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authorAl Viro <viro@zeniv.linux.org.uk>2010-03-23 06:06:58 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2010-05-21 18:31:16 -0400
commit01a05b337a5b647909e1d6670f57e7202318a5fb (patch)
tree7877f08db14877d06346c8e1ef52aa17f2483e93 /fs/drop_caches.c
parent35cf7ba0b46dc3582a01c3860b14bff122662aa3 (diff)
downloadlinux-01a05b337a5b647909e1d6670f57e7202318a5fb.tar.gz
new helper: iterate_supers()
... and switch the simple "loop over superblocks and do something" loops to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/drop_caches.c')
-rw-r--r--fs/drop_caches.c25
1 files changed, 2 insertions, 23 deletions
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 52047cf4177..83c4f600786 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -8,12 +8,11 @@
#include <linux/writeback.h>
#include <linux/sysctl.h>
#include <linux/gfp.h>
-#include "internal.h"
/* 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)
+static void drop_pagecache_sb(struct super_block *sb, void *unused)
{
struct inode *inode, *toput_inode = NULL;
@@ -34,26 +33,6 @@ static void drop_pagecache_sb(struct super_block *sb)
iput(toput_inode);
}
-static void drop_pagecache(void)
-{
- struct super_block *sb, *n;
-
- spin_lock(&sb_lock);
- list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
- if (list_empty(&sb->s_instances))
- continue;
- sb->s_count++;
- spin_unlock(&sb_lock);
- down_read(&sb->s_umount);
- if (sb->s_root)
- drop_pagecache_sb(sb);
- up_read(&sb->s_umount);
- spin_lock(&sb_lock);
- __put_super(sb);
- }
- spin_unlock(&sb_lock);
-}
-
static void drop_slab(void)
{
int nr_objects;
@@ -69,7 +48,7 @@ int drop_caches_sysctl_handler(ctl_table *table, int write,
proc_dointvec_minmax(table, write, buffer, length, ppos);
if (write) {
if (sysctl_drop_caches & 1)
- drop_pagecache();
+ iterate_supers(drop_pagecache_sb, NULL);
if (sysctl_drop_caches & 2)
drop_slab();
}