13] = 13+idx;
+    // Doubly indirect index blocks
+    idx = 13 + idx + (idx*idx);
+    if (dblocks > idx) blocklist[14] = idx;
 
-		return 0;
-	}
+    return 0;
+  }
 
-	// Account for direct, singly, doubly, and triply indirect index blocks
+  // Account for direct, singly, doubly, and triply indirect index blocks
 
-	if (dblocks > 12) {
-		iblocks = ((dblocks-13)/idx)+1;
-		if (iblocks > 1) {
-			diblocks = ((iblocks-2)/idx)+1;
-			if (diblocks > 1)
-				tiblocks = ((diblocks-2)/idx)+1;
-		}
-	}
+  if (dblocks > 12) {
+    iblocks = ((dblocks-13)/idx)+1;
+    if (iblocks > 1) {
+      diblocks = ((iblocks-2)/idx)+1;
+      if (diblocks > 1)
+        tiblocks = ((diblocks-2)/idx)+1;
+    }
+  }
 
-	return dblocks + iblocks + diblocks + tiblocks;
+  return dblocks + iblocks + diblocks + tiblocks;
 }
 
 // Use the parent pointer to iterate through the tree non-recursively.
 static struct dirtree *treenext(struct dirtree *this)
 {
-	while (this && !this->next) this = this->parent;
-	if (this) this = this->next;
+  while (this && !this->next) this = this->parent;
+  if (this) this = this->next;
 
-	return this;
+  return this;
 }
 
 // Recursively calculate the number of blocks used by each inode in the tree.
@@ -165,27 +163,27 @@
 
 static long check_treesize(struct dirtree *that, off_t *size)
 {
-	long blocks;
+  long blocks;
 
-	while (that) {
-		*size += sizeof(struct ext2_dentry) + strlen(that->name);
+  while (that) {
+    *size += sizeof(struct ext2_dentry) + strlen(that->name);
 
-		if (that->child)
-			that->st.st_blocks = check_treesize(that->child, &that->st.st_size);
-		else if (S_ISREG(that->st.st_mode)) {
-			 that->st.st_blocks = file_blocks_used(that->st.st_size, 0);
-			 TT.treeblocks += that->st.st_blocks;
-		}
-		that = that->next;
-	}
-	TT.treeblocks += blocks = file_blocks_used(*size, 0);
-	TT.treeinodes++;
+    if (that->child)
+      that->st.st_blocks = check_treesize(that->child, &that->st.st_size);
+    else if (S_ISREG(that->st.st_mode)) {
+       that->st.st_blocks = file_blocks_used(that->st.st_size, 0);
+       TT.treeblocks += that->st.st_blocks;
+    }
+    that = that->next;
+  }
+  TT.treeblocks += blocks = file_blocks_used(*size, 0);
+  TT.treeinodes++;
 
-	return blocks;
+  return blocks;
 }
 
 // Calculate inode numbers and link counts.
-// 
+//
 // To do this right I need to copy the tree and sort it, but here's a really
 // ugly n^2 way of dealing with the problem that doesn't scale well to large
 // numbers of files (> 100,000) but can be done in very little code.
@@ -193,32 +191,32 @@
 
 static void check_treelinks(struct dirtree *tree)
 {
-	struct dirtree *current=tree, *that;
-	long inode = INODES_RESERVED;
+  struct dirtree *current=tree, *that;
+  long inode = INODES_RESERVED;
 
-	while (current) {
-		++inode;
-		// Since we can't hardlink to directories, we know their link count.
-		if (S_ISDIR(current->st.st_mode)) current->st.st_nlink = 2;
-		else {
-			dev_t new = current->st.st_dev;
+  while (current) {
+    ++inode;
+    // Since we can't hardlink to directories, we know their link count.
+    if (S_ISDIR(current->st.st_mode)) current->st.st_nlink = 2;
+    else {
+      dev_t new = current->st.st_dev;
 
-			if (!new) continue;
+      if (!new) continue;
 
-			// Look for other copies of current node
-			current->st.st_nlink = 0;
-			for (that = tree; that; that = treenext(that)) {
-				if (current->st.st_ino == that->st.st_ino &&
-					current->st.st_dev == that->st.st_dev)
-				{
-					current->st.st_nlink++;
-					current->st.st_ino = inode;
-				}
-			}
-		}
-		current->st.st_ino = inode;
-		current = treenext(current);
-	}
+      // Look for other copies of current node
+      current->st.st_nlink = 0;
+      for (that = tree; that; that = treenext(that)) {
+        if (current->st.st_ino == that->st.st_ino &&
+          current->st.st_dev == that->st.st_dev)
+        {
+          current->st.st_nlink++;
+          current->st.st_ino = inode;
+        }
+      }
+    }
+    current->st.st_ino = inode;
+    current = treenext(current);
+  }
 }
 
 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
@@ -231,202 +229,202 @@
 
 static void create_uuid(char *uuid)
 {
-	// Read 128 random bits
-	int fd = xopen("/dev/urandom", O_RDONLY);
-	xreadall(fd, uuid, 16);
-	close(fd);
+  // Read 128 random bits
+  int fd = xopen("/dev/urandom", O_RDONLY);
+  xreadall(fd, uuid, 16);
+  close(fd);
 
-	// Claim to be a DCE format UUID.
-	uuid[6] = (uuid[6] & 0x0F) | 0x40;
-	uuid[8] = (uuid[8] & 0x3F) | 0x80;
+  // Claim to be a DCE format UUID.
+  uuid[6] = (uuid[6] & 0x0F) | 0x40;
+  uuid[8] = (uuid[8] & 0x3F) | 0x80;
 
-    // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should
-	// set bit 1 of the node ID, which is the mac multicast bit.  This means we
-	// should never collide with anybody actually using a macaddr.
-	uuid[11] = uuid[11] | 128;
+  // rfc2518 section 6.4.1 suggests if we're not using a macaddr, we should
+  // set bit 1 of the node ID, which is the mac multicast bit.  This means we
+  // should never collide with anybody actually using a macaddr.
+  uuid[11] = uuid[11] | 128;
 }
 
 // Calculate inodes per group from total inodes.
 static uint32_t get_inodespg(uint32_t inodes)
 {
-	uint32_t temp;
+  uint32_t temp;
 
-	// Round up to fill complete inode blocks.
-	temp = (inodes + TT.groups - 1) / TT.groups;
-	inodes = TT.blocksize/sizeof(struct ext2_inode);
-	return ((temp + inodes - 1)/inodes)*inodes;
+  // Round up to fill complete inode blocks.
+  temp = (inodes + TT.groups - 1) / TT.groups;
+  inodes = TT.blocksize/sizeof(struct ext2_inode);
+  return ((temp + inodes - 1)/inodes)*inodes;
 }
 
 // Fill out superblock and TT structures.
 
 static void init_superblock(struct ext2_superblock *sb)
 {
-	uint32_t temp;
+  uint32_t temp;
 
-	// Set log_block_size and log_frag_size.
+  // Set log_block_size and log_frag_size.
 
-	for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break;
-	if (temp==4) error_exit("bad blocksize");
-	sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp);
+  for (temp = 0; temp < 4; temp++) if (TT.blocksize == 1024<<temp) break;
+  if (temp==4) error_exit("bad blocksize");
+  sb->log_block_size = sb->log_frag_size = SWAP_LE32(temp);
 
-	// Fill out blocks_count, r_blocks_count, first_data_block
+  // Fill out blocks_count, r_blocks_count, first_data_block
 
-	sb->blocks_count = SWAP_LE32(TT.blocks);
-	sb->free_blocks_count = SWAP_LE32(TT.freeblocks);
-	temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
-	sb->r_blocks_count = SWAP_LE32(temp);
+  sb->blocks_count = SWAP_LE32(TT.blocks);
+  sb->free_blocks_count = SWAP_LE32(TT.freeblocks);
+  temp = (TT.blocks * (uint64_t)TT.reserved_percent) / 100;
+  sb->r_blocks_count = SWAP_LE32(temp);
 
-	sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0);
+  sb->first_data_block = SWAP_LE32(TT.blocksize == 1024 ? 1 : 0);
 
-	// Set blocks_per_group and frags_per_group, which is the size of an
-	// allocation bitmap that fits in one block (I.E. how many bits per block)?
+  // Set blocks_per_group and frags_per_group, which is the size of an
+  // allocation bitmap that fits in one block (I.E. how many bits per block)?
 
