1 | /* |
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2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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3 | * |
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4 | * Copyright © 2001-2007 Red Hat, Inc. |
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5 | * |
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6 | * Created by David Woodhouse <dwmw2@infradead.org> |
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7 | * |
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8 | * For licensing information, see the file 'LICENCE' in this directory. |
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9 | * |
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10 | */ |
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11 | |
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12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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13 | |
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14 | #include <linux/kernel.h> |
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15 | #include <linux/sched.h> |
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16 | #include <linux/slab.h> |
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17 | #include <linux/fs.h> |
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18 | #include <linux/crc32.h> |
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19 | #include <linux/pagemap.h> |
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20 | #include <linux/mtd/mtd.h> |
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21 | #include <linux/compiler.h> |
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22 | #include "nodelist.h" |
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23 | |
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24 | /* |
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25 | * Check the data CRC of the node. |
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26 | * |
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27 | * Returns: 0 if the data CRC is correct; |
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28 | * 1 - if incorrect; |
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29 | * error code if an error occurred. |
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30 | */ |
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31 | static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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32 | { |
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33 | struct jffs2_raw_node_ref *ref = tn->fn->raw; |
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34 | int err = 0, pointed = 0; |
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35 | struct jffs2_eraseblock *jeb; |
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36 | unsigned char *buffer; |
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37 | uint32_t crc, ofs, len; |
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38 | size_t retlen; |
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39 | |
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40 | BUG_ON(tn->csize == 0); |
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41 | |
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42 | /* Calculate how many bytes were already checked */ |
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43 | ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); |
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44 | len = tn->csize; |
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45 | |
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46 | if (jffs2_is_writebuffered(c)) { |
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47 | int adj = ofs % c->wbuf_pagesize; |
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48 | if (likely(adj)) |
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49 | adj = c->wbuf_pagesize - adj; |
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50 | |
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51 | if (adj >= tn->csize) { |
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52 | 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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53 | ref_offset(ref), tn->csize, ofs); |
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54 | goto adj_acc; |
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55 | } |
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56 | |
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57 | ofs += adj; |
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58 | len -= adj; |
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59 | } |
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60 | |
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61 | 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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62 | ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len); |
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63 | |
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64 | #ifndef __ECOS |
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65 | /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(), |
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66 | * adding and jffs2_flash_read_end() interface. */ |
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67 | err = mtd_point(c->mtd, ofs, len, &retlen, (void **)&buffer, NULL); |
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68 | if (!err && retlen < len) { |
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69 | JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize); |
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70 | mtd_unpoint(c->mtd, ofs, retlen); |
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71 | } else if (err) { |
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72 | if (err != -EOPNOTSUPP) |
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73 | JFFS2_WARNING("MTD point failed: error code %d.\n", err); |
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74 | } else |
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75 | pointed = 1; /* succefully pointed to device */ |
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76 | #endif |
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77 | |
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78 | if (!pointed) { |
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79 | buffer = kmalloc(len, GFP_KERNEL); |
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80 | if (unlikely(!buffer)) |
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81 | return -ENOMEM; |
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82 | |
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83 | /* TODO: this is very frequent pattern, make it a separate |
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84 | * routine */ |
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85 | err = jffs2_flash_read(c, ofs, len, &retlen, buffer); |
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86 | if (err) { |
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87 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err); |
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88 | goto free_out; |
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89 | } |
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90 | |
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91 | if (retlen != len) { |
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92 | JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len); |
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93 | err = -EIO; |
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94 | goto free_out; |
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95 | } |
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96 | } |
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97 | |
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98 | /* Continue calculating CRC */ |
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99 | crc = crc32(tn->partial_crc, buffer, len); |
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100 | if(!pointed) |
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101 | kfree(buffer); |
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102 | #ifndef __ECOS |
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103 | else |
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104 | mtd_unpoint(c->mtd, ofs, len); |
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105 | #endif |
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106 | |
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107 | if (crc != tn->data_crc) { |
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108 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
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109 | ref_offset(ref), tn->data_crc, crc); |
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110 | return 1; |
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111 | } |
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112 | |
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113 | adj_acc: |
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114 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
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115 | len = ref_totlen(c, jeb, ref); |
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116 | /* If it should be REF_NORMAL, it'll get marked as such when |
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117 | we build the fragtree, shortly. No need to worry about GC |
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118 | moving it while it's marked REF_PRISTINE -- GC won't happen |
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119 | till we've finished checking every inode anyway. */ |
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120 | ref->flash_offset |= REF_PRISTINE; |
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121 | /* |
