Commit cdfda633 authored by Philipp Reisner's avatar Philipp Reisner
Browse files

drbd: detach from frozen backing device 



* drbd-8.3:
  documentation: Documented detach's --force and disk's --disk-timeout
  drbd: Implemented the disk-timeout option
  drbd: Force flag for the detach operation
  drbd: Allow new IOs while the local disk in in FAILED state
  drbd: Bitmap IO functions can not return prematurely if the disk breaks
  drbd: Added a kref to bm_aio_ctx
  drbd: Hold a reference to ldev while doing meta-data IO
  drbd: Keep a reference to the bio until the completion handler finished
  drbd: Implemented wait_until_done_or_disk_failure()
  drbd: Replaced md_io_mutex by an atomic: md_io_in_use
  drbd: moved md_io into mdev
  drbd: Immediately allow completion of IOs, that wait for IO completions on a failed disk
  drbd: Keep a reference to barrier acked requests

Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent 2fcb8f30

drivers/block/drbd/drbd_actlog.c

+58 −17
Original line number Diff line number Diff line
@@ -114,18 +114,44 @@ struct drbd_atodb_wait { 


static int w_al_write_transaction(struct drbd_work *, int);



void *drbd_md_get_buffer(struct drbd_conf *mdev)

{

	int r;



	wait_event(mdev->misc_wait,

		   (r = atomic_cmpxchg(&mdev->md_io_in_use, 0, 1)) == 0 ||

		   mdev->state.disk <= D_FAILED);



	return r ? NULL : page_address(mdev->md_io_page);

}



void drbd_md_put_buffer(struct drbd_conf *mdev)

{

	if (atomic_dec_and_test(&mdev->md_io_in_use))

		wake_up(&mdev->misc_wait);

}



static bool md_io_allowed(struct drbd_conf *mdev)

{

	enum drbd_disk_state ds = mdev->state.disk;

	return ds >= D_NEGOTIATING || ds == D_ATTACHING;

}



void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done)

{

	wait_event(mdev->misc_wait, *done || !md_io_allowed(mdev));

}



static int _drbd_md_sync_page_io(struct drbd_conf *mdev,

				 struct drbd_backing_dev *bdev,

				 struct page *page, sector_t sector,

				 int rw, int size)

{

	struct bio *bio;

	struct drbd_md_io md_io;

	int err;



	md_io.mdev = mdev;

	init_completion(&md_io.event);

	md_io.error = 0;

	mdev->md_io.done = 0;

	mdev->md_io.error = -ENODEV;



	if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))

		rw |= REQ_FUA | REQ_FLUSH;
@@ -137,17 +163,25 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev, 
	err = -EIO;

	if (bio_add_page(bio, page, size, 0) != size)

		goto out;

	bio->bi_private = &md_io;

	bio->bi_private = &mdev->md_io;

	bio->bi_end_io = drbd_md_io_complete;

	bio->bi_rw = rw;



	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* Corresponding put_ldev in drbd_md_io_complete() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n");

		err = -ENODEV;

		goto out;

	}



	bio_get(bio); /* one bio_put() is in the completion handler */

	atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */

	if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))

		bio_endio(bio, -EIO);

	else

		submit_bio(rw, bio);

	wait_for_completion(&md_io.event);

	wait_until_done_or_disk_failure(mdev, &mdev->md_io.done);

	if (bio_flagged(bio, BIO_UPTODATE))

		err = md_io.error;

		err = mdev->md_io.error;



 out:

	bio_put(bio);
@@ -160,7 +194,7 @@ int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, 
	int err;

	struct page *iop = mdev->md_io_page;



	D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));

	D_ASSERT(atomic_read(&mdev->md_io_in_use) == 1);



	BUG_ON(!bdev->md_bdev);
@@ -344,8 +378,14 @@ w_al_write_transaction(struct drbd_work *w, int unused) 
		return 0;

	}



	mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */

	buffer = page_address(mdev->md_io_page);

	buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */

	if (!buffer) {

		dev_err(DEV, "disk failed while waiting for md_io buffer\n");

		aw->err = -EIO;

		complete(&((struct update_al_work *)w)->event);

		put_ldev(mdev);

		return 1;

	}



	memset(buffer, 0, sizeof(*buffer));

	buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
@@ -415,7 +455,7 @@ w_al_write_transaction(struct drbd_work *w, int unused) 
		mdev->al_tr_number++;

	}



	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);

	complete(&((struct update_al_work *)w)->event);

	put_ldev(mdev);
@@ -506,8 +546,9 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
	/* lock out all other meta data io for now,

	 * and make sure the page is mapped.

