[ndctl PATCH 4/9] ndctl, list: allow limiting namespace listing

[Dan Williams]

In addition to filtering by bus, dimm, and/or region, introduce
-n/--namespace to limit the listing to the given namespace.

Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
 Documentation/ndctl-list.txt |    6 ++++++
 ndctl/builtin-list.c         |    6 ++++++
 util/filter.c                |   21 +++++++++++++++++++++
 util/filter.h                |    2 ++
 4 files changed, 35 insertions(+)

diff --git a/Documentation/ndctl-list.txt b/Documentation/ndctl-list.txt
index 792eb8e9cadb..2e362e818bbc 100644
--- a/Documentation/ndctl-list.txt
+++ b/Documentation/ndctl-list.txt
@@ -68,6 +68,12 @@ include::xable-region-options.txt[]
 [verse]
 # ndctl list --dimm=nmem0 --namespaces
 
+-n::
+--namespace=::
+       An 'namespaceX.Y' device name, or namespace region plus id tuple
+       'X.Y'. Limit the namespace list to the single identified device
+       if present.
+
 -t::
 --type=::
        Filter listing by region type ('pmem' or 'blk')
diff --git a/ndctl/builtin-list.c b/ndctl/builtin-list.c
index 5c5dc5a5db5b..f7447ea1310f 100644
--- a/ndctl/builtin-list.c
+++ b/ndctl/builtin-list.c
@@ -30,6 +30,7 @@ static struct {
        const char *region;
        const char *type;
        const char *dimm;
+       const char *namespace;
 } param;
 
 static int did_fail;
@@ -55,6 +56,9 @@ static struct json_object *list_namespaces(struct 
ndctl_region *region,
                if (!list.namespaces)
                        break;
 
+               if (!util_namespace_filter(ndns, param.namespace))
+                       continue;
+
                if (!list.idle && !util_namespace_active(ndns))
                        continue;
 
@@ -192,6 +196,8 @@ int cmd_list(int argc, const char **argv)
                                "filter by region"),
                OPT_STRING('d', "dimm", &param.dimm, "dimm-id",
                                "filter by dimm"),
+               OPT_STRING('n', "namespace", &param.namespace, "namespace-id",
+                               "filter by namespace"),
                OPT_STRING('t', "type", &param.type, "region-type",
                                "filter by region-type"),
                OPT_BOOLEAN('B', "buses", &list.buses, "include bus info"),
diff --git a/util/filter.c b/util/filter.c
index ea0f4dd2da13..97f0dec3569c 100644
--- a/util/filter.c
+++ b/util/filter.c
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <limits.h>
@@ -55,6 +56,26 @@ struct ndctl_region *util_region_filter(struct ndctl_region 
*region,
        return NULL;
 }
 
+struct ndctl_namespace *util_namespace_filter(struct ndctl_namespace *ndns,
+               const char *ident)
+{
+       struct ndctl_region *region = ndctl_namespace_get_region(ndns);
+       unsigned long region_id, ndns_id;
+
+       if (!ident || strcmp(ident, "all") == 0)
+               return ndns;
+
+       if (strcmp(ident, ndctl_namespace_get_devname(ndns)) == 0)
+               return ndns;
+
+       if (sscanf(ident, "%ld.%ld", &region_id, &ndns_id) == 2
+                       && ndctl_region_get_id(region) == region_id
+                       && ndctl_namespace_get_id(ndns) == ndns_id)
+               return ndns;
+
+       return NULL;
+}
+
 struct ndctl_dimm *util_dimm_filter(struct ndctl_dimm *dimm, const char *ident)
 {
        char *end = NULL;
diff --git a/util/filter.h b/util/filter.h
index 17ce895425fb..52be4c32d5bf 100644
--- a/util/filter.h
+++ b/util/filter.h
@@ -3,6 +3,8 @@
 struct ndctl_bus *util_bus_filter(struct ndctl_bus *bus, const char *ident);
 struct ndctl_region *util_region_filter(struct ndctl_region *region,
                const char *ident);
+struct ndctl_namespace *util_namespace_filter(struct ndctl_namespace *ndns,
+               const char *ident);
 struct ndctl_dimm *util_dimm_filter(struct ndctl_dimm *dimm, const char 
*ident);
 struct ndctl_bus *util_bus_filter_by_dimm(struct ndctl_bus *bus,
                const char *ident);

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