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 and load support in Uboot.
8 * Ext4 read optimization taken from Open-Moko
12 * esd gmbh <www.esd-electronics.com>
13 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
15 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
16 * GRUB -- GRand Unified Bootloader
17 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
19 * ext4write : Based on generic ext4 protocol.
21 * SPDX-License-Identifier: GPL-2.0+
26 #include <linux/stat.h>
28 #include "ext4_common.h"
30 static void ext4fs_update(void)
33 ext4fs_update_journal();
34 struct ext_filesystem *fs = get_fs();
36 /* update super block */
37 put_ext4((uint64_t)(SUPERBLOCK_SIZE),
38 (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
40 /* update block groups */
41 for (i = 0; i < fs->no_blkgrp; i++) {
42 fs->bgd[i].bg_checksum = ext4fs_checksum_update(i);
43 put_ext4((uint64_t)((uint64_t)fs->bgd[i].block_id * (uint64_t)fs->blksz),
44 fs->blk_bmaps[i], fs->blksz);
47 /* update inode table groups */
48 for (i = 0; i < fs->no_blkgrp; i++) {
49 put_ext4((uint64_t) ((uint64_t)fs->bgd[i].inode_id * (uint64_t)fs->blksz),
50 fs->inode_bmaps[i], fs->blksz);
53 /* update the block group descriptor table */
54 put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz),
55 (struct ext2_block_group *)fs->gdtable,
56 (fs->blksz * fs->no_blk_pergdt));
58 ext4fs_dump_metadata();
64 int ext4fs_get_bgdtable(void)
68 struct ext_filesystem *fs = get_fs();
69 grp_desc_size = sizeof(struct ext2_block_group);
70 fs->no_blk_pergdt = (fs->no_blkgrp * grp_desc_size) / fs->blksz;
71 if ((fs->no_blkgrp * grp_desc_size) % fs->blksz)
74 /* allocate memory for gdtable */
75 fs->gdtable = zalloc(fs->blksz * fs->no_blk_pergdt);
78 /* read the group descriptor table */
79 status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk,
80 0, fs->blksz * fs->no_blk_pergdt, fs->gdtable);
84 if (ext4fs_log_gdt(fs->gdtable)) {
85 printf("Error in ext4fs_log_gdt\n");
97 static void delete_single_indirect_block(struct ext2_inode *inode)
99 struct ext2_block_group *bgd = NULL;
100 static int prev_bg_bmap_idx = -1;
105 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
106 struct ext_filesystem *fs = get_fs();
107 char *journal_buffer = zalloc(fs->blksz);
108 if (!journal_buffer) {
109 printf("No memory\n");
112 /* get block group descriptor table */
113 bgd = (struct ext2_block_group *)fs->gdtable;
115 /* deleting the single indirect block associated with inode */
116 if (inode->b.blocks.indir_block != 0) {
117 debug("SIPB releasing %u\n", inode->b.blocks.indir_block);
118 blknr = inode->b.blocks.indir_block;
119 bg_idx = blknr / blk_per_grp;
120 if (fs->blksz == 1024) {
121 remainder = blknr % blk_per_grp;
125 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
126 bgd[bg_idx].free_blocks++;
127 fs->sb->free_blocks++;
129 if (prev_bg_bmap_idx != bg_idx) {
131 ext4fs_devread((lbaint_t)bgd[bg_idx].block_id *
132 fs->sect_perblk, 0, fs->blksz,
136 if (ext4fs_log_journal
137 (journal_buffer, bgd[bg_idx].block_id))
139 prev_bg_bmap_idx = bg_idx;
143 free(journal_buffer);
146 static void delete_double_indirect_block(struct ext2_inode *inode)
150 static int prev_bg_bmap_idx = -1;
154 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
155 unsigned int *di_buffer = NULL;
156 unsigned int *DIB_start_addr = NULL;
157 struct ext2_block_group *bgd = NULL;
158 struct ext_filesystem *fs = get_fs();
159 char *journal_buffer = zalloc(fs->blksz);
160 if (!journal_buffer) {
161 printf("No memory\n");
164 /* get the block group descriptor table */
165 bgd = (struct ext2_block_group *)fs->gdtable;
167 if (inode->b.blocks.double_indir_block != 0) {
