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 | ||
2597641d AB |
64 | static int (*nfs_validate_delegation_stateid(struct nfs_client *clp))(struct nfs_delegation *, const nfs4_stateid *) |
65 | { | |
66 | #if defined(CONFIG_NFS_V4_1) | |
67 | if (clp->cl_minorversion > 0) | |
68 | return nfs41_validate_delegation_stateid; | |
69 | #endif | |
70 | return nfs4_validate_delegation_stateid; | |
71 | } | |
72 | ||
73 | ||
e6f684f6 | 74 | __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy) |
1da177e4 | 75 | { |
adfa6f98 | 76 | struct nfs_client *clp; |
1da177e4 | 77 | struct inode *inode; |
e6f684f6 | 78 | __be32 res; |
1da177e4 LT |
79 | |
80 | res = htonl(NFS4ERR_BADHANDLE); | |
ff052645 | 81 | clp = nfs_find_client(args->addr, 4); |
1da177e4 LT |
82 | if (clp == NULL) |
83 | goto out; | |
1d98fe67 CL |
84 | |
85 | dprintk("NFS: RECALL callback request from %s\n", | |
86 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
87 | ||
3fbd67ad TM |
88 | do { |
89 | struct nfs_client *prev = clp; | |
90 | ||
91 | inode = nfs_delegation_find_inode(clp, &args->fh); | |
92 | if (inode != NULL) { | |
93 | /* Set up a helper thread to actually return the delegation */ | |
2597641d AB |
94 | switch (nfs_async_inode_return_delegation(inode, &args->stateid, |
95 | nfs_validate_delegation_stateid(clp))) { | |
3fbd67ad TM |
96 | case 0: |
97 | res = 0; | |
98 | break; | |
99 | case -ENOENT: | |
100 | if (res != 0) | |
101 | res = htonl(NFS4ERR_BAD_STATEID); | |
102 | break; | |
103 | default: | |
104 | res = htonl(NFS4ERR_RESOURCE); | |
105 | } | |
106 | iput(inode); | |
107 | } | |
108 | clp = nfs_find_client_next(prev); | |
109 | nfs_put_client(prev); | |
110 | } while (clp != NULL); | |
1da177e4 | 111 | out: |
3110ff80 | 112 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
1da177e4 LT |
113 | return res; |
114 | } | |
d49433e1 | 115 | |
2597641d AB |
116 | int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) |
117 | { | |
118 | if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data, | |
119 | sizeof(delegation->stateid.data)) != 0) | |
120 | return 0; | |
121 | return 1; | |
122 | } | |
123 | ||
d49433e1 BH |
124 | #if defined(CONFIG_NFS_V4_1) |
125 | ||
2597641d AB |
126 | int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) |
127 | { | |
128 | if (delegation == NULL) | |
129 | return 0; | |
130 | ||
131 | /* seqid is 4-bytes long */ | |
132 | if (((u32 *) &stateid->data)[0] != 0) | |
133 | return 0; | |
134 | if (memcmp(&delegation->stateid.data[4], &stateid->data[4], | |
135 | sizeof(stateid->data)-4)) | |
136 | return 0; | |
137 | ||
138 | return 1; | |
139 | } | |
140 | ||
68f3f901 RL |
141 | /* |
142 | * Validate the sequenceID sent by the server. | |
143 | * Return success if the sequenceID is one more than what we last saw on | |
144 | * this slot, accounting for wraparound. Increments the slot's sequence. | |
145 | * | |
4911096f AA |
146 | * We don't yet implement a duplicate request cache, instead we set the |
147 | * back channel ca_maxresponsesize_cached to zero. This is OK for now | |
68f3f901 RL |
148 | * since we only currently implement idempotent callbacks anyway. |
149 | * | |
150 | * We have a single slot backchannel at this time, so we don't bother | |
151 | * checking the used_slots bit array on the table. The lower layer guarantees | |
152 | * a single outstanding callback request at a time. | |
153 | */ | |
154 | static int | |
b2f28bd7 | 155 | validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args) |
68f3f901 RL |
156 | { |
157 | struct nfs4_slot *slot; | |
158 | ||
159 | dprintk("%s enter. slotid %d seqid %d\n", | |
b2f28bd7 | 160 | __func__, args->csa_slotid, args->csa_sequenceid); |
