linux-kernel - [PATCH] ovl: set I_CREATING on inode being created

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Message-ID: <20180822085522.GA14354@veci.piliscsaba.redhat.com>
Date:   Wed, 22 Aug 2018 10:55:22 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-unionfs@...r.kernel.org, viro@...iv.linux.org.uk
Subject: [PATCH] ovl: set I_CREATING on inode being created

...otherwise there will be list corruption due to inode_sb_list_add() being
called for inode already on the sb list.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Fixes: e950564b97fd ("vfs: don't evict uninitialized inode")
---
This missed the 4.19 overlay pull request, because it fixes a bug
introduced by patch not in said pull (buggy patch is also mine,
incidentally).

 fs/overlayfs/dir.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -603,6 +603,10 @@ static int ovl_create_object(struct dent
 	if (!inode)
 		goto out_drop_write;
 
+	spin_lock(&inode->i_lock);
+	inode->i_state |= I_CREATING;
+	spin_unlock(&inode->i_lock);
+
 	inode_init_owner(inode, dentry->d_parent->d_inode, mode);
 	attr.mode = inode->i_mode;