md/raid5: support config stripe_size by sysfs entry
Adding a new 'stripe_size' sysfs entry to set and show stripe_size. stripe_size should not be bigger than PAGE_SIZE, and it requires to be multiple of 4096. We can adjust stripe_size by writing value into sysfs entry, likely, set stripe_size as 16KB: echo 16384 > /sys/block/md1/md/stripe_size Show current stripe_size value: cat /sys/block/md1/md/stripe_size For PAGE_SIZE is equal to 4096, 'stripe_size' can just be read. Signed-off-by:Yufen Yu <yuyufen@huawei.com> Signed-off-by:
Song Liu <songliubraving@fb.com>
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e2368582