From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/file_table.c | 26 +++++++++++++++++---------
1 files changed, 17 insertions(+), 9 deletions(-)
diff --git a/kernel/fs/file_table.c b/kernel/fs/file_table.c
index 6a71563..7a3b4a7 100644
--- a/kernel/fs/file_table.c
+++ b/kernel/fs/file_table.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/file_table.c
*
@@ -79,14 +80,14 @@
*/
#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
int proc_nr_files(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
files_stat.nr_files = get_nr_files();
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
#else
int proc_nr_files(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
return -ENOSYS;
}
@@ -197,6 +198,7 @@
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_wb_err = filemap_sample_wb_err(file->f_mapping);
+ file->f_sb_err = file_sample_sb_err(file);
if ((file->f_mode & FMODE_READ) &&
likely(fop->read || fop->read_iter))
file->f_mode |= FMODE_CAN_READ;
@@ -255,6 +257,7 @@
struct dentry *dentry = file->f_path.dentry;
struct vfsmount *mnt = file->f_path.mnt;
struct inode *inode = file->f_inode;
+ fmode_t mode = file->f_mode;
if (unlikely(!(file->f_mode & FMODE_OPENED)))
goto out;
@@ -277,18 +280,20 @@
if (file->f_op->release)
file->f_op->release(inode, file);
if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL &&
- !(file->f_mode & FMODE_PATH))) {
+ !(mode & FMODE_PATH))) {
cdev_put(inode->i_cdev);
}
fops_put(file->f_op);
put_pid(file->f_owner.pid);
- if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+ if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_dec(inode);
- if (file->f_mode & FMODE_WRITER) {
+ if (mode & FMODE_WRITER) {
put_write_access(inode);
__mnt_drop_write(mnt);
}
dput(dentry);
+ if (unlikely(mode & FMODE_NEED_UNMOUNT))
+ dissolve_on_fput(mnt);
mntput(mnt);
out:
file_free(file);
@@ -323,6 +328,7 @@
{
delayed_fput(NULL);
}
+EXPORT_SYMBOL_GPL(flush_delayed_fput);
static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput);
@@ -333,7 +339,7 @@
if (likely(!in_interrupt() && !(task->flags & PF_KTHREAD))) {
init_task_work(&file->f_u.fu_rcuhead, ____fput);
- if (!task_work_add(task, &file->f_u.fu_rcuhead, true))
+ if (!task_work_add(task, &file->f_u.fu_rcuhead, TWA_RESUME))
return;
/*
* After this task has run exit_task_work(),
@@ -370,6 +376,7 @@
}
EXPORT_SYMBOL(fput);
+EXPORT_SYMBOL(__fput_sync);
void __init files_init(void)
{
@@ -385,10 +392,11 @@
void __init files_maxfiles_init(void)
{
unsigned long n;
- unsigned long memreserve = (totalram_pages - nr_free_pages()) * 3/2;
+ unsigned long nr_pages = totalram_pages();
+ unsigned long memreserve = (nr_pages - nr_free_pages()) * 3/2;
- memreserve = min(memreserve, totalram_pages - 1);
- n = ((totalram_pages - memreserve) * (PAGE_SIZE / 1024)) / 10;
+ memreserve = min(memreserve, nr_pages - 1);
+ n = ((nr_pages - memreserve) * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
}
--
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