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To: "Eric W. Biederman" Cc: Linux Containers , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, khlebnikov@yandex-team.ru, prakash.sangappa@oracle.com, luto@kernel.org, akpm@linux-foundation.org, oleg@redhat.com, serge.hallyn@ubuntu.com, esyr@redhat.com, jannh@google.com, linux-security-module@vger.kernel.org, Pavel Emelyanov References: <87vadmobdw.fsf_-_@xmission.com> <20180323191614.32489-9-ebiederm@xmission.com> <7df62190-2407-bfd4-d144-7304a8ea8ae3@oracle.com> <87lgeio4tb.fsf@xmission.com> <1091a91e-f8ee-b091-6d95-78b33520fb2d@oracle.com> <87woxvajk9.fsf@xmission.com> From: Nagarathnam Muthusamy Message-ID: Date: Wed, 28 Mar 2018 16:18:49 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: <87woxvajk9.fsf@xmission.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8846 signatures=668695 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=761 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1803280233 Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 03/28/2018 04:04 PM, ebiederm@xmission.com wrote: > NAGARATHNAM MUTHUSAMY writes: > >> On 3/23/2018 2:33 PM, ebiederm@xmission.com wrote: >>> NAGARATHNAM MUTHUSAMY writes: >>> >>>> Thanks! >>>> >>>> Reviewed-by: Nagarathnam Muthusamy >>> Does this look like it will address the issue you have been fighting >>> with pids? >> We do use IPC shared memory but it is a single large one, shared by multiple >> levels. We are currently looking into using a similar solution based on file >> locks. >> When a new level is created, a file representing that level could be created in >> a common path which could be locked by the init process of that level. >> Parent levels could query the locking pid of that file to get the pid >> translation >> of the init process of the required level. Then it could open a file descriptor >> and use the translate_pid API for further translations. > Do you want to resend the translate_pid API with file descriptors as it > was in the lwn article? That I will apply. Sure Eric! We are currently implementing and testing the file locks + FD based approach, just to make sure it covers all the requirements. Will resend the patch with FD based translate_pid API in few days. Thanks, Nagarathnam. > > Eric