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Subject[RFC PATCH 00/40] Writable overlays (union mounts)
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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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