[PATCH 42/45] block: switch disk_part_iter_* to use a struct block_device

Christoph Hellwig
2020-11-28T22:08:13Z

Switch the partition iter infrastructure to iterate over block_device
references instead of hd_struct ones mostly used to get at the
block_device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/genhd.c | 59 ++++++++++++++++++++-------------------
block/partitions/core.c | 13 ++++-----
drivers/s390/block/dasd.c | 8 +++---
include/linux/genhd.h | 4 +--
4 files changed, 42 insertions(+), 42 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 28ced566c07bb7..e83174818b543a 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -236,7 +236,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_init);
* CONTEXT:
* Don't care.
*/
-struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
+struct block_device *disk_part_iter_next(struct disk_part_iter *piter)
{
struct disk_part_tbl *ptbl;
int inc, end;
@@ -274,8 +274,9 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
piter->idx == 0))
continue;

- get_device(part_to_dev(part->bd_part));
- piter->part = part->bd_part;
+ piter->part = bdgrab(part);
+ if (!piter->part)
+ continue;
piter->idx += inc;
break;
}
@@ -297,7 +298,8 @@ EXPORT_SYMBOL_GPL(disk_part_iter_next);
*/
void disk_part_iter_exit(struct disk_part_iter *piter)
{
- disk_put_part(piter->part);
+ if (piter->part)
+ bdput(piter->part);
piter->part = NULL;
}
EXPORT_SYMBOL_GPL(disk_part_iter_exit);
@@ -338,7 +340,6 @@ struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector)

for (i = 1; i < ptbl->len; i++) {
part = rcu_dereference(ptbl->part[i]);
-
if (part && sector_in_part(part, sector)) {
rcu_assign_pointer(ptbl->last_lookup, part);
goto out_unlock;
@@ -639,7 +640,7 @@ static void register_disk(struct device *parent, struct gendisk *disk,
{
struct device *ddev = disk_to_dev(disk);
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;
int err;

ddev->parent = parent;
@@ -689,7 +690,7 @@ static void register_disk(struct device *parent, struct gendisk *disk,
/* announce possible partitions */
disk_part_iter_init(&piter, disk, 0);
while ((part = disk_part_iter_next(&piter)))
- kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
+ kobject_uevent(bdev_kobj(part), KOBJ_ADD);
disk_part_iter_exit(&piter);

if (disk->queue->backing_dev_info->dev) {
@@ -829,7 +830,7 @@ static void invalidate_partition(struct block_device *bdev)
void del_gendisk(struct gendisk *disk)
{
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;

might_sleep();

@@ -849,8 +850,8 @@ void del_gendisk(struct gendisk *disk)
disk_part_iter_init(&piter, disk,
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
while ((part = disk_part_iter_next(&piter))) {
- invalidate_partition(part->bdev);
- delete_partition(part);
+ invalidate_partition(part);
+ delete_partition(part->bd_part);
}
disk_part_iter_exit(&piter);

@@ -969,7 +970,7 @@ void __init printk_all_partitions(void)
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;
char name_buf[BDEVNAME_SIZE];
char devt_buf[BDEVT_SIZE];

@@ -988,14 +989,14 @@ void __init printk_all_partitions(void)
*/
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter))) {
- bool is_part0 = part == disk->part0->bd_part;
+ bool is_part0 = part == disk->part0;

printk("%s%s %10llu %s %s", is_part0 ? "" : " ",
- bdevt_str(part_devt(part), devt_buf),
- bdev_nr_sectors(part->bdev) >> 1,
- disk_name(disk, part->bdev->bd_partno, name_buf),
- part->bdev->bd_meta_info ?
- part->bdev->bd_meta_info->uuid : "");
+ bdevt_str(part->bd_dev, devt_buf),
+ bdev_nr_sectors(part) >> 1,
+ disk_name(disk, part->bd_partno, name_buf),
+ part->bd_meta_info ?
+ part->bd_meta_info->uuid : "");
if (is_part0) {
if (dev->parent && dev->parent->driver)
printk(" driver: %s\n",
@@ -1071,7 +1072,7 @@ static int show_partition(struct seq_file *seqf, void *v)
{
struct gendisk *sgp = v;
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;
char buf[BDEVNAME_SIZE];

/* Don't show non-partitionable removeable devices or empty devices */
@@ -1085,9 +1086,9 @@ static int show_partition(struct seq_file *seqf, void *v)
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter)))
seq_printf(seqf, "%4d %7d %10llu %s\n",
- MAJOR(part_devt(part)), MINOR(part_devt(part)),
- bdev_nr_sectors(part->bdev) >> 1,
- disk_name(sgp, part->bdev->bd_partno, buf));
+ 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);

return 0;
@@ -1481,7 +1482,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
{
struct gendisk *gp = v;
struct disk_part_iter piter;
- struct hd_struct *hd;
+ struct block_device *hd;
char buf[BDEVNAME_SIZE];
unsigned int inflight;
struct disk_stats stat;
@@ -1496,11 +1497,11 @@ static int diskstats_show(struct seq_file *seqf, void *v)

disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0);
while ((hd = disk_part_iter_next(&piter))) {
- part_stat_read_all(hd, &stat);
+ part_stat_read_all(hd->bd_part, &stat);
if (queue_is_mq(gp->queue))
- inflight = blk_mq_in_flight(gp->queue, hd->bdev);
+ inflight = blk_mq_in_flight(gp->queue, hd);
else
- inflight = part_in_flight(hd->bdev);
+ inflight = part_in_flight(hd);

seq_printf(seqf, "%4d %7d %s "
"%lu %lu %lu %u "
@@ -1509,8 +1510,8 @@ static int diskstats_show(struct seq_file *seqf, void *v)
"%lu %lu %lu %u "
"%lu %u"
"\n",
- MAJOR(part_devt(hd)), MINOR(part_devt(hd)),
- disk_name(gp, hd->bdev->bd_partno, buf),
+ MAJOR(hd->bd_dev), MINOR(hd->bd_dev),
+ disk_name(gp, hd->bd_partno, buf),
stat.ios[STAT_READ],
stat.merges[STAT_READ],
stat.sectors[STAT_READ],
@@ -1665,7 +1666,7 @@ static void set_disk_ro_uevent(struct gendisk *gd, int ro)
void set_disk_ro(struct gendisk *disk, int flag)
{
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;

if (disk->part0->bd_read_only != flag) {
set_disk_ro_uevent(disk, flag);
@@ -1674,7 +1675,7 @@ void set_disk_ro(struct gendisk *disk, int flag)

disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
- part->bdev->bd_read_only = flag;
+ part->bd_read_only = flag;
disk_part_iter_exit(&piter);
}

diff --git a/block/partitions/core.c b/block/partitions/core.c
index 3d8243334c7cb4..4cb6df175f9077 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -439,15 +439,14 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start,
sector_t length, int skip_partno)
{
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;
bool overlap = false;

disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter))) {
- if (part->bdev->bd_partno == skip_partno ||
- start >= part->bdev->bd_start_sect +
- bdev_nr_sectors(part->bdev) ||
- start + length <= part->bdev->bd_start_sect)
+ if (part->bd_partno == skip_partno ||
+ start >= part->bd_start_sect + bdev_nr_sectors(part) ||
+ start + length <= part->bd_start_sect)
continue;
overlap = true;
break;
@@ -568,7 +567,7 @@ static bool disk_unlock_native_capacity(struct gendisk *disk)
int blk_drop_partitions(struct block_device *bdev)
{
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;

if (bdev->bd_part_count)
return -EBUSY;
@@ -578,7 +577,7 @@ int blk_drop_partitions(struct block_device *bdev)

disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
- delete_partition(part);
+ delete_partition(part->bd_part);
disk_part_iter_exit(&piter);

return 0;
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index db24e04ee9781e..1825fa8d05a780 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -432,7 +432,7 @@ dasd_state_ready_to_online(struct dasd_device * device)
{
struct gendisk *disk;
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;

device->state = DASD_STATE_ONLINE;
if (device->block) {
@@ -445,7 +445,7 @@ dasd_state_ready_to_online(struct dasd_device * device)
disk = device->block->bdev->bd_disk;
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter)))
- kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
+ kobject_uevent(bdev_kobj(part), KOBJ_CHANGE);
disk_part_iter_exit(&piter);
}
return 0;
@@ -459,7 +459,7 @@ static int dasd_state_online_to_ready(struct dasd_device *device)
int rc;
struct gendisk *disk;
struct disk_part_iter piter;
- struct hd_struct *part;
+ struct block_device *part;

if (device->discipline->online_to_ready) {
rc = device->discipline->online_to_ready(device);
@@ -472,7 +472,7 @@ static int dasd_state_online_to_ready(struct dasd_device *device)
disk = device->block->bdev->bd_disk;
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter)))
- kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
+ kobject_uevent(bdev_kobj(part), KOBJ_CHANGE);
disk_part_iter_exit(&piter);
}
return 0;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 3c13d4708e3f9d..cd23c80265b2b2 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -244,14 +244,14 @@ static inline void disk_put_part(struct hd_struct *part)

struct disk_part_iter {
struct gendisk *disk;
- struct hd_struct *part;
+ struct block_device *part;
int idx;
unsigned int flags;
};

extern void disk_part_iter_init(struct disk_part_iter *piter,
struct gendisk *disk, unsigned int flags);
-extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
+struct block_device *disk_part_iter_next(struct disk_part_iter *piter);
extern void disk_part_iter_exit(struct disk_part_iter *piter);
extern bool disk_has_partitions(struct gendisk *disk);

--
2.29.2