From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A10B606D823 for ; Sun, 8 Nov 2026 20:48:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=s7mpo6TY; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=JjiJO6ka DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=uqE0xY48+HsHwpb4Up8/gX/8HzxQ6Bp9ud6iT5itTcM=; b=s7mpo6TYq7JPYD YGEBmbwA4QW2bf5pyf4p1p9rMKWI0g8FroFNXpAex+2vNh1XDACe7GgekZZjAU2eTXZQrsVrL+wCk h3pjEXibXssep2WOuCToLCGZjfCA0+cz2ePox+HU4j1nV9AvBdfBSR/s2m0GQPQSkEBIon3y7ieUK En++VxIdgKZXX2Em7NY8zgvRYDzrvjb10QvH4UhJNL3IAXYf879Jf1FfbqcEmoC/Raqt43Ob4zgvr WVb3JoaumBYjOPfJiPGagVrJ5gTW2Efg94TlyOY03NVgWz7csjD39RzTOhgDhcAL6hHuRCJTL31NW D01fSOq+x0dk77mBG4Cw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQ9oB-0000000Gbyt-2pB2; Sun, 08 Nov 2026 20:48:11 +0000 Received: from out-71.mta1.migadu.com ([95.215.58.71] helo=mta1.migadu.com) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQ9o8-0000000GbqD-2Rgu for linux-nvme@lists.infradead.org; Sun, 08 Nov 2026 20:48:09 +0000 X-Envelope-To: linux-nvme@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=php3BuRcqSzcvJXynpfSwkuXZS0RYrDjb3XQI6eXRsI=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794170886; v=1; x=1794775686; b=JjiJO6kasC6K0F3iRyMHWzHqGS8ubgukvZFkg24iUpWnsgVKBItGMrgXtnWCSEK+ILQ1YLC3 x67Wskq0VgGbATeo0eH+YnbXYWk2W+hc+HgfYh684KtkR7gKbfJ6kXyfGqL7hRC2bcMQL9XkcO9 Cd2H8ppT8TqPs/wGnq+8hQuI= X-Envelope-To: linux-nvme@lists.infradead.org Received: by mta10.migadu.com with ESMTPS id f0abbd2653e1c286; Sun, 08 Nov 2026 20:48:06 +0000 X-Mizu-Trace-ID: f0abbd2653e1c286 X-Migadu-Flow: FLOW_OUT From: John Garry To: james.bottomley@hansenpartnership.com, mkp@kernel.org Cc: hare@suse.com, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, snitzer@kernel.org, jmeneghi@redhat.com, bmarzins@redhat.com, dm-devel@lists.linux.dev, hch@lst.de, michael.christie@oracle.com, John Garry Subject: [PATCH v9 11/29] libmultipath: Add mpath_bdev_get_unique_id() Date: Sun, 8 Nov 2026 20:47:15 +0000 Message-ID: <20261108204733.557995-12-john.garry@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261108204733.557995-1-john.garry@linux.dev> References: <20261108204733.557995-1-john.garry@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261108_124808_785492_A5AA1B47 X-CRM114-Status: GOOD ( 10.82 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Add mpath_bdev_get_unique_id() as a multipath block device .get_unique_id handler. Signed-off-by: John Garry --- lib/multipath.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/lib/multipath.c b/lib/multipath.c index 3e2dc7d8b2c2..b03080afb259 100644 --- a/lib/multipath.c +++ b/lib/multipath.c @@ -455,6 +455,27 @@ static void mpath_bdev_release(struct gendisk *disk) mpath_put_head(mpath_head); } +static int mpath_bdev_get_unique_id(struct gendisk *disk, u8 id[16], + enum blk_unique_id type) +{ + struct mpath_head *mpath_head = mpath_gendisk_to_head(disk); + int srcu_idx, ret = -EWOULDBLOCK; + struct mpath_device *mpath_device; + + srcu_idx = srcu_read_lock(&mpath_head->srcu); + mpath_device = mpath_find_path(mpath_head); + if (mpath_device) { + if (mpath_device->disk->fops->get_unique_id) + ret = mpath_device->disk->fops->get_unique_id( + mpath_device->disk, id, type); + else + ret = 0; /* referencing __dm_get_unique_id() */ + } + srcu_read_unlock(&mpath_head->srcu, srcu_idx); + + return ret; +} + static int mpath_bdev_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg) { @@ -522,6 +543,7 @@ const struct block_device_operations mpath_ops = { * avoid their custom compat_ioctl implementation. */ .compat_ioctl = blkdev_compat_ptr_ioctl, + .get_unique_id = mpath_bdev_get_unique_id, .getgeo = mpath_bdev_getgeo, }; EXPORT_SYMBOL_GPL(mpath_ops); -- 2.43.0