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| author | Ming Lei <ming.lei@redhat.com> | 2020-05-08 16:17:58 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-12 20:31:40 -0600 |
| commit | 27eb3af9a37a85ca35f82830a8fc29753700058a (patch) | |
| tree | 5f0cc279819eb461e5ef994b862c44b4186b26f8 /block/blk.h | |
| parent | 520138c3b9425c615d1417687947d86821003319 (diff) | |
| download | linux-27eb3af9a37a85ca35f82830a8fc29753700058a.tar.gz linux-27eb3af9a37a85ca35f82830a8fc29753700058a.tar.bz2 linux-27eb3af9a37a85ca35f82830a8fc29753700058a.zip | |
block: don't hold part0's refcount in IO path
gendisk can't be gone when there is IO activity, so not hold
part0's refcount in IO path.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Cc: Yufen Yu <yuyufen@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Hou Tao <houtao1@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/block/blk.h b/block/blk.h index 73bd3b1c6938..8c3f557dd898 100644 --- a/block/blk.h +++ b/block/blk.h @@ -378,19 +378,18 @@ int bdev_resize_partition(struct block_device *bdev, int partno, int disk_expand_part_tbl(struct gendisk *disk, int target); int hd_ref_init(struct hd_struct *part); -static inline void hd_struct_get(struct hd_struct *part) -{ - percpu_ref_get(&part->ref); -} - +/* no need to get/put refcount of part0 */ static inline int hd_struct_try_get(struct hd_struct *part) { - return percpu_ref_tryget_live(&part->ref); + if (part->partno) + return percpu_ref_tryget_live(&part->ref); + return 1; } static inline void hd_struct_put(struct hd_struct *part) { - percpu_ref_put(&part->ref); + if (part->partno) + percpu_ref_put(&part->ref); } static inline void hd_free_part(struct hd_struct *part) |