On Jan 09, 2008 22:37 +0530, Aneesh Kumar K.V wrote:
> The stipe size used during block allocation is calculated as below.
> a) if we specify a stripe=<value> option using mount time. Use that value.
> b) if not use the value specified in super block.
> b) If the value specfied at mount time is greater than blocks per group use
> the value specified ini the super block.
What if the value on disk is also bad? I'd add (after the second 'b' :-):
d) if s_stripe is still > s_blocks_per_group try s_raid_stride
e) if s_stripe is still > s_blocks_per_group use 0
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> ---
> fs/ext4/super.c | 10 ++++++++++
> 1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index db1edc8..10330eb 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2136,6 +2136,16 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
> sbi->s_rsv_window_head.rsv_alloc_hit = 0;
> sbi->s_rsv_window_head.rsv_goal_size = 0;
> ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
> + /*
> + * set the stripe size. If we have specified it via mount option, then
> + * use the mount option value. If the value specified at mount time is
> + * greater than the blocks per group use the super block value.
> + * Allocator needs it be less than blocks per group.
> + */
> + if (!sbi->s_stripe ||
> + sbi->s_stripe >= sbi->s_blocks_per_group) {
Please fix alignment to be just after '(' on previous line.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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