[lvm-devel] LVM2/liblvm .exported_symbols lvm.h lvm_lv.c
wysochanski at sourceware.org
wysochanski at sourceware.org
Sun Jul 26 02:34:36 UTC 2009
CVSROOT: /cvs/lvm2
Module name: LVM2
Changes by: wysochanski at sourceware.org 2009-07-26 02:34:36
Modified files:
liblvm : .exported_symbols lvm.h lvm_lv.c
Log message:
Add lvm_vg_create_lv_linear liblvm function.
Create a default linear logical volume from a volume group.
Author: Dave Wysochanski <dwysocha at redhat.com>
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.8&r2=1.9
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.13&r2=1.14
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_lv.c.diff?cvsroot=lvm2&r1=1.1&r2=1.2
--- LVM2/liblvm/.exported_symbols 2009/07/24 12:48:21 1.8
+++ LVM2/liblvm/.exported_symbols 2009/07/26 02:34:36 1.9
@@ -21,3 +21,4 @@
lvm_vg_list_lvs
lvm_list_vg_names
lvm_list_vg_ids
+lvm_vg_create_lv_linear
--- LVM2/liblvm/lvm.h 2009/07/26 01:54:40 1.13
+++ LVM2/liblvm/lvm.h 2009/07/26 02:34:36 1.14
@@ -97,6 +97,26 @@
int lvm_reload_config(lvm_t libh);
/**
+ * Create a linear logical volume.
+ * This API commits the change to disk and does _not_ require calling
+ * lvm_vg_write.
+ * FIXME: This API should probably not commit to disk but require calling
+ * lvm_vg_write. However, this appears to be non-trivial change until
+ * lv_create_single is refactored by segtype.
+ *
+ * \param vg
+ * VG handle obtained from lvm_vg_create or lvm_vg_open.
+ *
+ * \param name
+ * Name of logical volume to create.
+ *
+ * \param size
+ * Size of logical volume in extents.
+ *
+ */
+lv_t *lvm_vg_create_lv_linear(vg_t *vg, const char *name, uint64_t size);
+
+/**
* Return stored error no describing last LVM API error.
*
* Users of liblvm should use lvm_errno to determine success or failure
--- LVM2/liblvm/lvm_lv.c 2009/07/23 23:40:05 1.1
+++ LVM2/liblvm/lvm_lv.c 2009/07/26 02:34:36 1.2
@@ -16,6 +16,9 @@
#include "lvm.h"
#include "metadata-exported.h"
#include "lvm-string.h"
+#include "defaults.h"
+#include "segtype.h"
+#include <string.h>
char *lvm_lv_get_uuid(const lv_t *lv)
{
@@ -38,3 +41,52 @@
return name;
}
+/* Set defaults for non-segment specific LV parameters */
+static void _lv_set_default_params(struct lvcreate_params *lp,
+ vg_t *vg, const char *lvname,
+ uint64_t extents)
+{
+ lp->zero = 1;
+ lp->major = -1;
+ lp->minor = -1;
+ lp->vg_name = vg->name;
+ lp->lv_name = lvname; /* FIXME: check this for safety */
+ lp->pvh = &vg->pvs;
+
+ lp->extents = extents;
+ lp->permission = LVM_READ | LVM_WRITE;
+ lp->read_ahead = DM_READ_AHEAD_NONE;
+ lp->alloc = ALLOC_INHERIT;
+ lp->tag = NULL;
+}
+
+/* Set default for linear segment specific LV parameters */
+static void _lv_set_default_linear_params(struct cmd_context *cmd,
+ struct lvcreate_params *lp)
+{
+ lp->segtype = get_segtype_from_string(cmd, "striped");
+ lp->stripes = 1;
+ lp->stripe_size = DEFAULT_STRIPESIZE * 2;
+}
+
+lv_t *lvm_vg_create_lv_linear(vg_t *vg, const char *name, uint64_t size)
+{
+ struct lvcreate_params lp;
+ uint64_t extents;
+ struct lv_list *lvl;
+
+ /* FIXME: check for proper VG access */
+ if (vg_read_error(vg))
+ return NULL;
+ memset(&lp, 0, sizeof(lp));
+ extents = extents_from_size(vg->cmd, size, vg->extent_size);
+ _lv_set_default_params(&lp, vg, name, extents);
+ _lv_set_default_linear_params(vg->cmd, &lp);
+ if (!lv_create_single(vg, &lp))
+ return NULL;
+ lvl = find_lv_in_vg(vg, name);
+ if (!lvl)
+ return NULL;
+ return lvl->lv;
+}
+
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