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>
29 #include <linux/stat.h>
30 #include <linux/time.h>
31 #include <asm/byteorder.h>
32 #include "ext4_common.h"
34 struct ext2_data *ext4fs_root;
35 struct ext2fs_node *ext4fs_file;
36 uint32_t *ext4fs_indir1_block;
37 int ext4fs_indir1_size;
38 int ext4fs_indir1_blkno = -1;
39 uint32_t *ext4fs_indir2_block;
40 int ext4fs_indir2_size;
41 int ext4fs_indir2_blkno = -1;
43 uint32_t *ext4fs_indir3_block;
44 int ext4fs_indir3_size;
45 int ext4fs_indir3_blkno = -1;
46 struct ext2_inode *g_parent_inode;
47 static int symlinknest;
49 #if defined(CONFIG_EXT4_WRITE)
50 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
52 uint32_t res = size / n;
59 void put_ext4(uint64_t off, void *buf, uint32_t size)
63 unsigned char *temp_ptr = NULL;
64 struct ext_filesystem *fs = get_fs();
65 int log2blksz = fs->dev_desc->log2blksz;
66 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
68 startblock = off >> log2blksz;
69 startblock += part_offset;
70 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
72 if (fs->dev_desc == NULL)
75 if ((startblock + (size >> log2blksz)) >
76 (part_offset + fs->total_sect)) {
77 printf("part_offset is " LBAFU "\n", part_offset);
78 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
79 printf("error: overflow occurs\n");
84 if (fs->dev_desc->block_read) {
85 fs->dev_desc->block_read(fs->dev_desc->dev,
86 startblock, 1, sec_buf);
88 memcpy((temp_ptr + remainder),
89 (unsigned char *)buf, size);
90 fs->dev_desc->block_write(fs->dev_desc->dev,
91 startblock, 1, sec_buf);
94 if (size >> log2blksz != 0) {
95 fs->dev_desc->block_write(fs->dev_desc->dev,
98 (unsigned long *)buf);
100 fs->dev_desc->block_read(fs->dev_desc->dev,
101 startblock, 1, sec_buf);
103 memcpy(temp_ptr, buf, size);
104 fs->dev_desc->block_write(fs->dev_desc->dev,
106 (unsigned long *)sec_buf);
111 static int _get_new_inode_no(unsigned char *buffer)
113 struct ext_filesystem *fs = get_fs();
119 /* get the blocksize of the filesystem */
120 unsigned char *ptr = buffer;
121 while (*ptr == 255) {
124 if (count > ext4fs_root->sblock.inodes_per_group)
128 for (j = 0; j < fs->blksz; j++) {
133 status = input & operand;
148 static int _get_new_blk_no(unsigned char *buffer)
154 unsigned char *ptr = buffer;
155 struct ext_filesystem *fs = get_fs();
157 if (fs->blksz != 1024)
162 while (*ptr == 255) {
165 if (count == (fs->blksz * 8))
169 for (j = 0; j < fs->blksz; j++) {
174 status = input & operand;
189 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
191 int i, remainder, status;
192 unsigned char *ptr = buffer;
193 unsigned char operand;
195 remainder = blockno % 8;
196 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
198 i = i - (index * blocksize);
199 if (blocksize != 1024) {
201 operand = 1 << remainder;
202 status = *ptr & operand;
206 *ptr = *ptr | operand;
209 if (remainder == 0) {
214 operand = (1 << (remainder - 1));
216 status = *ptr & operand;
220 *ptr = *ptr | operand;
225 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
227 int i, remainder, status;
228 unsigned char *ptr = buffer;
229 unsigned char operand;
231 remainder = blockno % 8;
232 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
234 i = i - (index * blocksize);
235 if (blocksize != 1024) {
237 operand = (1 << remainder);
238 status = *ptr & operand;
240 *ptr = *ptr & ~(operand);
242 if (remainder == 0) {
247 operand = (1 << (remainder - 1));
249 status = *ptr & operand;
251 *ptr = *ptr & ~(operand);
255 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
257 int i, remainder, status;
258 unsigned char *ptr = buffer;
259 unsigned char operand;
261 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
263 remainder = inode_no % 8;
264 if (remainder == 0) {
269 operand = (1 << (remainder - 1));
271 status = *ptr & operand;
275 *ptr = *ptr | operand;
280 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
282 int i, remainder, status;
283 unsigned char *ptr = buffer;
284 unsigned char operand;
286 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
288 remainder = inode_no % 8;
289 if (remainder == 0) {
294 operand = (1 << (remainder - 1));
296 status = *ptr & operand;
298 *ptr = *ptr & ~(operand);
301 int ext4fs_checksum_update(unsigned int i)
303 struct ext2_block_group *desc;
304 struct ext_filesystem *fs = get_fs();
307 desc = (struct ext2_block_group *)&fs->bgd[i];
308 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
309 int offset = offsetof(struct ext2_block_group, bg_checksum);
311 crc = ext2fs_crc16(~0, fs->sb->unique_id,
312 sizeof(fs->sb->unique_id));
313 crc = ext2fs_crc16(crc, &i, sizeof(i));
314 crc = ext2fs_crc16(crc, desc, offset);
315 offset += sizeof(desc->bg_checksum); /* skip checksum */
316 assert(offset == sizeof(*desc));
322 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
325 int sizeof_void_space;
326 int new_entry_byte_reqd;
327 short padding_factor = 0;
329 if (dir->namelen % 4 != 0)
330 padding_factor = 4 - (dir->namelen % 4);
332 dentry_length = sizeof(struct ext2_dirent) +
333 dir->namelen + padding_factor;
334 sizeof_void_space = dir->direntlen - dentry_length;
335 if (sizeof_void_space == 0)
339 if (strlen(filename) % 4 != 0)
340 padding_factor = 4 - (strlen(filename) % 4);
342 new_entry_byte_reqd = strlen(filename) +
343 sizeof(struct ext2_dirent) + padding_factor;
344 if (sizeof_void_space >= new_entry_byte_reqd) {
345 dir->direntlen = dentry_length;
346 return sizeof_void_space;
352 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
354 unsigned int *zero_buffer = NULL;
355 char *root_first_block_buffer = NULL;
358 long int first_block_no_of_root = 0;
359 long int previous_blknr = -1;
361 short int padding_factor = 0;
362 unsigned int new_entry_byte_reqd;
363 unsigned int last_entry_dirlen;
364 int sizeof_void_space = 0;
368 struct ext_filesystem *fs = get_fs();
369 /* directory entry */
370 struct ext2_dirent *dir;
371 char *temp_dir = NULL;
373 zero_buffer = zalloc(fs->blksz);
375 printf("No Memory\n");
378 root_first_block_buffer = zalloc(fs->blksz);
379 if (!root_first_block_buffer) {
381 printf("No Memory\n");
386 /* read the block no allocated to a file */
387 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
389 root_blknr = read_allocated_block(g_parent_inode,
391 if (root_blknr == 0) {
392 first_block_no_of_root = previous_blknr;
395 previous_blknr = root_blknr;
398 status = ext4fs_devread((lbaint_t)first_block_no_of_root
400 0, fs->blksz, root_first_block_buffer);
404 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
406 dir = (struct ext2_dirent *)root_first_block_buffer;
408 while (dir->direntlen > 0) {
410 * blocksize-totalbytes because last directory length
411 * i.e. dir->direntlen is free availble space in the
412 * block that means it is a last entry of directory
416 /* traversing the each directory entry */
417 if (fs->blksz - totalbytes == dir->direntlen) {
418 if (strlen(filename) % 4 != 0)
419 padding_factor = 4 - (strlen(filename) % 4);
421 new_entry_byte_reqd = strlen(filename) +
422 sizeof(struct ext2_dirent) + padding_factor;
425 * update last directory entry length to its
426 * length because we are creating new directory
429 if (dir->namelen % 4 != 0)
430 padding_factor = 4 - (dir->namelen % 4);
432 last_entry_dirlen = dir->namelen +
433 sizeof(struct ext2_dirent) + padding_factor;
434 if ((fs->blksz - totalbytes - last_entry_dirlen) <
435 new_entry_byte_reqd) {
436 printf("1st Block Full:Allocate new block\n");
438 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
439 printf("Directory exceeds limit\n");
442 g_parent_inode->b.blocks.dir_blocks
443 [direct_blk_idx] = ext4fs_get_new_blk_no();
444 if (g_parent_inode->b.blocks.dir_blocks
445 [direct_blk_idx] == -1) {
446 printf("no block left to assign\n");
450 ((uint64_t)g_parent_inode->b.
