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lvm2app: Add thinp snapshot functionality

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Added parameter object constructor for thinp and
changed the shapshot function to use it.

Signed-off-by: Tony Asleson <tasleson@redhat.com>
This commit is contained in:
Tony Asleson 2013-06-06 16:40:51 -04:00
parent 2a3472b2b3
commit 49e3eecc33
2 changed files with 88 additions and 33 deletions
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21
liblvm/lvm2app.h
View File

@ -1538,7 +1538,26 @@ lv_create_params_t lvm_lv_params_create_thin_pool(vg_t vg,
LVM_THIN_DISCARDS_PASSDOWN)
/**
* Creates the snapshot parameter passing object for the specified lv.
*
* \param lv
* The logical volume to snapshot
*
* \param snap_name
* Name of snapshot
*
* \param max_snap_size
* Used for old snap shots max size, set to zero for thinp
*
* \return
* Valid lv_create_params pointer on success, else NULL on error.
* Note: Memory is associated with the vg, it will get reclaimed when vg is
* closed.
*/
lv_create_params_t lvm_lv_params_create_snapshot(const lv_t lv,
const char *snap_name,
uint64_t max_snap_size);
/**
* Get the specific value of a lv create parameter by name
*

98
liblvm/lvm_lv.c
View File

@ -347,41 +347,16 @@ int lvm_lv_resize(const lv_t lv, uint64_t new_size)
return 0;
}
lv_t lvm_lv_snapshot(const lv_t lv, const char *snap_name, uint64_t max_snap_size)
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;
struct lvm_lv_create_params *lvcp = NULL;
if (vg_read_error(lv->vg))
return NULL;
if (!vg_check_write_mode(lv->vg))
return NULL;
size = max_snap_size >> SECTOR_SHIFT;
if (!(extents = extents_from_size(lv->vg->cmd, size,
lv->vg->extent_size))) {
log_error("Unable to create LV snapshot without size.");
return NULL;
lvcp = lvm_lv_params_create_snapshot(lv, snap_name, max_snap_size);
if (lvcp) {
return lvm_lv_create(lvcp);
}
_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;
}
/* Set defaults for thin pool specific LV parameters */
@ -496,6 +471,67 @@ static void _lv_set_thin_params(struct lvcreate_params *lp,
lp->stripes = 1;
}
lv_create_params_t lvm_lv_params_create_snapshot(const lv_t lv,
const char *snap_name,
uint64_t max_snap_size)
{
uint64_t size = 0;
uint64_t extents = 0;
struct lvm_lv_create_params *lvcp = NULL;
if (vg_read_error(lv->vg)) {
return NULL;
}
if (!vg_check_write_mode(lv->vg))
return NULL;
if (snap_name == NULL || !strlen(snap_name)) {
log_error("snap_name invalid");
return NULL;
}
if (max_snap_size) {
size = max_snap_size >> SECTOR_SHIFT;
extents = extents_from_size(lv->vg->cmd, size, lv->vg->extent_size);
}
if (!size && !lv_is_thin_volume(lv) ) {
log_error("Origin is not thin, specify size of snapshot");
return NULL;
}
lvcp = dm_pool_zalloc(lv->vg->vgmem, sizeof (struct lvm_lv_create_params));
if (lvcp) {
lvcp->vg = lv->vg;
_lv_set_default_params(&lvcp->lvp, lv->vg, snap_name, extents);
lvcp->lvp.snapshot = 1;
if (size) {
lvcp->lvp.segtype = _get_segtype(lvcp->vg->cmd);
lvcp->lvp.chunk_size = 8;
} else {
lvcp->lvp.segtype = get_segtype_from_string(lv->vg->cmd, "thin");
if (!lvcp->lvp.segtype) {
log_error(INTERNAL_ERROR "Segtype thin not found.");
return NULL;
}
lvcp->lvp.pool = first_seg(lv)->pool_lv->name;
}
lvcp->lvp.stripes = 1;
lvcp->lvp.origin = lv->name;
lvcp->magic = LV_CREATE_PARAMS_MAGIC;
}
return lvcp;
}
lv_create_params_t lvm_lv_params_create_thin(const vg_t vg, const char *pool_name,
const char *lvname, uint64_t size)
{