From patchwork Mon Jun 1 21:50:30 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Eric W. Biederman" X-Patchwork-Id: 27280 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n51LpH2c026573 for ; Mon, 1 Jun 2009 21:51:17 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753043AbZFAVvN (ORCPT ); Mon, 1 Jun 2009 17:51:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755967AbZFAVvN (ORCPT ); Mon, 1 Jun 2009 17:51:13 -0400 Received: from out02.mta.xmission.com ([166.70.13.232]:35855 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753043AbZFAVu6 (ORCPT ); Mon, 1 Jun 2009 17:50:58 -0400 Received: from in01.mta.xmission.com ([166.70.13.51]) by out02.mta.xmission.com with esmtp (Exim 4.62) (envelope-from ) id 1MBFPI-0001fz-2J; Mon, 01 Jun 2009 15:51:00 -0600 Received: from [76.21.114.89] (helo=fess.ebiederm.org) by in01.mta.xmission.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69) (envelope-from ) id 1MBFPH-0002BZ-Eu; Mon, 01 Jun 2009 15:51:00 -0600 Received: from fess.ebiederm.org (localhost [127.0.0.1]) by fess.ebiederm.org (8.14.3/8.14.3/Debian-4) with ESMTP id n51Loud9017081; Mon, 1 Jun 2009 14:50:56 -0700 Received: (from eric@localhost) by fess.ebiederm.org (8.14.3/8.14.3/Submit) id n51LouGA017080; Mon, 1 Jun 2009 14:50:56 -0700 From: "Eric W. Biederman" To: Al Viro Cc: , , , , Hugh Dickins , Tejun Heo , Alexey Dobriyan , Linus Torvalds , Alan Cox , Greg Kroah-Hartman , Nick Piggin , Andrew Morton , Christoph Hellwig , "Eric W. Biederman" , "Eric W. Biederman" Date: Mon, 1 Jun 2009 14:50:30 -0700 Message-Id: <1243893048-17031-5-git-send-email-ebiederm@xmission.com> X-Mailer: git-send-email 1.6.3.1.54.g99dd.dirty In-Reply-To: References: X-XM-SPF: eid=; ; ; mid=; ; ; hst=in01.mta.xmission.com; ; ; ip=76.21.114.89; ; ; frm=ebiederm@xmission.com; ; ; spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Rcpt-To: viro@ZenIV.linux.org.uk, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, hugh@veritas.com, tj@kernel.org, adobriyan@gmail.com, torvalds@linux-foundation.org, alan@lxorguk.ukuu.org.uk, gregkh@suse.de, npiggin@suse.de, akpm@linux-foundation.org, hch@infradead.org, ebiederm@maxwell.arastra.com, ebiederm@aristanetworks.com X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa01 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on sa01.xmission.com X-Spam-Level: X-Spam-Status: No, score=-2.5 required=8.0 tests=ALL_TRUSTED,BAYES_00, DCC_CHECK_NEGATIVE, T_TM2_M_HEADER_IN_MSG, T_TooManySym_01, UNTRUSTED_Relay, XMNoVowels,XM_SPF_Neutral autolearn=disabled version=3.2.5 X-Spam-Combo: ;Al Viro X-Spam-Relay-Country: X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 1.5 XMNoVowels Alpha-numberic number with no vowels * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa01 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject * 0.0 XM_SPF_Neutral SPF-Neutral * 0.4 UNTRUSTED_Relay Comes from a non-trusted relay Subject: [PATCH 05/23] vfs: Teach lseek to use file_hotplug_lock X-SA-Exim-Version: 4.2.1 (built Thu, 25 Oct 2007 00:26:12 +0000) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Eric W. Biederman Signed-off-by: Eric W. Biederman --- fs/read_write.c | 24 +++++++++++++++++------- 1 files changed, 17 insertions(+), 7 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 9d1e76b..c9511ce 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -136,14 +136,24 @@ EXPORT_SYMBOL(default_llseek); loff_t vfs_llseek(struct file *file, loff_t offset, int origin) { loff_t (*fn)(struct file *, loff_t, int); + loff_t retval = -ESPIPE; - fn = no_llseek; - if (file->f_mode & FMODE_LSEEK) { - fn = default_llseek; - if (file->f_op && file->f_op->llseek) - fn = file->f_op->llseek; - } - return fn(file, offset, origin); + if (!(file->f_mode & FMODE_LSEEK)) + goto out; + + retval = -EIO; + if (!file_hotplug_read_trylock(file)) + goto out; + + fn = default_llseek; + if (file->f_op && file->f_op->llseek) + fn = file->f_op->llseek; + + retval = fn(file, offset, origin); + + file_hotplug_read_unlock(file); +out: + return retval; } EXPORT_SYMBOL(vfs_llseek);