- Remove unused includes. - Add include guards to headers. - Use unsigned variables in case they're never going to hold a negative value. This causes GCC's complaints to disappear and should make flexelint a lot happier, too. - Make functions private when they're used only within a module. - Remove unused variables. - Add casts where appropriate.
67 lines
3 KiB
C
67 lines
3 KiB
C
#ifndef __MFS_SUPER_H__
|
|
#define __MFS_SUPER_H__
|
|
|
|
/* Super block table. The root file system and every mounted file system
|
|
* has an entry here. The entry holds information about the sizes of the bit
|
|
* maps and inodes. The s_ninodes field gives the number of inodes available
|
|
* for files and directories, including the root directory. Inode 0 is
|
|
* on the disk, but not used. Thus s_ninodes = 4 means that 5 bits will be
|
|
* used in the bit map, bit 0, which is always 1 and not used, and bits 1-4
|
|
* for files and directories. The disk layout is:
|
|
*
|
|
* Item # blocks
|
|
* boot block 1
|
|
* super block 1 (offset 1kB)
|
|
* inode map s_imap_blocks
|
|
* zone map s_zmap_blocks
|
|
* inodes (s_ninodes + 'inodes per block' - 1)/'inodes per block'
|
|
* unused whatever is needed to fill out the current zone
|
|
* data zones (s_zones - s_firstdatazone) << s_log_zone_size
|
|
*
|
|
* A super_block slot is free if s_dev == NO_DEV.
|
|
*/
|
|
|
|
EXTERN struct super_block {
|
|
ino_t s_ninodes; /* # usable inodes on the minor device */
|
|
zone1_t s_nzones; /* total device size, including bit maps etc */
|
|
short s_imap_blocks; /* # of blocks used by inode bit map */
|
|
short s_zmap_blocks; /* # of blocks used by zone bit map */
|
|
zone1_t s_firstdatazone_old; /* number of first data zone (small) */
|
|
short s_log_zone_size; /* log2 of blocks/zone */
|
|
short s_pad; /* try to avoid compiler-dependent padding */
|
|
off_t s_max_size; /* maximum file size on this device */
|
|
zone_t s_zones; /* number of zones (replaces s_nzones in V2) */
|
|
short s_magic; /* magic number to recognize super-blocks */
|
|
|
|
/* The following items are valid on disk only for V3 and above */
|
|
|
|
/* The block size in bytes. Minimum MIN_BLOCK SIZE. SECTOR_SIZE
|
|
* multiple. If V1 or V2 filesystem, this should be
|
|
* initialised to STATIC_BLOCK_SIZE.
|
|
*/
|
|
short s_pad2; /* try to avoid compiler-dependent padding */
|
|
unsigned short s_block_size; /* block size in bytes. */
|
|
char s_disk_version; /* filesystem format sub-version */
|
|
|
|
/* The following items are only used when the super_block is in memory. */
|
|
|
|
/*struct inode *s_isup;*/ /* inode for root dir of mounted file sys */
|
|
/*struct inode *s_imount;*/ /* inode mounted on */
|
|
unsigned s_inodes_per_block; /* precalculated from magic number */
|
|
zone_t s_firstdatazone; /* number of first data zone (big) */
|
|
dev_t s_dev; /* whose super block is this? */
|
|
int s_rd_only; /* set to 1 iff file sys mounted read only */
|
|
int s_native; /* set to 1 iff not byte swapped file system */
|
|
int s_version; /* file system version, zero means bad magic */
|
|
int s_ndzones; /* # direct zones in an inode */
|
|
int s_nindirs; /* # indirect zones per indirect block */
|
|
bit_t s_isearch; /* inodes below this bit number are in use */
|
|
bit_t s_zsearch; /* all zones below this bit number are in use*/
|
|
char s_is_root;
|
|
} superblock;
|
|
|
|
#define IMAP 0 /* operating on the inode bit map */
|
|
#define ZMAP 1 /* operating on the zone bit map */
|
|
|
|
#endif
|
|
|