ext4: ignore a stripe width of 1 (3eb08658) · Commits · 戴 / test

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>

fs/ext4/super.c

+15 −7

Original line number	Diff line number	Diff line
		@@ -2384,17 +2384,25 @@ 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;

		if (stripe_width <= sbi->s_blocks_per_group)
		return stripe_width;
		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 (stride <= sbi->s_blocks_per_group)
		return stride;
		/*
		* 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 0;
		return ret;
		}

		/* sysfs supprt */

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