dm snapshot: prepare for switch to using dm-bufio

Change the functions get_exception, read_exception and insert_exceptions
so that ps->area is passed as an argument.

This patch doesn't change any functionality, but it refactors the code
to allow for a cleaner switch over to using dm-bufio.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 14 insertions, 12 deletions

diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 2f5a9f83fc8d..ba792ae068b7 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -402,17 +402,18 @@ static int write_header(struct pstore *ps)
 /*
  * Access functions for the disk exceptions, these do the endian conversions.
  */
-static struct disk_exception *get_exception(struct pstore *ps, uint32_t index)
+static struct disk_exception *get_exception(struct pstore *ps, void *ps_area,
+                                            uint32_t index)
 {
         BUG_ON(index >= ps->exceptions_per_area);
 
-        return ((struct disk_exception *) ps->area) + index;
+        return ((struct disk_exception *) ps_area) + index;
 }
 
-static void read_exception(struct pstore *ps,
+static void read_exception(struct pstore *ps, void *ps_area,
                            uint32_t index, struct core_exception *result)
 {
-        struct disk_exception *de = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, ps_area, index);
 
         /* copy it */
         result->old_chunk = le64_to_cpu(de->old_chunk);
@@ -422,7 +423,7 @@ static void read_exception(struct pstore *ps,
 static void write_exception(struct pstore *ps,
                             uint32_t index, struct core_exception *e)
 {
-        struct disk_exception *de = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, ps->area, index);
 
         /* copy it */
         de->old_chunk = cpu_to_le64(e->old_chunk);
@@ -431,7 +432,7 @@ static void write_exception(struct pstore *ps,
 
 static void clear_exception(struct pstore *ps, uint32_t index)
 {
-        struct disk_exception *de = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, ps->area, index);
 
         /* clear it */
         de->old_chunk = 0;
@@ -443,7 +444,7 @@ static void clear_exception(struct pstore *ps, uint32_t index)
  * 'full' is filled in to indicate if the area has been
  * filled.
  */
-static int insert_exceptions(struct pstore *ps,
+static int insert_exceptions(struct pstore *ps, void *ps_area,
                              int (*callback)(void *callback_context,
                                              chunk_t old, chunk_t new),
                              void *callback_context,
@@ -457,7 +458,7 @@ static int insert_exceptions(struct pstore *ps,
         *full = 1;
 
         for (i = 0; i < ps->exceptions_per_area; i++) {
-                read_exception(ps, i, &e);
+                read_exception(ps, ps_area, i, &e);
 
                 /*
                  * If the new_chunk is pointing at the start of
@@ -504,7 +505,8 @@ static int read_exceptions(struct pstore *ps,
                 if (r)
                         return r;
 
-                r = insert_exceptions(ps, callback, callback_context, &full);
+                r = insert_exceptions(ps, ps->area, callback, callback_context,
+                                      &full);
                 if (r)
                         return r;
         }
@@ -734,7 +736,7 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
                 ps->current_committed = ps->exceptions_per_area;
         }
 
-        read_exception(ps, ps->current_committed - 1, &ce);
+        read_exception(ps, ps->area, ps->current_committed - 1, &ce);
         *last_old_chunk = ce.old_chunk;
         *last_new_chunk = ce.new_chunk;
 
@@ -744,8 +746,8 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
          */
         for (nr_consecutive = 1; nr_consecutive < ps->current_committed;
              nr_consecutive++) {
-                read_exception(ps, ps->current_committed - 1 - nr_consecutive,
-                               &ce);
+                read_exception(ps, ps->area,
+                               ps->current_committed - 1 - nr_consecutive, &ce);
                 if (ce.old_chunk != *last_old_chunk - nr_consecutive ||
                     ce.new_chunk != *last_new_chunk - nr_consecutive)
                         break;