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| 2 | pj | 1 | /* |
| 2 | * Project: HARTIK (HA-rd R-eal TI-me K-ernel) |
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| 3 | * |
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| 4 | * Coordinators: Giorgio Buttazzo <giorgio@sssup.it> |
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| 5 | * Gerardo Lamastra <gerardo@sssup.it> |
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| 6 | * |
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| 7 | * Authors : Massimiliano Giorgi <massy@hartik.sssup.it> |
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| 8 | * (see authors.txt for full list of hartik's authors) |
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| 9 | * |
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| 10 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 11 | * |
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| 12 | * http://www.sssup.it |
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| 13 | * http://retis.sssup.it |
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| 14 | * http://hartik.sssup.it |
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| 15 | */ |
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| 16 | |||
| 17 | /* |
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| 18 | * Copyright (C) 2000 Massimiliano Giorgi |
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| 19 | * |
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| 20 | * This program is free software; you can redistribute it and/or modify |
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| 21 | * it under the terms of the GNU General Public License as published by |
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| 22 | * the Free Software Foundation; either version 2 of the License, or |
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| 23 | * (at your option) any later version. |
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| 24 | * |
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| 25 | * This program is distributed in the hope that it will be useful, |
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| 26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 28 | * GNU General Public License for more details. |
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| 29 | * |
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| 30 | * You should have received a copy of the GNU General Public License |
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| 31 | * along with this program; if not, write to the Free Software |
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| 32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 33 | * |
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| 34 | */ |
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| 35 | |||
| 36 | /* |
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| 37 | * CVS : $Id: super.h,v 1.1.1.1 2002-03-29 14:12:50 pj Exp $ |
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| 38 | * |
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| 39 | * File: $File$ |
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| 40 | * Revision: $Revision: 1.1.1.1 $ |
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| 41 | * Last update: $Date: 2002-03-29 14:12:50 $ |
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| 42 | */ |
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| 43 | |||
| 44 | /*** |
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| 45 | This file contains the struct super_block and the functions to manage super blocks. |
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| 46 | ***/ |
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| 47 | |||
| 48 | #ifndef __SUPER_H__ |
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| 49 | #define __SUPER_H__ |
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| 50 | |||
| 51 | #include <fs/types.h> |
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| 52 | #include <fs/fsconf.h> |
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| 53 | #include <fs/mount.h> |
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| 54 | |||
| 55 | #ifdef MSDOS_FILESYSTEM |
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| 56 | #include "msdos/msdos_s.h" |
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| 57 | #endif |
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| 58 | |||
| 59 | struct super_block { |
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| 60 | |||
| 61 | /* this are used to build a tree of superblock */ |
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| 62 | |||
| 63 | /*+ parent of this superblock +*/ |
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| 64 | struct super_block *sb_parent; |
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| 65 | /*+ childs of this superblock +*/ |
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| 66 | struct super_block *sb_childs; |
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| 67 | /*+ to build a list of childs +*/ |
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| 68 | struct super_block *sb_next; |
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| 69 | |||
| 70 | /*+ device on which the super block reside +*/ |
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| 71 | __dev_t sb_dev; |
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| 72 | |||
| 73 | /*+ inode of the root directory entry +*/ |
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| 74 | struct inode *sb_root; |
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| 75 | /*+ directory entry into the tree of the root directory +*/ |
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| 76 | struct dentry *sb_droot; |
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| 77 | /*+ file-system of the super block +*/ |
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| 78 | struct file_system_type *sb_fs; |
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| 79 | /*+ pointer to a super operations structure (see superop.h) +*/ |
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| 80 | struct super_operations *sb_op; |
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| 81 | /*+ pointer to a dentry operations structure (see dentryop.h) +*/ |
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| 82 | struct dentry_operations *sb_dop; |
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| 83 | /*+ mount options (see fs/mount.h) +*/ |
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| 84 | struct mount_opts sb_mopts; |
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| 85 | |||
| 86 | /*+ busy counter (for every operation in progress using this super) +*/ |
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| 87 | int sb_busycount; |
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| 88 | |||
| 89 | /* flags */ |
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| 90 | /*+ set if this element is valid and used +*/ |
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| 91 | __uint32_t sb_used:1; |
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| 92 | /*+ set if blocked (if only one operation must be done) +*/ |
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| 93 | __uint32_t sb_blocked:1; |
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| 94 | |||
| 95 | union { |
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| 96 | #ifdef MSDOS_FILESYSTEM |
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| 97 | /*+ msdos filesystem specific super block data +*/ |
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| 98 | struct msdos_super_block msdos_sb; |
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| 99 | #endif |
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| 100 | /*+ not used +*/ |
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| 101 | unsigned dummy; |
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| 102 | } u; |
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| 103 | }; |
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| 104 | |||
| 105 | /*+ module "super" initialization +*/ |
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| 106 | int super_init(void); |
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| 107 | |||
| 108 | struct super_block *super_getblock(void); |
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| 109 | void super_freeblock(struct super_block *ptr); |
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| 110 | int super_enumdevice(int(*func)(__dev_t)); |
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| 111 | |||
| 112 | struct super_block *get_root_superblock(void); |
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| 113 | void set_root_superblock(struct super_block *sb); |
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| 114 | static __inline__ __dev_t get_root_device(void) { return get_root_superblock()->sb_dev; } |
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| 115 | |||
| 116 | struct super_block *super_aquire(__dev_t dev); |
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| 117 | void super_release(struct super_block *sb); |
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| 118 | |||
| 119 | int super_incbusy(struct super_block *sb); |
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| 120 | void super_decbusy(struct super_block *sb); |
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| 121 | |||
| 122 | void super_insertintotree(struct super_block *sb, struct super_block *psb); |
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| 123 | void super_removefromtree(struct super_block *sb); |
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| 124 | |||
| 125 | #endif |
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| 126 |