linux-kernel - [PATCH 14/15] xfs: punt uncached write completions to the completion wq

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Message-ID: <20241110152906.1747545-15-axboe@kernel.dk>
Date: Sun, 10 Nov 2024 08:28:06 -0700
From: Jens Axboe <axboe@...nel.dk>
To: linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Cc: hannes@...xchg.org,
	clm@...a.com,
	linux-kernel@...r.kernel.org,
	willy@...radead.org,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 14/15] xfs: punt uncached write completions to the completion wq

They need non-irq context guaranteed, to be able to prune ranges from
the page cache. Treat them like unwritten extents and punt them to the
completion workqueue.

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 fs/xfs/xfs_aops.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 559a3a577097..c86fc2b8f344 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -416,9 +416,12 @@ xfs_prepare_ioend(
 
 	memalloc_nofs_restore(nofs_flag);
 
-	/* send ioends that might require a transaction to the completion wq */
+	/*
+	 * Send ioends that might require a transaction or need blocking
+	 * context to the completion wq
+	 */
 	if (xfs_ioend_is_append(ioend) || ioend->io_type == IOMAP_UNWRITTEN ||
-	    (ioend->io_flags & IOMAP_F_SHARED))
+	    (ioend->io_flags & (IOMAP_F_SHARED|IOMAP_F_UNCACHED)))
 		ioend->io_bio.bi_end_io = xfs_end_bio;
 	return status;
 }
-- 
2.45.2