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Commit af53badc authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm bufio: introduce a global queue 



Rename param_spinlock to global_spinlock and introduce a global queue of
all used buffers.  The queue will be used in the following commits.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent d0a328a3

drivers/md/dm-bufio.c

+12 −3
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ enum data_mode { 
struct dm_buffer {

	struct rb_node node;

	struct list_head lru_list;

	struct list_head global_list;

	sector_t block;

	void *data;

	unsigned char data_mode;		/* DATA_MODE_* */
@@ -192,7 +193,9 @@ static unsigned long dm_bufio_cache_size; 
 */

static unsigned long dm_bufio_cache_size_latch;



static DEFINE_SPINLOCK(param_spinlock);

static DEFINE_SPINLOCK(global_spinlock);



static LIST_HEAD(global_queue);



/*

 * Buffers are freed after this timeout
@@ -301,7 +304,7 @@ static void adjust_total_allocated(struct dm_buffer *b, bool unlink) 
	if (unlink)

		diff = -diff;



	spin_lock(&param_spinlock);

	spin_lock(&global_spinlock);



	*class_ptr[data_mode] += diff;
@@ -310,7 +313,13 @@ static void adjust_total_allocated(struct dm_buffer *b, bool unlink) 
	if (dm_bufio_current_allocated > dm_bufio_peak_allocated)

		dm_bufio_peak_allocated = dm_bufio_current_allocated;



	spin_unlock(&param_spinlock);

	if (!unlink) {

		list_add(&b->global_list, &global_queue);

	} else {

		list_del(&b->global_list);

	}



	spin_unlock(&global_spinlock);

}



/*