From: Arjan van de Ven Subject: [PATCH] ext3: sreadahead hooks Date: Tue, 14 Oct 2008 10:17:35 -0400 Message-ID: <20081014101735.04107779@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Cc: tytso@mit.edu To: linux-ext4@vger.kernel.org Return-path: Received: from casper.infradead.org ([85.118.1.10]:47210 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750892AbYJNORg convert rfc822-to-8bit (ORCPT ); Tue, 14 Oct 2008 10:17:36 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: >From 3d7a0ca0ee8a755251251bd9ddca0866c25acdc2 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Tue, 14 Oct 2008 10:12:08 -0400 Subject: [PATCH] ext3: sreadahead hooks The sreadahead program, used to make the OS boot faster, needs to know in the approximate order in files are used during the boot process. This patch adds the ext3 hook for this functionality, basically it stores "jiffies" into the inode at allocation time, and exposes it via an EXT3 ioctl (yes I know but ioctl seems fitting for this). Signed-off-by: Arjan van de Ven --- fs/ext3/ioctl.c | 3 +++ fs/ext3/super.c | 1 + include/linux/ext3_fs.h | 1 + include/linux/ext3_fs_i.h | 2 ++ 4 files changed, 7 insertions(+), 0 deletions(-) diff --git a/fs/ext3/ioctl.c b/fs/ext3/ioctl.c index 0d0c701..b196f71 100644 --- a/fs/ext3/ioctl.c +++ b/fs/ext3/ioctl.c @@ -286,6 +286,9 @@ group_add_out: mnt_drop_write(filp->f_path.mnt); return err; } + case EXT3_IOC_INODE_JIFFIES: { + return ei->created_when; + } default: diff --git a/fs/ext3/super.c b/fs/ext3/super.c index f38a5af..c2c83dd 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -456,6 +456,7 @@ static struct inode *ext3_alloc_inode(struct super_block *sb) #endif ei->i_block_alloc_info = NULL; ei->vfs_inode.i_version = 1; + ei->created_when = jiffies; return &ei->vfs_inode; } diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h index 8120fa1..d1ba6b8 100644 --- a/include/linux/ext3_fs.h +++ b/include/linux/ext3_fs.h @@ -225,6 +225,7 @@ struct ext3_new_group_data { #endif #define EXT3_IOC_GETRSVSZ _IOR('f', 5, long) #define EXT3_IOC_SETRSVSZ _IOW('f', 6, long) +#define EXT3_IOC_INODE_JIFFIES _IOR('f', 19, long) /* * ioctl commands in 32 bit emulation diff --git a/include/linux/ext3_fs_i.h b/include/linux/ext3_fs_i.h index 7894dd0..87d512a 100644 --- a/include/linux/ext3_fs_i.h +++ b/include/linux/ext3_fs_i.h @@ -141,6 +141,8 @@ struct ext3_inode_info { * by other means, so we have truncate_mutex. */ struct mutex truncate_mutex; + unsigned long created_when; /* jiffies of creation time */ + struct inode vfs_inode; }; -- 1.5.5.1 -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org