168 di_buffer = zalloc(fs->blksz);
170 printf("No memory\n");
173 DIB_start_addr = (unsigned int *)di_buffer;
174 blknr = inode->b.blocks.double_indir_block;
175 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
176 fs->blksz, (char *)di_buffer);
177 for (i = 0; i < fs->blksz / sizeof(int); i++) {
181 debug("DICB releasing %u\n", *di_buffer);
182 bg_idx = *di_buffer / blk_per_grp;
183 if (fs->blksz == 1024) {
184 remainder = *di_buffer % blk_per_grp;
188 ext4fs_reset_block_bmap(*di_buffer,
189 fs->blk_bmaps[bg_idx], bg_idx);
191 bgd[bg_idx].free_blocks++;
192 fs->sb->free_blocks++;
194 if (prev_bg_bmap_idx != bg_idx) {
195 status = ext4fs_devread((lbaint_t)
197 * fs->sect_perblk, 0,
203 if (ext4fs_log_journal(journal_buffer,
204 bgd[bg_idx].block_id))
206 prev_bg_bmap_idx = bg_idx;
210 /* removing the parent double indirect block */
211 blknr = inode->b.blocks.double_indir_block;
212 bg_idx = blknr / blk_per_grp;
213 if (fs->blksz == 1024) {
214 remainder = blknr % blk_per_grp;
218 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
219 bgd[bg_idx].free_blocks++;
220 fs->sb->free_blocks++;
222 if (prev_bg_bmap_idx != bg_idx) {
223 memset(journal_buffer, '\0', fs->blksz);
224 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id *
225 fs->sect_perblk, 0, fs->blksz,
230 if (ext4fs_log_journal(journal_buffer,
231 bgd[bg_idx].block_id))
233 prev_bg_bmap_idx = bg_idx;
235 debug("DIPB releasing %ld\n", blknr);
238 free(DIB_start_addr);
239 free(journal_buffer);
242 static void delete_triple_indirect_block(struct ext2_inode *inode)
246 static int prev_bg_bmap_idx = -1;
250 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
251 unsigned int *tigp_buffer = NULL;
252 unsigned int *tib_start_addr = NULL;
253 unsigned int *tip_buffer = NULL;
254 unsigned int *tipb_start_addr = NULL;
255 struct ext2_block_group *bgd = NULL;
256 struct ext_filesystem *fs = get_fs();
257 char *journal_buffer = zalloc(fs->blksz);
258 if (!journal_buffer) {
259 printf("No memory\n");
262 /* get block group descriptor table */
263 bgd = (struct ext2_block_group *)fs->gdtable;
265 if (inode->b.blocks.triple_indir_block != 0) {
266 tigp_buffer = zalloc(fs->blksz);
268 printf("No memory\n");
271 tib_start_addr = (unsigned int *)tigp_buffer;
272 blknr = inode->b.blocks.triple_indir_block;
273 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
274 fs->blksz, (char *)tigp_buffer);
275 for (i = 0; i < fs->blksz / sizeof(int); i++) {
276 if (*tigp_buffer == 0)
278 debug("tigp buffer releasing %u\n", *tigp_buffer);
280 tip_buffer = zalloc(fs->blksz);
283 tipb_start_addr = (unsigned int *)tip_buffer;
284 status = ext4fs_devread((lbaint_t)(*tigp_buffer) *
285 fs->sect_perblk, 0, fs->blksz,
287 for (j = 0; j < fs->blksz / sizeof(int); j++) {
288 if (*tip_buffer == 0)
290 bg_idx = *tip_buffer / blk_per_grp;
291 if (fs->blksz == 1024) {
292 remainder = *tip_buffer % blk_per_grp;
297 ext4fs_reset_block_bmap(*tip_buffer,
298 fs->blk_bmaps[bg_idx],
302 bgd[bg_idx].free_blocks++;
303 fs->sb->free_blocks++;
305 if (prev_bg_bmap_idx != bg_idx) {
309 bgd[bg_idx].block_id *
316 if (ext4fs_log_journal(journal_buffer,
320 prev_bg_bmap_idx = bg_idx;
323 free(tipb_start_addr);
324 tipb_start_addr = NULL;
327 * removing the grand parent blocks
328 * which is connected to inode
330 bg_idx = *tigp_buffer / blk_per_grp;
331 if (fs->blksz == 1024) {
332 remainder = *tigp_buffer % blk_per_grp;
336 ext4fs_reset_block_bmap(*tigp_buffer,
337 fs->blk_bmaps[bg_idx], bg_idx);
340 bgd[bg_idx].free_blocks++;
341 fs->sb->free_blocks++;
343 if (prev_bg_bmap_idx != bg_idx) {
344 memset(journal_buffer, '\0', fs->blksz);
346 ext4fs_devread((lbaint_t)
