diff mbox series

[5.8,039/232] btrfs: make sure SB_I_VERSION doesnt get unset by remount

Message ID 20200820091614.669649341@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Aug. 20, 2020, 9:18 a.m. UTC 
From: Josef Bacik <josef@toxicpanda.com>

commit faa008899a4db21a2df99833cb4ff6fa67009a20 upstream.

There's some inconsistency around SB_I_VERSION handling with mount and
remount.  Since we don't really want it to be off ever just work around
this by making sure we don't get the flag cleared on remount.

There's a tiny cpu cost of setting the bit, otherwise all changes to
i_version also change some of the times (ctime/mtime) so the inode needs
to be synced. We wouldn't save anything by disabling it.

Reported-by: Eric Sandeen <sandeen@redhat.com>
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add perf impact analysis ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/super.c |    6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1897,6 +1897,12 @@  static int btrfs_remount(struct super_bl
 		set_bit(BTRFS_FS_OPEN, &fs_info->flags);
 	}
 out:
+	/*
+	 * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS,
+	 * since the absence of the flag means it can be toggled off by remount.
+	 */
+	*flags |= SB_I_VERSION;
+
 	wake_up_process(fs_info->transaction_kthread);
 	btrfs_remount_cleanup(fs_info, old_opts);
 	return 0;