utils.c@ 23189

Last change on this file since 23189 was 23189, checked in by vboxsync, 16 years ago
Linux shared folders: implemented setting the file size
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 24.9 KB

Line
1	/** @file
2	*
3	* vboxvfs -- VirtualBox Guest Additions for Linux:
4	* Utility functions.
5	* Mainly conversion from/to VirtualBox/Linux data structures
6	*/
7
8	/*
9	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.215389.xyz. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
20	* Clara, CA 95054 USA or visit http://www.sun.com if you need
21	* additional information or have any questions.
22	*/
23
24	#include "vfsmod.h"
25	#include <linux/nfs_fs.h>
26	#include <linux/vfs.h>
27
28	/* #define USE_VMALLOC */
29
30	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 0)
31	/*
32	* sf_reg_aops and sf_backing_dev_info are just quick implementations to make
33	* sendfile work. For more information have a look at
34	*
35	* http://us1.samba.org/samba/ftp/cifs-cvs/ols2006-fs-tutorial-smf.odp
36	*
37	* and the sample implementation
38	*
39	* http://pserver.samba.org/samba/ftp/cifs-cvs/samplefs.tar.gz
40	*/
41
42	static struct backing_dev_info sf_backing_dev_info = {
43	.ra_pages = 0, /* No readahead */
44	# if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 12)
45	.capabilities = BDI_CAP_MAP_DIRECT /* MAP_SHARED */
46	\| BDI_CAP_MAP_COPY /* MAP_PRIVATE */
47	\| BDI_CAP_READ_MAP /* can be mapped for reading */
48	\| BDI_CAP_WRITE_MAP /* can be mapped for writing */
49	\| BDI_CAP_EXEC_MAP, /* can be mapped for execution */
50	# endif
51	};
52	#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 0) */
53
54	#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
55	static void
56	sf_ftime_from_timespec (time_t time, RTTIMESPEC ts)
57	{
58	int64_t t = RTTimeSpecGetNano (ts);
59
60	do_div (t, 1000000000);
61	*time = t;
62	}
63
64	static void
65	sf_timespec_from_ftime (RTTIMESPEC ts, time_t time)
66	{
67	int64_t t = 1000000000 * *time;
68	RTTimeSpecSetNano (ts, t);
69	}
70	#else /* >= 2.6.0 */
71	static void
72	sf_ftime_from_timespec (struct timespec tv, RTTIMESPEC ts)
73	{
74	int64_t t = RTTimeSpecGetNano (ts);
75	int64_t nsec;
76
77	nsec = do_div (t, 1000000000);
78	tv->tv_sec = t;
79	tv->tv_nsec = nsec;
80	}
81
82	static void
83	sf_timespec_from_ftime (RTTIMESPEC ts, struct timespec tv)
84	{
85	int64_t t = (int64_t)tv->tv_nsec + (int64_t)tv->tv_sec * 1000000000;
86	RTTimeSpecSetNano (ts, t);
87	}
88	#endif /* >= 2.6.0 */
89
90	/* set [inode] attributes based on [info], uid/gid based on [sf_g] */
91	void
92	sf_init_inode (struct sf_glob_info sf_g, struct inode inode,
93	RTFSOBJINFO *info)
94	{
95	int is_dir;
96	RTFSOBJATTR *attr;
97	int mode;
98
99	TRACE ();
100
101	attr = &info->Attr;
102	is_dir = RTFS_IS_DIRECTORY (attr->fMode);
103
104	#define mode_set(r) attr->fMode & (RTFS_UNIX_##r) ? (S_##r) : 0;
105	mode = mode_set (ISUID);
106	mode \|= mode_set (ISGID);
107
