device mapper fixes for 4.20

Hi Linus,

The following changes since commit 2595646791c319cadfdbf271563aac97d0843dc7:

Linux 4.20-rc5 (2018-12-02 15:07:55 -0800)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git tags/for-4.20/dm-fixes

for you to fetch changes up to 2af6c0703d75fc3ff2e6de19b4b3adab96acc12d:

dm thin: bump target version (2018-12-12 09:39:54 -0500)

Please pull, thanks.
Mike

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- Fix DM cache metadata to verify that a cache has block before trying to continue with operation that requires them.

- Fix bio-based DM core's dm_make_request() to properly impose device limits on individual bios by making use of blk_queue_split().

- Fix long-standing race with how DM thinp notified userspace of thin-pool mode state changes before they were actually made.

- Fix the zoned target's bio completion handling; this is a fairly invassive fix at this stage but it is localized to the zoned target. Any zoned target users will benefit from this fix.

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Damien Le Moal (1):
dm zoned: Fix target BIO completion handling

Mike Snitzer (4):
dm cache metadata: verify cache has blocks in blocks_are_clean_separate_dirty()
dm: call blk_queue_split() to impose device limits on bios
dm thin: send event about thin-pool state change _after_ making it dm thin: bump target version

 drivers/md/dm-cache-metadata.c |   4 ++
 drivers/md/dm-thin.c           |  72 ++++++++++++------------
 drivers/md/dm-zoned-target.c   | 122 +++++++++++++----------------------------
 drivers/md/dm.c                |   2 +
 4 files changed, 81 insertions(+), 119 deletions(-)