1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) International Business Machines Corp., 2000-2003 4 */ 5 #ifndef _H_JFS_SUPERBLOCK 6 #define _H_JFS_SUPERBLOCK 7 8 #include <linux/uuid.h> 9 10 /* 11 * make the magic number something a human could read 12 */ 13 #define JFS_MAGIC "JFS1" /* Magic word */ 14 15 #define JFS_VERSION 2 /* Version number: Version 2 */ 16 17 #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */ 18 19 /* 20 * aggregate superblock 21 * 22 * The name superblock is too close to super_block, so the name has been 23 * changed to jfs_superblock. The utilities are still using the old name. 24 */ 25 struct jfs_superblock { 26 char s_magic[4]; /* 4: magic number */ 27 __le32 s_version; /* 4: version number */ 28 29 __le64 s_size; /* 8: aggregate size in hardware/LVM blocks; 30 * VFS: number of blocks 31 */ 32 __le32 s_bsize; /* 4: aggregate block size in bytes; 33 * VFS: fragment size 34 */ 35 __le16 s_l2bsize; /* 2: log2 of s_bsize */ 36 __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ 37 __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */ 38 __le16 s_l2pbsize; /* 2: log2 of s_pbsize */ 39 __le16 pad; /* 2: padding necessary for alignment */ 40 41 __le32 s_agsize; /* 4: allocation group size in aggr. blocks */ 42 43 __le32 s_flag; /* 4: aggregate attributes: 44 * see jfs_filsys.h 45 */ 46 __le32 s_state; /* 4: mount/unmount/recovery state: 47 * see jfs_filsys.h 48 */ 49 __le32 s_compress; /* 4: > 0 if data compression */ 50 51 pxd_t s_ait2; /* 8: first extent of secondary 52 * aggregate inode table 53 */ 54 55 pxd_t s_aim2; /* 8: first extent of secondary 56 * aggregate inode map 57 */ 58 __le32 s_logdev; /* 4: device address of log */ 59 __le32 s_logserial; /* 4: log serial number at aggregate mount */ 60 pxd_t s_logpxd; /* 8: inline log extent */ 61 62 pxd_t s_fsckpxd; /* 8: inline fsck work space extent */ 63 64 struct timestruc_t s_time; /* 8: time last updated */ 65 66 __le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for 67 * the fsck service log. 68 * N.B. These blocks are divided among the 69 * versions kept. This is not a per 70 * version size. 71 * N.B. These blocks are included in the 72 * length field of s_fsckpxd. 73 */ 74 s8 s_fscklog; /* 1: which fsck service log is most recent 75 * 0 => no service log data yet 76 * 1 => the first one 77 * 2 => the 2nd one 78 */ 79 char s_fpack[11]; /* 11: file system volume name 80 * N.B. This must be 11 bytes to 81 * conform with the OS/2 BootSector 82 * requirements 83 * Only used when s_version is 1 84 */ 85 86 /* extendfs() parameter under s_state & FM_EXTENDFS */ 87 __le64 s_xsize; /* 8: extendfs s_size */ 88 pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ 89 pxd_t s_xlogpxd; /* 8: extendfs logpxd */ 90 uuid_t s_uuid; /* 16: 128-bit uuid for volume */ 91 char s_label[16]; /* 16: volume label */ 92 uuid_t s_loguuid; /* 16: 128-bit uuid for log device */ 93 94 }; 95 96 extern int readSuper(struct super_block *, struct buffer_head **); 97 extern int updateSuper(struct super_block *, uint); 98 __printf(2, 3) 99 extern void jfs_error(struct super_block *, const char *, ...); 100 extern int jfs_mount(struct super_block *); 101 extern int jfs_mount_rw(struct super_block *, int); 102 extern int jfs_umount(struct super_block *); 103 extern int jfs_umount_rw(struct super_block *); 104 extern int jfs_extendfs(struct super_block *, s64, int); 105 106 extern struct task_struct *jfsIOthread; 107 extern struct task_struct *jfsSyncThread; 108 109 #endif /*_H_JFS_SUPERBLOCK */ 110