FAILED: patch "[PATCH] xfs: make the rtsummary repair fix the file size too" failed to apply to 6.12-stable tree

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 6b760b3232b3efc8bcc7c165e76300bc1c9140c5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026091620-ravioli-catfish-14c5@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6b760b3232b3efc8bcc7c165e76300bc1c9140c5 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <[email protected]>
Date: Wed, 2 Sep 2026 22:52:07 -0700
Subject: [PATCH] xfs: make the rtsummary repair fix the file size too

LOLLM noticed that the rtsummary repair code will create a new rtsummary with the correct file size, but it won't force the new file size to be set on the existing rtsummary file, leaving the rtsummary corrupt. Fix this by setting up the tempfile mapping-exchange to run to the end of both files, which is the magic offset needed to reset the file size.

index f065c3e51ce2..ed763290aec1 100644
@@ -164,9 +164,10 @@ xrep_rtsummary(
 	/*
 	 * Now exchange the contents.  Nothing in repair uses the temporary
 	 * buffer, so we can reuse it for the tempfile exchrange information.
+	 * Use XFS_MAX_FILEOFF here so that we correct the rtsummary file size.
 	 */
 	error = xrep_tempexch_trans_reserve(sc, XFS_DATA_FORK, 0,
-			rts->rsumblocks, &rts->tempexch);
+			XFS_MAX_FILEOFF, &rts->tempexch);
 	if (error)
 		return error;