108	mode \|= mode_set (IRUSR);
109	mode \|= mode_set (IWUSR);
110	mode \|= mode_set (IXUSR);
111
112	mode \|= mode_set (IRGRP);
113	mode \|= mode_set (IWGRP);
114	mode \|= mode_set (IXGRP);
115
116	mode \|= mode_set (IROTH);
117	mode \|= mode_set (IWOTH);
118	mode \|= mode_set (IXOTH);
119	#undef mode_set
120
121	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 0)
122	inode->i_mapping->a_ops = &sf_reg_aops;
123	inode->i_mapping->backing_dev_info = &sf_backing_dev_info;
124	#endif
125
126	if (is_dir) {
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	inode->i_nlink = 1;
135	}
136	else {
137	inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777): mode;
138	inode->i_mode &= ~sf_g->fmask;
139	inode->i_mode \|= S_IFREG;
140	inode->i_op = &sf_reg_iops;
141	inode->i_fop = &sf_reg_fops;
142	inode->i_nlink = 1;
143	}
144
145	inode->i_uid = sf_g->uid;
146	inode->i_gid = sf_g->gid;
147	inode->i_size = info->cbObject;
148	#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 19) && !defined(KERNEL_FC6)
149	inode->i_blksize = 4096;
150	#endif
151	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 4, 11)
152	inode->i_blkbits = 12;
153	#endif
154	inode->i_blocks = (info->cbObject + 4095) / 4096;
155
156	sf_ftime_from_timespec (&inode->i_atime, &info->AccessTime);
157	sf_ftime_from_timespec (&inode->i_ctime, &info->ChangeTime);
158	sf_ftime_from_timespec (&inode->i_mtime, &info->ModificationTime);
159	}
160
161	int
162	sf_stat (const char caller, struct sf_glob_info sf_g,
163	SHFLSTRING path, RTFSOBJINFO result, int ok_to_fail)
164	{
165	int rc;
166	SHFLCREATEPARMS params;
167
168	TRACE ();
169
170	memset(&params, 0, sizeof(params));
171	params.CreateFlags = SHFL_CF_LOOKUP \| SHFL_CF_ACT_FAIL_IF_NEW;
172	LogFunc(("calling vboxCallCreate, file %s, flags %#x\n",
173	path->String.utf8, params.CreateFlags));
174	rc = vboxCallCreate (&client_handle, &sf_g->map, path, &params);
175	if (RT_FAILURE (rc)) {
176	LogFunc(("vboxCallCreate(%s) failed. caller=%s, rc=%Rrc\n",
177	path->String.utf8, rc, caller));
178	return -EPROTO;
179	}
180
181	if (params.Result != SHFL_FILE_EXISTS) {
182	if (!ok_to_fail) {
183	LogFunc(("vboxCallCreate(%s) file does not exist. caller=%s, result=%d\n",
184	path->String.utf8, params.Result, caller));
185	}
186	return -ENOENT;
187	}
188
189	*result = params.Info;
190	return 0;
191	}
192
193	/* this is called directly as iop on 2.4, indirectly as dop
194	[sf_dentry_revalidate] on 2.4/2.6, indirectly as iop through
195	[sf_getattr] on 2.6. the job is to find out whether dentry/inode is
196	still valid. the test is failed if [dentry] does not have an inode
197	or [sf_stat] is unsuccessful, otherwise we return success and
198	update inode attributes */
199	int
200	sf_inode_revalidate (struct dentry *dentry)
201	{
202	int err;
203	struct sf_glob_info *sf_g;
204	struct sf_inode_info *sf_i;
205	RTFSOBJINFO info;
206
207	TRACE ();
208	if (!dentry \|\| !dentry->d_inode) {
