diff options
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r-- | drivers/md/md.c | 67 |
1 files changed, 7 insertions, 60 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index d5ab449..fcd0987 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -498,61 +498,13 @@ void md_flush_request(struct mddev *mddev, struct bio *bio) } EXPORT_SYMBOL(md_flush_request); -/* Support for plugging. - * This mirrors the plugging support in request_queue, but does not - * require having a whole queue or request structures. - * We allocate an md_plug_cb for each md device and each thread it gets - * plugged on. This links tot the private plug_handle structure in the - * personality data where we keep a count of the number of outstanding - * plugs so other code can see if a plug is active. - */ -struct md_plug_cb { - struct blk_plug_cb cb; - struct mddev *mddev; -}; - -static void plugger_unplug(struct blk_plug_cb *cb) -{ - struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); - if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) - md_wakeup_thread(mdcb->mddev->thread); - kfree(mdcb); -} - -/* Check that an unplug wakeup will come shortly. - * If not, wakeup the md thread immediately - */ -int mddev_check_plugged(struct mddev *mddev) +void md_unplug(struct blk_plug_cb *cb, bool from_schedule) { - struct blk_plug *plug = current->plug; - struct md_plug_cb *mdcb; - - if (!plug) - return 0; - - list_for_each_entry(mdcb, &plug->cb_list, cb.list) { - if (mdcb->cb.callback == plugger_unplug && - mdcb->mddev == mddev) { - /* Already on the list, move to top */ - if (mdcb != list_first_entry(&plug->cb_list, - struct md_plug_cb, - cb.list)) - list_move(&mdcb->cb.list, &plug->cb_list); - return 1; - } - } - /* Not currently on the callback list */ - mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); - if (!mdcb) - return 0; - - mdcb->mddev = mddev; - mdcb->cb.callback = plugger_unplug; - atomic_inc(&mddev->plug_cnt); - list_add(&mdcb->cb.list, &plug->cb_list); - return 1; + struct mddev *mddev = cb->data; + md_wakeup_thread(mddev->thread); + kfree(cb); } -EXPORT_SYMBOL_GPL(mddev_check_plugged); +EXPORT_SYMBOL(md_unplug); static inline struct mddev *mddev_get(struct mddev *mddev) { @@ -602,7 +554,6 @@ void mddev_init(struct mddev *mddev) atomic_set(&mddev->active, 1); atomic_set(&mddev->openers, 0); atomic_set(&mddev->active_io, 0); - atomic_set(&mddev->plug_cnt, 0); spin_lock_init(&mddev->write_lock); atomic_set(&mddev->flush_pending, 0); init_waitqueue_head(&mddev->sb_wait); @@ -3942,17 +3893,13 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) break; case clear: /* stopping an active array */ - if (atomic_read(&mddev->openers) > 0) - return -EBUSY; err = do_md_stop(mddev, 0, NULL); break; case inactive: /* stopping an active array */ - if (mddev->pers) { - if (atomic_read(&mddev->openers) > 0) - return -EBUSY; + if (mddev->pers) err = do_md_stop(mddev, 2, NULL); - } else + else err = 0; /* already inactive */ break; case suspended: |