1997-04-26 17:21:57 +04:00
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/*
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* block.c --- iterate over all blocks in an inode
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*
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* Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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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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1997-04-26 17:58:21 +04:00
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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1997-04-26 17:34:30 +04:00
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1997-04-26 17:21:57 +04:00
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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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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, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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1997-04-26 17:58:21 +04:00
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int i, flags, limit;
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1997-04-26 17:21:57 +04:00
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE))
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ret = (*ctx->func)(ctx->fs, ind_block, -1, ctx->private);
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if (!*ind_block || (ret & BLOCK_ABORT))
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return ret;
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:58:21 +04:00
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limit = ctx->fs->blocksize >> 2;
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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if (ctx->flags & BLOCK_FLAG_APPEND) {
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for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
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1997-04-26 17:21:57 +04:00
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flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
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ctx->private);
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1997-04-26 17:58:21 +04:00
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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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}
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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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ctx->private);
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changed |= flags;
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1997-04-26 17:21:57 +04:00
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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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}
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}
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1997-04-26 17:58:21 +04:00
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if (changed & BLOCK_CHANGED) {
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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1997-04-26 17:21:57 +04:00
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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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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, ind_block, -1, 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, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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1997-04-26 17:58:21 +04:00
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int i, flags, limit;
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1997-04-26 17:21:57 +04:00
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE))
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ret = (*ctx->func)(ctx->fs, dind_block, -2, ctx->private);
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if (!*dind_block || (ret & BLOCK_ABORT))
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return ret;
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:58:21 +04:00
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limit = ctx->fs->blocksize >> 2;
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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if (ctx->flags & BLOCK_FLAG_APPEND) {
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for (i = 0; i < limit; i++, block_nr++) {
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1997-04-26 17:21:57 +04:00
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flags = block_iterate_ind(block_nr, ctx);
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1997-04-26 17:58:21 +04:00
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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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}
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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, ctx);
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changed |= flags;
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1997-04-26 17:21:57 +04:00
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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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}
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}
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1997-04-26 17:58:21 +04:00
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if (changed & BLOCK_CHANGED) {
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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1997-04-26 17:21:57 +04:00
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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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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, dind_block, -2, 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, struct block_context *ctx)
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{
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int ret = 0, changed = 0;
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1997-04-26 17:58:21 +04:00
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int i, flags, limit;
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1997-04-26 17:21:57 +04:00
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blk_t *block_nr;
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if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE))
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ret = (*ctx->func)(ctx->fs, tind_block, -3, ctx->private);
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if (!*tind_block || (ret & BLOCK_ABORT))
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return ret;
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:58:21 +04:00
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limit = ctx->fs->blocksize >> 2;
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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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, 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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}
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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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1997-04-26 17:21:57 +04:00
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flags = block_iterate_dind(block_nr, ctx);
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1997-04-26 17:58:21 +04:00
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changed |= flags;
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1997-04-26 17:21:57 +04:00
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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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}
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}
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1997-04-26 17:58:21 +04:00
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if (changed & BLOCK_CHANGED) {
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if (ctx->fs->flags & EXT2_SWAP_BYTES) {
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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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1997-04-26 17:21:57 +04:00
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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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!(ret & BLOCK_ABORT))
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ret |= (*ctx->func)(ctx->fs, tind_block, -3, ctx->private);
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return ret;
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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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int i;
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int ret = 0;
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struct block_context ctx;
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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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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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1997-04-26 17:21:57 +04:00
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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.bcount = 0;
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ctx.flags = flags;
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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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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 |= (*func)(fs, &blocks[i], ctx.bcount, 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, &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, &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, &ctx);
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abort:
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if (ret & BLOCK_CHANGED) {
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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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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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