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 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2 of the License, or
24 * (at your option) any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
38 #include <ext_common.h>
40 #include <linux/stat.h>
41 #include <linux/time.h>
42 #include <asm/byteorder.h>
43 #include "ext4_common.h"
45 int ext4fs_symlinknest;
46 struct ext_filesystem ext_fs;
48 struct ext_filesystem *get_fs(void)
53 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
55 if ((node != &ext4fs_root->diropen) && (node != currroot))
60 * Taken from openmoko-kernel mailing list: By Andy green
61 * Optimized read file API : collects and defers contiguous sector
62 * reads into one potentially more efficient larger sequential read action
64 int ext4fs_read_file(struct ext2fs_node *node, int pos,
65 unsigned int len, char *buf)
69 int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data);
70 int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS);
71 unsigned int filesize = __le32_to_cpu(node->inode.size);
72 int previous_block_number = -1;
73 int delayed_start = 0;
74 int delayed_extent = 0;
75 int delayed_skipfirst = 0;
77 char *delayed_buf = NULL;
80 /* Adjust len so it we can't read past the end of the file. */
84 blockcnt = ((len + pos) + blocksize - 1) / blocksize;
86 for (i = pos / blocksize; i < blockcnt; i++) {
88 int blockoff = pos % blocksize;
89 int blockend = blocksize;
91 blknr = read_allocated_block(&(node->inode), i);
95 blknr = blknr << log2blocksize;
98 if (i == blockcnt - 1) {
99 blockend = (len + pos) % blocksize;
101 /* The last portion is exactly blocksize. */
103 blockend = blocksize;
107 if (i == pos / blocksize) {
108 skipfirst = blockoff;
109 blockend -= skipfirst;
114 if (previous_block_number != -1) {
115 if (delayed_next == blknr) {
116 delayed_extent += blockend;
117 delayed_next += blockend >> SECTOR_BITS;
119 status = ext4fs_devread(delayed_start,
125 previous_block_number = blknr;
126 delayed_start = blknr;
127 delayed_extent = blockend;
128 delayed_skipfirst = skipfirst;
130 delayed_next = blknr +
131 (blockend >> SECTOR_BITS);
134 previous_block_number = blknr;
135 delayed_start = blknr;
136 delayed_extent = blockend;
137 delayed_skipfirst = skipfirst;
139 delayed_next = blknr +
140 (blockend >> SECTOR_BITS);
143 if (previous_block_number != -1) {
145 status = ext4fs_devread(delayed_start,
151 previous_block_number = -1;
153 memset(buf, 0, blocksize - skipfirst);
155 buf += blocksize - skipfirst;
157 if (previous_block_number != -1) {
159 status = ext4fs_devread(delayed_start,
160 delayed_skipfirst, delayed_extent,
164 previous_block_number = -1;
170 int ext4fs_ls(const char *dirname)
172 struct ext2fs_node *dirnode;
178 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
181 printf("** Can not find directory. **\n");
185 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
186 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
191 int ext4fs_read(char *buf, unsigned len)
193 if (ext4fs_root == NULL || ext4fs_file == NULL)
196 return ext4fs_read_file(ext4fs_file, 0, len, buf);
199 #if defined(CONFIG_EXT4_WRITE)
200 static void ext4fs_update(void)
203 ext4fs_update_journal();
204 struct ext_filesystem *fs = get_fs();
206 /* update super block */
207 put_ext4((uint64_t)(SUPERBLOCK_SIZE),
208 (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
210 /* update block groups */
211 for (i = 0; i < fs->no_blkgrp; i++) {
212 fs->bgd[i].bg_checksum = ext4fs_checksum_update(i);
213 put_ext4((uint64_t)(fs->bgd[i].block_id * fs->blksz),
214 fs->blk_bmaps[i], fs->blksz);
217 /* update inode table groups */
218 for (i = 0; i < fs->no_blkgrp; i++) {
219 put_ext4((uint64_t) (fs->bgd[i].inode_id * fs->blksz),
220 fs->inode_bmaps[i], fs->blksz);
223 /* update the block group descriptor table */
224 put_ext4((uint64_t)(fs->gdtable_blkno * fs->blksz),
225 (struct ext2_block_group *)fs->gdtable,
226 (fs->blksz * fs->no_blk_pergdt));
228 ext4fs_dump_metadata();
234 int ext4fs_get_bgdtable(void)
238 struct ext_filesystem *fs = get_fs();
239 grp_desc_size = sizeof(struct ext2_block_group);
240 fs->no_blk_pergdt = (fs->no_blkgrp * grp_desc_size) / fs->blksz;
241 if ((fs->no_blkgrp * grp_desc_size) % fs->blksz)
244 /* allocate memory for gdtable */
245 fs->gdtable = zalloc(fs->blksz * fs->no_blk_pergdt);
248 /* read the group descriptor table */
249 status = ext4fs_devread(fs->gdtable_blkno * fs->sect_perblk, 0,
250 fs->blksz * fs->no_blk_pergdt, fs->gdtable);
254 if (ext4fs_log_gdt(fs->gdtable)) {
255 printf("Error in ext4fs_log_gdt\n");
267 static void delete_single_indirect_block(struct ext2_inode *inode)
269 struct ext2_block_group *bgd = NULL;
270 static int prev_bg_bmap_idx = -1;
275 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
276 struct ext_filesystem *fs = get_fs();
277 char *journal_buffer = zalloc(fs->blksz);
278 if (!journal_buffer) {
279 printf("No memory\n");
282 /* get block group descriptor table */
283 bgd = (struct ext2_block_group *)fs->gdtable;
285 /* deleting the single indirect block associated with inode */
286 if (inode->b.blocks.indir_block != 0) {
287 debug("SIPB releasing %u\n", inode->b.blocks.indir_block);
288 blknr = inode->b.blocks.indir_block;
289 if (fs->blksz != 1024) {
290 bg_idx = blknr / blk_per_grp;
292 bg_idx = blknr / blk_per_grp;
293 remainder = blknr % blk_per_grp;
297 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
298 bgd[bg_idx].free_blocks++;
299 fs->sb->free_blocks++;
301 if (prev_bg_bmap_idx != bg_idx) {
303 ext4fs_devread(bgd[bg_idx].block_id *
304 fs->sect_perblk, 0, fs->blksz,
308 if (ext4fs_log_journal
309 (journal_buffer, bgd[bg_idx].block_id))
311 prev_bg_bmap_idx = bg_idx;
315 free(journal_buffer);
318 static void delete_double_indirect_block(struct ext2_inode *inode)
322 static int prev_bg_bmap_idx = -1;
326 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
327 unsigned int *di_buffer = NULL;
328 unsigned int *DIB_start_addr = NULL;
329 struct ext2_block_group *bgd = NULL;
330 struct ext_filesystem *fs = get_fs();
331 char *journal_buffer = zalloc(fs->blksz);
332 if (!journal_buffer) {
333 printf("No memory\n");
336 /* get the block group descriptor table */
337 bgd = (struct ext2_block_group *)fs->gdtable;
339 if (inode->b.blocks.double_indir_block != 0) {
340 di_buffer = zalloc(fs->blksz);
342 printf("No memory\n");
345 DIB_start_addr = (unsigned int *)di_buffer;
346 blknr = inode->b.blocks.double_indir_block;
347 status = ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz,
349 for (i = 0; i < fs->blksz / sizeof(int); i++) {
353 debug("DICB releasing %u\n", *di_buffer);
354 if (fs->blksz != 1024) {
355 bg_idx = (*di_buffer) / blk_per_grp;
357 bg_idx = (*di_buffer) / blk_per_grp;
358 remainder = (*di_buffer) % blk_per_grp;
362 ext4fs_reset_block_bmap(*di_buffer,
363 fs->blk_bmaps[bg_idx], bg_idx);
365 bgd[bg_idx].free_blocks++;
366 fs->sb->free_blocks++;
368 if (prev_bg_bmap_idx != bg_idx) {
369 status = ext4fs_devread(bgd[bg_idx].block_id
370 * fs->sect_perblk, 0,
