Merge branch 'for-chris' of git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next

16 files changed, 181 insertions, 174 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b4fb41558111..290e347b6db3 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -918,7 +918,8 @@ again:
 							   ref->parent, bsz, 0);
 				if (!eb || !extent_buffer_uptodate(eb)) {
 					free_extent_buffer(eb);
-					return -EIO;
+					ret = -EIO;
+					goto out;
 				}
 				ret = find_extent_in_eb(eb, bytenr,
 							*extent_item_pos, &eie);
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index de6de8e60b46..02fae7f7e42c 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -951,10 +951,12 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
 			BUG_ON(ret); /* -ENOMEM */
 		}
 		if (new_flags != 0) {
+			int level = btrfs_header_level(buf);
+
 			ret = btrfs_set_disk_extent_flags(trans, root,
 							  buf->start,
 							  buf->len,
-							  new_flags, 0);
+							  new_flags, level, 0);
 			if (ret)
 				return ret;
 		}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 63c328a9ce95..d6dd49b51ba8 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -88,12 +88,12 @@ struct btrfs_ordered_sum;
 /* holds checksums of all the data extents */
 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
 
-/* for storing balance parameters in the root tree */
-#define BTRFS_BALANCE_OBJECTID -4ULL
-
 /* holds quota configuration and tracking */
 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
 
+/* for storing balance parameters in the root tree */
+#define BTRFS_BALANCE_OBJECTID -4ULL
+
 /* orhpan objectid for tracking unlinked/truncated files */
 #define BTRFS_ORPHAN_OBJECTID -5ULL
 
@@ -3075,7 +3075,7 @@ int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
 				struct btrfs_root *root,
 				u64 bytenr, u64 num_bytes, u64 flags,
-				int is_data);
+				int level, int is_data);
 int btrfs_free_extent(struct btrfs_trans_handle *trans,
 		      struct btrfs_root *root,
 		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index f75fcaf79aeb..70b962cc177d 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -60,6 +60,7 @@ struct btrfs_delayed_ref_node {
 struct btrfs_delayed_extent_op {
 	struct btrfs_disk_key key;
 	u64 flags_to_set;
+	int level;
 	unsigned int update_key:1;
 	unsigned int update_flags:1;
 	unsigned int is_data:1;
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 7ba7b3900cb8..65241f32d3f8 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -313,6 +313,11 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
 	struct btrfs_device *tgt_device = NULL;
 	struct btrfs_device *src_device = NULL;
 
+	if (btrfs_fs_incompat(fs_info, RAID56)) {
+		pr_warn("btrfs: dev_replace cannot yet handle RAID5/RAID6\n");
+		return -EINVAL;
+	}
+
 	switch (args->start.cont_reading_from_srcdev_mode) {
 	case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
 	case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ca0ea9928210..e7b3cb5286a5 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -152,7 +152,7 @@ static struct btrfs_lockdep_keyset {
 	{ .id = BTRFS_DEV_TREE_OBJECTID,	.name_stem = "dev"	},
 	{ .id = BTRFS_FS_TREE_OBJECTID,		.name_stem = "fs"	},
 	{ .id = BTRFS_CSUM_TREE_OBJECTID,	.name_stem = "csum"	},
-	{ .id = BTRFS_ORPHAN_OBJECTID,		.name_stem = "orphan"	},
+	{ .id = BTRFS_QUOTA_TREE_OBJECTID,	.name_stem = "quota"	},
 	{ .id = BTRFS_TREE_LOG_OBJECTID,	.name_stem = "log"	},
 	{ .id = BTRFS_TREE_RELOC_OBJECTID,	.name_stem = "treloc"	},
 	{ .id = BTRFS_DATA_RELOC_TREE_OBJECTID,	.name_stem = "dreloc"	},
@@ -1513,7 +1513,6 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
 	}
 
