Merge branch 'merge'
[linux-2.6] / fs / nfs / callback_proc.c
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
14 #define NFSDBG_FACILITY NFSDBG_CALLBACK
15  
16 unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
17 {
18         struct nfs4_client *clp;
19         struct nfs_delegation *delegation;
20         struct nfs_inode *nfsi;
21         struct inode *inode;
22         
23         res->bitmap[0] = res->bitmap[1] = 0;
24         res->status = htonl(NFS4ERR_BADHANDLE);
25         clp = nfs4_find_client(&args->addr->sin_addr);
26         if (clp == NULL)
27                 goto out;
28         inode = nfs_delegation_find_inode(clp, &args->fh);
29         if (inode == NULL)
30                 goto out_putclient;
31         nfsi = NFS_I(inode);
32         down_read(&nfsi->rwsem);
33         delegation = nfsi->delegation;
34         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
35                 goto out_iput;
36         res->size = i_size_read(inode);
37         res->change_attr = delegation->change_attr;
38         if (nfsi->npages != 0)
39                 res->change_attr++;
40         res->ctime = inode->i_ctime;
41         res->mtime = inode->i_mtime;
42         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
43                 args->bitmap[0];
44         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
45                 args->bitmap[1];
46         res->status = 0;
47 out_iput:
48         up_read(&nfsi->rwsem);
49         iput(inode);
50 out_putclient:
51         nfs4_put_client(clp);
52 out:
53         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
54         return res->status;
55 }
56
57 unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
58 {
59         struct nfs4_client *clp;
60         struct inode *inode;
61         unsigned res;
62         
63         res = htonl(NFS4ERR_BADHANDLE);
64         clp = nfs4_find_client(&args->addr->sin_addr);
65         if (clp == NULL)
66                 goto out;
67         inode = nfs_delegation_find_inode(clp, &args->fh);
68         if (inode == NULL)
69                 goto out_putclient;
70         /* Set up a helper thread to actually return the delegation */
71         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
72                 case 0:
73                         res = 0;
74                         break;
75                 case -ENOENT:
76                         res = htonl(NFS4ERR_BAD_STATEID);
77                         break;
78                 default:
79                         res = htonl(NFS4ERR_RESOURCE);
80         }
81         iput(inode);
82 out_putclient:
83         nfs4_put_client(clp);
84 out:
85         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
86         return res;
87 }