target/linux/generic/backport-4.9/030-01-ubifs-Drop-softlimit-and-delta-fields-from-struct-ub.patch

   1 From 854826c9d526fd81077742c3b000e3f7fcaef3ce Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Tue, 20 Sep 2016 10:36:14 +0200
   4 Subject: [PATCH] ubifs: Drop softlimit and delta fields from struct ubifs_wbuf
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
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   8
   9 Values of these fields are set during init and never modified. They are
  10 used (read) in a single function only. There isn't really any reason to
  11 keep them in a struct. It only makes struct just a bit bigger without
  12 any visible gain.
  13
  14 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  15 Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
  16 Signed-off-by: Richard Weinberger <richard@nod.at>
  17 ---
  18  fs/ubifs/io.c    | 18 ++++++++++--------
  19  fs/ubifs/ubifs.h |  5 -----
  20  2 files changed, 10 insertions(+), 13 deletions(-)
  21
  22 --- a/fs/ubifs/io.c
  23 +++ b/fs/ubifs/io.c
  24 @@ -452,16 +452,22 @@ static enum hrtimer_restart wbuf_timer_c
  25   */
  26  static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
  27  {
  28 +       ktime_t softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
  29 +       unsigned long long delta;
  30 +
  31 +       delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
  32 +       delta *= 1000000000ULL;
  33 +
  34         ubifs_assert(!hrtimer_active(&wbuf->timer));
  35 +       ubifs_assert(delta <= ULONG_MAX);
  36
  37         if (wbuf->no_timer)
  38                 return;
  39         dbg_io("set timer for jhead %s, %llu-%llu millisecs",
  40                dbg_jhead(wbuf->jhead),
  41 -              div_u64(ktime_to_ns(wbuf->softlimit), USEC_PER_SEC),
  42 -              div_u64(ktime_to_ns(wbuf->softlimit) + wbuf->delta,
  43 -                      USEC_PER_SEC));
  44 -       hrtimer_start_range_ns(&wbuf->timer, wbuf->softlimit, wbuf->delta,
  45 +              div_u64(ktime_to_ns(softlimit), USEC_PER_SEC),
  46 +              div_u64(ktime_to_ns(softlimit) + delta, USEC_PER_SEC));
  47 +       hrtimer_start_range_ns(&wbuf->timer, softlimit, delta,
  48                                HRTIMER_MODE_REL);
  49  }
  50
  51 @@ -1059,10 +1065,6 @@ int ubifs_wbuf_init(struct ubifs_info *c
  52
  53         hrtimer_init(&wbuf->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
  54         wbuf->timer.function = wbuf_timer_callback_nolock;
  55 -       wbuf->softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
  56 -       wbuf->delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
  57 -       wbuf->delta *= 1000000000ULL;
  58 -       ubifs_assert(wbuf->delta <= ULONG_MAX);
  59         return 0;
  60  }
  61
  62 --- a/fs/ubifs/ubifs.h
  63 +++ b/fs/ubifs/ubifs.h
  64 @@ -645,9 +645,6 @@ typedef int (*ubifs_lpt_scan_callback)(s
  65   * @io_mutex: serializes write-buffer I/O
  66   * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
  67   *        fields
  68 - * @softlimit: soft write-buffer timeout interval
  69 - * @delta: hard and soft timeouts delta (the timer expire interval is @softlimit
  70 - *         and @softlimit + @delta)
  71   * @timer: write-buffer timer
  72   * @no_timer: non-zero if this write-buffer does not have a timer
  73   * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing
  74 @@ -676,8 +673,6 @@ struct ubifs_wbuf {
  75         int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
  76         struct mutex io_mutex;
  77         spinlock_t lock;
  78 -       ktime_t softlimit;
  79 -       unsigned long long delta;
  80         struct hrtimer timer;
  81         unsigned int no_timer:1;
  82         unsigned int need_sync:1;