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); |
6c342655 TM |
43 | if (IS_ERR(inode)) { |
44 | if (inode == ERR_PTR(-EAGAIN)) | |
45 | res->status = htonl(NFS4ERR_DELAY); | |
249b2eef | 46 | trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, |
7cd14861 | 47 | -ntohl(res->status)); |
c36fca52 | 48 | goto out; |
7cd14861 | 49 | } |
1da177e4 | 50 | nfsi = NFS_I(inode); |
761fe93c TM |
51 | rcu_read_lock(); |
52 | delegation = rcu_dereference(nfsi->delegation); | |
1da177e4 LT |
53 | if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) |
54 | goto out_iput; | |
55 | res->size = i_size_read(inode); | |
beb2a5ec | 56 | res->change_attr = delegation->change_attr; |
a6b6d5b8 | 57 | if (nfs_have_writebacks(inode)) |
beb2a5ec | 58 | res->change_attr++; |
95582b00 DD |
59 | res->ctime = timespec64_to_timespec(inode->i_ctime); |
60 | res->mtime = timespec64_to_timespec(inode->i_mtime); | |
1da177e4 LT |
61 | res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & |
62 | args->bitmap[0]; | |
63 | res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & | |
64 | args->bitmap[1]; | |
65 | res->status = 0; | |
66 | out_iput: | |
761fe93c | 67 | rcu_read_unlock(); |
7cd14861 | 68 | trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); |
e39d8a18 | 69 | nfs_iput_and_deactive(inode); |
1da177e4 | 70 | out: |
3110ff80 | 71 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
1da177e4 LT |
72 | return res->status; |
73 | } | |
74 | ||
f4dac4ad | 75 | __be32 nfs4_callback_recall(void *argp, void *resp, |
c36fca52 | 76 | struct cb_process_state *cps) |
1da177e4 | 77 | { |
f4dac4ad | 78 | struct cb_recallargs *args = argp; |
1da177e4 | 79 | struct inode *inode; |
e6f684f6 | 80 | __be32 res; |
1da177e4 | 81 | |
c36fca52 AA |
82 | res = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
83 | if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ | |
1da177e4 | 84 | goto out; |
1d98fe67 | 85 | |
2446ab60 | 86 | dprintk_rcu("NFS: RECALL callback request from %s\n", |
c36fca52 AA |
87 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
88 | ||
89 | res = htonl(NFS4ERR_BADHANDLE); | |
90 | inode = nfs_delegation_find_inode(cps->clp, &args->fh); | |
6c342655 TM |
91 | if (IS_ERR(inode)) { |
92 | if (inode == ERR_PTR(-EAGAIN)) | |
93 | res = htonl(NFS4ERR_DELAY); | |
e07db907 TM |
94 | trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, |
95 | &args->stateid, -ntohl(res)); | |
c36fca52 | 96 | goto out; |
e07db907 | 97 | } |
c36fca52 AA |
98 | /* Set up a helper thread to actually return the delegation */ |
99 | switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { | |
100 | case 0: | |
101 | res = 0; | |
102 | break; | |
103 | case -ENOENT: | |
8e663f0e | 104 | res = htonl(NFS4ERR_BAD_STATEID); |
c36fca52 AA |
105 | break; |
106 | default: | |
107 | res = htonl(NFS4ERR_RESOURCE); | |
108 | } | |
e07db907 TM |
109 | trace_nfs4_cb_recall(cps->clp, &args->fh, inode, |
110 | &args->stateid, -ntohl(res)); | |
e39d8a18 | 111 | nfs_iput_and_deactive(inode); |
1da177e4 | 112 | out: |
3110ff80 | 113 | dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
1da177e4 LT |
114 | return res; |
115 | } | |
d49433e1 BH |
116 | |
117 | #if defined(CONFIG_NFS_V4_1) | |
118 | ||
d36b7cf7 | 119 | /* |
7b410d9c | 120 | * Lookup a layout inode by stateid |
d36b7cf7 | 121 | * |
7b410d9c TM |
122 | * Note: returns a refcount on the inode and superblock |
