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vfs: new internal helper: mnt_has_parent(mnt)

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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>
This commit is contained in:
Al Viro 2011-11-23 19:26:23 -05:00
parent aa9c0e07bb
commit b2dba1af3c
5 changed files with 18 additions and 12 deletions
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2
fs/pnode.c
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@ -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;
}