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Subject[PATCH v2 2/2] ext4: Ignore a stripe width of 1
Date
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>
---
fs/ext4/super.c | 22 ++++++++++++++++------
1 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9ea71aa..0a3745b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2383,17 +2383,27 @@ static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
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;

- if (stripe_width <= sbi->s_blocks_per_group)
- return stripe_width;
+ else if (stripe_width <= sbi->s_blocks_per_group)
+ ret = stripe_width;

- if (stride <= sbi->s_blocks_per_group)
- return stride;
+ else if (stride <= sbi->s_blocks_per_group)
+ ret = stride;
+ else
+ ret = 0;

- return 0;
+ /*
+ * 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;
+
+ return ret;
}

/* sysfs supprt */
--
1.7.3.1


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