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    Subject[RFC PATCH 00/40] Writable overlays (union mounts)
    Date
    Here is the current patch set for writable overlays (union mounts).
    It needs lots of review! Especially the bits where we do nasty things
    with readdir().

    Writable overlays let you mount one read-write file system
    transparently over another read-only file system. This is useful for
    things like LiveCDs. Detailed documentation and HOWTO here:

    http://valerieaurora.org/union/

    The git version is in branch "overlay" of:

    http://git.kernel.org/?p=linux/kernel/git/val/linux-2.6.git;a=summary

    Call for maintainer: Neither Jan nor I can give this patch set the
    long term love that it needs. If you are interested in becoming the
    maintainer for union mounts at some point in the future, please drop
    me an email.

    -VAL

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

    Jan Blunck (25):
    VFS: BUG() if somebody tries to rehash an already hashed dentry
    VFS: propagate mnt_flags into do_loopback
    VFS: Make lookup_hash() return a struct path
    VFS: Remove unnecessary micro-optimization in cached_lookup()
    VFS: Make real_lookup() return a struct path
    VFS: Introduce dput() variant that maintains a kill-list
    Don't replace nameidata path when following links
    whiteout: 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
    union-mount: Allow removal of a directory
    whiteout: tmpfs whiteout support
    whiteout: Split of ext2_append_link() from ext2_add_link()
    whiteout: ext2 whiteout support
    whiteout: Add path_whiteout() helper
    union-mount: Introduce MNT_UNION and MS_UNION flags
    union-mount: Introduce union_mount structure
    union-mount: Drive the union cache via dcache
    union-mount: Some checks during namespace changes
    union-mount: Changes to the namespace handling
    union-mount: Make lookup work for union-mounted file systems
    union-mount: stop lookup when directory has S_OPAQUE flag set
    union-mount: stop lookup when finding a whiteout
    union-mount: call do_whiteout() on unlink and rmdir
    union-mount: Add support for rename by __union_copyup()

    Valerie Aurora (14):
    VFS: Add read-only users count to superblock
    union-mount: Documentation
    union-mount: in-kernel file copy between union mounted filesystems
    union-mount: Always create topmost directory on open
    fallthru: Basic fallthru definitions
    fallthru: Support for fallthru entries in union mount lookup
    fallthru: ext2 fallthru support
    fallthru: tmpfs fallthru support
    union-mount: Copy up directory entries on first readdir()
    union-mount: Increment read-only users count for read-only layer
    union-mount: Check read-only/read-write status of layers
    union-mount: Make pivot_root work with union mounts
    union-mount: Ignore read-only file system in permission checks
    union-mount: Make truncate work in all its glorious UNIX variations

    Documentation/filesystems/union-mounts.txt | 708 ++++++++++++++
    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 | 143 +++-
    fs/ext2/dir.c | 248 +++++-
    fs/ext2/ext2.h | 4 +
    fs/ext2/inode.c | 11 +-
    fs/ext2/namei.c | 85 ++-
    fs/ext2/super.c | 7 +
    fs/jffs2/dir.c | 108 ++-
    fs/jffs2/fs.c | 4 +
    fs/jffs2/super.c | 2 +-
    fs/libfs.c | 21 +-
    fs/namei.c | 1424 +++++++++++++++++++++++++---
    fs/namespace.c | 120 +++-
    fs/nfsctl.c | 6 +-
    fs/nfsd/nfs3xdr.c | 5 +
    fs/nfsd/nfs4xdr.c | 2 +-
    fs/nfsd/nfsxdr.c | 4 +
    fs/open.c | 130 +--
    fs/readdir.c | 26 +
    fs/super.c | 14 +
    fs/union.c | 978 +++++++++++++++++++
    include/linux/dcache.h | 29 +
    include/linux/ext2_fs.h | 5 +
    include/linux/fs.h | 15 +-
    include/linux/jffs2.h | 8 +
    include/linux/mount.h | 4 +
    include/linux/namei.h | 6 +
    include/linux/union.h | 84 ++
    mm/shmem.c | 195 ++++-
    35 files changed, 4172 insertions(+), 265 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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