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 #include <linux/uuid.h> 22 23 /* 24 * make the magic number something a human could read 25 */ 26 #define JFS_MAGIC "JFS1" /* Magic word */ 27 28 #define JFS_VERSION 2 /* Version number: Version 2 */ 29 30 #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */ 31 32 /* 33 * aggregate superblock 34 * 35 * The name superblock is too close to super_block, so the name has been 36 * changed to jfs_superblock. The utilities are still using the old name. 37 */ 38 struct jfs_superblock { 39 char s_magic[4]; /* 4: magic number */ 40 __le32 s_version; /* 4: version number */ 41 42 __le64 s_size; /* 8: aggregate size in hardware/LVM blocks; 43 * VFS: number of blocks 44 */ 45 __le32 s_bsize; /* 4: aggregate block size in bytes; 46 * VFS: fragment size 47 */ 48 __le16 s_l2bsize; /* 2: log2 of s_bsize */ 49 __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ 50 __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */ 51 __le16 s_l2pbsize; /* 2: log2 of s_pbsize */ 52 __le16 pad; /* 2: padding necessary for alignment */ 53 54 __le32 s_agsize; /* 4: allocation group size in aggr. blocks */ 55 56 __le32 s_flag; /* 4: aggregate attributes: 57 * see jfs_filsys.h 58 */ 59 __le32 s_state; /* 4: mount/unmount/recovery state: 60 * see jfs_filsys.h 61 */ 62 __le32 s_compress; /* 4: > 0 if data compression */ 63 64 pxd_t s_ait2; /* 8: first extent of secondary 65 * aggregate inode table 66 */ 67 68 pxd_t s_aim2; /* 8: first extent of secondary 69 * aggregate inode map 70 */ 71 __le32 s_logdev; /* 4: device address of log */ 72 __le32 s_logserial; /* 4: log serial number at aggregate mount */ 73 pxd_t s_logpxd; /* 8: inline log extent */ 74 75 pxd_t s_fsckpxd; /* 8: inline fsck work space extent */ 76 77 struct timestruc_t s_time; /* 8: time last updated */ 78 79 __le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for 80 * the fsck service log. 81 * N.B. These blocks are divided among the 82 * versions kept. This is not a per 83 * version size. 84 * N.B. These blocks are included in the 85 * length field of s_fsckpxd. 86 */ 87 s8 s_fscklog; /* 1: which fsck service log is most recent 88 * 0 => no service log data yet 89 * 1 => the first one 90 * 2 => the 2nd one 91 */ 92 char s_fpack[11]; /* 11: file system volume name 93 * N.B. This must be 11 bytes to 94 * conform with the OS/2 BootSector 95 * requirements 96 * Only used when s_version is 1 97 */ 98 99 /* extendfs() parameter under s_state & FM_EXTENDFS */ 100 __le64 s_xsize; /* 8: extendfs s_size */ 101 pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ 102 pxd_t s_xlogpxd; /* 8: extendfs logpxd */ 103 uuid_t s_uuid; /* 16: 128-bit uuid for volume */ 104 char s_label[16]; /* 16: volume label */ 105 uuid_t s_loguuid; /* 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