451 blocks.dir_blocks[direct_blk_idx] *
452 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
453 g_parent_inode->size =
454 g_parent_inode->size + fs->blksz;
455 g_parent_inode->blockcnt =
456 g_parent_inode->blockcnt + fs->sect_perblk;
457 if (ext4fs_put_metadata
458 (root_first_block_buffer,
459 first_block_no_of_root))
463 dir->direntlen = last_entry_dirlen;
467 templength = dir->direntlen;
468 totalbytes = totalbytes + templength;
469 sizeof_void_space = check_void_in_dentry(dir, filename);
470 if (sizeof_void_space)
473 dir = (struct ext2_dirent *)((char *)dir + templength);
476 /* make a pointer ready for creating next directory entry */
477 templength = dir->direntlen;
478 totalbytes = totalbytes + templength;
479 dir = (struct ext2_dirent *)((char *)dir + templength);
481 /* get the next available inode number */
482 inodeno = ext4fs_get_new_inode_no();
484 printf("no inode left to assign\n");
487 dir->inode = inodeno;
488 if (sizeof_void_space)
489 dir->direntlen = sizeof_void_space;
491 dir->direntlen = fs->blksz - totalbytes;
493 dir->namelen = strlen(filename);
494 dir->filetype = FILETYPE_REG; /* regular file */
495 temp_dir = (char *)dir;
496 temp_dir = temp_dir + sizeof(struct ext2_dirent);
497 memcpy(temp_dir, filename, strlen(filename));
501 /* update or write the 1st block of root inode */
502 if (ext4fs_put_metadata(root_first_block_buffer,
503 first_block_no_of_root))
508 free(root_first_block_buffer);
511 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
521 unsigned char *block_buffer = NULL;
522 struct ext2_dirent *dir = NULL;
523 struct ext2_dirent *previous_dir = NULL;
524 struct ext_filesystem *fs = get_fs();
526 /* read the block no allocated to a file */
527 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
529 blknr = read_allocated_block(parent_inode, direct_blk_idx);
533 /* read the blocks of parenet inode */
534 block_buffer = zalloc(fs->blksz);
538 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
539 0, fs->blksz, (char *)block_buffer);
543 dir = (struct ext2_dirent *)block_buffer;
546 while (dir->direntlen >= 0) {
548 * blocksize-totalbytes because last directory
549 * length i.e.,*dir->direntlen is free availble
550 * space in the block that means
551 * it is a last entry of directory entry
553 if (strlen(dirname) == dir->namelen) {
554 if (strncmp(dirname, ptr +
555 sizeof(struct ext2_dirent),
556 dir->namelen) == 0) {
557 previous_dir->direntlen +=
559 inodeno = dir->inode;
566 if (fs->blksz - totalbytes == dir->direntlen)
569 /* traversing the each directory entry */
570 templength = dir->direntlen;
571 totalbytes = totalbytes + templength;
573 dir = (struct ext2_dirent *)((char *)dir + templength);
593 static int find_dir_depth(char *dirname)
595 char *token = strtok(dirname, "/");
597 while (token != NULL) {
598 token = strtok(NULL, "/");
601 return count + 1 + 1;
603 * for example for string /home/temp
604 * depth=home(1)+temp(1)+1 extra for NULL;
609 static int parse_path(char **arr, char *dirname)
611 char *token = strtok(dirname, "/");
615 arr[i] = zalloc(strlen("/") + 1);
621 /* add each path entry after root */
622 while (token != NULL) {
623 arr[i] = zalloc(strlen(token) + 1);
626 memcpy(arr[i++], token, strlen(token));
627 token = strtok(NULL, "/");
634 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
636 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
643 * Function: ext4fs_get_parent_inode_num
644 * Return Value: inode Number of the parent directory of file/Directory to be
646 * dirname : Input parmater, input path name of the file/directory to be created
647 * dname : Output parameter, to be filled with the name of the directory
648 * extracted from dirname
650 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
654 int matched_inode_no;
655 int result_inode_no = -1;
657 char *depth_dirname = NULL;
658 char *parse_dirname = NULL;
659 struct ext2_inode *parent_inode = NULL;
660 struct ext2_inode *first_inode = NULL;
661 struct ext2_inode temp_inode;
663 if (*dirname != '/') {
664 printf("Please supply Absolute path\n");
668 /* TODO: input validation make equivalent to linux */
669 depth_dirname = zalloc(strlen(dirname) + 1);
673 memcpy(depth_dirname, dirname, strlen(dirname));
674 depth = find_dir_depth(depth_dirname);
675 parse_dirname = zalloc(strlen(dirname) + 1);
678 memcpy(parse_dirname, dirname, strlen(dirname));
680 /* allocate memory for each directory level */
681 ptr = zalloc((depth) * sizeof(char *));
684 if (parse_path(ptr, parse_dirname))
