summaryrefslogtreecommitdiffstats
path: root/fs/nfs/callback_proc.c
blob: f731bbe7ac6ad54b36560f323459279ebf29bc71 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * linux/fs/nfs/callback_proc.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback procedures
 */
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"

#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif
 
__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
{
	struct nfs_client *clp;
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: GETATTR callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	inode = nfs_delegation_find_inode(clp, &args->fh);
	if (inode == NULL)
		goto out_putclient;
	nfsi = NFS_I(inode);
	down_read(&nfsi->rwsem);
	delegation = nfsi->delegation;
	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
		goto out_iput;
	res->size = i_size_read(inode);
	res->change_attr = delegation->change_attr;
	if (nfsi->npages != 0)
		res->change_attr++;
	res->ctime = inode->i_ctime;
	res->mtime = inode->i_mtime;
	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
		args->bitmap[0];
	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
		args->bitmap[1];
	res->status = 0;
out_iput:
	up_read(&nfsi->rwsem);
	iput(inode);
out_putclient:
	nfs_put_client(clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
	return res->status;
}

__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
{
	struct nfs_client *clp;
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: RECALL callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	do {
		struct nfs_client *prev = clp;

		inode = nfs_delegation_find_inode(clp, &args->fh);
		if (inode != NULL) {
			/* Set up a helper thread to actually return the delegation */
			switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
				case 0:
					res = 0;
					break;
				case -ENOENT:
					if (res != 0)
						res = htonl(NFS4ERR_BAD_STATEID);
					break;
				default:
					res = htonl(NFS4ERR_RESOURCE);
			}
			iput(inode);
		}
		clp = nfs_find_client_next(prev);
		nfs_put_client(prev);
	} while (clp != NULL);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
	return res;
}

#if defined(CONFIG_NFS_V4_1)

/* FIXME: validate args->cbs_{sequence,slot}id */
/* FIXME: referring calls should be processed */
unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
				struct cb_sequenceres *res)
{
	int i;
	unsigned status = 0;

	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);

	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	       sizeof(res->csr_sessionid));
	res->csr_sequenceid = args->csa_sequenceid;
	res->csr_slotid = args->csa_slotid;
	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;

	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	res->csr_status = status;
	return status;
}

#endif /* CONFIG_NFS_V4_1 */
OpenPOWER on IntegriCloud