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-rw-r--r--block/blk-settings.c32
-rw-r--r--drivers/md/dm-table.c6
-rw-r--r--drivers/md/md.c1
-rw-r--r--include/linux/blkdev.h1
4 files changed, 29 insertions, 11 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
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 8e9132130142..63cc54289aff 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -699,7 +699,7 @@ static int validate_hardware_logical_block_alignment(struct dm_table *table,
while (i < dm_table_get_num_targets(table)) {
ti = dm_table_get_target(table, i++);
- blk_set_default_limits(&ti_limits);
+ blk_set_stacking_limits(&ti_limits);
/* combine all target devices' limits */
if (ti->type->iterate_devices)
@@ -1221,10 +1221,10 @@ int dm_calculate_queue_limits(struct dm_table *table,
struct queue_limits ti_limits;
unsigned i = 0;
- blk_set_default_limits(limits);
+ blk_set_stacking_limits(limits);
while (i < dm_table_get_num_targets(table)) {
- blk_set_default_limits(&ti_limits);
+ blk_set_stacking_limits(&ti_limits);
ti = dm_table_get_target(table, i++);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ee981737edfc..114ba155af87 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4622,6 +4622,7 @@ static int md_alloc(dev_t dev, char *name)
mddev->queue->queuedata = mddev;
blk_queue_make_request(mddev->queue, md_make_request);
+ blk_set_stacking_limits(&mddev->queue->limits);
disk = alloc_disk(1 << shift);
if (!disk) {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8bca04873f53..adc34133a56a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -844,6 +844,7 @@ extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
extern void blk_set_default_limits(struct queue_limits *lim);
+extern void blk_set_stacking_limits(struct queue_limits *lim);
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
sector_t offset);
extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,