From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: NeilBrown <neilb@suse.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Peter Zijlstra <peterz@infradead.org>,
Dmitry Safonov <dsafonov@virtuozzo.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
Brian Gerst <brgerst@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-tip-commits@vger.kernel.org, jsimmons@infradead.org
Subject: Re: in_compat_syscall() returns from kernel thread for X86_32.
Date: Wed, 24 Oct 2018 09:15:34 -0400 [thread overview]
Message-ID: <20181024131534.GD11606@thunk.org> (raw)
In-Reply-To: <871s8g6roy.fsf@notabene.neil.brown.name>
On Wed, Oct 24, 2018 at 12:47:57PM +1100, NeilBrown wrote:
>
> I doubt it was copied - more likely independent evolution.
> But on reflection, I see that it is probably reasonable that it
> shouldn't be used this way - or at all in this context.
> I'll try to understand what the issues really are and see if I can
> find a solution that doesn't depend on this interface.
> Thanks for your help.
At least for ext4, the primary problem is that we want to use a 64-bit
telldir/seekdir cookie if all 64-bits will make it to user space, and
a 32-bit telldir cookie if only 32 bits will make it userspace. This
impacts NFS as well because if there are people who are still using
NFSv2, which has 32-bit directory offsets, we need to constrain the
telldir/seekdir cookies we give to NFS to be a 32 has as opposed to a
64-bit hash.
- Ted
next prev parent reply other threads:[~2018-10-24 13:16 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-11 15:22 [PATCH] x86/vdso: add mremap hook to vm_special_mapping Dmitry Safonov
2016-04-11 15:22 ` Dmitry Safonov
2016-04-11 15:41 ` kbuild test robot
2016-04-11 15:41 ` kbuild test robot
2016-04-11 15:54 ` Dmitry Safonov
2016-04-11 15:54 ` Dmitry Safonov
2016-04-14 16:32 ` [PATCHv2] " Dmitry Safonov
2016-04-14 16:32 ` Dmitry Safonov
2016-04-14 22:58 ` Andy Lutomirski
2016-04-14 22:58 ` Andy Lutomirski
2016-04-15 8:46 ` Dmitry Safonov
2016-04-15 8:46 ` Dmitry Safonov
2016-04-15 9:18 ` Ingo Molnar
2016-04-15 9:18 ` Ingo Molnar
2016-04-15 9:51 ` Dmitry Safonov
2016-04-15 9:51 ` Dmitry Safonov
2016-04-15 12:08 ` Dmitry Safonov
2016-04-15 12:08 ` Dmitry Safonov
2016-04-15 13:20 ` [PATCHv3 1/2] " Dmitry Safonov
2016-04-15 13:20 ` Dmitry Safonov
2016-04-15 13:20 ` [PATCHv3 2/2] x86: rename is_{ia32,x32}_task to in_{ia32,x32}_syscall Dmitry Safonov
2016-04-15 13:20 ` Dmitry Safonov
2016-04-15 16:52 ` Andy Lutomirski
2016-04-15 16:52 ` Andy Lutomirski
2016-04-15 16:55 ` Dmitry Safonov
2016-04-15 16:55 ` Dmitry Safonov
2016-04-15 13:53 ` [PATCHv3 1/2] x86/vdso: add mremap hook to vm_special_mapping kbuild test robot
2016-04-15 13:53 ` kbuild test robot
2016-04-15 14:12 ` [PATCHv4 " Dmitry Safonov
2016-04-15 14:12 ` Dmitry Safonov
2016-04-15 14:12 ` [PATCHv4 2/2] x86: rename is_{ia32,x32}_task to in_{ia32,x32}_syscall Dmitry Safonov
2016-04-15 14:12 ` Dmitry Safonov
2016-04-15 16:58 ` [PATCHv4 1/2] x86/vdso: add mremap hook to vm_special_mapping Andy Lutomirski
2016-04-15 16:58 ` Andy Lutomirski
2016-04-18 11:18 ` Dmitry Safonov
2016-04-18 11:18 ` Dmitry Safonov
2016-04-18 15:37 ` Andy Lutomirski
2016-04-18 15:37 ` Andy Lutomirski
2016-04-18 13:43 ` [PATCHv5 1/3] x86: rename is_{ia32,x32}_task to in_{ia32,x32}_syscall Dmitry Safonov
2016-04-18 13:43 ` Dmitry Safonov
2016-04-18 13:43 ` [PATCHv5 2/3] x86/vdso: add mremap hook to vm_special_mapping Dmitry Safonov
2016-04-18 13:43 ` Dmitry Safonov
2016-04-18 14:03 ` kbuild test robot
2016-04-18 14:03 ` kbuild test robot
2016-04-18 14:17 ` [PATCHv6 " Dmitry Safonov
2016-04-18 14:17 ` Dmitry Safonov
2016-04-18 14:23 ` [PATCHv7 " Dmitry Safonov
2016-04-18 14:23 ` Dmitry Safonov
2016-04-20 16:22 ` Dmitry Safonov
2016-04-20 16:22 ` Dmitry Safonov
2016-04-21 19:52 ` Andy Lutomirski
2016-04-21 19:52 ` Andy Lutomirski
2016-04-22 10:45 ` Dmitry Safonov
2016-04-22 10:45 ` Dmitry Safonov
2016-04-23 23:09 ` [PATCHv5 " kbuild test robot
2016-04-23 23:09 ` kbuild test robot
2016-04-18 13:43 ` [PATCHv5 3/3] selftest/x86: add mremap vdso 32-bit test Dmitry Safonov
2016-04-18 13:43 ` Dmitry Safonov
2016-04-21 20:01 ` Andy Lutomirski
2016-04-21 20:01 ` Andy Lutomirski
2016-04-22 11:34 ` Dmitry Safonov
2016-04-22 11:34 ` Dmitry Safonov
2016-04-19 9:34 ` [tip:x86/asm] x86/entry: Rename is_{ia32,x32}_task() to in_{ia32,x32}_syscall() tip-bot for Dmitry Safonov
2016-04-19 11:15 ` Ingo Molnar
2016-04-19 11:35 ` Borislav Petkov
2016-04-19 17:00 ` H. Peter Anvin
2016-04-19 16:04 ` Andy Lutomirski
2016-04-22 8:36 ` Ingo Molnar
2018-10-18 1:47 ` in_compat_syscall() returns from kernel thread for X86_32 NeilBrown
2018-10-18 2:37 ` Andy Lutomirski
2018-10-18 2:49 ` Al Viro
2018-10-18 4:36 ` NeilBrown
2018-10-18 17:26 ` Andy Lutomirski
2018-10-20 6:02 ` Andreas Dilger
2018-10-20 7:58 ` Andy Lutomirski
2018-10-24 1:47 ` NeilBrown
2018-10-24 13:15 ` Theodore Y. Ts'o [this message]
2018-10-24 14:32 ` Theodore Y. Ts'o
2019-01-11 22:21 ` Pavel Machek
2018-10-25 3:46 ` NeilBrown
2018-10-25 4:45 ` Andy Lutomirski
2016-04-25 11:37 ` [PATCHv8 1/2] x86/vdso: add mremap hook to vm_special_mapping Dmitry Safonov
2016-04-25 11:37 ` Dmitry Safonov
2016-04-25 11:37 ` [PATCHv8 2/2] selftest/x86: add mremap vdso test Dmitry Safonov
2016-04-25 11:37 ` Dmitry Safonov
2016-04-25 21:39 ` Andy Lutomirski
2016-04-25 21:39 ` Andy Lutomirski
2016-04-25 21:38 ` [PATCHv8 1/2] x86/vdso: add mremap hook to vm_special_mapping Andy Lutomirski
2016-04-25 21:38 ` Andy Lutomirski
2016-05-05 11:09 ` Dmitry Safonov
2016-05-05 11:52 ` Ingo Molnar
2016-05-05 11:52 ` Ingo Molnar
2016-05-05 11:55 ` Dmitry Safonov
2016-05-05 11:55 ` Dmitry Safonov
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