nilfs2: fix irregular checkpoint creation due to data flush

When nilfs flushes out dirty data to reduce memory pressure, creation
of checkpoints is wrongly postponed.  This bug causes irregular
checkpoint creation especially in small footprint systems.

To correct this issue, a timer for the checkpoint creation has to be
continued if a log writer does not create a checkpoint.

This will do the correction.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 683df89dbae5a3366ac459e660776bcccc69bc47..6eff66a070d5e39c23a8c2af4f51f6b62ba91881 100644 (file)
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2468,17 +2468,22 @@ static void nilfs_segctor_notify(struct nilfs_sc_info *sci,
        /* Clear requests (even when the construction failed) */
        spin_lock(&sci->sc_state_lock);
 
-       sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
-
        if (req->mode == SC_LSEG_SR) {
+               sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
                sci->sc_seq_done = req->seq_accepted;
                nilfs_segctor_wakeup(sci, req->sc_err ? : req->sb_err);
                sci->sc_flush_request = 0;
-       } else if (req->mode == SC_FLUSH_FILE)
-               sci->sc_flush_request &= ~FLUSH_FILE_BIT;
-       else if (req->mode == SC_FLUSH_DAT)
-               sci->sc_flush_request &= ~FLUSH_DAT_BIT;
+       } else {
+               if (req->mode == SC_FLUSH_FILE)
+                       sci->sc_flush_request &= ~FLUSH_FILE_BIT;
+               else if (req->mode == SC_FLUSH_DAT)
+                       sci->sc_flush_request &= ~FLUSH_DAT_BIT;
 
+               /* re-enable timer if checkpoint creation was not done */
+               if (sci->sc_timer && (sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
+                   time_before(jiffies, sci->sc_timer->expires))
+                       add_timer(sci->sc_timer);
+       }
        spin_unlock(&sci->sc_state_lock);
 }