From: Andrew Morton <akpm@osdl.org>
To: Paul Jakma <paul@clubi.ie>
Cc: linux-kernel@vger.kernel.org
Subject: Re: chmod of active swap file blocks
Date: Mon, 29 Dec 2003 01:30:40 -0800 [thread overview]
Message-ID: <20031229013040.0a953dd0.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.56.0312290434360.2270@fogarty.jakma.org>
Paul Jakma <paul@clubi.ie> wrote:
>
> Hi,
>
> Trying to chmod a file being used for swap causes chmod() to block,
> with permissions change /not/ having taken effect, until the swap
> file is swapoff'd, at which point chmod() carries on and chmod (the
> command) finishes.
The kernel holds the swapfile's i_sem while it is in use. This is to
prevent the filesystem destruction which would result if some silly person
were to truncate a swapfile while it was in active use.
It is not a particularly important safety feature ("don't do that") and it
can be taken out if it is causing serious side-effects.
Is chmod of an in-use swapfile an important thing to be able to do?
next prev parent reply other threads:[~2003-12-29 9:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-29 4:55 Paul Jakma
2003-12-29 5:16 ` Paul Jakma
2003-12-29 9:30 ` Andrew Morton [this message]
2003-12-29 17:25 ` Paul Jakma
2004-01-01 8:19 ` Neale Banks
2004-01-01 10:12 ` Andrew Morton
2004-01-01 14:10 ` Andries Brouwer
2004-01-01 21:40 ` Erik Andersen
2004-01-02 0:43 ` Paul Jakma
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20031229013040.0a953dd0.akpm@osdl.org \
--to=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=paul@clubi.ie \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome