104 lines
5.3 KiB
C
104 lines
5.3 KiB
C
#ifndef _SYSV_FS_SB
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#define _SYSV_FS_SB
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/*
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* SystemV/Coherent super-block data in memory
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* The SystemV/Coherent superblock contains dynamic data (it gets modified
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* while the system is running). This is in contrast to the Minix and Berkeley
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* filesystems (where the superblock is never modified). This affects the
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* sync() operation: we must keep the superblock in a disk buffer and use this
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* one as our "working copy".
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*/
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struct sysv_sb_info {
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int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
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unsigned int s_block_size; /* zone size, = 512 or = 1024 */
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unsigned int s_block_size_1; /* block_size - 1 */
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unsigned int s_block_size_bits; /* log2(block_size) */
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unsigned int s_block_size_ratio; /* BLOCK_SIZE / block_size */
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unsigned int s_block_size_ratio_1; /* block_size_ratio - 1 */
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unsigned int s_block_size_ratio_bits; /* log2(block_size_ratio) */
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char s_convert; /* flag whether byte ordering requires conversion */
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char s_kludge_symlinks; /* flag whether symlinks have a kludgey mode */
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char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
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/* if 0: they are disallowed (ENAMETOOLONG) */
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nlink_t s_link_max; /* max number of hard links to a file */
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unsigned int s_inodes_per_block; /* number of inodes per block */
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unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
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unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
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unsigned int s_ind_per_block; /* number of indirections per block */
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unsigned int s_ind_per_block_1; /* ind_per_block - 1 */
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unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
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unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
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unsigned int s_ind_per_block_2_1; /* ind_per_block ^ 2 - 1 */
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unsigned int s_ind_per_block_2_bits; /* log2(ind_per_block^2) */
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unsigned int s_ind_per_block_3; /* ind_per_block ^ 3 */
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unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
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unsigned int s_block_base; /* physical block number of block 0 */
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unsigned short s_fic_size; /* free inode cache size, NICINOD */
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unsigned short s_flc_size; /* free block list chunk size, NICFREE */
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/* The superblock is kept in a disk buffer: */
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struct buffer_head *s_bh;
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/* These are pointers into the disk buffer, to compensate for
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different superblock layout. */
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char * s_sbd; /* entire superblock data */
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unsigned short *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
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unsigned short *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
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unsigned short *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
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unsigned short *s_sb_flc_count; /* pointer to s_sbd->s_nfree */
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unsigned long *s_sb_flc_blocks; /* pointer to s_sbd->s_free */
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unsigned long *s_sb_total_free_blocks;/* pointer to s_sbd->s_tfree */
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unsigned long *s_sb_time; /* pointer to s_sbd->s_time */
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/* We keep those superblock entities that don't change here;
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this saves us an indirection and perhaps a conversion. */
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unsigned long s_firstinodezone; /* index of first inode zone */
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unsigned long s_firstdatazone; /* same as s_sbd->s_isize */
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unsigned long s_ninodes; /* total number of inodes */
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unsigned long s_ndatazones; /* total number of data zones */
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unsigned long s_nzones; /* same as s_sbd->s_fsize */
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};
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/* The fields s_block_size_ratio, s_toobig_block, s_sbd are currently unused. */
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/* sv_ == u.sysv_sb.s_ */
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#define sv_type u.sysv_sb.s_type
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#define sv_block_size u.sysv_sb.s_block_size
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#define sv_block_size_1 u.sysv_sb.s_block_size_1
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#define sv_block_size_bits u.sysv_sb.s_block_size_bits
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#define sv_block_size_ratio u.sysv_sb.s_block_size_ratio
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#define sv_block_size_ratio_1 u.sysv_sb.s_block_size_ratio_1
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#define sv_block_size_ratio_bits u.sysv_sb.s_block_size_ratio_bits
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#define sv_convert u.sysv_sb.s_convert
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#define sv_kludge_symlinks u.sysv_sb.s_kludge_symlinks
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#define sv_truncate u.sysv_sb.s_truncate
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#define sv_link_max u.sysv_sb.s_link_max
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#define sv_inodes_per_block u.sysv_sb.s_inodes_per_block
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#define sv_inodes_per_block_1 u.sysv_sb.s_inodes_per_block_1
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#define sv_inodes_per_block_bits u.sysv_sb.s_inodes_per_block_bits
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#define sv_ind_per_block u.sysv_sb.s_ind_per_block
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#define sv_ind_per_block_1 u.sysv_sb.s_ind_per_block_1
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#define sv_ind_per_block_bits u.sysv_sb.s_ind_per_block_bits
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#define sv_ind_per_block_2 u.sysv_sb.s_ind_per_block_2
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#define sv_ind_per_block_2_1 u.sysv_sb.s_ind_per_block_2_1
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#define sv_ind_per_block_2_bits u.sysv_sb.s_ind_per_block_2_bits
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#define sv_ind_per_block_3 u.sysv_sb.s_ind_per_block_3
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#define sv_toobig_block u.sysv_sb.s_toobig_block
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#define sv_block_base u.sysv_sb.s_block_base
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#define sv_fic_size u.sysv_sb.s_fic_size
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#define sv_flc_size u.sysv_sb.s_flc_size
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#define sv_bh u.sysv_sb.s_bh
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#define sv_sbd u.sysv_sb.s_sbd
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#define sv_sb_fic_count u.sysv_sb.s_sb_fic_count
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#define sv_sb_fic_inodes u.sysv_sb.s_sb_fic_inodes
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#define sv_sb_total_free_inodes u.sysv_sb.s_sb_total_free_inodes
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#define sv_sb_flc_count u.sysv_sb.s_sb_flc_count
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#define sv_sb_flc_blocks u.sysv_sb.s_sb_flc_blocks
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#define sv_sb_total_free_blocks u.sysv_sb.s_sb_total_free_blocks
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#define sv_sb_time u.sysv_sb.s_sb_time
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#define sv_firstinodezone u.sysv_sb.s_firstinodezone
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#define sv_firstdatazone u.sysv_sb.s_firstdatazone
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#define sv_ninodes u.sysv_sb.s_ninodes
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#define sv_ndatazones u.sysv_sb.s_ndatazones
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#define sv_nzones u.sysv_sb.s_nzones
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#endif
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