Merge branch 'for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes and cleanups from Chris Mason:
 "Some of this got cherry-picked from a github repo this week, but I
  verified the patches.

  We have three small scrub cleanups and a collection of fixes"

* 'for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: Use fs_info directly in btrfs_delete_unused_bgs
  btrfs: Fix lost-data-profile caused by balance bg
  btrfs: Fix lost-data-profile caused by auto removing bg
  btrfs: Remove len argument from scrub_find_csum
  btrfs: Reduce unnecessary arguments in scrub_recheck_block
  btrfs: Use scrub_checksum_data and scrub_checksum_tree_block for scrub_recheck_block_checksum
  btrfs: Reset sblock->xxx_error stats before calling scrub_recheck_block_checksum
  btrfs: scrub: setup all fields for sblock_to_check
  btrfs: scrub: set error stats when tree block spanning stripes
  Btrfs: fix race when listing an inode's xattrs
  Btrfs: fix race leading to BUG_ON when running delalloc for nodatacow
  Btrfs: fix race leading to incorrect item deletion when dropping extents
  Btrfs: fix sleeping inside atomic context in qgroup rescan worker
  Btrfs: fix race waiting for qgroup rescan worker
  btrfs: qgroup: exit the rescan worker during umount
  Btrfs: fix extent accounting for partial direct IO writes

fs/btrfs/disk-io.c

@@ -3780,6 +3780,9 @@ void close_ctree(struct btrfs_root *root)
 	fs_info->closing = 1;
 	smp_mb();
 
+	/* wait for the qgroup rescan worker to stop */
+	btrfs_qgroup_wait_for_completion(fs_info);
+
 	/* wait for the uuid_scan task to finish */
 	down(&fs_info->uuid_tree_rescan_sem);
 	/* avoid complains from lockdep et al., set sem back to initial state */

fs/btrfs/extent-tree.c

@@ -10279,22 +10279,25 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
 		block_group = list_first_entry(&fs_info->unused_bgs,
 					       struct btrfs_block_group_cache,
 					       bg_list);
-		space_info = block_group->space_info;
 		list_del_init(&block_group->bg_list);
+
+		space_info = block_group->space_info;
+
 		if (ret || btrfs_mixed_space_info(space_info)) {
 			btrfs_put_block_group(block_group);
 			continue;
 		}
 		spin_unlock(&fs_info->unused_bgs_lock);
 
-		mutex_lock(&root->fs_info->delete_unused_bgs_mutex);
+		mutex_lock(&fs_info->delete_unused_bgs_mutex);
 
 		/* Don't want to race with allocators so take the groups_sem */
 		down_write(&space_info->groups_sem);
 		spin_lock(&block_group->lock);
 		if (block_group->reserved ||
 		    btrfs_block_group_used(&block_group->item) ||
-		    block_group->ro) {
+		    block_group->ro ||
+		    list_is_singular(&block_group->list)) {
 			/*
 			 * We want to bail if we made new allocations or have
 			 * outstanding allocations in this block group.  We do
@@ -10410,7 +10413,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
 end_trans:
 		btrfs_end_transaction(trans, root);
 next:
-		mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+		mutex_unlock(&fs_info->delete_unused_bgs_mutex);
 		btrfs_put_block_group(block_group);
 		spin_lock(&fs_info->unused_bgs_lock);
 	}

fs/btrfs/file.c

@@ -756,8 +756,16 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
 		}
 
 		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-		if (key.objectid > ino ||
-		    key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
+
+		if (key.objectid > ino)
+			break;
+		if (WARN_ON_ONCE(key.objectid < ino) ||
+		    key.type < BTRFS_EXTENT_DATA_KEY) {
+			ASSERT(del_nr == 0);
+			path->slots[0]++;
+			goto next_slot;
+		}
+		if (key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
 			break;
 
 		fi = btrfs_item_ptr(leaf, path->slots[0],
@@ -776,8 +784,8 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
 				btrfs_file_extent_inline_len(leaf,
 						     path->slots[0], fi);
 		} else {
-			WARN_ON(1);
-			extent_end = search_start;
+			/* can't happen */
+			BUG();
 		}
 
 		/*

fs/btrfs/inode.c

@@ -1304,8 +1304,14 @@ static noinline int run_delalloc_nocow(struct inode *inode,
 		num_bytes = 0;
 		btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 
-		if (found_key.objectid > ino ||
-		    found_key.type > BTRFS_EXTENT_DATA_KEY ||
+		if (found_key.objectid > ino)
+			break;
+		if (WARN_ON_ONCE(found_key.objectid < ino) ||
+		    found_key.type < BTRFS_EXTENT_DATA_KEY) {
+			path->slots[0]++;
+			goto next_slot;
+		}
+		if (found_key.type > BTRFS_EXTENT_DATA_KEY ||
 		    found_key.offset > end)
 			break;
 
@@ -7503,6 +7509,28 @@ struct btrfs_dio_data {
 	u64 reserve;
 };
 
+static void adjust_dio_outstanding_extents(struct inode *inode,
+					   struct btrfs_dio_data *dio_data,
+					   const u64 len)
+{
+	unsigned num_extents;
+
+	num_extents = (unsigned) div64_u64(len + BTRFS_MAX_EXTENT_SIZE - 1,
+					   BTRFS_MAX_EXTENT_SIZE);
+	/*
+	 * If we have an outstanding_extents count still set then we're
+	 * within our reservation, otherwise we need to adjust our inode
+	 * counter appropriately.
+	 */
+	if (dio_data->outstanding_extents) {
+		dio_data->outstanding_extents -= num_extents;
+	} else {
+		spin_lock(&BTRFS_I(inode)->lock);
+		BTRFS_I(inode)->outstanding_extents += num_extents;
+		spin_unlock(&BTRFS_I(inode)->lock);
+	}
+}
+
 static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
 				   struct buffer_head *bh_result, int create)
 {
@@ -7538,8 +7566,11 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
 	 * If this errors out it's because we couldn't invalidate pagecache for
 	 * this range and we need to fallback to buffered.
 	 */
-	if (lock_extent_direct(inode, lockstart, lockend, &cached_state, create))
-		return -ENOTBLK;
+	if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
+			       create)) {
+		ret = -ENOTBLK;
+		goto err;
+	}
 
 	em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
 	if (IS_ERR(em)) {
@@ -7657,19 +7688,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
 		if (start + len > i_size_read(inode))
 			i_size_write(inode, start + len);
 
-		/*
-		 * If we have an outstanding_extents count still set then we're
-		 * within our reservation, otherwise we need to adjust our inode
-		 * counter appropriately.
-		 */
-		if (dio_data->outstanding_extents) {
-			(dio_data->outstanding_extents)--;
-		} else {
-			spin_lock(&BTRFS_I(inode)->lock);
-			BTRFS_I(inode)->outstanding_extents++;
-			spin_unlock(&BTRFS_I(inode)->lock);
-		}
-
+		adjust_dio_outstanding_extents(inode, dio_data, len);
 		btrfs_free_reserved_data_space(inode, start, len);
 		WARN_ON(dio_data->reserve < len);
 		dio_data->reserve -= len;
@@ -7696,8 +7715,17 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
 unlock_err:
 	clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend,
 			 unlock_bits, 1, 0, &cached_state, GFP_NOFS);
+err:
 	if (dio_data)
 		current->journal_info = dio_data;
+	/*
+	 * Compensate the delalloc release we do in btrfs_direct_IO() when we
+	 * write less data then expected, so that we don't underflow our inode's
+	 * outstanding extents counter.
+	 */
+	if (create && dio_data)
+		adjust_dio_outstanding_extents(inode, dio_data, len);
+
 	return ret;
 }
 

fs/btrfs/qgroup.c

@@ -2198,7 +2198,6 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 	int slot;
 	int ret;
 
