regops.c@ 69496

Last change on this file since 69496 was 69496, checked in by vboxsync, 7 years ago
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1	/* $Id: regops.c 69496 2017-10-28 14:55:58Z vboxsync $ */
2	/** @file
3	* vboxsf - VBox Linux Shared Folders, Regular file inode and file operations.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*
19	* Limitations: only COW memory mapping is supported
20	*/
21
22	#include "vfsmod.h"
23
24	static void alloc_bounce_buffer(size_t tmp_sizep, PRTCCPHYS physp, size_t
25	xfer_size, const char *caller)
26	{
27	size_t tmp_size;
28	void *tmp;
29
30	/* try for big first. */
31	tmp_size = RT_ALIGN_Z(xfer_size, PAGE_SIZE);
32	if (tmp_size > 16U*_1K)
33	tmp_size = 16U*_1K;
34	tmp = kmalloc(tmp_size, GFP_KERNEL);
35	if (!tmp)
36	{
37	/* fall back on a page sized buffer. */
38	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
39	if (!tmp)
40	{
41	LogRel(("%s: could not allocate bounce buffer for xfer_size=%zu %s\n", caller, xfer_size));
42	return NULL;
43	}
44	tmp_size = PAGE_SIZE;
45	}
46
47	*tmp_sizep = tmp_size;
48	*physp = virt_to_phys(tmp);
49	return tmp;
50	}
51
52	static void free_bounce_buffer(void *tmp)
53	{
54	kfree (tmp);
55	}
56
57
58	/* fops */
59	static int sf_reg_read_aux(const char caller, struct sf_glob_info sf_g,
60	struct sf_reg_info sf_r, void buf,
61	uint32_t *nread, uint64_t pos)
62	{
63	/** @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is
64	* contiguous in physical memory (kmalloc or single page), we should
65	* use a physical address here to speed things up. */
66	int rc = VbglR0SfRead(&client_handle, &sf_g->map, sf_r->handle,
67	pos, nread, buf, false /* already locked? */);
68	if (RT_FAILURE(rc))
69	{
70	LogFunc(("VbglR0SfRead failed. caller=%s, rc=%Rrc\n", caller, rc));
71	return -EPROTO;
72	}
73	return 0;
74	}
75
76	static int sf_reg_write_aux(const char caller, struct sf_glob_info sf_g,
77	struct sf_reg_info sf_r, void buf,
78	uint32_t *nwritten, uint64_t pos)
79	{
80	/** @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is
81	* contiguous in physical memory (kmalloc or single page), we should
82	* use a physical address here to speed things up. */
83	int rc = VbglR0SfWrite(&client_handle, &sf_g->map, sf_r->handle,
84	pos, nwritten, buf, false /* already locked? */);
85	if (RT_FAILURE(rc))
86	{
87	LogFunc(("VbglR0SfWrite failed. caller=%s, rc=%Rrc\n",
88	caller, rc));
89	return -EPROTO;
90	}
91	return 0;
92	}
93
94	/**
95	* Read from a regular file.
96	*
97	* @param file the file
98	* @param buf the buffer
99	* @param size length of the buffer
100	* @param off offset within the file
101	* @returns the number of read bytes on success, Linux error code otherwise
102	*/
103	static ssize_t sf_reg_read(struct file file, char buf, size_t size, loff_t *off)
104	{
105	int err;
106	void *tmp;
107	RTCCPHYS tmp_phys;
108	size_t tmp_size;
109	size_t left = size;
110	ssize_t total_bytes_read = 0;
111	struct inode *inode = GET_F_DENTRY(file)->d_inode;
112	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
113	struct sf_reg_info *sf_r = file->private_data;
114	loff_t pos = *off;
115
116	TRACE();
117	if (!S_ISREG(inode->i_mode))
118	{
119	LogFunc(("read from non regular file %d\n", inode->i_mode));
120	return -EINVAL;
121	}
122
123	/** XXX Check read permission according to inode->i_mode! */
124
125	if (!size)
126	return 0;
127
128	tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size, __PRETTY_FUNCTION__);
129	if (!tmp)
130	return -ENOMEM;
131
132	while (left)
133	{
134	uint32_t to_read, nread;
135
136	to_read = tmp_size;
137	if (to_read > left)
138	to_read = (uint32_t) left;
139
140	nread = to_read;
141
142	err = sf_reg_read_aux(__func__, sf_g, sf_r, tmp, &nread, pos);
143	if (err)
144	goto fail;
145
146	if (copy_to_user(buf, tmp, nread))
147	{
148	err = -EFAULT;
149	goto fail;
150	}
151
152	pos += nread;
153	left -= nread;
154	buf += nread;
155	total_bytes_read += nread;
156	if (nread != to_read)
157	break;
158	}
159
160	*off += total_bytes_read;
161	free_bounce_buffer(tmp);
162	return total_bytes_read;
163
164	fail:
165	free_bounce_buffer(tmp);
166	return err;
167	}
168
169	/**
170	* Write to a regular file.
