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From: Bastien ROUCARIES <roucaries.bastien@gmail.com>
To: Neil Brown <neilb@suse.de>
Cc: Andreas Dilger <andreas.dilger@oracle.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Christoph Hellwig <hch@infradead.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	"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: Tue, 24 Aug 2010 11:41:10 +0200	[thread overview]
Message-ID: <AANLkTi=vYJDT_6YrfugE1N-k0Sj+abQBw7vQeG1GPhUP@mail.gmail.com> (raw)
In-Reply-To: <20100823090604.6c735c80@notabene>

On Mon, Aug 23, 2010 at 1:06 AM, Neil Brown <neilb@suse.de> wrote:
> 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.

Why ot creating a special file system for this kind of operation ?
I mean a vfsmnt filesystem, with each directory on the root is a
symlink to the root of the real vfsmnt root ?

I could be even be in proc space like /proc/self/vfsmnt

path_to_handle will return a relative path from this directory like
0x75843558/somehandle (if X is on /usr/bin/X and usr is mounted by
filesystem 0x75843558)
path_to_fshandle() will return 0x75843558

opening file handle will be just a matter to thus open
/proc/self/vfsmount/0x75843558/somehandle

Permission will be determined by vfsmount filesystem.

No need to create new syscall all te handle to filename will be handle
by the vfsmount filesystem

We could even use at existing command. The dirfd will need to be only
/proc/self/vfsmnt (and if you need to get a fd without mounting /proc
create a syscall to get this fd).

Does sound plausible ?

Bastien

  parent reply	other threads:[~2010-08-24  9:41 UTC|newest]

Thread overview: 47+ 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
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 [this message]
2010-08-25  2:04                 ` Neil Brown
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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