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122 | * Mark the node as having been checked and fix the |
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123 | * accounting accordingly. |
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124 | */ |
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125 | spin_lock(&c->erase_completion_lock); |
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126 | jeb->used_size += len; |
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127 | jeb->unchecked_size -= len; |
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128 | c->used_size += len; |
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129 | c->unchecked_size -= len; |
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130 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
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131 | spin_unlock(&c->erase_completion_lock); |
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132 | |
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133 | return 0; |
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134 | |
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135 | free_out: |
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136 | if(!pointed) |
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137 | kfree(buffer); |
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138 | #ifndef __ECOS |
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139 | else |
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140 | mtd_unpoint(c->mtd, ofs, len); |
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141 | #endif |
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142 | return err; |
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143 | } |
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144 | |
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145 | /* |
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146 | * Helper function for jffs2_add_older_frag_to_fragtree(). |
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147 | * |
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148 | * Checks the node if we are in the checking stage. |
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149 | */ |
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150 | static int check_tn_node(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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151 | { |
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152 | int ret; |
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153 | |
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154 | BUG_ON(ref_obsolete(tn->fn->raw)); |
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155 | |
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156 | /* We only check the data CRC of unchecked nodes */ |
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157 | if (ref_flags(tn->fn->raw) != REF_UNCHECKED) |
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158 | return 0; |
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159 | |
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160 | dbg_readinode("check node %#04x-%#04x, phys offs %#08x\n", |
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161 | tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw)); |
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162 | |
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163 | ret = check_node_data(c, tn); |
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164 | if (unlikely(ret < 0)) { |
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165 | JFFS2_ERROR("check_node_data() returned error: %d.\n", |
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166 | ret); |
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167 | } else if (unlikely(ret > 0)) { |
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168 | dbg_readinode("CRC error, mark it obsolete.\n"); |
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169 | jffs2_mark_node_obsolete(c, tn->fn->raw); |
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170 | } |
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171 | |
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172 | return ret; |
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173 | } |
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174 | |
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175 | static struct jffs2_tmp_dnode_info *jffs2_lookup_tn(struct rb_root *tn_root, uint32_t offset) |
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176 | { |
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177 | struct rb_node *next; |
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178 | struct jffs2_tmp_dnode_info *tn = NULL; |
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179 | |
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180 | dbg_readinode("root %p, offset %d\n", tn_root, offset); |
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181 | |
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182 | next = tn_root->rb_node; |
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183 | |
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184 | while (next) { |
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185 | tn = rb_entry(next, struct jffs2_tmp_dnode_info, rb); |
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186 | |
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187 | if (tn->fn->ofs < offset) |
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188 | next = tn->rb.rb_right; |
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189 | else if (tn->fn->ofs >= offset) |
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190 | next = tn->rb.rb_left; |
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191 | else |
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192 | break; |
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193 | } |
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194 | |
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195 | return tn; |
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196 | } |
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197 | |
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198 | |
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199 | static void jffs2_kill_tn(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
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200 | { |
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201 | jffs2_mark_node_obsolete(c, tn->fn->raw); |
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202 | jffs2_free_full_dnode(tn->fn); |
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203 | jffs2_free_tmp_dnode_info(tn); |
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204 | } |
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205 | /* |
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206 | * This function is used when we read an inode. Data nodes arrive in |
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207 | * arbitrary order -- they may be older or newer than the nodes which |
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208 | * are already in the tree. Where overlaps occur, the older node can |
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209 | * be discarded as long as the newer passes the CRC check. We don't |
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210 | * bother to keep track of holes in this rbtree, and neither do we deal |
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211 | * with frags -- we can have multiple entries starting at the same |
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212 | * offset, and the one with the smallest length will come first in the |
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213 | * ordering. |
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214 | * |
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215 | * Returns 0 if the node was handled (including marking it obsolete) |
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216 | * < 0 an if error occurred |
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217 | */ |
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218 | static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c, |
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219 | struct jffs2_readinode_info *rii, |
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220 | struct jffs2_tmp_dnode_info *tn) |
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221 | { |
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222 | uint32_t fn_end = tn->fn->ofs + tn->fn->size; |
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223 | struct jffs2_tmp_dnode_info *this, *ptn; |
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224 | |
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225 | 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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226 | |
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227 | /* If a node has zero dsize, we only have to keep if it if it might be the |
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228 | node with highest version -- i.e. the one which will end up as f->metadata. |
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229 | Note that such nodes won't be REF_UNCHECKED since there are no data to |
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230 | check anyway. */ |
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231 | if (!tn->fn->size) { |
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232 | if (rii->mdata_tn) { |
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233 | if (rii->mdata_tn->version < tn->version) { |
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234 | /* We had a candidate mdata node already */ |
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235 | dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version); |
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236 | jffs2_kill_tn(c, rii->mdata_tn); |
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237 | } else { |
