Merge tag 'v3.9-rc5' into wq/for-3.10

Writeback conversion to workqueue will be based on top of wq/for-3.10
branch to take advantage of custom attrs and NUMA support for unbound
workqueues.  Mainline currently contains two commits which result in
non-trivial merge conflicts with wq/for-3.10 and because
block/for-3.10/core is based on v3.9-rc3 which contains one of the
conflicting commits, we need a pre-merge-window merge anyway.  Let's
pull v3.9-rc5 into wq/for-3.10 so that the block tree doesn't suffer
from workqueue merge conflicts.

The two conflicts and their resolutions:

* e68035fb65 ("workqueue: convert to idr_alloc()") in mainline changes
  worker_pool_assign_id() to use idr_alloc() instead of the old idr
  interface.  worker_pool_assign_id() goes through multiple locking
  changes in wq/for-3.10 causing the following conflict.

  static int worker_pool_assign_id(struct worker_pool *pool)
  {
	  int ret;

  <<<<<<< HEAD
	  lockdep_assert_held(&wq_pool_mutex);

	  do {
		  if (!idr_pre_get(&worker_pool_idr, GFP_KERNEL))
			  return -ENOMEM;
		  ret = idr_get_new(&worker_pool_idr, pool, &pool->id);
	  } while (ret == -EAGAIN);
  =======
	  mutex_lock(&worker_pool_idr_mutex);
	  ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_KERNEL);
	  if (ret >= 0)
		  pool->id = ret;
	  mutex_unlock(&worker_pool_idr_mutex);
  >>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89

	  return ret < 0 ? ret : 0;
  }

  We want locking from the former and idr_alloc() usage from the
  latter, which can be combined to the following.

  static int worker_pool_assign_id(struct worker_pool *pool)
  {
	  int ret;

	  lockdep_assert_held(&wq_pool_mutex);

	  ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_KERNEL);
	  if (ret >= 0) {
		  pool->id = ret;
		  return 0;
	  }
	  return ret;
   }

* eb2834285c ("workqueue: fix possible pool stall bug in
  wq_unbind_fn()") updated wq_unbind_fn() such that it has single
  larger for_each_std_worker_pool() loop instead of two separate loops
  with a schedule() call inbetween.  wq/for-3.10 renamed
  pool->assoc_mutex to pool->manager_mutex causing the following
  conflict (earlier function body and comments omitted for brevity).

  static void wq_unbind_fn(struct work_struct *work)
  {
  ...
		  spin_unlock_irq(&pool->lock);
  <<<<<<< HEAD
		  mutex_unlock(&pool->manager_mutex);
	  }
  =======
		  mutex_unlock(&pool->assoc_mutex);
  >>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89

		  schedule();

  <<<<<<< HEAD
	  for_each_cpu_worker_pool(pool, cpu)
  =======
  >>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89
		  atomic_set(&pool->nr_running, 0);

		  spin_lock_irq(&pool->lock);
		  wake_up_worker(pool);
		  spin_unlock_irq(&pool->lock);
	  }
  }

  The resolution is mostly trivial.  We want the control flow of the
  latter with the rename of the former.

  static void wq_unbind_fn(struct work_struct *work)
  {
  ...
		  spin_unlock_irq(&pool->lock);
		  mutex_unlock(&pool->manager_mutex);

		  schedule();

		  atomic_set(&pool->nr_running, 0);

		  spin_lock_irq(&pool->lock);
		  wake_up_worker(pool);
		  spin_unlock_irq(&pool->lock);
	  }
  }

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 29 insertions, 13 deletions

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 69bc4bf89e3e..4543b9aba40c 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -654,6 +654,24 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 	return 0;
 }
 
+static int __decode_pgid(void **p, void *end, struct ceph_pg *pg)
+{
+	u8 v;
+
+	ceph_decode_need(p, end, 1+8+4+4, bad);
+	v = ceph_decode_8(p);
+	if (v != 1)
+		goto bad;
+	pg->pool = ceph_decode_64(p);
+	pg->seed = ceph_decode_32(p);
+	*p += 4; /* skip preferred */
+	return 0;
+
+bad:
+	dout("error decoding pgid\n");
+	return -EINVAL;
+}
+
 /*
  * decode a full map.
  */
@@ -745,13 +763,12 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 	for (i = 0; i < len; i++) {
 		int n, j;
 		struct ceph_pg pgid;
-		struct ceph_pg_v1 pgid_v1;
 		struct ceph_pg_mapping *pg;
 
-		ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
-		ceph_decode_copy(p, &pgid_v1, sizeof(pgid_v1));
-		pgid.pool = le32_to_cpu(pgid_v1.pool);
-		pgid.seed = le16_to_cpu(pgid_v1.ps);
+		err = __decode_pgid(p, end, &pgid);
+		if (err)
+			goto bad;
+		ceph_decode_need(p, end, sizeof(u32), bad);
 		n = ceph_decode_32(p);
 		err = -EINVAL;
 		if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
@@ -818,8 +835,8 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	u16 version;
 
 	ceph_decode_16_safe(p, end, version, bad);
-	if (version > 6) {
-		pr_warning("got unknown v %d > %d of inc osdmap\n", version, 6);
+	if (version != 6) {
+		pr_warning("got unknown v %d != 6 of inc osdmap\n", version);
 		goto bad;
 	}
 
@@ -963,15 +980,14 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	while (len--) {
 		struct ceph_pg_mapping *pg;
 		int j;
-		struct ceph_pg_v1 pgid_v1;
 		struct ceph_pg pgid;
 		u32 pglen;
-		ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
-		ceph_decode_copy(p, &pgid_v1, sizeof(pgid_v1));
-		pgid.pool = le32_to_cpu(pgid_v1.pool);
-		pgid.seed = le16_to_cpu(pgid_v1.ps);
-		pglen = ceph_decode_32(p);
 
+		err = __decode_pgid(p, end, &pgid);
+		if (err)
+			goto bad;
+		ceph_decode_need(p, end, sizeof(u32), bad);
+		pglen = ceph_decode_32(p);
 		if (pglen) {
 			ceph_decode_need(p, end, pglen*sizeof(u32), bad);