From 08f87f769b595151be1afeff53e144f543faa614 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 06 Dec 2023 09:51:13 +0000
Subject: [PATCH] add dts config
---
kernel/fs/autofs/expire.c | 115 ++++++++++++++++++---------------------------------------
1 files changed, 36 insertions(+), 79 deletions(-)
diff --git a/kernel/fs/autofs/expire.c b/kernel/fs/autofs/expire.c
index 1a6b88a..a1c7701 100644
--- a/kernel/fs/autofs/expire.c
+++ b/kernel/fs/autofs/expire.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
* Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
* Copyright 2001-2006 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
*/
-#include <linux/delay.h>
#include "autofs_i.h"
/* Check if a dentry can be expired */
@@ -74,6 +70,27 @@
return status;
}
+/* p->d_lock held */
+static struct dentry *positive_after(struct dentry *p, struct dentry *child)
+{
+ if (child)
+ child = list_next_entry(child, d_child);
+ else
+ child = list_first_entry(&p->d_subdirs, struct dentry, d_child);
+
+ list_for_each_entry_from(child, &p->d_subdirs, d_child) {
+ spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
+ if (simple_positive(child)) {
+ dget_dlock(child);
+ spin_unlock(&child->d_lock);
+ return child;
+ }
+ spin_unlock(&child->d_lock);
+ }
+
+ return NULL;
+}
+
/*
* Calculate and dget next entry in the subdirs list under root.
*/
@@ -81,43 +98,14 @@
struct dentry *root)
{
struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
- struct list_head *next;
struct dentry *q;
spin_lock(&sbi->lookup_lock);
spin_lock(&root->d_lock);
-
- if (prev)
- next = prev->d_child.next;
- else {
- prev = dget_dlock(root);
- next = prev->d_subdirs.next;
- }
-
-cont:
- if (next == &root->d_subdirs) {
- spin_unlock(&root->d_lock);
- spin_unlock(&sbi->lookup_lock);
- dput(prev);
- return NULL;
- }
-
- q = list_entry(next, struct dentry, d_child);
-
- spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED);
- /* Already gone or negative dentry (under construction) - try next */
- if (!d_count(q) || !simple_positive(q)) {
- spin_unlock(&q->d_lock);
- next = q->d_child.next;
- goto cont;
- }
- dget_dlock(q);
- spin_unlock(&q->d_lock);
+ q = positive_after(root, prev);
spin_unlock(&root->d_lock);
spin_unlock(&sbi->lookup_lock);
-
dput(prev);
-
return q;
}
@@ -128,59 +116,28 @@
struct dentry *root)
{
struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
- struct list_head *next;
- struct dentry *p, *ret;
+ struct dentry *p = prev, *ret = NULL, *d = NULL;
if (prev == NULL)
return dget(root);
spin_lock(&sbi->lookup_lock);
-relock:
- p = prev;
spin_lock(&p->d_lock);
-again:
- next = p->d_subdirs.next;
- if (next == &p->d_subdirs) {
- while (1) {
- struct dentry *parent;
+ while (1) {
+ struct dentry *parent;
- if (p == root) {
- spin_unlock(&p->d_lock);
- spin_unlock(&sbi->lookup_lock);
- dput(prev);
- return NULL;
- }
-
- parent = p->d_parent;
- if (!spin_trylock(&parent->d_lock)) {
- spin_unlock(&p->d_lock);
- cpu_chill();
- goto relock;
- }
- spin_unlock(&p->d_lock);
- next = p->d_child.next;
- p = parent;
- if (next != &parent->d_subdirs)
- break;
- }
- }
- ret = list_entry(next, struct dentry, d_child);
-
- spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED);
- /* Negative dentry - try next */
- if (!simple_positive(ret)) {
+ ret = positive_after(p, d);
+ if (ret || p == root)
+ break;
+ parent = p->d_parent;
spin_unlock(&p->d_lock);
- lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
- p = ret;
- goto again;
+ spin_lock(&parent->d_lock);
+ d = p;
+ p = parent;
}
- dget_dlock(ret);
- spin_unlock(&ret->d_lock);
spin_unlock(&p->d_lock);
spin_unlock(&sbi->lookup_lock);
-
dput(prev);
-
return ret;
}
@@ -254,7 +211,7 @@
}
} else {
struct autofs_info *ino = autofs_dentry_ino(p);
- unsigned int ino_count = atomic_read(&ino->count);
+ unsigned int ino_count = READ_ONCE(ino->count);
/* allow for dget above and top is already dgot */
if (p == top)
@@ -422,7 +379,7 @@
/* Not a forced expire? */
if (!(how & AUTOFS_EXP_FORCED)) {
/* ref-walk currently on this dentry? */
- ino_count = atomic_read(&ino->count) + 1;
+ ino_count = READ_ONCE(ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
}
@@ -439,7 +396,7 @@
/* Not a forced expire? */
if (!(how & AUTOFS_EXP_FORCED)) {
/* ref-walk currently on this dentry? */
- ino_count = atomic_read(&ino->count) + 1;
+ ino_count = READ_ONCE(ino->count) + 1;
if (d_count(dentry) > ino_count)
return NULL;
}
--
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