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Subject[PATCH] fs: bound mount propagation fix
Date
I think MS_SILENT shouldn't be cleared anywhere. I suppose the bug is in 
MS_SHARED options checking. Please see the patch below.

Fixed MS_SHARED, MS_SLAVE, MS_UNBINDABLE option handling;
Existing options check doesn't allow to have any options combinations
because of integer comparison (not bitwise).
Signed-off-by: Roman Borisov <ext-roman.borisov@nokia.com>
---
fs/namespace.c | 2 +-
fs/pnode.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 2beb0fb..e0cf263 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1434,7 +1434,7 @@ static int do_change_type(struct path *path, int flag)
return -EINVAL;

down_write(&namespace_sem);
- if (type == MS_SHARED) {
+ if (type & MS_SHARED) {
err = invent_group_ids(mnt, recurse);
if (err)
goto out_unlock;
diff --git a/fs/pnode.c b/fs/pnode.c
index 8d5f392..0c9dc54 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -128,15 +128,15 @@ static int do_make_slave(struct vfsmount *mnt)

void change_mnt_propagation(struct vfsmount *mnt, int type)
{
- if (type == MS_SHARED) {
+ if (type & MS_SHARED) {
set_mnt_shared(mnt);
return;
}
do_make_slave(mnt);
- if (type != MS_SLAVE) {
+ if (!(type & MS_SLAVE)) {
list_del_init(&mnt->mnt_slave);
mnt->mnt_master = NULL;
- if (type == MS_UNBINDABLE)
+ if (type & MS_UNBINDABLE)
mnt->mnt_flags |= MNT_UNBINDABLE;
else
mnt->mnt_flags &= ~MNT_UNBINDABLE;
--
1.7.0.4


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