linux-ext4 - [RFC PATCH 11/18] iomap: add a fs private parameter to iomap

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Message-Id: <20231123125121.4064694-12-yi.zhang@huaweicloud.com>
Date: Thu, 23 Nov 2023 20:51:13 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	ritesh.list@...il.com,
	hch@...radead.org,
	djwong@...nel.org,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [RFC PATCH 11/18] iomap: add a fs private parameter to iomap_ioend

From: Zhang Yi <yi.zhang@...wei.com>

Add a private parameter to iomap_ioend structure, letting filesystems
can pass something they needed from .prepare_ioend() to IO end.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/iomap/buffered-io.c | 1 +
 include/linux/iomap.h  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 2bc0aa23fde3..fd4d43bafd1b 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1676,6 +1676,7 @@ iomap_alloc_ioend(struct inode *inode, struct iomap_writepage_ctx *wpc,
 	ioend->io_offset = offset;
 	ioend->io_bio = bio;
 	ioend->io_sector = sector;
+	ioend->io_private = NULL;
 	return ioend;
 }
 
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 96dd0acbba44..8b3296a5474d 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -300,6 +300,7 @@ struct iomap_ioend {
 	sector_t		io_sector;	/* start sector of ioend */
 	struct bio		*io_bio;	/* bio being built */
 	struct bio		io_inline_bio;	/* MUST BE LAST! */
+	void			*io_private;	/* fs private pointer */
 };
 
 struct iomap_writeback_ops {
-- 
2.39.2