-	sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits);
+  sb->blocks_per_group = sb->frags_per_group = SWAP_LE32(TT.blockbits);
 
-	// Set inodes_per_group and total inodes_count
-	sb->inodes_per_group = SWAP_LE32(TT.inodespg);
-	sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups);
+  // Set inodes_per_group and total inodes_count
+  sb->inodes_per_group = SWAP_LE32(TT.inodespg);
+  sb->inodes_count = SWAP_LE32(TT.inodespg * TT.groups);
 
-	// Determine free inodes.
-	temp = TT.inodespg*TT.groups - INODES_RESERVED;
-	if (temp < TT.treeinodes) error_exit("Not enough inodes.\n");
-	sb->free_inodes_count = SWAP_LE32(temp - TT.treeinodes);
+  // Determine free inodes.
+  temp = TT.inodespg*TT.groups - INODES_RESERVED;
+  if (temp < TT.treeinodes) error_exit("Not enough inodes.\n");
+  sb->free_inodes_count = SWAP_LE32(temp - TT.treeinodes);
 
-	// Fill out the rest of the superblock.
-	sb->max_mnt_count=0xFFFF;
-	sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL));
-	sb->magic = SWAP_LE32(0xEF53);
-	sb->state = sb->errors = SWAP_LE16(1);
+  // Fill out the rest of the superblock.
+  sb->max_mnt_count=0xFFFF;
+  sb->wtime = sb->lastcheck = sb->mkfs_time = SWAP_LE32(time(NULL));
+  sb->magic = SWAP_LE32(0xEF53);
+  sb->state = sb->errors = SWAP_LE16(1);
 
-	sb->rev_level = SWAP_LE32(1);
-	sb->first_ino = SWAP_LE32(INODES_RESERVED+1);
-	sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode));
-	sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
-	sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
+  sb->rev_level = SWAP_LE32(1);
+  sb->first_ino = SWAP_LE32(INODES_RESERVED+1);
+  sb->inode_size = SWAP_LE16(sizeof(struct ext2_inode));
+  sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
+  sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
 
-	create_uuid(sb->uuid);
-	
-	// TODO If we're called as mke3fs or mkfs.ext3, do a journal.
+  create_uuid(sb->uuid);
 
-	//if (strchr(toys.which->name,'3'))
-	//	sb->feature_compat |= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL);
+  // TODO If we're called as mke3fs or mkfs.ext3, do a journal.
+
+  //if (strchr(toys.which->name,'3'))
+  //	sb->feature_compat |= SWAP_LE32(EXT3_FEATURE_COMPAT_HAS_JOURNAL);
 }
 
 // Does this group contain a superblock backup (and group descriptor table)?
 static int is_sb_group(uint32_t group)
 {
-	int i;
+  int i;
 
-	// Superblock backups are on groups 0, 1, and powers of 3, 5, and 7.
-	if(!group || group==1) return 1;
-	for (i=3; i<9; i+=2) {
-		int j = i;
-		while (j<group) j*=i;
-		if (j==group) return 1;
-	}
-	return 0;
+  // Superblock backups are on groups 0, 1, and powers of 3, 5, and 7.
+  if(!group || group==1) return 1;
+  for (i=3; i<9; i+=2) {
+    int j = i;
+    while (j<group) j*=i;
+    if (j==group) return 1;
+  }
+  return 0;
 }
 
-	
+
 // Number of blocks used in group by optional superblock/group list backup.
 static int group_superblock_overhead(uint32_t group)
 {
-	int used;
+  int used;
 
-	if (!is_sb_group(group)) return 0;
+  if (!is_sb_group(group)) return 0;
 
-	// How many blocks does the group descriptor table take up?
-	used = TT.groups * sizeof(struct ext2_group);
-	used += TT.blocksize - 1;
-	used /= TT.blocksize;
-	// Plus the superblock itself.
-	used++;
-	// And a corner case.
-	if (!group && TT.blocksize == 1024) used++;
+  // How many blocks does the group descriptor table take up?
+  used = TT.groups * sizeof(struct ext2_group);
+  used += TT.blocksize - 1;
+  used /= TT.blocksize;
+  // Plus the superblock itself.
+  used++;
+  // And a corner case.
+  if (!group && TT.blocksize == 1024) used++;
 
-	return used;
+  return used;
 }
 
 // Number of blocks used in group to store superblock/group/inode list
 static int group_overhead(uint32_t group)
 {
-	// Return superblock backup overhead (if any), plus block/inode
-	// allocation bitmaps, plus inode tables.
-	return group_superblock_overhead(group) + 2 + get_inodespg(TT.inodespg)
-				/ (TT.blocksize/sizeof(struct ext2_inode));
+  // Return superblock backup overhead (if any), plus block/inode
+  // allocation bitmaps, plus inode tables.
+  return group_superblock_overhead(group) + 2 + get_inodespg(TT.inodespg)
+        / (TT.blocksize/sizeof(struct ext2_inode));
 }
 