209	LogFunc(("no dentry(%p) or inode(%p)\n", dentry, dentry->d_inode));
210	return -EINVAL;
211	}
212
213	sf_g = GET_GLOB_INFO (dentry->d_inode->i_sb);
214	sf_i = GET_INODE_INFO (dentry->d_inode);
215
216	#if 0
217	printk ("%s called by %p:%p\n",
218	sf_i->path->String.utf8,
219	__builtin_return_address (0),
220	__builtin_return_address (1));
221	#endif
222
223	BUG_ON (!sf_g);
224	BUG_ON (!sf_i);
225
226	if (!sf_i->force_restat) {
227	if (jiffies - dentry->d_time < sf_g->ttl) {
228	return 0;
229	}
230	}
231
232	err = sf_stat (__func__, sf_g, sf_i->path, &info, 1);
233	if (err) {
234	return err;
235	}
236
237	dentry->d_time = jiffies;
238	sf_init_inode (sf_g, dentry->d_inode, &info);
239	return 0;
240	}
241
242	/* this is called during name resolution/lookup to check if the
243	[dentry] in the cache is still valid. the job is handled by
244	[sf_inode_revalidate] */
245	static int
246	#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
247	sf_dentry_revalidate (struct dentry *dentry, int flags)
248	#else
249	sf_dentry_revalidate (struct dentry dentry, struct nameidata nd)
250	#endif
251	{
252	TRACE ();
253	if (sf_inode_revalidate (dentry)) {
254	return 0;
255	}
256	return 1;
257	}
258
259	/* on 2.6 this is a proxy for [sf_inode_revalidate] which (as a side
260	effect) updates inode attributes for [dentry] (given that [dentry]
261	has inode at all) from these new attributes we derive [kstat] via
262	[generic_fillattr] */
263	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 0)
264	int
265	sf_getattr (struct vfsmount mnt, struct dentry dentry, struct kstat *kstat)
266	{
267	int err;
268
269	TRACE ();
270	err = sf_inode_revalidate (dentry);
271	if (err) {
272	return err;
273	}
274
275	generic_fillattr (dentry->d_inode, kstat);
276	return 0;
277	}
278
279	int
280	sf_setattr (struct dentry dentry, struct iattr iattr)
281	{
282	struct sf_glob_info *sf_g;
283	struct sf_inode_info *sf_i;
284	SHFLCREATEPARMS params;
285	RTFSOBJINFO info;
286	uint32_t cbBuffer;
287	int rc, err;
288
289	TRACE ();
290
291	sf_g = GET_GLOB_INFO (dentry->d_inode->i_sb);
292	sf_i = GET_INODE_INFO (dentry->d_inode);
293	err = 0;
294
295	memset(&params, 0, sizeof(params));
296
297	params.CreateFlags = SHFL_CF_ACT_OPEN_IF_EXISTS
298	\| SHFL_CF_ACT_FAIL_IF_NEW
299	\| SHFL_CF_ACCESS_ATTR_WRITE;
300
301	rc = vboxCallCreate (&client_handle, &sf_g->map, sf_i->path, &params);
302	if (VBOX_FAILURE (rc)) {
303	LogFunc(("vboxCallCreate(%s) failed rc=%Rrc\n",
304	sf_i->path->String.utf8, rc));
305	err = -RTErrConvertToErrno(rc);
306	goto fail2;
307	}
308	if (params.Result != SHFL_FILE_EXISTS) {
309	LogFunc(("file %s does not exist\n", sf_i->path->String.utf8));
310	err = -ENOENT;
311	goto fail1;
312	}
313
314	/* Setting the file size and setting the other attributes has to be
315	* handled separately, see implementation of vbsfSetFSInfo() in
316	* vbsf.cpp */
317	if (iattr->ia_valid & (ATTR_MODE \| ATTR_ATIME \| ATTR_MTIME))
318	{
