2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <uma.shankar@samsung.com>
5 * Manjunatha C Achar <a.manjunatha@samsung.com>
7 * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
10 * esd gmbh <www.esd-electronics.com>
11 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
13 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
14 * GRUB -- GRand Unified Bootloader
15 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
17 * ext4write : Based on generic ext4 protocol.
19 * SPDX-License-Identifier: GPL-2.0+
23 #include <ext_common.h>
27 #include <linux/stat.h>
28 #include <linux/time.h>
29 #include <asm/byteorder.h>
30 #include "ext4_common.h"
32 struct ext2_data *ext4fs_root;
33 struct ext2fs_node *ext4fs_file;
34 uint32_t *ext4fs_indir1_block;
35 int ext4fs_indir1_size;
36 int ext4fs_indir1_blkno = -1;
37 uint32_t *ext4fs_indir2_block;
38 int ext4fs_indir2_size;
39 int ext4fs_indir2_blkno = -1;
41 uint32_t *ext4fs_indir3_block;
42 int ext4fs_indir3_size;
43 int ext4fs_indir3_blkno = -1;
44 struct ext2_inode *g_parent_inode;
45 static int symlinknest;
47 #if defined(CONFIG_EXT4_WRITE)
48 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
50 uint32_t res = size / n;
57 void put_ext4(uint64_t off, void *buf, uint32_t size)
61 unsigned char *temp_ptr = NULL;
62 struct ext_filesystem *fs = get_fs();
63 int log2blksz = fs->dev_desc->log2blksz;
64 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
66 startblock = off >> log2blksz;
67 startblock += part_offset;
68 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
70 if (fs->dev_desc == NULL)
73 if ((startblock + (size >> log2blksz)) >
74 (part_offset + fs->total_sect)) {
75 printf("part_offset is " LBAFU "\n", part_offset);
76 printf("total_sector is %llu\n", fs->total_sect);
77 printf("error: overflow occurs\n");
82 if (fs->dev_desc->block_read) {
83 fs->dev_desc->block_read(fs->dev_desc->dev,
84 startblock, 1, sec_buf);
86 memcpy((temp_ptr + remainder),
87 (unsigned char *)buf, size);
88 fs->dev_desc->block_write(fs->dev_desc->dev,
89 startblock, 1, sec_buf);
92 if (size >> log2blksz != 0) {
93 fs->dev_desc->block_write(fs->dev_desc->dev,
96 (unsigned long *)buf);
98 fs->dev_desc->block_read(fs->dev_desc->dev,
99 startblock, 1, sec_buf);
101 memcpy(temp_ptr, buf, size);
102 fs->dev_desc->block_write(fs->dev_desc->dev,
104 (unsigned long *)sec_buf);
109 static int _get_new_inode_no(unsigned char *buffer)
111 struct ext_filesystem *fs = get_fs();
117 /* get the blocksize of the filesystem */
118 unsigned char *ptr = buffer;
119 while (*ptr == 255) {
122 if (count > ext4fs_root->sblock.inodes_per_group)
126 for (j = 0; j < fs->blksz; j++) {
131 status = input & operand;
146 static int _get_new_blk_no(unsigned char *buffer)
152 unsigned char *ptr = buffer;
153 struct ext_filesystem *fs = get_fs();
155 if (fs->blksz != 1024)
160 while (*ptr == 255) {
163 if (count == (fs->blksz * 8))
167 for (j = 0; j < fs->blksz; j++) {
172 status = input & operand;
187 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
189 int i, remainder, status;
190 unsigned char *ptr = buffer;
191 unsigned char operand;
193 remainder = blockno % 8;
194 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
196 i = i - (index * blocksize);
197 if (blocksize != 1024) {
199 operand = 1 << remainder;
200 status = *ptr & operand;
204 *ptr = *ptr | operand;
207 if (remainder == 0) {
212 operand = (1 << (remainder - 1));
214 status = *ptr & operand;
218 *ptr = *ptr | operand;
223 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
225 int i, remainder, status;
226 unsigned char *ptr = buffer;
227 unsigned char operand;
229 remainder = blockno % 8;
230 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
232 i = i - (index * blocksize);
233 if (blocksize != 1024) {
235 operand = (1 << remainder);
236 status = *ptr & operand;
238 *ptr = *ptr & ~(operand);
240 if (remainder == 0) {
245 operand = (1 << (remainder - 1));
247 status = *ptr & operand;
249 *ptr = *ptr & ~(operand);
253 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
255 int i, remainder, status;
256 unsigned char *ptr = buffer;
257 unsigned char operand;
259 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
261 remainder = inode_no % 8;
262 if (remainder == 0) {
267 operand = (1 << (remainder - 1));
269 status = *ptr & operand;
273 *ptr = *ptr | operand;
278 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
280 int i, remainder, status;
281 unsigned char *ptr = buffer;
282 unsigned char operand;
284 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
286 remainder = inode_no % 8;
287 if (remainder == 0) {
292 operand = (1 << (remainder - 1));
294 status = *ptr & operand;
296 *ptr = *ptr & ~(operand);
299 int ext4fs_checksum_update(unsigned int i)
301 struct ext2_block_group *desc;
302 struct ext_filesystem *fs = get_fs();
305 desc = (struct ext2_block_group *)&fs->bgd[i];
306 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
307 int offset = offsetof(struct ext2_block_group, bg_checksum);
309 crc = ext2fs_crc16(~0, fs->sb->unique_id,
310 sizeof(fs->sb->unique_id));
311 crc = ext2fs_crc16(crc, &i, sizeof(i));
312 crc = ext2fs_crc16(crc, desc, offset);
313 offset += sizeof(desc->bg_checksum); /* skip checksum */
314 assert(offset == sizeof(*desc));
320 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
323 int sizeof_void_space;
324 int new_entry_byte_reqd;
325 short padding_factor = 0;
327 if (dir->namelen % 4 != 0)
328 padding_factor = 4 - (dir->namelen % 4);
330 dentry_length = sizeof(struct ext2_dirent) +
331 dir->namelen + padding_factor;
332 sizeof_void_space = dir->direntlen - dentry_length;
333 if (sizeof_void_space == 0)
337 if (strlen(filename) % 4 != 0)
338 padding_factor = 4 - (strlen(filename) % 4);
340 new_entry_byte_reqd = strlen(filename) +
341 sizeof(struct ext2_dirent) + padding_factor;
342 if (sizeof_void_space >= new_entry_byte_reqd) {
343 dir->direntlen = dentry_length;
344 return sizeof_void_space;
350 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
352 unsigned int *zero_buffer = NULL;
353 char *root_first_block_buffer = NULL;
356 long int first_block_no_of_root = 0;
357 long int previous_blknr = -1;
359 short int padding_factor = 0;
360 unsigned int new_entry_byte_reqd;
361 unsigned int last_entry_dirlen;
362 int sizeof_void_space = 0;
366 struct ext_filesystem *fs = get_fs();
367 /* directory entry */
368 struct ext2_dirent *dir;
369 char *temp_dir = NULL;
371 zero_buffer = zalloc(fs->blksz);
373 printf("No Memory\n");
376 root_first_block_buffer = zalloc(fs->blksz);
377 if (!root_first_block_buffer) {
379 printf("No Memory\n");
384 /* read the block no allocated to a file */
385 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
387 root_blknr = read_allocated_block(g_parent_inode,
389 if (root_blknr == 0) {
390 first_block_no_of_root = previous_blknr;
393 previous_blknr = root_blknr;
396 status = ext4fs_devread((lbaint_t)first_block_no_of_root
398 0, fs->blksz, root_first_block_buffer);
402 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
404 dir = (struct ext2_dirent *)root_first_block_buffer;
406 while (dir->direntlen > 0) {
408 * blocksize-totalbytes because last directory length
409 * i.e. dir->direntlen is free availble space in the
410 * block that means it is a last entry of directory
414 /* traversing the each directory entry */
415 if (fs->blksz - totalbytes == dir->direntlen) {
416 if (strlen(filename) % 4 != 0)
417 padding_factor = 4 - (strlen(filename) % 4);
419 new_entry_byte_reqd = strlen(filename) +
420 sizeof(struct ext2_dirent) + padding_factor;
423 * update last directory entry length to its
424 * length because we are creating new directory
427 if (dir->namelen % 4 != 0)
428 padding_factor = 4 - (dir->namelen % 4);
430 last_entry_dirlen = dir->namelen +
431 sizeof(struct ext2_dirent) + padding_factor;
432 if ((fs->blksz - totalbytes - last_entry_dirlen) <
433 new_entry_byte_reqd) {
434 printf("1st Block Full:Allocate new block\n");
436 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
437 printf("Directory exceeds limit\n");
440 g_parent_inode->b.blocks.dir_blocks
441 [direct_blk_idx] = ext4fs_get_new_blk_no();
442 if (g_parent_inode->b.blocks.dir_blocks
443 [direct_blk_idx] == -1) {
444 printf("no block left to assign\n");
448 ((uint64_t)g_parent_inode->b.
449 blocks.dir_blocks[direct_blk_idx] *
450 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
451 g_parent_inode->size =
452 g_parent_inode->size + fs->blksz;
453 g_parent_inode->blockcnt =
454 g_parent_inode->blockcnt + fs->sect_perblk;
455 if (ext4fs_put_metadata
456 (root_first_block_buffer,
457 first_block_no_of_root))
461 dir->direntlen = last_entry_dirlen;
465 templength = dir->direntlen;
466 totalbytes = totalbytes + templength;
467 sizeof_void_space = check_void_in_dentry(dir, filename);
468 if (sizeof_void_space)
471 dir = (struct ext2_dirent *)((char *)dir + templength);
474 /* make a pointer ready for creating next directory entry */
475 templength = dir->direntlen;
476 totalbytes = totalbytes + templength;
477 dir = (struct ext2_dirent *)((char *)dir + templength);
479 /* get the next available inode number */
480 inodeno = ext4fs_get_new_inode_no();
482 printf("no inode left to assign\n");
485 dir->inode = inodeno;
486 if (sizeof_void_space)
487 dir->direntlen = sizeof_void_space;
489 dir->direntlen = fs->blksz - totalbytes;
491 dir->namelen = strlen(filename);
492 dir->filetype = FILETYPE_REG; /* regular file */
493 temp_dir = (char *)dir;
494 temp_dir = temp_dir + sizeof(struct ext2_dirent);
495 memcpy(temp_dir, filename, strlen(filename));
499 /* update or write the 1st block of root inode */
500 if (ext4fs_put_metadata(root_first_block_buffer,
501 first_block_no_of_root))
506 free(root_first_block_buffer);
509 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
519 unsigned char *block_buffer = NULL;
520 struct ext2_dirent *dir = NULL;
521 struct ext2_dirent *previous_dir = NULL;
522 struct ext_filesystem *fs = get_fs();
524 /* read the block no allocated to a file */
525 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
527 blknr = read_allocated_block(parent_inode, direct_blk_idx);
531 /* read the blocks of parenet inode */
532 block_buffer = zalloc(fs->blksz);
536 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
537 0, fs->blksz, (char *)block_buffer);
541 dir = (struct ext2_dirent *)block_buffer;
544 while (dir->direntlen >= 0) {
546 * blocksize-totalbytes because last directory
547 * length i.e.,*dir->direntlen is free availble
548 * space in the block that means
549 * it is a last entry of directory entry
551 if (strlen(dirname) == dir->namelen) {
552 if (strncmp(dirname, ptr +
553 sizeof(struct ext2_dirent),
554 dir->namelen) == 0) {
555 previous_dir->direntlen +=
557 inodeno = dir->inode;
564 if (fs->blksz - totalbytes == dir->direntlen)
567 /* traversing the each directory entry */
568 templength = dir->direntlen;
569 totalbytes = totalbytes + templength;
571 dir = (struct ext2_dirent *)((char *)dir + templength);
591 static int find_dir_depth(char *dirname)
593 char *token = strtok(dirname, "/");
595 while (token != NULL) {
596 token = strtok(NULL, "/");
599 return count + 1 + 1;
601 * for example for string /home/temp
602 * depth=home(1)+temp(1)+1 extra for NULL;
607 static int parse_path(char **arr, char *dirname)
609 char *token = strtok(dirname, "/");
613 arr[i] = zalloc(strlen("/") + 1);
619 /* add each path entry after root */
620 while (token != NULL) {
621 arr[i] = zalloc(strlen(token) + 1);
624 memcpy(arr[i++], token, strlen(token));
625 token = strtok(NULL, "/");
632 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
634 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
641 * Function: ext4fs_get_parent_inode_num
642 * Return Value: inode Number of the parent directory of file/Directory to be
644 * dirname : Input parmater, input path name of the file/directory to be created
645 * dname : Output parameter, to be filled with the name of the directory
646 * extracted from dirname
648 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
652 int matched_inode_no;
653 int result_inode_no = -1;
655 char *depth_dirname = NULL;
656 char *parse_dirname = NULL;
657 struct ext2_inode *parent_inode = NULL;
658 struct ext2_inode *first_inode = NULL;
659 struct ext2_inode temp_inode;
661 if (*dirname != '/') {
662 printf("Please supply Absolute path\n");
666 /* TODO: input validation make equivalent to linux */
667 depth_dirname = zalloc(strlen(dirname) + 1);
671 memcpy(depth_dirname, dirname, strlen(dirname));
672 depth = find_dir_depth(depth_dirname);
673 parse_dirname = zalloc(strlen(dirname) + 1);
676 memcpy(parse_dirname, dirname, strlen(dirname));
678 /* allocate memory for each directory level */
679 ptr = zalloc((depth) * sizeof(char *));
682 if (parse_path(ptr, parse_dirname))
684 parent_inode = zalloc(sizeof(struct ext2_inode));
687 first_inode = zalloc(sizeof(struct ext2_inode));
690 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
691 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
693 result_inode_no = EXT2_ROOT_INO;
694 for (i = 1; i < depth; i++) {
695 matched_inode_no = search_dir(parent_inode, ptr[i]);
696 if (matched_inode_no == -1) {
697 if (ptr[i + 1] == NULL && i == 1) {
698 result_inode_no = EXT2_ROOT_INO;
701 if (ptr[i + 1] == NULL)
703 printf("Invalid path\n");
704 result_inode_no = -1;
708 if (ptr[i + 1] != NULL) {
709 memset(parent_inode, '\0',
710 sizeof(struct ext2_inode));
711 if (ext4fs_iget(matched_inode_no,
713 result_inode_no = -1;
716 result_inode_no = matched_inode_no;
725 matched_inode_no = search_dir(first_inode, ptr[i]);
727 matched_inode_no = search_dir(parent_inode, ptr[i]);
729 if (matched_inode_no != -1) {
730 ext4fs_iget(matched_inode_no, &temp_inode);
731 if (temp_inode.mode & S_IFDIR) {
732 printf("It is a Directory\n");
733 result_inode_no = -1;
738 if (strlen(ptr[i]) > 256) {
739 result_inode_no = -1;
742 memcpy(dname, ptr[i], strlen(ptr[i]));
751 return result_inode_no;
754 static int check_filename(char *filename, unsigned int blknr)
756 unsigned int first_block_no_of_root;
761 char *root_first_block_buffer = NULL;
762 char *root_first_block_addr = NULL;
763 struct ext2_dirent *dir = NULL;
764 struct ext2_dirent *previous_dir = NULL;
766 struct ext_filesystem *fs = get_fs();
768 /* get the first block of root */
769 first_block_no_of_root = blknr;
770 root_first_block_buffer = zalloc(fs->blksz);
771 if (!root_first_block_buffer)
773 root_first_block_addr = root_first_block_buffer;
774 status = ext4fs_devread((lbaint_t)first_block_no_of_root *
776 fs->blksz, root_first_block_buffer);
780 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
782 dir = (struct ext2_dirent *)root_first_block_buffer;
785 while (dir->direntlen >= 0) {
787 * blocksize-totalbytes because last
788 * directory length i.e., *dir->direntlen
789 * is free availble space in the block that
790 * means it is a last entry of directory entry
792 if (strlen(filename) == dir->namelen) {
793 if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
794 dir->namelen) == 0) {
795 printf("file found deleting\n");
796 previous_dir->direntlen += dir->direntlen;
797 inodeno = dir->inode;
804 if (fs->blksz - totalbytes == dir->direntlen)
807 /* traversing the each directory entry */
808 templength = dir->direntlen;
809 totalbytes = totalbytes + templength;
811 dir = (struct ext2_dirent *)((char *)dir + templength);
817 if (ext4fs_put_metadata(root_first_block_addr,
818 first_block_no_of_root))
823 free(root_first_block_buffer);
828 int ext4fs_filename_check(char *filename)
830 short direct_blk_idx = 0;
834 /* read the block no allocated to a file */
835 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
837 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
840 inodeno = check_filename(filename, blknr);
848 long int ext4fs_get_new_blk_no(void)
854 static int prev_bg_bitmap_index = -1;
855 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
856 struct ext_filesystem *fs = get_fs();
857 char *journal_buffer = zalloc(fs->blksz);
858 char *zero_buffer = zalloc(fs->blksz);
859 if (!journal_buffer || !zero_buffer)
861 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
863 if (fs->first_pass_bbmap == 0) {
864 for (i = 0; i < fs->no_blkgrp; i++) {
865 if (bgd[i].free_blocks) {
866 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
867 put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
868 (uint64_t)fs->blksz)),
869 zero_buffer, fs->blksz);
872 bg_flags & ~EXT4_BG_BLOCK_UNINIT;
873 memcpy(fs->blk_bmaps[i], zero_buffer,
877 _get_new_blk_no(fs->blk_bmaps[i]);
878 if (fs->curr_blkno == -1)
879 /* if block bitmap is completely fill */
881 fs->curr_blkno = fs->curr_blkno +
883 fs->first_pass_bbmap++;
884 bgd[i].free_blocks--;
885 fs->sb->free_blocks--;
886 status = ext4fs_devread((lbaint_t)
893 if (ext4fs_log_journal(journal_buffer,
898 debug("no space left on block group %d\n", i);
906 /* get the blockbitmap index respective to blockno */
907 bg_idx = fs->curr_blkno / blk_per_grp;
908 if (fs->blksz == 1024) {
909 remainder = fs->curr_blkno % blk_per_grp;
915 * To skip completely filled block group bitmaps
916 * Optimize the block allocation
918 if (bg_idx >= fs->no_blkgrp)
921 if (bgd[bg_idx].free_blocks == 0) {
922 debug("block group %u is full. Skipping\n", bg_idx);
923 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
928 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
929 memset(zero_buffer, '\0', fs->blksz);
930 put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
931 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
932 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
933 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
934 ~EXT4_BG_BLOCK_UNINIT;
937 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
939 debug("going for restart for the block no %ld %u\n",
940 fs->curr_blkno, bg_idx);
945 if (prev_bg_bitmap_index != bg_idx) {
946 memset(journal_buffer, '\0', fs->blksz);
947 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
949 0, fs->blksz, journal_buffer);
952 if (ext4fs_log_journal(journal_buffer,
953 bgd[bg_idx].block_id))
956 prev_bg_bitmap_index = bg_idx;
958 bgd[bg_idx].free_blocks--;
959 fs->sb->free_blocks--;
963 free(journal_buffer);
966 return fs->curr_blkno;
968 free(journal_buffer);
974 int ext4fs_get_new_inode_no(void)
978 unsigned int ibmap_idx;
979 static int prev_inode_bitmap_index = -1;
980 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
981 struct ext_filesystem *fs = get_fs();
982 char *journal_buffer = zalloc(fs->blksz);
983 char *zero_buffer = zalloc(fs->blksz);
984 if (!journal_buffer || !zero_buffer)
986 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
988 if (fs->first_pass_ibmap == 0) {
989 for (i = 0; i < fs->no_blkgrp; i++) {
990 if (bgd[i].free_inodes) {
991 if (bgd[i].bg_itable_unused !=
993 bgd[i].bg_itable_unused =
995 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
997 ((uint64_t)bgd[i].inode_id *
998 (uint64_t)fs->blksz)),
999 zero_buffer, fs->blksz);
1000 bgd[i].bg_flags = bgd[i].bg_flags &
1001 ~EXT4_BG_INODE_UNINIT;
1002 memcpy(fs->inode_bmaps[i],
1003 zero_buffer, fs->blksz);
1006 _get_new_inode_no(fs->inode_bmaps[i]);
1007 if (fs->curr_inode_no == -1)
1008 /* if block bitmap is completely fill */
1010 fs->curr_inode_no = fs->curr_inode_no +
1011 (i * inodes_per_grp);
1012 fs->first_pass_ibmap++;
1013 bgd[i].free_inodes--;
1014 bgd[i].bg_itable_unused--;
1015 fs->sb->free_inodes--;
1016 status = ext4fs_devread((lbaint_t)
1023 if (ext4fs_log_journal(journal_buffer,
1028 debug("no inode left on block group %d\n", i);
1033 fs->curr_inode_no++;
1034 /* get the blockbitmap index respective to blockno */
1035 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1036 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1037 memset(zero_buffer, '\0', fs->blksz);
1038 put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
1039 (uint64_t)fs->blksz)), zero_buffer,
1041 bgd[ibmap_idx].bg_flags =
1042 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1043 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1047 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1048 fs->inode_bmaps[ibmap_idx],
1050 debug("going for restart for the block no %d %u\n",
1051 fs->curr_inode_no, ibmap_idx);
1055 /* journal backup */
1056 if (prev_inode_bitmap_index != ibmap_idx) {
1057 memset(journal_buffer, '\0', fs->blksz);
1058 status = ext4fs_devread((lbaint_t)
1059 bgd[ibmap_idx].inode_id
1061 0, fs->blksz, journal_buffer);
1064 if (ext4fs_log_journal(journal_buffer,
1065 bgd[ibmap_idx].inode_id))
1067 prev_inode_bitmap_index = ibmap_idx;
1069 if (bgd[ibmap_idx].bg_itable_unused !=
1070 bgd[ibmap_idx].free_inodes)
1071 bgd[ibmap_idx].bg_itable_unused =
1072 bgd[ibmap_idx].free_inodes;
1073 bgd[ibmap_idx].free_inodes--;
1074 bgd[ibmap_idx].bg_itable_unused--;
1075 fs->sb->free_inodes--;
1080 free(journal_buffer);
1083 return fs->curr_inode_no;
1085 free(journal_buffer);
1093 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1094 unsigned int *total_remaining_blocks,
1095 unsigned int *no_blks_reqd)
1099 long int actual_block_no;
1100 long int si_blockno;
1101 /* si :single indirect */
1102 unsigned int *si_buffer = NULL;
1103 unsigned int *si_start_addr = NULL;
1104 struct ext_filesystem *fs = get_fs();
1106 if (*total_remaining_blocks != 0) {
1107 si_buffer = zalloc(fs->blksz);
1109 printf("No Memory\n");
1112 si_start_addr = si_buffer;
1113 si_blockno = ext4fs_get_new_blk_no();
1114 if (si_blockno == -1) {
1115 printf("no block left to assign\n");
1119 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1121 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1122 0, fs->blksz, (char *)si_buffer);
1123 memset(si_buffer, '\0', fs->blksz);
1127 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1128 actual_block_no = ext4fs_get_new_blk_no();
1129 if (actual_block_no == -1) {
1130 printf("no block left to assign\n");
1133 *si_buffer = actual_block_no;
1134 debug("SIAB %u: %u\n", *si_buffer,
1135 *total_remaining_blocks);
1138 (*total_remaining_blocks)--;
1139 if (*total_remaining_blocks == 0)
1143 /* write the block to disk */
1144 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1145 si_start_addr, fs->blksz);
1146 file_inode->b.blocks.indir_block = si_blockno;
1149 free(si_start_addr);
1152 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1153 unsigned int *total_remaining_blocks,
1154 unsigned int *no_blks_reqd)
1159 long int actual_block_no;
1160 /* di:double indirect */
1161 long int di_blockno_parent;
1162 long int di_blockno_child;
1163 unsigned int *di_parent_buffer = NULL;
1164 unsigned int *di_child_buff = NULL;
1165 unsigned int *di_block_start_addr = NULL;
1166 unsigned int *di_child_buff_start = NULL;
1167 struct ext_filesystem *fs = get_fs();
1169 if (*total_remaining_blocks != 0) {
1170 /* double indirect parent block connecting to inode */
1171 di_blockno_parent = ext4fs_get_new_blk_no();
1172 if (di_blockno_parent == -1) {
1173 printf("no block left to assign\n");
1176 di_parent_buffer = zalloc(fs->blksz);
1177 if (!di_parent_buffer)
1180 di_block_start_addr = di_parent_buffer;
1182 debug("DIPB %ld: %u\n", di_blockno_parent,
1183 *total_remaining_blocks);
1185 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1187 fs->blksz, (char *)di_parent_buffer);
1190 printf("%s: Device read error!\n", __func__);
1193 memset(di_parent_buffer, '\0', fs->blksz);
1196 * start:for each double indirect parent
1197 * block create one more block
1199 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1200 di_blockno_child = ext4fs_get_new_blk_no();
1201 if (di_blockno_child == -1) {
1202 printf("no block left to assign\n");
1205 di_child_buff = zalloc(fs->blksz);
1209 di_child_buff_start = di_child_buff;
1210 *di_parent_buffer = di_blockno_child;
1213 debug("DICB %ld: %u\n", di_blockno_child,
1214 *total_remaining_blocks);
1216 status = ext4fs_devread((lbaint_t)di_blockno_child *
1219 (char *)di_child_buff);
1222 printf("%s: Device read error!\n", __func__);
1225 memset(di_child_buff, '\0', fs->blksz);
1226 /* filling of actual datablocks for each child */
1227 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1228 actual_block_no = ext4fs_get_new_blk_no();
1229 if (actual_block_no == -1) {
1230 printf("no block left to assign\n");
1233 *di_child_buff = actual_block_no;
1234 debug("DIAB %ld: %u\n", actual_block_no,
1235 *total_remaining_blocks);
1238 (*total_remaining_blocks)--;
1239 if (*total_remaining_blocks == 0)
1242 /* write the block table */
1243 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1244 di_child_buff_start, fs->blksz);
1245 free(di_child_buff_start);
1246 di_child_buff_start = NULL;
1248 if (*total_remaining_blocks == 0)
1251 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1252 di_block_start_addr, fs->blksz);
1253 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1256 free(di_block_start_addr);
1259 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1260 unsigned int *total_remaining_blocks,
1261 unsigned int *no_blks_reqd)
1266 long int actual_block_no;
1267 /* ti: Triple Indirect */
1268 long int ti_gp_blockno;
1269 long int ti_parent_blockno;
1270 long int ti_child_blockno;
1271 unsigned int *ti_gp_buff = NULL;
1272 unsigned int *ti_parent_buff = NULL;
1273 unsigned int *ti_child_buff = NULL;
1274 unsigned int *ti_gp_buff_start_addr = NULL;
1275 unsigned int *ti_pbuff_start_addr = NULL;
1276 unsigned int *ti_cbuff_start_addr = NULL;
1277 struct ext_filesystem *fs = get_fs();
1278 if (*total_remaining_blocks != 0) {
1279 /* triple indirect grand parent block connecting to inode */
1280 ti_gp_blockno = ext4fs_get_new_blk_no();
1281 if (ti_gp_blockno == -1) {
1282 printf("no block left to assign\n");
1285 ti_gp_buff = zalloc(fs->blksz);
1289 ti_gp_buff_start_addr = ti_gp_buff;
1291 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1292 *total_remaining_blocks);
1294 /* for each 4 byte grand parent entry create one more block */
1295 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1296 ti_parent_blockno = ext4fs_get_new_blk_no();
1297 if (ti_parent_blockno == -1) {
1298 printf("no block left to assign\n");
1301 ti_parent_buff = zalloc(fs->blksz);
1302 if (!ti_parent_buff)
1305 ti_pbuff_start_addr = ti_parent_buff;
1306 *ti_gp_buff = ti_parent_blockno;
1309 debug("TIPB %ld: %u\n", ti_parent_blockno,
1310 *total_remaining_blocks);
1312 /* for each 4 byte entry parent create one more block */
1313 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1314 ti_child_blockno = ext4fs_get_new_blk_no();
1315 if (ti_child_blockno == -1) {
1316 printf("no block left assign\n");
1319 ti_child_buff = zalloc(fs->blksz);
1323 ti_cbuff_start_addr = ti_child_buff;
1324 *ti_parent_buff = ti_child_blockno;
1327 debug("TICB %ld: %u\n", ti_parent_blockno,
1328 *total_remaining_blocks);
1330 /* fill actual datablocks for each child */
1331 for (k = 0; k < (fs->blksz / sizeof(int));
1334 ext4fs_get_new_blk_no();
1335 if (actual_block_no == -1) {
1336 printf("no block left\n");
1339 *ti_child_buff = actual_block_no;
1340 debug("TIAB %ld: %u\n", actual_block_no,
1341 *total_remaining_blocks);
1344 (*total_remaining_blocks)--;
1345 if (*total_remaining_blocks == 0)
1348 /* write the child block */
1349 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1350 (uint64_t)fs->blksz)),
1351 ti_cbuff_start_addr, fs->blksz);
1352 free(ti_cbuff_start_addr);
1354 if (*total_remaining_blocks == 0)
1357 /* write the parent block */
1358 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1359 ti_pbuff_start_addr, fs->blksz);
1360 free(ti_pbuff_start_addr);
1362 if (*total_remaining_blocks == 0)
1365 /* write the grand parent block */
1366 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1367 ti_gp_buff_start_addr, fs->blksz);
1368 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1371 free(ti_gp_buff_start_addr);
1374 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1375 unsigned int total_remaining_blocks,
1376 unsigned int *total_no_of_block)
1379 long int direct_blockno;
1380 unsigned int no_blks_reqd = 0;
1382 /* allocation of direct blocks */
1383 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1384 direct_blockno = ext4fs_get_new_blk_no();
1385 if (direct_blockno == -1) {
1386 printf("no block left to assign\n");
1389 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1390 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1392 total_remaining_blocks--;
1395 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1397 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1399 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1401 *total_no_of_block += no_blks_reqd;
1406 static struct ext4_extent_header *ext4fs_get_extent_block
1407 (struct ext2_data *data, char *buf,
1408 struct ext4_extent_header *ext_block,
1409 uint32_t fileblock, int log2_blksz)
1411 struct ext4_extent_idx *index;
1412 unsigned long long block;
1413 int blksz = EXT2_BLOCK_SIZE(data);
1417 index = (struct ext4_extent_idx *)(ext_block + 1);
1419 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1422 if (ext_block->eh_depth == 0)
1427 if (i >= le16_to_cpu(ext_block->eh_entries))
1429 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1434 block = le16_to_cpu(index[i].ei_leaf_hi);
1435 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1437 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1439 ext_block = (struct ext4_extent_header *)buf;
1445 static int ext4fs_blockgroup
1446 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1449 unsigned int blkoff, desc_per_blk;
1450 int log2blksz = get_fs()->dev_desc->log2blksz;
1452 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1454 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1455 group / desc_per_blk;
1456 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1458 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1459 group, blkno, blkoff);
1461 return ext4fs_devread((lbaint_t)blkno <<
1462 (LOG2_BLOCK_SIZE(data) - log2blksz),
1463 blkoff, sizeof(struct ext2_block_group),
1467 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1469 struct ext2_block_group blkgrp;
1470 struct ext2_sblock *sblock = &data->sblock;
1471 struct ext_filesystem *fs = get_fs();
1472 int log2blksz = get_fs()->dev_desc->log2blksz;
1473 int inodes_per_block, status;
1475 unsigned int blkoff;
1477 /* It is easier to calculate if the first inode is 0. */
1479 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1480 (sblock->inodes_per_group), &blkgrp);
1484 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1485 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1486 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1487 blkoff = (ino % inodes_per_block) * fs->inodesz;
1488 /* Read the inode. */
1489 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1491 sizeof(struct ext2_inode), (char *)inode);
1498 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1505 long int perblock_parent;
1506 long int perblock_child;
1507 unsigned long long start;
1508 /* get the blocksize of the filesystem */
1509 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1510 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1511 - get_fs()->dev_desc->log2blksz;
1513 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1514 char *buf = zalloc(blksz);
1517 struct ext4_extent_header *ext_block;
1518 struct ext4_extent *extent;
1521 ext4fs_get_extent_block(ext4fs_root, buf,
1522 (struct ext4_extent_header *)
1523 inode->b.blocks.dir_blocks,
1524 fileblock, log2_blksz);
1526 printf("invalid extent block\n");
1531 extent = (struct ext4_extent *)(ext_block + 1);
1535 if (i >= le16_to_cpu(ext_block->eh_entries))
1537 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1539 fileblock -= le32_to_cpu(extent[i].ee_block);
1540 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1545 start = le16_to_cpu(extent[i].ee_start_hi);
1546 start = (start << 32) +
1547 le32_to_cpu(extent[i].ee_start_lo);
1549 return fileblock + start;
1552 printf("Extent Error\n");
1557 /* Direct blocks. */
1558 if (fileblock < INDIRECT_BLOCKS)
1559 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1562 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1563 if (ext4fs_indir1_block == NULL) {
1564 ext4fs_indir1_block = zalloc(blksz);
1565 if (ext4fs_indir1_block == NULL) {
1566 printf("** SI ext2fs read block (indir 1)"
1567 "malloc failed. **\n");
1570 ext4fs_indir1_size = blksz;
1571 ext4fs_indir1_blkno = -1;
1573 if (blksz != ext4fs_indir1_size) {
1574 free(ext4fs_indir1_block);
1575 ext4fs_indir1_block = NULL;
1576 ext4fs_indir1_size = 0;
1577 ext4fs_indir1_blkno = -1;
1578 ext4fs_indir1_block = zalloc(blksz);
1579 if (ext4fs_indir1_block == NULL) {
1580 printf("** SI ext2fs read block (indir 1):"
1581 "malloc failed. **\n");
1584 ext4fs_indir1_size = blksz;
1586 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1587 log2_blksz) != ext4fs_indir1_blkno) {
1589 ext4fs_devread((lbaint_t)__le32_to_cpu
1591 indir_block) << log2_blksz, 0,
1592 blksz, (char *)ext4fs_indir1_block);
1594 printf("** SI ext2fs read block (indir 1)"
1598 ext4fs_indir1_blkno =
1599 __le32_to_cpu(inode->b.blocks.
1600 indir_block) << log2_blksz;
1602 blknr = __le32_to_cpu(ext4fs_indir1_block
1603 [fileblock - INDIRECT_BLOCKS]);
1605 /* Double indirect. */
1606 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1607 (blksz / 4 + 1)))) {
1609 long int perblock = blksz / 4;
1610 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1612 if (ext4fs_indir1_block == NULL) {
1613 ext4fs_indir1_block = zalloc(blksz);