347 bgd[bg_idx].block_id *
349 fs->blksz, journal_buffer);
353 if (ext4fs_log_journal(journal_buffer,
354 bgd[bg_idx].block_id))
356 prev_bg_bmap_idx = bg_idx;
360 /* removing the grand parent triple indirect block */
361 blknr = inode->b.blocks.triple_indir_block;
362 bg_idx = blknr / blk_per_grp;
363 if (fs->blksz == 1024) {
364 remainder = blknr % blk_per_grp;
368 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
369 bgd[bg_idx].free_blocks++;
370 fs->sb->free_blocks++;
372 if (prev_bg_bmap_idx != bg_idx) {
373 memset(journal_buffer, '\0', fs->blksz);
374 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id *
375 fs->sect_perblk, 0, fs->blksz,
380 if (ext4fs_log_journal(journal_buffer,
381 bgd[bg_idx].block_id))
383 prev_bg_bmap_idx = bg_idx;
385 debug("tigp buffer itself releasing %ld\n", blknr);
388 free(tib_start_addr);
389 free(tipb_start_addr);
390 free(journal_buffer);
393 static int ext4fs_delete_file(int inodeno)
395 struct ext2_inode inode;
402 char *read_buffer = NULL;
403 char *start_block_address = NULL;
404 unsigned int no_blocks;
406 static int prev_bg_bmap_idx = -1;
407 unsigned int inodes_per_block;
410 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
411 unsigned int inode_per_grp = ext4fs_root->sblock.inodes_per_group;
412 struct ext2_inode *inode_buffer = NULL;
413 struct ext2_block_group *bgd = NULL;
414 struct ext_filesystem *fs = get_fs();
415 char *journal_buffer = zalloc(fs->blksz);
418 /* get the block group descriptor table */
419 bgd = (struct ext2_block_group *)fs->gdtable;
420 status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
424 /* read the block no allocated to a file */
425 no_blocks = inode.size / fs->blksz;
426 if (inode.size % fs->blksz)
429 if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
430 struct ext2fs_node *node_inode =
431 zalloc(sizeof(struct ext2fs_node));
434 node_inode->data = ext4fs_root;
435 node_inode->ino = inodeno;
436 node_inode->inode_read = 0;
437 memcpy(&(node_inode->inode), &inode, sizeof(struct ext2_inode));
439 for (i = 0; i < no_blocks; i++) {
440 blknr = read_allocated_block(&(node_inode->inode), i);
441 bg_idx = blknr / blk_per_grp;
442 if (fs->blksz == 1024) {
443 remainder = blknr % blk_per_grp;
447 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
449 debug("EXT4_EXTENTS Block releasing %ld: %d\n",
452 bgd[bg_idx].free_blocks++;
453 fs->sb->free_blocks++;
456 if (prev_bg_bmap_idx != bg_idx) {
458 ext4fs_devread((lbaint_t)
459 bgd[bg_idx].block_id *
461 fs->blksz, journal_buffer);
464 if (ext4fs_log_journal(journal_buffer,
465 bgd[bg_idx].block_id))
467 prev_bg_bmap_idx = bg_idx;
476 delete_single_indirect_block(&inode);
477 delete_double_indirect_block(&inode);
478 delete_triple_indirect_block(&inode);
480 /* read the block no allocated to a file */
481 no_blocks = inode.size / fs->blksz;
482 if (inode.size % fs->blksz)
484 for (i = 0; i < no_blocks; i++) {
485 blknr = read_allocated_block(&inode, i);
486 bg_idx = blknr / blk_per_grp;
487 if (fs->blksz == 1024) {
488 remainder = blknr % blk_per_grp;
492 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
494 debug("ActualB releasing %ld: %d\n", blknr, bg_idx);
496 bgd[bg_idx].free_blocks++;
497 fs->sb->free_blocks++;
499 if (prev_bg_bmap_idx != bg_idx) {
500 memset(journal_buffer, '\0', fs->blksz);
501 status = ext4fs_devread((lbaint_t)
508 if (ext4fs_log_journal(journal_buffer,
509 bgd[bg_idx].block_id))
511 prev_bg_bmap_idx = bg_idx;
516 /* from the inode no to blockno */
517 inodes_per_block = fs->blksz / fs->inodesz;
518 ibmap_idx = inodeno / inode_per_grp;
520 /* get the block no */
522 blkno = __le32_to_cpu(bgd[ibmap_idx].inode_table_id) +
