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lvm2app: Add lv snapshot support

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Signed-off-by: Tony Asleson <tasleson@redhat.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
This commit is contained in:
Tony Asleson 2012-12-13 17:57:38 -08:00 committed by Andy Grover
parent e8025aa67a
commit 90467a1412
2 changed files with 76 additions and 2 deletions
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21
liblvm/lvm2app.h
View File

@ -1379,6 +1379,27 @@ int lvm_lv_rename(lv_t lv, const char *new_name);
*/
int lvm_lv_resize(const lv_t lv, uint64_t new_size);
/**
* Create a snapshot of a logical volume
*
* \memberof lv_t
*
* \param lv
* Logical volume handle.
*
* \param snap_name
* Name of the snapshot.
*
* \param max_snap_size
* Max snapshot space to use. If you pass zero the same amount of space as
* the origin will be used.
*
* \return
* Valid lv pointer on success, else NULL on error.
*
*/
lv_t lvm_lv_snapshot(const lv_t lv, const char *snap_name, uint64_t max_snap_size);
/************************** physical volume handling ************************/
/**

57
liblvm/lvm_lv.c
View File

@ -122,12 +122,19 @@ static void _lv_set_default_params(struct lvcreate_params *lp,
dm_list_init(&lp->tags);
}
static struct segment_type * _get_segtype(struct cmd_context *cmd) {
struct segment_type *rc = get_segtype_from_string(cmd, "striped");
if (!rc) {
log_error(INTERNAL_ERROR "Segtype striped not found.");
}
return rc;
}
/* Set default for linear segment specific LV parameters */
static int _lv_set_default_linear_params(struct cmd_context *cmd,
struct lvcreate_params *lp)
{
if (!(lp->segtype = get_segtype_from_string(cmd, "striped"))) {
log_error(INTERNAL_ERROR "Segtype striped not found.");
if (!(lp->segtype = _get_segtype(cmd))) {
return 0;
}
@ -306,3 +313,49 @@ int lvm_lv_resize(const lv_t lv, uint64_t new_size)
log_error("NOT IMPLEMENTED YET");
return -1;
}
lv_t lvm_lv_snapshot(const lv_t lv, const char *snap_name, uint64_t max_snap_size)
{
struct lvcreate_params lp = { 0 };
uint64_t extents = 0;
uint64_t size = 0;
struct lv_list *lvl = NULL;
if (vg_read_error(lv->vg))
return NULL;
if (!vg_check_write_mode(lv->vg))
return NULL;
/* Determine the correct size */
if (0 == max_snap_size){
size = lv->size;
} else {
size = max_snap_size >> SECTOR_SHIFT;
if (size > lv->size) {
size = lv->size;
}
}
if (!(extents = extents_from_size(lv->vg->cmd, size,
lv->vg->extent_size))) {
log_error("Unable to create LV snapshot without size.");
return NULL;
}
_lv_set_default_params(&lp, lv->vg, snap_name, extents);
/* Fill out required default input values */
lp.snapshot = 1;
lp.segtype = _get_segtype(lv->vg->cmd);
lp.stripes = 1;
lp.origin = lv->name;
if (!lp.segtype)
return_NULL;
if (!lv_create_single(lv->vg, &lp))
return_NULL;
if (!(lvl = find_lv_in_vg(lv->vg, snap_name)))
return NULL;
return (lv_t) lvl->lv;
}