686 parent_inode = zalloc(sizeof(struct ext2_inode));
689 first_inode = zalloc(sizeof(struct ext2_inode));
692 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
693 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
695 result_inode_no = EXT2_ROOT_INO;
696 for (i = 1; i < depth; i++) {
697 matched_inode_no = search_dir(parent_inode, ptr[i]);
698 if (matched_inode_no == -1) {
699 if (ptr[i + 1] == NULL && i == 1) {
700 result_inode_no = EXT2_ROOT_INO;
703 if (ptr[i + 1] == NULL)
705 printf("Invalid path\n");
706 result_inode_no = -1;
710 if (ptr[i + 1] != NULL) {
711 memset(parent_inode, '\0',
712 sizeof(struct ext2_inode));
713 if (ext4fs_iget(matched_inode_no,
715 result_inode_no = -1;
718 result_inode_no = matched_inode_no;
727 matched_inode_no = search_dir(first_inode, ptr[i]);
729 matched_inode_no = search_dir(parent_inode, ptr[i]);
731 if (matched_inode_no != -1) {
732 ext4fs_iget(matched_inode_no, &temp_inode);
733 if (temp_inode.mode & S_IFDIR) {
734 printf("It is a Directory\n");
735 result_inode_no = -1;
740 if (strlen(ptr[i]) > 256) {
741 result_inode_no = -1;
744 memcpy(dname, ptr[i], strlen(ptr[i]));
753 return result_inode_no;
756 static int check_filename(char *filename, unsigned int blknr)
758 unsigned int first_block_no_of_root;
763 char *root_first_block_buffer = NULL;
764 char *root_first_block_addr = NULL;
765 struct ext2_dirent *dir = NULL;
766 struct ext2_dirent *previous_dir = NULL;
768 struct ext_filesystem *fs = get_fs();
770 /* get the first block of root */
771 first_block_no_of_root = blknr;
772 root_first_block_buffer = zalloc(fs->blksz);
773 if (!root_first_block_buffer)
775 root_first_block_addr = root_first_block_buffer;
776 status = ext4fs_devread((lbaint_t)first_block_no_of_root *
778 fs->blksz, root_first_block_buffer);
782 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
784 dir = (struct ext2_dirent *)root_first_block_buffer;
787 while (dir->direntlen >= 0) {
789 * blocksize-totalbytes because last
790 * directory length i.e., *dir->direntlen
791 * is free availble space in the block that
792 * means it is a last entry of directory entry
794 if (strlen(filename) == dir->namelen) {
795 if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
796 dir->namelen) == 0) {
797 printf("file found deleting\n");
798 previous_dir->direntlen += dir->direntlen;
799 inodeno = dir->inode;
806 if (fs->blksz - totalbytes == dir->direntlen)
809 /* traversing the each directory entry */
810 templength = dir->direntlen;
811 totalbytes = totalbytes + templength;
813 dir = (struct ext2_dirent *)((char *)dir + templength);
819 if (ext4fs_put_metadata(root_first_block_addr,
820 first_block_no_of_root))
825 free(root_first_block_buffer);
830 int ext4fs_filename_check(char *filename)
832 short direct_blk_idx = 0;
836 /* read the block no allocated to a file */
837 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
839 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
842 inodeno = check_filename(filename, blknr);
850 long int ext4fs_get_new_blk_no(void)
856 static int prev_bg_bitmap_index = -1;
857 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
858 struct ext_filesystem *fs = get_fs();
859 char *journal_buffer = zalloc(fs->blksz);
860 char *zero_buffer = zalloc(fs->blksz);
861 if (!journal_buffer || !zero_buffer)
863 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
865 if (fs->first_pass_bbmap == 0) {
866 for (i = 0; i < fs->no_blkgrp; i++) {
867 if (bgd[i].free_blocks) {
868 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
869 put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
870 (uint64_t)fs->blksz)),
871 zero_buffer, fs->blksz);
874 bg_flags & ~EXT4_BG_BLOCK_UNINIT;
875 memcpy(fs->blk_bmaps[i], zero_buffer,
879 _get_new_blk_no(fs->blk_bmaps[i]);
880 if (fs->curr_blkno == -1)
881 /* if block bitmap is completely fill */
883 fs->curr_blkno = fs->curr_blkno +
885 fs->first_pass_bbmap++;
886 bgd[i].free_blocks--;
887 fs->sb->free_blocks--;
888 status = ext4fs_devread((lbaint_t)
895 if (ext4fs_log_journal(journal_buffer,
900 debug("no space left on block group %d\n", i);
908 /* get the blockbitmap index respective to blockno */
909 bg_idx = fs->curr_blkno / blk_per_grp;
910 if (fs->blksz == 1024) {
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; total_remaining_blocks && 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--;
1397 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1399 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1401 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1403 *total_no_of_block += no_blks_reqd;
