From 748e4f3d702def1a4bff191e0cf93b6a05340f01 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:41:34 +0000
Subject: [PATCH] add gpio led uart
---
kernel/fs/adfs/map.c | 261 +++++++++++++++++++++++++++++++++++++--------------
1 files changed, 189 insertions(+), 72 deletions(-)
diff --git a/kernel/fs/adfs/map.c b/kernel/fs/adfs/map.c
index 6935f05..a81de80 100644
--- a/kernel/fs/adfs/map.c
+++ b/kernel/fs/adfs/map.c
@@ -1,13 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/adfs/map.c
*
* Copyright (C) 1997-2002 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
-#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
#include <asm/unaligned.h>
#include "adfs.h"
@@ -67,58 +65,44 @@
* output of:
* gcc -D__KERNEL__ -O2 -I../../include -o - -S map.c
*/
-static int
-lookup_zone(const struct adfs_discmap *dm, const unsigned int idlen,
- const unsigned int frag_id, unsigned int *offset)
+static int lookup_zone(const struct adfs_discmap *dm, const unsigned int idlen,
+ const u32 frag_id, unsigned int *offset)
{
- const unsigned int mapsize = dm->dm_endbit;
+ const unsigned int endbit = dm->dm_endbit;
const u32 idmask = (1 << idlen) - 1;
- unsigned char *map = dm->dm_bh->b_data + 4;
+ unsigned char *map = dm->dm_bh->b_data;
unsigned int start = dm->dm_startbit;
- unsigned int mapptr;
+ unsigned int freelink, fragend;
u32 frag;
+
+ frag = GET_FRAG_ID(map, 8, idmask & 0x7fff);
+ freelink = frag ? 8 + frag : 0;
do {
frag = GET_FRAG_ID(map, start, idmask);
- mapptr = start + idlen;
- /*
- * find end of fragment
- */
- {
- __le32 *_map = (__le32 *)map;
- u32 v = le32_to_cpu(_map[mapptr >> 5]) >> (mapptr & 31);
- while (v == 0) {
- mapptr = (mapptr & ~31) + 32;
- if (mapptr >= mapsize)
- goto error;
- v = le32_to_cpu(_map[mapptr >> 5]);
- }
+ fragend = find_next_bit_le(map, endbit, start + idlen);
+ if (fragend >= endbit)
+ goto error;
- mapptr += 1 + ffz(~v);
+ if (start == freelink) {
+ freelink += frag & 0x7fff;
+ } else if (frag == frag_id) {
+ unsigned int length = fragend + 1 - start;
+
+ if (*offset < length)
+ return start + *offset;
+ *offset -= length;
}
- if (frag == frag_id)
- goto found;
-again:
- start = mapptr;
- } while (mapptr < mapsize);
+ start = fragend + 1;
+ } while (start < endbit);
return -1;
error:
printk(KERN_ERR "adfs: oversized fragment 0x%x at 0x%x-0x%x\n",
- frag, start, mapptr);
+ frag, start, fragend);
return -1;
-
-found:
- {
- int length = mapptr - start;
- if (*offset >= length) {
- *offset -= length;
- goto again;
- }
- }
- return start + *offset;
}
/*
@@ -130,12 +114,12 @@
static unsigned int
scan_free_map(struct adfs_sb_info *asb, struct adfs_discmap *dm)
{
- const unsigned int mapsize = dm->dm_endbit + 32;
+ const unsigned int endbit = dm->dm_endbit;
const unsigned int idlen = asb->s_idlen;
const unsigned int frag_idlen = idlen <= 15 ? idlen : 15;
const u32 idmask = (1 << frag_idlen) - 1;
unsigned char *map = dm->dm_bh->b_data;
- unsigned int start = 8, mapptr;
+ unsigned int start = 8, fragend;
u32 frag;
unsigned long total = 0;
@@ -154,29 +138,13 @@
do {
start += frag;
- /*
- * get fragment id
- */
frag = GET_FRAG_ID(map, start, idmask);
- mapptr = start + idlen;
- /*
- * find end of fragment
- */
- {
- __le32 *_map = (__le32 *)map;
- u32 v = le32_to_cpu(_map[mapptr >> 5]) >> (mapptr & 31);
- while (v == 0) {
- mapptr = (mapptr & ~31) + 32;
- if (mapptr >= mapsize)
- goto error;
- v = le32_to_cpu(_map[mapptr >> 5]);
- }
+ fragend = find_next_bit_le(map, endbit, start + idlen);
+ if (fragend >= endbit)
+ goto error;
- mapptr += 1 + ffz(~v);
- }
-
- total += mapptr - start;
+ total += fragend + 1 - start;
} while (frag >= idlen + 1);
if (frag != 0)
@@ -188,9 +156,8 @@
return 0;
}
-static int
-scan_map(struct adfs_sb_info *asb, unsigned int zone,
- const unsigned int frag_id, unsigned int mapoff)
+static int scan_map(struct adfs_sb_info *asb, unsigned int zone,
+ const u32 frag_id, unsigned int mapoff)
{
const unsigned int idlen = asb->s_idlen;
struct adfs_discmap *dm, *dm_end;
@@ -226,10 +193,10 @@
* total_free = E(free_in_zone_n)
* nzones
*/
-unsigned int
-adfs_map_free(struct super_block *sb)
+void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf)
{
struct adfs_sb_info *asb = ADFS_SB(sb);
+ struct adfs_discrecord *dr = adfs_map_discrecord(asb->s_map);
struct adfs_discmap *dm;
unsigned int total = 0;
