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[144.49.247.122]) by smtp-relay.gmail.com with ESMTPS id d9443c01a7336-241afb7035csm16542435ad.0.2025.08.10.22.40.29 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Aug 2025 22:40:30 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-qv1-f70.google.com with SMTP id 6a1803df08f44-70747c020daso82174596d6.0 for ; Sun, 10 Aug 2025 22:40:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1754890829; x=1755495629; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2AneEMvlSNWgSK1THzb8ZW0NUGNSj/nc53x2wpbcODQ=; b=KJM/Mtu2K2wv8Czxt6Rga/qj8jWDFpMUaDFEDl5lp444rYCQQ3n4vV3NMtsbEDRvLx 70O9jKMgjO3i9IzasmCAQTSfRvOaaK+YDnlwIbki/IQjDb7mPxgFSOHlYVFv7uIMXT1K RDfBlE044D0GoQoUSDy9ltAEece9S3v9dORuA= X-Forwarded-Encrypted: i=1; AJvYcCUKMZijBC8AW9CnEcKJ+4NwTwKAQMtiZgWPXtFfG5z8oPgdGbMWXB9gKJMNgDRPmrXC6OOg40kHyM0zMNM=@vger.kernel.org X-Received: by 2002:ad4:5d63:0:b0:6fa:abd2:f2bb with SMTP id 6a1803df08f44-7099b97d506mr154029646d6.8.1754890828582; Sun, 10 Aug 2025 22:40:28 -0700 (PDT) X-Received: by 2002:ad4:5d63:0:b0:6fa:abd2:f2bb with SMTP id 6a1803df08f44-7099b97d506mr154029446d6.8.1754890828047; Sun, 10 Aug 2025 22:40:28 -0700 (PDT) Received: from shivania.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-7077ce44849sm150544766d6.84.2025.08.10.22.40.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Aug 2025 22:40:27 -0700 (PDT) From: Shivani Agarwal To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, tapas.kundu@broadcom.com, agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, dm-devel@lists.linux.dev, Damien Le Moal , Hannes Reinecke , Himanshu Madhani , Mike Snitzer , Shivani Agarwal Subject: [PATCH 1/2 v5.10] dm: rearrange core declarations for extended use from dm-zone.c Date: Sun, 10 Aug 2025 22:27:01 -0700 Message-Id: <20250811052702.145189-2-shivani.agarwal@broadcom.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250811052702.145189-1-shivani.agarwal@broadcom.com> References: <20250811052702.145189-1-shivani.agarwal@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" From: Damien Le Moal commit e2118b3c3d94289852417f70ec128c25f4833aad upstream. Move the definitions of struct dm_target_io, struct dm_io and the bits of the flags field of struct mapped_device from dm.c to dm-core.h to make them usable from dm-zone.c. For the same reason, declare dec_pending() in dm-core.h after renaming it to dm_io_dec_pending(). And for symmetry of the function names, introduce the inline helper dm_io_inc_pending() instead of directly using atomic_inc() calls. Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Himanshu Madhani Signed-off-by: Mike Snitzer [Shivani: Modified to apply on 5.10.y] Signed-off-by: Shivani Agarwal --- drivers/md/dm-core.h | 52 ++++++++++++++++++++++++++++++++++++++ drivers/md/dm.c | 59 ++++++-------------------------------------- 2 files changed, 59 insertions(+), 52 deletions(-) diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h index ff73b2c17be5..99b2d2e2cf59 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -124,6 +124,19 @@ struct mapped_device { struct srcu_struct io_barrier; }; =20 +/* + * Bits for the flags field of struct mapped_device. + */ +#define DMF_BLOCK_IO_FOR_SUSPEND 0 +#define DMF_SUSPENDED 1 +#define DMF_FROZEN 2 +#define DMF_FREEING 3 +#define DMF_DELETING 4 +#define DMF_NOFLUSH_SUSPENDING 5 +#define DMF_DEFERRED_REMOVE 6 +#define DMF_SUSPENDED_INTERNALLY 7 +#define DMF_POST_SUSPENDING 8 + void disable_discard(struct mapped_device *md); void disable_write_same(struct mapped_device *md); void disable_write_zeroes(struct mapped_device *md); @@ -177,6 +190,45 @@ struct dm_table { struct dm_md_mempools *mempools; }; =20 +/* + * One of these is allocated per clone bio. + */ +#define DM_TIO_MAGIC 7282014 +struct dm_target_io { + unsigned int magic; + struct dm_io *io; + struct dm_target *ti; + unsigned int target_bio_nr; + unsigned int *len_ptr; + bool inside_dm_io; + struct bio clone; +}; + +/* + * One of these is allocated per original bio. + * It contains the first clone used for that original. + */ +#define DM_IO_MAGIC 5191977 +struct dm_io { + unsigned int magic; + struct mapped_device *md; + blk_status_t status; + atomic_t io_count; + struct bio *orig_bio; + unsigned long start_time; + spinlock_t endio_lock; + struct dm_stats_aux stats_aux; + /* last member of dm_target_io is 'struct bio' */ + struct dm_target_io tio; +}; + +static inline void dm_io_inc_pending(struct dm_io *io) +{ + atomic_inc(&io->io_count); +} + +void dm_io_dec_pending(struct dm_io *io, blk_status_t error); + static inline struct completion *dm_get_completion_from_kobject(struct kob= ject *kobj) { return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 4fdf0e666777..0868358a7a8d 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -73,38 +73,6 @@ struct clone_info { unsigned sector_count; }; =20 -/* - * One of these is allocated per clone bio. - */ -#define DM_TIO_MAGIC 7282014 -struct dm_target_io { - unsigned magic; - struct dm_io *io; - struct dm_target *ti; - unsigned target_bio_nr; - unsigned *len_ptr; - bool inside_dm_io; - struct bio clone; -}; - -/* - * One of these is allocated per original bio. - * It contains the first clone used for that original. - */ -#define DM_IO_MAGIC 5191977 -struct dm_io { - unsigned magic; - struct mapped_device *md; - blk_status_t status; - atomic_t io_count; - struct bio *orig_bio; - unsigned long start_time; - spinlock_t endio_lock; - struct dm_stats_aux stats_aux; - /* last member of dm_target_io is 'struct bio' */ - struct dm_target_io tio; -}; - void *dm_per_bio_data(struct bio *bio, size_t data_size) { struct dm_target_io *tio =3D container_of(bio, struct dm_target_io, clone= ); @@ -132,19 +100,6 @@ EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr); =20 #define MINOR_ALLOCED ((void *)-1) =20 -/* - * Bits for the md->flags field. - */ -#define DMF_BLOCK_IO_FOR_SUSPEND 0 -#define DMF_SUSPENDED 1 -#define DMF_FROZEN 2 -#define DMF_FREEING 3 -#define DMF_DELETING 4 -#define DMF_NOFLUSH_SUSPENDING 5 -#define DMF_DEFERRED_REMOVE 6 -#define DMF_SUSPENDED_INTERNALLY 7 -#define DMF_POST_SUSPENDING 8 - #define DM_NUMA_NODE NUMA_NO_NODE static int dm_numa_node =3D DM_NUMA_NODE; =20 @@ -897,7 +852,7 @@ static int __noflush_suspending(struct mapped_device *m= d) * Decrements the number of outstanding ios that a bio has been * cloned into, completing the original io if necc. */ -static void dec_pending(struct dm_io *io, blk_status_t error) +void dm_io_dec_pending(struct dm_io *io, blk_status_t error) { unsigned long flags; blk_status_t io_error; @@ -1041,7 +996,7 @@ static void clone_endio(struct bio *bio) } =20 free_tio(tio); - dec_pending(io, error); + dm_io_dec_pending(io, error); } =20 /* @@ -1309,7 +1264,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio) * anything, the target has assumed ownership of * this io. */ - atomic_inc(&io->io_count); + dm_io_inc_pending(io); sector =3D clone->bi_iter.bi_sector; =20 if (unlikely(swap_bios_limit(ti, clone))) { @@ -1336,7 +1291,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio) up(&md->swap_bios_semaphore); } free_tio(tio); - dec_pending(io, BLK_STS_IOERR); + dm_io_dec_pending(io, BLK_STS_IOERR); break; case DM_MAPIO_REQUEUE: if (unlikely(swap_bios_limit(ti, clone))) { @@ -1344,7 +1299,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio) up(&md->swap_bios_semaphore); } free_tio(tio); - dec_pending(io, BLK_STS_DM_REQUEUE); + dm_io_dec_pending(io, BLK_STS_DM_REQUEUE); break; default: DMWARN("unimplemented target map return value: %d", r); @@ -1640,7 +1595,7 @@ static blk_qc_t __split_and_process_bio(struct mapped= _device *md, =20 if (bio->bi_opf & REQ_PREFLUSH) { error =3D __send_empty_flush(&ci); 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[144.49.247.119]) by smtp-relay.gmail.com with ESMTPS id 00721157ae682-71b5a8619aesm13560047b3.51.2025.08.10.22.40.32 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Aug 2025 22:40:32 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-qv1-f69.google.com with SMTP id 6a1803df08f44-70739ef4ab4so92214926d6.0 for ; Sun, 10 Aug 2025 22:40:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1754890832; x=1755495632; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=fpH6x8rZ+rgBdQ7TOKJbwRYB5Ad7cxy49v5qCgwdE24=; b=D1IIZlpQlus+l+dkaXItyCYWU4aOG5witaWtn0qdbzAZmqBF5bXnJZXtIXeDrEJUln /eNVk52WFqZeuDPafJYoPyzToqre8Pyhmmpq5CL5eEAxNDa0PowMyYr9WWkCQzljWr7I oWsFQ/Xi0wyAD/ZG9Q0CCrWim58Iw1kc3Ykl8= X-Forwarded-Encrypted: i=1; AJvYcCXtpD8xa1icrtNtXU36o3cV1IVc8AKe+rb3yMCHIs6iWh21BE8u49ukpnYC7duABacvhMMDAjJwYhSRQA8=@vger.kernel.org X-Received: by 2002:ad4:5d63:0:b0:6fa:abd2:f2bb with SMTP id 6a1803df08f44-7099b97d506mr154030656d6.8.1754890831936; Sun, 10 Aug 2025 22:40:31 -0700 (PDT) X-Received: by 2002:ad4:5d63:0:b0:6fa:abd2:f2bb with SMTP id 6a1803df08f44-7099b97d506mr154030466d6.8.1754890831489; Sun, 10 Aug 2025 22:40:31 -0700 (PDT) Received: from shivania.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-7077ce44849sm150544766d6.84.2025.08.10.22.40.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Aug 2025 22:40:31 -0700 (PDT) From: Shivani Agarwal To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, tapas.kundu@broadcom.com, agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, dm-devel@lists.linux.dev, Ming Lei , Mike Snitzer , Shivani Agarwal Subject: [PATCH 2/2 v5.10] dm rq: don't queue request to blk-mq during DM suspend Date: Sun, 10 Aug 2025 22:27:02 -0700 Message-Id: <20250811052702.145189-3-shivani.agarwal@broadcom.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250811052702.145189-1-shivani.agarwal@broadcom.com> References: <20250811052702.145189-1-shivani.agarwal@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" From: Ming Lei commit b4459b11e84092658fa195a2587aff3b9637f0e7 upstream. DM uses blk-mq's quiesce/unquiesce to stop/start device mapper queue. But blk-mq's unquiesce may come from outside events, such as elevator switch, updating nr_requests or others, and request may come during suspend, so simply ask for blk-mq to requeue it. Fixes one kernel panic issue when running updating nr_requests and dm-mpath suspend/resume stress test. Cc: stable@vger.kernel.org Signed-off-by: Ming Lei Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman [Shivani: Modified to apply on 5.10.y] Signed-off-by: Shivani Agarwal --- drivers/md/dm-rq.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 7762bde40963..a6ea77432e34 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -490,6 +490,14 @@ static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ct= x *hctx, struct mapped_device *md =3D tio->md; struct dm_target *ti =3D md->immutable_target; =20 + /* + * blk-mq's unquiesce may come from outside events, such as + * elevator switch, updating nr_requests or others, and request may + * come during suspend, so simply ask for blk-mq to requeue it. + */ + if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) + return BLK_STS_RESOURCE; + if (unlikely(!ti)) { int srcu_idx; struct dm_table *map; --=20 2.40.4