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md-cluster: change array_sectors and update size are not supported

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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: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang 2016-05-02 11:33:13 -04:00 committed by Shaohua Li
parent 1535212c54
commit ab5a98b132
2 changed files with 14 additions and 0 deletions
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6
Documentation/md-cluster.txt
View file

@ -316,3 +316,9 @@ The algorithm is:
nodes are using the raid which is achieved by lock all bitmap nodes are using the raid which is achieved by lock all bitmap
locks within the cluster, and also those locks are unlocked locks within the cluster, and also those locks are unlocked
accordingly. accordingly.
7. Unsupported features
There are somethings which are not supported by cluster MD yet.
- update size and change array_sectors.

8
drivers/md/md.c
View file

@ -4817,6 +4817,10 @@ array_size_store(struct mddev *mddev, const char *buf, size_t len)
if (err) if (err)
return 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 (strncmp(buf, "default", 7) == 0) {
if (mddev->pers) if (mddev->pers)
sectors = mddev->pers->size(mddev, 0, 0); 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 rv;
int fit = (num_sectors == 0); int fit = (num_sectors == 0);
/* cluster raid doesn't support update size */
if (mddev_is_clustered(mddev))
return -EINVAL;
if (mddev->pers->resize == NULL) if (mddev->pers->resize == NULL)
return -EINVAL; return -EINVAL;
/* The "num_sectors" is the number of sectors of each device that /* The "num_sectors" is the number of sectors of each device that