1070 lines
29 KiB
C
1070 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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 and load support in Uboot.
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* Ext4 read optimization taken from Open-Moko
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* Qi bootloader
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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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#include <common.h>
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#include <blk.h>
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#include <log.h>
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#include <malloc.h>
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#include <memalign.h>
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#include <part.h>
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#include <linux/stat.h>
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#include <div64.h>
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#include "ext4_common.h"
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static inline void ext4fs_sb_free_inodes_inc(struct ext2_sblock *sb)
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{
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sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) + 1);
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}
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static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb)
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{
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sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1);
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}
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static inline void ext4fs_bg_free_inodes_inc
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(struct ext2_block_group *bg, const struct ext_filesystem *fs)
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{
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uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
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if (fs->gdsize == 64)
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free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
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free_inodes++;
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bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
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if (fs->gdsize == 64)
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bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
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}
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static inline void ext4fs_bg_free_blocks_inc
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(struct ext2_block_group *bg, const struct ext_filesystem *fs)
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{
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uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
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if (fs->gdsize == 64)
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free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
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free_blocks++;
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bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
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if (fs->gdsize == 64)
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bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
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}
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static void ext4fs_update(void)
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{
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short i;
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ext4fs_update_journal();
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struct ext_filesystem *fs = get_fs();
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struct ext2_block_group *bgd = NULL;
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/* update super block */
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put_ext4((uint64_t)(SUPERBLOCK_SIZE),
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(struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
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/* update block bitmaps */
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for (i = 0; i < fs->no_blkgrp; i++) {
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bgd = ext4fs_get_group_descriptor(fs, i);
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bgd->bg_checksum = cpu_to_le16(ext4fs_checksum_update(i));
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uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
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put_ext4(b_bitmap_blk * fs->blksz,
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fs->blk_bmaps[i], fs->blksz);
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}
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/* update inode bitmaps */
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for (i = 0; i < fs->no_blkgrp; i++) {
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bgd = ext4fs_get_group_descriptor(fs, i);
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uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
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put_ext4(i_bitmap_blk * fs->blksz,
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fs->inode_bmaps[i], fs->blksz);
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}
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/* update the block group descriptor table */
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put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz),
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(struct ext2_block_group *)fs->gdtable,
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(fs->blksz * fs->no_blk_pergdt));
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ext4fs_dump_metadata();
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gindex = 0;
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gd_index = 0;
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}
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int ext4fs_get_bgdtable(void)
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{
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int status;
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struct ext_filesystem *fs = get_fs();
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int gdsize_total = ROUND(fs->no_blkgrp * fs->gdsize, fs->blksz);
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fs->no_blk_pergdt = gdsize_total / fs->blksz;
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/* allocate memory for gdtable */
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fs->gdtable = zalloc(gdsize_total);
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if (!fs->gdtable)
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return -ENOMEM;
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/* read the group descriptor table */
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status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk,
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0, fs->blksz * fs->no_blk_pergdt, fs->gdtable);
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if (status == 0)
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goto fail;
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if (ext4fs_log_gdt(fs->gdtable)) {
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printf("Error in ext4fs_log_gdt\n");
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return -1;
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}
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return 0;
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fail:
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free(fs->gdtable);
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fs->gdtable = NULL;
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return -1;
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}
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static void delete_single_indirect_block(struct ext2_inode *inode)
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{
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struct ext2_block_group *bgd = NULL;
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static int prev_bg_bmap_idx = -1;
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uint32_t blknr;
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int remainder;
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int bg_idx;
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int status;
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uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
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struct ext_filesystem *fs = get_fs();
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char *journal_buffer = zalloc(fs->blksz);
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if (!journal_buffer) {
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printf("No memory\n");
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return;
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}
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/* deleting the single indirect block associated with inode */
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if (inode->b.blocks.indir_block != 0) {
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blknr = le32_to_cpu(inode->b.blocks.indir_block);
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debug("SIPB releasing %u\n", blknr);
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bg_idx = blknr / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = blknr % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
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status = ext4fs_devread(
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b_bitmap_blk * fs->sect_perblk,
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0, fs->blksz, journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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}
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fail:
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free(journal_buffer);
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}
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static void delete_double_indirect_block(struct ext2_inode *inode)
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{
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int i;
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short status;
