| 0,0 → 1,50 |
|---|
| /* |
| * 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 |
| * 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 |
| * |
| */ |
| |
| |
| #ifndef _SUPER_H |
| #define _SUPER_H |
| |
| #define NIL_SUPER (super_block_t *) 0 |
| |
| typedef struct { |
| 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; /* number of first data zone */ |
| short s_log_zone_size; /* log2 of blocks/zone */ |
| offset_t s_max_size; /* maximum file size on this device */ |
| short s_magic; /* magic number to recognize super-blocks */ |
| short s_pad; /* try to avoid compiler-dependent padding */ |
| zone_t s_zones; /* number of zones (replaces s_nzones in V2) */ |
| |
| /* The following items are only used when the super_block is in memory. */ |
| unsigned s_inodes_per_block; /* precalculated from magic number */ |
| int s_native; /* set to 1 iff not byte swapped file system */ |
| int s_version; /* file system version, zero means bad magic */ |
| int s_extend; /* 1 if file system support 30 chars in file name */ |
| 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*/ |
| } super_block_t; |
| |
| extern super_block_t* super_block; |
| |
| #endif /* _SUPER_H */ |