From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Use DAX to provide support for huge pages.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
fs/ext4/file.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 9c7bde5..9e3b4d3 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -198,6 +198,12 @@ static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
/* 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);
+}
+
static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
return dax_mkwrite(vma, vmf, ext4_get_block);
@@ -205,6 +211,7 @@ static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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,
.remap_pages = generic_file_remap_pages,
};
@@ -224,7 +231,7 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
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;
}
--
2.1.0
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