From patchwork Mon Jul 13 05:50:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peng Tao X-Patchwork-Id: 6774191 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 747489F2E8 for ; Mon, 13 Jul 2015 05:51:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 81BA9204EC for ; Mon, 13 Jul 2015 05:51:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7FCAD205EB for ; Mon, 13 Jul 2015 05:51:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751115AbbGMFvh (ORCPT ); Mon, 13 Jul 2015 01:51:37 -0400 Received: from mail-pa0-f41.google.com ([209.85.220.41]:35793 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751038AbbGMFvh (ORCPT ); Mon, 13 Jul 2015 01:51:37 -0400 Received: by pactm7 with SMTP id tm7so201356988pac.2 for ; Sun, 12 Jul 2015 22:51:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=JqjsgXuK+kPdymyD3dW5AQZbLy5mpoyfZ+mqTTF1XK8=; b=F44VMYjKSgeaEQpIr0z9gLsPdvC2HX464XbtuQTOKu0IOPhKvBWP/tVEq64SskFVtt kpQ8tyBI4y63b8QRyzVOidjHGGyHcud1b0yk/vQQUuoKobkB3WCvbXbqFLq7yB77iDVd L0LWP8W7qz6dKxzmSw9Q+Utb3x61zQ/C/DkGdQV8Q8riCQPCLo6MnFsOf+OlfxaZnuaz 9h2vJC4Z77SUQxLMhWLuk2aBR5WWqLDCk5RJ0FfTt4+xxt1m7yvL7BhcW5kGccjkULz/ DmCQotATWPKiCW6wIi31i1mt6mb880ZX6Imp90QhRLaVkZSIRZLcFgoiVGBM8WRlCkla JJ4w== X-Gm-Message-State: ALoCoQkmHXhddB6XqDqEnOFdqxmuwZzeqhlBTEaP2P0c3ffxXEpifRebBC8QF4Z1q/zbGXe0/+OZ X-Received: by 10.68.197.161 with SMTP id iv1mr66642759pbc.0.1436766696507; Sun, 12 Jul 2015 22:51:36 -0700 (PDT) Received: from lear.localdomain (ec2-54-65-164-9.ap-northeast-1.compute.amazonaws.com. [54.65.164.9]) by smtp.gmail.com with ESMTPSA id ho10sm17001275pbc.27.2015.07.12.22.51.34 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 12 Jul 2015 22:51:35 -0700 (PDT) From: Peng Tao To: linux-nfs@vger.kernel.org Cc: Trond Myklebust , Anna Schumaker , Peng Tao Subject: [PATCH 5/7] nfs42: add NFS_IOC_CLONE ioctl Date: Mon, 13 Jul 2015 13:50:53 +0800 Message-Id: <1436766655-10696-6-git-send-email-tao.peng@primarydata.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1436766655-10696-1-git-send-email-tao.peng@primarydata.com> References: <1436766655-10696-1-git-send-email-tao.peng@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP It can be called by user space to CLONE two files. Signed-off-by: Peng Tao --- fs/nfs/nfs4file.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/nfs.h | 4 ++ 2 files changed, 106 insertions(+) diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index dcd39d4..dfa6620 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -4,6 +4,7 @@ * Copyright (C) 1992 Rick Sladkey */ #include +#include #include #include #include "internal.h" @@ -166,8 +167,104 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t return nfs42_proc_deallocate(filep, offset, len); return nfs42_proc_allocate(filep, offset, len); } + +static noinline long +nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd, + u64 src_off, u64 dst_off, u64 count) +{ + struct inode *dst_inode = file_inode(dst_file); + struct fd src_file; + struct inode *src_inode; + int ret; + + /* dst file must be opened for writing */ + if (!(dst_file->f_mode & FMODE_WRITE)) + return -EINVAL; + + ret = mnt_want_write_file(dst_file); + if (ret) + return ret; + + src_file = fdget(srcfd); + if (!src_file.file) { + ret = -EBADF; + goto out_drop_write; + } + + src_inode = file_inode(src_file.file); + + /* src and dst must be different files */ + ret = -EINVAL; + if (src_inode == dst_inode) + goto out_fput; + + /* src file must be opened for reading */ + if (!(src_file.file->f_mode & FMODE_READ)) + goto out_fput; + + /* src and dst must be regular files */ + ret = -EISDIR; + if (!S_ISREG(src_inode->i_mode) || !S_ISREG(dst_inode->i_mode)) + goto out_fput; + + ret = -EXDEV; + if (src_file.file->f_path.mnt != dst_file->f_path.mnt || + src_inode->i_sb != dst_inode->i_sb) + goto out_fput; + + /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ + if (dst_inode < src_inode) { + mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD); + } else { + mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_CHILD); + } + + /* flush all pending writes on both src and dst so that server + * has the latest data */ + ret = nfs_sync_inode(src_inode); + if (ret) + goto out_unlock; + ret = nfs_sync_inode(dst_inode); + if (ret) + goto out_unlock; + + ret = nfs42_proc_clone(src_file.file, dst_file, src_off, dst_off, count); + + /* truncate inode page cache of the dst range so that future reads can fetch + * new data from server */ + if (!ret) + truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); + +out_unlock: + if (dst_inode < src_inode) { + mutex_unlock(&src_inode->i_mutex); + mutex_unlock(&dst_inode->i_mutex); + } else { + mutex_unlock(&dst_inode->i_mutex); + mutex_unlock(&src_inode->i_mutex); + } +out_fput: + fdput(src_file); +out_drop_write: + mnt_drop_write_file(dst_file); + return ret; +} #endif /* CONFIG_NFS_V4_2 */ +long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { +#ifdef CONFIG_NFS_V4_2 + case NFS_IOC_CLONE: + return nfs42_ioctl_clone(file, arg, 0, 0, 0); +#endif + } + + return -ENOTTY; +} + const struct file_operations nfs4_file_operations = { #ifdef CONFIG_NFS_V4_2 .llseek = nfs4_file_llseek, @@ -190,4 +287,9 @@ const struct file_operations nfs4_file_operations = { #endif /* CONFIG_NFS_V4_2 */ .check_flags = nfs_check_flags, .setlease = simple_nosetlease, +#ifdef CONFIG_COMPAT + .unlocked_ioctl = nfs4_ioctl, +#else + .compat_ioctl = nfs4_ioctl, +#endif /* CONFIG_COMPAT */ }; diff --git a/include/uapi/linux/nfs.h b/include/uapi/linux/nfs.h index 5199a36..fd48708 100644 --- a/include/uapi/linux/nfs.h +++ b/include/uapi/linux/nfs.h @@ -31,6 +31,10 @@ #define NFS_PIPE_DIRNAME "nfs" +/* NFS ioctl */ +#define NFS_IOCTL_MAGIC 'n' +#define NFS_IOC_CLONE _IOW(NFS_IOCTL_MAGIC, 1, int) + /* * NFS stats. The good thing with these values is that NFSv3 errors are * a superset of NFSv2 errors (with the exception of NFSERR_WFLUSH which