Exemplo n.º 1
0
static errcode_t alloc_icount(ext2_filsys fs, int flags, ext2_icount_t *ret)
{
	ext2_icount_t	icount;
	errcode_t	retval;

	*ret = 0;

	retval = ext2fs_get_mem(sizeof(struct ext2_icount), &icount);
	if (retval)
		return retval;
	memset(icount, 0, sizeof(struct ext2_icount));

	retval = ext2fs_allocate_inode_bitmap(fs, 0, &icount->single);
	if (retval)
		goto errout;

	if (flags & EXT2_ICOUNT_OPT_INCREMENT) {
		retval = ext2fs_allocate_inode_bitmap(fs, 0,
						      &icount->multiple);
		if (retval)
			goto errout;
	} else
		icount->multiple = 0;

	icount->magic = EXT2_ET_MAGIC_ICOUNT;
	icount->num_inodes = fs->super->s_inodes_count;

	*ret = icount;
	return 0;

errout:
	ext2fs_free_icount(icount);
	return(retval);
}
Exemplo n.º 2
0
empty_dir_info init_empty_dir(e2fsck_t ctx)
{
	empty_dir_info	edi;
	errcode_t	retval;

	edi = malloc(sizeof(struct empty_dir_info_struct));
	if (!edi)
		return NULL;

	memset(edi, 0, sizeof(struct empty_dir_info_struct));

	retval = ext2fs_init_dblist(ctx->fs, &edi->empty_dblist);
	if (retval)
		goto errout;

	retval = ext2fs_allocate_block_bitmap(ctx->fs, _("empty dirblocks"),
					      &edi->empty_dir_blocks);
	if (retval)
		goto errout;

	retval = ext2fs_allocate_inode_bitmap(ctx->fs, _("empty dir map"),
					      &edi->dir_map);
	if (retval)
		goto errout;

	return (edi);

errout:
	free_empty_dirblock(edi);
	return NULL;
}
Exemplo n.º 3
0
errcode_t e2fsck_allocate_inode_bitmap(ext2_filsys fs, const char *descr,
				       int deftype,
				       const char *name,
				       ext2fs_inode_bitmap *ret)
{
	errcode_t	retval;
	unsigned int	save_type;

	e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
	retval = ext2fs_allocate_inode_bitmap(fs, descr, ret);
	fs->default_bitmap_type = save_type;
	return retval;
}
Exemplo n.º 4
0
static void setup_filesystem(const char *name,
			     unsigned int blocks, unsigned int inodes,
			     unsigned int type, int flags)
{
	struct ext2_super_block param;
	errcode_t retval;

	memset(&param, 0, sizeof(param));
	ext2fs_blocks_count_set(&param, blocks);
	param.s_inodes_count = inodes;

	retval = ext2fs_initialize("test fs", flags, &param,
				   test_io_manager, &test_fs);

	if (retval) {
		com_err(name, retval, "while initializing filesystem");
		return;
	}
	test_fs->default_bitmap_type = type;
	ext2fs_free_block_bitmap(test_fs->block_map);
	test_fs->block_map = 0;
	ext2fs_free_inode_bitmap(test_fs->inode_map);
	test_fs->inode_map = 0;
	retval = ext2fs_allocate_block_bitmap(test_fs, "block bitmap",
					      &test_fs->block_map);
	if (retval) {
		com_err(name, retval, "while allocating block bitmap");
		goto errout;
	}
	retval = ext2fs_allocate_inode_bitmap(test_fs, "inode bitmap",
					      &test_fs->inode_map);
	if (retval) {
		com_err(name, retval, "while allocating inode bitmap");
		goto errout;
	}
	return;

errout:
	ext2fs_close_free(&test_fs);
}
Exemplo n.º 5
0
static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t i;
	char *block_bitmap = 0, *inode_bitmap = 0;
	char *buf;
	errcode_t retval;
	int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
	int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
	int csum_flag = 0;
	unsigned int	cnt;
	blk64_t	blk;
	blk64_t	blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
	blk64_t   blk_cnt;
	ext2_ino_t ino_itr = 1;
	ext2_ino_t ino_cnt;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if ((block_nbytes > fs->blocksize) || (inode_nbytes > fs->blocksize))
		return EXT2_ET_CORRUPT_SUPERBLOCK;

	fs->write_bitmaps = ext2fs_write_bitmaps;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		csum_flag = 1;

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		return retval;
	if (do_block) {
		if (fs->block_map)
			ext2fs_free_block_bitmap(fs->block_map);
		strcpy(buf, "block bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
		if (retval)
			goto cleanup;
		retval = io_channel_alloc_buf(fs->io, 0, &block_bitmap);
		if (retval)
			goto cleanup;
	} else
		block_nbytes = 0;
	if (do_inode) {
		if (fs->inode_map)
			ext2fs_free_inode_bitmap(fs->inode_map);
		strcpy(buf, "inode bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
		if (retval)
			goto cleanup;
		retval = io_channel_alloc_buf(fs->io, 0, &inode_bitmap);
		if (retval)
			goto cleanup;
	} else
		inode_nbytes = 0;
	ext2fs_free_mem(&buf);

	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
		blk = (fs->image_header->offset_inodemap / fs->blocksize);
		ino_cnt = fs->super->s_inodes_count;
		while (inode_nbytes > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, inode_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > ino_cnt)
				cnt = ino_cnt;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += fs->blocksize << 3;
			ino_cnt -= fs->blocksize << 3;
			inode_nbytes -= fs->blocksize;
		}
		blk = (fs->image_header->offset_blockmap /
		       fs->blocksize);
		blk_cnt = (blk64_t)EXT2_CLUSTERS_PER_GROUP(fs->super) *
			fs->group_desc_count;
		while (block_nbytes > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, block_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > blk_cnt)
				cnt = blk_cnt;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
				       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += fs->blocksize << 3;
			blk_cnt -= fs->blocksize << 3;
			block_nbytes -= fs->blocksize;
		}
		goto success_cleanup;
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (block_bitmap) {
			blk = ext2fs_block_bitmap_loc(fs, i);
			if (csum_flag &&
			    ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
							       1, block_bitmap);
				if (retval) {
					retval = EXT2_ET_BLOCK_BITMAP_READ;
					goto cleanup;
				}
			} else
				memset(block_bitmap, 0, block_nbytes);
			cnt = block_nbytes << 3;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
					       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += block_nbytes << 3;
		}
		if (inode_bitmap) {
			blk = ext2fs_inode_bitmap_loc(fs, i);
			if (csum_flag &&
			    ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
							       1, inode_bitmap);
				if (retval) {
					retval = EXT2_ET_INODE_BITMAP_READ;
					goto cleanup;
				}
			} else
				memset(inode_bitmap, 0, inode_nbytes);
			cnt = inode_nbytes << 3;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += inode_nbytes << 3;
		}
	}
success_cleanup:
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	return 0;

cleanup:
	if (do_block) {
		ext2fs_free_mem(&fs->block_map);
		fs->block_map = 0;
	}
	if (do_inode) {
		ext2fs_free_mem(&fs->inode_map);
		fs->inode_map = 0;
	}
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	if (buf)
		ext2fs_free_mem(&buf);
	return retval;
}
Exemplo n.º 6
0
static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t i;
	char *block_bitmap = 0, *inode_bitmap = 0;
	char *buf;
	errcode_t retval;
	int block_nbytes = (int) EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
	int inode_nbytes = (int) EXT2_INODES_PER_GROUP(fs->super) / 8;
	int lazy_flag = 0;
	blk_t	blk;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	if (EXT2_HAS_COMPAT_FEATURE(fs->super, 
				    EXT2_FEATURE_COMPAT_LAZY_BG))
		lazy_flag = 1;

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		return retval;
	if (do_block) {
		if (fs->block_map)
			ext2fs_free_block_bitmap(fs->block_map);
		sprintf(buf, "block bitmap for %s", fs->device_name);
		retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
		if (retval)
			goto cleanup;
		block_bitmap = fs->block_map->bitmap;
	}
	if (do_inode) {
		if (fs->inode_map)
			ext2fs_free_inode_bitmap(fs->inode_map);
		sprintf(buf, "inode bitmap for %s", fs->device_name);
		retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
		if (retval)
			goto cleanup;
		inode_bitmap = fs->inode_map->bitmap;
	}
	ext2fs_free_mem(&buf);

	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
		if (inode_bitmap) {
			blk = (fs->image_header->offset_inodemap /
			       fs->blocksize);
			retval = io_channel_read_blk(fs->image_io, blk,
			     -(inode_nbytes * fs->group_desc_count),
			     inode_bitmap);
			if (retval)
				goto cleanup;
		}
		if (block_bitmap) {
			blk = (fs->image_header->offset_blockmap /
			       fs->blocksize);
			retval = io_channel_read_blk(fs->image_io, blk, 
			     -(block_nbytes * fs->group_desc_count),
			     block_bitmap);
			if (retval)
				goto cleanup;
		}
		return 0;
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (block_bitmap) {
			blk = fs->group_desc[i].bg_block_bitmap;
			if (lazy_flag && fs->group_desc[i].bg_flags &
			    EXT2_BG_BLOCK_UNINIT)
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk(fs->io, blk,
					     -block_nbytes, block_bitmap);
				if (retval) {
					retval = EXT2_ET_BLOCK_BITMAP_READ;
					goto cleanup;
				}
#ifdef EXT2_BIG_ENDIAN_BITMAPS
				if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
				      (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)))
					ext2fs_swap_bitmap(fs, block_bitmap, block_nbytes);
#endif
			} else
				memset(block_bitmap, 0xff, block_nbytes);
			block_bitmap += block_nbytes;
		}
		if (inode_bitmap) {
			blk = fs->group_desc[i].bg_inode_bitmap;
			if (lazy_flag && fs->group_desc[i].bg_flags &
			    EXT2_BG_INODE_UNINIT)
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk(fs->io, blk,
					     -inode_nbytes, inode_bitmap);
				if (retval) {
					retval = EXT2_ET_INODE_BITMAP_READ;
					goto cleanup;
				}
#ifdef EXT2_BIG_ENDIAN_BITMAPS
				if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
				      (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)))
					ext2fs_swap_bitmap(fs, inode_bitmap, inode_nbytes);
#endif
			} else
				memset(inode_bitmap, 0xff, inode_nbytes);
			inode_bitmap += inode_nbytes;
		}
	}
	return 0;
	
cleanup:
	if (do_block) {
		ext2fs_free_mem(&fs->block_map);
		fs->block_map = 0;
	}
	if (do_inode) {
		ext2fs_free_mem(&fs->inode_map);
		fs->inode_map = 0;
	}
	if (buf)
		ext2fs_free_mem(&buf);
	return retval;
}
Exemplo n.º 7
0
static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t i;
	char *block_bitmap = 0, *inode_bitmap = 0;
	char *buf;
	errcode_t retval;
	int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
	int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
	int csum_flag;
	unsigned int	cnt;
	blk64_t	blk;
	blk64_t	blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
	blk64_t   blk_cnt;
	ext2_ino_t ino_itr = 1;
	ext2_ino_t ino_cnt;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if ((block_nbytes > (int) fs->blocksize) ||
	    (inode_nbytes > (int) fs->blocksize))
		return EXT2_ET_CORRUPT_SUPERBLOCK;

	fs->write_bitmaps = ext2fs_write_bitmaps;

	csum_flag = ext2fs_has_group_desc_csum(fs);

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		return retval;
	if (do_block) {
		if (fs->block_map)
			ext2fs_free_block_bitmap(fs->block_map);
		strcpy(buf, "block bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
		if (retval)
			goto cleanup;
		retval = io_channel_alloc_buf(fs->io, 0, &block_bitmap);
		if (retval)
			goto cleanup;
	} else
		block_nbytes = 0;
	if (do_inode) {
		if (fs->inode_map)
			ext2fs_free_inode_bitmap(fs->inode_map);
		strcpy(buf, "inode bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
		if (retval)
			goto cleanup;
		retval = io_channel_alloc_buf(fs->io, 0, &inode_bitmap);
		if (retval)
			goto cleanup;
	} else
		inode_nbytes = 0;
	ext2fs_free_mem(&buf);

