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Subject[PATCH 0/11] Detaching mounts on unlink

The last round of this patchset the semantics of dropping mounts on
unlink were agreed upon so long as we preserve the current semantics in
a single mount namespace.

There are two big changes with this version of the patchset.
1) The test for a mount in the current mount namespace has been
rewritten so that it is actually correct and is now a drop in
replacement for d_mountpoint. Removing the need for code changes
that could cause unitended regressions.

2) This work has been comprehensivly extend to d_revalidate and
d_invalidate allowing some long standing bugs to be fixed at the end
of this patch series.

In net this should result in a kernel that is more comprehensible and
maintainble as well as fixing some possible mount leaks, and removing
the possibility of DOS attacks from evily placed mount points, in other
mount namespaces.

Eric W. Biederman (11):
vfs: Document the effect of d_revalidate on d_find_alias
vfs: More precise tests in d_invalidate
vfs: Don't allow overwriting mounts in the current mount namespace
vfs: Keep a list of mounts on a mount point
vfs: Add a function to lazily unmount all mounts from any dentry.
vfs: Lazily remove mounts on unlinked files and directories.
vfs: Remove unnecessary calls of check_submounts_and_drop
vfs: Merge check_submounts_and_drop and d_invalidate
vfs: Make d_invalidate return void
vfs: Remove d_drop calls from d_revalidate implementations
proc: Update proc_flush_task_mnt to use d_invalidate

fs/afs/dir.c | 5 --
fs/btrfs/ioctl.c | 5 +--
fs/ceph/dir.c | 1 -
fs/cifs/readdir.c | 6 +--
fs/dcache.c | 140 +++++++++++++++++-------------------------------
fs/fuse/dir.c | 7 +--
fs/gfs2/dentry.c | 3 -
fs/kernfs/dir.c | 11 ----
fs/mount.h | 13 +++++
fs/namei.c | 28 ++++++----
fs/namespace.c | 80 +++++++++++++++++++++++++++
fs/nfs/dir.c | 7 +--
fs/proc/base.c | 10 +---
fs/proc/fd.c | 2 -
include/linux/dcache.h | 3 +-
15 files changed, 167 insertions(+), 154 deletions(-)

Eric


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