diff options
Diffstat (limited to 'toys/mke2fs.c')
| -rw-r--r-- | toys/mke2fs.c | 18 |
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"); |