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Commit 3eb08658 authored by Dan Ehrenberg's avatar Dan Ehrenberg Committed by Theodore Ts'o
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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: default avatarDan Ehrenberg <dehrenberg@google.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent d7a1fee1

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 */