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block: delete partitions later in del_gendisk 

Delay dropping the block_devices for partitions in del_gendisk until
after the call to blk_mark_disk_dead, so that we can implementat
notification of removed devices in blk_mark_disk_dead.

This requires splitting a lower-level drop_partition helper out of
delete_partition and using that from del_gendisk, while having a
common loop for the whole device and partitions that calls
remove_inode_hash, fsync_bdev and __invalidate_device before the
call to blk_mark_disk_dead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-06-01 11:44:50 +02:00 committed by Jens Axboe
parent 69f90b70bd
commit eec1be4c30
3 changed files with 32 additions and 13 deletions
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2
block/blk.h
View File

@ -409,7 +409,7 @@ int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
int bdev_del_partition(struct gendisk *disk, int partno);
int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
void blk_drop_partitions(struct gendisk *disk);
void drop_partition(struct block_device *part);
void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors);

24
block/genhd.c
View File

@ -615,6 +615,8 @@ EXPORT_SYMBOL_GPL(blk_mark_disk_dead);
void del_gendisk(struct gendisk *disk)
{
struct request_queue *q = disk->queue;
struct block_device *part;
unsigned long idx;
might_sleep();
@ -623,16 +625,28 @@ void del_gendisk(struct gendisk *disk)
disk_del_events(disk);
/*
* Prevent new openers by unlinked the bdev inode, and write out
* dirty data before marking the disk dead and stopping all I/O.
*/
mutex_lock(&disk->open_mutex);
remove_inode_hash(disk->part0->bd_inode);
blk_drop_partitions(disk);
xa_for_each(&disk->part_tbl, idx, part) {
remove_inode_hash(part->bd_inode);
fsync_bdev(part);
__invalidate_device(part, true);
}
mutex_unlock(&disk->open_mutex);
fsync_bdev(disk->part0);
__invalidate_device(disk->part0, true);
blk_mark_disk_dead(disk);
/*
* Drop all partitions now that the disk is marked dead.
*/
mutex_lock(&disk->open_mutex);
xa_for_each_start(&disk->part_tbl, idx, part, 1)
drop_partition(part);
mutex_unlock(&disk->open_mutex);
if (!(disk->flags & GENHD_FL_HIDDEN)) {
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");

19
block/partitions/core.c
View File

@ -263,10 +263,19 @@ const struct device_type part_type = {
.uevent = part_uevent,
};
static void delete_partition(struct block_device *part)
void drop_partition(struct block_device *part)
{
lockdep_assert_held(&part->bd_disk->open_mutex);
xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
kobject_put(part->bd_holder_dir);
device_del(&part->bd_device);
put_device(&part->bd_device);
}
static void delete_partition(struct block_device *part)
{
/*
* Remove the block device from the inode hash, so that it cannot be
* looked up any more even when openers still hold references.
@ -276,11 +285,7 @@ static void delete_partition(struct block_device *part)
fsync_bdev(part);
__invalidate_device(part, true);
xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
kobject_put(part->bd_holder_dir);
device_del(&part->bd_device);
put_device(&part->bd_device);
drop_partition(part);
}
static ssize_t whole_disk_show(struct device *dev,
@ -519,7 +524,7 @@ static bool disk_unlock_native_capacity(struct gendisk *disk)
return true;
}
void blk_drop_partitions(struct gendisk *disk)
static void blk_drop_partitions(struct gendisk *disk)
{
struct block_device *part;
unsigned long idx;