Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block layer fixes from Jens Axboe:
 "Just a set of small fixes that have either been queued up after the
  original pull for this merge window, or just missed the original pull
  request.

   - a few bcache fixes/changes from Eric and Kent

   - add WRITE_SAME to the command filter whitelist frm Mauricio

   - kill an unused struct member from Ritesh

   - partition IO alignment fix from Stefan

   - nvme sysfs printf fix from Stephen"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: check partition alignment
  nvme : Use correct scnprintf in cmb show
  block: allow WRITE_SAME commands with the SG_IO ioctl
  block: Remove unused member (busy) from struct blk_queue_tag
  bcache: partition support: add 16 minors per bcacheN device
  bcache: Make gc wakeup sane, remove set_task_state()

9 files changed, 38 insertions, 30 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
index f856963204f4..656c8c6ed206 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -45,6 +45,9 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
                                     || pstart < 0 || plength < 0 || partno > 65535)
                                         return -EINVAL;
                         }
+                        /* check if partition is aligned to blocksize */
+                        if (p.start & (bdev_logical_block_size(bdev) - 1))
+                                return -EINVAL;
 
                         mutex_lock(&bdev->bd_mutex);
 
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 0774799942e0..c6fee7437be4 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -182,6 +182,9 @@ static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
         __set_bit(WRITE_16, filter->write_ok);
         __set_bit(WRITE_LONG, filter->write_ok);
         __set_bit(WRITE_LONG_2, filter->write_ok);
+        __set_bit(WRITE_SAME, filter->write_ok);
+        __set_bit(WRITE_SAME_16, filter->write_ok);
+        __set_bit(WRITE_SAME_32, filter->write_ok);
         __set_bit(ERASE, filter->write_ok);
         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
         __set_bit(MODE_SELECT, filter->write_ok);
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 6b420a55c745..c3ea03c9a1a8 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -425,7 +425,7 @@ struct cache {
          * until a gc finishes - otherwise we could pointlessly burn a ton of
          * cpu
          */
-        unsigned                invalidate_needs_gc:1;
+        unsigned                invalidate_needs_gc;
 
         bool                    discard; /* Get rid of? */
 
@@ -593,8 +593,8 @@ struct cache_set {
 
         /* Counts how many sectors bio_insert has added to the cache */
         atomic_t                sectors_to_gc;
+        wait_queue_head_t       gc_wait;
 
-        wait_queue_head_t       moving_gc_wait;
         struct keybuf           moving_gc_keys;
         /* Number of moving GC bios in flight */
         struct semaphore        moving_in_flight;
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 6fdd8e252760..a43eedd5804d 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1757,32 +1757,34 @@ static void bch_btree_gc(struct cache_set *c)
         bch_moving_gc(c);
 }
 
-static int bch_gc_thread(void *arg)
+static bool gc_should_run(struct cache_set *c)
 {
-        struct cache_set *c = arg;
         struct cache *ca;
         unsigned i;
 
-        while (1) {
-again:
-                bch_btree_gc(c);
+        for_each_cache(ca, c, i)
+                if (ca->invalidate_needs_gc)
+                        return true;
 
-                set_current_state(TASK_INTERRUPTIBLE);
-                if (kthread_should_stop())
-                        break;
+        if (atomic_read(&c->sectors_to_gc) < 0)
+                return true;
 
-                mutex_lock(&c->bucket_lock);
+        return false;
+}
 
-                for_each_cache(ca, c, i)
-                        if (ca->invalidate_needs_gc) {
-                                mutex_unlock(&c->bucket_lock);
-                                set_current_state(TASK_RUNNING);
-                                goto again;
-                        }
+static int bch_gc_thread(void *arg)
+{
+        struct cache_set *c = arg;
 
-                mutex_unlock(&c->bucket_lock);
+        while (1) {
+                wait_event_interruptible(c->gc_wait,
+                           kthread_should_stop() || gc_should_run(c));
 
