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block: Fix discard alignment calculation and printing 

Discard alignment reporting for partitions was incorrect.  Update to
match the algorithm used elsewhere.

The alignment can be negative (misaligned).  Fix format string
accordingly.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen 2010-01-11 03:21:48 -05:00 committed by Jens Axboe
parent fe0b393f2c
commit dd3d145d49
2 changed files with 6 additions and 3 deletions
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2
block/genhd.c
View File

@ -867,7 +867,7 @@ static ssize_t disk_discard_alignment_show(struct device *dev,
{
struct gendisk *disk = dev_to_disk(dev);
return sprintf(buf, "%u\n", queue_discard_alignment(disk->queue));
return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue));
}
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);

7
include/linux/blkdev.h
View File

@ -1148,8 +1148,11 @@ static inline int queue_discard_alignment(struct request_queue *q)
static inline int queue_sector_discard_alignment(struct request_queue *q,
sector_t sector)
{
return ((sector << 9) - q->limits.discard_alignment)
& (q->limits.discard_granularity - 1);
struct queue_limits *lim = &q->limits;
unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
return (lim->discard_granularity + lim->discard_alignment - alignment)
& (lim->discard_granularity - 1);
}
static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)