sdcard: a program to create a "virtual" /sdcard pointed at a path

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= sdcard.c

LOCAL_MODULE:= sdcard

LOCAL_SHARED_LIBRARIES := libc

include $(BUILD_EXECUTABLE)

/*

    FUSE: Filesystem in Userspace

    Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>

    This program can be distributed under the terms of the GNU GPL.

    See the file COPYING.

*/

/*

 * from the libfuse FAQ (and consistent with the Linux Kernel license):

 *

 * Under what conditions may I distribute a filesystem that uses the

 * raw kernel interface of FUSE?

 *

 * There are no restrictions whatsoever for using the raw kernel interface. 

 *

 */

/*

 * This file defines the kernel interface of FUSE

 *

 * Protocol changelog:

 *

 * 7.9:

 *  - new fuse_getattr_in input argument of GETATTR

 *  - add lk_flags in fuse_lk_in

 *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in

 *  - add blksize field to fuse_attr

 *  - add file flags field to fuse_read_in and fuse_write_in

 *

 * 7.10

 *  - add nonseekable open flag

 *

 * 7.11

 *  - add IOCTL message

 *  - add unsolicited notification support

 *  - add POLL message and NOTIFY_POLL notification

 *

 * 7.12

 *  - add umask flag to input argument of open, mknod and mkdir

 *  - add notification messages for invalidation of inodes and

 *    directory entries

 *

 * 7.13

 *  - make max number of background requests and congestion threshold

 *    tunables

 */

#ifndef _LINUX_FUSE_H

#define _LINUX_FUSE_H

#include <linux/types.h>

/*

 * Version negotiation:

 *

 * Both the kernel and userspace send the version they support in the

 * INIT request and reply respectively.

 *

 * If the major versions match then both shall use the smallest

 * of the two minor versions for communication.

 *

 * If the kernel supports a larger major version, then userspace shall

 * reply with the major version it supports, ignore the rest of the

 * INIT message and expect a new INIT message from the kernel with a

 * matching major version.

 *

 * If the library supports a larger major version, then it shall fall

 * back to the major protocol version sent by the kernel for

 * communication and reply with that major version (and an arbitrary

 * supported minor version).

 */

/** Version number of this interface */

#define FUSE_KERNEL_VERSION 7

/** Minor version number of this interface */

#define FUSE_KERNEL_MINOR_VERSION 13

/** The node ID of the root inode */

#define FUSE_ROOT_ID 1

/* Make sure all structures are padded to 64bit boundary, so 32bit

   userspace works under 64bit kernels */

struct fuse_attr {

	__u64	ino;

	__u64	size;

	__u64	blocks;

	__u64	atime;

	__u64	mtime;

	__u64	ctime;

	__u32	atimensec;

	__u32	mtimensec;

	__u32	ctimensec;

	__u32	mode;

	__u32	nlink;

	__u32	uid;

	__u32	gid;

	__u32	rdev;

	__u32	blksize;

	__u32	padding;

};

struct fuse_kstatfs {

	__u64	blocks;

	__u64	bfree;

	__u64	bavail;

	__u64	files;

	__u64	ffree;

	__u32	bsize;

	__u32	namelen;

	__u32	frsize;

	__u32	padding;

	__u32	spare[6];

};

struct fuse_file_lock {

	__u64	start;

	__u64	end;

	__u32	type;

	__u32	pid; /* tgid */

};

/**

 * Bitmasks for fuse_setattr_in.valid

 */

#define FATTR_MODE	(1 << 0)

#define FATTR_UID	(1 << 1)

#define FATTR_GID	(1 << 2)

#define FATTR_SIZE	(1 << 3)

#define FATTR_ATIME	(1 << 4)

#define FATTR_MTIME	(1 << 5)

#define FATTR_FH	(1 << 6)

#define FATTR_ATIME_NOW	(1 << 7)

#define FATTR_MTIME_NOW	(1 << 8)

#define FATTR_LOCKOWNER	(1 << 9)

/**

 * Flags returned by the OPEN request

 *

 * FOPEN_DIRECT_IO: bypass page cache for this open file

 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open

 * FOPEN_NONSEEKABLE: the file is not seekable

 */

#define FOPEN_DIRECT_IO		(1 << 0)

#define FOPEN_KEEP_CACHE	(1 << 1)

#define FOPEN_NONSEEKABLE	(1 << 2)

/**

 * INIT request/reply flags

 *

 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."

 * FUSE_DONT_MASK: don't apply umask to file mode on create operations

 */

#define FUSE_ASYNC_READ		(1 << 0)

#define FUSE_POSIX_LOCKS	(1 << 1)

#define FUSE_FILE_OPS		(1 << 2)

#define FUSE_ATOMIC_O_TRUNC	(1 << 3)

#define FUSE_EXPORT_SUPPORT	(1 << 4)

#define FUSE_BIG_WRITES		(1 << 5)

#define FUSE_DONT_MASK		(1 << 6)

/**

 * CUSE INIT request/reply flags

 *

 * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl

 */

#define CUSE_UNRESTRICTED_IOCTL	(1 << 0)

/**

 * Release flags

 */

#define FUSE_RELEASE_FLUSH	(1 << 0)

/**

 * Getattr flags

 */

#define FUSE_GETATTR_FH		(1 << 0)

/**

 * Lock flags

 */

#define FUSE_LK_FLOCK		(1 << 0)

/**

 * WRITE flags

 *

 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed

 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid

 */

#define FUSE_WRITE_CACHE	(1 << 0)

#define FUSE_WRITE_LOCKOWNER	(1 << 1)

/**

 * Read flags

 */

#define FUSE_READ_LOCKOWNER	(1 << 1)

/**

 * Ioctl flags

 *

 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine

 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed

 * FUSE_IOCTL_RETRY: retry with new iovecs

 *

 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs

 */

#define FUSE_IOCTL_COMPAT	(1 << 0)

#define FUSE_IOCTL_UNRESTRICTED	(1 << 1)

#define FUSE_IOCTL_RETRY	(1 << 2)

#define FUSE_IOCTL_MAX_IOV	256

/**

 * Poll flags

 *

 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify

 */

#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)

enum fuse_opcode {

	FUSE_LOOKUP	   = 1,

	FUSE_FORGET	   = 2,  /* no reply */

	FUSE_GETATTR	   = 3,

	FUSE_SETATTR	   = 4,

	FUSE_READLINK	   = 5,

	FUSE_SYMLINK	   = 6,

	FUSE_MKNOD	   = 8,

	FUSE_MKDIR	   = 9,

	FUSE_UNLINK	   = 10,

	FUSE_RMDIR	   = 11,

	FUSE_RENAME	   = 12,

	FUSE_LINK	   = 13,

	FUSE_OPEN	   = 14,

	FUSE_READ	   = 15,

	FUSE_WRITE	   = 16,

	FUSE_STATFS	   = 17,

	FUSE_RELEASE       = 18,

	FUSE_FSYNC         = 20,

	FUSE_SETXATTR      = 21,

	FUSE_GETXATTR      = 22,

	FUSE_LISTXATTR     = 23,

	FUSE_REMOVEXATTR   = 24,

	FUSE_FLUSH         = 25,

	FUSE_INIT          = 26,

	FUSE_OPENDIR       = 27,

	FUSE_READDIR       = 28,

	FUSE_RELEASEDIR    = 29,

	FUSE_FSYNCDIR      = 30,

	FUSE_GETLK         = 31,

	FUSE_SETLK         = 32,

	FUSE_SETLKW        = 33,

	FUSE_ACCESS        = 34,

	FUSE_CREATE        = 35,

	FUSE_INTERRUPT     = 36,

	FUSE_BMAP          = 37,

	FUSE_DESTROY       = 38,

	FUSE_IOCTL         = 39,

	FUSE_POLL          = 40,

	/* CUSE specific operations */

	CUSE_INIT          = 4096,

};

enum fuse_notify_code {

	FUSE_NOTIFY_POLL   = 1,

	FUSE_NOTIFY_INVAL_INODE = 2,

	FUSE_NOTIFY_INVAL_ENTRY = 3,

	FUSE_NOTIFY_CODE_MAX,

};

/* The read buffer is required to be at least 8k, but may be much larger */

#define FUSE_MIN_READ_BUFFER 8192

#define FUSE_COMPAT_ENTRY_OUT_SIZE 120

struct fuse_entry_out {

	__u64	nodeid;		/* Inode ID */

	__u64	generation;	/* Inode generation: nodeid:gen must

				   be unique for the fs's lifetime */

	__u64	entry_valid;	/* Cache timeout for the name */

	__u64	attr_valid;	/* Cache timeout for the attributes */

	__u32	entry_valid_nsec;

	__u32	attr_valid_nsec;

	struct fuse_attr attr;

};

struct fuse_forget_in {

	__u64	nlookup;

};

struct fuse_getattr_in {

	__u32	getattr_flags;

	__u32	dummy;

	__u64	fh;

};

#define FUSE_COMPAT_ATTR_OUT_SIZE 96

struct fuse_attr_out {

	__u64	attr_valid;	/* Cache timeout for the attributes */

	__u32	attr_valid_nsec;

	__u32	dummy;

	struct fuse_attr attr;

};

#define FUSE_COMPAT_MKNOD_IN_SIZE 8

struct fuse_mknod_in {

	__u32	mode;

	__u32	rdev;

	__u32	umask;

	__u32	padding;

};

struct fuse_mkdir_in {

	__u32	mode;

	__u32	umask;

};

struct fuse_rename_in {

	__u64	newdir;

};

struct fuse_link_in {

	__u64	oldnodeid;

};

struct fuse_setattr_in {

	__u32	valid;

	__u32	padding;

	__u64	fh;

	__u64	size;

	__u64	lock_owner;

	__u64	atime;

	__u64	mtime;

	__u64	unused2;

	__u32	atimensec;

	__u32	mtimensec;

	__u32	unused3;

	__u32	mode;

	__u32	unused4;

	__u32	uid;

	__u32	gid;

	__u32	unused5;

};

struct fuse_open_in {

	__u32	flags;

	__u32	unused;

};

struct fuse_create_in {

	__u32	flags;

	__u32	mode;

	__u32	umask;

	__u32	padding;

};

struct fuse_open_out {

	__u64	fh;

	__u32	open_flags;

	__u32	padding;

};

struct fuse_release_in {

	__u64	fh;

	__u32	flags;

	__u32	release_flags;

	__u64	lock_owner;

};

struct fuse_flush_in {

	__u64	fh;

	__u32	unused;

	__u32	padding;

	__u64	lock_owner;

};

struct fuse_read_in {

	__u64	fh;

	__u64	offset;

	__u32	size;

	__u32	read_flags;

	__u64	lock_owner;

	__u32	flags;

	__u32	padding;

};

#define FUSE_COMPAT_WRITE_IN_SIZE 24

struct fuse_write_in {

	__u64	fh;

	__u64	offset;

	__u32	size;

	__u32	write_flags;

	__u64	lock_owner;

	__u32	flags;

	__u32	padding;

};

struct fuse_write_out {

	__u32	size;

	__u32	padding;

};

#define FUSE_COMPAT_STATFS_SIZE 48

struct fuse_statfs_out {

	struct fuse_kstatfs st;

};

struct fuse_fsync_in {

	__u64	fh;

	__u32	fsync_flags;

	__u32	padding;

};

struct fuse_setxattr_in {

	__u32	size;

	__u32	flags;

};

struct fuse_getxattr_in {

	__u32	size;

	__u32	padding;

};

struct fuse_getxattr_out {

	__u32	size;

	__u32	padding;

};

struct fuse_lk_in {

	__u64	fh;

	__u64	owner;

	struct fuse_file_lock lk;

	__u32	lk_flags;

	__u32	padding;

};

struct fuse_lk_out {

	struct fuse_file_lock lk;

};

struct fuse_access_in {

	__u32	mask;

	__u32	padding;

};

struct fuse_init_in {

	__u32	major;

	__u32	minor;

	__u32	max_readahead;

	__u32	flags;

};

struct fuse_init_out {

	__u32	major;

	__u32	minor;

	__u32	max_readahead;

	__u32	flags;

	__u16   max_background;

	__u16   congestion_threshold;

	__u32	max_write;

};

#define CUSE_INIT_INFO_MAX 4096

struct cuse_init_in {

	__u32	major;

	__u32	minor;

	__u32	unused;

	__u32	flags;

};

struct cuse_init_out {

	__u32	major;

	__u32	minor;

	__u32	unused;

	__u32	flags;

	__u32	max_read;

	__u32	max_write;

	__u32	dev_major;		/* chardev major */

	__u32	dev_minor;		/* chardev minor */

	__u32	spare[10];

};

struct fuse_interrupt_in {

	__u64	unique;

};

struct fuse_bmap_in {

	__u64	block;

	__u32	blocksize;

	__u32	padding;

};

struct fuse_bmap_out {

	__u64	block;

};

struct fuse_ioctl_in {

	__u64	fh;

	__u32	flags;

	__u32	cmd;

	__u64	arg;

	__u32	in_size;

	__u32	out_size;

};

struct fuse_ioctl_out {

	__s32	result;

	__u32	flags;

	__u32	in_iovs;

	__u32	out_iovs;

};

struct fuse_poll_in {

	__u64	fh;

	__u64	kh;

	__u32	flags;

	__u32   padding;

};

struct fuse_poll_out {

	__u32	revents;

	__u32	padding;

};

struct fuse_notify_poll_wakeup_out {

	__u64	kh;

};

struct fuse_in_header {

	__u32	len;

	__u32	opcode;

	__u64	unique;

	__u64	nodeid;

	__u32	uid;

	__u32	gid;

	__u32	pid;

	__u32	padding;

};

struct fuse_out_header {

	__u32	len;

	__s32	error;

	__u64	unique;

};

struct fuse_dirent {

	__u64	ino;

	__u64	off;

	__u32	namelen;

	__u32	type;

	char name[0];

};

#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)

#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))

#define FUSE_DIRENT_SIZE(d) \

	FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)

struct fuse_notify_inval_inode_out {

	__u64	ino;

	__s64	off;

	__s64	len;

};

struct fuse_notify_inval_entry_out {

	__u64	parent;

	__u32	namelen;

	__u32	padding;

};

#endif /* _LINUX_FUSE_H */