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Subject[RFC][PATCH 1/3] vfs: Keep a list of mounts on a mount point

Signed-off-by: Eric W. Biederman <ebiederman@twitter.com>
---
fs/mount.h | 2 ++
fs/namespace.c | 5 +++++
2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/fs/mount.h b/fs/mount.h
index 64a858143ff9..e4342b8dfab1 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -21,6 +21,7 @@ struct mnt_pcp {
struct mountpoint {
struct list_head m_hash;
struct dentry *m_dentry;
+ struct list_head m_list;
int m_count;
};

@@ -47,6 +48,7 @@ struct mount {
struct mount *mnt_master; /* slave is on master->mnt_slave_list */
struct mnt_namespace *mnt_ns; /* containing namespace */
struct mountpoint *mnt_mp; /* where is it mounted */
+ struct list_head mnt_mp_list; /* list mounts with the same mountpoint */
#ifdef CONFIG_FSNOTIFY
struct hlist_head mnt_fsnotify_marks;
__u32 mnt_fsnotify_mask;
diff --git a/fs/namespace.c b/fs/namespace.c
index da5c49483430..d092964fe7f9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -197,6 +197,7 @@ static struct mount *alloc_vfsmnt(const char *name)
INIT_LIST_HEAD(&mnt->mnt_share);
INIT_LIST_HEAD(&mnt->mnt_slave_list);
INIT_LIST_HEAD(&mnt->mnt_slave);
+ INIT_LIST_HEAD(&mnt->mnt_mp_list);
#ifdef CONFIG_FSNOTIFY
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
@@ -636,6 +637,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
mp->m_dentry = dentry;
mp->m_count = 1;
list_add(&mp->m_hash, chain);
+ INIT_LIST_HEAD(&mp->m_list);
return mp;
}

@@ -691,6 +693,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
list_del_init(&mnt->mnt_hash);
put_mountpoint(mnt->mnt_mp);
mnt->mnt_mp = NULL;
+ list_del_init(&mnt->mnt_mp_list);
}

/*
@@ -705,6 +708,7 @@ void mnt_set_mountpoint(struct mount *mnt,
child_mnt->mnt_mountpoint = dget(mp->m_dentry);
child_mnt->mnt_parent = mnt;
child_mnt->mnt_mp = mp;
+ list_add_tail(&child_mnt->mnt_mp_list, &mp->m_list);
}

/*
@@ -1193,6 +1197,7 @@ void umount_tree(struct mount *mnt, int propagate)
p->mnt_parent->mnt_ghosts++;
put_mountpoint(p->mnt_mp);
p->mnt_mp = NULL;
+ list_del_init(&mnt->mnt_mp_list);
}
change_mnt_propagation(p, MS_PRIVATE);
}
--
1.7.5.4


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