bcachefs: target_congested -> get_random_u32_below()

Kent Overstreet · Kent Overstreet · commit 69a5a13a22b1 · 2025-03-13T12:39:21.000-04:00
get_random_u32_below() has a better algorithm than bch2_rand_range(),
it just didn't exist at the time.

Signed-off-by: Kent Overstreet &lt;kent.overstreet@linux.dev&gt;
diff --git a/fs/bcachefs/io_read.c b/fs/bcachefs/io_read.c
@@ -59,7 +59,7 @@ static bool bch2_target_congested(struct bch_fs *c, u16 target)
 	}
 	rcu_read_unlock();
 
-	return bch2_rand_range(nr * CONGESTED_MAX) < total;
+	return get_random_u32_below(nr * CONGESTED_MAX) < total;
 }
 
 #else

Original file line number	Diff line number	Diff line change
`@@ -59,7 +59,7 @@ static bool bch2_target_congested(struct bch_fs *c, u16 target)`
`59`	`59`	`}`
`60`	`60`	`rcu_read_unlock();`
`61`	`61`
`62`		`- return bch2_rand_range(nr * CONGESTED_MAX) < total;`
	`62`	`+ return get_random_u32_below(nr * CONGESTED_MAX) < total;`
`63`	`63`	`}`
`64`	`64`
`65`	`65`	`#else`