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-rw-r--r--fs/ext4/file.c55
1 files changed, 52 insertions, 3 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index d5219e4cd91d..113837e7ba98 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -207,14 +207,63 @@ static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- return dax_fault(vma, vmf, ext4_get_block_dax, ext4_end_io_unwritten);
+ int result;
+ handle_t *handle = NULL;
+ struct super_block *sb = file_inode(vma->vm_file)->i_sb;
+ bool write = vmf->flags & FAULT_FLAG_WRITE;
+
+ if (write) {
+ sb_start_pagefault(sb);
+ file_update_time(vma->vm_file);
+ handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
+ EXT4_DATA_TRANS_BLOCKS(sb));
+ }
+
+ if (IS_ERR(handle))
+ result = VM_FAULT_SIGBUS;
+ else
+ result = __dax_fault(vma, vmf, ext4_get_block_dax,
+ ext4_end_io_unwritten);
+
+ if (write) {
+ if (!IS_ERR(handle))
+ ext4_journal_stop(handle);
+ sb_end_pagefault(sb);
+ }
+
+ return result;
}
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_dax,
- ext4_end_io_unwritten);
+ 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);
+ handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
+ ext4_chunk_trans_blocks(inode,
+ PMD_SIZE / PAGE_SIZE));
+ }
+
+ if (IS_ERR(handle))
+ result = VM_FAULT_SIGBUS;
+ else
+ result = __dax_pmd_fault(vma, addr, pmd, flags,
+ ext4_get_block_dax, ext4_end_io_unwritten);
+
+ if (write) {
+ if (!IS_ERR(handle))
+ ext4_journal_stop(handle);
+ sb_end_pagefault(sb);
+ }
+
+ return result;
}
static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)