block: add support for REQ_OP_WRITE_ZEROES

[mirror_ubuntu-eoan-kernel.git] / block / blk-settings.c

diff --git a/block/blk-settings.c b/block/blk-settings.c
index c7ccabc0ec3ea6eebc40f2a9585f9148d277889f..8a2bc124a6840f2542355bdd01b543404a333796 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -96,6 +96,7 @@ void blk_set_default_limits(struct queue_limits *lim)
        lim->max_dev_sectors = 0;
        lim->chunk_sectors = 0;
        lim->max_write_same_sectors = 0;
+       lim->max_write_zeroes_sectors = 0;
        lim->max_discard_sectors = 0;
        lim->max_hw_discard_sectors = 0;
        lim->discard_granularity = 0;
@@ -132,6 +133,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
        lim->max_sectors = UINT_MAX;
        lim->max_dev_sectors = UINT_MAX;
        lim->max_write_same_sectors = UINT_MAX;
+       lim->max_write_zeroes_sectors = UINT_MAX;
 }
 EXPORT_SYMBOL(blk_set_stacking_limits);
 
@@ -299,6 +301,19 @@ void blk_queue_max_write_same_sectors(struct request_queue *q,
 }
 EXPORT_SYMBOL(blk_queue_max_write_same_sectors);
 
+/**
+ * blk_queue_max_write_zeroes_sectors - set max sectors for a single
+ *                                      write zeroes
+ * @q:  the request queue for the device
+ * @max_write_zeroes_sectors: maximum number of sectors to write per command
+ **/
+void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
+               unsigned int max_write_zeroes_sectors)
+{
+       q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors;
+}
+EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors);
+
 /**
  * blk_queue_max_segments - set max hw segments for a request for this queue
  * @q:  the request queue for the device
@@ -527,6 +542,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
        t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors);
        t->max_write_same_sectors = min(t->max_write_same_sectors,
                                        b->max_write_same_sectors);
+       t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors,
+                                       b->max_write_zeroes_sectors);
        t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn);
 
        t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask,