Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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> | |
1da177e4 LT |
11 | #include <linux/pagemap.h> |
12 | #include <linux/buffer_head.h> | |
45254b4f | 13 | #include "efs.h" |
1da177e4 LT |
14 | |
15 | static int efs_symlink_readpage(struct file *file, struct page *page) | |
16 | { | |
21fc61c7 | 17 | char *link = page_address(page); |
1da177e4 LT |
18 | struct buffer_head * bh; |
19 | struct inode * inode = page->mapping->host; | |
20 | efs_block_t size = inode->i_size; | |
21 | int err; | |
22 | ||
23 | err = -ENAMETOOLONG; | |
24 | if (size > 2 * EFS_BLOCKSIZE) | |
e7ec952f | 25 | goto fail; |
1da177e4 | 26 | |
1da177e4 LT |
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'; | |
1da177e4 | 42 | SetPageUptodate(page); |
1da177e4 LT |
43 | unlock_page(page); |
44 | return 0; | |
45 | fail: | |
1da177e4 | 46 | SetPageError(page); |
1da177e4 LT |
47 | unlock_page(page); |
48 | return err; | |
49 | } | |
50 | ||
f5e54d6e | 51 | const struct address_space_operations efs_symlink_aops = { |
1da177e4 LT |
52 | .readpage = efs_symlink_readpage |
53 | }; |