[lvm-devel] [PATCH 1/3] Add vg_reduce to metadata.c and metadata-exported.h
Thomas Woerner
twoerner at redhat.com
Mon Jul 27 13:12:35 UTC 2009
This function behaves a little bit different than vg_reduce_single, because
it allowes to remove even the latest pv. This has been done to be consistent
to lvm_vg_create, which creates an empty vg.
removed_pvs has been added to the volume_group struct. vg_reduce adds removed
pvs to this list to be able to commit the changes for the pvs in lvm_vg_commit
in liblvm2app.
Signed-off-by: Thomas Woerner <twoerner at redhat.com>
---
lib/metadata/metadata-exported.h | 7 ++++
lib/metadata/metadata.c | 61 ++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+), 0 deletions(-)
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 142381b..bc946da 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -243,6 +243,12 @@ struct volume_group {
*/
/*
+ * List of removed physical volumes by pvreduce.
+ * They have to get cleared on vg_commit.
+ */
+ struct dm_list removed_pvs;
+
+ /*
* Store result of the last vg_read().
* 0 for success else appropriate FAILURE_* bits set.
*/
@@ -437,6 +443,7 @@ int vg_remove_single(vg_t *vg);
int vg_rename(struct cmd_context *cmd, struct volume_group *vg,
const char *new_name);
int vg_extend(struct volume_group *vg, int pv_count, char **pv_names);
+int vg_reduce(struct volume_group *vg, char *pv_name);
int vg_set_extent_size(vg_t *vg, uint32_t new_extent_size);
int vg_set_max_lv(vg_t *vg, uint32_t max_lv);
int vg_set_max_pv(vg_t *vg, uint32_t max_pv);
diff --git a/lib/metadata/metadata.c b/lib/metadata/metadata.c
index 838add8..fb6f91b 100644
--- a/lib/metadata/metadata.c
+++ b/lib/metadata/metadata.c
@@ -532,6 +532,63 @@ int vg_extend(struct volume_group *vg, int pv_count, char **pv_names)
return 0;
}
+int vg_reduce(struct volume_group *vg, char *pv_name)
+{
+ struct physical_volume *pv;
+ struct cmd_context *cmd = vg->cmd;
+ struct pv_list *pvl;
+
+ if (_vg_bad_status_bits(vg, RESIZEABLE_VG))
+ return 0;
+
+ if (!lock_vol(cmd, VG_ORPHANS, LCK_VG_WRITE)) {
+ log_error("Can't get lock for orphan PVs");
+ return 0;
+ }
+
+ if (!archive(vg))
+ goto bad;
+
+ /* remove each pv */
+ if (!(pvl = find_pv_in_vg(vg, pv_name))) {
+ log_error("Physical volume %s not in volume group %s.",
+ pv_name, vg->name);
+ goto bad;
+ }
+
+ pv = pvl->pv;
+
+ if (pv_pe_alloc_count(pv)) {
+ log_error("Physical volume %s still in use.",
+ pv_name);
+ goto bad;
+ }
+
+ if (!dev_get_size(pv_dev(pv), &pv->size)) {
+ log_error("%s: Couldn't get size.", pv_name);
+ goto bad;
+ }
+
+ vg->pv_count--;
+ vg->free_count -= pv_pe_count(pv) - pv_pe_alloc_count(pv);
+ vg->extent_count -= pv_pe_count(pv);
+
+ /* add pv to the remove_pvs list */
+ dm_list_del(&pvl->list);
+ dm_list_add(&vg->removed_pvs, &pvl->list);
+
+ unlock_vg(cmd, VG_ORPHANS);
+ return 1;
+
+ bad:
+ log_error("Unable to add physical volume '%s' to "
+ "volume group '%s'.", pv_name, vg->name);
+ unlock_vg(cmd, VG_ORPHANS);
+ if (pvl)
+ dm_list_del(&pvl->list);
+ return 0;
+}
+
const char *strip_dir(const char *vg_name, const char *dev_dir)
{
size_t len = strlen(dev_dir);
@@ -660,6 +717,9 @@ vg_t *vg_create(struct cmd_context *cmd, const char *vg_name)
dm_list_init(&vg->tags);
+ /* initialize removed_pvs list */
+ dm_list_init(&vg->removed_pvs);
+
if (!(vg->fid = cmd->fmt->ops->create_instance(cmd->fmt, vg_name,
NULL, NULL))) {
log_error("Failed to create format instance");
@@ -2165,6 +2225,7 @@ static struct volume_group *_vg_read_orphans(struct cmd_context *cmd,
dm_list_init(&vg->pvs);
dm_list_init(&vg->lvs);
dm_list_init(&vg->tags);
+ dm_list_init(&vg->removed_pvs);
vg->vgmem = mem;
vg->cmd = cmd;
if (!(vg->name = dm_pool_strdup(mem, orphan_vgname))) {
--
1.6.2.5
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