376 if (ext4fs_log_journal(journal_buffer,
377 bgd[bg_idx].block_id))
379 prev_bg_bmap_idx = bg_idx;
383 /* removing the parent double indirect block */
384 blknr = inode->b.blocks.double_indir_block;
385 if (fs->blksz != 1024) {
386 bg_idx = blknr / blk_per_grp;
388 bg_idx = blknr / blk_per_grp;
389 remainder = blknr % blk_per_grp;
393 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
394 bgd[bg_idx].free_blocks++;
395 fs->sb->free_blocks++;
397 if (prev_bg_bmap_idx != bg_idx) {
398 memset(journal_buffer, '\0', fs->blksz);
399 status = ext4fs_devread(bgd[bg_idx].block_id *
400 fs->sect_perblk, 0, fs->blksz,
405 if (ext4fs_log_journal(journal_buffer,
406 bgd[bg_idx].block_id))
408 prev_bg_bmap_idx = bg_idx;
410 debug("DIPB releasing %ld\n", blknr);
413 free(DIB_start_addr);
414 free(journal_buffer);
417 static void delete_triple_indirect_block(struct ext2_inode *inode)
421 static int prev_bg_bmap_idx = -1;
425 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
426 unsigned int *tigp_buffer = NULL;
427 unsigned int *tib_start_addr = NULL;
428 unsigned int *tip_buffer = NULL;
429 unsigned int *tipb_start_addr = NULL;
430 struct ext2_block_group *bgd = NULL;
431 struct ext_filesystem *fs = get_fs();
432 char *journal_buffer = zalloc(fs->blksz);
433 if (!journal_buffer) {
434 printf("No memory\n");
437 /* get block group descriptor table */
438 bgd = (struct ext2_block_group *)fs->gdtable;
440 if (inode->b.blocks.triple_indir_block != 0) {
441 tigp_buffer = zalloc(fs->blksz);
443 printf("No memory\n");
446 tib_start_addr = (unsigned int *)tigp_buffer;
447 blknr = inode->b.blocks.triple_indir_block;
448 status = ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz,
449 (char *)tigp_buffer);
450 for (i = 0; i < fs->blksz / sizeof(int); i++) {
451 if (*tigp_buffer == 0)
453 debug("tigp buffer releasing %u\n", *tigp_buffer);
455 tip_buffer = zalloc(fs->blksz);
458 tipb_start_addr = (unsigned int *)tip_buffer;
459 status = ext4fs_devread((*tigp_buffer) *
460 fs->sect_perblk, 0, fs->blksz,
462 for (j = 0; j < fs->blksz / sizeof(int); j++) {
463 if (*tip_buffer == 0)
465 if (fs->blksz != 1024) {
466 bg_idx = (*tip_buffer) / blk_per_grp;
468 bg_idx = (*tip_buffer) / blk_per_grp;
470 remainder = (*tip_buffer) % blk_per_grp;
475 ext4fs_reset_block_bmap(*tip_buffer,
476 fs->blk_bmaps[bg_idx],
480 bgd[bg_idx].free_blocks++;
481 fs->sb->free_blocks++;
483 if (prev_bg_bmap_idx != bg_idx) {
486 bgd[bg_idx].block_id *
493 if (ext4fs_log_journal(journal_buffer,
497 prev_bg_bmap_idx = bg_idx;
500 free(tipb_start_addr);
501 tipb_start_addr = NULL;
504 * removing the grand parent blocks
505 * which is connected to inode
507 if (fs->blksz != 1024) {
508 bg_idx = (*tigp_buffer) / blk_per_grp;
510 bg_idx = (*tigp_buffer) / blk_per_grp;
512 remainder = (*tigp_buffer) % blk_per_grp;
516 ext4fs_reset_block_bmap(*tigp_buffer,
517 fs->blk_bmaps[bg_idx], bg_idx);
520 bgd[bg_idx].free_blocks++;
521 fs->sb->free_blocks++;
523 if (prev_bg_bmap_idx != bg_idx) {
524 memset(journal_buffer, '\0', fs->blksz);
526 ext4fs_devread(bgd[bg_idx].block_id *
528 fs->blksz, journal_buffer);
532 if (ext4fs_log_journal(journal_buffer,
533 bgd[bg_idx].block_id))
535 prev_bg_bmap_idx = bg_idx;
539 /* removing the grand parent triple indirect block */
540 blknr = inode->b.blocks.triple_indir_block;
541 if (fs->blksz != 1024) {
542 bg_idx = blknr / blk_per_grp;
544 bg_idx = blknr / blk_per_grp;
545 remainder = blknr % blk_per_grp;
549 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
