libfs: prepare to allow for non-immutable pidfd inodes

Allow for S_IMMUTABLE to be stripped so that we can support xattrs.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-10-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/libfs.c b/fs/libfs.c
index 997d3a363ce6cb4dad9b932000fa97ec4ed3ed04..c5b520df90326915ed1856b5c97f5f110686ed68 100644 (file)
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -2162,7 +2162,6 @@ static struct dentry *prepare_anon_dentry(struct dentry **stashed,
 
        /* Notice when this is changed. */
        WARN_ON_ONCE(!S_ISREG(inode->i_mode));
-       WARN_ON_ONCE(!IS_IMMUTABLE(inode));
 
        dentry = d_alloc_anon(sb);
        if (!dentry) {