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staging: lustre: add ability to migrate inodes.
Add client support to migrate the individual inodes from one MDT to another MDT, and this functionality will only migrate inode layout on MDT but not touch data object on OST. The directory will be migrated from top to the bottom, i.e. migrating parent first, then migrating the child. Signed-off-by: wang di <di.wang@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2430 Reviewed-on: http://review.whamcloud.com/6662 Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com> Reviewed-by: John L. Hammond <john.hammond@intel.com> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: James Simmons <jsimmons@infradead.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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