	 */

	mutex_lock(&mdev->md_io_mutex);

	b = page_address(mdev->md_io_page);

	b = drbd_md_get_buffer(mdev);

	if (!b)

		return 0;



	/* Always use the full ringbuffer space for now.

	 * possible optimization: read in all of it,
@@ -528,7 +569,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 


		/* IO error */

		if (rv == -1) {

			mutex_unlock(&mdev->md_io_mutex);

			drbd_md_put_buffer(mdev);

			return 0;

		}
@@ -558,7 +599,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
	if (!found_valid) {

		if (found_initialized != mx)

			dev_warn(DEV, "No usable activity log found.\n");

		mutex_unlock(&mdev->md_io_mutex);

		drbd_md_put_buffer(mdev);

		return 1;

	}
@@ -573,7 +614,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
		if (!expect(rv != 0))

			goto cancel;

		if (rv == -1) {

			mutex_unlock(&mdev->md_io_mutex);

			drbd_md_put_buffer(mdev);

			return 0;

		}
@@ -643,7 +684,7 @@ cancel: 
	mdev->al_tr_pos = (to + 1) % (MD_AL_SECTORS*512/MD_BLOCK_SIZE);



	/* ok, we are done with it */

	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);



	dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",

	     transactions, active_extents);

drivers/block/drbd/drbd_bitmap.c

+85 −30
Original line number Diff line number Diff line
@@ -918,13 +918,22 @@ void drbd_bm_clear_all(struct drbd_conf *mdev) 
struct bm_aio_ctx {

	struct drbd_conf *mdev;

	atomic_t in_flight;

	struct completion done;

	unsigned int done;

	unsigned flags;

#define BM_AIO_COPY_PAGES	1

#define BM_AIO_WRITE_HINTED	2

	int error;

	struct kref kref;

};



static void bm_aio_ctx_destroy(struct kref *kref)

{

	struct bm_aio_ctx *ctx = container_of(kref, struct bm_aio_ctx, kref);



	put_ldev(ctx->mdev);

	kfree(ctx);

}



/* bv_page may be a copy, or may be the original */

static void bm_async_io_complete(struct bio *bio, int error)

{
@@ -968,13 +977,16 @@ static void bm_async_io_complete(struct bio *bio, int error) 


	bio_put(bio);



	if (atomic_dec_and_test(&ctx->in_flight))

		complete(&ctx->done);

	if (atomic_dec_and_test(&ctx->in_flight)) {

		ctx->done = 1;

		wake_up(&mdev->misc_wait);

		kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	}

}



static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)

{

	struct bio *bio = bio_alloc_drbd(GFP_KERNEL);

	struct bio *bio = bio_alloc_drbd(GFP_NOIO);

	struct drbd_conf *mdev = ctx->mdev;

	struct drbd_bitmap *b = mdev->bitmap;

	struct page *page;
@@ -1032,12 +1044,7 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must 
 */

static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_writeout_upper_idx) __must_hold(local)

{

	struct bm_aio_ctx ctx = {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),

		.flags = flags,

	};

	struct bm_aio_ctx *ctx;

	struct drbd_bitmap *b = mdev->bitmap;

	int num_pages, i, count = 0;

	unsigned long now;
@@ -1052,7 +1059,27 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w 
	 * For lazy writeout, we don't care for ongoing changes to the bitmap,

	 * as we submit copies of pages anyways.

	 */

	if (!ctx.flags)



	ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);

	if (!ctx)

		return -ENOMEM;



	*ctx = (struct bm_aio_ctx) {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = 0,

		.flags = flags,

		.error = 0,

		.kref = { ATOMIC_INIT(2) },

	};



	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* put is in bm_aio_ctx_destroy() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in bm_rw()\n");

		err = -ENODEV;

		goto out;

	}



	if (!ctx->flags)

		WARN_ON(!(BM_LOCKED_MASK & b->bm_flags));



	num_pages = b->bm_number_of_pages;
@@ -1081,19 +1108,24 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w 
				continue;

			}

		}

		atomic_inc(&ctx.in_flight);

		bm_page_io_async(&ctx, i, rw);

		atomic_inc(&ctx->in_flight);

		bm_page_io_async(ctx, i, rw);

		++count;

		cond_resched();

	}



	/*

	 * We initialize ctx.in_flight to one to make sure bm_async_io_complete

	 * will not complete() early, and decrement / test it here.  If there

	 * We initialize ctx->in_flight to one to make sure bm_async_io_complete

	 * will not set ctx->done early, and decrement / test it here.  If there

	 * are still some bios in flight, we need to wait for them here.

