linux-kernel - [PATCH 10/17] namespace.c: get rid of mnt

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Message-Id: <E1VRcFe-0008BF-AT@ZenIV.linux.org.uk>
Date:	Thu, 03 Oct 2013 07:19:06 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	torvalds@...ux-foundation.org
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/17] namespace.c: get rid of mnt_ghosts


Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/mount.h     |    2 +-
 fs/namespace.c |   22 +++++++---------------
 fs/pnode.c     |    3 +--
 3 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/fs/mount.h b/fs/mount.h
index 64a8581..3168dc4 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -55,7 +55,7 @@ struct mount {
 	int mnt_group_id;		/* peer group identifier */
 	int mnt_expiry_mark;		/* true if marked for expiry */
 	int mnt_pinned;
-	int mnt_ghosts;
+	struct path mnt_ex_mountpoint;
 };
 
 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
diff --git a/fs/namespace.c b/fs/namespace.c
index 632c551..6985d52 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1136,20 +1136,8 @@ static void namespace_unlock(void)
 	while (!list_empty(&head)) {
 		mnt = list_first_entry(&head, struct mount, mnt_hash);
 		list_del_init(&mnt->mnt_hash);
-		if (mnt_has_parent(mnt)) {
-			struct dentry *dentry;
-			struct mount *m;
-
-			br_write_lock(&vfsmount_lock);
-			dentry = mnt->mnt_mountpoint;
-			m = mnt->mnt_parent;
-			mnt->mnt_mountpoint = mnt->mnt.mnt_root;
-			mnt->mnt_parent = mnt;
-			m->mnt_ghosts--;
-			br_write_unlock(&vfsmount_lock);
-			dput(dentry);
-			mntput(&m->mnt);
-		}
+		if (mnt->mnt_ex_mountpoint.mnt)
+			path_put(&mnt->mnt_ex_mountpoint);
 		mntput(&mnt->mnt);
 	}
 }
@@ -1181,8 +1169,12 @@ void umount_tree(struct mount *mnt, int propagate)
 		p->mnt_ns = NULL;
 		list_del_init(&p->mnt_child);
 		if (mnt_has_parent(p)) {
-			p->mnt_parent->mnt_ghosts++;
 			put_mountpoint(p->mnt_mp);
+			/* move the reference to mountpoint into ->mnt_ex_mountpoint */
+			p->mnt_ex_mountpoint.dentry = p->mnt_mountpoint;
+			p->mnt_ex_mountpoint.mnt = &p->mnt_parent->mnt;
+			p->mnt_mountpoint = p->mnt.mnt_root;
+			p->mnt_parent = p;
 			p->mnt_mp = NULL;
 		}
 		change_mnt_propagation(p, MS_PRIVATE);
diff --git a/fs/pnode.c b/fs/pnode.c
index 9af0df1..3cfd48c 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -278,8 +278,7 @@ out:
  */
 static inline int do_refcount_check(struct mount *mnt, int count)
 {
-	int mycount = mnt_get_count(mnt) - mnt->mnt_ghosts;
-	return (mycount > count);
+	return mnt_get_count(mnt) > count;
 }
 
 /*
-- 
1.7.2.5


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