md: remove 'idx' from 'struct resync_pages'
bio_add_page() won't fail for resync bio, and the page index for each bio is same, so remove it. More importantly the 'idx' of 'struct resync_pages' is initialized in mempool allocator function, the current way is wrong since mempool is only responsible for allocation, we can't use that for initialization. Suggested-by: NNeilBrown <neilb@suse.com> Reported-by: NNeilBrown <neilb@suse.com> Reported-and-tested-by: NPatrick <dto@gmx.net> Fixes: f0250618(md: raid10: don't use bio's vec table to manage resync pages) Fixes: 98d30c58(md: raid1: don't use bio's vec table to manage resync pages) Cc: stable@vger.kernel.org (4.12+) Signed-off-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NShaohua Li <shli@fb.com>
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