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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>
This commit is contained in:
Mikulas Patocka 2019-09-12 10:44:46 +02:00 committed by Mike Snitzer
parent d0a328a385
commit af53badc0c
1 changed files with 12 additions and 3 deletions
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15
drivers/md/dm-bufio.c
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@ -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);
}
/*