 // In bitmap "array" set "len" bits starting at position "start" (from 0).
 static void bits_set(char *array, int start, int len)
 {
-	while(len) {
-		if ((start&7) || len<8) {
-			array[start/8]|=(1<<(start&7));
-			start++;
-			len--;
-		} else {
-			array[start/8]=255;
-			start+=8;
-			len-=8;
-		}
-	}
+  while(len) {
+    if ((start&7) || len<8) {
+      array[start/8]|=(1<<(start&7));
+      start++;
+      len--;
+    } else {
+      array[start/8]=255;
+      start+=8;
+      len-=8;
+    }
+  }
 }
 
 // Seek past len bytes (to maintain sparse file), or write zeroes if output
 // not seekable
 static void put_zeroes(int len)
 {
-	if(-1 == lseek(TT.fsfd, len, SEEK_SET)) {
-		memset(toybuf, 0, sizeof(toybuf));
-		while (len) {
-			int out = len > sizeof(toybuf) ? sizeof(toybuf) : len;
-			xwrite(TT.fsfd, toybuf, out);
-			len -= out;
-		}
-	}
+  if(-1 == lseek(TT.fsfd, len, SEEK_SET)) {
+    memset(toybuf, 0, sizeof(toybuf));
+    while (len) {
+      int out = len > sizeof(toybuf) ? sizeof(toybuf) : len;
+      xwrite(TT.fsfd, toybuf, out);
+      len -= out;
+    }
+  }
 }
 
 // Fill out an inode structure from struct stat info in dirtree.
 static void fill_inode(struct ext2_inode *in, struct dirtree *that)
 {
-	uint32_t fbu[15];
-	int temp;
+  uint32_t fbu[15];
+  int temp;
 
-	file_blocks_used(that->st.st_size, fbu);
+  file_blocks_used(that->st.st_size, fbu);
 
-	// If that inode needs data blocks allocated to it.
-	if (that->st.st_size) {
-		int i, group = TT.nextblock/TT.blockbits;
+  // If that inode needs data blocks allocated to it.
+  if (that->st.st_size) {
+    int i, group = TT.nextblock/TT.blockbits;
 
-		// TODO: teach this about indirect blocks.
-		for (i=0; i<15; i++) {
-			// If we just jumped into a new group, skip group overhead blocks.
-			while (group >= TT.nextgroup)
-				TT.nextblock += group_overhead(TT.nextgroup++);
-		}
-	}
-	// TODO :  S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
-	in->mode = SWAP_LE32(that->st.st_mode);
+    // TODO: teach this about indirect blocks.
+    for (i=0; i<15; i++) {
+      // If we just jumped into a new group, skip group overhead blocks.
+      while (group >= TT.nextgroup)
+        TT.nextblock += group_overhead(TT.nextgroup++);
+    }
+  }
+  // TODO :  S_ISREG/DIR/CHR/BLK/FIFO/LNK/SOCK(m)
+  in->mode = SWAP_LE32(that->st.st_mode);
 
-	in->uid = SWAP_LE16(that->st.st_uid & 0xFFFF);
-	in->uid_high = SWAP_LE16(that->st.st_uid >> 16);
-	in->gid = SWAP_LE16(that->st.st_gid & 0xFFFF);
-	in->gid_high = SWAP_LE16(that->st.st_gid >> 16);
-	in->size = SWAP_LE32(that->st.st_size & 0xFFFFFFFF);
+  in->uid = SWAP_LE16(that->st.st_uid & 0xFFFF);
+  in->uid_high = SWAP_LE16(that->st.st_uid >> 16);
+  in->gid = SWAP_LE16(that->st.st_gid & 0xFFFF);
+  in->gid_high = SWAP_LE16(that->st.st_gid >> 16);
+  in->size = SWAP_LE32(that->st.st_size & 0xFFFFFFFF);
 
-	// Contortions to make the compiler not generate a warning for x>>32
-	// when x is 32 bits.  The optimizer should clean this up.
-	if (sizeof(that->st.st_size) > 4) temp = 32;
-	else temp = 0;
-	if (temp) in->dir_acl = SWAP_LE32(that->st.st_size >> temp);
-	
-	in->atime = SWAP_LE32(that->st.st_atime);
-	in->ctime = SWAP_LE32(that->st.st_ctime);
-	in->mtime = SWAP_LE32(that->st.st_mtime);
+  // Contortions to make the compiler not generate a warning for x>>32
+  // when x is 32 bits.  The optimizer should clean this up.
+  if (sizeof(that->st.st_size) > 4) temp = 32;
+  else temp = 0;
+  if (temp) in->dir_acl = SWAP_LE32(that->st.st_size >> temp);
 
