Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:40809 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751625Ab3IEQaY (ORCPT ); Thu, 5 Sep 2013 12:30:24 -0400 From: "J. Bruce Fields" To: Al Viro Cc: linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, jlayton@redhat.com, Dave Chinner , "J. Bruce Fields" Subject: [PATCH 00/12] Implement NFSv4 delegations, take 10 Date: Thu, 5 Sep 2013 12:30:04 -0400 Message-Id: <1378398620-23018-1-git-send-email-bfields@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: "J. Bruce Fields" Changes since version 9: - just a rebase to 3.11-rc6. Changes since version 8: - additional warnings in lock_two_nondirectories - lock_two_nondirectories handles NULL second argument, simplifying vfs_rename_other - kerneldoc comments on notify_change, vfs_link, vfs_rename, vfs_unlink, to explain delegated_inode argument. - make clear non-support of write delegations in generic_add_lease - rebase to 3.11-rc1 This patch series implements read delegations, which allow NFSv4 clients to perform read opens without contacting the server, by promising to call back to clients before modifying the data, metadata, or set of links pointing to a file. The main recent change was in response to review from Linus, who didn't want us to hang under directory i_mutex's on timeouts communicating with unresponsive clients. So, this version of the series drops the i_mutex before waiting. The logic ends up looking something like: acquire locks look up inode test for delegation; if found: take reference on inode release locks wait for delegation break drop reference on inode retry The initial test for a delegation happens after the lock on the delegated inode is acquired, but additional directory mutexes may have been acquired further up the call stack. I therefore add a "struct inode **" argument to any intervening functions, which we use to pass the inode back up to the caller in the case it needs to wait for the delegation to be broken. I also allow callers to pass in NULL for the "struct inode **" argument to indicate they'd rather just fail than wait for a delegation. For example, as long as ecryptfs isn't exportable I assume they'd rather not see retry logic there that they won't use. But I may have misjudged in some of these cases. J. Bruce Fields (12): vfs: pull ext4's double-i_mutex-locking into common code vfs: don't use PARENT/CHILD lock classes for non-directories vfs: rename I_MUTEX_QUOTA now that it's not used for quotas vfs: take i_mutex on renamed file locks: introduce new FL_DELEG lock flag locks: implement delegations namei: minor vfs_unlink cleanup locks: break delegations on unlink locks: helper functions for delegation breaking locks: break delegations on rename locks: break delegations on link locks: break delegations on any attribute modification Documentation/filesystems/directory-locking | 31 ++++-- drivers/base/devtmpfs.c | 6 +- fs/attr.c | 25 ++++- fs/cachefiles/interface.c | 4 +- fs/cachefiles/namei.c | 4 +- fs/ecryptfs/inode.c | 6 +- fs/ext4/ext4.h | 2 - fs/ext4/ioctl.c | 4 +- fs/ext4/move_extent.c | 40 +------- fs/hpfs/namei.c | 2 +- fs/inode.c | 42 ++++++++- fs/locks.c | 57 ++++++++--- fs/namei.c | 135 +++++++++++++++++++++++---- fs/nfsd/nfs4state.c | 2 +- fs/nfsd/vfs.c | 14 ++- fs/open.c | 22 ++++- fs/utimes.c | 9 +- include/linux/fs.h | 72 +++++++++++--- ipc/mqueue.c | 2 +- 19 files changed, 361 insertions(+), 118 deletions(-) -- 1.7.9.5