async: make the final inode deletion an asynchronous event

this makes "rm -rf" on a (names cached) kernel tree go from
11.6 to 8.6 seconds on an ext3 filesystem

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/fs/inode.c b/fs/inode.c
index 7a6e8c2ff7b1..0013ac1af8e7 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -22,6 +22,7 @@
 #include <linux/bootmem.h>
 #include <linux/inotify.h>
 #include <linux/mount.h>
+#include <linux/async.h>
 
 /*
  * This is needed for the following functions:
@@ -1138,16 +1139,11 @@ EXPORT_SYMBOL(remove_inode_hash);
  * I_FREEING is set so that no-one will take a new reference to the inode while
  * it is being deleted.
  */
-void generic_delete_inode(struct inode *inode)
+static void generic_delete_inode_async(void *data, async_cookie_t cookie)
 {
+        struct inode *inode = data;
         const struct super_operations *op = inode->i_sb->s_op;
 
-        list_del_init(&inode->i_list);
-        list_del_init(&inode->i_sb_list);
-        inode->i_state |= I_FREEING;
-        inodes_stat.nr_inodes--;
-        spin_unlock(&inode_lock);
-
         security_inode_delete(inode);
 
         if (op->delete_inode) {
@@ -1171,6 +1167,16 @@ void generic_delete_inode(struct inode *inode)
         destroy_inode(inode);
 }
 
+void generic_delete_inode(struct inode *inode)
+{
+        list_del_init(&inode->i_list);
+        list_del_init(&inode->i_sb_list);
+        inode->i_state |= I_FREEING;
+        inodes_stat.nr_inodes--;
+        spin_unlock(&inode_lock);
+        async_schedule_special(generic_delete_inode_async, inode, &inode->i_sb->s_async_list);
+}
+
 EXPORT_SYMBOL(generic_delete_inode);
 
 static void generic_forget_inode(struct inode *inode)