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md: disconnect device from personality before trying to remove it.
When the HOT_REMOVE_DISK ioctl is used to remove a device, we call remove_and_add_spares() which will remove it from the personality if possible. This improves the chances that the removal will succeed. When writing "remove" to dev-XX/state, we don't. So that can fail more easily. So add the remove_and_add_spares() into "remove" handling. Signed-off-by: NeilBrown <[email protected]> Signed-off-by: Shaohua Li <[email protected]>
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