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238 | dbg_readinode("kill new mdata with ver %d (older than existing %d\n", |
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239 | tn->version, rii->mdata_tn->version); |
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240 | jffs2_kill_tn(c, tn); |
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241 | return 0; |
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242 | } |
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243 | } |
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244 | rii->mdata_tn = tn; |
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245 | dbg_readinode("keep new mdata with ver %d\n", tn->version); |
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246 | return 0; |
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247 | } |
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248 | |
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249 | /* Find the earliest node which _may_ be relevant to this one */ |
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250 | this = jffs2_lookup_tn(&rii->tn_root, tn->fn->ofs); |
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251 | if (this) { |
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252 | /* If the node is coincident with another at a lower address, |
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253 | back up until the other node is found. It may be relevant */ |
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254 | while (this->overlapped) { |
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255 | ptn = tn_prev(this); |
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256 | if (!ptn) { |
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257 | /* |
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258 | * We killed a node which set the overlapped |
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259 | * flags during the scan. Fix it up. |
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260 | */ |
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261 | this->overlapped = 0; |
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262 | break; |
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263 | } |
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264 | this = ptn; |
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265 | } |
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266 | 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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267 | } |
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268 | |
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269 | while (this) { |
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270 | if (this->fn->ofs > fn_end) |
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271 | break; |
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272 | dbg_readinode("Ponder this ver %d, 0x%x-0x%x\n", |
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273 | this->version, this->fn->ofs, this->fn->size); |
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274 | |
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275 | if (this->version == tn->version) { |
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276 | /* Version number collision means REF_PRISTINE GC. Accept either of them |
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277 | as long as the CRC is correct. Check the one we have already... */ |
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278 | if (!check_tn_node(c, this)) { |
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279 | /* The one we already had was OK. Keep it and throw away the new one */ |
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280 | dbg_readinode("Like old node. Throw away new\n"); |
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281 | jffs2_kill_tn(c, tn); |
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282 | return 0; |
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283 | } else { |
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284 | /* Who cares if the new one is good; keep it for now anyway. */ |
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285 | dbg_readinode("Like new node. Throw away old\n"); |
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286 | rb_replace_node(&this->rb, &tn->rb, &rii->tn_root); |
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287 | jffs2_kill_tn(c, this); |
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288 | /* Same overlapping from in front and behind */ |
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289 | return 0; |
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290 | } |
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291 | } |
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292 | if (this->version < tn->version && |
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293 | this->fn->ofs >= tn->fn->ofs && |
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294 | this->fn->ofs + this->fn->size <= fn_end) { |
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295 | /* New node entirely overlaps 'this' */ |
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296 | if (check_tn_node(c, tn)) { |
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297 | dbg_readinode("new node bad CRC\n"); |
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298 | jffs2_kill_tn(c, tn); |
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299 | return 0; |
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300 | } |
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301 | /* ... and is good. Kill 'this' and any subsequent nodes which are also overlapped */ |
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302 | while (this && this->fn->ofs + this->fn->size <= fn_end) { |
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303 | struct jffs2_tmp_dnode_info *next = tn_next(this); |
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304 | if (this->version < tn->version) { |
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305 | tn_erase(this, &rii->tn_root); |
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306 | dbg_readinode("Kill overlapped ver %d, 0x%x-0x%x\n", |
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307 | this->version, this->fn->ofs, |
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308 | this->fn->ofs+this->fn->size); |
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309 | jffs2_kill_tn(c, this); |
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310 | } |
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311 | this = next; |
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312 | } |
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313 | dbg_readinode("Done killing overlapped nodes\n"); |
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314 | continue; |
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315 | } |
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316 | if (this->version > tn->version && |
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317 | this->fn->ofs <= tn->fn->ofs && |
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318 | this->fn->ofs+this->fn->size >= fn_end) { |
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319 | /* New node entirely overlapped by 'this' */ |
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320 | if (!check_tn_node(c, this)) { |
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321 | dbg_readinode("Good CRC on old node. Kill new\n"); |
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322 | jffs2_kill_tn(c, tn); |
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323 | return 0; |
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324 | } |
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325 | /* ... but 'this' was bad. Replace it... */ |
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326 | dbg_readinode("Bad CRC on old overlapping node. Kill it\n"); |
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327 | tn_erase(this, &rii->tn_root); |
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328 | jffs2_kill_tn(c, this); |
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329 | break; |
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330 | } |
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331 | |
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332 | this = tn_next(this); |
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333 | } |
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334 | |
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335 | /* We neither completely obsoleted nor were completely |
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336 | obsoleted by an earlier node. Insert into the tree */ |
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337 | { |
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338 | struct rb_node *parent; |
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339 | struct rb_node **link = &rii->tn_root.rb_node; |
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340 | struct jffs2_tmp_dnode_info *insert_point = NULL; |
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341 | |
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342 | while (*link) { |
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343 | parent = *link; |
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344 | insert_point = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
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345 | if (tn->fn->ofs > insert_point->fn->ofs) |
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346 | link = &insert_point->rb.rb_right; |
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347 | else if (tn->fn->ofs < insert_point->fn->ofs || |
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348 | tn->fn->size < insert_point->fn->size) |
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349 | link = &insert_point->rb.rb_left; |
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350 | else |
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351 | link = &insert_point->rb.rb_right; |
