libceph: replace ceph_calc_ceph_pg() with ceph_oloc_oid_to_pg()

Switch ceph_calc_ceph_pg() to new oloc and oid abstractions and rename
it to ceph_oloc_oid_to_pg() to make its purpose more clear.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

4 files changed, 30 insertions, 18 deletions

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index 669622fd1ae3..dc66c9e023e4 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -183,6 +183,8 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
         struct ceph_inode_info *ci = ceph_inode(inode);
         struct ceph_osd_client *osdc =
                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
+        struct ceph_object_locator oloc;
+        struct ceph_object_id oid;
         u64 len = 1, olen;
         u64 tmp;
         struct ceph_pg pgid;
@@ -211,8 +213,10 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
                  ceph_ino(inode), dl.object_no);
 
-        r = ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
-                                ceph_file_layout_pg_pool(ci->i_layout));
+        oloc.pool = ceph_file_layout_pg_pool(ci->i_layout);
+        ceph_oid_set_name(&oid, dl.object_name);
+
+        r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid);
         if (r < 0) {
                 up_read(&osdc->map_sem);
                 return r;
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index c85f7d43b861..ebb8ec285de6 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -163,8 +163,11 @@ extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
                                          u64 *bno, u64 *oxoff, u64 *oxlen);
 
 /* calculate mapping of object to a placement group */
-extern int ceph_calc_ceph_pg(struct ceph_pg *pg, const char *oid,
-                          struct ceph_osdmap *osdmap, uint64_t pool);
+extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
+                               struct ceph_object_locator *oloc,
+                               struct ceph_object_id *oid,
+                               struct ceph_pg *pg_out);
+
 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
                                struct ceph_pg pgid,
                                int *acting);
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 2988d68b24c6..10360dedcdad 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1269,8 +1269,8 @@ static int __map_request(struct ceph_osd_client *osdc,
         bool was_paused;
 
         dout("map_request %p tid %lld\n", req, req->r_tid);
-        err = ceph_calc_ceph_pg(&pgid, req->r_oid.name, osdc->osdmap,
-                                req->r_oloc.pool);
+        err = ceph_oloc_oid_to_pg(osdc->osdmap, &req->r_oloc, &req->r_oid,
+                                  &pgid);
         if (err) {
                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
                 return err;
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 8b1a6b48bb5d..768dd04eb9b1 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1090,25 +1090,30 @@ invalid:
 EXPORT_SYMBOL(ceph_calc_file_object_mapping);
 
 /*
- * calculate an object layout (i.e. pgid) from an oid,
- * file_layout, and osdmap
+ * Calculate mapping of a (oloc, oid) pair to a PG.  Should only be
+ * called with target's (oloc, oid), since tiering isn't taken into
+ * account.
  */
-int ceph_calc_ceph_pg(struct ceph_pg *pg, const char *oid,
-                        struct ceph_osdmap *osdmap, uint64_t pool)
+int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
+                        struct ceph_object_locator *oloc,
+                        struct ceph_object_id *oid,
+                        struct ceph_pg *pg_out)
 {
-        struct ceph_pg_pool_info *pool_info;
+        struct ceph_pg_pool_info *pi;
 
-        BUG_ON(!osdmap);
-        pool_info = __lookup_pg_pool(&osdmap->pg_pools, pool);
-        if (!pool_info)
+        pi = __lookup_pg_pool(&osdmap->pg_pools, oloc->pool);
+        if (!pi)
                 return -EIO;
-        pg->pool = pool;
-        pg->seed = ceph_str_hash(pool_info->object_hash, oid, strlen(oid));
 
-        dout("%s '%s' pgid %lld.%x\n", __func__, oid, pg->pool, pg->seed);
+        pg_out->pool = oloc->pool;
+        pg_out->seed = ceph_str_hash(pi->object_hash, oid->name,
+                                     oid->name_len);
+
+        dout("%s '%.*s' pgid %llu.%x\n", __func__, oid->name_len, oid->name,
+             pg_out->pool, pg_out->seed);
         return 0;
 }
-EXPORT_SYMBOL(ceph_calc_ceph_pg);
+EXPORT_SYMBOL(ceph_oloc_oid_to_pg);
 
 static int crush_do_rule_ary(const struct crush_map *map, int ruleno, int x,
                              int *result, int result_max,