	 * If all IO is done already (or nothing had been submitted), there is

	 * no need to wait.  Still, we need to put the kref associated with the

	 * "in_flight reached zero, all done" event.

	 */

	if (!atomic_dec_and_test(&ctx.in_flight))

		wait_for_completion(&ctx.done);

	if (!atomic_dec_and_test(&ctx->in_flight))

		wait_until_done_or_disk_failure(mdev, &ctx->done);

	else

		kref_put(&ctx->kref, &bm_aio_ctx_destroy);



	/* summary for global bitmap IO */

	if (flags == 0)
@@ -1101,12 +1133,15 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w 
			 rw == WRITE ? "WRITE" : "READ",

			 count, jiffies - now);



	if (ctx.error) {

	if (ctx->error) {

		dev_alert(DEV, "we had at least one MD IO ERROR during bitmap IO\n");

		drbd_chk_io_error(mdev, 1, true);

		err = -EIO; /* ctx.error ? */

		err = -EIO; /* ctx->error ? */

	}



	if (atomic_read(&ctx->in_flight))

		err = -EIO; /* Disk failed during IO... */



	now = jiffies;

	if (rw == WRITE) {

		drbd_md_flush(mdev);
@@ -1121,6 +1156,8 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w 
		dev_info(DEV, "%s (%lu bits) marked out-of-sync by on disk bit-map.\n",

		     ppsize(ppb, now << (BM_BLOCK_SHIFT-10)), now);



out:

	kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	return err;

}
@@ -1177,28 +1214,46 @@ int drbd_bm_write_hinted(struct drbd_conf *mdev) __must_hold(local) 
 */

int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)

{

	struct bm_aio_ctx ctx = {

	struct bm_aio_ctx *ctx;

	int err;



	if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {

		dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);

		return 0;

	}



	ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);

	if (!ctx)

		return -ENOMEM;



	*ctx = (struct bm_aio_ctx) {

		.mdev = mdev,

		.in_flight = ATOMIC_INIT(1),

		.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),

		.done = 0,

		.flags = BM_AIO_COPY_PAGES,

		.error = 0,

		.kref = { ATOMIC_INIT(2) },

	};



	if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {

		dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);

		return 0;

	if (!get_ldev_if_state(mdev, D_ATTACHING)) {  /* put is in bm_aio_ctx_destroy() */

		dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in drbd_bm_write_page()\n");

		err = -ENODEV;

		goto out;

	}



	bm_page_io_async(&ctx, idx, WRITE_SYNC);

	wait_for_completion(&ctx.done);

	bm_page_io_async(ctx, idx, WRITE_SYNC);

	wait_until_done_or_disk_failure(mdev, &ctx->done);



	if (ctx.error)

	if (ctx->error)

		drbd_chk_io_error(mdev, 1, true);

		/* that should force detach, so the in memory bitmap will be

		 * gone in a moment as well. */



	mdev->bm_writ_cnt++;

	return ctx.error;

	err = atomic_read(&ctx->in_flight) ? -EIO : ctx->error;

 out:

	kref_put(&ctx->kref, &bm_aio_ctx_destroy);

	return err;

}



/* NOTE

drivers/block/drbd/drbd_int.h

+8 −4
Original line number Diff line number Diff line
@@ -780,8 +780,7 @@ struct drbd_backing_dev { 
};



struct drbd_md_io {

	struct drbd_conf *mdev;

	struct completion event;

	unsigned int done;

	int error;

};
@@ -852,6 +851,7 @@ struct drbd_tconn { /* is a resource from the config file */ 
	struct drbd_tl_epoch *newest_tle;

	struct drbd_tl_epoch *oldest_tle;

	struct list_head out_of_sequence_requests;

	struct list_head barrier_acked_requests;



	struct crypto_hash *cram_hmac_tfm;

	struct crypto_hash *integrity_tfm;  /* checksums we compute, updates protected by tconn->data->mutex */
@@ -978,7 +978,8 @@ struct drbd_conf { 
	atomic_t pp_in_use_by_net;	/* sendpage()d, still referenced by tcp */

	wait_queue_head_t ee_wait;

	struct page *md_io_page;	/* one page buffer for md_io */

	struct mutex md_io_mutex;	/* protects the md_io_buffer */

	struct drbd_md_io md_io;

	atomic_t md_io_in_use;		/* protects the md_io, md_io_page and md_io_tmpp */

	spinlock_t al_lock;

	wait_queue_head_t al_wait;

	struct lru_cache *act_log;	/* activity log */
@@ -1424,9 +1425,12 @@ extern void resume_next_sg(struct drbd_conf *mdev); 
extern void suspend_other_sg(struct drbd_conf *mdev);

extern int drbd_resync_finished(struct drbd_conf *mdev);

