linux-kernel - Re: [PATCH -V21 00/12] Generic name to handle and open by handle syscalls

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Message-ID: <20101011233443.GB16442@fieldses.org>
Date:	Mon, 11 Oct 2010 19:34:43 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com,
	corbet@....net, neilb@...e.de, npiggin@...nel.dk,
	hooanon05@...oo.co.jp, miklos@...redi.hu,
	linux-fsdevel@...r.kernel.org, sfrench@...ibm.com,
	philippe.deniel@....FR, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V21 00/12] Generic name to handle and open by handle
 syscalls

On Tue, Oct 05, 2010 at 03:52:08PM +0530, Aneesh Kumar K.V wrote:
> Hi,
> 
> The below set of patches implement open by handle support using exportfs
> operations. This allows user space application to map a file name to file
> handle and later open the file using handle. This should be usable
> for userspace NFS [1] and 9P server [2]. XFS already support this with the ioctls
> XFS_IOC_PATH_TO_HANDLE and XFS_IOC_OPEN_BY_HANDLE.
> 
> [1] http://nfs-ganesha.sourceforge.net/
> [2] http://thread.gmane.org/gmane.comp.emulators.qemu/68992
> 
> git repo for the patchset at:
> git://git.kernel.org/pub/scm/linux/kernel/git/kvaneesh/linux-open-handle.git open-by-handle
> 
> Test case can be found at
> http://git.kernel.org/?p=fs/ext2/kvaneesh/handle-test.git
> git://git.kernel.org/pub/scm/fs/ext2/kvaneesh/handle-test.git
> 
> Changes from V20:
> a) Use better variable names
> b) change handle_size type to __u32
> c) max handle size is now nfsv4 handle size. Considering file system would
>    want to support a handle that can fit into nfsv4 handle size limiting
>    max handle size to 128 rather than 4096 is the right thing.

Looks OK to me.

I haven't read the later patches carefully, but in general an interface
like this seems to me a useful thing to have.

--b.

> d) I didn't add Ceph changes in the series. I am expecting the changes
>    will go via Ceph tree.
> 
> -aneesh
> 
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