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Add lvm_vg_create_lv_linear liblvm function.

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Create a default linear logical volume from a volume group.


Author: Dave Wysochanski <dwysocha@redhat.com>
This commit is contained in:
Dave Wysochanski 2009-07-26 02:34:36 +00:00
parent 9963d0710e
commit 7a35a9f5d8
3 changed files with 73 additions and 0 deletions
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1
liblvm/.exported_symbols
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@ -21,3 +21,4 @@ lvm_vg_list_pvs
lvm_vg_list_lvs
lvm_list_vg_names
lvm_list_vg_ids
lvm_vg_create_lv_linear

20
liblvm/lvm.h
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@ -96,6 +96,26 @@ void lvm_destroy(lvm_t libh);
*/
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.
*

52
liblvm/lvm_lv.c
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@ -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 @@ char *lvm_lv_get_name(const lv_t *lv)
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;
}