171	*
172	* @param file the file
173	* @param buf the buffer
174	* @param size length of the buffer
175	* @param off offset within the file
176	* @returns the number of written bytes on success, Linux error code otherwise
177	*/
178	static ssize_t sf_reg_write(struct file file, const char buf, size_t size, loff_t *off)
179	{
180	int err;
181	void *tmp;
182	RTCCPHYS tmp_phys;
183	size_t tmp_size;
184	size_t left = size;
185	ssize_t total_bytes_written = 0;
186	struct inode *inode = GET_F_DENTRY(file)->d_inode;
187	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
188	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
189	struct sf_reg_info *sf_r = file->private_data;
190	loff_t pos;
191
192	TRACE();
193	BUG_ON(!sf_i);
194	BUG_ON(!sf_g);
195	BUG_ON(!sf_r);
196
197	if (!S_ISREG(inode->i_mode))
198	{
199	LogFunc(("write to non regular file %d\n", inode->i_mode));
200	return -EINVAL;
201	}
202
203	pos = *off;
204	if (file->f_flags & O_APPEND)
205	{
206	pos = inode->i_size;
207	*off = pos;
208	}
209
210	/** XXX Check write permission according to inode->i_mode! */
211
212	if (!size)
213	return 0;
214
215	tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size, __PRETTY_FUNCTION__);
216	if (!tmp)
217	return -ENOMEM;
218
219	while (left)
220	{
221	uint32_t to_write, nwritten;
222
223	to_write = tmp_size;
224	if (to_write > left)
225	to_write = (uint32_t) left;
226
227	nwritten = to_write;
228
229	if (copy_from_user(tmp, buf, to_write))
230	{
231	err = -EFAULT;
232	goto fail;
233	}
234
235	err = VbglR0SfWritePhysCont(&client_handle, &sf_g->map, sf_r->handle,
236	pos, &nwritten, tmp_phys);
237	err = RT_FAILURE(err) ? -EPROTO : 0;
238	if (err)
239	goto fail;
240
241	pos += nwritten;
242	left -= nwritten;
243	buf += nwritten;
244	total_bytes_written += nwritten;
245	if (nwritten != to_write)
246	break;
247	}
248
249	*off += total_bytes_written;
250	if (*off > inode->i_size)
251	inode->i_size = *off;
252
253	sf_i->force_restat = 1;
254	free_bounce_buffer(tmp);
255	return total_bytes_written;
256
257	fail:
258	free_bounce_buffer(tmp);
259	return err;
260	}
261
262	/**
263	* Open a regular file.
264	*
265	* @param inode the inode
266	* @param file the file
267	* @returns 0 on success, Linux error code otherwise
268	*/
269	static int sf_reg_open(struct inode inode, struct file file)
270	{
271	int rc, rc_linux = 0;
272	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
273	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
274	struct sf_reg_info *sf_r;
275	SHFLCREATEPARMS params;
276
277	TRACE();
278	BUG_ON(!sf_g);
279	BUG_ON(!sf_i);
280
281	LogFunc(("open %s\n", sf_i->path->String.utf8));
282
283	sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL);
284	if (!sf_r)
285	{
286	LogRelFunc(("could not allocate reg info\n"));
287	return -ENOMEM;
288	}
289
290	/* Already open? */
291	if (sf_i->handle != SHFL_HANDLE_NIL)
292	{
293	/*
294	* This inode was created with sf_create_aux(). Check the CreateFlags:
295	* O_CREAT, O_TRUNC: inherent true (file was just created). Not sure
296	* about the access flags (SHFL_CF_ACCESS_*).
297	*/
298	sf_i->force_restat = 1;
299	sf_r->handle = sf_i->handle;
300	sf_i->handle = SHFL_HANDLE_NIL;
301	sf_i->file = file;
302	file->private_data = sf_r;
303	return 0;
304	}
305
306	RT_ZERO(params);
307	params.Handle = SHFL_HANDLE_NIL;
308	/* We check the value of params.Handle afterwards to find out if
309	* the call succeeded or failed, as the API does not seem to cleanly
310	* distinguish error and informational messages.
