mirror of https://github.com/vitalif/e2fsprogs
438 lines
11 KiB
C
438 lines
11 KiB
C
/*
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* block.c --- iterate over all blocks in an inode
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*
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* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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struct block_context {
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ext2_filsys fs;
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int (*func)(ext2_filsys fs,
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blk_t *blocknr,
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int bcount,
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blk_t ref_blk,
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int ref_offset,
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void *private);
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int bcount;
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int bsize;
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int flags;
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errcode_t errcode;
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char *ind_buf;
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char *dind_buf;
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char *tind_buf;
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void *private;
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};
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static int block_iterate_ind(blk_t *ind_block, blk_t ref_block,
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int ref_offset, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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int i, flags, limit, offset;
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY))
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ret = (*ctx->func)(ctx->fs, ind_block,
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BLOCK_COUNT_IND, ref_block,
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ref_offset, ctx->private);
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if (!*ind_block || (ret & BLOCK_ABORT))
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return ret;
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if (*ind_block >= ctx->fs->super->s_blocks_count ||
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*ind_block < ctx->fs->super->s_first_data_block) {
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ctx->errcode = EXT2_ET_BAD_IND_BLOCK;
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ret |= BLOCK_ERROR;
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return ret;
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}
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ctx->errcode = io_channel_read_blk(ctx->fs->io, *ind_block,
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1, ctx->ind_buf);
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if (ctx->errcode) {
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ret |= BLOCK_ERROR;
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return ret;
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}
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limit = ctx->fs->blocksize >> 2;
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) {
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block_nr = (blk_t *) ctx->ind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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block_nr = (blk_t *) ctx->ind_buf;
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offset = 0;
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if (ctx->flags & BLOCK_FLAG_APPEND) {
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for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
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flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
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*ind_block, offset,
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ctx->private);
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changed |= flags;
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if (flags & BLOCK_ABORT) {
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ret |= BLOCK_ABORT;
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break;
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}
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offset += sizeof(blk_t);
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}
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} else {
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for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
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if (*block_nr == 0)
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continue;
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flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
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*ind_block, offset,
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ctx->private);
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changed |= flags;
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if (flags & BLOCK_ABORT) {
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ret |= BLOCK_ABORT;
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break;
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}
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offset += sizeof(blk_t);
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}
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}
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if (changed & BLOCK_CHANGED) {
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
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block_nr = (blk_t *) ctx->ind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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ctx->errcode = io_channel_write_blk(ctx->fs->io, *ind_block,
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1, ctx->ind_buf);
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if (ctx->errcode)
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ret |= BLOCK_ERROR | BLOCK_ABORT;
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}
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if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, ind_block,
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BLOCK_COUNT_IND, ref_block,
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ref_offset, ctx->private);
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return ret;
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}
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static int block_iterate_dind(blk_t *dind_block, blk_t ref_block,
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int ref_offset, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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int i, flags, limit, offset;
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY))
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ret = (*ctx->func)(ctx->fs, dind_block,
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BLOCK_COUNT_DIND, ref_block,
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ref_offset, ctx->private);
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if (!*dind_block || (ret & BLOCK_ABORT))
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return ret;
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if (*dind_block >= ctx->fs->super->s_blocks_count ||
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*dind_block < ctx->fs->super->s_first_data_block) {
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ctx->errcode = EXT2_ET_BAD_DIND_BLOCK;
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ret |= BLOCK_ERROR;
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return ret;
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}
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ctx->errcode = io_channel_read_blk(ctx->fs->io, *dind_block,
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1, ctx->dind_buf);
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if (ctx->errcode) {
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ret |= BLOCK_ERROR;
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return ret;
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}
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limit = ctx->fs->blocksize >> 2;
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) {
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block_nr = (blk_t *) ctx->dind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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block_nr = (blk_t *) ctx->dind_buf;
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offset = 0;
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if (ctx->flags & BLOCK_FLAG_APPEND) {
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for (i = 0; i < limit; i++, block_nr++) {
