[FASTFAT] Fix size checking in VfatGetFileNameInformation()
[reactos.git] / drivers / filesystems / fs_rec / reiserfs.c
1 /*
2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS File System Recognizer
4 * FILE: drivers/filesystems/fs_rec/btrfs.c
5 * PURPOSE: Btrfs Recognizer
6 * PROGRAMMER: Peter Hater
7 * Pierre Schweitzer (pierre@reactos.org)
8 */
9
10 /* INCLUDES *****************************************************************/
11
12 #include "fs_rec.h"
13 #include "reiserfs.h"
14
15 #define NDEBUG
16 #include <debug.h>
17
18 /* FUNCTIONS ****************************************************************/
19
20 BOOLEAN
21 NTAPI
22 FsRecIsReiserfsVolume(IN PRFSD_SUPER_BLOCK sb)
23 {
24 UCHAR sz_MagicKey[] = REISER2FS_SUPER_MAGIC_STRING;
25 UCHAR currentChar;
26 int i;
27
28 // If any characters read from disk don't match the expected magic key, we don't have a ReiserFS volume.
29 for (i = 0; i < MAGIC_KEY_LENGTH; i++)
30 {
31 currentChar = sb->s_magic[i];
32 if (currentChar != sz_MagicKey[i])
33 {
34 return FALSE;
35 }
36 }
37
38 return TRUE;
39 }
40
41 NTSTATUS
42 NTAPI
43 FsRecReiserfsFsControl(IN PDEVICE_OBJECT DeviceObject,
44 IN PIRP Irp)
45 {
46 PIO_STACK_LOCATION Stack;
47 NTSTATUS Status;
48 PDEVICE_OBJECT MountDevice;
49 PRFSD_SUPER_BLOCK Spb = NULL;
50 ULONG SectorSize;
51 LARGE_INTEGER Offset;
52 BOOLEAN DeviceError = FALSE;
53 PAGED_CODE();
54
55 /* Get the I/O Stack and check the function type */
56 Stack = IoGetCurrentIrpStackLocation(Irp);
57 switch (Stack->MinorFunction)
58 {
59 case IRP_MN_MOUNT_VOLUME:
60
61 /* Assume failure */
62 Status = STATUS_UNRECOGNIZED_VOLUME;
63
64 /* Get the device object and request the sector size */
65 MountDevice = Stack->Parameters.MountVolume.DeviceObject;
66 if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
67 {
68 /* Try to read the superblock */
69 Offset.QuadPart = REISERFS_DISK_OFFSET_IN_BYTES;
70 if (FsRecReadBlock(MountDevice,
71 &Offset,
72 SectorSize,
73 SectorSize,
74 (PVOID)&Spb,
75 &DeviceError))
76 {
77 /* Check if it's an actual BTRFS volume */
78 if (FsRecIsReiserfsVolume(Spb))
79 {
80 /* It is! */
81 Status = STATUS_FS_DRIVER_REQUIRED;
82 }
83 }
84
85 /* Free the boot sector if we have one */
86 ExFreePool(Spb);
87 }
88 else
89 {
90 /* We have some sort of failure in the storage stack */
91 DeviceError = TRUE;
92 }
93
94 /* Check if we have an error on the stack */
95 if (DeviceError)
96 {
97 /* Was this because of a floppy? */
98 if (MountDevice->Characteristics & FILE_FLOPPY_DISKETTE)
99 {
100 /* Let the FS try anyway */
101 Status = STATUS_FS_DRIVER_REQUIRED;
102 }
103 }
104
105 break;
106
107 case IRP_MN_LOAD_FILE_SYSTEM:
108
109 /* Load the file system */
110 Status = FsRecLoadFileSystem(DeviceObject,
111 L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\reiserfs");
112 break;
113
114 default:
115
116 /* Invalid request */
117 Status = STATUS_INVALID_DEVICE_REQUEST;
118 }
119
120 /* Return Status */
121 return Status;
122 }