src/libfs/raw.c

   1 /*
   2  * <raw.c>
   3  *
   4  * Open Hack'Ware BIOS raw file system management
   5  *
   6  * Copyright (c) 2004-2005 Jocelyn Mayer
   7  *
   8  *   This program is free software; you can redistribute it and/or
   9  *   modify it under the terms of the GNU General Public License V2
  10  *   as published by the Free Software Foundation
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include "bios.h"
  25 #include "../libpart/libpart.h"
  26 #include "libfs.h"
  27
  28 /* Raw filesystem (ie no filesystem) */
  29 static inode_t *fs_raw_get_inode (inode_t *parent, const unsigned char *name)
  30 {
  31     inode_t *new;
  32     fs_t *fs;
  33     int flags;
  34
  35     if (parent != NULL) {
  36         return NULL;
  37     }
  38     /* Open root inode */
  39     flags = INODE_TYPE_DIR;
  40     fs = NULL;
  41     new = malloc(sizeof(inode_t));
  42     memset(new, 0, sizeof(inode_t));
  43     new->flags = flags;
  44     new->name = strdup(name);
  45
  46     return new;
  47 }
  48
  49 static void fs_raw_put_inode (inode_t *inode)
  50 {
  51     free(inode);
  52 }
  53
  54 static uint32_t fs_raw_map_bloc (unused inode_t *inode, uint32_t bloc)
  55 {
  56     if (inode != NULL
  57         /* XXX: can't figure out why I did this... */
  58         /* && inode == inode->fs->bootfile*/
  59         )
  60          bloc += inode->blocs[0].bloc;
  61
  62     return bloc;
  63 }
  64
  65 static inode_t *fs_raw_get_special_inode (fs_t *fs, int type)
  66 {
  67     const unsigned char *name;
  68     inode_t *new, *parent, **inp;
  69     int flags;
  70
  71     new = NULL;
  72     name = NULL;
  73     parent = NULL;
  74     inp = NULL;
  75     flags = 0;
  76     switch (type) {
  77     case FILE_ROOT:
  78         if (fs->root != NULL) {
  79             new = fs->root;
  80         } else {
  81             flags = INODE_TYPE_DIR;
  82             parent = NULL;
  83             name = NULL;
  84             inp = &fs->root;
  85         }
  86         break;
  87     case FILE_BOOT:
  88         if (fs->bootfile != NULL) {
  89             dprintf("bootfile already exists\n");
  90             new = fs->bootfile;
  91         } else {
  92             new = part_private_get(fs_part(fs));
  93             if (fs->bootdir == NULL) {
  94                 dprintf("Get boot directory\n");
  95                 fs->bootdir = fs_raw_get_special_inode(fs, FILE_BOOTDIR);
  96             }
  97             parent = fs->bootdir;
  98             if (new != NULL) {
  99                 dprintf("Fix bootfile\n");
 100                 new->parent = parent;
 101                 new->fs = fs;
 102             } else {
 103                 dprintf("New bootfile\n");
 104                 flags = INODE_TYPE_FILE | INODE_FLAG_EXEC | INODE_FLAG_BOOT;
 105                 name = "ofwboot";
 106                 inp = &fs->bootfile;
 107             }
 108         }
 109         break;
 110     case FILE_BOOTDIR:
 111         if (fs->bootdir != NULL) {
 112             new = fs->bootdir;
 113         } else {
 114             flags = INODE_TYPE_DIR;
 115             parent = fs->root;
 116             name = "boot";
 117             inp = &fs->bootdir;
 118         }
 119         break;
 120     default:
 121         return NULL;
 122     }
 123     if (new == NULL) {
 124         new = malloc(sizeof(inode_t));
 125         memset(new, 0, sizeof(inode_t));
 126         new->flags = flags;
 127         new->parent = parent;
 128         if (name != NULL)
 129             new->name = strdup(name);
 130         new->fs = fs;
 131         *inp = new;
 132     }
 133
 134     return new;
 135 }
 136
 137 static fs_ops_t fs_ops_raw = {
 138     &fs_raw_get_inode,
 139     &fs_raw_put_inode,
 140     &fs_raw_map_bloc,
 141     &fs_raw_get_special_inode,
 142 };
 143
 144 int fs_raw_set_bootfile (part_t *part,
 145                          uint32_t start_bloc, uint32_t start_offset,
 146                          uint32_t size_bloc, uint32_t size_offset)
 147 {
 148     inode_t *new;
 149
 150     new = malloc(sizeof(inode_t));
 151     if (new == NULL)
 152         return -1;
 153     DPRINTF("%s: pos %d %d size %d %d\n", __func__, start_bloc, start_offset,
 154             size_bloc, size_offset);
 155     memset(new, 0, sizeof(inode_t));
 156     new->flags = INODE_TYPE_FILE | INODE_FLAG_EXEC | INODE_FLAG_BOOT;
 157     new->name = "ofwboot";
 158     new->blocs[0].bloc = start_bloc;
 159     new->blocs[0].offset = start_offset;
 160     new->size.bloc = size_bloc;
 161     new->size.offset = size_offset;
 162     new->nb_blocs = size_bloc;
 163     part_private_set(part, new);
 164
 165     return 0;
 166 }
 167
 168 int fs_raw_probe (part_t *part, uint32_t *size,
 169                   fs_ops_t **fs_ops, unsigned char **name,
 170                   unused void **private)
 171 {
 172     DPRINTF("%s: %p map_bloc %p\n", __func__, &fs_ops_raw, &fs_raw_map_bloc);
 173     *fs_ops = &fs_ops_raw;
 174     *name = "Raw FS";
 175     *size = part_size(part);
 176
 177     return FS_TYPE_RAW;
 178 }