68f3f901 | 161 | |
b2f28bd7 | 162 | if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS) |
68f3f901 RL |
163 | return htonl(NFS4ERR_BADSLOT); |
164 | ||
b2f28bd7 | 165 | slot = tbl->slots + args->csa_slotid; |
68f3f901 RL |
166 | dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr); |
167 | ||
168 | /* Normal */ | |
b2f28bd7 | 169 | if (likely(args->csa_sequenceid == slot->seq_nr + 1)) { |
68f3f901 RL |
170 | slot->seq_nr++; |
171 | return htonl(NFS4_OK); | |
172 | } | |
173 | ||
174 | /* Replay */ | |
b2f28bd7 | 175 | if (args->csa_sequenceid == slot->seq_nr) { |
4911096f | 176 | dprintk("%s seqid %d is a replay\n", |
b2f28bd7 | 177 | __func__, args->csa_sequenceid); |
4911096f AA |
178 | /* Signal process_op to set this error on next op */ |
179 | if (args->csa_cachethis == 0) | |
180 | return htonl(NFS4ERR_RETRY_UNCACHED_REP); | |
181 | ||
182 | /* The ca_maxresponsesize_cached is 0 with no DRC */ | |
183 | else if (args->csa_cachethis == 1) | |
184 | return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); | |
68f3f901 RL |
185 | } |
186 | ||
187 | /* Wraparound */ | |
b2f28bd7 | 188 | if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) { |
68f3f901 RL |
189 | slot->seq_nr = 1; |
190 | return htonl(NFS4_OK); | |
191 | } | |
192 | ||
193 | /* Misordered request */ | |
194 | return htonl(NFS4ERR_SEQ_MISORDERED); | |
195 | } | |
196 | ||
963891ac RL |
197 | /* |
198 | * Returns a pointer to a held 'struct nfs_client' that matches the server's | |
199 | * address, major version number, and session ID. It is the caller's | |
200 | * responsibility to release the returned reference. | |
201 | * | |
202 | * Returns NULL if there are no connections with sessions, or if no session | |
203 | * matches the one of interest. | |
204 | */ | |
205 | static struct nfs_client *find_client_with_session( | |
206 | const struct sockaddr *addr, u32 nfsversion, | |
207 | struct nfs4_sessionid *sessionid) | |
208 | { | |
209 | struct nfs_client *clp; | |
210 | ||
211 | clp = nfs_find_client(addr, 4); | |
212 | if (clp == NULL) | |
213 | return NULL; | |
214 | ||
215 | do { | |
216 | struct nfs_client *prev = clp; | |
217 | ||
218 | if (clp->cl_session != NULL) { | |
219 | if (memcmp(clp->cl_session->sess_id.data, | |
220 | sessionid->data, | |
221 | NFS4_MAX_SESSIONID_LEN) == 0) { | |
222 | /* Returns a held reference to clp */ | |
223 | return clp; | |
224 | } | |
225 | } | |
226 | clp = nfs_find_client_next(prev); | |
227 | nfs_put_client(prev); | |
228 | } while (clp != NULL); | |
229 | ||
230 | return NULL; | |
231 | } | |
232 | ||
a7989c3e MS |
233 | /* |
234 | * For each referring call triple, check the session's slot table for | |
235 | * a match. If the slot is in use and the sequence numbers match, the | |
236 | * client is still waiting for a response to the original request. | |
237 | */ | |
238 | static bool referring_call_exists(struct nfs_client *clp, | |
239 | uint32_t nrclists, | |
240 | struct referring_call_list *rclists) | |
241 | { | |
242 | bool status = 0; | |
243 | int i, j; | |
244 | struct nfs4_session *session; | |
245 | struct nfs4_slot_table *tbl; | |
246 | struct referring_call_list *rclist; | |
247 | struct referring_call *ref; | |
248 | ||
249 | /* | |
250 | * XXX When client trunking is implemented, this becomes | |
251 | * a session lookup from within the loop | |
252 | */ | |
253 | session = clp->cl_session; | |
254 | tbl = &session->fc_slot_table; | |
255 | ||
256 | for (i = 0; i < nrclists; i++) { | |
257 | rclist = &rclists[i]; | |
258 | if (memcmp(session->sess_id.data, | |
259 | rclist->rcl_sessionid.data, | |
260 | NFS4_MAX_SESSIONID_LEN) != 0) | |
261 | continue; | |
262 | ||
263 | for (j = 0; j < rclist->rcl_nrefcalls; j++) { | |
