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109 lines
3.4 KiB
109 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2003 |
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*/ |
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#ifndef _H_JFS_SUPERBLOCK |
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#define _H_JFS_SUPERBLOCK |
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#include <linux/uuid.h> |
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/* |
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* make the magic number something a human could read |
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*/ |
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#define JFS_MAGIC "JFS1" /* Magic word */ |
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#define JFS_VERSION 2 /* Version number: Version 2 */ |
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#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */ |
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/* |
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* aggregate superblock |
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* |
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* The name superblock is too close to super_block, so the name has been |
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* changed to jfs_superblock. The utilities are still using the old name. |
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*/ |
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struct jfs_superblock { |
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char s_magic[4]; /* 4: magic number */ |
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__le32 s_version; /* 4: version number */ |
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__le64 s_size; /* 8: aggregate size in hardware/LVM blocks; |
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* VFS: number of blocks |
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*/ |
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__le32 s_bsize; /* 4: aggregate block size in bytes; |
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* VFS: fragment size |
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*/ |
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__le16 s_l2bsize; /* 2: log2 of s_bsize */ |
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__le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ |
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__le32 s_pbsize; /* 4: hardware/LVM block size in bytes */ |
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__le16 s_l2pbsize; /* 2: log2 of s_pbsize */ |
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__le16 pad; /* 2: padding necessary for alignment */ |
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__le32 s_agsize; /* 4: allocation group size in aggr. blocks */ |
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__le32 s_flag; /* 4: aggregate attributes: |
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* see jfs_filsys.h |
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*/ |
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__le32 s_state; /* 4: mount/unmount/recovery state: |
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* see jfs_filsys.h |
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*/ |
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__le32 s_compress; /* 4: > 0 if data compression */ |
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pxd_t s_ait2; /* 8: first extent of secondary |
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* aggregate inode table |
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*/ |
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pxd_t s_aim2; /* 8: first extent of secondary |
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* aggregate inode map |
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*/ |
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__le32 s_logdev; /* 4: device address of log */ |
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__le32 s_logserial; /* 4: log serial number at aggregate mount */ |
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pxd_t s_logpxd; /* 8: inline log extent */ |
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pxd_t s_fsckpxd; /* 8: inline fsck work space extent */ |
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struct timestruc_t s_time; /* 8: time last updated */ |
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__le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for |
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* the fsck service log. |
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* N.B. These blocks are divided among the |
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* versions kept. This is not a per |
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* version size. |
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* N.B. These blocks are included in the |
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* length field of s_fsckpxd. |
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*/ |
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s8 s_fscklog; /* 1: which fsck service log is most recent |
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* 0 => no service log data yet |
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* 1 => the first one |
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* 2 => the 2nd one |
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*/ |
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char s_fpack[11]; /* 11: file system volume name |
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* N.B. This must be 11 bytes to |
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* conform with the OS/2 BootSector |
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* requirements |
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* Only used when s_version is 1 |
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*/ |
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/* extendfs() parameter under s_state & FM_EXTENDFS */ |
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__le64 s_xsize; /* 8: extendfs s_size */ |
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pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */ |
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pxd_t s_xlogpxd; /* 8: extendfs logpxd */ |
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uuid_t s_uuid; /* 16: 128-bit uuid for volume */ |
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char s_label[16]; /* 16: volume label */ |
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uuid_t s_loguuid; /* 16: 128-bit uuid for log device */ |
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}; |
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extern int readSuper(struct super_block *, struct buffer_head **); |
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extern int updateSuper(struct super_block *, uint); |
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__printf(2, 3) |
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extern void jfs_error(struct super_block *, const char *, ...); |
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extern int jfs_mount(struct super_block *); |
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extern int jfs_mount_rw(struct super_block *, int); |
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extern int jfs_umount(struct super_block *); |
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extern int jfs_umount_rw(struct super_block *); |
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extern int jfs_extendfs(struct super_block *, s64, int); |
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extern struct task_struct *jfsIOthread; |
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extern struct task_struct *jfsSyncThread; |
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#endif /*_H_JFS_SUPERBLOCK */
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