Btrfs fixes for 4.15-rc3

Hi,

this update contains a few fixes (error handling, quota leak, FUA vs nobarrier mount option). There's one one worth mentioning separately - an off-by-one fix that leads to overwriting first byte of an adjacent page with 0, out of bounds of the memory allocated by an ioctl. This is under a privileged part of the ioctl, can be triggerd in some subvolume layouts.

After the last tags and branches mess [1], let me note that the pull url is pointed to the signed tag. There are no merge conflics. Please pull, thanks.

[1] https://lkml.org/lkml/2017/11/29/952

The following changes since commit ea37d5998b50a72b9045ba60a132eeb20e1c4230:

Btrfs: incremental send, fix wrong unlink path after renaming file (2017-11-28 17:15:30 +0100)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-4.15-rc3-tag

for you to fetch changes up to c8bcbfbd239ed60a6562964b58034ac8a25f4c31:

btrfs: Fix possible off-by-one in btrfs_search_path_in_tree (2017-12-07 00:35:15 +0100)

----------------------------------------------------------------
Jeff Mahoney (2):
btrfs: handle errors while updating refcounts in update_ref_for_cow
btrfs: fix missing error return in btrfs_drop_snapshot

Justin Maggard (1):
btrfs: Fix quota reservation leak on preallocated files

Nikolay Borisov (1):
btrfs: Fix possible off-by-one in btrfs_search_path_in_tree

Omar Sandoval (1):
Btrfs: disable FUA if mounted with nobarrier

 fs/btrfs/ctree.c       | 18 ++++++++++++------
 fs/btrfs/disk-io.c     | 12 +++++-------
 fs/btrfs/extent-tree.c |  1 +
 fs/btrfs/inode.c       |  2 ++
 fs/btrfs/ioctl.c       |  2 +-
 5 files changed, 21 insertions(+), 14 deletions(-)