From patchwork Mon Aug 15 23:50:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12944329 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0121C282E7 for ; Tue, 16 Aug 2022 06:11:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229618AbiHPGKc (ORCPT ); Tue, 16 Aug 2022 02:10:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229920AbiHPGKG (ORCPT ); Tue, 16 Aug 2022 02:10:06 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA5513033FD; Mon, 15 Aug 2022 16:51:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 48FC7B81255; Mon, 15 Aug 2022 23:51:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C91E7C433D7; Mon, 15 Aug 2022 23:51:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660607504; bh=a8xTPs/2obb/eI5tzoSm2LynkS751CkDAenZ2inY1tU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TIDHnT52CIC7iEoRDh4OsBduyAvii8R2t5iHMJnUWCflD0gCjFXWwCAThH671vGrJ +yDQ2QL/YwTyA12ujc60vjetS4fsHf3ReLIall4qz/uUkY+RO2DK/nTRGSxQxVK8t2 u8iD0vDnfiKsAXSbVdQM9FyiKh0Dzn5TmNmcrwsQsBs/+ypC+PYyecyBsSMFDXKTYL mJ+oLUEaSvIsD8SwjsFbd3PAnHlsWDfV38Z3CUA+eE6kNNWYGgiUL4gxXoa1CmcEe9 ZWuoWclyZPyA6+bV8IflYguDKeWZpH5hU9qRaxXQjgsFmxwaC1HjAFLVbM9InA2/Lc tX8vuCaDFYYdg== From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Matthew Wilcox Subject: [PATCH v2 2/2] fsverity: stop using PG_error to track error status Date: Mon, 15 Aug 2022 16:50:52 -0700 Message-Id: <20220815235052.86545-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220815235052.86545-1-ebiggers@kernel.org> References: <20220815235052.86545-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org From: Eric Biggers As a step towards freeing the PG_error flag for other uses, change ext4 and f2fs to stop using PG_error to track verity errors. Instead, if a verity error occurs, just mark the whole bio as failed. The coarser granularity isn't really a problem since it isn't any worse than what the block layer provides, and errors from a multi-page readahead aren't reported to applications unless a single-page read fails too. f2fs supports compression, which makes the f2fs changes a bit more complicated than desired, but the basic premise still works. Signed-off-by: Eric Biggers --- fs/ext4/readpage.c | 8 ++---- fs/f2fs/compress.c | 64 ++++++++++++++++++++++------------------------ fs/f2fs/data.c | 52 ++++++++++++++++++++----------------- fs/verity/verify.c | 12 ++++----- 4 files changed, 68 insertions(+), 68 deletions(-) diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c index 5ce4706f68a7c6..e604ea4e102b71 100644 --- a/fs/ext4/readpage.c +++ b/fs/ext4/readpage.c @@ -75,14 +75,10 @@ static void __read_end_io(struct bio *bio) bio_for_each_segment_all(bv, bio, iter_all) { page = bv->bv_page; - /* PG_error was set if any post_read step failed */ - if (bio->bi_status || PageError(page)) { + if (bio->bi_status) ClearPageUptodate(page); - /* will re-read again later */ - ClearPageError(page); - } else { + else SetPageUptodate(page); - } unlock_page(page); } if (bio->bi_private) diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index 70e97075e535e5..f54fb3bb74197a 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -1715,50 +1715,27 @@ static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task) } } -/* - * Update and unlock the cluster's pagecache pages, and release the reference to - * the decompress_io_ctx that was being held for I/O completion. - */ -static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed, - bool in_task) +static void f2fs_verify_cluster(struct work_struct *work) { + struct decompress_io_ctx *dic = + container_of(work, struct decompress_io_ctx, verity_work); int i; + /* Verify, update, and unlock the decompressed pages. */ for (i = 0; i < dic->cluster_size; i++) { struct page *rpage = dic->rpages[i]; if (!rpage) continue; - /* PG_error was set if verity failed. */ - if (failed || PageError(rpage)) { - ClearPageUptodate(rpage); - /* will re-read again later */ - ClearPageError(rpage); - } else { + if (fsverity_verify_page(rpage)) SetPageUptodate(rpage); - } + else + ClearPageUptodate(rpage); unlock_page(rpage); } - f2fs_put_dic(dic, in_task); -} - -static void f2fs_verify_cluster(struct work_struct *work) -{ - struct decompress_io_ctx *dic = - container_of(work, struct decompress_io_ctx, verity_work); - int i; - - /* Verify the cluster's decompressed pages with fs-verity. */ - for (i = 0; i < dic->cluster_size; i++) { - struct page *rpage = dic->rpages[i]; - - if (rpage && !fsverity_verify_page(rpage)) - SetPageError(rpage); - } - - __f2fs_decompress_end_io(dic, false, true); + f2fs_put_dic(dic, true); } /* @@ -1768,6 +1745,8 @@ static void f2fs_verify_cluster(struct work_struct *work) void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed, bool in_task) { + int i; + if (!failed && dic->need_verity) { /* * Note that to avoid deadlocks, the verity work can't be done @@ -1777,9 +1756,28 @@ void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed, */ INIT_WORK(&dic->verity_work, f2fs_verify_cluster); fsverity_enqueue_verify_work(&dic->verity_work); - } else { - __f2fs_decompress_end_io(dic, failed, in_task); + return; + } + + /* Update and unlock the cluster's pagecache pages. */ + for (i = 0; i < dic->cluster_size; i++) { + struct page *rpage = dic->rpages[i]; + + if (!rpage) + continue; + + if (failed) + ClearPageUptodate(rpage); + else + SetPageUptodate(rpage); + unlock_page(rpage); } + + /* + * Release the reference to the decompress_io_ctx that was being held + * for I/O completion. + */ + f2fs_put_dic(dic, in_task); } /* diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 93cc2ec51c2aeb..34af260975a2e6 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -119,34 +119,41 @@ struct bio_post_read_ctx { block_t fs_blkaddr; }; -static void f2fs_finish_read_bio(struct bio *bio, bool in_task) +/* + * Update and unlock a bio's pages, and free the bio. + * + * This marks pages up-to-date only if there was no error in the bio (I/O error, + * decryption error, or verity error), as indicated by bio->bi_status. + * + * "Compressed pages" (pagecache pages backed by a compressed cluster on-disk) + * aren't marked up-to-date here, as decompression is done on a per-compression- + * cluster basis rather than a per-bio basis. Instead, we only must do two + * things for each compressed page here: call f2fs_end_read_compressed_page() + * with failed=true if an error occurred before it would have normally gotten + * called (i.e., I/O error or decryption error, but *not* verity error), and + * release the bio's reference to the decompress_io_ctx of the page's cluster. + */ +static void f2fs_finish_read_bio(struct bio *bio, bool in_task, + bool fail_compressed) { struct bio_vec *bv; struct bvec_iter_all iter_all; - /* - * Update and unlock the bio's pagecache pages, and put the - * decompression context for any compressed pages. - */ bio_for_each_segment_all(bv, bio, iter_all) { struct page *page = bv->bv_page; if (f2fs_is_compressed_page(page)) { - if (bio->bi_status) + if (fail_compressed) f2fs_end_read_compressed_page(page, true, 0, in_task); f2fs_put_page_dic(page, in_task); continue; } - /* PG_error was set if verity failed. */ - if (bio->bi_status || PageError(page)) { + if (bio->bi_status) ClearPageUptodate(page); - /* will re-read again later */ - ClearPageError(page); - } else { + else SetPageUptodate(page); - } dec_page_count(F2FS_P_SB(page), __read_io_type(page)); unlock_page(page); } @@ -185,14 +192,17 @@ static void f2fs_verify_bio(struct work_struct *work) struct page *page = bv->bv_page; if (!f2fs_is_compressed_page(page) && - !fsverity_verify_page(page)) - SetPageError(page); + !fsverity_verify_page(page)) { + bio->bi_status = BLK_STS_IOERR; + break; + } } } else { fsverity_verify_bio(bio); } - f2fs_finish_read_bio(bio, true); + f2fs_finish_read_bio(bio, true /* in_task */, + false /* fail_compressed */); } /* @@ -212,7 +222,7 @@ static void f2fs_verify_and_finish_bio(struct bio *bio, bool in_task) INIT_WORK(&ctx->work, f2fs_verify_bio); fsverity_enqueue_verify_work(&ctx->work); } else { - f2fs_finish_read_bio(bio, in_task); + f2fs_finish_read_bio(bio, in_task, false /* fail_compressed */); } } @@ -261,7 +271,8 @@ static void f2fs_post_read_work(struct work_struct *work) struct bio *bio = ctx->bio; if ((ctx->enabled_steps & STEP_DECRYPT) && !fscrypt_decrypt_bio(bio)) { - f2fs_finish_read_bio(bio, true); + f2fs_finish_read_bio(bio, true /* in_task */, + true /* fail_compressed */); return; } @@ -286,7 +297,7 @@ static void f2fs_read_end_io(struct bio *bio) } if (bio->bi_status) { - f2fs_finish_read_bio(bio, intask); + f2fs_finish_read_bio(bio, intask, true /* fail_compressed */); return; } @@ -1083,7 +1094,6 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page, bio_put(bio); return -EFAULT; } - ClearPageError(page); inc_page_count(sbi, F2FS_RD_DATA); f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE); __submit_bio(sbi, bio, DATA); @@ -2125,7 +2135,6 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page, inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA); f2fs_update_iostat(F2FS_I_SB(inode), FS_DATA_READ_IO, F2FS_BLKSIZE); - ClearPageError(page); *last_block_in_bio = block_nr; goto out; out: @@ -2274,7 +2283,6 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret, inc_page_count(sbi, F2FS_RD_DATA); f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE); f2fs_update_iostat(sbi, FS_CDATA_READ_IO, F2FS_BLKSIZE); - ClearPageError(page); *last_block_in_bio = blkaddr; } @@ -2291,7 +2299,6 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret, for (i = 0; i < cc->cluster_size; i++) { if (cc->rpages[i]) { ClearPageUptodate(cc->rpages[i]); - ClearPageError(cc->rpages[i]); unlock_page(cc->rpages[i]); } } @@ -2388,7 +2395,6 @@ static int f2fs_mpage_readpages(struct inode *inode, #ifdef CONFIG_F2FS_FS_COMPRESSION set_error_page: #endif - SetPageError(page); zero_user_segment(page, 0, PAGE_SIZE); unlock_page(page); } diff --git a/fs/verity/verify.c b/fs/verity/verify.c index 14e2fb49cff561..556dfbd4698dea 100644 --- a/fs/verity/verify.c +++ b/fs/verity/verify.c @@ -210,9 +210,8 @@ EXPORT_SYMBOL_GPL(fsverity_verify_page); * @bio: the bio to verify * * Verify a set of pages that have just been read from a verity file. The pages - * must be pagecache pages that are still locked and not yet uptodate. Pages - * that fail verification are set to the Error state. Verification is skipped - * for pages already in the Error state, e.g. due to fscrypt decryption failure. + * must be pagecache pages that are still locked and not yet uptodate. If a + * page fails verification, then bio->bi_status is set to an error status. * * This is a helper function for use by the ->readahead() method of filesystems * that issue bios to read data directly into the page cache. Filesystems that @@ -254,9 +253,10 @@ void fsverity_verify_bio(struct bio *bio) unsigned long level0_ra_pages = min(max_ra_pages, params->level0_blocks - level0_index); - if (!PageError(page) && - !verify_page(inode, vi, req, page, level0_ra_pages)) - SetPageError(page); + if (!verify_page(inode, vi, req, page, level0_ra_pages)) { + bio->bi_status = BLK_STS_IOERR; + break; + } } fsverity_free_hash_request(params->hash_alg, req);