dirops.c@ 75837

最後變更在這個檔案從75837是 72627,由 vboxsync 提交於 6 年前
Additions: relicence components needed for Linux shared folders to MIT. bugref:9109: Shared folders: update to match in-kernel code more closely This change makes the code on which the Linux kernel shared folder patch is based MIT-licenced, so that the version in the Linux kernel can be too. This would make it easier to move code back and forth.
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1	/** @file
2	*
3	* vboxsf -- VirtualBox Guest Additions for Linux:
4	* Directory inode and file operations
5	*/
6
7	/*
8	* Copyright (C) 2006-2018 Oracle Corporation
9	*
10	* Permission is hereby granted, free of charge, to any person
11	* obtaining a copy of this software and associated documentation
12	* files (the "Software"), to deal in the Software without
13	* restriction, including without limitation the rights to use,
14	* copy, modify, merge, publish, distribute, sublicense, and/or sell
15	* copies of the Software, and to permit persons to whom the
16	* Software is furnished to do so, subject to the following
17	* conditions:
18	*
19	* The above copyright notice and this permission notice shall be
20	* included in all copies or substantial portions of the Software.
21	*
22	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
24	* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26	* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
27	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
29	* OTHER DEALINGS IN THE SOFTWARE.
30	*/
31
32	#include "vfsmod.h"
33
34	/**
35	* Open a directory. Read the complete content into a buffer.
36	*
37	* @param inode inode
38	* @param file file
39	* @returns 0 on success, Linux error code otherwise
40	*/
41	static int sf_dir_open(struct inode inode, struct file file)
42	{
43	int rc;
44	int err;
45	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
46	struct sf_dir_info *sf_d;
47	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
48	SHFLCREATEPARMS params;
49
50	TRACE();
51	BUG_ON(!sf_g);
52	BUG_ON(!sf_i);
53
54	if (file->private_data) {
55	LogFunc(("sf_dir_open() called on already opened directory '%s'\n", sf_i->path->String.utf8));
56	return 0;
57	}
58
59	sf_d = sf_dir_info_alloc();
60	if (!sf_d) {
61	LogRelFunc(("could not allocate directory info for '%s'\n",
62	sf_i->path->String.utf8));
63	return -ENOMEM;
64	}
65
66	RT_ZERO(params);
67	params.Handle = SHFL_HANDLE_NIL;
68	params.CreateFlags = 0
69	\| SHFL_CF_DIRECTORY
70	\| SHFL_CF_ACT_OPEN_IF_EXISTS
71	\| SHFL_CF_ACT_FAIL_IF_NEW \| SHFL_CF_ACCESS_READ;
72
73	LogFunc(("sf_dir_open(): calling VbglR0SfCreate, folder %s, flags %#x\n", sf_i->path->String.utf8, params.CreateFlags));
74	rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path, &params);
75	if (RT_SUCCESS(rc)) {
76	if (params.Result == SHFL_FILE_EXISTS) {
77	err = sf_dir_read_all(sf_g, sf_i, sf_d, params.Handle);
78	if (!err)
79	file->private_data = sf_d;
80	} else
81	err = -ENOENT;
82
83	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
84	if (RT_FAILURE(rc))
85	LogFunc(("sf_dir_open(): VbglR0SfClose(%s) after err=%d failed rc=%Rrc\n", sf_i->path->String.utf8, err, rc));
86	} else
87	err = -EPERM;
88
89	if (err)
90	sf_dir_info_free(sf_d);
91
92	return err;
93	}
94
95	/**
96	* This is called when reference count of [file] goes to zero. Notify
97	* the host that it can free whatever is associated with this directory
98	* and deallocate our own internal buffers
99	*
100	* @param inode inode
101	* @param file file
102	* returns 0 on success, Linux error code otherwise
103	*/
104	static int sf_dir_release(struct inode inode, struct file file)
105	{
106	TRACE();
107
108	if (file->private_data)
109	sf_dir_info_free(file->private_data);
110
111	return 0;
112	}
113
114	/**
115	* Translate RTFMODE into DT_xxx (in conjunction to rtDirType())
116	* @param fMode file mode
117	* returns d_type
118	*/
119	static int sf_get_d_type(RTFMODE fMode)
120	{
121	int d_type;
122	switch (fMode & RTFS_TYPE_MASK) {
123	case RTFS_TYPE_FIFO:
124	d_type = DT_FIFO;
125	break;
126	case RTFS_TYPE_DEV_CHAR:
127	d_type = DT_CHR;
128	break;
129	case RTFS_TYPE_DIRECTORY:
130	d_type = DT_DIR;
131	break;
132	case RTFS_TYPE_DEV_BLOCK:
133	d_type = DT_BLK;
134	break;
135	case RTFS_TYPE_FILE:
136	d_type = DT_REG;
137	break;
138	case RTFS_TYPE_SYMLINK:
139	d_type = DT_LNK;
140	break;
141	case RTFS_TYPE_SOCKET:
142	d_type = DT_SOCK;
143	break;
144	case RTFS_TYPE_WHITEOUT:
145	d_type = DT_WHT;
146	break;
147	default:
148	d_type = DT_UNKNOWN;
149	break;
150	}
151	return d_type;
152	}
153
154	/**
155	* Extract element ([dir]->f_pos) from the directory [dir] into [d_name].
