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- /*
- * device.h - Exports for low level device io. Part of the Linux-NTFS project.
- *
- * Copyright (c) 2000-2004 Anton Altaparmakov
- *
- * This program/include file is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program/include file is distributed in the hope that it will be
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (in the main directory of the Linux-NTFS
- * distribution in the file COPYING); if not, write to the Free Software
- * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
- #ifndef _NTFS_DEVICE_H
- #define _NTFS_DEVICE_H
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "device_io.h"
- #include "types.h"
- #include "support.h"
- #include "volume.h"
-
- /*
- * Defined bits for the state field in the ntfs_device structure.
- */
- typedef enum {
- ND_Open, /* 1: Device is open. */
- ND_ReadOnly, /* 1: Device is read-only. */
- ND_Dirty, /* 1: Device is dirty, needs sync. */
- } ntfs_device_state_bits;
-
- #define test_ndev_flag(nd, flag) test_bit(ND_##flag, (nd)->d_state)
- #define set_ndev_flag(nd, flag) set_bit(ND_##flag, (nd)->d_state)
- #define clear_ndev_flag(nd, flag) clear_bit(ND_##flag, (nd)->d_state)
-
- #define NDevOpen(nd) test_ndev_flag(nd, Open)
- #define NDevSetOpen(nd) set_ndev_flag(nd, Open)
- #define NDevClearOpen(nd) clear_ndev_flag(nd, Open)
-
- #define NDevReadOnly(nd) test_ndev_flag(nd, ReadOnly)
- #define NDevSetReadOnly(nd) set_ndev_flag(nd, ReadOnly)
- #define NDevClearReadOnly(nd) clear_ndev_flag(nd, ReadOnly)
-
- #define NDevDirty(nd) test_ndev_flag(nd, Dirty)
- #define NDevSetDirty(nd) set_ndev_flag(nd, Dirty)
- #define NDevClearDirty(nd) clear_ndev_flag(nd, Dirty)
-
- /*
- * The ntfs device structure defining all operations needed to access the low
- * level device underlying the ntfs volume.
- */
- struct ntfs_device {
- struct ntfs_device_operations *d_ops; /* Device operations. */
- unsigned long d_state; /* State of the device. */
- char *d_name; /* Name of device. */
- void *d_private; /* Private data used by the
- device operations. */
- };
-
- struct stat;
-
- /*
- * The ntfs device operations defining all operations that can be performed on
- * the low level device described by an ntfs device structure.
- */
- struct ntfs_device_operations {
- int (*open)(struct ntfs_device *dev, int flags);
- int (*close)(struct ntfs_device *dev);
- s64 (*seek)(struct ntfs_device *dev, s64 offset, int whence);
- s64 (*read)(struct ntfs_device *dev, void *buf, s64 count);
- s64 (*write)(struct ntfs_device *dev, const void *buf, s64 count);
- s64 (*pread)(struct ntfs_device *dev, void *buf, s64 count, s64 offset);
- s64 (*pwrite)(struct ntfs_device *dev, const void *buf, s64 count,
- s64 offset);
- int (*sync)(struct ntfs_device *dev);
- int (*stat)(struct ntfs_device *dev, struct stat *buf);
- int (*ioctl)(struct ntfs_device *dev, int request, void *argp);
- };
-
- extern struct ntfs_device *ntfs_device_alloc(const char *name, const long state,
- struct ntfs_device_operations *dops, void *priv_data);
- extern int ntfs_device_free(struct ntfs_device *dev);
-
- extern s64 ntfs_pread(struct ntfs_device *dev, const s64 pos, s64 count,
- void *b);
- extern s64 ntfs_pwrite(struct ntfs_device *dev, const s64 pos, s64 count,
- const void *b);
-
- extern s64 ntfs_mst_pread(struct ntfs_device *dev, const s64 pos, s64 count,
- const u32 bksize, void *b);
- extern s64 ntfs_mst_pwrite(struct ntfs_device *dev, const s64 pos, s64 count,
- const u32 bksize, void *b);
-
- extern s64 ntfs_cluster_read(const ntfs_volume *vol, const s64 lcn,
- const s64 count, void *b);
- extern s64 ntfs_cluster_write(const ntfs_volume *vol, const s64 lcn,
- const s64 count, const void *b);
-
- extern s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size);
- extern s64 ntfs_device_partition_start_sector_get(struct ntfs_device *dev);
- extern int ntfs_device_heads_get(struct ntfs_device *dev);
- extern int ntfs_device_sectors_per_track_get(struct ntfs_device *dev);
-
- #endif /* defined _NTFS_DEVICE_H */
-