summaryrefslogtreecommitdiff
path: root/drivers/md/md-cluster.c
diff options
context:
space:
mode:
authorGuoqing Jiang <gqjiang@suse.com>2017-03-01 11:42:39 +0300
committerShaohua Li <shli@fb.com>2017-03-17 02:55:50 +0300
commitb98938d16a108d0201d54b8db1337dac71aebfdd (patch)
tree2005c989bfe629751fa7349d808cd541695a1930 /drivers/md/md-cluster.c
parent7da3d203330305695f38302c076ee0d32c005ede (diff)
downloadlinux-b98938d16a108d0201d54b8db1337dac71aebfdd.tar.xz
md-cluster: introduce cluster_check_sync_size
Support resize is a little complex for clustered raid, since we need to ensure all the nodes share the same knowledge about the size of raid. We achieve the goal by check the sync_size which is in each node's bitmap, we can only change the capacity after cluster_check_sync_size returns 0. Also, get_bitmap_from_slot is added to get a slot's bitmap. And we exported some funcs since they are used in cluster_check_sync_size(). We can also reuse get_bitmap_from_slot to remove redundant code existed in bitmap_copy_from_slot. Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md-cluster.c')
-rw-r--r--drivers/md/md-cluster.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 8b7d55bf5aa2..92c3c51ede4d 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1091,6 +1091,66 @@ static void metadata_update_cancel(struct mddev *mddev)
unlock_comm(cinfo);
}
+/*
+ * return 0 if all the bitmaps have the same sync_size
+ */
+int cluster_check_sync_size(struct mddev *mddev)
+{
+ int i, rv;
+ bitmap_super_t *sb;
+ unsigned long my_sync_size, sync_size = 0;
+ int node_num = mddev->bitmap_info.nodes;
+ int current_slot = md_cluster_ops->slot_number(mddev);
+ struct bitmap *bitmap = mddev->bitmap;
+ char str[64];
+ struct dlm_lock_resource *bm_lockres;
+
+ sb = kmap_atomic(bitmap->storage.sb_page);
+ my_sync_size = sb->sync_size;
+ kunmap_atomic(sb);
+
+ for (i = 0; i < node_num; i++) {
+ if (i == current_slot)
+ continue;
+
+ bitmap = get_bitmap_from_slot(mddev, i);
+ if (IS_ERR(bitmap)) {
+ pr_err("can't get bitmap from slot %d\n", i);
+ return -1;
+ }
+
+ /*
+ * If we can hold the bitmap lock of one node then
+ * the slot is not occupied, update the sb.
+ */
+ snprintf(str, 64, "bitmap%04d", i);
+ bm_lockres = lockres_init(mddev, str, NULL, 1);
+ if (!bm_lockres) {
+ pr_err("md-cluster: Cannot initialize %s\n", str);
+ lockres_free(bm_lockres);
+ return -1;
+ }
+ bm_lockres->flags |= DLM_LKF_NOQUEUE;
+ rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
+ if (!rv)
+ bitmap_update_sb(bitmap);
+ lockres_free(bm_lockres);
+
+ sb = kmap_atomic(bitmap->storage.sb_page);
+ if (sync_size == 0)
+ sync_size = sb->sync_size;
+ else if (sync_size != sb->sync_size) {
+ kunmap_atomic(sb);
+ bitmap_free(bitmap);
+ return -1;
+ }
+ kunmap_atomic(sb);
+ bitmap_free(bitmap);
+ }
+
+ return (my_sync_size == sync_size) ? 0 : -1;
+}
+
static int resync_start(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;