From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/fs/kernfs/file.c | 93 +++++++++++++++++++---------------------------
1 files changed, 39 insertions(+), 54 deletions(-)
diff --git a/kernel/fs/kernfs/file.c b/kernel/fs/kernfs/file.c
index ae948aa..c757193 100644
--- a/kernel/fs/kernfs/file.c
+++ b/kernel/fs/kernfs/file.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/file.c - kernfs file implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/fs.h>
@@ -15,6 +14,7 @@
#include <linux/pagemap.h>
#include <linux/sched/mm.h>
#include <linux/fsnotify.h>
+#include <linux/uio.h>
#include "kernfs-internal.h"
@@ -181,11 +181,10 @@
* it difficult to use seq_file. Implement simplistic custom buffering for
* bin files.
*/
-static ssize_t kernfs_file_direct_read(struct kernfs_open_file *of,
- char __user *user_buf, size_t count,
- loff_t *ppos)
+static ssize_t kernfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- ssize_t len = min_t(size_t, count, PAGE_SIZE);
+ struct kernfs_open_file *of = kernfs_of(iocb->ki_filp);
+ ssize_t len = min_t(size_t, iov_iter_count(iter), PAGE_SIZE);
const struct kernfs_ops *ops;
char *buf;
@@ -211,7 +210,7 @@
of->event = atomic_read(&of->kn->attr.open->event);
ops = kernfs_ops(of->kn);
if (ops->read)
- len = ops->read(of, buf, len, *ppos);
+ len = ops->read(of, buf, len, iocb->ki_pos);
else
len = -EINVAL;
@@ -221,12 +220,12 @@
if (len < 0)
goto out_free;
- if (copy_to_user(user_buf, buf, len)) {
+ if (copy_to_iter(buf, len, iter) != len) {
len = -EFAULT;
goto out_free;
}
- *ppos += len;
+ iocb->ki_pos += len;
out_free:
if (buf == of->prealloc_buf)
@@ -236,31 +235,14 @@
return len;
}
-/**
- * kernfs_fop_read - kernfs vfs read callback
- * @file: file pointer
- * @user_buf: data to write
- * @count: number of bytes
- * @ppos: starting offset
- */
-static ssize_t kernfs_fop_read(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
+static ssize_t kernfs_fop_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- struct kernfs_open_file *of = kernfs_of(file);
-
- if (of->kn->flags & KERNFS_HAS_SEQ_SHOW)
- return seq_read(file, user_buf, count, ppos);
- else
- return kernfs_file_direct_read(of, user_buf, count, ppos);
+ if (kernfs_of(iocb->ki_filp)->kn->flags & KERNFS_HAS_SEQ_SHOW)
+ return seq_read_iter(iocb, iter);
+ return kernfs_file_read_iter(iocb, iter);
}
-/**
- * kernfs_fop_write - kernfs vfs write callback
- * @file: file pointer
- * @user_buf: data to write
- * @count: number of bytes
- * @ppos: starting offset
- *
+/*
* Copy data in from userland and pass it to the matching kernfs write
* operation.
*
@@ -270,20 +252,18 @@
* modify only the the value you're changing, then write entire buffer
* back.
