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1 | /* |
2 | * linux/fs/nfs/symlink.c |
3 | * |
4 | * Copyright (C) 1992 Rick Sladkey |
5 | * |
6 | * Optimization changes Copyright (C) 1994 Florian La Roche |
7 | * |
8 | * Jun 7 1999, cache symlink lookups in the page cache. -DaveM |
9 | * |
10 | * nfs symlink handling code |
11 | */ |
12 | |
13 | #include <linux/time.h> |
14 | #include <linux/errno.h> |
15 | #include <linux/sunrpc/clnt.h> |
16 | #include <linux/nfs.h> |
17 | #include <linux/nfs2.h> |
18 | #include <linux/nfs_fs.h> |
19 | #include <linux/pagemap.h> |
20 | #include <linux/stat.h> |
21 | #include <linux/mm.h> |
22 | #include <linux/string.h> |
23 | #include <linux/namei.h> |
24 | |
25 | /* Symlink caching in the page cache is even more simplistic |
26 | * and straight-forward than readdir caching. |
27 | */ |
28 | |
29 | static int nfs_symlink_filler(struct inode *inode, struct page *page) |
30 | { |
31 | int error; |
32 | |
33 | error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE); |
34 | if (error < 0) |
35 | goto error; |
36 | SetPageUptodate(page); |
37 | unlock_page(page); |
38 | return 0; |
39 | |
40 | error: |
41 | SetPageError(page); |
42 | unlock_page(page); |
43 | return -EIO; |
44 | } |
45 | |
46 | static void *nfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
47 | { |
48 | struct inode *inode = dentry->d_inode; |
49 | struct page *page; |
50 | void *err; |
51 | |
52 | err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping)); |
53 | if (err) |
54 | goto read_failed; |
55 | page = read_cache_page(&inode->i_data, 0, |
56 | (filler_t *)nfs_symlink_filler, inode); |
57 | if (IS_ERR(page)) { |
58 | err = page; |
59 | goto read_failed; |
60 | } |
61 | nd_set_link(nd, kmap(page)); |
62 | return page; |
63 | |
64 | read_failed: |
65 | nd_set_link(nd, err); |
66 | return NULL; |
67 | } |
68 | |
69 | /* |
70 | * symlinks can't do much... |
71 | */ |
72 | const struct inode_operations nfs_symlink_inode_operations = { |
73 | .readlink = generic_readlink, |
74 | .follow_link = nfs_follow_link, |
75 | .put_link = page_put_link, |
76 | .getattr = nfs_getattr, |
77 | .setattr = nfs_setattr, |
78 | }; |
79 |
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