From: "Darrick J. Wong" Subject: [PATCH 20/51] e2fsck: Verify extent tree blocks and clear the bad ones Date: Tue, 13 Dec 2011 17:15:31 -0800 Message-ID: <20111214011531.20947.535.stgit@elm3c44.beaverton.ibm.com> References: <20111214011316.20947.13706.stgit@elm3c44.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Sunil Mushran , Amir Goldstein , Andi Kleen , Mingming Cao , Joel Becker , linux-ext4@vger.kernel.org, Coly Li To: Andreas Dilger , Theodore Tso , "Darrick J. Wong" Return-path: Received: from e3.ny.us.ibm.com ([32.97.182.143]:51442 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753926Ab1LNBPi (ORCPT ); Tue, 13 Dec 2011 20:15:38 -0500 Received: from /spool/local by e3.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 13 Dec 2011 20:15:38 -0500 Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay07.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id pBE1FYRq3649606 for ; Tue, 13 Dec 2011 20:15:34 -0500 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id pBE1FXD1012544 for ; Tue, 13 Dec 2011 20:15:34 -0500 In-Reply-To: <20111214011316.20947.13706.stgit@elm3c44.beaverton.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: When we encounter an extent tree block that passes the header check but fails the checksum, offer to clear just that extent block instead of failing the whole tree, which results in the entire inode being wiped out. Signed-off-by: Darrick J. Wong --- e2fsck/pass1.c | 11 +++++++++-- e2fsck/problem.c | 6 ++++++ e2fsck/problem.h | 3 +++ 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c index 15320c6..7cfc739 100644 --- a/e2fsck/pass1.c +++ b/e2fsck/pass1.c @@ -1761,7 +1761,9 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx, pctx->errcode = ext2fs_extent_get(ehandle, EXT2_EXTENT_FIRST_SIB, &extent); - while (!pctx->errcode && info.num_entries-- > 0) { + while ((pctx->errcode == 0 || + pctx->errcode == EXT2_ET_EXTENT_CSUM_INVALID) && + info.num_entries-- > 0) { is_leaf = extent.e_flags & EXT2_EXTENT_FLAGS_LEAF; is_dir = LINUX_S_ISDIR(pctx->inode->i_mode); @@ -1776,6 +1778,8 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx, (extent.e_pblk + extent.e_len) > ext2fs_blocks_count(ctx->fs->super)) problem = PR_1_EXTENT_ENDS_BEYOND; + else if (pctx->errcode == EXT2_ET_EXTENT_CSUM_INVALID) + problem = PR_1_EXTENT_CSUM_INVALID; if (problem) { report_problem: @@ -1809,7 +1813,10 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx, if (pctx->errcode) { pctx->str = "EXT2_EXTENT_DOWN"; problem = PR_1_EXTENT_HEADER_INVALID; - if (pctx->errcode == EXT2_ET_EXTENT_HEADER_BAD) + if (pctx->errcode == + EXT2_ET_EXTENT_HEADER_BAD || + pctx->errcode == + EXT2_ET_EXTENT_CSUM_INVALID) goto report_problem; return; } diff --git a/e2fsck/problem.c b/e2fsck/problem.c index e74ad79..96b0de5 100644 --- a/e2fsck/problem.c +++ b/e2fsck/problem.c @@ -946,6 +946,12 @@ static struct e2fsck_problem problem_table[] = { N_("The bad @b @i looks @n. "), PROMPT_CLEAR, 0 }, + /* Extent block does not match extent */ + { PR_1_EXTENT_CSUM_INVALID, + N_("@i %i extent block checksum does not match extent\n\t(logical @b " + "%c, @n physical @b %b, len %N)\n"), + PROMPT_CLEAR, 0 }, + /* Pass 1b errors */ /* Pass 1B: Rescan for duplicate/bad blocks */ diff --git a/e2fsck/problem.h b/e2fsck/problem.h index 1d63598..a1e7ffb 100644 --- a/e2fsck/problem.h +++ b/e2fsck/problem.h @@ -553,6 +553,9 @@ struct problem_context { /* inode checksum does not match inode */ #define PR_1_INODE_CSUM_INVALID 0x010066 +/* extent block checksum does not match extent block */ +#define PR_1_EXTENT_CSUM_INVALID 0x010067 + /* * Pass 1b errors */