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    Subject[GIT PULL] overlayfs update for 4.16
    Hi Linus,

    Please pull from:

    git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-linus

    This work from Amir adds NFS export capability to overlayfs. NFS exporting an
    overlay filesystem is a challange because we want to keep track of any copy-up
    of a file or directory between encoding the file handle and decoding it.

    This is achieved by indexing copied up objects by lower layer file handle. The
    index is already used for hard links, this patchset extends the use to NFS file
    handle decoding.

    There's a VFS patch that splits out d_instantiate_anon() from d_obtain_alias().
    This is needed because overlayfs allocates d_fsdata for its dentries, so the
    plain d_alloc_anon() call in d_obtain_alias() is not sufficient to create a
    fully initialized overlay dentry. The patch conflicts with f1ee616214cb ("VFS:
    don't keep disconnected dentries on d_anon"); fixup by "s/tmp/dentry/g" on the
    upstream version.

    Thanks,
    Miklos

    ---
    Amir Goldstein (50):
    ovl: hash directory inodes for fsnotify
    ovl: fix failure to fsync lower dir
    ovl: take lower dir inode mutex outside upper sb_writers lock
    ovl: fix another overlay: warning prefix
    ovl: take mnt_want_write() for work/index dir setup
    ovl: take mnt_want_write() for removing impure xattr
    ovl: fix inconsistent d_ino for legacy merge dir
    ovl: disable index when no xattr support
    ovl: force r/o mount when index dir creation fails
    ovl: store layer index in ovl_layer
    ovl: factor out ovl_check_origin_fh()
    ovl: simplify arguments to ovl_check_origin_fh()
    ovl: generalize ovl_verify_origin() and helpers
    ovl: update documentation of inodes index feature
    ovl: add support for "nfs_export" configuration
    ovl: verify stored origin fh matches lower dir
    ovl: unbless lower st_ino of unverified origin
    ovl: use directory index entries for consistency verification
    ovl: verify whiteout index entries on mount
    ovl: verify directory index entries on mount
    ovl: cleanup temp index entries
    ovl: create ovl_need_index() helper
    ovl: index all non-dir on copy up for NFS export
    ovl: index directories on copy up for NFS export
    ovl: cleanup dir index when dir nlink drops to zero
    ovl: whiteout index when union nlink drops to zero
    ovl: whiteout orphan index entries on mount
    ovl: factor out ovl_get_index_fh() helper
    ovl: do not pass overlay dentry to ovl_get_inode()
    ovl: use d_splice_alias() in place of d_add() in lookup
    ovl: copy up of disconnected dentries
    ovl: store 'has_upper' and 'opaque' as bit flags
    ovl: document NFS export
    ovl: encode pure upper file handles
    ovl: decode pure upper file handles
    ovl: decode connected upper dir file handles
    ovl: encode non-indexed upper file handles
    ovl: copy up before encoding non-connectable dir file handle
    ovl: encode lower file handles
    ovl: decode lower non-dir file handles
    ovl: decode indexed non-dir file handles
    ovl: decode lower file handles of unlinked but open files
    ovl: decode indexed dir file handles
    ovl: decode pure lower dir file handles
    ovl: hash non-indexed dir by upper inode for NFS export
    ovl: lookup connected ancestor of dir in inode cache
    ovl: lookup indexed ancestor of lower dir
    ovl: wire up NFS export operations
    ovl: fix regression in fsnotify of overlay merge dir
    ovl: check ERR_PTR() return value from ovl_encode_fh()

    Miklos Szeredi (1):
    vfs: factor out helpers d_instantiate_anon() and d_alloc_anon()

    ---
    Documentation/filesystems/overlayfs.txt | 106 ++++-
    fs/dcache.c | 88 ++--
    fs/overlayfs/Kconfig | 31 +-
    fs/overlayfs/Makefile | 3 +-
    fs/overlayfs/copy_up.c | 188 +++++++--
    fs/overlayfs/dir.c | 175 ++++----
    fs/overlayfs/export.c | 715 ++++++++++++++++++++++++++++++++
    fs/overlayfs/inode.c | 106 +++--
    fs/overlayfs/namei.c | 533 +++++++++++++++++-------
    fs/overlayfs/overlayfs.h | 66 ++-
    fs/overlayfs/ovl_entry.h | 11 +-
    fs/overlayfs/readdir.c | 57 ++-
    fs/overlayfs/super.c | 125 ++++--
    fs/overlayfs/util.c | 108 +++--
    include/linux/dcache.h | 2 +
    15 files changed, 1905 insertions(+), 409 deletions(-)
    create mode 100644 fs/overlayfs/export.c

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