include/linux/sysv_fs_sb.h

   1 #ifndef _SYSV_FS_SB
   2 #define _SYSV_FS_SB
   3
   4 /*
   5  * SystemV/V7/Coherent super-block data in memory
   6  * The SystemV/V7/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         char           s_bytesex;       /* bytesex (le/be/pdp) */
  16         char           s_truncate;      /* if 1: names > SYSV_NAMELEN chars are truncated */
  17                                         /* if 0: they are disallowed (ENAMETOOLONG) */
  18         nlink_t        s_link_max;      /* max number of hard links to a file */
  19         unsigned int   s_inodes_per_block;      /* number of inodes per block */
  20         unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
  21         unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
  22         unsigned int   s_ind_per_block;         /* number of indirections per block */
  23         unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
  24         unsigned int   s_ind_per_block_2;       /* ind_per_block ^ 2 */
  25         unsigned int   s_toobig_block;          /* 10 + ipb + ipb^2 + ipb^3 */
  26         unsigned int   s_block_base;    /* physical block number of block 0 */
  27         unsigned short s_fic_size;      /* free inode cache size, NICINOD */
  28         unsigned short s_flc_size;      /* free block list chunk size, NICFREE */
  29         /* The superblock is kept in one or two disk buffers: */
  30         struct buffer_head *s_bh1;
  31         struct buffer_head *s_bh2;
  32         /* These are pointers into the disk buffer, to compensate for
  33            different superblock layout. */
  34         char *         s_sbd1;          /* entire superblock data, for part 1 */
  35         char *         s_sbd2;          /* entire superblock data, for part 2 */
  36         u16            *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
  37         u16            *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
  38         u16            *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
  39         u16            *s_bcache_count; /* pointer to s_sbd->s_nfree */
  40         u32            *s_bcache;       /* pointer to s_sbd->s_free */
  41         u32            *s_free_blocks;  /* pointer to s_sbd->s_tfree */
  42         u32            *s_sb_time;      /* pointer to s_sbd->s_time */
  43         u32            *s_sb_state;     /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
  44         /* We keep those superblock entities that don't change here;
  45            this saves us an indirection and perhaps a conversion. */
  46         u32            s_firstinodezone; /* index of first inode zone */
  47         u32            s_firstdatazone; /* same as s_sbd->s_isize */
  48         u32            s_ninodes;       /* total number of inodes */
  49         u32            s_ndatazones;    /* total number of data zones */
  50         u32            s_nzones;        /* same as s_sbd->s_fsize */
  51         u16            s_namelen;       /* max length of dir entry */
  52 };
  53 /* The field s_toobig_block is currently unused. */
  54
  55 /* sv_ == u.sysv_sb.s_ */
  56 #define sv_type                                 u.sysv_sb.s_type
  57 #define sv_bytesex                              u.sysv_sb.s_bytesex
  58 #define sv_truncate                             u.sysv_sb.s_truncate
  59 #define sv_link_max                             u.sysv_sb.s_link_max
  60 #define sv_inodes_per_block                     u.sysv_sb.s_inodes_per_block
  61 #define sv_inodes_per_block_1                   u.sysv_sb.s_inodes_per_block_1
  62 #define sv_inodes_per_block_bits                u.sysv_sb.s_inodes_per_block_bits
  63 #define sv_ind_per_block                        u.sysv_sb.s_ind_per_block
  64 #define sv_ind_per_block_bits                   u.sysv_sb.s_ind_per_block_bits
  65 #define sv_ind_per_block_2                      u.sysv_sb.s_ind_per_block_2
  66 #define sv_toobig_block                         u.sysv_sb.s_toobig_block
  67 #define sv_block_base                           u.sysv_sb.s_block_base
  68 #define sv_fic_size                             u.sysv_sb.s_fic_size
  69 #define sv_flc_size                             u.sysv_sb.s_flc_size
  70 #define sv_bh1                                  u.sysv_sb.s_bh1
  71 #define sv_bh2                                  u.sysv_sb.s_bh2
  72 #define sv_sbd1                                 u.sysv_sb.s_sbd1
  73 #define sv_sbd2                                 u.sysv_sb.s_sbd2
  74 #define sv_sb_fic_count                         u.sysv_sb.s_sb_fic_count
  75 #define sv_sb_fic_inodes                        u.sysv_sb.s_sb_fic_inodes
  76 #define sv_sb_total_free_inodes                 u.sysv_sb.s_sb_total_free_inodes
  77 #define sv_bcache_count                         u.sysv_sb.s_bcache_count
  78 #define sv_bcache                               u.sysv_sb.s_bcache
  79 #define sv_free_blocks                          u.sysv_sb.s_free_blocks
  80 #define sv_sb_time                              u.sysv_sb.s_sb_time
  81 #define sv_sb_state                             u.sysv_sb.s_sb_state
  82 #define sv_firstinodezone                       u.sysv_sb.s_firstinodezone
  83 #define sv_firstdatazone                        u.sysv_sb.s_firstdatazone
  84 #define sv_ninodes                              u.sysv_sb.s_ninodes
  85 #define sv_ndatazones                           u.sysv_sb.s_ndatazones
  86 #define sv_nzones                               u.sysv_sb.s_nzones
  87 #define sv_namelen                              u.sysv_sb.s_namelen
  88
  89 #endif