errcode_t ext2fs_zero_blocks(ext2_filsys fs, blk_t blk, int num,
			     blk_t *ret_blk, int *ret_count)
{
	blk64_t ret_blk2;
	errcode_t retval;

	retval = ext2fs_zero_blocks2(fs, blk, num, &ret_blk2, ret_count);
	if (retval)
		*ret_blk = (blk_t) ret_blk2;
	return retval;
}
Exemple #2
0
/*
 * This function zeros out the allocated block, and updates all of the
 * appropriate filesystem records.
 */
errcode_t ext2fs_alloc_block2(ext2_filsys fs, blk64_t goal,
			     char *block_buf, blk64_t *ret)
{
	errcode_t	retval;
	blk64_t		block;

	if (fs->get_alloc_block) {
		retval = (fs->get_alloc_block)(fs, goal, &block);
		if (retval)
			goto fail;
	} else {
		if (!fs->block_map) {
			retval = ext2fs_read_block_bitmap(fs);
			if (retval)
				goto fail;
		}

		retval = ext2fs_new_block2(fs, goal, 0, &block);
		if (retval)
			goto fail;
	}

	if (block_buf) {
		memset(block_buf, 0, fs->blocksize);
		retval = io_channel_write_blk64(fs->io, block, 1, block_buf);
	} else
		retval = ext2fs_zero_blocks2(fs, block, 1, NULL, NULL);
	if (retval)
		goto fail;

	ext2fs_block_alloc_stats2(fs, block, +1);
	*ret = block;

fail:
	return retval;
}
/*
 * This function creates a journal using direct I/O routines.
 */
static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
				     blk_t num_blocks, int flags)
{
	char			*buf;
	dgrp_t			group, start, end, i, log_flex;
	errcode_t		retval;
	struct ext2_inode	inode;
	unsigned long long	inode_size;
	struct mkjournal_struct	es;

	if ((retval = ext2fs_create_journal_superblock(fs, num_blocks, flags,
						       &buf)))
		return retval;

	if ((retval = ext2fs_read_bitmaps(fs)))
		goto out2;

	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
		goto out2;

	if (inode.i_blocks > 0) {
		retval = EEXIST;
		goto out2;
	}

	es.num_blocks = num_blocks;
	es.newblocks = 0;
	es.buf = buf;
	es.err = 0;
	es.flags = flags;
	es.zero_count = 0;

	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
		inode.i_flags |= EXT4_EXTENTS_FL;
		if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
			goto out2;
	}

	/*
	 * Set the initial goal block to be roughly at the middle of
	 * the filesystem.  Pick a group that has the largest number
	 * of free blocks.
	 */
	group = ext2fs_group_of_blk2(fs, (ext2fs_blocks_count(fs->super) -
					 fs->super->s_first_data_block) / 2);
	log_flex = 1 << fs->super->s_log_groups_per_flex;
	if (fs->super->s_log_groups_per_flex && (group > log_flex)) {
		group = group & ~(log_flex - 1);
		while ((group < fs->group_desc_count) &&
		       ext2fs_bg_free_blocks_count(fs, group) == 0)
			group++;
		if (group == fs->group_desc_count)
			group = 0;
		start = group;
	} else
		start = (group > 0) ? group-1 : group;
	end = ((group+1) < fs->group_desc_count) ? group+1 : group;
	group = start;
	for (i=start+1; i <= end; i++)
		if (ext2fs_bg_free_blocks_count(fs, i) >
		    ext2fs_bg_free_blocks_count(fs, group))
			group = i;

	es.goal = ext2fs_group_first_block2(fs, group);
	retval = ext2fs_block_iterate3(fs, journal_ino, BLOCK_FLAG_APPEND,
				       0, mkjournal_proc, &es);
	if (es.err) {
		retval = es.err;
		goto errout;
	}
	if (es.zero_count) {
		retval = ext2fs_zero_blocks2(fs, es.blk_to_zero,
					    es.zero_count, 0, 0);
		if (retval)
			goto errout;
	}

