device mapper fixes for 5.4-rc4

Hi Linus,

The following changes since commit da0c9ea146cbe92b832f1b0f694840ea8eb33cce:

Linux 5.4-rc2 (2019-10-06 14:27:30 -0700)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git tags/for-5.4/dm-fixes

for you to fetch changes up to 13bd677a472d534bf100bab2713efc3f9e3f5978:

dm cache: fix bugs when a GFP_NOWAIT allocation fails (2019-10-17 11:13:50 -0400)

Please pull, thanks.
Mike

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- Fix DM snapshot deadlock that can occur due to COW throttling preventing locks from being released.

- Fix DM cache's GFP_NOWAIT allocation failure error paths by switching to GFP_NOIO.

- Make __hash_find() static in the DM clone target.

----------------------------------------------------------------
Mikulas Patocka (3):
dm snapshot: introduce account_start_copy() and account_end_copy() dm snapshot: rework COW throttling to fix deadlock
dm cache: fix bugs when a GFP_NOWAIT allocation fails

YueHaibing (1):
dm clone: Make __hash_find static

 drivers/md/dm-cache-target.c | 28 +------------
 drivers/md/dm-clone-target.c |  4 +-
 drivers/md/dm-snap.c         | 94 ++++++++++++++++++++++++++++++++++++--------
 3 files changed, 81 insertions(+), 45 deletions(-)