2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
\r
3 * All rights reserved.
\r
5 * Redistribution and use in source and binary forms, with or without
\r
6 * modification, are permitted provided that the following conditions
\r
9 * - Redistributions of source code must retain the above copyright
\r
10 * notice, this list of conditions and the following disclaimer.
\r
11 * - Redistributions in binary form must reproduce the above copyright
\r
12 * notice, this list of conditions and the following disclaimer in the
\r
13 * documentation and/or other materials provided with the distribution.
\r
14 * - The name of the author may not be used to endorse or promote products
\r
15 * derived from this software without specific prior written permission.
\r
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
\r
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
\r
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
\r
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
\r
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
\r
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
\r
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
\r
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
\r
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
\r
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\r
29 /** @addtogroup lwext4
\r
34 * @brief Ext4 high level operations (file, directory, mountpoints...)
\r
37 #include <ext4_config.h>
\r
38 #include <ext4_blockdev.h>
\r
39 #include <ext4_types.h>
\r
40 #include <ext4_debug.h>
\r
41 #include <ext4_errno.h>
\r
42 #include <ext4_fs.h>
\r
43 #include <ext4_dir.h>
\r
44 #include <ext4_inode.h>
\r
45 #include <ext4_super.h>
\r
46 #include <ext4_dir_idx.h>
\r
53 /**@brief Mount point OS dependent lock*/
\r
54 #define EXT4_MP_LOCK(_m) \
\r
55 do { if((_m)->os_locks) (_m)->os_locks->lock(); }while(0)
\r
57 /**@brief Mount point OS dependent unlock*/
\r
58 #define EXT4_MP_UNLOCK(_m) \
\r
59 do { if((_m)->os_locks) (_m)->os_locks->unlock(); }while(0)
\r
61 /**@brief Mount point descrpitor.*/
\r
62 struct ext4_mountpoint {
\r
64 /**@brief Mount done flag.*/
\r
67 /**@brief Mount point name (@ref ext4_mount)*/
\r
70 /**@brief Os dependent lock/unlock functions.*/
\r
71 const struct ext4_lock *os_locks;
\r
73 /**@brief Ext4 filesystem internals.*/
\r
76 /**@brief Dynamic alocation cache flag.*/
\r
80 /**@brief Block devices descriptor.*/
\r
81 struct _ext4_devices {
\r
83 /**@brief Block device name (@ref ext4_device_register)*/
\r
86 /**@brief Block device handle.*/
\r
87 struct ext4_blockdev *bd;
\r
89 /**@brief Block cache handle.*/
\r
90 struct ext4_bcache *bc;
\r
93 /**@brief Block devices.*/
\r
94 struct _ext4_devices _bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
\r
97 /**@brief Mountpoints.*/
\r
98 struct ext4_mountpoint _mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
\r
101 int ext4_device_register(struct ext4_blockdev *bd, struct ext4_bcache *bc,
\r
102 const char *dev_name)
\r
105 ext4_assert(bd && dev_name);
\r
107 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
\r
108 if(!_bdevices[i].bd){
\r
109 strcpy(_bdevices[i].name, dev_name);
\r
110 _bdevices[i].bd = bd;
\r
111 _bdevices[i].bc = bc;
\r
115 if(!strcmp(_bdevices[i].name, dev_name))
\r
121 /****************************************************************************/
\r
124 static bool ext4_is_dots(const uint8_t *name, size_t name_size)
\r
126 if ((name_size == 1) && (name[0] == '.'))
\r
129 if ((name_size == 2) && (name[0] == '.') && (name[1] == '.'))
\r
135 static int ext4_has_children(bool *has_children, struct ext4_inode_ref *enode)
\r
137 struct ext4_fs *fs = enode->fs;
\r
139 /* Check if node is directory */
\r
140 if (!ext4_inode_is_type(&fs->sb, enode->inode,
\r
141 EXT4_INODE_MODE_DIRECTORY)) {
\r
142 *has_children = false;
\r
146 struct ext4_directory_iterator it;
\r
147 int rc = ext4_dir_iterator_init(&it, enode, 0);
\r
151 /* Find a non-empty directory entry */
\r
152 bool found = false;
\r
153 while (it.current != NULL) {
\r
154 if (it.current->inode != 0) {
\r
155 uint16_t name_size =
\r
156 ext4_dir_entry_ll_get_name_length(&fs->sb,
\r
158 if (!ext4_is_dots(it.current->name, name_size)) {
\r
164 rc = ext4_dir_iterator_next(&it);
\r
166 ext4_dir_iterator_fini(&it);
\r
171 rc = ext4_dir_iterator_fini(&it);
\r
175 *has_children = found;
\r
181 static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
\r
182 struct ext4_inode_ref *child, const char *name, uint32_t name_len)
\r
184 /* Check maximum name length */
\r
185 if(name_len > EXT4_DIRECTORY_FILENAME_LEN)
\r
188 /* Add entry to parent directory */
\r
189 int rc = ext4_dir_add_entry(parent, name, name_len,
\r
194 /* Fill new dir -> add '.' and '..' entries */
\r
195 if (ext4_inode_is_type(&mp->fs.sb, child->inode,
\r
196 EXT4_INODE_MODE_DIRECTORY)) {
\r
197 rc = ext4_dir_add_entry(child, ".", strlen("."),
\r
200 ext4_dir_remove_entry(parent, name, strlen(name));
\r
204 rc = ext4_dir_add_entry(child, "..", strlen(".."),
\r
207 ext4_dir_remove_entry(parent, name, strlen(name));
\r
208 ext4_dir_remove_entry(child, ".", strlen("."));
\r
212 /*New empty directory. Two links (. and ..) */
\r
213 ext4_inode_set_links_count(child->inode, 2);
\r
215 #if CONFIG_DIR_INDEX_ENABLE
\r
216 /* Initialize directory index if supported */
\r
217 if (ext4_sb_has_feature_compatible(&mp->fs.sb,
\r
218 EXT4_FEATURE_COMPAT_DIR_INDEX)) {
\r
219 rc = ext4_dir_dx_init(child);
\r
223 ext4_inode_set_flag(child->inode,
\r
224 EXT4_INODE_FLAG_INDEX);
\r
225 child->dirty = true;
\r
229 ext4_fs_inode_links_count_inc(parent);
\r
230 child->dirty = true;
\r
231 parent->dirty = true;
\r
238 static int ext4_unlink(struct ext4_mountpoint *mp,
\r
239 struct ext4_inode_ref *parent, struct ext4_inode_ref *child_inode_ref,
\r
240 const char *name, uint32_t name_len)
\r
243 int rc = ext4_has_children(&has_children, child_inode_ref);
\r
247 /* Cannot unlink non-empty node */
\r
251 /* Remove entry from parent directory */
\r
252 rc = ext4_dir_remove_entry(parent, name, name_len);
\r
256 bool is_dir = ext4_inode_is_type(&mp->fs.sb, child_inode_ref->inode,
\r
257 EXT4_INODE_MODE_DIRECTORY);
\r
259 /* If directory - handle links from parent */
\r
261 ext4_assert(ext4_inode_get_links_count(child_inode_ref->inode) == 1);
\r
262 ext4_fs_inode_links_count_dec(parent);
\r
263 parent->dirty = true;
\r
267 * TODO: Update timestamps of the parent
\r
268 * (when we have wall-clock time).
\r
270 * ext4_inode_set_change_inode_time(parent->inode, (uint32_t) now);
\r
271 * ext4_inode_set_modification_time(parent->inode, (uint32_t) now);
\r
272 * parent->dirty = true;
\r
276 * TODO: Update timestamp for inode.
\r
278 * ext4_inode_set_change_inode_time(child_inode_ref->inode,
\r
281 ext4_inode_set_deletion_time(child_inode_ref->inode, 0xFFFFFFFF);
\r
282 ext4_inode_set_links_count(child_inode_ref->inode, 0);
\r
283 child_inode_ref->dirty = true;
\r
289 /****************************************************************************/
\r
291 int ext4_mount(const char * dev_name, char *mount_point)
\r
293 ext4_assert(mount_point && dev_name);
\r
298 struct ext4_blockdev *bd = 0;
\r
299 struct ext4_bcache *bc = 0;
\r
300 struct ext4_mountpoint *mp = 0;
\r
302 if(mount_point[strlen(mount_point) - 1] != '/')
\r
305 for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
\r
306 if(_bdevices[i].name){
\r
307 if(!strcmp(dev_name, _bdevices[i].name)){
\r
308 bd = _bdevices[i].bd;
\r
309 bc = _bdevices[i].bc;
\r
318 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
\r
319 if(!_mp[i].mounted){
\r
320 strcpy(_mp[i].name, mount_point);
\r
321 _mp[i].mounted = 1;
\r
326 if(!strcmp(_mp[i].name, mount_point)){
\r
334 r = ext4_block_init(bd);
\r
338 r = ext4_fs_init(&mp->fs, bd);
\r
340 ext4_block_fini(bd);
\r
344 bsize = ext4_sb_get_block_size(&mp->fs.sb);
\r
345 ext4_block_set_lb_size(bd, bsize);
\r
347 mp->cache_dynamic = 0;
\r
350 /*Automatic block cache alloc.*/
\r
351 mp->cache_dynamic = 1;
\r
352 bc = malloc(sizeof(struct ext4_bcache));
\r
354 r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
\r
357 ext4_block_fini(bd);
\r
362 if(bsize != bc->itemsize)
\r
365 /*Bind block cache to block device*/
\r
366 r = ext4_block_bind_bcache(bd, bc);
\r
368 ext4_block_fini(bd);
\r
369 if(mp->cache_dynamic){
\r
370 ext4_bcache_fini_dynamic(bc);
\r
380 int ext4_umount(char *mount_point)
\r
384 struct ext4_mountpoint *mp = 0;
\r
386 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
\r
387 if(!strcmp(_mp[i].name, mount_point)){
\r
396 r = ext4_fs_fini(&mp->fs);
\r
402 if(mp->cache_dynamic){
\r
403 ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
\r
404 free(mp->fs.bdev->bc);
\r
407 return ext4_block_fini(mp->fs.bdev);
\r
410 int ext4_mount_point_stats(const char *mount_point,
\r
411 struct ext4_mount_stats *stats)
\r
414 struct ext4_mountpoint *mp = 0;
\r
416 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
\r
417 if(!strcmp(_mp[i].name, mount_point)){
\r
426 stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
\r
427 stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
\r
428 stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
\r
429 stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
\r
430 stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
\r
432 stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
\r
433 stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
\r
434 stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
\r
436 memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
\r
437 EXT4_MP_UNLOCK(mp);
\r
442 int ext4_mount_setup_locks(const char * mount_point,
\r
443 const struct ext4_lock *locks)
\r
446 struct ext4_mountpoint *mp = 0;
\r
448 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
\r
449 if(!strcmp(_mp[i].name, mount_point)){
\r
457 mp->os_locks = locks;
\r
461 /********************************FILE OPERATIONS*****************************/
\r
463 static struct ext4_mountpoint* ext4_get_mount(const char *path)
\r
466 for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
\r
468 if(!_mp[i].mounted)
\r
471 if(!strncmp(_mp[i].name, path, strlen(_mp[i].name)))
\r
477 static int ext4_path_check(const char *path, bool* is_goal)
\r
481 for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
\r
483 if(path[i] == '/'){
\r
497 static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
\r
502 if(!strcmp(flags, "r") || !strcmp(flags, "rb")){
\r
503 *file_flags = O_RDONLY;
\r
507 if(!strcmp(flags, "w") || !strcmp(flags, "wb")){
\r
508 *file_flags = O_WRONLY | O_CREAT | O_TRUNC;
\r
512 if(!strcmp(flags, "a") || !strcmp(flags, "ab")){
\r
513 *file_flags = O_WRONLY | O_CREAT | O_APPEND;
\r
517 if(!strcmp(flags, "r+") || !strcmp(flags, "rb+") || !strcmp(flags, "r+b")){
\r
518 *file_flags = O_RDWR;
\r
522 if(!strcmp(flags, "w+") || !strcmp(flags, "wb+") || !strcmp(flags, "w+b")){
\r
523 *file_flags = O_RDWR | O_CREAT | O_TRUNC;
\r
527 if(!strcmp(flags, "a+") || !strcmp(flags, "ab+") || !strcmp(flags, "a+b")){
\r
528 *file_flags = O_RDWR | O_CREAT | O_APPEND;
\r
535 /****************************************************************************/
\r
537 static int ext4_generic_open (ext4_file *f, const char *path,
\r
538 const char *flags, bool file_expect, uint32_t *parent_inode, uint32_t *name_off)
\r
540 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
541 struct ext4_directory_search_result result;
\r
542 struct ext4_inode_ref ref;
\r
543 bool is_goal = false;
\r
544 uint8_t inode_type = EXT4_DIRECTORY_FILETYPE_DIR;
\r
546 uint32_t next_inode;
\r
553 if(ext4_parse_flags(flags, &f->flags) == false)
\r
556 /*Skip mount point*/
\r
557 path += strlen(mp->name);
\r
560 *name_off = strlen(mp->name);
\r
563 r = ext4_fs_get_inode_ref(&mp->fs, EXT4_INODE_ROOT_INDEX, &ref);
\r
569 *parent_inode = ref.index;
\r
571 int len = ext4_path_check(path, &is_goal);
\r
575 len = ext4_path_check(path, &is_goal);
\r
578 /*If root open was request.*/
\r
579 if(is_goal && !file_expect)
\r
586 r = ext4_dir_find_entry(&result, &ref, path, len);
\r
592 if(!(f->flags & O_CREAT))
\r
595 /*O_CREAT allows create new entry*/
\r
596 struct ext4_inode_ref child_ref;
\r
597 r = ext4_fs_alloc_inode(&mp->fs, &child_ref, is_goal ? !file_expect : true);
\r
601 /*Destroy last result*/
\r
602 ext4_dir_destroy_result(&ref, &result);
\r
604 /*Link with root dir.*/
\r
605 r = ext4_link(mp, &ref, &child_ref, path, len);
\r
607 /*Fali. Free new inode.*/
\r
608 ext4_fs_free_inode(&child_ref);
\r
609 /*We do not want to write new inode.
\r
610 But block has to be released.*/
\r
611 child_ref.dirty = false;
\r
612 ext4_fs_put_inode_ref(&child_ref);
\r
616 ext4_fs_put_inode_ref(&child_ref);
\r
622 *parent_inode = ref.index;
\r
624 next_inode = result.dentry->inode;
\r
625 inode_type = ext4_dir_entry_ll_get_inode_type(&mp->fs.sb, result.dentry);
\r
627 r = ext4_dir_destroy_result(&ref, &result);
\r
631 /*If expected file error*/
\r
632 if((inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)
\r
633 && !file_expect && is_goal){
\r
638 /*If expected directory error*/
\r
639 if((inode_type == EXT4_DIRECTORY_FILETYPE_DIR)
\r
640 && file_expect && is_goal){
\r
645 r = ext4_fs_put_inode_ref(&ref);
\r
649 r = ext4_fs_get_inode_ref(&mp->fs, next_inode, &ref);
\r
659 *name_off += len + 1;
\r
663 ext4_fs_put_inode_ref(&ref);
\r
669 if((f->flags & O_TRUNC) &&
\r
670 (inode_type == EXT4_DIRECTORY_FILETYPE_REG_FILE)){
\r
672 r = ext4_fs_truncate_inode(&ref, 0);
\r
674 ext4_fs_put_inode_ref(&ref);
\r
680 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
681 f->inode = ref.index;
\r
684 if(f->flags & O_APPEND)
\r
685 f->fpos = f->fsize;
\r
688 r = ext4_fs_put_inode_ref(&ref);
\r
692 /****************************************************************************/
\r
694 int ext4_cache_write_back(const char *path, bool on)
\r
696 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
702 ext4_block_cache_write_back(mp->fs.bdev, on);
\r
703 EXT4_MP_UNLOCK(mp);
\r
708 int ext4_fremove(const char *path)
\r
711 uint32_t parent_inode;
\r
716 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
718 struct ext4_inode_ref child;
\r
719 struct ext4_inode_ref parent;
\r
725 r = ext4_generic_open(&f, path, "r", true, &parent_inode, &name_off);
\r
727 EXT4_MP_UNLOCK(mp);
\r
732 r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
\r
734 EXT4_MP_UNLOCK(mp);
\r
738 /*We have file to delete. Load it.*/
\r
739 r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
\r
741 ext4_fs_put_inode_ref(&parent);
\r
742 EXT4_MP_UNLOCK(mp);
\r
747 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
748 /*Truncate may be IO heavy. Do it writeback cache mode.*/
\r
749 r = ext4_fs_truncate_inode(&child, 0);
\r
750 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
758 len = ext4_path_check(path, &is_goal);
\r
760 /*Unlink from parent.*/
\r
761 r = ext4_unlink(mp, &parent, &child, path, len);
\r
765 r = ext4_fs_free_inode(&child);
\r
770 ext4_fs_put_inode_ref(&child);
\r
771 ext4_fs_put_inode_ref(&parent);
\r
772 EXT4_MP_UNLOCK(mp);
\r
776 int ext4_fopen (ext4_file *f, const char *path, const char *flags)
\r
778 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
785 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
786 r = ext4_generic_open(f, path, flags, true, 0, 0);
\r
787 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
788 EXT4_MP_UNLOCK(mp);
\r
792 int ext4_fclose(ext4_file *f)
\r
794 ext4_assert(f && f->mp);
\r
799 f->fpos = f->fsize = 0;
\r
803 int ext4_fread(ext4_file *f, void *buf, uint32_t size, uint32_t *rcnt)
\r
808 uint32_t fblock_start;
\r
809 uint32_t fblock_cnt;
\r
810 struct ext4_block b;
\r
811 uint8_t *u8_buf = buf;
\r
812 struct ext4_inode_ref ref;
\r
814 uint32_t sblock_end;
\r
815 uint32_t block_size;
\r
817 ext4_assert(f && f->mp);
\r
819 if(f->flags & O_WRONLY)
\r
825 EXT4_MP_LOCK(f->mp);
\r
830 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
832 EXT4_MP_UNLOCK(f->mp);
\r
837 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
840 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
841 size = size > (f->fsize - f->fpos) ? (f->fsize - f->fpos) : size;
\r
842 sblock = (f->fpos) / block_size;
\r
843 sblock_end = (f->fpos + size) / block_size;
\r
844 u = (f->fpos) % block_size;
\r
849 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
851 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
855 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
859 memcpy(u8_buf, b.data + u, ll);
\r
861 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
877 while(size >= block_size){
\r
878 while(sblock < sblock_end){
\r
879 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
886 fblock_start = fblock;
\r
889 if((fblock_start + fblock_cnt) != fblock)
\r
895 r = ext4_blocks_get_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
899 size -= block_size * fblock_cnt;
\r
900 u8_buf += block_size * fblock_cnt;
\r
901 f->fpos += block_size * fblock_cnt;
\r
904 *rcnt += block_size * fblock_cnt;
\r
906 fblock_start = fblock;
\r
911 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
915 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
919 memcpy(u8_buf, b.data , size);
\r
921 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
932 ext4_fs_put_inode_ref(&ref);
\r
933 EXT4_MP_UNLOCK(f->mp);
\r
937 int ext4_fwrite(ext4_file *f, void *buf, uint32_t size, uint32_t *wcnt)
