Btrfs: always pin metadata in discard mode

[safe/jmp/linux-2.6] / fs / ubifs / io.c

diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 2d41ae1..762a7d6 100644 (file)
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -297,6 +297,7 @@ static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
 {
        struct ubifs_wbuf *wbuf = container_of(timer, struct ubifs_wbuf, timer);
 
+       dbg_io("jhead %d", wbuf->jhead);
        wbuf->need_sync = 1;
        wbuf->c->need_wbuf_sync = 1;
        ubifs_wake_up_bgt(wbuf->c);
@@ -311,8 +312,12 @@ static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
 {
        ubifs_assert(!hrtimer_active(&wbuf->timer));
 
-       if (!ktime_to_ns(wbuf->softlimit))
+       if (wbuf->no_timer)
                return;
+       dbg_io("set timer for jhead %d, %llu-%llu millisecs", wbuf->jhead,
+              div_u64(ktime_to_ns(wbuf->softlimit), USEC_PER_SEC),
+              div_u64(ktime_to_ns(wbuf->softlimit) + wbuf->delta,
+                      USEC_PER_SEC));
        hrtimer_start_range_ns(&wbuf->timer, wbuf->softlimit, wbuf->delta,
                               HRTIMER_MODE_REL);
 }
@@ -323,11 +328,8 @@ static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
  */
 static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
 {
-       /*
-        * If the syncer is waiting for the lock (from the background thread's
-        * context) and another task is changing write-buffer then the syncing
-        * should be canceled.
-        */
+       if (wbuf->no_timer)
+               return;
        wbuf->need_sync = 0;
        hrtimer_cancel(&wbuf->timer);
 }
@@ -349,8 +351,8 @@ int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
                /* Write-buffer is empty or not seeked */
                return 0;
 
-       dbg_io("LEB %d:%d, %d bytes",
-              wbuf->lnum, wbuf->offs, wbuf->used);
+       dbg_io("LEB %d:%d, %d bytes, jhead %d",
+              wbuf->lnum, wbuf->offs, wbuf->used, wbuf->jhead);
        ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY));
        ubifs_assert(!(wbuf->avail & 7));
        ubifs_assert(wbuf->offs + c->min_io_size <= c->leb_size);
@@ -390,7 +392,7 @@ int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
  * @offs: logical eraseblock offset to seek to
  * @dtype: data type
  *
- * This function targets the write buffer to logical eraseblock @lnum:@offs.
+ * This function targets the write-buffer to logical eraseblock @lnum:@offs.
  * The write-buffer is synchronized if it is not empty. Returns zero in case of
  * success and a negative error code in case of failure.
  */
@@ -399,7 +401,7 @@ int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs,
 {
        const struct ubifs_info *c = wbuf->c;
 
-       dbg_io("LEB %d:%d", lnum, offs);
+       dbg_io("LEB %d:%d, jhead %d", lnum, offs, wbuf->jhead);
        ubifs_assert(lnum >= 0 && lnum < c->leb_cnt);
        ubifs_assert(offs >= 0 && offs <= c->leb_size);
        ubifs_assert(offs % c->min_io_size == 0 && !(offs & 7));
@@ -506,9 +508,9 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
        struct ubifs_info *c = wbuf->c;
        int err, written, n, aligned_len = ALIGN(len, 8), offs;
 
-       dbg_io("%d bytes (%s) to wbuf at LEB %d:%d", len,
-              dbg_ntype(((struct ubifs_ch *)buf)->node_type), wbuf->lnum,
-              wbuf->offs + wbuf->used);
+       dbg_io("%d bytes (%s) to jhead %d wbuf at LEB %d:%d", len,
+              dbg_ntype(((struct ubifs_ch *)buf)->node_type), wbuf->jhead,
+              wbuf->lnum, wbuf->offs + wbuf->used);
        ubifs_assert(len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
        ubifs_assert(wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
        ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
@@ -533,8 +535,8 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
                memcpy(wbuf->buf + wbuf->used, buf, len);
 
                if (aligned_len == wbuf->avail) {
-                       dbg_io("flush wbuf to LEB %d:%d", wbuf->lnum,
-                               wbuf->offs);
+                       dbg_io("flush jhead %d wbuf to LEB %d:%d",
+                              wbuf->jhead, wbuf->lnum, wbuf->offs);
                        err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf,
                                            wbuf->offs, c->min_io_size,
                                            wbuf->dtype);
@@ -562,7 +564,8 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
         * minimal I/O unit. We have to fill and flush write-buffer and switch
         * to the next min. I/O unit.
         */
-       dbg_io("flush wbuf to LEB %d:%d", wbuf->lnum, wbuf->offs);
+       dbg_io("flush jhead %d wbuf to LEB %d:%d",
+              wbuf->jhead, wbuf->lnum, wbuf->offs);
        memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
        err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
                            c->min_io_size, wbuf->dtype);
@@ -695,7 +698,8 @@ int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
        int err, rlen, overlap;
        struct ubifs_ch *ch = buf;
 
-       dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
+       dbg_io("LEB %d:%d, %s, length %d, jhead %d", lnum, offs,
+              dbg_ntype(type), len, wbuf->jhead);
        ubifs_assert(wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
        ubifs_assert(!(offs & 7) && offs < c->leb_size);
        ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);
@@ -819,13 +823,12 @@ out:
  * @c: UBIFS file-system description object
  * @wbuf: write-buffer to initialize
  *
- * This function initializes write buffer. Returns zero in case of success
+ * This function initializes write-buffer. Returns zero in case of success
  * %-ENOMEM in case of failure.
  */
 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)
@@ -851,24 +854,16 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
 
        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 * 1000000000ULL * 2 / 10;
-       if (wbuf->delta > ULONG_MAX)
-               wbuf->delta = ULONG_MAX;
-       wbuf->softlimit = ktime_sub_ns(hardlimit, wbuf->delta);
-       hrtimer_set_expires_range_ns(&wbuf->timer,  wbuf->softlimit,
-                                    wbuf->delta);
+       wbuf->softlimit = ktime_set(WBUF_TIMEOUT_SOFTLIMIT, 0);
+       wbuf->delta = WBUF_TIMEOUT_HARDLIMIT - WBUF_TIMEOUT_SOFTLIMIT;
+       wbuf->delta *= 1000000000ULL;
+       ubifs_assert(wbuf->delta <= ULONG_MAX);
        return 0;
 }
 
 /**
  * ubifs_wbuf_add_ino_nolock - add an inode number into the wbuf inode array.
- * @wbuf: the write-buffer whereto add
+ * @wbuf: the write-buffer where to add
  * @inum: the inode number
  *
  * This function adds an inode number to the inode array of the write-buffer.