-	in->links_count = SWAP_LE16(that->st.st_nlink);
-	in->blocks = SWAP_LE32(that->st.st_blocks);
-	// in->faddr
+  in->atime = SWAP_LE32(that->st.st_atime);
+  in->ctime = SWAP_LE32(that->st.st_ctime);
+  in->mtime = SWAP_LE32(that->st.st_mtime);
+
+  in->links_count = SWAP_LE16(that->st.st_nlink);
+  in->blocks = SWAP_LE32(that->st.st_blocks);
+  // in->faddr
 }
 
 // Works like an archiver.
@@ -435,224 +433,224 @@
 
 void mke2fs_main(void)
 {
-	int i, temp;
-	off_t length;
-	uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
-	struct dirtree *dti, *dtb;
+  int i, temp;
+  off_t length;
+  uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
+  struct dirtree *dti, *dtb;
 
-	// Handle command line arguments.
+  // Handle command line arguments.
 
-	if (toys.optargs[1]) {
-		sscanf(toys.optargs[1], "%u", &TT.blocks);
-		temp = O_RDWR|O_CREAT;
-	} else temp = O_RDWR;
-	if (!TT.reserved_percent) TT.reserved_percent = 5;
+  if (toys.optargs[1]) {
+    sscanf(toys.optargs[1], "%u", &TT.blocks);
+    temp = O_RDWR|O_CREAT;
+  } else temp = O_RDWR;
+  if (!TT.reserved_percent) TT.reserved_percent = 5;
 
-	// TODO: Check if filesystem is mounted here
+  // TODO: Check if filesystem is mounted here
+
+  // For mke?fs, open file.  For gene?fs, create file.
+  TT.fsfd = xcreate(*toys.optargs, temp, 0777);
 
-	// For mke?fs, open file.  For gene?fs, create file.
-	TT.fsfd = xcreate(*toys.optargs, temp, 0777);
-	
-	// Determine appropriate block size and block count from file length.
-	// (If no length, default to 4k.  They can override it on the cmdline.)
+  // Determine appropriate block size and block count from file length.
+  // (If no length, default to 4k.  They can override it on the cmdline.)
 
-	length = fdlength(TT.fsfd);
-	if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
-	TT.blockbits = 8*TT.blocksize;
-	if (!TT.blocks) TT.blocks = length/TT.blocksize;
+  length = fdlength(TT.fsfd);
+  if (!TT.blocksize) TT.blocksize = (length && length < 1<<29) ? 1024 : 4096;
+  TT.blockbits = 8*TT.blocksize;
+  if (!TT.blocks) TT.blocks = length/TT.blocksize;
 
-	// Collect gene2fs list or lost+found, calculate requirements.
+  // Collect gene2fs list or lost+found, calculate requirements.
 
-	if (TT.gendir) {
-		strncpy(toybuf, TT.gendir, sizeof(toybuf));
-		dti = dirtree_read(toybuf, NULL, NULL);
-	} else {
-		dti = xzalloc(sizeof(struct dirtree)+11);
-		strcpy(dti->name, "lost+found");
-		dti->st.st_mode = S_IFDIR|0755;
-		dti->st.st_ctime = dti->st.st_mtime = time(NULL);
-	}
+  if (TT.gendir) {
+    strncpy(toybuf, TT.gendir, sizeof(toybuf));
+    dti = dirtree_read(toybuf, NULL, NULL);
+  } else {
+    dti = xzalloc(sizeof(struct dirtree)+11);
+    strcpy(dti->name, "lost+found");
+    dti->st.st_mode = S_IFDIR|0755;
+    dti->st.st_ctime = dti->st.st_mtime = time(NULL);
+  }
 
-	// Add root directory inode.  This is iterated through for when finding
-	// blocks, but not when finding inodes.  The tree's parent pointers don't
-	// point back into this.
+  // Add root directory inode.  This is iterated through for when finding
+  // blocks, but not when finding inodes.  The tree's parent pointers don't
+  // point back into this.
 
