linux-ext4 - [PATCH 22/29] xfs: comment page allocation for nowait case in xfs_buf_find

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Message-Id: <20230825135431.1317785-23-hao.xu@linux.dev>
Date:   Fri, 25 Aug 2023 21:54:24 +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 22/29] xfs: comment page allocation for nowait case in xfs_buf_find_insert()

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

Add comments for page allocation in nowait case in xfs_buf_find_insert()

Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
 fs/xfs/xfs_buf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index eb3cd7702545..57bdc4c5dde1 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -633,6 +633,8 @@ xfs_buf_find_insert(
 	 * allocate the memory from the heap to minimise memory usage. If we
 	 * can't get heap memory for these small buffers, we fall back to using
 	 * the page allocator.
+	 * xfs_buf_alloc_kmem may return -EAGAIN, let's not return it but turn
+	 * to page allocator as well.
 	 */
 	if (BBTOB(new_bp->b_length) >= PAGE_SIZE ||
 	    xfs_buf_alloc_kmem(new_bp, flags) < 0) {
-- 
2.25.1