utils.c@ 76598

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1	/** @file
2	*
3	* vboxsf -- VirtualBox Guest Additions for Linux:
4	* Utility functions.
5	* Mainly conversion from/to VirtualBox/Linux data structures
6	*/
7
8	/*
9	* Copyright (C) 2006-2019 Oracle Corporation
10	*
11	* Permission is hereby granted, free of charge, to any person
12	* obtaining a copy of this software and associated documentation
13	* files (the "Software"), to deal in the Software without
14	* restriction, including without limitation the rights to use,
15	* copy, modify, merge, publish, distribute, sublicense, and/or sell
16	* copies of the Software, and to permit persons to whom the
17	* Software is furnished to do so, subject to the following
18	* conditions:
19	*
20	* The above copyright notice and this permission notice shall be
21	* included in all copies or substantial portions of the Software.
22	*
23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
25	* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
27	* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
28	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30	* OTHER DEALINGS IN THE SOFTWARE.
31	*/
32
33	#include "vfsmod.h"
34	#include <iprt/asm.h>
35	#include <iprt/err.h>
36	#include <linux/nfs_fs.h>
37	#include <linux/vfs.h>
38
39	/* #define USE_VMALLOC */
40
41	/*
42	* sf_reg_aops and sf_backing_dev_info are just quick implementations to make
43	* sendfile work. For more information have a look at
44	*
45	* http://us1.samba.org/samba/ftp/cifs-cvs/ols2006-fs-tutorial-smf.odp
46	*
47	* and the sample implementation
48	*
49	* http://pserver.samba.org/samba/ftp/cifs-cvs/samplefs.tar.gz
50	*/
51
52	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
53	static void sf_ftime_from_timespec(time_t * time, RTTIMESPEC * ts)
54	{
55	int64_t t = RTTimeSpecGetNano(ts);
56
57	do_div(t, 1000000000);
58	*time = t;
59	}
60
61	static void sf_timespec_from_ftime(RTTIMESPEC * ts, time_t * time)
62	{
63	int64_t t = 1000000000 * *time;
64	RTTimeSpecSetNano(ts, t);
65	}
66	#else /* >= 2.6.0 */
67	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
68	static void sf_ftime_from_timespec(struct timespec tv, RTTIMESPEC ts)
69	#else
70	static void sf_ftime_from_timespec(struct timespec64 tv, RTTIMESPEC ts)
71	#endif
72	{
73	int64_t t = RTTimeSpecGetNano(ts);
74	int64_t nsec;
75
76	nsec = do_div(t, 1000000000);
77	tv->tv_sec = t;
78	tv->tv_nsec = nsec;
79	}
80
81	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
82	static void sf_timespec_from_ftime(RTTIMESPEC ts, struct timespec tv)
83	#else
84	static void sf_timespec_from_ftime(RTTIMESPEC ts, struct timespec64 tv)
85	#endif
86	{
87	int64_t t = (int64_t) tv->tv_nsec + (int64_t) tv->tv_sec * 1000000000;
88	RTTimeSpecSetNano(ts, t);
89	}
90	#endif /* >= 2.6.0 */
91
92	/* set [inode] attributes based on [info], uid/gid based on [sf_g] */
93	void sf_init_inode(struct sf_glob_info sf_g, struct inode inode,
94	PSHFLFSOBJINFO info)
95	{
96	PSHFLFSOBJATTR attr;
97	int mode;
98
99	TRACE();
100
101	attr = &info->Attr;
102
103	#define mode_set(r) attr->fMode & (RTFS_UNIX_##r) ? (S_##r) : 0;
104	mode = mode_set(IRUSR);
105	mode \|= mode_set(IWUSR);
106	mode \|= mode_set(IXUSR);
107
108	mode \|= mode_set(IRGRP);
109	mode \|= mode_set(IWGRP);
110	mode \|= mode_set(IXGRP);
111
112	mode \|= mode_set(IROTH);
113	mode \|= mode_set(IWOTH);
114	mode \|= mode_set(IXOTH);
115
116	#undef mode_set
117
118	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
119	inode->i_mapping->a_ops = &sf_reg_aops;
120	#if LINUX_VERSION_CODE <= KERNEL_VERSION(3, 19, 0)
121	/* XXX Was this ever necessary? */
122	inode->i_mapping->backing_dev_info = &sf_g->bdi;
123	#endif
124	#endif
125
126	if (RTFS_IS_DIRECTORY(attr->fMode)) {
127	inode->i_mode = sf_g->dmode != ~0 ? (sf_g->dmode & 0777) : mode;
128	inode->i_mode &= ~sf_g->dmask;
129	inode->i_mode \|= S_IFDIR;
130	inode->i_op = &sf_dir_iops;
131	inode->i_fop = &sf_dir_fops;
132	/* XXX: this probably should be set to the number of entries
133	in the directory plus two (. ..) */
134	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
135	set_nlink(inode, 1);
136	#else
137	inode->i_nlink = 1;
138	#endif
139	}
140	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
141	else if (RTFS_IS_SYMLINK(attr->fMode)) {
142	inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
143	inode->i_mode &= ~sf_g->fmask;
144	inode->i_mode \|= S_IFLNK;
145	inode->i_op = &sf_lnk_iops;
146	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
147	set_nlink(inode, 1);
148	#else
149	inode->i_nlink = 1;
150	#endif
151	}
152	#endif
153	else {
154	inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
155	inode->i_mode &= ~sf_g->fmask;
156	inode->i_mode \|= S_IFREG;
157	inode->i_op = &sf_reg_iops;
158	inode->i_fop = &sf_reg_fops;
159	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
160	set_nlink(inode, 1);
161	#else
162	inode->i_nlink = 1;
163	#endif
164	}
165
166	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
167	inode->i_uid = make_kuid(current_user_ns(), sf_g->uid);
168	inode->i_gid = make_kgid(current_user_ns(), sf_g->gid);
169	#else
170	inode->i_uid = sf_g->uid;
171	inode->i_gid = sf_g->gid;
172	#endif
173
174	inode->i_size = info->cbObject;
175	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) && !defined(KERNEL_FC6)
176	inode->i_blksize = 4096;
177	#endif
178	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 11)
179	inode->i_blkbits = 12;
180	#endif
181	/* i_blocks always in units of 512 bytes! */
182	inode->i_blocks = (info->cbAllocated + 511) / 512;
183
184	sf_ftime_from_timespec(&inode->i_atime, &info->AccessTime);
185	sf_ftime_from_timespec(&inode->i_ctime, &info->ChangeTime);
186	sf_ftime_from_timespec(&inode->i_mtime, &info->ModificationTime);
187	}
188
189	int sf_stat(const char caller, struct sf_glob_info sf_g,
190	SHFLSTRING * path, PSHFLFSOBJINFO result, int ok_to_fail)
191	{
192	int rc;
193	SHFLCREATEPARMS params;
194	NOREF(caller);
195
196	TRACE();
197
198	RT_ZERO(params);
199	params.Handle = SHFL_HANDLE_NIL;
200	params.CreateFlags = SHFL_CF_LOOKUP \| SHFL_CF_ACT_FAIL_IF_NEW;
201	LogFunc(("sf_stat: calling VbglR0SfCreate, file %s, flags %#x\n",
202	path->String.utf8, params.CreateFlags));
203	rc = VbglR0SfCreate(&client_handle, &sf_g->map, path, &params);
204	if (rc == VERR_INVALID_NAME) {
205	/* this can happen for names like 'foo' on a Windows host /
206	return -ENOENT;
207	}
208	if (RT_FAILURE(rc)) {
209	LogFunc(("VbglR0SfCreate(%s) failed. caller=%s, rc=%Rrc\n",
210	path->String.utf8, rc, caller));
211	return -EPROTO;
212	}
213	if (params.Result != SHFL_FILE_EXISTS) {
214	if (!ok_to_fail)
215	LogFunc(("VbglR0SfCreate(%s) file does not exist. caller=%s, result=%d\n", path->String.utf8, params.Result, caller));
216	return -ENOENT;
217	}
218
219	*result = params.Info;
220	return 0;
221	}
222
223	/* this is called directly as iop on 2.4, indirectly as dop
224	[sf_dentry_revalidate] on 2.4/2.6, indirectly as iop through
225	[sf_getattr] on 2.6. the job is to find out whether dentry/inode is
226	still valid. the test is failed if [dentry] does not have an inode
227	or [sf_stat] is unsuccessful, otherwise we return success and
228	update inode attributes */
229	int sf_inode_revalidate(struct dentry *dentry)
230	{
231	int err;
232	struct sf_glob_info *sf_g;
233	struct sf_inode_info *sf_i;
234	SHFLFSOBJINFO info;
235
236	TRACE();
237	if (!dentry \|\| !dentry->d_inode) {
238	LogFunc(("no dentry(%p) or inode(%p)\n", dentry,
239	dentry->d_inode));
240	return -EINVAL;
241	}
242
243	sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
244	sf_i = GET_INODE_INFO(dentry->d_inode);
245
246	#if 0
247	printk("%s called by %p:%p\n",
248	sf_i->path->String.utf8,
249	__builtin_return_address(0), __builtin_return_address(1));
250	#endif
251
252	BUG_ON(!sf_g);
253	BUG_ON(!sf_i);
254
255	if (!sf_i->force_restat) {
256	if (jiffies - dentry->d_time < sf_g->ttl)
257	return 0;
258	}
259
260	err = sf_stat(__func__, sf_g, sf_i->path, &info, 1);
261	if (err)
262	return err;
263
264	dentry->d_time = jiffies;
265	sf_init_inode(sf_g, dentry->d_inode, &info);
266	return 0;
267	}
268
269	/* this is called during name resolution/lookup to check if the
270	[dentry] in the cache is still valid. the job is handled by
271	[sf_inode_revalidate] */
272	static int
273	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
274	sf_dentry_revalidate(struct dentry *dentry, unsigned flags)
275	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
276	sf_dentry_revalidate(struct dentry dentry, struct nameidata nd)
277	#else
278	sf_dentry_revalidate(struct dentry *dentry, int flags)
279	#endif
280	{
281	TRACE();
282
283	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
284	if (flags & LOOKUP_RCU)
285	return -ECHILD;
286	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)
287	/* see Documentation/filesystems/vfs.txt */
288	if (nd && nd->flags & LOOKUP_RCU)
289	return -ECHILD;
290	#endif
291
292	if (sf_inode_revalidate(dentry))
293	return 0;
294
295	return 1;
296	}
297
298	/* on 2.6 this is a proxy for [sf_inode_revalidate] which (as a side
299	effect) updates inode attributes for [dentry] (given that [dentry]
300	has inode at all) from these new attributes we derive [kstat] via
301	[generic_fillattr] */
302	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
303	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
304	int sf_getattr(const struct path path, struct kstat kstat, u32 request_mask,
