[Toybox] [PATCH] vi: Replace linelist with mem_block based design

[Rob Landley]

On 1/17/20 12:13 AM, enh wrote:
>> Yeah i was thinking of saving temp file and then unloading mmap and
>> original file (and rest of my allocated blocks) and then rename() and
>> for extra cheese maybe file permissions and such need to be copied
>> from original file...
> 
> i think vim does the opposite --- it renames the existing file, then
> writes to the old file name, then unlinks the renamed original if
> everything goes okay.

Which still means there's a moment where a log replay produces a filesystem that
hasn't got a usable copy of that file at that name. (Rename is atomic and
deletes the target dentry, why would they _not_ do that? They've already got
.$FILENAME.sw? files lying around after every unexpected poweroff.)

Rob

P.S. By the way, any BIOS that wakes the system up from suspend because the
power got too low needs a way to shut that off. I'm aware it's signaling windows
to save to disk, but I've yet to encounter a Linux that actually notices. It
just means "I have 2 more hours of suspend time to plug this in" turns into "my
laptop is very hot coming out of my bag, and the battery's dead".