dirops.c@ 78020

Last change on this file since 78020 was 77961, checked in by vboxsync, 6 years ago
linux/vboxsf: Don't set timestamps when changing the file size (open+O_TRUNC; ftrunctate), save a host call. Don't interpret setting mtime or changing the file size as a host file modification. bugref:9172
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 55.5 KB

Line
1	/* $Id: dirops.c 77961 2019-03-30 01:46:38Z vboxsync $ */
2	/** @file
3	* vboxsf - VBox Linux Shared Folders VFS, directory inode and file operations.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* Permission is hereby granted, free of charge, to any person
10	* obtaining a copy of this software and associated documentation
11	* files (the "Software"), to deal in the Software without
12	* restriction, including without limitation the rights to use,
13	* copy, modify, merge, publish, distribute, sublicense, and/or sell
14	* copies of the Software, and to permit persons to whom the
15	* Software is furnished to do so, subject to the following
16	* conditions:
17	*
18	* The above copyright notice and this permission notice shall be
19	* included in all copies or substantial portions of the Software.
20	*
21	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
23	* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25	* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28	* OTHER DEALINGS IN THE SOFTWARE.
29	*/
30
31
32	/*********************************************************************************************************************************
33	* Header Files *
34	*********************************************************************************************************************************/
35	#include "vfsmod.h"
36	#include <iprt/err.h>
37
38	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0)
39	# define d_in_lookup(a_pDirEntry) (d_unhashed(a_pDirEntry))
40	#endif
41
42
43
44	/**
45	* Open a directory (implements file_operations::open).
46	*
47	* @returns 0 on success, negative errno otherwise.
48	* @param inode inode
49	* @param file file
50	*/
51	static int vbsf_dir_open(struct inode inode, struct file file)
52	{
53	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(inode->i_sb);
54	struct vbsf_inode_info *sf_i = VBSF_GET_INODE_INFO(inode);
55	struct dentry *dentry = VBSF_GET_F_DENTRY(file);
56	struct vbsf_dir_info *sf_d;
57	int rc;
58
59	SFLOGFLOW(("vbsf_dir_open: inode=%p file=%p %s\n", inode, file, sf_i && sf_i->path ? sf_i->path->String.ach : NULL));
60	AssertReturn(pSuperInfo, -EINVAL);
61	AssertReturn(sf_i, -EINVAL);
62	AssertReturn(!file->private_data, 0);
63
64	/*
65	* Allocate and initialize our directory info structure.
66	* We delay buffer allocation until vbsf_getdent is actually used.
67	*/
68	sf_d = kmalloc(sizeof(*sf_d), GFP_KERNEL);
69	if (sf_d) {
70	VBOXSFCREATEREQ *pReq;
71	RT_ZERO(*sf_d);
72	sf_d->u32Magic = VBSF_DIR_INFO_MAGIC;
73	sema_init(&sf_d->Lock, 1);
74
75	/*
76	* Try open the directory.
77	*/
78	pReq = (VBOXSFCREATEREQ *)VbglR0PhysHeapAlloc(RT_UOFFSETOF(VBOXSFCREATEREQ, StrPath.String) + sf_i->path->u16Size);
79	if (pReq) {
80	memcpy(&pReq->StrPath, sf_i->path, SHFLSTRING_HEADER_SIZE + sf_i->path->u16Size);
81	RT_ZERO(pReq->CreateParms);
82	pReq->CreateParms.Handle = SHFL_HANDLE_NIL;
83	pReq->CreateParms.CreateFlags = SHFL_CF_DIRECTORY
84	\| SHFL_CF_ACT_OPEN_IF_EXISTS
85	\| SHFL_CF_ACT_FAIL_IF_NEW
86	\| SHFL_CF_ACCESS_READ;
87
88	LogFunc(("calling VbglR0SfHostReqCreate on folder %s, flags %#x\n",
89	sf_i->path->String.utf8, pReq->CreateParms.CreateFlags));
90	rc = VbglR0SfHostReqCreate(pSuperInfo->map.root, pReq);
91	if (RT_SUCCESS(rc)) {
92	if (pReq->CreateParms.Result == SHFL_FILE_EXISTS) {
93	Assert(pReq->CreateParms.Handle != SHFL_HANDLE_NIL);
94
95	/*
96	* Update the inode info with fresh stats and increase the TTL for the
97	* dentry cache chain that got us here.
98	*/
99	vbsf_update_inode(inode, sf_i, &pReq->CreateParms.Info, pSuperInfo,
100	true /fLocked/ /** @todo inode locking /, 0 /fSetAttrs*/);
101	vbsf_dentry_chain_increase_ttl(dentry);
102
103	sf_d->Handle.hHost = pReq->CreateParms.Handle;
104	sf_d->Handle.cRefs = 1;
105	sf_d->Handle.fFlags = VBSF_HANDLE_F_READ \| VBSF_HANDLE_F_DIR \| VBSF_HANDLE_F_MAGIC;
106	vbsf_handle_append(sf_i, &sf_d->Handle);
107
108	file->private_data = sf_d;
109	VbglR0PhysHeapFree(pReq);
110	SFLOGFLOW(("vbsf_dir_open(%p,%p): returns 0; hHost=%#llx\n", inode, file, sf_d->Handle.hHost));
111	return 0;
112
113	}
114	Assert(pReq->CreateParms.Handle == SHFL_HANDLE_NIL);
115
116	/*
117	* Directory does not exist, so we probably got some invalid
118	* dir cache and inode info.
119	*/
120	/** @todo do more to invalidate dentry and inode here. */
121	vbsf_dentry_invalidate_ttl(dentry);
122	sf_i->force_restat = true;
123	rc = -ENOENT;
124	} else
125	rc = -EPERM;
126	VbglR0PhysHeapFree(pReq);
127	} else {
128	LogRelMaxFunc(64, ("failed to allocate %zu bytes for '%s'\n",
129	RT_UOFFSETOF(VBOXSFCREATEREQ, StrPath.String) + sf_i->path->u16Size, sf_i->path->String.ach));
130	rc = -ENOMEM;
131	}
132	sf_d->u32Magic = VBSF_DIR_INFO_MAGIC_DEAD;
133	kfree(sf_d);
134	} else
135	rc = -ENOMEM;
136	SFLOGFLOW(("vbsf_dir_open(%p,%p): returns %d\n", inode, file, rc));
137	return rc;
138	}
139
140
141	/**
142	* This is called when reference count of [file] goes to zero. Notify
143	* the host that it can free whatever is associated with this directory
144	* and deallocate our own internal buffers
145	*
146	* @param inode inode
147	* @param file file
148	* returns 0 on success, Linux error code otherwise
149	*/
150	static int vbsf_dir_release(struct inode inode, struct file file)
151	{
152	struct vbsf_dir_info sf_d = (struct vbsf_dir_info )file->private_data;
153
154	SFLOGFLOW(("vbsf_dir_release(%p,%p): sf_d=%p hHost=%#llx\n", inode, file, sf_d, sf_d ? sf_d->Handle.hHost : SHFL_HANDLE_NIL));
155
156	if (sf_d) {
157	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(inode->i_sb);
158
159	/* Invalidate the non-handle part. */
160	sf_d->u32Magic = VBSF_DIR_INFO_MAGIC_DEAD;
161	sf_d->cEntriesLeft = 0;
162	sf_d->cbValid = 0;
163	sf_d->pEntry = NULL;
164	sf_d->fNoMoreFiles = false;
165	if (sf_d->pBuf) {
166	kfree(sf_d->pBuf);
167	sf_d->pBuf = NULL;
168	}
169
170	/* Closes the handle and frees the structure when the last reference is released. */
171	vbsf_handle_release(&sf_d->Handle, pSuperInfo, "vbsf_dir_release");
172	}
173
174	return 0;
175	}
176
177
178	/**
179	* Translate RTFMODE into DT_xxx (in conjunction to rtDirType()).
180	* returns d_type
181	* @param fMode file mode
182	*/
183	DECLINLINE(int) vbsf_get_d_type(RTFMODE fMode)
184	{
185	switch (fMode & RTFS_TYPE_MASK) {
186	case RTFS_TYPE_FIFO: return DT_FIFO;
187	case RTFS_TYPE_DEV_CHAR: return DT_CHR;
188	case RTFS_TYPE_DIRECTORY: return DT_DIR;
189	case RTFS_TYPE_DEV_BLOCK: return DT_BLK;
190	case RTFS_TYPE_FILE: return DT_REG;
191	case RTFS_TYPE_SYMLINK: return DT_LNK;
192	case RTFS_TYPE_SOCKET: return DT_SOCK;
193	case RTFS_TYPE_WHITEOUT: return DT_WHT;
194	}
195	return DT_UNKNOWN;
196	}
197
198
199	/**
200	* Refills the buffer with more entries.
201	*
202	* @returns 0 on success, negative errno on error,
203	*/
204	static int vbsf_dir_read_more(struct vbsf_dir_info sf_d, struct vbsf_super_info pSuperInfo, bool fRestart)
205	{
206	int rc;
207	VBOXSFLISTDIRREQ *pReq;
208
209	/*
210	* Don't call the host again if we've reached the end of the
211	* directory entries already.
212	*/
213	if (sf_d->fNoMoreFiles) {
214	if (!fRestart) {
215	SFLOGFLOW(("vbsf_dir_read_more: no more files\n"));
216	return 0;
217	}
218	sf_d->fNoMoreFiles = false;
219	}
220
221	/*
222	* Make sure we've got some kind of buffers.
223	*/
224	if (sf_d->pBuf) {
225	/* Likely, except for the first time. */
226	} else {
227	sf_d->pBuf = (PSHFLDIRINFO)kmalloc(pSuperInfo->cbDirBuf, GFP_KERNEL);
228	if (sf_d->pBuf)
229	sf_d->cbBuf = pSuperInfo->cbDirBuf;
230	else {
231	sf_d->pBuf = (PSHFLDIRINFO)kmalloc(_4K, GFP_KERNEL);
232	if (!sf_d->pBuf) {
233	LogRelMax(10, ("vbsf_dir_read_more: Failed to allocate buffer!\n"));
234	return -ENOMEM;
235	}
236	sf_d->cbBuf = _4K;
237	}
238	}
239
240	/*
241	* Allocate a request buffer.
242	*/
243	pReq = (VBOXSFLISTDIRREQ )VbglR0PhysHeapAlloc(sizeof(pReq));
244	if (pReq) {
245	rc = VbglR0SfHostReqListDirContig2x(pSuperInfo->map.root, pReq, sf_d->Handle.hHost, NULL, NIL_RTGCPHYS64,
246	fRestart ? SHFL_LIST_RESTART : SHFL_LIST_NONE,
247	sf_d->pBuf, virt_to_phys(sf_d->pBuf), sf_d->cbBuf);
248	if (RT_SUCCESS(rc)) {
249	sf_d->pEntry = sf_d->pBuf;
250	sf_d->cbValid = pReq->Parms.cb32Buffer.u.value32;
251	sf_d->cEntriesLeft = pReq->Parms.c32Entries.u.value32;
252	sf_d->fNoMoreFiles = pReq->Parms.f32More.u.value32 == 0;
253	} else {
254	sf_d->pEntry = sf_d->pBuf;
255	sf_d->cbValid = 0;
256	sf_d->cEntriesLeft = 0;
257	if (rc == VERR_NO_MORE_FILES) {
258	sf_d->fNoMoreFiles = true;
259	rc = 0;
260	} else {
261	/* In theory we could end up here with a buffer overflow, but
262	with a 4KB minimum buffer size that's very unlikely with the
263	typical filename length of today's file systems (2019). */
264	LogRelMax(16, ("vbsf_dir_read_more: VbglR0SfHostReqListDirContig2x -> %Rrc\n", rc));
265	rc = -EPROTO;
266	}
267	}
268	VbglR0PhysHeapFree(pReq);
269	} else
270	rc = -ENOMEM;
271	SFLOGFLOW(("vbsf_dir_read_more: returns %d; cbValid=%#x cEntriesLeft=%#x fNoMoreFiles=%d\n",
272	rc, sf_d->cbValid, sf_d->cEntriesLeft, sf_d->fNoMoreFiles));
273	return rc;
274	}
275
276
277	/**
278	* Helper function for when we need to convert the name, avoids wasting stack in
279	* the UTF-8 code path.
280	*/
281	DECL_NO_INLINE(static, bool) vbsf_dir_emit_nls(
282	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
283	struct dir_context *ctx,
284	# else
285	void *opaque, filldir_t filldir, loff_t offPos,
286	# endif
287	const char *pszSrcName, uint16_t cchSrcName, ino_t d_ino, int d_type,
288	struct vbsf_super_info *pSuperInfo)
289	{
290	char szDstName[NAME_MAX];
291	int rc = vbsf_nlscpy(pSuperInfo, szDstName, sizeof(szDstName), pszSrcName, cchSrcName);
292	if (rc == 0) {
293	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
294	return dir_emit(ctx, szDstName, strlen(szDstName), d_ino, d_type);
295	#else
296	return filldir(opaque, szDstName, strlen(szDstName), offPos, d_ino, d_type) == 0;
297	#endif
298	}
299
300	/* Assuming this is a buffer overflow issue, just silently skip it. */
301	SFLOGFLOW(("vbsf_dir_emit_nls: vbsf_nlscopy failed with %d for '%s'\n", rc, pszSrcName));
302	return true;
303	}
304
305
306	/**
307	* This is called when vfs wants to populate internal buffers with
308	* directory [dir]s contents. [opaque] is an argument to the
309	* [filldir]. [filldir] magically modifies it's argument - [opaque]
310	* and takes following additional arguments (which i in turn get from
311	* the host via vbsf_getdent):
312	*
313	* name : name of the entry (i must also supply it's length huh?)
314	* type : type of the entry (FILE \| DIR \| etc) (i ellect to use DT_UNKNOWN)
315	* pos : position/index of the entry
316	* ino : inode number of the entry (i fake those)
317	*
318	* [dir] contains:
319	* f_pos : cursor into the directory listing
320	* private_data : mean of communication with the host side
321	*
322	* Extract elements from the directory listing (incrementing f_pos
323	* along the way) and feed them to [filldir] until:
324	*
325	* a. there are no more entries (i.e. vbsf_getdent set done to 1)
326	* b. failure to compute fake inode number
327	* c. filldir returns an error (see comment on that)
328	*/
329	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
330	static int vbsf_dir_iterate(struct file dir, struct dir_context ctx)
331	#else
332	static int vbsf_dir_read(struct file dir, void opaque, filldir_t filldir)
333	#endif
334	{
335	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
336	loff_t offPos = ctx->pos;
337	#else
338	loff_t offPos = dir->f_pos;
339	#endif
340	struct vbsf_dir_info sf_d = (struct vbsf_dir_info )dir->private_data;
341	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(VBSF_GET_F_DENTRY(dir)->d_sb);
342	int rc;
343
344	/*
345	* Lock the directory info structures.
346	*/
347	if (RT_LIKELY(down_interruptible(&sf_d->Lock) == 0)) {
348	/* likely */
349	} else
350	return -ERESTARTSYS;
351
352	/*
353	* Any seek performed in the mean time?
354	*/
355	if (offPos == sf_d->offPos) {
356	/* likely */
357	} else {
358	/* Restart the search if iPos is lower than the current buffer position. */
359	loff_t offCurEntry = sf_d->offPos;
360	if (offPos < offCurEntry) {
361	rc = vbsf_dir_read_more(sf_d, pSuperInfo, true /fRestart/);
362	if (rc == 0)
363	offCurEntry = 0;
364	else {
365	up(&sf_d->Lock);
366	return rc;
367	}
368	}
369
370	/* Skip ahead to offPos. */
371	while (offCurEntry < offPos) {
372	uint32_t cEntriesLeft = sf_d->cEntriesLeft;
373	if ((uint64_t)(offPos - offCurEntry) >= cEntriesLeft) {
374	/* Skip the current buffer and read the next: */
375	offCurEntry += cEntriesLeft;
376	sf_d->offPos = offCurEntry;
377	sf_d->cEntriesLeft = 0;
378	rc = vbsf_dir_read_more(sf_d, pSuperInfo, false /fRestart/);
379	if (rc != 0 \|\| sf_d->cEntriesLeft == 0) {
380	up(&sf_d->Lock);
381	return rc;
382	}
383	} else {
384	do
385	{
386	PSHFLDIRINFO pEntry = sf_d->pEntry;
387	pEntry = (PSHFLDIRINFO)&pEntry->name.String.utf8[pEntry->name.u16Length];
388	AssertLogRelBreakStmt( cEntriesLeft == 1
389	\|\| (uintptr_t)pEntry - (uintptr_t)sf_d->pBuf
390	<= sf_d->cbValid - RT_UOFFSETOF(SHFLDIRINFO, name.String),
391	sf_d->cEntriesLeft = 0);
392	sf_d->cEntriesLeft = --cEntriesLeft;
393	sf_d->offPos = ++offCurEntry;
394	} while (offPos < sf_d->offPos);
395	}
396	}
397	}
398
399	/*
400	* Handle '.' and '..' specially so we get the inode numbers right.
401	* We'll skip any '.' or '..' returned by the host (included in pos,
402	* however, to simplify the above skipping code).
403	*/
404	if (offPos < 2) {
405	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
406	if (offPos == 0) {
407	if (dir_emit_dot(dir, ctx))
408	dir->f_pos = ctx->pos = sf_d->offPos = offPos = 1;
409	else {
410	up(&sf_d->Lock);
411	return 0;
412	}
413	}
414	if (offPos == 1) {
415	if (dir_emit_dotdot(dir, ctx))
416	dir->f_pos = ctx->pos = sf_d->offPos = offPos = 2;
417	else {
418	up(&sf_d->Lock);
419	return 0;
420	}
421	}
422	#else
423	if (offPos == 0) {
424	rc = filldir(opaque, ".", 1, 0, VBSF_GET_F_DENTRY(dir)->d_inode->i_ino, DT_DIR);
425	if (!rc)
426	dir->f_pos = sf_d->offPos = offPos = 1;
427	else {
428	up(&sf_d->Lock);
429	return 0;
430	}
431	}
432	if (offPos == 1) {
433	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 5)
434	rc = filldir(opaque, "..", 2, 1, parent_ino(VBSF_GET_F_DENTRY(dir)), DT_DIR);
435	# else
436	rc = filldir(opaque, "..", 2, 1, VBSF_GET_F_DENTRY(dir)->d_parent->d_inode->i_ino, DT_DIR);
437	# endif
438	if (!rc)
439	dir->f_pos = sf_d->offPos = offPos = 2;
440	else {
441	up(&sf_d->Lock);
442	return 0;
443	}
444	}
445	#endif
446	}
447
448	/*
449	* Produce stuff.
450	*/
451	Assert(offPos == sf_d->offPos);
452	for (;;) {
453	PSHFLDIRINFO pBuf;
454	PSHFLDIRINFO pEntry;
455
456	/*
457	* Do we need to read more?
458	*/
459	uint32_t cbValid = sf_d->cbValid;
460	uint32_t cEntriesLeft = sf_d->cEntriesLeft;
461	if (!cEntriesLeft) {
462	rc = vbsf_dir_read_more(sf_d, pSuperInfo, false /fRestart/);
463	if (rc == 0) {
464	cEntriesLeft = sf_d->cEntriesLeft;
465	if (!cEntriesLeft) {
466	up(&sf_d->Lock);
467	return 0;
468	}
469	cbValid = sf_d->cbValid;
470	} else {
471	up(&sf_d->Lock);
472	return rc;
473	}
474	}
475
476	/*
477	* Feed entries to the caller.
478	*/
479	pBuf = sf_d->pBuf;
480	pEntry = sf_d->pEntry;
481	do {
482	/*
483	* Validate the entry in case the host is messing with us.
484	* We're ASSUMING the host gives us a zero terminated string (UTF-8) here.
485	*/
486	uintptr_t const offEntryInBuf = (uintptr_t)pEntry - (uintptr_t)pBuf;
487	uint16_t cbSrcName;
488	uint16_t cchSrcName;
489	AssertLogRelMsgBreak(offEntryInBuf + RT_UOFFSETOF(SHFLDIRINFO, name.String) <= cbValid,
490	("%#llx + %#x vs %#x\n", offEntryInBuf, RT_UOFFSETOF(SHFLDIRINFO, name.String), cbValid));
491	cbSrcName = pEntry->name.u16Size;
492	cchSrcName = pEntry->name.u16Length;
493	AssertLogRelBreak(offEntryInBuf + RT_UOFFSETOF(SHFLDIRINFO, name.String) + cbSrcName <= cbValid);
494	AssertLogRelBreak(cchSrcName < cbSrcName);
495	AssertLogRelBreak(pEntry->name.String.ach[cchSrcName] == '\0');
496
497	/*
498	* Filter out '.' and '..' entires.
499	*/
500	if ( cchSrcName > 2
501	\|\| pEntry->name.String.ach[0] != '.'
502	\|\| ( cchSrcName == 2
503	&& pEntry->name.String.ach[1] != '.')) {
504	int const d_type = vbsf_get_d_type(pEntry->Info.Attr.fMode);
505	ino_t const d_ino = (ino_t)offPos + 0xbeef; /* very fake */
506	bool fContinue;
507	if (pSuperInfo->fNlsIsUtf8) {
508	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
509	fContinue = dir_emit(ctx, pEntry->name.String.ach, cchSrcName, d_ino, d_type);
510	#else
511	fContinue = filldir(opaque, pEntry->name.String.ach, cchSrcName, offPos, d_ino, d_type) == 0;
512	#endif
513	} else {
514	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
515	fContinue = vbsf_dir_emit_nls(ctx, pEntry->name.String.ach, cchSrcName, d_ino, d_type, pSuperInfo);
516	#else
517	fContinue = vbsf_dir_emit_nls(opaque, filldir, offPos, pEntry->name.String.ach, cchSrcName,
518	d_ino, d_type, pSuperInfo);
519	#endif
520	}
521	if (fContinue) {
522	/* likely */
523	} else {
524	sf_d->cEntriesLeft = cEntriesLeft;
525	sf_d->pEntry = pEntry;
526	sf_d->offPos = offPos;
527	up(&sf_d->Lock);
528	return 0;
529	}
530	}
531
532	/*
533	* Advance to the next entry.
534	*/
535	pEntry = (PSHFLDIRINFO)((uintptr_t)pEntry + RT_UOFFSETOF(SHFLDIRINFO, name.String) + cbSrcName);
536	offPos += 1;
537	dir->f_pos = offPos;
538	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
539	ctx->pos = offPos;
540	#endif
541	cEntriesLeft -= 1;
542	} while (cEntriesLeft > 0);
543
544	/* Done with all available entries. */
545	sf_d->offPos = offPos + cEntriesLeft;
546	sf_d->pEntry = pBuf;
547	sf_d->cEntriesLeft = 0;
548	}
549	}
550
551
552	/**
553	* Directory file operations.
554	*/
555	struct file_operations vbsf_dir_fops = {
556	.open = vbsf_dir_open,
557	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
558	.iterate_shared = vbsf_dir_iterate,
559	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
560	.iterate = vbsf_dir_iterate,
561	#else
562	.readdir = vbsf_dir_read,
563	#endif
564	.release = vbsf_dir_release,
565	.read = generic_read_dir,
566	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
567	.llseek = generic_file_llseek
568	#endif
569	};
570
571
572
573	/*********************************************************************************************************************************
574	* Directory Inode Operations *
575	*********************************************************************************************************************************/
576
577	/**
578	* Worker for vbsf_inode_lookup(), vbsf_create_worker() and
579	* vbsf_inode_instantiate().
580	*/
581	static struct inode vbsf_create_inode(struct inode parent, struct dentry *dentry, PSHFLSTRING path,
582	PSHFLFSOBJINFO pObjInfo, struct vbsf_super_info *pSuperInfo, bool fInstantiate)
583	{
584	/*
585	* Allocate memory for our additional inode info and create an inode.
586	*/
587	struct vbsf_inode_info sf_new_i = (struct vbsf_inode_info )kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
588	if (sf_new_i) {
589	ino_t iNodeNo = iunique(parent->i_sb, 16);
590	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
591	struct inode *pInode = iget_locked(parent->i_sb, iNodeNo);
592	#else
593	struct inode *pInode = iget(parent->i_sb, iNodeNo);
594	#endif
595	if (pInode) {
596	/*
597	* Initialize the two structures.
598	*/
599	#ifdef VBOX_STRICT
600	sf_new_i->u32Magic = SF_INODE_INFO_MAGIC;
601	#endif
602	sf_new_i->path = path;
603	sf_new_i->force_restat = false;
604	sf_new_i->ts_up_to_date = jiffies;
605	RTListInit(&sf_new_i->HandleList);
606	sf_new_i->handle = SHFL_HANDLE_NIL;
607
608	VBSF_SET_INODE_INFO(pInode, sf_new_i);
609	vbsf_init_inode(pInode, sf_new_i, pObjInfo, pSuperInfo);
610
611	/*
612	* Before we unlock the new inode, we may need to call d_instantiate.
613	*/
614	if (fInstantiate)
615	d_instantiate(dentry, pInode);
616	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
617	unlock_new_inode(pInode);
618	#endif
619	return pInode;
620
621	}
622	LogFunc(("iget failed\n"));
623	kfree(sf_new_i);
624	} else
625	LogRelFunc(("could not allocate memory for new inode info\n"));
626	return NULL;
627	}
628
629
630	/** Helper for vbsf_create_worker() and vbsf_inode_lookup() that wraps
631	* d_add() and setting d_op. */
632	DECLINLINE(void) vbsf_d_add_inode(struct dentry dentry, struct inode pNewInode)
633	{
634	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)
635	Assert(dentry->d_op == &vbsf_dentry_ops); /* (taken from the superblock) */
636	#else
637	dentry->d_op = &vbsf_dentry_ops;
638	#endif
639	d_add(dentry, pNewInode);
640	}
641
642
643	/**
644	* This is called when vfs failed to locate dentry in the cache. The
645	* job of this function is to allocate inode and link it to dentry.
646	* [dentry] contains the name to be looked in the [parent] directory.
647	* Failure to locate the name is not a "hard" error, in this case NULL
648	* inode is added to [dentry] and vfs should proceed trying to create
649	* the entry via other means. NULL(or "positive" pointer) ought to be
650	* returned in case of success and "negative" pointer on error
651	*/
652	static struct dentry vbsf_inode_lookup(struct inode parent, struct dentry *dentry
653	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
654	, unsigned int flags
655	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
656	, struct nameidata *nd
657	#endif
658	)
659	{
660	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(parent->i_sb);
661	struct vbsf_inode_info *sf_i = VBSF_GET_INODE_INFO(parent);
662	SHFLSTRING *path;
663	struct dentry *dret;
664	int rc;
665
666	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
667	SFLOGFLOW(("vbsf_inode_lookup: parent=%p dentry=%p flags=%#x\n", parent, dentry, flags));
668	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
669	SFLOGFLOW(("vbsf_inode_lookup: parent=%p dentry=%p nd=%p{.flags=%#x}\n", parent, dentry, nd, nd ? nd->flags : 0));
670	#else
671	SFLOGFLOW(("vbsf_inode_lookup: parent=%p dentry=%p\n", parent, dentry));
672	#endif
673
674	Assert(pSuperInfo);
675	Assert(sf_i && sf_i->u32Magic == SF_INODE_INFO_MAGIC);
676
677	/*
678	* Build the path. We'll associate the path with dret's inode on success.
679	*/
680	rc = vbsf_path_from_dentry(pSuperInfo, sf_i, dentry, &path, __func__);
681	if (rc == 0) {
682	/*
683	* Do a lookup on the host side.
684	*/
685	VBOXSFCREATEREQ pReq = (VBOXSFCREATEREQ )VbglR0PhysHeapAlloc(sizeof(*pReq) + path->u16Size);
686	if (pReq) {
687	struct inode *pInode = NULL;
688
689	RT_ZERO(*pReq);
690	memcpy(&pReq->StrPath, path, SHFLSTRING_HEADER_SIZE + path->u16Size);
691	pReq->CreateParms.Handle = SHFL_HANDLE_NIL;
692	pReq->CreateParms.CreateFlags = SHFL_CF_LOOKUP \| SHFL_CF_ACT_FAIL_IF_NEW;
693
694	LogFunc(("Calling VbglR0SfHostReqCreate on %s\n", path->String.utf8));
695	rc = VbglR0SfHostReqCreate(pSuperInfo->map.root, pReq);
696	if (RT_SUCCESS(rc)) {
697	if (pReq->CreateParms.Result == SHFL_FILE_EXISTS) {
698	/*
699	* Create an inode for the result. Since this also confirms
700	* the existence of all parent dentries, we increase their TTL.
701	*/
702	pInode = vbsf_create_inode(parent, dentry, path, &pReq->CreateParms.Info, pSuperInfo, false /fInstantiate/);
703	if (rc == 0) {
704	path = NULL; /* given to the inode */
705	dret = dentry;
706	} else
707	dret = (struct dentry *)ERR_PTR(-ENOMEM);
708	vbsf_dentry_chain_increase_parent_ttl(dentry);
709	} else if ( pReq->CreateParms.Result == SHFL_FILE_NOT_FOUND
710	\|\| pReq->CreateParms.Result == SHFL_PATH_NOT_FOUND /this probably should happen/) {
711	dret = dentry;
712	} else {
713	AssertMsgFailed(("%d\n", pReq->CreateParms.Result));
714	dret = (struct dentry *)ERR_PTR(-EPROTO);
715	}
716	} else if (rc == VERR_INVALID_NAME) {
717	dret = dentry; /* this can happen for names like 'foo' on a Windows host /
718	} else {
719	LogFunc(("VbglR0SfHostReqCreate failed on %s: %Rrc\n", path->String.utf8, rc));
720	dret = (struct dentry *)ERR_PTR(-EPROTO);
721	}
722	VbglR0PhysHeapFree(pReq);
723
724	/*
725	* When dret is set to dentry we got something to insert,
726	* though it may be negative (pInode == NULL).
727	*/
728	if (dret == dentry) {
729	vbsf_dentry_set_update_jiffies(dentry, jiffies);
730	vbsf_d_add_inode(dentry, pInode);
731	dret = NULL;
732	}
733	} else
734	dret = (struct dentry *)ERR_PTR(-ENOMEM);
735	if (path)
736	kfree(path);
737	} else
738	dret = (struct dentry *)ERR_PTR(rc);
739	return dret;
740	}
741
742
743	/**
744	* This should allocate memory for vbsf_inode_info, compute a unique inode
745	* number, get an inode from vfs, initialize inode info, instantiate
746	* dentry.
747	*
748	* @param parent inode entry of the directory
749	* @param dentry directory cache entry
750	* @param path path name. Consumed on success.
751	* @param info file information
752	* @param handle handle
753	* @returns 0 on success, Linux error code otherwise
754	*/
755	static int vbsf_inode_instantiate(struct inode parent, struct dentry dentry, PSHFLSTRING path,
756	PSHFLFSOBJINFO info, SHFLHANDLE handle)
757	{
758	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(parent->i_sb);
759	struct inode pInode = vbsf_create_inode(parent, dentry, path, info, pSuperInfo, true /fInstantiate*/);
760	if (pInode) {
761	/* Store this handle if we leave the handle open. */
762	struct vbsf_inode_info *sf_new_i = VBSF_GET_INODE_INFO(pInode);
763	sf_new_i->handle = handle;
764	return 0;
765	}
766	return -ENOMEM;
767	}
768
769
770	/**
771	* Create a new regular file / directory.
772	*
773	* @param parent inode of the directory
774	* @param dentry directory cache entry
775	* @param mode file mode
776	* @param fCreateFlags SHFL_CF_XXX.
777	* @param fStashHandle Whether the resulting handle should be stashed in
778	* the inode for a subsequent open call.
779	* @param fDoLookup Whether we're doing a lookup and need to d_add the
780	* inode we create to dentry.
781	* @param phHostFile Where to return the handle to the create file/dir.
782	* @param pfCreated Where to indicate whether the file/dir was created
783	* or not. Optional.
784	* @returns 0 on success, Linux error code otherwise
785	*/
786	static int vbsf_create_worker(struct inode parent, struct dentry dentry, umode_t mode, uint32_t fCreateFlags,
787	bool fStashHandle, bool fDoLookup, SHFLHANDLE phHostFile, bool pfCreated)
788
789	{
790	#ifdef SFLOG_ENABLED
791	const char * const pszPrefix = S_ISDIR(mode) ? "vbsf_create_worker/dir:" : "vbsf_create_worker/file:";
792	#endif
793	struct vbsf_inode_info *sf_parent_i = VBSF_GET_INODE_INFO(parent);
794	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(parent->i_sb);
795	PSHFLSTRING path;
796	int rc;
797
798	AssertReturn(sf_parent_i, -EINVAL);
799	AssertReturn(pSuperInfo, -EINVAL);
800
801	/*
802	* Build a path. We'll donate this to the inode on success.
803	*/
804	rc = vbsf_path_from_dentry(pSuperInfo, sf_parent_i, dentry, &path, __func__);
805	if (rc == 0) {
806	/*
807	* Allocate, initialize and issue the SHFL_CREATE request.
808	*/
809	/** @todo combine with vbsf_path_from_dentry? */
810	union CreateAuxReq
811	{
812	VBOXSFCREATEREQ Create;
813	VBOXSFCLOSEREQ Close;
814	} pReq = (union CreateAuxReq )VbglR0PhysHeapAlloc(RT_UOFFSETOF(VBOXSFCREATEREQ, StrPath.String) + path->u16Size);
815	if (pReq) {
816	memcpy(&pReq->Create.StrPath, path, SHFLSTRING_HEADER_SIZE + path->u16Size);
817	RT_ZERO(pReq->Create.CreateParms);
818	pReq->Create.CreateParms.Handle = SHFL_HANDLE_NIL;
819	pReq->Create.CreateParms.CreateFlags = fCreateFlags;
820	pReq->Create.CreateParms.Info.Attr.fMode = (S_ISDIR(mode) ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE)
821	\| sf_access_permissions_to_vbox(mode);
822	pReq->Create.CreateParms.Info.Attr.enmAdditional = RTFSOBJATTRADD_NOTHING;
823
824	SFLOGFLOW(("%s calling VbglR0SfHostReqCreate(%s, %#x)\n", pszPrefix, path->String.ach, pReq->Create.CreateParms.CreateFlags));
825	rc = VbglR0SfHostReqCreate(pSuperInfo->map.root, &pReq->Create);
826	if (RT_SUCCESS(rc)) {
827	SFLOGFLOW(("%s VbglR0SfHostReqCreate returned %Rrc Result=%d Handle=%#llx\n",
828	pszPrefix, rc, pReq->Create.CreateParms.Result, pReq->Create.CreateParms.Handle));
829
830	/*
831	* Work the dentry cache and inode restatting.
832	*/
833	if ( pReq->Create.CreateParms.Result == SHFL_FILE_CREATED
834	\|\| pReq->Create.CreateParms.Result == SHFL_FILE_REPLACED) {
835	vbsf_dentry_chain_increase_parent_ttl(dentry);
836	sf_parent_i->force_restat = 1;
837	} else if ( pReq->Create.CreateParms.Result == SHFL_FILE_EXISTS
838	\|\| pReq->Create.CreateParms.Result == SHFL_FILE_NOT_FOUND)
839	vbsf_dentry_chain_increase_parent_ttl(dentry);
840
841	/*
842	* If we got a handle back, we're good. Create an inode for it and return.
843	*/
844	if (pReq->Create.CreateParms.Handle != SHFL_HANDLE_NIL) {
845	struct inode *pNewInode = vbsf_create_inode(parent, dentry, path, &pReq->Create.CreateParms.Info, pSuperInfo,
846	!fDoLookup /fInstantiate/);
847	if (pNewInode) {
848	struct vbsf_inode_info *sf_new_i = VBSF_GET_INODE_INFO(pNewInode);
849	if (phHostFile) {
850	*phHostFile = pReq->Create.CreateParms.Handle;
851	pReq->Create.CreateParms.Handle = SHFL_HANDLE_NIL;
852	} else if (fStashHandle) {
853	sf_new_i->handle = pReq->Create.CreateParms.Handle;
854	pReq->Create.CreateParms.Handle = SHFL_HANDLE_NIL;
855	}
856	if (fDoLookup)
857	vbsf_d_add_inode(dentry, pNewInode);
858	path = NULL;
859	} else {
860	SFLOGFLOW(("%s vbsf_create_inode failed: -ENOMEM (path %s)\n", pszPrefix, rc, path->String.ach));
861	rc = -ENOMEM;
862	}
863	} else if (pReq->Create.CreateParms.Result == SHFL_FILE_EXISTS) {
864	/*
865	* For atomic_open (at least), we should create an inode and
866	* convert the dentry from a negative to a positive one.
867	*/
868	SFLOGFLOW(("%s SHFL_FILE_EXISTS for %s\n", pszPrefix, sf_parent_i->path->String.ach));
869	if (fDoLookup) {
870	struct inode *pNewInode = vbsf_create_inode(parent, dentry, path, &pReq->Create.CreateParms.Info,
871	pSuperInfo, false /fInstantiate/);
872	if (pNewInode)
873	vbsf_d_add_inode(dentry, pNewInode);
874	path = NULL;
875	}
876	rc = -EEXIST;
877	} else if (pReq->Create.CreateParms.Result == SHFL_FILE_NOT_FOUND) {
878	SFLOGFLOW(("%s SHFL_FILE_NOT_FOUND for %s\n", pszPrefix, sf_parent_i->path->String.ach));
879	rc = -ENOENT;
880	} else if (pReq->Create.CreateParms.Result == SHFL_PATH_NOT_FOUND) {
881	SFLOGFLOW(("%s SHFL_PATH_NOT_FOUND for %s\n", pszPrefix, sf_parent_i->path->String.ach));
882	rc = -ENOENT;
883	} else {
884	AssertMsgFailed(("result=%d creating '%s'\n", pReq->Create.CreateParms.Result, sf_parent_i->path->String.ach));
885	rc = -EPERM;
886	}
887	} else {
888	int const vrc = rc;
889	rc = -RTErrConvertToErrno(vrc);
890	SFLOGFLOW(("%s SHFL_FN_CREATE(%s) failed vrc=%Rrc rc=%d\n", pszPrefix, path->String.ach, vrc, rc));
891	}
892
893	/* Cleanups. */
894	if (pReq->Create.CreateParms.Handle != SHFL_HANDLE_NIL) {
895	AssertCompile(RTASSERT_OFFSET_OF(VBOXSFCREATEREQ, CreateParms.Handle) > sizeof(VBOXSFCLOSEREQ)); /* no aliasing issues */
896	int rc2 = VbglR0SfHostReqClose(pSuperInfo->map.root, &pReq->Close, pReq->Create.CreateParms.Handle);
897	if (RT_FAILURE(rc2))
898	SFLOGFLOW(("%s VbglR0SfHostReqCloseSimple failed rc=%Rrc\n", pszPrefix, rc2));
899	}
900	VbglR0PhysHeapFree(pReq);
901	} else
902	rc = -ENOMEM;
903	if (path)
904	kfree(path);
905	}
906	return rc;
907	}
908
909
910	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
911	/**
912	* More atomic way of handling creation.
913	*
914	* Older kernels would first to a lookup that created the file, followed by
915	* an open call. We've got this horrid vbsf_inode_info::handle member because
916	* of that approach. The call combines the lookup and open.
917	*/
918	static int vbsf_inode_atomic_open(struct inode pDirInode, struct dentry dentry, struct file *file, unsigned fOpen,
919	umode_t fMode
920	# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0)
921	, int *opened
922	# endif
923	)
924	{
925	SFLOGFLOW(("vbsf_inode_atomic_open: pDirInode=%p dentry=%p file=%p fOpen=%#x, fMode=%#x\n", pDirInode, dentry, file, fOpen, fMode));
926	int rc;
927
928	/* Code assumes negative dentry. */
929	Assert(dentry->d_inode == NULL);
930
931	/** @todo see if we can do this for non-create calls too, as it may save us a
932	* host call to revalidate the dentry. (Can't see anyone else doing
933	* this, so playing it safe for now.) */
934	if (fOpen & O_CREAT) {
935	/*
936	* Prepare our file info structure.
937	*/
938	struct vbsf_reg_info sf_r = kmalloc(sizeof(sf_r), GFP_KERNEL);
939	if (sf_r) {
940	bool fCreated = false;
941	uint32_t fCreateFlags;
942
943	RTListInit(&sf_r->Handle.Entry);
944	sf_r->Handle.cRefs = 1;
945	sf_r->Handle.fFlags = !(fOpen & O_DIRECTORY)
946	? VBSF_HANDLE_F_FILE \| VBSF_HANDLE_F_MAGIC
947	: VBSF_HANDLE_F_DIR \| VBSF_HANDLE_F_MAGIC;
948	sf_r->Handle.hHost = SHFL_HANDLE_NIL;
949
950	/*
951	* Try create it.
952	*/
953	/* vbsf_create_worker uses the type from fMode, so match it up to O_DIRECTORY. */
954	AssertMsg(!(fMode & S_IFMT) \|\| (fMode & S_IFMT) == (fOpen & O_DIRECTORY ? S_IFDIR : S_IFREG), ("0%o\n", fMode));
955	if (!(fOpen & O_DIRECTORY))
956	fMode = (fMode & ~S_IFMT) \| S_IFREG;
957	else
958	fMode = (fMode & ~S_IFMT) \| S_IFDIR;
959
960	fCreateFlags = vbsf_linux_oflags_to_vbox(fOpen, &sf_r->Handle.fFlags, __FUNCTION__);
961
962	rc = vbsf_create_worker(pDirInode, dentry, fMode, fCreateFlags, false /fStashHandle/, true /fDoLookup/,
963	&sf_r->Handle.hHost, &fCreated);
964	if (rc == 0) {
965	struct inode *inode = dentry->d_inode;
966	struct vbsf_inode_info *sf_i = VBSF_GET_INODE_INFO(inode);
967
968	/*
969	* Set FMODE_CREATED according to the action taken by SHFL_CREATE
970	* and call finish_open() to do the remaining open() work.
971	*/
972	# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
973	if (fCreated)
974	file->f_mode \|= FMODE_CREATED;
975	rc = finish_open(file, dentry, generic_file_open);
976	# else
977	if (fCreated)
978	*opened \|= FILE_CREATED;
979	rc = finish_open(file, dentry, generic_file_open, opened);
980	# endif
981	if (rc == 0) {
982	/*
983	* Now that the file is fully opened, associate sf_r with it
984	* and link the handle to the inode.
985	*/
986	vbsf_handle_append(sf_i, &sf_r->Handle);
987	file->private_data = sf_r;
988	SFLOGFLOW(("vbsf_inode_atomic_open: create succeeded; hHost=%#llx path='%s'\n",
989	rc, sf_r->Handle.hHost, sf_i->path->String.ach));
990	sf_r = NULL; /* don't free it */
991	} else {
992	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(pDirInode->i_sb);
993	SFLOGFLOW(("vbsf_inode_atomic_open: finish_open failed: %d (path='%s'\n", rc, sf_i->path->String.ach));
994	VbglR0SfHostReqCloseSimple(pSuperInfo->map.root, sf_r->Handle.hHost);
995	sf_r->Handle.hHost = SHFL_HANDLE_NIL;
996	}
997	} else
998	SFLOGFLOW(("vbsf_inode_atomic_open: vbsf_create_worker failed: %d\n", rc));
999	if (sf_r)
1000	kfree(sf_r);
1001	} else {
1002	LogRelMaxFunc(64, ("could not allocate reg info\n"));
1003	rc = -ENOMEM;
1004	}
1005	}
1006	/*
1007	* Not creating anything.
1008	* Do we need to do a lookup or should we just fail?
1009	*/
1010	else if (d_in_lookup(dentry)) {
1011	struct dentry pResult = vbsf_inode_lookup(pDirInode, dentry, 0 /fFlags*/);
1012	if (!IS_ERR(pResult))
1013	rc = finish_no_open(file, pResult);
1014	else
1015	rc = PTR_ERR(pResult);
1016	SFLOGFLOW(("vbsf_inode_atomic_open: open -> %d (%p)\n", rc, pResult));
1017	} else {
1018	SFLOGFLOW(("vbsf_inode_atomic_open: open -> -ENOENT\n"));
1019	rc = -ENOENT;
1020	}
1021	return rc;
1022	}
1023	#endif /* 3.6.0 */
1024
1025
1026	/**
1027	* Create a new regular file.
1028	*
1029	* @param parent inode of the directory
1030	* @param dentry directory cache entry
1031	* @param mode file mode
1032	* @param excl Possible O_EXCL...
1033	* @returns 0 on success, Linux error code otherwise
1034	*/
1035	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0) \|\| defined(DOXYGEN_RUNNING)
1036	static int vbsf_inode_create(struct inode parent, struct dentry dentry, umode_t mode, bool excl)
1037	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0)
1038	static int vbsf_inode_create(struct inode parent, struct dentry dentry, umode_t mode, struct nameidata *nd)
1039	#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 75)
1040	static int vbsf_inode_create(struct inode parent, struct dentry dentry, int mode, struct nameidata *nd)
1041	#else
1042	static int vbsf_inode_create(struct inode parent, struct dentry dentry, int mode)
1043	#endif
1044	{
1045	uint32_t fCreateFlags = SHFL_CF_ACT_CREATE_IF_NEW
1046	\| SHFL_CF_ACT_FAIL_IF_EXISTS
1047	\| SHFL_CF_ACCESS_READWRITE;
1048	#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0) && LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 75)
1049	/* Clear the RD flag if write-only access requested. Otherwise assume we
1050	need write access to create stuff. */
1051	if (!(nd->intent.open.flags & 1) ) {
1052	fCreateFlags &= SHFL_CF_ACCESS_READWRITE;
1053	fCreateFlags \|= SHFL_CF_ACCESS_WRITE;
1054	}
1055	/* (file since 2.6.15) */
1056	#endif
1057	TRACE();
1058	AssertMsg(!(mode & S_IFMT) \|\| (mode & S_IFMT) == S_IFREG, ("0%o\n", mode));
1059	return vbsf_create_worker(parent, dentry, (mode & ~S_IFMT) \| S_IFREG, fCreateFlags,
1060	true /fStashHandle/, false /fDoLookup/, NULL /phHandle/, NULL /fCreated/);
1061	}
1062
1063
1064	/**
1065	* Create a new directory.
1066	*
1067	* @param parent inode of the directory
1068	* @param dentry directory cache entry
1069	* @param mode file mode
1070	* @returns 0 on success, Linux error code otherwise
1071	*/
1072	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0)
1073	static int vbsf_inode_mkdir(struct inode parent, struct dentry dentry, umode_t mode)
1074	#else
1075	static int vbsf_inode_mkdir(struct inode parent, struct dentry dentry, int mode)
1076	#endif
1077	{
1078	TRACE();
1079	AssertMsg(!(mode & S_IFMT) \|\| (mode & S_IFMT) == S_IFDIR, ("0%o\n", mode));
1080	return vbsf_create_worker(parent, dentry, (mode & ~S_IFMT) \| S_IFDIR,
1081	SHFL_CF_ACT_CREATE_IF_NEW
1082	\| SHFL_CF_ACT_FAIL_IF_EXISTS
1083	\| SHFL_CF_ACCESS_READWRITE
1084	\| SHFL_CF_DIRECTORY,
1085	false /fStashHandle/, false /fDoLookup/, NULL /phHandle/, NULL /fCreated/);
1086	}
1087
1088
1089	/**
1090	* Remove a regular file / directory.
1091	*
1092	* @param parent inode of the directory
1093	* @param dentry directory cache entry
1094	* @param fDirectory true if directory, false otherwise
1095	* @returns 0 on success, Linux error code otherwise
1096	*/
1097	static int vbsf_unlink_worker(struct inode parent, struct dentry dentry, int fDirectory)
1098	{
1099	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(parent->i_sb);
1100	struct vbsf_inode_info *sf_parent_i = VBSF_GET_INODE_INFO(parent);
1101	SHFLSTRING *path;
1102	int rc;
1103
1104	TRACE();
1105
1106	rc = vbsf_path_from_dentry(pSuperInfo, sf_parent_i, dentry, &path, __func__);
1107	if (!rc) {
1108	VBOXSFREMOVEREQ pReq = (VBOXSFREMOVEREQ )VbglR0PhysHeapAlloc(RT_UOFFSETOF(VBOXSFREMOVEREQ, StrPath.String)
1109	+ path->u16Size);
1110	if (pReq) {
1111	memcpy(&pReq->StrPath, path, SHFLSTRING_HEADER_SIZE + path->u16Size);
1112	uint32_t fFlags = fDirectory ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
1113	if (dentry->d_inode && ((dentry->d_inode->i_mode & S_IFLNK) == S_IFLNK))
1114	fFlags \|= SHFL_REMOVE_SYMLINK;
1115
1116	rc = VbglR0SfHostReqRemove(pSuperInfo->map.root, pReq, fFlags);
1117
1118	if (dentry->d_inode) {
1119	struct vbsf_inode_info *sf_i = VBSF_GET_INODE_INFO(dentry->d_inode);
1120	sf_i->force_restat = true;
1121	}
1122
1123	if (RT_SUCCESS(rc)) {
1124	sf_parent_i->force_restat = true; /* directory access/change time changed */
1125	rc = 0;
1126	} else if (rc == VERR_FILE_NOT_FOUND \|\| rc == VERR_PATH_NOT_FOUND) {
1127	/* Probably deleted on the host while the guest had it cached, so don't complain: */
1128	LogFunc(("(%d): VbglR0SfRemove(%s) failed rc=%Rrc; calling d_drop on %p\n",
1129	fDirectory, path->String.ach, rc, dentry));
1130	sf_parent_i->force_restat = true;
1131	d_drop(dentry);
1132	rc = 0;
1133	} else {
1134	LogFunc(("(%d): VbglR0SfRemove(%s) failed rc=%Rrc\n", fDirectory, path->String.ach, rc));
1135	rc = -RTErrConvertToErrno(rc);
1136	}
1137	VbglR0PhysHeapFree(pReq);
1138	} else
1139	rc = -ENOMEM;
1140	kfree(path);
1141	}
1142	return rc;
1143	}
1144
1145
1146	/**
1147	* Remove a regular file.
1148	*
1149	* @param parent inode of the directory
1150	* @param dentry directory cache entry
1151	* @returns 0 on success, Linux error code otherwise
1152	*/
1153	static int vbsf_inode_unlink(struct inode parent, struct dentry dentry)
1154	{
1155	TRACE();
1156	return vbsf_unlink_worker(parent, dentry, false /fDirectory/);
1157	}
1158
1159
1160	/**
1161	* Remove a directory.
1162	*
1163	* @param parent inode of the directory
1164	* @param dentry directory cache entry
1165	* @returns 0 on success, Linux error code otherwise
1166	*/
1167	static int vbsf_inode_rmdir(struct inode parent, struct dentry dentry)
1168	{
1169	TRACE();
1170	return vbsf_unlink_worker(parent, dentry, true /fDirectory/);
1171	}
1172
1173
1174	/**
1175	* Rename a regular file / directory.
1176	*
1177	* @param old_parent inode of the old parent directory
1178	* @param old_dentry old directory cache entry
1179	* @param new_parent inode of the new parent directory
1180	* @param new_dentry new directory cache entry
1181	* @param flags flags
1182	* @returns 0 on success, Linux error code otherwise
1183	*/
1184	static int vbsf_inode_rename(struct inode old_parent, struct dentry old_dentry,
1185	struct inode new_parent, struct dentry new_dentry, unsigned flags)
1186	{
1187	/*
1188	* Deal with flags.
1189	*/
1190	int rc;
1191	uint32_t fRename = (old_dentry->d_inode->i_mode & S_IFDIR ? SHFL_RENAME_DIR : SHFL_RENAME_FILE)
1192	\| SHFL_RENAME_REPLACE_IF_EXISTS;
1193	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
1194	if (!(flags & ~RENAME_NOREPLACE)) {
1195	if (flags & RENAME_NOREPLACE)
1196	fRename &= ~SHFL_RENAME_REPLACE_IF_EXISTS;
1197	#endif
1198	/*
1199	* Check that they are on the same mount.
1200	*/
1201	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(old_parent->i_sb);
1202	if (pSuperInfo == VBSF_GET_SUPER_INFO(new_parent->i_sb)) {
1203	/*
1204	* Build the new path.
1205	*/
1206	struct vbsf_inode_info *sf_new_parent_i = VBSF_GET_INODE_INFO(new_parent);
1207	PSHFLSTRING pNewPath;
1208	rc = vbsf_path_from_dentry(pSuperInfo, sf_new_parent_i, new_dentry, &pNewPath, __func__);
1209	if (rc == 0) {
1210	/*
1211	* Create and issue the rename request.
1212	*/
1213	VBOXSFRENAMEWITHSRCBUFREQ *pReq;
1214	pReq = (VBOXSFRENAMEWITHSRCBUFREQ *)VbglR0PhysHeapAlloc(RT_UOFFSETOF(VBOXSFRENAMEWITHSRCBUFREQ, StrDstPath.String)
1215	+ pNewPath->u16Size);
1216	if (pReq) {
1217	struct vbsf_inode_info *sf_file_i = VBSF_GET_INODE_INFO(old_dentry->d_inode);
1218	PSHFLSTRING pOldPath = sf_file_i->path;
1219
1220	memcpy(&pReq->StrDstPath, pNewPath, SHFLSTRING_HEADER_SIZE + pNewPath->u16Size);
1221	rc = VbglR0SfHostReqRenameWithSrcContig(pSuperInfo->map.root, pReq, pOldPath, virt_to_phys(pOldPath), fRename);
1222	VbglR0PhysHeapFree(pReq);
1223	if (RT_SUCCESS(rc)) {
1224	/*
1225	* On success we replace the path in the inode and trigger
1226	* restatting of both parent directories.
1227	*/
1228	struct vbsf_inode_info *sf_old_parent_i = VBSF_GET_INODE_INFO(old_parent);
1229	SFLOGFLOW(("vbsf_inode_rename: %s -> %s (%#x)\n", pOldPath->String.ach, pNewPath->String.ach, fRename));
1230
1231	sf_file_i->path = pNewPath;
1232	kfree(pOldPath);
1233	pNewPath = NULL;
1234
1235	sf_new_parent_i->force_restat = 1;
1236	sf_old_parent_i->force_restat = 1;
1237
1238	vbsf_dentry_chain_increase_parent_ttl(old_dentry);
1239	vbsf_dentry_chain_increase_parent_ttl(new_dentry);
1240
1241	rc = 0;
1242	} else {
1243	SFLOGFLOW(("vbsf_inode_rename: VbglR0SfHostReqRenameWithSrcContig(%s,%s,%#x) failed -> %d\n",
1244	pOldPath->String.ach, pNewPath->String.ach, fRename, rc));
1245	if (rc == VERR_IS_A_DIRECTORY \|\| rc == VERR_IS_A_FILE)
1246	vbsf_dentry_invalidate_ttl(old_dentry);
1247	rc = -RTErrConvertToErrno(rc);
1248	}
1249	} else {
1250	SFLOGFLOW(("vbsf_inode_rename: failed to allocate request (%#x bytes)\n",
1251	RT_UOFFSETOF(VBOXSFRENAMEWITHSRCBUFREQ, StrDstPath.String) + pNewPath->u16Size));
1252	rc = -ENOMEM;
1253	}
1254	if (pNewPath)
1255	kfree(pNewPath);
1256	} else
1257	SFLOGFLOW(("vbsf_inode_rename: vbsf_path_from_dentry failed: %d\n", rc));
1258	} else {
1259	SFLOGFLOW(("vbsf_inode_rename: rename with different roots (%#x vs %#x)\n",
1260	pSuperInfo->map.root, VBSF_GET_SUPER_INFO(new_parent->i_sb)->map.root));
1261	rc = -EXDEV;
1262	}
1263	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
1264	} else {
1265	SFLOGFLOW(("vbsf_inode_rename: Unsupported flags: %#x\n", flags));
1266	rc = -EINVAL;
1267	}
1268	#else
1269	RT_NOREF(flags);
1270	#endif
1271	return rc;
1272	}
1273
1274
1275	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
1276	/**
1277	* The traditional rename interface without any flags.
1278	*/
1279	static int vbsf_inode_rename_no_flags(struct inode old_parent, struct dentry old_dentry,
1280	struct inode new_parent, struct dentry new_dentry)
1281	{
1282	return vbsf_inode_rename(old_parent, old_dentry, new_parent, new_dentry, 0);
1283	}
1284	#endif
1285
1286
1287	/**
1288	* Create a symbolic link.
1289	*/
1290	static int vbsf_inode_symlink(struct inode parent, struct dentry dentry, const char *target)
1291	{
1292	/*
1293	* Turn the target into a string (contiguous physcial memory).
1294	*/
1295	/** @todo we can save a kmalloc here if we switch to embedding the target rather
1296	* than the symlink path into the request. Will require more NLS helpers. */
1297	struct vbsf_super_info *pSuperInfo = VBSF_GET_SUPER_INFO(parent->i_sb);
1298	PSHFLSTRING pTarget = NULL;
1299	int rc = vbsf_nls_to_shflstring(pSuperInfo, target, &pTarget);
1300	if (rc == 0) {
1301	/*
1302	* Create a full path for the symlink name.
1303	*/
1304	struct vbsf_inode_info *sf_i = VBSF_GET_INODE_INFO(parent);
1305	PSHFLSTRING pPath = NULL;
1306	rc = vbsf_path_from_dentry(pSuperInfo, sf_i, dentry, &pPath, __func__);
1307	if (rc == 0) {
1308	/*
1309	* Create the request and issue it.
1310	*/
1311	uint32_t const cbReq = RT_UOFFSETOF(VBOXSFCREATESYMLINKREQ, StrSymlinkPath.String) + pPath->u16Size;
1312	VBOXSFCREATESYMLINKREQ pReq = (VBOXSFCREATESYMLINKREQ )VbglR0PhysHeapAlloc(cbReq);
1313	if (pReq) {
1314	RT_ZERO(*pReq);
1315	memcpy(&pReq->StrSymlinkPath, pPath, SHFLSTRING_HEADER_SIZE + pPath->u16Size);
1316
1317	rc = VbglR0SfHostReqCreateSymlinkContig(pSuperInfo->map.root, pTarget, virt_to_phys(pTarget), pReq);
1318	if (RT_SUCCESS(rc)) {
1319	sf_i->force_restat = 1;
1320
1321	/*
1322	* Instantiate a new inode for the symlink.
1323	*/
1324	rc = vbsf_inode_instantiate(parent, dentry, pPath, &pReq->ObjInfo, SHFL_HANDLE_NIL);
1325	if (rc == 0) {
1326	SFLOGFLOW(("vbsf_inode_symlink: Successfully created '%s' -> '%s'\n", pPath->String.ach, pTarget->String.ach));
1327	pPath = NULL; /* consumed by inode */
1328	vbsf_dentry_chain_increase_ttl(dentry);
1329	} else {
1330	SFLOGFLOW(("vbsf_inode_symlink: Failed to create inode for '%s': %d\n", pPath->String.ach, rc));
1331	vbsf_dentry_chain_increase_parent_ttl(dentry);
1332	vbsf_dentry_invalidate_ttl(dentry);
1333	}
1334	} else {
1335	int const vrc = rc;
1336	if (vrc == VERR_WRITE_PROTECT)
1337	rc = -EPERM; /* EPERM: Symlink creation not supported according to the linux manpage as of 2017-09-15.
1338	"VBoxInternal2/SharedFoldersEnableSymlinksCreate/<share>" is not 1. */
1339	else
1340	rc = -RTErrConvertToErrno(vrc);
1341	SFLOGFLOW(("vbsf_inode_symlink: VbglR0SfHostReqCreateSymlinkContig failed for '%s' -> '%s': %Rrc (-> %d)\n",
1342	pPath->String.ach, pTarget->String.ach, vrc, rc));
1343	}
1344	VbglR0PhysHeapFree(pReq);
1345	} else {
1346	SFLOGFLOW(("vbsf_inode_symlink: failed to allocate %u phys heap for the request!\n", cbReq));
1347	rc = -ENOMEM;
1348	}
1349	if (pPath)
1350	kfree(pPath);
1351	}
1352	kfree(pTarget);
1353	}
1354	return rc;
1355	}
1356
1357
1358	/**
1359	* Directory inode operations.
1360	*/
1361	struct inode_operations vbsf_dir_iops = {
1362	.lookup = vbsf_inode_lookup,
1363	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
1364	.atomic_open = vbsf_inode_atomic_open,
1365	#endif
1366	.create = vbsf_inode_create,
1367	.symlink = vbsf_inode_symlink,
1368	.mkdir = vbsf_inode_mkdir,
1369	.rmdir = vbsf_inode_rmdir,
1370	.unlink = vbsf_inode_unlink,
1371	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
1372	.rename = vbsf_inode_rename,
1373	#else
1374	.rename = vbsf_inode_rename_no_flags,
1375	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
1376	.rename2 = vbsf_inode_rename,
1377	# endif
1378	#endif
1379	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 18)
1380	.getattr = vbsf_inode_getattr,
1381	#else
1382	.revalidate = vbsf_inode_revalidate,
1383	#endif
1384	.setattr = vbsf_inode_setattr,
1385	};
1386

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Additions/linux/sharedfolders/dirops.c@ 78020

Download in other formats: