blob: 3d9a350e3e7f6f8687726c7e962a55dbca39a3a8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/efs_fs.h>
11#include <linux/pagemap.h>
12#include <linux/buffer_head.h>
13#include <linux/smp_lock.h>
14
15static int efs_symlink_readpage(struct file *file, struct page *page)
16{
17 char *link = kmap(page);
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)
25 goto fail;
26
27 lock_kernel();
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 unlock_kernel();
44 SetPageUptodate(page);
45 kunmap(page);
46 unlock_page(page);
47 return 0;
48fail:
49 unlock_kernel();
50 SetPageError(page);
51 kunmap(page);
52 unlock_page(page);
53 return err;
54}
55
56struct address_space_operations efs_symlink_aops = {
57 .readpage = efs_symlink_readpage
58};