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 { (_m)->os_locks ? (_m)->os_locks->lock() : 0; }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 { (_m)->os_locks ? (_m)->os_locks->unlock() : 0; }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 point name (@ref ext4_mount)*/
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67 /**@brief Os dependent lock/unlock functions.*/
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68 struct ext4_lock *os_locks;
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70 /**@brief Ext4 filesystem internals.*/
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73 /**@brief Dynamic alocation cache flag.*/
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77 /**@brief Block devices descriptor.*/
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78 struct _ext4_devices {
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80 /**@brief Block device name (@ref ext4_device_register)*/
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83 /**@brief Block device handle.*/
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84 struct ext4_blockdev *bd;
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86 /**@brief Block cache handle.*/
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87 struct ext4_bcache *bc;
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90 /**@brief Block devices.*/
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91 struct _ext4_devices _bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
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94 /**@brief Mountpoints.*/
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95 struct ext4_mountpoint _mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
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99 int ext4_device_register(struct ext4_blockdev *bd, struct ext4_bcache *bc,
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100 const char *dev_name)
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103 ext4_assert(bd && dev_name);
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105 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
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106 if(!_bdevices[i].name){
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107 _bdevices[i].name = dev_name;
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108 _bdevices[i].bd = bd;
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109 _bdevices[i].bc = bc;
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116 /****************************************************************************/
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119 static bool ext4_is_dots(const uint8_t *name, size_t name_size)
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121 if ((name_size == 1) && (name[0] == '.'))
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124 if ((name_size == 2) && (name[0] == '.') && (name[1] == '.'))
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130 static int ext4_has_children(bool *has_children, struct ext4_inode_ref *enode)
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133 struct ext4_fs *fs = enode->fs;
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135 /* Check if node is directory */
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136 if (!ext4_inode_is_type(&fs->sb, enode->inode,
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137 EXT4_INODE_MODE_DIRECTORY)) {
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138 *has_children = false;
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142 struct ext4_directory_iterator it;
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143 int rc = ext4_dir_iterator_init(&it, enode, 0);
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147 /* Find a non-empty directory entry */
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148 bool found = false;
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149 while (it.current != NULL) {
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150 if (it.current->inode != 0) {
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151 uint16_t name_size =
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152 ext4_dir_entry_ll_get_name_length(&fs->sb,
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154 if (!ext4_is_dots(it.current->name, name_size)) {
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160 rc = ext4_dir_iterator_next(&it);
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162 ext4_dir_iterator_fini(&it);
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167 rc = ext4_dir_iterator_fini(&it);
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171 *has_children = found;
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177 static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
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178 struct ext4_inode_ref *child, const char *name, uint32_t name_len)
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180 /* Check maximum name length */
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181 if(name_len > EXT4_DIRECTORY_FILENAME_LEN)
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184 /* Add entry to parent directory */
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185 int rc = ext4_dir_add_entry(parent, name, name_len,
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190 /* Fill new dir -> add '.' and '..' entries */
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191 if (ext4_inode_is_type(&mp->fs.sb, child->inode,
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192 EXT4_INODE_MODE_DIRECTORY)) {
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193 rc = ext4_dir_add_entry(child, ".", strlen("."),
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196 ext4_dir_remove_entry(parent, name, strlen(name));
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200 rc = ext4_dir_add_entry(child, "..", strlen(".."),
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203 ext4_dir_remove_entry(parent, name, strlen(name));
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204 ext4_dir_remove_entry(child, ".", strlen("."));
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208 #if CONFIG_DIR_INDEX_ENABLE
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209 /* Initialize directory index if supported */
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210 if (ext4_sb_check_feature_compatible(&mp->fs.sb,
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211 EXT4_FEATURE_COMPAT_DIR_INDEX)) {
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212 rc = ext4_dir_dx_init(child);
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216 ext4_inode_set_flag(child->inode,
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217 EXT4_INODE_FLAG_INDEX);
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218 child->dirty = true;
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222 uint16_t parent_links =
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223 ext4_inode_get_links_count(parent->inode);
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225 ext4_inode_set_links_count(parent->inode, parent_links);
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227 parent->dirty = true;
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230 uint16_t child_links =
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231 ext4_inode_get_links_count(child->inode);
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233 ext4_inode_set_links_count(child->inode, child_links);
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235 child->dirty = true;
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240 static int ext4_unlink(struct ext4_mountpoint *mp,
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241 struct ext4_inode_ref *parent, struct ext4_inode_ref *child_inode_ref,
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242 const char *name, uint32_t name_len)
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245 int rc = ext4_has_children(&has_children, child_inode_ref);
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249 /* Cannot unlink non-empty node */
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253 /* Remove entry from parent directory */
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255 rc = ext4_dir_remove_entry(parent, name, name_len);
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260 uint32_t lnk_count =
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261 ext4_inode_get_links_count(child_inode_ref->inode);
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264 bool is_dir = ext4_inode_is_type(&mp->fs.sb, child_inode_ref->inode,
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265 EXT4_INODE_MODE_DIRECTORY);
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267 /* If directory - handle links from parent */
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268 if ((lnk_count <= 1) && (is_dir)) {
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269 ext4_assert(lnk_count == 1);
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273 uint32_t parent_lnk_count = ext4_inode_get_links_count(
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276 parent_lnk_count--;
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277 ext4_inode_set_links_count(parent->inode, parent_lnk_count);
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279 parent->dirty = true;
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283 * TODO: Update timestamps of the parent
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284 * (when we have wall-clock time).
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286 * ext4_inode_set_change_inode_time(parent->inode, (uint32_t) now);
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287 * ext4_inode_set_modification_time(parent->inode, (uint32_t) now);
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288 * parent->dirty = true;
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292 * TODO: Update timestamp for inode.
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294 * ext4_inode_set_change_inode_time(child_inode_ref->inode,
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298 ext4_inode_set_deletion_time(child_inode_ref->inode, 1);
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299 ext4_inode_set_links_count(child_inode_ref->inode, lnk_count);
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300 child_inode_ref->dirty = true;
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305 /****************************************************************************/
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307 int ext4_mount(const char * dev_name, char *mount_point)
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309 ext4_assert(mount_point && dev_name);
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314 struct ext4_blockdev *bd = 0;
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315 struct ext4_bcache *bc = 0;
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316 struct ext4_mountpoint *mp = 0;
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318 if(mount_point[strlen(mount_point) - 1] != '/')
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321 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
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322 if(_bdevices[i].name){
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323 if(!strcmp(dev_name, _bdevices[i].name)){
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324 bd = _bdevices[i].bd;
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325 bc = _bdevices[i].bc;
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334 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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336 _mp[i].name = mount_point;
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345 r = ext4_block_init(bd);
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349 r = ext4_fs_init(&mp->fs, bd);
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351 ext4_block_fini(bd);
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355 bsize = ext4_sb_get_block_size(&mp->fs.sb);
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356 ext4_block_set_lb_size(bd, bsize);
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358 mp->cache_dynamic = 0;
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361 /*Automatic block cache alloc.*/
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362 mp->cache_dynamic = 1;
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363 bc = malloc(sizeof(struct ext4_bcache));
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365 r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
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368 ext4_block_fini(bd);
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373 if(bsize != bc->itemsize)
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376 /*Bind block cache to block device*/
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377 r = ext4_block_bind_bcache(bd, bc);
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379 ext4_block_fini(bd);
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380 if(mp->cache_dynamic){
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381 ext4_bcache_fini_dynamic(bc);
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391 int ext4_umount(char *mount_point)
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395 struct ext4_mountpoint *mp = 0;
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397 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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399 if(!strcmp(_mp[i].name, mount_point))
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408 r = ext4_fs_fini(&mp->fs);
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414 if(mp->cache_dynamic){
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415 ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
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416 free(mp->fs.bdev->bc);
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419 return ext4_block_fini(mp->fs.bdev);
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422 int ext4_mount_point_stats(const char *mount_point,
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423 struct ext4_mount_stats *stats)
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426 struct ext4_mountpoint *mp = 0;
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428 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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430 if(!strcmp(_mp[i].name, mount_point))
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439 stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
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440 stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
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441 stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
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442 stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
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443 stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
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445 stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
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446 stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
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447 stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
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449 memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
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450 EXT4_MP_UNLOCK(mp);
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455 /********************************FILE OPERATIONS*****************************/
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457 static struct ext4_mountpoint* ext4_get_mount(const char *path)
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460 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
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462 if(!strncmp(_mp[i].name, path, strlen(_mp[i].name)))
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469 static int ext4_path_check(const char *path, bool* is_goal)
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473 for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
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475 if(path[i] == '/'){
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489 static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
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494 if(!strcmp(flags, "r") || !strcmp(flags, "rb")){
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495 *file_flags = O_RDONLY;
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499 if(!strcmp(flags, "w") || !strcmp(flags, "wb")){
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500 *file_flags = O_WRONLY | O_CREAT | O_TRUNC;
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504 if(!strcmp(flags, "a") || !strcmp(flags, "ab")){
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505 *file_flags = O_WRONLY | O_CREAT | O_APPEND;
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509 if(!strcmp(flags, "r+") || !strcmp(flags, "rb+") || !strcmp(flags, "r+b")){
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510 *file_flags = O_RDWR;
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514 if(!strcmp(flags, "w+") || !strcmp(flags, "wb+") || !strcmp(flags, "w+b")){
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515 *file_flags = O_RDWR | O_CREAT | O_TRUNC;
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519 if(!strcmp(flags, "a+") || !strcmp(flags, "ab+") || !strcmp(flags, "a+b")){
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520 *file_flags = O_RDWR | O_CREAT | O_APPEND;
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527 /****************************************************************************/
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529 static int ext4_generic_open (ext4_file *f, const char *path,
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530 const char *flags, bool file_expect, uint32_t *parent_inode, uint32_t *name_off)
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532 struct ext4_mountpoint *mp = ext4_get_mount(path);
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533 struct ext4_directory_search_result result;
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534 struct ext4_inode_ref ref;
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535 bool is_goal = false;
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536 uint8_t inode_type = EXT4_DIRECTORY_FILETYPE_DIR;
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538 uint32_t next_inode;
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545 if(ext4_parse_flags(flags, &f->flags) == false)
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548 /*Skip mount point*/
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549 path += strlen(mp->name);
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552 *name_off = strlen(mp->name);
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555 r = ext4_fs_get_inode_ref(&mp->fs, EXT4_INODE_ROOT_INDEX, &ref);
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561 *parent_inode = ref.index;
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563 int len = ext4_path_check(path, &is_goal);
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567 len = ext4_path_check(path, &is_goal);
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570 /*If root open was request.*/
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571 if(is_goal && !file_expect)
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578 r = ext4_dir_find_entry(&result, &ref, path, len);
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584 if(!(f->flags & O_CREAT))
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587 /*O_CREAT allows create new entry*/
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588 struct ext4_inode_ref child_ref;
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589 r = ext4_fs_alloc_inode(&mp->fs, &child_ref, is_goal ? !file_expect : true);
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593 /*Destroy last result*/
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594 ext4_dir_destroy_result(&ref, &result);
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596 /*Link with root dir.*/
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597 r = ext4_link(mp, &ref, &child_ref, path, len);
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599 /*Fali. Free new inode.*/
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600 ext4_fs_free_inode(&child_ref);
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601 /*We do not want to write new inode.
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602 But block has to be released.*/
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603 child_ref.dirty = false;
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604 ext4_fs_put_inode_ref(&child_ref);
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608 ext4_fs_put_inode_ref(&child_ref);
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614 *parent_inode = ref.index;
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616 next_inode = result.dentry->inode;
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617 inode_type = ext4_dir_entry_ll_get_inode_type(&mp->fs.sb, result.dentry);
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619 r = ext4_dir_destroy_result(&ref, &result);
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623 /*If expected file error*/
\r
624 if((inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)
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625 && !file_expect && is_goal){
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630 /*If expected directory error*/
\r
631 if((inode_type == EXT4_DIRECTORY_FILETYPE_DIR)
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632 && file_expect && is_goal){
\r
637 r = ext4_fs_put_inode_ref(&ref);
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641 r = ext4_fs_get_inode_ref(&mp->fs, next_inode, &ref);
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651 *name_off += len + 1;
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655 ext4_fs_put_inode_ref(&ref);
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661 if((f->flags & O_TRUNC) &&
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662 (inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)){
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664 ext4_block_delay_cache_flush(mp->fs.bdev, 1);
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665 /*Truncate may be IO heavy.
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666 Do it with delayed cache flush mode.*/
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667 r = ext4_fs_truncate_inode(&ref, 0);
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668 ext4_block_delay_cache_flush(mp->fs.bdev, 0);
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671 ext4_fs_put_inode_ref(&ref);
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677 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
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678 f->inode = ref.index;
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681 if(f->flags & O_APPEND)
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682 f->fpos = f->fsize;
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685 r = ext4_fs_put_inode_ref(&ref);
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689 /****************************************************************************/
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691 int ext4_fremove(const char *path)
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694 uint32_t parent_inode;
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699 struct ext4_mountpoint *mp = ext4_get_mount(path);
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701 struct ext4_inode_ref child;
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702 struct ext4_inode_ref parent;
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708 r = ext4_generic_open(&f, path, "r", true, &parent_inode, &name_off);
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710 EXT4_MP_UNLOCK(mp);
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715 r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
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717 EXT4_MP_UNLOCK(mp);
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721 /*We have file to delete. Load it.*/
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722 r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
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724 ext4_fs_put_inode_ref(&parent);
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725 EXT4_MP_UNLOCK(mp);
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730 ext4_block_delay_cache_flush(mp->fs.bdev, 1);
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731 /*Truncate may be IO heavy. Do it with delayed cache flush mode.*/
\r
732 r = ext4_fs_truncate_inode(&child, 0);
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733 ext4_block_delay_cache_flush(mp->fs.bdev, 0);
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741 len = ext4_path_check(path, &is_goal);
\r
743 /*Unlink from parent.*/
\r
744 r = ext4_unlink(mp, &parent, &child, path, len);
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748 r = ext4_fs_free_inode(&child);
\r
753 ext4_fs_put_inode_ref(&child);
\r
754 ext4_fs_put_inode_ref(&parent);
\r
755 EXT4_MP_UNLOCK(mp);
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760 int ext4_fopen (ext4_file *f, const char *path, const char *flags)
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762 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
769 r = ext4_generic_open(f, path, flags, true, 0, 0);
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770 EXT4_MP_UNLOCK(mp);
\r
774 int ext4_fclose(ext4_file *f)
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776 ext4_assert(f && f->mp);
\r
781 f->fpos = f->fsize = 0;
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785 int ext4_fread(ext4_file *f, void *buf, uint32_t size, uint32_t *rcnt)
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790 uint32_t fblock_start;
\r
791 uint32_t fblock_cnt;
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792 struct ext4_block b;
\r
793 uint8_t *u8_buf = buf;
\r
794 struct ext4_inode_ref ref;
\r
796 uint32_t sblock_end;
\r
797 uint32_t block_size;
\r
799 ext4_assert(f && f->mp);
\r
801 if(f->flags & O_WRONLY)
\r
807 EXT4_MP_LOCK(f->mp);
\r
812 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
814 EXT4_MP_UNLOCK(f->mp);
\r
819 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
822 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
823 size = size > (f->fsize - f->fpos) ? (f->fsize - f->fpos) : size;
\r
824 sblock = (f->fpos) / block_size;
\r
825 sblock_end = (f->fpos + size) / block_size;
\r
826 u = (f->fpos) % block_size;
\r
831 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
833 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
837 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
841 memcpy(u8_buf, b.data + u, ll);
\r
843 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
859 while(size >= block_size){
\r
860 while(sblock < sblock_end){
\r
861 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
868 fblock_start = fblock;
\r
871 if((fblock_start + fblock_cnt) != fblock)
\r
877 r = ext4_blocks_get_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
881 size -= block_size * fblock_cnt;
\r
882 u8_buf += block_size * fblock_cnt;
\r
883 f->fpos += block_size * fblock_cnt;
\r
886 *rcnt += block_size * fblock_cnt;
\r
888 fblock_start = fblock;
\r
893 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
897 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
901 memcpy(u8_buf, b.data , size);
\r
903 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
914 ext4_fs_put_inode_ref(&ref);
\r
915 EXT4_MP_UNLOCK(f->mp);
\r
919 int ext4_fwrite(ext4_file *f, void *buf, uint32_t size, uint32_t *wcnt)
\r
924 struct ext4_block b;
\r
925 uint8_t *u8_buf = buf;
\r
926 struct ext4_inode_ref ref;
\r
928 uint32_t sblock_end;
\r
929 uint32_t file_blocks;
\r
930 uint32_t block_size;
\r
931 uint32_t fblock_start;
\r
932 uint32_t fblock_cnt;
\r
934 ext4_assert(f && f->mp);
\r
936 if(f->flags & O_RDONLY)
\r
942 EXT4_MP_LOCK(f->mp);
\r
947 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
949 EXT4_MP_UNLOCK(f->mp);
\r
954 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
956 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
958 sblock_end = (f->fpos + size) > f->fsize ? (f->fpos + size) : f->fsize;
\r
959 sblock_end /= block_size;
\r
960 file_blocks = (f->fsize / block_size);
\r
962 if(f->fsize % block_size)
\r
965 sblock = (f->fpos) / block_size;
\r
967 u = (f->fpos) % block_size;
\r
971 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
973 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
977 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
981 memcpy(b.data + u, u8_buf, ll);
\r
984 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
999 /*Start delay cache flush mode.*/
\r
1000 r = ext4_block_delay_cache_flush(f->mp->fs.bdev, 1);
\r
1006 while(size >= block_size){
\r
1008 while(sblock < sblock_end){
\r
1009 if(sblock < file_blocks){
\r
1010 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1015 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1022 if(!fblock_start){
\r
1023 fblock_start = fblock;
\r
1026 if((fblock_start + fblock_cnt) != fblock)
\r
1032 r = ext4_blocks_set_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
1036 size -= block_size * fblock_cnt;
\r
1037 u8_buf += block_size * fblock_cnt;
\r
1038 f->fpos += block_size * fblock_cnt;
\r
1041 *wcnt += block_size * fblock_cnt;
\r
1043 fblock_start = fblock;
\r
1047 /*Stop delay cache flush mode*/
\r
1048 ext4_block_delay_cache_flush(f->mp->fs.bdev, 0);
\r
1054 if(sblock < file_blocks){
\r
1055 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1060 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1065 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1069 memcpy(b.data, u8_buf , size);
\r
1072 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1082 if(f->fpos > f->fsize){
\r
1083 f->fsize = f->fpos;
\r
1084 ext4_inode_set_size(ref.inode, f->fsize);
\r
1089 ext4_fs_put_inode_ref(&ref);
\r
1090 EXT4_MP_UNLOCK(f->mp);
\r
1095 int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin)
\r
1099 if(offset > f->fsize)
\r
1105 if((offset + f->fpos) > f->fsize)
\r
1108 f->fpos += offset;
\r
1111 if(offset > f->fsize)
\r
1114 f->fpos = f->fsize - offset;
\r
1121 uint64_t ext4_ftell (ext4_file *f)
\r
1126 uint64_t ext4_fsize (ext4_file *f)
\r
1131 /*********************************DIRECTORY OPERATION************************/
\r
1133 int ext4_dir_rm(const char *path)
\r
1139 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1140 struct ext4_inode_ref current;