311	*
312	* Furthermore, we must set params.Handle to SHFL_HANDLE_NIL to
313	* make the shared folders host service use our fMode parameter */
314
315	if (file->f_flags & O_CREAT)
316	{
317	LogFunc(("O_CREAT set\n"));
318	params.CreateFlags \|= SHFL_CF_ACT_CREATE_IF_NEW;
319	/* We ignore O_EXCL, as the Linux kernel seems to call create
320	beforehand itself, so O_EXCL should always fail. */
321	if (file->f_flags & O_TRUNC)
322	{
323	LogFunc(("O_TRUNC set\n"));
324	params.CreateFlags \|= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
325	}
326	else
327	params.CreateFlags \|= SHFL_CF_ACT_OPEN_IF_EXISTS;
328	}
329	else
330	{
331	params.CreateFlags \|= SHFL_CF_ACT_FAIL_IF_NEW;
332	if (file->f_flags & O_TRUNC)
333	{
334	LogFunc(("O_TRUNC set\n"));
335	params.CreateFlags \|= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
336	}
337	}
338
339	switch (file->f_flags & O_ACCMODE)
340	{
341	case O_RDONLY:
342	params.CreateFlags \|= SHFL_CF_ACCESS_READ;
343	break;
344
345	case O_WRONLY:
346	params.CreateFlags \|= SHFL_CF_ACCESS_WRITE;
347	break;
348
349	case O_RDWR:
350	params.CreateFlags \|= SHFL_CF_ACCESS_READWRITE;
351	break;
352
353	default:
354	BUG ();
355	}
356
357	if (file->f_flags & O_APPEND)
358	{
359	LogFunc(("O_APPEND set\n"));
360	params.CreateFlags \|= SHFL_CF_ACCESS_APPEND;
361	}
362
363	params.Info.Attr.fMode = inode->i_mode;
364	LogFunc(("sf_reg_open: calling VbglR0SfCreate, file %s, flags=%#x, %#x\n",
365	sf_i->path->String.utf8 , file->f_flags, params.CreateFlags));
366	rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path, &params);
367	if (RT_FAILURE(rc))
368	{
369	LogFunc(("VbglR0SfCreate failed flags=%d,%#x rc=%Rrc\n",
370	file->f_flags, params.CreateFlags, rc));
371	kfree(sf_r);
372	return -RTErrConvertToErrno(rc);
373	}
374
375	if (SHFL_HANDLE_NIL == params.Handle)
376	{
377	switch (params.Result)
378	{
379	case SHFL_PATH_NOT_FOUND:
380	case SHFL_FILE_NOT_FOUND:
381	rc_linux = -ENOENT;
382	break;
383	case SHFL_FILE_EXISTS:
384	rc_linux = -EEXIST;
385	break;
386	default:
387	break;
388	}
389	}
390
391	sf_i->force_restat = 1;
392	sf_r->handle = params.Handle;
393	sf_i->file = file;
394	file->private_data = sf_r;
395	return rc_linux;
396	}
397
398	/**
399	* Close a regular file.
