ore: cleanup: Embed an ore_striping_info inside ore_io_state

Now that each ore_io_state covers only a single raid group.
A single striping_info math is needed. Embed one inside
ore_io_state to cache the calculation results and eliminate
an extra call.

Also the outer _prepare_for_striping is removed since it does nothing.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index c1c2cc607adf592f888e67320e1cba58c1474a77..7e02d33b5e5c035fdc68d6ab48419fe272767295 100644 (file)
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -121,11 +121,9 @@ int  ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc,
        ios->offset = offset;
 
        if (length) {
-               struct ore_striping_info si;
-
-               ore_calc_stripe_info(layout, offset, &si);
-               ios->length = (length <= si.group_length) ? length :
-                                                       si.group_length;
+               ore_calc_stripe_info(layout, offset, &ios->si);
+               ios->length = (length <= ios->si.group_length) ? length :
+                                                       ios->si.group_length;
                ios->nr_pages = (ios->length + PAGE_SIZE - 1) / PAGE_SIZE;
        }
 
@@ -416,17 +414,36 @@ static int _add_stripe_unit(struct ore_io_state *ios,  unsigned *cur_pg,
        return 0;
 }
 
-static int _prepare_one_group(struct ore_io_state *ios, u64 length,
-                             struct ore_striping_info *si)
+static int _prepare_for_striping(struct ore_io_state *ios)
 {
+       struct ore_striping_info *si = &ios->si;
        unsigned stripe_unit = ios->layout->stripe_unit;
        unsigned mirrors_p1 = ios->layout->mirrors_p1;
        unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
        unsigned dev = si->dev;
        unsigned first_dev = dev - (dev % devs_in_group);
        unsigned cur_pg = ios->pages_consumed;
+       u64 length = ios->length;
        int ret = 0;
 
+       if (!ios->pages) {
+               if (ios->kern_buff) {
+                       struct ore_per_dev_state *per_dev = &ios->per_dev[0];
+
+                       per_dev->offset = si->obj_offset;
+                       per_dev->dev = si->dev;
+
+                       /* no cross device without page array */
+                       BUG_ON((ios->layout->group_width > 1) &&
+                              (si->unit_off + ios->length >
+                               ios->layout->stripe_unit));
+               }
+               ios->numdevs = ios->layout->mirrors_p1;
+               return 0;
+       }
+
+       BUG_ON(length > si->group_length);
+
        while (length) {
                unsigned comp = dev - first_dev;
                struct ore_per_dev_state *per_dev = &ios->per_dev[comp];
@@ -469,36 +486,6 @@ out:
        return ret;
 }
 
-static int _prepare_for_striping(struct ore_io_state *ios)
-{
-       struct ore_striping_info si;
-       int ret;
-
-       if (!ios->pages) {
-               if (ios->kern_buff) {
-                       struct ore_per_dev_state *per_dev = &ios->per_dev[0];
-
-                       ore_calc_stripe_info(ios->layout, ios->offset, &si);
-                       per_dev->offset = si.obj_offset;
-                       per_dev->dev = si.dev;
-
-                       /* no cross device without page array */
-                       BUG_ON((ios->layout->group_width > 1) &&
-                              (si.unit_off + ios->length >
-                               ios->layout->stripe_unit));
-               }
-               ios->numdevs = ios->layout->mirrors_p1;
-               return 0;
-       }
-
-       ore_calc_stripe_info(ios->layout, ios->offset, &si);
-
-       BUG_ON(ios->length > si.group_length);
-       ret = _prepare_one_group(ios, ios->length, &si);
-
-       return ret;
-}
-
 int ore_create(struct ore_io_state *ios)
 {
        int i, ret;

diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index 8fefdfbb1ced2ecca100022e912e5004ab421c12..baeef0200a1fe102e9f9739d0b19f3874be7d531 100644 (file)
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -93,6 +93,7 @@ typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
 
 struct ore_io_state {
        struct kref             kref;
+       struct ore_striping_info si;
 
        void                    *private;
        ore_io_done_fn  done;