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352 | } |
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353 | rb_link_node(&tn->rb, &insert_point->rb, link); |
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354 | rb_insert_color(&tn->rb, &rii->tn_root); |
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355 | } |
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356 | |
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357 | /* If there's anything behind that overlaps us, note it */ |
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358 | this = tn_prev(tn); |
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359 | if (this) { |
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360 | while (1) { |
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361 | if (this->fn->ofs + this->fn->size > tn->fn->ofs) { |
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362 | dbg_readinode("Node is overlapped by %p (v %d, 0x%x-0x%x)\n", |
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363 | this, this->version, this->fn->ofs, |
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364 | this->fn->ofs+this->fn->size); |
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365 | tn->overlapped = 1; |
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366 | break; |
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367 | } |
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368 | if (!this->overlapped) |
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369 | break; |
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370 | |
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371 | ptn = tn_prev(this); |
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372 | if (!ptn) { |
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373 | /* |
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374 | * We killed a node which set the overlapped |
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375 | * flags during the scan. Fix it up. |
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376 | */ |
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377 | this->overlapped = 0; |
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378 | break; |
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379 | } |
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380 | this = ptn; |
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381 | } |
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382 | } |
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383 | |
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384 | /* If the new node overlaps anything ahead, note it */ |
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385 | this = tn_next(tn); |
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386 | while (this && this->fn->ofs < fn_end) { |
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387 | this->overlapped = 1; |
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388 | dbg_readinode("Node ver %d, 0x%x-0x%x is overlapped\n", |
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389 | this->version, this->fn->ofs, |
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390 | this->fn->ofs+this->fn->size); |
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391 | this = tn_next(this); |
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392 | } |
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393 | return 0; |
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394 | } |
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395 | |
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396 | /* Trivial function to remove the last node in the tree. Which by definition |
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397 | has no right-hand child â so can be removed just by making its left-hand |
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398 | child (if any) take its place under its parent. Since this is only done |
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399 | when we're consuming the whole tree, there's no need to use rb_erase() |
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400 | and let it worry about adjusting colours and balancing the tree. That |
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401 | would just be a waste of time. */ |
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402 | static void eat_last(struct rb_root *root, struct rb_node *node) |
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403 | { |
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404 | struct rb_node *parent = rb_parent(node); |
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405 | struct rb_node **link; |
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406 | |
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407 | /* LAST! */ |
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408 | BUG_ON(node->rb_right); |
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409 | |
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410 | if (!parent) |
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411 | link = &root->rb_node; |
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412 | else if (node == parent->rb_left) |
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413 | link = &parent->rb_left; |
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414 | else |
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415 | link = &parent->rb_right; |
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416 | |
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417 | *link = node->rb_left; |
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418 | if (node->rb_left) |
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419 | node->rb_left->__rb_parent_color = node->__rb_parent_color; |
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420 | } |
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421 | |
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422 | /* We put the version tree in reverse order, so we can use the same eat_last() |
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423 | function that we use to consume the tmpnode tree (tn_root). */ |
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424 | static void ver_insert(struct rb_root *ver_root, struct jffs2_tmp_dnode_info *tn) |
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425 | { |
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426 | struct rb_node **link = &ver_root->rb_node; |
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427 | struct rb_node *parent = NULL; |
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428 | struct jffs2_tmp_dnode_info *this_tn; |
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429 | |
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430 | while (*link) { |
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431 | parent = *link; |
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432 | this_tn = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
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433 | |
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434 | if (tn->version > this_tn->version) |
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435 | link = &parent->rb_left; |
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436 | else |
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437 | link = &parent->rb_right; |
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438 | } |
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439 | dbg_readinode("Link new node at %p (root is %p)\n", link, ver_root); |
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440 | rb_link_node(&tn->rb, parent, link); |
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441 | rb_insert_color(&tn->rb, ver_root); |
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442 | } |
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443 | |
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444 | /* Build final, normal fragtree from tn tree. It doesn't matter which order |
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445 | we add nodes to the real fragtree, as long as they don't overlap. And |
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446 | having thrown away the majority of overlapped nodes as we went, there |
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447 | really shouldn't be many sets of nodes which do overlap. If we start at |
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448 | the end, we can use the overlap markers -- we can just eat nodes which |
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449 | aren't overlapped, and when we encounter nodes which _do_ overlap we |
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450 | sort them all into a temporary tree in version order before replaying them. */ |
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451 | static int jffs2_build_inode_fragtree(struct jffs2_sb_info *c, |
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452 | struct jffs2_inode_info *f, |
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453 | struct jffs2_readinode_info *rii) |
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454 | { |
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455 | struct jffs2_tmp_dnode_info *pen, *last, *this; |
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456 | struct rb_root ver_root = RB_ROOT; |
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457 | uint32_t high_ver = 0; |
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458 | |
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459 | if (rii->mdata_tn) { |
---|
460 | dbg_readinode("potential mdata is ver %d at %p\n", rii->mdata_tn->version, rii->mdata_tn); |
---|
461 | high_ver = rii->mdata_tn->version; |
---|
462 | rii->latest_ref = rii->mdata_tn->fn->raw; |
---|
463 | } |
---|
464 | #ifdef JFFS2_DBG_READINODE_MESSAGES |
---|
465 | this = tn_last(&rii->tn_root); |
---|
466 | while (this) { |
---|
467 | dbg_readinode("tn %p ver %d range 0x%x-0x%x ov %d\n", this, this->version, this->fn->ofs, |
