xref: /openbmc/linux/fs/nfs/nfs42proc.c (revision 6aa7de05)
1 /*
2  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
3  */
4 #include <linux/fs.h>
5 #include <linux/sunrpc/sched.h>
6 #include <linux/nfs.h>
7 #include <linux/nfs3.h>
8 #include <linux/nfs4.h>
9 #include <linux/nfs_xdr.h>
10 #include <linux/nfs_fs.h>
11 #include "nfs4_fs.h"
12 #include "nfs42.h"
13 #include "iostat.h"
14 #include "pnfs.h"
15 #include "nfs4session.h"
16 #include "internal.h"
17 
18 #define NFSDBG_FACILITY NFSDBG_PROC
19 
20 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
21 		struct nfs_lock_context *lock, loff_t offset, loff_t len)
22 {
23 	struct inode *inode = file_inode(filep);
24 	struct nfs_server *server = NFS_SERVER(inode);
25 	struct nfs42_falloc_args args = {
26 		.falloc_fh	= NFS_FH(inode),
27 		.falloc_offset	= offset,
28 		.falloc_length	= len,
29 		.falloc_bitmask	= server->cache_consistency_bitmask,
30 	};
31 	struct nfs42_falloc_res res = {
32 		.falloc_server	= server,
33 	};
34 	int status;
35 
36 	msg->rpc_argp = &args;
37 	msg->rpc_resp = &res;
38 
39 	status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
40 			lock, FMODE_WRITE);
41 	if (status)
42 		return status;
43 
44 	res.falloc_fattr = nfs_alloc_fattr();
45 	if (!res.falloc_fattr)
46 		return -ENOMEM;
47 
48 	status = nfs4_call_sync(server->client, server, msg,
49 				&args.seq_args, &res.seq_res, 0);
50 	if (status == 0)
51 		status = nfs_post_op_update_inode(inode, res.falloc_fattr);
52 
53 	kfree(res.falloc_fattr);
54 	return status;
55 }
56 
57 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
58 				loff_t offset, loff_t len)
59 {
60 	struct nfs_server *server = NFS_SERVER(file_inode(filep));
61 	struct nfs4_exception exception = { };
62 	struct nfs_lock_context *lock;
63 	int err;
64 
65 	lock = nfs_get_lock_context(nfs_file_open_context(filep));
66 	if (IS_ERR(lock))
67 		return PTR_ERR(lock);
68 
69 	exception.inode = file_inode(filep);
70 	exception.state = lock->open_context->state;
71 
72 	do {
73 		err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
74 		if (err == -ENOTSUPP) {
75 			err = -EOPNOTSUPP;
76 			break;
77 		}
78 		err = nfs4_handle_exception(server, err, &exception);
79 	} while (exception.retry);
80 
81 	nfs_put_lock_context(lock);
82 	return err;
83 }
84 
85 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
86 {
87 	struct rpc_message msg = {
88 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
89 	};
90 	struct inode *inode = file_inode(filep);
91 	int err;
92 
93 	if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
94 		return -EOPNOTSUPP;
95 
96 	inode_lock(inode);
97 
98 	err = nfs42_proc_fallocate(&msg, filep, offset, len);
99 	if (err == -EOPNOTSUPP)
100 		NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
101 
102 	inode_unlock(inode);
103 	return err;
104 }
105 
106 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
107 {
108 	struct rpc_message msg = {
109 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
110 	};
111 	struct inode *inode = file_inode(filep);
112 	int err;
113 
114 	if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
115 		return -EOPNOTSUPP;
116 
117 	inode_lock(inode);
118 	err = nfs_sync_inode(inode);
119 	if (err)
120 		goto out_unlock;
121 
122 	err = nfs42_proc_fallocate(&msg, filep, offset, len);
123 	if (err == 0)
124 		truncate_pagecache_range(inode, offset, (offset + len) -1);
125 	if (err == -EOPNOTSUPP)
126 		NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
127 out_unlock:
128 	inode_unlock(inode);
129 	return err;
130 }
131 
132 static ssize_t _nfs42_proc_copy(struct file *src,
133 				struct nfs_lock_context *src_lock,
134 				struct file *dst,
135 				struct nfs_lock_context *dst_lock,
136 				struct nfs42_copy_args *args,
137 				struct nfs42_copy_res *res)
138 {
139 	struct rpc_message msg = {
