block: Move bdi_unregister() to del_gendisk()

Commit 6cd18e711dd8 "block: destroy bdi before blockdev is
unregistered." moved bdi unregistration (at that time through
bdi_destroy()) from blk_release_queue() to blk_cleanup_queue() because
it needs to happen before blk_unregister_region() call in del_gendisk()
for MD. SCSI though will free up the device number from sd_remove()
called through a maze of callbacks from device_del() in
__scsi_remove_device() before blk_cleanup_queue() and thus similar races
as described in 6cd18e711dd8 can happen for SCSI as well as reported by
Omar [1].

Moving bdi_unregister() to del_gendisk() works for MD and fixes the
problem for SCSI since del_gendisk() gets called from sd_remove() before
freeing the device number.

This also makes device_add_disk() (calling bdi_register_owner()) more
symmetric with del_gendisk().

[1] http://marc.info/?l=linux-block&m=148554717109098&w=2

Tested-by: Lekshmi Pillai <lekshmicpillai@in.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Tested-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Git-commit: 165a5e22fafb127ecb5914e12e8c32a1f0d3f820
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
Change-Id: I006db1a645adffb79d6b2f46f5ccc94fa21dfd0a
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>

diff --git a/block/blk-core.c b/block/blk-core.c
index 4162327..500447b 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -609,8 +609,6 @@ void blk_cleanup_queue(struct request_queue *q)
                q->queue_lock = &q->__queue_lock;
        spin_unlock_irq(lock);
 
-       bdi_unregister(&q->backing_dev_info);
-
        /* @q is and will stay empty, shutdown and put */
        blk_put_queue(q);
 }

diff --git a/block/genhd.c b/block/genhd.c
index fad9db9..dae7c9e 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -656,6 +656,11 @@ void del_gendisk(struct gendisk *disk)
        disk->flags &= ~GENHD_FL_UP;
 
        sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
+       /*
+        * Unregister bdi before releasing device numbers (as they can get
+        * reused and we'd get clashes in sysfs).
+        */
+       bdi_unregister(&disk->queue->backing_dev_info);
        blk_unregister_queue(disk);
        blk_unregister_region(disk_devt(disk), disk->minors);