Commit bbec3ef4 authored Oct 26, 2020 by Darrick J. Wong Committed by Greg Kroah-Hartman Nov 18, 2020

xfs: set xefi_discard when creating a deferred agfl free log intent item



[ Upstream commit 2c334e12f957cd8c6bb66b4aa3f79848b7c33cab ]

Make sure that we actually initialize xefi_discard when we're scheduling
a deferred free of an AGFL block.  This was (eventually) found by the
UBSAN while I was banging on realtime rmap problems, but it exists in
the upstream codebase.  While we're at it, rearrange the structure to
reduce the struct size from 64 to 56 bytes.

Fixes: fcb762f5 ("xfs: add bmapi nodiscard flag")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 243a1646

fs/xfs/libxfs/xfs_alloc.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2213,6 +2213,7 @@ xfs_defer_agfl_block(
		new->xefi_startblock = XFS_AGB_TO_FSB(mp, agno, agbno);
		new->xefi_blockcount = 1;
		new->xefi_oinfo = *oinfo;
		new->xefi_skip_discard = false;

		trace_xfs_agfl_free_defer(mp, agno, 0, agbno, 1);

fs/xfs/libxfs/xfs_bmap.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -52,9 +52,9 @@ struct xfs_extent_free_item
		{
		xfs_fsblock_t xefi_startblock;/* starting fs block number */
		xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
		bool xefi_skip_discard;
		struct list_head xefi_list;
		struct xfs_owner_info xefi_oinfo; /* extent owner */
		bool xefi_skip_discard;
		};

		#define XFS_BMAP_MAX_NMAP 4