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authorAl Viro <viro@zeniv.linux.org.uk>2011-11-23 19:26:23 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-03 22:52:36 -0500
commitb2dba1af3c4157040303a76d25216b1713d333d0 (patch)
treec846b1c8074d29b9fc02ef3eeda98631dfd6ee94 /fs/pnode.c
parentaa9c0e07bb90589186f3b5a0ca97660c2cb50806 (diff)
downloadlinux-b2dba1af3c4157040303a76d25216b1713d333d0.tar.bz2
vfs: new internal helper: mnt_has_parent(mnt)
vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/pnode.c')
-rw-r--r--fs/pnode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/pnode.c b/fs/pnode.c
index d42514e32380..f1cd958b92e5 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -36,7 +36,7 @@ static inline struct vfsmount *next_slave(struct vfsmount *p)
static bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
const struct path *root)
{
- while (mnt != root->mnt && mnt->mnt_parent != mnt) {
+ while (mnt != root->mnt && mnt_has_parent(mnt)) {
dentry = mnt->mnt_mountpoint;
mnt = mnt->mnt_parent;
}