/* maybe rather drbd_main.c ? */

extern void *drbd_md_get_buffer(struct drbd_conf *mdev);

extern void drbd_md_put_buffer(struct drbd_conf *mdev);

extern int drbd_md_sync_page_io(struct drbd_conf *mdev,

		struct drbd_backing_dev *bdev, sector_t sector, int rw);

extern void drbd_ov_out_of_sync_found(struct drbd_conf *, sector_t, int);

extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done);

extern void drbd_rs_controller_reset(struct drbd_conf *mdev);



static inline void ov_out_of_sync_print(struct drbd_conf *mdev)
@@ -2151,12 +2155,12 @@ static inline int drbd_state_is_stable(struct drbd_conf *mdev) 
	case D_OUTDATED:

	case D_CONSISTENT:

	case D_UP_TO_DATE:

	case D_FAILED:

		/* disk state is stable as well. */

		break;



	/* no new io accepted during transitional states */

	case D_ATTACHING:

	case D_FAILED:

	case D_NEGOTIATING:

	case D_UNKNOWN:

	case D_MASK:

drivers/block/drbd/drbd_main.c

+68 −9
Original line number Diff line number Diff line
@@ -215,6 +215,7 @@ static int tl_init(struct drbd_tconn *tconn) 
	tconn->oldest_tle = b;

	tconn->newest_tle = b;

	INIT_LIST_HEAD(&tconn->out_of_sequence_requests);

	INIT_LIST_HEAD(&tconn->barrier_acked_requests);



	return 1;

}
@@ -315,7 +316,7 @@ void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr, 
	   These have been list_move'd to the out_of_sequence_requests list in

	   _req_mod(, BARRIER_ACKED) above.

	   */

	list_del_init(&b->requests);

	list_splice_init(&b->requests, &tconn->barrier_acked_requests);

	mdev = b->w.mdev;



	nob = b->next;
@@ -417,8 +418,23 @@ void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) 
		b = tmp;

		list_splice(&carry_reads, &b->requests);

	}

}



	/* Actions operating on the disk state, also want to work on

	   requests that got barrier acked. */

	switch (what) {

	case FAIL_FROZEN_DISK_IO:

	case RESTART_FROZEN_DISK_IO:

		list_for_each_safe(le, tle, &tconn->barrier_acked_requests) {

			req = list_entry(le, struct drbd_request, tl_requests);

			_req_mod(req, what);

		}

	case CONNECTION_LOST_WHILE_PENDING:

	case RESEND:

		break;

	default:

		conn_err(tconn, "what = %d in _tl_restart()\n", what);

	}

}



/**

 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
@@ -467,6 +483,42 @@ void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) 
	spin_unlock_irq(&tconn->req_lock);

}



/**

 * tl_apply() - Applies an event to all requests for a certain mdev in the TL

 * @mdev:	DRBD device.

 * @what:       The action/event to perform with all request objects

 *

 * @what might ony be ABORT_DISK_IO.

 */

void tl_apply(struct drbd_conf *mdev, enum drbd_req_event what)

{

	struct drbd_tconn *tconn = mdev->tconn;

	struct drbd_tl_epoch *b;

	struct list_head *le, *tle;

	struct drbd_request *req;



	D_ASSERT(what == ABORT_DISK_IO);



	spin_lock_irq(&tconn->req_lock);

	b = tconn->oldest_tle;

	while (b) {

		list_for_each_safe(le, tle, &b->requests) {

			req = list_entry(le, struct drbd_request, tl_requests);

			if (req->w.mdev == mdev)

				_req_mod(req, what);

		}

		b = b->next;

	}



	list_for_each_safe(le, tle, &tconn->barrier_acked_requests) {

		req = list_entry(le, struct drbd_request, tl_requests);

		if (req->w.mdev == mdev)

			_req_mod(req, what);

	}



	spin_unlock_irq(&tconn->req_lock);

}



static int drbd_thread_setup(void *arg)

