1/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
8#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
10#include "nfs4_fs.h"
11#include "callback.h"
12#include "delegation.h"
13#include "internal.h"
14
15#define NFSDBG_FACILITY NFSDBG_CALLBACK
16
17__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
18{
19	struct nfs_client *clp;
20	struct nfs_delegation *delegation;
21	struct nfs_inode *nfsi;
22	struct inode *inode;
23
24	res->bitmap[0] = res->bitmap[1] = 0;
25	res->status = htonl(NFS4ERR_BADHANDLE);
26	clp = nfs_find_client(args->addr, 4);
27	if (clp == NULL)
28		goto out;
29	inode = nfs_delegation_find_inode(clp, &args->fh);
30	if (inode == NULL)
31		goto out_putclient;
32	nfsi = NFS_I(inode);
33	down_read(&nfsi->rwsem);
34	delegation = nfsi->delegation;
35	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
36		goto out_iput;
37	res->size = i_size_read(inode);
38	res->change_attr = delegation->change_attr;
39	if (nfsi->npages != 0)
40		res->change_attr++;
41	res->ctime = inode->i_ctime;
42	res->mtime = inode->i_mtime;
43	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
44		args->bitmap[0];
45	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
46		args->bitmap[1];
47	res->status = 0;
48out_iput:
49	up_read(&nfsi->rwsem);
50	iput(inode);
51out_putclient:
52	nfs_put_client(clp);
53out:
54	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
55	return res->status;
56}
57
58__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
59{
60	struct nfs_client *clp;
61	struct inode *inode;
62	__be32 res;
63
64	res = htonl(NFS4ERR_BADHANDLE);
65	clp = nfs_find_client(args->addr, 4);
66	if (clp == NULL)
67		goto out;
68	inode = nfs_delegation_find_inode(clp, &args->fh);
69	if (inode == NULL)
70		goto out_putclient;
71	/* Set up a helper thread to actually return the delegation */
72	switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
73		case 0:
74			res = 0;
75			break;
76		case -ENOENT:
77			res = htonl(NFS4ERR_BAD_STATEID);
78			break;
79		default:
80			res = htonl(NFS4ERR_RESOURCE);
81	}
82	iput(inode);
83out_putclient:
84	nfs_put_client(clp);
85out:
86	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
87	return res;
88}
89