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[lvm-devel] master - missed pool_manip.c



Gitweb:        http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=1d7b2715e51b399dd275a832f488cd712b044844
Commit:        1d7b2715e51b399dd275a832f488cd712b044844
Parent:        998af1a4fbf82cb9d5a2ba0c3c547ede39466a28
Author:        Zdenek Kabelac <zkabelac redhat com>
AuthorDate:    Thu Jan 23 09:56:17 2014 +0100
Committer:     Zdenek Kabelac <zkabelac redhat com>
CommitterDate: Thu Jan 23 09:57:22 2014 +0100

missed pool_manip.c

Seems like this file is missing from the thin_manip move.
Make the tree compilable again.
---
 lib/metadata/pool_manip.c |  305 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 305 insertions(+), 0 deletions(-)

diff --git a/lib/metadata/pool_manip.c b/lib/metadata/pool_manip.c
new file mode 100644
index 0000000..a36c0c7
--- /dev/null
+++ b/lib/metadata/pool_manip.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (C) 2013-2014 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of LVM2.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License v.2.1.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * This file holds common pool functions.
+ */
+
+#include "lib.h"
+#include "activate.h"
+#include "locking.h"
+#include "metadata.h"
+#include "segtype.h"
+#include "lv_alloc.h"
+#include "defaults.h"
+#include "display.h"
+
+int attach_pool_metadata_lv(struct lv_segment *pool_seg,
+			    struct logical_volume *metadata_lv)
+{
+	if (!seg_is_thin_pool(pool_seg)) {
+		log_error(INTERNAL_ERROR
+			  "Unable to attach pool metadata LV to %s segtype.",
+			  pool_seg->segtype->ops->name(pool_seg));
+		return 0;
+	}
+	pool_seg->metadata_lv = metadata_lv;
+	metadata_lv->status |= THIN_POOL_METADATA;
+	lv_set_hidden(metadata_lv);
+
+	return add_seg_to_segs_using_this_lv(metadata_lv, pool_seg);
+}
+
+int attach_pool_data_lv(struct lv_segment *pool_seg,
+			struct logical_volume *pool_data_lv)
+{
+	if (!seg_is_thin_pool(pool_seg)) {
+		log_error(INTERNAL_ERROR
+			  "Unale to attach pool data LV to %s segtype.",
+			  pool_seg->segtype->ops->name(pool_seg));
+		return 0;
+	}
+
+	if (!set_lv_segment_area_lv(pool_seg, 0, pool_data_lv,
+				    0, THIN_POOL_DATA))
+		return_0;
+
+	pool_seg->lv->status |= THIN_POOL;
+	lv_set_hidden(pool_data_lv);
+
+	return 1;
+}
+
+int attach_pool_lv(struct lv_segment *seg,
+		   struct logical_volume *pool_lv,
+		   struct logical_volume *origin,
+		   struct logical_volume *merge_lv)
+{
+	if (!seg_is_thin_volume(seg)) {
+		log_error(INTERNAL_ERROR "Unable to attach pool to %s/%s"
+			  " that is thin volume.",
+			  pool_lv->vg->name, seg->lv->name);
+		return 0;
+	}
+
+	seg->pool_lv = pool_lv;
+	seg->origin = origin;
+	seg->lv->status |= THIN_VOLUME;
+
+	if (origin && !add_seg_to_segs_using_this_lv(origin, seg))
+		return_0;
+
+	if (!add_seg_to_segs_using_this_lv(pool_lv, seg))
+		return_0;
+
+	if (merge_lv) {
+		if (origin != merge_lv) {
+			if (!add_seg_to_segs_using_this_lv(merge_lv, seg))
+				return_0;
+		}
+
+		init_snapshot_merge(seg, merge_lv);
+	}
+
+	return 1;
+}
+
+int detach_pool_lv(struct lv_segment *seg)
+{
+	struct lv_thin_message *tmsg, *tmp;
+	struct seg_list *sl, *tsl;
+	int no_update = 0;
+
+	if (!seg->pool_lv) {
+		log_error(INTERNAL_ERROR
+			  "No pool associated with %s LV, %s.",
+			  seg->segtype->ops->name(seg), seg->lv->name);
+		return 0;
+	}
+
+	if (!lv_is_thin_pool(seg->pool_lv)) {
+		log_error(INTERNAL_ERROR
+			  "Cannot detach pool from LV %s.",
+			  seg->lv->name);
+		return 0;
+	}
+
+	/* Drop any message referencing removed segment */
+	dm_list_iterate_items_safe(tmsg, tmp, &(first_seg(seg->pool_lv)->thin_messages)) {
+		switch (tmsg->type) {
+		case DM_THIN_MESSAGE_CREATE_SNAP:
+		case DM_THIN_MESSAGE_CREATE_THIN:
+			if (tmsg->u.lv == seg->lv) {
+				log_debug_metadata("Discarding message for LV %s.",
+						   tmsg->u.lv->name);
+				dm_list_del(&tmsg->list);
+				no_update = 1; /* Replacing existing */
+			}
+			break;
+		case DM_THIN_MESSAGE_DELETE:
+			if (tmsg->u.delete_id == seg->device_id) {
+				log_error(INTERNAL_ERROR "Trying to delete %u again.",
+					  tmsg->u.delete_id);
+				return 0;
+			}
+			break;
+		default:
+			log_error(INTERNAL_ERROR "Unsupported message type %u.", tmsg->type);
+			break;
+		}
+	}
+
+	if (!detach_thin_external_origin(seg))
+		return_0;
+
