Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
dm: lock limits when reading them
Lock queue limits when reading them, so that we don't read halfway
modified values.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
+7
-1
+7
-1
drivers/md/dm-table.c
+7
-1
drivers/md/dm-table.c
···
431
431
return 0;
432
432
}
433
433
434
+
mutex_lock(&q->limits_lock);
434
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if (blk_stack_limits(limits, &q->limits,
435
436
get_start_sect(bdev) + start) < 0)
436
437
DMWARN("%s: adding target device %pg caused an alignment inconsistency: "
···
449
448
*/
450
449
if (!dm_target_has_integrity(ti->type))
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queue_limits_stack_integrity_bdev(limits, bdev);
451
+
mutex_unlock(&q->limits_lock);
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452
return 0;
453
453
}
454
454
···
1736
1734
sector_t start, sector_t len, void *data)
1737
1735
{
1738
1736
struct request_queue *q = bdev_get_queue(dev->bdev);
1737
+
int b;
1739
1738
1740
-
return !q->limits.max_write_zeroes_sectors;
1739
+
mutex_lock(&q->limits_lock);
1740
+
b = !q->limits.max_write_zeroes_sectors;
1741
+
mutex_unlock(&q->limits_lock);
1742
+
return b;
1741
1743
}
1742
1744
1743
1745
static bool dm_table_supports_write_zeroes(struct dm_table *t)