Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/callback_proc.c | |
4 | * | |
5 | * Copyright (C) 2004 Trond Myklebust | |
6 | * | |
7 | * NFSv4 callback procedures | |
8 | */ | |
1da177e4 LT |
9 | #include <linux/nfs4.h> |
10 | #include <linux/nfs_fs.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
2446ab60 | 12 | #include <linux/rcupdate.h> |
4ce79717 | 13 | #include "nfs4_fs.h" |
1da177e4 LT |
14 | #include "callback.h" |
15 | #include "delegation.h" | |
24c8dbbb | 16 | #include "internal.h" |
43f1b3da | 17 | #include "pnfs.h" |
73e39aaa | 18 | #include "nfs4session.h" |
ca8acf8d | 19 | #include "nfs4trace.h" |
1da177e4 LT |
20 | |
21 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
c36fca52 | 22 | |
f4dac4ad | 23 | __be32 nfs4_callback_getattr(void *argp, void *resp, |
c36fca52 | 24 | struct cb_process_state *cps) |
1da177e4 | 25 | { |
f4dac4ad CH |
26 | struct cb_getattrargs *args = argp; |
27 | struct cb_getattrres *res = resp; | |
1da177e4 LT |
28 | struct nfs_delegation *delegation; |
29 | struct nfs_inode *nfsi; | |
30 | struct inode *inode; | |
1d98fe67 | 31 | |
c36fca52 AA |
32 | res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
33 | if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ | |
34 | goto out; | |
35 | ||
1da177e4 LT |
36 | res->bitmap[0] = res->bitmap[1] = 0; |
37 | res->status = htonl(NFS4ERR_BADHANDLE); | |
1d98fe67 | 38 | |
2446ab60 | 39 | dprintk_rcu("NFS: GETATTR callback request from %s\n", |
c36fca52 | 40 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
1d98fe67 | 41 | |
c36fca52 | 42 | inode = nfs_delegation_find_inode(cps->clp, &args->fh); |
7cd14861 | 43 | if (inode == NULL) { |
249b2eef | 44 | trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, |
7cd14861 | 45 | -ntohl(res->status)); |
c36fca52 | 46 | goto out; |
7cd14861 | 47 | } |
1da177e4 | 48 | nfsi = NFS_I(inode); |
761fe93c TM |
49 | rcu_read_lock(); |
50 | delegation = rcu_dereference(nfsi->delegation); | |
1da177e4 LT |
51 | if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) |
52 | goto out_iput; | |
53 | res->size = i_size_read(inode); | |
beb2a5ec | 54 | res->change_attr = delegation->change_attr; |
a6b6d5b8 | 55 | if (nfs_have_writebacks(inode)) |
beb2a5ec | 56 | res->change_attr++; |
1da177e4 LT |
57 | res->ctime = inode->i_ctime; |
58 | res->mtime = inode->i_mtime; | |
59 | res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & | |
60 | args->bitmap[0]; | |
61 | res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & | |
62 | args->bitmap[1]; | |
63 | res->status = 0; | |
64 | out_iput: | |
761fe93c | 65 | rcu_read_unlock(); |
7cd14861 | 66 | trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); |
1da177e4 | 67 | iput(inode); |
1da177e4 | 68 | out: |
3110ff80 | 69 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
1da177e4 LT |
70 | return res->status; |
71 | } | |
72 | ||
f4dac4ad | 73 | __be32 nfs4_callback_recall(void *argp, void *resp, |
c36fca52 | 74 | struct cb_process_state *cps) |
1da177e4 | 75 | { |
f4dac4ad | 76 | struct cb_recallargs *args = argp; |
1da177e4 | 77 | struct inode *inode; |
e6f684f6 | 78 | __be32 res; |
1da177e4 | 79 | |
c36fca52 AA |