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flags = block_iterate_ind(block_nr,
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*dind_block, offset,
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ctx);
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changed |= flags;
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if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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break;
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}
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offset += sizeof(blk_t);
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}
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} else {
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for (i = 0; i < limit; i++, block_nr++) {
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if (*block_nr == 0)
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continue;
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flags = block_iterate_ind(block_nr,
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*dind_block, offset,
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ctx);
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changed |= flags;
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if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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break;
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}
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offset += sizeof(blk_t);
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}
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}
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if (changed & BLOCK_CHANGED) {
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
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block_nr = (blk_t *) ctx->dind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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ctx->errcode = io_channel_write_blk(ctx->fs->io, *dind_block,
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1, ctx->dind_buf);
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if (ctx->errcode)
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ret |= BLOCK_ERROR | BLOCK_ABORT;
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}
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if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, dind_block,
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BLOCK_COUNT_DIND, ref_block,
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ref_offset, ctx->private);
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return ret;
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}
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static int block_iterate_tind(blk_t *tind_block, blk_t ref_block,
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int ref_offset, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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int i, flags, limit, offset;
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY))
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ret = (*ctx->func)(ctx->fs, tind_block,
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BLOCK_COUNT_TIND, ref_block,
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ref_offset, ctx->private);
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if (!*tind_block || (ret & BLOCK_ABORT))
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return ret;
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if (*tind_block >= ctx->fs->super->s_blocks_count ||
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*tind_block < ctx->fs->super->s_first_data_block) {
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ctx->errcode = EXT2_ET_BAD_TIND_BLOCK;
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ret |= BLOCK_ERROR;
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return ret;
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}
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ctx->errcode = io_channel_read_blk(ctx->fs->io, *tind_block,
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1, ctx->tind_buf);
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if (ctx->errcode) {
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ret |= BLOCK_ERROR;
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return ret;
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}
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limit = ctx->fs->blocksize >> 2;
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) {
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block_nr = (blk_t *) ctx->tind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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block_nr = (blk_t *) ctx->tind_buf;
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offset = 0;
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if (ctx->flags & BLOCK_FLAG_APPEND) {
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for (i = 0; i < limit; i++, block_nr++) {
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flags = block_iterate_dind(block_nr,
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*tind_block,
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offset, ctx);
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changed |= flags;
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if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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break;
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}
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offset += sizeof(blk_t);
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}
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} else {
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for (i = 0; i < limit; i++, block_nr++) {
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if (*block_nr == 0)
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continue;
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flags = block_iterate_dind(block_nr,
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*tind_block,
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offset, ctx);
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changed |= flags;
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if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
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ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
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break;
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}
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offset += sizeof(blk_t);
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}
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}
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if (changed & BLOCK_CHANGED) {
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if ((ctx->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
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(ctx->fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
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block_nr = (blk_t *) ctx->tind_buf;
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for (i = 0; i < limit; i++, block_nr++)
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*block_nr = ext2fs_swab32(*block_nr);
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}
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ctx->errcode = io_channel_write_blk(ctx->fs->io, *tind_block,
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1, ctx->tind_buf);
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if (ctx->errcode)
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ret |= BLOCK_ERROR | BLOCK_ABORT;
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}
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if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
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!(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, tind_block,
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BLOCK_COUNT_TIND, ref_block,
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ref_offset, ctx->private);
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return ret;
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}
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errcode_t ext2fs_block_iterate2(ext2_filsys fs,
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ino_t ino,
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int flags,
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char *block_buf,
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int (*func)(ext2_filsys fs,
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blk_t *blocknr,
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int blockcnt,
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blk_t ref_blk,
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int ref_offset,
