ext2fs slow on 2.3.99.pre6

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Trying 2.3.99.pre6 we saw 2 odd things:

1. pre6 is slower but than to 2.2.14 on ext2fs:

        2.3.99.pre6 open64():
                [root@cj11 thief]# ./zero /
                Zeroing /
                ZeroPath(//CCS0.TMP), 0B
                ZeroPath(/), 6375MB 2:03:27, 860k/second

        2.2.14 open64(): (can only generate 2 gig files)

                [root@cj11 thief]# ./zero /
                ZeroPath(//CCS0.TMP), 0B
                ZeroPath(//CCS1.TMP), 2147MB
                ZeroPath(//CCS2.TMP), 4294MB
                ZeroPath(/), 6375MB 8:38, 12M/second
                                        (FAT32 was 7811k/second)

2. A 14 gigabyte ext2fs with 8 GB free was filled with
   maximum size files. After the files are deleted df
   only reports 6 GB free. This is true of both 2.2.14 and pre6.

        Filesystem 1k-blocks Used Available Use% Mounted on
        /dev/hdd4 12649960 4317476 7689884 36% /

        (...generate files and delete them ...)

        [root@cj11 /]# df
        Filesystem 1k-blocks Used Available Use% Mounted on
        /dev/hdd4 12649960 6417676 5589684 53% /
                                                -----------
                                                   2100204 blocks lost.

(Abit BP6 dual Celeron 466 256MB dual ATA66 WD18000)

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