ref: 220dfb87f561f73ec1d154e08511332a660d1119
dir: /sys/src/9/xen/xen-public/io/fsif.h/
/******************************************************************************
* fsif.h
*
* Interface to FS level split device drivers.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (c) 2007, Grzegorz Milos, <gm281@cam.ac.uk>.
*/
#ifndef __XEN_PUBLIC_IO_FSIF_H__
#define __XEN_PUBLIC_IO_FSIF_H__
#include "ring.h"
#include "../grant_table.h"
#define REQ_FILE_OPEN 1
#define REQ_FILE_CLOSE 2
#define REQ_FILE_READ 3
#define REQ_FILE_WRITE 4
#define REQ_STAT 5
#define REQ_FILE_TRUNCATE 6
#define REQ_REMOVE 7
#define REQ_RENAME 8
#define REQ_CREATE 9
#define REQ_DIR_LIST 10
#define REQ_CHMOD 11
#define REQ_FS_SPACE 12
#define REQ_FILE_SYNC 13
struct fsif_open_request {
grant_ref_t gref;
};
struct fsif_close_request {
uint32_t fd;
};
struct fsif_read_request {
uint32_t fd;
int32_t pad;
uint64_t len;
uint64_t offset;
grant_ref_t grefs[1]; /* Variable length */
};
struct fsif_write_request {
uint32_t fd;
int32_t pad;
uint64_t len;
uint64_t offset;
grant_ref_t grefs[1]; /* Variable length */
};
struct fsif_stat_request {
uint32_t fd;
};
/* This structure is a copy of some fields from stat structure, returned
* via the ring. */
struct fsif_stat_response {
int32_t stat_mode;
uint32_t stat_uid;
uint32_t stat_gid;
int32_t stat_ret;
int64_t stat_size;
int64_t stat_atime;
int64_t stat_mtime;
int64_t stat_ctime;
};
struct fsif_truncate_request {
uint32_t fd;
int32_t pad;
int64_t length;
};
struct fsif_remove_request {
grant_ref_t gref;
};
struct fsif_rename_request {
uint16_t old_name_offset;
uint16_t new_name_offset;
grant_ref_t gref;
};
struct fsif_create_request {
int8_t directory;
int8_t pad;
int16_t pad2;
int32_t mode;
grant_ref_t gref;
};
struct fsif_list_request {
uint32_t offset;
grant_ref_t gref;
};
#define NR_FILES_SHIFT 0
#define NR_FILES_SIZE 16 /* 16 bits for the number of files mask */
#define NR_FILES_MASK (((1ULL << NR_FILES_SIZE) - 1) << NR_FILES_SHIFT)
#define ERROR_SIZE 32 /* 32 bits for the error mask */
#define ERROR_SHIFT (NR_FILES_SIZE + NR_FILES_SHIFT)
#define ERROR_MASK (((1ULL << ERROR_SIZE) - 1) << ERROR_SHIFT)
#define HAS_MORE_SHIFT (ERROR_SHIFT + ERROR_SIZE)
#define HAS_MORE_FLAG (1ULL << HAS_MORE_SHIFT)
struct fsif_chmod_request {
uint32_t fd;
int32_t mode;
};
struct fsif_space_request {
grant_ref_t gref;
};
struct fsif_sync_request {
uint32_t fd;
};
/* FS operation request */
struct fsif_request {
uint8_t type; /* Type of the request */
uint8_t pad;
uint16_t id; /* Request ID, copied to the response */
uint32_t pad2;
union {
struct fsif_open_request fopen;
struct fsif_close_request fclose;
struct fsif_read_request fread;
struct fsif_write_request fwrite;
struct fsif_stat_request fstat;
struct fsif_truncate_request ftruncate;
struct fsif_remove_request fremove;
struct fsif_rename_request frename;
struct fsif_create_request fcreate;
struct fsif_list_request flist;
struct fsif_chmod_request fchmod;
struct fsif_space_request fspace;
struct fsif_sync_request fsync;
} u;
};
typedef struct fsif_request fsif_request_t;
/* FS operation response */
struct fsif_response {
uint16_t id;
uint16_t pad1;
uint32_t pad2;
union {
uint64_t ret_val;
struct fsif_stat_response fstat;
} u;
};
typedef struct fsif_response fsif_response_t;
#define FSIF_RING_ENTRY_SIZE 64
#define FSIF_NR_READ_GNTS ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_read_request)) / \
sizeof(grant_ref_t) + 1)
#define FSIF_NR_WRITE_GNTS ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_write_request)) / \
sizeof(grant_ref_t) + 1)
DEFINE_RING_TYPES(fsif, struct fsif_request, struct fsif_response);
#define STATE_INITIALISED "init"
#define STATE_READY "ready"
#define STATE_CLOSING "closing"
#define STATE_CLOSED "closed"
#endif