ext3のディレクトリエントリの削除

ext3のディレクトリエントリの削除
* fs/ext3/namei.c
/*
* ext3_delete_entry deletes a directory entry by merging it with the
* previous entry
*/
static int ext3_delete_entry (handle_t *handle,
struct inode * dir,
struct ext3_dir_entry_2 * de_del,
struct buffer_head * bh)
{
struct ext3_dir_entry_2 * de, * pde;
int i;

i = 0;
pde = NULL;
de = (struct ext3_dir_entry_2 *) bh->b_data;
while (i < bh->b_size) {
if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
return -EIO;
if (de == de_del) {
int err;

BUFFER_TRACE(bh, "get_write_access");
err = ext3_journal_get_write_access(handle, bh);
if (err)
goto journal_error;

if (pde)
pde->rec_len = ext3_rec_len_to_disk(
ext3_rec_len_from_disk(pde->rec_len) +
ext3_rec_len_from_disk(de->rec_len));
else
de->inode = 0;
dir->i_version++;
BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
err = ext3_journal_dirty_metadata(handle, bh);
if (err) {
journal_error:
ext3_std_error(dir->i_sb, err);
return err;
}
return 0;
}
i += ext3_rec_len_from_disk(de->rec_len);
pde = de;
de = ext3_next_entry(de);
}
return -ENOENT;
}