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 if (fs->blksz != 1024) {
908 bg_idx = fs->curr_blkno / blk_per_grp;
910 bg_idx = fs->curr_blkno / blk_per_grp;
911 remainder = fs->curr_blkno % blk_per_grp;
917 * To skip completely filled block group bitmaps
918 * Optimize the block allocation
920 if (bg_idx >= fs->no_blkgrp)
923 if (bgd[bg_idx].free_blocks == 0) {
924 debug("block group %u is full. Skipping\n", bg_idx);
925 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
930 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
931 memset(zero_buffer, '\0', fs->blksz);
932 put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
933 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
934 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
935 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
936 ~EXT4_BG_BLOCK_UNINIT;
939 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
941 debug("going for restart for the block no %ld %u\n",
942 fs->curr_blkno, bg_idx);
947 if (prev_bg_bitmap_index != bg_idx) {
948 memset(journal_buffer, '\0', fs->blksz);
949 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
951 0, fs->blksz, journal_buffer);
954 if (ext4fs_log_journal(journal_buffer,
955 bgd[bg_idx].block_id))
958 prev_bg_bitmap_index = bg_idx;
960 bgd[bg_idx].free_blocks--;
961 fs->sb->free_blocks--;
965 free(journal_buffer);
968 return fs->curr_blkno;
970 free(journal_buffer);
976 int ext4fs_get_new_inode_no(void)
980 unsigned int ibmap_idx;
981 static int prev_inode_bitmap_index = -1;
982 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
983 struct ext_filesystem *fs = get_fs();
984 char *journal_buffer = zalloc(fs->blksz);
985 char *zero_buffer = zalloc(fs->blksz);
986 if (!journal_buffer || !zero_buffer)
988 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
990 if (fs->first_pass_ibmap == 0) {
991 for (i = 0; i < fs->no_blkgrp; i++) {
992 if (bgd[i].free_inodes) {
993 if (bgd[i].bg_itable_unused !=
995 bgd[i].bg_itable_unused =
997 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
999 ((uint64_t)bgd[i].inode_id *
1000 (uint64_t)fs->blksz)),
1001 zero_buffer, fs->blksz);
1002 bgd[i].bg_flags = bgd[i].bg_flags &
1003 ~EXT4_BG_INODE_UNINIT;
1004 memcpy(fs->inode_bmaps[i],
1005 zero_buffer, fs->blksz);
1008 _get_new_inode_no(fs->inode_bmaps[i]);
1009 if (fs->curr_inode_no == -1)
1010 /* if block bitmap is completely fill */
1012 fs->curr_inode_no = fs->curr_inode_no +
1013 (i * inodes_per_grp);
1014 fs->first_pass_ibmap++;
1015 bgd[i].free_inodes--;
1016 bgd[i].bg_itable_unused--;
1017 fs->sb->free_inodes--;
1018 status = ext4fs_devread((lbaint_t)
1025 if (ext4fs_log_journal(journal_buffer,
1030 debug("no inode left on block group %d\n", i);
1035 fs->curr_inode_no++;
1036 /* get the blockbitmap index respective to blockno */
1037 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1038 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1039 memset(zero_buffer, '\0', fs->blksz);
1040 put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
1041 (uint64_t)fs->blksz)), zero_buffer,
1043 bgd[ibmap_idx].bg_flags =
1044 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1045 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1049 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1050 fs->inode_bmaps[ibmap_idx],
1052 debug("going for restart for the block no %d %u\n",
1053 fs->curr_inode_no, ibmap_idx);
1057 /* journal backup */
1058 if (prev_inode_bitmap_index != ibmap_idx) {
1059 memset(journal_buffer, '\0', fs->blksz);
1060 status = ext4fs_devread((lbaint_t)
1061 bgd[ibmap_idx].inode_id
1063 0, fs->blksz, journal_buffer);
1066 if (ext4fs_log_journal(journal_buffer,
1067 bgd[ibmap_idx].inode_id))
1069 prev_inode_bitmap_index = ibmap_idx;
1071 if (bgd[ibmap_idx].bg_itable_unused !=
1072 bgd[ibmap_idx].free_inodes)
1073 bgd[ibmap_idx].bg_itable_unused =
1074 bgd[ibmap_idx].free_inodes;
1075 bgd[ibmap_idx].free_inodes--;
1076 bgd[ibmap_idx].bg_itable_unused--;
1077 fs->sb->free_inodes--;
1082 free(journal_buffer);
1085 return fs->curr_inode_no;
1087 free(journal_buffer);
1095 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1096 unsigned int *total_remaining_blocks,
1097 unsigned int *no_blks_reqd)
1101 long int actual_block_no;
1102 long int si_blockno;
1103 /* si :single indirect */
1104 unsigned int *si_buffer = NULL;
1105 unsigned int *si_start_addr = NULL;
1106 struct ext_filesystem *fs = get_fs();
1108 if (*total_remaining_blocks != 0) {
1109 si_buffer = zalloc(fs->blksz);
1111 printf("No Memory\n");
1114 si_start_addr = si_buffer;
1115 si_blockno = ext4fs_get_new_blk_no();
1116 if (si_blockno == -1) {
1117 printf("no block left to assign\n");
1121 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1123 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1124 0, fs->blksz, (char *)si_buffer);
1125 memset(si_buffer, '\0', fs->blksz);
1129 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1130 actual_block_no = ext4fs_get_new_blk_no();
1131 if (actual_block_no == -1) {
1132 printf("no block left to assign\n");
1135 *si_buffer = actual_block_no;
1136 debug("SIAB %u: %u\n", *si_buffer,
1137 *total_remaining_blocks);
1140 (*total_remaining_blocks)--;
1141 if (*total_remaining_blocks == 0)
1145 /* write the block to disk */
1146 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1147 si_start_addr, fs->blksz);
1148 file_inode->b.blocks.indir_block = si_blockno;
1151 free(si_start_addr);
1154 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1155 unsigned int *total_remaining_blocks,
1156 unsigned int *no_blks_reqd)
1161 long int actual_block_no;
1162 /* di:double indirect */
1163 long int di_blockno_parent;
1164 long int di_blockno_child;
1165 unsigned int *di_parent_buffer = NULL;
1166 unsigned int *di_child_buff = NULL;
1167 unsigned int *di_block_start_addr = NULL;
1168 unsigned int *di_child_buff_start = NULL;
1169 struct ext_filesystem *fs = get_fs();
1171 if (*total_remaining_blocks != 0) {
1172 /* double indirect parent block connecting to inode */
1173 di_blockno_parent = ext4fs_get_new_blk_no();
1174 if (di_blockno_parent == -1) {
1175 printf("no block left to assign\n");
1178 di_parent_buffer = zalloc(fs->blksz);
1179 if (!di_parent_buffer)
1182 di_block_start_addr = di_parent_buffer;
1184 debug("DIPB %ld: %u\n", di_blockno_parent,
1185 *total_remaining_blocks);
1187 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1189 fs->blksz, (char *)di_parent_buffer);
1192 printf("%s: Device read error!\n", __func__);
1195 memset(di_parent_buffer, '\0', fs->blksz);
1198 * start:for each double indirect parent
1199 * block create one more block
1201 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1202 di_blockno_child = ext4fs_get_new_blk_no();
1203 if (di_blockno_child == -1) {
1204 printf("no block left to assign\n");
1207 di_child_buff = zalloc(fs->blksz);
1211 di_child_buff_start = di_child_buff;
1212 *di_parent_buffer = di_blockno_child;
1215 debug("DICB %ld: %u\n", di_blockno_child,
1216 *total_remaining_blocks);
1218 status = ext4fs_devread((lbaint_t)di_blockno_child *
1221 (char *)di_child_buff);
1224 printf("%s: Device read error!\n", __func__);
1227 memset(di_child_buff, '\0', fs->blksz);
1228 /* filling of actual datablocks for each child */
1229 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1230 actual_block_no = ext4fs_get_new_blk_no();
1231 if (actual_block_no == -1) {
1232 printf("no block left to assign\n");
1235 *di_child_buff = actual_block_no;
1236 debug("DIAB %ld: %u\n", actual_block_no,
1237 *total_remaining_blocks);
1240 (*total_remaining_blocks)--;
1241 if (*total_remaining_blocks == 0)
1244 /* write the block table */
1245 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1246 di_child_buff_start, fs->blksz);
1247 free(di_child_buff_start);
1248 di_child_buff_start = NULL;
1250 if (*total_remaining_blocks == 0)
1253 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1254 di_block_start_addr, fs->blksz);
1255 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1258 free(di_block_start_addr);
1261 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1262 unsigned int *total_remaining_blocks,
1263 unsigned int *no_blks_reqd)
1268 long int actual_block_no;
1269 /* ti: Triple Indirect */
1270 long int ti_gp_blockno;
1271 long int ti_parent_blockno;
1272 long int ti_child_blockno;
1273 unsigned int *ti_gp_buff = NULL;
1274 unsigned int *ti_parent_buff = NULL;
1275 unsigned int *ti_child_buff = NULL;
1276 unsigned int *ti_gp_buff_start_addr = NULL;
1277 unsigned int *ti_pbuff_start_addr = NULL;
1278 unsigned int *ti_cbuff_start_addr = NULL;
1279 struct ext_filesystem *fs = get_fs();
1280 if (*total_remaining_blocks != 0) {
1281 /* triple indirect grand parent block connecting to inode */
1282 ti_gp_blockno = ext4fs_get_new_blk_no();
1283 if (ti_gp_blockno == -1) {
1284 printf("no block left to assign\n");
1287 ti_gp_buff = zalloc(fs->blksz);
1291 ti_gp_buff_start_addr = ti_gp_buff;
1293 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1294 *total_remaining_blocks);
1296 /* for each 4 byte grand parent entry create one more block */
1297 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1298 ti_parent_blockno = ext4fs_get_new_blk_no();
1299 if (ti_parent_blockno == -1) {
1300 printf("no block left to assign\n");
1303 ti_parent_buff = zalloc(fs->blksz);
1304 if (!ti_parent_buff)
1307 ti_pbuff_start_addr = ti_parent_buff;
1308 *ti_gp_buff = ti_parent_blockno;
1311 debug("TIPB %ld: %u\n", ti_parent_blockno,
1312 *total_remaining_blocks);
1314 /* for each 4 byte entry parent create one more block */
1315 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1316 ti_child_blockno = ext4fs_get_new_blk_no();
1317 if (ti_child_blockno == -1) {
1318 printf("no block left assign\n");
1321 ti_child_buff = zalloc(fs->blksz);
1325 ti_cbuff_start_addr = ti_child_buff;
1326 *ti_parent_buff = ti_child_blockno;
1329 debug("TICB %ld: %u\n", ti_parent_blockno,
1330 *total_remaining_blocks);
1332 /* fill actual datablocks for each child */
1333 for (k = 0; k < (fs->blksz / sizeof(int));
1336 ext4fs_get_new_blk_no();
1337 if (actual_block_no == -1) {
1338 printf("no block left\n");
1341 *ti_child_buff = actual_block_no;
1342 debug("TIAB %ld: %u\n", actual_block_no,
1343 *total_remaining_blocks);
1346 (*total_remaining_blocks)--;
1347 if (*total_remaining_blocks == 0)
1350 /* write the child block */
1351 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1352 (uint64_t)fs->blksz)),
1353 ti_cbuff_start_addr, fs->blksz);
1354 free(ti_cbuff_start_addr);
1356 if (*total_remaining_blocks == 0)
1359 /* write the parent block */
1360 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1361 ti_pbuff_start_addr, fs->blksz);
1362 free(ti_pbuff_start_addr);
1364 if (*total_remaining_blocks == 0)
1367 /* write the grand parent block */
1368 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1369 ti_gp_buff_start_addr, fs->blksz);
1370 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1373 free(ti_gp_buff_start_addr);
1376 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1377 unsigned int total_remaining_blocks,
1378 unsigned int *total_no_of_block)
1381 long int direct_blockno;
1382 unsigned int no_blks_reqd = 0;
1384 /* allocation of direct blocks */
1385 for (i = 0; i < INDIRECT_BLOCKS; i++) {
1386 direct_blockno = ext4fs_get_new_blk_no();
1387 if (direct_blockno == -1) {
1388 printf("no block left to assign\n");
1391 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1392 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1394 total_remaining_blocks--;
1395 if (total_remaining_blocks == 0)
1399 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1401 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1403 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1405 *total_no_of_block += no_blks_reqd;
1410 static struct ext4_extent_header *ext4fs_get_extent_block
1411 (struct ext2_data *data, char *buf,
1412 struct ext4_extent_header *ext_block,
1413 uint32_t fileblock, int log2_blksz)
1415 struct ext4_extent_idx *index;
1416 unsigned long long block;
1417 int blksz = EXT2_BLOCK_SIZE(data);
1421 index = (struct ext4_extent_idx *)(ext_block + 1);
1423 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1426 if (ext_block->eh_depth == 0)
1431 if (i >= le16_to_cpu(ext_block->eh_entries))
1433 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1438 block = le16_to_cpu(index[i].ei_leaf_hi);
1439 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1441 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1443 ext_block = (struct ext4_extent_header *)buf;
1449 static int ext4fs_blockgroup
1450 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1453 unsigned int blkoff, desc_per_blk;
1454 int log2blksz = get_fs()->dev_desc->log2blksz;
1456 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1458 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1459 group / desc_per_blk;
1460 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1462 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1463 group, blkno, blkoff);
1465 return ext4fs_devread((lbaint_t)blkno <<
1466 (LOG2_BLOCK_SIZE(data) - log2blksz),
1467 blkoff, sizeof(struct ext2_block_group),
1471 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1473 struct ext2_block_group blkgrp;
1474 struct ext2_sblock *sblock = &data->sblock;
1475 struct ext_filesystem *fs = get_fs();
1476 int log2blksz = get_fs()->dev_desc->log2blksz;
1477 int inodes_per_block, status;
1479 unsigned int blkoff;
1481 /* It is easier to calculate if the first inode is 0. */
1483 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1484 (sblock->inodes_per_group), &blkgrp);
1488 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1489 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1490 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1491 blkoff = (ino % inodes_per_block) * fs->inodesz;
1492 /* Read the inode. */
1493 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1495 sizeof(struct ext2_inode), (char *)inode);
1502 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1509 long int perblock_parent;
1510 long int perblock_child;
1511 unsigned long long start;
1512 /* get the blocksize of the filesystem */
1513 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1514 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1515 - get_fs()->dev_desc->log2blksz;
1517 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1518 char *buf = zalloc(blksz);
1521 struct ext4_extent_header *ext_block;
1522 struct ext4_extent *extent;
1525 ext4fs_get_extent_block(ext4fs_root, buf,
1526 (struct ext4_extent_header *)
1527 inode->b.blocks.dir_blocks,
1528 fileblock, log2_blksz);
1530 printf("invalid extent block\n");
1535 extent = (struct ext4_extent *)(ext_block + 1);
1539 if (i >= le16_to_cpu(ext_block->eh_entries))
1541 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1543 fileblock -= le32_to_cpu(extent[i].ee_block);
1544 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1549 start = le16_to_cpu(extent[i].ee_start_hi);
1550 start = (start << 32) +
1551 le32_to_cpu(extent[i].ee_start_lo);
1553 return fileblock + start;
1556 printf("Extent Error\n");
1561 /* Direct blocks. */
1562 if (fileblock < INDIRECT_BLOCKS)
1563 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1566 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1567 if (ext4fs_indir1_block == NULL) {
1568 ext4fs_indir1_block = zalloc(blksz);
1569 if (ext4fs_indir1_block == NULL) {
1570 printf("** SI ext2fs read block (indir 1)"
1571 "malloc failed. **\n");
1574 ext4fs_indir1_size = blksz;
1575 ext4fs_indir1_blkno = -1;
1577 if (blksz != ext4fs_indir1_size) {
1578 free(ext4fs_indir1_block);
1579 ext4fs_indir1_block = NULL;
1580 ext4fs_indir1_size = 0;
1581 ext4fs_indir1_blkno = -1;
1582 ext4fs_indir1_block = zalloc(blksz);
1583 if (ext4fs_indir1_block == NULL) {
1584 printf("** SI ext2fs read block (indir 1):"
1585 "malloc failed. **\n");
1588 ext4fs_indir1_size = blksz;
1590 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1591 log2_blksz) != ext4fs_indir1_blkno) {
1593 ext4fs_devread((lbaint_t)__le32_to_cpu
1595 indir_block) << log2_blksz, 0,
1596 blksz, (char *)ext4fs_indir1_block);
1598 printf("** SI ext2fs read block (indir 1)"
1602 ext4fs_indir1_blkno =
1603 __le32_to_cpu(inode->b.blocks.
1604 indir_block) << log2_blksz;
1606 blknr = __le32_to_cpu(ext4fs_indir1_block
1607 [fileblock - INDIRECT_BLOCKS]);
1609 /* Double indirect. */
1610 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1611 (blksz / 4 + 1)))) {
1613 long int perblock = blksz / 4;
1614 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1616 if (ext4fs_indir1_block == NULL) {
1617 ext4fs_indir1_block = zalloc(blksz);
1618 if (ext4fs_indir1_block == NULL) {
1619 printf("** DI ext2fs read block (indir 2 1)"
1620 "malloc failed. **\n");
1623 ext4fs_indir1_size = blksz;
1624 ext4fs_indir1_blkno = -1;
1626 if (blksz != ext4fs_indir1_size) {
1627 free(ext4fs_indir1_block);
1628 ext4fs_indir1_block = NULL;
1629 ext4fs_indir1_size = 0;
1630 ext4fs_indir1_blkno = -1;
1631 ext4fs_indir1_block = zalloc(blksz);
1632 if (ext4fs_indir1_block == NULL) {
1633 printf("** DI ext2fs read block (indir 2 1)"
1634 "malloc failed. **\n");
1637 ext4fs_indir1_size = blksz;
1639 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1640 log2_blksz) != ext4fs_indir1_blkno) {
1642 ext4fs_devread((lbaint_t)__le32_to_cpu
1644 double_indir_block) << log2_blksz,
1646 (char *)ext4fs_indir1_block);
1648 printf("** DI ext2fs read block (indir 2 1)"
1652 ext4fs_indir1_blkno =
1653 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1657 if (ext4fs_indir2_block == NULL) {