550 bgd[bg_idx].free_blocks++;
551 fs->sb->free_blocks++;
553 if (prev_bg_bmap_idx != bg_idx) {
554 memset(journal_buffer, '\0', fs->blksz);
555 status = ext4fs_devread(bgd[bg_idx].block_id *
556 fs->sect_perblk, 0, fs->blksz,
561 if (ext4fs_log_journal(journal_buffer,
562 bgd[bg_idx].block_id))
564 prev_bg_bmap_idx = bg_idx;
566 debug("tigp buffer itself releasing %ld\n", blknr);
569 free(tib_start_addr);
570 free(tipb_start_addr);
571 free(journal_buffer);
574 static int ext4fs_delete_file(int inodeno)
576 struct ext2_inode inode;
583 char *read_buffer = NULL;
584 char *start_block_address = NULL;
585 unsigned int no_blocks;
587 static int prev_bg_bmap_idx = -1;
588 unsigned int inodes_per_block;
591 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
592 unsigned int inode_per_grp = ext4fs_root->sblock.inodes_per_group;
593 struct ext2_inode *inode_buffer = NULL;
594 struct ext2_block_group *bgd = NULL;
595 struct ext_filesystem *fs = get_fs();
596 char *journal_buffer = zalloc(fs->blksz);
599 /* get the block group descriptor table */
600 bgd = (struct ext2_block_group *)fs->gdtable;
601 status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
605 /* read the block no allocated to a file */
606 no_blocks = inode.size / fs->blksz;
607 if (inode.size % fs->blksz)
610 if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
611 struct ext2fs_node *node_inode =
612 zalloc(sizeof(struct ext2fs_node));
615 node_inode->data = ext4fs_root;
616 node_inode->ino = inodeno;
617 node_inode->inode_read = 0;
618 memcpy(&(node_inode->inode), &inode, sizeof(struct ext2_inode));
620 for (i = 0; i < no_blocks; i++) {
621 blknr = read_allocated_block(&(node_inode->inode), i);
622 if (fs->blksz != 1024) {
623 bg_idx = blknr / blk_per_grp;
625 bg_idx = blknr / blk_per_grp;
626 remainder = blknr % blk_per_grp;
630 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
632 debug("EXT4_EXTENTS Block releasing %ld: %d\n",
635 bgd[bg_idx].free_blocks++;
636 fs->sb->free_blocks++;
639 if (prev_bg_bmap_idx != bg_idx) {
641 ext4fs_devread(bgd[bg_idx].block_id *
643 fs->blksz, journal_buffer);
646 if (ext4fs_log_journal(journal_buffer,
647 bgd[bg_idx].block_id))
649 prev_bg_bmap_idx = bg_idx;
658 delete_single_indirect_block(&inode);
659 delete_double_indirect_block(&inode);
660 delete_triple_indirect_block(&inode);
662 /* read the block no allocated to a file */
663 no_blocks = inode.size / fs->blksz;
664 if (inode.size % fs->blksz)
666 for (i = 0; i < no_blocks; i++) {
667 blknr = read_allocated_block(&inode, i);
668 if (fs->blksz != 1024) {
669 bg_idx = blknr / blk_per_grp;
671 bg_idx = blknr / blk_per_grp;
672 remainder = blknr % blk_per_grp;
676 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
678 debug("ActualB releasing %ld: %d\n", blknr, bg_idx);
680 bgd[bg_idx].free_blocks++;
681 fs->sb->free_blocks++;
683 if (prev_bg_bmap_idx != bg_idx) {
684 memset(journal_buffer, '\0', fs->blksz);
685 status = ext4fs_devread(bgd[bg_idx].block_id
691 if (ext4fs_log_journal(journal_buffer,
692 bgd[bg_idx].block_id))
694 prev_bg_bmap_idx = bg_idx;
699 /* from the inode no to blockno */
700 inodes_per_block = fs->blksz / fs->inodesz;
701 ibmap_idx = inodeno / inode_per_grp;
703 /* get the block no */
705 blkno = __le32_to_cpu(bgd[ibmap_idx].inode_table_id) +
706 (inodeno % __le32_to_cpu(inode_per_grp)) / inodes_per_block;
708 /* get the offset of the inode */
709 blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
711 /* read the block no containing the inode */
