From patchwork Tue Aug 18 18:07:01 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 31579 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.samba.org (fn.samba.org [216.83.154.106]) by bilbo.ozlabs.org (Postfix) with ESMTP id 18946B7067 for ; Wed, 19 Aug 2009 04:07:11 +1000 (EST) Received: from fn.samba.org (localhost [127.0.0.1]) by lists.samba.org (Postfix) with ESMTP id 6170D4657B; Tue, 18 Aug 2009 12:00:36 -0600 (MDT) X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on fn.samba.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=3.8 tests=AWL, BAYES_00, NO_MORE_FUNN, SPF_PASS autolearn=no version=3.2.5 X-Original-To: linux-cifs-client@lists.samba.org Delivered-To: linux-cifs-client@lists.samba.org Received: from cdptpa-omtalb.mail.rr.com (cdptpa-omtalb.mail.rr.com [75.180.132.122]) by lists.samba.org (Postfix) with ESMTP id 9EAE6ACF9E for ; Tue, 18 Aug 2009 12:00:30 -0600 (MDT) Received: from mail.poochiereds.net ([71.70.153.3]) by cdptpa-omta01.mail.rr.com with ESMTP id <20090818180703658.JPAK29812@cdptpa-omta01.mail.rr.com>; Tue, 18 Aug 2009 18:07:03 +0000 Received: by mail.poochiereds.net (Postfix, from userid 4447) id 174205814E; Tue, 18 Aug 2009 14:07:03 -0400 (EDT) From: Jeff Layton To: smfrench@gmail.com Date: Tue, 18 Aug 2009 14:07:01 -0400 Message-Id: <1250618822-6131-5-git-send-email-jlayton@redhat.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1250618822-6131-1-git-send-email-jlayton@redhat.com> References: <1250618822-6131-1-git-send-email-jlayton@redhat.com> Cc: linux-cifs-client@lists.samba.org Subject: [linux-cifs-client] [PATCH 4/5] cifs: take reference to inode for oplock breaks X-BeenThere: linux-cifs-client@lists.samba.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: The Linux CIFS VFS client List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-cifs-client-bounces@lists.samba.org Errors-To: linux-cifs-client-bounces@lists.samba.org When an oplock break comes in, cifs needs to do things like write out dirty data for it. It doesn't hold a reference to that inode in this case however. Get an active reference to the inode when an oplock break comes in. If we don't get a reference, we still need to create an oplock queue entry so that the oplock release call gets done, but we'll want to skip writeback in that case. Signed-off-by: Jeff Layton Acked-by: Shirish Pargaonkar --- fs/cifs/cifsfs.c | 26 ++++++++++---------------- fs/cifs/misc.c | 4 +++- 2 files changed, 13 insertions(+), 17 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 2fcc722..647c5bc 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -993,13 +993,8 @@ static int cifs_oplock_thread(void *dummyarg) cFYI(1, ("found oplock item to write out")); tcon = oplock->tcon; inode = oplock->pinode; - /* can not grab inode sem here since it would - deadlock when oplock received on delete - since vfs_unlink holds the i_mutex across - the call */ - /* mutex_lock(&inode->i_mutex);*/ - cifsi = CIFS_I(inode); - if (S_ISREG(inode->i_mode)) { + if (inode && S_ISREG(inode->i_mode)) { + cifsi = CIFS_I(inode); #ifdef CONFIG_CIFS_EXPERIMENTAL if (cifsi->clientCanCacheAll == 0) break_lease(inode, FMODE_READ); @@ -1010,17 +1005,16 @@ static int cifs_oplock_thread(void *dummyarg) if (cifsi->clientCanCacheRead == 0) { waitrc = filemap_fdatawait( inode->i_mapping); + if (rc == 0) + rc = waitrc; invalidate_remote_inode(inode); } - if (rc == 0) - rc = waitrc; - } else - rc = 0; - /* mutex_unlock(&inode->i_mutex);*/ - if (rc) - cifsi->write_behind_rc = rc; - cFYI(1, ("Oplock flush inode %p rc %d", - inode, rc)); + if (rc) + cifsi->write_behind_rc = rc; + cFYI(1, ("Oplock flush inode %p rc %d", + inode, rc)); + } + iput(inode); /* * releasing stale oplock after recent reconnect diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 7221af9..3bf3a52 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -502,6 +502,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv, struct cifsInodeInfo *pCifsInode; struct cifsFileInfo *netfile; struct oplock_q_entry *oplock; + struct inode *inode; cFYI(1, ("Checking for oplock break or dnotify response")); if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && @@ -600,6 +601,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv, pCifsInode->clientCanCacheAll = false; if (pSMB->OplockLevel == 0) pCifsInode->clientCanCacheRead = false; + inode = igrab(netfile->pInode); if (!oplock) { cERROR(1, ("Unable to allocate " @@ -608,7 +610,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv, } oplock->tcon = tcon; - oplock->pinode = netfile->pInode; + oplock->pinode = inode; oplock->netfid = netfile->netfid; spin_lock(&cifs_oplock_lock); list_add_tail(&oplock->qhead,