queue_sector_alignment_offset returned the wrong value which caused
partitions to report an incorrect alignment_offset. Since offset
calculation is needed several places it has been split into a separate
helper function.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Tested-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
include/linux/blkdev.h | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 784a919..59b832b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1116,11 +1116,18 @@ static inline int queue_alignment_offset(struct request_queue *q)
return q->limits.alignment_offset;
}
+static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t offset)
+{
+ unsigned int granularity = max(lim->physical_block_size, lim->io_min);
+
+ offset &= granularity - 1;
+ return (granularity + lim->alignment_offset - offset) & (granularity - 1);
+}
+
static inline int queue_sector_alignment_offset(struct request_queue *q,
sector_t sector)
{
- return ((sector << 9) - q->limits.alignment_offset)
- & (q->limits.io_min - 1);
+ return queue_limit_alignment_offset(&q->limits, sector << 9);
}
static inline int bdev_alignment_offset(struct block_device *bdev)
--
1.6.0.6
--
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