712 read_buffer = zalloc(fs->blksz);
715 start_block_address = read_buffer;
716 status = ext4fs_devread(blkno * fs->sect_perblk,
717 0, fs->blksz, read_buffer);
721 if (ext4fs_log_journal(read_buffer, blkno))
724 read_buffer = read_buffer + blkoff;
725 inode_buffer = (struct ext2_inode *)read_buffer;
726 memset(inode_buffer, '\0', sizeof(struct ext2_inode));
728 /* write the inode to original position in inode table */
729 if (ext4fs_put_metadata(start_block_address, blkno))
732 /* update the respective inode bitmaps */
734 ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
735 bgd[ibmap_idx].free_inodes++;
736 fs->sb->free_inodes++;
738 memset(journal_buffer, '\0', fs->blksz);
739 status = ext4fs_devread(bgd[ibmap_idx].inode_id *
740 fs->sect_perblk, 0, fs->blksz, journal_buffer);
743 if (ext4fs_log_journal(journal_buffer, bgd[ibmap_idx].inode_id))
749 if (ext4fs_init() != 0) {
750 printf("error in File System init\n");
754 free(start_block_address);
755 free(journal_buffer);
759 free(start_block_address);
760 free(journal_buffer);
765 int ext4fs_init(void)
769 unsigned int real_free_blocks = 0;
770 struct ext_filesystem *fs = get_fs();
773 fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
774 fs->inodesz = INODE_SIZE_FILESYSTEM(ext4fs_root);
775 fs->sect_perblk = fs->blksz / SECTOR_SIZE;
777 /* get the superblock */
778 fs->sb = zalloc(SUPERBLOCK_SIZE);
781 if (!ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE,
786 if (ext4fs_init_journal())
789 /* get total no of blockgroups */
790 fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
791 (ext4fs_root->sblock.total_blocks -
792 ext4fs_root->sblock.first_data_block),
793 ext4fs_root->sblock.blocks_per_group);
795 /* get the block group descriptor table */
796 fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
797 if (ext4fs_get_bgdtable() == -1) {
798 printf("Error in getting the block group descriptor table\n");
801 fs->bgd = (struct ext2_block_group *)fs->gdtable;
803 /* load all the available bitmap block of the partition */
804 fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
807 for (i = 0; i < fs->no_blkgrp; i++) {
808 fs->blk_bmaps[i] = zalloc(fs->blksz);
809 if (!fs->blk_bmaps[i])
813 for (i = 0; i < fs->no_blkgrp; i++) {
815 ext4fs_devread(fs->bgd[i].block_id * fs->sect_perblk, 0,
816 fs->blksz, (char *)fs->blk_bmaps[i]);
821 /* load all the available inode bitmap of the partition */
822 fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
823 if (!fs->inode_bmaps)
825 for (i = 0; i < fs->no_blkgrp; i++) {
826 fs->inode_bmaps[i] = zalloc(fs->blksz);
827 if (!fs->inode_bmaps[i])
831 for (i = 0; i < fs->no_blkgrp; i++) {
832 status = ext4fs_devread(fs->bgd[i].inode_id * fs->sect_perblk,
834 (char *)fs->inode_bmaps[i]);
840 * check filesystem consistency with free blocks of file system
841 * some time we observed that superblock freeblocks does not match
842 * with the blockgroups freeblocks when improper
843 * reboot of a linux kernel
845 for (i = 0; i < fs->no_blkgrp; i++)
846 real_free_blocks = real_free_blocks + fs->bgd[i].free_blocks;
847 if (real_free_blocks != fs->sb->free_blocks)
848 fs->sb->free_blocks = real_free_blocks;
857 void ext4fs_deinit(void)
860 struct ext2_inode inode_journal;
861 struct journal_superblock_t *jsb;
863 struct ext_filesystem *fs = get_fs();
866 char *temp_buff = zalloc(fs->blksz);
868 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
870 blknr = read_allocated_block(&inode_journal,
871 EXT2_JOURNAL_SUPERBLOCK);
