vfs: spread struct mount - mnt_has_parent
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index 64c8ce4..1834e71 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2460,8 +2460,9 @@
struct dentry * parent;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
+ struct mount *mnt = real_mount(vfsmnt);
/* Global root? */
- if (!mnt_has_parent(vfsmnt))
+ if (!mnt_has_parent(mnt))
goto global_root;
dentry = vfsmnt->mnt_mountpoint;
vfsmnt = vfsmnt->mnt_parent;
diff --git a/fs/mount.h b/fs/mount.h
index 831e7c8..541daf5 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -10,9 +10,9 @@
return container_of(mnt, struct mount, mnt);
}
-static inline int mnt_has_parent(struct vfsmount *mnt)
+static inline int mnt_has_parent(struct mount *mnt)
{
- return mnt != mnt->mnt_parent;
+ return &mnt->mnt != mnt->mnt.mnt_parent;
}
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
diff --git a/fs/namespace.c b/fs/namespace.c
index 17927f9..ced3aa5 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1195,7 +1195,7 @@
while (!list_empty(head)) {
mnt = list_first_entry(head, struct mount, mnt_hash);
list_del_init(&mnt->mnt_hash);
- if (mnt_has_parent(&mnt->mnt)) {
+ if (mnt_has_parent(mnt)) {
struct dentry *dentry;
struct vfsmount *m;
@@ -1235,7 +1235,7 @@
p->mnt.mnt_ns = NULL;
__mnt_make_shortterm(&p->mnt);
list_del_init(&p->mnt.mnt_child);
- if (mnt_has_parent(&p->mnt)) {
+ if (mnt_has_parent(p)) {
p->mnt.mnt_parent->mnt_ghosts++;
dentry_reset_mounted(p->mnt.mnt_mountpoint);
}
@@ -1861,7 +1861,7 @@
static int do_move_mount(struct path *path, char *old_name)
{
struct path old_path, parent_path;
- struct vfsmount *p;
+ struct mount *p;
struct mount *old;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
@@ -1889,7 +1889,7 @@
old = real_mount(old_path.mnt);
- if (!mnt_has_parent(old_path.mnt))
+ if (!mnt_has_parent(old))
goto out1;
if (S_ISDIR(path->dentry->d_inode->i_mode) !=
@@ -1908,8 +1908,8 @@
tree_contains_unbindable(old))
goto out1;
err = -ELOOP;
- for (p = path->mnt; mnt_has_parent(p); p = p->mnt_parent)
- if (p == old_path.mnt)
+ for (p = real_mount(path->mnt); mnt_has_parent(p); p = real_mount(p->mnt.mnt_parent))
+ if (p == old)
goto out1;
err = attach_recursive_mnt(old, path, &parent_path);
@@ -2562,7 +2562,7 @@
bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
const struct path *root)
{
- while (mnt != root->mnt && mnt_has_parent(mnt)) {
+ while (mnt != root->mnt && mnt_has_parent(real_mount(mnt))) {
dentry = mnt->mnt_mountpoint;
mnt = mnt->mnt_parent;
}
@@ -2652,11 +2652,11 @@
error = -EINVAL;
if (root.mnt->mnt_root != root.dentry)
goto out4; /* not a mountpoint */
- if (!mnt_has_parent(root.mnt))
+ if (!mnt_has_parent(root_mnt))
goto out4; /* not attached */
if (new.mnt->mnt_root != new.dentry)
goto out4; /* not a mountpoint */
- if (!mnt_has_parent(new.mnt))
+ if (!mnt_has_parent(new_mnt))
goto out4; /* not attached */
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(old.mnt, old.dentry, &new))
