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Thu, 23 May 2024 19:06:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MOKiHbeTT2bUEQAAD6G6ig (envelope-from ); Thu, 23 May 2024 19:06:31 +0000 From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: berrange@redhat.com, armbru@redhat.com, Peter Xu , Claudio Fontana , Jim Fehlig Subject: [PATCH v2 16/18] io/channel-file: Add direct-io support Date: Thu, 23 May 2024 16:05:46 -0300 Message-Id: <20240523190548.23977-17-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240523190548.23977-1-farosas@suse.de> References: <20240523190548.23977-1-farosas@suse.de> MIME-Version: 1.0 X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_COUNT_TWO(0.00)[2]; DWL_DNSWL_BLOCKED(0.00)[suse.de:dkim]; RCPT_COUNT_FIVE(0.00)[6]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Action: no action X-Rspamd-Queue-Id: 882DE20410 X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Score: -3.01 Received-SPF: pass client-ip=195.135.223.131; envelope-from=farosas@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add support for setting/clearing the O_DIRECT flag on a file descriptor. This will be used for enabling O_DIRECT in the main migration channel when multifd is not in use. Signed-off-by: Fabiano Rosas --- include/io/channel-file.h | 8 ++++++++ io/channel-file.c | 25 +++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/include/io/channel-file.h b/include/io/channel-file.h index d373a4e44d..ecb4450e8e 100644 --- a/include/io/channel-file.h +++ b/include/io/channel-file.h @@ -107,4 +107,12 @@ qio_channel_file_new_path(const char *path, mode_t mode, Error **errp); +/** + * qio_channel_file_set_direct_io: + * @ioc: the QIOChannel object + * @enabled: the desired state of the O_DIRECT flag + * @errp: pointer to initialized error object + */ +void qio_channel_file_set_direct_io(QIOChannel *ioc, bool enabled, + Error **errp); #endif /* QIO_CHANNEL_FILE_H */ diff --git a/io/channel-file.c b/io/channel-file.c index 2ea8d08360..a89cd3a6d5 100644 --- a/io/channel-file.c +++ b/io/channel-file.c @@ -231,6 +231,31 @@ static int qio_channel_file_set_blocking(QIOChannel *ioc, #endif } +void qio_channel_file_set_direct_io(QIOChannel *ioc, bool enabled, Error **errp) +{ +#ifdef O_DIRECT + QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); + int flags = fcntl(fioc->fd, F_GETFL); + + if (flags == -1) { + error_setg_errno(errp, errno, "Unable to read file descriptor flags"); + return; + } + + if (enabled) { + flags |= O_DIRECT; + } else { + flags &= ~O_DIRECT; + } + + if (fcntl(fioc->fd, F_SETFL, flags) == -1) { + error_setg_errno(errp, errno, "Unable to set file descriptor flags"); + return; + } +#else + error_setg(errp, "System does not support O_DIRECT"); +#endif +} static off_t qio_channel_file_seek(QIOChannel *ioc, off_t offset,