unsigned int zone;
@@ -241,12 +208,13 @@
total += scan_free_map(asb, dm++);
} while (--zone > 0);
- return signed_asl(total, asb->s_map2blk);
+ buf->f_blocks = adfs_disc_size(dr) >> sb->s_blocksize_bits;
+ buf->f_files = asb->s_ids_per_zone * asb->s_map_size;
+ buf->f_bavail =
+ buf->f_bfree = signed_asl(total, asb->s_map2blk);
}
-int
-adfs_map_lookup(struct super_block *sb, unsigned int frag_id,
- unsigned int offset)
+int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset)
{
struct adfs_sb_info *asb = ADFS_SB(sb);
unsigned int zone, mapoff;
@@ -288,3 +256,152 @@
frag_id, zone, asb->s_map_size);
return 0;
}
+
+static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
+{
+ unsigned int v0, v1, v2, v3;
+ int i;
+
+ v0 = v1 = v2 = v3 = 0;
+ for (i = sb->s_blocksize - 4; i; i -= 4) {
+ v0 += map[i] + (v3 >> 8);
+ v3 &= 0xff;
+ v1 += map[i + 1] + (v0 >> 8);
+ v0 &= 0xff;
+ v2 += map[i + 2] + (v1 >> 8);
+ v1 &= 0xff;
+ v3 += map[i + 3] + (v2 >> 8);
+ v2 &= 0xff;
+ }
+ v0 += v3 >> 8;
+ v1 += map[1] + (v0 >> 8);
+ v2 += map[2] + (v1 >> 8);
+ v3 += map[3] + (v2 >> 8);
+
+ return v0 ^ v1 ^ v2 ^ v3;
+}
+
+static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
+{
+ unsigned char crosscheck = 0, zonecheck = 1;
+ int i;
+
+ for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
+ unsigned char *map;
+
+ map = dm[i].dm_bh->b_data;
+
+ if (adfs_calczonecheck(sb, map) != map[0]) {
+ adfs_error(sb, "zone %d fails zonecheck", i);
+ zonecheck = 0;
+ }
+ crosscheck ^= map[3];
+ }
+ if (crosscheck != 0xff)
+ adfs_error(sb, "crosscheck != 0xff");
+ return crosscheck == 0xff && zonecheck;
+}
+
+/*
+ * Layout the map - the first zone contains a copy of the disc record,
+ * and the last zone must be limited to the size of the filesystem.
+ */
+static void adfs_map_layout(struct adfs_discmap *dm, unsigned int nzones,
+ struct adfs_discrecord *dr)
+{
+ unsigned int zone, zone_size;
+ u64 size;
+
+ zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
+
+ dm[0].dm_bh = NULL;
+ dm[0].dm_startblk = 0;
+ dm[0].dm_startbit = 32 + ADFS_DR_SIZE_BITS;
+ dm[0].dm_endbit = 32 + zone_size;
+
+ for (zone = 1; zone < nzones; zone++) {
+ dm[zone].dm_bh = NULL;
+ dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
+ dm[zone].dm_startbit = 32;
+ dm[zone].dm_endbit = 32 + zone_size;
+ }
+
+ size = adfs_disc_size(dr) >> dr->log2bpmb;
+ size -= (nzones - 1) * zone_size - ADFS_DR_SIZE_BITS;
+ dm[nzones - 1].dm_endbit = 32 + size;
+}
+
+static int adfs_map_read(struct adfs_discmap *dm, struct super_block *sb,
+ unsigned int map_addr, unsigned int nzones)
+{
+ unsigned int zone;
+
+ for (zone = 0; zone < nzones; zone++) {
+ dm[zone].dm_bh = sb_bread(sb, map_addr + zone);
+ if (!dm[zone].dm_bh)
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void adfs_map_relse(struct adfs_discmap *dm, unsigned int nzones)
+{
+ unsigned int zone;
+
+ for (zone = 0; zone < nzones; zone++)
+ brelse(dm[zone].dm_bh);
+}
+
+struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
+{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+ struct adfs_discmap *dm;
+ unsigned int map_addr, zone_size, nzones;
+ int ret;
+
+ nzones = dr->nzones | dr->nzones_high << 8;
+ zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
+
+ asb->s_idlen = dr->idlen;
+ asb->s_map_size = nzones;
+ asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
+ asb->s_log2sharesize = dr->log2sharesize;
+ asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
+
+ map_addr = (nzones >> 1) * zone_size -
+ ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
+ map_addr = signed_asl(map_addr, asb->s_map2blk);
+
+ dm = kmalloc_array(nzones, sizeof(*dm), GFP_KERNEL);
+ if (dm == NULL) {
+ adfs_error(sb, "not enough memory");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ adfs_map_layout(dm, nzones, dr);
+
+ ret = adfs_map_read(dm, sb, map_addr, nzones);
+ if (ret) {
+ adfs_error(sb, "unable to read map");
+ goto error_free;
+ }
+
+ if (adfs_checkmap(sb, dm))
+ return dm;
+
+ adfs_error(sb, "map corrupted");
+
+error_free:
+ adfs_map_relse(dm, nzones);
+ kfree(dm);
+ return ERR_PTR(-EIO);
+}
+
+void adfs_free_map(struct super_block *sb)
+{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ adfs_map_relse(asb->s_map, asb->s_map_size);
+ kfree(asb->s_map);
+}
--
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