Commit | Line | Data |
---|---|---|
5274f052 JA |
1 | /* |
2 | * "splice": joining two ropes together by interweaving their strands. | |
3 | * | |
4 | * This is the "extended pipe" functionality, where a pipe is used as | |
5 | * an arbitrary in-memory buffer. Think of a pipe as a small kernel | |
6 | * buffer that you can use to transfer data from one end to the other. | |
7 | * | |
8 | * The traditional unix read/write is extended with a "splice()" operation | |
9 | * that transfers data buffers to or from a pipe buffer. | |
10 | * | |
11 | * Named by Larry McVoy, original implementation from Linus, extended by | |
12 | * Jens to support splicing to files and fixing the initial implementation | |
13 | * bugs. | |
14 | * | |
15 | * Copyright (C) 2005 Jens Axboe <axboe@suse.de> | |
16 | * Copyright (C) 2005 Linus Torvalds <torvalds@osdl.org> | |
17 | * | |
18 | */ | |
19 | #include <linux/fs.h> | |
20 | #include <linux/file.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/pipe_fs_i.h> | |
23 | #include <linux/mm_inline.h> | |
5abc97aa | 24 | #include <linux/swap.h> |
5274f052 JA |
25 | |
26 | /* | |
27 | * Passed to the actors | |
28 | */ | |
29 | struct splice_desc { | |
30 | unsigned int len, total_len; /* current and remaining length */ | |
31 | unsigned int flags; /* splice flags */ | |
32 | struct file *file; /* file to read/write */ | |
33 | loff_t pos; /* file position */ | |
34 | }; | |
35 | ||
5abc97aa JA |
36 | static int page_cache_pipe_buf_steal(struct pipe_inode_info *info, |
37 | struct pipe_buffer *buf) | |
38 | { | |
39 | struct page *page = buf->page; | |
40 | ||
41 | WARN_ON(!PageLocked(page)); | |
42 | WARN_ON(!PageUptodate(page)); | |
43 | ||
44 | if (!remove_mapping(page_mapping(page), page)) | |
45 | return 1; | |
46 | ||
47 | if (PageLRU(page)) { | |
48 | struct zone *zone = page_zone(page); | |
49 | ||
50 | spin_lock_irq(&zone->lru_lock); | |
51 | BUG_ON(!PageLRU(page)); | |
52 | __ClearPageLRU(page); | |
53 | del_page_from_lru(zone, page); | |
54 | spin_unlock_irq(&zone->lru_lock); | |
55 | } | |
56 | ||
57 | buf->stolen = 1; | |
58 | return 0; | |
59 | } | |
60 | ||
5274f052 JA |
61 | static void page_cache_pipe_buf_release(struct pipe_inode_info *info, |
62 | struct pipe_buffer *buf) | |
63 | { | |
64 | page_cache_release(buf->page); | |
65 | buf->page = NULL; | |
5abc97aa | 66 | buf->stolen = 0; |
5274f052 JA |
67 | } |
68 | ||
69 | static void *page_cache_pipe_buf_map(struct file *file, | |
70 | struct pipe_inode_info *info, | |
71 | struct pipe_buffer *buf) | |
72 | { | |
73 | struct page *page = buf->page; | |
74 | ||
75 | lock_page(page); | |
76 | ||
77 | if (!PageUptodate(page)) { | |
78 | unlock_page(page); | |
79 | return ERR_PTR(-EIO); | |
80 | } | |
81 | ||
82 | if (!page->mapping) { | |
83 | unlock_page(page); | |
84 | return ERR_PTR(-ENODATA); | |
85 | } | |
86 | ||
87 | return kmap(buf->page); | |
88 | } | |
89 | ||
90 | static void page_cache_pipe_buf_unmap(struct pipe_inode_info *info, | |
91 | struct pipe_buffer *buf) | |
92 | { | |
5abc97aa JA |
93 | if (!buf->stolen) |
94 | unlock_page(buf->page); | |
5274f052 JA |
95 | kunmap(buf->page); |
96 | } | |
97 | ||
98 | static struct pipe_buf_operations page_cache_pipe_buf_ops = { | |
99 | .can_merge = 0, | |
100 | .map = page_cache_pipe_buf_map, | |
