From patchwork Wed Oct 24 12:24:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lu Fengqi X-Patchwork-Id: 10654583 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4676F17F3 for ; Wed, 24 Oct 2018 12:24:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 304062A03F for ; Wed, 24 Oct 2018 12:24:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 24CA02A265; Wed, 24 Oct 2018 12:24:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 834762A26A for ; Wed, 24 Oct 2018 12:24:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727543AbeJXUwR (ORCPT ); Wed, 24 Oct 2018 16:52:17 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:51970 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727411AbeJXUwQ (ORCPT ); Wed, 24 Oct 2018 16:52:16 -0400 X-IronPort-AV: E=Sophos;i="5.43,368,1503331200"; d="scan'208";a="46658921" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Oct 2018 20:24:15 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id CA4114B714A5; Wed, 24 Oct 2018 20:24:11 +0800 (CST) Received: from fnst.lan (10.167.226.155) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.408.0; Wed, 24 Oct 2018 20:24:16 +0800 From: Lu Fengqi To: CC: Qu Wenruo Subject: [PATCH 1/3] btrfs: extent-tree: Detect bytes_may_use underflow earlier Date: Wed, 24 Oct 2018 20:24:01 +0800 Message-ID: <20181024122403.17418-2-lufq.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181024122403.17418-1-lufq.fnst@cn.fujitsu.com> References: <20181024122403.17418-1-lufq.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.155] X-yoursite-MailScanner-ID: CA4114B714A5.A78D2 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: lufq.fnst@cn.fujitsu.com Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Qu Wenruo Although we have space_info::bytes_may_use underflow detection in btrfs_free_reserved_data_space_noquota(), we have more callers who are subtracting number from space_info::bytes_may_use. So instead of doing underflow detection for every caller, introduce a new wrapper update_bytes_may_use() to replace open coded bytes_may_use modifiers. This also introduce a macro to declare more wrappers, but currently space_info::bytes_may_use is the mostly interesting one. Signed-off-by: Qu Wenruo --- fs/btrfs/extent-tree.c | 44 +++++++++++++++++++++++++++--------------- 1 file changed, 28 insertions(+), 16 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a1febf155747..c0147a1307e7 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -51,6 +51,21 @@ enum { CHUNK_ALLOC_FORCE = 2, }; +/* Helper function to detect various space info bytes underflow */ +#define DECLARE_SPACE_INFO_UPDATE(name) \ +static inline void update_##name(struct btrfs_space_info *sinfo, \ + s64 bytes) \ +{ \ + if (bytes < 0 && sinfo->name < -bytes) { \ + WARN_ON(1); \ + sinfo->name = 0; \ + return; \ + } \ + sinfo->name += bytes; \ +} + +DECLARE_SPACE_INFO_UPDATE(bytes_may_use); + static int __btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_delayed_ref_node *node, u64 parent, u64 root_objectid, u64 owner_objectid, @@ -4256,7 +4271,7 @@ int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes) data_sinfo->flags, bytes, 1); return -ENOSPC; } - data_sinfo->bytes_may_use += bytes; + update_bytes_may_use(data_sinfo, bytes); trace_btrfs_space_reservation(fs_info, "space_info", data_sinfo->flags, bytes, 1); spin_unlock(&data_sinfo->lock); @@ -4309,10 +4324,7 @@ void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start, data_sinfo = fs_info->data_sinfo; spin_lock(&data_sinfo->lock); - if (WARN_ON(data_sinfo->bytes_may_use < len)) - data_sinfo->bytes_may_use = 0; - else - data_sinfo->bytes_may_use -= len; + update_bytes_may_use(data_sinfo, -len); trace_btrfs_space_reservation(fs_info, "space_info", data_sinfo->flags, len, 0); spin_unlock(&data_sinfo->lock); @@ -5108,7 +5120,7 @@ static int wait_reserve_ticket(struct btrfs_fs_info *fs_info, list_del_init(&ticket->list); if (ticket->bytes && ticket->bytes < orig_bytes) { u64 num_bytes = orig_bytes - ticket->bytes; - space_info->bytes_may_use -= num_bytes; + update_bytes_may_use(space_info, -num_bytes); trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, num_bytes, 0); } @@ -5154,13 +5166,13 @@ static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info, * If not things get more complicated. */ if (used + orig_bytes <= space_info->total_bytes) { - space_info->bytes_may_use += orig_bytes; + update_bytes_may_use(space_info, orig_bytes); trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, orig_bytes, 1); ret = 0; } else if (can_overcommit(fs_info, space_info, orig_bytes, flush, system_chunk)) { - space_info->bytes_may_use += orig_bytes; + update_bytes_may_use(space_info, orig_bytes); trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, orig_bytes, 1); ret = 0; @@ -5223,7 +5235,7 @@ static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info, if (ticket.bytes) { if (ticket.bytes < orig_bytes) { u64 num_bytes = orig_bytes - ticket.bytes; - space_info->bytes_may_use -= num_bytes; + update_bytes_may_use(space_info, -num_bytes); trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, num_bytes, 0); @@ -5407,7 +5419,7 @@ static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info, flush = BTRFS_RESERVE_FLUSH_ALL; goto again; } - space_info->bytes_may_use -= num_bytes; + update_bytes_may_use(space_info, -num_bytes); trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, num_bytes, 0); spin_unlock(&space_info->lock); @@ -5435,7 +5447,7 @@ static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, ticket->bytes, 1); list_del_init(&ticket->list); num_bytes -= ticket->bytes; - space_info->bytes_may_use += ticket->bytes; + update_bytes_may_use(space_info, ticket->bytes); ticket->bytes = 0; space_info->tickets_id++; wake_up(&ticket->wait); @@ -5443,7 +5455,7 @@ static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info, trace_btrfs_space_reservation(fs_info, "space_info", space_info->flags, num_bytes, 1); - space_info->bytes_may_use += num_bytes; + update_bytes_may_use(space_info, num_bytes); ticket->bytes -= num_bytes; num_bytes = 0; } @@ -5750,14 +5762,14 @@ static void update_global_block_rsv(struct btrfs_fs_info *fs_info) num_bytes = min(num_bytes, block_rsv->size - block_rsv->reserved); block_rsv->reserved += num_bytes; - sinfo->bytes_may_use += num_bytes; + update_bytes_may_use(sinfo, num_bytes); trace_btrfs_space_reservation(fs_info, "space_info", sinfo->flags, num_bytes, 1); } } else if (block_rsv->reserved > block_rsv->size) { num_bytes = block_rsv->reserved - block_rsv->size; - sinfo->bytes_may_use -= num_bytes; + update_bytes_may_use(sinfo, -num_bytes); trace_btrfs_space_reservation(fs_info, "space_info", sinfo->flags, num_bytes, 0); block_rsv->reserved = block_rsv->size; @@ -6431,7 +6443,7 @@ static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache, } else { cache->reserved += num_bytes; space_info->bytes_reserved += num_bytes; - space_info->bytes_may_use -= ram_bytes; + update_bytes_may_use(space_info, -ram_bytes); if (delalloc) cache->delalloc_bytes += num_bytes; } @@ -6608,7 +6620,7 @@ static int unpin_extent_range(struct btrfs_fs_info *fs_info, to_add = min(len, global_rsv->size - global_rsv->reserved); global_rsv->reserved += to_add; - space_info->bytes_may_use += to_add; + update_bytes_may_use(space_info, to_add); if (global_rsv->reserved >= global_rsv->size) global_rsv->full = 1; trace_btrfs_space_reservation(fs_info,