[git pull] new mount API

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new mount API series from Dave Howells

To quote his cover letter,
	Here are a set of patches to create a filesystem context prior to setting
	up a new mount, populating it with the parsed options/binary data, creating
	the superblock and then effecting the mount.  This is also used for remount
	since much of the parsing stuff is common in many filesystems.

	This allows namespaces and other information to be conveyed through the
	mount procedure.

	This also allows Miklós Szeredi's idea of doing:

		fd = fsopen("nfs");
		fsconfig(fd, FSCONFIG_SET_STRING, "option", "val", 0);
		fsconfig(fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);
		mfd = fsmount(fd, MS_NODEV);
		move_mount(mfd, "", AT_FDCWD, "/mnt", MOVE_MOUNT_F_EMPTY_PATH);

	that he presented at LSF-2017 to be implemented (see the relevant patches
	in the series).

	I didn't use netlink as that would make the core kernel depend on
	CONFIG_NET and CONFIG_NETLINK and would introduce network namespacing
	issues.

	I've implemented filesystem context handling for procfs, nfs, mqueue,
	cpuset, kernfs, sysfs, cgroup and afs filesystems.

	Unconverted filesystems are handled by a legacy filesystem wrapper.

One trivial conflict in fs/file_table.c:__fput(); resolved as
	if (unlikely(mode & FMODE_NEED_UNMOUNT))
		dissolve_on_fput(mnt);
	dput(dentry);
	mntput(mnt);
out:
	file_free(file);

The following changes since commit 32206ab36553be8714d9253ce33f4085681d369c:

  x86/intel_rdt: Provide pseudo-locking hooks within rdt_mount (2018-06-23 12:53:19 +0200)

are available in the git repository at:

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

for you to fetch changes up to 294fb3407bf29abf653fbe169af4bbb38a146db5:

  proc: Set correct userns for new proc super created by a new pid_namespace (2018-08-21 09:28:43 +0100)

----------------------------------------------------------------
Al Viro (2):
      vfs: syscall: Add open_tree(2) to reference or clone a mount
      teach move_mount(2) to work with OPEN_TREE_CLONE

Andrei Vagin (1):
      proc: Set correct userns for new proc super created by a new pid_namespace

David Howells (42):
      vfs: Require specification of size of mount data for internal mounts
      vfs: syscall: Add move_mount(2) to move mounts around
      vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled
      vfs: Introduce the basic header for the new mount API's filesystem context
      vfs: Introduce logging functions
      vfs: Add configuration parser helpers
      vfs: Add LSM hooks for the new mount API
      selinux: Implement the new mount API LSM hooks
      smack: Implement filesystem context security hooks
      apparmor: Implement security hooks for the new mount API
      tomoyo: Implement security hooks for the new mount API
      vfs: Separate changing mount flags full remount
      vfs: Implement a filesystem superblock creation/configuration context
      vfs: Remove unused code after filesystem context changes
      procfs: Move proc_fill_super() to fs/proc/root.c
      proc: Add fs_context support to procfs
      ipc: Convert mqueue fs to fs_context
      cpuset: Use fs_context
      kernfs, sysfs, cgroup, intel_rdt: Support fs_context
      hugetlbfs: Convert to fs_context
      vfs: Remove kern_mount_data()
      vfs: Provide documentation for new mount API
      Make anon_inodes unconditional
      vfs: syscall: Add fsopen() to prepare for superblock creation
      vfs: Implement logging through fs_context
      vfs: Add some logging to the core users of the fs_context log
      vfs: syscall: Add fsconfig() for configuring and managing a context
      vfs: syscall: Add fsmount() to create a mount for a superblock
      vfs: syscall: Add fspick() to select a superblock for reconfiguration
      afs: Add fs_context support
      afs: Use fs_context to pass parameters over automount
      vfs: Add a sample program for the new mount API
      vfs: syscall: Add fsinfo() to query filesystem information
      afs: Add fsinfo support
      vfs: Allow fsinfo() to query what's in an fs_context
      vfs: Allow fsinfo() to be used to query an fs parameter description
      vfs: Implement parameter value retrieval with fsinfo()
      vfs: Fix vfs_dup_fs_context()
      vfs: Fix fs_context logging when there's no log
      afs: Move the source fs parameter to the first position
      vfs: Pass path info fsinfo and rename get_fsinfo sb op to fsinfo
      vfs: Adjust fsinfo sample output

