[lvm-devel] [PATCH 6/8] Add lvm_pv_get_property() generic function to obtain value of any pv property.
Dave Wysochanski
dwysocha at redhat.com
Tue Oct 19 11:32:53 UTC 2010
Add a generic PV property function to lvm2app, similar to VG function.
Return lvm_property_value and require caller to check 'is_valid' flag
and lvm_errno() for API error.
Signed-off-by: Dave Wysochanski <dwysocha at redhat.com>
---
liblvm/lvm2app.h | 38 ++++++++++++++++++++++++++++++++++++++
liblvm/lvm_pv.c | 6 ++++++
2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/liblvm/lvm2app.h b/liblvm/lvm2app.h
index 8b244fc..ed22ed9 100644
--- a/liblvm/lvm2app.h
+++ b/liblvm/lvm2app.h
@@ -1240,6 +1240,44 @@ uint64_t lvm_pv_get_size(const pv_t pv);
uint64_t lvm_pv_get_free(const pv_t pv);
/**
+ * Get the value of a PV property
+ *
+ * \memberof pv_t
+ *
+ * \param pv
+ * Physical volume handle.
+ *
+ * \param name
+ * Name of property to query. See pvs man page for full list of properties
+ * that may be queried.
+ *
+ * The memory allocated for a string property value is tied to the vg_t
+ * handle and will be released when lvm_vg_close() is called.
+ *
+ * Example:
+ * lvm_property_value value;
+ * char *prop_name = "pv_mda_count";
+ *
+ * v = lvm_pv_get_property(pv, prop_name);
+ * if (lvm_errno(libh) || !v.is_valid) {
+ * // handle error
+ * printf("Invalid property name or unable to query"
+ * "'%s'.\n", prop_name);
+ * return;
+ * }
+ * if (v.is_string)
+ * printf(", value = %s\n", v.value.string);
+ * else
+ * printf(", value = %"PRIu64"\n", v.value.integer);
+ *
+ * \return
+ * lvm_property_value structure that will contain the current
+ * value of the property. Caller should check lvm_errno() as well
+ * as 'is_valid' flag before using the value.
+ */
+struct lvm_property_value lvm_pv_get_property(const pv_t pv, const char *name);
+
+/**
* Resize physical volume to new_size bytes.
*
* \memberof pv_t
diff --git a/liblvm/lvm_pv.c b/liblvm/lvm_pv.c
index 0b6b6b1..efdccb5 100644
--- a/liblvm/lvm_pv.c
+++ b/liblvm/lvm_pv.c
@@ -16,6 +16,7 @@
#include "lvm2app.h"
#include "metadata.h"
#include "lvm-string.h"
+#include "lvm_misc.h"
const char *lvm_pv_get_uuid(const pv_t pv)
{
@@ -48,6 +49,11 @@ uint64_t lvm_pv_get_free(const pv_t pv)
return (uint64_t) SECTOR_SIZE * pv_free(pv);
}
+struct lvm_property_value lvm_pv_get_property(const pv_t pv, const char *name)
+{
+ return get_property(pv, NULL, NULL, name);
+}
+
int lvm_pv_resize(const pv_t pv, uint64_t new_size)
{
/* FIXME: add pv resize code here */
--
1.7.2.2
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