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Merge tag 'hwmon-for-v6.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / fs / nfs / nfs42proc.c
blob531c9c20ef1d1b383b28d00b7dc8d890990ff2c9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
4 */
5 #include <linux/fs.h>
6 #include <linux/sunrpc/addr.h>
7 #include <linux/sunrpc/sched.h>
8 #include <linux/nfs.h>
9 #include <linux/nfs3.h>
10 #include <linux/nfs4.h>
11 #include <linux/nfs_xdr.h>
12 #include <linux/nfs_fs.h>
13 #include "nfs4_fs.h"
14 #include "nfs42.h"
15 #include "iostat.h"
16 #include "pnfs.h"
17 #include "nfs4session.h"
18 #include "internal.h"
19 #include "delegation.h"
20 #include "nfs4trace.h"
21
22 #define NFSDBG_FACILITY NFSDBG_PROC
23 static int nfs42_do_offload_cancel_async(struct file *dst, nfs4_stateid *std);
24
25 static void nfs42_set_netaddr(struct file *filep, struct nfs42_netaddr *naddr)
26 {
27 struct nfs_client *clp = (NFS_SERVER(file_inode(filep)))->nfs_client;
28 unsigned short port = 2049;
29
30 rcu_read_lock();
31 naddr->netid_len = scnprintf(naddr->netid,
32 sizeof(naddr->netid), "%s",
33 rpc_peeraddr2str(clp->cl_rpcclient,
34 RPC_DISPLAY_NETID));
35 naddr->addr_len = scnprintf(naddr->addr,
36 sizeof(naddr->addr),
37 "%s.%u.%u",
38 rpc_peeraddr2str(clp->cl_rpcclient,
39 RPC_DISPLAY_ADDR),
40 port >> 8, port & 255);
41 rcu_read_unlock();
42 }
43
44 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
45 struct nfs_lock_context *lock, loff_t offset, loff_t len)
46 {
47 struct inode *inode = file_inode(filep);
48 struct nfs_server *server = NFS_SERVER(inode);
49 u32 bitmask[NFS_BITMASK_SZ];
50 struct nfs42_falloc_args args = {
51 .falloc_fh = NFS_FH(inode),
52 .falloc_offset = offset,
53 .falloc_length = len,
54 .falloc_bitmask = bitmask,
55 };
56 struct nfs42_falloc_res res = {
57 .falloc_server = server,
58 };
59 int status;
60
61 msg->rpc_argp = &args;
62 msg->rpc_resp = &res;
63
64 status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
65 lock, FMODE_WRITE);
66 if (status) {
67 if (status == -EAGAIN)
68 status = -NFS4ERR_BAD_STATEID;
69 return status;
70 }
71
72 nfs4_bitmask_set(bitmask, server->cache_consistency_bitmask, inode,
73 NFS_INO_INVALID_BLOCKS);
74
75 res.falloc_fattr = nfs_alloc_fattr();
76 if (!res.falloc_fattr)
77 return -ENOMEM;
78
79 status = nfs4_call_sync(server->client, server, msg,
80 &args.seq_args, &res.seq_res, 0);
81 if (status == 0) {
82 if (nfs_should_remove_suid(inode)) {
83 spin_lock(&inode->i_lock);
84 nfs_set_cache_invalid(inode,
85 NFS_INO_REVAL_FORCED | NFS_INO_INVALID_MODE);
86 spin_unlock(&inode->i_lock);
87 }
88 status = nfs_post_op_update_inode_force_wcc(inode,
89 res.falloc_fattr);
90 }
91 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE])
92 trace_nfs4_fallocate(inode, &args, status);
93 else
94 trace_nfs4_deallocate(inode, &args, status);
95 kfree(res.falloc_fattr);
96 return status;
97 }
98
99 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
100 loff_t offset, loff_t len)
101 {
102 struct inode *inode = file_inode(filep);
103 struct nfs_server *server = NFS_SERVER(inode);
104 struct nfs4_exception exception = { };
105 struct nfs_lock_context *lock;
106 int err;
107
108 lock = nfs_get_lock_context(nfs_file_open_context(filep));
109 if (IS_ERR(lock))
110 return PTR_ERR(lock);
111
112 exception.inode = inode;
113 exception.state = lock->open_context->state;
114
115 err = nfs_sync_inode(inode);
116 if (err)
117 goto out;
118
119 do {
120 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
121 if (err == -ENOTSUPP) {
122 err = -EOPNOTSUPP;
123 break;
124 }
125 err = nfs4_handle_exception(server, err, &exception);
126 } while (exception.retry);
127 out:
128 nfs_put_lock_context(lock);
129 return err;
130 }
131
132 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
133 {
134 struct rpc_message msg = {
135 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
136 };
137 struct inode *inode = file_inode(filep);
138 int err;
139
140 if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
141 return -EOPNOTSUPP;
142
143 inode_lock(inode);
144
145 err = nfs42_proc_fallocate(&msg, filep, offset, len);
146 if (err == -EOPNOTSUPP)
147 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
148
149 inode_unlock(inode);
150 return err;
151 }
152
153 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
154 {
155 struct rpc_message msg = {
156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
157 };
158 struct inode *inode = file_inode(filep);
159 int err;
160
161 if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
162 return -EOPNOTSUPP;
163
164 inode_lock(inode);
165
166 err = nfs42_proc_fallocate(&msg, filep, offset, len);
167 if (err == 0)
168 truncate_pagecache_range(inode, offset, (offset + len) -1);
169 if (err == -EOPNOTSUPP)
170 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
171
172 inode_unlock(inode);
173 return err;
174 }
175