 	root->commit_root = btrfs_root_node(root);
-	BUG_ON(!root->node); /* -ENOMEM */
 out:
 	if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
 		root->ref_cows = 1;
@@ -1988,30 +1987,33 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
 {
 	free_extent_buffer(info->tree_root->node);
 	free_extent_buffer(info->tree_root->commit_root);
-	free_extent_buffer(info->dev_root->node);
-	free_extent_buffer(info->dev_root->commit_root);
-	free_extent_buffer(info->extent_root->node);
-	free_extent_buffer(info->extent_root->commit_root);
-	free_extent_buffer(info->csum_root->node);
-	free_extent_buffer(info->csum_root->commit_root);
-	if (info->quota_root) {
-		free_extent_buffer(info->quota_root->node);
-		free_extent_buffer(info->quota_root->commit_root);
-	}
-
 	info->tree_root->node = NULL;
 	info->tree_root->commit_root = NULL;
-	info->dev_root->node = NULL;
-	info->dev_root->commit_root = NULL;
-	info->extent_root->node = NULL;
-	info->extent_root->commit_root = NULL;
-	info->csum_root->node = NULL;
-	info->csum_root->commit_root = NULL;
+
+	if (info->dev_root) {
+		free_extent_buffer(info->dev_root->node);
+		free_extent_buffer(info->dev_root->commit_root);
+		info->dev_root->node = NULL;
+		info->dev_root->commit_root = NULL;
+	}
+	if (info->extent_root) {
+		free_extent_buffer(info->extent_root->node);
+		free_extent_buffer(info->extent_root->commit_root);
+		info->extent_root->node = NULL;
+		info->extent_root->commit_root = NULL;
+	}
+	if (info->csum_root) {
+		free_extent_buffer(info->csum_root->node);
+		free_extent_buffer(info->csum_root->commit_root);
+		info->csum_root->node = NULL;
+		info->csum_root->commit_root = NULL;
+	}
 	if (info->quota_root) {
+		free_extent_buffer(info->quota_root->node);
+		free_extent_buffer(info->quota_root->commit_root);
 		info->quota_root->node = NULL;
 		info->quota_root->commit_root = NULL;
 	}
-
 	if (chunk_root) {
 		free_extent_buffer(info->chunk_root->node);
 		free_extent_buffer(info->chunk_root->commit_root);
@@ -3659,8 +3661,11 @@ static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
 					 ordered_operations);
 
 		list_del_init(&btrfs_inode->ordered_operations);
+		spin_unlock(&root->fs_info->ordered_extent_lock);
 
 		btrfs_invalidate_inodes(btrfs_inode->root);
+
+		spin_lock(&root->fs_info->ordered_extent_lock);
 	}
 
 	spin_unlock(&root->fs_info->ordered_extent_lock);
@@ -3782,8 +3787,11 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
 		list_del_init(&btrfs_inode->delalloc_inodes);
 		clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
 			  &btrfs_inode->runtime_flags);
+		spin_unlock(&root->fs_info->delalloc_lock);
 
 		btrfs_invalidate_inodes(btrfs_inode->root);
+
+		spin_lock(&root->fs_info->delalloc_lock);
 	}
 
 	spin_unlock(&root->fs_info->delalloc_lock);
@@ -3808,7 +3816,7 @@ static int btrfs_destroy_marked_extents(struct btrfs_root *root,
 		while (start <= end) {
 			eb = btrfs_find_tree_block(root, start,
 						   root->leafsize);
-			start += eb->len;
+			start += root->leafsize;
 			if (!eb)
 				continue;
 			wait_on_extent_buffer_writeback(eb);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2305b5c5cf00..df472ab1b5ac 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2070,8 +2070,7 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
 	u32 item_size;
 	int ret;
 	int err = 0;
-	int metadata = (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
-			node->type == BTRFS_SHARED_BLOCK_REF_KEY);
+	int metadata = !extent_op->is_data;
 
 	if (trans->aborted)
 		return 0;
@@ -2086,11 +2085,8 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
 	key.objectid = node->bytenr;
 
