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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
As noted by Coverity, when we have an error in alloc_triple_indirect_block we will leak ti_pbuff_start_addr as it's not being freed. Further inspection here shows that we could also leak ti_cbuff_start_addr in one corner case so free that as well. Reported-by: Coverity (CID 131205, 131206) Signed-off-by: Tom Rini <trini@konsulko.com>
2268 lines
56 KiB
C
2268 lines
56 KiB
C
/*
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* (C) Copyright 2011 - 2012 Samsung Electronics
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* EXT4 filesystem implementation in Uboot by
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* Uma Shankar <uma.shankar@samsung.com>
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* Manjunatha C Achar <a.manjunatha@samsung.com>
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*
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* ext4ls and ext4load : Based on ext2 ls load support in Uboot.
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*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code from grub2 fs/ext2.c and fs/fshelp.c by
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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* ext4write : Based on generic ext4 protocol.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <ext_common.h>
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#include <ext4fs.h>
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#include <inttypes.h>
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#include <malloc.h>
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#include <memalign.h>
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#include <stddef.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <asm/byteorder.h>
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#include "ext4_common.h"
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struct ext2_data *ext4fs_root;
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struct ext2fs_node *ext4fs_file;
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uint32_t *ext4fs_indir1_block;
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int ext4fs_indir1_size;
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int ext4fs_indir1_blkno = -1;
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uint32_t *ext4fs_indir2_block;
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int ext4fs_indir2_size;
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int ext4fs_indir2_blkno = -1;
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uint32_t *ext4fs_indir3_block;
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int ext4fs_indir3_size;
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int ext4fs_indir3_blkno = -1;
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struct ext2_inode *g_parent_inode;
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static int symlinknest;
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#if defined(CONFIG_EXT4_WRITE)
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uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
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{
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uint32_t res = size / n;
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if (res * n != size)
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res++;
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return res;
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}
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void put_ext4(uint64_t off, void *buf, uint32_t size)
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{
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uint64_t startblock;
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uint64_t remainder;
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unsigned char *temp_ptr = NULL;
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struct ext_filesystem *fs = get_fs();
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int log2blksz = fs->dev_desc->log2blksz;
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ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
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startblock = off >> log2blksz;
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startblock += part_offset;
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remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
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if (fs->dev_desc == NULL)
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return;
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if ((startblock + (size >> log2blksz)) >
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(part_offset + fs->total_sect)) {
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printf("part_offset is " LBAFU "\n", part_offset);
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printf("total_sector is %" PRIu64 "\n", fs->total_sect);
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printf("error: overflow occurs\n");
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return;
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}
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if (remainder) {
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if (fs->dev_desc->block_read) {
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fs->dev_desc->block_read(fs->dev_desc,
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startblock, 1, sec_buf);
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temp_ptr = sec_buf;
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memcpy((temp_ptr + remainder),
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(unsigned char *)buf, size);
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fs->dev_desc->block_write(fs->dev_desc,
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startblock, 1, sec_buf);
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}
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} else {
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if (size >> log2blksz != 0) {
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fs->dev_desc->block_write(fs->dev_desc,
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startblock,
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size >> log2blksz,
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(unsigned long *)buf);
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} else {
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fs->dev_desc->block_read(fs->dev_desc,
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startblock, 1, sec_buf);
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temp_ptr = sec_buf;
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memcpy(temp_ptr, buf, size);
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fs->dev_desc->block_write(fs->dev_desc,
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startblock, 1,
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(unsigned long *)sec_buf);
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}
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}
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}
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static int _get_new_inode_no(unsigned char *buffer)
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{
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struct ext_filesystem *fs = get_fs();
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unsigned char input;
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int operand, status;
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int count = 1;
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int j = 0;
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/* get the blocksize of the filesystem */
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unsigned char *ptr = buffer;
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while (*ptr == 255) {
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ptr++;
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count += 8;
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if (count > ext4fs_root->sblock.inodes_per_group)
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return -1;
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}
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for (j = 0; j < fs->blksz; j++) {
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input = *ptr;
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int i = 0;
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while (i <= 7) {
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operand = 1 << i;
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status = input & operand;
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if (status) {
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i++;
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count++;
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} else {
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*ptr |= operand;
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return count;
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}
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}
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ptr = ptr + 1;
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}
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return -1;
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}
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static int _get_new_blk_no(unsigned char *buffer)
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{
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unsigned char input;
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int operand, status;
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int count = 0;
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int j = 0;
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unsigned char *ptr = buffer;
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struct ext_filesystem *fs = get_fs();
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if (fs->blksz != 1024)
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count = 0;
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else
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count = 1;
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while (*ptr == 255) {
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ptr++;
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count += 8;
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if (count == (fs->blksz * 8))
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return -1;
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}
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for (j = 0; j < fs->blksz; j++) {
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input = *ptr;
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int i = 0;
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while (i <= 7) {
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operand = 1 << i;
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status = input & operand;
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if (status) {
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i++;
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count++;
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} else {
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*ptr |= operand;
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return count;
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}
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}
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ptr = ptr + 1;
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}
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return -1;
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}
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int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
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{
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int i, remainder, status;
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unsigned char *ptr = buffer;
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unsigned char operand;
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i = blockno / 8;
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remainder = blockno % 8;
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int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
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i = i - (index * blocksize);
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if (blocksize != 1024) {
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ptr = ptr + i;
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operand = 1 << remainder;
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status = *ptr & operand;
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if (status)
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return -1;
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*ptr = *ptr | operand;
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return 0;
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} else {
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if (remainder == 0) {
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ptr = ptr + i - 1;
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operand = (1 << 7);
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} else {
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ptr = ptr + i;
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operand = (1 << (remainder - 1));
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}
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status = *ptr & operand;
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if (status)
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return -1;
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*ptr = *ptr | operand;
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return 0;
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}
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}
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void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
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{
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int i, remainder, status;
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unsigned char *ptr = buffer;
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unsigned char operand;
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i = blockno / 8;
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remainder = blockno % 8;
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int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
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i = i - (index * blocksize);
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if (blocksize != 1024) {
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ptr = ptr + i;
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operand = (1 << remainder);
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status = *ptr & operand;
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if (status)
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*ptr = *ptr & ~(operand);
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} else {
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if (remainder == 0) {
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ptr = ptr + i - 1;
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operand = (1 << 7);
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} else {
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ptr = ptr + i;
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operand = (1 << (remainder - 1));
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}
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status = *ptr & operand;
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if (status)
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*ptr = *ptr & ~(operand);
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}
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}
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int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
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{
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int i, remainder, status;
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unsigned char *ptr = buffer;
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unsigned char operand;
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inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
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i = inode_no / 8;
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remainder = inode_no % 8;
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if (remainder == 0) {
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ptr = ptr + i - 1;
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operand = (1 << 7);
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} else {
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ptr = ptr + i;
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operand = (1 << (remainder - 1));
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}
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status = *ptr & operand;
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if (status)
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return -1;
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*ptr = *ptr | operand;
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return 0;
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}
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void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
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{
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int i, remainder, status;
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unsigned char *ptr = buffer;
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unsigned char operand;
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inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
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i = inode_no / 8;
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remainder = inode_no % 8;
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if (remainder == 0) {
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ptr = ptr + i - 1;
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operand = (1 << 7);
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} else {
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ptr = ptr + i;
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operand = (1 << (remainder - 1));
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}
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status = *ptr & operand;
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if (status)
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*ptr = *ptr & ~(operand);
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}
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int ext4fs_checksum_update(unsigned int i)
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{
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struct ext2_block_group *desc;
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struct ext_filesystem *fs = get_fs();
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__u16 crc = 0;
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desc = (struct ext2_block_group *)&fs->bgd[i];
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if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
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int offset = offsetof(struct ext2_block_group, bg_checksum);
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crc = ext2fs_crc16(~0, fs->sb->unique_id,
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sizeof(fs->sb->unique_id));
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crc = ext2fs_crc16(crc, &i, sizeof(i));
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crc = ext2fs_crc16(crc, desc, offset);
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offset += sizeof(desc->bg_checksum); /* skip checksum */
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assert(offset == sizeof(*desc));
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}
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return crc;
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}
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static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
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{
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int dentry_length;
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int sizeof_void_space;
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int new_entry_byte_reqd;
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short padding_factor = 0;
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if (dir->namelen % 4 != 0)
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padding_factor = 4 - (dir->namelen % 4);
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dentry_length = sizeof(struct ext2_dirent) +
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dir->namelen + padding_factor;
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sizeof_void_space = dir->direntlen - dentry_length;
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if (sizeof_void_space == 0)
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return 0;
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padding_factor = 0;
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if (strlen(filename) % 4 != 0)
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padding_factor = 4 - (strlen(filename) % 4);
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new_entry_byte_reqd = strlen(filename) +
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sizeof(struct ext2_dirent) + padding_factor;
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if (sizeof_void_space >= new_entry_byte_reqd) {
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dir->direntlen = dentry_length;
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return sizeof_void_space;
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}
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return 0;
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}
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void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
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{
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unsigned int *zero_buffer = NULL;
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char *root_first_block_buffer = NULL;
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int direct_blk_idx;
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long int root_blknr;
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long int first_block_no_of_root = 0;
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long int previous_blknr = -1;
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int totalbytes = 0;
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short int padding_factor = 0;
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unsigned int new_entry_byte_reqd;
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unsigned int last_entry_dirlen;
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int sizeof_void_space = 0;
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int templength = 0;
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int inodeno;
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int status;
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struct ext_filesystem *fs = get_fs();
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/* directory entry */
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struct ext2_dirent *dir;
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char *temp_dir = NULL;
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zero_buffer = zalloc(fs->blksz);
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if (!zero_buffer) {
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printf("No Memory\n");
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return;
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}
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root_first_block_buffer = zalloc(fs->blksz);
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if (!root_first_block_buffer) {
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free(zero_buffer);
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printf("No Memory\n");
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return;
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}
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restart:
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/* read the block no allocated to a file */
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for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
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direct_blk_idx++) {
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root_blknr = read_allocated_block(g_parent_inode,
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direct_blk_idx);
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if (root_blknr == 0) {
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first_block_no_of_root = previous_blknr;
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break;
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}
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previous_blknr = root_blknr;
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}
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status = ext4fs_devread((lbaint_t)first_block_no_of_root
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* fs->sect_perblk,
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0, fs->blksz, root_first_block_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
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goto fail;
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dir = (struct ext2_dirent *)root_first_block_buffer;
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totalbytes = 0;
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while (dir->direntlen > 0) {
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/*
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* blocksize-totalbytes because last directory length
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* i.e. dir->direntlen is free availble space in the
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* block that means it is a last entry of directory
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* entry
