foundry

Stage 8: ext2 driver (0.8.0)

Hand-written ext2 (src/fs/ext2.rs, no crate) plugged into the VFS:
superblock, group descriptors, bitmaps, inodes with direct/single/
double/triple indirect blocks, directories with file types, fast and
slow symlinks; 1 KiB and 4 KiB blocks, revision 0 and 1. Writes:
create, write/append, truncate, mkdir, unlink, rmdir with bitmap
allocation and free counts in the superblock and group descriptors.

- VFS: symlink following (ELOOP after 8), lookup_nofollow, readlink;
  Stat gains mode; new readlink syscall (89); mount_disks probes ext2
  (magic 0xEF53) before FAT and mounts unpartitioned disks
- build.rs: mke2fs -d images from disk2/ (big.txt, sparse.bin,
  symlinks): ext2.img (raw, vdb -> /mnt/disk1 = C:), plus 4K-block
  and revision-0 images for tests
- ls -l shows permissions and symlink targets
- tests/ext2.rs (11 tests); scripts/ext2-check.sh runs Rustbelt on
  writable copies, then host e2fsck -fn and debugfs
- self-test and boot.png use drive C:; README ext2 section

1 file changed, 10 insertions, 0 deletions

@@ -24,6 +24,16 @@ run --trace cat B:/notes/todo.txt start sleep 1 jobs wait+cd C:+ls+cat hello-link+grep "line 12345" big.txt+cp B:/notes/todo.txt C:/todo.txt+cat C:/todo.txt | grep -i ext2+md C:/made-here+echo written by Rustbelt > C:/made-here/note.txt+type C:/made-here/note.txt+ls -l C:/ run evil nosuchprogram cd Q: