1 | #include "rtems-jffs2-config.h" |
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2 | |
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3 | /* |
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4 | * JFFS2 -- Journalling Flash File System, Version 2. |
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5 | * |
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6 | * Copyright © 2001-2007 Red Hat, Inc. |
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7 | * |
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8 | * Created by David Woodhouse <dwmw2@infradead.org> |
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9 | * |
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10 | * For licensing information, see the file 'LICENCE' in this directory. |
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11 | * |
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12 | */ |
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13 | |
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14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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15 | |
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16 | #include <linux/kernel.h> |
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17 | #include <linux/sched.h> |
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18 | #include <linux/slab.h> |
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19 | #include <linux/fs.h> |
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20 | #include <linux/crc32.h> |
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21 | #include <linux/pagemap.h> |
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22 | #include <linux/mtd/mtd.h> |
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23 | #include <linux/compiler.h> |
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24 | #include "nodelist.h" |
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25 | |
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26 | /* |
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27 | * Check the data CRC of the node. |
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28 | * |
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29 | * Returns: 0 if the data CRC is correct; |
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30 | * 1 - if incorrect; |
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31 | * error code if an error occurred. |
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32 | */ |
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33 | static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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34 | { |
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35 | struct jffs2_raw_node_ref *ref = tn->fn->raw; |
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36 | #ifndef __rtems__ |
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37 | int err = 0, pointed = 0; |
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38 | #else /* __rtems__ */ |
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39 | int err = 0; |
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40 | #endif /* __rtems__ */ |
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41 | struct jffs2_eraseblock *jeb; |
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42 | unsigned char *buffer; |
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43 | uint32_t crc, ofs, len; |
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44 | size_t retlen; |
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45 | |
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46 | BUG_ON(tn->csize == 0); |
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47 | |
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48 | /* Calculate how many bytes were already checked */ |
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49 | ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); |
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50 | len = tn->csize; |
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51 | |
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52 | if (jffs2_is_writebuffered(c)) { |
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53 | int adj = ofs % c->wbuf_pagesize; |
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54 | if (likely(adj)) |
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55 | adj = c->wbuf_pagesize - adj; |
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56 | |
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57 | if (adj >= tn->csize) { |
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58 | dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n", |
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59 | ref_offset(ref), tn->csize, ofs); |
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60 | goto adj_acc; |
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61 | } |
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62 | |
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63 | ofs += adj; |
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64 | len -= adj; |
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65 | } |
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66 | |
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67 | dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n", |
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68 | ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len); |
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69 | |
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70 | #ifndef __ECOS |
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71 | /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(), |
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72 | * adding and jffs2_flash_read_end() interface. */ |
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73 | err = mtd_point(c->mtd, ofs, len, &retlen, (void **)&buffer, NULL); |
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74 | if (!err && retlen < len) { |
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75 | JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize); |
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76 | mtd_unpoint(c->mtd, ofs, retlen); |
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77 | } else if (err) { |
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78 | if (err != -EOPNOTSUPP) |
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79 | JFFS2_WARNING("MTD point failed: error code %d.\n", err); |
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80 | } else |
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81 | pointed = 1; /* succefully pointed to device */ |
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82 | #endif |
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83 | |
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84 | #ifndef __rtems__ |
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85 | if (!pointed) { |
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86 | #endif /* __rtems__ */ |
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87 | buffer = kmalloc(len, GFP_KERNEL); |
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88 | if (unlikely(!buffer)) |
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89 | return -ENOMEM; |
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90 | |
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91 | /* TODO: this is very frequent pattern, make it a separate |
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92 | * routine */ |
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93 | err = jffs2_flash_read(c, ofs, len, &retlen, buffer); |
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94 | if (err) { |
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95 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err); |
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96 | goto free_out; |
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97 | } |
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98 | |
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99 | if (retlen != len) { |
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100 | JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len); |
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101 | err = -EIO; |
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102 | goto free_out; |
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103 | } |
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104 | #ifndef __rtems__ |
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105 | } |
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106 | #endif /* __rtems__ */ |
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107 | |
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108 | /* Continue calculating CRC */ |
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109 | crc = crc32(tn->partial_crc, buffer, len); |
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110 | #ifndef __rtems__ |
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111 | if(!pointed) |
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112 | #endif /* __rtems__ */ |
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113 | kfree(buffer); |
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114 | #ifndef __ECOS |
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115 | else |
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116 | mtd_unpoint(c->mtd, ofs, len); |
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117 | #endif |
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118 | |
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119 | if (crc != tn->data_crc) { |
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120 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
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121 | ref_offset(ref), tn->data_crc, crc); |
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122 | return 1; |
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123 | } |
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124 | |
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125 | adj_acc: |
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126 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
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127 | len = ref_totlen(c, jeb, ref); |
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128 | /* If it should be REF_NORMAL, it'll get marked as such when |
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129 | we build the fragtree, shortly. No need to worry about GC |
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130 | moving it while it's marked REF_PRISTINE -- GC won't happen |
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131 | till we've finished checking every inode anyway. */ |
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132 | ref->flash_offset |= REF_PRISTINE; |
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133 | /* |
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134 | * Mark the node as having been checked and fix the |
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135 | * accounting accordingly. |
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136 | */ |
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137 | spin_lock(&c->erase_completion_lock); |
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138 | jeb->used_size += len; |
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139 | jeb->unchecked_size -= len; |
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140 | c->used_size += len; |
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141 | c->unchecked_size -= len; |
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142 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
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143 | spin_unlock(&c->erase_completion_lock); |
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144 | |
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145 | return 0; |
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146 | |
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147 | free_out: |
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148 | #ifndef __rtems__ |
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149 | if(!pointed) |
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150 | #endif /* __rtems__ */ |
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151 | kfree(buffer); |
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152 | #ifndef __ECOS |
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153 | else |
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154 | mtd_unpoint(c->mtd, ofs, len); |
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155 | #endif |
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156 | return err; |
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157 | } |
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158 | |
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159 | /* |
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160 | * Helper function for jffs2_add_older_frag_to_fragtree(). |
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161 | * |
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162 | * Checks the node if we are in the checking stage. |
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163 | */ |
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164 | static int check_tn_node(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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165 | { |
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166 | int ret; |
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167 | |
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168 | BUG_ON(ref_obsolete(tn->fn->raw)); |
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169 | |
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170 | /* We only check the data CRC of unchecked nodes */ |
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171 | if (ref_flags(tn->fn->raw) != REF_UNCHECKED) |
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172 | return 0; |
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173 | |
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174 | dbg_readinode("check node %#04x-%#04x, phys offs %#08x\n", |
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175 | tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw)); |
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176 | |
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177 | ret = check_node_data(c, tn); |
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178 | if (unlikely(ret < 0)) { |
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179 | JFFS2_ERROR("check_node_data() returned error: %d.\n", |
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180 | ret); |
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181 | } else if (unlikely(ret > 0)) { |
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182 | dbg_readinode("CRC error, mark it obsolete.\n"); |
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183 | jffs2_mark_node_obsolete(c, tn->fn->raw); |
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184 | } |
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185 | |
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186 | return ret; |
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187 | } |
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188 | |
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189 | static struct jffs2_tmp_dnode_info *jffs2_lookup_tn(struct rb_root *tn_root, uint32_t offset) |
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190 | { |
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191 | struct rb_node *next; |
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192 | struct jffs2_tmp_dnode_info *tn = NULL; |
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193 | |
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194 | dbg_readinode("root %p, offset %d\n", tn_root, offset); |
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195 | |
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196 | next = tn_root->rb_node; |
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197 | |
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198 | while (next) { |
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199 | tn = rb_entry(next, struct jffs2_tmp_dnode_info, rb); |
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200 | |
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201 | if (tn->fn->ofs < offset) |
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202 | next = tn->rb.rb_right; |
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203 | else if (tn->fn->ofs >= offset) |
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204 | next = tn->rb.rb_left; |
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205 | else |
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206 | break; |
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207 | } |
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208 | |
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209 | return tn; |
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210 | } |
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211 | |
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212 | |
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213 | static void jffs2_kill_tn(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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214 | { |
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215 | jffs2_mark_node_obsolete(c, tn->fn->raw); |
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216 | jffs2_free_full_dnode(tn->fn); |
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217 | jffs2_free_tmp_dnode_info(tn); |
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218 | } |
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219 | /* |
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220 | * This function is used when we read an inode. Data nodes arrive in |
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221 | * arbitrary order -- they may be older or newer than the nodes which |
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222 | * are already in the tree. Where overlaps occur, the older node can |
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223 | * be discarded as long as the newer passes the CRC check. We don't |
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224 | * bother to keep track of holes in this rbtree, and neither do we deal |
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225 | * with frags -- we can have multiple entries starting at the same |
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226 | * offset, and the one with the smallest length will come first in the |
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227 | * ordering. |
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228 | * |
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229 | * Returns 0 if the node was handled (including marking it obsolete) |
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230 | * < 0 an if error occurred |
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231 | */ |
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232 | static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c, |
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233 | struct jffs2_readinode_info *rii, |
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234 | struct jffs2_tmp_dnode_info *tn) |
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235 | { |
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236 | uint32_t fn_end = tn->fn->ofs + tn->fn->size; |
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237 | struct jffs2_tmp_dnode_info *this, *ptn; |
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238 | |
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239 | dbg_readinode("insert fragment %#04x-%#04x, ver %u at %08x\n", tn->fn->ofs, fn_end, tn->version, ref_offset(tn->fn->raw)); |
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240 | |
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241 | /* If a node has zero dsize, we only have to keep it if it might be the |
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242 | node with highest version -- i.e. the one which will end up as f->metadata. |
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243 | Note that such nodes won't be REF_UNCHECKED since there are no data to |
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244 | check anyway. */ |
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245 | if (!tn->fn->size) { |
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246 | if (rii->mdata_tn) { |
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247 | if (rii->mdata_tn->version < tn->version) { |
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248 | /* We had a candidate mdata node already */ |
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249 | dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version); |
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250 | jffs2_kill_tn(c, rii->mdata_tn); |
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251 | } else { |
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252 | dbg_readinode("kill new mdata with ver %d (older than existing %d\n", |
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253 | tn->version, rii->mdata_tn->version); |
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254 | jffs2_kill_tn(c, tn); |
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255 | return 0; |
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256 | } |
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257 | } |
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258 | rii->mdata_tn = tn; |
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259 | dbg_readinode("keep new mdata with ver %d\n", tn->version); |
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260 | return 0; |
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261 | } |
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262 | |
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263 | /* Find the earliest node which _may_ be relevant to this one */ |
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264 | this = jffs2_lookup_tn(&rii->tn_root, tn->fn->ofs); |
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265 | if (this) { |
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266 | /* If the node is coincident with another at a lower address, |
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267 | back up until the other node is found. It may be relevant */ |
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268 | while (this->overlapped) { |
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269 | ptn = tn_prev(this); |
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270 | if (!ptn) { |
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271 | /* |
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272 | * We killed a node which set the overlapped |
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273 | * flags during the scan. Fix it up. |
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274 | */ |
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275 | this->overlapped = 0; |
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276 | break; |
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277 | } |
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278 | this = ptn; |
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279 | } |
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280 | dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole"); |
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281 | } |
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282 | |
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283 | while (this) { |
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284 | if (this->fn->ofs > fn_end) |
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285 | break; |
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286 | dbg_readinode("Ponder this ver %d, 0x%x-0x%x\n", |
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287 | this->version, this->fn->ofs, this->fn->size); |
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288 | |
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289 | if (this->version == tn->version) { |
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290 | /* Version number collision means REF_PRISTINE GC. Accept either of them |
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291 | as long as the CRC is correct. Check the one we have already... */ |
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292 | if (!check_tn_node(c, this)) { |
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293 | /* The one we already had was OK. Keep it and throw away the new one */ |
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294 | dbg_readinode("Like old node. Throw away new\n"); |
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295 | jffs2_kill_tn(c, tn); |
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296 | return 0; |
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297 | } else { |
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298 | /* Who cares if the new one is good; keep it for now anyway. */ |
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299 | dbg_readinode("Like new node. Throw away old\n"); |
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300 | rb_replace_node(&this->rb, &tn->rb, &rii->tn_root); |
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301 | jffs2_kill_tn(c, this); |
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302 | /* Same overlapping from in front and behind */ |
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303 | return 0; |
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304 | } |
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305 | } |
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306 | if (this->version < tn->version && |
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307 | this->fn->ofs >= tn->fn->ofs && |
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308 | this->fn->ofs + this->fn->size <= fn_end) { |
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309 | /* New node entirely overlaps 'this' */ |
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310 | if (check_tn_node(c, tn)) { |
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311 | dbg_readinode("new node bad CRC\n"); |
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312 | jffs2_kill_tn(c, tn); |
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313 | return 0; |
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314 | } |
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315 | /* ... and is good. Kill 'this' and any subsequent nodes which are also overlapped */ |
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316 | while (this && this->fn->ofs + this->fn->size <= fn_end) { |
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317 | struct jffs2_tmp_dnode_info *next = tn_next(this); |
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318 | if (this->version < tn->version) { |
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319 | tn_erase(this, &rii->tn_root); |
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320 | dbg_readinode("Kill overlapped ver %d, 0x%x-0x%x\n", |
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321 | this->version, this->fn->ofs, |
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322 | this->fn->ofs+this->fn->size); |
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323 | jffs2_kill_tn(c, this); |
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324 | } |
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325 | this = next; |
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326 | } |
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327 | dbg_readinode("Done killing overlapped nodes\n"); |
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328 | continue; |
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329 | } |
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330 | if (this->version > tn->version && |
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331 | this->fn->ofs <= tn->fn->ofs && |
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332 | this->fn->ofs+this->fn->size >= fn_end) { |
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333 | /* New node entirely overlapped by 'this' */ |
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334 | if (!check_tn_node(c, this)) { |
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335 | dbg_readinode("Good CRC on old node. Kill new\n"); |
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336 | jffs2_kill_tn(c, tn); |
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337 | return 0; |
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338 | } |
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339 | /* ... but 'this' was bad. Replace it... */ |
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340 | dbg_readinode("Bad CRC on old overlapping node. Kill it\n"); |
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341 | tn_erase(this, &rii->tn_root); |
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342 | jffs2_kill_tn(c, this); |
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343 | break; |
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344 | } |
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345 | |
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346 | this = tn_next(this); |
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347 | } |
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348 | |
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349 | /* We neither completely obsoleted nor were completely |
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350 | obsoleted by an earlier node. Insert into the tree */ |
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351 | { |
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352 | struct rb_node *parent; |
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353 | struct rb_node **link = &rii->tn_root.rb_node; |
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354 | struct jffs2_tmp_dnode_info *insert_point = NULL; |
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355 | |
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356 | while (*link) { |
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357 | parent = *link; |
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358 | insert_point = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
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359 | if (tn->fn->ofs > insert_point->fn->ofs) |
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360 | link = &insert_point->rb.rb_right; |
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361 | else if (tn->fn->ofs < insert_point->fn->ofs || |
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362 | tn->fn->size < insert_point->fn->size) |
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363 | link = &insert_point->rb.rb_left; |
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364 | else |
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365 | link = &insert_point->rb.rb_right; |
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366 | } |
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367 | rb_link_node(&tn->rb, &insert_point->rb, link); |
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368 | rb_insert_color(&tn->rb, &rii->tn_root); |
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369 | } |
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370 | |
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371 | /* If there's anything behind that overlaps us, note it */ |
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372 | this = tn_prev(tn); |
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373 | if (this) { |
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374 | while (1) { |
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375 | if (this->fn->ofs + this->fn->size > tn->fn->ofs) { |
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376 | dbg_readinode("Node is overlapped by %p (v %d, 0x%x-0x%x)\n", |
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377 | this, this->version, this->fn->ofs, |
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378 | this->fn->ofs+this->fn->size); |
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379 | tn->overlapped = 1; |
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380 | break; |
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381 | } |
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382 | if (!this->overlapped) |
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383 | break; |
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384 | |
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385 | ptn = tn_prev(this); |
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386 | if (!ptn) { |
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387 | /* |
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388 | * We killed a node which set the overlapped |
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389 | * flags during the scan. Fix it up. |
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390 | */ |
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391 | this->overlapped = 0; |
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392 | break; |
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393 | } |
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394 | this = ptn; |
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395 | } |
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396 | } |
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397 | |
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398 | /* If the new node overlaps anything ahead, note it */ |
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399 | this = tn_next(tn); |
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400 | while (this && this->fn->ofs < fn_end) { |
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401 | this->overlapped = 1; |
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402 | dbg_readinode("Node ver %d, 0x%x-0x%x is overlapped\n", |
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403 | this->version, this->fn->ofs, |
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404 | this->fn->ofs+this->fn->size); |
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405 | this = tn_next(this); |
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406 | } |
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407 | return 0; |
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408 | } |
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409 | |
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410 | /* Trivial function to remove the last node in the tree. Which by definition |
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411 | has no right-hand child â so can be removed just by making its left-hand |
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412 | child (if any) take its place under its parent. Since this is only done |
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413 | when we're consuming the whole tree, there's no need to use rb_erase() |
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414 | and let it worry about adjusting colours and balancing the tree. That |
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415 | would just be a waste of time. */ |
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416 | static void eat_last(struct rb_root *root, struct rb_node *node) |
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417 | { |
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418 | struct rb_node *parent = rb_parent(node); |
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419 | struct rb_node **link; |
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420 | |
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421 | /* LAST! */ |
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422 | BUG_ON(node->rb_right); |
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423 | |
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424 | if (!parent) |
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425 | link = &root->rb_node; |
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426 | else if (node == parent->rb_left) |
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427 | link = &parent->rb_left; |
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428 | else |
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429 | link = &parent->rb_right; |
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430 | |
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431 | *link = node->rb_left; |
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432 | if (node->rb_left) |
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433 | #ifndef __rtems__ |
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434 | node->rb_left->__rb_parent_color = node->__rb_parent_color; |
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435 | #else /* __rtems__ */ |
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436 | { |
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437 | node->rb_left->Node.rbe_parent = node->Node.rbe_parent; |
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438 | node->rb_left->Node.rbe_color = node->Node.rbe_color; |
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439 | } |
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440 | #endif /* __rtems__ */ |
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441 | } |
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442 | |
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443 | /* We put the version tree in reverse order, so we can use the same eat_last() |
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444 | function that we use to consume the tmpnode tree (tn_root). */ |
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445 | static void ver_insert(struct rb_root *ver_root, struct jffs2_tmp_dnode_info *tn) |
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446 | { |
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447 | struct rb_node **link = &ver_root->rb_node; |
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448 | struct rb_node *parent = NULL; |
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449 | struct jffs2_tmp_dnode_info *this_tn; |
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450 | |
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451 | while (*link) { |
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452 | parent = *link; |
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453 | this_tn = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
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454 | |
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455 | if (tn->version > this_tn->version) |
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456 | link = &parent->rb_left; |
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457 | else |
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458 | link = &parent->rb_right; |
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459 | } |
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460 | dbg_readinode("Link new node at %p (root is %p)\n", link, ver_root); |
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461 | rb_link_node(&tn->rb, parent, link); |
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462 | rb_insert_color(&tn->rb, ver_root); |
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463 | } |
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464 | |
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465 | /* Build final, normal fragtree from tn tree. It doesn't matter which order |
---|
466 | we add nodes to the real fragtree, as long as they don't overlap. And |
---|
467 | having thrown away the majority of overlapped nodes as we went, there |
---|
468 | really shouldn't be many sets of nodes which do overlap. If we start at |
---|
469 | the end, we can use the overlap markers -- we can just eat nodes which |
---|
470 | aren't overlapped, and when we encounter nodes which _do_ overlap we |
---|
471 | sort them all into a temporary tree in version order before replaying them. */ |
---|
472 | static int jffs2_build_inode_fragtree(struct jffs2_sb_info *c, |
---|
473 | struct jffs2_inode_info *f, |
---|
474 | struct jffs2_readinode_info *rii) |
---|
475 | { |
---|
476 | struct jffs2_tmp_dnode_info *pen, *last, *this; |
---|
477 | struct rb_root ver_root = RB_ROOT; |
---|
478 | uint32_t high_ver = 0; |
---|
479 | |
---|
480 | if (rii->mdata_tn) { |
---|
481 | dbg_readinode("potential mdata is ver %d at %p\n", rii->mdata_tn->version, rii->mdata_tn); |
---|
482 | high_ver = rii->mdata_tn->version; |
---|
483 | rii->latest_ref = rii->mdata_tn->fn->raw; |
---|
484 | } |
---|
485 | #ifdef JFFS2_DBG_READINODE_MESSAGES |
---|
486 | this = tn_last(&rii->tn_root); |
---|
487 | while (this) { |
---|
488 | dbg_readinode("tn %p ver %d range 0x%x-0x%x ov %d\n", this, this->version, this->fn->ofs, |
---|
489 | this->fn->ofs+this->fn->size, this->overlapped); |
---|
490 | this = tn_prev(this); |
---|
491 | } |
---|
492 | #endif |
---|
493 | pen = tn_last(&rii->tn_root); |
---|
494 | while ((last = pen)) { |
---|
495 | pen = tn_prev(last); |
---|
496 | |
---|
497 | eat_last(&rii->tn_root, &last->rb); |
---|
498 | ver_insert(&ver_root, last); |
---|
499 | |
---|
500 | if (unlikely(last->overlapped)) { |
---|
501 | if (pen) |
---|
502 | continue; |
---|
503 | /* |
---|
504 | * We killed a node which set the overlapped |
---|
505 | * flags during the scan. Fix it up. |
---|
506 | */ |
---|
507 | last->overlapped = 0; |
---|
508 | } |
---|
509 | |
---|
510 | /* Now we have a bunch of nodes in reverse version |
---|
511 | order, in the tree at ver_root. Most of the time, |
---|
512 | there'll actually be only one node in the 'tree', |
---|
513 | in fact. */ |
---|
514 | this = tn_last(&ver_root); |
---|
515 | |
---|
516 | while (this) { |
---|
517 | struct jffs2_tmp_dnode_info *vers_next; |
---|
518 | int ret; |
---|
519 | vers_next = tn_prev(this); |
---|
520 | eat_last(&ver_root, &this->rb); |
---|
521 | if (check_tn_node(c, this)) { |
---|
522 | dbg_readinode("node ver %d, 0x%x-0x%x failed CRC\n", |
---|
523 | this->version, this->fn->ofs, |
---|
524 | this->fn->ofs+this->fn->size); |
---|
525 | jffs2_kill_tn(c, this); |
---|
526 | } else { |
---|
527 | if (this->version > high_ver) { |
---|
528 | /* Note that this is different from the other |
---|
529 | highest_version, because this one is only |
---|
530 | counting _valid_ nodes which could give the |
---|
531 | latest inode metadata */ |
---|
532 | high_ver = this->version; |
---|
533 | rii->latest_ref = this->fn->raw; |
---|
534 | } |
---|
535 | dbg_readinode("Add %p (v %d, 0x%x-0x%x, ov %d) to fragtree\n", |
---|
536 | this, this->version, this->fn->ofs, |
---|
537 | this->fn->ofs+this->fn->size, this->overlapped); |
---|
538 | |
---|
539 | ret = jffs2_add_full_dnode_to_inode(c, f, this->fn); |
---|
540 | if (ret) { |
---|
541 | /* Free the nodes in vers_root; let the caller |
---|
542 | deal with the rest */ |
---|
543 | JFFS2_ERROR("Add node to tree failed %d\n", ret); |
---|
544 | while (1) { |
---|
545 | vers_next = tn_prev(this); |
---|
546 | if (check_tn_node(c, this)) |
---|
547 | jffs2_mark_node_obsolete(c, this->fn->raw); |
---|
548 | jffs2_free_full_dnode(this->fn); |
---|
549 | jffs2_free_tmp_dnode_info(this); |
---|
550 | this = vers_next; |
---|
551 | if (!this) |
---|
552 | break; |
---|
553 | eat_last(&ver_root, &vers_next->rb); |
---|
554 | } |
---|
555 | return ret; |
---|
556 | } |
---|
557 | jffs2_free_tmp_dnode_info(this); |
---|
558 | } |
---|
559 | this = vers_next; |
---|
560 | } |
---|
561 | } |
---|
562 | return 0; |
---|
563 | } |
---|
564 | |
---|
565 | static void jffs2_free_tmp_dnode_info_list(struct rb_root *list) |
---|
566 | { |
---|
567 | struct jffs2_tmp_dnode_info *tn, *next; |
---|
568 | |
---|
569 | rbtree_postorder_for_each_entry_safe(tn, next, list, rb) { |
---|
570 | jffs2_free_full_dnode(tn->fn); |
---|
571 | jffs2_free_tmp_dnode_info(tn); |
---|
572 | } |
---|
573 | |
---|
574 | *list = RB_ROOT; |
---|
575 | } |
---|
576 | |
---|
577 | static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) |
---|
578 | { |
---|
579 | struct jffs2_full_dirent *next; |
---|
580 | |
---|
581 | while (fd) { |
---|
582 | next = fd->next; |
---|
583 | jffs2_free_full_dirent(fd); |
---|
584 | fd = next; |
---|
585 | } |
---|
586 | } |
---|
587 | |
---|
588 | /* Returns first valid node after 'ref'. May return 'ref' */ |
---|
589 | static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref) |
---|
590 | { |
---|
591 | while (ref && ref->next_in_ino) { |
---|
592 | if (!ref_obsolete(ref)) |
---|
593 | return ref; |
---|
594 | dbg_noderef("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)); |
---|
595 | ref = ref->next_in_ino; |
---|
596 | } |
---|
597 | return NULL; |
---|
598 | } |
---|
599 | |
---|
600 | /* |
---|
601 | * Helper function for jffs2_get_inode_nodes(). |
---|
602 | * It is called every time an directory entry node is found. |
---|
603 | * |
---|
604 | * Returns: 0 on success; |
---|
605 | * negative error code on failure. |
---|
606 | */ |
---|
607 | static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
608 | struct jffs2_raw_dirent *rd, size_t read, |
---|
609 | struct jffs2_readinode_info *rii) |
---|
610 | { |
---|
611 | struct jffs2_full_dirent *fd; |
---|
612 | uint32_t crc; |
---|
613 | |
---|
614 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
---|
615 | BUG_ON(ref_obsolete(ref)); |
---|
616 | |
---|
617 | crc = crc32(0, rd, sizeof(*rd) - 8); |
---|
618 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
---|
619 | JFFS2_NOTICE("header CRC failed on dirent node at %#08x: read %#08x, calculated %#08x\n", |
---|
620 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
---|
621 | jffs2_mark_node_obsolete(c, ref); |
---|
622 | return 0; |
---|
623 | } |
---|
624 | |
---|
625 | /* If we've never checked the CRCs on this node, check them now */ |
---|
626 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
627 | struct jffs2_eraseblock *jeb; |
---|
628 | int len; |
---|
629 | |
---|
630 | /* Sanity check */ |
---|
631 | if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) { |
---|
632 | JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n", |
---|
633 | ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen)); |
---|
634 | jffs2_mark_node_obsolete(c, ref); |
---|
635 | return 0; |
---|
636 | } |
---|
637 | |
---|
638 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
639 | len = ref_totlen(c, jeb, ref); |
---|
640 | |
---|
641 | spin_lock(&c->erase_completion_lock); |
---|
642 | jeb->used_size += len; |
---|
643 | jeb->unchecked_size -= len; |
---|
644 | c->used_size += len; |
---|
645 | c->unchecked_size -= len; |
---|
646 | ref->flash_offset = ref_offset(ref) | dirent_node_state(rd); |
---|
647 | spin_unlock(&c->erase_completion_lock); |
---|
648 | } |
---|
649 | |
---|
650 | fd = jffs2_alloc_full_dirent(rd->nsize + 1); |
---|
651 | if (unlikely(!fd)) |
---|
652 | return -ENOMEM; |
---|
653 | |
---|
654 | fd->raw = ref; |
---|
655 | fd->version = je32_to_cpu(rd->version); |
---|
656 | fd->ino = je32_to_cpu(rd->ino); |
---|
657 | fd->type = rd->type; |
---|
658 | |
---|
659 | if (fd->version > rii->highest_version) |
---|
660 | rii->highest_version = fd->version; |
---|
661 | |
---|
662 | /* Pick out the mctime of the latest dirent */ |
---|
663 | if(fd->version > rii->mctime_ver && je32_to_cpu(rd->mctime)) { |
---|
664 | rii->mctime_ver = fd->version; |
---|
665 | rii->latest_mctime = je32_to_cpu(rd->mctime); |
---|
666 | } |
---|
667 | |
---|
668 | /* |
---|
669 | * Copy as much of the name as possible from the raw |
---|
670 | * dirent we've already read from the flash. |
---|
671 | */ |
---|
672 | if (read > sizeof(*rd)) |
---|
673 | memcpy(&fd->name[0], &rd->name[0], |
---|
674 | min_t(uint32_t, rd->nsize, (read - sizeof(*rd)) )); |
---|
675 | |
---|
676 | /* Do we need to copy any more of the name directly from the flash? */ |
---|
677 | if (rd->nsize + sizeof(*rd) > read) { |
---|
678 | /* FIXME: point() */ |
---|
679 | int err; |
---|
680 | int already = read - sizeof(*rd); |
---|
681 | |
---|
682 | err = jffs2_flash_read(c, (ref_offset(ref)) + read, |
---|
683 | rd->nsize - already, &read, &fd->name[already]); |
---|
684 | if (unlikely(read != rd->nsize - already) && likely(!err)) { |
---|
685 | jffs2_free_full_dirent(fd); |
---|
686 | JFFS2_ERROR("short read: wanted %d bytes, got %zd\n", |
---|
687 | rd->nsize - already, read); |
---|
688 | return -EIO; |
---|
689 | } |
---|
690 | |
---|
691 | if (unlikely(err)) { |
---|
692 | JFFS2_ERROR("read remainder of name: error %d\n", err); |
---|
693 | jffs2_free_full_dirent(fd); |
---|
694 | return -EIO; |
---|
695 | } |
---|
696 | } |
---|
697 | |
---|
698 | fd->nhash = full_name_hash(NULL, fd->name, rd->nsize); |
---|
699 | fd->next = NULL; |
---|
700 | fd->name[rd->nsize] = '\0'; |
---|
701 | |
---|
702 | /* |
---|
703 | * Wheee. We now have a complete jffs2_full_dirent structure, with |
---|
704 | * the name in it and everything. Link it into the list |
---|
705 | */ |
---|
706 | jffs2_add_fd_to_list(c, fd, &rii->fds); |
---|
707 | |
---|
708 | return 0; |
---|
709 | } |
---|
710 | |
---|
711 | /* |
---|
712 | * Helper function for jffs2_get_inode_nodes(). |
---|
713 | * It is called every time an inode node is found. |
---|
714 | * |
---|
715 | * Returns: 0 on success (possibly after marking a bad node obsolete); |
---|
716 | * negative error code on failure. |
---|
717 | */ |
---|
718 | static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
719 | struct jffs2_raw_inode *rd, int rdlen, |
---|
720 | struct jffs2_readinode_info *rii) |
---|
721 | { |
---|
722 | struct jffs2_tmp_dnode_info *tn; |
---|
723 | uint32_t len, csize; |
---|
724 | int ret = 0; |
---|
725 | uint32_t crc; |
---|
726 | |
---|
727 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
---|
728 | BUG_ON(ref_obsolete(ref)); |
---|
729 | |
---|
730 | crc = crc32(0, rd, sizeof(*rd) - 8); |
---|
731 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
---|
732 | JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n", |
---|
733 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
---|
734 | jffs2_mark_node_obsolete(c, ref); |
---|
735 | return 0; |
---|
736 | } |
---|
737 | |
---|
738 | tn = jffs2_alloc_tmp_dnode_info(); |
---|
739 | if (!tn) { |
---|
740 | JFFS2_ERROR("failed to allocate tn (%zu bytes).\n", sizeof(*tn)); |
---|
741 | return -ENOMEM; |
---|
742 | } |
---|
743 | |
---|
744 | tn->partial_crc = 0; |
---|
745 | csize = je32_to_cpu(rd->csize); |
---|
746 | |
---|
747 | /* If we've never checked the CRCs on this node, check them now */ |
---|
748 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
749 | |
---|
750 | /* Sanity checks */ |
---|
751 | if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) || |
---|
752 | unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) { |
---|
753 | JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref)); |
---|
754 | jffs2_dbg_dump_node(c, ref_offset(ref)); |
---|
755 | jffs2_mark_node_obsolete(c, ref); |
---|
756 | goto free_out; |
---|
757 | } |
---|
758 | |
---|
759 | if (jffs2_is_writebuffered(c) && csize != 0) { |
---|
760 | /* At this point we are supposed to check the data CRC |
---|
761 | * of our unchecked node. But thus far, we do not |
---|
762 | * know whether the node is valid or obsolete. To |
---|
763 | * figure this out, we need to walk all the nodes of |
---|
764 | * the inode and build the inode fragtree. We don't |
---|
765 | * want to spend time checking data of nodes which may |
---|
766 | * later be found to be obsolete. So we put off the full |
---|
767 | * data CRC checking until we have read all the inode |
---|
768 | * nodes and have started building the fragtree. |
---|
769 | * |
---|
770 | * The fragtree is being built starting with nodes |
---|
771 | * having the highest version number, so we'll be able |
---|
772 | * to detect whether a node is valid (i.e., it is not |
---|
773 | * overlapped by a node with higher version) or not. |
---|
774 | * And we'll be able to check only those nodes, which |
---|
775 | * are not obsolete. |
---|
776 | * |
---|
777 | * Of course, this optimization only makes sense in case |
---|
778 | * of NAND flashes (or other flashes with |
---|
779 | * !jffs2_can_mark_obsolete()), since on NOR flashes |
---|
780 | * nodes are marked obsolete physically. |
---|
781 | * |
---|
782 | * Since NAND flashes (or other flashes with |
---|
783 | * jffs2_is_writebuffered(c)) are anyway read by |
---|
784 | * fractions of c->wbuf_pagesize, and we have just read |
---|
785 | * the node header, it is likely that the starting part |
---|
786 | * of the node data is also read when we read the |
---|
787 | * header. So we don't mind to check the CRC of the |
---|
788 | * starting part of the data of the node now, and check |
---|
789 | * the second part later (in jffs2_check_node_data()). |
---|
790 | * Of course, we will not need to re-read and re-check |
---|
791 | * the NAND page which we have just read. This is why we |
---|
792 | * read the whole NAND page at jffs2_get_inode_nodes(), |
---|
793 | * while we needed only the node header. |
---|
794 | */ |
---|
795 | unsigned char *buf; |
---|
796 | |
---|
797 | /* 'buf' will point to the start of data */ |
---|
798 | buf = (unsigned char *)rd + sizeof(*rd); |
---|
799 | /* len will be the read data length */ |
---|
800 | len = min_t(uint32_t, rdlen - sizeof(*rd), csize); |
---|
801 | tn->partial_crc = crc32(0, buf, len); |
---|
802 | |
---|
803 | dbg_readinode("Calculates CRC (%#08x) for %d bytes, csize %d\n", tn->partial_crc, len, csize); |
---|
804 | |
---|
805 | /* If we actually calculated the whole data CRC |
---|
806 | * and it is wrong, drop the node. */ |
---|
807 | if (len >= csize && unlikely(tn->partial_crc != je32_to_cpu(rd->data_crc))) { |
---|
808 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
---|
809 | ref_offset(ref), tn->partial_crc, je32_to_cpu(rd->data_crc)); |
---|
810 | jffs2_mark_node_obsolete(c, ref); |
---|
811 | goto free_out; |
---|
812 | } |
---|
813 | |
---|
814 | } else if (csize == 0) { |
---|
815 | /* |
---|
816 | * We checked the header CRC. If the node has no data, adjust |
---|
817 | * the space accounting now. For other nodes this will be done |
---|
818 | * later either when the node is marked obsolete or when its |
---|
819 | * data is checked. |
---|
820 | */ |
---|
821 | struct jffs2_eraseblock *jeb; |
---|
822 | |
---|
823 | dbg_readinode("the node has no data.\n"); |
---|
824 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
825 | len = ref_totlen(c, jeb, ref); |
---|
826 | |
---|
827 | spin_lock(&c->erase_completion_lock); |
---|
828 | jeb->used_size += len; |
---|
829 | jeb->unchecked_size -= len; |
---|
830 | c->used_size += len; |
---|
831 | c->unchecked_size -= len; |
---|
832 | ref->flash_offset = ref_offset(ref) | REF_NORMAL; |
---|
833 | spin_unlock(&c->erase_completion_lock); |
---|
834 | } |
---|
835 | } |
---|
836 | |
---|
837 | tn->fn = jffs2_alloc_full_dnode(); |
---|
838 | if (!tn->fn) { |
---|
839 | JFFS2_ERROR("alloc fn failed\n"); |
---|
840 | ret = -ENOMEM; |
---|
841 | goto free_out; |
---|
842 | } |
---|
843 | |
---|
844 | tn->version = je32_to_cpu(rd->version); |
---|
845 | tn->fn->ofs = je32_to_cpu(rd->offset); |
---|
846 | tn->data_crc = je32_to_cpu(rd->data_crc); |
---|
847 | tn->csize = csize; |
---|
848 | tn->fn->raw = ref; |
---|
849 | tn->overlapped = 0; |
---|
850 | |
---|
851 | if (tn->version > rii->highest_version) |
---|
852 | rii->highest_version = tn->version; |
---|
853 | |
---|
854 | /* There was a bug where we wrote hole nodes out with |
---|
855 | csize/dsize swapped. Deal with it */ |
---|
856 | if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && csize) |
---|
857 | tn->fn->size = csize; |
---|
858 | else // normal case... |
---|
859 | tn->fn->size = je32_to_cpu(rd->dsize); |
---|
860 | |
---|
861 | dbg_readinode2("dnode @%08x: ver %u, offset %#04x, dsize %#04x, csize %#04x\n", |
---|
862 | ref_offset(ref), je32_to_cpu(rd->version), |
---|
863 | je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize), csize); |
---|
864 | |
---|
865 | ret = jffs2_add_tn_to_tree(c, rii, tn); |
---|
866 | |
---|
867 | if (ret) { |
---|
868 | jffs2_free_full_dnode(tn->fn); |
---|
869 | free_out: |
---|
870 | jffs2_free_tmp_dnode_info(tn); |
---|
871 | return ret; |
---|
872 | } |
---|
873 | #ifdef JFFS2_DBG_READINODE2_MESSAGES |
---|
874 | dbg_readinode2("After adding ver %d:\n", je32_to_cpu(rd->version)); |
---|
875 | tn = tn_first(&rii->tn_root); |
---|
876 | while (tn) { |
---|
877 | dbg_readinode2("%p: v %d r 0x%x-0x%x ov %d\n", |
---|
878 | tn, tn->version, tn->fn->ofs, |
---|
879 | tn->fn->ofs+tn->fn->size, tn->overlapped); |
---|
880 | tn = tn_next(tn); |
---|
881 | } |
---|
882 | #endif |
---|
883 | return 0; |
---|
884 | } |
---|
885 | |
---|
886 | /* |
---|
887 | * Helper function for jffs2_get_inode_nodes(). |
---|
888 | * It is called every time an unknown node is found. |
---|
889 | * |
---|
890 | * Returns: 0 on success; |
---|
891 | * negative error code on failure. |
---|
892 | */ |
---|
893 | static inline int read_unknown(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, struct jffs2_unknown_node *un) |
---|
894 | { |
---|
895 | /* We don't mark unknown nodes as REF_UNCHECKED */ |
---|
896 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
897 | JFFS2_ERROR("REF_UNCHECKED but unknown node at %#08x\n", |
---|
898 | ref_offset(ref)); |
---|
899 | JFFS2_ERROR("Node is {%04x,%04x,%08x,%08x}. Please report this error.\n", |
---|
900 | je16_to_cpu(un->magic), je16_to_cpu(un->nodetype), |
---|
901 | je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc)); |
---|
902 | jffs2_mark_node_obsolete(c, ref); |
---|
903 | return 0; |
---|
904 | } |
---|
905 | |
---|
906 | un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype)); |
---|
907 | |
---|
908 | switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) { |
---|
909 | |
---|
910 | case JFFS2_FEATURE_INCOMPAT: |
---|
911 | JFFS2_ERROR("unknown INCOMPAT nodetype %#04X at %#08x\n", |
---|
912 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
913 | /* EEP */ |
---|
914 | BUG(); |
---|
915 | break; |
---|
916 | |
---|
917 | case JFFS2_FEATURE_ROCOMPAT: |
---|
918 | JFFS2_ERROR("unknown ROCOMPAT nodetype %#04X at %#08x\n", |
---|
919 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
920 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_RO)); |
---|
921 | break; |
---|
922 | |
---|
923 | case JFFS2_FEATURE_RWCOMPAT_COPY: |
---|
924 | JFFS2_NOTICE("unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n", |
---|
925 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
926 | break; |
---|
927 | |
---|
928 | case JFFS2_FEATURE_RWCOMPAT_DELETE: |
---|
929 | JFFS2_NOTICE("unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n", |
---|
930 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
931 | jffs2_mark_node_obsolete(c, ref); |
---|
932 | return 0; |
---|
933 | } |
---|
934 | |
---|
935 | return 0; |
---|
936 | } |
---|
937 | |
---|
938 | /* |
---|
939 | * Helper function for jffs2_get_inode_nodes(). |
---|
940 | * The function detects whether more data should be read and reads it if yes. |
---|
941 | * |
---|
942 | * Returns: 0 on success; |
---|
943 | * negative error code on failure. |
---|
944 | */ |
---|
945 | static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
946 | int needed_len, int *rdlen, unsigned char *buf) |
---|
947 | { |
---|
948 | int err, to_read = needed_len - *rdlen; |
---|
949 | size_t retlen; |
---|
950 | uint32_t offs; |
---|
951 | |
---|
952 | if (jffs2_is_writebuffered(c)) { |
---|
953 | int rem = to_read % c->wbuf_pagesize; |
---|
954 | |
---|
955 | if (rem) |
---|
956 | to_read += c->wbuf_pagesize - rem; |
---|
957 | } |
---|
958 | |
---|
959 | /* We need to read more data */ |
---|
960 | offs = ref_offset(ref) + *rdlen; |
---|
961 | |
---|
962 | dbg_readinode("read more %d bytes\n", to_read); |
---|
963 | |
---|
964 | err = jffs2_flash_read(c, offs, to_read, &retlen, buf + *rdlen); |
---|
965 | if (err) { |
---|
966 | JFFS2_ERROR("can not read %d bytes from 0x%08x, " |
---|
967 | "error code: %d.\n", to_read, offs, err); |
---|
968 | return err; |
---|
969 | } |
---|
970 | |
---|
971 | if (retlen < to_read) { |
---|
972 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", |
---|
973 | offs, retlen, to_read); |
---|
974 | return -EIO; |
---|
975 | } |
---|
976 | |
---|
977 | *rdlen += to_read; |
---|
978 | return 0; |
---|
979 | } |
---|
980 | |
---|
981 | /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated |
---|
982 | with this ino. Perform a preliminary ordering on data nodes, throwing away |
---|
983 | those which are completely obsoleted by newer ones. The naïve approach we |
---|
984 | use to take of just returning them _all_ in version order will cause us to |
---|
985 | run out of memory in certain degenerate cases. */ |
---|
986 | static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
---|
987 | struct jffs2_readinode_info *rii) |
---|
988 | { |
---|
989 | struct jffs2_raw_node_ref *ref, *valid_ref; |
---|
990 | unsigned char *buf = NULL; |
---|
991 | union jffs2_node_union *node; |
---|
992 | size_t retlen; |
---|
993 | int len, err; |
---|
994 | |
---|
995 | rii->mctime_ver = 0; |
---|
996 | |
---|
997 | dbg_readinode("ino #%u\n", f->inocache->ino); |
---|
998 | |
---|
999 | /* FIXME: in case of NOR and available ->point() this |
---|
1000 | * needs to be fixed. */ |
---|
1001 | len = sizeof(union jffs2_node_union) + c->wbuf_pagesize; |
---|
1002 | buf = kmalloc(len, GFP_KERNEL); |
---|
1003 | if (!buf) |
---|
1004 | return -ENOMEM; |
---|
1005 | |
---|
1006 | spin_lock(&c->erase_completion_lock); |
---|
1007 | valid_ref = jffs2_first_valid_node(f->inocache->nodes); |
---|
1008 | if (!valid_ref && f->inocache->ino != 1) |
---|
1009 | JFFS2_WARNING("Eep. No valid nodes for ino #%u.\n", f->inocache->ino); |
---|
1010 | while (valid_ref) { |
---|
1011 | /* We can hold a pointer to a non-obsolete node without the spinlock, |
---|
1012 | but _obsolete_ nodes may disappear at any time, if the block |
---|
1013 | they're in gets erased. So if we mark 'ref' obsolete while we're |
---|
1014 | not holding the lock, it can go away immediately. For that reason, |
---|
1015 | we find the next valid node first, before processing 'ref'. |
---|
1016 | */ |
---|
1017 | ref = valid_ref; |
---|
1018 | valid_ref = jffs2_first_valid_node(ref->next_in_ino); |
---|
1019 | spin_unlock(&c->erase_completion_lock); |
---|
1020 | |
---|
1021 | cond_resched(); |
---|
1022 | |
---|
1023 | /* |
---|
1024 | * At this point we don't know the type of the node we're going |
---|
1025 | * to read, so we do not know the size of its header. In order |
---|
1026 | * to minimize the amount of flash IO we assume the header is |
---|
1027 | * of size = JFFS2_MIN_NODE_HEADER. |
---|
1028 | */ |
---|
1029 | len = JFFS2_MIN_NODE_HEADER; |
---|
1030 | if (jffs2_is_writebuffered(c)) { |
---|
1031 | int end, rem; |
---|
1032 | |
---|
1033 | /* |
---|
1034 | * We are about to read JFFS2_MIN_NODE_HEADER bytes, |
---|
1035 | * but this flash has some minimal I/O unit. It is |
---|
1036 | * possible that we'll need to read more soon, so read |
---|
1037 | * up to the next min. I/O unit, in order not to |
---|
1038 | * re-read the same min. I/O unit twice. |
---|
1039 | */ |
---|
1040 | end = ref_offset(ref) + len; |
---|
1041 | rem = end % c->wbuf_pagesize; |
---|
1042 | if (rem) |
---|
1043 | end += c->wbuf_pagesize - rem; |
---|
1044 | len = end - ref_offset(ref); |
---|
1045 | } |
---|
1046 | |
---|
1047 | dbg_readinode("read %d bytes at %#08x(%d).\n", len, ref_offset(ref), ref_flags(ref)); |
---|
1048 | |
---|
1049 | /* FIXME: point() */ |
---|
1050 | err = jffs2_flash_read(c, ref_offset(ref), len, &retlen, buf); |
---|
1051 | if (err) { |
---|
1052 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ref_offset(ref), err); |
---|
1053 | goto free_out; |
---|
1054 | } |
---|
1055 | |
---|
1056 | if (retlen < len) { |
---|
1057 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", ref_offset(ref), retlen, len); |
---|
1058 | err = -EIO; |
---|
1059 | goto free_out; |
---|
1060 | } |
---|
1061 | |
---|
1062 | node = (union jffs2_node_union *)buf; |
---|
1063 | |
---|
1064 | /* No need to mask in the valid bit; it shouldn't be invalid */ |
---|
1065 | if (je32_to_cpu(node->u.hdr_crc) != crc32(0, node, sizeof(node->u)-4)) { |
---|
1066 | JFFS2_NOTICE("Node header CRC failed at %#08x. {%04x,%04x,%08x,%08x}\n", |
---|
1067 | ref_offset(ref), je16_to_cpu(node->u.magic), |
---|
1068 | je16_to_cpu(node->u.nodetype), |
---|
1069 | je32_to_cpu(node->u.totlen), |
---|
1070 | je32_to_cpu(node->u.hdr_crc)); |
---|
1071 | jffs2_dbg_dump_node(c, ref_offset(ref)); |
---|
1072 | jffs2_mark_node_obsolete(c, ref); |
---|
1073 | goto cont; |
---|
1074 | } |
---|
1075 | if (je16_to_cpu(node->u.magic) != JFFS2_MAGIC_BITMASK) { |
---|
1076 | /* Not a JFFS2 node, whinge and move on */ |
---|
1077 | JFFS2_NOTICE("Wrong magic bitmask 0x%04x in node header at %#08x.\n", |
---|
1078 | je16_to_cpu(node->u.magic), ref_offset(ref)); |
---|
1079 | jffs2_mark_node_obsolete(c, ref); |
---|
1080 | goto cont; |
---|
1081 | } |
---|
1082 | |
---|
1083 | switch (je16_to_cpu(node->u.nodetype)) { |
---|
1084 | |
---|
1085 | case JFFS2_NODETYPE_DIRENT: |
---|
1086 | |
---|
1087 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent) && |
---|
1088 | len < sizeof(struct jffs2_raw_dirent)) { |
---|
1089 | err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf); |
---|
1090 | if (unlikely(err)) |
---|
1091 | goto free_out; |
---|
1092 | } |
---|
1093 | |
---|
1094 | err = read_direntry(c, ref, &node->d, retlen, rii); |
---|
1095 | if (unlikely(err)) |
---|
1096 | goto free_out; |
---|
1097 | |
---|
1098 | break; |
---|
1099 | |
---|
1100 | case JFFS2_NODETYPE_INODE: |
---|
1101 | |
---|
1102 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode) && |
---|
1103 | len < sizeof(struct jffs2_raw_inode)) { |
---|
1104 | err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf); |
---|
1105 | if (unlikely(err)) |
---|
1106 | goto free_out; |
---|
1107 | } |
---|
1108 | |
---|
1109 | err = read_dnode(c, ref, &node->i, len, rii); |
---|
1110 | if (unlikely(err)) |
---|
1111 | goto free_out; |
---|
1112 | |
---|
1113 | break; |
---|
1114 | |
---|
1115 | default: |
---|
1116 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node) && |
---|
1117 | len < sizeof(struct jffs2_unknown_node)) { |
---|
1118 | err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf); |
---|
1119 | if (unlikely(err)) |
---|
1120 | goto free_out; |
---|
1121 | } |
---|
1122 | |
---|
1123 | err = read_unknown(c, ref, &node->u); |
---|
1124 | if (unlikely(err)) |
---|
1125 | goto free_out; |
---|
1126 | |
---|
1127 | } |
---|
1128 | cont: |
---|
1129 | spin_lock(&c->erase_completion_lock); |
---|
1130 | } |
---|
1131 | |
---|
1132 | spin_unlock(&c->erase_completion_lock); |
---|
1133 | kfree(buf); |
---|
1134 | |
---|
1135 | f->highest_version = rii->highest_version; |
---|
1136 | |
---|
1137 | dbg_readinode("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n", |
---|
1138 | f->inocache->ino, rii->highest_version, rii->latest_mctime, |
---|
1139 | rii->mctime_ver); |
---|
1140 | return 0; |
---|
1141 | |
---|
1142 | free_out: |
---|
1143 | jffs2_free_tmp_dnode_info_list(&rii->tn_root); |
---|
1144 | jffs2_free_full_dirent_list(rii->fds); |
---|
1145 | rii->fds = NULL; |
---|
1146 | kfree(buf); |
---|
1147 | return err; |
---|
1148 | } |
---|
1149 | |
---|
1150 | static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, |
---|
1151 | struct jffs2_inode_info *f, |
---|
1152 | struct jffs2_raw_inode *latest_node) |
---|
1153 | { |
---|
1154 | struct jffs2_readinode_info rii; |
---|
1155 | uint32_t crc, new_size; |
---|
1156 | size_t retlen; |
---|
1157 | int ret; |
---|
1158 | |
---|
1159 | dbg_readinode("ino #%u pino/nlink is %d\n", f->inocache->ino, |
---|
1160 | f->inocache->pino_nlink); |
---|
1161 | |
---|
1162 | memset(&rii, 0, sizeof(rii)); |
---|
1163 | |
---|
1164 | /* Grab all nodes relevant to this ino */ |
---|
1165 | ret = jffs2_get_inode_nodes(c, f, &rii); |
---|
1166 | |
---|
1167 | if (ret) { |
---|
1168 | JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); |
---|
1169 | if (f->inocache->state == INO_STATE_READING) |
---|
1170 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1171 | return ret; |
---|
1172 | } |
---|
1173 | |
---|
1174 | ret = jffs2_build_inode_fragtree(c, f, &rii); |
---|
1175 | if (ret) { |
---|
1176 | JFFS2_ERROR("Failed to build final fragtree for inode #%u: error %d\n", |
---|
1177 | f->inocache->ino, ret); |
---|
1178 | if (f->inocache->state == INO_STATE_READING) |
---|
1179 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1180 | jffs2_free_tmp_dnode_info_list(&rii.tn_root); |
---|
1181 | /* FIXME: We could at least crc-check them all */ |
---|
1182 | if (rii.mdata_tn) { |
---|
1183 | jffs2_free_full_dnode(rii.mdata_tn->fn); |
---|
1184 | jffs2_free_tmp_dnode_info(rii.mdata_tn); |
---|
1185 | rii.mdata_tn = NULL; |
---|
1186 | } |
---|
1187 | return ret; |
---|
1188 | } |
---|
1189 | |
---|
1190 | if (rii.mdata_tn) { |
---|
1191 | if (rii.mdata_tn->fn->raw == rii.latest_ref) { |
---|
1192 | f->metadata = rii.mdata_tn->fn; |
---|
1193 | jffs2_free_tmp_dnode_info(rii.mdata_tn); |
---|
1194 | } else { |
---|
1195 | jffs2_kill_tn(c, rii.mdata_tn); |
---|
1196 | } |
---|
1197 | rii.mdata_tn = NULL; |
---|
1198 | } |
---|
1199 | |
---|
1200 | f->dents = rii.fds; |
---|
1201 | |
---|
1202 | jffs2_dbg_fragtree_paranoia_check_nolock(f); |
---|
1203 | |
---|
1204 | if (unlikely(!rii.latest_ref)) { |
---|
1205 | /* No data nodes for this inode. */ |
---|
1206 | if (f->inocache->ino != 1) { |
---|
1207 | JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); |
---|
1208 | if (!rii.fds) { |
---|
1209 | if (f->inocache->state == INO_STATE_READING) |
---|
1210 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1211 | return -EIO; |
---|
1212 | } |
---|
1213 | JFFS2_NOTICE("but it has children so we fake some modes for it\n"); |
---|
1214 | } |
---|
1215 | latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); |
---|
1216 | latest_node->version = cpu_to_je32(0); |
---|
1217 | latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); |
---|
1218 | latest_node->isize = cpu_to_je32(0); |
---|
1219 | latest_node->gid = cpu_to_je16(0); |
---|
1220 | latest_node->uid = cpu_to_je16(0); |
---|
1221 | if (f->inocache->state == INO_STATE_READING) |
---|
1222 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
---|
1223 | return 0; |
---|
1224 | } |
---|
1225 | |
---|
1226 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref), sizeof(*latest_node), &retlen, (void *)latest_node); |
---|
1227 | if (ret || retlen != sizeof(*latest_node)) { |
---|
1228 | JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", |
---|
1229 | ret, retlen, sizeof(*latest_node)); |
---|
1230 | /* FIXME: If this fails, there seems to be a memory leak. Find it. */ |
---|
1231 | return ret ? ret : -EIO; |
---|
1232 | } |
---|
1233 | |
---|
1234 | crc = crc32(0, latest_node, sizeof(*latest_node)-8); |
---|
1235 | if (crc != je32_to_cpu(latest_node->node_crc)) { |
---|
1236 | JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", |
---|
1237 | f->inocache->ino, ref_offset(rii.latest_ref)); |
---|
1238 | return -EIO; |
---|
1239 | } |
---|
1240 | |
---|
1241 | switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { |
---|
1242 | case S_IFDIR: |
---|
1243 | if (rii.mctime_ver > je32_to_cpu(latest_node->version)) { |
---|
1244 | /* The times in the latest_node are actually older than |
---|
1245 | mctime in the latest dirent. Cheat. */ |
---|
1246 | latest_node->ctime = latest_node->mtime = cpu_to_je32(rii.latest_mctime); |
---|
1247 | } |
---|
1248 | break; |
---|
1249 | |
---|
1250 | |
---|
1251 | case S_IFREG: |
---|
1252 | /* If it was a regular file, truncate it to the latest node's isize */ |
---|
1253 | new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); |
---|
1254 | if (new_size != je32_to_cpu(latest_node->isize)) { |
---|
1255 | JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n", |
---|
1256 | f->inocache->ino, je32_to_cpu(latest_node->isize), new_size); |
---|
1257 | latest_node->isize = cpu_to_je32(new_size); |
---|
1258 | } |
---|
1259 | break; |
---|
1260 | |
---|
1261 | case S_IFLNK: |
---|
1262 | /* Hack to work around broken isize in old symlink code. |
---|
1263 | Remove this when dwmw2 comes to his senses and stops |
---|
1264 | symlinks from being an entirely gratuitous special |
---|
1265 | case. */ |
---|
1266 | if (!je32_to_cpu(latest_node->isize)) |
---|
1267 | latest_node->isize = latest_node->dsize; |
---|
1268 | |
---|
1269 | if (f->inocache->state != INO_STATE_CHECKING) { |
---|
1270 | /* Symlink's inode data is the target path. Read it and |
---|
1271 | * keep in RAM to facilitate quick follow symlink |
---|
1272 | * operation. */ |
---|
1273 | uint32_t csize = je32_to_cpu(latest_node->csize); |
---|
1274 | if (csize > JFFS2_MAX_NAME_LEN) |
---|
1275 | return -ENAMETOOLONG; |
---|
1276 | f->target = kmalloc(csize + 1, GFP_KERNEL); |
---|
1277 | if (!f->target) { |
---|
1278 | JFFS2_ERROR("can't allocate %u bytes of memory for the symlink target path cache\n", csize); |
---|
1279 | return -ENOMEM; |
---|
1280 | } |
---|
1281 | |
---|
1282 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref) + sizeof(*latest_node), |
---|
1283 | csize, &retlen, (char *)f->target); |
---|
1284 | |
---|
1285 | if (ret || retlen != csize) { |
---|
1286 | if (retlen != csize) |
---|
1287 | ret = -EIO; |
---|
1288 | kfree(f->target); |
---|
1289 | f->target = NULL; |
---|
1290 | return ret; |
---|
1291 | } |
---|
1292 | |
---|
1293 | f->target[csize] = '\0'; |
---|
1294 | dbg_readinode("symlink's target '%s' cached\n", f->target); |
---|
1295 | } |
---|
1296 | |
---|
1297 | /* fall through... */ |
---|
1298 | |
---|
1299 | case S_IFBLK: |
---|
1300 | case S_IFCHR: |
---|
1301 | /* Certain inode types should have only one data node, and it's |
---|
1302 | kept as the metadata node */ |
---|
1303 | if (f->metadata) { |
---|
1304 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", |
---|
1305 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1306 | return -EIO; |
---|
1307 | } |
---|
1308 | if (!frag_first(&f->fragtree)) { |
---|
1309 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", |
---|
1310 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1311 | return -EIO; |
---|
1312 | } |
---|
1313 | /* ASSERT: f->fraglist != NULL */ |
---|
1314 | if (frag_next(frag_first(&f->fragtree))) { |
---|
1315 | JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", |
---|
1316 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1317 | /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ |
---|
1318 | return -EIO; |
---|
1319 | } |
---|
1320 | /* OK. We're happy */ |
---|
1321 | f->metadata = frag_first(&f->fragtree)->node; |
---|
1322 | jffs2_free_node_frag(frag_first(&f->fragtree)); |
---|
1323 | f->fragtree = RB_ROOT; |
---|
1324 | break; |
---|
1325 | } |
---|
1326 | if (f->inocache->state == INO_STATE_READING) |
---|
1327 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
---|
1328 | |
---|
1329 | return 0; |
---|
1330 | } |
---|
1331 | |
---|
1332 | /* Scan the list of all nodes present for this ino, build map of versions, etc. */ |
---|
1333 | int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
---|
1334 | uint32_t ino, struct jffs2_raw_inode *latest_node) |
---|
1335 | { |
---|
1336 | dbg_readinode("read inode #%u\n", ino); |
---|
1337 | |
---|
1338 | retry_inocache: |
---|
1339 | spin_lock(&c->inocache_lock); |
---|
1340 | f->inocache = jffs2_get_ino_cache(c, ino); |
---|
1341 | |
---|
1342 | if (f->inocache) { |
---|
1343 | /* Check its state. We may need to wait before we can use it */ |
---|
1344 | switch(f->inocache->state) { |
---|
1345 | case INO_STATE_UNCHECKED: |
---|
1346 | case INO_STATE_CHECKEDABSENT: |
---|
1347 | f->inocache->state = INO_STATE_READING; |
---|
1348 | break; |
---|
1349 | |
---|
1350 | case INO_STATE_CHECKING: |
---|
1351 | case INO_STATE_GC: |
---|
1352 | /* If it's in either of these states, we need |
---|
1353 | to wait for whoever's got it to finish and |
---|
1354 | put it back. */ |
---|
1355 | dbg_readinode("waiting for ino #%u in state %d\n", ino, f->inocache->state); |
---|
1356 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
---|
1357 | goto retry_inocache; |
---|
1358 | |
---|
1359 | case INO_STATE_READING: |
---|
1360 | case INO_STATE_PRESENT: |
---|
1361 | /* Eep. This should never happen. It can |
---|
1362 | happen if Linux calls read_inode() again |
---|
1363 | before clear_inode() has finished though. */ |
---|
1364 | JFFS2_ERROR("Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state); |
---|
1365 | /* Fail. That's probably better than allowing it to succeed */ |
---|
1366 | f->inocache = NULL; |
---|
1367 | break; |
---|
1368 | |
---|
1369 | default: |
---|
1370 | BUG(); |
---|
1371 | } |
---|
1372 | } |
---|
1373 | spin_unlock(&c->inocache_lock); |
---|
1374 | |
---|
1375 | if (!f->inocache && ino == 1) { |
---|
1376 | /* Special case - no root inode on medium */ |
---|
1377 | f->inocache = jffs2_alloc_inode_cache(); |
---|
1378 | if (!f->inocache) { |
---|
1379 | JFFS2_ERROR("cannot allocate inocache for root inode\n"); |
---|
1380 | return -ENOMEM; |
---|
1381 | } |
---|
1382 | dbg_readinode("creating inocache for root inode\n"); |
---|
1383 | memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); |
---|
1384 | f->inocache->ino = f->inocache->pino_nlink = 1; |
---|
1385 | f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; |
---|
1386 | f->inocache->state = INO_STATE_READING; |
---|
1387 | jffs2_add_ino_cache(c, f->inocache); |
---|
1388 | } |
---|
1389 | if (!f->inocache) { |
---|
1390 | JFFS2_ERROR("requested to read a nonexistent ino %u\n", ino); |
---|
1391 | return -ENOENT; |
---|
1392 | } |
---|
1393 | |
---|
1394 | return jffs2_do_read_inode_internal(c, f, latest_node); |
---|
1395 | } |
---|
1396 | |
---|
1397 | int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
---|
1398 | { |
---|
1399 | struct jffs2_raw_inode n; |
---|
1400 | struct jffs2_inode_info *f = kzalloc(sizeof(*f), GFP_KERNEL); |
---|
1401 | int ret; |
---|
1402 | |
---|
1403 | if (!f) |
---|
1404 | return -ENOMEM; |
---|
1405 | |
---|
1406 | mutex_init(&f->sem); |
---|
1407 | mutex_lock(&f->sem); |
---|
1408 | f->inocache = ic; |
---|
1409 | |
---|
1410 | ret = jffs2_do_read_inode_internal(c, f, &n); |
---|
1411 | mutex_unlock(&f->sem); |
---|
1412 | jffs2_do_clear_inode(c, f); |
---|
1413 | jffs2_xattr_do_crccheck_inode(c, ic); |
---|
1414 | kfree (f); |
---|
1415 | return ret; |
---|
1416 | } |
---|
1417 | |
---|
1418 | void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f) |
---|
1419 | { |
---|
1420 | struct jffs2_full_dirent *fd, *fds; |
---|
1421 | int deleted; |
---|
1422 | |
---|
1423 | jffs2_xattr_delete_inode(c, f->inocache); |
---|
1424 | mutex_lock(&f->sem); |
---|
1425 | deleted = f->inocache && !f->inocache->pino_nlink; |
---|
1426 | |
---|
1427 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) |
---|
1428 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CLEARING); |
---|
1429 | |
---|
1430 | if (f->metadata) { |
---|
1431 | if (deleted) |
---|
1432 | jffs2_mark_node_obsolete(c, f->metadata->raw); |
---|
1433 | jffs2_free_full_dnode(f->metadata); |
---|
1434 | } |
---|
1435 | |
---|
1436 | jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL); |
---|
1437 | |
---|
1438 | if (f->target) { |
---|
1439 | kfree(f->target); |
---|
1440 | f->target = NULL; |
---|
1441 | } |
---|
1442 | |
---|
1443 | fds = f->dents; |
---|
1444 | while(fds) { |
---|
1445 | fd = fds; |
---|
1446 | fds = fd->next; |
---|
1447 | jffs2_free_full_dirent(fd); |
---|
1448 | } |
---|
1449 | |
---|
1450 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) { |
---|
1451 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1452 | if (f->inocache->nodes == (void *)f->inocache) |
---|
1453 | jffs2_del_ino_cache(c, f->inocache); |
---|
1454 | } |
---|
1455 | |
---|
1456 | mutex_unlock(&f->sem); |
---|
1457 | } |
---|