From patchwork Fri Dec 13 14:36:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Foster X-Patchwork-Id: 13907264 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 0FBBE1E2307 for ; Fri, 13 Dec 2024 14:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734100474; cv=none; b=g5h2qNHG7TM2yYSq0iRtQLct3jweXC02I0FLv5gTYiE9NzojypGc2bsbQgWibsUmKqZR9WHukoFtu3KkpWXI9UvPznsVTgwNlOHRQGMhTbK3k62QtEAycm7qdV8sTzssgXmYxUGIb7sCP5+YhiYeBtB+Pj4RNYSu/kjou0oPC0w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734100474; c=relaxed/simple; bh=VpcK74VQzHYA+NX8kvw5noZ7DBJzXn4eXuf/FfV4zJI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=p9UEN3zptjeF9QlUbJHpw0kFPwe8pzZQXh/JFMnT2jo+PziVnqIKi+qidhOJItzkILnxO9OOetQDZLZxVVaFKEdcPFUKT8feC+DWZp3YcyMJp885DRXsslfRvbsbFRW3h+ykmqTVep5s2/emo4pfw4Mb+kVH3DO7Rs/TgWIwaRA= 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=gL0KiBKu; arc=none smtp.client-ip=170.10.129.124 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="gL0KiBKu" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1734100472; 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=KYhRuj26be0LS/4XAkGR4xpbIjWtWXYTpjNftN6/7K0=; b=gL0KiBKu2+pwN3wbaykLRvYDv1HXu6HD+x+pVBF3PxR58jIdq5CS7cjC+x5LsTuoW1hU7Q ExbTFNVKY9d1hg9IJnDV/szRgzVsFOLPoOjrIfV4l/8YMO69yT0vywQpsZPKNEzb91jNwq UDrySNj+3m5jUgbcH6qzWvqcLjuU3VA= Received: from mx-prod-mc-02.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-75-nNyB6c4iNe2IvCPYuIqexQ-1; Fri, 13 Dec 2024 09:34:28 -0500 X-MC-Unique: nNyB6c4iNe2IvCPYuIqexQ-1 X-Mimecast-MFC-AGG-ID: nNyB6c4iNe2IvCPYuIqexQ Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C55BA1956054; Fri, 13 Dec 2024 14:34:27 +0000 (UTC) Received: from bfoster.redhat.com (unknown [10.22.90.12]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2DE99195605A; Fri, 13 Dec 2024 14:34:27 +0000 (UTC) From: Brian Foster To: linux-fsdevel@vger.kernel.org Cc: linux-xfs@vger.kernel.org Subject: [PATCH 5/6] iomap: advance the iter directly on unshare range Date: Fri, 13 Dec 2024 09:36:09 -0500 Message-ID: <20241213143610.1002526-6-bfoster@redhat.com> In-Reply-To: <20241213143610.1002526-1-bfoster@redhat.com> References: <20241213143610.1002526-1-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 10.30.177.40 Modify unshare range to advance the iter directly. Replace the local pos and length calculations with direct advances and loop based on iter state instead. Signed-off-by: Brian Foster --- fs/iomap/buffered-io.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 3ece0bee803d..5e33e52eff15 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1268,18 +1268,16 @@ EXPORT_SYMBOL_GPL(iomap_write_delalloc_release); static loff_t iomap_unshare_iter(struct iomap_iter *iter) { struct iomap *iomap = &iter->iomap; - loff_t pos = iter->pos; - loff_t length = iomap_length(iter); - loff_t written = 0; if (!iomap_want_unshare_iter(iter)) - return length; + return iomap_length(iter); do { struct folio *folio; int status; size_t offset; - size_t bytes = min_t(u64, SIZE_MAX, length); + size_t bytes = min_t(u64, SIZE_MAX, iomap_length(iter)); + loff_t pos = iter->pos; bool ret; status = iomap_write_begin(iter, pos, bytes, &folio); @@ -1299,14 +1297,12 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter) cond_resched(); - pos += bytes; - written += bytes; - length -= bytes; + iomap_iter_advance(iter, bytes); balance_dirty_pages_ratelimited(iter->inode->i_mapping); - } while (length > 0); + } while (iomap_length(iter) > 0); - return written; + return 0; } int