+	if (!attach_pool_message(first_seg(seg->pool_lv),
+				 DM_THIN_MESSAGE_DELETE,
+				 NULL, seg->device_id, no_update))
+		return_0;
+
+	if (!remove_seg_from_segs_using_this_lv(seg->pool_lv, seg))
+		return_0;
+
+	if (seg->origin &&
+	    !remove_seg_from_segs_using_this_lv(seg->origin, seg))
+		return_0;
+
+	/* If thin origin, remove it from related thin snapshots */
+	/*
+	 * TODO: map removal of origin as snapshot lvconvert --merge?
+	 * i.e. rename thin snapshot to origin thin origin
+	 */
+	dm_list_iterate_items_safe(sl, tsl, &seg->lv->segs_using_this_lv) {
+		if (!seg_is_thin_volume(sl->seg) ||
+		    (seg->lv != sl->seg->origin))
+			continue;
+
+		if (!remove_seg_from_segs_using_this_lv(seg->lv, sl->seg))
+			return_0;
+		/* Thin snapshot is now regular thin volume */
+		sl->seg->origin = NULL;
+	}
+
+	seg->lv->status &= ~THIN_VOLUME;
+	seg->pool_lv = NULL;
+	seg->origin = NULL;
+
+	return 1;
+}
+
+struct lv_segment *find_pool_seg(const struct lv_segment *seg)
+{
+	struct lv_segment *pool_seg;
+
+	pool_seg = get_only_segment_using_this_lv(seg->lv);
+
+	if (!pool_seg) {
+		log_error("Failed to find pool_seg for %s", seg->lv->name);
+		return NULL;
+	}
+
+	if (!seg_is_thin_pool(pool_seg)) {
+		log_error("%s on %s is not a pool segment.",
+			  pool_seg->lv->name, seg->lv->name);
+		return NULL;
+	}
+
+	return pool_seg;
+}
+
+int create_pool(struct logical_volume *pool_lv,
+		const struct segment_type *segtype,
+		struct alloc_handle *ah, uint32_t stripes, uint32_t stripe_size)
+{
+	const struct segment_type *striped;
+	struct logical_volume *meta_lv, *data_lv;
+	struct lv_segment *seg;
+	char name[NAME_LEN];
+
+	if (pool_lv->le_count) {
+		log_error(INTERNAL_ERROR "Pool %s has already extents.",
+			  pool_lv->name);
+		return 0;
+	}
+
+	/* LV is not yet a pool, so it's extension from lvcreate */
+	if (!(striped = get_segtype_from_string(pool_lv->vg->cmd, "striped")))
+		return_0;
+
+	if (activation() && segtype->ops->target_present &&
+	    !segtype->ops->target_present(pool_lv->vg->cmd, NULL, NULL)) {
+		log_error("%s: Required device-mapper target(s) not "
+			  "detected in your kernel.", segtype->name);
+		return 0;
+	}
+
+	/* Metadata segment */
+	if (!lv_add_segment(ah, stripes, 1, pool_lv, striped, 1, 0, 0))
+		return_0;
+
+	if (!activation())
+		log_warn("WARNING: Pool %s is created without initialization.",
+			 pool_lv->name);
+	else {
+		if (!vg_write(pool_lv->vg) || !vg_commit(pool_lv->vg))
+			return_0;
+
+		/*
+		 * If killed here, only the VISIBLE striped pool LV is left
+		 * and user could easily remove it.
+		 *
+		 * FIXME: implement lazy clearing when activation is disabled
+		 */
+		/* pool_lv is a new LV so the VG lock protects us */
+		if (!activate_lv_local(pool_lv->vg->cmd, pool_lv) ||
+		    /* Clear 4KB of metadata device for new thin-pool. */
+		    !wipe_lv(pool_lv, (struct wipe_params) { .do_zero = 1 })) {
+			log_error("Aborting. Failed to wipe pool metadata %s.",
+				  pool_lv->name);
+			goto bad;
+		}
+	}
+
+	if (dm_snprintf(name, sizeof(name), "%s_%s", pool_lv->name,
+			"tmeta") < 0) {
+		log_error("Name is too long to be a pool name.");
+		goto bad;
+	}
+
+	if (!(meta_lv = lv_create_empty(name, NULL, LVM_READ | LVM_WRITE,
+					ALLOC_INHERIT, pool_lv->vg)))
+		goto_bad;
+
+	if (!move_lv_segments(meta_lv, pool_lv, 0, 0))
+		goto_bad;
+
+	/* Pool data segment */
+	if (!lv_add_segment(ah, 0, stripes, pool_lv, striped, stripe_size, 0, 0))
+		goto_bad;
+
+	if (!(data_lv = insert_layer_for_lv(pool_lv->vg->cmd, pool_lv,
+					    pool_lv->status,
+					    "_tdata")))
+		goto_bad;
+
+	seg = first_seg(pool_lv);
+	/* Drop reference as attach_pool_data_lv() takes it again */
+	if (!remove_seg_from_segs_using_this_lv(data_lv, seg))
+		goto_bad;
+
+	seg->segtype = segtype; /* Set as thin_pool segment */
+
+	if (!attach_pool_data_lv(seg, data_lv))
+		goto_bad;
+
+	if (!attach_pool_metadata_lv(seg, meta_lv))
+		goto_bad;
+
+	return 1;
+
+bad:
+	if (activation()) {
+		if (deactivate_lv_local(pool_lv->vg->cmd, pool_lv)) {
+			log_error("Aborting. Could not deactivate pool %s.",
+				  pool_lv->name);
+			return 0;
+		}
+		if (!lv_remove(pool_lv) ||
+		    !vg_write(pool_lv->vg) || !vg_commit(pool_lv->vg))
+			log_error("Manual intervention may be required to "
+				  "remove abandoned LV(s) before retrying.");
+	}
+
+	return 0;
+}


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