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raid5-cache: add journal hot add/remove support

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Add support for journal disk hot add/remove. Mostly trival checks in md
part. The raid5 part is a little tricky. For hot-remove, we can't wait
pending write as it's called from raid5d. The wait will cause deadlock.
We simplily fail the hot-remove. A hot-remove retry can success
eventually since if journal disk is faulty all pending write will be
failed and finish. For hot-add, since an array supporting journal but
without journal disk will be marked read-only, we are safe to hot add
journal without stopping IO (should be read IO, while journal only
handles write IO).

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li
2015-12-21 10:51:02 +11:00
committed by NeilBrown
parent 9ebc6ef188
commit f6b6ec5cfa
3 changed files with 68 additions and 24 deletions
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16
drivers/md/raid5-cache.c
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@@ -799,10 +799,18 @@ void r5l_quiesce(struct r5l_log *log, int state)
bool r5l_log_disk_error(struct r5conf *conf)
{
struct r5l_log *log;
bool ret;
/* don't allow write if journal disk is missing */
if (!conf->log)
return test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
return test_bit(Faulty, &conf->log->rdev->flags);
rcu_read_lock();
log = rcu_dereference(conf->log);
if (!log)
ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
else
ret = test_bit(Faulty, &log->rdev->flags);
rcu_read_unlock();
return ret;
}
struct r5l_recovery_ctx {
@@ -1165,7 +1173,7 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
if (r5l_load_log(log))
goto error;
conf->log = log;
rcu_assign_pointer(conf->log, log);
return 0;
error:
md_unregister_thread(&log->reclaim_thread);