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 © 2001-2003 Free Software Foundation, Inc. |
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7 | * Copyright © 2001-2007 Red Hat, Inc. |
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8 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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9 | * Copyright © 2013 embedded brains GmbH <rtems@embedded-brains.de> |
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10 | * |
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11 | * Created by David Woodhouse <dwmw2@cambridge.redhat.com> |
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12 | * |
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13 | * Port to the RTEMS by embedded brains GmbH. |
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14 | * |
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15 | * For licensing information, see the file 'LICENCE' in this directory. |
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16 | * |
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17 | * $Id: dir-ecos.c,v 1.11 2005/02/08 19:36:27 lunn Exp $ |
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18 | * |
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19 | */ |
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20 | |
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21 | #include <linux/kernel.h> |
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22 | #include <linux/crc32.h> |
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23 | #include "nodelist.h" |
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24 | |
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25 | /***********************************************************************/ |
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26 | |
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27 | /* Takes length argument because it can be either NUL-terminated or '/'-terminated */ |
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28 | struct _inode *jffs2_lookup(struct _inode *dir_i, const unsigned char *name, size_t namelen) |
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29 | { |
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30 | struct jffs2_inode_info *dir_f; |
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31 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
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32 | uint32_t ino = 0; |
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33 | uint32_t hash = full_name_hash(name, namelen); |
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34 | struct _inode *inode = NULL; |
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35 | |
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36 | D1(printk("jffs2_lookup()\n")); |
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37 | |
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38 | dir_f = JFFS2_INODE_INFO(dir_i); |
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39 | |
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40 | mutex_lock(&dir_f->sem); |
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41 | |
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42 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ |
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43 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= hash; fd_list = fd_list->next) { |
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44 | if (fd_list->nhash == hash && |
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45 | (!fd || fd_list->version > fd->version) && |
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46 | strlen((char *)fd_list->name) == namelen && |
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47 | !strncmp((char *)fd_list->name, (char *)name, namelen)) { |
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48 | fd = fd_list; |
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49 | } |
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50 | } |
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51 | if (fd) |
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52 | ino = fd->ino; |
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53 | mutex_unlock(&dir_f->sem); |
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54 | if (ino) { |
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55 | inode = jffs2_iget(dir_i->i_sb, ino); |
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56 | if (IS_ERR(inode)) { |
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57 | printk("jffs2_iget() failed for ino #%lu\n", ino); |
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58 | return inode; |
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59 | } else { |
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60 | inode->i_fd = fd; |
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61 | } |
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62 | } |
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63 | |
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64 | return inode; |
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65 | } |
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66 | |
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67 | /***********************************************************************/ |
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68 | |
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69 | |
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70 | |
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71 | int jffs2_create(struct _inode *dir_i, const char *d_name, size_t d_namelen, int mode) |
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72 | { |
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73 | struct jffs2_raw_inode *ri; |
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74 | struct jffs2_inode_info *f, *dir_f; |
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75 | struct jffs2_sb_info *c; |
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76 | struct _inode *inode; |
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77 | int ret; |
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78 | struct qstr qstr; |
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79 | |
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80 | qstr.name = d_name; |
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81 | qstr.len = d_namelen; |
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82 | |
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83 | ri = jffs2_alloc_raw_inode(); |
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84 | if (!ri) |
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85 | return -ENOMEM; |
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86 | |
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87 | c = JFFS2_SB_INFO(dir_i->i_sb); |
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88 | |
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89 | D1(printk(KERN_DEBUG "jffs2_create()\n")); |
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90 | |
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91 | inode = jffs2_new_inode(dir_i, mode, ri); |
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92 | |
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93 | if (IS_ERR(inode)) { |
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94 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); |
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95 | jffs2_free_raw_inode(ri); |
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96 | return PTR_ERR(inode); |
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97 | } |
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98 | |
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99 | f = JFFS2_INODE_INFO(inode); |
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100 | dir_f = JFFS2_INODE_INFO(dir_i); |
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101 | |
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102 | ret = jffs2_do_create(c, dir_f, f, ri, &qstr); |
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103 | |
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104 | if (ret) { |
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105 | inode->i_nlink = 0; |
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106 | jffs2_iput(inode); |
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107 | jffs2_free_raw_inode(ri); |
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108 | return ret; |
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109 | } |
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110 | |
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111 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
