Commit 692d0eb9 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
Browse files

dm: remove limited barrier support 



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

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 9c47008d

drivers/md/dm-linear.c

+0 −1
Original line number Diff line number Diff line
@@ -142,7 +142,6 @@ static struct target_type linear_target = { 
	.status = linear_status,

	.ioctl  = linear_ioctl,

	.merge  = linear_merge,

	.features = DM_TARGET_SUPPORTS_BARRIERS,

};



int __init dm_linear_init(void)

drivers/md/dm-table.c

+0 −19
Original line number Diff line number Diff line
@@ -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);

drivers/md/dm.c

+10 −5
Original line number Diff line number Diff line
@@ -851,11 +851,7 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio) 
		bio_io_error(bio);

		return;

	}

	if (unlikely(bio_barrier(bio) && !dm_table_barrier_ok(ci.map))) {

		dm_table_put(ci.map);

		bio_endio(bio, -EOPNOTSUPP);

		return;

	}



	ci.md = md;

	ci.bio = bio;

	ci.io = alloc_io(md);
@@ -937,6 +933,15 @@ static int dm_request(struct request_queue *q, struct bio *bio) 
	struct mapped_device *md = q->queuedata;

	int cpu;



	/*

	 * There is no use in forwarding any barrier request since we can't

	 * guarantee it is (or can be) handled by the targets correctly.

	 */

	if (unlikely(bio_barrier(bio))) {

		bio_endio(bio, -EOPNOTSUPP);

		return 0;

	}



	down_read(&md->io_lock);



	cpu = part_stat_lock();

drivers/md/dm.h

+0 −1
Original line number Diff line number Diff line
@@ -52,7 +52,6 @@ int dm_table_any_congested(struct dm_table *t, int bdi_bits); 
 * To check the return value from dm_table_find_target().

 */

#define dm_target_is_valid(t) ((t)->table)

int dm_table_barrier_ok(struct dm_table *t);



/*-----------------------------------------------------------------

 * A registry of target types.

include/linux/device-mapper.h

+0 −1
Original line number Diff line number Diff line
@@ -116,7 +116,6 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d); 
/*

 * Target features

 */

#define DM_TARGET_SUPPORTS_BARRIERS 0x00000001



struct target_type {

	uint64_t features;