ext4: ignore a stripe width of 1
If the stripe width was set to 1, then this patch will ignore
that stripe width and ext4 will act as if the stripe width
were 0 with respect to optimizing allocations.
Signed-off-by: Dan Ehrenberg <dehrenberg@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7910e61..143d763 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2384,17 +2384,25 @@
unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
unsigned long stripe_width =
le32_to_cpu(sbi->s_es->s_raid_stripe_width);
+ int ret;
if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
- return sbi->s_stripe;
+ ret = sbi->s_stripe;
+ else if (stripe_width <= sbi->s_blocks_per_group)
+ ret = stripe_width;
+ else if (stride <= sbi->s_blocks_per_group)
+ ret = stride;
+ else
+ ret = 0;
- if (stripe_width <= sbi->s_blocks_per_group)
- return stripe_width;
+ /*
+ * If the stripe width is 1, this makes no sense and
+ * we set it to 0 to turn off stripe handling code.
+ */
+ if (ret <= 1)
+ ret = 0;
- if (stride <= sbi->s_blocks_per_group)
- return stride;
-
- return 0;
+ return ret;
}
/* sysfs supprt */