[PATCH 5.10 018/157] zonefs: fix to update .i_wr_refcnt correctly in zonefs_open_zone()

Greg Kroah-Hartman
2021-03-22T12:41:24Z

From: Chao Yu <yuchao0@huawei.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@vger.kernel.org>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);