{

	struct drbd_thread *thi = (struct drbd_thread *) arg;
@@ -2003,8 +2055,8 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) 
	atomic_set(&mdev->rs_sect_in, 0);

	atomic_set(&mdev->rs_sect_ev, 0);

	atomic_set(&mdev->ap_in_flight, 0);

	atomic_set(&mdev->md_io_in_use, 0);



	mutex_init(&mdev->md_io_mutex);

	mutex_init(&mdev->own_state_mutex);

	mdev->state_mutex = &mdev->own_state_mutex;
@@ -2282,6 +2334,8 @@ void drbd_minor_destroy(struct kref *kref) 
	struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref);

	struct drbd_tconn *tconn = mdev->tconn;



	del_timer_sync(&mdev->request_timer);



	/* paranoia asserts */

	D_ASSERT(mdev->open_cnt == 0);

	D_ASSERT(list_empty(&mdev->tconn->data.work.q));
@@ -2868,8 +2922,10 @@ void drbd_md_sync(struct drbd_conf *mdev) 
	if (!get_ldev_if_state(mdev, D_FAILED))

		return;



	mutex_lock(&mdev->md_io_mutex);

	buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);

	buffer = drbd_md_get_buffer(mdev);

	if (!buffer)

		goto out;



	memset(buffer, 0, 512);



	buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
@@ -2900,7 +2956,8 @@ void drbd_md_sync(struct drbd_conf *mdev) 
	 * since we updated it on metadata. */

	mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);



	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);

out:

	put_ldev(mdev);

}
@@ -2920,8 +2977,9 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
	if (!get_ldev_if_state(mdev, D_ATTACHING))

		return ERR_IO_MD_DISK;



	mutex_lock(&mdev->md_io_mutex);

	buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);

	buffer = drbd_md_get_buffer(mdev);

	if (!buffer)

		goto out;



	if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {

		/* NOTE: can't do normal error processing here as this is
@@ -2983,7 +3041,8 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) 
		bdev->disk_conf->al_extents = DRBD_AL_EXTENTS_DEF;



 err:

	mutex_unlock(&mdev->md_io_mutex);

	drbd_md_put_buffer(mdev);

 out:

	put_ldev(mdev);



	return rv;

drivers/block/drbd/drbd_nl.c

+25 −3
Original line number Diff line number Diff line
@@ -1236,6 +1236,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info) 
	synchronize_rcu();

	kfree(old_disk_conf);

	kfree(old_plan);

	mod_timer(&mdev->request_timer, jiffies + HZ);

	goto success;



fail_unlock:
@@ -1628,6 +1629,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) 
	if (rv < SS_SUCCESS)

		goto force_diskless_dec;



	mod_timer(&mdev->request_timer, jiffies + HZ);



	if (mdev->state.role == R_PRIMARY)

		mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;

	else
@@ -1667,10 +1670,17 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) 
	return 0;

}



static int adm_detach(struct drbd_conf *mdev)

static int adm_detach(struct drbd_conf *mdev, int force)

{

	enum drbd_state_rv retcode;

	int ret;



	if (force) {

		drbd_force_state(mdev, NS(disk, D_FAILED));

		retcode = SS_SUCCESS;

		goto out;

	}



	drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */

	retcode = drbd_request_state(mdev, NS(disk, D_FAILED));

	/* D_FAILED will transition to DISKLESS. */
@@ -1681,6 +1691,7 @@ static int adm_detach(struct drbd_conf *mdev) 
		retcode = SS_NOTHING_TO_DO;

	if (ret)

		retcode = ERR_INTR;

out:

	return retcode;

}
@@ -1692,6 +1703,8 @@ static int adm_detach(struct drbd_conf *mdev) 
int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)

{

	enum drbd_ret_code retcode;

	struct detach_parms parms = { };

	int err;



	retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);

	if (!adm_ctx.reply_skb)
@@ -1699,7 +1712,16 @@ int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info) 
	if (retcode != NO_ERROR)

		goto out;



	retcode = adm_detach(adm_ctx.mdev);

	if (info->attrs[DRBD_NLA_DETACH_PARMS]) {

		err = detach_parms_from_attrs(&parms, info);

		if (err) {

			retcode = ERR_MANDATORY_TAG;

			drbd_msg_put_info(from_attrs_err_to_txt(err));

			goto out;

		}

	}



	retcode = adm_detach(adm_ctx.mdev, parms.force_detach);

out:

	drbd_adm_finish(info, retcode);

	return 0;
@@ -3116,7 +3138,7 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info) 


	/* detach */

	idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {

		retcode = adm_detach(mdev);

		retcode = adm_detach(mdev, 0);

		if (retcode < SS_SUCCESS) {

			drbd_msg_put_info("failed to detach");

			goto out;

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