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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> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
4ce79717 | 11 | #include "nfs4_fs.h" |
1da177e4 LT |
12 | #include "callback.h" |
13 | #include "delegation.h" | |
24c8dbbb | 14 | #include "internal.h" |
1da177e4 | 15 | |
1d98fe67 | 16 | #ifdef NFS_DEBUG |
1da177e4 | 17 | #define NFSDBG_FACILITY NFSDBG_CALLBACK |
1d98fe67 | 18 | #endif |
1da177e4 | 19 | |
e6f684f6 | 20 | __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res) |
1da177e4 | 21 | { |
adfa6f98 | 22 | struct nfs_client *clp; |
1da177e4 LT |
23 | struct nfs_delegation *delegation; |
24 | struct nfs_inode *nfsi; | |
25 | struct inode *inode; | |
1d98fe67 | 26 | |
1da177e4 LT |
27 | res->bitmap[0] = res->bitmap[1] = 0; |
28 | res->status = htonl(NFS4ERR_BADHANDLE); | |
ff052645 | 29 | clp = nfs_find_client(args->addr, 4); |
1da177e4 LT |
30 | if (clp == NULL) |
31 | goto out; | |
1d98fe67 CL |
32 | |
33 | dprintk("NFS: GETATTR callback request from %s\n", | |
34 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
35 | ||
1da177e4 LT |
36 | inode = nfs_delegation_find_inode(clp, &args->fh); |
37 | if (inode == NULL) | |
38 | goto out_putclient; | |
39 | nfsi = NFS_I(inode); | |
40 | down_read(&nfsi->rwsem); | |
41 | delegation = nfsi->delegation; | |
42 | if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) | |
43 | goto out_iput; | |
44 | res->size = i_size_read(inode); | |
beb2a5ec TM |
45 | res->change_attr = delegation->change_attr; |
46 | if (nfsi->npages != 0) | |
47 | res->change_attr++; | |
1da177e4 LT |
48 | res->ctime = inode->i_ctime; |
49 | res->mtime = inode->i_mtime; | |
50 | res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & | |
51 | args->bitmap[0]; | |
52 | res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & | |
53 | args->bitmap[1]; | |
54 | res->status = 0; | |
55 | out_iput: | |
56 | up_read(&nfsi->rwsem); | |
57 | iput(inode); | |
58 | out_putclient: | |
24c8dbbb | 59 | nfs_put_client(clp); |
1da177e4 | 60 | out: |
3110ff80 | 61 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
1da177e4 LT |
62 | return res->status; |
63 | } | |
64 | ||
e6f684f6 | 65 | __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy) |
1da177e4 | 66 | { |
adfa6f98 | 67 | struct nfs_client *clp; |
1da177e4 | 68 | struct inode *inode; |
e6f684f6 | 69 | __be32 res; |
1da177e4 LT |
70 | |
71 | res = htonl(NFS4ERR_BADHANDLE); | |
ff052645 | 72 | clp = nfs_find_client(args->addr, 4); |
1da177e4 LT |
73 | if (clp == NULL) |
74 | goto out; | |
1d98fe67 CL |
75 | |
76 | dprintk("NFS: RECALL callback request from %s\n", | |
77 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
78 | ||
3fbd67ad TM |
79 | do { |
80 | struct nfs_client *prev = clp; | |
81 | ||
82 | inode = nfs_delegation_find_inode(clp, &args->fh); | |
83 | if (inode != NULL) { | |
84 | /* Set up a helper thread to actually return the delegation */ | |
e047a10c | 85 | switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { |
3fbd67ad TM |
86 | case 0: |
87 | res = 0; | |
88 | break; | |
89 | case -ENOENT: | |
90 | if (res != 0) | |
91 | res = htonl(NFS4ERR_BAD_STATEID); | |
92 | break; | |
93 | default: | |
94 | res = htonl(NFS4ERR_RESOURCE); | |
95 | } | |
96 | iput(inode); | |
97 | } | |
98 | clp = nfs_find_client_next(prev); | |
99 | nfs_put_client(prev); | |
100 | } while (clp != NULL); | |
1da177e4 | 101 | out: |
3110ff80 | 102 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
1da177e4 LT |
103 | return res; |
104 | } | |
d49433e1 | 105 | |
2597641d AB |
