From patchwork Fri Aug 7 20:38:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Schumaker, Anna" X-Patchwork-Id: 6972981 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 02BA3C05AC for ; Fri, 7 Aug 2015 20:38:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0D31820437 for ; Fri, 7 Aug 2015 20:38:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 623FB20588 for ; Fri, 7 Aug 2015 20:38:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946167AbbHGUid (ORCPT ); Fri, 7 Aug 2015 16:38:33 -0400 Received: from mx144.netapp.com ([216.240.21.25]:20839 "EHLO mx144.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754030AbbHGUic (ORCPT ); Fri, 7 Aug 2015 16:38:32 -0400 X-IronPort-AV: E=Sophos;i="5.15,630,1432623600"; d="scan'208";a="61009655" Received: from vmwexchts04-prd.hq.netapp.com ([10.122.105.32]) by mx144-out.netapp.com with ESMTP; 07 Aug 2015 13:38:31 -0700 Received: from smtp2.corp.netapp.com (10.57.159.114) by VMWEXCHTS04-PRD.hq.netapp.com (10.122.105.32) with Microsoft SMTP Server id 15.0.1076.9; Fri, 7 Aug 2015 13:38:30 -0700 Received: from davros.com ([10.63.230.123]) by smtp2.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id t77KcP1N011473; Fri, 7 Aug 2015 13:38:29 -0700 (PDT) From: Anna Schumaker To: , , CC: Subject: [PATCH 3/7] btrfs: add .copy_file_range file operation Date: Fri, 7 Aug 2015 16:38:19 -0400 Message-ID: <1438979904-8775-4-git-send-email-Anna.Schumaker@Netapp.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1438979904-8775-1-git-send-email-Anna.Schumaker@Netapp.com> References: <1438979904-8775-1-git-send-email-Anna.Schumaker@Netapp.com> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 From: Zach Brown This rearranges the existing COPY_RANGE ioctl implementation so that the .copy_file_range file operation can call the core loop that copies file data extent items. The extent copying loop is lifted up into its own function. It retains the core btrfs error checks that should be shared. Signed-off-by: Zach Brown --- fs/btrfs/ctree.h | 3 ++ fs/btrfs/file.c | 1 + fs/btrfs/ioctl.c | 91 ++++++++++++++++++++++++++++++++------------------------ 3 files changed, 56 insertions(+), 39 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index aac314e..e09d4e2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -4000,6 +4000,9 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, loff_t pos, size_t write_bytes, struct extent_state **cached); int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end); +ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t len, int flags); /* tree-defrag.c */ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index b823fac..b05449c 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2816,6 +2816,7 @@ const struct file_operations btrfs_file_operations = { #ifdef CONFIG_COMPAT .compat_ioctl = btrfs_ioctl, #endif + .copy_file_range = btrfs_copy_file_range, }; void btrfs_auto_defrag_exit(void) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 0770c91..62ae286 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3719,17 +3719,16 @@ out: return ret; } -static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, - u64 off, u64 olen, u64 destoff) +static noinline int btrfs_clone_files(struct file *file, struct file *file_src, + u64 off, u64 olen, u64 destoff) { struct inode *inode = file_inode(file); + struct inode *src = file_inode(file_src); struct btrfs_root *root = BTRFS_I(inode)->root; - struct fd src_file; - struct inode *src; int ret; u64 len = olen; u64 bs = root->fs_info->sb->s_blocksize; - int same_inode = 0; + int same_inode = src == inode; /* * TODO: @@ -3742,49 +3741,20 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, * be either compressed or non-compressed. */ - /* the destination must be opened for writing */ - if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) - return -EINVAL; - if (btrfs_root_readonly(root)) return -EROFS; - ret = mnt_want_write_file(file); - if (ret) - return ret; - - src_file = fdget(srcfd); - if (!src_file.file) { - ret = -EBADF; - goto out_drop_write; - } - - ret = -EXDEV; - if (src_file.file->f_path.mnt != file->f_path.mnt) - goto out_fput; - - src = file_inode(src_file.file); - - ret = -EINVAL; - if (src == inode) - same_inode = 1; - - /* the src must be open for reading */ - if (!(src_file.file->f_mode & FMODE_READ)) - goto out_fput; + if (file_src->f_path.mnt != file->f_path.mnt || + src->i_sb != inode->i_sb) + return -EXDEV; /* don't make the dst file partly checksummed */ if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) - goto out_fput; + return -EINVAL; - ret = -EISDIR; if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) - goto out_fput; - - ret = -EXDEV; - if (src->i_sb != inode->i_sb) - goto out_fput; + return -EISDIR; if (!same_inode) { if (inode < src) { @@ -3877,6 +3847,49 @@ out_unlock: } else { mutex_unlock(&src->i_mutex); } + return ret; +} + +ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t len, int flags) +{ + ssize_t ret; + + ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out); + if (ret == 0) + ret = len; + return ret; +} + +static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, + u64 off, u64 olen, u64 destoff) +{ + struct fd src_file; + int ret; + + /* the destination must be opened for writing */ + if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) + return -EINVAL; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + src_file = fdget(srcfd); + if (!src_file.file) { + ret = -EBADF; + goto out_drop_write; + } + + /* the src must be open for reading */ + if (!(src_file.file->f_mode & FMODE_READ)) { + ret = -EINVAL; + goto out_fput; + } + + ret = btrfs_clone_files(file, src_file.file, off, olen, destoff); + out_fput: fdput(src_file); out_drop_write: