ReactOS  0.4.15-dev-5496-g599ba9c
fastio.c
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1 /* Copyright (c) Mark Harmstone 2016-17
2  *
3  * This file is part of WinBtrfs.
4  *
5  * WinBtrfs is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public Licence as published by
7  * the Free Software Foundation, either version 3 of the Licence, or
8  * (at your option) any later version.
9  *
10  * WinBtrfs is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU Lesser General Public Licence for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public Licence
16  * along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
17 
18 #include "btrfs_drv.h"
19 
21 
22 _Function_class_(FAST_IO_QUERY_BASIC_INFO)
23 static BOOLEAN __stdcall fast_query_basic_info(PFILE_OBJECT FileObject, BOOLEAN wait, PFILE_BASIC_INFORMATION fbi,
25  fcb* fcb;
26  ccb* ccb;
27 
29 
31 
32  TRACE("(%p, %u, %p, %p, %p)\n", FileObject, wait, fbi, IoStatus, DeviceObject);
33 
34  if (!FileObject) {
36  return false;
37  }
38 
39  fcb = FileObject->FsContext;
40 
41  if (!fcb) {
43  return false;
44  }
45 
46  ccb = FileObject->FsContext2;
47 
48  if (!ccb) {
50  return false;
51  }
52 
55  return false;
56  }
57 
58  if (fcb->ads) {
59  if (!ccb->fileref || !ccb->fileref->parent || !ccb->fileref->parent->fcb) {
61  return false;
62  }
63 
64  fcb = ccb->fileref->parent->fcb;
65  }
66 
67  if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
69  return false;
70  }
71 
72  if (fcb == fcb->Vcb->dummy_fcb) {
74 
76  fbi->CreationTime = fbi->LastAccessTime = fbi->LastWriteTime = fbi->ChangeTime = time;
77  } else {
82  }
83 
85 
86  IoStatus->Status = STATUS_SUCCESS;
87  IoStatus->Information = sizeof(FILE_BASIC_INFORMATION);
88 
89  ExReleaseResourceLite(fcb->Header.Resource);
90 
92 
93  return true;
94 }
95 
96 _Function_class_(FAST_IO_QUERY_STANDARD_INFO)
97 static BOOLEAN __stdcall fast_query_standard_info(PFILE_OBJECT FileObject, BOOLEAN wait, PFILE_STANDARD_INFORMATION fsi,
99  fcb* fcb;
100  ccb* ccb;
101  bool ads;
102  ULONG adssize;
103 
105 
107 
108  TRACE("(%p, %u, %p, %p, %p)\n", FileObject, wait, fsi, IoStatus, DeviceObject);
109 
110  if (!FileObject) {
112  return false;
113  }
114 
115  fcb = FileObject->FsContext;
116  ccb = FileObject->FsContext2;
117 
118  if (!fcb) {
120  return false;
121  }
122 
123  if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
125  return false;
126  }
127 
128  ads = fcb->ads;
129 
130  if (ads) {
131  struct _fcb* fcb2;
132 
133  if (!ccb || !ccb->fileref || !ccb->fileref->parent || !ccb->fileref->parent->fcb) {
134  ExReleaseResourceLite(fcb->Header.Resource);
136  return false;
137  }
138 
139  adssize = fcb->adsdata.Length;
140 
141  fcb2 = ccb->fileref->parent->fcb;
142 
143  ExReleaseResourceLite(fcb->Header.Resource);
144 
145  fcb = fcb2;
146 
147  if (!ExAcquireResourceSharedLite(fcb->Header.Resource, wait)) {
149  return false;
150  }
151 
152  fsi->AllocationSize.QuadPart = fsi->EndOfFile.QuadPart = adssize;
154  fsi->Directory = false;
155  } else {
160  }
161 
162  fsi->DeletePending = ccb->fileref ? ccb->fileref->delete_on_close : false;
163 
164  IoStatus->Status = STATUS_SUCCESS;
165  IoStatus->Information = sizeof(FILE_STANDARD_INFORMATION);
166 
167  ExReleaseResourceLite(fcb->Header.Resource);
168 
170 
171  return true;
172 }
173 
174 _Function_class_(FAST_IO_CHECK_IF_POSSIBLE)
178  fcb* fcb = FileObject->FsContext;
179  LARGE_INTEGER len2;
180 
181  UNUSED(Wait);
182  UNUSED(IoStatus);
184 
185  len2.QuadPart = Length;
186 
187  if (CheckForReadOperation) {
189  return true;
190  } else {
192  return true;
193  }
194 
195  return false;
196 }
197 
198 _Function_class_(FAST_IO_QUERY_NETWORK_OPEN_INFO)
199 static BOOLEAN __stdcall fast_io_query_network_open_info(PFILE_OBJECT FileObject, BOOLEAN Wait, FILE_NETWORK_OPEN_INFORMATION* fnoi,
201  fcb* fcb;
202  ccb* ccb;
203  file_ref* fileref;
204 
205  UNUSED(Wait);
206  UNUSED(IoStatus); // FIXME - really? What about IoStatus->Information?
208 
210 
211  TRACE("(%p, %u, %p, %p, %p)\n", FileObject, Wait, fnoi, IoStatus, DeviceObject);
212 
214 
215  fcb = FileObject->FsContext;
216 
217  if (!fcb || fcb == fcb->Vcb->volume_fcb) {
219  return false;
220  }
221 
222  ccb = FileObject->FsContext2;
223 
224  if (!ccb) {
226  return false;
227  }
228 
229  fileref = ccb->fileref;
230 
231  if (fcb == fcb->Vcb->dummy_fcb) {
233 
235  fnoi->CreationTime = fnoi->LastAccessTime = fnoi->LastWriteTime = fnoi->ChangeTime = time;
236  } else {
237  INODE_ITEM* ii;
238 
239  if (fcb->ads) {
240  if (!fileref || !fileref->parent) {
241  ERR("no fileref for stream\n");
243  return false;
244  }
245 
246  ii = &fileref->parent->fcb->inode_item;
247  } else
248  ii = &fcb->inode_item;
249 
254  }
255 
256  if (fcb->ads) {
258  fnoi->FileAttributes = fileref->parent->fcb->atts == 0 ? FILE_ATTRIBUTE_NORMAL : fileref->parent->fcb->atts;
259  } else {
263  }
264 
266 
267  return true;
268 }
269 
270 _Function_class_(FAST_IO_ACQUIRE_FOR_MOD_WRITE)
271 static NTSTATUS __stdcall fast_io_acquire_for_mod_write(PFILE_OBJECT FileObject, PLARGE_INTEGER EndingOffset,
273  fcb* fcb;
274 
276 
279 
280  fcb = FileObject->FsContext;
281 
282  if (!fcb)
284 
285  // Make sure we don't get interrupted by the flush thread, which can cause a deadlock
286 
287  if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, false))
288  return STATUS_CANT_WAIT;
289 
290  if (!ExAcquireResourceExclusiveLite(fcb->Header.Resource, false)) {
291  ExReleaseResourceLite(&fcb->Vcb->tree_lock);
292  TRACE("returning STATUS_CANT_WAIT\n");
293  return STATUS_CANT_WAIT;
294  }
295 
296  // Ideally this would be PagingIoResource, but that doesn't play well with copy-on-write,
297  // as we can't guarantee that we won't need to do any reallocations.
298 
299  *ResourceToRelease = fcb->Header.Resource;
300 
301  TRACE("returning STATUS_SUCCESS\n");
302 
303  return STATUS_SUCCESS;
304 }
305 
306 _Function_class_(FAST_IO_RELEASE_FOR_MOD_WRITE)
307 static NTSTATUS __stdcall fast_io_release_for_mod_write(PFILE_OBJECT FileObject, struct _ERESOURCE *ResourceToRelease,
309  fcb* fcb;
310 
311  TRACE("(%p, %p, %p)\n", FileObject, ResourceToRelease, DeviceObject);
312 
314 
315  fcb = FileObject->FsContext;
316 
318 
319  ExReleaseResourceLite(&fcb->Vcb->tree_lock);
320 
321  return STATUS_SUCCESS;
322 }
323 
324 _Function_class_(FAST_IO_ACQUIRE_FOR_CCFLUSH)
325 static NTSTATUS __stdcall fast_io_acquire_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
328 
330 
331  return STATUS_SUCCESS;
332 }
333 
334 _Function_class_(FAST_IO_RELEASE_FOR_CCFLUSH)
335 static NTSTATUS __stdcall fast_io_release_for_ccflush(PFILE_OBJECT FileObject, PDEVICE_OBJECT DeviceObject) {
338 
341 
342  return STATUS_SUCCESS;
343 }
344 
345 _Function_class_(FAST_IO_WRITE)
347  fcb* fcb = FileObject->FsContext;
348  bool ret;
349 
351 
352  if (!ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, Wait)) {
354  return false;
355  }
356 
358 
359  if (ret)
360  fcb->inode_item.st_size = fcb->Header.FileSize.QuadPart;
361 
362  ExReleaseResourceLite(&fcb->Vcb->tree_lock);
363 
365 
366  return ret;
367 }
368 
369 _Function_class_(FAST_IO_LOCK)
373  BOOLEAN ret;
374  fcb* fcb = FileObject->FsContext;
375 
377 
378  TRACE("(%p, %I64x, %I64x, %p, %lx, %u, %u, %p, %p)\n", FileObject, FileOffset ? FileOffset->QuadPart : 0, Length ? Length->QuadPart : 0,
380 
381  if (fcb->type != BTRFS_TYPE_FILE) {
382  WARN("can only lock files\n");
384  IoStatus->Information = 0;
385  return true;
386  }
387 
389  ExAcquireResourceSharedLite(fcb->Header.Resource, true);
390 
392  ExclusiveLock, IoStatus, NULL, false);
393 
394  if (ret)
395  fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
396 
397  ExReleaseResourceLite(fcb->Header.Resource);
399 
400  return ret;
401 }
402 
403 _Function_class_(FAST_IO_UNLOCK_SINGLE)
406  fcb* fcb = FileObject->FsContext;
407 
409 
410  TRACE("(%p, %I64x, %I64x, %p, %lx, %p, %p)\n", FileObject, FileOffset ? FileOffset->QuadPart : 0, Length ? Length->QuadPart : 0,
412 
413  IoStatus->Information = 0;
414 
415  if (fcb->type != BTRFS_TYPE_FILE) {
416  WARN("can only lock files\n");
418  return true;
419  }
420 
422 
424 
425  fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
426 
428 
429  return true;
430 }
431 
432 _Function_class_(FAST_IO_UNLOCK_ALL)
434  fcb* fcb = FileObject->FsContext;
435 
437 
438  TRACE("(%p, %p, %p, %p)\n", FileObject, ProcessId, IoStatus, DeviceObject);
439 
440  IoStatus->Information = 0;
441 
442  if (fcb->type != BTRFS_TYPE_FILE) {
443  WARN("can only lock files\n");
445  return true;
446  }
447 
449 
450  ExAcquireResourceSharedLite(fcb->Header.Resource, true);
451 
453 
454  fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
455 
456  ExReleaseResourceLite(fcb->Header.Resource);
457 
459 
460  return true;
461 }
462 
463 _Function_class_(FAST_IO_UNLOCK_ALL_BY_KEY)
464 static BOOLEAN __stdcall fast_io_unlock_all_by_key(PFILE_OBJECT FileObject, PVOID ProcessId, ULONG Key,
466  fcb* fcb = FileObject->FsContext;
467 
469 
470  TRACE("(%p, %p, %lx, %p, %p)\n", FileObject, ProcessId, Key, IoStatus, DeviceObject);
471 
472  IoStatus->Information = 0;
473 
474  if (fcb->type != BTRFS_TYPE_FILE) {
475  WARN("can only lock files\n");
477  return true;
478  }
479 
481 
482  ExAcquireResourceSharedLite(fcb->Header.Resource, true);
483 
485 
486  fcb->Header.IsFastIoPossible = fast_io_possible(fcb);
487 
488  ExReleaseResourceLite(fcb->Header.Resource);
489 
491 
492  return true;
493 }
494 
495 #ifdef __REACTOS__
496 _Function_class_(FAST_IO_ACQUIRE_FILE)
497 #endif /* __REACTOS__ */
499  fcb* fcb;
500 
501  TRACE("(%p)\n", FileObject);
502 
503  if (!FileObject)
504  return;
505 
506  fcb = FileObject->FsContext;
507 
508  if (!fcb)
509  return;
510 
511  ExAcquireResourceSharedLite(&fcb->Vcb->tree_lock, true);
512  ExAcquireResourceExclusiveLite(fcb->Header.Resource, true);
513 }
514 
515 #ifdef __REACTOS__
516 _Function_class_(FAST_IO_RELEASE_FILE)
517 #endif /* __REACTOS__ */
519  fcb* fcb;
520 
521  TRACE("(%p)\n", FileObject);
522 
523  if (!FileObject)
524  return;
525 
526  fcb = FileObject->FsContext;
527 
528  if (!fcb)
529  return;
530 
531  ExReleaseResourceLite(fcb->Header.Resource);
532  ExReleaseResourceLite(&fcb->Vcb->tree_lock);
533 }
534 
537 
539 
540  FastIoDispatch.FastIoCheckIfPossible = fast_io_check_if_possible;
542  FastIoDispatch.FastIoWrite = fast_io_write;
543  FastIoDispatch.FastIoQueryBasicInfo = fast_query_basic_info;
544  FastIoDispatch.FastIoQueryStandardInfo = fast_query_standard_info;
545  FastIoDispatch.FastIoLock = fast_io_lock;
546  FastIoDispatch.FastIoUnlockSingle = fast_io_unlock_single;
547  FastIoDispatch.FastIoUnlockAll = fast_io_unlock_all;
548  FastIoDispatch.FastIoUnlockAllByKey = fast_io_unlock_all_by_key;
551  FastIoDispatch.FastIoQueryNetworkOpenInfo = fast_io_query_network_open_info;
552  FastIoDispatch.AcquireForModWrite = fast_io_acquire_for_mod_write;
557  FastIoDispatch.ReleaseForModWrite = fast_io_release_for_mod_write;
558  FastIoDispatch.AcquireForCcFlush = fast_io_acquire_for_ccflush;
559  FastIoDispatch.ReleaseForCcFlush = fast_io_release_for_ccflush;
560 
561  *fiod = &FastIoDispatch;
562 }
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_In_ PDEVICE_OBJECT DeviceObject
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BOOLEAN NTAPI FsRtlCopyWrite(IN PFILE_OBJECT FileObject, IN PLARGE_INTEGER FileOffset, IN ULONG Length, IN BOOLEAN Wait, IN ULONG LockKey, OUT PVOID Buffer, OUT PIO_STATUS_BLOCK IoStatus, IN PDEVICE_OBJECT DeviceObject)
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#define FsRtlFastLock(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11)
Definition: fsrtlfuncs.h:1581
BOOLEAN NTAPI FsRtlFastCheckLockForWrite(IN PFILE_LOCK FileLock, IN PLARGE_INTEGER FileOffset, IN PLARGE_INTEGER Length, IN ULONG Key, IN PFILE_OBJECT FileObject, IN PVOID Process)
Definition: filelock.c:782
struct _device_extension * Vcb
Definition: btrfs_drv.h:287
LONGLONG QuadPart
Definition: typedefs.h:114
ULONG SizeOfFastIoDispatch
Definition: iotypes.h:1733
#define STATUS_CANT_WAIT
Definition: ntstatus.h:452
uint32_t st_mode
Definition: btrfs.h:295
#define FILE_BASIC_INFORMATION
Definition: disk.h:53
bool delete_on_close
Definition: btrfs_drv.h:345