2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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9 * - Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 * - Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 * - The name of the author may not be used to endorse or promote products
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15 * derived from this software without specific prior written permission.
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17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 /** @addtogroup lwext4
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34 * @brief Ext4 high level operations (file, directory, mountpoints...)
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37 #include <ext4_config.h>
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38 #include <ext4_blockdev.h>
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39 #include <ext4_types.h>
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40 #include <ext4_debug.h>
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41 #include <ext4_errno.h>
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42 #include <ext4_fs.h>
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43 #include <ext4_dir.h>
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44 #include <ext4_inode.h>
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45 #include <ext4_super.h>
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46 #include <ext4_dir_idx.h>
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53 /**@brief Mount point OS dependent lock*/
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54 #define EXT4_MP_LOCK(_m) \
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55 do { if((_m)->os_locks) (_m)->os_locks->lock(); }while(0)
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57 /**@brief Mount point OS dependent unlock*/
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58 #define EXT4_MP_UNLOCK(_m) \
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59 do { if((_m)->os_locks) (_m)->os_locks->unlock(); }while(0)
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61 /**@brief Mount point descrpitor.*/
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62 struct ext4_mountpoint {
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64 /**@brief Mount done flag.*/
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67 /**@brief Mount point name (@ref ext4_mount)*/
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70 /**@brief Os dependent lock/unlock functions.*/
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71 struct ext4_lock *os_locks;
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73 /**@brief Ext4 filesystem internals.*/
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76 /**@brief Dynamic alocation cache flag.*/
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80 /**@brief Block devices descriptor.*/
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81 struct _ext4_devices {
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83 /**@brief Block device name (@ref ext4_device_register)*/
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86 /**@brief Block device handle.*/
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87 struct ext4_blockdev *bd;
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89 /**@brief Block cache handle.*/
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90 struct ext4_bcache *bc;
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93 /**@brief Block devices.*/
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94 struct _ext4_devices _bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
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97 /**@brief Mountpoints.*/
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98 struct ext4_mountpoint _mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
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101 int ext4_device_register(struct ext4_blockdev *bd, struct ext4_bcache *bc,
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102 const char *dev_name)
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105 ext4_assert(bd && dev_name);
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107 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
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108 if(!_bdevices[i].bd){
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109 strcpy(_bdevices[i].name, dev_name);
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110 _bdevices[i].bd = bd;
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111 _bdevices[i].bc = bc;
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115 if(!strcmp(_bdevices[i].name, dev_name))
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121 /****************************************************************************/
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124 static bool ext4_is_dots(const uint8_t *name, size_t name_size)
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126 if ((name_size == 1) && (name[0] == '.'))
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129 if ((name_size == 2) && (name[0] == '.') && (name[1] == '.'))
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135 static int ext4_has_children(bool *has_children, struct ext4_inode_ref *enode)
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137 struct ext4_fs *fs = enode->fs;
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139 /* Check if node is directory */
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140 if (!ext4_inode_is_type(&fs->sb, enode->inode,
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141 EXT4_INODE_MODE_DIRECTORY)) {
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142 *has_children = false;
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146 struct ext4_directory_iterator it;
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147 int rc = ext4_dir_iterator_init(&it, enode, 0);
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151 /* Find a non-empty directory entry */
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152 bool found = false;
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153 while (it.current != NULL) {
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154 if (it.current->inode != 0) {
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155 uint16_t name_size =
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156 ext4_dir_entry_ll_get_name_length(&fs->sb,
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158 if (!ext4_is_dots(it.current->name, name_size)) {
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164 rc = ext4_dir_iterator_next(&it);
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166 ext4_dir_iterator_fini(&it);
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171 rc = ext4_dir_iterator_fini(&it);
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175 *has_children = found;
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181 static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
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182 struct ext4_inode_ref *child, const char *name, uint32_t name_len)
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184 /* Check maximum name length */
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185 if(name_len > EXT4_DIRECTORY_FILENAME_LEN)
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188 /* Add entry to parent directory */
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189 int rc = ext4_dir_add_entry(parent, name, name_len,
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194 /* Fill new dir -> add '.' and '..' entries */
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195 if (ext4_inode_is_type(&mp->fs.sb, child->inode,
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196 EXT4_INODE_MODE_DIRECTORY)) {
