libceph: split osdmap allocation and decode steps

Split osdmap allocation and initialization into a separate function,
ceph_osdmap_decode().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 8c8b3ce..46c3e30 100644 (file)
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -156,7 +156,7 @@ static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
        return 0;
 }
 
-extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
+extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
                                            struct ceph_osdmap *map,
                                            struct ceph_messenger *msgr);

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 71830d7..6f64eec 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2062,7 +2062,7 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
                        int skipped_map = 0;
 
                        dout("taking full map %u len %d\n", epoch, maplen);
-                       newmap = osdmap_decode(&p, p+maplen);
+                       newmap = ceph_osdmap_decode(&p, p+maplen);
                        if (IS_ERR(newmap)) {
                                err = PTR_ERR(newmap);
                                goto bad;

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 4dd000d..a82df6e 100644 (file)
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -684,9 +684,8 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 /*
  * decode a full map.
  */
-struct ceph_osdmap *osdmap_decode(void **p, void *end)
+static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
 {
-       struct ceph_osdmap *map;
        u16 version;
        u32 len, max, i;
        int err = -EINVAL;
@@ -694,14 +693,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
        void *start = *p;
        struct ceph_pg_pool_info *pi;
 
-       dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
-
-       map = kzalloc(sizeof(*map), GFP_NOFS);
-       if (map == NULL)
-               return ERR_PTR(-ENOMEM);
-
-       map->pg_temp = RB_ROOT;
-       mutex_init(&map->crush_scratch_mutex);
+       dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
 
        ceph_decode_16_safe(p, end, version, bad);
        if (version > 6) {
@@ -751,7 +743,6 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
        err = osdmap_set_max_osd(map, max);
        if (err < 0)
                goto bad;
-       dout("osdmap_decode max_osd = %d\n", map->max_osd);
 
        /* osds */
        err = -EINVAL;
@@ -819,7 +810,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
        *p = end;
 
        dout("full osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
-       return map;
+       return 0;
 
 bad:
        pr_err("corrupt full osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
@@ -827,8 +818,31 @@ bad:
        print_hex_dump(KERN_DEBUG, "osdmap: ",
                       DUMP_PREFIX_OFFSET, 16, 1,
                       start, end - start, true);
-       ceph_osdmap_destroy(map);
-       return ERR_PTR(err);
+       return err;
+}
+
+/*
+ * Allocate and decode a full map.
+ */
+struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end)
+{
+       struct ceph_osdmap *map;
+       int ret;
+
+       map = kzalloc(sizeof(*map), GFP_NOFS);
+       if (!map)
+               return ERR_PTR(-ENOMEM);
+
+       map->pg_temp = RB_ROOT;
+       mutex_init(&map->crush_scratch_mutex);
+
+       ret = osdmap_decode(p, end, map);
+       if (ret) {
+               ceph_osdmap_destroy(map);
+               return ERR_PTR(ret);
+       }
+
+       return map;
 }
 
 /*
@@ -872,7 +886,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
        if (len > 0) {
                dout("apply_incremental full map len %d, %p to %p\n",
                     len, *p, end);
-               return osdmap_decode(p, min(*p+len, end));
+               return ceph_osdmap_decode(p, min(*p+len, end));
        }
 
        /* new crush? */