cow_user.c File Reference

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <endian.h>
#include "cow.h"
#include "cow_sys.h"

Go to the source code of this file.

Data Structures
struct	cow_header_v1
struct	cow_header_v2
struct	cow_header_v3
struct	cow_header_v3_broken
union	cow_header

Macros
#define	PATH_LEN_V1   256
#define	PATH_LEN_V3   4096
#define	PATH_LEN_V2   PATH_LEN_V3
#define	COW_BITMAP   0
#define	COW_MAGIC   0x4f4f4f4d /* MOOO */
#define	COW_VERSION   3
#define	DIV_ROUND(x, len)   (((x) + (len) - 1) / (len))
#define	ROUND_UP(x, align)   DIV_ROUND(x, align) * (align)

Typedefs
typedef __u32	time32_t

Functions
struct cow_header_v1	__attribute__ ((packed))
void	cow_sizes (int version, __u64 size, int sectorsize, int align, int bitmap_offset, unsigned long *bitmap_len_out, int *data_offset_out)
int	write_cow_header (char *cow_file, int fd, char *backing_file, int sectorsize, int alignment, unsigned long long *size)
int	file_reader (__u64 offset, char *buf, int len, void *arg)
int	read_cow_header (int(*reader)(__u64, char *, int, void *), void *arg, __u32 *version_out, char **backing_file_out, time_t *mtime_out, unsigned long long *size_out, int *sectorsize_out, __u32 *align_out, int *bitmap_offset_out)
int	init_cow_file (int fd, char *cow_file, char *backing_file, int sectorsize, int alignment, int *bitmap_offset_out, unsigned long *bitmap_len_out, int *data_offset_out)

Variables
__s32	magic
__s32	version
char	backing_file [PATH_LEN_V1]
time32_t	mtime
__u64	size
__s32	sectorsize
__u32	alignment
__u32	cow_format
struct cow_header_v3_broken	__attribute__

Macro Definition Documentation

#define COW_BITMAP   0

Definition at line 109 of file cow_user.c.

#define COW_MAGIC   0x4f4f4f4d /* MOOO */

Definition at line 118 of file cow_user.c.

#define COW_VERSION   3

Definition at line 119 of file cow_user.c.

#define DIV_ROUND	(		x,
			len
	)		(((x) + (len) - 1) / (len))

Definition at line 121 of file cow_user.c.

#define PATH_LEN_V1   256

Definition at line 18 of file cow_user.c.

#define PATH_LEN_V2   PATH_LEN_V3

Definition at line 39 of file cow_user.c.

#define PATH_LEN_V3   4096

Definition at line 38 of file cow_user.c.

#define ROUND_UP	(		x,
			align
	)		DIV_ROUND(x, align) * (align)

Definition at line 122 of file cow_user.c.

Typedef Documentation

typedef __u32 time32_t

Definition at line 20 of file cow_user.c.

Function Documentation

struct cow_header_v1 __attribute__ ( (packed)  )

read

Definition at line 171 of file esd_usb2.c.

void cow_sizes	(	int	version,
		__u64	size,
		int	sectorsize,
		int	align,
		int	bitmap_offset,
		unsigned long *	bitmap_len_out,
		int *	data_offset_out
	)

Definition at line 124 of file cow_user.c.

int file_reader	(	__u64	offset,
		char *	buf,
		int	len,
		void *	arg
	)

Definition at line 268 of file cow_user.c.

int init_cow_file	(	int	fd,
		char *	cow_file,
		char *	backing_file,
		int	sectorsize,
		int	alignment,
		int *	bitmap_offset_out,
		unsigned long *	bitmap_len_out,
		int *	data_offset_out
	)

Definition at line 402 of file cow_user.c.

int read_cow_header	(	int(*)(__u64, char *, int, void *)	reader,
		void *	arg,
		__u32 *	version_out,
		char **	backing_file_out,
		time_t *	mtime_out,
		unsigned long long *	size_out,
		int *	sectorsize_out,
		__u32 *	align_out,
		int *	bitmap_offset_out
	)

Definition at line 277 of file cow_user.c.

int write_cow_header	(	char *	cow_file,
		int	fd,
		char *	backing_file,
		int	sectorsize,
		int	alignment,
		unsigned long long *	size
	)

Definition at line 196 of file cow_user.c.

Variable Documentation

struct cow_header_v3_broken __attribute__

__u32 alignment

Definition at line 100 of file cow_user.c.

char backing_file

Definition at line 32 of file cow_user.c.

__u32 cow_format

Definition at line 101 of file cow_user.c.

__u32 magic

Definition at line 30 of file cow_user.c.

struct ceph_timespec mtime

Definition at line 33 of file cow_user.c.

__u32 sectorsize

Definition at line 35 of file cow_user.c.

__u64 size

Definition at line 34 of file cow_user.c.

__u32 version

Definition at line 31 of file cow_user.c.