319	#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? RTFS_UNIX_##r : 0)
320
321	memset(&info, 0, sizeof(info));
322	if (iattr->ia_valid & ATTR_MODE)
323	{
324	info.Attr.fMode = mode_set (ISUID);
325	info.Attr.fMode \|= mode_set (ISGID);
326	info.Attr.fMode \|= mode_set (IRUSR);
327	info.Attr.fMode \|= mode_set (IWUSR);
328	info.Attr.fMode \|= mode_set (IXUSR);
329	info.Attr.fMode \|= mode_set (IRGRP);
330	info.Attr.fMode \|= mode_set (IWGRP);
331	info.Attr.fMode \|= mode_set (IXGRP);
332	info.Attr.fMode \|= mode_set (IROTH);
333	info.Attr.fMode \|= mode_set (IWOTH);
334	info.Attr.fMode \|= mode_set (IXOTH);
335
336	if (iattr->ia_mode & S_IFDIR)
337	info.Attr.fMode \|= RTFS_TYPE_DIRECTORY;
338	else
339	info.Attr.fMode \|= RTFS_TYPE_FILE;
340	}
341
342	if (iattr->ia_valid & ATTR_ATIME)
343	sf_timespec_from_ftime (&info.AccessTime, &iattr->ia_atime);
344	if (iattr->ia_valid & ATTR_MTIME)
345	sf_timespec_from_ftime (&info.ModificationTime, &iattr->ia_mtime);
346	/* ignore ctime (inode change time) as it can't be set from userland anyway */
347
348	cbBuffer = sizeof(info);
349	rc = vboxCallFSInfo(&client_handle, &sf_g->map, params.Handle,
350	SHFL_INFO_SET \| SHFL_INFO_FILE, &cbBuffer,
351	(PSHFLDIRINFO)&info);
352	if (VBOX_FAILURE (rc)) {
353	LogFunc(("vboxCallFSInfo(%s, FILE) failed rc=%Rrc\n",
354	sf_i->path->String.utf8, rc));
355	err = -RTErrConvertToErrno(rc);
356	goto fail1;
357	}
358	}
359
360	if (iattr->ia_valid & ATTR_SIZE)
361	{
362	memset(&info, 0, sizeof(info));
363	info.cbObject = iattr->ia_size;
364	cbBuffer = sizeof(info);
365	rc = vboxCallFSInfo(&client_handle, &sf_g->map, params.Handle,
366	SHFL_INFO_SET \| SHFL_INFO_SIZE, &cbBuffer,
367	(PSHFLDIRINFO)&info);
368	if (VBOX_FAILURE (rc)) {
369	LogFunc(("vboxCallFSInfo(%s, SIZE) failed rc=%Rrc\n",
370	sf_i->path->String.utf8, rc));
371	err = -RTErrConvertToErrno(rc);
372	goto fail1;
373	}
374	}
375
376	rc = vboxCallClose (&client_handle, &sf_g->map, params.Handle);
377	if (VBOX_FAILURE (rc))
378	{
379	LogFunc(("vboxCallClose(%s) failed rc=%Rrc\n",
380	sf_i->path->String.utf8, rc));
381	}
382
383	return sf_inode_revalidate (dentry);
384
385	fail1:
386	rc = vboxCallClose (&client_handle, &sf_g->map, params.Handle);
387	if (VBOX_FAILURE (rc))
388	{
389	LogFunc(("vboxCallClose(%s) failed rc=%Rrc\n",
390	sf_i->path->String.utf8, rc));
391	}
392	fail2:
393	return err;
394	}
395	#endif /* >= 2.6.0 */
396
397	static int
398	sf_make_path (const char caller, struct sf_inode_info sf_i,
399	const char d_name, size_t d_len, SHFLSTRING *result)
400	{
401	size_t path_len, shflstring_len;
402	SHFLSTRING *tmp;
403	uint16_t p_len;
404	uint8_t *p_name;
405	uint8_t *dst;
406	int is_root = 0;
407
408	TRACE ();
409	p_len = sf_i->path->u16Length;
410	p_name = sf_i->path->String.utf8;
411
412	if (p_len == 1 && *p_name == '/') {
413	path_len = d_len + 1;
414	is_root = 1;
415	}
416	else {
417	/* lengths of constituents plus terminating zero plus slash */