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void *private),
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void *private)
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{
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int i;
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int got_inode = 0;
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int ret = 0;
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blk_t blocks[EXT2_N_BLOCKS]; /* directory data blocks */
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struct ext2_inode inode;
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errcode_t retval;
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struct block_context ctx;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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ret = ext2fs_get_blocks(fs, ino, blocks);
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if (ret)
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return ret;
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ctx.fs = fs;
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ctx.func = func;
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ctx.private = private;
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ctx.flags = flags;
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ctx.bcount = 0;
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if (block_buf) {
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ctx.ind_buf = block_buf;
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} else {
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ctx.ind_buf = malloc(fs->blocksize * 3);
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if (!ctx.ind_buf)
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return ENOMEM;
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}
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ctx.dind_buf = ctx.ind_buf + fs->blocksize;
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ctx.tind_buf = ctx.dind_buf + fs->blocksize;
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/*
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* Iterate over the HURD translator block (if present)
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*/
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if ((fs->super->s_creator_os == EXT2_OS_HURD) &&
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!(flags & BLOCK_FLAG_DATA_ONLY)) {
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ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
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if (ctx.errcode)
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goto abort;
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got_inode = 1;
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if (inode.osd1.hurd1.h_i_translator) {
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ret |= (*ctx.func)(fs,
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&inode.osd1.hurd1.h_i_translator,
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BLOCK_COUNT_TRANSLATOR,
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0, 0, private);
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if (ret & BLOCK_ABORT)
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goto abort;
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}
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}
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/*
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* Iterate over normal data blocks
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*/
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for (i = 0; i < EXT2_NDIR_BLOCKS ; i++, ctx.bcount++) {
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if (blocks[i] || (flags & BLOCK_FLAG_APPEND)) {
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ret |= (*ctx.func)(fs, &blocks[i],
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ctx.bcount, 0, 0, private);
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if (ret & BLOCK_ABORT)
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goto abort;
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}
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}
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if (*(blocks + EXT2_IND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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ret |= block_iterate_ind(blocks + EXT2_IND_BLOCK,
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0, 0, &ctx);
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if (ret & BLOCK_ABORT)
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goto abort;
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}
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if (*(blocks + EXT2_DIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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ret |= block_iterate_dind(blocks + EXT2_DIND_BLOCK,
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0, 0, &ctx);
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if (ret & BLOCK_ABORT)
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goto abort;
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}
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if (*(blocks + EXT2_TIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
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ret |= block_iterate_tind(blocks + EXT2_TIND_BLOCK,
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0, 0, &ctx);
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if (ret & BLOCK_ABORT)
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goto abort;
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}
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abort:
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if (ret & BLOCK_CHANGED) {
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if (!got_inode) {
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval)
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return retval;
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}
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for (i=0; i < EXT2_N_BLOCKS; i++)
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inode.i_block[i] = blocks[i];
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retval = ext2fs_write_inode(fs, ino, &inode);
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if (retval)
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return retval;
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}
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if (!block_buf)
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free(ctx.ind_buf);
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return (ret & BLOCK_ERROR) ? ctx.errcode : 0;
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}
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struct xlate {
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int (*func)(ext2_filsys fs,
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blk_t *blocknr,
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int bcount,
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void *private);
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void *real_private;
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};
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static int xlate_func(ext2_filsys fs, blk_t *blocknr, int blockcnt,
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blk_t ref_block, int ref_offset, void *private)
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{
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struct xlate *xl = private;
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return (*xl->func)(fs, blocknr, blockcnt, xl->real_private);
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}
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errcode_t ext2fs_block_iterate(ext2_filsys fs,
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ino_t ino,
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int flags,
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char *block_buf,
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int (*func)(ext2_filsys fs,
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blk_t *blocknr,
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int blockcnt,
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void *private),
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void *private)
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{
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struct xlate xl;
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xl.real_private = private;
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xl.func = func;
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return ext2fs_block_iterate2(fs, ino, flags, block_buf,
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xlate_func, &xl);
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}
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