From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 4971060EEA for ; Fri, 25 Sep 2020 16:14:01 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 3E72C1C1BA for ; Fri, 25 Sep 2020 16:13:31 +0200 (CEST) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [212.186.127.180]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id 1F7B41C16C for ; Fri, 25 Sep 2020 16:13:29 +0200 (CEST) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id D35EB45791 for ; Fri, 25 Sep 2020 16:13:28 +0200 (CEST) From: Dominik Csapak To: pbs-devel@lists.proxmox.com Date: Fri, 25 Sep 2020 16:13:14 +0200 Message-Id: <20200925141327.25024-2-d.csapak@proxmox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200925141327.25024-1-d.csapak@proxmox.com> References: <20200925141327.25024-1-d.csapak@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL -0.175 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment KAM_LAZY_DOMAIN_SECURITY 1 Sending domain does not have any anti-forgery methods NO_DNS_FOR_FROM 0.379 Envelope sender has no MX or A DNS records RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/, medium trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_NONE 0.001 SPF: sender does not publish an SPF Record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [fs.rs] Subject: [pbs-devel] [PATCH proxmox 1/3] proxmox/tools/fs: add shared lock helper X-BeenThere: pbs-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox Backup Server development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 14:14:01 -0000 Signed-off-by: Dominik Csapak --- proxmox/src/tools/fs.rs | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/proxmox/src/tools/fs.rs b/proxmox/src/tools/fs.rs index b1a95b5..2cd1a1b 100644 --- a/proxmox/src/tools/fs.rs +++ b/proxmox/src/tools/fs.rs @@ -505,15 +505,26 @@ pub fn lock_file( Ok(()) } +/// Open or create a lock file (append mode). Then try to +/// acquire a shared lock using `lock_file()`. +pub fn open_file_locked_shared>(path: P, timeout: Duration) -> Result { + open_file_locked_impl(path, timeout, false) +} + /// Open or create a lock file (append mode). Then try to /// acquire a lock using `lock_file()`. pub fn open_file_locked>(path: P, timeout: Duration) -> Result { + open_file_locked_impl(path, timeout, true) +} + +fn open_file_locked_impl>(path: P, timeout: Duration, exclusive: bool) -> Result { + let path = path.as_ref(); let mut file = match OpenOptions::new().create(true).append(true).open(path) { Ok(file) => file, Err(err) => bail!("Unable to open lock {:?} - {}", path, err), }; - match lock_file(&mut file, true, Some(timeout)) { + match lock_file(&mut file, exclusive, Some(timeout)) { Ok(_) => Ok(file), Err(err) => bail!("Unable to acquire lock {:?} - {}", path, err), } -- 2.20.1