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ceph: Fix infinite loop in __wake_requests 

__wake_requests() will enter infinite loop if we use it to wake
requests in the session->s_waiting list. __wake_requests() deletes
requests from the list and __do_request() adds requests back to
the list.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Yan, Zheng 2012-11-19 10:49:06 +08:00 committed by Alex Elder
parent 5e62ad3015
commit ed75ec2cd1
1 changed files with 7 additions and 2 deletions
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9
fs/ceph/mds_client.c
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@ -1876,9 +1876,14 @@ finish:
static void __wake_requests(struct ceph_mds_client *mdsc,
struct list_head *head)
{
struct ceph_mds_request *req, *nreq;
struct ceph_mds_request *req;
LIST_HEAD(tmp_list);
list_for_each_entry_safe(req, nreq, head, r_wait) {
list_splice_init(head, &tmp_list);
while (!list_empty(&tmp_list)) {
req = list_entry(tmp_list.next,
struct ceph_mds_request, r_wait);
list_del_init(&req->r_wait);
__do_request(mdsc, req);
}