Index: xfsprogs-dev/repair/prefetch.c
===================================================================
--- xfsprogs-dev.orig/repair/prefetch.c 2011-11-25 13:46:47.195999430 +0100
+++ xfsprogs-dev/repair/prefetch.c 2011-11-25 13:50:41.264731371 +0100
@@ -641,7 +641,18 @@ pf_queuing_worker(
pftrace("queuing irec %p in AG %d, sem count = %d",
irec, args->agno, i);
#endif
- sem_wait(&args->ra_count);
+ err = sem_trywait(&args->ra_count);
+ if (err == EAGAIN) {
+ /*
+ * Kick the queue once we have reached the limit;
+ * without this the threads processing the inodes
+ * might get stuck on a buffer that has been locked
+ * and added to the I/O queue but is waiting for
+ * the thread to be woken.
+ */
+ pf_start_io_workers(args);
+ sem_wait(&args->ra_count);
+ }
num_inos = 0;
bno = XFS_AGINO_TO_AGBNO(mp, cur_irec->ino_startnum);
Could the second sem_wait() also fail with EAGAIN?
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
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