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authorMikulas Patocka <mpatocka@redhat.com>2019-09-12 10:44:46 +0200
committerMike Snitzer <snitzer@redhat.com>2019-09-13 10:43:27 -0400
commitaf53badc0cd8a511b016a10c0cccf916692f1fc2 (patch)
tree219d84d62f10d6d36221e99b5c6a99b2e42a1e09 /drivers/md
parentd0a328a385d2d1ab87e7a959d91c1841ed5a498f (diff)
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: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-bufio.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 58df20fd5465..2451a4d68aed 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -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);
}
/*