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Commit ab5a98b1 authored by Guoqing Jiang's avatar Guoqing Jiang Committed by Shaohua Li
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md-cluster: change array_sectors and update size are not supported 



Currently, some features are not supported yet,
such as change array_sectors and update size, so
return EINVAL for them and listed it in document.

Reviewed-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarGuoqing Jiang <gqjiang@suse.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 1535212c

Documentation/md-cluster.txt

+6 −0
Original line number Diff line number Diff line
@@ -316,3 +316,9 @@ The algorithm is: 
 nodes are using the raid which is achieved by lock all bitmap

 locks within the cluster, and also those locks are unlocked

 accordingly.



7. Unsupported features



There are somethings which are not supported by cluster MD yet.



- update size and change array_sectors.

drivers/md/md.c

+8 −0
Original line number Diff line number Diff line
@@ -4817,6 +4817,10 @@ array_size_store(struct mddev *mddev, const char *buf, size_t len) 
	if (err)

		return err;



	/* cluster raid doesn't support change array_sectors */

	if (mddev_is_clustered(mddev))

		return -EINVAL;



	if (strncmp(buf, "default", 7) == 0) {

		if (mddev->pers)

			sectors = mddev->pers->size(mddev, 0, 0);
@@ -6438,6 +6442,10 @@ static int update_size(struct mddev *mddev, sector_t num_sectors) 
	int rv;

	int fit = (num_sectors == 0);



	/* cluster raid doesn't support update size */

	if (mddev_is_clustered(mddev))

		return -EINVAL;



	if (mddev->pers->resize == NULL)

		return -EINVAL;

	/* The "num_sectors" is the number of sectors of each device that