JFS: call io_schedule() instead of schedule() to avoid deadlock

The introduction of Jens Axboe's explicit i/o plugging patches introduced a
deadlock in jfs.  This was caused by the process initiating I/O not
unplugging the queue before waiting on the commit thread.  The commit
thread itself was waiting for that I/O to complete.  Calling io_schedule()
rather than schedule() unplugs the I/O queue avoiding the deadlock, and it
appears to be the right function to call in any case.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

3 files changed, 3 insertions, 3 deletions

diff --git a/fs/jfs/jfs_lock.h b/fs/jfs/jfs_lock.h
index 7d78e83d7c40..df48ece4b7a3 100644
--- a/fs/jfs/jfs_lock.h
+++ b/fs/jfs/jfs_lock.h
@@ -42,7 +42,7 @@ do {							\
                 if (cond)                               \
                         break;                          \
                 unlock_cmd;                             \
-                schedule();                             \
+                io_schedule();                          \
                 lock_cmd;                               \
         }                                               \
         current->state = TASK_RUNNING;                  \
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index ceaf03b94935..58deae007507 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -56,7 +56,7 @@ static inline void __lock_metapage(struct metapage *mp)
                 set_current_state(TASK_UNINTERRUPTIBLE);
                 if (metapage_locked(mp)) {
                         unlock_page(mp->page);
-                        schedule();
+                        io_schedule();
                         lock_page(mp->page);
                 }
         } while (trylock_metapage(mp));
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index d558e51b0df8..6988a1082f58 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -135,7 +135,7 @@ static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
         add_wait_queue(event, &wait);
         set_current_state(TASK_UNINTERRUPTIBLE);
         TXN_UNLOCK();
-        schedule();
+        io_schedule();
         current->state = TASK_RUNNING;
         remove_wait_queue(event, &wait);
 }