305	unsigned int flags)
306	#else
307	int sf_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *kstat)
308	#endif
309	{
310	int err;
311	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
312	struct dentry *dentry = path->dentry;
313	#endif
314
315	TRACE();
316	err = sf_inode_revalidate(dentry);
317	if (err)
318	return err;
319
320	generic_fillattr(dentry->d_inode, kstat);
321	return 0;
322	}
323
324	int sf_setattr(struct dentry dentry, struct iattr iattr)
325	{
326	struct sf_glob_info *sf_g;
327	struct sf_inode_info *sf_i;
328	SHFLCREATEPARMS params;
329	SHFLFSOBJINFO info;
330	uint32_t cbBuffer;
331	int rc, err;
332
333	TRACE();
334
335	sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
336	sf_i = GET_INODE_INFO(dentry->d_inode);
337	err = 0;
338
339	RT_ZERO(params);
340	params.Handle = SHFL_HANDLE_NIL;
341	params.CreateFlags = SHFL_CF_ACT_OPEN_IF_EXISTS
342	\| SHFL_CF_ACT_FAIL_IF_NEW \| SHFL_CF_ACCESS_ATTR_WRITE;
343
344	/* this is at least required for Posix hosts */
345	if (iattr->ia_valid & ATTR_SIZE)
346	params.CreateFlags \|= SHFL_CF_ACCESS_WRITE;
347
348	rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path, &params);
349	if (RT_FAILURE(rc)) {
350	LogFunc(("VbglR0SfCreate(%s) failed rc=%Rrc\n",
351	sf_i->path->String.utf8, rc));
352	err = -RTErrConvertToErrno(rc);
353	goto fail2;
354	}
355	if (params.Result != SHFL_FILE_EXISTS) {
356	LogFunc(("file %s does not exist\n", sf_i->path->String.utf8));
357	err = -ENOENT;
358	goto fail1;
359	}
360
361	/* Setting the file size and setting the other attributes has to be
362	* handled separately, see implementation of vbsfSetFSInfo() in
363	* vbsf.cpp */
364	if (iattr->ia_valid & (ATTR_MODE \| ATTR_ATIME \| ATTR_MTIME)) {
365	#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? RTFS_UNIX_##r : 0)
366
367	RT_ZERO(info);
368	if (iattr->ia_valid & ATTR_MODE) {
369	info.Attr.fMode = mode_set(IRUSR);
370	info.Attr.fMode \|= mode_set(IWUSR);
371	info.Attr.fMode \|= mode_set(IXUSR);
372	info.Attr.fMode \|= mode_set(IRGRP);
373	info.Attr.fMode \|= mode_set(IWGRP);
374	info.Attr.fMode \|= mode_set(IXGRP);
375	info.Attr.fMode \|= mode_set(IROTH);
376	info.Attr.fMode \|= mode_set(IWOTH);
377	info.Attr.fMode \|= mode_set(IXOTH);
378
379	if (iattr->ia_mode & S_IFDIR)
380	info.Attr.fMode \|= RTFS_TYPE_DIRECTORY;
381	else
382	info.Attr.fMode \|= RTFS_TYPE_FILE;
383	}
384
385	if (iattr->ia_valid & ATTR_ATIME)
386	sf_timespec_from_ftime(&info.AccessTime,
387	&iattr->ia_atime);
388	if (iattr->ia_valid & ATTR_MTIME)
389	sf_timespec_from_ftime(&info.ModificationTime,
390	&iattr->ia_mtime);
391	/* ignore ctime (inode change time) as it can't be set from userland anyway */
392
393	cbBuffer = sizeof(info);
394	rc = VbglR0SfFsInfo(&client_handle, &sf_g->map, params.Handle,
395	SHFL_INFO_SET \| SHFL_INFO_FILE, &cbBuffer,
396	(PSHFLDIRINFO) & info);
397	if (RT_FAILURE(rc)) {
398	LogFunc(("VbglR0SfFsInfo(%s, FILE) failed rc=%Rrc\n",
399	sf_i->path->String.utf8, rc));
400	err = -RTErrConvertToErrno(rc);
401	goto fail1;
402	}
403	}
404
405	if (iattr->ia_valid & ATTR_SIZE) {
406	RT_ZERO(info);
