| /* |
| * Copyright (c) International Business Machines Corp., 2000 |
| * |
| * This program 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| * |
| */ |
| #ifndef _H_JFS_SUPERBLOCK |
| #define _H_JFS_SUPERBLOCK |
| /* |
| * jfs_superblock.h |
| */ |
| |
| /* |
| * make the magic number something a human could read |
| */ |
| #define JFS_MAGIC "JFS1" /* Magic word: Version 1 */ |
| |
| #define JFS_VERSION 1 /* Version number: Version 1 */ |
| |
| #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */ |
| |
| /* |
| * aggregate superblock |
| * |
| * The name superblock is too close to super_block, so the name has been |
| * changed to jfs_superblock. The utilities are still using the old name. |
| */ |
| #ifdef _JFS_UTILITY |
| struct superblock |
| #else |
| struct jfs_superblock |
| #endif |
| { |
| char s_magic[4]; /* 4: magic number */ |
| u32 s_version; /* 4: version number */ |
| |
| s64 s_size; /* 8: aggregate size in hardware/LVM blocks; |
| * VFS: number of blocks |
| */ |
| s32 s_bsize; /* 4: aggregate block size in bytes; |
| * VFS: fragment size |
| */ |
| s16 s_l2bsize; /* 2: log2 of s_bsize */ |
| s16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ |
| s32 s_pbsize; /* 4: hardware/LVM block size in bytes */ |
| s16 s_l2pbsize; /* 2: log2 of s_pbsize */ |
| s16 pad; /* 2: padding necessary for alignment */ |
| |
| u32 s_agsize; /* 4: allocation group size in aggr. blocks */ |
| |
| u32 s_flag; /* 4: aggregate attributes: |
| * see jfs_filsys.h |
| */ |
| u32 s_state; /* 4: mount/unmount/recovery state: |
| * see jfs_filsys.h |
| */ |
| s32 s_compress; /* 4: > 0 if data compression */ |
| |
| pxd_t s_ait2; /* 8: first extent of secondary |
| * aggregate inode table |
| */ |
| |
| pxd_t s_aim2; /* 8: first extent of secondary |
| * aggregate inode map |
| */ |
| u32 s_logdev; /* 4: device address of log */ |
| s32 s_logserial; /* 4: log serial number at aggregate mount */ |
| pxd_t s_logpxd; /* 8: inline log extent */ |
| |
| pxd_t s_fsckpxd; /* 8: inline fsck work space extent */ |
| |
| struct timestruc_t s_time; /* 8: time last updated */ |
| |
| s32 s_fsckloglen; /* 4: Number of file system blocks reserved for |
| * the fsck service log. |
| * N.B. These blocks are divided among the |
| * versions kept. This is not a per |
| * version size. |
| * N.B. These blocks are included in the |
| * length field of s_fsckpxd. |
| */ |
| s8 s_fscklog; /* 1: which fsck service log is most recent |
| * 0 => no service log data yet |
| * 1 => the first one |
| * 2 => the 2nd one |
| */ |
| char s_fpack[11]; /* 11: file system volume name |
| * N.B. This must be 11 bytes to |
| * conform with the OS/2 BootSector |
| * requirements |
| */ |
| |
| /* extendfs() parameter under s_state & FM_EXTENDFS */ |
| s64 s_xsize; /* 8: extendfs s_size */ |
| pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ |
| pxd_t s_xlogpxd; /* 8: extendfs logpxd */ |
| /* - 128 byte boundary - */ |
| |
| /* |
| * DFS VFS support (preliminary) |
| */ |
| char s_attach; /* 1: VFS: flag: set when aggregate is attached |
| */ |
| u8 rsrvd4[7]; /* 7: reserved - set to 0 */ |
| |
| u64 totalUsable; /* 8: VFS: total of 1K blocks which are |
| * available to "normal" (non-root) users. |
| */ |
| u64 minFree; /* 8: VFS: # of 1K blocks held in reserve for |
| * exclusive use of root. This value can be 0, |
| * and if it is then totalUsable will be equal |
| * to # of blocks in aggregate. I believe this |
| * means that minFree + totalUsable = # blocks. |
| * In that case, we don't need to store both |
| * totalUsable and minFree since we can compute |
| * one from the other. I would guess minFree |
| * would be the one we should store, and |
| * totalUsable would be the one we should |
| * compute. (Just a guess...) |
| */ |
| |
| u64 realFree; /* 8: VFS: # of free 1K blocks can be used by |
| * "normal" users. It may be this is something |
| * we should compute when asked for instead of |
| * storing in the superblock. I don't know how |
| * often this information is needed. |
| */ |
| /* |
| * graffiti area |
| */ |
| }; |
| |
| #endif /*_H_JFS_SUPERBLOCK */ |
