From: Florian Weimer via Libc-alpha <libc-alpha@sourceware.org>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: Alistair Francis <alistair.francis@wdc.com>,
Adhemerval Zanella via Libc-alpha <libc-alpha@sourceware.org>
Subject: Re: [PATCH 16/16] linux: Move xmknoda{at} to compat symbols
Date: Fri, 24 Jul 2020 14:43:02 +0200 [thread overview]
Message-ID: <87pn8l84o9.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <8c431ddc-ffdd-84c7-fa0a-0657cc5b47cc@linaro.org> (Adhemerval Zanella's message of "Fri, 24 Jul 2020 09:34:06 -0300")
* Adhemerval Zanella:
> On 24/07/2020 07:30, Florian Weimer wrote:
>> * Adhemerval Zanella via Libc-alpha:
>>
>>> diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c
>>> new file mode 100644
>>> index 0000000000..d160fe520b
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/mknodat.c
>>> @@ -0,0 +1,41 @@
>>
>>> +int
>>> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)
>>> +{
>>> + /* We must convert the value to dev_t type used by the kernel. */
>>> + unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);
>>> + if (k_dev != *dev)
>>> + return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
>>> +
>>> + return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,
>>> + (unsigned int) k_dev);
>>> +}
>>
>> This looks suspicious yo me. Why use a dev_t * argument? Why check
>> against the unsigned long long int value, when the kernel receives an
>> unsigned int value in the system call?
>
> Because glibc exports dev_t is 64-bit on all architectures (__DEV_T_TYPE),
> while kernel current only accepts 32-bits.
But then the type of k_dev should be unsigned int, I think.
> But I used the dev_t * argument to make it more straightforward to
> implement xmknod{at}. I can change to use a dev_t as well
Yes please.
Thanks,
Florian
next prev parent reply other threads:[~2020-07-24 12:43 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 19:46 [PATCH 00/16] Add y2038 support for stat functions Adhemerval Zanella via Libc-alpha
2020-07-23 19:46 ` [PATCH 01/16] linux: Always define STAT_IS_KERNEL_STAT Adhemerval Zanella via Libc-alpha
2020-07-24 8:17 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 02/16] linux: Define STAT64_IS_KERNEL_STAT64 Adhemerval Zanella via Libc-alpha
2020-07-24 8:20 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 03/16] linux: Consolidate xstat{64} Adhemerval Zanella via Libc-alpha
2020-07-23 20:51 ` Joseph Myers
2020-07-24 8:34 ` Lukasz Majewski
2020-09-09 14:46 ` Lukasz Majewski
2020-09-09 18:05 ` Adhemerval Zanella via Libc-alpha
2020-09-10 7:10 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 04/16] linux: Consolidate lxstat{64} Adhemerval Zanella via Libc-alpha
2020-07-24 8:43 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 05/16] linux: Consolidate fxstat{64} Adhemerval Zanella via Libc-alpha
2020-07-24 9:04 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 06/16] linux: Consolidate fxstatat{64} Adhemerval Zanella via Libc-alpha
2020-07-24 9:14 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 07/16] Linux: Consolidate xmknod Adhemerval Zanella via Libc-alpha
2020-07-24 9:14 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 08/16] Remove internal usage of extensible stat functions Adhemerval Zanella via Libc-alpha
2020-07-24 9:16 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 09/16] Remove stat wrapper functions, move them to exported symbols Adhemerval Zanella via Libc-alpha
