for-5.4-rc1-tag

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Merge tag 'for-5.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "A bunch of fixes that accumulated in recent weeks, mostly material for
  stable.

  Summary:

   - fix for regression from 5.3 that prevents to use balance convert
     with single profile

   - qgroup fixes: rescan race, accounting leak with multiple writers,
     potential leak after io failure recovery

   - fix for use after free in relocation (reported by KASAN)

   - other error handling fixups"

* tag 'for-5.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: qgroup: Fix reserved data space leak if we have multiple reserve calls
  btrfs: qgroup: Fix the wrong target io_tree when freeing reserved data space
  btrfs: Fix a regression which we can't convert to SINGLE profile
  btrfs: relocation: fix use-after-free on dead relocation roots
  Btrfs: fix race setting up and completing qgroup rescan workers
  Btrfs: fix missing error return if writeback for extent buffer never started
  btrfs: adjust dirty_metadata_bytes after writeback failure of extent buffer
  Btrfs: fix selftests failure due to uninitialized i_mode in test inodes

fs/btrfs/extent_io.c

@@ -3745,11 +3745,20 @@ err_unlock:
 static void set_btree_ioerr(struct page *page)
 {
 	struct extent_buffer *eb = (struct extent_buffer *)page->private;
+	struct btrfs_fs_info *fs_info;
 
 	SetPageError(page);
 	if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags))
 		return;
 
+	/*
+	 * If we error out, we should add back the dirty_metadata_bytes
+	 * to make it consistent.
+	 */
+	fs_info = eb->fs_info;
+	percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
+				 eb->len, fs_info->dirty_metadata_batch);
+
 	/*
 	 * If writeback for a btree extent that doesn't belong to a log tree
 	 * failed, increment the counter transaction->eb_write_errors.
@@ -3986,6 +3995,10 @@ retry:
 			if (!ret) {
 				free_extent_buffer(eb);
 				continue;
+			} else if (ret < 0) {
+				done = 1;
+				free_extent_buffer(eb);
+				break;
 			}
 
 			ret = write_one_eb(eb, wbc, &epd);

fs/btrfs/qgroup.c

@@ -3166,9 +3166,6 @@ out:
 	btrfs_free_path(path);
 
 	mutex_lock(&fs_info->qgroup_rescan_lock);
-	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) {
 		fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
@@ -3184,16 +3181,30 @@ out:
 	trans = btrfs_start_transaction(fs_info->quota_root, 1);
 	if (IS_ERR(trans)) {
 		err = PTR_ERR(trans);
+		trans = NULL;
 		btrfs_err(fs_info,
 			  "fail to start transaction for status update: %d",
 			  err);
-		goto done;
 	}
+
+	mutex_lock(&fs_info->qgroup_rescan_lock);
+	if (!btrfs_fs_closing(fs_info))
+		fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
+	if (trans) {
 		ret = update_qgroup_status_item(trans);
 		if (ret < 0) {
 			err = ret;
-		btrfs_err(fs_info, "fail to update qgroup status: %d", err);
+			btrfs_err(fs_info, "fail to update qgroup status: %d",
+				  err);
 		}
+	}
+	fs_info->qgroup_rescan_running = false;
+	complete_all(&fs_info->qgroup_rescan_completion);
+	mutex_unlock(&fs_info->qgroup_rescan_lock);
+
+	if (!trans)
+		return;
+
 	btrfs_end_transaction(trans);
 
 	if (btrfs_fs_closing(fs_info)) {
@@ -3204,12 +3215,6 @@ out:
 	} else {
 		btrfs_err(fs_info, "qgroup scan failed with %d", err);
 	}
-
-done:
-	mutex_lock(&fs_info->qgroup_rescan_lock);
-	fs_info->qgroup_rescan_running = false;
-	mutex_unlock(&fs_info->qgroup_rescan_lock);
-	complete_all(&fs_info->qgroup_rescan_completion);
 }
 
 /*
@@ -3437,6 +3442,9 @@ cleanup:
 	while ((unode = ulist_next(&reserved->range_changed, &uiter)))
 		clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
 				 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL);
+	/* Also free data bytes of already reserved one */
+	btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid,
+				  orig_reserved, BTRFS_QGROUP_RSV_DATA);
 	extent_changeset_release(reserved);
 	return ret;
 }
@@ -3481,7 +3489,7 @@ static int qgroup_free_reserved_data(struct inode *inode,
 		 * EXTENT_QGROUP_RESERVED, we won't double free.
 		 * So not need to rush.
 		 */
-		ret = clear_record_extent_bits(&BTRFS_I(inode)->io_failure_tree,
+		ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree,
 				free_start, free_start + free_len - 1,
 				EXTENT_QGROUP_RESERVED, &changeset);
 		if (ret < 0)

fs/btrfs/relocation.c

@@ -1435,6 +1435,13 @@ int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
 	int clear_rsv = 0;
 	int ret;
 
+	/*
+	 * The subvolume has reloc tree but the swap is finished, no need to
+	 * create/update the dead reloc tree
+	 */
+	if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state))
+		return 0;
+
 	if (root->reloc_root) {
 		reloc_root = root->reloc_root;
 		reloc_root->last_trans = trans->transid;
@@ -2187,7 +2194,6 @@ static int clean_dirty_subvols(struct reloc_control *rc)
 			/* Merged subvolume, cleanup its reloc root */
 			struct btrfs_root *reloc_root = root->reloc_root;
 
-			clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);
 			list_del_init(&root->reloc_dirty_list);
 			root->reloc_root = NULL;
 			if (reloc_root) {
@@ -2196,6 +2202,7 @@ static int clean_dirty_subvols(struct reloc_control *rc)
 				if (ret2 < 0 && !ret)
 					ret = ret2;
 			}
+			clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);
 			btrfs_put_fs_root(root);
 		} else {
 			/* Orphan reloc tree, just clean it up */

fs/btrfs/tests/btrfs-tests.c

@@ -52,7 +52,13 @@ static struct file_system_type test_type = {
 
 struct inode *btrfs_new_test_inode(void)
 {
-	return new_inode(test_mnt->mnt_sb);
+	struct inode *inode;
+
+	inode = new_inode(test_mnt->mnt_sb);
+	if (inode)
+		inode_init_owner(inode, NULL, S_IFREG);
+
+	return inode;
 }
 
 static int btrfs_init_test_fs(void)

fs/btrfs/volumes.c

@@ -4063,7 +4063,13 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
 	}
 
 	num_devices = btrfs_num_devices(fs_info);
-	allowed = 0;
+
+	/*
+	 * SINGLE profile on-disk has no profile bit, but in-memory we have a
+	 * special bit for it, to make it easier to distinguish.  Thus we need
+	 * to set it manually, or balance would refuse the profile.
+	 */
+	allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
 	for (i = 0; i < ARRAY_SIZE(btrfs_raid_array); i++)
 		if (num_devices >= btrfs_raid_array[i].devs_min)
 			allowed |= btrfs_raid_array[i].bg_flag;