2 * linux/fs/nfs/symlink.c
4 * Copyright (C) 1992 Rick Sladkey
6 * Optimization changes Copyright (C) 1994 Florian La Roche
8 * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
10 * nfs symlink handling code
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>
22 #include <linux/string.h>
24 /* Symlink caching in the page cache is even more simplistic
25 * and straight-forward than readdir caching.
28 static int nfs_symlink_filler(struct inode *inode, struct page *page)
32 error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE);
35 SetPageUptodate(page);
45 static const char *nfs_get_link(struct dentry *dentry,
46 struct inode *inode, void **cookie)
52 err = ERR_PTR(nfs_revalidate_mapping_rcu(inode));
55 page = find_get_page(inode->i_mapping, 0);
57 return ERR_PTR(-ECHILD);
58 if (!PageUptodate(page)) {
60 return ERR_PTR(-ECHILD);
63 err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
66 page = read_cache_page(&inode->i_data, 0,
67 (filler_t *)nfs_symlink_filler, inode);
69 return ERR_CAST(page);
72 return page_address(page);
76 * symlinks can't do much...
78 const struct inode_operations nfs_symlink_inode_operations = {
79 .readlink = generic_readlink,
80 .get_link = nfs_get_link,
81 .put_link = page_put_link,
82 .getattr = nfs_getattr,
83 .setattr = nfs_setattr,