1 files changed, 2 insertions, 0 deletions

diff --git a/fs/inode.c b/fs/inode.c
index c99163b1b310..033529ecd242 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1551,6 +1551,8 @@ void touch_atime(struct path *path)
          * Btrfs), but since we touch atime while walking down the path we
          * really don't care if we failed to update the atime of the file,
          * so just ignore the return value.
+         * We may also fail on filesystems that have the ability to make parts
+         * of the fs read only, e.g. subvolumes in Btrfs.
          */
         update_time(inode, &now, S_ATIME);
         mnt_drop_write(mnt);