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 const 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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446 stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
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447 stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
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448 stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
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449 stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
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450 stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
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452 stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
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453 stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
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454 stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
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456 memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
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457 EXT4_MP_UNLOCK(mp);
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462 int ext4_mount_setup_locks(const char * mount_point,
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463 const struct ext4_lock *locks)
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466 struct ext4_mountpoint *mp = 0;
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468 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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469 if(!strcmp(_mp[i].name, mount_point)){
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477 mp->os_locks = locks;
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481 /********************************FILE OPERATIONS*****************************/
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483 static struct ext4_mountpoint* ext4_get_mount(const char *path)
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486 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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488 if(!_mp[i].mounted)
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491 if(!strncmp(_mp[i].name, path, strlen(_mp[i].name)))
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497 static int ext4_path_check(const char *path, bool* is_goal)
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501 for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
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503 if(path[i] == '/'){
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517 static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
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522 if(!strcmp(flags, "r") || !strcmp(flags, "rb")){
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523 *file_flags = O_RDONLY;
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527 if(!strcmp(flags, "w") || !strcmp(flags, "wb")){
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528 *file_flags = O_WRONLY | O_CREAT | O_TRUNC;
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532 if(!strcmp(flags, "a") || !strcmp(flags, "ab")){
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533 *file_flags = O_WRONLY | O_CREAT | O_APPEND;
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537 if(!strcmp(flags, "r+") || !strcmp(flags, "rb+") || !strcmp(flags, "r+b")){
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538 *file_flags = O_RDWR;
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542 if(!strcmp(flags, "w+") || !strcmp(flags, "wb+") || !strcmp(flags, "w+b")){
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543 *file_flags = O_RDWR | O_CREAT | O_TRUNC;
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547 if(!strcmp(flags, "a+") || !strcmp(flags, "ab+") || !strcmp(flags, "a+b")){
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548 *file_flags = O_RDWR | O_CREAT | O_APPEND;
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555 /****************************************************************************/
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557 static int ext4_generic_open (ext4_file *f, const char *path,
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558 const char *flags, bool file_expect, uint32_t *parent_inode, uint32_t *name_off)
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560 struct ext4_mountpoint *mp = ext4_get_mount(path);
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561 struct ext4_directory_search_result result;
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562 struct ext4_inode_ref ref;
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563 bool is_goal = false;
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564 uint8_t inode_type = EXT4_DIRECTORY_FILETYPE_DIR;
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566 uint32_t next_inode;
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573 if(ext4_parse_flags(flags, &f->flags) == false)
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576 /*Skip mount point*/
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577 path += strlen(mp->name);
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580 *name_off = strlen(mp->name);
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583 r = ext4_fs_get_inode_ref(&mp->fs, EXT4_INODE_ROOT_INDEX, &ref);
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589 *parent_inode = ref.index;
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591 int len = ext4_path_check(path, &is_goal);
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595 len = ext4_path_check(path, &is_goal);
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598 /*If root open was request.*/
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599 if(is_goal && !file_expect)
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606 r = ext4_dir_find_entry(&result, &ref, path, len);
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612 if(!(f->flags & O_CREAT))
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615 /*O_CREAT allows create new entry*/
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616 struct ext4_inode_ref child_ref;
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617 r = ext4_fs_alloc_inode(&mp->fs, &child_ref, is_goal ? !file_expect : true);
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621 /*Destroy last result*/
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622 ext4_dir_destroy_result(&ref, &result);
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624 /*Link with root dir.*/
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625 r = ext4_link(mp, &ref, &child_ref, path, len);
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627 /*Fali. Free new inode.*/
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628 ext4_fs_free_inode(&child_ref);
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629 /*We do not want to write new inode.
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630 But block has to be released.*/
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631 child_ref.dirty = false;
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632 ext4_fs_put_inode_ref(&child_ref);
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636 ext4_fs_put_inode_ref(&child_ref);
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642 *parent_inode = ref.index;
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644 next_inode = result.dentry->inode;
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645 inode_type = ext4_dir_entry_ll_get_inode_type(&mp->fs.sb, result.dentry);
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647 r = ext4_dir_destroy_result(&ref, &result);
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651 /*If expected file error*/
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652 if((inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)
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653 && !file_expect && is_goal){
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658 /*If expected directory error*/
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659 if((inode_type == EXT4_DIRECTORY_FILETYPE_DIR)
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660 && file_expect && is_goal){
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665 r = ext4_fs_put_inode_ref(&ref);
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669 r = ext4_fs_get_inode_ref(&mp->fs, next_inode, &ref);
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679 *name_off += len + 1;
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683 ext4_fs_put_inode_ref(&ref);
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689 if((f->flags & O_TRUNC) &&
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690 (inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)){
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692 r = ext4_fs_truncate_inode(&ref, 0);
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694 ext4_fs_put_inode_ref(&ref);
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700 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
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701 f->inode = ref.index;
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704 if(f->flags & O_APPEND)
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705 f->fpos = f->fsize;
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708 r = ext4_fs_put_inode_ref(&ref);
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712 /****************************************************************************/
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714 int ext4_cache_write_back(const char *path, bool on)
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716 struct ext4_mountpoint *mp = ext4_get_mount(path);
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722 ext4_block_cache_write_back(mp->fs.bdev, on);
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723 EXT4_MP_UNLOCK(mp);
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728 int ext4_fremove(const char *path)
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731 uint32_t parent_inode;
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736 struct ext4_mountpoint *mp = ext4_get_mount(path);
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738 struct ext4_inode_ref child;
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739 struct ext4_inode_ref parent;
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745 r = ext4_generic_open(&f, path, "r", true, &parent_inode, &name_off);
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747 EXT4_MP_UNLOCK(mp);
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752 r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
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754 EXT4_MP_UNLOCK(mp);
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758 /*We have file to delete. Load it.*/
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759 r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
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761 ext4_fs_put_inode_ref(&parent);
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762 EXT4_MP_UNLOCK(mp);
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767 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
768 /*Truncate may be IO heavy. Do it writeback cache mode.*/
\r
769 r = ext4_fs_truncate_inode(&child, 0);
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770 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
778 len = ext4_path_check(path, &is_goal);
\r
780 /*Unlink from parent.*/
\r
781 r = ext4_unlink(mp, &parent, &child, path, len);
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785 r = ext4_fs_free_inode(&child);
\r
790 ext4_fs_put_inode_ref(&child);
\r
791 ext4_fs_put_inode_ref(&parent);
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792 EXT4_MP_UNLOCK(mp);
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796 int ext4_fopen (ext4_file *f, const char *path, const char *flags)
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798 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
805 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
806 r = ext4_generic_open(f, path, flags, true, 0, 0);
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807 ext4_block_cache_write_back(mp->fs.bdev, 0);
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808 EXT4_MP_UNLOCK(mp);
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812 int ext4_fclose(ext4_file *f)
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814 ext4_assert(f && f->mp);
\r
819 f->fpos = f->fsize = 0;
\r
823 int ext4_fread(ext4_file *f, void *buf, uint32_t size, uint32_t *rcnt)
\r
828 uint32_t fblock_start;
\r
829 uint32_t fblock_cnt;
\r
830 struct ext4_block b;
\r
831 uint8_t *u8_buf = buf;
\r
832 struct ext4_inode_ref ref;
\r
834 uint32_t sblock_end;
\r
835 uint32_t block_size;
\r
837 ext4_assert(f && f->mp);
\r
839 if(f->flags & O_WRONLY)
\r
845 EXT4_MP_LOCK(f->mp);
\r
850 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
852 EXT4_MP_UNLOCK(f->mp);
\r
857 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
860 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
861 size = size > (f->fsize - f->fpos) ? (f->fsize - f->fpos) : size;
\r
862 sblock = (f->fpos) / block_size;
\r
863 sblock_end = (f->fpos + size) / block_size;
\r
864 u = (f->fpos) % block_size;
\r
869 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
871 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
875 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
879 memcpy(u8_buf, b.data + u, ll);
\r
881 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
897 while(size >= block_size){
\r
898 while(sblock < sblock_end){
\r
899 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
906 fblock_start = fblock;
\r
909 if((fblock_start + fblock_cnt) != fblock)
\r
915 r = ext4_blocks_get_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
919 size -= block_size * fblock_cnt;
\r
920 u8_buf += block_size * fblock_cnt;
\r
921 f->fpos += block_size * fblock_cnt;
\r
924 *rcnt += block_size * fblock_cnt;
\r
926 fblock_start = fblock;
\r
931 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
935 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
939 memcpy(u8_buf, b.data , size);
\r
941 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
952 ext4_fs_put_inode_ref(&ref);
\r
953 EXT4_MP_UNLOCK(f->mp);
\r
957 int ext4_fwrite(ext4_file *f, void *buf, uint32_t size, uint32_t *wcnt)
\r
962 struct ext4_block b;
\r
963 uint8_t *u8_buf = buf;
\r
964 struct ext4_inode_ref ref;
\r
966 uint32_t sblock_end;
\r
967 uint32_t file_blocks;
\r
968 uint32_t block_size;
\r
969 uint32_t fblock_start;
\r
970 uint32_t fblock_cnt;
\r
972 ext4_assert(f && f->mp);
\r
974 if(f->flags & O_RDONLY)
\r
980 EXT4_MP_LOCK(f->mp);
\r
985 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
987 EXT4_MP_UNLOCK(f->mp);
\r
992 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
994 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
996 sblock_end = (f->fpos + size) > f->fsize ? (f->fpos + size) : f->fsize;
\r
997 sblock_end /= block_size;
\r
998 file_blocks = (f->fsize / block_size);
\r
1000 if(f->fsize % block_size)
\r
1003 sblock = (f->fpos) / block_size;
\r
1005 u = (f->fpos) % block_size;
\r
1009 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
1011 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1015 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1019 memcpy(b.data + u, u8_buf, ll);
\r
1022 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1037 /*Start write back cache mode.*/
\r
1038 r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
\r
1044 while(size >= block_size){
\r
1046 while(sblock < sblock_end){
\r
1047 if(sblock < file_blocks){
\r
1048 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1053 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1060 if(!fblock_start){
\r
1061 fblock_start = fblock;
\r
1064 if((fblock_start + fblock_cnt) != fblock)
\r
1070 r = ext4_blocks_set_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
1074 size -= block_size * fblock_cnt;
\r
1075 u8_buf += block_size * fblock_cnt;
\r
1076 f->fpos += block_size * fblock_cnt;
\r
1079 *wcnt += block_size * fblock_cnt;
\r
1081 fblock_start = fblock;
\r
1085 /*Stop write back cache mode*/
\r
1086 ext4_block_cache_write_back(f->mp->fs.bdev, 0);
\r
1092 if(sblock < file_blocks){
\r
1093 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1098 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1103 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1107 memcpy(b.data, u8_buf , size);
\r