1614 if (ext4fs_indir1_block == NULL) {
1615 printf("** DI ext2fs read block (indir 2 1)"
1616 "malloc failed. **\n");
1619 ext4fs_indir1_size = blksz;
1620 ext4fs_indir1_blkno = -1;
1622 if (blksz != ext4fs_indir1_size) {
1623 free(ext4fs_indir1_block);
1624 ext4fs_indir1_block = NULL;
1625 ext4fs_indir1_size = 0;
1626 ext4fs_indir1_blkno = -1;
1627 ext4fs_indir1_block = zalloc(blksz);
1628 if (ext4fs_indir1_block == NULL) {
1629 printf("** DI ext2fs read block (indir 2 1)"
1630 "malloc failed. **\n");
1633 ext4fs_indir1_size = blksz;
1635 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1636 log2_blksz) != ext4fs_indir1_blkno) {
1638 ext4fs_devread((lbaint_t)__le32_to_cpu
1640 double_indir_block) << log2_blksz,
1642 (char *)ext4fs_indir1_block);
1644 printf("** DI ext2fs read block (indir 2 1)"
1648 ext4fs_indir1_blkno =
1649 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1653 if (ext4fs_indir2_block == NULL) {
1654 ext4fs_indir2_block = zalloc(blksz);
1655 if (ext4fs_indir2_block == NULL) {
1656 printf("** DI ext2fs read block (indir 2 2)"
1657 "malloc failed. **\n");
1660 ext4fs_indir2_size = blksz;
1661 ext4fs_indir2_blkno = -1;
1663 if (blksz != ext4fs_indir2_size) {
1664 free(ext4fs_indir2_block);
1665 ext4fs_indir2_block = NULL;
1666 ext4fs_indir2_size = 0;
1667 ext4fs_indir2_blkno = -1;
1668 ext4fs_indir2_block = zalloc(blksz);
1669 if (ext4fs_indir2_block == NULL) {
1670 printf("** DI ext2fs read block (indir 2 2)"
1671 "malloc failed. **\n");
1674 ext4fs_indir2_size = blksz;
1676 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1677 log2_blksz) != ext4fs_indir2_blkno) {
1678 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1679 (ext4fs_indir1_block
1681 perblock]) << log2_blksz, 0,
1683 (char *)ext4fs_indir2_block);
1685 printf("** DI ext2fs read block (indir 2 2)"
1689 ext4fs_indir2_blkno =
1690 __le32_to_cpu(ext4fs_indir1_block[rblock
1695 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1697 /* Tripple indirect. */
1699 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1700 (blksz / 4 * blksz / 4));
1701 perblock_child = blksz / 4;
1702 perblock_parent = ((blksz / 4) * (blksz / 4));
1704 if (ext4fs_indir1_block == NULL) {
1705 ext4fs_indir1_block = zalloc(blksz);
1706 if (ext4fs_indir1_block == NULL) {
1707 printf("** TI ext2fs read block (indir 2 1)"
1708 "malloc failed. **\n");
1711 ext4fs_indir1_size = blksz;
1712 ext4fs_indir1_blkno = -1;
1714 if (blksz != ext4fs_indir1_size) {
1715 free(ext4fs_indir1_block);
1716 ext4fs_indir1_block = NULL;
1717 ext4fs_indir1_size = 0;
1718 ext4fs_indir1_blkno = -1;
1719 ext4fs_indir1_block = zalloc(blksz);
1720 if (ext4fs_indir1_block == NULL) {
1721 printf("** TI ext2fs read block (indir 2 1)"
1722 "malloc failed. **\n");
1725 ext4fs_indir1_size = blksz;
1727 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1728 log2_blksz) != ext4fs_indir1_blkno) {
1729 status = ext4fs_devread
1731 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1732 << log2_blksz, 0, blksz,
1733 (char *)ext4fs_indir1_block);
1735 printf("** TI ext2fs read block (indir 2 1)"
1739 ext4fs_indir1_blkno =
1740 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1744 if (ext4fs_indir2_block == NULL) {
1745 ext4fs_indir2_block = zalloc(blksz);
1746 if (ext4fs_indir2_block == NULL) {
1747 printf("** TI ext2fs read block (indir 2 2)"
1748 "malloc failed. **\n");
1751 ext4fs_indir2_size = blksz;
1752 ext4fs_indir2_blkno = -1;
1754 if (blksz != ext4fs_indir2_size) {
1755 free(ext4fs_indir2_block);
1756 ext4fs_indir2_block = NULL;
1757 ext4fs_indir2_size = 0;
1758 ext4fs_indir2_blkno = -1;
1759 ext4fs_indir2_block = zalloc(blksz);
1760 if (ext4fs_indir2_block == NULL) {
1761 printf("** TI ext2fs read block (indir 2 2)"
1762 "malloc failed. **\n");
1765 ext4fs_indir2_size = blksz;
1767 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1768 perblock_parent]) <<
1770 != ext4fs_indir2_blkno) {
1771 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1772 (ext4fs_indir1_block
1774 perblock_parent]) <<
1775 log2_blksz, 0, blksz,
1776 (char *)ext4fs_indir2_block);
1778 printf("** TI ext2fs read block (indir 2 2)"
1782 ext4fs_indir2_blkno =
1783 __le32_to_cpu(ext4fs_indir1_block[rblock /
1788 if (ext4fs_indir3_block == NULL) {
1789 ext4fs_indir3_block = zalloc(blksz);
1790 if (ext4fs_indir3_block == NULL) {
1791 printf("** TI ext2fs read block (indir 2 2)"
1792 "malloc failed. **\n");
1795 ext4fs_indir3_size = blksz;
1796 ext4fs_indir3_blkno = -1;
1798 if (blksz != ext4fs_indir3_size) {
1799 free(ext4fs_indir3_block);
1800 ext4fs_indir3_block = NULL;
1801 ext4fs_indir3_size = 0;
1802 ext4fs_indir3_blkno = -1;
1803 ext4fs_indir3_block = zalloc(blksz);
1804 if (ext4fs_indir3_block == NULL) {
1805 printf("** TI ext2fs read block (indir 2 2)"
1806 "malloc failed. **\n");
1809 ext4fs_indir3_size = blksz;
1811 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1814 log2_blksz) != ext4fs_indir3_blkno) {
1816 ext4fs_devread((lbaint_t)__le32_to_cpu
1817 (ext4fs_indir2_block
1818 [(rblock / perblock_child)
1819 % (blksz / 4)]) << log2_blksz, 0,
1820 blksz, (char *)ext4fs_indir3_block);
1822 printf("** TI ext2fs read block (indir 2 2)"
1826 ext4fs_indir3_blkno =
1827 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1834 blknr = __le32_to_cpu(ext4fs_indir3_block
1835 [rblock % perblock_child]);
1837 debug("read_allocated_block %ld\n", blknr);
1843 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1846 * This function assures that for a file with the same name but different size
1847 * the sequential store on the ext4 filesystem will be correct.