1658 ext4fs_indir2_block = zalloc(blksz);
1659 if (ext4fs_indir2_block == NULL) {
1660 printf("** DI ext2fs read block (indir 2 2)"
1661 "malloc failed. **\n");
1664 ext4fs_indir2_size = blksz;
1665 ext4fs_indir2_blkno = -1;
1667 if (blksz != ext4fs_indir2_size) {
1668 free(ext4fs_indir2_block);
1669 ext4fs_indir2_block = NULL;
1670 ext4fs_indir2_size = 0;
1671 ext4fs_indir2_blkno = -1;
1672 ext4fs_indir2_block = zalloc(blksz);
1673 if (ext4fs_indir2_block == NULL) {
1674 printf("** DI ext2fs read block (indir 2 2)"
1675 "malloc failed. **\n");
1678 ext4fs_indir2_size = blksz;
1680 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1681 log2_blksz) != ext4fs_indir2_blkno) {
1682 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1683 (ext4fs_indir1_block
1685 perblock]) << log2_blksz, 0,
1687 (char *)ext4fs_indir2_block);
1689 printf("** DI ext2fs read block (indir 2 2)"
1693 ext4fs_indir2_blkno =
1694 __le32_to_cpu(ext4fs_indir1_block[rblock
1699 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1701 /* Tripple indirect. */
1703 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1704 (blksz / 4 * blksz / 4));
1705 perblock_child = blksz / 4;
1706 perblock_parent = ((blksz / 4) * (blksz / 4));
1708 if (ext4fs_indir1_block == NULL) {
1709 ext4fs_indir1_block = zalloc(blksz);
1710 if (ext4fs_indir1_block == NULL) {
1711 printf("** TI ext2fs read block (indir 2 1)"
1712 "malloc failed. **\n");
1715 ext4fs_indir1_size = blksz;
1716 ext4fs_indir1_blkno = -1;
1718 if (blksz != ext4fs_indir1_size) {
1719 free(ext4fs_indir1_block);
1720 ext4fs_indir1_block = NULL;
1721 ext4fs_indir1_size = 0;
1722 ext4fs_indir1_blkno = -1;
1723 ext4fs_indir1_block = zalloc(blksz);
1724 if (ext4fs_indir1_block == NULL) {
1725 printf("** TI ext2fs read block (indir 2 1)"
1726 "malloc failed. **\n");
1729 ext4fs_indir1_size = blksz;
1731 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1732 log2_blksz) != ext4fs_indir1_blkno) {
1733 status = ext4fs_devread
1735 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1736 << log2_blksz, 0, blksz,
1737 (char *)ext4fs_indir1_block);
1739 printf("** TI ext2fs read block (indir 2 1)"
1743 ext4fs_indir1_blkno =
1744 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1748 if (ext4fs_indir2_block == NULL) {
1749 ext4fs_indir2_block = zalloc(blksz);
1750 if (ext4fs_indir2_block == NULL) {
1751 printf("** TI ext2fs read block (indir 2 2)"
1752 "malloc failed. **\n");
1755 ext4fs_indir2_size = blksz;
1756 ext4fs_indir2_blkno = -1;
1758 if (blksz != ext4fs_indir2_size) {
1759 free(ext4fs_indir2_block);
1760 ext4fs_indir2_block = NULL;
1761 ext4fs_indir2_size = 0;
1762 ext4fs_indir2_blkno = -1;
1763 ext4fs_indir2_block = zalloc(blksz);
1764 if (ext4fs_indir2_block == NULL) {
1765 printf("** TI ext2fs read block (indir 2 2)"
1766 "malloc failed. **\n");
1769 ext4fs_indir2_size = blksz;
1771 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1772 perblock_parent]) <<
1774 != ext4fs_indir2_blkno) {
1775 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1776 (ext4fs_indir1_block
1778 perblock_parent]) <<
1779 log2_blksz, 0, blksz,
1780 (char *)ext4fs_indir2_block);
1782 printf("** TI ext2fs read block (indir 2 2)"
1786 ext4fs_indir2_blkno =
1787 __le32_to_cpu(ext4fs_indir1_block[rblock /
1792 if (ext4fs_indir3_block == NULL) {
1793 ext4fs_indir3_block = zalloc(blksz);
1794 if (ext4fs_indir3_block == NULL) {
1795 printf("** TI ext2fs read block (indir 2 2)"
1796 "malloc failed. **\n");
