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    Subject[PATCH 00/35] Union mounts - everything but the xattrs
    Date
    This patch series implements union mounts for every system call
    except:

    - xattr-related calls
    - fchmod()/fchown()/futimensat() on an fd

    The copyup portion is a proof of concept based around union_path_nd(),
    which looks up both the target <mnt,dentry> pair and its parent's. If
    the parent is on a union mount, and the target is on a lower layer, we
    copy up the target.

    This patch set is very raw and could use even the most superficial
    review. Just take a look at Erez's review from December to see how
    low-hanging the fruit is on this one.

    -VAL

    Felix Fietkau (2):
    whiteout: jffs2 whiteout support
    fallthru: jffs2 fallthru support

    Jan Blunck (13):
    VFS: Make lookup_hash() return a struct path
    XXX autofs4: Save autofs trigger's vfsmount in super block info
    whiteout/NFSD: Don't return information about whiteouts to userspace
    whiteout: Add vfs_whiteout() and whiteout inode operation
    whiteout: Set S_OPAQUE inode flag when creating directories
    whiteout: Allow removal of a directory with whiteouts
    whiteout: tmpfs whiteout support
    whiteout: Split of ext2_append_link() from ext2_add_link()
    whiteout: ext2 whiteout support
    union-mount: Introduce MNT_UNION and MS_UNION flags
    union-mount: Introduce union_mount structure and basic operations
    union-mount: Drive the union cache via dcache
    union-mount: Call do_whiteout() on unlink and rmdir in unions

    Valerie Aurora (20):
    VFS: Add read-only users count to superblock
    fallthru: Basic fallthru definitions
    fallthru: ext2 fallthru support
    fallthru: tmpfs fallthru support
    union-mount: Writable overlays/union mounts documentation
    union-mount: Implement union lookup
    union-mount: Support for mounting union mount file systems
    union-mount: Copy up directory entries on first readdir()
    VFS: Split inode_permission() and create path_permission()
    VFS: Create user_path_nd() to lookup both parent and target
    union-mount: In-kernel copyup routines
    union-mount: Implement union-aware access()/faccessat()
    union-mount: Implement union-aware link()
    union-mount: Implement union-aware rename()
    union-mount: Implement union-aware writable open()
    union-mount: Implement union-aware chown()
    union-mount: Implement union-aware truncate()
    union-mount: Implement union-aware chmod()/fchmodat()
    union-mount: Implement union-aware lchown()
    union-mount: Implement union-aware utimensat()

    Documentation/filesystems/union-mounts.txt | 708 ++++++++++++++++++++++
    Documentation/filesystems/vfs.txt | 16 +-
    fs/Kconfig | 13 +
    fs/Makefile | 1 +
    fs/autofs4/autofs_i.h | 1 +
    fs/autofs4/init.c | 11 +-
    fs/autofs4/root.c | 6 +
    fs/compat.c | 9 +
    fs/dcache.c | 35 +-
    fs/ext2/dir.c | 248 +++++++-
    fs/ext2/ext2.h | 4 +
    fs/ext2/inode.c | 11 +-
    fs/ext2/namei.c | 89 +++-
    fs/ext2/super.c | 6 +
    fs/jffs2/dir.c | 104 ++++-
    fs/jffs2/fs.c | 4 +
    fs/jffs2/super.c | 2 +-
    fs/libfs.c | 21 +-
    fs/namei.c | 793 ++++++++++++++++++++++---
    fs/namespace.c | 146 +++++-
    fs/nfsd/nfs3xdr.c | 5 +
    fs/nfsd/nfs4xdr.c | 5 +
    fs/nfsd/nfsxdr.c | 4 +
    fs/open.c | 116 +++-
    fs/readdir.c | 18 +
    fs/super.c | 23 +
    fs/union.c | 881 ++++++++++++++++++++++++++++
    fs/utimes.c | 13 +-
    include/linux/dcache.h | 40 ++
    include/linux/ext2_fs.h | 5 +
    include/linux/fs.h | 16 +
    include/linux/jffs2.h | 8 +
    include/linux/mount.h | 7 +-
    include/linux/namei.h | 2 +
    include/linux/union.h | 77 +++
    mm/shmem.c | 195 ++++++-
    36 files changed, 3483 insertions(+), 160 deletions(-)
    create mode 100644 Documentation/filesystems/union-mounts.txt
    create mode 100644 fs/union.c
    create mode 100644 include/linux/union.h



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