From owner-svn-src-head@freebsd.org Fri Apr 14 19:41:49 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 81239D3E2C2; Fri, 14 Apr 2017 19:41:49 +0000 (UTC) (envelope-from ngie@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 41DCECBB; Fri, 14 Apr 2017 19:41:49 +0000 (UTC) (envelope-from ngie@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v3EJfmNN003372; Fri, 14 Apr 2017 19:41:48 GMT (envelope-from ngie@FreeBSD.org) Received: (from ngie@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v3EJfmCW003347; Fri, 14 Apr 2017 19:41:48 GMT (envelope-from ngie@FreeBSD.org) Message-Id: <201704141941.v3EJfmCW003347@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: ngie set sender to ngie@FreeBSD.org using -f From: Ngie Cooper Date: Fri, 14 Apr 2017 19:41:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r316938 - head/sbin/savecore X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Apr 2017 19:41:49 -0000 Author: ngie Date: Fri Apr 14 19:41:48 2017 New Revision: 316938 URL: https://svnweb.freebsd.org/changeset/base/316938 Log: savecore: fix space calculation with respect to `minfree` in check_space(..) - Use strtoll(3) instead of atoi(3), because atoi(3) limits the representable data to INT_MAX. Check the values received from strtoll(3), trimming trailing whitespace off the end to maintain POLA. - Use `KiB` instead of `kB` when describing free space, total space, etc. I am now fully aware of `KiB` being the IEC standard for 1024 bytes and `kB` being the IEC standard for 1000 bytes. - Store available number of KiB in `available` so it can be more easily queried and compared to ensure that there are enough KiB to store the dump image on disk. - Print out the reserved space on disk, per `minfree`, so end-users can troubleshoot why check_space(..) is reporting that there isn't enough free space. MFC after: 7 weeks Reviewed by: Anton Rang (earlier diff), cem (earlier diff) Tested with: positive/negative cases (see review); make tinderbox Sponsored by: Dell EMC Isilon Differential Revision: D10379 Modified: head/sbin/savecore/savecore.c Modified: head/sbin/savecore/savecore.c ============================================================================== --- head/sbin/savecore/savecore.c Fri Apr 14 19:18:50 2017 (r316937) +++ head/sbin/savecore/savecore.c Fri Apr 14 19:41:48 2017 (r316938) @@ -68,6 +68,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include @@ -278,7 +279,7 @@ static int check_space(const char *savedir, off_t dumpsize, int bounds) { FILE *fp; - off_t minfree, spacefree, totfree, needed; + off_t available, minfree, spacefree, totfree, needed; struct statfs fsbuf; char buf[100]; @@ -294,19 +295,37 @@ check_space(const char *savedir, off_t d else { if (fgets(buf, sizeof(buf), fp) == NULL) minfree = 0; - else - minfree = atoi(buf); + else { + char *endp; + + errno = 0; + minfree = strtoll(buf, &endp, 10); + if (minfree == 0 && errno != 0) + minfree = -1; + else { + while (*endp != '\0' && isspace(*endp)) + endp++; + if (*endp != '\0' || minfree < 0) + minfree = -1; + } + if (minfree < 0) + syslog(LOG_WARNING, + "`minfree` didn't contain a valid size " + "(`%s`). Defaulting to 0", buf); + } (void)fclose(fp); } + available = minfree > 0 ? spacefree - minfree : totfree; needed = dumpsize / 1024 + 2; /* 2 for info file */ needed -= saved_dump_size(bounds); - if ((minfree > 0 ? spacefree : totfree) - needed < minfree) { + if (available < needed) { syslog(LOG_WARNING, - "no dump: not enough free space on device (%lldkB " - "available; need at least %lldkB)", - (long long)(minfree > 0 ? spacefree : totfree), - (long long)needed); + "no dump: not enough free space on device (need at least " + "%jdKiB for dump; %jdKiB available; %jdKiB reserved)", + (intmax_t)needed, + (intmax_t)available + minfree, + (intmax_t)minfree); return (0); } if (spacefree - needed < 0)