1408 static struct ext4_extent_header *ext4fs_get_extent_block
1409 (struct ext2_data *data, char *buf,
1410 struct ext4_extent_header *ext_block,
1411 uint32_t fileblock, int log2_blksz)
1413 struct ext4_extent_idx *index;
1414 unsigned long long block;
1415 int blksz = EXT2_BLOCK_SIZE(data);
1419 index = (struct ext4_extent_idx *)(ext_block + 1);
1421 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1424 if (ext_block->eh_depth == 0)
1429 if (i >= le16_to_cpu(ext_block->eh_entries))
1431 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1436 block = le16_to_cpu(index[i].ei_leaf_hi);
1437 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1439 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1441 ext_block = (struct ext4_extent_header *)buf;
1447 static int ext4fs_blockgroup
1448 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1451 unsigned int blkoff, desc_per_blk;
1452 int log2blksz = get_fs()->dev_desc->log2blksz;
1454 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1456 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1457 group / desc_per_blk;
1458 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1460 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1461 group, blkno, blkoff);
1463 return ext4fs_devread((lbaint_t)blkno <<
1464 (LOG2_BLOCK_SIZE(data) - log2blksz),
1465 blkoff, sizeof(struct ext2_block_group),
1469 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1471 struct ext2_block_group blkgrp;
1472 struct ext2_sblock *sblock = &data->sblock;
1473 struct ext_filesystem *fs = get_fs();
1474 int log2blksz = get_fs()->dev_desc->log2blksz;
1475 int inodes_per_block, status;
1477 unsigned int blkoff;
1479 /* It is easier to calculate if the first inode is 0. */
1481 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1482 (sblock->inodes_per_group), &blkgrp);
1486 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1487 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1488 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1489 blkoff = (ino % inodes_per_block) * fs->inodesz;
1490 /* Read the inode. */
1491 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1493 sizeof(struct ext2_inode), (char *)inode);
1500 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1507 long int perblock_parent;
1508 long int perblock_child;
1509 unsigned long long start;
1510 /* get the blocksize of the filesystem */
1511 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1512 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1513 - get_fs()->dev_desc->log2blksz;
1515 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1516 char *buf = zalloc(blksz);
1519 struct ext4_extent_header *ext_block;
1520 struct ext4_extent *extent;
1523 ext4fs_get_extent_block(ext4fs_root, buf,
1524 (struct ext4_extent_header *)
1525 inode->b.blocks.dir_blocks,
1526 fileblock, log2_blksz);
1528 printf("invalid extent block\n");
1533 extent = (struct ext4_extent *)(ext_block + 1);
1537 if (i >= le16_to_cpu(ext_block->eh_entries))
1539 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1541 fileblock -= le32_to_cpu(extent[i].ee_block);
1542 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1547 start = le16_to_cpu(extent[i].ee_start_hi);
1548 start = (start << 32) +
1549 le32_to_cpu(extent[i].ee_start_lo);
1551 return fileblock + start;
1554 printf("Extent Error\n");
1559 /* Direct blocks. */
1560 if (fileblock < INDIRECT_BLOCKS)
1561 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1564 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1565 if (ext4fs_indir1_block == NULL) {
1566 ext4fs_indir1_block = zalloc(blksz);
1567 if (ext4fs_indir1_block == NULL) {
1568 printf("** SI ext2fs read block (indir 1)"
1569 "malloc failed. **\n");
1572 ext4fs_indir1_size = blksz;
1573 ext4fs_indir1_blkno = -1;
1575 if (blksz != ext4fs_indir1_size) {
1576 free(ext4fs_indir1_block);
1577 ext4fs_indir1_block = NULL;
1578 ext4fs_indir1_size = 0;
1579 ext4fs_indir1_blkno = -1;
1580 ext4fs_indir1_block = zalloc(blksz);
1581 if (ext4fs_indir1_block == NULL) {
1582 printf("** SI ext2fs read block (indir 1):"
1583 "malloc failed. **\n");
1586 ext4fs_indir1_size = blksz;
1588 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1589 log2_blksz) != ext4fs_indir1_blkno) {
1591 ext4fs_devread((lbaint_t)__le32_to_cpu
1593 indir_block) << log2_blksz, 0,
1594 blksz, (char *)ext4fs_indir1_block);
1596 printf("** SI ext2fs read block (indir 1)"
1600 ext4fs_indir1_blkno =
1601 __le32_to_cpu(inode->b.blocks.
