Commit f7616782 authored by Zhang Yi's avatar Zhang Yi
Browse files

ext4: implement mmap iomap path 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9DN5Z


CVE: NA

--------------------------------

Add ext4_iomap_page_mkwrite() for the mmap iomap path. It dirty folio
and map blocks, almost all work have been done in iomap_page_mkwrite(),
so call it directly.

Signed-off-by: default avatarZhang Yi <yi.zhang@huawei.com>
parent 7f6416dc

fs/ext4/inode.c

+25 −0
Original line number Diff line number Diff line
@@ -6514,6 +6514,26 @@ static int ext4_bh_unmapped(handle_t *handle, struct inode *inode, 
	return !buffer_mapped(bh);

}



static vm_fault_t ext4_iomap_page_mkwrite(struct vm_fault *vmf)

{

	struct inode *inode = file_inode(vmf->vma->vm_file);

	const struct iomap_ops *iomap_ops;



	/*

	 * ext4_nonda_switch() could writeback this folio, so have to

	 * call it before lock folio.

	 *

	 * TODO: drop ext4_nonda_switch() after reserving enough sapce

	 * for metadata and merge delalloc and nodelalloc operations.

	 */

	if (test_opt(inode->i_sb, DELALLOC) && !ext4_nonda_switch(inode->i_sb))

		iomap_ops = &ext4_iomap_buffered_da_write_ops;

	else

		iomap_ops = &ext4_iomap_buffered_write_ops;



	return iomap_page_mkwrite(vmf, iomap_ops);

}



vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf)

{

	struct vm_area_struct *vma = vmf->vma;
@@ -6537,6 +6557,11 @@ vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf) 


	filemap_invalidate_lock_shared(mapping);



	if (ext4_test_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP)) {

		ret = ext4_iomap_page_mkwrite(vmf);

		goto out;

	}



	err = ext4_convert_inline_data(inode);

	if (err)

		goto out_ret;