-	dtb = xzalloc(sizeof(struct dirtree)+1);
-	dtb->st.st_mode = S_IFDIR|0755;
-	dtb->st.st_ctime = dtb->st.st_mtime = time(NULL);
-	dtb->child = dti;
-	
-	// Figure out how much space is used by preset files
-	length = check_treesize(dtb, &(dtb->st.st_size));
-	check_treelinks(dtb);
+  dtb = xzalloc(sizeof(struct dirtree)+1);
+  dtb->st.st_mode = S_IFDIR|0755;
+  dtb->st.st_ctime = dtb->st.st_mtime = time(NULL);
+  dtb->child = dti;
 
-	// Figure out how many total inodes we need.
+  // Figure out how much space is used by preset files
+  length = check_treesize(dtb, &(dtb->st.st_size));
+  check_treelinks(dtb);
+
+  // Figure out how many total inodes we need.
 
-	if (!TT.inodes) {
-		if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
-		TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
-	}
+  if (!TT.inodes) {
+    if (!TT.bytes_per_inode) TT.bytes_per_inode = 8192;
+    TT.inodes = (TT.blocks * (uint64_t)TT.blocksize) / TT.bytes_per_inode;
+  }
 
-	// If we're generating a filesystem and have no idea how many blocks it
-	// needs, start with a minimal guess, find the overhead of that many
-	// groups, and loop until this is enough groups to store this many blocks.
-	if (!TT.blocks) TT.groups = (TT.treeblocks/TT.blockbits)+1;
-	else TT.groups = div_round_up(TT.blocks, TT.blockbits);
+  // If we're generating a filesystem and have no idea how many blocks it
+  // needs, start with a minimal guess, find the overhead of that many
+  // groups, and loop until this is enough groups to store this many blocks.
+  if (!TT.blocks) TT.groups = (TT.treeblocks/TT.blockbits)+1;
+  else TT.groups = div_round_up(TT.blocks, TT.blockbits);
 
-	for (;;) {
-		temp = TT.treeblocks;
+  for (;;) {
+    temp = TT.treeblocks;
 
-		for (i = 0; i<TT.groups; i++) temp += group_overhead(i);
+    for (i = 0; i<TT.groups; i++) temp += group_overhead(i);
 
-		if (TT.blocks) {
-			if (TT.blocks < temp) error_exit("Not enough space.\n");
-			break;
-		}
-		if (temp <= TT.groups * TT.blockbits) {
-			TT.blocks = temp;
-			break;
-		}
-		TT.groups++;
-	}
-	TT.freeblocks = TT.blocks - temp;
+    if (TT.blocks) {
+      if (TT.blocks < temp) error_exit("Not enough space.\n");
+      break;
+    }
+    if (temp <= TT.groups * TT.blockbits) {
+      TT.blocks = temp;
+      break;
+    }
+    TT.groups++;
+  }
+  TT.freeblocks = TT.blocks - temp;
 
-	// Now we know all the TT data, initialize superblock structure.
+  // Now we know all the TT data, initialize superblock structure.
 
-	init_superblock(&TT.sb);
+  init_superblock(&TT.sb);
 
-	// Start writing.  Skip the first 1k to avoid the boot sector (if any).
-	put_zeroes(1024);
+  // Start writing.  Skip the first 1k to avoid the boot sector (if any).
+  put_zeroes(1024);
 
-	// Loop through block groups, write out each one.
-	dtiblk = dtbblk = usedblocks = usedinodes = 0;
-	for (i=0; i<TT.groups; i++) {
-		struct ext2_inode *in = (struct ext2_inode *)toybuf;
-		uint32_t start, itable, used, end;
-		int j, slot;
+  // Loop through block groups, write out each one.
+  dtiblk = dtbblk = usedblocks = usedinodes = 0;
+  for (i=0; i<TT.groups; i++) {
+    struct ext2_inode *in = (struct ext2_inode *)toybuf;
+    uint32_t start, itable, used, end;
+    int j, slot;
 
-		// Where does this group end?
-		end = TT.blockbits;
-		if ((i+1)*TT.blockbits > TT.blocks) end = TT.blocks & (TT.blockbits-1);
+    // Where does this group end?
+    end = TT.blockbits;
+    if ((i+1)*TT.blockbits > TT.blocks) end = TT.blocks & (TT.blockbits-1);
 
-		// Blocks used by inode table
-		itable = (TT.inodespg*sizeof(struct ext2_inode))/TT.blocksize;
+    // Blocks used by inode table
+    itable = (TT.inodespg*sizeof(struct ext2_inode))/TT.blocksize;
 
