Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
1da177e4 | 22 | #include <linux/string.h> |
1da177e4 LT |
23 | |
24 | /* Symlink caching in the page cache is even more simplistic | |
25 | * and straight-forward than readdir caching. | |
1da177e4 LT |
26 | */ |
27 | ||
1da177e4 LT |
28 | static int nfs_symlink_filler(struct inode *inode, struct page *page) |
29 | { | |
1da177e4 LT |
30 | int error; |
31 | ||
cc314eef | 32 | error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE); |
1da177e4 LT |
33 | if (error < 0) |
34 | goto error; | |
35 | SetPageUptodate(page); | |
36 | unlock_page(page); | |
37 | return 0; | |
38 | ||
39 | error: | |
40 | SetPageError(page); | |
41 | unlock_page(page); | |
42 | return -EIO; | |
43 | } | |
44 | ||
6e77137b | 45 | static const char *nfs_follow_link(struct dentry *dentry, void **cookie) |
1da177e4 | 46 | { |
2b0143b5 | 47 | struct inode *inode = d_inode(dentry); |
1da177e4 | 48 | struct page *page; |
717d44e8 TM |
49 | void *err; |
50 | ||
1cda707d | 51 | err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping)); |
1da177e4 | 52 | if (err) |
680baacb | 53 | return err; |
1da177e4 LT |
54 | page = read_cache_page(&inode->i_data, 0, |
55 | (filler_t *)nfs_symlink_filler, inode); | |
680baacb AV |
56 | if (IS_ERR(page)) |
57 | return ERR_CAST(page); | |
58 | *cookie = page; | |
59 | return kmap(page); | |
1da177e4 LT |
60 | } |
61 | ||
1da177e4 LT |
62 | /* |
63 | * symlinks can't do much... | |
64 | */ | |
92e1d5be | 65 | const struct inode_operations nfs_symlink_inode_operations = { |
1da177e4 LT |
66 | .readlink = generic_readlink, |
67 | .follow_link = nfs_follow_link, | |
9bf2aa12 | 68 | .put_link = page_put_link, |
1da177e4 LT |
69 | .getattr = nfs_getattr, |
70 | .setattr = nfs_setattr, | |
71 | }; |