101 | .unmap = page_cache_pipe_buf_unmap, | |
102 | .release = page_cache_pipe_buf_release, | |
5abc97aa | 103 | .steal = page_cache_pipe_buf_steal, |
5274f052 JA |
104 | }; |
105 | ||
106 | static ssize_t move_to_pipe(struct inode *inode, struct page **pages, | |
107 | int nr_pages, unsigned long offset, | |
108 | unsigned long len) | |
109 | { | |
110 | struct pipe_inode_info *info; | |
111 | int ret, do_wakeup, i; | |
112 | ||
113 | ret = 0; | |
114 | do_wakeup = 0; | |
115 | i = 0; | |
116 | ||
117 | mutex_lock(PIPE_MUTEX(*inode)); | |
118 | ||
119 | info = inode->i_pipe; | |
120 | for (;;) { | |
121 | int bufs; | |
122 | ||
123 | if (!PIPE_READERS(*inode)) { | |
124 | send_sig(SIGPIPE, current, 0); | |
125 | if (!ret) | |
126 | ret = -EPIPE; | |
127 | break; | |
128 | } | |
129 | ||
130 | bufs = info->nrbufs; | |
131 | if (bufs < PIPE_BUFFERS) { | |
132 | int newbuf = (info->curbuf + bufs) & (PIPE_BUFFERS - 1); | |
133 | struct pipe_buffer *buf = info->bufs + newbuf; | |
134 | struct page *page = pages[i++]; | |
135 | unsigned long this_len; | |
136 | ||
137 | this_len = PAGE_CACHE_SIZE - offset; | |
138 | if (this_len > len) | |
139 | this_len = len; | |
140 | ||
141 | buf->page = page; | |
142 | buf->offset = offset; | |
143 | buf->len = this_len; | |
144 | buf->ops = &page_cache_pipe_buf_ops; | |
145 | info->nrbufs = ++bufs; | |
146 | do_wakeup = 1; | |
147 | ||
148 | ret += this_len; | |
149 | len -= this_len; | |
150 | offset = 0; | |
151 | if (!--nr_pages) | |
152 | break; | |
153 | if (!len) | |
154 | break; | |
155 | if (bufs < PIPE_BUFFERS) | |
156 | continue; | |
157 | ||
158 | break; | |
159 | } | |
160 | ||
161 | if (signal_pending(current)) { | |
162 | if (!ret) | |
163 | ret = -ERESTARTSYS; | |
164 | break; | |
165 | } | |
166 | ||
167 | if (do_wakeup) { | |
168 | wake_up_interruptible_sync(PIPE_WAIT(*inode)); | |
169 | kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, | |
170 | POLL_IN); | |
171 | do_wakeup = 0; | |
172 | } | |
173 | ||
174 | PIPE_WAITING_WRITERS(*inode)++; | |
175 | pipe_wait(inode); | |
176 | PIPE_WAITING_WRITERS(*inode)--; | |
177 | } | |
178 | ||
179 | mutex_unlock(PIPE_MUTEX(*inode)); | |
180 | ||
181 | if (do_wakeup) { | |
182 | wake_up_interruptible(PIPE_WAIT(*inode)); | |
183 | kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN); | |
184 | } | |
185 | ||
186 | while (i < nr_pages) | |
187 | page_cache_release(pages[i++]); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
192 | static int __generic_file_splice_read(struct file *in, struct inode *pipe, | |
193 | size_t len) | |
194 | { | |
195 | struct address_space *mapping = in->f_mapping; | |
196 | unsigned int offset, nr_pages; | |
197 | struct page *pages[PIPE_BUFFERS], *shadow[PIPE_BUFFERS]; | |
198 | struct page *page; | |
199 | pgoff_t index, pidx; | |
200 | int i, j; | |
201 | ||
202 | index = in->f_pos >> PAGE_CACHE_SHIFT; | |
203 | offset = in->f_pos & ~PAGE_CACHE_MASK; | |
204 | nr_pages = (len + offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
205 | ||
206 | if (nr_pages > PIPE_BUFFERS) | |
207 | nr_pages = PIPE_BUFFERS; | |
208 | ||
209 | /* | |
210 | * initiate read-ahead on this page range | |
211 | */ | |
212 | do_page_cache_readahead(mapping, in, index, nr_pages); | |
213 | ||
214 | /* | |
