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| 30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| 33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
34 | */ |
| 35 | 35 | ||
| - | 36 | /** @addtogroup FileSystemImpl |
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| - | 37 | * @{ |
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| - | 38 | */ |
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| 36 | 39 | ||
| 37 | /* |
40 | /** |
| - | 41 | * @file super.h |
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| 38 | * The s_ninodes field gives the number of inodes available |
42 | * @brief The s_ninodes field gives the number of inodes available |
| 39 | * for files and directories, including the root directory. Inode 0 is |
43 | * for files and directories, including the root directory. Inode 0 is |
| 40 | * on the disk, but not used. Thus s_ninodes = 4 means that 5 bits will be |
44 | * on the disk, but not used. Thus s_ninodes = 4 means that 5 bits will be |
| 41 | * used in the bit map, bit 0, which is always 1 and not used, and bits 1-4 |
45 | * used in the bit map, bit 0, which is always 1 and not used, and bits 1-4 |
| 42 | * for files and directories. The disk layout is: |
46 | * for files and directories. |
| 43 | * |
- | |
| 44 | * Item # blocks |
- | |
| 45 | * boot block 1 |
- | |
| 46 | * super block 1 |
- | |
| 47 | * inode map s_imap_blocks |
- | |
| 48 | * zone map s_zmap_blocks |
- | |
| 49 | * inodes (s_ninodes + 'inodes per block' - 1)/'inodes per block' |
- | |
| 50 | * unused whatever is needed to fill out the current zone |
- | |
| 51 | * data zones (s_zones - s_firstdatazone) << s_log_zone_size |
- | |
| 52 | * |
47 | * |
| 53 | */ |
48 | */ |
| 54 | 49 | ||
| 55 | 50 | ||
| 56 | #ifndef _SUPER_H |
51 | #ifndef _SUPER_H |
| 57 | #define _SUPER_H |
52 | #define _SUPER_H |
| 58 | 53 | ||
| 59 | #define NIL_SUPER (super_block_t *) 0 |
54 | #define NIL_SUPER (super_block_t *) 0 /**< An empty super block */ |
| 60 | 55 | ||
| - | 56 | /** |
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| - | 57 | * The disk layout is: |
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| - | 58 | * |
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| - | 59 | * Item # blocks |
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| - | 60 | * boot block 1 |
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| - | 61 | * super block 1 |
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| - | 62 | * inode map s_imap_blocks |
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| - | 63 | * zone map s_zmap_blocks |
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| - | 64 | * inodes (s_ninodes + 'inodes per block' - 1)/'inodes per block' |
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| - | 65 | * unused whatever is needed to fill out the current zone |
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| - | 66 | * data zones (s_zones - s_firstdatazone) << s_log_zone_size |
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| - | 67 | */ |
|
| 61 | typedef struct { |
68 | typedef struct { |
| 62 | ino_t s_ninodes; /* # usable inodes on the minor device */ |
69 | ino_t s_ninodes; /**< # usable inodes on the minor device */ |
| 63 | zone1_t s_nzones; /* total device size, including bit maps etc */ |
70 | zone1_t s_nzones; /**< total device size, including bit maps etc */ |
| 64 | short s_imap_blocks; /* # of blocks used by inode bit map */ |
71 | short s_imap_blocks; /**< # of blocks used by inode bit map */ |
| 65 | short s_zmap_blocks; /* # of blocks used by zone bit map */ |
72 | short s_zmap_blocks; /**< # of blocks used by zone bit map */ |
| 66 | zone1_t s_firstdatazone; /* number of first data zone */ |
73 | zone1_t s_firstdatazone; /**< number of first data zone */ |
| 67 | short s_log_zone_size; /* log2 of blocks/zone */ |
74 | short s_log_zone_size; /**< log2 of blocks/zone */ |
| 68 | offset_t s_max_size; /* maximum file size on this device */ |
75 | offset_t s_max_size; /**< maximum file size on this device */ |
| 69 | short s_magic; /* magic number to recognize super-blocks */ |
76 | short s_magic; /**< magic number to recognize super-blocks */ |
| 70 | short s_pad; /* try to avoid compiler-dependent padding */ |
77 | short s_pad; /**< try to avoid compiler-dependent padding */ |
| 71 | zone_t s_zones; /* number of zones (replaces s_nzones in V2) */ |
78 | zone_t s_zones; /**< number of zones (replaces s_nzones in V2) */ |
| 72 | 79 | ||
| 73 | /* The following items are only used when the super_block is in memory. */ |
80 | /* The following items are only used when the super_block is in memory. */ |
| 74 | unsigned s_inodes_per_block; /* precalculated from magic number */ |
81 | unsigned s_inodes_per_block; /**< precalculated from magic number */ |
| 75 | int s_native; /* set to 1 iff not byte swapped file system */ |
82 | int s_native; /**< set to 1 iff not byte swapped file system */ |
| 76 | int s_version; /* file system version, zero means bad magic */ |
83 | int s_version; /**< file system version, zero means bad magic */ |
| 77 | int s_extend; /* 1 if file system support 30 chars in file name */ |
84 | int s_extend; /**< 1 if file system support 30 chars in file name */ |
| 78 | int s_ndzones; /* # direct zones in an inode */ |
85 | int s_ndzones; /**< # direct zones in an inode */ |
| 79 | int s_nindirs; /* # indirect zones per indirect block */ |
86 | int s_nindirs; /**< # indirect zones per indirect block */ |
| 80 | bit_t s_isearch; /* inodes below this bit number are in use */ |
87 | bit_t s_isearch; /**< inodes below this bit number are in use */ |
| 81 | bit_t s_zsearch; /* all zones below this bit number are in use*/ |
88 | bit_t s_zsearch; /**< all zones below this bit number are in use*/ |
| 82 | } super_block_t; |
89 | } super_block_t; |
| 83 | 90 | ||
| 84 | extern super_block_t* super_block; |
91 | extern super_block_t* super_block; /**< A variable to store the super block */ |
| 85 | 92 | ||
| 86 | #endif /* _SUPER_H */ |
93 | #endif /* _SUPER_H */ |
| - | 94 | ||
| - | 95 | /** |
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| - | 96 | * } |
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| - | 97 | */ |
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| - | 98 | ||