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*/
|
|
|
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/* traversing the each directory entry */
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if (fs->blksz - totalbytes == dir->direntlen) {
|
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if (strlen(filename) % 4 != 0)
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padding_factor = 4 - (strlen(filename) % 4);
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|
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new_entry_byte_reqd = strlen(filename) +
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sizeof(struct ext2_dirent) + padding_factor;
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padding_factor = 0;
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/*
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* update last directory entry length to its
|
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* length because we are creating new directory
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* entry
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*/
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if (dir->namelen % 4 != 0)
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padding_factor = 4 - (dir->namelen % 4);
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|
|
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last_entry_dirlen = dir->namelen +
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sizeof(struct ext2_dirent) + padding_factor;
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if ((fs->blksz - totalbytes - last_entry_dirlen) <
|
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new_entry_byte_reqd) {
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printf("1st Block Full:Allocate new block\n");
|
|
|
|
if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
|
|
printf("Directory exceeds limit\n");
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|
goto fail;
|
|
}
|
|
g_parent_inode->b.blocks.dir_blocks
|
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[direct_blk_idx] = ext4fs_get_new_blk_no();
|
|
if (g_parent_inode->b.blocks.dir_blocks
|
|
[direct_blk_idx] == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
put_ext4(((uint64_t)
|
|
((uint64_t)g_parent_inode->b.
|
|
blocks.dir_blocks[direct_blk_idx] *
|
|
(uint64_t)fs->blksz)), zero_buffer, fs->blksz);
|
|
g_parent_inode->size =
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|
g_parent_inode->size + fs->blksz;
|
|
g_parent_inode->blockcnt =
|
|
g_parent_inode->blockcnt + fs->sect_perblk;
|
|
if (ext4fs_put_metadata
|
|
(root_first_block_buffer,
|
|
first_block_no_of_root))
|
|
goto fail;
|
|
goto restart;
|
|
}
|
|
dir->direntlen = last_entry_dirlen;
|
|
break;
|
|
}
|
|
|
|
templength = dir->direntlen;
|
|
totalbytes = totalbytes + templength;
|
|
sizeof_void_space = check_void_in_dentry(dir, filename);
|
|
if (sizeof_void_space)
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|
break;
|
|
|
|
dir = (struct ext2_dirent *)((char *)dir + templength);
|
|
}
|
|
|
|
/* make a pointer ready for creating next directory entry */
|
|
templength = dir->direntlen;
|
|
totalbytes = totalbytes + templength;
|
|
dir = (struct ext2_dirent *)((char *)dir + templength);
|
|
|
|
/* get the next available inode number */
|
|
inodeno = ext4fs_get_new_inode_no();
|
|
if (inodeno == -1) {
|
|
printf("no inode left to assign\n");
|
|
goto fail;
|
|
}
|
|
dir->inode = inodeno;
|
|
if (sizeof_void_space)
|
|
dir->direntlen = sizeof_void_space;
|
|
else
|
|
dir->direntlen = fs->blksz - totalbytes;
|
|
|
|
dir->namelen = strlen(filename);
|
|
dir->filetype = FILETYPE_REG; /* regular file */
|
|
temp_dir = (char *)dir;
|
|
temp_dir = temp_dir + sizeof(struct ext2_dirent);
|
|
memcpy(temp_dir, filename, strlen(filename));
|
|
|
|
*p_ino = inodeno;
|
|
|
|
/* update or write the 1st block of root inode */
|
|
if (ext4fs_put_metadata(root_first_block_buffer,
|
|
first_block_no_of_root))
|
|
goto fail;
|
|
|
|
fail:
|
|
free(zero_buffer);
|
|
free(root_first_block_buffer);
|
|
}
|
|
|
|
static int search_dir(struct ext2_inode *parent_inode, char *dirname)
|
|
{
|
|
int status;
|
|
int inodeno;
|
|
int totalbytes;
|
|
int templength;
|
|
int direct_blk_idx;
|
|
long int blknr;
|
|
int found = 0;
|
|
char *ptr = NULL;
|
|
unsigned char *block_buffer = NULL;
|
|
struct ext2_dirent *dir = NULL;
|
|
struct ext2_dirent *previous_dir = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
|
|
/* read the block no allocated to a file */
|
|
for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
|
|
direct_blk_idx++) {
|
|
blknr = read_allocated_block(parent_inode, direct_blk_idx);
|
|
if (blknr == 0)
|
|
goto fail;
|
|
|
|
/* read the blocks of parenet inode */
|
|
block_buffer = zalloc(fs->blksz);
|
|
if (!block_buffer)
|
|
goto fail;
|
|
|
|
status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
|
|
0, fs->blksz, (char *)block_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
dir = (struct ext2_dirent *)block_buffer;
|
|
ptr = (char *)dir;
|
|
totalbytes = 0;
|
|
while (dir->direntlen >= 0) {
|
|
/*
|
|
* blocksize-totalbytes because last directory
|
|
* length i.e.,*dir->direntlen is free availble
|
|
* space in the block that means
|
|
* it is a last entry of directory entry
|
|
*/
|
|
if (strlen(dirname) == dir->namelen) {
|
|
if (strncmp(dirname, ptr +
|
|
sizeof(struct ext2_dirent),
|
|
dir->namelen) == 0) {
|
|
previous_dir->direntlen +=
|
|
dir->direntlen;
|
|
inodeno = dir->inode;
|
|
dir->inode = 0;
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fs->blksz - totalbytes == dir->direntlen)
|
|
break;
|
|
|
|
/* traversing the each directory entry */
|
|
templength = dir->direntlen;
|
|
totalbytes = totalbytes + templength;
|
|
previous_dir = dir;
|
|
dir = (struct ext2_dirent *)((char *)dir + templength);
|
|
ptr = (char *)dir;
|
|
}
|
|
|
|
if (found == 1) {
|
|
free(block_buffer);
|
|
block_buffer = NULL;
|
|
return inodeno;
|
|
}
|
|
|
|
free(block_buffer);
|
|
block_buffer = NULL;
|
|
}
|
|
|
|
fail:
|
|
free(block_buffer);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int find_dir_depth(char *dirname)
|
|
{
|
|
char *token = strtok(dirname, "/");
|
|
int count = 0;
|
|
while (token != NULL) {
|
|
token = strtok(NULL, "/");
|
|
count++;
|
|
}
|
|
return count + 1 + 1;
|
|
/*
|
|
* for example for string /home/temp
|
|
* depth=home(1)+temp(1)+1 extra for NULL;
|
|
* so count is 4;
|
|
*/
|
|
}
|
|
|
|
static int parse_path(char **arr, char *dirname)
|
|
{
|
|
char *token = strtok(dirname, "/");
|
|
int i = 0;
|
|
|
|
/* add root */
|
|
arr[i] = zalloc(strlen("/") + 1);
|
|
if (!arr[i])
|
|
return -ENOMEM;
|
|
memcpy(arr[i++], "/", strlen("/"));
|
|
|
|
/* add each path entry after root */
|
|
while (token != NULL) {
|
|
arr[i] = zalloc(strlen(token) + 1);
|
|
if (!arr[i])
|
|
return -ENOMEM;
|
|
memcpy(arr[i++], token, strlen(token));
|
|
token = strtok(NULL, "/");
|
|
}
|
|
arr[i] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ext4fs_iget(int inode_no, struct ext2_inode *inode)
|
|
{
|
|
if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function: ext4fs_get_parent_inode_num
|
|
* Return Value: inode Number of the parent directory of file/Directory to be
|
|
* created
|
|
* dirname : Input parmater, input path name of the file/directory to be created
|
|
* dname : Output parameter, to be filled with the name of the directory
|
|
* extracted from dirname
|
|
*/
|
|
int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
|
|
{
|
|
int i;
|
|
int depth = 0;
|
|
int matched_inode_no;
|
|
int result_inode_no = -1;
|
|
char **ptr = NULL;
|
|
char *depth_dirname = NULL;
|
|
char *parse_dirname = NULL;
|
|
struct ext2_inode *parent_inode = NULL;
|
|
struct ext2_inode *first_inode = NULL;
|
|
struct ext2_inode temp_inode;
|
|
|
|
if (*dirname != '/') {
|
|
printf("Please supply Absolute path\n");
|
|
return -1;
|
|
}
|
|
|
|
/* TODO: input validation make equivalent to linux */
|
|
depth_dirname = zalloc(strlen(dirname) + 1);
|
|
if (!depth_dirname)
|
|
return -ENOMEM;
|
|
|
|
memcpy(depth_dirname, dirname, strlen(dirname));
|
|
depth = find_dir_depth(depth_dirname);
|
|
parse_dirname = zalloc(strlen(dirname) + 1);
|
|
if (!parse_dirname)
|
|
goto fail;
|
|
memcpy(parse_dirname, dirname, strlen(dirname));
|
|
|
|
/* allocate memory for each directory level */
|
|
ptr = zalloc((depth) * sizeof(char *));
|
|
if (!ptr)
|
|
goto fail;
|
|
if (parse_path(ptr, parse_dirname))
|
|
goto fail;
|
|
parent_inode = zalloc(sizeof(struct ext2_inode));
|
|
if (!parent_inode)
|
|
goto fail;
|
|
first_inode = zalloc(sizeof(struct ext2_inode));
|
|
if (!first_inode)
|
|
goto fail;
|
|
memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
|
|
memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
|
|
if (flags & F_FILE)
|
|
result_inode_no = EXT2_ROOT_INO;
|
|
for (i = 1; i < depth; i++) {
|
|
matched_inode_no = search_dir(parent_inode, ptr[i]);
|
|
if (matched_inode_no == -1) {
|
|
if (ptr[i + 1] == NULL && i == 1) {
|
|
result_inode_no = EXT2_ROOT_INO;
|
|
goto end;
|
|
} else {
|
|
if (ptr[i + 1] == NULL)
|
|
break;
|
|
printf("Invalid path\n");
|
|
result_inode_no = -1;
|
|
goto fail;
|
|
}
|
|
} else {
|
|
if (ptr[i + 1] != NULL) {
|
|
memset(parent_inode, '\0',
|
|
sizeof(struct ext2_inode));
|
|
if (ext4fs_iget(matched_inode_no,
|
|
parent_inode)) {
|
|
result_inode_no = -1;
|
|
goto fail;
|
|
}
|
|
result_inode_no = matched_inode_no;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
end:
|
|
if (i == 1)
|
|
matched_inode_no = search_dir(first_inode, ptr[i]);
|
|
else
|
|
matched_inode_no = search_dir(parent_inode, ptr[i]);
|
|
|
|
if (matched_inode_no != -1) {
|
|
ext4fs_iget(matched_inode_no, &temp_inode);
|
|
if (temp_inode.mode & S_IFDIR) {
|
|
printf("It is a Directory\n");
|
|
result_inode_no = -1;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (strlen(ptr[i]) > 256) {
|
|
result_inode_no = -1;
|
|
goto fail;
|
|
}
|
|
memcpy(dname, ptr[i], strlen(ptr[i]));
|
|
|
|
fail:
|
|
free(depth_dirname);
|
|
free(parse_dirname);
|
|
for (i = 0; i < depth; i++) {
|
|
if (!ptr[i])
|
|
break;
|
|
free(ptr[i]);
|
|
}
|
|
free(ptr);
|
|
free(parent_inode);
|
|
free(first_inode);
|
|
|
|
return result_inode_no;
|
|
}
|
|
|
|
static int check_filename(char *filename, unsigned int blknr)
|
|
{
|
|
unsigned int first_block_no_of_root;
|
|
int totalbytes = 0;
|
|
int templength = 0;
|
|
int status, inodeno;
|
|
int found = 0;
|
|
char *root_first_block_buffer = NULL;
|
|
char *root_first_block_addr = NULL;
|
|
struct ext2_dirent *dir = NULL;
|
|
struct ext2_dirent *previous_dir = NULL;
|
|
char *ptr = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
int ret = -1;
|
|
|
|
/* get the first block of root */
|
|
first_block_no_of_root = blknr;
|
|
root_first_block_buffer = zalloc(fs->blksz);
|
|
if (!root_first_block_buffer)
|
|
return -ENOMEM;
|
|
root_first_block_addr = root_first_block_buffer;
|
|
status = ext4fs_devread((lbaint_t)first_block_no_of_root *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz, root_first_block_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
|
|
goto fail;
|
|
dir = (struct ext2_dirent *)root_first_block_buffer;
|
|
ptr = (char *)dir;
|
|
totalbytes = 0;
|
|
while (dir->direntlen >= 0) {
|
|
/*
|
|
* blocksize-totalbytes because last
|
|
* directory length i.e., *dir->direntlen
|
|
* is free availble space in the block that
|
|
* means it is a last entry of directory entry
|
|
*/
|
|
if (strlen(filename) == dir->namelen) {
|
|
if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
|
|
dir->namelen) == 0) {
|
|
printf("file found deleting\n");
|
|
previous_dir->direntlen += dir->direntlen;
|
|
inodeno = dir->inode;
|
|
dir->inode = 0;
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fs->blksz - totalbytes == dir->direntlen)
|
|
break;
|
|
|
|
/* traversing the each directory entry */
|
|
templength = dir->direntlen;
|
|
totalbytes = totalbytes + templength;
|
|
previous_dir = dir;
|
|
dir = (struct ext2_dirent *)((char *)dir + templength);
|
|
ptr = (char *)dir;
|
|
}
|
|
|
|
|
|
if (found == 1) {
|
|
if (ext4fs_put_metadata(root_first_block_addr,
|
|
first_block_no_of_root))
|
|
goto fail;
|
|
ret = inodeno;
|
|
}
|
|
fail:
|
|
free(root_first_block_buffer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ext4fs_filename_check(char *filename)
|
|
{
|
|
short direct_blk_idx = 0;
|
|
long int blknr = -1;
|
|
int inodeno = -1;
|
|
|
|
/* read the block no allocated to a file */
|
|
for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
|
|
direct_blk_idx++) {
|
|
blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
|
|
if (blknr == 0)
|
|
break;
|
|
inodeno = check_filename(filename, blknr);
|
|
if (inodeno != -1)
|
|
return inodeno;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
long int ext4fs_get_new_blk_no(void)
|
|
{
|
|
short i;
|
|
short status;
|
|
int remainder;
|
|
unsigned int bg_idx;
|
|
static int prev_bg_bitmap_index = -1;
|
|
unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
|
|
struct ext_filesystem *fs = get_fs();
|
|
char *journal_buffer = zalloc(fs->blksz);
|
|
char *zero_buffer = zalloc(fs->blksz);
|
|
if (!journal_buffer || !zero_buffer)
|
|
goto fail;
|
|
struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
|
|
|
|
if (fs->first_pass_bbmap == 0) {
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
if (bgd[i].free_blocks) {
|
|
if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
|
|
put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
|
|
(uint64_t)fs->blksz)),
|
|
zero_buffer, fs->blksz);
|
|
bgd[i].bg_flags =
|
|
bgd[i].
