From patchwork Wed Sep 11 16:45:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11141579 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B7A3E184E for ; Wed, 11 Sep 2019 16:45:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9714720863 for ; Wed, 11 Sep 2019 16:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729268AbfIKQpa (ORCPT ); Wed, 11 Sep 2019 12:45:30 -0400 Received: from mx2.suse.de ([195.135.220.15]:34434 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728896AbfIKQpa (ORCPT ); Wed, 11 Sep 2019 12:45:30 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 146A0AF85; Wed, 11 Sep 2019 16:45:28 +0000 (UTC) From: Goldwyn Rodrigues To: linux-fsdevel@vger.kernel.org Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, hch@infradead.org, andres@anarazel.de, david@fromorbit.com, riteshh@linux.ibm.com, linux-f2fs-devel@lists.sourceforge.net, Goldwyn Rodrigues Subject: [PATCH 2/3] ext4: fix inode rwsem regression Date: Wed, 11 Sep 2019 11:45:16 -0500 Message-Id: <20190911164517.16130-3-rgoldwyn@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190911164517.16130-1-rgoldwyn@suse.de> References: <20190911093926.pfkkx25mffzeuo32@alap3.anarazel.de> <20190911164517.16130-1-rgoldwyn@suse.de> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Goldwyn Rodrigues This is similar to 942491c9e6d6 ("xfs: fix AIM7 regression") Apparently our current rwsem code doesn't like doing the trylock, then lock for real scheme. So change our read/write methods to just do the trylock for the RWF_NOWAIT case. Fixes: 728fbc0e10b7 ("ext4: nowait aio support") Signed-off-by: Goldwyn Rodrigues Reviewed-by: Ritesh Harjani Reviewed-by: Jan Kara --- fs/ext4/file.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 70b0438dbc94..d5b2d0cc325d 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -40,11 +40,13 @@ static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to) struct inode *inode = file_inode(iocb->ki_filp); ssize_t ret; - if (!inode_trylock_shared(inode)) { - if (iocb->ki_flags & IOCB_NOWAIT) + if (iocb->ki_flags & IOCB_NOWAIT) { + if (!inode_trylock_shared(inode)) return -EAGAIN; + } else { inode_lock_shared(inode); } + /* * Recheck under inode lock - at this point we are sure it cannot * change anymore @@ -190,11 +192,13 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) struct inode *inode = file_inode(iocb->ki_filp); ssize_t ret; - if (!inode_trylock(inode)) { - if (iocb->ki_flags & IOCB_NOWAIT) + if (iocb->ki_flags & IOCB_NOWAIT) { + if (!inode_trylock(inode)) return -EAGAIN; + } else { inode_lock(inode); } + ret = ext4_write_checks(iocb, from); if (ret <= 0) goto out; @@ -233,9 +237,10 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) if (!o_direct && (iocb->ki_flags & IOCB_NOWAIT)) return -EOPNOTSUPP; - if (!inode_trylock(inode)) { - if (iocb->ki_flags & IOCB_NOWAIT) + if (iocb->ki_flags & IOCB_NOWAIT) { + if (!inode_trylock(inode)) return -EAGAIN; + } else { inode_lock(inode); }