Re: [md PATCH 00/24] Allow bitmaps to be resized.

[Jack Wang <jack.wang.usish@xxxxxxxxx>]

Dear Neil,

Thanks for your good works.
One query about current grow supporting  status:

as the raid wiki show : the RAID level 1/4/5/6 array can be grown . In
my test I can grow raid 1 add disk or remove disk through mdadm grow,
but change level from 1 to 4 or 5 will fail. the simaliar command work
for change level between 4/5/6, change 1 to 10 fail too.

My kernel version is 3.2.15. mdadm version 3.2.3.


Jack

2012/4/17 NeilBrown <neilb@xxxxxxx>:
>
> The following series has just been added to my for-next queue
> and so should be in 3.5.
>  git://neil.brown.name/md for-next
>  git://github.com/neilbrown/linux.git md/for-next
>
> It allows md to resize a bitmap on an active array.  This
> means that arrays can now be reshaped without first removing the
> bitmap.  The bitmap is resized in-place.
>
> As always: review and testing would be greatly appreciated.
>
> NeilBrown
>
> ---
>
> NeilBrown (24):
>      md/raid5: Allow reshape while a bitmap is present.
>      md/raid10: resize bitmap when required during reshape.
>      md: allow array to be resized while bitmap is present.
>      md/bitmap: make sure reshape request are reflected in superblock.
>      md/bitmap: add bitmap_resize function to allow bitmap resizing.
>      md/bitmap: use DIV_ROUND_UP instead of open-code
>      md/bitmap: create a 'struct bitmap_counts' substructure of 'struct bitmap'
>      md/bitmap: make bitmap bitops atomic.
>      md/bitmap: make _page_attr bitops atomic.
>      md/bitmap: merge bitmap_file_unmap and bitmap_file_put.
>      md/bitmap: remove async freeing of bitmap file.
>      md/bitmap: convert some spin_lock_irqsave to spin_lock_irq
>      md/bitmap: use set_bit, test_bit, etc for operation on bitmap->flags.
>      md/bitmap: remove single-bit manipulation on sb->state
>      md/bitmap: remove bitmap_mask_state
>      md/bitmap: move storage allocation from bitmap_load to bitmap_create.
>      md/bitmap: separate bitmap file allocation to its own function.
>      md/bitmap: store bytes in file rather than just in last page.
>      md/bitmap: move some fields of 'struct bitmap' into a 'storage' substruct.
>      md/bitmap: change *_page_attr() to take a page number, not a page.
>      md/bitmap: centralise allocation of bitmap file pages.
>      md/bitmap: allow a bitmap with no backing storage.
>      md/bitmap: add new 'space' attribute for bitmaps.
>      md/bitmap: disentangle two different 'pending' flags.
>
>
>  drivers/md/bitmap.c | 1089 +++++++++++++++++++++++++++++----------------------
>  drivers/md/bitmap.h |   58 ++-
>  drivers/md/md.c     |   53 ++
>  drivers/md/md.h     |    3
>  drivers/md/raid1.c  |   11 -
>  drivers/md/raid10.c |   47 +-
>  drivers/md/raid5.c  |   20 +
>  7 files changed, 754 insertions(+), 527 deletions(-)
>
> --
> Signature
>
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