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197 rc = ext4_dir_add_entry(child, ".", strlen("."),
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200 ext4_dir_remove_entry(parent, name, strlen(name));
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204 rc = ext4_dir_add_entry(child, "..", strlen(".."),
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207 ext4_dir_remove_entry(parent, name, strlen(name));
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208 ext4_dir_remove_entry(child, ".", strlen("."));
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212 #if CONFIG_DIR_INDEX_ENABLE
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213 /* Initialize directory index if supported */
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214 if (ext4_sb_check_feature_compatible(&mp->fs.sb,
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215 EXT4_FEATURE_COMPAT_DIR_INDEX)) {
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216 rc = ext4_dir_dx_init(child);
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220 ext4_inode_set_flag(child->inode,
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221 EXT4_INODE_FLAG_INDEX);
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222 child->dirty = true;
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226 uint16_t parent_links =
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227 ext4_inode_get_links_count(parent->inode);
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229 ext4_inode_set_links_count(parent->inode, parent_links);
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231 parent->dirty = true;
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234 uint16_t child_links =
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235 ext4_inode_get_links_count(child->inode);
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237 ext4_inode_set_links_count(child->inode, child_links);
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239 child->dirty = true;
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244 static int ext4_unlink(struct ext4_mountpoint *mp,
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245 struct ext4_inode_ref *parent, struct ext4_inode_ref *child_inode_ref,
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246 const char *name, uint32_t name_len)
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249 int rc = ext4_has_children(&has_children, child_inode_ref);
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253 /* Cannot unlink non-empty node */
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257 /* Remove entry from parent directory */
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259 rc = ext4_dir_remove_entry(parent, name, name_len);
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264 uint32_t lnk_count =
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265 ext4_inode_get_links_count(child_inode_ref->inode);
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268 bool is_dir = ext4_inode_is_type(&mp->fs.sb, child_inode_ref->inode,
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269 EXT4_INODE_MODE_DIRECTORY);
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271 /* If directory - handle links from parent */
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272 if ((lnk_count <= 1) && (is_dir)) {
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273 ext4_assert(lnk_count == 1);
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277 uint32_t parent_lnk_count = ext4_inode_get_links_count(
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280 parent_lnk_count--;
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281 ext4_inode_set_links_count(parent->inode, parent_lnk_count);
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283 parent->dirty = true;
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287 * TODO: Update timestamps of the parent
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288 * (when we have wall-clock time).
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290 * ext4_inode_set_change_inode_time(parent->inode, (uint32_t) now);
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291 * ext4_inode_set_modification_time(parent->inode, (uint32_t) now);
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292 * parent->dirty = true;
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296 * TODO: Update timestamp for inode.
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298 * ext4_inode_set_change_inode_time(child_inode_ref->inode,
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302 ext4_inode_set_deletion_time(child_inode_ref->inode, 1);
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303 ext4_inode_set_links_count(child_inode_ref->inode, lnk_count);
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304 child_inode_ref->dirty = true;
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309 /****************************************************************************/
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311 int ext4_mount(const char * dev_name, char *mount_point)
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313 ext4_assert(mount_point && dev_name);
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318 struct ext4_blockdev *bd = 0;
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319 struct ext4_bcache *bc = 0;
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320 struct ext4_mountpoint *mp = 0;
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322 if(mount_point[strlen(mount_point) - 1] != '/')
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325 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
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326 if(_bdevices[i].name){
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327 if(!strcmp(dev_name, _bdevices[i].name)){
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328 bd = _bdevices[i].bd;
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329 bc = _bdevices[i].bc;
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338 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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339 if(!_mp[i].mounted){
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340 strcpy(_mp[i].name, mount_point);
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341 _mp[i].mounted = 1;
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346 if(!strcmp(_mp[i].name, mount_point)){
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354 r = ext4_block_init(bd);
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358 r = ext4_fs_init(&mp->fs, bd);
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360 ext4_block_fini(bd);
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364 bsize = ext4_sb_get_block_size(&mp->fs.sb);
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365 ext4_block_set_lb_size(bd, bsize);
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367 mp->cache_dynamic = 0;
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370 /*Automatic block cache alloc.*/
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371 mp->cache_dynamic = 1;
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372 bc = malloc(sizeof(struct ext4_bcache));
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374 r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
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377 ext4_block_fini(bd);
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382 if(bsize != bc->itemsize)
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385 /*Bind block cache to block device*/
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386 r = ext4_block_bind_bcache(bd, bc);
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388 ext4_block_fini(bd);