80 | res = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
81 | if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ | |
1da177e4 | 82 | goto out; |
1d98fe67 | 83 | |
2446ab60 | 84 | dprintk_rcu("NFS: RECALL callback request from %s\n", |
c36fca52 AA |
85 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
86 | ||
87 | res = htonl(NFS4ERR_BADHANDLE); | |
88 | inode = nfs_delegation_find_inode(cps->clp, &args->fh); | |
e07db907 TM |
89 | if (inode == NULL) { |
90 | trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, | |
91 | &args->stateid, -ntohl(res)); | |
c36fca52 | 92 | goto out; |
e07db907 | 93 | } |
c36fca52 AA |
94 | /* Set up a helper thread to actually return the delegation */ |
95 | switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { | |
96 | case 0: | |
97 | res = 0; | |
98 | break; | |
99 | case -ENOENT: | |
8e663f0e | 100 | res = htonl(NFS4ERR_BAD_STATEID); |
c36fca52 AA |
101 | break; |
102 | default: | |
103 | res = htonl(NFS4ERR_RESOURCE); | |
104 | } | |
e07db907 TM |
105 | trace_nfs4_cb_recall(cps->clp, &args->fh, inode, |
106 | &args->stateid, -ntohl(res)); | |
c36fca52 | 107 | iput(inode); |
1da177e4 | 108 | out: |
3110ff80 | 109 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
1da177e4 LT |
110 | return res; |
111 | } | |
d49433e1 BH |
112 | |
113 | #if defined(CONFIG_NFS_V4_1) | |
114 | ||
d36b7cf7 | 115 | /* |
7b410d9c | 116 | * Lookup a layout inode by stateid |
d36b7cf7 | 117 | * |
7b410d9c TM |
118 | * Note: returns a refcount on the inode and superblock |
119 | */ | |
120 | static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, | |
121 | const nfs4_stateid *stateid) | |
122 | { | |
123 | struct nfs_server *server; | |
124 | struct inode *inode; | |
125 | struct pnfs_layout_hdr *lo; | |
126 | ||
127 | restart: | |
128 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
129 | list_for_each_entry(lo, &server->layouts, plh_layouts) { | |
130 | if (stateid != NULL && | |
131 | !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) | |
132 | continue; | |
133 | inode = igrab(lo->plh_inode); | |
134 | if (!inode) | |
135 | continue; | |
136 | if (!nfs_sb_active(inode->i_sb)) { | |
2e84611b | 137 | rcu_read_unlock(); |
7b410d9c TM |
138 | spin_unlock(&clp->cl_lock); |
139 | iput(inode); | |
140 | spin_lock(&clp->cl_lock); | |
2e84611b | 141 | rcu_read_lock(); |
7b410d9c TM |
142 | goto restart; |
143 | } | |
144 | return inode; | |
145 | } | |
146 | } | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Lookup a layout inode by filehandle. | |
153 | * | |
154 | * Note: returns a refcount on the inode and superblock | |
d36b7cf7 | 155 | * |
d36b7cf7 | 156 | */ |
7b410d9c TM |
157 | static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, |
158 | const struct nfs_fh *fh) | |
43f1b3da | 159 | { |
6382a441 | 160 | struct nfs_server *server; |
793b7fe5 | 161 | struct nfs_inode *nfsi; |
7b410d9c | 162 | struct inode *inode; |
d36b7cf7 | 163 | struct pnfs_layout_hdr *lo; |
43f1b3da | 164 | |
793b7fe5 | 165 | restart: |
6382a441 WAA |
166 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
167 | list_for_each_entry(lo, &server->layouts, plh_layouts) { | |
793b7fe5 TM |
