close_ioengine() clears ->data after calling engine cleanup

[fio.git] / engines / syslet-rw.c

diff --git a/engines/syslet-rw.c b/engines/syslet-rw.c
index e3be4859503bc9e897c1f7bd29e118f07d0d3734..47610a0cb515e02b02b7350549824a58003ef640 100644 (file)
--- a/engines/syslet-rw.c
+++ b/engines/syslet-rw.c
@@ -14,8 +14,7 @@
 #include <asm/unistd.h>
 
 #include "../fio.h"
-#include "../indirect.h"
-#include "../syslet.h"
+#include "../fls.h"
 
 #ifdef FIO_HAVE_SYSLET
 
@@ -32,6 +31,7 @@ struct syslet_data {
        unsigned int nr_events;
        
        struct syslet_ring *ring;
+       unsigned int ring_mask;
        void *stack;
 };
 
@@ -46,10 +46,13 @@ static void fio_syslet_add_event(struct thread_data *td, struct io_u *io_u)
 static void fio_syslet_add_events(struct thread_data *td, unsigned int nr)
 {
        struct syslet_data *sd = td->io_ops->data;
-       unsigned int i;
+       unsigned int i, uidx;
+
+       uidx = sd->ring->user_tail;
+       read_barrier();
 
        for (i = 0; i < nr; i++) {
-               unsigned int idx = (i + sd->ring->user_tail) % td->o.iodepth;
+               unsigned int idx = (i + uidx) & sd->ring_mask;
                struct syslet_completion *comp = &sd->ring->comp[idx];
                struct io_u *io_u = (struct io_u *) (long) comp->caller_data;
                long ret;
@@ -71,9 +74,7 @@ static void fio_syslet_wait_for_events(struct thread_data *td)
 {
        struct syslet_data *sd = td->io_ops->data;
        struct syslet_ring *ring = sd->ring;
-       unsigned int events;
 
-       events = 0;
        do {
                unsigned int kh = ring->kernel_head;
                int ret;
@@ -85,9 +86,8 @@ static void fio_syslet_wait_for_events(struct thread_data *td)
                        unsigned int nr = kh - ring->user_tail;
 
                        fio_syslet_add_events(td, nr);
-                       events += nr;
                        ring->user_tail = kh;
-                       continue;
+                       break;
                }
 
                /*
@@ -95,25 +95,23 @@ static void fio_syslet_wait_for_events(struct thread_data *td)
                 */
                ret = syscall(__NR_syslet_ring_wait, ring, ring->user_tail);
                assert(!ret);
-       } while (!events);
+       } while (1);
 }
 
-static int fio_syslet_getevents(struct thread_data *td, int min,
-                               int fio_unused max,
+static int fio_syslet_getevents(struct thread_data *td, unsigned int min,
+                               unsigned int fio_unused max,
                                struct timespec fio_unused *t)
 {
        struct syslet_data *sd = td->io_ops->data;
        long ret;
 
-       do {
-               /*
-                * do we have enough immediate completions?
-                */
-               if (sd->nr_events >= (unsigned int) min)
-                       break;
-
+       /*
+        * While we have less events than requested, block waiting for them
+        * (if we have to, there may already be more completed events ready
+        * for us - see fio_syslet_wait_for_events()
+        */
+       while (sd->nr_events < min)
                fio_syslet_wait_for_events(td);
-       } while (1);
 
        ret = sd->nr_events;
        sd->nr_events = 0;
@@ -223,9 +221,7 @@ static void fio_syslet_cleanup(struct thread_data *td)
        if (sd) {
                free(sd->events);
                free(sd->ring);
-               free(sd->stack);
                free(sd);
-               td->io_ops->data = NULL;
        }
 }
 
@@ -245,14 +241,8 @@ static int fio_syslet_init(struct thread_data *td)
         * The ring needs to be a power-of-2, so round it up if we have to
         */
        ring_nr = td->o.iodepth;
-       if (ring_nr & (ring_nr - 1)) {
-               int bits = 1;
-
-               while (ring_nr >>= 1)
-                       bits++;
-
-               ring_nr = 1 << bits;
-       }
+       if (ring_nr & (ring_nr - 1))
+               ring_nr = 1 << fls(ring_nr);
 
        ring_size = sizeof(struct syslet_ring) +
                        ring_nr * sizeof(struct syslet_completion);
@@ -262,6 +252,7 @@ static int fio_syslet_init(struct thread_data *td)
                goto err_mem;
 
        sd->ring = ring;
+       sd->ring_mask = ring_nr - 1;
        sd->stack = stack;
 
        memset(sd->ring, 0, ring_size);