kernel: backport ubifs support for dirty_writeback_interval
These patches were queued for 4.10. For possible use cases see added: [PATCH] ubifs: Use dirty_writeback_interval value for wbuf timer Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Rafał Miłecki
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2 changed files with 148 additions and 0 deletions
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From 854826c9d526fd81077742c3b000e3f7fcaef3ce Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 20 Sep 2016 10:36:14 +0200
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Subject: [PATCH] ubifs: Drop softlimit and delta fields from struct ubifs_wbuf
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Values of these fields are set during init and never modified. They are
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used (read) in a single function only. There isn't really any reason to
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keep them in a struct. It only makes struct just a bit bigger without
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any visible gain.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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fs/ubifs/io.c | 18 ++++++++++--------
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fs/ubifs/ubifs.h | 5 -----
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2 files changed, 10 insertions(+), 13 deletions(-)
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--- a/fs/ubifs/io.c
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+++ b/fs/ubifs/io.c
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@@ -452,16 +452,22 @@ static enum hrtimer_restart wbuf_timer_c
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*/
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static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
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{
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+ ktime_t softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
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+ unsigned long long delta;
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+
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+ delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
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+ delta *= 1000000000ULL;
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+
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ubifs_assert(!hrtimer_active(&wbuf->timer));
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+ ubifs_assert(delta <= ULONG_MAX);
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if (wbuf->no_timer)
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return;
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dbg_io("set timer for jhead %s, %llu-%llu millisecs",
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dbg_jhead(wbuf->jhead),
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- div_u64(ktime_to_ns(wbuf->softlimit), USEC_PER_SEC),
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- div_u64(ktime_to_ns(wbuf->softlimit) + wbuf->delta,
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- USEC_PER_SEC));
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- hrtimer_start_range_ns(&wbuf->timer, wbuf->softlimit, wbuf->delta,
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+ div_u64(ktime_to_ns(softlimit), USEC_PER_SEC),
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+ div_u64(ktime_to_ns(softlimit) + delta, USEC_PER_SEC));
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+ hrtimer_start_range_ns(&wbuf->timer, softlimit, delta,
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HRTIMER_MODE_REL);
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}
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@@ -1059,10 +1065,6 @@ int ubifs_wbuf_init(struct ubifs_info *c
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hrtimer_init(&wbuf->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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wbuf->timer.function = wbuf_timer_callback_nolock;
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- wbuf->softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
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- wbuf->delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
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- wbuf->delta *= 1000000000ULL;
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- ubifs_assert(wbuf->delta <= ULONG_MAX);
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return 0;
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}
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--- a/fs/ubifs/ubifs.h
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+++ b/fs/ubifs/ubifs.h
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@@ -668,9 +668,6 @@ typedef int (*ubifs_lpt_scan_callback)(s
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* @io_mutex: serializes write-buffer I/O
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* @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
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* fields
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- * @softlimit: soft write-buffer timeout interval
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- * @delta: hard and soft timeouts delta (the timer expire interval is @softlimit
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- * and @softlimit + @delta)
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* @timer: write-buffer timer
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* @no_timer: non-zero if this write-buffer does not have a timer
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* @need_sync: non-zero if the timer expired and the wbuf needs sync'ing
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@@ -699,8 +696,6 @@ struct ubifs_wbuf {
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int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
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struct mutex io_mutex;
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spinlock_t lock;
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- ktime_t softlimit;
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- unsigned long long delta;
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struct hrtimer timer;
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unsigned int no_timer:1;
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unsigned int need_sync:1;
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@ -0,0 +1,66 @@
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From 1b7fc2c0069f3864a3dda15430b7aded31c0bfcc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 20 Sep 2016 10:36:15 +0200
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Subject: [PATCH] ubifs: Use dirty_writeback_interval value for wbuf timer
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Right now wbuf timer has hardcoded timeouts and there is no place for
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manual adjustments. Some projects / cases many need that though. Few
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file systems allow doing that by respecting dirty_writeback_interval
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that can be set using sysctl (dirty_writeback_centisecs).
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Lowering dirty_writeback_interval could be some way of dealing with user
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space apps lacking proper fsyncs. This is definitely *not* a perfect
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solution but we don't have ideal (user space) world. There were already
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advanced discussions on this matter, mostly when ext4 was introduced and
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it wasn't behaving as ext3. Anyway, the final decision was to add some
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hacks to the ext4, as trying to fix whole user space or adding new API
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was pointless.
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We can't (and shouldn't?) just follow ext4. We can't e.g. sync on close
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as this would cause too many commits and flash wearing. On the other
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hand we still should allow some trade-off between -o sync and default
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wbuf timeout. Respecting dirty_writeback_interval should allow some sane
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cutomizations if used warily.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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fs/ubifs/io.c | 8 ++++----
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fs/ubifs/ubifs.h | 4 ----
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2 files changed, 4 insertions(+), 8 deletions(-)
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--- a/fs/ubifs/io.c
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+++ b/fs/ubifs/io.c
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@@ -452,11 +452,11 @@ static enum hrtimer_restart wbuf_timer_c
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*/
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static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
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{
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- ktime_t softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
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- unsigned long long delta;
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+ ktime_t softlimit = ms_to_ktime(dirty_writeback_interval * 10);
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+ unsigned long long delta = dirty_writeback_interval;
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- delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
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- delta *= 1000000000ULL;
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+ /* centi to milli, milli to nano, then 10% */
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+ delta *= 10ULL * NSEC_PER_MSEC / 10ULL;
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ubifs_assert(!hrtimer_active(&wbuf->timer));
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ubifs_assert(delta <= ULONG_MAX);
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--- a/fs/ubifs/ubifs.h
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+++ b/fs/ubifs/ubifs.h
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@@ -106,10 +106,6 @@
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*/
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#define BGT_NAME_PATTERN "ubifs_bgt%d_%d"
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-/* Write-buffer synchronization timeout interval in seconds */
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-#define WBUF_TIMEOUT_SOFTLIMIT 3
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-#define WBUF_TIMEOUT_HARDLIMIT 5
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-
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/* Maximum possible inode number (only 32-bit inodes are supported now) */
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#define MAX_INUM 0xFFFFFFFF
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