- struct ccc_page *vpg = cl2ccc_page(slice);
- cfs_page_t *vmpage = vpg->cpg_page;
- int count = 0;
-
- LASSERT(vmpage != NULL);
-
- /* DEBUG CODE FOR #18881 */
- while (TestSetPageLocked(vmpage)) {
- cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE,
- cfs_time_seconds(1)/10);
- if (++count > 600) {
- CL_PAGE_DEBUG(D_ERROR, env,
- cl_page_top(slice->cpl_page),
- "XXX page %p blocked on acquiring the"
- " lock. process %s/%p, flags %lx,io %p\n",
- vmpage, current->comm, current,
- vmpage->flags, io);
- libcfs_debug_dumpstack(NULL);
- if (slice->cpl_page->cp_task) {
- cfs_task_t *tsk = slice->cpl_page->cp_task;
- LCONSOLE_WARN("The page was owned by %s\n",
- tsk->comm);
- libcfs_debug_dumpstack(tsk);
- }
- LCONSOLE_WARN("Reproduced bug #18881,please contact:"
- "jay <jinshan.xiong@sun.com>, thanks\n");
-
- lock_page(vmpage);
- break;
+ struct ccc_page *vpg = cl2ccc_page(slice);
+ struct page *vmpage = vpg->cpg_page;
+
+ LASSERT(vmpage != NULL);
+ if (nonblock) {
+ if (!trylock_page(vmpage))
+ return -EAGAIN;
+
+ if (unlikely(PageWriteback(vmpage))) {
+ unlock_page(vmpage);
+ return -EAGAIN;