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static int prev_bg_bmap_idx = -1;
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uint32_t blknr;
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int remainder;
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int bg_idx;
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uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
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__le32 *di_buffer = NULL;
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void *dib_start_addr = NULL;
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struct ext2_block_group *bgd = NULL;
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struct ext_filesystem *fs = get_fs();
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char *journal_buffer = zalloc(fs->blksz);
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if (!journal_buffer) {
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printf("No memory\n");
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return;
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}
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if (inode->b.blocks.double_indir_block != 0) {
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di_buffer = zalloc(fs->blksz);
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if (!di_buffer) {
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printf("No memory\n");
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return;
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}
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dib_start_addr = di_buffer;
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blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
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status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
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fs->blksz, (char *)di_buffer);
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for (i = 0; i < fs->blksz / sizeof(int); i++) {
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if (*di_buffer == 0)
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break;
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debug("DICB releasing %u\n", *di_buffer);
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bg_idx = le32_to_cpu(*di_buffer) / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = le32_to_cpu(*di_buffer) % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer),
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fs->blk_bmaps[bg_idx], bg_idx);
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di_buffer++;
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk =
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ext4fs_bg_get_block_id(bgd, fs);
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status = ext4fs_devread(b_bitmap_blk
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* fs->sect_perblk, 0,
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fs->blksz,
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journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer,
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b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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}
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/* removing the parent double indirect block */
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blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
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bg_idx = blknr / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = blknr % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
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status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
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0, fs->blksz, journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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debug("DIPB releasing %d\n", blknr);
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}
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fail:
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free(dib_start_addr);
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free(journal_buffer);
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}
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static void delete_triple_indirect_block(struct ext2_inode *inode)
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{
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int i, j;
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short status;
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static int prev_bg_bmap_idx = -1;
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uint32_t blknr;
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int remainder;
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int bg_idx;
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uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
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__le32 *tigp_buffer = NULL;
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void *tib_start_addr = NULL;
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__le32 *tip_buffer = NULL;
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void *tipb_start_addr = NULL;
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struct ext2_block_group *bgd = NULL;
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struct ext_filesystem *fs = get_fs();