168 | nfsi = NFS_I(lo->plh_inode); |
169 | if (nfs_compare_fh(fh, &nfsi->fh)) | |
27999f25 | 170 | continue; |
793b7fe5 | 171 | if (nfsi->layout != lo) |
6382a441 | 172 | continue; |
7b410d9c TM |
173 | inode = igrab(lo->plh_inode); |
174 | if (!inode) | |
175 | continue; | |
176 | if (!nfs_sb_active(inode->i_sb)) { | |
2e84611b | 177 | rcu_read_unlock(); |
7b410d9c TM |
178 | spin_unlock(&clp->cl_lock); |
179 | iput(inode); | |
180 | spin_lock(&clp->cl_lock); | |
2e84611b | 181 | rcu_read_lock(); |
793b7fe5 | 182 | goto restart; |
9c626381 | 183 | } |
7b410d9c | 184 | return inode; |
6382a441 | 185 | } |
43f1b3da | 186 | } |
d36b7cf7 BH |
187 | |
188 | return NULL; | |
189 | } | |
190 | ||
7b410d9c TM |
191 | static struct inode *nfs_layout_find_inode(struct nfs_client *clp, |
192 | const struct nfs_fh *fh, | |
193 | const nfs4_stateid *stateid) | |
d36b7cf7 | 194 | { |
7b410d9c | 195 | struct inode *inode; |
d36b7cf7 BH |
196 | |
197 | spin_lock(&clp->cl_lock); | |
198 | rcu_read_lock(); | |
7b410d9c TM |
199 | inode = nfs_layout_find_inode_by_stateid(clp, stateid); |
200 | if (!inode) | |
201 | inode = nfs_layout_find_inode_by_fh(clp, fh); | |
6382a441 | 202 | rcu_read_unlock(); |
43f1b3da | 203 | spin_unlock(&clp->cl_lock); |
6382a441 | 204 | |
7b410d9c | 205 | return inode; |
d36b7cf7 BH |
206 | } |
207 | ||
41c9127d TM |
208 | /* |
209 | * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) | |
210 | */ | |
793b7fe5 | 211 | static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, |
41c9127d TM |
212 | const nfs4_stateid *new) |
213 | { | |
214 | u32 oldseq, newseq; | |
215 | ||
793b7fe5 TM |
216 | /* Is the stateid still not initialised? */ |
217 | if (!pnfs_layout_is_valid(lo)) | |
218 | return NFS4ERR_DELAY; | |
219 | ||
220 | /* Mismatched stateid? */ | |
221 | if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) | |
222 | return NFS4ERR_BAD_STATEID; | |
223 | ||
41c9127d | 224 | newseq = be32_to_cpu(new->seqid); |
793b7fe5 TM |
225 | /* Are we already in a layout recall situation? */ |
226 | if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && | |
227 | lo->plh_return_seq != 0) { | |
228 | if (newseq < lo->plh_return_seq) | |
229 | return NFS4ERR_OLD_STATEID; | |
230 | if (newseq > lo->plh_return_seq) | |
231 | return NFS4ERR_DELAY; | |
232 | goto out; | |
233 | } | |
41c9127d | 234 | |
793b7fe5 TM |
235 | /* Check that the stateid matches what we think it should be. */ |
236 | oldseq = be32_to_cpu(lo->plh_stateid.seqid); | |
41c9127d | 237 | if (newseq > oldseq + 1) |
793b7fe5 TM |
238 | return NFS4ERR_DELAY; |
239 | /* Crazy server! */ | |
240 | if (newseq <= oldseq) | |
241 | return NFS4ERR_OLD_STATEID; | |
242 | out: | |
243 | return NFS_OK; | |
41c9127d TM |
244 | } |
245 | ||
d36b7cf7 BH |
246 | static u32 initiate_file_draining(struct nfs_client *clp, |
247 | struct cb_layoutrecallargs *args) | |
248 | { | |
249 | struct inode *ino; | |
250 | struct pnfs_layout_hdr *lo; | |
251 | u32 rv = NFS4ERR_NOMATCHING_LAYOUT; | |
252 | LIST_HEAD(free_me_list); | |
253 | ||
7b410d9c TM |
254 | ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); |
255 | if (!ino) | |
27999f25 | 256 | goto out; |
43f1b3da | 257 | |
