From: Fabiano Rosas <farosas@suse.de>
To: Peter Xu <peterx@redhat.com>
Cc: qemu-devel@nongnu.org, berrange@redhat.com, armbru@redhat.com,
Juan Quintela <quintela@redhat.com>,
Leonardo Bras <leobras@redhat.com>,
Claudio Fontana <cfontana@suse.de>
Subject: Re: [RFC PATCH v3 04/30] io: fsync before closing a file channel
Date: Thu, 11 Jan 2024 15:46:02 -0300 [thread overview]
Message-ID: <87wmsfn1xx.fsf@suse.de> (raw)
In-Reply-To: <ZZ-qbom2UqEX0uS7@x1n>
Peter Xu <peterx@redhat.com> writes:
> On Mon, Nov 27, 2023 at 05:25:46PM -0300, Fabiano Rosas wrote:
>> Make sure the data is flushed to disk before closing file
>> channels. This will ensure data is on disk at the end of a migration
>> to file.
>
> Looks reasonable, but just two (possibly naive) questions:
>
> (1) Does this apply to all io channel users, or only migration?
All file channel users.
>
> (2) Why metadata doesn't matter (v.s. fsync(), when CONFIG_FDATASYNC=y)?
Syncing the inode information is not critical, it's mostly timestamp
information (man inode). And fdatasync makes sure to sync any metadata
that would be relevant for the retrieval of the data.
>
> Thanks,
next prev parent reply other threads:[~2024-01-11 18:47 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-27 20:25 [RFC PATCH v3 00/30] migration: File based migration with multifd and fixed-ram Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 01/30] io: add and implement QIO_CHANNEL_FEATURE_SEEKABLE for channel file Fabiano Rosas
2024-01-10 8:49 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 02/30] io: Add generic pwritev/preadv interface Fabiano Rosas
2024-01-10 9:07 ` Daniel P. Berrangé
2024-01-11 6:59 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 03/30] io: implement io_pwritev/preadv for QIOChannelFile Fabiano Rosas
2024-01-10 9:08 ` Daniel P. Berrangé
2024-01-11 7:04 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 04/30] io: fsync before closing a file channel Fabiano Rosas
2024-01-10 9:04 ` Daniel P. Berrangé
2024-01-11 8:44 ` Peter Xu
2024-01-11 18:46 ` Fabiano Rosas [this message]
2024-01-12 0:01 ` Peter Xu
2024-01-12 10:40 ` Daniel P. Berrangé
2024-01-15 3:38 ` Peter Xu
2024-01-15 8:57 ` Peter Xu
2024-01-15 9:03 ` Daniel P. Berrangé
2024-01-15 9:31 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 05/30] migration/qemu-file: add utility methods for working with seekable channels Fabiano Rosas
2024-01-11 9:57 ` Peter Xu
2024-01-11 18:49 ` Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 06/30] migration/ram: Introduce 'fixed-ram' migration capability Fabiano Rosas
2023-12-22 10:35 ` Markus Armbruster
2024-01-11 10:43 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 07/30] migration: Add fixed-ram URI compatibility check Fabiano Rosas
2024-01-15 9:01 ` Peter Xu
2024-01-23 19:07 ` Fabiano Rosas
2024-01-23 19:07 ` Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 08/30] migration/ram: Add outgoing 'fixed-ram' migration Fabiano Rosas
2024-01-15 9:28 ` Peter Xu
2024-01-15 14:50 ` Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 09/30] migration/ram: Add incoming " Fabiano Rosas
2024-01-15 9:49 ` Peter Xu
2024-01-15 16:43 ` Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 10/30] tests/qtest: migration-test: Add tests for fixed-ram file-based migration Fabiano Rosas
2024-01-15 10:01 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 11/30] migration/multifd: Allow multifd without packets Fabiano Rosas
2024-01-15 11:51 ` Peter Xu
2024-01-15 18:39 ` Fabiano Rosas
2024-01-15 23:01 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 12/30] migration/multifd: Allow QIOTask error reporting without an object Fabiano Rosas
2024-01-15 12:06 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 13/30] migration/multifd: Add outgoing QIOChannelFile support Fabiano Rosas
2024-01-16 4:05 ` Peter Xu
2024-01-16 7:25 ` Peter Xu
2024-01-16 13:37 ` Fabiano Rosas
2024-01-17 8:28 ` Peter Xu
2024-01-17 17:34 ` Fabiano Rosas
2024-01-18 7:11 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 14/30] migration/multifd: Add incoming " Fabiano Rosas
2024-01-16 6:29 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 15/30] io: Add a pwritev/preadv version that takes a discontiguous iovec Fabiano Rosas
2024-01-16 6:58 ` Peter Xu
2024-01-16 18:15 ` Fabiano Rosas
2024-01-17 9:48 ` Peter Xu
2024-01-17 18:06 ` Fabiano Rosas
2024-01-18 7:44 ` Peter Xu
2024-01-18 12:47 ` Fabiano Rosas
2024-01-19 0:22 ` Peter Xu
2024-01-17 12:39 ` Daniel P. Berrangé
2024-01-17 14:27 ` Daniel P. Berrangé
2024-01-17 18:09 ` Fabiano Rosas
2023-11-27 20:25 ` [RFC PATCH v3 16/30] multifd: Rename MultiFDSendParams::data to compress_data Fabiano Rosas
2024-01-16 7:03 ` Peter Xu
2023-11-27 20:25 ` [RFC PATCH v3 17/30] migration/multifd: Decouple recv method from pages Fabiano Rosas
2024-01-16 7:23 ` Peter Xu
2023-11-27 20:26 ` [RFC PATCH v3 18/30] migration/multifd: Allow receiving pages without packets Fabiano Rosas
2024-01-16 8:10 ` Peter Xu
2024-01-16 20:25 ` Fabiano Rosas
2024-01-19 0:20 ` Peter Xu
2024-01-19 12:57 ` Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 19/30] migration/ram: Ignore multifd flush when doing fixed-ram migration Fabiano Rosas
2024-01-16 8:23 ` Peter Xu
2024-01-17 18:13 ` Fabiano Rosas
2024-01-19 1:33 ` Peter Xu
2023-11-27 20:26 ` [RFC PATCH v3 20/30] migration/multifd: Support outgoing fixed-ram stream format Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 21/30] migration/multifd: Support incoming " Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 22/30] tests/qtest: Add a multifd + fixed-ram migration test Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 23/30] migration: Add direct-io parameter Fabiano Rosas
2023-12-22 10:38 ` Markus Armbruster
2023-11-27 20:26 ` [RFC PATCH v3 24/30] tests/qtest: Add a test for migration with direct-io and multifd Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 25/30] monitor: Honor QMP request for fd removal immediately Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 26/30] monitor: Extract fdset fd flags comparison into a function Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 27/30] monitor: fdset: Match against O_DIRECT Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 28/30] docs/devel/migration.rst: Document the file transport Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 29/30] migration: Add support for fdset with multifd + file Fabiano Rosas
2023-11-27 20:26 ` [RFC PATCH v3 30/30] tests/qtest: Add a test for fixed-ram with passing of fds Fabiano Rosas
2024-01-11 10:50 ` [RFC PATCH v3 00/30] migration: File based migration with multifd and fixed-ram Peter Xu
2024-01-11 18:38 ` Fabiano Rosas
2024-01-15 6:22 ` Peter Xu
2024-01-15 8:11 ` Daniel P. Berrangé
2024-01-15 8:41 ` Peter Xu
2024-01-15 19:45 ` Fabiano Rosas
2024-01-15 23:20 ` Peter Xu
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