linux-xfs.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Dave Chinner <david@fromorbit.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH 01/16] xfs: sb verifier doesn't handle uncached sb buffer
Date: Thu, 19 Aug 2021 09:59:20 +1000	[thread overview]
Message-ID: <20210818235935.149431-2-david@fromorbit.com> (raw)
In-Reply-To: <20210818235935.149431-1-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

The verifier checks explicitly for bp->b_bn == XFS_SB_DADDR to match
the primary superblock buffer, but the primary superblock is an
uncached buffer and so bp->b_bn is always -1ULL. Hence this never
matches and the CRC error reporting is wholly dependent on the
mount superblock already being populated so CRC feature checks pass
and allow CRC errors to be reported.

Fix this so that the primary superblock CRC error reporting is not
dependent on already having read the superblock into memory.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_sb.c | 2 +-
 fs/xfs/xfs_buf.h       | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 04f5386446db..4a4586bd2ba2 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -636,7 +636,7 @@ xfs_sb_read_verify(
 
 		if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
 			/* Only fail bad secondaries on a known V5 filesystem */
-			if (bp->b_bn == XFS_SB_DADDR ||
+			if (bp->b_maps[0].bm_bn == XFS_SB_DADDR ||
 			    xfs_sb_version_hascrc(&mp->m_sb)) {
 				error = -EFSBADCRC;
 				goto out_error;
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index cfbe37d73293..37c9004f11de 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -133,7 +133,12 @@ struct xfs_buf {
 	 * fast-path on locking.
 	 */
 	struct rhash_head	b_rhash_head;	/* pag buffer hash node */
-	xfs_daddr_t		b_bn;		/* block number of buffer */
+
+	/*
+	 * b_bn is the cache index. Do not use directly, use b_maps[0].bm_bn
+	 * for the buffer disk address instead.
+	 */
+	xfs_daddr_t		b_bn;
 	int			b_length;	/* size of buffer in BBs */
 	atomic_t		b_hold;		/* reference count */
 	atomic_t		b_lru_ref;	/* lru reclaim ref count */
-- 
2.31.1


  reply	other threads:[~2021-08-18 23:59 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 23:59 [PATCH 00/16 v3] xfs: rework feature flags Dave Chinner
2021-08-18 23:59 ` Dave Chinner [this message]
2021-08-18 23:59 ` [PATCH 02/16] xfs: rename xfs_has_attr() Dave Chinner
2021-08-18 23:59 ` [PATCH 03/16] xfs: rework attr2 feature and mount options Dave Chinner
2021-08-18 23:59 ` [PATCH 04/16] xfs: reflect sb features in xfs_mount Dave Chinner
2021-08-18 23:59 ` [PATCH 05/16] xfs: replace xfs_sb_version checks with feature flag checks Dave Chinner
2021-08-18 23:59 ` [PATCH 06/16] xfs: consolidate mount option features in m_features Dave Chinner
2021-08-18 23:59 ` [PATCH 07/16] xfs: convert mount flags to features Dave Chinner
2021-08-19  2:14   ` Darrick J. Wong
2021-08-18 23:59 ` [PATCH 08/16] xfs: convert remaining mount flags to state flags Dave Chinner
2021-08-18 23:59 ` [PATCH 09/16] xfs: replace XFS_FORCED_SHUTDOWN with xfs_is_shutdown Dave Chinner
2021-08-18 23:59 ` [PATCH 10/16] xfs: convert xfs_fs_geometry to use mount feature checks Dave Chinner
2021-08-18 23:59 ` [PATCH 11/16] xfs: open code sb verifier " Dave Chinner
2021-08-18 23:59 ` [PATCH 12/16] xfs: convert scrub to use mount-based " Dave Chinner
2021-08-18 23:59 ` [PATCH 13/16] xfs: convert xfs_sb_version_has checks to use mount features Dave Chinner
2021-08-18 23:59 ` [PATCH 14/16] xfs: remove unused xfs_sb_version_has wrappers Dave Chinner
2021-08-18 23:59 ` [PATCH 15/16] xfs: introduce xfs_sb_is_v5 helper Dave Chinner
2021-08-18 23:59 ` [PATCH 16/16] xfs: kill xfs_sb_version_has_v3inode() Dave Chinner
  -- strict thread matches above, loose matches on Subject: below --
2021-08-10  5:24 [PATCH 00/16 v2] xfs: rework feature flags Dave Chinner
2021-08-10  5:24 ` [PATCH 01/16] xfs: sb verifier doesn't handle uncached sb buffer Dave Chinner
2021-08-11  0:34   ` Darrick J. Wong
2021-08-12  7:52   ` Christoph Hellwig
2021-07-14  4:18 [PATCH 00/16] xfs: rework feature flags Dave Chinner
2021-07-14  4:18 ` [PATCH 01/16] xfs: sb verifier doesn't handle uncached sb buffer Dave Chinner
2021-07-14  6:43   ` Christoph Hellwig
2021-07-14  9:37     ` Dave Chinner
2021-07-14 22:44   ` Darrick J. Wong
2021-07-14 23:00     ` Dave Chinner
2021-07-14 23:03       ` Darrick J. Wong

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210818235935.149431-2-david@fromorbit.com \
    --to=david@fromorbit.com \
    --cc=linux-xfs@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).