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/efs_fs.h>
11 #include <linux/pagemap.h>
12 #include <linux/smp_lock.h>
13
14 static int efs_symlink_readpage(struct file *file, struct page *page)
15 {
16 char *link = kmap(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 lock_kernel();
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 unlock_kernel();
43 SetPageUptodate(page);
44 kunmap(page);
45 UnlockPage(page);
46 return 0;
47 fail:
48 unlock_kernel();
49 SetPageError(page);
50 kunmap(page);
51 UnlockPage(page);
52 return err;
53 }
54
55 struct address_space_operations efs_symlink_aops = {
56 readpage: efs_symlink_readpage
57 };
58
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