	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
		goto errout;

	inode_size = (unsigned long long)fs->blocksize * num_blocks;
	inode.i_size = inode_size & 0xFFFFFFFF;
	inode.i_size_high = (inode_size >> 32) & 0xFFFFFFFF;
	if (ext2fs_needs_large_file_feature(inode_size))
		fs->super->s_feature_ro_compat |=
			EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
	ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
	inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
	inode.i_links_count = 1;
	inode.i_mode = LINUX_S_IFREG | 0600;

	if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode)))
		goto errout;
	retval = 0;

	memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
	fs->super->s_jnl_blocks[15] = inode.i_size_high;
	fs->super->s_jnl_blocks[16] = inode.i_size;
	fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
	ext2fs_mark_super_dirty(fs);

errout:
	ext2fs_zero_blocks2(0, 0, 0, 0, 0);
out2:
	ext2fs_free_mem(&buf);
	return retval;
}
static int mkjournal_proc(ext2_filsys	fs,
			  blk64_t	*blocknr,
			  e2_blkcnt_t	blockcnt,
			  blk64_t	ref_block EXT2FS_ATTR((unused)),
			  int		ref_offset EXT2FS_ATTR((unused)),
			  void		*priv_data)
{
	struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
	blk64_t	new_blk;
	errcode_t	retval;

	if (*blocknr) {
		es->goal = *blocknr;
		return 0;
	}
	if (blockcnt &&
	    (EXT2FS_B2C(fs, es->goal) == EXT2FS_B2C(fs, es->goal+1)))
		new_blk = es->goal+1;
	else {
		es->goal &= ~EXT2FS_CLUSTER_MASK(fs);
		retval = ext2fs_new_block2(fs, es->goal, 0, &new_blk);
		if (retval) {
			es->err = retval;
			return BLOCK_ABORT;
		}
		ext2fs_block_alloc_stats2(fs, new_blk, +1);
		es->newblocks++;
	}
	if (blockcnt >= 0)
		es->num_blocks--;

	retval = 0;
	if (blockcnt <= 0)
		retval = io_channel_write_blk64(fs->io, new_blk, 1, es->buf);
	else if (!(es->flags & EXT2_MKJOURNAL_LAZYINIT)) {
		if (es->zero_count) {
			if ((es->blk_to_zero + es->zero_count == new_blk) &&
			    (es->zero_count < 1024))
				es->zero_count++;
			else {
				retval = ext2fs_zero_blocks2(fs,
							     es->blk_to_zero,
							     es->zero_count,
							     0, 0);
				es->zero_count = 0;
			}
		}
		if (es->zero_count == 0) {
			es->blk_to_zero = new_blk;
			es->zero_count = 1;
		}
	}

	if (blockcnt == 0)
		memset(es->buf, 0, fs->blocksize);

	if (retval) {
		es->err = retval;
		return BLOCK_ABORT;
	}
	*blocknr = es->goal = new_blk;

	if (es->num_blocks == 0)
		return (BLOCK_CHANGED | BLOCK_ABORT);
	else
		return BLOCK_CHANGED;

}
Exemple #5
0
/*
 * This function creates a journal using direct I/O routines.
 */
static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
				     blk_t num_blocks, blk64_t goal, int flags)
{
	char			*buf;
	errcode_t		retval;
	struct ext2_inode	inode;
	unsigned long long	inode_size;
	struct mkjournal_struct	es;

	if ((retval = ext2fs_create_journal_superblock(fs, num_blocks, flags,
						       &buf)))
		return retval;

	if ((retval = ext2fs_read_bitmaps(fs)))
		goto out2;

	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
		goto out2;

	if (inode.i_blocks > 0) {
		retval = EEXIST;
		goto out2;
	}

	es.num_blocks = num_blocks;
	es.newblocks = 0;
	es.buf = buf;
	es.err = 0;
	es.flags = flags;
	es.zero_count = 0;
	es.goal = (goal != ~0ULL) ? goal : get_midpoint_journal_block(fs);

	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
		inode.i_flags |= EXT4_EXTENTS_FL;
		if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
			goto out2;
	}

	retval = ext2fs_block_iterate3(fs, journal_ino, BLOCK_FLAG_APPEND,
				       0, mkjournal_proc, &es);
	if (retval)
		goto out2;
	if (es.err) {
		retval = es.err;
		goto out2;
	}
	if (es.zero_count) {
		retval = ext2fs_zero_blocks2(fs, es.blk_to_zero,
					    es.zero_count, 0, 0);
		if (retval)
			goto out2;
	}

	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
		goto out2;

	inode_size = (unsigned long long)fs->blocksize * num_blocks;
	ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
	inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
	inode.i_links_count = 1;
	inode.i_mode = LINUX_S_IFREG | 0600;
	retval = ext2fs_inode_size_set(fs, &inode, inode_size);
	if (retval)
		goto out2;

	if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode)))
		goto out2;
	retval = 0;

	memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
	fs->super->s_jnl_blocks[15] = inode.i_size_high;
	fs->super->s_jnl_blocks[16] = inode.i_size;
	fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
	ext2fs_mark_super_dirty(fs);

out2:
	ext2fs_free_mem(&buf);
	return retval;
}
Exemple #6
0
static errcode_t mk_hugefile(ext2_filsys fs, blk64_t num,
			     ext2_ino_t dir, unsigned long idx, ext2_ino_t *ino)

