btrfs: calculate physical_end using dev_extent_len directly in scrub_stripe()

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The variable @physical_end is the exclusive stripe end, currently it's
calculated using @physical + @dev_extent_len / map->stripe_len *
 map->stripe_len.

And since at allocation time we ensured dev_extent_len is stripe_len
aligned, the result is the same as @physical + @dev_extent_len.

So this patch will just assign @physical and @physical_end early,
without using @nstripes.

This is especially helpful for any possible out: label user, as now we
only need to initialize @offset before going to out: label.

Since we're here, also make @physical_end constant.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Qu Wenruo 2022-03-11 15:38:41 +08:00 • committed by David Sterba

parent 48b36a602a

commit 1194a82481

1 changed files with 2 additions and 4 deletions

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fs/btrfs/scrub.c

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