793b7fe5 TM |
258 | pnfs_layoutcommit_inode(ino, false); |
259 | ||
7c5d1875 CH |
260 | |
261 | spin_lock(&ino->i_lock); | |
7b410d9c TM |
262 | lo = NFS_I(ino)->layout; |
263 | if (!lo) { | |
264 | spin_unlock(&ino->i_lock); | |
265 | goto out; | |
266 | } | |
267 | pnfs_get_layout_hdr(lo); | |
793b7fe5 TM |
268 | rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); |
269 | if (rv != NFS_OK) | |
41c9127d | 270 | goto unlock; |
7c5d1875 | 271 | pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); |
7c5d1875 | 272 | |
fc7ff367 TM |
273 | /* |
274 | * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) | |
275 | */ | |
276 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { | |
277 | rv = NFS4ERR_DELAY; | |
278 | goto unlock; | |
279 | } | |
280 | ||
4b0934ba | 281 | if (pnfs_mark_matching_lsegs_return(lo, &free_me_list, |
6d597e17 JL |
282 | &args->cbl_range, |
283 | be32_to_cpu(args->cbl_stateid.seqid))) { | |
e0d92430 | 284 | rv = NFS4_OK; |
c88953d8 CH |
285 | goto unlock; |
286 | } | |
287 | ||
793b7fe5 TM |
288 | /* Embrace your forgetfulness! */ |
289 | rv = NFS4ERR_NOMATCHING_LAYOUT; | |
290 | ||
c88953d8 CH |
291 | if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { |
292 | NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, | |
293 | &args->cbl_range); | |
294 | } | |
295 | unlock: | |
43f1b3da FI |
296 | spin_unlock(&ino->i_lock); |
297 | pnfs_free_lseg_list(&free_me_list); | |
b20135d0 TM |
298 | /* Free all lsegs that are attached to commit buckets */ |
299 | nfs_commit_inode(ino, 0); | |
70c3bd2b | 300 | pnfs_put_layout_hdr(lo); |
7b410d9c | 301 | out: |
e07db907 TM |
302 | trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, |
303 | &args->cbl_stateid, -rv); | |
7b410d9c | 304 | nfs_iput_and_deactive(ino); |
43f1b3da FI |
305 | return rv; |
306 | } | |
307 | ||
308 | static u32 initiate_bulk_draining(struct nfs_client *clp, | |
309 | struct cb_layoutrecallargs *args) | |
310 | { | |
fd9a8d71 | 311 | int stat; |
6382a441 | 312 | |
fd9a8d71 TM |
313 | if (args->cbl_recall_type == RETURN_FSID) |
314 | stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); | |
315 | else | |
316 | stat = pnfs_destroy_layouts_byclid(clp, true); | |
317 | if (stat != 0) | |
318 | return NFS4ERR_DELAY; | |
319 | return NFS4ERR_NOMATCHING_LAYOUT; | |
43f1b3da FI |
320 | } |
321 | ||
322 | static u32 do_callback_layoutrecall(struct nfs_client *clp, | |
323 | struct cb_layoutrecallargs *args) | |
324 | { | |
43f1b3da | 325 | if (args->cbl_recall_type == RETURN_FILE) |
1a916ce0 AS |
326 | return initiate_file_draining(clp, args); |
327 | return initiate_bulk_draining(clp, args); | |
43f1b3da FI |
328 | } |
329 | ||
f4dac4ad CH |
330 | __be32 nfs4_callback_layoutrecall(void *argp, void *resp, |
331 | struct cb_process_state *cps) | |
f2a62561 | 332 | { |
f4dac4ad | 333 | struct cb_layoutrecallargs *args = argp; |
5694a4f8 | 334 | u32 res = NFS4ERR_OP_NOT_IN_SESSION; |
43f1b3da FI |
335 | |
336 | if (cps->clp) | |
337 | res = do_callback_layoutrecall(cps->clp, args); | |
43f1b3da | 338 | return cpu_to_be32(res); |
f2a62561 FI |
339 | } |
340 | ||
36840370 AB |
341 | static void pnfs_recall_all_layouts(struct nfs_client *clp) |
342 | { | |
343 | struct cb_layoutrecallargs args; | |
344 | ||
345 | /* Pretend we got a CB_LAYOUTRECALL(ALL) */ | |
346 | memset(&args, 0, sizeof(args)); | |
347 | args.cbl_recall_type = RETURN_ALL; | |
348 | /* FIXME we ignore errors, what should we do? */ | |
349 | do_callback_layoutrecall(clp, &args); | |
350 | } | |
351 | ||
f4dac4ad CH |
352 | __be32 nfs4_callback_devicenotify(void *argp, void *resp, |
353 | struct cb_process_state *cps) | |
1be5683b | 354 | { |
f4dac4ad | 355 | struct cb_devicenotifyargs *args = argp; |
1be5683b ME |
356 | int i; |
357 | __be32 res = 0; | |
358 | struct nfs_client *clp = cps->clp; | |
359 | struct nfs_server *server = NULL; | |
360 | ||
1be5683b ME |
361 | if (!clp) { |
362 | res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); | |
363 | goto out; | |
364 | } | |
365 | ||
366 | for (i = 0; i < args->ndevs; i++) { | |
367 | struct cb_devicenotifyitem *dev = &args->devs[i]; | |
368 | ||
369 | if (!server || | |
370 | server->pnfs_curr_ld->id != dev->cbd_layout_type) { | |
371 | rcu_read_lock(); | |
372 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
373 | if (server->pnfs_curr_ld && | |
374 | server->pnfs_curr_ld->id == dev->cbd_layout_type) { | |
375 | rcu_read_unlock(); | |
376 | goto found; | |
377 | } | |
378 | rcu_read_unlock(); | |
1be5683b ME |
379 | continue; |
380 | } | |
381 | ||
382 | found: | |
35c8bb54 | 383 | nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); |
1be5683b ME |
384 | } |
385 | ||
386 | out: | |
387 | kfree(args->devs); | |
1be5683b ME |
388 | return res; |
389 | } | |
390 | ||
68f3f901 RL |
391 | /* |
392 | * Validate the sequenceID sent by the server. | |
393 | * Return success if the sequenceID is one more than what we last saw on | |
394 | * this slot, accounting for wraparound. Increments the slot's sequence. | |
395 | * | |
4911096f AA |
396 | * We don't yet implement a duplicate request cache, instead we set the |
397 | * back channel ca_maxresponsesize_cached to zero. This is OK for now | |
68f3f901 RL |
398 | * since we only currently implement idempotent callbacks anyway. |
399 | * | |
400 | * We have a single slot backchannel at this time, so we don't bother | |
401 | * checking the used_slots bit array on the table. The lower layer guarantees | |
402 | * a single outstanding callback request at a time. | |
403 | */ | |
9733f0d9 | 404 | static __be32 |
5f83d86c TM |
405 | validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, |
406 | const struct cb_sequenceargs * args) | |
68f3f901 | 407 | { |
f4f58ed1 | 408 | if (args->csa_slotid > tbl->server_highest_slotid) |
68f3f901 RL |
409 | return htonl(NFS4ERR_BADSLOT); |
410 | ||
68f3f901 | 411 | /* Replay */ |
b2f28bd7 | 412 | if (args->csa_sequenceid == slot->seq_nr) { |
810d82e6 | 413 | if (nfs4_test_locked_slot(tbl, slot->slot_nr)) |
f74a834a | 414 | return htonl(NFS4ERR_DELAY); |
4911096f AA |
415 | /* Signal process_op to set this error on next op */ |
416 | if (args->csa_cachethis == 0) | |
417 | return htonl(NFS4ERR_RETRY_UNCACHED_REP); | |
418 | ||
80f96427 TM |
419 | /* Liar! We never allowed you to set csa_cachethis != 0 */ |
