drbd: allow holes in minor and volume id allocation

s/idr_get_new/idr_get_new_above/

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 429fd8d..ea638ce 100644 (file)
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1509,6 +1509,7 @@ extern int is_valid_ar_handle(struct drbd_request *, sector_t);
 
 
 /* drbd_nl.c */
+extern int drbd_msg_put_info(const char *info);
 extern void drbd_suspend_io(struct drbd_conf *mdev);
 extern void drbd_resume_io(struct drbd_conf *mdev);
 extern char *ppsize(char *buf, unsigned long long size);

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 9697ab8..24c712b 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2322,6 +2322,7 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
        struct request_queue *q;
        int vnr_got = vnr;
        int minor_got = minor;
+       enum drbd_ret_code err = ERR_NOMEM;
 
        mdev = minor_to_mdev(minor);
        if (mdev)
@@ -2389,35 +2390,35 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
        INIT_LIST_HEAD(&mdev->current_epoch->list);
        mdev->epochs = 1;
 
-       if (!idr_pre_get(&tconn->volumes, GFP_KERNEL))
-               goto out_no_vol_idr;
-       if (idr_get_new(&tconn->volumes, mdev, &vnr_got))
-               goto out_no_vol_idr;
-       if (vnr_got != vnr) {
-               dev_err(DEV, "vnr_got (%d) != vnr (%d)\n", vnr_got, vnr);
-               goto out_idr_remove_vol;
-       }
-
        if (!idr_pre_get(&minors, GFP_KERNEL))
-               goto out_idr_remove_vol;
-       if (idr_get_new(&minors, mdev, &minor_got))
-               goto out_idr_remove_vol;
+               goto out_no_minor_idr;
+       if (idr_get_new_above(&minors, mdev, minor, &minor_got))
+               goto out_no_minor_idr;
        if (minor_got != minor) {
-               /* minor exists, or other idr strangeness? */
-               dev_err(DEV, "available minor (%d) != requested minor (%d)\n",
-                               minor_got, minor);
+               err = ERR_MINOR_EXISTS;
+               drbd_msg_put_info("requested minor exists already");
                goto out_idr_remove_minor;
        }
+
+       if (!idr_pre_get(&tconn->volumes, GFP_KERNEL))
+               goto out_idr_remove_minor;
+       if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got))
+               goto out_idr_remove_minor;
+       if (vnr_got != vnr) {
+               err = ERR_INVALID_REQUEST;
+               drbd_msg_put_info("requested volume exists already");
+               goto out_idr_remove_vol;
+       }
        add_disk(disk);
 
        return NO_ERROR;
 
-out_idr_remove_minor:
-       idr_remove(&minors, minor_got);
 out_idr_remove_vol:
        idr_remove(&tconn->volumes, vnr_got);
+out_idr_remove_minor:
+       idr_remove(&minors, minor_got);
        synchronize_rcu();
-out_no_vol_idr:
+out_no_minor_idr:
        kfree(mdev->current_epoch);
 out_no_epoch:
        drbd_bm_cleanup(mdev);
@@ -2429,7 +2430,7 @@ out_no_disk:
        blk_cleanup_queue(q);
 out_no_q:
        kfree(mdev);
-       return ERR_NOMEM;
+       return err;
 }
 
 /* counterpart of drbd_new_device.

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index f9be142..f54d512 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -109,7 +109,7 @@ static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
 
 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
  * reason it could fail was no space in skb, and there are 4k available. */
-static int drbd_msg_put_info(const char *info)
+int drbd_msg_put_info(const char *info)
 {
        struct sk_buff *skb = adm_ctx.reply_skb;
        struct nlattr *nla;