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	char *link = folio_address(folio);
18	struct buffer_head *bh;
19	struct inode *inode = folio->mapping->host;
 
20	efs_block_t size = inode->i_size;
21	int err;
22  
23	err = -ENAMETOOLONG;
24	if (size > 2 * EFS_BLOCKSIZE)
25		goto fail;
26  
27	/* read first 512 bytes of link target */
28	err = -EIO;
29	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
30	if (!bh)
31		goto fail;
32	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
33	brelse(bh);
34	if (size > EFS_BLOCKSIZE) {
35		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
36		if (!bh)
37			goto fail;
38		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
39		brelse(bh);
40	}
41	link[size] = '\0';
42	err = 0;
 
 
43fail:
44	folio_end_read(folio, err == 0);
 
45	return err;
46}
47
48const struct address_space_operations efs_symlink_aops = {
49	.read_folio	= efs_symlink_read_folio
50};

 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};