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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 inode.h |
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| 42 | * @brief Inode table definition. |
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| 43 | */ |
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| 2404 | konopa | 44 | |
| 2372 | konopa | 45 | #ifndef _INODE_H |
| 46 | #define _INODE_H |
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| 47 | |||
| 48 | #include "super.h" |
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| 49 | |||
| 2435 | jelen | 50 | #define NIL_INODE (inode_t *) 0 /**< indicates absence of inode slot */ |
| 2372 | konopa | 51 | |
| 2435 | jelen | 52 | #define NO_SEEK 0 /**< i_seek = NO_SEEK if last op was not SEEK */ |
| 53 | #define ISEEK 1 /**< i_seek = ISEEK if last op was SEEK */ |
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| 2372 | konopa | 54 | |
| 2435 | jelen | 55 | /* |
| 56 | * This table holds inodes that are currently in use. In some |
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| 57 | * cases they have been opened by an open() or creat() system call, in other |
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| 58 | * cases the file system itself needs the inode for one reason or another, |
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| 59 | * such as to search a directory for a path name. |
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| 60 | * The first part of the struct holds fields that are present on the |
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| 61 | * disk; the second part holds fields not present on the disk. |
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| 62 | */ |
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| 2372 | konopa | 63 | typedef struct { |
| 2435 | jelen | 64 | mode_t i_mode; /**< file type, protection, etc. */ |
| 65 | nlink_t i_nlinks; /**< how many links to this file */ |
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| 66 | offset_t i_size; /**< current file size in bytes */ |
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| 67 | zone_t i_zone[V2_NR_TZONES]; /**< zone numbers for direct, ind, and dbl ind */ |
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| 2372 | konopa | 68 | |
| 69 | /* The following items are not present on the disk. */ |
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| 2435 | jelen | 70 | dev_t i_dev; /**< which device is the inode on */ |
| 71 | ino_t i_num; /**< inode number on its (minor) device */ |
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| 72 | int i_count; /**< # times inode used; 0 means slot is free */ |
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| 73 | int i_ndzones; /**< # direct zones (NR_DZONES) */ |
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| 74 | int i_nindirs; /**< # indirect zones per indirect block */ |
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| 75 | super_block_t *i_sp; /**< pointer to super block for inode's device */ |
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| 76 | char i_seek; /**< set on LSEEK, cleared on READ */ |
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| 2372 | konopa | 77 | } inode_t; |
| 78 | |||
| 79 | extern inode_t inode[NR_INODES]; |
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| 80 | |||
| 81 | #endif /* _INODE_H */ |
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| 2435 | jelen | 82 | |
| 83 | /** |
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| 84 | * } |
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| 85 | */ |
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| 86 |