*/
-static ssize_t kernfs_fop_write(struct file *file, const char __user *user_buf,
- size_t count, loff_t *ppos)
+static ssize_t kernfs_fop_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- struct kernfs_open_file *of = kernfs_of(file);
+ struct kernfs_open_file *of = kernfs_of(iocb->ki_filp);
+ ssize_t len = iov_iter_count(iter);
const struct kernfs_ops *ops;
- ssize_t len;
char *buf;
if (of->atomic_write_len) {
- len = count;
if (len > of->atomic_write_len)
return -E2BIG;
} else {
- len = min_t(size_t, count, PAGE_SIZE);
+ len = min_t(size_t, len, PAGE_SIZE);
}
buf = of->prealloc_buf;
@@ -294,7 +274,7 @@
if (!buf)
return -ENOMEM;
- if (copy_from_user(buf, user_buf, len)) {
+ if (copy_from_iter(buf, len, iter) != len) {
len = -EFAULT;
goto out_free;
}
@@ -313,7 +293,7 @@
ops = kernfs_ops(of->kn);
if (ops->write)
- len = ops->write(of, buf, len, *ppos);
+ len = ops->write(of, buf, len, iocb->ki_pos);
else
len = -EINVAL;
@@ -321,7 +301,7 @@
mutex_unlock(&of->mutex);
if (len > 0)
- *ppos += len;
+ iocb->ki_pos += len;
out_free:
if (buf == of->prealloc_buf)
@@ -653,9 +633,9 @@
* The following is done to give a different lockdep key to
* @of->mutex for files which implement mmap. This is a rather
* crude way to avoid false positive lockdep warning around
- * mm->mmap_sem - mmap nests @of->mutex under mm->mmap_sem and
+ * mm->mmap_lock - mmap nests @of->mutex under mm->mmap_lock and
* reading /sys/block/sda/trace/act_mask grabs sr_mutex, under
- * which mm->mmap_sem nests, while holding @of->mutex. As each
+ * which mm->mmap_lock nests, while holding @of->mutex. As each
* open file has a separate mutex, it's okay as long as those don't
* happen on the same file. At this point, we can't easily give
* each file a separate locking class. Let's differentiate on
@@ -674,7 +654,7 @@
/*
* Write path needs to atomic_write_len outside active reference.
- * Cache it in open_file. See kernfs_fop_write() for details.
+ * Cache it in open_file. See kernfs_fop_write_iter() for details.
*/
of->atomic_write_len = ops->atomic_write_len;
@@ -884,7 +864,9 @@
list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
struct kernfs_node *parent;
+ struct inode *p_inode = NULL;
struct inode *inode;
+ struct qstr name;
/*
* We want fsnotify_modify() on @kn but as the
@@ -892,26 +874,27 @@
* have the matching @file available. Look up the inodes
* and generate the events manually.
*/
- inode = ilookup(info->sb, kn->id.ino);
+ inode = ilookup(info->sb, kernfs_ino(kn));
if (!inode)
continue;
+ name = (struct qstr)QSTR_INIT(kn->name, strlen(kn->name));
parent = kernfs_get_parent(kn);
if (parent) {
- struct inode *p_inode;
-
- p_inode = ilookup(info->sb, parent->id.ino);
+ p_inode = ilookup(info->sb, kernfs_ino(parent));
if (p_inode) {
- fsnotify(p_inode, FS_MODIFY | FS_EVENT_ON_CHILD,
- inode, FSNOTIFY_EVENT_INODE, kn->name, 0);
+ fsnotify(FS_MODIFY | FS_EVENT_ON_CHILD,
+ inode, FSNOTIFY_EVENT_INODE,
+ p_inode, &name, inode, 0);
iput(p_inode);
}
kernfs_put(parent);
}
- fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
- kn->name, 0);
+ if (!p_inode)
+ fsnotify_inode(inode, FS_MODIFY);
+
iput(inode);
}
@@ -958,14 +941,16 @@
EXPORT_SYMBOL_GPL(kernfs_notify);
const struct file_operations kernfs_file_fops = {
- .read = kernfs_fop_read,
- .write = kernfs_fop_write,
+ .read_iter = kernfs_fop_read_iter,
+ .write_iter = kernfs_fop_write_iter,
.llseek = generic_file_llseek,
.mmap = kernfs_fop_mmap,
.open = kernfs_fop_open,
.release = kernfs_fop_release,
.poll = kernfs_fop_poll,
.fsync = noop_fsync,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
};
/**
@@ -1009,7 +994,7 @@
#ifdef CONFIG_DEBUG_LOCK_ALLOC
if (key) {
- lockdep_init_map(&kn->dep_map, "kn->count", key, 0);
+ lockdep_init_map(&kn->dep_map, "kn->active", key, 0);
kn->flags |= KERNFS_LOCKDEP;
}
#endif
--
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