1602 indir_block) << log2_blksz;
1604 blknr = __le32_to_cpu(ext4fs_indir1_block
1605 [fileblock - INDIRECT_BLOCKS]);
1607 /* Double indirect. */
1608 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1609 (blksz / 4 + 1)))) {
1611 long int perblock = blksz / 4;
1612 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1614 if (ext4fs_indir1_block == NULL) {
1615 ext4fs_indir1_block = zalloc(blksz);
1616 if (ext4fs_indir1_block == NULL) {
1617 printf("** DI ext2fs read block (indir 2 1)"
1618 "malloc failed. **\n");
1621 ext4fs_indir1_size = blksz;
1622 ext4fs_indir1_blkno = -1;
1624 if (blksz != ext4fs_indir1_size) {
1625 free(ext4fs_indir1_block);
1626 ext4fs_indir1_block = NULL;
1627 ext4fs_indir1_size = 0;
1628 ext4fs_indir1_blkno = -1;
1629 ext4fs_indir1_block = zalloc(blksz);
1630 if (ext4fs_indir1_block == NULL) {
1631 printf("** DI ext2fs read block (indir 2 1)"
1632 "malloc failed. **\n");
1635 ext4fs_indir1_size = blksz;
1637 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1638 log2_blksz) != ext4fs_indir1_blkno) {
1640 ext4fs_devread((lbaint_t)__le32_to_cpu
1642 double_indir_block) << log2_blksz,
1644 (char *)ext4fs_indir1_block);
1646 printf("** DI ext2fs read block (indir 2 1)"
1650 ext4fs_indir1_blkno =
1651 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1655 if (ext4fs_indir2_block == NULL) {
1656 ext4fs_indir2_block = zalloc(blksz);
1657 if (ext4fs_indir2_block == NULL) {
1658 printf("** DI ext2fs read block (indir 2 2)"
1659 "malloc failed. **\n");
1662 ext4fs_indir2_size = blksz;
1663 ext4fs_indir2_blkno = -1;
1665 if (blksz != ext4fs_indir2_size) {
1666 free(ext4fs_indir2_block);
1667 ext4fs_indir2_block = NULL;
1668 ext4fs_indir2_size = 0;
1669 ext4fs_indir2_blkno = -1;
1670 ext4fs_indir2_block = zalloc(blksz);
1671 if (ext4fs_indir2_block == NULL) {
1672 printf("** DI ext2fs read block (indir 2 2)"
1673 "malloc failed. **\n");
1676 ext4fs_indir2_size = blksz;
1678 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1679 log2_blksz) != ext4fs_indir2_blkno) {
1680 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1681 (ext4fs_indir1_block
1683 perblock]) << log2_blksz, 0,
1685 (char *)ext4fs_indir2_block);
1687 printf("** DI ext2fs read block (indir 2 2)"
1691 ext4fs_indir2_blkno =
1692 __le32_to_cpu(ext4fs_indir1_block[rblock
1697 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1699 /* Tripple indirect. */
1701 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1702 (blksz / 4 * blksz / 4));
1703 perblock_child = blksz / 4;
1704 perblock_parent = ((blksz / 4) * (blksz / 4));
1706 if (ext4fs_indir1_block == NULL) {
1707 ext4fs_indir1_block = zalloc(blksz);
1708 if (ext4fs_indir1_block == NULL) {
1709 printf("** TI ext2fs read block (indir 2 1)"
1710 "malloc failed. **\n");
1713 ext4fs_indir1_size = blksz;
1714 ext4fs_indir1_blkno = -1;
1716 if (blksz != ext4fs_indir1_size) {
1717 free(ext4fs_indir1_block);
1718 ext4fs_indir1_block = NULL;
1719 ext4fs_indir1_size = 0;
1720 ext4fs_indir1_blkno = -1;
1721 ext4fs_indir1_block = zalloc(blksz);
1722 if (ext4fs_indir1_block == NULL) {
1723 printf("** TI ext2fs read block (indir 2 1)"
1724 "malloc failed. **\n");
1727 ext4fs_indir1_size = blksz;
1729 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1730 log2_blksz) != ext4fs_indir1_blkno) {
1731 status = ext4fs_devread
1733 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1734 << log2_blksz, 0, blksz,
1735 (char *)ext4fs_indir1_block);
1737 printf("** TI ext2fs read block (indir 2 1)"
1741 ext4fs_indir1_blkno =
1742 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1746 if (ext4fs_indir2_block == NULL) {
1747 ext4fs_indir2_block = zalloc(blksz);
1748 if (ext4fs_indir2_block == NULL) {
1749 printf("** TI ext2fs read block (indir 2 2)"
1750 "malloc failed. **\n");
1753 ext4fs_indir2_size = blksz;
1754 ext4fs_indir2_blkno = -1;
1756 if (blksz != ext4fs_indir2_size) {
1757 free(ext4fs_indir2_block);
1758 ext4fs_indir2_block = NULL;
1759 ext4fs_indir2_size = 0;
1760 ext4fs_indir2_blkno = -1;
1761 ext4fs_indir2_block = zalloc(blksz);
1762 if (ext4fs_indir2_block == NULL) {
1763 printf("** TI ext2fs read block (indir 2 2)"
1764 "malloc failed. **\n");
1767 ext4fs_indir2_size = blksz;
1769 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1770 perblock_parent]) <<