215 | * Get as many pages from the page cache as possible.. | |
216 | * Start IO on the page cache entries we create (we | |
217 | * can assume that any pre-existing ones we find have | |
218 | * already had IO started on them). | |
219 | */ | |
220 | i = find_get_pages(mapping, index, nr_pages, pages); | |
221 | ||
222 | /* | |
223 | * common case - we found all pages and they are contiguous, | |
224 | * kick them off | |
225 | */ | |
226 | if (i && (pages[i - 1]->index == index + i - 1)) | |
227 | goto splice_them; | |
228 | ||
229 | /* | |
230 | * fill shadow[] with pages at the right locations, so we only | |
231 | * have to fill holes | |
232 | */ | |
233 | memset(shadow, 0, i * sizeof(struct page *)); | |
234 | for (j = 0, pidx = index; j < i; pidx++, j++) | |
235 | shadow[pages[j]->index - pidx] = pages[j]; | |
236 | ||
237 | /* | |
238 | * now fill in the holes | |
239 | */ | |
240 | for (i = 0, pidx = index; i < nr_pages; pidx++, i++) { | |
241 | int error; | |
242 | ||
243 | if (shadow[i]) | |
244 | continue; | |
245 | ||
246 | /* | |
247 | * no page there, look one up / create it | |
248 | */ | |
249 | page = find_or_create_page(mapping, pidx, | |
250 | mapping_gfp_mask(mapping)); | |
251 | if (!page) | |
252 | break; | |
253 | ||
254 | if (PageUptodate(page)) | |
255 | unlock_page(page); | |
256 | else { | |
257 | error = mapping->a_ops->readpage(in, page); | |
258 | ||
259 | if (unlikely(error)) { | |
260 | page_cache_release(page); | |
261 | break; | |
262 | } | |
263 | } | |
264 | shadow[i] = page; | |
265 | } | |
266 | ||
267 | if (!i) { | |
268 | for (i = 0; i < nr_pages; i++) { | |
269 | if (shadow[i]) | |
270 | page_cache_release(shadow[i]); | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
275 | memcpy(pages, shadow, i * sizeof(struct page *)); | |
276 | ||
277 | /* | |
278 | * Now we splice them into the pipe.. | |
279 | */ | |
280 | splice_them: | |
281 | return move_to_pipe(pipe, pages, i, offset, len); | |
282 | } | |
283 | ||
284 | ssize_t generic_file_splice_read(struct file *in, struct inode *pipe, | |
285 | size_t len, unsigned int flags) | |
286 | { | |
287 | ssize_t spliced; | |
288 | int ret; | |
289 | ||
290 | ret = 0; | |
291 | spliced = 0; | |
292 | while (len) { | |
293 | ret = __generic_file_splice_read(in, pipe, len); | |
294 | ||
295 | if (ret <= 0) | |
296 | break; | |
297 | ||
298 | in->f_pos += ret; | |
299 | len -= ret; | |
300 | spliced += ret; | |
301 | } | |
302 | ||
303 | if (spliced) | |
304 | return spliced; | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Send 'len' bytes to socket from 'file' at position 'pos' using sendpage(). | |
311 | */ | |
312 | static int pipe_to_sendpage(struct pipe_inode_info *info, | |
313 | struct pipe_buffer *buf, struct splice_desc *sd) | |
314 | { | |
315 | struct file *file = sd->file; | |
316 | loff_t pos = sd->pos; | |
317 | unsigned int offset; | |
318 | ssize_t ret; | |
319 | void *ptr; | |
320 | ||
321 | /* | |
322 | * sub-optimal, but we are limited by the pipe ->map. we don't | |
323 | * need a kmap'ed buffer here, we just want to make sure we | |
324 | * have the page pinned if the pipe page originates from the | |
325 | * page cache | |
326 | */ | |
327 | ptr = buf->ops->map(file, info, buf); | |
328 | if (IS_ERR(ptr)) | |
329 | return PTR_ERR(ptr); | |
330 | ||
331 | offset = pos & ~PAGE_CACHE_MASK; | |
332 | ||
333 | ret = file->f_op->sendpage(file, buf->page, offset, sd->len, &pos, | |
334 | sd->len < sd->total_len); | |
335 | ||
336 | buf->ops->unmap(info, buf); | |
337 | if (ret == sd->len) | |
338 | return 0; | |
339 | ||
340 | return -EIO; | |
341 | } | |
342 | ||
343 | /* | |
344 | * This is a little more tricky than the file -> pipe splicing. There are | |
345 | * basically three cases: | |
346 | * | |
347 | * - Destination page already exists in the address space and there | |
348 | * are users of it. For that case we have no other option that | |
349 | * copying the data. Tough luck. | |
350 | * - Destination page already exists in the address space, but there | |
351 | * are no users of it. Make sure it's uptodate, then drop it. Fall | |
352 | * through to last case. | |
353 | * - Destination page does not exist, we can add the pipe page to | |
354 | * the page cache and avoid the copy. | |
355 | * | |
356 | * For now we just do the slower thing and always copy pages over, it's | |
357 | * easier than migrating pages from the pipe to the target file. For the | |
358 | * case of doing file | file splicing, the migrate approach had some LRU | |
359 | * nastiness... | |
360 | */ | |
361 | static int pipe_to_file(struct pipe_inode_info *info, struct pipe_buffer *buf, | |
362 | struct splice_desc *sd) | |
363 | { | |
364 | struct file *file = sd->file; | |
365 | struct address_space *mapping = file->f_mapping; | |
366 | unsigned int offset; | |
367 | struct page *page; | |
5274f052 | 368 | pgoff_t index; |
5abc97aa | 369 | char *src; |
5274f052 JA |
370 | int ret; |
371 | ||
372 | /* | |
373 | * after this, page will be locked and unmapped | |
374 | */ | |
375 | src = buf->ops->map(file, info, buf); | |
376 | if (IS_ERR(src)) | |
377 | return PTR_ERR(src); | |
378 | ||
379 | index = sd->pos >> PAGE_CACHE_SHIFT; | |
380 | offset = sd->pos & ~PAGE_CACHE_MASK; | |
381 | ||
5274f052 | 382 | /* |
5abc97aa | 383 | * reuse buf page, if SPLICE_F_MOVE is set |
5274f052 | 384 | */ |
5abc97aa JA |
385 | if (sd->flags & SPLICE_F_MOVE) { |
386 | if (buf->ops->steal(info, buf)) | |
387 | goto find_page; | |
388 | ||
389 | page = buf->page; | |
390 | if (add_to_page_cache_lru(page, mapping, index, | |
391 | mapping_gfp_mask(mapping))) | |
392 | goto find_page; | |
393 | } else { | |
394 | find_page: | |
395 | ret = -ENOMEM; | |
396 | page = find_or_create_page(mapping, index, | |
397 | mapping_gfp_mask(mapping)); | |
398 | if (!page) | |
399 | goto out; | |
400 | ||
401 | /* | |
402 | * If the page is uptodate, it is also locked. If it isn't | |
403 | * uptodate, we can mark it uptodate if we are filling the | |
404 | * full page. Otherwise we need to read it in first... | |
405 | */ | |
406 | if (!PageUptodate(page)) { | |
407 | if (sd->len < PAGE_CACHE_SIZE) { | |
408 | ret = mapping->a_ops->readpage(file, page); | |
409 | if (unlikely(ret)) | |
410 | goto out; | |
411 | ||
412 | lock_page(page); | |
413 | ||
414 | if (!PageUptodate(page)) { | |
415 | /* | |
416 | * page got invalidated, repeat | |
417 | */ | |
418 | if (!page->mapping) { | |
419 | unlock_page(page); | |
420 | page_cache_release(page); | |
421 | goto find_page; | |
422 | } | |
423 | ret = -EIO; | |
424 | goto out; | |
5274f052 | 425 | } |
5abc97aa JA |
