From: "Darrick J. Wong" <djwong@kernel.org>
To: sandeen@sandeen.net, djwong@kernel.org
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH 39/43] libxfs: always initialize internal buffer map
Date: Mon, 13 Sep 2021 19:43:33 -0700 [thread overview]
Message-ID: <163158741330.1604118.2384362360060613446.stgit@magnolia> (raw)
In-Reply-To: <163158719952.1604118.14415288328687941574.stgit@magnolia>
From: Darrick J. Wong <djwong@kernel.org>
The __initbuf function is responsible for initializing the fields of an
xfs_buf. Buffers are always required to have a mapping, though in the
typical case there's only one mapping, so we can use the internal one.
The single-mapping b_maps init code at the end of the function doesn't
quite get this right though -- if a single-mapping buffer in the cache
was allowed to expire and now is being repurposed, it'll come out with
b_maps == &__b_map, in which case we incorrectly skip initializing the
map. This has gone unnoticed until now because (AFAICT) the code paths
that use b_maps are the same ones that are called with multi-mapping
buffers, which are initialized correctly.
Anyway, the improperly initialized single-mappings will cause problems
in upcoming patches where we turn b_bn into the cache key and require
the use of b_maps[0].bm_bn for the buffer LBA. Fix this.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
libxfs/rdwr.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index f4e76029..03dc2917 100644
--- a/libxfs/rdwr.c
+++ b/libxfs/rdwr.c
@@ -251,9 +251,11 @@ __initbuf(struct xfs_buf *bp, struct xfs_buftarg *btp, xfs_daddr_t bno,
bp->b_ops = NULL;
INIT_LIST_HEAD(&bp->b_li_list);
- if (!bp->b_maps) {
- bp->b_nmaps = 1;
+ if (!bp->b_maps)
bp->b_maps = &bp->__b_map;
+
+ if (bp->b_maps == &bp->__b_map) {
+ bp->b_nmaps = 1;
bp->b_maps[0].bm_bn = bp->b_bn;
bp->b_maps[0].bm_len = bp->b_length;
}
next prev parent reply other threads:[~2021-09-14 2:43 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 2:39 [PATCHSET 00/43] xfs: sync libxfs with 5.15 Darrick J. Wong
2021-09-14 2:40 ` [PATCH 01/43] xfs_{copy,db,logprint,repair}: pass xfs_mount pointers instead of xfs_sb pointers Darrick J. Wong
2021-09-14 2:40 ` [PATCH 02/43] xfs: remove support for disabling quota accounting on a mounted file system Darrick J. Wong
2021-09-14 2:40 ` [PATCH 03/43] xfs: remove the active vs running quota differentiation Darrick J. Wong
2021-09-14 2:40 ` [PATCH 04/43] xfs: replace kmem_alloc_large() with kvmalloc() Darrick J. Wong
2021-09-14 2:40 ` [PATCH 05/43] xfs: allow setting and clearing of log incompat feature flags Darrick J. Wong
2021-09-14 2:40 ` [PATCH 06/43] xfs: add attr state machine tracepoints Darrick J. Wong
2021-09-14 2:40 ` [PATCH 07/43] xfs: Rename __xfs_attr_rmtval_remove Darrick J. Wong
2021-09-14 2:40 ` [PATCH 08/43] xfs: make xfs_rtalloc_query_range input parameters const Darrick J. Wong
2021-09-14 2:40 ` [PATCH 09/43] xfs: make the key parameters to all btree key comparison functions const Darrick J. Wong
2021-09-14 2:40 ` [PATCH 10/43] xfs: make the key parameters to all btree query range " Darrick J. Wong
2021-09-14 2:41 ` [PATCH 11/43] xfs: make the record pointer passed to query_range " Darrick J. Wong
2021-09-14 2:41 ` [PATCH 12/43] xfs: mark the record passed into btree init_key functions as const Darrick J. Wong
2021-09-14 2:41 ` [PATCH 13/43] xfs: make the keys and records passed to btree inorder functions const Darrick J. Wong
2021-09-14 2:41 ` [PATCH 14/43] xfs: mark the record passed into xchk_btree functions as const Darrick J. Wong
2021-09-14 2:41 ` [PATCH 15/43] xfs: make the pointer passed to btree set_root functions const Darrick J. Wong
2021-09-14 2:41 ` [PATCH 16/43] xfs: make the start pointer passed to btree alloc_block " Darrick J. Wong
2021-09-14 2:41 ` [PATCH 17/43] xfs: make the start pointer passed to btree update_lastrec " Darrick J. Wong
2021-09-14 2:41 ` [PATCH 18/43] xfs: constify btree function parameters that are not modified Darrick J. Wong
2021-09-14 2:41 ` [PATCH 19/43] xfs: resolve fork names in trace output Darrick J. Wong
2021-09-14 2:41 ` [PATCH 20/43] xfs: sb verifier doesn't handle uncached sb buffer Darrick J. Wong
2021-09-14 2:41 ` [PATCH 21/43] xfs: rename xfs_has_attr() Darrick J. Wong
2021-09-14 2:42 ` [PATCH 22/43] xfs: rework attr2 feature and mount options Darrick J. Wong
2021-09-14 2:42 ` [PATCH 23/43] xfs: reflect sb features in xfs_mount Darrick J. Wong
2021-09-14 2:42 ` [PATCH 24/43] xfs: replace xfs_sb_version checks with feature flag checks Darrick J. Wong
2021-09-14 2:42 ` [PATCH 25/43] xfs: convert mount flags to features Darrick J. Wong
2021-09-14 2:42 ` [PATCH 26/43] xfs: convert remaining mount flags to state flags Darrick J. Wong
2021-09-14 2:42 ` [PATCH 27/43] xfs: replace XFS_FORCED_SHUTDOWN with xfs_is_shutdown Darrick J. Wong
2021-09-14 2:42 ` [PATCH 28/43] xfs: convert xfs_fs_geometry to use mount feature checks Darrick J. Wong
2021-09-14 2:42 ` [PATCH 29/43] xfs: open code sb verifier " Darrick J. Wong
2021-09-14 2:42 ` [PATCH 30/43] xfs: convert xfs_sb_version_has checks to use mount features Darrick J. Wong
2021-09-14 2:42 ` [PATCH 31/43] libxlog: replace xfs_sb_version checks with feature flag checks Darrick J. Wong
2021-09-14 2:42 ` [PATCH 32/43] libxfs: " Darrick J. Wong
2021-09-14 2:43 ` [PATCH 33/43] xfs_{copy,db,logprint,repair}: " Darrick J. Wong
2021-09-14 2:43 ` [PATCH 34/43] xfs: remove unused xfs_sb_version_has wrappers Darrick J. Wong
2021-09-14 2:43 ` [PATCH 35/43] xfs: introduce xfs_sb_is_v5 helper Darrick J. Wong
2021-09-14 2:43 ` [PATCH 36/43] xfs: kill xfs_sb_version_has_v3inode() Darrick J. Wong
2021-09-14 2:43 ` [PATCH 37/43] libxfs: use opstate flags and functions for libxfs mount options Darrick J. Wong
2021-09-14 2:43 ` [PATCH 38/43] libxfs: remove pointless *XFS_MOUNT* flags Darrick J. Wong
2021-09-14 2:43 ` Darrick J. Wong [this message]
2021-09-14 2:43 ` [PATCH 40/43] libxfs: replace XFS_BUF_SET_ADDR with a function Darrick J. Wong
2021-09-14 2:43 ` [PATCH 41/43] xfs: introduce xfs_buf_daddr() Darrick J. Wong
2021-09-14 2:43 ` [PATCH 42/43] xfs: convert bp->b_bn references to xfs_buf_daddr() Darrick J. Wong
2021-09-14 2:43 ` [PATCH 43/43] libxfs: rename buffer cache index variable b_bn Darrick J. Wong
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