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/inode.c | 77 ++++++++++++++++++--------------------
1 files changed, 37 insertions(+), 40 deletions(-)
diff --git a/kernel/fs/adfs/inode.c b/kernel/fs/adfs/inode.c
index 66621e9..32620f4 100644
--- a/kernel/fs/adfs/inode.c
+++ b/kernel/fs/adfs/inode.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/adfs/inode.c
*
* Copyright (C) 1997-1999 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/writeback.h>
@@ -23,7 +20,8 @@
if (block >= inode->i_blocks)
goto abort_toobig;
- block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
+ block = __adfs_block_map(inode->i_sb, ADFS_I(inode)->indaddr,
+ block);
if (block)
map_bh(bh, inode->i_sb, block);
return 0;
@@ -97,7 +95,7 @@
return S_IFDIR | S_IXUGO | mode;
}
- switch (ADFS_I(inode)->filetype) {
+ switch (adfs_filetype(ADFS_I(inode)->loadaddr)) {
case 0xfc0: /* LinkFS */
return S_IFLNK|S_IRWXUGO;
@@ -129,29 +127,29 @@
* Convert Linux permission to ADFS attribute. We try to do the reverse
* of atts2mode, but there is not a 1:1 translation.
*/
-static int
-adfs_mode2atts(struct super_block *sb, struct inode *inode)
+static int adfs_mode2atts(struct super_block *sb, struct inode *inode,
+ umode_t ia_mode)
{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
umode_t mode;
int attr;
- struct adfs_sb_info *asb = ADFS_SB(sb);
/* FIXME: should we be able to alter a link? */
if (S_ISLNK(inode->i_mode))
return ADFS_I(inode)->attr;
+ /* Directories do not have read/write permissions on the media */
if (S_ISDIR(inode->i_mode))
- attr = ADFS_NDA_DIRECTORY;
- else
- attr = 0;
+ return ADFS_NDA_DIRECTORY;
- mode = inode->i_mode & asb->s_owner_mask;
+ attr = 0;
+ mode = ia_mode & asb->s_owner_mask;
if (mode & S_IRUGO)
attr |= ADFS_NDA_OWNER_READ;
if (mode & S_IWUGO)
attr |= ADFS_NDA_OWNER_WRITE;
- mode = inode->i_mode & asb->s_other_mask;
+ mode = ia_mode & asb->s_other_mask;
mode &= ~asb->s_owner_mask;
if (mode & S_IRUGO)
attr |= ADFS_NDA_PUBLIC_READ;
@@ -160,6 +158,8 @@
return attr;
}
+
+static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;
/*
* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
@@ -173,11 +173,9 @@
/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
* 01 Jan 1900 00:00:00 (RISC OS epoch)
*/
- static const s64 nsec_unix_epoch_diff_risc_os_epoch =
- 2208988800000000000LL;
s64 nsec;
- if (ADFS_I(inode)->stamped == 0)
+ if (!adfs_inode_is_stamped(inode))
goto cur_time;
high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
@@ -207,24 +205,23 @@
return;
}
-/*
- * Convert an Unix time to ADFS time. We only do this if the entry has a
- * time/date stamp already.
- */
-static void
-adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
+/* Convert an Unix time to ADFS time for an entry that is already stamped. */
+static void adfs_unix2adfs_time(struct inode *inode,
+ const struct timespec64 *ts)
{
- unsigned int high, low;
+ s64 cs, nsec = timespec64_to_ns(ts);
- if (ADFS_I(inode)->stamped) {
- /* convert 32-bit seconds to 40-bit centi-seconds */
- low = (secs & 255) * 100;
- high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;
+ /* convert from Unix to RISC OS epoch */
+ nsec += nsec_unix_epoch_diff_risc_os_epoch;
- ADFS_I(inode)->loadaddr = (high >> 24) |
- (ADFS_I(inode)->loadaddr & ~0xff);
- ADFS_I(inode)->execaddr = (low & 255) | (high << 8);
- }
+ /* convert from nanoseconds to centiseconds */
+ cs = div_s64(nsec, 10000000);
+
+ cs = clamp_t(s64, cs, 0, 0xffffffffff);
+
+ ADFS_I(inode)->loadaddr &= ~0xff;
+ ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff;
+ ADFS_I(inode)->execaddr = cs;
}
/*
@@ -250,7 +247,7 @@
inode->i_uid = ADFS_SB(sb)->s_uid;
inode->i_gid = ADFS_SB(sb)->s_gid;
- inode->i_ino = obj->file_id;
+ inode->i_ino = obj->indaddr;
inode->i_size = obj->size;
set_nlink(inode, 2);
inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
@@ -263,11 +260,10 @@
* for cross-directory renames.
*/
ADFS_I(inode)->parent_id = obj->parent_id;
+ ADFS_I(inode)->indaddr = obj->indaddr;
ADFS_I(inode)->loadaddr = obj->loadaddr;
ADFS_I(inode)->execaddr = obj->execaddr;
ADFS_I(inode)->attr = obj->attr;
- ADFS_I(inode)->filetype = obj->filetype;
- ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
inode->i_mode = adfs_atts2mode(sb, inode);
adfs_adfs2unix_time(&inode->i_mtime, inode);
@@ -320,10 +316,11 @@
if (ia_valid & ATTR_SIZE)
truncate_setsize(inode, attr->ia_size);
- if (ia_valid & ATTR_MTIME) {
- inode->i_mtime = attr->ia_mtime;
- adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
+ if (ia_valid & ATTR_MTIME && adfs_inode_is_stamped(inode)) {
+ adfs_unix2adfs_time(inode, &attr->ia_mtime);
+ adfs_adfs2unix_time(&inode->i_mtime, inode);
}
+
/*
* FIXME: should we make these == to i_mtime since we don't
* have the ability to represent them in our filesystem?
@@ -333,7 +330,7 @@
if (ia_valid & ATTR_CTIME)
inode->i_ctime = attr->ia_ctime;
if (ia_valid & ATTR_MODE) {
- ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
+ ADFS_I(inode)->attr = adfs_mode2atts(sb, inode, attr->ia_mode);
inode->i_mode = adfs_atts2mode(sb, inode);
}
@@ -358,7 +355,7 @@
struct object_info obj;
int ret;
- obj.file_id = inode->i_ino;
+ obj.indaddr = ADFS_I(inode)->indaddr;
obj.name_len = 0;
obj.parent_id = ADFS_I(inode)->parent_id;
obj.loadaddr = ADFS_I(inode)->loadaddr;
--
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