	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
		blk = (ext2fs_le32_to_cpu(fs->image_header->offset_inodemap) / fs->blocksize);
		ino_cnt = fs->super->s_inodes_count;
		while (inode_bitmap && ino_cnt > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, inode_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > ino_cnt)
				cnt = ino_cnt;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += cnt;
			ino_cnt -= cnt;
		}
		blk = (ext2fs_le32_to_cpu(fs->image_header->offset_blockmap) /
		       fs->blocksize);
		blk_cnt = EXT2_GROUPS_TO_CLUSTERS(fs->super,
						  fs->group_desc_count);
		while (block_bitmap && blk_cnt > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, block_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > blk_cnt)
				cnt = blk_cnt;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
				       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += cnt;
			blk_cnt -= cnt;
		}
		goto success_cleanup;
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (block_bitmap) {
			blk = ext2fs_block_bitmap_loc(fs, i);
			if (csum_flag &&
			    ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
							       1, block_bitmap);
				if (retval) {
					retval = EXT2_ET_BLOCK_BITMAP_READ;
					goto cleanup;
				}
				/* verify block bitmap checksum */
				if (!(fs->flags &
				      EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
				    !ext2fs_block_bitmap_csum_verify(fs, i,
						block_bitmap, block_nbytes)) {
					retval =
					EXT2_ET_BLOCK_BITMAP_CSUM_INVALID;
					goto cleanup;
				}
			} else
				memset(block_bitmap, 0, block_nbytes);
			cnt = block_nbytes << 3;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
					       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += block_nbytes << 3;
		}
		if (inode_bitmap) {
			blk = ext2fs_inode_bitmap_loc(fs, i);
			if (csum_flag &&
			    ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
							       1, inode_bitmap);
				if (retval) {
					retval = EXT2_ET_INODE_BITMAP_READ;
					goto cleanup;
				}

				/* verify inode bitmap checksum */
				if (!(fs->flags &
				      EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
				    !ext2fs_inode_bitmap_csum_verify(fs, i,
						inode_bitmap, inode_nbytes)) {
					retval =
					EXT2_ET_INODE_BITMAP_CSUM_INVALID;
					goto cleanup;
				}
			} else
				memset(inode_bitmap, 0, inode_nbytes);
			cnt = inode_nbytes << 3;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += inode_nbytes << 3;
		}
	}

	/* Mark group blocks for any BLOCK_UNINIT groups */
	if (do_block) {
		retval = mark_uninit_bg_group_blocks(fs);
		if (retval)
			goto cleanup;
	}

success_cleanup:
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	return 0;

cleanup:
	if (do_block) {
		ext2fs_free_mem(&fs->block_map);
		fs->block_map = 0;
	}
	if (do_inode) {
		ext2fs_free_mem(&fs->inode_map);
		fs->inode_map = 0;
	}
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	if (buf)
		ext2fs_free_mem(&buf);
	return retval;
}
Exemplo n.º 8
0
void e2fsck_pass3(e2fsck_t ctx)
{
    ext2_filsys fs = ctx->fs;
    struct dir_info_iter *iter;
#ifdef RESOURCE_TRACK
    struct resource_track	rtrack;
#endif
    struct problem_context	pctx;
    struct dir_info	*dir;
    unsigned long maxdirs, count;

    init_resource_track(&rtrack, ctx->fs->io);
    clear_problem_context(&pctx);

#ifdef MTRACE
    mtrace_print("Pass 3");
#endif

    if (!(ctx->options & E2F_OPT_PREEN))
        fix_problem(ctx, PR_3_PASS_HEADER, &pctx);

    /*
     * Allocate some bitmaps to do loop detection.
     */
    pctx.errcode = ext2fs_allocate_inode_bitmap(fs, _("inode done bitmap"),
                   &inode_done_map);
    if (pctx.errcode) {
        pctx.num = 2;
        fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx);
        ctx->flags |= E2F_FLAG_ABORT;
        goto abort_exit;
    }
    print_resource_track(ctx, _("Peak memory"), &ctx->global_rtrack, NULL);

    check_root(ctx);
    if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
        goto abort_exit;

    ext2fs_mark_inode_bitmap2(inode_done_map, EXT2_ROOT_INO);

    maxdirs = e2fsck_get_num_dirinfo(ctx);
    count = 1;

    if (ctx->progress)
        if ((ctx->progress)(ctx, 3, 0, maxdirs))
            goto abort_exit;

    iter = e2fsck_dir_info_iter_begin(ctx);
    while ((dir = e2fsck_dir_info_iter(ctx, iter)) != 0) {
        if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
            goto abort_exit;
        if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs))
            goto abort_exit;
        if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dir->ino))
            if (check_directory(ctx, dir->ino, &pctx))
                goto abort_exit;
    }
    e2fsck_dir_info_iter_end(ctx, iter);

    /*
     * Force the creation of /lost+found if not present
     */
    if ((ctx->flags & E2F_OPT_READONLY) == 0)
        e2fsck_get_lost_and_found(ctx, 1);

    /*
     * If there are any directories that need to be indexed or
     * optimized, do it here.
     */
    e2fsck_rehash_directories(ctx);

abort_exit:
    e2fsck_free_dir_info(ctx);
    if (inode_loop_detect) {
        ext2fs_free_inode_bitmap(inode_loop_detect);
        inode_loop_detect = 0;
    }
    if (inode_done_map) {
        ext2fs_free_inode_bitmap(inode_done_map);
        inode_done_map = 0;
    }