407	info.cbObject = iattr->ia_size;
408	cbBuffer = sizeof(info);
409	rc = VbglR0SfFsInfo(&client_handle, &sf_g->map, params.Handle,
410	SHFL_INFO_SET \| SHFL_INFO_SIZE, &cbBuffer,
411	(PSHFLDIRINFO) & info);
412	if (RT_FAILURE(rc)) {
413	LogFunc(("VbglR0SfFsInfo(%s, SIZE) failed rc=%Rrc\n",
414	sf_i->path->String.utf8, rc));
415	err = -RTErrConvertToErrno(rc);
416	goto fail1;
417	}
418	}
419
420	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
421	if (RT_FAILURE(rc))
422	LogFunc(("VbglR0SfClose(%s) failed rc=%Rrc\n",
423	sf_i->path->String.utf8, rc));
424
425	return sf_inode_revalidate(dentry);
426
427	fail1:
428	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
429	if (RT_FAILURE(rc))
430	LogFunc(("VbglR0SfClose(%s) failed rc=%Rrc\n",
431	sf_i->path->String.utf8, rc));
432
433	fail2:
434	return err;
435	}
436	#endif /* >= 2.6.0 */
437
438	static int sf_make_path(const char caller, struct sf_inode_info sf_i,
439	const char d_name, size_t d_len, SHFLSTRING * result)
440	{
441	size_t path_len, shflstring_len;
442	SHFLSTRING *tmp;
443	uint16_t p_len;
444	uint8_t *p_name;
445	int fRoot = 0;
446
447	TRACE();
448	p_len = sf_i->path->u16Length;
449	p_name = sf_i->path->String.utf8;
450
451	if (p_len == 1 && *p_name == '/') {
452	path_len = d_len + 1;
453	fRoot = 1;
454	} else {
455	/* lengths of constituents plus terminating zero plus slash */
456	path_len = p_len + d_len + 2;
457	if (path_len > 0xffff) {
458	LogFunc(("path too long. caller=%s, path_len=%zu\n",
459	caller, path_len));
460	return -ENAMETOOLONG;
461	}
462	}
463
464	shflstring_len = offsetof(SHFLSTRING, String.utf8) + path_len;
465	tmp = kmalloc(shflstring_len, GFP_KERNEL);
466	if (!tmp) {
467	LogRelFunc(("kmalloc failed, caller=%s\n", caller));
468	return -ENOMEM;
469	}
470	tmp->u16Length = path_len - 1;
471	tmp->u16Size = path_len;
472
473	if (fRoot)
474	memcpy(&tmp->String.utf8[0], d_name, d_len + 1);
475	else {
476	memcpy(&tmp->String.utf8[0], p_name, p_len);
477	tmp->String.utf8[p_len] = '/';
478	memcpy(&tmp->String.utf8[p_len + 1], d_name, d_len);
479	tmp->String.utf8[p_len + 1 + d_len] = '\0';
480	}
481
482	*result = tmp;
483	return 0;
484	}
485
486	/**
487	* [dentry] contains string encoded in coding system that corresponds
488	* to [sf_g]->nls, we must convert it to UTF8 here and pass down to
489	* [sf_make_path] which will allocate SHFLSTRING and fill it in
490	*/
491	int sf_path_from_dentry(const char caller, struct sf_glob_info sf_g,
492	struct sf_inode_info sf_i, struct dentry dentry,
493	SHFLSTRING ** result)
494	{
495	int err;
496	const char *d_name;
497	size_t d_len;
498	const char *name;
499	size_t len = 0;
500
501	TRACE();
502	d_name = dentry->d_name.name;
503	d_len = dentry->d_name.len;
504
505	if (sf_g->nls) {
506	size_t in_len, i, out_bound_len;
507	const char *in;
508	char *out;
509
510	in = d_name;
511	in_len = d_len;
512
513	out_bound_len = PATH_MAX;
514	out = kmalloc(out_bound_len, GFP_KERNEL);
515	name = out;
516
517	for (i = 0; i < d_len; ++i) {
518	/* We renamed the linux kernel wchar_t type to linux_wchar_t in
519	the-linux-kernel.h, as it conflicts with the C++ type of that name. */
520	linux_wchar_t uni;
