linux-kernel - [PATCH v2 5/5] block: call dax_get_unmapped

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Message-Id: <1460493572-31667-4-git-send-email-toshi.kani@hpe.com>
Date:	Tue, 12 Apr 2016 14:39:32 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	akpm@...ux-foundation.org, dan.j.williams@...el.com
Cc:	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@....com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: [PATCH v2 5/5] block: call dax_get_unmapped_area() for DAX pmd mappings

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 <toshi.kani@....com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Matthew Wilcox <willy@...ux.intel.com>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
---
 fs/block_dev.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 20a2c02..0274802 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1798,6 +1798,9 @@ const struct file_operations def_blk_fops = {
 	.write_iter	= blkdev_write_iter,
 	.mmap		= blkdev_mmap,
 	.fsync		= blkdev_fsync,
+#ifdef CONFIG_FS_DAX
+	.get_unmapped_area = dax_get_unmapped_area,
+#endif
 	.unlocked_ioctl	= block_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= compat_blkdev_ioctl,