---|
468 | this->fn->ofs+this->fn->size, this->overlapped); |
---|
469 | this = tn_prev(this); |
---|
470 | } |
---|
471 | #endif |
---|
472 | pen = tn_last(&rii->tn_root); |
---|
473 | while ((last = pen)) { |
---|
474 | pen = tn_prev(last); |
---|
475 | |
---|
476 | eat_last(&rii->tn_root, &last->rb); |
---|
477 | ver_insert(&ver_root, last); |
---|
478 | |
---|
479 | if (unlikely(last->overlapped)) { |
---|
480 | if (pen) |
---|
481 | continue; |
---|
482 | /* |
---|
483 | * We killed a node which set the overlapped |
---|
484 | * flags during the scan. Fix it up. |
---|
485 | */ |
---|
486 | last->overlapped = 0; |
---|
487 | } |
---|
488 | |
---|
489 | /* Now we have a bunch of nodes in reverse version |
---|
490 | order, in the tree at ver_root. Most of the time, |
---|
491 | there'll actually be only one node in the 'tree', |
---|
492 | in fact. */ |
---|
493 | this = tn_last(&ver_root); |
---|
494 | |
---|
495 | while (this) { |
---|
496 | struct jffs2_tmp_dnode_info *vers_next; |
---|
497 | int ret; |
---|
498 | vers_next = tn_prev(this); |
---|
499 | eat_last(&ver_root, &this->rb); |
---|
500 | if (check_tn_node(c, this)) { |
---|
501 | dbg_readinode("node ver %d, 0x%x-0x%x failed CRC\n", |
---|
502 | this->version, this->fn->ofs, |
---|
503 | this->fn->ofs+this->fn->size); |
---|
504 | jffs2_kill_tn(c, this); |
---|
505 | } else { |
---|
506 | if (this->version > high_ver) { |
---|
507 | /* Note that this is different from the other |
---|
508 | highest_version, because this one is only |
---|
509 | counting _valid_ nodes which could give the |
---|
510 | latest inode metadata */ |
---|
511 | high_ver = this->version; |
---|
512 | rii->latest_ref = this->fn->raw; |
---|
513 | } |
---|
514 | dbg_readinode("Add %p (v %d, 0x%x-0x%x, ov %d) to fragtree\n", |
---|
515 | this, this->version, this->fn->ofs, |
---|
516 | this->fn->ofs+this->fn->size, this->overlapped); |
---|
517 | |
---|
518 | ret = jffs2_add_full_dnode_to_inode(c, f, this->fn); |
---|
519 | if (ret) { |
---|
520 | /* Free the nodes in vers_root; let the caller |
---|
521 | deal with the rest */ |
---|
522 | JFFS2_ERROR("Add node to tree failed %d\n", ret); |
---|
523 | while (1) { |
---|
524 | vers_next = tn_prev(this); |
---|
525 | if (check_tn_node(c, this)) |
---|
526 | jffs2_mark_node_obsolete(c, this->fn->raw); |
---|
527 | jffs2_free_full_dnode(this->fn); |
---|
528 | jffs2_free_tmp_dnode_info(this); |
---|
529 | this = vers_next; |
---|
530 | if (!this) |
---|
531 | break; |
---|
532 | eat_last(&ver_root, &vers_next->rb); |
---|
533 | } |
---|
534 | return ret; |
---|
535 | } |
---|
536 | jffs2_free_tmp_dnode_info(this); |
---|
537 | } |
---|
538 | this = vers_next; |
---|
539 | } |
---|
540 | } |
---|
541 | return 0; |
---|
542 | } |
---|
543 | |
---|
544 | static void jffs2_free_tmp_dnode_info_list(struct rb_root *list) |
---|
545 | { |
---|
546 | struct rb_node *this; |
---|
547 | struct jffs2_tmp_dnode_info *tn; |
---|
548 | |
---|
549 | this = list->rb_node; |
---|
550 | |
---|
551 | /* Now at bottom of tree */ |
---|
552 | while (this) { |
---|
553 | if (this->rb_left) |
---|
554 | this = this->rb_left; |
---|
555 | else if (this->rb_right) |
---|
556 | this = this->rb_right; |
---|
557 | else { |
---|
558 | tn = rb_entry(this, struct jffs2_tmp_dnode_info, rb); |
---|
559 | jffs2_free_full_dnode(tn->fn); |
---|
560 | jffs2_free_tmp_dnode_info(tn); |
---|
561 | |
---|
562 | this = rb_parent(this); |
---|
563 | if (!this) |
---|
564 | break; |
---|
565 | |
---|
566 | if (this->rb_left == &tn->rb) |
---|
567 | this->rb_left = NULL; |
---|
568 | else if (this->rb_right == &tn->rb) |
---|
569 | this->rb_right = NULL; |
---|
570 | else BUG(); |
---|
571 | } |
---|
572 | } |
---|
573 | *list = RB_ROOT; |
---|
574 | } |
---|
575 | |
---|
576 | static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) |
---|
577 | { |
---|
578 | struct jffs2_full_dirent *next; |
---|
579 | |
---|
580 | while (fd) { |
---|
581 | next = fd->next; |
---|
582 | jffs2_free_full_dirent(fd); |
---|
583 | fd = next; |
---|
584 | } |
---|
585 | } |
---|
586 | |
---|
587 | /* Returns first valid node after 'ref'. May return 'ref' */ |
---|
588 | static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref) |
---|
589 | { |
---|
590 | while (ref && ref->next_in_ino) { |
---|
591 | if (!ref_obsolete(ref)) |
---|
592 | return ref; |
---|
593 | dbg_noderef("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)); |
---|
594 | ref = ref->next_in_ino; |
---|
595 | } |
---|
596 | return NULL; |
---|
597 | } |
---|
598 | |
---|
599 | /* |
---|
600 | * Helper function for jffs2_get_inode_nodes(). |
---|
601 | * It is called every time an directory entry node is found. |
---|
602 | * |
---|
603 | * Returns: 0 on success; |
---|
604 | * negative error code on failure. |
---|
605 | */ |
---|
606 | static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
607 | struct jffs2_raw_dirent *rd, size_t read, |
---|
608 | struct jffs2_readinode_info *rii) |
---|
609 | { |
---|
610 | struct jffs2_full_dirent *fd; |
---|
611 | uint32_t crc; |
---|
612 | |
---|
613 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
---|
614 | BUG_ON(ref_obsolete(ref)); |
---|
615 | |
---|
616 | crc = crc32(0, rd, sizeof(*rd) - 8); |
---|
617 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
---|
618 | JFFS2_NOTICE("header CRC failed on dirent node at %#08x: read %#08x, calculated %#08x\n", |
---|
619 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
---|
620 | jffs2_mark_node_obsolete(c, ref); |
---|
621 | return 0; |
---|
622 | } |
---|
623 | |
---|
624 | /* If we've never checked the CRCs on this node, check them now */ |
---|
625 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
626 | struct jffs2_eraseblock *jeb; |
---|
627 | int len; |
---|
628 | |
---|
629 | /* Sanity check */ |
---|
630 | if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) { |
---|
631 | JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n", |
---|
632 | ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen)); |
---|
633 | jffs2_mark_node_obsolete(c, ref); |
---|
634 | return 0; |
---|
635 | } |
---|
636 | |
---|
637 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
638 | len = ref_totlen(c, jeb, ref); |
---|
639 | |
---|
640 | spin_lock(&c->erase_completion_lock); |
---|
641 | jeb->used_size += len; |
---|
642 | jeb->unchecked_size -= len; |
---|
643 | c->used_size += len; |
---|
644 | c->unchecked_size -= len; |
---|
645 | ref->flash_offset = ref_offset(ref) | dirent_node_state(rd); |
---|
646 | spin_unlock(&c->erase_completion_lock); |
---|
647 | } |
---|
648 | |
---|
649 | fd = jffs2_alloc_full_dirent(rd->nsize + 1); |
---|
650 | if (unlikely(!fd)) |
---|
651 | return -ENOMEM; |
---|
652 | |
---|
653 | fd->raw = ref; |
---|
654 | fd->version = je32_to_cpu(rd->version); |
---|
655 | fd->ino = je32_to_cpu(rd->ino); |
---|
656 | fd->type = rd->type; |
---|
657 | |
---|
658 | if (fd->version > rii->highest_version) |
---|
659 | rii->highest_version = fd->version; |
---|
660 | |
---|
661 | /* Pick out the mctime of the latest dirent */ |
---|
662 | if(fd->version > rii->mctime_ver && je32_to_cpu(rd->mctime)) { |
---|
663 | rii->mctime_ver = fd->version; |
---|
664 | rii->latest_mctime = je32_to_cpu(rd->mctime); |
---|
665 | } |
---|
666 | |
---|
667 | /* |
---|
668 | * Copy as much of the name as possible from the raw |
---|
669 | * dirent we've already read from the flash. |
---|
670 | */ |
---|
671 | if (read > sizeof(*rd)) |
---|
672 | memcpy(&fd->name[0], &rd->name[0], |
---|
673 | min_t(uint32_t, rd->nsize, (read - sizeof(*rd)) )); |
---|
674 | |
---|
675 | /* Do we need to copy any more of the name directly from the flash? */ |
---|
676 | if (rd->nsize + sizeof(*rd) > read) { |
---|
677 | /* FIXME: point() */ |
---|
678 | int err; |
---|
679 | int already = read - sizeof(*rd); |
---|
680 | |
---|
681 | err = jffs2_flash_read(c, (ref_offset(ref)) + read, |
---|
682 | rd->nsize - already, &read, &fd->name[already]); |
---|
683 | if (unlikely(read != rd->nsize - already) && likely(!err)) |
---|
684 | return -EIO; |
---|
685 | |
---|
686 | if (unlikely(err)) { |
---|
687 | JFFS2_ERROR("read remainder of name: error %d\n", err); |
---|
688 | jffs2_free_full_dirent(fd); |
---|
689 | return -EIO; |
---|
690 | } |
---|
691 | } |
---|
692 | |
---|
693 | fd->nhash = full_name_hash(fd->name, rd->nsize); |
---|
694 | fd->next = NULL; |
---|
695 | fd->name[rd->nsize] = '\0'; |
---|
696 | |
---|
697 | /* |
---|
698 | * Wheee. We now have a complete jffs2_full_dirent structure, with |
---|
699 | * the name in it and everything. Link it into the list |
---|
700 | */ |
---|
701 | jffs2_add_fd_to_list(c, fd, &rii->fds); |
---|
702 | |
---|
703 | return 0; |
---|
704 | } |
---|
705 | |
---|
706 | /* |
---|
707 | * Helper function for jffs2_get_inode_nodes(). |
---|
708 | * It is called every time an inode node is found. |
---|
709 | * |
---|
710 | * Returns: 0 on success (possibly after marking a bad node obsolete); |
---|
711 | * negative error code on failure. |
---|
712 | */ |
---|
713 | static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
714 | struct jffs2_raw_inode *rd, int rdlen, |
---|
715 | struct jffs2_readinode_info *rii) |
---|
716 | { |
---|
717 | struct jffs2_tmp_dnode_info *tn; |
---|
718 | uint32_t len, csize; |
---|
719 | int ret = 0; |
---|
720 | uint32_t crc; |
---|
721 | |
---|
722 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
---|
723 | BUG_ON(ref_obsolete(ref)); |
---|
724 | |
---|
725 | crc = crc32(0, rd, sizeof(*rd) - 8); |
---|
726 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
---|
727 | JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n", |
---|
728 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
---|
729 | jffs2_mark_node_obsolete(c, ref); |
---|
730 | return 0; |
---|
731 | } |
---|
732 | |
---|
733 | tn = jffs2_alloc_tmp_dnode_info(); |
---|
734 | if (!tn) { |
---|
735 | JFFS2_ERROR("failed to allocate tn (%zu bytes).\n", sizeof(*tn)); |
---|
736 | return -ENOMEM; |
---|
737 | } |
---|
738 | |
---|
739 | tn->partial_crc = 0; |
---|
740 | csize = je32_to_cpu(rd->csize); |
---|
741 | |
---|
742 | /* If we've never checked the CRCs on this node, check them now */ |
---|
743 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
744 | |
---|
745 | /* Sanity checks */ |
---|
746 | if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) || |
---|
747 | unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) { |
---|
748 | JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref)); |
---|
749 | jffs2_dbg_dump_node(c, ref_offset(ref)); |
---|
750 | jffs2_mark_node_obsolete(c, ref); |
---|
751 | goto free_out; |
---|
752 | } |
---|
753 | |
---|
754 | if (jffs2_is_writebuffered(c) && csize != 0) { |
---|
755 | /* At this point we are supposed to check the data CRC |
---|
756 | * of our unchecked node. But thus far, we do not |
---|
757 | * know whether the node is valid or obsolete. To |
---|
758 | * figure this out, we need to walk all the nodes of |
---|
759 | * the inode and build the inode fragtree. We don't |
---|
760 | * want to spend time checking data of nodes which may |
---|
761 | * later be found to be obsolete. So we put off the full |
---|
762 | * data CRC checking until we have read all the inode |
---|
763 | * nodes and have started building the fragtree. |
---|
764 | * |
---|
765 | * The fragtree is being built starting with nodes |
---|
766 | * having the highest version number, so we'll be able |
---|
767 | * to detect whether a node is valid (i.e., it is not |
---|
768 | * overlapped by a node with higher version) or not. |
---|
769 | * And we'll be able to check only those nodes, which |
---|
770 | * are not obsolete. |
---|
771 | * |
---|
772 | * Of course, this optimization only makes sense in case |
---|
773 | * of NAND flashes (or other flashes with |
---|
774 | * !jffs2_can_mark_obsolete()), since on NOR flashes |
---|
775 | * nodes are marked obsolete physically. |
---|
776 | * |
---|
777 | * Since NAND flashes (or other flashes with |
---|
778 | * jffs2_is_writebuffered(c)) are anyway read by |
---|
779 | * fractions of c->wbuf_pagesize, and we have just read |
---|
780 | * the node header, it is likely that the starting part |
---|
781 | * of the node data is also read when we read the |
---|
782 | * header. So we don't mind to check the CRC of the |
---|
783 | * starting part of the data of the node now, and check |
---|
784 | * the second part later (in jffs2_check_node_data()). |
---|
785 | * Of course, we will not need to re-read and re-check |
---|
786 | * the NAND page which we have just read. This is why we |
---|
787 | * read the whole NAND page at jffs2_get_inode_nodes(), |
---|
788 | * while we needed only the node header. |
---|
789 | */ |
---|
790 | unsigned char *buf; |
---|
791 | |
---|
792 | /* 'buf' will point to the start of data */ |
---|
793 | buf = (unsigned char *)rd + sizeof(*rd); |
---|
794 | /* len will be the read data length */ |
---|
795 | len = min_t(uint32_t, rdlen - sizeof(*rd), csize); |
---|
796 | tn->partial_crc = crc32(0, buf, len); |
---|
797 | |
---|
798 | dbg_readinode("Calculates CRC (%#08x) for %d bytes, csize %d\n", tn->partial_crc, len, csize); |
---|
799 | |
---|
800 | /* If we actually calculated the whole data CRC |
---|
801 | * and it is wrong, drop the node. */ |
---|
802 | if (len >= csize && unlikely(tn->partial_crc != je32_to_cpu(rd->data_crc))) { |
---|
803 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
---|
804 | ref_offset(ref), tn->partial_crc, je32_to_cpu(rd->data_crc)); |
---|
805 | jffs2_mark_node_obsolete(c, ref); |
---|
806 | goto free_out; |
---|
807 | } |
---|
808 | |
---|
809 | } else if (csize == 0) { |
---|
810 | /* |
---|
811 | * We checked the header CRC. If the node has no data, adjust |
---|
812 | * the space accounting now. For other nodes this will be done |
---|
813 | * later either when the node is marked obsolete or when its |
---|
814 | * data is checked. |
---|
815 | */ |
---|
816 | struct jffs2_eraseblock *jeb; |
---|
817 | |
---|
818 | dbg_readinode("the node has no data.\n"); |
---|
819 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
820 | len = ref_totlen(c, jeb, ref); |
---|
821 | |
---|
822 | spin_lock(&c->erase_completion_lock); |
---|
823 | jeb->used_size += len; |
---|
824 | jeb->unchecked_size -= len; |
---|
825 | c->used_size += len; |
---|
826 | c->unchecked_size -= len; |
---|
827 | ref->flash_offset = ref_offset(ref) | REF_NORMAL; |
---|
828 | spin_unlock(&c->erase_completion_lock); |
---|
829 | } |
---|
830 | } |
---|
831 | |
---|
832 | tn->fn = jffs2_alloc_full_dnode(); |
---|
833 | if (!tn->fn) { |
---|
834 | JFFS2_ERROR("alloc fn failed\n"); |
---|
835 | ret = -ENOMEM; |
---|
836 | goto free_out; |
---|
837 | } |
---|
838 | |
---|
839 | tn->version = je32_to_cpu(rd->version); |
---|
840 | tn->fn->ofs = je32_to_cpu(rd->offset); |
---|
841 | tn->data_crc = je32_to_cpu(rd->data_crc); |
---|
842 | tn->csize = csize; |
---|
843 | tn->fn->raw = ref; |
---|
844 | tn->overlapped = 0; |
---|
845 | |
---|
846 | if (tn->version > rii->highest_version) |
---|
847 | rii->highest_version = tn->version; |
---|
848 | |
---|
849 | /* There was a bug where we wrote hole nodes out with |
---|
850 | csize/dsize swapped. Deal with it */ |
---|
851 | if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && csize) |
---|
852 | tn->fn->size = csize; |
---|
853 | else // normal case... |
---|
854 | tn->fn->size = je32_to_cpu(rd->dsize); |
---|
855 | |
---|
856 | dbg_readinode2("dnode @%08x: ver %u, offset %#04x, dsize %#04x, csize %#04x\n", |
---|
857 | ref_offset(ref), je32_to_cpu(rd->version), |
---|
858 | je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize), csize); |
---|
859 | |
---|
860 | ret = jffs2_add_tn_to_tree(c, rii, tn); |
---|
861 | |
---|
862 | if (ret) { |
---|
863 | jffs2_free_full_dnode(tn->fn); |
---|
864 | free_out: |
---|
865 | jffs2_free_tmp_dnode_info(tn); |
---|
866 | return ret; |
---|
867 | } |
---|
868 | #ifdef JFFS2_DBG_READINODE2_MESSAGES |
---|
869 | dbg_readinode2("After adding ver %d:\n", je32_to_cpu(rd->version)); |
---|
870 | tn = tn_first(&rii->tn_root); |
---|
871 | while (tn) { |
---|
872 | dbg_readinode2("%p: v %d r 0x%x-0x%x ov %d\n", |
---|
873 | tn, tn->version, tn->fn->ofs, |
---|
874 | tn->fn->ofs+tn->fn->size, tn->overlapped); |
---|
875 | tn = tn_next(tn); |
---|
876 | } |
---|
877 | #endif |
---|
878 | return 0; |
---|
879 | } |
---|
880 | |
---|
881 | /* |
---|
882 | * Helper function for jffs2_get_inode_nodes(). |
---|
883 | * It is called every time an unknown node is found. |
---|
884 | * |
---|
885 | * Returns: 0 on success; |
---|
886 | * negative error code on failure. |
---|
887 | */ |
---|
888 | static inline int read_unknown(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, struct jffs2_unknown_node *un) |
---|
889 | { |
---|
890 | /* We don't mark unknown nodes as REF_UNCHECKED */ |
---|
891 | if (ref_flags(ref) == REF_UNCHECKED) { |
---|
892 | JFFS2_ERROR("REF_UNCHECKED but unknown node at %#08x\n", |
---|
893 | ref_offset(ref)); |
---|
894 | JFFS2_ERROR("Node is {%04x,%04x,%08x,%08x}. Please report this error.\n", |
---|
895 | je16_to_cpu(un->magic), je16_to_cpu(un->nodetype), |
---|
896 | je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc)); |
---|
897 | jffs2_mark_node_obsolete(c, ref); |
---|
898 | return 0; |
---|
899 | } |
---|
900 | |
---|
901 | un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype)); |
---|
902 | |
---|
903 | switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) { |
---|
904 | |
---|
905 | case JFFS2_FEATURE_INCOMPAT: |
---|
906 | JFFS2_ERROR("unknown INCOMPAT nodetype %#04X at %#08x\n", |
---|
907 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
908 | /* EEP */ |
---|
909 | BUG(); |
---|
910 | break; |
---|
911 | |
---|
912 | case JFFS2_FEATURE_ROCOMPAT: |
---|
913 | JFFS2_ERROR("unknown ROCOMPAT nodetype %#04X at %#08x\n", |
---|
914 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
915 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_RO)); |
---|
916 | break; |
---|
917 | |
---|
918 | case JFFS2_FEATURE_RWCOMPAT_COPY: |
---|
919 | JFFS2_NOTICE("unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n", |
---|
920 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
921 | break; |
---|
922 | |
---|
923 | case JFFS2_FEATURE_RWCOMPAT_DELETE: |
---|
924 | JFFS2_NOTICE("unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n", |
---|
925 | je16_to_cpu(un->nodetype), ref_offset(ref)); |
---|
926 | jffs2_mark_node_obsolete(c, ref); |
---|
927 | return 0; |
---|
928 | } |
---|
929 | |
---|
930 | return 0; |
---|
931 | } |
---|
932 | |
---|
933 | /* |
---|
934 | * Helper function for jffs2_get_inode_nodes(). |
---|
935 | * The function detects whether more data should be read and reads it if yes. |
---|
936 | * |
---|
937 | * Returns: 0 on success; |
---|
938 | * negative error code on failure. |
---|
939 | */ |
---|
940 | static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
---|
941 | int needed_len, int *rdlen, unsigned char *buf) |
---|
942 | { |
---|
943 | int err, to_read = needed_len - *rdlen; |
---|
944 | size_t retlen; |
---|
945 | uint32_t offs; |
---|
946 | |
---|
947 | if (jffs2_is_writebuffered(c)) { |
---|
948 | int rem = to_read % c->wbuf_pagesize; |
---|
949 | |
---|
950 | if (rem) |
---|
951 | to_read += c->wbuf_pagesize - rem; |
---|
952 | } |
---|
953 | |
---|
954 | /* We need to read more data */ |
---|
955 | offs = ref_offset(ref) + *rdlen; |
---|
956 | |
---|
957 | dbg_readinode("read more %d bytes\n", to_read); |
---|
958 | |
---|
959 | err = jffs2_flash_read(c, offs, to_read, &retlen, buf + *rdlen); |
---|
960 | if (err) { |
---|
961 | JFFS2_ERROR("can not read %d bytes from 0x%08x, " |
---|
962 | "error code: %d.\n", to_read, offs, err); |
---|
963 | return err; |
---|
964 | } |
---|
965 | |
---|
966 | if (retlen < to_read) { |
---|
967 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", |
---|
968 | offs, retlen, to_read); |
---|
969 | return -EIO; |
---|
970 | } |
---|
971 | |
---|
972 | *rdlen += to_read; |
---|
973 | return 0; |
---|
974 | } |
---|
975 | |
---|
976 | /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated |
---|
977 | with this ino. Perform a preliminary ordering on data nodes, throwing away |