-		// If a superblock goes here, write it out.
-		start = group_superblock_overhead(i);
-		if (start) {
-			struct ext2_group *bg = (struct ext2_group *)toybuf;
-			int treeblocks = TT.treeblocks, treeinodes = TT.treeinodes;
+    // If a superblock goes here, write it out.
+    start = group_superblock_overhead(i);
+    if (start) {
+      struct ext2_group *bg = (struct ext2_group *)toybuf;
+      int treeblocks = TT.treeblocks, treeinodes = TT.treeinodes;
 
-			TT.sb.block_group_nr = SWAP_LE16(i);
+      TT.sb.block_group_nr = SWAP_LE16(i);
 
-			// Write superblock and pad it up to block size
-			xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
-			temp = TT.blocksize - sizeof(struct ext2_superblock);
-			if (!i && TT.blocksize > 1024) temp -= 1024;
-			memset(toybuf, 0, TT.blocksize);
-			xwrite(TT.fsfd, toybuf, temp);
+      // Write superblock and pad it up to block size
+      xwrite(TT.fsfd, &TT.sb, sizeof(struct ext2_superblock));
+      temp = TT.blocksize - sizeof(struct ext2_superblock);
+      if (!i && TT.blocksize > 1024) temp -= 1024;
+      memset(toybuf, 0, TT.blocksize);
+      xwrite(TT.fsfd, toybuf, temp);
 
-			// Loop through groups to write group descriptor table.
-			for(j=0; j<TT.groups; j++) {
+      // Loop through groups to write group descriptor table.
+      for(j=0; j<TT.groups; j++) {
 
-				// Figure out what sector this group starts in.
-				used = group_superblock_overhead(j);
+        // Figure out what sector this group starts in.
+        used = group_superblock_overhead(j);
 
-				// Find next array slot in this block (flush block if full).
-				slot = j % (TT.blocksize/sizeof(struct ext2_group));
-				if (!slot) {
-					if (j) xwrite(TT.fsfd, bg, TT.blocksize);
-					memset(bg, 0, TT.blocksize);
-				}
+        // Find next array slot in this block (flush block if full).
+        slot = j % (TT.blocksize/sizeof(struct ext2_group));
+        if (!slot) {
+          if (j) xwrite(TT.fsfd, bg, TT.blocksize);
+          memset(bg, 0, TT.blocksize);
+        }
 
-				// How many free inodes in this group?
-				temp = TT.inodespg;
-				if (!i) temp -= INODES_RESERVED;
-				if (temp > treeinodes) {
-					treeinodes -= temp;
-					temp = 0;
-				} else {
-					temp -= treeinodes;
-					treeinodes = 0;
-				}
-				bg[slot].free_inodes_count = SWAP_LE16(temp);
+        // How many free inodes in this group?
+        temp = TT.inodespg;
+        if (!i) temp -= INODES_RESERVED;
+        if (temp > treeinodes) {
+          treeinodes -= temp;
+          temp = 0;
+        } else {
+          temp -= treeinodes;
+          treeinodes = 0;
+        }
+        bg[slot].free_inodes_count = SWAP_LE16(temp);
 
-				// How many free blocks in this group?
-				temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2;
-				temp = end-used-temp;
-				if (temp > treeblocks) {
-					treeblocks -= temp;
-					temp = 0;
-				} else {
-					temp -= treeblocks;
-					treeblocks = 0;
-				}
-				bg[slot].free_blocks_count = SWAP_LE32(temp);
+        // How many free blocks in this group?
+        temp = TT.inodespg/(TT.blocksize/sizeof(struct ext2_inode)) + 2;
+        temp = end-used-temp;
+        if (temp > treeblocks) {
+          treeblocks -= temp;
+          temp = 0;
+        } else {
+          temp -= treeblocks;
+          treeblocks = 0;
+        }
+        bg[slot].free_blocks_count = SWAP_LE32(temp);
 
-				// Fill out rest of group structure
-				used += j*TT.blockbits;
-				bg[slot].block_bitmap = SWAP_LE32(used++);
-				bg[slot].inode_bitmap = SWAP_LE32(used++);
-				bg[slot].inode_table = SWAP_LE32(used);
-				bg[slot].used_dirs_count = 0;  // (TODO)
-			}
-			xwrite(TT.fsfd, bg, TT.blocksize);
-		}
+        // Fill out rest of group structure
+        used += j*TT.blockbits;
+        bg[slot].block_bitmap = SWAP_LE32(used++);
+        bg[slot].inode_bitmap = SWAP_LE32(used++);
+        bg[slot].inode_table = SWAP_LE32(used);
+        bg[slot].used_dirs_count = 0;  // (TODO)
+      }
+      xwrite(TT.fsfd, bg, TT.blocksize);
+    }
 
-		// Now write out stuff that every block group has.
+    // Now write out stuff that every block group has.
 