123 | */ | |
124 | static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, | |
125 | const nfs4_stateid *stateid) | |
126 | { | |
127 | struct nfs_server *server; | |
128 | struct inode *inode; | |
129 | struct pnfs_layout_hdr *lo; | |
130 | ||
7b410d9c TM |
131 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
132 | list_for_each_entry(lo, &server->layouts, plh_layouts) { | |
133 | if (stateid != NULL && | |
134 | !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) | |
135 | continue; | |
136 | inode = igrab(lo->plh_inode); | |
137 | if (!inode) | |
ce5624f7 | 138 | return ERR_PTR(-EAGAIN); |
7b410d9c | 139 | if (!nfs_sb_active(inode->i_sb)) { |
2e84611b | 140 | rcu_read_unlock(); |
7b410d9c TM |
141 | spin_unlock(&clp->cl_lock); |
142 | iput(inode); | |
143 | spin_lock(&clp->cl_lock); | |
2e84611b | 144 | rcu_read_lock(); |
ce5624f7 | 145 | return ERR_PTR(-EAGAIN); |
7b410d9c TM |
146 | } |
147 | return inode; | |
148 | } | |
149 | } | |
150 | ||
ce5624f7 | 151 | return ERR_PTR(-ENOENT); |
7b410d9c TM |
152 | } |
153 | ||
154 | /* | |
155 | * Lookup a layout inode by filehandle. | |
156 | * | |
157 | * Note: returns a refcount on the inode and superblock | |
d36b7cf7 | 158 | * |
d36b7cf7 | 159 | */ |
7b410d9c TM |
160 | static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, |
161 | const struct nfs_fh *fh) | |
43f1b3da | 162 | { |
6382a441 | 163 | struct nfs_server *server; |
793b7fe5 | 164 | struct nfs_inode *nfsi; |
7b410d9c | 165 | struct inode *inode; |
d36b7cf7 | 166 | struct pnfs_layout_hdr *lo; |
43f1b3da | 167 | |
6382a441 WAA |
168 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
169 | list_for_each_entry(lo, &server->layouts, plh_layouts) { | |
793b7fe5 TM |
170 | nfsi = NFS_I(lo->plh_inode); |
171 | if (nfs_compare_fh(fh, &nfsi->fh)) | |
27999f25 | 172 | continue; |
793b7fe5 | 173 | if (nfsi->layout != lo) |
6382a441 | 174 | continue; |
7b410d9c TM |
175 | inode = igrab(lo->plh_inode); |
176 | if (!inode) | |
ce5624f7 | 177 | return ERR_PTR(-EAGAIN); |
7b410d9c | 178 | if (!nfs_sb_active(inode->i_sb)) { |
2e84611b | 179 | rcu_read_unlock(); |
7b410d9c TM |
180 | spin_unlock(&clp->cl_lock); |
181 | iput(inode); | |
182 | spin_lock(&clp->cl_lock); | |
2e84611b | 183 | rcu_read_lock(); |
ce5624f7 | 184 | return ERR_PTR(-EAGAIN); |
9c626381 | 185 | } |
7b410d9c | 186 | return inode; |
6382a441 | 187 | } |
43f1b3da | 188 | } |
d36b7cf7 | 189 | |
ce5624f7 | 190 | return ERR_PTR(-ENOENT); |
d36b7cf7 BH |
191 | } |
192 | ||
7b410d9c TM |
193 | static struct inode *nfs_layout_find_inode(struct nfs_client *clp, |
194 | const struct nfs_fh *fh, | |
195 | const nfs4_stateid *stateid) | |
d36b7cf7 | 196 | { |
7b410d9c | 197 | struct inode *inode; |
d36b7cf7 BH |
198 | |
199 | spin_lock(&clp->cl_lock); | |
200 | rcu_read_lock(); | |
7b410d9c | 201 | inode = nfs_layout_find_inode_by_stateid(clp, stateid); |
ce5624f7 | 202 | if (inode == ERR_PTR(-ENOENT)) |
7b410d9c | 203 | inode = nfs_layout_find_inode_by_fh(clp, fh); |
6382a441 | 204 | rcu_read_unlock(); |
43f1b3da | 205 | spin_unlock(&clp->cl_lock); |
6382a441 | 206 | |
7b410d9c | 207 | return inode; |
d36b7cf7 BH |
208 | } |
209 | ||
41c9127d TM |
210 | /* |
211 | * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) | |
212 | */ | |
793b7fe5 | 213 | static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, |
41c9127d TM |
214 | const nfs4_stateid *new) |
