drbd: Implemented new commands to create/delete connections/minors
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner
Родитель
80883197da
Коммит
774b305518
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@ -1258,7 +1258,6 @@ extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev);
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extern void drbd_go_diskless(struct drbd_conf *mdev);
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extern void drbd_ldev_destroy(struct drbd_conf *mdev);
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/* Meta data layout
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We reserve a 128MB Block (4k aligned)
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* either at the end of the backing device
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@ -1476,8 +1475,9 @@ extern wait_queue_head_t drbd_pp_wait;
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extern rwlock_t global_state_lock;
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extern int conn_lowest_minor(struct drbd_tconn *tconn);
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extern struct drbd_conf *drbd_new_device(unsigned int minor);
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enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr);
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extern void drbd_free_mdev(struct drbd_conf *mdev);
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extern void drbd_delete_device(unsigned int minor);
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struct drbd_tconn *drbd_new_tconn(char *name);
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extern void drbd_free_tconn(struct drbd_tconn *tconn);
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@ -614,13 +614,16 @@ char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *tas
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return thi ? thi->name : task->comm;
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}
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#ifdef CONFIG_SMP
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int conn_lowest_minor(struct drbd_tconn *tconn)
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{
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int minor = 0;
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idr_get_next(&tconn->volumes, &minor);
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if (!idr_get_next(&tconn->volumes, &minor))
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return -1;
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return minor;
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}
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#ifdef CONFIG_SMP
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/**
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* drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
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* @mdev: DRBD device.
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@ -2078,15 +2081,16 @@ static void drbd_release_ee_lists(struct drbd_conf *mdev)
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dev_err(DEV, "%d EEs in net list found!\n", rr);
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}
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/* caution. no locking.
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* currently only used from module cleanup code. */
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static void drbd_delete_device(unsigned int minor)
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/* caution. no locking. */
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void drbd_delete_device(unsigned int minor)
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{
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struct drbd_conf *mdev = minor_to_mdev(minor);
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if (!mdev)
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return;
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idr_remove(&mdev->tconn->volumes, minor);
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/* paranoia asserts */
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D_ASSERT(mdev->open_cnt == 0);
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D_ASSERT(list_empty(&mdev->tconn->data.work.q));
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@ -2101,7 +2105,6 @@ static void drbd_delete_device(unsigned int minor)
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bdput(mdev->this_bdev);
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drbd_free_resources(mdev);
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drbd_free_tconn(mdev->tconn);
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drbd_release_ee_lists(mdev);
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@ -2223,6 +2226,9 @@ struct drbd_tconn *drbd_new_tconn(char *name)
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if (!tconn->name)
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goto fail;
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if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL))
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goto fail;
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if (!tl_init(tconn))
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goto fail;
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@ -2252,6 +2258,7 @@ struct drbd_tconn *drbd_new_tconn(char *name)
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fail:
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tl_cleanup(tconn);
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free_cpumask_var(tconn->cpu_mask);
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kfree(tconn->name);
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kfree(tconn);
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@ -2265,6 +2272,7 @@ void drbd_free_tconn(struct drbd_tconn *tconn)
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write_unlock_irq(&global_state_lock);
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idr_destroy(&tconn->volumes);
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free_cpumask_var(tconn->cpu_mask);
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kfree(tconn->name);
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kfree(tconn->int_dig_out);
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kfree(tconn->int_dig_in);
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@ -2272,32 +2280,31 @@ void drbd_free_tconn(struct drbd_tconn *tconn)
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kfree(tconn);
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}
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struct drbd_conf *drbd_new_device(unsigned int minor)
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enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr)
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{
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struct drbd_conf *mdev;
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struct gendisk *disk;
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struct request_queue *q;
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char conn_name[9]; /* drbd1234N */
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int vnr;
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int vnr_got = vnr;
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mdev = minor_to_mdev(minor);
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if (mdev)
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return ERR_MINOR_EXISTS;
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/* GFP_KERNEL, we are outside of all write-out paths */