\r
942 struct ext4_block b;
\r
943 uint8_t *u8_buf = buf;
\r
944 struct ext4_inode_ref ref;
\r
946 uint32_t sblock_end;
\r
947 uint32_t file_blocks;
\r
948 uint32_t block_size;
\r
949 uint32_t fblock_start;
\r
950 uint32_t fblock_cnt;
\r
952 ext4_assert(f && f->mp);
\r
954 if(f->flags & O_RDONLY)
\r
960 EXT4_MP_LOCK(f->mp);
\r
965 r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
\r
967 EXT4_MP_UNLOCK(f->mp);
\r
972 f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
\r
974 block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
\r
976 sblock_end = (f->fpos + size) > f->fsize ? (f->fpos + size) : f->fsize;
\r
977 sblock_end /= block_size;
\r
978 file_blocks = (f->fsize / block_size);
\r
980 if(f->fsize % block_size)
\r
983 sblock = (f->fpos) / block_size;
\r
985 u = (f->fpos) % block_size;
\r
989 uint32_t ll = size > (block_size - u) ? (block_size - u) : size;
\r
991 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
995 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
999 memcpy(b.data + u, u8_buf, ll);
\r
1002 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1017 /*Start write back cache mode.*/
\r
1018 r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
\r
1024 while(size >= block_size){
\r
1026 while(sblock < sblock_end){
\r
1027 if(sblock < file_blocks){
\r
1028 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1033 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1040 if(!fblock_start){
\r
1041 fblock_start = fblock;
\r
1044 if((fblock_start + fblock_cnt) != fblock)
\r
1050 r = ext4_blocks_set_direct(f->mp->fs.bdev, u8_buf, fblock_start, fblock_cnt);
\r
1054 size -= block_size * fblock_cnt;
\r
1055 u8_buf += block_size * fblock_cnt;
\r
1056 f->fpos += block_size * fblock_cnt;
\r
1059 *wcnt += block_size * fblock_cnt;
\r
1061 fblock_start = fblock;
\r
1065 /*Stop write back cache mode*/
\r
1066 ext4_block_cache_write_back(f->mp->fs.bdev, 0);
\r
1072 if(sblock < file_blocks){
\r
1073 r = ext4_fs_get_inode_data_block_index(&ref, sblock, &fblock);
\r
1078 r = ext4_fs_append_inode_block(&ref, &fblock, &sblock);
\r
1083 r = ext4_block_get(f->mp->fs.bdev, &b, fblock);
\r
1087 memcpy(b.data, u8_buf , size);
\r
1090 r = ext4_block_set(f->mp->fs.bdev, &b);
\r
1100 if(f->fpos > f->fsize){
\r
1101 f->fsize = f->fpos;
\r
1102 ext4_inode_set_size(ref.inode, f->fsize);
\r
1107 ext4_fs_put_inode_ref(&ref);
\r
1108 EXT4_MP_UNLOCK(f->mp);
\r
1113 int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin)
\r
1117 if(offset > f->fsize)
\r
1123 if((offset + f->fpos) > f->fsize)
\r
1126 f->fpos += offset;
\r
1129 if(offset > f->fsize)
\r
1132 f->fpos = f->fsize - offset;
\r
1139 uint64_t ext4_ftell (ext4_file *f)
\r
1144 uint64_t ext4_fsize (ext4_file *f)
\r
1149 /*********************************DIRECTORY OPERATION************************/
\r
1151 int ext4_dir_rm(const char *path)
\r
1157 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1158 struct ext4_inode_ref current;
\r
1159 struct ext4_inode_ref child;
\r
1160 struct ext4_directory_iterator it;
\r
1162 uint32_t name_off;
\r
1163 uint32_t inode_up;
\r
1164 uint32_t inode_current;
\r
1165 uint32_t depth = 1;
\r
1167 bool has_children;
\r
1176 /*Check if exist.*/
\r
1177 r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
\r
1179 EXT4_MP_UNLOCK(mp);
\r
1184 len = ext4_path_check(path, &is_goal);
\r
1186 inode_current = f.inode;
\r
1189 ext4_block_cache_write_back(mp->fs.bdev, 1);
\r
1192 /*Load directory node.*/
\r
1193 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current, ¤t);