215 | { | |
216 | u32 oldseq, newseq; | |
217 | ||
bd3d16a8 | 218 | /* Is the stateid not initialised? */ |
793b7fe5 | 219 | if (!pnfs_layout_is_valid(lo)) |
bd3d16a8 | 220 | return NFS4ERR_NOMATCHING_LAYOUT; |
793b7fe5 TM |
221 | |
222 | /* Mismatched stateid? */ | |
223 | if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) | |
224 | return NFS4ERR_BAD_STATEID; | |
225 | ||
41c9127d | 226 | newseq = be32_to_cpu(new->seqid); |
793b7fe5 TM |
227 | /* Are we already in a layout recall situation? */ |
228 | if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && | |
229 | lo->plh_return_seq != 0) { | |
230 | if (newseq < lo->plh_return_seq) | |
231 | return NFS4ERR_OLD_STATEID; | |
232 | if (newseq > lo->plh_return_seq) | |
233 | return NFS4ERR_DELAY; | |
234 | goto out; | |
235 | } | |
41c9127d | 236 | |
793b7fe5 TM |
237 | /* Check that the stateid matches what we think it should be. */ |
238 | oldseq = be32_to_cpu(lo->plh_stateid.seqid); | |
41c9127d | 239 | if (newseq > oldseq + 1) |
793b7fe5 TM |
240 | return NFS4ERR_DELAY; |
241 | /* Crazy server! */ | |
242 | if (newseq <= oldseq) | |
243 | return NFS4ERR_OLD_STATEID; | |
244 | out: | |
245 | return NFS_OK; | |
41c9127d TM |
246 | } |
247 | ||
d36b7cf7 BH |
248 | static u32 initiate_file_draining(struct nfs_client *clp, |
249 | struct cb_layoutrecallargs *args) | |
250 | { | |
251 | struct inode *ino; | |
252 | struct pnfs_layout_hdr *lo; | |
253 | u32 rv = NFS4ERR_NOMATCHING_LAYOUT; | |
254 | LIST_HEAD(free_me_list); | |
255 | ||
7b410d9c | 256 | ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); |
ce5624f7 TM |
257 | if (IS_ERR(ino)) { |
258 | if (ino == ERR_PTR(-EAGAIN)) | |
259 | rv = NFS4ERR_DELAY; | |
260 | goto out_noput; | |
261 | } | |
43f1b3da | 262 | |
793b7fe5 TM |
263 | pnfs_layoutcommit_inode(ino, false); |
264 | ||
7c5d1875 CH |
265 | |
266 | spin_lock(&ino->i_lock); | |
7b410d9c TM |
267 | lo = NFS_I(ino)->layout; |
268 | if (!lo) { | |
269 | spin_unlock(&ino->i_lock); | |
270 | goto out; | |
271 | } | |
272 | pnfs_get_layout_hdr(lo); | |
793b7fe5 TM |
273 | rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); |
274 | if (rv != NFS_OK) | |
41c9127d | 275 | goto unlock; |
7c5d1875 | 276 | |
fc7ff367 TM |
277 | /* |
278 | * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) | |
279 | */ | |
280 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { | |
281 | rv = NFS4ERR_DELAY; | |
282 | goto unlock; | |
283 | } | |
284 | ||
00bcbe11 | 285 | pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); |
e0b7d420 | 286 | switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, |
6d597e17 JL |
287 | &args->cbl_range, |
288 | be32_to_cpu(args->cbl_stateid.seqid))) { | |
e0b7d420 TM |
289 | case 0: |
290 | case -EBUSY: | |
291 | /* There are layout segments that need to be returned */ | |
e0d92430 | 292 | rv = NFS4_OK; |
e0b7d420 TM |
293 | break; |
294 | case -ENOENT: | |
295 | /* Embrace your forgetfulness! */ | |
296 | rv = NFS4ERR_NOMATCHING_LAYOUT; | |
793b7fe5 | 297 | |
e0b7d420 TM |
298 | if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { |
299 | NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, | |
300 | &args->cbl_range); | |
301 | } | |
c88953d8 CH |
302 | } |
303 | unlock: | |
43f1b3da FI |
304 | spin_unlock(&ino->i_lock); |
305 | pnfs_free_lseg_list(&free_me_list); | |
b20135d0 TM |
306 | /* Free all lsegs that are attached to commit buckets */ |
307 | nfs_commit_inode(ino, 0); | |
70c3bd2b | 308 | pnfs_put_layout_hdr(lo); |
7b410d9c | 309 | out: |
ce5624f7 TM |
310 | nfs_iput_and_deactive(ino); |
311 | out_noput: | |
e07db907 TM |
312 | trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, |
313 | &args->cbl_stateid, -rv); | |
43f1b3da FI |
314 | return rv; |
315 | } | |
316 | ||
317 | static u32 initiate_bulk_draining(struct nfs_client *clp, | |
318 | struct cb_layoutrecallargs *args) | |
319 | { | |
fd9a8d71 | 320 | int stat; |
6382a441 | 321 | |
fd9a8d71 TM |
322 | if (args->cbl_recall_type == RETURN_FSID) |
323 | stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); | |
324 | else | |
325 | stat = pnfs_destroy_layouts_byclid(clp, true); | |
326 | if (stat != 0) | |
327 | return NFS4ERR_DELAY; | |
328 | return NFS4ERR_NOMATCHING_LAYOUT; | |
43f1b3da FI |
329 | } |
330 | ||
331 | static u32 do_callback_layoutrecall(struct nfs_client *clp, | |
332 | struct cb_layoutrecallargs *args) | |
333 | { | |
43f1b3da | 334 | if (args->cbl_recall_type == RETURN_FILE) |
1a916ce0 AS |
335 | return initiate_file_draining(clp, args); |
336 | return initiate_bulk_draining(clp, args); | |
43f1b3da FI |
337 | } |
338 | ||
f4dac4ad CH |
339 | __be32 nfs4_callback_layoutrecall(void *argp, void *resp, |
340 | struct cb_process_state *cps) | |
f2a62561 | 341 | { |
f4dac4ad | 342 | struct cb_layoutrecallargs *args = argp; |
5694a4f8 | 343 | u32 res = NFS4ERR_OP_NOT_IN_SESSION; |
43f1b3da FI |
344 | |
345 | if (cps->clp) | |
346 | res = do_callback_layoutrecall(cps->clp, args); | |
43f1b3da | 347 | return cpu_to_be32(res); |
f2a62561 FI |
348 | } |
349 | ||
36840370 AB |
350 | static void pnfs_recall_all_layouts(struct nfs_client *clp) |
351 | { | |
352 | struct cb_layoutrecallargs args; | |
353 | ||
354 | /* Pretend we got a CB_LAYOUTRECALL(ALL) */ | |
355 | memset(&args, 0, sizeof(args)); | |
356 | args.cbl_recall_type = RETURN_ALL; | |
357 | /* FIXME we ignore errors, what should we do? */ | |
358 | do_callback_layoutrecall(clp, &args); | |
359 | } | |
360 | ||
f4dac4ad CH |
361 | __be32 nfs4_callback_devicenotify(void *argp, void *resp, |
362 | struct cb_process_state *cps) | |
1be5683b | 363 | { |
f4dac4ad | 364 | struct cb_devicenotifyargs *args = argp; |
1be5683b ME |
365 | int i; |
366 | __be32 res = 0; | |
367 | struct nfs_client *clp = cps->clp; | |
368 | struct nfs_server *server = NULL; | |
369 | ||
1be5683b ME |
370 | if (!clp) { |
371 | res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); | |
372 | goto out; | |
373 | } | |
374 | ||
375 | for (i = 0; i < args->ndevs; i++) { | |
376 | struct cb_devicenotifyitem *dev = &args->devs[i]; | |
377 | ||
378 | if (!server || | |
379 | server->pnfs_curr_ld->id != dev->cbd_layout_type) { | |
380 | rcu_read_lock(); | |
381 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
382 | if (server->pnfs_curr_ld && | |
383 | server->pnfs_curr_ld->id == dev->cbd_layout_type) { | |
384 | rcu_read_unlock(); | |
385 | goto found; | |
386 | } | |
387 | rcu_read_unlock(); | |
1be5683b ME |
388 | continue; |
389 | } | |
390 | ||
391 | found: | |
35c8bb54 | 392 | nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); |
1be5683b ME |
393 | } |
394 | ||
395 | out: | |
396 | kfree(args->devs); | |
1be5683b ME |
397 | return res; |
398 | } | |
399 | ||
68f3f901 RL |
400 | /* |
401 | * Validate the sequenceID sent by the server. | |
402 | * Return success if the sequenceID is one more than what we last saw on | |
403 | * this slot, accounting for wraparound. Increments the slot's sequence. | |
404 | * | |
4911096f AA |
405 | * We don't yet implement a duplicate request cache, instead we set the |
406 | * back channel ca_maxresponsesize_cached to zero. This is OK for now | |
68f3f901 RL |
407 | * since we only currently implement idempotent callbacks anyway. |
408 | * | |
409 | * We have a single slot backchannel at this time, so we don't bother | |
410 | * checking the used_slots bit array on the table. The lower layer guarantees | |
411 | * a single outstanding callback request at a time. | |
412 | */ | |
9733f0d9 | 413 | static __be32 |
5f83d86c TM |
414 | validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, |
415 | const struct cb_sequenceargs * args) | |
68f3f901 | 416 | { |
c5833f0d CL |
417 | __be32 ret; |
418 | ||
419 | ret = cpu_to_be32(NFS4ERR_BADSLOT); | |
f4f58ed1 | 420 | if (args->csa_slotid > tbl->server_highest_slotid) |
c5833f0d | 421 | goto out_err; |
68f3f901 | 422 | |
68f3f901 | 423 | /* Replay */ |
b2f28bd7 | 424 | if (args->csa_sequenceid == slot->seq_nr) { |
c5833f0d | 425 | ret = cpu_to_be32(NFS4ERR_DELAY); |
810d82e6 | 426 | if (nfs4_test_locked_slot(tbl, slot->slot_nr)) |
c5833f0d CL |
427 | goto out_err; |
428 | ||
4911096f | 429 | /* Signal process_op to set this error on next op */ |
c5833f0d | 430 | ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); |
4911096f | 431 | if (args->csa_cachethis == 0) |
c5833f0d | 432 | goto out_err; |
4911096f | 433 | |
80f96427 | 434 | /* Liar! We never allowed you to set csa_cachethis != 0 */ |
c5833f0d CL |
435 | ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); |
436 | goto out_err; | |
68f3f901 RL |
437 | } |
438 | ||
fc40724f | 439 | /* Note: wraparound relies on seq_nr being of type u32 */ |
68f3f901 | 440 | /* Misordered request */ |
c5833f0d CL |
441 | ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); |
442 | if (args->csa_sequenceid != slot->seq_nr + 1) | |
443 | goto out_err; | |
444 | ||
445 | return cpu_to_be32(NFS4_OK); | |
446 | ||
447 | out_err: | |
448 | trace_nfs4_cb_seqid_err(args, ret); | |
449 | return ret; | |
68f3f901 RL |
450 | } |
451 | ||
a7989c3e MS |
452 | /* |
453 | * For each referring call triple, check the session's slot table for | |
454 | * a match. If the slot is in use and the sequence numbers match, the | |
455 | * client is still waiting for a response to the original request. | |
456 | */ | |
8618289c | 457 | static int referring_call_exists(struct nfs_client *clp, |
a7989c3e | 458 | uint32_t nrclists, |
8618289c TM |
459 | struct referring_call_list *rclists, |
460 | spinlock_t *lock) | |
461 | __releases(lock) | |
462 | __acquires(lock) | |
a7989c3e | 463 | { |
8618289c | 464 | int status = 0; |
a7989c3e MS |
465 | int i, j; |
466 | struct nfs4_session *session; | |
467 | struct nfs4_slot_table *tbl; | |
468 | struct referring_call_list *rclist; | |
469 | struct referring_call *ref; | |
470 | ||
471 | /* | |
472 | * XXX When client trunking is implemented, this becomes | |
473 | * a session lookup from within the loop | |
474 | */ | |
475 | session = clp->cl_session; | |
476 | tbl = &session->fc_slot_table; | |
477 | ||
478 | for (i = 0; i < nrclists; i++) { | |
479 | rclist = &rclists[i]; | |
480 | if (memcmp(session->sess_id.data, | |
481 | rclist->rcl_sessionid.data, | |
482 | NFS4_MAX_SESSIONID_LEN) != 0) | |
483 | continue; | |
484 | ||
485 | for (j = 0; j < rclist->rcl_nrefcalls; j++) { | |
486 | ref = &rclist->rcl_refcalls[j]; | |
8618289c | 487 | spin_unlock(lock); |
045d2a6d TM |
488 | status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, |
489 | ref->rc_sequenceid, HZ >> 1) < 0; | |
8618289c | 490 | spin_lock(lock); |
a7989c3e MS |
491 | if (status) |
492 | goto out; | |
493 | } | |
494 | } | |
495 | ||
496 | out: | |
497 | return status; | |
498 | } | |
499 | ||
f4dac4ad | 500 | __be32 nfs4_callback_sequence(void *argp, void *resp, |
c36fca52 | 501 | struct cb_process_state *cps) |
d49433e1 | 502 | { |
f4dac4ad CH |
503 | struct cb_sequenceargs *args = argp; |
504 | struct cb_sequenceres *res = resp; | |
55a67399 | 505 | struct nfs4_slot_table *tbl; |
e937ee71 | 506 | struct nfs4_slot *slot; |
68f3f901 | 507 | struct nfs_client *clp; |
9733f0d9 | 508 | int i; |
778be232 | 509 | __be32 status = htonl(NFS4ERR_BADSESSION); |
d49433e1 | 510 | |
459de2ed BS |
511 | clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, |
512 | &args->csa_sessionid, cps->minorversion); | |
68f3f901 RL |
513 | if (clp == NULL) |
514 | goto out; | |
515 | ||
b1c0df5f TM |
516 | if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) |
517 | goto out; | |
e937ee71 | 518 | |
55a67399 TM |
519 | tbl = &clp->cl_session->bc_slot_table; |
520 | ||
e5003b2f TM |
521 | /* Set up res before grabbing the spinlock */ |
522 | memcpy(&res->csr_sessionid, &args->csa_sessionid, | |
523 | sizeof(res->csr_sessionid)); | |
524 | res->csr_sequenceid = args->csa_sequenceid; | |
525 | res->csr_slotid = args->csa_slotid; | |
526 | ||
55a67399 | 527 | spin_lock(&tbl->slot_tbl_lock); |
42acd021 | 528 | /* state manager is resetting the session */ |
774d5f14 | 529 | if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
55a67399 | 530 | status = htonl(NFS4ERR_DELAY); |
910ac68a TM |
531 | /* Return NFS4ERR_BADSESSION if we're draining the session |
532 | * in order to reset it. | |
533 | */ | |
534 | if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) | |
535 | status = htonl(NFS4ERR_BADSESSION); | |
4e54ab8d | 536 | goto out_unlock; |
42acd021 AA |
537 | } |
538 | ||
810d82e6 TM |
539 | status = htonl(NFS4ERR_BADSLOT); |
540 | slot = nfs4_lookup_slot(tbl, args->csa_slotid); | |
541 | if (IS_ERR(slot)) | |
542 | goto out_unlock; | |
e5003b2f TM |
543 | |
544 | res->csr_highestslotid = tbl->server_highest_slotid; | |
545 | res->csr_target_highestslotid = tbl->target_highest_slotid; | |
546 | ||
5f83d86c TM |
547 | status = validate_seqid(tbl, slot, args); |
548 | if (status) | |
549 | goto out_unlock; | |
810d82e6 TM |
550 | if (!nfs4_try_to_lock_slot(tbl, slot)) { |
551 | status = htonl(NFS4ERR_DELAY); | |
552 | goto out_unlock; | |
553 | } | |
554 | cps->slot = slot; | |
5f83d86c | 555 | |
80f96427 | 556 | /* The ca_maxresponsesize_cached is 0 with no DRC */ |
c2985d00 OK |
557 | if (args->csa_cachethis != 0) { |
558 | status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); | |
559 | goto out_unlock; | |
560 | } | |
80f96427 | 561 | |
72ce2b3c MS |
562 | /* |
563 | * Check for pending referring calls. If a match is found, a | |
564 | * related callback was received before the response to the original | |
565 | * call. | |
566 | */ | |
8618289c TM |
567 | if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, |
568 | &tbl->slot_tbl_lock) < 0) { | |
72ce2b3c | 569 | status = htonl(NFS4ERR_DELAY); |
4e54ab8d | 570 | goto out_unlock; |
72ce2b3c MS |
571 | } |
572 | ||
e937ee71 KM |
573 | /* |
574 | * RFC5661 20.9.3 | |
575 | * If CB_SEQUENCE returns an error, then the state of the slot | |
576 | * (sequence ID, cached reply) MUST NOT change. | |
577 | */ | |
5f83d86c | 578 | slot->seq_nr = args->csa_sequenceid; |
4e54ab8d TM |
579 | out_unlock: |
580 | spin_unlock(&tbl->slot_tbl_lock); | |
e937ee71 | 581 | |
68f3f901 | 582 | out: |
2c4cdf8f | 583 | cps->clp = clp; /* put in nfs4_callback_compound */ |
72ce2b3c MS |
584 | for (i = 0; i < args->csa_nrclists; i++) |
585 | kfree(args->csa_rclists[i].rcl_refcalls); | |
586 | kfree(args->csa_rclists); | |
587 | ||
c36fca52 AA |
588 | if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { |
589 | cps->drc_status = status; | |
590 | status = 0; | |
591 | } else | |
4911096f | 592 | res->csr_status = status; |
c36fca52 | 593 | |
2f92ae34 | 594 | trace_nfs4_cb_sequence(args, res, status); |
4911096f | 595 | return status; |
d49433e1 BH |
596 | } |
597 | ||
36840370 | 598 | static bool |
6d243a23 | 599 | validate_bitmap_values(unsigned int mask) |
36840370 AB |
600 | { |
601 | return (mask & ~RCA4_TYPE_MASK_ALL) == 0; | |
602 | } | |
603 | ||
f4dac4ad | 604 | __be32 nfs4_callback_recallany(void *argp, void *resp, |
c36fca52 | 605 | struct cb_process_state *cps) |
31f09607 | 606 | { |
f4dac4ad | 607 | struct cb_recallanyargs *args = argp; |
9733f0d9 | 608 | __be32 status; |
31f09607 AB |
609 | fmode_t flags = 0; |
610 | ||
36840370 | 611 | status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); |
c36fca52 | 612 | if (!cps->clp) /* set in cb_sequence */ |
31f09607 AB |
613 | goto out; |
614 | ||
2446ab60 | 615 | dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", |
c36fca52 | 616 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
31f09607 | 617 | |
36840370 AB |
618 | status = cpu_to_be32(NFS4ERR_INVAL); |
619 | if (!validate_bitmap_values(args->craa_type_mask)) | |
620 | goto out; | |
621 | ||
622 | status = cpu_to_be32(NFS4_OK); | |
6d243a23 | 623 | if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) |
31f09607 | 624 | flags = FMODE_READ; |
6d243a23 | 625 | if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) |
31f09607 | 626 | flags |= FMODE_WRITE; |
31f09607 | 627 | if (flags) |
826e0013 | 628 | nfs_expire_unused_delegation_types(cps->clp, flags); |
6d243a23 TM |
629 | |
630 | if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) | |
631 | pnfs_recall_all_layouts(cps->clp); | |
31f09607 AB |
632 | out: |
633 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
634 | return status; | |
635 | } | |
b9efa1b2 AA |
636 | |
637 | /* Reduce the fore channel's max_slots to the target value */ | |
f4dac4ad | 638 | __be32 nfs4_callback_recallslot(void *argp, void *resp, |
c36fca52 | 639 | struct cb_process_state *cps) |
b9efa1b2 | 640 | { |
f4dac4ad | 641 | struct cb_recallslotargs *args = argp; |
b9efa1b2 | 642 | struct nfs4_slot_table *fc_tbl; |
9733f0d9 | 643 | __be32 status; |
b9efa1b2 AA |
644 | |
645 | status = htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
c36fca52 | 646 | if (!cps->clp) /* set in cb_sequence */ |
b9efa1b2 AA |
647 | goto out; |
648 | ||
e8d92382 | 649 | dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", |
c36fca52 | 650 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), |
