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dm: remove limited barrier support

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Prepare for full barrier implementation: first remove the restricted support.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka
2009-04-09 00:27:13 +01:00
committed by Alasdair G Kergon
parent 9c47008d13
commit 692d0eb9e0
5 changed files with 10 additions and 27 deletions
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19
drivers/md/dm-table.c
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@ -52,8 +52,6 @@ struct dm_table {
sector_t *highs;
struct dm_target *targets;
unsigned barriers_supported:1;
/*
* Indicates the rw permissions for the new logical
* device. This should be a combination of FMODE_READ
@ -243,7 +241,6 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
INIT_LIST_HEAD(&t->devices);
atomic_set(&t->holders, 0);
t->barriers_supported = 1;
if (!num_targets)
num_targets = KEYS_PER_NODE;
@ -751,10 +748,6 @@ int dm_table_add_target(struct dm_table *t, const char *type,
/* FIXME: the plan is to combine high here and then have
* the merge fn apply the target level restrictions. */
combine_restrictions_low(&t->limits, &tgt->limits);
if (!(tgt->type->features & DM_TARGET_SUPPORTS_BARRIERS))
t->barriers_supported = 0;
return 0;
bad:
@ -799,12 +792,6 @@ int dm_table_complete(struct dm_table *t)
check_for_valid_limits(&t->limits);
/*
* We only support barriers if there is exactly one underlying device.
*/
if (!list_is_singular(&t->devices))
t->barriers_supported = 0;
/* how many indexes will the btree have ? */
leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
@ -1059,12 +1046,6 @@ struct mapped_device *dm_table_get_md(struct dm_table *t)
return t->md;
}
int dm_table_barrier_ok(struct dm_table *t)
{
return t->barriers_supported;
}
EXPORT_SYMBOL(dm_table_barrier_ok);
EXPORT_SYMBOL(dm_vcalloc);
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);