Adding upstream version 1.47.0.upstream/1.47.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 179 insertions, 0 deletions

diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
new file mode 100644
index 0000000..679184e
--- /dev/null
+++ b/lib/ext2fs/ext2_io.h
@@ -0,0 +1,179 @@
+/*
+ * 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 Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#ifndef _EXT2FS_EXT2_IO_H
+#define _EXT2FS_EXT2_IO_H
+
+#include <ext2fs/ext2_types.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;
+#else
+typedef long		ext2_loff_t;
+#endif
+
+/* llseek.c */
+ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int);
+
+typedef struct struct_io_manager *io_manager;
+typedef struct struct_io_channel *io_channel;
+typedef struct struct_io_stats *io_stats;
+
+#define CHANNEL_FLAGS_WRITETHROUGH	0x01
+#define CHANNEL_FLAGS_DISCARD_ZEROES	0x02
+#define CHANNEL_FLAGS_BLOCK_DEVICE	0x04
+#define CHANNEL_FLAGS_THREADS		0x08
+
+#define io_channel_discard_zeroes_data(i) (i->flags & CHANNEL_FLAGS_DISCARD_ZEROES)
+
+struct 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;
+	long		reserved[14];
+	void		*private_data;
+	void		*app_data;
+	int		align;
+};
+
+struct struct_io_stats {
+	int			num_fields;
+	int			reserved;
+	unsigned long long	bytes_read;
+	unsigned long long	bytes_written;
+};
+
+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);
+	errcode_t (*get_stats)(io_channel channel, io_stats *io_stats);
+	errcode_t (*read_blk64)(io_channel channel, unsigned long long block,
+					int count, void *data);
+	errcode_t (*write_blk64)(io_channel channel, unsigned long long block,
+					int count, const void *data);
+	errcode_t (*discard)(io_channel channel, unsigned long long block,
+			     unsigned long long count);
+	errcode_t (*cache_readahead)(io_channel channel,
+				     unsigned long long block,
+				     unsigned long long count);
+	errcode_t (*zeroout)(io_channel channel, unsigned long long block,
+			     unsigned long long count);
+	long	reserved[14];
+};
+
+#define IO_FLAG_RW		0x0001
+#define IO_FLAG_EXCLUSIVE	0x0002
+#define IO_FLAG_DIRECT_IO	0x0004
+#define IO_FLAG_FORCE_BOUNCE	0x0008
+#define IO_FLAG_THREADS		0x0010
+#define IO_FLAG_NOCACHE		0x0020
+
+/*
+ * 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);
+extern errcode_t io_channel_read_blk64(io_channel channel,
+				       unsigned long long block,
+				       int count, void *data);
+extern errcode_t io_channel_write_blk64(io_channel channel,
+					unsigned long long block,
+					int count, const void *data);
+extern errcode_t io_channel_discard(io_channel channel,
+				    unsigned long long block,
+				    unsigned long long count);
+extern errcode_t io_channel_zeroout(io_channel channel,
+				    unsigned long long block,
+				    unsigned long long count);
+extern errcode_t io_channel_alloc_buf(io_channel channel,
+				      int count, void *ptr);
+extern errcode_t io_channel_cache_readahead(io_channel io,
+					    unsigned long long block,
+					    unsigned long long count);
+
+#ifdef _WIN32
+/* windows_io.c */
+extern io_manager windows_io_manager;
+#define default_io_manager windows_io_manager
+#else
+/* unix_io.c */
+extern io_manager unix_io_manager;
+extern io_manager unixfd_io_manager;
+#define default_io_manager unix_io_manager
+#endif
+
+/* sparse_io.c */
+extern io_manager sparse_io_manager;
+extern io_manager sparsefd_io_manager;
+
+/* undo_io.c */
+extern io_manager undo_io_manager;
+extern errcode_t set_undo_io_backing_manager(io_manager manager);
+extern errcode_t set_undo_io_backup_file(char *file_name);
+
+/* 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_read_blk64)
+	(unsigned long long block, int count, errcode_t err);
+extern void (*test_io_cb_write_blk64)
+	(unsigned long long block, int count, errcode_t err);
+extern void (*test_io_cb_set_blksize)
+	(int blksize, errcode_t err);
+
+#endif /* _EXT2FS_EXT2_IO_H */
+