+ ext4-huge-page-fault-support.patch added to -mm tree

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The patch titled
     Subject: ext4: huge page fault support
has been added to the -mm tree.  Its filename is
     ext4-huge-page-fault-support.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/ext4-huge-page-fault-support.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/ext4-huge-page-fault-support.patch

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------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Subject: ext4: huge page fault support

Use DAX to provide support for huge pages.

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Hillf Danton <dhillf@xxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/ext4/file.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff -puN fs/ext4/file.c~ext4-huge-page-fault-support fs/ext4/file.c
--- a/fs/ext4/file.c~ext4-huge-page-fault-support
+++ a/fs/ext4/file.c
@@ -211,6 +211,13 @@ static int ext4_dax_fault(struct vm_area
 					/* Is this the right get_block? */
 }
 
+static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
+						pmd_t *pmd, unsigned int flags)
+{
+	return dax_pmd_fault(vma, addr, pmd, flags, ext4_get_block_write,
+				ext4_end_io_unwritten);
+}
+
 static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	return dax_mkwrite(vma, vmf, ext4_get_block, ext4_end_io_unwritten);
@@ -218,6 +225,7 @@ static int ext4_dax_mkwrite(struct vm_ar
 
 static const struct vm_operations_struct ext4_dax_vm_ops = {
 	.fault		= ext4_dax_fault,
+	.pmd_fault	= ext4_dax_pmd_fault,
 	.page_mkwrite	= ext4_dax_mkwrite,
 	.pfn_mkwrite	= dax_pfn_mkwrite,
 };
@@ -245,7 +253,7 @@ static int ext4_file_mmap(struct file *f
 	file_accessed(file);
 	if (IS_DAX(file_inode(file))) {
 		vma->vm_ops = &ext4_dax_vm_ops;
-		vma->vm_flags |= VM_MIXEDMAP;
+		vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
 	} else {
 		vma->vm_ops = &ext4_file_vm_ops;
 	}
_

Patches currently in -mm which might be from willy@xxxxxxxxxxxxxxx are

mm-make-gup-handle-pfn-mapping-unless-foll_get-is-requested.patch
dax-move-dax-related-functions-to-a-new-header.patch
thp-prepare-for-dax-huge-pages.patch
mm-add-a-pmd_fault-handler.patch
mm-export-various-functions-for-the-benefit-of-dax.patch
mm-add-vmf_insert_pfn_pmd.patch
dax-add-huge-page-fault-support.patch
ext2-huge-page-fault-support.patch
ext4-huge-page-fault-support.patch
xfs-huge-page-fault-support.patch

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