872 ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz,
874 jsb = (struct journal_superblock_t *)temp_buff;
875 jsb->s_start = cpu_to_be32(0);
876 put_ext4((uint64_t) (blknr * fs->blksz),
877 (struct journal_superblock_t *)temp_buff, fs->blksz);
880 ext4fs_free_journal();
882 /* get the superblock */
883 ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE, (char *)fs->sb);
884 fs->sb->feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
885 put_ext4((uint64_t)(SUPERBLOCK_SIZE),
886 (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
891 for (i = 0; i < fs->no_blkgrp; i++) {
892 free(fs->blk_bmaps[i]);
893 fs->blk_bmaps[i] = NULL;
896 fs->blk_bmaps = NULL;
899 if (fs->inode_bmaps) {
900 for (i = 0; i < fs->no_blkgrp; i++) {
901 free(fs->inode_bmaps[i]);
902 fs->inode_bmaps[i] = NULL;
904 free(fs->inode_bmaps);
905 fs->inode_bmaps = NULL;
913 * reinitiliazed the global inode and
914 * block bitmap first execution check variables
916 fs->first_pass_ibmap = 0;
917 fs->first_pass_bbmap = 0;
918 fs->curr_inode_no = 0;
922 static int ext4fs_write_file(struct ext2_inode *file_inode,
923 int pos, unsigned int len, char *buf)
927 int log2blocksize = LOG2_EXT2_BLOCK_SIZE(ext4fs_root);
928 unsigned int filesize = __le32_to_cpu(file_inode->size);
929 struct ext_filesystem *fs = get_fs();
930 int previous_block_number = -1;
931 int delayed_start = 0;
932 int delayed_extent = 0;
933 int delayed_skipfirst = 0;
934 int delayed_next = 0;
935 char *delayed_buf = NULL;
937 /* Adjust len so it we can't read past the end of the file. */
941 blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
943 for (i = pos / fs->blksz; i < blockcnt; i++) {
945 int blockend = fs->blksz;
947 blknr = read_allocated_block(file_inode, i);
951 blknr = blknr << log2blocksize;
954 if (previous_block_number != -1) {
955 if (delayed_next == blknr) {
956 delayed_extent += blockend;
957 delayed_next += blockend >> SECTOR_BITS;
959 put_ext4((uint64_t) (delayed_start *
962 (uint32_t) delayed_extent);
963 previous_block_number = blknr;
964 delayed_start = blknr;
965 delayed_extent = blockend;
966 delayed_skipfirst = skipfirst;
968 delayed_next = blknr +
969 (blockend >> SECTOR_BITS);
972 previous_block_number = blknr;
973 delayed_start = blknr;
974 delayed_extent = blockend;
975 delayed_skipfirst = skipfirst;
977 delayed_next = blknr +
978 (blockend >> SECTOR_BITS);
981 if (previous_block_number != -1) {
983 put_ext4((uint64_t) (delayed_start *
984 SECTOR_SIZE), delayed_buf,
985 (uint32_t) delayed_extent);
986 previous_block_number = -1;
988 memset(buf, 0, fs->blksz - skipfirst);
990 buf += fs->blksz - skipfirst;
992 if (previous_block_number != -1) {
994 put_ext4((uint64_t) (delayed_start * SECTOR_SIZE),
995 delayed_buf, (uint32_t) delayed_extent);
996 previous_block_number = -1;
1002 int ext4fs_write(const char *fname, unsigned char *buffer,
1003 unsigned long sizebytes)
1006 struct ext2_inode *file_inode = NULL;
1007 unsigned char *inode_buffer = NULL;
1010 time_t timestamp = 0;
1012 uint64_t bytes_reqd_for_file;
1013 unsigned int blks_reqd_for_file;
1014 unsigned int blocks_remaining;
1015 int existing_file_inodeno;
1018 char *temp_ptr = NULL;
1019 long int itable_blkno;
1020 long int parent_itable_blkno;
1022 struct ext2_sblock *sblock = &(ext4fs_root->sblock);
1023 unsigned int inodes_per_block;
1024 unsigned int ibmap_idx;
1025 struct ext_filesystem *fs = get_fs();
1026 g_parent_inode = zalloc(sizeof(struct ext2_inode));
1027 if (!g_parent_inode)
1030 if (ext4fs_init() != 0) {
