NFS: Clean up nfs_sb_active/nfs_sb_deactive
[linux-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 #ifdef NFS_DEBUG
16 #define NFSDBG_FACILITY NFSDBG_CALLBACK
17 #endif
18  
19 __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
20 {
21         struct nfs_client *clp;
22         struct nfs_delegation *delegation;
23         struct nfs_inode *nfsi;
24         struct inode *inode;
25
26         res->bitmap[0] = res->bitmap[1] = 0;
27         res->status = htonl(NFS4ERR_BADHANDLE);
28         clp = nfs_find_client(args->addr, 4);
29         if (clp == NULL)
30                 goto out;
31
32         dprintk("NFS: GETATTR callback request from %s\n",
33                 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
34
35         inode = nfs_delegation_find_inode(clp, &args->fh);
36         if (inode == NULL)
37                 goto out_putclient;
38         nfsi = NFS_I(inode);
39         down_read(&nfsi->rwsem);
40         delegation = nfsi->delegation;
41         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
42                 goto out_iput;
43         res->size = i_size_read(inode);
44         res->change_attr = delegation->change_attr;
45         if (nfsi->npages != 0)
46                 res->change_attr++;
47         res->ctime = inode->i_ctime;
48         res->mtime = inode->i_mtime;
49         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
50                 args->bitmap[0];
51         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
52                 args->bitmap[1];
53         res->status = 0;
54 out_iput:
55         up_read(&nfsi->rwsem);
56         iput(inode);
57 out_putclient:
58         nfs_put_client(clp);
59 out:
60         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
61         return res->status;
62 }
63
64 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
65 {
66         struct nfs_client *clp;
67         struct inode *inode;
68         __be32 res;
69         
70         res = htonl(NFS4ERR_BADHANDLE);
71         clp = nfs_find_client(args->addr, 4);
72         if (clp == NULL)
73                 goto out;
74
75         dprintk("NFS: RECALL callback request from %s\n",
76                 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
77
78         do {
79                 struct nfs_client *prev = clp;
80
81                 inode = nfs_delegation_find_inode(clp, &args->fh);
82                 if (inode != NULL) {
83                         /* Set up a helper thread to actually return the delegation */
84                         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
85                                 case 0:
86                                         res = 0;
87                                         break;
88                                 case -ENOENT:
89                                         if (res != 0)
90                                                 res = htonl(NFS4ERR_BAD_STATEID);
91                                         break;
92                                 default:
93                                         res = htonl(NFS4ERR_RESOURCE);
94                         }
95                         iput(inode);
96                 }
97                 clp = nfs_find_client_next(prev);
98                 nfs_put_client(prev);
99         } while (clp != NULL);
100 out:
101         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
102         return res;
103 }