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-/*
- * common.h - Common definitions for both Kernel and user-mode utilities
- *
- * Copyright (C) 2005, 2006
- * Avishay Traeger (avishay@gmail.com)
- * Copyright (C) 2008, 2009
- * Boaz Harrosh <ooo@electrozaur.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_DEVTABLE_ID 0x10001 /* object ID for on-disk device table */
-#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */
-
-/* exofs Application specific page/attribute */
-/* Inode attrs */
-# define EXOFS_APAGE_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3)
-# define EXOFS_ATTR_INODE_DATA 1
-# define EXOFS_ATTR_INODE_FILE_LAYOUT 2
-# define EXOFS_ATTR_INODE_DIR_LAYOUT 3
-/* Partition attrs */
-# define EXOFS_APAGE_SB_DATA (0xF0000000U + 3)
-# define EXOFS_ATTR_SB_STATS 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 object EXOFS_SUPER_ID's data.
- * This is where the in-memory superblock is stored on disk.
- */
-enum {EXOFS_FSCB_VER = 1, EXOFS_DT_VER = 1};
-struct exofs_fscb {
- __le64 s_nextid; /* Only used after mkfs */
- __le64 s_numfiles; /* Only used after mkfs */
- __le32 s_version; /* == EXOFS_FSCB_VER */
- __le16 s_magic; /* Magic signature */
- __le16 s_newfs; /* Non-zero if this is a new fs */
-
- /* From here on it's a static part, only written by mkexofs */
- __le64 s_dev_table_oid; /* Resurved, not used */
- __le64 s_dev_table_count; /* == 0 means no dev_table */
-} __packed;
-
-/*
- * This struct is set on the FS partition's attributes.
- * [EXOFS_APAGE_SB_DATA, EXOFS_ATTR_SB_STATS] and is written together
- * with the create command, to atomically persist the sb writeable information.
- */
-struct exofs_sb_stats {
- __le64 s_nextid; /* Highest object ID used */
- __le64 s_numfiles; /* Number of files on fs */
-} __packed;
-
-/*
- * Describes the raid used in the FS. It is part of the device table.
- * This here is taken from the pNFS-objects definition. In exofs we
- * use one raid policy through-out the filesystem. (NOTE: the funny
- * alignment at beginning. We take care of it at exofs_device_table.
- */
-struct exofs_dt_data_map {
- __le32 cb_num_comps;
- __le64 cb_stripe_unit;
- __le32 cb_group_width;
- __le32 cb_group_depth;
- __le32 cb_mirror_cnt;
- __le32 cb_raid_algorithm;
-} __packed;
-
-/*
- * This is an osd device information descriptor. It is a single entry in
- * the exofs device table. It describes an osd target lun which
- * contains data belonging to this FS. (Same partition_id on all devices)
- */
-struct exofs_dt_device_info {
- __le32 systemid_len;
- u8 systemid[OSD_SYSTEMID_LEN];
- __le64 long_name_offset; /* If !0 then offset-in-file */
- __le32 osdname_len; /* */
- u8 osdname[44]; /* Embbeded, Usually an asci uuid */
-} __packed;
-
-/*
- * The EXOFS device table - stored in object EXOFS_DEVTABLE_ID's data.
- * It contains the raid used for this multy-device FS and an array of
- * participating devices.
- */
-struct exofs_device_table {
- __le32 dt_version; /* == EXOFS_DT_VER */
- struct exofs_dt_data_map dt_data_map; /* Raid policy to use */
-
- /* Resurved space For future use. Total includeing this:
- * (8 * sizeof(le64))
- */
- __le64 __Resurved[4];
-
- __le64 dt_num_devices; /* Array size */
- struct exofs_dt_device_info dt_dev_table[]; /* Array of devices */
-} __packed;
-
-/****************************************************************************
- * 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)
-
-/*
- * The on-disk (optional) layout structure.
- * sits in an EXOFS_ATTR_INODE_FILE_LAYOUT or EXOFS_ATTR_INODE_DIR_LAYOUT
- * attribute, attached to any inode, usually to a directory.
- */
-
-enum exofs_inode_layout_gen_functions {
- LAYOUT_MOVING_WINDOW = 0,
- LAYOUT_IMPLICT = 1,
-};
-
-struct exofs_on_disk_inode_layout {
- __le16 gen_func; /* One of enum exofs_inode_layout_gen_functions */
- __le16 pad;
- union {
- /* gen_func == LAYOUT_MOVING_WINDOW (default) */
- struct exofs_layout_sliding_window {
- __le32 num_devices; /* first n devices in global-table*/
- } sliding_window __packed;
-
- /* gen_func == LAYOUT_IMPLICT */
- struct exofs_layout_implict_list {
- struct exofs_dt_data_map data_map;
- /* Variable array of size data_map.cb_num_comps. These
- * are device indexes of the devices in the global table
- */
- __le32 dev_indexes[];
- } implict __packed;
- };
-} __packed;
-
-static inline size_t exofs_on_disk_inode_layout_size(unsigned max_devs)
-{
- return sizeof(struct exofs_on_disk_inode_layout) +
- max_devs * sizeof(__le32);
-}
-
-#endif /*ifndef __EXOFS_COM_H__*/