[lvm-devel] [PATCH 4/5] Add lvm_lv_get_property() generic function to obtain value of any lv propert
Dave Wysochanski
dwysocha at redhat.com
Fri Oct 22 11:51:09 UTC 2010
Add a generic LV 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_lv.c | 5 +++++
2 files changed, 43 insertions(+), 0 deletions(-)
diff --git a/liblvm/lvm2app.h b/liblvm/lvm2app.h
index 13ece31..59825fb 100644
--- a/liblvm/lvm2app.h
+++ b/liblvm/lvm2app.h
@@ -1032,6 +1032,44 @@ const char *lvm_lv_get_name(const lv_t lv);
uint64_t lvm_lv_get_size(const lv_t lv);
/**
+ * Get the value of a LV property
+ *
+ * \memberof lv_t
+ *
+ * \param lv
+ * Logical volume handle.
+ *
+ * \param name
+ * Name of property to query. See lvs 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 v;
+ * char *prop_name = "seg_count";
+ *
+ * v = lvm_lv_get_property(lv, prop_name);
+ * if (!v.is_valid) {
+ * printf("Invalid property name or unable to query"
+ * "'%s', errno = %d.\n", prop_name, lvm_errno(libh));
+ * return;
+ * }
+ * if (v.is_string)
+ * printf(", value = %s\n", v.value.string);
+ * if (v.is_integer)
+ * printf(", value = %"PRIu64"\n", v.value.integer);
+ *
+ * \return
+ * lvm_property_value structure that will contain the current
+ * value of the property. Caller should check 'is_valid' flag before using
+ * the value. If 'is_valid' is not set, caller should check lvm_errno()
+ * for specific error.
+ */
+struct lvm_property_value lvm_lv_get_property(const lv_t lv, const char *name);
+
+/**
* Get the current activation state of a logical volume.
*
* \memberof lv_t
diff --git a/liblvm/lvm_lv.c b/liblvm/lvm_lv.c
index 7bdafe0..cef87f5 100644
--- a/liblvm/lvm_lv.c
+++ b/liblvm/lvm_lv.c
@@ -48,6 +48,11 @@ const char *lvm_lv_get_name(const lv_t lv)
NAME_LEN+1);
}
+struct lvm_property_value lvm_lv_get_property(const lv_t lv, const char *name)
+{
+ return get_property(NULL, NULL, lv, name);
+}
+
uint64_t lvm_lv_is_active(const lv_t lv)
{
struct lvinfo info;
--
1.7.2.2
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