1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2003 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 #ifndef _H_JFS_SUPERBLOCK 19 #define _H_JFS_SUPERBLOCK 20 21 /* 22 * make the magic number something a human could read 23 */ 24 #define JFS_MAGIC "JFS1" /* Magic word */ 25 26 #define JFS_VERSION 2 /* Version number: Version 2 */ 27 28 #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */ 29 30 /* 31 * aggregate superblock 32 * 33 * The name superblock is too close to super_block, so the name has been 34 * changed to jfs_superblock. The utilities are still using the old name. 35 */ 36 struct jfs_superblock { 37 char s_magic[4]; /* 4: magic number */ 38 __le32 s_version; /* 4: version number */ 39 40 __le64 s_size; /* 8: aggregate size in hardware/LVM blocks; 41 * VFS: number of blocks 42 */ 43 __le32 s_bsize; /* 4: aggregate block size in bytes; 44 * VFS: fragment size 45 */ 46 __le16 s_l2bsize; /* 2: log2 of s_bsize */ 47 __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ 48 __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */ 49 __le16 s_l2pbsize; /* 2: log2 of s_pbsize */ 50 __le16 pad; /* 2: padding necessary for alignment */ 51 52 __le32 s_agsize; /* 4: allocation group size in aggr. blocks */ 53 54 __le32 s_flag; /* 4: aggregate attributes: 55 * see jfs_filsys.h 56 */ 57 __le32 s_state; /* 4: mount/unmount/recovery state: 58 * see jfs_filsys.h 59 */ 60 __le32 s_compress; /* 4: > 0 if data compression */ 61 62 pxd_t s_ait2; /* 8: first extent of secondary 63 * aggregate inode table 64 */ 65 66 pxd_t s_aim2; /* 8: first extent of secondary 67 * aggregate inode map 68 */ 69 __le32 s_logdev; /* 4: device address of log */ 70 __le32 s_logserial; /* 4: log serial number at aggregate mount */ 71 pxd_t s_logpxd; /* 8: inline log extent */ 72 73 pxd_t s_fsckpxd; /* 8: inline fsck work space extent */ 74 75 struct timestruc_t s_time; /* 8: time last updated */ 76 77 __le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for 78 * the fsck service log. 79 * N.B. These blocks are divided among the 80 * versions kept. This is not a per 81 * version size. 82 * N.B. These blocks are included in the 83 * length field of s_fsckpxd. 84 */ 85 s8 s_fscklog; /* 1: which fsck service log is most recent 86 * 0 => no service log data yet 87 * 1 => the first one 88 * 2 => the 2nd one 89 */ 90 char s_fpack[11]; /* 11: file system volume name 91 * N.B. This must be 11 bytes to 92 * conform with the OS/2 BootSector 93 * requirements 94 * Only used when s_version is 1 95 */ 96 97 /* extendfs() parameter under s_state & FM_EXTENDFS */ 98 __le64 s_xsize; /* 8: extendfs s_size */ 99 pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ 100 pxd_t s_xlogpxd; /* 8: extendfs logpxd */ 101 /* - 128 byte boundary - */ 102 103 char s_uuid[16]; /* 16: 128-bit uuid for volume */ 104 char s_label[16]; /* 16: volume label */ 105 char s_loguuid[16]; /* 16: 128-bit uuid for log device */ 106 107 }; 108 109 extern int readSuper(struct super_block *, struct buffer_head **); 110 extern int updateSuper(struct super_block *, uint); 111 __printf(2, 3) 112 extern void jfs_error(struct super_block *, const char *, ...); 113 extern int jfs_mount(struct super_block *); 114 extern int jfs_mount_rw(struct super_block *, int); 115 extern int jfs_umount(struct super_block *); 116 extern int jfs_umount_rw(struct super_block *); 117 extern int jfs_extendfs(struct super_block *, s64, int); 118 119 extern struct task_struct *jfsIOthread; 120 extern struct task_struct *jfsSyncThread; 121 122 #endif /*_H_JFS_SUPERBLOCK */ 123