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>
diff --git a/fs/super.c b/fs/super.c
index ddba069..cb20744 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -38,6 +38,7 @@
#include <linux/kobject.h>
#include <linux/mutex.h>
#include <linux/file.h>
+#include <linux/async.h>
#include <asm/uaccess.h>
#include "internal.h"
@@ -71,6 +72,7 @@
INIT_HLIST_HEAD(&s->s_anon);
INIT_LIST_HEAD(&s->s_inodes);
INIT_LIST_HEAD(&s->s_dentry_lru);
+ INIT_LIST_HEAD(&s->s_async_list);
init_rwsem(&s->s_umount);
mutex_init(&s->s_lock);
lockdep_set_class(&s->s_umount, &type->s_umount_key);
@@ -289,11 +291,18 @@
{
const struct super_operations *sop = sb->s_op;
+
if (sb->s_root) {
shrink_dcache_for_umount(sb);
fsync_super(sb);
lock_super(sb);
sb->s_flags &= ~MS_ACTIVE;
+
+ /*
+ * wait for asynchronous fs operations to finish before going further
+ */
+ async_synchronize_full_special(&sb->s_async_list);
+
/* bad name - it should be evict_inodes() */
invalidate_inodes(sb);
lock_kernel();
@@ -449,6 +458,7 @@
if (sb->s_flags & MS_RDONLY)
continue;
sb->s_need_sync_fs = 1;
+ async_synchronize_full_special(&sb->s_async_list);
}
restart: