include/linux/sysv_fs_sb.h

   1 #ifndef _SYSV_FS_SB
   2 #define _SYSV_FS_SB
   3
   4 /*
   5  * SystemV/Coherent super-block data in memory
   6  * The SystemV/Coherent superblock contains dynamic data (it gets modified
   7  * while the system is running). This is in contrast to the Minix and Berkeley
   8  * filesystems (where the superblock is never modified). This affects the
   9  * sync() operation: we must keep the superblock in a disk buffer and use this
  10  * one as our "working copy".
  11  */
  12
  13 struct sysv_sb_info {
  14         int            s_type;          /* file system type: FSTYPE_{XENIX|SYSV|COH} */
  15         unsigned int   s_block_size;    /* zone size, = 512 or = 1024 */
  16         unsigned int   s_block_size_1;  /* block_size - 1 */
  17         unsigned int   s_block_size_bits;       /* log2(block_size) */
  18         unsigned int   s_block_size_inc_bits;   /* log2(block_size/BLOCK_SIZE) if >0 */
  19         unsigned int   s_block_size_dec_bits;   /* log2(BLOCK_SIZE/block_size) if >0 */
  20         char           s_convert;       /* flag whether byte ordering requires conversion */
  21         char           s_kludge_symlinks; /* flag whether symlinks have a kludgey mode */
  22         char           s_truncate;      /* if 1: names > SYSV_NAMELEN chars are truncated */
  23                                         /* if 0: they are disallowed (ENAMETOOLONG) */
  24         nlink_t        s_link_max;      /* max number of hard links to a file */
  25         unsigned int   s_inodes_per_block;      /* number of inodes per block */
  26         unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
  27         unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
  28         unsigned int   s_ind_per_block;         /* number of indirections per block */
  29         unsigned int   s_ind_per_block_1;       /* ind_per_block - 1 */
  30         unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
  31         unsigned int   s_ind_per_block_2;       /* ind_per_block ^ 2 */
  32         unsigned int   s_ind_per_block_2_1;     /* ind_per_block ^ 2 - 1 */
  33         unsigned int   s_ind_per_block_2_bits;  /* log2(ind_per_block^2) */
  34         unsigned int   s_ind_per_block_3;       /* ind_per_block ^ 3 */
  35         unsigned int   s_ind_per_block_block_size_1;    /* ind_per_block*block_size - 1 */
  36         unsigned int   s_ind_per_block_block_size_bits; /* log2(ind_per_block*block_size) */
  37         unsigned int   s_ind_per_block_2_block_size_1;  /* ind_per_block^2 * block_size - 1 */
  38         unsigned int   s_ind_per_block_2_block_size_bits; /* log2(ind_per_block^2 * block_size) */
  39         unsigned int   s_ind0_size;             /* 10 * block_size */
  40         unsigned int   s_ind1_size;             /* (10 + ipb) * block_size */
  41         unsigned int   s_ind2_size;             /* (10 + ipb + ipb^2) * block_size */
  42         unsigned int   s_toobig_block;          /* 10 + ipb + ipb^2 + ipb^3 */
  43         unsigned int   s_block_base;    /* physical block number of block 0 */
  44         unsigned short s_fic_size;      /* free inode cache size, NICINOD */
  45         unsigned short s_flc_size;      /* free block list chunk size, NICFREE */
  46         /* The superblock is kept in one or two disk buffers: */
  47         struct buffer_head *s_bh1;
  48         struct buffer_head *s_bh2;
  49         /* These are pointers into the disk buffer, to compensate for
  50            different superblock layout. */
  51         char *         s_sbd1;          /* entire superblock data, for part 1 */
  52         char *         s_sbd2;          /* entire superblock data, for part 2 */
  53         u16            *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
  54         u16            *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
  55         u16            *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
  56         u16            *s_sb_flc_count; /* pointer to s_sbd->s_nfree */
  57         u32            *s_sb_flc_blocks; /* pointer to s_sbd->s_free */
  58         u32            *s_sb_total_free_blocks;/* pointer to s_sbd->s_tfree */
  59         u32            *s_sb_time;      /* pointer to s_sbd->s_time */
  60         u32            *s_sb_state;     /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
  61         /* We keep those superblock entities that don't change here;
