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Gather on-going resync information of other nodes

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When a node joins, it does not know of other nodes performing resync.
So, each node keeps the resync information in it's LVB. When a new
node joins, it reads the LVB of each "online" bitmap.

[TODO] The new node attempts to get the PW lock on other bitmap, if
it is successful, it reads the bitmap and performs the resync (if
required) on it's behalf.

If the node does not get the PW, it requests CR and reads the LVB
for the resync information.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues
2014-06-06 12:35:34 -05:00
parent 54519c5f4b
commit 96ae923ab6
3 changed files with 120 additions and 0 deletions
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8
drivers/md/md.c
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@@ -7626,6 +7626,9 @@ void md_do_sync(struct md_thread *thread)
md_new_event(mddev);
update_time = jiffies;
if (mddev_is_clustered(mddev))
md_cluster_ops->resync_info_update(mddev, j, max_sectors);
blk_start_plug(&plug);
while (j < max_sectors) {
sector_t sectors;
@@ -7686,6 +7689,8 @@ void md_do_sync(struct md_thread *thread)
j += sectors;
if (j > 2)
mddev->curr_resync = j;
if (mddev_is_clustered(mddev))
md_cluster_ops->resync_info_update(mddev, j, max_sectors);
mddev->curr_mark_cnt = io_sectors;
if (last_check == 0)
/* this is the earliest that rebuild will be
@@ -7746,6 +7751,9 @@ void md_do_sync(struct md_thread *thread)
/* tell personality that we are finished */
mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
if (mddev_is_clustered(mddev))
md_cluster_ops->resync_info_update(mddev, 0, 0);
if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
mddev->curr_resync > 2) {
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {