From: Toshi Kani Subject: [PATCH v2 2/5] ext4: call dax_get_unmapped_area() for DAX pmd mappings Date: Tue, 12 Apr 2016 14:39:29 -0600 Message-ID: <1460493572-31667-1-git-send-email-toshi.kani@hpe.com> Cc: linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Toshi Kani , Theodore Ts'o , Andreas Dilger , Jan Kara , Matthew Wilcox , Ross Zwisler , To: akpm@linux-foundation.org, dan.j.williams@intel.com Return-path: Received: from g9t1613g.houston.hp.com ([15.240.0.71]:41196 "EHLO g9t1613g.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964798AbcDLUsN (ORCPT ); Tue, 12 Apr 2016 16:48:13 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: To support DAX pmd mappings with unmodified applications, filesystems need to align an mmap address by the pmd size. Call dax_get_unmapped_area() from f_op->get_unmapped_area. Note, there is no change in behavior for a non-DAX file. Signed-off-by: Toshi Kani Cc: Theodore Ts'o Cc: Andreas Dilger Cc: Jan Kara Cc: Dan Williams Cc: Matthew Wilcox Cc: Ross Zwisler Cc: --- fs/ext4/file.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index fa2208b..2abc57b 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -708,6 +708,9 @@ const struct file_operations ext4_file_operations = { .open = ext4_file_open, .release = ext4_release_file, .fsync = ext4_sync_file, +#ifdef CONFIG_FS_DAX + .get_unmapped_area = dax_get_unmapped_area, +#endif .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .fallocate = ext4_fallocate,