Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/callback_proc.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFSv4 callback procedures | |
7 | */ | |
1da177e4 LT |
8 | #include <linux/nfs4.h> |
9 | #include <linux/nfs_fs.h> | |
4ce79717 | 10 | #include "nfs4_fs.h" |
1da177e4 LT |
11 | #include "callback.h" |
12 | #include "delegation.h" | |
24c8dbbb | 13 | #include "internal.h" |
1da177e4 | 14 | |
1d98fe67 | 15 | #ifdef NFS_DEBUG |
1da177e4 | 16 | #define NFSDBG_FACILITY NFSDBG_CALLBACK |
1d98fe67 | 17 | #endif |
1da177e4 | 18 | |
e6f684f6 | 19 | __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res) |
1da177e4 | 20 | { |
adfa6f98 | 21 | struct nfs_client *clp; |
1da177e4 LT |
22 | struct nfs_delegation *delegation; |
23 | struct nfs_inode *nfsi; | |
24 | struct inode *inode; | |
1d98fe67 | 25 | |
1da177e4 LT |
26 | res->bitmap[0] = res->bitmap[1] = 0; |
27 | res->status = htonl(NFS4ERR_BADHANDLE); | |
ff052645 | 28 | clp = nfs_find_client(args->addr, 4); |
1da177e4 LT |
29 | if (clp == NULL) |
30 | goto out; | |
1d98fe67 CL |
31 | |
32 | dprintk("NFS: GETATTR callback request from %s\n", | |
33 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
34 | ||
1da177e4 LT |
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); | |
beb2a5ec TM |
44 | res->change_attr = delegation->change_attr; |
45 | if (nfsi->npages != 0) | |
46 | res->change_attr++; | |
1da177e4 LT |
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: | |
24c8dbbb | 58 | nfs_put_client(clp); |
1da177e4 | 59 | out: |
3110ff80 | 60 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
1da177e4 LT |
61 | return res->status; |
62 | } | |
63 | ||
e6f684f6 | 64 | __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy) |
1da177e4 | 65 | { |
adfa6f98 | 66 | struct nfs_client *clp; |
1da177e4 | 67 | struct inode *inode; |
e6f684f6 | 68 | __be32 res; |
1da177e4 LT |
69 | |
70 | res = htonl(NFS4ERR_BADHANDLE); | |
ff052645 | 71 | clp = nfs_find_client(args->addr, 4); |
1da177e4 LT |
72 | if (clp == NULL) |
73 | goto out; | |
1d98fe67 CL |
74 | |
75 | dprintk("NFS: RECALL callback request from %s\n", | |
76 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
77 | ||
3fbd67ad TM |
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); | |
1da177e4 | 100 | out: |
3110ff80 | 101 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
1da177e4 LT |
102 | return res; |
103 | } | |
d49433e1 BH |
104 | |
105 | #if defined(CONFIG_NFS_V4_1) | |
106 | ||
68f3f901 RL |
107 | /* |
108 | * Validate the sequenceID sent by the server. | |
109 | * Return success if the sequenceID is one more than what we last saw on | |
110 | * this slot, accounting for wraparound. Increments the slot's sequence. | |
111 | * | |
112 | * We don't yet implement a duplicate request cache, so at this time | |
113 | * we will log replays, and process them as if we had not seen them before, | |
114 | * but we don't bump the sequence in the slot. Not too worried about it, | |
115 | * since we only currently implement idempotent callbacks anyway. | |
116 | * | |
117 | * We have a single slot backchannel at this time, so we don't bother | |
118 | * checking the used_slots bit array on the table. The lower layer guarantees | |
119 | * a single outstanding callback request at a time. | |
120 | */ | |
121 | static int | |
122 | validate_seqid(struct nfs4_slot_table *tbl, u32 slotid, u32 seqid) | |
123 | { | |
124 | struct nfs4_slot *slot; | |
125 | ||
126 | dprintk("%s enter. slotid %d seqid %d\n", | |
127 | __func__, slotid, seqid); | |
