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