106 | int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) |
107 | { | |
108 | if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data, | |
109 | sizeof(delegation->stateid.data)) != 0) | |
110 | return 0; | |
111 | return 1; | |
112 | } | |
113 | ||
d49433e1 BH |
114 | #if defined(CONFIG_NFS_V4_1) |
115 | ||
2597641d AB |
116 | int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) |
117 | { | |
118 | if (delegation == NULL) | |
119 | return 0; | |
120 | ||
121 | /* seqid is 4-bytes long */ | |
122 | if (((u32 *) &stateid->data)[0] != 0) | |
123 | return 0; | |
124 | if (memcmp(&delegation->stateid.data[4], &stateid->data[4], | |
125 | sizeof(stateid->data)-4)) | |
126 | return 0; | |
127 | ||
128 | return 1; | |
129 | } | |
130 | ||
68f3f901 RL |
131 | /* |
132 | * Validate the sequenceID sent by the server. | |
133 | * Return success if the sequenceID is one more than what we last saw on | |
134 | * this slot, accounting for wraparound. Increments the slot's sequence. | |
135 | * | |
4911096f AA |
136 | * We don't yet implement a duplicate request cache, instead we set the |
137 | * back channel ca_maxresponsesize_cached to zero. This is OK for now | |
68f3f901 RL |
138 | * since we only currently implement idempotent callbacks anyway. |
139 | * | |
140 | * We have a single slot backchannel at this time, so we don't bother | |
141 | * checking the used_slots bit array on the table. The lower layer guarantees | |
142 | * a single outstanding callback request at a time. | |
143 | */ | |
9733f0d9 | 144 | static __be32 |
b2f28bd7 | 145 | validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args) |
68f3f901 RL |
146 | { |
147 | struct nfs4_slot *slot; | |
148 | ||
149 | dprintk("%s enter. slotid %d seqid %d\n", | |
b2f28bd7 | 150 | __func__, args->csa_slotid, args->csa_sequenceid); |
68f3f901 | 151 | |
b2f28bd7 | 152 | if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS) |
68f3f901 RL |
153 | return htonl(NFS4ERR_BADSLOT); |
154 | ||
b2f28bd7 | 155 | slot = tbl->slots + args->csa_slotid; |
68f3f901 RL |
156 | dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr); |
157 | ||
158 | /* Normal */ | |
b2f28bd7 | 159 | if (likely(args->csa_sequenceid == slot->seq_nr + 1)) { |
68f3f901 RL |
160 | slot->seq_nr++; |
161 | return htonl(NFS4_OK); | |
162 | } | |
163 | ||
164 | /* Replay */ | |
b2f28bd7 | 165 | if (args->csa_sequenceid == slot->seq_nr) { |
4911096f | 166 | dprintk("%s seqid %d is a replay\n", |
b2f28bd7 | 167 | __func__, args->csa_sequenceid); |
4911096f AA |
168 | /* Signal process_op to set this error on next op */ |
169 | if (args->csa_cachethis == 0) | |
170 | return htonl(NFS4ERR_RETRY_UNCACHED_REP); | |
171 | ||
172 | /* The ca_maxresponsesize_cached is 0 with no DRC */ | |
173 | else if (args->csa_cachethis == 1) | |
174 | return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); | |
68f3f901 RL |
175 | } |
176 | ||
177 | /* Wraparound */ | |
b2f28bd7 | 178 | if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) { |
68f3f901 RL |
179 | slot->seq_nr = 1; |
180 | return htonl(NFS4_OK); | |
181 | } | |
182 | ||
183 | /* Misordered request */ | |
184 | return htonl(NFS4ERR_SEQ_MISORDERED); | |
185 | } | |
186 | ||
963891ac RL |
187 | /* |
188 | * Returns a pointer to a held 'struct nfs_client' that matches the server's | |
189 | * address, major version number, and session ID. It is the caller's | |
190 | * responsibility to release the returned reference. | |
191 | * | |
192 | * Returns NULL if there are no connections with sessions, or if no session | |
193 | * matches the one of interest. | |
