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Revert "block: Remove extra discard_alignment from hd_struct."

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It was not a good idea to start dereferencing disk->queue from
the fs sysfs strategy for displaying discard alignment. We ran
into first a NULL pointer deref, and after fixing that we sometimes
see unvalid disk->queue pointer values.

Since discard is the only one of the bunch actually looking into
the queue, just revert the change.

This reverts commit 23ceb5b771.

Conflicts:
	fs/partitions/check.c
This commit is contained in:
Jens Axboe 2011-05-30 07:42:51 +02:00
parent 5988ce2396
commit a1706ac4c0
2 changed files with 4 additions and 7 deletions
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10
fs/partitions/check.c
View file

@ -255,13 +255,7 @@ ssize_t part_discard_alignment_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct gendisk *disk = dev_to_disk(dev);
unsigned int alignment = 0;
if (disk->queue)
alignment = queue_limit_discard_alignment(&disk->queue->limits,
p->start_sect);
return sprintf(buf, "%u\n", alignment);
return sprintf(buf, "%u\n", p->discard_alignment);
}
ssize_t part_stat_show(struct device *dev,
@ -455,6 +449,8 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
p->start_sect = start;
p->alignment_offset =
queue_limit_alignment_offset(&disk->queue->limits, start);
p->discard_alignment =
queue_limit_discard_alignment(&disk->queue->limits, start);
p->nr_sects = len;
p->partno = partno;
p->policy = get_disk_ro(disk);

1
include/linux/genhd.h
View file

@ -100,6 +100,7 @@ struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
sector_t alignment_offset;
unsigned int discard_alignment;
struct device __dev;
struct kobject *holder_dir;
int policy, partno;