418	path_len = p_len + d_len + 2;
419	if (path_len > 0xffff) {
420	LogFunc(("path too long. caller=%s, path_len=%zu\n", caller, path_len));
421	return -ENAMETOOLONG;
422	}
423	}
424
425	shflstring_len = offsetof (SHFLSTRING, String.utf8) + path_len;
426	tmp = kmalloc (shflstring_len, GFP_KERNEL);
427	if (!tmp) {
428	LogRelFunc(("kmalloc failed, caller=%s\n", caller));
429	return -ENOMEM;
430	}
431	tmp->u16Length = path_len - 1;
432	tmp->u16Size = path_len;
433
434	if (is_root) {
435	memcpy (tmp->String.utf8, d_name, d_len + 1);
436	}
437	else {
438	dst = tmp->String.utf8;
439	memcpy (dst, p_name, p_len);
440	dst += p_len; *dst++ = '/';
441	memcpy (dst, d_name, d_len);
442	dst[d_len] = 0;
443	}
444
445	*result = tmp;
446	return 0;
447	}
448
449	/* [dentry] contains string encoded in coding system that corresponds
450	to [sf_g]->nls, we must convert it to UTF8 here and pass down to
451	[sf_make_path] which will allocate SHFLSTRING and fill it in */
452	int
453	sf_path_from_dentry (const char caller, struct sf_glob_info sf_g,
454	struct sf_inode_info sf_i, struct dentry dentry,
455	SHFLSTRING **result)
456	{
457	int err;
458	const char *d_name;
459	size_t d_len;
460	const char *name;
461	size_t len = 0;
462
463	TRACE ();
464	d_name = dentry->d_name.name;
465	d_len = dentry->d_name.len;
466
467	if (sf_g->nls) {
468	size_t in_len, i, out_bound_len;
469	const char *in;
470	char *out;
471
472	in = d_name;
473	in_len = d_len;
474
475	out_bound_len = PATH_MAX;
476	out = kmalloc (out_bound_len, GFP_KERNEL);
477	name = out;
478
479	for (i = 0; i < d_len; ++i) {
480	/* We renamed the linux kernel wchar_t type to linux_wchar_t in
481	the-linux-kernel.h, as it conflicts with the C++ type of that name. */
482	linux_wchar_t uni;
483	int nb;
484
485	nb = sf_g->nls->char2uni (in, in_len, &uni);
486	if (nb < 0) {
487	LogFunc(("nls->char2uni failed %x %d\n",
488	*in, in_len));
489	err = -EINVAL;
490	goto fail1;
491	}
492	in_len -= nb;
493	in += nb;
494
495	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 31)
496	nb = utf32_to_utf8 (uni, out, out_bound_len);
497	#else
498	nb = utf8_wctomb (out, uni, out_bound_len);
499	#endif
500	if (nb < 0) {
501	LogFunc(("nls->uni2char failed %x %d\n",
502	uni, out_bound_len));
503	err = -EINVAL;
504	goto fail1;
505	}
506	out_bound_len -= nb;
507	out += nb;
508	len += nb;
509	}
510	if (len >= PATH_MAX - 1) {
511	err = -ENAMETOOLONG;
512	goto fail1;
513	}
514
515	LogFunc(("result(%d) = %.*s\n", len, len, name));
516	*out = 0;
517	}
518	else {
519	name = d_name;
520	len = d_len;
521	}
522
523	err = sf_make_path (caller, sf_i, name, len, result);
524	if (name != d_name) {
525	kfree (name);
526	}
527	return err;
528
529	fail1:
530	kfree (name);
531	return err;
532	}
533
534	int
535	sf_nlscpy (struct sf_glob_info *sf_g,
536	char *name, size_t name_bound_len,
537	const unsigned char *utf8_name, size_t utf8_len)
538	{
539	if (sf_g->nls) {
540	const char *in;
541	char *out;
