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From: Chengguang Xu <cgxu519@mykernel.net>
To: miklos@szeredi.hu, amir73il@gmail.com, jack@suse.cz
Cc: linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Chengguang Xu <cgxu519@mykernel.net>
Subject: [RFC PATCH v2 6/8] ovl: implement overlayfs' ->write_inode operation
Date: Sun, 25 Oct 2020 11:41:15 +0800
Message-ID: <20201025034117.4918-7-cgxu519@mykernel.net> (raw)
In-Reply-To: <20201025034117.4918-1-cgxu519@mykernel.net>

Implement overlayfs' ->write_inode to sync dirty data
and redirty overlayfs' inode if necessary.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
 fs/overlayfs/super.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 5d7e12b8bd1f..960e79e7a8b5 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -15,6 +15,7 @@
 #include <linux/seq_file.h>
 #include <linux/posix_acl_xattr.h>
 #include <linux/exportfs.h>
+#include <linux/writeback.h>
 #include "overlayfs.h"
 
 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
@@ -396,11 +397,36 @@ static void ovl_evict_inode (struct inode *inode)
 	clear_inode(inode);
 }
 
+static int ovl_write_inode(struct inode *inode,
+			   struct writeback_control *wbc)
+{
+	struct inode *upper = ovl_inode_upper(inode);
+	unsigned long iflag = 0;
+	int ret = 0;
+
+	if (!upper)
+		return 0;
+
+	if (upper->i_sb->s_op->write_inode)
+		ret = upper->i_sb->s_op->write_inode(inode, wbc);
+
+	iflag |= upper->i_state & I_DIRTY_ALL;
+	if (mapping_writably_mapped(upper->i_mapping) ||
+	    mapping_tagged(upper->i_mapping, PAGECACHE_TAG_WRITEBACK))
+		iflag |= I_DIRTY_PAGES;
+
+	if (iflag)
+		ovl_mark_inode_dirty(inode);
+
+	return ret;
+}
+
 static const struct super_operations ovl_super_operations = {
 	.alloc_inode	= ovl_alloc_inode,
 	.free_inode	= ovl_free_inode,
 	.destroy_inode	= ovl_destroy_inode,
 	.drop_inode	= generic_delete_inode,
+	.write_inode	= ovl_write_inode,
 	.evict_inode	= ovl_evict_inode,
 	.put_super	= ovl_put_super,
 	.sync_fs	= ovl_sync_fs,
-- 
2.26.2



  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-25  3:41 [RFC PATCH v2 0/8] implement containerized syncfs for overlayfs Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 1/8] ovl: setup overlayfs' private bdi Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 2/8] ovl: implement ->writepages operation Chengguang Xu
2020-11-02 17:17   ` Jan Kara
2020-11-04 12:18     ` Chengguang Xu
2020-11-05 13:55       ` Jan Kara
2020-11-06  5:57         ` Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 3/8] ovl: implement overlayfs' ->evict_inode operation Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 4/8] ovl: mark overlayfs' inode dirty on modification Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 5/8] ovl: mark overlayfs' inode dirty on shared writable mmap Chengguang Xu
2020-11-02 17:30   ` Jan Kara
2020-11-04 11:54     ` Chengguang Xu
2020-11-05 14:03       ` Jan Kara
2020-11-05 14:21         ` Amir Goldstein
2020-11-05 15:54           ` Jan Kara
2020-11-06  2:41             ` Chengguang Xu
2020-11-06  8:50               ` Jan Kara
2020-11-06  9:47                 ` Chengguang Xu
2020-10-25  3:41 ` Chengguang Xu [this message]
2020-10-25  3:41 ` [RFC PATCH v2 7/8] ovl: cache dirty overlayfs' inode Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 8/8] ovl: implement containerized syncfs for overlayfs Chengguang Xu
2020-10-30 15:46 ` [RFC PATCH v2 0/8] " Miklos Szeredi
2020-10-31 12:22   ` Chengguang Xu

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