-                schedule();
+                if (kthread_should_stop())
+                        break;
+
+                set_gc_sectors(c);
+                bch_btree_gc(c);
         }
 
         return 0;
@@ -1790,11 +1792,10 @@ again:
 
 int bch_gc_thread_start(struct cache_set *c)
 {
-        c->gc_thread = kthread_create(bch_gc_thread, c, "bcache_gc");
+        c->gc_thread = kthread_run(bch_gc_thread, c, "bcache_gc");
         if (IS_ERR(c->gc_thread))
                 return PTR_ERR(c->gc_thread);
 
-        set_task_state(c->gc_thread, TASK_INTERRUPTIBLE);
         return 0;
 }
 
diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h
index 5c391fa01bed..9b80417cd547 100644
--- a/drivers/md/bcache/btree.h
+++ b/drivers/md/bcache/btree.h
@@ -260,8 +260,7 @@ void bch_initial_mark_key(struct cache_set *, int, struct bkey *);
 
 static inline void wake_up_gc(struct cache_set *c)
 {
-        if (c->gc_thread)
-                wake_up_process(c->gc_thread);
+        wake_up(&c->gc_wait);
 }
 
 #define MAP_DONE        0
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index f49c5417527d..76d20875503c 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -196,10 +196,8 @@ static void bch_data_insert_start(struct closure *cl)
         struct data_insert_op *op = container_of(cl, struct data_insert_op, cl);
         struct bio *bio = op->bio, *n;
 
-        if (atomic_sub_return(bio_sectors(bio), &op->c->sectors_to_gc) < 0) {
-                set_gc_sectors(op->c);
+        if (atomic_sub_return(bio_sectors(bio), &op->c->sectors_to_gc) < 0)
                 wake_up_gc(op->c);
-        }
 
         if (op->bypass)
                 return bch_data_invalidate(cl);
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 2fb5bfeb43e2..3a19cbc8b230 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -58,6 +58,7 @@ static wait_queue_head_t unregister_wait;
 struct workqueue_struct *bcache_wq;
 
 #define BTREE_MAX_PAGES         (256 * 1024 / PAGE_SIZE)
+#define BCACHE_MINORS           16 /* partition support */
 
 /* Superblock */
 
@@ -783,8 +784,10 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
         if (minor < 0)
                 return minor;
 
+        minor *= BCACHE_MINORS;
+
         if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
-            !(d->disk = alloc_disk(1))) {
+            !(d->disk = alloc_disk(BCACHE_MINORS))) {
                 ida_simple_remove(&bcache_minor, minor);
                 return -ENOMEM;
         }
@@ -1489,6 +1492,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
         mutex_init(&c->bucket_lock);
         init_waitqueue_head(&c->btree_cache_wait);
         init_waitqueue_head(&c->bucket_wait);
+        init_waitqueue_head(&c->gc_wait);
         sema_init(&c->uuid_write_mutex, 1);
 
         spin_lock_init(&c->btree_gc_time.lock);
@@ -1548,6 +1552,7 @@ static void run_cache_set(struct cache_set *c)
 
         for_each_cache(ca, c, i)
                 c->nbuckets += ca->sb.nbuckets;
+        set_gc_sectors(c);
 
         if (CACHE_SYNC(&c->sb)) {
                 LIST_HEAD(journal);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 2fd7dc2e8fc4..3d21a154dce7 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -50,7 +50,7 @@
 #define NVME_AQ_DEPTH           256
 #define SQ_SIZE(depth)          (depth * sizeof(struct nvme_command))
 #define CQ_SIZE(depth)          (depth * sizeof(struct nvme_completion))
-                
+
 /*
  * We handle AEN commands ourselves and don't even let the
  * block layer know about them.
@@ -1349,7 +1349,7 @@ static ssize_t nvme_cmb_show(struct device *dev,
 {
         struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev));
 
-        return snprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
+        return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
                        ndev->cmbloc, ndev->cmbsz);
 }
 static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 286b2a264383..83695641bd5e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -288,7 +288,6 @@ enum blk_queue_state {
 struct blk_queue_tag {
         struct request **tag_index;     /* map of busy tags */
         unsigned long *tag_map;         /* bit map of free/busy tags */
-        int busy;                       /* current depth */
         int max_depth;                  /* what we will send to device */
         int real_max_depth;             /* what the array can hold */
         atomic_t refcnt;                /* map can be shared */