26  * @holder_data: holder of a dax_device: could be filesystem or mapped device
27  * @holder_ops: operations for the inner holder
79  * @holder: filesystem or mapped device inside the dax_device
80  * @ops: operations for the inner holder
83 		void *holder, const struct dax_holder_operations *ops)  in fs_dax_get_by_bdev()  argument
103 	else if (holder) {  in fs_dax_get_by_bdev()
104 		if (!cmpxchg(&dax_dev->holder_data, NULL, holder))  in fs_dax_get_by_bdev()
120  * fs_put_dax() - release holder ownership of a dax_device
122  * @holder: the holder pointer previously passed to fs_dax_get() or
126  * Must only be called by the current holder. Clears holder_ops before
130 void fs_put_dax(struct dax_device *dax_dev, void *holder)  in fs_put_dax()  argument
132 	if (dax_dev && holder) {  in fs_put_dax()
144 		prev = cmpxchg(&dax_dev->holder_data, holder, NULL);  in fs_put_dax()
147 		 * prev == holder: normal release.  in fs_put_dax()
149 		 *                 device was removed under a live holder;  in fs_put_dax()
151 		 * prev != holder (non-NULL): fs_put_dax() called by something  in fs_put_dax()
152 		 *                 that is not the current holder; an API  in fs_put_dax()
158 		WARN_ON(prev && prev != holder);  in fs_put_dax()
165  * fs_dax_get() - get ownership of a devdax via holder/holder_ops
169  * dev_dax (and there is no bdev). The holder makes this exclusive.
172  * @holder: filesystem or mapped device inside the dax_device
173  * @hops: operations for the inner holder
177 int fs_dax_get(struct dax_device *dax_dev, void *holder,  in fs_dax_get()  argument
212 	if (cmpxchg(&dax_dev->holder_data, NULL, holder)) {  in fs_dax_get()
484 	/* clear holder data */  in kill_dax()
638  * dax_holder() - obtain the holder of a dax device
641  * Return: the holder's data which represents the holder if registered,