linux-kernel - [PATCH 5.10 018/157] zonefs: fix to update .i_wr_refcnt correctly in zonefs_open

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Date:   Mon, 22 Mar 2021 13:26:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Damien Le Moal <damien.lemoal@....com>
Subject: [PATCH 5.10 018/157] zonefs: fix to update .i_wr_refcnt correctly in zonefs_open_zone()

From: Chao Yu <yuchao0@...wei.com>

commit 6980d29ce4da223ad7f0751c7f1d61d3c6b54ab3 upstream.

In zonefs_open_zone(), if opened zone count is larger than
.s_max_open_zones threshold, we missed to recover .i_wr_refcnt,
fix this.

Fixes: b5c00e975779 ("zonefs: open/close zone on file open/close")
Cc: <stable@...r.kernel.org>
Signed-off-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Damien Le Moal <damien.lemoal@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/zonefs/super.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -1032,9 +1032,7 @@ static int zonefs_open_zone(struct inode
 
 	mutex_lock(&zi->i_truncate_mutex);
 
-	zi->i_wr_refcnt++;
-	if (zi->i_wr_refcnt == 1) {
-
+	if (!zi->i_wr_refcnt) {
 		if (atomic_inc_return(&sbi->s_open_zones) > sbi->s_max_open_zones) {
 			atomic_dec(&sbi->s_open_zones);
 			ret = -EBUSY;
@@ -1044,7 +1042,6 @@ static int zonefs_open_zone(struct inode
 		if (i_size_read(inode) < zi->i_max_size) {
 			ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
 			if (ret) {
-				zi->i_wr_refcnt--;
 				atomic_dec(&sbi->s_open_zones);
 				goto unlock;
 			}
@@ -1052,6 +1049,8 @@ static int zonefs_open_zone(struct inode
 		}
 	}
 
+	zi->i_wr_refcnt++;
+
 unlock:
 	mutex_unlock(&zi->i_truncate_mutex);