420 | return htonl(NFS4ERR_SEQ_FALSE_RETRY); | |
68f3f901 RL |
421 | } |
422 | ||
423 | /* Wraparound */ | |
5f83d86c TM |
424 | if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) { |
425 | if (args->csa_sequenceid == 1) | |
426 | return htonl(NFS4_OK); | |
427 | } else if (likely(args->csa_sequenceid == slot->seq_nr + 1)) | |
428 | return htonl(NFS4_OK); | |
68f3f901 RL |
429 | |
430 | /* Misordered request */ | |
431 | return htonl(NFS4ERR_SEQ_MISORDERED); | |
432 | } | |
433 | ||
a7989c3e MS |
434 | /* |
435 | * For each referring call triple, check the session's slot table for | |
436 | * a match. If the slot is in use and the sequence numbers match, the | |
437 | * client is still waiting for a response to the original request. | |
438 | */ | |
439 | static bool referring_call_exists(struct nfs_client *clp, | |
440 | uint32_t nrclists, | |
441 | struct referring_call_list *rclists) | |
442 | { | |
6089dd0d | 443 | bool status = false; |
a7989c3e MS |
444 | int i, j; |
445 | struct nfs4_session *session; | |
446 | struct nfs4_slot_table *tbl; | |
447 | struct referring_call_list *rclist; | |
448 | struct referring_call *ref; | |
449 | ||
450 | /* | |
451 | * XXX When client trunking is implemented, this becomes | |
452 | * a session lookup from within the loop | |
453 | */ | |
454 | session = clp->cl_session; | |
455 | tbl = &session->fc_slot_table; | |
456 | ||
457 | for (i = 0; i < nrclists; i++) { | |
458 | rclist = &rclists[i]; | |
459 | if (memcmp(session->sess_id.data, | |
460 | rclist->rcl_sessionid.data, | |
461 | NFS4_MAX_SESSIONID_LEN) != 0) | |
462 | continue; | |
463 | ||
464 | for (j = 0; j < rclist->rcl_nrefcalls; j++) { | |
465 | ref = &rclist->rcl_refcalls[j]; | |
045d2a6d TM |
466 | status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, |
467 | ref->rc_sequenceid, HZ >> 1) < 0; | |
a7989c3e MS |
468 | if (status) |
469 | goto out; | |
470 | } | |
471 | } | |
472 | ||
473 | out: | |
474 | return status; | |
475 | } | |
476 | ||
f4dac4ad | 477 | __be32 nfs4_callback_sequence(void *argp, void *resp, |
c36fca52 | 478 | struct cb_process_state *cps) |
d49433e1 | 479 | { |
f4dac4ad CH |
480 | struct cb_sequenceargs *args = argp; |
481 | struct cb_sequenceres *res = resp; | |
55a67399 | 482 | struct nfs4_slot_table *tbl; |
e937ee71 | 483 | struct nfs4_slot *slot; |
68f3f901 | 484 | struct nfs_client *clp; |
9733f0d9 | 485 | int i; |
778be232 | 486 | __be32 status = htonl(NFS4ERR_BADSESSION); |
d49433e1 | 487 | |
459de2ed BS |
488 | clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, |
489 | &args->csa_sessionid, cps->minorversion); | |
68f3f901 RL |
490 | if (clp == NULL) |
491 | goto out; | |
492 | ||
b1c0df5f TM |
493 | if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) |
494 | goto out; | |
e937ee71 | 495 | |
55a67399 TM |
496 | tbl = &clp->cl_session->bc_slot_table; |
497 | ||
e5003b2f TM |
498 | /* Set up res before grabbing the spinlock */ |
499 | memcpy(&res->csr_sessionid, &args->csa_sessionid, | |
500 | sizeof(res->csr_sessionid)); | |
501 | res->csr_sequenceid = args->csa_sequenceid; | |
502 | res->csr_slotid = args->csa_slotid; | |
503 | ||
55a67399 | 504 | spin_lock(&tbl->slot_tbl_lock); |