 Documentation/filesystems/mount_api.txt   | 706 ++++++++++++++++++++++++
 arch/arc/kernel/setup.c                   |   1 +
 arch/arm/kernel/atags_parse.c             |   1 +
 arch/arm/kvm/Kconfig                      |   1 -
 arch/arm64/kvm/Kconfig                    |   1 -
 arch/ia64/kernel/perfmon.c                |   3 +-
 arch/mips/kvm/Kconfig                     |   1 -
 arch/powerpc/kvm/Kconfig                  |   1 -
 arch/powerpc/platforms/cell/spufs/inode.c |   6 +-
 arch/s390/hypfs/inode.c                   |   7 +-
 arch/s390/kvm/Kconfig                     |   1 -
 arch/sh/kernel/setup.c                    |   1 +
 arch/sparc/kernel/setup_32.c              |   1 +
 arch/sparc/kernel/setup_64.c              |   1 +
 arch/x86/Kconfig                          |   1 -
 arch/x86/entry/syscalls/syscall_32.tbl    |   7 +
 arch/x86/entry/syscalls/syscall_64.tbl    |   7 +
 arch/x86/kernel/cpu/intel_rdt.h           |  15 +
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c  | 184 ++++---
 arch/x86/kernel/setup.c                   |   1 +
 arch/x86/kvm/Kconfig                      |   1 -
 drivers/base/Kconfig                      |   1 -
 drivers/base/devtmpfs.c                   |   7 +-
 drivers/char/tpm/Kconfig                  |   1 -
 drivers/dax/super.c                       |   2 +-
 drivers/dma-buf/Kconfig                   |   1 -
 drivers/gpio/Kconfig                      |   1 -
 drivers/gpu/drm/drm_drv.c                 |   3 +-
 drivers/gpu/drm/i915/i915_gemfs.c         |   2 +-
 drivers/iio/Kconfig                       |   1 -
 drivers/infiniband/Kconfig                |   1 -
 drivers/infiniband/hw/qib/qib_fs.c        |   7 +-
 drivers/misc/cxl/api.c                    |   3 +-
 drivers/misc/ibmasm/ibmasmfs.c            |  11 +-
 drivers/mtd/mtdsuper.c                    |  26 +-
 drivers/oprofile/oprofilefs.c             |   8 +-
 drivers/scsi/cxlflash/ocxl_hw.c           |   2 +-
 drivers/usb/gadget/function/f_fs.c        |   7 +-
 drivers/usb/gadget/legacy/inode.c         |   7 +-
 drivers/vfio/Kconfig                      |   1 -
 drivers/virtio/virtio_balloon.c           |   2 +-
 drivers/xen/xenfs/super.c                 |   7 +-
 fs/9p/vfs_super.c                         |   2 +-
 fs/Kconfig                                |   7 +
 fs/Makefile                               |   5 +-
 fs/adfs/super.c                           |   9 +-
 fs/affs/super.c                           |  13 +-
 fs/afs/internal.h                         |  10 +-
 fs/afs/mntpt.c                            | 147 ++---
 fs/afs/super.c                            | 634 +++++++++++++--------
 fs/afs/volume.c                           |   4 +-
 fs/aio.c                                  |   3 +-
 fs/anon_inodes.c                          |   3 +-
 fs/autofs/autofs_i.h                      |   2 +-
 fs/autofs/init.c                          |   4 +-
 fs/autofs/inode.c                         |   3 +-
 fs/befs/linuxvfs.c                        |  11 +-
 fs/bfs/inode.c                            |   8 +-
 fs/binfmt_misc.c                          |   7 +-
 fs/block_dev.c                            |   2 +-
 fs/btrfs/super.c                          |  30 +-
 fs/btrfs/tests/btrfs-tests.c              |   2 +-
 fs/ceph/super.c                           |   3 +-
 fs/cifs/cifs_dfs_ref.c                    |   3 +-
 fs/cifs/cifsfs.c                          |  18 +-
 fs/coda/inode.c                           |  11 +-
 fs/configfs/mount.c                       |   7 +-
 fs/cramfs/inode.c                         |  17 +-
 fs/debugfs/inode.c                        |  14 +-
 fs/devpts/inode.c                         |  10 +-
 fs/ecryptfs/main.c                        |   2 +-