|
|
bg_flags & ~EXT4_BG_BLOCK_UNINIT;
|
|
memcpy(fs->blk_bmaps[i], zero_buffer,
|
|
fs->blksz);
|
|
}
|
|
fs->curr_blkno =
|
|
_get_new_blk_no(fs->blk_bmaps[i]);
|
|
if (fs->curr_blkno == -1)
|
|
/* if block bitmap is completely fill */
|
|
continue;
|
|
fs->curr_blkno = fs->curr_blkno +
|
|
(i * fs->blksz * 8);
|
|
fs->first_pass_bbmap++;
|
|
bgd[i].free_blocks--;
|
|
fs->sb->free_blocks--;
|
|
status = ext4fs_devread((lbaint_t)
|
|
bgd[i].block_id *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz,
|
|
journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer,
|
|
bgd[i].block_id))
|
|
goto fail;
|
|
goto success;
|
|
} else {
|
|
debug("no space left on block group %d\n", i);
|
|
}
|
|
}
|
|
|
|
goto fail;
|
|
} else {
|
|
restart:
|
|
fs->curr_blkno++;
|
|
/* get the blockbitmap index respective to blockno */
|
|
bg_idx = fs->curr_blkno / blk_per_grp;
|
|
if (fs->blksz == 1024) {
|
|
remainder = fs->curr_blkno % blk_per_grp;
|
|
if (!remainder)
|
|
bg_idx--;
|
|
}
|
|
|
|
/*
|
|
* To skip completely filled block group bitmaps
|
|
* Optimize the block allocation
|
|
*/
|
|
if (bg_idx >= fs->no_blkgrp)
|
|
goto fail;
|
|
|
|
if (bgd[bg_idx].free_blocks == 0) {
|
|
debug("block group %u is full. Skipping\n", bg_idx);
|
|
fs->curr_blkno = fs->curr_blkno + blk_per_grp;
|
|
fs->curr_blkno--;
|
|
goto restart;
|
|
}
|
|
|
|
if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
|
|
memset(zero_buffer, '\0', fs->blksz);
|
|
put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
|
|
(uint64_t)fs->blksz)), zero_buffer, fs->blksz);
|
|
memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
|
|
bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
|
|
~EXT4_BG_BLOCK_UNINIT;
|
|
}
|
|
|
|
if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
|
|
bg_idx) != 0) {
|
|
debug("going for restart for the block no %ld %u\n",
|
|
fs->curr_blkno, bg_idx);
|
|
goto restart;
|
|
}
|
|
|
|
/* journal backup */
|
|
if (prev_bg_bitmap_index != bg_idx) {
|
|
memset(journal_buffer, '\0', fs->blksz);
|
|
status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
|
|
* fs->sect_perblk,
|
|
0, fs->blksz, journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer,
|
|
bgd[bg_idx].block_id))
|
|
goto fail;
|
|
|
|
prev_bg_bitmap_index = bg_idx;
|
|
}
|
|
bgd[bg_idx].free_blocks--;
|
|
fs->sb->free_blocks--;
|
|
goto success;
|
|
}
|
|
success:
|
|
free(journal_buffer);
|
|
free(zero_buffer);
|
|
|
|
return fs->curr_blkno;
|
|
fail:
|
|
free(journal_buffer);
|
|
free(zero_buffer);
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ext4fs_get_new_inode_no(void)
|
|
{
|
|
short i;
|
|
short status;
|
|
unsigned int ibmap_idx;
|
|
static int prev_inode_bitmap_index = -1;
|
|
unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
|
|
struct ext_filesystem *fs = get_fs();
|
|
char *journal_buffer = zalloc(fs->blksz);
|
|
char *zero_buffer = zalloc(fs->blksz);
|
|
if (!journal_buffer || !zero_buffer)
|
|
goto fail;
|
|
struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
|
|
|
|
if (fs->first_pass_ibmap == 0) {
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
if (bgd[i].free_inodes) {
|
|
if (bgd[i].bg_itable_unused !=
|
|
bgd[i].free_inodes)
|
|
bgd[i].bg_itable_unused =
|
|
bgd[i].free_inodes;
|
|
if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
|
|
put_ext4(((uint64_t)
|
|
((uint64_t)bgd[i].inode_id *
|
|
(uint64_t)fs->blksz)),
|
|
zero_buffer, fs->blksz);
|
|
bgd[i].bg_flags = bgd[i].bg_flags &
|
|
~EXT4_BG_INODE_UNINIT;
|
|
memcpy(fs->inode_bmaps[i],
|
|
zero_buffer, fs->blksz);
|
|
}
|
|
fs->curr_inode_no =
|
|
_get_new_inode_no(fs->inode_bmaps[i]);
|
|
if (fs->curr_inode_no == -1)
|
|
/* if block bitmap is completely fill */
|
|
continue;
|
|
fs->curr_inode_no = fs->curr_inode_no +
|
|
(i * inodes_per_grp);
|
|
fs->first_pass_ibmap++;
|
|
bgd[i].free_inodes--;
|
|
bgd[i].bg_itable_unused--;
|
|
fs->sb->free_inodes--;
|
|
status = ext4fs_devread((lbaint_t)
|
|
bgd[i].inode_id *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz,
|
|
journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer,
|
|
bgd[i].inode_id))
|
|
goto fail;
|
|
goto success;
|
|
} else
|
|
debug("no inode left on block group %d\n", i);
|
|
}
|
|
goto fail;
|
|
} else {
|
|
restart:
|
|
fs->curr_inode_no++;
|
|
/* get the blockbitmap index respective to blockno */
|
|
ibmap_idx = fs->curr_inode_no / inodes_per_grp;
|
|
if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
|
|
memset(zero_buffer, '\0', fs->blksz);
|
|
put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
|
|
(uint64_t)fs->blksz)), zero_buffer,
|
|
fs->blksz);
|
|
bgd[ibmap_idx].bg_flags =
|
|
bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
|
|
memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
|
|
fs->blksz);
|
|
}
|
|
|
|
if (ext4fs_set_inode_bmap(fs->curr_inode_no,
|
|
fs->inode_bmaps[ibmap_idx],
|
|
ibmap_idx) != 0) {
|
|
debug("going for restart for the block no %d %u\n",
|
|
fs->curr_inode_no, ibmap_idx);
|
|
goto restart;
|
|
}
|
|
|
|
/* journal backup */
|
|
if (prev_inode_bitmap_index != ibmap_idx) {
|
|
memset(journal_buffer, '\0', fs->blksz);
|
|
status = ext4fs_devread((lbaint_t)
|
|
bgd[ibmap_idx].inode_id
|
|
* fs->sect_perblk,
|
|
0, fs->blksz, journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer,
|
|
bgd[ibmap_idx].inode_id))
|
|
goto fail;
|
|
prev_inode_bitmap_index = ibmap_idx;
|
|
}
|
|
if (bgd[ibmap_idx].bg_itable_unused !=
|
|
bgd[ibmap_idx].free_inodes)
|
|
bgd[ibmap_idx].bg_itable_unused =
|
|
bgd[ibmap_idx].free_inodes;
|
|
bgd[ibmap_idx].free_inodes--;
|
|
bgd[ibmap_idx].bg_itable_unused--;
|
|
fs->sb->free_inodes--;
|
|
goto success;
|
|
}
|
|
|
|
success:
|
|
free(journal_buffer);
|
|
free(zero_buffer);
|
|
|
|
return fs->curr_inode_no;
|
|
fail:
|
|
free(journal_buffer);
|
|
free(zero_buffer);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
static void alloc_single_indirect_block(struct ext2_inode *file_inode,
|
|
unsigned int *total_remaining_blocks,
|
|
unsigned int *no_blks_reqd)
|
|
{
|
|
short i;
|
|
short status;
|
|
long int actual_block_no;
|
|
long int si_blockno;
|
|
/* si :single indirect */
|
|
unsigned int *si_buffer = NULL;
|
|
unsigned int *si_start_addr = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
|
|
if (*total_remaining_blocks != 0) {
|
|
si_buffer = zalloc(fs->blksz);
|
|
if (!si_buffer) {
|
|
printf("No Memory\n");
|
|
return;
|
|
}
|
|
si_start_addr = si_buffer;
|
|
si_blockno = ext4fs_get_new_blk_no();
|
|
if (si_blockno == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
(*no_blks_reqd)++;
|
|
debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
|
|
|
|
status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
|
|
0, fs->blksz, (char *)si_buffer);
|
|
memset(si_buffer, '\0', fs->blksz);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
|
|
actual_block_no = ext4fs_get_new_blk_no();
|
|
if (actual_block_no == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
*si_buffer = actual_block_no;
|
|
debug("SIAB %u: %u\n", *si_buffer,
|
|
*total_remaining_blocks);
|
|
|
|
si_buffer++;
|
|
(*total_remaining_blocks)--;
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
|
|
/* write the block to disk */
|
|
put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
|
|
si_start_addr, fs->blksz);
|
|
file_inode->b.blocks.indir_block = si_blockno;
|
|
}
|
|
fail:
|
|
free(si_start_addr);
|
|
}
|
|
|
|
static void alloc_double_indirect_block(struct ext2_inode *file_inode,
|
|
unsigned int *total_remaining_blocks,
|
|
unsigned int *no_blks_reqd)
|
|
{
|
|
short i;
|
|
short j;
|
|
short status;
|
|
long int actual_block_no;
|
|
/* di:double indirect */
|
|
long int di_blockno_parent;
|
|
long int di_blockno_child;
|
|
unsigned int *di_parent_buffer = NULL;
|
|
unsigned int *di_child_buff = NULL;
|
|
unsigned int *di_block_start_addr = NULL;
|
|
unsigned int *di_child_buff_start = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
|
|
if (*total_remaining_blocks != 0) {
|
|
/* double indirect parent block connecting to inode */
|
|
di_blockno_parent = ext4fs_get_new_blk_no();
|
|
if (di_blockno_parent == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
di_parent_buffer = zalloc(fs->blksz);
|
|
if (!di_parent_buffer)
|
|
goto fail;
|
|
|
|
di_block_start_addr = di_parent_buffer;
|
|
(*no_blks_reqd)++;
|
|
debug("DIPB %ld: %u\n", di_blockno_parent,
|
|
*total_remaining_blocks);
|
|
|
|
status = ext4fs_devread((lbaint_t)di_blockno_parent *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz, (char *)di_parent_buffer);
|
|
|
|
if (!status) {
|
|
printf("%s: Device read error!\n", __func__);
|
|
goto fail;
|
|
}
|
|
memset(di_parent_buffer, '\0', fs->blksz);
|
|
|
|
/*
|
|
* start:for each double indirect parent
|
|
* block create one more block
|
|
*/
|
|
for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
|
|
di_blockno_child = ext4fs_get_new_blk_no();
|
|
if (di_blockno_child == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
di_child_buff = zalloc(fs->blksz);
|
|
if (!di_child_buff)
|
|
goto fail;
|
|
|
|
di_child_buff_start = di_child_buff;
|
|
*di_parent_buffer = di_blockno_child;
|
|
di_parent_buffer++;
|
|
(*no_blks_reqd)++;
|
|
debug("DICB %ld: %u\n", di_blockno_child,
|
|
*total_remaining_blocks);
|
|
|
|
status = ext4fs_devread((lbaint_t)di_blockno_child *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz,
|
|
(char *)di_child_buff);
|
|
|
|
if (!status) {
|
|
printf("%s: Device read error!\n", __func__);
|
|
goto fail;
|
|
}
|
|
memset(di_child_buff, '\0', fs->blksz);
|
|
/* filling of actual datablocks for each child */
|
|
for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
|
|
actual_block_no = ext4fs_get_new_blk_no();
|
|
if (actual_block_no == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
*di_child_buff = actual_block_no;
|
|
debug("DIAB %ld: %u\n", actual_block_no,
|
|
*total_remaining_blocks);
|
|
|
|
di_child_buff++;
|
|
(*total_remaining_blocks)--;
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
/* write the block table */
|
|
put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
|
|
di_child_buff_start, fs->blksz);
|
|
free(di_child_buff_start);
|
|
di_child_buff_start = NULL;
|
|
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
|
|
di_block_start_addr, fs->blksz);
|
|
file_inode->b.blocks.double_indir_block = di_blockno_parent;
|
|
}
|
|
fail:
|
|
free(di_block_start_addr);
|
|
}
|
|
|
|
static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
|
|
unsigned int *total_remaining_blocks,
|
|
unsigned int *no_blks_reqd)
|
|
{
|
|
short i;
|
|
short j;
|
|
short k;
|
|
long int actual_block_no;
|
|
/* ti: Triple Indirect */
|
|
long int ti_gp_blockno;
|
|
long int ti_parent_blockno;
|
|
long int ti_child_blockno;
|
|
unsigned int *ti_gp_buff = NULL;
|
|
unsigned int *ti_parent_buff = NULL;
|
|
unsigned int *ti_child_buff = NULL;
|
|
unsigned int *ti_gp_buff_start_addr = NULL;
|
|
unsigned int *ti_pbuff_start_addr = NULL;
|
|
unsigned int *ti_cbuff_start_addr = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
if (*total_remaining_blocks != 0) {
|
|
/* triple indirect grand parent block connecting to inode */
|
|
ti_gp_blockno = ext4fs_get_new_blk_no();
|
|
if (ti_gp_blockno == -1) {
|
|
printf("no block left to assign\n");
|
|
return;
|
|
}
|
|
ti_gp_buff = zalloc(fs->blksz);
|
|
if (!ti_gp_buff)
|
|
return;
|
|
|
|
ti_gp_buff_start_addr = ti_gp_buff;
|
|
(*no_blks_reqd)++;
|
|
debug("TIGPB %ld: %u\n", ti_gp_blockno,
|
|
*total_remaining_blocks);
|
|
|
|
/* for each 4 byte grand parent entry create one more block */
|
|
for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
|
|
ti_parent_blockno = ext4fs_get_new_blk_no();
|
|
if (ti_parent_blockno == -1) {
|
|
printf("no block left to assign\n");
|
|
goto fail;
|
|
}
|
|
ti_parent_buff = zalloc(fs->blksz);
|
|
if (!ti_parent_buff)
|
|
goto fail;
|
|
|
|
ti_pbuff_start_addr = ti_parent_buff;
|
|
*ti_gp_buff = ti_parent_blockno;
|
|
ti_gp_buff++;
|
|
(*no_blks_reqd)++;
|
|
debug("TIPB %ld: %u\n", ti_parent_blockno,
|
|
*total_remaining_blocks);
|
|
|
|
/* for each 4 byte entry parent create one more block */
|
|
for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
|
|
ti_child_blockno = ext4fs_get_new_blk_no();
|
|
if (ti_child_blockno == -1) {
|
|
printf("no block left assign\n");
|
|
goto fail1;
|
|
}
|
|
ti_child_buff = zalloc(fs->blksz);
|
|
if (!ti_child_buff)
|
|
goto fail1;
|
|
|
|
ti_cbuff_start_addr = ti_child_buff;
|
|
*ti_parent_buff = ti_child_blockno;
|
|
ti_parent_buff++;
|
|
(*no_blks_reqd)++;
|
|
debug("TICB %ld: %u\n", ti_parent_blockno,
|
|
*total_remaining_blocks);
|
|
|
|
/* fill actual datablocks for each child */
|
|
for (k = 0; k < (fs->blksz / sizeof(int));
|
|
k++) {
|
|
actual_block_no =
|
|
ext4fs_get_new_blk_no();
|
|
if (actual_block_no == -1) {
|
|
printf("no block left\n");
|
|
free(ti_cbuff_start_addr);
|
|
goto fail1;
|
|
}
|
|
*ti_child_buff = actual_block_no;
|
|
debug("TIAB %ld: %u\n", actual_block_no,
|
|
*total_remaining_blocks);
|
|
|
|
ti_child_buff++;
|
|
(*total_remaining_blocks)--;
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
/* write the child block */
|
|
put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
|
|
(uint64_t)fs->blksz)),
|
|
ti_cbuff_start_addr, fs->blksz);
|
|
free(ti_cbuff_start_addr);
|
|
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
/* write the parent block */
|
|
put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
|
|
ti_pbuff_start_addr, fs->blksz);
|
|
free(ti_pbuff_start_addr);
|
|
|
|
if (*total_remaining_blocks == 0)
|
|
break;
|
|
}
|
|
/* write the grand parent block */
|
|
put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
|
|
ti_gp_buff_start_addr, fs->blksz);
|
|
file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
|
|
free(ti_gp_buff_start_addr);
|
|
return;
|
|
}
|
|
fail1:
|
|
free(ti_pbuff_start_addr);
|
|
fail:
|
|
free(ti_gp_buff_start_addr);
|
|
}
|
|
|
|
void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
|
|
unsigned int total_remaining_blocks,
|
|
unsigned int *total_no_of_block)
|
|
{
|
|
short i;
|
|
long int direct_blockno;
|
|
unsigned int no_blks_reqd = 0;
|
|
|
|
/* allocation of direct blocks */
|
|
for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
|
|
direct_blockno = ext4fs_get_new_blk_no();
|
|
if (direct_blockno == -1) {
|
|
printf("no block left to assign\n");
|
|
return;
|
|
}
|
|
file_inode->b.blocks.dir_blocks[i] = direct_blockno;
|
|
debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
|
|
|
|
total_remaining_blocks--;
|
|
}
|
|
|
|
alloc_single_indirect_block(file_inode, &total_remaining_blocks,
|
|
&no_blks_reqd);
|
|
alloc_double_indirect_block(file_inode, &total_remaining_blocks,
|
|
&no_blks_reqd);
|
|
alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
|
|
&no_blks_reqd);
|
|
*total_no_of_block += no_blks_reqd;
|
|
}
|
|
|
|
#endif
|
|
|
|
static struct ext4_extent_header *ext4fs_get_extent_block
|
|
(struct ext2_data *data, char *buf,
|
|
struct ext4_extent_header *ext_block,
|
|
uint32_t fileblock, int log2_blksz)
|
|
{
|
|
struct ext4_extent_idx *index;
|
|
unsigned long long block;
|
|
int blksz = EXT2_BLOCK_SIZE(data);
|
|
int i;
|
|
|
|
while (1) {
|
|
index = (struct ext4_extent_idx *)(ext_block + 1);
|
|
|
|
if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
|
|
return 0;
|
|
|
|
if (ext_block->eh_depth == 0)
|
|
return ext_block;
|
|
i = -1;
|
|
do {
|
|
i++;
|
|
if (i >= le16_to_cpu(ext_block->eh_entries))
|
|
break;
|
|
} while (fileblock >= le32_to_cpu(index[i].ei_block));
|
|
|
|
if (--i < 0)
|
|
return 0;
|
|
|
|
block = le16_to_cpu(index[i].ei_leaf_hi);
|
|
block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
|
|
|
|
if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
|
|
buf))
|
|
ext_block = (struct ext4_extent_header *)buf;
|
|
else
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int ext4fs_blockgroup
|
|
(struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
|
|
{
|
|
long int blkno;
|
|
unsigned int blkoff, desc_per_blk;
|
|
int log2blksz = get_fs()->dev_desc->log2blksz;
|
|
|
|
desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
|
|
|
|
blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
|
|
group / desc_per_blk;
|
|
blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
|
|
|
|
debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
|
|
group, blkno, blkoff);
|
|
|
|
return ext4fs_devread((lbaint_t)blkno <<
|
|
(LOG2_BLOCK_SIZE(data) - log2blksz),
|
|
blkoff, sizeof(struct ext2_block_group),
|
|
(char *)blkgrp);
|
|
}
|
|
|
|
int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
|
|
{
|
|
struct ext2_block_group blkgrp;
|
|
struct ext2_sblock *sblock = &data->sblock;
|
|
struct ext_filesystem *fs = get_fs();
|
|
int log2blksz = get_fs()->dev_desc->log2blksz;
|
|
int inodes_per_block, status;
|
|
long int blkno;
|
|
unsigned int blkoff;
|
|
|
|
/* It is easier to calculate if the first inode is 0. */
|
|
ino--;
|
|
status = ext4fs_blockgroup(data, ino / __le32_to_cpu
|
|
(sblock->inodes_per_group), &blkgrp);
|
|
if (status == 0)
|
|
return 0;
|
|
|
|
inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
|
|
blkno = __le32_to_cpu(blkgrp.inode_table_id) +
|
|
(ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
|
|
blkoff = (ino % inodes_per_block) * fs->inodesz;
|
|
/* Read the inode. */
|
|
status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
|
|
log2blksz), blkoff,
|
|
sizeof(struct ext2_inode), (char *)inode);
|
|
if (status == 0)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
long int read_allocated_block(struct ext2_inode *inode, int fileblock)
|
|
{
|
|
long int blknr;
|
|
int blksz;
|
|
int log2_blksz;
|
|
int status;
|
|
long int rblock;
|
|
long int perblock_parent;
|
|
long int perblock_child;
|
|
unsigned long long start;
|
|
/* get the blocksize of the filesystem */
|
|
blksz = EXT2_BLOCK_SIZE(ext4fs_root);
|
|
log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
|
|
- get_fs()->dev_desc->log2blksz;
|
|
|
|
if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
|
|
char *buf = zalloc(blksz);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
struct ext4_extent_header *ext_block;
|
|
struct ext4_extent *extent;
|
|
int i = -1;
|
|
ext_block =
|
|
ext4fs_get_extent_block(ext4fs_root, buf,
|
|
(struct ext4_extent_header *)
|
|
inode->b.blocks.dir_blocks,
|
|
fileblock, log2_blksz);
|
|
if (!ext_block) {
|
|
printf("invalid extent block\n");
|
|
free(buf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
extent = (struct ext4_extent *)(ext_block + 1);
|
|
|
|
do {
|
|
i++;
|
|
if (i >= le16_to_cpu(ext_block->eh_entries))
|
|
break;
|
|
} while (fileblock >= le32_to_cpu(extent[i].ee_block));
|
|
if (--i >= 0) {
|
|
fileblock -= le32_to_cpu(extent[i].ee_block);
|
|
if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
|
|
start = le16_to_cpu(extent[i].ee_start_hi);
|
|
start = (start << 32) +
|
|
le32_to_cpu(extent[i].ee_start_lo);
|
|
free(buf);
|
|
return fileblock + start;
|
|
}
|
|
|
|
printf("Extent Error\n");
|
|
free(buf);
|
|
return -1;
|
|
}
|
|
|
|
/* Direct blocks. */
|
|
if (fileblock < INDIRECT_BLOCKS)
|
|
blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
|
|
|
|
/* Indirect. */
|
|
else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
|
|
if (ext4fs_indir1_block == NULL) {
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** SI ext2fs read block (indir 1)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
ext4fs_indir1_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir1_size) {
|
|
free(ext4fs_indir1_block);
|
|
ext4fs_indir1_block = NULL;
|
|
ext4fs_indir1_size = 0;
|
|
ext4fs_indir1_blkno = -1;
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** SI ext2fs read block (indir 1):"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
|
|
log2_blksz) != ext4fs_indir1_blkno) {
|
|
status =
|
|
ext4fs_devread((lbaint_t)__le32_to_cpu
|
|
(inode->b.blocks.
|
|
indir_block) << log2_blksz, 0,
|
|
blksz, (char *)ext4fs_indir1_block);
|
|
if (status == 0) {
|
|
printf("** SI ext2fs read block (indir 1)"
|
|
"failed. **\n");
|
|
return 0;
|
|
}
|
|
ext4fs_indir1_blkno =
|
|
__le32_to_cpu(inode->b.blocks.
|
|
indir_block) << log2_blksz;
|
|
}
|
|
blknr = __le32_to_cpu(ext4fs_indir1_block
|
|
[fileblock - INDIRECT_BLOCKS]);
|
|
}
|
|
/* Double indirect. */
|
|
else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
|
|
(blksz / 4 + 1)))) {
|
|
|
|
long int perblock = blksz / 4;
|
|
long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
|
|
|
|
if (ext4fs_indir1_block == NULL) {
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** DI ext2fs read block (indir 2 1)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
ext4fs_indir1_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir1_size) {
|
|
free(ext4fs_indir1_block);
|
|
ext4fs_indir1_block = NULL;
|
|
ext4fs_indir1_size = 0;
|
|
ext4fs_indir1_blkno = -1;
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** DI ext2fs read block (indir 2 1)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
|
|
log2_blksz) != ext4fs_indir1_blkno) {
|
|
status =
|
|
ext4fs_devread((lbaint_t)__le32_to_cpu
|
|
(inode->b.blocks.