42acd021 | 505 | /* state manager is resetting the session */ |
774d5f14 | 506 | if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
55a67399 | 507 | status = htonl(NFS4ERR_DELAY); |
910ac68a TM |
508 | /* Return NFS4ERR_BADSESSION if we're draining the session |
509 | * in order to reset it. | |
510 | */ | |
511 | if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) | |
512 | status = htonl(NFS4ERR_BADSESSION); | |
4e54ab8d | 513 | goto out_unlock; |
42acd021 AA |
514 | } |
515 | ||
810d82e6 TM |
516 | status = htonl(NFS4ERR_BADSLOT); |
517 | slot = nfs4_lookup_slot(tbl, args->csa_slotid); | |
518 | if (IS_ERR(slot)) | |
519 | goto out_unlock; | |
e5003b2f TM |
520 | |
521 | res->csr_highestslotid = tbl->server_highest_slotid; | |
522 | res->csr_target_highestslotid = tbl->target_highest_slotid; | |
523 | ||
5f83d86c TM |
524 | status = validate_seqid(tbl, slot, args); |
525 | if (status) | |
526 | goto out_unlock; | |
810d82e6 TM |
527 | if (!nfs4_try_to_lock_slot(tbl, slot)) { |
528 | status = htonl(NFS4ERR_DELAY); | |
529 | goto out_unlock; | |
530 | } | |
531 | cps->slot = slot; | |
5f83d86c | 532 | |
80f96427 | 533 | /* The ca_maxresponsesize_cached is 0 with no DRC */ |
c2985d00 OK |
534 | if (args->csa_cachethis != 0) { |
535 | status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); | |
536 | goto out_unlock; | |
537 | } | |
80f96427 | 538 | |
72ce2b3c MS |
539 | /* |
540 | * Check for pending referring calls. If a match is found, a | |
541 | * related callback was received before the response to the original | |
542 | * call. | |
543 | */ | |
544 | if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { | |
545 | status = htonl(NFS4ERR_DELAY); | |
4e54ab8d | 546 | goto out_unlock; |
72ce2b3c MS |
547 | } |
548 | ||
e937ee71 KM |
549 | /* |
550 | * RFC5661 20.9.3 | |
551 | * If CB_SEQUENCE returns an error, then the state of the slot | |
552 | * (sequence ID, cached reply) MUST NOT change. | |
553 | */ | |
5f83d86c | 554 | slot->seq_nr = args->csa_sequenceid; |
4e54ab8d TM |
555 | out_unlock: |
556 | spin_unlock(&tbl->slot_tbl_lock); | |
e937ee71 | 557 | |
68f3f901 | 558 | out: |
2c4cdf8f | 559 | cps->clp = clp; /* put in nfs4_callback_compound */ |
72ce2b3c MS |
560 | for (i = 0; i < args->csa_nrclists; i++) |
561 | kfree(args->csa_rclists[i].rcl_refcalls); | |
562 | kfree(args->csa_rclists); | |
563 | ||
c36fca52 AA |
564 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { |
565 | cps->drc_status = status; | |
566 | status = 0; | |
567 | } else | |
4911096f | 568 | res->csr_status = status; |
c36fca52 | 569 | |
2f92ae34 | 570 | trace_nfs4_cb_sequence(args, res, status); |
4911096f | 571 | return status; |
d49433e1 BH |
572 | } |
573 | ||
36840370 AB |
574 | static bool |
575 | validate_bitmap_values(unsigned long mask) | |
576 | { | |
577 | return (mask & ~RCA4_TYPE_MASK_ALL) == 0; | |
578 | } | |
579 | ||
f4dac4ad | 580 | __be32 nfs4_callback_recallany(void *argp, void *resp, |
c36fca52 | 581 | struct cb_process_state *cps) |
31f09607 | 582 | { |
f4dac4ad | 583 | struct cb_recallanyargs *args = argp; |
9733f0d9 | 584 | __be32 status; |
31f09607 AB |
585 | fmode_t flags = 0; |
586 | ||