156	*
157	* @returns 0 for success, 1 for end reached, Linux error code otherwise.
158	*/
159	static int sf_getdent(struct file dir, char d_name[NAME_MAX], int d_type)
160	{
161	loff_t cur;
162	struct sf_glob_info *sf_g;
163	struct sf_dir_info *sf_d;
164	struct sf_inode_info *sf_i;
165	struct inode *inode;
166	struct list_head pos, list;
167
168	TRACE();
169
170	inode = GET_F_DENTRY(dir)->d_inode;
171	sf_i = GET_INODE_INFO(inode);
172	sf_g = GET_GLOB_INFO(inode->i_sb);
173	sf_d = dir->private_data;
174
175	BUG_ON(!sf_g);
176	BUG_ON(!sf_d);
177	BUG_ON(!sf_i);
178
179	if (sf_i->force_reread) {
180	int rc;
181	int err;
182	SHFLCREATEPARMS params;
183
184	RT_ZERO(params);
185	params.Handle = SHFL_HANDLE_NIL;
186	params.CreateFlags = 0
187	\| SHFL_CF_DIRECTORY
188	\| SHFL_CF_ACT_OPEN_IF_EXISTS
189	\| SHFL_CF_ACT_FAIL_IF_NEW \| SHFL_CF_ACCESS_READ;
190
191	LogFunc(("sf_getdent: calling VbglR0SfCreate, folder %s, flags %#x\n", sf_i->path->String.utf8, params.CreateFlags));
192	rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path,
193	&params);
194	if (RT_FAILURE(rc)) {
195	LogFunc(("VbglR0SfCreate(%s) failed rc=%Rrc\n",
196	sf_i->path->String.utf8, rc));
197	return -EPERM;
198	}
199
200	if (params.Result != SHFL_FILE_EXISTS) {
201	LogFunc(("directory %s does not exist\n",
202	sf_i->path->String.utf8));
203	sf_dir_info_free(sf_d);
204	return -ENOENT;
205	}
206
207	sf_dir_info_empty(sf_d);
208	err = sf_dir_read_all(sf_g, sf_i, sf_d, params.Handle);
209	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
210	if (RT_FAILURE(rc))
211	LogFunc(("VbglR0SfClose(%s) failed rc=%Rrc\n",
212	sf_i->path->String.utf8, rc));
213	if (err)
214	return err;
215
216	sf_i->force_reread = 0;
217	}
218
219	cur = 0;
220	list = &sf_d->info_list;
221	list_for_each(pos, list) {
222	struct sf_dir_buf *b;
223	SHFLDIRINFO *info;
224	loff_t i;
225
226	b = list_entry(pos, struct sf_dir_buf, head);
227	if (dir->f_pos >= cur + b->cEntries) {
228	cur += b->cEntries;
229	continue;
230	}
231
232	for (i = 0, info = b->buf; i < dir->f_pos - cur; ++i) {
233	size_t size;
234
235	size =
236	offsetof(SHFLDIRINFO,
237	name.String) + info->name.u16Size;
238	info = (SHFLDIRINFO *) ((uintptr_t) info + size);
239	}
240
241	*d_type = sf_get_d_type(info->Info.Attr.fMode);
242
243	return sf_nlscpy(sf_g, d_name, NAME_MAX,
244	info->name.String.utf8, info->name.u16Length);
245	}
246
247	return 1;
248	}
249
250	/**
251	* This is called when vfs wants to populate internal buffers with
252	* directory [dir]s contents. [opaque] is an argument to the
253	* [filldir]. [filldir] magically modifies it's argument - [opaque]
254	* and takes following additional arguments (which i in turn get from
255	* the host via sf_getdent):
256	*
257	* name : name of the entry (i must also supply it's length huh?)
258	* type : type of the entry (FILE \| DIR \| etc) (i ellect to use DT_UNKNOWN)
259	* pos : position/index of the entry
260	* ino : inode number of the entry (i fake those)
261	*
262	* [dir] contains:
263	* f_pos : cursor into the directory listing
264	* private_data : mean of communication with the host side
265	*
266	* Extract elements from the directory listing (incrementing f_pos
267	* along the way) and feed them to [filldir] until:
268	*
269	* a. there are no more entries (i.e. sf_getdent set done to 1)
270	* b. failure to compute fake inode number
271	* c. filldir returns an error (see comment on that)
272	*/
273	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
274	static int sf_dir_iterate(struct file dir, struct dir_context ctx)
275	#else
276	static int sf_dir_read(struct file dir, void opaque, filldir_t filldir)
277	#endif
278	{
279	TRACE();
280	for (;;) {
281	int err;
282	ino_t fake_ino;
283	loff_t sanity;
284	char d_name[NAME_MAX];
285	int d_type = DT_UNKNOWN;
286
287	err = sf_getdent(dir, d_name, &d_type);
288	switch (err) {
289	case 1:
290	return 0;
291
292	case 0:
293	break;
294
295	case -1:
296	default:
297	/* skip erroneous entry and proceed */
298	LogFunc(("sf_getdent error %d\n", err));
299	dir->f_pos += 1;
300	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
301	ctx->pos += 1;
302	#endif
303	continue;
304	}
305
306	/* d_name now contains a valid entry name */
307
308	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
309	sanity = ctx->pos + 0xbeef;
310	#else
311	sanity = dir->f_pos + 0xbeef;
312	#endif
313	fake_ino = sanity;
314	if (sanity - fake_ino) {
315	LogRelFunc(("can not compute ino\n"));
316	return -EINVAL;
317	}
318	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
319	if (!dir_emit(ctx, d_name, strlen(d_name), fake_ino, d_type)) {
320	LogFunc(("dir_emit failed\n"));
321	return 0;
322	}
323	#else
324	err =
325	filldir(opaque, d_name, strlen(d_name), dir->f_pos,
326	fake_ino, d_type);
327	if (err) {
328	LogFunc(("filldir returned error %d\n", err));
329	/* Rely on the fact that filldir returns error
330	only when it runs out of space in opaque */
331	return 0;
332	}
333	#endif
334
335	dir->f_pos += 1;
336	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
337	ctx->pos += 1;
338	#endif
339	}
340
341	BUG();
342	}
343
344	struct file_operations sf_dir_fops = {
345	.open = sf_dir_open,
346	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
347	.iterate = sf_dir_iterate,
348	#else
349	.readdir = sf_dir_read,
350	#endif
351	.release = sf_dir_release,
352	.read = generic_read_dir
353	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
354	,.llseek = generic_file_llseek
355	#endif
356	};
357
358	/* iops */
359
360	/**
361	* This is called when vfs failed to locate dentry in the cache. The
362	* job of this function is to allocate inode and link it to dentry.
363	* [dentry] contains the name to be looked in the [parent] directory.
364	* Failure to locate the name is not a "hard" error, in this case NULL
365	* inode is added to [dentry] and vfs should proceed trying to create
366	* the entry via other means. NULL(or "positive" pointer) ought to be
367	* returned in case of success and "negative" pointer on error
368	*/
369	static struct dentry sf_lookup(struct inode parent, struct dentry *dentry
370	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
371	, unsigned int flags
372	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
373	, struct nameidata *nd
374	#endif
375	)
376	{
377	int err;
378	struct sf_inode_info sf_i, sf_new_i;
379	struct sf_glob_info *sf_g;
380	SHFLSTRING *path;
381	struct inode *inode;
382	ino_t ino;
383	SHFLFSOBJINFO fsinfo;
384
385	TRACE();
386	sf_g = GET_GLOB_INFO(parent->i_sb);
387	sf_i = GET_INODE_INFO(parent);
388
389	BUG_ON(!sf_g);
390	BUG_ON(!sf_i);
391
392	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
393	if (err)
394	goto fail0;
395
396	err = sf_stat(__func__, sf_g, path, &fsinfo, 1);
397	if (err) {
398	if (err == -ENOENT) {
399	/* -ENOENT: add NULL inode to dentry so it later can be
400	created via call to create/mkdir/open */
401	kfree(path);
402	inode = NULL;
403	} else
404	goto fail1;
405	} else {
406	sf_new_i = kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
407	if (!sf_new_i) {
408	LogRelFunc(("could not allocate memory for new inode info\n"));
409	err = -ENOMEM;
410	goto fail1;
411	}
412	sf_new_i->handle = SHFL_HANDLE_NIL;
413	sf_new_i->force_reread = 0;
414
415	ino = iunique(parent->i_sb, 1);
416	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
417	inode = iget_locked(parent->i_sb, ino);
418	#else
419	inode = iget(parent->i_sb, ino);
420	#endif
421	if (!inode) {
422	LogFunc(("iget failed\n"));
423	err = -ENOMEM; /* XXX: ??? */
424	goto fail2;
425	}
426
427	SET_INODE_INFO(inode, sf_new_i);
428	sf_init_inode(sf_g, inode, &fsinfo);
429	sf_new_i->path = path;
430
431	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
432	unlock_new_inode(inode);
433	#endif
434	}
435
436	sf_i->force_restat = 0;
437	dentry->d_time = jiffies;
438	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)
439	d_set_d_op(dentry, &sf_dentry_ops);
440	#else
441	dentry->d_op = &sf_dentry_ops;
442	#endif
443	d_add(dentry, inode);
444	return NULL;
445
446	fail2:
447	kfree(sf_new_i);
448
449	fail1:
450	kfree(path);
451
452	fail0:
453	return ERR_PTR(err);
454	}
455
456	/**
457	* This should allocate memory for sf_inode_info, compute a unique inode
458	* number, get an inode from vfs, initialize inode info, instantiate
459	* dentry.
460	*
461	* @param parent inode entry of the directory
462	* @param dentry directory cache entry
463	* @param path path name
464	* @param info file information
465	* @param handle handle
466	* @returns 0 on success, Linux error code otherwise
467	*/
468	static int sf_instantiate(struct inode parent, struct dentry dentry,
469	SHFLSTRING * path, PSHFLFSOBJINFO info,
470	SHFLHANDLE handle)
471	{
472	int err;
473	ino_t ino;
474	struct inode *inode;
475	struct sf_inode_info *sf_new_i;
476	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
477
478	TRACE();
479	BUG_ON(!sf_g);
480
481	sf_new_i = kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
482	if (!sf_new_i) {
483	LogRelFunc(("could not allocate inode info.\n"));
484	err = -ENOMEM;
485	goto fail0;
486	}
487
488	ino = iunique(parent->i_sb, 1);
489	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
490	inode = iget_locked(parent->i_sb, ino);
491	#else
492	inode = iget(parent->i_sb, ino);
493	#endif
494	if (!inode) {
495	LogFunc(("iget failed\n"));
496	err = -ENOMEM;
497	goto fail1;
498	}
499
500	sf_init_inode(sf_g, inode, info);
501	sf_new_i->path = path;
502	SET_INODE_INFO(inode, sf_new_i);
503	sf_new_i->force_restat = 1;
504	sf_new_i->force_reread = 0;
505
506	d_instantiate(dentry, inode);
507
508	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
509	unlock_new_inode(inode);
510	#endif
511
512	/* Store this handle if we leave the handle open. */
513	sf_new_i->handle = handle;
514	return 0;
515
516	fail1:
517	kfree(sf_new_i);
518
519	fail0:
520	return err;
521
522	}
523
524	/**
525	* Create a new regular file / directory.
