diff options
Diffstat (limited to 'block/blk-settings.c')
| -rw-r--r-- | block/blk-settings.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index fa1eb0449a05..d3234fc494ad 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -104,9 +104,7 @@ EXPORT_SYMBOL_GPL(blk_queue_lld_busy); * @lim: the queue_limits structure to reset * * Description: - * Returns a queue_limit struct to its default state. Can be used by - * stacking drivers like DM that stage table swaps and reuse an - * existing device queue. + * Returns a queue_limit struct to its default state. */ void blk_set_default_limits(struct queue_limits *lim) { @@ -114,13 +112,12 @@ void blk_set_default_limits(struct queue_limits *lim) lim->max_integrity_segments = 0; lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; - lim->max_sectors = BLK_DEF_MAX_SECTORS; - lim->max_hw_sectors = INT_MAX; + lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; lim->max_discard_sectors = 0; lim->discard_granularity = 0; lim->discard_alignment = 0; lim->discard_misaligned = 0; - lim->discard_zeroes_data = 1; + lim->discard_zeroes_data = 0; lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); lim->alignment_offset = 0; @@ -131,6 +128,27 @@ void blk_set_default_limits(struct queue_limits *lim) EXPORT_SYMBOL(blk_set_default_limits); /** + * blk_set_stacking_limits - set default limits for stacking devices + * @lim: the queue_limits structure to reset + * + * Description: + * Returns a queue_limit struct to its default state. Should be used + * by stacking drivers like DM that have no internal limits. + */ +void blk_set_stacking_limits(struct queue_limits *lim) +{ + blk_set_default_limits(lim); + + /* Inherit limits from component devices */ + lim->discard_zeroes_data = 1; + lim->max_segments = USHRT_MAX; + lim->max_hw_sectors = UINT_MAX; + + lim->max_sectors = BLK_DEF_MAX_SECTORS; +} +EXPORT_SYMBOL(blk_set_stacking_limits); + +/** * blk_queue_make_request - define an alternate make_request function for a device * @q: the request queue for the device to be affected * @mfn: the alternate make_request function @@ -165,8 +183,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) q->nr_batching = BLK_BATCH_REQ; blk_set_default_limits(&q->limits); - blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS); - q->limits.discard_zeroes_data = 0; /* * by default assume old behaviour and bounce for any highmem page |