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Subject[PATCH 10/18] drbd: allow holes in minor and volume id allocation
Date
From: Lars Ellenberg <lars.ellenberg@linbit.com>

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>
---
drivers/block/drbd/drbd_int.h | 1 +
drivers/block/drbd/drbd_main.c | 33 +++++++++++++++++----------------
drivers/block/drbd/drbd_nl.c | 2 +-
3 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index acd2877..f4c3c71 100644
--- 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 9b41213..64bf9b6 100644
--- 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)
@@ -2389,33 +2390,33 @@ 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))
+ if (idr_get_new_above(&minors, mdev, minor, &minor_got))
goto out_idr_remove_vol;
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_no_vol_idr;
+ if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got))
+ goto out_no_vol_idr;
+ 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:
kfree(mdev->current_epoch);
@@ -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 a8f27cb..b40c83d 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -133,7 +133,7 @@ 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;
--
1.7.4.1


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