Add detection of 'seed' namespaces (ndctl_namespace_is_configuration_idle()) to the enable-namespace operatiuon and libndctl API. In libndctl, return a '1' for seed namespaces. In namespace.c, reinterpret a '1' based on a check for a seed namespace, and decide on skip vs success accordingly. Collect this into a new namespace_enable helper, and make the reported count consistent by also skipping namespaces that were already enabled. Link: https://github.com/pmem/ndctl/issues/119 Reported-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.ibm.com&gt; Cc: Dan Williams <dan.j.williams(a)intel.com&gt; Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com&gt; --- Changes in v2: - The kernel is the ultimate authority on enabling namespaces, so we should let it make the decision of how to handle seed namespaces instead of preemptively skipping them. Let the kernel make that decision, and fix up error reporting after the fact. ndctl/lib/libndctl.c | 9 +++++++-- ndctl/namespace.c | 37 ++++++++++++++++++++++++++++++++++--- 2 files changed, 41 insertions(+), 5 deletions(-) diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c index d6a2800..cde58ff 100644 --- a/ndctl/lib/libndctl.c +++ b/ndctl/lib/libndctl.c @@ -4045,8 +4045,13 @@ NDCTL_EXPORT int ndctl_namespace_enable(struct ndctl_namespace *ndns) return 1; } - err(ctx, "%s: failed to enable\n", devname); - return rc ? rc : -ENXIO; + if (ndctl_namespace_is_configuration_idle(ndns)) { + dbg(ctx, "%s: skip seed namespace\n", devname); + return 1; + } else { + err(ctx, "%s: failed to enable\n", devname); + return rc ? rc : -ENXIO; + } } rc = 0; dbg(ctx, "%s: enabled\n", devname); diff --git a/ndctl/namespace.c b/ndctl/namespace.c index a07d7e2..f2987ca 100644 --- a/ndctl/namespace.c +++ b/ndctl/namespace.c @@ -961,6 +961,36 @@ out: return rc; } +/* + * Adjust the return convention slightly differently from + * ndctl_namespace_enable(). We don't care as much if the enable resulted in + * a different namespace personality being attached. We care more about success, + * failure, or skipped. + * return 0 for success + * return < 0 for failure + * return > 0 for skipped + */ +static int namespace_enable(struct ndctl_namespace *ndns) +{ + int rc; + + if (ndctl_namespace_is_enabled(ndns)) + return 1; + + rc = ndctl_namespace_enable(ndns); + if (rc < 0) + return rc; + + /* + * ndctl_namespace_enable() returns 'success' even for seed namespaces. + * Reinterpret it to determine success vs. skipped. + */ + if (ndctl_namespace_is_configuration_idle(ndns)) + return 1; + + return 0; +} + static int enable_labels(struct ndctl_region *region) { int mappings = ndctl_region_get_mappings(region); @@ -1401,11 +1431,12 @@ static int do_xaction_namespace(const char *namespace, (*processed)++; break; case ACTION_ENABLE: - rc = ndctl_namespace_enable(ndns); - if (rc >= 0) { + rc = namespace_enable(ndns); + if (rc == 0) (*processed)++; + /* return success if skipped */ + if (rc > 0) rc = 0; - } break; case ACTION_DESTROY: rc = namespace_destroy(region, ndns); -- 2.20.1