526	*
527	* @param parent inode of the directory
528	* @param dentry directory cache entry
529	* @param mode file mode
530	* @param fDirectory true if directory, false otherwise
531	* @returns 0 on success, Linux error code otherwise
532	*/
533	static int sf_create_aux(struct inode parent, struct dentry dentry,
534	umode_t mode, int fDirectory)
535	{
536	int rc, err;
537	SHFLCREATEPARMS params;
538	SHFLSTRING *path;
539	struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
540	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
541
542	TRACE();
543	BUG_ON(!sf_i);
544	BUG_ON(!sf_g);
545
546	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
547	if (err)
548	goto fail0;
549
550	RT_ZERO(params);
551	params.Handle = SHFL_HANDLE_NIL;
552	params.CreateFlags = 0
553	\| SHFL_CF_ACT_CREATE_IF_NEW
554	\| SHFL_CF_ACT_FAIL_IF_EXISTS
555	\| SHFL_CF_ACCESS_READWRITE \| (fDirectory ? SHFL_CF_DIRECTORY : 0);
556	params.Info.Attr.fMode = 0
557	\| (fDirectory ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE)
558	\| (mode & S_IRWXUGO);
559	params.Info.Attr.enmAdditional = RTFSOBJATTRADD_NOTHING;
560
561	LogFunc(("sf_create_aux: calling VbglR0SfCreate, folder %s, flags %#x\n", path->String.utf8, params.CreateFlags));
562	rc = VbglR0SfCreate(&client_handle, &sf_g->map, path, &params);
563	if (RT_FAILURE(rc)) {
564	if (rc == VERR_WRITE_PROTECT) {
565	err = -EROFS;
566	goto fail1;
567	}
568	err = -EPROTO;
569	LogFunc(("(%d): VbglR0SfCreate(%s) failed rc=%Rrc\n",
570	fDirectory, sf_i->path->String.utf8, rc));
571	goto fail1;
572	}
573
574	if (params.Result != SHFL_FILE_CREATED) {
575	err = -EPERM;
576	LogFunc(("(%d): could not create file %s result=%d\n",
577	fDirectory, sf_i->path->String.utf8, params.Result));
578	goto fail1;
579	}
580
581	err = sf_instantiate(parent, dentry, path, &params.Info,
582	fDirectory ? SHFL_HANDLE_NIL : params.Handle);
583	if (err) {
584	LogFunc(("(%d): could not instantiate dentry for %s err=%d\n",
585	fDirectory, sf_i->path->String.utf8, err));
586	goto fail2;
587	}
588
589	/*
590	* Don't close this handle right now. We assume that the same file is
591	* opened with sf_reg_open() and later closed with sf_reg_close(). Save
592	* the handle in between. Does not apply to directories. True?
593	*/
594	if (fDirectory) {
595	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
596	if (RT_FAILURE(rc))
597	LogFunc(("(%d): VbglR0SfClose failed rc=%Rrc\n",
598	fDirectory, rc));
599	}
600
601	sf_i->force_restat = 1;
602	return 0;
603
604	fail2:
605	rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
606	if (RT_FAILURE(rc))
607	LogFunc(("(%d): VbglR0SfClose failed rc=%Rrc\n", fDirectory,
608	rc));
609
610	fail1:
611	kfree(path);
612
613	fail0:
614	return err;
615	}
616
617	/**
618	* Create a new regular file.
619	*
620	* @param parent inode of the directory
621	* @param dentry directory cache entry
622	* @param mode file mode
623	* @param excl Possible O_EXCL...
624	* @returns 0 on success, Linux error code otherwise
625	*/
626	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0) \|\| defined(DOXYGEN_RUNNING)
627	static int sf_create(struct inode parent, struct dentry dentry, umode_t mode,
628	bool excl)
629	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0)
630	static int sf_create(struct inode parent, struct dentry dentry, umode_t mode,
631	struct nameidata *nd)
632	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
633	static int sf_create(struct inode parent, struct dentry dentry, int mode,
634	struct nameidata *nd)
635	#else
636	static int sf_create(struct inode parent, struct dentry dentry, int mode)
637	#endif
638	{
639	TRACE();
640	return sf_create_aux(parent, dentry, mode, 0);
641	}
642
643	/**
644	* Create a new directory.
