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Commit efaee192 authored by Arjan van de Ven's avatar Arjan van de Ven
Browse files

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: default avatarArjan van de Ven <arjan@linux.intel.com>
parent f29d3b23

fs/inode.c

+13 −7
Original line number Diff line number Diff line
@@ -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)

fs/super.c

+10 −0
Original line number Diff line number Diff line
@@ -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:

include/linux/fs.h

+5 −0
Original line number Diff line number Diff line
@@ -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);