176 static int handle_async_copy(struct nfs42_copy_res *res,
177 struct nfs_server *dst_server,
178 struct nfs_server *src_server,
179 struct file *src,
180 struct file *dst,
181 nfs4_stateid *src_stateid,
182 bool *restart)
183 {
184 struct nfs4_copy_state *copy, *tmp_copy = NULL, *iter;
185 int status = NFS4_OK;
186 struct nfs_open_context *dst_ctx = nfs_file_open_context(dst);
187 struct nfs_open_context *src_ctx = nfs_file_open_context(src);
188
189 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
190 if (!copy)
191 return -ENOMEM;
192
193 spin_lock(&dst_server->nfs_client->cl_lock);
194 list_for_each_entry(iter,
195 &dst_server->nfs_client->pending_cb_stateids,
196 copies) {
197 if (memcmp(&res->write_res.stateid, &iter->stateid,
198 NFS4_STATEID_SIZE))
199 continue;
200 tmp_copy = iter;
201 list_del(&iter->copies);
202 break;
203 }
204 if (tmp_copy) {
205 spin_unlock(&dst_server->nfs_client->cl_lock);
206 kfree(copy);
207 copy = tmp_copy;
208 goto out;
209 }
210
211 memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
212 init_completion(&copy->completion);
213 copy->parent_dst_state = dst_ctx->state;
214 copy->parent_src_state = src_ctx->state;
215
216 list_add_tail(&copy->copies, &dst_server->ss_copies);
217 spin_unlock(&dst_server->nfs_client->cl_lock);
218
219 if (dst_server != src_server) {
220 spin_lock(&src_server->nfs_client->cl_lock);
221 list_add_tail(&copy->src_copies, &src_server->ss_src_copies);
222 spin_unlock(&src_server->nfs_client->cl_lock);
223 }
224
225 status = wait_for_completion_interruptible(&copy->completion);
226 spin_lock(&dst_server->nfs_client->cl_lock);
227 list_del_init(&copy->copies);
228 spin_unlock(&dst_server->nfs_client->cl_lock);
229 if (dst_server != src_server) {
230 spin_lock(&src_server->nfs_client->cl_lock);
231 list_del_init(&copy->src_copies);
232 spin_unlock(&src_server->nfs_client->cl_lock);
233 }
234 if (status == -ERESTARTSYS) {
235 goto out_cancel;
236 } else if (copy->flags || copy->error == NFS4ERR_PARTNER_NO_AUTH) {
237 status = -EAGAIN;
238 *restart = true;
239 goto out_cancel;
240 }
241 out:
242 res->write_res.count = copy->count;
243 memcpy(&res->write_res.verifier, &copy->verf, sizeof(copy->verf));
244 status = -copy->error;
245
246 out_free:
247 kfree(copy);
248 return status;
249 out_cancel:
250 nfs42_do_offload_cancel_async(dst, &copy->stateid);
251 if (!nfs42_files_from_same_server(src, dst))
252 nfs42_do_offload_cancel_async(src, src_stateid);
253 goto out_free;
254 }
255
256 static int process_copy_commit(struct file *dst, loff_t pos_dst,
257 struct nfs42_copy_res *res)
258 {
259 struct nfs_commitres cres;
260 int status = -ENOMEM;
261
262 cres.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_KERNEL);
263 if (!cres.verf)
264 goto out;
265
266 status = nfs4_proc_commit(dst, pos_dst, res->write_res.count, &cres);
267 if (status)
268 goto out_free;
269 if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
270 &cres.verf->verifier)) {
271 dprintk("commit verf differs from copy verf\n");
272 status = -EAGAIN;
273 }
274 out_free:
275 kfree(cres.verf);
276 out:
277 return status;
278 }
279
280 /**
281 * nfs42_copy_dest_done - perform inode cache updates after clone/copy offload
282 * @inode: pointer to destination inode
283 * @pos: destination offset
284 * @len: copy length
285 *
286 * Punch a hole in the inode page cache, so that the NFS client will
287 * know to retrieve new data.
288 * Update the file size if necessary, and then mark the inode as having
289 * invalid cached values for change attribute, ctime, mtime and space used.
290 */
291 static void nfs42_copy_dest_done(struct inode *inode, loff_t pos, loff_t len)
292 {
293 loff_t newsize = pos + len;
294 loff_t end = newsize - 1;
295
296 WARN_ON_ONCE(invalidate_inode_pages2_range(inode->i_mapping,
297 pos >> PAGE_SHIFT, end >> PAGE_SHIFT));
298
299 spin_lock(&inode->i_lock);
300 if (newsize > i_size_read(inode))
301 i_size_write(inode, newsize);
302 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
303 NFS_INO_INVALID_CTIME |
304 NFS_INO_INVALID_MTIME |
305 NFS_INO_INVALID_BLOCKS);
306 spin_unlock(&inode->i_lock);
307 }
308
309 static ssize_t _nfs42_proc_copy(struct file *src,
310 struct nfs_lock_context *src_lock,
311 struct file *dst,
312 struct nfs_lock_context *dst_lock,
313 struct nfs42_copy_args *args,
314 struct nfs42_copy_res *res,
315 struct nl4_server *nss,
316 nfs4_stateid *cnr_stateid,
317 bool *restart)
318 {
319 struct rpc_message msg = {
320 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
321 .rpc_argp = args,
322 .rpc_resp = res,
323 };
324 struct inode *dst_inode = file_inode(dst);
325 struct inode *src_inode = file_inode(src);
326 struct nfs_server *dst_server = NFS_SERVER(dst_inode);
327 struct nfs_server *src_server = NFS_SERVER(src_inode);
328 loff_t pos_src = args->src_pos;
329 loff_t pos_dst = args->dst_pos;
330 size_t count = args->count;
331 ssize_t status;
332
