[PATCH 2/6] Define imsm_analyze_change function

[Krzysztof Wojcik <krzysztof.wojcik@xxxxxxxxx>]

Function intended to use for single volume migration.
Function analyze transition and validate if it is supported.

Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@xxxxxxxxx>
---
 super-intel.c |  134 +++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 125 insertions(+), 9 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index 8c1ed4e..81f8e81 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -6549,15 +6549,127 @@ static void imsm_update_metadata_locally(struct supertype *st,
 	}
 }
 
-/**************************************************************************************
+/***************************************************************************
+>>>>>>> 686d792... Define imsm_analyze_change function:super-intel.c
 * Function:	imsm_analyze_change
-* Description:	Function analyze and validate change for single volume migration
+* Description:	Function analyze change for single volume
+* 		and validate if transition is supported
 * Parameters:	Geometry parameters, supertype structure
 * Returns:	Operation type code on success, -1 if fail
-*************************************************************************************/
-enum imsm_reshape_type imsm_analyze_change(struct supertype *st, struct geo_params *geo)
+****************************************************************************/
+enum imsm_reshape_type imsm_analyze_change(struct supertype *st,
+						struct geo_params *geo)
 {
-	return -1;
+	int fd = -1;
+	struct mdinfo *sra = NULL;
+	int change = -1;
+	int check_devs = 0;
+
+	fd = open_dev(geo->dev_id);
+	if (fd < 0) {
+		printf("imsm: Error. Cannot open %s device\n", geo->dev_name);
+		return -1;
+	}
+
+	sra = sysfs_read(fd, 0,
+			GET_DISKS | GET_LAYOUT | GET_CHUNK |
+			GET_SIZE | GET_LEVEL | GET_DEVS);
+	if (!sra) {
+		dprintf("imsm: Error. Cannot get mdinfo for %s!\n", geo->dev_name);
+		goto analyse_change_exit;
+	}
+
+	if ((geo->level != sra->array.level) &&
+		(geo->level >= 0) &&
+		(geo->level != UnSet)) {
+		switch (sra->array.level) {
+		case 0:
+			if (geo->level == 5) {
+				change = CH_LEVEL_MIGRATION;
+				check_devs = 1;
+			}
+			if (geo->level == 10) {
+				change = CH_TAKEOVER;
+				check_devs = 1;
+			}
+			break;
+		case 5:
+			if (geo->level != 0)
+				change = CH_LEVEL_MIGRATION;
+			break;
+		case 10:
+			if (geo->level == 0) {
+				change = CH_TAKEOVER;
+				check_devs = 1;
+			}
+			break;
+		}
+		if (change == -1) {
+			dprintf("imsm: Error. Level Migration from %d to %d "\
+				"not supported!\n", sra->array.level, geo->level);
+			goto analyse_change_exit;
+		}
+	} else {
+		geo->level = sra->array.level;
+	}
+
+	if ((geo->layout != sra->array.layout)
+		&& ((geo->layout != UnSet) && (geo->layout != -1))) {
+		change = CH_LEVEL_MIGRATION;
+		if ((sra->array.layout == 0) && (sra->array.level == 5)
+			&& (geo->layout == 5)) {
+			/* reshape 5 -> 4 */
+		} else if ((sra->array.layout == 5)
+				&& (sra->array.level == 5)
+				&& (geo->layout == 0)) {
+			/* reshape 4 -> 5 */
+			geo->layout = 0;
+			geo->level = 5;
+		} else {
+			dprintf("imsm: Error. Layout Migration from %d to %d "\
+				"not supported!\n", sra->array.layout, geo->layout);
+			change = -1;
+			goto analyse_change_exit;
+		}
+	} else {
+		geo->layout = sra->array.layout;
+	}
+
+	if ((geo->chunksize > 0) && (geo->chunksize != UnSet)
+		&& (geo->chunksize != sra->array.chunk_size)) {
+		change = CH_CHUNK_MIGR;
+	} else {
+		geo->chunksize = sra->array.chunk_size;
+	}
+
+	if (!validate_geometry_imsm(st,
+					geo->level,
+					geo->layout,
+					geo->raid_disks,
+					(geo->chunksize / 1024),
+					geo->size,
+					0, 0, 1))
+		change = -1;
+
+	if (check_devs) {
+		struct intel_super *super = st->sb;
+		struct imsm_super *mpb = super->anchor;
+
+		if (mpb->num_raid_devs > 1) {
+			printf("imsm: Error. Cannot perform operation on %s"\
+				"- for this operation it MUST be single "\
+			       "array in container\n",
+				geo->dev_name);
+			change = -1;
+		}
+	}
+
+analyse_change_exit:
+	sysfs_free(sra);
+	if (fd > -1)
+		close(fd);
+
+	return change;
 }
 
 static int imsm_reshape_super(struct supertype *st, long long size, int level,
@@ -6623,13 +6735,17 @@ static int imsm_reshape_super(struct supertype *st, long long size, int level,
 		change = imsm_analyze_change(st, &geo);
 		switch (change) {
 			case CH_TAKEOVER:
-			break;
+				ret_val = 0;
+				break;
 			case CH_CHUNK_MIGR:
-			break;
+				ret_val = 0;
+				break;
 			case CH_LEVEL_MIGRATION:
-			break;
+				ret_val = 0;
+				break;
+			default:
+				ret_val = 1;
 		}
-		ret_val = 0;
 	}
 
 exit_imsm_reshape_super:

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