Commit e0700ce7 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'dm-4.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm 

Pull device mapper updates from Mike Snitzer:
 "Smaller set of DM changes for this merge.  I've based these changes on
  Jens' for-4.4/reservations branch because the associated DM changes
  required it.

   - Revert a dm-multipath change that caused a regression for
     unprivledged users (e.g. kvm guests) that issued ioctls when a
     multipath device had no available paths.

   - Include Christoph's refactoring of DM's ioctl handling and add
     support for passing through persistent reservations with DM
     multipath.

   - All other changes are very simple cleanups"

* tag 'dm-4.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm switch: simplify conditional in alloc_region_table()
  dm delay: document that offsets are specified in sectors
  dm delay: capitalize the start of an delay_ctr() error message
  dm delay: Use DM_MAPIO macros instead of open-coded equivalents
  dm linear: remove redundant target name from error messages
  dm persistent data: eliminate unnecessary return values
  dm: eliminate unused "bioset" process for each bio-based DM device
  dm: convert ffs to __ffs
  dm: drop NULL test before kmem_cache_destroy() and mempool_destroy()
  dm: add support for passing through persistent reservations
  dm: refactor ioctl handling
  Revert "dm mpath: fix stalls when handling invalid ioctls"
  dm: initialize non-blk-mq queue data before queue is used
parents ac322de6 aad9ae45

Documentation/device-mapper/delay.txt

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ Parameters: 
    <device> <offset> <delay> [<write_device> <write_offset> <write_delay>]



With separate write parameters, the first set is only used for reads.

Offsets are specified in sectors.

Delays are specified in milliseconds.



Example scripts

drivers/md/dm-bufio.c

+7 −11
Original line number Diff line number Diff line
@@ -1598,11 +1598,11 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign 


	c->bdev = bdev;

	c->block_size = block_size;

	c->sectors_per_block_bits = ffs(block_size) - 1 - SECTOR_SHIFT;

	c->pages_per_block_bits = (ffs(block_size) - 1 >= PAGE_SHIFT) ?

				  ffs(block_size) - 1 - PAGE_SHIFT : 0;

	c->blocks_per_page_bits = (ffs(block_size) - 1 < PAGE_SHIFT ?

				  PAGE_SHIFT - (ffs(block_size) - 1) : 0);

	c->sectors_per_block_bits = __ffs(block_size) - SECTOR_SHIFT;

	c->pages_per_block_bits = (__ffs(block_size) >= PAGE_SHIFT) ?

				  __ffs(block_size) - PAGE_SHIFT : 0;

	c->blocks_per_page_bits = (__ffs(block_size) < PAGE_SHIFT ?

				  PAGE_SHIFT - __ffs(block_size) : 0);



	c->aux_size = aux_size;

	c->alloc_callback = alloc_callback;
@@ -1861,12 +1861,8 @@ static void __exit dm_bufio_exit(void) 
	cancel_delayed_work_sync(&dm_bufio_work);

	destroy_workqueue(dm_bufio_wq);



	for (i = 0; i < ARRAY_SIZE(dm_bufio_caches); i++) {

		struct kmem_cache *kc = dm_bufio_caches[i];



		if (kc)

			kmem_cache_destroy(kc);

	}

	for (i = 0; i < ARRAY_SIZE(dm_bufio_caches); i++)

		kmem_cache_destroy(dm_bufio_caches[i]);



	for (i = 0; i < ARRAY_SIZE(dm_bufio_cache_names); i++)

		kfree(dm_bufio_cache_names[i]);

drivers/md/dm-cache-metadata.c

+6 −2
Original line number Diff line number Diff line
@@ -260,7 +260,9 @@ static int __superblock_all_zeroes(struct dm_block_manager *bm, bool *result) 
		}

	}



	return dm_bm_unlock(b);

	dm_bm_unlock(b);



	return 0;

}



static void __setup_mapping_info(struct dm_cache_metadata *cmd)
@@ -465,7 +467,9 @@ static int __open_metadata(struct dm_cache_metadata *cmd) 
	dm_disk_bitset_init(cmd->tm, &cmd->discard_info);

	sb_flags = le32_to_cpu(disk_super->flags);

	cmd->clean_when_opened = test_bit(CLEAN_SHUTDOWN, &sb_flags);

	return dm_bm_unlock(sblock);

	dm_bm_unlock(sblock);



	return 0;



bad:

	dm_bm_unlock(sblock);

drivers/md/dm-cache-policy-cleaner.c

+1 −1
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ static struct list_head *list_pop(struct list_head *q) 
static int alloc_hash(struct hash *hash, unsigned elts)

{

	hash->nr_buckets = next_power(elts >> 4, 16);

	hash->hash_bits = ffs(hash->nr_buckets) - 1;

	hash->hash_bits = __ffs(hash->nr_buckets);

	hash->table = vzalloc(sizeof(*hash->table) * hash->nr_buckets);



	return hash->table ? 0 : -ENOMEM;

drivers/md/dm-cache-policy-mq.c

+1 −1
Original line number Diff line number Diff line
@@ -1410,7 +1410,7 @@ static struct dm_cache_policy *mq_create(dm_cblock_t cache_size, 
	mq->generation_period = max((unsigned) from_cblock(cache_size), 1024U);



	mq->nr_buckets = next_power(from_cblock(cache_size) / 2, 16);

	mq->hash_bits = ffs(mq->nr_buckets) - 1;

	mq->hash_bits = __ffs(mq->nr_buckets);

	mq->table = vzalloc(sizeof(*mq->table) * mq->nr_buckets);

	if (!mq->table)

		goto bad_alloc_table;

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