[git pull] work.mount - infrastructure

[Al Viro]

	Infrastructure bits of mount API conversions; the rest is
more of per-filesystem patches and it'll go in a separate pull
request.  Requests, actually, since some are (thankfully) in
the individual filesystem trees now (a huge NFS pile, for example).

The following changes since commit d1abaeb3be7b5fa6d7a1fbbd2e14e3310005c4c1:

  Linux 5.3-rc5 (2019-08-18 14:31:08 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.mount-base

for you to fetch changes up to 0f071004109d9c8de7023b9a64fa2ba3fa87cbed:

  mtd: Provide fs_context-aware mount_mtd() replacement (2019-09-05 14:34:23 -0400)

----------------------------------------------------------------
Al Viro (1):
      new helper: get_tree_keyed()

David Howells (2):
      vfs: Create fs_context-aware mount_bdev() replacement
      mtd: Provide fs_context-aware mount_mtd() replacement

Eric Biggers (1):
      vfs: set fs_context::user_ns for reconfigure

 drivers/mtd/mtdcore.h      |   1 +
 drivers/mtd/mtdsuper.c     | 179 ++++++++++++++++++++++++++++++++++++++++++++-
 fs/fs_context.c            |   4 +-
 fs/nfsd/nfsctl.c           |   3 +-
 fs/proc/root.c             |   3 +-
 fs/super.c                 | 104 ++++++++++++++++++++++++++
 include/linux/fs_context.h |  12 ++-
 include/linux/mtd/super.h  |   3 +
 ipc/mqueue.c               |   3 +-
 net/sunrpc/rpc_pipe.c      |   3 +-
 10 files changed, 301 insertions(+), 14 deletions(-)