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| 2404 | konopa | 1 | /* |
| 2 | * Copyright (c) 1987,1997, Prentice Hall |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use of the MINIX operating system in source and |
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| 6 | * binary forms, with or without modification, are permitted provided |
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| 7 | * that the following conditions are met: |
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| 8 | |||
| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | |||
| 12 | * - Redistributions in binary form must reproduce the above |
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| 13 | * copyright notice, this list of conditions and the following |
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| 14 | * disclaimer in the documentation and/or other materials provided |
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| 15 | * with the distribution. |
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| 16 | |||
| 17 | * - Neither the name of Prentice Hall nor the names of the software |
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| 18 | * authors or contributors may be used to endorse or promote |
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| 19 | * products derived from this software without specific prior |
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| 20 | * written permission. |
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| 21 | |||
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND |
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| 23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 26 | * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE |
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| 27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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| 30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
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| 32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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| 33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 34 | */ |
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| 2435 | jelen | 35 | |
| 36 | /** @addtogroup FileSystemImpl |
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| 37 | * @{ |
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| 38 | */ |
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| 2404 | konopa | 39 | |
| 2435 | jelen | 40 | /** |
| 41 | * @file super.h |
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| 42 | * @brief The s_ninodes field gives the number of inodes available |
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| 43 | * for files and directories, including the root directory. Inode 0 is |
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| 44 | * on the disk, but not used. Thus s_ninodes = 4 means that 5 bits will be |
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| 45 | * used in the bit map, bit 0, which is always 1 and not used, and bits 1-4 |
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| 46 | * for files and directories. |
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| 2382 | konopa | 47 | * |
| 48 | */ |
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| 49 | |||
| 50 | |||
| 51 | #ifndef _SUPER_H |
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| 52 | #define _SUPER_H |
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| 53 | |||
| 2435 | jelen | 54 | #define NIL_SUPER (super_block_t *) 0 /**< An empty super block */ |
| 2382 | konopa | 55 | |
| 2435 | jelen | 56 | /** |
| 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 | */ |
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| 2382 | konopa | 68 | typedef struct { |
| 2435 | jelen | 69 | ino_t s_ninodes; /**< # usable inodes on the minor device */ |
| 70 | zone1_t s_nzones; /**< total device size, including bit maps etc */ |
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| 71 | short s_imap_blocks; /**< # of blocks used by inode bit map */ |
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| 72 | short s_zmap_blocks; /**< # of blocks used by zone bit map */ |
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| 73 | zone1_t s_firstdatazone; /**< number of first data zone */ |
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| 74 | short s_log_zone_size; /**< log2 of blocks/zone */ |
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| 75 | offset_t s_max_size; /**< maximum file size on this device */ |
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| 76 | short s_magic; /**< magic number to recognize super-blocks */ |
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| 77 | short s_pad; /**< try to avoid compiler-dependent padding */ |
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| 78 | zone_t s_zones; /**< number of zones (replaces s_nzones in V2) */ |
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| 2382 | konopa | 79 | |
| 80 | /* The following items are only used when the super_block is in memory. */ |
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| 2435 | jelen | 81 | unsigned s_inodes_per_block; /**< precalculated from magic number */ |
| 82 | int s_native; /**< set to 1 iff not byte swapped file system */ |
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| 83 | int s_version; /**< file system version, zero means bad magic */ |
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| 84 | int s_extend; /**< 1 if file system support 30 chars in file name */ |
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| 85 | int s_ndzones; /**< # direct zones in an inode */ |
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| 86 | int s_nindirs; /**< # indirect zones per indirect block */ |
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| 87 | bit_t s_isearch; /**< inodes below this bit number are in use */ |
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| 88 | bit_t s_zsearch; /**< all zones below this bit number are in use*/ |
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| 2382 | konopa | 89 | } super_block_t; |
| 90 | |||
| 2435 | jelen | 91 | extern super_block_t* super_block; /**< A variable to store the super block */ |
| 2382 | konopa | 92 | |
| 93 | #endif /* _SUPER_H */ |
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| 2435 | jelen | 94 | |
| 95 | /** |
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| 96 | * } |
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| 97 | */ |
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| 98 |