1799 ext4fs_indir3_size = blksz;
1800 ext4fs_indir3_blkno = -1;
1802 if (blksz != ext4fs_indir3_size) {
1803 free(ext4fs_indir3_block);
1804 ext4fs_indir3_block = NULL;
1805 ext4fs_indir3_size = 0;
1806 ext4fs_indir3_blkno = -1;
1807 ext4fs_indir3_block = zalloc(blksz);
1808 if (ext4fs_indir3_block == NULL) {
1809 printf("** TI ext2fs read block (indir 2 2)"
1810 "malloc failed. **\n");
1813 ext4fs_indir3_size = blksz;
1815 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1818 log2_blksz) != ext4fs_indir3_blkno) {
1820 ext4fs_devread((lbaint_t)__le32_to_cpu
1821 (ext4fs_indir2_block
1822 [(rblock / perblock_child)
1823 % (blksz / 4)]) << log2_blksz, 0,
1824 blksz, (char *)ext4fs_indir3_block);
1826 printf("** TI ext2fs read block (indir 2 2)"
1830 ext4fs_indir3_blkno =
1831 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1838 blknr = __le32_to_cpu(ext4fs_indir3_block
1839 [rblock % perblock_child]);
1841 debug("read_allocated_block %ld\n", blknr);
1846 void ext4fs_close(void)
1848 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1849 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1852 if (ext4fs_root != NULL) {
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;
1876 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1877 struct ext2fs_node **fnode, int *ftype)
1879 unsigned int fpos = 0;
1881 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1885 printf("Iterate dir %s\n", name);
1886 #endif /* of DEBUG */
1887 if (!diro->inode_read) {
1888 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1892 /* Search the file. */
1893 while (fpos < __le32_to_cpu(diro->inode.size)) {
1894 struct ext2_dirent dirent;
1896 status = ext4fs_read_file(diro, fpos,
1897 sizeof(struct ext2_dirent),
1902 if (dirent.namelen != 0) {
1903 char filename[dirent.namelen + 1];
1904 struct ext2fs_node *fdiro;
1905 int type = FILETYPE_UNKNOWN;
1907 status = ext4fs_read_file(diro,
1909 sizeof(struct ext2_dirent),
1910 dirent.namelen, filename);
1914 fdiro = zalloc(sizeof(struct ext2fs_node));
1918 fdiro->data = diro->data;
1919 fdiro->ino = __le32_to_cpu(dirent.inode);
1921 filename[dirent.namelen] = '\0';
1923 if (dirent.filetype != FILETYPE_UNKNOWN) {
1924 fdiro->inode_read = 0;
1926 if (dirent.filetype == FILETYPE_DIRECTORY)
1927 type = FILETYPE_DIRECTORY;
1928 else if (dirent.filetype == FILETYPE_SYMLINK)
1929 type = FILETYPE_SYMLINK;
1930 else if (dirent.filetype == FILETYPE_REG)
1931 type = FILETYPE_REG;
1933 status = ext4fs_read_inode(diro->data,
1941 fdiro->inode_read = 1;
1943 if ((__le16_to_cpu(fdiro->inode.mode) &
1944 FILETYPE_INO_MASK) ==
1945 FILETYPE_INO_DIRECTORY) {
1946 type = FILETYPE_DIRECTORY;
1947 } else if ((__le16_to_cpu(fdiro->inode.mode)
1948 & FILETYPE_INO_MASK) ==
1949 FILETYPE_INO_SYMLINK) {
1950 type = FILETYPE_SYMLINK;
1951 } else if ((__le16_to_cpu(fdiro->inode.mode)
1952 & FILETYPE_INO_MASK) ==
1954 type = FILETYPE_REG;
1958 printf("iterate >%s<\n", filename);
1959 #endif /* of DEBUG */
1960 if ((name != NULL) && (fnode != NULL)
1961 && (ftype != NULL)) {
1962 if (strcmp(filename, name) == 0) {
1968 if (fdiro->inode_read == 0) {
1969 status = ext4fs_read_inode(diro->data,
1977 fdiro->inode_read = 1;
1980 case FILETYPE_DIRECTORY:
1983 case FILETYPE_SYMLINK:
1994 __le32_to_cpu(fdiro->inode.size),
1999 fpos += __le16_to_cpu(dirent.direntlen);
2004 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2007 struct ext2fs_node *diro = node;
2010 if (!diro->inode_read) {
