From: Brian Foster <bfoster@redhat.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 09/10] xfs: validate feature support when recovering rmap/refcount/bmap intents
Date: Fri, 4 Dec 2020 09:00:36 -0500 [thread overview]
Message-ID: <20201204140036.GK1404170@bfoster> (raw)
In-Reply-To: <160704435080.734470.11175993745850698818.stgit@magnolia>
On Thu, Dec 03, 2020 at 05:12:30PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
>
> The bmap, rmap, and refcount log intent items were added to support the
> rmap and reflink features. Because these features come with changes to
> the ondisk format, the log items aren't tied to a log incompat flag.
>
> However, the log recovery routines don't actually check for those
> feature flags. The kernel has no business replayng an intent item for a
> feature that isn't enabled, so check that as part of recovered log item
> validation. (Note that kernels pre-dating rmap and reflink will fail
> the mount on the unknown log item type code.)
>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---
> fs/xfs/xfs_bmap_item.c | 4 ++++
> fs/xfs/xfs_refcount_item.c | 3 +++
> fs/xfs/xfs_rmap_item.c | 3 +++
> 3 files changed, 10 insertions(+)
>
>
> diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
> index 78346d47564b..4ea9132716c6 100644
> --- a/fs/xfs/xfs_bmap_item.c
> +++ b/fs/xfs/xfs_bmap_item.c
> @@ -425,6 +425,10 @@ xfs_bui_validate(
> {
> struct xfs_map_extent *bmap;
>
> + if (!xfs_sb_version_hasrmapbt(&mp->m_sb) &&
> + !xfs_sb_version_hasreflink(&mp->m_sb))
> + return false;
> +
Took me a minute to realize we use the map/unmap for extent swap if rmap
is enabled. That does make me wonder a bit.. had we made this kind of
recovery feature validation change before that came around (such that we
probably would have only checked _hasreflink() here), would we have
created an unnecessary backwards incompatibility?
Brian
> /* Only one mapping operation per BUI... */
> if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS)
> return false;
> diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
> index 8ad6c81f6d8f..2b28f5643c0b 100644
> --- a/fs/xfs/xfs_refcount_item.c
> +++ b/fs/xfs/xfs_refcount_item.c
> @@ -423,6 +423,9 @@ xfs_cui_validate_phys(
> struct xfs_mount *mp,
> struct xfs_phys_extent *refc)
> {
> + if (!xfs_sb_version_hasreflink(&mp->m_sb))
> + return false;
> +
> if (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)
> return false;
>
> diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
> index f296ec349936..2628bc0080fe 100644
> --- a/fs/xfs/xfs_rmap_item.c
> +++ b/fs/xfs/xfs_rmap_item.c
> @@ -466,6 +466,9 @@ xfs_rui_validate_map(
> struct xfs_mount *mp,
> struct xfs_map_extent *rmap)
> {
> + if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
> + return false;
> +
> if (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)
> return false;
>
>
next prev parent reply other threads:[~2020-12-04 14:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 1:11 [PATCH v2 00/10] xfs: strengthen log intent validation Darrick J. Wong
2020-12-04 1:11 ` [PATCH 01/10] xfs: hoist recovered bmap intent checks out of xfs_bui_item_recover Darrick J. Wong
2020-12-04 13:55 ` Brian Foster
2020-12-04 1:11 ` [PATCH 02/10] xfs: improve the code that checks recovered bmap intent items Darrick J. Wong
2020-12-04 13:56 ` Brian Foster
2020-12-04 19:54 ` Darrick J. Wong
2020-12-04 1:11 ` [PATCH 03/10] xfs: hoist recovered rmap intent checks out of xfs_rui_item_recover Darrick J. Wong
2020-12-04 13:59 ` Brian Foster
2020-12-04 1:12 ` [PATCH 04/10] xfs: improve the code that checks recovered rmap intent items Darrick J. Wong
2020-12-04 13:59 ` Brian Foster
2020-12-04 1:12 ` [PATCH 05/10] xfs: hoist recovered refcount intent checks out of xfs_cui_item_recover Darrick J. Wong
2020-12-04 14:00 ` Brian Foster
2020-12-04 1:12 ` [PATCH 06/10] xfs: improve the code that checks recovered refcount intent items Darrick J. Wong
2020-12-04 14:00 ` Brian Foster
2020-12-04 1:12 ` [PATCH 07/10] xfs: hoist recovered extent-free intent checks out of xfs_efi_item_recover Darrick J. Wong
2020-12-04 14:00 ` Brian Foster
2020-12-04 1:12 ` [PATCH 08/10] xfs: improve the code that checks recovered extent-free intent items Darrick J. Wong
2020-12-04 14:00 ` Brian Foster
2020-12-04 1:12 ` [PATCH 09/10] xfs: validate feature support when recovering rmap/refcount/bmap intents Darrick J. Wong
2020-12-04 14:00 ` Brian Foster [this message]
2020-12-06 23:08 ` Darrick J. Wong
2020-12-07 14:02 ` Brian Foster
2020-12-07 16:50 ` Darrick J. Wong
2020-12-04 1:12 ` [PATCH 10/10] xfs: trace log intent item recovery failures Darrick J. Wong
2020-12-04 14:00 ` Brian Foster
2020-12-04 19:57 ` Darrick J. Wong
-- strict thread matches above, loose matches on Subject: below --
2020-12-06 23:09 [PATCH v3 00/10] xfs: strengthen log intent validation Darrick J. Wong
2020-12-06 23:10 ` [PATCH 09/10] xfs: validate feature support when recovering rmap/refcount/bmap intents Darrick J. Wong
2020-12-01 3:37 [PATCH 00/10] xfs: strengthen log intent validation Darrick J. Wong
2020-12-01 3:38 ` [PATCH 09/10] xfs: validate feature support when recovering rmap/refcount/bmap intents Darrick J. Wong
2020-12-01 10:07 ` Christoph Hellwig
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