From: Lars Noschinski <lklml@ml.noschinski.de>
To: linux-kernel@vger.kernel.org
Subject: How does ext2 implement sparse files?
Date: Thu, 31 Jan 2008 16:28:23 +0100 [thread overview]
Message-ID: <20080131152823.GA29422@lars.home.noschinski.de> (raw)
Hello!
For an university project, we had to write a toy filesystem (ext2-like),
for which I would like to implement sparse file support. For this, I
digged through the ext2 source code; but I could not find the point,
where ext2 detects holes.
As far as I can see from fs/buffer.c, an hole is a buffer_head which is
not mapped, but uptodate. But I cannot find a relevant source line,
where ext2 makes usage of this information.
Any hints would be greatly appreciated,
Lars.
[Please CC me on answers, I'm not subscribed]
next reply other threads:[~2008-01-31 15:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-31 15:28 Lars Noschinski [this message]
2008-01-31 16:51 ` Lennart Sorensen
2008-01-31 17:18 ` Chris Snook
2008-01-31 18:14 ` Andi Kleen
2008-02-01 10:34 ` Shuduo Sang
2008-02-01 11:08 ` Eric Dumazet
2008-02-01 11:55 ` Lars Noschinski
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=20080131152823.GA29422@lars.home.noschinski.de \
--to=lklml@ml.noschinski.de \
--cc=linux-kernel@vger.kernel.org \
/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
all inboxes | Powered by JetHome®