vfs: spread struct mount - shared subtree iterators

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

1 files changed, 47 insertions, 50 deletions

diff --git a/fs/pnode.c b/fs/pnode.c
index 29e366dec024..f86cd4bc31ce 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -13,19 +13,19 @@
 #include "pnode.h"
 
 /* return the next shared peer mount of @p */
-static inline struct vfsmount *next_peer(struct vfsmount *p)
+static inline struct mount *next_peer(struct mount *p)
 {
-        return list_entry(p->mnt_share.next, struct vfsmount, mnt_share);
+        return list_entry(p->mnt.mnt_share.next, struct mount, mnt.mnt_share);
 }
 
-static inline struct vfsmount *first_slave(struct vfsmount *p)
+static inline struct mount *first_slave(struct mount *p)
 {
-        return list_entry(p->mnt_slave_list.next, struct vfsmount, mnt_slave);
+        return list_entry(p->mnt.mnt_slave_list.next, struct mount, mnt.mnt_slave);
 }
 
-static inline struct vfsmount *next_slave(struct vfsmount *p)
+static inline struct mount *next_slave(struct mount *p)
 {
-        return list_entry(p->mnt_slave.next, struct vfsmount, mnt_slave);
+        return list_entry(p->mnt.mnt_slave.next, struct mount, mnt.mnt_slave);
 }
 
 static struct mount *get_peer_under_root(struct mount *mnt,
@@ -39,7 +39,7 @@ static struct mount *get_peer_under_root(struct mount *mnt,
                 if (m->mnt.mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))
                         return m;
 
-                m = real_mount(next_peer(&m->mnt));
+                m = next_peer(m);
         } while (m != mnt);
 
         return NULL;
@@ -74,11 +74,11 @@ static int do_make_slave(struct mount *mnt)
          * same root dentry. If none is available then
          * slave it to anything that is available.
          */
-        while ((peer_mnt = real_mount(next_peer(&peer_mnt->mnt))) != mnt &&
+        while ((peer_mnt = next_peer(peer_mnt)) != mnt &&
                peer_mnt->mnt.mnt_root != mnt->mnt.mnt_root) ;
 
         if (peer_mnt == mnt) {
-                peer_mnt = real_mount(next_peer(&mnt->mnt));
+                peer_mnt = next_peer(mnt);
                 if (peer_mnt == mnt)
                         peer_mnt = NULL;
         }
@@ -141,21 +141,20 @@ void change_mnt_propagation(struct mount *mnt, int type)
  * vfsmount found while iterating with propagation_next() is
  * a peer of one we'd found earlier.
  */
-static struct vfsmount *propagation_next(struct vfsmount *m,
-                                         struct vfsmount *origin)
+static struct mount *propagation_next(struct mount *m,
+                                         struct mount *origin)
 {
         /* are there any slaves of this mount? */
-        if (!IS_MNT_NEW(m) && !list_empty(&m->mnt_slave_list))
+        if (!IS_MNT_NEW(&m->mnt) && !list_empty(&m->mnt.mnt_slave_list))
                 return first_slave(m);
 
         while (1) {
-                struct vfsmount *next;
-                struct vfsmount *master = m->mnt_master;
+                struct mount *master = real_mount(m->mnt.mnt_master);
 
-                if (master == origin->mnt_master) {
-                        next = next_peer(m);
-                        return ((next == origin) ? NULL : next);
-                } else if (m->mnt_slave.next != &master->mnt_slave_list)
+                if (&master->mnt == origin->mnt.mnt_master) {
+                        struct mount *next = next_peer(m);
+                        return (next == origin) ? NULL : next;
+                } else if (m->mnt.mnt_slave.next != &master->mnt.mnt_slave_list)
                         return next_slave(m);
 
                 /* back at master */
@@ -172,25 +171,25 @@ static struct vfsmount *propagation_next(struct vfsmount *m,
  * @type        return CL_SLAVE if the new mount has to be
  *              cloned as a slave.
  */
-static struct vfsmount *get_source(struct vfsmount *dest,
-                                        struct vfsmount *last_dest,
-                                        struct vfsmount *last_src,
-                                        int *type)
+static struct mount *get_source(struct mount *dest,
+                                struct mount *last_dest,
+                                struct mount *last_src,
+                                int *type)
 {
-        struct vfsmount *p_last_src = NULL;
-        struct vfsmount *p_last_dest = NULL;
+        struct mount *p_last_src = NULL;
+        struct mount *p_last_dest = NULL;
 
-        while (last_dest != dest->mnt_master) {
+        while (&last_dest->mnt != dest->mnt.mnt_master) {
                 p_last_dest = last_dest;
                 p_last_src = last_src;
-                last_dest = last_dest->mnt_master;
-                last_src = last_src->mnt_master;
+                last_dest = real_mount(last_dest->mnt.mnt_master);
+                last_src = real_mount(last_src->mnt.mnt_master);
         }
 
         if (p_last_dest) {
                 do {
                         p_last_dest = next_peer(p_last_dest);
-                } while (IS_MNT_NEW(p_last_dest));
+                } while (IS_MNT_NEW(&p_last_dest->mnt));
                 /* is that a peer of the earlier? */
                 if (dest == p_last_dest) {
                         *type = CL_MAKE_SHARED;
@@ -200,7 +199,7 @@ static struct vfsmount *get_source(struct vfsmount *dest,
         /* slave of the earlier, then */
         *type = CL_SLAVE;
         /* beginning of peer group among the slaves? */
-        if (IS_MNT_SHARED(dest))
+        if (IS_MNT_SHARED(&dest->mnt))
                 *type |= CL_MAKE_SHARED;
         return last_src;
 }
@@ -221,32 +220,31 @@ static struct vfsmount *get_source(struct vfsmount *dest,
 int propagate_mnt(struct vfsmount *dest_mnt, struct dentry *dest_dentry,
                     struct vfsmount *source_mnt, struct list_head *tree_list)
 {
-        struct vfsmount *m;
-        struct mount *child;
+        struct mount *m, *child;
         int ret = 0;
-        struct vfsmount *prev_dest_mnt = dest_mnt;
-        struct vfsmount *prev_src_mnt  = source_mnt;
+        struct mount *prev_dest_mnt = real_mount(dest_mnt);
+        struct mount *prev_src_mnt  = real_mount(source_mnt);
         LIST_HEAD(tmp_list);
         LIST_HEAD(umount_list);
 
-        for (m = propagation_next(dest_mnt, dest_mnt); m;
-                        m = propagation_next(m, dest_mnt)) {
+        for (m = propagation_next(real_mount(dest_mnt), real_mount(dest_mnt)); m;
+                        m = propagation_next(m, real_mount(dest_mnt))) {
                 int type;
-                struct vfsmount *source;
+                struct mount *source;
 
-                if (IS_MNT_NEW(m))
+                if (IS_MNT_NEW(&m->mnt))
                         continue;
 
                 source =  get_source(m, prev_dest_mnt, prev_src_mnt, &type);
 
-                if (!(child = copy_tree(real_mount(source), source->mnt_root, type))) {
+                if (!(child = copy_tree(source, source->mnt.mnt_root, type))) {
                         ret = -ENOMEM;
                         list_splice(tree_list, tmp_list.prev);
                         goto out;
                 }
 
-                if (is_subdir(dest_dentry, m->mnt_root)) {
-                        mnt_set_mountpoint(m, dest_dentry, child);
+                if (is_subdir(dest_dentry, m->mnt.mnt_root)) {
+                        mnt_set_mountpoint(&m->mnt, dest_dentry, child);
                         list_add_tail(&child->mnt_hash, tree_list);
                 } else {
                         /*
@@ -256,7 +254,7 @@ int propagate_mnt(struct vfsmount *dest_mnt, struct dentry *dest_dentry,
                         list_add_tail(&child->mnt_hash, &tmp_list);
                 }
                 prev_dest_mnt = m;
-                prev_src_mnt  = &child->mnt;
+                prev_src_mnt  = child;
         }
 out:
         br_write_lock(vfsmount_lock);
@@ -290,8 +288,7 @@ static inline int do_refcount_check(struct mount *mnt, int count)
  */
 int propagate_mount_busy(struct mount *mnt, int refcnt)
 {
-        struct vfsmount *m;
-        struct mount *child;
+        struct mount *m, *child;
         struct mount *parent = mnt->mnt_parent;
         int ret = 0;
 
@@ -306,9 +303,9 @@ int propagate_mount_busy(struct mount *mnt, int refcnt)
         if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))
                 return 1;
 
-        for (m = propagation_next(&parent->mnt, &parent->mnt); m;
-                        m = propagation_next(m, &parent->mnt)) {
-                child = __lookup_mnt(m, mnt->mnt_mountpoint, 0);
+        for (m = propagation_next(parent, parent); m;
+                        m = propagation_next(m, parent)) {
+                child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint, 0);
                 if (child && list_empty(&child->mnt_mounts) &&
                     (ret = do_refcount_check(child, 1)))
                         break;
@@ -323,14 +320,14 @@ int propagate_mount_busy(struct mount *mnt, int refcnt)
 static void __propagate_umount(struct mount *mnt)
 {
         struct mount *parent = mnt->mnt_parent;
-        struct vfsmount *m;
+        struct mount *m;
 
         BUG_ON(parent == mnt);
 
-        for (m = propagation_next(&parent->mnt, &parent->mnt); m;
-                        m = propagation_next(m, &parent->mnt)) {
+        for (m = propagation_next(parent, parent); m;
+                        m = propagation_next(m, parent)) {
 
-                struct mount *child = __lookup_mnt(m,
+                struct mount *child = __lookup_mnt(&m->mnt,
                                         mnt->mnt_mountpoint, 0);
                 /*
                  * umount the child only if the child has no