From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 837D26B026A for ; Fri, 6 Oct 2017 18:42:32 -0400 (EDT) Received: by mail-pf0-f200.google.com with SMTP id t63so3638756pfi.5 for ; Fri, 06 Oct 2017 15:42:32 -0700 (PDT) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTPS id i14si1964486pgc.59.2017.10.06.15.42.31 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Oct 2017 15:42:31 -0700 (PDT) Subject: [PATCH v7 09/12] xfs: wire up ->lease_direct() From: Dan Williams Date: Fri, 06 Oct 2017 15:36:06 -0700 Message-ID: <150732936625.22363.7638037715540836828.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <150732931273.22363.8436792888326501071.stgit@dwillia2-desk3.amr.corp.intel.com> References: <150732931273.22363.8436792888326501071.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-nvdimm@lists.01.org Cc: linux-xfs@vger.kernel.org, Jan Kara , "Darrick J. Wong" , linux-rdma@vger.kernel.org, linux-api@vger.kernel.org, Dave Chinner , Christoph Hellwig , "J. Bruce Fields" , linux-mm@kvack.org, Jeff Moyer , linux-fsdevel@vger.kernel.org, Jeff Layton , Ross Zwisler A 'lease_direct' lease requires that the vma have a valid MAP_DIRECT mapping established. For xfs we establish a new lease and then check if the MAP_DIRECT mapping has been broken. We want to be sure that the process will receive notification that the MAP_DIRECT mapping is being torn down so it knows why other code paths are throwing failures. For example in the RDMA/ibverbs case we want ibv_reg_mr() to fail if the MAP_DIRECT mapping is invalid or in the process of being invalidated. Cc: Jan Kara Cc: Jeff Moyer Cc: Christoph Hellwig Cc: Dave Chinner Cc: "Darrick J. Wong" Cc: Ross Zwisler Cc: Jeff Layton Cc: "J. Bruce Fields" Signed-off-by: Dan Williams --- fs/xfs/xfs_file.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index e35518600e28..823b65f17429 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1166,6 +1166,33 @@ xfs_filemap_direct_close( put_map_direct_vma(vma->vm_private_data); } +static struct lease_direct * +xfs_filemap_direct_lease( + struct vm_area_struct *vma, + void (*break_fn)(void *), + void *owner) +{ + struct lease_direct *ld; + + ld = map_direct_lease(vma, break_fn, owner); + + if (IS_ERR(ld)) + return ld; + + /* + * We now have an established lease while the base MAP_DIRECT + * lease was not broken. So, we know that the "lease holder" will + * receive a SIGIO notification when the lease is broken and + * take any necessary cleanup actions. + */ + if (!is_map_direct_broken(vma->vm_private_data)) + return ld; + + map_direct_lease_destroy(ld); + + return ERR_PTR(-ENXIO); +} + static const struct vm_operations_struct xfs_file_vm_direct_ops = { .fault = xfs_filemap_fault, .huge_fault = xfs_filemap_huge_fault, @@ -1175,6 +1202,7 @@ static const struct vm_operations_struct xfs_file_vm_direct_ops = { .open = xfs_filemap_direct_open, .close = xfs_filemap_direct_close, + .lease_direct = xfs_filemap_direct_lease, }; static const struct vm_operations_struct xfs_file_vm_ops = { -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org