1110 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1120 if(f->fpos > f->fsize){
\r
1121 f->fsize = f->fpos;
\r
1122 ext4_inode_set_size(ref.inode, f->fsize);
\r
1127 ext4_fs_put_inode_ref(&ref);
\r
1128 EXT4_MP_UNLOCK(f->mp);
\r
1133 int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin)
\r
1137 if(offset > f->fsize)
\r
1143 if((offset + f->fpos) > f->fsize)
\r
1146 f->fpos += offset;
\r
1149 if(offset > f->fsize)
\r
1152 f->fpos = f->fsize - offset;
\r
1159 uint64_t ext4_ftell (ext4_file *f)
\r
1164 uint64_t ext4_fsize (ext4_file *f)
\r
1169 /*********************************DIRECTORY OPERATION************************/
\r
1171 int ext4_dir_rm(const char *path)
\r
1177 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1178 struct ext4_inode_ref current;
\r
1179 struct ext4_inode_ref child;
\r
1180 struct ext4_directory_iterator it;
\r
1182 uint32_t name_off;
\r
1183 uint32_t inode_up;
\r
1184 uint32_t inode_current;
\r
1185 uint32_t depth = 1;
\r
1187 bool has_children;
\r
1196 /*Check if exist.*/
\r
1197 r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
\r
1199 EXT4_MP_UNLOCK(mp);
\r
1204 len = ext4_path_check(path, &is_goal);
\r
1206 inode_current = f.inode;
\r
1209 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
1212 /*Load directory node.*/
\r
1213 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current, ¤t);
\r
1218 /*Initialize iterator.*/
\r
1219 r = ext4_dir_iterator_init(&it, ¤t, 0);
\r
1221 ext4_fs_put_inode_ref(¤t);
\r
1232 /*Get up directory inode when ".." entry*/
\r
1233 if((it.current->name_length == 2) &&
\r
1234 ext4_is_dots(it.current->name, it.current->name_length)){
\r
1235 inode_up = it.current->inode;
\r
1238 /*If directory or file entry, but not "." ".." entry*/
\r
1239 if(!ext4_is_dots(it.current->name, it.current->name_length)){
\r
1241 /*Get child inode reference do unlink directory/file.*/
\r
1242 r = ext4_fs_get_inode_ref(&f.mp->fs, it.current->inode, &child);
\r
1246 /*If directory with no leaf children*/
\r
1247 r = ext4_has_children(&has_children, &child);
\r
1249 ext4_fs_put_inode_ref(&child);
\r
1254 /*Has directory children. Go into this tirectory.*/
\r
1255 inode_up = inode_current;
\r
1256 inode_current = it.current->inode;
\r
1258 ext4_fs_put_inode_ref(&child);
\r
1262 /*Directory is empty. Truncate it.*/
\r
1263 r = ext4_fs_truncate_inode(&child, 0);
\r
1265 ext4_fs_put_inode_ref(&child);
\r
1269 /*No children in child directory or file. Just unlink.*/
\r
1270 r = ext4_unlink(f.mp, ¤t, &child,
\r
1271 (char *)it.current->name, it.current->name_length);
\r
1273 ext4_fs_put_inode_ref(&child);
\r
1277 r = ext4_fs_free_inode(&child);
\r
1279 ext4_fs_put_inode_ref(&child);
\r
1283 r = ext4_fs_put_inode_ref(&child);
\r
1288 r = ext4_dir_iterator_next(&it);
\r
1292 /*Directory iterator reached last entry*/
\r
1293 ext4_has_children(&has_children, ¤t);
\r
1294 if(!has_children){
\r
1295 inode_current = inode_up;
\r
1302 struct ext4_inode_ref parent;
\r
1303 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up, &parent);
\r
1307 r = ext4_fs_truncate_inode(¤t, 0);
\r
1309 ext4_fs_put_inode_ref(&parent);
\r
1313 /* In this place all directories should be unlinked.
\r
1314 * Last unlink from root of current directory*/
\r
1315 r = ext4_unlink(f.mp, &parent, ¤t, (char *)path, len);
\r
1317 ext4_fs_put_inode_ref(&parent);
\r
1321 r = ext4_fs_free_inode(¤t);
\r
1323 ext4_fs_put_inode_ref(&parent);
\r
1327 r = ext4_fs_put_inode_ref(&parent);
\r
1334 ext4_dir_iterator_fini(&it);
\r
1335 ext4_fs_put_inode_ref(¤t);
\r
1338 /*When something goes wrong. End loop.*/
\r
1344 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
1345 EXT4_MP_UNLOCK(mp);
\r
1349 int ext4_dir_mk(const char *path)
\r
1354 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1361 /*Check if exist.*/
\r
1362 r = ext4_generic_open(&f, path, "r", false, 0, 0);
\r
1364 /*Directory already created*/
\r
1365 EXT4_MP_UNLOCK(mp);
\r
1369 /*Create new dir*/
\r
1370 r = ext4_generic_open(&f, path, "w", false, 0, 0);
\r
1372 EXT4_MP_UNLOCK(mp);
\r
1376 EXT4_MP_UNLOCK(mp);
\r
1380 int ext4_dir_open (ext4_dir *d, const char *path)
\r
1382 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1389 r = ext4_generic_open(&d->f, path, "r", false, 0, 0);
\r
1390 EXT4_MP_UNLOCK(mp);
\r
1394 int ext4_dir_close(ext4_dir *d)
\r
1396 return ext4_fclose(&d->f);
\r
1399 ext4_direntry* ext4_dir_entry_get(ext4_dir *d, uint32_t id)
\r
1403 ext4_direntry *de = 0;
\r
1404 struct ext4_inode_ref dir;
\r
1405 struct ext4_directory_iterator it;
\r
1407 EXT4_MP_LOCK(d->f.mp);
\r
1409 r = ext4_fs_get_inode_ref(&d->f.mp->fs, d->f.inode, &dir);
\r
1414 r = ext4_dir_iterator_init(&it, &dir, 0);
\r
1416 ext4_fs_put_inode_ref(&dir);
\r
1427 memcpy(&d->de, it.current, sizeof(ext4_direntry));
\r
1433 r = ext4_dir_iterator_next(&it);
\r
1436 ext4_dir_iterator_fini(&it);
\r
1437 ext4_fs_put_inode_ref(&dir);
\r
1440 EXT4_MP_UNLOCK(d->f.mp);
\r