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vfs: spread struct mount - is_path_reachable

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 22:00:28 -05:00
parent 676da58df7
commit 643822b41e
3 changed files with 13 additions and 13 deletions
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14
fs/namespace.c
View File

@ -2559,21 +2559,21 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
*
* namespace_sem or vfsmount_lock is held
*/
bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
const struct path *root)
{
while (mnt != root->mnt && mnt_has_parent(real_mount(mnt))) {
dentry = mnt->mnt_mountpoint;
mnt = mnt->mnt_parent;
while (&mnt->mnt != root->mnt && mnt_has_parent(mnt)) {
dentry = mnt->mnt.mnt_mountpoint;
mnt = real_mount(mnt->mnt.mnt_parent);
}
return mnt == root->mnt && is_subdir(dentry, root->dentry);
return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);
}
int path_is_under(struct path *path1, struct path *path2)
{
int res;
br_read_lock(vfsmount_lock);
res = is_path_reachable(path1->mnt, path1->dentry, path2);
res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
br_read_unlock(vfsmount_lock);
return res;
}
@ -2659,7 +2659,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
if (!mnt_has_parent(new_mnt))
goto out4; /* not attached */
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(old.mnt, old.dentry, &new))
if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
goto out4;
br_write_lock(vfsmount_lock);
detach_mnt(new_mnt, &parent_path);

10
fs/pnode.c
View File

@ -32,15 +32,15 @@ static struct vfsmount *get_peer_under_root(struct vfsmount *mnt,
struct mnt_namespace *ns,
const struct path *root)
{
struct vfsmount *m = mnt;
struct mount *m = real_mount(mnt);
do {
/* Check the namespace first for optimization */
if (m->mnt_ns == ns && is_path_reachable(m, m->mnt_root, root))
return m;
if (m->mnt.mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))
return &m->mnt;
m = next_peer(m);
} while (m != mnt);
m = real_mount(next_peer(&m->mnt));
} while (&m->mnt != mnt);
return NULL;
}

2
fs/pnode.h
View File

@ -42,6 +42,6 @@ void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
void release_mounts(struct list_head *);
void umount_tree(struct mount *, int, struct list_head *);
struct mount *copy_tree(struct mount *, struct dentry *, int);
bool is_path_reachable(struct vfsmount *, struct dentry *,
bool is_path_reachable(struct mount *, struct dentry *,
const struct path *root);
#endif /* _LINUX_PNODE_H */