{
	errcode_t		retval;
	blk64_t			lblk, bend = 0;
	__u64			size;
	blk64_t			left;
	blk64_t			count = 0;
	struct ext2_inode	inode;
	ext2_extent_handle_t	handle;

	retval = ext2fs_new_inode(fs, 0, LINUX_S_IFREG, NULL, ino);
	if (retval)
		return retval;

	memset(&inode, 0, sizeof(struct ext2_inode));
	inode.i_mode = LINUX_S_IFREG | (0666 & ~fs->umask);
	inode.i_links_count = 1;
	inode.i_uid = uid & 0xFFFF;
	ext2fs_set_i_uid_high(inode, (uid >> 16) & 0xffff);
	inode.i_gid = gid & 0xFFFF;
	ext2fs_set_i_gid_high(inode, (gid >> 16) & 0xffff);

	retval = ext2fs_write_new_inode(fs, *ino, &inode);
	if (retval)
		return retval;

	ext2fs_inode_alloc_stats2(fs, *ino, +1, 0);

	retval = ext2fs_extent_open2(fs, *ino, &inode, &handle);
	if (retval)
		return retval;

	/*
	 * We don't use ext2fs_fallocate() here because hugefiles are
	 * designed to be physically contiguous (if the block group
	 * descriptors are configured to be in a single block at the
	 * beginning of the file system, by using the
	 * packed_meta_blocks layout), with the extent tree blocks
	 * allocated near the beginning of the file system.
	 */
	lblk = 0;
	left = num ? num : 1;
	while (left) {
		blk64_t pblk, end;
		blk64_t n = left;

		retval =  ext2fs_find_first_zero_block_bitmap2(fs->block_map,
			goal, ext2fs_blocks_count(fs->super) - 1, &end);
		if (retval)
			goto errout;
		goal = end;

		retval =  ext2fs_find_first_set_block_bitmap2(fs->block_map, goal,
			       ext2fs_blocks_count(fs->super) - 1, &bend);
		if (retval == ENOENT) {
			bend = ext2fs_blocks_count(fs->super);
			if (num == 0)
				left = 0;
		}
		if (!num || bend - goal < left)
			n = bend - goal;
		pblk = goal;
		if (num)
			left -= n;
		goal += n;
		count += n;
		ext2fs_block_alloc_stats_range(fs, pblk, n, +1);

		if (zero_hugefile) {
			blk64_t ret_blk;
			retval = ext2fs_zero_blocks2(fs, pblk, n,
						     &ret_blk, NULL);

			if (retval)
				com_err(program_name, retval,
					_("while zeroing block %llu "
					  "for hugefile"), ret_blk);
		}

		while (n) {
			blk64_t l = n;
			struct ext2fs_extent newextent;

			if (l > EXT_INIT_MAX_LEN)
				l = EXT_INIT_MAX_LEN;

			newextent.e_len = l;
			newextent.e_pblk = pblk;
			newextent.e_lblk = lblk;
			newextent.e_flags = 0;

			retval = ext2fs_extent_insert(handle,
					EXT2_EXTENT_INSERT_AFTER, &newextent);
			if (retval)
				return retval;
			pblk += l;
			lblk += l;
			n -= l;
		}
	}

	retval = ext2fs_read_inode(fs, *ino, &inode);
	if (retval)
		goto errout;

	retval = ext2fs_iblk_add_blocks(fs, &inode,
					count / EXT2FS_CLUSTER_RATIO(fs));
	if (retval)
		goto errout;
	size = (__u64) count * fs->blocksize;
	retval = ext2fs_inode_size_set(fs, &inode, size);
	if (retval)
		goto errout;

	retval = ext2fs_write_new_inode(fs, *ino, &inode);
	if (retval)
		goto errout;

	if (idx_digits)
		sprintf(fn_numbuf, "%0*lu", idx_digits, idx);
	else if (num_files > 1)
		sprintf(fn_numbuf, "%lu", idx);

retry:
	retval = ext2fs_link(fs, dir, fn_buf, *ino, EXT2_FT_REG_FILE);
	if (retval == EXT2_ET_DIR_NO_SPACE) {
		retval = ext2fs_expand_dir(fs, dir);
		if (retval)
			goto errout;
		goto retry;
	}

	if (retval)
		goto errout;

errout:
	if (handle)
		ext2fs_extent_free(handle);

	return retval;
}