The object of this series is to replace shiftfs with a proper uid/gid shifting bind mount instead of the shiftfs hack of introducing something that looks similar to an overlay filesystem to do it. The VFS still has the problem that in order to tell what vfsmount a dentry belongs to, struct path would have to be threaded everywhere struct dentry currently is. However, this patch is structured only to require a rethreading of notify_change. The rest of the knowledge that a shift is in operation is carried in the task structure by caching the unshifted credentials. The only real change from v1 is that the notify_change patch is updated to fix the issues pointed out by Amir Goldstein. And I've combined the precursor patch to rethread notify_changes into the series. James --- James Bottomley (3): fs: rethread notify_change to take a path instead of a dentry fs: introduce uid/gid shifting bind mount fs: expose shifting bind mount to userspace drivers/base/devtmpfs.c | 8 +++- fs/attr.c | 91 ++++++++++++++++++++++++++++---------- fs/bind.c | 35 +++++++++++++++ fs/cachefiles/interface.c | 6 ++- fs/coredump.c | 4 +- fs/ecryptfs/inode.c | 9 ++-- fs/exec.c | 7 ++- fs/inode.c | 16 ++++--- fs/internal.h | 2 + fs/mount.h | 2 + fs/namei.c | 110 ++++++++++++++++++++++++++++++++++++++-------- fs/namespace.c | 1 + fs/nfsd/vfs.c | 13 +++--- fs/open.c | 44 ++++++++++++++----- fs/overlayfs/copy_up.c | 40 ++++++++++------- fs/overlayfs/dir.c | 10 ++++- fs/overlayfs/inode.c | 6 ++- fs/overlayfs/overlayfs.h | 2 +- fs/overlayfs/super.c | 3 +- fs/posix_acl.c | 4 +- fs/proc_namespace.c | 4 ++ fs/stat.c | 31 +++++++++++-- fs/utimes.c | 2 +- include/linux/cred.h | 10 +++++ include/linux/fs.h | 6 +-- include/linux/mount.h | 4 +- include/linux/sched.h | 5 +++ kernel/capability.c | 14 +++++- kernel/cred.c | 20 +++++++++ kernel/groups.c | 7 +++ 30 files changed, 408 insertions(+), 108 deletions(-) -- 2.16.4
