From patchwork Fri Dec 13 14:36:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Foster X-Patchwork-Id: 13907258 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 58AFE1E0DD9 for ; Fri, 13 Dec 2024 14:34:29 +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=1734100471; cv=none; b=XBExnuXb0KlihjtDANgtbzyPt3b+gYBL8G4YN9f8Cv/rSjGZ3+i6dC00jTtEFzdyhSsL5ygCLyrj4pQArbCCTxQfwMS7V4ad8z4FbnOAg2cUW/6yC3OO6JQqGuSySYPDxG1DrWcn6EwzV6lG3yEKeGxwb4TB8Kn3E4bbyZtfsO8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734100471; c=relaxed/simple; bh=2bmrKHhqOpVWhf6RD9mPw9AxLKa0i/f5Bd0yrpSbJcU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ag5x4FpWnrPOHJdouxWqTtFfFyQe0nDzrHGLt7OmUyHpbR91MAvjzUIzHhlpLp6PzRa4clP3dBgxdresTqaw3avv38dd1lkeRvRmQqbdL0cArJ/RTslc1WczqvBTWRR391CfEycTNEG4loKQjhuTD1izKZ3lsY0qFgm7LKKK7ok= 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=bzp5M4Ai; 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="bzp5M4Ai" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1734100468; 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=ZxXfeI9zaN9MHchiaDhg4YyqSHugkBb7MViLt4OQWk8=; b=bzp5M4AisARq1ISGqcU/ncWtxBOAuPKZFV3bzklhgi6phCo7w9UckQ9pb/+DktrFgFIRlc vSA4zOHhzF/EqvvQdukdl42ZI/XorFWqd4IsX4I6vBaYFbvPjD1+21Unfw/vnNXeUfUtrp w+x3BGyeMtm5X7UfNiaErvKgmqKRWL8= Received: from mx-prod-mc-01.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-364-oQjTGvIFOMefS1F98dw7Iw-1; Fri, 13 Dec 2024 09:34:25 -0500 X-MC-Unique: oQjTGvIFOMefS1F98dw7Iw-1 X-Mimecast-MFC-AGG-ID: oQjTGvIFOMefS1F98dw7Iw 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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2FA201955F3E; Fri, 13 Dec 2024 14:34:24 +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 887AD195605A; Fri, 13 Dec 2024 14:34:23 +0000 (UTC) From: Brian Foster To: linux-fsdevel@vger.kernel.org Cc: linux-xfs@vger.kernel.org Subject: [PATCH 1/6] iomap: split out iomap check and reset logic from iter advance Date: Fri, 13 Dec 2024 09:36:05 -0500 Message-ID: <20241213143610.1002526-2-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 In preparation for more granular iomap_iter advancing, break out some of the logic associated with higher level iteration from iomap_advance_iter(). Specifically, factor the iomap reset code into a separate helper and lift the iomap.length check into the calling code, similar to how ->iomap_end() calls are handled. Signed-off-by: Brian Foster --- fs/iomap/iter.c | 49 ++++++++++++++++++++++++++----------------------- 1 file changed, 26 insertions(+), 23 deletions(-) diff --git a/fs/iomap/iter.c b/fs/iomap/iter.c index 3790918646af..731ea7267f27 100644 --- a/fs/iomap/iter.c +++ b/fs/iomap/iter.c @@ -7,6 +7,13 @@ #include #include "trace.h" +static inline void iomap_iter_reset_iomap(struct iomap_iter *iter) +{ + iter->processed = 0; + memset(&iter->iomap, 0, sizeof(iter->iomap)); + memset(&iter->srcmap, 0, sizeof(iter->srcmap)); +} + /* * Advance to the next range we need to map. * @@ -14,32 +21,24 @@ * processed - it was aborted because the extent the iomap spanned may have been * changed during the operation. In this case, the iteration behaviour is to * remap the unprocessed range of the iter, and that means we may need to remap - * even when we've made no progress (i.e. iter->processed = 0). Hence the - * "finished iterating" case needs to distinguish between - * (processed = 0) meaning we are done and (processed = 0 && stale) meaning we - * need to remap the entire remaining range. + * even when we've made no progress (i.e. count = 0). Hence the "finished + * iterating" case needs to distinguish between (count = 0) meaning we are done + * and (count = 0 && stale) meaning we need to remap the entire remaining range. */ -static inline int iomap_iter_advance(struct iomap_iter *iter) +static inline int iomap_iter_advance(struct iomap_iter *iter, s64 count) { 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 (WARN_ON_ONCE(iter->processed > iomap_length(iter))) - return -EIO; - iter->pos += iter->processed; - iter->len -= iter->processed; - if (!iter->len || (!iter->processed && !stale)) - ret = 0; - } + if (count < 0) + return count; + if (WARN_ON_ONCE(count > iomap_length(iter))) + return -EIO; + iter->pos += count; + iter->len -= count; + if (!iter->len || (!count && !stale)) + ret = 0; - /* clear the per iteration state */ - iter->processed = 0; - memset(&iter->iomap, 0, sizeof(iter->iomap)); - memset(&iter->srcmap, 0, sizeof(iter->srcmap)); return ret; } @@ -82,10 +81,14 @@ int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops) return ret; } + /* advance and clear state from the previous iteration */ trace_iomap_iter(iter, ops, _RET_IP_); - ret = iomap_iter_advance(iter); - if (ret <= 0) - return ret; + if (iter->iomap.length) { + ret = iomap_iter_advance(iter, iter->processed); + iomap_iter_reset_iomap(iter); + if (ret <= 0) + return ret; + } ret = ops->iomap_begin(iter->inode, iter->pos, iter->len, iter->flags, &iter->iomap, &iter->srcmap);