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 90