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From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <djwong@kernel.org>, <hch@lst.de>, <linux-xfs@vger.kernel.org>
Cc: <ruansy.fnst@fujitsu.com>, <dan.j.williams@intel.com>,
	<david@fromorbit.com>, <linux-fsdevel@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <nvdimm@lists.linux.dev>,
	<rgoldwyn@suse.de>, <viro@zeniv.linux.org.uk>,
	<willy@infradead.org>
Subject: [PATCH v7 5/8] iomap: Introduce iomap_iter2 for two files
Date: Mon, 16 Aug 2021 14:03:56 +0800	[thread overview]
Message-ID: <20210816060359.1442450-6-ruansy.fnst@fujitsu.com> (raw)
In-Reply-To: <20210816060359.1442450-1-ruansy.fnst@fujitsu.com>

Some operations, such as comparing a range of data in two files under
fsdax mode, requires nested iomap_begin()/iomap_end() on two files.
Thus, we introduce iomap_iter2() to accept two iteraters to operate
action on two files.

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
 fs/iomap/core.c       | 51 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/iomap.h |  2 ++
 2 files changed, 53 insertions(+)

diff --git a/fs/iomap/core.c b/fs/iomap/core.c
index 89a87a1654e8..214538a25110 100644
--- a/fs/iomap/core.c
+++ b/fs/iomap/core.c
@@ -77,3 +77,54 @@ int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops)
 	iomap_iter_done(iter);
 	return 1;
 }
+
+/**
+ * iomap_iter2 - iterate over a ranges in two files
+ * @iter1:  the first iteration structure
+ * @iter2: the second iteration structure
+ * @ops:   iomap ops provided by the file system
+ *
+ * Iterate two files once.
+ */
+int iomap_iter2(struct iomap_iter *iter1, struct iomap_iter *iter2,
+		const struct iomap_ops *ops)
+{
+	int ret;
+
+	if (iter2->iomap.length && ops->iomap_end) {
+		ret = ops->iomap_end(iter2->inode, iter2->pos, iomap_length(iter2),
+				iter2->processed > 0 ? iter2->processed : 0,
+				iter2->flags, &iter2->iomap);
+		if (ret < 0 && !iter2->processed)
+			return ret;
+	}
+
+	if (iter1->iomap.length && ops->iomap_end) {
+		ret = ops->iomap_end(iter1->inode, iter1->pos, iomap_length(iter1),
+				iter1->processed > 0 ? iter1->processed : 0,
+				iter1->flags, &iter1->iomap);
+		if (ret < 0 && !iter1->processed)
+			return ret;
+	}
+
+	trace_iomap_iter(iter1, ops, _RET_IP_);
+	ret = iomap_iter_advance(iter1);
+	if (ret <= 0)
+		return ret;
+	ret = iomap_iter_advance(iter2);
+	if (ret <= 0)
+		return ret;
+
+	ret = ops->iomap_begin(iter1->inode, iter1->pos, iter1->len, iter1->flags,
+			       &iter1->iomap, &iter1->srcmap);
+	if (ret < 0)
+		return ret;
+	iomap_iter_done(iter1);
+
+	ret = ops->iomap_begin(iter2->inode, iter2->pos, iter2->len, iter2->flags,
+			       &iter2->iomap, &iter2->srcmap);
+	if (ret < 0)
+		return ret;
+	iomap_iter_done(iter2);
+	return 1;
+}
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 24f8489583ca..ebef060c65cd 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -186,6 +186,8 @@ struct iomap_iter {
 };
 
 int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops);
+int iomap_iter2(struct iomap_iter *iter, struct iomap_iter *iter2,
+		const struct iomap_ops *ops);
 
 /**
  * iomap_length - length of the current iomap iteration
-- 
2.32.0




  parent reply	other threads:[~2021-08-16  6:04 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16  6:03 [PATCH v7 0/8] fsdax,xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 1/8] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-08-18 21:01   ` Dan Williams
2021-08-16  6:03 ` [PATCH v7 2/8] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-08-19 22:35   ` Dan Williams
2021-08-16  6:03 ` [PATCH v7 3/8] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-08-19 22:54   ` Dan Williams
2021-08-23 12:57     ` Christoph Hellwig
2021-08-27  3:22       ` Shiyang Ruan
2021-08-27  5:00         ` Dan Williams
2021-08-27  5:26           ` Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 4/8] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-08-20  2:39   ` Dan Williams
2021-08-27  3:23     ` Shiyang Ruan
2021-08-16  6:03 ` Shiyang Ruan [this message]
2021-08-23 12:58   ` [PATCH v7 5/8] iomap: Introduce iomap_iter2 for two files Christoph Hellwig
2021-08-16  6:03 ` [PATCH v7 6/8] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-08-23 13:16   ` Christoph Hellwig
2021-08-16  6:03 ` [PATCH v7 7/8] fsdax: Introduce dax_iomap_ops for end of reflink Shiyang Ruan
2021-08-20  3:01   ` Dan Williams
     [not found]     ` <c7e68dc8-5a43-f727-c262-58dcf244c711@fujitsu.com>
2021-08-20 15:18       ` Dan Williams
2021-08-23 13:02         ` Christoph Hellwig
2021-08-27  3:29         ` Shiyang Ruan
2021-08-27  5:04           ` Dan Williams
2021-08-27  5:27             ` Shiyang Ruan
2021-08-16  6:03 ` [PATCH v7 8/8] fs/xfs: Add dax dedupe support Shiyang Ruan
2021-08-20  3:08   ` Dan Williams
2021-08-27  3:36     ` Shiyang Ruan

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