140 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
141 		.rpc_argp = args,
142 		.rpc_resp = res,
143 	};
144 	struct inode *dst_inode = file_inode(dst);
145 	struct nfs_server *server = NFS_SERVER(dst_inode);
146 	loff_t pos_src = args->src_pos;
147 	loff_t pos_dst = args->dst_pos;
148 	size_t count = args->count;
149 	ssize_t status;
150 
151 	status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
152 				     src_lock, FMODE_READ);
153 	if (status)
154 		return status;
155 
156 	status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
157 			pos_src, pos_src + (loff_t)count - 1);
158 	if (status)
159 		return status;
160 
161 	status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
162 				     dst_lock, FMODE_WRITE);
163 	if (status)
164 		return status;
165 
166 	status = nfs_sync_inode(dst_inode);
167 	if (status)
168 		return status;
169 
170 	res->commit_res.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
171 	if (!res->commit_res.verf)
172 		return -ENOMEM;
173 	status = nfs4_call_sync(server->client, server, &msg,
174 				&args->seq_args, &res->seq_res, 0);
175 	if (status == -ENOTSUPP)
176 		server->caps &= ~NFS_CAP_COPY;
177 	if (status)
178 		goto out;
179 
180 	if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
181 				    &res->commit_res.verf->verifier)) {
182 		status = -EAGAIN;
183 		goto out;
184 	}
185 
186 	truncate_pagecache_range(dst_inode, pos_dst,
187 				 pos_dst + res->write_res.count);
188 
189 	status = res->write_res.count;
190 out:
191 	kfree(res->commit_res.verf);
192 	return status;
193 }
194 
195 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
196 			struct file *dst, loff_t pos_dst,
197 			size_t count)
198 {
199 	struct nfs_server *server = NFS_SERVER(file_inode(dst));
200 	struct nfs_lock_context *src_lock;
201 	struct nfs_lock_context *dst_lock;
202 	struct nfs42_copy_args args = {
203 		.src_fh		= NFS_FH(file_inode(src)),
204 		.src_pos	= pos_src,
205 		.dst_fh		= NFS_FH(file_inode(dst)),
206 		.dst_pos	= pos_dst,
207 		.count		= count,
208 	};
209 	struct nfs42_copy_res res;
210 	struct nfs4_exception src_exception = {
211 		.inode		= file_inode(src),
212 		.stateid	= &args.src_stateid,
213 	};
214 	struct nfs4_exception dst_exception = {
215 		.inode		= file_inode(dst),
216 		.stateid	= &args.dst_stateid,
217 	};
218 	ssize_t err, err2;
219 
220 	if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
221 		return -EOPNOTSUPP;
222 
223 	src_lock = nfs_get_lock_context(nfs_file_open_context(src));
224 	if (IS_ERR(src_lock))
225 		return PTR_ERR(src_lock);
226 
227 	src_exception.state = src_lock->open_context->state;
228 
229 	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
230 	if (IS_ERR(dst_lock)) {
231 		err = PTR_ERR(dst_lock);
232 		goto out_put_src_lock;
233 	}
234 
235 	dst_exception.state = dst_lock->open_context->state;
236 
237 	do {
238 		inode_lock(file_inode(dst));
239 		err = _nfs42_proc_copy(src, src_lock,
240 				dst, dst_lock,
241 				&args, &res);
242 		inode_unlock(file_inode(dst));
243 
244 		if (err >= 0)
245 			break;
246 		if (err == -ENOTSUPP) {
247 			err = -EOPNOTSUPP;
248 			break;
249 		} if (err == -EAGAIN) {
250 			dst_exception.retry = 1;
251 			continue;
252 		}
253 
254 		err2 = nfs4_handle_exception(server, err, &src_exception);
255 		err  = nfs4_handle_exception(server, err, &dst_exception);
256 		if (!err)
257 			err = err2;
258 	} while (src_exception.retry || dst_exception.retry);
259 
260 	nfs_put_lock_context(dst_lock);
261 out_put_src_lock:
262 	nfs_put_lock_context(src_lock);
263 	return err;
264 }
265 
266 static loff_t _nfs42_proc_llseek(struct file *filep,
267 		struct nfs_lock_context *lock, loff_t offset, int whence)
268 {
269 	struct inode *inode = file_inode(filep);
270 	struct nfs42_seek_args args = {
271 		.sa_fh		= NFS_FH(inode),
272 		.sa_offset	= offset,
273 		.sa_what	= (whence == SEEK_HOLE) ?