 fs/efivarfs/super.c                       |   9 +-
 fs/efs/super.c                            |  14 +-
 fs/exofs/super.c                          |   7 +-
 fs/ext2/super.c                           |  14 +-
 fs/ext4/super.c                           |  16 +-
 fs/f2fs/super.c                           |  13 +-
 fs/fat/inode.c                            |   3 +-
 fs/fat/namei_msdos.c                      |   8 +-
 fs/fat/namei_vfat.c                       |   8 +-
 fs/file_table.c                           |   9 +-
 fs/filesystems.c                          |   4 +
 fs/freevxfs/vxfs_super.c                  |  12 +-
 fs/fs_context.c                           | 779 ++++++++++++++++++++++++++
 fs/fs_parser.c                            | 483 ++++++++++++++++
 fs/fsopen.c                               | 491 +++++++++++++++++
 fs/fuse/control.c                         |   9 +-
 fs/fuse/inode.c                           |  16 +-
 fs/gfs2/ops_fstype.c                      |   6 +-
 fs/gfs2/super.c                           |   4 +-
 fs/hfs/super.c                            |  12 +-
 fs/hfsplus/super.c                        |  12 +-
 fs/hostfs/hostfs_kern.c                   |   7 +-
 fs/hpfs/super.c                           |  11 +-
 fs/hugetlbfs/inode.c                      | 455 ++++++++++------
 fs/internal.h                             |  13 +-
 fs/isofs/inode.c                          |  11 +-
 fs/jffs2/super.c                          |  10 +-
 fs/jfs/super.c                            |  11 +-
 fs/kernfs/mount.c                         | 102 ++--
 fs/libfs.c                                |  19 +-
 fs/minix/inode.c                          |  14 +-
 fs/namei.c                                |   4 +-
 fs/namespace.c                            | 879 ++++++++++++++++++++++--------
 fs/nfs/internal.h                         |   4 +-
 fs/nfs/namespace.c                        |   3 +-
 fs/nfs/nfs4namespace.c                    |   3 +-
 fs/nfs/nfs4super.c                        |  27 +-
 fs/nfs/super.c                            |  22 +-
 fs/nfsd/nfsctl.c                          |   8 +-
 fs/nilfs2/super.c                         |  10 +-
 fs/notify/fanotify/Kconfig                |   1 -
 fs/notify/inotify/Kconfig                 |   1 -
 fs/nsfs.c                                 |   3 +-
 fs/ntfs/super.c                           |  13 +-
 fs/ocfs2/dlmfs/dlmfs.c                    |   5 +-
 fs/ocfs2/super.c                          |  14 +-
 fs/omfs/inode.c                           |   9 +-
 fs/openpromfs/inode.c                     |  11 +-
 fs/orangefs/orangefs-kernel.h             |   2 +-
 fs/orangefs/super.c                       |   5 +-
 fs/overlayfs/super.c                      |  11 +-
 fs/pipe.c                                 |   3 +-
 fs/pnode.c                                |   1 +
 fs/proc/inode.c                           |  50 +-
 fs/proc/internal.h                        |   6 +-
 fs/proc/root.c                            | 247 ++++++---
 fs/pstore/inode.c                         |  10 +-
 fs/qnx4/inode.c                           |  14 +-
 fs/qnx6/inode.c                           |  14 +-
 fs/ramfs/inode.c                          |   6 +-
 fs/reiserfs/super.c                       |  14 +-
 fs/romfs/super.c                          |  13 +-
 fs/squashfs/super.c                       |  12 +-
 fs/statfs.c                               | 571 +++++++++++++++++++
 fs/super.c                                | 397 +++++++++++---
 fs/sysfs/mount.c                          |  67 ++-
 fs/sysv/inode.c                           |   3 +-
 fs/sysv/super.c                           |  16 +-
 fs/tracefs/inode.c                        |  10 +-
 fs/ubifs/super.c                          |   5 +-
