/*
* follow a link from a mountpoint directory, thus causing it to be mounted
*/
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct vfsmount *newmnt;
int err;
_enter("%p{%s},{%s:%p{%s},}",
dentry,
dentry->d_name.name,
nd->mnt->mnt_devname,
dentry,
nd->dentry->d_name.name);
dput(nd->dentry);
nd->dentry = dget(dentry);
newmnt = afs_mntpt_do_automount(nd->dentry);
if (IS_ERR(newmnt)) {
path_release(nd);
return (void *)newmnt;
}
mntget(newmnt);
err = do_add_mount(newmnt, nd, MNT_SHRINKABLE, &afs_vfsmounts);
switch (err) {
case 0:
mntput(nd->mnt);
dput(nd->dentry);
nd->mnt = newmnt;
nd->dentry = dget(newmnt->mnt_root);
schedule_delayed_work(&afs_mntpt_expiry_timer,
afs_mntpt_expiry_timeout * HZ);
break;
case -EBUSY:
/* someone else made a mount here whilst we were busy */
while (d_mountpoint(nd->dentry) &&
follow_down(&nd->mnt, &nd->dentry))
;
err = 0;
default:
mntput(newmnt);
break;
}
_leave(" = %d", err);
return ERR_PTR(err);
}
/*
* handle an automount point
*/
struct vfsmount *afs_d_automount(struct path *path)
{
struct vfsmount *newmnt;
_enter("{%pd}", path->dentry);
newmnt = afs_mntpt_do_automount(path->dentry);
if (IS_ERR(newmnt))
return newmnt;
mntget(newmnt); /* prevent immediate expiration */
mnt_set_expiry(newmnt, &afs_vfsmounts);
queue_delayed_work(afs_wq, &afs_mntpt_expiry_timer,
afs_mntpt_expiry_timeout * HZ);
_leave(" = %p", newmnt);
return newmnt;
}
/*
* follow a link from a mountpoint directory, thus causing it to be mounted
*/
static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct vfsmount *newmnt;
struct dentry *old_dentry;
int err;
kenter("%p{%s},{%s:%p{%s}}",
dentry,
dentry->d_name.name,
nd->mnt->mnt_devname,
dentry,
nd->dentry->d_name.name);
newmnt = afs_mntpt_do_automount(dentry);
if (IS_ERR(newmnt)) {
path_release(nd);
return (void *)newmnt;
}
old_dentry = nd->dentry;
nd->dentry = dentry;
err = do_add_mount(newmnt, nd, 0, &afs_vfsmounts);
nd->dentry = old_dentry;
path_release(nd);
if (!err) {
mntget(newmnt);
nd->mnt = newmnt;
dget(newmnt->mnt_root);
nd->dentry = newmnt->mnt_root;
}
kleave(" = %d", err);
return ERR_PTR(err);
} /* end afs_mntpt_follow_link() */