1772 != ext4fs_indir2_blkno) {
1773 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1774 (ext4fs_indir1_block
1776 perblock_parent]) <<
1777 log2_blksz, 0, blksz,
1778 (char *)ext4fs_indir2_block);
1780 printf("** TI ext2fs read block (indir 2 2)"
1784 ext4fs_indir2_blkno =
1785 __le32_to_cpu(ext4fs_indir1_block[rblock /
1790 if (ext4fs_indir3_block == NULL) {
1791 ext4fs_indir3_block = zalloc(blksz);
1792 if (ext4fs_indir3_block == NULL) {
1793 printf("** TI ext2fs read block (indir 2 2)"
1794 "malloc failed. **\n");
1797 ext4fs_indir3_size = blksz;
1798 ext4fs_indir3_blkno = -1;
1800 if (blksz != ext4fs_indir3_size) {
1801 free(ext4fs_indir3_block);
1802 ext4fs_indir3_block = NULL;
1803 ext4fs_indir3_size = 0;
1804 ext4fs_indir3_blkno = -1;
1805 ext4fs_indir3_block = zalloc(blksz);
1806 if (ext4fs_indir3_block == NULL) {
1807 printf("** TI ext2fs read block (indir 2 2)"
1808 "malloc failed. **\n");
1811 ext4fs_indir3_size = blksz;
1813 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1816 log2_blksz) != ext4fs_indir3_blkno) {
1818 ext4fs_devread((lbaint_t)__le32_to_cpu
1819 (ext4fs_indir2_block
1820 [(rblock / perblock_child)
1821 % (blksz / 4)]) << log2_blksz, 0,
1822 blksz, (char *)ext4fs_indir3_block);
1824 printf("** TI ext2fs read block (indir 2 2)"
1828 ext4fs_indir3_blkno =
1829 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1836 blknr = __le32_to_cpu(ext4fs_indir3_block
1837 [rblock % perblock_child]);
1839 debug("read_allocated_block %ld\n", blknr);
1845 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1848 * This function assures that for a file with the same name but different size
1849 * the sequential store on the ext4 filesystem will be correct.
1851 * In this function the global data, responsible for internal representation
1852 * of the ext4 data are initialized to the reset state. Without this, during
1853 * replacement of the smaller file with the bigger truncation of new file was
1856 void ext4fs_reinit_global(void)
1858 if (ext4fs_indir1_block != NULL) {
1859 free(ext4fs_indir1_block);
1860 ext4fs_indir1_block = NULL;
1861 ext4fs_indir1_size = 0;
1862 ext4fs_indir1_blkno = -1;
1864 if (ext4fs_indir2_block != NULL) {
1865 free(ext4fs_indir2_block);
1866 ext4fs_indir2_block = NULL;
1867 ext4fs_indir2_size = 0;
1868 ext4fs_indir2_blkno = -1;
1870 if (ext4fs_indir3_block != NULL) {
1871 free(ext4fs_indir3_block);
1872 ext4fs_indir3_block = NULL;
1873 ext4fs_indir3_size = 0;
1874 ext4fs_indir3_blkno = -1;
1877 void ext4fs_close(void)
1879 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1880 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1883 if (ext4fs_root != NULL) {
1888 ext4fs_reinit_global();
1891 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1892 struct ext2fs_node **fnode, int *ftype)
1894 unsigned int fpos = 0;
1897 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1901 printf("Iterate dir %s\n", name);
1902 #endif /* of DEBUG */
1903 if (!diro->inode_read) {
1904 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1908 /* Search the file. */
1909 while (fpos < __le32_to_cpu(diro->inode.size)) {
1910 struct ext2_dirent dirent;
1912 status = ext4fs_read_file(diro, fpos,
1913 sizeof(struct ext2_dirent),
1914 (char *)&dirent, &actread);
1918 if (dirent.namelen != 0) {
1919 char filename[dirent.namelen + 1];
1920 struct ext2fs_node *fdiro;
1921 int type = FILETYPE_UNKNOWN;
1923 status = ext4fs_read_file(diro,
1925 sizeof(struct ext2_dirent),
1926 dirent.namelen, filename,
1931 fdiro = zalloc(sizeof(struct ext2fs_node));
1935 fdiro->data = diro->data;
1936 fdiro->ino = __le32_to_cpu(dirent.inode);
1938 filename[dirent.namelen] = '\0';
1940 if (dirent.filetype != FILETYPE_UNKNOWN) {
1941 fdiro->inode_read = 0;
1943 if (dirent.filetype == FILETYPE_DIRECTORY)
1944 type = FILETYPE_DIRECTORY;
1945 else if (dirent.filetype == FILETYPE_SYMLINK)
1946 type = FILETYPE_SYMLINK;
1947 else if (dirent.filetype == FILETYPE_REG)
1948 type = FILETYPE_REG;
1950 status = ext4fs_read_inode(diro->data,
1958 fdiro->inode_read = 1;
1960 if ((__le16_to_cpu(fdiro->inode.mode) &
1961 FILETYPE_INO_MASK) ==
1962 FILETYPE_INO_DIRECTORY) {
1963 type = FILETYPE_DIRECTORY;
1964 } else if ((__le16_to_cpu(fdiro->inode.mode)
1965 & FILETYPE_INO_MASK) ==
1966 FILETYPE_INO_SYMLINK) {
