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Subject[PATCH 00/38] Union mounts - union stack as linked list
Date
This version of union mounts implements two major changes requested by
Al Viro:

* Drastically simplify the union stack for a directory. It is now a
singly linked list rooted in the dentry of the topmost directory,
instead of a set of path -> path mappings kept in a hash table. The
union hash table lookup routines have gone away, along with most of
struct union_dir.

* On union mount, clone the underlying read-only mounts and keep them
in a list hanging off the superblock of the topmost file system.

It also includes many other minor fixups, but those are the big
changes.

Patches are against 2.6.34. Git version is in branch "linked_list" of:

git://git.kernel.org/pub/scm/linux/kernel/git/val/linux-2.6.git

Next up: Rewrite user_path_nd() and associated code, and implement the
rest of Al Viro's code review comments.

-VAL

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

Jan Blunck (11):
VFS: Make lookup_hash() return a struct path
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: Call do_whiteout() on unlink and rmdir in unions

Valerie Aurora (25):
VFS: Comment follow_mount() and friends
VFS: Add read-only users count to superblock
fallthru: Basic fallthru definitions
fallthru: ext2 fallthru support
fallthru: tmpfs fallthru support
union-mount: Union mounts documentation
union-mount: Introduce union_dir structure and basic operations
union-mount: Free union dirs on removal from dcache
union-mount: Support for mounting union mount file systems
union-mount: Implement union lookup
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 file 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()
union-mount: Implement union-aware setxattr()
union-mount: Implement union-aware lsetxattr()

Documentation/filesystems/union-mounts.txt | 759 ++++++++++++++++++++++++++++
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 | 32 ++-
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 | 751 ++++++++++++++++++++++++----
fs/namespace.c | 263 ++++++++++-
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 | 24 +
fs/union.c | 693 +++++++++++++++++++++++++
fs/union.h | 80 +++
fs/utimes.c | 14 +-
fs/xattr.c | 65 ++-
include/linux/dcache.h | 16 +-
include/linux/ext2_fs.h | 5 +
include/linux/fs.h | 20 +
include/linux/jffs2.h | 8 +
include/linux/mount.h | 6 +-
include/linux/namei.h | 2 +
mm/shmem.c | 195 +++++++-
37 files changed, 3445 insertions(+), 182 deletions(-)
create mode 100644 Documentation/filesystems/union-mounts.txt
create mode 100644 fs/union.c
create mode 100644 fs/union.h



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