523 (inodeno % __le32_to_cpu(inode_per_grp)) / inodes_per_block;
525 /* get the offset of the inode */
526 blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
528 /* read the block no containing the inode */
529 read_buffer = zalloc(fs->blksz);
532 start_block_address = read_buffer;
533 status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
534 0, fs->blksz, read_buffer);
538 if (ext4fs_log_journal(read_buffer, blkno))
541 read_buffer = read_buffer + blkoff;
542 inode_buffer = (struct ext2_inode *)read_buffer;
543 memset(inode_buffer, '\0', sizeof(struct ext2_inode));
545 /* write the inode to original position in inode table */
546 if (ext4fs_put_metadata(start_block_address, blkno))
549 /* update the respective inode bitmaps */
551 ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
552 bgd[ibmap_idx].free_inodes++;
553 fs->sb->free_inodes++;
555 memset(journal_buffer, '\0', fs->blksz);
556 status = ext4fs_devread((lbaint_t)bgd[ibmap_idx].inode_id *
557 fs->sect_perblk, 0, fs->blksz, journal_buffer);
560 if (ext4fs_log_journal(journal_buffer, bgd[ibmap_idx].inode_id))
565 ext4fs_reinit_global();
567 if (ext4fs_init() != 0) {
568 printf("error in File System init\n");
572 free(start_block_address);
573 free(journal_buffer);
577 free(start_block_address);
578 free(journal_buffer);
583 int ext4fs_init(void)
587 unsigned int real_free_blocks = 0;
588 struct ext_filesystem *fs = get_fs();
591 fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
592 fs->inodesz = INODE_SIZE_FILESYSTEM(ext4fs_root);
593 fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
595 /* get the superblock */
596 fs->sb = zalloc(SUPERBLOCK_SIZE);
599 if (!ext4_read_superblock((char *)fs->sb))
603 if (ext4fs_init_journal())
606 /* get total no of blockgroups */
607 fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
608 (ext4fs_root->sblock.total_blocks -
609 ext4fs_root->sblock.first_data_block),
610 ext4fs_root->sblock.blocks_per_group);
612 /* get the block group descriptor table */
613 fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
614 if (ext4fs_get_bgdtable() == -1) {
615 printf("Error in getting the block group descriptor table\n");
618 fs->bgd = (struct ext2_block_group *)fs->gdtable;
620 /* load all the available bitmap block of the partition */
621 fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
624 for (i = 0; i < fs->no_blkgrp; i++) {
625 fs->blk_bmaps[i] = zalloc(fs->blksz);
626 if (!fs->blk_bmaps[i])
630 for (i = 0; i < fs->no_blkgrp; i++) {
632 ext4fs_devread((lbaint_t)fs->bgd[i].block_id *
634 fs->blksz, (char *)fs->blk_bmaps[i]);
639 /* load all the available inode bitmap of the partition */
640 fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
641 if (!fs->inode_bmaps)
643 for (i = 0; i < fs->no_blkgrp; i++) {
644 fs->inode_bmaps[i] = zalloc(fs->blksz);
645 if (!fs->inode_bmaps[i])
649 for (i = 0; i < fs->no_blkgrp; i++) {
650 status = ext4fs_devread((lbaint_t)fs->bgd[i].inode_id *
653 (char *)fs->inode_bmaps[i]);
659 * check filesystem consistency with free blocks of file system
660 * some time we observed that superblock freeblocks does not match
661 * with the blockgroups freeblocks when improper
662 * reboot of a linux kernel
664 for (i = 0; i < fs->no_blkgrp; i++)
665 real_free_blocks = real_free_blocks + fs->bgd[i].free_blocks;
666 if (real_free_blocks != fs->sb->free_blocks)
667 fs->sb->free_blocks = real_free_blocks;
676 void ext4fs_deinit(void)
679 struct ext2_inode inode_journal;
680 struct journal_superblock_t *jsb;
682 struct ext_filesystem *fs = get_fs();
685 char *temp_buff = zalloc(fs->blksz);
687 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