521	int nb;
522
523	nb = sf_g->nls->char2uni(in, in_len, &uni);
524	if (nb < 0) {
525	LogFunc(("nls->char2uni failed %x %d\n",
526	*in, in_len));
527	err = -EINVAL;
528	goto fail1;
529	}
530	in_len -= nb;
531	in += nb;
532
533	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
534	nb = utf32_to_utf8(uni, out, out_bound_len);
535	#else
536	nb = utf8_wctomb(out, uni, out_bound_len);
537	#endif
538	if (nb < 0) {
539	LogFunc(("nls->uni2char failed %x %d\n",
540	uni, out_bound_len));
541	err = -EINVAL;
542	goto fail1;
543	}
544	out_bound_len -= nb;
545	out += nb;
546	len += nb;
547	}
548	if (len >= PATH_MAX - 1) {
549	err = -ENAMETOOLONG;
550	goto fail1;
551	}
552
553	LogFunc(("result(%d) = %.*s\n", len, len, name));
554	*out = 0;
555	} else {
556	name = d_name;
557	len = d_len;
558	}
559
560	err = sf_make_path(caller, sf_i, name, len, result);
561	if (name != d_name)
562	kfree(name);
563
564	return err;
565
566	fail1:
567	kfree(name);
568	return err;
569	}
570
571	int sf_nlscpy(struct sf_glob_info *sf_g,
572	char *name, size_t name_bound_len,
573	const unsigned char *utf8_name, size_t utf8_len)
574	{
575	if (sf_g->nls) {
576	const char *in;
577	char *out;
578	size_t out_len;
579	size_t out_bound_len;
580	size_t in_bound_len;
581
582	in = utf8_name;
583	in_bound_len = utf8_len;
584
585	out = name;
586	out_len = 0;
587	out_bound_len = name_bound_len;
588
589	while (in_bound_len) {
590	int nb;
591	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
592	unicode_t uni;
593
594	nb = utf8_to_utf32(in, in_bound_len, &uni);
595	#else
596	linux_wchar_t uni;
597
598	nb = utf8_mbtowc(&uni, in, in_bound_len);
599	#endif
600	if (nb < 0) {
601	LogFunc(("utf8_mbtowc failed(%s) %x:%d\n",
602	(const char )utf8_name, in,
603	in_bound_len));
604	return -EINVAL;
605	}
606	in += nb;
607	in_bound_len -= nb;
608
609	nb = sf_g->nls->uni2char(uni, out, out_bound_len);
610	if (nb < 0) {
611	LogFunc(("nls->uni2char failed(%s) %x:%d\n",
612	utf8_name, uni, out_bound_len));
613	return nb;
614	}
615	out += nb;
616	out_bound_len -= nb;
617	out_len += nb;
618	}
619
620	*out = 0;
621	} else {
622	if (utf8_len + 1 > name_bound_len)
623	return -ENAMETOOLONG;
624
625	memcpy(name, utf8_name, utf8_len + 1);
626	}
627	return 0;
628	}
629
630	static struct sf_dir_buf *sf_dir_buf_alloc(void)
631	{
632	struct sf_dir_buf *b;
633
634	TRACE();
635	b = kmalloc(sizeof(*b), GFP_KERNEL);
636	if (!b) {
637	LogRelFunc(("could not alloc directory buffer\n"));
638	return NULL;
639	}
640	#ifdef USE_VMALLOC
641	b->buf = vmalloc(DIR_BUFFER_SIZE);
642	#else
643	b->buf = kmalloc(DIR_BUFFER_SIZE, GFP_KERNEL);
644	#endif
645	if (!b->buf) {
646	kfree(b);
647	LogRelFunc(("could not alloc directory buffer storage\n"));
648	return NULL;
649	}
650
651	INIT_LIST_HEAD(&b->head);
652	b->cEntries = 0;
653	b->cbUsed = 0;
654	b->cbFree = DIR_BUFFER_SIZE;
655	return b;
656	}
657
658	static void sf_dir_buf_free(struct sf_dir_buf *b)
659	{
660	BUG_ON(!b \|\| !b->buf);
661
662	TRACE();
663	list_del(&b->head);
664	#ifdef USE_VMALLOC
665	vfree(b->buf);
666	#else
667	kfree(b->buf);
668	#endif
669	kfree(b);
670	}
671
672	/**
673	* Free the directory buffer.
