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From d7a8cd2fdafd168eb1672e7ecde1700463792518 Mon Sep 17 00:00:00 2001
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Message-Id: <d7a8cd2fdafd168eb1672e7ecde1700463792518@dist-git>
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Mon, 1 Jul 2019 17:05:50 +0200
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Subject: [PATCH] vircgroup: Extract file link resolving into separate function
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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(cherry picked from commit 00a0085aa17677003e89cdafceb6a0260af43fb8)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1689297
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Message-Id: <6d3c5594a53824ceac258a0f54162ec8af5aef37.1561993099.git.phrdina@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/util/vircgroup.c | 85 +++++++++++++++++++++++++-------------------
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1 file changed, 48 insertions(+), 37 deletions(-)
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diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
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index 5144b33d43..8ddedbfe7c 100644
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--- a/src/util/vircgroup.c
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+++ b/src/util/vircgroup.c
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@@ -356,6 +356,51 @@ virCgroupCopyMounts(virCgroupPtr group,
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}
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+static int
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+virCgroupResolveMountLink(char *mntDir,
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+ const char *typeStr,
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+ virCgroupControllerPtr controller)
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+{
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+ VIR_AUTOFREE(char *) linkSrc = NULL;
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+ char *dirName;
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+ struct stat sb;
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+
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+ dirName = strrchr(mntDir, '/');
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+ if (!dirName) {
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+ virReportError(VIR_ERR_INTERNAL_ERROR,
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+ _("Missing '/' separator in cgroup mount '%s'"), mntDir);
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+ return -1;
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+ }
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+
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+ if (!strchr(dirName + 1, ','))
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+ return 0;
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+
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+ *dirName = '\0';
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+ if (virAsprintf(&linkSrc, "%s/%s", mntDir, typeStr) < 0)
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+ return -1;
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+ *dirName = '/';
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+
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+ if (lstat(linkSrc, &sb) < 0) {
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+ if (errno == ENOENT) {
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+ VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
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+ typeStr, mntDir, linkSrc);
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+ } else {
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+ virReportSystemError(errno, _("Cannot stat %s"), linkSrc);
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+ return -1;
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+ }
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+ } else {
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+ if (!S_ISLNK(sb.st_mode)) {
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+ VIR_WARN("Expecting a symlink at %s for controller %s",
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+ linkSrc, typeStr);
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+ } else {
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+ VIR_STEAL_PTR(controller->linkPoint, linkSrc);
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+
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/*
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* Process /proc/mounts figuring out what controllers are
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* mounted and where
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@@ -397,8 +442,6 @@ virCgroupDetectMountsFromFile(virCgroupPtr group,
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}
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if (typelen == len && STREQLEN(typestr, tmp, len)) {
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- struct stat sb;
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- char *tmp2;
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/* Note that the lines in /proc/mounts have the same
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* order than the mount operations, and that there may
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@@ -412,44 +455,12 @@ virCgroupDetectMountsFromFile(virCgroupPtr group,
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if (VIR_STRDUP(controller->mountPoint, entry.mnt_dir) < 0)
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goto cleanup;
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- tmp2 = strrchr(entry.mnt_dir, '/');
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- if (!tmp2) {
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- virReportError(VIR_ERR_INTERNAL_ERROR,
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- _("Missing '/' separator in cgroup mount '%s'"),
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- entry.mnt_dir);
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- goto cleanup;
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- }
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-
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/* If it is a co-mount it has a filename like "cpu,cpuacct"
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* and we must identify the symlink path */
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- if (checkLinks && strchr(tmp2 + 1, ',')) {
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- VIR_AUTOFREE(char *) linksrc = NULL;
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-
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- *tmp2 = '\0';
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- if (virAsprintf(&linksrc, "%s/%s",
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- entry.mnt_dir, typestr) < 0)
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+ if (checkLinks &&
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+ virCgroupResolveMountLink(entry.mnt_dir, typestr,
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+ controller) < 0) {
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goto cleanup;
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- *tmp2 = '/';
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-
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- if (lstat(linksrc, &sb) < 0) {
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- if (errno == ENOENT) {
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- VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
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- typestr, entry.mnt_dir, linksrc);
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- } else {
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- virReportSystemError(errno,
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- _("Cannot stat %s"),
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- linksrc);
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- goto cleanup;
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- }
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- } else {
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- if (!S_ISLNK(sb.st_mode)) {
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- VIR_WARN("Expecting a symlink at %s for controller %s",
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- linksrc, typestr);
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- } else {
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- controller->linkPoint = linksrc;
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- linksrc = NULL;
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- }
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- }
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}
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}
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tmp = next;
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--
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2.22.0
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