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[87.205.122.125]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c31a9a74bd7sm261422066b.37.2026.10.10.09.16.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Oct 2026 09:16:15 -0700 (PDT) From: illofspeed To: dm-devel@lists.linux.dev Cc: agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, bmarzins@redhat.com, hare@suse.de, dlemoal@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] dm zoned: back off when reclaim finds no destination zone Date: Sat, 10 Oct 2026 18:16:11 +0200 Message-ID: <20261010161613.396-2-illofspeed@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261010161613.396-1-illofspeed@gmail.com> References: <20261010161613.396-1-illofspeed@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When dmz_do_reclaim() fails with -ENOSPC because no free zone is available to copy the data into, dmz_reclaim_work() still ends with dmz_schedule_reclaim(). If the target is idle, dmz_should_reclaim() keeps returning true, the work is queued again with no delay and the worker spins on the same failing pass. Re-arm the idle poll instead, so that reclaim is retried after DMZ_IDLE_PERIOD. The next patch makes -ENOSPC the expected result when an idle target has random zones but no free sequential zone. Tested on a 7.2.6 kernel as an out-of-tree dm-zoned module, together with the next two patches, on emulated host-managed drives (tcmu-runner ZBC handler) and on three 27 TB host-managed drives used as md RAID5 members. Assisted-by: LLM Signed-off-by: illofspeed --- drivers/md/dm-zoned-reclaim.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c index c041413c729..315f0da99f3 100644 --- a/drivers/md/dm-zoned-reclaim.c +++ b/drivers/md/dm-zoned-reclaim.c @@ -540,6 +540,14 @@ static void dmz_reclaim_work(struct work_struct *work) if (ret && ret != -EINTR) { if (!dmz_check_dev(zmd)) return; + if (ret == -ENOSPC) { + /* + * No zone to copy into: nothing can progress now. + * Rescheduling immediately would spin; poll instead. + */ + mod_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD); + return; + } } dmz_schedule_reclaim(zrc); -- 2.43.0