\r
1198 /*Initialize iterator.*/
\r
1199 r = ext4_dir_iterator_init(&it, ¤t, 0);
\r
1201 ext4_fs_put_inode_ref(¤t);
\r
1212 /*Get up directory inode when ".." entry*/
\r
1213 if((it.current->name_length == 2) &&
\r
1214 ext4_is_dots(it.current->name, it.current->name_length)){
\r
1215 inode_up = it.current->inode;
\r
1218 /*If directory or file entry, but not "." ".." entry*/
\r
1219 if(!ext4_is_dots(it.current->name, it.current->name_length)){
\r
1221 /*Get child inode reference do unlink directory/file.*/
\r
1222 r = ext4_fs_get_inode_ref(&f.mp->fs, it.current->inode, &child);
\r
1226 /*If directory with no leaf children*/
\r
1227 r = ext4_has_children(&has_children, &child);
\r
1229 ext4_fs_put_inode_ref(&child);
\r
1234 /*Has directory children. Go into this tirectory.*/
\r
1235 inode_up = inode_current;
\r
1236 inode_current = it.current->inode;
\r
1238 ext4_fs_put_inode_ref(&child);
\r
1242 /*Directory is empty. Truncate it.*/
\r
1243 r = ext4_fs_truncate_inode(&child, 0);
\r
1245 ext4_fs_put_inode_ref(&child);
\r
1249 /*No children in child directory or file. Just unlink.*/
\r
1250 r = ext4_unlink(f.mp, ¤t, &child,
\r
1251 (char *)it.current->name, it.current->name_length);
\r
1253 ext4_fs_put_inode_ref(&child);
\r
1257 r = ext4_fs_free_inode(&child);
\r
1259 ext4_fs_put_inode_ref(&child);
\r
1263 r = ext4_fs_put_inode_ref(&child);
\r
1268 r = ext4_dir_iterator_next(&it);
\r
1272 /*Directory iterator reached last entry*/
\r
1273 ext4_has_children(&has_children, ¤t);
\r
1274 if(!has_children){
\r
1275 inode_current = inode_up;
\r
1282 struct ext4_inode_ref parent;
\r
1283 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up, &parent);
\r
1287 r = ext4_fs_truncate_inode(¤t, 0);
\r
1289 ext4_fs_put_inode_ref(&parent);
\r
1293 /* In this place all directories should be unlinked.
\r
1294 * Last unlink from root of current directory*/
\r
1295 r = ext4_unlink(f.mp, &parent, ¤t, (char *)path, len);
\r
1297 ext4_fs_put_inode_ref(&parent);
\r
1301 r = ext4_fs_free_inode(¤t);
\r
1303 ext4_fs_put_inode_ref(&parent);
\r
1307 r = ext4_fs_put_inode_ref(&parent);
\r
1314 ext4_dir_iterator_fini(&it);
\r
1315 ext4_fs_put_inode_ref(¤t);
\r
1318 /*When something goes wrong. End loop.*/
\r
1324 ext4_block_cache_write_back(mp->fs.bdev, 0);
\r
1325 EXT4_MP_UNLOCK(mp);
\r
1329 int ext4_dir_mk(const char *path)
\r
1334 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1341 /*Check if exist.*/
\r
1342 r = ext4_generic_open(&f, path, "r", false, 0, 0);
\r
1344 /*Directory already created*/
\r
1345 EXT4_MP_UNLOCK(mp);
\r
1349 /*Create new dir*/
\r
1350 r = ext4_generic_open(&f, path, "w", false, 0, 0);
\r
1352 EXT4_MP_UNLOCK(mp);
\r
1356 EXT4_MP_UNLOCK(mp);
\r
1360 int ext4_dir_open (ext4_dir *d, const char *path)
\r
1362 struct ext4_mountpoint *mp = ext4_get_mount(path);
\r
1369 r = ext4_generic_open(&d->f, path, "r", false, 0, 0);
\r
1370 EXT4_MP_UNLOCK(mp);
\r
1374 int ext4_dir_close(ext4_dir *d)
\r
1376 return ext4_fclose(&d->f);
\r
1379 ext4_direntry* ext4_dir_entry_get(ext4_dir *d, uint32_t id)
\r
1383 ext4_direntry *de = 0;
\r
1384 struct ext4_inode_ref dir;
\r
1385 struct ext4_directory_iterator it;
\r
1387 EXT4_MP_LOCK(d->f.mp);
\r
1389 r = ext4_fs_get_inode_ref(&d->f.mp->fs, d->f.inode, &dir);
\r
1394 r = ext4_dir_iterator_init(&it, &dir, 0);
\r
1396 ext4_fs_put_inode_ref(&dir);
\r
1407 memcpy(&d->de, it.current, sizeof(ext4_direntry));
\r
1413 r = ext4_dir_iterator_next(&it);
\r
1416 ext4_dir_iterator_fini(&it);
\r
1417 ext4_fs_put_inode_ref(&dir);
\r
1420 EXT4_MP_UNLOCK(d->f.mp);
\r