 	if (metadata) {
-		struct btrfs_delayed_tree_ref *tree_ref;
-
-		tree_ref = btrfs_delayed_node_to_tree_ref(node);
 		key.type = BTRFS_METADATA_ITEM_KEY;
-		key.offset = tree_ref->level;
+		key.offset = extent_op->level;
 	} else {
 		key.type = BTRFS_EXTENT_ITEM_KEY;
 		key.offset = node->num_bytes;
@@ -2719,7 +2715,7 @@ out:
 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
 				struct btrfs_root *root,
 				u64 bytenr, u64 num_bytes, u64 flags,
-				int is_data)
+				int level, int is_data)
 {
 	struct btrfs_delayed_extent_op *extent_op;
 	int ret;
@@ -2732,6 +2728,7 @@ int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
 	extent_op->update_flags = 1;
 	extent_op->update_key = 0;
 	extent_op->is_data = is_data ? 1 : 0;
+	extent_op->level = level;
 
 	ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr,
 					  num_bytes, extent_op);
@@ -3109,6 +3106,11 @@ again:
 	WARN_ON(ret);
 
 	if (i_size_read(inode) > 0) {
+		ret = btrfs_check_trunc_cache_free_space(root,
+					&root->fs_info->global_block_rsv);
+		if (ret)
+			goto out_put;
+
 		ret = btrfs_truncate_free_space_cache(root, trans, path,
 						      inode);
 		if (ret)
@@ -4562,6 +4564,8 @@ static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
 	fs_info->csum_root->block_rsv = &fs_info->global_block_rsv;
 	fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
 	fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
+	if (fs_info->quota_root)
+		fs_info->quota_root->block_rsv = &fs_info->global_block_rsv;
 	fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
 
 	update_global_block_rsv(fs_info);
@@ -6651,51 +6655,51 @@ use_block_rsv(struct btrfs_trans_handle *trans,
 	struct btrfs_block_rsv *block_rsv;
 	struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv;
 	int ret;
+	bool global_updated = false;
 
 	block_rsv = get_block_rsv(trans, root);
 
-	if (block_rsv->size == 0) {
-		ret = reserve_metadata_bytes(root, block_rsv, blocksize,
-					     BTRFS_RESERVE_NO_FLUSH);
-		/*
-		 * If we couldn't reserve metadata bytes try and use some from
-		 * the global reserve.
-		 */
-		if (ret && block_rsv != global_rsv) {
-			ret = block_rsv_use_bytes(global_rsv, blocksize);
-			if (!ret)
-				return global_rsv;
-			return ERR_PTR(ret);
-		} else if (ret) {
-			return ERR_PTR(ret);
-		}
+	if (unlikely(block_rsv->size == 0))
+		goto try_reserve;
+again:
+	ret = block_rsv_use_bytes(block_rsv, blocksize);
+	if (!ret)
 		return block_rsv;
+
+	if (block_rsv->failfast)
+		return ERR_PTR(ret);
+
+	if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {
+		global_updated = true;
+		update_global_block_rsv(root->fs_info);
+		goto again;
 	}
 
-	ret = block_rsv_use_bytes(block_rsv, blocksize);
+	if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
+		static DEFINE_RATELIMIT_STATE(_rs,
+				DEFAULT_RATELIMIT_INTERVAL * 10,
+				/*DEFAULT_RATELIMIT_BURST*/ 1);
+		if (__ratelimit(&_rs))
+			WARN(1, KERN_DEBUG
+				"btrfs: block rsv returned %d\n", ret);
+	}
+try_reserve:
+	ret = reserve_metadata_bytes(root, block_rsv, blocksize,
+				     BTRFS_RESERVE_NO_FLUSH);
 	if (!ret)
 		return block_rsv;
-	if (ret && !block_rsv->failfast) {
-		if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
-			static DEFINE_RATELIMIT_STATE(_rs,
-					DEFAULT_RATELIMIT_INTERVAL * 10,
-					/*DEFAULT_RATELIMIT_BURST*/ 1);
-			if (__ratelimit(&_rs))
-				WARN(1, KERN_DEBUG
-					"btrfs: block rsv returned %d\n", ret);
-		}
-		ret = reserve_metadata_bytes(root, block_rsv, blocksize,
-					     BTRFS_RESERVE_NO_FLUSH);
-		if (!ret) {
-			return block_rsv;
-		} else if (ret && block_rsv != global_rsv) {
-			ret = block_rsv_use_bytes(global_rsv, blocksize);
-			if (!ret)
-				return global_rsv;
-		}
+	/*
+	 * If we couldn't reserve metadata bytes try and use some from
+	 * the global reserve if its space type is the same as the global
+	 * reservation.
+	 */
+	if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&
+	    block_rsv->space_info == global_rsv->space_info) {
+		ret = block_rsv_use_bytes(global_rsv, blocksize);
+		if (!ret)
+			return global_rsv;
 	}
-
-	return ERR_PTR(-ENOSPC);
+	return ERR_PTR(ret);
 }
 
