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Diffstat (limited to 'fs/exofs/common.h')
| -rw-r--r-- | fs/exofs/common.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/fs/exofs/common.h b/fs/exofs/common.h new file mode 100644 index 000000000000..4f3a246b9d32 --- /dev/null +++ b/fs/exofs/common.h @@ -0,0 +1,157 @@ +/* + * 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 <linux/timex.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_OBJ_OFF 0x10000 /* offset for objects */ +#define EXOFS_SUPER_ID 0x10000 /* object ID for on-disk superblock */ +#define EXOFS_BM_ID 0x10001 /* object ID for ID bitmap */ +#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */ +#define EXOFS_TEST_ID 0x10003 /* object ID for test object */ + +/* exofs Application specific page/attribute */ +#ifndef OSD_PAGE_NUM_IBM_UOBJ_FS_DATA +# define OSD_PAGE_NUM_IBM_UOBJ_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3) +# define OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE 1 +#endif + +/* + * 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_UINT64_MAX = (~0LL), + EXOFS_MAX_INO_ID = (sizeof(ino_t) * 8 == 64) ? EXOFS_UINT64_MAX : + (1LL << (sizeof(ino_t) * 8 - 1)), + 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) + +/**************************************************************************** + * 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) + +#endif /*ifndef __EXOFS_COM_H__*/ |