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async: make the final inode deletion an asynchronous event

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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>
This commit is contained in:
Arjan van de Ven 2009-01-06 07:20:54 -08:00
parent f29d3b2323
commit efaee19206
3 changed files with 28 additions and 7 deletions
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20
fs/inode.c
View file

@ -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)

10
fs/super.c
View file

@ -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 @@ static struct super_block *alloc_super(struct file_system_type *type)
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 @@ void generic_shutdown_super(struct super_block *sb)
{
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 @@ void sync_filesystems(int wait)
if (sb->s_flags & MS_RDONLY)
continue;
sb->s_need_sync_fs = 1;
async_synchronize_full_special(&sb->s_async_list);
}
restart:

5
include/linux/fs.h
View file

@ -1184,6 +1184,11 @@ struct super_block {
* generic_show_options()
*/
char *s_options;
/*
* storage for asynchronous operations
*/
struct list_head s_async_list;
};
extern struct timespec current_fs_time(struct super_block *sb);