1 files changed, 21 insertions, 13 deletions

diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index e8e632a1dcd..bc5857199ec 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -293,13 +293,14 @@ void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last)
  *
  * This function is called when the write-buffer timer expires.
  */
-static void wbuf_timer_callback_nolock(unsigned long data)
+static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
 {
-        struct ubifs_wbuf *wbuf = (struct ubifs_wbuf *)data;
+        struct ubifs_wbuf *wbuf = container_of(timer, struct ubifs_wbuf, timer);
 
         wbuf->need_sync = 1;
         wbuf->c->need_wbuf_sync = 1;
         ubifs_wake_up_bgt(wbuf->c);
+        return HRTIMER_NORESTART;
 }
 
 /**
@@ -308,13 +309,12 @@ static void wbuf_timer_callback_nolock(unsigned long data)
  */
 static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
 {
-        ubifs_assert(!timer_pending(&wbuf->timer));
+        ubifs_assert(!hrtimer_active(&wbuf->timer));
 
-        if (!wbuf->timeout)
+        if (!ktime_to_ns(wbuf->softlimit))
                 return;
-
-        wbuf->timer.expires = jiffies + wbuf->timeout;
-        add_timer(&wbuf->timer);
+        hrtimer_start_range_ns(&wbuf->timer, wbuf->softlimit, wbuf->delta,
+                               HRTIMER_MODE_REL);
 }
 
 /**
@@ -329,7 +329,7 @@ static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
          * should be canceled.
          */
         wbuf->need_sync = 0;
-        del_timer(&wbuf->timer);
+        hrtimer_cancel(&wbuf->timer);
 }
 
 /**
@@ -825,6 +825,7 @@ out:
 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
 {
         size_t size;
+        ktime_t hardlimit;
 
         wbuf->buf = kmalloc(c->min_io_size, GFP_KERNEL);
         if (!wbuf->buf)
@@ -845,14 +846,21 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
         wbuf->sync_callback = NULL;
         mutex_init(&wbuf->io_mutex);
         spin_lock_init(&wbuf->lock);
-
         wbuf->c = c;
-        init_timer(&wbuf->timer);
-        wbuf->timer.function = wbuf_timer_callback_nolock;
-        wbuf->timer.data = (unsigned long)wbuf;
-        wbuf->timeout = DEFAULT_WBUF_TIMEOUT;
         wbuf->next_ino = 0;
 
+        hrtimer_init(&wbuf->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+        wbuf->timer.function = wbuf_timer_callback_nolock;
+        /*
+         * Make write-buffer soft limit to be 20% of the hard limit. The
+         * write-buffer timer is allowed to expire any time between the soft
+         * and hard limits.
+         */
+        hardlimit = ktime_set(DEFAULT_WBUF_TIMEOUT_SECS, 0);
+        wbuf->delta = (DEFAULT_WBUF_TIMEOUT_SECS * NSEC_PER_SEC) * 2 / 10;
+        wbuf->softlimit = ktime_sub_ns(hardlimit, wbuf->delta);
+        hrtimer_set_expires_range_ns(&wbuf->timer,  wbuf->softlimit,
+                                     wbuf->delta);
         return 0;
 }