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    Subject[PATCH 4/6] UDF cleanup and fixes
    Add a few assertions into udf_discard_prealloc() to check that the file
    is sane (mostly helps debugging further patches ;).

    Signed-off-by: Jan Kara <jack@suse.cz>

    diff -rupX /home/jack/.kerndiffexclude linux-2.6.20-3-udf_buffer_handling/fs/udf/truncate.c linux-2.6.20-4-udf_discard_prealloc_cleanup/fs/udf/truncate.c
    --- linux-2.6.20-3-udf_buffer_handling/fs/udf/truncate.c 2007-03-06 15:02:33.000000000 +0100
    +++ linux-2.6.20-4-udf_discard_prealloc_cleanup/fs/udf/truncate.c 2007-03-06 15:03:00.000000000 +0100
    @@ -88,8 +88,9 @@ void udf_discard_prealloc(struct inode *
    {
    etype = netype;
    lbcount += elen;
    - if (lbcount > inode->i_size && lbcount - inode->i_size < inode->i_sb->s_blocksize)
    + if (lbcount > inode->i_size && lbcount - elen < inode->i_size)
    {
    + WARN_ON(lbcount - inode->i_size >= inode->i_sb->s_blocksize);
    nelen = elen - (lbcount - inode->i_size);
    epos.offset -= adsize;
    extent_trunc(inode, &epos, eloc, etype, elen, nelen);
    @@ -119,6 +120,7 @@ void udf_discard_prealloc(struct inode *
    }
    UDF_I_LENEXTENTS(inode) = lbcount;

    + WARN_ON(lbcount != inode->i_size);
    brelse(epos.bh);
    }

    -
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