    print_resource_track(ctx, _("Pass 3"), &rtrack, ctx->fs->io);
}
Exemplo n.º 9
0
/*
 * This subroutine is responsible for making sure that a particular
 * directory is connected to the root; if it isn't we trace it up as
 * far as we can go, and then offer to connect the resulting parent to
 * the lost+found.  We have to do loop detection; if we ever discover
 * a loop, we treat that as a disconnected directory and offer to
 * reparent it to lost+found.
 *
 * However, loop detection is expensive, because for very large
 * filesystems, the inode_loop_detect bitmap is huge, and clearing it
 * is non-trivial.  Loops in filesystems are also a rare error case,
 * and we shouldn't optimize for error cases.  So we try two passes of
 * the algorithm.  The first time, we ignore loop detection and merely
 * increment a counter; if the counter exceeds some extreme threshold,
 * then we try again with the loop detection bitmap enabled.
 */
static int check_directory(e2fsck_t ctx, ext2_ino_t dir,
                           struct problem_context *pctx)
{
    ext2_filsys 	fs = ctx->fs;
    ext2_ino_t	ino = dir, parent;
    int		loop_pass = 0, parent_count = 0;

    while (1) {
        /*
         * Mark this inode as being "done"; by the time we
         * return from this function, the inode we either be
         * verified as being connected to the directory tree,
         * or we will have offered to reconnect this to
         * lost+found.
         *
         * If it was marked done already, then we've reached a
         * parent we've already checked.
         */
        if (ext2fs_mark_inode_bitmap2(inode_done_map, ino))
            break;

        if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) {
            fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
            return 0;
        }

        /*
         * If this directory doesn't have a parent, or we've
         * seen the parent once already, then offer to
         * reparent it to lost+found
         */
        if (!parent ||
                (loop_pass &&
                 (ext2fs_test_inode_bitmap2(inode_loop_detect,
                                            parent)))) {
            pctx->ino = ino;
            if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) {
                if (e2fsck_reconnect_file(ctx, pctx->ino))
                    ext2fs_unmark_valid(fs);
                else {
                    fix_dotdot(ctx, pctx->ino,
                               ctx->lost_and_found);
                    parent = ctx->lost_and_found;
                }
            }
            break;
        }
        ino = parent;
        if (loop_pass) {
            ext2fs_mark_inode_bitmap2(inode_loop_detect, ino);
        } else if (parent_count++ > 2048) {
            /*
             * If we've run into a path depth that's
             * greater than 2048, try again with the inode
             * loop bitmap turned on and start from the
             * top.
             */
            loop_pass = 1;
            if (inode_loop_detect)
                ext2fs_clear_inode_bitmap(inode_loop_detect);
            else {
                pctx->errcode = ext2fs_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), &inode_loop_detect);
                if (pctx->errcode) {
                    pctx->num = 1;
                    fix_problem(ctx,
                                PR_3_ALLOCATE_IBITMAP_ERROR, pctx);
                    ctx->flags |= E2F_FLAG_ABORT;
                    return -1;
                }
            }
            ino = dir;
        }
    }

    /*
     * Make sure that .. and the parent directory are the same;
     * offer to fix it if not.
     */
    pctx->ino = dir;
    if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) ||
            e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) {
        fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
        return 0;
    }
    if (pctx->ino2 != pctx->dir) {
        if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx))
            fix_dotdot(ctx, dir, pctx->dir);
    }
    return 0;
}
Exemplo n.º 10
0
/*
 * Setup the variables for doing the inode scan test.
 */
static void setup(void)
{
	errcode_t	retval;
	int		i;
	struct ext2_super_block param;

	initialize_ext2_error_table();

	memset(&param, 0, sizeof(param));
	param.s_blocks_count = 12000;


	test_io_cb_read_blk = test_read_blk;

	retval = ext2fs_initialize("test fs", 0, &param,
				   test_io_manager, &test_fs);
	if (retval) {
		com_err("setup", retval,
			"While initializing filesystem");
		exit(1);
	}
	retval = ext2fs_allocate_tables(test_fs);
	if (retval) {
		com_err("setup", retval,
			"While allocating tables for test filesystem");
		exit(1);
	}
	retval = ext2fs_allocate_block_bitmap(test_fs, "bad block map",
					      &bad_block_map);
	if (retval) {
		com_err("setup", retval,
			"While allocating bad_block bitmap");
		exit(1);
	}
	retval = ext2fs_allocate_block_bitmap(test_fs, "touched map",
					      &touched_map);
	if (retval) {
		com_err("setup", retval,
			"While allocating touched block bitmap");
		exit(1);
	}
	retval = ext2fs_allocate_inode_bitmap(test_fs, "bad inode map",
					      &bad_inode_map);
	if (retval) {
		com_err("setup", retval,
			"While allocating bad inode bitmap");
		exit(1);
	}

	retval = ext2fs_badblocks_list_create(&test_badblocks, 5);
	if (retval) {
		com_err("setup", retval, "while creating badblocks list");
		exit(1);
	}
	for (i=0; test_vec[i]; i++) {
		retval = ext2fs_badblocks_list_add(test_badblocks, test_vec[i]);
		if (retval) {
			com_err("setup", retval,
				"while adding test vector %d", i);
			exit(1);
		}
		ext2fs_mark_block_bitmap(bad_block_map, test_vec[i]);
	}
	test_fs->badblocks = test_badblocks;
}
Exemplo n.º 11
0
errcode_t ext2fs_initialize(const char *name, int flags,
                            struct ext2_super_block *param,
                            io_manager manager, ext2_filsys *ret_fs)
{
    ext2_filsys	fs;
    errcode_t	retval;
    struct ext2_super_block *super;
    int		frags_per_block;
    unsigned int	rem;
    unsigned int	overhead = 0;
    unsigned int	ipg;
    dgrp_t		i;
    blk_t		numblocks;
    int		rsv_gdt;
    int		io_flags;
    char		*buf;
    char		c;

    if (!param || !param->s_blocks_count)
        return EXT2_ET_INVALID_ARGUMENT;

    retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
    if (retval)
        return retval;

    memset(fs, 0, sizeof(struct struct_ext2_filsys));
    fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
    fs->flags = flags | EXT2_FLAG_RW;
    fs->umask = 022;
#ifdef WORDS_BIGENDIAN
    fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
    io_flags = IO_FLAG_RW;
    if (flags & EXT2_FLAG_EXCLUSIVE)
        io_flags |= IO_FLAG_EXCLUSIVE;
    retval = manager->open(name, io_flags, &fs->io);
    if (retval)
        goto cleanup;
    fs->image_io = fs->io;
    fs->io->app_data = fs;
    retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
    if (retval)
        goto cleanup;

    strcpy(fs->device_name, name);
    retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
    if (retval)
        goto cleanup;
    fs->super = super;

    memset(super, 0, SUPERBLOCK_SIZE);

