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Lai Siyao authored
This patch adds directory restripe support: * 'lfs setdirstripe -m -1 -c <stripe_count>' on an existed directory will change this directory layout, if 'stripe_count' is larger than current count, new stripes are allocated after current stripes, otherwise merge stripes of this directory, NB, if stripe count is unchanged, but hash type changed, it's treated as merging, but rehashing actually. * mdt_restripe() ia added to restripe directory. * mdd_dir_declare_layout_split() is added to split directory, which handles both plain and striped directory split. * lod_dir_declare_layout_split() will handle the internal of directory split. * directory merge is simple compared to split, which just records target stripe count in LMV, and update it. NB. this patch only restripe directory, but doesn't add the code to migrate sub files, which will be implemented in the following patch. Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com> Change-Id: I526f7423b909eb83cf8723e65981d713b3e42499 Reviewed-on: https://review.whamcloud.com/36898 Tested-by: jenkins <devops@whamcloud.com> Tested-by: Maloo <maloo@whamcloud.com> Reviewed-by: Andreas Dilger <adilger@whamcloud.com> Reviewed-by: Hongchao Zhang <hongchao@whamcloud.com> Reviewed-by: Yingjin Qian <qian@ddn.com> Reviewed-by: Oleg Drokin <green@whamcloud.com>
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