[PATCH 1/6] Define imsm_analyze_change function

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

Signed-off-by: Krzysztof Wojcik
---
super-intel.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 124 insertions(+), 11 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index 4cbb070..c12ba74 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -6576,16 +6576,110 @@ static void imsm_update_metadata_locally(struct supertype *st,
}
}

-/********************************************************** *********************
+/********************************************************** *****************
* 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;
+ struct mdinfo info;
+ int change = -1;
+ int check_devs = 0;
+
+ getinfo_super_imsm_volume(st, &info, NULL);
+
+ if ((geo->level != info.array.level) &&
+ (geo->level >= 0) &&
+ (geo->level != UnSet)) {
+ switch (info.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) {
+ fprintf(stderr, Name " Error. Level Migration from %d to %d "\
+ "not supported!\n", info.array.level, geo->level);
+ goto analyse_change_exit;
+ }
+ } else {
+ geo->level = info.array.level;
+ }
+
+ if ((geo->layout != info.array.layout)
+ && ((geo->layout != UnSet) && (geo->layout != -1))) {
+ change = CH_LEVEL_MIGRATION;
+ if ((info.array.layout == 0) && (info.array.level == 5)
+ && (geo->layout == 5)) {
+ /* reshape 5 -> 4 */
+ } else if ((info.array.layout == 5)
+ && (info.array.level == 5)
+ && (geo->layout == 0)) {
+ /* reshape 4 -> 5 */
+ geo->layout = 0;
+ geo->level = 5;
+ } else {
+ fprintf(stderr, Name " Error. Layout Migration from %d to %d "\
+ "not supported!\n", info.array.layout, geo->layout);
+ change = -1;
+ goto analyse_change_exit;
+ }
+ } else {
+ geo->layout = info.array.layout;
+ }
+
+ if ((geo->chunksize > 0) && (geo->chunksize != UnSet)
+ && (geo->chunksize != info.array.chunk_size)) {
+ change = CH_CHUNK_MIGR;
+ } else {
+ geo->chunksize = info.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) {
+ fprintf(stderr, Name " 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:
+
+ return change;
}

static int imsm_reshape_super(struct supertype *st, long long size, int level,
@@ -6649,18 +6743,37 @@ static int imsm_reshape_super(struct supertype *st, long long size, int level,
* - chunk size migration
* - migration: raid5 -> raid0; raid0 -> raid5
*/
- int change;
+ struct intel_super *super = st->sb;
+ struct intel_dev *dev = super->devlist;
+ int change, devnum;
dprintf("imsm: info: Volume operation\n");
+ /* find requested device */
+ while (dev) {
+ imsm_find_array_minor_by_subdev(dev->index, st->container_dev, &devnum);
+ if (devnum == geo.dev_id)
+ break;
+ dev = dev->next;
+ }
+ if (dev == NULL) {
+ fprintf(stderr, Name " Cannot find %s (%i) subarray\n",
+ geo.dev_name, geo.dev_id);
+ goto exit_imsm_reshape_super;
+ }
+ super->current_vol = dev->index;
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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