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389 if(mp->cache_dynamic){
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390 ext4_bcache_fini_dynamic(bc);
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400 int ext4_umount(char *mount_point)
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404 struct ext4_mountpoint *mp = 0;
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406 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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407 if(!strcmp(_mp[i].name, mount_point)){
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416 r = ext4_fs_fini(&mp->fs);
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422 if(mp->cache_dynamic){
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423 ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
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424 free(mp->fs.bdev->bc);
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427 return ext4_block_fini(mp->fs.bdev);
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430 int ext4_mount_point_stats(const char *mount_point,
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431 struct ext4_mount_stats *stats)
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434 struct ext4_mountpoint *mp = 0;
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436 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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437 if(!strcmp(_mp[i].name, mount_point)){
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447 stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
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448 stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
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449 stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
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450 stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
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451 stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
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453 stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
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454 stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
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455 stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
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457 memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
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458 EXT4_MP_UNLOCK(mp);
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463 /********************************FILE OPERATIONS*****************************/
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465 static struct ext4_mountpoint* ext4_get_mount(const char *path)
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468 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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470 if(!_mp[i].mounted)
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473 if(!strncmp(_mp[i].name, path, strlen(_mp[i].name)))
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479 static int ext4_path_check(const char *path, bool* is_goal)
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483 for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
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485 if(path[i] == '/'){
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499 static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
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504 if(!strcmp(flags, "r") || !strcmp(flags, "rb")){
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505 *file_flags = O_RDONLY;
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509 if(!strcmp(flags, "w") || !strcmp(flags, "wb")){
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510 *file_flags = O_WRONLY | O_CREAT | O_TRUNC;
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514 if(!strcmp(flags, "a") || !strcmp(flags, "ab")){
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515 *file_flags = O_WRONLY | O_CREAT | O_APPEND;
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519 if(!strcmp(flags, "r+") || !strcmp(flags, "rb+") || !strcmp(flags, "r+b")){
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520 *file_flags = O_RDWR;
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524 if(!strcmp(flags, "w+") || !strcmp(flags, "wb+") || !strcmp(flags, "w+b")){
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525 *file_flags = O_RDWR | O_CREAT | O_TRUNC;
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529 if(!strcmp(flags, "a+") || !strcmp(flags, "ab+") || !strcmp(flags, "a+b")){
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530 *file_flags = O_RDWR | O_CREAT | O_APPEND;
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537 /****************************************************************************/
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539 static int ext4_generic_open (ext4_file *f, const char *path,
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540 const char *flags, bool file_expect, uint32_t *parent_inode, uint32_t *name_off)
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542 struct ext4_mountpoint *mp = ext4_get_mount(path);
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543 struct ext4_directory_search_result result;
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544 struct ext4_inode_ref ref;
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545 bool is_goal = false;
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546 uint8_t inode_type = EXT4_DIRECTORY_FILETYPE_DIR;
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548 uint32_t next_inode;
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555 if(ext4_parse_flags(flags, &f->flags) == false)
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558 /*Skip mount point*/
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559 path += strlen(mp->name);
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562 *name_off = strlen(mp->name);
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565 r = ext4_fs_get_inode_ref(&mp->fs, EXT4_INODE_ROOT_INDEX, &ref);
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571 *parent_inode = ref.index;
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573 int len = ext4_path_check(path, &is_goal);
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577 len = ext4_path_check(path, &is_goal);
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580 /*If root open was request.*/
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581 if(is_goal && !file_expect)
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588 r = ext4_dir_find_entry(&result, &ref, path, len);
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594 if(!(f->flags & O_CREAT))
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597 /*O_CREAT allows create new entry*/
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598 struct ext4_inode_ref child_ref;
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599 r = ext4_fs_alloc_inode(&mp->fs, &child_ref, is_goal ? !file_expect : true);
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603 /*Destroy last result*/
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604 ext4_dir_destroy_result(&ref, &result);
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606 /*Link with root dir.*/
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607 r = ext4_link(mp, &ref, &child_ref, path, len);
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609 /*Fali. Free new inode.*/
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610 ext4_fs_free_inode(&child_ref);
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611 /*We do not want to write new inode.