274 					NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
275 	};
276 	struct nfs42_seek_res res;
277 	struct rpc_message msg = {
278 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
279 		.rpc_argp = &args,
280 		.rpc_resp = &res,
281 	};
282 	struct nfs_server *server = NFS_SERVER(inode);
283 	int status;
284 
285 	if (!nfs_server_capable(inode, NFS_CAP_SEEK))
286 		return -ENOTSUPP;
287 
288 	status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
289 			lock, FMODE_READ);
290 	if (status)
291 		return status;
292 
293 	status = nfs_filemap_write_and_wait_range(inode->i_mapping,
294 			offset, LLONG_MAX);
295 	if (status)
296 		return status;
297 
298 	status = nfs4_call_sync(server->client, server, &msg,
299 				&args.seq_args, &res.seq_res, 0);
300 	if (status == -ENOTSUPP)
301 		server->caps &= ~NFS_CAP_SEEK;
302 	if (status)
303 		return status;
304 
305 	return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
306 }
307 
308 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
309 {
310 	struct nfs_server *server = NFS_SERVER(file_inode(filep));
311 	struct nfs4_exception exception = { };
312 	struct nfs_lock_context *lock;
313 	loff_t err;
314 
315 	lock = nfs_get_lock_context(nfs_file_open_context(filep));
316 	if (IS_ERR(lock))
317 		return PTR_ERR(lock);
318 
319 	exception.inode = file_inode(filep);
320 	exception.state = lock->open_context->state;
321 
322 	do {
323 		err = _nfs42_proc_llseek(filep, lock, offset, whence);
324 		if (err >= 0)
325 			break;
326 		if (err == -ENOTSUPP) {
327 			err = -EOPNOTSUPP;
328 			break;
329 		}
330 		err = nfs4_handle_exception(server, err, &exception);
331 	} while (exception.retry);
332 
333 	nfs_put_lock_context(lock);
334 	return err;
335 }
336 
337 
338 static void
339 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
340 {
341 	struct nfs42_layoutstat_data *data = calldata;
342 	struct inode *inode = data->inode;
343 	struct nfs_server *server = NFS_SERVER(inode);
344 	struct pnfs_layout_hdr *lo;
345 
346 	spin_lock(&inode->i_lock);
347 	lo = NFS_I(inode)->layout;
348 	if (!pnfs_layout_is_valid(lo)) {
349 		spin_unlock(&inode->i_lock);
350 		rpc_exit(task, 0);
351 		return;
352 	}
353 	nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
354 	spin_unlock(&inode->i_lock);
355 	nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
356 			    &data->res.seq_res, task);
357 }
358 
359 static void
360 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
361 {
362 	struct nfs42_layoutstat_data *data = calldata;
363 	struct inode *inode = data->inode;
364 	struct pnfs_layout_hdr *lo;
365 
366 	if (!nfs4_sequence_done(task, &data->res.seq_res))
367 		return;
368 
369 	switch (task->tk_status) {
370 	case 0:
371 		break;
372 	case -NFS4ERR_EXPIRED:
373 	case -NFS4ERR_ADMIN_REVOKED:
374 	case -NFS4ERR_DELEG_REVOKED:
375 	case -NFS4ERR_STALE_STATEID:
376 	case -NFS4ERR_BAD_STATEID:
377 		spin_lock(&inode->i_lock);
378 		lo = NFS_I(inode)->layout;
379 		if (pnfs_layout_is_valid(lo) &&
380 		    nfs4_stateid_match(&data->args.stateid,
381 					     &lo->plh_stateid)) {
382 			LIST_HEAD(head);
383 
384 			/*
385 			 * Mark the bad layout state as invalid, then retry
386 			 * with the current stateid.
387 			 */
388 			pnfs_mark_layout_stateid_invalid(lo, &head);
389 			spin_unlock(&inode->i_lock);
390 			pnfs_free_lseg_list(&head);
391 			nfs_commit_inode(inode, 0);
392 		} else
393 			spin_unlock(&inode->i_lock);
394 		break;
395 	case -NFS4ERR_OLD_STATEID:
396 		spin_lock(&inode->i_lock);
397 		lo = NFS_I(inode)->layout;
398 		if (pnfs_layout_is_valid(lo) &&
399 		    nfs4_stateid_match_other(&data->args.stateid,
400 					&lo->plh_stateid)) {
401 			/* Do we need to delay before resending? */
402 			if (!nfs4_stateid_is_newer(&lo->plh_stateid,
403 						&data->args.stateid))
404 				rpc_delay(task, HZ);
405 			rpc_restart_call_prepare(task);
406 		}
407 		spin_unlock(&inode->i_lock);
408 		break;
409 	case -ENOTSUPP:
410 	case -EOPNOTSUPP:
411 		NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
412 	}
413 }
414 
415 static void
416 nfs42_layoutstat_release(void *calldata)
417 {
418 	struct nfs42_layoutstat_data *data = calldata;
419 	struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
420 	int i;
421 
422 	for (i = 0; i < data->args.num_dev; i++) {
423 		if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
424 			devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
425 	}
426 
427 	pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