-		// Write block usage bitmap
+    // Write block usage bitmap
 
-		start += 2 + itable;
-		memset(toybuf, 0, TT.blocksize);
-		bits_set(toybuf, 0, start);
-		bits_set(toybuf, end, TT.blockbits-end);
-		temp = TT.treeblocks - usedblocks;
-		if (temp) {
-			if (end-start > temp) temp = end-start;
-			bits_set(toybuf, start, temp);
-		}
-		xwrite(TT.fsfd, toybuf, TT.blocksize);
+    start += 2 + itable;
+    memset(toybuf, 0, TT.blocksize);
+    bits_set(toybuf, 0, start);
+    bits_set(toybuf, end, TT.blockbits-end);
+    temp = TT.treeblocks - usedblocks;
+    if (temp) {
+      if (end-start > temp) temp = end-start;
+      bits_set(toybuf, start, temp);
+    }
+    xwrite(TT.fsfd, toybuf, TT.blocksize);
 
-		// Write inode bitmap
-		memset(toybuf, 0, TT.blocksize);
-		j = 0;
-		if (!i) bits_set(toybuf, 0, j = INODES_RESERVED);
-		bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg);
-		temp = TT.treeinodes - usedinodes;
-		if (temp) {
-			if (slot-j > temp) temp = slot-j;
-			bits_set(toybuf, j, temp);
-		}
-		xwrite(TT.fsfd, toybuf, TT.blocksize);
+    // Write inode bitmap
+    memset(toybuf, 0, TT.blocksize);
+    j = 0;
+    if (!i) bits_set(toybuf, 0, j = INODES_RESERVED);
+    bits_set(toybuf, TT.inodespg, slot = TT.blockbits-TT.inodespg);
+    temp = TT.treeinodes - usedinodes;
+    if (temp) {
+      if (slot-j > temp) temp = slot-j;
+      bits_set(toybuf, j, temp);
+    }
+    xwrite(TT.fsfd, toybuf, TT.blocksize);
 
-		// Write inode table for this group (TODO)
-		for (j = 0; j<TT.inodespg; j++) {
-			slot = j % (TT.blocksize/sizeof(struct ext2_inode));
-			if (!slot) {
-				if (j) xwrite(TT.fsfd, in, TT.blocksize);
-				memset(in, 0, TT.blocksize);
-			}
-			if (!i && j<INODES_RESERVED) {
-				// Write root inode
-				if (j == 2) fill_inode(in+slot, dtb);
-			} else if (dti) {
-				fill_inode(in+slot, dti);
-				dti = treenext(dti);
-			}
-		}
-		xwrite(TT.fsfd, in, TT.blocksize);
+    // Write inode table for this group (TODO)
+    for (j = 0; j<TT.inodespg; j++) {
+      slot = j % (TT.blocksize/sizeof(struct ext2_inode));
+      if (!slot) {
+        if (j) xwrite(TT.fsfd, in, TT.blocksize);
+        memset(in, 0, TT.blocksize);
+      }
+      if (!i && j<INODES_RESERVED) {
+        // Write root inode
+        if (j == 2) fill_inode(in+slot, dtb);
+      } else if (dti) {
+        fill_inode(in+slot, dti);
+        dti = treenext(dti);
+      }
+    }
+    xwrite(TT.fsfd, in, TT.blocksize);
 
-		while (dtb) {
-			// TODO write index data block
-			// TODO write root directory data block
-			// TODO write directory data block
-			// TODO write file data block
-			put_zeroes(TT.blocksize);
-			start++;
-			if (start == end) break;
-		}
-		// Write data blocks (TODO)
-		put_zeroes((end-start) * TT.blocksize);
-	}
+    while (dtb) {
+      // TODO write index data block
+      // TODO write root directory data block
+      // TODO write directory data block
+      // TODO write file data block
+      put_zeroes(TT.blocksize);
+      start++;
+      if (start == end) break;
+    }
+    // Write data blocks (TODO)
+    put_zeroes((end-start) * TT.blocksize);
+  }
 }