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ocfs2/dlm: let sender retry if dlm_dispatch_assert_master failed with -ENOMEM

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Do not BUG() if GFP_ATOMIC allocation fails in dlm_dispatch_assert_master.
Instead, return -ENOMEM to the sender and then retry.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: Alex Chen <alex.chen@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joseph Qi 2014-12-10 15:41:34 -08:00 committed by Linus Torvalds
parent ded0014274
commit f08736bd6c
1 changed files with 13 additions and 5 deletions
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18
fs/ocfs2/dlm/dlmrecovery.c
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@ -1656,14 +1656,18 @@ int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
req.namelen = res->lockname.len;
memcpy(req.name, res->lockname.name, res->lockname.len);
resend:
ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
&req, sizeof(req), nodenum, &status);
/* XXX: negative status not handled properly here. */
if (ret < 0)
mlog(ML_ERROR, "Error %d when sending message %u (key "
"0x%x) to node %u\n", ret, DLM_MASTER_REQUERY_MSG,
dlm->key, nodenum);
else {
else if (status == -ENOMEM) {
mlog_errno(status);
msleep(50);
goto resend;
} else {
BUG_ON(status < 0);
BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
*real_master = (u8) (status & 0xff);
@ -1705,9 +1709,13 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
int ret = dlm_dispatch_assert_master(dlm, res,
0, 0, flags);
if (ret < 0) {
mlog_errno(-ENOMEM);
/* retry!? */
BUG();
mlog_errno(ret);
spin_unlock(&res->spinlock);
dlm_lockres_put(res);
spin_unlock(&dlm->spinlock);
dlm_put(dlm);
/* sender will take care of this and retry */
return ret;
} else
__dlm_lockres_grab_inflight_worker(dlm, res);
spin_unlock(&res->spinlock);