fs/jfs/jfs_superblock.h

   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 */