128 | ||
129 | if (slotid > NFS41_BC_MAX_CALLBACKS) | |
130 | return htonl(NFS4ERR_BADSLOT); | |
131 | ||
132 | slot = tbl->slots + slotid; | |
133 | dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr); | |
134 | ||
135 | /* Normal */ | |
136 | if (likely(seqid == slot->seq_nr + 1)) { | |
137 | slot->seq_nr++; | |
138 | return htonl(NFS4_OK); | |
139 | } | |
140 | ||
141 | /* Replay */ | |
142 | if (seqid == slot->seq_nr) { | |
143 | dprintk("%s seqid %d is a replay - no DRC available\n", | |
144 | __func__, seqid); | |
145 | return htonl(NFS4_OK); | |
146 | } | |
147 | ||
148 | /* Wraparound */ | |
149 | if (seqid == 1 && (slot->seq_nr + 1) == 0) { | |
150 | slot->seq_nr = 1; | |
151 | return htonl(NFS4_OK); | |
152 | } | |
153 | ||
154 | /* Misordered request */ | |
155 | return htonl(NFS4ERR_SEQ_MISORDERED); | |
156 | } | |
157 | ||
963891ac RL |
158 | /* |
159 | * Returns a pointer to a held 'struct nfs_client' that matches the server's | |
160 | * address, major version number, and session ID. It is the caller's | |
161 | * responsibility to release the returned reference. | |
162 | * | |
163 | * Returns NULL if there are no connections with sessions, or if no session | |
164 | * matches the one of interest. | |
165 | */ | |
166 | static struct nfs_client *find_client_with_session( | |
167 | const struct sockaddr *addr, u32 nfsversion, | |
168 | struct nfs4_sessionid *sessionid) | |
169 | { | |
170 | struct nfs_client *clp; | |
171 | ||
172 | clp = nfs_find_client(addr, 4); | |
173 | if (clp == NULL) | |
174 | return NULL; | |
175 | ||
176 | do { | |
177 | struct nfs_client *prev = clp; | |
178 | ||
179 | if (clp->cl_session != NULL) { | |
180 | if (memcmp(clp->cl_session->sess_id.data, | |
181 | sessionid->data, | |
182 | NFS4_MAX_SESSIONID_LEN) == 0) { | |
183 | /* Returns a held reference to clp */ | |
184 | return clp; | |
185 | } | |
186 | } | |
187 | clp = nfs_find_client_next(prev); | |
188 | nfs_put_client(prev); | |
189 | } while (clp != NULL); | |
190 | ||
191 | return NULL; | |
192 | } | |
193 | ||
d49433e1 BH |
194 | /* FIXME: referring calls should be processed */ |
195 | unsigned nfs4_callback_sequence(struct cb_sequenceargs *args, | |
196 | struct cb_sequenceres *res) | |
197 | { | |
68f3f901 RL |
198 | struct nfs_client *clp; |
199 | int i, status; | |
d49433e1 BH |
200 | |
201 | for (i = 0; i < args->csa_nrclists; i++) | |
202 | kfree(args->csa_rclists[i].rcl_refcalls); | |
203 | kfree(args->csa_rclists); | |
204 | ||
68f3f901 RL |
205 | status = htonl(NFS4ERR_BADSESSION); |
206 | clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid); | |
207 | if (clp == NULL) | |
208 | goto out; | |
209 | ||
210 | status = validate_seqid(&clp->cl_session->bc_slot_table, | |
211 | args->csa_slotid, args->csa_sequenceid); | |
212 | if (status) | |
213 | goto out_putclient; | |
214 | ||
d49433e1 BH |
215 | memcpy(&res->csr_sessionid, &args->csa_sessionid, |
216 | sizeof(res->csr_sessionid)); | |
217 | res->csr_sequenceid = args->csa_sequenceid; | |
218 | res->csr_slotid = args->csa_slotid; | |
219 | res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
220 | res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
221 | ||
68f3f901 RL |
222 | out_putclient: |
223 | nfs_put_client(clp); | |
224 | out: | |
d49433e1 BH |
225 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
226 | res->csr_status = status; | |
68f3f901 | 227 | return res->csr_status; |
d49433e1 BH |
228 | } |
229 | ||
230 | #endif /* CONFIG_NFS_V4_1 */ |