Orangefs: kernel client part 1

[linux-block.git] / fs / orangefs / pvfs2-dev-proto.h

/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

#ifndef _PVFS2_DEV_PROTO_H
#define _PVFS2_DEV_PROTO_H

/*
 * types and constants shared between user space and kernel space for
 * device interaction using a common protocol
 */

/*
 * valid pvfs2 kernel operation types
 */
#define PVFS2_VFS_OP_INVALID           0xFF000000
#define PVFS2_VFS_OP_FILE_IO           0xFF000001
#define PVFS2_VFS_OP_LOOKUP            0xFF000002
#define PVFS2_VFS_OP_CREATE            0xFF000003
#define PVFS2_VFS_OP_GETATTR           0xFF000004
#define PVFS2_VFS_OP_REMOVE            0xFF000005
#define PVFS2_VFS_OP_MKDIR             0xFF000006
#define PVFS2_VFS_OP_READDIR           0xFF000007
#define PVFS2_VFS_OP_SETATTR           0xFF000008
#define PVFS2_VFS_OP_SYMLINK           0xFF000009
#define PVFS2_VFS_OP_RENAME            0xFF00000A
#define PVFS2_VFS_OP_STATFS            0xFF00000B
#define PVFS2_VFS_OP_TRUNCATE          0xFF00000C
#define PVFS2_VFS_OP_MMAP_RA_FLUSH     0xFF00000D
#define PVFS2_VFS_OP_FS_MOUNT          0xFF00000E
#define PVFS2_VFS_OP_FS_UMOUNT         0xFF00000F
#define PVFS2_VFS_OP_GETXATTR          0xFF000010
#define PVFS2_VFS_OP_SETXATTR          0xFF000011
#define PVFS2_VFS_OP_LISTXATTR         0xFF000012
#define PVFS2_VFS_OP_REMOVEXATTR       0xFF000013
#define PVFS2_VFS_OP_PARAM             0xFF000014
#define PVFS2_VFS_OP_PERF_COUNT        0xFF000015
#define PVFS2_VFS_OP_CANCEL            0xFF00EE00
#define PVFS2_VFS_OP_FSYNC             0xFF00EE01
#define PVFS2_VFS_OP_FSKEY             0xFF00EE02
#define PVFS2_VFS_OP_READDIRPLUS       0xFF00EE03
#define PVFS2_VFS_OP_FILE_IOX          0xFF00EE04

/*
 * Misc constants. Please retain them as multiples of 8!
 * Otherwise 32-64 bit interactions will be messed up :)
 */
#define PVFS2_NAME_LEN			0x00000100
#define PVFS2_MAX_DEBUG_STRING_LEN	0x00000400
#define PVFS2_MAX_DEBUG_ARRAY_LEN	0x00000800

/*
 * MAX_DIRENT_COUNT cannot be larger than PVFS_REQ_LIMIT_LISTATTR.
 * The value of PVFS_REQ_LIMIT_LISTATTR has been changed from 113 to 60
 * to accomodate an attribute object with mirrored handles.
 * MAX_DIRENT_COUNT is replaced by MAX_DIRENT_COUNT_READDIR and
 * MAX_DIRENT_COUNT_READDIRPLUS, since readdir doesn't trigger a listattr
 * but readdirplus might.
*/
#define MAX_DIRENT_COUNT_READDIR       0x00000060
#define MAX_DIRENT_COUNT_READDIRPLUS   0x0000003C

#include "upcall.h"
#include "downcall.h"

/*
 * These macros differ from proto macros in that they don't do any
 * byte-swappings and are used to ensure that kernel-clientcore interactions
 * don't cause any unaligned accesses etc on 64 bit machines
 */
#ifndef roundup4
#define roundup4(x) (((x)+3) & ~3)
#endif

#ifndef roundup8
#define roundup8(x) (((x)+7) & ~7)
#endif

/* strings; decoding just points into existing character data */
#define enc_string(pptr, pbuf) do { \
	__u32 len = strlen(*pbuf); \
	*(__u32 *) *(pptr) = (len); \
	memcpy(*(pptr)+4, *pbuf, len+1); \
	*(pptr) += roundup8(4 + len + 1); \
} while (0)

#define dec_string(pptr, pbuf, plen) do { \
	__u32 len = (*(__u32 *) *(pptr)); \
	*pbuf = *(pptr) + 4; \
	*(pptr) += roundup8(4 + len + 1); \
	if (plen) \
		*plen = len;\
} while (0)

struct read_write_x {
	__s64 off;
	__s64 len;
};

#endif