linux-kernel - [PATCH v3 2/2] afs: unlock the folio when vnode is marked deleted

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Date:   Thu,  7 Jul 2022 12:51:12 +0800
From:   xiubli@...hat.com
To:     dhowells@...hat.com, idryomov@...il.com, jlayton@...nel.org
Cc:     marc.dionne@...istor.com, willy@...radead.org,
        keescook@...omium.org, kirill.shutemov@...ux.intel.com,
        william.kucharski@...cle.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-cachefs@...hat.com, vshankar@...hat.com,
        Xiubo Li <xiubli@...hat.com>
Subject: [PATCH v3 2/2] afs: unlock the folio when vnode is marked deleted

From: Xiubo Li <xiubli@...hat.com>

The check_write_begin() should unlock the folio if return non-zero,
otherwise locked.

URL: https://tracker.ceph.com/issues/56423
Signed-off-by: Xiubo Li <xiubli@...hat.com>
---
 fs/afs/file.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/afs/file.c b/fs/afs/file.c
index afacce797fb9..b23e7b5a48ad 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -379,7 +379,13 @@ static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
 {
 	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
 
-	return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0;
+	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+		folio_unlock(*folio);
+		folio_put(*folio);
+		return -ESTALE;
+	}
+
+	return 0;
 }
 
 static void afs_free_request(struct netfs_io_request *rreq)
-- 
2.36.0.rc1