[PATCH 09/11] block: simplify show_partition

Christoph Hellwig
2021-04-06T06:23:31Z

Just use xa_for_each to iterate over the partitions as there is no need
to grab a reference to each partition.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/genhd.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 409ff4710f9215..5726714ef82fcf 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -907,8 +907,8 @@ static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
static int show_partition(struct seq_file *seqf, void *v)
{
struct gendisk *sgp = v;
- struct disk_part_iter piter;
struct block_device *part;
+ unsigned long idx;
char buf[BDEVNAME_SIZE];

/* Don't show non-partitionable removeable devices or empty devices */
@@ -918,15 +918,16 @@ static int show_partition(struct seq_file *seqf, void *v)
if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)
return 0;

- /* show the full disk and all non-0 size partitions of it */
- disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0);
- while ((part = disk_part_iter_next(&piter)))
+ rcu_read_lock();
+ xa_for_each(&sgp->part_tbl, idx, part) {
+ if (!bdev_nr_sectors(part))
+ continue;
seq_printf(seqf, "%4d %7d %10llu %s\n",
MAJOR(part->bd_dev), MINOR(part->bd_dev),
bdev_nr_sectors(part) >> 1,
disk_name(sgp, part->bd_partno, buf));
- disk_part_iter_exit(&piter);
-
+ }
+ rcu_read_unlock();
return 0;
}

--
2.30.1