542	size_t out_len;
543	size_t out_bound_len;
544	size_t in_bound_len;
545
546	in = utf8_name;
547	in_bound_len = utf8_len;
548
549	out = name;
550	out_len = 0;
551	out_bound_len = name_bound_len;
552
553	while (in_bound_len) {
554	int nb;
555	wchar_t uni;
556
557	#if LINUX_VERSION_CODE >= KERNEL_VERSION (2, 6, 31)
558	nb = utf8_to_utf32 (in, in_bound_len, &uni);
559	#else
560	nb = utf8_mbtowc (&uni, in, in_bound_len);
561	#endif
562	if (nb < 0) {
563	LogFunc(("utf8_mbtowc failed(%s) %x:%d\n",
564	(const char ) utf8_name, in, in_bound_len));
565	return -EINVAL;
566	}
567	in += nb;
568	in_bound_len -= nb;
569
570	nb = sf_g->nls->uni2char (uni, out, out_bound_len);
571	if (nb < 0) {
572	LogFunc(("nls->uni2char failed(%s) %x:%d\n",
573	utf8_name, uni, out_bound_len));
574	return nb;
575	}
576	out += nb;
577	out_bound_len -= nb;
578	out_len += nb;
579	}
580
581	*out = 0;
582	return 0;
583	}
584	else {
585	if (utf8_len + 1 > name_bound_len) {
586	return -ENAMETOOLONG;
587	}
588	else {
589	memcpy (name, utf8_name, utf8_len + 1);
590	}
591	return 0;
592	}
593	}
594
595	static struct sf_dir_buf *
596	sf_dir_buf_alloc (void)
597	{
598	struct sf_dir_buf *b;
599
600	TRACE ();
601	b = kmalloc (sizeof (*b), GFP_KERNEL);
602	if (!b) {
603	LogRelFunc(("could not alloc directory buffer\n"));
604	return NULL;
605	}
606
607	#ifdef USE_VMALLOC
608	b->buf = vmalloc (16384);
609	#else
610	b->buf = kmalloc (16384, GFP_KERNEL);
611	#endif
612	if (!b->buf) {
613	kfree (b);
614	LogRelFunc(("could not alloc directory buffer storage\n"));
615	return NULL;
616	}
617
618	INIT_LIST_HEAD (&b->head);
619	b->nb_entries = 0;
620	b->used_bytes = 0;
621	b->free_bytes = 16384;
622	return b;
623	}
624
625	static void
626	sf_dir_buf_free (struct sf_dir_buf *b)
627	{
628	BUG_ON (!b \|\| !b->buf);
629
630	TRACE ();
631	list_del (&b->head);
632	#ifdef USE_VMALLOC
633	vfree (b->buf);
634	#else
635	kfree (b->buf);
636	#endif
637	kfree (b);
638	}
639
640	void
641	sf_dir_info_free (struct sf_dir_info *p)
642	{
643	struct list_head list, pos, *tmp;
644
645	TRACE ();
646	list = &p->info_list;
647	list_for_each_safe (pos, tmp, list) {
648	struct sf_dir_buf *b;
649
650	b = list_entry (pos, struct sf_dir_buf, head);
651	sf_dir_buf_free (b);
652	}
653	kfree (p);
654	}
655
656	struct sf_dir_info *
657	sf_dir_info_alloc (void)
658	{
659	struct sf_dir_info *p;
660
661	TRACE ();
662	p = kmalloc (sizeof (*p), GFP_KERNEL);
663	if (!p) {
664	LogRelFunc(("could not alloc directory info\n"));
665	return NULL;
666	}
667
668	INIT_LIST_HEAD (&p->info_list);
669	return p;
670	}
671
672	static struct sf_dir_buf *
673	sf_get_non_empty_dir_buf (struct sf_dir_info *sf_d)
674	{
675	struct list_head list, pos;
676
677	list = &sf_d->info_list;
678	list_for_each (pos, list) {
679	struct sf_dir_buf *b;
680
681	b = list_entry (pos, struct sf_dir_buf, head);
682	if (!b) {
683	return NULL;
684	}
685	else {
686	if (b->free_bytes > 0) {
687	return b;
688	}
689	}
