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drbd: implicitly create unconfigured devices on sync-after dependencies 

If pacemaker (for example) decided to initialize minor devices not in
the exact sync-after dependency order, the configuration partially
failed with an error "The sync-after minor number is invalid". (Bugz. #322)

We can avoid that by implicitly creating unconfigured minor devices,
if others depend on them.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-09-01 14:39:30 +02:00 committed by Philipp Reisner
parent 3f3a9b849d
commit ef50a3e34f
1 changed files with 41 additions and 35 deletions
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76
drivers/block/drbd/drbd_nl.c
View File

@ -413,6 +413,39 @@ int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
return r;
}
static struct drbd_conf *ensure_mdev(int minor, int create)
{
struct drbd_conf *mdev;
if (minor >= minor_count)
return NULL;
mdev = minor_to_mdev(minor);
if (!mdev && create) {
struct gendisk *disk = NULL;
mdev = drbd_new_device(minor);
spin_lock_irq(&drbd_pp_lock);
if (minor_table[minor] == NULL) {
minor_table[minor] = mdev;
disk = mdev->vdisk;
mdev = NULL;
} /* else: we lost the race */
spin_unlock_irq(&drbd_pp_lock);
if (disk) /* we won the race above */
/* in case we ever add a drbd_delete_device(),
* don't forget the del_gendisk! */
add_disk(disk);
else /* we lost the race above */
drbd_free_mdev(mdev);
mdev = minor_to_mdev(minor);
}
return mdev;
}
static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
@ -1713,6 +1746,12 @@ static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *n
}
#undef AL_MAX
/* to avoid spurious errors when configuring minors before configuring
* the minors they depend on: if necessary, first create the minor we
* depend on */
if (sc.after >= 0)
ensure_mdev(sc.after, 1);
/* most sanity checks done, try to assign the new sync-after
* dependency. need to hold the global lock in there,
* to avoid a race in the dependency loop check. */
@ -2080,40 +2119,6 @@ out:
return 0;
}
static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
{
struct drbd_conf *mdev;
if (nlp->drbd_minor >= minor_count)
return NULL;
mdev = minor_to_mdev(nlp->drbd_minor);
if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
struct gendisk *disk = NULL;
mdev = drbd_new_device(nlp->drbd_minor);
spin_lock_irq(&drbd_pp_lock);
if (minor_table[nlp->drbd_minor] == NULL) {
minor_table[nlp->drbd_minor] = mdev;
disk = mdev->vdisk;
mdev = NULL;
} /* else: we lost the race */
spin_unlock_irq(&drbd_pp_lock);
if (disk) /* we won the race above */
/* in case we ever add a drbd_delete_device(),
* don't forget the del_gendisk! */
add_disk(disk);
else /* we lost the race above */
drbd_free_mdev(mdev);
mdev = minor_to_mdev(nlp->drbd_minor);
}
return mdev;
}
struct cn_handler_struct {
int (*function)(struct drbd_conf *,
struct drbd_nl_cfg_req *,
@ -2174,7 +2179,8 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
goto fail;
}
mdev = ensure_mdev(nlp);
mdev = ensure_mdev(nlp->drbd_minor,
(nlp->flags & DRBD_NL_CREATE_DEVICE));
if (!mdev) {
retcode = ERR_MINOR_INVALID;
goto fail;