333 if (nss) {
334 args->cp_src = nss;
335 nfs4_stateid_copy(&args->src_stateid, cnr_stateid);
336 } else {
337 status = nfs4_set_rw_stateid(&args->src_stateid,
338 src_lock->open_context, src_lock, FMODE_READ);
339 if (status) {
340 if (status == -EAGAIN)
341 status = -NFS4ERR_BAD_STATEID;
342 return status;
343 }
344 }
345 status = nfs_filemap_write_and_wait_range(src->f_mapping,
346 pos_src, pos_src + (loff_t)count - 1);
347 if (status)
348 return status;
349
350 status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
351 dst_lock, FMODE_WRITE);
352 if (status) {
353 if (status == -EAGAIN)
354 status = -NFS4ERR_BAD_STATEID;
355 return status;
356 }
357
358 status = nfs_sync_inode(dst_inode);
359 if (status)
360 return status;
361
362 res->commit_res.verf = NULL;
363 if (args->sync) {
364 res->commit_res.verf =
365 kzalloc(sizeof(struct nfs_writeverf), GFP_KERNEL);
366 if (!res->commit_res.verf)
367 return -ENOMEM;
368 }
369 set_bit(NFS_CLNT_SRC_SSC_COPY_STATE,
370 &src_lock->open_context->state->flags);
371 set_bit(NFS_CLNT_DST_SSC_COPY_STATE,
372 &dst_lock->open_context->state->flags);
373
374 status = nfs4_call_sync(dst_server->client, dst_server, &msg,
375 &args->seq_args, &res->seq_res, 0);
376 trace_nfs4_copy(src_inode, dst_inode, args, res, nss, status);
377 if (status == -ENOTSUPP)
378 dst_server->caps &= ~NFS_CAP_COPY;
379 if (status)
380 goto out;
381
382 if (args->sync &&
383 nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
384 &res->commit_res.verf->verifier)) {
385 status = -EAGAIN;
386 goto out;
387 }
388
389 if (!res->synchronous) {
390 status = handle_async_copy(res, dst_server, src_server, src,
391 dst, &args->src_stateid, restart);
392 if (status)
393 goto out;
394 }
395
396 if ((!res->synchronous || !args->sync) &&
397 res->write_res.verifier.committed != NFS_FILE_SYNC) {
398 status = process_copy_commit(dst, pos_dst, res);
399 if (status)
400 goto out;
401 }
402
403 nfs42_copy_dest_done(dst_inode, pos_dst, res->write_res.count);
404 nfs_invalidate_atime(src_inode);
405 status = res->write_res.count;
406 out:
407 if (args->sync)
408 kfree(res->commit_res.verf);
409 return status;
410 }
411
412 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
413 struct file *dst, loff_t pos_dst, size_t count,
414 struct nl4_server *nss,
415 nfs4_stateid *cnr_stateid, bool sync)
416 {
417 struct nfs_server *server = NFS_SERVER(file_inode(dst));
418 struct nfs_lock_context *src_lock;
419 struct nfs_lock_context *dst_lock;
420 struct nfs42_copy_args args = {
421 .src_fh = NFS_FH(file_inode(src)),
422 .src_pos = pos_src,
423 .dst_fh = NFS_FH(file_inode(dst)),
424 .dst_pos = pos_dst,
425 .count = count,
426 .sync = sync,
427 };
428 struct nfs42_copy_res res;
429 struct nfs4_exception src_exception = {
430 .inode = file_inode(src),
431 .stateid = &args.src_stateid,
432 };
433 struct nfs4_exception dst_exception = {
434 .inode = file_inode(dst),
435 .stateid = &args.dst_stateid,
436 };
437 ssize_t err, err2;
438 bool restart = false;
439
440 src_lock = nfs_get_lock_context(nfs_file_open_context(src));
441 if (IS_ERR(src_lock))
442 return PTR_ERR(src_lock);
443
444 src_exception.state = src_lock->open_context->state;
445
446 dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
447 if (IS_ERR(dst_lock)) {
448 err = PTR_ERR(dst_lock);
449 goto out_put_src_lock;
450 }
451
452 dst_exception.state = dst_lock->open_context->state;
453
454 do {
455 inode_lock(file_inode(dst));
456 err = _nfs42_proc_copy(src, src_lock,
457 dst, dst_lock,
458 &args, &res,
459 nss, cnr_stateid, &restart);
460 inode_unlock(file_inode(dst));
461
462 if (err >= 0)
463 break;
464 if ((err == -ENOTSUPP ||
465 err == -NFS4ERR_OFFLOAD_DENIED) &&
466 nfs42_files_from_same_server(src, dst)) {
467 err = -EOPNOTSUPP;
468 break;
469 } else if (err == -EAGAIN) {
470 if (!restart) {
471 dst_exception.retry = 1;
472 continue;
473 }
474 break;
475 } else if (err == -NFS4ERR_OFFLOAD_NO_REQS &&
476 args.sync != res.synchronous) {
477 args.sync = res.synchronous;
478 dst_exception.retry = 1;
479 continue;
480 } else if ((err == -ESTALE ||
481 err == -NFS4ERR_OFFLOAD_DENIED ||
482 err == -ENOTSUPP) &&
483 !nfs42_files_from_same_server(src, dst)) {
484 nfs42_do_offload_cancel_async(src, &args.src_stateid);
485 err = -EOPNOTSUPP;
486 break;
487 }
488
489 err2 = nfs4_handle_exception(server, err, &src_exception);
490 err = nfs4_handle_exception(server, err, &dst_exception);
491 if (!err)
492 err = err2;
493 } while (src_exception.retry || dst_exception.retry);
494
495 nfs_put_lock_context(dst_lock);
496 out_put_src_lock:
497 nfs_put_lock_context(src_lock);
498 return err;
499 }
500
501 struct nfs42_offloadcancel_data {
502 struct nfs_server *seq_server;
503 struct nfs42_offload_status_args args;
504 struct nfs42_offload_status_res res;
505 };
506
507 static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
508 {
509 struct nfs42_offloadcancel_data *data = calldata;
510
511 nfs4_setup_sequence(data->seq_server->nfs_client,
512 &data->args.osa_seq_args,
513 &data->res.osr_seq_res, task);
514 }
515
516 static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
517 {
518 struct nfs42_offloadcancel_data *data = calldata;
519
520 trace_nfs4_offload_cancel(&data->args, task->tk_status);
521 nfs41_sequence_done(task, &data->res.osr_seq_res);
522 if (task->tk_status &&
523 nfs4_async_handle_error(task, data->seq_server, NULL,
524 NULL) == -EAGAIN)
525 rpc_restart_call_prepare(task);
526 }
527
528 static void nfs42_free_offloadcancel_data(void *data)
529 {
530 kfree(data);
531 }
532
533 static const struct rpc_call_ops nfs42_offload_cancel_ops = {
534 .rpc_call_prepare = nfs42_offload_cancel_prepare,
535 .rpc_call_done = nfs42_offload_cancel_done,
536 .rpc_release = nfs42_free_offloadcancel_data,
537 };
538
539 static int nfs42_do_offload_cancel_async(struct file *dst,
540 nfs4_stateid *stateid)
541 {
542 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
543 struct nfs42_offloadcancel_data *data = NULL;
544 struct nfs_open_context *ctx = nfs_file_open_context(dst);
545 struct rpc_task *task;
546 struct rpc_message msg = {
547 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OFFLOAD_CANCEL],
548 .rpc_cred = ctx->cred,
549 };
550 struct rpc_task_setup task_setup_data = {
551 .rpc_client = dst_server->client,
552 .rpc_message = &msg,
553 .callback_ops = &nfs42_offload_cancel_ops,
554 .workqueue = nfsiod_workqueue,
555 .flags = RPC_TASK_ASYNC,
556 };
557 int status;
558
559 if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL))
560 return -EOPNOTSUPP;
561
562 data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_KERNEL);
563 if (data == NULL)
564 return -ENOMEM;
565
566 data->seq_server = dst_server;
567 data->args.osa_src_fh = NFS_FH(file_inode(dst));
568 memcpy(&data->args.osa_stateid, stateid,
569 sizeof(data->args.osa_stateid));
570 msg.rpc_argp = &data->args;
571 msg.rpc_resp = &data->res;
572 task_setup_data.callback_data = data;
573 nfs4_init_sequence(&data->args.osa_seq_args, &data->res.osr_seq_res,
574 1, 0);
575 task = rpc_run_task(&task_setup_data);
576 if (IS_ERR(task))
577 return PTR_ERR(task);
578 status = rpc_wait_for_completion_task(task);
579 if (status == -ENOTSUPP)
580 dst_server->caps &= ~NFS_CAP_OFFLOAD_CANCEL;
581 rpc_put_task(task);
582 return status;
583 }
584
585 static int _nfs42_proc_copy_notify(struct file *src, struct file *dst,
586 struct nfs42_copy_notify_args *args,
587 struct nfs42_copy_notify_res *res)
588 {
589 struct nfs_server *src_server = NFS_SERVER(file_inode(src));
590 struct rpc_message msg = {
591 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY_NOTIFY],
592 .rpc_argp = args,
593 .rpc_resp = res,
594 };
595 int status;
596 struct nfs_open_context *ctx;
597 struct nfs_lock_context *l_ctx;
598
599 ctx = get_nfs_open_context(nfs_file_open_context(src));
600 l_ctx = nfs_get_lock_context(ctx);
601 if (IS_ERR(l_ctx)) {
602 status = PTR_ERR(l_ctx);
603 goto out;
604 }
605
606 status = nfs4_set_rw_stateid(&args->cna_src_stateid, ctx, l_ctx,
607 FMODE_READ);
608 nfs_put_lock_context(l_ctx);
609 if (status) {
610 if (status == -EAGAIN)
611 status = -NFS4ERR_BAD_STATEID;
612 goto out;
613 }
614
615 status = nfs4_call_sync(src_server->client, src_server, &msg,
616 &args->cna_seq_args, &res->cnr_seq_res, 0);
617 trace_nfs4_copy_notify(file_inode(src), args, res, status);
618 if (status == -ENOTSUPP)
619 src_server->caps &= ~NFS_CAP_COPY_NOTIFY;
620
621 out:
622 put_nfs_open_context(nfs_file_open_context(src));
623 return status;
624 }
625
626 int nfs42_proc_copy_notify(struct file *src, struct file *dst,
627 struct nfs42_copy_notify_res *res)
628 {
629 struct nfs_server *src_server = NFS_SERVER(file_inode(src));
630 struct nfs42_copy_notify_args *args;
631 struct nfs4_exception exception = {
632 .inode = file_inode(src),
633 };
634 int status;
635
636 if (!(src_server->caps & NFS_CAP_COPY_NOTIFY))
637 return -EOPNOTSUPP;
638
639 args = kzalloc(sizeof(struct nfs42_copy_notify_args), GFP_KERNEL);
640 if (args == NULL)
641 return -ENOMEM;
642
643 args->cna_src_fh = NFS_FH(file_inode(src)),
644 args->cna_dst.nl4_type = NL4_NETADDR;
645 nfs42_set_netaddr(dst, &args->cna_dst.u.nl4_addr);
646 exception.stateid = &args->cna_src_stateid;
647
648 do {
649 status = _nfs42_proc_copy_notify(src, dst, args, res);
650 if (status == -ENOTSUPP) {
651 status = -EOPNOTSUPP;
652 goto out;
653 }
654 status = nfs4_handle_exception(src_server, status, &exception);
655 } while (exception.retry);
656
657 out:
658 kfree(args);
659 return status;
660 }
661
662 static loff_t _nfs42_proc_llseek(struct file *filep,
663 struct nfs_lock_context *lock, loff_t offset, int whence)
664 {
665 struct inode *inode = file_inode(filep);
666 struct nfs42_seek_args args = {
667 .sa_fh = NFS_FH(inode),
668 .sa_offset = offset,
669 .sa_what = (whence == SEEK_HOLE) ?