-	path->leave_spinning = 1;
 	mutex_lock(&fs_info->qgroup_rescan_lock);
 	ret = btrfs_search_slot_for_read(fs_info->extent_root,
 					 &fs_info->qgroup_rescan_progress,
@@ -2286,7 +2285,7 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
 		goto out;
 
 	err = 0;
-	while (!err) {
+	while (!err && !btrfs_fs_closing(fs_info)) {
 		trans = btrfs_start_transaction(fs_info->fs_root, 0);
 		if (IS_ERR(trans)) {
 			err = PTR_ERR(trans);
@@ -2307,7 +2306,8 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
 	btrfs_free_path(path);
 
 	mutex_lock(&fs_info->qgroup_rescan_lock);
-	fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
+	if (!btrfs_fs_closing(fs_info))
+		fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
 
 	if (err > 0 &&
 	    fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
@@ -2336,7 +2336,9 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
 	}
 	btrfs_end_transaction(trans, fs_info->quota_root);
 
-	if (err >= 0) {
+	if (btrfs_fs_closing(fs_info)) {
+		btrfs_info(fs_info, "qgroup scan paused");
+	} else if (err >= 0) {
 		btrfs_info(fs_info, "qgroup scan completed%s",
 			err > 0 ? " (inconsistency flag cleared)" : "");
 	} else {
@@ -2384,12 +2386,11 @@ qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
 	memset(&fs_info->qgroup_rescan_progress, 0,
 		sizeof(fs_info->qgroup_rescan_progress));
 	fs_info->qgroup_rescan_progress.objectid = progress_objectid;
+	init_completion(&fs_info->qgroup_rescan_completion);
 
 	spin_unlock(&fs_info->qgroup_lock);
 	mutex_unlock(&fs_info->qgroup_rescan_lock);
 
-	init_completion(&fs_info->qgroup_rescan_completion);
-
 	memset(&fs_info->qgroup_rescan_work, 0,
 	       sizeof(fs_info->qgroup_rescan_work));
 	btrfs_init_work(&fs_info->qgroup_rescan_work,

fs/btrfs/volumes.c

@@ -3400,6 +3400,7 @@ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
 	u32 count_data = 0;
 	u32 count_meta = 0;
 	u32 count_sys = 0;
+	int chunk_reserved = 0;
 
 	/* step one make some room on all the devices */
 	devices = &fs_info->fs_devices->devices;
@@ -3501,6 +3502,7 @@ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
 
 		ret = should_balance_chunk(chunk_root, leaf, chunk,
 					   found_key.offset);
+
 		btrfs_release_path(path);
 		if (!ret) {
 			mutex_unlock(&fs_info->delete_unused_bgs_mutex);
@@ -3537,6 +3539,25 @@ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
 			goto loop;
 		}
 
+		if ((chunk_type & BTRFS_BLOCK_GROUP_DATA) && !chunk_reserved) {
+			trans = btrfs_start_transaction(chunk_root, 0);
+			if (IS_ERR(trans)) {
+				mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+				ret = PTR_ERR(trans);
+				goto error;
+			}
+
+			ret = btrfs_force_chunk_alloc(trans, chunk_root,
+						      BTRFS_BLOCK_GROUP_DATA);
+			if (ret < 0) {
+				mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+				goto error;
+			}
+
+			btrfs_end_transaction(trans, chunk_root);
+			chunk_reserved = 1;
+		}
+
 		ret = btrfs_relocate_chunk(chunk_root,
 					   found_key.offset);
 		mutex_unlock(&fs_info->delete_unused_bgs_mutex);

fs/btrfs/xattr.c

@@ -313,8 +313,10 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 		/* check to make sure this item is what we want */
 		if (found_key.objectid != key.objectid)
 			break;
-		if (found_key.type != BTRFS_XATTR_ITEM_KEY)
+		if (found_key.type > BTRFS_XATTR_ITEM_KEY)
 			break;
+		if (found_key.type < BTRFS_XATTR_ITEM_KEY)
+			goto next;
 
 		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
 		if (verify_dir_item(root, leaf, di))