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112 | |
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113 | jffs2_free_raw_inode(ri); |
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114 | |
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115 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d)\n", |
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116 | inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->pino_nlink)); |
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117 | jffs2_iput(inode); |
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118 | return 0; |
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119 | } |
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120 | |
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121 | /***********************************************************************/ |
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122 | |
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123 | |
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124 | int jffs2_unlink(struct _inode *dir_i, struct _inode *d_inode, const unsigned char *d_name, size_t d_namelen) |
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125 | { |
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126 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
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127 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
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128 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode); |
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129 | int ret; |
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130 | |
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131 | ret = jffs2_do_unlink(c, dir_f, (const char *)d_name, |
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132 | d_namelen, dead_f, get_seconds()); |
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133 | if (dead_f->inocache) |
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134 | d_inode->i_nlink = dead_f->inocache->pino_nlink; |
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135 | return ret; |
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136 | } |
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137 | /***********************************************************************/ |
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138 | |
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139 | |
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140 | int jffs2_link (struct _inode *old_d_inode, struct _inode *dir_i, const unsigned char *d_name, size_t d_namelen) |
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141 | { |
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142 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_d_inode->i_sb); |
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143 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_d_inode); |
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144 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
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145 | int ret; |
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146 | |
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147 | /* XXX: This is ugly */ |
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148 | uint8_t type = (old_d_inode->i_mode & S_IFMT) >> 12; |
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149 | if (!type) type = DT_REG; |
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150 | |
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151 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, |
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152 | (const char * )d_name, |
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153 | d_namelen, get_seconds()); |
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154 | |
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155 | if (!ret) { |
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156 | mutex_lock(&f->sem); |
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157 | old_d_inode->i_nlink = ++f->inocache->pino_nlink; |
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158 | mutex_unlock(&f->sem); |
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159 | } |
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160 | return ret; |
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161 | } |
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162 | |
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163 | /***********************************************************************/ |
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164 | |
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165 | int jffs2_mknod( |
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166 | struct _inode *dir_i, |
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167 | const unsigned char *d_name, |
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168 | size_t d_namelen, |
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169 | int mode, |
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170 | const unsigned char *data, |
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171 | size_t datalen |
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172 | ) |
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173 | { |
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174 | struct jffs2_inode_info *f, *dir_f; |
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175 | struct jffs2_sb_info *c; |
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176 | struct _inode *inode; |
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177 | struct jffs2_raw_inode *ri; |
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178 | struct jffs2_raw_dirent *rd; |
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179 | struct jffs2_full_dnode *fn; |
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180 | struct jffs2_full_dirent *fd; |
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181 | uint32_t alloclen; |
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182 | int ret; |
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183 | |
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184 | /* FIXME: If you care. We'd need to use frags for the data |
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185 | if it grows much more than this */ |
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186 | if (datalen > 254) |
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187 | return -ENAMETOOLONG; |
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188 | |
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189 | ri = jffs2_alloc_raw_inode(); |
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190 | |
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191 | if (!ri) |
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192 | return -ENOMEM; |
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193 | |
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194 | c = JFFS2_SB_INFO(dir_i->i_sb); |
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195 | |
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196 | /* Try to reserve enough space for both node and dirent. |
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197 | * Just the node will do for now, though |
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198 | */ |
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199 | ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &alloclen, |
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200 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
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201 | |
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202 | if (ret) { |
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203 | jffs2_free_raw_inode(ri); |
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204 | return ret; |
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205 | } |
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206 | |
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207 | inode = jffs2_new_inode(dir_i, mode, ri); |
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208 | |
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209 | if (IS_ERR(inode)) { |
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210 | jffs2_free_raw_inode(ri); |
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211 | jffs2_complete_reservation(c); |
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212 | return PTR_ERR(inode); |
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213 | } |
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214 | |
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215 | f = JFFS2_INODE_INFO(inode); |
