Re: [PATCH] virdevmapper: Ignore all errors when opening /dev/mapper/control

So far, only ENOENT is ignored (to deal with kernels without devmapper). However, as reported on the list, under certain scenarios a different error can occur. For instance, when libvirt is running inside a container which doesn't have permissions to talk to the devmapper. If this is the case, then open() returns -1 and sets errno=EPERM. Assuming that multipath devices are fairly narrow use case and using them in a restricted container is even more narrow the best fix seems to be to ignore all open errors BUT produce a warning on failure. To avoid flooding logs with warnings on kernels without devmapper the level is reduced to a plain debug message.

Reported-by: Christian Ehrhardt <christian.ehrhardt(a)canonical.com&gt; Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/util/virdevmapper.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c index 3cc399f382..7c89c2a952 100644 --- a/src/util/virdevmapper.c +++ b/src/util/virdevmapper.c @@ -35,9 +35,12 @@ # include "viralloc.h" # include "virstring.h" # include "virfile.h" +# include "virlog.h" # define VIR_FROM_THIS VIR_FROM_STORAGE +VIR_LOG_INIT("util.virdevmapper"); + # define PROC_DEVICES "/proc/devices" # define DM_NAME "device-mapper" # define DEV_DM_DIR "/dev/" DM_DIR @@ -130,11 +133,15 @@ virDMOpen(void) memset(&dm, 0, sizeof(dm)); if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0) { - if (errno == ENOENT) - return -2; - - virReportSystemError(errno, _("Unable to open %s"), CONTROL_PATH); - return -1; + /* We can't talk to devmapper. Produce a warning and let + * the caller decide what to do next. */ + if (errno == ENOENT) { + VIR_DEBUG("device mapper not available"); + } else { + VIR_WARN("unable to open %s: %s", + CONTROL_PATH, g_strerror(errno)); + } + return -2; } if (!virDMIoctl(controlFD, DM_VERSION, &dm, &tmp)) { @@ -309,9 +316,9 @@ virDevMapperGetTargets(const char *path, if ((controlFD = virDMOpen()) < 0) { if (controlFD == -2) { - /* The CONTROL_PATH doesn't exist. Probably the - * module isn't loaded, yet. Don't error out, just - * exit. */ + /* The CONTROL_PATH doesn't exist or is unusable. + * Probably the module isn't loaded, yet. Don't error + * out, just exit. */ return 0; } -- 2.26.2