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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | /* * Copyright (C) International Business Machines Corp., 2000-2003 * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _H_JFS_SUPERBLOCK #define _H_JFS_SUPERBLOCK /* * make the magic number something a human could read */ #define JFS_MAGIC "JFS1" /* Magic word */ #define JFS_VERSION 2 /* Version number: Version 2 */ #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. */ struct jfs_superblock { char s_magic[4]; /* 4: magic number */ __le32 s_version; /* 4: version number */ __le64 s_size; /* 8: aggregate size in hardware/LVM blocks; * VFS: number of blocks */ __le32 s_bsize; /* 4: aggregate block size in bytes; * VFS: fragment size */ __le16 s_l2bsize; /* 2: log2 of s_bsize */ __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */ __le16 s_l2pbsize; /* 2: log2 of s_pbsize */ __le16 pad; /* 2: padding necessary for alignment */ __le32 s_agsize; /* 4: allocation group size in aggr. blocks */ __le32 s_flag; /* 4: aggregate attributes: * see jfs_filsys.h */ __le32 s_state; /* 4: mount/unmount/recovery state: * see jfs_filsys.h */ __le32 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 */ __le32 s_logdev; /* 4: device address of log */ __le32 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 */ __le32 s_fsckloglen; /* 4: Number of filesystem 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 * Only used when s_version is 1 */ /* extendfs() parameter under s_state & FM_EXTENDFS */ __le64 s_xsize; /* 8: extendfs s_size */ pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ pxd_t s_xlogpxd; /* 8: extendfs logpxd */ /* - 128 byte boundary - */ char s_uuid[16]; /* 16: 128-bit uuid for volume */ char s_label[16]; /* 16: volume label */ char s_loguuid[16]; /* 16: 128-bit uuid for log device */ }; extern int readSuper(struct super_block *, struct buffer_head **); extern int updateSuper(struct super_block *, uint); __printf(2, 3) extern void jfs_error(struct super_block *, const char *, ...); extern int jfs_mount(struct super_block *); extern int jfs_mount_rw(struct super_block *, int); extern int jfs_umount(struct super_block *); extern int jfs_umount_rw(struct super_block *); extern int jfs_extendfs(struct super_block *, s64, int); extern struct task_struct *jfsIOthread; extern struct task_struct *jfsSyncThread; #endif /*_H_JFS_SUPERBLOCK */ |