xfs_notify_failure requires a method to invalidate all mappings.
drop_pagecache_sb() can do this but it is a static function and only
build with CONFIG_SYSCTL. Now, move it to super.c and make it available
for others.
Signed-off-by: Shiyang Ruan <ruansy.f...@fujitsu.com>
---
fs/drop_caches.c | 33 ---------------------------------
fs/super.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/fs.h | 1 +
3 files changed, 35 insertions(+), 33 deletions(-)
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index e619c31b6bd9..5c8406076f9b 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -3,7 +3,6 @@
* Implement the manual drop-all-pagecache function
*/
-#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fs.h>
@@ -15,38 +14,6 @@
/* A global variable is a bit ugly, but it keeps the code simple */
int sysctl_drop_caches;
-static void drop_pagecache_sb(struct super_block *sb, void *unused)
-{
- struct inode *inode, *toput_inode = NULL;
-
- spin_lock(&sb->s_inode_list_lock);
- list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
- spin_lock(&inode->i_lock);
- /*
- * We must skip inodes in unusual state. We may also skip
- * inodes without pages but we deliberately won't in case
- * we need to reschedule to avoid softlockups.
- */
- if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
- (mapping_empty(inode->i_mapping) && !need_resched())) {
- spin_unlock(&inode->i_lock);
- continue;
- }
- __iget(inode);
- spin_unlock(&inode->i_lock);
- spin_unlock(&sb->s_inode_list_lock);
-
- invalidate_mapping_pages(inode->i_mapping, 0, -1);
- iput(toput_inode);
- toput_inode = inode;
-
- cond_resched();
- spin_lock(&sb->s_inode_list_lock);
- }
- spin_unlock(&sb->s_inode_list_lock);
- iput(toput_inode);
-}
-
int drop_caches_sysctl_handler(struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos)
{
diff --git a/fs/super.c b/fs/super.c
index 734ed584a946..bdf53dbe834c 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -36,6 +36,7 @@
#include <linux/lockdep.h>
#include <linux/user_namespace.h>
#include <linux/fs_context.h>
+#include <linux/pagemap.h>
#include <uapi/linux/mount.h>
#include "internal.h"
@@ -677,6 +678,39 @@ void drop_super_exclusive(struct super_block *sb)
}
EXPORT_SYMBOL(drop_super_exclusive);
+void drop_pagecache_sb(struct super_block *sb, void *unused)
+{
+ struct inode *inode, *toput_inode = NULL;
+
+ spin_lock(&sb->s_inode_list_lock);
+ list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+ spin_lock(&inode->i_lock);
+ /*
+ * We must skip inodes in unusual state. We may also skip
+ * inodes without pages but we deliberately won't in case
+ * we need to reschedule to avoid softlockups.
+ */
+ if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
+ (mapping_empty(inode->i_mapping) && !need_resched())) {
+ spin_unlock(&inode->i_lock);
+ continue;
+ }
+ __iget(inode);
+ spin_unlock(&inode->i_lock);
+ spin_unlock(&sb->s_inode_list_lock);
+
+ invalidate_mapping_pages(inode->i_mapping, 0, -1);
+ iput(toput_inode);
+ toput_inode = inode;
+
+ cond_resched();
+ spin_lock(&sb->s_inode_list_lock);
+ }
+ spin_unlock(&sb->s_inode_list_lock);
+ iput(toput_inode);
+}
+EXPORT_SYMBOL(drop_pagecache_sb);
+
static void __iterate_supers(void (*f)(struct super_block *))
{
struct super_block *sb, *p = NULL;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9eced4cc286e..5ded28c0d2c9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3292,6 +3292,7 @@ extern struct super_block *get_super(struct block_device
*);
extern struct super_block *get_active_super(struct block_device *bdev);
extern void drop_super(struct super_block *sb);
extern void drop_super_exclusive(struct super_block *sb);
+void drop_pagecache_sb(struct super_block *sb, void *unused);
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
extern void iterate_supers_type(struct file_system_type *,
void (*)(struct super_block *, void *), void *);
--
2.37.2