\r
1141 struct ext4_inode_ref child;
\r
1142 struct ext4_directory_iterator it;
\r
1144 uint32_t name_off;
\r
1145 uint32_t inode_up;
\r
1146 uint32_t inode_current;
\r
1147 uint32_t depth = 1;
\r
1149 bool has_children;
\r
1158 /*Check if exist.*/
\r
1159 r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
\r
1161 EXT4_MP_UNLOCK(mp);
\r
1166 len = ext4_path_check(path, &is_goal);
\r
1168 inode_current = f.inode;
\r
1171 ext4_block_delay_cache_flush(mp->fs.bdev, 1);
\r
1174 /*Load directory node.*/
\r
1175 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current, ¤t);
\r
1180 /*Initialize iterator.*/
\r
1181 r = ext4_dir_iterator_init(&it, ¤t, 0);
\r
1183 ext4_fs_put_inode_ref(¤t);
\r
1194 /*Get up directory inode when ".." entry*/
\r
1195 if((it.current->name_length == 2) &&
\r
1196 ext4_is_dots(it.current->name, it.current->name_length)){
\r
1197 inode_up = it.current->inode;
\r
1200 /*If directory or file entry, but not "." ".." entry*/
\r
1201 if(!ext4_is_dots(it.current->name, it.current->name_length)){
\r
1203 /*Get child inode reference do unlink directory/file.*/
\r
1204 r = ext4_fs_get_inode_ref(&f.mp->fs, it.current->inode, &child);
\r
1208 /*If directory with no leaf children*/
\r
1209 r = ext4_has_children(&has_children, &child);
\r
1211 ext4_fs_put_inode_ref(&child);
\r
1216 /*Has directory children. Go into this tirectory.*/
\r
1217 inode_up = inode_current;
\r
1218 inode_current = it.current->inode;
\r
1220 ext4_fs_put_inode_ref(&child);
\r
1224 /*Directory is empty. Truncate it.*/
\r
1225 r = ext4_fs_truncate_inode(&child, 0);
\r
1227 ext4_fs_put_inode_ref(&child);
\r
1231 /*No children in child directory or file. Just unlink.*/
\r
1232 r = ext4_unlink(f.mp, ¤t, &child,
\r
1233 (char *)it.current->name, it.current->name_length);
\r
1235 ext4_fs_put_inode_ref(&child);
\r
1239 r = ext4_fs_free_inode(&child);
\r
1241 ext4_fs_put_inode_ref(&child);
\r
1245 r = ext4_fs_put_inode_ref(&child);
\r
1250 r = ext4_dir_iterator_next(&it);
\r
1254 /*Directory iterator reached last entry*/
\r
1255 ext4_has_children(&has_children, ¤t);
\r
1256 if(!has_children){
\r
1257 inode_current = inode_up;
\r
1264 struct ext4_inode_ref parent;
\r
1265 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up, &parent);
\r
1269 r = ext4_fs_truncate_inode(¤t, 0);
\r
1271 ext4_fs_put_inode_ref(&parent);
\r
1275 /* In this place all directories should be unlinked.
\r
1276 * Last unlink from root of current directory*/
\r
1277 r = ext4_unlink(f.mp, &parent, ¤t, (char *)path, len);
\r
1279 ext4_fs_put_inode_ref(&parent);
\r
1283 r = ext4_fs_free_inode(¤t);
\r
1285 ext4_fs_put_inode_ref(&parent);
\r
1289 r = ext4_fs_put_inode_ref(&parent);
\r
1296 ext4_dir_iterator_fini(&it);
\r
1297 ext4_fs_put_inode_ref(¤t);
\r
1300 /*When something goes wrong. End loop.*/
\r
1306 ext4_block_delay_cache_flush(mp->fs.bdev, 0);
\r
1307 EXT4_MP_UNLOCK(mp);
\r
1311 int ext4_dir_mk(const char *path)
\r
1316 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1323 /*Check if exist.*/
\r
1324 r = ext4_generic_open(&f, path, "r", false, 0, 0);
\r
1326 /*Directory already created*/
\r
1327 EXT4_MP_UNLOCK(mp);
\r
1331 /*Create new dir*/
\r
1332 r = ext4_generic_open(&f, path, "w", false, 0, 0);
\r
1334 EXT4_MP_UNLOCK(mp);
\r
1338 EXT4_MP_UNLOCK(mp);
\r
1342 int ext4_dir_open (ext4_dir *d, const char *path)
\r
1344 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1351 r = ext4_generic_open(&d->f, path, "r", false, 0, 0);
\r
1352 EXT4_MP_UNLOCK(mp);
\r
1356 int ext4_dir_close(ext4_dir *d)
\r
1358 return ext4_fclose(&d->f);
\r
1361 ext4_direntry* ext4_dir_entry_get(ext4_dir *d, uint32_t id)
\r
1365 ext4_direntry *de = 0;
\r
1366 struct ext4_inode_ref dir;
\r
1367 struct ext4_directory_iterator it;
\r
1369 EXT4_MP_LOCK(d->f.mp);
\r
1371 r = ext4_fs_get_inode_ref(&d->f.mp->fs, d->f.inode, &dir);
\r
1376 r = ext4_dir_iterator_init(&it, &dir, 0);
\r
1378 ext4_fs_put_inode_ref(&dir);
\r
1389 memcpy(&d->de, it.current, sizeof(ext4_direntry));
\r
1395 r = ext4_dir_iterator_next(&it);
\r
1398 ext4_dir_iterator_fini(&it);
\r
1399 ext4_fs_put_inode_ref(&dir);
\r
1402 EXT4_MP_UNLOCK(d->f.mp);
\r