diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2011-06-01 10:57:14 +0200 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2011-10-17 09:52:08 -0600 |
| commit | a25648af002512347105865687a313f74aa8bd8e (patch) | |
| tree | 45a2454e7971564aa30fc93356f6e036af6094db | |
| parent | 96b8cdca1de8c1b57a7a4ced17a89be5b70fdbd8 (diff) | |
UBUNTU: ubuntu: overlayfs -- vfs: introduce clone_private_mount()
Overlayfs needs a private clone of the mount, so create a function for
this and export to modules.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
| -rw-r--r-- | fs/namespace.c | 17 | ||||
| -rw-r--r-- | include/linux/mount.h | 3 |
2 files changed, 20 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 7d3843fdaee..09138dcd95c 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1494,6 +1494,23 @@ void drop_collected_mounts(struct vfsmount *mnt) release_mounts(&umount_list); } +struct vfsmount *clone_private_mount(struct path *path) +{ + struct vfsmount *mnt; + + if (IS_MNT_UNBINDABLE(path->mnt)) + return ERR_PTR(-EINVAL); + + down_read(&namespace_sem); + mnt = clone_mnt(path->mnt, path->dentry, CL_PRIVATE); + up_read(&namespace_sem); + if (!mnt) + return ERR_PTR(-ENOMEM); + + return mnt; +} +EXPORT_SYMBOL_GPL(clone_private_mount); + int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, struct vfsmount *root) { diff --git a/include/linux/mount.h b/include/linux/mount.h index 604f122a232..44e9bf4d95c 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -100,6 +100,9 @@ extern void mnt_pin(struct vfsmount *mnt); extern void mnt_unpin(struct vfsmount *mnt); extern int __mnt_is_readonly(struct vfsmount *mnt); +struct path; +extern struct vfsmount *clone_private_mount(struct path *path); + extern struct vfsmount *do_kern_mount(const char *fstype, int flags, const char *name, void *data); |