2020-07-24 9:23 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 10/16] Remove mknod wrapper functions, move them to symbols Adhemerval Zanella via Libc-alpha
2020-07-23 20:53 ` Joseph Myers
2020-07-23 20:58 ` Adhemerval Zanella via Libc-alpha
2020-07-23 21:01 ` Joseph Myers
2020-07-24 9:25 ` Lukasz Majewski
2020-10-12 22:27 ` Joseph Myers
2020-10-13 0:58 ` Adhemerval Zanella via Libc-alpha
2020-07-23 19:46 ` [PATCH 11/16] linux: Move the struct stat{64} to struct_stat.h Adhemerval Zanella via Libc-alpha
2020-07-24 9:27 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 12/16] linux: Implement {l}fstat{at} in terms of fstatat Adhemerval Zanella via Libc-alpha
2020-07-24 9:29 ` Lukasz Majewski
2020-07-23 19:46 ` [PATCH 13/16] linux: Disentangle fstatat from fxstatat Adhemerval Zanella via Libc-alpha
2020-07-24 9:39 ` Lukasz Majewski
2020-07-24 10:25 ` Florian Weimer via Libc-alpha
2020-07-24 14:39 ` Adhemerval Zanella via Libc-alpha
2020-07-23 19:46 ` [PATCH 14/16] linux: Move {f}xstat{at} to compat symbols Adhemerval Zanella via Libc-alpha
2020-07-24 9:40 ` Lukasz Majewski
2020-10-21 5:21 ` __xstat et al. as compat symbols (was: Re: [PATCH 14/16] linux: Move {f}xstat{at} to compat symbols) Florian Weimer via Libc-alpha
2020-10-21 11:59 ` Adhemerval Zanella via Libc-alpha
2020-10-21 12:57 ` __xstat et al. as compat symbols Florian Weimer via Libc-alpha
2020-10-21 13:09 ` Adhemerval Zanella via Libc-alpha
2020-10-22 10:08 ` Florian Weimer via Libc-alpha
2020-10-22 12:43 ` Adhemerval Zanella via Libc-alpha
2020-10-22 15:37 ` Florian Weimer via Libc-alpha
2020-10-22 16:40 ` Adhemerval Zanella via Libc-alpha
2020-10-22 18:04 ` Adhemerval Zanella via Libc-alpha
2020-07-23 19:46 ` [PATCH 15/16] linux: Add {f}stat{at} y2038 support Adhemerval Zanella via Libc-alpha
2020-07-23 20:55 ` Joseph Myers
2020-07-23 21:00 ` Adhemerval Zanella via Libc-alpha
2020-07-24 10:53 ` Lukasz Majewski
2020-07-30 12:42 ` Adhemerval Zanella via Libc-alpha
2020-08-02 19:46 ` Maciej W. Rozycki via Libc-alpha
2020-10-06 9:48 ` Lukasz Majewski
2020-10-07 12:52 ` Adhemerval Zanella via Libc-alpha
2020-10-07 14:25 ` Adhemerval Zanella via Libc-alpha
2020-10-07 20:20 ` Lukasz Majewski
2020-10-07 21:01 ` Adhemerval Zanella via Libc-alpha
2020-10-07 21:07 ` Adhemerval Zanella via Libc-alpha
2020-10-08 7:57 ` Lukasz Majewski
2020-10-09 14:05 ` Adhemerval Zanella via Libc-alpha
2020-10-09 15:39 ` Lukasz Majewski
2020-10-09 20:06 ` Adhemerval Zanella via Libc-alpha
2020-10-13 13:58 ` Lukasz Majewski
2020-10-13 14:18 ` Adhemerval Zanella via Libc-alpha
2020-10-13 14:23 ` H.J. Lu via Libc-alpha
2020-10-13 14:27 ` Adhemerval Zanella via Libc-alpha
2020-10-13 18:14 ` Adhemerval Zanella via Libc-alpha
2020-10-13 21:20 ` Lukasz Majewski
2020-10-13 21:40 ` Lukasz Majewski
2020-10-14 13:15 ` Lukasz Majewski
2020-10-14 13:39 ` Adhemerval Zanella via Libc-alpha
2020-07-23 19:46 ` [PATCH 16/16] linux: Move xmknoda{at} to compat symbols Adhemerval Zanella via Libc-alpha
2020-07-24 10:30 ` Florian Weimer via Libc-alpha
2020-07-24 12:34 ` Adhemerval Zanella via Libc-alpha
2020-07-24 12:43 ` Florian Weimer via Libc-alpha [this message]
2020-07-24 12:49 ` Adhemerval Zanella via Libc-alpha
2020-07-24 10:43 ` Lukasz Majewski
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