diff options
Diffstat (limited to 'block/blk-settings.c')
| -rw-r--r-- | block/blk-settings.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 529e55f52a03..1e7174ffc9d4 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -88,6 +88,7 @@ EXPORT_SYMBOL_GPL(blk_queue_lld_busy); void blk_set_default_limits(struct queue_limits *lim) { lim->max_segments = BLK_MAX_SEGMENTS; + lim->max_discard_segments = 1; lim->max_integrity_segments = 0; lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; lim->virt_boundary_mask = 0; @@ -128,6 +129,7 @@ void blk_set_stacking_limits(struct queue_limits *lim) /* Inherit limits from component devices */ lim->discard_zeroes_data = 1; lim->max_segments = USHRT_MAX; + lim->max_discard_segments = 1; lim->max_hw_sectors = UINT_MAX; lim->max_segment_size = UINT_MAX; lim->max_sectors = UINT_MAX; @@ -253,7 +255,7 @@ void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_secto max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS); limits->max_sectors = max_sectors; - q->backing_dev_info.io_pages = max_sectors >> (PAGE_SHIFT - 9); + q->backing_dev_info->io_pages = max_sectors >> (PAGE_SHIFT - 9); } EXPORT_SYMBOL(blk_queue_max_hw_sectors); @@ -337,6 +339,22 @@ void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments EXPORT_SYMBOL(blk_queue_max_segments); /** + * blk_queue_max_discard_segments - set max segments for discard requests + * @q: the request queue for the device + * @max_segments: max number of segments + * + * Description: + * Enables a low level driver to set an upper limit on the number of + * segments in a discard request. + **/ +void blk_queue_max_discard_segments(struct request_queue *q, + unsigned short max_segments) +{ + q->limits.max_discard_segments = max_segments; +} +EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); + +/** * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg * @q: the request queue for the device * @max_size: max size of segment in bytes @@ -553,6 +571,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, b->virt_boundary_mask); t->max_segments = min_not_zero(t->max_segments, b->max_segments); + t->max_discard_segments = min_not_zero(t->max_discard_segments, + b->max_discard_segments); t->max_integrity_segments = min_not_zero(t->max_integrity_segments, b->max_integrity_segments); |