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612 But block has to be released.*/
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613 child_ref.dirty = false;
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614 ext4_fs_put_inode_ref(&child_ref);
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618 ext4_fs_put_inode_ref(&child_ref);
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624 *parent_inode = ref.index;
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626 next_inode = result.dentry->inode;
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627 inode_type = ext4_dir_entry_ll_get_inode_type(&mp->fs.sb, result.dentry);
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629 r = ext4_dir_destroy_result(&ref, &result);
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633 /*If expected file error*/
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634 if((inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)
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635 && !file_expect && is_goal){
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640 /*If expected directory error*/
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641 if((inode_type == EXT4_DIRECTORY_FILETYPE_DIR)
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642 && file_expect && is_goal){
\r
647 r = ext4_fs_put_inode_ref(&ref);
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651 r = ext4_fs_get_inode_ref(&mp->fs, next_inode, &ref);
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661 *name_off += len + 1;
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665 ext4_fs_put_inode_ref(&ref);
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671 if((f->flags & O_TRUNC) &&
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672 (inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)){
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674 r = ext4_fs_truncate_inode(&ref, 0);
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676 ext4_fs_put_inode_ref(&ref);
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682 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
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683 f->inode = ref.index;
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686 if(f->flags & O_APPEND)
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687 f->fpos = f->fsize;
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690 r = ext4_fs_put_inode_ref(&ref);
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694 /****************************************************************************/
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696 int ext4_cache_write_back(const char *path, bool on)
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698 struct ext4_mountpoint *mp = ext4_get_mount(path);
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704 ext4_block_cache_write_back(mp->fs.bdev, on);
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705 EXT4_MP_UNLOCK(mp);
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710 int ext4_fremove(const char *path)
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713 uint32_t parent_inode;
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718 struct ext4_mountpoint *mp = ext4_get_mount(path);
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720 struct ext4_inode_ref child;
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721 struct ext4_inode_ref parent;
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727 r = ext4_generic_open(&f, path, "r", true, &parent_inode, &name_off);
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729 EXT4_MP_UNLOCK(mp);
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734 r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
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736 EXT4_MP_UNLOCK(mp);
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740 /*We have file to delete. Load it.*/
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741 r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
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743 ext4_fs_put_inode_ref(&parent);
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744 EXT4_MP_UNLOCK(mp);
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749 ext4_block_cache_write_back(mp->fs.bdev, 1);
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750 /*Truncate may be IO heavy. Do it writeback cache mode.*/
\r
751 r = ext4_fs_truncate_inode(&child, 0);
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752 ext4_block_cache_write_back(mp->fs.bdev, 0);
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760 len = ext4_path_check(path, &is_goal);
\r
762 /*Unlink from parent.*/
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763 r = ext4_unlink(mp, &parent, &child, path, len);
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767 r = ext4_fs_free_inode(&child);
\r
772 ext4_fs_put_inode_ref(&child);
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773 ext4_fs_put_inode_ref(&parent);
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774 EXT4_MP_UNLOCK(mp);
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778 int ext4_fopen (ext4_file *f, const char *path, const char *flags)
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780 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
787 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
788 r = ext4_generic_open(f, path, flags, true, 0, 0);
\r
789 ext4_block_cache_write_back(mp->fs.bdev, 0);
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790 EXT4_MP_UNLOCK(mp);
\r
794 int ext4_fclose(ext4_file *f)
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796 ext4_assert(f && f->mp);
\r
801 f->fpos = f->fsize = 0;
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805 int ext4_fread(ext4_file *f, void *buf, uint32_t size, uint32_t *rcnt)
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810 uint32_t fblock_start;
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811 uint32_t fblock_cnt;
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812 struct ext4_block b;
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813 uint8_t *u8_buf = buf;
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814 struct ext4_inode_ref ref;
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816 uint32_t sblock_end;
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817 uint32_t block_size;
\r
819 ext4_assert(f && f->mp);
\r
821 if(f->flags & O_WRONLY)
\r
827 EXT4_MP_LOCK(f->mp);
\r
832 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
834 EXT4_MP_UNLOCK(f->mp);
\r
839 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
842 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
843 size = size > (f->fsize - f->fpos) ? (f->fsize - f->fpos) : size;
\r
844 sblock = (f->fpos) / block_size;
\r
845 sblock_end = (f->fpos + size) / block_size;
\r
846 u = (f->fpos) % block_size;
\r
851 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
853 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
857 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
861 memcpy(u8_buf, b.data + u, ll);
\r
863 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
879 while(size >= block_size){
\r
880 while(sblock < sblock_end){
\r
881 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
888 fblock_start = fblock;
\r
891 if((fblock_start + fblock_cnt) != fblock)
\r
897 r = ext4_blocks_get_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
901 size -= block_size * fblock_cnt;
\r
902 u8_buf += block_size * fblock_cnt;
\r
903 f->fpos += block_size * fblock_cnt;
\r
906 *rcnt += block_size * fblock_cnt;
\r
908 fblock_start = fblock;
\r
913 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
917 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
921 memcpy(u8_buf, b.data , size);
\r
923 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
934 ext4_fs_put_inode_ref(&ref);
\r
935 EXT4_MP_UNLOCK(f->mp);
\r
939 int ext4_fwrite(ext4_file *f, void *buf, uint32_t size, uint32_t *wcnt)
\r
944 struct ext4_block b;
\r
945 uint8_t *u8_buf = buf;
\r
946 struct ext4_inode_ref ref;
\r
948 uint32_t sblock_end;
\r
949 uint32_t file_blocks;
\r
950 uint32_t block_size;
\r
951 uint32_t fblock_start;
\r
952 uint32_t fblock_cnt;
\r
954 ext4_assert(f && f->mp);
\r
956 if(f->flags & O_RDONLY)
\r
962 EXT4_MP_LOCK(f->mp);
\r
967 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
969 EXT4_MP_UNLOCK(f->mp);
\r
974 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
976 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
978 sblock_end = (f->fpos + size) > f->fsize ? (f->fpos + size) : f->fsize;
\r
979 sblock_end /= block_size;
\r
980 file_blocks = (f->fsize / block_size);
\r
982 if(f->fsize % block_size)
\r
985 sblock = (f->fpos) / block_size;
\r
987 u = (f->fpos) % block_size;
\r
991 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
993 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
997 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1001 memcpy(b.data + u, u8_buf, ll);
\r
1004 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1019 /*Start write back cache mode.*/
\r
1020 r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
\r
1026 while(size >= block_size){
\r
1028 while(sblock < sblock_end){
\r
1029 if(sblock < file_blocks){
\r
1030 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1035 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1042 if(!fblock_start){
\r
1043 fblock_start = fblock;
\r
1046 if((fblock_start + fblock_cnt) != fblock)
\r
1052 r = ext4_blocks_set_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
1056 size -= block_size * fblock_cnt;
\r
1057 u8_buf += block_size * fblock_cnt;
\r
1058 f->fpos += block_size * fblock_cnt;
\r
1061 *wcnt += block_size * fblock_cnt;
\r
1063 fblock_start = fblock;
\r
1067 /*Stop write back cache mode*/
\r
1068 ext4_block_cache_write_back(f->mp->fs.bdev, 0);
\r
1074 if(sblock < file_blocks){
\r
1075 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1080 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1085 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1089 memcpy(b.data, u8_buf , size);