670 NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
671 };
672 struct nfs42_seek_res res;
673 struct rpc_message msg = {
674 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
675 .rpc_argp = &args,
676 .rpc_resp = &res,
677 };
678 struct nfs_server *server = NFS_SERVER(inode);
679 int status;
680
681 if (!nfs_server_capable(inode, NFS_CAP_SEEK))
682 return -ENOTSUPP;
683
684 status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
685 lock, FMODE_READ);
686 if (status) {
687 if (status == -EAGAIN)
688 status = -NFS4ERR_BAD_STATEID;
689 return status;
690 }
691
692 status = nfs_filemap_write_and_wait_range(inode->i_mapping,
693 offset, LLONG_MAX);
694 if (status)
695 return status;
696
697 status = nfs4_call_sync(server->client, server, &msg,
698 &args.seq_args, &res.seq_res, 0);
699 trace_nfs4_llseek(inode, &args, &res, status);
700 if (status == -ENOTSUPP)
701 server->caps &= ~NFS_CAP_SEEK;
702 if (status)
703 return status;
704
705 if (whence == SEEK_DATA && res.sr_eof)
706 return -NFS4ERR_NXIO;
707 else
708 return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
709 }
710
711 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
712 {
713 struct nfs_server *server = NFS_SERVER(file_inode(filep));
714 struct nfs4_exception exception = { };
715 struct nfs_lock_context *lock;
716 loff_t err;
717
718 lock = nfs_get_lock_context(nfs_file_open_context(filep));
719 if (IS_ERR(lock))
720 return PTR_ERR(lock);
721
722 exception.inode = file_inode(filep);
723 exception.state = lock->open_context->state;
724
725 do {
726 err = _nfs42_proc_llseek(filep, lock, offset, whence);
727 if (err >= 0)
728 break;
729 if (err == -ENOTSUPP) {
730 err = -EOPNOTSUPP;
731 break;
732 }
733 err = nfs4_handle_exception(server, err, &exception);
734 } while (exception.retry);
735
736 nfs_put_lock_context(lock);
737 return err;
738 }
739
740
741 static void
742 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
743 {
744 struct nfs42_layoutstat_data *data = calldata;
745 struct inode *inode = data->inode;
746 struct nfs_server *server = NFS_SERVER(inode);
747 struct pnfs_layout_hdr *lo;
748
749 spin_lock(&inode->i_lock);
750 lo = NFS_I(inode)->layout;
751 if (!pnfs_layout_is_valid(lo)) {
752 spin_unlock(&inode->i_lock);
753 rpc_exit(task, 0);
754 return;
755 }
756 nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
757 spin_unlock(&inode->i_lock);
758 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
759 &data->res.seq_res, task);
760 }
761
762 static void
763 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
764 {
765 struct nfs42_layoutstat_data *data = calldata;
766 struct inode *inode = data->inode;
767 struct pnfs_layout_hdr *lo;
768
769 if (!nfs4_sequence_done(task, &data->res.seq_res))
770 return;
771
772 switch (task->tk_status) {
773 case 0:
774 return;
775 case -NFS4ERR_BADHANDLE:
776 case -ESTALE:
777 pnfs_destroy_layout(NFS_I(inode));
778 break;
779 case -NFS4ERR_EXPIRED:
780 case -NFS4ERR_ADMIN_REVOKED:
781 case -NFS4ERR_DELEG_REVOKED:
782 case -NFS4ERR_STALE_STATEID:
783 case -NFS4ERR_BAD_STATEID:
784 spin_lock(&inode->i_lock);
785 lo = NFS_I(inode)->layout;
786 if (pnfs_layout_is_valid(lo) &&
787 nfs4_stateid_match(&data->args.stateid,
788 &lo->plh_stateid)) {
789 LIST_HEAD(head);
790
791 /*
792 * Mark the bad layout state as invalid, then retry
793 * with the current stateid.
794 */
795 pnfs_mark_layout_stateid_invalid(lo, &head);
796 spin_unlock(&inode->i_lock);
797 pnfs_free_lseg_list(&head);
798 nfs_commit_inode(inode, 0);
799 } else
800 spin_unlock(&inode->i_lock);
801 break;
802 case -NFS4ERR_OLD_STATEID:
803 spin_lock(&inode->i_lock);
804 lo = NFS_I(inode)->layout;
805 if (pnfs_layout_is_valid(lo) &&
806 nfs4_stateid_match_other(&data->args.stateid,
807 &lo->plh_stateid)) {
808 /* Do we need to delay before resending? */
809 if (!nfs4_stateid_is_newer(&lo->plh_stateid,
810 &data->args.stateid))
811 rpc_delay(task, HZ);
812 rpc_restart_call_prepare(task);
813 }
814 spin_unlock(&inode->i_lock);
815 break;
816 case -ENOTSUPP:
817 case -EOPNOTSUPP:
818 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
819 }
820
821 trace_nfs4_layoutstats(inode, &data->args.stateid, task->tk_status);
822 }
823
824 static void
825 nfs42_layoutstat_release(void *calldata)
826 {
827 struct nfs42_layoutstat_data *data = calldata;
828 struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
829 int i;
830
831 for (i = 0; i < data->args.num_dev; i++) {
832 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
833 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
834 }
835
836 pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
837 smp_mb__before_atomic();
838 clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
839 smp_mb__after_atomic();
840 nfs_iput_and_deactive(data->inode);
841 kfree(data->args.devinfo);
842 kfree(data);
843 }
844
845 static const struct rpc_call_ops nfs42_layoutstat_ops = {
846 .rpc_call_prepare = nfs42_layoutstat_prepare,
847 .rpc_call_done = nfs42_layoutstat_done,
848 .rpc_release = nfs42_layoutstat_release,
849 };
850
851 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
852 struct nfs42_layoutstat_data *data)
853 {
854 struct rpc_message msg = {
855 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
856 .rpc_argp = &data->args,
857 .rpc_resp = &data->res,
858 };
859 struct rpc_task_setup task_setup = {
860 .rpc_client = server->client,
861 .rpc_message = &msg,
862 .callback_ops = &nfs42_layoutstat_ops,
863 .callback_data = data,
864 .flags = RPC_TASK_ASYNC,
865 };
866 struct rpc_task *task;
867
868 data->inode = nfs_igrab_and_active(data->args.inode);
869 if (!data->inode) {
870 nfs42_layoutstat_release(data);
871 return -EAGAIN;
872 }
873 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
874 task = rpc_run_task(&task_setup);
875 if (IS_ERR(task))
876 return PTR_ERR(task);
877 rpc_put_task(task);
878 return 0;
879 }
880
881 static struct nfs42_layouterror_data *
882 nfs42_alloc_layouterror_data(struct pnfs_layout_segment *lseg, gfp_t gfp_flags)
883 {
884 struct nfs42_layouterror_data *data;
885 struct inode *inode = lseg->pls_layout->plh_inode;
886
887 data = kzalloc(sizeof(*data), gfp_flags);
888 if (data) {
889 data->args.inode = data->inode = nfs_igrab_and_active(inode);
890 if (data->inode) {
891 data->lseg = pnfs_get_lseg(lseg);
892 if (data->lseg)
893 return data;
894 nfs_iput_and_deactive(data->inode);
895 }
896 kfree(data);
897 }
898 return NULL;
899 }
900
901 static void
902 nfs42_free_layouterror_data(struct nfs42_layouterror_data *data)
903 {
904 pnfs_put_lseg(data->lseg);
905 nfs_iput_and_deactive(data->inode);
906 kfree(data);
907 }
908
909 static void
910 nfs42_layouterror_prepare(struct rpc_task *task, void *calldata)
911 {
912 struct nfs42_layouterror_data *data = calldata;
913 struct inode *inode = data->inode;
914 struct nfs_server *server = NFS_SERVER(inode);
915 struct pnfs_layout_hdr *lo = data->lseg->pls_layout;
916 unsigned i;
917
918 spin_lock(&inode->i_lock);
919 if (!pnfs_layout_is_valid(lo)) {
920 spin_unlock(&inode->i_lock);
921 rpc_exit(task, 0);
922 return;
923 }
924 for (i = 0; i < data->args.num_errors; i++)
925 nfs4_stateid_copy(&data->args.errors[i].stateid,
926 &lo->plh_stateid);
927 spin_unlock(&inode->i_lock);
928 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
929 &data->res.seq_res, task);
930 }
931
932 static void
933 nfs42_layouterror_done(struct rpc_task *task, void *calldata)
934 {
935 struct nfs42_layouterror_data *data = calldata;
936 struct inode *inode = data->inode;
937 struct pnfs_layout_hdr *lo = data->lseg->pls_layout;
938
939 if (!nfs4_sequence_done(task, &data->res.seq_res))
940 return;
941
942 switch (task->tk_status) {
943 case 0:
944 return;
945 case -NFS4ERR_BADHANDLE:
946 case -ESTALE:
947 pnfs_destroy_layout(NFS_I(inode));
948 break;
949 case -NFS4ERR_EXPIRED:
950 case -NFS4ERR_ADMIN_REVOKED:
951 case -NFS4ERR_DELEG_REVOKED:
952 case -NFS4ERR_STALE_STATEID:
953 case -NFS4ERR_BAD_STATEID:
954 spin_lock(&inode->i_lock);
955 if (pnfs_layout_is_valid(lo) &&
956 nfs4_stateid_match(&data->args.errors[0].stateid,
957 &lo->plh_stateid)) {
958 LIST_HEAD(head);
959
960 /*
961 * Mark the bad layout state as invalid, then retry
962 * with the current stateid.
