[PATCH] dm snapshot: make read and write exception functions void

read_exception() and write_exception() only return an error if supplied with
an out-of-range index.  If this ever happens it's the result of a bug in the
calling code so we handle this with an assertion and remove the error handling
in the callers.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 8b4cd02..002417d 100644 (file)
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -296,42 +296,29 @@ static int write_header(struct pstore *ps)
  */
 static struct disk_exception *get_exception(struct pstore *ps, uint32_t index)
 {
-       if (index >= ps->exceptions_per_area)
-               return NULL;
+       BUG_ON(index >= ps->exceptions_per_area);
 
        return ((struct disk_exception *) ps->area) + index;
 }
 
-static int read_exception(struct pstore *ps,
-                         uint32_t index, struct disk_exception *result)
+static void read_exception(struct pstore *ps,
+                          uint32_t index, struct disk_exception *result)
 {
-       struct disk_exception *e;
-
-       e = get_exception(ps, index);
-       if (!e)
-               return -EINVAL;
+       struct disk_exception *e = get_exception(ps, index);
 
        /* copy it */
        result->old_chunk = le64_to_cpu(e->old_chunk);
        result->new_chunk = le64_to_cpu(e->new_chunk);
-
-       return 0;
 }
 
-static int write_exception(struct pstore *ps,
-                          uint32_t index, struct disk_exception *de)
+static void write_exception(struct pstore *ps,
+                           uint32_t index, struct disk_exception *de)
 {
-       struct disk_exception *e;
-
-       e = get_exception(ps, index);
-       if (!e)
-               return -EINVAL;
+       struct disk_exception *e = get_exception(ps, index);
 
        /* copy it */
        e->old_chunk = cpu_to_le64(de->old_chunk);
        e->new_chunk = cpu_to_le64(de->new_chunk);
-
-       return 0;
 }
 
 /*
@@ -349,10 +336,7 @@ static int insert_exceptions(struct pstore *ps, int *full)
        *full = 1;
 
        for (i = 0; i < ps->exceptions_per_area; i++) {
-               r = read_exception(ps, i, &de);
-
-               if (r)
-                       return r;
+               read_exception(ps, i, &de);
 
                /*
                 * If the new_chunk is pointing at the start of