689 blknr = read_allocated_block(&inode_journal,
690 EXT2_JOURNAL_SUPERBLOCK);
691 ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
693 jsb = (struct journal_superblock_t *)temp_buff;
694 jsb->s_start = cpu_to_be32(0);
695 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
696 (struct journal_superblock_t *)temp_buff, fs->blksz);
699 ext4fs_free_journal();
701 /* get the superblock */
702 ext4_read_superblock((char *)fs->sb);
703 fs->sb->feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
704 put_ext4((uint64_t)(SUPERBLOCK_SIZE),
705 (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
710 for (i = 0; i < fs->no_blkgrp; i++) {
711 free(fs->blk_bmaps[i]);
712 fs->blk_bmaps[i] = NULL;
715 fs->blk_bmaps = NULL;
718 if (fs->inode_bmaps) {
719 for (i = 0; i < fs->no_blkgrp; i++) {
720 free(fs->inode_bmaps[i]);
721 fs->inode_bmaps[i] = NULL;
723 free(fs->inode_bmaps);
724 fs->inode_bmaps = NULL;
732 * reinitiliazed the global inode and
733 * block bitmap first execution check variables
735 fs->first_pass_ibmap = 0;
736 fs->first_pass_bbmap = 0;
737 fs->curr_inode_no = 0;
741 static int ext4fs_write_file(struct ext2_inode *file_inode,
742 int pos, unsigned int len, char *buf)
746 unsigned int filesize = __le32_to_cpu(file_inode->size);
747 struct ext_filesystem *fs = get_fs();
748 int log2blksz = fs->dev_desc->log2blksz;
749 int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
750 int previous_block_number = -1;
751 int delayed_start = 0;
752 int delayed_extent = 0;
753 int delayed_next = 0;
754 char *delayed_buf = NULL;
756 /* Adjust len so it we can't read past the end of the file. */
760 blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
762 for (i = pos / fs->blksz; i < blockcnt; i++) {
764 int blockend = fs->blksz;
766 blknr = read_allocated_block(file_inode, i);
770 blknr = blknr << log2_fs_blocksize;
773 if (previous_block_number != -1) {
774 if (delayed_next == blknr) {
775 delayed_extent += blockend;
776 delayed_next += blockend >> log2blksz;
779 ((uint64_t)delayed_start << log2blksz),
781 (uint32_t) delayed_extent);
782 previous_block_number = blknr;
783 delayed_start = blknr;
784 delayed_extent = blockend;
786 delayed_next = blknr +
787 (blockend >> log2blksz);
790 previous_block_number = blknr;
791 delayed_start = blknr;
792 delayed_extent = blockend;
794 delayed_next = blknr +
795 (blockend >> log2blksz);
798 if (previous_block_number != -1) {
800 put_ext4((uint64_t) ((uint64_t)delayed_start <<
803 (uint32_t) delayed_extent);
804 previous_block_number = -1;
806 memset(buf, 0, fs->blksz - skipfirst);
808 buf += fs->blksz - skipfirst;
810 if (previous_block_number != -1) {
812 put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
813 delayed_buf, (uint32_t) delayed_extent);
814 previous_block_number = -1;
820 int ext4fs_write(const char *fname, unsigned char *buffer,
821 unsigned long sizebytes)
824 struct ext2_inode *file_inode = NULL;
825 unsigned char *inode_buffer = NULL;
828 time_t timestamp = 0;
830 uint64_t bytes_reqd_for_file;
831 unsigned int blks_reqd_for_file;
832 unsigned int blocks_remaining;
833 int existing_file_inodeno;
834 char *temp_ptr = NULL;
835 long int itable_blkno;
836 long int parent_itable_blkno;
838 struct ext2_sblock *sblock = &(ext4fs_root->sblock);
839 unsigned int inodes_per_block;
840 unsigned int ibmap_idx;
841 struct ext_filesystem *fs = get_fs();
842 ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
843 memset(filename, 0x00, 256);
845 g_parent_inode = zalloc(sizeof(struct ext2_inode));
849 if (ext4fs_init() != 0) {
850 printf("error in File System init\n");
853 inodes_per_block = fs->blksz / fs->inodesz;
854 parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
855 if (parent_inodeno == -1)
857 if (ext4fs_iget(parent_inodeno, g_parent_inode))
859 /* check if the filename is already present in root */
860 existing_file_inodeno = ext4fs_filename_check(filename);
861 if (existing_file_inodeno != -1) {
862 ret = ext4fs_delete_file(existing_file_inodeno);
863 fs->first_pass_bbmap = 0;
866 fs->first_pass_ibmap = 0;
867 fs->curr_inode_no = 0;
871 /* calucalate how many blocks required */
872 bytes_reqd_for_file = sizebytes;
873 blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
874 if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
875 blks_reqd_for_file++;
876 debug("total bytes for a file %u\n", blks_reqd_for_file);
878 blocks_remaining = blks_reqd_for_file;
879 /* test for available space in partition */
880 if (fs->sb->free_blocks < blks_reqd_for_file) {
881 printf("Not enough space on partition !!!\n");
885 ext4fs_update_parent_dentry(filename, &inodeno, FILETYPE_REG);
886 /* prepare file inode */
887 inode_buffer = zalloc(fs->inodesz);
890 file_inode = (struct ext2_inode *)inode_buffer;
891 file_inode->mode = S_IFREG | S_IRWXU |
892 S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH;
893 /* ToDo: Update correct time */
894 file_inode->mtime = timestamp;
895 file_inode->atime = timestamp;
896 file_inode->ctime = timestamp;
897 file_inode->nlinks = 1;
898 file_inode->size = sizebytes;
900 /* Allocate data blocks */
901 ext4fs_allocate_blocks(file_inode, blocks_remaining,
902 &blks_reqd_for_file);
903 file_inode->blockcnt = (blks_reqd_for_file * fs->blksz) >>
904 fs->dev_desc->log2blksz;
906 temp_ptr = zalloc(fs->blksz);
909 ibmap_idx = inodeno / ext4fs_root->sblock.inodes_per_group;
911 itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
912 (inodeno % __le32_to_cpu(sblock->inodes_per_group)) /
914 blkoff = (inodeno % inodes_per_block) * fs->inodesz;
915 ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
917 if (ext4fs_log_journal(temp_ptr, itable_blkno))
920 memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
921 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
923 /* copy the file content into data blocks */
924 if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
925 printf("Error in copying content\n");
928 ibmap_idx = parent_inodeno / ext4fs_root->sblock.inodes_per_group;
930 parent_itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
932 __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
933 blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
934 if (parent_itable_blkno != itable_blkno) {
935 memset(temp_ptr, '\0', fs->blksz);
936 ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
937 0, fs->blksz, temp_ptr);
938 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
941 memcpy(temp_ptr + blkoff, g_parent_inode,
942 sizeof(struct ext2_inode));
943 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
948 * If parent and child fall in same inode table block
949 * both should be kept in 1 buffer
951 memcpy(temp_ptr + blkoff, g_parent_inode,
952 sizeof(struct ext2_inode));
954 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
961 fs->first_pass_bbmap = 0;
963 fs->first_pass_ibmap = 0;
964 fs->curr_inode_no = 0;
966 free(g_parent_inode);
967 g_parent_inode = NULL;
973 free(g_parent_inode);
974 g_parent_inode = NULL;
979 int ext4_write_file(const char *filename, void *buf, loff_t offset,
980 loff_t len, loff_t *actwrite)
985 printf("** Cannot support non-zero offset **\n");
989 /* mount the filesystem */
990 if (!ext4fs_mount(0)) {
991 printf("** Error Bad ext4 partition **\n");
995 ret = ext4fs_write(filename, buf, len);
998 printf("** Error ext4fs_write() **\n");