Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / drivers / filesystems / fs_rec / reiserfs.c

diff --git a/drivers/filesystems/fs_rec/reiserfs.c b/drivers/filesystems/fs_rec/reiserfs.c
new file mode 100644 (file)
index 0000000..89bf0dc
--- /dev/null
+++ b/drivers/filesystems/fs_rec/reiserfs.c
@@ -0,0 +1,122 @@
+/*
+ * COPYRIGHT:        See COPYING in the top level directory
+ * PROJECT:          ReactOS File System Recognizer
+ * FILE:             drivers/filesystems/fs_rec/btrfs.c
+ * PURPOSE:          Btrfs Recognizer
+ * PROGRAMMER:       Peter Hater
+ *                   Pierre Schweitzer (pierre@reactos.org)
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include "fs_rec.h"
+#include "reiserfs.h"
+
+#define NDEBUG
+#include <debug.h>
+
+/* FUNCTIONS ****************************************************************/
+
+BOOLEAN
+NTAPI
+FsRecIsReiserfsVolume(IN PRFSD_SUPER_BLOCK sb)
+{
+    UCHAR sz_MagicKey[] = REISER2FS_SUPER_MAGIC_STRING;
+    UCHAR currentChar;
+    int   i;
+
+    // If any characters read from disk don't match the expected magic key, we don't have a ReiserFS volume.   
+    for (i = 0; i < MAGIC_KEY_LENGTH; i++) 
+    { 
+        currentChar = sb->s_magic[i];
+        if (currentChar != sz_MagicKey[i])
+        {
+            return FALSE;
+        }
+    }
+
+    return TRUE;
+}
+
+NTSTATUS
+NTAPI
+FsRecReiserfsFsControl(IN PDEVICE_OBJECT DeviceObject,
+                    IN PIRP Irp)
+{
+    PIO_STACK_LOCATION Stack;
+    NTSTATUS Status;
+    PDEVICE_OBJECT MountDevice;
+    PRFSD_SUPER_BLOCK Spb = NULL;
+    ULONG SectorSize;
+    LARGE_INTEGER Offset;
+    BOOLEAN DeviceError = FALSE;
+    PAGED_CODE();
+
+    /* Get the I/O Stack and check the function type */
+    Stack = IoGetCurrentIrpStackLocation(Irp);
+    switch (Stack->MinorFunction)
+    {
+        case IRP_MN_MOUNT_VOLUME:
+
+            /* Assume failure */
+            Status = STATUS_UNRECOGNIZED_VOLUME;
+
+            /* Get the device object and request the sector size */
+            MountDevice = Stack->Parameters.MountVolume.DeviceObject;
+            if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
+            {
+                /* Try to read the superblock */
+                Offset.QuadPart = REISERFS_DISK_OFFSET_IN_BYTES;
+                if (FsRecReadBlock(MountDevice,
+                                   &Offset,
+                                   SectorSize,
+                                   SectorSize,
+                                   (PVOID)&Spb,
+                                   &DeviceError))
+                {
+                    /* Check if it's an actual BTRFS volume */
+                    if (FsRecIsReiserfsVolume(Spb))
+                    {
+                        /* It is! */
+                        Status = STATUS_FS_DRIVER_REQUIRED;
+                    }
+                }
+
+                /* Free the boot sector if we have one */
+                ExFreePool(Spb);
+            }
+            else
+            {
+                /* We have some sort of failure in the storage stack */
+                DeviceError = TRUE;
+            }
+
+            /* Check if we have an error on the stack */
+            if (DeviceError)
+            {
+                /* Was this because of a floppy? */
+                if (MountDevice->Characteristics & FILE_FLOPPY_DISKETTE)
+                {
+                    /* Let the FS try anyway */
+                    Status = STATUS_FS_DRIVER_REQUIRED;
+                }
+            }
+
+            break;
+
+        case IRP_MN_LOAD_FILE_SYSTEM:
+
+            /* Load the file system */
+            Status = FsRecLoadFileSystem(DeviceObject,
+                                         L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\reiserfs");
+            break;
+
+        default:
+
+            /* Invalid request */
+            Status = STATUS_INVALID_DEVICE_REQUEST;
+    }
+
+    /* Return Status */
+    return Status;
+}