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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