36840370 | 587 | status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); |
c36fca52 | 588 | if (!cps->clp) /* set in cb_sequence */ |
31f09607 AB |
589 | goto out; |
590 | ||
2446ab60 | 591 | dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", |
c36fca52 | 592 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
31f09607 | 593 | |
36840370 AB |
594 | status = cpu_to_be32(NFS4ERR_INVAL); |
595 | if (!validate_bitmap_values(args->craa_type_mask)) | |
596 | goto out; | |
597 | ||
598 | status = cpu_to_be32(NFS4_OK); | |
31f09607 AB |
599 | if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) |
600 | &args->craa_type_mask)) | |
601 | flags = FMODE_READ; | |
602 | if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *) | |
603 | &args->craa_type_mask)) | |
604 | flags |= FMODE_WRITE; | |
36840370 AB |
605 | if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *) |
606 | &args->craa_type_mask)) | |
607 | pnfs_recall_all_layouts(cps->clp); | |
31f09607 | 608 | if (flags) |
826e0013 | 609 | nfs_expire_unused_delegation_types(cps->clp, flags); |
31f09607 AB |
610 | out: |
611 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
612 | return status; | |
613 | } | |
b9efa1b2 AA |
614 | |
615 | /* Reduce the fore channel's max_slots to the target value */ | |
f4dac4ad | 616 | __be32 nfs4_callback_recallslot(void *argp, void *resp, |
c36fca52 | 617 | struct cb_process_state *cps) |
b9efa1b2 | 618 | { |
f4dac4ad | 619 | struct cb_recallslotargs *args = argp; |
b9efa1b2 | 620 | struct nfs4_slot_table *fc_tbl; |
9733f0d9 | 621 | __be32 status; |
b9efa1b2 AA |
622 | |
623 | status = htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
c36fca52 | 624 | if (!cps->clp) /* set in cb_sequence */ |
b9efa1b2 AA |
625 | goto out; |
626 | ||
e8d92382 | 627 | dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", |
c36fca52 | 628 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), |
d5fb4ce3 | 629 | args->crsa_target_highest_slotid); |
b9efa1b2 | 630 | |
c36fca52 | 631 | fc_tbl = &cps->clp->cl_session->fc_slot_table; |
b9efa1b2 | 632 | |
bae0ac0e | 633 | status = htonl(NFS4_OK); |
b9efa1b2 | 634 | |
d5fb4ce3 | 635 | nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); |
3f10a6af | 636 | nfs41_notify_server(cps->clp); |
b9efa1b2 AA |
637 | out: |
638 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
639 | return status; | |
640 | } | |
db783688 | 641 | |
f4dac4ad | 642 | __be32 nfs4_callback_notify_lock(void *argp, void *resp, |
db783688 JL |
643 | struct cb_process_state *cps) |
644 | { | |
f4dac4ad CH |
645 | struct cb_notify_lock_args *args = argp; |
646 | ||
db783688 JL |
647 | if (!cps->clp) /* set in cb_sequence */ |
648 | return htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
649 | ||
650 | dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", | |
651 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
652 | ||
a1d617d8 JL |
653 | /* Don't wake anybody if the string looked bogus */ |
654 | if (args->cbnl_valid) | |
655 | __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); | |
656 | ||
db783688 JL |
657 | return htonl(NFS4_OK); |
658 | } | |
d49433e1 | 659 | #endif /* CONFIG_NFS_V4_1 */ |