#define set_field(field, default) (super->field = param->field ? \
				   param->field : (default))

    super->s_magic = EXT2_SUPER_MAGIC;
    super->s_state = EXT2_VALID_FS;

    set_field(s_log_block_size, 0);	/* default blocksize: 1024 bytes */
    set_field(s_log_frag_size, 0); /* default fragsize: 1024 bytes */
    set_field(s_first_data_block, super->s_log_block_size ? 0 : 1);
    set_field(s_max_mnt_count, EXT2_DFL_MAX_MNT_COUNT);
    set_field(s_errors, EXT2_ERRORS_DEFAULT);
    set_field(s_feature_compat, 0);
    set_field(s_feature_incompat, 0);
    set_field(s_feature_ro_compat, 0);
    set_field(s_first_meta_bg, 0);
    if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
        retval = EXT2_ET_UNSUPP_FEATURE;
        goto cleanup;
    }
    if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
        retval = EXT2_ET_RO_UNSUPP_FEATURE;
        goto cleanup;
    }

    set_field(s_rev_level, EXT2_GOOD_OLD_REV);
    if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
        set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
        set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
    }

    set_field(s_checkinterval, EXT2_DFL_CHECKINTERVAL);
    super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);

    super->s_creator_os = CREATOR_OS;

    fs->blocksize = EXT2_BLOCK_SIZE(super);
    fs->fragsize = EXT2_FRAG_SIZE(super);
    frags_per_block = fs->blocksize / fs->fragsize;

    /* default: (fs->blocksize*8) blocks/group, up to 2^16 (GDT limit) */
    set_field(s_blocks_per_group, fs->blocksize * 8);
    if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
        super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
    super->s_frags_per_group = super->s_blocks_per_group * frags_per_block;

    super->s_blocks_count = param->s_blocks_count;
    super->s_r_blocks_count = param->s_r_blocks_count;
    if (super->s_r_blocks_count >= param->s_blocks_count) {
        retval = EXT2_ET_INVALID_ARGUMENT;
        goto cleanup;
    }

    /*
     * If we're creating an external journal device, we don't need
     * to bother with the rest.
     */
    if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
        fs->group_desc_count = 0;
        ext2fs_mark_super_dirty(fs);
        *ret_fs = fs;
        return 0;
    }

retry:
    fs->group_desc_count = ext2fs_div_ceil(super->s_blocks_count -
                                           super->s_first_data_block,
                                           EXT2_BLOCKS_PER_GROUP(super));
    if (fs->group_desc_count == 0) {
        retval = EXT2_ET_TOOSMALL;
        goto cleanup;
    }
    fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
                                      EXT2_DESC_PER_BLOCK(super));

    i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
    set_field(s_inodes_count, super->s_blocks_count / i);

    /*
     * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
     * that we have enough inodes for the filesystem(!)
     */
    if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
        super->s_inodes_count = EXT2_FIRST_INODE(super)+1;

    /*
     * There should be at least as many inodes as the user
     * requested.  Figure out how many inodes per group that
     * should be.  But make sure that we don't allocate more than
     * one bitmap's worth of inodes each group.
     */
    ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
    if (ipg > fs->blocksize * 8) {
        if (super->s_blocks_per_group >= 256) {
            /* Try again with slightly different parameters */
            super->s_blocks_per_group -= 8;
            super->s_blocks_count = param->s_blocks_count;
            super->s_frags_per_group = super->s_blocks_per_group *
                                       frags_per_block;
            goto retry;
        } else
            return EXT2_ET_TOO_MANY_INODES;
    }

    if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
        ipg = EXT2_MAX_INODES_PER_GROUP(super);

ipg_retry:
    super->s_inodes_per_group = ipg;

    /*
     * Make sure the number of inodes per group completely fills
     * the inode table blocks in the descriptor.  If not, add some
     * additional inodes/group.  Waste not, want not...
     */
    fs->inode_blocks_per_group = (((super->s_inodes_per_group *
                                    EXT2_INODE_SIZE(super)) +
                                   EXT2_BLOCK_SIZE(super) - 1) /
                                  EXT2_BLOCK_SIZE(super));
    super->s_inodes_per_group = ((fs->inode_blocks_per_group *
                                  EXT2_BLOCK_SIZE(super)) /
                                 EXT2_INODE_SIZE(super));
    /*
     * Finally, make sure the number of inodes per group is a
     * multiple of 8.  This is needed to simplify the bitmap
     * splicing code.
     */
    super->s_inodes_per_group &= ~7;
    fs->inode_blocks_per_group = (((super->s_inodes_per_group *
                                    EXT2_INODE_SIZE(super)) +
                                   EXT2_BLOCK_SIZE(super) - 1) /
                                  EXT2_BLOCK_SIZE(super));

    /*
     * adjust inode count to reflect the adjusted inodes_per_group
     */
    if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
        ipg--;
        goto ipg_retry;
    }
    super->s_inodes_count = super->s_inodes_per_group *
                            fs->group_desc_count;
    super->s_free_inodes_count = super->s_inodes_count;

    /*
     * check the number of reserved group descriptor table blocks
     */
    if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)
        rsv_gdt = calc_reserved_gdt_blocks(fs);
    else
        rsv_gdt = 0;
    set_field(s_reserved_gdt_blocks, rsv_gdt);
    if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
        retval = EXT2_ET_RES_GDT_BLOCKS;
        goto cleanup;
    }

    /*
     * Overhead is the number of bookkeeping blocks per group.  It
     * includes the superblock backup, the group descriptor
     * backups, the inode bitmap, the block bitmap, and the inode
     * table.
     */

    overhead = (int) (2 + fs->inode_blocks_per_group);

    if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
        overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;

    /* This can only happen if the user requested too many inodes */
    if (overhead > super->s_blocks_per_group)
        return EXT2_ET_TOO_MANY_INODES;