674	*/
675	void sf_dir_info_free(struct sf_dir_info *p)
676	{
677	struct list_head list, pos, *tmp;
678
679	TRACE();
680	list = &p->info_list;
681	list_for_each_safe(pos, tmp, list) {
682	struct sf_dir_buf *b;
683
684	b = list_entry(pos, struct sf_dir_buf, head);
685	sf_dir_buf_free(b);
686	}
687	kfree(p);
688	}
689
690	/**
691	* Empty (but not free) the directory buffer.
692	*/
693	void sf_dir_info_empty(struct sf_dir_info *p)
694	{
695	struct list_head list, pos, *tmp;
696	TRACE();
697	list = &p->info_list;
698	list_for_each_safe(pos, tmp, list) {
699	struct sf_dir_buf *b;
700	b = list_entry(pos, struct sf_dir_buf, head);
701	b->cEntries = 0;
702	b->cbUsed = 0;
703	b->cbFree = DIR_BUFFER_SIZE;
704	}
705	}
706
707	/**
708	* Create a new directory buffer descriptor.
709	*/
710	struct sf_dir_info *sf_dir_info_alloc(void)
711	{
712	struct sf_dir_info *p;
713
714	TRACE();
715	p = kmalloc(sizeof(*p), GFP_KERNEL);
716	if (!p) {
717	LogRelFunc(("could not alloc directory info\n"));
718	return NULL;
719	}
720
721	INIT_LIST_HEAD(&p->info_list);
722	return p;
723	}
724
725	/**
726	* Search for an empty directory content buffer.
727	*/
728	static struct sf_dir_buf sf_get_empty_dir_buf(struct sf_dir_info sf_d)
729	{
730	struct list_head list, pos;
731
732	list = &sf_d->info_list;
733	list_for_each(pos, list) {
734	struct sf_dir_buf *b;
735
736	b = list_entry(pos, struct sf_dir_buf, head);
737	if (!b)
738	return NULL;
739	else {
740	if (b->cbUsed == 0)
741	return b;
742	}
743	}
744
745	return NULL;
746	}
747
748	int sf_dir_read_all(struct sf_glob_info sf_g, struct sf_inode_info sf_i,
749	struct sf_dir_info *sf_d, SHFLHANDLE handle)
750	{
751	int err;
752	SHFLSTRING *mask;
753	struct sf_dir_buf *b;
754
755	TRACE();
756	err = sf_make_path(__func__, sf_i, "*", 1, &mask);
757	if (err)
758	goto fail0;
759
760	for (;;) {
761	int rc;
762	void *buf;
763	uint32_t cbSize;
764	uint32_t cEntries;
765
766	b = sf_get_empty_dir_buf(sf_d);
767	if (!b) {
768	b = sf_dir_buf_alloc();
769	if (!b) {
770	err = -ENOMEM;
771	LogRelFunc(("could not alloc directory buffer\n"));
772	goto fail1;
773	}
774	list_add(&b->head, &sf_d->info_list);
775	}
776
777	buf = b->buf;
778	cbSize = b->cbFree;
779
780	rc = VbglR0SfDirInfo(&client_handle, &sf_g->map, handle, mask,
781	0, 0, &cbSize, buf, &cEntries);
782	switch (rc) {
783	case VINF_SUCCESS:
784	RT_FALL_THRU();
785	case VERR_NO_MORE_FILES:
786	break;
787	case VERR_NO_TRANSLATION:
788	LogFunc(("host could not translate entry\n"));
789	/* XXX */
790	break;
791	default:
792	err = -RTErrConvertToErrno(rc);
793	LogFunc(("VbglR0SfDirInfo failed rc=%Rrc\n", rc));
794	goto fail1;
795	}
796
797	b->cEntries += cEntries;
798	b->cbFree -= cbSize;
799	b->cbUsed += cbSize;
800
801	if (RT_FAILURE(rc))
802	break;
803	}
804	err = 0;
805
806	fail1:
807	kfree(mask);
808
809	fail0:
810	return err;
811	}
812
813	int sf_get_volume_info(struct super_block sb, STRUCT_STATFS stat)