---|
978 | those which are completely obsoleted by newer ones. The naïve approach we |
---|
979 | use to take of just returning them _all_ in version order will cause us to |
---|
980 | run out of memory in certain degenerate cases. */ |
---|
981 | static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
---|
982 | struct jffs2_readinode_info *rii) |
---|
983 | { |
---|
984 | struct jffs2_raw_node_ref *ref, *valid_ref; |
---|
985 | unsigned char *buf = NULL; |
---|
986 | union jffs2_node_union *node; |
---|
987 | size_t retlen; |
---|
988 | int len, err; |
---|
989 | |
---|
990 | rii->mctime_ver = 0; |
---|
991 | |
---|
992 | dbg_readinode("ino #%u\n", f->inocache->ino); |
---|
993 | |
---|
994 | /* FIXME: in case of NOR and available ->point() this |
---|
995 | * needs to be fixed. */ |
---|
996 | len = sizeof(union jffs2_node_union) + c->wbuf_pagesize; |
---|
997 | buf = kmalloc(len, GFP_KERNEL); |
---|
998 | if (!buf) |
---|
999 | return -ENOMEM; |
---|
1000 | |
---|
1001 | spin_lock(&c->erase_completion_lock); |
---|
1002 | valid_ref = jffs2_first_valid_node(f->inocache->nodes); |
---|
1003 | if (!valid_ref && f->inocache->ino != 1) |
---|
1004 | JFFS2_WARNING("Eep. No valid nodes for ino #%u.\n", f->inocache->ino); |
---|
1005 | while (valid_ref) { |
---|
1006 | /* We can hold a pointer to a non-obsolete node without the spinlock, |
---|
1007 | but _obsolete_ nodes may disappear at any time, if the block |
---|
1008 | they're in gets erased. So if we mark 'ref' obsolete while we're |
---|
1009 | not holding the lock, it can go away immediately. For that reason, |
---|
1010 | we find the next valid node first, before processing 'ref'. |
---|
1011 | */ |
---|
1012 | ref = valid_ref; |
---|
1013 | valid_ref = jffs2_first_valid_node(ref->next_in_ino); |
---|
1014 | spin_unlock(&c->erase_completion_lock); |
---|
1015 | |
---|
1016 | cond_resched(); |
---|
1017 | |
---|
1018 | /* |
---|
1019 | * At this point we don't know the type of the node we're going |
---|
1020 | * to read, so we do not know the size of its header. In order |
---|
1021 | * to minimize the amount of flash IO we assume the header is |
---|
1022 | * of size = JFFS2_MIN_NODE_HEADER. |
---|
1023 | */ |
---|
1024 | len = JFFS2_MIN_NODE_HEADER; |
---|
1025 | if (jffs2_is_writebuffered(c)) { |
---|
1026 | int end, rem; |
---|
1027 | |
---|
1028 | /* |
---|
1029 | * We are about to read JFFS2_MIN_NODE_HEADER bytes, |
---|
1030 | * but this flash has some minimal I/O unit. It is |
---|
1031 | * possible that we'll need to read more soon, so read |
---|
1032 | * up to the next min. I/O unit, in order not to |
---|
1033 | * re-read the same min. I/O unit twice. |
---|
1034 | */ |
---|
1035 | end = ref_offset(ref) + len; |
---|
1036 | rem = end % c->wbuf_pagesize; |
---|
1037 | if (rem) |
---|
1038 | end += c->wbuf_pagesize - rem; |
---|
1039 | len = end - ref_offset(ref); |
---|
1040 | } |
---|
1041 | |
---|
1042 | dbg_readinode("read %d bytes at %#08x(%d).\n", len, ref_offset(ref), ref_flags(ref)); |
---|
1043 | |
---|
1044 | /* FIXME: point() */ |
---|
1045 | err = jffs2_flash_read(c, ref_offset(ref), len, &retlen, buf); |
---|
1046 | if (err) { |
---|
1047 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ref_offset(ref), err); |
---|
1048 | goto free_out; |
---|
1049 | } |
---|
1050 | |
---|
1051 | if (retlen < len) { |
---|
1052 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", ref_offset(ref), retlen, len); |
---|
1053 | err = -EIO; |
---|
1054 | goto free_out; |
---|
1055 | } |
---|
1056 | |
---|
1057 | node = (union jffs2_node_union *)buf; |
---|
1058 | |
---|
1059 | /* No need to mask in the valid bit; it shouldn't be invalid */ |
---|
1060 | if (je32_to_cpu(node->u.hdr_crc) != crc32(0, node, sizeof(node->u)-4)) { |
---|
1061 | JFFS2_NOTICE("Node header CRC failed at %#08x. {%04x,%04x,%08x,%08x}\n", |
---|
1062 | ref_offset(ref), je16_to_cpu(node->u.magic), |
---|
1063 | je16_to_cpu(node->u.nodetype), |
---|
1064 | je32_to_cpu(node->u.totlen), |
---|
1065 | je32_to_cpu(node->u.hdr_crc)); |
---|
1066 | jffs2_dbg_dump_node(c, ref_offset(ref)); |
---|
1067 | jffs2_mark_node_obsolete(c, ref); |
---|
1068 | goto cont; |
---|
1069 | } |
---|
1070 | if (je16_to_cpu(node->u.magic) != JFFS2_MAGIC_BITMASK) { |
---|
1071 | /* Not a JFFS2 node, whinge and move on */ |
---|
1072 | JFFS2_NOTICE("Wrong magic bitmask 0x%04x in node header at %#08x.\n", |
---|
1073 | je16_to_cpu(node->u.magic), ref_offset(ref)); |
---|
1074 | jffs2_mark_node_obsolete(c, ref); |
---|
1075 | goto cont; |
---|
1076 | } |
---|
1077 | |
---|
1078 | switch (je16_to_cpu(node->u.nodetype)) { |
---|
1079 | |
---|
1080 | case JFFS2_NODETYPE_DIRENT: |
---|
1081 | |
---|
1082 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent) && |
---|
1083 | len < sizeof(struct jffs2_raw_dirent)) { |
---|
1084 | err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf); |
---|
1085 | if (unlikely(err)) |
---|
1086 | goto free_out; |
---|
1087 | } |
---|
1088 | |
---|
1089 | err = read_direntry(c, ref, &node->d, retlen, rii); |
---|
1090 | if (unlikely(err)) |
---|
1091 | goto free_out; |
---|
1092 | |
---|
1093 | break; |
---|
1094 | |
---|
1095 | case JFFS2_NODETYPE_INODE: |
---|
1096 | |
---|
1097 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode) && |
---|
1098 | len < sizeof(struct jffs2_raw_inode)) { |
---|
1099 | err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf); |
---|
1100 | if (unlikely(err)) |
---|
1101 | goto free_out; |
---|
1102 | } |
---|
1103 | |
---|
1104 | err = read_dnode(c, ref, &node->i, len, rii); |
---|
1105 | if (unlikely(err)) |
---|
1106 | goto free_out; |
---|
1107 | |
---|
1108 | break; |
---|
1109 | |
---|
1110 | default: |
---|
1111 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node) && |
---|
1112 | len < sizeof(struct jffs2_unknown_node)) { |
---|
1113 | err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf); |
---|
1114 | if (unlikely(err)) |
---|
1115 | goto free_out; |
---|
1116 | } |
---|
1117 | |
---|
1118 | err = read_unknown(c, ref, &node->u); |
---|
1119 | if (unlikely(err)) |
---|
1120 | goto free_out; |
---|
1121 | |
---|
1122 | } |
---|
1123 | cont: |
---|
1124 | spin_lock(&c->erase_completion_lock); |
---|
1125 | } |
---|
1126 | |
---|
1127 | spin_unlock(&c->erase_completion_lock); |
---|
1128 | kfree(buf); |
---|
1129 | |
---|
1130 | f->highest_version = rii->highest_version; |
---|
1131 | |
---|
1132 | dbg_readinode("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n", |
---|
1133 | f->inocache->ino, rii->highest_version, rii->latest_mctime, |
---|
1134 | rii->mctime_ver); |
---|
1135 | return 0; |
---|
1136 | |
---|
1137 | free_out: |
---|
1138 | jffs2_free_tmp_dnode_info_list(&rii->tn_root); |
---|
1139 | jffs2_free_full_dirent_list(rii->fds); |
---|
1140 | rii->fds = NULL; |
---|
1141 | kfree(buf); |
---|
1142 | return err; |
---|
1143 | } |
---|
1144 | |
---|
1145 | static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, |
---|
1146 | struct jffs2_inode_info *f, |
---|
1147 | struct jffs2_raw_inode *latest_node) |
---|
1148 | { |
---|
1149 | struct jffs2_readinode_info rii; |
---|
1150 | uint32_t crc, new_size; |
---|
1151 | size_t retlen; |
---|
1152 | int ret; |
---|
1153 | |
---|
1154 | dbg_readinode("ino #%u pino/nlink is %d\n", f->inocache->ino, |
---|
1155 | f->inocache->pino_nlink); |
---|
1156 | |
---|
1157 | memset(&rii, 0, sizeof(rii)); |
---|
1158 | |
---|
1159 | /* Grab all nodes relevant to this ino */ |
---|
1160 | ret = jffs2_get_inode_nodes(c, f, &rii); |
---|
1161 | |
---|
1162 | if (ret) { |
---|
1163 | JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); |
---|
1164 | if (f->inocache->state == INO_STATE_READING) |
---|
1165 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1166 | return ret; |
---|
1167 | } |
---|
1168 | |
---|
1169 | ret = jffs2_build_inode_fragtree(c, f, &rii); |
---|
1170 | if (ret) { |
---|
1171 | JFFS2_ERROR("Failed to build final fragtree for inode #%u: error %d\n", |
---|
1172 | f->inocache->ino, ret); |
---|
1173 | if (f->inocache->state == INO_STATE_READING) |
---|
1174 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1175 | jffs2_free_tmp_dnode_info_list(&rii.tn_root); |
---|
1176 | /* FIXME: We could at least crc-check them all */ |
---|
1177 | if (rii.mdata_tn) { |
---|
1178 | jffs2_free_full_dnode(rii.mdata_tn->fn); |
---|
1179 | jffs2_free_tmp_dnode_info(rii.mdata_tn); |
---|
1180 | rii.mdata_tn = NULL; |
---|
1181 | } |
---|
1182 | return ret; |
---|
1183 | } |
---|
1184 | |
---|
1185 | if (rii.mdata_tn) { |
---|
1186 | if (rii.mdata_tn->fn->raw == rii.latest_ref) { |
---|
1187 | f->metadata = rii.mdata_tn->fn; |
---|
1188 | jffs2_free_tmp_dnode_info(rii.mdata_tn); |
---|
1189 | } else { |
---|
1190 | jffs2_kill_tn(c, rii.mdata_tn); |
---|
1191 | } |
---|
1192 | rii.mdata_tn = NULL; |
---|
1193 | } |
---|
1194 | |
---|
1195 | f->dents = rii.fds; |
---|
1196 | |
---|
1197 | jffs2_dbg_fragtree_paranoia_check_nolock(f); |
---|
1198 | |
---|
1199 | if (unlikely(!rii.latest_ref)) { |
---|
1200 | /* No data nodes for this inode. */ |
---|
1201 | if (f->inocache->ino != 1) { |
---|
1202 | JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); |
---|
1203 | if (!rii.fds) { |
---|
1204 | if (f->inocache->state == INO_STATE_READING) |
---|
1205 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1206 | return -EIO; |
---|
1207 | } |
---|
1208 | JFFS2_NOTICE("but it has children so we fake some modes for it\n"); |
---|
1209 | } |
---|
1210 | latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); |
---|
1211 | latest_node->version = cpu_to_je32(0); |
---|
1212 | latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); |
---|
1213 | latest_node->isize = cpu_to_je32(0); |
---|
1214 | latest_node->gid = cpu_to_je16(0); |
---|
1215 | latest_node->uid = cpu_to_je16(0); |
---|
1216 | if (f->inocache->state == INO_STATE_READING) |
---|
1217 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
---|
1218 | return 0; |
---|
1219 | } |
---|
1220 | |
---|
1221 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref), sizeof(*latest_node), &retlen, (void *)latest_node); |
---|
