1/*
 2 * Copyright (c) 2000-2001 Christoph Hellwig.
 3 * All rights reserved.
 4 *
 5 * Redistribution and use in source and binary forms, with or without
 6 * modification, are permitted provided that the following conditions
 7 * are met:
 8 * 1. Redistributions of source code must retain the above copyright
 9 *    notice, this list of conditions, and the following disclaimer,
10 *    without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 *    derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Veritas filesystem driver - support for 'immed' inodes.
32 */
33#include <linux/fs.h>
34#include <linux/pagemap.h>
35
36#include "vxfs.h"
37#include "vxfs_extern.h"
38#include "vxfs_inode.h"
39
40
41static int	vxfs_immed_readpage(struct file *, struct page *);
42
43/*
44 * Address space operations for immed files and directories.
45 */
46const struct address_space_operations vxfs_immed_aops = {
47	.readpage =		vxfs_immed_readpage,
48};
49
50/**
51 * vxfs_immed_readpage - read part of an immed inode into pagecache
52 * @file:	file context (unused)
53 * @page:	page frame to fill in.
54 *
55 * Description:
56 *   vxfs_immed_readpage reads a part of the immed area of the
57 *   file that hosts @pp into the pagecache.
58 *
59 * Returns:
60 *   Zero on success, else a negative error code.
61 *
62 * Locking status:
63 *   @page is locked and will be unlocked.
64 */
65static int
66vxfs_immed_readpage(struct file *fp, struct page *pp)
67{
68	struct vxfs_inode_info	*vip = VXFS_INO(pp->mapping->host);
69	u_int64_t	offset = (u_int64_t)pp->index << PAGE_SHIFT;
70	caddr_t		kaddr;
71
72	kaddr = kmap(pp);
73	memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE);
74	kunmap(pp);
75	
76	flush_dcache_page(pp);
77	SetPageUptodate(pp);
78        unlock_page(pp);
79
80	return 0;
81}

 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 * @file:	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};