| 1 | /*
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| 2 | * Copyright (c) 2011 Maurizio Lombardi
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 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 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #ifndef _MFS_H_
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| 34 | #define _MFS_H_
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| 35 |
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| 36 | #include <minix.h>
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| 37 | #include <macros.h>
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| 38 | #include <block.h>
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| 39 | #include <libfs.h>
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| 40 | #include <adt/list.h>
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| 41 | #include <mem.h>
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| 42 | #include <stdio.h>
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| 43 | #include <stdlib.h>
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| 44 | #include <errno.h>
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| 45 | #include <assert.h>
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| 46 | #include <stdbool.h>
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| 47 | #include <macros.h>
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| 48 | #include "../../vfs/vfs.h"
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| 49 |
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| 50 | #define NAME "mfs"
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| 51 |
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| 52 | /* #define DEBUG_MODE */
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| 53 |
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| 54 | #ifdef DEBUG_MODE
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| 55 | #define mfsdebug(...) printf(__VA_ARGS__)
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| 56 | #else
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| 57 | #define mfsdebug(...)
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| 58 | #endif
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| 59 |
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| 60 | #define MFS_BMAP_START_BLOCK(sbi, bid) \
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| 61 | ((bid) == BMAP_ZONE ? 2 + (sbi)->ibmap_blocks : 2)
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| 62 |
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| 63 | #define MFS_BMAP_SIZE_BITS(sbi, bid) \
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| 64 | ((bid) == BMAP_ZONE ? (sbi)->nzones - (sbi)->firstdatazone - 1 : \
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| 65 | (sbi)->ninodes - 1)
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| 66 |
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| 67 | #define MFS_BMAP_SIZE_BLOCKS(sbi, bid) \
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| 68 | ((bid) == BMAP_ZONE ? (sbi)->zbmap_blocks : (sbi)->ibmap_blocks)
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| 69 |
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| 70 | typedef uint32_t bitchunk_t;
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| 71 |
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| 72 | typedef enum {
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| 73 | BMAP_ZONE,
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| 74 | BMAP_INODE
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| 75 | } bmap_id_t;
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| 76 |
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| 77 | typedef enum {
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| 78 | MFS_VERSION_V1 = 1,
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| 79 | MFS_VERSION_V2,
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| 80 | MFS_VERSION_V3
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| 81 | } mfs_version_t;
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| 82 |
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| 83 | /* Generic MinixFS superblock */
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| 84 | struct mfs_sb_info {
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| 85 | uint32_t ninodes;
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| 86 | uint32_t nzones;
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| 87 | unsigned long ibmap_blocks;
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| 88 | unsigned long zbmap_blocks;
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| 89 | unsigned long firstdatazone;
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| 90 | int log2_zone_size;
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| 91 | int block_size;
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| 92 | uint32_t max_file_size;
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| 93 | uint16_t magic;
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| 94 | uint16_t state;
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| 95 |
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| 96 | /* The following fields do not exist on disk but only in memory */
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| 97 | unsigned long itable_size;
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| 98 | mfs_version_t fs_version;
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| 99 | int ino_per_block;
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| 100 | size_t dirsize;
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| 101 | int itable_off;
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| 102 | unsigned max_name_len;
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| 103 | bool long_names;
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| 104 | bool native;
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| 105 | unsigned isearch;
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| 106 | unsigned zsearch;
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| 107 |
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| 108 | /*
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| 109 | * Indicates wether if the cached number of free zones
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| 110 | * is to be considered valid or not.
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| 111 | */
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| 112 | bool nfree_zones_valid;
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| 113 | /*
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| 114 | * Cached number of free zones, used to avoid to scan
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| 115 | * the whole bitmap every time the mfs_free_block_count()
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| 116 | * is invoked.
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| 117 | */
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| 118 | unsigned nfree_zones;
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| 119 | };
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| 120 |
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| 121 | /* Generic MinixFS inode */
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| 122 | struct mfs_ino_info {
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| 123 | uint16_t i_mode;
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| 124 | uint16_t i_nlinks;
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| 125 | int16_t i_uid;
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| 126 | uint16_t i_gid;
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| 127 | size_t i_size;
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| 128 | int32_t i_atime;
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| 129 | int32_t i_mtime;
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| 130 | int32_t i_ctime;
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| 131 | /* Block numbers for direct zones */
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| 132 | uint32_t i_dzone[V2_NR_DIRECT_ZONES];
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| 133 | /* Block numbers for indirect zones */
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| 134 | uint32_t i_izone[V2_NR_INDIRECT_ZONES];
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| 135 |
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| 136 | /* The following fields do not exist on disk but only in memory */
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| 137 | bool dirty;
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| 138 | fs_index_t index;
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| 139 | };
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| 140 |
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| 141 | /* Generic MFS directory entry */
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| 142 | struct mfs_dentry_info {
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| 143 | uint32_t d_inum;
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| 144 | char d_name[MFS3_MAX_NAME_LEN + 1];
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| 145 |
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| 146 | /* The following fields do not exist on disk but only in memory */
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| 147 |
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| 148 | /* Index of the dentry in the list */
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| 149 | unsigned index;
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| 150 | /* Pointer to the node at witch the dentry belongs */
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| 151 | struct mfs_node *node;
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| 152 | };
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| 153 |
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| 154 | struct mfs_instance {
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| 155 | service_id_t service_id;
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| 156 | struct mfs_sb_info *sbi;
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| 157 | unsigned open_nodes_cnt;
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| 158 | };
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| 159 |
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| 160 | /* MinixFS node in core */
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| 161 | struct mfs_node {
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| 162 | struct mfs_ino_info *ino_i;
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| 163 | struct mfs_instance *instance;
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| 164 | unsigned refcnt;
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| 165 | fs_node_t *fsnode;
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| 166 | ht_link_t link;
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| 167 | };
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| 168 |
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| 169 | /* mfs_ops.c */
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| 170 | extern vfs_out_ops_t mfs_ops;
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| 171 | extern libfs_ops_t mfs_libfs_ops;
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| 172 |
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| 173 | extern errno_t
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| 174 | mfs_global_init(void);
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| 175 |
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| 176 | /* mfs_inode.c */
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| 177 | extern errno_t
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| 178 | mfs_get_inode(struct mfs_instance *inst, struct mfs_ino_info **ino_i,
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| 179 | fs_index_t index);
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| 180 |
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| 181 | extern errno_t
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| 182 | mfs_put_inode(struct mfs_node *mnode);
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| 183 |
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| 184 | extern errno_t
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| 185 | mfs_inode_shrink(struct mfs_node *mnode, size_t size_shrink);
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| 186 |
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| 187 | /* mfs_rw.c */
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| 188 | extern errno_t
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| 189 | mfs_read_map(uint32_t *b, const struct mfs_node *mnode, const uint32_t pos);
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| 190 |
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| 191 | extern errno_t
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| 192 | mfs_write_map(struct mfs_node *mnode, uint32_t pos, uint32_t new_zone,
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| 193 | uint32_t *old_zone);
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| 194 |
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| 195 | extern errno_t
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| 196 | mfs_prune_ind_zones(struct mfs_node *mnode, size_t new_size);
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| 197 |
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| 198 | /* mfs_dentry.c */
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| 199 | extern errno_t
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| 200 | mfs_read_dentry(struct mfs_node *mnode,
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| 201 | struct mfs_dentry_info *d_info, unsigned index);
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| 202 |
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| 203 | extern errno_t
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| 204 | mfs_write_dentry(struct mfs_dentry_info *d_info);
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| 205 |
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| 206 | extern errno_t
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| 207 | mfs_remove_dentry(struct mfs_node *mnode, const char *d_name);
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| 208 |
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| 209 | extern errno_t
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| 210 | mfs_insert_dentry(struct mfs_node *mnode, const char *d_name, fs_index_t d_inum);
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| 211 |
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| 212 | /* mfs_balloc.c */
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| 213 | extern errno_t
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| 214 | mfs_alloc_inode(struct mfs_instance *inst, uint32_t *inum);
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| 215 |
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| 216 | extern errno_t
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| 217 | mfs_free_inode(struct mfs_instance *inst, uint32_t inum);
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| 218 |
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| 219 | extern errno_t
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| 220 | mfs_alloc_zone(struct mfs_instance *inst, uint32_t *zone);
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| 221 |
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| 222 | extern errno_t
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| 223 | mfs_free_zone(struct mfs_instance *inst, uint32_t zone);
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| 224 |
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| 225 | extern errno_t
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| 226 | mfs_count_free_zones(struct mfs_instance *inst, uint32_t *zones);
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| 227 |
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| 228 | extern errno_t
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| 229 | mfs_count_free_inodes(struct mfs_instance *inst, uint32_t *inodes);
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| 230 |
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| 231 |
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| 232 | /* mfs_utils.c */
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| 233 | extern uint16_t
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| 234 | conv16(bool native, uint16_t n);
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| 235 |
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| 236 | extern uint32_t
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| 237 | conv32(bool native, uint32_t n);
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| 238 |
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| 239 | extern uint64_t
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| 240 | conv64(bool native, uint64_t n);
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| 241 |
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| 242 | #endif
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| 243 |
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| 244 | /**
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| 245 | * @}
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| 246 | */
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| 247 |
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