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216 | |
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217 | inode->i_size = datalen; |
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218 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
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219 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); |
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220 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
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221 | |
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222 | ri->compr = JFFS2_COMPR_NONE; |
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223 | ri->data_crc = cpu_to_je32(crc32(0, data, datalen)); |
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224 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
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225 | |
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226 | fn = jffs2_write_dnode(c, f, ri, data, datalen, ALLOC_NORMAL); |
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227 | |
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228 | jffs2_free_raw_inode(ri); |
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229 | |
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230 | if (IS_ERR(fn)) { |
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231 | /* Eeek. Wave bye bye */ |
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232 | mutex_unlock(&f->sem); |
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233 | jffs2_complete_reservation(c); |
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234 | ret = PTR_ERR(fn); |
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235 | goto fail; |
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236 | } |
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237 | |
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238 | if (S_ISLNK(mode)) { |
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239 | /* We use f->target field to store the target path. */ |
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240 | f->target = kmemdup(data, datalen + 1, GFP_KERNEL); |
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241 | if (!f->target) { |
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242 | pr_warn("Can't allocate %d bytes of memory\n", datalen + 1); |
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243 | mutex_unlock(&f->sem); |
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244 | jffs2_complete_reservation(c); |
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245 | ret = -ENOMEM; |
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246 | goto fail; |
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247 | } |
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248 | |
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249 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
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250 | __func__, (char *)f->target); |
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251 | } |
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252 | |
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253 | /* No data here. Only a metadata node, which will be |
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254 | obsoleted by the first data write |
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255 | */ |
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256 | f->metadata = fn; |
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257 | mutex_unlock(&f->sem); |
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258 | |
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259 | jffs2_complete_reservation(c); |
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260 | |
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261 | ret = jffs2_reserve_space(c, sizeof(*rd)+d_namelen, &alloclen, |
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262 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(d_namelen)); |
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263 | if (ret) |
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264 | goto fail; |
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265 | |
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266 | rd = jffs2_alloc_raw_dirent(); |
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267 | if (!rd) { |
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268 | /* Argh. Now we treat it like a normal delete */ |
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269 | jffs2_complete_reservation(c); |
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270 | ret = -ENOMEM; |
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271 | goto fail; |
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272 | } |
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273 | |
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274 | dir_f = JFFS2_INODE_INFO(dir_i); |
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275 | mutex_lock(&dir_f->sem); |
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276 | |
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277 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
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278 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
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279 | rd->totlen = cpu_to_je32(sizeof(*rd) + d_namelen); |
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280 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
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281 | |
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282 | rd->pino = cpu_to_je32(dir_i->i_ino); |
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283 | rd->version = cpu_to_je32(++dir_f->highest_version); |
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284 | rd->ino = cpu_to_je32(inode->i_ino); |
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285 | rd->mctime = cpu_to_je32(get_seconds()); |
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286 | rd->nsize = d_namelen; |
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287 | |
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288 | /* XXX: This is ugly. */ |
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289 | rd->type = (mode & S_IFMT) >> 12; |
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290 | |
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291 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
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292 | rd->name_crc = cpu_to_je32(crc32(0, d_name, d_namelen)); |
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293 | |
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294 | fd = jffs2_write_dirent(c, dir_f, rd, d_name, d_namelen, ALLOC_NORMAL); |
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295 | |
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296 | if (IS_ERR(fd)) { |
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297 | /* dirent failed to write. Delete the inode normally |
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298 | as if it were the final unlink() */ |
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299 | jffs2_complete_reservation(c); |
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300 | jffs2_free_raw_dirent(rd); |
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301 | mutex_unlock(&dir_f->sem); |
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302 | ret = PTR_ERR(fd); |
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303 | goto fail; |
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304 | } |
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305 | |
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306 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
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307 | |
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308 | jffs2_free_raw_dirent(rd); |
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309 | |
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310 | /* Link the fd into the inode's list, obsoleting an old |
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311 | one if necessary. */ |
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312 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
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313 | |
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314 | mutex_unlock(&dir_f->sem); |
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315 | jffs2_complete_reservation(c); |
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316 | |
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317 | fail: |
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318 | jffs2_iput(inode); |
