1/*
 2 * symlink.c
 3 *
 4 * Copyright (c) 1999 Al Smith
 5 *
 6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 7 */
 8
 9#include <linux/string.h>
10#include <linux/pagemap.h>
11#include <linux/buffer_head.h>
12#include "efs.h"
13
14static int efs_symlink_readpage(struct file *file, struct page *page)
15{
 
16	char *link = page_address(page);
17	struct buffer_head * bh;
18	struct inode * inode = page->mapping->host;
19	efs_block_t size = inode->i_size;
20	int err;
21  
22	err = -ENAMETOOLONG;
23	if (size > 2 * EFS_BLOCKSIZE)
24		goto fail;
25  
26	/* read first 512 bytes of link target */
27	err = -EIO;
28	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
29	if (!bh)
30		goto fail;
31	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
32	brelse(bh);
33	if (size > EFS_BLOCKSIZE) {
34		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
35		if (!bh)
36			goto fail;
37		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
38		brelse(bh);
39	}
40	link[size] = '\0';
41	SetPageUptodate(page);
42	unlock_page(page);
43	return 0;
44fail:
45	SetPageError(page);
46	unlock_page(page);
47	return err;
48}
49
50const struct address_space_operations efs_symlink_aops = {
51	.readpage	= efs_symlink_readpage
52};

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * symlink.c
 4 *
 5 * Copyright (c) 1999 Al Smith
 6 *
 7 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 8 */
 9
10#include <linux/string.h>
11#include <linux/pagemap.h>
12#include <linux/buffer_head.h>
13#include "efs.h"
14
15static int efs_symlink_read_folio(struct file *file, struct folio *folio)
16{
17	struct page *page = &folio->page;
18	char *link = page_address(page);
19	struct buffer_head * bh;
20	struct inode * inode = page->mapping->host;
21	efs_block_t size = inode->i_size;
22	int err;
23  
24	err = -ENAMETOOLONG;
25	if (size > 2 * EFS_BLOCKSIZE)
26		goto fail;
27  
28	/* read first 512 bytes of link target */
29	err = -EIO;
30	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
31	if (!bh)
32		goto fail;
33	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
34	brelse(bh);
35	if (size > EFS_BLOCKSIZE) {
36		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
37		if (!bh)
38			goto fail;
39		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
40		brelse(bh);
41	}
42	link[size] = '\0';
43	SetPageUptodate(page);
44	unlock_page(page);
45	return 0;
46fail:
47	SetPageError(page);
48	unlock_page(page);
49	return err;
50}
51
52const struct address_space_operations efs_symlink_aops = {
53	.read_folio	= efs_symlink_read_folio
54};