428 	smp_mb__before_atomic();
429 	clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
430 	smp_mb__after_atomic();
431 	nfs_iput_and_deactive(data->inode);
432 	kfree(data->args.devinfo);
433 	kfree(data);
434 }
435 
436 static const struct rpc_call_ops nfs42_layoutstat_ops = {
437 	.rpc_call_prepare = nfs42_layoutstat_prepare,
438 	.rpc_call_done = nfs42_layoutstat_done,
439 	.rpc_release = nfs42_layoutstat_release,
440 };
441 
442 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
443 				   struct nfs42_layoutstat_data *data)
444 {
445 	struct rpc_message msg = {
446 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
447 		.rpc_argp = &data->args,
448 		.rpc_resp = &data->res,
449 	};
450 	struct rpc_task_setup task_setup = {
451 		.rpc_client = server->client,
452 		.rpc_message = &msg,
453 		.callback_ops = &nfs42_layoutstat_ops,
454 		.callback_data = data,
455 		.flags = RPC_TASK_ASYNC,
456 	};
457 	struct rpc_task *task;
458 
459 	data->inode = nfs_igrab_and_active(data->args.inode);
460 	if (!data->inode) {
461 		nfs42_layoutstat_release(data);
462 		return -EAGAIN;
463 	}
464 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
465 	task = rpc_run_task(&task_setup);
466 	if (IS_ERR(task))
467 		return PTR_ERR(task);
468 	rpc_put_task(task);
469 	return 0;
470 }
471 
472 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
473 		struct file *dst_f, struct nfs_lock_context *src_lock,
474 		struct nfs_lock_context *dst_lock, loff_t src_offset,
475 		loff_t dst_offset, loff_t count)
476 {
477 	struct inode *src_inode = file_inode(src_f);
478 	struct inode *dst_inode = file_inode(dst_f);
479 	struct nfs_server *server = NFS_SERVER(dst_inode);
480 	struct nfs42_clone_args args = {
481 		.src_fh = NFS_FH(src_inode),
482 		.dst_fh = NFS_FH(dst_inode),
483 		.src_offset = src_offset,
484 		.dst_offset = dst_offset,
485 		.count = count,
486 		.dst_bitmask = server->cache_consistency_bitmask,
487 	};
488 	struct nfs42_clone_res res = {
489 		.server	= server,
490 	};
491 	int status;
492 
493 	msg->rpc_argp = &args;
494 	msg->rpc_resp = &res;
495 
496 	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
497 			src_lock, FMODE_READ);
498 	if (status)
499 		return status;
500 
501 	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
502 			dst_lock, FMODE_WRITE);
503 	if (status)
504 		return status;
505 
506 	res.dst_fattr = nfs_alloc_fattr();
507 	if (!res.dst_fattr)
508 		return -ENOMEM;
509 
510 	status = nfs4_call_sync(server->client, server, msg,
511 				&args.seq_args, &res.seq_res, 0);
512 	if (status == 0)
513 		status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
514 
515 	kfree(res.dst_fattr);
516 	return status;
517 }
518 
519 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
520 		     loff_t src_offset, loff_t dst_offset, loff_t count)
521 {
522 	struct rpc_message msg = {
523 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
524 	};
525 	struct inode *inode = file_inode(src_f);
526 	struct nfs_server *server = NFS_SERVER(file_inode(src_f));
527 	struct nfs_lock_context *src_lock;
528 	struct nfs_lock_context *dst_lock;
529 	struct nfs4_exception src_exception = { };
530 	struct nfs4_exception dst_exception = { };
531 	int err, err2;
532 
533 	if (!nfs_server_capable(inode, NFS_CAP_CLONE))
534 		return -EOPNOTSUPP;
535 
536 	src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
537 	if (IS_ERR(src_lock))
538 		return PTR_ERR(src_lock);
539 
540 	src_exception.inode = file_inode(src_f);
541 	src_exception.state = src_lock->open_context->state;
542 
543 	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
544 	if (IS_ERR(dst_lock)) {
545 		err = PTR_ERR(dst_lock);
546 		goto out_put_src_lock;
547 	}
548 
549 	dst_exception.inode = file_inode(dst_f);
550 	dst_exception.state = dst_lock->open_context->state;
551 
552 	do {
553 		err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
554 					src_offset, dst_offset, count);
555 		if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
556 			NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
557 			err = -EOPNOTSUPP;
558 			break;
559 		}
560 
561 		err2 = nfs4_handle_exception(server, err, &src_exception);
562 		err = nfs4_handle_exception(server, err, &dst_exception);
563 		if (!err)
564 			err = err2;
565 	} while (src_exception.retry || dst_exception.retry);
566 
567 	nfs_put_lock_context(dst_lock);
568 out_put_src_lock:
569 	nfs_put_lock_context(src_lock);
570 	return err;
571 }
572