1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2000-2001 Christoph Hellwig.
4 */
5
6/*
7 * Veritas filesystem driver - support for 'immed' inodes.
8 */
9#include <linux/fs.h>
10#include <linux/pagemap.h>
11
12#include "vxfs.h"
13#include "vxfs_extern.h"
14#include "vxfs_inode.h"
15
16/**
17 * vxfs_immed_read_folio - read part of an immed inode into pagecache
18 * @fp:		file context (unused)
19 * @folio:	folio to fill in.
20 *
21 * Description:
22 *   vxfs_immed_read_folio reads a part of the immed area of the
23 *   file that hosts @folio into the pagecache.
24 *
25 * Returns:
26 *   Zero on success, else a negative error code.
27 *
28 * Locking status:
29 *   @folio is locked and will be unlocked.
30 */
31static int vxfs_immed_read_folio(struct file *fp, struct folio *folio)
32{
33	struct vxfs_inode_info *vip = VXFS_INO(folio->mapping->host);
34	void *src = vip->vii_immed.vi_immed + folio_pos(folio);
35	unsigned long i;
36
37	for (i = 0; i < folio_nr_pages(folio); i++) {
38		memcpy_to_page(folio_page(folio, i), 0, src, PAGE_SIZE);
39		src += PAGE_SIZE;
40	}
41
42	folio_mark_uptodate(folio);
43	folio_unlock(folio);
44
45	return 0;
46}
47
48/*
49 * Address space operations for immed files and directories.
50 */
51const struct address_space_operations vxfs_immed_aops = {
52	.read_folio =	vxfs_immed_read_folio,
53};
54