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Diffstat (limited to 'block/blk-settings.c')
-rw-r--r--block/blk-settings.c51
1 files changed, 40 insertions, 11 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 66d4aa8799b..dd1f1e0e196 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -8,6 +8,7 @@
#include <linux/blkdev.h>
#include <linux/bootmem.h> /* for max_pfn/max_low_pfn */
#include <linux/gcd.h>
+#include <linux/jiffies.h>
#include "blk.h"
@@ -96,7 +97,11 @@ void blk_set_default_limits(struct queue_limits *lim)
lim->max_segment_size = MAX_SEGMENT_SIZE;
lim->max_sectors = BLK_DEF_MAX_SECTORS;
lim->max_hw_sectors = INT_MAX;
- lim->max_discard_sectors = 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->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;
@@ -141,7 +146,7 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
q->nr_batching = BLK_BATCH_REQ;
q->unplug_thresh = 4; /* hmm */
- q->unplug_delay = (3 * HZ) / 1000; /* 3 milliseconds */
+ q->unplug_delay = msecs_to_jiffies(3); /* 3 milliseconds */
if (q->unplug_delay == 0)
q->unplug_delay = 1;
@@ -488,6 +493,16 @@ void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
}
EXPORT_SYMBOL(blk_queue_stack_limits);
+static unsigned int lcm(unsigned int a, unsigned int b)
+{
+ if (a && b)
+ return (a * b) / gcd(a, b);
+ else if (b)
+ return b;
+
+ return a;
+}
+
/**
* blk_stack_limits - adjust queue_limits for stacked devices
* @t: the stacking driver limits (top)
@@ -502,6 +517,10 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
sector_t offset)
{
+ int ret;
+
+ ret = 0;
+
t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);
t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn);
@@ -526,12 +545,19 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->io_min = max(t->io_min, b->io_min);
t->no_cluster |= b->no_cluster;
+ t->discard_zeroes_data &= b->discard_zeroes_data;
/* Bottom device offset aligned? */
if (offset &&
(offset & (b->physical_block_size - 1)) != b->alignment_offset) {
t->misaligned = 1;
- return -1;
+ ret = -1;
+ }
+
+ if (offset &&
+ (offset & (b->discard_granularity - 1)) != b->discard_alignment) {
+ t->discard_misaligned = 1;
+ ret = -1;
}
/* If top has no alignment offset, inherit from bottom */
@@ -539,23 +565,26 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->alignment_offset =
b->alignment_offset & (b->physical_block_size - 1);
+ if (!t->discard_alignment)
+ t->discard_alignment =
+ b->discard_alignment & (b->discard_granularity - 1);
+
/* Top device aligned on logical block boundary? */
if (t->alignment_offset & (t->logical_block_size - 1)) {
t->misaligned = 1;
- return -1;
+ ret = -1;
}
- /* Find lcm() of optimal I/O size */
- if (t->io_opt && b->io_opt)
- t->io_opt = (t->io_opt * b->io_opt) / gcd(t->io_opt, b->io_opt);
- else if (b->io_opt)
- t->io_opt = b->io_opt;
+ /* Find lcm() of optimal I/O size and granularity */
+ t->io_opt = lcm(t->io_opt, b->io_opt);
+ t->discard_granularity = lcm(t->discard_granularity,
+ b->discard_granularity);
/* Verify that optimal I/O size is a multiple of io_min */
if (t->io_min && t->io_opt % t->io_min)
- return -1;
+ ret = -1;
- return 0;
+ return ret;
}
EXPORT_SYMBOL(blk_stack_limits);