report: raid enhancements for --select

Enhance the raid report functions for the recently added LV fields
reshape_len, reshape_len_le, data_offset, new_data_offset, data_copies,
data_stripes and parity_chunks to cope with "lvs --select".

Related: rhbz834579
Related: rhbz1191935
Related: rhbz1191978

lib/metadata/lv.c

@@ -1104,6 +1104,19 @@ int lv_raid_healthy(const struct logical_volume *lv)
 	return 1;
 }
 
+/* Helper: check for any sub LVs after a disk removing reshape */
+static int _sublvs_remove_after_reshape(const struct logical_volume *lv)
+{
+	uint32_t s;
+	struct lv_segment *seg = first_seg(lv);
+
+	for (s = seg->area_count -1; s; s--)
+		if (seg_lv(seg, s)->status & LV_REMOVE_AFTER_RESHAPE)
+			return 1;
+
+	return 0;
+}
+
 char *lv_attr_dup_with_info_and_seg_status(struct dm_pool *mem, const struct lv_with_info_and_seg_status *lvdm)
 {
 	const struct logical_volume *lv = lvdm->lv;
@@ -1269,6 +1282,8 @@ char *lv_attr_dup_with_info_and_seg_status(struct dm_pool *mem, const struct lv_
 		repstr[8] = 'p';
 	else if (lv_is_raid_type(lv)) {
 		uint64_t n;
+		char *sync_action;
+
 		if (!activation())
 			repstr[8] = 'X';	/* Unknown */
 		else if (!lv_raid_healthy(lv))
@@ -1276,6 +1291,12 @@ char *lv_attr_dup_with_info_and_seg_status(struct dm_pool *mem, const struct lv_
 		else if (lv_is_raid(lv)) {
 			if (lv_raid_mismatch_count(lv, &n) && n)
 				repstr[8] = 'm';  /* RAID has 'm'ismatches */
+			else if (lv_raid_sync_action(lv, &sync_action) &&
+				 !strcmp(sync_action, "reshape"))
+				repstr[8] = 's';  /* LV is re(s)haping */
+			else if (_sublvs_remove_after_reshape(lv))
+				repstr[8] = 'R';  /* sub-LV got freed from raid set by reshaping
+						     and has to be 'R'emoved */
 		} else if (lv->status & LV_WRITEMOSTLY)
 			repstr[8] = 'w';  /* sub-LV has 'w'ritemostly */
 		else if (lv->status & LV_REMOVE_AFTER_RESHAPE)

lib/report/columns.h

@@ -243,8 +243,8 @@ FIELD(VGS, vg, NUM, "#VMdaCps", cmd, 0, vgmdacopies, vg_mda_copies, "Target numb
 FIELD(SEGS, seg, STR, "Type", list, 0, segtype, segtype, "Type of LV segment.", 0)
 FIELD(SEGS, seg, NUM, "#Str", list, 0, seg_stripes, stripes, "Number of stripes or mirror/raid1 legs.", 0)
 FIELD(SEGS, seg, NUM, "#DStr", list, 0, seg_data_stripes, data_stripes, "Number of data stripes or mirror/raid1 legs.", 0)
-FIELD(SEGS, seg, NUM, "RSize", list, 0, seg_reshape_len, reshape_len, "Size of out-of-place reshape space in current units.", 0)
+FIELD(SEGS, seg, SIZ, "RSize", list, 0, seg_reshape_len, reshape_len, "Size of out-of-place reshape space in current units.", 0)
-FIELD(SEGS, seg, SIZ, "RSize", list, 0, seg_reshape_len_le, reshape_len_le, "Size of out-of-place reshape space in physical extents.", 0)
+FIELD(SEGS, seg, NUM, "RSize", list, 0, seg_reshape_len_le, reshape_len_le, "Size of out-of-place reshape space in logical extents.", 0)
 FIELD(SEGS, seg, NUM, "#Cpy", list, 0, seg_data_copies, data_copies, "Number of data copies.", 0)
 FIELD(SEGS, seg, NUM, "DOff", list, 0, seg_data_offset, data_offset, "Data offset on each image device.", 0)
 FIELD(SEGS, seg, NUM, "NOff", list, 0, seg_new_data_offset, new_data_offset, "New data offset after any reshape on each image device.", 0)

lib/report/report.c

@@ -2412,6 +2412,7 @@ static int _segstartpe_disp(struct dm_report *rh,
 	return dm_report_field_uint32(rh, field, &seg->le);
 }
 
+/* Hepler: get used stripes = total stripes minux any to remove after reshape */
 static int _get_seg_used_stripes(const struct lv_segment *seg)
 {
 	uint32_t s;
@@ -2437,6 +2438,7 @@ static int _seg_stripes_disp(struct dm_report *rh, struct dm_pool *mem,
 	return dm_report_field_uint32(rh, field, &seg->area_count);
 }
 
+/* Report the number of data stripes, which is less than total stripes (e.g. 2 less for raid6) */
 static int _seg_data_stripes_disp(struct dm_report *rh, struct dm_pool *mem,
 				  struct dm_report_field *field,
 				  const void *data, void *private)
@@ -2451,64 +2453,17 @@ static int _seg_data_stripes_disp(struct dm_report *rh, struct dm_pool *mem,
 	return dm_report_field_uint32(rh, field, &stripes);
 }
 
-static int _seg_reshape_len_disp(struct dm_report *rh, struct dm_pool *mem,
+/* Helper: return the top-level, reshapable raid LV in case @seg belongs to an raid rimage LV */
-				    struct dm_report_field *field,
+static struct logical_volume *_lv_for_raid_image_seg(const struct lv_segment *seg, struct dm_pool *mem)
-				    const void *data, void *private)
 {
-	const struct lv_segment *seg = (const struct lv_segment *) data;
-	uint32_t reshape_len = seg->reshape_len;
-
-	if (reshape_len && seg->lv) {
-		reshape_len *= seg->area_count * seg->lv->vg->extent_size;
-
-		return _size32_disp(rh, mem, field, &reshape_len, private);
-	}
-
-	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_32));
-}
-
-static int _seg_reshape_len_le_disp(struct dm_report *rh, struct dm_pool *mem,
-				    struct dm_report_field *field,
-				    const void *data, void *private)
-{
-	const struct lv_segment *seg = (const struct lv_segment *) data;
-	uint32_t reshape_len = seg->reshape_len;
-
-	if (reshape_len) {
-		reshape_len *= seg->area_count;
-
-		return dm_report_field_uint32(rh, field, &reshape_len);
-	}
-
-	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_32));
-}
-
-static int _seg_data_copies_disp(struct dm_report *rh, struct dm_pool *mem,
-				 struct dm_report_field *field,
-				 const void *data, void *private)
-{
-	const struct lv_segment *seg = (const struct lv_segment *) data;
-
-	if (seg->data_copies > 1)
-		return dm_report_field_uint32(rh, field, &seg->data_copies);
-
-	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_32));
-}
-
-static int _segdata_offset(struct dm_report *rh, struct dm_pool *mem,
-			   struct dm_report_field *field,
-			   const void *data, void *private, int new_data_offset)
-{
-	const struct lv_segment *seg = (const struct lv_segment *) data;
-	const char *what = "";
-
-	if (lv_is_raid_image(seg->lv) &&
-	    !seg->le &&
-	    (seg->reshape_len || !new_data_offset)) {
-		struct lv_list *lvl;
 	char *lv_name;
 
