rbd: rename some fields in struct rbd_dev

An rbd image is not a single object, but a logical construct made up
of an aggregation of objects.

Rename some fields in struct rbd_dev, in hopes of reinforcing this.
    obj         --> image_name
    obj_len     --> image_name_len
    obj_md_name --> header_name

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

1 files changed, 28 insertions, 27 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 03439565c738..7a87a8c3fa34 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -161,9 +161,9 @@ struct rbd_device {
         spinlock_t              lock;           /* queue lock */
 
         struct rbd_image_header header;
-        char                    *obj; /* rbd image name */
-        size_t                  obj_len;
-        char                    *obj_md_name; /* hdr nm. */
+        char                    *image_name;
+        size_t                  image_name_len;
+        char                    *header_name;
         char                    *pool_name;
         int                     pool_id;
 
@@ -1225,8 +1225,8 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
         if (!rbd_dev)
                 return;
 
-        dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", rbd_dev->obj_md_name,
-                notify_id, (int)opcode);
+        dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n",
+                rbd_dev->header_name, notify_id, (int) opcode);
         mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
         rc = __rbd_refresh_header(rbd_dev);
         mutex_unlock(&ctl_mutex);
@@ -1234,7 +1234,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
                 pr_warning(RBD_DRV_NAME "%d got notification but failed to "
                            " update snaps: %d\n", rbd_dev->major, rc);
 
-        rbd_req_sync_notify_ack(rbd_dev, ver, notify_id, rbd_dev->obj_md_name);
+        rbd_req_sync_notify_ack(rbd_dev, ver, notify_id, rbd_dev->header_name);
 }
 
 /*
@@ -1322,7 +1322,7 @@ static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
                 return;
 
         dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n",
-                                rbd_dev->obj_md_name,
+                                rbd_dev->header_name,
                 notify_id, (int)opcode);
 }
 
@@ -1600,7 +1600,7 @@ static int rbd_read_header(struct rbd_device *rbd_dev,
 
                 rc = rbd_req_sync_read(rbd_dev,
                                        NULL, CEPH_NOSNAP,
-                                       rbd_dev->obj_md_name,
+                                       rbd_dev->header_name,
                                        0, len,
                                        (char *)dh, &ver);
                 if (rc < 0)
@@ -1610,7 +1610,8 @@ static int rbd_read_header(struct rbd_device *rbd_dev,
                 if (rc < 0) {
                         if (rc == -ENXIO)
                                 pr_warning("unrecognized header format"
-                                           " for image %s", rbd_dev->obj);
+                                           " for image %s\n",
+                                           rbd_dev->image_name);
                         goto out_dh;
                 }
 
@@ -1666,7 +1667,7 @@ static int rbd_header_add_snap(struct rbd_device *rbd_dev,
         ceph_encode_string_safe(&p, e, snap_name, name_len, bad);
         ceph_encode_64_safe(&p, e, new_snapid, bad);
 
-        ret = rbd_req_sync_exec(rbd_dev, rbd_dev->obj_md_name,
+        ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
                                 "rbd", "snap_add",
                                 data, p - data, &ver);
 
@@ -1874,7 +1875,7 @@ static ssize_t rbd_name_show(struct device *dev,
 {
         struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
 
-        return sprintf(buf, "%s\n", rbd_dev->obj);
+        return sprintf(buf, "%s\n", rbd_dev->image_name);
 }
 
 static ssize_t rbd_snap_show(struct device *dev,
@@ -2178,7 +2179,7 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
         int ret, rc;
 
         do {
-                ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name,
+                ret = rbd_req_sync_watch(rbd_dev, rbd_dev->header_name,
                                          rbd_dev->header.obj_version);
                 if (ret == -ERANGE) {
                         mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
@@ -2341,7 +2342,7 @@ static inline char *dup_token(const char **buf, size_t *lenp)
 }
 
 /*
- * This fills in the pool_name, obj, obj_len, snap_name, obj_len,
+ * This fills in the pool_name, image_name, image_name_len, snap_name,
  * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based
  * on the list of monitor addresses and other options provided via
  * /sys/bus/rbd/add.
@@ -2353,7 +2354,7 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
                               const char **mon_addrs,
                               size_t *mon_addrs_size,
                               char *options,
-                              size_t options_size)
+                             size_t options_size)
 {
         size_t len;
         int ret;
@@ -2377,18 +2378,18 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
         if (!rbd_dev->pool_name)
                 goto out_err;
 
-        rbd_dev->obj = dup_token(&buf, &rbd_dev->obj_len);
-        if (!rbd_dev->obj)
+        rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len);
+        if (!rbd_dev->image_name)
                 goto out_err;
 
         /* Create the name of the header object */
 
-        rbd_dev->obj_md_name = kmalloc(rbd_dev->obj_len
+        rbd_dev->header_name = kmalloc(rbd_dev->image_name_len
                                                 + sizeof (RBD_SUFFIX),
                                         GFP_KERNEL);
-        if (!rbd_dev->obj_md_name)
+        if (!rbd_dev->header_name)
                 goto out_err;
-        sprintf(rbd_dev->obj_md_name, "%s%s", rbd_dev->obj, RBD_SUFFIX);
+        sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX);
 
         /*
          * The snapshot name is optional.  If none is is supplied,
@@ -2412,8 +2413,8 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
         return 0;
 
 out_err:
-        kfree(rbd_dev->obj_md_name);
-        kfree(rbd_dev->obj);
+        kfree(rbd_dev->header_name);
+        kfree(rbd_dev->image_name);
         kfree(rbd_dev->pool_name);
         rbd_dev->pool_name = NULL;
 
@@ -2517,8 +2518,8 @@ err_out_client:
 err_put_id:
         if (rbd_dev->pool_name) {
                 kfree(rbd_dev->snap_name);
-                kfree(rbd_dev->obj_md_name);
-                kfree(rbd_dev->obj);
+                kfree(rbd_dev->header_name);
+                kfree(rbd_dev->image_name);
                 kfree(rbd_dev->pool_name);
         }
         rbd_id_put(rbd_dev);
@@ -2560,7 +2561,7 @@ static void rbd_dev_release(struct device *dev)
                                                     rbd_dev->watch_request);
         }
         if (rbd_dev->watch_event)
-                rbd_req_sync_unwatch(rbd_dev, rbd_dev->obj_md_name);
+                rbd_req_sync_unwatch(rbd_dev, rbd_dev->header_name);
 
         rbd_put_client(rbd_dev);
 
@@ -2570,9 +2571,9 @@ static void rbd_dev_release(struct device *dev)
 
         /* done with the id, and with the rbd_dev */
         kfree(rbd_dev->snap_name);
-        kfree(rbd_dev->obj_md_name);
+        kfree(rbd_dev->header_name);
         kfree(rbd_dev->pool_name);
-        kfree(rbd_dev->obj);
+        kfree(rbd_dev->image_name);
         rbd_id_put(rbd_dev);
         kfree(rbd_dev);
 
@@ -2643,7 +2644,7 @@ static ssize_t rbd_snap_add(struct device *dev,
         mutex_unlock(&ctl_mutex);
 
         /* make a best effort, don't error if failed */
-        rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name);
+        rbd_req_sync_notify(rbd_dev, rbd_dev->header_name);
 
         ret = count;
         kfree(name);