linux-kernel - [PATCH 19/29] xfs: support nowait memory allocation in _xfs_buf

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Message-Id: <20230825135431.1317785-20-hao.xu@linux.dev>
Date:   Fri, 25 Aug 2023 21:54:21 +0800
From:   Hao Xu <hao.xu@...ux.dev>
To:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
        ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
        devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
        Wanpeng Li <wanpengli@...cent.com>
Subject: [PATCH 19/29] xfs: support nowait memory allocation in _xfs_buf_alloc()

From: Hao Xu <howeyxu@...cent.com>

Choose different gfp flags to support nowait memory allocation in
_xfs_buf_alloc().

Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
 fs/xfs/xfs_buf.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 9f84bc3b802c..8b800ce28996 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -220,9 +220,14 @@ _xfs_buf_alloc(
 	struct xfs_buf		*bp;
 	int			error;
 	int			i;
+	bool			nowait = flags & XBF_NOWAIT;
+	gfp_t			gfp_flags = GFP_NOFS |
+					    (nowait ? 0 : __GFP_NOFAIL);
 
 	*bpp = NULL;
-	bp = kmem_cache_zalloc(xfs_buf_cache, GFP_NOFS | __GFP_NOFAIL);
+	bp = kmem_cache_zalloc(xfs_buf_cache, gfp_flags);
+	if (!bp)
+		return -EAGAIN;
 
 	/*
 	 * We don't want certain flags to appear in b_flags unless they are
-- 
2.25.1