From patchwork Fri Nov 15 20:01:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Foster X-Patchwork-Id: 13876741 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D22541D8E12 for ; Fri, 15 Nov 2024 20:00:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731700831; cv=none; b=kZN7iYTyOlx8DZuJ5fHfepTDjKEMuSJMZazzqA2VMaZejk7TbaHWl9EUFQdO/V329SgS9Co/uXiXgTtRS2lbkBAaLrYAJx6iXfG4VeGkCA/rt37VggZBU9Np/pPyVc+4HQgynz458+7Tia7gUXyGMRgewPMBtUKIq+uKn61pDiE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731700831; c=relaxed/simple; bh=xCCcFj0TgUEtGfABdFQM0s73tU4M90qCrb6slEDmq4g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=PKqE1kM4QbkNt5MnR3eR21eS90gCtGDTo6KROB2ZnrM/PcLG3nmKGb6UjSyDGkLcZRAkIopT/u/s/EdSFr8pYz5+br8PMaRDjW1vdoFVQVSqZrBnEdfdo8q3EGGmXhAoo8qd6pppn3xUYPeZS//8ZknUCmZrO6n8syqLE2Yjdn0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=YqfT+QYm; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="YqfT+QYm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1731700829; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0RK0ZBTwC8BCQOlAHX4o6t4hLRunjrMolcycpNapl9Q=; b=YqfT+QYmtBeDAqa7vuRs9fBwmu+gDlSye0km4eEbkJwUqMBkRAVcpmJJsj/1V7nR/ryy/b X2M1WGk8g3hW0kvE1Rrs7ECLWSXNHDwuBJqIYguII2vvq9wRD0Swm73LoIZKcA1IhDGyfZ wa2GjkssZYV2BwXp7UxwrmMrFgU5VIY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-144-sMTN_FJBMaOq-mNP169SyQ-1; Fri, 15 Nov 2024 15:00:25 -0500 X-MC-Unique: sMTN_FJBMaOq-mNP169SyQ-1 X-Mimecast-MFC-AGG-ID: sMTN_FJBMaOq-mNP169SyQ Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 41D441955F42; Fri, 15 Nov 2024 20:00:24 +0000 (UTC) Received: from bfoster.redhat.com (unknown [10.22.80.120]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 547971953882; Fri, 15 Nov 2024 20:00:22 +0000 (UTC) From: Brian Foster To: linux-fsdevel@vger.kernel.org Cc: linux-xfs@vger.kernel.org, hch@infradead.org, djwong@kernel.org Subject: [PATCH v4 1/3] iomap: reset per-iter state on non-error iter advances Date: Fri, 15 Nov 2024 15:01:53 -0500 Message-ID: <20241115200155.593665-2-bfoster@redhat.com> In-Reply-To: <20241115200155.593665-1-bfoster@redhat.com> References: <20241115200155.593665-1-bfoster@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 iomap_iter_advance() zeroes the processed and mapping fields on every non-error iteration except for the last expected iteration (i.e. return 0 expected to terminate the iteration loop). This appears to be circumstantial as nothing currently relies on these fields after the final iteration. Therefore to better faciliate iomap_iter reuse in subsequent patches, update iomap_iter_advance() to always reset per-iteration state on successful completion. Signed-off-by: Brian Foster Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/iomap/iter.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/fs/iomap/iter.c b/fs/iomap/iter.c index 79a0614eaab7..3790918646af 100644 --- a/fs/iomap/iter.c +++ b/fs/iomap/iter.c @@ -22,26 +22,25 @@ static inline int iomap_iter_advance(struct iomap_iter *iter) { bool stale = iter->iomap.flags & IOMAP_F_STALE; + int ret = 1; /* handle the previous iteration (if any) */ if (iter->iomap.length) { if (iter->processed < 0) return iter->processed; - if (!iter->processed && !stale) - return 0; if (WARN_ON_ONCE(iter->processed > iomap_length(iter))) return -EIO; iter->pos += iter->processed; iter->len -= iter->processed; - if (!iter->len) - return 0; + if (!iter->len || (!iter->processed && !stale)) + ret = 0; } - /* clear the state for the next iteration */ + /* clear the per iteration state */ iter->processed = 0; memset(&iter->iomap, 0, sizeof(iter->iomap)); memset(&iter->srcmap, 0, sizeof(iter->srcmap)); - return 1; + return ret; } static inline void iomap_iter_done(struct iomap_iter *iter)