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Diffstat (limited to 'fs/jfs/jfs_superblock.h')
| -rw-r--r-- | fs/jfs/jfs_superblock.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/fs/jfs/jfs_superblock.h b/fs/jfs/jfs_superblock.h new file mode 100644 index 000000000000..ab0566f70cfa --- /dev/null +++ b/fs/jfs/jfs_superblock.h @@ -0,0 +1,113 @@ +/* + * 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); +extern void jfs_error(struct super_block *, const char *, ...); + +#endif /*_H_JFS_SUPERBLOCK */ |