2 * device.h - Exports for low level device io. Part of the Linux-NTFS project.
4 * Copyright (c) 2003 Anton Altaparmakov
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program/include file is distributed in the hope that it will be
12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program (in the main directory of the Linux-NTFS
18 * distribution in the file COPYING); if not, write to the Free Software
19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #ifndef _NTFS_DEVICE_H
23 #define _NTFS_DEVICE_H
31 * Defined bits for the state field in the ntfs_device structure.
34 ND_Open, /* 1: Device is open. */
35 ND_ReadOnly, /* 1: Device is read-only. */
36 ND_Dirty, /* 1: Device is dirty, needs sync. */
37 } ntfs_device_state_bits;
39 #define test_ndev_flag(nd, flag) test_bit(ND_##flag, (nd)->d_state)
40 #define set_ndev_flag(nd, flag) set_bit(ND_##flag, (nd)->d_state)
41 #define clear_ndev_flag(nd, flag) clear_bit(ND_##flag, (nd)->d_state)
43 #define NDevOpen(nd) test_ndev_flag(nd, Open)
44 #define NDevSetOpen(nd) set_ndev_flag(nd, Open)
45 #define NDevClearOpen(nd) clear_ndev_flag(nd, Open)
47 #define NDevReadOnly(nd) test_ndev_flag(nd, ReadOnly)
48 #define NDevSetReadOnly(nd) set_ndev_flag(nd, ReadOnly)
49 #define NDevClearReadOnly(nd) clear_ndev_flag(nd, ReadOnly)
51 #define NDevDirty(nd) test_ndev_flag(nd, Dirty)
52 #define NDevSetDirty(nd) set_ndev_flag(nd, Dirty)
53 #define NDevClearDirty(nd) clear_ndev_flag(nd, Dirty)
55 /* Forward declaration. */
56 struct ntfs_device_operations;
59 * The ntfs device structure defining all operations needed to access the low
60 * level device underlying the ntfs volume.
63 struct ntfs_device_operations *d_ops; /* Device operations. */
64 unsigned long d_state; /* State of the device. */
65 char *d_name; /* Name of device. */
66 void *d_private; /* Private data used by the
71 * The ntfs device operations defining all operations that can be performed on
72 * the low level device described by a ntfs device structure.
74 struct ntfs_device_operations {
75 int (*open)(struct ntfs_device *dev, int flags);
76 int (*close)(struct ntfs_device *dev);
77 s64 (*seek)(struct ntfs_device *dev, s64 offset, int whence);
78 s64 (*read)(struct ntfs_device *dev, void *buf, s64 count);
79 s64 (*write)(struct ntfs_device *dev, const void *buf, s64 count);
80 s64 (*pread)(struct ntfs_device *dev, void *buf, s64 count, s64 offset);
81 s64 (*pwrite)(struct ntfs_device *dev, const void *buf, s64 count,
83 int (*sync)(struct ntfs_device *dev);
84 int (*stat)(struct ntfs_device *dev, struct stat *buf);
85 int (*ioctl)(struct ntfs_device *dev, int request, void *argp);
88 struct ntfs_device *ntfs_device_alloc(const char *name, const long state,
89 struct ntfs_device_operations *dops, void *private);
90 int ntfs_device_free(struct ntfs_device *dev);
92 #endif /* defined _NTFS_DEVICE_H */