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Message-Id: <202308110712.37B7CIwo078462@mse-fl2.zte.com.cn>
Date: Fri, 11 Aug 2023 14:45:00 +0800 (CST)
From: <ruan.meisi@....com.cn>
To: <miklos@...redi.hu>
Cc: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] nlookup missing decrement in fuse_direntplus_link
>From 53aad83672123dbe01bcef9f9026becc4e93ee9f Mon Sep 17 00:00:00 2001
From: ruanmeisi <ruan.meisi@....com.cn>
Date: Tue, 25 Apr 2023 19:13:54 +0800
Subject: [PATCH] nlookup missing decrement in fuse_direntplus_link
During our debugging of glusterfs, we found an Assertion
failed error: inode_lookup >= nlookup, which was caused by the
nlookup value in the kernel being greater than that in the FUSE
file system.The issue was introduced by fuse_direntplus_link,
where in the function, fuse_iget increments nlookup, and if
d_splice_alias returns failure, fuse_direntplus_link returns
failure without decrementing nlookup
https://github.com/gluster/glusterfs/pull/4081
Signed-off-by: ruanmeisi <ruan.meisi@....com.cn>
---
fs/fuse/readdir.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/fuse/readdir.c b/fs/fuse/readdir.c
index dc603479b30e..b3d498163f97 100644
--- a/fs/fuse/readdir.c
+++ b/fs/fuse/readdir.c
@@ -243,8 +243,16 @@ static int fuse_direntplus_link(struct file *file,
dput(dentry);
dentry = alias;
}
- if (IS_ERR(dentry))
+ if (IS_ERR(dentry)) {
+ if (!IS_ERR(inode)) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ spin_lock(&fi->lock);
+ fi->nlookup--;
+ spin_unlock(&fi->lock);
+ }
return PTR_ERR(dentry);
+ }
}
if (fc->readdirplus_auto)
set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
--
2.27.0
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