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char *journal_buffer = zalloc(fs->blksz);
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if (!journal_buffer) {
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printf("No memory\n");
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return;
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}
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if (inode->b.blocks.triple_indir_block != 0) {
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tigp_buffer = zalloc(fs->blksz);
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if (!tigp_buffer) {
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printf("No memory\n");
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return;
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}
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tib_start_addr = tigp_buffer;
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blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
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status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
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fs->blksz, (char *)tigp_buffer);
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for (i = 0; i < fs->blksz / sizeof(int); i++) {
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if (*tigp_buffer == 0)
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break;
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debug("tigp buffer releasing %u\n", *tigp_buffer);
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tip_buffer = zalloc(fs->blksz);
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if (!tip_buffer)
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goto fail;
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tipb_start_addr = tip_buffer;
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status = ext4fs_devread((lbaint_t)le32_to_cpu(*tigp_buffer) *
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fs->sect_perblk, 0, fs->blksz,
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(char *)tip_buffer);
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for (j = 0; j < fs->blksz / sizeof(int); j++) {
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if (le32_to_cpu(*tip_buffer) == 0)
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break;
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bg_idx = le32_to_cpu(*tip_buffer) / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = le32_to_cpu(*tip_buffer) % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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ext4fs_reset_block_bmap(le32_to_cpu(*tip_buffer),
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fs->blk_bmaps[bg_idx],
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bg_idx);
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tip_buffer++;
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk =
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ext4fs_bg_get_block_id(bgd, fs);
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status =
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ext4fs_devread(
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b_bitmap_blk *
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fs->sect_perblk, 0,
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fs->blksz,
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journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer,
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b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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}
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free(tipb_start_addr);
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tipb_start_addr = NULL;
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/*
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* removing the grand parent blocks
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* which is connected to inode
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*/
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bg_idx = le32_to_cpu(*tigp_buffer) / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = le32_to_cpu(*tigp_buffer) % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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ext4fs_reset_block_bmap(le32_to_cpu(*tigp_buffer),
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fs->blk_bmaps[bg_idx], bg_idx);
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tigp_buffer++;
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk =
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ext4fs_bg_get_block_id(bgd, fs);
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memset(journal_buffer, '\0', fs->blksz);
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status = ext4fs_devread(b_bitmap_blk *
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fs->sect_perblk, 0,
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fs->blksz,
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journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer,
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b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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}
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/* removing the grand parent triple indirect block */
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blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
