linux-ext4 - [PATCH v4 1/3] ext4: don't increase iversion counter for ea

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Message-Id: <20220824160349.39664-1-lczerner@redhat.com>
Date:   Wed, 24 Aug 2022 18:03:47 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, jlayton@...nel.org, jack@...e.cz,
        linux-fsdevel@...r.kernel.org, ebiggers@...nel.org,
        david@...morbit.com, Christian Brauner <brauner@...nel.org>
Subject: [PATCH v4 1/3] ext4: don't increase iversion counter for ea_inodes

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().

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>
---
v2, v3, v4: no change

 fs/ext4/inode.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 601214453c3a..2a220be34caa 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5731,7 +5731,12 @@ int ext4_mark_iloc_dirty(handle_t *handle,
 	}
 	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 */
-- 
2.37.1