194 | */ | |
195 | static struct nfs_client *find_client_with_session( | |
196 | const struct sockaddr *addr, u32 nfsversion, | |
197 | struct nfs4_sessionid *sessionid) | |
198 | { | |
199 | struct nfs_client *clp; | |
200 | ||
201 | clp = nfs_find_client(addr, 4); | |
202 | if (clp == NULL) | |
203 | return NULL; | |
204 | ||
205 | do { | |
206 | struct nfs_client *prev = clp; | |
207 | ||
208 | if (clp->cl_session != NULL) { | |
209 | if (memcmp(clp->cl_session->sess_id.data, | |
210 | sessionid->data, | |
211 | NFS4_MAX_SESSIONID_LEN) == 0) { | |
212 | /* Returns a held reference to clp */ | |
213 | return clp; | |
214 | } | |
215 | } | |
216 | clp = nfs_find_client_next(prev); | |
217 | nfs_put_client(prev); | |
218 | } while (clp != NULL); | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
a7989c3e MS |
223 | /* |
224 | * For each referring call triple, check the session's slot table for | |
225 | * a match. If the slot is in use and the sequence numbers match, the | |
226 | * client is still waiting for a response to the original request. | |
227 | */ | |
228 | static bool referring_call_exists(struct nfs_client *clp, | |
229 | uint32_t nrclists, | |
230 | struct referring_call_list *rclists) | |
231 | { | |
232 | bool status = 0; | |
233 | int i, j; | |
234 | struct nfs4_session *session; | |
235 | struct nfs4_slot_table *tbl; | |
236 | struct referring_call_list *rclist; | |
237 | struct referring_call *ref; | |
238 | ||
239 | /* | |
240 | * XXX When client trunking is implemented, this becomes | |
241 | * a session lookup from within the loop | |
242 | */ | |
243 | session = clp->cl_session; | |
244 | tbl = &session->fc_slot_table; | |
245 | ||
246 | for (i = 0; i < nrclists; i++) { | |
247 | rclist = &rclists[i]; | |
248 | if (memcmp(session->sess_id.data, | |
249 | rclist->rcl_sessionid.data, | |
250 | NFS4_MAX_SESSIONID_LEN) != 0) | |
251 | continue; | |
252 | ||
253 | for (j = 0; j < rclist->rcl_nrefcalls; j++) { | |
254 | ref = &rclist->rcl_refcalls[j]; | |
255 | ||
256 | dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u " | |
257 | "slotid %u\n", __func__, | |
258 | ((u32 *)&rclist->rcl_sessionid.data)[0], | |
259 | ((u32 *)&rclist->rcl_sessionid.data)[1], | |
260 | ((u32 *)&rclist->rcl_sessionid.data)[2], | |
261 | ((u32 *)&rclist->rcl_sessionid.data)[3], | |
262 | ref->rc_sequenceid, ref->rc_slotid); | |
263 | ||
264 | spin_lock(&tbl->slot_tbl_lock); | |
265 | status = (test_bit(ref->rc_slotid, tbl->used_slots) && | |
266 | tbl->slots[ref->rc_slotid].seq_nr == | |
267 | ref->rc_sequenceid); | |
268 | spin_unlock(&tbl->slot_tbl_lock); | |
269 | if (status) | |
270 | goto out; | |
271 | } | |
272 | } | |
273 | ||
274 | out: | |
275 | return status; | |
276 | } | |
277 | ||
9733f0d9 | 278 | __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, |
d49433e1 BH |
279 | struct cb_sequenceres *res) |
280 | { | |
68f3f901 | 281 | struct nfs_client *clp; |
9733f0d9 AA |
282 | int i; |
283 | __be32 status; | |
d49433e1 | 284 | |
68f3f901 RL |
285 | status = htonl(NFS4ERR_BADSESSION); |
286 | clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid); | |
287 | if (clp == NULL) | |
288 | goto out; | |
289 | ||
b2f28bd7 | 290 | status = validate_seqid(&clp->cl_session->bc_slot_table, args); |
68f3f901 RL |
291 | if (status) |
292 | goto out_putclient; | |
293 | ||
72ce2b3c MS |
294 | /* |
295 | * Check for pending referring calls. If a match is found, a | |
296 | * related callback was received before the response to the original | |
297 | * call. | |
298 | */ | |
