From: Sam Edwards Date: Wed, 31 Dec 2025 04:05:06 +0000 (-0800) Subject: libceph: reset sparse-read state in osd_fault() X-Git-Tag: v6.19-rc5~18^2~1 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=11194b416ef95012c2cfe5f546d71af07b639e93;p=thirdparty%2Fkernel%2Flinux.git libceph: reset sparse-read state in osd_fault() When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state. Cc: stable@vger.kernel.org Fixes: f628d7999727 ("libceph: add sparse read support to OSD client") Signed-off-by: Sam Edwards Reviewed-by: Ilya Dryomov Signed-off-by: Ilya Dryomov --- diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 3667319b949d..1a7be2f615dc 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -4281,6 +4281,9 @@ static void osd_fault(struct ceph_connection *con) goto out_unlock; } + osd->o_sparse_op_idx = -1; + ceph_init_sparse_read(&osd->o_sparse_read); + if (!reopen_osd(osd)) kick_osd_requests(osd); maybe_request_map(osdc);