 static void unuse_block_rsv(struct btrfs_fs_info *fs_info,
@@ -6763,6 +6767,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 			extent_op->update_key = 1;
 		extent_op->update_flags = 1;
 		extent_op->is_data = 0;
+		extent_op->level = level;
 
 		ret = btrfs_add_delayed_tree_ref(root->fs_info, trans,
 					ins.objectid,
@@ -6934,7 +6939,8 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 		ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc);
 		BUG_ON(ret); /* -ENOMEM */
 		ret = btrfs_set_disk_extent_flags(trans, root, eb->start,
-						  eb->len, flag, 0);
+						  eb->len, flag,
+						  btrfs_header_level(eb), 0);
 		BUG_ON(ret); /* -ENOMEM */
 		wc->flags[level] |= flag;
 	}
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fe1d6c3424a5..b306b3a88fc7 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1961,28 +1961,6 @@ static void check_page_uptodate(struct extent_io_tree *tree, struct page *page)
 }
 
 /*
- * helper function to unlock a page if all the extents in the tree
- * for that page are unlocked
- */
-static void check_page_locked(struct extent_io_tree *tree, struct page *page)
-{
-	u64 start = page_offset(page);
-	u64 end = start + PAGE_CACHE_SIZE - 1;
-	if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL))
-		unlock_page(page);
-}
-
-/*
- * helper function to end page writeback if all the extents
- * in the tree for that page are done with writeback
- */
-static void check_page_writeback(struct extent_io_tree *tree,
-				 struct page *page)
-{
-	end_page_writeback(page);
-}
-
-/*
  * When IO fails, either with EIO or csum verification fails, we
  * try other mirrors that might have a good copy of the data.  This
  * io_failure_record is used to record state as we go through all the
@@ -2411,19 +2389,24 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
 	struct extent_io_tree *tree;
 	u64 start;
 	u64 end;
-	int whole_page;
 
 	do {
 		struct page *page = bvec->bv_page;
 		tree = &BTRFS_I(page->mapping->host)->io_tree;
 
-		start = page_offset(page) + bvec->bv_offset;
-		end = start + bvec->bv_len - 1;
+		/* We always issue full-page reads, but if some block
+		 * in a page fails to read, blk_update_request() will
+		 * advance bv_offset and adjust bv_len to compensate.
+		 * Print a warning for nonzero offsets, and an error
+		 * if they don't add up to a full page.  */
+		if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE)
+			printk("%s page write in btrfs with offset %u and length %u\n",
+			       bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE
+			       ? KERN_ERR "partial" : KERN_INFO "incomplete",
+			       bvec->bv_offset, bvec->bv_len);
 
-		if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE)
-			whole_page = 1;
-		else
-			whole_page = 0;
+		start = page_offset(page);
+		end = start + bvec->bv_offset + bvec->bv_len - 1;
 
 		if (--bvec >= bio->bi_io_vec)
 			prefetchw(&bvec->bv_page->flags);
@@ -2431,10 +2414,7 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
 		if (end_extent_writepage(page, err, start, end))
 			continue;
 
-		if (whole_page)
-			end_page_writeback(page);
-		else
-			check_page_writeback(tree, page);
+		end_page_writeback(page);
 	} while (bvec >= bio->bi_io_vec);
 
 	bio_put(bio);
@@ -2459,7 +2439,6 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
 	struct extent_io_tree *tree;
 	u64 start;
 	u64 end;
-	int whole_page;
 	int mirror;
 	int ret;
 
@@ -2477,13 +2456,19 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
 			 io_bio->mirror_num);
 		tree = &BTRFS_I(page->mapping->host)->io_tree;
 
-		start = page_offset(page) + bvec->bv_offset;
-		end = start + bvec->bv_len - 1;
+		/* We always issue full-page reads, but if some block
+		 * in a page fails to read, blk_update_request() will
+		 * advance bv_offset and adjust bv_len to compensate.
+		 * Print a warning for nonzero offsets, and an error
+		 * if they don't add up to a full page.  */
+		if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE)
+			printk("%s page read in btrfs with offset %u and length %u\n",
+			       bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE
+			       ? KERN_ERR "partial" : KERN_INFO "incomplete",
+			       bvec->bv_offset, bvec->bv_len);
 
-		if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE)
-			whole_page = 1;
-		else
-			whole_page = 0;
+		start = page_offset(page);
+		end = start + bvec->bv_offset + bvec->bv_len - 1;
 
 		if (++bvec <= bvec_end)
 			prefetchw(&bvec->bv_page->flags);
@@ -2542,23 +2527,13 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
 		}
 		unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
 
-		if (whole_page) {
-			if (uptodate) {
-				SetPageUptodate(page);
-			} else {
-				ClearPageUptodate(page);
-				SetPageError(page);
-			}
-			unlock_page(page);
+		if (uptodate) {
+			SetPageUptodate(page);
 		} else {
-			if (uptodate) {
-				check_page_uptodate(tree, page);
-			} else {
-				ClearPageUptodate(page);
-				SetPageError(page);
-			}
-			check_page_locked(tree, page);
+			ClearPageUptodate(page);
+			SetPageError(page);
 		}
+		unlock_page(page);
 	} while (bvec <= bvec_end);
 
 	bio_put(bio);
@@ -4022,7 +3997,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		last_for_get_extent = isize;
 	}
 
-	lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
+	lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0,
 			 &cached_state);
 
 	em = get_extent_skip_holes(inode, start, last_for_get_extent,
@@ -4109,7 +4084,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 out_free:
 	free_extent_map(em);
 out:
-	unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len,
+	unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1,
 			     &cached_state, GFP_NOFS);
 	return ret;
 }
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index ecca6c7375a6..e53009657f0e 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -197,30 +197,32 @@ int create_free_space_inode(struct btrfs_root *root,
 					 block_group->key.objectid);
 }
 
-int btrfs_truncate_free_space_cache(struct btrfs_root *root,
-				    struct btrfs_trans_handle *trans,
-				    struct btrfs_path *path,
-				    struct inode *inode)
+int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
+				       struct btrfs_block_rsv *rsv)
 {
-	struct btrfs_block_rsv *rsv;
 	u64 needed_bytes;
-	loff_t oldsize;
-	int ret = 0;
-
-	rsv = trans->block_rsv;
-	trans->block_rsv = &root->fs_info->global_block_rsv;
+	int ret;
 
 	/* 1 for slack space, 1 for updating the inode */
 	needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) +
 		btrfs_calc_trans_metadata_size(root, 1);
 
-	spin_lock(&trans->block_rsv->lock);
-	if (trans->block_rsv->reserved < needed_bytes) {
-		spin_unlock(&trans->block_rsv->lock);
-		trans->block_rsv = rsv;
-		return -ENOSPC;
-	}
-	spin_unlock(&trans->block_rsv->lock);
+	spin_lock(&rsv->lock);
+	if (rsv->reserved < needed_bytes)
+		ret = -ENOSPC;
+	else
+		ret = 0;
+	spin_unlock(&rsv->lock);
+	return 0;
+}
+
+int btrfs_truncate_free_space_cache(struct btrfs_root *root,
+				    struct btrfs_trans_handle *trans,
+				    struct btrfs_path *path,
+				    struct inode *inode)
+{
+	loff_t oldsize;
+	int ret = 0;
 
 	oldsize = i_size_read(inode);
 	btrfs_i_size_write(inode, 0);
@@ -232,9 +234,7 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
 	 */
 	ret = btrfs_truncate_inode_items(trans, root, inode,
 					 0, BTRFS_EXTENT_DATA_KEY);
-
 	if (ret) {
-		trans->block_rsv = rsv;
 		btrfs_abort_transaction(trans, root, ret);
 		return ret;
 	}
@@ -242,7 +242,6 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
 	ret = btrfs_update_inode(trans, root, inode);
 	if (ret)
 		btrfs_abort_transaction(trans, root, ret);
-	trans->block_rsv = rsv;
 
 	return ret;
 }
@@ -920,10 +919,8 @@ static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
 
 	/* Make sure we can fit our crcs into the first page */
 	if (io_ctl.check_crcs &&
-	    (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) {
-		WARN_ON(1);
+	    (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE)
 		goto out_nospc;
-	}
 
 	io_ctl_set_generation(&io_ctl, trans->transid);
 
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index 4dc17d8809c7..8b7f19f44961 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -54,6 +54,8 @@ int create_free_space_inode(struct btrfs_root *root,
 			    struct btrfs_block_group_cache *block_group,
 			    struct btrfs_path *path);
 
+int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
+				       struct btrfs_block_rsv *rsv);
 int btrfs_truncate_free_space_cache(struct btrfs_root *root,
 				    struct btrfs_trans_handle *trans,
 				    struct btrfs_path *path,
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index d26f67a59e36..2c66ddbbe670 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -429,11 +429,12 @@ int btrfs_save_ino_cache(struct btrfs_root *root,
 	num_bytes = trans->bytes_reserved;
 	/*
 	 * 1 item for inode item insertion if need
-	 * 3 items for inode item update (in the worst case)
+	 * 4 items for inode item update (in the worst case)
+	 * 1 items for slack space if we need do truncation
 	 * 1 item for free space object
 	 * 3 items for pre-allocation
 	 */
-	trans->bytes_reserved = btrfs_calc_trans_metadata_size(root, 8);
+	trans->bytes_reserved = btrfs_calc_trans_metadata_size(root, 10);
 	ret = btrfs_block_rsv_add(root, trans->block_rsv,
 				  trans->bytes_reserved,
 				  BTRFS_RESERVE_NO_FLUSH);
@@ -468,7 +469,8 @@ again:
 	if (i_size_read(inode) > 0) {
 		ret = btrfs_truncate_free_space_cache(root, trans, path, inode);
 		if (ret) {
-			btrfs_abort_transaction(trans, root, ret);
+			if (ret != -ENOSPC)
+				btrfs_abort_transaction(trans, root, ret);
 			goto out_put;
 		}
 	}
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d59dddfb1f96..23c596cd1b98 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -714,8 +714,10 @@ retry:
 					async_extent->ram_size - 1, 0);
 
 		em = alloc_extent_map();
-		if (!em)
+		if (!em) {
+			ret = -ENOMEM;
 			goto out_free_reserve;
+		}
 		em->start = async_extent->start;
 		em->len = async_extent->ram_size;
 		em->orig_start = em->start;
@@ -922,8 +924,10 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
 		}
 