d5fb4ce3 | 651 | args->crsa_target_highest_slotid); |
b9efa1b2 | 652 | |
c36fca52 | 653 | fc_tbl = &cps->clp->cl_session->fc_slot_table; |
b9efa1b2 | 654 | |
bae0ac0e | 655 | status = htonl(NFS4_OK); |
b9efa1b2 | 656 | |
d5fb4ce3 | 657 | nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); |
3f10a6af | 658 | nfs41_notify_server(cps->clp); |
b9efa1b2 AA |
659 | out: |
660 | dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); | |
661 | return status; | |
662 | } | |
db783688 | 663 | |
f4dac4ad | 664 | __be32 nfs4_callback_notify_lock(void *argp, void *resp, |
db783688 JL |
665 | struct cb_process_state *cps) |
666 | { | |
f4dac4ad CH |
667 | struct cb_notify_lock_args *args = argp; |
668 | ||
db783688 JL |
669 | if (!cps->clp) /* set in cb_sequence */ |
670 | return htonl(NFS4ERR_OP_NOT_IN_SESSION); | |
671 | ||
672 | dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", | |
673 | rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
674 | ||
a1d617d8 JL |
675 | /* Don't wake anybody if the string looked bogus */ |
676 | if (args->cbnl_valid) | |
677 | __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); | |
678 | ||
db783688 JL |
679 | return htonl(NFS4_OK); |
680 | } | |
d49433e1 | 681 | #endif /* CONFIG_NFS_V4_1 */ |
5178a125 | 682 | #ifdef CONFIG_NFS_V4_2 |
62164f31 OK |
683 | static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, |
684 | struct cb_offloadargs *args) | |
685 | { | |
686 | cp_state->count = args->wr_count; | |
687 | cp_state->error = args->error; | |
688 | if (!args->error) { | |
689 | cp_state->verf.committed = args->wr_writeverf.committed; | |
690 | memcpy(&cp_state->verf.verifier.data[0], | |
691 | &args->wr_writeverf.verifier.data[0], | |
692 | NFS4_VERIFIER_SIZE); | |
693 | } | |
694 | } | |
695 | ||
696 | __be32 nfs4_callback_offload(void *data, void *dummy, | |
5178a125 OK |
697 | struct cb_process_state *cps) |
698 | { | |
62164f31 OK |
699 | struct cb_offloadargs *args = data; |
700 | struct nfs_server *server; | |
99f2c555 | 701 | struct nfs4_copy_state *copy, *tmp_copy; |
bc0c9079 | 702 | bool found = false; |
62164f31 | 703 | |
99f2c555 OK |
704 | copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); |
705 | if (!copy) | |
706 | return htonl(NFS4ERR_SERVERFAULT); | |
707 | ||
bc0c9079 | 708 | spin_lock(&cps->clp->cl_lock); |
62164f31 OK |
709 | rcu_read_lock(); |
710 | list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, | |
711 | client_link) { | |
99f2c555 | 712 | list_for_each_entry(tmp_copy, &server->ss_copies, copies) { |
62164f31 | 713 | if (memcmp(args->coa_stateid.other, |
99f2c555 | 714 | tmp_copy->stateid.other, |
62164f31 OK |
715 | sizeof(args->coa_stateid.other))) |
716 | continue; | |
99f2c555 OK |
717 | nfs4_copy_cb_args(tmp_copy, args); |
718 | complete(&tmp_copy->completion); | |
bc0c9079 | 719 | found = true; |
62164f31 OK |
720 | goto out; |
721 | } | |
62164f31 OK |
722 | } |
723 | out: | |
724 | rcu_read_unlock(); | |
bc0c9079 | 725 | if (!found) { |
bc0c9079 OK |
726 | memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); |
727 | nfs4_copy_cb_args(copy, args); | |
728 | list_add_tail(©->copies, &cps->clp->pending_cb_stateids); | |
99f2c555 OK |
729 | } else |
730 | kfree(copy); | |
bc0c9079 | 731 | spin_unlock(&cps->clp->cl_lock); |
62164f31 | 732 | |
5178a125 OK |
733 | return 0; |
734 | } | |
735 | #endif /* CONFIG_NFS_V4_2 */ |