264 | ref = &rclist->rcl_refcalls[j]; | |
265 | ||
266 | dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u " | |
267 | "slotid %u\n", __func__, | |
268 | ((u32 *)&rclist->rcl_sessionid.data)[0], | |
269 | ((u32 *)&rclist->rcl_sessionid.data)[1], | |
270 | ((u32 *)&rclist->rcl_sessionid.data)[2], | |
271 | ((u32 *)&rclist->rcl_sessionid.data)[3], | |
272 | ref->rc_sequenceid, ref->rc_slotid); | |
273 | ||
274 | spin_lock(&tbl->slot_tbl_lock); | |
275 | status = (test_bit(ref->rc_slotid, tbl->used_slots) && | |
276 | tbl->slots[ref->rc_slotid].seq_nr == | |
277 | ref->rc_sequenceid); | |
278 | spin_unlock(&tbl->slot_tbl_lock); | |
279 | if (status) | |
280 | goto out; | |
281 | } | |
282 | } | |
283 | ||
284 | out: | |
285 | return status; | |
286 | } | |
287 | ||
d49433e1 BH |
288 | unsigned nfs4_callback_sequence(struct cb_sequenceargs *args, |
289 | struct cb_sequenceres *res) | |
290 | { | |
68f3f901 RL |
291 | struct nfs_client *clp; |
292 | int i, status; | |
d49433e1 | 293 | |
68f3f901 RL |
294 | status = htonl(NFS4ERR_BADSESSION); |
295 | clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid); | |
296 | if (clp == NULL) | |
297 | goto out; | |
298 | ||
b2f28bd7 | 299 | status = validate_seqid(&clp->cl_session->bc_slot_table, args); |
68f3f901 RL |
300 | if (status) |
301 | goto out_putclient; | |
302 | ||
72ce2b3c MS |
303 | /* |
304 | * Check for pending referring calls. If a match is found, a | |
305 | * related callback was received before the response to the original | |
306 | * call. | |
307 | */ | |
308 | if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { | |
309 | status = htonl(NFS4ERR_DELAY); | |
310 | goto out_putclient; | |
311 | } | |
312 | ||
d49433e1 BH |
313 | memcpy(&res->csr_sessionid, &args->csa_sessionid, |
314 | sizeof(res->csr_sessionid)); | |
315 | res->csr_sequenceid = args->csa_sequenceid; | |
316 | res->csr_slotid = args->csa_slotid; | |
317 | res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
318 | res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
319 | ||
68f3f901 RL |
320 | out_putclient: |
321 | nfs_put_client(clp); | |
322 | out: | |
72ce2b3c MS |
323 | for (i = 0; i < args->csa_nrclists; i++) |
324 | kfree(args->csa_rclists[i].rcl_refcalls); | |
325 | kfree(args->csa_rclists); | |
326 | ||
4911096f AA |
327 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) |
328 | res->csr_status = 0; | |
329 | else | |
330 | res->csr_status = status; | |
331 | dprintk("%s: exit with status = %d res->csr_status %d\n", __func__, | |
332 | ntohl(status), ntohl(res->csr_status)); | |
333 | return status; | |
d49433e1 BH |
334 | } |
335 | ||
31f09607 AB |
336 | unsigned nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy) |
337 | { | |
338 | struct nfs_client *clp; | |
339 | int status; | |
340 | fmode_t flags = 0; | |
341 | ||
342 | status = htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
343 | clp = nfs_find_client(args->craa_addr, 4); | |
344 | if (clp == NULL) | |
345 | goto out; | |
346 | ||
347 | dprintk("NFS: RECALL_ANY callback request from %s\n", | |
348 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
349 | ||
350 | if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) | |
351 | &args->craa_type_mask)) | |
352 | flags = FMODE_READ; | |
353 | if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *) | |
354 | &args->craa_type_mask)) | |
355 | flags |= FMODE_WRITE; | |
356 | ||
357 | if (flags) | |
358 | nfs_expire_all_delegation_types(clp, flags); | |
359 | status = htonl(NFS4_OK); | |
360 | out: | |
361 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
362 | return status; | |
363 | } | |
d49433e1 | 364 | #endif /* CONFIG_NFS_V4_1 */ |