fbcon: add lifetime refcount to opened frame buffers

[pandora-kernel.git] / fs / drop_caches.c

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 2195c21..98b77c8 100644 (file)
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -8,6 +8,7 @@
 #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;
@@ -16,20 +17,23 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
 {
        struct inode *inode, *toput_inode = NULL;
 
-       spin_lock(&inode_lock);
+       spin_lock(&inode_sb_list_lock);
        list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
-               if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
-                       continue;
-               if (inode->i_mapping->nrpages == 0)
+               spin_lock(&inode->i_lock);
+               if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
+                   (inode->i_mapping->nrpages == 0)) {
+                       spin_unlock(&inode->i_lock);
                        continue;
+               }
                __iget(inode);
-               spin_unlock(&inode_lock);
+               spin_unlock(&inode->i_lock);
+               spin_unlock(&inode_sb_list_lock);
                invalidate_mapping_pages(inode->i_mapping, 0, -1);
                iput(toput_inode);
                toput_inode = inode;
-               spin_lock(&inode_lock);
+               spin_lock(&inode_sb_list_lock);
        }
-       spin_unlock(&inode_lock);
+       spin_unlock(&inode_sb_list_lock);
        iput(toput_inode);
 }
 
@@ -45,7 +49,11 @@ static void drop_slab(void)
 int drop_caches_sysctl_handler(ctl_table *table, int write,
        void __user *buffer, size_t *length, loff_t *ppos)
 {
-       proc_dointvec_minmax(table, write, buffer, length, ppos);
+       int ret;
+
+       ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
+       if (ret)
+               return ret;
        if (write) {
                if (sysctl_drop_caches & 1)
                        iterate_supers(drop_pagecache_sb, NULL);