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Add lvm_list_vg_names and lvm_list_vg_ids liblvm functions.

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These functions provide the capability of enumerating all vgnames and
vgids in the system.  They do not do a scan of the system.

Author: Dave Wysochanski <dwysocha@redhat.com>
This commit is contained in:
Dave Wysochanski 2009-07-24 12:47:15 +00:00
parent fd443e0245
commit 122ccd0d04
3 changed files with 43 additions and 0 deletions
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2
liblvm/.exported_symbols
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@ -18,3 +18,5 @@ lvm_errno
lvm_errmsg
lvm_vg_list_pvs
lvm_vg_list_lvs
lvm_list_vg_names
lvm_list_vg_ids

31
liblvm/lvm.h
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@ -44,6 +44,11 @@ typedef struct lvm_lv_list {
lv_t *lv;
} lv_list_t;
struct lvm_str_list {
struct dm_list list;
const char *str;
};
/**
* Return a list of LV handles for a given VG handle.
*
@ -256,4 +261,30 @@ vg_t *lvm_vg_open(lvm_t libh, const char *vgname, const char *mode,
*/
struct dm_list *lvm_vg_list_pvs(vg_t *vg);
/**
* Return a list of VG names or VG uuids in the system.
*
* NOTE: This function will _NOT_ scan devices in the system for LVM metadata.
* To process the list, use the dm_list iterator functions. For example:
* vg_t *vg;
* struct dm_list *vgnames;
* struct lvm_str_list *strl;
*
* vgnames = lvm_list_vg_names(libh);
* dm_list_iterate_items(strl, vgnames) {
* vgname = strl->str;
* vg = lvm_vg_open(libh, vgname, "r");
* // do something with vg
* lvm_vg_close(vg);
* }
*
*
* \return A list of struct lvm_str_list
* If no VGs exist on the system, NULL is returned.
* FIXME: handle list memory cleanup
*/
struct dm_list *lvm_list_vg_names(lvm_t libh);
struct dm_list *lvm_list_vg_ids(lvm_t libh);
#endif /* _LIB_LVM_H */

10
liblvm/lvm_vg.c
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@ -188,3 +188,13 @@ char *lvm_vg_get_name(const vg_t *vg)
name[NAME_LEN] = '\0';
return name;
}
struct dm_list *lvm_list_vg_names(lvm_t libh)
{
return get_vgnames((struct cmd_context *)libh, 0);
}
struct dm_list *lvm_list_vg_ids(lvm_t libh)
{
return get_vgids((struct cmd_context *)libh, 0);
}