400	*
401	* @param inode the inode
402	* @param file the file
403	* @returns 0 on success, Linux error code otherwise
404	*/
405	static int sf_reg_release(struct inode inode, struct file file)
406	{
407	int rc;
408	struct sf_reg_info *sf_r;
409	struct sf_glob_info *sf_g;
410	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
411
412	TRACE();
413	sf_g = GET_GLOB_INFO(inode->i_sb);
414	sf_r = file->private_data;
415
416	BUG_ON(!sf_g);
417	BUG_ON(!sf_r);
418
419	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
420	/* See the smbfs source (file.c). mmap in particular can cause data to be
421	* written to the file after it is closed, which we can't cope with. We
422	* copy and paste the body of filemap_write_and_wait() here as it was not
423	* defined before 2.6.6 and not exported until quite a bit later. */
424	/* filemap_write_and_wait(inode->i_mapping); */
425	if ( inode->i_mapping->nrpages
426	&& filemap_fdatawrite(inode->i_mapping) != -EIO)
427	filemap_fdatawait(inode->i_mapping);
428	#endif
429	rc = VbglR0SfClose(&client_handle, &sf_g->map, sf_r->handle);
430	if (RT_FAILURE(rc))
431	LogFunc(("VbglR0SfClose failed rc=%Rrc\n", rc));
432
433	kfree(sf_r);
434	sf_i->file = NULL;
435	sf_i->handle = SHFL_HANDLE_NIL;
436	file->private_data = NULL;
437	return 0;
438	}
439
440	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
441	static int sf_reg_fault(struct vm_fault *vmf)
442	#elif LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
443	static int sf_reg_fault(struct vm_area_struct vma, struct vm_fault vmf)
444	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
445	static struct page sf_reg_nopage(struct vm_area_struct vma, unsigned long vaddr, int *type)
446	# define SET_TYPE(t) *type = (t)
447	#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) */
448	static struct page sf_reg_nopage(struct vm_area_struct vma, unsigned long vaddr, int unused)
449	# define SET_TYPE(t)
450	#endif
451	{
452	struct page *page;
453	char *buf;
454	loff_t off;
455	uint32_t nread = PAGE_SIZE;
456	int err;
457	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
458	struct vm_area_struct *vma = vmf->vma;
459	#endif
460	struct file *file = vma->vm_file;
461	struct inode *inode = GET_F_DENTRY(file)->d_inode;
462	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
463	struct sf_reg_info *sf_r = file->private_data;
464
465	TRACE();
466	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
467	if (vmf->pgoff > vma->vm_end)
468	return VM_FAULT_SIGBUS;
469	#else
470	if (vaddr > vma->vm_end)
471	{
472	SET_TYPE(VM_FAULT_SIGBUS);
473	return NOPAGE_SIGBUS;
474	}
475	#endif
476
477	/* Don't use GFP_HIGHUSER as long as sf_reg_read_aux() calls VbglR0SfRead()
478	* which works on virtual addresses. On Linux cannot reliably determine the
479	* physical address for high memory, see rtR0MemObjNativeLockKernel(). */
480	page = alloc_page(GFP_USER);
481	if (!page) {
482	LogRelFunc(("failed to allocate page\n"));
483	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
484	return VM_FAULT_OOM;
485	#else
486	SET_TYPE(VM_FAULT_OOM);
487	return NOPAGE_OOM;
488	#endif
489	}
490
491	buf = kmap(page);
492	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
493	off = (vmf->pgoff << PAGE_SHIFT);
494	#else
495	off = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
496	#endif
497	err = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off);
498	if (err)
499	{
500	kunmap(page);
501	put_page(page);
502	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
503	return VM_FAULT_SIGBUS;
504	#else
505	SET_TYPE(VM_FAULT_SIGBUS);
506	return NOPAGE_SIGBUS;
507	#endif
508	}
509
510	BUG_ON (nread > PAGE_SIZE);
511	if (!nread)
512	{
513	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
514	clear_user_page(page_address(page), vmf->pgoff, page);
515	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
516	clear_user_page(page_address(page), vaddr, page);
517	#else
518	clear_user_page(page_address(page), vaddr);
519	#endif
520	}
521	else
522	memset(buf + nread, 0, PAGE_SIZE - nread);
523
524	flush_dcache_page(page);
525	kunmap(page);
526	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
527	vmf->page = page;
528	return 0;
529	#else
530	SET_TYPE(VM_FAULT_MAJOR);
531	return page;
532	#endif
533	}
534
535	static struct vm_operations_struct sf_vma_ops =
536	{
537	#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25)
538	.fault = sf_reg_fault
539	#else
540	.nopage = sf_reg_nopage
541	#endif
542	};
543
544	static int sf_reg_mmap(struct file file, struct vm_area_struct vma)
545	{
546	TRACE();
547	if (vma->vm_flags & VM_SHARED)
548	{
549	LogFunc(("shared mmapping not available\n"));
550	return -EINVAL;
551	}
552
553	vma->vm_ops = &sf_vma_ops;
554	return 0;
555	}
556
557	struct file_operations sf_reg_fops =
