From patchwork Mon Dec 13 07:22:14 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shaohua Li X-Patchwork-Id: 405032 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oBD7MNKv028559 for ; Mon, 13 Dec 2010 07:22:24 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932302Ab0LMHWU (ORCPT ); Mon, 13 Dec 2010 02:22:20 -0500 Received: from mga02.intel.com ([134.134.136.20]:30789 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932206Ab0LMHWT (ORCPT ); Mon, 13 Dec 2010 02:22:19 -0500 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 12 Dec 2010 23:22:18 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,335,1288594800"; d="scan'208";a="583119518" Received: from sli10-conroe.sh.intel.com (HELO [10.239.36.47]) ([10.239.36.47]) by orsmga002.jf.intel.com with ESMTP; 12 Dec 2010 23:22:17 -0800 Subject: [RFC 3/5]add metadata_readahead ioctl in vfs From: Shaohua Li To: "linux-btrfs@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" Cc: Chris Mason , Christoph Hellwig , Arjan van de Ven , Andrew Morton Date: Mon, 13 Dec 2010 15:22:14 +0800 Message-ID: <1292224934.2323.452.camel@sli10-conroe> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Mon, 13 Dec 2010 07:22:24 +0000 (UTC) Index: linux/fs/ioctl.c =================================================================== --- linux.orig/fs/ioctl.c 2010-12-13 14:01:56.000000000 +0800 +++ linux/fs/ioctl.c 2010-12-13 14:10:42.000000000 +0800 @@ -605,6 +605,24 @@ static int ioctl_metadata_incore(struct return entries; } +static int ioctl_metadata_readahead(struct file *filp, void __user *argp) +{ + struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; + struct metadata_readahead_args args; + + if (!sb->s_op->metadata_readahead) + return -EOPNOTSUPP; + + if (copy_from_user(&args, (struct metadata_readahead_args __user *)argp, + sizeof(args))) + return -EFAULT; + + if ((args.offset & ~PAGE_CACHE_MASK) || (args.size & ~PAGE_CACHE_MASK)) + return -EINVAL; + + return sb->s_op->metadata_readahead(sb, args.offset, args.size); +} + /* * When you add any new common ioctls to the switches above and below * please update compat_sys_ioctl() too. @@ -668,6 +686,9 @@ int do_vfs_ioctl(struct file *filp, unsi case FIMETADATA_INCORE: return ioctl_metadata_incore(filp, argp); + case FIMETADATA_READAHEAD: + return ioctl_metadata_readahead(filp, argp); + default: if (S_ISREG(filp->f_path.dentry->d_inode->i_mode)) error = file_ioctl(filp, cmd, arg); Index: linux/include/linux/fs.h =================================================================== --- linux.orig/include/linux/fs.h 2010-12-13 14:01:56.000000000 +0800 +++ linux/include/linux/fs.h 2010-12-13 14:10:42.000000000 +0800 @@ -65,6 +65,11 @@ struct metadata_incore_args { __u32 unused; }; +struct metadata_readahead_args { + __u64 offset; + __u64 size; +}; + #define NR_FILE 8192 /* this can well be larger on a larger system */ #define MAY_EXEC 1 @@ -338,6 +343,7 @@ struct metadata_incore_args { #define FITHAW _IOWR('X', 120, int) /* Thaw */ #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ #define FIMETADATA_INCORE _IOWR('X', 122, struct metadata_incore_args) +#define FIMETADATA_READAHEAD _IOR('X', 123, struct metadata_readahead_args) #define FS_IOC_GETFLAGS _IOR('f', 1, long) #define FS_IOC_SETFLAGS _IOW('f', 2, long) @@ -1627,6 +1633,8 @@ struct super_operations { int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); int (*metadata_incore)(struct super_block*, loff_t *offset, ssize_t *size); + int (*metadata_readahead)(struct super_block*, loff_t offset, + ssize_t size); }; /* Index: linux/fs/compat_ioctl.c =================================================================== --- linux.orig/fs/compat_ioctl.c 2010-12-13 14:10:49.000000000 +0800 +++ linux/fs/compat_ioctl.c 2010-12-13 14:11:35.000000000 +0800 @@ -883,6 +883,7 @@ COMPATIBLE_IOCTL(FIGETBSZ) COMPATIBLE_IOCTL(FIFREEZE) COMPATIBLE_IOCTL(FITHAW) COMPATIBLE_IOCTL(FIMETADATA_INCORE) +COMPATIBLE_IOCTL(FIMETADATA_READAHEAD) COMPATIBLE_IOCTL(KDGETKEYCODE) COMPATIBLE_IOCTL(KDSETKEYCODE) COMPATIBLE_IOCTL(KDGKBTYPE)