1031 printf("error in File System init\n");
1034 inodes_per_block = fs->blksz / fs->inodesz;
1035 parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
1036 if (parent_inodeno == -1)
1038 if (ext4fs_iget(parent_inodeno, g_parent_inode))
1040 /* check if the filename is already present in root */
1041 existing_file_inodeno = ext4fs_filename_check(filename);
1042 if (existing_file_inodeno != -1) {
1043 ret = ext4fs_delete_file(existing_file_inodeno);
1044 fs->first_pass_bbmap = 0;
1047 fs->first_pass_ibmap = 0;
1048 fs->curr_inode_no = 0;
1052 /* calucalate how many blocks required */
1053 bytes_reqd_for_file = sizebytes;
1054 blks_reqd_for_file = bytes_reqd_for_file / fs->blksz;
1055 if (bytes_reqd_for_file % fs->blksz != 0) {
1056 blks_reqd_for_file++;
1057 debug("total bytes for a file %u\n", blks_reqd_for_file);
1059 blocks_remaining = blks_reqd_for_file;
1060 /* test for available space in partition */
1061 if (fs->sb->free_blocks < blks_reqd_for_file) {
1062 printf("Not enough space on partition !!!\n");
1066 ext4fs_update_parent_dentry(filename, &inodeno, FILETYPE_REG);
1067 /* prepare file inode */
1068 inode_buffer = zalloc(fs->inodesz);
1071 file_inode = (struct ext2_inode *)inode_buffer;
1072 file_inode->mode = S_IFREG | S_IRWXU |
1073 S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH;
1074 /* ToDo: Update correct time */
1075 file_inode->mtime = timestamp;
1076 file_inode->atime = timestamp;
1077 file_inode->ctime = timestamp;
1078 file_inode->nlinks = 1;
1079 file_inode->size = sizebytes;
1081 /* Allocate data blocks */
1082 ext4fs_allocate_blocks(file_inode, blocks_remaining,
1083 &blks_reqd_for_file);
1084 file_inode->blockcnt = (blks_reqd_for_file * fs->blksz) / SECTOR_SIZE;
1086 temp_ptr = zalloc(fs->blksz);
1089 ibmap_idx = inodeno / ext4fs_root->sblock.inodes_per_group;
1091 itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
1092 (inodeno % __le32_to_cpu(sblock->inodes_per_group)) /
1094 blkoff = (inodeno % inodes_per_block) * fs->inodesz;
1095 ext4fs_devread(itable_blkno * fs->sect_perblk, 0, fs->blksz, temp_ptr);
1096 if (ext4fs_log_journal(temp_ptr, itable_blkno))
1099 memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
1100 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
1102 /* copy the file content into data blocks */
1103 if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
1104 printf("Error in copying content\n");
1107 ibmap_idx = parent_inodeno / ext4fs_root->sblock.inodes_per_group;
1109 parent_itable_blkno = __le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
1111 __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1112 blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
1113 if (parent_itable_blkno != itable_blkno) {
1114 memset(temp_ptr, '\0', fs->blksz);
1115 ext4fs_devread(parent_itable_blkno * fs->sect_perblk,
1116 0, fs->blksz, temp_ptr);
1117 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
1120 memcpy(temp_ptr + blkoff, g_parent_inode,
1121 sizeof(struct ext2_inode));
1122 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
1127 * If parent and child fall in same inode table block
1128 * both should be kept in 1 buffer
1130 memcpy(temp_ptr + blkoff, g_parent_inode,
1131 sizeof(struct ext2_inode));
1133 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
1140 fs->first_pass_bbmap = 0;
1142 fs->first_pass_ibmap = 0;
1143 fs->curr_inode_no = 0;
1145 free(g_parent_inode);
1146 g_parent_inode = NULL;
1152 free(g_parent_inode);
1153 g_parent_inode = NULL;