558	{
559	.read = sf_reg_read,
560	.open = sf_reg_open,
561	.write = sf_reg_write,
562	.release = sf_reg_release,
563	.mmap = sf_reg_mmap,
564	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
565	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31)
566	/** @todo This code is known to cause caching of data which should not be
567	* cached. Investigate. */
568	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
569	.splice_read = generic_file_splice_read,
570	# else
571	.sendfile = generic_file_sendfile,
572	# endif
573	.aio_read = generic_file_aio_read,
574	.aio_write = generic_file_aio_write,
575	# endif
576	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35)
577	.fsync = noop_fsync,
578	# else
579	.fsync = simple_sync_file,
580	# endif
581	.llseek = generic_file_llseek,
582	#endif
583	};
584
585
586	struct inode_operations sf_reg_iops =
587	{
588	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
589	.revalidate = sf_inode_revalidate
590	#else
591	.getattr = sf_getattr,
592	.setattr = sf_setattr
593	#endif
594	};
595
596
597	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
598	static int sf_readpage(struct file file, struct page page)
599	{
600	struct inode *inode = GET_F_DENTRY(file)->d_inode;
601	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
602	struct sf_reg_info *sf_r = file->private_data;
603	uint32_t nread = PAGE_SIZE;
604	char *buf;
605	loff_t off = ((loff_t)page->index) << PAGE_SHIFT;
606	int ret;
607
608	TRACE();
609
610	buf = kmap(page);
611	ret = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off);
612	if (ret)
613	{
614	kunmap(page);
615	if (PageLocked(page))
616	unlock_page(page);
617	return ret;
618	}
619	BUG_ON(nread > PAGE_SIZE);
620	memset(&buf[nread], 0, PAGE_SIZE - nread);
621	flush_dcache_page(page);
622	kunmap(page);
623	SetPageUptodate(page);
624	unlock_page(page);
625	return 0;
626	}
627
628	static int
629	sf_writepage(struct page page, struct writeback_control wbc)
630	{
631	struct address_space *mapping = page->mapping;
632	struct inode *inode = mapping->host;
633	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
634	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
635	struct file *file = sf_i->file;
636	struct sf_reg_info *sf_r = file->private_data;
637	char *buf;
638	uint32_t nwritten = PAGE_SIZE;
639	int end_index = inode->i_size >> PAGE_SHIFT;
640	loff_t off = ((loff_t) page->index) << PAGE_SHIFT;
641	int err;
642
643	TRACE();
644
645	if (page->index >= end_index)
646	nwritten = inode->i_size & (PAGE_SIZE-1);
647
648	buf = kmap(page);
649
650	err = sf_reg_write_aux(__func__, sf_g, sf_r, buf, &nwritten, off);
651	if (err < 0)
652	{
653	ClearPageUptodate(page);
654	goto out;
655	}
656
657	if (off > inode->i_size)
658	inode->i_size = off;
659
660	if (PageError(page))
661	ClearPageError(page);
662	err = 0;
663
664	out:
665	kunmap(page);
666
667	unlock_page(page);
668	return err;
669	}
670
671	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
672	int sf_write_begin(struct file file, struct address_space mapping, loff_t pos,
673	unsigned len, unsigned flags, struct page pagep, void fsdata)
674	{
675	TRACE();
676
677	return simple_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
678	}
679
680	int sf_write_end(struct file file, struct address_space mapping, loff_t pos,
681	unsigned len, unsigned copied, struct page page, void fsdata)
682	{
683	struct inode *inode = mapping->host;
684	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
685	struct sf_reg_info *sf_r = file->private_data;
686	void *buf;
687	unsigned from = pos & (PAGE_SIZE - 1);
688	uint32_t nwritten = len;
689	int err;
690
691	TRACE();
692
693	buf = kmap(page);
694	err = sf_reg_write_aux(__func__, sf_g, sf_r, buf+from, &nwritten, pos);
695	kunmap(page);
696
697	if (!PageUptodate(page) && err == PAGE_SIZE)
698	SetPageUptodate(page);
699
700	if (err >= 0) {
701	pos += nwritten;
702	if (pos > inode->i_size)
703	inode->i_size = pos;
704	}
705
706	unlock_page(page);
707	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
708	put_page(page);
709	#else
710	page_cache_release(page);
711	#endif
712
713	return nwritten;
714	}
715
716	# endif /* KERNEL_VERSION >= 2.6.24 */
717
718	struct address_space_operations sf_reg_aops =
719	{
720	.readpage = sf_readpage,
721	.writepage = sf_writepage,
722	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
723	.write_begin = sf_write_begin,
724	.write_end = sf_write_end,
725	# else
726	.prepare_write = simple_prepare_write,
727	.commit_write = simple_commit_write,
728	# endif
729	};
730	#endif

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source: vbox/trunk/src/VBox/Additions/linux/sharedfolders/regops.c@ 69496

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