963 */
964 pnfs_mark_layout_stateid_invalid(lo, &head);
965 spin_unlock(&inode->i_lock);
966 pnfs_free_lseg_list(&head);
967 nfs_commit_inode(inode, 0);
968 } else
969 spin_unlock(&inode->i_lock);
970 break;
971 case -NFS4ERR_OLD_STATEID:
972 spin_lock(&inode->i_lock);
973 if (pnfs_layout_is_valid(lo) &&
974 nfs4_stateid_match_other(&data->args.errors[0].stateid,
975 &lo->plh_stateid)) {
976 /* Do we need to delay before resending? */
977 if (!nfs4_stateid_is_newer(&lo->plh_stateid,
978 &data->args.errors[0].stateid))
979 rpc_delay(task, HZ);
980 rpc_restart_call_prepare(task);
981 }
982 spin_unlock(&inode->i_lock);
983 break;
984 case -ENOTSUPP:
985 case -EOPNOTSUPP:
986 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTERROR;
987 }
988
989 trace_nfs4_layouterror(inode, &data->args.errors[0].stateid,
990 task->tk_status);
991 }
992
993 static void
994 nfs42_layouterror_release(void *calldata)
995 {
996 struct nfs42_layouterror_data *data = calldata;
997
998 nfs42_free_layouterror_data(data);
999 }
1000
1001 static const struct rpc_call_ops nfs42_layouterror_ops = {
1002 .rpc_call_prepare = nfs42_layouterror_prepare,
1003 .rpc_call_done = nfs42_layouterror_done,
1004 .rpc_release = nfs42_layouterror_release,
1005 };
1006
1007 int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
1008 const struct nfs42_layout_error *errors, size_t n)
1009 {
1010 struct inode *inode = lseg->pls_layout->plh_inode;
1011 struct nfs42_layouterror_data *data;
1012 struct rpc_task *task;
1013 struct rpc_message msg = {
1014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTERROR],
1015 };
1016 struct rpc_task_setup task_setup = {
1017 .rpc_message = &msg,
1018 .callback_ops = &nfs42_layouterror_ops,
1019 .flags = RPC_TASK_ASYNC,
1020 };
1021 unsigned int i;
1022
1023 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTERROR))
1024 return -EOPNOTSUPP;
1025 if (n > NFS42_LAYOUTERROR_MAX)
1026 return -EINVAL;
1027 data = nfs42_alloc_layouterror_data(lseg, nfs_io_gfp_mask());
1028 if (!data)
1029 return -ENOMEM;
1030 for (i = 0; i < n; i++) {
1031 data->args.errors[i] = errors[i];
1032 data->args.num_errors++;
1033 data->res.num_errors++;
1034 }
1035 msg.rpc_argp = &data->args;
1036 msg.rpc_resp = &data->res;
1037 task_setup.callback_data = data;
1038 task_setup.rpc_client = NFS_SERVER(inode)->client;
1039 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
1040 task = rpc_run_task(&task_setup);
1041 if (IS_ERR(task))
1042 return PTR_ERR(task);
1043 rpc_put_task(task);
1044 return 0;
1045 }
1046 EXPORT_SYMBOL_GPL(nfs42_proc_layouterror);
1047
1048 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
1049 struct file *dst_f, struct nfs_lock_context *src_lock,
1050 struct nfs_lock_context *dst_lock, loff_t src_offset,
1051 loff_t dst_offset, loff_t count)
1052 {
1053 struct inode *src_inode = file_inode(src_f);
1054 struct inode *dst_inode = file_inode(dst_f);
1055 struct nfs_server *server = NFS_SERVER(dst_inode);
1056 __u32 dst_bitmask[NFS_BITMASK_SZ];
1057 struct nfs42_clone_args args = {
1058 .src_fh = NFS_FH(src_inode),
1059 .dst_fh = NFS_FH(dst_inode),
1060 .src_offset = src_offset,
1061 .dst_offset = dst_offset,
1062 .count = count,
1063 .dst_bitmask = dst_bitmask,
1064 };
1065 struct nfs42_clone_res res = {
1066 .server = server,
1067 };
1068 int status;
1069
1070 msg->rpc_argp = &args;
1071 msg->rpc_resp = &res;
1072
1073 status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
1074 src_lock, FMODE_READ);
1075 if (status) {
1076 if (status == -EAGAIN)
1077 status = -NFS4ERR_BAD_STATEID;
1078 return status;
1079 }
1080 status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
1081 dst_lock, FMODE_WRITE);
1082 if (status) {
1083 if (status == -EAGAIN)
1084 status = -NFS4ERR_BAD_STATEID;
1085 return status;
1086 }
1087
1088 res.dst_fattr = nfs_alloc_fattr();
1089 if (!res.dst_fattr)
1090 return -ENOMEM;
1091
1092 nfs4_bitmask_set(dst_bitmask, server->cache_consistency_bitmask,
1093 dst_inode, NFS_INO_INVALID_BLOCKS);
1094
1095 status = nfs4_call_sync(server->client, server, msg,
1096 &args.seq_args, &res.seq_res, 0);
1097 trace_nfs4_clone(src_inode, dst_inode, &args, status);
1098 if (status == 0) {
1099 /* a zero-length count means clone to EOF in src */
1100 if (count == 0 && res.dst_fattr->valid & NFS_ATTR_FATTR_SIZE)
1101 count = nfs_size_to_loff_t(res.dst_fattr->size) - dst_offset;
1102 nfs42_copy_dest_done(dst_inode, dst_offset, count);
1103 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
1104 }
1105
1106 kfree(res.dst_fattr);
1107 return status;
1108 }
1109
1110 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
1111 loff_t src_offset, loff_t dst_offset, loff_t count)
1112 {
1113 struct rpc_message msg = {
1114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
1115 };
1116 struct inode *inode = file_inode(src_f);
1117 struct nfs_server *server = NFS_SERVER(file_inode(src_f));