2011 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2015 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2019 if (__le32_to_cpu(diro->inode.size) <= 60) {
2020 strncpy(symlink, diro->inode.b.symlink,
2021 __le32_to_cpu(diro->inode.size));
2023 status = ext4fs_read_file(diro, 0,
2024 __le32_to_cpu(diro->inode.size),
2031 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2035 static int ext4fs_find_file1(const char *currpath,
2036 struct ext2fs_node *currroot,
2037 struct ext2fs_node **currfound, int *foundtype)
2039 char fpath[strlen(currpath) + 1];
2043 int type = FILETYPE_DIRECTORY;
2044 struct ext2fs_node *currnode = currroot;
2045 struct ext2fs_node *oldnode = currroot;
2047 strncpy(fpath, currpath, strlen(currpath) + 1);
2049 /* Remove all leading slashes. */
2050 while (*name == '/')
2054 *currfound = currnode;
2061 /* Extract the actual part from the pathname. */
2062 next = strchr(name, '/');
2064 /* Remove all leading slashes. */
2065 while (*next == '/')
2069 if (type != FILETYPE_DIRECTORY) {
2070 ext4fs_free_node(currnode, currroot);
2076 /* Iterate over the directory. */
2077 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2084 /* Read in the symlink and follow it. */
2085 if (type == FILETYPE_SYMLINK) {
2088 /* Test if the symlink does not loop. */
2089 if (++symlinknest == 8) {
2090 ext4fs_free_node(currnode, currroot);
2091 ext4fs_free_node(oldnode, currroot);
2095 symlink = ext4fs_read_symlink(currnode);
2096 ext4fs_free_node(currnode, currroot);
2099 ext4fs_free_node(oldnode, currroot);
2103 debug("Got symlink >%s<\n", symlink);
2105 if (symlink[0] == '/') {
2106 ext4fs_free_node(oldnode, currroot);
2107 oldnode = &ext4fs_root->diropen;
2110 /* Lookup the node the symlink points to. */
2111 status = ext4fs_find_file1(symlink, oldnode,
2117 ext4fs_free_node(oldnode, currroot);
2122 ext4fs_free_node(oldnode, currroot);
2124 /* Found the node! */
2125 if (!next || *next == '\0') {
2126 *currfound = currnode;
2135 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2136 struct ext2fs_node **foundnode, int expecttype)
2139 int foundtype = FILETYPE_DIRECTORY;
2145 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2149 /* Check if the node that was found was of the expected type. */
2150 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2152 else if ((expecttype == FILETYPE_DIRECTORY)
2153 && (foundtype != expecttype))
2159 int ext4fs_open(const char *filename)
2161 struct ext2fs_node *fdiro = NULL;
2165 if (ext4fs_root == NULL)
2169 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2174 if (!fdiro->inode_read) {
2175 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2180 len = __le32_to_cpu(fdiro->inode.size);
2181 ext4fs_file = fdiro;
2185 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2190 int ext4fs_mount(unsigned part_length)
2192 struct ext2_data *data;
2194 struct ext_filesystem *fs = get_fs();
2195 data = zalloc(SUPERBLOCK_SIZE);
2199 /* Read the superblock. */
2200 status = ext4_read_superblock((char *)&data->sblock);
2205 /* Make sure this is an ext2 filesystem. */
2206 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2209 if (__le32_to_cpu(data->sblock.revision_level == 0))
2212 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2214 debug("EXT2 rev %d, inode_size %d\n",
2215 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2217 data->diropen.data = data;
2218 data->diropen.ino = 2;
2219 data->diropen.inode_read = 1;
2220 data->inode = &data->diropen.inode;
2222 status = ext4fs_read_inode(data, 2, data->inode);
2230 printf("Failed to mount ext2 filesystem...\n");