    /*
     * See if the last group is big enough to support the
     * necessary data structures.  If not, we need to get rid of
     * it.
     */
    rem = ((super->s_blocks_count - super->s_first_data_block) %
           super->s_blocks_per_group);
    if ((fs->group_desc_count == 1) && rem && (rem < overhead))
        return EXT2_ET_TOOSMALL;
    if (rem && (rem < overhead+50)) {
        super->s_blocks_count -= rem;
        goto retry;
    }

    /*
     * At this point we know how big the filesystem will be.  So
     * we can do any and all allocations that depend on the block
     * count.
     */

    retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
    if (retval)
        goto cleanup;

    sprintf(buf, "block bitmap for %s", fs->device_name);
    retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
    if (retval)
        goto cleanup;

    sprintf(buf, "inode bitmap for %s", fs->device_name);
    retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
    if (retval)
        goto cleanup;

    ext2fs_free_mem(&buf);

    retval = ext2fs_get_mem((size_t) fs->desc_blocks * fs->blocksize,
                            &fs->group_desc);
    if (retval)
        goto cleanup;

    memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);

    /*
     * Reserve the superblock and group descriptors for each
     * group, and fill in the correct group statistics for group.
     * Note that although the block bitmap, inode bitmap, and
     * inode table have not been allocated (and in fact won't be
     * by this routine), they are accounted for nevertheless.
     */
    super->s_free_blocks_count = 0;
    for (i = 0; i < fs->group_desc_count; i++) {
        numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);

        super->s_free_blocks_count += numblocks;
        fs->group_desc[i].bg_free_blocks_count = numblocks;
        fs->group_desc[i].bg_free_inodes_count =
            fs->super->s_inodes_per_group;
        fs->group_desc[i].bg_used_dirs_count = 0;
    }

    c = (char) 255;
    if (((int) c) == -1) {
        super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
    } else {
        super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
    }

    ext2fs_mark_super_dirty(fs);
    ext2fs_mark_bb_dirty(fs);
    ext2fs_mark_ib_dirty(fs);

    io_channel_set_blksize(fs->io, fs->blocksize);

    *ret_fs = fs;
    return 0;
cleanup:
    ext2fs_free(fs);
    return retval;
}
Exemplo n.º 12
0
errcode_t ext2fs_initialize(const char *name, int flags,
			    struct ext2_super_block *param,
			    io_manager manager, ext2_filsys *ret_fs)
{
	ext2_filsys	fs;
	errcode_t	retval;
	struct ext2_super_block *super;
	unsigned int	rem;
	unsigned int	overhead = 0;
	unsigned int	ipg;
	dgrp_t		i;
	blk64_t		free_blocks;
	blk_t		numblocks;
	int		rsv_gdt;
	int		csum_flag;
	int		bigalloc_flag;
	int		io_flags;
	unsigned	reserved_inos;
	char		*buf = 0;
	char		c;
	double		reserved_ratio;

	if (!param || !ext2fs_blocks_count(param))
		return EXT2_ET_INVALID_ARGUMENT;

	retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
	if (retval)
		return retval;

	memset(fs, 0, sizeof(struct struct_ext2_filsys));
	fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
	fs->flags = flags | EXT2_FLAG_RW;
	fs->umask = 022;
	fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
#ifdef WORDS_BIGENDIAN
	fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
	io_flags = IO_FLAG_RW;
	if (flags & EXT2_FLAG_EXCLUSIVE)
		io_flags |= IO_FLAG_EXCLUSIVE;
	if (flags & EXT2_FLAG_DIRECT_IO)
		io_flags |= IO_FLAG_DIRECT_IO;
	retval = manager->open(name, io_flags, &fs->io);
	if (retval)
		goto cleanup;
	fs->image_io = fs->io;
	fs->io->app_data = fs;
	retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
	if (retval)
		goto cleanup;

	strcpy(fs->device_name, name);
	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
	if (retval)
		goto cleanup;
	fs->super = super;

	memset(super, 0, SUPERBLOCK_SIZE);

#define set_field(field, default) (super->field = param->field ? \
				   param->field : (default))
#define assign_field(field)	(super->field = param->field)

	super->s_magic = EXT2_SUPER_MAGIC;
	super->s_state = EXT2_VALID_FS;

	bigalloc_flag = EXT2_HAS_RO_COMPAT_FEATURE(param,
				   EXT4_FEATURE_RO_COMPAT_BIGALLOC);

	assign_field(s_log_block_size);

	if (bigalloc_flag) {
		set_field(s_log_cluster_size, super->s_log_block_size+4);
		if (super->s_log_block_size > super->s_log_cluster_size) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
	} else
		super->s_log_cluster_size = super->s_log_block_size;

	set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
	set_field(s_max_mnt_count, 0);
	set_field(s_errors, EXT2_ERRORS_DEFAULT);
	set_field(s_feature_compat, 0);
	set_field(s_feature_incompat, 0);
	set_field(s_feature_ro_compat, 0);
	set_field(s_default_mount_opts, 0);
	set_field(s_first_meta_bg, 0);
	set_field(s_raid_stride, 0);		/* default stride size: 0 */
	set_field(s_raid_stripe_width, 0);	/* default stripe width: 0 */
	set_field(s_log_groups_per_flex, 0);
	set_field(s_flags, 0);
	assign_field(s_backup_bgs[0]);
	assign_field(s_backup_bgs[1]);
	if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
		retval = EXT2_ET_UNSUPP_FEATURE;
		goto cleanup;
	}
	if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
		retval = EXT2_ET_RO_UNSUPP_FEATURE;
		goto cleanup;
	}

	set_field(s_rev_level, EXT2_GOOD_OLD_REV);
	if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
		set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
		set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
		if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
			int extra_isize = sizeof(struct ext2_inode_large) -
				EXT2_GOOD_OLD_INODE_SIZE;
			set_field(s_min_extra_isize, extra_isize);
			set_field(s_want_extra_isize, extra_isize);
		}
	} else {
		super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
		super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
	}

	set_field(s_checkinterval, 0);
	super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);

	super->s_creator_os = CREATOR_OS;

	fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
	fs->cluster_ratio_bits = super->s_log_cluster_size -
		super->s_log_block_size;

	if (bigalloc_flag) {
		unsigned long long bpg;

		if (param->s_blocks_per_group &&
		    param->s_clusters_per_group &&
		    ((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
		     param->s_blocks_per_group)) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
		if (param->s_clusters_per_group)
			assign_field(s_clusters_per_group);
		else if (param->s_blocks_per_group)
			super->s_clusters_per_group = 
				param->s_blocks_per_group /
				EXT2FS_CLUSTER_RATIO(fs);
		else if (super->s_log_cluster_size + 15 < 32)
			super->s_clusters_per_group = fs->blocksize * 8;
		else
			super->s_clusters_per_group = (fs->blocksize - 1) * 8;
		if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
			super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
		bpg = EXT2FS_C2B(fs,
			(unsigned long long) super->s_clusters_per_group);
		if (bpg >= (((unsigned long long) 1) << 32)) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
		super->s_blocks_per_group = bpg;
	} else {
		set_field(s_blocks_per_group, fs->blocksize * 8);
		if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
			super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
		super->s_clusters_per_group = super->s_blocks_per_group;
	}

	ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
				~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
	ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
	if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
		retval = EXT2_ET_INVALID_ARGUMENT;
		goto cleanup;
	}

	set_field(s_mmp_update_interval, 0);

	/*
	 * If we're creating an external journal device, we don't need
	 * to bother with the rest.
	 */
	if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
		fs->group_desc_count = 0;
		ext2fs_mark_super_dirty(fs);
		*ret_fs = fs;
		return 0;
	}

retry:
	fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
		ext2fs_blocks_count(super) - super->s_first_data_block,
		EXT2_BLOCKS_PER_GROUP(super));
	if (fs->group_desc_count == 0) {
		retval = EXT2_ET_TOOSMALL;
		goto cleanup;
	}

	set_field(s_desc_size,
		  super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
		  EXT2_MIN_DESC_SIZE_64BIT : 0);

	fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
					  EXT2_DESC_PER_BLOCK(super));

	i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;

	if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT &&
	    (ext2fs_blocks_count(super) / i) > (1ULL << 32))
		set_field(s_inodes_count, ~0U);
	else
		set_field(s_inodes_count, ext2fs_blocks_count(super) / i);

	/*
	 * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
	 * that we have enough inodes for the filesystem(!)
	 */
	if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
		super->s_inodes_count = EXT2_FIRST_INODE(super)+1;

	/*
	 * There should be at least as many inodes as the user
	 * requested.  Figure out how many inodes per group that
	 * should be.  But make sure that we don't allocate more than
	 * one bitmap's worth of inodes each group.
	 */
	ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
	if (ipg > fs->blocksize * 8) {
		if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
			/* Try again with slightly different parameters */
			super->s_blocks_per_group -= 8;
			ext2fs_blocks_count_set(super,
						ext2fs_blocks_count(param));
			super->s_clusters_per_group = super->s_blocks_per_group;
			goto retry;
		} else {
			retval = EXT2_ET_TOO_MANY_INODES;
			goto cleanup;
		}
	}

	if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
		ipg = EXT2_MAX_INODES_PER_GROUP(super);

ipg_retry:
	super->s_inodes_per_group = ipg;

	/*
	 * Make sure the number of inodes per group completely fills
	 * the inode table blocks in the descriptor.  If not, add some
	 * additional inodes/group.  Waste not, want not...
	 */
	fs->inode_blocks_per_group = (((super->s_inodes_per_group *
					EXT2_INODE_SIZE(super)) +
				       EXT2_BLOCK_SIZE(super) - 1) /
				      EXT2_BLOCK_SIZE(super));
	super->s_inodes_per_group = ((fs->inode_blocks_per_group *
				      EXT2_BLOCK_SIZE(super)) /
				     EXT2_INODE_SIZE(super));
	/*
	 * Finally, make sure the number of inodes per group is a
	 * multiple of 8.  This is needed to simplify the bitmap
	 * splicing code.
	 */
	if (super->s_inodes_per_group < 8)
		super->s_inodes_per_group = 8;
	super->s_inodes_per_group &= ~7;
	fs->inode_blocks_per_group = (((super->s_inodes_per_group *
					EXT2_INODE_SIZE(super)) +
				       EXT2_BLOCK_SIZE(super) - 1) /
				      EXT2_BLOCK_SIZE(super));

	/*
	 * adjust inode count to reflect the adjusted inodes_per_group
	 */
	if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
		ipg--;
		goto ipg_retry;
	}
	super->s_inodes_count = super->s_inodes_per_group *
		fs->group_desc_count;
	super->s_free_inodes_count = super->s_inodes_count;

	/*
	 * check the number of reserved group descriptor table blocks
	 */
	if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)
		rsv_gdt = calc_reserved_gdt_blocks(fs);
	else
		rsv_gdt = 0;
	set_field(s_reserved_gdt_blocks, rsv_gdt);
	if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
		retval = EXT2_ET_RES_GDT_BLOCKS;
		goto cleanup;
	}

	/*
	 * Calculate the maximum number of bookkeeping blocks per
	 * group.  It includes the superblock, the block group
	 * descriptors, the block bitmap, the inode bitmap, the inode
	 * table, and the reserved gdt blocks.
	 */
	overhead = (int) (3 + fs->inode_blocks_per_group +
			  fs->desc_blocks + super->s_reserved_gdt_blocks);

	/* This can only happen if the user requested too many inodes */
	if (overhead > super->s_blocks_per_group) {
		retval = EXT2_ET_TOO_MANY_INODES;
		goto cleanup;
	}

	/*
	 * See if the last group is big enough to support the
	 * necessary data structures.  If not, we need to get rid of
	 * it.  We need to recalculate the overhead for the last block
	 * group, since it might or might not have a superblock
	 * backup.
	 */
	overhead = (int) (2 + fs->inode_blocks_per_group);
	if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
		overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
	rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
	       super->s_blocks_per_group);
	if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
		retval = EXT2_ET_TOOSMALL;
		goto cleanup;
	}
	if (rem && (rem < overhead+50)) {
		ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
					rem);
		/*
		 * If blocks count is changed, we need to recalculate
		 * reserved blocks count not to exceed 50%.
		 */
		reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
			ext2fs_blocks_count(param);
		ext2fs_r_blocks_count_set(super, reserved_ratio *
			ext2fs_blocks_count(super) / 100.0);

		goto retry;
	}

	/*
	 * At this point we know how big the filesystem will be.  So
	 * we can do any and all allocations that depend on the block
	 * count.
	 */

