From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
To: Andreas Dilger <andreas.dilger@oracle.com>, Neil Brown <neilb@suse.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
"adilger\@sun.com" <adilger@sun.com>,
"corbet\@lwn.net" <corbet@lwn.net>,
"npiggin\@kernel.dk" <npiggin@kernel.dk>,
"hooanon05\@yahoo.co.jp" <hooanon05@yahoo.co.jp>,
"bfields\@fieldses.org" <bfields@fieldses.org>,
"miklos\@szeredi.hu" <miklos@szeredi.hu>,
"linux-fsdevel\@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"sfrench\@us.ibm.com" <sfrench@us.ibm.com>,
"philippe.deniel\@CEA.FR" <philippe.deniel@CEA.FR>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks
Date: Sat, 21 Aug 2010 15:02:14 +0530 [thread overview]
Message-ID: <m339u8s44h.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <17761610-AFA9-4BB5-AF62-CD54D67F5C79@oracle.com>
On Sat, 21 Aug 2010 01:13:52 -0600, Andreas Dilger <andreas.dilger@oracle.com> wrote:
> On 2010-08-20, at 18:09, Neil Brown <neilb@suse.de> wrote:
> > How about a new AT flag: AT_FILE_HANDLE
> >
> > Meaning is that the 'dirfd' is used only to identify a filesystem (vfsmnt) and
> > the 'name' pointer actually points to a filehandle fragment interpreted in
> > that filesystem.
> >
> > One problem is that there is no way to pass the length...
> > Options:
> > fragment is at most 64 bytes nul padded at the end
> > fragment is hex encoded and nul terminated
> > ??
> >
> > I think I prefer the hex encoding, but I'm hoping someone else has a better
> > idea.
>
> That makes it ugly for the kernel to stringify and parse the file handles.
>
> How about for AT_FILE_HANDLE THE FIRST __u32 (maybe with an extra
> __u32 for alignment) is the length and the rest of the binary file
> handle follows this? In fact, doesn't the handle itself already
> encode the length in the header?
struct file_handle already include length
-aneesh
next prev parent reply other threads:[~2010-08-21 9:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-20 1:51 [PATCH -V18 0/13] Generic name to handle and open by handle syscalls Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 01/13] exportfs: Return the minimum required handle size Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 02/13] vfs: Add name to file handle conversion support Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 03/13] vfs: Add open by file handle support Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 04/13] vfs: Allow handle based open on symlinks Aneesh Kumar K.V
2010-08-20 2:13 ` Aneesh Kumar K. V
2010-08-20 6:53 ` Aneesh Kumar K. V
2010-08-20 8:30 ` Christoph Hellwig
2010-08-20 9:53 ` Neil Brown
2010-08-20 11:51 ` Al Viro
2010-08-21 0:09 ` Neil Brown
2010-08-21 7:13 ` Andreas Dilger
2010-08-21 9:32 ` Aneesh Kumar K. V [this message]
2010-08-22 23:06 ` Neil Brown
2010-08-23 1:24 ` Aneesh Kumar K. V
2010-08-23 1:52 ` Neil Brown
2010-08-24 10:40 ` Aneesh Kumar K. V
2010-08-23 2:49 ` Aneesh Kumar K. V
2010-08-25 2:06 ` Neil Brown
2010-08-24 9:41 ` Bastien ROUCARIES
2010-08-25 2:04 ` Neil Brown
2010-08-25 9:13 ` Bastien ROUCARIES
2010-08-21 8:30 ` Nick Piggin
2010-08-21 9:42 ` Aneesh Kumar K. V
2010-08-22 2:02 ` Aneesh Kumar K. V
2010-08-24 7:21 ` Nick Piggin
2010-08-24 10:34 ` Aneesh Kumar K. V
2010-08-24 13:19 ` J. Bruce Fields
2010-08-22 23:17 ` Neil Brown
2010-08-24 7:29 ` Nick Piggin
2010-08-21 9:31 ` Aneesh Kumar K. V
2010-08-20 13:25 ` Peter Zijlstra
2010-08-20 23:47 ` Neil Brown
2010-08-20 14:38 ` Aneesh Kumar K. V
2010-08-20 1:51 ` [PATCH -V18 05/13] vfs: Support null pathname in readlink Aneesh Kumar K.V
2010-08-20 8:32 ` Christoph Hellwig
2010-08-20 10:04 ` Neil Brown
2010-08-20 14:43 ` Aneesh Kumar K. V
2010-08-20 1:51 ` [PATCH -V18 06/13] vfs: Support null pathname in faccessat Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 07/13] vfs: Support null pathname in linkat Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 08/13] x86: Add new syscalls for x86_32 Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 09/13] x86: Add new syscalls for x86_64 Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 10/13] unistd.h: Add new syscalls numbers to asm-generic Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 11/13] vfs: Export file system uuid via /proc/<pid>/mountinfo Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 12/13] ext3: Copy fs UUID to superblock Aneesh Kumar K.V
2010-08-20 1:51 ` [PATCH -V18 13/13] ext4: " Aneesh Kumar K.V
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