185 строки
6.4 KiB
C
185 строки
6.4 KiB
C
/*
|
|
* common.h - Common definitions for both Kernel and user-mode utilities
|
|
*
|
|
* Copyright (C) 2005, 2006
|
|
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
|
* Copyright (C) 2005, 2006
|
|
* International Business Machines
|
|
* Copyright (C) 2008, 2009
|
|
* Boaz Harrosh <bharrosh@panasas.com>
|
|
*
|
|
* Copyrights for code taken from ext2:
|
|
* Copyright (C) 1992, 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
* from
|
|
* linux/fs/minix/inode.c
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* This file is part of exofs.
|
|
*
|
|
* exofs is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation. Since it is based on ext2, and the only
|
|
* valid version of GPL for the Linux kernel is version 2, the only valid
|
|
* version of GPL for exofs is version 2.
|
|
*
|
|
* exofs is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with exofs; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef __EXOFS_COM_H__
|
|
#define __EXOFS_COM_H__
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <scsi/osd_attributes.h>
|
|
#include <scsi/osd_initiator.h>
|
|
#include <scsi/osd_sec.h>
|
|
|
|
/****************************************************************************
|
|
* Object ID related defines
|
|
* NOTE: inode# = object ID - EXOFS_OBJ_OFF
|
|
****************************************************************************/
|
|
#define EXOFS_MIN_PID 0x10000 /* Smallest partition ID */
|
|
#define EXOFS_OBJ_OFF 0x10000 /* offset for objects */
|
|
#define EXOFS_SUPER_ID 0x10000 /* object ID for on-disk superblock */
|
|
#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */
|
|
|
|
/* exofs Application specific page/attribute */
|
|
# define EXOFS_APAGE_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3)
|
|
# define EXOFS_ATTR_INODE_DATA 1
|
|
|
|
/*
|
|
* The maximum number of files we can have is limited by the size of the
|
|
* inode number. This is the largest object ID that the file system supports.
|
|
* Object IDs 0, 1, and 2 are always in use (see above defines).
|
|
*/
|
|
enum {
|
|
EXOFS_MAX_INO_ID = (sizeof(ino_t) * 8 == 64) ? ULLONG_MAX :
|
|
(1ULL << (sizeof(ino_t) * 8ULL - 1ULL)),
|
|
EXOFS_MAX_ID = (EXOFS_MAX_INO_ID - 1 - EXOFS_OBJ_OFF),
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Misc.
|
|
****************************************************************************/
|
|
#define EXOFS_BLKSHIFT 12
|
|
#define EXOFS_BLKSIZE (1UL << EXOFS_BLKSHIFT)
|
|
|
|
/****************************************************************************
|
|
* superblock-related things
|
|
****************************************************************************/
|
|
#define EXOFS_SUPER_MAGIC 0x5DF5
|
|
|
|
/*
|
|
* The file system control block - stored in an object's data (mainly, the one
|
|
* with ID EXOFS_SUPER_ID). This is where the in-memory superblock is stored
|
|
* on disk. Right now it just has a magic value, which is basically a sanity
|
|
* check on our ability to communicate with the object store.
|
|
*/
|
|
struct exofs_fscb {
|
|
__le64 s_nextid; /* Highest object ID used */
|
|
__le32 s_numfiles; /* Number of files on fs */
|
|
__le16 s_magic; /* Magic signature */
|
|
__le16 s_newfs; /* Non-zero if this is a new fs */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* inode-related things
|
|
****************************************************************************/
|
|
#define EXOFS_IDATA 5
|
|
|
|
/*
|
|
* The file control block - stored in an object's attributes. This is where
|
|
* the in-memory inode is stored on disk.
|
|
*/
|
|
struct exofs_fcb {
|
|
__le64 i_size; /* Size of the file */
|
|
__le16 i_mode; /* File mode */
|
|
__le16 i_links_count; /* Links count */
|
|
__le32 i_uid; /* Owner Uid */
|
|
__le32 i_gid; /* Group Id */
|
|
__le32 i_atime; /* Access time */
|
|
__le32 i_ctime; /* Creation time */
|
|
__le32 i_mtime; /* Modification time */
|
|
__le32 i_flags; /* File flags (unused for now)*/
|
|
__le32 i_generation; /* File version (for NFS) */
|
|
__le32 i_data[EXOFS_IDATA]; /* Short symlink names and device #s */
|
|
};
|
|
|
|
#define EXOFS_INO_ATTR_SIZE sizeof(struct exofs_fcb)
|
|
|
|
/* This is the Attribute the fcb is stored in */
|
|
static const struct __weak osd_attr g_attr_inode_data = ATTR_DEF(
|
|
EXOFS_APAGE_FS_DATA,
|
|
EXOFS_ATTR_INODE_DATA,
|
|
EXOFS_INO_ATTR_SIZE);
|
|
|
|
/****************************************************************************
|
|
* dentry-related things
|
|
****************************************************************************/
|
|
#define EXOFS_NAME_LEN 255
|
|
|
|
/*
|
|
* The on-disk directory entry
|
|
*/
|
|
struct exofs_dir_entry {
|
|
__le64 inode_no; /* inode number */
|
|
__le16 rec_len; /* directory entry length */
|
|
u8 name_len; /* name length */
|
|
u8 file_type; /* umm...file type */
|
|
char name[EXOFS_NAME_LEN]; /* file name */
|
|
};
|
|
|
|
enum {
|
|
EXOFS_FT_UNKNOWN,
|
|
EXOFS_FT_REG_FILE,
|
|
EXOFS_FT_DIR,
|
|
EXOFS_FT_CHRDEV,
|
|
EXOFS_FT_BLKDEV,
|
|
EXOFS_FT_FIFO,
|
|
EXOFS_FT_SOCK,
|
|
EXOFS_FT_SYMLINK,
|
|
EXOFS_FT_MAX
|
|
};
|
|
|
|
#define EXOFS_DIR_PAD 4
|
|
#define EXOFS_DIR_ROUND (EXOFS_DIR_PAD - 1)
|
|
#define EXOFS_DIR_REC_LEN(name_len) \
|
|
(((name_len) + offsetof(struct exofs_dir_entry, name) + \
|
|
EXOFS_DIR_ROUND) & ~EXOFS_DIR_ROUND)
|
|
|
|
/*************************
|
|
* function declarations *
|
|
*************************/
|
|
/* osd.c */
|
|
void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
|
|
const struct osd_obj_id *obj);
|
|
|
|
int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid);
|
|
static inline int exofs_check_ok(struct osd_request *or)
|
|
{
|
|
return exofs_check_ok_resid(or, NULL, NULL);
|
|
}
|
|
int exofs_sync_op(struct osd_request *or, int timeout, u8 *cred);
|
|
int exofs_async_op(struct osd_request *or,
|
|
osd_req_done_fn *async_done, void *caller_context, u8 *cred);
|
|
|
|
int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr);
|
|
|
|
int osd_req_read_kern(struct osd_request *or,
|
|
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
|
|
|
|
int osd_req_write_kern(struct osd_request *or,
|
|
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
|
|
|
|
#endif /*ifndef __EXOFS_COM_H__*/
|