From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Call into DAX to provide support for PUD pages, just like the PMD cases.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
fs/ext4/file.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 60683ab..b0cba51 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -262,6 +262,42 @@ static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
return result;
}
+static int ext4_dax_pud_fault(struct vm_area_struct *vma, unsigned long addr,
+ pud_t *pud, unsigned int flags)
+{
+ int result;
+ handle_t *handle = NULL;
+ struct inode *inode = file_inode(vma->vm_file);
+ struct super_block *sb = inode->i_sb;
+ bool write = flags & FAULT_FLAG_WRITE;
+
+ if (write) {
+ sb_start_pagefault(sb);
+ file_update_time(vma->vm_file);
+ down_read(&EXT4_I(inode)->i_mmap_sem);
+ handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
+ ext4_chunk_trans_blocks(inode,
+ PMD_SIZE / PAGE_SIZE));
+ } else
+ down_read(&EXT4_I(inode)->i_mmap_sem);
+
+ if (IS_ERR(handle))
+ result = VM_FAULT_SIGBUS;
+ else
+ result = __dax_pud_fault(vma, addr, pud, flags,
+ ext4_dax_mmap_get_block, NULL);
+
+ if (write) {
+ if (!IS_ERR(handle))
+ ext4_journal_stop(handle);
+ up_read(&EXT4_I(inode)->i_mmap_sem);
+ sb_end_pagefault(sb);
+ } else
+ up_read(&EXT4_I(inode)->i_mmap_sem);
+
+ return result;
+}
+
static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
int err;
@@ -309,6 +345,7 @@ static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
static const struct vm_operations_struct ext4_dax_vm_ops = {
.fault = ext4_dax_fault,
.pmd_fault = ext4_dax_pmd_fault,
+ .pud_fault = ext4_dax_pud_fault,
.page_mkwrite = ext4_dax_mkwrite,
.pfn_mkwrite = ext4_dax_pfn_mkwrite,
};
--
2.6.2
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