Date: Mon, 13 Mar 1995 00:39:27 -0600 (CST) From: jbryant@server.iadfw.net To: bde@zeta.org.au (Bruce Evans) Cc: freebsd-hackers@FreeBSD.org, jbryant@news.iadfw.net Subject: Re: rename bug Message-ID: <199503130639.AAA13878@server.iadfw.net> In-Reply-To: <199503130451.OAA21901@godzilla.zeta.org.au> from "Bruce Evans" at Mar 13, 95 02:51:17 pm
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In reply:
> Date: Mon, 13 Mar 1995 14:51:17 +1000
> From: Bruce Evans <bde@zeta.org.au>
> To: freebsd-hackers@FreeBSD.org, jbryant@server.iadfw.net
> Subject: Re: rename bug
>
> >> > The bug is when a rename(2) is called, the rename happens as per spec,
> >> > except that the kernel isn't being updated as to the available space on
> >> > the filesystem. A reboot is needed to recognize the space is available.
> >> >
> >> > For instance every time we add a user, our root filesystem APPEARS to
> >> > have lost 1508k, this is caused when pwd_mkdb renames pwd.db.tmp to
> >> > pwd.db, and spwd.db.tmp to spwd.db.
>
> This is fixed in FreeBSD-current and wasn't in FreeBSD-2.0.
>
> >> > I am confident that it is in the rename(2) system call.
>
> Yes, it forgot to clear a reference held by the vm layer, so the old
> file didn't go away.
>
> >> can you show me a script(1) of the bug occuring?
>
> cd /tmp; >x; >y; mv x y; fsck -n ...
>
> This only consumes one inode because `y' is empty.
>
> At first I thought you were saying that there was a problem rebuilding
> the password database when the disk is full for other reasons.
I cannot currently get the kernel to link [autoconf.o and ioconf.o show
unresolved references] using the -current sources.
I am currently using the 2.0-950210-SNAP.
Which source files should I grab for the fix? I CAN compile the SNAP.
We really need a fix for this... I am still looking for the rename(2)
source in 2.0-950210-SNAP... It does not seem to exist in lib/libc/stdio
where it belongs... A grep of the entire source tree seems to only give
me declarations, but not the sources [search term 'rename']...
Jim
--
All opinions expressed are mine, if you | "I will not be pushed, stamped,
think otherwise, then go jump into turbid | briefed, debriefed, indexed, or
radioactive waters and yell WAHOO !!! | numbered!" - #1, "The Prisoner"
jbryant@server.iadfw.net, System administrator, Internet America
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