From patchwork Tue Jun 15 12:18:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 12321217 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52EDAC48BE8 for ; Tue, 15 Jun 2021 12:18:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3700F61462 for ; Tue, 15 Jun 2021 12:18:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230334AbhFOMUx (ORCPT ); Tue, 15 Jun 2021 08:20:53 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:33632 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230330AbhFOMUw (ORCPT ); Tue, 15 Jun 2021 08:20:52 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 5D2971FD81 for ; Tue, 15 Jun 2021 12:18:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623759527; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gm9o9K9yix+0Nha472yRcJrGz6kxwEHTotvYS8uosMY=; b=kqs+JXjldm5d2Xxe1IWqZNaCNtmpS+eoHr0K2cUdCPOG8swCfczC03SLlNRYnyi7mMsDIS PuV9pnSrEHsJOQMOTmg4RviPzdYTaoWz6fe3nUC2RAb7wkKZQnfIjhe9OQ42ah5hsnD2V/ yiG06kcNZ+i+9MI0vGLvxa91kDh2MUU= Received: from adam-pc.lan (unknown [10.163.16.38]) by relay2.suse.de (Postfix) with ESMTP id 67350A3B8E for ; Tue, 15 Jun 2021 12:18:46 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v3 4/9] btrfs: hunt down the BUG_ON()s inside btrfs_submit_compressed_write() Date: Tue, 15 Jun 2021 20:18:31 +0800 Message-Id: <20210615121836.365105-5-wqu@suse.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210615121836.365105-1-wqu@suse.com> References: <20210615121836.365105-1-wqu@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Just like btrfs_submit_compressed_read(), there are quite some BUG_ON()s inside btrfs_submit_compressed_write() for the bio submission path. Fix them using the same method: - For last bio, just endio the bio As in that case, one of the endio function of all these submitted bio will be able to free the compressed_bio - For half-submitted bio, wait and finish the compressed_bio manually In this case, as long as all other bio finishes, we're the only one referring the compressed bio, and can manually finish it. Signed-off-by: Qu Wenruo --- fs/btrfs/compression.c | 103 ++++++++++++++++++++++++++--------------- 1 file changed, 66 insertions(+), 37 deletions(-) diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index abbdb8d35001..706efa2d1438 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -371,50 +371,56 @@ static noinline void end_compressed_writeback(struct inode *inode, /* the inode may be gone now */ } -/* - * do the cleanup once all the compressed pages hit the disk. - * This will clear writeback on the file pages and free the compressed - * pages. - * - * This also calls the writeback end hooks for the file pages so that - * metadata and checksums can be updated in the file. - */ -static void end_compressed_bio_write(struct bio *bio) +static void finish_compressed_bio_write(struct compressed_bio *cb) { - struct compressed_bio *cb = bio->bi_private; - struct inode *inode; - struct page *page; + struct inode *inode = cb->inode; unsigned int index; - if (!dec_and_test_compressed_bio(cb, bio)) - goto out; - - /* ok, we're the last bio for this extent, step one is to - * call back into the FS and do all the end_io operations + /* + * Ok, we're the last bio for this extent, step one is to + * call back into the FS and do all the end_io operations. */ - inode = cb->inode; - btrfs_record_physical_zoned(inode, cb->start, bio); btrfs_writepage_endio_finish_ordered(BTRFS_I(inode), NULL, cb->start, cb->start + cb->len - 1, - bio->bi_status == BLK_STS_OK); + !cb->errors); end_compressed_writeback(inode, cb); - /* note, our inode could be gone now */ + /* Note, our inode could be gone now */ /* - * release the compressed pages, these came from alloc_page and + * Release the compressed pages, these came from alloc_page and * are not attached to the inode at all */ - index = 0; for (index = 0; index < cb->nr_pages; index++) { - page = cb->compressed_pages[index]; + struct page *page = cb->compressed_pages[index]; + page->mapping = NULL; put_page(page); } - /* finally free the cb struct */ + /* Finally free the cb struct */ kfree(cb->compressed_pages); kfree(cb); +} + +/* + * do the cleanup once all the compressed pages hit the disk. + * This will clear writeback on the file pages and free the compressed + * pages. + * + * This also calls the writeback end hooks for the file pages so that + * metadata and checksums can be updated in the file. + */ +static void end_compressed_bio_write(struct bio *bio) +{ + struct compressed_bio *cb = bio->bi_private; + + if (!dec_and_test_compressed_bio(cb, bio)) + goto out; + + btrfs_record_physical_zoned(cb->inode, cb->start, bio); + + finish_compressed_bio_write(cb); out: bio_put(bio); } @@ -517,18 +523,18 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, atomic_inc(&cb->pending_bios); ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA); - BUG_ON(ret); /* -ENOMEM */ + if (ret) + goto finish_cb; if (!skip_sum) { ret = btrfs_csum_one_bio(inode, bio, start, 1); - BUG_ON(ret); /* -ENOMEM */ + if (ret) + goto finish_cb; } ret = btrfs_map_bio(fs_info, bio, 0); - if (ret) { - bio->bi_status = ret; - bio_endio(bio); - } + if (ret) + goto finish_cb; bio = btrfs_bio_alloc(first_byte); bio->bi_opf = bio_op | write_flags; @@ -554,23 +560,46 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, atomic_inc(&cb->pending_bios); ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA); - BUG_ON(ret); /* -ENOMEM */ + if (ret) + goto last_bio; if (!skip_sum) { ret = btrfs_csum_one_bio(inode, bio, start, 1); - BUG_ON(ret); /* -ENOMEM */ + if (ret) + goto last_bio; } ret = btrfs_map_bio(fs_info, bio, 0); - if (ret) { - bio->bi_status = ret; - bio_endio(bio); - } + if (ret) + goto last_bio; if (blkcg_css) kthread_associate_blkcg(NULL); return 0; +last_bio: + cb->errors = 1; + bio->bi_status = ret; + /* One of the bios' endio function will free @cb. */ + bio_endio(bio); + return ret; + +finish_cb: + cb->errors = 1; + if (bio) { + bio->bi_status = ret; + bio_endio(bio); + } + + /* + * Even with previous bio ended, we should still have io not yet + * submitted, thus need to finish manually. + */ + ASSERT(atomic_read(&cb->io_sectors)); + wait_event(cb->pending_bio_wait, atomic_read(&cb->pending_bios) == 0); + /* Now we are the only one referring @cb, can finish it safely. */ + finish_compressed_bio_write(cb); + return ret; } static u64 bio_end_offset(struct bio *bio)