1967 type = FILETYPE_SYMLINK;
1968 } else if ((__le16_to_cpu(fdiro->inode.mode)
1969 & FILETYPE_INO_MASK) ==
1971 type = FILETYPE_REG;
1975 printf("iterate >%s<\n", filename);
1976 #endif /* of DEBUG */
1977 if ((name != NULL) && (fnode != NULL)
1978 && (ftype != NULL)) {
1979 if (strcmp(filename, name) == 0) {
1985 if (fdiro->inode_read == 0) {
1986 status = ext4fs_read_inode(diro->data,
1994 fdiro->inode_read = 1;
1997 case FILETYPE_DIRECTORY:
2000 case FILETYPE_SYMLINK:
2011 __le32_to_cpu(fdiro->inode.size),
2016 fpos += __le16_to_cpu(dirent.direntlen);
2021 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2024 struct ext2fs_node *diro = node;
2028 if (!diro->inode_read) {
2029 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2033 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2037 if (__le32_to_cpu(diro->inode.size) <= 60) {
2038 strncpy(symlink, diro->inode.b.symlink,
2039 __le32_to_cpu(diro->inode.size));
2041 status = ext4fs_read_file(diro, 0,
2042 __le32_to_cpu(diro->inode.size),
2049 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2053 static int ext4fs_find_file1(const char *currpath,
2054 struct ext2fs_node *currroot,
2055 struct ext2fs_node **currfound, int *foundtype)
2057 char fpath[strlen(currpath) + 1];
2061 int type = FILETYPE_DIRECTORY;
2062 struct ext2fs_node *currnode = currroot;
2063 struct ext2fs_node *oldnode = currroot;
2065 strncpy(fpath, currpath, strlen(currpath) + 1);
2067 /* Remove all leading slashes. */
2068 while (*name == '/')
2072 *currfound = currnode;
2079 /* Extract the actual part from the pathname. */
2080 next = strchr(name, '/');
2082 /* Remove all leading slashes. */
2083 while (*next == '/')
2087 if (type != FILETYPE_DIRECTORY) {
2088 ext4fs_free_node(currnode, currroot);
2094 /* Iterate over the directory. */
2095 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2102 /* Read in the symlink and follow it. */
2103 if (type == FILETYPE_SYMLINK) {
2106 /* Test if the symlink does not loop. */
2107 if (++symlinknest == 8) {
2108 ext4fs_free_node(currnode, currroot);
2109 ext4fs_free_node(oldnode, currroot);
2113 symlink = ext4fs_read_symlink(currnode);
2114 ext4fs_free_node(currnode, currroot);
2117 ext4fs_free_node(oldnode, currroot);
2121 debug("Got symlink >%s<\n", symlink);
2123 if (symlink[0] == '/') {
2124 ext4fs_free_node(oldnode, currroot);
2125 oldnode = &ext4fs_root->diropen;
2128 /* Lookup the node the symlink points to. */
2129 status = ext4fs_find_file1(symlink, oldnode,
2135 ext4fs_free_node(oldnode, currroot);
2140 ext4fs_free_node(oldnode, currroot);
2142 /* Found the node! */
2143 if (!next || *next == '\0') {
2144 *currfound = currnode;
2153 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2154 struct ext2fs_node **foundnode, int expecttype)
2157 int foundtype = FILETYPE_DIRECTORY;
2163 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2167 /* Check if the node that was found was of the expected type. */
2168 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2170 else if ((expecttype == FILETYPE_DIRECTORY)
2171 && (foundtype != expecttype))
2177 int ext4fs_open(const char *filename, loff_t *len)
2179 struct ext2fs_node *fdiro = NULL;
2182 if (ext4fs_root == NULL)
2186 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2191 if (!fdiro->inode_read) {
2192 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2197 *len = __le32_to_cpu(fdiro->inode.size);
2198 ext4fs_file = fdiro;
2202 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2207 int ext4fs_mount(unsigned part_length)
2209 struct ext2_data *data;
2211 struct ext_filesystem *fs = get_fs();
2212 data = zalloc(SUPERBLOCK_SIZE);
2216 /* Read the superblock. */
2217 status = ext4_read_superblock((char *)&data->sblock);
2222 /* Make sure this is an ext2 filesystem. */
2223 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2226 if (__le32_to_cpu(data->sblock.revision_level == 0))
2229 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2231 debug("EXT2 rev %d, inode_size %d\n",
2232 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2234 data->diropen.data = data;
2235 data->diropen.ino = 2;
2236 data->diropen.inode_read = 1;
2237 data->inode = &data->diropen.inode;
2239 status = ext4fs_read_inode(data, 2, data->inode);
2247 printf("Failed to mount ext2 filesystem...\n");