 		em = alloc_extent_map();
-		if (!em)
+		if (!em) {
+			ret = -ENOMEM;
 			goto out_reserve;
+		}
 		em->start = start;
 		em->orig_start = em->start;
 		ram_size = ins.offset;
@@ -4723,6 +4727,7 @@ void btrfs_evict_inode(struct inode *inode)
 	btrfs_end_transaction(trans, root);
 	btrfs_btree_balance_dirty(root);
 no_delete:
+	btrfs_remove_delayed_node(inode);
 	clear_inode(inode);
 	return;
 }
@@ -4838,14 +4843,13 @@ static void inode_tree_add(struct inode *inode)
 	struct rb_node **p;
 	struct rb_node *parent;
 	u64 ino = btrfs_ino(inode);
-again:
-	p = &root->inode_tree.rb_node;
-	parent = NULL;
 
 	if (inode_unhashed(inode))
 		return;
-
+again:
+	parent = NULL;
 	spin_lock(&root->inode_lock);
+	p = &root->inode_tree.rb_node;
 	while (*p) {
 		parent = *p;
 		entry = rb_entry(parent, struct btrfs_inode, rb_node);
@@ -8000,7 +8004,6 @@ void btrfs_destroy_inode(struct inode *inode)
 	inode_tree_del(inode);
 	btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
 free:
-	btrfs_remove_delayed_node(inode);
 	call_rcu(&inode->i_rcu, btrfs_i_callback);
 }
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0de4a2fcfb24..0f81d67cdc8d 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1801,7 +1801,11 @@ static noinline int copy_to_sk(struct btrfs_root *root,
 		item_off = btrfs_item_ptr_offset(leaf, i);
 		item_len = btrfs_item_size_nr(leaf, i);
 
-		if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
+		btrfs_item_key_to_cpu(leaf, key, i);
+		if (!key_in_sk(key, sk))
+			continue;
+
+		if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
 			item_len = 0;
 
 		if (sizeof(sh) + item_len + *sk_offset >
@@ -1810,10 +1814,6 @@ static noinline int copy_to_sk(struct btrfs_root *root,
 			goto overflow;
 		}
 
-		btrfs_item_key_to_cpu(leaf, key, i);
-		if (!key_in_sk(key, sk))
-			continue;
-
 		sh.objectid = key->objectid;
 		sh.offset = key->offset;
 		sh.type = key->type;
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 704a1b8d2a2b..395b82031a42 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1773,7 +1773,7 @@ again:
 			if (!eb || !extent_buffer_uptodate(eb)) {
 				ret = (!eb) ? -ENOMEM : -EIO;
 				free_extent_buffer(eb);
-				return ret;
+				break;
 			}
 			btrfs_tree_lock(eb);
 			if (cow) {
@@ -3350,6 +3350,11 @@ static int delete_block_group_cache(struct btrfs_fs_info *fs_info,
 	}
 
 truncate:
+	ret = btrfs_check_trunc_cache_free_space(root,
+						 &fs_info->global_block_rsv);
+	if (ret)
+		goto out;
+
 	path = btrfs_alloc_path();
 	if (!path) {
 		ret = -ENOMEM;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a4807ced23cc..f0857e092a3c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1263,6 +1263,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 
 		btrfs_dev_replace_suspend_for_unmount(fs_info);
 		btrfs_scrub_cancel(fs_info);
+		btrfs_pause_balance(fs_info);
 
 		ret = btrfs_commit_super(root);
 		if (ret)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 317afc7a2af4..24940085cdac 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3120,14 +3120,13 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
 	allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 	if (num_devices == 1)
 		allowed |= BTRFS_BLOCK_GROUP_DUP;
-	else if (num_devices < 4)
+	else if (num_devices > 1)
 		allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
-	else
-		allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
-				BTRFS_BLOCK_GROUP_RAID10 |
-				BTRFS_BLOCK_GROUP_RAID5 |
-				BTRFS_BLOCK_GROUP_RAID6);
-
+	if (num_devices > 2)
+		allowed |= BTRFS_BLOCK_GROUP_RAID5;
+	if (num_devices > 3)
+		allowed |= (BTRFS_BLOCK_GROUP_RAID10 |
+			    BTRFS_BLOCK_GROUP_RAID6);
 	if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
 	    (!alloc_profile_is_valid(bctl->data.target, 1) ||
 	     (bctl->data.target & ~allowed))) {