/* vi: set sw=4 ts=4: *//* * io.h --- the I/O manager abstraction * * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */#ifndef _EXT2FS_EXT2_IO_H#define _EXT2FS_EXT2_IO_H/* * ext2_loff_t is defined here since unix_io.c needs it. */#if defined(__GNUC__) || defined(HAS_LONG_LONG)typedef long long	ext2_loff_t;#elsetypedef long		ext2_loff_t;#endif/* llseek.c *//* ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int); */#ifdef CONFIG_LFS# define ext2fs_llseek lseek64#else# define ext2fs_llseek lseek#endiftypedef struct struct_io_manager *io_manager;typedef struct struct_io_channel *io_channel;#define CHANNEL_FLAGS_WRITETHROUGH	0x01struct struct_io_channel {	errcode_t	magic;	io_manager	manager;	char		*name;	int		block_size;	errcode_t	(*read_error)(io_channel channel,				      unsigned long block,				      int count,				      void *data,				      size_t size,				      int actual_bytes_read,				      errcode_t error);	errcode_t       (*write_error)(io_channel channel,				       unsigned long block,				       int count,				       const void *data,				       size_t size,				       int actual_bytes_written,				       errcode_t error);	int		refcount;	int		flags;	int		reserved[14];	void		*private_data;	void		*app_data;};struct struct_io_manager {	errcode_t magic;	const char *name;	errcode_t (*open)(const char *name, int flags, io_channel *channel);	errcode_t (*close)(io_channel channel);	errcode_t (*set_blksize)(io_channel channel, int blksize);	errcode_t (*read_blk)(io_channel channel, unsigned long block,			      int count, void *data);	errcode_t (*write_blk)(io_channel channel, unsigned long block,			       int count, const void *data);	errcode_t (*flush)(io_channel channel);	errcode_t (*write_byte)(io_channel channel, unsigned long offset,				int count, const void *data);	errcode_t (*set_option)(io_channel channel, const char *option,				const char *arg);	int             reserved[14];};#define IO_FLAG_RW	1/* * Convenience functions.... */#define io_channel_close(c)		((c)->manager->close((c)))#define io_channel_set_blksize(c,s)	((c)->manager->set_blksize((c),s))#define io_channel_read_blk(c,b,n,d)	((c)->manager->read_blk((c),b,n,d))#define io_channel_write_blk(c,b,n,d)	((c)->manager->write_blk((c),b,n,d))#define io_channel_flush(c)		((c)->manager->flush((c)))#define io_channel_bumpcount(c)		((c)->refcount++)/* io_manager.c */extern errcode_t io_channel_set_options(io_channel channel,					const char *options);extern errcode_t io_channel_write_byte(io_channel channel,				       unsigned long offset,				       int count, const void *data);/* unix_io.c */extern io_manager unix_io_manager;/* test_io.c */extern io_manager test_io_manager, test_io_backing_manager;extern void (*test_io_cb_read_blk)	(unsigned long block, int count, errcode_t err);extern void (*test_io_cb_write_blk)	(unsigned long block, int count, errcode_t err);extern void (*test_io_cb_set_blksize)	(int blksize, errcode_t err);#endif /* _EXT2FS_EXT2_IO_H */