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- fat.rs: VOL: Option<Volume> → VOLS: Vec<Volume>; try_mount() returns
a Volume per disk and init() mounts every valid FAT32 volume found.
Volume UID = sanitized uppercase label + 8-hex volume serial
(e.g. RSDOS-5BD1E55F): unique per format, stable across reboots,
human-recognizable, machine-parseable (^[A-Z0-9_]+-[0-9A-F]{8}$);
cloned volumes get a -N suffix. Public ops take a vol index and
select it (select_vol also picks the backing AHCI disk), matching
the ahci::select pattern
- fs.rs: /disk is now a plain directory whose children are one Disk
node per mounted volume, named by UID; DiskInfo carries vol
- LFN fix: entries are stored last-first on disk — both the writer
(head-entry first) and reader (append in disk order) were reversed
and cancelled out for ≤13-char names; multi-entry names (>13 chars)
read back mangled (e.g. 'from-kernel.txt' as 'xt'). Writer now
places seq=1 closest to the SFN and seq=N|0x40 first; reader places
chunks by sequence number and trims at the first NUL. Verified with
a 25-char filename round trip: kernel ls/cat correct, mtools shows
the full LFN, fsck clean on both volumes
- test-disk.sh: test file renamed to disk-test-.txt (>13 chars,
exercises multi-entry LFN); UID discovered from the boot log; QEMU
stdio redirected to a log file + EXIT trap so an orphaned QEMU can
never hang a piped caller (it previously did, 400s)
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The kernel previously started only AHCI port 0, so any launch where the
firmware/QEMU put something else on port 0 (e.g. the ESP from an implicit
-drive file=fat:rw:esp) left the real disk unnoticed: 'unsupported sector
size 0' and no mount.
- ahci.rs: enumerate CAP.NP/PI ports, start every port that links up
(empty ports settle at DET=0 and are skipped quickly), keep up to 8
disks, and expose disk_count()/select() for the filesystem
- fat.rs: try each disk in port order and mount the first valid FAT32
volume; non-FAT disks are logged and skipped
- scripts/boot.sh: attach the data disk on ide.0 and the ESP on ide.1
(DISK_IMG env var, default /tmp/disk.img), matching the Makefile
- Verified with the disk on port 0 (Makefile style), port 5 (old-style
command line), and with the ESP on port 0; fsck.fat stays clean
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- ahci.rs: polling AHCI on PCI class 1/6/1, bus mastering + ABAR map,
port 0 up, IDENTIFY + READ/WRITE DMA EXT through one 4KiB DMA buffer
- fat.rs: BPB parse, whole-FAT RAM cache with write-back to both copies,
LFN read/write, dirs, multi-cluster files, FSInfo free-count sync,
space-padded dot entries ('..' = cluster 0 under root), fsck-clean
- fs.rs: /disk mount node + 24-slot ephemeral node pool; ls/cat/hexdump/
echo/mkdir/touch/rm/edit all work on disk paths unchanged
- QEMU: explicit bus assignment (disk=ide.0, ESP=ide.1); the implicit
fat:rw:esp drive was stealing AHCI port 0
- Debugged against QEMU source: header DW0 is CFL in bits 4:0 / PRDTL in
bits 31:16 (Linux libahci layout), FIS count at bytes 12-13, device at
byte 7; QEMU rejects H2D FIS flags bits 6:4, so direction is the
header W bit only
- Verified: full shell round-trip on /disk, reboot persistence (poweroff
then mdir/mtype and a fresh boot), fsck.fat clean
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