Re: [PATCH 25/28] VFS: statfs(64) shouldn't follow last component symlink
From: Mike Waychison (Michael.Waychison_at_Sun.COM)
Date: 10/25/04
- Previous message: Mike Waychison: "[PATCH 13/28] VFS: Introduce soft reference counts"
- In reply to: Christoph Hellwig: "Re: [PATCH 25/28] VFS: statfs(64) shouldn't follow last component symlink"
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Date: Mon, 25 Oct 2004 11:21:56 -0400 To: Christoph Hellwig <hch@infradead.org>
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Christoph Hellwig wrote:
> On Mon, Oct 25, 2004 at 10:51:11AM -0400, Mike Waychison wrote:
>
>>Mount-related userspace tools will require the ability to detect whether what
>>looks like a regular directory is actually a autofs trigger. To handle this,
>>tools can statfs a given directory and check to see if statfs->f_type ==
>>AUTOFSNG_SUPER_MAGIC before walking into the directory (and causing the a
>>filesystem to automount).
>>
>>To make this happen, we cannot allow statfs to follow_link.
>>
>>NOTE: This may break any userspace that assumes it can statfs across a
>>last-component symlink. I can't think of any real world breakage however, as
>>mount(8) will drop the real path in /etc/mtab and /proc/mounts will always
>>show the true path.
>
>
> Which means it's vetoed. It's a big change in syscall semantics. And
> propabably breaks SuS (for statvfs(3) which requires full symlink
> resolution when it just refers to a path on the filesystem.
>
Ya, I figured that would be the case. What do folks think about a
lstatfs(64)?
- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice
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NOTICE: The opinions expressed in this email are held by me,
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- Previous message: Mike Waychison: "[PATCH 13/28] VFS: Introduce soft reference counts"
- In reply to: Christoph Hellwig: "Re: [PATCH 25/28] VFS: statfs(64) shouldn't follow last component symlink"
- Next in thread: Christoph Hellwig: "Re: [PATCH 15/28] VFS: Mountpoint file descriptor umount support"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
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