[ndctl PATCH v2 13/26] ndctl/namespace: Disable autorecovery of create-namespace failures

[Dan Williams <dan.j.williams@intel.com>]

Add an option to disable the behavior of cleaning up namespaces that
failed creation. This is useful for doing forensics on the label and
info-block state after the failure with assurances that the kernel has
not made further modifications.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 Documentation/ndctl/ndctl-create-namespace.txt |    9 +++++++++
 ndctl/namespace.c                              |   13 +++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/Documentation/ndctl/ndctl-create-namespace.txt b/Documentation/ndctl/ndctl-create-namespace.txt
index 343733dedfd9..ed936c87e483 100644
--- a/Documentation/ndctl/ndctl-create-namespace.txt
+++ b/Documentation/ndctl/ndctl-create-namespace.txt
@@ -203,6 +203,15 @@ OPTIONS
 	ndctl init-labels all
 	ndctl enable-region all
 
+-R::
+--autorecover::
+--no-autorecover::
+	By default, if a namespace creation attempt fails, ndctl will
+	cleanup the partially initialized namespace. Use
+	--no-autorecover to disable this behavior for debug and
+	development scenarios where it useful to have the label and
+	info-block state preserved after a failure.
+
 -v::
 --verbose::
 	Emit debug messages for the namespace creation process
diff --git a/ndctl/namespace.c b/ndctl/namespace.c
index a3963d79831a..58fec194ab94 100644
--- a/ndctl/namespace.c
+++ b/ndctl/namespace.c
@@ -43,6 +43,7 @@ static struct parameters {
 	bool mode_default;
 	bool autolabel;
 	bool verify;
+	bool autorecover;
 	bool human;
 	bool json;
 	const char *bus;
@@ -60,6 +61,7 @@ static struct parameters {
 	const char *infile;
 } param = {
 	.autolabel = true,
+	.autorecover = true,
 };
 
 void builtin_xaction_namespace_reset(void)
@@ -84,6 +86,7 @@ struct parsed_parameters {
 	unsigned long sector_size;
 	unsigned long align;
 	bool autolabel;
+	bool autorecover;
 };
 
 #define pr_verbose(fmt, ...) \
@@ -127,7 +130,8 @@ OPT_STRING('t', "type", &param.type, "type", \
 OPT_STRING('a', "align", &param.align, "align", \
 	"specify the namespace alignment in bytes (default: 2M)"), \
 OPT_BOOLEAN('f', "force", &force, "reconfigure namespace even if currently active"), \
-OPT_BOOLEAN('L', "autolabel", &param.autolabel, "automatically initialize labels")
+OPT_BOOLEAN('L', "autolabel", &param.autolabel, "automatically initialize labels"), \
+OPT_BOOLEAN('R', "autorecover", &param.autorecover, "automatically cleanup on failure")
 
 #define CHECK_OPTIONS() \
 OPT_BOOLEAN('R', "repair", &repair, "perform metadata repairs"), \
@@ -444,7 +448,7 @@ static int setup_namespace(struct ndctl_region *region,
 			try(ndctl_pfn, set_align, pfn, p->align);
 		try(ndctl_pfn, set_namespace, pfn, ndns);
 		rc = ndctl_pfn_enable(pfn);
-		if (rc)
+		if (rc && p->autorecover)
 			ndctl_pfn_set_namespace(pfn, NULL);
 	} else if (p->mode == NDCTL_NS_MODE_DAX) {
 		struct ndctl_dax *dax = ndctl_region_get_dax_seed(region);
@@ -455,7 +459,7 @@ static int setup_namespace(struct ndctl_region *region,
 		try(ndctl_dax, set_align, dax, p->align);
 		try(ndctl_dax, set_namespace, dax, ndns);
 		rc = ndctl_dax_enable(dax);
-		if (rc)
+		if (rc && p->autorecover)
 			ndctl_dax_set_namespace(dax, NULL);
 	} else if (p->mode == NDCTL_NS_MODE_SAFE) {
 		struct ndctl_btt *btt = ndctl_region_get_btt_seed(region);
@@ -798,6 +802,7 @@ static int validate_namespace_options(struct ndctl_region *region,
 
 
 	p->autolabel = param.autolabel;
+	p->autorecover = param.autorecover;
 
 	return 0;
 }
@@ -852,7 +857,7 @@ static int namespace_create(struct ndctl_region *region)
 	}
 
 	rc = setup_namespace(region, ndns, &p);
-	if (rc) {
+	if (rc && p.autorecover) {
 		ndctl_namespace_set_enforce_mode(ndns, NDCTL_NS_MODE_RAW);
 		ndctl_namespace_delete(ndns);
 	}

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