linux-kernel - [PATCH 5.15 096/530] ext4: dont increase iversion counter for ea

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Message-Id: <20221024113049.362333658@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:27:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, stable@...nel.org,
        Lukas Czerner <lczerner@...hat.com>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        "Christian Brauner (Microsoft)" <brauner@...nel.org>,
        Theodore Tso <tytso@....edu>
Subject: [PATCH 5.15 096/530] ext4: dont increase iversion counter for ea_inodes

From: Lukas Czerner <lczerner@...hat.com>

commit 50f094a5580e6297bf10a807d16f0ee23fa576cf upstream.

ea_inodes are using i_version for storing part of the reference count so
we really need to leave it alone.

The problem can be reproduced by xfstest ext4/026 when iversion is
enabled. Fix it by not calling inode_inc_iversion() for EXT4_EA_INODE_FL
inodes in ext4_mark_iloc_dirty().

Cc: stable@...nel.org
Signed-off-by: Lukas Czerner <lczerner@...hat.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Christian Brauner (Microsoft) <brauner@...nel.org>
Link: https://lore.kernel.org/r/20220824160349.39664-1-lczerner@redhat.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ext4/inode.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5701,7 +5701,12 @@ int ext4_mark_iloc_dirty(handle_t *handl
 	}
 	ext4_fc_track_inode(handle, inode);
 
-	if (IS_I_VERSION(inode))
+	/*
+	 * ea_inodes are using i_version for storing reference count, don't
+	 * mess with it
+	 */
+	if (IS_I_VERSION(inode) &&
+	    !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
 		inode_inc_iversion(inode);
 
 	/* the do_update_inode consumes one bh->b_count */