- fsync is never retried. After a writeback error Linux may mark the
pages clean, so a retried fsync could succeed although the data was
lost, and the rename then replaced a good file with a bad one.
- New files get 0666 & ~umask instead of mkstemp's 0600. Replaced files
keep their mode (file-type bits masked) and, best effort, their owner
and group.
- Saving through a symlink writes the link's target instead of
replacing the link with a regular file (SaveAs did not resolve it).
- A file with several hard links is rewritten in place, so the other
names see the new content (as vim does by default).
- Save-as (prompt and ':save-as') asks before replacing any existing
file other than the buffer's own; it used to ask only for unnamed
buffers. Save-and-quit refuses to overwrite a file changed on disk,
like save. The first save of a new file records the saved undo state.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015rcVQiiWyTzoNrsvLSaAfB
Claude
ec8159ea2e