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From: Chengguang Xu <cgxu519@mykernel.net>
To: miklos@szeredi.hu, jack@suse.cz, amir73il@gmail.com
Cc: linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Chengguang Xu <cgxu519@mykernel.net>
Subject: [RFC PATCH v3 09/10] ovl: introduce helper of syncfs writeback inode waiting
Date: Sun,  8 Nov 2020 22:03:06 +0800
Message-ID: <20201108140307.1385745-10-cgxu519@mykernel.net> (raw)
In-Reply-To: <20201108140307.1385745-1-cgxu519@mykernel.net>

Introduce a helper ovl_wait_wb_inodes() to wait until all
target upper inodes finish writeback.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
 fs/overlayfs/super.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e5607a908d82..9a535fc11221 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -255,6 +255,36 @@ static void ovl_put_super(struct super_block *sb)
 	ovl_free_fs(ofs);
 }
 
+void ovl_wait_wb_inodes(struct ovl_fs *ofs)
+{
+	LIST_HEAD(tmp_list);
+	struct ovl_inode *oi;
+	struct inode *upper;
+
+	spin_lock(&ofs->syncfs_wait_list_lock);
+	list_splice_init(&ofs->syncfs_wait_list, &tmp_list);
+
+	while (!list_empty(&tmp_list)) {
+		oi = list_first_entry(&tmp_list, struct ovl_inode, wait_list);
+		list_del_init(&oi->wait_list);
+		ihold(&oi->vfs_inode);
+		spin_unlock(&ofs->syncfs_wait_list_lock);
+
+		upper = ovl_inode_upper(&oi->vfs_inode);
+		if (!mapping_tagged(upper->i_mapping, PAGECACHE_TAG_WRITEBACK)) {
+			iput(&oi->vfs_inode);
+			goto wait_next;
+		}
+
+		filemap_fdatawait_keep_errors(upper->i_mapping);
+		iput(&oi->vfs_inode);
+		cond_resched();
+wait_next:
+		spin_lock(&ofs->syncfs_wait_list_lock);
+	}
+	spin_unlock(&ofs->syncfs_wait_list_lock);
+}
+
 /* Sync real dirty inodes in upper filesystem (if it exists) */
 static int ovl_sync_fs(struct super_block *sb, int wait)
 {
-- 
2.26.2



  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-08 14:02 [RFC PATCH v3 00/10] implement containerized syncfs for overlayfs Chengguang Xu
2020-11-08 14:02 ` [RFC PATCH v3 01/10] ovl: setup overlayfs' private bdi Chengguang Xu
2020-11-08 14:02 ` [RFC PATCH v3 02/10] ovl: introduce waiting list for syncfs Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 03/10] ovl: implement ->writepages operation Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 04/10] ovl: implement overlayfs' ->evict_inode operation Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 05/10] ovl: mark overlayfs' inode dirty on modification Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 06/10] ovl: mark overlayfs' inode dirty on shared mmap Chengguang Xu
2020-11-11 13:05   ` 回复:[RFC " Chengguang Xu
2020-11-11 15:20     ` [RFC " Amir Goldstein
2020-11-11 16:09       ` Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 07/10] ovl: implement overlayfs' ->write_inode operation Chengguang Xu
2020-11-10 13:45   ` Jan Kara
2020-11-10 15:12     ` Chengguang Xu
2020-11-11 10:54       ` Jan Kara
2020-11-10 16:18     ` Amir Goldstein
2020-11-08 14:03 ` [RFC PATCH v3 08/10] ovl: cache dirty overlayfs' inode Chengguang Xu
2020-11-08 14:03 ` Chengguang Xu [this message]
2020-11-09  3:33   ` 回复:[RFC PATCH v3 09/10] ovl: introduce helper of syncfs writeback inode waiting Chengguang Xu
2020-11-09  7:07     ` [RFC " Amir Goldstein
2020-11-09  8:34       ` Chengguang Xu
2020-11-09 10:07         ` Amir Goldstein
2020-11-09 12:06           ` Chengguang Xu
2020-11-08 14:03 ` [RFC PATCH v3 10/10] ovl: implement containerized syncfs for overlayfs Chengguang Xu

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