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319 | |
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320 | return ret; |
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321 | } |
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322 | |
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323 | int jffs2_rmdir (struct _inode *dir_i, struct _inode *d_inode, const unsigned char *d_name, size_t d_namelen) |
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324 | { |
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325 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode); |
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326 | struct jffs2_full_dirent *fd; |
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327 | |
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328 | for (fd = f->dents ; fd; fd = fd->next) { |
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329 | if (fd->ino) |
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330 | return -ENOTEMPTY; |
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331 | } |
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332 | return jffs2_unlink(dir_i, d_inode, d_name, d_namelen); |
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333 | } |
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334 | |
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335 | int jffs2_rename (struct _inode *old_dir_i, struct _inode *d_inode, const unsigned char *old_d_name, size_t old_d_namelen, |
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336 | struct _inode *new_dir_i, const unsigned char *new_d_name, size_t new_d_namelen) |
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337 | { |
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338 | int ret; |
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339 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); |
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340 | struct jffs2_inode_info *victim_f = NULL; |
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341 | uint8_t type; |
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342 | uint32_t now; |
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343 | |
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344 | #if 0 /* FIXME -- this really doesn't belong in individual file systems. |
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345 | The fileio code ought to do this for us, or at least part of it */ |
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346 | if (new_dentry->d_inode) { |
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347 | if (S_ISDIR(d_inode->i_mode) && |
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348 | !S_ISDIR(new_dentry->d_inode->i_mode)) { |
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349 | /* Cannot rename directory over non-directory */ |
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350 | return -EINVAL; |
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351 | } |
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352 | |
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353 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); |
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354 | |
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355 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { |
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356 | struct jffs2_full_dirent *fd; |
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357 | |
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358 | if (!S_ISDIR(d_inode->i_mode)) { |
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359 | /* Cannot rename non-directory over directory */ |
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360 | return -EINVAL; |
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361 | } |
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362 | mutex_lock(&victim_f->sem); |
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363 | for (fd = victim_f->dents; fd; fd = fd->next) { |
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364 | if (fd->ino) { |
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365 | mutex_unlock(&victim_f->sem); |
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366 | return -ENOTEMPTY; |
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367 | } |
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368 | } |
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369 | mutex_unlock(&victim_f->sem); |
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370 | } |
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371 | } |
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372 | #endif |
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373 | |
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374 | /* XXX: We probably ought to alloc enough space for |
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375 | both nodes at the same time. Writing the new link, |
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376 | then getting -ENOSPC, is quite bad :) |
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377 | */ |
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378 | |
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379 | /* Make a hard link */ |
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380 | |
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381 | /* XXX: This is ugly */ |
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382 | type = (d_inode->i_mode & S_IFMT) >> 12; |
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383 | if (!type) type = DT_REG; |
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384 | |
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385 | now = get_seconds(); |
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386 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
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387 | d_inode->i_ino, type, |
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388 | (const char *)new_d_name, |
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389 | new_d_namelen, now); |
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390 | |
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391 | if (ret) |
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392 | return ret; |
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393 | |
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394 | if (victim_f) { |
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395 | /* There was a victim. Kill it off nicely */ |
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396 | /* Don't oops if the victim was a dirent pointing to an |
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397 | inode which didn't exist. */ |
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398 | if (victim_f->inocache) { |
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399 | mutex_lock(&victim_f->sem); |
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400 | victim_f->inocache->pino_nlink--; |
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401 | mutex_unlock(&victim_f->sem); |
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402 | } |
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403 | } |
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404 | |
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405 | /* Unlink the original */ |
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406 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
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407 | (const char *)old_d_name, |
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408 | old_d_namelen, NULL, now); |
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409 | |
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410 | if (ret) { |
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411 | /* Oh shit. We really ought to make a single node which can do both atomically */ |
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412 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode); |
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413 | mutex_lock(&f->sem); |
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414 | if (f->inocache) |
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415 | d_inode->i_nlink = f->inocache->pino_nlink++; |
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416 | mutex_unlock(&f->sem); |
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417 | |
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418 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); |
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419 | } |
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420 | return ret; |
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421 | } |
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