This is a note to let you know that I've just added the patch titled
xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xfs-set-firstfsb-to-nullfsblock-before-feeding-it-to-_bmapi_write.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From hch@xxxxxx Mon Sep 18 10:08:30 2017
From: Christoph Hellwig <hch@xxxxxx>
Date: Sun, 17 Sep 2017 14:06:37 -0700
Subject: xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
To: stable@xxxxxxxxxxxxxxx
Cc: linux-xfs@xxxxxxxxxxxxxxx, "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Message-ID: <20170917210712.10804-13-hch@xxxxxx>
From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
commit 4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 upstream.
We must initialize the firstfsb parameter to _bmapi_write so that it
doesn't incorrectly treat stack garbage as a restriction on which AGs
it can search for free space.
Fixes-coverity-id: 1402025
Fixes-coverity-id: 1415167
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/xfs/libxfs/xfs_bmap.c | 9 +++++++++
fs/xfs/xfs_reflink.c | 2 +-
2 files changed, 10 insertions(+), 1 deletion(-)
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -6639,6 +6639,15 @@ xfs_bmap_finish_one(
bmap.br_blockcount = *blockcount;
bmap.br_state = state;
+ /*
+ * firstfsb is tied to the transaction lifetime and is used to
+ * ensure correct AG locking order and schedule work item
+ * continuations. XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us
+ * to only making one bmap call per transaction, so it should
+ * be safe to have it as a local variable here.
+ */
+ firstfsb = NULLFSBLOCK;
+
trace_xfs_bmap_deferred(tp->t_mountp,
XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -333,7 +333,7 @@ xfs_reflink_convert_cow_extent(
struct xfs_defer_ops *dfops)
{
struct xfs_bmbt_irec irec = *imap;
- xfs_fsblock_t first_block;
+ xfs_fsblock_t first_block = NULLFSBLOCK;
int nimaps = 1;
if (imap->br_state == XFS_EXT_NORM)
Patches currently in stable-queue which might be from hch@xxxxxx are
queue-4.9/xfs-fix-inobt-inode-allocation-search-optimization.patch
queue-4.9/xfs-try-to-avoid-blowing-out-the-transaction-reservation-when-bunmaping-a-shared-extent.patch
queue-4.9/xfs-free-cowblocks-and-retry-on-buffered-write-enospc.patch
queue-4.9/xfs-set-firstfsb-to-nullfsblock-before-feeding-it-to-_bmapi_write.patch
queue-4.9/xfs-fix-quotacheck-dquot-id-overflow-infinite-loop.patch
queue-4.9/xfs-remove-bli-from-ail-before-release-on-transaction-abort.patch
queue-4.9/xfs-check-_btree_check_block-value.patch
queue-4.9/xfs-don-t-allow-bmap-on-rt-files.patch
queue-4.9/xfs-free-uncommitted-transactions-during-log-recovery.patch
queue-4.9/xfs-don-t-crash-on-unexpected-holes-in-dir-attr-btrees.patch
queue-4.9/xfs-fix-spurious-spin_is_locked-assert-failures-on-non-smp-kernels.patch
queue-4.9/xfs-fix-per-inode-dax-flag-inheritance.patch
queue-4.9/xfs-fix-multi-ag-deadlock-in-xfs_bunmapi.patch
queue-4.9/xfs-release-bli-from-transaction-properly-on-fs-shutdown.patch
queue-4.9/xfs-check-_alloc_read_agf-buffer-pointer-before-using.patch