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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 |