1 | /* |
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2 | * fat32/fat32_context.c - fat32 context related operations |
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3 | * |
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4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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6 | * |
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7 | * This file is part of ALMOS-kernel. |
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8 | * |
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9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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10 | * under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; version 2.0 of the License. |
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12 | * |
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13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |
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23 | #include <kdmsg.h> |
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24 | #include <chdev.h> |
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25 | #include <driver.h> |
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26 | #include <kmem.h> |
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27 | #include <rwlock.h> |
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28 | #include <string.h> |
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29 | #include <page.h> |
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30 | #include <cluster.h> |
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31 | #include <thread.h> |
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32 | #include <mapper.h> |
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33 | #include <atomic.h> |
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34 | #include <vfs.h> |
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35 | |
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36 | #include <fat32.h> |
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37 | #include <fat32-private.h> |
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38 | |
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39 | static error_t vfat_context_init(struct vfat_context_s *ctx) |
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40 | { |
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41 | size_t blk_sz; |
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42 | dev_params_t params; |
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43 | struct vfat_bpb_s *bpb; |
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44 | struct page_s *page; |
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45 | struct mapper_s *mapper; |
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46 | |
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47 | if((ctx->dev->op.dev.get_params(ctx->dev, ¶ms))) |
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48 | return -1; |
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49 | |
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50 | blk_sz = params.sector_size; |
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51 | ctx->bytes_per_sector = blk_sz; |
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52 | mapper = ctx->mapper; |
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53 | |
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54 | page = mapper_get_page(mapper, 0, MAPPER_SYNC_OP); |
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55 | |
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56 | if(page == NULL) |
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57 | { |
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58 | printk(ERROR, "ERROR: VFAT context_init: I/O error, could not read bpb from the device.\n"); |
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59 | return -1; |
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60 | } |
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61 | |
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62 | bpb = (struct vfat_bpb_s *) ppm_page2addr(page); |
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63 | |
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64 | ctx->bytes_per_sector = bpb->BPB_BytsPerSec; |
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65 | |
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66 | if (blk_sz != ctx->bytes_per_sector) |
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67 | PANIC("VFAT drv error: bpb/device block size mismatch bpb block %d, devBlk %d\n", |
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68 | ctx->bytes_per_sector, blk_sz); |
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69 | |
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70 | ctx->fat_begin_lba = bpb->BPB_RsvdSecCnt; |
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71 | ctx->fat_blk_count = bpb->BPB_FATSz32; |
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72 | ctx->cluster_begin_lba = ctx->fat_begin_lba + (bpb->BPB_NumFATs * bpb->BPB_FATSz32); |
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73 | ctx->sectors_per_cluster = bpb->BPB_SecPerClus; |
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74 | ctx->rootdir_first_cluster = bpb->BPB_RootClus; |
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75 | ctx->bytes_per_cluster = ctx->bytes_per_sector * ctx->sectors_per_cluster; |
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76 | ctx->last_allocated_sector = ctx->fat_begin_lba; |
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77 | ctx->last_allocated_index = 2; |
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78 | |
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79 | vfat_dmsg(1, |
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80 | "%s:\n\tbegin_lba %d\n\tblk_count %d\n\tcluster_begin_lba %d\n\t" |
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81 | "sectors_per_cluster %d\n\trootdir_first_cluster %d\n\tbytes_per_cluster %d\n\t" |
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82 | "MediaType %x (@%x)\n", |
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83 | __FUNCTION__, |
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84 | ctx->fat_begin_lba, |
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85 | ctx->fat_blk_count, |
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86 | ctx->cluster_begin_lba, |
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87 | ctx->sectors_per_cluster, |
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88 | ctx->rootdir_first_cluster, |
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89 | ctx->bytes_per_cluster, |
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90 | bpb->BPB_Media, |
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91 | &bpb->BPB_Media); |
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92 | |
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93 | vfat_dmsg(1, "DEBUG: context_init: last allocated sector %d, last allocated index %d\n", |
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94 | ctx->last_allocated_sector, ctx->last_allocated_index); |
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95 | |
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96 | |
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97 | return 0; |
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98 | } |
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99 | |
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100 | VFS_CREATE_CONTEXT(vfat_create_context) |
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101 | { |
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102 | kmem_req_t req; |
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103 | struct vfat_context_s *vfat_ctx; |
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104 | struct mapper_s *mapper; |
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105 | error_t err; |
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106 | |
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107 | vfat_dmsg(1, "%s: started\n", __FUNCTION__); |
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108 | |
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109 | vfat_ctx = &context->ctx_vfat; |
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110 | |
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111 | vfat_ctx->dev = context->ctx_dev;//necessary ? |
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112 | |
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113 | rwlock_init(&vfat_ctx->lock); |
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114 | |
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115 | req.type = KMEM_MAPPER; |
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116 | req.size = sizeof(*mapper); |
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117 | mapper = kmem_alloc(&req); |
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118 | |
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119 | if(mapper == NULL) |
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120 | { |
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121 | err = ENOMEM; |
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122 | goto fail_mapper; |
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123 | } |
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124 | |
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125 | err = mapper_init(mapper, &vfat_inode_mapper_op, NULL, vfat_ctx); |
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126 | |
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127 | if(err) |
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128 | { |
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129 | printk(ERROR, "ERROR: %s: failed to init mapper, err %d\n", __FUNCTION__, err); |
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130 | goto fail_mapper_init; |
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131 | } |
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132 | |
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133 | vfat_ctx->mapper = mapper; |
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134 | vfat_ctx->fat_cid = current_cid; |
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135 | |
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136 | if ((err = vfat_context_init(vfat_ctx))) |
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137 | { |
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138 | printk(ERROR, "ERROR: vfat_create_context: INITIALIZING VFAT CONTEXT err %d\n",err); |
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139 | goto fail_ctx_init; |
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140 | } |
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141 | |
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142 | context->ctx_flags |= VFS_FS_USE_MAPPER; |
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143 | context->ctx_type = VFS_VFAT_TYPE; |
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144 | context->ctx_blksize = vfat_ctx->bytes_per_sector; |
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145 | context->ctx_op = (struct vfs_context_op_s *) &vfat_ctx_op; |
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146 | context->ctx_inode_op = (struct vfs_inode_op_s *) &vfat_i_op; |
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147 | context->ctx_dirent_op = (struct vfs_dirent_op_s *) &vfat_d_op; |
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148 | context->ctx_file_op = (struct vfs_file_op_s *) &vfat_f_op; |
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149 | |
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150 | return 0; |
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151 | |
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152 | fail_ctx_init: |
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153 | fail_mapper_init: |
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154 | mapper_destroy(mapper, false); |
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155 | req.type = KMEM_MAPPER; |
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156 | req.ptr = mapper; |
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157 | kmem_free(&req); |
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158 | |
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159 | fail_mapper: |
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160 | req.type = KMEM_VFAT_CTX; |
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161 | req.ptr = vfat_ctx; |
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162 | kmem_free(&req); |
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163 | |
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164 | rwlock_destroy(&vfat_ctx->lock); |
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165 | return err; |
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166 | } |
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167 | |
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168 | VFS_DESTROY_CONTEXT(vfat_destroy_context) |
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169 | { |
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170 | struct vfat_context_s *ctx; |
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171 | |
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172 | ctx = &context->ctx_vfat; |
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173 | mapper_destroy(ctx->mapper, true); |
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174 | rwlock_destroy(&ctx->lock); |
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175 | return 0; |
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176 | } |
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177 | |
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178 | |
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179 | VFS_READ_ROOT(vfat_read_root) |
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180 | { |
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181 | struct vfat_context_s *ctx; |
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182 | struct vfat_inode_s * i_info; |
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183 | |
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184 | ctx = &context->ctx_vfat; |
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185 | |
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186 | root->i_type |= VFS_DIR;//? |
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187 | root->i_links = 1; |
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188 | root->i_attr |= VFS_DIR; |
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189 | root->i_size = vfat_cluster_count(ctx, ctx->rootdir_first_cluster);//does a dir has a size? |
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190 | root->i_mapper->m_inode = root; |
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191 | root->i_mapper->m_ops = &vfat_inode_mapper_op; |
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192 | root->i_number = vfs_inum_new(context); |
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193 | |
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194 | assert(root->i_pv); |
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195 | i_info = root->i_pv; |
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196 | i_info->flags = VFAT_ATTR_DIRECTORY; |
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197 | i_info->first_cluster = ctx->rootdir_first_cluster; |
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198 | //i_info->parent_cluster = 0; |
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199 | //i_info->entry_index = 0; |
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200 | |
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201 | return 0; |
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202 | } |
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203 | |
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204 | |
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205 | VFS_WRITE_ROOT(vfat_write_root) |
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206 | { |
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207 | return 0; |
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208 | } |
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209 | |
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210 | |
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211 | KMEM_OBJATTR_INIT(vfat_kmem_context_init) |
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212 | { |
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213 | attr->type = KMEM_VFAT_CTX; |
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214 | attr->name = "KCM VFAT CTX"; |
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215 | attr->size = sizeof(struct vfat_context_s); |
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216 | attr->aligne = 0; |
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217 | attr->min = CONFIG_VFAT_CTX_MIN; |
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218 | attr->max = CONFIG_VFAT_CTX_MAX; |
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219 | attr->ctor = NULL; |
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220 | attr->dtor = NULL; |
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221 | return 0; |
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222 | } |
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223 | |
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224 | const struct vfs_context_op_s vfat_ctx_op = |
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225 | { |
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226 | .create = vfat_create_context, |
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227 | .destroy = vfat_destroy_context, |
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228 | .read_root = vfat_read_root, |
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229 | .write_root = vfat_write_root, |
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230 | .repli_root = NULL |
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231 | }; |
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