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mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
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if (!mdev)
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return NULL;
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sprintf(conn_name, "drbd%d", minor);
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mdev->tconn = drbd_new_tconn(conn_name);
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if (!mdev->tconn)
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goto out_no_tconn;
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if (!idr_pre_get(&mdev->tconn->volumes, GFP_KERNEL))
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goto out_no_cpumask;
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if (idr_get_new(&mdev->tconn->volumes, mdev, &vnr))
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goto out_no_cpumask;
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if (vnr != 0) {
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dev_err(DEV, "vnr = %d\n", vnr);
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goto out_no_cpumask;
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return ERR_NOMEM;
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mdev->tconn = tconn;
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if (!idr_pre_get(&tconn->volumes, GFP_KERNEL))
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goto out_no_idr;
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if (idr_get_new(&tconn->volumes, mdev, &vnr_got))
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goto out_no_idr;
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if (vnr_got != vnr) {
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dev_err(DEV, "vnr_got (%d) != vnr (%d)\n", vnr_got, vnr);
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goto out_no_q;
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}
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if (!zalloc_cpumask_var(&mdev->tconn->cpu_mask, GFP_KERNEL))
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goto out_no_cpumask;
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mdev->minor = minor;
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@ -2354,7 +2361,10 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
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INIT_LIST_HEAD(&mdev->current_epoch->list);
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mdev->epochs = 1;
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return mdev;
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minor_table[minor] = mdev;
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add_disk(disk);
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return NO_ERROR;
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/* out_whatever_else:
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kfree(mdev->current_epoch); */
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@ -2367,12 +2377,10 @@ out_no_io_page:
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out_no_disk:
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blk_cleanup_queue(q);
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out_no_q:
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free_cpumask_var(mdev->tconn->cpu_mask);
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out_no_cpumask:
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drbd_free_tconn(mdev->tconn);
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out_no_tconn:
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idr_remove(&tconn->volumes, vnr_got);
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out_no_idr:
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kfree(mdev);
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return NULL;
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return ERR_NOMEM;
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}
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/* counterpart of drbd_new_device.
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@ -443,40 +443,6 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
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return rv;
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}
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static struct drbd_conf *ensure_mdev(int minor, int create)
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{
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struct drbd_conf *mdev;
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if (minor >= minor_count)
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return NULL;
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mdev = minor_to_mdev(minor);
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if (!mdev && create) {
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struct gendisk *disk = NULL;
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mdev = drbd_new_device(minor);
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spin_lock_irq(&drbd_pp_lock);
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if (minor_table[minor] == NULL) {
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minor_table[minor] = mdev;
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disk = mdev->vdisk;
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mdev = NULL;
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} /* else: we lost the race */
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spin_unlock_irq(&drbd_pp_lock);
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if (disk) /* we won the race above */
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/* in case we ever add a drbd_delete_device(),
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* don't forget the del_gendisk! */
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add_disk(disk);
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else /* we lost the race above */
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drbd_free_mdev(mdev);
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mdev = minor_to_mdev(minor);
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}
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return mdev;
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}
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static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
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struct drbd_nl_cfg_reply *reply)
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{
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@ -1789,12 +1755,6 @@ static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *n
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if (!expect(sc.al_extents <= DRBD_AL_EXTENTS_MAX))
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sc.al_extents = DRBD_AL_EXTENTS_MAX;
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/* to avoid spurious errors when configuring minors before configuring
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* the minors they depend on: if necessary, first create the minor we
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* depend on */
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if (sc.after >= 0)
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ensure_mdev(sc.after, 1);
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/* most sanity checks done, try to assign the new sync-after
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* dependency. need to hold the global lock in there,
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* to avoid a race in the dependency loop check. */
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@ -2184,13 +2144,73 @@ out:
