From 76ee08995eb8271a34c77352ffd499983d6c5752 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Thu, 19 Jan 2012 15:27:54 +0000
Subject: [PATCH] Thin add function to read thin volume percent

This value returns percentage of 'mapped' size compared with total LV size.
(Without passed seg pointer it return highest mapped size - but it's
not used yet.)
---
 lib/activate/activate.c    | 26 ++++++++++++++++++++++++++
 lib/activate/activate.h    |  2 ++
 lib/activate/dev_manager.c | 22 ++++++++++++++++++++++
 lib/activate/dev_manager.h |  3 +++
 lib/thin/thin.c            | 31 +++++++++++++++++++++++++++++++
 5 files changed, 84 insertions(+)

diff --git a/lib/activate/activate.c b/lib/activate/activate.c
index 56dc37c2a..be235b175 100644
--- a/lib/activate/activate.c
+++ b/lib/activate/activate.c
@@ -736,6 +736,32 @@ int lv_thin_pool_percent(const struct logical_volume *lv, int metadata,
 	return r;
 }
 
+/*
+ * Returns 1 if percent set, else 0 on failure.
+ */
+int lv_thin_percent(const struct logical_volume *lv,
+		    int mapped, percent_t *percent)
+{
+	int r;
+	struct dev_manager *dm;
+
+	if (!activation())
+		return 0;
+
+	log_debug("Checking thin percent for LV %s/%s",
+		  lv->vg->name, lv->name);
+
+	if (!(dm = dev_manager_create(lv->vg->cmd, lv->vg->name, 1)))
+		return_0;
+
+	if (!(r = dev_manager_thin_percent(dm, lv, mapped, percent)))
+		stack;
+
+	dev_manager_destroy(dm);
+
+	return r;
+}
+
 static int _lv_active(struct cmd_context *cmd, struct logical_volume *lv)
 {
 	struct lvinfo info;
diff --git a/lib/activate/activate.h b/lib/activate/activate.h
index 64f2ecbee..925876202 100644
--- a/lib/activate/activate.h
+++ b/lib/activate/activate.h
@@ -103,6 +103,8 @@ int lv_mirror_percent(struct cmd_context *cmd, const struct logical_volume *lv,
 int lv_raid_percent(const struct logical_volume *lv, percent_t *percent);
 int lv_thin_pool_percent(const struct logical_volume *lv, int metadata,
 			 percent_t *percent);
+int lv_thin_percent(const struct logical_volume *lv, int mapped,
+		    percent_t *percent);
 
 /*
  * Return number of LVs in the VG that are active.
diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
index c04da5e31..c0adbd7cf 100644
--- a/lib/activate/dev_manager.c
+++ b/lib/activate/dev_manager.c
@@ -895,6 +895,28 @@ int dev_manager_thin_pool_percent(struct dev_manager *dm,
 	return 1;
 }
 
+int dev_manager_thin_percent(struct dev_manager *dm,
+			     const struct logical_volume *lv,
+			     int mapped, percent_t *percent)
+{
+	char *name;
+	const char *dlid;
+
+	/* Build a name for the top layer */
+	if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, NULL)))
+		return_0;
+
+	if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, NULL)))
+		return_0;
+
+	log_debug("Getting device status percentage for %s", name);
+	if (!(_percent(dm, name, dlid, "thin", 0,
+		       (mapped) ? NULL : lv, percent, NULL, 1)))
+		return_0;
+
+	return 1;
+}
+
 /*************************/
 /*  NEW CODE STARTS HERE */
 /*************************/
diff --git a/lib/activate/dev_manager.h b/lib/activate/dev_manager.h
index 417981bd9..e3c73493e 100644
--- a/lib/activate/dev_manager.h
+++ b/lib/activate/dev_manager.h
@@ -57,6 +57,9 @@ int dev_manager_mirror_percent(struct dev_manager *dm,
 int dev_manager_thin_pool_percent(struct dev_manager *dm,
 				  const struct logical_volume *lv,
 				  int metadata, percent_t *percent);
+int dev_manager_thin_percent(struct dev_manager *dm,
+			     const struct logical_volume *lv,
+			     int mapped, percent_t *percent);
 int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv,
 			struct lv_activate_opts *laopts, int lockfs, int flush_required);
 int dev_manager_activate(struct dev_manager *dm, struct logical_volume *lv,
diff --git a/lib/thin/thin.c b/lib/thin/thin.c
index 7f5bfc7f2..8f4976c24 100644
--- a/lib/thin/thin.c
+++ b/lib/thin/thin.c
@@ -409,6 +409,36 @@ static int _thin_add_target_line(struct dev_manager *dm,
 	return 1;
 }
 
+static int _thin_target_percent(void **target_state __attribute__((unused)),
+				percent_t *percent,
+				struct dm_pool *mem,
+				struct cmd_context *cmd __attribute__((unused)),
+				struct lv_segment *seg,
+				char *params,
+				uint64_t *total_numerator,
+				uint64_t *total_denominator)
+{
+	struct dm_status_thin *s;
+
+	/* Status for thin device is in sectors */
+	if (!dm_get_status_thin(mem, params, &s))
+		return_0;
+
+	if (seg) {
+		*percent = make_percent(s->mapped_sectors, seg->lv->size);
+		*total_denominator += seg->lv->size;
+	} else {
+		/* No lv_segment info here */
+		*percent = PERCENT_INVALID;
+		/* FIXME: Using denominator to pass the mapped info upward? */
+		*total_denominator += s->highest_mapped_sector;
+	}
+
+	*total_numerator += s->mapped_sectors;
+
+	return 1;
+}
+
 static int _thin_target_present(struct cmd_context *cmd,
 				const struct lv_segment *seg,
 				unsigned *attributes __attribute__((unused)))
@@ -499,6 +529,7 @@ static struct segtype_handler _thin_ops = {
 	.text_export = _thin_text_export,
 #ifdef DEVMAPPER_SUPPORT
 	.add_target_line = _thin_add_target_line,
+	.target_percent = _thin_target_percent,
 	.target_present = _thin_target_present,
 #  ifdef DMEVENTD
 	.target_monitored = _target_registered,
-- 
2.43.5