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bg_idx = blknr / blk_per_grp;
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if (fs->blksz == 1024) {
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remainder = blknr % blk_per_grp;
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if (!remainder)
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bg_idx--;
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}
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ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
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/* get block group descriptor table */
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bgd = ext4fs_get_group_descriptor(fs, bg_idx);
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ext4fs_bg_free_blocks_inc(bgd, fs);
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ext4fs_sb_free_blocks_inc(fs->sb);
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/* journal backup */
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if (prev_bg_bmap_idx != bg_idx) {
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uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
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status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
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0, fs->blksz, journal_buffer);
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if (status == 0)
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goto fail;
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if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
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goto fail;
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prev_bg_bmap_idx = bg_idx;
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}
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debug("tigp buffer itself releasing %d\n", blknr);
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}
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fail:
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free(tib_start_addr);
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free(tipb_start_addr);
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free(journal_buffer);
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}
|
|
|
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static int ext4fs_delete_file(int inodeno)
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|
{
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struct ext2_inode inode;
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short status;
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int i;
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int remainder;
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long int blknr;
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int bg_idx;
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int ibmap_idx;
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char *read_buffer = NULL;
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char *start_block_address = NULL;
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uint32_t no_blocks;
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|
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static int prev_bg_bmap_idx = -1;
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unsigned int inodes_per_block;
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uint32_t blkno;
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unsigned int blkoff;
|
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uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
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uint32_t inode_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
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struct ext2_inode *inode_buffer = NULL;
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struct ext2_block_group *bgd = NULL;
|
|
struct ext_filesystem *fs = get_fs();
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|
char *journal_buffer = zalloc(fs->blksz);
|
|
if (!journal_buffer)
|
|
return -ENOMEM;
|
|
status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
/* read the block no allocated to a file */
|
|
no_blocks = le32_to_cpu(inode.size) / fs->blksz;
|
|
if (le32_to_cpu(inode.size) % fs->blksz)
|
|
no_blocks++;
|
|
|
|
/*
|
|
* special case for symlinks whose target are small enough that
|
|
*it fits in struct ext2_inode.b.symlink: no block had been allocated
|
|
*/
|
|
if ((le16_to_cpu(inode.mode) & S_IFLNK) &&
|
|
le32_to_cpu(inode.size) <= sizeof(inode.b.symlink)) {
|
|
no_blocks = 0;
|
|
}
|
|
|
|
if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
|
|
/* FIXME delete extent index blocks, i.e. eh_depth >= 1 */
|
|
struct ext4_extent_header *eh =
|
|
(struct ext4_extent_header *)
|
|
inode.b.blocks.dir_blocks;
|
|
debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries);
|
|
} else {
|
|
delete_single_indirect_block(&inode);
|
|
delete_double_indirect_block(&inode);
|
|
delete_triple_indirect_block(&inode);
|
|
}
|
|
|
|
/* release data blocks */
|
|
for (i = 0; i < no_blocks; i++) {
|
|
blknr = read_allocated_block(&inode, i, NULL);
|
|
if (blknr == 0)
|
|
continue;
|
|
if (blknr < 0)
|
|
goto fail;
|
|
bg_idx = blknr / blk_per_grp;
|
|
if (fs->blksz == 1024) {
|
|
remainder = blknr % blk_per_grp;
|
|
if (!remainder)
|
|
bg_idx--;
|
|
}
|
|
ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