1849 * In this function the global data, responsible for internal representation
1850 * of the ext4 data are initialized to the reset state. Without this, during
1851 * replacement of the smaller file with the bigger truncation of new file was
1854 void ext4fs_reinit_global(void)
1856 if (ext4fs_indir1_block != NULL) {
1857 free(ext4fs_indir1_block);
1858 ext4fs_indir1_block = NULL;
1859 ext4fs_indir1_size = 0;
1860 ext4fs_indir1_blkno = -1;
1862 if (ext4fs_indir2_block != NULL) {
1863 free(ext4fs_indir2_block);
1864 ext4fs_indir2_block = NULL;
1865 ext4fs_indir2_size = 0;
1866 ext4fs_indir2_blkno = -1;
1868 if (ext4fs_indir3_block != NULL) {
1869 free(ext4fs_indir3_block);
1870 ext4fs_indir3_block = NULL;
1871 ext4fs_indir3_size = 0;
1872 ext4fs_indir3_blkno = -1;
1875 void ext4fs_close(void)
1877 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1878 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1881 if (ext4fs_root != NULL) {
1886 ext4fs_reinit_global();
1889 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1890 struct ext2fs_node **fnode, int *ftype)
1892 unsigned int fpos = 0;
1894 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1898 printf("Iterate dir %s\n", name);
1899 #endif /* of DEBUG */
1900 if (!diro->inode_read) {
1901 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1905 /* Search the file. */
1906 while (fpos < __le32_to_cpu(diro->inode.size)) {
1907 struct ext2_dirent dirent;
1909 status = ext4fs_read_file(diro, fpos,
1910 sizeof(struct ext2_dirent),
1915 if (dirent.namelen != 0) {
1916 char filename[dirent.namelen + 1];
1917 struct ext2fs_node *fdiro;
1918 int type = FILETYPE_UNKNOWN;
1920 status = ext4fs_read_file(diro,
1922 sizeof(struct ext2_dirent),
1923 dirent.namelen, filename);
1927 fdiro = zalloc(sizeof(struct ext2fs_node));
1931 fdiro->data = diro->data;
1932 fdiro->ino = __le32_to_cpu(dirent.inode);
1934 filename[dirent.namelen] = '\0';
1936 if (dirent.filetype != FILETYPE_UNKNOWN) {
1937 fdiro->inode_read = 0;
1939 if (dirent.filetype == FILETYPE_DIRECTORY)
1940 type = FILETYPE_DIRECTORY;
1941 else if (dirent.filetype == FILETYPE_SYMLINK)
1942 type = FILETYPE_SYMLINK;
1943 else if (dirent.filetype == FILETYPE_REG)
1944 type = FILETYPE_REG;
1946 status = ext4fs_read_inode(diro->data,
1954 fdiro->inode_read = 1;
1956 if ((__le16_to_cpu(fdiro->inode.mode) &
1957 FILETYPE_INO_MASK) ==
1958 FILETYPE_INO_DIRECTORY) {
1959 type = FILETYPE_DIRECTORY;
1960 } else if ((__le16_to_cpu(fdiro->inode.mode)
1961 & FILETYPE_INO_MASK) ==
1962 FILETYPE_INO_SYMLINK) {
1963 type = FILETYPE_SYMLINK;
1964 } else if ((__le16_to_cpu(fdiro->inode.mode)
1965 & FILETYPE_INO_MASK) ==
1967 type = FILETYPE_REG;
1971 printf("iterate >%s<\n", filename);
1972 #endif /* of DEBUG */
1973 if ((name != NULL) && (fnode != NULL)
1974 && (ftype != NULL)) {
1975 if (strcmp(filename, name) == 0) {
1981 if (fdiro->inode_read == 0) {
1982 status = ext4fs_read_inode(diro->data,
1990 fdiro->inode_read = 1;
1993 case FILETYPE_DIRECTORY:
1996 case FILETYPE_SYMLINK:
2007 __le32_to_cpu(fdiro->inode.size),
2012 fpos += __le16_to_cpu(dirent.direntlen);
2017 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2020 struct ext2fs_node *diro = node;
2023 if (!diro->inode_read) {
2024 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2028 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2032 if (__le32_to_cpu(diro->inode.size) <= 60) {
2033 strncpy(symlink, diro->inode.b.symlink,
2034 __le32_to_cpu(diro->inode.size));
2036 status = ext4fs_read_file(diro, 0,
2037 __le32_to_cpu(diro->inode.size),
2044 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2048 static int ext4fs_find_file1(const char *currpath,
2049 struct ext2fs_node *currroot,
2050 struct ext2fs_node **currfound, int *foundtype)
2052 char fpath[strlen(currpath) + 1];
2056 int type = FILETYPE_DIRECTORY;
2057 struct ext2fs_node *currnode = currroot;
2058 struct ext2fs_node *oldnode = currroot;
2060 strncpy(fpath, currpath, strlen(currpath) + 1);
2062 /* Remove all leading slashes. */
2063 while (*name == '/')
2067 *currfound = currnode;
2074 /* Extract the actual part from the pathname. */
2075 next = strchr(name, '/');
2077 /* Remove all leading slashes. */
2078 while (*next == '/')
2082 if (type != FILETYPE_DIRECTORY) {
2083 ext4fs_free_node(currnode, currroot);
2089 /* Iterate over the directory. */
2090 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2097 /* Read in the symlink and follow it. */
2098 if (type == FILETYPE_SYMLINK) {
2101 /* Test if the symlink does not loop. */
2102 if (++symlinknest == 8) {
2103 ext4fs_free_node(currnode, currroot);
2104 ext4fs_free_node(oldnode, currroot);
2108 symlink = ext4fs_read_symlink(currnode);
2109 ext4fs_free_node(currnode, currroot);
2112 ext4fs_free_node(oldnode, currroot);
2116 debug("Got symlink >%s<\n", symlink);
2118 if (symlink[0] == '/') {
2119 ext4fs_free_node(oldnode, currroot);
2120 oldnode = &ext4fs_root->diropen;
2123 /* Lookup the node the symlink points to. */
2124 status = ext4fs_find_file1(symlink, oldnode,
2130 ext4fs_free_node(oldnode, currroot);
2135 ext4fs_free_node(oldnode, currroot);
2137 /* Found the node! */
2138 if (!next || *next == '\0') {
2139 *currfound = currnode;
2148 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2149 struct ext2fs_node **foundnode, int expecttype)
2152 int foundtype = FILETYPE_DIRECTORY;
2158 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2162 /* Check if the node that was found was of the expected type. */
2163 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2165 else if ((expecttype == FILETYPE_DIRECTORY)
2166 && (foundtype != expecttype))
2172 int ext4fs_open(const char *filename)
2174 struct ext2fs_node *fdiro = NULL;
2178 if (ext4fs_root == NULL)
2182 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2187 if (!fdiro->inode_read) {
2188 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2193 len = __le32_to_cpu(fdiro->inode.size);
2194 ext4fs_file = fdiro;
2198 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2203 int ext4fs_mount(unsigned part_length)
2205 struct ext2_data *data;
2207 struct ext_filesystem *fs = get_fs();
2208 data = zalloc(SUPERBLOCK_SIZE);
2212 /* Read the superblock. */
2213 status = ext4_read_superblock((char *)&data->sblock);
2218 /* Make sure this is an ext2 filesystem. */
2219 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2222 if (__le32_to_cpu(data->sblock.revision_level == 0))
2225 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2227 debug("EXT2 rev %d, inode_size %d\n",
2228 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2230 data->diropen.data = data;
2231 data->diropen.ino = 2;
2232 data->diropen.inode_read = 1;
2233 data->inode = &data->diropen.inode;
2235 status = ext4fs_read_inode(data, 2, data->inode);
2243 printf("Failed to mount ext2 filesystem...\n");