\r
1092 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1102 if(f->fpos > f->fsize){
\r
1103 f->fsize = f->fpos;
\r
1104 ext4_inode_set_size(ref.inode, f->fsize);
\r
1109 ext4_fs_put_inode_ref(&ref);
\r
1110 EXT4_MP_UNLOCK(f->mp);
\r
1115 int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin)
\r
1119 if(offset > f->fsize)
\r
1125 if((offset + f->fpos) > f->fsize)
\r
1128 f->fpos += offset;
\r
1131 if(offset > f->fsize)
\r
1134 f->fpos = f->fsize - offset;
\r
1141 uint64_t ext4_ftell (ext4_file *f)
\r
1146 uint64_t ext4_fsize (ext4_file *f)
\r
1151 /*********************************DIRECTORY OPERATION************************/
\r
1153 int ext4_dir_rm(const char *path)
\r
1159 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1160 struct ext4_inode_ref current;
\r
1161 struct ext4_inode_ref child;
\r
1162 struct ext4_directory_iterator it;
\r
1164 uint32_t name_off;
\r
1165 uint32_t inode_up;
\r
1166 uint32_t inode_current;
\r
1167 uint32_t depth = 1;
\r
1169 bool has_children;
\r
1178 /*Check if exist.*/
\r
1179 r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
\r
1181 EXT4_MP_UNLOCK(mp);
\r
1186 len = ext4_path_check(path, &is_goal);
\r
1188 inode_current = f.inode;
\r
1191 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
1194 /*Load directory node.*/
\r
1195 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current, ¤t);
\r
1200 /*Initialize iterator.*/
\r
1201 r = ext4_dir_iterator_init(&it, ¤t, 0);
\r
1203 ext4_fs_put_inode_ref(¤t);
\r
1214 /*Get up directory inode when ".." entry*/
\r
1215 if((it.current->name_length == 2) &&
\r
1216 ext4_is_dots(it.current->name, it.current->name_length)){
\r
1217 inode_up = it.current->inode;
\r
1220 /*If directory or file entry, but not "." ".." entry*/
\r
1221 if(!ext4_is_dots(it.current->name, it.current->name_length)){
\r
1223 /*Get child inode reference do unlink directory/file.*/
\r
1224 r = ext4_fs_get_inode_ref(&f.mp->fs, it.current->inode, &child);
\r
1228 /*If directory with no leaf children*/
\r
1229 r = ext4_has_children(&has_children, &child);
\r
1231 ext4_fs_put_inode_ref(&child);
\r
1236 /*Has directory children. Go into this tirectory.*/
\r
1237 inode_up = inode_current;
\r
1238 inode_current = it.current->inode;
\r
1240 ext4_fs_put_inode_ref(&child);
\r
1244 /*Directory is empty. Truncate it.*/
\r
1245 r = ext4_fs_truncate_inode(&child, 0);
\r
1247 ext4_fs_put_inode_ref(&child);
\r
1251 /*No children in child directory or file. Just unlink.*/
\r
1252 r = ext4_unlink(f.mp, ¤t, &child,
\r
1253 (char *)it.current->name, it.current->name_length);
\r
1255 ext4_fs_put_inode_ref(&child);
\r
1259 r = ext4_fs_free_inode(&child);
\r
1261 ext4_fs_put_inode_ref(&child);
\r
1265 r = ext4_fs_put_inode_ref(&child);
\r
1270 r = ext4_dir_iterator_next(&it);
\r
1274 /*Directory iterator reached last entry*/
\r
1275 ext4_has_children(&has_children, ¤t);
\r
1276 if(!has_children){
\r
1277 inode_current = inode_up;
\r
1284 struct ext4_inode_ref parent;
\r
1285 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up, &parent);
\r
1289 r = ext4_fs_truncate_inode(¤t, 0);
\r
1291 ext4_fs_put_inode_ref(&parent);
\r
1295 /* In this place all directories should be unlinked.
\r
1296 * Last unlink from root of current directory*/
\r
1297 r = ext4_unlink(f.mp, &parent, ¤t, (char *)path, len);
\r
1299 ext4_fs_put_inode_ref(&parent);
\r
1303 r = ext4_fs_free_inode(¤t);
\r
1305 ext4_fs_put_inode_ref(&parent);
\r
1309 r = ext4_fs_put_inode_ref(&parent);
\r
1316 ext4_dir_iterator_fini(&it);
\r
1317 ext4_fs_put_inode_ref(¤t);
\r
1320 /*When something goes wrong. End loop.*/
\r
1326 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
1327 EXT4_MP_UNLOCK(mp);
\r
1331 int ext4_dir_mk(const char *path)
\r
1336 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1343 /*Check if exist.*/
\r
1344 r = ext4_generic_open(&f, path, "r", false, 0, 0);
\r
1346 /*Directory already created*/
\r
1347 EXT4_MP_UNLOCK(mp);
\r
1351 /*Create new dir*/
\r
1352 r = ext4_generic_open(&f, path, "w", false, 0, 0);
\r
1354 EXT4_MP_UNLOCK(mp);
\r
1358 EXT4_MP_UNLOCK(mp);
\r
1362 int ext4_dir_open (ext4_dir *d, const char *path)
\r
1364 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1371 r = ext4_generic_open(&d->f, path, "r", false, 0, 0);
\r
1372 EXT4_MP_UNLOCK(mp);
\r
1376 int ext4_dir_close(ext4_dir *d)
\r
1378 return ext4_fclose(&d->f);
\r
1381 ext4_direntry* ext4_dir_entry_get(ext4_dir *d, uint32_t id)
\r
1385 ext4_direntry *de = 0;
\r
1386 struct ext4_inode_ref dir;
\r
1387 struct ext4_directory_iterator it;
\r
1389 EXT4_MP_LOCK(d->f.mp);
\r
1391 r = ext4_fs_get_inode_ref(&d->f.mp->fs, d->f.inode, &dir);
\r
1396 r = ext4_dir_iterator_init(&it, &dir, 0);
\r
1398 ext4_fs_put_inode_ref(&dir);
\r
1409 memcpy(&d->de, it.current, sizeof(ext4_direntry));
\r
1415 r = ext4_dir_iterator_next(&it);
\r
1418 ext4_dir_iterator_fini(&it);
\r
1419 ext4_fs_put_inode_ref(&dir);
\r
1422 EXT4_MP_UNLOCK(d->f.mp);
\r