645	*
646	* @param parent inode of the directory
647	* @param dentry directory cache entry
648	* @param mode file mode
649	* @returns 0 on success, Linux error code otherwise
650	*/
651	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0)
652	static int sf_mkdir(struct inode parent, struct dentry dentry, umode_t mode)
653	#else
654	static int sf_mkdir(struct inode parent, struct dentry dentry, int mode)
655	#endif
656	{
657	TRACE();
658	return sf_create_aux(parent, dentry, mode, 1);
659	}
660
661	/**
662	* Remove a regular file / directory.
663	*
664	* @param parent inode of the directory
665	* @param dentry directory cache entry
666	* @param fDirectory true if directory, false otherwise
667	* @returns 0 on success, Linux error code otherwise
668	*/
669	static int sf_unlink_aux(struct inode parent, struct dentry dentry,
670	int fDirectory)
671	{
672	int rc, err;
673	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
674	struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
675	SHFLSTRING *path;
676	uint32_t fFlags;
677
678	TRACE();
679	BUG_ON(!sf_g);
680
681	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
682	if (err)
683	goto fail0;
684
685	fFlags = fDirectory ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
686	if (dentry->d_inode && ((dentry->d_inode->i_mode & S_IFLNK) == S_IFLNK))
687	fFlags \|= SHFL_REMOVE_SYMLINK;
688	rc = VbglR0SfRemove(&client_handle, &sf_g->map, path, fFlags);
689	if (RT_FAILURE(rc)) {
690	LogFunc(("(%d): VbglR0SfRemove(%s) failed rc=%Rrc\n",
691	fDirectory, path->String.utf8, rc));
692	err = -RTErrConvertToErrno(rc);
693	goto fail1;
694	}
695
696	/* directory access/change time changed */
697	sf_i->force_restat = 1;
698	/* directory content changed */
699	sf_i->force_reread = 1;
700
701	err = 0;
702
703	fail1:
704	kfree(path);
705
706	fail0:
707	return err;
708	}
709
710	/**
711	* Remove a regular file.
712	*
713	* @param parent inode of the directory
714	* @param dentry directory cache entry
715	* @returns 0 on success, Linux error code otherwise
716	*/
717	static int sf_unlink(struct inode parent, struct dentry dentry)
718	{
719	TRACE();
720	return sf_unlink_aux(parent, dentry, 0);
721	}
722
723	/**
724	* Remove a directory.
725	*
726	* @param parent inode of the directory
727	* @param dentry directory cache entry
728	* @returns 0 on success, Linux error code otherwise
729	*/
730	static int sf_rmdir(struct inode parent, struct dentry dentry)
731	{
732	TRACE();
733	return sf_unlink_aux(parent, dentry, 1);
734	}
735
736	/**
737	* Rename a regular file / directory.
738	*
739	* @param old_parent inode of the old parent directory
740	* @param old_dentry old directory cache entry
741	* @param new_parent inode of the new parent directory
742	* @param new_dentry new directory cache entry
743	* @param flags flags
744	* @returns 0 on success, Linux error code otherwise
745	*/
746	static int sf_rename(struct inode old_parent, struct dentry old_dentry,
747	struct inode new_parent, struct dentry new_dentry
748	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
749	, unsigned flags
750	#endif
751	)
752	{
753	int err = 0, rc = VINF_SUCCESS;
754	struct sf_glob_info *sf_g = GET_GLOB_INFO(old_parent->i_sb);
755
756	TRACE();
757
758	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
759	if (flags) {
760	LogFunc(("rename with flags=%x\n", flags));
761	return -EINVAL;
762	}
763	#endif
764
765	if (sf_g != GET_GLOB_INFO(new_parent->i_sb)) {
766	LogFunc(("rename with different roots\n"));
