From 4f2d40ca35e0e39886dc881d06256fc25ba27a77 Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Thu, 16 Jul 2026 12:20:57 +0200
Subject: fs rewrite stage 2: inodes + root directory (block-based, persistent)

- fs.asm: a real block filesystem on the persistent block device - superblock,
  block/inode bitmaps, a 32-entry inode table (type, size, 8 direct block
  pointers -> files up to 2 KiB), and a root directory of 16-byte entries.
  Metadata cached in WRAMX; one-block data cache streams file/dir blocks.
- same syscall interface (open/getb/putb/list/remove) -> tools unchanged;
  ls now enumerates until flist() runs out (16 files, was hardcoded 8).
- old 8-slot WRAM FS removed; cart RAM partitioned: process banks 0-7, disk 8-11.
- two register-clobber bugs fixed: alloc_block/alloc_inode returned the
  bitmap-block number (write_bitmap clobbers C); db_use loaded the wrong block
  on a transition (db_flush->write_block clobbers C) -> multi-block files broke.
- verified: 10+ files, multi-block (300-byte) files, delete, and persistence
  across reboots. Debug 'blk' disk tool retained (fill/peek).
- README: document the block filesystem.
---
 c/blk.c  |  2 +-
 c/gbos.h |  1 +
 c/libc.s | 10 +++++++++-
 c/ls.c   |  8 +++-----
 4 files changed, 14 insertions(+), 7 deletions(-)

(limited to 'c')

diff --git a/c/blk.c b/c/blk.c
index adf2a58..36839c0 100644
--- a/c/blk.c
+++ b/c/blk.c
@@ -6,7 +6,7 @@ void main(void) {
     if (argc >= 3 && argv[0][0] == 'f') {
         bfill(atou(argv[1]), atou(argv[2]));
     } else if (argc >= 2 && argv[0][0] == 'p') {
-        putu(bpeek(atou(argv[1]))); nl();
+        putu(bpeek2(atou(argv[1]), argc>=3?atou(argv[2]):0)); nl();
     } else {
         puts("usage: blk fill <n> <v> | blk peek <n>"); nl();
     }
diff --git a/c/gbos.h b/c/gbos.h
index 03a91de..6badd16 100644
--- a/c/gbos.h
+++ b/c/gbos.h
@@ -45,4 +45,5 @@ void          yield(void);
 unsigned char reap(void);                   /* reap a finished bg job, or 0   */
 void          bfill(unsigned char block, unsigned char byte); /* [debug] disk */
 unsigned char bpeek(unsigned char block);                     /* [debug] disk */
+unsigned char bpeek2(unsigned char block, unsigned char off);
 #endif
diff --git a/c/libc.s b/c/libc.s
index 5b81dca..c245bbd 100644
--- a/c/libc.s
+++ b/c/libc.s
@@ -200,7 +200,7 @@ _reap:
 	rst	#0x30
 	ret
 
-	.globl _bfill, _bpeek
+	.globl _bfill, _bpeek, _bpeek2
 	;; void bfill(unsigned char block /*A*/, unsigned char byte /*E*/)
 _bfill:
 	ld	b, a
@@ -210,6 +210,14 @@ _bfill:
 	;; unsigned char bpeek(unsigned char block /*A*/) -> A
 _bpeek:
 	ld	b, a
+	ld	e, #0
 	ld	c, #24			; SYS_BPEEK
 	rst	#0x30
 	ret
+	;; unsigned char bpeek2(unsigned char block /*A*/, unsigned char off /*E*/) -> A
+_bpeek2:
+	ld	b, a
+	ld	c, #24			; SYS_BPEEK (off already in E)
+	rst	#0x30
+	ret
+
diff --git a/c/ls.c b/c/ls.c
index f7e5161..5d5ce43 100644
--- a/c/ls.c
+++ b/c/ls.c
@@ -1,9 +1,7 @@
 #include "gbos.h"
-/* ls: list files in the RAM filesystem. */
+/* ls: list files in the filesystem. */
 void main(void) {
-    char name[9];
+    char name[16];
     unsigned char i;
-    for (i = 0; i < 8; i++) {
-        if (flist(i, name)) { name[8] = 0; puts(name); nl(); }
-    }
+    for (i = 0; flist(i, name); i++) { name[15] = 0; puts(name); nl(); }
 }
-- 
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