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return 0;
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}
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static int drbd_nl_new_conn(struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply)
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{
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struct new_connection args;
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if (!new_connection_from_tags(nlp->tag_list, &args)) {
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reply->ret_code = ERR_MANDATORY_TAG;
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return 0;
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}
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reply->ret_code = NO_ERROR;
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if (!drbd_new_tconn(args.name))
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reply->ret_code = ERR_NOMEM;
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return 0;
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}
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static int drbd_nl_new_minor(struct drbd_tconn *tconn,
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struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply)
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{
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struct new_minor args;
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args.vol_nr = 0;
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args.minor = 0;
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if (!new_minor_from_tags(nlp->tag_list, &args)) {
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reply->ret_code = ERR_MANDATORY_TAG;
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return 0;
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}
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reply->ret_code = conn_new_minor(tconn, args.minor, args.vol_nr);
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return 0;
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}
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static int drbd_nl_del_minor(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
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struct drbd_nl_cfg_reply *reply)
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{
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if (mdev->state.disk == D_DISKLESS &&
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mdev->state.conn == C_STANDALONE &&
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mdev->state.role == R_SECONDARY) {
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drbd_delete_device(mdev_to_minor(mdev));
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reply->ret_code = NO_ERROR;
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} else {
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reply->ret_code = ERR_MINOR_CONFIGURED;
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}
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return 0;
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}
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static int drbd_nl_del_conn(struct drbd_tconn *tconn,
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struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply)
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{
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if (conn_lowest_minor(tconn) < 0) {
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drbd_free_tconn(tconn);
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reply->ret_code = NO_ERROR;
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} else {
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reply->ret_code = ERR_CONN_IN_USE;
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}
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return 0;
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}
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enum cn_handler_type {
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CHT_MINOR,
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CHT_CONN,
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CHT_CTOR,
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/* CHT_RES, later */
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};
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struct cn_handler_struct {
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enum cn_handler_type type;
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union {
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@ -2235,6 +2255,10 @@ static struct cn_handler_struct cnd_table[] = {
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sizeof(struct get_timeout_flag_tag_len_struct)},
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[ P_start_ov ] = { CHT_MINOR, { &drbd_nl_start_ov }, 0 },
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[ P_new_c_uuid ] = { CHT_MINOR, { &drbd_nl_new_c_uuid }, 0 },
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[ P_new_connection ] = { CHT_CTOR, { .constructor = &drbd_nl_new_conn }, 0 },
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[ P_new_minor ] = { CHT_CONN, { .conn_based = &drbd_nl_new_minor }, 0 },
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[ P_del_minor ] = { CHT_MINOR, { &drbd_nl_del_minor }, 0 },
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[ P_del_connection ] = { CHT_CONN, { .conn_based = &drbd_nl_del_conn }, 0 },
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};
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static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
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@ -156,6 +156,9 @@ enum drbd_ret_code {
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ERR_PIC_AFTER_DEP = 156,
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ERR_PIC_PEER_DEP = 157,
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ERR_CONN_NOT_KNOWN = 158,
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ERR_CONN_IN_USE = 159,
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ERR_MINOR_CONFIGURED = 160,
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ERR_MINOR_EXISTS = 161,
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/* insert new ones above this line */
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AFTER_LAST_ERR_CODE
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@ -152,6 +152,18 @@ NL_PACKET(new_c_uuid, 26,
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NL_RESPONSE(return_code_only, 27)
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#endif
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NL_PACKET(new_connection, 28, /* CHT_CTOR */
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NL_STRING( 85, T_MANDATORY, name, DRBD_NL_OBJ_NAME_LEN)
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)
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NL_PACKET(new_minor, 29, /* CHT_CONN */
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NL_INTEGER( 86, T_MANDATORY, minor)
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NL_INTEGER( 87, T_MANDATORY, vol_nr)
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)
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NL_PACKET(del_minor, 30, ) /* CHT_MINOR */
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NL_PACKET(del_connection, 31, ) /* CHT_CONN */
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#undef NL_PACKET
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#undef NL_INTEGER
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#undef NL_INT64
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