767	err = -EINVAL;
768	} else {
769	struct sf_inode_info *sf_old_i = GET_INODE_INFO(old_parent);
770	struct sf_inode_info *sf_new_i = GET_INODE_INFO(new_parent);
771	/* As we save the relative path inside the inode structure, we need to change
772	this if the rename is successful. */
773	struct sf_inode_info *sf_file_i =
774	GET_INODE_INFO(old_dentry->d_inode);
775	SHFLSTRING *old_path;
776	SHFLSTRING *new_path;
777
778	BUG_ON(!sf_old_i);
779	BUG_ON(!sf_new_i);
780	BUG_ON(!sf_file_i);
781
782	old_path = sf_file_i->path;
783	err = sf_path_from_dentry(__func__, sf_g, sf_new_i,
784	new_dentry, &new_path);
785	if (err)
786	LogFunc(("failed to create new path\n"));
787	else {
788	int fDir =
789	((old_dentry->d_inode->i_mode & S_IFDIR) != 0);
790
791	rc = VbglR0SfRename(&client_handle, &sf_g->map,
792	old_path, new_path,
793	fDir ? 0 : SHFL_RENAME_FILE \|
794	SHFL_RENAME_REPLACE_IF_EXISTS);
795	if (RT_SUCCESS(rc)) {
796	kfree(old_path);
797	sf_new_i->force_restat = 1;
798	sf_old_i->force_restat = 1; /* XXX: needed? */
799	/* Set the new relative path in the inode. */
800	sf_file_i->path = new_path;
801	} else {
802	LogFunc(("VbglR0SfRename failed rc=%Rrc\n",
803	rc));
804	err = -RTErrConvertToErrno(rc);
805	kfree(new_path);
806	}
807	}
808	}
809	return err;
810	}
811
812	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
813	static int sf_symlink(struct inode parent, struct dentry dentry,
814	const char *symname)
815	{
816	int err;
817	int rc;
818	struct sf_inode_info *sf_i;
819	struct sf_glob_info *sf_g;
820	SHFLSTRING path, ssymname;
821	SHFLFSOBJINFO info;
822	int symname_len = strlen(symname) + 1;
823
824	TRACE();
825	sf_g = GET_GLOB_INFO(parent->i_sb);
826	sf_i = GET_INODE_INFO(parent);
827
828	BUG_ON(!sf_g);
829	BUG_ON(!sf_i);
830
831	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
832	if (err)
833	goto fail0;
834
835	ssymname =
836	kmalloc(offsetof(SHFLSTRING, String.utf8) + symname_len,
837	GFP_KERNEL);
838	if (!ssymname) {
839	LogRelFunc(("kmalloc failed, caller=sf_symlink\n"));
840	err = -ENOMEM;
841	goto fail1;
842	}
843
844	ssymname->u16Length = symname_len - 1;
845	ssymname->u16Size = symname_len;
846	memcpy(ssymname->String.utf8, symname, symname_len);
847
848	rc = VbglR0SfSymlink(&client_handle, &sf_g->map, path, ssymname, &info);
849	kfree(ssymname);
850
851	if (RT_FAILURE(rc)) {
852	if (rc == VERR_WRITE_PROTECT) {
853	err = -EROFS;
854	goto fail1;
855	}
856	LogFunc(("VbglR0SfSymlink(%s) failed rc=%Rrc\n",
857	sf_i->path->String.utf8, rc));
858	err = -EPROTO;
859	goto fail1;
860	}
861
862	err = sf_instantiate(parent, dentry, path, &info, SHFL_HANDLE_NIL);
863	if (err) {
864	LogFunc(("could not instantiate dentry for %s err=%d\n",
865	sf_i->path->String.utf8, err));
866	goto fail1;
867	}
868
869	sf_i->force_restat = 1;
870	return 0;
871
872	fail1:
873	kfree(path);
874	fail0:
875	return err;
876	}
877	#endif
878
879	struct inode_operations sf_dir_iops = {
880	.lookup = sf_lookup,
881	.create = sf_create,
882	.mkdir = sf_mkdir,
883	.rmdir = sf_rmdir,
884	.unlink = sf_unlink,
885	.rename = sf_rename,
886	#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
887	.revalidate = sf_inode_revalidate
888	#else
889	.getattr = sf_getattr,
890	.setattr = sf_setattr,
891	.symlink = sf_symlink
892	#endif
893	};

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source: vbox/trunk/src/VBox/Additions/linux/sharedfolders/dirops.c@ 75837

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