|
|
bg_idx);
|
|
debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx);
|
|
|
|
/* get block group descriptor table */
|
|
bgd = ext4fs_get_group_descriptor(fs, bg_idx);
|
|
ext4fs_bg_free_blocks_inc(bgd, fs);
|
|
ext4fs_sb_free_blocks_inc(fs->sb);
|
|
/* journal backup */
|
|
if (prev_bg_bmap_idx != bg_idx) {
|
|
uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
|
|
status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
|
|
0, fs->blksz,
|
|
journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
|
|
goto fail;
|
|
prev_bg_bmap_idx = bg_idx;
|
|
}
|
|
}
|
|
|
|
/* release inode */
|
|
/* from the inode no to blockno */
|
|
inodes_per_block = fs->blksz / fs->inodesz;
|
|
ibmap_idx = inodeno / inode_per_grp;
|
|
|
|
/* get the block no */
|
|
inodeno--;
|
|
/* get block group descriptor table */
|
|
bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
|
|
blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
|
|
(inodeno % inode_per_grp) / inodes_per_block;
|
|
|
|
/* get the offset of the inode */
|
|
blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
|
|
|
|
/* read the block no containing the inode */
|
|
read_buffer = zalloc(fs->blksz);
|
|
if (!read_buffer)
|
|
goto fail;
|
|
start_block_address = read_buffer;
|
|
status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
|
|
0, fs->blksz, read_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
|
|
if (ext4fs_log_journal(read_buffer, blkno))
|
|
goto fail;
|
|
|
|
read_buffer = read_buffer + blkoff;
|
|
inode_buffer = (struct ext2_inode *)read_buffer;
|
|
memset(inode_buffer, '\0', fs->inodesz);
|
|
|
|
/* write the inode to original position in inode table */
|
|
if (ext4fs_put_metadata(start_block_address, blkno))
|
|
goto fail;
|
|
|
|
/* update the respective inode bitmaps */
|
|
inodeno++;
|
|
ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
|
|
ext4fs_bg_free_inodes_inc(bgd, fs);
|
|
ext4fs_sb_free_inodes_inc(fs->sb);
|
|
/* journal backup */
|
|
memset(journal_buffer, '\0', fs->blksz);
|
|
status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) *
|
|
fs->sect_perblk, 0, fs->blksz, journal_buffer);
|
|
if (status == 0)
|
|
goto fail;
|
|
if (ext4fs_log_journal(journal_buffer, ext4fs_bg_get_inode_id(bgd, fs)))
|
|
goto fail;
|
|
|
|
ext4fs_update();
|
|
ext4fs_deinit();
|
|
ext4fs_reinit_global();
|
|
|
|
if (ext4fs_init() != 0) {
|
|
printf("error in File System init\n");
|
|
goto fail;
|
|
}
|
|
|
|
free(start_block_address);
|
|
free(journal_buffer);
|
|
|
|
return 0;
|
|
fail:
|
|
free(start_block_address);
|
|
free(journal_buffer);
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ext4fs_init(void)
|
|
{
|
|
short status;
|
|
int i;
|
|
uint32_t real_free_blocks = 0;
|
|
struct ext_filesystem *fs = get_fs();
|
|
|
|
/* populate fs */
|
|
fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
|
|
fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
|
|
|
|
/* get the superblock */
|
|
fs->sb = zalloc(SUPERBLOCK_SIZE);
|
|
if (!fs->sb)
|
|
return -ENOMEM;
|
|
if (!ext4_read_superblock((char *)fs->sb))
|
|
goto fail;
|
|
|
|
/* init journal */
|
|
if (ext4fs_init_journal())
|
|
goto fail;
|
|
|
|
/* get total no of blockgroups */
|
|
fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
|
|
le32_to_cpu(ext4fs_root->sblock.total_blocks)
|
|
- le32_to_cpu(ext4fs_root->sblock.first_data_block),
|
|
le32_to_cpu(ext4fs_root->sblock.blocks_per_group));
|
|
|
|
/* get the block group descriptor table */
|
|
fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
|
|
if (ext4fs_get_bgdtable() == -1) {
|
|
printf("Error in getting the block group descriptor table\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* load all the available bitmap block of the partition */
|
|
fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
|
|
if (!fs->blk_bmaps)
|
|
goto fail;
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
fs->blk_bmaps[i] = zalloc(fs->blksz);
|
|
if (!fs->blk_bmaps[i])
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
struct ext2_block_group *bgd =
|
|
ext4fs_get_group_descriptor(fs, i);
|
|
status = ext4fs_devread(ext4fs_bg_get_block_id(bgd, fs) *
|
|
fs->sect_perblk, 0,
|
|
fs->blksz, (char *)fs->blk_bmaps[i]);
|
|
if (status == 0)
|
|
goto fail;
|
|
}
|
|
|
|
/* load all the available inode bitmap of the partition */
|
|
fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
|
|
if (!fs->inode_bmaps)
|
|
goto fail;
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
fs->inode_bmaps[i] = zalloc(fs->blksz);
|
|
if (!fs->inode_bmaps[i])
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
struct ext2_block_group *bgd =
|
|
ext4fs_get_group_descriptor(fs, i);
|
|
status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) *
|
|
fs->sect_perblk,
|
|
0, fs->blksz,
|
|
(char *)fs->inode_bmaps[i]);
|
|
if (status == 0)
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* check filesystem consistency with free blocks of file system
|
|
* some time we observed that superblock freeblocks does not match
|
|
* with the blockgroups freeblocks when improper
|
|
* reboot of a linux kernel
|
|
*/
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
struct ext2_block_group *bgd =
|
|
ext4fs_get_group_descriptor(fs, i);
|
|
real_free_blocks = real_free_blocks +
|
|
ext4fs_bg_get_free_blocks(bgd, fs);
|
|
}
|
|
if (real_free_blocks != ext4fs_sb_get_free_blocks(fs->sb))
|
|
ext4fs_sb_set_free_blocks(fs->sb, real_free_blocks);
|
|
|
|
return 0;
|
|
fail:
|
|
ext4fs_deinit();
|
|
