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14#include <linux/time.h>
15#include <linux/errno.h>
16#include <linux/sunrpc/clnt.h>
17#include <linux/nfs.h>
18#include <linux/nfs2.h>
19#include <linux/nfs_fs.h>
20#include <linux/pagemap.h>
21#include <linux/stat.h>
22#include <linux/mm.h>
23#include <linux/string.h>
24
25
26
27
28
29static 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
40error:
41 SetPageError(page);
42 unlock_page(page);
43 return -EIO;
44}
45
46static const char *nfs_get_link(struct dentry *dentry,
47 struct inode *inode,
48 struct delayed_call *done)
49{
50 struct page *page;
51 void *err;
52
53 if (!dentry) {
54 err = ERR_PTR(nfs_revalidate_mapping_rcu(inode));
55 if (err)
56 return err;
57 page = find_get_page(inode->i_mapping, 0);
58 if (!page)
59 return ERR_PTR(-ECHILD);
60 if (!PageUptodate(page)) {
61 put_page(page);
62 return ERR_PTR(-ECHILD);
63 }
64 } else {
65 err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
66 if (err)
67 return err;
68 page = read_cache_page(&inode->i_data, 0,
69 (filler_t *)nfs_symlink_filler, inode);
70 if (IS_ERR(page))
71 return ERR_CAST(page);
72 }
73 set_delayed_call(done, page_put_link, page);
74 return page_address(page);
75}
76
77
78
79
80const struct inode_operations nfs_symlink_inode_operations = {
81 .get_link = nfs_get_link,
82 .getattr = nfs_getattr,
83 .setattr = nfs_setattr,
84};
85