	/* Set up the locations of the backup superblocks */
	if (super->s_feature_compat & EXT4_FEATURE_COMPAT_SPARSE_SUPER2) {
		if (super->s_backup_bgs[0] >= fs->group_desc_count)
			super->s_backup_bgs[0] = fs->group_desc_count - 1;
		if (super->s_backup_bgs[1] >= fs->group_desc_count)
			super->s_backup_bgs[1] = fs->group_desc_count - 1;
		if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
			super->s_backup_bgs[1] = 0;
		if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
			__u32 t = super->s_backup_bgs[0];
			super->s_backup_bgs[0] = super->s_backup_bgs[1];
			super->s_backup_bgs[1] = t;
		}
	}

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		goto cleanup;

	strcpy(buf, "block bitmap for ");
	strcat(buf, fs->device_name);
	retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
	if (retval)
		goto cleanup;

	strcpy(buf, "inode bitmap for ");
	strcat(buf, fs->device_name);
	retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
	if (retval)
		goto cleanup;

	ext2fs_free_mem(&buf);

	retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
				&fs->group_desc);
	if (retval)
		goto cleanup;

	memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);

	/*
	 * Reserve the superblock and group descriptors for each
	 * group, and fill in the correct group statistics for group.
	 * Note that although the block bitmap, inode bitmap, and
	 * inode table have not been allocated (and in fact won't be
	 * by this routine), they are accounted for nevertheless.
	 *
	 * If FLEX_BG meta-data grouping is used, only account for the
	 * superblock and group descriptors (the inode tables and
	 * bitmaps will be accounted for when allocated).
	 */
	free_blocks = 0;
	csum_flag = ext2fs_has_group_desc_csum(fs);
	reserved_inos = super->s_first_ino;
	for (i = 0; i < fs->group_desc_count; i++) {
		/*
		 * Don't set the BLOCK_UNINIT group for the last group
		 * because the block bitmap needs to be padded.
		 */
		if (csum_flag) {
			if (i != fs->group_desc_count - 1)
				ext2fs_bg_flags_set(fs, i,
						    EXT2_BG_BLOCK_UNINIT);
			ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
			numblocks = super->s_inodes_per_group;
			if (reserved_inos) {
				if (numblocks > reserved_inos) {
					numblocks -= reserved_inos;
					reserved_inos = 0;
				} else {
					reserved_inos -= numblocks;
					numblocks = 0;
				}
			}
			ext2fs_bg_itable_unused_set(fs, i, numblocks);
		}
		numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
		if (fs->super->s_log_groups_per_flex)
			numblocks += 2 + fs->inode_blocks_per_group;

		free_blocks += numblocks;
		ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
		ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
		ext2fs_bg_used_dirs_count_set(fs, i, 0);
		ext2fs_group_desc_csum_set(fs, i);
	}
	free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
	ext2fs_free_blocks_count_set(super, free_blocks);

	c = (char) 255;
	if (((int) c) == -1) {
		super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
	} else {
		super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
	}

	ext2fs_mark_super_dirty(fs);
	ext2fs_mark_bb_dirty(fs);
	ext2fs_mark_ib_dirty(fs);

	io_channel_set_blksize(fs->io, fs->blocksize);

	*ret_fs = fs;
	return 0;
cleanup:
	free(buf);
	ext2fs_free(fs);
	return retval;
}
Exemplo n.º 13
0
errcode_t ext2fs_create_icount2(ext2_filsys fs, int flags, unsigned int size,
				ext2_icount_t hint, ext2_icount_t *ret)
{
	ext2_icount_t	icount;
	errcode_t	retval;
	size_t		bytes;
	ext2_ino_t	i;

	if (hint) {
		EXT2_CHECK_MAGIC(hint, EXT2_ET_MAGIC_ICOUNT);
		if (hint->size > size)
			size = (size_t) hint->size;
	}
	
	retval = ext2fs_get_mem(sizeof(struct ext2_icount), &icount);
	if (retval)
		return retval;
	memset(icount, 0, sizeof(struct ext2_icount));

	retval = ext2fs_allocate_inode_bitmap(fs, 0, 
					      &icount->single);
	if (retval)
		goto errout;

	if (flags & EXT2_ICOUNT_OPT_INCREMENT) {
		retval = ext2fs_allocate_inode_bitmap(fs, 0, 
						      &icount->multiple);
		if (retval)
			goto errout;
	} else
		icount->multiple = 0;

	if (size) {
		icount->size = size;
	} else {
		/*
		 * Figure out how many special case inode counts we will
		 * have.  We know we will need one for each directory;
		 * we also need to reserve some extra room for file links
		 */
		retval = ext2fs_get_num_dirs(fs, &icount->size);
		if (retval)
			goto errout;
		icount->size += fs->super->s_inodes_count / 50;
	}
	
	bytes = (size_t) (icount->size * sizeof(struct ext2_icount_el));
#if 0
	printf("Icount allocated %d entries, %d bytes.\n",
	       icount->size, bytes);
#endif
	retval = ext2fs_get_mem(bytes, &icount->list);
	if (retval)
		goto errout;
	memset(icount->list, 0, bytes);

	icount->magic = EXT2_ET_MAGIC_ICOUNT;
	icount->count = 0;
	icount->cursor = 0;
	icount->num_inodes = fs->super->s_inodes_count;

	/*
	 * Populate the sorted list with those entries which were
	 * found in the hint icount (since those are ones which will
	 * likely need to be in the sorted list this time around).
	 */
	if (hint) {
		for (i=0; i < hint->count; i++)
			icount->list[i].ino = hint->list[i].ino;
		icount->count = hint->count;
	}

	*ret = icount;
	return 0;

errout:
	ext2fs_free_icount(icount);
	return(retval);
}