add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/btrfs/ioctl.c
..
..
@@ -2550,6 +2550,13 @@
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 				goto out_put;
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 			}
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+			/*
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+			 * We don't need the path anymore, so release it and
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+			 * avoid deadlocks and lockdep warnings in case
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+			 * btrfs_iget() needs to lookup the inode from its root
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+			 * btree and lock the same leaf.
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+			 */
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+			btrfs_release_path(path);
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 			temp_inode = btrfs_iget(sb, key2.objectid, root);
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 			if (IS_ERR(temp_inode)) {
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 				ret = PTR_ERR(temp_inode);
..
..
@@ -2569,7 +2576,6 @@
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 				goto out_put;
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 			}
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-			btrfs_release_path(path);
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 			key.objectid = key.offset;
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 			key.offset = (u64)-1;
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 			dirid = key.objectid;
..
..
@@ -3401,13 +3407,10 @@
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 	di_args->bytes_used = btrfs_device_get_bytes_used(dev);
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 	di_args->total_bytes = btrfs_device_get_total_bytes(dev);
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 	memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
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-	if (dev->name) {
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-		strncpy(di_args->path, rcu_str_deref(dev->name),
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-				sizeof(di_args->path) - 1);
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-		di_args->path[sizeof(di_args->path) - 1] = 0;
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-	} else {
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+	if (dev->name)
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+		strscpy(di_args->path, rcu_str_deref(dev->name), sizeof(di_args->path));
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+	else
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 		di_args->path[0] = '\0';
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-	}
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 out:
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 	rcu_read_unlock();
..
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@@ -3704,6 +3707,11 @@
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 	sa = memdup_user(arg, sizeof(*sa));
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 	if (IS_ERR(sa))
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 		return PTR_ERR(sa);
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+
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+	if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) {
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+		ret = -EOPNOTSUPP;
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+		goto out;
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+	}
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 	if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
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 		ret = mnt_want_write_file(file);
..
..
@@ -4257,7 +4265,9 @@
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 	}
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 	/* update qgroup status and info */
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+	mutex_lock(&fs_info->qgroup_ioctl_lock);
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 	err = btrfs_run_qgroups(trans);
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+	mutex_unlock(&fs_info->qgroup_ioctl_lock);
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 	if (err < 0)
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 		btrfs_handle_fs_error(fs_info, err,
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 				      "failed to update qgroup status and info");