From patchwork Wed Jul 3 20:12:33 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bruce Fields X-Patchwork-Id: 2820111 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 [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 240369F3C3 for ; Wed, 3 Jul 2013 20:12:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 29B4E2023B for ; Wed, 3 Jul 2013 20:12:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44AC82023A for ; Wed, 3 Jul 2013 20:12:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933230Ab3GCUMt (ORCPT ); Wed, 3 Jul 2013 16:12:49 -0400 Received: from fieldses.org ([174.143.236.118]:39219 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932690Ab3GCUMp (ORCPT ); Wed, 3 Jul 2013 16:12:45 -0400 Received: from bfields by fieldses.org with local (Exim 4.76) (envelope-from ) id 1UuTPx-0003hm-Ec; Wed, 03 Jul 2013 16:12:45 -0400 From: "J. Bruce Fields" To: Al Viro Cc: linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, "J. Bruce Fields" Subject: [PATCH 09/12] locks: helper functions for delegation breaking Date: Wed, 3 Jul 2013 16:12:33 -0400 Message-Id: <1372882356-14168-10-git-send-email-bfields@redhat.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1372882356-14168-1-git-send-email-bfields@redhat.com> References: <1372882356-14168-1-git-send-email-bfields@redhat.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=-6.9 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 From: "J. Bruce Fields" We'll need the same logic for rename and link. Signed-off-by: J. Bruce Fields Acked-by: Jeff Layton --- fs/namei.c | 13 +++---------- include/linux/fs.h | 33 +++++++++++++++++++++++++++++++-- 2 files changed, 34 insertions(+), 12 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index cba3db1..a9d4031 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3401,14 +3401,9 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry, struct inode **delegate else { error = security_inode_unlink(dir, dentry); if (!error) { - error = break_deleg(target, O_WRONLY|O_NONBLOCK); - if (error) { - if (error == -EWOULDBLOCK && delegated_inode) { - *delegated_inode = target; - ihold(target); - } + error = try_break_deleg(target, delegated_inode); + if (error) goto out; - } error = dir->i_op->unlink(dir, dentry); if (!error) dont_mount(dentry); @@ -3478,9 +3473,7 @@ exit2: iput(inode); /* truncate the inode here */ inode = NULL; if (delegated_inode) { - error = break_deleg(delegated_inode, O_WRONLY); - iput(delegated_inode); - delegated_inode = NULL; + error = break_deleg_wait(&delegated_inode); if (!error) goto retry_deleg; } diff --git a/include/linux/fs.h b/include/linux/fs.h index f951588..c37e463 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1894,6 +1894,9 @@ extern bool our_mnt(struct vfsmount *mnt); extern int current_umask(void); +extern void ihold(struct inode * inode); +extern void iput(struct inode *); + /* /sys/fs */ extern struct kobject *fs_kobj; @@ -1962,6 +1965,28 @@ static inline int break_deleg(struct inode *inode, unsigned int mode) return 0; } +static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) +{ + int ret; + + ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); + if (ret == -EWOULDBLOCK && delegated_inode) { + *delegated_inode = inode; + ihold(inode); + } + return ret; +} + +static inline int break_deleg_wait(struct inode **delegated_inode) +{ + int ret; + + ret = break_deleg(*delegated_inode, O_WRONLY); + iput(*delegated_inode); + *delegated_inode = NULL; + return ret; +} + #else /* !CONFIG_FILE_LOCKING */ static inline int locks_mandatory_locked(struct inode *inode) { @@ -2005,6 +2030,12 @@ static inline int break_deleg(struct inode *inode, unsigned int mode) { return 0; } + +static inline int try_break_deleg(struct inode *inode, struct delegated_inode **inode) +{ + return 0; +} + #endif /* CONFIG_FILE_LOCKING */ /* fs/open.c */ @@ -2335,8 +2366,6 @@ extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); extern int inode_init_always(struct super_block *, struct inode *); extern void inode_init_once(struct inode *); extern void address_space_init_once(struct address_space *mapping); -extern void ihold(struct inode * inode); -extern void iput(struct inode *); extern struct inode * igrab(struct inode *); extern ino_t iunique(struct super_block *, ino_t); extern int inode_needs_sync(struct inode *inode);