1118 struct nfs_lock_context *src_lock;
1119 struct nfs_lock_context *dst_lock;
1120 struct nfs4_exception src_exception = { };
1121 struct nfs4_exception dst_exception = { };
1122 int err, err2;
1123
1124 if (!nfs_server_capable(inode, NFS_CAP_CLONE))
1125 return -EOPNOTSUPP;
1126
1127 src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
1128 if (IS_ERR(src_lock))
1129 return PTR_ERR(src_lock);
1130
1131 src_exception.inode = file_inode(src_f);
1132 src_exception.state = src_lock->open_context->state;
1133
1134 dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
1135 if (IS_ERR(dst_lock)) {
1136 err = PTR_ERR(dst_lock);
1137 goto out_put_src_lock;
1138 }
1139
1140 dst_exception.inode = file_inode(dst_f);
1141 dst_exception.state = dst_lock->open_context->state;
1142
1143 do {
1144 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
1145 src_offset, dst_offset, count);
1146 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
1147 NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
1148 err = -EOPNOTSUPP;
1149 break;
1150 }
1151
1152 err2 = nfs4_handle_exception(server, err, &src_exception);
1153 err = nfs4_handle_exception(server, err, &dst_exception);
1154 if (!err)
1155 err = err2;
1156 } while (src_exception.retry || dst_exception.retry);
1157
1158 nfs_put_lock_context(dst_lock);
1159 out_put_src_lock:
1160 nfs_put_lock_context(src_lock);
1161 return err;
1162 }
1163
1164 #define NFS4XATTR_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
1165
1166 static int _nfs42_proc_removexattr(struct inode *inode, const char *name)
1167 {
1168 struct nfs_server *server = NFS_SERVER(inode);
1169 struct nfs42_removexattrargs args = {
1170 .fh = NFS_FH(inode),
1171 .xattr_name = name,
1172 };
1173 struct nfs42_removexattrres res;
1174 struct rpc_message msg = {
1175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVEXATTR],
1176 .rpc_argp = &args,
1177 .rpc_resp = &res,
1178 };
1179 int ret;
1180 unsigned long timestamp = jiffies;
1181
1182 ret = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
1183 &res.seq_res, 1);
1184 trace_nfs4_removexattr(inode, name, ret);
1185 if (!ret)
1186 nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0);
1187
1188 return ret;
1189 }
1190
1191 static int _nfs42_proc_setxattr(struct inode *inode, const char *name,
1192 const void *buf, size_t buflen, int flags)
1193 {
1194 struct nfs_server *server = NFS_SERVER(inode);
1195 __u32 bitmask[NFS_BITMASK_SZ];
1196 struct page *pages[NFS4XATTR_MAXPAGES];
1197 struct nfs42_setxattrargs arg = {
1198 .fh = NFS_FH(inode),
1199 .bitmask = bitmask,
1200 .xattr_pages = pages,
1201 .xattr_len = buflen,
1202 .xattr_name = name,
1203 .xattr_flags = flags,
1204 };
1205 struct nfs42_setxattrres res = {
1206 .server = server,
1207 };
1208 struct rpc_message msg = {
1209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETXATTR],
1210 .rpc_argp = &arg,
1211 .rpc_resp = &res,
1212 };
1213 int ret, np;
1214 unsigned long timestamp = jiffies;
1215
1216 if (buflen > server->sxasize)
1217 return -ERANGE;
1218
1219 res.fattr = nfs_alloc_fattr();
1220 if (!res.fattr)
1221 return -ENOMEM;
1222
1223 if (buflen > 0) {
1224 np = nfs4_buf_to_pages_noslab(buf, buflen, arg.xattr_pages);
1225 if (np < 0) {
1226 ret = np;
1227 goto out;
1228 }
1229 } else
1230 np = 0;
1231
1232 nfs4_bitmask_set(bitmask, server->cache_consistency_bitmask,
1233 inode, NFS_INO_INVALID_CHANGE);
1234
1235 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
1236 &res.seq_res, 1);
1237 trace_nfs4_setxattr(inode, name, ret);
1238
1239 for (; np > 0; np--)
1240 put_page(pages[np - 1]);
1241
1242 if (!ret) {
1243 nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0);
1244 ret = nfs_post_op_update_inode(inode, res.fattr);
1245 }
1246
1247 out:
1248 kfree(res.fattr);
1249 return ret;
1250 }
1251
1252 static ssize_t _nfs42_proc_getxattr(struct inode *inode, const char *name,
1253 void *buf, size_t buflen, struct page **pages,
1254 size_t plen)
1255 {
1256 struct nfs_server *server = NFS_SERVER(inode);
1257 struct nfs42_getxattrargs arg = {
1258 .fh = NFS_FH(inode),
1259 .xattr_name = name,
1260 };
1261 struct nfs42_getxattrres res;
1262 struct rpc_message msg = {
1263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETXATTR],
1264 .rpc_argp = &arg,
1265 .rpc_resp = &res,
1266 };
1267 ssize_t ret;
1268
1269 arg.xattr_len = plen;
1270 arg.xattr_pages = pages;
1271
1272 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
1273 &res.seq_res, 0);
1274 trace_nfs4_getxattr(inode, name, ret);
1275 if (ret < 0)
1276 return ret;
1277
1278 /*
1279 * Normally, the caching is done one layer up, but for successful
1280 * RPCS, always cache the result here, even if the caller was
1281 * just querying the length, or if the reply was too big for
1282 * the caller. This avoids a second RPC in the case of the
1283 * common query-alloc-retrieve cycle for xattrs.
