NFSv4: Handle NFS4ERR_GRACE when recovering an expired lease.

[karo-tx-linux.git] / fs / fs-writeback.c

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 9d5360c4c2afbe98d2b46112f131f90d943e00f5..ef2acd24cc02fd13bfb402d7b47fb2cc355e6f5b 100644 (file)
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -859,6 +859,12 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
        unsigned long expired;
        long nr_pages;
 
+       /*
+        * When set to zero, disable periodic writeback
+        */
+       if (!dirty_writeback_interval)
+               return 0;
+
        expired = wb->last_old_flush +
                        msecs_to_jiffies(dirty_writeback_interval * 10);
        if (time_before(jiffies, expired))
@@ -954,8 +960,12 @@ int bdi_writeback_task(struct bdi_writeback *wb)
                                break;
                }
 
-               wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
-               schedule_timeout_interruptible(wait_jiffies);
+               if (dirty_writeback_interval) {
+                       wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
+                       schedule_timeout_interruptible(wait_jiffies);
+               } else
+                       schedule();
+
                try_to_freeze();
        }
 
@@ -1212,6 +1222,23 @@ void writeback_inodes_sb(struct super_block *sb)
 }
 EXPORT_SYMBOL(writeback_inodes_sb);
 
+/**
+ * writeback_inodes_sb_if_idle -       start writeback if none underway
+ * @sb: the superblock
+ *
+ * Invoke writeback_inodes_sb if no writeback is currently underway.
+ * Returns 1 if writeback was started, 0 if not.
+ */
+int writeback_inodes_sb_if_idle(struct super_block *sb)
+{
+       if (!writeback_in_progress(sb->s_bdi)) {
+               writeback_inodes_sb(sb);
+               return 1;
+       } else
+               return 0;
+}
+EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
+
 /**
  * sync_inodes_sb      -       sync sb inode pages
  * @sb: the superblock