1999-08-23 Roland McGrath <roland@baalperazim.frob.com>

	* balloc.c (ext2_new_block): Take new arg PREALLOC_GOAL.
	Use that instead of hard-coded 8 as maximum of blocks to preallocate.
	Also test that instead of PREALLOC_COUNT to decide whether to
	try any preallocation at all.
	* getblk.c (ext2_alloc_block): Pass new arg to ext2_new_block.
	Use EXT2_DEFAULT_PREALLOC_BLOCKS as default (replaces hard-coded 8);
	For a regular file, use SBLOCK->s_prealloc_blocks before default.
	For a directory, use SBLOCK->s_dir_prealloc_blocks if the
	EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is set, otherwise zero.
	* inode.c (diskfs_set_translator): Pass new arg (zero).

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