diff options
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 4 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 68 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 106 | ||||
| -rw-r--r-- | include/linux/drbd.h | 3 | ||||
| -rw-r--r-- | include/linux/drbd_nl.h | 12 |
5 files changed, 120 insertions, 73 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index a27e2a4e038d..535d503886d8 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1258,7 +1258,6 @@ extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev); extern void drbd_go_diskless(struct drbd_conf *mdev); extern void drbd_ldev_destroy(struct drbd_conf *mdev); - /* Meta data layout We reserve a 128MB Block (4k aligned) * either at the end of the backing device @@ -1476,8 +1475,9 @@ extern wait_queue_head_t drbd_pp_wait; extern rwlock_t global_state_lock; extern int conn_lowest_minor(struct drbd_tconn *tconn); -extern struct drbd_conf *drbd_new_device(unsigned int minor); +enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr); extern void drbd_free_mdev(struct drbd_conf *mdev); +extern void drbd_delete_device(unsigned int minor); struct drbd_tconn *drbd_new_tconn(char *name); extern void drbd_free_tconn(struct drbd_tconn *tconn); diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 2bfd63058f40..ec7d0d98657c 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -614,13 +614,16 @@ char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *tas return thi ? thi->name : task->comm; } -#ifdef CONFIG_SMP int conn_lowest_minor(struct drbd_tconn *tconn) { int minor = 0; - idr_get_next(&tconn->volumes, &minor); + + if (!idr_get_next(&tconn->volumes, &minor)) + return -1; return minor; } + +#ifdef CONFIG_SMP /** * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs * @mdev: DRBD device. @@ -2078,15 +2081,16 @@ static void drbd_release_ee_lists(struct drbd_conf *mdev) dev_err(DEV, "%d EEs in net list found!\n", rr); } -/* caution. no locking. - * currently only used from module cleanup code. */ -static void drbd_delete_device(unsigned int minor) +/* caution. no locking. */ +void drbd_delete_device(unsigned int minor) { struct drbd_conf *mdev = minor_to_mdev(minor); if (!mdev) return; + idr_remove(&mdev->tconn->volumes, minor); + /* paranoia asserts */ D_ASSERT(mdev->open_cnt == 0); D_ASSERT(list_empty(&mdev->tconn->data.work.q)); @@ -2101,7 +2105,6 @@ static void drbd_delete_device(unsigned int minor) bdput(mdev->this_bdev); drbd_free_resources(mdev); - drbd_free_tconn(mdev->tconn); drbd_release_ee_lists(mdev); @@ -2223,6 +2226,9 @@ struct drbd_tconn *drbd_new_tconn(char *name) if (!tconn->name) goto fail; + if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL)) + goto fail; + if (!tl_init(tconn)) goto fail; @@ -2252,6 +2258,7 @@ struct drbd_tconn *drbd_new_tconn(char *name) fail: tl_cleanup(tconn); + free_cpumask_var(tconn->cpu_mask); kfree(tconn->name); kfree(tconn); @@ -2265,6 +2272,7 @@ void drbd_free_tconn(struct drbd_tconn *tconn) write_unlock_irq(&global_state_lock); idr_destroy(&tconn->volumes); + free_cpumask_var(tconn->cpu_mask); kfree(tconn->name); kfree(tconn->int_dig_out); kfree(tconn->int_dig_in); @@ -2272,32 +2280,31 @@ void drbd_free_tconn(struct drbd_tconn *tconn) kfree(tconn); } -struct drbd_conf *drbd_new_device(unsigned int minor) +enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr) { struct drbd_conf *mdev; struct gendisk *disk; struct request_queue *q; - char conn_name[9]; /* drbd1234N */ - int vnr; + int vnr_got = vnr; + + mdev = minor_to_mdev(minor); + if (mdev) + return ERR_MINOR_EXISTS; /* GFP_KERNEL, we are outside of all write-out paths */ mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL); if (!mdev) - return NULL; - sprintf(conn_name, "drbd%d", minor); - mdev->tconn = drbd_new_tconn(conn_name); - if (!mdev->tconn) - goto out_no_tconn; - if (!idr_pre_get(&mdev->tconn->volumes, GFP_KERNEL)) - goto out_no_cpumask; - if (idr_get_new(&mdev->tconn->volumes, mdev, &vnr)) - goto out_no_cpumask; - if (vnr != 0) { - dev_err(DEV, "vnr = %d\n", vnr); - goto out_no_cpumask; - } - if (!zalloc_cpumask_var(&mdev->tconn->cpu_mask, GFP_KERNEL)) - goto out_no_cpumask; + return ERR_NOMEM; + + mdev->tconn = tconn; + if (!idr_pre_get(&tconn->volumes, GFP_KERNEL)) + goto out_no_idr; + if (idr_get_new(&tconn->volumes, mdev, &vnr_got)) + goto out_no_idr; + if (vnr_got != vnr) { + dev_err(DEV, "vnr_got (%d) != vnr (%d)\n", vnr_got, vnr); + goto out_no_q; + } mdev->minor = minor; @@ -2354,7 +2361,10 @@ struct drbd_conf *drbd_new_device(unsigned int minor) INIT_LIST_HEAD(&mdev->current_epoch->list); mdev->epochs = 1; - return mdev; + minor_table[minor] = mdev; + add_disk(disk); + + return NO_ERROR; /* out_whatever_else: kfree(mdev->current_epoch); */ @@ -2367,12 +2377,10 @@ out_no_io_page: out_no_disk: blk_cleanup_queue(q); out_no_q: - free_cpumask_var(mdev->tconn->cpu_mask); -out_no_cpumask: - drbd_free_tconn(mdev->tconn); -out_no_tconn: + idr_remove(&tconn->volumes, vnr_got); +out_no_idr: kfree(mdev); - return NULL; + return ERR_NOMEM; } /* counterpart of drbd_new_device. diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 455a51dd364d..f2739fd188a0 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -443,40 +443,6 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) return rv; } -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) { @@ -1789,12 +1755,6 @@ static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *n if (!expect(sc.al_extents <= DRBD_AL_EXTENTS_MAX)) sc.al_extents = DRBD_AL_EXTENTS_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. */ @@ -2184,13 +2144,73 @@ out: return 0; } +static int drbd_nl_new_conn(struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply) +{ + struct new_connection args; + + if (!new_connection_from_tags(nlp->tag_list, &args)) { + reply->ret_code = ERR_MANDATORY_TAG; + return 0; + } + + reply->ret_code = NO_ERROR; + if (!drbd_new_tconn(args.name)) + reply->ret_code = ERR_NOMEM; + + return 0; +} + +static int drbd_nl_new_minor(struct drbd_tconn *tconn, + struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply) +{ + struct new_minor args; + + args.vol_nr = 0; + args.minor = 0; + + if (!new_minor_from_tags(nlp->tag_list, &args)) { + reply->ret_code = ERR_MANDATORY_TAG; + return 0; + } + + reply->ret_code = conn_new_minor(tconn, args.minor, args.vol_nr); + + return 0; +} + +static int drbd_nl_del_minor(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, + struct drbd_nl_cfg_reply *reply) +{ + if (mdev->state.disk == D_DISKLESS && + mdev->state.conn == C_STANDALONE && + mdev->state.role == R_SECONDARY) { + drbd_delete_device(mdev_to_minor(mdev)); + reply->ret_code = NO_ERROR; + } else { + reply->ret_code = ERR_MINOR_CONFIGURED; + } + return 0; +} + +static int drbd_nl_del_conn(struct drbd_tconn *tconn, + struct drbd_nl_cfg_req *nlp, struct drbd_nl_cfg_reply *reply) +{ + if (conn_lowest_minor(tconn) < 0) { + drbd_free_tconn(tconn); + reply->ret_code = NO_ERROR; + } else { + reply->ret_code = ERR_CONN_IN_USE; + } + + return 0; +} + enum cn_handler_type { CHT_MINOR, CHT_CONN, CHT_CTOR, /* CHT_RES, later */ }; - struct cn_handler_struct { enum cn_handler_type type; union { @@ -2235,6 +2255,10 @@ static struct cn_handler_struct cnd_table[] = { sizeof(struct get_timeout_flag_tag_len_struct)}, [ P_start_ov ] = { CHT_MINOR, { &drbd_nl_start_ov }, 0 }, [ P_new_c_uuid ] = { CHT_MINOR, { &drbd_nl_new_c_uuid }, 0 }, + [ P_new_connection ] = { CHT_CTOR, { .constructor = &drbd_nl_new_conn }, 0 }, + [ P_new_minor ] = { CHT_CONN, { .conn_based = &drbd_nl_new_minor }, 0 }, + [ P_del_minor ] = { CHT_MINOR, { &drbd_nl_del_minor }, 0 }, + [ P_del_connection ] = { CHT_CONN, { .conn_based = &drbd_nl_del_conn }, 0 }, }; static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) diff --git a/include/linux/drbd.h b/include/linux/drbd.h index 7683b4ab6583..e192167e6145 100644 --- a/include/linux/drbd.h +++ b/include/linux/drbd.h @@ -156,6 +156,9 @@ enum drbd_ret_code { ERR_PIC_AFTER_DEP = 156, ERR_PIC_PEER_DEP = 157, ERR_CONN_NOT_KNOWN = 158, + ERR_CONN_IN_USE = 159, + ERR_MINOR_CONFIGURED = 160, + ERR_MINOR_EXISTS = 161, /* insert new ones above this line */ AFTER_LAST_ERR_CODE diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h index ab6159e4fcf0..1216c7a432c5 100644 --- a/include/linux/drbd_nl.h +++ b/include/linux/drbd_nl.h @@ -152,6 +152,18 @@ NL_PACKET(new_c_uuid, 26, NL_RESPONSE(return_code_only, 27) #endif +NL_PACKET(new_connection, 28, /* CHT_CTOR */ + NL_STRING( 85, T_MANDATORY, name, DRBD_NL_OBJ_NAME_LEN) +) + +NL_PACKET(new_minor, 29, /* CHT_CONN */ + NL_INTEGER( 86, T_MANDATORY, minor) + NL_INTEGER( 87, T_MANDATORY, vol_nr) +) + +NL_PACKET(del_minor, 30, ) /* CHT_MINOR */ +NL_PACKET(del_connection, 31, ) /* CHT_CONN */ + #undef NL_PACKET #undef NL_INTEGER #undef NL_INT64 |