Commit e1240137 authored by Joe Thornber's avatar Joe Thornber Committed by Greg Kroah-Hartman

[PATCH] dm: Replace __HIGH() and __LOW() macros

Replace __HIGH() and __LOW() with max() and min_not_zero().
parent 18234c8b
......@@ -78,22 +78,33 @@ static unsigned int int_log(unsigned long n, unsigned long base)
return result;
}
#define __HIGH(l, r) if (*(l) < (r)) *(l) = (r)
#define __LOW(l, r) if (*(l) == 0 || *(l) > (r)) *(l) = (r)
/*
* Returns the minimum that is _not_ zero, unless both are zero.
*/
#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
/*
* Combine two io_restrictions, always taking the lower value.
*/
static void combine_restrictions_low(struct io_restrictions *lhs,
struct io_restrictions *rhs)
{
__LOW(&lhs->max_sectors, rhs->max_sectors);
__LOW(&lhs->max_phys_segments, rhs->max_phys_segments);
__LOW(&lhs->max_hw_segments, rhs->max_hw_segments);
__HIGH(&lhs->hardsect_size, rhs->hardsect_size);
__LOW(&lhs->max_segment_size, rhs->max_segment_size);
__LOW(&lhs->seg_boundary_mask, rhs->seg_boundary_mask);
lhs->max_sectors =
min_not_zero(lhs->max_sectors, rhs->max_sectors);
lhs->max_phys_segments =
min_not_zero(lhs->max_phys_segments, rhs->max_phys_segments);
lhs->max_hw_segments =
min_not_zero(lhs->max_hw_segments, rhs->max_hw_segments);
lhs->hardsect_size = max(lhs->hardsect_size, rhs->hardsect_size);
lhs->max_segment_size =
min_not_zero(lhs->max_segment_size, rhs->max_segment_size);
lhs->seg_boundary_mask =
min_not_zero(lhs->seg_boundary_mask, rhs->seg_boundary_mask);
}
/*
......@@ -481,13 +492,31 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
request_queue_t *q = bdev_get_queue((*result)->bdev);
struct io_restrictions *rs = &ti->limits;
/* combine the device limits low */
__LOW(&rs->max_sectors, q->max_sectors);
__LOW(&rs->max_phys_segments, q->max_phys_segments);
__LOW(&rs->max_hw_segments, q->max_hw_segments);
__HIGH(&rs->hardsect_size, q->hardsect_size);
__LOW(&rs->max_segment_size, q->max_segment_size);
__LOW(&rs->seg_boundary_mask, q->seg_boundary_mask);
/*
* Combine the device limits low.
*
* FIXME: if we move an io_restriction struct
* into q this would just be a call to
* combine_restrictions_low()
*/
rs->max_sectors =
min_not_zero(rs->max_sectors, q->max_sectors);
rs->max_phys_segments =
min_not_zero(rs->max_phys_segments,
q->max_phys_segments);
rs->max_hw_segments =
min_not_zero(rs->max_hw_segments, q->max_hw_segments);
rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size);
rs->max_segment_size =
min_not_zero(rs->max_segment_size, q->max_segment_size);
rs->seg_boundary_mask =
min_not_zero(rs->seg_boundary_mask,
q->seg_boundary_mask);
}
return r;
......
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