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When checking the minimal nr_devs, there is one dead and meaningless
condition:
if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This condition is meaningless, @devs_increment has nothing to do with
@sub_stripes.
In fact, in btrfs_raid_array[], profile with sub_stripes larger than 1
(RAID10) already has the @devs_increment set to 2.
So no need to multiple it by @sub_stripes.
And above condition is also dead.
For RAID10, @devs_increment * @sub_stripes equals 4, which is also the
@devs_min of RAID10.
For other profiles, @sub_stripes is always 1, and since @ndevs is
rounded down to @devs_increment, the condition will always be true.
Remove the meaningless condition to make later reader wander less.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
ba89b80268