1222 | if (ret || retlen != sizeof(*latest_node)) { |
---|
1223 | JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", |
---|
1224 | ret, retlen, sizeof(*latest_node)); |
---|
1225 | /* FIXME: If this fails, there seems to be a memory leak. Find it. */ |
---|
1226 | mutex_unlock(&f->sem); |
---|
1227 | jffs2_do_clear_inode(c, f); |
---|
1228 | return ret?ret:-EIO; |
---|
1229 | } |
---|
1230 | |
---|
1231 | crc = crc32(0, latest_node, sizeof(*latest_node)-8); |
---|
1232 | if (crc != je32_to_cpu(latest_node->node_crc)) { |
---|
1233 | JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", |
---|
1234 | f->inocache->ino, ref_offset(rii.latest_ref)); |
---|
1235 | mutex_unlock(&f->sem); |
---|
1236 | jffs2_do_clear_inode(c, f); |
---|
1237 | return -EIO; |
---|
1238 | } |
---|
1239 | |
---|
1240 | switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { |
---|
1241 | case S_IFDIR: |
---|
1242 | if (rii.mctime_ver > je32_to_cpu(latest_node->version)) { |
---|
1243 | /* The times in the latest_node are actually older than |
---|
1244 | mctime in the latest dirent. Cheat. */ |
---|
1245 | latest_node->ctime = latest_node->mtime = cpu_to_je32(rii.latest_mctime); |
---|
1246 | } |
---|
1247 | break; |
---|
1248 | |
---|
1249 | |
---|
1250 | case S_IFREG: |
---|
1251 | /* If it was a regular file, truncate it to the latest node's isize */ |
---|
1252 | new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); |
---|
1253 | if (new_size != je32_to_cpu(latest_node->isize)) { |
---|
1254 | JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n", |
---|
1255 | f->inocache->ino, je32_to_cpu(latest_node->isize), new_size); |
---|
1256 | latest_node->isize = cpu_to_je32(new_size); |
---|
1257 | } |
---|
1258 | break; |
---|
1259 | |
---|
1260 | case S_IFLNK: |
---|
1261 | /* Hack to work around broken isize in old symlink code. |
---|
1262 | Remove this when dwmw2 comes to his senses and stops |
---|
1263 | symlinks from being an entirely gratuitous special |
---|
1264 | case. */ |
---|
1265 | if (!je32_to_cpu(latest_node->isize)) |
---|
1266 | latest_node->isize = latest_node->dsize; |
---|
1267 | |
---|
1268 | if (f->inocache->state != INO_STATE_CHECKING) { |
---|
1269 | /* Symlink's inode data is the target path. Read it and |
---|
1270 | * keep in RAM to facilitate quick follow symlink |
---|
1271 | * operation. */ |
---|
1272 | uint32_t csize = je32_to_cpu(latest_node->csize); |
---|
1273 | if (csize > JFFS2_MAX_NAME_LEN) { |
---|
1274 | mutex_unlock(&f->sem); |
---|
1275 | jffs2_do_clear_inode(c, f); |
---|
1276 | return -ENAMETOOLONG; |
---|
1277 | } |
---|
1278 | f->target = kmalloc(csize + 1, GFP_KERNEL); |
---|
1279 | if (!f->target) { |
---|
1280 | JFFS2_ERROR("can't allocate %u bytes of memory for the symlink target path cache\n", csize); |
---|
1281 | mutex_unlock(&f->sem); |
---|
1282 | jffs2_do_clear_inode(c, f); |
---|
1283 | return -ENOMEM; |
---|
1284 | } |
---|
1285 | |
---|
1286 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref) + sizeof(*latest_node), |
---|
1287 | csize, &retlen, (char *)f->target); |
---|
1288 | |
---|
1289 | if (ret || retlen != csize) { |
---|
1290 | if (retlen != csize) |
---|
1291 | ret = -EIO; |
---|
1292 | kfree(f->target); |
---|
1293 | f->target = NULL; |
---|
1294 | mutex_unlock(&f->sem); |
---|
1295 | jffs2_do_clear_inode(c, f); |
---|
1296 | return ret; |
---|
1297 | } |
---|
1298 | |
---|
1299 | f->target[csize] = '\0'; |
---|
1300 | dbg_readinode("symlink's target '%s' cached\n", f->target); |
---|
1301 | } |
---|
1302 | |
---|
1303 | /* fall through... */ |
---|
1304 | |
---|
1305 | case S_IFBLK: |
---|
1306 | case S_IFCHR: |
---|
1307 | /* Certain inode types should have only one data node, and it's |
---|
1308 | kept as the metadata node */ |
---|
1309 | if (f->metadata) { |
---|
1310 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", |
---|
1311 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1312 | mutex_unlock(&f->sem); |
---|
1313 | jffs2_do_clear_inode(c, f); |
---|
1314 | return -EIO; |
---|
1315 | } |
---|
1316 | if (!frag_first(&f->fragtree)) { |
---|
1317 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", |
---|
1318 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1319 | mutex_unlock(&f->sem); |
---|
1320 | jffs2_do_clear_inode(c, f); |
---|
1321 | return -EIO; |
---|
1322 | } |
---|
1323 | /* ASSERT: f->fraglist != NULL */ |
---|
1324 | if (frag_next(frag_first(&f->fragtree))) { |
---|
1325 | JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", |
---|
1326 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
---|
1327 | /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ |
---|
1328 | mutex_unlock(&f->sem); |
---|
1329 | jffs2_do_clear_inode(c, f); |
---|
1330 | return -EIO; |
---|
1331 | } |
---|
1332 | /* OK. We're happy */ |
---|
1333 | f->metadata = frag_first(&f->fragtree)->node; |
---|
1334 | jffs2_free_node_frag(frag_first(&f->fragtree)); |
---|
1335 | f->fragtree = RB_ROOT; |
---|
1336 | break; |
---|
1337 | } |
---|
1338 | if (f->inocache->state == INO_STATE_READING) |
---|
1339 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
---|
1340 | |
---|
1341 | return 0; |
---|
1342 | } |
---|
1343 | |
---|
1344 | /* Scan the list of all nodes present for this ino, build map of versions, etc. */ |
---|
1345 | int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
---|
1346 | uint32_t ino, struct jffs2_raw_inode *latest_node) |
---|
1347 | { |
---|
1348 | dbg_readinode("read inode #%u\n", ino); |
---|
1349 | |
---|
1350 | retry_inocache: |
---|
1351 | spin_lock(&c->inocache_lock); |
---|
1352 | f->inocache = jffs2_get_ino_cache(c, ino); |
---|
1353 | |
---|
1354 | if (f->inocache) { |
---|
1355 | /* Check its state. We may need to wait before we can use it */ |
---|
1356 | switch(f->inocache->state) { |
---|
1357 | case INO_STATE_UNCHECKED: |
---|
1358 | case INO_STATE_CHECKEDABSENT: |
---|
1359 | f->inocache->state = INO_STATE_READING; |
---|
1360 | break; |
---|
1361 | |
---|
1362 | case INO_STATE_CHECKING: |
---|
1363 | case INO_STATE_GC: |
---|
1364 | /* If it's in either of these states, we need |
---|
1365 | to wait for whoever's got it to finish and |
---|
1366 | put it back. */ |
---|
1367 | dbg_readinode("waiting for ino #%u in state %d\n", ino, f->inocache->state); |
---|
1368 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
---|
1369 | goto retry_inocache; |
---|
1370 | |
---|
1371 | case INO_STATE_READING: |
---|
1372 | case INO_STATE_PRESENT: |
---|
1373 | /* Eep. This should never happen. It can |
---|
1374 | happen if Linux calls read_inode() again |
---|
1375 | before clear_inode() has finished though. */ |
---|
1376 | JFFS2_ERROR("Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state); |
---|
1377 | /* Fail. That's probably better than allowing it to succeed */ |
---|
1378 | f->inocache = NULL; |
---|
1379 | break; |
---|
1380 | |
---|
1381 | default: |
---|
1382 | BUG(); |
---|
1383 | } |
---|
1384 | } |
---|
1385 | spin_unlock(&c->inocache_lock); |
---|
1386 | |
---|
1387 | if (!f->inocache && ino == 1) { |
---|
1388 | /* Special case - no root inode on medium */ |
---|
1389 | f->inocache = jffs2_alloc_inode_cache(); |
---|
1390 | if (!f->inocache) { |
---|
1391 | JFFS2_ERROR("cannot allocate inocache for root inode\n"); |
---|
1392 | return -ENOMEM; |
---|
1393 | } |
---|
1394 | dbg_readinode("creating inocache for root inode\n"); |
---|
1395 | memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); |
---|
1396 | f->inocache->ino = f->inocache->pino_nlink = 1; |
---|
1397 | f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; |
---|
1398 | f->inocache->state = INO_STATE_READING; |
---|
1399 | jffs2_add_ino_cache(c, f->inocache); |
---|
1400 | } |
---|
1401 | if (!f->inocache) { |
---|
1402 | JFFS2_ERROR("requestied to read an nonexistent ino %u\n", ino); |
---|
1403 | return -ENOENT; |
---|
1404 | } |
---|
1405 | |
---|
1406 | return jffs2_do_read_inode_internal(c, f, latest_node); |
---|
1407 | } |
---|
1408 | |
---|
1409 | int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
---|
1410 | { |
---|
1411 | struct jffs2_raw_inode n; |
---|
1412 | struct jffs2_inode_info *f = kzalloc(sizeof(*f), GFP_KERNEL); |
---|
1413 | int ret; |
---|
1414 | |
---|
1415 | if (!f) |
---|
1416 | return -ENOMEM; |
---|
1417 | |
---|
1418 | mutex_init(&f->sem); |
---|
1419 | mutex_lock(&f->sem); |
---|
1420 | f->inocache = ic; |
---|
1421 | |
---|
1422 | ret = jffs2_do_read_inode_internal(c, f, &n); |
---|
1423 | if (!ret) { |
---|
1424 | mutex_unlock(&f->sem); |
---|
1425 | jffs2_do_clear_inode(c, f); |
---|
1426 | } |
---|
1427 | jffs2_xattr_do_crccheck_inode(c, ic); |
---|
1428 | kfree (f); |
---|
1429 | return ret; |
---|
1430 | } |
---|
1431 | |
---|
1432 | void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f) |
---|
1433 | { |
---|
1434 | struct jffs2_full_dirent *fd, *fds; |
---|
1435 | int deleted; |
---|
1436 | |
---|
1437 | jffs2_xattr_delete_inode(c, f->inocache); |
---|
1438 | mutex_lock(&f->sem); |
---|
1439 | deleted = f->inocache && !f->inocache->pino_nlink; |
---|
1440 | |
---|
1441 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) |
---|
1442 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CLEARING); |
---|
1443 | |
---|
1444 | if (f->metadata) { |
---|
1445 | if (deleted) |
---|
1446 | jffs2_mark_node_obsolete(c, f->metadata->raw); |
---|
1447 | jffs2_free_full_dnode(f->metadata); |
---|
1448 | } |
---|
1449 | |
---|
1450 | jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL); |
---|
1451 | |
---|
1452 | if (f->target) { |
---|
1453 | kfree(f->target); |
---|
1454 | f->target = NULL; |
---|
1455 | } |
---|
1456 | |
---|
1457 | fds = f->dents; |
---|
1458 | while(fds) { |
---|
1459 | fd = fds; |
---|
1460 | fds = fd->next; |
---|
1461 | jffs2_free_full_dirent(fd); |
---|
1462 | } |
---|
1463 | |
---|
1464 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) { |
---|
1465 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
---|
1466 | if (f->inocache->nodes == (void *)f->inocache) |
---|
1467 | jffs2_del_ino_cache(c, f->inocache); |
---|
1468 | } |
---|
1469 | |
---|
1470 | mutex_unlock(&f->sem); |
---|
1471 | } |
---|