static int au_ren_lock(struct au_ren_args *a)
{
int err;
unsigned int udba;
err = 0;
a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
a->src_hdir = au_hi(a->src_dir, a->btgt);
a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
a->dst_hdir = au_hi(a->dst_dir, a->btgt);
a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
a->dst_h_parent, a->dst_hdir);
udba = au_opt_udba(a->src_dentry->d_sb);
if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode
|| a->dst_hdir->hi_inode != a->dst_h_parent->d_inode))
err = au_busy_or_stale();
if (!err && au_dbstart(a->src_dentry) == a->btgt)
err = au_h_verify(a->src_h_dentry, udba,
a->src_h_parent->d_inode, a->src_h_parent,
a->br);
if (!err && au_dbstart(a->dst_dentry) == a->btgt)
err = au_h_verify(a->dst_h_dentry, udba,
a->dst_h_parent->d_inode, a->dst_h_parent,
a->br);
if (!err) {
err = mnt_want_write(a->br->br_mnt);
if (unlikely(err))
goto out_unlock;
au_fset_ren(a->flags, MNT_WRITE);
goto out; /* success */
}
err = au_busy_or_stale();
out_unlock:
au_ren_unlock(a);
out:
return err;
}
int au_do_pin(struct au_pin *p)
{
int err;
struct super_block *sb;
struct dentry *h_dentry, *h_parent;
struct au_branch *br;
struct inode *h_dir;
err = 0;
sb = p->dentry->d_sb;
br = au_sbr(sb, p->bindex);
if (IS_ROOT(p->dentry)) {
if (au_ftest_pin(p->flags, MNT_WRITE)) {
p->h_mnt = br->br_mnt;
err = mnt_want_write(p->h_mnt);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_err;
}
}
goto out;
}
h_dentry = NULL;
if (p->bindex <= au_dbend(p->dentry))
h_dentry = au_h_dptr(p->dentry, p->bindex);
p->parent = dget_parent(p->dentry);
if (!au_ftest_pin(p->flags, DI_LOCKED))
di_read_lock(p->parent, AuLock_IR, p->lsc_di);
h_dir = NULL;
h_parent = au_h_dptr(p->parent, p->bindex);
p->hdir = au_hi(p->parent->d_inode, p->bindex);
if (p->hdir)
h_dir = p->hdir->hi_inode;
/*
* udba case, or
* if DI_LOCKED is not set, then p->parent may be different
* and h_parent can be NULL.
*/
if (unlikely(!p->hdir || !h_dir || !h_parent)) {
err = -EBUSY;
if (!au_ftest_pin(p->flags, DI_LOCKED))
di_read_unlock(p->parent, AuLock_IR);
dput(p->parent);
p->parent = NULL;
goto out_err;
}
au_igrab(h_dir);
au_hn_imtx_lock_nested(p->hdir, p->lsc_hi);
if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) {
err = -EBUSY;
goto out_unpin;
}
if (h_dentry) {
err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_unpin;
}
}
if (au_ftest_pin(p->flags, MNT_WRITE)) {
p->h_mnt = br->br_mnt;
err = mnt_want_write(p->h_mnt);
if (unlikely(err)) {
au_fclr_pin(p->flags, MNT_WRITE);
goto out_unpin;
}
}
goto out; /* success */
out_unpin:
au_unpin(p);
out_err:
pr_err("err %d\n", err);
err = au_busy_or_stale();
out:
return err;
}