 fs/udf/super.c                            |  16 +-
 fs/ufs/super.c                            |  11 +-
 fs/xfs/xfs_super.c                        |  10 +-
 include/linux/cgroup.h                    |   3 +-
 include/linux/debugfs.h                   |   8 +-
 include/linux/fs.h                        |  50 +-
 include/linux/fs_context.h                | 208 +++++++
 include/linux/fs_parser.h                 | 117 ++++
 include/linux/fsinfo.h                    |  41 ++
 include/linux/kernfs.h                    |  41 +-
 include/linux/lsm_hooks.h                 |  79 ++-
 include/linux/module.h                    |   6 +
 include/linux/mount.h                     |  10 +-
 include/linux/mtd/super.h                 |   4 +-
 include/linux/ramfs.h                     |   4 +-
 include/linux/security.h                  |  72 ++-
 include/linux/shmem_fs.h                  |   3 +-
 include/linux/syscalls.h                  |  13 +
 include/uapi/linux/fcntl.h                |   2 +
 include/uapi/linux/fs.h                   |  82 ++-
 include/uapi/linux/fsinfo.h               | 302 ++++++++++
 include/uapi/linux/mount.h                |  75 +++
 init/Kconfig                              |  10 -
 init/do_mounts.c                          |   5 +-
 init/do_mounts_initrd.c                   |   1 +
 ipc/mqueue.c                              | 120 +++-
 kernel/bpf/inode.c                        |   7 +-
 kernel/cgroup/cgroup-internal.h           |  50 +-
 kernel/cgroup/cgroup-v1.c                 | 415 ++++++++------
 kernel/cgroup/cgroup.c                    | 285 +++++++---
 kernel/cgroup/cpuset.c                    |  67 ++-
 kernel/trace/trace.c                      |   7 +-
 mm/shmem.c                                |  10 +-
 mm/zsmalloc.c                             |   3 +-
 net/socket.c                              |   3 +-
 net/sunrpc/rpc_pipe.c                     |   7 +-
 samples/Kconfig                           |   6 +
 samples/Makefile                          |   2 +-
 samples/mount_api/Makefile                |   7 +
 samples/mount_api/test-fsmount.c          | 118 ++++
 samples/statx/Makefile                    |   7 +-
 samples/statx/test-fs-query.c             | 137 +++++
 samples/statx/test-fsinfo.c               | 584 ++++++++++++++++++++
 security/apparmor/apparmorfs.c            |   8 +-
 security/apparmor/include/mount.h         |  11 +-
 security/apparmor/lsm.c                   | 111 +++-
 security/apparmor/mount.c                 |  47 ++
 security/inode.c                          |   7 +-
 security/security.c                       |  65 ++-
 security/selinux/hooks.c                  | 320 ++++++++++-
 security/selinux/selinuxfs.c              |   8 +-
 security/smack/smack.h                    |  11 +-
 security/smack/smack_lsm.c                | 373 +++++++++++--
 security/smack/smackfs.c                  |   9 +-
 security/tomoyo/common.h                  |   3 +
 security/tomoyo/mount.c                   |  46 ++
 security/tomoyo/tomoyo.c                  |  19 +-
 198 files changed, 9288 insertions(+), 1874 deletions(-)
 create mode 100644 Documentation/filesystems/mount_api.txt
 create mode 100644 fs/fs_context.c
 create mode 100644 fs/fs_parser.c
 create mode 100644 fs/fsopen.c
 create mode 100644 include/linux/fs_context.h
 create mode 100644 include/linux/fs_parser.h
 create mode 100644 include/linux/fsinfo.h
 create mode 100644 include/uapi/linux/fsinfo.h
 create mode 100644 include/uapi/linux/mount.h
 create mode 100644 samples/mount_api/Makefile
 create mode 100644 samples/mount_api/test-fsmount.c
 create mode 100644 samples/statx/test-fs-query.c
 create mode 100644 samples/statx/test-fsinfo.c



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