690	}
691
692	return NULL;
693	}
694
695	int
696	sf_dir_read_all (struct sf_glob_info sf_g, struct sf_inode_info sf_i,
697	struct sf_dir_info *sf_d, SHFLHANDLE handle)
698	{
699	int err;
700	SHFLSTRING *mask;
701	struct sf_dir_buf *b;
702
703	TRACE ();
704	err = sf_make_path (__func__, sf_i, "*", 1, &mask);
705	if (err) {
706	goto fail0;
707	}
708
709	b = sf_get_non_empty_dir_buf (sf_d);
710	for (;;) {
711	int rc;
712	void *buf;
713	uint32_t buf_size;
714	uint32_t nb_ents;
715
716	if (!b) {
717	b = sf_dir_buf_alloc ();
718	if (!b) {
719	err = -ENOMEM;
720	LogRelFunc(("could not alloc directory buffer\n"));
721	goto fail1;
722	}
723	}
724
725	list_add (&b->head, &sf_d->info_list);
726
727	buf = b->buf;
728	buf_size = b->free_bytes;
729
730	rc = vboxCallDirInfo (
731	&client_handle,
732	&sf_g->map,
733	handle,
734	mask,
735	0,
736	0,
737	&buf_size,
738	buf,
739	&nb_ents
740	);
741	switch (rc) {
742	case VINF_SUCCESS:
743	/* fallthrough */
744	case VERR_NO_MORE_FILES:
745	break;
746
747	case VERR_NO_TRANSLATION:
748	LogFunc(("host could not translate entry\n"));
749	/* XXX */
750	break;
751
752	default:
753	err = -RTErrConvertToErrno (rc);
754	LogFunc(("vboxCallDirInfo failed rc=%Rrc\n", rc));
755	goto fail1;
756	}
757
758	b->nb_entries += nb_ents;
759	b->free_bytes -= buf_size;
760	b->used_bytes += buf_size;
761	b = NULL;
762
763	if (RT_FAILURE (rc)) {
764	break;
765	}
766	}
767	return 0;
768
769	fail1:
770	kfree (mask);
771	fail0:
772	return err;
773	}
774
775	int sf_get_volume_info(struct super_block sb, STRUCT_STATFS stat)
776	{
777	struct sf_glob_info *sf_g;
778	SHFLVOLINFO SHFLVolumeInfo;
779	uint32_t cbBuffer;
780	int rc;
781
782	sf_g = GET_GLOB_INFO (sb);
783	cbBuffer = sizeof(SHFLVolumeInfo);
784	rc = vboxCallFSInfo(&client_handle, &sf_g->map, 0, SHFL_INFO_GET \| SHFL_INFO_VOLUME,
785	&cbBuffer, (PSHFLDIRINFO)&SHFLVolumeInfo);
786	if (RT_FAILURE(rc))
787	return -RTErrConvertToErrno(rc);
788
789	stat->f_type = NFS_SUPER_MAGIC; /* XXX vboxsf type? */
790	stat->f_bsize = SHFLVolumeInfo.ulBytesPerAllocationUnit;
791	stat->f_blocks = SHFLVolumeInfo.ullTotalAllocationBytes
792	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
793	stat->f_bfree = SHFLVolumeInfo.ullAvailableAllocationBytes
794	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
795	stat->f_bavail = SHFLVolumeInfo.ullAvailableAllocationBytes
796	/ SHFLVolumeInfo.ulBytesPerAllocationUnit;
797	stat->f_files = 1000;
798	stat->f_ffree = 1000; /* don't return 0 here since the guest may think
799	* that it is not possible to create any more files */
800	stat->f_fsid.val[0] = 0;
801	stat->f_fsid.val[1] = 0;
802	stat->f_namelen = 255;
803	return 0;
804	}
805
806	struct dentry_operations sf_dentry_ops = {
807	.d_revalidate = sf_dentry_revalidate
808	};

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source: vbox/trunk/src/VBox/Additions/linux/sharedfolders/utils.c@ 23189

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