426 | } else { |
427 | WARN_ON(!PageLocked(page)); | |
428 | SetPageUptodate(page); | |
5274f052 | 429 | } |
5274f052 JA |
430 | } |
431 | } | |
432 | ||
433 | ret = mapping->a_ops->prepare_write(file, page, 0, sd->len); | |
434 | if (ret) | |
435 | goto out; | |
436 | ||
5abc97aa JA |
437 | if (!buf->stolen) { |
438 | char *dst = kmap_atomic(page, KM_USER0); | |
439 | ||
440 | memcpy(dst + offset, src + buf->offset, sd->len); | |
441 | flush_dcache_page(page); | |
442 | kunmap_atomic(dst, KM_USER0); | |
443 | } | |
5274f052 JA |
444 | |
445 | ret = mapping->a_ops->commit_write(file, page, 0, sd->len); | |
446 | if (ret < 0) | |
447 | goto out; | |
448 | ||
449 | set_page_dirty(page); | |
450 | ret = write_one_page(page, 0); | |
451 | out: | |
452 | if (ret < 0) | |
453 | unlock_page(page); | |
5abc97aa JA |
454 | if (!buf->stolen) |
455 | page_cache_release(page); | |
5274f052 JA |
456 | buf->ops->unmap(info, buf); |
457 | return ret; | |
458 | } | |
459 | ||
460 | typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, | |
461 | struct splice_desc *); | |
462 | ||
463 | static ssize_t move_from_pipe(struct inode *inode, struct file *out, | |
464 | size_t len, unsigned int flags, | |
465 | splice_actor *actor) | |
466 | { | |
467 | struct pipe_inode_info *info; | |
468 | int ret, do_wakeup, err; | |
469 | struct splice_desc sd; | |
470 | ||
471 | ret = 0; | |
472 | do_wakeup = 0; | |
473 | ||
474 | sd.total_len = len; | |
475 | sd.flags = flags; | |
476 | sd.file = out; | |
477 | sd.pos = out->f_pos; | |
478 | ||
479 | mutex_lock(PIPE_MUTEX(*inode)); | |
480 | ||
481 | info = inode->i_pipe; | |
482 | for (;;) { | |
483 | int bufs = info->nrbufs; | |
484 | ||
485 | if (bufs) { | |
486 | int curbuf = info->curbuf; | |
487 | struct pipe_buffer *buf = info->bufs + curbuf; | |
488 | struct pipe_buf_operations *ops = buf->ops; | |
489 | ||
490 | sd.len = buf->len; | |
491 | if (sd.len > sd.total_len) | |
492 | sd.len = sd.total_len; | |
493 | ||
494 | err = actor(info, buf, &sd); | |
495 | if (err) { | |
496 | if (!ret && err != -ENODATA) | |
497 | ret = err; | |
498 | ||
499 | break; | |
500 | } | |
501 | ||
502 | ret += sd.len; | |
503 | buf->offset += sd.len; | |
504 | buf->len -= sd.len; | |
505 | if (!buf->len) { | |
506 | buf->ops = NULL; | |
507 | ops->release(info, buf); | |
508 | curbuf = (curbuf + 1) & (PIPE_BUFFERS - 1); | |
509 | info->curbuf = curbuf; | |
510 | info->nrbufs = --bufs; | |
511 | do_wakeup = 1; | |
512 | } | |
513 | ||
514 | sd.pos += sd.len; | |
515 | sd.total_len -= sd.len; | |
516 | if (!sd.total_len) | |
517 | break; | |
518 | } | |
519 | ||
520 | if (bufs) | |
521 | continue; | |
522 | if (!PIPE_WRITERS(*inode)) | |
523 | break; | |
524 | if (!PIPE_WAITING_WRITERS(*inode)) { | |
525 | if (ret) | |
526 | break; | |
527 | } | |
528 | ||
529 | if (signal_pending(current)) { | |
530 | if (!ret) | |
531 | ret = -ERESTARTSYS; | |
532 | break; | |
533 | } | |
534 | ||
535 | if (do_wakeup) { | |
536 | wake_up_interruptible_sync(PIPE_WAIT(*inode)); | |
537 | kill_fasync(PIPE_FASYNC_WRITERS(*inode),SIGIO,POLL_OUT); | |
538 | do_wakeup = 0; | |
539 | } | |
540 | ||
541 | pipe_wait(inode); | |
542 | } | |
543 | ||
544 | mutex_unlock(PIPE_MUTEX(*inode)); | |
545 | ||
546 | if (do_wakeup) { | |
547 | wake_up_interruptible(PIPE_WAIT(*inode)); | |
548 | kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT); | |
549 | } | |
550 | ||
551 | mutex_lock(&out->f_mapping->host->i_mutex); | |
552 | out->f_pos = sd.pos; | |
553 | mutex_unlock(&out->f_mapping->host->i_mutex); | |
554 | return ret; | |
555 | ||
556 | } | |
557 | ||
558 | ssize_t generic_file_splice_write(struct inode *inode, struct file *out, | |
559 | size_t len, unsigned int flags) | |
560 | { | |
561 | return move_from_pipe(inode, out, len, flags, pipe_to_file); | |
562 | } | |
563 | ||
564 | ssize_t generic_splice_sendpage(struct inode *inode, struct file *out, | |
565 | size_t len, unsigned int flags) | |
566 | { | |
567 | return move_from_pipe(inode, out, len, flags, pipe_to_sendpage); | |
568 | } | |
569 | ||
570 | static long do_splice_from(struct inode *pipe, struct file *out, size_t len, | |
571 | unsigned int flags) | |
572 | { | |
573 | loff_t pos; | |
574 | int ret; | |
575 | ||
576 | if (!out->f_op || !out->f_op->splice_write) | |
577 | return -EINVAL; | |
578 | ||
579 | if (!(out->f_mode & FMODE_WRITE)) | |
580 | return -EBADF; | |
581 | ||
582 | pos = out->f_pos; | |
583 | ret = rw_verify_area(WRITE, out, &pos, len); | |
584 | if (unlikely(ret < 0)) | |
585 | return ret; | |
586 | ||
587 | return out->f_op->splice_write(pipe, out, len, flags); | |
588 | } | |
589 | ||
590 | static long do_splice_to(struct file *in, struct inode *pipe, size_t len, | |
591 | unsigned int flags) | |
592 | { | |
593 | loff_t pos, isize, left; | |
594 | int ret; | |
595 | ||
596 | if (!in->f_op || !in->f_op->splice_read) | |
597 | return -EINVAL; | |
598 | ||
599 | if (!(in->f_mode & FMODE_READ)) | |
600 | return -EBADF; | |
601 | ||
602 | pos = in->f_pos; | |
603 | ret = rw_verify_area(READ, in, &pos, len); | |
604 | if (unlikely(ret < 0)) | |
605 | return ret; | |
606 | ||
607 | isize = i_size_read(in->f_mapping->host); | |
608 | if (unlikely(in->f_pos >= isize)) | |
609 | return 0; | |
610 | ||
611 | left = isize - in->f_pos; | |
612 | if (left < len) | |
613 | len = left; | |
614 | ||
615 | return in->f_op->splice_read(in, pipe, len, flags); | |
616 | } | |
617 | ||
618 | static long do_splice(struct file *in, struct file *out, size_t len, | |
619 | unsigned int flags) | |
620 | { | |
621 | struct inode *pipe; | |
622 | ||
623 | pipe = in->f_dentry->d_inode; | |
624 | if (pipe->i_pipe) | |
625 | return do_splice_from(pipe, out, len, flags); | |
626 | ||
627 | pipe = out->f_dentry->d_inode; | |
628 | if (pipe->i_pipe) | |
629 | return do_splice_to(in, pipe, len, flags); | |
630 | ||
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | asmlinkage long sys_splice(int fdin, int fdout, size_t len, unsigned int flags) | |
635 | { | |
636 | long error; | |
637 | struct file *in, *out; | |
638 | int fput_in, fput_out; | |
639 | ||
640 | if (unlikely(!len)) | |
641 | return 0; | |
642 | ||
643 | error = -EBADF; | |
644 | in = fget_light(fdin, &fput_in); | |
645 | if (in) { | |
646 | if (in->f_mode & FMODE_READ) { | |
647 | out = fget_light(fdout, &fput_out); | |
648 | if (out) { | |
649 | if (out->f_mode & FMODE_WRITE) | |
650 | error = do_splice(in, out, len, flags); | |
651 | fput_light(out, fput_out); | |
652 | } | |
653 | } | |
654 | ||
655 | fput_light(in, fput_in); | |
656 | } | |
657 | ||
658 | return error; | |
659 | } |