|
|
double_indir_block) << log2_blksz,
|
|
0, blksz,
|
|
(char *)ext4fs_indir1_block);
|
|
if (status == 0) {
|
|
printf("** DI ext2fs read block (indir 2 1)"
|
|
"failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_blkno =
|
|
__le32_to_cpu(inode->b.blocks.double_indir_block) <<
|
|
log2_blksz;
|
|
}
|
|
|
|
if (ext4fs_indir2_block == NULL) {
|
|
ext4fs_indir2_block = zalloc(blksz);
|
|
if (ext4fs_indir2_block == NULL) {
|
|
printf("** DI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_size = blksz;
|
|
ext4fs_indir2_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir2_size) {
|
|
free(ext4fs_indir2_block);
|
|
ext4fs_indir2_block = NULL;
|
|
ext4fs_indir2_size = 0;
|
|
ext4fs_indir2_blkno = -1;
|
|
ext4fs_indir2_block = zalloc(blksz);
|
|
if (ext4fs_indir2_block == NULL) {
|
|
printf("** DI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
|
|
log2_blksz) != ext4fs_indir2_blkno) {
|
|
status = ext4fs_devread((lbaint_t)__le32_to_cpu
|
|
(ext4fs_indir1_block
|
|
[rblock /
|
|
perblock]) << log2_blksz, 0,
|
|
blksz,
|
|
(char *)ext4fs_indir2_block);
|
|
if (status == 0) {
|
|
printf("** DI ext2fs read block (indir 2 2)"
|
|
"failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_blkno =
|
|
__le32_to_cpu(ext4fs_indir1_block[rblock
|
|
/
|
|
perblock]) <<
|
|
log2_blksz;
|
|
}
|
|
blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
|
|
}
|
|
/* Tripple indirect. */
|
|
else {
|
|
rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
|
|
(blksz / 4 * blksz / 4));
|
|
perblock_child = blksz / 4;
|
|
perblock_parent = ((blksz / 4) * (blksz / 4));
|
|
|
|
if (ext4fs_indir1_block == NULL) {
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 1)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
ext4fs_indir1_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir1_size) {
|
|
free(ext4fs_indir1_block);
|
|
ext4fs_indir1_block = NULL;
|
|
ext4fs_indir1_size = 0;
|
|
ext4fs_indir1_blkno = -1;
|
|
ext4fs_indir1_block = zalloc(blksz);
|
|
if (ext4fs_indir1_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 1)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
|
|
log2_blksz) != ext4fs_indir1_blkno) {
|
|
status = ext4fs_devread
|
|
((lbaint_t)
|
|
__le32_to_cpu(inode->b.blocks.triple_indir_block)
|
|
<< log2_blksz, 0, blksz,
|
|
(char *)ext4fs_indir1_block);
|
|
if (status == 0) {
|
|
printf("** TI ext2fs read block (indir 2 1)"
|
|
"failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir1_blkno =
|
|
__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
|
|
log2_blksz;
|
|
}
|
|
|
|
if (ext4fs_indir2_block == NULL) {
|
|
ext4fs_indir2_block = zalloc(blksz);
|
|
if (ext4fs_indir2_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_size = blksz;
|
|
ext4fs_indir2_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir2_size) {
|
|
free(ext4fs_indir2_block);
|
|
ext4fs_indir2_block = NULL;
|
|
ext4fs_indir2_size = 0;
|
|
ext4fs_indir2_blkno = -1;
|
|
ext4fs_indir2_block = zalloc(blksz);
|
|
if (ext4fs_indir2_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
|
|
perblock_parent]) <<
|
|
log2_blksz)
|
|
!= ext4fs_indir2_blkno) {
|
|
status = ext4fs_devread((lbaint_t)__le32_to_cpu
|
|
(ext4fs_indir1_block
|
|
[rblock /
|
|
perblock_parent]) <<
|
|
log2_blksz, 0, blksz,
|
|
(char *)ext4fs_indir2_block);
|
|
if (status == 0) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir2_blkno =
|
|
__le32_to_cpu(ext4fs_indir1_block[rblock /
|
|
perblock_parent])
|
|
<< log2_blksz;
|
|
}
|
|
|
|
if (ext4fs_indir3_block == NULL) {
|
|
ext4fs_indir3_block = zalloc(blksz);
|
|
if (ext4fs_indir3_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir3_size = blksz;
|
|
ext4fs_indir3_blkno = -1;
|
|
}
|
|
if (blksz != ext4fs_indir3_size) {
|
|
free(ext4fs_indir3_block);
|
|
ext4fs_indir3_block = NULL;
|
|
ext4fs_indir3_size = 0;
|
|
ext4fs_indir3_blkno = -1;
|
|
ext4fs_indir3_block = zalloc(blksz);
|
|
if (ext4fs_indir3_block == NULL) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"malloc failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir3_size = blksz;
|
|
}
|
|
if ((__le32_to_cpu(ext4fs_indir2_block[rblock
|
|
/
|
|
perblock_child]) <<
|
|
log2_blksz) != ext4fs_indir3_blkno) {
|
|
status =
|
|
ext4fs_devread((lbaint_t)__le32_to_cpu
|
|
(ext4fs_indir2_block
|
|
[(rblock / perblock_child)
|
|
% (blksz / 4)]) << log2_blksz, 0,
|
|
blksz, (char *)ext4fs_indir3_block);
|
|
if (status == 0) {
|
|
printf("** TI ext2fs read block (indir 2 2)"
|
|
"failed. **\n");
|
|
return -1;
|
|
}
|
|
ext4fs_indir3_blkno =
|
|
__le32_to_cpu(ext4fs_indir2_block[(rblock /
|
|
perblock_child) %
|
|
(blksz /
|
|
4)]) <<
|
|
log2_blksz;
|
|
}
|
|
|
|
blknr = __le32_to_cpu(ext4fs_indir3_block
|
|
[rblock % perblock_child]);
|
|
}
|
|
debug("read_allocated_block %ld\n", blknr);
|
|
|
|
return blknr;
|
|
}
|
|
|
|
/**
|
|
* ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
|
|
* global pointers
|
|
*
|
|
* This function assures that for a file with the same name but different size
|
|
* the sequential store on the ext4 filesystem will be correct.
|
|
*
|
|
* In this function the global data, responsible for internal representation
|
|
* of the ext4 data are initialized to the reset state. Without this, during
|
|
* replacement of the smaller file with the bigger truncation of new file was
|
|
* performed.
|
|
*/
|
|
void ext4fs_reinit_global(void)
|
|
{
|
|
if (ext4fs_indir1_block != NULL) {
|
|
free(ext4fs_indir1_block);
|
|
ext4fs_indir1_block = NULL;
|
|
ext4fs_indir1_size = 0;
|
|
ext4fs_indir1_blkno = -1;
|
|
}
|
|
if (ext4fs_indir2_block != NULL) {
|
|
free(ext4fs_indir2_block);
|
|
ext4fs_indir2_block = NULL;
|
|
ext4fs_indir2_size = 0;
|
|
ext4fs_indir2_blkno = -1;
|
|
}
|
|
if (ext4fs_indir3_block != NULL) {
|
|
free(ext4fs_indir3_block);
|
|
ext4fs_indir3_block = NULL;
|
|
ext4fs_indir3_size = 0;
|
|
ext4fs_indir3_blkno = -1;
|
|
}
|
|
}
|
|
void ext4fs_close(void)
|
|
{
|
|
if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
|
|
ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
|
|
ext4fs_file = NULL;
|
|
}
|
|
if (ext4fs_root != NULL) {
|
|
free(ext4fs_root);
|
|
ext4fs_root = NULL;
|
|
}
|
|
|
|
ext4fs_reinit_global();
|
|
}
|
|
|
|
int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
|
|
struct ext2fs_node **fnode, int *ftype)
|
|
{
|
|
unsigned int fpos = 0;
|
|
int status;
|
|
loff_t actread;
|
|
struct ext2fs_node *diro = (struct ext2fs_node *) dir;
|
|
|
|
#ifdef DEBUG
|
|
if (name != NULL)
|
|
printf("Iterate dir %s\n", name);
|
|
#endif /* of DEBUG */
|
|
if (!diro->inode_read) {
|
|
status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
|
|
if (status == 0)
|
|
return 0;
|
|
}
|
|
/* Search the file. */
|
|
while (fpos < __le32_to_cpu(diro->inode.size)) {
|
|
struct ext2_dirent dirent;
|
|
|
|
status = ext4fs_read_file(diro, fpos,
|
|
sizeof(struct ext2_dirent),
|
|
(char *)&dirent, &actread);
|
|
if (status < 0)
|
|
return 0;
|
|
|
|
if (dirent.direntlen == 0) {
|
|
printf("Failed to iterate over directory %s\n", name);
|
|
return 0;
|
|
}
|
|
|
|
if (dirent.namelen != 0) {
|
|
char filename[dirent.namelen + 1];
|
|
struct ext2fs_node *fdiro;
|
|
int type = FILETYPE_UNKNOWN;
|
|
|
|
status = ext4fs_read_file(diro,
|
|
fpos +
|
|
sizeof(struct ext2_dirent),
|
|
dirent.namelen, filename,
|
|
&actread);
|
|
if (status < 0)
|
|
return 0;
|
|
|
|
fdiro = zalloc(sizeof(struct ext2fs_node));
|
|
if (!fdiro)
|
|
return 0;
|
|
|
|
fdiro->data = diro->data;
|
|
fdiro->ino = __le32_to_cpu(dirent.inode);
|
|
|
|
filename[dirent.namelen] = '\0';
|
|
|
|
if (dirent.filetype != FILETYPE_UNKNOWN) {
|
|
fdiro->inode_read = 0;
|
|
|
|
if (dirent.filetype == FILETYPE_DIRECTORY)
|
|
type = FILETYPE_DIRECTORY;
|
|
else if (dirent.filetype == FILETYPE_SYMLINK)
|
|
type = FILETYPE_SYMLINK;
|
|
else if (dirent.filetype == FILETYPE_REG)
|
|
type = FILETYPE_REG;
|
|
} else {
|
|
status = ext4fs_read_inode(diro->data,
|
|
__le32_to_cpu
|
|
(dirent.inode),
|
|
&fdiro->inode);
|
|
if (status == 0) {
|
|
free(fdiro);
|
|
return 0;
|
|
}
|
|
fdiro->inode_read = 1;
|
|
|
|
if ((__le16_to_cpu(fdiro->inode.mode) &
|
|
FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_DIRECTORY) {
|
|
type = FILETYPE_DIRECTORY;
|
|
} else if ((__le16_to_cpu(fdiro->inode.mode)
|
|
& FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_SYMLINK) {
|
|
type = FILETYPE_SYMLINK;
|
|
} else if ((__le16_to_cpu(fdiro->inode.mode)
|
|
& FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_REG) {
|
|
type = FILETYPE_REG;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
printf("iterate >%s<\n", filename);
|
|
#endif /* of DEBUG */
|
|
if ((name != NULL) && (fnode != NULL)
|
|
&& (ftype != NULL)) {
|
|
if (strcmp(filename, name) == 0) {
|
|
*ftype = type;
|
|
*fnode = fdiro;
|
|
return 1;
|
|
}
|
|
} else {
|
|
if (fdiro->inode_read == 0) {
|
|
status = ext4fs_read_inode(diro->data,
|
|
__le32_to_cpu(
|
|
dirent.inode),
|
|
&fdiro->inode);
|
|
if (status == 0) {
|
|
free(fdiro);
|
|
return 0;
|
|
}
|
|
fdiro->inode_read = 1;
|
|
}
|
|
switch (type) {
|
|
case FILETYPE_DIRECTORY:
|
|
printf("<DIR> ");
|
|
break;
|
|
case FILETYPE_SYMLINK:
|
|
printf("<SYM> ");
|
|
break;
|
|
case FILETYPE_REG:
|
|
printf(" ");
|
|
break;
|
|
default:
|
|
printf("< ? > ");
|
|
break;
|
|
}
|
|
printf("%10u %s\n",
|
|
__le32_to_cpu(fdiro->inode.size),
|
|
filename);
|
|
}
|
|
free(fdiro);
|
|
}
|
|
fpos += __le16_to_cpu(dirent.direntlen);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static char *ext4fs_read_symlink(struct ext2fs_node *node)
|
|
{
|
|
char *symlink;
|
|
struct ext2fs_node *diro = node;
|
|
int status;
|
|
loff_t actread;
|
|
|
|
if (!diro->inode_read) {
|
|
status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
|
|
if (status == 0)
|
|
return 0;
|
|
}
|
|
symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
|
|
if (!symlink)
|
|
return 0;
|
|
|
|
if (__le32_to_cpu(diro->inode.size) <= 60) {
|
|
strncpy(symlink, diro->inode.b.symlink,
|
|
__le32_to_cpu(diro->inode.size));
|
|
} else {
|
|
status = ext4fs_read_file(diro, 0,
|
|
__le32_to_cpu(diro->inode.size),
|
|
symlink, &actread);
|
|
if ((status < 0) || (actread == 0)) {
|
|
free(symlink);
|
|
return 0;
|
|
}
|
|
}
|
|
symlink[__le32_to_cpu(diro->inode.size)] = '\0';
|
|
return symlink;
|
|
}
|
|
|
|
static int ext4fs_find_file1(const char *currpath,
|
|
struct ext2fs_node *currroot,
|
|
struct ext2fs_node **currfound, int *foundtype)
|
|
{
|
|
char fpath[strlen(currpath) + 1];
|
|
char *name = fpath;
|
|
char *next;
|
|
int status;
|
|
int type = FILETYPE_DIRECTORY;
|
|
struct ext2fs_node *currnode = currroot;
|
|
struct ext2fs_node *oldnode = currroot;
|
|
|
|
strncpy(fpath, currpath, strlen(currpath) + 1);
|
|
|
|
/* Remove all leading slashes. */
|
|
while (*name == '/')
|
|
name++;
|
|
|
|
if (!*name) {
|
|
*currfound = currnode;
|
|
return 1;
|
|
}
|
|
|
|
for (;;) {
|
|
int found;
|
|
|
|
/* Extract the actual part from the pathname. */
|
|
next = strchr(name, '/');
|
|
if (next) {
|
|
/* Remove all leading slashes. */
|
|
while (*next == '/')
|
|
*(next++) = '\0';
|
|
}
|
|
|
|
if (type != FILETYPE_DIRECTORY) {
|
|
ext4fs_free_node(currnode, currroot);
|
|
return 0;
|
|
}
|
|
|
|
oldnode = currnode;
|
|
|
|
/* Iterate over the directory. */
|
|
found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
|
|
if (found == 0)
|
|
return 0;
|
|
|
|
if (found == -1)
|
|
break;
|
|
|
|
/* Read in the symlink and follow it. */
|
|
if (type == FILETYPE_SYMLINK) {
|
|
char *symlink;
|
|
|
|
/* Test if the symlink does not loop. */
|
|
if (++symlinknest == 8) {
|
|
ext4fs_free_node(currnode, currroot);
|
|
ext4fs_free_node(oldnode, currroot);
|
|
return 0;
|
|
}
|
|
|
|
symlink = ext4fs_read_symlink(currnode);
|
|
ext4fs_free_node(currnode, currroot);
|
|
|
|
if (!symlink) {
|
|
ext4fs_free_node(oldnode, currroot);
|
|
return 0;
|
|
}
|
|
|
|
debug("Got symlink >%s<\n", symlink);
|
|
|
|
if (symlink[0] == '/') {
|
|
ext4fs_free_node(oldnode, currroot);
|
|
oldnode = &ext4fs_root->diropen;
|
|
}
|
|
|
|
/* Lookup the node the symlink points to. */
|
|
status = ext4fs_find_file1(symlink, oldnode,
|
|
&currnode, &type);
|
|
|
|
free(symlink);
|
|
|
|
if (status == 0) {
|
|
ext4fs_free_node(oldnode, currroot);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
ext4fs_free_node(oldnode, currroot);
|
|
|
|
/* Found the node! */
|
|
if (!next || *next == '\0') {
|
|
*currfound = currnode;
|
|
*foundtype = type;
|
|
return 1;
|
|
}
|
|
name = next;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
|
|
struct ext2fs_node **foundnode, int expecttype)
|
|
{
|
|
int status;
|
|
int foundtype = FILETYPE_DIRECTORY;
|
|
|
|
symlinknest = 0;
|
|
if (!path)
|
|
return 0;
|
|
|
|
status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
|
|
if (status == 0)
|
|
return 0;
|
|
|
|
/* Check if the node that was found was of the expected type. */
|
|
if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
|
|
return 0;
|
|
else if ((expecttype == FILETYPE_DIRECTORY)
|
|
&& (foundtype != expecttype))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int ext4fs_open(const char *filename, loff_t *len)
|
|
{
|
|
struct ext2fs_node *fdiro = NULL;
|
|
int status;
|
|
|
|
if (ext4fs_root == NULL)
|
|
return -1;
|
|
|
|
ext4fs_file = NULL;
|
|
status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
|
|
FILETYPE_REG);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
if (!fdiro->inode_read) {
|
|
status = ext4fs_read_inode(fdiro->data, fdiro->ino,
|
|
&fdiro->inode);
|
|
if (status == 0)
|
|
goto fail;
|
|
}
|
|
*len = __le32_to_cpu(fdiro->inode.size);
|
|
ext4fs_file = fdiro;
|
|
|
|
return 0;
|
|
fail:
|
|
ext4fs_free_node(fdiro, &ext4fs_root->diropen);
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ext4fs_mount(unsigned part_length)
|
|
{
|
|
struct ext2_data *data;
|
|
int status;
|
|
struct ext_filesystem *fs = get_fs();
|
|
data = zalloc(SUPERBLOCK_SIZE);
|
|
if (!data)
|
|
return 0;
|
|
|
|
/* Read the superblock. */
|
|
status = ext4_read_superblock((char *)&data->sblock);
|
|
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
/* Make sure this is an ext2 filesystem. */
|
|
if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
|
|
goto fail;
|
|
|
|
if (__le32_to_cpu(data->sblock.revision_level == 0))
|
|
fs->inodesz = 128;
|
|
else
|
|
fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
|
|
|
|
debug("EXT2 rev %d, inode_size %d\n",
|
|
__le32_to_cpu(data->sblock.revision_level), fs->inodesz);
|
|
|
|
data->diropen.data = data;
|
|
data->diropen.ino = 2;
|
|
data->diropen.inode_read = 1;
|
|
data->inode = &data->diropen.inode;
|
|
|
|
status = ext4fs_read_inode(data, 2, data->inode);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
ext4fs_root = data;
|
|
|
|
return 1;
|
|
fail:
|
|
printf("Failed to mount ext2 filesystem...\n");
|
|
free(data);
|
|
ext4fs_root = NULL;
|
|
|
|
return 0;
|
|
}
|