struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags)
{
int err;
struct path realpath;
enum ovl_path_type type;
if (d_is_dir(dentry))
return d_backing_inode(dentry);
type = ovl_path_real(dentry, &realpath);
if (ovl_open_need_copy_up(file_flags, type, realpath.dentry)) {
err = ovl_want_write(dentry);
if (err)
return ERR_PTR(err);
if (file_flags & O_TRUNC)
err = ovl_copy_up_truncate(dentry);
else
err = ovl_copy_up(dentry);
ovl_drop_write(dentry);
if (err)
return ERR_PTR(err);
ovl_path_upper(dentry, &realpath);
}
if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);
return d_backing_inode(realpath.dentry);
}
static struct file *ovl_open(struct dentry *dentry, struct file *file,
const struct cred *cred)
{
int err;
struct path realpath;
enum ovl_path_type type;
type = ovl_path_real(dentry, &realpath);
if (ovl_open_need_copy_up(file->f_flags, type, realpath.dentry)) {
if (file->f_flags & O_TRUNC)
err = ovl_copy_up_truncate(dentry, 0);
else
err = ovl_copy_up(dentry);
if (err)
return ERR_PTR(err);
ovl_path_upper(dentry, &realpath);
}
return vfs_open(&realpath, file, cred);
}
int ovl_setattr(struct dentry *dentry, struct iattr *attr)
{
struct dentry *upperdentry;
int err;
if ((attr->ia_valid & ATTR_SIZE) && !ovl_dentry_upper(dentry))
err = ovl_copy_up_truncate(dentry, attr->ia_size);
else
err = ovl_copy_up(dentry);
if (err)
return err;
upperdentry = ovl_dentry_upper(dentry);
if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
attr->ia_valid &= ~ATTR_MODE;
mutex_lock(&upperdentry->d_inode->i_mutex);
err = notify_change(upperdentry, attr);
mutex_unlock(&upperdentry->d_inode->i_mutex);
return err;
}
