Re: [patch] truncate fixes

[Andrew Morton]

Andrea Arcangeli wrote:
> 
> I prefer my fix that simply recalls the ->truncate callback if -ENOSPC
> is returned by prepare_write. vmtruncate seems way overkill,

No opinion on that here.  This is what was in -ac.  Perhaps Al can
comment?

> and after
> calling ->truncate the __block_prepare_changes above won't be necessary
> because the leftover will be correctly deallocated (no need to clear
> them out and to mark them dirty, they will just go away before any
> readpage can see them).

No, this code is needed if the write is _inside_ i_size, to an
uninstantiated block.  truncate won't remove those blocks, and we've
gone and added them to the file.

-