  62            this saves us an indirection and perhaps a conversion. */
  63         u32            s_firstinodezone; /* index of first inode zone */
  64         u32            s_firstdatazone; /* same as s_sbd->s_isize */
  65         u32            s_ninodes;       /* total number of inodes */
  66         u32            s_ndatazones;    /* total number of data zones */
  67         u32            s_nzones;        /* same as s_sbd->s_fsize */
  68 };
  69 /* The fields s_ind_per_block_2_1, s_toobig_block are currently unused. */
  70
  71 /* sv_ == u.sysv_sb.s_ */
  72 #define sv_type                                 u.sysv_sb.s_type
  73 #define sv_block_size                           u.sysv_sb.s_block_size
  74 #define sv_block_size_1                         u.sysv_sb.s_block_size_1
  75 #define sv_block_size_bits                      u.sysv_sb.s_block_size_bits
  76 #define sv_block_size_inc_bits                  u.sysv_sb.s_block_size_inc_bits
  77 #define sv_block_size_dec_bits                  u.sysv_sb.s_block_size_dec_bits
  78 #define sv_convert                              u.sysv_sb.s_convert
  79 #define sv_kludge_symlinks                      u.sysv_sb.s_kludge_symlinks
  80 #define sv_truncate                             u.sysv_sb.s_truncate
  81 #define sv_link_max                             u.sysv_sb.s_link_max
  82 #define sv_inodes_per_block                     u.sysv_sb.s_inodes_per_block
  83 #define sv_inodes_per_block_1                   u.sysv_sb.s_inodes_per_block_1
  84 #define sv_inodes_per_block_bits                u.sysv_sb.s_inodes_per_block_bits
  85 #define sv_ind_per_block                        u.sysv_sb.s_ind_per_block
  86 #define sv_ind_per_block_1                      u.sysv_sb.s_ind_per_block_1
  87 #define sv_ind_per_block_bits                   u.sysv_sb.s_ind_per_block_bits
  88 #define sv_ind_per_block_2                      u.sysv_sb.s_ind_per_block_2
  89 #define sv_ind_per_block_2_1                    u.sysv_sb.s_ind_per_block_2_1
  90 #define sv_ind_per_block_2_bits                 u.sysv_sb.s_ind_per_block_2_bits
  91 #define sv_ind_per_block_3                      u.sysv_sb.s_ind_per_block_3
  92 #define sv_ind_per_block_block_size_1           u.sysv_sb.s_ind_per_block_block_size_1
  93 #define sv_ind_per_block_block_size_bits        u.sysv_sb.s_ind_per_block_block_size_bits
  94 #define sv_ind_per_block_2_block_size_1         u.sysv_sb.s_ind_per_block_2_block_size_1
  95 #define sv_ind_per_block_2_block_size_bits      u.sysv_sb.s_ind_per_block_2_block_size_bits
  96 #define sv_ind0_size                            u.sysv_sb.s_ind0_size
  97 #define sv_ind1_size                            u.sysv_sb.s_ind1_size
  98 #define sv_ind2_size                            u.sysv_sb.s_ind2_size
  99 #define sv_toobig_block                         u.sysv_sb.s_toobig_block
 100 #define sv_block_base                           u.sysv_sb.s_block_base
 101 #define sv_fic_size                             u.sysv_sb.s_fic_size
 102 #define sv_flc_size                             u.sysv_sb.s_flc_size
 103 #define sv_bh1                                  u.sysv_sb.s_bh1
 104 #define sv_bh2                                  u.sysv_sb.s_bh2
 105 #define sv_sbd1                                 u.sysv_sb.s_sbd1
 106 #define sv_sbd2                                 u.sysv_sb.s_sbd2
 107 #define sv_sb_fic_count                         u.sysv_sb.s_sb_fic_count
 108 #define sv_sb_fic_inodes                        u.sysv_sb.s_sb_fic_inodes
 109 #define sv_sb_total_free_inodes                 u.sysv_sb.s_sb_total_free_inodes
 110 #define sv_sb_flc_count                         u.sysv_sb.s_sb_flc_count
 111 #define sv_sb_flc_blocks                        u.sysv_sb.s_sb_flc_blocks
 112 #define sv_sb_total_free_blocks                 u.sysv_sb.s_sb_total_free_blocks
 113 #define sv_sb_time                              u.sysv_sb.s_sb_time
 114 #define sv_sb_state                             u.sysv_sb.s_sb_state
 115 #define sv_firstinodezone                       u.sysv_sb.s_firstinodezone
 116 #define sv_firstdatazone                        u.sysv_sb.s_firstdatazone
 117 #define sv_ninodes                              u.sysv_sb.s_ninodes
 118 #define sv_ndatazones                           u.sysv_sb.s_ndatazones
 119 #define sv_nzones                               u.sysv_sb.s_nzones
 120
 121 #endif
 122