Return-Path: Received: from mail-pa0-f52.google.com ([209.85.220.52]:36017 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756531AbbHZITF (ORCPT ); Wed, 26 Aug 2015 04:19:05 -0400 Received: by pacgr6 with SMTP id gr6so1408764pac.3 for ; Wed, 26 Aug 2015 01:19:04 -0700 (PDT) From: Peng Tao To: linux-fsdevel@vger.kernel.org Cc: Trond Myklebust , Anna Schumaker , Christoph Hellwig , Zach Brown , Darren Hart , bfields@fieldses.org, Jeff Layton , linux-nfs@vger.kernel.org, "Darrick J. Wong" , linux-btrfs@vger.kernel.org, Peng Tao Subject: [PATCH-RFC-RESEND 5/9] nfs42: add .copy_range file operation Date: Wed, 26 Aug 2015 16:16:46 +0800 Message-Id: <1440577010-122867-6-git-send-email-tao.peng@primarydata.com> In-Reply-To: <1440577010-122867-1-git-send-email-tao.peng@primarydata.com> References: <1440577010-122867-1-git-send-email-tao.peng@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Signed-off-by: Peng Tao --- fs/nfs/nfs4file.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index dcd39d4..c335cb0 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" @@ -166,6 +167,54 @@ 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 int +nfs42_file_clone_range(struct file *src_file, struct file *dst_file, + loff_t src_off, size_t dst_off, loff_t count) +{ + struct inode *dst_inode = file_inode(dst_file); + struct inode *src_inode = file_inode(src_file); + int ret; + + /* src and dst must be different files */ + if (src_inode == dst_inode) + return -EINVAL; + + /* 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, 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); + } + return ret; +} #endif /* CONFIG_NFS_V4_2 */ const struct file_operations nfs4_file_operations = { @@ -187,6 +236,7 @@ const struct file_operations nfs4_file_operations = { .splice_write = iter_file_splice_write, #ifdef CONFIG_NFS_V4_2 .fallocate = nfs42_fallocate, + .clone_range = nfs42_file_clone_range, #endif /* CONFIG_NFS_V4_2 */ .check_flags = nfs_check_flags, .setlease = simple_nosetlease, -- 1.8.3.1