Re: fragmentation && blocks "realloc"

[Jan Koss <kossjan@gmail.com>]

In comparison with this
> bh = sb_bread(sb, oldblock);
> if (!bh)
>   goto err;
> bh->b_blocknr = newblk;
> mark_buffer_dirty (bh);
> unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
>

this code like this didn't cause any "warrnings":
struct buffer_head *newbh;

bh = sb_bread(sb, oldblock);
newbh = sb_bread(sb, newblock);
if (!(bh || newbh))
  goto err;

memcpy(newbh->b_data, bh->b_data, sb->s_blocksize);
mark_buffer_dirty(newbh);
brelse(bh);
brelse(newbh);
invalidate_inode_buffers(inode);

but it didn't optimal,
much better what you suggest, but...