btrfs: migrate nocow and reservation helpers

These are relatively straightforward as well.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/block-group.c

@@ -2,6 +2,7 @@
 
 #include "ctree.h"
 #include "block-group.h"
+#include "space-info.h"
 
 void btrfs_get_block_group(struct btrfs_block_group_cache *cache)
 {
@@ -118,3 +119,84 @@ struct btrfs_block_group_cache *btrfs_next_block_group(
 	spin_unlock(&fs_info->block_group_cache_lock);
 	return cache;
 }
+
+bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+	struct btrfs_block_group_cache *bg;
+	bool ret = true;
+
+	bg = btrfs_lookup_block_group(fs_info, bytenr);
+	if (!bg)
+		return false;
+
+	spin_lock(&bg->lock);
+	if (bg->ro)
+		ret = false;
+	else
+		atomic_inc(&bg->nocow_writers);
+	spin_unlock(&bg->lock);
+
+	/* No put on block group, done by btrfs_dec_nocow_writers */
+	if (!ret)
+		btrfs_put_block_group(bg);
+
+	return ret;
+}
+
+void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+	struct btrfs_block_group_cache *bg;
+
+	bg = btrfs_lookup_block_group(fs_info, bytenr);
+	ASSERT(bg);
+	if (atomic_dec_and_test(&bg->nocow_writers))
+		wake_up_var(&bg->nocow_writers);
+	/*
+	 * Once for our lookup and once for the lookup done by a previous call
+	 * to btrfs_inc_nocow_writers()
+	 */
+	btrfs_put_block_group(bg);
+	btrfs_put_block_group(bg);
+}
+
+void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg)
+{
+	wait_var_event(&bg->nocow_writers, !atomic_read(&bg->nocow_writers));
+}
+
+void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
+					const u64 start)
+{
+	struct btrfs_block_group_cache *bg;
+
+	bg = btrfs_lookup_block_group(fs_info, start);
+	ASSERT(bg);
+	if (atomic_dec_and_test(&bg->reservations))
+		wake_up_var(&bg->reservations);
+	btrfs_put_block_group(bg);
+}
+
+void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg)
+{
+	struct btrfs_space_info *space_info = bg->space_info;
+
+	ASSERT(bg->ro);
+
+	if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA))
+		return;
+
+	/*
+	 * Our block group is read only but before we set it to read only,
+	 * some task might have had allocated an extent from it already, but it
+	 * has not yet created a respective ordered extent (and added it to a
+	 * root's list of ordered extents).
+	 * Therefore wait for any task currently allocating extents, since the
+	 * block group's reservations counter is incremented while a read lock
+	 * on the groups' semaphore is held and decremented after releasing
+	 * the read access on that semaphore and creating the ordered extent.
+	 */
+	down_write(&space_info->groups_sem);
+	up_write(&space_info->groups_sem);
+
+	wait_var_event(&bg->reservations, !atomic_read(&bg->reservations));
+}

fs/btrfs/block-group.h

@@ -159,5 +159,11 @@ struct btrfs_block_group_cache *btrfs_next_block_group(
 		struct btrfs_block_group_cache *cache);
 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
+void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
+					const u64 start);
+void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
+bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
+void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
+void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
 
 #endif /* BTRFS_BLOCK_GROUP_H */

fs/btrfs/ctree.h

@@ -2473,12 +2473,6 @@ static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
 	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
 }
 
-void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
-					 const u64 start);
-void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
-bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
-void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
-void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
 			   unsigned long count);
 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,

fs/btrfs/extent-tree.c

@@ -3561,51 +3561,6 @@ int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr)
 	return readonly;
 }
 
-bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
-{
-	struct btrfs_block_group_cache *bg;
-	bool ret = true;
-
-	bg = btrfs_lookup_block_group(fs_info, bytenr);
-	if (!bg)
-		return false;
-
-	spin_lock(&bg->lock);
-	if (bg->ro)
-		ret = false;
-	else
-		atomic_inc(&bg->nocow_writers);
-	spin_unlock(&bg->lock);
-
-	/* no put on block group, done by btrfs_dec_nocow_writers */
-	if (!ret)
-		btrfs_put_block_group(bg);
-
-	return ret;
-
-}
-
-void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
-{
-	struct btrfs_block_group_cache *bg;
-
-	bg = btrfs_lookup_block_group(fs_info, bytenr);
-	ASSERT(bg);
-	if (atomic_dec_and_test(&bg->nocow_writers))
-		wake_up_var(&bg->nocow_writers);
-	/*
-	 * Once for our lookup and once for the lookup done by a previous call
-	 * to btrfs_inc_nocow_writers()
-	 */
-	btrfs_put_block_group(bg);
-	btrfs_put_block_group(bg);
-}
-
-void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg)
-{
-	wait_var_event(&bg->nocow_writers, !atomic_read(&bg->nocow_writers));
-}
-
 static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
 {
 	u64 extra_flags = chunk_to_extended(flags) &
@@ -4277,43 +4232,6 @@ btrfs_inc_block_group_reservations(struct btrfs_block_group_cache *bg)
 	atomic_inc(&bg->reservations);
 }
 
-void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
-					const u64 start)
-{
-	struct btrfs_block_group_cache *bg;
-
-	bg = btrfs_lookup_block_group(fs_info, start);
-	ASSERT(bg);
-	if (atomic_dec_and_test(&bg->reservations))
-		wake_up_var(&bg->reservations);
-	btrfs_put_block_group(bg);
-}
-
-void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg)
-{
-	struct btrfs_space_info *space_info = bg->space_info;
-
-	ASSERT(bg->ro);
-
-	if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA))
-		return;
-
-	/*
-	 * Our block group is read only but before we set it to read only,
-	 * some task might have had allocated an extent from it already, but it
-	 * has not yet created a respective ordered extent (and added it to a
-	 * root's list of ordered extents).
-	 * Therefore wait for any task currently allocating extents, since the
-	 * block group's reservations counter is incremented while a read lock
-	 * on the groups' semaphore is held and decremented after releasing
-	 * the read access on that semaphore and creating the ordered extent.
-	 */
-	down_write(&space_info->groups_sem);
-	up_write(&space_info->groups_sem);
-
-	wait_var_event(&bg->reservations, !atomic_read(&bg->reservations));
-}
-
 /**
  * btrfs_add_reserved_bytes - update the block_group and space info counters
  * @cache:	The cache we are manipulating