1284 *
1285 * Note that xattr_len is always capped to XATTR_SIZE_MAX.
1286 */
1287
1288 nfs4_xattr_cache_add(inode, name, NULL, pages, res.xattr_len);
1289
1290 if (buflen) {
1291 if (res.xattr_len > buflen)
1292 return -ERANGE;
1293 _copy_from_pages(buf, pages, 0, res.xattr_len);
1294 }
1295
1296 return res.xattr_len;
1297 }
1298
1299 static ssize_t _nfs42_proc_listxattrs(struct inode *inode, void *buf,
1300 size_t buflen, u64 *cookiep, bool *eofp)
1301 {
1302 struct nfs_server *server = NFS_SERVER(inode);
1303 struct page **pages;
1304 struct nfs42_listxattrsargs arg = {
1305 .fh = NFS_FH(inode),
1306 .cookie = *cookiep,
1307 };
1308 struct nfs42_listxattrsres res = {
1309 .eof = false,
1310 .xattr_buf = buf,
1311 .xattr_len = buflen,
1312 };
1313 struct rpc_message msg = {
1314 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LISTXATTRS],
1315 .rpc_argp = &arg,
1316 .rpc_resp = &res,
1317 };
1318 u32 xdrlen;
1319 int ret, np, i;
1320
1321
1322 ret = -ENOMEM;
1323 res.scratch = alloc_page(GFP_KERNEL);
1324 if (!res.scratch)
1325 goto out;
1326
1327 xdrlen = nfs42_listxattr_xdrsize(buflen);
1328 if (xdrlen > server->lxasize)
1329 xdrlen = server->lxasize;
1330 np = xdrlen / PAGE_SIZE + 1;
1331
1332 pages = kcalloc(np, sizeof(struct page *), GFP_KERNEL);
1333 if (!pages)
1334 goto out_free_scratch;
1335 for (i = 0; i < np; i++) {
1336 pages[i] = alloc_page(GFP_KERNEL);
1337 if (!pages[i])
1338 goto out_free_pages;
1339 }
1340
1341 arg.xattr_pages = pages;
1342 arg.count = xdrlen;
1343
1344 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
1345 &res.seq_res, 0);
1346 trace_nfs4_listxattr(inode, ret);
1347
1348 if (ret >= 0) {
1349 ret = res.copied;
1350 *cookiep = res.cookie;
1351 *eofp = res.eof;
1352 }
1353
1354 out_free_pages:
1355 while (--np >= 0) {
1356 if (pages[np])
1357 __free_page(pages[np]);
1358 }
1359 kfree(pages);
1360 out_free_scratch:
1361 __free_page(res.scratch);
1362 out:
1363 return ret;
1364
1365 }
1366
1367 ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
1368 void *buf, size_t buflen)
1369 {
1370 struct nfs4_exception exception = { };
1371 ssize_t err, np, i;
1372 struct page **pages;
1373
1374 np = nfs_page_array_len(0, buflen ?: XATTR_SIZE_MAX);
1375 pages = kmalloc_array(np, sizeof(*pages), GFP_KERNEL);
1376 if (!pages)
1377 return -ENOMEM;
1378
1379 for (i = 0; i < np; i++) {
1380 pages[i] = alloc_page(GFP_KERNEL);
1381 if (!pages[i]) {
1382 err = -ENOMEM;
1383 goto out;
1384 }
1385 }
1386
1387 /*
1388 * The GETXATTR op has no length field in the call, and the
1389 * xattr data is at the end of the reply.
1390 *
1391 * There is no downside in using the page-aligned length. It will
1392 * allow receiving and caching xattrs that are too large for the
1393 * caller but still fit in the page-rounded value.
1394 */
1395 do {
1396 err = _nfs42_proc_getxattr(inode, name, buf, buflen,
1397 pages, np * PAGE_SIZE);
1398 if (err >= 0)
1399 break;
1400 err = nfs4_handle_exception(NFS_SERVER(inode), err,
1401 &exception);
1402 } while (exception.retry);
1403
1404 out:
1405 while (--i >= 0)
1406 __free_page(pages[i]);
1407 kfree(pages);
1408
1409 return err;
1410 }
1411
1412 int nfs42_proc_setxattr(struct inode *inode, const char *name,
1413 const void *buf, size_t buflen, int flags)
1414 {
1415 struct nfs4_exception exception = { };
1416 int err;
1417
1418 do {
1419 err = _nfs42_proc_setxattr(inode, name, buf, buflen, flags);
1420 if (!err)
1421 break;
1422 err = nfs4_handle_exception(NFS_SERVER(inode), err,
1423 &exception);
1424 } while (exception.retry);
1425
1426 return err;
1427 }
1428
1429 ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
1430 size_t buflen, u64 *cookiep, bool *eofp)
1431 {
1432 struct nfs4_exception exception = { };
1433 ssize_t err;
1434
1435 do {
1436 err = _nfs42_proc_listxattrs(inode, buf, buflen,
1437 cookiep, eofp);
1438 if (err >= 0)
1439 break;
1440 err = nfs4_handle_exception(NFS_SERVER(inode), err,
1441 &exception);
1442 } while (exception.retry);
1443
1444 return err;
1445 }
1446
1447 int nfs42_proc_removexattr(struct inode *inode, const char *name)
1448 {
1449 struct nfs4_exception exception = { };
1450 int err;
1451
1452 do {
1453 err = _nfs42_proc_removexattr(inode, name);
1454 if (!err)
1455 break;
1456 err = nfs4_handle_exception(NFS_SERVER(inode), err,
1457 &exception);
1458 } while (exception.retry);
1459
1460 return err;
1461 }
Linux Kernel