Date: Mon, 20 Jan 2003 11:11:35 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: David Schultz <dschultz@uclink.Berkeley.EDU> Cc: Jan Srzednicki <winfried@student.agh.edu.pl>, current@FreeBSD.ORG Subject: Re: background fsck did not create lost+found Message-ID: <200301201911.h0KJBZ4g065531@apollo.backplane.com> References: <Pine.GSO.4.44.0301201630350.22474-100000@student.uci.agh.edu.pl> <20030120183442.GA2778@HAL9000.homeunix.com>
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:However, when you are saving a new version of an important file,
:you need to be careful that the new version (and its directory
:entry) hits the disk before the old one goes away. I know that vi
:saves files in a safe way, whereas ee and emacs do not. (Emacs
:introduces only a small race, though.) Also, mv will DTRT only if
:the source and destination files live on the same filesystem.
:
I think you have that reversed. vi just overwrites the destination
file (O_CREAT|O_TRUNC, try ktrace'ing a vi session and you will see).
I believe emacs defaults to a mode where it creates a new file and
renames it over the original.
This means that there is a period of time where a crash may result in
the loss of the file if the vi session cannot be recovered (with vi -r)
after the fact.
-Matt
Matthew Dillon
<dillon@backplane.com>
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