Merge master.kernel.org:/pub/scm/linux/kernel/git/tmlind/linux-omap-upstream into...
[sfrench/cifs-2.6.git] / 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 #include "internal.h"
14
15 #define NFSDBG_FACILITY NFSDBG_CALLBACK
16  
17 unsigned 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;
48 out_iput:
49         up_read(&nfsi->rwsem);
50         iput(inode);
51 out_putclient:
52         nfs_put_client(clp);
53 out:
54         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
55         return res->status;
56 }
57
58 unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
59 {
60         struct nfs_client *clp;
61         struct inode *inode;
62         unsigned 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);
83 out_putclient:
84         nfs_put_client(clp);
85 out:
86         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
87         return res;
88 }