rbd: define rbd_dev_v2_header_info()

This rearranges rbd_dev_v2_refresh() so it works more like
rbd_dev_v1_header_info().  While format 1 images need to read the
whole header object to get any information, format 2 can collect
almost all information selectively.  So the one-time initialization
will remain in a separate function--based on rbd_dev_v2_probe().

Rename rbd_dev_v2_refresh() to be rbd_dev_v2_header_info(), and have
it call rbd_dev_v2_header_onetime() if it's being called for the
first time for the given rbd device.

Rename rbd_dev_v2_probe() to be rbd_dev_v2_header_onetime() and
remove the image size and snapshot context calls it held in
common with the refresh function.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6748fe2..0d874a5 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -425,7 +425,8 @@ static void rbd_img_parent_read(struct rbd_obj_request *obj_request);
 static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);
 
 static int rbd_dev_refresh(struct rbd_device *rbd_dev);
-static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev);
+static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev);
+static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev);
 static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
                                        u64 snap_id);
 static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
@@ -3135,7 +3136,7 @@ static int rbd_dev_refresh(struct rbd_device *rbd_dev)
        if (rbd_dev->image_format == 1)
                ret = rbd_dev_v1_header_info(rbd_dev);
        else
-               ret = rbd_dev_v2_refresh(rbd_dev);
+               ret = rbd_dev_v2_header_info(rbd_dev);
 
        /* If it's a mapped snapshot, validate its EXISTS flag */
 
@@ -4005,12 +4006,19 @@ out:
        return snap_name;
 }
 
-static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev)
+static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev)
 {
+       bool first_time = rbd_dev->header.object_prefix == NULL;
        int ret;
 
        down_write(&rbd_dev->header_rwsem);
 
+       if (first_time) {
+               ret = rbd_dev_v2_header_onetime(rbd_dev);
+               if (ret)
+                       goto out;
+       }
+
        ret = rbd_dev_v2_image_size(rbd_dev);
        if (ret)
                goto out;
@@ -4459,22 +4467,18 @@ static void rbd_dev_unprobe(struct rbd_device *rbd_dev)
        memset(header, 0, sizeof (*header));
 }
 
-static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
+static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev)
 {
        int ret;
 
-       ret = rbd_dev_v2_image_size(rbd_dev);
-       if (ret)
-               goto out_err;
-
-       /* Get the object prefix (a.k.a. block_name) for the image */
-
        ret = rbd_dev_v2_object_prefix(rbd_dev);
        if (ret)
                goto out_err;
 
-       /* Get the and check features for the image */
-
+       /*
+        * Get the and check features for the image.  Currently the
+        * features are assumed to never change.
+        */
        ret = rbd_dev_v2_features(rbd_dev);
        if (ret)
                goto out_err;
@@ -4504,17 +4508,7 @@ static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
                if (ret < 0)
                        goto out_err;
        }
-
-       /* crypto and compression type aren't (yet) supported for v2 images */
-
-       rbd_dev->header.crypt_type = 0;
-       rbd_dev->header.comp_type = 0;
-
-       /* Get the snapshot context, plus the header version */
-
-       ret = rbd_dev_v2_snap_context(rbd_dev);
-       if (ret)
-               goto out_err;
+       /* No support for crypto and compression type format 2 images */
 
        return 0;
 out_err:
@@ -4703,7 +4697,7 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool read_only)
        if (rbd_dev->image_format == 1)
                ret = rbd_dev_v1_header_info(rbd_dev);
        else
-               ret = rbd_dev_v2_probe(rbd_dev);
+               ret = rbd_dev_v2_header_info(rbd_dev);
        if (ret)
                goto err_out_watch;