299 | if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { | |
300 | status = htonl(NFS4ERR_DELAY); | |
301 | goto out_putclient; | |
302 | } | |
303 | ||
d49433e1 BH |
304 | memcpy(&res->csr_sessionid, &args->csa_sessionid, |
305 | sizeof(res->csr_sessionid)); | |
306 | res->csr_sequenceid = args->csa_sequenceid; | |
307 | res->csr_slotid = args->csa_slotid; | |
308 | res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
309 | res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; | |
310 | ||
68f3f901 RL |
311 | out_putclient: |
312 | nfs_put_client(clp); | |
313 | out: | |
72ce2b3c MS |
314 | for (i = 0; i < args->csa_nrclists; i++) |
315 | kfree(args->csa_rclists[i].rcl_refcalls); | |
316 | kfree(args->csa_rclists); | |
317 | ||
4911096f AA |
318 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) |
319 | res->csr_status = 0; | |
320 | else | |
321 | res->csr_status = status; | |
322 | dprintk("%s: exit with status = %d res->csr_status %d\n", __func__, | |
323 | ntohl(status), ntohl(res->csr_status)); | |
324 | return status; | |
d49433e1 BH |
325 | } |
326 | ||
9733f0d9 | 327 | __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy) |
31f09607 AB |
328 | { |
329 | struct nfs_client *clp; | |
9733f0d9 | 330 | __be32 status; |
31f09607 AB |
331 | fmode_t flags = 0; |
332 | ||
333 | status = htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
334 | clp = nfs_find_client(args->craa_addr, 4); | |
335 | if (clp == NULL) | |
336 | goto out; | |
337 | ||
338 | dprintk("NFS: RECALL_ANY callback request from %s\n", | |
339 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
340 | ||
341 | if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) | |
342 | &args->craa_type_mask)) | |
343 | flags = FMODE_READ; | |
344 | if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *) | |
345 | &args->craa_type_mask)) | |
346 | flags |= FMODE_WRITE; | |
347 | ||
348 | if (flags) | |
349 | nfs_expire_all_delegation_types(clp, flags); | |
350 | status = htonl(NFS4_OK); | |
351 | out: | |
352 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
353 | return status; | |
354 | } | |
b9efa1b2 AA |
355 | |
356 | /* Reduce the fore channel's max_slots to the target value */ | |
9733f0d9 | 357 | __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy) |
b9efa1b2 AA |
358 | { |
359 | struct nfs_client *clp; | |
360 | struct nfs4_slot_table *fc_tbl; | |
9733f0d9 | 361 | __be32 status; |
b9efa1b2 AA |
362 | |
363 | status = htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
364 | clp = nfs_find_client(args->crsa_addr, 4); | |
365 | if (clp == NULL) | |
366 | goto out; | |
367 | ||
368 | dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n", | |
369 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), | |
370 | args->crsa_target_max_slots); | |
371 | ||
372 | fc_tbl = &clp->cl_session->fc_slot_table; | |
373 | ||
374 | status = htonl(NFS4ERR_BAD_HIGH_SLOT); | |
bae0ac0e | 375 | if (args->crsa_target_max_slots > fc_tbl->max_slots || |
b9efa1b2 | 376 | args->crsa_target_max_slots < 1) |
bae0ac0e AA |
377 | goto out_putclient; |
378 | ||
379 | status = htonl(NFS4_OK); | |
380 | if (args->crsa_target_max_slots == fc_tbl->max_slots) | |
381 | goto out_putclient; | |
b9efa1b2 AA |
382 | |
383 | fc_tbl->target_max_slots = args->crsa_target_max_slots; | |
384 | nfs41_handle_recall_slot(clp); | |
bae0ac0e | 385 | out_putclient: |
b9efa1b2 AA |
386 | nfs_put_client(clp); /* balance nfs_find_client */ |
387 | out: | |
388 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
389 | return status; | |
390 | } | |
d49433e1 | 391 | #endif /* CONFIG_NFS_V4_1 */ |