814	{
815	struct sf_glob_info *sf_g;
816	SHFLVOLINFO SHFLVolumeInfo;
817	uint32_t cbBuffer;
818	int rc;
819
820	sf_g = GET_GLOB_INFO(sb);
821	cbBuffer = sizeof(SHFLVolumeInfo);
822	rc = VbglR0SfFsInfo(&client_handle, &sf_g->map, 0,
823	SHFL_INFO_GET \| SHFL_INFO_VOLUME, &cbBuffer,
824	(PSHFLDIRINFO) & SHFLVolumeInfo);
825	if (RT_FAILURE(rc))
826	return -RTErrConvertToErrno(rc);
827
828	stat->f_type = NFS_SUPER_MAGIC; /* XXX vboxsf type? */
829	stat->f_bsize = SHFLVolumeInfo.ulBytesPerAllocationUnit;
830	stat->f_blocks = SHFLVolumeInfo.ullTotalAllocationBytes
831	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
832	stat->f_bfree = SHFLVolumeInfo.ullAvailableAllocationBytes
833	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
834	stat->f_bavail = SHFLVolumeInfo.ullAvailableAllocationBytes
835	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
836	stat->f_files = 1000;
837	stat->f_ffree = 1000; /* don't return 0 here since the guest may think
838	* that it is not possible to create any more files */
839	stat->f_fsid.val[0] = 0;
840	stat->f_fsid.val[1] = 0;
841	stat->f_namelen = 255;
842	return 0;
843	}
844
845	struct dentry_operations sf_dentry_ops = {
846	.d_revalidate = sf_dentry_revalidate
847	};
848
849	int sf_init_backing_dev(struct sf_glob_info *sf_g)
850	{
851	int rc = 0;
852	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) && LINUX_VERSION_CODE <= KERNEL_VERSION(3, 19, 0)
853	/* Each new shared folder map gets a new uint64_t identifier,
854	* allocated in sequence. We ASSUME the sequence will not wrap. */
855	static uint64_t s_u64Sequence = 0;
856	uint64_t u64CurrentSequence = ASMAtomicIncU64(&s_u64Sequence);
857
858	sf_g->bdi.ra_pages = 0; /* No readahead */
859	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 12)
860	sf_g->bdi.capabilities = BDI_CAP_MAP_DIRECT /* MAP_SHARED */
861	\| BDI_CAP_MAP_COPY /* MAP_PRIVATE */
862	\| BDI_CAP_READ_MAP /* can be mapped for reading */
863	\| BDI_CAP_WRITE_MAP /* can be mapped for writing */
864	\| BDI_CAP_EXEC_MAP; /* can be mapped for execution */
865	#endif /* >= 2.6.12 */
866	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
867	rc = bdi_init(&sf_g->bdi);
868	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
869	if (!rc)
870	rc = bdi_register(&sf_g->bdi, NULL, "vboxsf-%llu",
871	(unsigned long long)u64CurrentSequence);
872	#endif /* >= 2.6.26 */
873	#endif /* >= 2.6.24 */
874	#endif /* >= 2.6.0 && <= 3.19.0 */
875	return rc;
876	}
877
878	void sf_done_backing_dev(struct sf_glob_info *sf_g)
879	{
880	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) && LINUX_VERSION_CODE <= KERNEL_VERSION(3, 19, 0)
881	bdi_destroy(&sf_g->bdi); /* includes bdi_unregister() */
882	#endif
883	}

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source: vbox/trunk/src/VBox/Additions/linux/sharedfolders/utils.c@ 76598

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