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md: raid0: make hash_spacing and preshift sector-based.

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This patch renames the hash_spacing and preshift members of struct
raid0_private_data to spacing and sector_shift respectively and
changes the semantics as follows:

We always have spacing = 2 * hash_spacing. In case
sizeof(sector_t) > sizeof(u32) we also have sector_shift = preshift + 1
while sector_shift = preshift = 0 otherwise.

Note that the values of nb_zone and zone are unaffected by these changes
because in the sector_div() preceeding the assignement of these two
variables both arguments double.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Andre Noll
2009-01-09 08:31:08 +11:00
committed by NeilBrown
parent 83838ed878
commit ccacc7d2cf
2 changed files with 31 additions and 31 deletions
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4
include/linux/raid/raid0.h
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@@ -19,8 +19,8 @@ struct raid0_private_data
mdk_rdev_t **devlist; /* lists of rdevs, pointed to by strip_zone->dev */
int nr_strip_zones;
sector_t hash_spacing;
int preshift; /* shift this before divide by hash_spacing */
sector_t spacing;
int sector_shift; /* shift this before divide by spacing */
};
typedef struct raid0_private_data raid0_conf_t;