vfs: spread struct mount - remaining argument of next_mnt()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namespace.c b/fs/namespace.c
index 124a125..24e8456 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -631,12 +631,12 @@ static void commit_tree(struct mount *mnt)
        touch_mnt_namespace(n);
 }
 
-static struct mount *next_mnt(struct mount *p, struct vfsmount *root)
+static struct mount *next_mnt(struct mount *p, struct mount *root)
 {
        struct list_head *next = p->mnt_mounts.next;
        if (next == &p->mnt_mounts) {
                while (1) {
-                       if (&p->mnt == root)
+                       if (p == root)
                                return NULL;
                        next = p->mnt_child.next;
                        if (next != &p->mnt_parent->mnt_mounts)
@@ -1145,16 +1145,17 @@ const struct seq_operations mountstats_op = {
  * open files, pwds, chroots or sub mounts that are
  * busy.
  */
-int may_umount_tree(struct vfsmount *mnt)
+int may_umount_tree(struct vfsmount *m)
 {
+       struct mount *mnt = real_mount(m);
        int actual_refs = 0;
        int minimum_refs = 0;
        struct mount *p;
-       BUG_ON(!mnt);
+       BUG_ON(!m);
 
        /* write lock needed for mnt_get_count */
        br_write_lock(vfsmount_lock);
-       for (p = real_mount(mnt); p; p = next_mnt(p, mnt)) {
+       for (p = mnt; p; p = next_mnt(p, mnt)) {
                actual_refs += mnt_get_count(p);
                minimum_refs += 2;
        }
@@ -1228,7 +1229,7 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
        LIST_HEAD(tmp_list);
        struct mount *p;
 
-       for (p = mnt; p; p = next_mnt(p, &mnt->mnt))
+       for (p = mnt; p; p = next_mnt(p, mnt))
                list_move(&p->mnt_hash, &tmp_list);
 
        if (propagate)
@@ -1436,7 +1437,7 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
                if (!is_subdir(r->mnt_mountpoint, dentry))
                        continue;
 
-               for (s = r; s; s = next_mnt(s, &r->mnt)) {
+               for (s = r; s; s = next_mnt(s, r)) {
                        if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(s)) {
                                s = skip_mnt_tree(s);
                                continue;
@@ -1509,7 +1510,7 @@ static void cleanup_group_ids(struct mount *mnt, struct mount *end)
 {
        struct mount *p;
 
-       for (p = mnt; p != end; p = next_mnt(p, &mnt->mnt)) {
+       for (p = mnt; p != end; p = next_mnt(p, mnt)) {
                if (p->mnt_group_id && !IS_MNT_SHARED(p))
                        mnt_release_group_id(p);
        }
@@ -1519,7 +1520,7 @@ static int invent_group_ids(struct mount *mnt, bool recurse)
 {
        struct mount *p;
 
-       for (p = mnt; p; p = recurse ? next_mnt(p, &mnt->mnt) : NULL) {
+       for (p = mnt; p; p = recurse ? next_mnt(p, mnt) : NULL) {
                if (!p->mnt_group_id && !IS_MNT_SHARED(p)) {
                        int err = mnt_alloc_group_id(p);
                        if (err) {
@@ -1616,7 +1617,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
        br_write_lock(vfsmount_lock);
 
        if (IS_MNT_SHARED(dest_mnt)) {
-               for (p = source_mnt; p; p = next_mnt(p, &source_mnt->mnt))
+               for (p = source_mnt; p; p = next_mnt(p, source_mnt))
                        set_mnt_shared(p);
        }
        if (parent_path) {
@@ -1731,7 +1732,7 @@ static int do_change_type(struct path *path, int flag)
        }
 
        br_write_lock(vfsmount_lock);
-       for (m = mnt; m; m = (recurse ? next_mnt(m, &mnt->mnt) : NULL))
+       for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
                change_mnt_propagation(m, type);
        br_write_unlock(vfsmount_lock);
 
@@ -1859,7 +1860,7 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
 static inline int tree_contains_unbindable(struct mount *mnt)
 {
        struct mount *p;
-       for (p = mnt; p; p = next_mnt(p, &mnt->mnt)) {
+       for (p = mnt; p; p = next_mnt(p, mnt)) {
                if (IS_MNT_UNBINDABLE(p))
                        return 1;
        }
@@ -2399,6 +2400,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
        struct mnt_namespace *new_ns;
        struct vfsmount *rootmnt = NULL, *pwdmnt = NULL;
        struct mount *p, *q;
+       struct mount *old = real_mount(mnt_ns->root);
        struct mount *new;
 
        new_ns = alloc_mnt_ns();
@@ -2407,8 +2409,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
 
        down_write(&namespace_sem);
        /* First pass: copy the tree topology */
-       new = copy_tree(real_mount(mnt_ns->root), mnt_ns->root->mnt_root,
-                                       CL_COPY_ALL | CL_EXPIRE);
+       new = copy_tree(old, old->mnt.mnt_root, CL_COPY_ALL | CL_EXPIRE);
        if (!new) {
                up_write(&namespace_sem);
                kfree(new_ns);
@@ -2424,7 +2425,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
         * as belonging to new namespace.  We have already acquired a private
         * fs_struct, so tsk->fs->lock is not needed.
         */
-       p = real_mount(mnt_ns->root);
+       p = old;
        q = new;
        while (p) {
                q->mnt_ns = new_ns;
@@ -2443,8 +2444,8 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
                                pwdmnt = &p->mnt;
                        }
                }
-               p = next_mnt(p, mnt_ns->root);
-               q = next_mnt(q, new_ns->root);
+               p = next_mnt(p, old);
+               q = next_mnt(q, new);
        }
        up_write(&namespace_sem);