aboutsummaryrefslogtreecommitdiff
path: root/toys/mke2fs.c
diff options
context:
space:
mode:
Diffstat (limited to 'toys/mke2fs.c')
-rw-r--r--toys/mke2fs.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/toys/mke2fs.c b/toys/mke2fs.c
index 30612ee8..b102a2fe 100644
--- a/toys/mke2fs.c
+++ b/toys/mke2fs.c
@@ -7,6 +7,7 @@
#include "toys.h"
+// Shortcut to our global data structure, since we use it so much.
#define TT toy.mke2fs
#define INODES_RESERVED 10
@@ -26,13 +27,16 @@ 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;
- // Fill out index blocks.
+ // Fill out index blocks in inode.
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;
@@ -131,7 +135,7 @@ static void check_treelinks(struct dirtree *tree)
// On the other hand, we have 128 bits to come up with a unique identifier, of
// which 6 have a defined value. /dev/urandom it is.
-static void fake_uuid(char *uuid)
+static void create_uuid(char *uuid)
{
// Read 128 random bits
int fd = xopen("/dev/urandom", O_RDONLY);
@@ -206,7 +210,7 @@ static void init_superblock(struct ext2_superblock *sb)
sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
- fake_uuid(sb->uuid);
+ create_uuid(sb->uuid);
// TODO If we're called as mke3fs or mkfs.ext3, do a journal.
@@ -331,13 +335,17 @@ static void fill_inode(struct ext2_inode *in, struct dirtree *this)
// in->faddr
}
+// Works like an archiver.
+// The first argument is the name of the file to create. If it already
+// exists, that size will be used.
+
int mke2fs_main(void)
{
int i, temp;
off_t length;
uint32_t usedblocks, usedinodes, dtiblk, dtbblk;
struct dirtree *dti, *dtb;
-
+
// Handle command line arguments.
if (toys.optargs[1]) {
@@ -363,7 +371,7 @@ int mke2fs_main(void)
if (TT.gendir) {
strncpy(toybuf, TT.gendir, sizeof(toybuf));
- dti = read_dirtree(toybuf, NULL);
+ dti = dirtree_read(toybuf, NULL, NULL);
} else {
dti = xzalloc(sizeof(struct dirtree)+11);
strcpy(dti->name, "lost+found");