|
|
return -1;
|
|
}
|
|
|
|
void ext4fs_deinit(void)
|
|
{
|
|
int i;
|
|
struct ext2_inode inode_journal;
|
|
struct journal_superblock_t *jsb;
|
|
uint32_t blknr;
|
|
struct ext_filesystem *fs = get_fs();
|
|
uint32_t new_feature_incompat;
|
|
|
|
/* free journal */
|
|
char *temp_buff = zalloc(fs->blksz);
|
|
if (temp_buff) {
|
|
ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
|
|
&inode_journal);
|
|
blknr = read_allocated_block(&inode_journal,
|
|
EXT2_JOURNAL_SUPERBLOCK, NULL);
|
|
ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
|
|
temp_buff);
|
|
jsb = (struct journal_superblock_t *)temp_buff;
|
|
jsb->s_start = 0;
|
|
put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
|
|
(struct journal_superblock_t *)temp_buff, fs->blksz);
|
|
free(temp_buff);
|
|
}
|
|
ext4fs_free_journal();
|
|
|
|
/* get the superblock */
|
|
ext4_read_superblock((char *)fs->sb);
|
|
new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat);
|
|
new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
|
|
fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat);
|
|
put_ext4((uint64_t)(SUPERBLOCK_SIZE),
|
|
(struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
|
|
free(fs->sb);
|
|
fs->sb = NULL;
|
|
|
|
if (fs->blk_bmaps) {
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
free(fs->blk_bmaps[i]);
|
|
fs->blk_bmaps[i] = NULL;
|
|
}
|
|
free(fs->blk_bmaps);
|
|
fs->blk_bmaps = NULL;
|
|
}
|
|
|
|
if (fs->inode_bmaps) {
|
|
for (i = 0; i < fs->no_blkgrp; i++) {
|
|
free(fs->inode_bmaps[i]);
|
|
fs->inode_bmaps[i] = NULL;
|
|
}
|
|
free(fs->inode_bmaps);
|
|
fs->inode_bmaps = NULL;
|
|
}
|
|
|
|
|
|
free(fs->gdtable);
|
|
fs->gdtable = NULL;
|
|
/*
|
|
* reinitiliazed the global inode and
|
|
* block bitmap first execution check variables
|
|
*/
|
|
fs->first_pass_ibmap = 0;
|
|
fs->first_pass_bbmap = 0;
|
|
fs->curr_inode_no = 0;
|
|
fs->curr_blkno = 0;
|
|
}
|
|
|
|
/*
|
|
* Write data to filesystem blocks. Uses same optimization for
|
|
* contigous sectors as ext4fs_read_file
|
|
*/
|
|
static int ext4fs_write_file(struct ext2_inode *file_inode,
|
|
int pos, unsigned int len, const char *buf)
|
|
{
|
|
int i;
|
|
int blockcnt;
|
|
uint32_t filesize = le32_to_cpu(file_inode->size);
|
|
struct ext_filesystem *fs = get_fs();
|
|
int log2blksz = fs->dev_desc->log2blksz;
|
|
int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
|
|
int previous_block_number = -1;
|
|
int delayed_start = 0;
|
|
int delayed_extent = 0;
|
|
int delayed_next = 0;
|
|
const char *delayed_buf = NULL;
|
|
|
|
/* Adjust len so it we can't read past the end of the file. */
|
|
if (len > filesize)
|
|
len = filesize;
|
|
|
|
blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
|
|
|
|
for (i = pos / fs->blksz; i < blockcnt; i++) {
|
|
long int blknr;
|
|
int blockend = fs->blksz;
|
|
int skipfirst = 0;
|
|
blknr = read_allocated_block(file_inode, i, NULL);
|
|
if (blknr <= 0)
|
|
return -1;
|
|
|
|
blknr = blknr << log2_fs_blocksize;
|
|
|
|
if (blknr) {
|
|
if (previous_block_number != -1) {
|
|
if (delayed_next == blknr) {
|
|
delayed_extent += blockend;
|
|
delayed_next += blockend >> log2blksz;
|
|
} else { /* spill */
|
|
put_ext4((uint64_t)
|
|
((uint64_t)delayed_start << log2blksz),
|
|
delayed_buf,
|
|
(uint32_t) delayed_extent);
|
|
previous_block_number = blknr;
|
|
delayed_start = blknr;
|
|
delayed_extent = blockend;
|
|
delayed_buf = buf;
|
|
delayed_next = blknr +
|
|
(blockend >> log2blksz);
|
|
}
|
|
} else {
|
|
previous_block_number = blknr;
|
|
delayed_start = blknr;
|
|
delayed_extent = blockend;
|
|
delayed_buf = buf;
|
|
delayed_next = blknr +
|
|
(blockend >> log2blksz);
|
|
}
|
|
} else {
|
|
if (previous_block_number != -1) {
|
|
/* spill */
|
|
put_ext4((uint64_t) ((uint64_t)delayed_start <<
|
|
log2blksz),
|
|
delayed_buf,
|
|
(uint32_t) delayed_extent);
|
|
previous_block_number = -1;
|
|
}
|
|
}
|
|
buf += fs->blksz - skipfirst;
|
|
}
|
|
if (previous_block_number != -1) {
|
|
/* spill */
|
|
put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
|
|
delayed_buf, (uint32_t) delayed_extent);
|
|
previous_block_number = -1;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
int ext4fs_write(const char *fname, const char *buffer,
|
|
unsigned long sizebytes, int type)
|
|
{
|
|
int ret = 0;
|
|
struct ext2_inode *file_inode = NULL;
|
|
unsigned char *inode_buffer = NULL;
|
|
int parent_inodeno;
|
|
int inodeno;
|
|
time_t timestamp = 0;
|
|
|
|
uint64_t bytes_reqd_for_file;
|
|
unsigned int blks_reqd_for_file;
|
|
unsigned int blocks_remaining;
|
|
int existing_file_inodeno;
|
|
char *temp_ptr = NULL;
|
|
long int itable_blkno;
|
|
long int parent_itable_blkno;
|
|
long int blkoff;
|
|
struct ext2_sblock *sblock = &(ext4fs_root->sblock);
|
|
unsigned int inodes_per_block;
|
|
unsigned int ibmap_idx;
|
|
struct ext2_block_group *bgd = NULL;
|
|
struct ext_filesystem *fs = get_fs();
|
|
ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
|
|
bool store_link_in_inode = false;
|
|
memset(filename, 0x00, 256);
|
|
|
|
if (type != FILETYPE_REG && type != FILETYPE_SYMLINK)
|
|
return -1;
|
|
|
|
g_parent_inode = zalloc(fs->inodesz);
|
|
if (!g_parent_inode)
|
|
goto fail;
|
|
|
|
if (ext4fs_init() != 0) {
|
|
printf("error in File System init\n");
|
|
return -1;
|
|
}
|
|
|
|
if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) {
|
|
printf("Unsupported feature metadata_csum found, not writing.\n");
|
|
return -1;
|
|
}
|
|
|
|
inodes_per_block = fs->blksz / fs->inodesz;
|
|
parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
|
|
if (parent_inodeno == -1)
|
|
goto fail;
|
|
if (ext4fs_iget(parent_inodeno, g_parent_inode))
|
|
goto fail;
|
|
/* do not mess up a directory using hash trees */
|
|
if (le32_to_cpu(g_parent_inode->flags) & EXT4_INDEX_FL) {
|
|
printf("hash tree directory\n");
|
|
goto fail;
|
|
}
|
|
/* check if the filename is already present in root */
|
|
existing_file_inodeno = ext4fs_filename_unlink(filename);
|
|
if (existing_file_inodeno != -1) {
|
|
ret = ext4fs_delete_file(existing_file_inodeno);
|
|
fs->first_pass_bbmap = 0;
|
|
fs->curr_blkno = 0;
|
|
|
|
fs->first_pass_ibmap = 0;
|
|
fs->curr_inode_no = 0;
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
|
|
/* calculate how many blocks required */
|
|
if (type == FILETYPE_SYMLINK &&
|
|
sizebytes <= sizeof(file_inode->b.symlink)) {
|
|
store_link_in_inode = true;
|
|
bytes_reqd_for_file = 0;
|
|
} else {
|
|
bytes_reqd_for_file = sizebytes;
|
|
}
|
|
|
|
blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
|
|
if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
|
|
blks_reqd_for_file++;
|
|
debug("total bytes for a file %u\n", blks_reqd_for_file);
|
|
}
|
|
blocks_remaining = blks_reqd_for_file;
|
|
/* test for available space in partition */
|
|
if (le32_to_cpu(fs->sb->free_blocks) < blks_reqd_for_file) {
|
|
printf("Not enough space on partition !!!\n");
|
|
goto fail;
|
|
}
|
|
|
|
inodeno = ext4fs_update_parent_dentry(filename, type);
|
|
if (inodeno == -1)
|
|
goto fail;
|
|
/* prepare file inode */
|
|
inode_buffer = zalloc(fs->inodesz);
|
|
if (!inode_buffer)
|
|
goto fail;
|
|
file_inode = (struct ext2_inode *)inode_buffer;
|
|
file_inode->size = cpu_to_le32(sizebytes);
|
|
if (type == FILETYPE_SYMLINK) {
|
|
file_inode->mode = cpu_to_le16(S_IFLNK | S_IRWXU | S_IRWXG |
|
|
S_IRWXO);
|
|
if (store_link_in_inode) {
|
|
strncpy(file_inode->b.symlink, buffer, sizebytes);
|
|
sizebytes = 0;
|
|
}
|
|
} else {
|
|
file_inode->mode = cpu_to_le16(S_IFREG | S_IRWXU | S_IRGRP |
|
|
S_IROTH | S_IXGRP | S_IXOTH);
|
|
}
|
|
/* ToDo: Update correct time */
|
|
file_inode->mtime = cpu_to_le32(timestamp);
|
|
file_inode->atime = cpu_to_le32(timestamp);
|
|
file_inode->ctime = cpu_to_le32(timestamp);
|
|
file_inode->nlinks = cpu_to_le16(1);
|
|
|
|
/* Allocate data blocks */
|
|
ext4fs_allocate_blocks(file_inode, blocks_remaining,
|
|
&blks_reqd_for_file);
|
|
file_inode->blockcnt = cpu_to_le32((blks_reqd_for_file * fs->blksz) >>
|
|
LOG2_SECTOR_SIZE);
|
|
|
|
temp_ptr = zalloc(fs->blksz);
|
|
if (!temp_ptr)
|
|
goto fail;
|
|
ibmap_idx = inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
|
|
inodeno--;
|
|
bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
|
|
itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
|
|
(inodeno % le32_to_cpu(sblock->inodes_per_group)) /
|
|
inodes_per_block;
|
|
blkoff = (inodeno % inodes_per_block) * fs->inodesz;
|
|
ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
|
|
temp_ptr);
|
|
if (ext4fs_log_journal(temp_ptr, itable_blkno))
|
|
goto fail;
|
|
|
|
memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
|
|
if (ext4fs_put_metadata(temp_ptr, itable_blkno))
|
|
goto fail;
|
|
/* copy the file content into data blocks */
|
|
if (ext4fs_write_file(file_inode, 0, sizebytes, buffer) == -1) {
|
|
printf("Error in copying content\n");
|
|
/* FIXME: Deallocate data blocks */
|
|
goto fail;
|
|
}
|
|
ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
|
|
parent_inodeno--;
|
|
bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
|
|
parent_itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
|
|
(parent_inodeno %
|
|
le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
|
|
blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
|
|
if (parent_itable_blkno != itable_blkno) {
|
|
memset(temp_ptr, '\0', fs->blksz);
|
|
ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
|
|
0, fs->blksz, temp_ptr);
|
|
if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
|
|
goto fail;
|
|
|
|
memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
|
|
if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
|
|
goto fail;
|
|
} else {
|
|
/*
|
|
* If parent and child fall in same inode table block
|
|
* both should be kept in 1 buffer
|
|
*/
|
|
memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
|
|
gd_index--;
|
|
if (ext4fs_put_metadata(temp_ptr, itable_blkno))
|
|
goto fail;
|
|
}
|
|
ext4fs_update();
|
|
ext4fs_deinit();
|
|
|
|
fs->first_pass_bbmap = 0;
|
|
fs->curr_blkno = 0;
|
|
fs->first_pass_ibmap = 0;
|
|
fs->curr_inode_no = 0;
|
|
free(inode_buffer);
|
|
free(g_parent_inode);
|
|
free(temp_ptr);
|
|
g_parent_inode = NULL;
|
|
|
|
return 0;
|
|
fail:
|
|
ext4fs_deinit();
|
|
free(inode_buffer);
|
|
free(g_parent_inode);
|
|
free(temp_ptr);
|
|
g_parent_inode = NULL;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ext4_write_file(const char *filename, void *buf, loff_t offset,
|
|
loff_t len, loff_t *actwrite)
|
|
{
|
|
int ret;
|
|
|
|
if (offset != 0) {
|
|
printf("** Cannot support non-zero offset **\n");
|
|
return -1;
|
|
}
|
|
|
|
ret = ext4fs_write(filename, buf, len, FILETYPE_REG);
|
|
if (ret) {
|
|
printf("** Error ext4fs_write() **\n");
|
|
goto fail;
|
|
}
|
|
|
|
*actwrite = len;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
*actwrite = 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ext4fs_create_link(const char *target, const char *fname)
|
|
{
|
|
return ext4fs_write(fname, target, strlen(target), FILETYPE_SYMLINK);
|
|
}
|