-		if ((lv_name = strdup(seg->lv->name))) {
+	if (seg_is_reshapable_raid(seg))
+		return seg->lv;
+
+	if (seg->lv &&
+	    lv_is_raid_image(seg->lv) && !seg->le &&
+	    (lv_name = dm_pool_strdup(mem, seg->lv->name))) {
 		char *p = strchr(lv_name, '_');
 
 		if (p) {
@@ -2517,29 +2472,92 @@ static int _segdata_offset(struct dm_report *rh, struct dm_pool *mem,
 				p = strchr(p + 5, '_');
 
 			if (p) {
+				struct lv_list *lvl;
+
 				*p = '\0';
-					if ((lvl = find_lv_in_vg(seg->lv->vg, lv_name))) {
+				if ((lvl = find_lv_in_vg(seg->lv->vg, lv_name)) &&
-						if (seg_is_reshapable_raid(first_seg(lvl->lv))) {
+				    seg_is_reshapable_raid(first_seg(lvl->lv)))
+					return lvl->lv;
+
+			}
+		}
+	}
+
+	return NULL;
+}
+
+/* Helper: return the top-level raid LV in case it is reshapale for @seg or @seg if it is */
+static const struct lv_segment *_get_reshapable_seg(const struct lv_segment *seg, struct dm_pool *mem)
+{
+	return _lv_for_raid_image_seg(seg, mem) ? seg : NULL;
+}
+
+/* Display segment reshape length in current units */
+static int _seg_reshape_len_disp(struct dm_report *rh, struct dm_pool *mem,
+				    struct dm_report_field *field,
+				    const void *data, void *private)
+{
+	const struct lv_segment *seg = _get_reshapable_seg((const struct lv_segment *) data, mem);
+
+	if (seg) {
+		uint32_t reshape_len = seg->reshape_len * seg->area_count * seg->lv->vg->extent_size;
+
+		return _size32_disp(rh, mem, field, &reshape_len, private);
+	}
+
+	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
+}
+
+/* Display segment reshape length of in logical extents */
+static int _seg_reshape_len_le_disp(struct dm_report *rh, struct dm_pool *mem,
+				    struct dm_report_field *field,
+				    const void *data, void *private)
+{
+	const struct lv_segment *seg = _get_reshapable_seg((const struct lv_segment *) data, mem);
+
+	if (seg) {
+		uint32_t reshape_len = seg->reshape_len* seg->area_count;
+
+		return dm_report_field_uint32(rh, field, &reshape_len);
+	}
+
+	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
+}
+
+/* Display segment data copies (e.g. 3 for raid6) */
+static int _seg_data_copies_disp(struct dm_report *rh, struct dm_pool *mem,
+				 struct dm_report_field *field,
+				 const void *data, void *private)
+{
+	const struct lv_segment *seg = (const struct lv_segment *) data;
+
+	if (seg->data_copies)
+		return dm_report_field_uint32(rh, field, &seg->data_copies);
+
+	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
+}
+
+/* Helper: display segment data offset/new data offset in sectors */
+static int _segdata_offset(struct dm_report *rh, struct dm_pool *mem,
+			   struct dm_report_field *field,
+			   const void *data, void *private, int new_data_offset)
+{
+	const struct lv_segment *seg = (const struct lv_segment *) data;
+	struct logical_volume *lv;
+
+	if ((lv = _lv_for_raid_image_seg(seg, mem))) {
 		uint64_t data_offset;
 
-							if (lv_raid_data_offset(lvl->lv, &data_offset)) {
+		if (lv_raid_data_offset(lv, &data_offset)) {
 			if (new_data_offset && !lv_raid_image_in_sync(seg->lv))
-									data_offset = data_offset ? 0 :
+				data_offset = data_offset ? 0 : seg->reshape_len * lv->vg->extent_size;
-										      seg->reshape_len * seg->lv->vg->extent_size;
 
 			return dm_report_field_uint64(rh, field, &data_offset);
 		}
 
-							what = _str_unknown;
-						}
-					}
-				}
-			}
 	}
 
-	}
+	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
-
-	return _field_set_value(field, what, &GET_TYPE_RESERVED_VALUE(num_undef_64));
 }
 
 static int _seg_data_offset_disp(struct dm_report *rh, struct dm_pool *mem,
@@ -2582,7 +2600,7 @@ static int _seg_parity_chunks_disp(struct dm_report *rh, struct dm_pool *mem,
 		return dm_report_field_uint32(rh, field, &parity_chunks);
 	}
 
-	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_32));
+	return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
 }
 
 static int _segsize_disp(struct dm_report *rh, struct dm_pool *mem,