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 | 14 | |
356d9fbb | 15 | static int efs_symlink_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 16 | { |
356d9fbb | 17 | struct page *page = &folio->page; |
21fc61c7 | 18 | char *link = page_address(page); |
1da177e4 LT |
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) | |
e7ec952f | 26 | goto fail; |
1da177e4 | 27 | |
1da177e4 LT |
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'; | |
1da177e4 | 43 | SetPageUptodate(page); |
1da177e4 LT |
44 | unlock_page(page); |
45 | return 0; | |
46 | fail: | |
1da177e4 | 47 | SetPageError(page); |
1da177e4 LT |
48 | unlock_page(page); |
49 | return err; | |
50 | } | |
51 | ||
f5e54d6e | 52 | const struct address_space_operations efs_symlink_aops = { |
356d9fbb | 53 | .read_folio = efs_symlink_read_folio |
1da177e4 | 54 | }; |