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[2003:dc:6f04:b700:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cee80eda4sm141003045e9.15.2026.09.04.03.33.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 03:33:54 -0700 (PDT) From: Max Kellermann To: idryomov@gmail.com, amarkuze@redhat.com, xiubo.li@clyso.com, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Max Kellermann , stable@vger.kernel.org Subject: [PATCH] ceph: avoid pending truncate during nonblocking cap acquire Date: Fri, 4 Sep 2026 12:33:51 +0200 Message-ID: <20260904103351.15357-1-max.kellermann@ionos.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Readahead acquires caps while the folios are locked. This can deadlock when processing a pending truncate; truncate_pagecache() can then attempt to a folio that is already locked. Return -EAGAIN instead when `NON_BLOCKING` is set, causing the readahead to be abandoned. Fixes: 49870056005c ("ceph: convert ceph_readpages to ceph_readahead") Cc: stable@vger.kernel.org Signed-off-by: Max Kellermann --- fs/ceph/caps.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index bcb04c6cb92c..86e195c5fd32 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2889,6 +2889,10 @@ static int try_get_cap_refs(struct inode *inode, int need, int want, } /* finish pending truncate */ + if (ci->i_truncate_pending && (flags & NON_BLOCKING)) { + ret = -EAGAIN; + goto out_unlock; + } while (ci->i_truncate_pending) { spin_unlock(&ci->i_ceph_lock); if (snap_rwsem_locked) { -- 2.47.3