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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: Dan Ehrenberg <dehrenberg@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Dan Ehrenberg 2011-07-17 21:18:51 -04:00 committed by Theodore Ts'o
parent d7a1fee135
commit 3eb0865843
1 changed files with 15 additions and 7 deletions
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22
fs/ext4/super.c
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@ -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;
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 */