[Ocfs2-tools-devel] [PATCH 0/7] Add "sparse" feature change in tunefs.ocfs2, take 3

[tao.ma]

Tao Ma wrote:
> Change from V1 to V2:
>   
Sorry, my fault. It should be from V2 to V3.
> 1. Many minor changes have been made, so they are explained seperately
>    in the seperated patches.
> 2. Two more patches have been added. They are:
>    1) Move io_cache into main tunefs.c, so that all the operations in
>       tunefs can benefit from it.
>    2) Add judgement in remove slot, so that it can't coexist with
>       "sparse" functions.
>
> The disk layout for ocfs2 volume will be changed for sparse files in 1.4,
> so for some boxes which have ocfs2-1.2.* installed, it is impossible for
> them to access the new-formatted devices. On the other hand, for some
> old-formatted volume, we could turn on this feature so that the future
> cluster allocation can use it to save space.
>
> Another new usage for tunefs.ocfs2 is to list all the sparse files in a
> volume. This is useful before a user want to disable "sparse_files".
> It will provide the user a quick way to list all such files. So he might
> just decide that some files are not worth it, like coredumps. And he may
> choose to remove them to save spaces.
>
> So add "--list-sparse" "--fs-features=[no]sparse" to tunefs.ocfs2, so
> that user can use them to do the feature modification work.
> tunfs.ocfs2 now also have to parse the feature-strings,
> so move the feature string parsing out of mkfs.ocfs2 and create
> a new file named feature_string.c in libocfs2 to handle this work.
> Now tunefs.ocfs2 can also use it.
>
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